JPH07246962A - Elastic crawler - Google Patents

Abstract

PURPOSE:To prevent local bending of a tension member embedded in a crawler body by relieving bending of front and rear parts in the crawler body lengthwise direction of core metals, and mainly considering reducing the lowering of durability caused by bending fatigue in an elastic crawler. CONSTITUTION:In an elastic crawler where width directional core metals 9 are arranged at specific intervals in the circumferential direction in an endless belt-like crawler body composed of an elastic material, reinforcing bodies 10 are arranged in front and rear in the crawler body circumferential direction of the core metals 9 in the crawler body, and rigidity of these parts is enhanced. A tension member 11 is formed in a gentle shape in front and in rear in the crawler body circumferential direction of the core metals 9 by the reinforcing bodies 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to agricultural machinery, construction machinery,
The present invention relates to an elastic crawler used for traveling devices such as various transport vehicles and snow vehicles.

[0002]

2. Description of the Related Art Conventionally, as an elastic crawler, a crawler main body is formed of an elastic material such as rubber into an endless belt shape, and a core metal in the width direction made of a hard material such as metal is circumferentially spaced in the crawler main body. In some cases, a tensile body made of steel cord or the like, which is endless in the circumferential direction, is also embedded. Further, guide protrusions for preventing wheel removal are provided on the inner peripheral surface side of the crawler body, and lugs are provided on the ground contact surface side at predetermined intervals in the circumferential direction.

[0003]

In the above-mentioned conventional one, the widthwise cored bars are embedded in the crawler body made of an elastic material at intervals in the circumferential direction. When the vehicle is used while traveling over a plurality of wheels, as shown in FIG. 12, the crawler main body 23 of the core bar 22 is wound around the wheel 21 as shown in FIG.
The front and rear portions C in the circumferential direction are bent in a V shape (hereinafter, the bent portion C
To say).

The repetitive load due to bending acts on the bent portion C of the crawler body 23 to cause fatigue of the tensile member 24 embedded in the crawler body 23, and at the same time, the crawler body at the bent portion C. 23, the adhesive strength between the core metal 23 and the cored bar 22 or the tensile member 24 is deteriorated to accelerate the invasion of peeling, external damage, etc., which has been a problem in terms of durability.

Further, in the vulcanization process in which the elastic material of the crawler body 23, the cored bar 22, and the tensile body 24 are placed in a mold and heated and pressed, the elastic material of the crawler body 23 is the mold. As it moves to every corner, the tensile body 24 becomes in a state along the core metal 22 as shown in FIG.
The corner of No. 2 is sharply bent. Therefore, when a ground load is applied, stress concentrates on the bent portion D of the tensile body 24, causing fatigue of the tensile body 24 at the bent portion D, and at the same time, the crawler body in the bent portion D and in the vicinity thereof. This causes deterioration of the adhesive force between the tension member 23 and the tension member 24.

In view of the above problems, the present invention intends to alleviate the bending of the core metal in the wheel winding portion in the front and rear portions in the circumferential direction of the crawler body, and reduce the deterioration in durability due to the bending fatigue. The main purpose is to alleviate abrupt bending of a circumferential reinforcing member such as a tensile body, reduce fatigue due to the bending, and prevent deterioration of durability.

[0007]

[Means for Solving the Problems] The technical means according to claim 1 of the present invention has been devised to achieve the above object.
In an elastic crawler in which a widthwise cored bar 9 is provided at a predetermined interval in the circumferential direction in an endless belt-shaped crawler main body 5 made of an elastic material, the cored bar 9 in the crawler main body 5 extends in the circumferential direction. Reinforcing body 10 on at least one side before and after
There is a point.

The technical means described in claim 2 is
In the endless belt-shaped crawler body 5 made of an elastic material, widthwise cored bars 9 are provided at predetermined intervals in the circumferential direction, and
Circumferential reinforcing members 11 and 12 extending in the circumferential direction of the crawler body 5
In the elastic crawler, the reinforcing member is provided on at least one of the front and rear sides of the core metal 9 in the crawler body 5 in the circumferential direction of the crawler body 5 so that the circumferential reinforcing members 11 and 12 have a gentle shape in the portion. 10 is provided.

[0009]

[Function] The crawler body 5 of the core metal 9 in the crawler body 5
By the reinforcement body 10 provided on at least one of the front and rear sides in the circumferential direction, the rigidity of the portion is increased, and the bending of the front and rear portions in the circumferential direction of the cored bar 9 of the crawler body 5 is relaxed in the portion wound around the wheel. As a result, fatigue of the tensile body provided inside the crawler body 5, deterioration of the adhesive force between the tensile body and the core metal or between the crawler body 5 and the core metal 9 and the like are reduced.

