JP2004216936A - Rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate generation of mud balls passing through an engaging hole with a sprocket tooth and to reduce vibration, in a rubber crawler mainly traveling on a swamp. <P>SOLUTION: This rubber crawler is constituted of an endless rubber elastic body, core metal buried at fixed pitch in the longitudinal direction, a steel cord made by being surrounded from the outside in relation to the core metal, an engaging part with a sprocket formed among the core metal and lugs formed on an outer peripheral surface of the endless rubber elastic body. The engaging part with the sprocket is made as a bottomed cavity. It is desirable that the lugs are formed at the outside of the bottomed cavity. The figure shows 1: the rubber elastic body, 2: the core metal, 2a: a center part of the core metal, 2b, 2c: blade parts of the core metal, 2d: a projection, 3: the steel cord, 4a, 4b: the lugs, 50: the cavity, A, B: plane parts. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a novel structure of a rubber crawler, and more particularly to a rubber crawler running mainly on wetlands.
[0002]
[Prior art]
Rubber crawler suitable for traveling in wetlands has a structure in which a core metal is buried at a constant pitch in the longitudinal direction of an endless rubber elastic body, and this outside is surrounded by steel code, and A lug is formed, and an engagement hole for engaging a sprocket is formed between the metal cores so as to penetrate the rubber elastic body.
[0003]
FIG. 8 is a plan view of an inner peripheral side of a conventional rubber crawler, FIG. 9 is a plan view of an outer peripheral side, and FIG. 10 is a sectional view taken along line BB. Numeral 1 denotes a rubber elastic body which is continuous above and below the plane of FIG. Reference numeral 2 denotes a metal core embedded in the rubber elastic body 1 at a constant pitch. The core metal 2 has a central portion which is an engagement portion 2a with a sprocket, and left and right wing portions 2b and 2c are embedded in the rubber elastic body 1. It is buried. Reference numeral 3 denotes a steel cord buried outside the wing portion 2b. Further, a pair of protrusions 2 d protruding from the metal core 2 to the inside of the rubber elastic body 1 are provided. 4a and 4b are linear lugs provided on the outer peripheral side of the rubber elastic body 1, and long and short lugs 4a and 4b are arranged alternately. Reference numeral 5 denotes an engagement hole with the sprocket, which is formed between the central portions 2a, 2a of the adjacent metal cores 2, 2, and formed through the inner and outer surfaces of the rubber elastic body 1.
[0004]
[Problems to be solved by the invention]
However, the drawbacks of this type of conventional rubber crawler are vibration to the operator and generation of mud balls passing through the engagement holes 5. In the former case, when the rolling wheel 10 rolling on the inner peripheral surface of the rubber crawler is on the lugs 4a and 4b and when it is in between, it is alternately when it is on the lugs 4a and 4b. In this case, the case where there is support with respect to the ground surface and the case where there is no support come alternately, so that the rolling wheel 10 moves up and down, and the occurrence of vibration is inevitable.
[0005]
Further, since the mud attached to the vicinity of the engagement hole 5 is pressed by the sprocket teeth 20 and solidifies, and the solid is dropped into the shape of a sludge, the sludge may fall on other crops. Was not.
[0006]
[Means for Solving the Problems]
The present invention has been made in view of the prior art as described above, and the gist of the invention is that an endless rubber elastic body, a core metal buried with a constant pitch in the longitudinal direction, and an outer side with respect to the core metal. A rubber crawler comprising: a steel cord that surrounds; an engagement portion of a sprocket formed between a metal core; and a lug formed on an outer peripheral surface of an endless rubber elastic body. Is characterized in that it has a bottomed recess.
[0007]
The lug is preferably formed outside the bottomed depression. More specifically, the lug is arranged obliquely in the width direction of the rubber elastic body, and furthermore, in the width direction of the rubber elastic body. Is a rubber crawler in which long lugs reaching the widthwise end and short lugs interrupted halfway are alternately arranged in left and right half views.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The greatest feature of the present invention is that the engagement portion with the sprocket has a bottomed recess. In this type of conventional rubber crawler, the engagement portion with the sprocket always has a structure that penetrates the inner and outer surfaces. For this reason, it was pointed out that the mud that passed through the engagement hole was beaded and discharged to the outside, and was dropped on the next crop. Emissions were eliminated. It was thought that mud, etc., would accumulate in such bottomed pits, but in the case of rubber crawlers that mainly run on wetlands, any mud that enters the pits contains a lot of moisture. However, it has been found that the resin does not solidify in the depression and is sufficiently practical.
