JP4563656B2 - Rubber crawler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a new structure of a rubber crawler, and more particularly, to a rubber crawler provided with a countermeasure against an ear cut that occurs during running of the rubber crawler.
[0002]
[Prior art]
As is well known, a rubber crawler has an endless rubber elastic body in which a core metal is embedded at a constant pitch in the longitudinal direction, and a steel cord is embedded so as to surround the core metal. A rubber lug is formed at a constant pitch on the outer peripheral side of the rubber elastic body. Such a rubber crawler is wound around a driving wheel and an idler wheel provided in the vehicle, and a wheel provided in the meantime, and is used as a traveling part of the vehicle.
[0003]
[Prior art]
8 is a plan view of the inner peripheral side of a typical rubber crawler 11, FIG. 9 is a plan view of the outer peripheral side thereof, FIG. 10 is a sectional view taken along line aa, 12 is a rubber elastic body, and 13 is a core. Gold, 14 is a steel cord, and 15 is a rubber lug. The cored bar 13 is generally composed of an engaging part 13a with a driving wheel at the center, a wing part 13b on the left and right sides thereof, and a pair of protrusions 13c protruding from the inner peripheral surface of the rubber elastic body 12. The wing 13b is embedded in the rubber elastic body 12 in the width direction. The steel cord 14 is embedded in the rubber elastic body 12 with the left and right wings 13b surrounded from the outside.
[0004]
However, when the rubber crawler 11 is used for traveling, it is repeatedly carried on or rubbed against a curb stone 20 on the road surface, a stone protruding from the road surface, or the like as shown in FIG. In this case, the left and right edge portions 11a of the rubber crawler 11 collide with or be rubbed against the curbstone 20 or the like. At this time, Gomukuro - left and right edge portions 11a of La 11 to the site where the site and core metal 13 the tip 13b ₀ is approaching extremely right and left wing portions 13b of the core 13 does not exist at all is present alternately Become. Of course, the metal core 13 is made of metal, and therefore, the left and right edge portions 11a of the rubber crawler 11 have alternatingly soft portions 11A and highly rigid portions 11B.
[0005]
For this reason, when the rubber crawler 11 rides on or comes into contact with the curbstone, the relatively soft portion 11A where the metal core 13 does not exist makes the rubber crawler 11 easy to bend. Although the move easily rides against curb portion 11B of the wing tip 13b ₀ of the metal core 13 is present in the vicinity thereof high rigidity, since it is difficult bending, Gomukuro - edge 11a of La 11 decent collision The state to be repeated is repeated. This Gomukuro between the blade tip 13b ₀ and curb 20 of the metal core 13 - a state in which edge 11a of La 11 is interposed, become that this site is repeated that is forced bent In other words, the so-called ear cut of the rubber crawler 11 occurs.
[0006]
[Problems to be solved by the invention]
Therefore, in the initial stage of the occurrence of the above-mentioned ear cutting, the rubber located at the tip 13b ₀ of the wing part of the core metal 13 cracks and becomes a defect of the rubber, or grows in the longitudinal direction of the rubber crawler 11 and becomes an ear cutting. Will come. The present invention relates to such an improvement of the prior art, and aims to prevent the occurrence of an ear break.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and the gist thereof is that a core metal is embedded in a strip shape with a constant pitch in the longitudinal direction in an endless rubber elastic body. A rubber crawler with a steel cord embedded and a rubber lug formed at a constant pitch on the outer periphery of the rubber elastic body, and the edge of the rubber elastic body located outside the ends of the left and right wings of the core metal The rubber elastic body is removed so that the portion (A) is located 5 to 15 mm inside the edge (B) of the rubber elastic body between the core bars, so that a so-called step is formed, and the core metal is embedded The position is overlapped with a rubber lug formed on the outer peripheral side of the rubber elastic body, and both end portions of the rubber lug reach the edge portion (A), respectively.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, in the edge part of the rubber crawler, the flexibility is greatly different between the part where the wing tip of the core bar is near and the part between the core bars. Are significantly different. In particular, the portion (A) where the wing tip of the core metal is close behaves such that the core metal and the curbstone directly collide and rub against each other, so the rubber elastic body covering the wing tip of the core metal has a shearing force. In particular, because of this, cracks are likely to occur in the rubber part.
[0010]
In the present invention, the rubber part (A) which is easily cracked is to be positively removed in advance, and in the case where the rubber crawler runs on the curb, The curb in contact with the edge (B) of the la does not contact the edge (A), and does not give much shearing force to the rubber part even if contacted, and the next edge (B) will be contacted and this is repeated. As described above, the edge portion (B) is located far from the tip of the wing portion of the core metal, and is relatively flexible. Therefore, the edge portion (B) rides up so as to wrap up the curbstone, and the rubber elastic body There is no bending fatigue.
[0011]
In addition, as a structure having a notched edge portion of the rubber crawler, there is Japanese Utility Model Publication No. 56-157181, etc., as shown in FIG. 12, between the lugs 15 (relatively soft parts (11B ))), And the curbstones or the like protrude right and left (relatively hard part (11A)) and collide with the lug 15, causing the lug 15 to bend and cracking from this part. The occurrence of this is relatively fast. As described above, the above example is an invention based on an idea completely different from the technical idea of the present invention.
[0012]
【Example】
