JP7169938B2 - work vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration near an engine in a work vehicle such as a riding rice transplanter, a riding direct seeder, or a tractor.

In a riding-type rice transplanter, which is an example of a work vehicle, as disclosed in Patent Document 1, an engine is supported in the front part of the machine body, and a radiator and a fan are arranged along the front-rear direction on the right side of the engine. There is something that has been done.

In Patent Document 1, a heat shield is arranged on the rear side of the engine, and the air that has passed through the radiator by the blowing action of the fan is guided by the heat shield so as to flow to the left side, which is the opposite side of the radiator. . The heat shield plate makes it difficult for the air that has passed through the radiator to flow from the vicinity of the engine to the rear side, thereby suppressing the temperature rise of the hydrostatic continuously variable transmission arranged on the rear side of the engine.

Japanese Patent Application Laid-Open No. 2001-199251

For work vehicles such as riding-type rice transplanters, a function has been developed that enables work to be performed while automatically traveling along a predetermined work route. A steerable electric motor may be provided.
In this case, in a work vehicle in which the engine is supported in the front part of the machine body, the electric motor may be arranged behind the engine near the front wheels.

SUMMARY OF THE INVENTION It is an object of the present invention to effectively utilize a configuration in which a heat shield plate is arranged on the rear side of an engine in a work vehicle so that an electric motor capable of steering the front wheels is appropriately arranged. there is

The work vehicle of the present invention includes an engine and a radiator supported in the front part of the machine body, an electric motor arranged behind the engine and capable of steering the front wheels, and the electric motor in a rear view. a heat shield plate disposed between the electric motor and the engine in the longitudinal direction of the airframe so as to overlap with the radiator, and the radiator is disposed on the right or left side of the engine; A fan for introducing air into the radiator to flow in the vicinity of the engine opposite the radiator is positioned along the radiator and positioned above the engine to allow air to flow in the vicinity of the engine. A wind guide cover is provided to guide the air flow to the opposite side of the radiator.

According to the present invention, in a work vehicle in which an engine and a radiator are supported in the front part of the machine body, when the electric motor is arranged on the rear side with respect to the engine, the heat shield plate overlaps the electric motor when viewed from the rear. In addition, since it is located between the electric motor and the engine in the longitudinal direction of the aircraft, even if the heat of the engine flows to the rear side, the heat of the engine is stopped by the blocking plate and hits the electric motor directly. less.
As a result, the temperature rise of the electric motor can be suppressed, and the durability of the electric motor can be improved.
According to the present invention, the radiator is arranged on the right side or the left side with respect to the engine, and the fan is arranged along the radiator. It flows in the vicinity to the opposite side of the radiator.
According to the present invention, the air guide cover that guides the air flowing near the engine to the opposite side of the radiator is arranged above the engine, so that the air that has passed through the radiator is blown by the fan. , flow naturally to the opposite side of the radiator without staying near the engine.
This makes it difficult for the air that has passed through the radiator to flow rearward (to the electric motor side), reducing the state in which the heat of the engine directly hits the electric motor, thereby improving the durability of the electric motor.
The work vehicle of the present invention includes an engine and a radiator supported in the front part of the machine body, an electric motor arranged behind the engine and capable of steering the front wheels, and the electric motor in a rear view. and a heat shield plate disposed between the electric motor and the engine in the longitudinal direction of the airframe so as to overlap the fuselage, the heat shield plate being disposed on the rear side of the engine to prevent the front wheels from artificially and a power steering mechanism for assisting the steering operation of the front wheels by the steering handle; A steering shaft for transmission to a power steering mechanism is provided, and the electric motor rotates the steering shaft to steer the front wheels.
According to the present invention, in a work vehicle in which an engine and a radiator are supported in the front part of the machine body, when the electric motor is arranged on the rear side with respect to the engine, the heat shield plate overlaps the electric motor when viewed from the rear. In addition, since it is located between the electric motor and the engine in the longitudinal direction of the aircraft, even if the heat of the engine flows to the rear side, the heat of the engine is stopped by the blocking plate and hits the electric motor directly. less.
As a result, the temperature rise of the electric motor can be suppressed, and the durability of the electric motor can be improved.
According to the present invention, when a power steering mechanism that assists the steering operation of the front wheels by the steering handle is provided, the power steering mechanism is activated when the steering shaft is rotated by the electric motor and the front wheels are steered. Since the electric motor is assisted, it is possible to steer the front wheels without difficulty even with an electric motor having a relatively small output.
In the present invention, the radiator is arranged on the right side or the left side with respect to the engine, and a fan is arranged along the radiator to introduce air into the radiator and flow the vicinity of the engine to the opposite side of the radiator. Preferably, a wind guide cover is disposed above the engine and guides the air flowing near the engine to the opposite side of the radiator.
According to the present invention, the radiator is arranged on the right side or the left side with respect to the engine, and the fan is arranged along the radiator. It flows in the vicinity to the opposite side of the radiator.
According to the present invention, the air guide cover that guides the air flowing near the engine to the opposite side of the radiator is arranged above the engine, so that the air that has passed through the radiator is blown by the fan. , flow naturally to the opposite side of the radiator without staying near the engine.
This makes it difficult for the air that has passed through the radiator to flow rearward (to the electric motor side), reducing the state in which the heat of the engine directly hits the electric motor, thereby improving the durability of the electric motor.
In the present invention, a gear mechanism capable of transmitting power of the electric motor to the steering shaft and a gear case covering the gear mechanism are provided, the gear case having an upper gear case portion and a lower gear case portion, It is preferable that the outer peripheral portion of the upper gear case portion and the outer peripheral portion of the lower gear case portion are bolted to each other with the gear mechanism housed between the upper gear case portion and the lower gear case portion.
As described above, when the electric motor rotates the steering shaft, a gear mechanism capable of transmitting the power of the electric motor to the steering shaft is often provided.
According to the present invention, the gear mechanism is housed 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, so that the gear mechanism is protected from dirt, water, and the like.
In the present invention, it is preferable that the electric motor is attached to the upper surface of the upper gear case so as to protrude upward from the gear case.
According to the present invention, when mud or water on the ground splashes upward and flies near the electric motor, the mud or water tends to hit the gear case (lower gear case portion) below the electric motor, thereby It becomes difficult to hit the motor, which is advantageous in terms of protection of the electric motor.

