EP0671552A1 - Cooling system for an internal combustion engine - Google Patents

Cooling system for an internal combustion engine Download PDF

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Publication number
EP0671552A1
EP0671552A1 EP95102644A EP95102644A EP0671552A1 EP 0671552 A1 EP0671552 A1 EP 0671552A1 EP 95102644 A EP95102644 A EP 95102644A EP 95102644 A EP95102644 A EP 95102644A EP 0671552 A1 EP0671552 A1 EP 0671552A1
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EP
European Patent Office
Prior art keywords
channel system
cylinder block
coolant
cylinder head
internal combustion
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.)
Granted
Application number
EP95102644A
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German (de)
French (fr)
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EP0671552B1 (en
Inventor
Peter Dr. Ing. Zima
Dieter Dipl. Ing. Reitz
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Adam Opel GmbH
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Adam Opel GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F1/16—Cylinder liners of wet type
    • F02F1/163—Cylinder liners of wet type the liner being midsupported
    • 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
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F1/14—Cylinders with means for directing, guiding or distributing liquid stream
    • 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
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/50—Temperature using two or more temperature sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F2001/104—Cylinders; Cylinder heads  having cooling means for liquid cooling using an open deck, i.e. the water jacket is open at the block top face

Definitions

  • the invention relates to a cooling system for a liquid-cooled reciprocating piston internal combustion engine, the cylinder block and cylinder head of which coolant flows, which is conveyed by a pump and, after passage through the internal combustion engine, is guided in a closed circuit to a cooler, an upper one assigned to the combustion chambers of the cylinders in the cylinder block Channel system and a separate lower channel system adjacent to the crank mechanism are formed.
  • Such a cooling system is described in DE 32 26 880 A1.
  • this known cooling system there is another channel system located in the cylinder head above the upper channel system arranged in the cylinder block, which channel system is supplied with relatively cool coolant via the lower channel system located in the cylinder block via a thermostatic valve.
  • the upper duct system arranged in the cylinder block and the duct system in the cylinder head in addition to the thermostat-regulated supply line.
  • the object of the invention is to provide a cooling system of the type mentioned, in which, while maintaining the advantages of such a system, a balanced temperature level also occurs around the combustion chambers, so that thermal stresses in this area can be largely avoided and that a targeted flow heat-sensitive areas in the vicinity of the cylinder head base plate is possible.
  • both the cylinder block and the cylinder head, including the cylinder block have a uniform temperature in the area of the combustion chambers of the internal combustion engine, so that undesired thermal stresses can be controlled.
  • several are distributed over the entire contact area between the cylinder block Passages and cylinder head arranged a targeted flow to the heat-sensitive areas, especially in the vicinity of the cylinder head base plate possible.
  • the portion of the cooling liquid located in the lower channel system ie close to the crank mechanism, absorbs a significantly smaller amount of heat than the upper channel system, namely the amount emitted via the cylinder walls; again the greater proportion of heat is present in the lower turning point of the reciprocating piston due to the length of time the reciprocating piston stays, so that this area is preferably particularly encompassed by the lower channel system.
  • the coolant should warm up quickly. This is done for the amount in the upper duct system, compared to the total amount by the proportion of the quantity in the lower duct system, in that the cooler is short-circuited by a main thermostatic valve and a short-circuit line in a manner known per se and the amount of heat arising around the combustion chambers is almost completely in the circulating Coolant remains.
  • the heat exchanger for heating is also in this circuit. Sufficiently heated coolant is thus available for heating purposes very quickly after the internal combustion engine has started.
  • the cooler is not included in the circuit until the operating temperature of the internal combustion engine has been reached, so that excess heat is then dissipated via the cooler.
  • the coolant located in the lower channel system is only included in the coolant circuit when the thermostatic valve at the outlet of this channel system opens, which happens when a temperature is reached that approximately corresponds to the operating temperature of the internal combustion engine, but is slightly below this.
  • the desired operating temperature is quickly reached there, despite the less heat being generated there.
  • An internal combustion engine 1 has a cylinder block 2 and a cylinder head 3.
  • the cylinder block 2 contains, next to the crank mechanism 4 located in it, a channel system 5 which is delimited at the top by a partition 6 which lies in a plane just below piston rings 7 of the reciprocating piston 8 located in the top dead center of the internal combustion engine 1.
  • Above the partition 6 there is still a sub-channel system 9 within the cylinder block 2, which forms an upper channel system 12 connected to a sub-channel system 10 in the cylinder head 3 via a plurality of passages 11 distributed over the cylinder head base plate.
  • This upper channel system 12 thus extends around the areas near the combustion chamber of both the cylinder head 3 and the cylinder block 2. It is connected to the lower channel system 5 located below the partition 6 only by a connecting line 13.
  • thermostatic valve 14 which closes the connecting line 13 as long as a cooling liquid in the lower channel system 5 has not reached a temperature close to the optimal operating temperature of the internal combustion engine 1.
  • Both the upper channel system 12 and the lower channel system 5 are supplied with coolant by a common pump 15.
  • a heat exchanger 23 provided for the vehicle heating system or the like, which is arranged parallel to the short-circuit line 20, is thus supplied with sufficiently heated coolant very quickly after the start of the internal combustion engine 1.
  • a drain 16 leads from the upper duct system 12 to a main thermostatic valve 17.
  • the main thermostatic valve 17 opens a line path 18 via a cooler 19 to the pump 15 at the operating temperature of the cooling liquid.
  • the partition 6 between the two channel systems 5 and 12 can, as can be seen in FIG. 2, be formed by a web made with the casting of the cylinder block 2.
  • a partition 6 is shown, which extends over an area 21, which corresponds approximately to the piston stroke, so that there are no coolant spaces in this area.
  • This version of the web is also made with the casting of the cylinder block 2.
  • a smaller amount of cooling liquid is required, so that the cooling liquid that is actually present is heated up to the operating temperature more quickly overall. The same advantageous effect occurs in an embodiment according to FIG.
  • FIG. 6 shows the arrangement of the thermostatic valve 14 in the connecting line 13 on the rear wall of the cylinder block 2.
  • the thermostatic valve 14 is inserted here from above into the connecting line 13 before the cylinder head 3 is attached.

