RUNFLAT TIRE WITH IMPROVED CARCASS

摘要

A runflat radial ply pneumatic tire (10) having a carcass (30) which has a pair of sidewalls (20), each sidewall being reinforced with at least two sidewall fillers or inserts (42, 46) and at least two cord reinforced plies (38, 40) and a bead core (26). The carcass has one or more reinforcing belts (36). Each sidewall has at least one ply (38 or 40) reinforced with cords, the cords have a modulus E of X, X being at least 10 GPa. At least one ply has a turnup end (32) wrapped around the bead core (26). A second ply (38 or 40) is reinforced with substantially inextensible cords having a modulus E greater than X of the cords of the other ply. The second ply (38 or 40) is spaced from the first ply (38 or 40) by the second filler or insert in the sidewall (20).