Slewing bearings can be divided into many different types according to their different structural forms, such as four point contact ball slewing bearing ,single row cross roller slewing bearing, double row contact ball slewing bearing, three row roller slewing bearing and so on. Each type has different characteristics according to its design and structure, making it suitable for specific applications. For example Single row four point contact ball slewing bearings are simple in structure, but they can bear heavy radial load, and can also bear certain axial and overturning loads. However, when the mechanism has high requirements on the precision and rigidity of the bearing, or the bearing needs to meet the zero clearance or negative clearance operating conditions, the cross cylindrical roller slewing bearing will be the correct choice.
Therefore, when selecting slewing bearings, the following aspects should be considered:
When the problem of precision is to select the dominant parameters, we usually choose the cross roller slewing bearing because it has smaller clearance and higher accuracy.
The size of load is one of the important factors in determining the bearing size of slewing bearings. They can be used in a wide range of applications where the load size and direction may change.
In most cases, the allowable operating temperature of a slewing ring depends primarily on the isolation gasket and the sealing material used for lubrication. The allowable operating temperature ranges from -25 to + 70°C. If slewing bearings are required to operate at extreme temperatures, please contact our engineer .
For applications involving vibration, pre-loaded four-point contact ball slewing bearings and cross cylindrical roller slewing bearings are available.
Four-point contact ball slewing bearings produce less friction than cross-cylindrical roller slewing bearings, so the four-point contact ball slewing bearings also have higher rotational speeds.
Sealing is crucial to the performance of slewing bearings. Qualified seals used in slewing bearings provide good protection against moisture and pollution, and ensure that grease plays an important role. If slewing bearings work under extreme conditions, such as exposure to water, vacuum, corrosive contaminants or radiation, please contact our technical engineers for specific solutions.