Patent ID: 6761197
Filing Date: 2004-07-13
Classification: B60C,Y02T,Y10S

Abstract:
A tyre for vehicles, comprising:a carcass structure including a central peripheral portion and two sidewalls terminating in a pair of beads for fixing a wheel to a rim; a belt structure coaxially associated with the carcass structure; and a tread with a predetermined thickness between a radially external surface of the tread and a radially internal surface of the tread in contact with the belt structure, the tread extending coaxially around the belt structure and comprising a row of central blocks and a row of intermediate blocks arranged on each side of an equatorial plane of the tyre between a central longitudinal groove formed astride the equatorial plane and a pair of longitudinal lateral grooves, the blocks of the central and intermediate rows being circumferentially spaced respectively by a plurality of first and second transverse grooves extending in a direction substantially perpendicular to a predetermined direction of forward travel of the tyre, each block being formed by a pair of transverse sides, respectively a front side and a rear side, relative to the direction of forward travel, and by a pair of longitudinal sides, the blocks of the central rows being separated from the blocks of the intermediate rows by a pair of longitudinal sipes, wherein: the blocks of the intermediate rows are circumferentially staggered by a first predetermined quantity relative to the blocks of the central rows; the blocks of the central rows arranged on a first side of the equatorial plane of the tyre are circumferentially staggered by a second predetermined quantity relative to the blocks of the central rows on a second side of the equatorial plane of the tyre; the first and second transverse grooves have centre lines converging in the direction of forward travel with ends on planes parallel to the equatorial plane of the tyre; the first and second transverse grooves have centre lines inclined in opposite directions to one another at a first angle with respect to a plane perpendicular to the equatorial plane of the tyre; and a depth of the first and second transverse grooves is equal to at least 95% of the thickness of the tread along the entire length of the first and second transverse grooves.