JPH06247352A - Structure of rubber crawler - Google Patents

Abstract

PURPOSE:To reduce vibration, to make a rubber crawler lightweight and to reduce noise by improving corner portions each of which projects onto the inner peripheral surface of the rubber crawler. CONSTITUTION:In a rubber crawler, wherein pieces of core metal 22 are embedded at fixed intervals in endless elastic rubber 21 with the center of each piece of core metal formed into a sprocket engagement portion 23, and right and left corner portions 27, 28 extending from the pieces of core metal with the engagement portion therebetween are arranged zigzag along the longitudinal direction of the endless elastic rubber and are projected as a whole in two lines extending in the longitudinal direction of the endless elastic rubber, the height of each of top faces at the zigzag ends of both corner portions arranged zigzag is increased and a dent 29, 30 is formed in the top face of each corner portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rubber crawler, and more particularly, it is intended to reduce vibration and reduce weight by improving a corner portion protruding from an inner peripheral surface of the rubber crawler. In some cases, it also leads to noise reduction.

[0002]

2. Description of the Related Art Conventionally, rubber crawlers have been widely used for running parts of agricultural machines, but in recent years, they have also been used for running parts of construction machines and civil engineering machines. However, in the running part of this construction machine or civil engineering work machine, it is generally desired to use it together with an iron shoe crawler. In many cases, it rolls on the corners protruding from the inner peripheral surface.

[0003]

However, since the diameter of the rolling wheel is relatively small, when the rolling wheel moves from one corner to the next corner, the rolling wheel once falls from the corner. ,
Then, the operation of transferring to the adjacent corner is repeated. This means that when the rubber crawlers are viewed from the side, the rolling wheels are constantly moving up and down, which causes vibrations in the machine body, which gives a comfortable ride to the operator. I couldn't say that.

As measures against this, although both corners have long top faces according to the rolling direction of the rolling wheels, and the left and right corners are arranged in a staggered manner, it has been devised. Not enough rubber crawlers have been proposed. FIG. 1 is a plan view of the inner peripheral surface side of a conventional rubber crawler in which the left and right corners are arranged in a staggered pattern, and FIG. 2 shows only the core bar used in this rubber crawler. It is a side view. In the figure, reference numeral 1 is a cored bar, which is arranged side by side with respect to the longitudinal direction of the rubber crawler and embedded in the rubber 2. A pair of corners 3 and 4 are formed, which project from the inner peripheral surface of the rubber crawler. In addition, the space between the corners 3 and 4 of the core metal 1 serves as an engaging portion 5 with a sprocket (not shown).

Now, at the corners 3 and 4 of the core metal 1, the rolling wheels 10 roll on the top surfaces 6 and 7, but in this example, the corners 3 and 4 respectively. It swells in the opposite direction from the width of the core metal 1 in a zigzag manner, and tries to roll the rolling wheels 10 without moving them up and down as much as possible. However,
The rolling wheels 10 rolling on the top surfaces 6 and 7 of the corner portions 3 and 4 are
When riding on the top surfaces 6 and 7 of the corners 3 and 4 (A) and when moving away from this (C), the core metal 1 receives a load and inclines in that direction, so that the rolling wheel 10 also has its position. Will be lowered. On the other hand, when the roller 10 is on the top surfaces 6 and 7 (B), the position of the roller 10 is the highest, and accordingly, the roller 10 moves up and down by d, causing vibrations in the machine body. It becomes.

Further, the roller 10 has the top surfaces 6 and 7 of the corner portions 3 and 4.
Since it rolls up, a contact sound between metals is always emitted, which causes discomfort to the operator and the like. In addition, the weight of the core bar becomes heavy, which is not preferable.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a structure of a rubber crawler which is improved with respect to vertical movement of a roller wheel, and a corner portion extending from a core bar projecting on an inner peripheral surface of the rubber crawler. The purpose is to make the vertical movement of the rolling wheel that rolls up relatively smooth, and in particular,
The aim is to make the vertical rolling position of the rolling wheels as uniform as possible.

That is, the gist of the present invention is to embed a cored bar in an endless rubber elastic body at a constant pitch so that the center of the cored bar serves as a sprocket engaging part and the cored bar is sandwiched between the engaging parts. The left and right corners that extend further are arranged in a zigzag pattern in the longitudinal direction of the endless rubber elastic body in a zigzag pattern, and as a whole project in two rows and project in the longitudinal direction of the endless rubber elastic body. -In La, the height of the top surface of the staggered tip of both corners arranged in a staggered manner is increased, and the rubber crawlers are characterized in that depressions are formed on the top surfaces of both corners. Preferably, in the recess,
It is a rubber crawler filled with a rubber elastic body having a height sufficient to contact a rolling wheel rolling on the top surface of a corner portion.

