IMPROVEMENT TO NOISE ATTENTUATOR DEVICES FOR TYRES

摘要

A tire comprising a tread having a running surface, and at least one groove of generally circumferential orientation and a plurality of relief elements, each of which has a contact face with a transverse width Lt and lateral walls, at least one being provided with a plurality of devices for attenuating resonance noise, being formed in a relief element and comprising a cavity of elongate shape having a total length Lc and a total volume Vc, opening onto a lateral wall, having a total length Lc which is greater than the transverse width Lt, and a geometry comprising several cavity portions connected together, wherein the length Lc equal to the sum of the lengths of all the cavity portions, being extended over the whole of its length Lc by a sipe extending radially outwards opening onto the running surface, this tread being such that the sum Ly of the lengths projected in the transverse direction of each cavity is at least 1.5 times greater than the sum Lx of the lengths projected in the circumferential direction of each cavity.