FIELD: machine building.
SUBSTANCE: invention relates to the compression piston ring (2) comprising the region (4) of the working surface, the upper surface (6), the lower surface (8) and the inner circumferential surface (10), moreover, the area (4) of the working surface is provided with the profile containing, when viewed over the axial height, the areas of the working surface (4) spaced apart from each other and formed by convex portions (12, 14) containing upper and lower apices So, Su, moreover, between the apices So, Su there is the groove (16) with the depth Tn, with both vertices So; Su in the axial direction are located below the middle M of the piston ring (2).
EFFECT: invention improves the reliability of the piston ring.
10 cl, 6 dwg
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