JPH0620718Y2 - Elastic track for crawlers - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an elastic crawler track for a high load crawler used in snow vehicles, underwater traveling robots and the like.

[Conventional technology]

2. Description of the Related Art Conventionally, elastic crawler belts, which are integrally molded into a rubber belt, have been widely used as crawler for traveling vehicles mainly on wetlands and snowy surfaces, instead of a metal crawler in which steel crawler elements are connected endlessly.

The elastic crawler track for this type of crawler has various advantages as compared with those made of steel, such as less danger of corrosion, significantly less noise, and easier maintenance and inspection. Widely used for work vehicles (for example, No. 58-107981 and No. 61-1188).
84, 63-52677, etc.).

[Problems of conventional technology]

However, the crawler elastic crawler belt has stress concentration on the belt-side mounting portion of the projecting plate which is projected on the surface, and moreover, it is large in the belt main body during traveling due to the biting angle to the soft base surface of the projecting plate. A compressive or tensile stress is applied, and as a result, the belt is cut from the mounting corner portion of the cross plate, and there is a problem that the service life ends relatively early.

Therefore, there is a problem that it cannot be used for a long time under a heavy load use condition such as a snow vehicle or an underwater traveling robot.

[Problems to be solved by the device]

In consideration of the above problems, the present invention, even under high load use conditions,
The purpose of the present invention is to provide an elastic crawler track for a crawler, which is capable of imparting sufficient durability and, in particular, is imparted with compressive and tensile strengths at the mounting base of the crosspiece.

[Technology that has solved the problem]

That is, the elastic crawler track of the present invention is formed by laminating a reinforcing cloth on one or both sides of the tensile band layer via a rubber layer, and a surface protective rubber layer is integrally laminated on the surface of the reinforcing cloth as required. , The reinforcing cloth has a twisting factor of 700-150
0, a warp yarn having a double twist as the upper twist 1000 to 2100 is used as a constituent yarn, and the warp yarns are laminated along the length direction of the tensile body.

[Action]

In the present invention, the elastic crawler belt is made of a tension material similar to that of the conventional rubber belt (polyester, polyamide fiber, etc.) or rubber material (N.
R, SBR, etc.) is used, but as a reinforcing cloth integrally laminated for surface reinforcement, the twist coefficient (K) of the warp is twisted under
Reinforcing cloth is used that has a twist of 0 to 1500 and double twist of 1000 to 2100 as the constituent yarn.

Here, the twist coefficient (K) is the number of twists per 10 cm, which is T (T
/ 10cm), D is a constant length yarn count (denier), The larger the value of K, the more the twist. The more the twist, the tighter the yarn and the more the compression fatigue resistance.

In addition, twin twist means that one or more yarns are aligned and twisted to make a lower twist, and two or more yarns to which this lower twist is applied are gathered and twisted in the opposite direction to the lower twist. Say what is given and twisted.

Therefore, the compression fatigue resistance of the warp yarn is further improved by the double twist of the lower twist and the upper twist.

Further, as the number of twists, the reason why the lower twist is 700 to 1500 is that if it is less than 700, sufficient compression fatigue resistance cannot be given in relation to the later-described upper twist, and if it is more than 1500, it is normal. In the twisting machine, the snare phenomenon occurs and the twisting process becomes difficult.

Also, the reason for setting the upper twist to 1000 to 2100 is that if it is less than 1000, the compression fatigue resistance of the reinforcing cloth is not sufficient, and if it is more than 2100, the density increase of the yarn due to the twist of the lower twist and the stiffness increase. The twisting of the twist becomes difficult, and the compression fatigue resistance does not improve much in spite of this difficulty, so it is not significant.

Since the reinforcing cloth woven with the above-mentioned constituent threads has a strong compression fatigue resistance in the constituent thread direction, the compressive fatigue resistance on the front and back surfaces of the elastic crawler track for crawlers is remarkably improved, and the tensile body is combined. Therefore, the strength of the entire crawler belt can be improved.

〔Example〕

 Next, an embodiment of this invention will be described.

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention, and FIG.
The II-II line expanded sectional view of a figure is shown.

As shown in Table 1, the tensile body 1 is made of nylon ply cloth having a tensile strength of 300 kg / cm and 4 plies, and rubber layers 2 and 2 having thicknesses of 0.3 mm and 2.0 mm are provided on both sides of the tensile body 1. Reinforcing cloths 3 and 3 having twisted and twisted constituent yarns as warp yarns 3A
3 A of warp yarns are laminated along the length direction (arrow X) of the crawler belt A, and rubbers having thicknesses of 0.2 mm and 2 mm are further laminated as the surface rubber layers 4 and 4, and the elastic crawler track for crawlers by heat compression vulcanization. I got A.

The reinforcing cloths 3 and 3 have a warp yarn of nylon yarn having a thickness of 1260 denier, which is twisted into two twisted yarns and twisted into two twisted yarns. For 3B, three nylon threads having a thickness of 1260 denier were combined and twisted, and a density of 23 threads per 5 cm was used. While applying a tension of 1/16 of the ultimate tensile strength to the elastic crawler track A for the crawler obtained in the above-mentioned embodiment, the roller C having the protrusion B as shown in FIG. Then, the residual strength of the crawler belt A after that was measured.

The results are shown in the right column of Table 1.

[Effects] As described above, according to the present invention, since the front and back surfaces of the footwear exposed to severe conditions are reinforced by the reinforcing cloth along the length direction when used as a crawler, As is clear, 15 is around the upper limit of the number of twisted yarns (K).
It shows an extremely high residual strength retention rate of 80 to 90% after 10,000 bending tests, and exhibits sufficient durability even for vehicles with severe load conditions such as snowmobiles and underwater traveling robots, which are subject to loading by a slab.

[Brief description of drawings]

1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of FIG.
II-II line expanded sectional view, FIG. 3 is explanatory drawing of a test apparatus.

Claims (1)

[Scope of utility model registration request] 1. A reinforcing cloth is laminated on one side or both sides of a tensile band layer with a rubber layer interposed therebetween, and a surface protective rubber layer is integrally laminated on the surface of the reinforcing cloth, if necessary. ,
A warp yarn having a twisting factor of 700 to 1500 for the lower twist and 1000 to 2100 for the upper twist is given as a constituent yarn, and the warp yarns are laminated along the length direction of the tensile body. Elastic track for crawlers.