阅读说明：本技术 电动作业车辆 (Electric working vehicle ) 是由 鸟取纪太 野上广宣 宫崎大辅 葛西錬汰 中山大辅 于 2020-05-27 设计创作，主要内容包括：电动作业车辆具备：行驶用蓄电池(4)、辅机用蓄电池(18)、利用从行驶用蓄电池(4)供给的电力进行驱动的电机、由电机驱动的行驶装置、配置在比行驶用蓄电池(4)靠前侧的位置并且对来自行驶用蓄电池(4)的电力进行降压并向辅机用蓄电池(18)供给的电压转换器(19)、以及配置在比行驶用蓄电池(4)靠前侧的位置的散热器(15),电压转换器(19)和散热器(15)在俯视时以横向排列的状态配置。(The electric working vehicle is provided with: the vehicle-mounted power supply device is provided with a battery (4) for running, a battery (18) for auxiliary machinery, a motor driven by power supplied from the battery (4) for running, a running device driven by the motor, a voltage converter (19) arranged at a position forward of the battery (4) for running, and used for reducing the power from the battery (4) for running and supplying the power to the battery (18) for auxiliary machinery, and a radiator (15) arranged at a position forward of the battery (4) for running, wherein the voltage converter (19) and the radiator (15) are arranged in a horizontal arrangement state in a plan view.)

1. An electric working vehicle, comprising:

a battery for running;

a storage battery for the auxiliary machine;

a motor that is driven by electric power supplied from the running battery;

a traveling device driven by the motor;

a voltage converter that is disposed on the front side of the running battery, and that steps down electric power from the running battery and supplies the electric power to the auxiliary battery; and

a radiator disposed on a front side of the battery for running,

the voltage converter and the heat sink are arranged in a state of being arranged in a lateral direction in a plan view.

2. The electric work vehicle according to claim 1,

the heat sink, the voltage converter, and the auxiliary battery are arranged in a lateral arrangement in a plan view.

3. The electric working vehicle according to claim 1 or 2,

the electric working vehicle is provided with a reserve tank for the radiator,

the heat sink, the voltage converter, and the reserve tank are arranged in a state of being arranged in a lateral direction in a plan view.

4. The electric work vehicle according to claim 3,

the reserve tank and the auxiliary battery are arranged in a state of being arranged in the vertical direction of the machine body.

5. The electric working vehicle according to any one of claims 1 to 4,

the electric working vehicle includes a door-shaped radiator frame that is disposed so as to surround the radiator and supports the radiator,

the voltage converter is disposed in a state where a longitudinal direction of the voltage converter is along a vertical direction of the body, and is attached to the heat sink frame.

6. The electric work vehicle according to claim 5,

the electric working vehicle includes:

a cooling water hose connected to the radiator;

a cover member that is openable and closable to accommodate the voltage converter, the radiator, the cooling water hose, and the radiator frame;

a support portion extending upward from an upper portion of the radiator frame; and

a cover support member coupled to an upper end of the support portion and capable of supporting the cover member in an open state,

the support portion has: a first portion extending upward from an upper portion of the radiator frame, a second portion extending forward from a middle portion of the first portion in a vertical direction of the body, and a third portion extending downward from a front end portion of the second portion and connected to the upper portion of the radiator frame,

the cooling water hose is disposed so as to pass through a region surrounded by the first portion, the second portion, and the third portion.

Technical Field

The present invention relates to an electric working vehicle including a battery for running, a motor driven by electric power supplied from the battery for running, and a running device driven by the motor.

Background

The work vehicle described in patent document 1 (in patent document 1, "tractor") includes an engine and a traveling device (in patent document 1, "front wheels" and "rear wheels") driven by the engine.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-69926

Disclosure of Invention

Problems to be solved by the invention

In the work vehicle described in patent document 1, it is conceivable to provide a battery and a motor instead of the engine. This allows the vehicle to travel without discharging exhaust gas.

In the work vehicle described in patent document 1, it is conceivable to provide a cooling water path through various devices and cool the cooling water by a radiator. This enables various devices to be cooled.

In the work vehicle described in patent document 1, it is conceivable to provide an auxiliary battery and a voltage converter for stepping down electric power from the running battery and supplying the electric power to the auxiliary battery. This enables electric power to be supplied to the auxiliary battery.

Here, it is assumed that good cooling of the voltage converter and good cooling of the radiator cannot be achieved at the same time depending on the arrangement positions of the voltage converter and the radiator. Further, a situation in which maintenance work becomes complicated is conceivable.

For example, in a configuration in which the voltage converter is disposed in front of the radiator, cooling air supplied from the front of the radiator toward the radiator as the work vehicle travels is blocked by the voltage converter. As a result, the voltage converter is cooled well, but the radiator cannot be cooled well. That is, good cooling of the voltage converter and good cooling of the radiator cannot be achieved at the same time.

For example, in a configuration in which the voltage converter is disposed on the rear side of the battery for running and the radiator is disposed on the front side of the battery for running, the voltage converter and the radiator are disposed in a dispersed manner in the front and rear of the battery for running. Thus, it is often difficult to maintain both the voltage converter and the heat sink. As a result, maintenance work tends to become complicated.

The invention aims to provide an electric working vehicle which can realize good cooling of a voltage converter and good cooling of a radiator and is easy to maintain.

Means for solving the problems

The present invention is characterized by comprising: a battery for running; a storage battery for the auxiliary machine; a motor that is driven by electric power supplied from the running battery; a traveling device driven by the motor; a voltage converter that is disposed on the front side of the running battery, and that steps down electric power from the running battery and supplies the electric power to the auxiliary battery; and a radiator disposed on a front side of the battery for running, wherein the voltage converter and the radiator are disposed in a lateral arrangement in a plan view.

According to the present invention, the voltage converter and the heat sink are arranged in a state of being arranged in a lateral direction in a plan view. Therefore, the cooling wind direction voltage converter and the radiator are supplied in parallel with the travel of the work vehicle. That is, the cooling air supplied to one of the voltage converter and the radiator is not blocked by the other of the voltage converter and the radiator.

This makes it possible to achieve both satisfactory cooling of the voltage converter and satisfactory cooling of the radiator.

Further, according to the present invention, the voltage converter and the radiator are disposed together on the front side of the battery for running. Thereby, it is easy to maintain the voltage converter and the heat sink at the same time. Therefore, maintenance work is easily performed.

That is, according to the present invention, it is possible to realize an electric working vehicle that can achieve both of good cooling of the voltage converter and good cooling of the radiator and that can facilitate maintenance work.

In the present invention, it is preferable that the heat sink, the voltage converter, and the auxiliary battery are arranged in a lateral direction in a plan view.

