JPH0558358A - Structure of rubber crawler and running device - Google Patents

Abstract

PURPOSE:To provide the structure of a rubber crawler and a running device for the crawler which is reduced in weight and reduces the generation of lateral displacement and a twist. CONSTITUTION:A rubber crawler comprises an endless rubber resilient substance 1, cores 2 embedded at a specified pitch in the direction of width, and steel cords 4 longitudinally embedded in a manner to be surrounded from the outside. In the rubber crawler, bias cords 8 are embedded in one row-form manner at an inclination angle laterally symmetrically about a central part in the direction of width. The bias cord is a steel cord, the bias cords are embedded in a one row-form manner without allowing any contact between the cords and embedded at an inclination angle of 20-60 deg. in the direction of width.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler structure and a traveling device, and more particularly to a rubber crawler structure and a traveling device thereof which are light in weight and have reduced lateral displacement and twist. is there.

[0002]

2. Description of the Related Art In recent years, rubber crawlers have come to be widely used as traveling devices for construction machinery and civil engineering work machines, including traveling devices for agricultural machinery. However, the rubber crawler used here is a traveling device that is wound around a sprocket, an idler, and a large number of rolling wheels arranged therebetween, and its structure is endless rubber elastic. A cored bar laterally arranged in the width direction is embedded in the body at a constant pitch, and a steel cord, which is a tensile body, is embedded in the longitudinal direction so as to further surround the cored bar from the outer peripheral side.

A rubber lug is formed on the outer peripheral surface, and a pair of corners extending from the core bar project on the inner peripheral surface, which exerts a wheel removal preventing function of a rolling wheel (not shown).
Alternatively, it becomes the rolling surface of the rolling wheel. Further, generally, a sprocket engaging hole is formed between adjacent cores, and the central part of the core serves as an engaging part with the sprocket.

[0004]

However, the rubber black
When traveling on a sloping ground using the vehicle as a traveling device, riding on a convex portion of the road surface, or when making a sharp turn, the rubber crawler is fixed to the road surface and the aircraft tends to move relatively. I cannot avoid becoming. That is, the rubber crawler and the machine body cause a relative displacement in the lateral direction.
This is a characteristic that the entire rubber crawler is composed of an elastic body, and in preventing lateral displacement, it depends on the strength of the rubber elastic body and especially the steel cord embedded therein. It will be.

Further, in the portion wound around the sprocket and the idler, only the central portion in the width direction of the rubber crawler is supported, and the width edge is not supported, and this edge portion is the inner side. There is a tendency for it to bend, and this also comes into contact with the airframe frame. This also depends on the strength of the rubber elastic body and the core metal embedded therein.

In this regard, the present applicant has already provided an improved rubber crawler in Japanese Utility Model Laid-Open No. 2-110592. However, although such an invention is an excellent invention that basically achieves its object, the thickness of the rubber crawler is increased because at least two cross-bias code layers are embedded in the rubber elastic body. However, since the cord material is used in a large amount, there are drawbacks such as an increase in the total weight. Although the purpose of increasing the lateral rigidity and the torsional rigidity of the rubber crawler can be achieved, in order to give proper lateral rigidity and the like in consideration of the usage condition, the cross bias coil
There were some difficulties with the technique of burying a cable.

The present invention is intended to improve the drawbacks of the conventional rubber crawlers. By arbitrarily controlling the degree of rigidity of the rubber crawlers, especially in the width direction, the rubber crawlers can be controlled. It is intended to reduce the lateral displacement and the occurrence of bending and twisting of the width edge.

[0008]

The present invention adopts the following means in order to achieve the above object. That is, the gist of the present invention is to provide an endless rubber elastic body, a cored bar embedded at a constant pitch in the width direction, and a steel cord which is surrounded by the cored bar and embedded in the longitudinal direction thereof. According to the structure of the rubber crawler, the bias cords are embedded symmetrically from the center in the width direction to the left and right and in a row at an inclination angle. Preferably, the bias code is a steel code,
The cords are buried in a row without contacting each other, and are buried at an inclination angle of 20 to 60 ° with respect to the width direction. The buried position is generally the bias code and the steel cord. It is located outside of the door and is buried. In addition, by enclosing the tip of the bias cord with the fiber layer, the durability of the rubber crawler is dramatically improved.

