Compagnie Generale Des Etablissements Michelin

Richard Cornille

Sébastien Rigo

Bastien Limozin

Henri Barguet

Frédéric Perrin

Florian Vilcot

Gael Roty

Jacky Pineau

Hervé Ferigo

Christophe Le Clerc

Francis Aubarede

Olivier Reix

Xavier Legrand

Sabrina Rih

Christophe Hombert

Marc-Antoine Colot

Gregor Hug

Augustin Bosquet

Florian Lachal

Jeremy Guillaumain

Jérémy Guillaumain

Hubert Ostyn

Guillaume Tanchaud

Geneviève Pineau

An assembly () comprises: a first structure () formed by first filamentary elements (), a second structure () formed by second filamentary elements (), a supporting structure () comprising supporting filamentary elements linking the first filamentary elements () and the second filamentary elements (), and at least one filamentary securing element () interlaced with the first filamentary elements () and the second filamentary elements (), one of the ends () of the securing element () being free to slip relative to the first and second filamentary elements ().

Assembly for a tire comprising a three-dimensional fabric or knit and a securing element

A tire () comprises a crown () comprising a tread (), a crown reinforcement (), a carcass reinforcement (), two side walls (), two beads (), each side wall () linking each bead () to the crown (), the crown reinforcement () extending in the crown () in a circumferential direction (Z) of the tire (). The textile wire-like hoop reinforcer element (), the wire-like working reinforcer elements () and the wire-like carcass reinforcer elements () are arranged so as to define, in projection on the equatorial circumferential plane (E), a triangular mesh. The textile wire-like hoop reinforcer element comprises a core composed of a first strand comprising at least one monofilament, and a layer comprising at least two second strands, each second strand comprising at least one monofilament, each second strand of the layer being helically wound around the core.

Tire comprising specified hooping ply

The invention relates to a tyre () comprising a hooping ply () comprising at least one textile wire-like hoop reinforcer element making an angle strictly less than 10° with the circumferential direction (Z) of the tyre (). The bonded textile wire-like reinforcer element has, before the step of production of the hooping ply (), a tangent modulus less than or equal to 5 cN/tex/% for any elongation less than or equal to 3%. The textile wire-like hoop reinforcer element has, once extracted from the tyre (), a tangent modulus greater than or equal to 5 cN/tex/% for any elongation greater than or equal to 4%.

Pneumatic tire comprising specified hoop reinforcer element

A method for manufacturing a bonded reinforcing textile filamentary element () comprising a core and a layer of strands is disclosed. The textile filamentary element in the natural state is assembled. A textile filamentary element in the natural state or pre-bonded textile filamentary element is obtained. The filamentary element in the natural state or pre-bonded filamentary element is coated with an external layer of at least one heat-crosslinkable adhesive composition. The filamentary element in the natural state or pre-bonded filamentary element that is coated with the external layer is thermally treated so as to crosslink the adhesive composition in order to obtain the bonded filamentary element (). The steps of coating with and of thermally treating the external layer of the filamentary element in the natural state or pre-bonded filamentary element are carried out such that, for an elongation equal to 30% of the elongation at break of the filamentary element in the natural state, the tangent modulus of the bonded reinforcing textile filamentary element () is increased compared with the tangent modulus of the filamentary element in the natural state.

Method for producing a threadlike reinforcement element

A cord () comprises a single layer () of helically wound metal filamentary elements (). The metal filamentary elements define an internal enclosure () of the cord of diameter Dv. Each metal filamentary element () has a diameter Df and a helix radius of curvature Rf. With Dv, Df and Rf being expressed in millimetres, the cord satisfies the following relationships: 9&#x2264;Rf/Df&#x2264;30 and 1.30&#x2264;Dv/Df&#x2264;2.10.

Highly compressible open cord

A method for manufacturing (S) a subassembly () for a tire () comprising the following substeps: providing an assembly comprising a supporting structure () comprising supporting filamentary elements linking a first structure () of filamentary elements and a second structure () of filamentary elements, aligning (S) the first structure () and the second structure (), securely fixing (S) the first structure () onto the second structure () using a securing element (), and cutting (S) the assembly () along the securing element () so as to separate said securing element () from the rest of the assembly () and to obtain at least one subassembly () without securing element ().

Method for manufacturing a sub-assembly for a tire comprising a three-dimensional fabric or knitted material and using a securing element

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 method for producing a wire element by interlacing at least a first strand and a second strand, during which strand tension control is effected by includes defining an assembly tension set point representative of a state of longitudinal tension to be obtained in the first strand when said first strand reaches the assembly point. The method also includes measuring the actual assembly tension applied in the first strand, said measurement being taken at a first tension measurement point located along the first strand and upstream of the assembly point. The method proceeds with operating a tension regulating member such as a capstan, which acts on the first strand upstream of the assembly point such as to cause the actual assembly tension within said first strand to converge automatically towards the assembly tension set point.

Twisting method and installation with tension control for the production of reinforcing cords for tires

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 high modulus textile cord () with at least triple twist (T1, T2, T3) comprises at least N strands (), N being greater than 1, twisted together with a final twist T3 and a final direction D2, each strand being made up of M pre-strands (), M being greater than 1, themselves twisted together with an intermediate twist T2 (T2a, T2b, T2c, T2d) and an intermediate direction D1 opposite to D2, each pre-strand itself consisting of a yarn () which has been twisted on itself beforehand with an initial twist T1 (T1a, T1b, T1c) and the direction D1, in which at least half of the N times M yarns have an initial elastic modulus denoted Mi which is greater than 2000 cN/tex. This textile cord can advantageously be used as a reinforcer in tires for vehicles, particularly in the belt or carcass reinforcement of these tires.

Growing community of inventors

Clermont-Ferrand, France

Richard Cornille