Patent ID: 6263935
Filing Date: 2001-07-24
Classification: B60C,Y10T

Abstract:
A radial ply runflat pneumatic tire capable of being used in the uninflated condition having an axis of rotation, a tread having a pair of lateral edges, a pair of reinforcing belts located radially inward of the tread, a pair of sidewalls, one sidewall extending radially inwardly from each lateral edge, a maximum section width, and a tire carcass structure, the tire carcass structure comprising:a) a pair of bead portions, one bead portion extending radially inwardly from each sidewall, each portion including a substantially inextensible core;b) a carcass reinforcing structure radially inward of the reinforcing belts extending circumferentially about the tire from one bead portion to the other bead portion, the carcass reinforcing structure having a first ply structure and a second ply structure, each ply structure having at least one ply, each ply structure having an elastomeric ply coat and ply cords which extend from bead to bead;c) an innerliner radially inward of the first ply structure;d) an aramid cord reinforced overlay being radially outward of the reinforcing belts, the aramid cord reinforced overlay being wrapped in approximately 2.5 cm wide strips; ande) a pair of first runflat fillers and a pair of bead fillers, the first runfiat fillers being located between the innerliner and the first ply structure, one first runflat filler extending from each bead portion radially to beneath the reinforcing belts, one of the bead fillers being located above each bead core and adjacent the second ply structure.