Hard disk drive device, and fluid dynamic bearing spindle...

Details Hard disk drive device, and fluid dynamic bearing spindle... Hard disk drive device, and fluid dynamic bearing spindle...

2008-04-29

2008-04-29

Klimowicz, William J (Department: 2627)

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

C384S107000, C310S090000

Reexamination Certificate

active

07365940

ABSTRACT:
A hydrodynamic bearing for a hard disk drive device is disclosed. An oil is filled in a clearance between an inner surface of the hub and an outer surface of the shaft, whereby a hydrodynamic radial bearing is formed between the inner periphery of the hub and the outer periphery of the shaft, and a hydrodynamic thrust bearing is formed between the top face of the shaft and the thrust plate. Between an outer peripheral part at the base end of the shaft and an inner peripheral part at the open end of the hub is formed a seal part in which a larger clearance is formed between the shaft and the hub than a clearance in the hydrodynamic radial bearing and in which the oil surface is positioned. An oil surface adjusting hole and a plug for sealing the hole are provided in the case opposite the seal part.

REFERENCES:
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patent: 6246136 (2001-06-01), Ichiyama
patent: 6493181 (2002-12-01), Ichiyama
patent: 7284910 (2007-10-01), Dittmer et al.
patent: 2003/0174915 (2003-09-01), Parsoneault et al.
patent: 2003/0185473 (2003-10-01), Gomyo et al.
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English language Abstract of JP 2003-097546.
English language Abstract of JP 2003-035311.

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