Michelin Recherche Et Technique S.a.

Michelin Recherche & Technique S.a.

Claude Eynard

Jean-Luc Bouvier

André Peyrot

Olivier Muhlhoff

Jean-Jacques Drieux

Adam Jara

Jean-Claude Faure

Pierre Chandezon

Jean-Claude-John Faure

Bertrand Imbert

Tire bead protection

A tire P with a radial carcass reinforcement (), intended for mounting on a rim J at least one of whose seats () is inclined outwards and is extended axially on the outside by a hump () of small height, said hump comprising an axially outer wall (), and comprising two sidewalls () and at least one bead () with a heel axially on the inside and a bead toe axially on the outside, said bead () being provided with a protective rib T extending in the circumferential direction and axially further away from the equatorial plane than the axially outer wall () of the hump () of the rim in order to protect said rim J, the profile of the lower face BC connecting the axially outer face AB of the protective rib T and the profile of the bead () being totally located radially outside a virtual segment whose ends are on the one hand the radially innermost point B of the axially outer face AB of the rib T, and on the other hand the last point C' of the tire bead which is in contact with the hump of the rim.

Tire bead with protective rib

A tire apparatus for driving a vehicle allows the vehicle to be driven during periods of both low tire pressure and normal tire pressure. The tire apparatus has a tire that has a tread section. The tire has a pair of side walls that are located adjacent to the tread section. A first bead is located at an end of one of the side walls, and a second bead is located at an end of the other side wall. A wheel is also present that has a rim with a first bead seat and a second bead seat. The wheel is configured for attachment to the vehicle. The wheel has a support member for engaging the tire during periods of low tire pressure. At least one of the first and second bead seats has a plurality of friction members to prevent relative rotational movement between the tire and the rim.

Tire to rim rotation limiter for a run-flat assembly

A process for demounting a tire P, and a tread-bearing support S internal thereto, from an integral mounting rim J, which comprises first and second rim seats, the two rim seats being inclined towards the outside and extended axially to the outside by projections of low height. The process includes the steps of inserting, into a lubricated gap between the toe of the first bead B and the corresponding rim seat, a demounting insert I in the form of a portion of a circular ring of triangular meridian section of small dimensions, and then ejecting the first bead B from the rim J before or simultaneously with the ejection of the tire/support assembly.

Process for demounting a tire on a rim having seats inclined towards the outside

A tire having at least one bead seat inclined towards the outside and a radial carcass reinforcement ( ) wound within said bead around a bead wire ( ) from the heel to the toe of the bead B to form an upturn ( ), the edge of which, viewed in meridian section, is located on the radially outer face ( ) of a profiled element ( ) of rubber mix. The profiled element is located axially and externally adjacent to the bead wire ( ), and has, viewed in meridian section, the shape of a drop of water with an apex A located beneath the section of the bead wire ( ), and a Shore A hardness greater than the Shore A hardness(es) of the rubber mixes ( ) located axially and radially above the bead wire/profiled element assembly. The carcass reinforcement upturn ( ) is extended by a reinforcement armature ( ) which surrounds the profiled element ( ).

Tire bead

A tire has a radial carcass reinforcement having a bead, the seat of which is inclined towards the outside, the bead heel axially to the inside and reinforced by at least one reinforcement element, the bead toe axially to the outside and having a profiled element of rubber mix in the form of a wedge defined by two sides, the mix having a Shore A hardness greater than the Shore A hardness of the rubber mixes radially above, wherein the reinforcement winds around the annular element to form an upturn, the end of which is located axially to the outside of a straight line P perpendicular to the axis of rotation and passing through the center of gravity of the meridian section of the element, and axially to the inside and radially to the outside of the straight line P supporting the radially outer side of the profiled element.

Growing community of inventors

Peyriac-de-Mer, France

Claude Eynard