Patent ID: 9719578
Date: 2017-08-01
CPC Classifications: F16H

Claim:
1. A gear device in which either one of a first input gear and a second input gear is selectively mounted as an input gear, comprising: a crankshaft including a shaft main body and an eccentric portion eccentric with respect to an axial center of the shaft main body; a linking member including external teeth and configured to transmit the rotation of the input gear to the crankshaft; a carrier configured to rotatably support the crankshaft; an oscillation gear oscillating and rotating due to rotation of the eccentric portion; and an outer cylinder including internal teeth engaged with the oscillation gear, wherein: the carrier and the outer cylinder are coaxially and relatively rotate due to oscillation and rotation of the oscillation gear; and the linking member is disposed in either one of a first position where the external teeth are engaged with the first input gear mounted in the gear device and a second position where the external teeth are engaged with the second input gear mounted in the gear device, wherein the linking member includes an engaging portion having a first part extending in an axial direction of the oscillation gear and a second part extending from one end of the first part in a radial direction of the first part and having the external teeth provided at an outer end of the second part; and wherein the engaging portion is configured to selectively assume a first posture where the linking member is in the first position and a second posture which is oriented opposite to the first posture in the axial direction and where the linking member is in the second position.