Needle Roller/Angular Contact Ball BearingsIn addition to radial forces, needle roller/angular contact ball bearings can support axial forces in one or both directions. Needle roller/angular contact ball bearings capable of supporting axial loads in one direction act as semi-locating bearings, while bearings capable of supporting axial loads in both directions act as semi-locating or locating bearings.
Needle roller/angular contact ball bearings comprise a radial needle roller bearing, an angular contact ball bearing as the axial component and an inner ring. In the case of type NKIA the inner ring is of a single-piece design, whereas type NKIB has one narrow and one wide inner ring. The ball cage of the axial bearing component is made from plastic. The bearings have a low radial section height and are suitable for high speeds. As needle roller/angular contact ball bearings are not self-retaining, the inner ring can be mounted independently of the outer ring and the needle roller and ball set.
In order to support axial forces, the axial bearing component must be preloaded to 1% of the basic static axial load rating. Skewing between the shaft and housing is not possible.
If the bearing design capable of supporting axial loads in one direction is to support axial forces from alternating directions, two bearings must be adjusted against each other.