Patent ID: 6080073
Filing Date: 2000-06-27
Classification: B62M

Abstract:
An electric auxiliary apparatus for a bicycle, comprising:an electric motor for providing auxiliary power;a crankshaft operatively connected to the electric motor;a first elastic member seat disposed on the crankshaft and driven by an input end of the electric motor;a first chain-wheel seat disposed on the crankshaft;a first elastic member connecting the first elastic member seat to the first chain-wheel seat;an input member for receiving a connected pedal force;a second elastic member seat disposed on the crankshaft and interlocked with the first chain-wheel seat;a second chain-wheel seat disposed on the crankshaft and interlocked with the first chain-wheel seat; andsecond elastic member connecting the second elastic member seat with the second chain-wheel seat;a gear reduction mechanism for reducing a speed of the auxiliary power from the electric motor and increasing an output torque thereof;a power combination mechanism for combining the pedal force with the electric motor power to drive the bicycle, the power combination mechanism having said first elastic member connected to the electric motor and said second elastic member connected to the input member; anda pedal force sensing mechanism for detecting the magnitude of the pedal force to control the magnitude of the auxiliary power of the electric motor;the pedal force sensing mechanism comprising:at least one magnet located on the second chain-wheel seat; andat least one magnetizable member located on the second elastic member seat;wherein when the second elastic member deforms, the relative force between the magnet and the magnetizable member changes, thereby causing the second chain-wheel seat to slide along an axle of the crankshaft.