Page 80 - Rollingbearings

B.2 Bearing type and arrangement
Loads ISO deines bearings with contact angles
≤ 45° as radial bearings, and the others
When selecting bearing type based on load as thrust bearings, independent of their
criteria, you should bear in mind that: actual use.
To accommodate combined loads with a
• Roller bearings accommodate heavier light axial component, bearings with a small
loads than same­sized ball bearings contact angle can be used. Deep groove ball
• Full complement bearings accommodate bearings are a common choice for light to
heavier loads than the corresponding moderate axial loads. With increasing axial
bearing with a cage load, a larger deep groove ball bearing (with
higher axial load carrying capacity) can be
An overview is provided in Suitability of roll- used. For even higher axial load, bearings
ing bearings for industrial applications, with a larger contact angle may be required,
page 72, the radial, axial and moment load such as angular contact ball bearings or
capability of various bearing types tapered roller bearings. These bearing types
can be arranged in tandem to accommodate
high axial loads.
Combined radial and axial When combined loads have a large alter-
loads nating axial load component, suitable solu-
tions include:
The direction of load is a primary factor in
bearing type selection Where the load on a • a pair of universally matchable angular
bearing is a combination of radial and axial contact ball bearings
load, the ratio of the components deter­ • matched sets of tapered roller bearings
Bearing type and arrangement direction of load corresponds to its contact used to accommodate the axial component
mines the direction of the combined load
• double-row tapered roller bearings
(ig. 19)
Where a four -point contact ball bearing is
The suitability of a bearing for a certain
angle α (diagram 1) – the greater the contact
of a combined load (ig. 2, page 70), the
angle, the higher the axial load carrying
bearing outer ring must be mounted radially
capacity of the bearing You can see this indi­
free and should not be clamped axially.
Otherwise, the bearing may be subjected to
cated in the value of the calculation factor Y
unintended radial load.
(refer to individual product sections), which

B.2 decreases as the contact angle increases Fig. 19
Direction of load

Combined load Pure radial load Pure axial load
The resulting load direction is Load direction 0° Load direction 90°
determined by the ratio of radial
to axial load. Example: NU design cylindrical Example: Thrust ball bearing
roller bearing (accommodates (accommodates axial load only)
Example: Deep groove ball radial load only)
bearing

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