JPH0726576A - Pivotal support structure for back hoe - Google Patents

Abstract

PURPOSE:To easily and quickly perform shim adjusting operation for a pivotal support structure to pivotally support and joint a bucket to an arm, and prevent the loss of parts at the time of demounting the bucket. CONSTITUTION:A collar 17 is internally coupled to the boss 16a of one bracket 15a fitted to a bucket 11, and a pivotal support boss section 10a at the end of an arm 10 laid between the collar 17 and the boss 16b of the other bracket 15b is pivotally jointed via a pivotal shaft 20 inserted through both bosses 16 and 16b. Also, a flange 20a at the end of the shaft 20, a washer 18 coupled to the outer end of the collar 17 in such a way as incapable of relative turn, and a shim 19 laid between the bracket 15a and the washer 18 are all together tightened, jointed and fixed to the external surface of the bracket 15a via the first bolt 21. The washer 18 and the shim 19 are also together tightened, jointed and fixed to the external surface of the bracket 15a via the second bolt 22. In addition, the shim 19 is peripherally divided in a plurality of sections, and each of the divided shim sections 19a and 19b is detachably engaged and supported with the first bolt 21 laterally. Also, the second bolt 22 is inserted in and support the sections 19a and 19b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pivot structure for connecting a bucket to an arm of a backhoe.

[0002]

2. Description of the Related Art Conventionally, as a structure of a pivotal support portion between a bucket and an arm in a backhoe, for example, an actual open sho 59-29 is used.
As disclosed in Japanese Patent No. 415, a pivot shaft is inserted through a pair of left and right bosses provided on a bucket and a pivot boss portion of an arm tip located between the bosses. A structure is often used in which the pivot shaft is fixed to the bucket side by an appropriate means and the pivot shaft and the pivot boss portion at the tip of the arm are connected so as to be rotatable relative to each other. Further, in the above structure, the sliding contact surface between the pivot boss portion at the arm tip and the boss on the bucket side is worn with use, and the sliding contact surface between the pivot boss portion at the arm tip and the boss on the bucket side is rotated. There is play in the axial direction of the support shaft.If this play becomes large enough to support the work, a ring-shaped shim with an appropriate thickness is provided between the pivot boss part at the arm tip and the boss on the bucket side. Is attached to eliminate the play in the direction of the pivot axis of the bucket with respect to the arm.

[0003]

According to the above-mentioned conventional structure, when adjusting the gap between the pivot boss portion at the arm tip and the boss on the bucket side by incorporating the shim, the pivot shaft is pulled out from the boss. It was necessary to attach the shim and insert the pivot shaft into the boss again, which made the operation complicated and time-consuming. In addition, when removing the bucket, all the connecting parts must be disassembled, and the shim may be lost. SUMMARY OF THE INVENTION It is an object of the present invention to provide a pivotal support structure capable of easily and quickly performing such a gap adjusting operation on a sliding surface and preventing loss of parts when removing a bucket. .

[0004]

To achieve the above object, the present invention is characterized in that a pair of left and right brackets erected on a bucket are respectively provided with bosses, and one of the bosses is internally fitted with a collar. With the pivotal boss portion at the tip of the arm interposed between the collar and the other boss, the pivot shaft inserted through both bosses allows the arm and bucket to rotate relative to each other. , And a flange provided at the tip of the pivot shaft, a washer that engages with the outer end of the collar in a relatively non-rotatable manner, and a shim interposed between the bracket and the washer. The first bolt is connected and fixed to the outer surface of the bracket together, and the washer and shim are also connected and fixed to the outer surface of the bracket together with another second bolt, and the shim is divided into a plurality of pieces in the circumferential direction. On the part, engage the first bolt from the side. And a notch can, in that is provided with a through hole for inserting the second bolt.

[0005]

According to the above construction, when the play in the pivot axis direction of the bucket with respect to the pivot boss portion at the arm tip becomes large, the second bolt penetrating the shim is removed and the first bolt is loosened a little. By pulling out the shim part of an appropriate thickness from the axial center of the pivot shaft, and then tightening the bolt again, push the pivot shaft and collar inward by the thickness of the shim that has been pulled out. , Adjust the play in the direction of the pivot axis of the bucket. When removing the bucket, the first bolt that fastens and fixes the flange is removed to remove the pivot shaft. In this case, since the second bolt penetrates the shim portion and holds it, the shim portion does not fall off during the work.

[0006]

As is apparent from the above description, according to the present invention, the shim portion can be inserted / removed from the lateral side of the axis of the pivot by simply pulling out the second bolt and loosening the first bolt. Work can now be done easily and quickly without the need to attach or detach the pivot. Further, since the pivot shaft can be removed while leaving the shim portion, it is possible to reliably prevent the shim portion from falling off during the bucket removing operation.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 shows a backhoe to which the present invention is applied. This backhoe is provided on the upper part of the traveling machine body 3 provided with the crawler traveling device 1 and the dozer 2, and the driving unit 4 and
A revolving base 6 provided with a driving unit 5 is mounted, and a backhoe device 8 is attached to a front portion of the revolving base 6 via a swing bracket 7.

The backhoe 8 includes a swing bracket 7, a boom 9, an arm 10, and a bucket 11.
Are sequentially pivotally connected, and the boom cylinder 12, the arm cylinder 13, and the bucket cylinder 14 are swingably driven. Further, as shown in FIG. 5, the dozer 2 uses a pair of left and right arms 2b for supporting the blade 2a formed of a round pipe.

