Patent · US Active

Method for producing a piston ring

US11060609B2 · kind B2 · utility

0Cited by

1References

8Claims

0Family size

Assignee

Federal-Mogul Burscheid GmbH · DE

Inventors

Peter Esser · Kürten, DE
Steffen Hoppe · Overath, DE
Klaus Meyer · Kaarst, DE

Key dates

Filing date	Jul 13, 2018
Grant date	Jul 13, 2021
Priority date	—
Expiry date	Sep 11, 2038

Classification

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

Abstract

A piston ring is produced from a main body made of steel or cast steel and comprising a running face, an inner circumferential surface, upper and lower flank regions, and transition regions from the running face to the respective flank region, by coating the running face and the transition regions with a first chromium layer, removing this first chromium layer at the running face down to the base material of the main body, providing at least the running face of the layer-free main body with a nitride layer, and, finally, coating the running face and the transition regions with at least one further chromium layer.

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