JP2007176208A - Elastic crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the durability of an elastic crawler having a core long in the width direction of the crawler on a crawler body consisting of an elastic body by sufficiently preventing generation of cracks of the crawler body. <P>SOLUTION: A spherical part 6 which is partially projected from an outer edge g1 in its crawler width direction is provided on a core 3 embedded in a crawler body 2 to mitigate the stress concentration in the crawler body 2 in a vicinity of the outer edge g1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an elastic crawler belt used for various crawler type traveling devices.

Conventionally, for example, an endless elastic crawler belt is known as an elastic crawler belt mounted on a crawler traveling device used in agricultural and forestry working vehicles, construction vehicles, and the like. When the elastic crawler rides on the curb on the road and a part of the crawler body deforms in the thickness direction, the crawler belt body is sandwiched between the crawler width direction outer edge of the buried core metal and the curb, and the crawler belt Stress concentration may occur in the main body and cracks may occur. Therefore, in the elastic crawler belt described in Patent Document 1, the deformation of the crawler belt body toward the inner peripheral side in the thickness direction is reduced by curving the core metal toward the inner peripheral side and providing a built-up portion at the tip thereof. The crack generation is suppressed.
JP-A-11-268673

However, in the state in which the crawler type traveling device rides on a protrusion such as a stone or the curb and moves forward and backward, in the elastic crawler of Patent Document 1, the crawler circumferential straight portion of the overlaying portion of the core metal and the crawler belt main body There is a problem in that stress concentrates on the boundary portion and a shift is likely to occur, whereby the crawler belt body is torn and a crack is generated. In addition, when this elastic crawler belt is pressed against the wall surface or curbstone and the crawler belt body is warped back to the ground side, there is also a problem that cracks are likely to occur because the cored bar is curved toward the inner peripheral side. As described above, the elastic crawler belt cannot sufficiently suppress the occurrence of cracks in the crawler belt main body, which affects the durability.
The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an elastic crawler belt having improved durability by sufficiently preventing the occurrence of cracks in the crawler belt body.

In order to achieve the above object, the present invention takes the following technical means.
That is, the present invention relates to an elastic crawler belt in which a long metal core is provided in a crawler belt width direction on a crawler belt main body made of a rubber elastic body, and the metal core partially protrudes from an outer edge of the crawler belt width direction. A spherical portion that is formed in a substantially spherical shape that relieves stress concentration of the crawler belt main body in the vicinity of the outer edge is provided.
With the configuration of the elastic crawler belt of the present invention, it is possible to relieve the stress generated when the crawler belt main body is deformed in the vicinity of the outer edge in the crawler belt width direction of the core metal at the spherical portion. Moreover, since the stress acting from multiple directions can be dispersed by the spherical surface of the spherical portion, the stress concentration in the vicinity of the outer edge of the metal core can be alleviated no matter how the crawler belt body is deformed.
Therefore, even when the crawler type traveling device rides on a protrusion such as a stone or a curb and advances or retreats, or when the crawler body is pressed against the wall surface and sleds, the concentration of stress on the crawler belt body is alleviated. Furthermore, the presence of the spherical portion increases the bonding area between the core metal and the crawler belt body and improves their adhesion strength. Is unlikely to occur. The cracks of the crawler belt main body can be prevented by the action as described above.

In the present invention, preferably, the spherical portion is provided at both corners of the outer end edge, and a part of the spherical portion protrudes outward in the crawler belt width direction from the outer end edge.
In this case, the effect of relaxing the stress concentration of the crawler belt main body in the vicinity of the outer edge of the metal core can be enhanced.

As described above, when the spherical portion is provided at both corners of the outer end edge of the cored bar, it is preferable that the outer end edge extending between the spherical portions provided at both corners is curved inward in the crawler belt width direction.
In this case, the adhesion area between the cored bar and the crawler belt main body can be further increased, and at the same time, the stress concentration of the crawler belt main body in the vicinity of the outer edge across the spherical portions can be reduced.

Moreover, it is preferable that the corner part which extends from the spherical part provided in the said both corners to the said outer end edge is formed in round shape.
When the crawler belt body is pulled in the vicinity of the corner portion that extends from the spherical portion provided at both corners of the metal core to the outer edge of the metal core, stress concentration of the crawler belt body tends to occur at a part of the corner portion, The stress concentration can be relieved by making the corner portion round.

  Furthermore, a neck portion extending from the outer edge to the spherical portion may be formed at the base of the spherical portion. In this case, the adhesion area between the cored bar and the crawler belt main body can be further increased, and at the same time, the stress concentration of the crawler belt main body in the vicinity of the outer edge across the spherical portions can be reduced.

