Page 82 - Rollingbearings

B.2 Bearing type and arrangement
Misalignment Table 1
Types of misalignment
An overview is provided in Suitability of roll-
ing bearings for industrial applications,
page 72, of the capability of various bearing
types to accommodate misalignment The Static There is an initial alignment error
different types of misalignment are explained misalignment between the two supports of a shaft
in table 1
Bearing types vary in their ability to com­
pensate for misalignment between the shaft
and housing: Shaft delection creates misalign­
ment between bearing inner and
outer rings that is constant in mag­
• Self-aligning bearings (ig. 20) nitude and direction
Self­aligning bearings can compensate for
misalignment within the bearing Values
for the permissible misalignment are listed
in the relevant product section Dynamic Varying shaft delection creates
misalignment misalignment between bearing
inner and outer rings that is contin­
• Alignment bearings (ig. 21) uously changing in magnitude or
Alignment bearings can accommodate direction
initial static misalignment because of their
sphered outside surface Values for the
permissible misalignment are listed in the
relevant product section Fig. 20
Bearing type and arrangement angular contact ball bearings, cylindrical, Self-aligning bearings
• Rigid bearings
Rigid bearings (deep groove ball bearings,

needle and tapered roller bearings)
accommodate misalignment within the
limits of their internal clearance Values for
the permissible misalignment are listed in
the relevant product section For rigid

service life

B.2 bearings, any misalignment may reduce
Temperature

The permissible operating temperature of
Self­aligning ball Spherical roller CARB toroidal Spherical roller
rolling bearings can be limited by: bearing bearing roller bearing thrust bearing
• the dimensional stability of the bearing
rings and rolling elements (table 2, for
details refer to the relevant product
section)
• the cage (Cages, page 187)
• the seals (relevant product section)
• the lubricant (Lubrication, page 110)

80