| 摘要 |
A tread ( 1 ) for steer axle tires for a heavy vehicle, the tire having a preferred direction of travel, the tread comprising grooves ( 2 ) of generally circumferential orientation defining at least three ribs ( 30, 31, 32, 33, 34 ), two of the ribs forming the edges ( 30, 34 ) of the tread, some of the intermediate ribs ( 31, 32, 33 ) being provided with a plurality of incisions ( 41, 42, 43 ), of general transverse orientation and substantially parallel to each other, the incisions having an average inclination other than zero relative to the direction perpendicular to the running surface of a new tread, this tread being characterised in that, when viewed in a section plane perpendicular to the axis of rotation of the tyre, the incisions in the intermediate ribs form, on and in the vicinity of the running surface when new of the tread, an angle close to or equal to 0° with a line perpendicular to said surface at the point of intersection, whereas the angle of each of these incisions increases in the depth of the tread.
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