In the present invention, the spherical portion may be provided on the inner peripheral surface side of the cored bar.
If the spherical part is provided on the inner peripheral surface side of the core bar, when the elastic crawler belt is pressed against the wall surface and the crawler belt body is warped in reverse, the stress concentration of the crawler belt body on the inner peripheral surface side of the core bar is effectively reduced. Can be relaxed.

  As described above, according to the present invention, since the multi-directional stress acting when the crawler belt main body is deformed can be relaxed by the spherical portion in the vicinity of the outer edge in the crawler belt width direction of the core metal, Crack generation is sufficiently prevented, and durability can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of an elastic crawler belt according to the present invention. The elastic crawler belt of the present embodiment is used as an endless elastic crawler 1 for a crawler type traveling device (not shown) used for agricultural and forestry working vehicles, construction vehicles, and the like. A wheel group composed of drive sprockets and idlers provided before and after the airframe, and a plurality of wheels arranged between these drive sprockets and idlers, and the elastic crawler 1 wound around these wheel groups It consists of and.

  The elastic crawler 1 includes a crawler belt body 2 made of an endless belt-like elastic body, a core metal 3 embedded in the crawler belt body 2 at intervals in the crawler belt circumferential direction, a lug group made up of a plurality of lugs 4, and a crawler belt And a tensile body 5 embedded along the circumferential direction. Among these, the crawler belt main body 2 is formed in an endless belt shape made of a rubber elastic material, and a plurality of lugs 4 are integrally projected on the outer peripheral surface at a predetermined interval in the crawler belt circumferential direction. Two tensile bodies 5 made of steel cord or the like that regulate the extension of the crawler belt body 2 circulate endlessly along the entire circumference of the crawler belt in the crawler belt ground side of the core metal 3. The metal core 3 is formed long in the crawler belt width direction, and protrudes from the base portion 31 located at the center thereof, both wing portions 32 extending from the base portion 31 to the left and right in the crawler belt width direction, and the inner peripheral surface n of the crawler belt body. And a pair of left and right guide protrusions 33.

  As shown in FIGS. 1 and 2 (a) and 2 (b), spherical portions 6 are provided at both corners of the crawler belt width direction outer edge g1 (hereinafter referred to as a core metal outer edge) of the wing portion 32, respectively. ing. Each spherical portion 6 is formed in a substantially spherical shape, and the crest thickness direction upper top portion u protrudes from the upper surface 32j of the wing portion 32, and the crawler belt thickness direction lower top portion s protrudes from the lower surface 32k of the wing portion 32. Has been. Moreover, the crawler belt circumferential direction outer edge g of each spherical part 6 protrudes from the crawler belt circumferential direction edge 32h of the wing part 32, and the position of the crawler belt width direction outer edge t is matched with the core metal outer edge g1. Further, the spherical diameter of the spherical portion 6 is about 5 mm. The diameter of the spherical portion 6 is preferably 5 mm or more.

  Conventionally, when the crawler type traveling device rides on the curb and the crawler belt body is deformed, stress tends to concentrate on the crawler belt body 2 in the vicinity of the outer end edge g1 of the metal core. For example, stress acting from multiple directions on the spherical surface of the spherical portion 6 can be dispersed, so that stress concentration in the vicinity of the outer end edge g1 of the metal core can be alleviated no matter how the crawler belt body 2 is deformed. Accordingly, even when the crawler type traveling device is moving forward and backward on a protrusion such as a stone or a curb, or when the crawler belt body 2 is pressed against the wall surface and sled backwards, the crawler belt in the vicinity of the outer edge g1 of the metal core. The stress concentration of the main body 2 is alleviated. Further, the presence of the spherical portion 6 increases the bonding area between the core metal 3 and the crawler belt main body 2 and improves the adhesive strength thereof. It is difficult for excessive stress to occur in the main body 2. The occurrence of cracks in the crawler belt main body 2 is prevented by the action as described above, and the durability of the elastic crawler 1 can be improved.

  3 and 4 (a) and 4 (b) show a first modification of the cored bar according to the present invention. The core bar 7 is different from the core bar 3 embedded in the elastic crawler 1 of the above embodiment in that the spherical portion 8 has a slightly larger sphere diameter of about 6 mm, and the outer width t2 of the spherical portion 8 in the crawler belt width direction is the core. This is a point protruding outward in the crawler belt width direction from the gold outer edge g1. In this case, the effect of relaxing the stress concentration of the crawler belt body 2 in the vicinity of the outer end edge g1 of the metal core is enhanced.

