BICYCLE WITH CHAINLESS BILATERALLY MULTISHAFT DRIVE MECHANISM AND ROBUST REAR WHEEL SUPPORT MECHANISM

摘要

This patent discloses chainless shaft driven bicycle which do not use bevel-pinion mechanism for manual force transmission. Instead drive mechanism uses multiple crankshafts on the front part, each having different center of rotation, coupled with a crankshaft on the rear part to rotate rear wheel. Drive mechanism consists of pair of drive assemblies located on two sides of the front part bicycle. Each drive assembly consists of a special type of gear in which plurality of suitably modified planetary gears and a gear ring are arranged in such a way that gear ring can be rotated via pedal which in turn rotates planetary gears along its direction of rotation. Planetary gears are modified to function as crankshaft by journalling metal pegs on its base circle. Larger radius of the gear ring than planetary gears accounts for gear ratio. Drive mechanism doesnt come in contact with clothing of the rider. Seat stay tube is replaced by robust rear wheel support mechanism comprising rear bracket (RB) and rear bracket support (RBS). Rear bracket comprises pair of planar trusses having special form to facilitate better bicycle kinematics.