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US 9,004,465 B2Granted
Helical compression spring for an oil scraper ring of a piston in an internal combustion engine and method for coating a helical compression spring
AssigneeFederal-Mogul Burscheid GmbH
InventorsMarcus Kennedy, Han-Rainer Brillert, Michael Zinnabold
Life of this patent
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Abstract
A helical compression spring, preferably of steel, in particular CrSi steel or CrNi steel, comprises a coating which has at least one a-C: H: Me coating or a plurality of layers of CrN (16) and a-C: H: Me coatings (14) alternately. In a method for coating a helical compression spring, preferably of steel, a plurality of layers of CrN and a-C: H: Me coatings are applied alternately.
Claims10
A helical compression spring for a piston ring, comprising:
- a substrate made of CrSi or CrNi steel, and
- a coating applied to the substrate which has a plurality of alternating CrN layers and a-C:H:Me layers,
- wherein the number of the CrN and a-C:H:Me layers is from 10 to 200, and the CrN and a-C:H:Me layers each have a thickness of from 30 nm to 100 nm.
Dependencies are inferred from the claim text.