Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissments Michelin

Pierre Fevrier

Richard Abinal

Patrick Pallot

Mathieu Albouy

Cyril Charreire

François-Xavier Bruneau

Hervé Martin

Gérard Fandard

Tire comprising at least one working layer (). The radially outermost one thereof comprises at least one undulation () radially on the outside of the points of the working layer () that are in line with the centre of the bottom face () of the major groove () closest to undulation (). The undulation () of the radially outermost working layer () is such that, over at least 10% of the radially outer surface (ROS) of the said working layer (), the radial distance (do) between the radially outer surface (ROS) and the tread surface () is at least 1 mm less than the radial distance (dc) between the radially outer surface (ROS) and the tread surface (), which is the distance in line with the centre of the bottom face () of the major groove () closest to the said undulation ().

Tire comprising working layers having an improved architecture

A tire () for a vehicle has a tread surface having a transverse radius RT and comprises a crown layer () that comprises at least one undulation () in line with a rib (). The undulation () is such that it is radially on the outside of the points of the undulated layer in line with the center of the bottom face of the circumferential furrow () closest to the undulation () and has an amplitude at least equal to 1 mm. The radial distance (da) between at least one contact edge corner of a rib () in line with which an undulation is located and the transverse radius RT of the rib is at least equal to 0.2 mm and at most equal to 2 mm.

Tire comprising optimized architecture and tread pattern

Tire comprising major grooves with a depth at least equal to 4 mm and with a width at least equal to 1 mm. The radially outermost working layer () comprises at least one undulation (). The undulation () is such that the undulation () portion of the working layer () represents at least 10% of the surface of the working layer (), has an amplitude of at least 1 mm and is radially on the outside of the points of the working layer () that are in line with the bottom face () of the major groove () closest (). All the layers of material () making up the radial stack of the crown structure (S) have mean surfaces parallel to that of the radially outermost working layer ().

Tire having an optimized architecture

A method for simulating the behavior of a tire mounted on a vehicle in running conditions on the ground, wherein a mechanical model is provided for essentially computing the longitudinal (Fx) and transverse (Fy) stresses transmitted by the tire between the ground and the vehicle in accordance with dynamic parameters related to the physical conditions of the tire running and use and in accordance with physical tire-specific parameters. The mechanical model is set and solved in an iterative manner, under the assumption that the tire in contact with the surface of the ground has an adherence contact area and a sliding contact area and under the assumption that there is a unique x-coordinate point b that is indicative of the transition between the two contact areas.

Method for the simulation of the physical behavior of a tire rolling on the ground

A process for simulating the physical behavior of a vehicle tire rolling on the ground with which the tire tread has an area of contact including at least one adherent contact zone and at least one sliding contact zone, which process includes at least modeling operations, wherein the modeling operations, by applying physical laws that are known and/or developed by specific experimentation, as a first model, a model of the longitudinal forces (Fx), the transverse forces (Fy), and a self-alignment torque (Mz), including an adherence coefficient and a shear modulus of the rubber of the tire, and on the basis of dynamic parameters associated with the physical conditions of rolling and use of the tire, in which the self-alignment torque is associated with the intensity of the longitudinal and transverse forces and their distribution in the contact area, a second model of a local heating model expressing variations in a temperature of contact of the tread with the ground, and a third model of a general heating and thermal flux model, in which said third model in a peripheral tread temperature and an internal tire temperature, a coefficient of thermal conductivity of the tread, and phenomena with a thermodynamic component such as internal deformations of the tire, heat transfers between the tire and its environment, and slip of the tread on the ground, in which at least the adherence coefficient and the shear modulus are involved in the first models as variable.

Growing community of inventors

Clermont-Ferrand, France

Pierre Fevrier