Michelin Recherche Et Technique S.a.

Compagnie Générale Des Etablissements Michelin-Michelin & Cie

Societe Detechnologie Michelin

Pierre Roux

Bernard Guerinon

Yves Herbelleau

Robert Postic

Jorge Fernando Pena

A tire comprising a crown, two sidewalls and two beads, a carcass reinforcement anchored in each of the beads and a crown reinforcement. The carcass reinforcement comprises at least two circumferential alignments of first reinforcing threads of high elasticity modulus, each circumferential alignment of the first reinforcing threads being, within each bead, bordered axially inwardly and axially outwardly by second reinforcing threads, oriented substantially circumferentially, of a modulus greater than or equal to that of the first reinforcing threads. The first reinforcing threads and second reinforcing threads are separated by a layer of mix of very high elasticity modulus. Considering &#x3a3;Ras being the total of the rigidities of extension of the second reinforcing threads arranged axially inwardly relative to the carcass reinforcement and considering &#x3a3;Ras being the total of the rigidities of extension of the second reinforcing threads arranged axially on either side of the carcass reinforcement, then:

Tire having an improved carcass reinforcement anchoring structure

A tire comprising a crown, two sidewalls and two beads, a carcass reinforcement anchored in each of the beads and a crown reinforcement. The carcass reinforcement comprises at least two circumferential alignments of first reinforcing threads of high elasticity modulus, each circumferential alignment of the first reinforcing threads being, within each bead, bordered axially by second reinforcing threads oriented substantially circumferentially. The first reinforcing threads and the second reinforcing threads are separated by a layer of mix of very high elasticity modulus. The second reinforcements are arranged in a spiral and formed of monofilaments or unit threads of steel.

A tire includes two beads and a carcass reinforcement anchored in the beads. The carcass reinforcement has at least two circumferential alignments of first reinforcing threads. Each such circumferential alignment is, within each bead, bordered axially inwardly and outwardly by second circumferential reinforcing threads having an elasticity modulus at least equal to that of the first threads. The first and second threads are separated by a rubber mix of high elasticity modulus. The outer surface of each bead includes a seat which includes an arc-shaped wall section having a geometrical center arranged axially outwardly relative to the bead. Considering an imaginary straight line passing through both the center and the bead at an angle &#x3b1;=+45&#xb1;5 degrees relative to the tire axis, all of the second threads are spaced from that axis by a radial distance no larger than the locus of the imaginary line.

An aircraft tire, the inflation pressure of which is greater than 12 bar, comprises a crown, two sidewalls and two beads, a carcass reinforcement anchored in the two beads and a crown reinforcement. The carcass reinforcement comprises at least two circumferential alignments of first reinforcing threads of high elasticity modulus. The means for anchoring the first reinforcing threads within each bead comprises second reinforcing threads oriented circumferentially and axially bordering the circumferential alignments of the first reinforcing threads, the first reinforcing threads and second reinforcing threads being separated by a layer of mix of very high elasticity modulus.

Aircraft tire having an improved bead

An airplane tire with radial carcass reinforcement (3) comprising at least one ply of turned-up textile cords (3A, 3B, 3C), wound around an axially inner bead ring (T.sub.2) extending axially from the inside to the outside in order to form an axially outer turn-up (30A, 30B, 30C), at least one ply (3D, 3E) of textile cords wound around an axially outer bead ring T.sub.1 extending from the inside to the outside to form a turn-up (30D, 30E), characterized by the fact that the turn-up (30A) of the axially innermost ply (3A) is separated, over a certain radial portion, from the carcass ply (3D) by a profiled member (4) of rubber mix in crescent shape, the maximum thickness e.sub.4 of which is at least equal to 0.5 times the total thickness t of the turn-ups (30A, 30B, 30C) of carcass plies (3A, 3B, 3C) turned-up around the axially inner bead ring T.sub.2.

Growing community of inventors

Clermont-Ferrand, France

Pierre Roux