Patent ID: 11920657
Assignee: MINTROBOT CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 8:
9. A cycloidal reducer comprising:
a reduction unit configured to reduce an input torque; and
an output unit configured to be supplied with a preset reduction torque through the reduction unit and to transfer an output torque to the outside,
wherein the reduction unit comprises:
an input shaft configured to be supplied with the input torque;
a cycloidal rotor arranged on an outer circumferential surface of the input shaft in an eccentrically rotatable manner, a plurality of through-holes being formed in a lateral surface of the cycloidal rotor in such a manner as to be arranged to be equally spaced along a circumferential direction thereof, and tooth-type protrusions being formed in the lateral surface thereof along a circumference of an edge thereof;
a hollow housing configured to accommodate the cycloidal rotor and including a plurality of inner pins that are arranged along a circumference of an inner circumferential surface thereof in such a manner as to possibly come into contact with the tooth-type protrusions, respectively, of the cycloidal rotor;
a plurality of rotor pins arranged within the plurality of through-holes, respectively, in the cycloidal rotor arranged in an axial line direction of the input shaft; and
a bushing arranged between the through-hole and the rotor pin and configured to fill a gap between the through-hole and the rotor pin and thus to be rotated together with the rotor pin when the rotor pin is rotated;
wherein the bushing is formed of an elastic material and has the same strength as or a lower strength than the rotor pin, and
wherein the tooth-type protrusions of the cycloidal rotor are formed in such a manner as to be equally spaced along the circumference of the edge of the cycloidal rotor, and
wherein each of the tooth-type protrusions comprises:
a recess portion in the shape of a circular arc that has a first radius of curvature and is engaged with each of the plurality of inner pins; and
a protrusion portion having at least one radius of curvature different from the first radius of curvature and formed in such a manner as to protrude between the recess portions;
wherein a difference in the number of teeth, which is a difference between the number of the recess portions and the number of the inner pins, is 2 or greater.