Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Establissements Michelin

Sébastien Noel

Luc Bestgen

Sébastien Rigo

Maxime Rolland

Nathalie Salgues

Alain Domingo

Hichem Rehab

Gilles Godeau

Michael Cogne

Philippe Johnson

Aurore Lardjane

Jacques Besson

Julien Metzger

Lionel Belin

Arnaud Verleene

Patrick Dayet

Charlotte Caffeau

Patricia Lagarde

Bernard Jault

Christelle Chaulet

Isabelle Riou

Orel Fournier

Jean-Luc Guerbert-Jubert

Agnès Degeorges

Isabelle Demay

Jérémy Guillaumain

Benoît Buffetaud

A tire having a radial carcass reinforcement, made up of a single layer of reinforcing elements anchored in each of the beads by being turned up around a bead wire, reinforced by a stiffener. The two working crown layers are the only ones present to form the crown reinforcement over at least 75% of the width of the tread, the absolute value of the difference between the absolute values of the angles α2 and α1 being greater than 8°, α2 being greater than α1 in terms of absolute value, the mean angle α satisfying the relationship 13+131*exp(−L/100)<α<20+164*exp(−L/100), the reinforcing elements of the carcass reinforcement being cords which, in the test referred to as the permeability test, yield a flow rate of less than 20 cm/min, a rubber compound being present within the cords, and, in the sidewall of the tire, the profile of the outer surface of the tire is at a constant distance from the carcass reinforcement layer between the points F and A, and meets the outer surface of the bead at the point C, forming two successive circular arcs.

Tire having a crown reinforcement made up of two working crown layers and optimized sidewalls

A tire having a radial carcass reinforcement, made up of a single layer of reinforcing elements anchored in each of the beads by being turned up around a bead wire, reinforced by a stiffener. The two working crown layers are the only ones present to form the crown reinforcement over at least 75% of the width of the tread, the absolute value of the difference between the absolute values of the angles α2 and α1 being greater than 7°, α2 being greater than α1 in terms of absolute value, the mean angle α satisfying the relationship 13+131*exp(−L/)<α<28+110*exp(−L/), the reinforcing elements of the carcass reinforcement being cords which, in the test referred to as the permeability test, yield a flow rate of less than 20 cm/min, a rubber compound being present within the cords, and, in the sidewall of the tire, the profile of the outer surface of the tire is at a constant distance from the carcass reinforcement layer between the points F and A, and meets the outer surface of the bead at the point C, forming two successive circular arcs.

Tire having optimized sidewalls and crown reinforcement made up of two working crown layers and a layer of circumferential reinforcing elements

A cord rubberized in situ (C) comprising: an internal layer of the cord (CT), an external layer of the cord (CT), a rubber composition () positioned between the internal layer of the cord and the external layer of the cord. The rubber composition () comprises a compound of formula (I): in which X and Y represent, independently of each other, an alkali metal or alkaline earth metal cation.

Cable rubberized in situ comprising a rubberizing composition comprising a corrosion inhibitor

A cord rubberized in situ (C). Internal layer of the cord (CT1) comprises N1 internal thread(s). External layer of the cord (CT3) comprises N3 external threads wound helically around the internal layer of the cord. Rubber composition (20) is positioned between the internal layer of the cord and the external layer of the cord, and comprises a compound of formula (I) or a salt of this compound: in which: each R1, R2 and R3 group represents, independently of one another, an alkylene, arylene, arylalkylene, alkylarylene or cycloalkylene group, each Xand Xgroup represents, independently of each other, &#x2014;COOH, &#x2014;CO&#x2014;NH&#x2014;OH, &#x2014;SOOH, &#x2014;PO(OR)(R') or &#x2014;PO(OR)(OR&#x2032;) with R and R&#x2032; representing, independently of each other, hydrogen or an alkyl group, and Xcomprises at least one &#x2014;COOH, &#x2014;CO&#x2014;NH&#x2014;OH, &#x2014;SOOH, &#x2014;PO(OR)(R&#x2032;) or &#x2014;PO(OR)(OR&#x2032;) group with R and R&#x2032; representing, independently of each other, hydrogen or an alkyl group.

Cable gummed in situ and containing a gumming composition that contains a corrosion inhibitor

A process for drawing a steel wire, in which the wire has a carbon content by weight C of 0.4%&#x2266;C&#x2266;0.74%, includes an uninterrupted series of drawing steps. The drawing steps draw the wire from a diameter d' to a diameter d, with d&#x2032; and d being expressed in mm, and with a true strain &#x3b5;&#x2032; of the steel wire being given by &#x3b5;&#x2032;=2&#xd7;ln(d&#x2032;/d), with &#x3b5;&#x2032;&#x3e;4.

Wire drawing method

A tire with a radial carcass reinforcement made up of at least one layer of metal reinforcing elements, the tire comprising a crown reinforcement itself capped radially with a tread, the tread being connected to two beads via two sidewalls. At least 70% of the metal reinforcing elements of at least one layer of the carcass reinforcement are non wrapped cables which, in what is known as the air-wicking test, display a flow rate of less than 2 cm3/min, and at least 10% of the metal reinforcing elements of the at least one layer of the carcass reinforcement are cables which, in what is known as the air-wicking test, display a flow rate of greater than 4 cm3/min.

Tire comprising carcass reinforcement wires having different perviousnesses

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Clermont-Ferrand, France

Sébastien Noel