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Air Bearings Especially for Magnetic Disk Packs

IP.com Disclosure Number: IPCOM000121066D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Filzek, H: AUTHOR [+2]

Abstract

Magnetic disk packs are currently supported on precision ball bearings. At increasing track densities, however, the vibrations of such bearings are a limiting factor. To remedy this, self-pumping spiral groove bearings with a hydrodynamic lubricating air film may be used. The abrasion occurring when spiral groove bearings are started from standstill is overcome in the bearing described in this article.

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Air Bearings Especially for Magnetic Disk Packs

      Magnetic disk packs are currently supported on precision
ball bearings.  At increasing track densities, however, the
vibrations of such bearings are a limiting factor.  To remedy this,
self-pumping spiral groove bearings with a hydrodynamic lubricating
air film may be used.  The abrasion occurring when spiral groove
bearings are started from standstill is overcome in the bearing
described in this article.

      Fig. 1 is a sectional view of part of a spiral groove bearing,
comprising rotor 1 and stator 2, which revolves around axis 3.  The
profile of spiral grooves 4 (Fig. 2) is shown in the enlarged section
of Fig. 3.

      The hydrodynamic spiral groove bearing with grooves 4 comprises
a hydrostatic standby bearing 5 for the starting phase.  Bearing 5,
which may be made of porous graphite, receives air from a pump, not
shown, through pipe 6 to produce a static pressure.  The hydrodynamic
lubricating air film of the spiral groove bearing builds up at a
speed of about 100 rpm.  After the air film has built up, the pump
supplying air to standby bearing 5 may be used for some other
purpose.  For deceleration, the process is repeated in reverse.