Electric assisted bicycle

摘要

An electric assisted bicycle of simple structure is provided which is superior in the stability, reliability, and certainty of operation, and is provided with an electric power regenerative function and a brake assist function. A pedal force transmitted from a crank shaft (101) is transmitted to an axle shaft (106) via first transmission means (115a), and the output of a motor (114) as an assistant motive power is transmitted to the axle shaft (106) via a clutch unit (1), which can switch a lock direction in conjunction with brake operation by a cyclist, and second transmission means (115b).