FIELD: machine building.
SUBSTANCE: groove is located between two portions of the working surface in relation to the cross section of the piston ring. Two working surface portion are spaced apart, being substantially spherically convex, and each has the highest point. The groove has a periodically varying depth and periodically changing the width and depth of the course number of periods changes and changes in the number of stroke width the same periods.
EFFECT: invention provides the sufficient lubrication conditions due to a more uniform distribution in the circumferential direction of the lubricating oil supplied in the groove.
12 cl, 11 dwg
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