Slewing bearing

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Slewing bearings are large size bearings which can carry higher axial, radial loads and overturning moments at the same time. Slewing bearings generally have mounting holes, internal or external gears, lubricant holes and sealing equipment.

There are various structures of slewing ring bearings, such as four point contact ball slewing bearing, double row angular contact ball slewing bearings, crossed cylindrical roller slewing bearings, crossed tapered roller bearings and three row cylindrical roller slewing bearings, with gears or no gears. Four point contact ball slewing bearings possess high static loading capacity; crossed cylindrical roller slewing bearings can carry high dynamic loads; crossed tapered roller slewing bearings have high stiffness and rotation accuracy by preloading.

Slew ring bearings are widely used in cranes, excavation machines, construction machinery, port cargo handling machinery, large turnplates of high precision radars and missile launchers, etc.

Types of Slewing Bearings

There are several types of slewing bearings, each suited for different uses:

Type	Description	Best For
Single-row four-point contact ball bearing	Has one row of steel balls that touch the raceway at four points. Supports axial, radial, and tilting loads. Compact and light.	Small to medium machines like small cranes and excavators.
Double-row ball bearing	Two rows of balls, can handle bigger loads and moments. Larger and stronger than single-row.	Medium to large cranes and heavy-duty equipment.
Crossed roller bearing	Rollers arranged at right angles, very precise and compact. Handles axial, radial, and moment loads.	Construction machinery, military equipment.
Triple-row roller bearing	Three rows of rollers, very strong with the highest load capacity. Larger and heavier.	Huge machines like bucket wheel excavators, marine cranes.
Gear types	Some slewing bearings have internal or external gear teeth to help drive rotation directly.	Machines that need powered rotation like cranes and wind turbines.