Michelin Recherche Et Technique S.a.

Societe Detechnologie Michelin

Philippe Esnault

Hubert Pacherie

Pedro Costa Pereira

Yves Herbelleau

Michael Cogne

David Jardine

Jean-Claude Aubry

Daniel Grier Osborne

Le Tu Anh Vo

Pierre Chavaroche

Karl Van Den Nieuwenhuyzen

Jean-Luc Guerbert-Jubert

Jean-Claude Goutte

Matthew Boozer

Francois Vizet

A tirecomprises a radial carcass reinforcementsurmounted radially on the outside by a crown reinforcement, the carcass reinforcementbeing formed of a plurality of metal reinforcing elements. The tire also includes two sidewalls, at least one of the sidewalls comprising an additional reinforcing reinforcementwherein the additional reinforcementcomprises, in the circumferential direction, on the tire a plurality of first partsand of second partsthat have rupture strengths, that is to say, forces that rupture per unit width of reinforcement, that are such that the rupture strength of the second partsis lower than the rupture strength of the first parts. The first partsand the second parts are arranged such that they alternate in the circumferential direction.

Additional sidewall armature for a heavy goods vehicle tire

The present invention relates to a metal cable usable for reinforcing a carcass reinforcement for a tire, such as a heavy-vehicle tire, to a composite fabric usable as a ply for such a carcass reinforcement, to a carcass reinforcement comprising this fabric and to a tire incorporating this carcass reinforcement. A metal cable according to the invention comprises a textile wrap, and is such that said wrap is formed of an aromatic thermotropic polyester or polyester amide. A composite fabric according to the invention is such that it comprises a rubber composition which is reinforced by said cables. A tire according to the invention has its carcass reinforcement comprising said composite fabric.

Metal cable usable in a tire carcass reinforcement

A tire comprising a crown extended by two respective sidewalls and two respective beads, a carcass structure anchored in each side of the tire in said beads, said crown comprising at least one reinforcing ply having parallel reinforcements oriented at an angle &#x3b1; relative to the circumferential direction ranging between 10 and 45 degrees, a first crown reinforcement having cords substantially oriented in the circumferential direction and being high elastic modulus at high stress organic fiber cords, and a second crown reinforcement having cords substantially oriented in the circumferential direction and having a ratio &#x3c4; of the tensile strength at high strain and high temperature to the tensile strength at low strain and moderate temperatures inferior to 1.5.

Pneumatic tire crown reinforcement

Hybrid cables, a process for obtaining such and a composite fabric usable in a tire incorporating the hybrid cables are disclosed. A tire and a mounted assembly which each incorporate such a composite fabric is also disclosed. The hybrid cable has a ratio of final tangent modulus:initial tangent modulus greater than 10. This hybrid cable consists of a textile core of an initial modulus of less than 900 cN/tex and a textile wrap of an initial modulus greater than 1300 cN/tex which is helically wound around the textile core.

Hybrid cables, a process for obtaining such and composite fabrics incorporating such

A tire comprising a crown, two sidewalls and two beads, a casing reinforcement anchored in each of the beads and a crown reinforcement, the crown reinforcement comprising radially, from the inside outwards, a working block and a protective block having at least one ply of circumferentially oriented parallel reinforcing threads, characterized in that the protective block ply consists of aromatic polyamide reinforcing threads with an initial modulus of less than 1000 cN/tex and a tenacity of greater than 65 cN/tex.

Tire with a protective crown ply made of very high twist aramid fiber

An as-spun monofilament of thermotropic aromatic polyester(amide), which satisfies the following conditions: D&gE;40; Te>45; &Dgr;L&gE;0, D being its diameter (in &mgr;m), Te its tenacity (in cN/tex) and &Dgr;L its variation in length (in %) after 2 minutes at 235&plusmn;5&deg; C. at an initial tension of 0.2 cN/tex. A spinning process for obtaining such a monofilament, including, upon emergence from the spinneret, of structuring the flow of the polymer by stretching in a layer of gaseous fluid for a predetermined time which is a function of the diameter D, before thermally quenching the flow of polymer thus structured in a liquid, so as to solidify it.

Thermotropic aromatic polyester(amide) monofilament

A tire whose crown has a ply of bimodulus reinforcements circumferentially oriented and spiral-wound, the ply being so arranged that, in the new tire, its reinforcements have a high-temperature contraction potential identical to that of the adhesive yarn before it is introduction in the tire. The tire has an appreciably diminished running noise.

Growing community of inventors

Greenville, SC, United States of America

Philippe Esnault