| 摘要 |
In a seat belt retractor, a torsion pipe is disposed inside an annular space between a spool and a torsion bar. One end portion of the torsion pipe is connected to pins, and the other portion engages an externally threaded shaft at a locking base to move axially relative to the externally threaded shaft. When the spool rotates relative to the locking base in the webbing withdrawal direction, the torsion bar and the torsion pipe are both twisted and deformed, so that impact energy is absorbed.
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