[0009]

According to the present invention, there is provided a corner portion which is distributed from the core metal embedded in the rubber elastic body to the left and right sides and is arranged.
When the rolling wheel rolls on the top surface of this corner, the height of the staggered tip of the corner where the vertical movement is the most intense is heightened,
On the other hand, a dent is formed in the approximate center of the corner where the position is highest, and further, when rolling the rolling wheels, the vertical movement of the rolling locus seen from the side surface is reduced. That is, when the rolling wheel rides on the staggered tip at the corner, the corner is inclined, but in order to relatively reduce the vertical movement of the rolling wheel due to this inclination, the height of the staggered tip of the corner is made smaller. It ’s a high price,
The track of the rolling wheels did not move up or down by that amount, and the core metal was made lighter by recessing the central area of the corner top surface. And, preferably, when the rolling wheel rolls in the recess, the rubber elastic body is filled with a height sufficient to contact the rolling wheel, and therefore, the contact time between metals is shortened and noise is reduced. The occurrence of is reduced.

FIG. 3 is a conceptual view showing the relationship between the core bar and the rolling wheels used in the rubber crawler of the present invention. The corners 12 and 13 of the core bar 11 are the same as in FIG. They are arranged in a staggered pattern before and after the core metal. The zigzag-shaped portions that bulge into the corners 12 and 13 have a high top height (h), and the corners 12 and 13 have depressions 15 and 16 at the portions corresponding to the engaging portions 14. Are formed and the corners are 12 ₁ , 12 ₂ ,
It is divided into 13 ₁ and 13 ₂ .

When the rolling wheel 10 rides on the corner 12 ₁ (a), the height of the top surface 12 ₁₀ of the corner 12 ₁ is higher than that of the top surface 12 ₂₀ (h). Only wheel 1
Zero does not have to go down. Also, when the rolling wheel 10 separates from the corner portion 13 ₂ (c), the rolling wheel 10 does not have to be lowered by the amount that the top surface 13 ₂₀ is taller than the top surface 13 ₁₀ (h). As described above, the width of vertical movement of the roller 10 is smaller than that of the conventional cored bar shown in FIG. 2, and the vibration is reduced accordingly.
When the roller 10 is located in the central area of the corners 12 and 13 (b), the rubber elastic body 1 filled in the depressions 15 and 16 is formed.
Since it rolls over Nos. 7 and 18, it also reduces noise.

[0012]

The present invention will now be described in more detail with reference to the drawings. FIG. 4 is a plan view of the inner peripheral surface side showing the first embodiment of the rubber crawler of the present invention. In addition, FIG. 5 shows AA of FIG.
It is sectional drawing which took out only the core metal in a line. In the figure, reference numeral 21 is a rubber elastic body forming a rubber crawler, which is continuous above and below the plane of the drawing. And core metal 22
Are arranged in the width direction with a constant pitch, and the rubber elastic body 2
It is buried in 1. The central portion 23 of the cored bar 22 is an engaging portion with a sprocket (not shown), and 24 is an engaging hole therefor. Both wing portions 25 and 26 of the cored bar 22 are embedded in the rubber elastic body 21, and the corners 27 and 28 are formed by the cored bar 22 so as to sandwich the sprocket engaging portion 23. 21 protruding from the inner peripheral surface of the rubber elastic body 21 and extending in the longitudinal direction of the rubber elastic body 21.
Are in a line.

The corner portions 27 and 28 are arranged in a staggered manner in the front-rear direction of the core metal 22 as shown in the drawing.
Recesses 29 and 30 are formed on the top surfaces of the corners 27 and 28,
Corners 27 ₁ , 27 ₂ , which are divided by the depressions 29, 30,
28 ₁ , 28 ₂ top surfaces 27 ₁₀ , 27 ₂₀ , 28 ₁₀ , 28
_The rolling wheels 40 provided on the aircraft roll on the ₂₀ . The top surfaces 27 ₁₀ of the corners 27 ₁ , 28 ₂ on the staggered tip side,
28 ₂₀ is more d than one of the top surfaces 27 ₂₀ and 28 _10.
Only _{one is} taller. This d ₁ is preferably the amount of inclination of the cored bar 22 when the rolling wheel 40 rolls on this top surface, and it depends on the size of the rubber crawler, the weight of the machine body, etc., but is about 0.5-3 mm. Is good.

FIG. 6 is a sectional view similar to FIG. 5 of the second embodiment of the rubber crawler of the present invention. In this example, the staggered tip-side top surfaces 27 ₁₀ and 28 ₂₀ and the other top surfaces 27 ₂₀ and 28 ₁₀ form an inclined surface in a middle-folded shape,
As in the previous example, the difference d ₂ in height between the tips of the top surfaces 27 ₁₀ and 28 ₂₀ and the other top surfaces should be close to the amount of inclination of the cored bar 22 as described above.

FIG. 7 is a sectional view similar to FIG. 5 in the third embodiment of the rubber crawler of the present invention. In this example, the top surfaces 27 ₁₀ and 28 ₂₀ are each an inclined surface and a flat surface, and the difference between the top surfaces 27 ₁₀ and 28 ₂₀ and the top surfaces 27 ₂₀ and 28 ₁₀ is d ₃ . Incidentally, the top surfaces 27 ₁₀ and 28 ₂₀ may be those in which the flat surface is located inside and the inclined surface is located outside, contrary to the illustrated example. In addition, the top surfaces 27 ₁₀ and 28 ₂₀ may be composed of three flat surfaces, an inclined surface and a flat surface.

