NUEVO SISTEMA DE TRANSMISION DE BICICLETA MOVIDA POR PALANCAS

Abstract

We present the design of a new transmission system for a bike that transforms its alternative movement of a lever in a rotating movement. This system is also compared with regard to a conventional bicycle. The transmission in a conventional bicycle is very simple, because it is just a pair of discs linked by a chain. By the pedals, the linked disc turns, which, through the chain moves the back disc, which turns its wheel. Throughout this process, the so-called Bobbing phenomenon occurs: there is a moment in which the pedaling is not giving power to the transmission, is the so-called deadlock of the transmission. At this point the rear wheel does not receive movement in a continuous basis, and that is because the force applied on the pedal passes through the axis of rotation of the pedals. At that time, which occurs when the pedals are set out on the same vertical axis, the force applied multiplied by the distance perpendicular to the axis of rotation mean that the transmitted power is null. We have studied a number of proposals that give solution to the problem and made a comparative study of all the alternatives. Finally, we have chosen the one that offers the best results. The work includes the completion of a simulation of its behaviour and an economic study. In conclusion, it is shown that the new mechanism design meets all the objectives set at the beginning. Keywords: Bicycle, transmission, system, levers, movement