According to this configuration, the cooling air is supplied in parallel to the radiator, the voltage converter, and the auxiliary battery as the work vehicle travels. This makes it easy to cool all of the radiator, the voltage converter, and the auxiliary battery satisfactorily.

Further, according to this configuration, the radiator, the voltage converter, and the auxiliary battery are collectively disposed on the front side of the running battery. This makes it easy to maintain the radiator, the voltage converter, and the auxiliary battery at the same time. Therefore, maintenance work is easily performed.

In the present invention, it is preferable that the radiator includes a reserve tank for the radiator, and the radiator, the voltage converter, and the reserve tank are arranged in a state of being arranged in a lateral direction in a plan view.

According to this configuration, the cooling air is supplied in parallel to the radiator, the voltage converter, and the reserve tank as the work vehicle travels. This makes it easy for the radiator, the voltage converter, and the reserve tank to be well cooled.

Further, according to this configuration, the radiator, the voltage converter, and the reserve tank are collectively disposed on the front side of the battery for running. This makes it easy to maintain the radiator, the voltage converter, and the reserve tank at the same time. Therefore, maintenance work is easily performed.

In the present invention, it is preferable that the reserve tank and the auxiliary battery are arranged in a vertical direction of the machine body.

According to this configuration, as the work vehicle travels, the cooling air is supplied in parallel to the radiator, the voltage converter, the reserve tank, and the auxiliary battery. This makes it easy to cool all of the radiator, the voltage converter, the reserve tank, and the auxiliary battery satisfactorily.

Further, according to this configuration, the radiator, the voltage converter, the reserve tank, and the auxiliary battery are collectively disposed on the front side of the running battery. This makes it easy to maintain the radiator, the voltage converter, the reserve tank, and the auxiliary battery at the same time. Therefore, maintenance work is easily performed.

Further, according to this configuration, the space required for arranging the reserve tank and the auxiliary battery can be easily reduced in the right-left direction of the body, as compared with the case where the reserve tank and the auxiliary battery are arranged in a horizontally aligned state in plan view. Therefore, the lateral width of the body is easily made compact.

In the present invention, it is preferable that the voltage converter includes a gate-shaped radiator frame which is disposed so as to surround the radiator and supports the radiator, and the voltage converter is disposed so as to be vertically oriented along the body in a longitudinal direction of the voltage converter and is attached to the radiator frame.

According to this configuration, the space required for disposing the voltage converter can be made smaller in the left-right direction of the body than in the case where the voltage converter is disposed so that the longitudinal direction of the voltage converter is along the left-right direction of the body. Therefore, the lateral width of the body is easily made compact.

Further, according to this configuration, the voltage converter can be supported by the radiator frame. This eliminates the need for providing a dedicated member for supporting the voltage converter. Therefore, the manufacturing cost is likely to be lower than in the case where a dedicated member is provided to support the voltage converter.

Further, in the present invention, it is preferable that: a cooling water hose connected to the radiator; a cover member that is openable and closable to accommodate the voltage converter, the radiator, the cooling water hose, and the radiator frame; a support portion extending upward from an upper portion of the radiator frame; and a cover support member coupled to an upper end portion of the support portion and capable of supporting the cover member in an open state, the support portion including: a first portion extending upward from an upper portion of the radiator frame, a second portion extending forward from a middle portion of the first portion in a vertical direction of the body, and a third portion extending downward from a front end portion of the second portion and connected to the upper portion of the radiator frame, wherein the cooling water hose is disposed in a state of passing through a region surrounded by the first portion, the second portion, and the third portion.

According to this configuration, the support portion is connected to the upper portion of the radiator frame at the first portion and the third portion. Therefore, the support portion is easily stably supported by the radiator frame, as compared with a case where the support portion is connected to the upper portion of the radiator frame only at either one of the first portion and the third portion.

Further, according to this configuration, the region surrounded by the first portion, the second portion, and the third portion can be effectively used as the arrangement space of the cooling water hose. This facilitates the electric work vehicle to be compact in size.

Drawings

Fig. 1 is a right side view of the tractor.

Fig. 2 is a right side view showing the configuration of the periphery of the running battery.

Fig. 3 is a sectional view III-III of fig. 2.

Fig. 4 is a sectional view IV-IV of fig. 2.

Fig. 5 is a perspective view showing a structure of the periphery of the heat sink.

Fig. 6 is a plan view showing the structure of the motor and the like.

Fig. 7 is a diagram showing the structure of the coupling portion and the like.

Fig. 8 is a diagram showing the structure of the periphery of the opening.

Detailed Description

A mode for carrying out the present invention will be described based on the drawings. In the following description, the direction of arrow F shown in fig. 1 to 3, 6, and 7 is referred to as "front", the direction of arrow B is referred to as "rear", the direction of arrow L shown in fig. 3, 4, and 6 is referred to as "left", and the direction of arrow R is referred to as "right". The direction of arrow U shown in fig. 1, 2, and 4 is referred to as "up", and the direction of arrow D is referred to as "down".

[ integral structure of tractor ]

As shown in fig. 1, a tractor a (corresponding to an "electric work vehicle" of the present invention) includes left and right front wheels 10 (corresponding to a "travel device" of the present invention), left and right rear wheels 11 (corresponding to a "travel device" of the present invention), a cover member 12, and a tilling device 13.

The tractor a further includes a frame 2 and a cab 3.

The frame 2 is supported by left and right front wheels 10 and left and right rear wheels 11. The tilling device 13 is supported by the rear portion of the frame 2.

The cover member 12 is disposed at the front of the body. The driver part 3 is disposed behind the cover member 12.

The driving unit 3 includes a protection frame 30, a driver seat 31, a steering wheel 32, and a floor 33. The operator can sit on the driver seat 31. The operator can perform various driving operations in the driving unit 3.

The left and right front wheels 10 are steered by operation of the steering wheel 32. The operator can place his feet on the floor 33 while sitting on the driver seat 31.

That is, the tractor a includes the driver's cab 3 having the driver's seat 31 on which the operator can sit.

The tractor a further includes a running battery 4, a motor M, a transmission T, and a front transmission FT.

The cover member 12 is configured to be swingable around an opening/closing shaft core Q (see fig. 2) extending in the left-right direction of the body. This allows the cover member 12 to be opened and closed. When the cover member 12 is in the closed state, the travel battery 4 is housed in the cover member 12. Then, the battery 4 for running supplies electric power to the motor M.

The motor M is disposed below the running battery 4. The motor M is driven by electric power supplied from the battery 4 for running. The driving force of the motor M is transmitted to the transmission T.

The transmission T is located on the rear side of the battery 4 for running and is disposed behind the motor M. In addition, a front transmission FT extends from the transmission T to the front side. The transmission T changes the speed of the driving force received from the motor M and transmits the changed speed to the left and right rear wheels 11. Further, the driving force is also transmitted from the transmission T to the left and right front wheels 10 via the front transmission FT. Thereby, the left and right front wheels 10 and the left and right rear wheels 11 are driven.

