Slew ring bearings take axial and radial loads and moment simultaneously and are used in rotating mechanisms such as excavators, cranes and turntables for earthmoving and construction equipment and mining and handling machinery. For these applications, a four-point contact ball bearing is typically used, but cylindrical and tapered roller bearings can also 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 static and dynamic equivalent loads, as well as safety factors and bearing lives for the cross roller slew ring bearings under simultaneous eccentric axial load and radial load.
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