Pinion gear unit and swivel actuator using same

Abstract

Provided are a pinion gear unit and a swivel actuator using same, wherein the pinion gear unit is capable of maximizing a torsional force of a pinion gear and a worm wheel connected to a ring gear. The swivel actuator may include: a lower housing having a hollow cylindrical portion protruding upward from the center thereof, the hollow cylindrical portion serving as a support shaft of a rotor; an upper housing assembled to an upper portion of the lower housing and having a hollow cylindrical portion protruding upward from a central portion thereof; a driving motor having a rotor worm gear formed on an outer circumference of a cylindrical extension portion extending upward from the rotor inside the lower housing; first and second gear trains respectively coupled to the outer circumference of the rotor worm gear inside the upper housing, having first and second worm wheels coupled to the rotor worm gear in the middle of the first and second power transmission shafts, and having first to fourth worm gears formed on both sides thereof; first to fourth pinion gear units having third to sixth worm wheels and first to fourth pinion gears gear-coupled to the first to fourth worm gears, respectively; and a rotary table having a ring gear to which the first to fourth pinion gears are coupled and rotated.