That is, the tractor a includes the motor M disposed below the running battery 4 and driven by the electric power supplied from the running battery 4. The tractor a further includes left and right front wheels 10 and left and right rear wheels 11 driven by the motor M.

In addition, the transmission T transmits a part of the driving force received from the motor M to the tilling device 13. Thereby, the tilling device 13 is driven.

With the above configuration, the tractor a can perform a tilling operation by the tilling device 13 while traveling by the left and right front wheels 10 and the left and right rear wheels 11.

[ arrangement of a battery, a motor, and an inverter for traveling ]

As shown in fig. 2 to 4, the running battery 4 is disposed above the frame 2. A ventilation space S is formed between the frame 2 and the battery 4 for running.

That is, the tractor a includes the running battery 4 disposed above the frame 2.

The ventilation space S is a space configured to be able to ventilate.

The tractor a is further provided with an inverter 14. The inverter 14 is disposed below the running battery 4. The inverter 14 is disposed on the front side of the motor M.

The inverter 14 is configured to convert the direct current from the battery 4 for running into an alternating current and supply the alternating current to the motor M.

That is, the tractor a includes an inverter 14 that is disposed below the running battery 4 and on the front side of the motor M, converts dc power from the running battery 4 into ac power, and supplies the ac power to the motor M.

The motor M and the inverter 14 are arranged in the front-rear direction of the machine body.

Further, a first space S1 is formed between the inverter 14 and the running battery 4. The first space S1 is included in the ventilation space S. That is, the first space S1 is a space configured to be able to ventilate.

A second space S2 is formed between the motor M and the battery 4 for running. The second space S2 is included in the ventilation space S. That is, the second space S2 is a space configured to be able to ventilate.

Also, the motor M is configured to be in contact with the ventilation space S.

That is, the motor M is in contact with the ventilation space S.

The frame 2 includes left and right main frames 20 and an inverter support portion 21. The left and right main frames 20 extend in the front-rear direction of the machine body.

That is, the tractor a includes the left main frame 20 and the right main frame 20 extending in the front-rear direction of the machine body.

The motor M is disposed at a position sandwiched between the left and right main frames 20.

The inverter support portion 21 is provided so as to straddle the left and right main frames 20. The inverter support portion 21 is supported by the left and right main frames 20. The inverter 14 is supported by an inverter support portion 21.

That is, the inverter 14 is supported by the left main frame 20 and the right main frame 20 via the inverter support portion 21.

In fig. 3a first left end position LE1, a second left end position LE2, a third left end position LE3 are shown. The first left end position LE1 is the left end position of the left main frame 20. The second left end position LE2 is a left end position of the inverter 14. The third left end position LE3 is a left end position of the inverter support portion 21.

As shown in fig. 3, the second left end position LE2 is located on the left side of the first left end position LE 1. That is, the inverter 14 protrudes to the left side from the left end position of the left main frame 20.

The third left end position LE3 is located on the left side of the first left end position LE1 and the second left end position LE 2. That is, the inverter support portion 21 protrudes leftward from the left end position of the left main frame 20.

Fig. 3 shows a first right end position RE1, a second right end position RE2, and a third right end position RE 3. The first right end position RE1 is the right end position of the right main frame 20. The second right end position RE2 is the right end position of the inverter 14. The third right end position RE3 is the right end position of the inverter support portion 21.

As shown in fig. 3, the second right end position RE2 is located on the right side of the first right end position RE 1. That is, the inverter 14 protrudes to the right side from the right end position of the right main frame 20.

The third right end position RE3 is located on the right side of the first right end position RE1 and the second right end position RE 2. That is, the inverter support portion 21 protrudes to the right side of the right end position of the main frame 20.

That is, the inverter 14 protrudes to the left side from the left end position of the left main frame 20 and protrudes to the right side from the right end position of the right main frame 20.

The inverter support portion 21 projects leftward from the left end position of the left main frame 20 and projects rightward from the right end position of the right main frame 20.

As shown in fig. 2 to 4, the tractor a includes left and right first support frames 51, left and right second support frames 52, and a battery support portion 53.

The left and right first support frames 51 are positioned forward of the left and right second support frames 52. The left and right first support frames 51 and the left and right second support frames 52 are both provided upright on the inverter support portion 21.

That is, the left and right first support frames 51 and the left and right second support frames 52 are both provided upright on the frame 2.

Further, a plate-shaped support portion 38 and a plate-shaped partition member 56 described later are provided between the motor M and the running battery 4. The plate-like support portion 38 and the plate-like partition member 56 are both in the horizontal posture. Further, the plate-like partition member 56 is positioned above the plate-like support portion 38.

In addition, the rear support frame 59 is supported by the frame 2. The rear support frame 59 supports the rear end of the battery support portion 53 via the plate-like support portion 38 and the plate-like partition member 56.

The battery support portion 53 is disposed above the chassis 2. The battery support portion 53 is supported by the left and right first support frames 51, second support frames 52, and rear support frames 59. The running battery 4 is supported by the battery support portion 53.

That is, the tractor a includes a battery support portion 53 that is disposed above the frame 2 and supports the running battery 4.

With the above configuration, the running battery 4 is supported by the inverter support portion 21 via the battery support portion 53, the left and right first support frames 51, and the left and right second support frames 52.

That is, the running battery 4 is supported by the inverter support portion 21 via the first support brackets 51 erected on the left and right of the inverter support portion 21. The running battery 4 is supported by the inverter support portion 21 via second support brackets 52 provided upright on the left and right of the inverter support portion 21.

The frame 2, the battery support 53, the left first support frame 51, and the left second support frame 52 form a left ventilation opening K.

The frame 2, the battery support 53, the right first support frame 51, and the right second support frame 52 form a right ventilation opening K.

Moreover, the left and right ventilation openings K communicate with the ventilation space S, respectively.

That is, the ventilation space S communicates with the left and right ventilation openings K.

As shown in fig. 2, the battery support portion 53 has a plate-like bottom plate portion 53 a. The bottom plate portion 53a is disposed in a horizontal posture. The floor portion 53a separates the battery 4 for running from the inverter 14.

That is, the tractor a includes a floor portion 53a that separates the running battery 4 and the inverter 14.

[ arrangement of first plate-like Member and second plate-like Member ]

As shown in fig. 2 and 4, the tractor a includes a first plate-like member 54 and a second plate-like member 55.

The first plate-like member 54 and the second plate-like member 55 are installed to straddle the left and right main frames 20. The first plate-like member 54 is located on the front side of the second plate-like member 55. The first plate-like member 54 and the second plate-like member 55 are supported by the left and right main frames 20.

