EP0449129B1 - Internal combustion engine - Google Patents

Internal combustion engine Download PDF

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Publication number
EP0449129B1
EP0449129B1 EP91104511A EP91104511A EP0449129B1 EP 0449129 B1 EP0449129 B1 EP 0449129B1 EP 91104511 A EP91104511 A EP 91104511A EP 91104511 A EP91104511 A EP 91104511A EP 0449129 B1 EP0449129 B1 EP 0449129B1
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EP
European Patent Office
Prior art keywords
cooling
liquid
engine
air
heat exchanger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP91104511A
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German (de)
French (fr)
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EP0449129A1 (en
Inventor
Hans Dipl.-Ing. Weitzenbürger
Dieter Dipl.-Ing. Esche
Michael Dipl.-Ing. Klocke
Albert Dipl.-Ing. Nolte
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Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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Priority to DE59101479T priority Critical patent/DE59101479D1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point
    • F01P3/2207—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point characterised by the coolant reaching temperatures higher than the normal atmospheric boiling point
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P2003/001—Cooling liquid
    • F01P2003/003—Cooling liquid having boiling-point higher than 100°C
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P2003/006—Liquid cooling the liquid being oil

Definitions

  • the invention relates to a reciprocating piston internal combustion engine, the heat-loaded components of which are cooled by a cooling liquid, according to the preamble of claim 1.
  • Liquid-cooled internal combustion engines usually have a liquid-air heat exchanger for the cooling liquid, which is arranged in the longitudinal direction in front of the internal combustion engine and whose cooling air is conveyed by a fan which is driven by the internal combustion engine, the internal combustion engine and liquid-air heat exchanger being in a vehicle or, in the case of a stationary one Application, stored separately on a frame.
  • the liquid-air heat exchanger With increasing power density and compactness of the internal combustion engine, the liquid-air heat exchanger is becoming increasingly voluminous, so that it is becoming increasingly difficult to accommodate it, particularly in the vehicle.
  • the space conditions are exacerbated when hydraulic units are used, the cooling capacity of which can reach 50% of the cooling capacity of the internal combustion engine.
  • DE-B 11 49 202 describes a liquid-cooled reciprocating internal combustion engine, with a plurality of cylinders arranged in series, in which pistons are guided, and which are closed by a cylinder head, which has an exhaust gas channel for each cylinder, and with at least one liquid-air heat exchanger, the laterally at a distance from the internal combustion engine and with its inlet and outlet side parallel to its longitudinal axis is attached to the same and with a cooling air plenum into which a cooling air blower arranged on the motor end face and driven by the internal combustion engine promotes cooling air.
  • the object is achieved by the characterizing features of claim 1.
  • the cooling fan with a stator in contrast to the usual stator-less fans of liquid-cooled motors, causes an increased cooling air pressure.
  • This enables the overall depth of the liquid-air heat exchanger to be increased, or its flow resistance on the cooling air side to be increased by highly effective cooling fins.
  • the cooling air is heated up more and thus better utilized, which leads to a lower cooling air requirement and thus to a smaller size of the liquid-air heat exchanger.
  • the temperature difference between the cooling medium and ambient air is increased by the features according to the invention, which also increases the heating of the cooling air and reduces the dimensions of the liquid-air heat exchanger.
  • the cooling heat is reduced by reducing the cooled surfaces and thus a further reduction in the dimensions of the liquid-air heat exchanger is achieved.
  • the advantages of a compact liquid-air heat exchanger are used in a cooling unit which is separate from the engine. Whose arrangement can be chosen completely freely due to the chosen fan drive and can be optimally adapted to the respective installation conditions in vehicles or units.
  • An advantageous embodiment of the invention allows the cooling fan to be driven directly from the engine, thereby creating the conditions for a compact engine heat exchanger unit.
  • the idler wheel has the advantage of protection against accidental contact for the impeller of the cooling fan, while the idler wheel fan is characterized by particularly low noise emissions and, since the distance between the idler wheel and the crankcase, cylinder and cylinder head may be very small, a shorter axial length of the Rotors allowed.
  • the design as a pressure blower has the advantage of a low blower power requirement, since the cooling blower conveys unheated cooling air.
  • the suction fan offers the advantage of a uniform cooling air admission to the heat exchanger and a simple guidance of the warm exhaust air.
  • the liquid-air heat exchanger is accommodated in a particularly space-saving manner and allows the warm cooling air to be advantageously removed. It may be advantageous to mount the liquid / air heat exchanger (s) separately from the engine and thus protected from its vibrations.
  • the connection between the motor-fixed cooling air blower and the air guiding scoop is advantageously designed so that a relative movement between the liquid air heat exchanger and the blower or motor is possible.
  • DE-AS 11 94 202 describes a reciprocating piston internal combustion engine, the cylinders of which are arranged in series and whose liquid-air heat exchanger is attached to the side of the reciprocating piston internal combustion engine.
  • a cooling air blower driven by the reciprocating piston internal combustion engine conveys the cooling air into a cooling air collecting space between the reciprocating piston internal combustion engine and the liquid-air heat exchanger.
  • This reciprocating piston internal combustion engine is, however, a relatively low-loaded naturally aspirated engine, the coolant-air heat exchanger of which takes up the entire engine length despite the low cooling heat.
  • the coolant-air heat exchanger In modern, highly stressed and compact engines, especially supercharged engines, it is difficult to accommodate the liquid-air heat exchanger in the design described, especially if additional space has to be created for an oil cooler on the device side of cooling systems with mechanical, hydrostatic and hydrodynamic gearboxes or retarders with high cooling capacity.
  • liquid / air heat exchanger In the case of a large number of production pieces, it is advantageous to manufacture the liquid / air heat exchanger (s) from only one element at a time. However, if engines of different outputs with smaller numbers are required, it is advantageous to assemble the individual heat exchangers in the manner of a modular system from several elements. This can be done by connecting the individual cooler elements in parallel and in series. This enables a large variety of variants with few components.
  • An advantageous embodiment of the invention is directed to the cooling of coolant and working fluid, as they occur in particular with units with hydrodynamic or hydrostatic transmissions or with retarders.
  • the compact unit according to the invention offers the possibility of dissipating not only the heat loss from the engine but also the heat loss from auxiliary units.
  • FIG. 1 shows the arrangement of the reciprocating piston internal combustion engine 10, the cooling fan 2, the cooling liquid air heat exchanger 1 and the cooling air collecting space 6.
  • the arrangement of the reciprocating piston internal combustion engine 10 of the coolant heat exchanger 1, which are fastened on the carrying device 7 and of the cooling fan 2 with the scoop 8, which are connected by means of an elastic element 9, can be seen from FIG.
  • the very compact design of the units is shown in both figures recognizable and, in the arrangement according to FIG. 1, the complete absence of hose connections between the engine and the heat exchanger.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

