JP2010247596A - Rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide core bars enabling reduction of weight by securing required overlap amount. <P>SOLUTION: A rubber crawler includes the core bars which are buried for every prescribed interval in all regions of a peripheral direction of an endless crawler body and include a pair of guide projections 14 having distal ends projecting with a prescribed space on a side of an inner peripheral surface of the crawler body as rolling wheel passing surfaces 16. In each of the pair of guide projections 14, the rolling wheel passing surface 16 is formed into a slender shape, and the mutual interval of the rolling wheel passing surfaces 16 of each guide projection 14 is formed to be continuously and gradually narrower toward one direction A of the crawler peripheral direction. In each of the core bars 10, the pair of guide projections 14 is buried to be mutually overlapped with the rolling wheel passing surfaces 16 of the pair of guide projections 14 of the core bars 10 provided adjacently on front and rear sides of the crawler peripheral direction in a crawler width direction. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rubber crawler, and in particular, a rubber including a core bar that is embedded in parallel along a circumferential direction of a crawler main body and has a pair of guide protrusions protruding from the inner peripheral surface side of the crawler main body. Regarding crawlers.

  A rubber crawler having a cored bar inside has a plurality of cored bars arranged in the circumferential direction of the rubber crawler. The cores are usually all the same shape. A pair of guide protrusions are formed on the core metal at a substantially central portion in the crawler width direction, a sprocket and an idler pass between these guide protrusions, and a wheel passes at the tip of the pair of guide protrusions. A wheel passing portion having a wheel passing surface to be formed is formed. Note that the sprocket and idler give a driving force to the rubber crawler, and the wheels are for smoothly moving the rubber crawler forward and backward.

  Patent Documents 1 and 2 disclose examples of rubber crawlers in which a core metal having a pair of guide protrusions is embedded as described above. FIG. 6 is an explanatory view illustrating the structure of the rubber crawler core metal and the guide protrusions of the metal core described in Patent Documents 1 and 2. As shown in the drawing, a plurality of core bars 10 are arranged in parallel in the crawler circumferential direction, and a pair of guide protrusions 120-1 are provided on the inner peripheral surface side of each of the core bars 10-1 to 10-3. 120-2 is protrudingly formed.

  A wheel passing part having a wheel passing surface through which the wheel passes in the guide projections 120-1 and 120-2 is located at the front side in the crawler circumferential direction at the inner side in the crawler width direction of the main body part 12 (front in the wheel passing direction) Inner wheel passing portions 120a-1 and 120a-2 extending in the direction of arrow A, and outer wheel passing portions 120b extending in the direction of arrow B indicating the rear in the crawler circumferential direction at positions closer to the outer side in the crawler width direction of the main body 12 -1, 120b-2, and base end connecting portions 120c-1, 120c- which are portions connecting the inner wheel passing portions 120a-1, 120a-2 and the outer wheel passing portions 120b-1, 120b-2. It is comprised by 2.

  And one inner side roller passing part 120a-1, 120a-2 between adjacent cored bars 10-1 and 10-2 and 10-2 and 10-3 is the other outer side wheel passing part 120b-. 1, 120b-2 and the overlap portion O overlap in the width direction of the crawler body. In this overlap portion O, the wheel is transferred. Accordingly, in this way, a plurality of roller passing portions of the guide protrusions 120 of each core metal body 10 secure the overlap portion O, and a plurality of rollers are gathered and aligned in the crawler circumferential direction. The passage of the passage surface is smooth, and smooth running without vibration of the vehicle equipped with the rubber crawler is achieved. Further, by securing the overlap portion O, the engagement state between the inner wheel passing portions 120a-1 and 120a-2 and the outer wheel passing portions 120b-1 and 120b-2 is stabilized, and so-called dislocation is prevented. You can also.

JP-A-2-267084 JP-A-9-150759

  In the guide protrusions 120-1 and 120-2 of the cored bar in the rubber crawler described in Patent Documents 1 and 2, the inner wheel passing portions 120a-1 and 120a-2 and the outer wheel passing portions 120b-1 and 120b- Although the overlap portion O having a certain size can be secured between the inner wheel passing portions 120a-1 and 120a-2 and the outer wheel passing portion 120b- Since 1, 120b-2 is provided on one cored bar, it is necessary to form a base end coupling portion 120c having a large mass, which has a problem in terms of weight reduction. On the other hand, if the lengths of the inner wheel passing portions 120a-1 and 120a-2 and the outer wheel passing portions 120b-1 and 120b-2 are shortened to reduce the weight, the overlap portion O becomes smaller and the guide protrusions. It can be considered that the engagement relationship between 120 is adversely affected.

  This invention is made | formed in view of such a situation, The objective is to provide the metal core which can reduce a weight, ensuring a required overlap amount.

