JPS5925732Y2 - crawler - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crawler in which a lug made of an elastic material is provided protruding from a crawler shoe over substantially the entire width thereof in the width direction.

This type of crawler has lugs made of a relatively hard elastic material protruding from the crawler shoes, and the lugs bite into the road surface or partially increase the pressure on the ground surface to obtain a strong propulsion force. However, in conventional general crawler rollers, the lugs are formed in a straight line substantially perpendicular to the direction of rotation of the crawler shoes, and there is no possibility of mud clogging or clogging between the lugs. In order to avoid deterioration of the biting function due to a decrease in contact pressure, the lug spacing was relatively large, so when rotating, local vibrations were likely to occur at the point where each lug first touched the ground. Because it has a straight lug shape, it is prone to skidding and has poor straight-line performance, and is also easily deformed by the resistance of the ground surface, making it difficult to obtain sufficient propulsion force.

To solve this drawback of linear lugs,
For example, as shown in Japanese Unexamined Patent Application Publication No. 49-12536, there is also known a technique in which the lug shape is formed into a mountain shape in which the center portion of the crawler shoe in the width direction protrudes forward in the rotational direction of the crawler shoe. ing.

In this case, compared to the linear lugs described above, even if the number of lug protrusions is the same, the area where no lug does not exist in the front and rear direction of rotation of the crawler shoe is reduced, and the actual lug spacing is reduced. It is advantageous in that it can be made sufficiently small and vibrations generated at the beginning of contact with the ground due to the large lug interval can be suppressed to a certain extent, and since the entire lug is formed in a mountain shape and its shape retention is enhanced, There is a disadvantage in that the durability of the lug is unavoidably reduced due to generation of vibration due to the impactful contact of the tip portion of the mountain shape with the ground, or the impactful contact with the ground.

Therefore, by changing the material of the elastic material lug,
In other words, the lug may be made of a soft elastic material that has sufficient elasticity so that even if it makes impactful contact with the ground, it will not cause large vibrations, so as to absorb the vibrations. Although it is not inconceivable, if the lug itself is made of a soft material with sufficient elasticity, a new problem arises: the lug becomes too easily deformed, making it impossible to obtain sufficient thrust. A point occurs.

The purpose of this invention is to avoid the drastic reduction in thrust due to large deformation of the lug by using the lug made of the above-mentioned relatively hard general elastic material, while also avoiding the unique configuration of the lug shape. Accordingly, it is an object of the present invention to provide a crawler having excellent vibration mitigation and durability.

The features of the present invention to achieve the above objectives are as follows:
A lug made of an elastic material is provided on the outer periphery of the crawler shoe, and has a length approximately equal to the width of the crawler shoe, and has a front edge in the forward rotational direction of the crawler shoe that is curved forward in the rotational direction. At the same time as protruding from the lug, at approximately the center position in the width direction of the lug, the central protruding part located at the frontmost part in the forward rotational direction is more easily deformed than other parts.
The wall thickness of this central convex portion in the rotation direction is made smaller than the wall thickness of the other portions in the rotation direction over substantially the entire area from the base to the top of the lug.

The effects of the above configuration are as follows.

That is, even if the leading edge is shaped to protrude forward in the rotational direction of the crawler shoe, the wall thickness in the rotational direction of the central protruding portion located at the forefront in the forward rotational direction is By being smaller than the other parts, the elastic deformation of this central protruding part can be performed more easily than the other parts, and therefore, during crawler driving, the leading lug The impact on the ground at this centrally curved part that first contacts the ground with an interval between them is alleviated by its own elastic deformation, and after this centrally curved part comes into contact with the ground, it continues continuously. Since the other lug portions that contact the ground are subjected to the cushioning effect of the central curved portion that is already in contact with the ground, the wall thickness in the direction of rotation of the crawler shoe is simply the same. or, compared to a conventional structure in which the wall thickness is larger at a portion corresponding to the central convex portion, the occurrence of vibration due to the impact can be significantly reduced; Even when the entire lug is made of an elastic material that is soft enough to cushion the impact, only the central portion of the lug is susceptible to change, and the end lug portions on both left and right sides are not sufficiently protected. Because of its shape, it is possible to avoid the inconvenience that the entire lug deforms significantly, resulting in a significant reduction in the biting depth, or that the lug width is substantially narrowed, resulting in a significant reduction in the thrust force generated by the lug. It is advantageous in terms of gain.

Furthermore, this lug is made of a relatively hard elastic material in order to obtain sufficient thrust, since the impact on the central convex portion is alleviated by the elastic deformation of the central convex portion itself. Because of this, it is vulnerable to shocks,
In other words, there is less risk of damage such as partial chipping of the central convex portion due to impact force caused by contact with the ground, and in this respect there is an advantage that a highly durable crawler can be obtained.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows a side view of the main part, Figure 2 shows an enlarged view of the main part,
This consists of a drive sprocket 4 attached to a crawler frame 3, a tension idler 5, and an idling roller 6...
. . . In a crawler in which a crawler shoe 1 is suspended over a period of time, the crawler shoe 1 has a length extending over substantially the entire range in the width direction, and the center portion in the width direction is the crawler shoe 1. -1 Lugs 2 made of an elastic material and having a shape in plan view projecting forward in the forward rotational direction F are fixed at appropriate intervals in the rotational direction of the crawler shoe 1, and the Each lug 2... has a wall thickness in the direction along the rotating direction of the respective crawler shoe 1, and the central protruding portion 2a located at the center position of ゛ in the width direction of the crawler shoe 1 is elastic. In order to be easily deformed, the wall thickness L1 of this central protruding portion 2a is made to be sufficiently smaller than the wall thickness L2 of the other outer portions 2b extending from side to side over the entire area from the base to the top. It's a big deal.

In addition, in FIG. 2, the above-mentioned wall thickness L1. For convenience, set L2 to Lag 2.
The figure shows the thickness of the top of the plate.

Note that although numbers are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of the crawler according to the present invention, and FIG. 1 is a side view of the main parts, and FIG. 2 is an enlarged view of the main parts taken along the line II--II in FIG. 1...Crawler shoe, 2...Lug made of elastic material, 2a...Central protruding portion, 2b...
... Other parts, L ... Thickness of central convex part,
L2...Thickness of other parts.

Claims (1)

[Scope of utility model registration request] An elastic material is provided on the outer circumferential portion of the crawler shoe 1 and has a length approximately equal to the width of the crawler shoe 1, and is configured in a shape such that the front edge in the forward rotational direction of the crawler shoe 1 is curved forward in the rotational direction. In addition to the protrudingly provided lug 2, the central protruding portion 2a located approximately at the center of the plug 2 in the width direction and at the forefront in the forward rotational direction is more easily deformed than the other portions 2b. To the extent that the thickness L1 of the central protruding portion 2a in the rotation direction is equal to the thickness L2 of the other portion 2b in the rotation direction over approximately the entire area from the base to the top of the lug 2,
A crawler that is characterized by its smaller size than that of a crawler.