1. A work vehicle comprising: a work device capable of being raised and lowered, and configured to perform ground work; a hydraulic cylinder configured to drive the work device to be raised and lowered; a control valve unit including a control valve configured to control a flow of a hydraulic fluid to the hydraulic cylinder, a shutoff valve configured to shut off a flow of the hydraulic fluid between the hydraulic cylinder and the control valve, and a valve case housing the control valve and the shutoff valve; an operation member for switching the shutoff valve; and a link member configured to transmit operating force from the operation member to the shutoff valve, wherein the link member is on one side relative to the valve case in a lateral direction of a body of the work vehicle.

2. The work vehicle according to claim 1, further comprising: a travel body capable of being steered; a steering wheel for steering the travel body; a transmission case housing a transmission; a power steering device configured to be driven by the hydraulic fluid from the transmission case, and assist steering performed by the steering wheel; a first tubular member extending between the control valve unit and the power steering device, and through which the hydraulic fluid from the power steering device flows toward the control valve unit; and a second tubular member extending between the control valve unit and the transmission case, and through which the hydraulic fluid from the control valve unit flows toward the transmission case, wherein the control valve unit further includes a recovery section configured to recover the hydraulic fluid from the valve case, and to which the second tubular member is connected, and the recovery section is disposed on another side relative to the valve case in the lateral direction of the body.

3. The work vehicle according to claim 2, wherein the transmission case and the power steering device are in a front portion of the travel body, and the control valve unit is rearward of the transmission case and the power steering device in the travel body.

4. The work vehicle according to claim 2 or 3, wherein the recovery section is attachable to and detachable from the valve case.

5. The work vehicle according to any one of claims 2 to 4, wherein the control valve unit is on one side relative to a center of the travel body in the lateral direction of the body, the link member is outward of the valve case in the lateral direction of the body, and the recovery section is inward of the valve case in the lateral direction of the body.

6. The work vehicle according to any one of claims 1 to 5, wherein the control valve unit further includes a solenoid configured to drive the control valve to be switched, the work vehicle further comprises an additional link member extending between the operation member and the link member, and configured to transmit operating force from the operation member to the link member, and the additional link member extends between a position corresponding to a left end portion of the solenoid and a position corresponding to a right end portion of the solenoid in the lateral direction of the body.

7. The work vehicle according to any one of claims 2 to 5, wherein the first tubular member is upstream of the control valve unit in a direction in which the hydraulic fluid flows, and the second tubular member is downstream of the control valve unit in the direction in which the hydraulic fluid flows.

8. The work vehicle according to any one of claims 1 to 7, further comprising: a driver's seat, wherein the operation member is constituted by a lever, and the operation member is overlapped with the driver's seat in a plan view, below the driver's seat.

9. The work vehicle according to claim 8, wherein the operation member is inclined upward and outward in the lateral direction of the body.

10. The work vehicle according to any one of claims 1 to 9, further comprising: a driver's seat; a control device; a relay box housing a relay; and a fuse box housing a fuse, wherein the control valve unit is on one side relative to a center of the driver's seat in the lateral direction of the body, the control device is below the driver's seat, and the relay box and the fuse box are forward of the control valve unit.

Description:BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] The present invention relates to a work vehicle.

2. Description of the Related Art
[0002] Conventionally, the work vehicle described in Patent Document 1 has been known as a work vehicle, for example. The work vehicle described in Patent Document 1 includes: a work device capable of being raised and lowered, and configured to perform ground work; a hydraulic cylinder configured to drive the work device to be raised and lowered; a control valve unit including a control valve configured to control the supply of a hydraulic fluid to the hydraulic cylinder, a shutoff valve configured to shut off a flow of the hydraulic fluid between the hydraulic cylinder and the control valve, and a valve case that houses the control valve and the shutoff valve; an operation member for switching the shutoff valve; and a link member configured to transmit operating force from the operation member to the shutoff valve. The link member is disposed above the valve case.
[0003] JP 2015-223088A is an example of related art.