Hereinafter, the first example of the rubber track 1 of the present invention will be further described with reference to the drawings. 1 is a plan view of the inner side of the rubber crawler, FIG. 2 is a plan view of the outer side, and FIG. 3 is a cross-sectional view taken along line AA. In the figure, 2 is a rubber elastic body that forms the base of a rubber track, and 3 is a metal core. Such metal core 3 is engaging portion 3a of the driving wheels in the center, and which has a pair of projections 3 ₀ projecting from the inner circumferential surface of the rubber elastic body 2 is provided across this more to the right and left wings A portion 3b is formed, and is embedded in the rubber elastic body 2 in a strip shape with a constant pitch. The steel cord 4 is embedded so as to surround the wing portion 3b. In this example, the rubber lug 5 formed on the outer peripheral surface of the rubber elastic body 2 is formed by overlapping the core metal 3 in a single character shape.
[0013]
In this rubber crawler, since the core metal 3 and the rubber lug 5 overlap each other, the rigidity of this portion is particularly high. However, the edge portions (A) on the left and right sides of the lugs 5 are positioned inside the edge portions (B) between the core bars 3 (between the lugs 5 in this example). Of course, in this example, so that the edge of the outer rubber elastic body of the left and right wing tip 3b ₀ of the core 3 (A) from inside the other site (B).
[0014]
For this reason, as shown in FIG. 4, a particularly rigid part (A) reaches the next edge part (B) with almost no contact with the curb stone 20, and the edge part (B ) Is relatively soft and has no special effect on the curb shear force. On the other hand, in the conventional rubber crawler in which the edge portions (A) and (B) are similarly formed without irregularities, the rubber elastic body at the edge portion (A) has a large shear as shown in FIG. The force is repeatedly applied, and the occurrence of cracks in the rubber (A) at this site is inevitable.
[0015]
FIG. 5 is a second example of the rubber track 1 of the present invention, and is a plan view of the outer peripheral side similar to FIG. In this example, the rubber lugs 5 are formed by alternately arranging long and short lugs, and in the long lugs 5a, the left and right ends of the lugs 5a are located inside the edge (B) of the rubber elastic body. are those obtained by, in the short lugs 5b, it is obtained edge end portion of the rubber elastic body edge side of the left and right wing tip 3b ₀ of the core from the (B) is positioned on the inside.
[0016]
FIG. 6 is a third example of the rubber crawler 1 of the present invention, and is a plan view on the outer peripheral side similar to FIG. In this example, the rubber lugs 5 are not parallel to the core metal 3 but are alternately formed in a letter C shape. So that the object can be achieved by positioning edge end portion corresponding to the blade tip 3b ₀ high cored bar 3 the most rigid as shown even in this example (A) on the inside.
[0017]
FIG. 7 is a fourth example of the rubber crawler 1 of the present invention, and is a plan view on the outer peripheral side similar to FIG. In this example, by way of example Gomuragu 5 are formed straddling two core metal 3, corresponding to the blade tip 3b ₀ most highly rigid metal core 3 as shown also in this example The edge part (A) which was made is located inside.
[0018]
In the above example, specifically, the dimension between the wing tip 3b ₀ of the core 3 and the edge (A) of the rubber elastic body is, for example, 10 mm, and is between (B) and (A). The step was 10 mm.
[0019]
【The invention's effect】
The present invention is as described above, and in the conventional rubber crawler, stress is concentrated on the tip of the wing portion of the core metal when riding on the curbstone or rubbing, and the rubber elastic body located on the outer side is rubber However, in the present invention, a step is positively provided in the rubber at such a site, and thereby concentration of stress can be avoided, and the above-mentioned drawbacks are eliminated.
[Brief description of the drawings]
FIG. 1 is a plan view of an inner peripheral side showing a first example of a rubber track of the present invention.
FIG. 2 is a plan view of the outer periphery side of FIG.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a conceptual diagram showing a relationship with a curbstone.
FIG. 5 is a plan view of the outer peripheral side showing a second example of the rubber track of the present invention.
FIG. 6 is a plan view of the outer peripheral side showing a third example of the rubber track of the present invention.
FIG. 7 is a plan view of the outer peripheral side showing a fourth example of the rubber track of the present invention.
FIG. 8 is a plan view of the inner peripheral side of a typical rubber crawler.
FIG. 9 is a plan view of the outer periphery of the rubber track of FIG. 8;
10 is a cross-sectional view of the rubber track of FIG. 8 taken along line aa.
FIG. 11 is a view showing a relationship between a conventional rubber crawler and a curbstone.
FIG. 12 is a view showing another example of a conventional rubber track.
[Explanation of symbols]
1. The rubber track of the present invention,
2. Rubber elastic body,
3. Core metal,
4. Steel code,
3a ... engaging portion of the cored bar with the drive wheel,
3b ... core wings,
3b ₀ ... the tip of the core wing,
5, 5a, 5b ... rubber lugs,
20. Curb,
A ... The edge part of the rubber elastic body at the tip of the wing part of the cored bar,
B ... Edge of rubber elastic body between core bars.

Claims (1)

A cored bar is embedded in a strip shape with a constant pitch in the longitudinal direction in an endless rubber elastic body, and a steel cord is embedded surrounding the cored bar, and a rubber lug is fixed on the outer peripheral side of the rubber elastic body. A rubber crawler formed with
Rubber elasticity so that the edge part (A) of the rubber elastic body located outside the tips of the left and right wing parts of the metal core is located 5 to 15 mm inside the edge part (B) of the rubber elastic body between the metal cores. The body is removed ,
The embedded position of the core metal is overlapped with a rubber lug formed on the outer peripheral side of the rubber elastic body,
A rubber crawler characterized in that both ends of the rubber lug reach the edge (A).

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