Working vehicle

Abstract

To provide a working vehicle capable of driving a hydraulic pump by a working electric motor without separately providing an electric motor for driving the hydraulic pump.SOLUTION: A first electric motor (30) for driving a working device (4) and a second electric motor (40) for driving a front wheel (2) are provided on the lower side of a grass collection container (7). A gear case (50) for accelerating and decelerating the output rotation of the first electric motor (30) and the second electric motor (40) is provided on the front side of the first electric motor (30) and the second electric motor (40). A second output shaft (33) is provided on the upstream side in a transmission path of a first output shaft (31) of the gear case (50) to which the working device (4) is connected, and a hydraulic pump (51) is connected to the second output shaft (33).SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a work vehicle for cutting lawn grass. [Background technology]

[0002] Conventionally, there is known a work vehicle equipped with a work motor that drives a work device for cutting grass mounted on the front side of the vehicle frame, and a propulsion motor that drives the front wheels, etc. (Patent Document 1) [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-27497 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the solution of Patent Document 1 has the problem that it is necessary to separately provide electric motors for driving hydraulic cylinders that raise and lower the working device and hydraulic pumps that pump oil for the auxiliary working device.

[0005] SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a work vehicle in which a hydraulic pump can be driven by a work electric motor without the need for a separate electric motor for driving the hydraulic pump. [Means for solving the problem]

[0006] The present invention, which has solved the above problems, is as follows. That is, the invention described in claim 1 is a work vehicle having a pair of left and right front wheels (2) and rear wheels (3) provided below a body frame (1), a working device (4) for cutting grass provided in front of the body frame (1), a control unit (5) on which an operator rides provided behind the working device (4), and a grass collection container (7) for storing grass provided behind the control unit (5), This work vehicle is characterized in that a first electric motor (30) that drives the work device (4) and a second electric motor (40) that drives the front wheels (2) are provided below the grass collection container (7), a gear case (50) that increases or decreases the output rotation of the first electric motor (30) and the second electric motor (40) is provided in front of the first electric motor (30) and the second electric motor (40), a second output shaft (33) is provided upstream of the transmission path from the first output shaft (31) of the gear case (50) to which the work device (4) is connected, and a hydraulic pump (51) is connected to the second output shaft (33).

[0007] The invention described in claim 2 is the work vehicle described in claim 1, in which a clutch (55) for connecting and disconnecting the power transmission path is provided between the first output shaft (31) and the second output shaft (33).

[0008] The invention described in claim 3 is a work vehicle described in claim 1 or 2, in which the first output shaft (31) extends forward from the gear case (50) and the second output shaft (33) extends rearward from the gear case (50).

[0009] A fourth aspect of the present invention is the work vehicle according to the third aspect, wherein the hydraulic pump (51) is disposed below the first electric motor (30) and the second electric motor (40) in rear view.

[0010] The invention of claim 5 is the work vehicle of claim 4, wherein a valve (52) for braking the clutch (55) is provided on an upper part of the gear case (50), the hydraulic pump (51) and the valve (52) are connected by a pipe (53A), and the pipe (53A) is arranged between the first electric motor (30) and the second electric motor (40).

[0011] In the invention of claim 6, a circulation port (50B) is formed in an upper part of the gear case (50), and the valve (52) and the circulation port (50B) are connected by a pipe (53B), The work vehicle according to claim 5, wherein oil sent from the clutch (55) to the valve (52) is sent to the gear case (50) through a pipe (53B). [Effects of the Invention]

[0012] According to the invention of claim 1, a first electric motor (30) for driving the working device (4) and a second electric motor (40) for driving the front wheels (2) are provided below the grass collection container (7), a gear case (50) for increasing or decreasing the output rotation of the first electric motor (30) and the second electric motor (40) is provided in front of the first electric motor (30) and the second electric motor (40), a second output shaft (33) is provided in the transmission path upstream of the first output shaft (31) of the gear case (50) to which the working device (4) is connected, and a hydraulic pump (51) is connected to the second output shaft (33), so that the hydraulic pump (51) can be driven by the first electric motor (30). Furthermore, even when the second electric motor (40) is stopped and the work vehicle is stopped, the hydraulic pump (51) can be driven to drive the work equipment connected to the hydraulic pump (51).

