CN214623452U - Operation device for working vehicle - Google Patents

Abstract

The utility model provides a can improve the operating means of operation vehicle of operability. A lift operation device (40) of a tractor (1) can switch a hydraulic lift device (5) to either a raised position or a lowered position, and is provided with: a lift lever (50) which can be rotationally operated about a lever rotational shaft (52) and which can be rotationally operated to switch the hydraulic lift device (5) to either one of a raised position and a lowered position; and a release button (80) which can be pushed in and which can switch the hydraulic lifting device (5) to the other of the raised position and the lowered position by being pushed in.

Description

Operation device for working vehicle

Technical Field

The present invention relates to a technique of an operating device of a working vehicle capable of switching a hydraulic lifting device to any one of a rising position and a falling position.

Background

Conventionally, a technique of an operation device of a work vehicle capable of switching a hydraulic lifting device to either a lifting position or a lowering position is known. For example, as described in patent document 1.

An elevating lever (operation device) of a tractor (work vehicle) described in patent document 1 is rotatably supported by a lever support shaft. The lift arm (hydraulic lift device) can be switched to the raised position or the lowered position by rotating the lift lever.

In the tractor described in patent document 1, both the switching to the raised position and the switching to the lowered position are performed by the operation of the lift lever. In this configuration, it is difficult to distinguish the operation method (rotation direction) of the lift lever when the lift arm is switched to the raised position or the lowered position, and there is a possibility that the raised position and the lowered position cannot be smoothly switched. Thus, in the conventional technology, there is room for improvement in operability of the lifter.

Patent document

Patent document 1: japanese patent laid-open publication No. 2005-185107

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved by the utility model

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an operation device for a working vehicle, which can improve operability.

Means for solving the problems

The technical problem to be solved by the present invention is as described above, and then, means for solving the technical problem will be described.

That is, according to claim 1, an operation device for a work vehicle capable of switching a hydraulic lifting device to either a lifting position or a lowering position includes: a first operating tool that can be rotationally operated about a first rotational axis and that can switch the hydraulic lift device to either the raised position or the lowered position by being rotationally operated; and a second operation tool that can be press-fitted and can switch the hydraulic lifting device to the other of the raised position and the lowered position by being press-fitted.

In claim 2, the first operating device is configured to be capable of being rotationally operated to a first operating position in which the hydraulic lifting device is switchable to the raised position and a second operating position in which the hydraulic lifting device is switchable to the lowered position, and to be biased toward the second operating position, and the operating device of the work vehicle further includes a linking portion capable of holding the first operating device in the first operating position and releasing holding of the first operating device based on an operation of the second operating device.

In claim 3, the contact unit includes: an engaging portion that is engaged with the first operating tool to restrict a rotational operation of the first operating tool from the first operating position to the second operating position; and a coupling portion coupled to the second operating tool, wherein the coupling portion is configured to be rotatable about a second rotation axis based on an operation of the second operating tool, and thereby to release engagement between the first operating tool and the engagement portion.

In claim 4, the engagement portion allows the first operating tool to be rotated from the second operating position to the first operating position.

In claim 5, the coupling portion is arranged to extend from one side to the other side of the first operating tool in the axial direction of the first rotating shaft of the first operating tool.

In claim 6, the second manipulation tool is disposed on one side of the first manipulation tool in an axial direction of the first rotating shaft of the first manipulation tool.

In claim 7, the second operating tool can be press-fitted in a direction that is not parallel to and perpendicular to the first rotation axis of the first operating tool.

In claim 8, the first operating device is disposed on an upper surface of a console cover disposed on a side of the seat, and the second operating device is disposed on a side surface of the console cover.

In claim 9, the second operating tool is disposed so that at least a part thereof is located inside the console cover as compared with a side surface of the console cover.

In claim 10, the first operating tool is rotatable about the first rotation axis extending from the left-right inner front side to the left-right outer rear side, and the second operating tool is press-fit operable in the left-right direction.

Effect of the utility model

As the effect of the present invention, the following effect is obtained.

In claim 1, the operability can be improved.

In claim 2, the operation device can be simplified.

In claim 3, the operation device can be simplified.

In claim 4, the operability of the first operation tool can be improved.

In claim 5, the operating device can be made compact.

In claim 6, the operability can be improved.

In claim 7, the operability can be improved.

In claim 8, the operability can be improved.

In claim 9, the second operation tool can be prevented from being inadvertently touched.

In claim 10, the operability can be improved.

Drawings

Fig. 1 is a side view showing a tractor according to an embodiment of the present invention.

Fig. 2 is a plan view showing the interior of the cabin.

Fig. 3 is an enlarged plan view showing the right portion of the interior of the cab.

Fig. 4 is a perspective view showing the drawbar, positioning rod, console cover, and lift operating device.

Fig. 5 (a) is an enlarged side view showing the front upper portion of the console cover, and (b) is a sectional view a 1-a 1.

Fig. 6 is a perspective view showing the positioning rod and the link mechanism.

Fig. 7 (a) is also a side view. (b) Is a rear view showing the lower portion of the link mechanism.

Fig. 8 is a front perspective view showing the lift operation device.

Fig. 9 (a) is an enlarged front perspective view showing an upper portion of the lift operation device. (b) Is an enlarged front perspective view showing the lower part of the lifting operation device.

Fig. 10 is an enlarged rear perspective view showing an upper portion of the lift operation device.

Fig. 11 is a plan view showing the lift operation device.

Fig. 12 is a view of the lift operation device as viewed from the direction of arrow X2 shown in fig. 11.

Fig. 13 is a view of the elevation operation device as viewed from the direction of arrow Y shown in fig. 11.

Fig. 14 is a side view showing the arm portion.

Fig. 15 (a) is a diagram showing a state in which the lifter lever located at the first operation position is rotationally operated toward the lift operation position. (b) The side view shows the operation of the arm portion in fig. 15 (a).

Fig. 16 (a) is a plan view showing the operation of the coupling portion in fig. 15 (a). (b) The top view shows the operation of the link portion when the lift lever is switched to the second operation position.

Fig. 17 is a plan view showing the operation of the link portion when the release button is pushed.

Fig. 18 is a side view showing a state of the arm portion when the positioning lever is operated.

