JP2000072048A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an operating lever from abutting an operator's seat even in the case of tilting up an operator's cabin. SOLUTION: A working vehicle has a turning table 11 provided in a turnable state on a travel device; an operator's cabin 15 provided in an upward tiltable state on the turning table 11; an operating lever 19 provided in the operator's cabin so as to be swingingly operated in the same direction as a tilt-up direction and operated by a worker; and a link 49 for connecting the base part of the operating lever 19 to a control valve 57 provided at the turning table 11 so as to transmit the operation of the operating lever 19 to the control valve 57. The tilt-up rocking center of the operator's cabin 15 is coaxial with a pivotal connection part 49d of the link 49 to be the rocking center of the operating lever 19. When the operator's cabin 15 is tilted up, an operator's seat 17 in the operator's cabin 15 is tilted up, and the operating lever 19 is tilted up in the connected state to the control valve 57 without abutting the operator's seat 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle, and more particularly, to a work vehicle having a tilt type cab.

[0002]

2. Description of the Related Art When excavating the ground or moving excavated soil or the like, for example, a backhoe having a bucket and a blade pivotally supported at the tip end of an arm is used. The backhoe includes a traveling vehicle provided with a traveling device having a pair of left and right crawler tracks, a blade swingably provided at a rear portion of the traveling vehicle, a swivel pivotally provided on the traveling vehicle, It has a power shovel mechanism pivotally supported at the front of the table, and an operator cabin provided at the top of the swivel table so as to be tiltable up.

[0005] In the operator cabin 15, FIG.
As shown in (a), the bottom plate 4 of the operator cabin 15
An operator seat 17 is provided on the upper part of the operator seat 5. An operation lever 19 for operating left and right crawler belts is provided in front of the operator seat 17.
9 is connected to a lever shaft 47 provided on the swivel 11 through the bottom plate 45. A connecting rod 55 is connected to the lever shaft 47 via a joint 53, and a control valve 57 is connected to a distal end of the connecting rod 55. Therefore, when the operating lever 19 is swung in the same direction as the tilt-up direction of the operator cabin 15, the connecting rod 55 via the lever shaft 47 moves in the same direction as the tilt-up direction, and the control valve 57 is actuated. Is controlled to change the running speed of the vehicle.

[0004] The distal end of the bottom plate 45 of the operator cabin 15 is rotatably supported by the distal end of the swivel table 11.
When the maintenance of the control valve 57 and the like provided on the swivel base 11 is performed, the tip of the operator cabin 15 is tilted up around the swing center as shown in FIG. To expose.

[0005]

However, when the tip of the bottom plate of the operator cabin is tilted up around the swing center, the operator seat is tilted up toward the front of the vehicle with the tip of the bottom plate of the operator cabin swing center. However, since the operation lever is fixed to the swivel table, the operation lever comes into contact with the leading end of the operator seat, and moves in the same direction as the direction in which the operator cabin tilts up. Therefore, if the engine of the vehicle is driven while the operation lever is moved, the vehicle may run.

Therefore, a shut-off mechanism for cutting off the connection between the operating lever and the connecting rod so that the vehicle does not run when the operator seat is tilted up can be provided. However, when the shutoff mechanism is provided, there is a problem that the maintenance of the engine, the control valve, and the like accompanying the operation of the operation lever may not be sufficiently performed.

The present invention has been made in view of such a problem, and when the operator cabin is tilted up, the operation lever does not come into contact with the operator seat and the engine cabin is tilted up. An object of the present invention is to provide a work vehicle that can perform maintenance sufficiently.

[0008]

In order to solve the above-mentioned problems, a work vehicle (for example, the backhoe 1 in the embodiment) of the present invention is a vehicle having a traveling device (for example, the traveling vehicle 7 in the embodiment, the swivel platform). 11), a driver's cab (for example, the operator cabin 15 in the embodiment) provided on the chassis so as to be tiltable, and provided on the driver's cab so as to be swingable in the same direction as the tilt-up direction and operated by an operator. It has an operation lever, and a link mechanism that connects a base of the operation lever and a control device (for example, the controller valve 57 in the embodiment) provided on the chassis and transmits operation of the operation lever to the control device. Then, the pivot center of the tilt-up of the cab and the pivotal connection point of the link mechanism which is the pivot center of the operation lever are provided on the same axis.

In order to tilt the driver's cab to expose the upper portion of the chassis, after stopping the work vehicle, the driver's cab is tilted up to the front side of the vehicle with the swing center of the tilt-up as a fulcrum. Therefore, the bottom of the cab moves upward, so that the upper portion of the chassis is exposed. At the same time,
Since the operation lever tilts up about the pivot point of the link mechanism that is on the same axis as the tilt-up swing center, the operation is performed from a state where the operation lever is not operated (hereinafter, referred to as a “neutral state”). The lever does not move.
By operating the operation lever in the same direction as the tilt-up direction in the tilt-up state of the cab, the control device can be operated via the link mechanism. Therefore, maintenance of the work vehicle can be sufficiently performed.

