Safety tire

Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube

Patent

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Details

152517, 152555, B60C 300, B60C 1700

Patent

active

052996158

ABSTRACT:
The present invention relates to a run-flat tire comprising an inner sidewall disposed on an axially inner curved face of the carcass in each sidewall portion, the inner sidewall tapered to have a crescent cross-sectional shape, the radius of the curvature of a primary portion of the axially inner face being 0.30 to 0.50 times the tire section height, the total thickness of each sidewall portion satisfying the following conditions: 0.18.ltoreq.x/H.ltoreq.0.34; y<x; 300<(x+y).sup.yx/y .ltoreq.450, wherein x equals the total thickness (mm) measured along a straight line drawn normal to the carcass from the axially outer edge of the radially innermost belt ply; y equals the total thickness (mm) measured at the maximum section width point at which the cross section width of the tire is maximum; H equals the section height of the tire. The inner sidewall is made of rubber consisting of 100 parts by weight of a rubber compound, 40 to 60 parts by weight of carbon black whose particle diameter is 70 to 50 nano-meters, and 3 to 8 parts by weight sulfur, wherein the rubber compound consists of 50 to 80 parts by weight of polybutadiene which includes 1,2-polybutadiene at not less than 75 weight % and whose crystallization is not more than 10%, and 20 to 50 parts by weight of at least one kind of rubber selected from polyisoprene rubber, styrene-butadiene rubber, cis-1,4-polybutadiene rubber and halogenated butyl rubber.

REFERENCES:
patent: 4326576 (1982-04-01), Mizumoto et al.
patent: 4365659 (1982-12-01), Yoshida et al.
patent: 4779658 (1988-10-01), Kawabata et al.
patent: 4824899 (1989-04-01), Yasuda
patent: 4917164 (1990-04-01), Ushikubo et al.
patent: 5058646 (1991-10-01), Kajikawa et al.

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