PNEUMATIC TIRE Russian patent published in 2013 - IPC B60C11/04 B60C11/11 B60C11/13 

FIELD: transport.

SUBSTANCE: invention relates to tread pattern design for all-season motor tire. Tread surface (2) of pneumatic tire is provided with at least one main longitudinal groove (3) in outer area at outer side of vehicle. Longitudinal main groove (3) is straightline groove so that edge lines (21), where groove wall planes (20) intersect with tread surface (2) go rectilinearly in longitudinal direction. Each surface (20) of groove wall consists of upper part (20U) of wall surface and lower part (20L) of wall surface. Upper part (20U) of wall surface is slightly sloping and passes from edge line (21) at the θ1 angle of 40° to 60° relative to line perpendicular to tread surface (2). The lower part (20L) of wall surface is steeply sloping and passes up to bottom surface (22) at θ2 angle that is less than 91 angle. Each lower part (20L) of wall surface contains protrusions (23) located in longitudinal direction of tire. Each protrusion (23) has triangle cross-section with sloping surface (23 S) passing from lower end (Ue) of upper part (20U) of wall surface to bottom (22) of groove at θ3 angle which does not exceed angle 91 but is greater than angle 92.

EFFECT: better running characteristics on snow, increased traction power on snow-covered road surface while maintaining high-level coupling on dry road surface.

7 cl, 11 dwg, 1 tbl