Work vehicle

Abstract

To provide a work vehicle having a relatively small number of members and allowing free and easy selection of the layout.SOLUTION: The work vehicle includes an engine, wheels to be driven with power given from the engine, a transmission case 7 for transmitting the power of the engine to the wheels, a changeover operation tool 14 for accepting the manipulation to change over the power transmission state of the transmission case 7, a changeover mechanism 30 to be actuated to change over the power transmission state of the transmission case 7, and a plurality of wires to be pulled to the changeover operation tool 14 side with the manipulation of the changeover operation tool 14. The plurality of wires are connected to the changeover operation tool 14 and arm parts 31, 32 of the changeover mechanism 30. The changeover mechanism 30 is actuated with the arm parts 31, 32 pulled by the wires.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] The work vehicle described in Patent Document 1 (referred to as a "traveling vehicle" in Patent Document 1) is equipped with a drive source (referred to as an "engine" in Patent Document 1), a traveling device driven by the drive source, a power transmission device (referred to as a "forward / reverse switching device" in Patent Document 1) that transmits power to the traveling device, and a switching device (referred to as a "shuttle lever" in Patent Document 1) that accepts manual operation to switch the power transmission state of the power transmission device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2019-219021 Summary of the Invention [Problem to be solved by the invention]

[0004] The work vehicle described in Patent Document 1 is a traveling vehicle equipped with a mechanical forward / reverse switching device, which allows for increased foot space for the driver.

[0005] However, in the work vehicle described in Patent Document 1, the components from the switching operation tool to the power transmission device are composed of rod-shaped components. As a result, the number of components tends to increase due to the need to fix each component, etc. Also, the degree of freedom in the layout of each component tends to be reduced.

[0006] An object of the present invention is to provide a work vehicle that has a relatively small number of parts and whose layout can be easily selected freely. [Means for solving the problem]

[0007] The present invention is characterized in that it comprises a drive source, a traveling device driven by power from the drive source, a power transmission device that transmits the power of the drive source to the traveling device, a switching operation device that accepts manual operation to switch the power transmission state of the power transmission device, a switching mechanism that switches the power transmission state of the power transmission device when activated, and a plurality of wires that are pulled toward the switching operation device by manual operation of the switching operation device, wherein the plurality of wires are connected to the switching operation device and an arm portion in the switching mechanism, and the switching mechanism is activated when the arm portion is pulled by the wires.

[0008] According to this configuration, the power transmission state of the power transmission device is switched by a plurality of wires connecting the switching operation tool and the switching mechanism. This reduces the number of components required compared to when using rod-shaped components. Furthermore, compared to rod-shaped components, the layout is more flexible. Furthermore, by connecting the plurality of wires to the switching mechanism, the plurality of wires can switch the switching mechanism in a plurality of directions. In other words, the plurality of wires can reversibly switch the switching mechanism.

[0009] In other words, this configuration makes it possible to realize a work vehicle that has a relatively small number of components and whose layout can be easily selected freely.

[0010] In the present invention, a steering mechanism for manual steering is provided, the switching operation device is supported by the steering mechanism, the position of the steering mechanism can be adjusted by swinging in the fore-and-aft direction of the aircraft, and it is preferable that the switching operation device swings to follow the steering mechanism when the position of the steering mechanism is adjusted.

[0011] If the steering mechanism does not swing back and forth, some workers may find it difficult to operate the steering mechanism because they are too close or too far away. Also, if the steering mechanism swings back and forth but the switching mechanism does not swing, swinging the steering mechanism will increase the distance between the steering mechanism and the switching mechanism, making it inconvenient for the worker to operate.

[0012] With this configuration, the steering mechanism and the switching operation tool that follows the steering mechanism can swing back and forth and their positions can be adjusted, so that the optimum position can be set for the worker as needed, allowing the worker to work comfortably.

[0013] Furthermore, in the present invention, the plurality of wires are a first wire and a second wire, and the arm portion and the switching operation device are both rotatable and configured to be linked to each other via the first wire and the second wire, and it is preferable that when the switching operation device is rotated by manual operation, one of the first wire and the second wire is pulled toward the switching operation device, and the other wire is pulled toward the switching mechanism by the rotation of the arm portion.

[0014] Wires are characterized by being weak against compressive loads but strong against tensile loads.

