阅读说明：本技术 收割机 (Harvester ) 是由 内孝广 西村俊成 丹后芳史 熊取刚 日野真和 崎山洋佑 林翔太 东泷燎平 北村信树 于 2019-03-01 设计创作，主要内容包括：本发明提供一种希望能迅速地进行副变速装置的变速操作的收割机。具备：主变速装置(31)；齿轮切换式的副变速装置(32)；手动式的副变速操作件,指令副变速装置(32)的变速状态的切换；以及变速操作机构(41),基于副变速操作件的操作来切换副变速装置(32)的状态,在变速操作机构(41)具备：操作构件(44),进行副变速装置(32)的变速；以及致动器(CY3),操作操作构件(44)。(The invention provides a harvester which can quickly perform speed change operation of a sub-transmission device. The disclosed device is provided with: a main transmission device (31); a gear switching type sub-transmission device (32); a manual sub-transmission operation member for instructing switching of a transmission state of a sub-transmission device (32); and a shift operation mechanism (41) for switching the state of the sub-transmission (32) based on the operation of the sub-transmission operation member, wherein the shift operation mechanism (41) comprises: an operating member (44) for shifting the sub-transmission device (32); and an actuator (CY3) that operates the operating member (44).)

1. A harvester, characterized by comprising:

a main transmission; a gear switching type sub-transmission; a manual sub-transmission operating member that instructs switching of a transmission state of the sub-transmission; and a shift operation mechanism that switches a state of the sub-transmission based on an operation of the sub-transmission operation member,

the shift operation mechanism includes: an operating member that shifts gears in the sub-transmission; and an actuator that operates the operating member.

2. A harvester according to claim 1,

a transmission case for accommodating the sub-transmission device,

the shift operating mechanism is supported by the transmission case.

3. A harvester according to claim 2,

an operation position detection sensor for detecting an operation position of the operation member,

the operating position detecting sensor and the actuator are supported by a support member supported by the transmission case, respectively.

4. A harvester according to claim 3,

the supporting piece is provided with: a first mounting portion coupled to the transmission case; a second mounting portion to which the actuator is mounted; and a third mounting portion provided at an intermediate portion between the first mounting portion and the second mounting portion, for mounting the operation position detection sensor.

5. A harvester according to claim 3 or 4,

one end portion of the operating member is swingably supported on the sub-transmission,

the actuator is configured to shift the sub-transmission device by being linked to the other end portion of the operating member and swinging the operating member,

the operating position detecting sensor is linked to an intermediate position of a portion of the operating member that is swingably supported and a portion that is coupled to the actuator.

6. A harvester according to any one of claims 1 to 5,

the actuator is disposed above the operating member.

7. A harvester according to any one of claims 1 to 6,

the operating member is supported so as to be vertically swingable about a horizontally oriented axis,

the actuator is constituted by a hydraulic cylinder which is operated to extend and contract in the up-down direction.

8. A harvester, characterized by comprising:

a transmission device having a main transmission device and a gear-switching type multistage sub-transmission device, for shifting power from a drive source and transmitting the power to a traveling device;

a manual sub-transmission operating member that instructs switching of a transmission state of the sub-transmission;

an actuator that operates an operating member that performs shifting in the sub-transmission;

a running state determination unit that determines whether or not the vehicle is in a low-speed running state in which the vehicle speed is lower than a preset set vehicle speed; and

a control unit controlling an operation of the actuator,

the control unit actuates the actuator to switch to a shift state corresponding to a command of the sub-shift operation member when the low-speed travel state is determined by the travel state determination unit, and prohibits the actuation of the actuator regardless of the command of the sub-shift operation member when the low-speed travel state is not determined by the travel state determination unit.

9. A harvester according to claim 8,

the manual main shift operation device is provided for instructing switching of the shift state of the main shift device,

the running state determination unit determines whether or not the low-speed running state is present based on the operation position of the main shift operation member.

10. A harvester according to claim 9,

a neutral range for switching the main transmission device to a neutral state and a travel range for switching the main transmission device to a travel state are set in an operation range of the main shift operation element,

the running state determination unit determines that the vehicle is in the low-speed running state when the main shift operating element is operated to the neutral region, and determines that the vehicle is not in the low-speed running state when the main shift operating element is operated to the running region.

11. A harvester according to any one of claims 8 to 10,

the sub-shift operating member is constituted by a switch that can be pressed,

the harvester is provided with an operation position detection sensor for detecting the operation position of the operation component,

the control unit performs normal operation control of controlling the operation of the actuator to sequentially switch the shift stage of the sub-transmission to a next target shift stage based on detection information of the operation position detection sensor each time the sub-transmission operating member is pressed, and,

when the sub-shift operating element is pressed, the control unit executes abnormal operation control that controls the operation of the actuator based on detection information of the operating position detecting sensor in such a manner that: the actuator is controlled to operate to switch the operating position of the operating member to the original shift stage when the operating position of the operating member is in an operating region that is close to the target shift stage among neutral operating regions between the original shift stage and the target shift stage, and to switch the operating position of the operating member to the target shift stage when the operating position of the operating member is in an operating region that is close to the original shift stage among the neutral operating regions.

12. A harvester according to any one of claims 8 to 10,

the sub-shift operating member is constituted by a switch that can be pressed,

the harvester is provided with an operation position detection sensor for detecting the operation position of the operation component,

the control unit performs normal operation control of controlling the operation of the actuator to sequentially switch the shift stage of the sub-transmission to a next target shift stage based on detection information of the operation position detection sensor each time the sub-transmission operating member is pressed, and,

when it is determined that the shift range is not switched to the target shift range based on the detection information of the operation position detection sensor even if the sub-shift operation member is pressed, the control unit executes abnormal control for controlling the operation of the actuator to switch the operation position of the operation member to the original shift range when the sub-shift operation member is pressed thereafter.

13. A harvester according to claim 11 or 12,

the shift control device further includes a shift notification unit that notifies that the shift speed of the sub-transmission has been switched to the target shift speed.

14. A harvester according to any one of claims 11 to 13,

and an abnormality notification unit configured to notify that the sub-transmission is in an abnormal state when the shift speed of the sub-transmission is not switched to the target shift speed even if the control unit executes the normal operation control.

15. A harvester according to any one of claims 8 to 14,

the engine is provided as a driving source and,

the control unit operates the operating member to one of adjacent shift stages when the operating position of the operating member is between the adjacent shift stages at the time of start of the engine.

16. A harvester according to claim 15,

the control means operates the operating member to one of the gear positions when the operating position of the operating member is located between the adjacent gear positions and is located closer to the one gear position than a center position of the adjacent gear position after the engine is started, and operates the operating member to the other gear position when the operating position of the operating member is located closer to the other gear position than the center position of the adjacent gear position.

17. A harvester is provided with:

a drive source mounted on the body;

a travel transmission device that changes a speed of the power transmitted from the drive source;

an input shaft having an outwardly projecting shaft portion projecting outwardly from the running transmission;

an input rotary body provided on the outwardly projecting shaft portion and to which power is input from the drive source; and

and a power take-out section that takes out power from a region of the input shaft between the input rotating body and the travel transmission device to the outside.

18. A harvester according to claim 17,

the power take-out section includes: a power branching section that branches power from the input shaft; and an output shaft that outputs the power branched by the power branching portion,

the output shaft is provided in a state of extending from the power branching portion toward the travel transmission device.

19. A harvester according to claim 17 or 18,

the power take-out section is provided with a transmission case covering the outer side of each of the power take-out section and the outer protruding shaft section.

20. A harvester according to claim 19,

the transmission case has: a first support portion located on a side close to the travel transmission device; and a second support portion located on a side close to the input rotary member,

the transmission case is supported by the supported portions at the first support portion and the second support portion, respectively.

21. A harvester according to claim 20,

the disclosed device is provided with: left and right travel drive shafts that transmit power after the speed change to the left and right travel devices while protruding outward in the left-right direction from both left and right side portions of the travel transmission device; and

left and right axle boxes covering the left and right travel drive shafts, respectively,

the travel transmission device is configured to be the supported portion corresponding to the first supporting portion, the first supporting portion is supported by the travel transmission device, one of the left and right axle boxes is configured to be the supported portion corresponding to the second supporting portion, and the second supporting portion is supported by the axle box.

22. A harvester according to claim 21,

the first support section is connected to an outer side surface of the travel transmission device in a state of abutting in a left-right direction,

the second support portion is connected to an outer surface of the axle box in a state of abutting in a left-right direction.

23. A harvester according to any one of claims 19 to 22,

a hydraulic pump driven by the power extracted by the power extraction unit,

the hydraulic pump is supported by the transmission case.

Technical Field

The invention relates to a harvester.

Background

(1) Conventionally, there are harvesters such as combine harvesters and corn harvesters that harvest planted crops while running a vehicle body.

In a combine harvester as an example of a harvester, conventionally, there is a transmission device including a gear-switching sub-transmission device in addition to a main transmission device as a transmission device for changing the power of a traveling device in order to travel at a high speed when not operating and travel at a low speed when performing harvesting operation. In addition, conventionally, a sub-transmission device is configured to be switched by manually operating an operating lever that is mechanically coupled (for example, see patent document 1).

(2) In addition, there have been conventional harvesters that harvest planted crops while running a vehicle body, such as combine harvesters and corn harvesters.

In a combine harvester as an example of a harvester, conventionally, there is a transmission device including a gear-switching type multistage sub-transmission in addition to a main transmission as a transmission device for changing the power of a traveling device in order to travel at a high speed when not operating and travel at a low speed when performing harvesting operation. In addition, conventionally, a sub-transmission device is configured to be switched by manually operating an operating lever that is mechanically coupled (for example, see patent document 1).

(3) In addition, there have been conventional harvesters such as combine harvesters and corn harvesters, and more specifically, there are harvesters including a drive source mounted on a machine body and a travel transmission device for changing the speed of power transmitted from the drive source.

Conventionally, a transmission is configured such that power from an engine as a drive source is transmitted to a transmission as a travel transmission device via an input pulley as an input rotating body. The engine is disposed at a low position inside the machine body, the transmission is disposed at a position lower than a lateral center portion of the machine body and in a state of being located in a middle of the left and right traveling devices, and the input pulley is disposed at a lateral side of the transmission in a state of being close to the transmission (for example, see patent document 2).

Disclosure of Invention

Problems to be solved by the invention

(1) The technical problem corresponding to the background art (1) is as follows.

In the above-described conventional configuration, the sub-shift operation needs to be performed by manually operating the operating lever, and the switching operation takes time, which makes it difficult to cope with a case where the shift state is to be switched quickly. For example, when the harvesting work is performed in a state where the sub-transmission is set to a low speed, and when the harvesting work is temporarily ended but the traveling to another position is required, the operation can be efficiently performed by switching the sub-transmission to a high speed during the traveling.

Therefore, it is desirable that the harvester can quickly perform the shifting operation of the sub-transmission.

(2) The technical problem corresponding to the background art (2) is as follows.

In the above-described conventional configuration, the sub-shift operation needs to be performed by manually operating the operating lever, and the switching operation takes time, which makes it difficult to cope with a case where the shift state is to be switched quickly. For example, when the harvesting work is performed in a state where the sub-transmission is set to a low speed, and when the harvesting work is temporarily ended but the traveling to another position is required, the operation can be efficiently performed by switching the sub-transmission to a high speed during the traveling.

