Angular Contact Thrust Ball Bearings
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The
angular contact thrust ball bearings shown here were originally designed to
support the rotary tables of drilling rigs but are also suitable for other
applications where high load carrying capacity, high axial stiffness and low
friction torque are important. In contrast to conventional thrust ball
bearings, angular contact thrust bearings can accommodate radial loads in
addition to axial loads and are able to operate at high speeds.
Single direction angular contact ball bearings
These are able to take up axial loads acting in one direction only. They
are of separable type. The washers and ball and cage assembly can be mounted
individually. In the main application, two bearings are adjusted against
each other. The second bearing has to carry the weight of the drill when it
is stationary and has a higher load carrying capacity than the first
bearing.
Double direction angular contact thrust ball bearings
Here the upper bearing has the higher load carrying capacity and the
smaller bearing in the opposite direction is combined with it to form a
unit. These bearings have low height and can accommodate axial loads acting
in both directions as well as moment loads. A single bearing can support
rotating machine components in relation to stationary components.
Dimension
The dimensions of these bearings are by their main application (drilling
rig rotary tables) and have not yet been standardized.
Tolerances
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Misalignment - They cannot tolerate any misalignment of
the shaft with respect to the housing or any angular misalignment.
Cages - They are produced either without cage or are
fitted with machined brass cages centered on the shaft washer or the housing
washer.
Minimum Load - The requisite minimum axial load to be
applied to single direction angular contact thrust ball bearings can be
obtained from