[0013] According to the invention of claim 2, in addition to the effect of the invention of claim 1, a clutch (55) that connects and disconnects the power transmission path is provided between the first output shaft (31) and the second output shaft (33). Therefore, even when the driving of the working device (4) is stopped, the hydraulic pump (51) can be driven to drive the auxiliary working device connected to the hydraulic pump (51).

[0014] According to the invention of claim 3, in addition to the effects of the invention of claim 1 or 2, the first output shaft (31) extends forward from the gear case (50) and the second output shaft (33) extends rearward from the gear case (50). This makes it possible to easily attach the hydraulic pump (51) to the rear of the second output shaft (33).

[0015] According to the invention of claim 4, in addition to the effect of the invention of claim 3, the hydraulic pump (51) is disposed below the first electric motor (30) and the second electric motor (40) in rear view, so that the hydraulic pump (51) is filled with oil, thereby preventing air entrainment.

[0016] According to the invention of claim 5, in addition to the effect of the invention of claim 4, a valve (52) for braking the clutch (55) is provided on the upper part of the gear case (50), the hydraulic pump (51) and the valve (52) are connected by a pipe (53A), and the pipe (53A) is arranged between the first electric motor (30) and the second electric motor (40). Therefore, the space formed between the first electric motor (30) and the second electric motor (40) can be used efficiently.

[0017] According to the invention of claim 6, in addition to the effect of the invention of claim 5, a circulation port (50B) is formed in the upper part of the gear case (50), the valve (52) and the circulation port (50B) are connected by a pipe (53B), and the oil sent from the clutch (55) to the valve (52) is sent to the gear case (50) via the pipe (53B). Therefore, the oil in the gear case (50) can be maintained at a predetermined amount. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a perspective view of the work vehicle as seen from the front left side. [Figure 2] FIG. 2 is a perspective view of the front part of the motor chamber as viewed from the rear left side. [Figure 3] FIG. 2 is a perspective view of the rear of the motor compartment as viewed from the rear left side. [Figure 4] FIG. 2 is a perspective view of the electric motor and gear case as viewed from the front left side. [Figure 5] FIG. 2 is a perspective view of the electric motor and gear case as viewed from the rear left side. [Figure 6] FIG. 2 is a rear view of the electric motor and gear case. [Figure 7] FIG. 3 is a cross-sectional view of the left part of the gear case. [Figure 8] FIG. 4 is an explanatory diagram of an oil seal into which an input shaft of a gear case is fitted. [Figure 9] FIG. 2 is a transmission diagram of the output rotation of the electric motor. [Figure 10] FIG. 2 is a perspective view of the battery as seen from the rear left side. [Figure 11] FIG. 2 is a plan view showing the battery mounted in the motor compartment. [Figure 12] FIG. 2 is a plan view of the electric motor and the inverter device. [Figure 13] FIG. 2 is a left side view of the electric motor and the inverter device. [Figure 14] FIG. [Figure 15] FIG. 2 is a perspective view of the motor chamber as viewed from the rear right side. [Figure 16] FIG. 10 is an explanatory diagram showing the rear portion of the dust cover opened from the radiator. [Figure 17] FIG. 10 is an explanatory diagram showing the rear of the radiator and dust cover opened. [Figure 18] FIG. 4 is an explanatory diagram of an opening formed in a left wall of the motor chamber. DETAILED DESCRIPTION OF THE INVENTION

[0019] As shown in FIG. 1, the work vehicle has a pair of left and right front wheels 2 provided at the front lower portion of a machine frame 1, and a pair of left and right rear wheels 3 provided at the rear lower portion of the machine frame 1.

[0020] A working device 4 for cutting grass growing in the field is mounted at the front of the machine frame 1, and a control section 5 on which the operator rides is mounted behind the working device 4. A safety frame (ROPS) 6 for protecting the operator is mounted behind the control section 5, and a grass collection container 7 for storing cut grass is mounted behind the safety frame 6, and an electric motor room 8 is mounted below the grass collection container 7, in which a working motor 30 for driving the working device 4, a battery 60, etc. are mounted.

[0021] A steering column 10 that supports a steering wheel is provided in front of the driver's seat in the control section 5. A monitor that displays the output rotation speed of the electric motor 30 and the like is provided at the top of the steering column 10, and the bottom is fixed to the front part of the floor.

