BELT RETRACTOR HAVING AN ELECTRIC MOTOR

A belt retractor having a belt shaft which is mounted rotatably on a frame fastenably fixed to a vehicle and on which belt shaft a seat belt can be wound, and having an electric motor for driving the belt shaft to perform a rotational movement, and having a shiftable planetary transmission which transmits the rotational movement from the electric motor to the belt shaft, having a planet carrier, and having a plurality of externally toothed planet gears which are mounted rotatably on the planet carrier and which, in order to produce a driving rotational connection, engage by means of their toothings in a toothing of a drive gear, which is driven by the electric motor, and, for the production of a driving rotational connection, said planet gears engage in a toothing of an output gear which is in driving rotational connection with the belt shaft.