JP2008120388A - Crawler structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a crawler used for a traveling part of a traveling vehicle to prevent a crack resulting from the width of a core metal. <P>SOLUTION: In the crawler comprising a rubber elastic body, the core metal buried in the rubber elastic body perpendicularly to a traveling direction, and a rubber lug formed on the outer circumferential surface so as to face the core metal. Width ends of the core metal are continuously curved toward the inner circumference to curve the outer circumferential surface at the width ends of the core metal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in the structure of a crawler used for a traveling portion of a traveling vehicle.

  In recent years, a cored bar has been embedded at a constant pitch in an endless rubber elastic body as a running part of a construction machine or a civil engineering machine, and a steel cord has been embedded to surround the cored bar and to reinforce circumferential tension. An iron shoe crawler composed of a so-called rubber crawler and an iron crawler belt attached to the link is widely used, and particularly in an iron shoe crawler, a rubber shoe can be attached instead of the iron crawler belt to travel on the road. Has been done.

  In the present invention, the rubber crawler and the rubber shoe are hereinafter collectively referred to as a crawler. However, such a crawler particularly has a width end of a core bar embedded in the crawler when riding on a protrusion such as a stone on a traveling road or a curb on a sidewalk. The rubber is sandwiched between the pebbles and the shearing force acts strongly. When this is repeated, the rubber cracks along the width end of the cored bar, resulting in poor durability.

  FIG. 3 is a diagram showing this state. When the crawler 30 rides on the pebbles 31, the width end 33 of the cored bar 32 becomes an edge, and the rubber 34 has a crack a toward the edge. End up. This phenomenon is the same for both the above-described rubber crawler and rubber shoe, and cracks are generated in the same manner with respect to the cored bar embedded in the rubber.

  The present invention aims to prevent cracks caused by the width portion of the cored bar, and devise the width part of the cored bar.

  The present invention has been made in order to solve the above problems, and the gist thereof is that a rubber elastic body, a core metal embedded in the rubber elastic body at a right angle to the running direction, and a rubber lug on the outer peripheral surface are provided. A crawler structure formed corresponding to the cored bar, wherein the width end of the cored bar is bent to the inner peripheral side to curve the outer peripheral surface of the cored bar, and the width end of the cored bar is curved. The crawler structure is characterized in that a built-up portion is formed on the inner peripheral side of the tip, and preferably a rubber bulge that covers the tip of the cored bar is formed. Preferably, the outer peripheral surface at the width end of the rubber lug has a shape facing the outer peripheral surface at the width end of the cored bar.

  The present invention is a crawler structure having the above-described structure, and even when a large strain is applied to the end portion of the crawler width, the strain does not concentrate at one place on the core metal. The lifetime is significantly increased.

  In the crawler structure according to the present invention, the width end of the core bar is continuously bent toward the inner peripheral side, and the core bar is embedded near the width end of the rubber crawler. The rubber at the end portion of the core metal is less deformed even when it rides on the inner peripheral side, so that the strain concentration at the end portion of the crawler width is reduced. Further, the thickness of the rubber part on the grounding side is increased by the amount of curvature of the outer peripheral surface of the cored bar, and the distortion can be absorbed also by this. Furthermore, by making the inner peripheral side of the bent metal core particularly round on the inner peripheral side, deformation of the rubber at the metal core end to the inner peripheral side can be further reduced, and further effects are exhibited. It will be possible.

  The crawler of the present invention can be applied not only to the cored bar embedded in the endless rubber crawler as described above, but also to the cored bar used for coupling the iron shoe with the iron shoe alone or over the plurality of iron shoes. Needless to say, it can be applied.

  It should be noted that the curvature of the outer peripheral surface of the core metal referred to in the present invention is not necessarily a single curve, and it is needless to say that it includes a plurality of curves or a plurality of straight lines as a whole. By bending the surface, the starting point of the strain becomes more inside and can be dispersed.

  Hereinafter, the crawler of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a cross-sectional view in the width direction applied to a rubber crawler. The figure is a cross-sectional view at a portion where the core metal 1 is embedded. The wing portions 2 and 3 of the core metal 1 are embedded in the rubber elastic body 4, and the steel cord 5 surrounds the wing portions 2 and 3. Is buried.

