| 摘要 |
<p>An electrically assisted bicycle which enables an aerobic exercise with a compact, lightweight, and simple mechanism. An electrically assisted bicycle (1) comprises stepping-power sensing means (99, 126) for sensing the stepping power, a drive unit (13), a resultant force mechanism for transmitting the torque of a decelerating section to a drive shaft, and a heartbeat sensor (254). The drive unit (13) comprises an electric motor (37) and a decelerating section (35) having an electromagnetic clutch (250). In a mode in which an aerobic exercise is possible, when the sensed stepping power is higher than a stepping-power level enabling aerobic exercise, the drive unit (13) drives the electric motor (37) with the electromagnetic clutch (250) engaged and thus assists the stepping power by the motor power. When the sensed stepping power is lower than the stepping-power level, this unit (13) switches the electric motor (37) off with the electromagnetic clutch (250) engaged and thus adds a load power to the stepping power by a motor rotational resistance. The stepping-power level is adjusted according to the sensed heartbeat of the rider.</p> |
