JP2002002563A - Rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber crawler with a flat part having a rubber thickness in the area ranging from the core bottom part of the portion near the center part of the rubber crawler to the outer surface of the rubber crawler formed thicker than the thickness of the end part thereof so as to improve the durability against tearing of the rubber at the severely damaged center part. SOLUTION: In this endless rubber crawler, cores are longitudinally arranged parallel with each other at a specified pitch, and steel chord rows are buried in therein so as to surround the outer side of the cores. The thickness of the rubber in the area ranging from the bottom part of the cores to the outer surface of the rubber crawler is formed in two stages in the inside width of the lateral projected area of the cores in plan view. The thickness of the steel chord rows at the portion near the center part thereof is formed thicker, and the portion near the end part thereof is formed thinner.

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 under severe operating conditions such as construction machines.

[0002]

2. Description of the Related Art In recent years, rubber crawlers have been widely used in construction machines and the like. However, in many cases, unevenness and sharp protrusions are scattered on a running road surface and a working ground. Rubber crawlers in such severe conditions are peeled off due to cuts and fatigue, exposing the inner steel cords, causing the steel cords to be cut. In such a portion, since the strain concentrates on the core metal buried in the rubber crawler and the steel cord row particularly present inside the steel cord row, the core metal projection area width in the width direction of the rubber crawler and the vicinity thereof. It has been found that the rubber can cause cuts and missing rubber.

[0003] For this reason, conventionally, this problem has been dealt with by increasing the thickness of the rubber between the bottom of the cored bar and the outer surface of the rubber crawler. However, since the entire rubber crawler becomes thicker and the amount of rubber used increases, the cost is reduced. Although the steel cord row embedded in the rubber crawler becomes the center of bending, the outer surface of the rubber crawler is far from this bending center, so bend it with the sprocket and idler around the foot. Distortion increases when it is received, and cuts and cracks are more likely to occur. Further, since the lug height is relatively reduced, it is necessary to increase the lug height and the cost increases. was there.

FIG. 6 shows an example of a conventional rubber track.
Although the outer surface 6 of the rubber crawler 10 has a substantially flat shape as shown in FIG. 1, since the load from the machine body tends to concentrate on the central portion, the effect on the cut flaws and the phenomenon that the rubber is peeled off at this portion is not significant. Low. In the drawing, reference numeral 1 denotes a cored bar, 2 denotes a steel cord row surrounding the outside of the cored bar, 3 denotes a rubber elastic body forming a base of a rubber crawler, 4 denotes a lug, and 5 denotes a sprocket engagement hole.

[0005]

According to the present invention, a flat portion in which the rubber thickness from the bottom of the core metal near the center of the rubber crawler to the outer surface 6 of the rubber crawler is made thicker than that of the end portion is provided. This is an improvement in the durability of the central portion of the rubber against peeling of the rubber.

[0006]

The gist of the present invention is to provide an endless rubber crawler in which metal cores are arranged side by side at a constant pitch in the longitudinal direction, and a steel cord row is embedded around the metal cores around the metal cores. There are two levels of thickness from the bottom of the core bar to the outer surface of the rubber crawler in the projection area width in the width direction of the core bar in plan view, and the thickness of the portion near the center of the steel cord row is thicker and closer to the end. The thickness of the portion is reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the present invention relates to the improvement of a portion where distortion is concentrated, and the device is made by devising a portion of the outer surface of a rubber crawler, in particular, where a cut flaw or a lack of rubber occurs. In order to protect and reinforce this part, the thickness from the bottom of the core metal to the outer surface of the rubber crawler is set in two steps in the width of the projected area in the width direction of the core, and the thickness of the part near the center of the steel cord row And the thickness near the end is reduced. Needless to say, the thickness of the rubber can be three or more.

The width W of the portion where the thickness of the rubber is increased
0 is the total width of the rubber track (excluding the sprocket hole)
W is 1/2 to 1/4 of W, and its thickness T0 generally depends on the size of the rubber crawler.
It is about 2 to 10 mm thicker. The portion where the thickness of the rubber is increased forms a flat portion, which prevents concentration of distortion, thereby particularly improving the durability of the rubber crawler.