Abstract

The coolant flows through a closed circuit system to a cooler (19). The system comprises a top set of passages (9) in the block (2) at combustion-chamber level, and a separate bottom one (5) at the crankcase (4). The top set is open towards the cylinder head (3), and forms a single top system of passages (12) with the coolant chambers. The chambers are connected to the passages in the block via ports (11) in the head bottom plate. The top system can extend downwards towards the crank-case as far as the level of the piston rings when the pistons (8) are at tdc. The bottom set of passages can be level with the piston bdc position.

Description

Die Erfindung betrifft ein Kühlsystem für eine flüssigkeitsgekühlte Hubkolbenbrennkraftmaschine, deren Zylinderblock und Zylinderkopf von Kühlmittel durchströmt sind, das von einer Pumpe gefördert und nach Durchlauf durch die Brennkraftmaschine in einem geschlossenen Kreislauf zu einem Kühler geführt wird, wobei im Zylinderblock ein oberes den Brennräumen der Zylinder zugeordnetes Kanalsystem und ein davon getrenntes dem Kurbeltrieb benachbartes unteres Kanalsystem ausgebildet sind.The invention relates to a cooling system for a liquid-cooled reciprocating piston internal combustion engine, the cylinder block and cylinder head of which coolant flows, which is conveyed by a pump and, after passage through the internal combustion engine, is guided in a closed circuit to a cooler, an upper one assigned to the combustion chambers of the cylinders in the cylinder block Channel system and a separate lower channel system adjacent to the crank mechanism are formed.

