JPH11348848A - Mandrel for rubber crawler and rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a mandrel lightweight while reinforcing it by forming thick sections upheaved in the opposite direction to lugs at the junctions of a pair of right and left lugs and blade sections respectively, and forming the blade sections on the right and left of the thick sections into thin sections having parallel upper and lower faces. SOLUTION: Each of mandrels 10 buried in a rubber belt 15 used as an endless belt at intervals in the belt longitudinal direction is provided with a pair of right and left lugs 12R, 12L upheaved into an angular shape and a pair of right and left blade sections 13R, 13L extending outward from the base sections of the lugs 12R, 12L into a flat plate shape, and a bridge section 14 connecting the lugs 12R, 12L is used as the coupling section of a drive sprocket wheel. Thick sections 16R, 16L upheaved in the opposite direction to the lugs 12R, 12L are formed at the junctions of the base sections of the lugs 12R, 12L and a pair of the right and left blade sections 13R, 13L respectively. Thin sections 17R, 17L having parallel upper and lower faces are formed on the blade sections 13R, 13L on the right and left of the thick sections 16R, 16L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler core and a rubber crawler.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are sectional views of a typical rubber crawler core and a right half of a conventional rubber crawler (the left half from the center OO is symmetrical). ). 4 and 5, a pair of left and right projections 1A and a pair of left and right wings 1 extending outward from the base of the projection 1A.
B are arranged in a rubber crawler belt 2 at intervals in the longitudinal direction of the belt, and left and right wing portions 1 of the core bar 1 are provided.
A tensile member 3 in the longitudinal direction of the belt is embedded in the crawler belt 2 on the grounding surface side of B, and the rubber crawler belt 4 is formed by wrapping the crawler belt 2 around the driving wheel and the driven wheel with the endless shape. , 5 in the drawing indicates a ground lug.

The rubber crawler 4 shown in FIG. 4 has a rolling wheel passing surface 2A having a thickness t1, t2 (t1 <t2) formed on the inner peripheral surface corresponding to the wing portion 1B, and is shown in FIG. The rubber track 4 has a rolling wheel passing surface 2A having the same thickness t1 and t2.
(See Japanese Patent Application Laid-Open No. 10-24874).

[0004]

The rubber crawler 4 shown in FIG. 4 has an economic disadvantage associated with an increase in the amount of rubber used because the total thickness T of the rubber crawler belt 2 is too large, and is vulcanized. In addition to the economic disadvantage associated with the increase in the vulcanization time in the case of not only reducing the productivity but also causing
Is a rail shape, so that there is a problem that bending resistance at a portion where a wheel body (a driving wheel, a driven wheel, or the like) is wound increases, and a weight becomes a problem, resulting in horsepower loss.

In the rubber track 4 shown in FIG. 5, since the thickness of the crawler belt 2 can be made thinner than that of the crawler 4 shown in FIG. 4, it is not possible to solve the above-mentioned problems of the crawler 4 shown in FIG. However, there is a problem in that the rolling wheel 6 can adopt only a special form in which the outer peripheral surface is an inclined surface, and lacks versatility. An object of the present invention is to provide a cored bar and a rubber crawler that have solved the above-mentioned problems.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a rubber crawler core having a pair of left and right projections and a pair of left and right wings extending outward from the base of the projections. The following technical measures have been taken: That is, the core metal for a rubber crawler according to the present invention is formed with a thick portion protruding in the direction opposite to the projection at each of the connecting portions of the bases of the left and right pairs of projections and the pair of left and right wings. The left and right wing portions of the portion are formed as thin portions having upper and lower surfaces parallel to each other (claim 1).

By adopting such a configuration,
The connection between the left and right pair of projections and the left and right pair of wings could be reinforced by the thick portion. In particular, by reinforcing the thick part by raising it in the direction opposite to the protrusion, and by reinforcing the thick part in the same direction as the protrusion, it is possible to prevent the versatility of the rolling wheel passage surface from lacking. It is doing. Further, according to the present invention, a core metal having a pair of left and right projections and a pair of left and right wings extending outward from the base of the projections is arranged in a rubber crawler belt at intervals in the belt longitudinal direction. In the rubber track, in which a tensile member in the longitudinal direction of the belt is embedded in a rubber crawler on the ground contact surface side of the left and right wing portions of the core metal, the following technical means for achieving the above object Have taken.

That is, the rubber track according to the present invention comprises:
At each of the connecting portions of the base of the pair of left and right projections and the pair of wings of the left and right pair, a thick portion raised in the direction opposite to the projection is formed,
The left and right wings of the thick portion are formed in a thin portion having upper and lower surfaces parallel to each other, and a tensile member is disposed facing the contact surface side of the thin portion. (Claim 2).

By adopting such a configuration,
The amount of rubber used is reduced and promised to be lighter, not only to reduce horsepower loss and shorten vulcanization time, but also to eliminate the local weakness of the core metal, and to increase durability The lateral displacement of the upholstery can also be suppressed. Further, according to the present invention, the rubber thick part is raised on the ground surface of the rubber crawler belt corresponding to the pair of left and right thick parts described above, so that the core thick part is covered with the rubber thick part. As a result, protection from so-called rubber cutting and rubber chipping was achieved (claim 3).

Further, in the present invention, the tensile member can be arranged inside and outside the thick pair of left and right parts and on the side of the grounding surface (claim 4). The upholstery is a cord that is driven with an interval in the width direction, and the number of inner cords in the thick part is smaller than the outer cord, so that the number of Insufficient number of shots could be avoided (claim 5).

