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The influence of external load on the axial displacement of preloaded NSK bearing set

wallpapers Low Carbon 2020-09-27
For preloaded component bearings, the preload is more susceptible to external loads.
(1) DB type
After assembling the pre-tightening force and load displacement of the DB with different contact angles, under the action of the pre-tightening force, the inner ring end faces of the two NSK bearings will be assembled together.
The influence of external axial load on the axial displacement of the preloaded bearing group. Because the contact angles of the two NSK bearings are different, the force and displacement curves of the two NSK bearings are also very different. Under the same axial load, the deformation of one NSK bearings A is smaller than that of the other NSK bearings B. The maximum external load should not exceed 1.73 times the preload, otherwise bearing B will be unloaded, resulting in premature bearing failure.
(2) TBT type
The influence of external load on the axial displacement of the preloaded bearing group of triple TBT group bearings. Because one end of the bearing is connected in series with two sets of bearings, under the action of external force, the preload and axial force are F0/2 and FaA/2, respectively, while the preload of the bearing is still F0.
(3) QBC and DBT types
For four bearings, the relationship between external load and minimum preload can also be solved by the above method.
 
NSK bearings unloading force comparison
It can be seen from the above calculation that the maximum external load (unloading force) that can be borne in different directions is different for the several assembly methods in the above example. Different contact angle bearing assemblies and the same contact angle bearing assembly have different unloading forces.
Compared with bearing assemblies with the same contact angle, bearing assemblies with different contact angles can increase the bearing capacity of the main load end (end A) without unloading.
 
in conclusion:
(1) NSK angular contact ball bearings can be assembled not only with bearings with the same contact angle, but also with bearings with different contact angles, with various assembly methods.
(2) Compared with combined bearings with the same contact angle, under the same preload and assembly method, using bearings with different contact angles for assembly can increase the load carrying capacity of the main load end.
(3) When using NSK bearings with different contact angles for assembly, the bearing capacity of the non-primary load bearing end of the bearing set is relatively low, and the directionality should be paid attention to during use.

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