Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Societe Detechnologie Michelin

Claude Audebert

Sébastien Fugier

Cyril Guichon

Daniel Fabing

Matthieu Durat

Eric Berger

Sebastien Fugier

Mattieu Bonnamour

A tire () for driving on ice, comprising: a tread () having a rolling surface with a groove, a stud () with a part () thereof projecting from the rolling surface and having a minimum cross section Sm; a conduit (-) that forms, on the rolling surface of the tire, two opposing edges (), the conduit opening into the groove and/or onto a lateral face of the tread; wherein, for each stud, the sum of the mean cross sections Sn of the conduits, each mean cross section Sn being measured at right angles to one of the opposing edges formed by the conduit, is greater than or equal to half the minimum cross section Sm of that part of the stud that projects from the tread.

Tire for driving on ice

A tire () for driving on ice, comprising: a tread () having a rolling surface configured to come into contact with the ground when the tire is rolling along; at least one stud () having a longitudinal axis (A-A), a part of the stud projecting from the rolling surface, the intersection between the stud and the plane tangential to the portion of the rolling surface around the stud forming a contour C, that part of the stud that projects from the rolling surface having a minimum cross section Sm, Sm corresponding to the smallest cross section of the said part in any plane containing the radial direction that passes through the point of intersection between the longitudinal axis of the stud and the plane tangential to the portion of the rolling surface around the stud; at least one recess () in the tread forming, on the rolling surface, a contour G, the recess being associated with the stud in that the minimum distance D between the contours C and G is less than or equal to 1 cm; in which, for each stud, the sum of the volumes Vn of the recesses associated with the stud, expressed in mm, is greater than or equal to the product of the minimum cross section Sm of that part of the stud that projects from the tread, expressed in mm, multiplied by a length of 50 mm.

Directional tire tread having a rolling surface, this tread being provided with a plurality of incisions bounded by mutually opposing walls, each of said walls entering the rolling surface in such a way as to form an edge called the leading edge of an element of material, corresponding to the edge that enters the contact patch first, and an edge called the trailing edge of the same element of material, corresponding to the edge that enters the contact patch after the leading edge, each incision comprising at least one segment bounded by mutually opposing walls that make, with a direction perpendicular to the rolling surface passing through the intersection of the incision with the rolling surface, a negative average angle &#x3b1; whose absolute value is less than 55&#xb0;, this tread being characterized in that this segment of negative angle &#x3b1; exits the rolling surface via an enlarged end portion bounded by mutually opposing first and second faces, the angles of the first face and second face being positive and not equal to each other.

Directional tire tread with modified incisions

A tire () for driving on ice, comprising: a tread () having a rolling surface configured to come into contact with the ground when the tire is rolling along, and two lateral faces (), this tread comprising at least one groove () in the rolling surface; at least one stud () having a longitudinal axis (), a part () of the stud projecting from the rolling surface, the intersection between the stud and the plane tangential to the portion of the rolling surface around the stud forming a contour C, that part of the stud that projects from the rolling surface having a minimum cross section Sm, Sm corresponding to the smallest cross section of the said part in any plane containing the radial direction that passes through the point of intersection between the longitudinal axis of the stud and the plane tangential to the portion of the rolling surface around the stud; at least one conduit (-) that forms, on the rolling surface of the tire, at least two opposing edges (), the minimum distance D between the conduit and the contour C being less than or equal to 1 cm, the conduit opening into the groove and/or onto a lateral face of the tread; wherein, for each stud, the sum of the mean cross sections Sn of the conduits, each mean cross section Sn being measured at right angles to one of the opposing edges formed by the conduit, is greater than or equal to half the minimum cross section Sm of that part of the stud that projects from the tread.

Growing community of inventors

Les Martres sur Morge, France

Claude Audebert