Patent ID: 7357209

Claim:
An electromotive power assisted bicycle capable of running by a pedal effort that is assisted with an electric force, said bicycle comprising; a pedal effort detection means for detecting a pedal effort, an auxiliary power means capable of selecting either one of an electric force or a loading force based on the pedal effort detected by said pedal effort detection means and also capable of adding said selected one to the pedal effort so as to yield a pedal effort level enabling an aerobic exercise, and a force combining means for combining said electromotive power or said loading force which has been selectively output by said auxiliary power means with said pedal effort, the force combining means comprising a secondary sprocket capable of rotating coaxially with a primary sprocket, a power sprocket to be rotated by said auxiliary power means, and an assist chain stretched between said secondary sprocket and said power sprocket, wherein said auxiliary power means includes an electric motor; and an electromagnetic clutch is provided between said electric motor and said force combining means, and wherein said loading force is provided as a rotational resistance of said electric motor, which is generated by connecting said electric motor with said force combining means by said electromagnetic clutch under a condition where said electric motor is not supplied with an electric power.