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Technical data ...
Radial deep groove ball bearings design
The xiros® polymer ball bearings are single-row
grooved ball bearings based on DIN 625. The
lubrication and maintenance-free ball bearings
consist of four components:
Outer race
Inner race
Cage
Balls
Development and tests
Through numerous tests the race materials were
optimised. The polymers we have developed
for use with ball bearings allow higher speeds,
greater loads, and longer service life. But the
development continues, we believe that polymer
ball bearing technology will continue to advance,
especially with our experience and development
with tribological polymer materials. Challenge
us, talk to us about your applications, tell us
what you need from a plastic ball bearing.
In the igus® test laboratory the life and wear
of xiros® polymer ball bearings are tested. In
addition to the actual material comparison, tests
indicate these experiments also answer questions
about the impact of external influences such as
temperature, humidity or dust.
The balls
The ball materials dier most significantly.
In addition to steel glass or plastics are used.
This produces a large dierence in mass, which
in turn aects smoothness, weight and chemical
resistance. Steel balls (stainless steel) are cost-
eective, chemical resistant, but with the highest
weight. Glass balls are used to give a non-metallic
solution. They are also very resistant to chemicals
and have an average weight. The igus® polymer
ball bearings made from PAI have significant
advantages in weight, size and quiet running
characteristics. They can have excellent chemical
resistance.
The cage
The material of the ball bearing cage must fit well
to the application. The various material options
have quite dierent chemical and temperature
resistance values. The cage materials are
compatible with all the different race options
within xiros®.
The outer and inner races
The suitability of a xiros® polymer ball bearings
is largely determined by the materials of the two
races. These are made from igus® Tribo polymers
to maximise service life and minimise friction.
Choice of 5 materials. They allow dierent values
of application temperature, chemical resistance
and price. The table of materials provides exact
information on this topic.
Pillow block and flange bearings
This range is made up by combining xiros®
polymer ball bearing with the igubal® pillow
block and flanged housings, resulting in a higher
flexibility in terms of installation of the bearings.
The pre-finished bearing housing make it easy
for the user to use these maintenance-free
components. Both flanged and pillow block
are available as fixed or as pivoting design.
The difference between the two options is
that the pivoting type can compensate for
shaft and/or bearing misalignment. A spherical
outer race is pressed into the bearing housing,
ensuring self aligning action. If necessary, the
inner bearing can be pivoted in all directions.
Possible misalignment of two bearing points lying
together can thus be compensated.
Other designs
xiros® radial deep groove ball bearings
The other designs include:
●Convex rollers which can run directly on a profile
●Castors
●Multi-bearings for linear and radial movements
●Flange bearings designed e.g. for installation
in tube ends
●Double row bearings for absorbing higher
forces