| CPC F16H 1/32 (2013.01) [F16H 57/021 (2013.01); H02K 7/116 (2013.01); F16H 2001/323 (2013.01); F16H 2001/327 (2013.01); F16H 2057/02034 (2013.01); F16H 2057/02052 (2013.01)] | 6 Claims |
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1. A speed reducer comprising:
a casing;
a crankshaft having a rotation support part rotatably supported by the casing and an eccentric part eccentric with respect to the rotation support part, and rotating in response to a rotation force from outside; and
a speed reducer main body having an engagement part engaged with an outer circumferential surface of the eccentric part, decelerating rocking rotation of the eccentric part received by the engagement part, and outputting the decelerated rotation to outside,
wherein the crankshaft is provided with a flange part protruding to an outward side in a radial direction from an end part of the rotation support part on the eccentric part side and abutting an end surface of the engagement part in an axial direction,
the flange part is formed such that a center thereof in a direction orthogonal to the axial direction coincides with a center of the eccentric part in a direction orthogonal to the axial direction,
the rotation support part is rotatably supported by the casing via a rotation support bearing,
the rotation support bearing is engaged with an outer circumferential surface of the rotation support part and abuts directly on an end surface of the flange part,
an outer diameter of the rotation support part is larger than an outer diameter of the eccentric part, and an outer diameter of the rotation support bearing is larger than an outer diameter of the engagement part.
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