Pivot bearing assembly providing damping for unit-to-unit consis

Details Pivot bearing assembly providing damping for unit-to-unit consis Pivot bearing assembly providing damping for unit-to-unit consis

1997-03-27

1998-03-17

Footland, Lenard A.

Bearings

Rotary bearing

Antifriction bearing

384536, F16C 1910

Patent

active

057278822

ABSTRACT:
A pivot bearing assembly for mounting to an enclosure of a head disk assembly to support a head stack assembly of a disk drive is disclosed. The pivot bearing assembly comprises a shaft for being affixed to the enclosure and defining a longitudinal axis, a first and second set of bearings, the second set of bearings longitudinally spaced from the first set of bearings, and each set of bearings surrounding a respective portion of the shaft. The pivot bearing assembly also comprises an inner sleeve member and an outer sleeve member, both sleeve members surrounding the shaft. A pair of channels is located between the outer and inner sleeve members. Alternatively, the pair of channels is located between the shaft and the sets of bearings. The channels contain a cured cast-in-place material, preferably, an ultra violet cured polyurethane compound having a hardness between approximately 24 Shore A to 79 Shore A. The material provides damping of any vibratory wave propagating between an outer surface of the outer sleeve member and the shaft. Furthermore, a portion of the cured cast-in-place material defines an exterior surface of the pivot bearing assembly.

REFERENCES:
patent: 3730357 (1973-05-01), Beaty, Jr. et al.
patent: 3801171 (1974-04-01), Rozentals
patent: 4594772 (1986-06-01), Bucher
patent: 5029029 (1991-07-01), Hatchett et al.
patent: 5048980 (1991-09-01), Dickinson
patent: 5146122 (1992-09-01), Hearn et al.
patent: 5286118 (1994-02-01), Chi
patent: 5491598 (1996-02-01), Stricklin et al.

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