Construction machinery such as excavators, loaders, reducers, cranes and mining machinery is characterized by heavy load, impact load, low speed and harsh working conditions. Ordinary ball bearings cannot withstand such conditions, so various roller bearings are required.

There are three main types of commonly used heavy-duty bearings:

• Spherical roller bearings: Self-aligning, capable of bearing heavy radial load and bidirectional axial load. Ideal for mining equipment, cement machinery, large reducers and vibrating machinery where shaft misalignment and heavy impact loads exist.
• Tapered roller bearings: Can bear both radial and unidirectional axial load, easy to assemble/disassemble and strong in load capacity. Widely used in construction machinery hubs, gearboxes, axles and transmission parts.

• Cylindrical roller bearings: Extremely high radial load capacity and high rigidity, suitable for large gearboxes, heavy-duty machine tool spindles and construction machinery transmission systems.

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Three key points for overseas procurement of such heavy-duty bearings:

1. Material and heat treatment: Inferior roller bearings are prone to raceway spalling and roller fracture.
2. Precision and clearance matching: Standard clearance is not suitable for heavy-duty equipment.

3. Packaging and marine rust prevention: Construction machinery bearings are large and heavy, easy to rust during sea transportation.

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