JPH09207838A - Rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent mesh locking in an abnormal condition of a horizontal projection body for preventing horizontal deviation by protruding the horizontal projection body in the direction in which it goes directly with a side face of a core metal unit on at least either of both sides of an engaging part on both side faces in the direction of width of the core metal unit and providing adjacent horizontal projection bodies at an interval at which they are overlapped when viewed in the peripheral direction of a crawler. SOLUTION: Horizontal projection bodies 5, 5' protrude in the direction in which they go directly with a side face of a core metal unit at a position where they are in proximity with a steel cord when they are embedded in a rubber roller on both sides of an engaging part 3. The horizontal projection bodies 5, 5' are overlapped on adjacent horizontal projection bodies at an interval d, and side faces which are opposite to faces 5a, 5a' of the horizontal projection bodies which oppose each other are formed into tapered faces 5t, 5t' having inclination of a certain angle. When the horizontal projection bodies 5, 5' cause an abnormal mesh condition, the horizontal projection bodies 5, 5' slide to return to normal overlapped condition due to restoration force based on the rigidity of a crawler because the tapered faces 5t, 5t' are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler mounted around the legs of a mobile work machine, and more particularly to a rubber crawler capable of preventing derailment.

[0002]

2. Description of the Related Art A conventional rubber crawler has a drawback in that it tends to be disengaged from a crawler as compared with an iron crawler. This is mainly caused by a local twist of the rubber crawler when turning on a road surface with a step. To take off.
FIG. 9 shows a state in which the conventional rubber crawler is derailed, and the rubber crawler main body 1 is provided between adjacent cored bars 11, 11.
Lateral deviation occurs at 6, and the center wheel 19c of the idler wheel 19 rides on the corner portion 12 of the core metal and derails from the crawler. Reference numeral 17 is a steel cord embedded in the entire circumference of the rubber crawler.

In order to solve this problem, the applicant of the present application proposed a rubber crawler effective for preventing wheel slippage in Japanese Patent Application No. 2-109474. 10A and 10B show this rubber crawler, where A is a plan view and B is a cross-sectional view in the width direction. As shown in the figure, the horizontal projections 15, 1 are provided on both sides of the engaging portion 13.
A metal core 11 having a protrusion 5 ′ in a direction orthogonal to the side surface of the metal core is provided between the adjacent metal cores by the horizontal projections 15, 1.
5'is embedded so as to be overlapped when viewed in the crawler circumferential direction (overlap distance d). Since the horizontal projections 15 and 15 'always maintain a good overlapping distance d, the positions of both sides of the engaging portion that have the least amount of movement when embedded in the rubber crawler and do not hinder winding around a sprocket or the like. It is formed on. Therefore, even when an external force is applied between the cores in the width direction, adjacent horizontal projections collide with each other to prevent lateral displacement.

[0004]

However, in this prior art example, when the rubber crawler is laterally displaced and twisted at the same time, the horizontal projections 15 and 15 'are opposed to each other on the surface opposite to the surface on which the normal projections pass. Even if the crawler body overlaps in an abnormal state and the restoring force due to the rigidity of the crawler body acts, the horizontal projections are fixed (locked) and are not restored, causing the crawler to come off. This will be described with reference to the drawings. The normal overlapping state is as shown in FIG.
a and 15a 'are facing each other, but when an abnormal overlapping state occurs, as shown in FIG.
The outer surfaces 15b and 15b 'of 5'are in opposition to each other and are in a locked state.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a horizontal projection for preventing lateral deviation when a lateral deviation and a twist occur simultaneously in a rubber crawler. Prevents meshing and locking in the state,
(EN) It is an object to provide a core bar for a crawler with a lateral displacement restricting protrusion that prevents wheel loss.

