JPH11217091A - Inner circumference drive type rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent separation of a rubber member stuck to forward and rear sides of a corner part by forming a driving projection comprising the rubber member covering the corner part in the longitudinal direction of a pair of corner parts, and forming a through hole in the longitudinal direction of the corner parts. SOLUTION: A rubber crawler 20 is formed of an endless rubber elastic body as a base body, a wing part 11 of a core 10 is embedded here, and a steel cord 22 is embedded surrounding these components on the outer side. A corner part 12 of the core 10 is covered by a rubber member 23 integrated with the rubber elastic body 21 on its longitudinal surface, and a driving projection 24 is formed of the corner part 12 and the rubber member 23. An oblong through hole 13 is cut in the longitudinal direction of the corner part 12. A rubber connection part 27 is inserted in the through hole 13 of the corner part 12. Even when an adhesive interface is separated, the rubber member is prevented from being easily separated and detached due to the presence of the rubber connection part 27, and the durability of the rubber crawler 20 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an inner peripheral driving type rubber crawler.

[0002]

2. Description of the Related Art As an improved structure of a sprocket drive type rubber roller, an inner circumference drive type rubber roller has been proposed, and the latter inner circumference drive type rubber roller is mainly used for high speed traveling. Has been adopted. However, this inner peripheral drive type rubber crawler transmits a driving force to the rubber crawler by engaging a rubber projection formed on the inner circumference of the rubber crawler at a constant pitch with a sprocket. The repetitive contact causes the rubber projections to be missing or worn, and there are still many problems.

[0003] In view of these problems, the present inventor has already provided an improved version of this inner peripheral drive type rubber crawler. This proposed rubber crawler has a metal core that is arranged side by side in the width direction,
A steel cord surrounding the metal core is embedded, and a pair of corners elongated in the left-right width direction of the metal core protruding from the metal core to the inner peripheral side of the rubber crawler. This is a structure in which a pair of driving projections composed of a rubber member covering the corner portion is formed on the front-rear direction surface of the portion.

[0004] The pair of driving projections engage with driving pins provided upright on the sprocket to transmit a driving force, and the rubber members are in contact with the driving pins. The sprocket comprises a disc inserted between a pair of driving projections of a rubber crawler, and driving pins provided upright on the left and right sides of the disc. The driving pin and the driving projection are formed by a rubber member forming the driving projection. Transmits driving force by direct contact. For this reason, the contact between metals
Since there is no collision, noise and abrasion are reduced, and since the corners extending from the metal core are arranged in the entire width direction of the drive projection, wear on the side surface of the drive projection is reduced. . Further, even when a thrust load is applied to the projection during turning, the problem that the tip of the corner is lost does not occur.

[0005] However, the rubber member at the driving projection is repeatedly compressed by the driving pin at all times, and especially when a thrust load is applied during the turning of the rubber crawler, torsional strain acts on the rubber member. For this reason, the adhesive surface between the corner portion and the rubber member is easily peeled off, and further, the sand and the like enter the peeled portion, and the peeling gradually proceeds. The peeling is further accelerated by applying a torsional force to the rubber member when the rubber member is turned or when a lateral external force is applied to the rubber crawler.

[0006]

SUMMARY OF THE INVENTION The present invention is intended to prevent the rubber members adhered to the front and rear surfaces of the corners from peeling off, and is an improvement in the corners standing upright from the cored bar. .

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the present invention is to provide a core bar horizontally arranged in the width direction and a steel bar surrounding the core bar. And a pair of corners elongated in the width direction of the core bar that protrudes from the core bar toward the inner peripheral side of the rubber crawler. A rubber member that covers the corner in the front-rear direction, and a driving projection made of the rubber member, and a hole that penetrates the corner in the front-rear direction; is there.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the present invention is provided with holes which penetrate through the front and rear surfaces of the corners of the core bar forming the driving projections. Rubber members that are vulcanized and bonded to the front and rear surfaces of the corners are connected via the through holes. For this reason, even if the rubber member covering the front and rear surfaces of the corners is peeled off at the bonding surface, the rubber member does not easily peel off and fall off due to the presence of the connecting portion, thereby improving the durability as a rubber crawler. As a result, noise and vibration can be reduced without contact between metals. In addition, not only one through-hole but also a plurality of perforations can be formed at appropriate portions, and the shape of the through-hole is not particularly limited.

