What Are the Factors That Need to Be Considered in the Selection of Slewing Bearings?

Slewing ring bearings are divided into many different types, such as four-point contact ball slewing ring, crossed roller slewing ring, double-row ball slewing bearing, double-row cylindrical roller slewing ring, three row roller slewing bearing, wire raceway slewing bearings etc. Each type has different characteristics based on its design to meet the requirements of different applications. So, what are the factors that need to be considered in the selection of slewing bearings?

Ⅰ. Factors to be considered in the selection of slewing bearing

1. Rotation accuracy

Crossed roller slewing bearings are usually selected when the ability to accurately position the bearing is required.

2. Carrying capacity

Bearing capacity is one of the factors that determine the size of the bearing. Generally, the four-point contact ball slewing bearing can withstand heavier radial loads and shock loads, so it is suitable for situations where heavier loads and the magnitude and direction of the loads may change.

3. Working temperature

In most cases, the allowable operating temperature of a slewing bearing is mainly determined by grease, spacers and sealing materials. In general, the allowable operating temperature range for slewing bearings is -25 to +70°C.

4. Vibration

For applications involving vibration, preloaded four point contact ball slewing bearing rings and crossed cylindrical roller slewing rings are suitable.

5. Running speed

The friction force generated by the four-point contact ball slewing ring is smaller than that of the crossed cylindrical roller slewing ring, and it has a higher limit speed.

6. Seal

Sealing is critical to the performance of the slewing ring. Qualified seals used in slewing bearings provide good protection against moisture and contamination, and ensure adequate grease levels in the bearing, thereby extending the service life of the bearing.

Ⅱ. The purchase of slewing bearing precautions

1. If the slewing bearing is installed on a supporting surface that lacks integrity, the local deformation will change the load, causing the bearing to have different load sizes. If proper measures are not taken, it is easy to cause the failure of the slewing bearing.

2. Whether the screw is strong enough. Make sure to choose the professional slewing ring bearing manufacturers and slewing bearing products suitable for your installation. This stage is often overlooked, leading to the possibility of system failure. So this issue still needs special attention.

3. Are the bolt holes uniform, as the fasteners need to be placed in more places than the load area. Bolt holes should only be used as a hazardous support structure in areas where loads are present and should not be ignored in the overall design of the product. A uniform bolt ring helps reduce bending and load distribution in bearings, fasteners and support structures.

The above article summarizes in detail the factors that need to be considered in the selection of slewing bearings. There are six common factors, but various other factors will be encountered in actual production and use. SWBTEC is a slewing ring bearing manufacturer, specializing in R&D and manufacturing of turntable bearings, slewing bearings, slewing ring bearings, if you have any questions, you can call us!