Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements Michelin

Compagnie Generale Des Establissements Michelin

Compagnie Generale Des Etablissments Michelin

Richard Abinal

Mathieu Albouy

Patrick Pallot

Pierre Fevrier

Cyril Charreire

François-Xavier Bruneau

Eric Berger

Russell Shepherd

Jean-Jacques Drieux

Bernard Villeneuve

Jacky Pineau

Francois Hottebart

Adam Jara

Patrick Dayet

Gérard Crosnier

Gerard Crosnier

Sebastien Drap

Jean-Pierre Cowart Pompier

Anne-Laure Fraenkel

Thomas Emberger

Nicolas Delias

Vincent Dubourg

A method for estimating the overall wear of a tire having a crown, the crown comprising a tread having a mean thickness E, the tire delimiting an internal cavity, comprises the following steps: acquiring a transfer function F of the tire on a reference ground depending on influencing factors and the thickness E; acquiring a passage function β of the mounted assembly, said passage function being defined for a section of road; and in a measurement cycle, determining a force FX and a rate of slip g % at the wheel center of the tire, when running in a straight line involving variations in acceleration on the dry section of road; determining a load Zexperienced by the mounted assembly; determining a temperature Tof the mounted assembly; and determining an inflation pressure Pof the internal cavity.

Model for predicting wear and the end of life of a tire

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

Tire tread

Method of manufacturing a tire comprising a tread strip in which blind radial cuts are arranged in the blocks of rubber that form the tread pattern, comprising a step during which the cuts () are made in the unvulcanized tread strip () intended to cap the green tire. One or more blades () are raised to a temperature higher than the vulcanization temperature of the material of which the tread strip () is made are caused to penetrate the radially internal face () of the tread strip () for a sufficient period of time that they superficially vulcanize the walls of the cut in contact with the blade () so as to prevent the faces from sticking back together once the blade has been withdrawn from the cut.

Method and device for making blind grooves in an unvulcanized tread

Tire tread comprising a tread surface intended to come into contact with a roadway, this tread comprising at least one sipe extending in a main direction D and of mean width E, this sipe comprising in the main direction D at least one part sipe of shallow depth HF and at least one part sipe of great depth HG, the depth HF being less than the depth HG, each part sipe of shallow depth and each part sipe of great depth comprising an end region, this tread further comprising at least one insert oriented in a direction different from the main direction D of the sipe, this insert being positioned wholly within the thickness of the tread so as to be situated radially on the inside of a part sipe of shallow depth HF, this tread being such that at least the part sipe of shallow depth HF situated radially on the outside of the insert is provided, at its end region, with a widening forming a channel of maximum width W, this maximum width W being greater than the mean width E of the sipe.

Tread combining inserts and sipes

A method of estimating the temperature of the air in the internal cavity of a tire in which: The method ia applied to the detection of abnormal operating in particular of a running-flat system.

Method of estimating the temperature of the air in the internal cavity of a tire and application to the detection of abnormal operating of a running-flat system

A method of fitting a tire P and a removable tread support S on a one-piece wheel rim J, rim comprising a first rim seat, inclined outwards, and the tire P comprises a first bead and a second bead to be mounted respectively on the first and second rim seats, in which, before completion of fitting the support S on a rim bearing surface of the rim, the first bead is gripped at a given point and is moved radially outwards to radially separate this point on the first bead from the support S. The fitting of the support S on the rim bearing surface continues and the bead is released after completion of the fitting of the support S.

Method for mounting a tire on a rim

An assembly including a deformable, inextensible tread-bearing support S, which can be slipped on to a suitable rim bearing surface ( ). The bearing surface ( ) extends axially towards the inside of a first rim seat ( &prime;), which is in turn extended to the outside by a protrusion or hump ( &prime;) of low height. The first rim seat ( &prime;) is inclined towards the outside. A second rim seat ( &Prime;) having, viewed in meridian section, a generatrix, the axially inner end of which is located on a circle of diameter D&Prime; greater than the diameter of the circle on which is located the axially inner end D&prime; of the first rim seat ( &prime;). The two seats being, axially to the inside, extended by frustoconical portions ( ) of a height at least equal to 0.01 times the minimum diameter of the bearing surface ( ), and the generatrices of which form with the axis of rotation angles &agr; at least equal to 45&deg;. The rim bearing surface ( ) is provided with at least one circumferential protuberance ( ) arranged in a circumferential groove ( ) of the radially inner face of the tread bearing support S, such that the protuberance ( ) axially comes to bear and butt up against at least one lateral wall of the groove ( ).

Assembly consisting of a rim and a bearing support

The invention concerns a light safety support ( ) for a tire comprising a base ( ), a top ( ) and an annular linking body ( ) with a continuous support element around the circumference and a circumferential median plane, wherein the support element includes a plurality of partitions ( ), ( ) extending axially on either side of the circumferential median plane that are adapted in their central part relative to their lateral end parts to reinforce the support buckling strength under a radial load.

Growing community of inventors

Veyre-Monton, France

Richard Abinal