Fluid dynamic-pressure bearing device and spindle motor

Details Fluid dynamic-pressure bearing device and spindle motor Fluid dynamic-pressure bearing device and spindle motor

2007-10-29

2009-08-25

Hannon, Thomas R (Department: 3656)

Bearings

Rotary bearing

Fluid bearing

C384S112000

Reexamination Certificate

active

07578621

ABSTRACT:
A fluid dynamic-pressure bearing includes a rotatable shaft, a hub, a fixed portion, and a lubricating liquid. The hub includes a hub thrust bearing surface extending from the shaft outwardly in a radial direction and an annular surface. The fixed portion includes a fixed-portion upper thrust bearing surface facing the hub thrust surface and a flange surface facing the annular surface. The hub thrust bearing surface, the fixed-portion upper thrust bearing surface, and the lubricating liquid arranged therebetween form together an upper thrust dynamic-pressure bearing. The annular surface and the flange surface define an annular gap therebetween. An axial dimension of the annular gap is larger than a total of an axial dimension of an upper thrust gap between the hub thrust bearing surface and the fixed-portion upper thrust bearing surface and an average depth of upper thrust dynamic-pressure generating grooves of the upper thrust dynamic-pressure bearing.

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