The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 2015
Filed:
Dec. 21, 2011
Daniel Lopez, Stuttgart, DE;
Richard Alves, Braga, PT;
Daniel Lopez, Stuttgart, DE;
Richard Alves, Braga, PT;
MAHLE International GmbH, Stuttgart, DE;
Abstract
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 (′), an upper ring flank (′), a lower ring flank (′), and an outer lateral face (′), (b) shaping an asymmetrical convex contour () along the outer lateral face (′) and shaping a radially outward-extending protrusion () in the outer lateral surface (′) in the region of the lower ring flank (′), (c) coating the outer lateral surface (′) with a coating material, (d) removing the protrusion (), thereby exposing the material of the ring blank (′) 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 (′), and (e) post and/or final processing of the coated ring blank (′) to obtain a finished piston ring ().