[0022] A brake pedal 11 for slowing down the rotation speed of the front wheels 2 is provided on the left side of the steering column 10 on the floor, and an accelerator pedal 12 for increasing or decreasing the output rotation speed of the electric motor 40 for driving the front wheels 2 is provided on the right side.

[0023] The area above the front wheel 2 is covered with a fender 13, and the fender 13 located to the right of the driver's seat is provided with a gearshift lever 14 for operating an inverter device 45 that increases or decreases the output rotation of the electric motor 40.

[0024] The rear of the working device 4 and the front of the grass collection container 7 are connected by a chute 16 extending in the front-to-rear direction, and a blower 17 for exhausting air into the chute 16 is provided in the middle of the front-to-rear direction of the chute 16.

[0025] A pair of left and right link arms 18 are provided at the front of the left and right walls of the grass collection container 7. The front parts of the link arms 18 are fixed to the left and right parts of the safety frame 6 so that they can swing freely, and the safety frame 6 and the link arms 18 are connected by lifting parts 19 such as hydraulic cylinders, and the rear part of the bottom wall of the grass collection container 7 rests on a horizontal frame 21A of a support frame 21, which will be described later. This allows the lifting parts 19 to be driven to raise and lower the grass collection container 7.

[0026] As shown in Figures 2 and 3, a motor (the "first motor" in the claims) 30 and a motor (the "second motor" in the claims) 40 are provided in the front motor chamber 8A of the motor chamber 8, and a battery 60 that stores electricity to be supplied to the motor 30, etc. is provided in the rear motor chamber 8B.

[0027] In a plan view, the electric motor 30 is provided on the left side of the center line in the left-right direction of the body frame 1, and the electric motor 40 is provided on the right side of the center line in the left-right direction of the body frame 1. The difference in weight between the weight applied to the left side of the center line in the left-right direction of the body frame 1 and the weight applied to the right side of the center line in the left-right direction of the body frame 1 can be suppressed, thereby improving the steering performance.

[0028] When viewed from the side, a support frame 20 extending upward from the body frame 1 is provided in the partition between the front electric chamber 8A and the rear electric chamber 8B, and a support frame 21 extending upward from the body frame 1 is provided at the rear end of the rear electric chamber 8B.

[0029] The support frame 20 is formed of a left vertical frame 20L extending upward from the middle of the left side of the body frame 1, a right vertical frame 20R extending upward from the middle of the right side of the body frame 1, and a horizontal frame 20A extending in the left-right direction connecting the upper parts of the left vertical frame 20L and the right vertical frame 20R.

[0030] The support frame 21 is formed of a left vertical frame 21L extending upward from the rear end of the left side of the body frame 1, a right vertical frame 21R extending upward from the rear end of the right side of the body frame 1, a horizontal frame 21A extending in the left-right direction connecting the upper parts of the left vertical frame 21L and the right vertical frame 21R, and a horizontal frame 21B extending in the left-right direction connecting the middle parts of the left vertical frame 21L and the right vertical frame 21R. The left part of the horizontal frame 21B extends leftward beyond the left vertical frame 21L, and the right part extends rightward beyond the right vertical frame 21R.

[0031] The middle part of the left vertical frame 20L and the left end part of the horizontal frame 21B are connected by a left front-rear frame 22L extending in the front-rear direction, and the middle part of the right vertical frame 20R and the right end part of the horizontal frame 21B are connected by a right front-rear frame 22R also extending in the front-rear direction. This allows the rear part of the battery 60 to be located above the drive shaft 46 of the rear wheel 3, preventing the vehicle frame 1 from being significantly deformed.

[0032] The upper part of the left vertical frame 20L and the middle part of the left vertical frame 23L provided at the rear of the control unit 5 are connected by a left front-rear frame 24L extending in the fore-and-aft direction, and the upper part of the right vertical frame 20R of the support frame 20 and the middle part of the right vertical frame 23R provided at the rear of the control unit 5 are connected by a right front-rear frame 24R extending in the fore-and-aft direction.

