Slewing ring, also referred to as slewing bearings or turntable bearing, is a large bearing which is able to maintain the more axial load, radial load and tilting moment. It really is referred to as: “machine joints”, the essential machinery transmitting parts, between the two objects that require to become relative rotary motion. It gets the inner and outer band, rolling and other elements.
One can consider the slewing drive as a gearbox because the core worm gear slew drive motion components are the slewing bearing and worm shaft. It also consists of auxiliary elements such as seals, housing, and electric motor. As a power source, slew motor is normally DC planetary gear motor or AC gear motor. AC hydraulic engine is mainly used in the building machinery as a power drive system. As the primary component is slewing band travel, slewing gearbox can readily endure the axial and radial forces. The slew travel working principle: The worm is powered by the electric motor, which drives the outer ring of the slewing ring to rotate; The external ring output the torque through the flange and the internal ring of the slewing ring is set in the housing.
Slewing drive has reverse self-locking because of worm gear drive with reverse 
self-locking features. This feature greatly enhances the stability of the host operating and safety element. When compared to traditional swing items, slewing travel gearbox is simple to install, simple to maintain, and will save considerable installation space.
worm gear slew drive
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