Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2005-03-22
2005-03-22
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S091000
Reexamination Certificate
active
06870289
ABSTRACT:
A bearing having a high thrust rigidity, an excellent vibration resistance, and a simple structure, as well as a spindle motor using such a bearing are provided. A groove or grooves7are disposed to either one of a shaft2and a sleeve3which form a radial bearing portion, to thereby exert thrust force in a direction which brings two mutually facing members at a thrust bearing portion closer to each other. The groove7is inclined with respect to an axis, and the inclination exerts, between the shaft2and the sleeve3, thrust force in a thrust direction. The groove7may be herringbone-shaped or other type of groove which can generates such thrust force. It is also possible to further enhance the thrust force utilizing a negative pressure, with an upstream side of the radial bearing portion for introducing fluid such as air shielded from outside air.
REFERENCES:
patent: 5559382 (1996-09-01), Oku et al.
patent: 6034454 (2000-03-01), Ichiyama
patent: 6121703 (2000-09-01), Kloeppel
patent: 58-92516 (1983-06-01), None
patent: 59-68716 (1984-04-01), None
patent: 11-69715 (1999-03-01), None
Komura Osamu
Murabe Kaoru
Otsuki Makoto
Dougherty Thomas M.
McDermott & Will & Emery
Mohandesi Iraj A.
Sumitomo Electric Industries Ltd.
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