Compagnie Generale Des Etablissements Michelin

Camille Astaix

Aurore Lardjane

Odile Tadjoa

A radial tire, notably for a passenger vehicle or van, has a very thin belt structure comprising a multilayer composite laminate of specific construction, with a first layer of rubber reinforced by circumferential textile reinforcers in the form of monofilaments or assemblies of monofilaments, preferably slightly heat-shrinkable, for example made of nylon or of polyester, this first layer radially (in the direction Z) surmounting two other layers of rubber, reinforced by high-strength steel monofilaments. The mean thickness of rubber, measured in the radial direction (Z), separating a first reinforcer from the second reinforcer which is closest to it, and that separating a second reinforcer from the third reinforcer which is closest to it, are both less than or at most equal to 0.35 mm.

Radial tire having a very thin belt structure

A radial tire comprises a multilayer composite laminate () comprising at least three superposed layers of reinforcers (), the reinforcers being unidirectional within each layer and embedded in a thickness of rubber (C, C, C, respectively), with a first layer of rubber (C) comprising at least one row of heat-shrinkable circumferential textile reinforcers (), for example made of nylon or polyester. The first layer radially (in the direction Z) surmounts two other layers (C, C) comprising metal reinforcers () which are crossed from one layer to the next, in the form of steel monofilaments of a diameter between 0.20 mm and 0.50 mm. The reinforcers () made of heat-shrinkable textile material are tapes of thickness denoted 'T' between 0.1 mm and 1 mm, and of thickness denoted 'W' between 2 and 50 mm.

Radial tire having an improved belt structure

A radial tire with a lightened belt structure () comprises a multilayer composite laminate () of specific construction, with a first layer () of rubber (C) reinforced with preferably weakly heat-shrinkable circumferential textile multifilament fibres () twisted individually on themselves with a torsion T greater than 100 turns per meter, for example, made of nylon or of polyester, this first layer radially (in the direction Z) surmounting two other layers () of rubber (C, C, respectively) reinforced with monofilaments () of high tensile steel. The first reinforcers have an envelope diameter between 0.30 mm and 0.60 mm and a density, measured in the axial direction Y, between 90 and 150 threads/dm, and the second and third reinforcers each have a diameter between 0.20 mm and 0.50 mm and a density, measured in the axial direction Y, between 100 and 180 threads/dm.

Radial tire having a lightweight belt structure

A radial tire with a lightened belt structure () comprises a multilayer composite laminate () of specific construction, with a first layer () of rubber (C) reinforced with preferably weakly heat-shrinkable circumferential textile monofilaments () with a diameter greater than 0.10 mm or assemblies of such monofilaments, for example, made of nylon or of polyester, this first layer radially (in the direction Z) surmounting two other layers () of rubber (C, C, respectively) reinforced with monofilaments () of high tensile steel. The first reinforcers have an envelope diameter between 0.20 mm and 1.20 mm and a density, measured in the axial direction Y, between 70 and 130 threads/dm, and the second and third reinforcers each have a diameter between 0.20 mm and 0.50 mm and a density, measured in the axial direction Y, between 100 and 180 threads/dm.

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Clermont-Ferrand, France

Camille Astaix