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Turntable bearing common sense
**Home > Bearing Knowledge > Slewing Bearing Common Sense**
Slewing bearings, also known as turntable bearings, are large bearings designed to support heavy loads. They can handle axial, radial, and overturning moments simultaneously. These bearings typically feature through holes, internal or external gears, lubrication ports, and sealing systems, which help in creating a compact design and simplifying the installation and maintenance of the host equipment.
Slewing bearings come in various types, including four-point contact ball bearings, double-row angular contact ball bearings, insert roller bearings, and three-row cylindrical roller bearings. Each type is suited for different applications based on load capacity, precision, and operational requirements.
Four-point contact ball bearings are ideal for high static load conditions, while insert roller bearings offer high dynamic load capacity. The pre-interference in sub-bearings ensures greater rigidity and accuracy in rotation. Three-row cylindrical roller bearings are particularly effective in handling heavy loads, allowing each row to manage specific forces independently, thus reducing the overall diameter of the bearing.
These bearings are widely used in large-scale machinery such as construction equipment, port cranes, ship systems, radar installations, missile launchers, and precision instruments. Custom designs can be developed based on specific user requirements, making them versatile for unique applications.
Three-row roller slewing bearings consist of three separate raceways, enabling them to handle multiple loads efficiently. They are commonly used in heavy-duty machines like bucket wheel excavators, mobile cranes, and large-tonnage truck cranes.
Double-row angular contact ball bearings have three raceways, with steel balls arranged in upper and lower tracks. This allows for efficient load distribution and is suitable for medium to large-sized cranes and tower cranes.
Single-row insert roller bearings are compact, lightweight, and precise, making them ideal for lifting and transport equipment, construction machinery, and military applications.
The manufacturing process includes forging, machining, heat treatment, grinding, and final inspection, ensuring high quality and performance. Common materials used include 50Mn, 42CrMo, GCr15SiMn, and 9Cr18Mo.
Slewing bearings are available in different precision grades: P0 (standard), P6, P5, P4, and P2 (high-precision). The higher the precision, the more expensive the bearing.
Applications of slewing bearings include:
1. **Trailer Systems**: Used in transport vehicles, agricultural trailers, and airport equipment. They primarily transfer axial loads.
2. **Wind Power**: Bearings are used in yaw and pitch systems of wind turbines, providing smooth rotation and stability.
3. **Solar Energy**: Rotating solar panels benefit from compact and reliable slewing bearings.
4. **Medical Equipment**: High-precision bearings are used in devices like CT scanners, MRI machines, and gamma knives.
5. **Robotics**: Slewing bearings enable precise and rigid rotational movement in robotic joints.
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This article is sourced from China Bearing Network. For more information, visit [http://www.chinabearing.net](http://www.chinabearing.net)