Passive Weight Lift Assistive System for Hydraulic Trucks by Venkat S Arya - HTML preview

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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.