JPH0235592Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an endless footwear for use in bulldozers, power shovels, etc.

[Conventional technology]

Traditionally, iron tracks have been used. The structure of the iron crawler track itself is publicly known, for example,
It is disclosed in JP-A-58-167727, JP-A-59-77979, JP-A-59-140351, JP-A-60-42165, etc. However, since iron tracks generate noise and damage paved roads, they are replaced with rubber tracks when the need arises. In this replacement, the sprocket (drive wheel), idler (guide wheel), and upper and lower rollers were all replaced, as the rubber tracks were partially incompatible with the steel tracks. Furthermore, current rubber tracks are formed in an endless shape and are required to have high tensile strength and low elongation in the longitudinal direction, so they are reinforced with steel cords or fibers.
Furthermore, since rigidity is required in the width direction, core metals are buried at regular intervals.

[Problem that the invention attempts to solve]

If the shape of the rubber track described above is changed to make it compatible with the steel track, that is, if the shape is changed so that it meshes with the sprocket, idler, and upper and lower rollers for the steel track, the elastic body such as rubber and the buried metal will be removed. If excessive force is applied between the two, peeling may occur. On the other hand, endless elastic crawlers that do not use reinforcing materials such as core metal or steel cord require that the elastic material such as urethane rubber has a specified compression and tensile strength. Problems occur when bending when passing, and if you bend it forcibly, cracks etc. will occur.
High hardness elastic bodies cannot be used.

In order to provide an elastic crawler track that does not cause the above-mentioned defects, the present invention eliminates the metal embedded structure in the elastic body, and provides an elastic track that has strength comparable to that of a metal embedded structure. The purpose is to

[Means for solving problems]

To achieve the above object, the elastic crawler track of the present invention consists of an integrated shoe and link made of an elastic body, a pin and a bush made of a rigid body, and a prevention plate that prevents stretching in the circumferential direction. It consists of a crawler track with a link formed integrally with a pin, a pin inserted into a bush, and a prevention plate stretched between circumferentially adjacent pins.

[Effect]

In the above-mentioned elastic crawler track, the shoes are made of an elastic material, so there is no problem with noise. Butsuyu is a rigid body,
It is made of metal, engineering plastic, ceramic, etc., and is made separately in advance and then cast into the link part of the integrated shoe and link. The reason for making the bush a rigid body is that it must withstand the surface pressure of the sprocket, which is impossible with urethane elastomer. Molding the bush into the link is not embedding, so there is no problem of peeling like embedding multiple metal members. Bending when connected endlessly is possible between the bush and the pin.

Furthermore, the elastic body is stretched in the circumferential direction by a prevention plate, so that proper engagement with the sprocket and the like can always be achieved. Therefore, even if the iron crawler is replaced with the elastic crawler according to the present invention, there is no need to replace even the sprocket or idler, and compatibility with the iron crawler is ensured.

〔Example〕

Hereinafter, preferred embodiments of the elastic track according to the present invention will be described with reference to the drawings.

FIG. 1 shows a state in which a plurality of pieces are connected in the elastic crawler track of the present invention, and FIGS. 2 to 4 show one piece.

In FIG. 1, 1, a shoe of a crawler track, and 2 indicate links, and shoe 1 and link 2 are made of elastic bodies and are molded integrally with each other. Show 1 is
As shown in FIGS. 2 to 4, it has a width A, extends in a direction C perpendicular to the circumferential direction B of the endless crawler track, and has a lug 3 integrally formed on the outer periphery. Link 2 is show 1
It rises on the inner circumference side at right angles to. Both ends of the link 2 in the circumferential direction B are offset from each other in the longitudinal direction C of the shoe 1, and are overlapped with the link 2' of an adjacent piece as shown in FIG. The end of a cylindrical bush 4 made of a rigid body, for example metal, is cast into the end of the link 2 which is offset toward the center in the longitudinal direction C of both ends in the circumferential direction B. The bush 4 extends in the shoe longitudinal direction C. Link 2
A hole 7 for inserting the pin 5 is formed at the other end. The pieces are placed in the circumferential direction B as shown in Figure 4.
The pins 5 are inserted into the holes 7' of the links 2 of the pieces adjacent to the bush 4, so that the pieces are connected in the circumferential direction B, forming an endless track. The pin 5 and the bush 4 are fitted so that they can rotate relative to each other. This allows each piece to be joined and bent, similar to iron tracks. The circumferential pitch of the pins 5 is the same as that of the iron crawler track.