Ein derartiges Kühlsystem ist mit DE 32 26 880 A1 beschrieben. Bei diesem bekannten Kühlsystem liegt oberhalb des oberen im Zylinderblock angeordneten Kanalsystems ein weiteres im Zylinderkopf befindliches Kanalsystem, welches über das untere im Zylinderblock befindliche Kanalsystem über ein Thermostatventil mit relativ kühlem Kühlmittel versorgt wird. Eine Verbindung zwischen dem oberen im Zylinderblock angeordneten Kanalsystem und dem Kanalsystem im Zylinderkopf besteht neben der thermostatgeregelten Zuleitung nicht. Mit diesem Kühlsystem kann zwar die angestrebte unterschiedlich starke Kühlung des unteren Zylinderblockes und der Brennräume erreicht werden, und es steht auch relativ früh nach Start der Brennkraftmaschine erwärmtes Kühlmittel für Heizzwecke zur Verfügung. Es bilden sich im Bereich um die Brennräume der Zylinder aber auch zwei unterschiedliche Temperaturbereiche auf relativ hohem Temperaturniveau aus, nämlich einmal im oberen Bereich des Zylinderblockes im Unterbereich der Kolben und zum anderen im Bereich der Brennraumboden des Zylinderkopfes. Diese unterschiedlichen Temperaturbereiche in enger Nachbarschaft führen zu einer unerwünschten unterschiedlichen Wärmedehnung der dort befindlichen Materialien und zu von diesen ausgelösten Spannungen, die zwischen den beiden Temperaturbereichen von diesem Material, insbesondere durch eine Zylinderkopfdichtung, aufgenommen werden muß. Die damit auftretenden Dauerbelastungen reduzieren die Lebensdauer der dort befindlichen Bauteile. Nachteilig ist auch, daß der Zylinderkopf nur in seiner Längsrichtung vom Kühlmittel durchströmt wird, wodurch eine gezielte Anströmung wärmegefährdeter Bereiche in der Nähe der Zylinderkopfbodenplatte nicht möglich ist.Such a cooling system is described in DE 32 26 880 A1. In this known cooling system there is another channel system located in the cylinder head above the upper channel system arranged in the cylinder block, which channel system is supplied with relatively cool coolant via the lower channel system located in the cylinder block via a thermostatic valve. There is no connection between the upper duct system arranged in the cylinder block and the duct system in the cylinder head in addition to the thermostat-regulated supply line. With this cooling system, the desired cooling of the lower cylinder block and the combustion chambers of different degrees can be achieved, and heated coolant is also available for heating purposes relatively early after the engine is started. In the area around the combustion chambers of the cylinders, however, two different temperature areas are formed at a relatively high temperature level, namely once in the upper area of the cylinder block in the lower area of the Piston and the other in the area of the combustion chamber floor of the cylinder head. These different temperature ranges in close proximity lead to an undesirable different thermal expansion of the materials located there and to stresses triggered by them, which must be absorbed between the two temperature ranges by this material, in particular by a cylinder head gasket. The resulting permanent loads reduce the lifespan of the components located there. Another disadvantage is that the cylinder head is only flowed through in its longitudinal direction by the coolant, as a result of which a targeted flow against heat-sensitive areas in the vicinity of the cylinder head base plate is not possible.

Aufgabe der Erfindung ist es, ein Kühlsystem der eingangs genannten Art zu schaffen, bei dem unter Beibehaltung der durch ein solches System eintretenden Vorteile zusätzlich um die Brennräume ein ausgeglichenes Temperaturniveau eintritt, so daß Wärmespannungen in diesem Bereich weitestgehend vermieden werden können und daß eine gezielte Anströmung wärmegefährdeter Bereiche in Nähe der Zylinderkopfbodenplatte möglich ist.The object of the invention is to provide a cooling system of the type mentioned, in which, while maintaining the advantages of such a system, a balanced temperature level also occurs around the combustion chambers, so that thermal stresses in this area can be largely avoided and that a targeted flow heat-sensitive areas in the vicinity of the cylinder head base plate is possible.

Erfindungsgemäß wird diese Aufgabe durch die im Anspruch 1 genannten Merkmale gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind mit den Merkmalen der weiteren Ansprüche dargestellt.According to the invention, this object is achieved by the features mentioned in claim 1. Advantageous embodiments of the invention are shown with the features of the further claims.

