Repair manual

Figure 27
TURBOCOMPOUND SYSTEM
In a turbocompound system, a second ”power” turbine is mounted in series to the normal engine turbocharger and coupled
to a Voith hy draulic coupling.
The ”power” turbine, via a gear set, transmits energy to the crankshaft obtaining a power increase of approximately 8% without
increasing fuel consumption.
The Voith hydraulic coupling uses engine oil and is required balance and adjust the engine rate variation between power turbine
and crankshaft.
The exhaust gases produced by the combustion are conveyed to the turbocharger turbine; here, they expand and give part of
their energy by operating the turbocharger and compressing the engine intake air: this increases both engine power and torque.
At first turbo outlet, the exhaust gases reach a temperature of approximately 600˚C.
At this point, the exhaust gases are directed to the second ”power” turbine which is c apable of reaching a revolution speed of
approximately 52.000 rpm at the maximum output power (70 kW).
Also in this case, the exhaust gases give part of their energy and by expanding their temperature drops to abou t 500˚C. After
the power turbine, the exhaust gases return to the normal exhaust system.
In addition to further abating the temperature of the exhaust gases, this system allows to contain emissions to level Tier 3, without
using other technologies.
Engine intake air
Exhaust gas
110601
TURBOCOMPOUND PRINCIPLE DIAGRAM
1. Turbocharger - 2. Lubrication delivery to Voith coupling - 3 Voith hydraulic co u pling - 4. Lubrication return c ircuit from
Voith coupling - 5. Motion output gear from Voith coupling - 6. Power turbine.
SECTION 1 - GENERAL SPECIFICATIONS
19
F3C CURSOR ENGINES
Print P2D32C005 E Base - May 2007