[0015] According to this configuration, by connecting two wires to the switching mechanism, it is possible to rotate the switching mechanism by applying a tensile load to either the first wire or the second wire, which means that the arm can be rotated without applying a compressive load to the wires.

[0016] Furthermore, in the present invention, it is preferable that the first wire and the second wire each have a string-like portion and an expansion portion located at the end on the switching operating device side and having a larger diameter than the string-like portion, the switching operating device has a first connection portion to which the first wire is connected and a second connection portion to which the second wire is connected, the first connection portion and the second connection portion have insertion holes through which the expansion portion cannot pass but the string-like portion can pass, and the string-like portion is inserted into the insertion holes.

[0017] According to this configuration, the expansion portion of the wire cannot pass through the insertion hole in the first and second connection portions of the switching operation device. Therefore, when an operating force of the switching operation device is applied to the wire, the operating force is reliably transmitted to the arm portion via the expansion portion. Furthermore, in the other connection portion, the expansion portion moves in a direction away from the insertion hole. This prevents the wire from bending and breakage. Therefore, with this configuration, the operating force of the switching operation device can be reliably transmitted to the arm portion and breakage of the wire can be prevented.

[0018] In the present invention, the farm equipment is provided with a working unit that works in a field and a lifting execution unit that is activated by contact with the arm unit, the working unit is configured to rise in response to the operation of the lifting execution unit, the lifting execution unit is positioned in a position where the arm unit can contact it by rotating, and the lifting execution unit is preferably positioned so that the arm unit contacts the lifting execution unit when the power transmission state of the power transmission device is switched to reverse.

[0019] It is desirable for the switch to reverse and the operation of the ascent execution unit to occur simultaneously. However, the wire may stretch due to deterioration over time. As a result, the wire may not be pulled sufficiently in response to the operation of the switching operation device. Therefore, in a configuration in which the ascent execution unit is located on the switching operation device side, the timing between the switch to reverse and the operation of the ascent execution unit will be out of sync.

[0020] According to this configuration, the ascent execution unit is located on the arm unit side. Furthermore, the rotation of the arm unit activates the ascent execution unit and switches to reverse. Therefore, if the wire elongates due to deterioration over time, it is possible to simultaneously activate the ascent execution unit and switch to reverse by pulling the wire more. Therefore, with this configuration, the ascent execution unit can be activated and the switch to reverse can be simultaneously performed without being affected by the elongation of the wire due to deterioration over time. [Brief explanation of the drawings]

[0021] [Figure 1]FIG. [Figure 2] FIG. 2 is a left side view showing the configuration of the steering mechanism. [Figure 3] FIG. [Figure 4] FIG. 2 is a rear view showing the configuration of the shuttle lever and the like. [Figure 5] FIG. 2 is a plan view showing the configuration of the shuttle lever and the like. [Figure 6] FIG. 4 is a left side view showing the configuration of the switching mechanism. [Figure 7] FIG. 4 is a rear view showing the configuration of the switching mechanism. [Figure 8] FIG. 2 is a side view showing the configuration of a rotating body. [Figure 9] FIG. 2 is a front view showing the configuration of a rotating body. [Figure 10] FIG. 4 is a schematic diagram showing the link between a rotating body and a switching mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0022] An embodiment of the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the direction of arrow F in the drawings will be referred to as "forward," the direction of arrow B as "rear," the direction of arrow L as "left," and the direction of arrow R as "right." Furthermore, the direction of arrow U will be referred to as "up," and the direction of arrow D as "down." Furthermore, unless otherwise specified, it is assumed that the aircraft is steered so as to fly straight ahead.

[0023] [Overall configuration of the tractor] As shown in Figures 1 and 2, in a tractor (corresponding to the "work vehicle" according to the present invention), left and right front wheels 1 (corresponding to the "traveling device" according to the present invention) are provided at the front of the machine body. Left and right rear wheels 2 (corresponding to the "traveling device" according to the present invention) are provided at the rear of the machine body. The machine body is supported by the front wheels 1 and rear wheels 2. A hood 5 is provided at the front of the machine body, and a driver's seat 4 is provided in the center of the machine body, with an engine 6 (corresponding to the "drive source" according to the present invention) located inside the hood 5. Furthermore, a transmission case 7 (corresponding to the "power transmission device" according to the present invention) that transmits power from the engine 6 to the front wheels 1 or rear wheels 2 is provided below the driver's seat 4.

