Operation mechanism and work vehicle

Abstract

To provide an operation mechanism and a work vehicle which can eliminate an unintentionally oscillating operation of an operation tool, and which is excellent in operability and has a relatively simple structure.SOLUTION: A first retention mechanism K1 of an operation mechanism can hold an operation tool 13 at a second operation position through engaging a first engagement part 31 and a second engagement part 32 with each other, and can release the engagement of the first engagement part 31 and the second engagement part 32 by a second oscillating operation. An elastic member 26 is arranged, when seen in the direction along elastic force applied from the elastic member 26 to a holding part 24, at an opposite side of the first engagement part 31 relative to a second shaft core P2. The elastic force is applied to rotate the operation tool 13 around the second shaft core P2, and the elastic force is applied, when the operation tool 13 is positioned at the second operation position, in a direction so that the first engagement part 31 is to be in close proximity to the second engagement part 32.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an operating mechanism and a work vehicle. [Background technology]

[0002] An operating mechanism for operating a work vehicle is already known, for example, as described in Patent Document 1. This operating mechanism (referred to as a "lever operating device" in Patent Document 1) is equipped with an operating tool (referred to as a "forward / reverse speed change lever" in Patent Document 1).

[0003] This operating tool is configured to be swingable in the forward and backward directions and in the up and down directions, and by swinging this operating tool in the forward and backward directions between a forward operating position, a neutral operating position, and a reverse operating position, the forward and backward traveling state of the work vehicle can be switched.

[0004] The operating mechanism also includes a guide member and a pressing body that protrudes toward the guide member to prevent the operating tool from being unintentionally swung from the neutral operating position to the forward operating position or the reverse operating position. The pressing body is pressed against the guide member by a coil spring.

[0005] The guide member has a barrier portion and a cam surface. When the operating tool is in the neutral operating position, the barrier portion restricts the forward and backward swing of the pressing body. This restricts the forward and backward swing of the operating tool.

[0006] Furthermore, when the operating tool is swung upward while it is in the neutral operating position, the pressing body is guided by the cam surface, thereby reducing the protruding length of the pressing body. As a result, the forward and backward swing of the pressing body is no longer restricted by the barrier portion. This makes it possible to swing the operating tool from the neutral operating position to the forward operating position or the reverse operating position. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 5603814 Summary of the Invention [Problem to be solved by the invention]

[0008] The guide member in the operating mechanism described in Patent Document 1 has a barrier portion and a cam surface. The cost of manufacturing a guide member with such a complex structure tends to be relatively high. As a result, the manufacturing cost of the operating mechanism tends to be relatively high.

[0009] An object of the present invention is to provide an operating mechanism and a work vehicle that can prevent the operating tool from being unintentionally swung, has good operability, and has a relatively simple configuration. [Means for solving the problem]

[0010] A feature of the operating mechanism according to the present invention is that the operating mechanism for operating a work vehicle comprises an operating tool and a support member for supporting the operating tool, the operating tool being configured to be capable of a first swinging operation which is a swinging operation about a first axis and a second swinging operation which is a swinging operation about a second axis in a direction intersecting the first axis, the operating tool being capable of changing its position between a first operating position and a second operating position by the first swinging operation, and the work vehicle being operable by the first swinging operation, and comprising a first holding mechanism and a second holding mechanism capable of holding the position of the operating tool. the first holding mechanism has a first engagement portion connected to the operating tool and a second engagement portion provided on the support member and engageable with the first engagement portion, the second engagement portion being provided at a position corresponding to the position of the first engagement portion when the operating tool is located at the second operating position, and the first holding mechanism is configured such that the first engagement portion and the second engagement portion are engaged with each other to hold the operating tool at the second operating position, and the engagement between the first engagement portion and the second engagement portion can be released by the second swing operation. The second holding mechanism has a first fitted portion provided on the support member, a fitting portion that can fit into the first fitted portion, a holding portion that is connected to the operating tool and holds the fitting portion, and an elastic member that is provided across the holding portion and the fitting portion and presses the fitting portion toward the support member, and when the first swing operation is performed, the fitting portion swings around the first axis center integrally with the operating tool and the holding portion while being held by the holding portion, and when the operating tool is located at the first operating position, the first fitted portion the second retaining mechanism is provided at a position corresponding to the position of the engaging portion of the second retaining mechanism, and the engaging portion is engaged with the first engaged portion to retain the operating tool at the first operating position; when viewed from the direction of the elastic force acting on the retaining portion from the elastic member, the elastic member is positioned on the opposite side of the second axis from the first engaging portion; the elastic force acts in a direction to rotate the operating tool around the second axis, and when the operating tool is positioned at the second operating position, acts in a direction to move the first engaging portion closer to the second engaging portion.

[0011] According to this configuration, when the operating tool is located at the second operating position, the first engagement portion is pressed against the second engagement portion by the elastic force of the elastic member. This allows the operating tool to be stably held at the second operating position by the first holding mechanism. As a result, it is possible to prevent the first swing operation from being performed unintentionally.

[0012] Furthermore, with this configuration, when the operating tool reaches the first operating position, the fitting portion fits into the first fitted portion. This makes the pivoting operation to the first operating position accompanied by a clicking sensation. As a result, the operability of the operating tool is improved.

