FIELD: machine building.
SUBSTANCE: invention relates to a piston ring for an internal combustion engine or compressor, in particular to a piston ring comprising outer working surface (3), two side surfaces (5, 6) and inner circumferential surface (7), working surface (3) contains a profiled element in the form of groove (2), with groove (2) in the cross section of piston ring (1) located between the upper portion (3'a) of working surface and lower section (3''a) of working surface along a wavy path. Amplitude and/or wavelength of the wave-like path of groove (2) varies in the circumferential direction.
EFFECT: invention provides for the distribution of lubricating oil around the circumference of the piston ring.
16 cl, 11 dwg
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