Work equipment

Abstract

To provide a work machine that can easily perform maintenance on a link member.SOLUTION: A work machine includes: a work device that performs the ground work and can move up / down; a hydraulic cylinder that drives the work device so as to move up / down; a control valve unit 21 which has a control valve that controls the hydraulic oil to the hydraulic cylinder, a shut-off valve that blocks the flow of hydraulic oil between the hydraulic cylinder and the control valve, and a valve case 31 that houses the control valve and shut-off valve; an operation member 32 for switching the shut-off valve; and a link member 43 which transmits the operation force of the operation member 32 to the shut-off valve. The link member 43 is arranged on one side in the left-right direction of a machine body with respect to the valve case 31.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] A known example of a conventional work machine is the work machine described in Patent Document 1. The work machine described in Patent Document 1 includes a liftable work device for performing ground work, a hydraulic cylinder for driving the work device up and down, a control valve for controlling hydraulic oil to the hydraulic cylinder, a shut-off valve for shutting off the flow of hydraulic oil between the hydraulic cylinder and the control valve, a control valve unit having a valve case that houses the control valve and the shut-off valve, an operating member for switching the shut-off valve, and a link member that transmits the operating force of the operating member to the shut-off valve. The link member is disposed above the valve case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-223088 Summary of the Invention [Problem to be solved by the invention]

[0004] In the work machine described in Patent Document 1, the valve case is covered from above by another member (for example, a step or the like), so there is room for improvement in terms of facilitating maintenance of the link member.

[0005] In view of the above circumstances, there is a demand for a work machine that allows for easy maintenance of link members. [Means for solving the problem]

[0006] The present invention is characterized by: a liftable work device for performing ground work; a hydraulic cylinder that drives the working device up and down; a control valve unit including a control valve that controls hydraulic oil to the hydraulic cylinder, a shutoff valve that shuts off the flow of hydraulic oil between the hydraulic cylinder and the control valve, and a valve case that houses the control valve and the shutoff valve; an operating member for switching the shutoff valve; a link member that transmits the operating force of the operating member to the shutoff valve, The link member is disposed on one side of the valve case in the left-right direction of the aircraft body. 、 A steerable traveling machine body; A steering wheel for steering the traveling machine body; a transmission case that houses a transmission; a power steering device that is driven by hydraulic oil from the transmission case and assists steering operation by the steering wheel; a first tubular member provided between the control valve unit and the power steering device, through which hydraulic oil from the power steering device flows toward the control valve unit; a second tubular member that is provided between the control valve unit and the transmission case, and through which hydraulic oil from the control valve unit flows toward the transmission case, the control valve unit has a recovery section to which the second tubular member is connected and which recovers hydraulic oil from the valve case, The recovery section is disposed on the other side of the valve case in the left-right direction of the aircraft body. The reason is that...

[0007] Here, there is a relatively large amount of free space on one side of the valve case in the left-right direction of the machine body. According to this characteristic configuration, the link member can be disposed using the space on one side of the valve case in the left-right direction of the machine body. Furthermore, by accessing the link member from one side in the left-right direction of the machine body, maintenance of the link member can be easily performed. According to this characteristic configuration, hydraulic oil from the valve case (for example, hydraulic oil leaking from the valve case) can be recovered by the recovery section, and the recovered hydraulic oil can be returned to the transmission case via the second tubular member. Here, there is a relatively large amount of space on the other side of the valve case in the left-right direction of the machine body. According to this characteristic configuration, the recovery unit can be disposed in the space on the other side of the valve case in the left-right direction of the machine body.

[0008]

[0009]

[0010]

[0011] Furthermore, in the present invention, The transmission case and the power steering device are disposed at the front of the traveling machine body, It is preferable that the control valve unit be disposed at a location on the traveling machine body rearward of the transmission case and the power steering device.

[0012] According to this characteristic configuration, the transmission case, the power steering device, and the control valve unit can be arranged compactly in the longitudinal direction of the vehicle body.

[0013] Furthermore, in the present invention, The recovery section is preferably configured to be detachable from the valve case.

