Patent · US Expired

Piston ring with oxide-nitride composite layer

US6726216B2 · kind B2 · utility

3Cited by

4References

4Claims

0Family size

Assignee

Federal-Mogul Friedberg GmbH · DE

Inventors

Ehrenfried Horn · Dasing, DE
Rudolf Widmann · Purkersdorf, AT
Steffen Hoppe · Overath, DE

Key dates

Filing date	Jun 3, 2002
Grant date	Apr 27, 2004
Priority date	—
Expiry date	Jun 3, 2022

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16J9/26
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A piston ring for use in a cylinder of an internal combustion engine, which ring is nitride-hardened at least on the sliding surface between piston ring and cylinder wall. The nitride layer is composed of a precipitated layer and a compound layer, wherein the piston ring consists of a low-alloyed iron-base material and an oxide layer is deposited on the compound layer.

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