Bearings – Rotary bearing – Fluid bearing
Patent
1988-07-20
1989-04-18
Footland, Lenard A.
Bearings
Rotary bearing
Fluid bearing
384119, 384144, 384471, F16C 3372
Patent
active
048221821
ABSTRACT:
A rotary motion driving apparatus includes a gas bearing assembly for supporting a rotatable shaft and is usable in any ambience such as a vacuum ambience. The rotatable shaft has two flange-like collar portions formed on the opposite ends of the rotatable shaft. The collars are used as the members to be supported by the gas bearing assembly with respect to the thrust direction. A driving motor has a rotor and a stator, the rotor being fixed to one of the collars of the rotatable shaft and the stator being fixed to the gas bearing assembly. The other collar of the rotatable shaft functions as an output end of the rotary drive produced by the motor. Around such drive outputting collar of the rotatable shaft, a sealing plate having a plurality of grooves or recesses is provided. The sealing plate is maintained out of contact with the collar, and suitable vacuum is supplied to the grooves of the sealing plate. A casing is fixed to the sealing plate to thereby define a predetermined space within which the gas bearing assembly and the driving motor are accommodated. With this arrangement, the driving apparatus can function as a source for supplying a rotary drive with high rotational precision, even when the apparatus is used in a vacuum ambience.
REFERENCES:
patent: 2950150 (1960-08-01), Ashworth
patent: 3450448 (1969-06-01), Weichsel
patent: 3828610 (1974-08-01), Swearingen
patent: 4402514 (1983-09-01), Ryan et al.
patent: 4448460 (1984-05-01), Yamamoto
patent: 4652149 (1987-03-01), Nakaoka et al.
patent: 4749283 (1988-06-01), Yokomatsu et al.
Matsushita Koichi
Suzuki Hiroyuki
Canon Kabushiki Kaisha
Footland Lenard A.
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