JPH0571255U - Backhoe valve operation structure - Google Patents

Abstract

(57) [Abstract] [Purpose] In the valve operation structure of the backhoe, the operation pattern switching operation can be performed without the troublesome work such as using a dedicated tool. [Structure] An operating lever 12L is provided which is capable of swinging in a cross motion in the front-rear and left-right directions, and the first hydraulic control valve V1 is operated by operating the operation lever 12L in the front-rear direction, and the second hydraulic pressure is operated by operating the left-right direction. A first operation state in which the control valve V2 is operated, and a second operation in which the second hydraulic control valve V2 is operated by operating the operation lever 12L in the front-rear direction and the first hydraulic control valve V1 is operated by operating in the left-right direction. An operation pattern switching mechanism A that can be switched between the state and the state is provided, and the operation member 17 with which the links 13 and 14 that are operated in accordance with the operation in each of the above directions are linked to the swing base end side of the operation lever 12L.
Is mounted so as to be relatively rotatable around the lever axis, and the operation member 17 is attached to the operation box 17 from the outside of the control box 10 by approximately 90 degrees.
The operation pattern switching mechanism A is configured by providing an operation tool 18 that can be rotated by one degree.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is provided with operation levers that can be cross-swung in the front-rear direction and the left-right direction, respectively. The operation of the operation lever in the front-rear direction operates the first hydraulic control valve, and the operation in the left-right direction operates the first hydraulic control valve. 2 First operating state in which the hydraulic control valve is operated, and second operating state in which the second hydraulic control valve is operated by operating the operating lever in the front-rear direction and the first hydraulic control valve is operated by operating the left-right direction. The present invention relates to a backhoe valve operating structure provided with an operation pattern switching mechanism that can be switched between and.

[0002]

[Prior Art]

 In the backhoe valve operating structure described above, conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open No. 62-172755, a link rod connecting portion to which the operating link rod of each hydraulic control valve is pivotally connected is provided. , Is configured to be relatively rotatable about the operation lever shaft by about 90 degrees. Specifically, the link rod connecting portion is abutted and fixed to the operation lever shaft with a screw to set each operation mode. There was one configured like this.

[0003]

[Problems to be solved by the device]

 In the above structure, the hydraulic control valve corresponding to each operating direction of the cross-swingable control lever is different so that the operator can change and set the operation pattern to suit his or her skill level. .. However, in the above-mentioned conventional structure, the base end of the operating lever is generally covered with dustproof bellows rubber or the like, so when performing the above-mentioned operation pattern switching operation, this bellows rubber is used. It is necessary to lift up the bolts to tighten the bolts, which may damage the bellows rubber when the operator regularly changes the operation pattern as described above, and also loosens the bolts. There was a drawback that operations such as tightening and tightening were troublesome. The present invention aims to solve the above-mentioned problems.

[0004]

[Means for Solving the Problems]

 The characteristic configuration of the present invention is the valve operating structure of the backhoe described at the beginning, wherein an operating member is provided on the rocking proximal end side of the operating lever, with which a link operated in accordance with the operation in each of the above directions is linked, The operation pattern switching mechanism is configured by providing an operation tool that is fitted around the lever axis so as to be rotatable relative to the lever axis, and is provided with an operation tool that can rotate the operation member by approximately 90 degrees from the outer side of the operation box. There is a point.

[0005]

[Action]

 When the operation tool is operated from the outside of the operation box, the operation member is rotated about 90 degrees around the lever axis, and the hydraulic control valve corresponding to the lever operation direction can be changed.

[0006]

[Effect of the device]

 Therefore, the valve to be operated corresponding to the lever operating direction can be changed without changing the posture of the dustproof cover member or the like provided at the base end of the operating lever, and moreover, only by operating the operating tool. This can be done with simple work, eliminating the need for troublesome work such as bolt tightening work using a special tool.

[0007]

【Example】

 Embodiments will be described below with reference to the drawings. The backhoe is shown in FIG. This backhoe is mounted on a traveling machine base 2 equipped with left and right crawler traveling devices 1, 1 driven by hydraulic motors M1, M2, and is swiveled by a swivel motor M3 about a vertical axis so that the swivel base 3 can rotate freely. The backhoe device 4 and the dozer device 5 which can be raised and lowered by the dozer cylinder C1 are connected to the swivel base 3. The backhoe device 4 pivotally connects the boom 6, the arm 7 and the bucket 8 to each other so that they can swing relative to each other. It is structured so that it can be done.

