Fluid dynamic bearing motor, and recording-medium driving...

Details Fluid dynamic bearing motor, and recording-medium driving... Fluid dynamic bearing motor, and recording-medium driving...

2005-06-02

2010-06-15

Charles, Marcus (Department: 3656)

Bearings

Rotary bearing

Fluid bearing

C384S107000, C384S123000, C384S120000

Reexamination Certificate

active

07736061

ABSTRACT:
A fluid dynamic bearing has pressure-generating grooves provided in opposed thrust surfaces of a thrust bearing portion opposite a circular plate and a stopper to direct a working fluid from inner and outer peripheral edges of the thrust bearing portion toward a radially intermediate portion thereof as a shaft member rotates relative to a support. One or more through-holes are provided between inner edges of annular regions of the thrust surfaces in which the pressure-generating grooves are provided and the intermediate portion in the radial direction. The through-holes extend through the thrust bearing portion and interconnect pressure-generating grooves in the opposed thrust surfaces so that bubbles in the working fluid can be sucked smoothly into the through-holes through the pressure-generating grooves.

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