JP3917270B2 - Structure of rubber track - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a rubber crawler, and particularly relates to an improvement of a rubber crawler used for wetland travel.
[0002]
[Prior art]
There is a so-called dish-type rubber crawler as a rubber crawler for running in wetlands. This is because the width edge (ear part) of the rubber crawler is deflected to the inner peripheral side of the rubber crawler and is named because it has a dish-like shape when viewed in cross section. It is. FIG. 9 is a cross-sectional view in the width direction showing a typical shape of the dish-type rubber crawler. A cored bar 22 is embedded side by side with a constant pitch in the longitudinal direction of the rubber crawler 21, and further this core. A steel cord 24 is embedded in rubber in a row to surround the wing 23 of the gold 22. The rubber crawler 21 is an example in which the left and right shapes in the width direction are asymmetric.
[0003]
The bent portion 26 is formed so that the ear portion 25 of the rubber crawler 21 is positioned in the inner circumferential direction with respect to the center portion. For this reason, the lug 27 formed on the outer peripheral surface of the rubber crawler 21 is formed. The part corresponding to the ear | edge part 25 will be formed taller than the center. For this reason, it is set as the shape which brings buoyancy to the rubber crawler 21 and is useful also for transmission of a propulsion force.
[0004]
However, it is also true that the ear portion 25 of the rubber crawler 21 tends to bend toward the inner periphery during traveling because of the bending portion 26, and thus there is a case where desired buoyancy is not generated. And if the ear | edge part 25 of the rubber crawler 21 bends too much at the time of turning of a body, turning resistance will become quite large. Further, Gomukuro - be in a running of La 21, results bent ears 25 are repeated, Gomukuro at tip 23 ₀ of the blade portion 23 of the core bar 22 - cracks were also there to enter the LA.
[0005]
[Problems to be solved by the invention]
The present invention has been made to solve the above problems, and the gist of the present invention is that a core metal arranged side by side with a constant pitch in the longitudinal direction of the endless rubber member elastic body is embedded, and the blade of this core metal The rubber crawler structure has a steel cord that embeds the outer wall at the same time and a rubber lug is formed on the outer surface side, and the width edge of the endless rubber elastic body is inside the central area of the inner surface of the rubber crawler. It is located on the circumferential side via a bending part, and the tip part of the left and right wing parts of the core metal embedded in the rubber is bent to the inner circumferential side of the rubber crawler corresponding to the inflection part , and The tip of the cored bar is disposed inside the bent part , preferably the rubber lug and the cored bar are arranged at a position where they overlap on a plane, more preferably this bent The front and back penetration part is formed in the part.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the conventional rubber crawler, as described above, the ear part of the rubber crawler is insufficient in rigidity, so that the ear part is curved toward the inner periphery during running. The pressure that supports the airframe is applied only to the central area of the rubber crawler, and the entire airframe has the disadvantage of sinking into the swamp.
In addition, since the ear portion is curved during running, bending stress is concentrated on the rubber at the tip of the wing portion of the core metal, and there is a drawback that the ear is easily cut off.
[0007]
The purpose of the present invention is to improve a so-called dish-type rubber crawler. In a normal dish-type rubber crawler, the wing part of the core metal embedded in the rubber has a length that does not reach the bending part. However, in the rubber crawler of the present invention, both ends of the wing portion of the core metal reach this bending portion, and the tip is bent to the inner peripheral side of the rubber crawler. Is. And, the inclination angle of the bent part of the dish-type rubber crawler is usually about 10 to 30 degrees, but the bent shape is substantially equal to the inclination angle of the bent part, The bending phenomenon to the inner peripheral side of the ear part of the rubber crawler during running is suppressed, and the contact pressure is hardly reduced, which contributes to the increase in buoyancy.
[0008]
This is because the rigidity of the ear part of the rubber crawler is improved even during turning, and the resistance during turning is reduced along with the reduction of the side resistance due to the bending part. Characteristically, only the rubber crawler has a short ear, and both ends of the metal core are bent to the inner peripheral side of the rubber crawler. Although the interval becomes large, this means that the rubber thickness between the ground contact surface and the end of the cored bar is increased, and this has a great feature that the occurrence of the ear breakage is also reduced. And the turning performance of the rubber crawler is also improved.
[0009]
In addition, if a hole-like or dent-like front and back penetrating part is formed in the bent part, the rubber member that is vulcanized and bonded to both sides is united through the penetrating part to prevent further peeling. As a result, the weight of the core bar becomes lighter, which helps to reduce the weight.
[0010]
【Example】
Hereinafter, embodiments of the rubber track of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a plan view of a core bar used in the rubber track of the present invention, FIG. 2 is a front view, and FIG. 3 is a cross-sectional view taken along line AA.
[0011]
