| 摘要 |
A seat belt retractor including an energy absorbing mechanism which can reliably satisfy a requirement to absorb the energy flexibly is provided. When a first pulley is rotated clockwise by an extraction of a webbing in an emergency, a wire, which is connected to the first pulley at one end, is pulled. Thus, a second pulley, to which the other end of the wire is connected, is rotated clockwise around a second rotational shaft The second rotational shaft is disposed at a position away from the center of the second pulley. Thus, the rotational diameter gradually increases and a torque applied by the wire for rotating the second pulley is gradually reduced. Since the second rotational shaft is connected to a torsion bar, a load applied to the torsion bar is reduced after reaching a limit load.
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