The application of slewing bearings
A slew ring bearing is a type of rotational bearing that can support heavy and slow-moving or oscillating loads in different directions. It is often used for applications that require a horizontal platform to rotate, such as cranes, wind turbines, satellite dishes, and so on. A slew ring bearing consists of two concentric rings that are connected by rolling or sliding elements, such as balls or plastic liners. The outer ring is usually fixed to a stationary surface, while the inner ring is attached to a rotating object. Some slew ring bearings also have gears on the inner or outer ring to enable different modes of driving the rotation. A slew ring bearing can have various advantages, such as low friction, high load capacity, electrical insulation, and self-lubrication. If you want to learn more about how a slew ring bearing works and what are its component parts, you can click on the links below to view some relevant web pages:
Crane slewing bearings: such as bridge cranes, port cranes, military and civil construction cranes, etc.
Excavator slewing bearings: such as core drilling rigs, crawler excavators, mining hoists, etc.
Construction machinery slewing bearings: such as tower cranes, concrete mixing stations, elevators, etc.
Port machinery slewing bearings: such as container loading and unloading bridges, quayside container cranes, ship unloaders, etc.
Slewing bearings of ship equipment: such as steering gears, marine cranes, etc.
High-precision radar machinery and missile launcher slewing bearings: such as precision tracking radar, missile monitoring radar, aerospace ground station radar measurement and control equipment, attitude control radar, etc.
The slewing ring bearing is a large bearing that can withstand comprehensive loads and can withstand large axial, radial loads and overturning moments at the same time. Slewing support bearings generally have mounting holes, internal gears or external gears, lubricating oil holes and sealing devices, which enable the host to be compact in design, easy to guide and easy to maintain.
There are many forms of slewing bearings, but their structural components are basically the same. There are mainly four basic working methods:
- Point contact rolling type: mainly used for four-point contact ball slewing bearings and crossed roller slewing bearings. This working principle requires high quality of steel balls for combined point contact radial and axial forces, and the track must have a uniform angle.
- Surface contact rolling combined type: mainly used for three-row roller slewing bearings. Its advantages are large contact surface, uniform load-bearing and flexible rolling.
- Surface contact rolling-sliding combination type: Mainly used for turntable bearings. Nowadays, new slewing bearings have compact structure and high precision. Therefore, the surface contact rolling-sliding combination working method is most suitable.
- Rolling-sliding combined rolling type: mainly used for ball-column combined slewing bearings. This principle has small eccentricity and long life, and has the advantages of a dual structure of rollers and balls.