Misalignment during assembly is a common cause of bearing noise,
increased torque, and general poor performance. The free angle
of misalignment that a small bearing can tolerate is typically
less than 1°.
- Locating shoulders on mating components must be parallel
to bearing raceway faces.
- Shaft and housing bores must be concentric. This is particularly
true when more than 2 bearings share a common component.
For example, if a third bearing is added to the above arrangement,
the resulting assembly has almost no tolerance for misalignment
of the bearing outer ring.
The free angle of misalignment (qf)
of a bearing is the maximum angle between the inner race and
outer race axes freely allowed by the bearing. If a bearing
is misaligned such that this angle is exceeded, then damage
and premature failure can occur.