Excavator slewing bearing: the "rotating waist" of the excavator, understand the core knowledge in one article

The slewing bearing is the core rotating component of the excavator. It is called the "rotating waist" of the excavator. It connects the upper vehicle (cab, boom) and the lower vehicle (chassis, crawler tracks) to achieve 360° continuous rotation operation. It is one of the most stressed and critical components of the entire machine.

It is mainly composed of outer ring, inner ring, rolling elements, seals, gears, etc. It can withstand axial force, radial force and overturning moment, and is suitable for compound actions such as excavator digging, rotation, and arm lifting.

The core role of excavator slewing bearings

1. Achieve 360° rotation: allow the loading part to rotate flexibly to complete multi-directional operations

2. Bear the load of the entire machine: bear the dead weight of the excavator, excavation impact force and heavy load moment

3. Ensure stable operation: reduce shaking, improve operating accuracy and equipment safety

Common types

The mainstream of excavators uses single-row four-point contact ball slewing bearings. Some large-tonnage models use double-row reducing ball type and three-row roller type. They have compact structure, strong load-bearing capacity, and are suitable for engineering working conditions.

Daily maintenance points

• Regularly add special grease to reduce gear and rolling element wear

• Check the seals to prevent dust, mud, water, and sand from entering the interior

• Tighten the connecting bolts in time to avoid loosening and causing malfunctions

• If abnormal noise, jamming, or inability to rotate occurs, stop the machine immediately for maintenance.

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https://yqforging.com/en/excavator-slewing-bearing/7619.html