JPH08119161A - Wheel coming-off prevention structure for elastic crawler - Google Patents

Abstract

PURPOSE: To have no slope face between wheels and left/right wheel coming-off prevention projections and stop deviation movement in the vertical direction by planar contact of approximately vertical face so as to surely prevent wheel coming-off of an elastic crawler. CONSTITUTION: Rolling faces 12, 13 for passing wheels 2, 3 are formed in the internal face of an endless belt crawler main body 5 of an elastic material, wheel coming-off prevention projections 11 for regulating position of wheels in the lateral direction are projected in the circumferencial direction at same intervals along the rolling faces, and respective wheel coming-off prevention projections 11 are so formed as gradually narrowing toward the tip. The outer circumference of the side faces of the wheels 2, 3 opposed to the wheel coming- off prevention projections 11 are formed into flat faces 2A, 3A and approximately perpendicular faces 11A, 11B are formed on the base of the wheel coming-off prevention projections opposed thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing wheel slippage of an elastic crawler used in a traveling device such as a transport machine, an agricultural machine, a construction / civil engineering machine, and a snowplow.

[0002]

2. Description of the Related Art A crawler of this type is disclosed in Japanese Patent Laid-Open No. 2-279.
As disclosed in Japanese Patent Publication No. 47 (illustrated in FIG. 5), a pair of left and right wheel removal preventing projections 42 are projected on the inner peripheral surface of the elastic material endless belt-shaped crawler body 41 at intervals in the circumferential direction, A rolling surface 43 through which the drive wheel passes is formed in the middle of the left and right wheel removal prevention protrusions 42, and both outer sides of the left and right wheel removal prevention protrusions 42 are rolling surfaces 44 of the matagi wheel 3, and each wheel removal prevention protrusion 42 is tapered. The left and right wheel release prevention protrusions 42 and the matagi wheel 3 are formed into inclined surfaces and tapered surfaces, respectively.

[0003]

In the above-mentioned prior art, when a relative lateral force acts between the body and the crawler on an inclined ground, the Matagi rolling wheel 3 is brought into contact with the inclined surface of the left and right wheel release prevention projection 42. Along with that, a vertical displacement occurs on the tip side thereof to promote derailment. Such an action similarly occurs also in the case of the intermediate transfer wheel in which the transfer wheel passes through the middle of the left and right wheel release prevention protrusions, and in the case of the drive wheel, to a lesser extent, it contributes to the removal of the wheel.

According to the present invention, the outer periphery of the side surface of the wheel facing the wheel removal preventing projection is formed into a flat surface, and a substantially vertical surface is formed at the base of the wheel removal preventing projection facing the wheel to prevent the wheel from coming off. It is an object of the present invention to provide a derailment prevention structure for an elastic crawler in which an inclined surface is eliminated between the elastic crawler and the claw so as to prevent vertical displacement.

[0005]

A specific means for solving the problem in the present invention is to provide a rolling surface 12 through which a wheel 2 (or 3) passes on the inner peripheral surface of an endless belt-shaped crawler body 5 made of an elastic material. (Or 13) is formed, and the wheel-separation prevention protrusion 11 that regulates the position of the wheel 2 in the left-right direction along the rolling surface 12 is formed.
In a wheel removal prevention structure of an elastic crawler in which the wheel removal prevention projections 11 are formed at intervals in the circumferential direction and the tip ends of the wheel removal prevention projections 11 are tapered, a side surface outer periphery of the wheel 2 facing the wheel removal prevention projections 11 is a flat surface 2A ( Or 3A), and a substantially vertical surface 11A is formed on the base portion of the wheel removal preventing projection 11 facing this.

A second specific means for solving the problem in the present invention is to provide a pair of left and right wheel removal preventing projections 11 on the inner peripheral surface of the endless belt-shaped crawler main body 5 made of an elastic material with a circumferential interval. The drive wheel 2 protrudes and the middle of the left and right wheel release prevention projections 11
Is a rolling surface 12 through which the wheels pass, and both outer sides of the left and right wheel slip prevention protrusions 11 are rolling surfaces 13 of the matagi wheel 3, and each wheel slip prevention protrusion 11 is formed with a tapered tip. In, the outer periphery of the inner and outer surfaces of the Matagi rolling wheel 3 is formed into a flat surface 3A, and the left and right wheel slip prevention protrusions 1 facing this are formed.
1. A substantially vertical surface 11A is formed at the base portion of the crawler main body 5, which corresponds to the circumferential direction of the derailment prevention projections on the inner peripheral surface of the crawler body 5 and is located on the left and right outer sides of the left and right matagi rolling surface 13 and on the outer peripheral flat surface 3 of the matagi rolling wheel 3.
That is, the outer derailment prevention projection 16 is provided which has a substantially vertical surface 16A facing A.

