WINTER TYRE FOR VEHICLE, PARTICULARLY A TRACTION WINTER TYRE FOR HEAVY TRUCKS

摘要

The present invention relates to a winter tyre of a vehicle, the tread (1)whereofbeing provided with tread pattern blocks (11) and with mainly circumferential(a-e)grooves separating said blocks from each other, and with grooves (j-o)transverse tothe circumferential grooves, the rows (A-F) of tread pattern blocks betweensaidcircumferential grooves being displaced relative to each other so that thetreadpattern blocks adjacent in axial direction of the tyre are overlapping, andsaid treadpattern blocks being provided with sipes (8a, 9a) opening to the tread andinto thetyre with the purpose of increasing the grip of the tread with the roadsurface. Thewinter tyre is characterized in that the overlapping and in the axialdirection of thetyre adjacent tread pattern blocks are connected in pairs with each other intodoubletread pattern blocks (2) with a bridge part (3) connecting one end of anadjacent sideedge (4) of one tread pattern block and the opposite end of an adjacent sideedge(5) of another tread pattern block with each other to form a bridge zone andwingparts (6a, 6b) formed from the connected tread elements (2a, 2b) and extendingtherefrom in opposite directions, and in that the length of the bridge part(3), whenviewed in the axial direction of the tyre, is equivalent to the width of thegroove (c)between the connected double tread elements (2a, 2b), that the bridge zone isprovided with a long sipe (7) extending from one circumferential outer edgethereofto the opposite outer edge thereof, and that the long sipe (7) is discontinuedfromthe area (13) surrounding the bore (12) for anti-skid studs, if an anti-skidstud withthe support area is arranged in the area of the long sipe.