To reduce the weight of a rack shaft and an electric power steering device.SOLUTION: A rack shaft 12A comprises a first shaft 110 in which a first rack 115 engaged with a first pinion 16 which rotates accompanied by the steering of a steering wheel 1 is formed, and a second shaft 120 in which a second rack 125 engaged with a second pinion 23 which rotates by an electric motor 21 is formed. An outside diameter of the first shaft 110 and an outside diameter of the second shaft 120 differ from each other. The first shaft 110 and the second shaft 120 are connected to each other by friction pressure-welding or the like. The outside diameter of the first shaft 110 to which a relatively-low load acts out of the first shaft 110 and the second shaft 120 is smaller than the outside diameter of the second shaft 120.SELECTED DRAWING: Figure 1

    【課題】ラックシャフト及び電動パワーステアリング装置の軽量化を図る。【解決手段】ラックシャフト12Aは、ステアリングホイール1の操舵に伴い回転する第1ピニオン16と噛み合う第1ラック115が形成された第1軸110と、電動モータ21により回転する第2ピニオン23と噛み合う第2ラック125が形成された第2軸120と、を備え、第1軸110の外径と第2軸120の外径とは異径である。第1軸110と第2軸120とは、摩擦圧接等により結合される。第1軸110及び第2軸120のうち、相対的に低い負荷が作用する第1軸110の外径が、第2軸120の外径よりも小さい。【選択図】図1


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    Title :

    RACK SHAFT AND ELECTRIC POWER STEERING DEVICE


    Additional title:

    ラックシャフト及び電動パワーステアリング装置


    Contributors:

    Publication date :

    2018-11-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B62D MOTOR VEHICLES , Motorfahrzeuge



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