  The tips 6 and 7 of the wings 2 and 3 are bent to the inner peripheral side and the outer peripheral surface 8 is curved. Further, the built-up portions 9 and 10 are formed on the inner peripheral side of the tips 6 and 7. It has been done. In the figure, reference numerals 11 and 12 denote corner portions formed by sandwiching the central portion 13 of the core bar 1 and provide a function to prevent the unillustrated track rollers, sprockets, idlers and the like from coming off. In addition, the center part 13 of the metal core 1 is an engaging part with a sprocket.

  A rubber lug 14 is provided on the outer peripheral side of the rubber elastic body 4, and in this example, both ends 15, 16 of the rubber lug are curved to correspond to the curvature of the core metal 1. . Of course, it goes without saying that both ends 15 and 16 of the rubber lug can be extended to the left and right as indicated by the dotted lines.

  For this reason, since the outer peripheral surface 8 of the tips 6 and 7 of the cored bar 1 is curved even when riding on a rubber crawler or pebbles, the strain applied to the rubber is not concentrated and the generation of cracks is reduced. It has become.

  The rubber bumps were formed on the inner circumference of the rubber crawler so as to cover the tips 6 and 7 of the core bar 1, but this prevented the tips 6, 7 of the core bar 1 from being exposed on the inner peripheral surface of the rubber crawler. This may be formed over the entire length along the length direction of the rubber crawler, or it may be formed only at a portion corresponding to the tips 6 and 7 of the core metal 1.

  FIG. 2 is a sectional view showing an example in which the present invention is applied to a rubber shoe. In the figure, reference numeral 21 denotes a cored bar, and a rubber elastic body 25 is vulcanized and bonded to the outer peripheral side 24 including both the wing portions 22 and 23, and both wings 22 and 23 are connected to the inner periphery by two straight lines 26 and 27. The curved portion is formed on the outer peripheral surface 24 of the cored bar 21 as a whole. In the figure, 28 is a bolt insertion hole used for mounting with an iron shoe (not shown), and penetrates the rubber lug 29 and the core metal 21.

  The rubber lug 29 is also formed by rounding up the opposite ends of the rubber lugs 29 toward the inner peripheral side so as to face the curved portion 24 of the core metal 21, and rubber strain is concentrated on one location of the core metal 21. This reduces the occurrence of cracks. Of course, the rubber lug 29 can be extended as shown by the dotted lines in the same manner as the rubber lug 14 described above.

FIG. 1 is a cross-sectional view in the width direction applied to a rubber crawler. FIG. 2 is a partial sectional view showing an example in which the present invention is applied to a rubber shoe. FIG. 3 is a state diagram when riding on a conventional crawler.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core metal 2, 3 Core metal wing part 4 Rubber elastic body 5 Steel cord 6, 7 Tip of wing part 8 Outer peripheral surface of wing part 9, 10, Overlay part 11, 12 Corner part of core metal 13 Core metal 14 Rubber lugs 15 and 16 Both ends of rubber lug 21 Core metal 22, 23 Core metal wing part 24 Outer peripheral side (curved part) of core metal wing part
25 Rubber elastic body 26, 27 Tip of wing part of core metal 28 Bolt insertion hole 29 Rubber lug

Claims (3)

  A rubber elastic body, a core metal embedded in the rubber elastic body at a right angle to the running direction, and a crawler structure in which a rubber lug is formed on the outer peripheral surface corresponding to the core metal, The crawler is characterized in that the outer peripheral surface of the width end of the core metal is curved by continuously bending the inner end to the inner peripheral side, and a built-up portion is formed on the inner peripheral side of the curved end of the width end of the core metal. Construction.   The crawler structure according to claim 1, wherein a rubber ridge is formed to cover the tip of the mandrel.   The crawler structure according to claim 1 or 2, wherein the outer peripheral surface of the rubber lug at the width end faces the outer peripheral surface of the width end of the metal core.

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