Seat Belt Retractor, Seat Belt Apparatus, and Vehicle with Seat Belt Apparatus

摘要

A structure is provided in winch seat belt tension acting on a seat belt for occupant restraint installed in a vehicle is controlled by means of driving of an electric motor and which is effective and provides high level of convenience when the vehicle is reversed. In a seat belt retractor 1 of a seat belt apparatus 100 which is installed in a vehicle, when a seat belt 3 is worn by a vehicle occupant C and the vehicle is reversed, a motor is controlled to rotate a spool to unwind the seat belt so as to reduce the seat belt tension acting on the seat belt 3 (Fig. 1).