阅读说明：本技术 作业车 (Working vehicle ) 是由 内山大辅 目野鹰博 岸冈雄介 冈本拓也 茂木博子 于 2020-02-17 设计创作，主要内容包括：具备：发动机(17)和散热器(23),支承于机体的前部；以及电动马达(42),相对于发动机(17)配置于后侧,能对前轮进行转向操作。具备：隔热板(57),以在后视时与电动马达(42)重叠的方式在机体的前后方向上配置于电动马达(42)与发动机(17)之间。(The disclosed device is provided with: an engine (17) and a radiator (23) supported on the front part of the machine body; and an electric motor (42) which is disposed on the rear side of the engine (17) and which can steer the front wheels. The disclosed device is provided with: and a heat shield plate (57) which is disposed between the electric motor (42) and the engine (17) in the front-rear direction of the machine body so as to overlap the electric motor (42) in the rear view.)

1. A work vehicle is characterized by comprising:

an engine and a radiator supported at the front of the body;

an electric motor disposed on the rear side of the engine and capable of steering a front wheel; and

and a heat shield plate disposed between the electric motor and the engine in a front-rear direction of the machine body so as to overlap the electric motor in a rear view.

2. The work vehicle of claim 1,

the insulation panel has an insulation member.

3. Work vehicle according to claim 1 or 2,

the radiator is disposed on the right or left side with respect to the engine,

a fan that introduces air into the radiator and causes the air to flow to an opposite side of the radiator in the vicinity of the engine is arranged along the radiator,

the work vehicle is provided with: a steering wheel column disposed on a rear side of the engine and supporting a steering wheel capable of manually steering the front wheels,

the electric motor is disposed on the fan side with respect to the steering wheel stay in a rear view.

4. The work vehicle according to any one of claims 1 to 3,

the radiator is disposed on the right or left side with respect to the engine,

a fan that introduces air into the radiator and causes the air to flow to an opposite side of the radiator in the vicinity of the engine is arranged along the radiator,

the work vehicle is provided with: and a wind scooper disposed above the engine and configured to guide air flowing near the engine to flow to a side opposite to the radiator.

5. The work vehicle of claim 4,

the wind scooper is formed along a rotation locus of an outer end portion of the fan in a side view.

6. Working vehicle according to claim 4 or 5,

the disclosed device is provided with: a steering wheel column disposed on a rear side of the engine and supporting a steering wheel capable of manually steering the front wheels,

the wind scooper is supported by the steering wheel support.

7. The work vehicle according to any one of claims 4 to 6,

the air cleaner is disposed above the air guide cover in a front view.

8. The work vehicle of claim 7,

the disclosed device is provided with: a steering wheel column disposed on a rear side of the engine and supporting a steering wheel capable of manually steering the front wheels,

right and left support portions extend from the steering wheel column to the front side,

the wind scooper is supported by the steering column by being coupled to the support portion,

the air from the air cleaner is supplied to an intake pipe of the engine, and the intake pipe is connected to the engine across the air cleaner so as to pass between the right and left support portions in a front view and between the air guide cover and the steering wheel support in a side view.

9. The work vehicle of claim 8,

an intake duct that takes air into the air cleaner extends downward from the air cleaner so as to pass between the right and left support portions in a front view and between the air guide cover and the steering wheel stay in a side view, and extends laterally toward the fan side in a rear view.

10. Work vehicle according to claim 8 or 9,

the heat insulation plate is connected with the supporting part,

the wind scooper is coupled to the support portion by being coupled to the heat insulating plate.

11. Work vehicle according to any of claims 1 to 10,

the disclosed device is provided with: a steering wheel column disposed on a rear side of the engine and supporting a steering wheel capable of manually steering the front wheels,

and is provided with: a power steering mechanism that assists steering operation of the front wheels by the steering wheel; and

a steering shaft that is incorporated in the steering column and transmits the operation of the steering wheel to the power steering mechanism,

the electric motor performs a turning operation of the front wheels by performing a turning operation of the steering shaft.

12. The work vehicle of claim 11,

the disclosed device is provided with: a gear mechanism capable of transmitting power of the electric motor to the steering shaft; and a gear case covering the gear mechanism,

the gear case has an upper gear case portion and a lower gear case portion, and an outer peripheral portion of the upper gear case portion and an outer peripheral portion of the lower gear case portion are bolted to each other in a state where the gear mechanism is accommodated between the upper gear case portion and the lower gear case portion.

13. The work vehicle of claim 12,

the electric motor is mounted on an upper surface portion of the upper gear case portion so as to be exposed upward from the gear case.

Technical Field

The present invention relates to a structure in the vicinity of an engine in a working vehicle such as a riding rice transplanter, a riding direct seeder, and a tractor.

Background

As a riding rice transplanter as an example of a working vehicle, there is a riding rice transplanter in which an engine is supported on a front portion of a machine body, and a radiator and a fan are disposed on the right side of the engine in the front-rear direction, as disclosed in patent document 1.