That is, the frame 2 supports the first plate-like member 54 and the second plate-like member 55.

Both the first plate-like member 54 and the second plate-like member 55 are disposed below the ventilation space S in a horizontal posture.

[ Structure of cover Member ]

As shown in fig. 1 and 3, the cover member 12 has an introduction portion 12 a. The introduction portion 12a is configured to be able to introduce outside air into the cover member 12. The introduction portion 12a is provided at the distal end portion of the cover member 12.

In the present embodiment, the introduction portion 12a is formed of a plurality of small holes. However, the present invention is not limited to this, and the introduction portion 12a may be of any other form. For example, the introduction portion 12a may be formed of a single hole. The introduction portion 12a may include a blower for introducing outside air.

The cover member 12 has left and right discharge portions 12 b. The left and right discharge portions 12b are configured to be able to discharge air inside the cover member 12 to the outside.

That is, the cover member 12 has left and right discharge portions 12b capable of discharging the air inside the cover member 12 to the outside.

The left discharge portion 12b is provided on the left side portion of the cover member 12. The right discharge portion 12b is provided on the right side of the cover member 12.

The left discharge portion 12b is located leftward of the running battery 4. The right discharge portion 12b is positioned to the right of the battery 4 for running. That is, the left and right discharge portions 12b are located laterally to the running battery 4.

In the present embodiment, the left and right discharge portions 12b are each formed of a plurality of small holes. However, the present invention is not limited to this, and the left and right discharge portions 12b may be of any other form. For example, the left and right discharge portions 12b may be formed by a single hole. The left and right discharge portions 12b may include a blower for discharging air.

[ arrangement of Water Pump, radiator, Fan ]

As shown in fig. 2 to 4, the tractor a includes a radiator 15 and a water pump 16. The radiator 15 is disposed on the front side of the battery 4 for running.

That is, the tractor a includes a radiator 15 located on the front side of the running battery 4.

A radiator 15 and a water pump 16 are included in the cooling water path in the tractor a. The water pump 16 pumps the cooling water, and thereby the cooling water circulates through the cooling water path. Then, the cooling water is cooled by the radiator 15.

That is, the tractor a includes a water pump 16 that pumps the cooling water passing through the radiator 15.

The water pump 16 is disposed in front of the motor M and below the inverter 14. The water pump 16 is supported by the first plate-like member 54.

The tractor a further includes a cooling fan 17. The cooling fan 17 is disposed in front of the running battery 4. That is, cooling fan 17 is located on the front side of battery 4 for running.

When the cover member 12 is in the closed state, the heat sink 15 and the cooling fan 17 are housed in the cover member 12.

That is, the tractor a includes the cover member 12 that houses the cooling fan 17 and the running battery 4.

The cooling fan 17 is disposed in the vertical direction of the machine body so as to straddle the battery 4 for running and the ventilation space S. The cooling fan 17 is disposed in the vertical direction of the machine body so as to straddle the battery 4 for running and the inverter 14.

Then, the cooling fan 17 sends cooling air to the rear side. Thus, the outside air is introduced into the cover member 12 through the introduction portion 12a and passes through the heat sink 15. As a result, the radiator 15 is cooled.

That is, cooling fan 17 cools radiator 15 and is located on the front side of battery 4 for running.

The cooling air is sent to the front portion of the battery 4 for running and the ventilation space S by the cooling fan 17.

That is, the tractor a includes a cooling fan 17 disposed in front of the running battery 4 and configured to send cooling air to the running battery 4.

At least a part of the cooling air sent from cooling fan 17 to the front portion of battery 4 for running bypasses to the left and right of battery 4 for running and is discharged from left and right discharge portions 12 b. Thereby, the front and lateral portions of the running battery 4 are cooled.

Part of the cooling air sent from the cooling fan 17 to the ventilation space S reaches the first space S1, and then passes through the left and right ventilation openings K and the left and right discharge portions 12b and is discharged to the outside of the cover member 12.

Thereby, the lower portion of the running battery 4 and the inverter 14 are cooled.

In addition, the other part of the cooling air sent from the cooling fan 17 to the ventilation space S reaches the first space S1, and then flows directly through the ventilation space S and passes through the second space S2.

Thereby, the lower portion of the running battery 4, the inverter 14, and the motor M are cooled.

[ Structure relating to wind deflector ]

As shown in fig. 2, a plate-like partition member 56 in a horizontal posture is provided between the battery support portion 53 and the motor M.

The plate-like partition member 56 has wind direction plates 56 a. The wind direction plate 56a is formed by bending a front end portion of the plate-like partition member 56 downward. Therefore, the wind direction plate 56a is in a vertical posture. Thereby, the wind direction plate 56a faces the cooling fan 17.

That is, the tractor a includes the wind direction plate 56a in a posture facing the cooling fan 17.

The wind direction plate 56a is disposed in front of the second space S2 below the running battery 4.

Accordingly, of the cooling air flowing through the ventilation space S, the cooling air flowing toward the second space S2 is guided by the wind direction plate 56a to a position below the wind direction plate 56 a. This makes the cooling air easily flow toward the motor M. As a result, the motor M is cooled well by the cooling air.

[ arrangement of storage battery, voltage converter, etc. for auxiliary machine ]

As shown in fig. 3 to 5, the tractor a includes a reserve tank 5 for the radiator 15. The reserve tank 5 can store cooling water. Further, reserve tank 5 is disposed on the front side of battery 4 for running on the right side of radiator 15.

As shown in fig. 2 to 5, the tractor a includes an auxiliary battery 18 and a voltage converter 19. The auxiliary battery 18 supplies electric power to various auxiliary devices such as the cooling fan 17.

Further, electric power is supplied from the running battery 4 to the voltage converter 19. The voltage converter 19 steps down the electric power from the running battery 4 and supplies the electric power to the auxiliary battery 18.

That is, the tractor a includes a voltage converter 19, and the voltage converter 19 is disposed on the front side of the battery 4 for running, and steps down the electric power from the battery 4 for running to supply the electric power to the battery 18 for auxiliary machinery.

The auxiliary battery 18 and the voltage converter 19 are disposed on the front side of the running battery 4 and on the right side of the radiator 15. The voltage converter 19 is disposed such that the longitudinal direction of the voltage converter 19 is along the vertical direction of the body.

As shown in fig. 3, the voltage converter 19 and the heat sink 15 are arranged in a horizontal direction in a plan view. The heat sink 15, the voltage converter 19, and the auxiliary battery 18 are arranged in a lateral direction in a plan view.

Further, the voltage converter 19 is disposed at a position sandwiched between the radiator 15 and the auxiliary battery 18 in a plan view.