[0014] According to this characteristic configuration, the collection section can be detached and easily replaced.

[0015] Furthermore, in the present invention, The control valve unit is disposed on one side of the center of the traveling machine body in the left-right direction of the machine body, the link member is disposed on the outer side of the aircraft body in the left-right direction of the aircraft body with respect to the valve case, The recovery section is preferably disposed inside the aircraft body in the left-right direction of the aircraft body relative to the valve case.

[0016] According to this characteristic configuration, when performing maintenance on the link member, the link member can be easily accessed from outside the machine body in the left-right direction of the machine body.

[0017] Furthermore, the present invention The features of the other working machine are as follows: a liftable work device for performing ground work; a hydraulic cylinder that drives the working device up and down; a control valve unit including a control valve that controls hydraulic oil to the hydraulic cylinder, a shutoff valve that shuts off the flow of hydraulic oil between the hydraulic cylinder and the control valve, and a valve case that houses the control valve and the shutoff valve; an operating member for switching the shutoff valve; a link member that transmits the operating force of the operating member to the shutoff valve, the control valve unit has a solenoid that switches and drives the control valve; a separate link member provided between the operating member and the link member and transmitting an operating force of the operating member to the link member; The other link member extends from a position corresponding to the left end of the solenoid to a position corresponding to the right end of the solenoid in the left-right direction of the aircraft body. The thing is .

[0018] Here, there is a relatively large amount of free space on one side of the valve case in the left-right direction of the machine body. According to this characteristic configuration, the link member can be disposed using the space on one side of the valve case in the left-right direction of the machine body. Furthermore, by accessing the link member from one side in the left-right direction of the machine body, maintenance of the link member can be easily performed. According to this characteristic configuration, the separate link member can be configured without using the solenoid.

[0019] Furthermore, in the present invention, the first tubular member is disposed upstream of the control valve unit in the direction of flow of hydraulic oil, The second tubular member is preferably arranged downstream of the control valve unit in the direction of flow of hydraulic oil.

[0020] According to this characteristic configuration, the oil passage for hydraulic oil returning from the transmission case via the control valve unit is longer, thereby improving the cooling performance of the hydraulic oil.

[0021] Furthermore, the present invention The features of the other working machine are as follows: a liftable work device for performing ground work; a hydraulic cylinder that drives the working device up and down; a control valve unit including a control valve that controls hydraulic oil to the hydraulic cylinder, a shutoff valve that shuts off the flow of hydraulic oil between the hydraulic cylinder and the control valve, and a valve case that houses the control valve and the shutoff valve; an operating member for switching the shutoff valve; a link member that transmits the operating force of the operating member to the shutoff valve, the link member is disposed on one side of the valve case in the left-right direction of the aircraft body, Equipped with a driver's seat, the operating member is configured by a lever, The operating member is located below the driver's seat and overlaps with the driver's seat in a plan view. The reason is that.

[0022] Here, there is a relatively large amount of free space on one side of the valve case in the left-right direction of the machine body. According to this characteristic configuration, the link member can be disposed using the space on one side of the valve case in the left-right direction of the machine body. Furthermore, by accessing the link member from one side in the left-right direction of the machine body, maintenance of the link member can be easily performed. According to this characteristic configuration, it is possible to prevent the operating member from being accidentally touched and operated erroneously.

[0023] Furthermore, in the present invention, The operating member is preferably formed in an inclined shape such that its upper end is positioned outside the aircraft body in the left-right direction.

[0024] According to this characteristic configuration, the driver can easily operate the operating member while seated in the driver's seat.

[0025] Furthermore, the present invention The features of the other working machine are as follows: a liftable work device for performing ground work; a hydraulic cylinder that drives the working device up and down; a control valve unit including a control valve that controls hydraulic oil to the hydraulic cylinder, a shutoff valve that shuts off the flow of hydraulic oil between the hydraulic cylinder and the control valve, and a valve case that houses the control valve and the shutoff valve; an operating member for switching the shutoff valve; a link member that transmits the operating force of the operating member to the shutoff valve, the link member is disposed on one side of the valve case in the left-right direction of the aircraft body, The driver's seat and a control device; a relay box that houses a relay; a fuse box for accommodating fuses; the control valve unit is disposed on one side of the center of the driver's seat in the left-right direction of the aircraft, The control device is disposed below the driver's seat, The relay box and the fuse box are disposed in front of the control valve unit. The reason is that.

