Rear derailleur for bicycle has driven shaft to drive outer linking portion to move the movable element relative to the base element and drive inner linking portion according to the movement of the outer linking portion

摘要

The rear derailleur (12) has a movable element (20) that is movably coupled to a base element (18). An outer linking portion (60) of multi-joint (22) is pivotally connected to base and movable elements in respective pivot axes (P). An inner linking portion is pivotally connected to base and movable elements. A driven shaft (64) of motor unit (24) is set in parallel to the pivot axes. The driven shaft is operated to drive outer linking portion to move the movable element relative to the base element and drive inner linking portion according to the movement of the outer linking portion.