Design and Fabrication of Magnet and Spring Suspension in Bicycle- Mechanical Project.

Abstract
This project deals with the new form of suspension system. This is developed to solve the three problems in existing suspension system. i.e.(life, smooth driving, avoid damage of chassis). The project adding magnetic repulsion method to improve the smooth driving of automobiles. It can be thought of us a spring suspension followed by a magnetic repulsion. The ordinary suspension system is coupled with magnetic repulsion to add more comfortable ride to the rider. Whenever the vehicle undergoes any bumps or imperfection in the road, first the spring compress, the spring is in turn connected with a set of magnet repulsion assembly .The additional magnetic repulsion system provides smooth driving of automobiles both in slow speed, high speed, and all imperfections in road. When the vehicle moving in slow speed it provides suspension in spring movement and magnetic repulsion, but in higher speed the vehicle undergoes any imperfection in road spring compress to maximum extent but the magnetic repulsion system does not compress to that extent. The magnetic repulsion can behave according to the types of imperfection it experience during riding. we done this project in bicycle

INTRODUCTION
The modern motorcycle uses suspension to accomplish several things; it provides a smooth comfortable ride absorbing bumps and imperfections in the road. It also allows the rider to fine tune the machine to give him/her better control over the machine when riding.Whenever the vehicle undergoes any bumps or imperfection in the road, the shock is transferred directly to the vehicle suspension system.
The shock is a vector quantity it have both magnitude and direction, the direction of the shock is perpendicular to the road surface. The magnitude of the shock is directly proportional to speed, that the vehicle hits the bumpsIn such a situation, due to the magnitude of shock the wheels can lose contact with the road completely. Then, under the downward force of gravity, the wheels can slam back into the road surface. when we decrease the stiffness of the spring below to minimum value, the magnitude of the shock is maximum there is possible for damage of chassis or other parts of the automobile .In existing condition, whenever the vehicle hits any bumps or imperfection in the obtained shock is transmitted to the conventional system and the spring or conventional system moves up.

Suspension:
Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two. Suspension systems serve a dual purpose contributing to the vehicle’s road holding/handling and braking for good active safety and driving pleasure, and keeping vehicle occupants comfortable and reasonably well isolated from road noise, bumps, and vibrations, etc.

Design and Fabrication of Magnet and Spring Suspension in Bicycle

Bicycle Suspension
Bicycle suspension is the system, or systems, used to suspend the rider and bicycle in order to insulate them from the roughness of the terrain. Bicycle suspension is used primarily on mountain bikes, but is also common on hybrid bicycles. Bicycle suspension can be implemented in a variety of ways, and any combination thereof:

Front suspension
Rear suspension
Suspension saddle
Suspension stem
Mountain bike suspension technology has made great advances since first appearing in the early 1990s. Early full suspension frames were heavy and tended to bounce up and down while a rider pedaled. This movement was called pedal bob, kickback, or monkey motion and took power out of a rider’s pedal stroke especially during climbs up steep hills. Input from hard braking efforts also negatively affected early full suspension designs.

WORKING PROCEDURE
When the vehicle is driven on the rough surface ,a disturbance in the road causes the wheel to move up and down perpendicular to the wheel surface .According to Newton vehicle undergoes any bumps or imperfection in road, it has both magnitude and direction .The direction is perpendicular to the road surface .The magnitude is equal to the speed that he going to hits the bump. Then the vertical energy is transferred to the spring and Magnetic repulsion setup. Whenever the vehicle undergoes any bumps or imperfection in the road, first the spring compress , the inner side of the spring is connected with a push rod . when spring compress push rod connected inside the spring doesn’t compress, rather it pushes the magnet against the magnet repulsion. Set of magnet repulsion assembly to compress, that make the rider to ride without jerk. The additional magnetic repulsion system provides smooth driving of automobiles both in slow speed, high speed, and all imperfections in road.

Advantages:
It give smooth suspension in both in slow and high speed
Due to good magnetic repulsion setup, it increase the life of the suspension setup
Due to strong repulsion force, it avoid damaging of chassis in the automobiles
Low cost