Patent ID: 6095216
Filing Date: 2000-08-01
Classification: B60C,Y10S

Abstract:
A tire for motor-vehicles provided with a grooved tread band having a multi-purpose composite pattern, wherein said pattern comprises:a central straight channel (2), defined by two continuous ribs to have two continuous edges, extending circumferentially at a centered position with respect to the equatorial plane (""X"") of the tire, wherein each of the edges of the central channel extend straight,said central channel (2) having a width (""l"") of between 3 to 5% of overall width (""L"") of the grooved composite tread pattern (1);two series of circumferentially-distributed transverse grooves (3) disposed at laterally-opposite positions relative to the central channel (2) and having a substantially inclined extension, symmetrically converging towards the circumferential channel itself,at least two circumferential grooves (4) symmetrically spaced apart from the central channel (2) and delimiting, together with the transverse grooves (3), two rows of center blocks (5) extending at symmetrically side-by-side positions relative to the central channel (2), and two rows of shoulder blocks (6) extending adjacent to opposite side edges (7) of the grooved composite tread pattern;each of said circumferential grooves (4) being defined by a sequence of parallel portions (4a), oriented obliquely to the circumferential direction of the grooved composite tread pattern (1), in order to give the groove itself a broken-line course, and each portion delimiting the mutually opposite circumferential edges of a center block (5) and a shoulder block (6), so that each of said center (5) and shoulder (6) blocks has a corner (5a, 6a) projecting inwardly of the circumferential groove (4) with respect to the opposite corner (5b, 6b) of the circumferentially adjacent block (2), said oblique portions (4a ) of the two circumferential grooves (4) converging towards the central channel (2) in a concordant direction with the converging direction of said transverse grooves (3),wherein said shoulder blocks have first lamellae cuts (10) comprising first transverse lamellae cuts (10a, 10b) inclined, relative to an axial direction of the tire, in the opposite direction to the transverse grooves (3) wherein said first lamellae cuts (10) each consist of two transverse lamellae cuts (10a, 10b) circumferentially staggered relative to each other and interconnected by a straight lamelliform connecting cut (10c) extending in a circumferential direction across only one of said transverse grooves.