SUMMARY OF THE INVENTION
[0004] In the work vehicle described in Patent Document 1, the valve case is covered by another member (e.g., a step) from above, and therefore there is room for improvement in facilitating maintenance of the link member.
[0005] In view of the above-described circumstances, there is demand for a work vehicle that enables easy maintenance of a link member.
[0006] A feature of the present invention lies in
a work vehicle including:
a work device capable of being raised and lowered, and configured to perform ground work;
a hydraulic cylinder configured to drive the work device to be raised and lowered;
a control valve unit including
a control valve configured to control a flow of a hydraulic fluid to the hydraulic cylinder,
a shutoff valve configured to shut off a flow of the hydraulic fluid between the hydraulic cylinder and the control valve, and
a valve case housing the control valve and the shutoff valve;
an operation member for switching the shutoff valve; and
a link member configured to transmit operating force from the operation member to the shutoff valve,
wherein the link member is on one side relative to the valve case in a lateral direction of a body of the work vehicle.
[0007] Here, a relatively surplus space exists on one side relative to the valve case in the lateral direction of the body. With this characteristic feature, the link member can be disposed using the space on one side relative to the valve case in the lateral direction of the body. Also, maintenance of the link member can be easily performed by accessing the link member from one side in the lateral direction of the body.
[0008] Furthermore, in the present invention, it is preferable that
the work vehicle further includes:
a travel body capable of being steered;
a steering wheel for steering the travel body;
a transmission case housing a transmission;
a power steering device configured to be driven by the hydraulic fluid from the transmission case, and assist steering performed by the steering wheel;
a first tubular member extending between the control valve unit and the power steering device, and through which the hydraulic fluid from the power steering device flows toward the control valve unit; and
a second tubular member extending between the control valve unit and the transmission case, and through which the hydraulic fluid from the control valve unit flows toward the transmission case,
wherein the control valve unit further includes a recovery section configured to recover the hydraulic fluid from the valve case, and to which the second tubular member is connected, and
the recovery section is disposed on another side relative to the valve case in the lateral direction of the body.
[0009] With this characteristic feature, the hydraulic fluid from the valve case (e.g., a hydraulic fluid that has leaked out of the valve case) can be recovered by the recovery section, and the recovered hydraulic fluid can be returned to the transmission case via the second tubular member.
[0010] Here, a relatively surplus space exists on the other side relative to the valve case in the lateral direction of the work vehicle. With this characteristic feature, the recovery section can be disposed using the space on the other side relative to the valve case in the lateral direction of the body.
[0011] Furthermore, in the present invention, it is preferable that
the transmission case and the power steering device are in a front portion of the travel body, and
the control valve unit is rearward of the transmission case and the power steering device in the travel body.
[0012] This characteristic feature allows the transmission case, the power steering device, and the control valve unit to be disposed in a compact manner in the front-rear direction of the body.
[0013] Furthermore, in the present invention, it is preferable that
the recovery section is attachable to and detachable from the valve case.
[0014] This characteristic feature allows the recovery section to be easily replaced through attachment and detachment.
[0015] Furthermore, in the present invention, it is preferable that
the control valve unit is on one side relative to a center of the travel body in the lateral direction of the body,
the link member is outward of the valve case in the lateral direction of the body, and
the recovery section is inward of the valve case in the lateral direction of the body.
[0016] This characteristic feature makes it possible to easily access the link member from outward of the body in the lateral direction of the body when performing maintenance of the link member.
[0017] Furthermore, in the present invention, it is preferable that
the control valve unit further includes a solenoid configured to drive the control valve to be switched,
the work vehicle further includes an additional link member extending between the operation member and the link member, and configured to transmit operating force from the operation member to the link member, and
the additional link member extends between a position corresponding to a left end portion of the solenoid and a position corresponding to a right end portion of the solenoid in the lateral direction of the body.
[0018] With this characteristic feature, the additional link member can be formed in such a manner as to avoid the solenoid.
[0019] Furthermore, in the present invention, it is preferable that
the first tubular member is upstream of the control valve unit in a direction in which the hydraulic fluid flows, and
the second tubular member is downstream of the control valve unit in the direction in which the hydraulic fluid flows.
[0020] This characteristic feature increases the length of the fluid path of the hydraulic fluid flowing from the transmission case and returning to the transmission case via the control valve unit. Accordingly, it is possible to increase the cooling performance of the hydraulic fluid.
[0021] Furthermore, in the present invention, it is preferable that
the work vehicle further includes:
a driver's seat,
wherein the operation member is constituted by a lever, and
the operation member is overlapped with the driver's seat in a plan view, below the driver's seat.
[0022] This characteristic feature can prevent an erroneous operation of the operation member due to an incidental contact with the operation member.
[0023] Furthermore, in the present invention, it is preferable that
the operation member is inclined upward and outward in the lateral direction of the body.
[0024] This characteristic feature allows the driver to easily operate the operation member while seating in the driver's seat.
[0025] Furthermore, in the present invention, it is preferable that
the work vehicle further includes:
a driver's seat;
a control device;
a relay box housing a relay; and
a fuse box housing a fuse,
wherein the control valve unit is on one side relative to a center of the driver's seat in the lateral direction of the body,
the control device is below the driver's seat, and
the relay box and the fuse box are forward of the control valve unit.
[0026] With this characteristic feature, the control device can be disposed using the space below the driver's seat. In addition, the relay box and the fuse box can be disposed using the space located forward of the control valve unit.

