| 摘要 |
PROBLEM TO BE SOLVED: To provide a speed reducer capable of easily mounting a motor while securing a hollow space in a rotation central part of the speed reducer, and easily changing a reduction ratio. SOLUTION: The hollow space is formed in the rotation central part of the reducer, a motor mounting member 24 is mounted for constantly keeping a distance between the center of the rotation and a motor rotating shaft, and a preliminary stage reduction part 32 for reducing a speed of the output rotation of the motor is mounted between the center of rotation and the motor rotating shaft. |