[0026] Here, there is a relatively large amount of free space on one side of the valve case in the left-right direction of the machine body. According to this characteristic configuration, the link member can be disposed using the space on one side of the valve case in the left-right direction of the machine body. Furthermore, by accessing the link member from one side in the left-right direction of the machine body, maintenance of the link member can be easily performed. According to this characteristic configuration, the space below the driver's seat can be used to place the control device, and the space in front of the control valve unit can be used to place the relay box and fuse box. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a right side view showing a riding rice transplanter. [Figure 2] FIG. 1 is a plan view showing a riding rice transplanter. [Figure 3] FIG. 2 is a diagram showing a hydraulic circuit. [Figure 4] FIG. 2 is a left side view showing the control valve unit, the hydraulic lock lever, the link mechanism, and the piping structure. [Figure 5] FIG. 2 is an exploded perspective view showing a control valve unit. [Figure 6] FIG. 10 is a left side view showing a state in which the hydraulic lock lever is operated to an open position. [Figure 7] FIG. 10 is a plan view showing a state in which the hydraulic lock lever is operated to an open position. [Figure 8] FIG. 10 is a left side view showing a state in which the hydraulic lock lever is operated to a closed position. [Figure 9] FIG. 10 is a plan view showing a state in which the hydraulic lock lever is operated to a closed position. DETAILED DESCRIPTION OF THE INVENTION

[0028] An embodiment of the present invention will be described with reference to the drawings. In the following, the direction of arrow F is defined as "forward of the aircraft body," the direction of arrow B is defined as "rearward of the aircraft body," the direction of arrow L is defined as "leftward of the aircraft body," the direction of arrow R is defined as "rightward of the aircraft body," the direction of arrow U is defined as "upward of the aircraft body," and the direction of arrow D is defined as "downward of the aircraft body."

[0029] A riding rice transplanter is shown in Figures 1 and 2. As shown in Figures 1 and 2, the riding rice transplanter includes a traveling body 1, a motor unit 2, a driving unit 3, a step 4, a planting device 5 (corresponding to the "working device" according to the present invention), a fertilizer application device 6, and a transmission unit 7.

[0030] The traveling machine body 1 is equipped with left and right front wheels 9, left and right rear wheels 10, and a machine body frame 11. The machine body frame 11 is supported by 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 rotatable. In other words, the traveling machine body 1 is configured to be steerable. The rear wheels 10 are configured to be non-steerable and rotatable.

[0031] The motor unit 2 is provided at the front of the traveling machine body 1. The motor unit 2 includes an engine (not shown) and a bonnet 12 that houses the engine.

[0032] A driver sits in the driving section 3. The driving section 3 is provided behind the driving section 2. The driving section 3 includes a driver's seat 13 and a steering wheel 14 for steering the traveling machine body 1. Steering operation by the steering wheel 14 is assisted by a power steering device 18.

[0033] The step 4 is provided on the vehicle 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 the front of the vehicle frame 11. The rear step 17 is provided around the driver's seat 13 at the rear of the vehicle frame 11. The middle step 16 is provided between the front step 15 and the rear step 17 on the vehicle frame 11.

[0035] The planting device 5 plants seedlings in the rice field. In other words, the planting device 5 performs ground work. In this embodiment, the planting device 5 is configured as an eight-row planting device. The planting device 5 is provided behind the traveling machine body 1. The planting device 5 is configured to be able to rise and fall by a link mechanism 19. The planting device 5 is supported at the rear of the machine body frame 11 via the link mechanism 19.