BRIEF DESCRIPTION OF THE DRAWINGS
[0027] FIG. 1 is a right side view showing a ride-on rice planter.
FIG. 2 is a plan view showing the ride-on rice planter.
FIG. 3 is a diagram showing a hydraulic circuit.
FIG. 4 is a left side view showing a control valve unit, a hydraulic lock lever, a link mechanism, and a piping structure.
FIG. 5 is an exploded perspective view showing the control valve unit.
FIG. 6 is a left side view showing a state in which the hydraulic lock lever is operated to an open position.
FIG. 7 is a plan view showing a state in which the hydraulic lock lever is operated to the open position.
FIG. 8 is a left side view showing a state in which the hydraulic lock lever is operated to a closed position.
FIG. 9 is a plan view showing a state in which the hydraulic lock lever is operated to the closed position.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0028] An embodiment for carrying out the present invention will be described with reference to the drawings. In the following description, the direction indicated by the arrow F is referred to as the "forward direction of a body", the direction indicated by the arrow B as the "rearward direction of the body", the direction indicated by the arrow L as the "leftward direction of the body", and the direction indicated by the arrow R as the "rightward direction of the body", the direction indicated by the arrow U as the "upward direction of the body", and the direction indicated by the arrow D as the "downward direction of the body".
[0029] FIGS. 1 and 2 show a ride-on rice planter. As shown in FIGS. 1 and 2, the ride-on rice planter includes a travel body 1, a motive section 2, an operation section 3, a step 4, a planting device 5 (corresponding to a "work device" according to the present invention), a fertilizing device 6, and a transmission section 7.
[0030] The travel body 1 includes left and right front wheels 9, left and right rear wheels 10, and a body frame 11. The body frame 11 is supported on the left and right front wheels 9 and the left and right rear wheels 10. The front wheels 9 are configured to be steerable and capable of being rotationally driven. That is, the travel body 1 is configured to be steerable. The rear wheels 10 are configured to be unsteerable and capable of being rotationally driven.
[0031] The motive section 2 is provided at a front portion of the travel body 1. The motive section 2 includes an engine (not shown), and a hood 12 that houses the engine.
[0032] A driver rides on the operation section 3. The operation section 3 is provided rearward of the motive section 2. The operation section 3 includes a driver's seat 13, and a steering wheel 14 for steering the travel body 1. The steering performed by the steering wheel 14 is assisted by the power steering device 18.
[0033] The step 4 is provided on the body frame 11. The step 4 includes a front step 15, a middle step 16, and a rear step 17.
[0034] The front step 15 is provided around the hood 12 at a front portion of the body frame 11. The rear step 17 is provided around the driver's seat 13 at a rear portion on the body frame 11. The middle step 16 is provided at a location between the front step 15 and the rear step 17 on the body frame 11.
[0035] The planting device 5 plants seedlings in the surface of a rice field. That is, the planting device 5 performs ground work. In the present embodiment, the planting device 5 is constituted by an eight-row planting device. The planting device 5 is provided rearward of the travel body 1. The planting device 5 is configured to be raised and lowered by a link mechanism 19. The planting device 5 is supported on a rear portion of the body frame 11 via the link mechanism 19.
[0036] The link mechanism 19 includes a hydraulic cylinder C that drives the planting device 5 to be raised and lowered. The planting device 5 is raised as a result of the hydraulic cylinder C being extended. The planting device 5 is lowered as a result of the hydraulic cylinder C being contracted.
[0037] The fertilizing device 6 supplies a fertilizer to the surface of a rice field. In the present embodiment, the fertilizing device 6 is constituted by an eight-row fertilizing device. The fertilizing device 6 is provided rearward of the driver's seat 13 at a rear portion of the travel body 1.
[0038] The transmission section 7 changes the speed of power from the engine. The power from the transmission section 7 is transmitted to the left and right front wheels 9, the left and right rear wheels 10, the planting device 5, and the fertilizing device 6. The transmission section 7 includes a hydrostatic continuously variable transmission (not shown), and a transmission case 20. The transmission case 20 houses a geared transmission (not shown). The transmission section 7 changes the speed of the power from the engine using the continuously variable transmission, and changes the speed of the power from the continuously variable transmission using the transmission.
[0039] As shown in FIG. 3, the ride-on rice planter includes a hydraulic circuit. The hydraulic circuit includes a transmission case 20, a hydraulic pump P, a power steering device 18, a control valve unit 21, a hydraulic cylinder C, a first fluid path 22, a second fluid path 23, a third fluid path 24, a fourth fluid path 25, a fifth fluid path 26, and a sixth fluid path 27.
[0040] The hydraulic pump P pumps the hydraulic fluid contained in the transmission case 20. The power steering device 18 is driven by the hydraulic fluid from the hydraulic pump P. That is, the power steering device 18 is driven by the hydraulic fluid from the transmission case 20.
