Browse Prior Art Database

Three-Point Bearing Attachment Method

IP.com Disclosure Number: IPCOM000111401D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 4 page(s) / 76K

Publishing Venue

IBM

Related People

Goeke, D: AUTHOR [+2]

Abstract

A method to attach a bearing cartridge to an actuator body which will allow the expansion of dissimilar metals without inducing excessive stress in the actuator and provide a rigid structural connection between the actuator and bearing cartridge is disclosed. A method to generate the features required by this attachment method is also disclosed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Three-Point Bearing Attachment Method

      A method to attach a bearing cartridge to an actuator body
which will allow the expansion of dissimilar metals without inducing
excessive stress in the actuator and provide a rigid structural
connection between the actuator and bearing cartridge is disclosed.
A method to generate the features required by this attachment method
is also disclosed.

      A historical problem with disk enclosures has been a method to
attach a steel bearing assembly to a light-weight (usually aluminum
or magnesium) actuator assembly to provide a rigid mechanical
structure and avoid the distortion and misregistration caused by
dissimilar thermal expansion rates of the two metals as the assembly
is subjected to temperature changes.

      This article describes a bearing attachment method which
provides three lines of contact between the bearing and the bore
spaced to provide a large wheel base to maximize stiffness and a
method to generate these lines of contact in the actuator bore.  The
lines of contact between the bore and the bearing sleeve are created
by cutting a set of reliefs in the actuator bore, as shown in Fig. 1.

      For example, with a 12 mm diameter actuator bore, the reliefs
in the bore can be generated as shown in Fig. 2.  A 5.25 mm cutter
centered on Datum B is used first to to cut the entire depth of the
bore.  This operation creates the lines of contact with the bearing
sleeve in one operation to achieve the hig...