JP2004161193A - Core bar less rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber crawler capable of reducing uneven wear of a lug, and enhancing straightness thereof. <P>SOLUTION: In the core bar less rubber crawler 1, a lug 3 is formed in the periphery of an endless rubber elastic body, guides 2 are protruded in the center of the inner surface at regular intervals, and a core body represented by a steel cord 4 is buried in an endless state in the longitudinal direction of the elastic body. In such constitution, rolling wheels provided in a vehicle straddle the guides and roll on the inner surface. The thickness of the elastic body in areas where the wheels 20 roll is gradually increased towards the right and left width edges, and an inclined surface 10 is formed inwardly almost in a V-shape. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a novel structure of a rubber roller without a metal core, and more particularly to a rubber roller which prevents uneven wear of a lug and has excellent straightness.
[0002]
[Prior art]
In recent years, rubber rollers have been used for relatively high-speed running. For this reason, coreless rubber rollers in which a core metal is not embedded in a rubber elastic body have appeared. La has been proposed.
[0003]
As shown in FIG. 4 of Patent Document 1, a lug 2 is formed on an outer peripheral surface of an endless rubber elastic body 1, and a guide 4 is provided at a center of an inner peripheral surface at a constant interval. A core body 5 typified by steel code is embedded in the rubber elastic body 1 in the longitudinal direction in an endless manner. For the rubber crawler having such a structure, the rolling wheel 6 provided on the vehicle rolls on the inner surface of the rubber elastic body 1 across the guide.
[0004]
[Patent Document 1] JP-A-6-344951
However, as is apparent from FIG. 4 of Patent Document 1, the load transmitted from the rolling wheel 6 to the rubber crawler is not uniform, and is inevitably concentrated near the center of the rubber crawler in the width direction. Speaking from the rubber crawler side, even with a rubber crawler having a wide angle width, only the vicinity of the center of the lug 2 only resists the load, and the result is that no load is received near the left and right width ends of the lug 2. Has become.
[0006]
[Problems to be solved by the invention]
It has been pointed out that such a rubber crawler not only causes uneven wear on the lug 2 but also affects the straightness of the rubber crawler and makes it easier to meander. An object of the present invention is to solve such a drawback, and an object of the present invention is to provide a rubber crawler that applies a load almost uniformly to the entire width of the lug 2.
[0007]
[Means for Solving the Problems]
According to the present invention, a lug is formed on an outer peripheral surface of an endless rubber elastic body, and a guide is provided at a center of an inner peripheral surface at a predetermined interval, and a steel coil is formed in a longitudinal direction of the rubber elastic body. A core body typified by a core is embedded endlessly, and a rolling wheel provided on the vehicle is a coreless rubber roller that rolls on the inner peripheral surface across the guide, and at least the rolling wheel is rolled. The rubber elastic body of the moving part gradually increases in thickness from the center toward the left and right width ends, and is formed with an inwardly inclined surface having a substantially V-shape.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is a core metal-less rubber crawler having the above configuration, and the inner peripheral surface is inclined from the center in the width direction to the left and right ends from the center of the rubber elastic body forming the base of the rubber crawler. Is provided with an inclined surface so that the thickness of the rubber elastic body increases toward the left and right ends. As a further specific example, at least a surface on which the rolling wheel rolls is provided with an inclined surface, whereby a load from the rolling wheel is applied to the entire surface of the rubber elastic body. In other words, when there is no inclined surface, the load is hardly applied to the left and right end portions, but by employing the configuration of the present invention, the load is uniformly applied to the rubber elastic body.
[0009]
The appropriate value of the angle of inclination of the slope depends on the size and weight of the vehicle, the width of the rubber crawler, the shape of the rolling wheels, etc., but is 0.5 to 30 degrees, usually about 4 to 20 degrees. is there. Of course, the inclination angle naturally depends on the presence of another reinforcing member (for example, a bias code) in the rubber elastic body. In addition, the lug which opposes at least the part where a rolling wheel rolls may be increased in thickness (lug height) gradually toward the left and right width ends in association with the above configuration or alone.
