Patent ID: 8069891
Filing Date: 2011-12-06
Classification: B60C,Y10T

Abstract:
1. A tire having a radial carcass reinforcement comprising: a crown reinforcement formed of at least two working crown layers of inextensible reinforcement elements, which are crossed from one ply to the other, forming angles of between 10° and 45° with a circumferential direction of the tire, and topped radially by a tread, said tread being joined to two beads by means of two sidewalls, said at least two working crown layers having different axial widths, at least one first profiled element P of rubber mix separating one of said at least two working crown layers from at least one end of a second, axially narrower, of said at least two working crown layers, wherein said profiled element P is radially separated at least in part from a liner C of said axially narrower working crown layer by a second profiled element of a rubber mix G, and wherein said first and second profiled elements of rubber mix P and G and said liner C have secant moduli of elasticity under tension at 10% elongation MP, MG, MC respectively such that MC≧MG>MP; and in each shoulder, at least one additional layer of reinforcement elements, which are parallel to each other in the additional layer and are oriented substantially perpendicular relative to the reinforcement elements of a working crown layer radially adjacent to said additional layer, wherein an axially inner end of said additional layer is radially adjacent to an edge of at least one of said at least two working crown layers; wherein an axially outer end of said additional layer is located at a distance from an equatorial plane of the tire, said distance being less than or equal to a distance between said equatorial plane and an end of one of said at least two working crown layers to which said additional layer is adjacent, and wherein the axially inner end of said additional layer is radially adjacent and external to the edge of the axially least wide working crown layer.