Damit ist im Bereich der Brennräume der Brennkraftmaschine sowohl den Zylinderblock als auch den Zylinderkopf einbeziehend eine einheitliche Temperatur vorhanden, so daß unerwünschte thermische Verspannungen beherrschbar bleiben. Gleichzeitig ist durch die unmittelbare Verbindung des Teilkanalsystemes des Zylinderblockes mit dem Teilkanalsystem des Zylinderkopfes über mehrere verteilt über die gesamte Berührungsfläche zwischen Zylinderblock und Zylinderkopf angeordnete Durchlässe eine gezielte Anströmung der wärmegefährdeten Bereiche, insbesondere in Nähe der Zylinderkopfbodenplatte, möglich.In this way, both the cylinder block and the cylinder head, including the cylinder block, have a uniform temperature in the area of the combustion chambers of the internal combustion engine, so that undesired thermal stresses can be controlled. At the same time, due to the direct connection of the partial channel system of the cylinder block with the partial channel system of the cylinder head, several are distributed over the entire contact area between the cylinder block Passages and cylinder head arranged a targeted flow to the heat-sensitive areas, especially in the vicinity of the cylinder head base plate possible.

Da im Bereich des oberen Umkehrpunktes des Hubkolbens infolge der dort auftretenden Verweilzeit des Kolbens eine erhebliche Wärmemenge vom Kolben auf die Zylinderwand übertragen wird, ist es vorteilhaft, das obere Kanalsystem so weit nach unten in den Zylinderblock hineinzuziehen, daß von ihm der Bereich bis zur Höhe der Kolbenringe in OT-Stellung der Hubkolben mit umfaßt ist. Damit kann diese erhebliche Wärmemenge durch die im oberen Kanalsystem befindliche Kühlflüssigkeit aufgenommen werden, ebenso wie die Wärmemenge, welche im Zylinderkopf anfällt. Die durch das obere Kanalsystem zirkulierende Kühlflüssigkeit wird sich somit sehr schnell erwärmen und steht so auch relativ früh nach Start der Brennkraftmaschine für Heizzwecke, zum Beispiel zur Scheibenentfrostung, mit ausreichender Temperatur zur Verfügung.Since a considerable amount of heat is transferred from the piston to the cylinder wall in the area of the upper reversal point of the piston due to the dwell time of the piston there, it is advantageous to pull the upper channel system down into the cylinder block so that the area up to the height the piston rings are included in the TDC position of the reciprocating pistons. This considerable amount of heat can thus be absorbed by the coolant located in the upper channel system, as can the amount of heat that arises in the cylinder head. The coolant circulating through the upper duct system will thus heat up very quickly and is therefore available at a sufficient temperature relatively early after the engine is started for heating purposes, for example for defrosting windows.

Der im unteren Kanalsystem, also nahe des Kurbeltriebes, befindliche Anteil der Kühlflüssigkeit nimmt gegenüber dem oberen Kanalsystem eine wesentlich geringere Wärmemenge auf, nämlich die über die Zylinderwände abgegebene; wobei wiederum im unteren Umkehrpunkt der Hubkolben infolge der Verweildauer der Hubkolben der größere Wärmeanteil vorliegt, so daß vorzugsweise vom unteren Kanalsystem besonders dieser Bereich umfaßt ist.The portion of the cooling liquid located in the lower channel system, ie close to the crank mechanism, absorbs a significantly smaller amount of heat than the upper channel system, namely the amount emitted via the cylinder walls; again the greater proportion of heat is present in the lower turning point of the reciprocating piston due to the length of time the reciprocating piston stays, so that this area is preferably particularly encompassed by the lower channel system.