[0010]
In the rubber crawler having the above-described configuration, the lug provided on the outer surface of the rubber elastic body receives a substantially uniform load from the lug center region to the width end region. Wear is reduced and the straightness of the rubber crawler is improved.
[0011]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples. FIG. 1 is a cross-sectional view in the width direction of a rubber crawler 1 of the present invention. The left half is a cross-sectional view between guides, and the right half is a cross-sectional view at a guide portion. Reference numeral 2 denotes a guide, which is a rubber projection provided at a constant pitch at the center on the inner peripheral side of a rubber elastic body forming a base of the rubber roller 1. Reference numeral 3 denotes a lug provided on the outer peripheral side of the rubber elastic body. In this example, the lug is substantially linear toward the left and right width ends corresponding to the guide 2. In this rubber crawler, a main steel cord 4 is buried in the longitudinal direction, a further steel cord 5 is buried inside, and two bias steel cords 6 are buried outside. .
[0012]
In the rubber roller 1, an inner peripheral surface of the rubber elastic body sandwiching the guide 2 in the left-right width direction is formed as an inclined surface 10 at an angle θ (about 5 degrees in this example).
[0013]
FIG. 2 is a cross-sectional view showing the state of the rubber crawler when the rolling wheel rolls on the inner peripheral surface. Reference numeral 20 denotes the rolling wheel which rolls on the left and right inner peripheral surfaces of the rubber crawler 1 across the guide 2. The rolling wheels 20 are fixed to a vehicle (not shown), and serve to transmit the force input from the outside to the rubber roller 1 as well as the weight of the vehicle.
[0014]
At the time of running, a load is applied from the rolling wheel 20, but at least the running surface (the inner peripheral surface of the rubber crawler) of the rolling wheel 10 becomes a substantially V-shaped inclined surface 10 toward the width end. Therefore, the left and right width sides of the rolling wheel 20 share the load equally to the inner side.
[0015]
If only the inclined surface 10 formed on the inner peripheral surface of the rubber elastic body constituting the rubber crawler 1 is taken out and described, in some cases, a sufficient effect can be obtained even if only the traveling portion of the rolling wheel 20 is formed as the inclined surface. Is obtained.
[0016]
FIG. 3 is a cross-sectional view in the width direction showing another example of the rubber roller 1 of the present invention. The left half is a cross-sectional view between guides, and the right half is a cross-sectional view at a guide portion. In this example, the inclined surface 10 on the inner peripheral surface is formed, and the height of the lug 3 is also inclined, thereby further providing a degree of design freedom for achieving the object of the present invention. In some cases, the problem can also be solved by devising only the lug 3 as described above.
[0017]
【The invention's effect】
The present invention is as described above. By making the inner peripheral surface of the rubber crawler on which the rolling wheel rolls an inclined surface, the load can be made uniform, thereby causing uneven wear of the lug. Thus, the durability of the rubber crawler is improved, and the straightness of the rubber crawler is improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the width direction of a rubber crawler according to the present invention. The left half is a cross-sectional view between guides, and the right half is a cross-sectional view at a guide portion.
FIG. 2 is a cross-sectional view showing a relationship between a rubber roller and a wheel of FIG. 1;
FIG. 3 is a cross-sectional view in the width direction showing another example of the rubber roller of the present invention.
[Explanation of symbols]
1 ‥ rubber crawler,
2 guide,
3 ‥ rug,
4 ‥ Main steel code,
10 ° slope,
20 ‥ wheel,
θ ‥ tilt angle.

Claims (1)

A lug is formed on the outer peripheral surface of the endless rubber elastic body, and a guide is provided at a certain interval in the center of the inner peripheral surface, and is represented by a steel code in the longitudinal direction of the rubber elastic body. A core member is embedded in an endless manner, and a rolling wheel provided in the vehicle is a coreless rubber roller that rolls on an inner peripheral surface across the guide, and at least a rubber at a portion where the rolling wheel rolls. A core-less rubber crawler, characterized in that the elastic body gradually increases in thickness toward the left and right width ends and has an inwardly inclined surface formed in a substantially V shape.

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