| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for production of an expandable shaft in which lubricant is smoothly fed to a sliding surface, the sliding resistance is maintained small for a long time, and the lifetime of the expandable shaft is enhanced, and to provide the expandable shaft produced by the method. SOLUTION: A covered part 61 is formed over the entire length in the axial direction of a tooth of a male shaft 16A, and a groove of a female shaft 16B is housed over the entire length in the axial direction of a tooth 1 of the male shaft 16A. Next, the load P in the direction orthogonal to the axis of the female shaft 16B is applied to an upper end of the male shaft 16A. As a result, the male shaft 16A is relatively folded with respect to the female shaft 16B. Thus, a part Q and a part R in a vicinity of both ends in the axial direction of the covered part 61 are strongly compressed, and chamfered portions 62, 62 are formed in a vicinity of both ends in the axial direction of the covered part 61. COPYRIGHT: (C)2009,JPO&INPIT |
