Essay On Torsion Motion

DESIGN AND FABRICATION OF TORSIONAL BICYCLE

ABSTRACT

A torsional bicycle is a bicycle that works on the mechanism of torsional motion instead of conventional mechanism that is being used in normal bicycles. Torsion spring is used in this bicycle which produces reciprocating motion in the pedalling. Bicycle uses a freewheel and a roller chain which are meshed together that gives torsional motion due to the spring fixture resulting in the torsion motion of pedalling. An Aluminium plate is used for supporting the components used and also provides the space for torsion spring setting. This plate acts as a crank arm for the cycle since it is mounted from rear wheel in order to support the freewheel and torsion spring. The crank arm which is made of aluminium sheet of 10mm thickness and 660mm long undergoes the reciprocating motion when the force is applied on the pedal as the arm is connected to footrest. The change in motion of pedalling gives out more smoothness and easy movement of bicycle as the force to be applied is less when it is compared to conventional bicycles.

Keywords: Torsion spring, freewheel, Crank arm, Cycle.

?

INTRODUCTION

Bicycles were introduced over two centuries ago and as of now 500 million

The ends of torsion springs are attached to other components, and when those components rotate around the centre of the spring, the spring tries to push them back to their original position. Although the name implies otherwise, torsion springs are subjected to bending stress rather than torsional stress. They can store and release angular energy or statically hold a mechanism in place by deflecting the legs about the body centreline axis. The coils of a torsion spring are usually close wound with minimal tension between the coils, but they can also be made open wound to reduce friction or to create a spring that functions as both a torsion spring and a compression