Slewing bearings, also known as slewing rings, are specialized bearings designed to support axial, radial, and moment loads, typically used in applications like cranes, wind turbines, and excavators. They are classified based on their structural design, the number of rolling elements, and the type of load they are designed to handle.
Slewing Bearing Types
1. Single-Row Four-Point Contact Ball Bearings
Description: These bearings have a single row of balls that make four points of contact with the raceways.
Features:
Capable of handling axial, radial, and moment loads simultaneously.
Compact design.
Moderate load-carrying capacity.
Applications: Cranes, excavators, turntables, and light-duty equipment.
2. Single-Row Crossed Roller Bearings
Description: This type has a single row of cylindrical rollers arranged in a crisscross pattern, alternating at 90° angles.
Features:
High precision and rigidity.
Excellent for applications requiring minimal deflection.
Can handle higher moment loads compared to ball bearings of similar size.
Applications: Robotics, medical equipment, and precision machinery.
3. Double-Row Ball Bearings
Description: These bearings have two rows of balls, typically separated by a spacer.
Features:
Higher load-carrying capacity compared to single-row designs.
Handles heavy axial and radial loads but limited moment load capability.
Applications: Wind turbines, heavy-duty cranes, and construction machinery.
4. Three-Row Roller Bearings
Description: These bearings consist of three separate rows of rollers, each designed to carry a specific type of load (radial, axial, or moment).
Features:
Extremely high load-carrying capacity.
Larger size and heavier weight compared to other types.
Applications: Large excavators, ship cranes, and heavy-duty rotating machinery.
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