Mahle International Gmbh

Richard Alves

Daniel Lopez

The invention relates to a method for producing a piston ring () for a piston () of an internal combustion engine, comprising a ring back (), an upper ring flank (), a lower ring flank (), and a running surface (), and the method comprising the following method steps: (a) preparing a ring blank (') with a ring back (&#x2032;), an upper ring flank (&#x2032;), a lower ring flank (&#x2032;), and an outer lateral face (&#x2032;), (b) shaping an asymmetrical convex contour () along the outer lateral face (&#x2032;) and shaping a radially outward-extending protrusion () in the outer lateral surface (&#x2032;) in the region of the lower ring flank (&#x2032;), (c) coating the outer lateral surface (&#x2032;) with a coating material, (d) removing the protrusion (), thereby exposing the material of the ring blank (&#x2032;) in the shape of a circumferential surface () which blends into the coating (), and forming an oil scraper edge () between the circumferential surface () and the lower ring flank (&#x2032;), and (e) post and/or final processing of the coated ring blank (&#x2032;) to obtain a finished piston ring ().

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Braga, Portugal

Richard Alves