In order to quickly perform a shift operation of the sub-transmission device, it is conceivable to employ a configuration in which the sub-transmission operation is performed by an actuator. However, a gear-shift type sub-transmission is a device that shifts gears to bring different gears into mesh and shifts gears to a plurality of shift stages. When a gear shift type sub-transmission device such as this is directly operated by an actuator instead of a manual operation type operation structure, there is a possibility that the switching operation to a different gear position cannot be performed satisfactorily.

Therefore, it is desirable that the gear shift type sub-transmission device can perform a switching operation to different gear positions quickly and satisfactorily by the actuator.

(3) The technical problem corresponding to the background art (3) is as follows.

In a harvester such as a combine harvester, it is desired to increase the size of a crop processing device such as a threshing device mounted on a machine body to improve the work efficiency.

In some cases, when the crop processing apparatus is increased in size, there is no space for providing a drive source (engine) at a low position inside the machine body, and the drive source must be provided at a high position above the crop processing apparatus, a position at the rear side of the machine body of the crop processing apparatus, or the like. On the other hand, in order to distribute and transmit power to the left and right traveling devices, a traveling transmission device such as a transmission needs to be disposed in a state of being located in the middle of the left and right traveling devices.

Since the conventional structure is configured such that the engine is disposed at a low position in the body and power is transmitted to the transmission case by using the empty region of the center-side lower portion of the body, when the threshing device is enlarged to improve the work efficiency as described above, the arrangement of the drive source is restricted because there is no empty region in the center-side lower portion of the body, and for example, power transmission by bypassing the power from the drive source to the outside in the lateral direction of the body of the crop processing device is required, and the transmission structure of the conventional structure cannot be directly applied.

Therefore, it is desirable to transmit power to the travel transmission even when the arrangement of the drive source is restricted, and to effectively utilize the transmitted power.

Means for solving the problems

(1) The solution corresponding to the technical problem (1) is as follows.

The harvester of the present invention is characterized by comprising: a main transmission; a gear switching type sub-transmission; a manual sub-transmission operating member that instructs switching of a transmission state of the sub-transmission; and a shift operation mechanism that switches a state of the sub-transmission device based on an operation of the sub-transmission operation member, the shift operation mechanism including: an operating member that shifts gears in the sub-transmission; and an actuator that operates the operating member.

According to the present invention, the shift of the sub-transmission is performed by operating the operating member by the actuator, and therefore, a switching operation can be performed more quickly than a switching operation of the operating member by a manual operation. Therefore, the shift operation of the sub-transmission device can be performed quickly.

In the present invention, it is preferable that a transmission case accommodating the sub-transmission device is provided, and the shift operation mechanism is supported by the transmission case.

According to this structure, the transmission housing the subtransmission device and the other transmission mechanism is a high-rigidity and high-strength transmission. The shift operating mechanism can be stably supported by the highly rigid transmission.

In the present invention, it is preferable that an operation position detection sensor for detecting an operation position of the operation member is provided, and the operation position detection sensor and the actuator are supported by a support supported by the transmission.

According to this configuration, the actuator is operated while the operation position of the operation member is detected by the operation position detection sensor, whereby the switching operation by the actuator can be performed favorably. Further, the actuator and the operation position detection sensor can be stably supported on the transmission case via the support member.

In the present invention, it is preferable that the support member is provided with: a first mounting portion coupled to the transmission case; a second mounting portion to which the actuator is mounted; and a third mounting portion provided at an intermediate portion between the first mounting portion and the second mounting portion, for mounting the operation position detection sensor.

According to this structure, the first mounting portion of the support member is coupled to and supported by the transmission case. Since the actuator is mounted at a position away from the coupling portion of the transmission case, the actuator as a relatively large-sized device can be easily and smoothly installed. An operation position detection sensor as a small-sized device can be provided in a stable state with less malfunction at a position close to a portion coupled to a transmission.

In the present invention, it is preferable that one end portion of the operating member is swingably supported by the sub-transmission, the actuator is configured to be linked to the other end portion of the operating member and to swing the operating member to shift the sub-transmission, and the operating position detecting sensor is linked to an intermediate position between a portion of the operating member that is swingably supported and a portion that is coupled to the actuator.

According to the present structure, the actuator is linked to the other end portion of the operating member, i.e., a position away from the portion supported by swinging, so that the actuator can move and operate the operating member with as small an operating force as possible. The operating position detecting sensor can be disposed by utilizing an empty region between a portion where the operating member is swingably supported on the sub-transmission and a portion where the actuator is provided. As a result, the entire shift operation mechanism can be provided in a compact shape.

In the present invention, it is preferable that the actuator is disposed in a state of being located above the operating member.

According to this configuration, since the actuator is provided at a high position above the operating member coupled to the sub-transmission device, the actuator is located at a position distant from the traveling road surface. As a result, the actuator is less likely to be contaminated by soil or the like scattered and deposited during harvesting operation or to be in contact with a field surface having large irregularities, and can be used favorably for a long period of time.

In the present invention, it is preferable that the operating member is supported so as to be vertically swingable about a horizontally oriented axis, and the actuator is constituted by a hydraulic cylinder which is vertically operated to extend and contract.

According to this configuration, since the hydraulic cylinder is vertically extended and contracted with respect to the vertically swinging operation member, the operation force can be efficiently transmitted to the operation member, and the hydraulic cylinder can be compactly arranged in a region having a narrow width in the lateral direction.

(2) The solution corresponding to the technical problem (2) is as follows.

The harvester of the present invention is characterized by comprising: a transmission device having a main transmission device and a gear-switching type multistage sub-transmission device, for shifting power from a drive source and transmitting the power to a traveling device; a manual sub-transmission operating member that instructs switching of a transmission state of the sub-transmission; an actuator that operates an operating member that performs shifting in the sub-transmission; a running state determination unit that determines whether or not the vehicle is in a low-speed running state in which the vehicle speed is lower than a preset set vehicle speed; and a control unit that controls an operation of the actuator, wherein when the low-speed travel state is determined by the travel state determination unit, the control unit operates the actuator to switch to a shift state corresponding to a command of the sub-shift operation member, and when the low-speed travel state is not determined by the travel state determination unit, the control unit prohibits the operation of the actuator regardless of the command of the sub-shift operation member.

According to the present invention, when the sub-transmission operating element is manually operated, the actuator operating member shifts to shift the speed of the sub-transmission device, as long as the running state determining means determines that the sub-transmission device is in the low-speed running state in which the vehicle speed is lower than the set vehicle speed. Compared to a transmission in which an operating member is switched by a manual operation, a quick switching operation can be performed. The set vehicle speed is set to a small value substantially close to zero.

However, if the running state determination means does not determine that the vehicle is in the low-speed running state, the actuator does not operate even if the sub-shift operation is manually operated. When the harvester runs at a speed higher than the set vehicle speed, even if the sub-transmission operating element is operated by mistake, the actuator does not work, so that the gear can be prevented from shifting and the gear can be forced to engage with the rotating gear.

Therefore, in the sub-transmission of the gear switching type, the switching operation to different gear positions can be performed quickly and satisfactorily by the actuator.

In the present invention, it is preferable that a manual main shift operating element is provided that instructs switching of a shift state of the main shift device, and the traveling state determination means determines whether or not the low-speed traveling state is present based on an operation position of the main shift operating element.

According to this configuration, the main transmission device is a device that mainly changes the speed of the power transmitted from the drive source to the traveling device, and contributes greatly to the variation of the vehicle speed. The main transmission determines a shifting state by manual operation of a main shift operating member. Therefore, the operation position of the main shift operation element corresponds to the vehicle speed, and therefore, the low-speed travel state can be determined based on the operation position of the main shift operation element. As a result, for example, the low-speed travel state can be determined with a simple configuration as compared with a case where the actual rotation state of the rotating body (transmission shaft, gear, etc.) in the transmission mechanism is detected.

In the present invention, it is preferable that a neutral region for switching the main transmission device to a neutral state and a travel region for switching the main transmission device to a travel state are set in an operation region of the main shift operation element, the travel state determination means determines that the vehicle is in the low-speed travel state when the main shift operation element is operated to the neutral region, and the travel state determination means determines that the vehicle is not in the low-speed travel state when the main shift operation element is operated to the travel region.

According to this configuration, the main shift operating element can be operated along the operating region having the neutral region and the traveling region, and the traveling state determination means determines that the vehicle is in the low-speed traveling state when the main shift operating element is located in the neutral region, and determines that the vehicle is not in the low-speed traveling state when the main shift operating element is located in the traveling region.

That is, the traveling state determination means can be configured to determine whether or not the main shift operation element is located in the neutral region, and can cope with this without arranging the detection range over the entire operation region with a simple configuration.

In the present invention, it is preferable that the sub-transmission operating element is constituted by one switch which can be pressed, the harvester includes an operating position detection sensor which detects an operating position of the operating member, the control unit executes normal operation control which controls operation of the actuator to sequentially switch the gear shift stage of the sub-transmission to a next target gear shift stage based on detection information of the operating position detection sensor every time the sub-transmission operating element is pressed, and when the sub-transmission operating element is pressed, the control unit executes abnormal operation control which controls operation of the actuator based on detection information of the operating position detection sensor as follows: the actuator is controlled to operate to switch the operating position of the operating member to the original shift stage when the operating position of the operating member is in an operating region that is close to the target shift stage among neutral operating regions between the original shift stage and the target shift stage, and to switch the operating position of the operating member to the target shift stage when the operating position of the operating member is in an operating region that is close to the original shift stage among the neutral operating regions.

According to this configuration, the control unit executes the normal operation control each time the sub-shift operating element constituted by one switch is pressed. In this normal operation control, the operation of the actuator is controlled while the operation position of the operation member is detected and fed back by the operation position detection sensor, so that the operation member can be moved to an appropriate position corresponding to the next target gear position.

However, even if the shift is performed by operating the operating member, the operating member may not reach the target shift speed but may be located in a neutral operating region between the original shift speed and the target shift speed if the gears are not engaged well. In this case, the control unit executes the control for abnormality.

That is, when the operating position of the operating member is located in an operating region that is close to the target shift stage among the neutral operating regions between the original shift stage and the target shift stage when the sub-shift operating member is operated thereafter, the operation of the actuator is controlled to switch the operating position of the operating member to the original shift stage. When the operating position of the operating member is located in an operating region that is close to the original gear shift stage among the neutral operating regions, the actuator is controlled to switch the operating position of the operating member to the target gear shift stage.

Even if the shift is performed from the original gear to the target gear in the previous shift operation, for example, the shift gear may stay at a position close to the gear corresponding to the target gear if the gears are not engaged well. Further, it is considered that, when the shift is not performed satisfactorily, even if the sub-transmission operation element is operated again to shift the gear from the target gear to the original gear, the gears are not engaged satisfactorily. In this case, the shift gear is considered to be retained at a position close to the gear corresponding to the original speed change stage.

Therefore, it is assumed that: the shift to the original shift stage is performed when the operating member is located in the operating region near the target shift stage, and the shift to the target shift stage is performed when the operating member is located in the operating region near the original shift stage. It is important to move the operating member to the speed change stage on the meshing side before the shift is performed. As a result, the gears can return to the original meshing state, and a good meshing state is obtained. In this case, it is considered that the engagement is difficult even if the shift is repeated toward the gear position on the side where the engagement is not performed well, and therefore, it is possible to take measures such as changing the rotational phase of the gear by transmitting the power in the engaged state and performing the sub-shift operation again.