[0024] The tractor also includes a switching operation device 14 located on the front left side of the driver's seat 4, which accepts manual operation to switch the power transmission state of the transmission case 7, and a steering mechanism 50 for manual steering in front of the driver's seat 4. The tractor also includes a working unit 3 at the rear of the vehicle body that works in the field.

[0025] [Steering mechanism configuration] Next, the steering mechanism 50 will be described with reference to Figures 2 and 4. The steering mechanism 50 has a steering wheel 51 that rotates to steer the vehicle, a steering shaft 52 that supports the steering wheel 51 and rotates integrally therewith, a shaft cover body 53 that extends in the direction of extension of the steering shaft 52 and is provided so as to cover the steering shaft 52, and a gate-shaped steering support mechanism 55.

[0026] The steering wheel 51 rotates integrally with the steering shaft 52 around the X axis, which is the same axis as the steering shaft 52.

[0027] The lower end of the steering shaft 52 is connected to the upper end of the power steering 8, which is supported on the vehicle body and assists steering operations. The lower end of the steering shaft 52 is bifurcated in a front view, with a connecting shaft 52a extending in the left-right direction of the vehicle body. The upper end of the power steering 8 is bifurcated in a side view, with a connecting shaft 8a extending in the front-rear direction of the vehicle body. The connecting shaft 52a and connecting shaft 8a are connected, and the steering shaft 52 is provided to be swingable around a Y-axis that is coaxial with the connecting shaft 52a.

[0028] In addition, the shaft cover body 53 has a support piece 53a on the upper part, which supports the shuttle lever 10. When the steering mechanism 50 swings in the fore-and-aft direction of the aircraft about the Y axis for position adjustment, the shuttle lever 10 swings to follow the steering mechanism 50.

[0029] The gate-shaped steering support mechanism 55 is composed of a first support member 55a with an open front when viewed from above the vehicle, and a gate-shaped second support member 55b when viewed from the front of the vehicle. The first support member 55a is supported by the vehicle, and the power steering 8 is located inside it. The second support member 55b is configured to be swingable relative to the first support member 55a around the Y axis. A hole is formed in the top surface of the second support member 55b, and the shaft cover body 53 and the steering shaft 52 are inserted into the hole. As a result, when the steering mechanism 50 swings in the fore-and-aft direction of the vehicle around the Y axis, the second support member 55b swings integrally with the steering mechanism 50.

[0030] [About the tilt lock mechanism] The lock mechanism 56 for the forward and backward swing of the steering mechanism 50 will be described using Figures 2, 4, and 5. The first support member 55a has a lock mechanism 56 at the upper end of the left side surface. The lock mechanism 56 is made up of a lock lever 57, a lever fixing portion 58, and a lock biasing mechanism 59.

[0031] The lock lever 57 is bent at a substantially right angle and is located below the shuttle lever 10. The lock lever 57 is configured to be swingable in the up and down direction around a front-to-rear axis.

[0032] The lever fixing portion 58 is supported by the first support member 55a. In a side view, the lever fixing portion 58 is provided at a position overlapping the first support member 55a and the second support member 55b, and supports the lock lever 57 and restricts the range of swing of the lock lever 57. The lever fixing portion 58 also has a bolt V2 in its center.

[0033] The lock biasing mechanism 59 is supported by the bolt V2 and is provided across the lever fixing portion 58 and the lock lever 57. The lock biasing mechanism 59 biases the lock lever 57 in the left direction. Because the lock lever 57 is inserted into a cover body (not shown) that has an insertion hole that slopes downward to the left, the biasing force in the left direction acts on the lock lever 57 as a downward biasing force.

[0034] The second support member 55b has a lock space S on its left side surface. The lock space S is a hole (cutout) formed in the second support member 55b. The second support member 55b has a plurality of protrusions T extending downward from the upper end of the lock space S.

[0035] The lock lever 57 is inserted into the lock space S and can be locked by the protrusion T. The lock lever 57 can be disengaged from the protrusion T by swinging up and down.

[0036] With this configuration, the locking mechanism 56 restricts the swinging of the steering mechanism 50 in the front-rear direction.

[0037] In other words, by swinging the lock lever 57 upward and disengaging the end of the lock lever 57 from the projection T, the steering mechanism 50 becomes swingable in the front-rear direction.

