Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Societe Detechnologie Michelin

Jean-François Parmentier

Hichem Rehab

Jose Merino Lopez

Nathalie Salgues

Aurore Lardjane

Vincent Martin

Jose Merino-Lopez

Pierrick Travert

Claudia Navarro-Losada

Tire comprising a crown reinforcement formed of two working crown layers having unequal axial widths, layer C of rubber compound between ends of the working crown layers, layer S of polymer compound in contact with at least one working crown layer and in contact with the carcass reinforcement and the crown reinforcement comprising a layer of circumferential reinforcing elements arranged radially between two working crown layers. Distance d between the end of the axially narrowest working layer and the working layer separated from the axially narrowest working layer by the layer C is 1.1&#xf8;&#x3c;d&#x3c;2.2&#xf8;, &#xf8; being the diameter of the reinforcing elements of the layer of circumferential reinforcing elements, in a meridian plane. The thickness of layer C is substantially constant and the complex dynamic shear modulus G*, measured at 10% and 60&#xb0; C. on the return cycle, of layer S is greater than 1.35 MPa.

Tire comprising a layer of circumferential reinforcement elements

The invention relates to a tire comprising a crown reinforcement formed of at least two working crown layers each formed of reinforcing elements inserted between skim layers of rubber compound, a first layer S of polymer compound being in contact with at least one working crown layer and in contact with the carcass reinforcement and the crown reinforcement comprising at least one layer of circumferential reinforcing elements. In accordance with the invention, the elastic modulus under tension at 10% elongation of at least one skim layer of at least one working crown layer is less than 8.5 MPa, the maximum value of tan(&#x3b4;), denoted tan(&#x3b4;)max of the said at least one skim layer of at least one working crown layer is less than 0.100, and the complex dynamic shear modulus G*, measured at 10% and 60&#xb0; C. on the return cycle, of the said first layer S of polymer compound is greater than 1.35 MPa.

Tire comprising a crown reinforcement formed of at least two working crown layers each being formed of reinforcing elements inserted between two skim layers of rubber compound, a first layer S of polymer compound being in contact with at least one working crown layer and in contact with the carcass reinforcement and the crown reinforcement comprising at least one layer of circumferential reinforcing elements. The elastic modulus under tension at 10% elongation of at least one skim layer of at least one working crown layer is greater than 9 MPa, the maximum value of tan(&#x3b4;), denoted tan(&#x3b4;)max, of the at least one skim layer of at least one working crown layer is less than 0.100 and the complex dynamic shear modulus G*, measured at 10% and 60&#xb0; C. on the return cycle, of the first layer S of polymer compound is greater than 1.35 MPa.

Tire comprising a layer of circumferential reinforcing elements

Tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements, a first layer C of rubber compound being placed between at least the ends of the said at least two working crown layers, a second layer S of polymer compound being in contact with at least one working crown layer and in contact with the carcass reinforcement and the crown reinforcement comprising at least one layer of circumferential reinforcing elements. The elastic modulus under tension at 10% elongation of the first layer C is less than 8 MPa, the maximum tan(&#x3b4;) value, denoted tan(&#x3b4;), of the first layer C is less than 0.100, and the complex dynamic shear modulus G*, measured at 10% and 60&#xb0; C. on the return cycle, of the said second layer S of polymer compound is greater than 1.35 MPa.

A tire comprising a crown reinforcement formed of at least two working crown layers each one formed of reinforcing elements inserted between two skim layers of rubber compound, a first layer S of polymer compound being in contact with at least one working crown layer and in contact with the carcass reinforcement and the crown reinforcement comprising at least one layer of circumferential reinforcing elements. The elastic modulus under tension at 10% elongation of the layer C is greater than 9 MPa, the maximum value of tan(&#x3b4;), denoted tan(&#x3b4;)max, of the layer C is less than 0.100 and the complex dynamic shear modulus G*, measured at 10% and 60&#xb0; C. on the return cycle, of the first layer S of polymer compound is greater than 1.35 MPa.

Tread for pneumatic tires

A tire includes, among the conventional tread pattern elements, at least one measuring element having a central zone and an encircling zone. In normal operation, the central zoneof a measuring element slides over the ground while, conversely, the tread as a whole does not slide over the ground. Measurements are carried out of the maximum adherence potential with the ground, at any moment, due to the central zone of a measuring element. In an alternative embodiment, the measuring element may comprise a circumferentially extending rib(s) or tread block(s) whose ground contact surface(s) is spaced at a lesser radial distance from the wheel axle than the spacing of the ground contact surfaces of the conventional tread blocks.

Measurement of adherence between a vehicle wheel and the roadway

A tire comprising a tread having a tread pattern having a preferred running direction R. The tread pattern is formed by a plurality of blocks arranged in at least three rows of generally circumferential orientation, the axially outermost rows defining the edges of the tread enclosing at least one intermediate row of blocks. Each block has a block length L and a contact face delimiting, with the continuations of the lateral faces of the block, a complementary volume V with a virtual cylinder C, C' enveloping the block. The center of gravity G of the volume V is situated at a distance Dfrom the mid-plane M, M&#x2032; of the block dividing the block into two substantially equal volumes. The tire is characterized in that:

Growing community of inventors

Clermont-Ferrand, France

Jean-François Parmentier