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Single row four point contact ball bearings are routinely used as slew ring bearings under a combination of axial and radial loads and moment. Features such as gear teeth and mounting holes can also be integrated into these bearings, so specific hardness levels and hardening depths are often required on the induction hardened raceways. It is also important to evaluate the static safety factor and the dynamic life. However, there is currently no published description of the theoretical load calculations for this type bearing. Therefore, the static and dynamic axial equivalent loads for these bearings are calculated.

Slew ring bearings takes axial and radial loads and moment simultaneously and are used in rotating mechanisms such as excavators and cranes for earthmoving equipment. For these applications, a cross roller bearings can be used and feature more stiffness than the ball type bearings. In this paper the static and dynamic equivalent loads are calculated for the cross roller type slew ring bearings such as cylindrical roller and tapered roller bearings. As a result, simple formulae were obtained to calculate the safety factors and bearing lives for the cross roller slew ring bearings under simultaneous eccentric axial load and radial load.