JP2000118453A - Rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a crack of a rubber crawler by constituting core metal of the sprocket engaging part, the blade parts and the overhang parts, and forming the padding parts for covering this on the outer peripheral surface of the rubber crawler in response to the overhang parts. SOLUTION: The blade parts 4, 4 and the overhang parts 5, 5 of core metal are embedded in a rubber elastic body 12, and padding parts 16 are formed on the outer peripheral surface of this rubber crawler 11. Thus, when the rolling part of an outer rolling wheel rolls on the inner peripheral surface of the rubber crawler 11, even in the case of swinging in the rubber elastic body 12 by rolling of the rolling wheel of the core metal, a vertical movement of the rolling wheel is reduced by the presence of the overhang parts 5 formed in the core metal, and since the padding parts 16 are formed on the outer peripheral surface of the rubber crawler 11, the occurrence of an external flaw of the outer peripheral surface of the rubber crawler 11 is reduced. When using core metal having second projections 6, 6, since a movement for trying to outward dislocate the rolling wheel is regulated by these second projections 6, 6, the occurrence of derailment is extremely reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber roller having low vibration.

[0002]

2. Description of the Related Art In recent years, rubber crawlers have been widely used in place of iron crawlers in running parts of construction vehicles and civil engineering work vehicles. In a conventional rubber crawler, a metal core is buried at a constant pitch, and the outside thereof is surrounded by a steel cord. The core metal has a sprocket engaging portion at the center, and a pair of protrusions protruding from the inner peripheral surface of the rubber crawler with the sprocket engaging portion interposed therebetween, and, in some cases, a rolling wheel running portion is formed on the outside thereof, Further, the wings embedded in the rubber crawler extend left and right.

[0003] In this conventional rubber crawler, the rolling wheel runs on the inner peripheral surface of the rubber crawler.
When the rolling wheel runs on the rubber portion after swinging in the roller or deviating from the core metal, the rubber portion is largely deformed by the load, so that the vertical motion (vibration) of the rolling wheel cannot be avoided. For this reason, it is necessary to make the spring property of the running surface on which the rolling wheel rolls as uniform as possible. For this reason, attempts have been made to reduce the rubber portion of the running surface. That is, as an example of reducing the fall of the rolling wheel between the metal cores, the central portion of the metal core is an engagement portion with the sprocket, and a pair of projections is formed sandwiching this,
A wing is formed on the outer side of the projection, and a metal core having a projection formed on both sides of the wing adjacent to the projection and adjacent to the projection is used. -A structure embedded in the rubber elastic body of the rubber.

[0004] The overhanging portion extends substantially in front of and behind the wing portion with a substantially equal length, and its protruding tip (that is, the inner peripheral tip of the rubber crawler) has an inner peripheral surface. The outer surface of the overhang is a curved surface when viewed from the side of the core metal, and the vicinity of the outer tip is at least a curved surface in relation to the steel code. It is.

However, considering the movement of the core metal in the rubber due to the passage of the rolling wheel, it is natural that the tip of the overhang moves most. Normally, a rubber lug is formed on the outer peripheral surface of the rubber crawler corresponding to the wing portion of the core metal, and the wing portion and the outer peripheral surface of the rubber are relatively thick, but they protrude forward and backward from the wing portion. There is no rubber lug in the overhang, and the thickness of the rubber between them is relatively thin. Therefore, when the protrusion on the road surface and the overhanging portion coincide with each other during traveling, a large shearing force is applied to the rubber therebetween, which causes an injury to this portion.

[0006]

SUMMARY OF THE INVENTION The present invention is to improve the cracks in the rubber crawler described above, and for this purpose, measures are taken on the outer peripheral surface of the rubber crawler.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the gist of the present invention is that a core is embedded at a constant pitch in the longitudinal direction of an endless rubber elastic body. A rubber crawler in which a steel cord is buried around the rubber elastic body in a longitudinal direction of the rubber elastic body, wherein the core metal has a sprocket engagement portion, a pair of projections sandwiching the sprocket engagement portion, and The wings extend to the left and right, and the wings corresponding to the rolling running parts of the rolling wheels are extended from the wing toward the front and rear thereof. It is characterized in that a built-up portion covering this is formed.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rubber crawler having the above-mentioned structure. Preferably, the projection side tip is located inside the wing surface and the wing and the overhang are embedded in the rubber, and the overlay is formed corresponding to the tip of the overhang. Even when the rolling wheel rolls, distortion due to shearing force is not mainly concentrated on the outer peripheral rubber of the rubber roller corresponding to the tip of the overhang portion, and a rubber crack is generated on the outer peripheral surface of the rubber roller. It is not to be.

