JP2006248390A - Split type core bar of rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for improving durability of a rubber crawler without using a steel cord by splitting the rubber crawler in a manner to be convenient for manufacture of the rubber crawler and delivery of the rubber crawler. <P>SOLUTION: In this core part, an engaging part to a sprocket is provided at a central part, and a protrusion from an inner periphery of a rubber crawler is formed across the engagement part. Also, a blade part extending in right and left directions is provided, and a closed opening is formed at the blade part seen from a plane view at an edge part A in the right and left directions, an edge part B in forward and backward directions, and an edge part C on the central side. The core bar is split into two parts in a horizontal direction at the center including the edge part A and the edge part C, and a connecting bolt hole is formed at the split edge parts A and C seen from the plan view, respectively. The core bar comprises a core bar base body 10 and a core bar body 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a core bar of a rubber crawler used for a traveling portion of a vehicle for agricultural work, civil engineering work, and construction machinery (hereinafter referred to as a vehicle).

  In the conventional rubber crawler structure used in a vehicle, a core metal that forms a traveling path of a wheel with a constant pitch in the longitudinal direction is embedded in rubber, and further surrounds the left and right wings of the core metal. In order to resist the tension applied to the rubber crawler, a row of steel cords is also embedded in the rubber. For example, the top surface of the protrusion formed on the core metal becomes the running surface of the wheel. However, the steel cord is a twist of relatively thin cord strands, which is inconvenient for handling at the manufacturing site, and further, the steel cord is caused by excessive tension during use. Cutting may occur.

  However, the present applicant has provided many rubber crawlers that do not use a steel cord formed by twisting fine wires as a tensile material. Patent Document 1 is given as an example of a rubber crawler that does not use a steel cord that has already been provided. This series of techniques is a rubber crawler in which a metal core is embedded at a constant pitch in the longitudinal direction of the rubber crawler. An opening is formed in the plan view in the left and right wing parts of the cored bar, and a connecting body having fitting parts on the front and rear is used, and the edge of the opening part of the adjacent cored bar is fitted to the connecting body. A rubber crawler using the connected body as a tensile material is provided.

JP 2004-001595 A

  The object of the present invention is to further improve such a proposed technique, and of course not to use a steel cord, but to improve the mandrel to be used and manufacture the rubber crawler itself. Therefore, it is possible to divide the rubber crawler so that it is convenient for transporting the rubber crawler, and as a result, a technique for improving the durability of the rubber crawler is provided.

  The gist of the present invention is that the center portion is an engagement portion with a sprocket, a protrusion protruding from the inner peripheral surface of the rubber crawler is formed with the center portion interposed therebetween, and further provided with a wing portion extending in the left-right direction. In the metal core in which a closed opening is formed in plan view at the edge A in the left-right direction, the edge B in the front-rear direction, and the edge C on the center side, the center including the edge A and the edge C The rubber crawler is composed of a cored bar base 10 and a cored bar base 20 in which the divided edge A and edge C are respectively formed with bolt holes for connection in plan view. This is a split cored bar.

  In the cored bar of the present invention, one complete cored bar is completed by combining the cored base bodies 10 and 20, and it is thereby possible to obtain a unit-type split type crawler. As a result, the rubber crawler can be partially replaced, and as a result, a technique for improving the durability of the rubber crawler is provided.

  Patent Document 2 discloses a technique in which a rubber crawler using a steel cord as a tension reinforcing member is divided. In such a rubber crawler split cored bar, it is necessary to fix the steel cord to the cored bar with a substantially uniform tension, which makes it difficult to manufacture. Furthermore, since the core metal substrate is integrated only by bolts, the durability of the rubber crawler is greatly affected by the strength of the bolts.

JP 7-277236 A

  The core of the rubber crawler of the present invention becomes a complete core by integrating the cores 10 and 20, but this is not simply integrated only by bolts, but on the contact surface in the pulling direction. The fitting concave and convex portions arranged at right angles to each other are formed, and by combining them, a drag corresponding to not only the tension but also the compressive force, the lateral displacement and the like is brought about.

  Hereinafter, the present invention will be described in more detail with reference to examples. FIG. 1 is a perspective view of a cored bar of the present invention when completed, FIGS. 2 to 5 show a cored bar base 10 of the cored bar at the time of division, and FIGS. 6 to 9 show a cored bar base 20. 2 is a top view of the core metal base 10, FIG. 3 is a front view thereof, 4 is a side view thereof, FIG. 5 is a cross-sectional view taken along line AA, and FIG. 7 is a front view thereof, FIG. 8 is a side view thereof, and FIG. 9 is a sectional view taken along line BB.

  In the figure, reference numeral 1 denotes an engagement portion with a sprocket, which is formed with protrusions 2 and 3 sandwiching this, and protrudes from the inner peripheral surface when the core metal is embedded in rubber. is there. The wing parts 4 and 5 extend in the left-right direction, and the wing parts 4 and 5 are provided with edge parts Aa and Ab in the left-right direction, edge parts Ba and Bb in the front-rear direction, and edge parts Ca and Cb on the center side. Thus, the closed opening 6 is formed in plan view.