The integrated elastic crawler track of shoe 1 and link 2 stretches in the circumferential direction B when a driving force in the circumferential direction B is applied to the endless crawler track.
As shown in the figure, each adjacent pin 5,5
A prevention plate 6 for preventing elongation is placed between the two. That is, the prevention plate 6 is used to prevent the urethane rubber of the shoes 1 and links 2 from stretching, and to ensure proper engagement with the sprocket at all times.

The elastic body that integrally constitutes the shoe 1 and the link 2 is an elastic material that can withstand ground pressure on the shoe lugs and has good abrasion resistance, such as thermosetting, thermoplastic polyurethane elastomer, or RIM material with a hardness of 85 to 95. something is suitable for use. I tried using various elastomers for the prototype, but the polyether type -
Mocha-curing urethane elastomer with a hardness of 90 gave the best results in prescribed tests such as wear resistance.

As the material of the bush 4, metal, engineering plastic, or ceramic can be used, since urethane elastomer cannot withstand the surface pressure of the sprocket (a member that meshes with and drives the endless track). Iron or a member similar to that of the bush 4 can be used as the pin 5 material.
In the prototype, metal was used for the pins and bushes, and the hardness was set to HRC55 for the pins and HRC52 for the bushes, and good pressure resistance, joint strength, and flexibility were obtained.

The prevention plate 6 is made of metal material, fiber-filled plastic,
A wire strand was used, and the prototype was made of metal and engaged with a metal pin. In this case, a tensile stress of 12 kg/cm ² was continuously applied, but the elongation was suppressed to less than 3%, and this elongation prevention force was sufficiently suitable for use.

[Effect of idea]

When using the elastic crawler track of the present invention, the following unique effects can be obtained.

First, unlike the conventional structure in which multiple reinforcing metal members are completely embedded in the elastic body, the elongation is compensated for by the prevention plate 6, which prevents the embedded metal members from peeling off from the elastic body. A highly reliable elastic crawler track was obtained, with no damage to the pieces caused by this.

In addition, by adding the prevention plate 6, it is possible to obtain a small elongation characteristic in the circumferential direction comparable to that of iron crawlers, and the circumferential pitch of each piece can be made the same as that of iron crawlers. When replacing the track, there is no need to replace the sprocket or idler, making the replacement work much easier.

Furthermore, since the bushing 4 is a rigid body, it can sufficiently withstand the surface pressure of contact with the sprocket, and has strength and durability comparable to those of steel crawlers.

In addition, since the shoe 1 and the link 2 are integrally formed as an elastic body, the shoe 1 and the link 2 can be easily formed together, and the end of the bush 4 can be easily cast into the link 2, making manufacturing extremely easy. The process was simplified and costs were reduced.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a plurality of pieces of the elastic track of the present invention connected together, Figure 2 is a front view of one piece, Figure 3 is a side view of the piece in Figure 2, and Figure 4 is the figure shown in Figure 2. This is a half front view of the piece. 1...Show, 2...Link, 3...Lag, 4
...Butsuyu, 5...pin, 6...prevention plate.

Claims (1)

[Scope of utility model registration request] It consists of an integrated shoe and link made of an elastic body, a pin and bush made of a rigid body, and a prevention plate that prevents stretching in the circumferential direction.The bush and link are integrally formed, and the pin is inserted into the bush. , an elastic crawler track consisting of a prevention plate stretched between circumferentially adjacent pins.