Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Laurent Nadreau

Michael Cogne

Frédéric Massis

Bernard Jault

Niclas Seidel

Robert Veyret

A set of molding elements suitable for being inserted into a mold for molding a tire comprises a main strip () and at least one secondary strip (), the secondary strip () comprising a first secondary strip portion () and a second secondary strip portion (), the second secondary strip portion () extending the first secondary strip portion and the first () and second () secondary strip portions extending on either side of the main strip () and the set of molding elements comprising members to assemble the secondary strip () with the main strip ().

Set of molding elements for tire mold

A tire having a radial carcass reinforcement, comprised of at least one layer of metal reinforcing elements, said tire comprising a crown reinforcement, which is itself covered radially with a tread, said tread being joined to two beads via two sidewalls. The metal reinforcing elements of at least one layer of the carcass reinforcement are non-hooped cords having, in the permeability test, a flow rate of less than 20 cm/min and at least one layer of the carcass reinforcement being provided on at least one side with textile threads oriented mainly along a direction parallel to that of the metal reinforcing elements of said at least one carcass reinforcement layer, said textile threads being corrugated about this main direction.

Tire comprising carcass reinforcing cords of low permeability and textile threads associated with the carcass reinforcement

Method of manufacturing a tire comprising a carcass reinforcement extending between beads, this carcass reinforcement being anchored in each bead by being wrapped around each circumferential bead reinforcement to form a turned-back portion, this carcass reinforcement comprising at least one rubber ply which is reinforced with a plurality of metal cords of low or zero permeability, each bead comprising a plurality of rubber-based strips, at least one of these strips, known as the bead rubber strip, radially on the outside of the circumferential bead reinforcement performing a function of filling and mechanical connection between the carcass reinforcement and its turned-back portion, this bead rubber strip comprising a first surface axially towards the inside in contact with the carcass reinforcement and a second surface axially towards the outside, each bead further comprising at least one other strip, known as the filler strip which, radially on the outside of the radially outermost points of the turned-back portion of the carcass reinforcement is at least partly in contact with part of the second surface of the bead rubber strip to form a region of contact between the said two profiled elements this method comprising a step of forming a plurality of grooves on at least one of the surfaces of the strips that are in contact in the contact region, these grooves being distant from one another by at least a distance equal to 5 mm, and these first surface of the bead rubber strip being completely devoid of any groove.

Growing community of inventors

Vic le Comte, France

Laurent Nadreau