In the present invention, it is preferable that the sub-shift operating member is constituted by one switch which can be pressed, the harvester is provided with an operation position detection sensor for detecting the operation position of the operation member, and each time the auxiliary speed change operation member is pressed, the control unit performs normal operation control of controlling the operation of the actuator to sequentially switch the shift stage of the sub-transmission to a next target shift stage based on detection information of the operation position detection sensor, and, when it is determined that the shift speed is not shifted to the target shift speed based on the detection information of the operation position detection sensor even if the sub-shift operation member is pressed, the control unit executes control for abnormality that controls operation of the actuator to switch the operation position of the operating member to the original shift stage when the sub-shift operating element is pressed thereafter.

According to this configuration, the control unit executes the normal operation control each time the sub-shift operating element constituted by one switch is pressed. In this normal operation control, the operation of the actuator is controlled while the operation position of the operation member is detected and fed back by the operation position detection sensor, so that the operation member can be moved to an appropriate position corresponding to the next target gear position.

However, even if the shift is performed by operating the operating member, the operating member may not reach the target shift speed but may be located in a neutral operating region between the original shift speed and the target shift speed if the gears are not engaged well. In this case, the control unit executes the control for abnormality.

That is, when the sub-shift operating member is operated again, the operation of the actuator is controlled to switch to the original shift stage even if the operating member has not reached the target shift stage in the previous operation. As a result, the operating member is moved to the gear position on the meshing side before shifting, and the gears can be restored to the original meshing state, and a good meshing state is obtained. In this case, it is considered that the engagement is difficult even if the shift operation to move the shift gear to the target gear position is repeated, and therefore, it is possible to take a measure such as changing the rotational phase of the gear by transmitting power in a state where the original gear position is engaged, and performing the sub-shift operation again.

In the present invention, it is preferable that a switching notification means be provided for notifying that the shift speed of the sub-transmission has been switched to the target shift speed.

According to the present configuration, when the control unit executes the normal operation control to operate the actuator to switch the operating member from the position corresponding to the original gear position to the position corresponding to the target gear position, the switch notification unit notifies that when it is determined that the operating member has been switched to the position corresponding to the target gear position based on the detection result of the operated position detection sensor.

Since the driver presses only one sub-transmission operation member, it is difficult to confirm the actual switching state of the sub-transmission. Therefore, by executing the notification processing by the switching notification unit, it is possible to easily confirm that the sub-transmission has switched to the target gear shift stage.

In the present invention, it is preferable that: and an abnormality notification unit that notifies that the sub-transmission is in an abnormal state when the shift speed of the sub-transmission is not switched to the target shift speed even if the control unit executes the normal operation control.

According to this configuration, the abnormality notification unit notifies that the shift position is in the abnormal state when the sub-transmission operating element is operated and the target shift stage is not shifted due to, for example, the gear being shifted not being well engaged. As a result, the driver can quickly recognize that the vehicle is in the abnormal state, and can immediately take countermeasures.

In the present invention, it is preferable that an engine as a driving source is provided, and the control means operates the operating member to one of adjacent gear positions when the operating position of the operating member is located between the adjacent gear positions at the time of starting the engine.

According to this configuration, when the engine is started to start the work performed by the harvester, the operating member is operated to one of the adjacent gear shift stages when the operating member is located between the adjacent gear shift stages for some reason and is not switched to a position corresponding to any one of the gear shift stages.

In a state where the engine is stopped, for example, in a case where the vehicle is transported by a truck, even if the vehicle is displaced from a position corresponding to a gear position when the operating member is moved due to vibration of the vehicle body or the power supply to the engine is stopped and the position holding by the actuator is not possible, the vehicle can start traveling by moving the position of the operating member after the engine is started to exhibit a good engagement state.

In the present invention, it is preferable that the control means operates the operating member to the one gear position when the operating position of the operating member is located between the adjacent gear positions and at a position closer to the one gear position than a center position of the adjacent gear position after the engine is started, and operates the operating member to the other gear position when the operating position of the operating member is located at a position closer to the other gear position than the center position of the adjacent gear position.

According to this configuration, when the operating member is not switched to a position corresponding to any one of the adjacent gear shift stages at the time of start of the engine, the operating member is moved to a gear shift stage that is closer to the operating member among the adjacent gear shift stages.

In the case where the operation member is displaced for some reason, it is considered that the operation member is not largely displaced from the original engagement position. Therefore, the gear can be returned to the original meshing state by operating the operating member to a gear position closer to the operating member among the adjacent gear positions and moving the operating member to the previously meshed gear position. Further, the vehicle can start traveling with a good engagement state.

(3) The solution corresponding to the technical problem (3) is as follows.

The harvester of the present invention is characterized by comprising: a drive source mounted on the body; a travel transmission device that changes a speed of the power transmitted from the drive source; an input shaft having an outwardly projecting shaft portion projecting outwardly from the running transmission; an input rotary body provided on the outwardly projecting shaft portion and to which power is input from the drive source; and a power take-out section that takes out power from a region of the input shaft between the input rotating body and the travel transmission device to the outside.

In a harvester, the arrangement of a driving source is restricted, and for example, the driving source is arranged at a high position above a crop processing device such as a threshing device, at a rear side of the crop processing device, or the like, and power from the driving source is transmitted in a state of bypassing a lateral outer portion of a machine body. Even in such a case, according to this configuration, the power can be received satisfactorily by the input rotary member provided in the outwardly projecting shaft portion projecting outwardly from the running transmission, and the power transmitted to the input rotary member is transmitted to the running transmission.

The power take-out section is provided in a region of the input shaft between the input rotating body and the travel transmission device, and the power taken out to the outside through the power take-out section can be transmitted to another device. In this way, the structure of the outwardly projecting shaft portion projecting outwardly from the running transmission can be effectively utilized to drive other devices.

Therefore, even when the arrangement of the drive source is restricted, the power can be transmitted to the running transmission, and the transmitted power can be effectively used.

In the present invention, it is preferable that the power take-out portion includes: a power branching section that branches power from the input shaft; and an output shaft that outputs the power branched by the power branching portion, the output shaft being provided in a state of extending from the power branching portion toward the travel transmission device.

According to this configuration, the power branched by the power branching portion can be output to the external device via the output shaft. Since the output shaft extends from the power branching portion toward the travel transmission device, the region between the input rotating body and the travel transmission device can be effectively used so that the output shaft does not protrude further toward the opposite side of the travel transmission device than the input rotating body, and power can be output in a compact shape.

In the present invention, it is preferable that: and a transmission case covering the outer sides of the power take-out section and the outer protruding shaft section.

According to this configuration, since the outer sides of the power take-out portion and the outer projecting shaft portion are covered with the transmission case, it is possible to avoid disadvantages such as a reduction in durability due to scattering of dirt, dust, and the like generated in association with harvesting work to the power take-out portion and the outer projecting shaft portion, and to maintain a good transmission state for a long period of time.

In the present invention, it is preferable that the transmission case has: a first support portion located on a side close to the travel transmission device; and a second support portion located on a side close to the input rotary member, and the transmission case is supported by the supported portions at the first support portion and the second support portion, respectively.

According to this structure, the side of the transmission case closer to the travel transmission and the side closer to the input rotary body are supported by the supported portions, respectively. Therefore, the transmission case extending in the lateral direction to cover both the power take-out portion and the outwardly projecting shaft portion can be stably supported by both side portions in the longitudinal direction in a state of being supported at both ends.

In the present invention, it is preferable that: left and right travel drive shafts that transmit power after the speed change to the left and right travel devices while protruding outward in the left-right direction from both left and right side portions of the travel transmission device; and left and right axle boxes that cover the left and right travel drive shafts, respectively, wherein the travel transmission device is set to the supported portion corresponding to the first support portion, the first support portion is supported by the travel transmission device, one of the left and right axle boxes is set to the supported portion corresponding to the second support portion, and the second support portion is supported by the axle box.

According to this configuration, the right and left travel drive shafts for transmitting the power, which is shifted in the travel transmission, to the right and left travel devices are covered with the axle boxes, respectively. The travel transmission device is a structure having a large rigidity, and includes a mechanism for changing the speed of power transmitted from a drive source. The axle boxes also have a large rigidity in order to support the left and right traveling devices on the machine body. Therefore, in the present configuration, the transmission case can be supported firmly by the running gear and the axle box having a strong structure.

In the present invention, it is preferable that the first support portion is connected to an outer surface of the travel transmission device in a state of being in contact with the first support portion in the left-right direction, and the second support portion is connected to an outer surface of the axle box in a state of being in contact with the second support portion in the left-right direction.

According to this configuration, one side of the transmission case is connected to the outer side surface of the travel transmission device in a state of contact, and the other side is connected to the outer side surface of the axle box in a state of contact. That is, the transmission case is connected to the travel transmission device at a position different from a connection position with the axle box.

As a result, the travel transmission device, the axle box, and the transmission case are connected and fixed in a frame state, and therefore, for example, the support strength for supporting the left and right travel devices to the machine body can be increased as compared with a structure in which these are connected in a laterally juxtaposed state.

In the present invention, it is preferable that a hydraulic pump driven by the power extracted by the power extraction unit is provided, and the hydraulic pump is supported by the transmission case.

According to this configuration, the hydraulic pump is driven by the power extracted from the power extraction unit, and the hydraulic oil is supplied from the hydraulic pump to the other hydraulic devices. Since the lubricating oil is stored inside the travel transmission, the oil can be used as the working oil. Since the hydraulic pump is supported by the transmission case located at a position close to the travel transmission device, the hydraulic pump can be disposed at a position close to the oil reservoir to smoothly supply the hydraulic oil. Further, the hydraulic pump can be supported by a simple structure by effectively using the transmission case without providing a special support member.

Drawings

Fig. 1 is a view showing a first embodiment (hereinafter, the same applies to fig. 15), and is an overall side view of a combine harvester.

Fig. 2 is an overall plan view of the combine harvester.

Fig. 3 is a rear view showing the main shift lever.

Fig. 4 is a rear view of the shift operating mechanism.

Fig. 5 is a simplified configuration diagram of the subtransmission device.

Fig. 6 is a diagram showing operation mechanisms of the subtransmission device and the main transmission device.

Fig. 7 is a plan view of the cab.

Fig. 8 is a sectional rear view showing a tilting state of the grain box.

Fig. 9 is a top view of the console.

Fig. 10 is a control block diagram.

Fig. 11 is a flowchart of the control operation.

Fig. 12 is a flowchart of the control operation.

Fig. 13 is a flowchart of the control operation.

Fig. 14 is a plan view showing an operation state.

Fig. 15 is a flowchart of a control operation according to another embodiment.

Fig. 16 is a view showing a second embodiment (hereinafter, the same as fig. 25), and is an overall right side view of the combine harvester.

Fig. 17 is an overall left side view of the combine harvester.

Fig. 18 is a top view of the combine.

Fig. 19 is a plan view showing a body support structure.

Fig. 20 is a perspective view showing a body support structure.

Fig. 21 is a left side view showing a transmission structure on the left side of the body.

Fig. 22 is a right side view showing a transmission structure on the right side of the body.

FIG. 23 is a driveline diagram.

Fig. 24 is a partially cut-away front view showing a transmission structure for front wheels.

Fig. 25 is a vertical cross-sectional side view of the hydraulic pump arrangement unit.