[0036] The link mechanism 19 is equipped with a hydraulic cylinder C that drives the planting device 5 to move up and down. When the hydraulic cylinder C extends, the planting device 5 rises. When the hydraulic cylinder C contracts, the planting device 5 descends.

[0037] The fertilizer applicator 6 supplies fertilizer to the surface of the rice field. In this embodiment, the fertilizer applicator 6 is configured as an eight-row fertilizer applicator. The fertilizer applicator 6 is provided behind the driver's seat 13 at the rear of the traveling body 1.

[0038] The transmission unit 7 changes the speed of the power from the engine. The power from the transmission unit 7 is transmitted to the left and right front wheels 9, the left and right rear wheels 10, the planting device 5, and the fertilizer application device 6. The transmission unit 7 includes a hydrostatic continuously variable transmission (not shown) and a transmission case 20. The transmission case 20 houses a gear-type transmission (not shown). The transmission unit 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 Figure 3, the riding rice transplanter has 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 oil passage 22, a second oil passage 23, a third oil passage 24, a fourth oil passage 25, a fifth oil passage 26, and a sixth oil passage 27.

[0040] The hydraulic pump P pumps out hydraulic oil from the transmission case 20. The power steering device 18 is driven by the hydraulic oil from the hydraulic pump P. That is, the power steering device 18 is driven by the hydraulic oil 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 therein.

[0042] The first oil passage 22 is provided between the hydraulic pump P and the power steering device 18. The second oil passage 23 is provided between the power steering device 18 and the control valve 28. The third oil passage 24 is provided between the control valve 28 and the shutoff valve 29. The fourth oil passage 25 is provided between the shutoff valve 29 and the hydraulic cylinder C. The fifth oil passage 26 is provided between the control valve 28 and the recovery section 30. The sixth oil passage 27 is provided between the recovery section 30 and the transmission case 20.

[0043] The hydraulic oil from the hydraulic pump P flows through a first oil passage 22, a second oil passage 23, a third oil passage 24, and a fourth oil passage 25 toward the hydraulic cylinder C. The hydraulic oil from the hydraulic cylinder C flows through the fourth oil passage 25, the third oil passage 24, a fifth oil passage 26, and a sixth oil passage 27 toward the transmission case 20.

[0044] The control valve 28 controls the hydraulic oil supplied to the hydraulic cylinder C. In this embodiment, the control valve 28 is configured as a solenoid valve. The control valve 28 is configured to be switchable between three positions. Specifically, the control valve 28 is configured to be switchable between an extension position where the hydraulic cylinder C extends, a retraction position where the hydraulic cylinder C retracts, and a neutral position where the hydraulic cylinder C stops.

[0045] The shutoff valve 29 blocks the flow of hydraulic oil between the third oil passage 24 and the fourth oil passage 25. That is, the shutoff valve 29 blocks the flow of hydraulic oil between the hydraulic cylinder C and the control valve 28. The shutoff valve 29 is configured to be switchable between two positions. Specifically, the shutoff valve 29 is configured to be switchable between an open position that connects the third oil passage 24 and the fourth oil passage 25, and a closed position that blocks the communication between the third oil passage 24 and the fourth oil passage 25. The shutoff valve 29 is operated to switch between the open position and the closed position by a hydraulic lock lever 32 (corresponding to the "operating member" according to the present invention).

[0046] The hydraulic lock lever 32 is used to switch the shutoff valve 29. The hydraulic lock lever 32 is configured to be swingable around a swing axis X1 extending along the left-right direction of the machine body. The hydraulic lock lever 32 is configured to be switchable between an open position P1, where the shutoff valve 29 is in the open position, and a closed position P2, where the shutoff valve 29 is in the closed position. A link mechanism 33 that transmits the operating force of the hydraulic lock lever 32 to the shutoff valve 29 is provided between the hydraulic lock lever 32 and the shutoff valve 29. When the hydraulic cylinder C is extended, the hydraulic lock lever 32 is switched to the closed position P2, whereby the shutoff valve 29 is switched to the closed position, and the planting device 5 is maintained in a raised state.

