PISTON RING WITH A PERIODICALLY VARYING GROOVE

摘要

The invention relates to a piston ring with an outer running surface, two flanks and an inner circumferential surface. Said running surface has a profile with a groove. The groove is arranged between two running surface sections with respect to the cross-section of the piston ring. The two running surface sections are arranged at a distance from each other, are essentially convexly spherical and have respectively an apex. The groove has a periodically varying depth and a periodically varying width. The number of periods of variations of the depth and the number of periods of variations of the width are equal.