| 摘要 |
The disclosed seat belt retractor can be used in reducing the operational sound caused by the disconnecting operation of the power transmission mechanism when the power transmission mechanism is switched from a connected state to a disconnected state. The power transmission mechanism can be switched from a connected state to a disconnected state by a rotational speed difference between an electric motor and a spool so as to release the connection between the electric motor and the spool. The motor 6 can be controlled to be rotated at an operational sound reducing speed when the power transmission mechanism 8 is switched from the connected state to the disconnected state.
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