A slewing ring is a large diameter antifriction bearing made from quenched and tempered steel including one, two or three raceways of balls or rollers to carry axial & radial forces and moment loads at the same time. Bolt holes in the inner and the outer ring provide for an easy installation. Internal or external gears can be attached; the teeth are directly cut into either the inner or outer bearing ring. The raceways are induction hardened. Seals are attached on both sides to prevent the lubricant from escaping.
SLEW RING OR SLEW DRIVE?
Since slew drives include the full drive train, are fully enclosed and lubricated for low maintenance they are very popular in applications that require an easy & quick installation, safe operation even in harsh environments, or high load capacity and high torque in the smallest envelope. Typical examples include man lifts, drill rigs, steering gears, and fun rides.
Slewing rings are preferred for larger diameters as the housing would get too heavy and costly. Slewing rings are used for example in large cranes, tunnel boring machines, multi-MW wind turbines, and bottle filling lines.
Our Slew Rings are designed to handle simultaneously occurring axial, radial and moment loads, and can be combined with pinions, planetary gearboxes, and motors. IMO USA slewing rings are also equipped with a sealed raceway system and an open gearing (if toothed).
We offer standard designs including internal gearing, external gearing, no gearing, flange rings, roller/ball combo, ball, double axial, cross roller and roller along with custom offerings. In addition, surface coatings, helical or straight gearing, heat-treated gearing, special materials, and special seals are available.
Please contact us if you would like our engineering team to specify the most efficient slewing ring for your application.