Introduction to 011 & 012 Series Four-Point Contact Ball Slewing Bearings (External Gear Type)

The 011 and 012 series are single-row, four-point contact ball slewing bearings featuring an external gear on the outer ring. These series are specifically designed for applications requiring compact dimensions, high load capacity, and smooth rotational accuracy under combined loads.

Design Features

The bearing consists of an inner ring, an outer ring with external teeth, and a single row of steel balls. The raceways are specially profiled so that each ball contacts the raceways at four distinct points. This unique four-point contact design allows the bearing to simultaneously support axial loads (from either direction), radial loads, and tilting moments – all within a single row of rolling elements.

The external gear (available in different module sizes) enables direct pinion drive integration, eliminating the need for separate gear rings and simplifying the drive train.

Performance Highlights

• Load capacity: Suitable for moderate-to-heavy combined loads

• Accuracy: High rotational precision and low friction

• Rigidity: Good structural rigidity due to optimized raceway geometry

• Space saving: Compact cross-section reduces overall system weight and size

Typical Applications

The 011 and 012 series are widely used in:

• Small-to-medium cranes and excavators

• Aerial work platforms and man lifts

• Solar tracking systems and radar antennas

• Industrial manipulators and robotics

• Medical equipment (e.g., CT scanners, gamma cameras)

Difference Between 011 and 012 Series

While both series share the same four-point contact ball design and external gear arrangement, they differ mainly in dimensions and load ratings. The 011 series is generally more compact for lighter applications, while the 012 series offers increased cross-sectional dimensions and higher load-carrying capacity for more demanding operating conditions.

Conclusion

The 011 and 012 series four-point contact ball slewing bearings with external teeth provide a reliable, space-efficient, and cost-effective solution for applications requiring combined load support and smooth rotation. Their external gear design simplifies drive integration, making them a popular choice in swing turntables, rotating platforms, and positioning systems across various industries.