[0009]
As described above, another feature of the engagement hole being the bottomed recess is that the lug formed on the outer peripheral side of the rubber elastic body can be arranged at an arbitrary position. That is, in the conventional rubber crawler, the engagement holes were always present at a constant pitch, so that the degree of freedom in the arrangement of the lugs was small. The degree of freedom of arrangement became extremely high. Therefore, for example, regardless of whether measures are taken to prevent vibration or increase the propulsion, it is possible to select a lug suitable for the purpose.
[0010]
Note that, although the engagement portion with the sprocket has a bottomed depression, the rubber thickness of the bottomed depression is not so large. Therefore, the portion corresponding to the recessed portion of the rubber elastic body may be slightly overlaid. To further mention this point, it is recommended to provide a lug corresponding to the portion of the bottomed depression.
[0011]
Speaking of such lugs, in order to reduce the occurrence of vibration, the rubber elastic bodies are arranged inclined in the width direction, and furthermore, it is necessary to remove mud on the outer surface of the rubber crawler in order to increase the propulsive force. For this purpose, when viewed in the left and right half views in the width direction of the rubber elastic body, a lug (long lug) reaching the width direction end of the rubber elastic body and a lug interrupted halfway (short lug) alternately. It is preferable that the rubber crawlers are arranged.
[0012]
By making the lug the same structure as the former, when the rolling wheel that causes vibration occurs, this rolling wheel is always on the lug, so the up and down movement of the rolling wheel is reduced, and as a result, the generation of vibration On the other hand, by adopting the latter structure, the mud sandwiched between the lugs is urged to peel off and drop a part of the mud, which leads to an improvement in propulsion.
[0013]
【Example】
Hereinafter, the rubber roller of 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 first example of a rubber crawler of the present invention, FIG. 2 is a plan view of an outer peripheral side, and FIG. 3 is a sectional view taken along line AA. FIG. 4 is an enlarged cross-sectional view in the longitudinal direction of the recess, and FIG. 5 is an enlarged cross-sectional view in the width direction.
[0014]
In the figure, reference numeral 1 denotes a rubber elastic body forming a base of a rubber crawler, which is connected endlessly in the vertical direction in the figure. Reference numeral 2 denotes a metal core embedded in the rubber elastic body, which is embedded at a constant pitch in the longitudinal direction of the rubber elastic body 1. The left and right wing portions 2b and 2c of the core metal 2 are embedded in the rubber elastic body, and the central portion 2a is a portion that engages with the sprocket teeth 20. In the metal core 2, a pair of protrusions 2 d are provided upright with the central portion 2 a interposed therebetween, and project from the inner surface of the rubber elastic body 1. Reference numeral 3 denotes a steel cord which wraps around the outer peripheral side of the cored bar 2 and is embedded in the rubber elastic body 1 in the longitudinal direction. Reference numeral 50 denotes a recess formed between the central portion 2a of the cored bar 2 and the sprocket tooth 20, and has a bottomed structure that does not penetrate the inner and outer surfaces.
[0015]
The relationship between the recess 50 and the sprocket teeth 20 is formed slightly deeper (D) than the tooth height (H) of the sprocket teeth 20, and the sprocket teeth 20 contact the central portion 2 a of the cored bar 2 during traveling. , who does not contact the inner surface 50 ₀ of the recess 50 is preferred.
[0016]
On the other hand, the lugs 4a and 4b have long and short lugs alternately arranged in the width direction of the rubber crawler. Both of them have a mountain shape at the center thereof, and the lugs 4a and 4b have the shape of closing the bottomed recess 50 at the top of the mountain shape. 4b is arranged. The lugs 4a and 4b are gently inclined left and right from the top, the lugs 4a further extend horizontally in the width direction to form long lugs, and the lugs 4b are short lugs that end with a gentle inclination.
[0017]
The rolling wheel 10 shown by the dotted line runs on the inner surface of the rubber crawler over the projection 2d, and runs while riding on the lugs 4a and 4b one after another. Since the distance between the lugs 4a and 4b in the running area is relatively narrow, the up and down movement of the rolling wheel 10 is relatively small.
