Electric derailleur motor unit

A motorized derailleur assembly comprising:

• a derailleur motor having a driving shaft;
• a drive train including at least one intermediate gear operatively coupled to the driving shaft of the derailleur motor and a worm gear operatively coupled to the intermediate gear such that rotation of the driving shaft of the derailleur motor rotates the intermediate gear which in turn rotates the worm gear;
• a derailleur motor support structure supporting the derailleur motor and the drive train;
• a fixing body coupled to the derailleur motor support structure;
• a bicycle frame mounting portion coupled to the derailleur motor support structure;
• an output shaft having a first axial end and a second axial end, with the output shaft being rotatably supported at a center portion of the output shaft between the first and second axial ends by the derailleur motor support structure, the output shaft having an output gear engaged with the worm gear of the drive train;
• an eccentric drive pin offset from a rotational axis of the output shaft and mounted to the output shaft at a location between the center portion and one of the first and second axial ends;
• a motor linkage operatively coupled to the output shaft, the motor linkage including a drive link with the eccentric drive pin being rotatably received in a drive hole of the drive link to move the drive hole around the rotational axis of the output shaft when the output shaft rotates;
• a chain guide movably coupled to the fixing body, the motor linkage being arranged to move the chain guide between a first shift position and a second shift position in response to movement of the output shaft;
• and
• a derailleur linkage operatively coupling the chain guide to the fixing body, the derailleur linkage being separate and spaced from the motor linkage.