Bearings – Rotary bearing – Fluid bearing
Patent
1987-09-29
1989-06-13
Hannon, Thomas R.
Bearings
Rotary bearing
Fluid bearing
384107, 384279, 384625, 384902, F16C 3206, F16C 3302
Patent
active
048387100
ABSTRACT:
A static pressure gas bearing assemby having a gaseous fluid discharging bearing member for supporting a shaft by the discharged gaseous fluid is disclosed. The bearing member is made of porous graphite. For the manufacture, carbon particles approximately 80% of which have particle diameters not greater than approx. 40 microns, more particularly, particle diameters ranging from 1-20 microns are used. The carbon particles are subjected to molding, calcination and graphitization, whereby a porous graphite member having pores distributed substantially uniformly is obtained. In another aspect of the invention, the bearing member is made of a porous graphite material having a specific degree of swelling. Also, in another aspect, the surface of the shaft to be supported by the bearing member is coated with titanium nitride by ion plating treatment. In this manner, a high-precision and high-prerformance bearing assembly can be provided with reduced manufacturing costs.
REFERENCES:
patent: 2645534 (1953-07-01), Becker
patent: 2855249 (1958-10-01), Gerard
patent: 3349462 (1967-10-01), Mott
patent: 3352612 (1967-11-01), Eudier
patent: 3645590 (1972-02-01), Bird et al.
patent: 4013326 (1977-03-01), King
patent: 4522453 (1985-06-01), Lammer et al.
Maruyama Yutaka
Matsushita Koichi
Ohta Jiro
Tozawa Sadamu
Canon Kabushiki Kaisha
Hannon Thomas R.
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