In the present invention, it is preferable that the heat insulating plate has a heat insulating member.

According to the present invention, since the heat shield plate has the heat insulating member, it is possible to further reduce the state in which the heat of the engine directly hits the electric motor, thereby improving the durability of the electric motor.

In the present invention, the radiator is arranged on the right side or the left side with respect to the engine, and a fan is arranged along the radiator to introduce air into the radiator and flow the vicinity of the engine to the opposite side of the radiator. and a handle post that is arranged on the rear side of the engine and supports a steering handle capable of artificially steering the front wheels, and the electric motor is positioned relative to the handle post in a rear view. is preferably arranged on the fan side.

According to the present invention, the radiator is arranged on the right side or the left side with respect to the engine, and the fan is arranged along the radiator. It flows in the vicinity to the opposite side of the radiator.

According to the present invention, the handle post that supports the steering handle capable of artificially steering the front wheels is arranged on the rear side of the engine, and the electric motor is mounted on the handle post as viewed from the rear. It is placed on the side and close to the fan.
At a position close to the fan, the blowing action of the fan does not weaken so much that the air that has passed through the radiator tends to flow toward the opposite side of the radiator and less likely to flow toward the rear side (electric motor side). The position closer to the fan means that even though the air that has passed through the radiator flows to the rear (toward the electric motor), this air is not very heated by the engine.
Due to the above points, the state in which the heat of the engine directly hits the electric motor is reduced, and the durability of the electric motor can be improved.

In the present invention, it is preferable that the wind guide cover is formed along the locus of rotation of the outer end of the fan when viewed from the side.

According to the present invention, the air guide cover is formed along the locus of rotation of the outer end of the fan when viewed from the side. This makes it difficult for the air that has passed through the radiator to flow rearward (toward the electric motor), reducing the amount of heat from the engine directly hitting the electric motor, thereby improving the durability of the electric motor. can.

In the present invention, a handle post is provided on the rear side of the engine and supports a steering handle capable of manipulating the front wheels, and the wind guide cover is supported by the handle post. It is preferable to have

According to the present invention, the handle post that supports the steering handle capable of artificially steering the front wheels is arranged on the rear side of the engine, and the wind guide cover is supported on the handle post. vibration is not easily transmitted to the wind guide cover.
This suppresses the vibration of the air guide cover, which is advantageous in terms of preventing breakage of the air guide cover.

In the present invention, it is preferable that the air cleaner is arranged above the air guide cover when viewed from the front.

According to the present invention, when the air cleaner is arranged near the engine, the air cleaner is arranged above the air guide cover in a front view, so that the heat of the engine is blocked by the air guide cover. It is difficult to convey to the air cleaner.
As a result, the temperature rise of the air cleaner is suppressed, and the intake efficiency of the engine can be improved.

