JP4319262B2 - Rubber crawler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to an improvement of a rubber crawler used for traveling of a high-speed traveling vehicle, and more specifically, relates to a rubber crawler in which countermeasures against ear disconnection are taken.
[0002]
[Prior art]
Conventionally, rubber crawlers have been widely used in traveling parts of agricultural machinery and construction machinery, but in recent years, they have been mounted on the drive shafts of ordinary vehicles for high-speed travel. The rubber crawler used for high-speed running generally has no core metal or the like embedded in a rubber elastic body, and usually has a steel code and a bias code embedded in its longitudinal direction. A rubber protrusion having a constant pitch is provided at the center of the inner peripheral surface of the rubber track, and the rubber protrusion and the sprocket are engaged to transmit a driving force. Of course, a rubber lug is provided on the outer peripheral surface of the rubber track.
[0003]
Now, when such a rubber crawler is used for high-speed running, the end in the width direction, called the so-called ear part, of the rubber crawler tends to crack along the longitudinal direction of the rubber crawler, It may lead to cutting of the ear. This is called ear cutting, and this countermeasure is necessary.
[0004]
[Problems to be solved by the invention]
The present invention provides a countermeasure against the ear-breaking of a rubber crawler and is suitable for a rubber crawler mainly used for high-speed running, but it can be used for a rubber crawler that runs at a relatively low speed. Needless to say.
[0005]
[Means for Solving the Problems]
The present invention achieves the above-mentioned problems, and the gist of the present invention is that a reinforcing code layer is embedded in the longitudinal direction of the endless rubber elastic body without exceeding the width edge of the endless rubber elastic body. , together by forming a Gomuragu on its outer peripheral surface, Ri Na form a rubber protrusions sprocket is formed at a predetermined pitch in the center of the inner circumferential surface engages the driving force is transmitted, the vehicle running at a high speed A rubber crawler that is mounted and has a core metal not embedded in the endless rubber elastic body, and has a thickness that spans the width end edge of the reinforcing cord layer from the width end edge of the endless rubber elastic body It is applied to the rubber crawler in which the part is formed. Here, the reinforcing code layer is a steel cord layer embedded in the longitudinal direction of the endless rubber elastic body or a bias code layer embedded along the steel cord layer.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is a rubber crawler having the above-described configuration, which copes with the occurrence of the end of the rubber crawler, and is embedded in the rubber elastic body from the width end portion of the endless rubber elastic body. A thick portion is formed by covering the end portion of the steel code layer or the bias code layer, and copes with the ear cut by increasing the rigidity of the portion where the ear cut occurs.
[0007]
The cause of the occurrence of this ear breakage is that when the wheel runs at high speed, the wheel rotates while pressing the inner peripheral surface of the rubber crawler. When this is repeated at a high speed, it has been found that the ear part is bent particularly at the part where the reinforcing code layer is embedded and the part where the reinforcing code layer is embedded, and a crack occurs at this boundary, leading to the end of the ear. .
[0008]
Accordingly, in the present invention, the ear portion of the rubber crawler where the reinforcing code layer does not exist is made thicker than the thickness of the portion (main body portion) where the reinforcing code layer is embedded, and this thick portion Is dealt with by covering the end of the reinforcing cord layer. The reinforcing cord layer covered with the thick portion is preferably a steel cord layer that resists the tension applied to the rubber crawler, but when a plurality of layers are embedded in the rubber elastic body. It is sufficient that the thick part covers the layer closest to the width end.
[0009]
In addition, the thick part formed in the ear | edge part of this rubber crawler can be arrange | positioned either in the inner peripheral surface side or the outer peripheral surface side of a rubber crawler, and even if a thick part is formed in both sides depending on the case Good. And although it varies depending on the size of the rubber crawler, the planned running state, etc., the effect is remarkable by increasing the thickness of the rubber crawler main body to 10 mm or less, preferably about 1 to 5 mm. .
