Hydrodynamic bearing device

Details Hydrodynamic bearing device Hydrodynamic bearing device

2009-02-26

2010-06-01

Charles, Marcus (Department: 3656)

Bearings

Rotary bearing

Fluid bearing

C384S107000

Reexamination Certificate

active

07726881

ABSTRACT:
A hydrodynamic bearing device is provided for use with a spindle motor. The hydrodynamic bearing device has a sleeve made of a sintered metal that is obtained by sintering a sintering material that is iron, an iron alloy, copper, a copper alloy or a mixture thereof. This sintered metal has independent pores, which do not communicate with each other, by selecting conditions for forming a desired sintered body within a predetermined range. The conditions includes a grain size of powdered metal of a material for the sintered metal, a molding pressure when the molded body is formed, sintering temperature and sintering period in the sintering step.

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