In patent document 1, a heat insulating plate is disposed on the rear side of an engine, and air that has passed through a radiator by the blowing action of a fan is guided by the heat insulating plate to flow to the left side, which is the opposite side of the radiator. The air having passed through the radiator is less likely to flow from the vicinity of the engine to the rear side by the heat shield plate, and the temperature rise of the hydrostatic continuously variable transmission disposed on the rear side of the engine is suppressed.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent application No. 2001 and 199251

Disclosure of Invention

Problems to be solved by the invention

In a working vehicle such as a riding rice transplanter, a function of performing work while automatically traveling along a predetermined work path has been developed, and an electric motor capable of steering a front wheel may be provided for the function of the automatic travel.

In this case, in a working vehicle in which the engine is supported on the front portion of the machine body, the electric motor may be disposed on the rear side of the engine, which is a position close to the front wheels.

The present invention aims to appropriately arrange an electric motor capable of steering a front wheel in a work vehicle by effectively utilizing a structure in which a heat shield plate is arranged on the rear side of an engine.

Means for solving the problems

The work vehicle of the present invention includes: an engine and a radiator supported at the front of the body; an electric motor disposed on the rear side of the engine and capable of steering a front wheel; and a heat shield plate disposed between the electric motor and the engine in a front-rear direction of the machine body so as to overlap the electric motor in a rear view.

According to the present invention, in the working vehicle in which the engine and the radiator are supported on the front portion of the machine body, when the electric motor is disposed on the rear side with respect to the engine, the heat shield plate is disposed between the electric motor and the engine in the front-rear direction of the machine body so as to overlap the electric motor in the rear view, and therefore, even if the heat of the engine flows to the rear side, the heat of the engine is blocked by the shielding plate, and the state of direct contact with the electric motor is reduced.

This suppresses the temperature rise of the electric motor, and improves the durability of the electric motor.

In the present invention, it is preferable that the insulation panel has an insulation member.

According to the present invention, since the heat insulating plate has the heat insulating member, the state in which the heat of the engine directly contacts the electric motor is further reduced, and the durability of the electric motor can be improved.

In the present invention, it is preferable that the radiator is disposed on the right side or the left side with respect to the engine, and a fan that introduces air into the radiator and causes the air to flow to the opposite side of the radiator in the vicinity of the engine is disposed along the radiator, and the work vehicle includes: and a steering wheel stay disposed on a rear side of the engine and supporting a steering wheel that can manually steer the front wheels, wherein the electric motor is disposed on the fan side of the steering wheel stay in a rear view.

According to the present invention, the radiator is disposed on the right side or the left side with respect to the engine, the fan is disposed along the radiator, and air is introduced into the radiator by the air blowing action of the fan, passes through the radiator, and flows to the opposite side of the radiator in the vicinity of the engine.

According to the present invention, the steering wheel support column that supports the steering wheel that can manually steer the front wheels is disposed on the rear side of the engine, and the electric motor is disposed on the fan side of the steering wheel support column and at a position close to the fan in the rear view.

Since the air blowing action of the fan is hardly attenuated at a position close to the fan, the air passing through the radiator easily flows to the opposite side of the radiator and hardly flows to the rear side (electric motor side). At a position close to the fan, even if the air passing through the radiator flows to the rear side (electric motor side), the air is hardly heated by the engine.

With the above configuration, the state in which the heat of the engine directly contacts the electric motor is reduced, and the durability of the electric motor can be improved.

In the present invention, it is preferable that the radiator is disposed on the right side or the left side with respect to the engine, and a fan that introduces air into the radiator and causes the air to flow to the opposite side of the radiator in the vicinity of the engine is disposed along the radiator, and the work vehicle includes: and a wind scooper disposed above the engine and configured to guide air flowing near the engine to flow to a side opposite to the radiator.

According to the present invention, the radiator is disposed on the right side or the left side with respect to the engine, the fan is disposed along the radiator, and air is introduced into the radiator by the air blowing action of the fan, passes through the radiator, and flows through the vicinity of the engine on the opposite side of the radiator.

According to the present invention, since the air guide cover that guides the air flowing near the engine to flow to the opposite side of the radiator is disposed above the engine, the air that has passed through the radiator by the blowing action of the fan does not stay near the engine but flows smoothly to the opposite side of the radiator.

Accordingly, the air passing through the radiator is less likely to flow to the rear side (electric motor side), and the state where the heat of the engine directly contacts the electric motor is reduced, thereby improving the durability of the electric motor.

In the present invention, it is preferable that the wind scooper is formed along a rotation locus of an outer end portion of the fan in a side view.

According to the present invention, since the air guide cover is formed along the rotation locus of the outer end portion of the fan in a side view, the air having passed through the radiator by the blowing action of the fan smoothly flows to the opposite side of the radiator, and the air having passed through the radiator hardly flows to the rear side (electric motor side), so that the state in which the heat of the engine directly contacts the electric motor is reduced, and the durability of the electric motor can be improved.

In the present invention, it is preferable that: and a steering wheel support column disposed on a rear side of the engine and supporting a steering wheel that can manually steer the front wheels, wherein the wind scooper is supported by the steering wheel support column.