The heat sink 15, the voltage converter 19, and the reserve tank 5 are arranged in a horizontal direction in a plan view.

Further, voltage converter 19 is disposed at a position sandwiched between radiator 15 and reserve tank 5 in a plan view.

As shown in fig. 3 and 4, reserve tank 5 is disposed above auxiliary battery 18. The reserve tank 5 and the auxiliary battery 18 are arranged in the vertical direction of the machine body.

As shown in fig. 2 and 3, the tractor a includes an oil cooler CL. The working oil in the tractor a is cooled by the oil cooler CL.

[ Structure relating to radiator frame ]

As shown in fig. 2, 3, and 5, the radiator 15 is supported by a gate-shaped radiator frame 57. The heat sink frame 57 is disposed so as to surround the heat sink 15.

That is, the tractor a includes a gate-shaped radiator frame 57 that is disposed so as to surround the radiator 15 and supports the radiator 15.

The radiator support frame 57 includes a left side plate 57a, a top plate 57b, a right side plate 57c, a first top plate support portion 57d, and a second top plate support portion 57 e.

The left side plate 57a is located at the left portion of the radiator frame 57. The top plate 57b is located at an upper portion of the radiator frame 57. The right side plate 57c is located at the right portion of the radiator frame 57.

The left plate 57a and the right plate 57c are arranged in a state of being arranged in the left-right direction in a vertical posture. The left side plate 57a and the right side plate 57c are disposed in a posture facing each other.

The first ceiling supporting portion 57d is provided extending leftward from the upper end of the left side plate 57 a. The second ceiling supporting portion 57e is provided to extend rightward from the upper end of the right side plate 57 c. The top plate 57b is placed on and supported by the upper surface of the first top plate support portion 57d and the upper surface of the second top plate support portion 57 e.

The voltage converter 19 is mounted on the radiator frame 57. More specifically, the voltage converter 19 is mounted on the right side of the right side plate 57 c.

The tractor a further includes a first hose 6a (corresponding to a "cooling water hose" in the present invention), a second hose 6b, a water supply unit 6c, and a third hose 6 d. The first hose 6a, the second hose 6b, the water supply portion 6c, and the third hose 6d are included in a cooling water path in the tractor a.

One end of the first hose 6a is connected to the radiator 15. The other end of the first hose 6a is connected to the water supply unit 6 c.

That is, the tractor a includes the first hose 6a connected to the radiator 15.

One end of the second hose 6b is connected to the water supply unit 6 c. The other end of the second hose 6b is connected to a voltage converter 19.

The third hose 6d is connected to the voltage converter 19.

The operator can supply the cooling water to the water supply portion 6 c. The cooling water flows through the third hose 6d, the voltage converter 19, the second hose 6b, the water supply unit 6c, the first hose 6a, and the radiator 15 in this order.

As shown in fig. 2, 3, and 5, the tractor a includes a support portion 7 and a cover support member 58. The support portion 7 is supported by the radiator frame 57. The support portion 7 extends upward from the upper portion of the radiator frame 57.

That is, the tractor a includes a support portion 7 extending upward from the upper portion of the radiator frame 57.

The cover support member 58 is a rod-shaped member. One end of the cover support member 58 is connected to the upper end of the support portion 7 so as to be vertically swingable around a swing axis P along the front-rear direction of the machine body.

When the cover support member 58 is swung upward and is in a standing state and the cover member 12 is in an open state, the other end portion of the cover support member 58 can abut against the inner wall surface of the cover member 12. Then, the other end portion of the cover support member 58 is brought into contact with the inner wall surface of the cover member 12, whereby the cover member 12 is supported by the cover support member 58.

With this structure, the cover support member 58 can support the cover member 12 in the opened state.

That is, the tractor a includes a cover support member 58 coupled to the upper end of the support portion 7 and capable of supporting the cover member 12 in an open state.

When the cover member 12 is in the closed state, the voltage converter 19, the first hose 6a, the radiator frame 57, the reserve tank 5, and the auxiliary battery 18 are housed in the cover member 12.

That is, the tractor a includes the cover member 12 that houses the voltage converter 19, the radiator 15, the first hose 6a, and the radiator frame 57 and can be opened and closed.

The support portion 7 has a first portion 71, a second portion 72, and a third portion 73.

The first portion 71 extends upward from the upper portion of the radiator frame 57. The lower end of the first portion 71 is connected to the upper portion of the radiator frame 57.

The second portion 72 extends forward from the middle portion of the first portion 71 in the vertical direction of the body. The second portion 72 is in a horizontal position.

The third portion 73 extends downward from the front end of the second portion 72, and is connected to the upper portion of the radiator frame 57. The third portion 73 is in a posture of low front and high rear. The rear end of the third portion 73 is connected to the front end of the second portion 72. The front end of the third portion 73 is connected to the upper portion of the radiator frame 57.

That is, the support portion 7 has: a first portion 71 extending upward from the upper portion of the radiator frame 57, a second portion 72 extending forward from the middle portion of the first portion 71 in the vertical direction of the machine body, and a third portion 73 extending downward from the front end portion of the second portion 72 and connected to the upper portion of the radiator frame 57.

The first tube 6a is disposed in a state of passing through an area AR surrounded by the first portion 71, the second portion 72, and the third portion 73.

Here, the first portion 71 is described in detail, and the first portion 71 includes a support stay 71a and a vertical fixing portion 71 b. The support stay 71a is a long plate-like member and extends in the vertical direction of the machine body in a posture along the left side plate 57 a. The lower end of the support stay 71a is fixed to the rear end of the upper end of the left side plate 57a by a bolt.

The vertical fixing portion 71b is a long plate-like member extending in the vertical direction of the machine body. In addition, the length of the vertical fixing portion 71b is shorter than the length of the support stay 71a in the vertical direction of the machine body.

The vertical fixing portion 71b is fixed to the left surface of the support stay 71a in a posture perpendicular to the support stay 71 a. The vertical fixing portion 71b, the second portion 72, and the third portion 73 are integrally formed.

The area AR is surrounded by the support stay 71a, the second portion 72, and the third portion 73.

As shown in fig. 2 to 5, a horizontal support plate SP is provided at the front of the tractor a. The radiator 15, the cooling fan 17, the auxiliary battery 18, the voltage converter 19, the radiator frame 57, and the oil cooler CL are supported by the support plate SP.

[ Structure relating to Hydraulic Pump ]

As shown in fig. 1 and 2, the tractor a includes a hydraulic pump 60. The hydraulic pump 60 supplies hydraulic oil to the working mechanism that operates the tilling device 13. The tilling device 13 can be operated by controlling the supply of the working oil.

