Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Florian Vilcot

Sébastien Rigo

Bastien Limozin

Richard Cornille

Yves Potin

Magaly Brousseau

Daniel Beaulaton

Gregor Hug

Olivier Muhlhoff

Luc Bestgen

Matthieu Bonnamour

Damien Fombelle

Jean-Michel Huyghe, Jr

Marc Francia

Vincent-Jacques Chaput

Jean-Michel Huygue

Pierre Laurent

Aneta Babacz

Claire Pucci

A tire () having at least one sidewall (), intended to interact with a sidewall insert () by way of an anchor (), and aims to personalize the design of the sidewall. The anchor (), has a recess () formed in an axially outer sidewall layer (), with a protuberance (), which is raised in relation to the recess bottom () and extends from the recess bottom () to the vicinity of the axially outer sidewall face (), and the protuberance () is constituted by a stepped arrangement of a first narrow portion () having a minimum width Lpmin and a second wide portion () having a maximum width Lpmax, such that the difference Lpmax−Lpmin is at least equal to 1 mm and at most equal to 4 mm.

Tire comprising a sidewall insert

A tire () for two-wheeled vehicles comprises a crown () comprising: a tread (), and a hoop reinforcement () comprising at least one hooping ply () comprising one or more hoop reinforcing elements () comprising an assembly made up of a multifilament strand of aromatic polyamide or aromatic copolyamide () and of a multifilament strand of aliphatic polyamide (). The twist factor K of the hoop reinforcing element () ranges from 5.5 to 6.5. The tire () is obtained by a method comprising a step of manufacturing the hooping ply (), in which the bonded reinforcing elements () are embedded in a polymer composition in order to form the uncured hooping ply, the equivalent initial tensile modulus of the uncured hooping ply ranging from 330 to 620 cN/tex/dm.

Tire for two-wheeled vehicle comprising a hybrid hooping reinforcement

The assembly () comprises: a woven first fabric () comprising filamentary warp elements () comprising first and second filamentary members, a woven second fabric (), a bearing structure () comprising filamentary bearing elements () connecting the woven first and second fabrics together. For a length at rest L of the woven first fabric (): for any elongation of the woven first fabric () less than or equal to (2&#x3c0;&#xd7;H)/L, the first filamentary member has a non-zero elongation and is not broken; there is an elongation of the woven first fabric (), less than or equal to (2&#x3c0;&#xd7;H)/L, and beyond which the second filamentary member is broken, in which H0&#xd7;K&#x2264;H where H0 is the distance between the woven first and second fabrics () when each filamentary bearing portion () is at rest, and K=

Assembly comprising a partially breakable fabric and a supporting structure

The assembly () comprises: a first structure () extending in a first overall direction (G), a second structure (), and a bearing structure () comprising filamentary bearing elements () comprising at least one filamentary bearing portion () extending between the first structure () and the second structure (), the first structure () being arranged such that, for a length at rest L of the first structure () in the first overall direction (G), the elongation at maximum force Art of the first structure in the first overall direction (G) satisfies: Art&#x2264;(2&#x3c0;&#xd7;H)/L, in which H&#xd7;K&#x2264;H where His the mean straight-line distance between an internal face () of the first structure () and an internal face () of the second structure () when each filamentary bearing portion () is at rest, and K=0.50.

Tire assembly comprising a breakable structure and a supporting structure

A process is provided for manufacturing a tire assemblage that includes a first woven or knitted fabric including first threadlike elements, a second woven or knitted fabric including second threadlike elements, and a bearing structure including bearing elements connecting the first and second woven or knitted fabric together. The process includes coating each first threadlike element with a layer of a first adhesive composition and coating each second threadlike element with a layer of a second adhesive composition, heat treating each coated first threadlike element and each coated second threadlike element to crosslink the first adhesive composition and the second adhesive composition, and assembling the bearing elements with each heat-treated and coated first and second threadlike element to form part or all of the tire assemblage.

Assembly intended for a tire and including woven or knitted fabric(s) including pre-adhered wire elements

A tire assembly includes an assemblage formed of first and second impregnated woven or knitted structures, a bearing structure, and at least one sacrificial holder. The first impregnated woven or knitted structure includes a first woven or knitted fabric and a first layer of a first polymeric composition. The second impregnated woven or knitted structure includes a second woven or knitted fabric and a second layer of a second polymeric composition. The bearing structure includes bearing elements connecting the first and second woven or knitted fabrics together. Each sacrificial holder is structured to hold temporarily the first and second impregnated structures in contact with each other, connecting the first and second woven or knitted fabrics together. When the first and second impregnated woven or knitted structures are separated from each other, each sacrificial holder breaks before any breakage of the bearing elements.

