JPH06263067A - Elastic crawler device - Google Patents

Abstract

PURPOSE:To obtain uniform grounding pressure and prevent slip by forming the opposite inner faces of a pair of drive force transmitting parts provided on the inner circumferential face of a crawler main body into inclined faces so as to wedge-likely receive a driving wheel, forming engaging recessed parts in the circumferential direction on the drive force transmitting parts, and providing aging projections to be engaged with them on the driving wheel. CONSTITUTION:A crawler main body 2 is provided with right and left a pair of drive force transmitting parts 6 on the inner circumference spacedly in the width direction, and the opposite inner faces of the part 6 are formed into inclined faces 6A so as to wedge-likely receive a driving wheel 5 and the like in face contact. Consequently, the drive force is transmitted to the part 6 by friction resistance due to wedge-like engagement of the driving wheel. Engaging projections 12 are formed on the inclined face 5A of the driving wheel 5 at equal intervals in the circumferential direction, engaging recessed parts 11 are formed on the part 6 at equal intervals in the circumferential direction, and the projection 12 can be loosely fitted to the recessed part 11. The face 11A of the recessed part 11 is in parallel with the face 6A or in larger angle. Namely, it receives wedge force from the projection 12 similar to the face 6A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic crawler device used for traveling vehicles for agriculture and civil engineering.

[0002]

2. Description of the Related Art A mainstream of elastic crawler devices is a crawler body in which a cored bar is embedded at intervals in the circumferential direction. However, this cored elastic crawler increases the weight due to the cored bar. However, it causes driving loss and cost, and makes disposal difficult. As a solution to the problem of the cored elastic crawler, a coreless crawler (Japanese Patent Laid-Open No. 4-92785) shown in FIG. 6 has been developed.

The coreless crawler 21 has a circumferential tension member 23 embedded in a crawler body 22 made of an elastic material, and a lug 24 protruding from the outer circumference of the crawler body 22.
A substantially V-shaped groove 2 on the outer periphery of the drive wheel 25 at the center of the inner peripheral surface in the width direction.
It is configured by projecting a ridge portion 26 to which 5A is fitted.

[0004]

In the above-mentioned prior art, the driving wheel 25 has a flange-shaped belt receiving portion 25B projecting axially on both sides so that both widthwise sides (wing portions) of the crawler body 22 do not escape from the ground. When the belt receiving portion 25B comes into contact with the inner peripheral surface of the crawler body 22, the groove 2
When the 5A and the protrusion 26 are fitted together, it is difficult to expect the transmission of the driving force.

Therefore, the crawler body 22 and the drive wheels 25
In order to obtain a uniform ground contact pressure over the entire width, slippage is likely to occur between the wheels and the contact surface between them, and the axial length of the wheel is approximately the width of the crawler. They have to be equalized, and there is a problem that the weight and cost on the vehicle side increase. A first object of the present invention is to provide a pair of driving force transmission parts on the inner peripheral surface of the crawler body,
The opposing inner surface is used as an inclined surface to allow the driving wheel to enter the wedge shape to transmit the driving force, and the driving force transmission portion is extended to the vicinity of both ends in the width direction of the crawler body. By forming the engagement protrusions on the drive wheels respectively, the wedge force received from the drive wheels is propagated to both sides in the width direction of the crawler body to obtain a uniform ground pressure over the entire width and to prevent slippage. It is to provide a device.

A second object of the present invention is to provide an elastic crawler device in which an inclined surface is also formed in the engaging concave portion so that the ground pressure can be obtained even at the engaging portion with the engaging protrusion.

[0007]

A first specific means for solving the problem in the present invention is to embed a circumferential tensile member 3 in a crawler body 2 made of an elastic material to form a crawler body 2. Is an elastic crawler device in which a lug 4 is provided on the outer periphery of the crawler main body 2 and a drive force transmitting portion for transmitting the drive force is provided on the inner peripheral surface of the crawler body 2. A pair of inner circumferential surfaces are provided at intervals in the width direction. The opposing inner surfaces of the crawler body 2 are inclined surfaces 6A into which the drive wheels 5 enter a wedge shape. To extend to both sides in the width direction of the crawler body 2, the driving force transmitting portion 6 is formed with engaging recesses 11 at equal intervals in the circumferential direction, and the driving wheels 5 are engaged with each other. Engagement protrusion 12 that engages with the mating recess 11
Is formed.

The second concrete means for solving the problem in the present invention is the engaging recess 1 which receives a load from the engaging projection 12.
The surface No. 1 is formed as an inclined surface 11A that is inclined from the center side in the crawler width direction to both sides away from the crawler body 2 inwardly of the crawler.

