Open/close member driving apparatus

An open/close member driving apparatus comprising:

• a motor;
• a transmission member for transmitting a driving force of the motor to an open/close member;
• a speed reduction mechanism;
• a base member;
• a field core that comprises an electromagnetic coil and is fixed to the base member;
• a shaft with a first end portion and a second end portion;
• a rotor that is rotatably fitted on an outer circumference of the shaft and passes through a central portion of the field core to be connected to the speed reduction mechanism, the shaft extending along an axis of rotation of the rotor and passing through the rotor;
• an armature fitted on the shaft rotatably and movably in an axial direction of the shaft and comprises an armature side locking portion on an outer circumferential portion thereof, the armature being magnetically attracted to the rotor when the electromagnetic coil is energized;
• and
• an output drum that is integrally formed as one piece with the shaft and is pivotally supported on the base member via the shaft,
• wherein the armature is accommodated inside of the output drum,
• wherein the transmission member is wound onto an outer circumferential surface of the output drum,
• wherein an inner circumferential surface of the output drum comprises a drum side locking portion, the drum side locking portion engaging with the armature side locking portion in a rotational direction such that a rotation of the armature is transmitted to the output drum and the armature is movable in the axial direction of the shaft,
• wherein the shaft is formed integrally in a central portion of an end lid portion of the output drum such that the first end portion of the shaft projects from the end lid portion at a first side and the second end portion of the shaft projects from the end lid portion at a second side.