JPS5934551Y2 - Rubber pads for tracks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a track mounted on a tracked vehicle, and more particularly to a rubber pad provided on the running surface of the track.

Metal tracks are constructed by connecting metal tracks (track shoes) to each other in an endless manner using pivots or end connectors, and the grouser installed on the ground contact surface of each track shoe causes significant damage to the paved road surface during running. To do this, it is common to attach a rubber pad to the ground contact part of the crawler track.

That is, in FIG. 1, reference numeral 1 indicates a track plate constituting a crawler track, which is made of cast steel or forged steel, and a crawler track 2 is formed by connecting a large number of track plates 1 in an endless manner. Reference numeral 3 indicates a connecting pin. be.

Further, in the figure, 4 is a sprocket wheel, and 5 is a lower roller.

A rubber pad is attached to the ground contact surface (the surface in contact with the road) of each shoe shoe 1. This pad 6 has such a size and shape that its surface protrudes slightly outward from the ground contact surface of the shoe shoe. It consists of a rubber body and a metal fitting (back plate) (hereinafter referred to as a mounting metal fitting) that supports the rubber body, and can be attached to each track plate via the metal fitting.

Conventional rubber pads were simply a homogeneous rubber block attached to a mounting bracket, so they were prone to wear and were subject to severe wear and damage due to chipping. In the case of bad conditions, it is very difficult, and the disadvantage is that it takes a lot of effort for practical maintenance (replacement of parts due to short lifespan).

In order to eliminate these drawbacks, pads in which reinforcing cloth was buried inside the pad body were proposed (for example,
(Refer to Publication No.-3612).

In a pad in which this reinforcing fabric is embedded within the pad body, the presence of the reinforcing fabric separates the elastic body constituting the pad body into an upper part and a lower part with the reinforcement as a boundary.In other words, the pad Since the rubber that makes up the main body will be separated by the reinforcing cloth, there is a risk that the main body of the pad will separate from its laminated parts and be damaged, which will reduce the life of the pad and reduce the indexing force. It has the disadvantage of being a risk.

The purpose of the present invention is to provide a rubber pad that solves these drawbacks of conventional ones.
In a crawler rubber pad in which a pad body made of a molded body of elastic material such as rubber is fixed to a mounting bracket, a breaker is formed by meshing natural fibers or synthetic fibers inside the pad body, and this breaker is made of a single layer. Alternatively, the breaker is characterized in that it is embedded in a multi-layered integral molding, and the outer circumferential end of the breaker is rolled up and fixed to a mounting fitting.

Next, an embodiment of the present invention will be explained with reference to FIGS. 2 to 7.

In FIG. 2, reference numeral 11 denotes a mounting bracket (back plate), and a pad body 12 made of an elastic material such as rubber is fixed to the mounting bracket.
As shown in the figure, two layers of breakers 13 and 14 are arranged at appropriate intervals.

Each breaker is the same as the reinforcing cloth belt buried in rubber belt conveyors, etc., and is made of natural fibers knitted (woven) into a mesh structure of synthetic fibers. The purpose of use is different from that of woven materials (synthetic fibers such as nylon and tetron, or steel).

In other words, the purpose of the tire cord is to impart appropriate rigidity to the rubber, and the cord layers are closely laminated in several (3 to 11) layers (usually called fly numbers), dividing the rubber layers. It forms a fault line like this.

Since the breaker used here has a mesh having 3 to 6 wear meshes, the rubber elastic layer is characterized in that it serves the purpose of reinforcement without being divided.

The mesh breaker here refers to synthetic fibers such as vinylon, nylon, and tetron (mainly long fibers, limited to vinylon, short fibers may also be included), for example, with a thickness of 210 denier, in warp or weft. Entertainment: 4, 6 or 8 strands with a coarse density of 8 to 16 strands 150
When embedded in a rubber-like elastic body, the fibrous surface is treated with a primer using resorcinol, formalin, etc. to strengthen the integration with T4 rubber. It is something.

When using cotton thread, special knitting called hand-woven (mojiriori) is used.
The yarn thickness and density are similar to those of the synthetic fibers, and in the case of cotton yarn material, no chemical pretreatment for adhesion is performed.

FIG. 7 shows an embodiment in which the breaker is knitted.

To further explain the effect of burying this breaker,
In conventional pads, despite considerable research and improvement in the retention properties of the elastic rubber, damage due to wear and chipping has been significant.

The maximum size of the chipping is 20 mm, and the average is 5.
It was approximately 10 mm.

At this point, the crack (
This is where the function of preventing the growth of tears (tearing) plays a major role.

