JPH06144311A - Rubber crawler - Google Patents

Abstract

PURPOSE:To obtain an efficient rubber crawler, which can prevent the run-off between a rolling wheel and a sprocket and of which resistance at the time of winding around of an idler or the like is small, by arranging steel cords in a line, and coating the steel cords with synthetic resin. CONSTITUTION:Multiple metal cores 2 are arranged laterally in the cross section of a rubber elastic body 1 and embedded inside of the rubber elastic body 1, and a line of steel cords 3 is buried so as to surround the metal cores 2. The steel cords 3 are coated with urethane rubber 5 in a line, and embedded in the rubber elastic body 1 in the longitudinal direction. Consequently, separation of the steel cords 3 inside of the rubber elastic body 3 is eliminated. As a rubber crawler, epoxy resin, superpolymeric polyethylene, ebonite, and polyamide resin are used besides urethane rubber. At the time of winding this crawler around of an idler, since a line of steel cords 3 and the synthetic resin 5 exist on the same surface, namely, they exist on the neutral surface relative to the bending, the winding resistance is small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler used for running parts of agricultural machines, construction machines and the like, and more particularly to improvement of a steel code part as a tensile body.

[0002]

2. Description of the Related Art In a conventional rubber crawler, steel cords serving as a tensile body are embedded in the rubber in a row in the longitudinal direction thereof. Therefore, when the rubber crawler is used, tensile force is applied to the steel cord, and
On the other hand, due to the repeated expansion and contraction of the rubber elastic body,
The boundary between the rubber and rubber was easily broken.

Further, as a means for increasing the rigidity of the rubber crawler, for example, an organic fiber cord is buried in the rubber in a bias state, but this causes variations in the production or the production. There is also a demerit that it takes time and labor as a result, resulting in an increase in cost. Furthermore, by embedding this bias layer in rubber, there has been a drawback that the rigidity resistance at the time of being wound around an idler, a sprocket, etc. is also increased.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to improve the above-mentioned drawbacks of the prior art, and basically relates to the improvement of the steel cord portion as a tensile body. Is.

[0005]

In order to solve the above problems, the present invention has been made to solve the problems by adopting the following constitution. That is, the gist of the present invention is to provide a rubber cord having a steel cord as a tensile body embedded in an endless rubber elastic body in the longitudinal direction thereof. In addition to the above, the present invention relates to a rubber roller characterized in that the steel cord is coated with a synthetic resin, and as the synthetic resin, for example, epoxy resin, polyethylene high molecular weight, ebonite, urethane rubber, It is a rubber crawler using a polyamide resin.

In particular, as a synthetic resin for coating a steel cord, a thermosetting resin having a modulus of elasticity which is at least twice as high as that of a rubber elastic body constituting a rubber crawler at room temperature. Thermoplastic synthetic resins are preferably used. or,
Assuming that the diameter of the steel cord is d, the number of steel cords to be driven into the synthetic resin, that is, the pitch of the steel cord is preferably π × d / 2 or more, and practically about 1.7 to 3x
d is preferred. Furthermore, the thickness of the synthetic resin is about 1.
It is about 5 to 3d. The composite with the steel cord rubber can be formed into a spiral ring in the synthetic resin by extrusion molding, laminating, or a filament winding method in some cases.

[0007]

According to the present invention, a layer having a relatively high hardness, which is a synthetic resin layer, is embedded in the rubber elastic body in the longitudinal direction by enclosing the steel cord row. This is because the synthetic resin is integrated with the steel cord and is embedded in the rubber elastic body, so that there is no dispersion in the rubber elastic body, and the steel cord does not disperse.
There is no direct contact between the rubber and the rubber, and the rubber will not run out. In addition, the synthetic resin layer is
It covers the cord, and even when wound on an idler or sprocket, it is at the same horizontal level as the steel cord, so it does not increase the resistance when wound. . Furthermore, the presence of this synthetic resin layer also prevents lateral displacement of the rubber crawlers,
It also has an effect on the twisting of the rubber crawler.

