| 摘要 |
PROBLEM TO BE SOLVED: To improve the design of an existing rear part windage nut. SOLUTION: A nut 44 for a rotor fastening bolt has a nut main body having a center hole 46 with a screw thread in it, a first peripheral edge surface 56 on one side of the center hole extending in the both side directions by sraddling over the center hole and to constitute a pair of wing parts 52, 54 and second and third peripheral edge surfaces 62, 64 including a pair of supporting wall parts 68, 70 to support the wing parts, the support wall parts of which are respectively connected to both ends of the first peripheral edge surface 56 and which are connected to each other on a roundish surface 66 on the opposite side of the center hole. |
