Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissments Michelin

Michelin Recherche Et Techniques S.a.

Societe Detechnologie Michelin

Philippe Johnson

Alain Domingo

Fanny Barbotin

Sébastien Noel

Julien Metzger

Bopha Grisin

Olivier Lenepveu

Nizar Didane

Philppe Laubry

Jean-Luc Auger

A radial tire () for an agricultural vehicle, which has a speed index at least equal to D for a maximum speed equal to 65 km/h, the authorized inflation pressure of which during use on loose ground is less than or equal to 1 bar and the load index of which is at least equal to 158, the tread pattern of which comprises lugs with a radial height at least equal to 45 mm, having a crown reinforcement () with at most 4 crown layers (), each having reinforcing elements having a tensile breaking force at least equal to 32 daN and having an aramid strand and a nylon or PET textile fibre strand, the aramid strand having a tensile breaking force at least equal to 30 daN.

Tire for high-power agricultural vehicle

A tire comprising a crown reinforcement formed from at least two working crown layers and from at least one layer of circumferential reinforcing elements positioned radially between two working crown layers, the working crown layers adjacent to the layer of circumferential reinforcing elements being on each side of the equatorial plane and in the axial continuation of the layer of circumferential reinforcing elements coupled over an axial width, in order thereafter to be decoupled. A first additional layer of polymer blend having a width at least equal to the widthof the coupling zone and having a maximum thickness of less than two times the thickness of the layer of circumferential reinforcing elements is positioned radially under the working crown layer radially adjacent to and inside the layer of circumferential reinforcing elements and is at least partially radially superposed on the coupling zone of the working crown layers.

Heavy goods vehicle tire

A tire comprising at least two working layers and at least one layer of circumferential reinforcing elements. The layer of circumferential reinforcing elements comprises at least a central part and two axially exterior parts, the elastic modulus of the rubber compound with which the circumferential reinforcing elements of the central part are coated being less than the modulus of the rubber compound with which the circumferential reinforcing elements of the axially exterior parts are coated.

Tire for heavy-goods vehicle

Tire () for a heavy goods vehicle comprising a radial carcass reinforcement () anchored in each of the beads () to an anchoring structure (), comprising a circumferential reinforcement (), the carcass reinforcement () being partially wrapped around the anchoring structure (), the tire () also comprising a coupling reinforcement () comprising a first part () in contact with the carcass reinforcement () and being extended by a second part () in contact with the anchoring structure () as far as a point () radially on the outside of the anchoring structure (), located axially between the axially inner-most point () and the axially outermost point () of the anchoring structure (), the tire () also comprising a stiffening reinforcement () surrounding the coupling reinforcement () and running radially on the inside of the anchoring structure () and of the coupling reinforcement (), in which the axially outside end point () of said stiffening reinforcement () is located at a radial distance DR from the radially innermost point () of the circumferential reinforcement (), the radial distance DR being greater than or equal to 0.8 times the radial distance DS between the radially innermost and radially outermost points () of the circumferential reinforcement () and less than or equal to 1.2 times the radial distance DS.

Tire for heavy goods vehicle having a reinforced bead

A tire comprising at least two working layers and at least one layer of reinforcing elements. The layer of circumferential reinforcing elements comprises at least a central part and two axially exterior parts, the extent to which the circumferential reinforcing elements of the central part are penetrated by the rubber compound with which they are coated being less than the extent to which the circumferential reinforcing elements of the axially exterior parts are penetrated by the rubber compound with which they are coated.

Tire () for a heavy goods vehicle comprising a radial carcass reinforcement () anchored in each of the beads () to an anchoring structure (), comprising a circumferential reinforcement (), the carcass reinforcement () being partially wrapped around the anchoring structure (), the tire () also comprising a coupling reinforcement () comprising a first part () in contact with the carcass reinforcement () and being extended by a second part () in contact with the anchoring structure () as far as a point () radially on the outside of the anchoring structure (), located axially between the axially innermost point () and the axially outermost point () of the anchoring structure (), the tire () also comprising a stiffening reinforcement () surrounding the coupling reinforcement () and running radially on the inside of the anchoring structure () and of the coupling reinforcement (), wherein the axially outside end point () of said stiffening reinforcement () is located at a radial distance DR from the radially innermost point () of the circumferential reinforcement (), the radial distance DR being greater than or equal to 0.2 times and less than or equal to 0.6 times the distance DC between the radially outermost and radially innermost points () of the carcass reinforcement, and wherein, radially on the outside of the anchoring structure (), the minimum distance DT between the axially external portion () of the stiffening reinforcement () and the carcass reinforcement () is greater than or equal to 2 mm.

A tire with a radial carcass reinforcement comprising a crown reinforcement formed from at least two working crown layers of inextensible reinforcing elements and from at least one layer of circumferential reinforcing elements positioned radially between two working crown layers, the working crown layers adjacent to the layer of circumferential reinforcing elements being on each side of the equatorial plane and in the axial continuation of the layer of circumferential reinforcing elements coupled over an axial width, in order thereafter to be decoupled. A layer of polymer blend having a thickness greater than 1.5 mm over an axial width greater than 0.1&#xd7;d is positioned axially between the axially exterior end of the layer of circumferential reinforcing elements and the axially interior end of the coupling zone of the working crown layers.

A tire comprising at least two working layers and at least one layer of circumferential reinforcing elements positioned radially between two working crown layers. At least one layer of circumferential reinforcing elements has an axial width greater than 0.5&#xd7;S, and is made up of two parts separated axially from one another, and, axially between the two parts of the layer of circumferential reinforcing elements, two working crown layers are coupled over an axial width greater than 0.035&#xd7;S.

Tire for heavy vehicles

Branched synthetic polyisoprenes are described having a macrostructure and a microstructure very similar to those of natural rubber. According to one aspect, these polyisoprenes have an apparent stress F/Sgreater than or equal to 0.4 MPa at a relative elongation &#x3b1; of 150%, applied to a dumbbell-shaped test specimen consisting of the crosslinkable polyisoprene. According to another aspect, these polyisoprenes fulfill the relationship:Cotan &#x3b4;&#x2267;0.3761. &#x3b7;+0.15,:&#x2003;&#x2003;(i)

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Perignat sur Allier, France

Philippe Johnson