JP7806640B2 - Work vehicles - Google Patents

Description

The present invention relates to a work vehicle.

Conventionally, in work vehicles that are equipped with a traveling body and a work implement attached to the traveling body and that perform work in fields, etc., a control valve that controls the hydraulic equipment of the work implement, an operating lever for operating the control valve, and a link mechanism that connects the control valve and operating lever are positioned below the driver's seat so that they overlap with the driver's seat in a plan view of the vehicle (see, for example, Patent Document 1).

Patent No. 4996344

Although conventional work vehicles such as those described above allow for efficient placement of control valves, operating levers, and link mechanisms, the driver's seat is located above the link mechanism, and the operating lever protrudes forward from the mounting part (base end). This requires the driver sitting in the driver's seat to extend their arm to operate the operating lever, resulting in poor operability of the operating lever and, further, poor operability of the hydraulic equipment (work machinery).

The present invention was made in consideration of the above, and aims to provide a work vehicle that can improve the operability of operating levers and hydraulic equipment.

In order to solve the above-mentioned problems and achieve the objectives, the work vehicle (1) according to the embodiment comprises a traveling body (2) having a driver's seat (27), hydraulic equipment (33) driven by hydraulic pressure, a hydraulic connection (6) that drivably connects the hydraulic equipment (33) to the traveling body (2), a control valve (51) that controls the hydraulic oil supplied to the hydraulic connection (60), and an operating lever (41) for operating the control valve (51), wherein the operating lever (41) is located to the side of the driver's seat (27) and protrudes upward from below a mounting surface (271) to which the driver's seat (27) is attached, to the side of the driver's seat (27).

The work vehicle according to this embodiment can improve the operability of the control levers and hydraulic equipment.

FIG. 1 is a schematic right side view showing a work vehicle according to an embodiment. FIG. 2A is a first explanatory diagram of the positional relationship between the driver's seat and the operation lever of the work vehicle according to the embodiment. FIG. 2B is a second explanatory diagram of the positional relationship between the driver's seat and the operation lever of the work vehicle according to the embodiment. FIG. 3 is a perspective view showing the transmission case and the lever device. FIG. 4 is a perspective view showing the control valve unit. FIG. 5 is a rear view showing the control valve unit. FIG. 6 is a perspective view (part 1) showing the lever device. FIG. 7 is a perspective view (part 2) showing the lever device. FIG. 8 is a perspective view (part 1) showing the locking mechanism. FIG. 9 is a perspective view (part 2) showing the locking mechanism.

Embodiments of the work vehicle disclosed herein will be described in detail below with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments described below.

<Overall configuration of the work vehicle>
The overall configuration of a work vehicle 1 according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic right side view showing a work vehicle 1 according to an embodiment. Fig. 1 shows an example of a work vehicle 1 (a tractor, which will be described later).

Furthermore, each figure, including Figure 1, shows a three-dimensional Cartesian coordinate system including a Z-axis whose positive direction is vertically upward (upward). Below, the positive direction of the X-axis is defined as the left, the negative direction of the X-axis as the right, the positive direction of the Y-axis as the forward direction, and the negative direction of the Y-axis as the backward direction, and the X-axis direction may also be referred to as the left-right direction, the Y-axis direction as the front-back direction, and the Z-axis direction as the up-down direction.

The work vehicle 1 is capable of traveling within a field F and performs work in this field F. In the following, an agricultural tractor will be used as an example of the work vehicle 1. A driver (also referred to as a worker) rides in the agricultural tractor (hereinafter referred to as the tractor) 1, which is a work vehicle, and performs work in the field F. Note that in the following, the tractor 1 and the traveling vehicle body 2, which will be described later, may also be referred to as the "machine."

As shown in FIG. 1, the tractor 1 comprises a traveling body 2 and a work implement 3. The traveling body 2 is capable of traveling within a field F and comprises front wheels 21 and rear wheels 22. The front wheels 21 are provided in a pair on the left and right and are used for steering. The rear wheels 22 are provided in a pair on the left and right and are used for driving (drive wheels). Note that the traveling body 2 may also be provided with traveling crawlers, for example, instead of wheels (front wheels 21 and rear wheels 22).

