JPH0999875A - Mandrel for rubber crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discharge the sediment entering the inner periphery side of a rubber crawler to the outside by forming recesses vertically and horizontally partitioned by ribs on a coupling section. SOLUTION: A coupling section 2 is provided at the center of a mandrel 1. A pair of angular sections 3, 4 serving as travel faces when a roller passes between them or having a roller release preventing function are provided on both outsides of the coupling section 2. Vane sections 5, 5 extended to the right and left are provided on both outsides and integrally formed with the mandrel 1. Recesses 2P partitioned by cross-shaped ribs 2a are provided at four corners of the coupling section 2 to improve the fluidity of the sediment between the angular sections 3, 4. The ground pressure when a sprocket is coupled with the coupling section 2 is reduced, the sediment entering the inner periphery side of a crawler during a travel is moved to the recesses 2P of the coupling section 2 and discharged to the outside without being trodden down between them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler core metal embedded in a rubber crawler, and more particularly to a rubber crawler core metal having an improved dirt discharge property.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional rubber crawler, in which A is a plan view and B is a sectional view, and a sprocket engaging portion 102 is provided at the center thereof, and substantially rectangular corner portions 1 are provided on both sides thereof.
No. 03, 104, and further, the core metal 101 having the wing portions 105, 105 extending to the left and right on both outsides thereof is embedded at regular intervals and with the corner portions 103, 104 protruding from the rubber material R. An engaging hole 106 into which a sprocket tooth is fitted is opened in the center of the gold 101 in the width direction.

[0003]

When the rubber crawler travels on rough terrain or the like, earth and sand are taken in to the inner peripheral side of the rubber crawler. Since the abutment holes 106 are small, it is difficult for the earth and sand to be discharged to the outside. In particular, since the space between the corners 103 and 104 (M) is engaged with the sprocket S with a slight gap, the corner 10
The earth and sand are likely to stay between 3, 104, and when the sprocket S is engaged with the cored bar engaging portion 102, the earth and sand are compacted between them, and the earth and sand are accumulated on the engaging portion 102. As a result, the circumference of the rubber crawler is increased by the amount of accumulated soil and sand, and abnormal tension is applied to the rubber crawler. The present invention proposes a rubber crawler with good sediment discharge so as not to accumulate soil on the inner peripheral side of the rubber crawler.

[0004]

In order to achieve the above-mentioned object, the present invention provides a sprocket engaging portion at the center, has corner portions on both outer sides of the engaging portion, and further has left and right sides on both outer sides thereof. In the core bar for a rubber crawler provided with extending wings, the engaging portions and the corners are shaped to improve the mud discharging property.

That is, it is characterized in that the engaging portion is formed with a concave portion which is vertically and horizontally divided by a rib. In addition, the inner surfaces of the left and right corners that face each other are formed to be inclined surfaces in a top view, and for example, a substantially trapezoidal body in which the engaging portion side of the corner is short and the wing portion side is long, or the facing surface is partially formed. It is bent to form an inclined surface, or the left and right corners are arranged in a staggered pattern so as to be shifted forward and backward.
Further, a cored bar having a combination of the shapes of the concave portion and the corner portion of the engaging portion is more suitable for discharging the earth and sand.

[0006]

[Function] By forming the recessed portion separated by the rib in the engaging portion of the rubber crawler core metal, the ground pressure when the sprocket engages with the engaging portion becomes small, and enters the inner side of the crawler during running. It was prevented that the deposited sand moved to the concave portion of the engaging portion without being compacted between them, and was further discharged from the engaging hole to accumulate the sediment in the engaging portion.

Since the opposing inner surfaces of the right and left corners of the rubber crawler core bar are formed as inclined surfaces in a top view, the space between the left and right corners (engagement width) becomes large, and the sprocket is engaged between the corners. It can be done with a margin, and the earth and sand are smoothly discharged to the outside of the crawler along the inclined surface, the fluidity of the earth and sand is improved, and the earth and sand are prevented from accumulating in the engaging portion.

