Patent ID: 7380740
Filing Date: 2008-06-03
Classification: B60R

Abstract:
1. A seat belt retractor, comprising: a spool for winding up a seat belt; a motor configured to generate rotational torque for rotating the spool; and a power transmission mechanism configured to transmit the rotational torque of the motor to the spool, the seat belt being wound on the spool by the rotational torque of the motor, wherein the power transmission mechanism includes a low reduction ratio power transmission mode in which the rotational torque of the motor is transmitted to the spool at a high speed and with low torque and a high reduction ratio power transmission mode in which the rotational torque of the motor is transmitted to the spool at a low speed and with high torque, wherein the seat belt retractor further comprises a power transmission mode switching mechanism that selectively sets the power transmission mechanism into either the low reduction ratio power transmission mode or the high reduction ratio power transmission mode, and