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AssigneesMichelin Recherche et Technique S.A., Compagnie Generale Des Establissements Michelin
InventorsGilles Sallaz, Agnés Degeorges, Alain Domingo, Sébastien Noel
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The invention relates to a tire having a radial carcass reinforcement, consisting of at least one layer of reinforcing elements anchored in each of the beads by an upturn around a bead wire, said carcass reinforcement upturn being reinforced by at least one layer of reinforcing elements or stiffener, the radially outer end of which is radially on the outside of the end of the upturn. According to the invention, the reinforcing elements of at least one stiffener are non-wrapped metal cords with saturated layers, having, in what is called the permeability test, a flow rate of less than 5 cm3/min and the modulus of elasticity of the layer of polymer blend in contact with the carcass reinforcement upturn and separating the stiffener from the end of the carcass reinforcement upturn is greater than 4 MPa.
A tire having a radial carcass reinforcement, having at least one layer of reinforcing elements, said tire comprising a crown reinforcement, which is itself covered radially with a tread, said tread being joined to two beads via two sidewalls, at least one layer of reinforcing elements of the radial carcass reinforcement being anchored in each of the beads by an upturn around a bead wire, said radial carcass reinforcement upturn being reinforced by at least one stiffener comprising a layer of reinforcing elements, at least the end of the radial carcass reinforcement upturn being separated from the stiffener by at least one layer of polymer blend, wherein the reinforcing elements of at least one stiffener are non-wrapped metal cords with saturated layers, having, in what is called the permeability test, a flow rate of less than 5 cm3/min and wherein the modulus of elasticity of the at least one layer of polymer blend in contact with the carcass reinforcement upturn and separating the stiffener from the end of the carcass reinforcement upturn is greater than 4 MPa.
The tire according to claim 17, wherein said at least one diene elastomer is selected from the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers and blends of these elastomers.
The tire according to claim 17, wherein the crosslinkable or crosslinked rubber composition based on at least one diene elastomer has, in the crosslinked state, a secant modulus in extension less than 20 MPa.
Dependencies are inferred from the claim text.