Hydrodynamic bearing arrangement for a spindle motor

Details Hydrodynamic bearing arrangement for a spindle motor Hydrodynamic bearing arrangement for a spindle motor

2005-02-01

2005-02-01

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Fluid bearing

C384S119000

Reexamination Certificate

active

06848829

ABSTRACT:
A hydrodynamic bearing system for use in a spindle motor, especially for the actuation of hard disk drives, wherein the bearing arrangement features a shaft and a sleeve which, supported by a lubricant circulating between their bearing surfaces, are rotatable relative to one another. A reservoir for the lubricant is formed by a recess provided in the shaft and the inner surface of the sleeve. The reservoir is provided in the area of the face of at least one opening in the sleeve. To enable the fill level of the lubricant in the reservoir to be checked, the recess is provided with tapering transitional areas contours of which form an acute angle with the cutting plane of the shaft.

REFERENCES:
patent: 5765952 (1998-06-01), Dekker et al.
patent: 6036369 (2000-03-01), Ichiyama
patent: 6698931 (2004-03-01), Hino
patent: 20030012465 (2003-01-01), Nakamura

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