DESIGN OF FOUR BAR CHAINLESS BICYCLE -ANTHROPROMETRIC AND KINEMATIC ANALYSIS

This paper is developed for the users to rotate the back wheel of a two wheeler by replacing traditional sprocket wheel mechanism with new planar four-bar linkages in the transmission system of bicycle, based on the lever. Usually in two wheelers, chain and sprocket method is used to drive the back wheel. This concept is explored for improving of the driving technique of bicycle. The Primary advantages are considerably improved driving efficiency, simplified drive wheel change out, a simple frame design and zero maintenance on any drive component. The improved driving efficiency is mainly due to the replacement of the drive chain, with a Four bar mechanism. Added advantages of this new mechanism is that all components are fully enclosed and thus don't have the potential of staining and jamming clothes as it is the case with conventional, exposed, grease lubricated chain drives. Due to its small motion range, the new mechanism can be applied in both the traditional bicycle, special for the handicapped and in the design of the vehicles.