[0038] [About the switching device] The switching operation device 14 is composed of a shuttle lever 10 and a rotating body 20, which will be described later.

[0039] [Shuttle lever configuration] The configuration of shuttle lever 10 will be described using Figures 4 and 5. Shuttle lever 10 has a grip portion 11 that is gripped by the operator's hand, a lever portion 12 that extends from grip portion 11, a lever support member 13 that supports lever portion 12, and a biasing mechanism 26 that biases lever portion 12 downward in the vertical direction, and shuttle lever 10 is configured to be swingable in the fore-and-aft direction of the machine body around a Z-axis that is parallel to the X-axis.

[0040] Lever portion 12 has an attachment portion 12a and a deformation portion 12b below attachment portion 12a. Furthermore, lever portion 12 is supported by lever support member 13 and is configured to be rotatable integrally with lever support member 13. Deformation portion 12b is thinner than lever portion 12 in side view and has a substantially rectangular shape. Deformation portion 12b slides against the side surface of lever support member 13.

[0041] Lever support member 13 is supported by support piece 53a of shaft cover body 53. Lever support member 13 also has recess 13a in plan view. When deformed portion 12b slides relative to lever support member 13, deformed portion 12b fits into recess 13a, preventing lever portion 12 from swinging.

[0042] The mounting portion 12a extends toward the upper side of the aircraft body and is configured in a U-shape in a plan view.

[0043] Furthermore, lever portion 12 and mounting portion 12a are configured to be able to swing integrally in the up-down direction of the machine body around bolt V1 (described later) as an axis. When shuttle lever 10 swings upward, deformation portion 12b swings in a direction away from lever support member 13. When deformation portion 12b moves away from lever support member 13, deformation portion 12b comes out of recess 13a in lever support member 13.

[0044] Therefore, by swinging the shuttle lever 10 toward the upper side of the machine body, it becomes possible to swing the shuttle lever 10 in the forward and backward directions.

[0045] [Configuration of the rotating body] Next, the configuration of the rotating body 20 will be described with reference to Figures 4, 8, and 9. The rotating body 20 is composed of a support shaft portion 25 inserted into the lever support member 13, a first connecting portion 23, and a second connecting portion 24. The rotating body 20 is bolted to the mounting portion 12a with a bolt V1 and is supported by the mounting portion 12a.

[0046] The support shaft 25 is inserted into the lever support member 13 and into the space surrounded by the mounting portion 12a. The support shaft 25 is rotatable relative to the lever support member 13. The rotating body 20 is configured to be able to swing integrally with the shuttle lever 10 as it swings back and forth in a plan view. Furthermore, a biasing mechanism 26 is provided across the bolt V1 and the end of the mounting portion 12a. Therefore, the shuttle lever 10 is biased downward in a front view.

[0047] The support shaft portion 25 has at its lower end a first blade portion 21 and a second blade portion 22. The first blade portion 21 and the second blade portion 22 are arranged at a position that has a predetermined angle therebetween, and a first connecting portion 23 and a second connecting portion 24 are welded to the first blade portion 21 and the second blade portion 22, respectively.

[0048] First connection portion 23 and second connection portion 24 are located below first blade portion 21 and second blade portion 22, respectively, and are connected to first wire 41 and second wire 42, respectively. First connection portion 23 and second connection portion 24 have the same structure, so only first connection portion 23 will be described below. The same is true for first wire 41 and second wire 42, so only first wire 41 will be described below.

[0049] The first connecting portion 23 has a curved plate-like member shape and has long sides 27 and short sides 28. In the first connecting portion 23, the long side 27 is on the support shaft portion 25 side, and the short side 28 is on the outer end side of the arm portion. The first connecting portion 23 also has an inflation insertion hole 23a and a string insertion hole 23b (corresponding to the "insertion hole" according to the present invention). The inflation insertion hole 23a is substantially circular and is located at the outer end of the long side 27. The string insertion hole 23b is in communication with the inflation insertion hole 23a.

[0050] The first wire 41 has a string-like portion 47 and an expansion portion 46 that is located at the end on the switching operation device 14 side and has a larger diameter than the string-like portion 47. The expansion portion 46 can pass through the expansion insertion hole 23a but cannot pass through the string insertion hole 23b. The string-like portion 47 can pass through both the expansion insertion hole 23a and the string insertion hole 23b. In other words, the first connection portion 23 has the expansion insertion hole 23a that can pass both the expansion portion 46 and the string-like portion 47, and the string insertion hole 23b that cannot pass through the expansion portion 46 but can pass through the string-like portion 47.

