JP2008126749A - Rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber crawler preventing the intrusion of mud or the like from a hole by closing the sprocket hole and preventing the early breaking of a membrane body by peeling off the mud or the like deposited on the outer surface of the membrane body from the membrane body before solidification to maintain the closure of the sprocket hole for a long period of time. <P>SOLUTION: In the rubber crawler, a rubber lug is formed on the outer peripheral side of an endless rubber elastic body, a core metal and a steel cord surrounding the core metal are simultaneously buried inside at a constant pitch, and the sprocket hole is formed between the core metals. A bellows membrane formed of rubber is formed on the sprocket hole. The rubber elastic body 1, the rubber lug 2, the core metal 3, the steel cord 4, the sprocket hole 5, and the bellows membrane 10 are provided in the rubber crawler. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rubber crawler, and is mainly used for a traveling device for agricultural equipment such as a combine.

  A rubber crawler used in a traveling device of an agricultural machine has a structure in which a rubber lug is formed on the outer peripheral side of an endless rubber elastic body, a core metal is embedded at a constant pitch, and a sprocket hole is provided between the core bars. This is wound around a sprocket and an idler installed on the agricultural equipment, and the sprocket hole and the sprocket mesh with each other to transmit the driving force. In addition, the rolling wheels provided on the farm equipment roll on the inner peripheral surface of the rubber track.

  Therefore, when traveling on a road surface or in a farm field, there is a phenomenon in which dirt, gravel, pebbles and other foreign matters enter the inner peripheral side through the sprocket holes, and the intruder is stepped on the wheels and hardens. If this is repeated, the rubber on the rolling surface of the roller of the rubber crawler deteriorates and is damaged, causing a so-called worm-eating phenomenon to the rubber, causing a de-ringing phenomenon with the rolling wheel, and various causes for this. It is said that problems will occur.

  For this reason, a plurality of proposals have been made conventionally. Patent Document 1 proposes a method of closing a sprocket hole with a thin rubber layer, and Patent Document 2 proposes a method of forming a slit in the thin rubber layer.

JP 56-88671 A

Japanese Utility Model Publication No. 61-14944

  In these conventional examples, since the sprocket hole is closed with a rubber film, it is true that dirt or the like can be prevented from entering to some extent, but it is inevitable that mud etc. will harden and harden at the rubber film part. The actual situation is that the rubber film is pushed and torn by this, and a sufficient result cannot be left.

  In recent years, Patent Document 3 has been proposed, which is a proposal to make the rubber film a little thicker and to prevent the mud and the like from hardening by elastically oscillating the rubber film itself so as to facilitate its removal.

JP 2003-63461 A

  In this proposal, a constricted groove is formed in the rubber film in order to vibrate a thick rubber film. However, in actual use, strain concentrates on the thin constricted groove, and this part is broken. Therefore, it is good as long as the amplitude motion is generated, but after the tear occurs, the actual result is the same as the case of the conventional rubber crawler described above.

  The present invention closes the sprocket hole to prevent intrusion of mud etc. from the hole, and removes mud etc. adhering to the outer surface of the film body from the film body before solidification, thereby premature tearing of the film body. The present invention provides a rubber crawler that prevents the sprocket hole from being closed for a long period of time.

  The gist of the present invention is that a rubber lug is formed on the outer peripheral side of an endless rubber elastic body, and a cored bar and a steel cord surrounding the cored bar are simultaneously embedded at a constant pitch in the rubber lug. A rubber crawler provided with sprocket holes between gold, and a rubber crawler characterized in that a rubber bellows film is formed on the sprocket holes. The peritoneum is formed on the outer peripheral side of the steel cord embedding position (Claim 2), and the bellows is formed mainly in a direction extending in the longitudinal direction of the rubber elastic body (Claim 3). It is a thing.

  The rubber crawler of the present invention is provided with a rubber bellows film in a meshing hole with a sprocket, and it is possible to prevent mud from entering through the sprocket hole over a long period of time. This problem can be solved, and adhesion of mud and the like is prevented by using a rubber bellows film. Of course, by using the bellows membrane, it is possible to withstand elongation even when the rubber crawler is bent, and to hold the membrane within a normal use period without being damaged.

  The present invention is provided with a bellows film at this portion so that mud or the like does not enter the inner peripheral side from a sprocket hole penetrating the inside and outside of the rubber crawler, thereby preventing entry of mud or the like. Is. Preferably, the film is formed on the outer peripheral side of the position where the steel code is embedded, and when the rubber track is bent by a sprocket or the like, the steel code is formed. The position where is embedded is the neutral surface of the tension, and the outer peripheral side receives an extension force. Therefore, by locating the bellows membrane on the outside, the bellows membrane is pulled and the bellows moves repeatedly. For this reason, the mud etc. adhering to this bellows film work to fall without solidifying on this surface. Further, as the direction of the bellows membrane, the bellows membrane is stretched in accordance with the extension direction of the rubber elastic body by forming mainly in the direction of extending in the longitudinal direction of the rubber elastic body, and mud adhering to this It was possible to drop it without difficulty.