According to the present invention, since the steering wheel support column that supports the steering wheel that can manually steer the front wheels is disposed on the rear side with respect to the engine and the wind scooper is supported by the steering wheel support column, the vibration of the engine is not easily transmitted to the wind scooper.

Therefore, the vibration of the wind scooper is suppressed, which is advantageous for preventing the wind scooper from being damaged.

In the present invention, it is preferable that the air cleaner is disposed above the air guide cover in a front view.

According to the present invention, when the air cleaner is disposed in the vicinity of the engine, the air cleaner is disposed above the air guide cover in the front view, and therefore heat of the engine is blocked by the air guide cover and is not easily transmitted to the air cleaner.

This suppresses the temperature rise of the air cleaner, and improves the intake efficiency of the engine.

In the present invention, it is preferable that: and a steering wheel support disposed on a rear side of the engine and supporting a steering wheel that can manually steer the front wheels, wherein right and left support portions extend forward from the steering wheel support, the air guide cover is supported by the steering wheel support by being coupled to the support portions, and air supplied from the air cleaner is supplied to an intake pipe of the engine so as to pass between the right and left support portions in a front view and between the air guide cover and the steering wheel support in a side view, and the air cleaner and the engine are connected to each other across the air cleaner.

According to the present invention, the steering wheel column that supports the steering wheel that can be manually steered with respect to the front wheels is disposed on the rear side with respect to the engine, and the wind scoops are coupled to the right and left support portions that extend from the steering wheel column to the front side.

In the above-described configuration, when the air cleaner is disposed on the upper side with respect to the air guide cover in the front view, according to the present invention, the intake pipe connected so as to straddle the air cleaner and the engine is disposed between the right and left side support portions by effectively utilizing the space between the air guide cover and the steering wheel support, which is advantageous for the compactness of the vicinity of the air cleaner.

In the present invention, it is preferable that the air cleaner includes a fan that is disposed in the air guide cover and that is disposed in the air guide cover, and that the air cleaner includes a fan support that is disposed in the air guide cover and that is disposed in the air guide cover.

According to the present invention, when the suction duct for sucking the outside air into the air cleaner is provided, the suction duct is disposed between the right and left support portions by effectively utilizing the space between the air guide cover and the steering column, which is advantageous for the reduction in the size of the vicinity of the air cleaner.

In the present invention, it is preferable that the heat insulating plate is coupled to the support portion, and the air guide cover is coupled to the support portion by being coupled to the heat insulating plate.

According to the present invention, the support portion extending forward from the steering column is used for both the support of the heat insulating panel and the support of the wind scooper, which contributes to simplification of the structure.

In the present invention, it is preferable that: a steering column disposed on a rear side of the engine and supporting a steering wheel that can manually steer the front wheels, the work vehicle including: a power steering mechanism that assists steering operation of the front wheels by the steering wheel; and a steering shaft that is incorporated in the steering column and transmits an operation of the steering wheel to the power steering mechanism, wherein the electric motor rotates the steering shaft to steer the front wheels.

According to the present invention, in the case where the power steering mechanism for assisting the steering operation of the front wheels by the steering wheel is provided, the power steering mechanism assists the electric motor when the steering shaft is rotated by the electric motor to steer the front wheels, so that the steering operation of the front wheels can be smoothly performed even by the electric motor having a small output.

In the present invention, it is preferable that: a gear mechanism capable of transmitting power of the electric motor to the steering shaft; and a gear case that covers the gear mechanism, the gear case having an upper gear case portion and a lower gear case portion, an outer peripheral portion of the upper gear case portion and an outer peripheral portion of the lower gear case portion being bolted to each other in a state where the gear mechanism is accommodated between the upper gear case portion and the lower gear case portion.

As described above, in the case where the steering shaft is configured to be rotated by the electric motor, a gear mechanism capable of transmitting the power of the electric motor to the steering shaft is often provided.

According to the present invention, since the gear mechanism is accommodated in the gear case in a substantially sealed state by the gear case having the upper gear case portion and the lower gear case portion, the gear mechanism is protected from mud, water, and the like.

In the present invention, it is preferable that the electric motor is attached to an upper surface portion of the upper gear case portion so as to be exposed upward from the gear case.

According to the present invention, when mud, water, or the like on the ground jumps upward and splashes around the electric motor, mud, water, or the like easily hits a gear box (lower gear box portion) located below the electric motor, and thus is less likely to hit the electric motor, which is advantageous for protecting the electric motor.

Drawings

Fig. 1 is a left side view of the riding type rice transplanter.

Fig. 2 is a plan view of the riding type rice transplanter.

Fig. 3 is a vertical left side view showing the inside of the engine cover.

Fig. 4 is an exploded perspective view showing the inside of the engine cover.

Fig. 5 is a plan view showing the inside of the engine cover.

Fig. 6 is a vertical right side view showing the inside of the engine cover.

Fig. 7 is an exploded perspective view of the wind scooper and the vicinity of the steering column.