Description of the symbols

Tractor 1 (working vehicle)

5 Hydraulic lifting device

40 lifting operation device (operation device)

50 lifting bar (first operating appliance)

52-rod rotating shaft

80 Release button (second operating device)

Detailed Description

Hereinafter, directions indicated by arrows U, D, F, B, L, and R in the drawings will be defined as up, down, front, rear, left, and right directions, respectively.

Hereinafter, the overall configuration of a tractor 1 including a lift operation device 40 according to an embodiment of the present invention will be described with reference to fig. 1.

The tractor 1 mainly includes: the vehicle body comprises a machine body frame 2, an engine 3, a gearbox 4, a hydraulic lifting device 5, front wheels 6, rear wheels 7, an engine cover 8, a silencer 9, a cab 10, a working lamp 11 and the like.

The body frame 2 is disposed such that the longitudinal direction thereof faces the front-rear direction. An engine 3 is fixed to the rear portion of the body frame 2. A transmission 4 is disposed behind the engine 3. A hydraulic lifting device 5 is arranged at the rear part of the gearbox 4. Various working devices (for example, a rotary tilling device 12) can be attached to the hydraulic lift device 5.

The front portion of the body frame 2 is supported by a pair of left and right front wheels 6 via a front axle mechanism (not shown). The transmission case 4 is supported by a pair of left and right rear wheels 7 via a rear axle mechanism (not shown).

Further, the engine 3 is covered with an engine cover 8. A muffler 9 for discharging exhaust gas of the engine 3 is disposed on the left side of the engine cover 8. A cabin 10 is provided behind the hood 8. Various operating tools, pedals, and the like are disposed inside the cab 10. A working lamp 11 and the like are disposed above the cab 10.

The power of the engine 3 can be transmitted to the front wheels 6 via the front axle mechanism and to the rear wheels 7 via the rear axle mechanism after being shifted by a transmission (not shown) housed in the transmission case 4. In this way, the front wheels 6 and the rear wheels 7 can be driven and rotated by the power of the engine 3, and the tractor 1 can be driven and run.

Further, the power of the engine 3 can be transmitted to the PTO shaft after being shifted by the transmission. A rotary tilling device 12 is connected to the PTO shaft. The rotary tilling device 12 is disposed at the rear of the tractor 1, and mainly includes: a transmission housing 12a, a rotation shaft 12b, and a plurality of claws 12 c. The transmission housing 12a transmits power from the PTO shaft to the rotary shaft 12b, thereby rotating the rotary shaft 12 b. Thus, the rotary tilling device 12 can tilling a field or the like by rotating the plurality of claws 12 c. The rotary tilling device 12 is configured to be movable up and down by the hydraulic lift device 5.

Next, the structure of the cabin 10 will be described with reference to fig. 2 to 5.

Provided in the cockpit 10 are: a steering wheel 21, a seat 22, a main shift lever 23, a sub shift lever 24, a traction lever 25, a positioning lever 26, a console cover 27, and the like.

The steering wheel 21 shown in fig. 2 is used to adjust the cut angle of the front wheel 6. The seat 22 is for seating a rider. The seat 22 is disposed behind the steering wheel 21.

The main gear lever 23 shown in fig. 2 and 3 is used to change the traveling speed of the tractor 1. The main shift lever 23 is disposed on the right side of the seat 22.

The sub-shift lever 24 is used for shifting the transmission. The sub-shift lever 24 is disposed rightward of the seat 22 and leftward and rearward of the main shift lever 23.

The traction rod 25 is used to switch between the execution and the stop of traction control for automatically raising and lowering the working device in accordance with the traction load of the working device, thereby maintaining a constant traction force. The traction rod 25 is disposed rearward of the sub-shift lever 24.

The positioning rod 26 is used to adjust the hydraulic lift device 5 to an arbitrary height position. The positioning rod 26 is disposed on the right side of the traction rod 25. The hydraulic lift device 5 can be lowered or raised by rotating the positioning rod 26 forward or backward. Further, the height position of the hydraulic lift device 5 can be adjusted according to the operation amount (operation position) of the positioning rod 26.

As shown in fig. 3 and 4, the console cover 27 is appropriately provided with various operating tools. In fig. 4 and 5, for convenience of explanation, the operating tool (e.g., the work light switch 31) other than the elevation operating device 40 among the operating tools disposed on the console cover 27 is not shown. The console cover 27 is formed in a substantially box shape that is long in the front-rear direction. As shown in fig. 5, the console cover 27 includes a through hole 27 a.

The through hole 27a is a hole penetrating the console cover 27 in the right and left directions. A through hole 27a is formed in the front on the left side surface of the console cover 27.

As shown in fig. 3 and 4, the console cover 27 is disposed on the right side of the positioning rod 26. A holder B10 (see fig. 8) for supporting the operation tool is disposed in the console cover 27. As shown in fig. 3, the console cover 27 includes, as operation tools, task lamp switches 31 and 32, a wiper switch 33, a rotational speed setting switch 34, a power assist switch 35, an igniter 36, a PTO lever 37, assist control levers 38 and 39, an elevation operation device 40, and the like.

The work light switches 31 and 32 are used to turn on or off the work light 11. The task light switches 31 and 32 are disposed in the front and rear middle portions of the console cover 27. The task light switches 31 and 32 are arranged in two at a distance in the front-rear direction.

The wiper switch 33 is used to operate a wiper (not shown). The wiper switch 33 is disposed in front of the task light switches 31 and 32.

The rotation speed setting switch 34 is used to set the rotation speed of the engine 3 to a preset rotation speed. The rotation speed setting switch 34 is disposed in front of the wiper switch 33.

The power assist switch 35 is used to suppress a variation in the rotation speed of the engine 3 due to a variation in the load of the working equipment and the like, and keeps the vehicle speed and the rotation speed of the PTO shaft substantially constant. The power assist switch 35 is disposed in front of the rotational speed setting switch 34.

The lighter 36 is used to ignite the tobacco. The igniter 36 is disposed on the right side of the task light switches 31 and 32.

The PTO lever 37 is used to switch whether power is transmitted to the PTO shaft. The PTO lever 37 is disposed in front of the igniter 36 and to the right of the rotation speed setting switch 34 and the power assist switch 35.

