1. ME 2356 DESIGN AND
FABRICATION
PROJECT
R. GOGUL 960511114016
S. VENKATESH 960511114051

2. PASSIVE WEIGHT LIFT ASSISTIVE SYSTEM
FOR HYDRAULIC TRUCKS
 OBJECTIVES
1. To reduce the work done by hydraulic sytem in the weight
lifting mechanism of tipper trucks, thereby increasing the
efficiency of the vehicle.
2. To utilise the application of compressed air in weight lifting
applications to make it more simple and economical.

3. INTRODUCTION
 With increased requirements providing a proper
and efficient weight lifter system in a tipper truck is
a major issue for automobile companies.
 Efficiency of the hydraulic lifting system gets
reduced due to the self weight of the trailer.
 In this project, we made a simple and economical
solution to the above mentioned problem with the
applications of pneumatic springs.

4. LITERATURE SURVEY
 [1] Albert F Rockwell (1910) – Pneumatic spring
1. A vehicle spring comprising a plurality of independently
mounted cylinders and valves for maintaining a uniform
pressure in the cylinders and the source of fluid pressure
supply, substantially as described.
2. A vehicle spring comprising a plurality of independent
mounted cylinders and pistons arranged for reverse
operation one of said cylinders and pistons operating in one
direction being of greater power than the combined cylinders
and pistons operating in the opposite direction, substantially
as described.

5. 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 can be compensated with the help
of a pneumatic spring.
 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.

6. PNEUMATIC SPRING
IT IS A TYPE OF SPRING THAT OPERATES
USING PRESSURIZED GAS SUCH AS AIR OR NITROGEN.

7. FABRICATION PROCESS
 Due to cost considerations, we had done a small miniature of
the idea which represents the working principle of the whole
project.
 Here we purchased steel bars of equal specifications and a
pair of pneumatic springs.
 The steel bars are fabricated to form two rectangular frames
which are connected together through a hinged joint.
 Two pneumatic springs are fabricated on both sides of the
frame at compressed state.

8. EXPERIMENTAL SETUP

9. EXPERIMENTAL SETUP

10. EXPERIMENTAL SETUP

11. WORKING
 Air well known a compressible medium is used to store the
potential energy from the self weight of the trailer.
 Once when thus stored potential energy is released it acts as
the passive weight lifter.
 Thus the power inlet to the hydraulic drive is considerably
reduced say 1/2tonnnes.
 The designed pneumatic weight lifter is fabricated in such way
that it can self lock in any position left by the conventional
hydraulic weight lifter.
 Hence there is no fear of automated lift up of the trailer
irrespective of the operator’s commands.

12. REFERENCES
 Albert Rockwell, F. (1910) ‘Pneumatic Spring’ - United
states patent office company/ US 962246 A.
 Randall Falk, G. (2003) ‘Motor front wheel suspension
system having pneumatic springs’ - United states patent
office company/ US 6533305 B1.
 Bachrach, B.I. (1981) ‘Analysis of damped pneumatic
pneumatic spring’ – Journal of Sound and Vibration.
 Kent Fulks (1993) ‘Compact weight lifting machine’ -
United states patent office company/ US 5540530 A.

13. THANK YOU

14. A
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