The rotational power generated by an engine (not shown), which serves as a drive source housed in the hood 23, is transmitted to the rear wheels 22, which serve as drive wheels, after being appropriately reduced in speed by a transmission (not shown) provided in a transmission case 24. The rear wheels 22 are driven by the rotational power transmitted from the engine. The transmission switches the rotational power transmitted from the engine to one of multiple gears.

The vehicle body 2 may also be configured to transmit power generated by the engine and reduced by the transmission to the front wheels 21 via a 4WD clutch. In this case, when the 4WD clutch transmits power, the power transmitted from the engine drives all four wheels, the front wheels 21 and the rear wheels 22. When the 4WD clutch cuts off the transmission of power, only the rear wheels 22 are driven by the power transmitted from the engine.

The vehicle body 2 also includes a steering column 25 and a steering wheel 26 behind the hood 23. The vehicle body 2 also includes a driver's seat 27 above the transmission case 24 where the driver sits. The vehicle body 2 also includes fenders 28 extending from above the left and right rear wheels 22 to the front to cover the left and right rear wheels 22. The vehicle body 2 also includes various operating pedals (not shown), such as an accelerator pedal, brake pedal, and clutch pedal, near the feet of the driver seated in the driver's seat 27.

As shown in FIG. 1, the traveling vehicle body 2 is equipped with a work implement 3 that performs work in the field. The work implement 3 is, for example, a so-called front loader that is connected to the vehicle frame 29 of the traveling vehicle body 2 and performs work in front of the traveling vehicle body 2.

The work implement 3 comprises a boom 31, a bucket 32, and hydraulic equipment 33. The boom 31 is attached to the vehicle frame 29 via a fixing part 291. The bucket 32, which is used for earth removal work, is attached to the tip (front end) of the boom 31.

The hydraulic equipment 33 is driven by hydraulic pressure generated by hydraulic oil supplied to the hydraulic connection unit 60 (see Figure 3), which will be described later. The hydraulic equipment 33 is, for example, a hydraulic cylinder. The hydraulic cylinder 33, which is a hydraulic equipment, includes a boom cylinder 331 and a bucket cylinder 332.

One end (rod) of the boom cylinder 331 is attached to the fixed part 291, and the other end is attached to the middle part of the boom 31. The boom cylinder 331 rotates the boom 31 up and down by extending and retracting the rod, thereby raising and lowering the bucket 32. The bucket cylinder 332 has one end (rod) attached to the upper rear surface of the bucket 32, and the other end is attached to the middle part of the boom 31. The bucket cylinder 332 rotates the bucket 32 up and down by extending and retracting the rod.

As shown in FIG. 1, the tractor 1 also includes a lever device 40. The lever device 40 includes an operating lever 41. The operating lever 41 is an operating tool used by the driver to operate a control valve 51 (see FIG. 4) of a control valve unit 50 (see FIG. 3), which will be described later.

<Operation lever layout>
Next, the arrangement of the operating lever 41 will be described with reference to Figures 2A, 2B, and 3. Figures 2A and 2B are explanatory diagrams of the positional relationship between the driver's seat 27 and the operating lever 41 of the work vehicle 1 according to this embodiment. Note that Figure 2A shows the right side of the driver's seat 27 and the operating lever 41. Also, Figure 2B shows a plan view of the driver's seat 27 and the operating lever 41. Figure 3 is a perspective view showing the transmission case 24 and the lever device 40.

As shown in FIG. 2A, the lever device 40 is provided above the transmission case 24. The transmission case 24 is provided below the driver's seat 27. As shown in FIG. 3, the transmission case 24 includes a clutch housing 241, an intermediate frame 242, a front transmission case 243, and a rear transmission case 244. The transmission case 24 is a housing that is long in the front-to-rear direction, with the clutch housing 241, intermediate frame 242, front transmission case 243, and rear transmission case 244 assembled together with fasteners such as bolts.

As shown in FIG. 2A, the lever device 40 is provided above the front transmission case 243. The operating lever 41 is provided so as to protrude upward from a mounting portion 412 (see FIGS. 6 and 7), which will be described later. The operating lever 41 is a joystick lever that can be tilted in the same plane, including forward, backward, left, and right, as will be described later.