The present invention is characterized by the structure of the pivot portion of the bucket 11 and the arm 10. The detailed structure of the structure will be described below with reference to the drawings. As shown in FIG. 1, bosses 16 a and 16 b are formed on a pair of left and right brackets 15 a and 15 b protruding from the bucket 11, and one boss 16 a
In a state in which a collar 17 having a flange is internally fitted and penetrated from the inside of the pivotal support portion to a, and a washer 18 and a plurality of shims 19 are externally fitted and attached to the outer protruding portion of the collar 17,
7, the pivot shaft 20 with a flange inserted from the outside is inserted between the pivot boss portion 10a at the tip of the arm 10 located between the bosses 16a and 16b and the other boss 16b, The rectangular plate-shaped flange 20a attached to the outer end of the shaft 20, the washer 18, and the plurality of shims 19 are jointly connected to the outer surface of the bracket 15a by the first bolts 21 and removed from the flange 20a. In this position, the washer 18 and the shim 19 are jointly fastened and connected to the outer surface of the bracket 15a by the second bolt 22. Therefore, by adjusting the shim thickness, the distance between the inner end surface of the collar 17 and the inner end surface of the other boss 16b can be adjusted to an appropriate dimension with respect to the width of the pivot boss portion 10a at the tip of the arm 10. Configured.

As shown in FIG. 3, a pair of protrusions 17a are formed at diagonal positions on the outer end of the collar 17, and a pair of recesses are formed on the inner periphery of the washer 18 to engage the protrusions 17a. 18a is provided, and the washer 18 is attached to the bracket 15a.
Collar 1 which is adjusted in the axial direction by fixing to
7 is non-rotatably supported on the boss 16a. or,
As shown in FIG. 2, the shim 19 has a two-part structure in which shim portions 19a and 19b having partial arc shapes are butted into a substantially ring shape by abutting from a direction perpendicular to the pivot axis, and each shim is formed. The portions 19a and 19b are provided with a notch portion 23 that laterally engages the first bolt 21 and the second portion.
A through hole 24 through which the bolt 22 is inserted is formed.

An O-ring 25 is externally fitted and attached in order to prevent foreign matter from entering the gap between the pivotal boss portion 10a at the tip of the arm 10 and the inner end surface of the collar 17 and the inner end surface of the other boss 16b. . Also, the divided shim parts 19a, 1
For 9b, a punched product having the same shape is reversed and used.

The present invention is configured as described above, and due to the wear caused by the rocking of the bucket 11 with respect to the arm 10, the distance between the inner end surface of the collar 16 and the inner end surface of the other boss 15b is at the tip of the arm 10. When the width becomes larger than the width of the pivot boss portion 10a, the second bolt 22 is removed, the first bolt 20 is slightly loosened, and the shim 19 is extracted by an appropriate thickness, and the first bolt 21 and the first bolt 21 are again removed.
Shim 1 with bolt 22 tightened and collar 17 pulled out
9 is displaced inward by the thickness of 9 and the distance between the inner end surface of the collar 17 and the inner end surface of the other boss 16b is set to an appropriate dimension with respect to the width of the pivot boss portion 10a at the tip of the arm 10. Adjust to. Further, if the first bolt 21 is pulled out, the pivot shaft 20 is left with the shim portions 19a and 19b left.
Can be removed.

It should be noted that reference numerals are given in the patent claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a pivotal support structure according to the present invention.

FIG. 2 is a side view showing a pivotal support structure.

FIG. 3 is a sectional view taken along the line AA in FIG.

FIG. 4 is an exploded perspective view of a pivotal support structure.

FIG. 5 is a perspective view of a dozer.

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

[Explanation of symbols]

 10 arm 10a pivot support boss 11 bucket 15a, 15b bracket 16a, 16b boss 17 collar 18 washer 19 shim 19a, 19b shim portion 20 pivot shaft 20a flange 21 first bolt 22 second bolt 23 notch 24 24 through hole

Claims (1)

[Claims] 1. A boss (16) is provided on each of a pair of left and right brackets (15a), (15b) provided upright on a bucket (11).
a) and (16b) are formed, a collar (17) is fitted into one boss (16a), and a pivotal support of the tip of the arm (10) is provided between the collar (17) and the other boss (16b). With the boss (10a) interposed, both bosses (16
bosses (16a), (16b) and collar (1) so that the arm (10) and the bucket (11) are relatively rotated by a pivot shaft (20) inserted through a) and (16b).
7) and a pivot boss (10a) are pivotally connected to each other, and a flange (20) provided at the tip of the pivot shaft (20).
a), a washer (18) engaged with the outer end of the collar (17) in a non-rotatable manner, and a shim (19) interposed between the bracket (15a) and the washer (18). (21) is jointly fixed to the outer surface of the bracket (15a) together, and the washer (18) and the shim (1)
9) with another second bolt (22) to the bracket (15
The shim (19) is divided into a plurality of pieces in the circumferential direction by jointly fastening and fixing them to the outer surface of a), and each of the divided shim portions (19a) and (19b) is laterally attached to the first bolt (21). The pivotal support structure of the backhoe, further comprising a notch (23) that can be engaged and disengaged and a through hole (24) through which the second bolt (22) is inserted.