JP3190944B2 - Rubber craw lug structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler, and more particularly to a lug structure of a rubber crawler used for a traveling portion of a construction machine or a civil engineering work machine.

[0002]

2. Description of the Related Art Conventionally, iron crawlers have been used as running parts in construction machines and civil engineering machines. In recent years, rubber crawlers have been used as running parts. This rubber crawler is made of an endless belt made of a rubber elastic body. A number of metal cores arranged side by side in the width direction are buried in rubber, and this is laid by a steel code (tension body). Because it is a structure that is enclosed and made of rubber, vibration transmitted to occupants is reduced, and it is preferred to use it because it does not damage the road surface even when traveling on paved road surface It is.

[0003] In these construction and civil engineering machines,
Generally, both iron and rubber crawlers can be mounted, and the rolling wheels provided on the fuselage are mounted on the top surface of the projections protruding toward the inner peripheral side of the rubber crawlers. It is a running surface.

FIG. 4 schematically shows a relationship between a core metal and a rolling wheel in a rubber crawler. In the figure, reference numeral 1 denotes a metal core, and a projection 2 is formed from the metal core 1 so as to project from the inner peripheral surface of the rubber crawler. The protrusions 2 are formed as a pair, and the protrusions 2
And the top surface 4 of the projections 2, 2 is a running surface of the rolling wheel 5.

However, when the rolling wheel 5 travels on the top surface 4 of the projection 2, the rolling wheel 5 is moved to the position A, that is, the top surface 4 of the projection 2.
When riding the vehicle, the weight of the fuselage
In particular, since the swollen portion 3 is received, the cored bar 1 becomes cantilevered and inevitably tilts in the X direction. When the rolling wheel 5 is traveling at the position B, that is, substantially at the center of the core 1, the core 1 does not tilt, but then the rolling wheel 5 is at the position C, that is, the top surface of the projection 2. When moving away from above and moving to the top surface 4 of the core bar 1 located next, the core bar 1 also becomes cantilevered and is inclined in the Y direction opposite to the X direction.

[0006]

That is, in a rubber crawler used for a large-sized machine such as a bulldozer or a power shovel, a cored bar is moved right and left with the passage of a wheel. It tends to tilt, which not only becomes a source of vibration for the occupant, but also causes crack breakage of the rubber elastic body, and has the disadvantage of significantly shortening the life of the rubber crawler.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks, and it is an object of the present invention to suppress the inclination of a metal core in a rubber elastic body from side to side, thereby improving the durability as a rubber crawler.

[0008]

The present invention employs the following configuration to achieve the above object. That is, in the present invention, a core metal is arranged side by side in the width direction at a constant pitch in a band-shaped rubber elastic body, and a tensile member surrounding the core metal is embedded together, and the width of the band-shaped rubber elastic body is A rubber crawler having a sprocket engagement hole between the cores at the center in the direction, straddling the projection surface of an adjacent core, and having a trapezoidal cross-sectional shape in the longitudinal direction on the outer peripheral surface of the rubber crawler; A rubber crawler, characterized in that a lug divided into right and left by an engagement hole is formed, and a base width of the lug reaches a projection area of an adjacent core bar within a range not reaching a center portion of the core bar. It is related to the lug structure, and it is generally preferable that the overlapping amount between the tip width of the lug and the core metal is 0 to 10 mm.

[0009]

According to the present invention, a lug is formed on the outer peripheral surface of the rubber crawler, that is, on the grounding surface side, between the metal cores, and the lugs themselves have the ability to transmit the propulsive force. At the same time, the lugs support the left and right inclination of the core bar when the wheel runs on the top surface of the protrusion of the core bar that protrudes from the inner peripheral surface of the rubber crawler. To try to hold it down.

[0010] In this type of conventional rubber crawler, a lug is generally formed on the outer peripheral surface of the rubber crawler in a one-letter shape corresponding to the embedding position of the core. There was nothing to support the weight of the fuselage between the mandrel, so there was no way to support the mandrel tilting while the wheels were running.

