Installed in diesel engines D-260.1S3
А, D-260.2S3А is an uncontrollable turbocharger
(Fig.17
а) using the energy of exhaust gases for charging air into the engine cylinders.
Turbocharger operation principle is as follows: the eaxhaust gases from the diesel en-
gine cylinders get under pressure via the exhaust manifold into the turbine scroll chan-
nels. While expanding, the gases rotate the turbine wheel with a shaft on the other end of
which a compressor wheel, via the air cleaner, sucks air in and delivers it under pressure
into the diesel engine cylinders.
Turbocharger, according to Fig.10, is made on the principle: radial centrifugal turbine
and centrifugal single-stage compressor with overhanging location of wheels relative to
the supports.
The rotor speed, the charge air flow and pressure depend on the engine operation mode.
1 – turbine wheel with shaft; 2 – turbine housing; 3 - monobush; 4 – oil deflector;
5 – eccentric ring; 6 – compressor wheel; 7 – special nut; 8, 15 –sealing rings; 9 - diffuser; 10 - cover;
11 – compressor housing; 12 – thrust bearing; 13 – space bush; 14 – middle housing (bearings housing).
Fig. 17
а – Uncontrolable turbocharger
The housing of turbine 2 is made of high-strength cast iron. The turbine flow-through
part for exhaust gases is fromed by the turbine housing and the turbine wheel.
Compressor housing 11 is made of alluminium alloy, its flow-through part is formed by
the compressor housing and compressor wheel.
The turbine and compressor housings are fixed to bearings housing 14 made of high-
strength cast iron.
Turbine whell 1 is cast of heat-proof alloy and welded to the rotor shaft.
Compressor wheel 6 is cast of alluminium alloy and is fixed to the rotor shaft with a spe-
cial nut.
The rotor shaft rotates in a radial bearing made as a floating non-rotating monobush 3.
The monobush is secured in the bearings housing by a fixer. The rotor axial motion is
taken by thrust bearing 12.