IMPACT ABSORBING STEERING SHAFT AND IMPACT ABSORBING STEERING DEVICE

PROBLEM TO BE SOLVED: To provide a structure capable of gradually increasing an impact load to be absorbed during a secondary collision.SOLUTION: An impact absorbing shaft part 35 is provided at an intermediate part of an inner shaft 19. An outer peripheral surface of the impact absorbing shaft part is formed as an inclined surface part 37 whose outer diameter increases toward a front side. An annular member 36 made of a synthetic resin is externally fitted to the rear side of the inclined surface part 37 of the inner shaft 19. During a secondary collision, the annular member 36 is pressed forward by a front end surface of an outer tube 20 and expands in diameter while moving forward on the inclined surface part 37. The above problem is solved by adopting this structure.SELECTED DRAWING: Figure 1 【課題】二次衝突時に吸収する衝撃荷重を徐々に増大させる事ができる構造を実現する。【解決手段】インナシャフト１９の中間部に衝撃吸収用軸部３５を設け、その外周面を、前方に向かう程外径が大きくなる傾斜面部３７とする。前記インナシャフト１９のうち、この傾斜面部３７の後側に合成樹脂製の環状部材３６を外嵌する。二次衝突時に、この環状部材３６は、アウタチューブ２０の前端面により前方に押されて、前記傾斜面部３７上を前方に移動しつつ拡径する。この様な構成を採用する事により、上記課題を解決する。【選択図】図１