The auxiliary control levers 38 and 39 are used to control the supply of the working oil to the working device. The assist levers 38 and 39 are disposed at the front end of the console cover 27 (in front of the power assist switch 35 and the PTO lever 37). The auxiliary levers 38 and 39 are arranged in two at a distance in the front-rear direction.

The lift operation device 40 is used to switch the hydraulic lift device 5 to either one of the raised position and the lowered position by a simple operation. The elevation position is a position at which the hydraulic lifting device 5 is elevated to a predetermined position, specifically, a position at which the height is maximized. The lowering position is a position at which the hydraulic lifting device 5 is lowered to a predetermined position (a position corresponding to the operation position of the positioning rod 26). The lift operation device 40 (more specifically, the lift lever 50) is disposed rearward of the assist control levers 38, 39 and forward of the power assist switch 35 and the PTO lever 37. The elevation operation device 40 is disposed on the right side of the positioning rod 26.

In the tractor 1 configured as described above, the hydraulic lift device 5 can be lowered to an arbitrary position (lowered position) by rotating the positioning rod 26 forward to an arbitrary position, and the tilling operation can be performed by rotating the tilling device 12. At this time, the lowering position can be adjusted according to the operation position of the positioning lever 26, and the height (tilling depth) of the rotary tilling device 12 can be adjusted. In this state, the lowering position and the raising position of the hydraulic lifting device 5 can be switched easily using the lifting operation device 40. The following describes the configurations of the positioning rod 26 and the lift operation device 40.

First, the configuration of the positioning rod 26 will be described with reference to fig. 4, 6, and 7. The positioning rod 26 is rotationally operated in the front-rear direction to adjust the height position of the hydraulic lift device 5. More specifically, the positioning rod 26 can lower the hydraulic lift device 5 by being rotated forward, and can raise the hydraulic lift device 5 by being rotated rearward.

Here, the hydraulic lift device 5 can be lifted and lowered by the hydraulic oil supplied through a control valve (not shown). The control valve is provided with a valve shaft S for switching an internal oil passage. The hydraulic lift device 5 can be raised and lowered arbitrarily by rotating the valve shaft S appropriately. In the present embodiment, the hydraulic lifting device 5 can be raised by rotating the valve shaft S clockwise in fig. 7 (a). Further, the hydraulic lift device 5 can be lowered by rotating the valve shaft S counterclockwise. The valve shaft S is biased counterclockwise by a spring (not shown) provided in the control valve. An arm 62 of the lifting operation device 40 described later is fixed to the valve shaft S. The positioning rod 26 rotates the arm 62 in response to the rotation operation to rotate the valve shaft S. Hereinafter, the following description will be specifically made.

In the following, as shown in fig. 4, 6, and 7, the structure of the positioning lever 26 will be described with reference to the positioning lever 26 that is rotationally operated forward. In the drawings subsequent to fig. 6, unnecessary components are appropriately omitted. Specifically, in fig. 6 and 7, the traction rod 25, the console cover 27, and the like are not shown in order to explain the positioning rod 26 and a link mechanism 28 described later. In the drawings subsequent to fig. 8, the console cover 27 and the like are not shown for explaining the elevation operation device 40.

The positioning rod 26 includes: a lever main body 26a, a tube portion 26b, and an attachment portion 26 c.

The lever main body 26a is a portion that is rotationally operated by the driver. The lever main body 26a is formed in a substantially plate shape. A handle for a driver to hold is fixed to a front upper end of the lever main body 26 a.

The cylindrical portion 26b is a substantially cylindrical portion. The tube portion 26b is disposed such that the axial direction thereof faces the left-right direction. The rear lower end of the rod main body 26a is fixed to the cylindrical portion 26 b. The tube portion 26b is rotatably supported by a rotation shaft a fixed to the vehicle body.

The mounting portion 26c is a portion to which a lever 28a of a link mechanism 28 described later is mounted. The mounting portion 26c is formed in a substantially plate shape. The mounting portion 26c is fixed to the outer periphery of the tube portion 26b and extends forward and downward from the tube portion 26 b.

The link mechanism 28 for transmitting the turning operation to the arm portion 62 is attached to the positioning lever 26 configured as described above. The structure of the link mechanism 28 will be explained below.

The link mechanism 28 includes: a lever 28a, an arm portion 28b, a plate 28c, a shaft portion 28d, and a pressing portion 28 e.

The lever 28a connects the mounting portion 26c to an arm portion 28b formed in a substantially plate shape. The plate 28c is formed in a substantially circular plate shape with the plate surface facing in the left-right direction. An arm portion 28b is fixed to the outer peripheral surface of the plate 28 c.

The shaft portion 28d is disposed so that the axial direction thereof faces the left-right direction, and is appropriately supported so as to be rotatable. A plate 28c is fixed to a middle portion of the shaft portion 28 d. The pressing portion 28e is formed in a substantially plate shape with its plate surface facing substantially in the front-rear direction. The pressing portion 28e is fixed to the left end portion of the shaft portion 28 d. The pressing portion 28e abuts against an arm portion 62 of the lift operation device 40 (see fig. 14) described later from the rear.

The pivoting operation of the positioning lever 26 is transmitted to the arm 62 via the link mechanism 28 configured as described above. Specifically, when the lever main body 26a is rotationally operated, a rotational force acts on the plate 28c via the lever 28a and the arm portion 28 b. With this, the plate 28c, the shaft portion 28d, and the pressing portion 28e are rotated. When the pressing portion 28e is rotated clockwise in fig. 7 (a), the pressing portion 28e presses the arm portion 62 to rotate. When the pressing portion 28e is rotated in the opposite direction (counterclockwise direction) from the state in which it is rotated in the clockwise direction, the pressing portion 28e is separated from the arm portion 62. At this time, the arm portion 62 is rotated in the same direction as the pressing portion 28e so as to follow the pressing portion 28e by the biasing force of a spring (not shown) provided in the control valve. By rotating the arm 62 in this way, the positioning rod 26 can rotate the valve shaft S and raise and lower the hydraulic lift device 5. The positioning rod 26 is held at an arbitrary position by a friction plate (not shown) that generates a frictional force. Thus, the positioning rod 26 can adjust the height position of the hydraulic lift device 5.

