TYRE WITH EVOLVING ASYMMETRICAL SCULPTED DESIGN

摘要

Passenger vehicle tire having a tread extended on either side by sidewalls, this tread being provided with an asymmetric tread pattern with respect to a median plane that divides this tread into two parts with the same axial width, this axial width being measured in a direction parallel to the axis of rotation, an external part and an internal part, this external part being situated between this median plane and the sidewall intended to be positioned on the outside of a vehicle, and the internal part being situated between the same plane and the sidewall intended to be positioned towards the inside of the same vehicle, the internal part and the external part each having at least one void that forms a groove or is intended to form a groove when the tread has partially worn away, these voids defining, in the new state and for each (internal and external) part, a total voids volume Vi0 and Ve0, respectively, and a voids surface ratio Ti0 and Te0, respectively, these ratios being other than zero and such that, in the new state, there is a ratio R0 between the voids volume of the internal part and the voids volume of the external part, and for each degree of wear (U) chosen between the initial state and the wear limit of the tread there is a ratio RU between the voids volume of the internal part and the voids volume of the external part, this tire being characterized in that the ratio RU is greater than the ratio R0 at least starting from a degree of wear of 80% measured over the thickness of the tread to be worn away.