| 摘要 |
PROBLEM TO BE SOLVED: To prevent looseness of screw joining when joining a pulley to a shaft by a screw. SOLUTION: A second male screw part 212 is formed as an inverse directional screw to a first male screw part 211. Thus, when the pulley 100 loosens since large negative torque acts, the pulley 100 moves to the nut 213 side, and while, since a nut 213 fastens (moves to the pulley 100 side), looseness of the screw joining of the pulley 100 is prevented. |
