Memory disk driving apparatus

Details Memory disk driving apparatus Memory disk driving apparatus

1996-04-25

1997-07-15

Hannon, Thomas R.

Bearings

Rotary bearing

Fluid bearing

384114, F16C 3206

Patent

active

056476728

ABSTRACT:
A memory disk driving apparatus has a dynamic pressure fluid bearing type spindle motor 1, wherein herringbone grooves 12a are formed on the shaft 12. In the dynamic pressure fluid bearing relatively rotatable with the intermediary of the lubricant injected into a gap between the shaft 12 and the sleeve 13; the shaft diameter D is selected 4 mm or less, and the ratio of the radial gap R between the shaft and the sleeve to the diameter D of the shaft (R/D) is between 0.0005 and 0.002.

REFERENCES:
patent: 5018881 (1991-05-01), Asada
patent: 5141338 (1992-08-01), Asada et al.
patent: 5142173 (1992-08-01), Konno et al.

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