Further, by the reinforcing member 10, the circumferential reinforcing members 11 and 12 have a gentle shape in the circumferential front and rear portions of the cored bar 9 of the crawler body 5, so that the circumferential reinforcing member 1 is provided.
The bending of the front and rear portions in the circumferential direction of the core metals 1 and 12 is relieved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment, and in FIG.
Reference numeral 1 denotes a tire-driven crawler traveling device, which is mainly configured by, for example, mounting an elastic crawler 4 between a rear wheel (driving wheel) 2 of a light truck and an idler wheel 3 arranged in front thereof. It

As shown in FIGS. 1 to 4, the elastic crawler 4 is provided with an endless crawler main body 5 made of an elastic material such as rubber, and a lug 6 is provided on the grounding surface (outer peripheral surface) side of the crawler main body 5. Are integrally formed at a predetermined interval in the circumferential direction,
On the inner peripheral surface side, a pair of left and right guide protrusions 7 and 8 located on both the left and right sides of the wheels 2 and 3 for preventing the wheels 2 and 3 from coming off are integrally formed at predetermined intervals in the circumferential direction. There is.

A widthwise cored bar 9 made of a hard material such as a forged product, a casting, or a hard resin is embedded in the crawler body 5 at predetermined intervals in the circumferential direction. The guide projections 7 and 8 are arranged at positions corresponding to the projections 7 and 8 and are embedded in the guide projections 7 and 8. The projections 9 and 8 are connected to the left and right projections 9a.

Further, in the crawler body 5, each core metal 9
In the front and rear of the crawler body 5 in the circumferential direction, a reinforcing body 10 having a substantially triangular cross section and extending in the width direction of the crawler body 5 of the connecting portion 9b of the cored bar 9 is embedded. This reinforcing body 10 is made of rubber,
It is made of an elastic material such as resin and has a higher rigidity (hardness) than the elastic material of the crawler body 5. Therefore, in the winding portion of the wheels 2 and 3, each core metal 9
Although the front and rear portions of the crawler body 5 in the circumferential direction tend to bend, the bending of the front and rear portions of the crawler body 5 in the circumferential direction is relieved by the reinforcing body 10.

The reinforcing body 10 is in the shape of a right-angled triangle with the crawler main body grounding surface side being a hypotenuse, and the hypotenuse portion 10a of the crawler main body 5 is wound around the wheels 2 and 3 at the wheel 2 side. , 3 are curved (elastically deformed) along the outer circumference, and are preferably formed in an arc shape corresponding to the outer shape of the wheels 2, 3. The reinforcing body 10 is not limited to have a triangular cross-section, but A (thickness of the reinforcing body 10 on the side opposite the core metal 9) <B (thickness of the reinforcing body 10 on the side of the core metal 9). Is preferred.

In the crawler body 5, a tension member (circumferential reinforcing member) 11 is formed by arranging a large number of endless steel cords in the circumferential direction of the crawler body 5 in the width direction of the crawler body 5.
Is buried. The tensile body 11 is made of a core metal 9
Further, since the reinforcing body 10 is disposed on the outer circumferential side of the crawler body with respect to the reinforcing body 10, and the reinforcing body 10 is provided at the front and rear portions of the cored bar 9 in the circumferential direction of the crawler body 5, the tensile body 11 includes the cored bar and the reinforcing body 10. In the portion where is embedded, a comparatively gentle shape is formed along the hypotenuse portion 10a of the reinforcing body 10, and local bending is relieved.

If the reinforcing body 10 is a triangular shape in which the hypotenuse part 10a on the ground contact surface side is formed in an arc shape corresponding to the outer peripheral shape of the wheels 2 and 3 as shown in FIG. 1
0 may be formed of a hard resin or a metal such as aluminum. If the reinforcing body 10 is made of an elastic material, 0 may not have a triangular shape, and A = B (square shape) may be used. This is because the elastic body 11 does not sharply bend along the corners in the vulcanization step even if it has a rectangular shape.

5 to 11 show another embodiment, and FIG.
Shows that the tensile body 11 is arranged on the inner peripheral side of the crawler body with respect to the core metal 9 and the reinforcing body 10, and the sectional shape of the reinforcing body 10 is formed into a substantially isosceles triangular shape. The tensile body 11 in the above-described embodiment is arranged on the inner circumference side of the crawler body with respect to the core metal 9 and the reinforcing body 10, and is endless in the circumferential direction of the crawler body 5 on the outer circumference side of the core metal 9 and the reinforcing body 10. The protective member (circumferential reinforcing member) 12 is arranged, and the protective member 12 is obtained by bias cutting a fabric mainly composed of a cord material such as rayon, nylon, polyester, steel, and Kevlar. It consists of an endless strip of ply.

