P09.40-2287-11
24 Turbocharger
Y100/1 Right boost pressure positioner
Location
The turbocharger is located on the right at the exhaust manifold flange.
Task
The turbocharger compresses the intake air, whereby the degree of filling of the cylinder increases and thus the engine torque increases.
P09.40-2247-71
24/2 Adjusting ring
24/4 Guide vane carrier
24/5 Return spring element
24/7 Guide vane
24/9 Turbine housing insert
24/10 Spacer bridge
P09.40-2248-71
Design
In contrast to its predecessor (Step 2) the turbocharger (Step 3) has a turbine housing insert. This Turbine housing insert consists of the following components:
Turbine wheel
Return spring element
Guide vane carrier
Guide vane
Adjusting ring
The installation space required for the guide vanes is achieved from a design point of view through the use of integral, aerodynamically optimized spacer bridges. The guide vane carrier and the return spring element are screwed to the turbine housing and are therefore decoupled thermally. This has the advantage that the guide vane support and the return spring element can adapt to the respective thermal conditions without restriction during thermal expansion. The return spring element serves to receive the guide vane carrier.
-----------------------------------------------------------------------------------------
Function
The exhaust gases of the engine are directed through the exhaust manifold into the turbine housing onto the turbine wheel. The flow energy of the exhaust gases sets the turbine wheel in rotation. This means that the compressor turbine wheel which is also connected to the supercharger shaft is driven at the same speed. The sucked in fresh air from the compressor turbine wheel is compacted, led through the charge air cooler and then led to the engine. The boost pressure is regulated by adjusting the guide vanes, that is by altering the flow angle of the guide vanes. The pilot studs on the control linkage of the right boost pressure positioner turn the respective adjusting ring in the turbine housing insert. As the pilot studs of the guide vanes also latch into the adjusting ring, all guide vanes are thus adjusted simultaneously. At a low motor speed the flow cross-section is downsized by "closing" the guide vanes.
-----------------------------------------------------------------------------------------
In this way the air flow velocity of the exhaust on the turbine wheel is increased whereby its rpm and thus also the rpm of the compressor turbine wheel increases and thus the boost pressure increases. At a high motor speed the flow cross-section is increased by "opening" the guide vanes. In this way the air flow velocity of the exhaust on the turbine wheel is decreased whereby its rpm and thus also the rpm of the compressor turbine wheel decreases and thus the boost pressure decreases.
The turbine geometry of the turbocharger is adjusted by the right boost pressure positioner.