Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements Michelin

Jean-Claude Faure

Emmanuel Igier

Jean-Luc Bouvier

Olivier Muhlhoff

Jean-Jacques Drieux

James Milo Endicott

Claude Eynard

Jean-Luc Mangeret

Pascal Pirotte

Patrick Bervas

Jean-Pierre Cowart Pompier

Robert Vanstory Teeple

Pierre Fraisse

Tire having a load index LI, as defined in the ETRTO Standards Manual 2010, lying in the range between 65 and 105. The tire comprises a tread and an under layer () extending over the whole width of the tread and having an average radial height greater than 20% of the average radial height of the tread and a maximum value of tan &#x3b4; at 23&#xb0; C. and 10 Hz less than the corresponding value of the tread. Radial carcass reinforcement () extends from the beads across the sidewalls as far as the crown. The tire has an outside diameter OD and a nominal section width SW, as defined in the ETRTO Standards Manual 2010, that satisfy the following inequality: OD/SW&#x3e;&#x2212;0.00082641 LI+0.11266 LI&#x2212;0.185.

Optimised tire

A tire comprising a tread portion designed to be worn off during the life of the tire having a radial thickness T, an outer edge and an inner edge, the axial distance between the outer edge and the inner edge defining the axial width L of the tread, the tread comprising four adjacent portions made of a four rubber compounds, wherein the rubber compounds making up the first and third portions are predominantly filled with carbon black filler, wherein the rubber compounds making up the second and fourth portion are predominantly filled with non carbon black filler, wherein the rubber compounds making up the first and third portions have a value for tan &#x3b4; at 0&#xb0; C., at a stress of 0.7 MPa, that is lower than that of the rubber compounds making up the second and fourth portion, and wherein the axial width of the first portion decreases and the axial width of the second portion increases as a function of the distance from the rolling surface of the tread when unworn.

Tire with improved tread

Tire () comprising a tread () having a mean radial height HB, an outer edge () and an inner edge (), the axial distance between the outer edge () and the inner edge () defining the axial width L of the tread, the tread comprising a first portion () made of a first rubber compound, extending from the outer edge () to a first axial position at an axial distance from the outer edge of between 20% and 40% of the axial width; a second portion () made of a second rubber compound, extending from said first axial position to a second axial position at an axial distance from the outer edge of between 50% and 60% of the axial width L; a third portion () made of a third rubber compound extending from said second axial position to a third axial position at an axial distance from the outer edge of between 80% and 90% of the axial width L; and a fourth portion () made of a fourth rubber compound, extending from said third axial position to the inner edge () of the tread, wherein said first and third rubber compounds are predominantly filled with carbon black filler, wherein said second and fourth rubber compounds are predominantly filled with non carbon black filler, and wherein said first rubber compound and said third rubber compound have a value for tan &#x3b4; at 0&#xb0; C., at a stress of 0.7 MPa, that is lower than that of said second rubber compound and said fourth rubber compound.

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 tire with radial carcass reinforcement having beads with a heel portion on an axially inner side and a toe portion on an axially outer side includes two carcass reinforcement plies for tension in higher sidewall tires. The bead includes at least one bead wire coated with a rubber mix, a wedge formed of a rubber mix disposed axially outward of the at least one bead wire, and at least one rubber filler located axially and radially outward of the bead wire and wedge. The wedge is defined by two sides extending at an acute angle axially from an apex A located beneath the section of the at least one bead wire, the rubber mix forming the wedge having a Shore A hardness of at least 65 and greater than the Shore A hardness of the at least one rubber filler. According to one embodiment, a carcass reinforcement includes two plies, a first radial reinforcement ply wound on the at least one bead wire to form a first upturn, as viewed in meridian section, the reinforcement ply is wound about said bead wire passing from the heel to the toe of said at least one bead, the first upturn engaging the radially outer side the wedge and, a second radial reinforcement ply wound on said at least one bead wire, wherein, when viewed in meridian section, the second reinforcement ply is disposed in parallel to the first radial reinforcement ply in a sidewall area of the tire and is wound about said bead wire passing from the heel to the toe of said at least one bead with a second upturn extending into engagement with the radial inner side of the wedge.

Tire with multiple carcass reinforcement plies having beads of specified structure

A tire having a radial carcass reinforcement winding within each bead around at least one heel reinforcement element and whose meridian profile, when the tire is mounted and inflated, has a constant direction of curvature in a first bead and a sidewall extending it radially, and has a tangent TT&prime; to the point of tangency T of the carcass reinforcement profile with the annular element of the first bead which forms with the axis of rotation an angle &phgr; which is open towards the outside and is greater than 45&deg;, wherein, viewed in meridian section, at least the aforesaid sidewall comprises a reinforcing profiled element having, viewed in section, substantially the form of a crescent, one of the axially inner or outer faces of the crescent-shaped profiled element follows the profile of the carcass reinforcement, and the trace of the face of the crescent-shaped profiled element opposite the face of such profiled element closest to the carcass reinforcement has a single direction of curvature.

Growing community of inventors

Mozac, France

Jean-Claude Faure