In the present invention, a handle post is provided on the rear side of the engine and supports a steering handle capable of artificially steering the front wheels, and the right and left support portions extend from the handle post. An intake pipe that extends forward and is supported by the handle post by connecting the wind guide cover to the support portion and that supplies air from the air cleaner to the engine is, in a front view, It is preferable that the air cleaner and the engine are connected so as to pass between the right and left support portions and between the wind guide cover and the handle post in a side view. .

According to the present invention, the handle post for supporting the steering handle capable of artificially steering the front wheels is arranged on the rear side with respect to the engine, and the right and left supports extend forward from the handle post. A wind guide cover is connected to the portion.
In the above configuration, when the air cleaner is arranged above the wind guide cover in front view, according to the present invention, the space between the wind guide cover and the handlebar post is defined between the right and left support portions. is effectively used to dispose the intake pipe connected to the air cleaner and the engine, which is advantageous in terms of compactness in the vicinity of the air cleaner.

In the present invention, an intake pipe for sucking air into the air cleaner passes between the right and left support portions when viewed from the front, and between the wind guide cover and the handle post when viewed from the side. Further, it is preferable that the air cleaner extends downward from the air cleaner and extends laterally toward the fan when viewed from the back.

According to the present invention, when an intake pipe for sucking outside air into the air cleaner is provided, the space between the air guide cover and the handlebar post is effectively used between the right and left support portions. Since the intake pipe is arranged at the bottom, it is advantageous in terms of compactness in the vicinity of the air cleaner.

In the present invention, it is preferable that the heat shield is connected to the support, and the wind guide cover is connected to the heat shield so as to be connected to the support.

According to the present invention, the support portion extending forward from the handle post is used for both the support of the heat shield plate and the air guide cover, which is advantageous in terms of structural simplification.

It is a left side view of a riding type rice transplanter. It is a top view of a riding-type rice transplanter. It is a longitudinal left side view showing the inside of the bonnet. It is an exploded perspective view showing the inside of a bonnet. It is a top view which shows the inside of a bonnet. It is a longitudinal right side view showing the inside of the bonnet. FIG. 4 is an exploded perspective view of the air guide cover and the vicinity of the handle post; It is a front view near a handle post and a heat shield. It is a rear view near a handle post and a heat shield. 4 is an exploded perspective view of the vicinity of the handle post; FIG. 3 is an exploded perspective view of a gear case and a gear mechanism; FIG. It is a longitudinal front view of a gear case and a gear mechanism. FIG. 4 is a cross-sectional plan view of a detection member and a steering shaft;

1 to 13 show a riding-type rice transplanter, which is an example of a working vehicle. In FIGS. 1 to 13, F indicates the forward direction, B indicates the rearward direction, and U indicates the upward direction. , D indicates the downward direction, R indicates the right direction, and L indicates the left direction.

(Overall configuration of ride-on rice transplanter)
As shown in FIG. 1, the ride-on rice transplanter has right and left front wheels 1 and right and left rear wheels 2, and a link mechanism 4 is supported at the rear of the machine body 3 so as to be capable of swinging up and down. A hydraulic cylinder 5 is provided extending to the side to operate the link mechanism 4 up and down.

As shown in FIGS. 1 and 3, the fuselage 3 includes right and left fuselage frames 7 arranged along the longitudinal direction, a mission case 8 connected to the front portion of the fuselage frame 7, and a front portion of the mission case 8. It has a support frame 9 or the like connected to the .

As shown in FIGS. 1, 3 and 6, the right and left front axle cases 10 are connected to the right and left portions of the transmission case 8, and the right and left front wheels 1 are steered by the front axle cases 10. It is supported so that it can be oriented. A rear axle case 11 is supported on the rear portion of the body frame 7 , and the right and left rear wheels 2 are supported on the rear axle case 11 .

(Structure of seedling planting device)
As shown in FIGS. 1 and 2, the seedling planting device 6 is provided with a planting transmission case 12, a rotary case 13, a planting arm 14, a float 15, a seedling platform 16, and the like.

Four planted transmission cases 12 are arranged side by side in the left-right direction, and a rotary case 13 is rotatably supported on the rear right and left parts of the planted transmission case 12, and at both ends of the rotary case 13 , on which the planting arm 14 is supported. A seedling platform 16 is supported so as to be movable in the left-right direction.
The rotary case 13 is rotationally driven as the seedling mount 16 is horizontally fed, and the planting arm 14 takes out the seedlings alternately from the lower part of the seedling mount 16 and plants them on the field surface.

(Transmission system from engine to continuously variable transmission)
As shown in FIGS. 3, 4 and 6, the support frame 9 includes right and left vertical wall-shaped horizontal side portions 9a and a plurality of frames 9b connected over the right and left horizontal side portions 9a. It is provided and configured in a rectangular frame shape in a plan view.

