JP2005001432A - Rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To disperse distortion occurring at the left and right ends of a core metal by forming protrusions on the outer peripheral surface of a rubber elastic body corresponding to the left and right ends of the core metal where a lug cut occurs, and to impart a function of preventing the occurrence of cracks in rubber by forming the left and right ends of the protrusions into inclined surfaces to make a movement running on a curbstone slide off easily. <P>SOLUTION: The rubber crawler consists of the endless rubber elastic body, the core metal, a main cord, and lugs formed in the outer peripheral surface. In the outer peripheral surface of the rubber elastic body corresponding to the left and right ends of the core metal, the protrusion straddling the front and rear lugs is formed. The symbols in the figure represent: 1,the rubber elastic body; 2,the core metal; 2a,the wing section of the core metal; 3,the main cord; 4,the lug; 4a,the inclined plane of the lug; 4b,the height of the lug; 10,the protrusion; 10a,the inclined surface of the left and the right end of the protrusion; 10c,the height of the protrusion; and 10d,the top of the protrusion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the structure of a rubber track, and more specifically, it aims at improving the durability of the rubber track.
[0002]
[Prior art]
A rubber crawler is wound around a drive wheel, an idler wheel, and a roller wheel provided in a machine body such as a construction machine or a civil engineering work machine, and is used for traveling. FIGS. 1 and 2 show an example thereof, which is usually an endless rubber elastic body 21, a cored bar 22 embedded at a constant pitch, and a main code 23 surrounding the cored bar 22, It consists of lugs 24 formed on the outer peripheral surface.
[0003]
However, when the vehicle is used for running, the road surface is not only flat, but also rides on the protrusions on the road surface or is rubbed against the curb 30 to cause cracks C on the outer surface of the rubber crawler. A so-called ear-cut phenomenon occurs at the left and right ends of the elastic body 21 in the longitudinal direction.
[0004]
In order to examine the ear-cut phenomenon, it is presumed to be caused by the difference between the rigidity of the cored bar 22 and the flexibility of the rubber elastic body 21. For example, a rubber crawler is repeatedly rubbed against the curb 30 and the cored bar 22 is rubbed. It is confirmed that the rubber elastic body 21 at the left and right ends of the rubber plate is extremely bent, and shear strain is concentrated here, and cracks C are formed on the outer peripheral surface of the rubber elastic body 21 along the left and right ends of the cored bar 22. Yes.
[0005]
[Problems to be solved by the invention]
The present invention provides a structure that reduces the occurrence of such ear breakage, and aims to improve the durability of a rubber track.
[0006]
[Means for Solving the Problems]
The gist of the present invention is a rubber crawler comprising an endless rubber elastic body, a cored bar embedded at a constant pitch, a main cord surrounding the cored bar, and a lug formed on the outer peripheral surface. In the present invention, the protruding portion is formed on the outer peripheral surface of the rubber elastic body corresponding to the left and right end portions of the core metal so as to straddle the front and rear lugs.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, protrusions are formed on the outer peripheral surface of the rubber elastic body corresponding to the left and right ends of the core bar where ear breakage is most likely to occur. The distortion that occurs on the left and right ends can be dispersed, and the left and right ends of the ridges are inclined surfaces, and the projections and curbs that protrude on the running surface by making this an optimum angle, etc. The movement to get on is made easy to slip down, and this has a function to prevent the rubber from cracking.
[0008]
For this purpose, the protrusion has a triangular or trapezoidal cross section in the width direction of the rubber crawler. The protrusion has a height of 5 mm or more and a lug height of 0. 7 times or less, it is optimal that the slopes on the left and right ends of the ridge are 0 to 45 degrees apart from the angle of the lugs and the top of the ridge is within 0 to 15 mm from the left and right ends of the cored bar. It is what. Of course, if the left and right ends of the metal core always overlap with the lugs formed on the outer peripheral surface of the rubber elastic body, the configuration of the present invention is not taken.
[0009]
Here, the height of the protruding portion is set to 5 mm or more because, if it is lower than 5 mm, the volume of rubber is reduced, so that the effect of suppressing the ear cut is reduced, and the height of the lug is set to 0. The reason why it is 7 times or less is that if it is higher than 0.7 times, cracks may occur in the protrusion due to bending fatigue. Also, in the inclined surfaces at the left and right ends of the ridge, the difference from the angle of the inclined surface of the lug is set to 0 to 45 degrees. By setting the difference to 45 degrees or less, the protruding part protrudes from the running surface. This is because it is easy to slip off from a curb or the like, and the rubber distortion occurring time at the left and right ends of the core metal can be shortened. Furthermore, the top of the ridge is within 0 to 15 mm from the left and right ends of the metal core. When the ridge runs on a curb or the like, rubber deformation occurs and the top position is the end of the metal core. This is because the top part comes to the position of the end of the metal core when it is pulled because it is pulled toward the part side.
[0010]
【Example】
Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 3 is a plan view of the outer peripheral surface of the rubber track of the present invention, FIG. 4 is a plan view of the inner peripheral surface, FIG. 5 is a side view thereof, and FIG. Reference numeral 1 denotes a rubber elastic body that forms a rubber crawler, and continuously forms an endless shape on the top and bottom of FIG.
[0011]