[0041] The control valve unit 21 includes a control valve 28, a shutoff valve 29, a recovery section 30, and a valve case 31. The valve case 31 houses the control valve 28 and the shutoff valve 29.
[0042] The first fluid path 22 extends between the hydraulic pump P and the power steering device 18. The second fluid path 23 extends between the power steering device 18 and the control valve 28. The third fluid path 24 extends between the control valve 28 and the shutoff valve 29. The fourth fluid path 25 extends between the shutoff valve 29 and the hydraulic cylinder C. The fifth fluid path 26 extends between the control valve 28 and the recovery section 30. The sixth fluid path 27 extends between the recovery section 30 and the transmission case 20.
[0043] The hydraulic fluid from the hydraulic pump P flows through the first fluid path 22, the second fluid path 23, the third fluid path 24, and the fourth fluid path 25 toward the hydraulic cylinder C. The hydraulic fluid from the hydraulic cylinder C flows through the fourth fluid path 25, the third fluid path 24, the fifth fluid path 26, and the sixth fluid path 27 toward the transmission case 20.
[0044] The control valve 28 controls a flow of the hydraulic fluid to the hydraulic cylinder C. In the present embodiment, the control valve 28 is constituted by an electromagnetic valve. The control valve 28 is configured to be switched between three positions. Specifically, the control valve 28 is configured to be switched between an extended position at which the hydraulic cylinder C is extended, a contracted position at which the hydraulic cylinder C is contracted, and a neutral position at which the hydraulic cylinder C is stopped.
[0045] The shutoff valve 29 shuts off a flow of the hydraulic fluid between the third fluid path 24 and the fourth fluid path 25. That is, the shutoff valve 29 shuts off a flow of the hydraulic fluid between the hydraulic cylinder C and the control valve 28. The shutoff valve 29 is configured to be switched between two positions. Specifically, the shutoff valve 29 is configured to be switched between an open position at which the third fluid path 24 and the fourth fluid path 25 are brought into communication with each other, and a closed position at which communication between the third fluid path 24 and the fourth fluid path 25 is shut off. The shutoff valve 29 is switched between the open position and the closed position using a hydraulic lock lever 32 (corresponding to an "operation member" according to the present invention).
[0046] The hydraulic lock lever 32 serves to switch the shutoff valve 29. The hydraulic lock lever 32 is configured to pivot about a pivot axis X1 extending in the lateral direction of the body. The hydraulic lock lever 32 is configured to be switched between an open position P1 at which the shutoff valve 29 is at the open position, and a closed position P2 at which the shutoff valve 29 is at the closed position. A link mechanism 33 that transmits operating force from the hydraulic lock lever 32 to the shutoff valve 29 extends between the hydraulic lock lever 32 and the shutoff valve 29. As a result of the hydraulic lock lever 32 being switched to the closed position P2 while the hydraulic cylinder C is extended, the shutoff valve 29 is switched to the closed position, and the planting device 5 is kept raised.
[0047] As shown in FIGS. 4 and 5, the control valve unit 21 includes a solenoid 34 that drives the control valve 28 (see FIG. 3) to be switched. The solenoid 34 is attached to a front surface portion of the valve case 31. The valve case 31, the recovery section 30, and the solenoid 34 are unitized. The control valve unit 21 is supported on the body frame 11.
[0048] The recovery section 30 has an opening 30a formed therein. The hydraulic fluid from the fifth fluid path 26 (see FIG. 3) flows into the opening 30a. That is, the recovery section 30 recovers the hydraulic fluid from the valve case 31. The recovery section 30 is attached to a left side surface portion of the valve case 31. The recovery section 30 is constituted by a member different from the valve case 31. The recovery section 30 is attachable to and detachable from the valve case 31. The recovery section 30 is disposed on the other side (in the present embodiment, the left side) relative to the valve case 31 in the lateral direction of the body. That is, the recovery section 30 is inward of the valve case 31 in the lateral direction of the body.
[0049] In FIG. 4, the direction in which the hydraulic fluid flows is indicated by the arrow A. As shown in FIGS. 3 and 4, a first pipe 35 (corresponding to a "first tubular member" according to the present invention) extends between the control valve unit 21 and the power steering device 18. The first pipe 35 extends between the valve case 31 and the power steering device 18. Through the first pipe 35, the hydraulic fluid from the power steering device 18 flows toward the valve case 31. That is, through the first pipe 35, the hydraulic fluid from the power steering device 18 flows toward the control valve unit 21.
[0050] The first pipe 35 constitutes the second fluid path 23. An upstream end portion of the first pipe 35 in a direction A in which the hydraulic fluid flows is connected to the power steering device 18. A downstream end portion of the first pipe 35 in the direction A in which the hydraulic fluid flows is connected to the valve case 31. The first pipe 35 is disposed upstream relative to the control valve unit 21 in the direction A in which the hydraulic fluid flows.
