JPH0512374Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to the operation stand structure of a backhoe.

(B) Prior Art Conventionally, in the operation stand of a backhoe, the mounting portion of the operating lever fulcrum and the mounting base of the hydraulic control valve were each constructed separately.

(c) Problems to be solved by the invention As a result, the work becomes complicated when assembling the operating lever and the hydraulic control valve to the operating stand, and errors occur in the assembly position between the operating lever fulcrum and the hydraulic control valve. However, there was a drawback that adjustment of the interlocking mechanism between the fulcrum and the control valve became troublesome.

(d) Means for solving the problem In this invention, lever fulcrums for left and right operating levers that can be tilted vertically and horizontally are installed in series on the upper part, and multiple hydraulic control valves are arranged inside. In the operation stand for a backhoe, a front and rear pivot is disposed between a fulcrum and a hydraulic control valve, and the tilting operation of the lever is transmitted to the hydraulic control valve via the same axis.
The rear wall of the stand is formed into a substantially U-shape with a front opening in plan view, and the upper part of the rear wall is provided with a mounting part for the left and right operation lever fulcrum, and the inner surface of the rear wall is provided with a mounting part for fixing the hydraulic control valve. The mounting base is provided so as to protrude in the side direction, and the front and rear axle supports of the front and back pivots are provided on the left and right side walls at an intermediate height between the mounting portion of the rear side wall and the mounting base, which is approximately U-shaped in plan view. The purpose is to provide an operating stand structure for a bomb hoe.

(e) Functions and Effects According to this invention, the mounting portions of the left and right operating lever fulcrums, the mounting base of the hydraulic control valve, and the pivot portions of the front and rear pivots are integrally formed on the inner surface of the rear wall of the operating stand. Place the above lever fulcrum on the operation stand,
No errors occur when assembling the hydraulic control valve and the front and rear pivot supports, which simplifies subsequent adjustment work.
In addition, the left and right operating lever hydraulic control valve, front and rear pivots, and the operation transmission mechanism between the lever and the control valve can be preassembled using the rear side wall of the operating stand as a base, and then mounted on the backhoe body. Even if the work is carried out rationally and the upper, front, and left and right sides of the operation stand are covered, the left and right operation levers, hydraulic control valves, front and rear pivots, etc. are supported by the rear side wall of the stand. This makes it easier to perform adjustment work by removing the cover, and since the hydraulic control valve is mounted via a mounting base that protrudes from the inside surface of the rear wall, there are bolts, etc. for mounting the control on the rear side of the stand. This has the effect of not exposing the skin and improving the appearance.

(F) Embodiment The embodiment of this invention will be explained in detail based on the drawings. Swivel frame 4 on the top surface of stand 3
A motor section 5 is mounted on the rear of the frame 4, a driving section 6 is disposed in the center thereof, and a bracket 7 protrudes from the front end of the frame 4.
An excavation work section B is connected to the excavation section B via the .

The excavation work section B has a boom support 8 pivotally attached to the bracket 7 so as to be rotatable left and right, and a boom 9, an arm 10, and a bucket 11 are connected to the support 8 in this order so as to be movable up and down. Hydraulic cylinder 1 for swinging between support body 8 and swing frame 4
2. A boom hydraulic cylinder 13 is interposed between the support 8 and the boom 9, an arm hydraulic cylinder 14 is interposed between the boom 9 and the arm 10, and a bucket hydraulic cylinder 15 is interposed between the arm 10 and the bucket 11. These hydraulic cylinders 13,1
4 and 15 are configured to cause the excavation work section B to perform an excavation operation by telescopic operation.

Further, a hydraulic motor 16 is interposed between the traveling frame 2 and the swing frame 4 to rotate the machine, and excavation work is mainly performed using the hydraulic cylinders 13, 14, 15 and the hydraulic motor 1.
This is done by the operation of 6.

These hydraulic actuators are controlled by vertical and horizontal tilting operations of left and right operation levers 18 and 19 installed on an operation stand 17 installed at the front of the driving unit 6. Details are given below. It is as follows.

That is, a flat, substantially box-shaped operation stand 17 is erected at the front of the driving section 6, and left and right operation levers 18, 19 are erected on the upper surface of the stand 17 so as to be tiltable vertically and horizontally via a lever fulcrum G. , same stand 17
The hydraulic cylinders 13, 14,
A control valve 24 is provided which is constructed by horizontally stacking a large number of hydraulic control valves including hydraulic control valves 20, 21, and 22 for 15 control.

Note that the hydraulic control valve 2 for controlling the hydraulic motor 16
3 is disposed below the driving section 6.

Further, front and rear pivots 25 and 2 are provided between the base ends of the left and right operation levers 18 and 19 and the control valve 24.
6 is mounted on a shaft parallel to the stacking direction of the control valve 24, and a plurality of substantially cylindrical bosses 27 are fitted onto the same shafts 25 and 26, respectively, and a plurality of connections are formed on the outer peripheral surface of each of the bosses 27. Ears 28 are provided protrudingly.

