Patent ID: 7370873

Claim:
A bicycle drive unit of multiple pedaling modes, comprising: a drive shaft (S 1 ) on one side having inner wheels of a counterclockwise one-way clutch (B) and a clockwise one-way clutch (A) coupled thereto by means of sunk keys 2 , and engaged with a ring gear 9 having an outer circumference attached to a chain sprocket 10 and an inner circumference having gears of a saw tooth shape formed therein, wherein an inner wheel of a central gear 3 is cold press-fitted to an outer wheel of the counterclockwise one-way clutch (B); a plurality of hollow turnabout gears 6 engaged with the central gear 3 of the drive shaft (S 1 ); a drive shaft S 2 on the other side having one side rotatably inserted into an inner bearing housing H 1 that is integrally formed with the rotary plate 1 and the other side coupled to the inner wheel of the clockwise one-way clutch (A) and the counterclockwise one-way clutch (B) by means of the sunk keys 2 , wherein the inner wheel of the central gear 3 is cold press-fitted and coupled to the outer wheel of the clockwise one-way clutch (A), and the drive shaft S 2 is engaged with the ring gear 9 having the outer circumference attached to the chain sprocket 10 and the inner circumference having gears of a saw tooth shape formed therein; and a plurality of turnabout gears 4 , a two-way turnabout gear 5 and a hollow turnabout gear 6 all of which are coupled to the rotary plate 1 and engaged with the central gear 3 of the drive shaft S 2 .