Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Benoit Durand-Gasselin

Olivier Muhlhoff

Mathieu Vandaele

Masayoshi Nomura

Frédéric Bourgeois

Matthieu Bonnamour

Kazutaka Yokokawa

Serge Lefebvre

Fabien Hellot

Marie-Laure Francois

A tire for a vehicle comprises a tread (), of which the central part of the tread () comprises at least two rubber compounds (), making up at least 90% of its volume. The first compound () is radially on the outside of the second compound () and makes up at least 40% and at most 60% of the volume of the central part. The second rubber compound () has a Shore hardness DS2 at least equal to 5 plus the Shore hardness DS1 of the first compound () and dynamic losses at a temperature of 0° C. and 23° C. that are at least equal to those of the first rubber compound (). The axially outer parts of the tread are made up of a third compound () capable of touching the ground, having a stiffness and a hysteresis that are lower than those of the first compound.

Pneumatic tire with improved tread

Tire tread comprising elongate block () of rubbery material and extending in a circumferential direction of the tire. Elongate block () comprises a ground contact surface () delimited first and second lateral walls (). Elongate block () comprises a plurality of oblique cutouts () that open onto either the first or second lateral wall s and extend as far as cutout ends () which do not open onto said lateral walls (). The cutouts of the plurality of cutouts () are distributed over the contact surface () of the block such that when a cutout () reaches its cutout end (), another cutout () starts out from a lateral wall (), at a same circumferential level (N) on the elongate block (). The cutouts () are sipes.

Tire tread comprising a block having a plurality of cutouts

Tire tread comprising elongate block () of rubbery material extending in a circumferential direction (X) when the tread () is mounted on the tire. The elongate block () comprises a ground contact surface () delimited by first and second lateral walls (), with a plurality of cutouts () that open onto it. The cutouts () extend in an oblique direction from the first lateral wall () in the direction of the second lateral wall () as far as cutout ends (). For at least one cutout () that opens onto the first lateral wall (), its end () does not open onto the second lateral wall (), and when this cutout () reaches its cutout end (), another cutout () starts out from the first lateral wall (), at a same circumferential level (N) on the elongate block (). The cutouts () are sipes.

Tire tread comprising elongate block () of rubbery material extending in a circumferential direction of the tire. Elongate block () comprises ground contact surface () delimited by first and second lateral walls (). Elongate block () comprises successive sets of cutouts () in the circumferential direction, each set extending in an oblique direction and opening onto the first and second lateral walls, and distributed over the ground contact surface such that, when a set of cutouts reaches second lateral wall (), another set of cutouts starts out from first lateral wall () at the same circumferential level. Each set of cutouts comprises two cutouts, each one extending as far as a cutout end () which does not open onto a lateral wall. Ends such two cutouts are disposed at the same circumferential level. Cutouts of the same set of cutouts do not overlap in a transverse direction.

The aspects disclosed herein relate to a tread for a tire including at least one block of rubbery material of width W and length L with L&#xbb;W. This block extends in a circumferential direction (X) when the tread is mounted on the tire, the block including a contact surface intended to come into contact with the ground and a first lateral wall and a second lateral wall delimiting this contact surface. The block further includes a plurality of sipes opening onto the contact surface of the block, with each sipe extending over the contact surface in an oblique direction opening onto the first lateral wall and onto the second lateral wall, the sipes of the block being oriented in the same direction. The sipes are distributed over the contact surface of the block in such a way that when one sipe reaches the second lateral wall another sipe starts out from the first lateral wall at the same circumferential level (N) on the block, and each sipe includes at least two parts.

Tread comprising a block having a plurality of sipes

Disclosed herein is a tread for a tire. The tread includes at least one elongate block of rubbery material of width W and length L with L&#x3e;&#x3e;W. This elongate block extends in a circumferential direction (X) when the tread is mounted on the tire. The elongate block includes a contact surface intended to come into contact with the ground and a first lateral wall and a second lateral wall delimiting this contact surface. The elongate block includes a plurality of sipes opening onto the contact surface of the elongate block, with each sine extending in an oblique direction opening onto the first lateral wall and onto the second lateral wall. The sipes are distributed over the contact surface of the block in such a way that when one sipe reaches the second lateral wall another sipe starts out from the first lateral wall, at a same circumferential level (N) on the elongate block. With the sipes delimiting sub-blocks in the elongate block, at least two of these sub-blocks are configured differently in the tread.

Growing community of inventors

Clermont-Ferrand, France

Benoit Durand-Gasselin