Dynamic pressure bearing assembly

Details Dynamic pressure bearing assembly Dynamic pressure bearing assembly

1993-07-16

1994-12-13

Footland, Lenard A.

Bearings

Rotary bearing

Plain bearing

384107, 384138, F16C 3374

Patent

active

053724321

ABSTRACT:
A dynamic pressure bearing with a magnetic fluid sealed therein is reduced in size without degrading the bearing performance and includes a sleeve 5 having an insertion hole 6 axially formed therein fixed in a housing 1, and a pair of pole pieces 9a, 9b disposed with clearances defined between the opposed surfaces of the sleeve 5 and the housing 1. A shaft 7 is inserted in and fixed to the pole pieces 9a, 9b, and is disposed in the insertion hole 6 with a clearance defined therebetween, and a magnetic fluid 15 is sealed in these clearances, thus forming a dynamic pressure bearing assembly. The sleeve 5 is made of nonmagnetic material while the housing 1, shaft 7 and pole pieces 9a, 9b are made of magnetic material. A permanent magnet 2 is interposed therebetween to form magnetic fields in the clearances between the housing 1 and the pole pieces 9a, 9b, thus sealing the magnetic fluid 15 therein.

REFERENCES:
patent: 4598914 (1986-07-01), Furumura et al.
patent: 4938611 (1990-07-01), Nu et al.
patent: 5059039 (1991-10-01), Adolfsson
patent: 5161900 (1992-11-01), Bougathou et al.

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