Work vehicles

Abstract

To provide a work vehicle improved in operability of an operation lever and hydraulic equipment.SOLUTION: A work vehicle related to an embodiment has a traveling vehicle body, hydraulic equipment, a hydraulic pressure connection part, a control valve and an operation lever. The traveling vehicle body has a cab seat. The hydraulic equipment is driven by hydraulic pressure. The hydraulic pressure connection part drivably connects the hydraulic equipment to the traveling vehicle body. The control valve controls hydraulic fluid supplied to the hydraulic pressure connection part. The operation lever operates the control valve, is arranged at a lateral side of the cab seat, and is protruded upward from a lower part of a fitting face fitted with the cab seat at the lateral side of the cab seat.SELECTED DRAWING: Figure 2A

Description

[Technical Field]

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

[0002] Conventionally, in a work vehicle that is equipped with a running body and a work implement attached to the running body and that performs 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 the operating lever are arranged below the driver's seat so that they overlap with the driver's seat when viewed from above the vehicle (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4996344 Summary of the Invention [Problem to be solved by the invention]

[0004] Although the conventional work vehicles described above allow for efficient placement of the control valve, operating lever, and link mechanism, the driver's seat is located above the link mechanism, and the operating lever protrudes forward from the mounting part (base end). This means that the driver sitting in the driver's seat must extend his or her arm to operate the operating lever, which results in poor operability of the operating lever and, further, poor operability of the hydraulic equipment (work machinery).

[0005] The present invention has been made in view of the above, and has an object to provide a work vehicle that can improve the operability of operating levers and hydraulic equipment. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, 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 part (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 part (60), and an operating lever (41) for operating the control valve (51), wherein the operating lever (41) is arranged 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 on the side of the driver's seat (27). [Effects of the Invention]

[0007] According to the work vehicle according to this embodiment, the operability of the control lever and the hydraulic equipment can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic right side view showing a work vehicle according to an embodiment. [Figure 2A] FIG. 2A is an explanatory diagram (part 1) of the positional relationship between the driver's seat and the operation lever of the work vehicle according to the embodiment. [Figure 2B] FIG. 2B is a second explanatory diagram of the positional relationship between the driver's seat and the operating lever of the work vehicle according to the embodiment. [Figure 3] FIG. 3 is a perspective view showing the transmission case and the lever device. [Figure 4] FIG. 4 is a perspective view showing a control valve unit. [Figure 5] FIG. 5 is a rear view showing the control valve unit. [Figure 6] FIG. 6 is a perspective view (part 1) showing the lever device. [Figure 7] FIG. 7 is a perspective view (part 2) showing the lever device. [Figure 8] FIG. 8 is a perspective view (part 1) showing the locking mechanism. [Figure 9]FIG. 9 is a perspective view (part 2) showing the locking mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the work vehicle disclosed in the present application will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below.

[0010] <Overall configuration of the work vehicle> The overall configuration of a work vehicle 1 according to an embodiment will be described with reference to Figure 1. Figure 1 is a schematic right side view showing a work vehicle 1 according to an embodiment. Note that Figure 1 shows an example of a work vehicle 1 (a tractor, which will be described later).

[0011] 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 front, and the negative direction of the Y-axis as the rear, and the X-axis direction may be referred to as the left-right direction, the Y-axis as the front-back direction, and the Z-axis as the up-down direction.

[0012] 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 be referred to as the "machine".

[0013] 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 be provided with traveling crawlers, for example, instead of wheels (front wheels 21 and rear wheels 22).

[0014] Rotational power generated by an engine (not shown) serving as a drive source housed in a hood 23 is transmitted to rear wheels 22, which are drive wheels, after being appropriately reduced in speed by a speed change device (transmission) (not shown) provided in a transmission case 24. The rear wheels 22 are driven by the rotational power transmitted from the engine. The speed change device switches the rotational power transmitted from the engine to one of a plurality of gear stages.

[0015] The traveling vehicle body 2 may be configured so that power generated by the engine and reduced by the transmission can also be transmitted to the front wheels 21 via a 4WD clutch. In this case, when the 4WD clutch transmits power, the four wheels, the front wheels 21 and the rear wheels 22, are driven by the power transmitted from the engine. When the 4WD clutch cuts off the transmission of power, only the two wheels, the rear wheels 22, are driven by the power transmitted from the engine.