The link has three rod-shaped members and two pivot points for connecting these rod-shaped members to each other so as to be rotatable.
One end of a rod-shaped member connected to the operating lever at the pivot point of the link mechanism disposed on the same axis as the tilt-up swing center, and the other end of the rod-shaped member connected to the rod-shaped member. It is preferable to connect By disposing the pivoting center of the cab tilt-up and the pivot point of the link mechanism, which is the pivot center of the operating lever, on the same axis, the operating lever, the control device and the control unit can be used even when the cab is tilted up. The operation lever can be tilted up while maintaining the connection state of. Therefore, the cab can be tilted up while maintaining the neutral state of the operation lever.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. This embodiment shows a mode of a backhoe used when excavating the ground or moving excavated soil or the like. As shown in FIG. 1, the backhoe 1 includes a traveling vehicle 7 including a traveling device 5 having a pair of left and right crawler tracks 3, a blade 9 provided at the rear of the traveling vehicle 7 so as to be swingable in a vertical direction, The vehicle has a swivel 11 provided rotatably on the traveling carriage 7, a power shovel mechanism 13 pivotally supported at the front of the swivel 11, and an operator cabin 15 provided at an upper part of the swivel 11. I have.

An operator seat 17 is provided in the operator cabin 15 on which the operator faces the power shovel mechanism 13. A rod-shaped operation lever 19 for operating the left and right crawler belts 3 is provided in the operator cabin 15 and closer to the power shovel mechanism 13 than the operator seat 17. A left operating lever 21a and a right operating lever 21b for controlling the operation of the power shovel mechanism 13 are provided on the left and right sides of the operator seat 17, and an instrument panel is provided on the right side of the operator seat 17 and closer to the blade 9 than the right operating lever 21b. 23 are provided.

A power shovel mechanism 13 is pivotally supported by a front portion of the swivel table 11 and is capable of swinging back and forth, and an arm 2 pivotally supported by the tip of the boom 25 and capable of swinging back and forth.
7 and a bucket 29 pivotally supported at the tip of an arm 27 so as to swing back and forth. A boom cylinder 31 is connected between the tip of the revolving base 11 and an intermediate part of the boom 25, and an arm cylinder 33 is connected between the intermediate part of the boom and the rear end of the arm. Also, the arm 27
A bucket cylinder 35 is connected between the rear end of the bucket and the base of the bucket 29. Therefore, by operating these cylinders 31, 33, 35, the boom 25, the arm 27, and the bucket 29 can be swung. The operation of these cylinders 31, 33, 35 is controlled by operating the left and right operation levers 21a, 21b.

The traveling device 5 has a traveling vehicle 7 having a substantially H shape, and traveling machines 37 provided at both left and right ends of the traveling vehicle 7. The traveling machine 37 includes a driving sprocket 39 provided at the front of the left and right ends of the traveling carriage 7,
A front idler (idle wheel, idled sprocket) 41 is provided at the rear of both left and right ends of the vehicle, and the crawler belt 3 is wound around and driven by these sprockets 39, 41. That is, the chassis is composed of the traveling device 5 and the swivel base 11.

As shown in FIG. 2A, a damper 43 is connected between the operator cabin 15 and the swivel base 11. An operator seat 17 is provided above the bottom plate 45 of the operator cabin 15, and the base of the operation lever 19 provided forward of the operator seat 17 is the tip of the bottom plate 45 and extends in the width direction of the vehicle. Connected to a lever shaft 47. One end of a link 49 is connected to a lower portion of the lever shaft 47, and the other end is connected to a rod 51 provided at a tip end of the swivel 11 and extending in the width direction of the vehicle.

The link 49 has three rod-like members 49a, 49
b, 49c and adjacent rod-like members 49a, 49b, 49c
It has pivoting portions 49d and 49e that rotatably connect the spaces therebetween. The bar-shaped member 49a connected to the lever shaft 47 has an inverted L-shape, and the bar-shaped member 49b connected to the bar-shaped member 49a has an arc shape. A connecting rod 55 is connected to the rod 51 via a joint 53, and a control valve 57 is connected to a distal end of the connecting rod 55. Therefore, as shown in FIG.
When the vehicle 9 is swung in the front-rear direction of the vehicle, the link 49, the rod 51, and the connecting rod 55 via the joint 53 move in the front-rear direction of the vehicle, thereby controlling the operation of the control valve 57 to reduce the traveling speed of the vehicle. Can be changed.

