Fluid dynamic bearing unit

Details Fluid dynamic bearing unit Fluid dynamic bearing unit

2005-04-18

2008-10-14

Ridley, Richard W L (Department: 3682)

Bearings

Rotary bearing

Fluid bearing

C384S107000, C384S121000, C384S123000

Reexamination Certificate

active

07435003

ABSTRACT:
A flange on a shaft of a fluid dynamic bearing unit is to be provided with a hole connecting an outer periphery of the flange and an outer periphery of the shaft. A radial groove is provided on a surface of two flange half pieces, and a vertical groove communicating with the radial groove is provided on an inner circumferential surface of the flange half pieces. Upon combining the two flange half pieces with the grooves facing each other and attaching them to the shaft, a path connecting an outer periphery of the flange and an outer periphery of the shaft is formed. The groove may be formed in a desired cross-sectional shape such as a semicircle, triangle or rectangle. The groove may be formed only on either of the flange half pieces, and the groove can be formed by a simple process such as pressing.

REFERENCES:
patent: 6059459 (2000-05-01), Ichiyama
patent: 6066903 (2000-05-01), Ichiyama
patent: 6126320 (2000-10-01), Ichiyama
patent: 6264368 (2001-07-01), Tanaka et al.
patent: 6483215 (2002-11-01), Bodmer et al.
patent: 08-214497 (1996-08-01), None
patent: 10-318253 (1998-12-01), None

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