[0016] 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 for the driver to sit in above the transmission case 24. The vehicle body 2 also includes fenders 28 that extend from above the left and right rear wheels 22 to the front so as 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, a brake pedal, and a clutch pedal, near the feet of the driver seated in the driver's seat 27.

[0017] 1, a work implement 3 that performs work in a field is attached to the traveling body 2. The work implement 3 is, for example, a so-called front loader that is connected to a body frame 29 of the traveling body 2 and performs work in front of the traveling body 2.

[0018] The work implement 3 includes a boom 31, a bucket 32, and hydraulic equipment 33. The boom 31 is attached to the vehicle body frame 29 via a fixing part 291. The bucket 32 ​​is used for earth removal work and is attached to the tip (front end) of the boom 31.

[0019] The hydraulic device 33 is driven by hydraulic pressure generated by hydraulic oil supplied to a hydraulic coupling unit 60 (see FIG. 3 ), which will be described later. The hydraulic device 33 is, for example, a hydraulic cylinder. The hydraulic cylinder 33, which is a hydraulic device, includes a boom cylinder 331 and a bucket cylinder 332.

[0020] The boom cylinder 331 has one end (rod) attached to the fixed portion 291 and the other end attached to the middle portion 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 attached to the middle portion of the boom 31. The bucket cylinder 332 rotates the bucket 32 ​​up and down by extending and retracting the rod.

[0021] 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.

[0022] <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.

[0023] 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 mission case 243, and a rear mission case 244. The transmission case 24 is a housing that is long in the front-to-rear direction, in which the clutch housing 241, the intermediate frame 242, the front mission case 243, and the rear mission case 244 are assembled with fasteners such as bolts.

[0024] 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.

[0025] 2A and 2B, the operating lever 41 is disposed on the right side of the driver's seat 27. The operating lever 41 also protrudes upward from below a mounting surface 271, which is used to mount the driver's seat 27 to the traveling vehicle body 2, on the right side of the driver's seat 27. For this reason, a grip portion 411 that the driver grasps when operating the operating lever 41 is disposed on the right side of the driver's seat 27 so that the driver can grasp it with their arm bent, that is, so that the driver can grasp and operate it without having to extend their arm.

[0026] A speed change lever (not shown) for changing the traveling speed of the vehicle is disposed on the left side of the driver's seat 27.

[0027] As shown in FIG. 3, the tractor 1 (see FIG. 1) includes a control valve unit 50 and a hydraulic coupling portion 60 in addition to the lever device 40 described above.

[0028] <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 viewed from behind and diagonally above. Figure 5 is a rear view showing the control valve unit 50.

[0029] 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 operating the control lever 41, and controls the amount of hydraulic oil supplied to the hydraulic coupling part 60 in accordance with the amount of operation of the control lever 41.

[0030] As shown in Fig. 3, the hydraulic coupling unit 60 drivably couples the hydraulic equipment (hydraulic cylinder) 33 to the traveling vehicle body 2 (see Fig. 1). The hydraulic coupling unit 60 includes a coupler that can supply hydraulic oil to the hydraulic equipment (hydraulic cylinder) 33. A boom cylinder 331 (see Fig. 1) is coupled to the hydraulic coupling unit 60 so as to be able to supply hydraulic oil. In addition, a bucket cylinder 332 (see Fig. 1) is coupled to the hydraulic coupling unit 60 so as to be able to supply hydraulic oil.

[0031] 4 and 5, the control valve unit 50 is disposed below the driver's seat 27 and to the right of the driver's seat 27. As shown in FIGS. 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 is opened to release hydraulic oil in order to prevent the joy valve 51 from becoming overpressurized.

[0032] The block member 53 includes 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.

[0033] 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 attached to the left of the fender 28, which is closer to the inside of the aircraft body than the fender 28.

[0034] <Lever device> Next, the lever device 40 will be described with reference to Figures 6 and 7. Figures 6 and 7 are perspective views showing the lever device 40. Note that Figure 6 shows the lever device 40 as seen from the front and diagonally above. Also, Figure 7 shows the lever device 40 as seen from the rear and diagonally above.

[0035] 6 and 7, the lever device 40 includes the above-described operating lever 41, a link portion 42, a joint portion 43, a bracket member 44, and a locking mechanism 45. The operating lever 41 includes the above-described grip portion 411 (see FIG. 3) and an attachment portion 412.