Fig. 8 is a front view of the vicinity of the steering wheel post and the heat shield.

Fig. 9 is a rear view of the vicinity of the steering wheel post and the heat shield.

Fig. 10 is an exploded perspective view of the vicinity of the steering wheel column.

Fig. 11 is an exploded perspective view of the gear box and gear mechanism.

Fig. 12 is a longitudinal sectional front view of the gear case and the gear mechanism.

Fig. 13 is a cross-sectional top view of the detection member and the steering shaft.

Detailed Description

Fig. 1 to 13 show a riding type rice transplanter as an example of a working vehicle, and in fig. 1 to 13, F denotes a front direction, B denotes a rear direction, U denotes an upper direction, D denotes a lower direction, R denotes a right direction, and L denotes a left direction.

(riding type transplanter Integrated Structure)

As shown in fig. 1, in a riding type rice transplanter, a link mechanism 4 extending rearward is supported to be vertically swingable at the rear of a machine body 3 provided with right and left front wheels 1 and right and left rear wheels 2, a hydraulic cylinder 5 for vertically lifting and lowering the link mechanism 4 is provided, and a seedling planting device 6 is supported at the rear of the link mechanism 4.

As shown in fig. 1 and 3, the body 3 includes right and left body frames 7 arranged in the front-rear direction, a transmission case 8 coupled to a front portion of the body frames 7, a support frame 9 coupled to a front portion of the transmission case 8, and the like.

As shown in fig. 1, 3, and 6, the right and left front axle boxes 10 are coupled to the right and left portions of the transmission 8, and the right and left front wheels 1 are rotatably supported by the front axle boxes 10. The rear axle box 11 is supported by the rear portion of the body frame 7, and the right and left rear wheels 2 are supported by the rear axle box 11.

(Structure of seedling transplanting device)

As shown in fig. 1 and 2, the seedling planting device 6 is provided with a planting transmission case 12, a rotating case 13, a planting arm 14, a floating plate 15, a seedling stage 16, and the like.

The four implant transmission cases 12 are arranged in a left-right direction, a rotation case 13 is rotatably supported at a right portion and a left portion of a rear portion of the implant transmission case 12, and implant arms 14 are supported at both end portions of the rotation case 13. The seedling stage 16 is supported so as to be movable in the right-left direction.

As the seedling carrying table 16 is driven to be fed laterally in the left-right direction, the rotary box 13 is driven to rotate, and the transplanting arms 14 alternately take out seedlings from the lower portion of the seedling carrying table 16 and transplant the seedlings to the field surface.

(Transmission from engine to continuously variable Transmission)

As shown in fig. 3, 4, and 6, the support frame 9 is provided with right and left vertical-wall-shaped lateral portions 9a, a plurality of frames 9b connected across the right and left lateral portions 9a, and the like, and is formed in a rectangular frame shape in plan view.

The engine 17 is supported by the frame 9b of the support frame 9 via the vibration-proof rubber 18, and the engine 17 is disposed in a lying state such that a crankshaft (not shown) of the engine 17 extends in the left-right direction.

As shown in fig. 1, 3, and 5, an output shaft 17a of the engine 17 projects leftward, and an output pulley 17b is attached to the output shaft 17a of the engine 17. A hydrostatic continuously variable transmission 19 is connected to an upper portion of the left portion of the transmission case 8. The input shaft 19a of the continuously variable transmission 19 extends leftward, and an input pulley 19b and a fan 19c are mounted on the input shaft 19a of the continuously variable transmission 19.

The tension arm 20 is supported on the left lateral side 9a of the support frame 9 so as to be vertically swingable, the tension pulley 21 is supported on an end of the tension arm 20, and a spring (not shown) for biasing the tension arm 20 upward is provided.

The transmission belt 22 is mounted so as to straddle the output pulley 17b of the engine 17 and the input pulley 19b of the continuously variable transmission 19, and the tension pulley 21 is pressed upward toward the lower side portion of the transmission belt 22 to maintain the tension of the transmission belt 22.

The output pulley 17b of the engine 17 is rotationally driven in the counterclockwise direction in fig. 3 by the power of the engine 17, the power of the engine 17 is transmitted to the input pulley 19b of the continuously variable transmission 19 via the output pulley 17b of the engine 17 and the transmission belt 22, and the input pulley 19b of the continuously variable transmission 19 is rotationally driven in the counterclockwise direction in fig. 3.

The fan 19c is rotationally driven together with the input pulley 19b of the continuously variable transmission 19, and the cooling air generated by the fan 19c of the continuously variable transmission 19 flows from the left side to the right side and is sent to the continuously variable transmission 19 and the transmission 8.

(Transmission system from continuously variable transmission to front and rear wheels, seedling transplanting device)

The continuously variable transmission 19 is configured to be continuously variable from a neutral position to a forward side and a reverse side.

