CPC F16H 1/32 (2013.01) [H02K 7/116 (2013.01); B60N 2/0232 (2013.01); B60N 2/1857 (2013.01); B60N 2002/0236 (2013.01); F16H 2001/327 (2013.01); F16H 2035/006 (2013.01)] | 29 Claims |
1. A speed reducer comprising:
a first gear that rotates due to rotational force being transmitted thereto;
an eccentric shaft joined to the first gear, the eccentric shaft having a first supporting portion and a second supporting portion that are offset in a rotation radial direction with respect to a rotation shaft of the first gear;
a fixed gear disposed at a radial direction outer side of the eccentric shaft, rotation of the fixed gear being restricted;
a transmitting gear that is supported at the first supporting portion and meshes with the fixed gear, wherein, due to the first gear rotating together with the eccentric shaft, the transmitting gear revolves around the rotation shaft of the first gear and rotates around its own axis;
an outputting portion that rotates due to the transmitting gear revolving and rotating around its own axis; and
a locking gear that is supported at the second supporting portion and meshes with the fixed gear, wherein, due to the first gear rotating together with the eccentric shaft, the locking gear revolves around the rotation shaft of the first gear and rotates around its own axis, and, due to revolving and rotation around its own axis of the locking gear being restrained, rotation of the outputting portion is restricted.
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