Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Yves Potin

Arnaud Frappart

Bozena Voge

Florian Vilcot

Guillaume Pibre

Daniel Beaulaton

Marc Francia

Matthieu Pelisse

Eric Durand

Tire

The tire has a load index that is at least 118 and two layers of reinforcing elements. Each of the layers has a breaking force per unit width that is higher than 2900 daN/dm. A minimum strength per unit width, measured for an elongation of less than 10%, of the second layer is greater than 20% of the minimum strength per unit width, measured for an elongation of less than 10%, of the first layer. The reinforcing elements of the first layer have a thread count that is higher than 300 tex. The reinforcing elements of the two layers have a thread count of less than 750 tex. The elongation of the reinforcing elements of the second layer are greater than 8% under a force of 20 daN and the secant elastic modulus values under tension at 10% elongation, Mt, Mj, satisfy the relationship Mt/Mj&#x2265;1.

Tire comprising a carcass reinforcement made up of two layers

Each of at least two layers of a carcass reinforcement has a breaking force per unit width higher than 2250 daN/dm. The minimum strength per unit width, measured for an elongation of less than 10%, of a second layer of carcass reinforcement is strictly greater than a value equal to 20% of the minimum strength per unit width, measured for an elongation of less than 10%, of a first layer of carcass reinforcement. The reinforcing elements of the two layers of carcass reinforcement have a thread count of less than 750 tex. The elongation of the reinforcing elements of the second layer of carcass reinforcement is greater than 4% under a force of 20 daN, and the secant elastic modulus values under tension at 10% elongation, Mt, Mj, satisfy the relationship Mt/Mj&#x2265;1.

A tire including two beads which are intended to be in contact with seats of a mounting rim and two sidewalls, this tire including first reinforcing threads forming a carcass reinforcement, each bead including an anchoring structure for the carcass reinforcement formed of at least one circumferentially oriented second reinforcing thread cooperating with an adjacent portion of the carcass reinforcement by means of an anchoring rubber material having an elasticity modulus at 10% deformation at least equal to 30 MPa, wherein this tire includes, at least axially on one side of the anchoring structure of the carcass reinforcement, a rubber mix referred to as a 'decoupling mix', this decoupling mix having an elasticity modulus, at 10% deformation, less than half of the elasticity modulus of the anchoring mix.

Tire bead facilitating mounting

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Clermont-Ferrand, France

Yves Potin