To provide an extending and contracting shaft reduced in sliding resistance of a male shaft and a female shaft in extending and contracting, and a steering device including the extending and contracting shaft.SOLUTION: An extending and contracting shaft has a columnar male shaft 15, a cylindrical female shaft 16 externally fitted to the male shaft 15, a plurality of rolling elements 17 axially rollably disposed between the male shaft 15 and the female shaft 16, and a columnar body 19 axially slidably disposed between the male shaft 15 and the female shaft 16, and extended in the axial direction. The columnar body 19 includes a torque transmission portion 19a kept into contact with the male shaft 15 and the female shaft 16 to transmit torque, and a torque non-transmission portion 19b integrally formed with the torque transmission portion 19a and not kept into contact with the male shaft 15 and the female shaft 16, along the axial direction, at least one each.SELECTED DRAWING: Figure 2
【課題】伸縮時の雄軸と雌軸との摺動抵抗を低減した伸縮軸、該伸縮軸を備えたステアリング装置を提供する。【解決手段】柱形状の雄軸15と、雄軸15に外嵌された筒形状の雌軸16と、雄軸15と雌軸16の間に軸方向に転動自在に配置された複数の転動体17と、雄軸15と雌軸16の間に軸方向に摺動可能に配置された軸方向へ延在する柱状体19とを有し、柱状体19が、軸方向に沿って、雄軸15と雌軸16に当接してトルクを伝達するトルク伝達部19aと、トルク伝達部19aに一体的に形成されており雄軸15と雌軸16に非接触のトルク非伝達部19bとを少なくとも1つずつ含むことを特徴とする伸縮軸。【選択図】図2
EXTENDING AND CONTRACTING SHAFT AND STEERING DEVICE
伸縮軸、ステアリング装置
2019-06-06
Patent
Electronic Resource
Japanese