TIRE TREAD CONSISTING OF RIBS THAT ARE INCISED AT VARIABLE ANGLES

摘要

tread for pneumatic tyre (1) with a direction of rollingthis band is preferential(2) comprising grooves in circumferential directionthe ribs (30), and31, 32, 33, 35), at least one of the ribs is fitted around each of itsedges of aa plurality of grooves of width less than 1.5 mm, and the incisions.on the contact facebeing substantially parallel to each other and having an inclinationmoyenne.alpha. not anywherein the direction perpendicular to the surface (s) of theband, this band ischaracterized in that, in a cutting plane perpendicular to the axis ofrotation of thetyre, each incision of a vein, with aperpendicular to the face ofcontact of the rib at the point of intersection of the incision withthe front inclinationvariations in the thickness of the tape, each incision being inclinedreport to theperpendicular, in its point of intersection with the road surface atthe new one.beta.1 angle, the angle being greater than the.beta.1 angle. alpha., and athe angle of the incision, the.beta.2 atthe inside of the band, the angle is less than the.beta.2 angle. alpha.,the point of this incision atwithin the band is located relative to the perpendicular.in such a way as to be in frontfrom the point of the incision located on the contact face of the rib.