The cored bar 10 in the figure comprises left and right wing parts 11, 11, a pair of protrusions 12, 12 protruding from the inner peripheral surface of the rubber crawler, and a sprocket engaging part 13 sandwiched between the protrusions 12, 12. In particular, the tip portions of the wing portions 11 and 11 are bent portions 14 and 14 that are bent toward the inner peripheral side of the rubber track. The bent portions 14 and 14 correspond to the bent portions that form the ear portions of the rubber track.
[0012]
Now, the rubber crawler of the present invention is such that the above-described core bars are arranged side by side with a constant pitch in the longitudinal direction and embedded in the rubber. FIG. 4 is a plan view of the inner side of the rubber crawler 1 and FIG. 5 is a plan view on the outer peripheral side, FIG. 6 is a side view, FIG. 7 is a cross-sectional view taken along line BB, and FIG. 8 is a cross-sectional view taken along line CC.
[0013]
In the figure, reference numeral 1 is a rubber crawler, and 2 is a steel cord that surrounds the wing part 11 of the core metal 10 and is embedded in the rubber. The rubber lugs 3 and 4 provided on the outer peripheral surface of the rubber crawler are formed so as to overlap with the embedded portion of the core metal 10. In this example, the large lug reaching the width edge of the rubber crawler 1. 3 and the small lugs 4 existing only in the central portion are alternately arranged, and the central portion 5 of the large lug 3 is cut out. The ear portion 6 of the rubber crawler 1 is formed on the inner peripheral side with respect to the central region of the rubber crawler 1, and the bent portion 7 connects these portions. That is, the ear portion 6 is disposed on the inner peripheral side of the rubber crawler by the bending portion 7 as shown in the drawing, and has a dish-shaped cross section.
[0014]
As can be seen in this figure, the bent portion 14 at the tip of the cored bar 10 does not stay at the center of the rubber crawler but reaches the bent part 7. The bending angle of the bent portion 14 is approximately approximate to the angle of the bent portion 7.
[0015]
Accordingly, the rigidity of the bent portion 7 of the rubber crawler is remarkably improved, and the distance between the ground contact surface of the rubber lug 4 and the tip of the bent portion 14 of the core metal 10 is considerably different from that of the conventional rubber crawler. For this reason, the bending phenomenon to the inner peripheral side of the ear | edge part 6 is blocked | prevented, and generation | occurrence | production of an ear | edge piece is also reduced. For this reason, the turning performance of the rubber track is also improved.
[0016]
In the figure, reference numerals 14 ₀ and 14 ₁ denote through-holes penetrating the front and back surfaces of the bent portion 14, respectively. The through-hole 14 ₀ is a hole-like one, and the through-hole 14 ₁ is a concave shape. Is. As can be seen in the example of the drawing, it is clear that the rubber members on the front and back of the bent portion 14 are integrated by providing the bent portions 14 with the through portions 14 ₀ , 14 ₁ , which is useful for preventing peeling, for example. .
[0017]
The core bar used in the rubber track of the present invention may be further described. Depending on the structure of the rubber track, a bent part may be formed only on one side of the wing part, and the rigidity of the ear part may be provided. In order to further impart the above, it is possible to make the bent portion have a wide structure. On the other hand, when viewed from the rubber crawler side, the rubber lug provided on the outer peripheral surface may include only a long lug.
[0018]
【The invention's effect】
Since the present invention adopts the above configuration, the rigidity of the ear part of the dish-shaped rubber crawler can be increased, and the turning performance is improved because the ear part is less likely to bend to the inner peripheral side as well as the driving force. In addition, an excellent rubber crawler with less ear-cuts can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of a core bar used in a rubber track of the present invention.
FIG. 2 is a front view of the cored bar of FIG. 1;
3 is a cross-sectional view taken along line AA of the cored bar of FIG. 1. FIG.
FIG. 4 is a plan view of the inner periphery side of the rubber track of the present invention.
5 is a plan view of the outer peripheral side of the rubber track of FIG. 4. FIG.
6 is a side view of the rubber track of FIG. 4. FIG.
7 is a cross-sectional view of the rubber track of FIG. 4 taken along line BB.
8 is a cross-sectional view of the rubber track of FIG. 4 taken along line CC.
FIG. 9 is a cross-sectional view of a conventional dish-shaped rubber track.
[Explanation of symbols]
1 ... Rubber Crawler,
2 ... Steel code,
3, 4 ... rubber lugs,
6 ...... Ear part,
7...
10 ... Core metal,
11 ... Wings of cored bar,
12 ... Core metal protrusion,
13 ... Sprocket engaging part of the cored bar,
14 ... the bent part at the tip of the core wing,
14 ₀ , 14 ₁ ... Penetrating part provided in the bent part.

Claims (3)

Endless rubber member Rubber in which core bars arranged side by side at a constant pitch in the longitudinal direction are embedded, steel cords surrounding the wings of the core bars are embedded at the same time, and rubber lugs are formed on the outer surface side Crawler structure ,
The width edge part of the endless rubber elastic body is located on the inner peripheral side of the inner peripheral surface central area of the rubber crawler via the bending part, and the distal ends of the left and right wing parts of the core metal embedded in the rubber A rubber crawler structure characterized in that it is shaped to be bent toward the inner peripheral side of the rubber crawler corresponding to the bent portion, and further, the tip end portion of the cored bar is arranged inside the bent portion . The rubber crawler structure according to claim 1, wherein the rubber lug and the cored bar are arranged at positions where they overlap each other on a plane. The rubber crawler structure according to claim 1, wherein front and back through portions are formed in the bent portion.

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