In the rubber crawler traveling device, it is preferable to use the rubber crawler with directivity, and the endless rubber elastic body, the cored bar embedded at a constant pitch in the width direction, and the core bar. In a rubber crawler consisting of a steel code which is surrounded by a core metal and is embedded in the longitudinal direction of the core metal, bias cords are embedded in a row in a line symmetrically from the center in the width direction to the left and right. A rubber crawler characterized by being arranged such that the tip end side of the central portion of the bias cord inclined and embedded in the rubber is wound around the sprocket provided in the machine body first. The present invention provides a rubber crawler traveling device.

The bias code used here is
Generally, a steel cord in which a plurality of wires are twisted together is used, but this may be a single wire having an appropriate diameter,
In some cases, it may be organic or inorganic, for example polyester or polyamide fiber cord. Usually, these cords are arranged in a line without coming into contact with each other and are so-called woven with a wide interval between them, and in this state, the unvulcanized rubber sheet is vulcanized from above and below.
Is coated. Then, the cord coated with rubber is cut at a desired angle and embedded in the rubber.

[0011]

According to the present invention, the bias cords are embedded in a row at a predetermined inclination angle with respect to the width direction of the rubber crawler. .. That is, it is possible to control the lateral rigidity of the rubber crawler by changing the thickness, length, inclination angle, etc. of the bias cord, and the bias cord is made of a single layer in a row, so that the number of materials is small. The cost was reduced, and further, the purpose was able to be achieved without significantly increasing the weight of the rubber crawler.

In the above-mentioned invention proposed by the present applicant, two code layers in which the code intersects the bias are superposed and embedded in the rubber. It has been found that the effect of the burying can be expressed by the fact that the number of layers is increased, and not only the effect of merely increasing the number of layers, but also the lateral rigidity and the like are dramatically facilitated by the rubber layer. The LA itself has contributed to the reduction in cost and weight.

Further, in the above-mentioned invention, since the two bias code layers are superposed in the rubber, the cords between the layers often come into contact with each other, and the durability of the rubber crawler is improved. Although there was some influence, in the present invention, since this is a single layer, there is no such drawback, and the improvement in this respect also makes a great contribution as an improvement in practical use.

In particular, in the present invention, when the tip row of the bias cord is surrounded by a fiber layer such as a woven fabric and embedded in rubber, generation of cracks in the rubber due to the behavior of the tip is prevented. Therefore, the durability of the rubber crawler can be further improved.

The portion of the bias cord embedded in the rubber includes the inside of the core metal, the space between the core metal and the steel cord, the outside of the steel cord, and the like. It is embedded on the outer side of the rucor, that is, between the steel cord and the rubber lug formed on the outer peripheral surface. In particular, the thickness of the rubber layer is small between the cored bar and the steel cord, and embedding the bias cord between them has a certain merit but requires careful manufacturing technology. On the other hand, when it is embedded inside the cored bar or outside the steel code, it is relatively easy to manufacture, and in this case, even if a crack or the like occurs in the rubber, this bias coded surface is used. The growth of cracks is prevented, and for example, the water that causes the generation of rust is not limited to the core metal and the steel cord, and as a result, it also contributes to the improvement of the durability of the rubber crawler. ..

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below more specifically with reference to the drawings. FIG. 1 is a cross-sectional perspective view of the rubber crawler of the present invention, and FIG. 2 is a partially cutaway plan view of the rubber crawler viewed from the inner peripheral surface. In the figure, 1 indicates a rubber crawler,
Reference numeral 2 designates a cored bar which is laterally arranged and embedded in a rubber elastic body which constitutes the rubber crawler 1. A pair of corners 3 are formed on the core metal 2, and this is a rubber crawler 1.
Projecting from the inner peripheral surface. A steel cord 4, which is a tensile body, is embedded in the rubber crawler 1 so as to surround the cored bar 2 from the outside in an endless manner in the longitudinal direction of the rubber crawler 1. In the figure, reference numeral 5 is a sprocket engaging hole, and this engaging hole 5
Is divided by the central portion 6 of the core metal 2, and the central portion 6 of the core metal 2 is an engaging portion with a sprocket (not shown). Further, reference numeral 7 is a rubber lug formed on the outer peripheral surface of the rubber crawler 1.

