PROBLEM TO BE SOLVED: To reduce excessive load into a terminal part of a spiral spring.SOLUTION: A seat belt retractor comprises: a case that houses a spiral spring which biases a spool in a winding direction of a seat belt; and a gear which rotates in a state of being eccentric relative to a rotation axis of the spool. The spiral spring comprises: an inner terminal part connected to the rotation axis; and an outer terminal part connected to an outer peripheral part of the case. The case comprises: internal teeth which engage with external teeth of the gear so as to form a hypocycloid mechanism; and a contact surface which comes into contact with a boss protruding from a board face of the gear to thereby couple the rotation axis with the case. The contact surface has a first contact surface with which the boss come into contact in a relaxation state in which the spiral spring is deviated to the outside of the case, and a second contact surface with which the boss comes into contact in a lifting state in which the spiral spring is deviated to the inside of the case.SELECTED DRAWING: Figure 7

    【課題】スパイラルスプリングの端末部に入る過剰な負荷を低減すること。【解決手段】スプールをシートベルトの巻き取り方向に付勢するスパイラルスプリングを収容するケースと、前記スプールの回転軸に対して偏心した状態で回転するギアとを備え、前記スパイラルスプリングは、前記回転軸に接続された内側端末部と、前記ケースの外周部に接続された外側端末部とを有し、前記ケースは、ハイポサイクロイド機構を構成するように前記ギアの外歯と噛み合う内歯と、前記ギアの盤面から突出するボスと当接することで前記回転軸と前記ケースとを結合させる当接面とを有し、前記当接面は、前記スパイラルスプリングが前記ケースの外側に偏倚した弛緩状態で前記ボスが当接する第1の当接面と、前記スパイラルスプリングが前記ケースの内側に偏倚した巻き上げ状態で前記ボスが当接する第2の当接面とを含む、シートベルトリトラクタ。【選択図】図7


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    Title :

    SEAT BELT RETRACTOR


    Additional title:

    シートベルトリトラクタ


    Contributors:

    Publication date :

    2018-01-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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