SKF - Rolling Bearings

Factors influencing bearing performance
Design of bearing
arrangements
Shaft and housing fits
Shaft and housing fits can have a significant
influence on the internal clearance and the
operating characteristics of polymer ball bearings.
Therefore, SKF recommends approximately
20 µm interference fit for one ring only.
Depending on the application, the interference
fit can be on the shaft or in the housing. The
other ring should have a loose fit.
Never subject both bearing rings to an
interference fit as it preloads the bearing,
causing it to fail prematurely.
These recommendations are only guidelines
to calculate a fit. Thermal expansion of the
bearing components under operating conditions
must be taken into consideration.
For additional information, contact the SKF
application engineering service.
Factors influencing bearing
performance
In many applications, the performance of polymer
ball bearings is influenced by factors
(temperature, pressure, material tension,
interaction with chemical substances, design
features etc.) that are difficult to replicate in
laboratory tests or to be considered by adjustment
factors. Because of the complexity of
these effects on these bearings, the information
provided in this chapter should be used as
a guideline and cannot substitute for field
testing a selected polymer ball bearing in its
specific application. Therefore, SKF recommends
field testing a selected polymer ball
bearing to make sure that it performs satisfactorily
within the application.
For additional information, contact the SKF
application engineering service.
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