Belt retractor having an electric motor

A belt retractor, having

• a belt shaft which is rotatably mounted in a frame and around which a safety belt can be wound, the frame being able to be fastened to the vehicle, and
• an electric motor for driving a rotational movement of the belt shaft, and
• a shiftable planetary gearing transmitting the rotational movement from the electric motor to the belt shaft, having
• a planet carrier and a plurality of externally toothed planet gears which are rotatably mounted on the planet carrier and engage via their toothings in a toothing of a drive gear driven by the electric motor to produce a rotary drive connection, and engage in a toothing of an output gear which has a rotary drive connection with the belt shaft to produce a rotary drive connection, wherein
• the planet gears are in toothed engagement with an internal toothing of a first ring gear,
• wherein
• the first ring gear is designed to be rotatable and has a blocking contour, and
• a blocking device which is fixed in place relative to the first ring gear is provided with a first blocking lever which blocks the first ring gear to shift the planetary gearing upon actuation by means of a movement of the first blocking lever into the blocking contour,
• wherein
• the output gear is formed by a second ring gear with an internal toothing, and
• the planet gears are in toothed engagement with the internal toothing of the second ring gear.

A belt retractor, having

• a belt shaft which is rotatably mounted in a frame and around which a safety belt can be wound, the frame being able to be fastened to the vehicle, and
• an electric motor for driving a rotational movement of the belt shaft, and
• a shiftable planetary gearing transmitting the rotational movement from the electric motor to the belt shaft, having
• a planet carrier and a plurality of externally toothed planet gears which are rotatably mounted on the planet carrier and engage via their toothings in a toothing of a drive gear driven by the electric motor to produce a rotary drive connection, and engage in a toothing of an output gear which has a rotary drive connection with the belt shaft to produce a rotary drive connection, wherein
• the planet gears are in toothed engagement with an internal toothing of a first ring gear,
• wherein
• the first ring gear is designed to be rotatable and has a blocking contour, and
• a blocking device which is fixed in place relative to the first ring gear is provided with a first blocking lever which blocks the first ring gear to shift the planetary gearing upon actuation by means of a movement of the first blocking lever into the blocking contour,
• wherein
• the drive gear is formed by a two-stage gear wheel with a drive toothing and an output toothing, wherein the drive gear is in toothed engagement with the planet gears via the output toothing, and is in toothed engagement with a drive gear wheel driven by the electric motor via the drive toothing.

A belt retractor, having

• a belt shaft which is rotatably mounted in a frame and around which a safety belt can be wound, the frame being able to be fastened to the vehicle, and
• an electric motor for driving a rotational movement of the belt shaft, and
• a shiftable planetary gearing transmitting the rotational movement from the electric motor to the belt shaft, having
• a planet carrier and a plurality of externally toothed planet gears which are rotatably mounted on the planet carrier and engage via their toothings in a toothing of a drive gear driven by the electric motor to produce a rotary drive connection, and engage in a toothing of an output gear which has a rotary drive connection with the belt shaft to produce a rotary drive connection, wherein
• the planet gears are in toothed engagement with an internal toothing of a first ring gear,
• wherein
• the first ring gear is designed to be rotatable and has a blocking contour, and
• a blocking device which is fixed in place relative to the first ring gear is provided with a first blocking lever which blocks the first ring gear to shift the planetary gearing upon actuation by means of a movement of the first blocking lever into the blocking contour,
• wherein
• the output gear is formed by a two-stage gear wheel with a drive toothing and an output toothing, wherein the output gear is in toothed engagement with a gear wheel of a gearing driving the belt shaft via the output toothing, and is in toothed engagement with the planet gears via the drive toothing.