EVOLVING TREAD FOR A TIRE

摘要

A tread for a heavy vehicle tire of total thickness PMU this tread when new having a tread surface is provided and disclosed herein. The tread includes at least one cut opening in the initial condition onto the tread surface, this cut being such that it includes an external part having the form of a groove in the main direction, this groove having a mean depth Pe less than 80% of the thickness PMU, an internal part forming the bottom of the cut, this internal part having the shape of a channel of mean width Le and mean height He, this channel being intended to form a new continuous groove when the part wear of the tread reaches at most 80% of the thickness PMU.

主权项

1. A tread for a heavy vehicle tire of total wearing thickness PMU corresponding to a thickness of material worn away during running, the tread having a tread surface in contact with a roadway the tread including at least one cut opening in the initial condition onto the tread surface the cut comprising:
an external part having the form of a groove in the main direction, the groove opening onto the tread surface when new and having, on this tread surface, a width Le such that it does not close up in the contact patch and a mean depth Pe less than 70% of the thickness PMU; an internal part forming the bottom of the cut, this internal part having the shape of a channel of mean width Le and mean height He, the channel forming a new continuous groove when the part wear of the tread reaches at most 80% of the thickness PMU; an intermediate part making a connection between the internal part and the external part, the intermediate part including an alternation—in the main direction of the groove that forms the external part, a succession of wide parts and of narrow parts, the wide parts not closing when they enter the contact patch and the narrow parts closing when they enter the contact patch, thus limiting the reduction in stiffness of the tread caused by the presence of this cut, the tread being characterized in that the wide parts of the intermediate part (X) form oblique channels connecting the external groove part to the internal channel part, these wide parts being disjointed from one another.