In addition, the base ends of the left and right operating levers 18, 19 are protruded from the upper part of the operating stand 17 via a connecting fulcrum G, and the tips thereof are freely tiltable in the vertical and horizontal directions. Upper connecting rods 29, 30 each having a ball joint at the upper end for tilting.
The horizontal tilting motion is transmitted to the upper connecting rods 31 and 32, respectively, and the connecting rods 29,
The lower ends of 30, 31, and 32 are connected to the front and rear pivots 2, respectively.
5 and 26, and transmits the above-mentioned tilting motion to the front and rear pivots 25 and 26 or the boss 27.

From the front and rear pivots 25 and 26, the coaxial 2
5, 26 connecting ears 28 and hydraulic control valves 20, 21,
22, 23 spools 20', 21', 22', 2
3' and the lower connecting rods 3 respectively interposed between them.
3, 34, 35, and 36, the above-mentioned tilting movement is transmitted to each hydraulic control valve 20, 21, 22, and 23, respectively.

In particular, the upper connecting rods 29, 30, 31, 32
and a plurality of connecting ears 2 on the front and rear pivots 25 and 26.
Connection with 8 is configured to enable transfer connection.

As described above, the vertical and horizontal tilting operations of the left and right operating levers 18 and 19 are transmitted to the front and rear pivots 25 and 26 via the upper connection rods 29, 30, 31 and 32 which can be alternately connected; Fixed pin 37
By replacing the left and right operating levers 18,1
9 tilting operation and each hydraulic cylinder 13, 14,
15 and the hydraulic motor 16 can be changed in various ways.

In the figure, 38 indicates a left/right travel control lever, and 39 indicates a hydraulic control valve connected to the lever 38.

The lever fulcrum G at the base end of the left and right operation levers 18 and 19 configured as described above, the control valve 24 configured with a plurality of hydraulic control valves, and the front and rear pivots 25 and 26 are connected to the rear wall surface 4 of the operation stand 17.
Supported by 0.

That is, on the left and right sides of the upper end edge of the rear wall 40 of the operation stand 17, a substantially semicircular lever fulcrum insertion recess is formed from above as the mounting portion 41, and bolts are inserted into the lower left and right sides of each mounting portion 41, respectively. A hole 42 is bored, and the lever fulcrums G of the left and right operating levers 18 and 19 are inserted into each mounting portion 41, respectively, and each lever fulcrum G is fixed by tightening a bolt 43 inserted through the bolt insertion hole 42.

In addition, on the lower left and right sides of the inner surface of the rear side wall 40,
Legs 46 of approximately L-shaped mounting bases 45 formed by extending the mounting surfaces 44 outward are connected by welding, and bolts can be inserted into the mounting surfaces 44 of the mounting bases 45 from the outside. Forming a groove 47 with a cutout,
The control valve 24 is supported in a fixed state by tightening a bolt 48 inserted through the groove 47.

Further, the left and right edges of the rear side wall 40 are bent forward to form narrow left and right side walls 49, and the upper ends of the left and right side walls 49 are extended forward in a substantially triangular shape. form left and right support plates 50, 51 that are inclined diagonally in the front-down direction, and front-rear pivot supports 52, 53 are connected to the lower sides of the support plates 50, 51 to support the front-rear pivot 2.
5 and 26 are pivotally supported.

Therefore, the rear wall 40 of the operation stand 17 is formed in a substantially U-shape with a front opening in plan view, has sufficient strength, and can support all of the functional members disposed on the stand 17. Also, since the stand 17 can be installed independently on the aircraft, the covers 54 on the front and left and right sides of the operation stand 17
can be easily attached and detached. Note that 55 and 56 are the insertion holes and fulcrums of the left and right travel operating levers 38, 57 are boots that cover the base ends of the left and right operating levers 18 and 19, and 58 is a cover for the rear end of the lever fulcrum G.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of a backhoe having the proposed structure. FIG. 2 is a cross-sectional side view of the operation stand.
FIG. 3 is a front view of the same. FIG. 4 is a plan view of the rear side wall of the operation stand. FIG. 5 is a front view of the same. G...Lever fulcrum, 17...Operation stand, 1
8, 19... Left and right operation lever, 20, 21... Hydraulic control valve, 25, 26... Front and rear pivot, 40... Rear side wall, 41... Mounting part, 45... Mounting base, 49...
...Left and right side walls, 52, 53...Anteroposterior axis support.

Claims (1)

[Scope of utility model registration request] Lever fulcrums G of left and right operation levers 18, 19, which can be tilted vertically and horizontally, are arranged in series on the upper part, and a plurality of hydraulic control valves 20, 21... are arranged inside, and the fulcrum G and the hydraulic control valves 20 , 21 . . . , front and rear pivots 25 , 26 are disposed between the same shafts 25 , 26 , and the tilting operation of the levers 18 , 19 is transmitted to the hydraulic control valves 20 , 21 . In the operation stand 17, the rear side wall 40 of the stand 17 is formed into a substantially U-shape with a front opening in plan view, and the left and right operation lever fulcrum G is provided at the upper part of the rear side wall 40.
A mounting portion 41 for fixing the hydraulic control valves 20, 21 is provided on the inner surface of the rear side wall 40 to protrude inwardly, and the rear side wall 4 is approximately U-shaped in plan view.
This operation stand structure for a backhoe includes front and rear pivot supports 52 and 53 of front and rear pivots 25 and 26 projecting inward from left and right side walls 49 at intermediate height positions between a mounting part 41 and a mounting base 45.