More specifically, the tractor a has an elevating mechanism 36 as an operating mechanism of the working device. The hydraulic pump 60 supplies the hydraulic oil to the elevating mechanism 36. Thereby, the elevating mechanism 36 operates. Then, the tilling device 13 is lifted and lowered by the operation of the lifting mechanism 36. The drive part of the tilling part 13a of the tilling device 13 is connected to the PTO shaft 37 of the tractor a, and tilling operation can be performed by the power thereof.

As shown in fig. 2, 4, and 6, the hydraulic pump 60 is disposed adjacent to the motor M.

As shown in fig. 2, the motor M is supported by the front support frame 50 and the rear support frame 59.

The front support frame 50 is provided so as to straddle the left and right main frames 20. The front support frame 50 is fixed to the lower portion of the left and right main frames 20. In addition, the front support frame 50 is located below the front of the motor M. Also, the front support frame 50 supports the front of the motor M.

The rear support frame 59 is provided so as to straddle the left and right main frames 20. In addition, the rear support frame 59 contacts the rear end of the motor M. Also, the rear support frame 59 supports the rear of the motor M.

As shown in fig. 2 and 6, the hydraulic pump 60 is attached to the rear support frame 59 from the front side. Thereby, the hydraulic pump 60 is supported by the rear support bracket 59.

That is, the motor M and the hydraulic pump 60 are supported by a common rear support frame 59.

As shown in fig. 6, a first rotating body 64 is attached to the motor output shaft 61 as the output shaft of the motor M. The first rotating body 64 rotates integrally with the motor output shaft 61.

That is, the tractor a includes the first rotating body 64 attached to the motor output shaft 61 and rotating integrally with the motor output shaft 61.

Further, a second rotating body 65 is attached to a pump input shaft 62 as an input shaft of the hydraulic pump 60. The second rotating body 65 rotates integrally with the pump input shaft 62.

That is, the tractor a includes the second rotating body 65 attached to the pump input shaft 62 as an input shaft of the hydraulic pump 60 and rotating integrally with the pump input shaft 62.

Further, the annular rolling body 66 is wound around the first rolling body 64 and the second rolling body 65.

That is, the tractor a includes a toroidal rotating body 66 wound around the first rotating body 64 and the second rotating body 65.

In the present embodiment, the toroidal rotating body 66 is a belt. However, the present invention is not limited thereto, and the ring rotator 66 may not be a belt. For example, the ring rotator 66 may be a chain.

With the above configuration, the driving force of the motor M is transmitted to the hydraulic pump 60 via the motor output shaft 61, the first rotating body 64, the toroidal rotating body 66, the second rotating body 65, and the pump input shaft 62. Thereby, the hydraulic pump 60 is driven.

That is, the tractor a includes a hydraulic pump 60 that is driven by the motor M and supplies working oil to the tilling device 13.

The transmission input shaft 63, which is an input shaft of the transmission T, is coupled to the motor output shaft 61 via the coupling portion 8. Thereby, the transmission input shaft 63 and the motor output shaft 61 rotate integrally.

Specifically, as shown in fig. 7, the motor output shaft 61 and the transmission input shaft 63 are both formed in a cylindrical shape and extend in the front-rear direction of the machine body. The coupling portion 8 includes a coupling shaft 81 and a pin 82.

The connecting shaft 81 extends in the front-rear direction of the machine body. The distal end portion of the coupling shaft 81 is inserted into the motor output shaft 61 and spline-fitted to the motor output shaft 61. The rear end of the coupling shaft 81 is inserted into the transmission input shaft 63 and spline-fitted to the transmission input shaft 63.

A pin hole 63a is formed in the transmission input shaft 63. Further, the pin 82 is inserted into the pin hole 63 a. In this state, the pin 82 is located behind the coupling shaft 81. The pin 82 prevents the connecting shaft 81 from sliding rearward.

In the state shown on the left side of the paper of fig. 7, the transmission input shaft 63 and the motor output shaft 61 cannot rotate relative to each other.

That is, the tractor a includes a coupling portion 8 that couples the transmission input shaft 63 and the motor output shaft 61 in a state in which the transmission input shaft 63 and the motor output shaft 61 cannot rotate relative to each other.

As shown in fig. 7, the coupling portion 8 is configured to be able to change its state between a coupled state and an uncoupled state. The coupled state is a state in which the transmission input shaft 63 and the motor output shaft 61 are coupled to each other. The non-coupled state is a state in which the transmission input shaft 63 and the motor output shaft 61 are not coupled to each other.

In the state shown on the left side of the drawing sheet of fig. 7, the coupling portion 8 is in the coupled state. At this time, as described above, the transmission input shaft 63 and the motor output shaft 61 cannot rotate relative to each other. Therefore, the transmission input shaft 63 rotates integrally with the motor output shaft 61.

That is, when the coupling portion 8 is in the coupled state, the transmission input shaft 63 and the motor output shaft 61 rotate integrally.

Then, the pin 82 is pulled out from the pin hole 63a, and the coupling shaft 81 is slid rearward, whereby the coupling portion 8 is in a state shown on the right side of the drawing sheet of fig. 7. In the state shown on the right side of the drawing sheet of fig. 7, the coupling portion 8 is in a non-coupled state.

At this time, the coupling shaft 81 is separated from the motor output shaft 61. A gap G is formed between the front end of the coupling shaft 81 and the rear end of the motor output shaft 61.

The gap G is located between the front end of the transmission input shaft 63 and the rear end of the motor output shaft 61. Further, the width of the gap G is larger than the width of the ring rotator 66. Thus, when the toroidal rotation body 66 is detached from the first rotation body 64 or the second rotation body 65, the toroidal rotation body 66 can pass through the gap G.

That is, when the coupling portion 8 is in the uncoupled state, a gap G through which the detached toroidal rotating body 66 can pass is formed between the front end of the transmission input shaft 63 and the rear end of the motor output shaft 61.

[ Structure of the first rotating body ]

As shown in fig. 7, the first rotating body 64 includes a first divided body 67 and a second divided body 68. The first split 67 is located forward of the second split 68. As shown on the left side of the sheet of fig. 7, the front side surface of the second divided body 68 contacts the rear side surface of the first divided body 67.

The first divided body 67 has a winding portion 67a and a flange portion 67 b. The winding portion 67a is configured to be able to wind the toroidal rotating body 66. The flange portion 67b is located at the distal end of the first divided body 67. Further, the flange portion 67b protrudes in the radial direction.

The second segment 68 is formed in a disc shape. The second divided body 68 is fixed to the rear end of the winding portion 67a by a plurality of fixing bolts 69. The outer diameter of the second divided body 68 is the same as the outer diameter of the flange portion 67 b.

According to this configuration, as shown on the right side of the drawing sheet of fig. 7, the second split body 68 can be removed by removing the plurality of fixing bolts 69. In addition, in a state where the second divided body 68 is detached, the toroidal rotating body 66 can be easily detached from the first rotating body 64 by moving the toroidal rotating body 66 to the rear side.

