Patent ID: 6814365
Filing Date: 2004-11-09
Classification: B62M

Abstract:
A chainless transmission and speed adjustment mechanism of a bicycle, comprising:a front gear set in communication with pedals of said bicycle, a rear gear set with a speed adjustment mechanism disposed thereon; wherein said front gear set comprises a driving gear driven by pedals of said bicycle and a driven gear engaged with said driving gear, said driving gear being a bevel gear or a face gear, said driven gear being a corresponding bevel gear or cylindrical gear, an output end of said driven gear is connected to said rear gear set via a transmission member, said transmission member being a flexible transmission member or a rigid transmission member, axes of said driving gear and said driven gear being positioned on different planes, said rear gear set includes a driven gear disposed in a housing and with said speed adjustment mechanism disposed outside said housing and in communication with an interior of said housing, an input end of said speed adjustment mechanism being connected to an output end of said driven gear of said front gear set, an output end of the speed adjustment mechanism being connected to said driven gear of said rear gear set, a transmission device is disposed in said speed adjustment mechanism, said transmission device including two driven shafts, with a driving wheel disposed on a first one of said driven shafts, said driving wheel being engaged with a driven wheel disposed on a second one of said driven shafts, one end of said second one of said driven shafts being provided with a transmission gear engaged with said driven gear of said rear gear set, said driving wheel and said driven wheel of said transmission device having a predetermined rotational speed ratio, an axis of said driving gear of the rear gear set and an axis of said transmission gear of said speed adjustment mechanism being positioned in different planes.