The distal end of the bottom plate 45 and the distal end of the swivel base 11 are connected by a rotating shaft (not shown) extending in the width direction of the vehicle, and the operator cabin 15 is tilted up about this rotating shaft. I do. The center axis of the rotation shaft is arranged on the same axis as the center axis of the connecting portion 49d of the link 49 when the operation lever 19 is in a neutral state (a state where the operation lever 19 is not operated).

Next, the backhoe 1 which is the working vehicle of the present invention will be described.
3 will be described with reference to FIGS. 3 and 4. FIG. As shown in FIG. 3A, when performing maintenance on the backhoe 1, the backhoe 1 is stopped, and the
After being placed on the ground G, the operator cabin 15 is tilted up to expose the upper part of the swivel base 11 as shown in FIG. That is, as shown in FIG. 4, when the rear portion of the operator cabin 15 is pulled upward, the operator cabin tilts up in the direction of arrow A about the rotation axis. When tilting up,
The rear portion of the operator cabin 15 can be easily pulled upward by the action of the damper 43. At the same time, the operation lever 19 tilts up in the direction of arrow A about the pivot 49d connecting the inverted L-shaped bar 49a of the link 49 and the arc bar 49b.

That is, when the operator cabin 15 is tilted up, the operation lever 19 and the operator cabin 15
The operator lever 17 does not come into contact with the operator seat 17 because the operator lever 17 is tilted up on the same axis as the rotation axis as a fulcrum. Further, in a state where the operator cabin 15 is tilted up, the operation lever 19 is in a neutral state without abutting against the operator seat 17, so that the vehicle runs without permission even when the engine (not shown) of the vehicle is driven. Never. Further, even when the operator cabin 15 is tilted up, since the operation lever 19 is connected to the control valve 57 via the link 49 or the like, maintenance of the vehicle including the operation of the control valve 57 connected to the operation lever 19 can be performed. Can do it.

[0020]

As described above, according to the present invention,
By arranging the pivot center of the cab tilt-up swing and the pivot point of the link mechanism which is the swing center of the operation lever on the same axis, the operation lever also tilts up even if the cab is tilted up. Therefore, the operation lever does not come into contact with another object and the neutral state is maintained, so that the vehicle does not move on its own. In the tilted cab, the operation lever is connected to the control device via the link mechanism while maintaining the neutral state, so that the control device is operated by operating the operation lever in the same direction as the tilt-up direction. Can be operated. Therefore, maintenance of the work vehicle can be sufficiently performed.

Further, the link has three rod-shaped members and two pivotal connecting points for rotatably connecting these rod-shaped members to each other, and is provided on the same axis as the tilt-up swing center. When pivotally connecting one end of the rod-shaped member connected to the operation lever at the pivot point of the mechanism and the other end of the rod-shaped member connected to this rod-shaped member, the driver's cab may be tilted up. The operation lever can be tilted up while maintaining the connection state between the operation lever and the control device. Therefore, the cab can be tilted up while maintaining the neutral state of the operation lever, and maintenance of the work vehicle can be performed with the cab tilted up.

[Brief description of the drawings]

FIG. 1 shows a perspective view of a backhoe according to the present invention.

FIGS. 2A and 2B show the inside of an operator cabin of the backhoe according to the present invention. FIG. 2A shows a front view of a main part in the operator cabin, and FIG. 2B shows a front view for explaining the operation of an operation lever. Show.

3A and 3B show a backhoe according to the present invention, wherein FIG. 3A shows a front view of the backhoe in a stopped state, and FIG. 3B shows a front view when the backhoe is maintained.

FIG. 4 is a front view for explaining the operation of the backhoe according to the present invention.

5A and 5B show the inside of an operator cabin according to the prior art; FIG. 5A shows a front view when the operator cabin of the backhoe is mounted on a swivel table; FIG. The front view of the principal part of the operator cabin when pulled up is shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Backhoe 5 Traveling device 7 Traveling trolley (carriage) 11 Turning table (carriage) 15 Operator cabin (driving cab) 19 Operating lever 49 Link 49a, 49b, 49c Rod-shaped member 49d, 49e Connecting part 57 Controller valve (Control device)

Claims (2)

[Claims] An undercarriage provided with a traveling device, a cab provided on the undercarriage so as to be tiltable, and a cab provided on the cab so as to be swingable in the same direction as the tilt-up direction and operated by an operator. An operating lever, and a link mechanism for connecting a base of the operating lever and a control device provided in the chassis, and transmitting a manipulation of the operating lever to the control device. A work vehicle, wherein a pivot point of the link mechanism, which is a pivot center and a pivot center of the operation lever, is provided on the same axis. 2. The link mechanism has three rod-shaped members and two pivotal connecting points for rotatably connecting these rod-shaped members to each other, and is arranged on the same axis as the tilt-up swing center. At the pivot point of the provided link mechanism, one end of the rod-shaped member connected to the operation lever and the other end of the rod-shaped member connected to the rod-shaped member are pivotally connected. The work vehicle according to claim 1, wherein