JP4782464B2 - Endless structure of rubber track - Google Patents

Description

  The present invention relates to an improvement in the endless structure of a rubber track.

  As an endless structure of a rubber crawler, generally, a long and end rubber crawler base is vulcanized and bonded at both ends to form an endless structure. At that time, a steel cord embedded in the rubber track substrate is protruded from both ends thereof, and vulcanized and bonded in a state of being overlapped to form an endless rubber track.

  FIG. 1 is a view showing an example thereof. Reference numeral 1 denotes a rubber track substrate, and a steel cord 2 is embedded in the longitudinal direction thereof. Then, both ends 2a and 2b of the steel cord 2 projecting from both ends of the rubber track substrate 1 are overlapped and vulcanized. At this time, the rubber of part A is usually left in an unvulcanized or semi-vulcanized state, and in particular, the both ends 1a and 1b of the rubber-cola base 1 are abutted and vulcanized. Note that a lug is formed on the outer surface of the rubber crawler, and a core metal is embedded at a constant pitch in the longitudinal direction, but it is not shown here.

  However, when the rubber in the part A is vulcanized, naturally, a rubber flow occurs, and the steel cords 2a and 2b tend to be pulled along with this flow, as shown by the dotted line in FIG. In addition, the endless structure is completed in a state where the steel cord 2a side is curved 3 toward the butting side. The rubber crawler with the endless part applied is heavy in construction machinery, high-speed carriers, tractors, etc., and in high-speed vehicles, the stress strain at this part is large, cutting the steel cord 2 and bonding with rubber Further, there was a problem in the durability such as peeling of the rubber part 4 and cracks in the rubber part 4.

  As described above, the present invention eliminates the phenomenon that the steel cord is bent at the abutting portion in the endless structure in which the steel cords at both ends of the long rubber track substrate are overlapped and vulcanized. This is an improvement.

The gist of the first invention is that the steel cord is protruded from both ends of a long and end rubber crawler base body in which the steel cord is embedded in the longitudinal direction, and the protruding one steel cord and the other steel cord Is an endless structure of a rubber crawler that is placed on the inner side and the outer side and laminated and vulcanized and bonded, and the one of the rubber crawler bases in the unvulcanized or semi-vulcanized state is overlapped. From the other steel cord portion corresponding to the steel cord tip, to the opposite side of the other steel cord tip with respect to the longitudinal direction, away from the one steel cord tip and to the outside of the rubber crawler base towards weather before the vulcanization and - in which according to the endless construction of the rubber crawler multiplied by blanking.

The gist of the second invention is that the steel cord is protruded from both ends of a long and end rubber crawler base in which the steel cord is embedded in the longitudinal direction, and the protruding one steel cord and the other steel cord Is an endless structure of a rubber crawler that is placed on the inner side and the outer side and laminated and vulcanized and bonded, and the one of the rubber crawler bases in the unvulcanized or semi-vulcanized state is overlapped. Unvulcanized rubber material or vulcanized rubber material inside the other steel cord, from the other steel cord portion corresponding to the steel cord tip to the opposite side of the other steel cord tip in the longitudinal direction The present invention relates to an endless structure of a rubber crawler, which is characterized by sticking and overlapping.

  According to the present invention, distortion in the vicinity of the tip of the overlap portion of the steel cord is greatly relieved, and the inner side (roller side) rubber cracks are suppressed, and the corrosion of the steel cord is broken. Is an improvement.

  In the case of vulcanization with an endless structure, when there is little volume of rubber (uncured or semi-cured) at the butt portion, rubber flows from the outside (lug side), and this is why There is also a phenomenon that the door is dragged by the rubber flow and falls inside (the wheel side). When such a phenomenon occurs, the space between the tip of one steel code (inner side) is narrowed, and distortion occurs here, resulting in rubber breakage and loss of rubber. Further, when the steel cord is pulled in, the distance between the steel cord and the inner surface of the rubber crawler, that is, the rubber thickness is reduced, the interference force against the external force is reduced, and the rubber is also cracked here. Defects such as are seen.

  The present invention has been made on the basis of such knowledge, and the first is that the portion of the steel code on the side dragged by the rubber flow is directed to the side opposite to the dragged direction, specifically to the outside. A wave is applied in advance. As a result, even if dragged with the rubber, it will not fall greatly inward, and normally an endless structure is obtained with a little wave remaining. This avoids the concentration of strain on the site. The height of such a wave varies depending on the size of the rubber crawler and the type of steel code, but it is sufficient if the height is about 3 to 5 mm.

  Secondly, an unvulcanized rubber material or a vulcanized rubber material is stuck on a portion of the steel cord that is dragged by the rubber flow. Even if it is, it will be an endless structure that does not fall down greatly inside. This avoids the concentration of strain on the site.

  In addition, although the core metal is normally embedded in the rubber track, the concentration of distortion is small immediately above the core metal. For this reason, the best mode is to place the tip of the steel cord on this, and arrange the other wave corresponding to the cored bar.

Hereinafter, the present invention will be described in more detail with reference to examples.
FIG. 2 is a view of the endless portion showing the first embodiment of the first invention, and the wave is applied to the outer steel cord 2 corresponding to the front end 2b0 of the inner steel cord 2 superimposed. 11 is an example applied. In particular, in this example, a tip 2b0 and a wave 11 on the side of the steel cord 2b are arranged between the cores 5 and 5.