A cored bar 2 is embedded in the rubber elastic body 1 with a constant pitch, and its wings 2a extend left and right. Reference numeral 3 denotes a main cord made of a steel cord, which is a member that resists tensile tension applied to the rubber crawler. The main cord 3 surrounds the wing portion 2a of the core metal 2 and is embedded in the longitudinal direction of the rubber elastic body 1. Reference numeral 4 denotes a lug formed on the outer peripheral surface of the rubber elastic body 1, and in this example, the lug is formed across the wings 2a of the adjacent cored bars 2 and is formed by shifting them alternately in a staggered manner on the left and right. It has been done. Reference numeral 5 denotes an engagement hole of the driving wheel, and 6 denotes a corner portion protruding from the inner peripheral surface of the rubber track from the core metal 2.
[0012]
The ridge portion 10 is formed so as to cover the wing portion 2a of the core metal 2 and straddle the lugs 4 and 4. The protrusion 10 has a triangular cross section in the width direction of the rubber crawler, and includes an inclined surface 10a at the left and right ends and an inclined surface 10b at the inside. The inclined surfaces 10a at the left and right ends rise from the left and right ends of the rubber crawler and are 30 degrees with respect to the angle 60 degrees of the inclined surface 4a of the lug 4. And the height 10c of the protrusion part 10 is 12 mm, and is about 0.5 times the height 4b (25 mm) of the lug 4. Further, the top portion 10 d of the ridge portion 10 is disposed 5 mm inside from the end of the wing portion 2 a of the core metal 2. The inner inclined surface 10b rises at an angle of 20 degrees from the outer peripheral surface of the rubber track.
[0013]
In the rubber crawler, the maximum width of the rubber elastic body 1 is 300 mm, the length from end to end of the wing part 2a of the core metal 2 is 260 mm, and the top of the ridge 10 from the left and right ends of the rubber elastic body 1 The length up to 10d is 25 mm, and the length to the end of the inner inclined surface 10b is 60 mm.
[0014]
FIG. 7 is a plan view of the outer peripheral surface showing another example of the rubber track of the present invention. In this example, the lugs 4 are arranged in a letter C shape, and the protrusions 10 are formed in the longitudinal direction of the rubber crawler so as to cover the ends of the wing parts 2a of the core metal 2 and straddle the lugs 4, 4. It is a thing. In this example, the protrusion 10 is substantially trapezoidal in cross section in the width direction of the rubber crawler, the inclined surfaces 10a at the left and right ends rise from the left and right ends of the rubber crawler, and the angle of the inclined surface 4a of the lug 4 is 60 degrees. The angle was 20 degrees. The height of the protrusion 10 (see 10c in FIGS. 5 and 6) is 0.3 times the height of the lug 4 (see 4b in FIGS. 5 and 6). Further, the top portion 10 d (substantially trapezoidal upper surface portion) of the ridge portion 10 is disposed at the end of the wing portion 2 a of the core metal 2. The inner inclined surface 10b rises at an angle of 20 degrees from the outer peripheral surface of the rubber track.
[0015]
In the conventional rubber crawler, the outer surfaces of the left and right end portions are almost flat, or conversely, since these end portions are formed slightly thin, the bendability is high, resulting in the occurrence of ear cuts. Was natural. However, in the rubber crawler of the present invention, the protrusions 10 are formed so as to cover the left and right end portions 2a of the core metal 2, so that the distortion to the rubber concentrated on the left and right end portions 2a of the core metal 2 is reduced. This was dispersed and absorbed by the thickness of the rubber (ridge portion) to reduce the bending of the ear portion of the rubber crawler, thereby reducing the occurrence of ear breakage.
[0016]
In addition, since the outer surface of the ridge 10 is an inclined surface 10a, it also has a function of sliding down when trying to ride on the curb from the road surface, and the occurrence of derailment between the rubber crawler and the wheel. Can also be reduced.
[0017]
【The invention's effect】
According to the present invention, the protrusions are formed on the outer peripheral surface of the rubber elastic body corresponding to the left and right ends of the core bar where the ear breakage is most likely to occur, and the distortion generated at the left and right ends of the core bar can be dispersed. In addition, the left and right ends of this ridge are inclined surfaces, and by making this an optimum angle, the movement to ride on the protrusions and curbs that protrude on the running surface is easy to slip off. Thus, the rubber is provided with a function of preventing the rubber from cracking.
[Brief description of the drawings]
FIG. 1 is a plan view of an outer peripheral surface of a conventional rubber track.
FIG. 2 is a sectional view taken along line aa in FIG.
FIG. 3 is a plan view of the outer peripheral surface of the rubber track of the present invention.
4 is a plan view of the inner peripheral surface of FIG. 3; FIG.
FIG. 5 is a side view of FIG. 3;
6 is a cross-sectional view taken along the line AA in FIG. 3. FIG.
FIG. 7 is a plan view of the outer peripheral surface of another example of the rubber track of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rubber elastic body 2 Core metal 2a Core wing part 3 Main cord 4 Lug 4a Lug sloping surface 4b Lug height 10 Projection part 10a The right and left ends of the projection part Inclined surface 10b Inclined surface 10c on the inner side of the ridge portion ridge height 10d ridge top portion

Claims (5)

In a rubber crawler comprising an endless rubber elastic body, a cored bar embedded at a constant pitch, a main cord surrounding the cored bar, and a lug formed on the outer peripheral surface, A rubber crawler, characterized in that a ridge is formed on the outer peripheral surface of a rubber elastic body corresponding to the end portion across the front and rear lugs. The rubber crawler according to claim 1, wherein the protrusion has a triangular or trapezoidal cross section in the width direction of the rubber crawler. The rubber crawler according to claim 1 or 2, wherein the height of the protrusion is 5 mm or more and 0.7 or less the height of the lug. The rubber crawler according to any one of claims 1 to 3, wherein the inclined surfaces at the left and right ends of the ridge portion have a difference from the inclined surface angle of the lug of 0 to 45 degrees. The rubber crawler according to any one of claims 1 to 4, wherein the top of the ridge is within 0 to 15 mm from the left and right ends of the cored bar.

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