[0047] As shown in Figures 4 and 5, the control valve unit 21 includes a solenoid 34 that switches and drives the control valve 28 (see Figure 3). The solenoid 34 is attached to the front surface of the valve case 31. The valve case 31, the recovery section 30, and the solenoid 34 are integrated into a unit. The control valve unit 21 is supported by the aircraft frame 11.

[0048] An opening 30a is formed in the collection section 30. Hydraulic oil flows into the opening 30a from the fifth oil passage 26 (see FIG. 3). That is, the collection section 30 collects hydraulic oil from the valve case 31. The collection section 30 is attached to the left side of the valve case 31. The collection section 30 is formed of a member separate from the valve case 31. The collection section 30 is configured to be detachable from the valve case 31. The collection section 30 is arranged on the other side (left side in this embodiment) of the valve case 31 in the left-right direction of the aircraft. That is, the collection section 30 is arranged inside the aircraft body in the left-right direction of the valve case 31.

[0049] In Fig. 4, the flow direction of the hydraulic oil is indicated by arrow A. As shown in Figs. 3 and 4, a first pipe 35 (corresponding to the "first tubular member" according to the present invention) is provided between the control valve unit 21 and the power steering device 18. The first pipe 35 is provided between the valve case 31 and the power steering device 18. Through the first pipe 35, hydraulic oil from the power steering device 18 flows toward the valve case 31. In other words, through the first pipe 35, hydraulic oil from the power steering device 18 flows toward the control valve unit 21.

[0050] The first pipe 35 constitutes the second oil passage 23. An upstream end of the first pipe 35 in the flow direction A of the hydraulic oil is connected to the power steering device 18. A downstream end of the first pipe 35 in the flow direction A of the hydraulic oil is connected to the valve case 31. The first pipe 35 is disposed upstream of the control valve unit 21 in the flow direction A of the hydraulic oil.

[0051] A second pipe 36 (corresponding to the "second tubular member" according to the present invention) is provided between the control valve unit 21 and the transmission case 20. The second pipe 36 is provided between the recovery section 30 and the transmission case 20. The hydraulic oil from the recovery section 30 flows through the second pipe 36 toward the transmission case 20. In other words, the hydraulic oil from the control valve unit 21 flows through the second pipe 36 toward the transmission case 20.

[0052] The second pipe 36 constitutes the sixth oil passage 27. An upstream end of the second pipe 36 in the flow direction A of the hydraulic oil is connected to the recovery section 30. A downstream end of the second pipe 36 in the flow direction A of the hydraulic oil is connected to the transmission case 20. The second pipe 36 is disposed downstream of the control valve unit 21 in the flow direction A of the hydraulic oil.

[0053] 1, the transmission case 20 and the power steering device 18 are disposed in the front part of the traveling vehicle body 1. The control valve unit 21 is disposed in a position on the traveling vehicle body 1 rearward of the transmission case 20 and the power steering device 18. In this embodiment, the control valve unit 21 is disposed in the rear part of the traveling vehicle body 1.

[0054] 2, the center of the traveling body 1 in the left-right direction is indicated by C1, and the center of the driver's seat 13 in the left-right direction is indicated by C2. Note that the center C1 of the traveling body 1 in the left-right direction and the center C2 of the driver's seat 13 in the left-right direction are the same.

[0055] As shown in Fig. 2, the control valve unit 21 is disposed on one side (in this embodiment, the right side) of the center C2 of the driver's seat 13 in the left-right direction of the vehicle body. That is, the control valve unit 21 is disposed on one side (in this embodiment, the right side) of the center C1 of the traveling vehicle body 1 in the left-right direction of the vehicle body. The hydraulic lock lever 32 is located below the driver's seat 13 and overlaps with the driver's seat 13 in a plan view. In this embodiment, the entire hydraulic lock lever 32 overlaps with the driver's seat 13 in a plan view. The hydraulic lock lever 32 is formed in an inclined shape such that its upper end is positioned toward the outside of the vehicle body in the left-right direction (in this embodiment, the right side).

