Bearings – Rotary bearing – Fluid bearing
Patent
1986-06-12
1988-01-05
Werner, David
Bearings
Rotary bearing
Fluid bearing
384133, 277 80, 310 905, F16C 3204, F16J 1540
Patent
active
047172665
ABSTRACT:
A low friction bearing arrangement includes first and second poles of magnetically permeable material which define first and second pole surfaces which are spaced apart. The first and second poles also define first and second side surfaces, respectively, which are aligned. A quantity of ferrofluid, positioned intermediate the first and second pole surfaces and adjacent the first and second side surfaces, is held by means of a fringing magnetic flux between the first and second side surfaces at a level which extends beyond the side surfaces. A rotatable shaft of nonmagnetic material is supported on the quantity of ferrofluid and is held out of contact with the side surfaces thereby, such that the shaft may be freely rotated.
REFERENCES:
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patent: 3834775 (1974-09-01), Tuffias et al.
patent: 3917538 (1975-11-01), Rosensweig
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patent: 4060288 (1977-11-01), Arsenius et al.
patent: 4357024 (1982-11-01), Raj
patent: 4526379 (1985-07-01), Raj
patent: 4630943 (1986-12-01), Stahl et al.
Catalog of Standard and Replacement Ferrofluidic Feedthroughs, Ferrofluidics Corp., 40 Simon St., Nashua, NH 03061 (undated).
Hart, Jr. Edward E.
Patten Joseph G.
Spectra-Physics Inc.
Werner David
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