Detailed Description

< first embodiment >

Embodiments of the present invention will be described based on the drawings. In the following description, the direction of arrow F is referred to as the "front side" (see fig. 1 and 2), the direction of arrow B is referred to as the "rear side" (see fig. 1 and 2), the direction of arrow L is referred to as the "left side" (see fig. 2), and the direction of arrow R is referred to as the "right side" (see fig. 2).

[ integral structure of combine harvester ]

A general type combine harvester is shown in fig. 1 as an example of the harvester. The combine includes a traveling machine body 1 having a pair of left and right front wheels 2 and a pair of left and right rear wheels 3 as traveling devices. The front wheels 2 are configured to be drivable by power from an engine 4. The rear wheels 3 are configured to be capable of steering operation. The traveling machine body 1 includes a driving unit 5 at its front portion. The cab 5 is covered with a cab 6. A harvesting and conveying part 8 is arranged at the front part of the machine body frame 7. The harvesting conveyor 8 includes a harvesting unit 9 as an example of a harvesting unit for harvesting the planted straw and a straw conveyor 10 for conveying the harvested straw rearward. The harvesting unit 9 includes a rotary drum 11 for raking the planted vertical straw rearward, a harvesting knife 12 for cutting the root of the planted vertical straw, an auger 13 for collecting the harvested straw in the harvesting width direction, and the like.

The traveling machine body 1 includes, at a rear portion thereof: a threshing device 14 for threshing the harvested grain stalks transported by the grain stalk transport device 10. The grain and straw conveying device 10 is connected to the front part of the threshing device 14 so as to be swingable up and down about a horizontal axis P1. As shown in fig. 2, the threshing device 14 is placed on the machine body frame 7 in a state of being offset to the left lateral side of the traveling machine body 1 with respect to the center in the lateral width direction of the traveling machine body 1, and is supported by the machine body frame 7 in a fixed state. The threshing device 14 is provided with: a grain tank 15 for storing grains obtained by the threshing process.

The entire harvesting conveyor 8 including the straw conveyor 10 and the harvesting unit 9 is configured to be swingably lifted and lowered about a lateral axis P1 by a harvesting lifting/lowering hydraulic cylinder (hereinafter, simply referred to as a harvesting lifting/lowering cylinder) CY 1. The harvesting conveyor 8 is operated to swing and lift by the harvesting lift cylinder CY1, whereby the harvesting unit 9 can be operated to move up and down between an operating state in which it is lowered near the ground and a non-operating state in which it is raised to a high position from the ground.

The rotary drum 11 is supported by the frame of the harvesting unit 9 so as to be movable up and down about a rear transverse axis P2. A rotary drum lifting hydraulic cylinder CY2 (hereinafter, simply referred to as a drum lifting cylinder) is provided between the front-rear intermediate portion of the rotary drum 11 and the frame portion of the harvesting portion 9. The height of the rotary drum 11 can be changed and adjusted by the operation of the drum lift cylinder CY 2.

[ grain case 15 ]

The grain discharging device 18 is provided for discharging grains stored in the grain box 15 to the outside of the body. The discharge auger 19 is rotatably disposed at the right lateral end side in the lateral width direction of the travel machine body 1 in the bottom of the grain tank 15. A connection box 20 is connected to the front portion of the grain box 15 in communication with a position corresponding to the discharge screw conveyor 19.

As shown in fig. 1 and 2, a grain discharging device 18 capable of conveying grains to the outside of the machine body via a connecting box 20 is connected to the discharge screw conveyor 19. The grain discharge device 18 includes: a screw conveyor type vertical conveying section 18A for conveying grains upward from the end of the discharge screw conveyor 19; and a screw conveyor type horizontal conveying part 18B for conveying grains horizontally from the upper end of the vertical conveying part 18A. The grain discharging device 18 can convey grains by being rotationally driven by a not-shown hydraulic motor, and the hydraulic motor can be switched to an operating state by a switching operation of a not-shown discharge switch.

In the grain discharging device 18, the entire grain discharging device 18 can be rotationally operated between the storage posture (posture shown by a solid line in fig. 2) and the discharge posture (posture shown by a phantom line in fig. 2) with the rotation axis P3 of the vertical conveying section 18A oriented in the vertical direction as the rotation center by the telescopic operation of the rotation hydraulic cylinder CY4 (hereinafter, simply referred to as a rotation cylinder).

The grain bin 15 is configured to: in addition to the grain discharge method by the grain discharge device 18, the whole grain box 15 can be tilted about the rotation axis of the discharge screw conveyor 19, and the stored grains can be directly discharged to the outside from the right side. That is, as shown in fig. 8, the right lateral portion of the grain box 15 is largely opened to form the discharge port 22. The discharge port 22 is formed in a state of opening to the right lateral outside of the travel machine body 1, and a right side wall 23 of the grain tank 15 closing the discharge port 22 is provided so as to be swingable open and closed around the longitudinal axis of the lower end.

As shown in fig. 8, the grain tank 15 is supported by the body frame 7 so as to be relatively rotatable about an axial center P4 of the discharge screw conveyor 19 toward the rotation support shaft 19 a. A tilt hydraulic cylinder (hereinafter, simply referred to as tilt cylinder) CY5 is pivotally connected between the lower portion of the grain tank 15 and the machine body frame 7. The grain tank 15 is configured to be pivotable about an axis P4 by the telescopic operation of the tilt cylinder CY5, and is configured to be switched between a storage posture (posture shown by a phantom line in fig. 8) and an inclined discharge posture (posture shown by a solid line in fig. 8).

An opening 15a is formed in the bottom surface of the grain tank 15 above the discharge screw 19, and the opening 15a is configured to be switchable between a closed state and an open state by an openable/closable shutter 25. Further, although not shown, a link mechanism is provided that links the right side wall 23 to the open state in conjunction with the switching of the posture of the grain tank 15 from the storage posture to the discharge posture.

When the grain tank 15 is switched to the discharge position with the shutter 25 closed, the right side wall 23 is opened to discharge grains from the discharge port 22 as shown in fig. 8. The grain tank 15 is provided with a vertical wall 26 for restricting the flow rate of grains during discharge. The right side wall 23 is formed in a groove shape having a wall surface portion at the front-rear center and front-rear surfaces at both front-rear sides, and serves as a chute for guiding grains to flow down when the groove is opened. When the grain discharging device 18 is driven to discharge the grains to the outside, the shutter 25 needs to be switched to the open state.

The tilt control device is provided with a pivot switch 27 for commanding the operation of the pivot cylinder CY4 and a tilt switch 28 for commanding the operation of the tilt cylinder CY5 (see fig. 10). Although not shown, the tilt switch 28 is provided in the driver section 5 in an operable state.

[ Transmission structure for traveling ]

The traveling machine body 1 includes an engine 4 as a drive source and a transmission device 30 for shifting power of the engine 4 and transmitting the power to the front wheels 2. The transmission 30 has a main transmission 31 provided with a hydrostatic continuously variable transmission (HST) and a gear-switching sub-transmission 32. The main transmission device 31 switches the power from the engine 4 to forward power and reverse power and continuously shifts the rotational speeds of the forward power and the reverse power.

The subtransmission device 32 is accommodated in a transmission case 33 provided between the left and right front wheels 2. The subtransmission device 32 is configured in a gear switching type of a known structure. That is, as shown in fig. 5, the sub-transmission 32 is a device that switches the shifting state by sliding the shift gear 35, which is fitted to the input shaft 34 in an integrally rotating state by splines, in the axial direction of the input shaft 34. When the shift gear 35 is switched to a state of meshing with the interlocking gear 37 in the low-speed gear mechanism 36, the low-speed state is switched to a state of transmitting power to the output shaft 38 via the low-speed gear mechanism 36. When the shift gear 35 is switched to a position where it meshes with the interlocking gear 40 in the high-speed gear mechanism 39, it is switched to a high-speed state in which power is transmitted to the output shaft 38 via the high-speed gear mechanism 39. When the shift gear 35 is not engaged with the interlocking gears 37 and 40, the neutral state is switched to a neutral state in which power transmission is not performed. The low-speed operation position and the high-speed operation position are disposed on the left and right sides of the housing so as to sandwich the neutral position. That is, the sub-transmission 32 can be switched to two stages, i.e., a high speed state and a low speed state, which are a plurality of gear shift stages.

[ sub-transmission operation structure ]

Next, a shift operation structure of the sub-transmission 32 will be explained.

As shown in fig. 4, 5, and 6, the shift operating mechanism 41 for switching the state of the sub-transmission 32 is provided. The sub-transmission 32 is configured to be switched by an operation of a shift cylinder CY3 (hereinafter simply referred to as a shift cylinder) without a manual operation. That is, the shift operation mechanism 41 includes a shift cylinder CY3 as an actuator.

As shown in fig. 4 and 6, the shift operating mechanism 41 is supported by the transmission case 33 in a state of being located on the rear side of the transmission case 33. As shown in fig. 5, the shift fork 42 that engages with the shift gear 35 of the sub-transmission 32 to perform a shift operation is supported on a front-rear rotating shaft 43 so as to be rotatable integrally with the rotating shaft 43, and the rotating shaft 43 is rotatably supported on the transmission case 33. The rotation shaft 43 is exposed rearward and outward from the transmission case 33, and one end portion of a sub-transmission arm 44 having a plate shape, which is an operation member for shifting gears, extending in the left-right direction is integrally rotatably attached to the exposed portion.

A piston rod 46 of the shift cylinder CY3 is coupled to the other end of the sub-shift arm 44 via a coupling member 45. The shift cylinder CY3 is disposed in a state of being located above the sub-transmission arm 44 and in a posture in which the longitudinal direction is in the up-down direction.

The shift cylinder CY3 extends and contracts in the vertical direction, and the sub-transmission arm 44 is swingable about the axial center P5 of the rotating shaft 43 to switch between the high speed position Hi located on the upper side (the state shown by the solid line in fig. 4) and the low speed position Lo located on the lower side (the state shown by the phantom line in fig. 4).

The shift operation mechanism 41 is provided with an operation position detection sensor 47 that detects an operation position of the sub-shift arm 44. The operation position detection sensor 47 is constituted by a potentiometer, and can output a detection value corresponding to the swing angle of the sensing arm 47 a. The swing end of the sensing arm 47a and the intermediate position of the sub-transmission arm 44 are linked via a linking member 47 b. Therefore, the operation position detection sensor 47 outputs a detection value corresponding to the vertical swing amount of the sub-transmission arm 44.

As shown in fig. 4 and 6, the shift cylinder CY3 and the operating position detecting sensor 47 are supported by the support member 48. The support 48 is formed of a plate body having a substantially L-shape in plan view.

A first mounting portion 49 of the stay 48, which is formed of a left and right facing surface portion positioned at a lower portion, is bolted to a support portion 50 on the transmission case 33 side having a left and right facing mounting surface. The second mounting portion 51 of the stay 48, which is formed by the upper front-rear facing surface portion, is bolted to a pair of front and rear plate surfaces of the coupling member 52 of the shift cylinder CY3 in a state of being sandwiched therebetween. The stay 48 includes a substantially U-shaped base portion 53 at an intermediate portion between the first attachment portion 49 and the second attachment portion 51 in the vertical direction in plan view, and the operation position detection sensor 47 is bolted to a third attachment portion 54 of the base portion 53, which is formed of attachment surfaces facing in the front-rear direction. Therefore, the operating position detecting sensor 47 and the shift cylinder CY3 are supported by the support member 48 supported by the transmission case 33, respectively.