[0013] Furthermore, with this configuration, the engagement between the first engagement portion and the second engagement portion can be released by performing the second swing operation against the elastic force of the elastic member. This enables the first swing operation of the operating tool. Furthermore, with this configuration, it is not necessary to provide a guide member having a cam surface that guides the members (the fitting portion and the holding portion) pushed by the elastic member.

[0014] That is, according to this configuration, it is possible to prevent the operating tool from being unintentionally swung, and it is possible to realize an operating mechanism that is easy to operate and has a relatively simple configuration.

[0015] Furthermore, in the present invention, it is preferable that the second holding mechanism has a second engaging portion provided on the support member, the second engaging portion is provided at a position corresponding to the position of the engaging portion when the operating tool is located at the second operating position, and the second holding mechanism is capable of holding the operating tool at the second operating position by engaging the engaging portion with the second engaging portion.

[0016] According to this configuration, when the operating tool reaches the second operating position, the fitting portion fits into the second fitted portion. This makes the pivoting operation to the second operating position accompanied by a clicking sensation. As a result, the operability of the operating tool is improved.

[0017] Furthermore, in the present invention, it is preferable that the first axis is aligned along the up-down direction of the body of the work vehicle, and the second axis is aligned along the fore-and-aft direction of the body.

[0018] According to this configuration, the operator can easily distinguish and recognize the direction of the first swing operation and the direction of the second swing operation, thereby improving the operability of the operating tool.

[0019] Furthermore, in the present invention, it is preferable that the elastic force acts in a direction that swings the operating tool downward in the vertical direction of the body, and when the first engagement portion and the second engagement portion are engaged with each other, the operating tool is lifted against the elastic force, thereby releasing the engagement between the first engagement portion and the second engagement portion.

[0020] This configuration makes it easier to prevent an operator from unintentionally disengaging the first engagement portion from the second engagement portion, compared to a configuration in which the engagement between the first engagement portion and the second engagement portion is released by pushing down the operating tool. Therefore, this configuration makes it easier to prevent erroneous operation of the operating tool.

[0021] Furthermore, in the present invention, it is preferable that the operating tool can be changed to a third operating position by the first swinging operation, and that the first swinging operation can switch between forward and reverse travel of the work vehicle, the second operating position is located between the first operating position and the third operating position, the first operating position corresponds to a forward state in which the work vehicle moves forward, the second operating position corresponds to a neutral state in which the work vehicle is stopped, and the third operating position corresponds to a reverse state in which the work vehicle moves backward, the second engagement portion has a regulating portion that regulates the first swinging operation from the second operating position to the first operating position and the first swinging operation from the second operating position to the third operating position, and the regulating portion is configured not to regulate the first swinging operation from the first operating position to the second operating position and the first swinging operation from the third operating position to the second operating position, and is configured not to regulate the first swinging operation when the engagement between the first engagement portion and the second engagement portion is released by the second swinging operation.

[0022] According to this configuration, the restricting unit restricts operation from the neutral state to the forward state or the reverse state, which makes it easier to prevent the operator from unintentionally switching to the forward state or the reverse state.

[0023] The work vehicle according to the present invention is characterized by being provided with the above-described operating mechanism.

[0024] This configuration makes it possible to prevent the operating tool from being unintentionally swung, and to realize a work vehicle that is easy to operate and has a relatively simple configuration.

[0025] Furthermore, in the present invention, it is preferable that the vehicle further comprises a steering operation tool and a steering support portion that supports the steering operation tool, and that the operation tool is supported by the steering support portion via the support member.

[0026] This configuration makes it easy to position the operating tool in the vicinity of the steering operating tool, resulting in improved operability of the work vehicle.

[0027] Furthermore, in the present invention, the operating tool is preferably provided with a detection unit that detects the first swing operation of the operating tool, an electric actuator that operates according to the detection result by the detection unit, and an operated part that is operated by the operation of the electric actuator, and the operating tool is preferably capable of operating the operated part by the first swing operation through the operation of the electric actuator.

[0028] According to this configuration, the operating tool can be operated with a smaller operating force than in a configuration in which the operating tool and the operated part are mechanically linked via, for example, a wire, etc. This improves the operability of the operating tool.

[0029] Furthermore, in the present invention, it is preferable that the vehicle includes a drive source, a traveling device driven by power from the drive source, and a hydrostatic continuously variable transmission that changes the speed of the power from the drive source to the traveling device, and that the operating tool is capable of operating the speed change state of the hydrostatic continuously variable transmission by the first swing operation.

[0030] This configuration can prevent the operator from unintentionally changing the speed-changing state of the hydrostatic continuously variable transmission. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 2 is a left side view of the tractor. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is a left side view in vertical section showing the configuration of an operating mechanism and the like. [Figure 5] FIG. [Figure 6] FIG. 4 is a vertical cross-sectional rear view showing the configuration of the first holding mechanism and the like. [Figure 7] FIG. 10 is a longitudinal sectional rear view showing the operation mechanism when a second swinging operation is performed. [Figure 8] 10A and 10B are diagrams showing the configuration of an operating mechanism and the like when viewed along the direction of an elastic force acting from an elastic member to a holding portion. [Figure 9]1 is a cross-sectional plan view showing the configuration of the operating mechanism and the like when the shuttle lever is located at a first operating position. FIG. [Figure 10] 10 is a cross-sectional plan view showing the configuration of the operating mechanism and the like when the shuttle lever is located at the second operating position. FIG. [Figure 11] 10 is a cross-sectional plan view showing the configuration of the operating mechanism and the like when the shuttle lever is located at a third operating position. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0032] 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 "front," 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 in the drawings will be referred to as "up," and the direction of arrow D as "down."

