| 摘要 |
A reduction motor shaft used, for example, in a wiper motor is disclosed, which is provided with screw type double worms constituting a reduction mechanism part. In this reduction motor shaft, right-handed and left-handed screw type worms are coaxially formed in one end side of the shaft as plural-thread screws at a linked state of tooth profiles of both worms, and further an annular protrusion is formed in a threading boundary between the worms. |
