ABB HT564586 Operation Manual page 37

Operation Manual / 4 Product description / A100-L
1 Introduction Page 7 / 111
Mode of operation
The turbocharger is a turbomachine and consists of the following main components:
 Turbine
 Compressor
These components are installed on a common shaft and form the rotor (see Figure 1).
The exhaust gases of the internal combustion engine flow through the gas inlet casing (08)
and the nozzle ring (07) onto the turbine wheel (06). The turbine wheel uses the energy con-
tained in the exhaust gas to drive the rotor and, hence, the compressor wheel (11).
The exhaust gases then reach the atmosphere through the exhaust gas pipe connected to the
gas outlet casing (05).
The compressor wheel (11) sucks in fresh air and presses the compressed air into the cylinder.
The air passes through the filter silencer (01) to the compressor wheel (11). The air then flows
through the diffuser (10) and exits the turbocharger through the compressor casing (12). An
air outlet silencer (13) is optionally available. If installed, this will reduce the amount of noise
generated by the components at the outlet side after the compressor casing.
The rotor runs in two radial plain bearings (03/04) which are located in the bearing casing (09)
between the compressor and turbine. The axial thrust bearing (02) is located on the compres-
sor end.
The plain bearings are connected to a central lubricating oil duct which is normally supplied by
the lubricating oil circuit of the engine. The oil outlet always lies at the deepest point of the
bearing casing (09).
The turbocharger is equipped with an oil tank which is integrated in the bearing casing (9).
This oil tank supplies the bearings of the rotor with oil until standstill in the event that a mal-
function of the lubrication oil system causes an emergency stop of the engine.
© Copyright 2016 ABB. All rights reserved. HZTL4034_EN Revision F June 2016