The power of an output shaft (not shown) of the continuously variable transmission 19 is transmitted to the right and left front wheels 1 via a geared sub-transmission (not shown) inside the transmission case 8, a front wheel differential mechanism (not shown), and a transmission shaft (not shown) inside the right and left front axle boxes 10. The power of the subtransmission is transmitted to the rear axle box 11 via a transmission shaft (not shown), and transmitted to the right and left rear wheels 2 via a transmission shaft (not shown) inside the rear axle box 11.

The power branched from between the output shaft of the continuously variable transmission 19 and the sub-transmission is transmitted to the seedling planting device 6 via a planting distance transmission (not shown), a planting clutch (not shown) and a transmission shaft (not shown) inside the transmission case 8.

(related structures of engine and radiator)

As shown in fig. 3 to 6, the radiator 23 is disposed on the right side in the front-rear direction with respect to the engine 17, and is supported by the right lateral side portion 9a of the support frame 9. The engine 17 and the radiator 23 are supported by the support frame 9 and are supported by the front portion of the machine body 3.

The output shaft 17a of the engine 17 extends not only to the left but also to the right. A drive pulley 17c is mounted on the output shaft 17a of the engine 17, and the drive pulley 17c of the engine 17 is disposed between the engine 17 and the radiator 23.

A water pump 27 for circulating cooling water is provided across the engine 17 and the radiator 23, and the water pump 27 is supported at the right portion of the upper portion of the engine 17. The fan 24 is mounted on the pulley 27a of the water pump 27, and the fan 24 is disposed between the engine 17 and the radiator 23 along the radiator 23.

The alternator 25 is supported on the right portion of the upper portion of the engine 17. A drive belt 26 is fitted over the drive pulley 17c of the engine 17, the pulley 27a (fan 24) of the water pump 27, and the pulley 25a of the alternator 25.

The exhaust pipe 28 extends downward from the front of the engine 17 and extends outward (leftward) with respect to the left lateral portion 9a of the support frame 9. The muffler 29 is connected to the exhaust pipe 28, and the muffler 29 is supported by the support member 69 so as to be disposed on the outer side (left side) in the front-rear direction with respect to the left lateral portion 9a of the support frame 9.

As shown in fig. 1, 2, 3, and 6, an engine cover 30 is provided to cover the engine 17, the radiator 23, and the like. Openings 30a are opened in the right and left portions of the engine cover 30, and a dust screen (not shown) is attached to the opening 30a of the engine cover 30.

The driving pulley 17c of the engine 17 is rotationally driven in the clockwise direction of fig. 6 by the power of the engine 17, the water pump 27 and the alternator 25 are driven, and the fan 24 is rotationally driven in the clockwise direction of fig. 6.

The air is sucked from the right opening 30a of the hood 30 by the suction and blowing action of the fan 24, is introduced into the radiator 23, flows through the vicinity of the engine 17 to the left side, which is the opposite side of the radiator 23, and is discharged to the outside from the left opening 30a of the hood 30.

(steering wheel column and power steering mechanism related Structure)

As shown in fig. 3 and 6, the power steering mechanism 31 is coupled to an upper portion of the transmission case 8. The base plate 32 is coupled to an upper portion of the power steering mechanism 31, and the gear box 33 is coupled to the base plate 32. The steering column 34 is coupled to the gear case 33.

As shown in fig. 8, 9, 10, and 12, the steering wheel support column 34 includes a base plate 34a connected to the upper gear box portion 33a of the gear box 33, an intermediate portion 34b having three leg portions connected to the base plate 34a, and a tubular pipe portion 34c connected to the intermediate portion 34b and extending upward.

The steering shaft 35 is incorporated in the steering column 34 and the gear box 33, is supported rotatably in the vertical direction, and is connected to the power steering mechanism 31 with the lower portion of the steering shaft 35 inserted into the power steering mechanism 31. A steering wheel 36 is fitted to an upper end portion of a steering shaft 35 that extends from an upper end portion of a tube portion 34c of the steering column 34.

As shown in fig. 3 to 6, the steering column 34 and the power steering mechanism 31 are disposed on the rear side with respect to the engine 17 in side view. When the operator manually operates the steering wheel 36, the operation of the steering wheel 36 is transmitted to the power steering mechanism 31 via the steering shaft 35, the front wheels 1 are steered, and the steering operation of the front wheels 1 by the steering wheel 36 is assisted by the power steering mechanism 31.

As shown in fig. 9 and 12, the steering wheel support 34 is coupled to the gear case 33, and the gear case 33 is coupled to the power steering mechanism 31 and the base plate 32, so that when the operation of the steering wheel 36 is transmitted to the power steering mechanism 31 via the steering shaft 35 as described above, the steering wheel support 34 and the gear case 33 are in a state of being locked so as not to rotate together with the steering shaft 35.

(related structures of Gear case and electric Motor)

As shown in fig. 7, 11, and 12, the gear case 33 has a two-piece structure including an upper gear case portion 33a and a lower gear case portion 33b, and extends rightward from the steering column 34. A gear mechanism 37 is housed inside the gear case 33 (between the upper gear case portion 33a and the lower gear case portion 33 b), an outer peripheral portion of the upper gear case portion 33a and an outer peripheral portion of the lower gear case portion 33b are bolted to each other, and the gear mechanism 37 is covered by the gear case 33.

