Slewing ring bearings are divided into many different types such as four point contact ball slewing bearings, crossed cylindrical roller slewing bearings, double row ball slewing bearings, double row cylindrical roller slewing bearings, triple row roller slewing bearings, wire race slewing bearings, etc. Each type has different characteristics based on its design, which make it suited for a given application.
For example, single row four-point contact ball slewing ring has simple structure, but can take heavy radial loads and a certain axial loads at the same time. So it's very cost effective to choose this type. When accuracy and rigidity are key operational parameters or when zero operational clearance or preload is required, crossed cylindrical roller slewing bearings will be the correct choice.
When accurate positioning is a key operational parameter, crossed roller slewing bearings are typically used.
The magnitude of the load is one of the factors that usually determine the size of the bearing to be used. Generally, four-point contact ball slewing bearings are able to withstand heavy loads and shock loads. They can be adapted for slewing applications where heavy loads vary in magnitude and direction.
3. Permissible operating temperature
Under most circumstances, the permissible operating temperatures for slewing bearings determined primarily by the spacer and seal material and the grease used for lubrication. The permissible operating temperature typically ranges from –25 to +70 °C. If slewing bearings are required to operate outside the reference temperatures, please contact our engineers.
For applications subjected to vibrations, both preloaded four-point contact ball slewing bearings and crossed cylindrical roller slewing bearings are suitable.
5. Operating speed
Four-point contact ball slewing bearings generate less friction than crossed cylindrical roller slewing bearings. Consequently, four point contact ball slewing bearings also have a higher speed capability.
Sealing is vital to the performance of a slewing bearing. Qualified seals used in slewing bearings provide good protection against moisture and contaminants and also provide reliable retention of the lubricant. If bearings are working under extreme conditions where, for example, they are exposed to water, vacuum, high levels of abrasive contaminants, or radiation, please contact us.
Hear is a form of the standard slewing bearing types and their suitability for an application
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