Compagnie Générale Des Etablissements Michelin-Michelin & Cie

Compagnie Generale Des Establissements

Patrick Lurois

In order to improve the wear of the trailing edges of the relief elements of a tread (1) for 'heavy vehicle' tires, which elements are defined in the axial direction by circumferential grooves and in the circumferential direction by incisions (30) of a width other than zero and at most equal to 3 mm, said incisions (30) are inclined with respect to the normal (P) to the surface of the tread by an angle .alpha. of between 5.degree. and 25.degree. so that the resultant force (F.sub.F, F.sub.M) exerted by the ground on the tread tends to straighten the incisions (30) towards a zero inclination. The inclination of the incisions (30) is particularly advantageous in the case of a tread (1) provided with 'wide' circumferential grooves having a step (4). Application for steering, load-bearing or driving tires.

Tread for heavy-vehicle tire in which the central ribs are provided with

Tire

In order to assure the geometric uniformity of a tire molded with a segment old when the sculpturing of said tire includes blocks 11 surrounded by recesses formed by grooves 15 and incisions 16, the said grooves 15 are thinned at the level of the joint planes 550 between segments. Furthermore, wear indicators 17 are arranged at the level of the joint planes 550 between segments.

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Cebazat, France

Patrick Lurois