[0033] As shown in FIGS. 4 and 5, the electric motors 30 and 40 are The electric motor 30 is connected to a gear case 50 provided on the side of the vehicle. The output rotation of the electric motor 30 is increased or decreased in the gear case 50, and then transmitted to an output shaft 31 (referred to as the "first output shaft" in the claims) to which the working device 4 and the like are connected, an output shaft 32 (referred to as the "blower 17" in the claims) to which the blower 17 and the like are connected, and an output shaft (referred to as the "second output shaft" in the claims) 33 (referred to as the "second output shaft" in the claims) to which the hydraulic pump 51 and the like are connected. The output rotation of the electric motor 40 is increased or decreased in the gear case 50, and then transmitted to an output shaft 41 (referred to as the "front wheels 2" in the claims) to which the front wheels 2 and the like are connected, and an output shaft 42 (referred to as the "auxiliary working equipment" in the claims) to which the auxiliary working equipment and the like are connected. In this technical field, the output shaft is often referred to as the PTO.

[0034] The output shaft 31 extends forward from the left central portion of the gear case 50 in the front-to-rear direction, and the front portion of the output shaft 31 is connected to the working device 4. The output shaft 32 extends forward from the front portion of the gear case 50, and the front portion of the output shaft 32 is connected to the blower 17. The output shaft 33 extends rearward from the rear portion of the gear case 50, and the rear portion of the output shaft 33 is connected to a hydraulic pump 51. In addition, a valve 52 is provided on the top of the gear case 50.

[0035] The output shaft 41 and the output shaft 42 extend in the front-rear direction on the right side of the gear case 50. The output rotation of the output shaft 41 is transmitted to the drive shaft 43 via a differential gear 554 provided inside the gear case 50. An insertion hole 50A extending in the left-right direction, through which the drive shaft 43 is inserted, is provided in the middle of the gear case 50 in the front-rear direction. The output shaft 42 extends rearward from the rear of the gear case 50.

[0036] The length of the electric motor 30 in the front-rear direction is longer than the length of the electric motor 40 in the front-rear direction. This allows the working device 4, which is constantly driven and subjected to a large load, to be driven smoothly.

[0037] As shown in Fig. 6, the hydraulic pump 51 is provided below the electric motors 30 and 40. This prevents air from entering the hydraulic pump 51, thereby suppressing air entrapment. Furthermore, flexible piping 53A connecting the hydraulic pump 51 and the valve 52 is routed between the electric motors 30 and 40. This allows the space formed between the electric motors 30 and 40 to be used effectively.

[0038] 7, oil sent to valve 52 is sent via valve 52 to clutch 55 provided upstream of the power transmission path of output shaft 31 in gear case 50, and to clutch 56 provided upstream of the power transmission path of output shaft 32. This allows clutch 55 and clutch 56 to be engaged and disengaged by driving valve 52.

[0039] Oil sent from clutch 55 or clutch 56 to valve 52 is returned to gear case 50 from a circulation port 50B formed in the upper part of gear case 50 via flexible piping 53B. This makes it possible to maintain a predetermined amount of oil in gear case 50.

[0040] 8, an oil seal 50C is provided on the outer periphery of the input shaft 57A of the gear case 50 connected to the electric motor 30. This prevents the oil filled in the gear case 50 from flowing along the outer periphery of the input shaft 57A and being discharged to the outside.

[0041] As shown in FIG. 9, the output rotation of the electric motor 30 is transmitted to the input shaft 57A of the gear case 50, and the output rotation of the input shaft 57A is accelerated or decelerated before being transmitted to the rotating shaft 58A.

[0042] The output rotation of the rotary shaft 58A is accelerated or decelerated and then transmitted to the output shaft 33, and the output rotation of the output shaft 33 is transmitted to the hydraulic pump 51. This allows the electric motor 30 to be driven, thereby driving the hydraulic pump 51.

[0043] The output rotation of the rotating shaft 58A is accelerated or decelerated before being transmitted to the rotating shaft 58B, and the output rotation of the rotating shaft 58B is transmitted to the output shaft 31 via the clutch 55. The output rotation of the output shaft 31 is transmitted to the working device 4. This drives the electric motor 30, thereby driving the working device 4.

[0044] The output rotation of the rotary shaft 58A is accelerated or decelerated before being transmitted to the rotary shaft 58C, and the output rotation of the rotary shaft 58C is transmitted to the output shaft 32 via the clutch 56. The output rotation of the output shaft 32 is transmitted to the blower 17. This drives the electric motor 30, thereby driving the blower 17.

