Tsakos Energy Navigation Limited
PISTON RING WITH INLAID DLC COATING AND METHOD OF MANUFACTURING

Abstract:

A piston ring providing improved performance during operation, including reduction in blowby gases and improved oil control, is provided. The piston ring includes a rail disposed in a recess of a wire. The wire presents a wire outer diameter surface, the ring presents a ring outer diameter surface, and a coating including diamond-like carbon is disposed on the rail outer diameter surface. The coating is inlaid and thus an exposed sharp upper corner is present between an upper portion of the wire outer diameter surface and an upper ring surface, and an exposed sharp lower corner is present between a lower portion of the wire outer diameter surface and a lower ring surface.