4.4.3 Functions
1) Turbine
Exhaust gas discharged from the combustion chamber distributes its own energy to the turbine blades
while passing the inside of the turbine housing, with the result that the turbine shaft can get rotating
force. This is the operating principle of ‗turbine‘, which is mounted with seal rings and heat protector to
prevent exhaust gas from affecting the bearings adversely.
2) Compressor
The compressor, which is connected to the turbine over the one and same shaft to form a rotating body,
takes in and compresses ambient air with rotating force transmitted from the turbine shaft. Then, the
compressed air is delivered to the intake stake. This is the operating principle of the compressor.
3) Bearings
(1) Thrust bearing
The turbine wheel creates thrust force. Therefore, exercise care so that the shaft is not deviated from
its the original position due to this thrust.
(2) Journal bearing
This journal bearing of floating type forms a dual oil film on both the inside and outside of the bearing
so that the bearing can rotate independently. As the dual oil film plays a role as a damper, the sliding
speed of the bearing surface becomes lower than the rotating speed of the shaft, resulting in
assurance of stability in its movement.
4) Sealing-Compressor shaft
The compressor is of a dual construction type composed of seal plate and seal ring to prevent the
leak of compressed air or lubricating oil.
5ton Diesel Engine SPC000006
Page 113
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