Patent attributes
An electronic rear derailleur includes a driving unit, a gearbox, a base portion, and a derailleur portion. The gearbox includes a biasing member, a first power gear, a second power gear, a first passive gear, and a second passive gear. The first power gear connects with the driving unit. Force is transmitted from the first power gear to the second power gear through the biasing member. The second power gear meshes the first passive gear and the second passive gear. The first passive gear and the second passive gear are respectively used to allow relative rotation between the gearbox and the derailleur portion with respect to the base portion, whereby the chain of a bicycle can be moved to engage with different sprockets to achieve the purpose of shifting.
