JPH04262981A - Core metal structure of rubber crawler - Google Patents

Abstract

PURPOSE:To prevent rubber from easily separation due to pinch in the traveling of a trunk roller by providing bulging parts provided on a pair of left and right projections as a trunk roller traveling surface of a core metal of a rubber crawler such that at least one side of the projection extends longer than the blade width along the longitudinal direction of the rubber crawler. CONSTITUTION:A core metal 1 of a rubber crawler having blades 11 is formed with a sprocket engaging portion 12 sandwiched by the blades 11. Also, a pair of projections 13, 14 are formed of the blades 11 sandwiching the engaging portion 12 and the traveling surface of a trunk roller is made of the top surfaces 15, 16 of the projections 13, 14. While the top surfaces 15, 16 are formed longer than the width of the blade 11 and staggered back and forth longitudinally of the rubber crawler, the projections 13, 14 are formed on one sides with bulging portions 17, 18 respectively. Also, the projections 13, 14 are respectively formed on the front and rear surfaces with grooves 19, 20. When a rubber elastic body provided a base body of the rubber crawler is vulcanized and molded, rubber 21 is adapted to flow integrally in the respective grooves 19, 20 and increase the adhesion area of the rubber 21.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a core metal structure for a rubber crawler, and mainly relates to a core metal structure for improving the durability of rubber crawlers used in the running parts of construction machines and civil engineering work machines. be.

0002

2. Description of the Related Art Conventionally, iron shoe crawlers have been used as running parts in construction machines and civil engineering machines, but in recent years, rubber crawlers have been used as running parts. This rubber crawler is made of a rubber elastic body in the form of an endless band, and a large number of core metals arranged horizontally in the width direction are embedded in the rubber, and these are connected with steel cord (tensile body). It has an enclosed structure, and since the crawler is made of rubber, it reduces the vibrations transmitted to the passengers, and it is also preferred because it does not damage the road surface even when driving on paved roads. It turned out that this was the case.

[0003] In these construction machines and civil engineering work machines,
In general, both iron shoe crawlers and rubber crawlers can be installed, and the rollers installed on the aircraft are mounted on the top surface of the protrusion extending from the core metal that protrudes toward the inner peripheral surface of the rubber crawler. is the running surface of the wheel. FIG. 1 is a plan view of a core metal 1 used in this kind of rubber crawler, and FIG.
is a side view of this core metal. This core bar 1 is made of rubber claw.
A large number of rubber elastic bodies are arranged at regular intervals in the band-shaped rubber elastic body constituting the rubber. In the figure, 2 and 3 are left and right wings embedded in the rubber elastic body (not shown) constituting the rubber crawler and extending in the width direction of the rubber crawler. A sprocket engaging portion 4 that receives force, and a pair of protrusions 5 and 6 sandwiching this engaging portion 4.
is formed. A rolling wheel 7 provided on the fuselage runs on the top surfaces of these protrusions 5 and 6.
In order to make the crawler run smoothly, the surfaces of the protrusions 5 and 6 are elongated in the longitudinal direction of the crawler.
, 3 are shifted back and forth in the opposite direction, and from another perspective, the bulges 8 and 9 are formed in opposite directions. FIG. 3 schematically shows the relationship between the core metal 1 and the rollers 7 in this rubber crawler from a side view.

0004

[Problems to be solved by the present invention] However, when the rolling wheel 7 rides on the top surface of the protrusions 5 and 6 in FIG. Rubber part 101 sandwiched between ring 7 and protrusions 5 and 6
, 102 have peeled off, and as a result, the rollers 7 and the protrusions 5
, 6, metal-to-metal collisions will be repeated. This generates noise and causes vibrations to the occupants. Moreover, the peeling of the rubber parts 101 and 102 becomes even more severe due to the intrusion of sand and the like between the core metals 5 and 6, and in extreme cases, the core metal parts 5 and 6 may even slip out from the rubber elastic body 10. there were.

[0005]

The present invention is intended to solve the above-mentioned problems, and as a result of intensive study, the object has been achieved by adopting the following configuration. That is, the gist of the present invention is that it consists of left and right wing parts embedded in a rubber elastic body, a sprocket engaging part in the center, and a pair of protrusions sandwiching this sprocket engaging part and forming the running surface of the wheel. The protrusion is longer than the width of the wing part, and has a bulge protruding from the wing part on at least one side in the longitudinal direction of the rubber crawler, and the protrusion is longer than the width of the wing part, and has a bulge part that protrudes from the wing part on at least one side in the longitudinal direction of the rubber crawler. A core metal structure for a rubber crawler, characterized in that a groove is formed in the core metal structure,
The groove is a core metal structure of a rubber crawler in which a groove is formed on the front or rear surface of a protrusion, or a groove is formed on the top surface of the protrusion in succession to the groove. In some cases, an auxiliary groove part connected to the groove part may be formed on the side surface of the protrusion.

[0006]

[Function] As mentioned above, the core metal structure for a rubber crawler of the present invention has a groove in the same direction as the running direction formed on the protrusion that becomes the running surface of the roller, and the rubber crawler is placed in this groove. Rubber claw is made by integrally vulcanizing and molding the rubber elastic body that serves as the base.
It is something that gives you a. In other words, grooves are formed between the rollers and the protrusions of the core metal at positions on the core metal where the rubber elastic body is most likely to peel off due to the prying phenomenon of the wheels when the wheels run, and grooves are also formed within these grooves. The rubber elastic body is integrally vulcanized and molded at the same time as the rubber crawler, and the adhesive area between the rubber and the core bar is large to prevent early peeling of the rubber.