As shown in Figures 2A and 2B, the operating lever 41 is located to the right of the driver's seat 27. The operating lever 41 also protrudes upward from below the mounting surface 271, which is used to mount the driver's seat 27 to the vehicle body 2, on the right side of the driver's seat 27. Therefore, the grip portion 411 that the driver grasps when operating the operating lever 41 is located to the right of the driver's seat 27 so that the driver can grasp it with their arm bent, i.e., so that the driver can grasp and operate it without having to extend their arm.

In addition, a gearshift lever (not shown) for changing the vehicle's traveling speed is located to the left of the driver's seat 27.

As shown in Figure 3, in addition to the lever device 40 described above, the tractor 1 (see Figure 1) also includes a control valve unit 50 and a hydraulic coupling 60.

<Control valve unit and hydraulic connection>
Next, the control valve unit 50 and the hydraulic connecting portion 60 will be described with reference to Figures 3 to 5. Figure 4 is a perspective view showing the control valve unit 50. Note that Figure 4 shows the control valve unit 50 as seen from behind and diagonally above. Figure 5 is a rear view showing the control valve unit 50.

As shown in Figures 4 and 5, the control valve unit 50 includes a control valve (hereinafter referred to as a joy valve) 51. The joy valve 51 is operated by the driver's operation of the control lever 41, and controls the amount of hydraulic oil supplied to the hydraulic connection part 60 according to the amount of operation of the control lever 41.

As shown in Figure 3, the hydraulic coupling unit 60 drivably couples the hydraulic equipment (hydraulic cylinder) 33 to the traveling vehicle body 2 (see Figure 1). The hydraulic coupling unit 60 has a coupler that can supply hydraulic oil to the hydraulic equipment (hydraulic cylinder) 33. The boom cylinder 331 (see Figure 1) is connected to the hydraulic coupling unit 60 so that hydraulic oil can be supplied thereto. In addition, the bucket cylinder 332 (see Figure 1) is connected to the hydraulic coupling unit 60 so that hydraulic oil can be supplied thereto.

As shown in Figures 4 and 5, the control valve unit 50 is located below the driver's seat 27 and to the right of the driver's seat 27. As shown in Figures 4 and 5, the control valve unit 50 includes the joy valve 51 described above, as well as a relief valve 52 and a block member 53. The relief valve 52 is a valve that opens to release hydraulic oil to avoid an overpressure state in the joy valve 51.

The block member 53 comprises a joy metal 531 and a relief metal 532. The joy metal 51a is a block-shaped member in which an oil passage (not shown) for providing the joy valve 51 is formed. The relief metal 532 is a block-shaped member in which an oil passage (not shown) for providing the relief valve 52 is formed.

The control valve unit 50 (joy valve 51) is attached to the front mission case 243 of the transmission case 24, with the block member 53 sandwiched between the block member 53 and the front mission case 243 in the left-right direction. The control valve unit 50 (joy valve 51) is also attached to the left of the fender 28, which is closer to the inside of the aircraft than the fender 28.

<Lever device>
Next, the lever device 40 will be described with reference to Figures 6 and 7. Figures 6 and 7 are perspective views of the lever device 40. Note that Figure 6 shows the lever device 40 as viewed from the front and diagonally above. Figure 7 shows the lever device 40 as viewed from the rear and diagonally above.

As shown in Figures 6 and 7, the lever device 40 includes the above-mentioned operating lever 41, link portion 42, joint portion 43, bracket member 44, and locking mechanism 45. The operating lever 41 includes the above-mentioned grip portion 411 (see Figure 3) and mounting portion 412.

The grip portion 411 is the part that the driver grasps when operating the control lever 41, and is provided at the upper end of the main body of the control lever 41. The attachment portion 412 is fixed to the lower end of the main body of the control lever 41, for example, by welding. The control lever 41 is attached to the link plate 421 (described below) by fixing the attachment portion 412 to the upper surface of the link plate 421 with fasteners such as bolts.

Furthermore, the mounting portion 412 is located to the right of the mounting surface 271 (see Figure 2A) of the driver's seat 27 when viewed from above the aircraft. Furthermore, the lever device 40 is open above the mounting portion 412.

The operating lever 41 is a joystick lever that can be tilted in radial directions (360° within the same plane) around the mounting part 412 via the joint part 43 (described below). Note that the movable range of the operating lever 41 is restricted by the link part 42 (described below) to which the operating lever 41 is connected, so it can actually be tilted forward, backward, left, and right.