The build-up portion is usually made thicker continuously from the side surface of the rubber lug, and may be formed with a gentle slope or curved surface from the side surface of the rubber lug. Is also good.

When the wheel runs on the inner peripheral surface of the rubber crawler, the core metal normally swings back and forth in the direction in which a load is applied. It is preferable that the protrusion-side tip of the overhang portion is located inside the wing surface, and that the running direction of the rolling wheel is substantially constant even when the wing portion is swung back and forth, thereby eliminating vertical movement. Furthermore, the overhanging portion is usually extended toward the front and rear of the wing portion, but it may be overhanging only on one side to the front or back, one may be overhanging forward and the other overhanging in a zigzag manner. It is possible.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a plan view of an inner peripheral side of a core used in the rubber crawler of the present invention, FIG. 2 is a front view of FIG. 1, and FIG.
FIG. 4 is a cross-sectional view taken along line BB of FIG. 1. In the figure, reference numeral 1 denotes a cored bar, and reference numeral 2 denotes an engagement portion with a sprocket located at a central portion of the cored bar 1. Then, a pair of projections 3, 3 are formed with the engagement portion 2 interposed therebetween, and wings 4, 4 are formed outside the projections 3, 3. Are formed on both sides of the wings 4 and 4 adjacent to the wings 4 and 4. The projections 3, 3 project from the inner peripheral surface when buried in the rubber elastic body of the rubber crawler and serve to prevent the rolling wheel from coming off. To be served. The wing portions 4, 4 and the overhang portions 5, 5 are embedded in a rubber elastic body of a rubber crawler and arrange core metals at a constant pitch. It is formed corresponding to the running part of the moving part. In this example, a flat part 6 is formed inside the tips of the projecting parts 5 and 5 to disperse the distortion when rolling the rolling wheel. It reduces rubber fatigue and prevents rubber cracks.

In this example, the overhang portions 5 and 5 are wing portions 4 and
The front end of the wing 4 is located inside the inner peripheral surface of the wing 4.
On the other hand, the outer surfaces of the overhang portions 5, 5 are curved surfaces as viewed from the side surface of the cored bar. In particular, the vicinity of the outer distal end should be at least a curved surface due to the relationship with steel code.

FIG. 5 is a side view of FIG. 1, and FIG. 6 is a cross-sectional view taken along line CC of FIG. As can be seen from these figures, the core metal 1 in this example is provided with second wings 4 and 4 at both ends thereof.
Are formed on the same side as the projections 3, 3. Since the rolling wheel travels between the projections 3 and 7, derailing is reduced.

The core metal 1 used in the present invention has, for example, a distance W between both ends of the overhang portions 5 and 60 of 60 mm, a front-rear width WO of the wing portion 4 of the core metal 1 of 35 mm, and a thickness T of 5 to 7 mm. age,
The width L of the overhang portion 5 was 12.5 mm, and the width Wa in the horizontal direction was 13 mm. The height difference A between the horizontal position of the horizontal inner surface of the wing 4 of the cored bar 1 and the end of the overhang 5 is 5 mm at the center. The flat portion 6 on the inner peripheral side at the tip of the overhang portion 5 is 5 mm.

