JP2000159160A - Rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the generation of crack by providing a core with wing parts extended in right and left more than a pair of projections for pinching a sprocket engagement part and projecting parts projected forward and backward from the wing part corresponding to the rolling traveling part of the rolling wheel, and embedding the core in a rubber elastic body. SOLUTION: A core 1 is formed with an engagement part 2 to be engaged with a sprocket at a central part thereof and a pair of projections 3 in both sides of the engagement part 2. A wing part 4 is formed outside of the projections 3, and the wing part 4 is formed with projecting part 5 projected forward and backward from the wing part 4 adjacent to the projections 3. At the time of embedding the core in a rubber elastic body, the projections 3 are projected from the inner peripheral surface so as to prevent the removal of the rolling wheel, and the wing part 4 and the projecting part 5 are embedded in the rubber elastic body so that the cores 1 are arranged with a constant pitch. With this structure, contact of both the metals of the rolling wheel and the core 1 is avoided, the vertical movement of the rolling wheel is lowered, lifetime is remarkably improved, and lowering of the vibration of a machinery can be realized.

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. FIG. 10 is an inner peripheral side plan view showing an example of the conventional rubber crawler, and FIG. 11 is a cross-sectional view in the width direction. In the figure,
A core metal 50 is embedded in the rubber crawler 40 at a constant pitch, and the outside thereof is surrounded by a steel code 41. The center of the metal core 50 is a sprocket engagement part 51,
The rubber crawler 40 is sandwiched between the sprocket engagement portions 51.
A pair of projections 52, 52 protruding from the inner peripheral surface of the vehicle, and, in some cases, rolling wheel running parts 53, 53 are formed on the outside thereof, and wing parts 54, 54 embedded in the rubber It is growing. The one on which the wheel running portions 53 are formed is usually exposed on the inner peripheral surface of the rubber crawler 40.

In this conventional rubber crawler, the rolling portion 61 of the rolling wheel 60 runs on the inner peripheral surface of the rubber crawler. Money 50
When the rolling wheel 60 runs off the rubber portion out of the range, the rubber portion is greatly deformed by the load, so that the vertical movement (vibration) of the rolling wheel 60 cannot be avoided. Therefore, the wheel 6
It is necessary to make the spring property of the running surface on which 0 rolls as uniform as possible. For this reason, an attempt has been made to reduce the rubber portion of the running surface. Many. In this case, as a result, the spring property between the cores (running parts of the wheel) of the rubber crawler is hardened, and the fall of the wheel between the metal cores is reduced by making the spring property as uniform as possible. effective.

However, since rolling wheels are usually manufactured without heat treatment by press working or casting,
There is a drawback that the contact with the rolling portion of the core metal (the portion exposed from the inner peripheral surface of the rubber crawler) causes wear, cracks, and the like, and the durability is poor. It goes without saying that wear and cracks in the parts also occur.

[0005] To solve this problem, the present applicant has proposed a new rubber-roller core metal and rubber-roller. That is, a central portion is an engagement portion with the sprocket, a pair of projections is formed with the engagement portion therebetween, and a wing portion is formed outside the projection. In each of the above-mentioned embodiments, a core metal having a protruding portion is used, and all parts except the projection and the sprocket engaging portion are embedded in a rubber elastic body of a rubber crawler.

[0006] The overhanging portion extends substantially in front of and behind the wing portion with a substantially equal length, and the protrusion-side tip (ie, the inner circumferential end of the rubber crawler) has an inner circumferential surface of the wing portion. 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, the movement of the core metal in the rubber due to the passage of the rolling wheels is suppressed, and a large vibration preventing effect is brought about. However, the tip of the overhang is located near the inner peripheral surface of the rubber crawler. The thickness of the rubber between the rolling wheel and the tip of this overhang is relatively thin, so that the strain is concentrated on the rubber at this location, and cracks occur due to rubber fatigue. I will.

[0008]

SUMMARY OF THE INVENTION The present invention is to improve the cracks of the rubber crawler described above and to improve the structure of the core metal.

[0009]

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 A wing portion extending to the left and right, and an overhang portion extending from the wing portion corresponding to the rolling traveling portion of the rolling wheel toward the front and rear thereof, wherein the wing portion and the overhang portion of the cored bar are made of rubber elastic material. And a flat surface is formed at the inner peripheral end of the rubber crawler of the overhanging portion. Specifically, the protrusion-side end of the overhanging portion is a wing portion. It is located inside the plane.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rubber crawler having the above-mentioned structure. And the wings and the overhang are buried in the rubber with the projection-side tip positioned inside the wing surface, and preferably, a flat surface is formed on the inner peripheral side of the tip of the overhang. When the rolling wheel rolls, distortion is not concentrated on the tip of the overhang portion, and rubber cracks do not occur on the inner peripheral surface of the rubber crawler.

