Patent ID: 6179029
Filing Date: 2001-01-30
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 cordswherein,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 layers of cushion compounds composed of at least two bead fillers having unlike secant moduli of elasticity at 10% elongation, a given modulus and a lower one, said bead fillers being adjacent axially outwardly to said reinforcing cords, a zone of contact between the bead filler having a lower secant modulus of elasticity at 10% elongation and the reinforcing cords being staggered outwardly in relation to the zone of contact between the bead filler having a given secant modulus of elasticity at 10% elongation and the reinforcing cords andthe 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% lower than that of the layer of cushion compound having a given secant modulus of elasticity at 10% elongation and in that,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 at 10% elongationand 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 at 10% elongation.