As shown in fig. 4 and 6, an operating coupling mechanism 55 for main shift operation is supported on the transmission case 33. A tubular member 58 extending in the left-right direction is supported by a support member 56 coupled to the right side of the transmission case 33 and a support member 57 coupled to the left side of the upper portion of the transmission case 33 in a state of being fastened together with the stay 48. A relay shaft 59 is rotatably supported inside the cylindrical member 58. A first swing arm 61 linked to the main shift lever 60 is provided at one end of the relay shaft 59, and a second swing arm 63 linked to an operating element 62 of the main transmission device 31 is provided at the other end of the relay shaft 59.

(operation structure of driver's part)

As shown in fig. 7, the driver unit 5 includes a console 65 in front of the driver seat 64, and a steering wheel 66 above the console 65. By rotating the steering wheel 66, the rear wheels 3 are steered by a power steering device, not shown.

An operation panel portion 67 is provided on the right lateral side of the driver seat 64. The operation panel unit 67 includes: a main shift lever 60 that performs a shift operation of the main shift device 31 as a manual main shift operation member; a harvesting clutch lever 68; a threshing clutch lever 69; an engine information display operation unit 70 that displays information related to the engine 4 and performs an operation related to the information; and a work information display operation unit 71 and the like for displaying information related to harvesting work and performing an operation related to the information.

The main shift lever 60 is swung in the front-rear direction of the machine body, and the main transmission 31 is shifted. As shown in fig. 6, the main shift lever 60 is connected to the first swing arm 61, and a neutral region NA for switching the main shift device 31 to the neutral state and a traveling region SA for switching the main shift device 31 to the traveling state are provided in the operation region of the main shift lever 60. As the running range SA, a forward running range SA1 is set on the front side of the neutral range NA, and a reverse running range SA2 is set on the rear side of the neutral range NA.

The main shift lever 60 swings forward from the neutral range NA, and is operated forward in the forward travel range SA1, whereby the forward travel speed is increased steplessly. The main shift lever 60 swings rearward from the neutral region NA, and the rearward traveling speed is increased steplessly as it is operated rearward in the rearward traveling region SA 2.

As shown in fig. 6, a neutral switch 72, which is an example of a traveling state determining means for detecting whether or not the main shift lever 60 is located in the neutral region NA, is provided in the vicinity of the main shift lever 60. The neutral switch 72 is configured to: the on state is established when the main shift lever 60 is located in the neutral region, and the off state is established when the main shift lever 60 is located in the forward running region SA1 or the reverse running region SA 2. That is, the neutral switch 72 is turned on when the main shift lever 60 is operated to the neutral region NA, and thus can be determined to be in the low-speed travel state in which the vehicle speed is lower than the preset set vehicle speed, and the neutral switch 72 is turned off when the main shift lever 60 is located in the forward travel region SA1 or the reverse travel region SA2, and thus can be determined not to be in the low-speed travel state.

As shown in fig. 3, the main shift lever 60 includes a grip portion 60A and a shaft portion 60B.

The shaft portion 60B extends downwardly from the grip portion 60A and is coupled to the linkage bar 60C. A sub-shift switch 73 and a harvest lift switch 74, which are manual sub-shift operation members, are provided on the left lateral side of the grip portion 60A of the main shift lever 60, and a reel lift switch 75 is provided on the front surface portion of the grip portion 60A. The sub-shift switch 73, the harvest lift switch 74, and the reel lift switch 75 can be operated by finger operation of the hand holding the main shift lever 60.

The sub-transmission 32 can be operated to shift gears by operating the sub-transmission switch 73. The sub-transmission switch 73 is a push-operated switch that is turned on only during a push operation and is turned off when the push operation is released. The harvesting unit 9 can be raised and lowered by operating the harvesting lift switch 74, and the rotary drum 11 can be raised and lowered by operating the drum lift switch 75. The harvest lift switch 74 and the reel lift switch 75 are of a two-position switching type, and the driver can easily recognize which operation is the raising operation or the lowering operation.

The reaping clutch lever 68 can connect/disconnect a reaping clutch (not shown) that switches on/off the power transmission from the engine 4 to the reaping portion 9 by a swing operation in the front-rear direction. The threshing clutch lever 69 can also be operated to connect/disconnect a threshing clutch (not shown) that connects/disconnects power transmission from the engine 4 to each part of the threshing device 14 by swinging in the front-rear direction.

As shown in fig. 9, a sub-shift display unit 76 that displays the shift state of the sub-shift device 32 is provided on the console 65. The sub-shift operation is performed by the pressing operation of the sub-shift switch 73, and therefore it is difficult for the driver to know which shift position is actually located. Therefore, the sub-shift display unit 76 includes two display lamps 76a and 76 b. Is configured to: when the first indicator light 76a is turned on, it indicates that the sub-transmission 32 is switched to a high-speed state (for traveling); when the second indicator lamp 76b is turned on, it indicates that the sub-transmission 32 is switched to the low speed state (for harvesting work).

A key switch 78 for starting or stopping the engine 4, turning on/off power supply to various electric components, and the like is provided on the upper portion of the console 65.

As the elevation operation of the harvesting unit 9, in addition to the elevation operation by the manual operation of the harvesting elevation switch 74, automatic elevation control for automatic elevation is performed so that the height of the harvesting unit 9 with respect to the ground is maintained at a target height during the harvesting operation. A ground-following type harvesting height sensor (not shown) is provided at a lower portion of the harvesting unit 9, and a target height setting device is provided at the operation panel 67. Further, a control device 79 (see fig. 10) is provided for controlling the operation of the harvesting cylinder CY1 so that the detected height reaches the target height. In the automatic elevation control, the operation speed when the harvesting unit 9 is lowered is set to be lower than that in the manual lowering operation.

[ control structure ]

Next, a control structure will be explained. As shown in fig. 10, the harvester lift cylinder CY1, the reel lift cylinder CY2, the shift cylinder CY3, the turning cylinder CY4, and the tilt cylinder CY5 are provided with a control device 79 as control means for controlling the operations of the respective cylinders. The control device 79 is configured to be provided with a microcomputer and performs control according to a preset control program.

The control device 79 receives information from each of the harvesting elevation switch 74, the reel elevation switch 75, the sub-transmission switch 73, the rotation switch 27, the tilt switch 28, the neutral switch 72, and the operation position detection sensor 47. Hydraulic control valves are provided so as to correspond to the respective hydraulic cylinders. Specifically, the present invention includes a first switching valve V1 for the harvesting lift cylinder CY1, a second switching valve V2 for the reel lift cylinder CY2, a third switching valve V3 for the shift cylinder CY3, a fourth switching valve V4 for the rotation cylinder CY4, and a fifth switching valve V5 for the tilt cylinder CY 5.

The control device 79 is configured to electrically switch and control the first to fifth switching valves V1 to V5 based on input information of the switches, respectively, to control the operations of the hydraulic cylinders. The control device 79 also controls the operation of the two indicator lights 76a and 76b and the buzzer 80 that performs notification operation in the sub-transmission display portion 76.

Among the five hydraulic control valves described above, the first switching valve V1, the second switching valve V2, and the third switching valve V3 are integrally assembled as one valve assembly VU1 (first valve assembly), and the fourth switching valve V4 and the fifth switching valve V5 are integrally assembled as the other valve assembly VU2 (second valve assembly).

As shown in fig. 1 and 2, the first valve assembly VU1 is supported by the cab support frame 81 in the cab 5 in the front-rear direction toward the front of the frame body 82.

The first valve assembly VU1 is provided below the floor of the cab 5, and supports the floor of the cab 5 from below in the front-rear direction toward the frame 82. Instead of supporting the first valve unit VU1 on the front-rear frame 82 in this manner, the first valve unit VU1 may be supported on a frame body of the cab support frame 81 that is different from the front-rear frame 82. On the other hand, the second valve assembly VU2 is supported by a lower portion of the longitudinal frame body 83 located on the rear side of the engine 4 and extending in the up-down direction. By thus dividing the valve assembly into two and disposing both of them at positions close to the target hydraulic cylinder, the hydraulic piping becomes shorter and the piping structure becomes simple.

The supply state of the hydraulic oil is controlled such that a harvesting lift cylinder CY1, a reel lift cylinder CY2, a turning cylinder CY4, and a tilt cylinder CY5 among the plurality of hydraulic cylinders extend or retract in accordance with the operation of corresponding switches.

The following describes operation control of the shift cylinder CY3 for performing a shifting operation of the subtransmission device 32.

As shown in fig. 11, when the engine 4 is started by the operation of the key switch 78 and the control is started by the supply of electric power, it is determined whether or not the shift gear 35 in the sub-transmission 32 is in a neutral state in which it is not reliably engaged in either a high speed state or a low speed state (step 1).

Further, as shown in fig. 4, a neutral operation region NW having a predetermined width on both sides about a center position NL between the high speed position Hi and the low speed position Lo in the operation region of the sub-shift arm 44 is set. The following hidden troubles exist: in the neutral operation region NW, the shift gear 35 is not reliably engaged in the high speed position or the low speed position. Therefore, it is determined whether or not the position of the sub-transmission arm 44 is in the neutral operation region NW (neutral state) based on the detection result of the operation position detection sensor 47.

When the sub-transmission arm 44 is positioned in the neutral operation region NW, the first indicator lamp 76a and the second indicator lamp 76b in the sub-transmission display unit 76 are both blinked and displayed, and the driver is notified of the abnormal state (step 2) and performs the return process of switching the shift gear 35 to the state in which it is reliably engaged at both the high speed and the low speed (step 3). Therefore, the two indicator lights 76a and 76b of the subtransmission display portion 76 correspond to the abnormality notification means.

That is, as shown in fig. 12, it is determined whether the sub-transmission arm 44 is located on the low speed side or the high speed side from the center position NL between the high speed position Hi and the low speed position Lo in the neutral operation region NW (step 31). When it is determined that the sub-transmission arm 44 is located on the low speed side of the center position NL, the shift cylinder CY3 is operated to move the sub-transmission arm 44 to the low speed side (step 32). When it is determined that the sub-transmission arm 44 is positioned on the high speed side from the center position NL (the sub-transmission arm 44 is not positioned on the low speed side from the center position NL), the shift cylinder CY3 is operated to move the sub-transmission arm 44 to the high speed side (step 33). By executing such a return process, the sub-transmission arm 44 is moved out of the neutral operation region NW, and the shift gear 35 is reliably engaged at both high and low speeds.

Next, the indicator lamp (the first indicator lamp 76a or the second indicator lamp 76b) corresponding to the side to be switched at this time in the sub-transmission display portion 76 is turned on and displayed (step 4). When the sub-transmission switch 73 is turned on, it is determined whether the main transmission device 31 is in a neutral state at this time, that is, whether the neutral switch 72 is in an on state or an off state (steps 5 and 6). When it is determined that the neutral switch 72 is in the off state, the operation of the transmission cylinder CY3 is not performed regardless of the operation of the sub-transmission switch 73 (steps 6 and 14). That is, the operation of the transmission cylinder CY3 is prohibited.

When the sub-transmission switch 73 is turned on and it is determined that the neutral switch 72 is in the on state (steps 5 and 6), the sub-transmission arm 44 is not located in the neutral operation region NW but located in the high speed position Hi, and the transmission cylinder CY3 is operated to switch to the low speed position Lo (steps 7, 8 and 9). When it is detected that the sub-transmission arm 44 has been switched to the low speed position Lo, the buzzer 80 is sounded for a short time to notify the driver of this (steps 10, 11). At this time, the high speed position Hi corresponds to the original gear position, and the low speed position Lo corresponds to the target gear position.

