Slewing Bearings      

Slewing bearings are large- size bearings, which can carry combined loads: axial, radial load and tilting moment. They are usually equipped with fixing bolt holes, Internal or external gear, lubrication holes and sealing elements, consequently machinery structure can be made compact, guided rotary convenient, mounting and maintenance easy.

Available slewing bearings are: bearings with internal gear, external gear, external gear or non-gear, four-point contact ball bearings, double row angular contact ball bearings, cross cylindrical roller bearings and three row combined cylindrical roller bearings, among which four-point contact ball bearings have the higher static load carrying capacity while cross cylindrical roller bearings have the higher dynamic load carrying capacity. The pre-interference of cross-tapered roller bearings provides higher supporting rigidly and better rotary accuracy. with wider width and different raceways being capable of carrying any direction loads, three row combined cylindrical roller bearings have the same loads therefore compact machinery structure can be obtained. This is a kind of heavy-duty slewing bearings.

The typical applications of the slewing bearings: lift and transport machinery, excavation machinery, building machinery, harbor machinery, cargo lifting machinery on ships, and even high-precision radar antenna mounts and missile launching pads.