[0010]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
FIG. 1 is a plan view of the outer peripheral surface side of the rubber track of the present invention, FIG. 2 is a plan view of the inner peripheral surface side, and FIG. 3 is a side view. In the figure, reference numeral 1 is an endless rubber elastic body constituting a rubber crawler, 2 is a rubber lug, 3 is a rubber protrusion formed at a constant pitch in the center of the inner peripheral surface, and a sprocket (not shown) is connected to the rubber protrusion 3. It is of a structure that engages and transmits driving force. In the figure, reference numeral 4 denotes a low friction rod embedded in the rubber protrusion 3 in the lateral direction.
[0011]
4 is a cross-sectional view taken along the line AA, and FIG. 5 is an enlarged cross-sectional view of the main part. As can be seen from this cross-sectional view, a steel cord layer 5 is embedded in the longitudinal direction of the rubber elastic body 1, and in this example, the inclination angle is further reversed outside the steel cord layer 5, respectively. Bias code layers 6 ₁ and 6 ₂ are embedded. It goes without saying that the bias code layers 6 ₁ and 6 ₂ may be embedded inside the steel code layer 5.
[0012]
The size and driving system of the rubber crawler to which the present invention is applied are not particularly limited. However, the rubber crawler shown in the figure is an inner peripheral driving type, its width is 300 mm, and steelcoil. The code layer 5 is embedded in the center in the width direction with a width of 250 mm, and the bias code layers 6 ₁ and 6 ₂ are embedded in the center in the width direction with a width of 280 mm. Therefore, in this rubber crawler, the portions where the reinforcing cord layers (5, 6) are not present, that is, the ear portions 7, 8 are 10 mm from the width end.
[0013]
In the rubber crawler of the present invention, the thick portions 10 and 11 thicker than the main body portion 9 by 1.6 mm are formed between the lugs 2 and 2 on the outer peripheral surface side of the ear portions 7 and 8. The width is 30 mm including the rising slope. That is, the thick portion 10 and 11 also reinforce only thicker than the main body portion 9 co - formed so as to cover both the de layer 5,6 _1, 6 ₂ of the width end portion 5 _0, 6 _10, 6 ₂₀ It is a thing.
[0014]
【The invention's effect】
The rubber crawler of the present invention has the above-described configuration, and the boundary between the ear portion and the reinforcing cord layer in particular is not so conspicuous in shape, and the rigidity can be improved, and this structure is adopted. Even when this is subjected to high-speed running, the bending phenomenon of the ear is corrected, and the occurrence of the ear break is remarkably reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of an outer peripheral surface side of a rubber track according to the present invention.
FIG. 2 is a plan view of the inner peripheral surface side of FIG.
FIG. 3 is a side view of FIG. 1;
FIG. 4 is a cross-sectional view taken along line AA.
FIG. 5 is an enlarged cross-sectional view of a main part.
[Explanation of symbols]
1. Endless rubber elastic body,
2 ... Rubber lugs,
3 ... rubber protrusion,
4. Low friction bar material,
5 ... Steel code layer,
5 ₀ ... Width edge of steel cord layer,
6 ₁ , 6 ₂ ... Bias code layer,
6 ₁₀ , 6 ₂₀ ...... Bias code layer width end,
7, 8 ... ears,
9. Rubber rubber body,
10, 11 ... Thick part.

Claims (3)

A reinforcing code layer is embedded in the longitudinal direction of the endless rubber elastic body, and a rubber lug is formed on the outer peripheral surface without exceeding the width edge of the endless rubber elastic body. sprockets are formed at a constant pitch in the center is engaged in Ri Na to form a rubber projections driving force is transmitted, is mounted to a vehicle running at a high speed, metal core is embedded in the endless rubber elastic body No rubber crawler,
A rubber crawler characterized in that a thick portion is formed so as to straddle the width end edge of the reinforcing cord layer from the width end edge of the endless rubber elastic body.   2. A rubber crawler according to claim 1, wherein the reinforcing cord layer is a steel cord layer embedded in the longitudinal direction of the endless rubber elastic body.   2. A rubber crawler according to claim 1, wherein the reinforcing cord layer is a bias cord layer embedded in the longitudinal direction of the endless rubber elastic body.

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