When the sub-shift switch 73 is turned on, if the sub-shift arm 44 is not located in the neutral operation region NW but located in the low speed position Lo, the shift cylinder CY3 is operated to switch to the high speed position Hi (steps 8 and 12). When it is detected that the sub-transmission arm 44 has been switched to the high speed position Hi, the buzzer 80 is sounded for a short time to notify the driver of the fact (steps 13, 11). At this time, the low speed position Lo corresponds to the original gear position, and the high speed position Hi corresponds to the target gear position. Therefore, the buzzer 80 corresponds to a switch notification unit that notifies that the shift speed of the subtransmission device 32 has been switched to the target shift speed.

Thereafter, as long as the key switch 78 is not turned off, the corresponding indicator lamp (the first indicator lamp 76a or the second indicator lamp 76b) in the sub-shift display unit 76 is turned on and displayed, and waits until the sub-shift switch 73 is operated next time (steps 14, 4, and 5).

When the buzzer 80 does not sound even if the sub-transmission switch 73 is turned on and switching cannot be confirmed, it is considered that the shift gear 35 is not properly engaged and rebounds. In this case, when the driver operates the sub-shift switch 73 again, the sub-shift arm 44 is positioned in the neutral operation region NW at this time. Therefore, in such a case, the first display lamp 76a and the second display lamp 76b are displayed in a blinking state together, the driver is notified of the abnormal state (steps 7 and 15), and the following abnormal process (step 16) as the control for the abnormality is executed.

That is, as shown in fig. 13, when the sub-transmission arm 44 is positioned closer to the low speed position Lo in the neutral operation region NW, the transmission cylinder CY3 is operated to move the sub-transmission arm 44 to the high speed position Hi (steps 41 and 42). When the position of the sub-transmission arm 44 is a position close to the high speed position Hi in the neutral operation region NW (not a position close to the low speed position Lo), the transmission cylinder CY3 is operated to move to the low speed position Lo (step 43). That is, the speed change state in which the shift gear 35 is engaged before the speed change operation is returned, thereby returning to the appropriate engagement state. Then, the switching operation is appropriately performed. If the engine 4 is not started again after the engine 4 is stopped, the return process of step 3 is executed, and the shift gear 35 can be returned to the engaged state before the shift operation by operating the engine 4 to the opposite side of the case of step 16.

According to the above configuration, since the sub-transmission 32 is switched by the operation of the shift cylinder CY3 in accordance with the operation of the sub-transmission switch 73, the switching operation of the sub-transmission 32 can be performed quickly and efficiently. As a result, there are advantages as described below.

In a combine harvester, for example, as shown in fig. 14, the following operation method may be adopted: the harvesting work is performed on one end side of the non-harvesting region MR where the grain stalks are planted, the vehicle body is temporarily stopped at a first stop position Q1 after the harvesting of the working path is completed, and then the vehicle body is reversed while switching the direction to the next crossing working path and stopped at a second stop position Q2, and further the vehicle body is advanced to perform the harvesting work along the next working path.

The harvesting work along the working path is performed by setting the sub-transmission 32 to a low speed state, but when the vehicle body is moved backward at a high speed at the time of direction change, the working efficiency is improved. Therefore, when the running is stopped at the first stop position Q1, the main transmission device 31 is switched to the neutral state, and at this time, the subtransmission switch 73 can be operated to quickly switch the subtransmission device 32 from the low speed state to the high speed state. In addition, at the second stop position Q2, the sub-transmission 32 can be quickly switched from the high speed state to the low speed state again by the operation of the sub-transmission switch 73, and the harvesting work can be performed.

[ other embodiments ]

(1) In the above embodiment, the operating position detection sensor 47 and the shift cylinder CY3 are supported by the stay 48 supported by the transmission case 33, but the operating position detection sensor 47 and the shift cylinder CY3 may be supported by the transmission case 33 separately, and the operating position detection sensor 47 and the shift cylinder CY3 may be supported by the body frame 7 without being limited to the transmission case 33.

(2) In the above embodiment, although the operation position detection sensor 47 is constituted by a potentiometer, the position may be detected by a contact switch such as a limit switch, or the following configuration may be adopted without providing the operation position detection sensor 47: the operation of the shift cylinder CY3 is managed in time, or a buffer spring is provided between the shift cylinder CY3 and the operating member (sub-shift arm 44), and even if the gears are not yet engaged, they are automatically engaged when the shaft starts to rotate.

(3) Instead of the above embodiment, the following processing may be executed as the control for abnormality when the shift is not performed satisfactorily even if the sub-shift switch 73 is turned on.

That is, as shown in fig. 15, when the previous command given by the operation of the sub-shift switch 73 is the switching operation from the high speed position Hi to the low speed position Lo, the shift cylinder CY3 is operated to move to the high speed position Hi (steps 51 and 52). When the previous command is the switching operation from the low speed position Lo to the high speed position Hi, the shift cylinder CY3 is operated to move to the low speed position Lo (step 53). By this control, it is possible to return to the speed change state in which the shift gear 35 is engaged before being operated to change the speed, and to return to the appropriate engagement state.

(4) In the above embodiment, the actuator is constituted by the hydraulic cylinder, but an electric mechanism such as an electric cylinder or an electric motor may be used.

(5) In the above embodiment, the case where the running state determination means (the neutral switch 72) is constituted by the switch that is turned on (low-speed running state) when the main shift operation element 60 is operated to the neutral region NA and turned off (low-speed running state) when the main shift operation element 60 is operated to the running region SA has been described, but instead of this configuration, for example, the running state determination means may be configured to determine the running state by a potentiometer and a determination unit that determines whether or not the detection value of the potentiometer is output as the detection value corresponding to the neutral region.

(6) In the above embodiment, the switching notification means is configured to include the buzzer 80, but the switching notification means may be configured to include a display lamp for notifying an abnormality instead of or in addition to the buzzer.

(7) In the above embodiment, the abnormality notification means is configured to blink the sub-transmission display unit 76 (two display lamps 76a and 76b) indicating the state of the sub-transmission 32, but instead of this configuration, a lamp dedicated to abnormality notification may be used, or a configuration may be employed in which an abnormality is notified by sound.

(8) In the above embodiment, the sub-transmission device 32 is configured to be switchable between a high speed state and a low speed state as a plurality of gear shift stages, but the sub-transmission device 32 may be configured to be switchable between three or more gear shift stages.

(9) The invention can be applied to harvesters such as combine harvesters, corn harvesters and the like.

< second embodiment >

Hereinafter, a case where the embodiment of the harvester of the present invention is applied to a general-type combine harvester will be described based on the drawings.

[ integral Structure ]

As shown in fig. 16 to 18, the combine harvester includes: a harvesting and conveying section 201 for harvesting and conveying a crop rearward; a cab 203 covered with the cab 202; a threshing device 204 for threshing the crop harvested by the harvesting conveyor 201; a grain tank 205 for storing grains obtained by the threshing process performed by the threshing device 204; a power unit 206 having an engine 221 as a power source; a pair of left and right front wheels 208 as a running device that is not steerable and is rotationally driven; and a pair of left and right rear wheels 209 that can be steered.

In the present embodiment, when the front-rear direction of the machine body is defined, the machine body is defined along the traveling direction of the machine body in the working state, and when the left-right direction of the machine body is defined, the left-right direction is defined in a state viewed from the traveling direction of the machine body. That is, the direction indicated by the reference symbol (F) in fig. 16, 17, and 18 is the front side of the machine body, and the direction indicated by the reference symbol (B) in fig. 16, 17, and 18 is the rear side of the machine body. The direction indicated by the reference symbol (L) in fig. 18 is the left side of the body, and the direction indicated by the reference symbol (R) in fig. 18 is the right side of the body.

The harvesting conveyor 201 is supported at the front of the machine body so as to be swingable and liftable about a lateral fulcrum P21. The harvesting conveyor 201 can be driven to ascend and descend by the operation of the harvesting lifting cylinder 210. The harvest transport unit 201 includes: a harvesting head 211 for harvesting the planted crop and collecting the harvested crop toward the center in the harvesting width direction; and a straw conveying device 212 for conveying the harvested and gathered crops to the threshing device 204 behind the machine body.

The harvesting head 211 includes: a rotary drum 213 into which the ear awns of a crop to be harvested are raked laterally rearward; a pusher-type harvesting knife 214 for cutting the root of the crop and harvesting the crop; and a horizontal conveyance auger 215 for gathering the harvested crop to the center in the harvesting width direction.

The threshing device 204 is provided at a lower position in the center portion in the left-right direction of the machine body. A grain tank 205 is provided on the front side of the body above the threshing device 204. Further, an engine 221 as a power source is provided on the rear side of the body above the threshing device 204. That is, the grain tank 205 and the engine 221 are provided in parallel in the front-rear direction.

[ body support Structure ]

The body support structure will be explained.

As shown in fig. 19 and 20, a body frame 225 supporting the entire body is configured by a pair of left and right main frames 222 extending in the body front-rear direction, a front connecting portion 223 connecting front portions of the left and right main frames 222, and a rear connecting portion 224 connecting rear portions of the left and right main frames 222.

The left and right main frames 222 are formed of channel members having a substantially C-shaped cross section, and are provided long from the front of the machine body to the rear of the machine body as shown in fig. 16 and 17. Axles 208a and 209a of left and right front wheels 208 and left and right rear wheels 209 are provided at positions lower than the left and right main frames 222. As shown in fig. 19 and 20, the left and right main frames 222 are provided with left and right front wheels 208 and left and right rear wheels 209 in a state of being positioned on the left and right outer sides of the machine body, respectively, and the left and right main frames 222 are supported by the left and right front wheels 208 and the left and right rear wheels 209.

The front connecting portion 223 will be explained.

As shown in fig. 19 and 20, the front connecting portion 223 includes: left and right base portions 226 protruding forward from the left and right main frames 222; an upper horizontal frame 227 connecting the left and right base portions 226; and a lower lateral frame 228 connecting the left and right side portions below the left and right base portions 226.

The base portion 226 is integrally connected to front end portions of the left and right main frames 222 in a state of protruding forward. The upper horizontal frame 227 has a square tubular shape, extends across the left and right base portions 226, and is integrally connected to the base portions 226 at both left and right sides thereof. Left and right axle boxes 229 that rotatably support the left and right front wheels 208 are coupled to the lower surfaces of left and right base portions 226 that protrude forward from the left and right main frames 222. Thus, the front side of the main frame 222 is supported by the front wheels 208. The axle housing 229 will be described later.

The lower horizontal frame 228 includes: a left-right front-rear direction connecting body 230 extending in the front-rear direction; a rear lateral connecting member 231 connecting the left and right front and rear facing connecting members 230 to the rear; and a front-side transverse connecting member 232 connecting the left and right front and rear facing connecting members 230. The front-side lateral coupling member 232 is bolted to the left and right axle boxes 229. Rear lower side portions of the left and right axle boxes 229 are connected to each other by a lateral tube frame 233 made of a circular tube material. The inner space of the lateral pipe frame 233 is used as a storage portion of the working oil.