[0033] In addition, the directions of the arrows F, B, L, R, U, and D in the figure correspond to the front, rear, left, right, top, and bottom of the tractor 1 (corresponding to the "work vehicle" of the present invention).

[0034] [Overall configuration of the tractor] As shown in Figures 1 and 2, the tractor 1 is equipped with a drive source 2, a power transmission device 3, left and right front wheels 4 (corresponding to the "running device" of the present invention), and left and right rear wheels 5 (corresponding to the "running device" of the present invention).

[0035] The drive source 2 is configured by an engine (internal combustion engine), an electric motor, etc. Power from the drive source 2 is transmitted to left and right front wheels 4 and left and right rear wheels 5 via a power transmission device 3. This drives the left and right front wheels 4 and left and right rear wheels 5.

[0036] That is, the tractor 1 has left and right front wheels 4 and left and right rear wheels 5 that are driven by power from a drive source 2 .

[0037] The power transmission device 3 has a hydrostatic continuously variable transmission 6. The hydrostatic continuously variable transmission 6 changes the speed of the power from the drive source 2 to the left and right front wheels 4 and the left and right rear wheels 5. In other words, the tractor 1 is equipped with the hydrostatic continuously variable transmission 6 that changes the speed of the power from the drive source 2 to the left and right front wheels 4 and the left and right rear wheels 5.

[0038] The structure of the hydrostatic continuously variable transmission 6 is well known and therefore will not be described in detail. However, as shown in FIG. 2, the hydrostatic continuously variable transmission 6 has a trunnion shaft 7 (corresponding to the "operated portion" according to the present invention). When the trunnion shaft 7 is operated, the angle of a swash plate (not shown) inside the hydrostatic continuously variable transmission 6 changes. This allows the hydrostatic continuously variable transmission 6 to change its state among a forward state, a neutral state, and a reverse state.

[0039] When the hydrostatic continuously variable transmission 6 is in a forward state, power in the forward direction is transmitted to the left and right front wheels 4 and the left and right rear wheels 5. This causes the tractor 1 to move forward.

[0040] When the hydrostatic continuously variable transmission 6 is in the neutral state, power is not transmitted to the left and right front wheels 4 and the left and right rear wheels 5. This causes the tractor 1 to stop.

[0041] When the hydrostatic continuously variable transmission 6 is in a reverse state, power in the reverse direction is transmitted to the left and right front wheels 4 and the left and right rear wheels 5. This causes the tractor 1 to move backward.

[0042] As shown in Figures 1 and 2, the tractor 1 is equipped with a driving unit 8. The driving unit 8 is located behind the drive source 2 and above the hydrostatic continuously variable transmission 6 (power transmission device 3). Behind the driving unit 8, a rope frame 10 is provided.

[0043] The driver's section 8 has a driver's seat 9, a steering operation device 11, and an operation mechanism 12. The operation mechanism 12 has a shuttle lever 13 (corresponding to the "operation device" according to the present invention). The operator (in other words, a passenger or worker) can operate the steering operation device 11 and the shuttle lever 13 by hand while sitting in the driver's seat 9.

[0044] Although not particularly limited, the steering operation tool 11 in this embodiment is a steering wheel. The direction of the left and right front wheels 4 changes left and right in response to the operation of the steering operation tool 11. This allows the tractor 1 to be steered.

[0045] The tractor 1 is also configured so that the trunnion shaft 7 is operated in response to the operation of the shuttle lever 13. That is, the tractor 1 changes state among a forward state, a neutral state, and a reverse state in response to the operation of the shuttle lever 13 (operation mechanism 12). In this way, the tractor 1 is provided with the operation mechanism 12 for operating the tractor 1.

[0046] An implement support mechanism 14 is provided at the rear of the machine body (vehicle body) of the tractor 1. The implement support mechanism 14 is capable of supporting a work implement such as a tilling implement, for example.

[0047] [Shuttle lever and electric actuator] As shown in Fig. 3, the shuttle lever 13 is configured to be capable of a first swing operation. The first swing operation is a swing operation around a first axis P1. As shown in Fig. 4, the first axis P1 is aligned with the up-down direction of the body of the tractor 1. That is, the first swing operation is a swing operation in the front-rear direction.

[0048] Strictly speaking, the first axis P1 of this embodiment is slightly tilted upward toward the rear of the body of the tractor 1. This state of being slightly tilted relative to the vertical direction is also included in the expression "aligned with the vertical direction."

[0049] 3, the shuttle lever 13 can be moved by a first pivoting operation among a first operating position Q1, a second operating position Q2, and a third operating position Q3. The second operating position Q2 is located rearward of the first operating position Q1. The second operating position Q2 is located forward of the third operating position Q3. That is, the second operating position Q2 is located between the first operating position Q1 and the third operating position Q3.

