Browse Prior Art Database

Pivot Bearing Axial Play Gage

IP.com Disclosure Number: IPCOM000123407D
Original Publication Date: 1998-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Prater, W: AUTHOR [+2]

Abstract

Disclosed is a gage designed to measure both actuator pivot bearing axial play, as a screen for bearing looseness, and bearing torque as a screen for raceway brinelling.

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This is the abbreviated version, containing approximately 56% of the total text.

Pivot Bearing Axial Play Gage

   Disclosed is a gage designed to measure both actuator pivot
bearing axial play, as a screen for bearing looseness, and bearing
torque as a screen for raceway brinelling.

   Actuator pivot assemblies are made of two ball bearings
located at the opposite ends of one shaft and one sleeve.  These
components are bonded together by an adhesive and are lightly
preloaded.  The pivot bearing defects that can be measured by this
gage are: 1) looseness caused by missing or uncured adhesive or by a
broken adhesive bond, and 2) high rotational torque spikes caused by
brinelled raceways.  These actuator pivot bearing defects can
adversely effect disk drive servo performance, such as settle time.

   The gage is constructed to easily adapt to 1.0 or 1.6 form
factor pivot bearings, E-block pivot assemblies and head stack
assemblies.  See figures 1 and 2 for front and side views,
respectively.  This flexibility allows the gage to screen components
for damage at: 1) the pivot manufacturer, 2) pivot to E-block
assembly or 3) following swaging of the suspensions onto the E-block.

   The gage has a clamp (1) that presses against either
the pivot sleeve or the E-block assembly body (2) against a
registration flat (3) to hold the part firmly in place.  This leaves
the pivot shaft unstrained, and free to rotate.  A bias force of two
times the pivot preload is applied by a spring plunger (4) to the
pivot shaft to bias the balls against the raceways.  A...