Single row cylindrical roller bearings
The rollers of these bearings are guided between internal
flanges usually present on only one of the bearing rings The
bearing ring with the flanges also carries the roller and
cage assembly, which allows the other ring of the bearing
to be removed and mounted or dismounted separately. The NU
type bearing has two integral flanges on the outer ring and
an inner ring without flanges. The N type has two integral
flanges on the inner ring and an outer ring without flanges.
Other less common variations are also available. This bearing
is capable of carrying very high radial loads and will allow
axial displacement of the shaft within the bearing. They are
therefore suitable for use as non-locating bearings.
Taper roller bearings
Taper roller bearings have tapered inner and outer ring raceways
between which tapered rollers are arranged. The tapered surfaces,
if extended, would converge towards a single point on the
shaft axis. Their design makes them very suitable for carrying
combined radial and axial loads. The axial load carrying capacity
is determined by the contact angle, which corresponds to the
angle of the outer ring raceway. Like the single row angular
contact ball bearing, the taper roller bearing can only carry
loads in one direction. A second bearing must be used in either
back-to-back or face-to-face configuration. Since the roller
ends are in sliding contact with the flange face' good lubrication
is of utmost importance.
Spherical roller bearings
The spherical roller bearing consists of an inner ring with
a double raceway on which two rows of spherical rollers are
attached by the cages. A central guide ring is present separating
the roller ends. The outer ring has a spherical raceway. These
bearings are capable of carrying large axial and radial loads.
They also have the capability to accept misalignment.
The spherical roller bearing is extremely rugged and is used
in applications where heavy and arduous loads are present.
The bearing can be found in two basic configurations; taper
and cylindrical bore. Taper bore allows for easier replacement
of bearings on the shaft and greater control of the residual
clearance in the bearing during fitting.
The CARB?bearing is a unique bearing to SKF and has remarkable
properties. It has a single row sphered raceway and rollers,
which allow for dynamic misalignment and high radial load capacity
while offering great freedom for axial movement within the bearing.
It can be used as the non-locating bearing in arrangements that
require large axial, thermally induced movement in applications
such as the drying cylinders on paper machines and support rollers
on continuous casting machines. This arrangement results in
less vibration and greater stability and a higher product quality
control and accuracy.