FIG. 7 is a plan view of the inner peripheral side of the rubber roller of the present invention using the cored bar shown in FIGS. 1 to 6, FIG. 8 is a plan view of the outer peripheral side thereof, and FIG. 9 is a side view thereof. FIG. 10 is a cross-sectional view taken along a line DD, showing a relationship with a wheel from which only a cored bar is taken out. In the figure, reference numeral 11 denotes a rubber cloth having a width of 400 mm.
In this example, a large number of metal cores 1 are arranged at a fixed pitch, in this example, the embedding pitch P of the metal cores 1 is 84 mm. That is, the wing portions 4, 4 and the overhang portions 5, 5 of the cored bar 1 are embedded in the rubber elastic body 12, and the central sprocket engaging portion 2 is continuously exposed at the center in the width direction. Protrusion 3,
3, 7, 7 project from the inner peripheral surface of the rubber roller 11. A sprocket engagement hole 13 is formed by the sprocket engagement portions 2 and 2 and the wing portions 4 and 4 and the overhang portions 5 and 5 are formed.
A steel cord 14 is embedded in the rubber elastic body 12 so as to surround the outside of the rubber elastic body 12. In addition, both ends of the overhang portions 5, 5 are buried in the rubber elastic body with flat portions 6 with respect to the inner peripheral surface without being exposed to the inner peripheral surface. The thickness of the elastic body is 3 to 5 mm, depending on the size of the rubber crawler. Reference numeral 15 denotes a rubber lug.

Reference numeral 16 denotes a built-up portion formed on the outer peripheral surface of the rubber crawler. The overlay 16 is a rubber lug 15
The overhang 5
The height (ha) from the outer peripheral surface of the rubber crawler is 3 mm, and the build-up portion 16 is formed.
The top surface 16a covers the entire area of the overhang portion 5.

FIG. 11 is a view similar to FIG. 9 of a rubber roller according to another embodiment of the present invention. In this example, the build-up portion 16 has a curved surface from the side surface of the rubber lug 15.
Of course, the overlay 16 covers the entire area of the overhang 5.

The rubber roller according to the present invention has the above-described structure, and the rolling portion 21 of the outer wheel 20 is provided with the rubber roller 11.
When rolling the inner peripheral surface of the roller, even if the core metal 1 swings in the rubber elastic body due to the rolling of the roller 20, the vertical movement of the roller due to the presence of the overhang portion 5 formed on the core metal 1. Is reduced, and the built-up portion 1 is provided on the outer peripheral surface of the rubber
6, the occurrence of damage on the outer peripheral surface of the rubber crawler was reduced. Incidentally, the second projections 6, 6
In the case of using the cored bar provided with, the movement of the rolling wheel 20 to shift outward is restricted by the second protrusions 6, so that the occurrence of wheel removal is extremely low.

[0019]

According to the rubber roller of the present invention, the vertical movement of the rolling wheel is reduced, and the life as the rubber roller is remarkably improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an inner peripheral side of a metal core used for a rubber crawler according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a side view of FIG. 1;

FIG. 6 is a sectional view taken along line CC of FIG. 1;

FIG. 7 is a rubber cloth using the cored bar shown in FIG. 1;
FIG. 5 is a plan view of the inner periphery of the la.

FIG. 8 is a plan view of an outer peripheral side of the rubber crawler of FIG. 7;

FIG. 9 is a side sectional view showing a relationship between a cored bar and a rolling wheel in FIG. 7;

FIG. 10 is a sectional view taken along line DD in FIG. 7;

FIG. 11 is a side sectional view showing a relationship between a cored bar and a rolling wheel of another example of the rubber crawler of the present invention.

[Explanation of symbols]

 1 ‥ rubber crawler core, 2 ‥ sprocket engagement portion, 3 ‥ projection, 4 ‥ wing, 5 ‥ overhang, 6 ‥ flat portion at the tip of overhang, 7 ‥ second projection, 11 ‥ rubberラ, 12 ‥ rubber elastic body, 13 ‥ sprocket engagement hole, 14 ‥ steel cord, 15 ‥ lug, 16 ‥ overlay, 20 ‥ abduction wheel, 21 ‥ a rolling portion of abduction wheel, 30 ‥ sprocket.

Claims (1)

[Claims] An endless rubber elastic body is provided with a metal core embedded at a constant pitch in the longitudinal direction, and a steel cord surrounding the metal core and having a steel cord embedded in a longitudinal direction of the rubber elastic body. The core metal is a sprocket engagement portion, a pair of projections sandwiching the sprocket engagement portion, a wing portion extending further left and right by this, and a wing portion corresponding to the rolling traveling portion of the rolling wheel toward the front and rear thereof. A rubber crawler, comprising a protruding portion, and a built-up portion covering the outer peripheral surface of the rubber crawler corresponding to the protruding portion.