Radial tire with crown reinforcement including radial ply

摘要

A tire with a radial carcass reinforcement of maximum axial width S₀, including a crown reinforcement formed of at least two working crown plies of inextensible reinforcement elements, crossed from one ply to the other, forming angles of between 10 and 45 with the circumferential direction, the plies having axial widths greater than the width of an additional ply of inextensible, substantially radial, metallic reinforcement elements. The additional ply is arranged radially between the working plies, the working plies being, on either side of the equatorial plane and in the immediate axial extension of the additional ply, coupled over an axial distance at least equal to 3.5% of the width S₀, then being decoupled by profiled members of rubber mix at least over the remainder of the width common to the two working plies.