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Shaft Bearing for Spindle Motor

IP.com Disclosure Number: IPCOM000099724D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Tokumitsu, H: AUTHOR

Abstract

Disclosed is a shaft bearing built into a spindle motor to prevent contaminants from entering. The shaft bearing consists of dual magnetic fluid seals, a shaft with ventilation hole, a couple of bearings, and a sleeve housing.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Shaft Bearing for Spindle Motor

       Disclosed is a shaft bearing built into a spindle motor
to prevent contaminants from entering.  The shaft bearing consists of
dual magnetic fluid seals, a shaft with ventilation hole, a couple of
bearings, and a sleeve housing.

      The shaft bearing is shown in the figure.

      The magnetic fluid seal consists of steel rings 6A and 6B,
magnet rings 7A and 7B, and magnetic fluid 8A and 8B. Magnetic fluid
seals work to prevent bearing lubricant and external particles from
contaminating inner air 11 in enclosures 12A and 12B.

      Shaft 1 is fixed with enclosures 12A and 12B.  Shaft 1 with
holes 2 and 9 works as air ventilation between bearing housing air 4
and external air 10A and 10B.  Ventilation hole 2 is drilled at the
center of bearings 5A and 5B and reaches to penetrating hole 9.  If
ventilation hole 2 were eliminated on shaft 1, magnetic fluid 8A and
8B would break when air pressure in bearing housing 4 changed.

      A couple of bearings 5A and 5B are fixed on shaft 1 and sleeve
housing 3.