[0051] A second pipe 36 (corresponding to a "second tubular member" according to the present invention) extends between the control valve unit 21 and the transmission case 20. The second pipe 36 extends between the recovery section 30 and the transmission case 20. Through the second pipe 36, the hydraulic fluid from the recovery section 30 flows toward the transmission case 20. That is, through the second pipe 36, the hydraulic fluid from the control valve unit 21 flows toward the transmission case 20.
[0052] The second pipe 36 constitutes the sixth fluid path 27. An upstream end portion of the second pipe 36 in the direction A in which the hydraulic fluid flows is connected to the recovery section 30. A downstream end portion of the second pipe 36 in the direction A in which the hydraulic fluid flows is connected to the transmission case 20. The second pipe 36 is downstream of the control valve unit 21 in the direction A in which the hydraulic fluid flows.
[0053] As shown in FIG. 1, the transmission case 20 and the power steering device 18 are disposed at the front portion of the travel body 1. The control valve unit 21 is rearward of the transmission case 20 and the power steering device 18 in the travel body 1. In the present embodiment, the control valve unit 21 is disposed at the rear portion of the travel body 1.
[0054] In FIG. 2, the center of the travel body 1 in the lateral direction of the body is denoted by C1, and the center of the driver's seat 13 in the lateral direction of the body is denoted by C2. Note that the center C1 of the travel body 1 in the lateral direction of the body coincides with the center C2 of the driver's seat 13 in the lateral direction of the body.
[0055] As shown in FIG. 2, the control valve unit 21 is on one side (in the present embodiment, the right side) relative to the center C2 of the driver's seat 13 in the lateral direction of the body. That is, the control valve unit 21 is on one side (in the present embodiment, the right side) relative to the center C1 of the travel body 1 in the lateral direction of the body. The hydraulic lock lever 32 is overlapped with with the driver's seat 13 in a plan view, below the driver's seat 13. In the present embodiment, the hydraulic lock lever 32 completely is overlapped with the driver's seat 13 in a plan view. The hydraulic lock lever 32 is inclined upward and outward (in the present embodiment, rightward) in the lateral direction of the body.
[0056] A control device 45 is below the driver's seat 13. The control device 45 controls the control valve unit 21 and so forth. A relay box 37 that houses a relay (not shown) and a fuse box 38 that houses a fuse (not shown) are forward of the control valve unit 21. The control valve unit 21, the control device 45, the relay box 37, and the fuse box 38 are covered by a cover 46 from above. By removing the driver's seat 13 and the cover 47, the control valve unit 21, the control device 45, the relay box 37, and the fuse box 38 can be exposed upwardly, and maintenance of these components can be performed from above.
[0057] As shown in FIGS. 6 and 7, the hydraulic lock lever 32 is supported on a support frame 40 via a support shaft 39. The support shaft 39 is constituted by a headed pin. A retaining snap pin 41 is attached to the support shaft 39. The support frame 40 is provided with a bent portion 40a for allowing the snap pin 41 to escape.
[0058] The link mechanism 33 includes a first link member 42 (corresponding to an "additional link member" according to the present invention), and a second link member 43 (corresponding to a "link member" according to the present invention). The first link member 42 transmits operating force from the hydraulic lock lever 32 to the second link member 43. The first link member 42 extends between the hydraulic lock lever 32 and the second link member 43. The first link member 42 extends between a position corresponding to a left end portion of the solenoid 34 and a position corresponding to a right end portion of the solenoid 34 in the lateral direction of the body.
[0059] The second link member 43 transmits power of the first link member 42 to the shutoff valve 29. That is, the second link member 43 transmits the operating force from the hydraulic lock lever 32 to the shutoff valve 29. The second link member 43 is configured to pivot about a pivot axis X2 extending in the lateral direction of the body. The second link member 43 is supported on the valve case 31.
[0060] The second link member 43 is on one side (in the present embodiment, the right side) relative to the valve case 31 in the lateral direction of the body. That is, the second link member 43 is outward of the valve case 31 in the lateral direction of the body.
[0061] In response to the hydraulic lock lever 32 being switched to the open position P1, the operating force from the hydraulic lock lever 32 is transmitted to the second link member 43 via the first link member 42. This causes the second link member 43 to be pivoted forward about the pivot axis X2, whereby the shutoff valve 29 is switched to the open position.
[0062] As shown in FIGS. 8 and 9, in response to the hydraulic lock lever 32 being switched to the closed position P2, the operating force from the hydraulic lock lever 32 is transmitted to the second link member 43 via the first link member 42. This causes the second link member 43 to be pivoted reward about the pivot axis X2, whereby the shutoff valve 29 is switched to the closed position.
[0063] A check plug 44 for viewing the interior of the valve case 31 is provided at an upper portion of the valve case 31. The first link member 42 is provided with a bent portion 42a for allowing the check plug 44 to escape in a state in which the hydraulic lock lever 32 is switched to the closed position P2.
[0064] Alternative embodiments according to the present invention will be described below.
