Designing a double row ball slewing ring with varying ball sizes requires precise calculation and manufacturing tolerance control. Here is why our approach sets a new benchmark for heavy-duty rotation:
By decoupling the load paths, we ensure that each ball row operates at its peak efficiency. The larger balls absorb massive vertical thrust (common in crane booms), while the smaller balls stabilize lateral shifts. This reduces stress concentration and prevents premature raceway fatigue.
We exclusively use vacuum-degassed forging steel (such as 42CrMo4 or 50Mn) for both rings. The raceways undergo induction hardening to 58-62 HRC, creating a tough surface layer over a ductile core. This "hard shell, soft core" structure absorbs shock loads without cracking—a critical feature for slewing bearings in construction machinery.
Our multi-layer sealing system combines labyrinth channels with high-grade nitrile rubber lips. Some models include grease purge ports, allowing operators to flush out contaminants. This design guarantees long-term lubrication integrity, even in sandy desert mining sites or salty offshore platforms.
Whether you need internal or external gearing, our hobbing and grinding processes achieve DIN Class 9 or better accuracy. The gear teeth are hardened to match the raceway durability, ensuring smooth torque transmission for slew drives.
| Parameter | Specification Range | ||
|---|---|---|---|
| Outer Diameter | 400mm – 3200mm | ||
| Axial Load Capacity | Up to 2,500 kN | ||
| Radial Load Capacity | Up to 1,200 kN | ||
| Tilting Moment | Up to 1,800 kNm |
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| Ball Material | GCr15SiMn, 100Cr6 |
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| Ring Material | 42CrMo4, 50Mn, Q345D |
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| Hardness | 58-62 HRC (Raceway) | ||
| Gear Module | m=4 to m=25 |
Our heavy-duty slewing bearings are deployed in scenarios where failure is not an option:
The telescopic booms of mobile cranes experience immense axial pressure. Our different diameter ball slewing rings support the rotation of the upper carriage while handling the dynamic bending moments caused by lifting heavy loads at long radii.
In wind energy, the pitch system adjusts blade angles to optimize power generation. These bearings must withstand constant cyclic loading and vibration. Our design offers the perfect balance of size and load capacity for 2MW to 5MW turbine generators.
For Ferris wheels and giant observation wheels, passenger safety is paramount. The double-row design provides the redundancy and smoothness required for slow-speed, high-load rotation, ensuring a jerk-free experience for thousands of daily riders.
Ship-to-shore cranes and floating dock cranes operate in corrosive marine environments. Our bearings, treated with specialized anti-corrosion coatings and robust seals, ensure reliable operation despite salt spray and humidity.
Large hydraulic excavators (>30 tons) utilize these bearings for house rotation. The ability to handle shock loads from digging operations makes them indispensable in mining quarries.
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