| 摘要 |
Winter tyre for vehicle wheels, provided with a tread comprising three circumferential grooves (15, 16, 17) and a plurality of transverse grooves (22, 23, 24, 25) which jointly delimit four circumferential rows of blocks, namely two axially outer shoulder rows (20, 21) and two centre rows (18, 19) at the sides of the equatorial plane. The transverse grooves converge on the equatorial plane in the direction of rolling specified for the tyre. In the tread, each transverse groove (22, 23) of the centre rows is made to comprise a widening of the cross section with an essentially circular profile, formed at a distance from the ends, for trapping snow. To obtain quieter running on dry roads, the front transverse edge profiles of the adjacent blocks of the centre rows are made to comprise at least two successive curvilinear portions. These curvilinear portions are shaped in different ways and with opposite curvatures to each other, to form means of attenuating the noise arising from the impact of the tread pattern on dry roads when the tyre is rolling. |
