Gear-shifting bicycle

• Main Author: ZHANG RUNHAI
• Format: Patent
• Language: Chinese; English
• Published: 28.10.2009
• Subjects: CYCLES; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; PERFORMING OPERATIONS; POWERED PROPULSION OF SLEDGES OR; RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES; TRANSPORTING

The utility model relates to a bicycle, in particular to a gear-shifting bicycle which comprises a middle shaft and a wheel disc. The middle shaft is fixed above a middle shaft bicycle frame by a bracket, and an upper middle shaft is arranged in a parallel manner. A movable shifting fork is fixed on an outer sleeve of the upper middle shaft, a movable gear is arranged at the left end of the upper middle shaft, and a fixed gear is arranged at the right end. A large gear which is fixed with the middle shaft is arranged at the left end of the middle shaft, the large gear is meshed with the movable gear at the left end, a rolling gear is sheathed on the middle shaft at the right end of the middle shaft, and the rolling gear is meshed with a right gear. The wheel disc is connected with a rear shaft chain wheel by a chain and is fixed on the rolling gear. The gear-shifting bicycle does not change a transmission mechanism of the original bicycle, and the transmission mechanism is composed of the middle shaft, the wh