Browse Prior Art Database

Spindle Motor

IP.com Disclosure Number: IPCOM000122470D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Tokumitsu, H: AUTHOR

Abstract

Disclosed is a spindle motor for a hard disk dive where a labyrinth seal is formed between a top cover and a hub of the spindle motor or between the top cover and a clamp ring. The purpose is to protect from the scattering of grease mist from ball bearing to disk surface.

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

Spindle Motor

      Disclosed is a spindle motor for a hard disk dive where a
labyrinth seal is formed between a top cover and a hub of the spindle
motor or between the top cover and a clamp ring. The purpose is to
protect from the scattering of grease mist from ball bearing to disk
surface.

      The technique will be best understood with reference to the
figure which shows a cross section of the spindle motor in the hard
disk drive.

      A ball bearing 1 has grease. When a spindle motor is rotating,
the bearing 1 scatters grease mist between a top cover 2 and a hub 3.

      The following is the technique for preventing the grease mist
from being scattered from the bearing 1 to a disk 12.

      First, the top cover 2 has circular protuberances 7 and 8 with
a centering hole 6.

      Second, the hub 3 has a circular groove 10 which maintains
concentricity with a shaft 5 to make a narrow clearance between the
protuberance 7 and the groove 10.

      Third, a clamp ring 4 has a circular groove 11 which maintains
concentricity with the shaft 5 to make a narrow clearance between
protuberance 8 and the groove 11.

      Finally, a screw 9 fixes the top cover 2 and the shaft 5 at
the centering hole 6 to keep radial and axial clearance between the
protuberances 7 and 8 and the circular grooves 10 and 11,
respectively.