Patent ID: 6626221
Filing Date: 2003-09-30
Classification: B60C,Y10T

Abstract:
A tire comprising a tread extended by two sidewalls and two beads, each bead having an anchoring zone and a transition zone, a carcass anchored in the two beads, the said carcass being composed of reinforcing cords, wherein:in the anchoring zone of the beads, the reinforcing cords of the carcass are anchored by piles of circumferential cords with interposition, between said piles and said reinforcing cords of the carcass of a layer of cushion compound having a very high secant modulus of elasticity greater than 25 MPa at 10% elongation, in at least part of said transition zone of the beads, the reinforcing cords of the carcass arranged axially furthest outwardly in the tire are in contact, on the side of said cords toward the outside of the tire, with a layer of cushion compound having a given secant modulus of elasticity at 10% elongation, and the reinforcing cords of the carcass arranged axially furthest inwardly in the tire are in contact, on the side toward the inside of the tire, with a layer of cushion compound having a secant modulus of elasticity at 10% elongation lower than that of the said layer of cushion compound having a given modulus of elasticity, and in at least part of the said sidewalls, the reinforcing cords of the carcass arranged axially furthest outwardly in the tire are in contact, on the side of said cords toward the outside of the tire, with a layer of cushion compound having a secant modulus of elasticity at 10% elongation lower than that of the said layer of cushion compound having a given secant modulus of elasticity, and the reinforcing cords of the carcass arranged axially furthest inwardly in the tire are in contact, on the side toward the inside of the tire, with a layer of cushion compound having a secant modulus of elasticity at 10% elongation lower than that of the said layer of cushion compound having a given secant modulus of elasticity.