| CPC F16H 1/32 (2013.01) [F16H 55/10 (2013.01); F16H 57/021 (2013.01); F16H 2001/325 (2013.01); F16H 2001/327 (2013.01)] | 17 Claims |
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1. 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; and
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,
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, and
wherein the recess portion has a circumferential length that is smaller than a circumferential length of a semicircle having the first radius of curvature,
wherein the inner pin of the housing is formed in the shape of a circle in such a manner that an outer circumferential surface thereof has a fourth radius of curvature that is the same as the first radius of curvature or is smaller than the first radius of curvature, and
wherein a plurality of inner pin fixation grooves within which the plurality of inner pins, respectively, are fixed, are formed in an inner circumferential surface of the housing, and each of the plurality of inner pin fixation grooves has a circumferential length that is greater than or the same as a circumferential length of a semicircle having the fourth radius of curvature.
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