A travel transmission 234 for shifting the power from the engine 221 is provided in a state of being interposed between the upper lateral frame 227 and the lower lateral frame 228. As shown in fig. 23 and 24, the travel transmission 234 includes: a gear box 236, in which a gear type speed change mechanism 235 is installed; and a hydrostatic continuously variable transmission (HST)237 integrally coupled to a lateral side of the transmission 236. The transmission 236 includes, on the left and right sides: left and right traveling drive shafts 238 that transmit power after the shift to the left and right front wheels 208 while projecting outward in the left-right direction from both the left and right portions of the transmission case 236; and left and right axle boxes 229 that cover the left and right travel drive shafts 238, respectively. The front end portion of the transmission case 236 is coupled to the middle portion in the left-right direction of the lateral pipe frame 233 via a coupling member 240.

The left and right axle boxes 229 include a cylindrical box portion 229a extending laterally outward from the transmission case 236, and a front wheel drive box portion 229b provided in a state of being connected to the cylindrical box portion 229a, incorporating a gear type reduction mechanism 241 (see fig. 23) and supporting the front wheels 208. The cylindrical case part 229a and the front wheel drive case part 229b are integrally coupled. The left and right front wheel drive case sections 229b are coupled by the lower lateral frame 228.

The rear connecting portion 224 will be described.

As shown in fig. 20, the rear connecting portion 224 includes a rear connecting body 242 made of a circular pipe material located below the left and right main frames 222 and extending across the left and right main frames 222, and a rear wheel support body 243 provided across the left and right rear wheels 209 is supported by the rear connecting body 242 so as to be swingable about a front-rear axis P22.

That is, the left and right main frames 222 are provided with support frames 244 projecting downward at the vehicle body rear side portions, and the rear connecting bodies 242 are connected so as to straddle the left and right support frames 244. A swing support portion 245 is provided in a fixed state at a left-right intermediate portion of the rear coupling body 242, and an intermediate portion in the vehicle transverse direction of the rear wheel support body 243 in the vehicle transverse direction is supported by the swing support portion 245 so as to be swingable about an axis P22 oriented in the vehicle front-rear direction.

Left and right rear wheels 209 are supported by left and right end portions of the rear wheel support body 243 so as to be swingable about a vertical axis, and a steering cylinder 246 is provided on a rear portion side of the rear wheel support body 243 in the left-right direction. The rear wheels 209 are capable of swinging about the vertical axis by operation of the steering cylinder 246, thereby turning the body.

[ threshing device ]

Next, the threshing device 204 will be described.

As shown in fig. 16 and 17, the threshing device 204 includes: a threshing unit 247 for performing threshing; and a sorting unit 248 that performs sorting processing on the processed object subjected to the threshing processing by the threshing unit 247. The threshing section 247 includes a substantially box-shaped threshing frame 249 surrounding the outer periphery thereof, and a threshing cylinder 250 (see fig. 23) rotating about a rotation axis in the front-rear direction of the machine body is provided inside the threshing frame 249, and threshing the harvested straw is performed.

The sorting unit 248 has a sorting unit frame 251 formed of a rectangular peripheral wall portion, and a sorting unit 252 (see fig. 23) for sorting out grains, secondary products such as grains with branches, and waste straw chips while swinging the processed product subjected to the threshing process inside the sorting unit frame 251.

In this way, the threshing unit 247 and the sorting unit 248 are respectively constituted by a threshing frame 249 and a sorting unit frame 251, and the threshing frame 249 is a frame structure having a large support strength covering the peripheral portion of the periphery. A shredding device 253 that shreds the threshed objects (such as waste straw scraps) threshed by the threshing device 204 is provided on the rear side of the machine body of the threshing device 204.

As shown in fig. 23, the sorting processing unit 252 includes: a screw conveyor type primary material recovery device 255 that conveys grains sorted by dropping toward the lateral side while being transferred by the swing sorting device 254 in a swing manner; a screw conveyor type secondary material recovery device 256 that conveys the secondary material to one side in the lateral direction; and a blower 257 for supplying the processed object with the sorted air.

The sorting unit 248 includes, on the outside of the right side: a grain delivery conveyor 258 for conveying the grains delivered from the primary-material recovery device 255 into the grain tank 205 above; and a secondary material returning device 259 for returning the secondary material sent from the secondary material collecting device 256 to the threshing unit 247.

Threshing frames 249 constituting the threshing unit 247 are placed on and supported by the left and right main frames 222. The threshing frame 249 is integrally connected to left and right side wall portions, a rear wall portion, a front wall portion, and the like, although not described in detail. The reinforcing support body is also provided with a plurality of reinforcing support bodies composed of square tubular materials, angle materials and the like.

As shown in fig. 16 and 17, the left and right main frames 222 are disposed in a horizontal state in which they are substantially parallel to the ground surface in a state in which the machine body is in contact with the ground surface, and the upper portion of the threshing device 204 is disposed in a rearward-inclined state in which it is positioned upward toward the rear of the machine body.

The sorting unit frame 251 constituting the sorting unit 248 is suspended from the left and right main frames 222. Although not described in detail, the sorting unit frame 251 is formed in a rectangular frame shape including side wall portions covering both left and right sides of the sorting unit 248 and a front side support portion connecting front portions of the left and right side wall portions to each other. Upper end portions of the left and right side wall portions are brought into contact with lower surfaces of the left and right main frames 222, fixed by bolt fastening, and suspended and supported.

[ grain case ]

Next, the grain box 205 will be explained.

As shown in fig. 21 and 22, a grain tank 205 is provided above the threshing device 204 on the front side of the machine body. The grain tank 205 is supported on the upper part of the threshing frame 249. That is, the front side of the body of the grain tank 205 is placed on and supported by the threshing frame 249 via the front side tank support frame 260, and the rear side of the body of the grain tank 205 is placed on and supported by the threshing frame 249 via the rear side tank support frame 261.

The grain tank 205 is provided with a grain discharge device H for discharging stored grains to the outside of the body. The grain discharging device H is provided with: a transverse conveying part 262 which is positioned at the lower part of the inner side of the grain box 205 and transversely conveys grains; and a discharge conveyor 263 which is located outside the grain tank 205 and conveys the grains conveyed by the horizontal conveying section 262 to a discharge position.

The grain tank 205 is formed to be narrow downward as viewed from the front-rear direction of the body, and as shown in fig. 17, the discharge conveyor 263 is disposed in a state where a base end portion 264 is supported by a portion of the grain tank 205 that is inclined to be narrow downward. The base end portion 264 is supported to be rotatable about an axial center orthogonal to the inclined surface. The discharge conveyor 263 is configured to be switchable between an extended state in which a distal end portion is extended outward from the machine body and a retracted state in which the distal end portion is retracted inward from the machine body by rotating a proximal end portion by a hydraulic cylinder 265. As shown in fig. 17, the discharge conveyor 263 is inclined upward toward the rear of the machine body in the stored state, and is stored in a state of entering a downward narrow concave portion of the grain tank 205.

[ power section ]

Next, the power unit 206 will be described.

As shown in fig. 22, the power unit 206 is supported by the threshing frame 249 in a state of being positioned on the rear side of the grain tank 205. As shown in fig. 17 and 18, substantially the entire area of the outer peripheral portion of the power unit 206 is covered with the power unit cover 266. As shown in fig. 21, the power unit cover 266 includes, on the inner side: an engine 221 as a power source, an air cleaner 267 that cleans air for combustion supplied to the engine 221, a strainer 268 that removes dust in advance from outside air taken in and supplies the air to the air cleaner 267, a radiator 269 that cools the engine 221, and the like. A cooling fan 270 for generating cooling air is provided in the vicinity of the radiator 269. The cooling fan 270 is driven by a hydraulic motor 271.

As shown in fig. 21, the engine support frame 272 is provided to support the engine 221. The engine support frame 272 extends across the left and right side wall portions of the threshing frame 249, and is mounted and supported on the upper portion of the threshing frame 249 via the left and right side longitudinal surface portions 273. The upper portion of the threshing frame 249 is disposed in a rearward-inclined state in which the upper side is located further toward the rear of the machine body, but the width of the left and right side longitudinal portions 273 is formed narrower toward the rear of the machine body, and therefore the engine support frame 272 is in a horizontal state. An engine 221 is mounted on the engine support frame 272.

The work table 274 is provided in a state of being positioned on the rear side of the air cleaner 267 and the strainer 268 in the machine body, and maintenance work can be easily performed. The work table 274 includes: a ladder 275 for an operator to get on and off a work table 274 (see fig. 16 and 17) from outside the machine body; and a backrest 276 to support the operator.

[ Transmission Structure 1 ]

A transmission structure for transmitting the power of the engine 221 to the threshing device 204 and the harvesting conveyor 201 will be described.

As shown in fig. 21 and 23, the engine 221 is provided in a state in which the output shaft 221A is oriented in the left-right direction and protrudes in the left direction. As shown in fig. 21, the threshing machine is provided with a first transmission mechanism D1 (corresponding to a transmission mechanism for threshing driving) for transmitting the power of the engine 221 from the output shaft 221A to the threshing cylinder drive shaft 305 for driving the threshing cylinder, and a second transmission mechanism D2 for transmitting the power from the threshing cylinder drive shaft 305 to the swing sorting device 254, the primary material collecting device 255, the secondary material collecting device 256, and the air blowing device 257, which are other driven devices disposed in the sorting unit 248. The first transmission mechanism D1 and the second transmission mechanism D2 are provided in a state of being located on the left side of the body with respect to the engine 221.

As shown in fig. 23, a threshing cylinder transmission 306 for transmitting power transmitted to a threshing cylinder drive shaft 305 to a threshing cylinder while changing the speed is provided at a position above a shredding device 253 on the rear side of the machine body of the threshing device 204. The threshing cylinder transmission 306 is constituted by a two-stage gear type speed change mechanism, and the periphery thereof is covered with a casing.

As shown in fig. 21, the first transmission mechanism D1 is a belt transmission mechanism that transmits power from the output shaft 221A of the engine 221 to the threshing cylinder drive shaft 305. In the first transmission mechanism D1, a belt is wound over the output pulley 308 provided on the output shaft 221A and the input pulley 309 provided on the threshing cylinder drive shaft 305. The first transmission mechanism D1 is located on the left side of the threshing device 204, is disposed in a state of inclining downward and rearward and declining as it goes further toward the rear of the machine body, and transmits power to the rear lower side.

The second transmission mechanism D2 includes a threshing input shaft 311 to which power is input from the threshing cylinder drive shaft 305, and a threshing relay shaft 312 to which power is transmitted from the threshing input shaft 311, and is arranged to transmit power from the threshing input shaft 311 to the swing sorting device 254, and to transmit power from the threshing relay shaft 312 to the primary material recovery device 255, the secondary material recovery device 256, and the blower 257.

That is, the second transmission mechanism D2 includes: a belt-type first threshing transmission mechanism 313 for transmitting power from the threshing cylinder drive shaft 305 to the threshing input shaft 311; a belt-type second threshing transmission mechanism 314 for transmitting power from the threshing input shaft 311 to the threshing relay shaft 312; a belt-type third threshing transmission mechanism 315 for transmitting power from the threshing relay shaft 312 to the primary material recovery device 255; a belt-type fourth threshing transmission mechanism 316 for transmitting power from the primary-material recovery device 255 to the secondary-material recovery device 256; a belt-type fifth threshing transmission mechanism 317 for transmitting power from the primary material recovery device 255 to the air blowing device 257; and a chain transmission mechanism 318 for transmitting power from the threshing input shaft 311 to the swing sorting device 254 (specifically, the swing drive unit).

