JPH09226639A - Rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a derailing preventing mechanism, relating to a structure of a rubber crawlar. SOLUTION: In a rubber crawler formed by an endless rubber elastic unit and a core metal 2 by enveloping this core metal 2, a swollen part 10 is formed from the core metal 2 buried adjacent to each other toward the other core metal 2, this swollen part 10 is opposed, further with its tip and in a male/ female nest shape, a female side recessed part is opened to an outside (lug side), this opening part is formed in size passing through a male side protruded part, an inside (internal peripheral surface side) has a shape incapable of passing through the male side protruded part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a rubber crawler, and more particularly to a rubber crawler having an improved wheel release preventing mechanism.

[0002]

2. Description of the Related Art In recent years, rubber crawlers have come to be widely used not only for agricultural machines but also for running parts of construction and civil engineering machines. Such a rubber crawler is composed of a cored bar which is embedded side by side in the width direction in an endless rubber elastic body, and a steel cord which surrounds the cored bar.

However, the core metal used here is
Generally, the center part is the engagement part with the sprocket, the left and right wings are embedded in the rubber, there is no restriction on the movement between the adjacent cores, and the movement of the rubber elastic body The core metal was supposed to make its own movement within the range of gain. For example, there are swaying back and forth, passing up and down, and tilting when passing a rolling wheel or riding on a small stone.
Further, it is a lateral displacement of the cored bar during turning or traveling on a sloping ground, and in some cases, a reverse bending phenomenon of the rubber crawler is also induced.

To solve these problems, Japanese Unexamined Patent Publication No.
No. 58357 and No. Kaikai 5-92077 are proposed. In these proposals, in order to prevent the adverse effects of the core metal in the rubber elastic body based on these behaviors, the movement of the core metal embedded in the rubber elastic body between adjacent core metals is prevented. It is proposed to have a structure in which they are compatible with each other. However, the core metal of this proposal has a bulge part formed in front of and behind the wing part, and the tips of the bulge parts of the adjacent metal cores are in a male-female perfect nesting shape vertically and horizontally. -It took a lot of time to assemble adjacent cores during the manufacturing process.

FIG. 11 is a perspective view showing a convex portion 41 and a concave portion 42 at the tip of the bulging portion of the cored bar 30 in the above proposal. And, FIG. 12 shows a cored bar 30 adopting the tip of the bulging portion of FIG.
FIG. In the figure, reference numeral 30 is a core metal, which is provided with wing portions 31 on both sides thereof, and a central portion sandwiched by the wing portions 31 is an engagement portion 32 with a sprocket. Further, a pair of corner portions 33, 34 protruding from the inner peripheral surface of the rubber crawler sandwiching the engaging portion 32 are provided. In the cored bar 30, the bulging portion 3 is provided outside the wing portion 31.
5 and 36 are formed, and a quadrangular pyramid-shaped convex portion 41 and a concave portion 42 which are fitted to each other are provided at the tips thereof.

However, the convex portion 4 at the tip of the bulging portions 35, 36
Since the 1 and the recess 42 are completely fitted to each other in all directions, at the time of manufacturing the rubber crawler, the adjacent cored bar 3
The convex portion 4 formed at the tip of the bulging portions 35 and 36 between 0 and 30
It was very difficult to assemble the rubber crawler into the mold while fitting the 1 and the recess 42 together.

On the other hand, the male and female nesting structure is difficult to be released by the movement of the core bar in the inner and outer surface directions of the rubber crawler when it is wound around a sprocket or an idler. Since the male and female nests prevent the rubber crawlers from deforming in the inner and outer surface directions, it is difficult to relax the input to the rubber crawlers in some cases, and it cannot be denied that the durability of the rubber crawlers is reduced.

In order to solve these drawbacks, the male and female nesting shapes are changed to form a mountain shape 41 _{1 in} which the tip of the convex portion 41 has the same shape in the vertical direction as shown in FIG. V-shaped recess 42 ₂ that fits in the mold 41 ₁ and the core metal 3
0 ₁ has already been provided. In the previously proposed cored bar, a structure in which adjacent cored bars interfere with each other has a structure in which the bulges can be moved in the vertical direction. It is possible to prevent the slippage of the swelling, and it is easy to engage the bulging portion during manufacturing, particularly in the endless process. However,
Since the bulging portion has such a shape, it is also apparent that the movement of the cored bar due to this engagement cannot be prevented when the rubber crawler is reversely bent or twisted. That is, for example, with respect to the vertical movement of the cored bar, the bulging portions of the adjacent cored bars do not interfere with each other, and the movements become free, and the wheel removal preventing function may be reduced by half. It is a fact.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional techniques, and a rubber black
The adjacent cores embedded in the racks interfere with each other against the behavior of the rubber crawlers moving inwardly and outwardly, that is, in the vertical direction, leftward and rightward or backward, and interfere with each other. (EN) Provided is a rubber crawler using a cored bar that facilitates the work of engaging the cored bar.

