Compagnie Générale Des Etablissements Michelin-Michelin & Cie

Michelin Recherche Et Technique S.a.

Jean Billieres

Pierre Durif

Pierre Chandezon

Abelardo Cabestrero

A tire having at least one reinforcement ply formed of reinforcement elements embedded in vulcanized rubber, characterized in that the reinforcement elements for said ply are individually coated in a rubber mix (B, B), referred to as 'coating mix', having a given composition and physical properties, the reinforcement elements arranged parallel to each other being covered on one face by a first rubber layer (A, A), referred to as 'first calendering layer', of constant composition and properties, whereas the elements are covered on the opposite face by a second rubber calendering layer (C, D), of composition and properties which are variable according to the meridian position on the ply within the tire.

Tire with specified reinforcing ply

A tire to be mounted on a rim of axial width L, with flanges with rounded rim hooks, having a tread joined to two beads ( ) by two sidewalls ( ) and at least one carcass reinforcement ( ) formed of at least one ply of reinforcement elements, characterized in that each bead ( ) is without a bead wire, the carcass reinforcement ( ) having in each bead ( ) a meridian profile which is curved axially and radially from the outside to the inside to form an axially inner edge located in an angle a open axially and radially towards the inside, one of the edges of which is parallel to the axis of rotation, the carcass reinforcement ( ) being reinforced in each bead ( ) at least radially to the outside and axially to the inside by at least one first continuous additional layer ( ), of meridian profile substantially parallel to the meridian profile of the carcass reinforcement ( ) in the bead ( ) and including at least one first section composed of at least one ply (6 , 6 , 6 ) of inextensible reinforcement elements forming an angle of between &minus;2.5&deg; and &plus;2.5&deg; with the circumferential direction.

Tire bead without bead cord

Radial tire comprising a carcass ply with a notched lap weld

A tire which, during use is subjected to one or more severe stresses lead to an appreciable reduction of its potential lifetime of use under nominal conditions. In order to be able to determine whether a tire has undergone such severe conditions, the tire is provided with a monitoring device, containing at least one means sensitive to a given stress and capable of memorizing a piece of information, according to the stress to which the component has been subjected for at least a given time or a given number of cycles.

Device for monitoring stresses undergone by a tire

Tire having reinforcement ply with discontinuous substantially

Tire with radial carcass reinforcement having specified turn-up

Process for the manufacture of a tire having a carcass reinforcement

Tire with radial carcass with outside to inside turn-ups

Tubeless tire with bead protectors having air-impermeable layer and

In order to grind a tire 2 mounted on a vehicle, an abrasive belt 5 is us which is stretched over rollers 51, 52, 53, 54 and 46 which are mounted on a frame 4. By the action of a jack 7, the tire 2 is released of all load. A counterweight 45 urges the frame 4 towards the tire 2. The force with which the abrasive belt 5 rests on the tire 2 can be adjusted to a very low value.

Method and apparatus for grinding tires

Rim with inclined seats and assembly of such a rim with a tire

Growing community of inventors

Clermont-Ferrand, France

Jean Billieres