Each breaker 13, 14 is completely covered with an elastic material such as rubber at an appropriate depth (position from the outer surface) without being exposed to the outside, and at this time, the pad body 12 is placed between each breaker and It goes without saying that the space between the breaker and the mounting bracket is also filled; in other words, the breaker is embedded in the elastic body mounted on the mounting bracket 7, and as shown in Fig. 3, the breaker is filled with The outer circumferential end portion is rolled up and fixed to the mounting metal fitting to further enhance the reinforcing effect and to prevent the pad body from peeling off from the mounting metal fitting.

It should be noted that in order to mold such a structure, it is obvious that the breaker and the pad body can be easily integrally molded by, for example, injection molding or transfer molding.

By adopting the above-mentioned composite structure, the pad body of the rubber pad of the present invention is reinforced with a breaker, so part of the external force is borne by the mesh fibers, so the wear resistance and chipping resistance of the pad body are improved. This will greatly improve the reliability and maintainability of the rubber padded track as a whole.

In addition, the pad of the present invention has a simple structure and manufacturing method, so it can be mass-produced.

That is, generally, a rubber molded product is pressurized and heated in a vulcanization mold, and vulcanization (crosslinking reaction) occurs as temperature and time pass.
Although it becomes a solid, most methods generally use a direct pressure method (inserting a vulcanization mold into a press heating plate, applying pressure, and heating).

Although this direct pressure method may be effective when the object is thin and small, the work efficiency decreases as the volume increases.

The demand for these pads is large, and for this reason, it is necessary to rationalize the manufacturing method (reduce costs through mass production).In this respect, the present invention, which uses injection or press-in molding methods, can provide rubber pads at low cost. be.

The rubber elastic body is mainly made of natural rubber, and may be blended with synthetic rubber in some cases, but the following initial physical properties are desirable for the rubber elastic body.

Hardness Hso JIS, A 55~90 Tensile strength Kg/cm 2150~300 Elongation at break %
200-700 tear strength Kg/cr
r150 Above Next, there are various possible forms of the breaker placed inside the pad body other than the example shown in Figure 3.
That is, for example, a combination of breakers 13, 14 along the outer circumferential surface as shown in FIG. 4 and a loop laminated type breaker 15 provided inside the breakers 13, 14, and a combination of breakers 13, 14 along the outer circumferential surface and the inside thereof as shown in FIG. In combination with breakers 16 arranged in parallel to
For example, 7 is a flat layer.

In either case, the breaker is buried inside the pad main body 12, and its outer peripheral end is rolled up and fixed to the mounting bracket, but the illustration of that part is omitted in FIGS. 4 to 6.

In addition, 11 in Figures 2 to 6 is a mounting bracket, and Figure 7 is 1 of 2 holes.
8 is twisted yarn, 19 is vertical (horizontal) yarn, 20 is horizontal (vertical)
It's a thread.

As described above, according to the present invention, the rubber pad provided on the ground contact surface (part) of the shoe is reinforced from the inside by a breaker, giving it appropriate elasticity and adjusting the elastic modulus. , Deformation during use is maintained in good condition.

As a result, the chipping resistance and abrasion resistance are dramatically improved compared to conventional ones, and the reliability of the rubber padded track shoes (belts) can be improved.

In particular, in the present invention, the breaker buried within the pad body uses a mesh type, so there is no possibility that faults will occur within the pad body due to the embedding of the breaker, and as a result, the rubber pad In addition to increasing the strength, the outer circumferential edge of the breaker is rolled up and fixed to the mounting bracket, which further strengthens the bonding strength between the pad body and the mounting bracket, which eliminates the disadvantage of the conventional one that the pad body easily peels off from the mounting bracket. The practical effects of the present invention are remarkable.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the crawler track, and FIGS. 2 to 6 are side sectional views of each embodiment of the rubber pad according to the present invention. FIG. 7 is a schematic diagram of the composition of the Ible force. The opening in Figure 7 is a partially enlarged schematic diagram. Figure 1, 1... Tracks, 2... Tracks, 3
...Connecting pin, 4...Sprocket wheel, 5...Lower roller, 6...Rubber pad.

Claims (1)

[Scope of utility model registration request] A crawler rubber pad has a pad body made of a molded body of elastic material such as rubber and is fixed to a mounting bracket, and a single layer or a breaker made of natural fibers or synthetic fibers bordered by a mesh-like fabric is placed inside the pad body. A crawler track rubber pad in which a multi-layered layer is embedded by integral molding, and the outer peripheral end of the breaker is rolled up and fixed to a mounting fitting.