[0010]

SUMMARY OF THE INVENTION According to the present invention, an endless rubber elastic body, a cored bar which is embedded side by side in the width direction, and a cored bar which surrounds the cored bar and surrounds the cored bar in the same manner. A rubber crawler consisting of a steel cord embedded in the core cord, wherein a bulging portion is formed from the core metal embedded adjacent to the other core metal, and the bulge portion is formed. Face each other, and make the tips of the male and female nests, the concave portion on the female side is opened to the outside (the lug side), and the opening portion has a size that passes through the convex portion on the male side,
A rubber crawler characterized by having a shape in which a male side convex portion cannot pass on the inside (inner peripheral surface side), and a preferable aspect is that the female side concave portion is opened inward and outward of the rubber crawler, The inner open portion is sized so that the male convex portion does not pass through, and the outer open portion is sized so as to pass through the male convex portion.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In general, a rubber crawler is subjected to a combination of lateral deformation, height direction (vertical direction), twist deformation and reverse bending simultaneously, which reduces the interference function of the meshing portion and causes derailing. Will lead to. The present invention has been made in order to solve such a drawback, and the greatest feature is a shape in which the male and female uneven portions interfere with relative vertical movement of the core metal, left and right, and front and rear movements. It is a rubber crawler that does not have to be installed and the work of fitting the uneven portion is extremely easy.
As a more preferable example, the concave portion of the bulging portion extending from the core bar is opened vertically, the inner open portion of the rubber crawler is sized not to pass the convex portion, and the outer open portion passes the convex portion. It is just the size. Therefore, during the endless process of the rubber crawler, not only fitting the concave and convex portions of the two is extremely easy, but also the rubber crawler is fitted.
There is an advantage that the bulging portion does not come off even if the latitudinal bending or twisting occurs and the vertical movement occurs.

To further describe the present invention, since the concave portion on the female side is opened to the outside (the lug side), the work of fitting the concave and convex portion can be facilitated. Therefore, when the rubber crawler is wrapped around the idler and the sprocket, the male and female uneven portions do not interfere with each other, and therefore the idler and the sprocket are smoothly wrapped around the idler and the sprocket, resulting in no loss of driving force. Further, the male and female uneven portions interfere with relative vertical movements, left and right front and rear movements, and tilt movements between the adjacent cores, which causes reverse bending and twisting of the rubber crawler. There is a feature that the bulging portion does not come off even if the bulging portion is caused to move up and down. In order to prevent the rubber from entering the recess at the tip of the bulging portion during the vulcanization molding of the rubber crawler, a convex shape is formed in the mold for this portion, and the rubber is vulcanized in the state of engaging with the recess. Good.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a plan view of an inner peripheral surface side of a preferred embodiment of a rubber crawler of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. Further, FIG. 3 is a plan view of the inner peripheral surface side in which only the core metal is taken out, FIG. 4 is a front view thereof, and FIG. 5 is a sectional view of a main part.
In this example, the uneven portion formed on the bulging portion is an example embedded in the rubber crawler, but in some cases, the rubber of the uneven portion (engaging portion) may be eliminated, Further, it is also possible to reduce the concentration of stress by thinning the rubber portion in the uneven portion and the vicinity thereof or forming a groove at the boundary portion between the two. In the figure, reference numeral 1 is a rubber elastic body, 2 is a core metal, and 3 is a wing portion of the core metal 2. A steel cord 4 is embedded in the rubber elastic body 1 so as to surround the wing portion 3. In addition, 5 is a sprocket hole, 6 is a sprocket engaging portion, and 7 and 8 are corners for preventing the wheels from coming off from the wheel.

In the core metal 2 of this embodiment, however, bulges 9 and 10 are formed immediately below the corners 7 and 8 in the front-rear direction of the core metal 2, and the bulges 9 and 10 are formed. One end of 10 has a convex portion 11 and the other end has a concave portion 12. The cross section of the convex portion 11 has an upward triangular shape, while the concave portion 12 is divided into left and right parts so that the inner releasing portion 12 ₁ is smaller and the outer opening portion 12 ₂ is larger. . Therefore, the concave portion 12 forms a space having a substantially triangular trapezoidal shape upward, and has a shape in which the convex portion 11 having a triangular cross-section is fitted. And the convex portion 11
The convex portion 11 has a shape such that it does not protrude even when is moved upward. Since the convex portion 11 has a shape that can be easily protruded from the lower side of the concave portion 12, it can be easily wound around a sprocket or an idler, and can be extremely easily incorporated during endless molding.

