Swivel actuator

A swivel actuator comprising:

• a lower housing having a hollow cylindrical portion protruding upward at a center thereof;
• an upper housing stacked and assembled on an upper portion of the lower housing and having a through hole formed in a central portion thereof in which the hollow cylindrical portion protrudes upward through the through hole;
• a driving motor arranged on a bottom surface of the lower housing and having a rotor worm gear integrally formed on an outer periphery of a cylindrical rotor support extending upward through a through hole of the upper housing;
• first and second gear trains, each being arranged at 180 degree intervals at the outer periphery of the rotor worm gear and being coupled thereto, having, in the middle of first and second power transmission shafts, first and second worm wheels gear-coupled to the rotor worm gear, and having first to fourth worm gears formed at both sides of each of the first and second power transmission shafts;
• first to fourth pinion gear units in which third to sixth worm wheels gear-coupled to the first to fourth worm gears are formed at the lower ends of first to fourth support shafts, respectively, and first to fourth pinion gears are integrally formed on the upper ends of the first to fourth support shafts, respectively;
• and
• a rotary table gear-coupled to a ring gear having the first to fourth pinion gears integrally formed on the inner side of the side surface portion thereof, so as to rotate.