JPH06286675A - Core metal for elastic crawler - Google Patents

Abstract

PURPOSE:To increase the adhesion strength between a core metal blade part and a crawler body and improve rigidity of the crawler itself and durability. CONSTITUTION:Left and right blade parts 1A in pair are connected integrally by a connection part 1B at the center, and a core metal 1 for elastic crawler is embedded in an endless strip shaped crawler body 3, and a projection part 5 (or/and a recessed part) is formed over nearly the whole surface on the surface of the counter-grounded side of the blade part 1A, and the adhesion surface area is increased, and the relative shift in the lateral direction (or peripheral direction) between the core metal 1 and the crawler body 3 is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core bar for an elastic crawler which is embedded in an endless belt crawler body made of an elastic material such as rubber.

[0002]

2. Description of the Related Art Generally, an elastic crawler has an endless belt-shaped crawler main body made of an elastic material, and a cored bar extending in the widthwise direction of the main body and having guide projections on both sides in the widthwise central portion thereof is circumferentially spaced. While being embedded, a tensile body made of steel cord or the like extending in the circumferential direction is embedded, and the main body is provided with engagement holes for driving toothed wheels (sprocket) at predetermined intervals in the circumferential direction at the center in the width direction. A pair of left and right lugs are provided at regular intervals in the circumferential direction on the ground side of the main body (see, for example, Japanese Utility Model Publication No. 1-27505).

Conventionally, the core metal is integrally formed with a pair of left and right blades, a connecting portion for connecting the blades at the center, and a pair of left and right guide protrusions protruding to both sides of the connecting portion on the side opposite to the ground. The surface of the wing portion has a flat shape.

[0004]

By the way, since the surface of the conventional cored bar blade is flat, adhesion to the crawler body is not reliable, and the elastic crawler receives a force in front, rear, left and right during traveling. However, the rigidity in the circumferential (front-back) direction and the lateral (left-right) direction is low, and there is a problem in durability. The present invention has been made in view of the above situation, and an object thereof is to increase the adhesive strength between the core bar blade portion and the crawler body, and to improve the rigidity and durability of the crawler itself. An object is to provide a core bar for an elastic crawler.

[0005]

In order to achieve the above object, the present invention takes the following technical means. That is, according to the present invention, the pair of left and right wings are integrally connected by the central connecting portion, and extend in the width direction of the main body in the endless belt-shaped crawler main body made of an elastic material such as rubber and the main body circumference. A core bar for an elastic crawler that is embedded at a predetermined interval in the direction, characterized in that a projection or / and a recess are formed on substantially the entire surface of the blade section on the anti-ground side.

The present invention is also characterized in that the projection and the recess are ridges or grooves.

[0007]

According to the present invention, the surface area of the core metal blade portion is increased to improve the adhesiveness, and the crawler body is fitted into the space between the projections or the recesses, so that the core metal moves in the circumferential or lateral direction. Is suppressed, the adhesive strength is increased, the rigidity of the crawler in the circumferential direction or the lateral direction is increased, and the durability of the crawler is significantly improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an elastic crawler 2 in which a core metal 1 according to the first embodiment of the present invention shown in FIG. 2 is embedded. The elastic crawler 2 is an endless belt-shaped member made of substantially rubber having abrasion resistance and weather resistance as a whole. Of the crawler body 3, the widthwise reinforcement body embedded in the main body 3 and the tensile bar 4 for preventing expansion, such as the core metal 1 and steel cord, and a reinforcing material (not shown) such as canvas. ing.

The core metal 1 is formed by casting or forging a metal material. As shown in FIG. 2, a pair of left and right blades 1A extending in the width direction of the crawler body 3 are integrally connected by a connecting portion 1B. In addition, a pair of left and right guide protrusions 1C are provided on the anti-grounding side (inner peripheral side) at the end portion, that is, the central portion of the connecting portion 1B of each wing portion 1A. And are embedded in the circumferential direction at predetermined intervals.