As shown in Figures 2A and 2B, the operating lever 41, once assembled, rises upward from the mounting portion 412, then extends upward while curving to the right of the driver's seat 27, and then slightly changes direction toward the driver's seat 27 (left) halfway through. Therefore, the grip portion 411 of the operating lever 41 is positioned in a way that is suitable for the driver seated in the driver's seat 27 to grasp with their right hand.

Furthermore, as shown in Figure 2A, the operating lever 41 is attached to a link portion 42 (described below) that connects to the control valve 51 below the mounting surface 271 of the driver's seat 27.

Returning to Figures 6 and 7, the link portion 42 includes a link plate 421 and spools 422a and 422b. The link plate 421 is a plate-shaped member, and as described above, the mounting portion 412 of the operating lever 41 is fixed to the upper surface of the link plate 421 with a fastener such as a bolt.

The link plate 421 includes spool connectors 4211a and 4211b and a lock plate 4212. The spool connectors 4211a and 4211b are both plate-shaped members that protrude downward from one end of the underside of the link plate 421. The base end of the spool 422a is connected to the spool connector 4211a so that it can rotate in the front-to-rear direction. The base end of the spool 422b is connected to the spool connector 4211b so that it can rotate in the left-to-right direction.

As described above, the base ends of the spools 422a and 422b are connected to the spool connectors 4211a and 4211b, respectively, and the tip ends are connected to the drive units 511a and 511b of the joy valve 51.

In addition, spools 422a and 422b are each provided with an adjuster 423. The adjuster 423 is a member that allows the length of spools 422a and 422b to be adjusted, and is provided at a midpoint on spools 422a and 422b.

The lock plate 4212 is a plate-shaped member that protrudes downward from the other end of the underside of the link plate 421. The lock plate 4212 is a component of the lock mechanism 45 (described later) that locks the operating lever 41, and has a lock hole 4212a formed so that the lock pin 452 (described later) of the lock mechanism 45 can be inserted. The lock mechanism 45 will be described later using Figures 8 and 9.

The joint portion 43 is a universal joint, and as described above, allows tilting operation around the base end (mounting portion 412) of the operating lever 41. The joint portion 43 is provided below the underside of the link plate 421. The upper end of the joint portion 43 is fixed to the link plate 421 via a fixing pin 431 by welding or the like. The lower end of the joint portion 43 is fixed to the bracket member 44, which will be described later. The joint portion 43 is covered with a bellows-shaped cover 432. The interior of the cover 432 is filled with lubricating oil.

The bracket member 44 includes a rear bracket portion 441, an intermediate portion 442, and a front bracket portion 443. The rear bracket portion 441 is a plate-shaped member that is disposed below the link plate 421 so as to sandwich the joint portion 43 together with the link plate 421 in the vertical direction. The joint portion 43 is fixed to the upper surface of the rear bracket portion 441. In addition, the lock cylinder 451, lock pin 452, lock lever 453, and other components of the locking mechanism 45 (described below) are disposed on the upper surface of the rear bracket portion 441.

The intermediate portion 442 is a plate member extending in the vertical direction, with its rear end fixed to the rear bracket portion 441 and its front end fixed to the front bracket portion 443. The front bracket portion 443 is a plate-shaped member extending in the left-right direction along the outer shape of the front mission case 243 of the transmission case 24, and is fixed to the front mission case 243 with fasteners such as bolts. Therefore, the link plate 421 is attached via the joint portion 43 to a bracket member 44 fixed to the transmission case 24 (front mission case 243). The front bracket portion 443 is fixed to the front mission case 243 on a boss (protrusion) provided on the outer surface of the front mission case 243.

<Locking mechanism>
Next, the locking mechanism 45 will be described with reference to Figures 8 and 9. Figures 8 and 9 are perspective views of the locking mechanism 45. Figure 8 shows the locking mechanism 45 as seen from the front and diagonally above. Figure 9 shows the locking mechanism 45 as seen from the right side and diagonally above.

As shown in Figures 8 and 9, the locking mechanism 45 includes the lock plate 4212, lock cylinder 451, lock pin 452, lock lever 453, restricting plate 454, and biasing member 455.

The lock cylinder 451 is a cylindrical member that is mounted on the upper surface of the rear bracket portion 441, as described above. The lock cylinder 451 houses a lock pin 452. In this type of lock cylinder 451, the lock pin 452 advances from an opening at one end facing the lock plate 4212 toward the lock hole 4212a in response to operation of the lock lever 453, which will be described later.

