Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique

Compagnie G&eacute;n&eacute;rale Des Establissements Michelin - Michelin & Cie

Compagnie G{acute Over (e)}n{acute Over (e)}rale Des Etablissements Michelin - Michelin & Cie

Societe Detechnologie Michelin

Bernard Guerinon

Pedro Costa Pereira

Yves Herbelleau

Pierre Roux

Jean-Jacques Drieux

David Jardine

James Robert Anderson

Jean-Yves Denoueix

Jacques Barraud

Patrick Jon Buresh

Pascal Prost

Alain Valle

Emmanuel Igier

Eric Berger

Bertrand Boisdon

Melaine Guillou

Christine Nourry

Bernard Thevand

Tire tread having a central part (I) made from at least one first rubber compound and having at least one circumferential rib (-) formed of a plurality of blocks () separated by sipes; a first and a second lateral part (II and III) made of at least a second and third rubber compound, and having a circumferential rib () formed by a plurality of blocks (), separated by sipes, wherein the at least one second and third rubber compounds have a value of tan &#x3b4; at 23&#xb0; C.&#x2014;at a frequency of 10 Hz and an elongation of 10% &#x2014;of less than 0.25, wherein the complex modulus G*(T) of the at least one first rubber compound is greater than the complex moduli G*(T) of at least one second and third rubber compounds for all temperatures T greater than or equal to 0&#xb0; and less than or equal to 60&#xb0; C.

Tire having low rolling resistance

A tire and a method for forming a tire tread are disclosed. The tire includes a tread defining an inferior tread profile and a superior tread profile, the superior tread profile having a generally continuous curvature between an edge of contact and a top center point. The superior tread profile includes a plurality of control points and a plurality of splines. Each of the plurality of splines extends between at least two of the plurality of control points. Curvatures of adjacent splines are generally equal at each of the plurality of control points.

Tire with tread profile having continuous curvature and method for forming tire

A tire includes two beads configured to come into contact with a mounting rim and two sidewalls extending the beads radially to the outside, the two sidewalls being joined together in a crown. A crown reinforcement extends axially between two axial ends and is surmounted by a tread. The crown includes, radially on the inside of the tread and radially on the outside of a carcass reinforcement, at least one first layer of rubber mix having a modulus of elasticity which is greater than or equal to 50 MPa, this first layer extending from the median plane of the tire axially to the outside, on both sides of the median plane, only as far as an axial distance from the median plane which is less than the axial distance of the axial end of the crown reinforcement from the median plane.

Tire with crown comprising a layer of very high modulus rubber mix

A tire comprising at least one reinforcement structure of the carcass type anchored on either side of the tire in a bead, the base of which bead is intended to be mounted on a rim seat, the reinforcement structure extending circumferentially from the bead towards the sidewall, at least one arrangement of main cords along a substantially circumferential path being arranged substantially adjacent to the structure, the arrangement of the cords of the at least one arrangement being such that the number of main cords arranged on the axially inner side relative to the structure is greater than the number of main cords arranged on the axially outer side relative to the structure.

Tire with low zone comprising a concentration of cords

A motorcycle tire includes at least one carcass-type reinforcement structure formed of reinforcement elements, anchored on either side of the tire to a bead whose base is intended to be mounted on a rim seat, each bead being extended radially towards the outside by a sidewall. The sidewalls meet up radially towards the outside with a tread. Under the tread there is a crown reinforcement structure including at least one layer of reinforcement elements known as a working layer which has at least one continuous reinforcement cord forming portions in the central zone thereof. Those central cord portions display identical angles of between 10-80 degrees formed with the longitudinal direction, the angles being measured at points of intersection of the cord with a circumferential plane. Two adjacent cord portions are linked by a U-shaped loop.

Tire for two-wheeled vehicle comprising looped crown reinforcement

A tyre for a vehicle wheel comprising two sidewalls, a tread, beads, the sidewall intended to be positioned on the interior side of the vehicle being shorter than that intended to be positioned on the exterior side of the vehicle, a reinforcement structure extending between the beads and maintained in said beads by anchoring zones, each of the beads comprising a specific and distinct arrangement of the anchoring zone thereof, such that the anchoring zone of the bead intended to be positioned on the exterior side of the vehicle exhibits a greater anchoring capacity than the anchoring zone of the bead intended to be on the interior side of the vehicle. The internal and external anchoring zones are thus arranged in such a manner as to produce, in operation, a rim clamping load which is substantially identical on each side.

Extended mobility tire with asymmetrically arranged beads

Vehicle tire including two sidewalls, beads which include a seat and an external flange which are intended to come into contact with a suitable rim, and a carcass reinforcement structure. At least one bead comprises a circumferential cord structure distributed in two regions, and an anchoring region in which the reinforcement structure is anchored in the bead, that region including circumferential cords arranged as stacks distributed symmetrically on opposite sides of the reinforcement structure. The center of inertia of the bead is located in the immediate vicinity of the anchoring region.

Extended-mobility tire with bead having symmetrical load distribution

A tire for a vehicle wheel, comprising two sidewalls joined at their radially outer portions by a crown zone, beads, a reinforcement structure extending substantially radially from each of the beads, towards the crown zone, at least one of said beads comprising: a bead seat of inverted type; an anchoring zone for the reinforcement structure in said bead, comprising an arrangement of circumferential cords comprising at least two stacks distributed on either side of the reinforcement structure, said reinforcement structure being arranged so as to obtain a circumferential distribution of the cords on either side of at least one of said stacks. In this manner, a supplementary adjustment means is obtained which makes it possible to produce arrangements in which the aim is as far as possible towards equilibrium or uniformity of the stresses. Numerous benefits obtained in terms of durability and reliability.

Extended-mobility tire with decoupled anchoring zone

A tire includes a carcass-type reinforcement structure anchored on either side of the tire in a bead. Each of the beads includes an anchoring zone having a plurality of circumferential cord windings cooperating with the adjacent portion of the reinforcement structure. The cord windings are arranged to form a cord stack in which the distance between the cord of a radially innermost winding and an adjacent portion of the reinforcement structure differs from the distance between the cord of the radially outermost winding and an adjacent portion of the reinforcement structure, wherein the stack is non-parallel to the reinforcement.

Tire with non-linear anchoring of the reinforcement structure

A tire comprising two sidewalls, beads, a reinforcement structure extending radially from each of the beads towards the crown zone, at least one of said beads comprising: The anchoring rubber mix makes it possible, in spite of its rigidity which is very much less than what was advocated previously, to retain very satisfactory endurance properties.

Extended-mobility tire with anchoring zone of substantially low modulus

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.

Growing community of inventors

Clermont-Ferrand, France

Bernard Guerinon