  In order to solve the above problem, the rubber crawler according to claim 1 is embedded at predetermined intervals in the entire circumferential direction of the endless crawler body, and protrudes with a predetermined interval on the inner peripheral surface side of the crawler body. In the rubber crawler having a mandrel having a pair of guide protrusions whose front ends are wheel passing surfaces, the pair of guide protrusions are formed so that the wheel passing surface is elongated, and the guide protrusions The distance between the roller passing surfaces is formed so as to be gradually and gradually narrow in one direction of the crawler circumferential direction, and each of the core bars has a pair of guide projections in front and rear in the crawler circumferential direction. It is characterized by being embedded so as to overlap each other in the crawler width direction with a wheel passing surface of a pair of guide protrusions of the adjacent cored bar.

  According to this, instead of engaging the guide projections of the core bars adjacent to each other by forming portions with different facing intervals like the conventional inner wheel passage portion and the outer wheel passage portion. The distance between the pair of guide protrusions provided on the rear metal core is the largest among the two adjacent metal cores so that the gap between the guide protrusions is continuously reduced in the passing direction of the wheel. Engagement between the guide projections can be achieved by inserting the narrowed portion into the portion where the distance between the pair of guide projections provided on the front metal core is the widest. Therefore, a sufficient overlap amount and a stable engagement state between the guide protrusions can be ensured without forming a high mass portion like the conventional proximal end coupling portion.

  According to a second aspect of the present invention, in the rubber crawler according to the first aspect, the wheel passing surfaces of the pair of guide protrusions are convex toward the central portion of the core metal when viewed from the inner peripheral surface side. It has the curved part which becomes.

  According to this, as compared with the case where the roller passing surface of the guide protrusion is formed in a straight line shape, the necessary overlap amount can be ensured in a shorter length region in the crawler circumferential direction. The extension length of the protrusion itself can be shortened to further reduce the weight.

  According to a third aspect of the present invention, in the rubber crawler according to the first or second aspect, a tapered portion having a gradually narrowing width toward the tip is formed on the wheel passing surface of the pair of guide protrusions. It is characterized by.

  According to this, it is possible to further reduce the impact of the transfer of the wheel at the overlap portion between the guide protrusions of the core metal body arranged in the front and back, and the rubber crawler embedded with the metal core according to the present invention is attached. It is possible to further improve the riding comfort of the vehicle.

  According to a fourth aspect of the present invention, in the rubber crawler according to any one of the first to third aspects, an angle formed between the extending direction of the roller passing surface of the guide protrusion and the circumferential direction of the crawler body is 5. It is characterized by being in a range of ° to 25 °. Thereby, the amount of overlap can be made suitable.

  According to the rubber crawler according to the present invention, the opposing distance between the guide protrusions is continuously reduced toward the passing direction of the roller wheel, and is provided on the rear metal core among the two adjacent metal bars. The portion where the distance between the pair of guide protrusions is the narrowest is inserted into the portion where the distance between the pair of guide protrusions provided on the front metal core is the widest, thereby engaging the guide protrusions with each other. Can be achieved. Therefore, a sufficient overlap amount and a stable engagement state between the guide protrusions can be ensured without forming a high mass portion like the conventional proximal end coupling portion. Thereby, it is possible to reduce the overall weight of the rubber crawler while securing a necessary overlap amount and achieving a smooth passing of the wheel on the wheel passing surface.

It is explanatory drawing explaining the structure of the guide protrusion provided in the metal core in the rubber crawler concerning this Embodiment. It is a figure explaining the side structure of a metal core main body and a guide protrusion. It is a figure explaining the difference in the magnitude | size of the guide protrusion in this Embodiment, and the conventional guide protrusion. It is a figure explaining the structure of the guide protrusion of another form. It is a figure explaining the structure of the guide protrusion of another form. It is a figure explaining a prior art.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a view for explaining the structure of guide protrusions provided on a core bar in a rubber crawler according to the present embodiment. In particular, FIG. 1 shows a plan view of a plurality of core bars 10 (three in the figure) embedded along the circumferential direction of the crawler body, and FIG. 2 schematically shows a side structure of the core bars 10 and guide protrusions. FIG.

  As shown in the drawing, the cored bar 10-1 is provided with a pair of guide protrusions 14-1 and 14-2 that protrude toward the inner peripheral surface side of the crawler main body with the longitudinal center portion interposed therebetween. The guide protrusion 14 is formed integrally with the cored bar 10, and a tip portion thereof is formed as a wheel passing part 16 that forms a wheel passing surface through which the wheel passes.

  The pair of guide protrusions 14-1 and 14-2 includes one end portions 14a-1 and 14a-2 and the other end portions 14b-1 and 14b-2 that protrude from both side ends of the cored bar 10 in the crawler circumferential direction. ing. And in this Embodiment, the opposing space | interval d between this pair of guide protrusion 14-1, 14-2 becomes narrow gradually continuously toward the arrow A direction which is one side of the crawler circumferential direction. Specifically, the respective wheel passage passing portions 16-1 and 16-2 of the guide protrusions 14-1 and 14-2 are substantially eight-shaped when viewed in plan (viewed from the inner peripheral surface side of the crawler body). It is formed in a linear shape.

