Spindle motor having hydrodynamic pressure bearing

Details Spindle motor having hydrodynamic pressure bearing Spindle motor having hydrodynamic pressure bearing

2007-11-13

2007-11-13

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Fluid bearing

C384S100000

Reexamination Certificate

active

11156795

ABSTRACT:
A spindle motor having a hydrodynamic pressure bearing includes a stator, a rotor, and a dynamic pressure generating unit including a sleeve having an upper plate disposed opposite to the rotor and at least one thrust dynamic pressure groove formed either at the upper plate of the sleeve or at the rotor. Inside width from a neutral radius to an innermost radius of the thrust dynamic pressure groove is larger than outside width from the neutral radius to an outermost radius of the thrust dynamic pressure groove such that the neutral radius is biased to the outside of the thrust dynamic pressure groove. Dynamic pressure at the inside width of the thrust dynamic pressure groove is higher than dynamic pressure at the outside width of the thrust dynamic pressure groove such that fluid supplied into the thrust dynamic pressure groove is guided to the outer diameter side.

REFERENCES:
patent: 5052822 (1991-10-01), Van Beek
patent: 5770906 (1998-06-01), Hazelton et al.
patent: 6017150 (2000-01-01), Lee
patent: 6467963 (2002-10-01), Sakuragi et al.
patent: 6955469 (2005-10-01), Gomyo
patent: 08-084453 (1996-03-01), None
patent: 2001-065552 (2001-03-01), None
patent: 2001-140860 (2001-05-01), None
patent: 2004-44789 (2004-02-01), None
Japanese Patent Office, Office Action mailed Sep. 4, 2007 and English Translation.

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