JPH0853079A - Structure of rubber crawler - Google Patents

Abstract

PURPOSE:To prevent the slip-off of a core metal and reduce weight by constituting the outer periphery faced in the width direction of the endless rubber elastic body of a core metal from a sheet metal and forming the inside vacant, and embedding a spread body row in a penetration state at the vacant part position. CONSTITUTION:Core metals 3 are embedded in a certain interval in a rubber elastic body 1, and as for the core metal 3, the outer periphery faced in the width direction of an endless rubber elastic body is constituted of a sheet metal, and the left and right blade parts 4 and a pair of angular parts 5, etc., which project from the inner periphery of the rubber elastic body 1 are formed to each vacant trunk part 6 toward the longitudinal direction of the rubber elastic body 1. Steel cord rows 21 and 22 are allowed to penetrate through the upper and lower sheet metals which constitute the left and right blade parts 4. In this state, the rubber elastic body 1 surrounds the core metal 3 and the steel cord rows 21 and 22, and further, intrudes into the vacant trunk part 6 of the core metal 3. Since the steel cord rows 21 and 22 penetrate through the indide of the vacant trunk part 6 of the core metal 3, the slip-off of the core metal 3 is suppressed, and the reduction of the wright of the rubber crawler is achieved by the weight reduction portion of the core metal 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler, and more particularly to a structure of a rubber crawler which prevents a core metal from falling off from a rubber elastic body.

[0002]

2. Description of the Related Art In recent years, rubber crawlers have been widely used as running parts of construction machinery and civil engineering work machines such as agricultural machinery, instead of iron crawlers. In such a rubber crawler, a large number of cored bars are embedded in an endless rubber elastic body at regular intervals, and a steel cord row as a tensile body surrounding the cored bar from the outside is also embedded. Since the rubber crawler is thus entirely made of a rubber elastic body, unlike the iron shoe crawler, cracks may occur in the rubber elastic body due to sharp ores scattered on the running surface, and moisture from the cracks. The core metal or steel coil
Rust may occur in the row.

[0003]

For this reason, the rubber black
In the case of a rubber core, the core bar may fall out of the rubber elastic body.If one core bar falls off, the life of the rubber crawler will end even if other parts can still withstand sufficient use. It will end up.

Particularly, in the so-called short pitch rubber crawler which has been adopted in recent years, there is a tendency that the area where the cored bar is embedded in the rubber elastic body, that is, the bonding area between the two is reduced. Therefore, due to the occurrence of cracks in the rubber elastic body, there is an increasing tendency that the core metal easily comes off from the rubber elastic body.

The present invention has been made in view of the above circumstances, and has a structure in which the core metal does not physically separate from the steel cord row even if the rubber elastic body is cracked. Is. Further, in the present invention, since the sheet metal or the cored bar made of synthetic resin is adopted, the overall weight of the rubber crawler can be reduced.

[0006]

The present invention has the following constitution in order to achieve the above object. That is, the first aspect of the present invention relates to a rubber crawler in which a large number of cored bars are embedded in an endless rubber elastic body at regular intervals, and a tensile body row is embedded in the longitudinal direction of the endless rubber elastic body. In the structure, the endless rubber elastic body of the core metal is made of a metal plate on the outer periphery facing in the width direction to form a hollow inside, and the rubber elastic body is penetrated through the tensile body row at this hollow portion. It is related to the structure of the rubber crawler embedded inside, and normally,
The sheet metal forming the core metal is formed by forming parallel planes with the tensile body rows sandwiched therebetween.

A second aspect of the invention is a rubber crawler in which a large number of cored bars are embedded in an endless rubber elastic body at regular intervals and a tensile body row is embedded in the longitudinal direction of the endless rubber elastic body. The core metal is made of synthetic resin, and a cavity is formed in the longitudinal direction of the endless rubber elastic body, and the hollow elastic body is penetrated through the tensile body row in the rubber elastic body. It relates to the structure of a rubber crawler, which is characterized in that

[0008]

The present invention adopts the above-mentioned structure, and even if a large external force is applied to the cored bar or the adhesive force between the cored bar and the rubber elastic body is reduced, the cored bar physically acts as a tensile member. The core bar is prevented from falling out of the row, and the core bar is prevented from falling off. As a result, the life of the rubber crawler is extended, and proper repair is possible. Further, the rubber elastic body surrounds the circumference of the tensile body row together with the core metal, and the rubber elastic body is also filled in the cavity of the core metal together with this, in other words, a part of the core metal is made of rubber. The elastic body is replaced, and the overall weight of the rubber crawler can be reduced.

The tensile body row is preferably embedded in the rubber elastic body in a state of penetrating through parallel portions formed of sheet metal or synthetic resin, which prevents movement of the tensile body row. Thus, the driving force from the sprocket is reliably transmitted to the cored bar. As the steel cord row which becomes such a tensile body row, one which is usually formed into a belt by pressing unvulcanized rubber sheets from above and below is used. The synthetic resin used for the core metal in the second invention is not particularly limited, but a synthetic resin having a property called so-called engineering plastic is preferably used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a sectional view of a first embodiment of a rubber crawler of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. In the figure, reference numeral 1 denotes a rubber elastic body, which is an endless continuous rubber claw on the front and back of the paper. Reference numeral 2 is a steel cord row as a tensile body row, and the steel cord row 2 is embedded in the lengthwise direction of the endless rubber elastic body 1. Further, cored bars 3 are embedded in the rubber elastic body 1 at regular intervals. The cored bar 3 has an outer circumference facing the width direction of the endless rubber elastic body made of sheet metal, and has a pair of corners 5 projecting from the left and right wings 4 and the inner circumference of the rubber elastic body 1. Etc. are all cavities 6 in the longitudinal direction of the rubber elastic body 1.