Assembly for tire including impregnated woven or knitted fabric(s) and a sacrificial holder

A tire carcass () comprises two sidewalls () and a crown () suitable for receiving, radially externally, a tread (), the internal surface of the sidewalls and of the crown forming an internal wall (), also comprising a circumferential tread support surface () provided with a layer of thermoplastic elastomer (TPE), the support surface () extending from one bead () to the other while passing through the sidewalls () and the crown ().

Tire in two parts suited to retreading

Bearing structure () has identical bearing elements () in tension outside contact patch (A) with the ground and in compression in the contact patch (A). Bearing elements () are filamentary and are connected to radially inner face () of radially outer structure of revolution () by radially outer fabric () and to radially outer face () of radially inner structure of revolution () by radially inner fabric (), respectively. Furthermore, mean surface density D of bearing elements () per unit area of radially outer structure of revolution (), expressed in 1/m, is at least equal to (S/S)*Z/(A*F), where S is area, in m, of radially inner face () of radially outer structure of revolution (), Sis connecting area, in m, of radially outer fabric () with radially inner face () of radially outer structure of revolution (), Z is nominal radial load, in N, A is area of contact with the ground, in m, and Fis the force at break, in N, of bearing element ().

Tire-type device for a vehicle

The tire has a load index that is at least 118 and two layers of reinforcing elements. Each of the layers has a breaking force per unit width that is higher than 2900 daN/dm. A minimum strength per unit width, measured for an elongation of less than 10%, of the second layer is greater than 20% of the minimum strength per unit width, measured for an elongation of less than 10%, of the first layer. The reinforcing elements of the first layer have a thread count that is higher than 300 tex. The reinforcing elements of the two layers have a thread count of less than 750 tex. The elongation of the reinforcing elements of the second layer are greater than 8% under a force of 20 daN and the secant elastic modulus values under tension at 10% elongation, Mt, Mj, satisfy the relationship Mt/Mj&#x2265;1.

Tire comprising a carcass reinforcement made up of two layers

Each of at least two layers of a carcass reinforcement has a breaking force per unit width higher than 2250 daN/dm. The minimum strength per unit width, measured for an elongation of less than 10%, of a second layer of carcass reinforcement is strictly greater than a value equal to 20% of the minimum strength per unit width, measured for an elongation of less than 10%, of a first layer of carcass reinforcement. The reinforcing elements of the two layers of carcass reinforcement have a thread count of less than 750 tex. The elongation of the reinforcing elements of the second layer of carcass reinforcement is greater than 4% under a force of 20 daN, and the secant elastic modulus values under tension at 10% elongation, Mt, Mj, satisfy the relationship Mt/Mj&#x2265;1.

Tire-type device having bearing elements () within annular space () between inner and outer coaxial structures of revolution, the latter contacting the ground in contact patch (A). The bearing elements are independent in pairs and buckle under compression in contact patch (A). The smallest characteristic dimension E of the section S of any bearing element () is at most equal to 0.02 times the mean radial height H of the inner annular space (), the surface density D of the bearing elements () per unit area of the radially outer structure of revolution, expressed in 1/m, is at least equal to Z/(A*&#x3a3;Fr/n), where Z is the nominal radial load, expressed in N, A is the area of contact with the ground, expressed in m, and &#x3a3;Fr/n is the mean force at break under tension of the n bearing elements made to buckle under compression, expressed in N.

Tire-type device having bearing elements () within annular space () between inner and outer coaxial structures of revolution, the latter contacting the ground in contact patch (A). The bearing elements are independent in pairs and buckle under compression in contact patch (A). The smallest characteristic dimension E of section S of bearing element () is at most equal to 0.02 times the mean radial height H of the inner annular space (), the surface density D of the bearing elements () per unit area of the radially outer structure of revolution, expressed in 1/m, is at least equal to Z/(A*&#x3a3;Fr/n), where Z is the nominal radial load, A is the area of contact with the ground, and &#x3a3;Fr/n is the mean force at break under tension of the n bearing elements made to buckle under compression. Two sidewalls () close space (), forming a closed cavity that can be pressurized.

A collapsible tire for a passenger vehicle, comprising at least one carcass reinforcement optionally associated with an inextensible crown reinforcement, itself radially on the inside of a tread, two beads and two sidewalls, said beads comprising at least one inextensible circumferential reinforcing element called a bead wire, said bead wire defining, when free of any stress, a mean line forming a substantially circular closed curve in a circumferential plane, wherein the invention is characterized in that the bead wire of each bead is flexible, wherein after the tire has been collapsed, the mean line of the bead wire simultaneously defines a first curvature, and a second curvature, the first and second curvatures being connected together by a third connecting curvature, the projection of said first, second and third curvatures of the collapsed tire onto an axial plane defining the two-dimensional envelope by way of a total perimeter P of less than or equal to [3&#xd7;(2H+A)], H being the height of the sidewall and A the width of the tire, and a collapsing method for the tire.

Growing community of inventors

Clermont-Ferrand, France

Florian Vilcot