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Slew ring bearings are routinely used to take heavy loads under a combination of eccentric axial load and radial load for off-highway vehicles applications such as excavators and cranes. The type and size of the bearing are determined based on a safety factor and rolling life calculated using a comparison with static & dynamic equivalent loads vs. dynamic load ratings. In this paper, the static and dynamic equivalent loads are calculated for three roller type slew ring bearings. As a result, a manual calculation method was obtained to determine the static and dynamic equivalent loads, as well as safety factors and rating lives for each row of the three roller type slew ring raceways under simultaneous eccentric axial load and radial load.

Single row four point contact ball bearings are routinely used as slewring bearings to take heavy loads under a combination of eccentric axial load and radial load for applications such as earth moving equipment, construction machinery, mining and handling machines, excavators and cranes, etc. The calculation method of the equivalent loads for slewring bearings was introduced in SAE 2006-01-35541 ) , but only dealt with the case in which the bearing takes a tilting moment due to combination load. In this paper, two additional load case conditions are analyzed: one is the case in which the bearing takes all ball loads only on one side of each raceway axially, and the second is the case in which the bearing takes ball loads radially on both sides of each raceway.