The lock pin 452 is movably mounted at one end opening of the lock cylinder 451. The lock pin 452 extends from the lock cylinder 451 and is inserted into the lock hole 4212a of the lock plate 4212.

The lock lever 453 is an operating tool for operating the lock mechanism 45, and is connected to the lock pin 452 housed in the lock cylinder 451 at the other end opening of the lock cylinder 451. Therefore, when the driver or other person operates the lock lever 453 to the right, the lock pin 452 advances, and when the driver or other person operates the lock lever 453 to the left, the advanced lock pin 452 retracts.

The restricting plate 454 is a plate-shaped member. The restricting plate 454 has a groove 4541. The groove 4541 is formed in an L-shape with its long side extending in the left-right direction, and restricts the lock lever 453 inserted into the groove 4541 so that the lock lever 453 can move in the left-right direction.

The biasing member 455 is a spring (tension coil spring) with one end fixed to the rear bracket portion 441 and the other end fixed to the lock lever 453. The biasing member 455 constantly biases the lock lever 453 to the right. In other words, the lock pin 452 remains inserted in the lock hole 4212a of the lock plate 4212. When the lock lever 453 is operated (moved leftward) against the biasing force of the biasing member 455, the lock provided by the lock pin 452 is released. Furthermore, when the lock lever 453 moves downward along the short side of the L-shaped groove 4541, the lock lever 453 remains in the unlocked state.

The locking mechanism 45 is located inward of the link plate 421 (to the right, i.e., inward in the left-right direction of the vehicle). The locking lever 453 is located below the driver's seat 27, as shown in Figure 2A.

In the embodiment described above, the operating lever 41 is located to the side of the driver's seat 27 and protrudes upward on the right side of the driver's seat 27, allowing the driver seated in the driver's seat 27 to operate the operating lever 41 close to his or her body. This allows the driver to operate the hydraulic equipment 33 (work equipment 3) using the operating lever 41 in a stable posture. This improves the operability of the operating lever 41, and further improves the operability of the hydraulic equipment 33 (work equipment 3). Furthermore, because the operating lever 41 protrudes from below the mounting surface 271 of the driver's seat 27, the operating lever 41 can be installed in the narrow space to the side of the driver's seat 27.

In addition, the mounting portion 412 of the operating lever 41 is located to the right of the mounting surface 271 of the driver's seat 27, and the top of the mounting portion 412 of the operating lever 41 is open, making the mounting portion 412 of the operating lever 41 accessible from above. This makes it easy to attach and detach the operating lever 41 and related components, and also makes adjustments after assembly easy.

In addition, the joy valve 51 is attached to the transmission case 24 via the block member 53, and the link plate 421 is attached to the bracket member 44 that is fixed to the transmission case 24. This allows the entire operating system, from the joy valve 51 to the operating lever 41, to be attached to the transmission case 24 before parts such as the fender 28 are attached. This simplifies assembly.

In addition, since the lock lever 453 of the lock mechanism 45 is located below the driver's seat 27, when operation of the operating lever 41 is not necessary, the operating lever 41 can be locked by operating the lock lever 453 located below the driver's seat 27.

In the above embodiment, the work implement 3 is a front loader that performs work in front of the traveling body 2, but this is not limited to this and may be, for example, a rotary tiller that performs work behind the traveling body 2.

In addition, in the above embodiment, the hydraulic equipment 33 operated by the operating lever 41 via the joy valve 51 is the hydraulic cylinder of the work machine 3, but this is not limited to this, and the hydraulic equipment used other than the work machine 3 may also be the object to be operated.

The above-described embodiment realizes the following work vehicle 1.

(1) A work vehicle 1 comprising a traveling body 2 having a driver's seat 27, hydraulic equipment 33 driven by hydraulic pressure, a hydraulic coupling 60 that drivably couples the hydraulic equipment 33 to the traveling body 2, a control valve 51 that controls the hydraulic oil supplied to the hydraulic coupling 60, and an operating lever 41 for operating the control valve 51, the operating lever 41 being disposed to the side of the driver's seat 27 and projecting upward from below a mounting surface 271 to which the driver's seat 27 is attached, to the side of the driver's seat 27.