Bei kalter Brennkraftmaschine soll sich die Kühlflüssigkeit schnell erwärmen. Das geschieht für die im oberen Kanalsystem befindliche, gegenüber der Gesamtmenge um den Anteil der im unteren Kanalsystem befindlichen reduzierten Menge dadurch, daß durch ein Hauptthermostatventil und eine Kurzschlußleitung in an sich bekannter Weise der Kühler kurzgeschlossen wird und die um die Brennräume anfallende Wärmemenge annähernd vollständig in der umlaufenden Kühlflüssigkeit verbleibt. In diesem Kreislauf befindet sich auch der Wärmetauscher für eine Heizung. Somit steht sehr schnell nach dem Start der Brennkraftmaschine ausreichend erwärmte Kühlflüssigkeit für Heizungszwecke zur Verfügung. Erst nach Erreichen der Betriebstemperatur der Brennkraftmaschine wird der Kühler in den Kreislauf einbezogen, so daß dann überschüssige Wärme über den Kühler abgeführt wird.When the internal combustion engine is cold, the coolant should warm up quickly. This is done for the amount in the upper duct system, compared to the total amount by the proportion of the quantity in the lower duct system, in that the cooler is short-circuited by a main thermostatic valve and a short-circuit line in a manner known per se and the amount of heat arising around the combustion chambers is almost completely in the circulating Coolant remains. The heat exchanger for heating is also in this circuit. Sufficiently heated coolant is thus available for heating purposes very quickly after the internal combustion engine has started. The cooler is not included in the circuit until the operating temperature of the internal combustion engine has been reached, so that excess heat is then dissipated via the cooler.

Die im unteren Kanalsystem befindliche Kühlflüssigkeit wird erst dann in den Kühlmittelkreislauf einbezogen, wenn das Thermostatventil am Abfluß dieses Kanalsystems öffnet, was bei Erreichen einer Temperatur geschieht, die annähernd der Betriebstemperatur der Brennkraftmaschine entspricht, jedoch geringfügig unter dieser liegt.The coolant located in the lower channel system is only included in the coolant circuit when the thermostatic valve at the outlet of this channel system opens, which happens when a temperature is reached that approximately corresponds to the operating temperature of the internal combustion engine, but is slightly below this.

Durch das Verweilen der Kühlflüssigkeit im unteren Kanalsystem wird auch dort die erwünschte Betriebstemperatur trotz der dort weniger anfallenden Wärmemenge schnell erreicht.Because the coolant remains in the lower duct system, the desired operating temperature is quickly reached there, despite the less heat being generated there.

Ausführungsbeispiele der Erfindung sind nachstehend anhand von Zeichnungen näher beschrieben. Es zeigen

Fig. 1:
die schematisierte Ansicht einer Hubkolbenbrennkraftmaschine;
Fig. 2:
einen Schnitt entlang der Linie A - A in Figur 1;
Fig. 3 bis Fig. 5:
je eine vergrößerte Darstellung eines Schnittes durch eine Zylinderwand von Brennkraftmaschinen;
Fig. 6:
einen Schnitt durch die Wand am Zylinderblockende einer Brennkraftmaschine.
Embodiments of the invention are described below with reference to drawings. Show it
Fig. 1:
the schematic view of a reciprocating internal combustion engine;
Fig. 2:
a section along the line A - A in Figure 1;
3 to 5:
each an enlarged view of a section through a cylinder wall of internal combustion engines;
Fig. 6:
a section through the wall at the cylinder block end of an internal combustion engine.

