Patent ID: 8448736

Claim:
A bicycle deriving driving force by a motor-generator having a rotating plate ( 10 ) of a nonmagnetic material having a plurality of radially fixed magnets ( 11 , 11 ′), fixed plates ( 20 , 20 ′) of a nonmagnetic material which are placed on both sides of the rotating plate ( 10 ) and have a plurality of horizontally wound coil units ( 21 , 21 ′) corresponding to the magnets ( 11 , 11 ′), and a rotating axis ( 12 ) which is mounted on a center of the rotating plate ( 10 ) and at both ends of which are fixed the plates ( 20 , 20 ′) through the bearings, the bicycle comprising: a motor-generator ( 30 ) which is mounted on a side of a rear wheel of the bicycle ( 50 ); a power transmission means including a driving pulley ( 53 ) which is fixed on a shaft ( 52 ) where the rear wheel ( 51 ) of the bicycle ( 50 ) is rotatably mounted, a driven pulley ( 13 ) which is mounted on one end of the rotating axis ( 12 ) mounted on the center of the rotating plate ( 10 ), a belt ( 54 ) which operatively connects the driving pulley ( 53 ) and the driven pulley ( 13 ); a control box ( 60 ) and a battery ( 70 ) which are mounted on the bicycle ( 50 ) and are connected with the coil units ( 21 , 21 ′); a change-over switch ( 56 ) which is mounted on the handle ( 55 ) of the bicycle ( 50 ) and converts the motor-generator in such a way that it can be used selectively as a generator or a motor, and a bend shaped support ( 80 ) includes a lower end and an upper end, the lower end is fixed on the shaft ( 52 ) and the upper end is fixed to the bicycle ( 50 ), and the fixed plate ( 20 ) is joined to the support ( 80 ), wherein the coil units ( 21 , 21 ′) formed on the fixed plate ( 20 , 20 ′) are connected by a variable speed unit ( 66 ) that controls the short-circuit form of the electricity applied to the coil units ( 21 , 21 ′), and the variable speed unit ( 66 ) is controlled and operated by a speed change switch ( 57 ) mounted on the handle ( 55 ) of the bicycle ( 50 ).