Driving motor having BLDC motor and swivel actuator using the same

A swivel actuator comprising:

• a cylindrical housing in which a hollow cylindrical portion protrudes from a bottom of a center thereof and first and second step portions protrude from an inner side wall thereof;
• a drive motor which is arranged on a bottom surface of the housing and has a cylindrical first worm gear integrally formed on an outer circumference of a cylindrical extension unit extending to an upper portion of the rotor;
• first and second gear trains which are arranged to face each other on the upper portion of the second step portion, respectively, and are coupled to the outer circumference of the first worm gear in which second and third worm wheels gear-coupled to the first worm gear are respectively formed on either one side of first and second power transmission shafts, and second and third worm gears are respectively formed on the other sides of the first and second power transmission shafts;
• first and second pinion gear units having fourth and fifth worm wheels formed at lower ends thereof to be gear-coupled to the second and third worm gears, respectively, and having first and second pinion gears integrally formed at the upper ends thereof;
• a rotary table in which the first and second pinion gears of the first and second pinion gear units are gear-coupled to a ring gear formed integrally on an inner side of a side surface portion thereof to rotate;
• and
• a plurality of set screws for pushing and fixing the first and second power transmission shafts to one side, wherein
• the axial displacement of the first and second power transmission shafts is suppressed by tightening the set screws from the outside through set screw adjustment through-holes formed in the housing.

A swivel actuator comprising:

• a cylindrical housing having a hollow cylindrical portion protruding in a vertical direction from a bottom thereof at a center thereof;
• a brushless direct-current (BLDC) drive motor installed on the bottom of the housing in a vertical direction to allow a rotor to rotate around a hollow cylindrical portion;
• a cylindrical first worm gear integrally formed on an outer circumference of a cylindrical extension part extending to an upper portion of the rotor;
• first and second gear trains each having one side coupled to an opposite outer circumference of the first worm gear to reduce a rotational speed of the drive motor to generate a torque-increased rotational output;
• a rotary table having a central portion rotatably coupled to the hollow cylindrical portion of the housing and a ring gear integrally formed inside a side surface portion thereof;
• and
• first and second pinion gear units of which lower end portions are respectively coupled to the other sides of the first and second gear trains and upper end portions are inscribed in an inner circumferential portion of the ring gear facing the ring gear, to transfer a torque-increased rotational output to the rotary table, wherein
• the first and second gear trains include first and second power transmission shafts each having a worm wheel formed on one side thereof to be gear-coupled to the first worm gear and a second worm gear formed on the other side thereof to be gear-coupled to the ring gear, and
• one or both ends of each of the first and second power transmission shafts are supported by a plurality of set screws to suppress the occurrence of axial displacement.