[0056] A control device 45 is disposed below the driver's seat 13. The control device 45 controls the control valve unit 21 and the like. A relay box 37 that houses a relay (not shown) and a fuse box 38 that houses a fuse (not shown) are disposed in front 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 from above by a cover 46. 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 from above, allowing maintenance of these components to be performed from above.

[0057] As shown in Figures 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 configured as a headed pin. A snap pin 41 is attached to the support shaft 39 to prevent it from coming off. The support frame 40 is formed with a bent portion 40a to allow the snap pin 41 to escape.

[0058] The link mechanism 33 includes a first link member 42 (corresponding to the "another link member" according to the present invention) and a second link member 43 (corresponding to the "link member" according to the present invention). The first link member 42 transmits the operating force of the hydraulic lock lever 32 to the second link member 43. The first link member 42 is provided across the hydraulic lock lever 32 and the second link member 43. The first link member 42 spans between a position corresponding to the left end of the solenoid 34 and a position corresponding to the right end of the solenoid 34 in the left-right direction of the aircraft body.

[0059] The second link member 43 transmits the force of the first link member 42 to the shutoff valve 29. In other words, the second link member 43 transmits the operating force of the hydraulic lock lever 32 to the shutoff valve 29. The second link member 43 is configured to be swingable around a swing axis X2 extending in the left-right direction of the aircraft body. The second link member 43 is supported by the valve case 31.

[0060] The second link member 43 is disposed on one side (in this embodiment, the right side) in the left-right direction of the aircraft body with respect to the valve case 31. In other words, the second link member 43 is disposed on the outer side of the aircraft body with respect to the valve case 31 in the left-right direction of the aircraft body.

[0061] When the hydraulic lock lever 32 is switched to the open position P1, the operating force of the hydraulic lock lever 32 is transmitted to the second link member 43 via the first link member 42. As a result, the second link member 43 is swung forward about the swing axis X2, and the shutoff valve 29 is switched to the open position.

[0062] 8 and 9, when the hydraulic lock lever 32 is switched to the closed position P2, the operating force of the hydraulic lock lever 32 is transmitted to the second link member 43 via the first link member 42. As a result, the second link member 43 is swung rearward about the swing axis X2, and the shutoff valve 29 is switched to the closed position.

[0063] A check plug 44 is provided on the upper part of the valve case 31 to allow visual confirmation of the inside of the valve case 31. The first link member 42 is formed with a bent portion 42a for allowing the check plug 44 to escape when the hydraulic lock lever 32 is switched to the closed position P2.

[0064] Another embodiment of the present invention will now be described.

[0065] (1) In the above embodiment, the second link member 43 is disposed on the right side of the valve case 31. That is, the second link member 43 is disposed on the outer side of the aircraft body in the left-right direction of the aircraft body with respect to the valve case 31. However, the second link member 43 may also be disposed on the left side of the valve case 31. That is, the second link member 43 may also be disposed on the inner side of the aircraft body in the left-right direction of the aircraft body with respect to the valve case 31.

[0066] (2) In the above embodiment, the collection unit 30 is disposed on the left side of the valve case 31. That is, the collection unit 30 is disposed inside the aircraft body in the left-right direction of the aircraft body with respect to the valve case 31. However, the collection unit 30 may also be disposed on the right side of the valve case 31. That is, the collection unit 30 may also be disposed inside or outside the aircraft body in the left-right direction of the aircraft body with respect to the valve case 31.

[0067] (3) In the above embodiment, the control valve unit 21 is disposed at the rear of the traveling body 1. However, the control valve unit 21 may be disposed at the center between the front and rear of the traveling body 1. Furthermore, the control valve unit 21 may be disposed at the front of the traveling body 1.

[0068] (4) In the above embodiment, the collection unit 30 is configured to be detachable from the valve case 31. However, the collection unit 30 may be configured to be non-detachable from the valve case 31. In other words, the collection unit 30 may be configured integrally 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 does not have to 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 entirely overlaps with the driver's seat 13 in a plan view. However, the hydraulic lock lever 32 may partially overlap with the driver's seat 13 in a plan view. Also, the hydraulic lock lever 32 may not entirely overlap 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 (for example, an electric motor, etc.). For example, the electric motor may be driven by a command from the control device 45 in response to the operation of an operating member (for example, a lever, a button, etc.), and power from the electric motor may be transmitted to the shutoff valve 29 via a link mechanism, switching the shutoff valve 29 between the open position and the closed position.

