JP3533945B2 - Endless track - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler track for a special vehicle for earthmoving work, and particularly for both heavy load but low speed running and light load but high speed running. Suitable for those that can be used.

[0002]

2. Description of the Related Art Many conventional crawler tracks for special automobiles for earthwork work are those in which a metal pin or sleeve and a hole of a chain link are in direct contact with each other, especially when high speed traveling is required. Used rubber between the pin and the hole to absorb the impact of this metal contact. However, since this rubber is inferior in durability, it is known that a roller and a race are arranged at the same time as the rubber ring between the holes of the pin and the chain link. For example, as shown in FIG. 1 of JP-A-62-225472. Have been described.

[0003]

In the above prior art, the load applied to the rubber ring 3 is reduced, but most of the load is applied to the roller bearing consisting of the roller 6 and the race 5, which is the purpose of the rubber. It becomes impossible to absorb the impact during high-speed traveling, which may damage the roller bearing during high-speed traveling.

The object of the present invention is to solve the above-mentioned problems, absorb high-frequency shocks during high-speed running, and reduce the load even when static but heavy load such as earthwork is required.
It is to provide a tracked crawler track having sufficient durability even at high speed running and heavy work load.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a crawler track which is connected through holes to the holes of adjacent chain links through a pin, the outer circumference of the pin and the inner circumference of the hole of the chain link. And an annular body provided on the inner circumference of the hole and having rigidity higher than that of the annular elastic body.

As a result, in the case of a shock but a low load, only the rubber ring, which is an annular elastic body, receives the load, and in the case of a high load but a static load, most of the load is more rigid than the rubber ring. By making the metal bushes, which are large annular bodies, receive them, the durability of both can be improved.

Further, the present invention is the above-mentioned one in which the annular elastic body and the annular body are arranged alternately in the axial direction of the pin.

Further, in the above, it is desirable that the annular body is arranged so as to face the adjacent chain links.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG. In the one shown in the drawing, a rubber ring 3 which is an annular elastic body is press-fitted between the pin 1 and the holes of the chain links 2 and 2 ', and a metal bush 4 which is an annular body having a rigidity higher than that of the rubber ring is installed. The clearances δ are alternately inserted and arranged.

As shown in FIG. 1, when the rubber ring 3 press-fitted between the pin 1 and the hole of the chain link 2 and the metal bush 4 having the clearance δ are arranged in parallel, the pin 1
When a load P is applied between the chain link 2 and the chain link 2, the relative displacement Δ of the two becomes a two-stage relationship as shown in the figure. While the relative displacement Δ is smaller than the clearance δ of the metal bush, the rigidity of the rubber ring alone is achieved. However, when the displacement Δ exceeds the clearance δ, the metal bush also bears the load, and the rigidity rapidly increases. Here, the load during running has a small load level as shown in the figure, but it becomes a shocking high-frequency load, but such a load is absorbed by the rubber ring, and especially noise during high-speed running, metal bushing Wear can be prevented.

Also, although it is almost static as in earthwork, when a high load is applied, the rubber ring is completely crushed by this clearance δ and most of the load is received by the metal bush. . Therefore, it is possible to prevent the rubber ring from being damaged by such a high load. From the above,
Impact during running The load on the metal bush with a low load is reduced, and the load on the rubber ring with a heavy load during earthwork is reduced, and a rubber ring with a strong impact low load but a weak static heavy load is used. The durability and the durability of the metal bush resistant to a heavy load are properly secured, and it is possible to reduce the transmission of impact load to the vehicle body and noise during traveling.

Another embodiment of the present invention is shown in FIG. In the present embodiment, the metal bushes 4 are arranged so as to face each other at the opposing portions of the adjacent chain links 2. By doing so, the load points on the pins are dispersed and the maximum bending moment of the pins is reduced as compared with the case of general pin and chain link connection shown in FIG.
The fatigue strength of the pin can be improved.