[0009]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples. FIG. 1 is an external plan view of a rubber track 10 of the present invention, FIG. 2 is a side view, and FIG. 3 is a cross-sectional view taken along line AA.
In the figure, reference numerals 1 to 6 are the same as those in FIG. 6, and the description is omitted here. The rubber crawler 10 has a flat portion 7 in which the thickness T0 of the rubber at the center of the outer surface 6 (excluding the sprocket engagement hole 5) is 5 mm thicker than the thickness T of the left and right side surfaces. The flat portion 7 has two protrusions on the outer surface of the rubber crawler 10 with the sprocket engagement hole 5 interposed therebetween in the longitudinal direction. Thereby, the steel cord row 2a located on the inner side where the greatest force of the steel cord row 2 is expected to be applied is covered by the flat portion 7.

In the rubber crawler 10 according to the present invention, since the above-mentioned structure is employed, the rubber portion where cuts are frequently generated can be made thicker to disperse the strain applied to the rubber. Things. In this example, the flat portion 7 is formed by increasing the thickness of the rubber to half the position of the steel cord row 2. Of course, it is needless to say that the outer surfaces of the thin portions of the left and right rubbers are preferably made as flat as possible from the viewpoint of dispersion of force.

FIG. 4 is an external plan view of another example of the rubber track 10 of the present invention. In this example, the lugs 4 are each arranged in an inclined manner, and furthermore, are shifted in a zigzag manner on the left and right in the width direction. This is also provided with a thick flat portion 7 between the lugs 4,4.

FIG. 5 is a sectional view similar to FIG. 3 showing still another example of the rubber track 10 of the present invention. In this case, the rubber crawler 10 corresponding to the rubber thick portion (flat portion 7)
The concave portion 7a is formed on the inner peripheral surface of the rubber crawler to reduce the weight and balance the rubber crawler.

[0013]

The rubber crawler according to the present invention has a flat portion in which the rubber thickness from the bottom of the core metal near the center of the rubber crawler to the outer surface of the rubber crawler is larger than that of the end of the rubber crawler. This provides a rubber track with excellent durability, which covers a severely damaged portion with this.

[Brief description of the drawings]

FIG. 1 is an outer plan view of a rubber track of the present invention.

FIG. 2 is a side view of the rubber track of FIG. 1;

FIG. 3 is a cross-sectional view of the rubber track of FIG. 1 taken along line AA.

FIG. 4 is an outer plan view of another example of the rubber track of the present invention.

FIG. 5 is a sectional view of the same portion as FIG. 3 in still another example of the rubber track of the present invention.

FIG. 6 is a sectional view similar to FIG. 3 of a conventional rubber track.

[Explanation of symbols]

 1 ‥ Core bar, 2,2a ‥ Steel cord row, 3 ‥ Rubber elastic, 4 ‥ Lug, 5 ‥ Sprocket engagement hole, 6 ‥ Outer surface of rubber crawler, 7 ‥ Flat portion with increased rubber thickness, 7A {Recessed part, 10} Rubber track.

Claims (3)

[Claims] 1. An endless rubber crawler in which metal cores are arranged side by side at a constant pitch in a longitudinal direction, and a steel cord row is embedded around the metal cores, and the width of the metal cores in a plan view. In the projection area width in the direction, the thickness from the bottom of the core metal to the outer surface of the rubber crawler is set to two levels, the thickness near the center of the steel cord row is increased, and the thickness near the end is reduced. And a rubber crawler. 2. The width W0 of the portion where the thickness of the rubber is increased is
The width of the rubber track is 1/2 to 1/4 of the total width W of the rubber track.
The described rubber track. 3. The thickness T0 of a portion where the thickness of rubber is increased.
2. The rubber crawler according to claim 1, wherein the thickness of the rubber track is 0.5 to 10 mm thicker than the rubber thickness T of the other portion.