Pneumatic safety tires

Abstract

A pneumatic tire comprising a cylindrical tread, a pair of sidewalls, bead rings, a radial carcass, rubber fillers each arranged between each turn-up portions and a main body of the carcass and extending from above the bead ring toward the tread portion such that the radially sectional shape of the rubber film becomes narrower toward the tread portion, and a pair of thick rubber reinforcement layers arranged on respective axially inner sides of the carcass in the sidewall portions. Each of the rubber reinforcement layers is constituted by first and second reinforcing rubber layers, the first reinforcing rubber layer occupying a radially outer side of the sidewall portion and the second reinforcing layer being continued to a radially inner side of the first reinforcing rubber layer through an inclined joint surface and arranged on radially outer side of the rubber filler through the main body of the carcass, Shore A hardness of the rubber reinforcement layer is made greater in the order of the first reinforcing rubber layer, the second reinforcing rubber layer and the rubber filler, and the rubber volume of the reinforcing rubber reinforcement layer is made greater reversely in the order of the rubber filler, the second reinforcing layer and the first reinforcing layer.