A substantially trapezoidal body in which the engaging portion side of the corner portion is short and the wing portion side is long, the opposing surface is partially refracted to form an inclined surface, or the left and right corner portions are staggered to be shifted back and forth. Since it is arranged, the core metal for rubber crawlers has excellent mud discharging properties while retaining the effects of preventing wheel corners from slipping off and reducing vibration.

[0009]

1 is a plan view showing a core bar for a rubber crawler according to a first embodiment of the present invention. In the figure, a core metal 1 is provided with an engaging portion 2 at the center thereof, and a pair of corner portions 3, which have a traveling surface when passing a rolling wheel on both outer sides of the engaging portion 2 or which have a function of preventing the rolling wheel from coming off. 4 and further provided with wing portions 5 and 5 extending to the left and right on both outer sides thereof to form an integrated body. The engaging portion 2 has a corner portion 3,
In order to improve the fluidity of the sand and sand between the four, concave portions 2P separated by cross-shaped ribs 2a are provided at the four corners.

FIG. 2 is a plan view showing a core bar for a rubber crawler which is a modification of the above embodiment. In the embodiment described above, the recesses 2p are provided at the four corners of the engaging portion 2, but in this embodiment, the engaging portion 2'is formed with two recesses 2p 'separated by the H-shaped rib 2a'. However, the left and right corners 3 ′ and 4 ′ may be staggered in the front and rear directions.

FIG. 3 is a plan view of a core bar for a rubber crawler showing another modified example. In this example, a rib 2 having a key step shape is formed in an engaging portion.
a "is formed so that two concave portions 2p" are formed in a zigzag manner. At this time, the edge portions of the corners 3 ", 4" where the concave portions 2p "are formed are shown in FIG. The mud discharging property is further improved when the defective state is obtained as shown in the example.

FIG. 4 is a plan view showing a rubber crawler core bar according to a second embodiment of the present invention.
Numerals 3 and 14 are point-symmetrical trapezoids having inner surfaces 13k, 14k facing each other in a top view and having an inclined surface inclined at a constant angle θ toward the core metal blade portion 15, and a part of the trapezoidal body is a core metal blade portion. It was arranged so as to project to the front and back of the width of 15. Therefore, the corner 1
Since the width (M) of the engaging portion is wide between 3 and 14, and engagement with the sprocket can be performed with a sufficient margin, the flowability of the earth and sand in the portion is good, and the inclined surface 13k,
14k are respectively inclined toward the core blade 15 side, that is, toward the crawler side surface, and the earth and sand entering between the corners are easily discharged to the outside along the inclined surface.

FIG. 5 is a plan view of a rubber crawler core bar according to a third embodiment of the present invention.
3 ′ and 14 ′ are formed by forming the facing inner surfaces 13 k ′ and 14 k ′ into a two-step center-folded refraction inclined surface. Also in this embodiment, the core metal engaging portion width (M) is larger than that of the conventional example. And
Improved mud discharge.

FIG. 6 shows a rubber crawler core metal according to a fourth embodiment of the present invention, in which A is a plan view and B is a sectional view taken along line XX of A. In this embodiment, the engaging portion 22 provided at the center of the cored bar 21 is provided with a concave portion 22p having an arcuate cross section divided by a cross-shaped rib 22a, and the rolling wheels pass on both outer sides of the engaging portion 2. The inner surfaces 23k and 24k facing each other in a top view of the pair of corners 23 and 24 having a function of preventing the wheel from slipping off have inclined surfaces inclined at a constant angle in the longitudinal direction of the core metal. The trapezoids were point-symmetrical, and the trapezoids were arranged so that a part of the trapezoids was shifted so as to project to the front and rear of the width of the core metal blade portion 25.

FIG. 7 is a plan view of a rubber crawler in which the cored bar 21 is embedded in a rubber material at a constant interval. In the rubber crawler, the sprocket has a large margin between the left and right corners (M). By engaging with the engaging portion 22, the fluidity of the earth and sand in the portion is improved, and the engaging portion 2
The earth and sand that have invaded into 2 are easily moved to the outside by the space between the adjacent corners (L) and the engagement hole 26. Further, it is possible to smoothly move the earth and sand to the crawler side surface along the inclined surfaces 23k and 24k of the corner portions 23 and 24.

