JP2006069295A - Endless structure of rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber crawler having excellent durability by eliminating any separation phenomenon of an adhesive boundary exposed part A in a rubber lug forming a contact surface of rubbers in an endless structure. <P>SOLUTION: In an endless structure of the rubber crawler, the rubber crawler comprises a long rubber elastic band 1 with ends, steel cords 2 embedded in the longitudinal direction of the rubber elastic band, and rubber lugs 4, 4a, the steel cords protruded from both ends of the rubber elastic band 1 overlap each other, and both ends 1a, 1b of the long rubber elastic band 1 with ends are integrally vulcanization-molded. An adhesive boundary exposed part A in the rubber lug forming a contact surface of rubbers during the integrated vulcanization-molding is formed on an inclined side face of the rubber lugs. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rubber track, and more particularly to a novel rubber track endless structure.

  In recent years, rubber crawlers have been widely adopted not only for agricultural equipment but also for construction machinery and civil engineering machinery. The reduction of vibrations to the operator is not only reduced, but the road surface is not roughened compared to iron shoes. There is a big feature.

  In this type of rubber crawler, normally, an endless long rubber elastic band is first vulcanized and then both ends are bonded to form an endless structure. FIG. 1A is a side sectional view showing a first example, where 1 is a long elastic rubber band with ends, 2 is a steel cord embedded in the longitudinal direction, and 3 is a constant pitch. The cored bar 4 is a rubber lug. Then, the steel cords 2 projecting from both ends of the endless long rubber elastic band 1 are overlapped, and both ends 1a and 1b of the endless long rubber elastic band 1 are set in an un (half) vulcanized state. It is made endless by vulcanizing it. As shown in the drawing, the tips 2a and 2b of the steel cord 2 are overlapped at the portion, and the tip 2a side is the outer peripheral side, and the tip 2a is usually arranged directly below the rubber lug 4a. . Needless to say, this method is also applied to a rubber crawler in which the core metal 3 is not embedded.

  FIG. 1B is a side sectional view showing a second example 2 applied to a coreless rubber crawler, and a steel cord 2 protruding from both ends 1a and 1b of a long elastic rubber band 1 with ends. Are stacked in a mold (not shown), and a new unvulcanized rubber 5 is filled in this space in the mold, and this is vulcanized to make it endless.

  However, it is clear that the adhesion boundary exposed portion A between the rubbers is inferior in adhesive strength to the other integrally vulcanized portions, and therefore, the adhesion boundary exposed portion A is usually stress generated when the rubber crawler is used. A low location is selected. However, the central portion of the rubber lug 4 is a place where the distortion at the time of bending is relatively small, and it is general that the endless structure is completed by bringing the exposed boundary A between the rubbers.

  However, when the rubber crawler is used, the top of the rubber lug 4 is in contact with the road surface, and distortion such as twisting and twisting is necessarily added. A phenomenon that the portion A peeled occurred. In some cases, the peeling progresses and reaches the steel cord 2 embedded therein, and moisture and earth and sand enter from here. In particular, the moisture reaches the full length of the steel cord 2 and the steel cord. There was also a case that caused corrosion of the lead and led to cutting.

  The present invention has been made in view of the conventional technology as described above, and eliminates the phenomenon that the adhesion boundary exposed portion A between the rubbers at the top of the rubber lug is removed, thereby providing a rubber crawler excellent in durability. It is the purpose.

  The gist of the present invention is that a long elastic rubber band with ends, a steel cord embedded in the long direction of the rubber elastic band and projecting from the both ends thereof, and a rubber lug formed on the outer peripheral side, A rubber crawler endless structure in which steel cords protruding from both ends of the rubber elastic band 1 are overlapped, and both ends 1a and 1b of the long elastic rubber band 1 are integrally vulcanized and molded. In addition, the adhesive boundary exposed portion A in the rubber lug which is a contact surface between the rubbers in the integral vulcanization molding is formed on the inclined side surface of the rubber lug.

  The present invention is as described above. By forming the adhesion boundary exposed portion A in the rubber lug, which is a contact surface between the rubbers when the endless structure is formed, on the inclined side surface of the rubber lug, distortion during running of the rubber crawler is achieved. It is no longer greatly affected by this, and greatly contributes to the improvement of the life of the rubber track.

  The slanted side surface of the rubber lug is a relatively small strain compared to the strain applied to the top surface and the base of the rubber lug or the flat portion between the rubber lugs due to the contact and push-up of foreign matter from the road surface during traveling. By arranging the adhesion boundary exposed part A between each other, the peeling phenomenon was reduced and the life of the rubber crawler was extended.

  That is, at the time of the integral vulcanization molding of the rubber crawler, the adhesion boundary surface between the rubbers is made a curve, a hook-shaped line, and a diagonal line, thereby removing the adhesion boundary exposed part A between the rubbers from the top of the rubber lug It avoids the base part of the rubber rug with large distortion and the flat part between the rubber lugs, and sets this on the inclined side surface of the rubber lug.

