Magnetic fluid bearing apparatus and motor having magnetic fluid

Details Magnetic fluid bearing apparatus and motor having magnetic fluid Magnetic fluid bearing apparatus and motor having magnetic fluid

1990-07-17

1992-04-28

Hannon, Thomas R.

Bearings

Rotary bearing

Plain bearing

277 80, F16C 3382, F16J 1540

Patent

active

051081989

ABSTRACT:
A sliding bearing an an end ring are mounted on a housing. A magnetic fluid sealing member comprises a permanent magnet and a magnetic fluid. A space is formed between the magnetic fluid sealing member and a lubricating fluid. A shaft has projection member or the end ring forms a spiral groove on an inner peripheral portion. The projection member of the shaft or the spiral groove of the end ring is disposed in an opposite position of the magnetic fluid sealing member. A magnetic fluid flow is disturbed by the projection member of the shaft or the spiral groove of the end ring according to a rotation of the shaft, then a magnetic fluid film is destructed instantaneously and the pressure at the space lowers. Air in the space is discharged from the housing. The scatter degree of the magnetic fluid is made slightly.

REFERENCES:
patent: 4526484 (1985-07-01), Stahl et al.
patent: 4598914 (1986-07-01), Furumura et al.
patent: 4630943 (1986-12-01), Stahl et al.
patent: 4673997 (1987-06-01), Gowda et al.
patent: 4694213 (1987-09-01), Gowda et al.
patent: 4938611 (1990-07-01), Nii et al.

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