The engine 17 is supported by the frame 9b of the support frame 9 via anti-vibration rubber 18, and the engine 17 is placed horizontally so that the crankshaft (not shown) of the engine 17 extends in the left-right direction. It is

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

A tension arm 20 is supported on the left lateral side 9a of the support frame 9 so as to be able to swing vertically, and a tension wheel 21 is supported on the end of the tension arm 20 to urge the tension arm 20 upward. A spring (not shown) is provided.

A transmission belt 22 is attached across the output pulley 17b of the engine 17 and the input pulley 19b of the continuously variable transmission 19, and the tension wheel 21 is pressed upward against the lower portion of the transmission belt 22, The tension of the transmission belt 22 is maintained.

The power of the engine 17 rotates the output pulley 17b of the engine 17 counterclockwise in FIG. , and the input pulley 19b of the continuously variable transmission 19 is driven to rotate counterclockwise in FIG.

The fan 19c is driven to rotate 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 left to right, and the continuously variable transmission 19 and the transmission case sent to 8.

(Transmission system from continuously variable transmission to front and rear wheels and seedling planting device)
The continuously variable transmission 19 is configured so as to be continuously variable from a neutral position to forward and reverse.

The power of the output shaft (not shown) of the continuously variable transmission 19 is supplied by a gear shift type auxiliary transmission (not shown) inside the mission case 8, a front wheel differential mechanism (not shown), right and left front The power is transmitted to the right and left front wheels 1 via a transmission shaft (not shown) inside the axle case 10 . The power of the auxiliary transmission is transmitted to the rear axle case 11 via a transmission shaft (not shown), and is transmitted to the right and left rear wheels 2 via a transmission shaft (not shown) inside the rear axle case 11. is transmitted to

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

(Configuration related to engine and radiator)
As shown in FIGS. 3 to 6, the radiator 23 is arranged on the right side of the engine 17 along the longitudinal direction and is supported by the right side portion 9a of the support frame 9. As shown in FIGS. The engine 17 and the radiator 23 are supported on the front part of the airframe 3 by being supported by the support frame 9 .

An output shaft 17a of the engine 17 protrudes not only on the left side but also on the right side. A drive pulley 17 c is attached to the output shaft 17 a of the engine 17 , and the drive pulley 17 c of the engine 17 is arranged between the engine 17 and the radiator 23 .

A water pump 27 is provided for circulating cooling water over the engine 17 and the radiator 23 , and the water pump 27 is supported on the upper right portion of the engine 17 . A fan 24 is attached to a pulley 27 a of the water pump 27 and arranged along the radiator 23 between the engine 17 and the radiator 23 .

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

An exhaust pipe 28 extends downward from the front portion of the engine 17 and extends outward (left side) with respect to the left lateral side portion 9 a of the support frame 9 . The muffler 29 is connected to the exhaust pipe 28 and is supported by the support member 69 so as to be arranged outside (left side) of the left lateral side 9a of the support frame 9 in the longitudinal direction. there is

As shown in FIGS. 1, 2, 3, and 6, a bonnet 30 is provided to cover the engine 17, radiator 23, and the like. Openings 30a are opened in the right and left portions of the bonnet 30, and dustproof nets (not shown) are attached to the openings 30a of the bonnet 30. As shown in FIG.

The power of the engine 17 rotates the drive pulley 17c of the engine 17 clockwise in FIG. 6, drives the water pump 27 and the alternator 25, and rotates the fan 24 clockwise in FIG.

Due to the suction and blowing action of the fan 24, air is sucked from the right opening 30a of the bonnet 30 and introduced into the radiator 23. It flows to a certain left side and exits from the left opening 30a of the bonnet 30 to the outside.

(Construction related to handlebar post and power steering mechanism)
As shown in FIGS. 3 and 6, a power steering mechanism 31 is connected to the upper portion of the transmission case 8. As shown in FIGS. A board 32 is connected to the upper portion of the power steering mechanism 31 , and a gear case 33 is connected to the board 32 . A handle post 34 is connected to the gear case 33 .

As shown in FIGS. 8, 9, 10, and 12, in the handle post 34, a base plate 34a connected to the upper gear case portion 33a of the gear case 33, an intermediate portion 34b having three legs connected to the base plate 34a, an intermediate portion A round pipe-shaped pipe portion 34c and the like are provided that are connected to 34b and extend upward.

A steering shaft 35 is housed in the handle post 34 and the gear case 33 and supported so as to be rotatable in the vertical direction. A steering handle 36 is attached to the upper end of a steering shaft 35 protruding from the upper end of the pipe portion 34 c of the handle post 34 .

