Spindle motor with non-contact seal

Details Spindle motor with non-contact seal Spindle motor with non-contact seal

1988-11-15

1991-02-26

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 9807, 310 90, G11B 1702

Patent

active

049966138

ABSTRACT:
A spindle motor used for example to drive magnetic discs comprises a central shaft and a cylindrical member rotatable relative to the central shaft through a pair of bearings. A small annular clearance is formed between the central shaft and the cylindrical member to communicate with an interior space adjoining one of the bearings. A helical groove is provided at the annular clearance and serves to force any fluid, such as grease vapor, into the interior space.

REFERENCES:
patent: 1843628 (1932-02-01), Poesse
patent: 2479349 (1949-08-01), Hagg
patent: 2633393 (1953-03-01), Bradley
patent: 3004782 (1961-10-01), Meermans
patent: 3702704 (1972-11-01), Bloch
patent: 3975026 (1976-08-01), Boyle
patent: 4209722 (1980-06-01), Peachee
patent: 4519010 (1985-05-01), Elsaesser
patent: 4535373 (1985-08-01), Schuh
G. Niemann--Maschinen-elemente, (1981), pp. 339-343.

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