The invention relates to a tread (1) for a tyre intended for being fitted on the drive axle of a heavy goods vehicle, said tread including a plurality of circumferential grooves (2) defining at least three ribs (4, 5, 6) each having a height and a width measured in the axial direction, the tread (1) being defined axially by two edge rows (7, 8), each rib (4, 5, 6) being provided with a plurality of incisions (41, 51, 61) capable of closing at least partially when passing in contact with a road surface, said incisions (41, 51, 61) opening onto each side surface of the rib such as to form two edges and having a depth at least equal to 50 % the height of the rib, said incisions (41, 51, 61) defining two-by-two a basic rib space (40, 50, 60) as well as a basic contact surface (400, 500, 600), said tread being characterised in that a hollow space (42, 52, 62) is formed on each basic space (40, 50, 60) defined by two incisions of a single rib, opening onto the contact surface when new, said hollow space (42, 52, 62) having a total area relative to the tread surface equal to 0.4 % to 1.5 % of the area of the basic contact surface (400, 500, 600) of said hollow space, said hollow space (42, 52, 62) having a depth equal to at least half the depth of the grooves, and in that said hollow space (42, 52, 62) is determined such as to remain open when passing in contact in order to enable the catchment of liquid that may be present on the road surface.
Tread for tyre of a drive axle of a heavy goods vehicle and tyre
2015-04-01
Patent
Electronic Resource
English
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |
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