Patent · US Active

Piston ring

US11408508B2 · kind B2 · utility

0Cited by

7References

18Claims

0Family size

Assignee

Federal-Mogul Burscheid GmbH · DE

Inventors

Walter Stumpf · Höchberg, DE
Steffen Hoppe · Overath, DE
Ralf Lammers · Wermelskirchen, DE
Rudolf Linde · Rübhausen, DE

Key dates

Filing date	Nov 28, 2018
Grant date	Aug 9, 2022
Priority date	—
Expiry date	Dec 30, 2038

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02F5/00
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A piston ring (10) has a running surface (12) and a flank surface (14) which are coated. The uppermost layer of the running surface (12) is a hydrogen-containing or a hydrogen-free DLC layer, and the uppermost layer of at least one flank surface (14) is a chromium layer. A method of producing a piston ring (10) includes forming a DLC layer as the uppermost layer of the running surface (12), and forming a chromium layer as the uppermost layer of at least one flank surface (14).

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