Operation Manual / TPL73-B.. - 85-B11/ -B12
1 Preliminary remarks / 1.2 Layout and function
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HZTL2480_EN
Revision D
July 2018
Mode of operation
The turbocharger is a turbomachine and consists of the following main
components:
¡
Turbine
¡
Compressor
These are both mounted on a common shaft.
The exhaust gases from the diesel engine flow through the gas inlet cas-
ing (07) and nozzle ring (08) to the turbine wheel.
The turbine wheel (09) uses the energy contained in the exhaust gas to
drive the compressor wheel (12). The compressor then draws in fresh air
and forces precompressed air into the cylinders.
The exhaust gases escape to free air through an exhaust gas pipe which
is connected to the gas outlet casing (06).
The air, which is necessary for operation of the diesel engine and is com-
pressed in the turbocharger, is routed through the filter silencer (01) to
the compressor wheel (12). This air then passes through the diffuser (11)
and leaves the turbocharger through the compressor casing (13).
The rotor runs in two radial plain bearings (02/05). One plain bearing is
in the bearing bush (04), and the second one is in the axial thrust bearing
(03) at the compressor end.
The plain bearings are connected to a central lubricating oil duct which is
fed with oil from the engine's lubricating oil circuit. The oil outlet is al-
ways at the lowest point of the bearing casing (10).
The turbocharger is equipped with an emergency lubrication oil tank
(14). If the main oil lubrication system fails, this emergency lubrication
unit supplies oil to the bearings until the rotor comes to a standstill.
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