Patent · US Active

Helical compression spring for an oil scraper ring of a piston in an internal combustion engine and method for coating a helical compression spring

US9004465B2 · kind B2 · utility

1Cited by

10References

10Claims

0Family size

Assignee

Federal-Mogul Burscheid GmbH · DE

Inventors

Marcus Kennedy · Düsseldorf, DE
Han-Rainer Brillert · Burscheid, DE
Michael Zinnabold · Burscheid, DE

Key dates

Filing date	Feb 17, 2011
Grant date	Apr 14, 2015
Priority date	—
Expiry date	Nov 16, 2031

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16J9/26
WIPO fieldSurface technology, coating
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.