Next, the hydraulic operation structure will be described. In the control box 10 standing upright in front of the driver's seat 9, the hydraulic control valves of the hydraulic motors M1 to M3 and the hydraulic cylinders C1 to C4 are arranged in parallel and operated above the valve group. A linkage mechanism is provided. Then, the left and right traveling operation levers 11, 11 are configured to operate the hydraulic control valves for the left and right traveling hydraulic motors M1, M2, respectively, and a pair of left and right operation levers 12R that are freely swingable in the front-rear direction and the left-right direction. , 12L to operate the backhoe device 4 and the turning hydraulic motor M3. That is, the right operation lever 12R is configured to operate the boom 6 and the bucket 8, and the left operation lever 12L is configured to operate the turning motor M3 and the arm 7.

Then, the swing motor hydraulic control valve V1 [an example of the first hydraulic control valve] is operated by swinging the left operating lever 12L in the left-right direction, and the swing operation in the front-back direction is used for arming. The hydraulic control valve V2 (an example of the second hydraulic control valve) is operated, and the arm hydraulic control valve V2 is operated by swinging left and right, and the swing motor hydraulic control valve is operated by swinging forward and backward. An operation pattern switching mechanism A is provided which can be switched to the state in which V1 is operated. That is, as shown in FIGS. 1 to 5, the links 13, 14 operated in accordance with the operation in each of the above operation directions have the ball joints 15, 16 on the swing base end side of the operation lever 12L. An operating member 17 that is linked via the external fitting is mounted so as to be relatively rotatable around the lever axis, and the operating member 17 can be rotated by approximately 90 degrees from the outside of the control box 10. Is provided to configure the operation pattern switching mechanism A. More specifically, the operation lever 12L is supported on the frame 19 so as to be able to swing in a cross shape around the front-rear axis X1 and around the left-right axis X2. It is externally fitted so that it can rotate relative to it while preventing movement. Then, the operation links 13 and 14 are pivotally connected to the ends of the arms 21 and 22 extending from the operation member 17 via the ball joints 15 and 16 while being positioned on the lever rotation axis. There is. A pulley 23 is integrally rotatably connected to the operation member 17, and is rotated by an operation tool 18 which is supported on the outside of the pulley 23 and the control box 10 so as to be swingable around a horizontal axis X3. A wire 25 is wound and linked so as to rotate in conjunction with a freely operable pulley 24. The pulleys 23, 24 and the wire 25 are fixedly connected at one point so that slips do not occur. The operating tool 18 is configured to be swingable and fixable within a predetermined range by a locking tool 26, and the operating member 17 is rotated about 90 degrees at each operating position. That is, the operating member connecting point of the link 13 linked to the swing motor hydraulic control valve V1 is located on the horizontal axis X2, and the operating member connecting point of the link 14 linked to the arm hydraulic control valve V2 is front and rear. A link that is located on the axis X1 and the operating member connection point of the link 14 linked to the arm hydraulic control valve V2 is located on the horizontal axis X2 and linked to the swing motor hydraulic control valve V1. The operation member connecting point of 13 is switched to a state of being located on the front-rear axis X1. In this way, the operation pattern can be changed.

In the claims of the utility model, reference numerals are provided to facilitate comparison with the drawings, but the invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cutaway plan view of an operation pattern switching mechanism.

FIG. 2 is a cutaway plan view of an operation pattern switching mechanism.

FIG. 3 is a cutaway rear view of the operation pattern switching mechanism.

FIG. 4 is a cutaway rear view of the operation pattern switching mechanism.

FIG. 5 is a cutaway side view of the operation pattern switching mechanism.

FIG. 6 is an overall side view of the backhoe.

[Explanation of symbols]

 10 Control Box 12L Operation Lever 13, 14 Link 17 Operation Member 18 Operation Tool A Operation Pattern Switching Mechanism V1 First Hydraulic Control Valve V2 Second Hydraulic Control Valve

Claims (1)

[Scope of utility model registration request] 1. An operating lever (12L) which is capable of swinging in a cross direction is provided in each of the front-rear direction and the left-right direction, and the first hydraulic control valve (V1) is operated by operating the operation lever (12L) in the front-rear direction. And a first operating state in which the second hydraulic control valve (V2) is operated by operating in the left-right direction, and a second hydraulic control valve (V2) is operated by operating the operating lever (12L) in the front-rear direction, and A valve operating structure of a backhoe provided with an operation pattern switching mechanism (A) capable of switching to a second operating state in which a first hydraulic control valve (V1) is operated by operating in the left-right direction, the operating lever (1
2L) has an operating member (17), which is linked to links (13) and (14) operated along with the operation in each of the above directions, on the swinging base end side and is relatively rotatable around the lever axis. The operation pattern switching mechanism (A) is configured by externally fitting the operation box (10) and providing an operation tool (18) capable of rotating the operation member (17) by approximately 90 degrees from the outside of the control box (10). Backhoe valve operation structure.