The structure of the lift operation device 40 will be described below with reference to fig. 5, 8 to 14. As described above, the lift operation device 40 is used to switch the hydraulic lift device 5 to either of the raised position and the lowered position with a simple operation.

Here, the tractor 1 raises the hydraulic pressure elevating device 5 to raise the rotary tilling device 12 from the ground surface before turning around on the field or the like, and lowers the hydraulic pressure elevating device 5 to return to the original position after turning around, thereby tilling by the rotary tilling device 12. If such lifting of the hydraulic lifting device 5 is performed by the positioning rod 26, the positioning rod 26 having a larger operation amount (stroke) in the turning operation needs to be operated, which makes the operation complicated. On the other hand, if the elevation operation device 40 is used, the hydraulic elevation device 5 can be raised or lowered by a simple operation, and the operation at the time of swiveling can be easily performed. The structure of the lift operation device 40 will be specifically described below.

As shown in fig. 8 to 10, the lift operation device 40 is configured to be supported and operable by a bracket B10 in the console cover 27. Fig. 10 is a left rear view of the lift operation device 40. The lift operation device 40 includes: the lifter 50, the transmission part 60, the coupling part 70, and the release button 80.

The up-down lever 50 is rotatable about a lever rotation shaft 52 described later. The lifter 50 is switched by a turning operation to a lowering operation position P1 indicated by a solid line in fig. 13 and a raising operation position P2 indicated by a two-dot chain line in fig. 13. Fig. 13 and fig. 15 (a) to be described later are views of the up-down operation device 40 viewed from the axial direction of the lever rotating shaft 52 (the direction of arrow Y shown in fig. 11).

The lowering operation position P1 is a position where the lifter 50 is operated to rotate counterclockwise in fig. 13. As will be described later, when the lift lever 50 is switched to the lowering operation position P1, the hydraulic lift device 5 can be switched to the lowering position.

The lift operation position P2 is a position where the lift lever 50 is operated to rotate clockwise in fig. 13. As will be described later, when the lift lever 50 is switched to the lift operation position P2, the hydraulic lift device 5 can be switched to the lift position.

The following describes the configurations of the lifter lever 50, the transmission unit 60, the coupling unit 70, and the release button 80 with reference to the state in which the lifter lever 50 is switched to the lowering operation position P1. As shown in fig. 11 to 13, the lifter 50 includes a main body 51 and a lever pivot shaft 52. Further, an arrow Y shown in fig. 11 indicates the axial direction of the lever rotating shaft 52. The first direction X1 is a direction perpendicular to the axial direction of the lever turning shaft 52 in a plan view, and more specifically, a direction from the left rear side to the right front side. The second direction X2 represents a direction opposite to the first direction X1. Fig. 12 is a view of the lift operation device 40 viewed from the second direction X2.

The main body 51 is a portion that can rotate about a lever rotating shaft 52 described later. The main body 51 includes: a swing portion 51a, a tube portion 51b, and an attachment portion 51 c.

The swing portion 51a is a portion that is rotated by the driver. The swing portion 51a is formed by fixing a plate-like member to an upper portion of a shaft-like member whose axial direction is directed in the vertical direction. A handle for a driver to hold is fixed to an upper end of the swing portion 51 a. Fig. 11 shows the lifter 50 cut off at an arrow a 2-a 2 (halfway portion of the swinging portion 51a) in fig. 12 for convenience of explanation.

The cylindrical portion 51b is a substantially cylindrical portion. The cylindrical portion 51b is disposed such that the axial direction thereof faces the horizontal direction. More specifically, the tube portion 51b is disposed such that the axial direction thereof extends in a direction (the direction of arrow Y shown in fig. 11) extending from the left front to the right rear. The lower end of the swing portion 51a is fixed to the cylindrical portion 51 b. The cylindrical portion 51b is rotatably supported by a lever rotating shaft 52 described later.

The attachment portion 51c is a portion to which a cable 61 of the transmission portion 60 described later is attached. The mounting portion 51c is formed in a substantially plate shape. The mounting portion 51c is fixed to the outer periphery of the tube portion 51b and extends substantially downward from the tube portion 51 b. The lifter 50 can be rotated counterclockwise until the mounting portion 51c abuts against a substantially plate-shaped rotation stopper B11 (see fig. 13) provided in the bracket B10.

The lever rotating shaft 52 is for rotatably supporting the main body 51. The lever turning shaft 52 is disposed so that the axial direction thereof is oriented in the same direction as the axial direction of the tube portion 51 b. The lever rotating shaft 52 is fixed to the bracket B10. A cylindrical portion 51b is fitted around the lever rotating shaft 52. Thus, the lifter lever 50 is provided to be capable of being rotated about the lever rotating shaft 52.

The lift lever 50 configured as described above is disposed on the upper surface of the console cover 27 (see fig. 5 (a)). Specifically, the lift lever 50 is provided such that the upper portion of the main body portion 51 (the swing portion 51a) extends upward from the console cover 27 and is rotatable by the driver.

As shown in fig. 8, 9, 13, and 14, the transmission unit 60 is a portion for transmitting the rotational operation of the lifter lever 50 to the valve shaft S. The transmission unit 60 includes a cable 61 and an arm 62.

The cable 61 connects the lifter 50 to an arm 62 described later. The upper end of the cable 61 is attached to the attachment portion 51c of the lifter 50 and the lower end is attached to the arm portion 62 via the pin 61 a.

The arm 62 is used to rotate the valve shaft S. The arm portion 62 is disposed on the left side of the shaft portion 28d of the positioning rod 26 (see fig. 7 b). As shown in fig. 9 (b) and 14, the arm portion 62 includes a rotating portion 62a and a plate 62 b. In fig. 14 and fig. 15 (b) and 18 described later, for convenience of explanation, only the pressing portion 28e of the positioning rod 26 is described, and the plate 28c and the like are omitted.

The rotating portion 62a is a portion formed in a substantially cylindrical shape. The rotating portion 62a is disposed such that the axial direction thereof faces the left-right direction. The rotating portion 62a is connected to the valve shaft S. The rotating portion 62a is provided so as to be rotatable integrally with the valve shaft S about the axial center.

