JPH11321731A - Rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the lateral rigidity of a rubber roller by providing a rubber layer harder than the hardness of the rubber for constituting an endless rubber elastic body between an anti-expansion body and a rubber lug. SOLUTION: In a rubber crawler consisting of a rubber elastic body 1, a steel cord 2 as an anti-expansion body built therein, a rubber lug 3 formed on the outer periphery side thereof and a rubber projection for driving 4, a high hard rubber layer 10 in a longitudinal direction is formed in a plate shape, in a width direction and in the rubber elastic body 1. When the hardness of the rubber elastic body 1 is 70 degree, the hardness of the rubber lug 3 is 65 degree and the hardness of the rubber projection for driving 4 is 85 degree, the hardness of this rubber layer 10 is made to 85 degree. The gap between the anti-expansion body 2 and the rubber layer 10 is about 1-15. Therefore, the occurrence of a dewheel can be reduced by improving the lateral rigidity without increasing a winding resistance so much.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel rubber crawler having improved lateral rigidity.

[0002]

2. Description of the Related Art A rubber crawler has been widely used in place of a conventional iron crawler, and this rubber crawler has a feature that the road surface is not damaged and the riding comfort is good. The problem is that the lateral rigidity of the rubber crawler is insufficient during running, climbing on a protrusion on the road surface, or turning, and the relative position between the sprocket, idler, or track roller and the rubber crawler shifts, causing derailment. was there.

[0003] In order to increase the lateral rigidity of the rubber crawler, it is considered that the rubber hardness of the entire rubber crawler is increased.
In this case, the flexibility is poor, and the winding resistance around the sprocket or the idler becomes high, which causes power loss, which is not preferable. In addition, there is a core bar in which a lateral displacement prevention protrusion is formed so as to overlap in the width direction of the crawler.
The shape becomes complicated and the manufacturing cost increases. Note that this measure cannot be established with a coreless rescroller, and a new measure is required.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks, the present invention provides a rubber roller in which a new rubber layer is formed on a rubber roller to increase lateral rigidity.

[0005]

According to the present invention, there is provided an endless rubber elastic member, a tensile member buried in the longitudinal direction thereof, and a rubber lug formed on an outer peripheral surface of the endless rubber elastic member. , Wherein a rubber layer having a hardness higher than that of the rubber constituting the endless rubber elastic body is provided between the tensile member and the rubber lug. The hardness of the rubber layer is 70 degrees or more, preferably 80 degrees (JIS-A) or more.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The rubber crawler according to the present invention is obtained by measuring the hardness of the rubber of an endless rubber elastic body serving as a rubber crawler body on the outer peripheral side of a tensile member embedded along the longitudinal direction of the rubber crawler. Also, a high hardness rubber layer is present, and a high hardness rubber layer is formed close to the tension body, which is a neutral wire wound around the sprocket and idler, so that the lateral rigidity is increased without increasing the winding rigidity. It was done.

That is, since the rubber hardness between the tension member and the rubber lug is merely increased without embedding a resin plate or the like in the rubber crawler body, the lateral rigidity is increased. The winding stiffness did not increase, and the adhesion was perfect. Usually, rubber cloth
The rubber hardness of the rubber body is about 65 to 70 degrees,
The hardness of such a rubber layer is higher than the hardness of these rubbers,
For example, it has a property of 70 degrees or more, preferably 80 degrees or more.

[0008] The presence of this rubber layer increases the lateral rigidity of the rubber crawler, so that the rubber crawler has a rigidity against the shearing force between the road surface and the vehicle even when traveling or turning on an incline. This will reduce the occurrence of rings.

Further, cracks occur on the outer peripheral side of the rubber crawler, and even when the cracks grow, they reach this rubber layer and stop growing, so that the cracks rarely reach the tensile member. For example, since cracks do not reach the steel cord, rust and the like are not generated, which contributes to the improvement of the life of the rubber crawler.

