Title:
DIRT-RESISTANT ROLLING ELEMENTS FOR ANTI-FRICTION BEARINGS
Document Type and Number:
WIPO Patent Application WO2003098059
Kind Code:
A3
Abstract:
The invention relates to rolling elements for anti-friction bearings consisting of martensitic, fully hardenable steel. According to the invention, the internal pressure stresses at a radial depth of 4 % of the rolling element diameter lie between minus 400MPa and minus 1200 MPa and the hardness or hardness gradient of the finished rolling element has the following characteristics: a) a surface hardness of >=613HV (56 HRc); b) a core hardness of >=285HV (28 HRc); c) a differential (A) between the surface hardness and core hardness >= 150HV (9 HRc); d) the core hardness is achieved at a radial depth of between 8 % and 30 % of the rolling element diameter. This permits a particularly long service life under conditions of mixed friction and dirt retention in the anti-friction bearing.
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Inventors:
EBERT FRANZ-JOSEF (DE)
STREIT EDGAR (DE)
STREIT EDGAR (DE)
Application Number:
PCT/DE2003/001550
Publication Date:
February 12, 2004
Filing Date:
May 14, 2003
Export Citation:
Assignee:
FAG KUGELFISCHER AG & CO KG (DE)
EBERT FRANZ-JOSEF (DE)
STREIT EDGAR (DE)
EBERT FRANZ-JOSEF (DE)
STREIT EDGAR (DE)
International Classes:
F16C33/32; F16C33/34; (IPC1-7): F16C33/32; F16C33/34
Foreign References:
| US3117041A | 1964-01-07 | |||
| US3682519A | 1972-08-08 | |||
| US4659241A | 1987-04-21 | |||
| EP1167791A2 | 2002-01-02 | |||
| US6478893B1 | 2002-11-12 |
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