Patent · US Active

Method for hardening running surfaces of roller bearing components

US8479396B2 · kind B2 · utility

3Cited by

3References

8Claims

0Family size

Assignee

Schaeffler Technologies AG & Co. KG · DE

Inventors

Edgar Streit · Poppenlauer, DE
Oskar Beer · Landshut, DE

Key dates

Filing date	May 23, 2007
Grant date	Jul 9, 2013
Priority date	—
Expiry date	Aug 15, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49709
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A method for hardening running surfaces of roller bearing components, in particular outer bearing rings. In order to provide the edge area (functional layer) of the roller bearing components with a deep layer which is particularly hard and resistant to corrosion, the roller bearing component undergoes nitration for a long period of time at a temperature of between 450 and 650° C. for at least 25 hours. During treatment no carburizing and subsequently no quenching takes place.

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