Then, the steel code rows 2 ₁ , 2 ₂ are distributed between the upper and lower substantially parallel sheet metals forming the left and right blade portions 4 so as to pass through them, and in this state, the rubber elastic body 1 Surrounds the core metal 3 and the steel cords 2 ₁ , 2 ₂ , and further enters the hollow portion 6 of the core metal 3. In the figure, 7 is a rubber lug, and the central portion 8 of the core metal 3 serves as an engaging portion with a sprocket (not shown). A separate member may be fitted into the central portion 8 for reinforcement.

As can be seen from the drawings, since the steel cord rows 7 and 8 penetrate into the hollow portion 6 of the cored bar 3, the cored bar 3 is prevented from falling off. Of course, the weight of the rubber crawler is reduced by the weight of the core metal 3. It is desirable that the upper and lower intervals of the blade portion 4 be 2 to 4 times the diameter of the steel cord penetrating therethrough.

FIG. 3 is a sectional view of a second embodiment of the rubber crawler of the first invention. The cored bar 11 has a wing portion 12 and a pair of corner portions 13 embedded in the rubber elastic body 1,
It is a core metal used in a friction drive type rubber crawler. In this case, the steel cord row 14 is penetrated into the hollow portion 15 of the cored bar 11 in a region parallel to the central metal plate and is embedded in the rubber elastic body. In the figure, the corner portion 13 of the core metal 11
Is the engaging portion with the sprocket, but it goes without saying that one corner may be formed and used for engaging with the sprocket.

FIG. 4 is a perspective view of a cored bar 21 used in a third embodiment of the rubber crawler of the first invention. In this example, there is a sheet metal that determines the outer shape of the cored bar 21, and the cored bar 21 is configured in a state where a part thereof is opened 22. In the illustrated example, one end of the wing portion 23 is the open portion 22. As described above, the open portion 22 is formed in a portion of the core metal where stress is not applied so much.
More steel cord rows can be easily inserted into the cavity 24.

5 to 7 are front views of a synthetic resin cored bar 31 used in the first to third embodiments of the rubber crawler of the second invention. In FIG. 5, the synthetic resin used is nylon resin, and flat holes (cavity portions) 34 through which the steel cord rows 33 pass are formed in the wing portion 32 on the left and right. Figure 6
The wing portion 32, the corner portion 35, and the central portion 36 are provided with a cavity portion 34 which is continuous, and the steel cord row 33 penetrates the wing portion 32. Further, FIG. 7 shows an example of a cored bar used in a friction driven rubber crawler, in which a hollow part 34 is provided in a central part 36 of the cored bar to penetrate a steel code row 33. In the example, the cavity portion 34 ₀ is also formed in the corner portion 35.

All of these are embedded in a rubber elastic body to form a rubber crawler, and the rubber elastic body surrounds the core metal and the steel code, and further fills the inside of the cavity. Becomes

[0017]

Since the present invention is the rubber crawler having the above-mentioned structure, since the core bar and the steel cord row are physically engaged with each other, the core bar may be removed. It has the effect of disappearing. Therefore, the rubber on the inner peripheral side of the core metal can be thinned, and the distance between the inner peripheral surface of the rubber and the row of steel cords can be reduced. This is
It is possible to reduce the distance between the corners of the adjacent cores, and the characteristic is that the occurrence of vibration is reduced accordingly. Further, since the core metal is made of sheet metal or synthetic resin to form the cavity, weight reduction can be achieved as a whole of the rubber crawler, and there is a merit in cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of a rubber crawler according to the first invention.

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

FIG. 3 is a sectional view of a second embodiment of the rubber crawler according to the first invention.

FIG. 4 is a perspective view of a core bar of a third embodiment of the rubber crawler according to the first invention.

FIG. 5 is a perspective view of a core bar of a rubber crawler according to the present invention.

FIG. 6 is a perspective view of a cored bar which is another example of the rubber crawler according to the present invention.

FIG. 7 is a perspective view of a cored bar which is still another example of the rubber crawler according to the present invention.

[Explanation of symbols]

1 ... Rubber elastic body, 2, 2 ₁ , 2 ₂ , 14, 33 ... Steel code row, 3, 11, 21, 31 ... Core metal, 4, 12, 23, 32 ... Wing portion , 5, 13, 35, ... corners, 6, 15, 24, 34, ... cavity, 22 ... open parts.

Claims (3)

[Claims] 1. A structure of a rubber crawler in which a large number of cored bars are embedded at regular intervals in an endless rubber elastic body, and a tensile body row is embedded in the longitudinal direction of the endless rubber elastic body. An outer periphery of the core metal facing the width direction of the endless rubber elastic body is formed of a sheet metal to form a hollow inside, and the hollow body is embedded in the rubber elastic body while penetrating the tensile body row. The structure of the rubber crawler characterized by the fact. 2. The structure of the rubber crawler according to claim 1, wherein the sheet metal forming the core bar sandwiches the tensile body rows to form parallel surfaces. 3. A structure of a rubber crawler in which a large number of metal cores are embedded in an endless rubber elastic body at regular intervals, and a tensile body row is embedded in the longitudinal direction of the endless rubber elastic body. The core metal is made of synthetic resin, and a cavity is formed in the longitudinal direction of the endless rubber elastic body, and the core metal is embedded in the rubber elastic body while penetrating the tensile body row. The structure of the rubber crawlers.