Hydrodynamic gas bearing

Details Hydrodynamic gas bearing Hydrodynamic gas bearing

2005-08-23

2005-08-23

Mullins, Burton S. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

06933642

ABSTRACT:
A rotatable hub in which a supporting shaft having hydrodynamic pressure generating grooves is inserted comprises an annular thrust bearing plate in its lower portion and annular permanent magnets in its upper portion. The thrust bearing plate is inserted between the lower end face of the supporting shaft and a thrust flange fixed to the supporting shaft, maintaining the respective clearances D and E.The permanent magnets on the hub are confronting in such a manner that an upward and downward repulsive forces are generated between permanent magnets mounted on the supporting shaft, respectively maintaining the clearances B and C. Since the clearances B and C are greater than the clearances D and E, the permanent magnets will not mutually contact even when the hub is caused to move upward or downward by an external force during rotation and the thrust bearing plate contacts with the lower end face of the supporting shaft or the thrust flange.

REFERENCES:
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patent: 5112141 (1992-05-01), Asada et al.
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patent: 6417590 (2002-07-01), Komura et al.
patent: 6604858 (2003-08-01), Kusaka et al.
patent: 6608415 (2003-08-01), Komura et al.
patent: 6678115 (2004-01-01), Khan

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