| 摘要 |
PROBLEM TO BE SOLVED: To provide an impact absorbing steering shaft capable of smoothly performing relative displacement in the axial direction between an outer shaft 12a and an inner shaft 13a due to an impact load accompanied with a secondary collision, and to provide a method of manufacturing the impact absorbing steering shaft.SOLUTION: The top end part of a large diameter part 16a of an inner shaft 13a is internally fitted and is fixed to the base end part of a small diameter part 14 of an outer shaft 12a with such a fitting strength that the outer shaft 12a and the inner shaft 13a can relatively displace each other in the axial direction in accordance with a shock applied upon a secondary collision. A chamfered part 21 is provided on the outer periphery of the top end part of the large diameter part 16a and, the outer diameter of the large diameter part 16a is reduced toward the top end edge of the large diameter part 16a. Thus, when both shafts 12a, 13a are assembled to each other, galling of the inner circumferential surface of the small diameter part 14 by the top end edge of the large diameter part 16a is prevented. |