[0008]

The present invention will now be described in more detail with reference to the drawings. FIG. 1 is a sectional view of the rubber crawler of the present invention. In the figure, reference numeral 1 is a rubber elastic body, in which a large number of cored bars 2 are embedded side by side in the width direction, and a row of steel codes 3 is embedded so as to surround the cored bar 2. Reference numeral 4 denotes a lug formed on the outer peripheral surface of the rubber crawler. Now, in such a rubber crawler, a row of the steel cords 3 is covered with a thermoplastic urethane rubber 5. That is, the steel cord 3 is covered with the urethane rubber 5 so as to form a line, and the steel cord 3 is directly embedded in the rubber elastic body 1 in the longitudinal direction. Therefore, the steel cord 3 is the rubber elastic body 1.
It will not be scattered inside, and will be placed at a predetermined site.

FIG. 2 is a cross-sectional view when it is wound around an idler (not shown). The row of the steel cords 3 and the synthetic resin 5 are on the same plane, that is, both of them are bent. Is on the neutral plane PP, so that the winding resistance is small.

On the other hand, FIG. 3 shows a conventional rubber crawler in which the bias layer 6 made of nylon cord is embedded on the outer peripheral side of the steel cord 3, and this is wound by an idler (not shown). It is sectional drawing which shows the state at the time of hanging. However, in this rubber crawler, since the steel cord 3 becomes the neutral plane P-P with respect to the winding, the bias layer 6 arranged outside thereof is strongly pulled, and therefore the winding is performed. The resistance increases.

The feature of the rubber crawler of the present invention is that it exerts a great effect in terms of the winding resistance when it is wound around an idler or the like. Further, when a lateral force is applied to the rubber crawler during turning, the conventional rubber crawler having the bias layer 6 shown in FIG. 3 has some resistance to the lateral force. However, the synthetic resin layer 5 coated with the steel cord 3 in the present invention
Are much less effective than those that exist. This is also the case when a twisting force acts on the rubber crawler.

The steel cord 3 is embedded in the rubber elastic body 1 so as to surround the core metal 2 embedded in the rubber elastic body 1, but in some cases, Before embedding in a rubber elastic body, use a synthetic resin
It is possible to adhere not only the rucode but also the core metal integrally.

[0013]

The present invention provides a rubber cloth having the above structure.
Since the steel cord is a rubber, the steel cord is never scattered in the rubber elastic body, and even if a lateral force or a twisting force acts on the rubber crawler, the drag force that controls this Will have. Therefore, it is possible to prevent derailment between the wheel and the sprocket, and the resistance when wound around the idler is not so large, so that an efficient rubber crawler can be provided. is there. Furthermore,
Even if moisture penetrates into the rubber elastic body due to rubber breakage, the steel cord is covered with the synthetic resin layer, and therefore, there is an advantage that rust caused by moisture can be suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view of a rubber crawler of the present invention.

FIG. 2 is a cross-sectional view of the rubber crawler of the present invention wound around an idler.

FIG. 3 is a sectional view of a conventional rubber crawler wound around an idler.

[Explanation of symbols]

 1 ... Rubber elastic body, 2 ... Mandrel, 3 ... Steel code, 4 ... Lug, 5 ... Synthetic resin layer, 6 ... Bias layer.

Claims (2)

[Claims] 1. A rubber crawler comprising a steel cord as a tensile body embedded in an endless rubber elastic body in the longitudinal direction thereof, wherein the steel cords are arranged in rows. Be
Also, a rubber chlore characterized by coating the steel cord with a synthetic resin. 2. The rubber crawler according to claim 1, wherein an epoxy resin, a high molecular weight polyethylene, an ebonite, a urethane rubber or a polyamide resin is used as the synthetic resin.