Hydrodynamic bearing device, spindle motor equipped with...

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

2008-02-01

2010-12-21

Charles, Marcus (Department: 3656)

Bearings

Rotary bearing

Fluid bearing

C384S100000, C384S113000, C384S115000, C310S090000, C360S099080

Reexamination Certificate

active

07854552

ABSTRACT:
A hydrodynamic bearing device comprises a sleeve, a shaft, and a flange cover. The sleeve has a bearing hole and a communicating hole which communicates between both end faces. The shaft is disposed in a state of being capable of relative rotation in the bearing hole of the sleeve, and has a main portion, a flange that is larger in diameter than the main portion, and a communicating hole that communicates with both end faces of the flange. The flange cover is disposed opposing to the lower face of the flange. The pressure loss at the communicating hole is smaller than the pressure loss at the communicating hole.

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