JP4395208B2 - Structure of rubber track - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for improving the durability of a rubber crawler in which a core metal and a steel cord are embedded.
[0002]
[Prior art]
In recent years, rubber crawlers have been widely used as traveling units for civil engineering machines and construction machines. In the rubber crawler, the core bar is normally embedded in the rubber in the width direction with respect to the running direction, and the steel cord surrounds the outside of the core bar. The end portion of the rubber plate becomes an edge, and the rubber portion is cracked to shorten the life as a rubber crawler. For this reason, a proposal has been made to prevent the occurrence of cracks by warping the end portion of the core bar in the width direction to the inner peripheral side, thereby increasing the thickness of the outer peripheral rubber.
[0003]
[Problems to be solved by the invention]
The present invention has been developed in order to more effectively achieve the problems of the improved rubber crawler, and it is intended to further improve the life of the crawler.
[0004]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and the gist of the present invention is a rubber elastic body and a core metal embedded in the rubber crawler in the width direction with respect to the traveling direction of the rubber crawler. A steel cord embedded in the outer periphery of the wing of the cored bar, a rubber lug formed on the outer peripheral surface of the rubber elastic body, and a rubber formed by bending the width end of the cored bar toward the inner peripheral side In the crawler structure, the end portion in the width direction of the steel cord is positioned inward in the width direction with respect to the bending position of the core bar, and the outer peripheral side end portion of the plane in the width direction end portion of the rubber crawler is from the outer peripheral side surface of the core bar. Is also positioned on the outer peripheral side, and the angle α of the counter part relative to the horizontal position of the outer peripheral side surface of the cored bar is set to 15 to 40 degrees, and the rubber corresponding to the counter part of the width end of the cored bar cladding protruding on the inner circumferential side to the inner peripheral side of the end portion in the width direction of the crawler Forming a said at the overlaid portion has a width end of the metal core is embedded in the cladding portion covering the anti-section, characterized in that. If the angle α is smaller than 15 degrees, the effect of preventing the ear bend deformation is small. On the other hand, if the angle α is larger than 40 degrees, interference with the aircraft tends to occur.
[0005]
In general, a built-up portion is formed continuously or intermittently on the inner peripheral side at the end portion in the width direction of the rubber crawler corresponding to the opposite portion of the cored bar. In addition, the angle α of the opposite portion is preferably 20 to 35 degrees.
Further, the thickness from the steel cord on the outer side in the rubber crawler width direction to the outer surface of the rubber crawler can be set to be thicker than the thickness from the steel cord on the center side in the rubber crawler width direction to the outer surface of the rubber crawler. .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the proposed rubber crawler, although the opposite end is formed on the inner circumferential side of the width end of the core bar, the positional relationship with the plane of the end in the width direction of the rubber crawler is almost considered. It wasn't. Therefore, in some cases, the rubber part may be cracked toward the end part of the cored bar, although the opposite part is added to the end part of the cored bar.
[0007]
In order to investigate this phenomenon, the occurrence of cracks is reduced by forming the opposite portion at the width end of the core metal. However, when a crack occurs here, it continues to the flat portion and the rubber lug at the width end of the crawler. It turns out that a crack enters toward the opposite end of the core bar width centering on the connecting part with the inclined surface, especially when the position of the connecting part is on the inner peripheral side from the outer peripheral surface of the core metal. It was analyzed that the amount of rubber between the end of the core and the opposite end of the metal core decreases, so that the strain concentrates here and cracks occur.
[0008]
The occurrence of such cracks in the rubber crawler is caused especially when the width end of the crawler steps on the curb or the ore or the like that is buried in the travel path and the tip is exposed. This is dealt with by increasing the amount of rubber at the width end, but more effectively, the end of the cored bar is located as far as possible from the stone on the road, etc. It has been proposed to warp the end toward the inner periphery.
[0009]
In the present invention, a measure is taken to increase the amount of rubber in a portion where cracks are likely to occur, and the outer peripheral side end of the flat portion of the width end of the rubber crawler is positioned on the outer peripheral side of the outer peripheral surface of the cored bar. Thus, the amount of rubber between the end of the core bar opposite to the end of the rubber track in the width direction is increased.
[0010]
【Example】
Hereinafter, the rubber crawler of the present invention will be described in more detail with reference to the drawings.
1 is a plan view of the inner periphery of a rubber crawler as a first example of the present invention, FIG. 2 is a plan view of the outer periphery of the rubber crawler of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA. . In the figure, reference numeral 1 denotes a rubber elastic body, which is continuous in the vertical direction of the paper in FIG. Reference numeral 2 denotes a cored bar embedded side by side in the rubber elastic body 1. 3 is a rubber lug on the outer peripheral side of the cored bar 2. In this example, a steel cord 4 is embedded in the rubber elastic body 1 so as to surround the metal core 2.
[0011]
Now, the core 2 of the rubber crawler of the present invention is formed by bending its both width ends toward the inner peripheral side to form a counter part 5, and along with the counter part 5, an inner peripheral end part of the rubber elastic body 1 is formed. A built-up portion 6 is formed to cover the opposite portion 5. In particular, the end 8 on the outer peripheral side of the flat portion 7 in the vertical direction at the width end of the rubber elastic body 1 is arranged (P2) on the outer peripheral side of the horizontal position P1 on the outer peripheral side surface of the cored bar 2. In this way, the portion where the cracks concentrate at the width end portion of the rubber elastic body 1 is moved away from the width end of the cored bar to increase the rubber thickness. Reference numeral 9 denotes an inclined surface at the width end of the rubber lug 3.
[0012]
In the present invention, the left and right width ends of the cored bar 2 are formed as a counter part 5 of about 30 degrees on the inner peripheral side, and correspondingly, a built-up part 6 is connected in the longitudinal direction. Yes. And the outer peripheral side edge part 8 of the plane part 7 in the right-and-left end of the rubber elastic body 1 is arrange | positioned further to the outer peripheral side P2 rather than the horizontal position P1 of the outer peripheral surface of the metal core 2. As shown in FIG.
[0013]
As shown in this example, in the crawler of the present invention, the width end of the cored bar is bent to the inner peripheral side to form a reverse portion, and the outer peripheral side end portion in the flat portion of the width end of the rubber crawler Is positioned farther from the position of the outer peripheral surface of the cored bar, and the distance between the end of the opposite part of the cored bar and the outer peripheral side end of the flat part is arranged farther away, and the rubber thickness is increased accordingly. This is an enlarged one that prevents the occurrence of cracks from this part.
[0014]
【The invention's effect】
The present invention reduces the occurrence of cracks at the end of the core of the rubber track, and significantly improves the life of the rubber track.
[Brief description of the drawings]
FIG. 1 is a plan view of an inner peripheral side of a rubber track as a first example of the present invention.
2 is a plan view of an outer peripheral side of the rubber crawler of FIG. 1. FIG.
FIG. 3 is a cross-sectional view taken along line AA.
[Explanation of symbols]
1. Rubber elastic body,
2 ... Core metal,
3 ... rubber lugs,
4 ... Steel code,
5. The opposite part of the core,
6 ... the build-up part,
7. The flat part at the width end of the rubber elastic body,
8 ... the end on the outer peripheral side of the flat part,
9... Rubber lug wide end inclined surface,
P1: Horizontal position of the outer peripheral side surface of the cored bar,
P2 ... Horizontal position of the outer edge of the flat part,
α: Angle of the opposite part of the core.

