JP3432938B2 - Rubber crawler - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler suitably used for construction machines and civil engineering machines. 2. Description of the Related Art Conventionally, as a traveling unit of a construction machine or a civil engineering machine, an iron scroll has been used.
In recent years, rubber crawlers have come to be used favorably. However, rubber crawlers are less rigid than iron crawlers.
There is a major drawback that it is easy to come off. For this reason, it is conceivable to increase the width of the core bar embedded in the rubber crawler. However, in this case, the pitch between the core bars will be different, and the sprocket provided on the traveling portion will not be engaged. . An improvement in this respect is disclosed in Japanese Patent Laid-Open No. 1-2082.
No. 84. This is a rubber lug formed by laying two cores buried in rubber over the rubber bar.
This is to increase the rigidity of the rubber. FIG. 4 is a plan view on the outer peripheral surface side of this conventional rubber crawler. In the drawing, reference numeral 11 denotes a rubber elastic body which is continuous in an endless manner in the vertical direction. A core bar 12 is embedded in the rubber elastic body 11 in a short shelf shape at a constant pitch.
Rubber lug 1
3 and 13 are provided alternately. And core metal 1
A sprocket engagement hole 14 is continuously formed at the center between the two. The rubber lugs 13, 13 of the rubber crawler
Is provided so as to straddle the adjacent metal cores 12, 12, so that the rigidity of the rubber crawler is increased, and the phenomenon of the rubber crawler coming off the traveling portion is reduced. Things. [0005] However, it is a fact that such a rubber crawler still has points to be improved. That is, when the rubber crawler is stretched between the idler wheel and the drive wheel, it is necessary to adjust the tension of the rubber crawler between the two wheels. Usually, the tension is adjusted by sliding the idler wheel back and forth. It is supposed to be. [0006] In the rubber crawler having the lug arrangement described above, the circumference of the rubber crawler can be originally set to only an even multiple of the embedding pitch of the core metal, so that the rubber crawler cannot be mounted between the two wheels or can be mounted. However, there are many cases where the adjustment amount of the tension is too large to adjust the tension, and the matching with the machine traveling part often occurs. The present invention has been made in order to improve such a drawback. In the present invention, an odd number of metal cores are buried in a rubber elastic body, and an irregular lug arrangement section is provided within a certain range. It becomes. [0008] For the above purpose, the rubber crawler of the present invention has the following constitution. That is,
The gist of the present invention resides in that an odd number of metal cores 2 are buried at a constant pitch in a rubber crawler main body, and a rubber lug a is arranged in a right and left direction in the width direction of the rubber crawler and straddles adjacent metal cores 2. Two virtual planes P ₁ , P ₂ surrounding an odd number (n ≧ 3) of the metal cores _2.
The drawing, the lugs a ₀ facing the virtual plane P _1, P ₂ extends beyond the imaginary plane, the n-number of Gomuragu b similar shape with the Gomuragu a between the virtual plane P _1, P ₂ Gomuragu a, the rubber lugs b are arranged in an overlapping manner as viewed from the side of the rubber crawler, and the imaginary planes P ₁ and P ₂ are endless vulcanized connections. The present invention relates to a rubber crawler having a surface. In a conventional rubber crawler of this type, two cores form one pair because of the two cores.
The adjustment of the circumferential length of the roller is an adjustment having a length corresponding to two cores, and the case exceeds the interval between the drive width and the idle width and the length adjustment range of the tension adjusting device. Are scattered. However, the present invention is provided for a case in which it is difficult to adjust the length of the entire length. In this case, the number of cores used is an odd number, and the odd number (n) of the cores is used.
≧ 3) rubber rugs b similar to the original rubber rugs a are arranged substantially evenly, and the rubber rugs b have a width which overlaps when viewed from the side. The rigidity as a whole does not change so much, the rigidity of the rubber crawler is increased, and the rubber crawler has an ability to prevent the rubber crawler from coming off from a sprocket or the like. . The arrangement portion of the rubber lug b, that is, the virtual surface, is a portion which is usually formed by abutting and re-vulcanizing an end-like rubber elastic body having a rubber lug a portion. And vulcanization is carried out by filling the surroundings with unvulcanized rubber and providing a cavity for forming a rubber lug b in a molding die surrounding this portion in advance. can do. Since the rubber lug a is formed beyond the recured connection surface (virtual surface), the strength of the rubber crawler as a molded product is increased.
