Patent ID: 8813804
Filing Date: 2014-08-26
Classification: B60C,Y10T

Abstract:
1. A tire for a heavy goods vehicle, designed to be mounted on a rim, and comprising: a crown comprising a crown reinforcement surmounted by a tread; two sidewalls extending the crown radially inwards; two beads radially inside the sidewalls and designed to engage with the rim, each bead comprising an anchoring structure, the anchoring structure comprising a circumferential reinforcement, the anchoring structure having in any radial section a radially outermost point, an axially innermost point and an axially outermost point; a radial carcass reinforcement comprising a plurality of reinforcing elements directed in a direction that makes an angle of greater than or equal to 80 degrees with the circumferential direction, the carcass reinforcement being anchored in each of the beads to the anchoring structure, the carcass reinforcement being partially wrapped around the anchoring structure, passing axially from the inside to the outside of the tire, the end point of this carcass reinforcement being located on or near the anchoring structure and axially between the axially innermost point and the axially outermost point of the anchoring structure; a coupling reinforcement formed from a plurality of reinforcing elements directed in a direction that makes an angle of greater than or equal to 70 degrees with the circumferential direction, comprising a first part in contact with the carcass reinforcement between an end point which is radially on the outside with respect to the radially outermost point of the anchoring structure and the end point of the carcass reinforcement, the coupling reinforcement being extended beyond the end point of the carcass reinforcement by a second part in contact with the anchoring structure as far as an end point radially on the outside of the anchoring structure, the end point of the coupling reinforcement being located axially between the axially innermost point and the axially outermost point of the anchoring structure; and a stiffening reinforcement surrounding the coupling reinforcement and running radially on the inside of the anchoring structure and of the coupling reinforcement so as to form an axially internal portion and an axially external portion, the axially internal portion being axially on the inside with respect to the carcass reinforcement and the axially external portion being axially on the outside of the carcass reinforcement, the axially internal portion being in contact over a length LC with the carcass reinforcement between the end point of said axially internal portion and the end point of the coupling reinforcement, the end point of said axially internal portion being located radially on the outside of the end point of the coupling reinforcement, this stiffening reinforcement being formed from a plurality of reinforcing elements directed in a mean direction that makes an angle of less than or equal to 60 degrees with the circumferential direction, wherein the axially outside end point of said stiffening reinforcement is located at a radial distance DR from the radially innermost point of the circumferential reinforcement of the anchoring structure, the radial distance DR being greater than or equal to 0.2 times the distance DC between the radially outermost point of the carcass reinforcement and the radially innermost point of the same carcass reinforcement and less than or equal to 0.6 times the distance DC between the radially outermost point of the carcass reinforcement and the radially innermost point of the same carcass reinforcement, and wherein, radially on the outside of the anchoring structure, the minimum distance DT between the axially external portion of the stiffening reinforcement and the carcass reinforcement is greater than or equal to 2 mm, wherein said stiffening reinforcement comprises a first layer of reinforcing elements and a second layer of reinforcing elements, and wherein the first layer of reinforcing elements comprises a plurality of reinforcing elements directed in a mean direction that makes an angle of greater than or equal to +40 degrees and less than or equal to +50 degrees with the circumferential direction, and wherein the second layer of reinforcing elements comprises a plurality of reinforcing elements directed in a mean direction that makes an angle of greater than or equal to −40 degrees and less than or equal to −50 degrees with the circumferential direction.