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Browse Prior Art Database

Fitting Bearings to Dissimilar Materials

IP.com Disclosure Number: IPCOM000102399D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Davison, J: AUTHOR [+3]

Abstract

Methods are disclosed that overcome the problem of accommodating differential expansion between a bearing outer race and a surrounding housing, thus preventing loosening and vibration of the outer race.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 60% of the total text.

Fitting Bearings to Dissimilar Materials

       Methods are disclosed that overcome the problem of
accommodating differential expansion between a bearing outer race and
a surrounding housing, thus preventing loosening and vibration of the
outer race.

      Disk files commonly use push fits or adhesives to retain the
bearings of actuators and spindles.  Vibration occurs if eccentricity
exists or develops in either shaft or bearing housing, which may
arise from mechanical imperfections in press fitting, or failure of
the adhesive. When the materials used for bearing and housing have
different thermal coefficients of expansion, temperature changes can
cause bond breaking and thus vibration.  Two techniques described use
a compliant layer to take up thermal expansion differences and to
damp out any vibration. The thickness of the compliant layer (in both
methods) is calculated from the differences in thermal coefficients
of expansion of the various materials involved, i.e., bearing,
compliant layer, adhesive and housing.   Shafts fixed into an inner
race of a bearing can be similarly bonded.  The methods also reduce
noise and vibration arising from imperfections in the ball bearing,
and by absorbing peak stresses, extend its life.

      As illustrated in Fig. 1, the outer surface of a bearing 1 is
attached to the inner surface 5 of a housing 2 by means of a
compliant layer 4 and a containing ring 3. Containing ring 3 is a
material with a thermal expansion ch...