The plate 62b is formed in a substantially plate shape with the plate surface facing in the left-right direction. The plate 62b is formed in a substantially V shape having a portion extending forward and upward from the rear portion and a portion extending forward and downward from the rear portion in side view. The rear portion of the plate 62b is fixed to the right end portion of the rotating portion 62 a. The plate 62b abuts against the pressing portion 28 e. The plate 62b has a long hole 62 c.

The long hole 62c is formed at the front lower portion of the plate 62 b. The long holes 62c penetrate the plate 62b in the right and left directions. The elongated hole 62c is formed in a substantially arc shape centered on the turning portion 62a in a side view. A pin 61a of the cable 61 is inserted into the elongated hole 62 c.

The arm portion 62 is biased in the counterclockwise direction Z1 in fig. 14 by a spring (not shown) provided in the control valve. The cable 61 is pulled rearward and downward by this biasing force, and the lifter lever 50 is biased counterclockwise in fig. 13 (toward the lowering operation position P1).

The link 70 shown in fig. 10 and 11 is a portion for operating the lifter 50 in response to an operation of a release button 80 described later. The connection unit 70 includes: a main body plate 71, a link rotation shaft 72, and a spring 73.

The main body plate 71 is formed in a substantially plate shape with a plate surface facing in the vertical direction. The main body plate 71 is formed in a V-shape having a portion (engagement portion 71c) extending rightward and forward (first direction X1) from the rear portion (insertion portion 71a) and a portion (connection portion 71b) extending substantially forward from the rear portion in a plan view. The main body plate 71 is rotatably attached to a bracket B10 via a link rotation shaft 72 described later. The main body plate 71 is disposed at a position higher than the lever rotating shaft 52. The main body plate 71 includes: an insertion portion 71a, a connection portion 71b, and an engagement portion 71 c.

The insertion portion 71a is a portion through which the contact rotation shaft 72 is inserted. The connection portion 71b is a portion connected to the release button 80.

The engaging portion 71c is a portion that engages with the lifter 50. The engaging portion 71c includes a permission portion 71d and a restriction portion 71 e.

The allowing portion 71d is a portion that allows the turning operation of the lifter 50. The allowing portion 71d is formed by an end surface (a surface facing the lateral direction) of the engaging portion 71 c. The allowing portion 71d is formed substantially linearly in a plan view. The allowable portion 71d is formed to be inclined with respect to the first direction X1 in a plan view. More specifically, the allowing portion 71d extends rightward as it goes toward the first direction X1. The allowing portion 71d abuts against the swinging portion 51a from the rear.

The restricting portion 71e is a portion that restricts the rotational operation of the lifter lever 50. The restricting portion 71e is formed by an end surface of the engaging portion 71 c. The restriction portion 71e is formed substantially linearly in a plan view. The restriction portion 71e is formed continuously with the left rear end portion of the allowing portion 71 d. The restriction portion 71e is formed to extend in substantially the same direction as the axial direction of the lever turning shaft 52 (the direction orthogonal to the second direction X2 in a plan view), and is formed to face the second direction X2. The restricting portion 71e abuts on the swinging portion 51a when the lift lever 50 is switched to the lift operation position P2 (see fig. 16 b).

The main body plate 71 is rotatably supported by the link rotation shaft 72. The linking rotary shaft 72 is disposed such that the axial direction thereof is oriented in the vertical direction. The link rotating shaft 72 is inserted through the bracket B10 and the insertion portion 71a of the main body plate 71. The linking pivot shaft 72 is disposed on the left rear side of the lifter 50 (on a substantially extended line of the direction in which the lifter 50 is pivoted (the second direction X2) in plan view). The linking rotary shaft 72 is constituted by a bolt for attaching the main body plate 71 to the bracket B10.

The spring 73 biases the main body plate 71. The spring 73 is constituted by a torsion spring. The spring 73 is externally fitted to the link rotating shaft 72. One end of the spring 73 is attached to the bracket B10. The other end of the spring 73 is hooked to the engaging portion 71c of the main body plate 71. The spring 73 biases the main body plate 71 counterclockwise in fig. 11.

As shown in fig. 12, when the vertically movable operation device 40 is viewed from the second direction X2, the main body plate 71 of the linking part 70 configured as described above is disposed so as to extend from one side in the axial direction of the lever rotating shaft 52 to the other side (left and right in the drawing) with respect to the swinging part 51a of the vertically movable lever 50.

The release button 80 shown in fig. 10 and 11 is pushed in to switch the hydraulic lift device 5 to the lowered position. The release button 80 is disposed on the left side of the connection portion 71 b. The release button 80 includes a body 81 and a shaft 82.

The main body 81 is a portion for the driver to perform a press-fitting operation. The body 81 includes an operation surface 81a and a flange 81 b. The operation surface 81a is a surface for the driver to push in. The operation surface 81a is arranged facing leftward.

The flange 81b is formed at the right end of the body 81. The flange 81b is formed to have the largest outer diameter in the body 81.

The shaft portion 82 is a shaft-like portion connecting the body portion 81 and the coupling portion 71 b. The shaft portion 82 is formed in a substantially L shape having a portion extending in the left-right direction and a portion extending upward from the right end portion. The left end of the shaft 82 is attached to the body 81, and the upper end is attached to the coupling portion 71 b. The shaft portion 82 is supported by the bracket B10 so as to be slidable in the left-right direction. In this way, the release button 80 is provided so that the driver can perform a pushing operation in the right direction (a direction that is not parallel and not perpendicular to the lever turning shaft 52).

As shown in fig. 12, when the elevation operation device 40 is viewed from the second direction X2, the release button 80 is disposed so as not to overlap the elevation lever 50. More specifically, the release button 80 is disposed leftward (one side in the axial direction of the lever turning shaft 52) with respect to the swing portion 51a of the lifter lever 50.

As shown in fig. 5, the release button 80 configured as described above is disposed on the left side surface of the console cover 27. More specifically, the release button 80 is disposed in the through hole 27a of the console cover 27, and the operation surface 81a is disposed so as to be exposed from the left side surface of the console cover 27. The operation surface 81a is disposed to slightly protrude from the left side surface of the console cover 27. In this way, the operation surface 81a is disposed near the lift lever 50 (the swing portion 51a) disposed on the upper surface of the console cover 27. When the release button 80 is not pushed, the flange portion 81b abuts the inner surface of the console cover 27 from the left. Thus, the flange portion 81b functions as a release prevention member for preventing the release button 80 from coming off the console cover 27.

