DE08TS Diesel Engines Maintenance of Major Components
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 hous-
ing, 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 pre-
vent 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 com-
pressor.
3. Bearings
a. 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.
b. 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.
c. Sealing-Compressor shaft
The compressor is of a dual construction type com-
posed of seal plate and seal ring to prevent the leak
of compressed air or lubricating oil.
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