Arrangement of rolling bearings
There are various arrangements of rolling bearings that can be selected depending on the requirements of the application and the loads. Here are some of the most common arrangements:
O arrangement or back-to-back arrangement. Suffix for a bearing set with 2 bearings DB (NSK and SKF)
In this arrangement, the inner or outer rings of the bearings are aligned parallel to each other. Both manufacturers mean the same thing when, for example, NSK describes that the load contact point is far apart and SKF describes that the contact lines diverge in the direction of the bearing axis. It is easy to imagine an O, even if the lines are drawn further apart. The arrangement is suitable for applications with moment loads, high axial loads and low radial loads. Axial forces can be absorbed in both directions. The bearing arrangement is often used because it is relatively rigid and can nevertheless absorb smaller tilting moments. The design must take into account that the axial load is only absorbed by one bearing or bearing group.
X arrangement or called face to face. Suffix for a bearing set with 2 bearings DF (NSK and SKF)
In contrast to the O arrangement, the distance between the load application points is small or, in other words, the contact lines converge in the direction of the bearing axis. Therefore, in contrast to the O arrangement, only low torques can be absorbed, but the X arrangement can compensate for smaller shaft deflections. The X arrangement can also absorb axial forces in both directions, but again only from one bearing or bearing group.
Tandem arrangement. Suffix for a bearing set with 2 bearings DT (NSK and SKF)
In this arrangement, two bearings are arranged in series in the same way to enable increased axial load support. It is suitable for applications with high axial loads and moderate radial loads. However, the bearing set can only support axial loads acting on one side. The load is the same on all bearings and can be increased by adding further bearings. If an axial load is also required from the other side, additional bearings must be added against the tandem arrangement.
The selection of the correct bearing arrangement depends on various factors, including the type of load, the operating conditions and the performance requirements of the application.
Pairs of layers in universal design
In order to accommodate additional loads, angular contact ball bearings can be paired to form bearing sets. Bearings of the universal design with the same inner ring and outer ring tolerances are used for this purpose. It is important to observe the manufacturer's instructions for fitting and pairing bearings.
All information is provided without guarantee and is for general information purposes only.
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