Die Erfindung betrifft eine Hubkolbenbrennkraftmaschine, deren wärmebelastete Bauteile von einer Kühlflüssigkeit gekühlt werden, nach dem Oberbegriff des Anspruchs 1.The invention relates to a reciprocating piston internal combustion engine, the heat-loaded components of which are cooled by a cooling liquid, according to the preamble of claim 1.

Flüssigkeitsgekühlte Brennkraftmaschinen weisen üblicherweise einen Flüssigkeits-Luftwärmetauscher für die Kühlflüssigkeit auf, der in Längsrichtung vor der Brennkraftmaschine angeordnet ist und dessen Kühlluft von einem Ventilator gefördert wird, der von der Brennkraftmaschine angetrieben ist, wobei Brennkraftmaschine und Flüssigkeits-Luftwärmetauscher in einem Fahrzeug oder, bei stationärer Anwendung, auf einem Rahmen getrennt gelagert sind. Bei wachsender Leistungsdichte und Kompaktheit der Brennkraftmaschine wird der Flüssigkeits-Luftwärmetauscher immer voluminöser, so daß dessen Unterbringung vor allem im Fahrzeug immer schwieriger wird. Die Platzverhältnisse verschärfen sich noch bei Verwendung von hydraulischen Aggregaten, deren Kühlleistungsbedarf 50 % des Kühlleistungsbedarf der Brennkraftmaschine erreichen kann.Liquid-cooled internal combustion engines usually have a liquid-air heat exchanger for the cooling liquid, which is arranged in the longitudinal direction in front of the internal combustion engine and whose cooling air is conveyed by a fan which is driven by the internal combustion engine, the internal combustion engine and liquid-air heat exchanger being in a vehicle or, in the case of a stationary one Application, stored separately on a frame. With increasing power density and compactness of the internal combustion engine, the liquid-air heat exchanger is becoming increasingly voluminous, so that it is becoming increasingly difficult to accommodate it, particularly in the vehicle. The space conditions are exacerbated when hydraulic units are used, the cooling capacity of which can reach 50% of the cooling capacity of the internal combustion engine.

