JP2002321668A - Rubber crawler traveling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber crawler traveling device capable of improving the service life of the rubber crawler. SOLUTION: In the rubber crawler traveling device in which the rubber crawler is wound and stretched between a sprocket and an idler, the rubber crawler comprises a long elastic body and a steel cord row embedded in the longitudinal direction thereof, and both ends of the steel cord row are joined with each other in an overlapping manner, and a tip on the outer circumferential side of the overlapped part of the steel cord row is wound and stretched backward in the main rotational direction of the rubber crawler. In the figure, denoted are; a: a projecting V-shaped part, b: a recessed V-shaped part, B: the rotating direction, S: the steel cord row, Sa: the steel cord row on the outer circumferential side of the overlapped part, and Sb: the steel cord row on the inner circumferential side of the overlapped part, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling device for a rubber track, and more particularly to an improvement in the life of the rubber track.

[0002]

2. Description of the Related Art In a conventional rubber crawler, a steel cord row is usually embedded in a long rubber elastic body along its longitudinal direction, and furthermore, a steel cord row protruding from both ends is overlapped and joined. Endless rubber crawler.

Considering the stress (γ) applied to the rubber material between the steel cord rows at the overlapped portion, the stress (γ1) caused by the tension applied to the rubber crawler, and the bending stress (γ) applied when wound between the sprocket and the idler.
2) and the stress (γ3) due to the deformation caused by raising the tip of the steel cord row. However,
γ1 is almost constant, and changes greatly between γ2 and γ3.
In particular, γ2 and γ3 increase rapidly when bent by a sprocket and an idler. In particular, if the rubber cord is broken by the rising edge of the end of the steel cord row, the rubber crawler may be broken. Therefore, it is necessary to prevent rubber breakage caused by the rising edge of the steel cord row.

[0004]

SUMMARY OF THE INVENTION The present invention provides a rubber crawler traveling device in which the tip of a steel cord row in a rubber crawler is prevented from rising, and a rotation direction of the rubber crawler and an overlapping portion of the steel cord row. The present inventors have scrutinized the relationship between the present invention and the present invention.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the gist of the present invention is that a rubber crawler is wound around a sprocket and an idler and is used for traveling. The rubber crawler according to the present invention is a rubber crawler comprising a long elastic body and a steel cord row buried along the longitudinal direction, and joined by overlapping both ends of the steel cord row, The present invention relates to a traveling device for a rubber crawler, wherein the outer periphery of the superposed portion of the steel cord row is wound backward with respect to the main rotation direction of the rubber crawler.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has been invented based on the result of closely examining the occurrence of the rise of the end of a steel cord row of a rubber crawler in a rubber crawler traveling device. On the other hand, when it is bent by the idler located on the front side and touches the ground, or when it is released from the ground by the sprocket located on the rear side in the running direction, it has been found that the tip of the steel cord row breaks the rubber crawler, Is reduced.

That is, the tip of the steel cord row that breaks the rubber crawler is based on the finding that the tip that faces forward in the rotation (running) direction mainly breaks the rubber crawler. The front end of the steel cord row facing forward is covered with a steel cord row on the other side from the outer peripheral side.

[0008] In other words, the outer peripheral end of the superposed portion of the steel cord row is disposed so as to face backward with respect to the traveling direction, so that even if γ2 and γ3 of the rubber crawler increase rapidly, The rise of the front end of the steel cord row positioned forward with respect to the traveling direction is suppressed by the steel cord row located on the outer peripheral side. As a result, γ3 with respect to the rubber interposed therebetween is reduced, so that the separation between the rubber and the steel cord row is reduced, and the occurrence of the projection of the steel cord row from the rubber crawler is reduced.

[0009]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples. A rubber crawler was manufactured with the structure shown in FIG.
That is, the tip of the steel cord row S is cut into a V-shape, one of which is convex (a) and the other is concave (b). Obtained. In such a structure, by forming the overlapping portion with the V-shaped projections a and b, it is possible to prevent the bending rigidity from being sharply increased at the overlapping portion, and therefore, the steel at the overlapping portion is prevented. It is possible to further prevent the leading end of the code string from rising. Note that the present invention is not limited to such a configuration, and the steel cord row may be cut at a right angle to the running direction.

[0010] Then, the rubber track with improved bending rigidity was wound around two pulleys, and the peel length was measured. The test conditions were tension 270k between pulleys.
g, pulley diameter 120 mm, length 95 mm of overlapped portion W of steel cord row S, pulley rotation speed 500 rpm
m.

The test was performed by rotating the rubber track in both forward and reverse directions. That is, the relationship between the number of times of bending and the peel length was measured for the rotation direction A and the rotation direction B (the rotation direction of the present invention). FIG. 2 shows the measurement results. The peel length refers to the length from the outer peripheral end of the superposed portion of the steel cord row to the portion of the peeled portion extending from the superposed portion where the peeling has progressed most.

As can be seen from FIG. 2, in the rubber track in the rotation direction A, the outermost steel cord row tip Sa is located forward and outward with respect to the rotation direction. There is nothing to suppress the rise, and therefore the phenomenon of the rise is large (arrow X), the length of peeling becomes large, and the life of the rubber crawler is greatly affected.

On the other hand, in the traveling direction of the rubber crawler in the rotation direction B, ie, the rubber crawler of the present invention, the tip Sb of the steel cord in the rotation direction is located on the inner peripheral side of the rubber crawler, and this is the steel cord Sa on the outer peripheral side. As a result, the rising (arrow Y) is prevented, and it has been found that the peel length is also small.

[0014]

As described above, according to the present invention, the steel cord can be prevented from rising up by positioning the rear end of the steel cord with respect to the rotation direction of the rubber track on the outer peripheral side. Thus, a rubber crawler traveling device having a long life can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an arrangement diagram of a steel cord in a rubber track.

FIG. 2 is a graph showing measurement results.

[Explanation of symbols]

 a ‥ convex V-shaped portion at the end of the steel cord row, b ‥ concave V-shaped section at the tip of the steel cord row, B ‥ rotation direction of the present invention, S ‥ steel cord row, Sa ‥ steel on the outer peripheral side of the overlapped portion Code line, Sb ‥ Steel code line on the inner peripheral side of the overlapped portion, X, Y ‥ Rise up of the end of the steel code line.

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[Procedure amendment]

[Submission date] August 19, 1999 (1999.8.1
9)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (1)

[Claims] The present invention relates to a rubber crawler traveling device in which a rubber crawler is wound around a sprocket and an idler and used for traveling. The rubber crawler is a long elastic body and a steel cord embedded along the longitudinal direction. A rubber crawler comprising a row of steel cords and joined by overlapping both ends of the steel cord row, the outer periphery of the superposed portion of the steel cord row being wound backward with respect to the main rotation direction of the rubber crawler. A running device for a rubber track.