Light weight pneumatic tire having a thin side wall rubber
AssigneeBridgestone Tire Company Limited
InventorsYoichi Kitazawa, Takeshi Sato, Hisao Tsuji
Life of this patent
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Abstract
A light weight pneumatic tire having a thin side wall rubber is disclosed. The thin side wall rubber has previously been squeezed on that region of the outer surface of an upper ply which corresponds to the side wall portion of the tire prior to the tire shaping step and possessed of a Shore A hardness after vulcanization of 40.degree. to 55.degree., an excellent flex-cracking and weather resistant property. The upper ply is superimposed about at least a portion extending from a hump portion to a bead portion of the tire and composed of cords coated with a high resilient rubber. A tread rubber layer is extended across the thin side wall rubber layers and pressed and made integral therewith by stretching.
Claims11
A light weight pneumatic tire having a thin sidewall rubber, comprising a bias laid carcass ply composed of cords angularly disposed with respect to the circumferential direction of the tire and extending from one of a pair of bead portions through a crown portion to another bead portion, a breaker layer superimposed about the crown portion of said carcass ply, an upper ply disposed on said carcass ply and extending from the bead portion to at least an edge of the crown portion and maintaining an overlapping relation with the breaker layer, said upper ply being composed of cords crossed to the cords of the carcass ply symmetrically with respect to the circumferential direction of the tire, and a thin rubber layer disposed on the outer surface of said upper ply and having a thickness of 0.5 to 3.0 mm and a Shore A hardness after vulcanization of 40.degree. to 55.degree..
Dependencies are inferred from the claim text.