The gear mechanism 37 is provided with a transmission shaft 38 rotatably supported in the vertical direction, a large-diameter transmission gear 39 integrally rotatably attached to the transmission shaft 38, a small-diameter transmission gear 40 integrally rotatably attached to the transmission shaft 38, and a large-diameter transmission gear 41 integrally rotatably attached to the steering shaft 35, and the transmission gears 40 and 41 are engaged with each other.

The electric motor 42 is fitted to an upper surface portion of a right end portion of the upper gear case portion 33a of the gear case 33 so as to be exposed upward from the gear case 33. A pinion gear 42a rotationally driven by the electric motor 42 meshes with the transmission gear 39 inside the gear case 33.

As shown in fig. 6 and 9, the electric motor 42 is disposed on the rear side of the engine 17, and the electric motor 42 is disposed on the fan 24 side (right side) of the handle stay 34 in the rear view.

The electric motor 42 is operated during automatic travel described later (configuration related to automatic travel).

As shown in fig. 11 and 12, when the electric motor 42 is operated, the power of the electric motor 42 is decelerated and transmitted to the steering shaft 35 from the pinion gear 42a of the electric motor 42 via the gear mechanism 37 (the transmission gears 39, 40, 41 and the transmission shaft 38).

As a result, the steering shaft 35 is rotationally operated, the front wheels 1 are steered in the same manner as described above (in the description of the structure relating to the steering column and the power steering mechanism), and the steering operation of the front wheels 1 by the electric motor 42 is assisted by the power steering mechanism 31.

In a state where the automatic travel is not performed, the electric motor 42 is in a freely rotating state. As a result, as described above (the structure relating to the steering column and the power steering mechanism), when the operator manually operates the steering wheel 36 to steer the front wheels 1, the electric motor 42 is driven via the gear mechanism 37, and the electric motor 42 does not hinder the steering operation of the front wheels 1.

As shown in fig. 3 and 6, a sub-shift lever 47 for performing a shift operation of a geared sub-transmission (refer to the above-described (transmission system from the continuously variable transmission to the front and rear wheels and the seedling planting device)) inside the transmission case 8 extends upward from the transmission case 8.

As shown in fig. 9, the upper portion of the sub-shift lever 47 is rotatably supported on a receiving portion 33c formed in the lower gear case portion 33b of the gear case 33 around a vertical axis. The operator operates the sub-transmission by gripping the sub-shift lever 47 and operating it around the vertical axis.

(Structure related to detection of steering Angle of front wheel)

When the steering operation of the front wheels 1 is performed by the electric motor 42 while performing the automatic travel described later (the configuration related to the automatic travel), it is necessary to detect the steering angle of the front wheels 1. The following describes a structure for detecting the steering angle of the front wheels 1.

As shown in fig. 9, 11, 12, and 13, a cylindrical detection member 43 made of synthetic resin is attached to the steering shaft 35 inside the intermediate portion 34b of the steering column 34, and a spiral groove 43a is formed in the outer peripheral portion of the detection member 43.

A different diameter portion 35a having an elliptical cross section is provided on the steering shaft 35 inside the detection member 43. The inside portion of the detection member 43 is formed in a different diameter shape having a diameter larger than the different diameter portion 35a of the steering shaft 35 and similar to the different diameter portion 35a of the steering shaft 35. Two semi-cylindrical spacers 44 are prepared, the inner and outer surfaces of which are formed in the same different diameter shape as the inner portion of the detection member 43.

The steering shaft 35 is inserted into the detection member 43 in a state where the two spacers 44 are fitted to the different diameter portion 35a of the steering shaft 35. Thus, the detection member 43 is rotatable integrally with the steering shaft 35 by the reduced diameter portion 35a of the steering shaft 35 and the spacer 44.

As shown in fig. 10 and 12, the potentiometer type angle sensor 45 is attached to the intermediate portion 34b of the steering wheel support 34. A vertically swingable detection arm 45a attached to a detection shaft (not shown) of the angle sensor 45 extends toward the detection member 43, and an engagement pin 45b at an end of the detection arm 45a is inserted into a spiral groove 43a of the detection member 43.

When the front wheels 1 are steered by rotating the steering shaft 35 by the electric motor 42 as described above (related structure of the gear box and the electric motor), the detection member 43 is rotated integrally with the steering shaft 35.

The spiral groove 43a of the detection member 43 is rotated with respect to the detection arm 45a of the angle sensor 45, and the detection arm 45a of the angle sensor 45 is operated to swing up and down by the spiral groove 43a of the detection member 43. Thus, the steering angle of the front wheel 1 is detected by the vertical angle of the detection arm 45a of the angle sensor 45.

(related structure of automatic traveling)

As shown in fig. 1 and 2, the right preliminary seedling stage frame 62 is connected to the right lateral side portion 9a of the support frame 9 and extends upward, the left preliminary seedling stage frame 62 is connected to the left lateral side portion 9a of the support frame 9 and extends upward, and the preliminary seedling stages 63 are supported by the right and left preliminary seedling stage frames 62.

