Tire tread with improved rigidity

Abstract

Tire tread having at least two wearing layers, provided with at least one continuous groove having in the as new condition a plurality of external cavities opening onto the tread surface and a plurality of internal cavities placed radially and completely inside the tread surface, such that: the difference between the mean lengths of the internal cavities and of the external cavities is at most equal to 20% of the longest mean length, the difference in the mean cross-sectional areas of the internal and external cavities is at most equal to 20% of the largest mean area, each external cavity of a continuous groove being connected to at least two internal cavities of the same groove and having a plurality of incisions opening onto the tread surface, each connecting two consecutive external cavities of the same groove and at least two connecting channels and at least one internal cavity.

Description

technical field [0001] The present invention relates to tire treads, and more particularly to tread blocks for such treads and to tires provided with such treads, which tires have a longer lasting ability to remove ground water from road surfaces in rainy weather , and these treads were not compromised in terms of wear rate. Background technique [0002] It is well known that the use of tires in wet weather driving conditions requires that the contact area between the tire and the road surface be cleared of water as quickly as possible in order to ensure that the material of which the tire is made is in contact with the road surface. Any water that is not pushed ahead of the tire flows or is partially collected by the grooves and cuts formed in the tire tread. [0003] definition: [0004] The tread block of the tread here refers to the geometry of that part of the tread intended to come into contact with the road surface, the tread block being delimited by convex portions...

AI Technical Summary

Problems solved by technology

[0015] Therefore, creating multiple grooves on the tread has the disadvantage that, for a given width of the tread, the amount of tread material is reduced, thus reducing the service life of the tire due to the increased wear rate

The above-mentioned decrease in stiffness at the location where the grooves occur leads to an increase in the deformation and reduces the wear properties of the tread: for a low determined running distance, a greater wear is observed (which corresponds to an increase in the wear rate of the tread correspond)

Moreover, an increase in rolling resistance is also observed and, therefore, an increase in the fuel consumption of vehicles equipped with such tires due to the increase in hysteresis losses associated with the deformation cycles of the material constituting the tread

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