The present invention is preferably employed for a so-called coreless rubber crawler having no embedded core.
Therefore, it is mainly used for an inner drive type rubber crawler, and has substantially the same hardness as a drive rubber projection formed on the inner peripheral surface of the rubber crawler in terms of rubber hardness. It is needless to say that a bias code or a breaker may be used in combination with the tensile member.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a cross-sectional view in the width direction showing a first example of the rubber crawler of the present invention, and FIG. 2 is a cross-sectional view in the width direction showing a second example.

Reference numeral 1 denotes a rubber elastic body constituting a rubber crawler main body, 2 denotes a steel cord as a tensile body embedded in a longitudinal direction of the rubber elastic body 1, and 3 denotes an outer periphery of the rubber elastic body 1. Rubber lugs formed on the side, and are arranged side by side at a constant pitch on the outer peripheral surface. Reference numeral 4 denotes a driving rubber projection, which is also arranged side by side at a constant pitch on the inner peripheral surface. The rubber crawler shown in this figure is an example of an inner drive type rubber crawler, in which a core is not embedded and is mainly used for high-speed running.

The rubber elastic body 1 constituting the rubber crawler body has a rubber hardness of 70 degrees and a rubber lug 3 has a hardness of 65 degrees.
And the hardness of the driving rubber projection 4 is 85 degrees. The rubber crawler having such a structure has low rigidity, and easily deforms particularly when a force moves in a lateral direction, and engages with a sprocket, idler, track roller, etc. (not shown). Comes off and sees the occurrence of derailment.

In the present invention, however, the rubber elastic body 1
A rubber layer 10 having a high hardness in the longitudinal direction is formed in the shape of a flat plate in the width direction.
Have a degree. Due to the presence of the rubber layer 10, even if a lateral force is applied to the rubber crawler, the rubber crawler is provided with a force that opposes the lateral force, so that the lateral displacement is significantly reduced, and the occurrence of derailing is reduced. is there.

In particular, the rubber layer 1 is provided near the tension member 2 which is a neutral wire wound around a sprocket or an idler.
By providing 0, the rigidity in the lateral direction could be improved without significantly increasing the winding resistance. It is desirable that the distance between the tensile member 2 and the rubber layer 10 is small, but actually, the distance is about 1 to 15 mm. If it is 15 mm or more, the winding resistance increases and it is not suitable.

Further, even if a crack c occurs in the rubber crawler, when the growth reaches the rubber layer 10, the growth is suppressed here, and the growth does not reach the tensile member 2. Therefore, rust does not occur in the tensile member 2 due to moisture or the like.

Although the rubber crawler of the present invention has been described above with reference to a cored barless crawler, it is needless to say that the rubber crawler can be applied to a rubber crawler having a cored bar embedded therein. May be provided with a fiber reinforcing layer.

[0018]

According to the rubber roller of the present invention, the rigidity in the lateral direction is increased by the presence of the rubber layer, and the rigidity of the rubber roller against the shearing force between the road surface and the vehicle even when traveling or turning on an inclined ground. And the occurrence of derailing is reduced.

Furthermore, even if cracks occur on the outer peripheral side of the rubber crawler and grow, they reach this rubber layer and stop growing, so that the cracks rarely reach the tensile member. It also contributes to the improvement of the life.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view in the width direction showing a first example of a rubber crawler according to the present invention.

FIG. 2 is a cross-sectional view in the width direction showing a second example of the rubber roller of the present invention.

[Explanation of symbols]

 1) Rubber elastic body, 2) Tensile body (steel code), 3) Rubber lug, 4) Driving rubber projection, 10) High hardness rubber layer.

Claims (3)

[Claims] 1. A rubber crawler comprising an endless rubber elastic body, a tensile member embedded in a longitudinal direction thereof, and a rubber lug formed on an outer peripheral surface of the endless rubber elastic body. A rubber crawler comprising a rubber layer having a hardness higher than that of a rubber constituting the endless rubber elastic body between a body and a rubber lug. 2. The rubber layer has a hardness of 70 degrees (JIS.
2. The rubber crawler according to claim 1, which is A) or more. 3. The hardness of the rubber layer is 80 degrees (JIS.
3. The rubber crawler according to claim 2, which is A) or more.