Bicycle with assist motor

摘要

To provide a bicycle with an assist motor, which is capable of realizing a reasonable layout of a power transmission mechanism for transmitting a torque from an assist motor to a chain. A chain (12) for transmitting a rotation of a crank shaft sprocket (10) provided at a right end of a crank shaft (7) to a rear wheel is disposed on the right side of a vehicular body. An assist motor (13) with an output shaft (36) disposed in parallel to the crank shaft (7) is connected to the crank shaft sprocket (10) via a power transmission mechanism (D) composed of a primary gear (43), first to fourth intermediate gears (44, 45, 47 and 48), and a final gear (49). The power transmission mechanism (D) is positioned on the left side of a rotational plane of the chain (12), so that it is possible to realize a compact layout of the power transmission mechanism (D) without interference with the chain (12). <IMAGE>