Die DE-B 11 49 202 beschreibt eine flüssigkeitsgekühlte Hubkolbenbrennkraftmaschine, mit mehreren in Reihe angeordneten Zylindern, in denen Kolben geführt sind,und die von einem Zylinderkopf abgeschlossen sind, der für jeden Zylinder einen Abgaskanal aufweist, sowie mit mindestens einem Flüssigkeits-Luftwärmetauscher, der seitlich mit Abstand zur Brennkraftmaschine und mit seiner Ein- und Auslaßseite parallel zu deren Längsachse an derselben befestigt ist und mit einem Kühlluftsammelraum, in den ein an der Motorstirnseite angeordnetes und von der Brennkraftmaschine angetriebenes Kühlluftgebläse Kühlluft fördert.DE-B 11 49 202 describes a liquid-cooled reciprocating internal combustion engine, with a plurality of cylinders arranged in series, in which pistons are guided, and which are closed by a cylinder head, which has an exhaust gas channel for each cylinder, and with at least one liquid-air heat exchanger, the laterally at a distance from the internal combustion engine and with its inlet and outlet side parallel to its longitudinal axis is attached to the same and with a cooling air plenum into which a cooling air blower arranged on the motor end face and driven by the internal combustion engine promotes cooling air.

Diese gattungsgemäße Lösung bietet Vorteile bezüglich Kompaktheit und Einbaufreundlichkeit der Kühlanlage. Diese Merkmale sollen durch die Erfindung verbessert werden.This generic solution offers advantages in terms of compactness and ease of installation of the cooling system. These features are intended to be improved by the invention.

Die Aufgabe wird gelöst durch die kennzeichnenden Merkmale des Anspruchs 1. Das Kühlgebläse mit Leitrad bewirkt im Gegensatz zu den üblichen leitradlosen Lüftern flüssigkeitsgekühlter Motoren einen erhöhten Kühlluftdruck. Dieser ermöglicht die Bautiefe des Flüssigkeits-Luftwärmetauschers zu vergrößern, bzw. dessen kühlluftseitigen Strömungswiderstand durch hochwirksame Kühllamellen zu erhöhen. Dadurch wird die Kühlluft stärker aufgeheizt und somit besser ausgenutzt, was zu einem geringeren Kühlluftbedarf und damit zu einer geringeren Baugröße des Flüssigkeits-Luftwärmetauschers führt. Außerdem wird durch die erfindungsgemäßen Merkmale die Temperaturdifferenz zwischen Kühlmedium und Umgebungsluft angehoben, wodurch ebenfalls die Aufheizung der Kühlluft erhöht und die Abmessungen des Flüssigkeits-Luftwärmetauschers verringert werden. Weiterhin wird durch Vermindern der gekühlten Oberflächen die Kühlwärme abgesenkt und damit eine weitere Verminderung der Abmessungen des Flüssigkeits-Luftwärmetauschers erreicht.The object is achieved by the characterizing features of claim 1. The cooling fan with a stator, in contrast to the usual stator-less fans of liquid-cooled motors, causes an increased cooling air pressure. This enables the overall depth of the liquid-air heat exchanger to be increased, or its flow resistance on the cooling air side to be increased by highly effective cooling fins. As a result, the cooling air is heated up more and thus better utilized, which leads to a lower cooling air requirement and thus to a smaller size of the liquid-air heat exchanger. In addition, the temperature difference between the cooling medium and ambient air is increased by the features according to the invention, which also increases the heating of the cooling air and reduces the dimensions of the liquid-air heat exchanger. Furthermore, the cooling heat is reduced by reducing the cooled surfaces and thus a further reduction in the dimensions of the liquid-air heat exchanger is achieved.

In einer vorteilhaften Ausgestaltung der Erfindung werden die Vorteile eines kompakten Flüssigkeits-Luftwärmetauschers bei einem vom Motor getrennten Kühlaggregat genutzt. Dessen Anordnung kann aufgrund des gewählten Gebläseantriebes völlig frei gewählt werden und den jeweiligen Einbauverhältnissen in Fahrzeugen oder Aggregaten optimal angepaßt werden.In an advantageous embodiment of the invention, the advantages of a compact liquid-air heat exchanger are used in a cooling unit which is separate from the engine. Whose arrangement can be chosen completely freely due to the chosen fan drive and can be optimally adapted to the respective installation conditions in vehicles or units.

Eine vorteilhafte Ausbildung der Erfindung gestattet den direkten Antrieb des Kühlgebläses vom Motor aus, und schafft damit die Voraussetzungen für eine kompakte Motor-Wärmetauschereinheit.An advantageous embodiment of the invention allows the cooling fan to be driven directly from the engine, thereby creating the conditions for a compact engine heat exchanger unit.

In weiteren Unteransprüchen werden vorteilhafte Ausführungsformen des Kühlgebläses beschrieben. So weist das Vorleitrad den Vorteil eines Berührungsschutzes für das Laufrad des Kühlgebläses auf, während das Nachleitradgebläse sich durch besonders niedrige Geräuschemissionen auszeichnet und, da der Abstand zwischen den, Nachleitrad und dem Kurbelgehäuse, Zylinder und Zylinderkopf sehr klein sein darf, eine kürzere axiale Baulänge des Rotors gestattet. Die Ausbildung als Druckgebläse hat den Vorteil eines niedrigen Gebläseleistungsbedarfs, da das Kühlgebläse nicht aufgeheizte Kühlluft fördert. Dem gegenüber bietet das Sauggebläse den Vorteil einer gleichmäßigen Kühlluftbeaufschlagung der Wärmetauscher und eine einfache Führung der warmen Abluft.Advantageous embodiments of the cooling fan are described in further subclaims. For example, the idler wheel has the advantage of protection against accidental contact for the impeller of the cooling fan, while the idler wheel fan is characterized by particularly low noise emissions and, since the distance between the idler wheel and the crankcase, cylinder and cylinder head may be very small, a shorter axial length of the Rotors allowed. The design as a pressure blower has the advantage of a low blower power requirement, since the cooling blower conveys unheated cooling air. In contrast, the suction fan offers the advantage of a uniform cooling air admission to the heat exchanger and a simple guidance of the warm exhaust air.

Gemäß einer vorteilhaften Ausbildung der Erfindung werden der, bzw. die Flüssigkeits-Luftwärmetauscher besonders platzsparend untergebracht und erlauben eine vorteilhafte Abführung der warmen Kühlluft. Dabei kann es von Vorteil sein, den bzw. die Flüssigkeits-Luftwärmetauscher getrennt vom Motor und somit geschützt von dessen Vibrationen anzubringen. Die Verbindung zwischen motorfestem Kühlluftgebläse und Luftführungshutze wird vorteilhafterweise so gestaltet, daß eine Relativbewegung zwischen Flüssigkeits-Luftwärmetauscher und Gebläse bzw. Motor möglich ist.According to an advantageous embodiment of the invention, the liquid-air heat exchanger is accommodated in a particularly space-saving manner and allows the warm cooling air to be advantageously removed. It may be advantageous to mount the liquid / air heat exchanger (s) separately from the engine and thus protected from its vibrations. The connection between the motor-fixed cooling air blower and the air guiding scoop is advantageously designed so that a relative movement between the liquid air heat exchanger and the blower or motor is possible.

Eine vorteilhafte Weiterbildung der Erfindung bewirkt eine besonders kompakte Bauweise der Einheit aus Motor und Flüssigkeits-Luftwärmetauscher. Bei dieser Lösung fallen alle Schlauchverbindungen zwischen dem bzw. den Wärmetauschern und dem Motor fort. Das bietet den Vorteil erhöhter Einbaufreundlichkeit und Systemzuverlässigkeit.An advantageous further development of the invention brings about a particularly compact design of the unit comprising the motor and the liquid-air heat exchanger. With this solution, all hose connections between the heat exchanger (s) and the engine are eliminated. This offers the advantage of increased ease of installation and system reliability.

In der DE-AS 11 94 202 wird zwar eine Hubkolbenbrennkraftmaschine beschrieben, deren Zylinder in Reihe angeordnet sind und deren Flüssigkeits-Luftwärmetauscher seitlich neben der Hubkolbenbrennkraftmaschine angebaut ist. Ein von der Hubkolbenbrennkraftmaschine angetriebenes Kühlluftgebläse fördert die Kühlluft in einen Kühlluftsammelraum zwischen Hubkolbenbrennkraftmaschine und Flüssigkeits-Luftwärmetauscher.DE-AS 11 94 202 describes a reciprocating piston internal combustion engine, the cylinders of which are arranged in series and whose liquid-air heat exchanger is attached to the side of the reciprocating piston internal combustion engine. A cooling air blower driven by the reciprocating piston internal combustion engine conveys the cooling air into a cooling air collecting space between the reciprocating piston internal combustion engine and the liquid-air heat exchanger.

