JPS5843801A - Solid tire - Google Patents

Abstract

PURPOSE:To simplify the production and to improve the wear resistance, by composing a solid tire of a toroidal outer skin section made up of a specified composition and a core of a polyurethane elastomer that is filled in the bore of the toroidal skin section. CONSTITUTION:The solid tire 1 is composed of the toroidal skin section 2 and the core 3 of a polyurethane elastomer that is filled in the bore of the skin section, which skin section 2 is made up of a composition including 10-90wt% powder rubber (e.g. a dien rubber having a particle size of 20-60 mesh) that are mixed with a polyurethane elastomer. As the core, use is made of a polyurethane elastomer having a JIS hardness in the range of 30 deg.-50 deg.. Thus, the comfortableness to drive and the durability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an industrial solid tire that is easy to manufacture and has excellent wear resistance, ride comfort, and durability.

Conventionally, solid tires are produced by injecting urethane raw materials into a mold and curing them in one reaction to form a toroidal urethane casting tire or by filling the inner cavity formed by the rim and tire outer skin of a pneumatic tire with polyurethane elastomer. Integrated so-called polyurethane traction tires have been proposed. The former has excellent wear resistance, but has the drawbacks of high rigidity of the tire itself, which impedes ride comfort, and high raw material costs.The latter also has the disadvantage of having a very complex outer skin structure, making it difficult to manufacture. It has the disadvantage that it is time consuming. The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide an industrial solid tire that is easy to manufacture and has excellent wear resistance, riding comfort, and durability. Fig. 1 shows a cross-sectional view of the solid tire of the present invention. In the figure, the solid tire (1) of the present invention! It consists of a toroidal outer skin part (2) and a polyurethane elastomer core (3) filled in its inner cavity, - the said outer skin part (2) is made of polyurethane elastomer from powdered rubber weighing 10^90% by weight. Consists of mixed compositions. ``Here, the powdered rubber used is Bien Thai rubber with a 20-6.0 mesh. If a powdered rubber smaller than a 2o mesh is used, air bubbles will be trapped in the liquid when the powdered rubber is dispersed in the urethane raw material, making it difficult to remove the air bubbles, resulting in non-uniformity, and the strength after vulcanization will be reduced. Polyimrene rubber, polybutadiene rubber, styrene-butadiene rubber, etc., or mixtures thereof, and vulcanizates of these are usually used.

The diene rubber may contain fillers used in tire treads, such as carbon, oil, and sulfur. Outer skin part (2>'
+4 By mixing diene rubber powder into polyurethane elastomer, toma, and -, it maintains the same wear resistance and purity of diurethane elastomer alone as the diurethane elastomer alone.-1 Durability and maintains rubber elasticity. The ride comfort can be further improved. Therefore, if the powdered rubber is less than 10% by weight, the effect will be 5 flaws by weight and 90% by weight, and if it exceeds 90% by weight, the wear resistance will be good.

'Durability is significantly reduced. Preferably powdered goose [ha 20
-60% by weight range, selected by weight.

Next, the polyurethane part Ranu that appears in middle-f: (3).

Tomer is used to add rubber elasticity to the tire itself.

It is desirable to use tires with a J-Tech SA hardness in the range of 3o-, -, soo. The ride comfort, which is a drawback of the previous model, has been improved.

Furthermore, it is desirable that the polyurethane elastomer used for the core has a resilience of 50% or more to reduce heat generation during running.

Next, the solid tire manufacturing method of the present invention is described in the third aspect. A space (7) is formed by an outer mold (5) and an inner mold (6) for forming the outer skin, which are divided into two parts shown in Figure 3 and fitted together. A ring type s8) is placed on the side. In addition, an injection port (a river and an exhaust hole U) for injecting the 50% urethane raw material is provided in the A-type (5).

Then, the urethane raw material is injected from the injection port (-) into the space (7) corresponding to the shape of the outer skin material of the retireer.
Reactively cures at room temperature or under heat. Outer mold after curing (S) S
By removing the outer shell (6) and the ring mold (8), the tire outer skin shown in FIG. 2 is formed.

After that, the outer skin of the tire was attached to the rim, and the urethane raw material for forming the core was injected into the inner cavity formed by the outer skin and the rim through the air valve attached to the rim, and the reaction was carried out at room temperature or under heating for 5 times. harden. As shown in FIG. 1, there is a skin part on the rim (9).

A solid tire is obtained which is equipped with (2) and is integrally filled with a polyurethane elastomer core. In addition to the above-described method, the present invention may also adopt a method in which the core is molded in advance and then the outer skin is integrally molded on the outside of the core.

° As mentioned above, the solid tire of the present invention has a wear resistance of T4. In addition to being superior in durability, it also has rubber elasticity, which further improves riding comfort. Moreover, since no reinforcing materials such as carcass or punker are used in the outer skin,
Complicated work is omitted, shortening the process and saving labor, which improves performance. .

[Brief explanation of drawings]

FIG. 1 is a sectional view of the solid tire of the present invention. FIG. 2 is a partial perspective view of the outer skin, and FIG. 3 is a sectional view of the molding machine. Patent applicant: Sumitomo Rubber Industries, Ltd. Agent Patent Attorney Yoshihira Nakamura・1shi II゛4 Figure 2 Figure 3

Claims (3)

[Claims] (1) It consists of a polyurethane elastomer core filled in the inner cavity formed by the toroidal outer skin and the outer skin and the rim, and the outer skin is made of polyurethane rubber containing 10-90% by weight of powdered diene rubber. A safety tire characterized by being composed of a composition mixed with an elastomer. (2) The solid tire according to claim 1, wherein the powdered rubber is made of 20-60 mesh. (3) The solid tire according to claims 1 to 3, which is a core (a polyurethane elastomer with a hardness in the range of 30 to 500).