Spindle motor and disk drive utilizing the spindle motor

Details Spindle motor and disk drive utilizing the spindle motor Spindle motor and disk drive utilizing the spindle motor

2005-05-03

2005-05-03

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C369S269000, C360S099080, C384S107000, C384S119000, C384S132000

Reexamination Certificate

active

06888278

ABSTRACT:
Low-profile spindle motor whose entire shaft length is utilized to configure, along an encompassing sleeve, a radial dynamic-pressure bearing section. One end of the shaft is unitary with the rotor, and a cover member closes the other end. Between the sleeve upper-end face and the rotor undersurface a thrust bearing section is configured. Micro-gaps are formed continuing between the sleeve upper-end face and the rotor undersurface; the sleeve inner-circumferential surface and the shaft outer-circumferential surface; and the cover member inner face and the shaft end face, where an axial support section is established. Oil continuously fills the micro-gaps, configuring a full-fill hydrodynamic bearing structure. Hydrodynamic pressure-generating grooves in the radial bearing section are configured either so that no axial flow, or so that a unidirectional flow that recirculates from one to the other axial end of the radial bearing section through a communicating pathway is induced in the oil.

REFERENCES:
patent: 6702466 (2004-03-01), Ishikawa et al.
patent: 6712513 (2004-03-01), Tanaka et al.
patent: 6717310 (2004-04-01), Yoshikawa et al.

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