Free Combination Pairing of Angular Contact Ball Bearings
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Arbitrary paired bearings are specially manufactured so that when they are arranged arbitrarily and installed closely together, a certain internal clearance or preload and/or uniform load distribution can be obtained without using gaskets or similar devices. Any paired bearing has a model suffix, indicating internal clearance (CA, CB, CC) or preload (GA, GB, GC).
When ordering, it is necessary to specify the number of individual bearings required, not the number of bearing groups.
When the load capacity of single-row bearings is insufficient, paired installation (series configuration) or paired installation (back-to-back and face-to-face matching) is used when the load is compound or the axial load acts in two directions.
In series configuration, the load lines are parallel, and the radial and axial loads are evenly shared by the bearings. However, the bearing group can only bear the axial load acting in one direction. If the axial load acts in the opposite direction, or if there is a composite load, a third bearing with relative series pair adjustment must be added.
The load line of the back-to-back bearing is separated from the bearing shaft. Axial loads acting in both directions can be sustained, but the loads in each direction can only be borne by one bearing. Back-to-back mounted bearings provide relatively rigid bearing configurations and can withstand overturning moments.
The load of face-to-face matched bearings converges linearly to the bearing shaft. Axial loads acting in both directions can be sustained, but the loads in each direction can only be borne by one bearing. This configuration is not as rigid as back-to-back pairing and is not suitable for overturning moment.
The bearings with general matching and single bearing also have advantages when used together. Most bearings are SKF Explorer series, so they have higher accuracy, higher load-carrying capacity and higher speed.
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