[0051] In the first connection part 23, the expansion part 46 is located on the support shaft part 25 side, and the string-shaped part 47 is inserted into the string insertion hole 23b. This allows the first wire 41 to be pulled toward the shuttle lever 10 by manually operating the shuttle lever 10.

[0052] The string-like portion 47 of the first wire 41 passes through the first outer wire 41a. The first outer wire 41a extends in the same direction as the first wire 41, and protects the first wire 41.

[0053] [Switching mechanism configuration] Next, the switching mechanism 30 will be described with reference to Figures 6 and 7. The string-like portions 47 of the first wire 41 and the second wire 42 are connected to the switching mechanism 30, which switches the forward and reverse drive of the transmission case 7 when activated.

[0054] The switching mechanism 30 is composed of a first arm portion 31 (corresponding to the "arm portion" according to the present invention) to which the first wire 41 is connected, a second arm portion 32 (corresponding to the "arm portion" according to the present invention) to which the second wire 42 is connected, a cylindrical portion 33 in which the first arm portion 31 and the second arm portion 32 are arranged at a predetermined angle, a connecting shaft 34 that extends to the inside of the transmission case 7, and a guide portion 35 that rotates integrally with the connecting shaft 34.

[0055] The first arm portion 31 extends upward from the cylindrical portion 33. The first arm portion 31 also has a wire locking portion 36 at its upper end, where an end of a first wire 41 is locked.

[0056] The second arm portion 32 extends downward from the cylindrical portion 33. The second arm portion 32 has a wire locking portion 36 at its lower end, and an end of a second wire 42 is locked thereto.

[0057] The second arm portion 32 has a contact portion 32a, which is formed by bending a plate-like member, at its lower end on the side facing the transmission case 7. The contact portion 32a has a shape that is curved at a substantially right angle when viewed from the left and right of the vehicle body, and has a long side 38 and a short side 39. The short side 39 is supported by the second arm portion 32.

[0058] The tractor also includes a support plate 9 that is supported on the machine body and is arranged near the transmission case 7. The support plate 9 is composed of a wire support portion 9a and a lift support portion 9b. The wire support portion 9a is located on the outer side of the machine body relative to the lift support portion 9b. The wire support portion 9a has grooves that engage the first outer wire 41a and the second outer wire 42a. Therefore, the ends of the first outer wire 41a and the second outer wire 42a on the transmission case 7 side are supported on the machine body via the wire support portion 9a. The lift execution portion 60, which will be described later, is inserted into the lift support portion 9b. Therefore, the lift support portion 9b supports the lift execution portion 60.

[0059] The first outer wire 41a and the second outer wire 42a are fixed in position on both sides with respect to the support plate 9 by nuts N1 and N2. In other words, the nuts N1 and N2 sandwich the support plate 9. Depending on how tightly the nuts N1 and N2 are fastened, the apparent lengths of the first outer wire 41a and the second outer wire 42a change by the amount of change in the distance between the nuts N1 and N2. In other words, the layout of the first outer wire 41a and the second outer wire 42a changes, and therefore the positions of the first wire 41 and the second wire 42 change.

[0060] Therefore, it is preferable that the first outer wire 41a and the second outer wire 42a are not elastic and easy to route, but are hard and difficult to route.

[0061] The connecting shaft is inserted into the cylindrical portion 33 and rotates integrally with the cylindrical portion 33 at an axis P along the connecting shaft , and the guide portion rotates integrally with the connecting shaft .

[0062] The upper end of the guide portion 35 is connected to a fork rod 37 that switches between forward and reverse drive in the transmission case 7. The fork rod 37 extends in the fore-and-aft direction of the vehicle, and by moving it in the fore-and-aft direction, it switches the power transmission state of the transmission case 7 between forward, neutral, and reverse drive. In other words, when the guide portion 35 rotates, the fork rod 37 moves in the fore-and-aft direction of the vehicle. This switches the forward and reverse drive of the transmission case 7. When the power transmission state of the transmission case 7 is neutral, the deformation portion 12b of the shuttle lever 10 fits into the recess 13a of the lever support portion, and the swinging of the shuttle lever 10 in the fore-and-aft direction is restricted.