The lift operation device 40 configured as described above can switch the hydraulic lift device 5 to the raised position by switching the lift lever 50 from the lowering operation position P1 to the raised operation position P2 shown in fig. 13. Further, by pushing the release button 80, the lift lever 50 can be switched from the upward operation position P2 to the downward operation position P1, and the hydraulic lift device 5 can be switched to the downward position. The lift operation device 40 can raise and lower the hydraulic lift device 5 by rotating the valve shaft S in response to switching of the lift lever 50. Hereinafter, a specific description will be given with reference to fig. 14 to 18.

In fig. 16 and 17, only the swing portion 51a is shown in the lifter 50. In addition, hereinafter, a state in which the positioning rod 26 is rotated forward and the hydraulic lift device 5 is lowered to a predetermined height (lowered position) is referred to as an initial state.

First, the operation of the lift operation device 40 when switching from the lowering operation position P1 to the raising operation position P2 will be described. As shown in fig. 15 (a) and 16, when the up-down lever 50 is switched to the up-down operation position P2, it is rotated clockwise in fig. 15 (a) about the lever rotation shaft 52. Accordingly, the swing portion 51a moves in the second direction X2 in a plan view, and presses against the allowing portion 71d of the main body plate 71. Here, since the allowing portion 71d is formed in a substantially linear shape inclined with respect to the second direction X2 in a plan view, the swinging portion 51a can rotate the allowing portion 71d (the main body plate 71) while sliding with respect to the allowing portion 71 d. Thus, the allowing portion 71d allows the pivotal operation of the lifter 50 toward the lift operation position P2 without interfering with the movement of the swing portion 51 a.

As shown in fig. 16 (b), when the lift lever 50 is pivotally operated to the lift operation position P2, the rocking section 51a (the contact portion with the engagement section 71c) is disposed on the second direction X2 side with respect to the allowable section 71d, and therefore the contact state with the allowable section 71d is released. Then, the main body plate 71 is rotated counterclockwise in fig. 16 (b) by the biasing force of the spring 73, and the restriction portion 71e is disposed on the first direction X1 side of the swing portion 51 a.

As described above, the lift lever 50 is biased counterclockwise (toward the lowering operation position P1) in fig. 15 a by the spring of the control valve. Therefore, when the turning operation of the lifter lever 50 is released in the state shown in fig. 16 (b), the swinging portion 51a is biased in the first direction X1 in a plan view. At this time, the swing portion 51a abuts on the restriction portion 71e, and presses the restriction portion 71e in the first direction X1. However, since the pressing does not apply a rotational force to the main body plate 71, the main body plate 71 does not rotate. Thus, the swing portion 51a engages with the restricting portion 71e, and the lifter lever 50 is held at the lift operation position P2.

In the switching to the raising operation position P2, the attachment portion 51c is rotated by a predetermined angle clockwise in fig. 15 (a). With this, the cable 61 is pulled substantially upward, and the plate 62b of the arm portion 62 is pulled forward upward. Thereby, the arm portion 62 rotates in the clockwise direction Z2 in fig. 15 (b). The valve shaft S rotates due to the rotation, and the hydraulic elevating device 5 is switched to the upward position.

Further, the arm portion 62 is separated from the pressing portion 28e of the link mechanism 28 when rotated. In this way, the lift operation device 40 rotates the arm portion 62 relative to the pressing portion 28e, so that the rotational operation of the lift lever 50 does not affect the positioning rod 26 (the operation position does not change).

Next, the operation of the lift operation device 40 when switching from the lift operation position P2 to the lower operation position P1 will be described. As shown in fig. 17, when the operation surface 81a is pushed rightward, the release button 80 pushes the coupling portion 71b rightward via the shaft portion 82. Thereby, the main body plate 71 is rotated clockwise against the urging force of the spring 73. Accordingly, the restricting portion 71e is separated from the swing portion 51a, and the engagement with the swing portion 51a is released.

As described above, since the valve shaft S is biased by the spring of the control valve, when the engagement state of the swing portion 51a and the restriction portion 71e is released, the valve shaft S rotates in the counterclockwise direction Z1 shown in fig. 14. Accordingly, the arm 62 rotates in the same direction as the valve shaft S and comes into contact with the pressing portion 28e of the positioning rod 26. Thus, the valve shaft S is rotated by a predetermined angle, and the hydraulic lift device 5 returns to the height position (lowered position) set by the positioning rod 26.

At this time, the mounting portion 51c is pulled rearward and downward via the cable 61, and the lifter 50 rotates by a predetermined angle counterclockwise in (a) of fig. 15. Thus, the lifter lever 50 is held at the lowering operation position P1 (see fig. 15 a).

As described above, in the present embodiment, the hydraulic elevating device 5 is switched to the ascending position by the elevating lever 50, and the hydraulic elevating device 5 is switched to the descending position by the release button 80. In this way, by switching between the raised position and the lowered position using two different operation tools, the operation of switching the hydraulic lifting device 5 between the raised position and the lowered position can be easily distinguished from each other by the difference in the operation tools. This makes it possible to clarify the switching operation between the raised position and the lowered position, thereby improving operability.

In the present embodiment, the release button 80 is disposed on the left side (left and right inner sides) of the swing portion 51 a. This makes it easy to press the release button 80 with the thumb while gripping the swing portion 51a (handle) of the lifter lever 50. The release button 80 is configured to be pressed in a right direction, that is, in a direction that is not parallel to and perpendicular to the axial direction of the lever rotating shaft 52. With this configuration, the direction in which the release button 80 is pushed in with respect to the axial direction of the lever rotating shaft 52 is at an appropriate angle. This makes it easy to press the release button 80 while holding the swing portion 51a, and thus, operability can be effectively improved.

In the present embodiment, the lift lever 50 is disposed on the upper surface of the console cover 27, and the release button 80 is disposed on the left side surface of the console cover 27. With this configuration, the up-down lever 50 and the release button 80 can be distinguished from each other based on the arrangement with respect to the console cover 27, and therefore, the switching operation between the raised position and the lowered position can be further clarified.