[0009]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples. FIG. 1 is a plan view of an inner peripheral side of a rubber crawler of the present invention,
2 is a plan view of the outer peripheral side, and FIG. 3 is a right side view. And
FIG. 4 is a plan view of the cored bar, and FIG. 5 is a front view thereof. In the figure,
Reference numeral 20 denotes a rubber crawler having an endless rubber elastic body 21 as a base, the wings 11 of the metal core 10 being buried here, and surrounding them with a steel code 22 together. Have been. A rubber member 23 integrated with a rubber elastic body 21 is formed on the front and rear surfaces of the corner 12 of the metal core 10 so as to cover the corner 12, and is driven by the corner 12 and the rubber member 23. A projection 24 is formed.

[0013] Furthermore regards the metal core 10, a pair of corner portions 12 are formed in the wings 11, the width W ₁ of the core lateral width direction of the corner portion 12 is configured larger than the width W ₂ in the longitudinal direction , yet the width W ₁ of the former the Gomukuro - are substantially the same as the lateral width of the drive lugs 24 La. An oval through hole 13 is formed in the front and rear direction of the corner 12. The thickness of the central portion 14 between the corners 12 is slightly thicker than that of the wing 11 because it is not a transmission portion of the driving force.

A rubber lug 25 is provided on the outer surface of the rubber crawler 20 with the left and right ends extending in the width direction and the central portion being inclined. In this example, long and short rubber lugs are alternately formed. Moreover, these are arranged obliquely over the adjacent metal cores 10, 10. As can be seen from the figure, the central portion 14 of the cored bar 10 is substantially flush with the inner peripheral surface of the rubber crawler, and the rubber portion 30 connected to this portion is formed.
A groove 26 is formed at the interface of the lower mold, which is formed by providing a pair of ridges on the lower mold as described above. In addition, it is preferable that the height of the rubber portion 30 forming the groove 26 is slightly higher on the inner peripheral side than the central portion 14 of the metal core 10.

FIG. 6 is a cross-sectional view of the rubber crawler taken along line AA. As can be seen from the example of the figure, an oblong through hole 13 is formed in the corner 12 of the metal core 10 in the front-rear direction. Accordingly, the core metal 10 is set in the lower mold, a steel cord 22 is stretched over the lower metal mold, and an unvulcanized rubber is further filled. The rubber member 23 is integrally formed on the front and rear surfaces of the rubber member 23. The rubber also enters the through hole 13 of the corner portion 12 (rubber connecting portion 27) and connects the rubber members 23, 23 to each other. . The sprocket 40 includes a disk 41 and a drive pin 42 provided on the periphery thereof. The disk 41 rolls between the drive protrusions 24.

For this reason, the rubber members 23, 23 covering the front and rear surfaces of the corner portion 12 are always subjected to a distortion for transmitting the driving force by the drive pin 42, thereby bonding the interface between the rubber member 23 and the corner portion 12. It may peel off. However, even if the adhesive interface is peeled off, the rubber connecting portion 27 does not easily peel off and drop off, so that the durability as a rubber roller is improved and there is no contact between metals. The generation of noise and vibration was also reduced. Incidentally, not only one through-hole 13 but also a plurality of perforations can be formed at appropriate portions, and the shape of the through-hole 13 is not particularly limited.

[0013]

According to the rubber crawler of the present invention, the sprocket is driven by the engagement between the driving pin and the driving projection. However, the rubber member of the driving projection does not peel off from the corner of the cored bar. -The life as a roller has been improved.

[Brief description of the drawings]

FIG. 1 is an inner peripheral plan view of a rubber crawler according to the present invention.

FIG. 2 is a plan view of an outer peripheral side of the rubber crawler of FIG. 1;

FIG. 3 is a right side view of the rubber crawler of FIG. 1;

FIG. 4 is a plan view of a cored bar.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a sectional view taken along line AA.

[Explanation of symbols]

 10 mm core, 11 mm core wing, 12 mm corner, 13 mm through hole, 14 mm center of metal, 20 mm rubber crawler, 21 mm rubber elastic body, 22 ‥‥ steel cord, 23 ‥‥ rubber member covering front and rear surfaces of corners, 24 ‥‥ drive projection, 25 ‥‥ rubber lug, 26 ‥‥ groove, 27 ‥‥ rubber connection, 30 ‥‥ rubber Part, 40 ‥‥ sprocket, 41 ‥‥ disc, 42 ‥‥ drive pin.

Claims (1)

[Claims] 1. A rubber crawler having a core bar laid side by side in the width direction and a steel cord surrounding the core bar embedded therein, protruding from the core bar to the inner peripheral side of the rubber crawler. A driving projection is formed, comprising a pair of corners elongated in the width direction of the cored bar, and a rubber member covering the corners in the front-rear direction of the pair of corners. An inner peripheral drive type rubber crawler, wherein a hole penetrating in the direction is formed.