[0065] (1) In the above embodiment, the second link member 43 is disposed on the right side relative to the valve case 31. That is, the second link member 43 is outward of the valve case 31 in the lateral direction of the body. However, the second link member 43 may be disposed on the left side relative to the valve case 31. That is, the second link member 43 may be inward of the valve case 31 in the lateral direction of the body.
[0066] (2) In the above embodiment, the recovery section 30 is disposed on the left side relative to the valve case 31. That is, the recovery section 30 is inward of the valve case 31 in the lateral direction of the body. However, the recovery section 30 may be disposed on the right side relative to the valve case 31. That is, the recovery section 30 may be outward of the valve case 31 in the lateral direction of the body.
[0067] (3) In the above embodiment, the control valve unit 21 is disposed at a rear portion of the travel body 1. However, the control valve unit 21 may be disposed at a central portion of the travel body 1 in the front-rear direction. Also, the control valve unit 21 may be in a front portion of the travel body 1.
[0068] (4) In the above embodiment, the recovery section 30 is attachable to and detachable from the valve case 31. However, the recovery section 30 may be configured to be not attachable to and undetachable from the valve case 31. That is, the recovery section 30 may be formed in a single piece with the valve case 31.
[0069] (5) In the above embodiment, the control valve unit 21 includes the recovery section 30. However, the control valve unit 21 need not include the recovery section 30. In this case, the second pipe 36 can be connected to the valve case 31.
[0070] (6) In the above embodiment, the hydraulic lock lever 32 is completely overlapped with the driver's seat 13 in a plan view. However, the hydraulic lock lever 32 may be partially overlapped with the driver's seat 13 in a plan view. Also, the hydraulic lock lever 32 may not be completely overlapped with the driver's seat 13 in a plan view.
[0071] (7) In the above embodiment, the shutoff valve 29 may be switched between the open position and the closed position by an actuator (e.g., an electric motor). For example, the electric motor may be driven by an instruction from the control device 45 according to an operation performed using an operation member (e.g., a lever or a button), and the power from the electric motor may be transmitted to the shutoff valve 29 via the link mechanism, whereby the shutoff valve 29 may be switched between the open position and the closed position.
[0072] (8) In the above embodiment, the first link member 42 extends between a position corresponding to a left end portion of the solenoid 34 and a position corresponding to a right end portion of the solenoid 34 in the lateral direction of the body. However, the first link member 42 need not extend between a position corresponding to a left end portion of the solenoid 34 and a position corresponding to a right end portion of the solenoid 34 in the lateral direction of the body. For example, the first link member 42 may be linear or substantially linear in the front-rear direction of the body.
[0073] (9) In the above embodiment, the hydraulic lock lever 32 is inclined upward and outward (rightward) in the lateral direction of the body. However, the hydraulic lock lever 32 may be inclined upward and inward (leftward) in the lateral direction of the body. Also, the hydraulic lock lever 32 need not be inclined upward and toward one side in the lateral direction of the body. For example, the hydraulic lock lever 32 may be linear or substantially linear in the vertical direction as viewed in the front-rear direction of the body.
[0074] (10) In the above embodiment, the control valve unit 21 is on one side (the right side) relative to the center C2 of the driver's seat 13 in the lateral direction of the body. That is, the control valve unit 21 is on one side (the right side) relative to the center C1 of the travel body 1 in the lateral direction of the body. However, the control valve unit 21 may be disposed on the other side (the left side) relative to the center C2 of the driver's seat 13 in the lateral direction of the body. That is, the control valve unit 21 may be disposed on the other side (the left side) relative to the center C1 of the travel body 1 in the lateral direction of the body.
[0075] (11) In the above embodiment, the control device 45 is below the driver's seat 13. However, the control device 45 may be disposed at a location different from a location below the driver's seat 13.
[0076] (12) In the above embodiment, the relay box 37 and the fuse box 38 are forward of the control valve unit 21. However, the relay box 37 and the fuse box 38 may be disposed at locations different from locations forward of the control valve unit 21.
[0077] (13) In the above embodiment, the planting device 5 is constituted by an eight-row planting device. However, the planting device 5 is not limited to an eight-row planting device. For example, the planting device 5 may be constituted by any of four- to six-row planting devices, and a ten-row planting device.
[0078] (14) In the above embodiment, the fertilizing device 6 is constituted by an eight-row fertilizing device. However, the fertilizing device 6 is not limited to an eight-row fertilizing device. For example, the fertilizing device 6 may be constituted by any of four- to six-row fertilizing devices, and a ten-row fertilizing device.
[0079] The present invention is also applicable to combines and tractors in addition to ride-on rice planters.

