| 摘要 |
[Problem] To provide a seat belt retractor formed in a compact structure and capable of accurate lock operation and smoothly providing seat belt tensile force, and a seat belt device provided with the same. [Solution] A seat belt retractor (3) is provided with: a frame (11); a seat belt (4); a spool (12) rotatably supported on the frame (11) for winding the seat belt (4); a lock mechanism (60) that permits rotation of the spool (12) when not activated while preventing rotation of the spool (12) in a seat belt (4) drawing-out direction when activated; and an energy absorbing mechanism (20) that absorbs and dampens the energy of a passenger by limiting load applied to the seat belt (4). The seat belt retractor (3) is characterized in that the energy absorbing mechanism (20) includes a first torsion bar (21) concentrically contained in the spool (12), with one end portion (21a) being held by the spool (12) and another end portion (21b) capable of being locked by the lock mechanism (60) so that the first torsion bar can be provided with rotating force via torsional force, a second torsion bar (24) contained eccentrically in the spool (12) with one end portion (24a) capable of being locked by the lock mechanism (60) so that the second torsion bar can be provided with rotating force via torsional force, and a moving member (25) that is rotated integrally with the spool (12) and that is moved to a first position for holding another end portion (24b) of the second torsion bar (24) or to a second position spaced apart from the other end portion (24b) of the second torsion bar (24). |