Further, on the surface of the wing portion 1A of the core metal 1 on the side opposite to the ground, ridge-shaped projections 5 (or concave grooves) extending in the circumferential direction of the crawler body 3 are formed in parallel with each other. ing. Further, the guide protrusions 1C of the core metal 1 are provided so as to be displaced left and right (in the width direction of the crawler body 3) in the circumferential direction of the crawler body 3, and the top surface 6 thereof serves as a wheel passing surface. The flat surface is substantially parallel to the anti-grounding side surface (inner peripheral surface) of the crawler body 3 and has a zigzag shape.

The crawler body 3 is provided with a driving toothed wheel (sprocket) engaging hole 7 located in the center of the crawler body 3 in the widthwise direction between the connecting portions 1B of the core metal 1 and corresponding to the core metal 1 on the ground side. Then, a pair of lugs 8 distributed in the width direction is provided. The crawler main body 3 is also embedded and integrated between the protrusions 5 provided on the blade portion 1A of the core metal 1, and the core metal blade portion 1
The adhesion area with A is greatly increased.

According to the first embodiment described above, the contact area between the core metal blade portion 1A and the elastic material forming the crawler body 3 is increased, so that the adhesive strength is increased, and the protrusion 5 causes the crawler body 3 to be bonded to the crawler body 3. The relative movement is suppressed, the lateral rigidity of the crawler 2 is significantly increased, and the circumferential rigidity can also be improved. FIG. 3 shows a second embodiment of the present invention, which is different from the first embodiment in that a concave portion formed of a groove extending in the left-right direction (width of the crawler body 3) is formed on the surface of the core metal blade portion 1A on the side opposite to the ground. 9 is provided, and the guide protrusions 1C are provided symmetrically. The adhesive strength can be increased similarly to the first embodiment, and the circumferential rigidity of the crawler body 3 can be significantly increased and the lateral rigidity can be increased. Can be improved.

Incidentally, by forming a large number of protrusions by juxtaposing the projection 5 and the recess 9 shown in the first and second embodiments, the bonding surface area is further increased, and the relative movement in the circumferential and lateral directions is achieved. It is possible to significantly improve the rigidity in the circumferential direction and the lateral direction by improving the quality and durability of the elastic crawler 2. Further, the core metal of the first embodiment and the core metal of the second embodiment can be embedded in the main body 3 alternately in the circumferential direction.

The present invention is not limited to the above-mentioned embodiment, for example, the shapes of the projections and the recesses can be changed as appropriate, and the projections are formed on both the ground side and the anti-ground side of the core metal blade 1A. Or / and a concave portion can be provided, and it can also be adopted for a cored bar having no guide protrusion.

[0015]

As described above, according to the present invention, a pair of left and right blades are integrally connected by a central connecting portion, and the endless belt-shaped crawler main body made of an elastic material such as rubber is provided inside the main body. A core bar for an elastic crawler which extends in the width direction and is embedded at a predetermined interval in the circumferential direction of the main body, and a protrusion or / and a recess is formed on substantially the entire surface of the blade portion on the anti-ground side. Therefore, the adhesion surface area between the cored bar and the crawler body or the tensile body is greatly increased, the adhesion strength is increased, and the rigidity of the crawler in the circumferential direction and the lateral (width) direction is increased. In addition, the quality and durability of the crawler can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of an elastic crawler in which a first embodiment of the present invention is embedded.

FIG. 2 is a perspective view showing a first embodiment of the present invention.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 core metal 1A wing part 1B connecting part 1C guide protrusion 2 elastic crawler 3 crawler body 5 protrusion 9 recess

Claims (2)

[Claims] 1. A pair of left and right wing portions are integrally connected by a central connecting portion, and extend in the width direction of the main body in a crawler main body made of an elastic material such as rubber and in the circumferential direction of the main body. A core bar for an elastic crawler which is embedded in the wing at predetermined intervals, wherein a protrusion or / and a recess is formed on substantially the entire surface of the blade portion on the side opposite to the ground. . 2. The core bar for an elastic crawler according to claim 1, wherein the protrusion and the recess are ridges or grooves.