Patent ID: 9102200
Filing Date: 2015-08-11
Classification: B60C

Abstract:
1. A tire with a radial carcass reinforcement comprising a crown reinforcement radially capped by a tread, the tread being connected to two beads via two sidewalls, wherein the crown reinforcement comprises: at least two working crown layers of inextensible reinforcing elements, crossed from one of said working layers to another and making angles of between 10° and 45° with a circumferential direction; at least one layer of circumferential reinforcing elements between two of said working crown layers, wherein at least one said layer of circumferential reinforcing elements is formed by the steps of individually coating a single circumferential reinforcing element by a coating rubber compound and then helically winding the individually coated single circumferential reinforcing element in substantially the circumferential direction so that the at least one said layer of circumferential reinforcing elements is a spiral and is directly coated by rubber consisting of said coating rubber compound, wherein the individually coated single circumferential reinforcing element of the at least one said layer of circumferential reinforcing elements is a metal reinforcing element with a secant modulus at 0.7% elongation comprised between 10 and 120 GPa and a maximum tangent modulus of less than 150 GPa, wherein the at least one said layer of circumferential reinforcing elements comprises at least a central part and two axially exterior parts, wherein said coating rubber compound with which said individually coated single circumferential reinforcing element of the central part is coated has an elastic modulus that is less than the elastic modulus of said coating rubber compound with which the individually coated single circumferential reinforcing element of the axially exterior parts is coated, wherein the reinforcing elements of at least one layer of circumferential reinforcing elements which are metal reinforcing elements have a curve of tensile stress as a function of relative elongation with shallow gradients for short elongations and a substantially constant and steep gradient for higher elongations, wherein the axial widths of the working crown layers radially adjacent to the at least one layer of individually coated single circumferential reinforcing element are greater than the axial width of said at least one layer of individually coated single circumferential reinforcing element, and wherein the working crown layers adjacent to the at least one layer of individually coated single circumferential reinforcing element are on each side of the equatorial plane and in the immediate axial continuation of the at least one layer of individually coated single circumferential reinforcing element coupled over an axial width in order thereafter to be decoupled by profiles of rubber compound at least over the remainder of the width common to said two working layers.