With this type of work vehicle 1, the operating lever 41 is located to the side of the driver's seat 27 and protrudes upward to the side of the driver's seat 27, allowing the driver seated in the driver's seat 27 to operate the operating lever 41 close to his or her body. This allows the driver to operate the hydraulic equipment 33 (work equipment 3) using the operating lever 41 in a stable position. This improves the operability of the operating lever 41, and further improves the operability of the hydraulic equipment 33 (work equipment 3). Furthermore, because the operating lever 41 protrudes from below the mounting surface 271 of the driver's seat 27, the operating lever 41 can be installed in the narrow space to the side of the driver's seat 27.

(2) In the work vehicle 1 described above in (1), the operating lever 41 is attached to a link portion 42 that connects to the control valve 51 below the mounting surface 271 of the driver's seat 27, and the mounting portion 412 of the operating lever 41 to the link portion 42 is located to the side of the mounting surface 271 in a plan view of the vehicle body, and is open at the top.

With this type of work vehicle 1, in addition to the effect of (1) above, the mounting portion 412 of the operating lever 41 is located to the side of the mounting surface 271 of the driver's seat 27, and the top of the mounting portion 412 of the operating lever 41 is open, making the mounting portion 412 of the operating lever 41 accessible from above. This makes it easy to attach and detach the operating lever 41 and related components, and also makes adjustments after assembly easy.

(3) In the work vehicle 1 described above in (2), the link portion 42 has a link plate 421 to which the mounting portion 412 of the operating lever 41 is fixed, the control valve 51 is attached to the transmission case 24 across a block member 53 having an oil passage in which the relief valve 52 is provided, and the link plate 421 is attached via the joint portion 43 to a bracket member 44 fixed to the transmission case 24.

With this type of work vehicle 1, in addition to the effect of (2) above, the entire operating system, from the control valve 51 to the operating lever 41, can be attached to the transmission case 24 before attaching parts such as the fender 28. This makes assembly easier.

(4) A work vehicle 1 according to (3) above, further comprising a locking mechanism 45 that locks the operating lever 41 and a locking lever 453 for operating the locking mechanism 45, the locking mechanism 45 being positioned inward of the link plate 421, the operating lever 41 being locked by a locking pin 452 being inserted into a locking plate 4212 that extends downward from the underside of the link plate 421, and the locking lever 453 being positioned below the driver's seat 27.

In addition to the effect of (3) above, with this type of work vehicle 1, when operation of the operating lever 41 is not necessary, the operating lever 41 can be locked by operating the lock lever 453 located below the driver's seat 27.

Further advantages and modifications may readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

1. Work vehicle (tractor)
2 Traveling vehicle body 24 Transmission case 27 Driver's seat 271 Mounting surface 33 Hydraulic equipment (hydraulic cylinder)
41 Operating lever 412 Mounting portion 42 Link portion 421 Link plate 4212 Lock plate 43 Joint portion 44 Bracket member 45 Lock mechanism 452 Lock pin 453 Lock lever 51 Control valve (Joy valve)
52 Relief valve 53 Block member 60 Hydraulic coupling portion

Claims (2)

a traveling vehicle body having a driver's seat;
a hydraulic device driven by hydraulic pressure;
a hydraulic coupling section that drivably couples the hydraulic equipment to the traveling vehicle body;
a control valve for controlling hydraulic fluid supplied to the hydraulic coupling;
an operating lever for operating the control valve,
the operating lever is disposed on the side of the driver's seat and protrudes upward from below a mounting surface to which the driver's seat is attached at the side of the driver's seat ,
the operating lever is attached to a link portion that is connected to the control valve below the mounting surface of the driver's seat,
an attachment portion of the operating lever to the link portion is disposed to the side of the attachment surface in a plane view of the aircraft body, and has an open upper portion;
the link portion has a link plate to which the mounting portion of the operating lever is fixed,
The control valve is attached to the transmission case across a block member having an oil passage in which a relief valve is provided,
The work vehicle , wherein the link plate is attached via a joint to a bracket member fixed to the transmission case . a locking mechanism that locks the operating lever;
a lock lever for operating the lock mechanism,
the lock mechanism is disposed inward of the link plate, and locks the operating lever by inserting a lock pin into a lock plate extending downward from the underside of the link plate;
The work vehicle according to claim 1 , wherein the lock lever is disposed below the driver's seat.