[0072] (8) In the above embodiment, the first link member 42 spans between a position corresponding to the left end and a position corresponding to the right end of the solenoid 34 in the left-right direction of the aircraft. However, the first link member 42 does not have to span between a position corresponding to the left end and a position corresponding to the right end of the solenoid 34 in the left-right direction of the aircraft. For example, the first link member 42 may be formed in a linear or substantially linear shape in the fore-aft direction of the aircraft.

[0073] (9) In the above embodiment, the hydraulic lock lever 32 is formed in an inclined shape such that its upper end is positioned toward the outside (right side) of the aircraft in the left-right direction. However, the hydraulic lock lever 32 may be formed in an inclined shape such that its upper end is positioned toward the inside (left side) of the aircraft in the left-right direction. Furthermore, the hydraulic lock lever 32 does not have to be formed in an inclined shape such that its upper end is positioned toward one side in the left-right direction of the aircraft. For example, the hydraulic lock lever 32 may be formed in a linear or approximately linear shape in the vertical direction when viewed in the fore-and-aft direction of the aircraft.

[0074] (10) In the above embodiment, the control valve unit 21 is disposed on one side (right side) of the center C2 of the driver's seat 13 in the left-right direction of the vehicle body. That is, the control valve unit 21 is disposed on one side (right side) of the center C1 of the traveling vehicle body 1 in the left-right direction of the vehicle body. However, the control valve unit 21 may be disposed on the other side (left side) of the center C2 of the driver's seat 13 in the left-right direction of the vehicle body. That is, the control valve unit 21 may be disposed on the other side (left side) of the center C1 of the traveling vehicle body 1 in the left-right direction of the vehicle body.

[0075] (11) In the above embodiment, the control device 45 is disposed below the driver's seat 13 . However, the control device 45 may be disposed in a location other than below the driver's seat 13.

[0076] (12) In the above embodiment, the relay box 37 and the fuse box 38 are disposed in front of the control valve unit 21. However, the relay box 37 and the fuse box 38 may be disposed in a location other than in front of the control valve unit 21.

[0077] (13) In the above embodiment, the planting device 5 is configured as 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 configured as a four-row, six-row, or ten-row planting device.

[0078] (14) In the above embodiment, the fertilizer applicator 6 is configured as an eight-row fertilizer applicator. However, the fertilizer applicator 6 is not limited to an eight-row fertilizer applicator. For example, the fertilizer applicator 6 may be configured as a four-row, six-row, or ten-row fertilizer applicator. [Industrial Applicability]

[0079] The present invention can be used not only for riding rice transplanters but also for combine harvesters and tractors. [Explanation of symbols]

[0080] 1 Running body 5 Planting equipment (work equipment) 13 Driver's seat 14 Steering wheel 18 Power steering device 20-speed case 21 Control valve unit 28 Control valve 29 Shut-off valve 30 Collection Department 31 Valve case 32 Hydraulic lock lever (operating member) 34 Solenoid 35 First piping (first tubular member) 36 Second piping (second tubular member) 37 Relay box 38 Fuse box 42 first link member (another link member) 43 Second link member (link member) 45 Control Device A Flow direction of hydraulic oil C Hydraulic cylinder C1 Center of the running body in the left-right direction C2 Center of the driver's seat in the lateral direction of the aircraft