Description of Reference Signs
[0080] 1: Travel body
5: Planting device (work device)
13: Driver's seat
14: Steering wheel
18: Power steering device
20: Transmission case
21: Control valve unit
28: Control valve
29: Shutoff valve
30: Recovery section
31: Valve case
32: Hydraulic lock lever (operation member)
34: Solenoid
35: First pipe (first tubular member)
36: Second pipe (second tubular member)
37: Relay box
38: Fuse box
42: First link member (additional link member)
43: Second link member (link member)
45: Control device
A: Direction in which hydraulic fluid flows
C: Hydraulic cylinder
C1: Center of travel body in lateral direction of body
C2: Center of driver's seat in lateral direction of body
, Claims:What Is Claimed Is:

1. A work vehicle comprising:
a work device capable of being raised and lowered, and configured to perform ground work;
a hydraulic cylinder configured to drive the work device to be raised and lowered;
a control valve unit including
a control valve configured to control a flow of a hydraulic fluid to the hydraulic cylinder,
a shutoff valve configured to shut off a flow of the hydraulic fluid between the hydraulic cylinder and the control valve, and
a valve case housing the control valve and the shutoff valve;
an operation member for switching the shutoff valve; and
a link member configured to transmit operating force from the operation member to the shutoff valve,
wherein the link member is on one side relative to the valve case in a lateral direction of a body of the work vehicle.

