SLEWING BEARING
Slewing bearing is normally a big of bearing with special structure that may bear integrated load like axle load, radial load and overturning load. It combines support, rotating, tranny, fixed, sealed, anti-corrosion and other functions into one unit. Trusted in lifting machinery, engineering machinery, tranny machinery, mining and metallurgy machinery, medical tools and radar, deliver, wind power and additional industries.
Slewing bearings could be divided into many different types according to their unique structural forms, such as 4 point contact ball slewing bearing ,single row cross roller slewing bearing, double row contact ball slewing bearing, 3 row roller slewing bearing and so on. Each type has different qualities according to its design and structure, rendering it suited to specific applications. For instance Single row four level contact ball slewing bearings are simple in structure, nevertheless they can bear hefty radial load, and will also bear particular axial and 
overturning loads. However, when the device has substantial requirements on the precision and rigidity of the bearing, or the bearing must meet the zero clearance or adverse clearance operating circumstances, the cross cylindrical roller slewing bearing will be the correct choice.
Therefore, when choosing slewing bearings, the following aspects should be considered:
· Precision
When the situation of precision is to select the dominant parameters, we usually choose the cross roller slewing bearing because it has smaller clearance and bigger accuracy.
· Load
The size of load is probably the important factors in identifying the bearing size of slewing bearings. They can be utilized in a wide range of applications where in fact the load size and path may change.
· Operating temperature
Generally, the allowable working temperature of a slewing ring depends mainly on the isolation gasket and the sealing materials used for lubrication. The allowable working temperature ranges from -25 to + 70°C. If slewing bearings are required to operate at extreme temps, please speak to our engineer .
· Vibration
For applications involving vibration, pre-loaded four-point get in touch with ball slewing bearings and cross cylindrical roller slewing bearings are available.
· Turning speed
Four-point contact ball slewing bearings produce much less friction than cross-cylindrical roller slewing bearings, therefore the four-point contact ball slewing bearings also have higher rotational speeds.
· Seals
Sealing is essential to the performance of slewing bearings. Competent seals used in slewing bearings offer good protection against moisture and pollution, and ensure that grease plays a significant function. If slewing bearings function under extreme conditions, such as contact with drinking water, vacuum, corrosive contaminants or radiation, please contact our technical engineers for specific solutions.
Kaydon slewing bearings
Kaydon slewing bearing solutions are perfect for:
Optimal economy in a given envelope dimension
Heavy-duty applications needing significant load-carrying capacity
Designs where precise positioning is critical
The initial requirements of wind generators
Kaydon’s slewing bearings give a wide variety of solutions for the most demanding specs in a variety of applications, including:
Aerospace and defense
Heavy equipment
Industrial machinery
Medical systems
Mining
Oil & gas
Renewable energy
Robotics
Semiconductor manufacturing equipment
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Bearing selector
The Kaydon slewing bearing selector allows you to search our standard slewing bearings by part number or bearing requirements. Outcomes involve load charts and downloadable 3D drawings.