  In such an endless structure, even when the steel cord 2a is pulled inward during endless vulcanization, only the portion of the wave 11 is pulled directly. The distance between the cable 2b0 and the wave 11 is not narrowed, and the thickness between the inner peripheral surface and the inner peripheral surface can be kept sufficiently. Unlike the conventional endless structure, a great difference is exhibited in durability. It is a thing.

  FIG. 3 is a view of an endless portion showing a second embodiment of the first invention. In this example, the cored bar 50 is in the endless portion, and the tip 2b of the superposed inner steel cord 2 is the endless portion 2b. It is arranged on the core metal 50. On the other hand, the wave 11 is hung on a part of the outer steel cord 2a, and this is an example in which it is disposed on the cored bar 50.

  In such an endless structure, even when the steel cord 2a is pulled inward during rubber vulcanization, the wave 11 is only pulled slightly due to the presence of the core 50, and the steel cord Since the distance between the wires 2a and 2b is not narrow and the rubber is also filled in the wave 11, the distance between the steel cord tip 2b0 and the wave 11 is kept wide, and this portion The rubber is full, and even if a strain is applied to such a portion, the relaxation force is large, and, unlike the conventional endless structure, a great difference is expressed in durability.

  FIG. 4 is a view of the endless portion showing the first embodiment of the second invention. The rubber material 21 is attached to the outer steel cord 2 corresponding to the front end 2b0 of the inner steel cord 2 which is overlapped. It is an example formed by sticking. In particular, in this example, the tip 2b0 on the side of the steel cord 2b and the rubber material 21 are arranged between the cores 5 and 5.

  In such an endless structure, even when the steel cord 2a is pulled inward during the endless vulcanization, the rubber material 21 is pulled directly, and the rubber material 21 flows. The code 2a does not substantially change its position. Therefore, the distance between the steel code 2b0 and the steel code 2a is not narrowed, and the thickness between the inner peripheral surface is sufficient. Unlike the case of the conventional endless structure, a great difference in durability is expressed.

  FIG. 5 is a view of an endless portion showing a second embodiment of the present invention. In this example, the cored bar 50 is in the endless part, and the tip 2b of the superposed inner steel cord 2 is the cored bar. 50 is arranged above. On the other hand, the rubber material 21 adhered to the outer steel cord 2a is also an example in which the rubber material 21 is also disposed on the cored bar 50.

  In such an endless structure, even when the steel cord 2a is pulled inward at the time of rubber vulcanization, the rubber material 21 is only slightly pulled due to the presence of the cored bar 50. The space between 2a and 2b is not narrow, and the space is filled with rubber, and even if a strain is applied to such a part, the relaxation force is large, and also unlike the conventional endless structure, the durability is large. The difference is expressed.

  The present invention is as described above, and the vicinity of the tip of the overlap portion of the steel cord is greatly improved, and can be applied to all rubber crawlers having such an endless structure. The technical contribution is extremely large.

FIG. 1 is a view showing an endless structure of a conventional rubber track. FIG. 2 is a view showing a first example of the endless structure of the first invention. FIG. 3 is a view showing a second example of the endless structure of the first invention. FIG. 4 is a view showing a first example of the endless structure of the second invention. FIG. 5 is a view showing a second example of the endless structure of the second invention.

Explanation of symbols

1. Rubber rubber substrate,
1a, 1b ... both ends of the rubber track base,
2 Steel code,
2a, 2b ... both ends of the steel cord,
2b0 ... the tip of the steel cord 2b,
3. Curved part,
4. The rubber part inside the curved part,
5, 50 ... core,
11. Wave,
21. Rubber material.

Claims (7)

The steel cord is protruded from both ends of a long and end rubber crawler base that embeds the steel cord in the longitudinal direction, and the one steel cord and the other steel cord are arranged inside and outside. And an endless structure of a rubber crawler formed by overlapping and vulcanizing and bonding , and the other corresponding to the one end of the steel cord overlapped within the uncured or semi-cured portion of the rubber crawler base Before the vulcanization bonding, from the steel cord portion to the opposite side of the other steel cord tip with respect to the longitudinal direction, away from the one steel cord tip, and toward the outside of the rubber track base A rubber crawler endless structure characterized by applying a wave.   2. The endless structure of a rubber crawler according to claim 1, wherein the cored bar is embedded with a constant pitch in the longitudinal direction. The endless structure of the rubber crawler according to claim 1 or 2, wherein the wave is disposed on a mandrel. The steel cord is protruded from both ends of a long and end rubber crawler base that embeds the steel cord in the longitudinal direction, and the one steel cord and the other steel cord are arranged inside and outside. And an endless structure of a rubber crawler formed by overlapping and vulcanizing and bonding, and the other corresponding to the one end of the steel cord overlapped within the uncured or semi-cured portion of the rubber crawler base A rubber crawler characterized in that a rubber material is adhered and overlapped on the inside of the other steel cord from the portion of the steel cord to the opposite side of the other steel cord tip with respect to the longitudinal direction. Endless structure. The endless structure of a rubber crawler according to claim 4, wherein the rubber material is unvulcanized rubber. The endless structure of a rubber crawler according to claim 4, wherein the rubber material is vulcanized rubber. One overlapping portion protruding from an end portion of the rubber crawler base body from which the one steel cord protrudes;
The other steel cord protruding from the end of the rubber crawler base projecting from the other steel cord, and the other overlapping portion to be superimposed on the one overlapping portion;
Have
5. The rubber crawler according to claim 4, wherein the rubber material is provided at a corner formed by an end surface of an end portion of the rubber crawler base from which the other steel cord protrudes and a lower surface of the other overlapping portion. Endless structure.

Images