[0050] The first operating position Q1 corresponds to a forward state in which the tractor 1 moves forward. The second operating position Q2 corresponds to a neutral state in which the tractor 1 is stopped. The third operating position Q3 corresponds to a reverse state in which the tractor 1 moves backward.

[0051] As shown in Fig. 4, the tractor 1 is equipped with a detection unit 15. The detection unit 15 detects the operation position of the shuttle lever 13 around the first axis P1. In this way, the detection unit 15 detects the first swing operation of the shuttle lever 13. Although not particularly limited, the detection unit 15 may be configured by, for example, a potentiometer.

[0052] In this way, the tractor 1 is provided with the detection unit 15 that detects the first swing operation of the shuttle lever 13.

[0053] As shown in Fig. 2, the tractor 1 is equipped with an electric actuator 16. Although not particularly limited, the electric actuator 16 in this embodiment is configured by an electric motor. A gear mechanism (not shown) is provided between the electric actuator 16 and the trunnion shaft 7. The electric actuator 16 is configured to be able to operate the trunnion shaft 7 via the gear mechanism.

[0054] The electric actuator 16 is configured to operate in accordance with the detection result by the detection unit 15. The trunnion shaft 7 is operated by the operation of the electric actuator 16. In other words, the tractor 1 is equipped with the electric actuator 16 that operates in accordance with the detection result by the detection unit 15, and the trunnion shaft 7 that is operated by the operation of the electric actuator 16.

[0055] With the configuration described above, the operator can operate the trunnion shaft 7 by performing the first swing operation of the shuttle lever 13. As a result, the speed change state of the hydrostatic continuously variable transmission 6 changes.

[0056] More specifically, when the shuttle lever 13 is operated to the first operating position Q1, the speed change state of the hydrostatic continuously variable transmission 6 becomes a forward state. When the shuttle lever 13 is operated to the second operating position Q2, the speed change state of the hydrostatic continuously variable transmission 6 becomes a neutral state. When the shuttle lever 13 is operated to the third operating position Q3, the speed change state of the hydrostatic continuously variable transmission 6 becomes a reverse state.

[0057] In this way, the shuttle lever 13 is configured so that its position can be changed between the first operating position Q1 and the second operating position Q2 by the first swing operation, and so that the tractor 1 can be operated by the first swing operation. The shuttle lever 13 is also configured so that its position can be changed to the third operating position Q3 by the first swing operation, and so that the tractor 1 can be switched between forward and reverse travel by the first swing operation. The shuttle lever 13 is also configured so that the trunnion shaft 7 can be operated by the first swing operation through the operation of the electric actuator 16. The shuttle lever 13 is also configured so that the speed change state of the hydrostatic continuously variable transmission 6 can be operated by the first swing operation.

[0058] [Support structure for operation mechanism] As shown in Figures 3 and 5, the tractor 1 is equipped with a steering operation shaft 17 and a steering post 18 (corresponding to the "steering support section" according to the present invention). The steering operation shaft 17 is connected to the steering operation device 11 and extends in the vertical direction of the body of the tractor 1. The steering operation device 11 and the steering operation shaft 17 are integrally rotatable around a rotation axis Y. The rotation axis Y passes through the center of the steering operation shaft 17 and extends in the vertical direction of the body of the tractor 1.

[0059] The steering post 18 is a cylindrical member that covers most of the steering operation shaft 17. The steering post 18 is fixed to the body of the tractor 1. The steering post 18 supports the steering operation device 11 and the steering operation shaft 17. In other words, the tractor 1 is equipped with the steering post 18 that supports the steering operation device 11.

[0060] As shown in FIGS. 4 and 5, the steering operation shaft 17 and the steering post 18 are housed in a post cover 19.

[0061] 3 and 5, a mounting stay 20 is fixed to the steering post 18. The operation mechanism 12 also includes a support member 21 and a swinging part 22. The swinging part 22 includes the shuttle lever 13. As shown in FIG. 3, the swinging part 22 is configured to swing around a first axis P1 relative to the support member 21 in response to a first swing operation of the shuttle lever 13.

[0062] The support member 21 is a plate-shaped member that is oriented perpendicular to the first axis P1. The support member 21 is supported by the mounting stay 20 in a state in which it abuts against the mounting stay 20 from above. The support member 21 is fastened to the mounting stay 20 by a plurality of first bolts b1. The swinging portion 22 is supported by the support member 21. With this configuration, the shuttle lever 13 is supported by the support member 21. The shuttle lever 13 is also supported by the steering post 18 via the support member 21 and the mounting stay 20.

[0063] That is, the operation mechanism 12 includes a support member 21 that supports the shuttle lever 13. The shuttle lever 13 is supported by the steering post 18 via the support member 21.

[0064] [Configuration of operation mechanism] 5 to 7, the swinging portion 22 has a case portion 23, a holding portion 24, a ball portion 25 (corresponding to the "fitting portion" according to the present invention), and an elastic member 26. The operating mechanism 12 also has a swing operation shaft 27.

[0065] The base end of the shuttle lever 13 is fixed to the left side of the case portion 23, for example, by welding. The shuttle lever 13 extends to the left from the case portion 23. The holding portion 24 is configured in a cylindrical shape extending along the first axis P1. The holding portion 24 is fixed to the right end of the case portion 23, for example, by welding. With this configuration, the holding portion 24 is connected to the shuttle lever 13 via the case portion 23.