[0009]

When the driving wheel 5 rotates between the left and right driving force transmitting portions 6, frictional resistance and wedge force act on the inclined surface 6A, and the driving force of the driving wheel 5 causes the driving force transmitting portion 6 to act on the inclined surface 6A. It is transmitted to the crawler body 2 via the. The wedge force applied to the inclined surface 6A of the driving force transmitting portion 6 acts to push the left and right inclined surfaces 6A outward in the width direction, and the driving force transmitting portion 6 is extended to the vicinity of both ends in the width direction of the crawler body 2. Therefore, the pushing force propagates to both sides of the crawler body 2 in the width direction, increasing the blade rigidity,
The crawler body 2 will be grounded uniformly over the entire width.

Engagement protrusions 1 formed on the left and right side surfaces of the drive wheel 5.
Reference numeral 2 engages with the engaging recess 11 of the driving force transmitting portion 6 to prevent slippage between the two, and the load of the engaging projection 12 is applied to the inclined surface 11A of the engaging recess 11, and this inclined surface 11A is the crawler width. By inclining from the center side in the direction toward both sides so as to separate from the crawler body 2 inward of the crawler, both widthwise sides of the crawler body 2 are pressed in the ground contact direction.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIGS. 1 and 2, 1A is an elastic crawler formed in an endless annular shape, and a tensile body 3 formed of a steel cord or the like is provided inside a crawler body 2 formed of an elastic material such as rubber. Are embedded along the circumferential direction, and a metal cored bar is not provided.

The crawler main body 2 has lugs 4 projecting on the outer circumference thereof at equal intervals in the circumferential direction, and a pair of left and right driving force transmitting portions 6 are provided on the inner circumference thereof at intervals in the width direction. The pair of driving force transmitting portions 6 are protrusions extending over the entire length of the crawler body 2, and the driving wheels 5, the driving wheels, and the rolling wheels can be fitted between them. The wheels such as the drive wheels 5 are disk-shaped and the outer peripheral portions are tapered in the radial direction in the radial direction. It is surface 6A. Therefore, the driving force is transmitted to the driving force transmitting portion 6 by the frictional resistance due to the wedge-shaped engagement of the driving wheels 5.

Engaging projections 12 are formed on the inclined surface 5A of the drive wheel 5 at equal intervals in the circumferential direction. The width and the amount of protrusion of each engaging projection 12 are tapered outward in the radial direction, and the outer surface thereof is an inclined surface 12A having the same angle as or a larger angle than the inclined surface 5A. Corresponding to the engaging projections 12 of the drive wheel 5, engaging recesses 11 are formed in the driving force transmitting portion 6 at equal intervals in the circumferential direction, and the engaging recesses 11 are engaged with the engaging projections 12 in the circumferential direction. Can be loosely fitted to each other, and the relative movement is restricted by fitting them together. In addition, they are in close contact with each other in the crawler width direction (projection protrusion direction).

Engagement recess 11 to which the load of engagement projection 12 is applied
The surface 11A is parallel to or has a large angle with the inclined surface 6A. That is, the inclined surface 11A is inclined from the center side in the crawler width direction to both sides so as to separate from the crawler main body 2 inwardly of the crawler, and the inclined surface 6A receives the wedge force from the drive wheel 5 as well as the engaging projection. Receives wedge force from 12. The opposite outer side portion of the left-right driving force transmitting portion 6 is formed in an inner peripheral side arcuate concave shape, and its end portion extends to the side edge of the crawler body 2. The wedge force that the wheels such as the drive wheels 5 give to the drive force transmission portion 6 by the wedge-shaped engagement is propagated to the side edge of the crawler body 2 via the opposing outer side portion, and the side portion (wing portion) of the crawler body 2 is propagated. It increases rigidity and generates a force to press it against the ground. This also applies to the portion where the engaging recess 11 is formed, and therefore, the driving force transmitting portion 6 extends over its entire length.
Transmits driving force and ground pressure.

In the second embodiment shown in FIGS. 4 and 5, the drive wheel 5 has pin-shaped engagement projections 12 formed on the inclined surface 5A at equal intervals in the circumferential direction. Drive wheel 5 of each engaging projection 12
The outside of the radius is an inclined surface 12A having an angle larger than the inclined surface 5A with respect to the perpendicular line S. In the elastic crawler 1B, the left and right driving force transmitting portions 6 are divided at regular intervals in the crawler circumferential direction, and the dividing grooves are the engaging recesses 11 with which the engaging protrusions 12 engage, and the side edges of the crawler body 2 are separated. Has not yet reached, and the driving force transmitting portion 6 is cut up toward the inner peripheral side of the crawler by the middle of the width direction.

