| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve construction which is low cost and furthermore is capable of preventing a shaft from being damaged such as indentation even if transmitting a large rotating force (torque). Ž<P>SOLUTION: A transmission shaft is configured so as to provide outer side concave grooves 24, 24 and concave parts 26, 26 on the inner peripheral surface of an outer shaft 21. Moreover, it is configured so as to provide inner side concave grooves 25, 25 and convex parts 27, 27 on the outer peripheral surface of an inner shaft 22. Moreover, it is configured so as to provide balls 23, 23 between the respective outer side and the inner side concave grooves 24, 25, with the outer shaft 21 and the inner shaft 22 incorporated, and at the same time make the convex parts 27, 27 proceed into the concave parts 26, 26. Then, it is configured so as to make it possible to engage (abut) respective side surfaces circumferentially opposed to each other of the concave parts 26, 26 and the convex portions 27, 27 in accordance with a rotating force. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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