The support frame 64 extending in the left-right direction is coupled across the upper portions of the right and left preliminary seedling table frames 62, and the GPS antenna 65 is coupled to the left-right center portion of the support frame 64.

A support frame 66 is connected upward to the rear portions of the right and left body frames 7, and an operator seat 67 is supported by the support frame 66. The control device 68 is mounted on the support frame 66 and is disposed below the driver seat 67. In the support frame 66, a portion where various harnesses (not shown) are collected is provided near the lower side of the driver seat 67, and therefore, is a position suitable for the control device 68.

The control device 68 operates the electric motor 42 based on the positional information of the machine body 3 obtained by the GPS antenna 65 to perform the steering operation of the front wheel 1 so as to perform the seedling planting work by the seedling planting device 6 while automatically running the machine body 3 along the preset work stroke.

(structure relating to wind scooper)

As shown in fig. 3 to 6, in the interior of the engine cover 30, the wind scoops 46 are disposed on the front side with respect to the steering wheel support 34 and on the upper side with respect to the engine 17.

The wind scooper 46 is formed by bending a plate material, and is formed in a mountain shape protruding upward so as to follow a rotation locus of the outer end portion of the fan 24 in a side view, and heat insulating sheets (not shown) are attached to the upper surface and the lower surface of the wind scooper 46.

As shown in fig. 3 to 7, the right-side mounting portion 46d is coupled to the vicinity of the right end portion 46a of the wind scooper 46 and extends rearward, and the left-side mounting portion 46e is coupled to the vicinity of the left end portion 46b of the wind scooper 46 and extends rearward.

The right end 46a of the wind scooper 46 is disposed close to the radiator 23 up to a position overlapping the fan 24 in a plan view. The rear portion 46c of the wind scooper 46 extends long to the rear side and the lower side, and as shown in fig. 8 and 9, the rear portion 46c of the wind scooper 46 overlaps the steering wheel stay 34 in the front view and the rear view.

As shown in fig. 4 and 5, the left end portion 46b of the wind scooper 46 is disposed at substantially the same position as the left end portion of the main body of the engine 17 in plan view and front view, and is disposed on the right side (the engine 17 side) of the output pulley 17b of the engine 17, and the left end portion 46b of the wind scooper 46 is spaced apart from the inner surface (the left opening 30a) a of the engine cover 30 in the left-right direction.

As shown in fig. 3 to 6, the wind scooper 46 is spaced apart from the inner surface of the top wall portion of the engine cover 30 by a large distance in the vertical direction, and a space is formed between the wind scooper 46 and the inner surface of the top wall portion of the engine cover 30. The region below the air guide cover 46 (on the engine 17 side) communicates with the aforementioned space via a space between the left end portion 46b of the air guide cover 46 and the inner surface of the engine cover 30 (the left opening 30 a).

As described above (in the context of the engine and the radiator), the air that has passed through the radiator 23 is guided by the air guide cover 46 so as to flow smoothly through the vicinity of the engine 17, and is guided so as to flow smoothly to the left side, which is the opposite side of the radiator 23, by the suction and blowing action of the fan 24.

(Structure for supporting wind scooper and insulating board)

As shown in fig. 7 to 10, an elongated plate member bent into a pipe shape in plan view is connected to the base plate 34a of the steering column 34 and extends forward from the steering column 34, and a right-side support portion 51 and a left-side support portion 52 are provided.

The pipe-shaped support plate 48 is coupled across the base plate 34a and the pipe portion 34c of the steering column 34 in a side view. An angular support portion 49 is provided, and the support portion 49 is connected to the support plate 48 at the left and right center portions thereof. An attachment portion 49a formed by bending an elongated plate material into an arc shape is coupled to the support portion 49 forward, and an attachment portion 49b is coupled to the support portion 49 rearward.

Rod-shaped reinforcing member 50 is coupled across right-side support portion 51 and support portion 49, and flat plate-shaped support member 53 is coupled across left-side support portion 52 and support portion 49. A flat plate-shaped reinforcing member 54 is coupled across the support plate 48 and the support member 53, and a flat plate-shaped reinforcing member 55 is coupled across the pipe portion 34c of the steering column 34 and the support member 53.

With the above configuration, right and left support portions 51, 52 and support portion 49 are supported by steering column 34.

A shift lever 56 (see fig. 1 to 5) for operating the continuously variable transmission 19 is supported by the support member 53. Right and left hinge members (not shown) that vertically openably and closably support hood 30 are coupled to right and left end portions of support portion 49.

(support of wind scooper and insulating Board)

As shown in fig. 7, 8, and 9, a flat plate-shaped heat shield plate 57 is coupled across the right support portion 51 and the support portion 49, and the heat shield plate 57 extends downward from the right support portion 51. A controller 58 for operating the electric motor 42 is connected to the mounting portion 49b of the support portion 49 and extends downward.

