Worm Gear slewing drive bearings are usually found in application such as: wind turbines, heavy load transporters, solar trackers, harbor cranes, hydraulic equipment, crane steering mechanisms, automation systems, heavy load manipulators, yaw and pitch control tables.Ball Bearing based design to handle simultaneously occuring radial, axial, and moment loads Hydraulic Motor Ready (Can also be equipped with electric motor/gearbox)．According to the variable speed drive of rotation drive form, can be divided into type rotary gear rotation drive and the worm and worm wheel drive, inherit the characteristics of gear transmission and worm gear and worm drive each, are the two kinds of rotation drive can be adapted to high speed and low speed applications, in terms of bearing capacity, performance is superior to the tooth worm gear and worm type, and when envelope worm drive is used, its bearing capacity, deformation resistance and transmission have further improve rigidity, but the worm gear and worm type rotary drive are inferior to tooth rotation drive in terms of efficiency．