| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an impact absorbing steering shaft that smoothly and relatively displaces an outer shaft and an inner shaft in an axial direction due to an impact load during a secondary collision, and to provide a manufacturing method thereof. <P>SOLUTION: A tip of a large-diameter part 16a of the inner shaft 13a is fitted into a base end of a small-diameter part 14 of the outer shaft 12a 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. A chamfered part 21 is formed at a tip outer rim of the large-diameter part 16a. The outer diameter of the large-diameter part 16a is reduced toward the tip edge of the large-diameter part 16a. 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 |
