Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-10-18
1998-10-27
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
384276, 384424, H02K 516, F16C 3302
Patent
active
058281509
ABSTRACT:
A hard disc drive is disclosed, which comprises a compound bearing assembly including a stepped shaft 1 having a large-diameter portion 1a and a small-diameter portion 1b, the large-diameter portion 1a having an inner raceway groove 2a formed in the outer periphery, an outer race ring 3 surrounding the large-diameter portion 1a and having an outer raceway groove 2b, a plurality of balls 4 provided between the inner and outer raceway grooves 2a and 2b, a ball bearing unit 5 having an inner and an outer race ring 5a and 5b and a plurality of balls 6 provided therebetween, the inner race ring 5a being fitted on the small-diameter portion 1b, and a sleeve-like spacer 7 surrounding the stepped shaft 1and having opposite end small-diameter portions, the outer race ring 3 and the outer race ring 5b of the ball bearing unit 5 being fitted on the opposite end small-diameter portions, respectively. The bearing assembly is provided as a complete product and assembled by the hard disc drive manufacturer in the hard disc drive motor by fitting it on a rotor hub thereof.
REFERENCES:
patent: 3826545 (1974-07-01), McKee
patent: 4934843 (1990-06-01), Nakanishi
patent: 5160866 (1992-11-01), Hishida et al.
patent: 5510661 (1996-04-01), Yoshimura et al.
Dougherty Thomas M.
Minebea Kabushiki-Kaisha
Williams Timothy A.
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