[0063] Therefore, the switching mechanism 30 rotates when pulled by the first wire 41 or the second wire 42, and the transmission case 7 can be switched between forward and reverse.

[0064] The fork rod 37 is located at the rear in the longitudinal direction of the vehicle body, and has a detent mechanism (not shown) for determining the position to which the fork rod 37 can be moved.

[0065] [Explanation of the Ascending Execution Department] The lifting execution unit 60 will be described using Figures 6 and 7. The tractor has a working unit 3 provided at the rear of the machine body, and a working arm unit 61 that supports the working unit 3. The working unit 3 is configured so that the working arm unit 61 is controlled and lifted in response to the operation of the lifting execution unit 60, which will be described later. For example, the lifting execution unit 60 is a contact switch, and when this contact switch is operated, the actuator of the working arm unit 61 is activated, causing the working unit 3 to lift. The linkage between the lifting execution unit 60 and the working arm unit 61 may be achieved by the linkage of mechanical members.

[0066] The rise execution unit 60 is supported by the rise support unit 9b below the driver's seat 4, and is disposed in a position where it can come into contact with the contact portion 32a of the second arm unit 32 of the switching mechanism 30. In other words, the rise execution unit 60 is activated by the rotation of the second arm unit 32. Furthermore, when the switching mechanism 30 is switched to reverse, the rise execution unit 60 is activated by coming into contact with the contact portion 32a.

[0067] [Explanation of the connection between the rotating body and the switching mechanism] Next, the link between the rotating body 20 and the switching mechanism 30 will be described with reference to Fig. 10. Fig. 10 is a schematic diagram.

[0068] 10 is a bottom view of the rotating body 20. In this configuration, the first wire 41 is provided between the first connecting portion 23 and the first arm portion 31, and the second wire 42 is provided between the second connecting portion 24 and the second arm portion 32. The first wire 41 and the second wire 42 are connected to the first connecting portion 23 and the second connecting portion 24, respectively, by an expanding portion 46. Furthermore, the other ends of the first wire 41 and the second wire 42 are locked by the wire locking portions 36 of the first arm portion 31 and the second arm portion 32.

[0069] As shown in Figure 10, when the power transmission state of the transmission case 7 is forward, neutral, or reverse, the positions of the first blade portion 21 of the rotating body 20 and the first arm portion 31 of the switching mechanism 30 are position E1, position E2, and position E3.

[0070] When the shuttle lever 10 is operated from neutral to forward, the rotating body 20 rotates counterclockwise in FIG. 10. The first blade portion 21 of the rotating body 20 moves from position E2 to position E1. The first blade portion 21 pulls the first wire 41 to the left in FIG. 10. The first wire 41 pulls the first arm portion 31 of the switching mechanism 30 to the left in FIG. 10, and the first arm portion 31 moves from position E2 to position E1. Through the above operation, the transmission state of the transmission case 7 switches from neutral to forward. Note that when the rotating body 20 starts to rotate counterclockwise by operating the shuttle lever 10, the expansion portion 46 on the second wire 42 side momentarily separates from the second connection portion 24, and the tension in the second wire 42 is reduced. However, immediately after that, the second arm portion 32 rotates, pulling the second wire 42 to the right in Figure 10, causing the expansion portion 46 on the second wire 42 side to abut against the second connection portion 24, and the tension in the second wire 42 is restored.

[0071] When the shuttle lever 10 is operated from neutral to reverse, the rotating body 20 rotates clockwise in FIG. 10. The first blade portion 21 of the rotating body 20 moves from position E2 to position E3. The second blade portion 22 pulls the second wire 42 to the left in FIG. 10. The second wire 42 pulls the second arm portion 32 of the switching mechanism 30 to the left in FIG. 10, causing the first arm portion 31 to move from position E2 to position E3. Through the above operations, the transmission state of the transmission case 7 switches from neutral to reverse. Note that when the rotating body 20 starts to rotate clockwise by operating the shuttle lever 10, the expansion portion 46 on the first wire 41 side momentarily separates from the first connection portion 23, and the tension in the first wire 41 is reduced. However, immediately after that, the first arm portion 31 rotates, pulling the first wire 41 to the right in Figure 10, causing the expansion portion 46 on the first wire 41 side to abut against the first connection portion 23, and the tension in the first wire 41 is restored.