As shown in FIGS. 3 to 6, the handle post 34 and the power steering mechanism 31 are arranged behind the engine 17 as viewed from the side. 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, and the front wheels 1 are steered. The power steering mechanism 31 assists the steering operation of the front wheels 1 by

As shown in FIGS. 9 and 12, the handle post 34 is connected to the gear case 33, and the gear case 33 is connected to the power steering mechanism 31 and the board 32, so that the operation of the steering handle 36 can be controlled by the steering shaft. When the power is transmitted to the power steering mechanism 31 via 35, the handle post 34 and the gear case 33 are in a detented state so as not to rotate together with the steering shaft 35.

(Structure related to gear case and electric motor)
As shown in FIGS. 7, 11, and 12, the gear case 33 has an upper and lower two-part structure having an upper gear case portion 33a and a lower gear case portion 33b, and extends from the handle post 34 to the right. A gear mechanism 37 is accommodated inside the gear case 33 (between the upper gear case portion 33a and the lower gear case portion 33b), and the outer peripheral portion of the upper gear case portion 33a and the outer peripheral portion of the lower gear case portion 33b are bolted to each other. , the gear mechanism 37 is covered with the gear case 33 .

In the gear mechanism 37, a transmission shaft 38 supported rotatably along the vertical direction, a transmission gear 39 with a large diameter rotatably attached to the transmission shaft 38 integrally, and a transmission gear 39 integrally rotatably attached to the transmission shaft 38 A small diameter transmission gear 40 and a large diameter transmission gear 41 rotatably attached to the steering shaft 35 are provided, and the transmission gears 40 and 41 are meshed.

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

As shown in FIGS. 6 and 9, the electric motor 42 is arranged on the rear side with respect to the engine 17, and the electric motor 42 is arranged on the fan 24 side (right side) with respect to the handle post 34 in a rear view. are placed.

The electric motor 42 is actuated when automatic traveling described later in (Construction Regarding Automatic Traveling) is performed.
As shown in FIGS. 11 and 12, when the electric motor 42 operates, the power of the electric motor 42 is transmitted from the pinion gear 42a of the electric motor 42 through the gear mechanism 37 (the transmission gears 39, 40, 41 and the transmission shaft 38). is decelerated and transmitted to the steering shaft 35 .

As a result, the steering shaft 35 is rotatably operated, and the front wheels 1 are steered in the same manner as described above (Construction relating to the handle post and power steering mechanism). Maneuvering is assisted by a power steering mechanism 31 .

The electric motor 42 is in a free-rotating state when automatic travel is not performed. As a result, as described in the above (Construction relating to handle post and power steering mechanism), when the operator manually operates the steering handle 36 to steer the front wheel 1, the gear mechanism 37 is used. As a result, the electric motor 42 does not resist the steering operation of the front wheels 1 .

As shown in FIGS. 3 and 6, the gear transmission type sub-transmission device inside the transmission case 8 (see the above-mentioned (transmission system from the continuously variable transmission to the front and rear wheels and the seedling planting device)) An auxiliary gearshift lever 47 for gearshifting extends upward from the transmission case 8 .

As shown in FIG. 9, the upper portion of the sub-transmission lever 47 is supported by a receiving portion 33c formed in the lower gear case portion 33b of the gear case 33 so as to be rotatable about the vertical axis. The subtransmission is operated by an operator holding the subtransmission lever 47 and operating it around the vertical axis.

(Configuration related to detection of steering angle of front wheels)
When the steering operation of the front wheels 1 is performed by the electric motor 42 with the automatic traveling described later in (Construction Regarding Automatic Traveling) being performed, the steering angle of the front wheels 1 needs to be detected. A configuration for detecting the steering angle of the front wheels 1 will be described below.

As shown in FIGS. 9, 11, 12, and 13, a synthetic resin cylindrical detection member 43 is attached to the steering shaft 35 inside the intermediate portion 34b of the handle post 34, and the outer circumference of the detection member 43 is is formed with a spiral groove 43a.

Inside the detecting member 43, the steering shaft 35 is provided with a different diameter portion 35a having an oval cross section. The inner portion of the detection member 43 has a larger diameter than the different diameter portion 35 a of the steering shaft 35 and is formed in a different diameter shape similar to the different diameter portion 35 a of the steering shaft 35 . Two semi-cylindrical spacers 44 having inner and outer surfaces with different diameters identical to those of the inner portion of the detection member 43 are prepared.

The steering shaft 35 is inserted into the detecting member 43 with the two spacers 44 attached to the different diameter portion 35 a of the steering shaft 35 . As a result, the different diameter portion 35 a of the steering shaft 35 and the spacer 44 allow the detection member 43 to rotate integrally with the steering shaft 35 .