  FIG. 5 shows a second modification of the cored bar according to the present invention. The core bar 9 is different from the core bar 7 of the first modification shown in FIGS. 3 and 4 in that the outer end edge g1 of the core bar extending between the spherical portions 10 provided at both corners is curved inward in the crawler belt width direction. It is a point. In this case, the adhesion area between the cored bar 3 and the crawler belt body 2 is further increased, and the effect of reducing the deviation between the cored bar 3 and the crawler belt body 2 can be enhanced. At the same time, the stress concentration of the crawler belt body 2 in the vicinity of the outer end edge g1 of the core bar between the spherical portions 10 can be reduced.

  FIG. 6 shows a third modification of the cored bar according to the present invention. The core metal 11 is different from the core metal 7 of the first modification shown in FIGS. 3 and 4 in that the core metal 11 extends from the outer end edge g1 of the core metal to the spherical part 12 at the base of the spherical part 12 provided at both corners. The neck portion 13 is formed, and the corner portion 14 (the inner edge of the neck portion 13) that extends from each spherical portion 11 to the outer end edge g1 of the metal core is formed in a round shape. In this case, the adhesion area between the core metal 3 and the crawler belt body 2 can be further increased by the neck portion 13, and the crawler belt body 2 is formed in the vicinity of the corner portion 14 because the corner portion 14 is rounded. When pulled, the stress concentration in the crawler belt body 2 can be relaxed.

  FIG. 7 shows a fourth modification of the cored bar according to the present invention. The core metal 15 is provided with only one spherical portion 16 on the inner surface side of the outer end portion 15g of the core metal. If the spherical portion 16 is provided at such a position, for example, when the elastic crawler 1 is pressed against the wall surface and the crawler belt body 2 is warped backward to the grounding side, the crawler belt body 2 on the inner peripheral surface side of the core metal 15 is provided. The stress concentration can be effectively reduced.

  The present invention is not limited to the above-described embodiment, and the above-described cored bars are illustrated and not restrictive. For example, three or more spherical portions may be provided on the outer end edge of the core metal, or the spherical portions may be provided only on the outer surface side of the outer end edge of the core metal. In addition, the shapes of the crawler belt main body, lugs, base of the metal core, guide protrusions and the like can be changed as appropriate. Although an elastic crawler has been exemplified as the elastic crawler belt, the present invention can also be applied to an elastic shoe for a crawler attached to an endlessly connected crawler link. The elastic shoe used in this type of elastic crawler includes an elastic pad portion and a core bar embedded in the elastic pad portion, and the spherical portion exemplified above is provided on the outer edge in the crawler belt width direction of the core bar. Thus, it is possible to prevent cracking of the elastic pad.

It is a crawler belt width direction sectional view of an elastic crawler. (A) is a top view of a metal core, (b) is a bottom view. It is a crawler belt width direction sectional view concerning the 1st modification of a metal core. (A) is a top view of the metal core which concerns on a 1st modification, (b) is a bottom view. It is a principal part top view which concerns on the 2nd modification of a metal core. It is a principal part top view which concerns on the 3rd modification of a metal core. (A) is a principal part top view which concerns on the 4th modification of a metal core, (b) is a side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Crawler belt main body 3 Core metal 6 Spherical part 13 Neck part g1 Core metal outer edge

Claims (6)

In the elastic crawler belt in which a long metal core is provided in the crawler belt width direction on the crawler belt body made of an elastic body,
The cored bar is provided with a spherical portion formed in a substantially spherical shape that partially protrudes from the outer edge of the crawler belt width direction and relaxes the stress concentration of the crawler belt main body in the vicinity of the outer edge. Elastic track.   The elastic crawler belt according to claim 1, wherein the spherical portion is provided at both corners of the outer end edge, and a part of the spherical portion protrudes outward in the crawler width direction from the outer end edge.   The elastic crawler belt according to claim 2, wherein the outer edge extending between the spherical portions provided at both corners is curved inward in the crawler belt width direction.   The elastic crawler belt according to claim 2 or 3, wherein a corner portion extending from the spherical portion provided at both corners to the outer end edge is formed in a round shape.   The elastic crawler belt according to any one of claims 1 to 4, wherein a neck portion extending from the outer edge to the spherical portion is formed at a base of the spherical portion.   The elastic crawler belt according to claim 1, wherein the spherical portion is provided on an inner peripheral surface side of the cored bar.

Images