Rolling element bearing for ultra-low viscosity fluids

Details Rolling element bearing for ultra-low viscosity fluids Rolling element bearing for ultra-low viscosity fluids

2006-08-15

2006-08-15

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Antifriction bearing

C384S450000

Reexamination Certificate

active

07090404

ABSTRACT:
A rolling element having comprises an inner ring, an outer ring and a series of rolling elements which are in contact with the raceways of the rings, an ultra-low viscosity fluid being present in the contacts having a kinematic viscosity ν=(ηo/ρ) of less than 2 mm2/s, wherein the surfaces of the rings and the rolling elements have asperities which can have solid-to-solid contact during operation of the bearing. A factor <i>Dq</i> is defined which is equal to (I) whereby the solid-to-solid contact of the asperities is reduced by selecting such design parameters and operating conditions of the bearing that <i>Dq</i> is in the range from 8.0×10−6mrad s1/2to 1.36×10−4mrad s1/2.

REFERENCES:
patent: 3695391 (1972-10-01), Munnich et al.
patent: 5469713 (1995-11-01), Wardle et al.
patent: 6176092 (2001-01-01), Vandeleest et al.
Patent Abstracts of Japan, vol. 017, No. 151 (M-1387), Mar. 25, 1993 & JP 04 321816 A (NTN Corp), Nov. 11, 1992, abstract.

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