| 摘要 |
PROBLEM TO BE SOLVED: To prevent thread connection from getting loose when screwing a pulley to a shaft. SOLUTION: The pitch length of the second male screw 212 is made shorter than the pitch length of the first male screw 211. Thereby, the pulley 100 can not move larger than the moving length of a nut 213 and hence, the pulley 100 is restricted from slacking by a nut 213 and the thread connection is prevented from getting loose. |
