Winter tire
AssigneeCompagnie Generale Des Etablissements Michelin
InventorsYves Herbelleau, Charles Flechtner
Life of this patent
Estimating the term…
Abstract
Tire intended for winter travel, having a tread comprising relief elements provided with slits inclined with respect to the normal to the tread and which are close to each other and form strips between each other, is improved due to the fact that, when the tire is not under load, the slits are inclined with respect to said normal by an angle at most equal to 45.degree. in the direction of the tangential stresses on the tire exerted by the ground and due to the fact that these slits have a width which is other than zero.
Claims7
A tire intended for winter travel, having a tread comprising relief elements bounded by grooves and provided with consecutive slits inclined with respect to the outer normal to the tread which are close to each other and form strips between each other, characterized by the fact that
- (a) the slits are located in the central zone of the tread width and in the two lateral zones of the tread width;
- (b) the depth of the slits is about equal to the depth of the grooves;
- (c) when the tire is not under load, the slits which are located in the central zone are inclined with respect to said normal by an angle at most equal to 45.degree. in the direction opposite the direction of forward rotation of the tire so as to be active in braking and the slits which are located in the two lateral zones are inclined with respect to said normal by an angle at most equal to 45.degree. in the direction of forward rotation of the tire so as to be active in longitudinal acceleration;
- (d) the slits have a width which is other than zero and such that, when the tire is under load and and crushed on the ground, the slits are closed;
- and
- (e) the tread comprises a radial carcass reinforcement surrounded by a tread reinforcement.
Dependencies are inferred from the claim text.