FIG. 8 shows another embodiment shown in FIG. 5 in which the protective member 12 is arranged on the inner peripheral side of the crawler body and the tensile member 11 is arranged on the outer peripheral side of the crawler body. Reference numeral 8 shows a cored bar 9 in which a reinforcing body 10 is attached to one side in the circumferential direction of the crawler body 5 and the cored bar 9 and the reinforcing body 10 are sandwiched between protective members 12 (or a tensile body 11 is sandwiched between them). However, in FIG. 10, the core metal 9
In FIG. 11, the reinforcing body 10 is adhered to the front and rear of the crawler body 5 in the circumferential direction, and FIG. 11 shows the front and rear reinforcing bodies 10 integrally connected to each other and the core metal 9 embedded in the reinforcing body 10. Show.

Although the elastic crawler used in the tire drive type crawler traveling device is shown in the above embodiment, it may be employed in the sprocket drive type crawler traveling device.

[0021]

According to the present invention, in the elastic crawler in which the core bars 9 in the width direction are provided at a predetermined interval in the circumferential direction in the endless belt-shaped crawler body 5 made of an elastic material, Since the reinforcing body 10 is provided on at least one of the front and rear sides of the core metal 9 in the circumferential direction of the crawler body 5, the reinforcing body 10 allows the reinforcing member 10 to be wound around the wheel.
Bending of the front and rear portions of the cored bar 9 in the circumferential direction of the crawler body 5 can be relaxed, fatigue due to the bending can be reduced, and the winding on the wheel can be smoothed, and the extension of the crawler body 5 on the contact surface side can be relaxed. From the above, the durability can be improved. By relaxing the bending, the adhesion fatigue between the crawler body 5 and the cored bar 9 or the tensile body is reduced, and the peel strength can be maintained.

Further, a reinforcing body 10 is provided on at least one of the front and rear sides of the core bar 9 in the crawler body 5 in the circumferential direction of the crawler body 5 so that the circumferential reinforcing members 11 and 12 have a gentle shape in the portion. As a result, it is possible to prevent the circumferential reinforcing member from locally bending in the front and rear portions of the cored bar 9 in the circumferential direction of the crawler body 5 as in the conventional case, and the front and rear portions of the cored bar 9 in the circumferential direction of the crawler body 5 can be avoided. Fatigue due to the bending of the circumferential reinforcing portions 11 and 12 is alleviated and the durability can be improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of an elastic crawler according to an embodiment.

FIG. 2 is a side view of a crawler traveling device.

FIG. 3 is a sectional view of a crawler traveling device.

FIG. 4 is a plan view of the crawler body as viewed from the inner peripheral surface.

FIG. 5 is a side sectional view of an elastic crawler according to another embodiment.

FIG. 6 is a side sectional view of an elastic crawler according to another embodiment.

7 is a sectional view of a crawler traveling device corresponding to the elastic crawler according to the embodiment of FIG.

FIG. 8 is a cross-sectional view of a cored bar and a reinforcing body according to another embodiment.

FIG. 9 is a cross-sectional view of a cored bar and a reinforcing body according to another embodiment.

FIG. 10 is a cross-sectional view of a cored bar and a reinforcing body according to another embodiment.

FIG. 11 is a cross-sectional view of a cored bar and a reinforcing body according to another embodiment.

FIG. 12 is a side sectional view of a crawler traveling device according to a conventional example.

[Explanation of symbols]

 4 Elastic Crawler 5 Crawler Main Body 9 Core Bar 10 Reinforcement Body 11 Tensile Body (Circumferential Reinforcement Member) 12 Protective Member (Circular Direction Reinforcement Member)

Claims (2)

[Claims] 1. An elastic crawler in which an endless strip-shaped crawler body (5) made of an elastic material is provided with cores (9) in the width direction at predetermined intervals in the circumferential direction, the inside of the crawler body (5). At least one of the front and rear sides of the core bar (9) in the circumferential direction of the crawler body (5) is reinforced (1).
0) is provided. 2. The endless belt-shaped crawler body (5) made of an elastic material is provided with metal cores (9) in the width direction at predetermined intervals in the circumferential direction, and the crawler body 5 is circumferentially reinforced in the circumferential direction. An elastic crawler provided with members (11) and (12), wherein a core metal (9) in the crawler body (5) is circumferentially reinforced on at least one side of the crawler body (5) in the circumferential direction. An elastic crawler characterized in that a reinforcing body (10) is provided so that the members (11) and (12) have a gentle shape.