2. The work vehicle according to claim 1, further comprising:
a travel body capable of being steered;
a steering wheel for steering the travel body;
a transmission case housing a transmission;
a power steering device configured to be driven by the hydraulic fluid from the transmission case, and assist steering performed by the steering wheel;
a first tubular member extending between the control valve unit and the power steering device, and through which the hydraulic fluid from the power steering device flows toward the control valve unit; and
a second tubular member extending between the control valve unit and the transmission case, and through which the hydraulic fluid from the control valve unit flows toward the transmission case,
wherein the control valve unit further includes a recovery section configured to recover the hydraulic fluid from the valve case, and to which the second tubular member is connected, and
the recovery section is disposed on another side relative to the valve case in the lateral direction of the body.

3. The work vehicle according to claim 2,
wherein the transmission case and the power steering device are in a front portion of the travel body, and
the control valve unit is rearward of the transmission case and the power steering device in the travel body.

4. The work vehicle according to claim 2 or 3,
wherein the recovery section is attachable to and detachable from the valve case.

5. The work vehicle according to any one of claims 2 to 4,
wherein the control valve unit is on one side relative to a center of the travel body in the lateral direction of the body,
the link member is outward of the valve case in the lateral direction of the body, and
the recovery section is inward of the valve case in the lateral direction of the body.

6. The work vehicle according to any one of claims 1 to 5,
wherein the control valve unit further includes a solenoid configured to drive the control valve to be switched,
the work vehicle further comprises an additional link member extending between the operation member and the link member, and configured to transmit operating force from the operation member to the link member, and
the additional link member extends between a position corresponding to a left end portion of the solenoid and a position corresponding to a right end portion of the solenoid in the lateral direction of the body.

7. The work vehicle according to any one of claims 2 to 5,
wherein the first tubular member is upstream of the control valve unit in a direction in which the hydraulic fluid flows, and
the second tubular member is downstream of the control valve unit in the direction in which the hydraulic fluid flows.

8. The work vehicle according to any one of claims 1 to 7, further comprising:
a driver's seat,
wherein the operation member is constituted by a lever, and
the operation member is overlapped with the driver's seat in a plan view, below the driver's seat.

9. The work vehicle according to claim 8,
wherein the operation member is inclined upward and outward in the lateral direction of the body.

10. The work vehicle according to any one of claims 1 to 9, further comprising:
a driver's seat;
a control device;
a relay box housing a relay; and
a fuse box housing a fuse,
wherein the control valve unit is on one side relative to a center of the driver's seat in the lateral direction of the body,
the control device is below the driver's seat, and
the relay box and the fuse box are forward of the control valve unit.