[0066] At least a portion of ball portion 25 fits into retaining portion 24. As a result, retaining portion 24 retains ball portion 25. The diameter of ball portion 25 is approximately the same as the inner diameter of retaining portion 24.

[0067] Although not particularly limited, the elastic member 26 in this embodiment is a coil spring. The elastic member 26 is housed in the holding portion 24. The elastic member 26 is provided across the upper end of the holding portion 24 and the ball portion 25. The ball portion 25 is pressed against the support member 21 from above by the elastic force of the elastic member 26.

[0068] As shown in Fig. 6, the swing operation shaft 27 extends along the first axis P1. The swing operation shaft 27 has a small diameter portion 27a and a large diameter portion 27b. The large diameter portion 27b is located at the bottom of the swing operation shaft 27. The small diameter portion 27a extends upward from the upper end of the large diameter portion 27b.

[0069] The case portion 23 accommodates the small diameter portion 27a. The case portion 23 is connected to the upper end of the small diameter portion 27a by a pin 28 so as to be rotatable around the second axis P2. The pin 28 extends along the second axis P2.

[0070] The second shaft center P2 extends in a direction intersecting with the first shaft center P1. More specifically, as shown in Fig. 4, the second shaft center P2 is aligned with the front-rear direction of the body of the tractor 1.

[0071] Strictly speaking, the second shaft center P2 in this embodiment is inclined slightly downward toward the rear of the body of the tractor 1. This state of being slightly inclined relative to the front-to-rear direction is also included in the expression "along the front-to-rear direction." Furthermore, although not particularly limited, the second shaft center P2 in this embodiment extends perpendicular to the first shaft center P1.

[0072] As shown in FIGS. 5 to 7, the lower end of the case portion 23 is formed in an arc shape centered on the second axis P2, and abuts against the support member 21 from above.

[0073] 6, large diameter portion 27b has a larger diameter than small diameter portion 27a. Small diameter portion 27a penetrates support member 21. The upper end surface of large diameter portion 27b abuts against the lower surface of support member 21. In addition, the lower end portion of large diameter portion 27b and sensing unit 15a of detection unit 15 are connected.

[0074] When the first swing operation of the shuttle lever 13 is performed, the shuttle lever 13, case portion 23, swing operation shaft 27, pin 28, sensing portion 15a, holding portion 24, ball portion 25, and elastic member 26 swing (rotate) integrally around the first axis P1. Then, as the sensing portion 15a rotates around the first axis P1, the detection portion 15 outputs a detection signal (corresponding to the "detection result" according to the present invention) corresponding to the rotation of the sensing portion 15a. The electric actuator 16 described above is configured to operate in response to the detection signal.

[0075] With the configuration described above, when the first swing operation is performed, the ball portion 25 is configured to swing around the first axis P1 together with the shuttle lever 13 and the holding portion 24 while being held by the holding portion 24.

[0076] 4 to 6, the operation mechanism 12 includes a detection support part 29. The detection support part 29 is fixed to the rear end part of the support member 21 by, for example, welding. The detection support part 29 is provided so as to span the support member 21 and the detection part 15.

[0077] Although not particularly limited, in this embodiment, the detection unit 15 is fastened to the detection support unit 29 by a plurality of second bolts b2.

[0078] [First holding mechanism] 6 to 8, the operation mechanism 12 includes a first holding mechanism K1. The first holding mechanism K1 has a first engagement portion 31 and a second engagement portion 32. The first engagement portion 31 and the second engagement portion 32 are configured to be able to engage with each other.

[0079] More specifically, the first engagement portion 31 protrudes downward from the lower end of the left end portion of the case portion 23. That is, the first engagement portion 31 is connected to the shuttle lever 13 via the case portion 23. When the first pivoting operation of the shuttle lever 13 is performed, the first engagement portion 31 pivots integrally with the shuttle lever 13 around the first axis P1.

[0080] The second engagement portion 32 is formed on the left end of the support member 21. The second engagement portion 32 is a recess that recesses to the right. The second engagement portion 32 is formed so as to be able to receive the first engagement portion 31.

[0081] As such, the first holding mechanism K1 has a first engagement portion 31 connected to the shuttle lever 13 and a second engagement portion 32 provided on the support member 21 and capable of engaging with the first engagement portion 31.

[0082] 8, the second engagement portion 32 is provided at a position corresponding to the position of the first engagement portion 31 when the shuttle lever 13 is located at the second operating position Q2 (in other words, a position facing the first engagement portion 31 at that time). The first holding mechanism K1 is configured so that the first engagement portion 31 and the second engagement portion 32 engage with each other, thereby being able to hold the shuttle lever 13 at the second operating position Q2.

[0083] As described above, the case 23 is connected to the upper end of the small diameter portion 27a so as to be rotatable around the second axis P2. This allows the shuttle lever 13 to perform a second swing operation, as shown in Figures 5 to 7. The second swing operation is a swing operation around the second axis P2.

[0084] In this way, the shuttle lever 13 is configured to be capable of a first swing operation, which is a swing operation around the first axis P1, and a second swing operation, which is a swing operation around the second axis P2 in a direction intersecting the first axis P1.

