Piston ring for a piston of an internal combustion engine, and a method for producing same

摘要

The invention relates to a method for producing a piston ring (30, 130, 230) for a piston (10) of an internal combustion engine, comprising a ring back (31), an upper ring flank (32), a lower ring flank (33), and a running surface (42), and the method comprising the following method steps: (a) preparing a ring blank (30′) with a ring back (31′), an upper ring flank (32′), a lower ring flank (33′), and an outer lateral face (34′), (b) shaping an asymmetrical convex contour (35) along the outer lateral face (34′) and shaping a radially outward-extending protrusion (36) in the outer lateral surface (34′) in the region of the lower ring flank (33′), (c) coating the outer lateral surface (34′) with a coating material, (d) removing the protrusion (36), thereby exposing the material of the ring blank (30′) in the shape of a circumferential surface (41) which blends into the coating (39), and forming an oil scraper edge (40) between the circumferential surface (41) and the lower ring flank (33′), and (e) post and/or final processing of the coated ring blank (30′) to obtain a finished piston ring (30, 130, 230).

主权项

1. Method for the production of a piston ring (30, 130, 230) for a piston (10) of an internal combustion engine, having a ring back (31), an upper ring side (32), a lower ring side (33), and a working surface (42), comprising the following method steps:
a) making available a ring blank (30′) having a ring back (31′), an upper ring side (32′), a lower ring side (33′), and an outer mantle surface (34′), (b) forming an asymmetrically barrel-shaped contour (35) along the outer mantle surface (34′) and forming a projection (36) in the outer mantle surface (34′), in the region of the lower ring side (33′), which projection extends radially outward, (c) forming a bevel (37), a convex-shaped radius (37′) or a concave-shaped radius (37″) having an axial height of B=0.10-0.30 mm in the region of the outer mantle surface (34′) between the asymmetrically barrel-shaped contour (35) and the upper ring side (32′), (d) coating the outer mantle surface (34′) with a coating material, (e) removing the material of the projection (36), thereby exposing the material of the ring blank (30′) in the form of a circumferential surface (41) that makes a transition into the coating (39), and forming an oil stripping edge (40) between the circumferential surface (41) and the lower ring side (33′), (f) subsequent machining and/or finish-machining of the coated ring blank (30′) to produce a finished piston ring (30, 130, 230).