Tire tread having incisions

摘要

A tread for a tire with raised elements delimited by cuts, at least one of these raised elements having a sipe of a maximum depth at most equal to the thickness of the tread, and running in a main direction determined by the ends of the sipe on the tread surface in the as-new condition and a secondary direction running into the thickness of the tread, having a first part, running in the secondary direction between the contact face in the as-new condition and a depth at least equal to 40% of the maximum depth and a second part extending the first part into the thickness of the tread, and extending over a depth. The second part has, in the main direction of the sipe, at least one first portion and at least one second portion, each having a length less than the length (L).

主权项

1. A tread made of a rubber compound for a tire, this tread having a thickness E and comprising a plurality of raised elements delimited by cuts, each raised element comprising:
a contact face intended to come into contact with the road surface, and lateral faces intersecting this contact face along edge corners,wherein a collection of contact faces of the raised elements forms a tread surface of the tread,wherein at least one of these raised elements comprises at least one sipe of a maximum depth (H) at most equal to the thickness (E) of the tread, this at least one sipe running in a main direction determined by the ends of the line of the at least one sipe on the tread surface in the as-new condition and a secondary direction running into the thickness of the tread,wherein this at least one sipe is made up of a first part and a second part,
wherein the sipe first part runs in the secondary direction between the contact face in the as-new condition and a depth (H1) at least equal to 40% of the maximum depth (H), and wherein the sipe second part extends the sipe first part into the thickness of the tread, wherein this sipe second part extends over a depth (H2), wherein the sipe first part, of total length (L) measured on the tread surface when the tread is in the as-new condition in the main direction, divides the raised element over the depth (H1) into two raised-element parts which are disjointed from one another, wherein: the sipe second part comprises, in the main direction of the sipe, at least one first portion and at least one second portion, these two portions each having a length less than the length (L), each first portion being formed of a sipe comprising at least two branches disjointed from one another, wherein these at least two branches are spaced from one another by a maximum distance (D1), and wherein the at least two branches of a first portion are not offset from each other relative to the main direction of the sipe, and each second portion, situated in the extension of a first portion in the main direction of the sipe and disjointed from any first portion, being formed in such a way as to create a mechanical connection between the extensions into the depth over the height (H2) of the raised-element parts that are disjointed from one another between the contact face and the depth (H1).