Patent · US Active

Piston ring

US8857820B2 · kind B2 · utility

2Cited by

3References

10Claims

0Family size

Assignee

Federal-Mogul Burscheid GmbH · DE

Inventors

Christian Herbst-Dederichs · Bornheim, DE
Peter Esser · Kürten, DE
Ralf Lammers · Wermelskirchen, DE
Sebastian Bresinski · Langenfeld, DE

Key dates

Filing date	Oct 14, 2010
Grant date	Oct 14, 2014
Priority date	—
Expiry date	Oct 29, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49281
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A piston ring, in particular a compression piston ring, includes a running surface, upper and lower flank areas, an inner peripheral area and a joint. The wall thickness of the piston ring is uniform over its periphery and at least the running surface is provided with a PVD coating or a CVD layer in such a manner that the running surface layer has a lesser layer thickness in the peripheral area close to the joint than in the remaining peripheral area of the running surface.

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