PNEUMATIC TIRE Russian patent published in 2018 - IPC B60C11/16 

FIELD: automotive engineering.

SUBSTANCE: stud (anti-skid stud) comprises a buried base portion embedded in the tread portion of the pneumatic tire, and an apical portion projecting from the road surface of the tread after insertion of the buried base portion into the tread portion. The upper surface of the apical portion comprises: a first projecting portion and a second projecting portion, the length of which is larger in the transverse direction of the tire than in the tire circumferential direction projecting to one side in the tire circumferential direction; a first recessed portion located between the first and second projecting portions and recessed to the other side in circumferential direction of the tire; a third projecting portion and a fourth projecting portion projecting towards the other side in a circumferential direction of the tire; and the second recessed portion located between the third and fourth projecting portions and recessed to one side in the circumferential direction of the tire.

EFFECT: improvement tire tread adhesion to icy road due to edge effect of the apical sections of the stud.

10 cl, 12 dwg, 3 tbl