When the coupling portion 8 is in the non-coupled state, the operator can easily detach the toroidal rotating body 66 from the tractor a by detaching the toroidal rotating body 66 from the first rotating body 64 and passing it through the gap G.

When the toroidal rotating body 66 is attached to the tractor a, the worker winds the toroidal rotating body 66 around the winding portion 67a through the gap G, and then brings the state shown on the left side of the paper surface in fig. 7. This makes it possible to easily attach the endless rotating body 66 to the tractor a.

[ Structure relating to tension adjusting mechanism ]

As shown in fig. 8, the tractor a includes a tension adjustment mechanism 9. The tension adjusting mechanism 9 includes a tension pulley 91, a long connecting member 92, and an adjusting portion 93.

The tension pulley 91 abuts against the ring rotator 66 and applies tension to the ring rotator 66. The tension pulley 91 is supported by the frame 2 via a connecting member 92.

The adjustment unit 93 is configured to be manually operable. By manually operating the adjustment portion 93, the connection member 92 moves in the longitudinal direction of the connection member 92. Then, the tension pulley 91 moves in the longitudinal direction of the connection member 92 along with the movement of the connection member 92. Thereby, the tension of the ring rotator 66 is changed.

With the above configuration, the tension adjusting mechanism 9 is configured to be able to adjust the tension of the toroidal rotating body 66 by a manual operation.

That is, the tractor a includes the tension adjusting mechanism 9 that can adjust the tension of the toroidal rotating body 66 by a manual operation.

As shown in fig. 1, 2, and 8, the cab 3 includes a wall portion 34 and an opening cover member 35.

The wall portion 34 is provided to separate the driver seat 31 from the toroidal rotating body 66 and the tension adjusting mechanism 9. Further, an opening 34a is formed in the wall portion 34 at a position near the tension adjusting mechanism 9. Further, the opening 34a is located in the vicinity of the front end portion of the floor 33.

The opening cover member 35 is provided in a state of closing the opening 34 a. The opening cover member 35 is configured to be detachable. By removing the opening cover member 35, the opening 34a is opened. Further, the opening 34a is closed by attaching the opening cover member 35.

Specifically, the opening cover member 35 is attached to the wall 34 by a bolt b 1. Then, the opening cover member 35 can be detached by detaching the bolt b 1. In fig. 8, only one bolt b1 is shown, but the number of bolts b1 may be any number, including one or more.

That is, the cab 3 includes a wall portion 34 that separates the cab seat 31 from the toroidal rotating body 66 and the tension adjusting mechanism 9. The cab 3 also has an opening cover member 35 that can open and close the opening 34 a.

The present invention is not limited to this, and the opening cover member 35 may be attached to the wall portion 34 without using the bolt b 1. For example, the opening cover member 35 may be attached to the wall 34 by forming a convex portion on the opening cover member 35 and a concave portion on the wall 34 and fitting the convex portion and the concave portion.

The operator can easily reach the adjustment portion 93 through the opening 34a by detaching the opening cover member 35.

According to the above-described configuration, the voltage converter 19 and the heat sink 15 are arranged in a lateral direction in a plan view. Therefore, the cooling air is supplied in parallel to the voltage converter 19 and the radiator 15 as the tractor a travels. That is, the cooling air supplied to one of the voltage converter 19 and the radiator 15 is not blocked by the other of the voltage converter 19 and the radiator 15.

This makes it possible to achieve both satisfactory cooling of the voltage converter 19 and satisfactory cooling of the radiator 15.

In the above-described configuration, the voltage converter 19 and the radiator 15 are collectively disposed on the front side of the battery 4 for running. This makes it easy to maintain both the voltage converter 19 and the radiator 15. Therefore, maintenance work is easily performed.

That is, with the above-described configuration, it is possible to realize the tractor a that can perform maintenance work easily while achieving both good cooling of the voltage converter 19 and good cooling of the radiator 15.

The above-described embodiments are merely examples, and the present invention is not limited thereto and can be modified as appropriate.

[ other embodiments ]

(1) The number of the first support frames 51 may be one, or three or more.

(2) The number of the second support frames 52 may be one, or three or more.

(3) The number of the ventilation openings K may be one or more than three.

(4) The number of the discharge portions 12b may be one, or three or more.

(5) One ventilation opening may be provided in the cover member 12, and the ventilation opening may also serve as the introduction portion 12a and the discharge portion 12 b.

(6) The second portion 72 may not be in a horizontal position. For example, the second portion 72 may be in a posture of high front and low back, or in a posture of low front and high back.

(7) The third portion 73 may not be in a posture of low front and high back. For example, the third portion 73 may be in a vertical posture, or may be in a posture extending rearward and downward from the front end portion of the second portion 72.

(8) The coupling shaft 81 may be configured to be slidable forward. In this case, the gap G may be formed between the rear end of the coupling shaft 81 and the front end of the transmission input shaft 63.

(9) The front end of the coupling shaft 81 may be configured to move rearward relative to the front end of the transmission input shaft 63 by sliding the coupling shaft 81 rearward. In this case, the gap G may be formed between the rear end of the motor output shaft 61 and the front end of the transmission input shaft 63.

(10) The second divided body 68 may be fixed to the rear end of the winding portion 67a by a single fixing bolt 69.

(11) The second divided body 68 may be fixed to the rear end of the winding portion 67a without using the fixing bolt 69. For example, the second segment 68 may be fixed to the rear end of the winding portion 67a by forming a convex portion in the first segment 67 and a concave portion in the second segment 68 and fitting the convex portion and the concave portion into each other.

(12) The outer diameter of the second divided body 68 may be different from the outer diameter of the flange portion 67 b.

(13) The motor M may not be in contact with the ventilation space S.

(14) The tractor a may be provided with an engine and configured as a hybrid type.

(15) The wind direction plate 56a may not be provided.

(16) The plate-like partition member 56 may not be provided.

(17) The second space S2 may not be formed between the motor M and the battery 4 for running.

(18) The second space S2 may not be included in the ventilation space S. That is, the second space S2 and the ventilation space S may be partitioned.

(19) The first space S1 may not be formed between the inverter 14 and the running battery 4.

(20) The first space S1 may not be included in the ventilation space S. That is, the first space S1 and the ventilation space S may be partitioned.

(21) The cover member 12 may not be provided.

(22) Some or all of the battery 4 for running, the reserve tank 5, the first hose 6a, the radiator 15, the cooling fan 17, the battery 18 for auxiliary equipment, the voltage converter 19, and the radiator frame 57 may not be housed in the cover member 12.

(23) The discharge portion 12b may not be provided.

(24) The introduction portion 12a may not be provided.