The third concrete means for solving the problems in the present invention is, in addition to the first or second concrete means, a portion on the radially inner side of the outer peripheral flat surface 3A of the wheel 2 is closer to the wheel removal preventing projection 11. It is formed on the tapered surface 3C, and in a state where the outer peripheral flat surface 3A of the wheel 2 is in surface contact with the substantially vertical surface 11A (or 11B) of the wheel release prevention protrusion 11, a portion closer to the tip side than the substantially vertical surface 11A of the wheel release prevention protrusion 11 is formed. A gap 14 is formed between the wheel 2 and the tapered surface 3C.
Is to have.

[0008]

[Operation] The elastic crawler 1 rides on a slope or a stone,
The drive wheel 2 and the middle wheel or the matagi wheel 3 are the crawler body 5.
When they try to shift in the left-right direction, the flat surfaces 2A, 3A on the outer circumferences of the side surfaces of those wheels make surface contact with the substantially vertical surfaces 11A, 11B of the base portions of the left-right wheel detachment prevention projections 11 facing them.

Wheel planes 2A, 3A and wheel release prevention projection 11
Since the surface contact with the substantially vertical surfaces 11A and 11B is not inclined with respect to the inner peripheral surface of the crawler body 5, there is no relative displacement in the vertical direction unlike the inclined surface, and the wheel removal by the inclined surface is prevented. Prevent. Outer wheel removal prevention protrusions 16 formed on the left and right outer sides of the left and right matagi roller rolling surfaces 13 corresponding to the circumferential direction of the wheel removal prevention projections on the inner peripheral surface of the crawler body 5 are substantially vertical surfaces facing the matagi wheel 3. 16A, elastic crawler 1
On the other hand, when the Matagi rolling wheel 3 tries to shift in the left-right direction, it engages with this and prevents the shifting movement.

There is a gap 14 between the tip end side of the substantially vertical surface 11A of the wheel removal prevention protrusion 11 and the radially inner side of the wheel flat surfaces 2A, 3A, and the left and right wheel removal prevention protrusion 11 is substantially vertical. The surfaces 11A and 11B are in surface contact with the wheel flat surfaces 2A and 3A without being disturbed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes an elastic crawler used in a traveling device such as an agricultural machine, which is wound around wheels such as a drive wheel 2, a driving wheel, and a rolling wheel 3. The roller 3 is a Matagi roller, and a middle roller may be used.

The elastic crawler 1 has a core metal 6 embedded in an endless belt-shaped crawler body 5 made of an elastic material at regular intervals in the circumferential direction, and a pair of left and right circumferential tension members 7 on the outer peripheral side of the core metal 6. Is buried. Left and right (width) of the crawler body 5
An engagement hole 8 for engaging the drive wheel 2 is formed between the cores 6 in the circumferential direction at the center of the direction. A lug 9 is integrally formed on the outer peripheral surface of the elastic crawler 1 at regular intervals in the circumferential direction so as to correspond to the cored bar 6 or be displaced in the circumferential direction. The protrusions 11 are formed at equal intervals in the circumferential direction. The wheel drop prevention protrusion 11 has a tapered tip,
Although it is formed by the protruding portion 6A of the cored bar 6, it may be integrally formed with the elastic crawler 1 by using the same material as the elastic crawler 1 such as rubber.

On the inner peripheral surface of the elastic crawler 1, the middle of the left and right wheel release prevention projections 11 is a rolling surface 12 through which the drive wheels 2 and the inner race wheels pass. It is a rolling surface 13 through which the Matagi rolling wheel 3 passes.
The outer periphery of the inner side surface of the matagi wheel 3 that faces the left and right wheel removal prevention protrusions 11 is formed into a flat surface 3A, and the outer periphery of the outer surface of the drive wheel 2 that faces the left and right wheel removal prevention protrusions 11 is also the flat surface 2A.
It is formed in A.