As shown in fig. 3 to 6 and 9, the heat shield plate 57 is disposed between the electric motor 42 and the controller 58 and the engine 17 in the front-rear direction of the machine body 3 so as to overlap the electric motor 42 and the controller 58 in the rear view, and the electric motor 42 and the controller 58 are disposed on the rear side of the heat shield plate 57.

The controller 58 is disposed between the electric motor 42 and the heat insulating plate 57 in the front-rear direction of the body 3 so as to overlap the electric motor 42 and the heat insulating plate 57 in the rear view, and the electric motor 42 is disposed on the rear side of the controller 58.

In the heat insulating plate 57, heat insulating sheets (not shown) (corresponding to heat insulating members) are attached to the front and rear surfaces of the heat insulating plate 57. In this case, the heat insulating plate 57 can also be provided with a heat insulating member by integrating the heat insulating member into the heat insulating plate 57 without attaching a heat insulating sheet to the heat insulating plate 57.

As shown in fig. 7, 8, and 9, the right attachment portion 46d of the air guide cover 46 is coupled to the heat insulating plate 57, and the left attachment portion 46e of the air guide cover 46 is coupled to the left support portion 52.

In this case, a common bolt (not shown) is threaded across the right supporting portion 51, the heat insulating plate 57, and the right mounting portion 46d of the wind scooper 46, the right supporting portion 51, the heat insulating plate 57, and the right mounting portion 46d of the wind scooper 46 are coupled to each other, and the wind scooper 46 is coupled to the right supporting portion 51 by being coupled to the heat insulating plate 57.

The wind scooper 46 is supported by the steering column 34 by being coupled to the right and left support portions 51 and 52, and the wind scooper 46 is disposed inside the engine cover 30 as described above (related structure of the wind scooper).

(related Structure of air Filter)

As shown in fig. 3 to 6, in the engine cover 30, the air cleaner 59 is attached to the attachment portion 49a of the support portion 49 in the lateral direction, and the air cleaner 59 is disposed on the upper side of the wind scooper 46 in the front view. The air cleaner 59 is disposed on the front side of the steering column 34 in side view, and is supported by the steering column 34 via the support portion 49.

The intake pipe 60 extending from the left portion of the air cleaner 59 changes its direction downward, extends downward through a space between the rear portion 46c of the air guide cover 46 and the left attachment portion 46e (see fig. 7), and is connected to the engine 17.

The intake pipe 60 passes between the rear portion 46c of the air guide cover 46 and the left mounting portion 46e, and thus the intake pipe 60 is connected across the air cleaner 59 and the engine 17 so as to pass between the right and left support portions 51, 52 in a front view and between the air guide cover 46 and the steering wheel stay 34 in a side view.

The suction duct 61 extending from the lower portion of the air cleaner 59 extends downward on the rear side with respect to the rear portion 46c of the air guide cover 46, changes its orientation rightward, extends rightward on the rear side with respect to the heat insulating plate 57, and the suction port 61a of the suction duct 61 is disposed on the rear side with respect to the radiator 23 and the fan 24.

The suction pipe 61 is disposed rearward with respect to the rear portion 46c of the air guide cover 46 and rearward with respect to the heat insulating plate 57, so that the suction pipe 61 extends downward from the air cleaner 59 so as to pass between the right and left support portions 51a, 52 in a front view and between the air guide cover 46 (heat insulating plate 57) and the steering wheel stay 34 in a side view, and the suction pipe 61 extends laterally toward the fan 24.

With the above configuration, the air outside the engine cover 30 is sucked into the suction port 61a of the suction pipe 61, and is supplied to the air cleaner 59 through the suction pipe 61. Air from an air cleaner 59 is supplied to the engine 17 through an intake pipe 60.

(first other embodiment of the invention)

The radiator 23 and the fan 24 may be disposed on the left side in the front-rear direction with respect to the engine 17.

According to this configuration, the drive pulley 17c of the engine 17 is disposed on the left portion of the engine 17, and the electric motor 42 is disposed on the left side of the steering column 34. The output pulley 17b of the engine 17 is disposed on the right portion of the engine 17, and the continuously variable transmission 19 is connected to the right portion of the transmission 8.

(second other embodiment of the invention)

The fan 24 may be disposed outside the radiator 23 (on the opposite side of the engine 17) without being disposed between the engine 17 and the radiator 23. According to this configuration, an electric motor (not shown) for rotationally driving the fan 24 is preferably provided.

Industrial applicability

The present invention can be applied not only to a riding type rice transplanter but also to a riding type direct seeder, a tractor, and other work vehicles.

Description of the reference numerals

1: a front wheel; 3: a body; 17: an engine; 23: a heat sink; 24: a fan; 31: a power steering mechanism; 33: a gear case; 33 a: an upper gearbox section; 33 b: a lower gearbox section; 34: a steering wheel support; 35: a steering shaft; 36: a steering wheel; 37: a gear mechanism; 42: an electric motor; 46: a wind scooper; 51: a support portion; 52: a support portion; 57: a heat insulation plate; 59: an air cleaner; 60: an air intake duct; 61: a suction tube.