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a metal core 10 according to the present invention.
1 and 2 show a first embodiment of a rubber crawler 11 using the cored bar 10. The cored bar 10 is a pair of left and right protrusions 12L and 12R protruding in a square shape and a flat plate outwardly from the base of the protrusions 12L and 12R. Right and left pair of wings 13L,
13R, which is formed by casting, hard resin, forging, or the like, and connects the pair of left and right protrusions 12L, 12R, is a bridging portion of a driving sprocket wheel (not shown).

The core metal 10 is buried (arranged) in the endless belt-shaped rubber crawler belt 15 with an interval in the longitudinal direction of the belt, and in this arranged state, a pair of left and right protrusions 12L, 12R is formed. Raising from the inner peripheral surface (anti-ground contact surface) side of the crawler belt 15 prevents derailment from a wheel body or the like, and substantially the pair of left and right wings 1
3L and 13R are embedded in rubber, and the rubber (made of rubber) means rubber for crawler.

At the connecting portions between the bases of the left and right pairs of projections 12L and 12R and the left and right pairs of wings 13L and 13R, respectively, thick portions 16L and 16L protruding in the opposite direction to the projections 12L and 12R.
16R, the left and right wing portions 13L and 13R of the thick portions 16L and 16R are formed as thin portions 17L and 17R whose upper and lower surfaces are parallel to each other. The thick portions 16L and 16R are raised in a flat shape, so that the section modulus of the connecting portion in the width direction, particularly the portion indicated by the symbol R, is gradually reduced from the projection to the wing portion.

On the grounding surface side of the pair of left and right wing portions 13L, 13R, tensile members 18L, 18R in the longitudinal direction of the band are embedded, and the tensile members are brought close to the thin portions 17L, 17R. The lateral displacement is substantially prevented by the thick portions 16L and 16R. Roller rolling surfaces 19L and 19R that are substantially parallel to the upper surfaces of the wing portions 13L and 13R are formed on the inner peripheral surface (anti-ground contact surface) side of the pair of left and right wing portions 13L and 13R so that the crawler belt 15 has It is stretched over the entire circumference, where the track 1
5 prevents the thickness T from being increased.

The tensile members 18L and 18R are formed by arranging steel cords, fiber cords and the like in the width direction, and interpose a canvas or the like (not shown) between the cord driving portion (embedding portion) and the wing portion. You can also. FIGS. 2 and 3 show another embodiment of the rubber crawler 11. In FIG. 2, a rubber thick portion 20L is formed flatly on the grounding surface side corresponding to the thick portion 16L of the metal core 10. doing.

In FIG. 2 and FIG. 3, the number of cords to be inserted into the tensile member 18L is set to, for example, four on the inner side and eight on the outer side inside and outside the thick portion 16L. In this way, the number of cords to be inserted can be increased, and the other configuration is common to the configuration and operation shown with reference to FIG. 1. Therefore, common parts are denoted by common reference numerals. FIG. 2 and FIG. 3 show only one of the crawler centers XX.
Of course, it is symmetrical with X.

In FIGS. 1 to 3, a lug 21 made of the same material as that of the crawler belt 15 is integrally formed on the grounding surface side of the crawler belt 15. Or rugs arranged in a zigzag pattern on the left and right. Further, in FIG. 2, it is desirable to connect lugs 21 adjacent in the circumferential direction by a thick rubber portion 20L, and in FIGS.
The lug 21 and the lug 21 can be arranged on the same projection plane.

[0018]

The present invention has been described above. The core metal can be made durable by reinforcing it between the projections and the wings while securing versatility, and this core metal is employed. The rubber crawler can be reduced in weight and vulcanization time can be shortened, but can have high durability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a right half sectional view showing a second embodiment of the present invention.

FIG. 3 is a sectional view of a right half showing a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a right half showing a first conventional example.

FIG. 5 is a sectional view of the right half showing a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Core metal 11 Rubber track 12L, 12R Left and right protrusion 13L, 13R Wing part 16L, 16R Thick part 17L, 17R Thin part 18L, 18R Tensile body

Claims (5)

[Claims] 1. A rubber crawler core bar having a pair of left and right projections and a pair of left and right wings extending outward from the base of the projections, wherein the base of the pair of left and right projections and the pair of left and right wings are connected. A thick part protruding in the opposite direction to the projection is formed in each of the parts,
A core metal for a rubber track, wherein the left and right wing portions of the thick portion are formed as thin portions having upper and lower surfaces parallel to each other. 2. A rubber core having a pair of left and right projections and a pair of left and right wings extending outward from the base of the projections is arranged in a row in a rubber crawler belt at intervals in the belt longitudinal direction. A rubber crawler in which a tensile member in the longitudinal direction of the band is embedded in a rubber crawler belt on the grounding surface side of the left and right wing portions of the core metal, wherein a base portion of the left and right pair of projections and a left and right pair of wing portions A thick part protruding in the direction opposite to the projection is formed at each of the connecting portions,
The left and right wings of the thick portion are formed in a thin portion having upper and lower surfaces parallel to each other, and a tensile member is disposed facing the contact surface side of the thin portion. And a rubber crawler. 3. The rubber crawler according to claim 2, wherein the rubber crawler belt is formed so as to protrude on the rubber thick part on the ground contact surface of the rubber crawler belt corresponding to the pair of left and right thick parts. 4. The rubber crawler according to claim 2, wherein a tensile member is disposed inside / outside the pair of left and right thick portions and on the side of the grounding surface. 5. The tensile member is a cord that is driven with an interval in the band width direction, and the number of inner cords in the thick portion is smaller than that of the outer cord. The rubber crawler according to claim 4, wherein: