Note: Descriptions are shown in the official language in which they were submitted.
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This invention relates to the turbocharger system -
for an internal combustion engine. Such systems are shown,
for example, in U.S. Patent 3,796,047 issued to Crook et al.
Turbocharger devices have enjoyed extensive use with inter-
nal combustion engines and are devices which utilize the
energy of the exhaust gases from the engine for the purpose
of compressing ambient air prior to its introduction into
the intake manifold o~ the engine. Such systems may include
intercoolers for the purpose of lowering the temperature of
the compressed air prior to its introduction into the engine.
Intercoolers are used in, for example, the noted Crook
et al patent. Another example of the use of an intercooler
is afforded by U.S. Patent 3,143,103 issued to Zuhn. It
is to be understood that these patents are not intended to
be exhaustive as showing turbochargers or patents as showing
intercoolers. In general, an intercooler is a heat exchange
device having first and second separate hydraulic flow
paths in heat exahange relationship with each other.
In the noted Crook et al patent 3,796,047, a pair
of turbochargers is employed. Each turbocharger is defined ~ -
by a turbine wheel and a compressor wheel or fan mounted on
a common shaft. The output of the first compressor is fed
to a first flow path in an intercooler, with the output
being fed to the turbine of a second turbocharger and the
exhaust therefrom being fed to the in-take manifold of the
engine. The fan of the second turbocharger ser~es to draw
air into the second flow path of the intercooler from ambient.
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According to the practice of this invention, i~ has
been noted that the addition of a second intercooler to a
system such as that shown in the noted Crook et al patent
yields desirable results. Specifically, the addition of a
second intercooler in $hat system produces cooler charged
air for increaséd output power and lower NOX emissions of
the engine.
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The use of air-to-air intercoolers in internal
combustion engine systems is known, the intercoolers general-
ly cooperating with ei~her superchargers (driven by the
engine crankshaft directly)-or with turbochargers. In
general, the result of the use of one or more intercoolers
in such a system is to lower the temperature of the charged
air, i.e., the temperature of the air which enters the intake
manifold.
Referring now to the drawing, the numeral 10 de-
notes generally a first turbocharger~ the turbocharger in-
cluding a turbine wheel 12 and a compressor wheel 14 mounted
on a common shaft for rotation together. The exhaust of the
illustrated in~ernal combustion engine is fed to the intake
of the turbine wheel 12 and causes rotation thereof, thereby
causing rotation of compressor wheel 14. The numeral 16
denotes a second turbochargex, the turbocharger including a
turbine wheel 18 and a fan 20 (instead of a compressor)
mounted on a common shaft for rotation together. The output `
of the compressor wheel 14 is fed to and accordingly drives
the turbine wheel 18. The exhaust from the turbine wheel 18
is fed through hydraulic line 22 to a first flow path in and
through air-to-air intercooler 23. The output from this flow
path is fed through line 24 to a second intercooler denoted
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by the n~neral 26. The second intercooler is positioned in
front of the radiator 28 of the engine, the usual radiator
cooling fan 30 being mounted between the engine block and
the radiator. The output of the second air-to-air inter-
cooler 26 is fed through line 32 to the intake manifold ofthe engine. The second flow path of the first intercooler
23 is defined by line 34, ~he input thereto communicating
with ambient, the line leading to the input of the fan 20.
The output of fan 20 is fed to ambient.
In operation, the energy of the exhaust gases
passing out from the exhaust manifold of the engine is
utilized to turn turbine wheel 12. The output of turbine
wheel 12 is fed to t:he e~haust system of the wheeled vehicle
in which the engine is mounted, such as diesel engine powered
truck, and to any exhaust treating apparatus for eventual
discharge to atmosphere (ambient). The energy from turbine
wheel 12 is used to compress ambient air by means of compres-
sor wheel 14. The air entering turbine wheel 18 is thus at
a higher temperature and higher pressure than that of ambi-
ent. After expansion through turbine wheel 18 t the exhausttherefrom is fed, still at relatively high pressure, through
line 22 and through the intercooler ~3. Passage of the air
through line 24 results in passage through a first 10w
path in the second air-to-air intercooler 26. The second
flow path through intercooler 26 is defined by either the
ram air passing through it and thxough the radiator to the
engine caused by the velocity of the truck or other wheeled
vehicle passing through the atmosphere or, on the other hand,
if the truck or other wheeled vehicle is moving rather slowly
or is at rest, the fan 30 serves to draw air in through the
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second flow path of the intercooler 26, and through the radi-
ator 28. The further cooled air passes through hydraulie
line 32 into the intake manifold
While it is already known in the autmotive arts to
5 place an intereooler in front of or adjacent the radiator of
an engine, the use of such an intercooler in combination
with the other elements of the system produees increased
cooling of the charged air for inereased output of the en~
gine. This cooled air is also benefieial for decreasing the
nitrous and nitrie eompounds from the exhaust emissions.
, The details of construetion of the several alements
of the drawings is well known to those in this art and have
aeeordingl~ been omitted, to more clearly illustrate the
invention.
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