| 摘要 |
PROBLEM TO BE SOLVED: To provide a telescopic shaft for highly maintaining the suppression effect of an unusual sound for a long time. SOLUTION: An intermediate shaft 2 has an inner shaft 13 and a cylindrical outer shaft 14 that are fitted each other via a row of balls 17A, 17B, 17C, 17D as first and second rows. The row of balls 17A, 17C are directly engaged so that torque can be transmitted to the inner shaft 13 and the outer shaft 14 only when the inner shaft 13 is rotated in a first rotary direction T1 to the outer shaft 14. The row of balls 17B, 17D are directly engaged so that torque can be transmitted to the inner shaft 13 and the outer shaft 14 only when they are rotated in a second rotary direction T2. While extension sections 31, 32 as the first and second spring elements elastically energize a ball 17 so that the play of the ball 17 of the corresponding row of balls 17A, 17B, 17C, 17D is eliminated, they do not contribute to the transmission of torque, the amount of deformation is regulated, and no permanent set is generated for a long time. COPYRIGHT: (C)2006,JPO&NCIPI
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