By sequentially embedding the core metal 2 having such bulging portions 9 and 10 in rubber, the convex portion 11 at the tip of the bulging portion is successively fitted into the concave portion 12 at the tip of the bulging portion. .., contact and collide with each other to control the movement of the cored bar 2. The steel cord 4 surrounds the wing portion 3 of the core metal 2 and is embedded in the rubber elastic body 1. Generally, even if an unexpected external force acts on the core metal 2, the outer peripheral side The movement to the inner side is much larger than that to the inner side. Therefore, even if the opening 12 _{2 on} the outer side of the recess 12 is wide open, the two do not separate from this direction.

FIG. 6 is a sectional view similar to FIG. 5 showing another example of the cored bar 2, and FIGS. 7 to 9 are sectional views of still another example.
In the example in FIG. 6, the cross-sectional shape of the convex portion 11 is a semi-circular cross-section with an upwardly curved surface, while the concave portion 12 has a small opening 12 ₁ inside (upper) and a large opening outside (lower). has become airspace of the inner surface substantially semicircular shape with 12 _2,
Similarly to the previous example, when the convex portion 11 moves relatively upward, the movement is blocked without slipping out from the inner open portion 12 ₁ , while the convex portion 11 is easily formed in the outer open portion 12 _2. It has a structure that can be inserted. Further, there is an advantage that the bulging portion is less worn because it interferes with a wide surface. Furthermore, the section modulus is large and the strength of the convex portion is high.

In FIG. 7, the convex portion 11 has a cross-sectional shape in which inclined surfaces 11 ₁ and 11 ₂ are formed on the upper left and right sides,
On the other hand, the recess 12 is an air space having inner surfaces 12 ₃ and 12 ₄ facing the inclined surfaces 11 ₁ and 11 ₂ , and the behaviors of both are the same as in the previous example.

In FIG. 8, the convex portion 11 has a stepped shape, while the concave portion 12 has an inverted stepped surface. FIG.
The convex portion 11 has a taper step, while the concave portion 12 has a taper reverse step surface. Further, FIG. 10 shows still another example, in which the open portion (1
2 ₁ ) is not formed, so that the structure is configured to prevent passage of the convex portion 11.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of an inner peripheral surface side of a cored bar of the rubber crawler in FIG.

FIG. 4 is a front view of the cored bar in FIG.

5 is a cross-sectional view of a main part of the cored bar shown in FIG.

FIG. 6 is a sectional view similar to FIG. 5, showing an example of another cored bar of the present invention.

FIG. 7 is a sectional view similar to FIG. 5, showing a third example of the cored bar of the present invention.

FIG. 8 is a sectional view similar to FIG. 5, showing a fourth example of the cored bar of the present invention.

FIG. 9 is a sectional view similar to FIG. 5, showing a fifth example of the cored bar of the present invention.

10 is a sectional view similar to FIG. 5, showing a sixth example of the cored bar of the present invention.

FIG. 11 is a partial perspective view of a conventional cored bar.

FIG. 12 is a bottom view of the cored bar of FIG. 11.

FIG. 13 is a plan view of the inner circumference side of a previously proposed cored bar.

[Explanation of symbols]

1 ... Rubber elastic body, 2 ... Mandrel, 3 ... Mandrel blade, 4 ... Steel cord, 9, 10 ... Mandrel bulging part, 11 ... Convex part, 12 Recessed portion, 12 ₁ ...... Inner open portion, 12 ₂ ...... Outer open portion.

Claims (2)

[Claims] 1. An endless rubber elastic body, a core metal which is embedded side by side in the width direction thereof, and a steel cord which is also embedded in rubber so as to surround the core metal. And a bulging portion is formed from the core metal embedded adjacently to the other core metal, the bulging parts are opposed to each other, and the tips thereof are male and female. The female side concave part is opened to the outside (lug side), and this open part is large enough to pass the male side convex part, and the male side convex part passes to the inner side (inner peripheral surface side). A rubber crawler characterized by having a shape that cannot be obtained. 2. A female-side concave portion is opened inward and outward from the rubber crawler, an inner-side opened portion has a size such that a male-side convex portion does not pass through, and an outer-side open portion passes through a male-side convex portion. A rubber crawler according to claim 1,