A potentiometer type angle sensor 45 is mounted on the intermediate portion 34b of the handle post 34, as shown in FIGS. A detection arm 45a attached to a detection shaft (not shown) of the angle sensor 45 and capable of swinging up and down extends toward the detection member 43, and an engagement pin 45b at the end of the detection arm 45a , is inserted into the spiral groove 43 a of the detection member 43 .

As described in the above (Gear Case and Electric Motor Configuration), when the electric motor 42 rotates the steering shaft 35 to steer the front wheel 1, the detection member 43 rotates integrally with the steering shaft 35. be done.

The spiral groove 43a of the detection member 43 rotates with respect to the detection arm 45a of the angle sensor 45, and the detection arm 45a of the angle sensor 45 is swung up and down by the spiral groove 43a of the detection member 43. . As a result, the steering angle of the front wheel 1 is detected from the vertical angle of the detection arm 45 a of the angle sensor 45 .

(Configuration related to automatic driving)
As shown in FIGS. 1 and 2, the right preliminary seedling loading frame 62 is connected to the right lateral side portion 9a of the support frame 9 and extends upward, and the left preliminary seedling loading frame 62 is It is connected to the left lateral side portion 9a of the support frame 9 and extends upward, and a spare seedling placing table 63 is supported by the right and left spare seedling placing table frames 62. As shown in FIG.

A support frame 64 extending in the left-right direction is connected over the upper portions of the right and left preliminary seedling mount frames 62 , and a GPS antenna 65 is connected to the left-right central 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 a driver's seat 67 is supported by the support frame 66 . A control device 68 is attached to the support frame 66 and located below the driver's seat 67 . The area near the lower side of the driver's seat 67 on the support frame 66 is a convenient location for the control device 68 because various harnesses (not shown) are gathered there.

The control device 68 controls the position of the machine body 3 by the GPS antenna 65 so that the seedling planting work is performed by the seedling planting device 6 while the machine body 3 automatically travels along the work process set in advance. Based on the information, the electric motor 42 is operated to steer the front wheels 1 .

(Structure related to air guide cover)
As shown in FIGS. 3 to 6 , inside the hood 30 , the wind guide cover 46 is arranged on the front side of the handle post 34 and on the upper side of the engine 17 .

The wind guide cover 46 is formed by bending a plate material, and is formed in a mountain shape that protrudes upward along the rotation locus of the outer end of the fan 24 when viewed from the side. A heat insulating sheet (not shown) is attached to the upper and lower surfaces of the .

As shown in FIGS. 3 to 7, the right mounting portion 46d is connected to the vicinity of the right end portion 46a of the wind guide cover 46 and extends rearward, and the left mounting portion 46e is connected to the wind guide cover. 46 and extends rearward.

A right end portion 46a of the wind guide cover 46 is arranged to approach the radiator 23 to a position overlapping the fan 24 in a plan view. A rear portion 46c of the wind guide cover 46 extends rearward and downward relatively long, and as shown in FIGS. Post 34 overlaps.

As shown in FIGS. 4 and 5, the left end portion 46b of the wind guide cover 46 is arranged 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 positioned further than the output pulley 17b of the engine 17. It is arranged on the right side (engine 17 side), and the space between the left end 46b of the air guide cover 46 and the inner surface (left opening 30a) a of the bonnet 30 is relatively wide in the left-right direction.

As shown in FIGS. 3 to 6, the gap between the air guide cover 46 and the inner surface of the ceiling of the bonnet 30 is relatively large in the vertical direction, and the gap between the air guide cover 46 and the inner surface of the ceiling of the bonnet 30 is large. A space is formed between them. The region on the lower side (engine 17 side) of the wind guide cover 46 and the above-described space are formed between the left end 46b of the wind guide cover 46 and the inner surface of the bonnet 30 (left opening 30a). , are in communication.

As described above in (Construction Regarding Engine and Radiator), air that has passed through radiator 23 is guided by air guide cover 46 so as to flow smoothly near engine 17 due to the intake and blowing action of fan 24 . , is guided to flow smoothly to the left opposite side of the radiator 23 .

(Structure for supporting the air guide cover and the heat shield plate)
As shown in FIGS. 7 to 10, an elongated plate member bent into a channel shape in plan view is connected to the base plate 34a of the handle post 34, extends forward from the handle post 34, and extends to the right support portion 51 and the right support portion 51. A left support 52 is provided.

A channel-shaped support plate 48 in a side view is connected across the substrate 34a of the handle post 34 and the pipe portion 34c. An angle-shaped support portion 49 is provided, and the left and right central portions of the support portion 49 are connected to the support plate 48 . A mounting portion 49a formed by bending an elongated plate into an arc shape is connected to the support portion 49 forwardly, and a mounting portion 49b is connected to the support portion 49 rearwardly.