FIG. 8 is a plan view of a rubber crawler core bar that is a modification of FIG. 1. As in the above embodiment, the engaging portion 32 is formed with a recess 32p divided by a cross-shaped rib 32a, and the right and left corners are formed. The opposing inner surfaces 33k and 34k of the portions 33 and 34 are inclined at a constant angle, and the left and right corner portions 33 and 34 are symmetrically arranged so as to have a V-shape, and exhibit the same action and effect.

The present invention is not limited to the above-mentioned embodiment, and it is preferable that the shape of the core metal is good for discharging mud. Although not shown, the corner of the core metal 1'in FIG. 2 is not shown. Part 3 ',
The inner surface of 4'opposite to each other is formed as an inclined surface with a constant angle as shown in FIGS. 4 and 5, or is formed into a refraction inclined surface, and the engaging portion 12 'of the cored bar 11' of FIG. The one having the concave portion as shown in FIG. 3 is also applicable.

[0018]

Since the present invention is configured as described above, it has the following effects.

Since the earth and sand that have entered the inner surface of the crawler are easily discharged to the outside from between the concave portion of the engaging portion and the corner portion of the core metal, the earth and sand accumulate on the inner peripheral side of the crawler, particularly between the sprocket and the engaging portion. Is prevented, abnormal tension is prevented from being applied to the rubber crawler, the durability of the rubber crawler is improved, and the machine body is protected, so long-term smooth running can be secured.

[Brief description of drawings]

FIG. 1 is a plan view showing a mandrel for a rubber crawler of a first embodiment.

FIG. 2 is a plan view of a rubber crawler core metal showing a modification of the first embodiment.

FIG. 3 is a plan view of a mandrel for a rubber crawler showing another modification of the first embodiment.

FIG. 4 is a plan view showing a mandrel for a rubber crawler of a second embodiment.

FIG. 5 is a plan view showing a mandrel for a rubber crawler of a third embodiment.

6A and 6B show a core bar for a rubber crawler of a fourth embodiment, where A is a plan view and B is a sectional view taken along line XX of A.

FIG. 7 is a plan view of a rubber crawler in which the cored bar of FIG. 6 is embedded in a rubber material at regular intervals.

FIG. 8 is a plan view of a rubber crawler core bar that is a modification of FIG. 1;

FIG. 9 shows a conventional rubber crawler, where A is a plan view and B is a sectional view.

[Explanation of symbols]

1, 11, 21, 31 Core bar 2, 12, 22, 32 Engaging part 2a, 22a, 32a Rib 2p, 22p, 32p Recessed part 3, 4, 13, 14, 23, 24, 33, 34 Corner part 13k, 14k, 23k, 24k, 33k, 34k inclined surface 5,15,25,35 wing portion 26 engaging hole

Claims (4)

[Claims] 1. A mandrel for a rubber crawler, wherein a sprocket engaging portion is provided in the center, corners are provided on both outer sides of the engaging portion, and wing portions extending to the left and right are provided on both outer sides of the engaging portion. The core bar for a rubber crawler according to claim 1, wherein the engaging portion is formed with a concave portion which is divided vertically and horizontally by a rib. 2. The left and right corners have a zigzag shape extending in opposite directions before and after the core metal, and the edge portions on the opposite side to the corner extending side are in a defective state. The core metal for a rubber crawler according to claim 1. 3. A mandrel for a rubber crawler, wherein a sprocket engaging portion is provided in the center, corners are provided on both outer sides of the engaging portion, and wing portions extending to the left and right are further provided on both outer sides of the engaging portion. In the above, a core bar for rubber crawlers is characterized in that the opposing inner surfaces of the left and right corner parts are formed into inclined surfaces which are inclined at a constant angle toward the core bar wing side in a top view. 4. A mandrel for a rubber crawler, which is integrally formed by providing a sprocket engaging portion at the center, corner portions on both outer sides of the engaging portion, and wing portions extending left and right on both outer sides thereof. In the above, the engaging portion is formed with a concave portion which is divided vertically and horizontally by a rib, and the inner surfaces of the left and right corner portions facing each other are formed as inclined surfaces inclined at a constant angle toward the core bar wing side in a top view. A metal core for rubber crawlers.