Maintenance of Major Components
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5.4.3. Summary
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The engine output depends upon the supplied fuel quantity and the engine efficiency. In order to
transform into the effective work of engine by burning the supplied fuel fully, the sufficient air to burn
the fuel should be supplied to the cylinder. Therefore, the engine output is essentially determined by
the size of the cylinder, and for if the air is supplied to the given volume of cylinder with the air being
compressed, the air quantity in the cylinder will Increase as much to result in that it may burn more
fuel. the output will also be able to increase, Supplying the air by compressing like this into the
engine cylinder is called as super charging, and super charging by means of exhaust gas energy that
discharges to the atmosphere is called as the turbo charging.
5.4.4. Function
1) Turbine
The exhaust gas that is discharged from combustion chamber passes through turbine housing
conveying an energy to turbine wings to give the rotating power, This is called as the turbine and in
order not to influence a bad effect at bearing part, there are the seal ring and heat dissipator.
2) Compressor
It is connected to the same shaft with the turbine to make a revolving assembly, and receive the
revolving force of turbine, and sends air to the suction manifold by suctioning and compressing it.
This is called as the compressor.
3) Bearing
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Thrust bearing force is applied to the turbine wheel and an arrangement is made for the shaft not
to shift.
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Journal bearing (floating bearing) is adopted and it forms the double oil films at the in out surfaces
in comparison to the general stationary type so that the bearing may be able to rotate
independently and consequently the double layers of films act as the damper to make the slipping
speed on the bearing surface less than the rotating speed of shaft so that the dynamic stability
may be obtained.
4) Sealing at compressor shaft
In order for the compressed intake air and lubricating oil not to leak, a seal plate and a seal ring are
made to the double structures.
EFM3002I
Turbine wheel
Compressor wheel
Compressor air supply
Exhaust
Exhaust gas inlet
Outlet
EFM3003I
Turbine
Intake air
inlet
Compressor air passage
Compressor
Exhaust gas passage
Exhaust
gas
outlet
Engine
cylinder
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