[0085] 8, when viewed from the direction of the elastic force acting from elastic member 26 to holding portion 24, elastic member 26 is disposed on the opposite side of second axis P2 from first engagement portion 31. As a result, the elastic force of elastic member 26 acts in a direction that rotates holding portion 24, case portion 23, and shuttle lever 13 around second axis P2. More specifically, the elastic force acts in a direction that swings shuttle lever 13 downward in the up-down direction of the body of tractor 1.

[0086] As a result, the elastic force of the elastic member 26 acts in a direction that moves the first engagement portion 31 closer to the second engagement portion 32 when the shuttle lever 13 is located at the second operating position Q2.

[0087] That is, the elastic force of the elastic member 26 acts in a direction to rotate the shuttle lever 13 around the second axis P2, and also acts in a direction to move the first engagement portion 31 closer to the second engagement portion 32 when the shuttle lever 13 is positioned at the second operating position Q2.

[0088] In the state shown in Fig. 6, the first engagement portion 31 and the second engagement portion 32 are engaged with each other. At this time, when the shuttle lever 13 is lifted against the elastic force of the elastic member 26 by the second swing operation as shown in Fig. 7, the elastic member 26 is compressed and the first engagement portion 31 moves away from the second engagement portion 32. As a result, the engagement between the first engagement portion 31 and the second engagement portion 32 is released.

[0089] That is, the first holding mechanism K1 is configured so that the first engagement portion 31 and the second engagement portion 32 are engaged with each other to hold the shuttle lever 13 at the second operating position Q2, and the second swing operation can disengage the first engagement portion 31 and the second engagement portion 32. When the first engagement portion 31 and the second engagement portion 32 are engaged with each other, the shuttle lever 13 is lifted against the elastic force, thereby disengaging the first engagement portion 31 and the second engagement portion 32.

[0090] [Regulation Department] 9 to 11, the second engagement portion 32 has a restricting portion 33. Although not particularly limited, the restricting portion 33 in this embodiment is configured by a first protruding portion 34 and a second protruding portion 35. The first protruding portion 34 and the second protruding portion 35 are both formed on the left end portion of the support member 21 and are angular portions that protrude to the left. The first protruding portion 34 is located forward of the second protruding portion 35.

[0091] The rear portion of the first protrusion 34 is formed like a wall so as to restrict the first engagement portion 31 from moving forward over the first protrusion 34. The front portion of the first protrusion 34 is gently inclined so as to allow the first engagement portion 31 to move rearward over the first protrusion 34.

[0092] The front part of the second protrusion 35 is formed like a wall so as to restrict the first engagement part 31 from moving rearward over the second protrusion 35. The rear part of the second protrusion 35 is gently inclined so as to allow the first engagement part 31 to move forward over the second protrusion 35.

[0093] With this configuration, the restricting unit 33 restricts the first pivoting operation from the second operating position Q2 to the first operating position Q1 and the first pivoting operation from the second operating position Q2 to the third operating position Q3, thereby locking the shuttle lever 13 when the shuttle lever 13 is located at the second operating position Q2.

[0094] In this way, the second engagement portion 32 has a regulating portion 33 that regulates the first pivoting operation from the second operating position Q2 to the first operating position Q1 and the first pivoting operation from the second operating position Q2 to the third operating position Q3.

[0095] Furthermore, in a state where the engagement between the first engagement portion 31 and the second engagement portion 32 is released by the second swing operation (see FIG. 7), the first engagement portion 31 does not abut against the wall-like portions of the first protrusion 34 and the second protrusion 35. Therefore, the restricting portion 33 does not restrict the first swing operation in a state where the engagement between the first engagement portion 31 and the second engagement portion 32 is released. As a result, the lock of the shuttle lever 13 by the restricting portion 33 is released.

[0096] In this way, the regulating portion 33 is configured not to regulate the first swing operation from the first operating position Q1 to the second operating position Q2, and the first swing operation from the third operating position Q3 to the second operating position Q2, and is also configured not to regulate the first swing operation when the engagement between the first engagement portion 31 and the second engagement portion 32 is released by the second swing operation.

[0097] The operator can perform the first swing operation from the second operating position Q2 to the first operating position Q1, and the first swing operation from the second operating position Q2 to the third operating position Q3 by performing the first swing operation while disengaging the first engagement portion 31 and the second engagement portion 32 by performing the second swing operation (lifting the shuttle lever 13).

[0098] [Second holding mechanism] As shown in FIG. 6, the operation mechanism 12 includes a second holding mechanism K2. The second holding mechanism K2 is a detent mechanism. The above-mentioned holding portion 24, ball portion 25, and elastic member 26 are included in the second holding mechanism K2. As shown in FIG. 9, the second holding mechanism K2 includes a first fitted portion 41, a second fitted portion 42, and a third fitted portion 43. The first fitted portion 41, the second fitted portion 42, and the third fitted portion 43 are all holes formed in the support member 21.

[0099] As shown in Fig. 9, the first fitted portion 41 is provided at a position corresponding to the position of the ball portion 25 when the shuttle lever 13 is located at the first operating position Q1 (in other words, a position facing the ball portion 25 at that time). As shown in Fig. 10, the second fitted portion 42 is provided at a position corresponding to the position of the ball portion 25 when the shuttle lever 13 is located at the second operating position Q2 (in other words, a position facing the ball portion 25 at that time). As shown in Fig. 11, the third fitted portion 43 is provided at a position corresponding to the position of the ball portion 25 when the shuttle lever 13 is located at the third operating position Q3 (in other words, a position facing the ball portion 25 at that time).