  The core metal base 10 and the core metal base 20 are obtained by dividing the core metal in FIG. 1 into two parts, the protrusions 2 and 3 are divided and formed on the core metal base 10 side, and the engaging portion 1 is also the core metal. It is formed on the base 10 side. The dividing surface bisects the edges Aa and Ab in the left-right direction, and the recesses 7 are formed by notching the ends of the edges Aa and Ab. On the other hand, the core metal base 20 side is formed with the protrusions 2 and 3, the back side portion of the engaging portion 1 and the back sides of the left and right edges Aa and Ab, and the key-shaped convex portion that fits into the recess 7 a. 7b is formed.

  Then, each of the four edge portions Aa, Ab and Ca, Cb is respectively bored with a bolt hole 8 in a plan view, and when assembled as a core metal, a bolt (not shown) is inserted and screwed together with a nut. Is. That is, by fitting Aa, Ab and Ca, Cb, it is possible to resist pulling and compression, and by fitting Aa, Ab, lateral displacement can be prevented. Incidentally, D is a recess having a trapezoidal cross section, and a trapezoid Cb is fitted and integrated into a complete metal core.

  FIG. 10 shows cross-sectional ends at the edges Ba and Bb, and FIG. 11 shows cross-sectional ends at the edges Aa and Ab. In the figure, reference numeral 9 denotes a C-shaped connecting body, which includes fitting portions 9a and 9b. The fitting portions 9a and 9b of the connecting body 9 are connected as a whole by fitting the edge portions Ba and Bb of adjacent cored bars.

  The core metal base 10 and the core metal base 20 are connected to each other by a connecting body 9 and bolts and nuts to form an endless rubber track. The core 9 is pulled by the connecting body 9 when used. However, in the bonded metal core according to the present invention, the dent 7a and the convex part 7b are fitted at right angles to the tensile direction to ensure the tensile strength, and the rubber core is separated from the core metal part. It has become possible to be prevented.

  The cored bar of the present invention is one in which one complete cored bar is completed by combining the cored bases 10 and 20, and an endless rubber crawler can be obtained using this. By using the core metal base at the left and right ends, it becomes possible to obtain a unit-type split-type crawler, which is connected to complete a rubber crawler. In some cases, uneven wear or partial rubber chipping may occur. It is possible to replace only the part that has occurred, resulting in improved durability of the rubber crawler, and can be applied to all rubber crawlers using C-type or S-type couplings. It is.

FIG. 1 is a perspective view of the core bar of the present invention when completed. FIG. 2 is a top view of the core metal base 10. FIG. 3 is a front view of FIG. FIG. 4 is an enlarged side view of FIG. FIG. 5 is an enlarged sectional view taken along line AA of FIG. FIG. 6 is a top view of the cored bar base 20. FIG. 7 is a front view of FIG. FIG. 8 is an enlarged side view of FIG. FIG. 9 is an enlarged sectional view taken along line BB in FIG. FIG. 10 shows cross-sectional ends at the edges Ba and Bb in FIG. FIG. 11 shows cross-sectional ends at the edges Aa and Ab in FIG.

Explanation of symbols

1. Engagement part with sprocket,
2, 3 ... projection,
4, 5 ... Wings,
6 ... Closure opening,
7a: Recess,
7b ... convex part,
8. Bolt holes,
9. Linked body,
9a, 9b ... the fitting part of the connected body,
10, 20 ... cored base,
Aa, Ab ... Edges of the wings in the horizontal direction,
Ba, Bb ... front and rear edges of the wing,
Ca, Cb ... edge on the center side of the wing,
D: A depression with a trapezoidal cross section.

Claims (4)

  The center part is an engagement part with the sprocket, and a protrusion protruding from the inner peripheral surface of the rubber crawler is formed across this, and further provided with a wing part extending in the left-right direction, and the wing part has a left-right direction. In the core metal in which the closed opening is formed in a plan view at the edge A, the edge B in the front-rear direction, and the edge C on the center side, in the horizontal direction at the center including the edge A and the edge C A rubber core split-type core comprising a cored bar base 10 and a cored bar base 20 which are divided into two parts and in which the divided edge A and edge C are respectively formed with bolt holes for connection in plan view.   The split cored bar for a rubber crawler according to claim 1, wherein fitting irregularities are formed on the split surface of the edge A in the cored bases 10 and 20.   3. A split cored bar for a rubber crawler according to claim 1 or 2, wherein a concavity and convexity is formed on a split surface at the center of the cored bar bases 10 and 20.   4. A split cored bar for a rubber tracker according to any one of claims 1 to 3, wherein a protrusion protruding from the inner peripheral surface of the rubber tracker is provided only on one side of the cored bar base.

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