[0006]

The rubber crawler of the present invention is characterized in that a cored bar having an engaging portion with a drive wheel at the center and a pair of protrusions for preventing wheel removal on both outer sides of the engaging portion. In a rubber crawler embedded in a band-shaped elastic body at regular intervals, a horizontal projection is projected in a direction perpendicular to the side surface of the core metal on at least one of both sides of the engaging portion on each side surface in the width direction of the core metal. At the same time, a taper surface inclined at a constant angle is formed on the surface of the horizontal projection opposite to the opposing surface, and the adjacent horizontal projections are arranged at intervals so as to overlap each other when viewed in the crawler circumferential direction.

[0007] It is desirable that the horizontal projections are formed on the same plane as the cored bar wing or on a position slightly on the bottom side, and on the both sides of the engagement part, the bottom face slightly below the cored bar wing. A thick portion may be formed at a side position and a horizontal projection may be attached to the portion.

[0008]

By providing a taper surface inclined at a constant angle on the surface of the horizontal projection opposite to the opposing surface, the crawler is twisted and laterally displaced, and the horizontal projections overlap in an abnormal state as shown in FIG. At this time, due to the restoring force due to the rigidity of the crawler, the tapered surfaces slide with each other to release the locked state between the horizontal projections and restore the normal overlapping state.

Further, since a thick portion is formed on both sides of the engaging portion at a position on the bottom surface slightly below the core metal blade portion, and the horizontal projection is attached to the portion, the embedded position of the horizontal projection is determined. Is close to the steel cord layer, and the horizontal protrusion can maintain a suitable overlapping distance even when the rubber crawler is curved inward or outward.

[0010]

1 and 2 are a perspective view showing a first embodiment of a cored bar embedded in a rubber crawler of the present invention and a partially enlarged view of a lateral deviation restricting projection (horizontal projection). In the figure, 1 is a core bar,
Reference numeral 2 is a corner portion, 3 is a driving wheel engaging portion, 4 is a left and right wing portion, and both sides of the engaging portion 3 are core bars located near the steel cord when embedded in the rubber crawler. The horizontal projections 5 and 5'are made to project in the direction orthogonal to the side surface.

As shown in FIG. 2, the horizontal projections 5 and 5'are overlapped with the adjacent horizontal projections at a distance d. At this time, the horizontal projections 5a and 5a 'are opposite to each other. The horizontal projections are formed in tapered surfaces 5t and 5t 'having a certain angle of inclination, and the horizontal projections have a substantially triangular cross section.

An external force acts on the rubber crawler to cause twisting and lateral displacement at the same time, so that the horizontal projections 5 and 5'are formed.
Is in an abnormal meshing state as shown in Fig. 3,
Since the tapered surfaces 5t and 5t 'are formed, the horizontal protrusions 5 and 5'slave to each other due to the restoring force due to the crawler rigidity so that a normal overlapping state can be obtained. In addition, since the surfaces 5a and 5a 'that are normally facing each other are vertical surfaces, when an external force is applied in the width direction of the rubber crawler, the vertical surfaces 5a and 5a' collide with each other and collide with each other as in the conventional case. Prevent lateral displacement.

4 to 6 respectively show the overlapping states of the horizontal projections in the second to fourth embodiments of the present invention. The horizontal projections 5 and 5'in the second embodiment shown in FIG. 4 are cored bars. Since both side surfaces of 1a are projected in positions that are symmetrical with respect to each other, that is, both side surfaces have the same configuration, there is no error in arranging the cores in the production process.
Further, the horizontal projections 5 and 5'are formed on the tapered surfaces 5t and 5t 'having a substantially semicircular cross section so that the same operation as that of the horizontal projections can be performed.

In the core metal 1b of the third embodiment shown in FIG. 5, horizontal projections 5 and 5'are formed only on one side of the engaging portion 3 to provide a lighter weight and less expensive core metal. Is possible. Further, in the fourth embodiment of FIG. 6, there is shown a case where two kinds of cored bars 1c and 1d having different protruding positions of the horizontal projections are alternately arranged, and the horizontal projections 5c and 5d are arranged.
c ', 5d, 5d' have a substantially trapezoidal cross section.