[0100] The ball portion 25 has a shape that allows it to be fitted into the first fitted portion 41, the second fitted portion 42, and the third fitted portion 43.

[0101] That is, the second holding mechanism K2 has a first fitted portion 41 provided on the support member 21, a ball portion 25 that can be fitted into the first fitted portion 41, a holding portion 24 that is connected to the shuttle lever 13 and holds the ball portion 25, and an elastic member 26 that is provided across the holding portion 24 and the ball portion 25 and presses the ball portion 25 toward the support member 21. The second holding mechanism K2 also has a second fitted portion 42 provided on the support member 21.

[0102] 9, when the shuttle lever 13 is operated to the first operating position Q1, the ball portion 25 fits into the first fitted portion 41. This holds the shuttle lever 13 at the first operating position Q1. That is, the second holding mechanism K2 can hold the shuttle lever 13 at the first operating position Q1 by fitting the ball portion 25 into the first fitted portion 41.

[0103] 10, when the shuttle lever 13 is operated to the second operating position Q2, the ball portion 25 fits into the second fitted portion 42. This holds the shuttle lever 13 at the second operating position Q2. That is, the second holding mechanism K2 can hold the shuttle lever 13 at the second operating position Q2 by fitting the ball portion 25 into the second fitted portion 42.

[0104] 11, when the shuttle lever 13 is operated to the third operating position Q3, the ball portion 25 fits into the third fitted portion 43. As a result, the shuttle lever 13 is held in the third operating position Q3.

[0105] With the configuration described above, the second holding mechanism K2 can hold the position of the shuttle lever 13. That is, the operation mechanism 12 is equipped with the first holding mechanism K1 and the second holding mechanism K2 that can hold the position of the shuttle lever 13.

[0106] It should be noted that the second holding mechanism K2 does not restrict the first swing operation of the shuttle lever 13. For example, when the ball portion 25 is engaged with the first fitted portion 41, if the operator performs the first swing operation of the shuttle lever 13 with a certain level of operating force or more, the ball portion 25 climbs onto the edge of the first fitted portion 41 and disengages from the first fitted portion 41. This releases the positional hold by the second holding mechanism K2. This is also the case when the ball portion 25 is engaged with the second fitted portion 42 or the third fitted portion 43.

[0107] In this embodiment, as shown in FIG. 8, when viewed from the direction of the elastic force acting from the elastic member 26 to the holding portion 24, the shuttle lever 13 is disposed on the opposite side of the second axis P2 from the elastic member 26.

[0108] According to the configuration described above, when the shuttle lever 13 is located at the second operating position Q2, the elastic force of the elastic member 26 presses the first engagement portion 31 against the second engagement portion 32. This allows the shuttle lever 13 to be stably held at the second operating position Q2 by the first holding mechanism K1. As a result, it is possible to prevent the first swing operation from being unintentionally performed.

[0109] Furthermore, according to the configuration described above, when the shuttle lever 13 reaches the first operating position Q1, the ball portion 25 engages with the first fitted portion 41. This makes the swing operation to the first operating position Q1 accompanied by a clicking sensation. As a result, the operability of the shuttle lever 13 is improved.

[0110] Furthermore, according to the configuration described above, by performing the second swing operation against the elastic force of elastic member 26, it is possible to disengage first engagement portion 31 and second engagement portion 32. This enables the first swing operation of shuttle lever 13. Moreover, according to the configuration described above, it is not necessary to provide a guide member having a cam surface that guides the members (ball portion 25 and holding portion 24) pushed by elastic member 26.

[0111] That is, according to the configuration described above, it is possible to prevent the shuttle lever 13 from being unintentionally swung, and it is possible to realize an operation mechanism 12 that is easy to operate and has a relatively simple configuration.

[0112] Other Embodiments (1) Instead of the left and right front wheels 4 and the left and right rear wheels 5, crawler or semi-crawler type running devices may be provided.

[0113] (2) The arrangement of some or all of the components may be reversed left to right.

[0114] (3) When viewed from the direction of the elastic force acting on the holding portion 24 from the elastic member 26, the shuttle lever 13 may be disposed on the opposite side of the second axis P2 from the first engagement portion 31.

[0115] (4) The first engaging portion 31 may be a recess, and the second engaging portion 32 may be a protrusion that can engage with the first engaging portion 31.

[0116] (5) The second fitted portion 42 does not have to be provided.

[0117] (6) The third fitted portion 43 does not have to be provided.

[0118] (7) The first operating position Q1 may correspond to the neutral state or the reverse state.

[0119] (8) The second operating position Q2 may correspond to the forward or reverse state.

[0120] (9) The third operating position Q3 may correspond to the forward state or the neutral state.

[0121] (10) The first axis P1 may extend in any direction.

[0122] (11) The second axis P2 may extend in any direction.

[0123] (12) The "operating tool" according to the present invention is not limited to the shuttle lever 13. Any operating tool other than the shuttle lever 13 may be provided as the "operating tool" according to the present invention, and the operating target of the operating tool may be any part other than the trunnion shaft 7.

