PNEUMATIC TIRE Russian patent published in 2012 - IPC B60C11/04 B60C11/11 B60C11/13 

FIELD: transport.

SUBSTANCE: contact areas constituting tread surface contacting with road surface form circular groove 32 which passes in circumferential direction of tire. In the circular groove 32, flat area 60 and contact area 70 is formed. Flat area 60 of groove represents flat surface of bottom 32a of circular groove 32. Inner contact area 70 protrudes towards tread surface from the bottom 32a of circular groove 32. In the inner contact area 70 group of narrow grooves 80 is formed transversing the tread. Circular groove 32 width in transversal direction of tread is 5-30% of tread surface width in transversal direction of tread.

EFFECT: better traction and breaking properties of tire, as well as better drainage characteristics and preventing slippage on ice- and snow-covered roads.

13 cl, 11 dwg