JP2006117064A - Rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber crawler structured so that the coming-in and going-out of earth and sand through a sprocket engaging hole is controlled, capable of precluding intrusion of the earth and sand from the periphery and exhausting the earth and sand from the inside surface. <P>SOLUTION: The crawler 1 is structured so that cores 2 are embedded at a constant pitch in the longitudinal direction of an endless resilient member of rubber and simultaneously steel cords are embedded surrounding the outside of the cores, in which sprocket engaging holes 4 are provided between adjoining cores, wherein a lid 10 is installed which is given a trend of covering the holes from the peripheral side and consolidated with the resilient member in straight form. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a cored core crawler, and relates to a crawler that controls the entry and exit of earth and sand from a sprocket engagement hole.

  In a normal crawler, a metal core is embedded at a constant pitch in the longitudinal direction of the crawler, and a steel cord is similarly embedded around the core. Then, an engagement hole with a sprocket is opened between adjacent core bars, and is used for transmission of driving force.

  The crawler is shaped so that the inner and outer surfaces penetrate through the sprocket engagement holes. For this reason, the outer earth and sand of the crawler enters the inside through the sprocket engagement hole, and the rollers or the like step on this to roughen the inner peripheral surface of the crawler, resulting in the crawler cracking or rubber chipping. Has been pointed out.

For this reason, it is proposed to close the sprocket engagement hole with a relatively thick film body, or there is a technique in which a slit is formed in the film body (Patent Documents 1 and 2). Although this is effective on one side, the sprocket engagement hole has a role of discharging the earth and sand that has entered the inner peripheral surface of the crawler to the outside, but it is not possible to fulfill this role. Problems are also pointed out.
JP 2004-216936 A JP 56-88671 A

  In the former, there is no intrusion of earth and sand from the outer peripheral side, but the earth and sand accumulated on the inner peripheral side is not discharged, and the engagement with the sprocket is continued as it is, and problems such as tooth skipping occur.

  In the latter case, it is inevitable that the intrusion of earth and sand will intrude into the inner peripheral side from the slit of the membrane part, and this earth and sand will be difficult to discharge this time. It is inevitable that cracks will be generated.

  The present invention relates to a crawler that controls the entry and exit of earth and sand from a sprocket engagement hole, and prevents the entry of earth and sand from the outer peripheral side and can discharge the earth and sand from the inner peripheral side. Is to provide.

  In the present invention, a cored bar is embedded at a constant pitch in the longitudinal direction of an endless rubber elastic body, and a steel cord is embedded at the same time so as to surround the outer side of the cored bar. A crawler provided with a joint hole, which is provided with a lid body that is brazed so as to cover the engagement hole from the outer peripheral side and is linearly integrated with a rubber elastic body. A crawler is provided.

  The present invention is as described above, and is provided with a lid from the outer peripheral side of the engagement hole, and not only can prevent intrusion of earth and sand from the outer peripheral side, but also discharge of earth and sand from the inner peripheral side is engaged. When it accumulates in the hole, it has a function of naturally opening the lid and discharging it, and reduces the inconvenience of the inner peripheral surface of the crawler due to intrusion of earth and sand.

  The lid according to the present invention is usually brazed so as to be in contact with the engaging hole, so that the intrusion of earth and sand from the outer peripheral side is extremely small, and the pressure by the sand on the inner peripheral side becomes larger than this brazing force. In this case, the lid opens and the earth and sand are discharged to the outer peripheral side. This brazing is performed at the same time as rubber vulcanization. Of course, the lid body does not fit into the engagement hole but serves as a lid, and therefore has a shape larger than the size of the outer periphery side of the engagement hole. Has an inclined surface or a stepped portion toward the outer peripheral side so that a part or the periphery of the engagement hole enlarges the shape of the outer peripheral side, and the lid body has a shape that fits in the inclined surface or stepped portion. It is preferable.

  In addition, the lid body behaves like a check valve, so that one side of the lid body is integrated with the rubber elastic body in a straight line so that the lid body can be opened. It is necessary to This integration direction can be either the front-rear direction or the left-right direction of the crawler.

