| 摘要 |
PROBLEM TO BE SOLVED: To make a revolving shaft more compact and lightweight while tightly fixing a mount component to the revolving shaft without increasing the weight nor mass of the revolving shaft.SOLUTION: A tool contact part 24g on which tools T1, T2 for mounting a ball bearing 40 and an armature core 26 from an axial direction of an armature shaft 24 abut is provided between a worm part 24b and a bearing member mount part 24c. Therefore, even when a diameter of the worm part 24b is made small and a tooth height of a worm 24a is made large, the ball bearing 40 and armature core 26 can be tightly fixed by being pressed in and so on from the axial direction of the armature shaft 24 while the tools T1, T2 abut on the tool contact part 24g. Therefore, no large load needs to be placed in a radial direction of the armature shaft 24 unlike before, and a revolving shaft can be made more compact and lightweight without increasing the weight nor mass of the armature shaft 24. |