  For example, the exposed boundary A between the rubbers during the integral vulcanization molding of the rubber crawler may be the ends of a long elastic rubber band with ends as shown in FIG. 2, or FIG. As shown, it may be a boundary portion with the newly filled rubber.

  In the case of integral vulcanization molding of the rubber crawler, it is further preferable to increase the strength by applying an adhesive to the rubber surface on the vulcanized side.

Hereinafter, the present invention will be described in more detail with reference to the drawings.
FIG. 2 is a side sectional view of the rubber track of the present invention having an endless structure according to the method shown in FIG. The vulcanized rubber portion constitutes a top portion of the rubber lug 4a and is cut 1c from the outer end at a position lower than the top portion. On the other hand, the un (semi) vulcanized rubber portion of the tip 1b has a shape in which the tip is fitted into the cut 1c described above. It is what.

  In addition to the shape shown in this example, the shape shown in FIGS. 4 to 6 can be adopted as the shape of the cut portion 1c. Also, as shown in FIG. 7 or FIG. Needless to say, the rubber lug is made of vulcanized rubber, and the exposed boundary A between the rubbers when vulcanized can appear on the inclined side surface of the rubber lug.

  According to this molding method, the adhesion boundary exposed portion A between the rubber lugs 4a corresponding to the tip 1a of the rubber elastic band 1 appears on the inclined side surface of the rubber lug 4a. For this reason, the life of the rubber crawler is greatly improved as compared with the conventional endless structure formed on the top surface of the rubber lug.

  FIG. 3 is a side sectional view of the rubber crawler of the present invention which has been made endless by the method of FIG. 1 (B). The cavity 1c is cut at a lower height and vulcanized and molded, and a cavity for forming a rubber lug in a mold (not shown) at the time of endless molding has a space on the top side of the rubber lug. Accordingly, new unvulcanized rubber 5 is filled in the mold, and the unvulcanized rubber 5 is filled up to the top of the rubber lug, and then vulcanized and molded by pressurizing and heating to make endless.

  According to this molding method, the adhesion boundary exposed portion A between the rubbers in the rubber lugs 4a and 4b when filled with the both ends 1a and 1b of the rubber elastic band 1 and the new unvulcanized rubber 5 and vulcanized is the rubber lug 4a, Appears on the inclined side surface of 4b. For this reason, the life of the rubber crawler is greatly improved as compared with the conventional endless structure formed on the top surface of the rubber lug.

  4 to 6 show a modification of the cut portion 1c of the rubber lugs 4a and 4b in FIG. 3, and the ends 1a and 1b of the rubber elastic band 1 are curved without being horizontal as described above (see FIG. 4) It can be tilted (FIG. 5), or can be changed into a waveform (FIG. 6), and the change is free. In any case, the adhesion boundary exposed portion A between the rubbers when vulcanized appears on the inclined side surfaces of the rubber lugs 4a and 4b.

  FIG. 7 and FIG. 8 show a further modified example, and the second unvulcanized rubber 6 can be filled and vulcanized.

  The present invention is an improvement of the adhesion boundary exposed portion A between rubbers when making the rubber crawler endless regardless of whether or not the core metal is buried, and when the rubber crawler is used, This has been brought to the inclined side surface of the rubber lug, which is thought to be small in generation, and this has reduced the peeling of the rubber from this portion and greatly extended the life of the rubber crawler. Such an endless structure can be implemented regardless of whether or not a core metal is embedded in the rubber track, and its industrial contribution is great.

FIG. 1 is a side sectional view showing a conventional endless structure. FIG. 2 is a side sectional view showing the endless structure of the present invention according to the method of FIG. FIG. 3 is a side sectional view showing the endless structure of the present invention according to the method of FIG. FIG. 4 is a side cross-sectional view showing a modification 1 of the endless structure of FIG. FIG. 5 is a side sectional view showing a second modification of the endless structure of FIG. 6 is a side sectional view showing a third modification of the endless structure of FIG. FIG. 7 is a side sectional view showing a modification 4 of the endless structure of FIG. FIG. 8 is a side sectional view showing a fifth modified example of the endless structure of FIG.

Explanation of symbols

1. Ended long elastic elastic band,
1a, 1b ... both ends of a long rubber elastic band,
1c: Cut portions at both ends of the long rubber elastic band,
2 Steel code,
3. Core metal,
4, 4a, 4b, rubber lugs,
5, 6 ... unvulcanized rubber,
A ... The exposed part of the adhesion boundary between rubbers.

Claims (1)

  It is composed of a long rubber elastic band with ends, a steel cord embedded in the long direction of the rubber elastic band and protruding from both ends thereof, and a rubber lug formed on the outer peripheral side. An endless structure of a rubber crawler in which steel cords protruding from both ends of the belt 1 are overlapped, and both ends 1a and 1b of a long elastic rubber band 1 are integrally vulcanized and molded. An endless structure of a rubber crawler, wherein an adhesion boundary exposed portion A in a rubber lug, which is a contact surface between rubbers at the time of molding, is formed on an inclined side surface of the rubber lug.

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