| 摘要 |
PROBLEM TO BE SOLVED: To increase a flexural critical frequency by interference-fitting either of a pair of discs of a flexible disc shaft on the first rigid shaft and the other of them on an about cap-shaped member of a tie bolt shaft. SOLUTION: A flexible disc shaft 40 is equipped with the first and the second flexible disc member 47, 48 connected through a quill shaft 50, and the member 47 has a flexible disc 51 and a cylindrical side face 52, and the member 48 has a flexible disc 53 and a cylindrical side face 54 and moreover is about cup-shaped, and a power head end part 55 has an outside diameter slightly smaller than the residual part of the cylindrical side face 54. The cylindrical side face 52 is interference-fitted on the end 24 on the side of the power head of a permanent magnet shaft 28, and the cylindrical side face 46 of a cup-shaped member 45 of a tie bolt shaft 34 is interference-fitted an opened end 55. A rigid body critical frequency can be lowered beyond a range to be considered during ordinary action by the above composition to increase the first flexural critical frequency. |