The bias cord 8 made of a steel cord is a tensile cord 4 and a rubber lug 7.
It is embedded in the rubber between and in a row, and as can be seen in the figure, it is embedded at an angle A with respect to the width direction X of the rubber crawler 1. Of course, the bias code 8 is symmetrically embedded in the widthwise direction of the rubber crawler 1. This angle A is within the specific range as described above. If the angle A is small, it does not contribute so much to the increase of the lateral rigidity of the rubber crawler 1, and if the angle A is too large, the sprocket and idler are moved. It is not preferable because the resistance when wound around becomes too large. As described above, according to the present invention, the bias code 8 is embedded symmetrically in the width direction of the rubber crawler 1 with the angle A, and the inclination angle A is set according to the intended use of the rubber crawler. The material of the bias cord 8 is selected to improve the lateral rigidity and the torsional rigidity of the rubber crawler. In the figure, 9 _{1 to} 9 ₄ are rubber layers.

And, preferably in the longitudinal direction of the rubber crawler 1, the rubber crawler 1 is pulled in the Y direction.
The traveling device is preferably equipped with a sprocket for applying propulsive force to the vehicle. That is, in relation to the propulsive force from the sprocket, it is preferable that both side tips of the bias cord 8 receive the force from the center. Note that tensile member is a steel - the width W ₁ of de 4 (mm), Baiasuko - - Turkey is de steel - Turkey - width of de 8 W ₂ (mm)
Is generally W ₁ <W ₂ , and preferably W ₁
<W ₂ <W ₁ +20 (mm). And the stee
It is preferable that the width W _{2 of the} rucode 8, that is, the tip of the steel code 8 is embedded with a protrusion within 10 mm from both sides of the width W ₁ of the steel code 4. The presence of the protruding portion of the tip of the steel cord 8 contributes to the improvement of lateral rigidity and torsional rigidity.

In the figure, reference numeral 10 is a woven fabric made of polyamide fiber, which surrounds the tip of the steel cord 8. The woven cloth 10 is formed by bending a material coated with unvulcanized rubber up and down to surround the tip of the steel code 8. The tip of the steel cord 8 has a function of jumping up when it is wound around a sprocket or an idler, and therefore, a woven cloth 10 is provided at the tip to prevent this. Needless to say, the anti-curve body 8 of the present invention does not prevent the anti-curve body 8 from being used in combination with another reinforcing material.

[0020]

The present invention is directed to a rubber black having the above-mentioned structure.
And its traveling device, the lateral rigidity, the torsional rigidity, and the winding resistance can be selectively controlled with a considerable degree of freedom depending on the intended use of the rubber crawler. Despite the addition of the characteristics, it is possible to obtain a rubber crawler having a simple structure and a light weight, and its industrial value is high.

[Brief description of drawings]

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

FIG. 2 is a partially cutaway plan view seen from the inner peripheral surface of the rubber crawler.

[Explanation of symbols]

1 ······························································································ items for sprocket parts 6 ············································································ Rubber lugs // ··· -Do 9 _{1 to} 9 ₄ ... Rubber layer 10 ... Woven fabric W ₁ ... Width of tensile body W ₂ ... Bias code width

Claims (6)

[Claims] 1. An endless rubber elastic body, a cored bar embedded at a constant pitch in the width direction, and a steel cord which is surrounded by the cored bar and is embedded in the longitudinal direction thereof. A structure of a rubber crawler, wherein bias cords are embedded in a row in a row symmetrically from the center in the width direction to the left and right, with an inclination angle. 2. The structure of a rubber crawler according to claim 1, wherein the bias code is a steel code, and the code is buried in a line without contact between the cords. 3. The bias code is 20 to 6 in the width direction.
The structure of the rubber crawler according to claim 1, wherein the structure is embedded at an inclination angle of 0 °. 4. The structure of the rubber crawler according to claim 1, wherein the bias cord is located outside the steel cord and is embedded therein. 5. The rubber crawler structure according to claim 1, wherein the tip of the bias cord is surrounded by a fiber layer. 6. An endless rubber elastic body, a cored bar embedded at a constant pitch in the width direction, and a steel cord which is surrounded by the cored bar and is embedded in the longitudinal direction thereof. In the rubber crawler, the bias cords are embedded symmetrically from the center in the width direction to the left and right and in a row at an inclination angle. A rubber crawler traveling device arranged such that the tip end side of the central portion of the bias code which is inclinedly embedded therein is wound around first.