JPS633909Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a master link for connecting tracks that facilitates separation and assembly of tracks of a tracked vehicle.

BACKGROUND ART Tracks used for tracked vehicles such as bulldozers are formed by attaching a plurality of track plates with bolts to links that are rotatably coupled to each other using pins and bushes.

The crawler track is provided with a part that can be easily separated in order to facilitate attachment and detachment from the vehicle, and a master pin is used in this part. This master pin has a smaller press-fitting allowance than other pins, and is assembled by using a hydraulic tool or hammering it in. Therefore, it is difficult to separate and assemble at the work site, and it is dangerous to hammer in the work with a sledgehammer. Also, if the press-fitting allowance is too small, the master pin will come out and break during driving.

Therefore, the present invention aims to improve the shape of the link in order to facilitate the separation and assembly of the crawler track.

That is, an object of the present invention is to provide a master link having a hole at one end and another hole at the other end, and to which a track plate is attached to the lower surface by a plurality of bolts, and the master link is connected to an upper link piece and a lower link piece. The dividing surface of each link piece consists of an inclined surface that is inclined toward the hole at the end of the link piece, a series of these inclined surfaces, a horizontal plane below the center line of the hole, and the center of the hole. It is formed from a horizontal plane above the line and an inclined plane connected to the horizontal plane that is inclined towards the hole, and between the two horizontal planes in the middle of the dividing plane of the link piece, the center positions of the two link pieces are oriented in the left-right direction. A mating hole is provided that is offset from the center, and when the split surfaces of both link pieces are joined to each other and the bolt is tightened, a pin is pressed against each side of the mating hole that is offset from the center due to the wedge action of the inclined surface and fixed. To provide a master link for connecting tracks of a tracked vehicle, which is characterized in that:

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a plan view of the crawler track, Figure 2 is the − of Figure 1.
3 is a sectional view of the main part of the upper link piece, and FIG. 4 is a sectional view of the main part of the lower link piece.

In the figure, 1 is a master link, which is divided into an upper link piece 2 and a lower link piece 3. 4 is a pin, 5 is a bush, 6 is a hole in the upper link piece 2 for mounting the bush 5, and 7 is a hole in the lower link piece 3 for mounting the pin 4.

The upper link piece 2 and the lower link piece 3 are joined to each other at dividing surfaces 8a and 8b, and are connected together with the track shoes 9 by bolts 10 and 11.

As shown in FIG. 3, the dividing surface 8a of the upper link piece 2 includes an inclined surface 13a that gently slopes toward the hole 6 from the upper flat surface 12 on the opposite side to the hole 6;・A horizontal surface 14a located below the center line A of 7, a horizontal surface 15a connected to the horizontal surface 14a and located above the center line, and an inclined surface 16a connected to this horizontal surface 15a and inclined toward the hole 6.
It is formed from.

A fitting hole 17a is provided in the middle of the horizontal surfaces 14a and 15a of the upper link piece 2.

As shown in FIG. 4, the same applies to the lower link piece 3, the inclined surface 13b is gently inclined from above the hole 7 toward the side opposite to the hole 7, and the horizontal surface 14b
is connected to the inclined surface 13b and is located below the center line A of the holes 6 and 7.

The horizontal surface 15b is continuous with the horizontal surface 14b and is located above the center line A of the holes 6 and 7. Inclined surface 16b
is connected to the horizontal surface 15b and is gently inclined in the opposite direction to the hole 7, and the engagement hole 17b is provided in the middle portion of the lower link piece 2 between the horizontal surfaces 14b and 15b. 18 is a flat surface of the lower link piece 3.

19 is a pin, and this pin 19 is in the mating hole 17
The diameter is made smaller than the diameter of a and 17b. Note that the center positions of the mating holes 17a and 17b are between the link pieces 2 and 3.
When assembling, they are installed so that they do not match and are shifted to the left or right.

The crawler track is constructed by connecting a plurality of sets of links 20 and one set of master links 1.

The crawler tracks are connected by the master link 1 by press-fitting a bush 5 into the hole 6 of the upper link piece 2 to connect one end of the track, and a pin 4 into the hole 7 of the lower link piece 3.
press fit and bring the other end of the connected crawler track closer together to join the split surfaces 8a and 8b, insert the pin 19, apply the track plate 9 to the lower link piece 3, and attach it with bolts 10 and 11. This is done by fixing it.

The master link for connecting tracks according to the present invention has the following functions and effects.

a By eliminating the master pin and using a split type master link, the crawler track can be easily separated and assembled without the need for special tools.

b. The crawler mounting bolt does not break because the tensile force applied to the master link is received by the split surface of the link and the contact surface of the key.

c Since the pin mating hole is larger than the pin, it is easy to insert, assemble and separate, and when both link pieces are tightened and fixed with bolts, the mating hole and pin are in close contact and a tightening force is generated. , it can be prevented from coming off.

d Since the pins are not press-fitted, the links can be easily separated by simply loosening the bolts.

[Brief explanation of drawings]

Figure 1 is a plan view of the crawler track, Figure 2 is the − of Figure 1.
3 is a sectional view of the main part of the upper link piece, and FIG. 4 is a sectional view of the main part of the lower link piece. 1... Master link, 2... Upper link piece, 3
...Lower link piece, 4...pin, 5...button, 6, 7...hole, 8a, 8b...dividing surface, 9...
...Crack plate, 10, 11... Bolt, 12... Upper flat surface, 13a, 13b, 16a, 16b... Inclined surface, 14a, 14b, 15a, 15b... Horizontal surface, 17a, 17b... Mating hole, 18...Flat surface, 19...Pin, 20...Link.

Claims (1)

[Scope of utility model registration request] In a master link having a hole at one end and another hole at the other end, and to which a track plate is attached to the lower surface with a plurality of bolts, the master link is divided into an upper link piece and a lower link piece, and each The dividing plane of the link piece includes an inclined plane at the end of the link piece that is inclined toward the hole, a series of these inclined planes, a horizontal plane below the center line of the hole, and a horizontal plane above the center line of the hole, and an inclined surface that is inclined from the hole connected to the hole, and a fitting hole is provided in the two link pieces between both horizontal planes in the middle of the dividing plane of the link piece, the center positions of which are shifted from each other in the left-right direction, When the divided surfaces of both link pieces are joined to each other and the bolts are tightened, the wedge action of the inclined surfaces causes a pin to be pressed against each side of the off-center fitting hole and fixed. Master link for connecting tracks of tracked vehicles.