In this case, there is a risk that the metal bush 4 moves in the axial direction and gets into the hole of the adjacent chain link, but one example for preventing this is shown in FIG. A ring-shaped small piece 7 is provided on the chain link 2 on the end face side of the metal bush 3'which faces the opposite parts of the adjacent chain links 2 and 2 ', and thereby the shift of the metal bush 3'is prevented. it can.

Another embodiment of the present invention is shown in FIG. In this example, in order to facilitate the insertion of the rubber ring 3 and the metal bush 4, an intermediate cylinder 8 is provided, and first, the rubber ring 3 and the metal bush 4 are arranged on the outer peripheral side of this intermediate cylinder. , The chain links 2 and 2'are inserted into the holes, and the pin 1 can be easily inserted, assembled and disassembled.

Another embodiment of the present invention is shown in FIG. In this example, the metal bush 4'is half-cracked, which makes it easy to attach and detach the metal bush.

[0016]

According to the present invention, a rubber ring, which is an annular elastic body, is provided on the outer periphery of the pin and the inner periphery of the hole of the chain link at the connecting portion of the crawler track, and the rigidity is greater than that of the annular elastic body. By using the metal bush, which is an annular body, in parallel, the impact load and noise during traveling due to the rubber ring and the metal bush are used. It is possible to reduce the load on the rubber bush during earthwork, and it is possible to obtain a highly durable crawler track for versatile purposes.

[Brief description of drawings]

FIG. 1 is a sectional view of a fastening portion showing an outline of a crawler track according to a conventional example.

FIG. 2 is an explanatory diagram showing a work according to one embodiment.

FIG. 3 is a cross-sectional view showing a fastening portion according to one embodiment.

FIG. 4 is an explanatory diagram showing a force relationship according to one embodiment.

FIG. 5 is an explanatory diagram showing a force relationship according to a conventional example.

FIG. 6 is a sectional view showing a fastening portion of another embodiment.

FIG. 7 is a cross-sectional view showing a fastening portion according to another embodiment.

FIG. 8 is a cross-sectional view showing a fastening portion according to still another embodiment.

[Explanation of symbols]

1 ... Pin, 2 ... Chain link, 3 ... Ring elastic body (rubber ring), 4 ... Ring elastic body (metal bush), 7 ... Ring-shaped small piece, 8 ... Intermediate tube.

Continued front page    (72) Inventor Masayuki Nakamura               502 Kandamachi, Tsuchiura City, Ibaraki Prefecture Co., Ltd.                 Hitachi Ltd. Mechanical Research Laboratory (72) Inventor Sadao Umezawa               502 Kandamachi, Tsuchiura City, Ibaraki Prefecture Co., Ltd.                 Hitachi Ltd. Mechanical Research Laboratory                (56) References JP-A-62-225472 (JP, A)                 Actual Development Sho 54-9437 (JP, U)

Claims (3)

(57) [Claims] 1. A crawler track linked through a pin to holes of adjacent chain links, wherein an annular elastic body provided on an outer periphery of the pin and an inner periphery of the hole of the chain link, and an inner portion of the hole. An annular body provided around the circumference and having a rigidity higher than that of the annular elastic body, and the outer circumference of the pin and the chain.
The first displacement between the inner link and the inner circumference of the hole
Supported by the elastic body and unsupported by the annular body, and
And the front of the annular elastic body when the second displacement is larger than
A crawler track characterized by being formed so as to be supported by an annular body . 2. A pin is provided in each hole of adjacent chain links.
Provided on the outer circumference of the pin and the inner circumference of the hole of the chain link in a tracked track that is connected through
And an annular elastic body that is provided on the inner circumference of the hole and has greater rigidity than the annular elastic body.
And an annular elastic body and annular bodies arranged alternately with respect to the axial direction of the pin, the annular body extending from the outer circumference of the pin to the chain link.
The thickness of the hole in the inner circumference is thinner than that of the annular elastic body.
Tracked track characterized by being formed . 3. The crawler track according to claim 2, wherein the annular body is arranged so as to face the adjacent chain links.