Patent ID: 6799618
Filing Date: 2004-10-05
Classification: B60C,D02G,Y10S,Y10T

Abstract:
A pneumatic tire comprising a radial ply carcass, a tread disposed radially outwardly of the crown region of the carcass and a crown reinforcing structure interposed between the tread portion and the crown region of the carcass in circumferential surrounding relation to the carcass, whereby the crown reinforcing structure includes a belt assembly having at least a first, radially innermost and a second, radially outermost belt ply, each of the belt plies comprising reinforcement cords extending parallel to one another in each belt ply, and the cords in the first belt ply making with the cords in the second belt ply opposed angles with respect to the equatorial plane of the tire, as well as a textile overlay structure consisting of a cord reinforced helically wound elastomeric strip extending transversely over the belt assembly, the elastomeric strip and each overlay cord therein making an angle of between 0 degrees and 5 degrees with the equatorial plane of the tire, the tire characterized in that:the elastomeric strip includes at least one hybrid cord of yarns of aramid and nylon twisted together; and each twisted cord has, on the graph representing its elongation versus the load applied, a tangent of at most 5 cN/tex % at elongations up to 4% and an inclination above 10 cN/tex % at elongations above 6% after shaping and curing of the tire.