(25) The discharge portion 12b may be provided at a position other than the lateral side of the running battery 4. For example, the discharge portion 12b may be provided on the rear side of the running battery 4.

(26) The first plate-like member 54 may not be provided.

(27) The second plate-like member 55 may not be provided.

(28) The first plate-like member 54 may not be in a horizontal posture. For example, the first plate-like member 54 may be inclined high front-low back or high front-high back.

(29) The second plate-like member 55 may not be in a horizontal posture. For example, the second plate-like member 55 may be inclined so as to be high in front-low rear-high or high in front-high rear-low.

(30) The ventilation space S may not communicate with the ventilation opening K.

(31) The ventilation opening K may not be formed.

(32) The first support frame 51 may not be provided upright on the chassis 2.

(33) The second support frame 52 may not be provided upright on the frame 2.

(34) The first support frame 51 may not be provided.

(35) The second support frame 52 may not be provided.

(36) The first tube 6a may be disposed so as not to pass through the area AR surrounded by the first portion 71, the second portion 72, and the third portion 73. For example, the first tube 6a may be disposed so as to pass through a position on the front side of the third portion 73.

(37) The support portion 7 may not have the second portion 72 and the third portion 73.

(38) The cover support member 58 may not be provided.

(39) The support portion 7 may not be provided.

(40) Some or all of the first hose 6a, the second hose 6b, the water supply portion 6c, and the third hose 6d may not be provided.

(41) The voltage converter 19 may be disposed in a state where the longitudinal direction of the voltage converter 19 is along the front-rear direction of the body, or may be disposed in a state where the longitudinal direction of the voltage converter 19 is along the left-right direction of the body.

(42) The voltage converter 19 may not be mounted on the radiator frame 57.

(43) The radiator frame 57 may not be provided.

(44) The reserve tank 5 and the auxiliary battery 18 may not be arranged in the vertical direction of the machine body. For example, the reserve tank 5 and the auxiliary battery 18 may be arranged in the right-left direction of the machine body.

(45) The heat sink 15, the voltage converter 19, and the reserve tank 5 may not be arranged in a horizontal direction in a plan view. For example, the reserve tank 5 may be disposed above the voltage converter 19.

(46) The radiator 15, the voltage converter 19, and the auxiliary battery 18 may not be arranged in a lateral direction in a plan view. For example, the auxiliary battery 18 may be disposed above the voltage converter 19.

(47) The cooling fan 17 may be configured to send cooling air in a direction other than the rear side. For example, the cooling fan 17 may be configured to send cooling air to the front side.

(48) The cooling fan 17 may be disposed above the inverter 14 or below the inverter 14.

(49) The bottom plate portion 53a may not be provided.

(50) The inverter support portion 21 may be located on the right side of the left end position of the left main frame 20.

(51) The inverter support portion 21 may be located on the left side of the right end position of the right main frame 20.

(52) The inverter support portion 21 may not be provided. In this case, the inverter 14 may be directly supported by the left main frame 20 and the right main frame 20.

(53) The inverter 14 may be located on the right side of the left end position of the left main frame 20.

(54) The inverter 14 may be located on the left side of the right end position of the right main frame 20.

(55) The frame 2 may not have the left and right main frames 20. For example, the frame 2 may be formed of a single frame member.

(56) The water pump 16 may be disposed at a position other than the front of the motor M. For example, the water pump 16 may be disposed behind the motor M.

(57) The water pump 16 may be disposed above the inverter 14.

(58) The motor M may be disposed at a position other than a position sandwiched between the left and right main frames 20. For example, the motor M may be disposed above the left and right main frames 20.

(59) The hydraulic pump 60 may not be supported by the rear support frame 59. That is, the motor M and the hydraulic pump 60 may not be supported by the common rear support frame 59.

(60) The opening cover member 35 may be configured not to open and close the opening 34 a. For example, the opening cover member 35 may be configured to be non-detachable.

(61) The opening 34a may not be formed in the wall 34.

(62) The wall portion 34 may not be provided.

(63) The opening cover member 35 may not be provided.

(64) The tension adjusting mechanism 9 may not be provided.

(65) The removed toroidal rotating body 66 may not pass through the gap G.

(66) The coupling portion 8 may be configured so that the state cannot be changed from the coupled state to the uncoupled state.

(67) The coupling portion 8 may not be provided.

(68) The first rotating body 64 and the second rotating body 65 may be both gears and mesh with each other. In this case, the toroidal rotating body 66 may not be provided.

(69) The transmission input shaft 63 may not rotate integrally with the motor output shaft 61. For example, the transmission input shaft 63 and the motor output shaft 61 may be coupled via a plurality of gears.

(70) The transmission T may be disposed at a position other than the rear of the motor M. For example, the transmission T may be disposed in front of the motor M.

(71) Instead of the tilling device 13, various devices such as a fertilizer spreading device, a chemical spraying device, a seeding device, and a harvesting device, and working devices such as a loader and a shovel may be provided.

(72) The wind direction plate 56a may not be in a vertical posture. For example, the wind direction plate 56a may be inclined so as to be high in front-low rear-high or high in front-high rear-low.

(73) The motor M may be disposed at a position other than below the running battery 4. For example, the motor M may be disposed above the running battery 4.

(74) The inverter 14 may be disposed at a position other than below the running battery 4. For example, the inverter 14 may be disposed above the running battery 4.

(75) The cooling fan 17 may be disposed above or below the battery 4 for running, or may be disposed above or below the ventilation space S.

(76) The ventilation space S may not be formed.

(77) The cooling fan 17 may be disposed at a position other than the front of the running battery 4. For example, the cooling fan 17 may be disposed behind the running battery 4.

(78) The running battery 4 may be cooled without cooling air by the cooling fan 17.

(79) The running battery 4 may be disposed at a position overlapping the frame 2 in a side view, or may be disposed at a position lower than the frame 2.

(80) The motor M and the inverter 14 may be arranged in the left-right direction of the machine body, or may be arranged in the up-down direction of the machine body.

(81) The transmission T may be disposed on the front side of the battery 4 for running.

(82) The hydraulic pump 60 may be disposed at a position relatively far from the motor M.

(83) The hydraulic pump 60 may be driven by a power source other than the motor M.

Industrial applicability

The present invention can be used not only for tractors but also for various electric working vehicles such as combine harvesters, rice transplanters, construction work machines, and the like.

Description of the reference numerals

4-run battery

5 storage box

6a first hose (Cooling water hose)

7 support part

10 front wheel (running gear)

11 rear wheel (running gear)

12 cover component

15 radiator

18 auxiliary machine battery

19 voltage converter

57 radiator frame

58 cover support member

71 first part

72 second part

73 third part

A tractor (electric operating vehicle)

AR area

M motor