Patent ID: 8276629

Claim:
A tread having a running surface arranged to come into contact with a roadway during running, this tread being provided with raised elements, a plurality of these raised elements being provided with at least one first incision and at least one second incision, the at least one first incision being delimited by walls of rubbery material, each of said walls comprising at least two non-planar parts, each non-planar part being separated from the other non-planar parts by an intermediate part, said non-planar parts having geometric shapes exhibiting at least one undulation at the surface of the tread of total amplitude A and at least one undulation in the depth of the tread with total amplitude B, the intermediate part between two non-planar parts of a first incision having a geometry exhibiting at least one undulation in the depth of the tread of total amplitude B′ and no undulation on the surface of the tread, the at least one second incision being delimited by walls of rubbery material, each of said walls comprising at least two non-planar parts, each non-planar part being separated from the other non-planar parts by an intermediate part, said non-planar parts having geometric shapes exhibiting at least one undulation in the depth of the tread of maximum amplitude C, each intermediate part of the at least one second incision situated between two non-planar parts of said second incision having no deformation in relief, the at least one first incision intersecting at least one second incision to form at least one intersection and thus divide the raised element in which they are made into several volume elements, each intersection being created between an intermediate part of the at least one first incision and an intermediate part of the at least one second incision, the raised element provided with incisions being a block delimited by several lateral faces, the mean planes of the first incisions being substantially parallel to some of the lateral faces and the mean planes of the second incisions being substantially parallel to the other lateral faces so as to divide the raised element into several material elements of substantially the same volume, wherein the points of maximum amplitude of the at least one undulation in the depth of the first incisions are situated at between 25% and 50% of the depth of the incision measured from the running surface of the tread, and wherein there is no undulation in the depth of the first incisions outside of between 25% and 50% of the depth of the incision measured from the running surface of the tread.