A slewing drive is an integrated system combining a slewing bearing, worm gear, and housing, designed to provide robust rotational motion under complex loads. Its core function is to transmit torque while supporting axial, radial, and moment loads simultaneously—a critical requirement in applications like solar trackers and cranes . The worm gear system, often with ratios ranging from 52:1 to 102:1, ensures high torque output and self-locking capabilities, preventing back-driving in vertical load scenarios .

Key technical parameters define a slewing drive’s suitability:

1. Load Capacity: Static axial loads can exceed 970 kN, while tilting moment torque may reach 135.6 kN·m in heavy-duty models .

2. Efficiency & Self-Locking: Worm gear systems typically achieve 40%–50% efficiency, with lower lead angles enabling self-locking for safety-critical applications .

3. Environmental Resilience: IP65-rated sealing protects against dust and water ingress, while corrosion-resistant materials (e.g., C4 category coatings) ensure longevity in harsh environments .

Selecting a slewing drive requires aligning these parameters with operational demands. For instance, solar trackers prioritize tracking accuracy (e.g., 0.2°) and wind load resistance (up to 55 m/s), while industrial cranes demand higher moment load capacity and impact resistance . Additionally, material choices such as 42CrMo4 steel for bearings and centrifugally cast bronze for worm wheels enhance durability under cyclic stresses .