| 摘要 |
A seat belt retractor includes a seat belt, a spool, and an emergency locking mechanism for preventing the spool from rotating in a belt withdrawal direction. The emergency locking mechanism allows rotation of the spool not in operation and prevents the rotation of the spool in the belt withdrawal direction when in operation. A lock gear includes ratchet teeth on an outer periphery of the emergency locking mechanism arranged in an annular shape. The lock gear rotates with the spool when the emergency locking mechanism is not in operation and actuates the locking mechanism when the emergency locking mechanism is in operation. A vehicle sensor includes an engaging claw and detects a vehicle deceleration larger than a predetermined deceleration. The engaging claw engages with one of the ratchet teeth to prevent rotation of the lock gear in the belt withdrawal direction.
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