The number of metal cores n in the rubber lug b may be an odd number, but usually 3 or 5 is preferable in terms of handling, and the continuity of rubber lugs a and b (equalization of rigidity) as a whole rubber crawler. This is preferable in that respect. Hereinafter, the present invention will be described in more detail with reference to examples. FIG. 1 is a plan view from the rubber lug side in a first embodiment of the present invention, and FIG. 2 is a side view thereof. In this example, the number of metal cores corresponding to the rubber lugs b in the region B sandwiched between the virtual surfaces P ₁ and P ₂ is five. In the figure, reference numeral 1 denotes a rubber elastic body constituting a rubber crawler, which is continuously endless in a vertical direction. The core 2 is embedded in the rubber elastic body 1 at a constant pitch. Reference numeral 3 denotes a sprocket engagement hole. In the area A of the rubber elastic body 1, the rubber lugs a are alternately formed on the rubber elastic body 1 while being distributed right and left over the adjacent metal cores 2, 2. The rubber lugs a are formed by being distributed over substantially the entire length (region A) of the rubber crawler. As can be seen from the drawing, adjacent lugs a, a, which are alternately distributed, are overlapped when viewed from the side, as in the case of the above-described conventional technique, thereby reducing the rigidity of the rubber crawler. Up is planned. In the area B of the rubber elastic body 1, five cores 2 are buried. If the rubber lugs a are arranged as they are, the core 2 Is an odd number, the arrangement relationship described above is not possible, and instead of increasing the rigidity of this part, extremely rigidity is extremely increased, or conversely, there is a part with extremely low rigidity, and this part has When the load is concentrated, the rubber elastic body is cut or the rubber is chipped, thereby shortening the life of the rubber crawler. According to the present invention, however, in the region B, the rubber lugs b having the same number of cores (five) as the rubber lugs a slightly smaller than the rubber lugs a described above are used.
The rubber lugs a are arranged in the same order as the rubber lugs a provided in the area A, and when viewed from the side, the rubber lugs b also overlap, thereby increasing the rigidity of the rubber crawler. In addition, the lugs (a, b) having substantially the same shape are continuously formed as a whole rubber crawler, so that a smooth bending rigidity can be obtained. The top is also excellent. In the first embodiment, the virtual plane P ₁ ,
With P ₂ is obtained by an endless vulcanization connecting surface, be one vulcanization molding the A region first, and then vulcanizing the B zone, not shown tension member (steel - Turkey - de) Are stacked at this portion, and a rubber material is filled in a mold for forming this portion and vulcanized to obtain a rubber crawler. The rubber lug facing this connection surface extends beyond the connection surface and the rubber lug a ₀
Therefore, it serves to protect and strengthen the recured surface (connection surface). FIG. 3 is a plan view of a rubber lug according to a second embodiment of the present invention. In this example, the virtual planes P ₁ , P
Between the _two (region B), rubber lugs b are arranged at three cored bar portions 2, and the rubber lugs a and b have tips slightly inclined to one side. In this case, of course, the number of rubber lugs b allocated to the region B is three, and the virtual surfaces P ₁ and P ₂
Gomuragu a ₀ that faces the is formed across this addition to the virtual plane P _1, P ₂ as in the example. Of course, these rubber lugs a (a
₀ ) and b are, of course, overlapped when viewed from the side. According to the present invention having the above-described structure,
Not only the rigidity of the rubber crawler is increased, but also the mountability to the traveling section is improved, and it is particularly convenient when replacing and using the iron crawler.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view from the rubber lug side of a rubber crawler in a first embodiment. FIG. 2 is a side view of a rubber crawler in FIG. 1; FIG. 3 is a plan view from the rubber lug side of a rubber crawler in a second embodiment. FIG. 4 is a plan view from the rubber lug side of a conventional rubber crawler. [Description of Signs] P ₁ , P _{2 、} virtual surface, a, a ₀ , b ‥‥ rubber lug, 1 ‥‥ rubber elastic body, 2 ‥‥ core bar, 3 ‥‥ sprocket engagement hole.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B62D 55/253

Claims (1)

(57) [Claims] [Claim 1] An odd number of metal cores 2 are buried at a constant pitch in a rubber roller main body, and the metal cores adjacent to each other are divided into right and left in the width direction of the rubber roller. 2 is a rubber crawler provided with a rubber lug a, and the rubber crawler is provided with two virtual surfaces P ₁ and P ₂ surrounding an odd number (n ≧ 3) of the metal cores _2. the lug a ₀ facing the _1, P ₂ extends beyond the imaginary plane, with an array of the same order of the Gomuragu a n number of Gomuragu b similar shape with the Gomuragu a between the virtual plane P _1, P ₂ The rubber lugs b are formed so as to be divided into right and left, and each rubber lug b is arranged in an overlapping manner when viewed from the side of the rubber crawler, and the virtual surfaces P ₁ and P ₂ are endless vulcanized connection surfaces. Rubber crawler.