Hydrodynamic bearing device and motor

Details Hydrodynamic bearing device and motor Hydrodynamic bearing device and motor

2007-10-23

2007-10-23

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Fluid bearing

C384S107000, C384S913000

Reexamination Certificate

active

11217318

ABSTRACT:
An object of the present invention to provide a hydrodynamic bearing device and a motor having a high performance and reliability which prevents deterioration in a temperature property due to a difference in coefficients of linear expansion of a sleeve and a shaft and prevents abrasion of bearing surfaces of both the sleeve and the shaft. The sleeve is formed of a copper metal material or an iron metal material and is treated with electroless nickel plating at least on the surface which opposes the shaft. The shaft includes 0.2% by weight C, 0.3% by weight Si, 8% by weight Mn, 0.2% by weight S, 2.5% by weight Ni, and 14% by weight Cr, and a main component of the shaft is a manganese alloy steel including Fe.

REFERENCES:
patent: 6341896 (2002-01-01), Miura et al.
patent: 2004/0090701 (2004-05-01), Byun et al.
patent: 2004/0101217 (2004-05-01), Kinoshita et al.
patent: 2005/0169561 (2005-08-01), Asada et al.
patent: 10-89345 (1998-04-01), None
patent: 3052540 (2000-06-01), None
patent: 2000-297813 (2000-10-01), None
patent: 2004-166497 (2004-06-01), None

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