Misalignment by using self-aligning spherical roller bearing units

Misalignment

Self-alignment in a traditional bearing versus an Extreme Bearing mounted with self-aligning spherical roller bearing

self-aligning spherical roller flange bearing

The traditional bearing unit portrayed in the drawing contains ball-bearing inserts fitted with a spherical outer ring (marked in red). The idea is that the bearing is self-aligning. However, this is not always the case. What usually happens is that the force (F) holds the outer ring of the insert firmly in the housing, making it difficult or even impossible for the insert to adjust itself. If the bearings are subject to excessive axial loading, the forces generated penetrate through the bearing, causing damage to the balls, inner ring, ball race and even the housing. Ultimately, the insert has to be replaced, while the bearing housing is also damaged permanently in many cases.
An Extreme Bearing does not use an insert with a spherical outer ring, but instead has a flat outer ring with a concave raceway. The concave raceway in combination with the spherical rollers operate over a wide range of contact angles thus the rollers align themselves correctly with the shaft and assembly without causing undue stress on the rest of the bearing assembly.

What is misalingement? nice good information you can find on : Power-mi.com 

self-aligning spherical roller bearing

an extreme bearing can handle an alignment error of up to 3 degrees but this depends on which seal is chosen.

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