PNEUMATIC TYRE Russian patent published in 2016 - IPC B60C11/12 B60C11/11 

FIELD: motor industry.

SUBSTANCE: invention relates to tire tread design intended for movement over ice and snow. Tyre (1) is made with multiple circular main grooves (21, 22) passing in direction along tire circumference and multiple contact sections (31, 32), separated by circular main grooves (21, 22). Contact areas (31, 32) are made with multiple auxiliary sipes (52). When viewing tread auxiliary sipes (52) have curved shape, formed by connection of first bent sections (521) and second curved sections (522). Depth (Dg) of grooves, which have circular main grooves (21, 22), and depth (Ds_1) slot-like drain grooves, which have first curved sections (521), and depth (Ds_2) slot-like drain grooves, which have the second curved sections (522) auxiliary Sipes (52), have ratio of 0.5≤s_1/Dg≤1.0 and 0.2≤Ds_2/Ds_1≤0.5.

EFFECT: improved braking performance of tyre on ice and improving driving stability on snow when moving.

21 cl, 19 dwg, 1 tbl