The bases of the derailment prevention projections 11 that face the outer peripheral flat surface 3A of the matagi wheel 3 and the outer peripheral flat surface 2A of the drive wheel 2 are perpendicular to the inner peripheral surface of the elastic crawler 1, that is, substantially perpendicular. The surfaces 11A and 11B are formed so that the substantially vertical surfaces 11A and 11B face the outer peripheral flat surfaces 3A and 2A in parallel. Each derailment prevention projection 11 has a substantially vertical surface 11A, 11
B has a tapered truncated pyramid shape on the front end side and has an inclined surface 11C on the inner and outer surfaces, and a tapered surface 3C on the inner side of the flat surface 3A of the matagi rolling wheel 3 facing the inclined surface 11C. A gap 1 is formed between the wheel prevention protrusion 11 and the inclined surface 11C.
4 is present even when the flat surface 3A is in contact with the substantially vertical surfaces 11A and 11B of the left and right wheel release prevention projection 11 so that the tapered surface 3B does not contact the wheel removal prevention projection 11.

Substantially vertical surface 11 of each derailment prevention projection 11
The height H1 of A and 11B is generally greater than one-fifth and less than one-half of the total height H2 of the derailing prevention projection 11, and is the same as the height H3 of the flat surface 3A of the matagi roller 3 or It is preferably a little small. The angle θ1 of the inclined surface 11C is the taper surface 3
It is preferable that the angle is larger than the angle θ2 of C, so that the gap 14 is secured.

The inner peripheral surface of the crawler body 5 is substantially vertical and corresponds to the circumferential direction of the derailment prevention projections 11 and on the left and right outside of the rolling surface 13 of the left and right matagi roller 3 to face the matagi roller 3. An outer wheel removal prevention protrusion 16 having a surface 16A is provided. The outer wheel removal prevention protrusion 16 engages with the Matagi rolling wheel 3 on the mountain side of the sloping ground to positively prevent the Matagi rolling wheel 3 from shifting laterally with respect to the elastic crawler 1. , Is formed in a trapezoidal shape or a triangular shape in a front view, which is sufficiently smaller than the derailment prevention projection 11, and its height H4 is lower than the height H1 of the substantially vertical surfaces 11A and 11B, and preferably about half the height. .

FIG. 4 shows a modified example in which the left and right wheel release prevention projections 11 are substantially vertical surfaces 11A only on the rolling surface 13 side of the base.
Is formed, and the surface on the rolling surface 12 side is an inclined surface from the crawler body 5 side to the tip as in the prior art. A recess 15 is formed from the substantially vertical surface 11A of the wheel removal preventing protrusion 11 to the tip thereof, and when the angle θ2 of the taper surface 3C of the matagi wheel 3 is large, the inclined surface 11C does not come into contact with the surface. Even if 3A and the substantially vertical surface 11A come into contact with each other, the gap 14 is secured between the tapered surface 3C and the inclined surface 11C.

In this variant, the substantially vertical surface 1 for the drive wheels 2
1B is not provided, and in the above embodiment, the wheel drop prevention projection 1
The inner surface of 1 may not have the substantially vertical surface 11B. On the contrary, in the elastic crawler 1 of the above-mentioned embodiment, in which the intermediate roller passes through the rolling surface 12 instead of the matagi roller 3, only the substantially vertical surface 11B is formed without forming the substantially vertical surface 11A. You may.

The present invention is not limited to the above embodiment, but can be variously modified. For example, the elastic crawler 1 does not need to have a cored bar embedded in the crawler body 5, one row of the wheel removal preventing projections 11 is arranged only in the center of the crawler body 5 in the left-right direction, and the rolling surfaces 13 on the left and right sides thereof are used as the drive wheels. It is also applicable to those in which 2 and Matagi rolling wheel 3 roll.
It is even more effective if a low friction coefficient material such as rubber, resin, metal or nylon canvas is used in the wheel release preventing protrusion, particularly in the portion that comes into contact with the rolling wheels.

