| 摘要 |
To ensure stable EA operation without being affected by action of a pretensioner. A seat belt retractor comprises a torsion bar 7 of which one end in the axial direction is connected to a spool 4 and which is torsionally deformable because of relative displacement between the one end side and the other end side in the axial direction, a pretensioner 11 which is disposed on the other end side in the axial direction of the spool 4 and which rotates the spool 4 in a direction 10. of winding a seat belt 3 when the vehicle rapidly decelerates, a main pawl 12 which is disposed on one end side in the axial direction of the spool 4, and a sub pawl 13 which is disposed on the other end side in the axial direction of the torsion bar 7. During the normal operation, the main pawl 12 is actuated to lock the spool 4 to prevent the spool 4 from rotating in the direction of withdrawing the seat belt 3. When the vehicle rapidly 15 decelerates, the locking of the spool 4 by the main pawl 12 is released, while the sub pawl 13 is actuated to prevent the other end side in the axial direction of the torsion bar 7 from rotating in the direction of withdrawing the seat belt 3.
|
