| 摘要 |
FIELD: transportation. ^ SUBSTANCE: it is opened tyre-tread surface with one prescribed direction of rotation, including the first main straight groove, passing on tire circumference in area located from 4% till 15% of tire contact junction with ground width from tire equatorial plane to the left and the right sides. Tractive grooves pass slantwise from first main straight grooves to external sides of tire in the line opposite to tire sense of rotation in a way that they intercommunicate with edges of tire contact junction with ground, at that tractive grooves are located with specified distances on tire circumference. Tractive grooves and first main straight grooves form units. Between first main straight grooves with specified distances on tire circumference are located V-shaped transversal grooves, at that transversal grooves have tops, turned in the line opposite to tire sense of rotation. Transversal grooves first main straight grooves form units. Each transversal groove is of groove width measured by tire circumference, located in the range from 0.1L till 0.25L relative to length of L unit by tire circumference, adjoining to transversal groove. Ratio ACA/GCA of area ACA contact junction of units with ground and area GCA contact junction of total tyre-tread surface is from 55% till 75%. ^ EFFECT: improving of braking on wet surface and tire grip on snow and ice. ^ 9 cl, 1 dwg, 3 tbl, 3 ex |
