Hydrodynamic bearing device, and spindle motor equipped with...

Details Hydrodynamic bearing device, and spindle motor equipped with... Hydrodynamic bearing device, and spindle motor equipped with...

2008-07-24

2011-10-11

Hannon, Thomas R (Department: 3656)

Bearings

Rotary bearing

Fluid bearing

C384S107000

Reexamination Certificate

active

08033732

ABSTRACT:
In a hydrodynamic bearing device with which the lubricant is prevented from leaking to the outside, and good seal performance can be maintained, and in a spindle motor equipped with this hydrodynamic bearing device, the hydrodynamic bearing device includes a shaft, a sleeve, a lubricant that fills a microscopic gap, a radial bearing portion, a thrust bearing portion, and a bearing seal portion. The value of a function P1/V1, where V1is a fluctuation volume of the sleeve in the axial direction and P1is a capillary pressure index at a vapor-liquid interface located near the opened end of the bearing seal portion, is at least a specific value.

REFERENCES:
patent: 6836388 (2004-12-01), Nishimura et al.
patent: 2007/0140605 (2007-06-01), Asada et al.
patent: 2007/0183698 (2007-08-01), Hada
patent: 2007/0201779 (2007-08-01), Kim
patent: 2007/0230840 (2007-10-01), Asada et al.
patent: 2007/0253650 (2007-11-01), Asada et al.
patent: 2002-54628 (2002-02-01), None
patent: 2003-158861 (2003-05-01), None

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