3. PROBLEM DEFINITION
• The problem which we taken under consideration in this project was the reduction in efficiency of hydraulic weight lifting system in tipper trucks due to the self weight of the trailer.
• This reduction in efficiency occurs due to the need of a hydraulic motor with high capacity to lift heavy loads. A motor with low capacity can be used when assisting it with a pneumatic spring.
• Thus reduction in efficiency of the automobile is compensated with the help of a pneumatic spring.
• Pneumatic spring is a type of spring that operates using pressurized gas such as air or nitrogen. Automobile shock absorbers sometimes contain pneumatic springs.
• The self weight of the truck trailer is sufficient enough to compress the pneumatic spring and the spring at its compressed form can be easily lifted with less force.
• Thus work done to lift the entire load by conventional hydraulic mechanism gets reduced. This was the background of our project.
• Due to cost considerations, we did a small miniature representing the whole project with two rectangular frames hinged with each other. The outer frame represents the vehicle chassis, while the inner frame represents the trailer.