AIR TIRE Russian patent published in 2011 - IPC B60C11/04 B60C11/11 B60C11/12 B60C11/13 

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Air tire 1 has tread 2 with four main lengthwise grooves 3 with width HG making, at least, 4 mm to divide said tread into central zone 4 with contact with soil, two medium zones 4m of contact with soil and two shoulder zones 4s of contact of soil. Each of zones 4 c, 4m and 4s consists of rows Bc, Bm and Bs of units divided by crosswise grooves 5. Every said unit 6 comprises plates 7. Axial width Wc of central zone 4 of contact with soil varies from 10 to 15% of width TW of tread contact with soil; axial width Wm of central zone 4m of contact with soil varies from 15 to 22% of width of tread contact with soil and axial width Ws of shoulder zone 4s of contact with soil varies from 15 to 22% of width TW of tread contact with soil. Central zone 4m of contact with soil is divided into axially inner parts 4mi and axially outer part 4mo by the grooved in tire lengthwise direction, groove width Hg varying from 2 to 6 mm.

EFFECT: improved contact of tire with icy and snowy road.

6 cl, 5 dwg, 1 tbl