Patent ID: 6609550
Filing Date: 2003-08-26
Classification: B60C,Y10T

Abstract:
A runflat pneumatic tire comprisinga tread portion, a pair of sidewall portions, a pair of bead portions each with a bead core and a bead apex therein, the bead apex made of rubber extending radially outwards from the bead core, a carcass extending between the bead portions and composed of an inside carcass ply and an outside carcass ply, the inside carcass ply extending between the bead portions through the tread portion and sidewall portions and turned up around the bead core in each bead portion from the inside to the outside of the tire so as to form a pair of turned up portions and a main portion therebetween, the outside carcass ply disposed outside the inside carcass ply and extending to a position between the bead apex and the turned up portion in each bead portion, each bead portion provided with a steel cord reinforcing layer comprising an axially inner portion and an axially outer portion which extend radially outwardly from the underside of the bead core along the axially inside and outside of the bead core, respectively, each sidewall portion provided with an axially inner reinforcing rubber layer and an axially outer reinforcing rubber layer, the axially inner reinforcing rubber layer disposed along the axially inner surface of the main portion of the inside carcass ply, the axially outer reinforcing rubber layer disposed between the outside carcass ply and the axially outer portion.