[0007]

[Specific Examples] The structure of the core metal of the present invention will be explained in more detail below with reference to the drawings. FIG. 4 is a top view of a core metal A showing a first embodiment of the core metal of the present invention, and FIG. 5 is a sectional view taken along the line AA in FIG. 4. In the figure, reference numeral 11 denotes a wing portion, which is a portion embedded in a rubber elastic body (not shown) constituting the base of the rubber crawler. A sprocket engaging portion 12 is sandwiched between the wing portions 11, and is a portion that applies propulsive force to the rubber crawler by engaging with sprocket teeth (not shown). Then, sandwiching this engaging portion 12, the wing portion 11
A pair of protrusions 13 and 14 are formed. The top surfaces 15 and 16 of these protrusions 13 and 14 serve as running surfaces for rolling wheels (not shown), so the top surfaces 15 and 16 of these protrusions 13 and 14 are longer than the width of the wing portion 11 of the metal core. , and in this figure, they are formed so as to be shifted back and forth in the longitudinal direction of the rubber crawler, and each of the protrusions has bulges 17 and 18 only on one side. And these protrusions 13 and 14
, in the same direction as the running direction of the wheel, that is, the protrusions 13, 1
Grooves 19 and 20 are formed on the front and rear surfaces of 4. As shown by dotted lines, rubber 21 enters into the grooves 19 and 20 at the same time as the rubber elastic body constituting the base of the rubber crawler is vulcanized and molded together. .

That is, when the wheels are running, the protrusions 13,
14 is reduced, reducing noise generation, and at the same time, the collision between the rolling wheels and the rubber body is ensured, which leads to a reduction in vibration, and the contact area between the rubber and the core metal is expanded. As a result, early peeling of the rubber due to twisting of the wheels has been significantly reduced. In this example, grooves 19 and 20 were formed on the front and rear surfaces of the protrusions 13 and 14, but
Depending on the shape of the protrusion, a groove may be formed on one side.

FIG. 6 is a sectional view similar to FIG. 5 of a core metal B showing a second embodiment of the present invention, but in this example, the protrusion 1
This is an example in which grooves 22 are also formed on the top surfaces of wheels 3 and 14, and this groove 22 is continuous with the grooves 19 and 20, and since the rubber 21 is also present on the running surface of the wheels, noise is reduced. In addition, vibrations are reduced, and of course, the occurrence of peeling of the rubber 21 is extremely reduced.

FIG. 7 is an enlarged top view of a protrusion 13 of a core metal C showing a third embodiment of the present invention. In this example, the grooves 19, 20, 22 described above are formed in the protrusion 13 (14), and the protrusion 13 (14) is further formed in order to prevent the rubber 21 from peeling off.
) is also formed with an auxiliary groove 23 on the side surface thereof, and is connected to the groove part. Of course, the grooves and auxiliary grooves described so far may have one or more grooves, and in order to prevent the rubber 21 from peeling off, it is preferable that the cross-sectional shape of the grooves is wedge-shaped, expanding inward. good.

[0011]

[Effects] As described above, the present invention has been devised for the protrusion of the core metal that becomes the running surface of the roller, and when it is embedded in the rubber elastic body that constitutes the base of the rubber crawler. In some cases, the rubber enters the grooves formed in the protrusions and is integrally vulcanized, which eliminates early peeling of the rubber due to prying when the wheels run, and also serves as a vibration and noise countermeasure. It will be of great help.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a core metal of a conventional rubber crawler.

FIG. 2 is a side view of the core metal shown in FIG. 1.

FIG. 3 is a side view schematically showing the relationship between the core metal and the rolling wheels in FIG. 1.

FIG. 4 is a top view of a core bar showing a first embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along line A-A in FIG. 4.

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

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

[Explanation of symbols]

1, A, B, C... Core metal 2, 3, 11... Wing section 4, 12...Sprocket engagement part 5, 6, 13, 14...protrusions 7.Rolling wheels 8, 9, 17, 18...Bulging part 10‥‥Rubber elastic body 101, 102...Rubber part 15, 16...Top surface of protrusion 19, 20, 22...Groove 22.Rubber inside the groove 23‥‥Auxiliary groove

Claims (5)

[Claims] Claim 1: A core metal consisting of left and right wing parts embedded in a rubber elastic body, a central sprocket engaging part, and a pair of protrusions sandwiching the sprocket engaging part and forming the running surface of the wheel. The protrusion is longer than the width of the wing, and has a bulge protruding from the wing on at least one side in the longitudinal direction of the rubber crawler, and the protrusion has a groove in the running direction of the roller. Rubber claw characterized by the formation of
Core structure for la. 2. The core structure of a rubber crawler according to claim 1, wherein a groove is formed on the front or rear surface of the protrusion. 3. The core metal structure for a rubber crawler according to claim 1, wherein a groove is formed on the front or rear surface of the protrusion, and further a groove is formed on the top surface of the protrusion continuous with the groove. 4. The core metal structure for a rubber crawler according to claim 1, wherein an auxiliary groove portion continuous with the groove portion is formed on a side surface of the protrusion. 5. The core metal structure for a rubber crawler according to claim 1, wherein the groove is formed continuously on a side surface and a top surface of the projection.