US Patent 7500501 Crown reinforcement for a radial tire

A tire includes comprising a radial carcass reinforcement surmounted radially by a crown reinforcement including a working reinforcement. The working reinforcement includes two working crown plies of calendered inextensible metalic reinforcement elements and rubber mix, and a protective ply of metalllic reinforcements. The metallic reinforcement elements of the working crown plies are parallel to each other within each working crown ply and are crossed from one working crown ply to the next, forming with the circumferential direction angles α1 and α2 of between 10° and 45°. The working crown plies include a radially inner working crown ply having an axial with L3 which is greater than L2. A layer P of cohesive rubber mixes is arranged between at least the ends of the working crown plies.