Engagement recess 11 to which the load of engagement projection 12 is applied
The surface 11A has a larger angle with respect to the perpendicular S than the inclined surface 6A. That is, the inclined surface 11A is inclined from the crawler width direction center side to both sides away from the crawler body 2, and the inclined surface 6A receives the wedge force from the engaging wheel 12 so that the inclined surface 6A receives the wedge force from the drive wheel 5. receive. In the second embodiment, the engaging recess 11 is larger than that of the first embodiment, so that the crawler circumferential bending is easy, and the engaging protrusion 12 is large, so that the slip prevention function is high. The engagement protrusion 12 can also be a drive protrusion.

The present invention is not limited to the above embodiments, but can be variously modified. For example, the protrusion amount of the engaging projection 12 of the first embodiment may be increased, or a reinforcing material formed of cloth or the like may be embedded in the driving force transmitting portion 6 of the first embodiment.

[0018]

According to the present invention detailed above, the drive wheels 5 are
A pair of driving force transmitting portions 6 that contact with each other and transmit the driving force are provided on the inner circumference of the crawler body 2 at intervals in the width direction, and the opposing inner surfaces thereof are inclined surfaces 6A into which the driving wheels 5 enter a wedge shape. The opposing outside is extended to near both ends in the width direction of the crawler body 2 so that the wedge force received by the inclined surface 6A from the drive wheel 5 is propagated to both sides in the width direction of the crawler body 2. Engagement recesses 11 are formed at equal intervals in the circumferential direction, and engagement protrusions 12 that engage with the engagement recesses 11 are formed on the drive wheel 5.
Since it is formed, it can be driven by frictional resistance with the drive wheel 5 without a cored bar, and the elastic crawler 1 can be driven.
Almost no sand or stone is caught between the wheel and the wheel,
Moreover, it is possible to reliably ground the crawler main body 2 to the side end, the axial length of the drive wheel 5 is short, and the weight and cost can be reduced. Further, the drive wheel 5 and the drive force transmission portion 6 are Slip can be reliably prevented.

The surface of the engaging recess 11 which receives a load from the engaging projection 12 is formed as an inclined surface 11A which is inclined from the center side in the crawler width direction to both sides and away from the crawler body 2 inwardly of the crawler. Therefore, even if the engaging concave portion 11 is formed to prevent slippage, the inclined surface 11A can receive a pressing force from the engaging protrusion 12 and contribute to the grounding of the side end of the crawler body 2.

[Brief description of drawings]

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

FIG. 2 is a front view of the same section.

FIG. 3 is a perspective view of drive wheels used in the first embodiment.

FIG. 4 is a perspective view showing a second embodiment.

FIG. 5 is a cross-sectional front view perspective view of the same.

FIG. 6 is a sectional front view of a conventional technique.

[Explanation of symbols]

 1 Elastic Crawler 2 Crawler Main Body 3 Tensile Body 4 Lug 5 Drive Wheel 6 Drive Force Transmission Part 6A Sloping Surface 11 Engagement Recess 11A Inclined Surface 12 Engagement Protrusion 12A Inclined Surface

Claims (2)

[Claims] 1. A circumferential tensile body (3) is embedded in a crawler body (2) made of an elastic material, a lug (4) is provided on the outer circumference of the crawler body (2), and a drive wheel is provided on the inner circumference. An elastic crawler device in which driving force transmitting portions for abutting against each other (5) and transmitting the driving force are provided in a projecting manner, wherein the driving force transmitting portion (6) is provided on an inner peripheral surface of the crawler body (2) at a widthwise interval. The driving wheel (5) has a slanting surface (6A) into which the driving wheel (5) enters a wedge shape, and the facing outer surface has a slanting surface (6A) that receives a wedge force from the driving wheel (5). The crawler main body (2) is extended to near both ends in the width direction of the crawler body (2) so as to propagate to both sides in the width direction of (2), and the driving force transmitting portion (6) has engaging recesses (11) at equal intervals in the circumferential direction. The drive wheel (5) is formed with an engagement recess (1
An elastic crawler device, characterized in that an engagement protrusion (12) for engaging with 1) is formed. 2. The surface of the engagement recess (11) which receives a load from the engagement projection (12) is inclined so as to be separated from the crawler body (2) toward the inside of the crawler from the center side in the crawler width direction to both sides. The elastic crawler device according to claim 1, wherein the elastic crawler device is formed on the surface (11A). That is.