| 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: While the tip of a large-diameter part 16a of an inner shaft 13a is engaged with the tip of a small-diameter part 14 of an outer shaft 12a, an outer circumferential surface of the small-diameter part 14 is pressed radially inward to plastically deform both tips radially inward. Shafts 12a, 13a are relatively displaced in an axial direction to be close to each other. The amount of pressing radially inward the outer circumferential surface of the tip of the small-diameter part 14 is smaller in a part near the tip edge of the tip of the large-diameter part 16a than in a part near the center. In the relative displacement, seizure is prevented in a friction part between the tip edge of the large-diameter part 16a and the inner circumferential surface of the small-diameter part 14. <P>COPYRIGHT: (C)2013,JPO&INPIT |
