TIRE TREAD CONSISTING OF RIBS THAT ARE INCISED AT VARIABLE ANGLES

摘要

tread for a tyre (1) with the band of rolling with preferential orientation grooves (2) and circumferential ribs (30, 31)32, 33, 35), at least one of the ribs is fitted near each of a plurality of cutting edges are of width of less than 1.5 mm, these cuts led) at the contact face being substantially parallel to each other and having an inclination moyenne.alpha.non zero relative to the direction perpendicular to the surface (s) of the band, the band is characterised in that,in a cutting plane perpendicular to the axis of rotation of the tyre, the incision of a vein,with a perpendicular to the contact surface of the rib at the point of intersection of the cutting face and the angle variable, the thickness of the strip.each incision being inclined to the perpendicular in the point of intersection with the surface in the new condition,.beta.1 angle, angle beta.1 is greater than the angle. alpha., and an angle at the point of incision.beta.2 more within the band, the.beta.2 angle is less than the angle alpha.the point of the cutting the inside regular is relative to the perpendicular.in such a way as to be in front of the point of incision located on the contact face of the rib.