[0036] Grip portion 411 is a portion that is gripped by the driver when operating the control lever 41, and is provided at the upper end of the main body of control lever 41. Mounting portion 412 is fixed, for example, by welding, to the lower end of the main body of control lever 41. Control lever 41 is attached to link plate 421, which will be described later, by fixing mounting portion 412 to the upper surface of link plate 421 with fasteners such as bolts.

[0037] Moreover, in a plan view of the aircraft, the attachment portion 412 is disposed on the right side of the attachment surface 271 (see FIG. 2A) of the driver's seat 27. Moreover, in the lever device 40, the upper side of the attachment portion 412 is open.

[0038] The operating lever 41 is a joystick lever that can be tilted in radial directions (360° in the same plane) around the mounting part 412 via a joint part 43 (to be described later). Note that the movable range of the operating lever 41 is restricted by a link part 42 (to be described later) to which the operating lever 41 is connected, so that it can actually be tilted forward, backward, left, and right.

[0039] 2A and 2B, the operating lever 41 after assembly has a shape that 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 midway toward the driver's seat 27 (left). Therefore, the grip portion 411 of the operating lever 41 is positioned in a position suitable for the driver seated in the driver's seat 27 to grasp with his or her right hand.

[0040] As shown in FIG. 2A, the operating lever 41 is attached to a link portion 42 (described later) that is connected to the control valve 51 below the mounting surface 271 of the driver's seat 27.

[0041] 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 by a fastener such as a bolt.

[0042] 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 lower surface of the link plate 421. A base end of the spool 422a is connected to the spool connector 4211a so as to be rotatable in the front-rear direction. Furthermore, a base end of the spool 422b is connected to the spool connector 4211b so as to be rotatable in the left-right direction.

[0043] As described above, the spools 422a and 422b have their base ends connected to the spool connectors 4211a and 4211b, respectively, and their tip ends connected to the drive units 511a and 511b of the joy valve 51, respectively.

[0044] Further, the spools 422a and 422b are each provided with an adjuster portion 423. The adjuster portion 423 is a member that enables adjustment of the length of the spools 422a and 422b, and is provided at an intermediate position of the spools 422a and 422b.

[0045] The lock plate 4212 is a plate-shaped member that protrudes downward from the other end of the lower surface of the link plate 421. The lock plate 4212 is a component of a lock mechanism 45 (described later) that locks the operating lever 41, and has a lock hole 4212a formed so that a lock pin 452 (described later) of the lock mechanism 45 can be inserted therein. The lock mechanism 45 will be described later with reference to Figures 8 and 9.

[0046] The joint portion 43 is a universal joint, and as described above, enables tilting operation around the base end (mounting portion 412) of the operating lever 41. The joint portion 43 is provided below the lower surface 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 a bracket member 44, which will be described later. The joint portion 43 is covered with a bellows-shaped cover 432. The inside of the cover 432 is filled with lubricating oil.

[0047] 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 provided below the link plate 421 so as to sandwich the joint portion 43 together with the link plate 421 in the up-down direction. The joint portion 43 is fixed to the upper surface of the rear bracket portion 441. In addition, a lock cylinder 451, a lock pin 452, a lock lever 453, and the like of the lock mechanism 45, which will be described later, are provided on the upper surface of the rear bracket portion 441.

[0048] 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 the 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.

[0049] <Locking mechanism> Next, the locking mechanism 45 will be described with reference to Figures 8 and 9. Figures 8 and 9 are perspective views showing 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.

[0050] As shown in FIGS. 8 and 9, the lock mechanism 45 includes the lock plate 4212, a lock cylinder 451, a lock pin 452, a lock lever 453, a restricting plate 454, and a biasing member 455.

[0051] The lock cylinder 451 is a cylindrical (cylinder)-shaped member, and as described above, is provided on the upper surface of the rear bracket portion 441. A lock pin 452 is housed in the lock cylinder 451. In such a 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.

[0052] The lock pin 452 is provided so as to be movable forward and backward in an opening at one end of the lock cylinder 451. The lock pin 452 that has advanced from the lock cylinder 451 is inserted into a lock hole 4212a of the lock plate 4212.

[0053] Lock lever 453 is an operating tool for operating lock mechanism 45, and is connected to lock pin 452 housed in lock cylinder 451 at the other end opening of lock cylinder 451. Therefore, when a driver or the like operates lock lever 453 to the right, lock pin 452 advances, and when the driver or the like operates lock lever 453 to the left, the advanced lock pin 452 retracts.

