PISTON RING Russian patent published in 2020 - IPC F16J9/14 F16J9/20 F16J9/26 

FIELD: machine building.

SUBSTANCE: present invention relates to a piston ring of a piston internal combustion engine. Piston ring of piston internal combustion engine includes ring body with open lock, radial outer side of working surface, radial inner circumferential side, and also two opposite in axial direction end sides; at least partial coating (B) on side of working surface; and circumferential groove (A) in lower area of working surface, which ends beyond area (C) of lock. Side of working surface has convex profile with rotary point located at height h₂, making 60–70 % of axial height h of piston ring, and located in upper half of piston ring. Recess (A) on side of working surface has size equal to 20–40 % of axial height h of piston ring, and defines lower area of working surface and piston ring.

EFFECT: invention is aimed at improvement of efficiency of oil removal and reduction of wear.

6 cl, 7 dwg