A rod-like reinforcing member 50 is connected across the right support portion 51 and the support portion 49, and a flat plate-like support member 53 is connected across the left support portion 52 and the support portion 49. . A flat reinforcement member 54 is connected across the support plate 48 and the support member 53 , and a flat reinforcement member 55 is connected across the pipe portion 34 c of the handle post 34 and the support member 53 .
With the structure described above, the right and left support portions 51 and 52 and the support portion 49 are supported by the handlebar post 34 .

A shift lever 56 (see FIGS. 1 to 5) that operates the continuously variable transmission 19 is supported by the support member 53 . Right and left hinge members (not shown) that support the bonnet 30 so that it can be opened and closed vertically are connected to the right and left ends of the support portion 49 .

(Support for wind guide cover and heat shield)
As shown in FIGS. 7, 8, and 9, a flat heat shield plate 57 is connected 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. extended to the side. 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 FIGS. 3 to 6 and 9, the heat shield plate 57 overlaps the electric motor 42 and the controller 58 when viewed from the rear so that the electric motor 42 and the controller 58 and the engine extend in the longitudinal direction of the airframe 3. 17 , and the electric motor 42 and the controller 58 are arranged behind the heat shield plate 57 .

The controller 58 is arranged between the electric motor 42 and the heat shield plate 57 in the longitudinal direction of the airframe 3 so as to overlap the electric motor 42 and the heat shield plate 57 when viewed from the rear. , are arranged on the rear side with respect to the controller 58 .

In the heat shield plate 57 , heat insulating sheets (not shown) (corresponding to heat insulating members) are attached to the front and rear surfaces of the heat shield plate 57 . In this case, instead of attaching the heat insulating sheet to the heat shield plate 57, the heat shield plate 57 can be made to have the heat insulating member by melting the heat insulating member into the inside of the heat shield plate 57. .

As shown in FIGS. 7, 8, and 9, the right mounting portion 46d of the wind guide cover 46 is connected to the heat shield plate 57, and the left mounting portion 46e of the wind guide cover 46 is connected to the left support portion 52. connected to
In this case, a common bolt (not shown) is passed through the right support portion 51, the heat shield plate 57, and the right mounting portion 46d of the air guide cover 46, so that the right support portion 51, the heat shield plate 57 and the right mounting portion 46 d of the air guide cover 46 are connected to each other, and the air guide cover 46 is connected to the heat shield plate 57 to be connected to the right support portion 51 .

The wind guide cover 46 is supported by the handle post 34 by being connected to the right and left support portions 51 and 52. are arranged inside the bonnet 30 .

(Configuration related to air cleaner)
As shown in FIGS. 3 to 6, inside the bonnet 30, the air cleaner 59 is laterally attached to the attachment portion 49a of the support portion 49 along the left-right direction. , are arranged above the air guide cover 46 . The air cleaner 59 is arranged on the front side of the handlebar post 34 in a side view, and is supported by the handlebar post 34 via the support portion 49 .

An intake pipe 60 coming out from the left side of the air cleaner 59 turns downward and extends downward through between the rear portion 46c of the air guide cover 46 and the left mounting portion 46e (see FIG. 7). and connected to the engine 17 .

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

A suction pipe 61 protruding from the lower part of the air cleaner 59 extends downward from the rear portion 46 c of the air guide cover 46 , turns to the right, and extends rearward from the heat shield plate 57 . is extended to the right, and an intake port 61 a of the intake pipe 61 is arranged on the rear side with respect to the radiator 23 and the fan 24 .

By arranging the suction pipe 61 on the rear side of the rear portion 46c of the air guide cover 46 and on the rear side of the heat shield plate 57, the suction pipe 61 is arranged on the right and left sides in a front view. It extends downward from the air cleaner 59 so as to pass between the support portions 51a and 52 and between the air guide cover 46 (heat shield plate 57) and the handle post 34 in a side view. A pipe 61 extends laterally toward the fan 24 side.

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

(First alternative embodiment of the invention)
The radiator 23 and the fan 24 may be arranged on the left side of the engine 17 along the front-rear direction.

According to this configuration, the drive pulley 17c of the engine 17 is arranged on the left side of the engine 17, and the electric motor 42 is arranged on the left side with respect to the handle post . An output pulley 17 b of the engine 17 is arranged on the right side of the engine 17 and the continuously variable transmission 19 is connected to the right side of the transmission case 8 .

