Abstract: A winding control method of a seatbelt retractor for winding a seatbelt with a motor includes detecting a current flowing through the motor, and stopping the motor when the current exceeds a predetermined value. The winding action is not stopped while the motor is accelerated even when the current exceeds the predetermined value.

Abstract: A method of controlling a seatbelt retractor having a mechanism for retracting a seatbelt with a motor includes the steps of receiving a door-open signal; determining whether the door-open signal is received after a predetermined time since a door-lock release signal is input; and retracting the seatbelt only when the door-open signal is received after the predetermined time since the door-lock release signal is input.

Abstract: A seatbelt retractor for winding a seatbelt includes a spool for winding the seatbelt, a motor for generating rotational torque to rotate the spool, and a clutch mechanism. The clutch mechanism connects a power transmission path to transmit the rotational torque of the motor to the spool in a connected mode, and disconnects the power transmission path in a disconnected mode. A noise preventing device prevents noise when the clutch mechanism becomes the disconnected mode.

Abstract: A retractor with a large reduction ratio to obtain torque enough for winding a seat belt without increasing the size, comprises a spool for winding a seat belt, a motor for generating driving torque to rotate the spool, and a power transmission gear mechanism for transmitting the driving torque of the motor to the spool. The power transmission gear mechanism is provided with a hypocycloid gear mechanism for reducing the rotational speed of the motor while transmitting the rotation of the motor to the spool.

Abstract: A seatbelt retractor includes a spool for winding a seatbelt, a motor for generating rotational torque to rotate the spool, a clutch mechanism for connecting a power transmission path to transmit rotational torque of the motor to the spool in a connected mode and for disconnecting the power transmission path in a disconnected mode, and a clutch mechanism disconnection detecting device for detecting disconnection of the clutch mechanism. A motor control device stops the motor according to a detection signal from the clutch mechanism disconnection detecting device.

Abstract: In controlling a seatbelt retracting device having a mechanism for retracting a seatbelt with a motor, a current flowing to the motor is detected, and a rate of increase in the current is calculated. When the rate of increase exceeds a predetermined value, the motor is stopped. When the current exceeds a predetermined value, the motor is stopped as well.

Abstract: A seatbelt retractor includes a spool for winding a seatbelt; a locking mechanism having a locking member rotatable together with the spool in a normal condition and being prevented from rotating in a seatbelt-withdrawing direction in an emergency condition; an energy-absorbing mechanism interposed between the spool and the locking member for absorbing shock energy exerted on a passenger when the spool rotates in the seatbelt-withdrawing direction relative to the locking member in the emergency condition; and a motor for generating power to rotate the spool. A power transmission mechanism is connected to the locking member for transmitting the power of the motor to the spool through the power transmission mechanism, the locking member, and the energy-absorbing mechanism.

Abstract: A seat belt retractor for winding a seat belt includes a spool for winding the seat belt, a motor connected to the spool for generating driving torque to rotate the spool, a driving torque transmission mechanism disposed between the motor and the spool and formed of a gear for transmitting the driving torque of the motor to the spool, and a torque limiter mechanism disposed in the driving torque transmission mechanism for preventing a load greater than a predetermined level from being. transmitted to the driving torque transmission mechanism.

Abstract: A seat belt retractor includes a spool for winding up a seat belt; a motor for generating rotational torque to rotate the spool; and a power transmission mechanism for transmitting the rotational torque of the motor to the spool. The seat belt retractor winds the seat belt on the spool with the rotational torque of the motor. The power transmission mechanism has a low reduction ratio transmission mode in which the rotational torque of the motor is transmitted to the spool through a low reduction ratio mechanism, and a high reduction ratio transmission mode in which the rotational torque of the motor is transmitted to the spool through a high reduction ratio mechanism. The seat belt retractor further includes a power transmission mode switching mechanism for selecting between the low reduction ratio transmission mode and the high reduction ratio transmission mode.