[0045] The output rotation of the electric motor 40 is transmitted to the input shaft 57B of the gear case 50, and the output rotation of the input shaft 57B is transmitted to the output shaft 41 and the output shaft 42 after being accelerated or decelerated.

[0046] The output rotation of the output shaft 41 is transmitted to a drive shaft 43 for the front wheels via a differential gear 54, and the output rotation of the drive shaft 43 is transmitted to the front wheels 2. This drives the electric motor 40 to rotate the front wheels 2. The output rotation of the output shaft 42 can also be transmitted to the rear wheels 3 via a clutch, an auxiliary implement, a differential gear, etc.

[0047] 10, the battery 60 is formed from four battery modules 60A. The upper parts of the four battery modules 60A are connected by a pair of left and right angle-shaped mounting frames 61 that are spaced a predetermined distance apart in the left-right direction and extend in the front-rear direction, and the lower parts are connected by a pair of left and right square pipe-shaped mounting frames 62 that are spaced a predetermined distance apart in the left-right direction and extend in the front-rear direction.

[0048] The front part of the mounting frame 61 extends forward of the battery 60, and the rear part extends rearward of the battery 60. The mounting frame 62 is formed to extend from the front end to the rear end of the battery 60.

[0049] As shown in Figures 3 and 11, the front part of the mounting frame 61 is removably fixed to the horizontal frame 20A of the support frame 20 by fastening members such as bolts, and the rear part is removably fixed to the horizontal frame 21A of the support frame 21 by fastening members such as bolts.

[0050] The left mounting frame 62 is placed on the left front-rear frame 22L, and the right mounting frame 62 is placed on the right front-rear frame 22R.

[0051] Openings 61A are formed in the front and rear of the mounting frame 61, through which hanging hooks can be inserted when replacing the battery 60. This allows the battery 60 to be easily attached to and detached from the support frames 20 and 21, making it easy to replace the battery 60.

[0052] A radiator 65 that cools water that cools the electric motor 30 and other components is provided on the outside of the left wall of the electric motor chamber 8, and a fan 66 that blows outside air toward the electric motor chamber 8 is provided between the radiator 65 and the electric motor 30. A circular opening (not shown) is also formed in the left wall of the electric motor chamber 8 at a location facing the fan 66. This makes it possible to suppress a rise in temperature of the electric motor 30 and other components, thereby preventing malfunctions of the electric motor 30 and other components.

[0053] An auxiliary battery 67 that stores power to be supplied to the monitor of the control unit 5 is provided on the outside of the part of the right wall of the motor compartment 8 that faces the radiator 65. This makes it possible to reduce the weight difference between the left and right parts of the work vehicle.

[0054] 12 and 13, an inverter device 35 for driving the electric motor 30 is provided at a predetermined distance in the front-to-rear direction behind the electric motor 30, and an inverter device 45 for driving the electric motor 40 is provided at a predetermined distance in the front-to-rear direction behind the electric motor 40. The inverter devices 35, 45 are also provided at a predetermined distance in the front-to-rear direction in front of the battery 60. This facilitates the routing of the electric motors 30, 40 and the inverter devices 35, 45. Furthermore, air blown by the fan 66 passes through the gaps between the electric motors 30, 40 and the inverter devices 35, 45, thereby enabling the electric motors 30, 40 and the inverter devices 35, 45 to be efficiently cooled.

[0055] As shown in FIGS. 14 and 15, a power receiving port 70 for receiving power from a household power source is provided on the upper rear side of the radiator 65.

[0056] An electrical equipment unit 71 is provided below the battery 60. The electrical equipment unit 71 includes a charger that converts the power supplied to the power receiving port 70 from AC to DC and supplies the power to the battery 60, and a converter that steps down the DC voltage supplied via a power distribution unit 73 or the like to the rated voltage of the auxiliary battery 67. The electrical equipment unit 71 is detachably fixed to the undersides of the left front and rear frames 22L and right front and rear frames 22R. Alternatively, the power receiving port 70 can be provided on the surface of the left part of the fender 13 located to the left of the cockpit, and the electrical equipment unit 71 can be provided inside the fender 13 located to the left of the cockpit.