[0054] The restricting plate 454 is a plate-shaped member and 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 moves in the left-right direction.

[0055] The biasing member 455 is a spring (tension coil spring) having 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. That is, the lock pin 452 is maintained in a state where it is inserted into the lock hole 4212a of the lock plate 4212. When the lock lever 453 is operated (moved to the left) against the biasing force of the biasing member 455, the lock by the lock pin 452 is released. Furthermore, the lock lever 453 moves downward along the short side of the L-shaped groove 4541, so that the lock lever 453 is maintained in an unlocked state.

[0056] Lock mechanism 45 is disposed on the inside (right side, which is the inside in the left-right direction of the vehicle) of link plate 421. Lock lever 453 is disposed below driver's seat 27, as shown in Fig. 2A.

[0057] According to the embodiment described above, the operating lever 41 is disposed to the side of the driver's seat 27 and protrudes upward on the right side of the driver's seat 27, so that the driver sitting in the driver's seat 27 can 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 provided in a narrow space beside the driver's seat 27.

[0058] Furthermore, the mounting portion 412 of the operating lever 41 is located on the right side of the mounting surface 271 of the driver's seat 27, and the upper part of the mounting portion 412 of the operating lever 41 is open, so that the mounting portion 412 of the operating lever 41 can be accessed from above. This makes it easy to attach and detach the operating lever 41 and related parts, and also makes it easy to make adjustments after assembly.

[0059] Furthermore, by attaching the joy valve 51 to the transmission case 24 via the block member 53 and attaching the link plate 421 to the bracket member 44 that is fixed to the transmission case 24, the entire operating system from the joy 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 easy.

[0060] 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.

[0061] 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.

[0062] 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 implement 3, but this is not limited to this, and the hydraulic equipment used other than the work implement 3 may also be the object to be operated.

[0063] The above-described embodiment realizes the following work vehicle 1.

[0064] (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 connection part 60 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 part 60, and an operating lever 41 for operating the control valve 51, wherein the operating lever 41 is arranged 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 at the side of the driver's seat 27.

[0065] According to this type of work vehicle 1, the operating lever 41 is disposed 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 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 provided in a narrow space to the side of the driver's seat 27.

[0066] (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 positioned to the side of the mounting surface 271 when viewed from above, and is open at the top.

[0067] According to such a work vehicle 1, in addition to the effect (1) above, the mounting portion 412 of the operating lever 41 is disposed 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, so that the mounting portion 412 of the operating lever 41 can be accessed from above. This makes it easy to attach and detach the operating lever 41 and related parts, and also makes it easy to make adjustments after assembly.

[0068] (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 to a bracket member 44 fixed to the transmission case 24 via a joint portion 43.

[0069] In addition to the effect of (2) above, with this work vehicle 1, 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 easy.

[0070] (4) In the above (3), the work vehicle 1 is provided with a lock mechanism 45 that locks the operating lever 41 and a lock lever 453 for operating the lock mechanism 45, the lock mechanism 45 is arranged inward of the link plate 421, and the operating lever 41 is locked by inserting a lock pin 452 into a lock plate 4212 that extends downward from the underside of the link plate 421, and the lock lever 453 is arranged below the driver's seat 27.

[0071] In addition to the effect of (3) above, such a work vehicle 1 allows the operating lever 41 to be locked by operating the lock lever 453 located below the driver's seat 27 when operation of the operating lever 41 is not required.

[0072] Further advantages and modifications will 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. [Explanation of symbols]

[0073] 1. Work vehicle (tractor) 2 Running vehicle 24 Transmission case 27 Driver's seat 271 Mounting surface 33 Hydraulic equipment (hydraulic cylinders) 41 Operating lever 412 Mounting part 42 Link section 421 Link plate 4212 Lock Plate 43 Joint 44 Bracket member 45 Locking mechanism 452 Lock pin 453 Lock lever 51 Control valve (Joy Valve) 52 Relief valve 53 Block member 60 Hydraulic connection

Claims

1. 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; Equipped with 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 plan 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 link plate is attached to a bracket member fixed to the transmission case via a joint portion. A work vehicle characterized by:

2. a locking mechanism that locks the operating lever; a lock lever for operating the lock mechanism; Equipped with 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 lock lever is disposed below the driver's seat. The work vehicle according to claim 1 .

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