Evolving tread for a tyre

Abstract

Tread (10) for heavy goods vehicle tyre comprising, over a first axial part (M) a groove (2, 4) that is wavy in the thickness and continuous in a first direction, and grooves (6, 7) that are wavy in the thickness and continuous in a second direction and connected to a groove (2, 4) that is wavy in the first direction and, over a second axial part (B) of the tread a groove (1, 5) that is wavy in the thickness and continuous in a third direction and grooves (6, 7) that are wavy in the thickness and continuous in a fourth direction and connected to a groove (1, 5) that is wavy in the third direction, this tread being such that, when new, the parts that are open onto the tread surface in the first axial part (M) are connected to one another to form a continuous surface network and in that the parts that are open onto the tread surface in the second axial part (B) are discontinuous with one another and, once a partial wear state has been crossed, the parts that are open onto a new tread surface (100') in the second axial part (B) are connected to one another to form a continuous surface network and in that the parts that are open onto the new tread surface (100') in the first axial part (M) are discontinuous with one another.

Description

technical field [0001] The present invention relates to tire treads, more particularly to the design of the tread pattern of these treads and to tires provided with such treads which have a permanent ability to drain away the standing water present on the road in rainy weather The ability of these treads has improved wear properties. Background technique [0002] As is known, rainy driving conditions require water to be removed as quickly as possible from the contact patch in which each tire contacts the road in order to ensure the tread is in contact with the road. The water that is not pushed forward of the tire flows partly along the grooves and sipes formed in the tire tread in the circumferential direction or in the lateral direction. [0003] A cut is generally referred to as a groove or a sipe and corresponds to a space defined by walls of material facing each other and moving away from each other at a non-zero distance (referred to as "cut width"). [0004] A groov...

AI Technical Summary

Problems solved by technology

In the presence of grooves, the reduction in stiffness leads to an increase in deformation and to a reduction in the wear behavior of said tread: greater wear is observed for a fixed distance traveled (this corresponds to the increase in wear rate)

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