[0018]
On the other hand, in the lugs 4a and 4b, unlike the lug 4a, the tip of the lug 4b lacks a horizontal portion. Therefore, the planes A and B surrounded by the tip of the lug 4b and the horizontal portion of the lug 4a have a relatively large gap between the lugs. For this reason, even if the mud sandwiched between them is lifted together with the rubber crawler, the mud is easily separated and falls. When the rubber crawler comes in contact with the ground again, since the mud does not adhere to the horizontal portion of the lug 4a, a propulsive force is applied. If the mud is completely clogged between the lugs and touches the ground, there is almost no transmission of propulsion, and the lugs will run idle, but in the case of the present invention, the propulsion will be transmitted reliably. It is. As for the lugs 4a and 4b, the height of the lugs may be all the same, but in the example of the figure, the portion corresponding to the recess 50 of the lug 4a is slightly shorter.
[0019]
FIG. 6 is a plan view of an outer peripheral side of a second example of the rubber crawler of the present invention. In this example, the point of the depression 50 has the same relationship as in the previous example, and the lugs are alternately bent in a “F” shape, and the top corresponds to the depression 50. . The long lug side 14a extends with substantially the same height, and the short lug side 14b gradually becomes shorter in height than the top. The rolling wheel 10 and the mud discharging function are almost the same as those of the rubber crawler described above. The height of the short lug 14b can be the same as the height of the long lug 14a. In some cases, the height of the portion corresponding to the depression 50 can be slightly reduced.
[0020]
FIG. 7 is a plan view of an outer peripheral side of a third example of the rubber crawler of the present invention. In this example, the point of the depression 40 has the same relationship as in the previous example, while the lug 24 has a slanted portion at the center and a horizontal portion at the tip. The slope corresponds to the depression 50. The side with the horizontal portion is the long lug side 24a, and the side without the horizontal portion is the short lug 24b. The height of the lug 24 is almost the same, but the height of the portion corresponding to the recess 50 can be slightly reduced. The functions of the rolling wheel 10 and the mud discharging function are substantially the same as those of the rubber crawler described above, and therefore, description thereof is omitted.
[0021]
【The invention's effect】
As described above, the present invention eliminates the generation of mud balls coming out of the engagement holes, and allows the lugs to be arranged relatively freely, which leads to a reduction in vibration and is a great feature in practical use. And a rubber crawler having the following.
[Brief description of the drawings]
FIG. 1 is an inner peripheral plan view of a first example 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 cross-sectional view taken along line AA.
FIG. 4 is an enlarged cross-sectional view in a longitudinal direction of a recess.
FIG. 5 is an enlarged cross-sectional view in the width direction thereof.
FIG. 6 is an outer peripheral side plan view of a second example of the rubber crawler of the present invention.
FIG. 7 is an outer peripheral side plan view of a third example of the rubber crawler of the present invention.
FIG. 8 is an inner circumferential plan view of the conventional rubber crawler.
FIG. 9 is a plan view of an outer peripheral side of the rubber crawler of FIG. 8;
FIG. 10 is a sectional view taken along line BB.
[Explanation of symbols]
1 ‥ rubber elastic body,
2 ‥ core metal,
2a ‥ Central part of core metal (engagement part with sprocket),
2b, 2c ‥ core metal wings,
2d ‥ projection,
3 ‥ steel code,
4a, 4b, 14a, 14b, 24a, 24b lugs,
5mm engagement hole with sprocket,
10 ‥ wheel,
20 ‥ sprocket teeth,
50 ° depression,
50 ₀ ‥ recesses of the inner surface,
A, B ‥ plane part.

Claims (3)

An endless rubber elastic body, a metal core buried at a constant pitch in the longitudinal direction, a steel cord surrounding the metal core from outside, and engagement of a sprocket formed between the metal cores. And a lug formed on the outer peripheral surface of the endless rubber elastic body, wherein the engaging portion with the sprocket has a bottomed recess. The rubber crawler according to claim 1, wherein the lug is formed outside the bottomed depression. The lugs are arranged obliquely in the width direction of the rubber elastic body.Furthermore, in the left and right half views in the width direction of the rubber elastic body, a long lug reaching the width direction end and a short lug interrupted halfway alternately. The rubber crawler according to claim 1 or 2, which is disposed.

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