| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an impact absorbing steering shaft and a manufacturing method thereof designed to prevent seizure at a friction part between the tip edge of a large-diameter part of an outer shaft and an inner circumferential surface of a small-diameter part of an inner shaft, while preventing an increase in manufacturing cost. <P>SOLUTION: A tip of a large-diameter part 16a is fitted into a base end of a small-diameter part 14 when an impact is applied upon a secondary collision, with a fitting strength to relatively displace the outer shaft 12a and the inner shaft 13a in the axial direction. The inner circumferential surface of a concave hole 21 formed at the tip of the large-diameter part 16a is tapered, while the radial thickness of the large-diameter part 16a is reduced toward the tip edge of the large-diameter part 16. The tip edge of the large-diameter part 16a is prevented from digging into the inner circumferential surface of the small-diameter part 14 when the shafts 12a and 13a are assembled to each other. <P>COPYRIGHT: (C)2013,JPO&INPIT |