Here, the positioning rod 26 and the lift operation device 40 both rotate the valve shaft S and raise and lower the hydraulic lift device 5. As described above, the arm portion 62 of the lift operation device 40 rotates relative to the pressing portion 28e, so that the rotation operation of the lift lever 50 does not affect the positioning rod 26.

The elevation operation device 40 prevents the elevation lever 50 from being affected by the pivotal operation of the positioning rod 26 through the elongated hole 62 c. Hereinafter, the following description will be specifically made.

As described above, the pressing portion 28e rotates in accordance with the rotating operation of the positioning rod 26. In the state shown in fig. 14, when the pressing portion 28e rotates in the clockwise direction Z2, the arm portion 62 is pressed by the pressing portion 28e and rotates. At this time, as shown in fig. 18, the pin 61a of the cable 61 slides with respect to the long hole 62c of the arm portion 62. When the pressing portion 28e is rotated counterclockwise from the state shown in fig. 18, the arm portion 62 is rotated in the same direction as the pressing portion 28e by the biasing force of the spring that controls the valve. At this time, the pin 61a slides with respect to the long hole 62 c.

By providing the elongated hole 62c in the arm portion 62 in this way, the cable 61 is prevented from being pulled by the turning operation of the positioning lever 26, and the turning operation of the positioning lever 26 does not affect the up-down lever 50.

As described above, the lift operation device 40 (operation device) of the tractor 1 (work vehicle) according to the present embodiment is the lift operation device 40 of the tractor 1 capable of switching the hydraulic lift device 5 to either of the raised position and the lowered position, and includes: a lift lever 50 (first operating means) which is capable of being operated to pivot about a lever pivot shaft 52 (first pivot shaft) and which is capable of switching the hydraulic lift device 5 to either the raised position or the lowered position by being operated to pivot; and a release button 80 (second operation tool) that allows the release button 80 to be pushed in, and that allows the hydraulic lifting device 5 to be switched to the other of the raised position and the lowered position by being pushed in.

In this way, by sharing the operation for switching the position of the hydraulic lifting device 5 with two operation tools (the lifting lever 50 and the release button 80), the operation tool used in accordance with the operation can be made clear, and the operability can be improved.

The lift lever 50 is configured to be pivotally operated to a lift operation position P2 (first operation position) and a lower operation position P1 (second operation position) and biased toward the lower operation position P1, the hydraulic lift device 5 is configured to be switchable to the lift position at the lift operation position P2, the hydraulic lift device 5 is configured to be switchable to the lower operation position at the lower operation position P1, and the lift operation device 40 of the tractor 1 further includes a link 70, the link 70 is configured to be capable of holding the lift lever 50 at the lift operation position P2, and the holding of the lift lever 50 is configured to be capable of being released based on the operation of the release button 80.

By configuring in this way, the coupling portion 70 couples the lifter lever 50 and the release button 80, so that the operating mechanism (the transmission portion 60 in the present embodiment) of the hydraulic lifter device 5 can be shared by the lifter lever 50 and the release button 80. This can simplify the elevation operation device 40.

Further, the connection portion 70 includes: an engaging portion 71c that engages with the lift lever 50 to restrict the rotational operation of the lift lever 50 from the lift operation position P2 to the lower operation position P1; and a connecting portion 71b connected to the release button 80, wherein the connecting portion 70 is configured to be rotatable about a connecting rotation shaft 72 (second rotation shaft) based on an operation of the release button 80, and thereby to be able to release the engagement between the lift lever 50 and the engaging portion 71 c.

By configuring in this manner, the lifter lever 50 and the release button 80 can be easily linked by the rotation of the linking portion 70, and the lifter operating device 40 can be simplified.

The engaging portion 71c allows the pivotal operation of the lifter 50 from the lowering operation position P1 to the raising operation position P2.

By configuring in this manner, the operability of the lifter lever 50 can be improved. That is, since the turning operation of the lifter 50 from the ascent operation position P2 to the descent operation position P1 is restricted and the turning operation from the descent operation position P1 to the ascent operation position P2 can be more allowed, the lifter 50 can be simply turned to the ascent operation position P2.

In addition, the coupling portion 70 is disposed to extend from one side to the other side of the lifter 50 in the axial direction of the lever rotating shaft 52 of the lifter 50.

By configuring in this manner, the coupling portion 70 can be prevented from protruding greatly to one side or the other side in the axial direction of the lever rotating shaft 52 with respect to the lifter 50, and therefore, the lifter operating device 40 can be made compact.

The release button 80 is disposed on one side of the lifter 50 in the axial direction of the lever rotating shaft 52 of the lifter 50.

In this configuration, the release button 80 that can be pushed in is disposed offset from the axial direction of the lever rotating shaft 52 with respect to the lifter lever 50 that can be rotationally operated. According to this configuration, for example, the lift lever 50 and the release button 80 can be easily operated with one hand by operating the release button 80 with another finger while holding the lift lever 50, and operability can be improved.

The release button 80 can be pushed in a direction (rightward) that is not parallel to and perpendicular to the lever rotating shaft 52 of the lifter lever 50.

With this configuration, the release button 80 can be disposed so that the direction of pushing operation of the release button 80 forms an appropriate angle with respect to the axial direction of the lever rotating shaft 52. This makes it easy to operate the lifter lever 50 and the release button 80 with one hand, and improves operability.

The lift lever 50 is disposed on the upper surface of the console cover 27, the console cover 27 is disposed on the side of the seat 22, and the release button 80 is disposed on the side surface of the console cover 27.

With this configuration, the lifter 50 and the release button 80 are disposed on different side surfaces (upper surface and side surfaces) of the console cover 27. This makes it easier to distinguish between the switching to the raised position (the up-down lever 50) and the switching to the lowered position (the release button 80), and improves operability.

In addition, the release button 80 is disposed so that at least a part thereof is located inside the side surface of the console cover 27.

With this configuration, the release button 80 is less likely to protrude from the side surface of the console cover 27, and thus inadvertent contact with the release button 80 can be suppressed.

The up-down lever 50 is pivotally operable about the lever pivot shaft 52 extending from the left-right inner front side to the left-right outer rear side (in the direction of arrow Y shown in fig. 11), and the release button 80 is press-operable in the left-right direction.

With this configuration, the arrangement in which the lifter lever 50 and the release button 80 are easily operated by the driver seated in the seat 22 can be provided, and thus the operability can be improved.