Claims (3)

A rubber elastic body, a core metal embedded in the rubber crawler in the width direction with respect to the traveling direction of the rubber crawler, a steel cord embedded in the core and surrounding the wing portion of the core metal, and a rubber elastic body In the structure of the rubber crawler formed by bending the rubber lug formed on the outer peripheral surface and the width end of the core metal to the inner peripheral side to form the opposite portion,
The width direction end of the steel cord is positioned on the inner side in the width direction than the bending position of the cored bar,
The outer peripheral side end of the flat surface of the rubber crawler in the width direction is positioned on the outer peripheral side with respect to the outer peripheral side surface of the cored bar,
While setting the angle α of the counter part relative to the horizontal position of the outer peripheral side surface of the cored bar to 15-40 degrees,
In response to anti-section of width ends of the metal core to form a cladding portion which projects to the inner peripheral side to the inner peripheral side of the end portion in the width direction of the rubber crawler, the covering the anti-parts in the overlaid portion A structure of a rubber crawler, wherein a width end of a core metal is embedded in the built-up portion .   The rubber crawler structure according to claim 1, wherein the angle α is set to 20 to 35 degrees.   The thickness from the steel cord on the outer side in the rubber crawler width direction to the outer surface of the rubber crawler is set to be thicker than the thickness from the steel cord on the middle side in the rubber crawler width direction to the outer surface of the rubber crawler. The structure of the rubber crawler according to claim 1 or 2, characterized by the above.

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