TREAD INCLUDING AT LEAST ONE WAVY GROOVE, AND METHOD FOR PRODUCING SAME

摘要

Tire for a heavy goods vehicle comprising a tread of total thickness E and total volume V, having a tread surface intended to come into contact with a roadway, at least one cavity or groove that is continuous in a main direction, and delimited by side walls connected by a bottom, a cross section, the points furthest towards the inside of the bottom of each cavity defining a bottom line, wherein each cavity or groove comprises a plurality of open sections open onto the tread surface in the new state and a plurality of closed sections, connected to the open sections being arranged in alternation, each closed section being spaced away from the tread surface by a bridge of rubber, wherein the points on the bottom line of said cavity or groove lie at distances between a minimum distance Dm and a maximum distance DM with respect to the tread surface, the bottom lineof each cavity or groove following a wavy geometry of positive amplitude equal to the difference (DM−Dm).

主权项

1. A tire for a heavy goods vehicle comprising:
a tread of total thickness E and total volume V, comprising:
a tread surface intended to come into contact with a roadway;at least one cavity or groove that is continuous in a main direction, this cavity or groove being delimited by side walls connected by a bottom, this cavity or groove having a cross section, the points furthest towards the inside of the bottom of each cavity defining a bottom line;each cavity or groove comprising:
a plurality of open sections that open onto the tread surface in the new state, anda plurality of closed sections connected to the open sections and arranged in alternation, such that each closed section is spaced away from the tread surface by a bridge of rubber,a bottom line of the said cavity or groove containing points that lie at distances between a minimum distance Dm and a maximum distance DM, these distances, which are measured on the tread in the new state with respect to the tread surface, being at most equal to the thickness E of the tread; wherein the bottom line of each cavity or groove follows a wavy geometry having a positive amplitude equal to the difference (DM−Dm) and having a wavelength less than a mean length of the contact patch measured under the conditions of use as set forth in the E.T.R.T.O. standard for the new tire, and wherein the bridge of rubber formed between each closed section and the tread surface is continuous.