Hydrodynamic bearing, spindle motor and hard disk drive

Details Hydrodynamic bearing, spindle motor and hard disk drive Hydrodynamic bearing, spindle motor and hard disk drive

2005-09-27

2005-09-27

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Fluid bearing

C384S107000, C384S114000

Reexamination Certificate

active

06948852

ABSTRACT:
A hydrodynamic bearing having a shaft (10) and a bearing sleeve (12), which encloses the shaft with a slight radial clearance forming a concentric bearing gap. An equalizing volume cavity (20) is formed at at least one end of the bearing. At least one micro-passage (26) connects the bearing gap via appropriate openings with the equalizing volume cavity (20). Bearing fluid completely fills the bearing gap (24) and the micro-passage (26) and at least partially fills the equalizing volume cavity (20). The bearing fluid forms a continuous fluid film between the bearing gap (24) and the equalizing volume cavity (20).

REFERENCES:
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patent: 5540504 (1996-07-01), Cordova et al.
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patent: 5667309 (1997-09-01), Nose
patent: 5876124 (1999-03-01), Zang et al.
patent: 6236129 (2001-05-01), Yamashita
patent: 0 117 873 (1983-09-01), None
patent: 2001012458 (2001-01-01), None
patent: WO 00/52350 (2000-09-01), None
patent: WO 02/10602 (2002-02-01), None

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