Browse Prior Art Database

Oil-Bearing System for Rotary Actuator

IP.com Disclosure Number: IPCOM000115717D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Nagaraj, HS: AUTHOR [+3]

Abstract

Disclosed is a novel bearing system for the rotary actuator of a DASD. The bearing system proposed here consists of a combination of a sleeve type journal bearing for radial load support and a thrust bearing for axial load support. This bearing system can be a drop in for the conventional ball bearing cartridge. By appropriate material selection this has the potential for eliminating thermal mismatch problems at the point of attachment of the bearing cartridge to the arm-comb. Higher pitch stiffness obtainable with this design leads to improved shock resistance and low tilt TMR. Low profile possibility appears attractive from a packaging viewpoint. Oil film damping will help improve head settle characteristics compared with ball bearing cartridge.

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Oil-Bearing System for Rotary Actuator

      Disclosed is a novel bearing system for the rotary actuator of
a DASD.  The bearing system proposed here consists of a combination
of a sleeve type journal bearing for radial load support and a thrust
bearing for axial load support.  This bearing system can be a drop in
for the conventional ball bearing cartridge.  By appropriate material
selection this has the potential for eliminating thermal mismatch
problems at the point of attachment of the bearing cartridge to the
arm-comb.  Higher pitch stiffness obtainable with this design leads
to improved shock resistance and low tilt TMR.  Low profile
possibility appears attractive from a packaging viewpoint.  Oil film
damping will help improve head settle characteristics compared with
ball bearing cartridge.

      The figure shows how the oil bearing system can be incorporated
into a rotary actuator.  The sleeve and the thrust plate which form
the moving part of the bearing system are bonded together in-place to
maintain proper seating and perpendicularity.  The journal is firmly
attached to the base plate by a screw and/or by bonding.  The top end
of the journal forms one of the surfaces of the thrust bearing and
must be ground square to the OD.  High pitch stiffness can be
obtained by using as large a surface as possible for the thrust
bearing.  The thrust plate can be preloaded to ensure good surface
contact even under upside down operation.  The center portion...