The threshing cylinder drive shaft 305 is provided at a high position at the rear of the threshing section 247, and the input shaft 311 for threshing is provided in a state of being located closer to the front side of the machine body than the threshing cylinder drive shaft 305 and located at the lower part of the threshing section 247. As a result, the first threshing transmission mechanism 313 is disposed in an inclined state in which it is inclined downward. On the other hand, the second threshing transmission mechanism 314 is disposed in a state of extending from the threshing input shaft 311 toward the front in a substantially horizontal posture. Therefore, the first threshing transmission mechanism 313 and the second threshing transmission mechanism 314 are provided in a state bent in a substantially L-shape protruding downward. By providing the transmission mechanism in this way, the outside of the left side of the threshing section 247 is largely opened, and maintenance work of the threshing section 247 is facilitated.

The fifth threshing transmission mechanism 317 is provided with a blowing transmission mechanism 319 configured by a belt type continuously variable transmission of a split pulley type. Although not described in detail, the air blowing transmission mechanism 319 can change the speed by changing the belt winding diameter by changing the interval between the component pulleys by an incorporated cam mechanism. The power transmitted to the primary recovery device 255 is transmitted to the grain winnowing conveyor 258. The power transmitted to the secondary product recovery device 256 is transmitted to the secondary product returning device 259.

The harvesting unit includes a belt-type harvesting transmission 327 as a third transmission D3 for transmitting the power transmitted to the sorting unit 252 to the harvesting conveyor 201. The harvesting transmission mechanism 327 is configured to transmit power from the threshing relay shaft 312 to the harvesting input shaft 217 of the harvesting conveyor 201. Although not shown, power is transmitted from the harvesting input shaft 217 to the rotary drum 213, the harvesting knife 214, and the traverse auger 215.

The shredder is provided with a belt type shredding transmission mechanism 336 for transmitting power from the threshing cylinder drive shaft 305 to the shredding device 253. The shredding transmission mechanism 336 is disposed in a state of extending downward from the threshing cylinder drive shaft 305.

[ Transmission Structure 2 ]

Next, a transmission structure for transmitting the power of the engine 221 to the grain discharging device H and the front wheels 208 will be described.

As shown in fig. 21, a fourth transmission mechanism D4 for transmitting power from the engine 221 to the grain discharging device H and the front wheels 208 is provided, and the power of the engine 221 is branched to the first transmission mechanism D1 and the fourth transmission mechanism D4 at the output shaft 221A of the engine 221. The fourth transmission mechanism D4 includes an intermediate shaft 338 as a first relay shaft to which power is transmitted from the output shaft 221A of the engine 221 via the transmission belt 337, and a power train and a travel drive train in which the power of the engine 221 is branched from the right end of the intermediate shaft 338 and transmitted to the grain discharging device H. Therefore, a power transmission unit for transmitting the power from the output shaft 221A of the engine 221 to the grain discharger H and the front wheels 208 is provided on the right side of the machine body with respect to the engine 221.

The intermediate shaft 338 extends from one lateral side portion to the other lateral side portion of the threshing device 204 in a state of being inserted through the inside of the circular tube-shaped lower coupling member 284a of the rear side case support frame 261, and is supported so as to be rotatable about the left-right direction axis center. The center shaft 338 is disposed in an area surrounded by the upper surface of the threshing device 204, the grain tank 205, and the engine 221 when viewed from the side.

As shown in fig. 22, the fourth transmission mechanism D4 includes: a belt-type discharge transmission mechanism 339 for transmitting the power from the intermediate shaft 338 to the transverse conveying part 262 in the grain discharge device H; a belt-type first transmission mechanism 341 for traveling that transmits power from the intermediate shaft 338 to a traveling relay shaft 340 provided on the front lateral side of the threshing section 247; and a belt-type second transmission mechanism 342 for traveling that transmits power from the traveling relay shaft 340 to the traveling drive device.

The discharge transmission mechanism 339 is disposed in a state of extending in a substantially horizontal posture toward the front. The power transmitted from the discharge transmission mechanism 339 is transmitted to the discharge conveyor 263 on the left side of the machine body via the cross conveyor 262.

The first transmission mechanism 341 for traveling is disposed in a state of extending in an inclined posture from the intermediate shaft 338 in the front-down direction. The transmission case 236 is disposed at a position below the grain tank 205 in the lower portion of the machine body, and the second transmission mechanism 342 for traveling is disposed in a state of extending downward from the relay shaft 340 for traveling in a substantially vertical posture.

The transmission structure of the travel transmission 234 will be described.

As shown in fig. 24, a transmission case 236 of the travel transmission 234 is provided with an input shaft 343 projecting outward to the right of the machine body. An outwardly projecting shaft portion 343a of the input shaft 343, which projects outwardly from the transmission case 236, is provided with an input pulley 344 as an input rotator. The power from the engine 221 is input to the input pulley 344 via the fourth transmission mechanism D4.

The power transmitted to the input shaft 343 is shifted by the hydrostatic continuously variable transmission 237 and the gear type transmission mechanism 235 in the transmission 236, and then transmitted to the left and right travel drive shafts 238 via the differential mechanism 345, and further transmitted to the wheel drive shafts 346 via the gear type reduction mechanism 241. Although the explanation about the detailed structure is omitted, the travel transmission 234 is configured to: the power is transmitted so as to drive the left and right front wheels 208 at a speed suitable for the driving operation based on the driving operation of a shift operation element, a turning operation element, and the like, not shown, disposed in the driving unit 203. The left and right front wheels 208 are driven at a constant speed or substantially at a constant speed during straight traveling, and with a speed difference during cornering.

Further, a power take-out portion 347 is provided for taking out power from a region between the input pulley 344 of the input shaft 343 and the transmission case 236 of the travel transmission device 234 to the outside. As shown in fig. 24, the power take-off 347 includes: a gear-type power branching portion 348 for branching power from the input shaft 343; and an output shaft 349 that outputs the power branched by the power branching portion 348. Further, the transmission case 350 is provided to cover the outer side of each of the outwardly projecting shaft sections 343a of the power take-out section 347 and the input shaft 343.

The transmission case 350 includes: a cylindrical box section 350a covering the outside of the outwardly projecting shaft section 343 a; and a gear box portion 350b provided in a state of being connected to the cylindrical box portion 350a and covering the power branching portion 348. The power branching portion 348 is constituted by a gear transmission mechanism straddling the input shaft 343 and the output shaft 349. The output shaft 349 protrudes outward to the left side, i.e., to the transmission case 236 side, from a left side wall portion of the gear case portion 350b in the transmission case 350. That is, the power branching portion 348 is provided in a state of extending toward the transmission case 236 (the travel transmission 234).

The transmission case 350 has a first support portion 353 located on the side close to the travel transmission 234 and a second support portion 354 located on the side close to the input pulley 344 and is supported at the supported portions (229, 234) at the first support portion 353 and the second support portion 354, respectively.

The travel transmission device 234 is set as a supported portion corresponding to the first supporting portion 353, and the first supporting portion 353 is supported by the travel transmission device 234. The right axle box 229 of the left and right axle boxes 229 is set as a supported portion corresponding to the second support portion 354, and the second support portion 354 is supported by the axle box 229. The first support portion 353 is connected to the outer side surface of the travel transmission 234 in a state of being in contact with the outer side surface in the left-right direction, and the second support portion 354 is connected to the outer side surface of the axle box 229 in a state of being in contact with the outer side surface in the left-right direction.

A coupling stopper 355 is provided on the right lateral side wall of the transmission case 236. A first support portion 353 coupled to a coupling stopper 355 is provided at an end portion of the transmission case 350 on the left side of the body (on the transmission case side) of the cylindrical case portion 350 a. The connection stopper 355 and the first support 353 are coupled by a plurality of bolts in a state where the first support 353 abuts against the connection stopper 355 in the left-right direction.

The axle box 229 includes a connecting stopper 356 on a lateral side wall of the front wheel drive case portion 229 b. A second support portion 354 coupled to a coupling stopper 356 is provided at the right-side (input pulley side) end of the body of the gear box portion 350b of the transmission case 350. The connecting stopper 356 and the second support portion 354 are coupled by a plurality of bolts in a state where the second support portion 354 abuts against the connecting stopper 356 in a state where the second support portion 354 abuts against each other in the left-right direction.

[ Hydraulic pump ]

As shown in fig. 23 and 24, a hydraulic pump 357 driven by the power extracted by the power extraction unit 347 is provided. The hydraulic pump 357 is integrally connected to a left side wall portion of the gear box portion 350b of the transmission case 350. When the hydraulic pump 357 is rotationally driven by the power branched by the power branching portion 348, as shown in fig. 25, the oil stored inside the lateral pipe frame 233 is sucked through the suction pipe 359 and supplied to the hydraulic motor 271 that drives the radiator cooling fan 270 through a hydraulic valve, not shown. The other hydraulic pump 358 for supplying pressurized oil to hydraulic devices other than the hydraulic motor 271, for example, the hydrostatic continuously variable transmission 237, the harvesting lift cylinder 210, and the like, is disposed on the left side of the travel transmission 234. The other hydraulic pump 358 is driven by an input shaft 343.

[ other embodiments ]

(1) In the above embodiment, the output shaft of the power take-out section is configured to extend from the power branching section to the travel transmission device, but the output shaft may be configured to extend to the input pulley side.

(2) In the above embodiment, the first support portion of the transmission case is connected to the outer side surface of the travel transmission device in a contact state, and the second support portion is connected to the outer side surface of the axle box in a contact state.

(3) In the above embodiment, the transmission case is supported by the travel transmission device and the axle box in a state of being supported at both ends, but instead of this structure, the following structure may be adopted.

(3-1) the transmission case is supported on one side by the travel transmission device and on the other side by a dedicated frame structure disposed separately.

(3-2) a structure in which one side of the transmission case is supported by a dedicated frame separately disposed and the other side is supported by an axle box.

(3-3) one side and the other side of the transmission case are supported by the structure of a dedicated frame which is additionally provided.

(3-4) a structure in which only either one of a portion of the transmission case located on the side close to the travel transmission and a portion located on the side close to the input rotary body is supported.

(4) In the above embodiment, the hydraulic pump 357 is driven by the power extracted from the power extraction unit, but instead of this configuration, the power may be used to drive the harvesting conveyor 201, or a shredding device for shredding the residual stalks left in the field when applied to a corn harvester.

(5) In the above embodiment, the engine 221 is provided as the drive source, but an electric motor may be used instead of the engine as the drive source.

(6) The invention can be used for not only a common combine harvester, but also a semi-feeding combine harvester, and can be applied to other types of harvesters such as corn harvesters and the like besides the combine harvester.

Description of the reference numerals

4: an engine; 30: a speed change device; 31: a main transmission; 32: a sub-transmission; 33: a gearbox; 41: a shift operating mechanism; 44: an operating member; 47: an operation position detection sensor; 48: a support member; 49: a first mounting portion; 51: a second mounting portion; 54: a third mounting portion; 60: a main shift operating member; 72: a running state determination unit; 73: a sub-transmission operating member; 76: an abnormality notification unit; 79: a control unit; 80: a handover notification unit; CY 3: an actuator; NA: a neutral zone; and SA: a driving area; NW: a neutral operating zone; NL: a central location; 221: a drive source; 229: an axle box; 234: a travel transmission; 343: an input shaft; 343 a: an outwardly projecting shaft portion; 344: an input rotating body; 347: a power take-out section; 348: a power branching section; 349: an output shaft; 350: a transmission case; 353: a first support section; 354: a second support portion.