  And in the rubber crawler concerning this Embodiment, the metal cores 10-2 and 10-3 which have a structure substantially the same as the said metal core 10-1 are embed | buried in parallel. In this embedded state, the one end portions 14a-1 and 14a-2 of the pair of guide protrusions 14-1 and 14-2 of the core metal 10-2 (10-3) are the core metal 10-1 (10-2). Crawler width direction between the other end portions 14b-1 and 14b-2 of the pair of guide protrusions 14-1 and 14-2 and the core bars 10-1 and 10-2 (10-2 and 10-3). And overlap part O is formed.

  The guide protrusions 14 of the metal core 10 in the present embodiment having the above-described configuration are opposed to each other like the conventional inner wheel passage portion 120-1 and outer wheel passage portion 120-2 shown in FIG. Since the gap between the guide protrusions 14 is continuously reduced in the direction of the arrow A without providing the base end coupling portion 120c necessary for forming the two different portions, the high mass portion A sufficient amount of overlap and a stable engagement state between the guide protrusions can be ensured without forming. In the present embodiment, the angle formed between the extending direction of the wheel passing portions 16-1 and 16-2 of the guide protrusions 14-1 and 14-2 and the circumferential direction of the crawler body is in the range of 5 ° to 25 °. It is preferable that Thereby, the magnitude | size of the overlap part O can be made suitable.

  In FIG. 3, the area in plan view of the wheel passing portion of the guide protrusion 120 having the conventional proximal end coupling portion and the wheel passing portion 16 of the guide protrusion 14 in the present embodiment (area of the wheel passing surface). It is a figure which compares. As is apparent from the figure, the difference between the area S1 of the portion indicated by the right-upward oblique line and the area S2 of the portion indicated by the right-downward oblique line in the figure is the difference between the wheel passing surface area of the guide protrusion 120 and the rotation of the guide protrusion 14. Since this is a difference from the wheel passing surface area, the wheel passing surface area of the guide projection 14 of this embodiment is smaller than the wheel passing surface area of the guide projection 120. Therefore, the mass corresponding to the reduced area can be reduced.

  FIG. 4 is a view for explaining the structure of the cored bar 10 in which the shape of the guide protrusion 14 is slightly changed. As shown in the figure, the guide projections 14-1 and 14-2 have a curved shape such that they are convex in a direction facing each other when viewed from the inner peripheral surface side of the crawler body.

  Since the guide protrusion 14 is formed in a curved shape in this manner, it is necessary in a shorter length region in the crawler circumferential direction as compared with the case where the wheel passing portion of the guide protrusion 14 is formed in a linear shape. A sufficient amount of overlap can be ensured. Therefore, the weight of the cored bar 10 can be further reduced by shortening the extension length of the guide protrusion 14 itself while maintaining the necessary overlap amount.

  Furthermore, as shown in FIG. 5, tapered tapered portions 22 that gradually decrease toward the tip end may be formed at both end portions 16 a in the circumferential direction of the crawler main body of the wheel passing portion 16 of the guide protrusion 14. .

  Thereby, it is possible to further reduce the impact of the transfer of the rolling wheels in the overlap portion O formed between the guide protrusions 14-1 or between the guide protrusions 14-2, and the core according to the present embodiment. The ride comfort of a vehicle equipped with a rubber crawler with gold can be further improved.

  In addition, this invention is not limited to the said embodiment, A various change is possible within the range of the summary of invention. For example, in the above embodiment, the wheel passing surface of the wheel passing portion 16 of the guide projection 14 is formed in a substantially linear shape, but the present invention is not limited to this, and the proximal end coupling portion of the conventional guide projection 120 is not limited to this. If the high-weight portion such as 120c is not formed, the wheel passing surface of the guide protrusion 14 may be formed in an elongated shape other than a straight line such as an ellipse.

DESCRIPTION OF SYMBOLS 10 Core metal 12 Core metal main body 14 Guide protrusion 16 Rolling wheel passage part 22 Tapered part O Overlap part

Claims (4)

A core provided with a pair of guide projections embedded in the entire circumferential direction of an endless crawler body at predetermined intervals, and having tip ends protruding at predetermined intervals on the inner peripheral surface side of the crawler main body as roller contact surfaces. In rubber crawler with gold,
The pair of guide protrusions are formed with an elongated roller passing surface, and the interval between the wheel passing surfaces of the guide protrusions is gradually narrowed continuously in one direction of the crawler circumferential direction. Is formed as
Each of the core bars is embedded so that the pair of guide protrusions overlap each other in the crawler width direction with the wheel passage surface of the pair of guide protrusions of the core metal adjacent to the front and rear in the crawler circumferential direction. Characteristic rubber crawler. The wheel passing surfaces of the pair of guide protrusions are
The rubber crawler according to claim 1, wherein the rubber crawler has a curved shape that protrudes toward the edge portions facing each other. On the wheel passing surfaces of the pair of guide protrusions,
The rubber crawler according to claim 1, wherein a tapered portion having a gradually narrowing width toward the tip is formed.   The angle formed by the extending direction of the rolling wheel passage surface of the guide protrusion and the crawler body circumferential direction is in a range of 5 ° to 25 °. Rubber crawler.

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