Conical hybrid FDB motor

Details Conical hybrid FDB motor Conical hybrid FDB motor

2005-09-20

2005-09-20

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S090500

Reexamination Certificate

active

06946764

ABSTRACT:
A disc drive design comprising a shaft and sleeve supported for relative rotation by a journal type fluid dynamic bearing utilizing grooves on one of the shaft or sleeve surfaces. At least a part of the shaft is generally conical in cross-section, so that a downward force component is developed to balance upward pressure on end of shaft; this conical region typically includes a fluid dynamic bearing (grooves being on either the shaft or sleeve). A grooved pattern of a design similar to that usually found on a thrust plate may be defined on an axial end surface of the shaft or the counterplate facing the axial end of the shaft, so that thrust is created to maintain separation of the end of the shaft and the facing counterplate plate during relative rotation. A diamond-like coating (DLC) may be applied to the counterplate surface or to the end of the shaft; further, either the counterplate or shaft may be made out of ceramic material to enhance this performance. This coating may also be applied to the conical surface of the shaft or the facing surface of the sleeve.

REFERENCES:
patent: 5427456 (1995-06-01), Hensel
patent: 5504637 (1996-04-01), Asada et al.
patent: 5561335 (1996-10-01), Dunfield et al.
patent: 5763967 (1998-06-01), Kurosawa et al.
patent: 5977674 (1999-11-01), Leuthold et al.
patent: 6404087 (2002-06-01), Ichiyama
patent: 6456458 (2002-09-01), Ichiyama
patent: 6493181 (2002-12-01), Ichiyama
patent: 06-315242 (1994-08-01), None

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