Daewoo D1146, Maintenance Manual

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D1146/D1146TI/DE08TIS
MAINTENANCE MANUAL
125
Printed in Jan. 2001 PS-MMA0415-E1A
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.