Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2005-07-05
2005-07-05
Schuberg, Darren (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C360S099080, C384S112000
Reexamination Certificate
active
06914358
ABSTRACT:
In a spindle motor utilizing dynamic-pressure bearings having a full-fill structure, a bearing configuration that balances and sustains at or above atmospheric pressure the internal pressure of the bearing oil. Thrust and radial bearing sections are configured within oil-filled bearing clearances in between the rotor, the shaft, and a shaft-encompassing hollow bearing member. A communicating passage one end of which opens on, radially inwardly along, the thrust bearing section is formed in the bearing member. Either axial ends of the bearing clearance in between the bearing member and shaft communicate through the passage. The communicating passage enables the oil to redistribute itself within the bearing clearances. Pressure difference between the axial upper and lower ends of the oil retained in between the bearing member and the shaft is compensated through the communicating passage, preventing incidents of negative pressure within the oil and of over-lift on the rotor.
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Nishimura Hideki
Oku Yoshito
Tokunaga Shinya
Uenosono Kaoru
Elkassabgi Heba
Judge James
Nidec Corporation
Schuberg Darren
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