| 摘要 |
PROBLEM TO BE SOLVED: To suppress the enlargement of a part on an input side, in a center crank type eccentric rocking gear device.SOLUTION: A center crank type eccentric rocking gear device 1 includes: an outer cylinder 2 provided with an internal tooth 22; a center crank shaft 3 having an eccentric portion 30, and rotatably provided around an axis in the outer cylinder 2; a rocking gear 4 having a through hole into which the eccentric portion 30 is inserted, having outer teeth 41a and 42a, and in which the outer teeth 41a and 42a rock and rotate together with the eccentric rotations of the eccentric portion 30 while being meshed with the inner tooth 22; and a carrier 5 relatively rotated to the outer cylinder 2 by transmitting the rocking rotations of the rocking gear 4. A center crank shaft 3 of the gear device 1 has a hollow portion 33 opening to at least one end portion side in its axial direction. On an inner peripheral surface of the hollow portion 33, a crank shaft inner tooth 34 with which an input tooth 7 is meshed is provided. |