[0057] A monitoring unit 72 incorporating a monitoring device for monitoring the temperature and voltage of the battery 60 is provided in front of the battery 60. The monitoring unit 72 is detachably fixed to the upper sides of the left front and rear frames 24L and right front and rear frames 24R.

[0058] In a side view, it is preferable that the upper wall of the monitoring unit 72 is positioned lower than the mounting frame 61. This prevents the monitoring unit 72 from protruding above the mounting frame 61 and allows the vertical height of the motor chamber 8 to be made low, so that the center of gravity of the grass collection container 7 placed above the motor chamber 8 can be set at a low position, allowing the work vehicle to travel stably.

[0059] A power distribution unit 73 having a built-in terminal block that distributes the power supplied from the monitoring unit 72 to the inverter devices 35, 45 and the converter of the electrical unit 71 is provided below the monitoring unit 72. The power distribution unit 73 is detachably fixed to the undersides of the left front-rear frame 24L and the right front-rear frame 24R.

[0060] 16, a dust cover 68 is provided on the left side of the radiator 65 to prevent dust from adhering to the radiator 65, and the front part of the dust cover 68 is rotatably fixed to a pin extending in the vertical direction. This makes it possible to easily remove dust adhering to the dust cover 68 by moving the rear part of the dust cover 68 outward.

[0061] As shown in Figure 17, a dust cover 68 is attached to the left side of the radiator 65 to prevent dust from adhering to the radiator 65. The front part of the radiator 65 is rotatably fixed to a pin that extends in the vertical direction. This makes it possible to move the rear part of the radiator 65 outward and easily remove dust adhering to the radiator 65.

[0062] As shown in Figure 18, a rectangular opening 69 is provided in the upper front part of the right wall of the front motor chamber 8A. This allows outside air to be blown into the front motor chamber 8A through the opening 69, making it easy to remove dust adhering to the motor 30, etc. When the opening 69 is not in use, it is covered with a rectangular lid to prevent dust from entering the front motor chamber 8A through the opening 69. [Explanation of symbols]

[0063] 1 Aircraft frame 2 front wheels 3 rear wheels 4 Work equipment 5 Control Unit 7 Grass collection container 30 Electric motor (1st electric motor) 31 Output shaft (first output shaft) 33 Output shaft (No. output shaft) 40 Electric motor (second electric motor) 50 gear case 50B Circulation port 51 Hydraulic pump 52 Valve 53A Piping 53B Piping 55 Clutch

Claims

1. A work vehicle having a pair of left and right front wheels (2) and rear wheels (3) provided below a body frame (1), a working device (4) for cutting grass provided in front of the body frame (1), a control section (5) for an operator to ride on provided behind the working device (4), and a grass collection container (7) for storing grass provided behind the control section (5), A first electric motor (30) for driving the working device (4) and a second electric motor (40) for driving the front wheel (2) are provided below the grass collecting container (7), a gear case (50) for increasing or decreasing the output rotation of the first electric motor (30) and the second electric motor (40) is provided in front of the first electric motor (30) and the second electric motor (40); a second output shaft (33) is provided upstream of a first output shaft (31) of a gear case (50) to which the working device (4) is connected, in a power transmission path; A work vehicle characterized in that a hydraulic pump (51) is connected to the second output shaft (33).

2. 2. A work vehicle according to claim 1, further comprising a clutch (55) for connecting and disconnecting the power transmission paths between the first output shaft (31) and the second output shaft (33).

3. 3. A work vehicle according to claim 1, wherein the first output shaft (31) extends forward from a gear case (50), and the second output shaft (33) extends rearward from the gear case (50).

4. 4. The work vehicle according to claim 3, wherein the hydraulic pump (51) is disposed below the first electric motor (30) and the second electric motor (40) in rear view.

5. 5. The work vehicle according to claim 4, wherein a valve (52) for braking the clutch (55) is provided on an upper portion of the gear case (50), the hydraulic pump (51) and the valve (52) are connected by a pipe (53A), and the pipe (53A) is laid between the first electric motor (30) and the second electric motor (40).

6. A circulation port (50B) is formed in the upper part of the gear case (50), and the valve (52) and the circulation port (50B) are connected by a pipe (53B), 6. A work vehicle according to claim 5, wherein oil sent from the clutch to the valve is sent to the gear case via a pipe.

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