Mud and snow tread profile for a pneumatic tyre

摘要

1. M + S tread surface profile on pneumatic vehicle tyres of a beld and radial carcase type of construction, which profile comprises block profile elements (70 - 73 ; 82, 83 ; 92, 93) wich extend transversely relative to the circumferential direction and are separated from one another by wide circumferential and tranverse grooves (74 - 77), which extend in a continuously open manner, the grooves being provided in two block circumferential lines in the central region of the tread surface and in one respective block circumferential line in the shoulder region of the tread surface and being disposed in inclined transverse lines (Q) and offset relative to one another in a step-like manner, wherein each block profile element is formed from block portions (54, 56), which are offset relative to one another in the circumferential direction, each block profile element having block edges (51, 52, 59 ; 51', 52', 59'), which extend predominantly in the circumferential direction and transversely relative to the circumferential direction, and being provided with fine incisions (48, 49 ; 86 ; 94), wherein the block profile elements have a rhomboid-shaped configuration and each form a supporting surface (50), which surfaces comprise two rectangular outer regions (54, 56) having lateral, nose-shaped projections (57, 58), having longitudinal edges (59, 59'), which lie parallel to the circumferential direction, and having parallel transverse edges (51, 51', 52, 52') which extend transversely relative to the circumferential direction and form the front and rear edges, and which surfaces also comprise an intermediate region (55) having block edges (53, 53') which equally lie parallel to one another, wherein the fine incisions are disposed in such a manner that they extend at least partially into a next adjacent circumferential groove (74, 75), characterized in that one transverse edge (51, 52, 51', 52') of a block profile element is not in alignment with an additional tranverse edge of an additional block profile element of the same or next adjacent tranverse line, in that the intermediate region (55), which connects the outer regions (54, 56, 57, 58) of the block profile element (70 - 73 ; 82, 83 ; 92, 93), is provided with parallel block edges (53, 53' ; 68, 69 ; 78, 79) which are inclined relative to the circumferential direction and slope at an angle of 10 - 45 degrees, in that the inclined block edges (68, 69) of the inner block profile elements (70, 71) of the block circumferential lines of the central region of the tread surface have the same inclination and direction as the inner block profile elements (70, 71), and the inclined block edges (78, 79) of the outer block profile elements (72, 73) of the block circumferential lines in the shoulder regions of the tread surface, when compared with the inner block profile elements, have the same inclination, but the opposite direction of inclination, and in that the supporting surface (50) of the block profile elements is substantially the same size as that of the inner block profile elements (70, 71), but the actual surface of the outer block profile elements (72, 73) disposed in the shoulder regions of the tread surface is substantially 1,5 to 2 times greater than that of the inner block profile elements, the axially outer tranverse surface portion (66, 67) extending into the lateral region of the tyre shoulder.