Patent ID: 9334017
Filing Date: 2016-05-10
CPC Classification: B62M

Claim Text:
1. An electronic rear derailleur, installed on a bicycle for guiding a bicycle chain, comprising: a fixing part, having a first joint and a fixing end connected with the bicycle; a drive element, driving a drive wheel to rotate; a transmission assembly, having a transmission shaft and a transmission element, the transmission shaft being disposed with a driven wheel and a threaded section, the driven wheel being rotated by the drive wheel, the transmission element having a threaded hole and a drive portion, and the transmission element being threaded with the threaded section through the threaded hole so as to be moved back and forth corresponding to the transmission shaft; a linkage unit, including a base, a revolving wheel, and a gear set, the base having a first end and a second end, the first end being pivotally connected with the first joint and rotated about the first joint as an axle, the revolving wheel being engaged with the drive portion, the gear set being disposed in the base, and the gear set being engaged with the revolving wheel and rotated by the revolving wheel; and a chain adjusting portion, having a second joint and pivotally connected to the second end, so that the chain adjusting portion rotates relative to the base; wherein the gear set is respectively connected with the first joint and the second joint so as to make the first joint and the second joint synchronizely rotate and then drive the base to rotate, so that the chain adjusting portion shift the bicycle chain.