The tractor 1 according to the present embodiment is an embodiment of the work vehicle according to the present invention.

The up-down operation device 40 according to the present embodiment is an embodiment of the operation device of the present invention.

The lever rotating shaft 52 according to the present embodiment is an embodiment of the first rotating shaft according to the present invention.

The lifter 50 according to the present embodiment is an embodiment of the first operation tool of the present invention.

The release button 80 of the present embodiment is an embodiment of the second operation tool of the present invention.

The lift operation position P2 according to the present embodiment is an embodiment of the first operation position of the present invention.

The lowering operation position P1 according to the present embodiment is an embodiment of the second operation position of the present invention.

The contact turning shaft 72 of the present embodiment is an embodiment of the second turning shaft of the present invention.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention described in the claims.

For example, the work vehicle of the present embodiment is the tractor 1, but the type of the work vehicle of the present invention is not limited to this.

The utility model discloses a working vehicle can be other agricultural vehicles, construction vehicle, industrial vehicle etc..

In the present embodiment, the switching of the upward position of the hydraulic elevating device 5 is performed by the elevating lever 50, and the switching of the downward position of the hydraulic elevating device 5 is performed by the release button 80, but the relationship between the switching of the upward position and the downward position and the operation of the elevating lever 50 and the release button 80 is not limited thereto, and any relationship may be used. For example, the hydraulic lifting device 5 is switched to the raised position by the release button 80, and the hydraulic lifting device 5 is switched to the lowered position by the lifting lever 50.

In the present embodiment, the coupling portion 70 rotates in response to the pushing operation of the release button 80, but the present invention is not limited thereto. The contact portion 70 may slide in response to, for example, a press-in operation of the release button 80.

In the present embodiment, the lifter 50 and the release button 80 are linked by the linking portion 70, but the present invention is not limited thereto, and the lifter 50 and the release button 80 may not be linked. In this case, the lifter 50 and the release button 80 may be connected to the valve shaft S through different transmission portions.

In the present embodiment, the lift lever 50 is disposed on the upper surface of the console cover 27, but the position where the lift lever 50 is disposed is not limited thereto, and may be disposed at any position. For example, the lift lever 50 may be disposed on the left side surface of the console cover 27.

The axial direction of the lever turning shaft 52 is not limited to the direction extending from the front left to the rear right (the direction of arrow Y shown in fig. 11) as in the present embodiment, and may be any direction.

In the present embodiment, the release button 80 is disposed on the left side surface of the console cover 27, but the position where the release button 80 is disposed is not limited thereto, and may be disposed at any position. For example, the release button 80 may be disposed on the upper surface of the console cover 27.

In the present embodiment, the operation surface 81a of the release button 80 slightly protrudes from the left side surface of the console cover 27 to the left and right outside, but the present invention is not limited thereto, and for example, the operation surface 81a may be disposed flush with the left side surface of the console cover 27. The operation surface 81a may be disposed inside the left side surface of the console cover 27. In this way, the operation surface 81a does not protrude from the left side surface of the console cover 27 (the entire operation surface is housed in the console cover 27), and thus the operation surface 81a can be effectively prevented from being inadvertently touched.

In the present embodiment, the release button 80 is provided so as to be capable of being pushed in to the right direction, but the pushing direction of the release button 80 is not limited thereto, and may be any direction. The pushing direction of the release button 80 is a direction that is not parallel to and perpendicular to the axial direction of the lever turning shaft 52, but this is merely an example, and the relationship with the axial direction of the lever turning shaft 52 is not limited to this. The pushing direction of the release button 80 may be parallel to the axial direction of the lever turning shaft 52 or perpendicular to the axial direction of the lever turning shaft 52, for example.

Claims (10)

1. An operation device for a working vehicle, capable of switching a hydraulic lifting device to either a lifting position or a lowering position, comprising:

a first operating tool that can be rotationally operated about a first rotational axis and that can switch the hydraulic lift device to either the raised position or the lowered position by being rotationally operated; and

and a second operation tool that can be press-fitted and can switch the hydraulic lifting device to the other of the raised position and the lowered position by being press-fitted.

2. The operating device of a work vehicle according to claim 1,

the first operating tool is capable of being rotationally operated to a first operating position in which the hydraulic lifting device is capable of being switched to the raised position and a second operating position in which the hydraulic lifting device is capable of being switched to the lowered position, and is biased toward the second operating position,

the operation device for a work vehicle further includes a linking unit that is capable of holding the first operation tool at the first operation position and releasing the holding of the first operation tool based on an operation of the second operation tool.

3. The operating device of a work vehicle according to claim 2,

the contact unit includes:

an engaging portion that is engaged with the first operating tool to restrict a rotational operation of the first operating tool from the first operating position to the second operating position; and

a connection part connected to the second operation tool,

the coupling portion is configured to be rotatable about a second rotation axis based on an operation of the second operating tool, and thereby to be capable of releasing engagement between the first operating tool and the engagement portion.

4. The operating device of a work vehicle according to claim 3,

the engagement portion allows a rotational operation of the first operating tool from the second operating position to the first operating position.

5. The operating device for working vehicle according to any one of claims 2 to 4,

the coupling portion is arranged to extend from one side to the other side of the first operating tool in an axial direction of the first rotating shaft of the first operating tool.

6. The operating device for working vehicle according to any one of claims 1 to 4,

the second operating tool is disposed on one side of the first operating tool in an axial direction of the first rotating shaft of the first operating tool.

7. The operating device for working vehicle according to any one of claims 1 to 4,

the second operating tool can be press-fitted in a direction that is not parallel to and perpendicular to the first rotation axis of the first operating tool.

8. The operating device for working vehicle according to any one of claims 1 to 4,

the first operating tool is arranged on the upper surface of a console cover, the console cover is arranged on the side of the seat,

the second operating tool is disposed on a side surface of the console cover.

9. The operating device of a work vehicle according to claim 8,

the second operating tool is configured such that at least a part thereof is located inside compared with a side surface of the console cover.

10. The operating device of a work vehicle according to claim 8,

the first operating tool is capable of being operated by rotation around the first rotating shaft extending from the front of the left and right inner sides to the rear of the left and right outer sides,

the second operation tool can be press-fitted in the right-left direction.

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