The present invention has been made in view of such a point, but JP-A-1-208284 has already disclosed a point of forming a lug that straddles the projection area of two metal cores. However, this is an extremely wide lug that completely spans the projection area of the two cores, and the distance between the lugs is between the cores as in the case of the conventional rubber crawler. Therefore, this example still does not provide a lug to support all the inclinations of the cored bar. It can be said that the present invention is also an improvement over the shortcomings of this technique, in which lugs are present in places where there is no core, and lugs are substantially present in the stiffened cores where they are embedded. This is because the rubber crawlers are not homogenized in rigidity as a whole, and also have a great feature in this respect.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a plan view of an outer peripheral surface side showing an embodiment of a rubber crawler of the present invention, and FIG. 2 is a plan view of P ₁ -P ₁ in FIG.
FIG. 3 is a cross-sectional view taken along the plane P ₂ -P ₂ in FIG. In FIG. 1, reference numeral 11 denotes a band-shaped rubber elastic body forming a rubber crawler base, which is an endless band continuous to the left and right in FIG. Numeral 12 is a core metal, which is embedded in the rubber elastic body 11 side by side,
The central portion 13 is an engagement portion with a sprocket (not shown), and a sprocket hole 14 is formed between the central portions 13 and 13 of the adjacent cored bar 12. Reference numeral 15 denotes a steel cord buried in the longitudinal direction of the rubber elastic body 11 and surrounds the metal core 12. A pair of protrusions 16 protruding from the inner peripheral surface of the rubber crawler are provided on the core metal 11.
_1, 16 ₂ are formed, the projections 16 _1, 16 ₂ has a disengagement preventing function between the rolling wheel 30 provided on the body, and its top surface 17 is the running surface of the track roller 30. The projections 16 ₁ and 16 ₂ are examples in which bulging portions 18 ₁ and 18 ₂ are formed in opposite directions toward the longitudinal direction of the rubber crawler.

A lug 19 having a trapezoidal cross section in the longitudinal direction of the rubber crawler is formed on the outer peripheral surface side of the rubber crawler, that is, on the grounding surface side. It is formed between the golds 12. The lug 19 has a shape extending over the projection surface of the adjacent metal cores 12, 12.
No. 1 does not reach the center of the metal core 12, the adjacent lugs 19, 19 are not continuous, and the base widths 21, 21 are formed with an interval (T ₂ ). Such lugs 19,
In the case of No. 19, the continuation of the lugs is not preferable because the continuation of this results in a large resistance when wound around a sprocket or an idler. In this example, the tip surface 20 of the lug 19 also reaches the projection surface of the adjacent metal cores 12, 12, and in this example, the overlap amount (T ₁ ) is about 5 mm.

In particular, as can be seen in FIG. 3, no matter where the rolling wheel 30 is on the top surface 17 of the projections 16 ₁ , 16 ₂ ,
Some of them receive the weight of the body added through the rolling wheels 30, and both ends of the top surface 17, that is, the bulging portions 18 ₁ and 18
_When the rolling wheel 30 is provided on the lug 19, the lug 19 receives the wheel. When the rolling wheel 30 is provided at the center of the top surface 17, the core metal 12 receives the weight as it is.
Is running on the top surface 17 of the projection 16, the inclination of the cored bar 12 to the left and right is effectively prevented.

Although not shown, the lug of the present invention is provided with a sipe at the center thereof in the width direction of the rubber crawler so that the rigidity of the lug, particularly when wound around a sprocket or an idler, is increased. Resistance can be reduced. In the illustrated example, the base of the lug 19 rises at an acute angle from the outer peripheral surface of the rubber crawler, that is, the ground contact surface. However, in some cases, it is preferable that the lug 19 rises in an arc shape. It is preferable to design such that the distortion on the surface side when wound is as uniform as possible.

[0016]

According to the present invention, there is provided a rubber crawler having the above-described structure. Even when the rubber crawler is applied to a large construction machine or a civil engineering machine, the inclination of the core metal to the left and right is effectively prevented. The durability of the rubber crawler was significantly improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an outer peripheral surface side showing an example of a rubber crawler according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along a plane P ₁ -P ₁ in FIG. 1;

FIG. 3 is a sectional view taken along the plane P ₂ -P ₂ in FIG. 1;

FIG. 4 is a schematic diagram showing a relationship between a cored bar and a wheel in a conventional rubber crawler.

[Explanation of symbols]

11 Rubber elastic body 12 Core metal 13 Center part of metal core 14 Sprocket hole 15 Steel code 16, 16 ₁ , 16 ₂ Projection 17 Top surface of projection 18 ₁ , 18 ₂ ‥‥ bulge of protrusion 19 ‥‥ lug 20 先端 tip of lug 21 基底 base width of lug 30 ‥‥ wheel

Claims (2)

(57) [Claims] 1. A core metal is arranged side by side in a width direction in a belt-shaped rubber elastic body at a constant pitch, and a tensile member surrounding the core metal is embedded together, and a width direction of the band-shaped rubber elastic body is embedded. In a rubber crawler having a sprocket engagement hole between the metal cores at the center, the rubber crawler straddles a projection surface of an adjacent metal core,
A cross-sectional shape in the longitudinal direction is trapezoidal on the outer peripheral surface of the rubber crawler, and a lug divided into right and left by a sprocket engagement hole is formed. A lug structure of a rubber crawler, wherein the lug reaches a projection area of a cored bar. 2. The lug structure of a rubber crawler according to claim 1, wherein an overlap amount between the tip width of the lug and the core metal is 0 to 10 mm.