[0124] 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 purpose of the present invention. [Industrial Applicability]

[0125] The present invention can be used in an operating mechanism and a work vehicle. [Explanation of symbols]

[0126] 1: Tractor (work vehicle) 2: Drive source 4: Front wheel (running gear) 5: Rear wheel (running gear) 6: Hydrostatic continuously variable transmission 7: Trunnion shaft (operated part) 11: Steering controls 12 :Operating mechanism 13: Shuttle lever (operating tool) 15: Detection unit 16: Electric actuator 18: Steering post (steering support part) 21: Support member 24: Holding part 25: Ball part (fitting part) 26: Elastic member 31: First engagement portion 32: Second engagement portion 33: Regulation Department 41:First mated part 42:Second mated part K1: 1st holding mechanism K2:Second holding mechanism P1: 1st axis P2: 2nd axis Q1: 1st operation position Q2: 2nd operating position Q3: 3rd operating position

Claims

1. An operating mechanism for operating a work vehicle, An operating tool, a support member for supporting the operating tool, the operating tool is configured to be capable of a first swing operation which is a swing operation around a first axis and a second swing operation which is a swing operation around a second axis in a direction intersecting the first axis, the operating tool can be changed in position between a first operating position and a second operating position by the first swing operation, and the work vehicle can be operated by the first swing operation, a first holding mechanism and a second holding mechanism capable of holding the position of the operating tool; the first holding mechanism has a first engagement portion connected to the operating tool and a second engagement portion provided on the support member and engageable with the first engagement portion, the second engagement portion is provided at a position corresponding to a position of the first engagement portion when the operating tool is located at the second operating position, the first holding mechanism is configured so that the first engaging portion and the second engaging portion are engaged with each other to hold the operating tool in the second operating position, and the engagement between the first engaging portion and the second engaging portion is disengaged by the second swing operation, the second holding mechanism includes a first fitted portion provided on the support member, a fitting portion that can be fitted into the first fitted portion, a holding portion that is connected to the operating tool and holds the fitting portion, and an elastic member that is provided across the holding portion and the fitting portion and presses the fitting portion toward the support member, the fitting portion is configured to swing around the first axis integrally with the operating tool and the holding portion while being held by the holding portion when the first swing operation is performed, the first fitted portion is provided at a position corresponding to a position of the fitting portion when the operating tool is located at the first operating position, the second holding mechanism is capable of holding the operating tool at the first operating position by the fitting portion fitting into the first fitted portion, When viewed from a direction of an elastic force acting on the holding portion from the elastic member, the elastic member is disposed on an opposite side to the first engaging portion with respect to the second axis, An operating mechanism in which the elastic force acts in a direction to rotate the operating tool around the second axis and, when the operating tool is positioned in the second operating position, in a direction to move the first engagement portion closer to the second engagement portion.

2. the second holding mechanism has a second fitted portion provided on the support member, the second fitted portion is provided at a position corresponding to a position of the fitting portion when the operating tool is located at the second operating position, The operating mechanism according to claim 1 , wherein the second holding mechanism is capable of holding the operating tool in the second operating position by fitting the fitting portion into the second fitted portion.

3. The first axis is aligned along the vertical direction of the body of the work vehicle, The operation mechanism according to claim 1 or 2, wherein the second axis is aligned along the longitudinal direction of the machine body.

4. the elastic force acts in a direction that swings the operating tool downward in the up-down direction of the aircraft body, 4. The operating mechanism according to claim 3, wherein when the first engagement portion and the second engagement portion are engaged with each other, the engagement between the first engagement portion and the second engagement portion is released by lifting the operating tool against the elastic force.

5. the operating tool can be changed to a third operating position by the first swing operation, and the first swing operation can switch between forward and backward travel of the work vehicle, the second operating position is located between the first operating position and the third operating position, the first operating position corresponds to a forward movement state in which the work vehicle moves forward, the second operating position corresponds to a neutral state in which the work vehicle is stopped, the third operating position corresponds to a reverse state in which the work vehicle moves backward, the second engagement portion has a restriction portion that restricts the first pivoting operation from the second operating position to the first operating position and the first pivoting operation from the second operating position to the third operating position, 3. The operating mechanism according to claim 1, wherein the regulating portion is configured not to regulate the first swing operation from the first operating position to the second operating position and the first swing operation from the third operating position to the second operating position, and is configured not to regulate the first swing operation when the engagement between the first engagement portion and the second engagement portion is released by the second swing operation.

6. A work vehicle comprising the operating mechanism according to claim 1.

7. A steering control; a steering support portion that supports the steering operation tool, The work vehicle according to claim 6, wherein the operating tool is supported by the steering support portion via the support member.

8. a detection unit that detects the first swing operation of the operating tool; an electric actuator that operates in response to the detection result by the detection unit; an operated portion that is operated by the operation of the electric actuator, The work vehicle according to claim 6 or 7, wherein the operating tool is capable of operating the operated part through the operation of the electric actuator by the first swing operation.

9. A driving source; a traveling device driven by power from the drive source; a hydrostatic continuously variable transmission that changes the speed of power from the drive source to the traveling device, 8. The work vehicle according to claim 6, wherein the operating tool is capable of operating the speed change state of the hydrostatic continuously variable transmission by the first swing operation.

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