| 摘要 |
A seat belt retractor includes a spool for winding a seat belt, and a locking device having a locking member. A first seat belt load limiting mechanism is attached to the spool to transmit a load applied to the seat belt to the locking member in the normal state and limit the load when the spool rotates is locked by the locking member. A second seat belt load limiting mechanism is provided coaxially with the spool for changing the load of the seat belt in the emergency. A control unit sets the second seat belt load limiting mechanism to anon-operational state when a predetermined condition is not satisfied regardless of an emergency, and sets the second seat belt load limiting mechanism to an operational state when the predetermined condition is satisfied in the emergency.
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