Spindle motors with hard coated hydrodynamic bearings

Details Spindle motors with hard coated hydrodynamic bearings Spindle motors with hard coated hydrodynamic bearings

1996-04-02

1998-02-17

Hannon, Thomas R.

Bearings

Rotary bearing

Fluid bearing

384100, 384107, 384625, F16C 3206

Patent

active

057185166

ABSTRACT:
A spindle motor having hydrodynamic bearings formed between a hardcoated shaft with a radial thrust bearing plate substantially perpendicular to the axis of the shaft, a hard coated sleeve, and a hardcoated thrust ring. An axial bearing cavity is formed between the sleeve and the shaft. A first radial bearing cavity is formed between a radial surface of the sleeve and a lower radial plate surface. A second radial bearing cavity is formed between a lower surface of the thrust ring and an upper radial plate surface. Lubricant at least partially fills the cavities to form hydrodynamic bearings therein. The surface hard coats are preferably ceramic-like coatings such as titanium nitride, boron carbide, or Laser Cut 964. A method for fabricating a motor having hydrodynamic bearings includes the steps of machining motor components from a metal such as steel or bronze, coating the components with a surface hard coat, and assembling the motor.

REFERENCES:
patent: 4445793 (1984-05-01), Shinohara
patent: 4726693 (1988-02-01), Anderson
patent: 4795275 (1989-01-01), Titcomb et al.
patent: 4838710 (1989-06-01), Ohta et al.
patent: 5067528 (1991-11-01), Titcomb et al.
patent: 5112142 (1992-05-01), Titcomb et al.
patent: 5366298 (1994-11-01), Toshimitsu et al.
U.S. Patent Application Serial No. 08/485,373, Improvements In Fluid Bearings For Electronic Spindle Motors, applicants Charles J. Cheever et al., filed Jun. 7, 1995.
U.S. Patent Application Serial No. 08/591,735, Filling Technique for Hydrodynamic Bearings, applicant Charles J. Cheever, filed Jan. 25, 1996.

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