In the above examples, the depressions 29, 30
Is formed in the center of the core metal 22 in the front-rear direction at the left and right corners, but the present invention is not limited to this.

FIG. 8 is a sectional view similar to FIG. 5 in the fourth embodiment of the rubber crawler of the present invention. In the illustrated example, the depressions 29 and 30 are staggered from the center of the cored bar 22, respectively. It is an example of being formed on one side toward the tip end side of.

FIG. 9 is a plan view on the inner peripheral surface side of the fifth embodiment of the rubber crawler of the present invention. The difference from FIG. 4 is an example in which the rubber elastic bodies 31 and 32 are filled in the depressions 29 and 30.

FIG. 10 is a sectional view of the cored bar 22 and the rubber elastic bodies 31 and 32 taken along the line BB in FIG. In this example, the corners 27 ₁ and 27 ₂ have the same shape as in FIG.
The recesses 29, 30 are filled with rubber elastic bodies 31, 32. The top surface of such rubber elastic body 31 and 32 is an intermediate of the stature of the top surface of the corner portion 27 _1, 27 _2, corner portions 27 ₁
The small grooves 33, 34 are formed between the top surface 27 _{10 of each of the two and} the top surface 27 ₂₀ of the corner portion 27 ₂ to improve the durability of the rubber elastic bodies 31, 32.

FIG. 11 is a sectional view similar to FIG. 5 in the sixth embodiment of the rubber crawler of the present invention, in which the rubber elastic bodies 31, 32 are the top faces 27 ₁₀ , 27 of the corners 27 ₁ , 27 ₂ . 27 ₂₀
The step difference between and is an inclined surface.

FIG. 12 is a sectional view similar to FIG. 5 of the seventh embodiment of the rubber crawler of the present invention, showing a corner portion 27.
Rubber elastic body 3 more than the top surfaces 27 ₁₀ and 27 _{20 of 1} , 27 ₂
1 and 32 are further projected, and this projection amount d ₀
Can be calculated from the load acting on the rolling wheels 40 and the spring constant of the rubber elastic bodies 31 and 32, and the protrusion amount d ₀ is about 2.5 mm at maximum.

[0022]

Industrial Applicability The present invention is a rubber cloth having the above structure.
A structure in which the vertical movement of the rolling wheels is reduced by improving the top surface of the corners where the rolling wheels roll, and noise is reduced by interposing a rubber elastic body. Is.

[Brief description of drawings]

FIG. 1 is a plan view of an inner peripheral surface side of a conventional rubber crawler.

FIG. 2 is a side view showing only the cored bar in FIG.

FIG. 3 is a conceptual diagram showing a relationship between a cored bar and a rolling wheel used in the present invention.

FIG. 4 is a plan view of the inner peripheral surface side showing the first embodiment of the present invention.

5 is a cross-sectional view showing only the cored bar taken along the line AA in FIG.

FIG. 6 is a sectional view similar to FIG. 5, showing a second embodiment of the present invention.

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

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

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

10 is a cross-sectional view of the cored bar and the rubber elastic body taken along the line BB of FIG.

FIG. 11 is a sectional view similar to FIG. 5, showing a sixth embodiment of the present invention.

FIG. 12 is a sectional view similar to FIG. 5, showing a seventh embodiment of the present invention.

[Explanation of symbols]

21 ... Rubber elastic body, 22 ... Mandrel, 23 ... Sprocket engaging part, 24 ... Sprocket engaging hole, 25, 26 ... Both wings of the mandrel, 27, 28 ... Corner part, 27 ₁ , 27 ₂ , 28 ₁ , 28 ₂ ... Divided corners, 27 ₁₀ , 27 ₂₀ , 28 ₁₀ , 28 ₂₀ ... Top surfaces of the divided corners, 29, 30 ... Recesses, 31, 32.・ ・ ・ Rubber elastic body in the recess, 33, 34 ・ ・ ・ Groove between corner and rubber elastic body, 40 ・ ・ ・ Roller.

Claims (2)

[Claims] 1. A metal core is embedded in an endless rubber elastic body with a certain pitch, and a center of the metal core is used as a sprocket engaging portion, and left and right corners extending from the metal core sandwiching the engaging portion. Are arranged in a zigzag pattern in the longitudinal direction of the endless rubber elastic body in a zigzag pattern, and as a whole, the rubber claws are formed so as to form two rows in the longitudinal direction of the endless rubber elastic body.
In La, the structure of the rubber crawler is characterized in that the top surface of the staggered tips of the both corners arranged in a staggered manner is made taller and the depressions are formed on the top surfaces of the both corners. 2. The structure of the rubber crawler according to claim 1, wherein the recess is filled with a rubber elastic body having a height sufficient to contact a rolling wheel rolling on a top surface of a corner portion.