Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Aurore Lardjane

Sébastien Rigo

Anne-Lise Thuilliez

Robert Ciprian Radulescu

Christophe Le Clerc

François Barbarin

Jean-François Parmentier

Sebastien Noel

Nathalie Salgues

Jacques Besson

Sébastien Noel

Arnaud Verleene

Vincent Martin

Camille Astaix

Jacques Morel-Jean

Odile Tadjoa

François Dimier

Laurence Lapra

Claudia Navarro-Losada

Joël Barbouteau

David Fraux

Agnès Degeorges

Pascal Bertho

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.

A reinforced product () comprises: an elastomer matrix (), several reinforcing elements () embedded in the elastomer matrix (), the reinforcing elements () being arranged side by side in a main direction (X). Each reinforcing element () comprises: at least one filamentary element () comprising a single monofilament, and at least one sheath coating the filamentary elements () and comprising at least one layer of a thermoplastic polymer composition. The ratio R1=ODO/E of the mean minimum thickness ODO of elastomer present on the back of the sheath to the mean thickness E of the reinforced product () is less than or equal to 0.17, the mean minimum thickness of elastomer ODO and mean thickness E of the reinforced product () being measured in a direction (Y) substantially perpendicular to the main direction (X).

Thin reinforced product and tire comprising said product

The invention relates to a tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements the ends of which are radially uncoupled by a polymer compound. According to the invention, the reinforcing elements of at least one working crown layer are metal cords with saturated layers, at least one internal layer being sheathed with a layer consisting of a polymer composition such as a rubber composition and in each of the shoulders of the tire, at least the uncoupling polymer compound in contact with the ends of at least two working crown layers exhibits, in the sorption test, a gas content lower than 0.06 m/m.

Tire comprising a crown reinforcement

A radial tire includes a crown reinforcement or belt having a lightened belt structure. The lightened belt structure is constructed of a multilayer composite laminate that includes a first layer of rubber that radially surmounts, in a direction Z, two other layers of rubber. The first layer of rubber includes weakly heat-shrinkable textile circumferential reinforcers, for example, made of nylon or polyester. The two other layers of rubber are reinforced with monofilaments of high tensile steel. The first reinforcers have a diameter between 0.40 mm and 0.70 mm and a density between 70 and 130 threads/dm, and the second and third reinforcers have a diameter between 0.20 mm and 0.50 mm and a density between 120 and 180 threads/dm.

Tyre with lightened belt structure including steel monofilaments

A radial tire includes a crown reinforcement or belt having a lightened belt structure. The lightened belt structure is constructed of a multilayer composite laminate that includes a first layer of rubber that radially surmounts, in a direction Z, two other layers of rubber. The first layer of rubber is reinforced with first reinforcers, which are circumferential heat-shrinkable polyester textile reinforcers. The two other layers of rubber are reinforced with second and third reinforcers, which are monofilaments of high tensile steel. The first reinforcers have a diameter between 0.40 mm and 0.70 mm and a density between 70 and 130 threads/dm, and the second and third reinforcers have a diameter between 0.20 mm and 0.50 mm and a density between 120 and 180 threads/dm.

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Clermont-Ferrand, France

Aurore Lardjane