  This lid is formed integrally with the molding of the crawler. Except for the part integrated with the rubber elastic body in a straight line, the lid is initially formed through a rubber film with a thin engagement hole. The lid is closed, and the membrane is torn during use so that the lid can behave. Such a thin rubber film is the same as a burr formed by a so-called mold forming process, and can be easily broken by the pressure of earth and sand to perform the original movement as a lid.

  The relationship between the lid and the engagement hole covers the outer periphery of the engagement hole, and the engagement hole may be formed and covered from the outer periphery. A form in which only one side of the hole is integrated and the other side can be opened is preferable.

Hereinafter, the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a plan view of the inner peripheral side of a first example of the crawler of the present invention, and FIG. In the figure, 1 is a crawler, 2 is a cored bar embedded at a constant pitch in the longitudinal direction of the crawler 1, and the steel cord 3 is surrounded by surrounding the cored bar 2 from the outer peripheral side. It was buried at the same time. An engagement hole 4 with a sprocket is formed between the metal cores 2 and 2. In the present invention, a lid 10 that covers the engagement hole 4 from the outside is provided. It is. Reference numeral 5 denotes a lug formed on the outer peripheral side.

  The lid 10 is formed integrally with the side a of the engagement hole 4 between the cover 10 and the crawler 1, and the other side is separated from the engagement hole 4. In this example, the lid body 10 is formed at substantially the same position as the engagement hole 4, and the slit 12 is formed so as to be inclined so that the outer peripheral side of the crawler of the engagement hole 4 is widened. The inclined slit 12 allows the lid 10 to open to the outer peripheral side but not to the inner peripheral side, so that earth and sand from the outer peripheral side enter the inner peripheral side of the crawler. On the other hand, the earth and sand collected on the inner peripheral side can be discharged when the lid 10 opens to the outer peripheral side.

  The integration 11 with the crawler 1 is integrated at the side a in the longitudinal direction of the crawler in this example, but it may be the side a in the width direction as shown in the second example of FIG. The inclined slit 12 can be a stepped portion 13.

  FIG. 4 is a view similar to FIG. 2 showing the third example. In this example, the lid body 10 is provided on the outer peripheral side of the engagement hole 4. The intrusion and discharge of earth and sand is the same as the previous example.

  FIG. 5 shows a fourth example and is similar to FIG. FIG. 6 is an enlarged view thereof. In this example, the lid body 10 is divided into two in the vertical or horizontal direction. The crawler is integrated 11 on one side a in the longitudinal direction or the width direction, and all other sides are inclined surfaces. Or it is open | released via the step part etc., and the earth and sand from an outer peripheral side do not penetrate | invade by this, but only the inner and outer earth side sediment is discharged | emitted.

  The present invention is as described above, which improves the defect of the engagement hole with the sprocket that penetrates the inner and outer peripheries of the crawler, and conversely allows only the inner and outer soil to be discharged. Applicable regardless of size.

FIG. 1 is a plan view of the inner peripheral side showing a first example of the crawler of the present invention. FIG. 2 is a cross-sectional view of the engagement hole at the center. FIG. 3 is a cross-sectional view of the engagement hole portion of the second example of the crawler of the present invention. FIG. 4 is a cross-sectional view of the engagement hole portion of the third example of the crawler of the present invention. FIG. 5 is a plan view of the inner peripheral side of a fourth example of the crawler of the present invention. FIG. 6 is a partially enlarged view of FIG.

Explanation of symbols

1. Crawler,
2. Core metal,
3. Steel code,
4 ... engagement hole with sprocket,
5 ... Rug,
10. The lid,
11. The integrated part of the lid with the crawler
12. Inclined slit,
13. Stepped part,
a ... The side to be united.

Claims (3)

  A cored bar is embedded at a constant pitch in the longitudinal direction of the endless rubber elastic body, a steel cord is embedded at the same time surrounding the outer side of the cored bar, and a sprocket engagement hole is provided between adjacent cored bars. A crawler provided with a lid body that is brazed so as to cover the engagement hole from the outer peripheral side and integrated with a rubber elastic body in a straight line shape.   The crawler according to claim 1, wherein the engagement hole has an inclined surface or a stepped portion toward the outer peripheral side.   The crawler according to claim 2, wherein the lid has an outer shape that fits within an inclined surface or a step portion of the engagement hole.

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