• Mr. D. Prabu, Mr. A. Giriprasath, Mr. S. Gugan


In recent days chain drive mechanism is used in bicycle. In our project we are going to change this mechanism with a revolutionary mechanism i.e. Shaft drive mechanism  using Bevel gear. A shaft- driven bicycle is a bicycle that uses a drive shaft instead of a chain to transmit power from the pedals to the wheel. The invention is to provide a chainless transmission mechanism comprising a first shaft connected to a pedal of the bicycle, a first bevel gear connected to the first shaft; a second shaft perpendicular to the first shaft, two ends of which are connected to a second bevel gear and a third bevel gear, respectively, the second bevel gear being matched with the first bevel gear to drive the second shaft, a fourth bevel gear mounted on an axle of a rear-wheel hub of the bicycle to engage with the third bevel gear, a ratchet clutch connected between the rear- wheel bub and the axle; and a connection member connected between the fourth bevel gear and the rear-wheel hub.

A bicycle with the chainless transmission mechanism of the invention is of a simple manufacturing process and a lower cost. Shaft-drive systems are fully enclosed and are unaffected by the weather and only need periodic oil changes. The major benefits of shaft-drive are lower maintenance and running costs, and cleanliness. A Chain-drive bike needs their chains adjusting regularly and they can be expensive to replace when they wear out. The Shaft-drive allows avoid the problem of chain falling-off and allows safer use.