FIG. 7 shows a core metal 1e of the fifth embodiment, in which the horizontal projections 5, 5'are tapered in two steps, and one side surface of the horizontal projections 5, 5 '. Are formed on the inclined tapered surfaces 5t and 5t 'similarly to the above.
FIG. 8 shows a sixth embodiment, in which thick portions 8 are formed on both sides of the engaging portion 3 so as to project to positions on the bottom surface slightly below the core metal blade portions 4 and 4. The horizontal projections 5 are made to project to the inside. For this reason, when embedded in the rubber crawler main body, the horizontal protrusions 5 are located closer to the steel cord, and the overlapping interval of the horizontal protrusions does not change significantly.

[0016]

According to the present invention, at least one of both sides of the engaging portion on each side surface in the width direction of the cored bar has a horizontal projection protruding in a direction perpendicular to the side surface of the cored bar, and adjacent horizontal projections are crawler. Since they are arranged at overlapping intervals when viewed in the circumferential direction, even when an external force that causes a lateral displacement is applied to the rubber crawler, overlapping horizontal projections do not collide with each other inside the rubber crawler main body, so that lateral displacement does not occur. Prevents wheel loss.

Further, since a taper surface inclined at a constant angle is formed on the surface of the horizontal projection opposite to the facing surface, even when the core bar is displaced due to an external force to the rubber crawler and is locked, The restoring force due to the rigidity of the rubber crawler makes it possible to easily return to the normal overlapping state, eliminating the risk of hindering the running and work of the rubber crawler, and eliminating the abnormal force on the rubber and core metal. The rubber crawler's life has been extended.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a cored bar according to the present invention.

2A and 2B are views showing an overlapping state of horizontal projections, where A is an enlarged plan view and B is a sectional view taken along line X-X of A;

FIG. 3 shows an abnormal overlapping state of horizontal projections,
Is an enlarged plan view and B is a sectional view taken along line Y-Y of A.

4A and 4B show a core metal of a second embodiment, in which A is a plan view in an arrayed state and B is a cross-sectional view of a horizontal projection.

FIG. 5 is a plan view in which cored bars of a third embodiment are arranged.

6A and 6B show a cored bar according to a fourth embodiment, in which A is a plan view in an arrayed state and B is a sectional view taken along line A (2) ZZ.

FIG. 7 is a plan view in which cored bars of a fifth embodiment are arranged.

FIG. 8 is a side view of a cored bar showing a sixth embodiment.

FIG. 9 is a diagram for explaining derailing of a conventional rubber crawler.

10 is a plan view of the rubber crawler of Japanese Patent Application No. 2-109474, and B is a cross-sectional view in the width direction of the rubber crawler.

FIG. 11 shows an overlapped state of a normal horizontal projection body,
10A is an enlarged view of a portion W in FIG. 10A, and B is a sectional view taken along line XX of A.

FIG. 12 shows an abnormal overlapping state of the horizontal projections,
11A is an enlarged view of the same position as FIG. 11A, and B is a sectional view taken along line YY of A. FIG.

[Explanation of symbols]

 1 core metal 2 corner part 3 engagement part 4 wing part 5, 5'horizontal projection body 8 thick part

Claims (3)

[Claims] 1. A rubber crawler in which a cored bar having an engaging portion for engaging with a drive wheel in the center and a pair of protrusions for preventing derailment on both outsides of the engaging portion is embedded in a belt-shaped elastic body at regular intervals. ,
At least one of both sides of the engaging portion on each of the widthwise both side surfaces of the cored bar has a horizontal projection protruding in a direction perpendicular to the side surface of the cored bar and is opposed to a surface of the horizontal projection opposite to the opposite side. A rubber crawler characterized in that a taper surface inclined by a certain angle is formed on the surface, and adjacent horizontal projections are arranged at intervals so as to overlap each other when viewed in the crawler circumferential direction. 2. The rubber crawler according to claim 1, wherein the horizontal projection is formed at a position approximately flush with the cored bar blade or slightly on the bottom side. 3. A rubber crawler characterized in that a thick portion is formed on both sides of the engaging portion at a bottom surface side position slightly below the core metal blade portion, and a horizontal projection is attached to the portion.