JPS6036535Y2 - Repair structure for bumps on crawler tracks - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a repair structure for a bushing in a belly band attached to a tracked vehicle such as a bulldozer.

Conventionally, this type of track has been known to have a structure in which track plates are pivotally connected in an endless manner through link pins, and bushings are fitted around the outer periphery of each pin.

The crawler belt is passed between the sprocket and the idler, and the sprocket is driven by engaging the teeth of the sprocket with the bushings.

For this reason, the outer peripheral surface of the bushing wears due to contact with the sprocket teeth.

Conventionally, when the outer circumferential surface of the bushing wears down to its usable limit, the crawler track is removed from the sprocket and idler, the link and the pin press-fitted into the link are pulled out, the bushing is removed, and a new bushing is replaced.

However, since the pins that are press-fitted into the links are very strongly fitted, a special high-pressure press or the like is required, and the work is very troublesome.

In addition, the worn bushings are discarded, resulting in disadvantages such as being uneconomical.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to provide a structure for repairing a bushing in a crawler track, which allows worn bushings to be repaired and reused with a simple operation.

Embodiments of the present invention will be described below with reference to the drawings.

A crawler track 1 attached to a bulldozer A is wound around a sprocket 2 and an idler 3, and a number of tracks 5 each having a pair of links 4 are pivotally connected to each other in an endless manner by a pin 6. It has a structure in which a bush 7 is fitted around the outer periphery of a pin 6.

Reference numeral 8 denotes a covering member that is fitted and attached to the outer circumferential surface 9a of the bushing 7, and includes a thick-walled substantially semicircular portion 8a that is in close contact with approximately 1/2 circumferential surface of the bushing outer circumferential surface 7a, and both ends of the semicircular portion 8a. A pair of thin bent portions 8b, 8b formed integrally with the bushing 7 form a shape having the same length as the bushing 7, and tightening flanges 9, 9 are integrally formed with the pair of bent portions 8b, 8b. It is.

When the outer circumferential surface 7a of the bushing 7 is worn, the covering member 8 is fitted onto the bushing 7 and the semicircular portion 8a is removed from the worn portion 1 on the outer circumferential surface 7a of the bushing 7.
72 so as to cover the circumferential surface of the bushing 7, and then bend the pair of bent portions 8b, 8b to bring them into close contact with other parts of the outer circumferential surface 7a of the bushing 7, and abut the tightening flanges 9, 9. The covering member 8 is tightly attached to the outer circumferential surface 7a of the bushing 7 by tightening the bolt nuts 10 to the tightening flanges 9, 9, and the 172 circumferential surface of the outer circumferential surface 7a of the bushing 7 is formed into a substantially semicircular portion 8.
Cover with a.

As described above, when the outer circumferential surface 7a of the bushing 7 is worn out, the bushing 7 can be repaired by attaching the covering member 8 without removing the crawler track 1, which simplifies the work and does not require special tools. In addition, it is economical because the bushing 7 can be reused.

6 to 9 show another embodiment, in which a semicircular portion 8a with a wall thickness that allows the covering member 8 to be expanded and deformed to some extent and a diameter slightly smaller than the diameter of the bushing 7; It is formed by a pair of tightening flanges 9, 9 continuously formed at both ends of the portion 8a, and the inner surface of each tightening flange 9 has a slight arc-shaped portion 9a and a smooth portion 9b that are continuous with the semicircular portion 8a. The approximately semicircular portion 8a of the covering member 8 is strongly press-fitted into the 172 circumferential surface of the outer circumferential surface 7a of the bushing 7, and the pair of tightening flanges 9, 9 are attached to the bushing 7.
The semicircular portion 8a is fitted into the 172 circumferential surface of the outer circumferential surface 7a of the bushing 7 by expanding and deforming along the outer circumferential surface 7a of the bushing 7. The bolt 12 is inserted and screwed into the screw hole 13 drilled in the longitudinal center of the other tightening flange 9, and the covering member 8 is attached to the outer circumferential surface 7a of the bushing 7, so that the substantially semicircular part 8a is attached to the bushing 7. It has a structure in which it is attached so as to tightly fit on the 172 circumferential surface of the outer circumferential surface 7a.

In this way, since the covering member 8 is tightened at the central portion in the longitudinal direction, over-tightening at both end portions can be prevented.

Further, the reason why the bolt 12 is brought into contact with the outer circumferential surface 7a of the bush 7 is to prevent rotation.

In other words, since 1/2 of the outer circumferential surface 7a of the bushing 7 comes into contact with the sprocket teeth, it can be reused by covering the 112 circumferential surface.

Since the present invention is configured as described above, when the 172 circumferential surface of the outer circumferential surface 7a of the bushing 7 is worn out, the substantially semicircular portion 8a of the covering member 8 can be removed from the bushing without removing the crawler track or pulling out the pin 6. Approximately 1/2 circumferential surface of the outer circumferential surface 7a of 7 can be covered and repaired so that it can be reused.

Therefore, worn bushings can be repaired and reused with a simple operation, and this is also economical.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention: Fig. 1 is an overall view, Fig. 2 is an exploded perspective view of the crawler track, Fig. 3 is a front view of the covering member, and Fig. 4 is an illustration of the covering member covering the bushing. 5 is a cross-sectional view, FIG. 6 is a front view showing another embodiment, FIG. 7 is a side view, and FIGS. 8 and 9 are explanations of the installation process. It is a diagram. 4 is a link, 5 is a shoe plate, 6 is a pin, 7 is a bush, 8 is a covering member, 8a is a substantially semicircular portion, 9 is a tightening flange, 1
0 is Boltnut.

Claims (1)

[Scope of utility model registration request] In a crawler track in which crawler plates 5 provided with links 4 are pivotally connected in an endless manner via pins 6, and pushers and nearers are fitted to the outer periphery of each pin 6, approximately 1 on the outer circumferential surface 7a of the bush 7.
/2 A covering member 8 is formed which includes a pair of tightening flanges 9, 9 integrally formed at both ends of a substantially semicircular portion 8a that is in close contact with the circumferential surface of the covering member 8. Part 8
a to approximately 1/2 circumference of the outer circumferential surface 7a of the bushing 7, and then tighten and fix the pair of tightening flanges 9, 9 with bolts and nuts etc. A repair structure for a bushing in a crawler track, the surface of which is covered with a substantially semicircular portion 8a of a covering member 8.