When the rolling wheel travels 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. Is to position the protruding end of the overhang part inside the wing surface, and to keep the running direction of the rolling wheel almost constant even when the wing moves back and forth to eliminate vertical movement. . In addition, the overhang portion is usually overhanging toward the front and back of the wing portion, but it may overhang only on one side to the front or back, and may overhang one side forward and the other over the staggered shape. It is possible.

[0012]

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 so as to correspond to the running part of the moving part. In particular, a flat part 6 is formed inside the tip of the overhang parts 5, 5 to disperse the distortion during rolling of the rolling wheel and to reduce rubber fatigue. And cracks in the rubber are prevented.

In this example, the overhang portions 5 and 5 are wing portions 4 and
4, and projecting with an equal length before and after, and more specifically, the tip on the projection side (that is, the tip on the inner peripheral side in the rubber crawler) is located inside the inner peripheral surface of the wing portion 4. is there. 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 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 extremely reduced.

The core metal 1 used in the present invention has, for example, a width W of both ends of the overhang portions 5 and 60 of 60 mm, a 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 front-rear width L of the overhang portion 5 is 12.5 mm.
The height difference A between the horizontal inner surface of the wing 4 of the cored bar 1 and the horizontal position of the end of the overhang 5, that is, the protrusion-side tip of the overhang 5 is
Are located inside the inner surface of the, and 5 mm at the center thereof. 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 crawler of the present invention using the cored bar shown in FIGS. 1 to 6, and FIG. FIG. 9 is a cross-sectional view taken along line DD of FIG. In the figure, reference numeral 1
Reference numeral 1 denotes a rubber crawler having a width of 400 mm, in which a large number of metal cores 1 have a constant pitch, in this example, an embedded pitch P of the metal cores 1.
Are arranged with 84 mm. That is, the wing portions 4, 4 and the overhang portions 5, 5 of the cored bar 1 are buried in the rubber elastic body 12, and the central sprocket engaging portion 2 is continuously exposed at the center in the width direction. The protrusions 3, 3, 7, and 7 are rubber clocks.
It protrudes from the inner peripheral surface of the rubber 11. A sprocket engaging hole 13 is formed by the sprocket engaging portions 2 and 2, and a steel cord 14 is embedded in the rubber elastic body 12 so as to surround the wing portions 4 and 4 and the overhang portions 5 and 5. ing. still,
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. Is 3 to 5 mm, though it depends on the size of the rubber crawler. Reference numeral 15 denotes a rubber lug.

The rubber crawler according to the present invention has the above-described structure, and the rolling portion 21 of the outer wheel 20 has a rubber crawler 11.
When the core 1 rolls in the rubber elastic body due to the rolling of the rolling wheel 20 when the inner peripheral surface of the roller is rolled, the presence of the overhang portion 5 formed on the core 1 and, preferably, The tip is a metal core 1
The vertical movement is further reduced by being positioned inside the plane of the wing portion 4 of the wing portion 4, and the concentration of distortion is avoided because the flat portion 6 faces the rolling wheel. It has become.

The overhanging portion 5 of the core bar 1 is buried in rubber and does not directly contact the rolling portion 21 of the rolling wheel 20. And the life as a rubber roller is significantly extended. In the case where a metal core provided with the second protrusions 6 is used, the movement of the rolling wheel 20 to be shifted outward is restricted by the second protrusions 6. The occurrence of derailing is extremely low.

[0019]

According to the rubber roller of the present invention, the contact between the metal of the wheel and the core metal is avoided, and the vertical movement of the wheel is reduced, so that the life of the rubber roller is reduced. Is significantly improved, and the vibration of the body is reduced.

[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 side view showing a relationship between a cored bar and a wheel in FIG. 7;

FIG. 9 is a sectional view taken along line DD in FIG. 7;

FIG. 10 is an inner peripheral plan view showing an example of a conventional rubber crawler.

FIG. 11 is a cross-sectional view in the width direction of FIG. 10;

[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 -Roller, 12 弾 性 rubber elastic body, 13 ‥ sprocket engagement hole, 14 コ steel cord, 15 ‥ lug, 20 ‥ outer wheel, 21 ‥ outer wheel rolling part, 30 ‥ sprocket.

Claims (2)

[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. And an overhanging overhang, comprising a wing portion and an overhang of the core metal embedded in a rubber elastic body,
A rubber surface, wherein a flat surface is formed at an inner circumferential end of the rubber roller of the overhang portion. 2. The rubber crawler according to claim 1, wherein the protrusion-side tip of the overhanging portion is located inside the wing surface.