  It is preferable that the bellows membrane is formed at least 30 mm away from the top surface of the rubber lug so that the bellows membrane does not always contact the running surface. Further, the thickness of the bellows membrane is required to be about 0.5 to 3 mm from the viewpoint of the strength of the membrane and further from the viewpoint of the ease of extension of the bellows membrane. When the thickness is 0.5 mm or less, manufacturing is difficult, and when it is 3 mm or more, elongation resistance is expected to increase. On the other hand, it is needless to say that the bellows membrane is preferably provided at a position where the membrane and the sprocket meshing with the sprocket hole are not always in contact with each other.

  Hereinafter, the present invention will be described in more detail with reference to examples. FIG. 1 is a plan view of the outer periphery of a normal rubber track, and FIG. Reference numeral 1 denotes an endless rubber elastic body that forms a base of a rubber track, and is continuous in the vertical direction of FIG. 2 is a rubber lug formed on the outer periphery thereof, 3 is a metal core, and 4 is a steel cord. The core metal 3 is embedded in the rubber elastic body 1 with a constant pitch, and the steel cord 4 is similarly embedded so as to surround this from the outside.

  Between the core bars 3 and 3, sprocket holes 5 that mesh with sprockets (not shown) are dotted in the longitudinal direction of the rubber elastic body 1. Since the sprocket hole 5 is formed so as to penetrate inside and outside the rubber elastic body 1, mud or the like enters the inner peripheral side from the outer peripheral side in particular, and the athlete's foot phenomenon particularly occurs on the rolling surface of the rolling wheel (not shown). Tends to cause problems such as a phenomenon of wheel-removal with a wheel.

  FIG. 3 is a cross-sectional view similar to FIG. 2 showing a specific example of the rubber track described in Patent Document 3 described above. In this example, a flat rubber film 7 is formed in the sprocket hole 5 so as to close it, and constricted grooves 8, 8 are formed on both the left and right sides. Since the rubber film 7 is relatively thick, even if there is a vibration phenomenon of the rubber film 7, it is unavoidable that the constricted groove 8 is torn by pressure such as mud. It can also be said that this is a factor that lowers durability due to the insect bite phenomenon on the inner peripheral surface of the body 1 and is far from the fundamental solution.

  FIG. 4 is a plan view of the outer periphery of the rubber track of the present invention, and FIG. 5 is a partially enlarged view thereof. 6 is a cross-sectional view taken along line BB, and FIG. 7 is a cross-sectional view taken along line CC. Reference numeral 10 denotes a bellows-like rubber film so as to close the sprocket hole 5. In this example, the rubber film 10 has the bellows direction aligned with the longitudinal direction of the rubber elastic body 1.

  The bellows membrane 10 is formed at a position substantially matching the outer peripheral surface of the rubber elastic body 1, and is formed outside the position where the steel cord 4 is embedded. For this reason, the bellows membrane 10 is repeatedly stretched because it is outside the steel cord 4 which becomes the neutral surface of the rubber expansion and contraction when the rubber crawler is wound around the sprocket. Mud or the like attached to the peritoneum 10 is effectively shaken off. Of course, this position is usually a position that does not come into contact with the sprocket, and damage to the bellows membrane or the like basically does not occur due to contact with this position.

  In the present invention, the bellows film 10 that closes the sprocket hole 5 has no constricted groove as shown in FIG. For this reason, since there is no site | part to which the pressure by mud etc. concentrates, the tear of the bellows membrane 10 does not generate | occur | produce and it is clear that the effect continues long.

  The present invention is as described above, and foreign matter such as mud can be prevented from entering the inner peripheral surface through the sprocket hole, thereby making it possible to prevent derailment and the occurrence of insect bite phenomenon, The present invention can be applied not only to agricultural equipment but also to various rubber crawlers, and its range of use is extremely wide.

FIG. 1 is a plan view of the outer periphery of a normal rubber track. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a cross-sectional view similar to FIG. 2 showing an example of a rubber crawler described in Patent Document 3. FIG. 4 is a plan view of the outer periphery of the rubber track of the present invention. FIG. 5 is a partially enlarged view of FIG. 6 is a cross-sectional view taken along line BB in FIG. 7 is a cross-sectional view taken along the line CC of FIG.

Explanation of symbols

1. Rubber elastic body,
2. Rubber rug,
3. Core metal,
4. Steel code,
5. Sprocket hole,
10. The bellows membrane.

Claims (3)

  A rubber lug is formed on the outer peripheral side of an endless rubber elastic body, and a cored bar and a steel cord that surrounds the cored bar are simultaneously embedded at a constant pitch, and a sprocket hole is formed between the cored bars. A rubber crawler, characterized in that a rubber bellows film is formed in the sprocket hole.   2. The rubber crawler according to claim 1, wherein the bellows membrane is formed on the outer peripheral side of the steel cord embedment position.   The rubber crawler according to claim 1 or 2, wherein the bellows membrane is formed in a direction extending in a longitudinal direction of the rubber elastic body.

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