Patent · US Expired

Rolling bearing in aircraft

US7213973B2 · kind B2 · utility

0Cited by

1References

8Claims

0Family size

Assignee

FAG Kugelfischer AG · DE

Inventors

Gerhard Kreiselmeier · Dittelbrunn, DE
Wilhelm Sebald · Bad Königshofen im Grabfeld, DE
Franz-Josef Ebert · Hammelburg, DE

Key dates

Filing date	Oct 29, 2003
Grant date	May 8, 2007
Priority date	—
Expiry date	Apr 8, 2024

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC21D2221/10
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A single-row or multi-row rolling bearing comprising thin-walled bearing races which are made of a martensitic, through hardened steel and have the following characteristics: a surface hardness of ≧613 HV (56 HRC) in the area of the bearing face; a core hardness of ≧285 HV (28 HRC); a difference of ≧150 HV (9 HRc) between the surface hardness and the core hardness. The core hardness is reached at a depth ranging between 8 percent of the diameter of the rolling elements and 90 percent of the wall thickness on the bottom of the track. There is a ratio of ≧20 between the diameter of a pitch circle Tk and the diameter of a rolling element DW.

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