Claims

1. a liftable work device for performing ground work; a hydraulic cylinder that drives the working device up and down; a control valve unit including a control valve that controls hydraulic oil to the hydraulic cylinder, a shutoff valve that shuts off the flow of hydraulic oil between the hydraulic cylinder and the control valve, and a valve case that houses the control valve and the shutoff valve; an operating member for switching the shutoff valve; a link member that transmits the operating force of the operating member to the shutoff valve, the link member is disposed on one side of the valve case in the left-right direction of the aircraft body, A steerable traveling machine body; A steering wheel for steering the traveling machine body; a transmission case that houses a transmission; a power steering device that is driven by hydraulic oil from the transmission case and assists steering operation by the steering wheel; a first tubular member provided between the control valve unit and the power steering device, through which hydraulic oil from the power steering device flows toward the control valve unit; a second tubular member that is provided between the control valve unit and the transmission case, and through which hydraulic oil from the control valve unit flows toward the transmission case, the control valve unit has a recovery section to which the second tubular member is connected and which recovers hydraulic oil from the valve case, The recovery section is disposed on the other side of the valve case in the left-right direction of the machine body.

2. The transmission case and the power steering device are disposed at the front of the traveling machine body, The work machine according to claim 1, wherein the control valve unit is disposed at a location on the traveling machine body rearward of the transmission case and the power steering device.

3. 3. The work machine according to claim 1, wherein the recovery section is configured to be detachable from the valve case.

4. The control valve unit is disposed on one side of the center of the traveling machine body in the left-right direction of the machine body, the link member is disposed on the outer side of the aircraft body in the left-right direction of the aircraft body with respect to the valve case, The work machine according to claim 1 or 2, wherein the recovery section is disposed inside the machine body in the left-right direction of the machine body relative to the valve case.

5. The first tubular member is arranged upstream of the control valve unit in the flow direction of hydraulic oil, 3. The work machine according to claim 1, wherein the second tubular member is disposed downstream of the control valve unit in the direction of flow of hydraulic oil.

6. A liftable work device for performing ground work; a hydraulic cylinder that drives the working device up and down; a control valve unit including a control valve that controls hydraulic oil to the hydraulic cylinder, a shutoff valve that shuts off the flow of hydraulic oil between the hydraulic cylinder and the control valve, and a valve case that houses the control valve and the shutoff valve; an operating member for switching the shutoff valve; a link member that transmits the operating force of the operating member to the shutoff valve, the link member is disposed on one side of the valve case in the left-right direction of the aircraft body, the control valve unit has a solenoid that switches and drives the control valve; a separate link member provided between the operating member and the link member and transmitting an operating force of the operating member to the link member; The other link member extends from a position corresponding to a left end of the solenoid to a position corresponding to a right end of the solenoid in the left-right direction of the machine body.

7. A liftable work device for performing ground work; a hydraulic cylinder that drives the working device up and down; a control valve unit including a control valve that controls hydraulic oil to the hydraulic cylinder, a shutoff valve that shuts off the flow of hydraulic oil between the hydraulic cylinder and the control valve, and a valve case that houses the control valve and the shutoff valve; an operating member for switching the shutoff valve; a link member that transmits the operating force of the operating member to the shutoff valve, the link member is disposed on one side of the valve case in the left-right direction of the aircraft body, Equipped with a driver's seat, the operating member is configured by a lever, The operating member is located below the operator's seat and overlaps with the operator's seat in a plan view.

8. 8. The work machine according to claim 7, wherein the operating member is formed in an inclined shape such that an upper end thereof is positioned outward of the machine body in the left-right direction of the machine body.

9. A liftable work device for performing ground work; a hydraulic cylinder that drives the working device up and down; a control valve unit including a control valve that controls hydraulic oil to the hydraulic cylinder, a shutoff valve that shuts off the flow of hydraulic oil between the hydraulic cylinder and the control valve, and a valve case that houses the control valve and the shutoff valve; an operating member for switching the shutoff valve; a link member that transmits the operating force of the operating member to the shutoff valve, the link member is disposed on one side of the valve case in the left-right direction of the aircraft body, The driver's seat and a control device; a relay box that houses a relay; a fuse box for accommodating fuses; the control valve unit is disposed on one side of the center of the driver's seat in the left-right direction of the aircraft, The control device is disposed below the driver's seat, The work machine, wherein the relay box and the fuse box are disposed in front of the control valve unit.

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