Bei dieser Hubkolbenbrennkraftmaschine handelt es sich aber um einen relativ niedrig belasteten Saugmotor, dessen Kühlflüssigkeits-Luftwärmetauscher trotz geringer Kühlwärme die gesamte Motorlänge einnimmt. Bei modernen hochbelasteten und kompakten Motoren, insbesondere Auflademotoren, ist es schwierig, den Flüssigkeits-Luftwärmetauscher in der beschriebenen Bauweise unterzubringen, zumal wenn zusätzlich Platz für einen geräteseitigen Ölkühler von Kühlsystemen mechanischer, hydrostatischer und hydrodynamischer Getriebe oder Retarder mit hoher Kühlleistung geschaffen werden muß.This reciprocating piston internal combustion engine is, however, a relatively low-loaded naturally aspirated engine, the coolant-air heat exchanger of which takes up the entire engine length despite the low cooling heat. In modern, highly stressed and compact engines, especially supercharged engines, it is difficult to accommodate the liquid-air heat exchanger in the design described, especially if additional space has to be created for an oil cooler on the device side of cooling systems with mechanical, hydrostatic and hydrodynamic gearboxes or retarders with high cooling capacity.

Bei großer Fertigungsstückzahl ist es von Vorteil, den bzw. die Flüssigkeits-Luftwärmetauscher aus jeweils nur einem Element herzustellen. Werden jedoch Motoren unterschiedlicher Leistung mit jeweils geringerer Stückzahl benötigt, ist es vorteilhaft, die einzelnen Wärmetauscher in Art eines Baukastensystems aus mehreren Elementen zusammenzusetzen. Dies kann durch Parallel- und durch Hintereinanderschalten der einzelnen Kühlerelemente geschehen. Auf die Weise wird eine große Variantenvielfalt mit wenig Bauelementen ermöglicht.In the case of a large number of production pieces, it is advantageous to manufacture the liquid / air heat exchanger (s) from only one element at a time. However, if engines of different outputs with smaller numbers are required, it is advantageous to assemble the individual heat exchangers in the manner of a modular system from several elements. This can be done by connecting the individual cooler elements in parallel and in series. This enables a large variety of variants with few components.

Eine vorteilhafte Ausbildung der Erfindung ist auf die Rückkühlung von Kühlflüssigkeit und Arbeitsflüssigkeit gerichtet, wie sie insbesondere bei Aggregaten mit hydrodynamischen oder hydrostatischen Getrieben oder mit Retardern auftreten. Auf diese Weise bietet das erfindungsgemäße Kompaktaggregat die Möglichkeit, nicht nur die Verlustwärme des Motors sondern auch die Verlustwärme von Hilfsaggregaten abzuführen.An advantageous embodiment of the invention is directed to the cooling of coolant and working fluid, as they occur in particular with units with hydrodynamic or hydrostatic transmissions or with retarders. In this way, the compact unit according to the invention offers the possibility of dissipating not only the heat loss from the engine but also the heat loss from auxiliary units.

Weitere Merkmale der Erfindung ergeben sich aus der folgenden Beschreibung und der Zeichnung, in der ein Ausführungsbeispiel der Erfindung schematisch dargestellt ist.Further features of the invention result from the following description and the drawing, in which an embodiment of the invention is shown schematically.

Es zeigen:

Fig.1
Eine perspektivische Ansicht des Motor-Kühler-Kompaktaggregates mit am Motor angebautem Flüssigkeits-Luftwärmetauscher,
Fig.2:
perspektivische Darstellung eines Motor-Kühler-Kompaktaggregates mit Tragvorrichtung zur getrennten Lagerung von Motor- und Flüssigkeits-Luftwärmetauscher,
Fig.3:
schematische Darstellung eines Zylinderkopfes mit weitgehend ungekühltem Abgaskanal
Show it:
Fig. 1
A perspective view of the engine-cooler compact unit with liquid-air heat exchanger attached to the engine,
Fig. 2:
perspective view of a motor-cooler compact unit with carrying device for separate storage of engine and liquid-air heat exchanger,
Fig. 3:
schematic representation of a cylinder head with largely uncooled exhaust gas duct

