Design of a Powertrain System for Simple Vehicle

This report is about the study to design a suitable powertrain system for a simple
vehicle. The goal for the vehicle is to achieve a good range of gear ratio base on
angnlar speed of each sprocket in order to obtain the best powertrain design and
improve the vehicle movement. For the simple vehicle, the power developed by
engine is transmitted to the rear wheel by 4 sets of different sizes of sprockets. The
first sprocket is at the output of the engine is 9.4 5mm in radius transmits the power to
the second sprocket which is 69mm in radius. The power transmitted along a gear
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reduction to third sprocket which is 29mm in radius and lastly to the fourth
sprocket/rear sprocket which has a radius of 11 Omm. The second sprocket is varied
in radius start from 39mm, 49mm, 59mm, and 69mm. The best result from the
ADAMS analysis is 39mm in radius which contribute to 7.9:1 gear ratio. Honda
GX160 engine is efficient in power delivery but suffers unfortl.mate increase in
weight compares to previous project which uses Honda GX35 engine. Based from
this change, the design of the drivetrain must be simple and use the lightest material
as possible with a good efficiency in order to reduce the overall weight. The
objective of this project is to develop the best design selection of powertrain based
on each part of powertrain including chain, clutch, sprocket, and transmission that
builds to an efficient powertrain that suits perfectly with the engine and study on the
other existing system of drivetrain mechanism, design, structure, and material use for
the vehicle.