[0072] When the vehicle is shifted from neutral to reverse, the above-mentioned linkage rotates clockwise. When the shuttle lever 10 is shifted to reverse and the first arm 31 moves to position E3, the second arm 32 comes into contact with the lifting execution unit 60, causing the working unit 3 to lift.

[0073] Other Embodiments (1) The steering wheel 51 does not need to swing in the fore-and-aft direction of the aircraft body.

[0074] (2) The first wire 41 and the second wire 42 do not necessarily have to have the expansion portion 46 .

[0075] (3) The lifting execution unit 60 does not have to be disposed on the transmission case 7 side.

[0076] (4) The shuttle lever 10 may be operated by pulling the lever portion 12 in a direction along the lever portion 12 .

[0077] (5) The location of the shuttle lever 10 is not limited to the front left side of the driver's seat 4, but may be any location that allows the operator to operate it.

[0078] (6) The "switching operation tool" according to the present invention is not limited to the shuttle lever 10. Any operation tool other than the shuttle lever 10 may be provided as the "operation tool" according to the present invention, and the operation target of the operation tool may be any part other than the fork rod 37.

[0079] The configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments, unless a contradiction arises. Furthermore, the embodiments disclosed in this specification are merely examples, and the present invention is not limited to these, and can be modified as appropriate within the scope of the present invention. [Industrial Applicability]

[0080] The present invention can be applied not only to work vehicles with front wheels 1 and rear wheels 2, but also to work vehicles with front wheels 1 and rear crawler running devices (equivalent to running devices), and also to work vehicles that do not have front wheels 1 and rear wheels 2 but have right and left crawler running devices. [Explanation of symbols]

[0081] 1: Front wheel (running gear) 2: Rear wheel (running gear) 3: Working section 6: Engine (power source) 7: Transmission case (power transmission device) 14: Switching operation tool 23: First connection part 23b: String insertion hole (insertion hole) 24: Second connection part 30: Switching mechanism 31: First arm section (arm section) 32: Second arm section (arm section) 41: First wire 42: Second wire 46: String-like part 47: Expansion section 50: Steering mechanism 60: Rising Execution Department

Claims

1. A driving source; a traveling device driven by power from the drive source; a power transmission device that transmits power from the drive source to the traveling device; a switching operation tool that accepts manual operation for switching the power transmission state of the power transmission device, a switching mechanism that switches the power transmission state of the power transmission device by operating; a plurality of wires that are pulled toward the switching operation tool by manual operation of the switching operation tool, the plurality of wires are connected to the switching operation tool and an arm portion of the switching mechanism, The switching mechanism is a work vehicle that is operated when the arm portion is pulled by the wire.

2. Equipped with a steering mechanism for manual steering, the switching operation tool is supported by the steering mechanism, the steering mechanism is positionally adjustable by swinging in the fore-and-aft direction of the aircraft; The work vehicle according to claim 1, wherein the switching operation device swings to follow the steering mechanism when the steering mechanism is adjusted in position.

3. the plurality of wires are first wires and second wires, the arm portion and the switching operation tool are both rotatable and configured to move in conjunction with each other via the first wire and the second wire, A work vehicle as described in claim 1, wherein when the switching operating device is rotated by manual operation, one of the first wire and the second wire is pulled toward the switching operating device, and the other wire is pulled toward the switching mechanism by rotating the arm portion.

4. each of the first wire and the second wire has a string-like portion and an expanding portion located at an end on the switching operation tool side and having a diameter larger than that of the string-like portion; the switching operation tool has a first connection portion to which the first wire is connected and a second connection portion to which the second wire is connected, the first connecting portion and the second connecting portion have insertion holes through which the inflatable portion cannot pass but through which the string-like portion can pass, The work vehicle according to claim 3 , wherein the string-like portion is inserted into the insertion hole.

5. a working unit that works in a field; a lifting execution unit that is actuated by contact with the arm unit, The working unit is configured to rise in response to the actuation of the lifting execution unit, the lifting execution unit is disposed at a position where the arm unit can come into contact with the lifting execution unit by rotating the arm unit, 5. The work vehicle according to claim 3, wherein the lifting execution unit is disposed so that the arm unit abuts against the lifting execution unit when the power transmission state of the power transmission device is switched to reverse.

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