[0020]

According to the present invention described in detail above, the outer periphery of the side surface of the wheel facing the wheel removal prevention protrusion is formed into a flat surface, and the base of the wheel removal prevention protrusion facing this is formed with a substantially vertical surface. Since there is no inclined surface between the wheel and the left and right wheel release prevention protrusions,
It is possible to prevent the elastic crawler from slipping off more reliably by preventing vertical displacement due to the substantially vertical surface contact.

Further, the outer circumferences of the inner and outer surfaces of the Matagi rolling wheel are formed into flat surfaces, and substantially vertical surfaces are formed at the bases of the left and right derailment prevention projections that face the mati wheel. Since the outer wheel removal prevention protrusions are provided on the left and right outer sides of the left and right matagi rolling wheels to form a substantially vertical surface that faces the outer peripheral flat surface of the matagi rolling wheel, the wheel and the left and right wheel removal prevention protrusions are provided. Since there is no inclined surface between the two, vertical displacement can be prevented by surface contact of a substantially vertical surface, and even the outer wheel removal prevention protrusion can prevent the crawler main body and the matagi wheel from moving in the left-right direction. It is possible to more reliably prevent derailment over all the corresponding positions and the corresponding positions between the circumferential direction derailment prevention projections.

Further, a portion radially inward of the outer peripheral plane of the wheel is formed into a tapered surface approaching the wheel release prevention projection, and the wheel removal prevention is carried out in a state where the outer peripheral plane of the wheel is in surface contact with the substantially vertical surface of the left and right wheel release prevention projections. Since there is a gap between the tip end side of the substantially vertical surface of the protrusion and the tapered surface of the wheel, it is possible to ensure surface contact between the substantially vertical surface of the left and right wheel release prevention protrusion and the outer peripheral surface of the wheel.

[Brief description of drawings]

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

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged cross-sectional view of a main part.

FIG. 4 is an enlarged cross-sectional view of a main part showing a modified example.

FIG. 5 is an enlarged cross-sectional view of a main part showing a conventional technique.

[Explanation of symbols]

 1 Elastic Crawler 2 Drive Wheel 3 Rolling Wheel (Matagi Rolling Wheel) 5 Crawler Main Body 11 Derailment Prevention Protrusion 11A Substantially Vertical Surface 11B Substantially Vertical Surface 12 Rolling Surface 13 Rolling Surface 14 Gap 16 Outer Derailing Prevention Protrusion

Claims (3)

[Claims] 1. A wheel removal preventing projection for forming a rolling surface through which a wheel passes on an inner peripheral surface of an endless belt-shaped crawler body made of an elastic material, and for regulating the position of the wheel in the left-right direction along the rolling surface. In a wheel removal prevention structure of an elastic crawler that protrudes at intervals in the circumferential direction and each of the wheel removal prevention protrusions is formed in a tapered shape, the side surface outer periphery of the wheel facing the wheel removal prevention protrusion is formed into a flat surface, A derailment prevention structure for an elastic crawler, characterized in that a substantially vertical surface is formed on the base of the derailment prevention projection facing to. 2. A pair of left and right wheel removal preventing protrusions are circumferentially spaced from the inner peripheral surface of an elastic material endless belt-shaped crawler body, and a drive wheel passes through the middle of the left and right wheel releasing prevention protrusions. In the derailment prevention structure of the elastic crawler in which both sides of the left and right derailment prevention projections are the rolling surfaces of the matagi rolling wheels, and each derailment prevention projection is formed in a tapered tip, the inner and outer surfaces of the matagi rolling wheel The outer surface of the crawler body is formed into a flat surface, and the bases of the left and right wheel release prevention projections facing this are formed with a substantially vertical surface, which corresponds to the circumferential direction of the wheel removal prevention projections on the inner peripheral surface of the crawler body and the left and right mati rolls. A wheel removal preventing structure for an elastic crawler, characterized in that outer wheel removal preventing projections are provided on the right and left outer sides of the surface, and a substantially vertical surface facing the outer peripheral flat surface of the matagi wheel is provided. 3. The wheel derailment is formed in such a manner that a portion radially inside the outer peripheral plane of the wheel is formed into a taper surface that approaches the wheel release prevention protrusion, and the outer peripheral plane of the wheel is in surface contact with the substantially vertical surface of the left and right wheel release prevention protrusions. 3. A gap is provided between a portion of the prevention projection on the tip side of the substantially vertical surface and the tapered surface of the wheel.
The elastic crawler derailment prevention structure described in.