Aus Fig.1 geht die Anordnung der Hubkolbenbrennkraftmaschine 10, des Kühlgebläses 2, des Kühlflüssigkeits-Luftwärmetauschers 1 und des Kühlluftsammelraumes 6 hervor. Entsprechend ist aus Fig.2 die Anordnung der Hubkolbenbrennkraftmaschine 10 des Kühlflüssigkeits-Wärmetauschers 1, die auf der Tragvorrichtung 7 befestigt sind sowie des Kühlgebläses 2 mit der Hutze 8, die mittels eines elastischen Elementes 9 verbunden sind, ersichtlich. Aus beiden Abbildungen ist die sehr kompakte Bauweise der Aggregate erkennbar und bei der Anordnung nach Fig.1 zusätzlich das völlige Fehlen von Schlauchverbindungen zwischen Motor und Wärmetauscher.1 shows the arrangement of the reciprocating piston internal combustion engine 10, the cooling fan 2, the cooling liquid air heat exchanger 1 and the cooling air collecting space 6. Correspondingly, the arrangement of the reciprocating piston internal combustion engine 10 of the coolant heat exchanger 1, which are fastened on the carrying device 7 and of the cooling fan 2 with the scoop 8, which are connected by means of an elastic element 9, can be seen from FIG. The very compact design of the units is shown in both figures recognizable and, in the arrangement according to FIG. 1, the complete absence of hose connections between the engine and the heat exchanger.

In Fig.3 wird die geringe gekühlte Fläche des Abgaskanales 5 des Zylinderkopfes 4 dargestellt. Sie bewirkt eine deutliche Abnahme der Kühlwärme des Motors und damit der Größe des Flüssigkeits-Luftwärmetauschers.In Figure 3, the small cooled area of the exhaust duct 5 of the cylinder head 4 is shown. It causes a significant decrease in the cooling heat of the engine and thus the size of the liquid air heat exchanger.

Claims (2)

  1. A liquid-cooled piston engine comprising a number of cylinders disposed in a row, pistons being guided in the cylinders and the cylinders being closed by a head (4) having an exhaust-gas duct (5) for each cylinder, the engine also comprising at least one liquid/air heat exchanger (1) disposed at the side and at a distance from the engine and with its inlet and outlet side secured parallel to the longitudinal axis of the engine, the engine also comprising a cooling-air collecting chamber supplied with cooling air by a fan disposed in front and driven by the engine,
    characterised by the following features:
    a) the cooling fan (2) has a rear impeller (3);
    b) the liquid/air heat exchanger or exchangers (1) are adjusted to the pressure of cooling air from the fan (2), increased by the rear impeller (3);
    c) the pressure of the cooling-liquid system and/or the composition of the cooling liquid are chosen so that the boiling-point of the cooling liquid is between 110°C and 130°C, preferably about 125°C;
    d) the exhaust duct (5) in the cylinder head (4) is substantially uncooled and/or heat-insulated from the neighbouring cylinder-head regions, and
    e) the heat exchanger or exchangers are disposed at an angle to the plane through the axes of the cylinders, the heat exchanger being furthest apart from the engine in the region of the cooling-air fan.
  2. An engine according to claim 1, characteriesd in that the liquid/air heat exchangers (1) are provided for a liquid for cooling the engine and/or for hydraulic fluid for additional units.
EP91104511A 1990-03-29 1991-03-22 Internal combustion engine Expired - Lifetime EP0449129B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE59101479T DE59101479D1 (en) 1991-03-22 1991-03-22 Internal combustion engine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4010087A DE4010087A1 (en) 1990-03-29 1990-03-29 INTERNAL COMBUSTION ENGINE

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EP0449129A1 EP0449129A1 (en) 1991-10-02
EP0449129B1 true EP0449129B1 (en) 1994-04-27

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US6142213A (en) * 1997-11-25 2000-11-07 Siemens Canada Limited Ducted cooling system with radial-flow fan
FR2772426B1 (en) * 1997-12-11 2000-02-04 France Etat COOLING METHOD OF AN INTERNAL COMBUSTION ENGINE
US8869523B2 (en) 2011-04-14 2014-10-28 Caterpillar Inc. Control system having variable-speed engine-drive fan
CN111022169B (en) * 2019-12-20 2021-09-10 中国北方发动机研究所(天津) Closed cooling air duct structure device of side-hung fan

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US5209189A (en) 1993-05-11
ES2051536T3 (en) 1994-06-16
EP0449129A1 (en) 1991-10-02
DE4010087A1 (en) 1991-10-02

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