(Second alternative embodiment of the invention)
Fan 24 may be positioned external to radiator 23 (opposite side of engine 17 ) instead of between engine 17 and radiator 23 . According to this configuration, an electric motor (not shown) that drives the fan 24 to rotate may be provided.

The present invention can be applied not only to riding-type rice transplanters, but also to work vehicles such as riding-type direct seeders and tractors.

1 front wheel 3 fuselage 17 engine 23 radiator 24 fan 31 power steering mechanism 33 gear case 33a upper gear case portion 33b lower gear case portion 34 handle post 35 steering shaft 36 control handle 37 gear mechanism 42 electric motor 46 wind guide cover 51 support portion 52 support portion 57 Heat shield plate 59 Air cleaner 60 Intake pipe 61 Intake pipe

Claims (13)

an engine and radiator supported at the front of the fuselage;
an electric motor arranged on the rear side of the engine and capable of steering front wheels;
a heat shield plate disposed between the electric motor and the engine in the longitudinal direction of the airframe so as to overlap with the electric motor when viewed from the rear ;
The radiator is arranged on the right or left side with respect to the engine,
a fan positioned along the radiator for directing air into the radiator to flow in the vicinity of the engine to the opposite side of the radiator;
A working vehicle provided with a wind guide cover disposed above the engine and guiding air flowing near the engine to the opposite side of the radiator . an engine and radiator supported at the front of the fuselage;
an electric motor arranged on the rear side of the engine and capable of steering front wheels;
a heat shield plate disposed between the electric motor and the engine in the longitudinal direction of the airframe so as to overlap with the electric motor when viewed from the rear;
A handle post is arranged on the rear side with respect to the engine and supports a steering handle capable of artificially steering the front wheels,
a power steering mechanism that assists the steering operation of the front wheels by the steering handle;
a steering shaft that is installed in the handle post and transmits the operation of the steering handle to the power steering mechanism,
A working vehicle in which the electric motor rotates the steering shaft to steer the front wheels. The radiator is arranged on the right or left side with respect to the engine,
a fan positioned along the radiator for directing air into the radiator to flow in the vicinity of the engine to the opposite side of the radiator;
3. The work vehicle according to claim 2 , further comprising a wind guide cover disposed above the engine and guiding air flowing near the engine to the opposite side of the radiator. a gear mechanism capable of transmitting the power of the electric motor to the steering shaft; and a gear case covering the gear mechanism,
The gear case is
It has an upper gear case portion and a lower gear case portion, and in a state in which the gear mechanism is accommodated between the upper gear case portion and the lower gear case portion, the outer circumference of the upper gear case portion and the outer circumference of the lower gear case portion 4. A work vehicle according to claim 2 or 3 , wherein the parts are bolted to each other. 5. The work vehicle according to claim 4 , wherein the electric motor is attached to the upper surface of the upper gear case so as to protrude upward from the gear case. The work vehicle according to any one of claims 1 to 5 , wherein the heat shield plate has a heat insulating member. The radiator is arranged on the right or left side with respect to the engine,
a fan positioned along the radiator for directing air into the radiator to flow in the vicinity of the engine to the opposite side of the radiator;
A handle post is arranged on the rear side with respect to the engine and supports a steering handle capable of artificially steering the front wheels,
The work vehicle according to any one of claims 1 to 6, wherein the electric motor is arranged on the fan side with respect to the handle post in a rear view. The work vehicle according to claim 1 or 3 , wherein the wind guide cover is formed along a locus of rotation of the outer end of the fan when viewed from the side. A handle post is arranged on the rear side with respect to the engine and supports a steering handle capable of artificially steering the front wheels,
The working vehicle according to any one of claims 1, 3, and 8, wherein the wind guide cover is supported by the handle post. The work vehicle according to any one of claims 1, 3, 8, and 9, wherein the air cleaner is arranged above the air guide cover in a front view. A handle post is arranged on the rear side with respect to the engine and supports a steering handle capable of artificially steering the front wheels,
Right and left support portions extend forward from the handle post,
The wind guide cover is supported by the handle post by being connected to the support,
An intake pipe that supplies air from the air cleaner to the engine passes between the right and left support portions when viewed from the front, and between the wind guide cover and the handle post when viewed from the side. 11. The work vehicle according to claim 10 , wherein the air cleaner and the engine are connected to each other. The air intake pipe for sucking air into the air cleaner passes between the right and left support portions when viewed from the front, and between the wind guide cover and the handle post when viewed from the side. 12. The work vehicle according to claim 11 , wherein the cleaner extends downward from the cleaner and laterally extends toward the fan when viewed from the rear. The heat shield is connected to the support,
The work vehicle according to claim 11 or 12 , wherein the wind guide cover is connected to the support portion by being connected to the heat shield plate.

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