Eine Brennkraftmaschine 1 weist einen Zylinderblock 2 und einen Zylinderkopf 3 auf. Der Zylinderblock 2 enthält benachbart zu dem in ihm befindlichen Kurbeltrieb 4 ein Kanalsystem 5, welches nach oben hin durch eine Trennwand 6 begrenzt ist, die in einer Ebene dicht unterhalb von Kolbenringen 7 der in der Brennkraftmaschine 1 im oberen Totpunkt befindlichen Hubkolben 8 liegt. Oberhalb der Trennwand 6 befindet sich noch innerhalb des Zylinderblockes 2 ein Teilkanalsystem 9, welches mit einem Teilkanalsystem 10 im Zylinderkopf 3 über mehrere verteilt über die Zylinderkopfbodenplatte angeordnete Durchlässe 11 verbunden ein oberes Kanalsystem 12 bildet. Dieses obere Kanalsystem 12 erstreckt sich somit um die brennraumnahen Gebiete sowohl des Zylinderkopfes 3 als auch des Zylinderblockes 2. Es ist mit dem unterhalb der Trennwand 6 befindlichen unteren Kanalsystem 5 lediglich durch eine Verbindungsleitung 13 verbunden. In der Verbindungsleitung 13 befindet sich ein Thermostatventil 14, welches die Verbindungsleitung 13 verschließt, solange eine in dem unteren Kanalsystem 5 befindliche Kühlflüssigkeit nicht eine Temperatur nahe der optimalen Betriebstemperatur der Brennkraftmaschine 1 erreicht hat. Sowohl das obere Kanalsystem 12 als auch das untere Kanalsystem 5 werden von einer gemeinsamen Pumpe 15 mit Kühlflüssigkeit versorgt. Ein für die Fahrzeugheizung oder dergleichen vorgesehener Wärmetauscher 23, der parallel zur Kurzschlußleitung 20 angeordnet ist, wird somit sehr schnell nach dem Start der Brennkraftmaschine 1 mit ausreichend erwärmter Kühlflüssigkeit versorgt. Vom oberen Kanalsystem 12 führt ein Abfluß 16 zu einem Hauptthermostatventil 17. Das Hauptthermostatventil 17 gibt bei Betriebstemperatur der Kühlflüssigkeit einen Leitungsweg 18 über einen Kühler 19 zur Pumpe 15 frei. Wenn die Kühlflüssigkeit die Betriebstemperatur noch nicht erreicht hat, dann verschließt das Hauptthermostatventil 17 den Leitungsweg 18 und gibt dafür eine Kurzschlußleitung 20 unter Umgehung des Kühlers 19 direkt zur Pumpe 15 frei. Die Trennwand 6 zwischen den beiden Kanalsystemen 5 und 12 kann, wie in Figur 2 ersichtlich, durch einen mit dem Guß des Zylinderblockes 2 hergestellten Steg gebildet sein. In Figur 3 ist eine Trennwand 6 dargestellt, welche sich über einen Bereich 21, der in etwa dem Kolbenhub entspricht, erstreckt, so daß sich in diesem Bereich keine Kühlmittelräume befinden. Diese Ausführung des Steges ist ebenfalls mit dem Guß des Zylinderblockes 2 hergestellt. Bei dieser Ausführung wird eine geringere Menge an Kühlflüssigkeit benötigt, so daß die tatsächlich vorhandene Kühlflüssigkeit insgesamt schneller auf Betriebstemperatur erwärmt wird. Der gleiche vorteilhafte Effekt tritt bei einer Ausführung gemäß Figur 4 ein, bei welcher die Trennwand 6 durch einen in den Zylinderblock 2 in an sich bekannter Weise eingesetzen Einsatz aus Kunststoff oder dergleichen gebildet ist. Als zusätzlicher Vorteil ergibt sich dadurch ein vereinfachtes Gußteil für den Zylinderblock 2. Bei der Ausführung nach Figur 5 ist die Trennwand 6 durch einen Bund an einer nassen Zylinderlaufbüchse 22 gebildet. Dadurch kann das Gußteil für den Zylinderblock 2 weiter vereinfacht werden. Figur 6 zeigt die Anordnung des Thermostatventils 14 in der Verbindungsleitung 13 an der Rückwand des Zylinderblockes 2. Das Thermostatventil 14 ist hier vor dem Aufsetzen des Zylinderkopfes 3 von oben her in die Verbindungsleitung 13 eingesetzt. Es ist jedoch ebenso möglich, das Thermostatventil 13 durch ein Fenster an der Rückwand des Zylinderblockes 2 einzusetzen.An internal combustion engine 1 has a cylinder block 2 and a cylinder head 3. The cylinder block 2 contains, next to the crank mechanism 4 located in it, a channel system 5 which is delimited at the top by a partition 6 which lies in a plane just below piston rings 7 of the reciprocating piston 8 located in the top dead center of the internal combustion engine 1. Above the partition 6 there is still a sub-channel system 9 within the cylinder block 2, which forms an upper channel system 12 connected to a sub-channel system 10 in the cylinder head 3 via a plurality of passages 11 distributed over the cylinder head base plate. This upper channel system 12 thus extends around the areas near the combustion chamber of both the cylinder head 3 and the cylinder block 2. It is connected to the lower channel system 5 located below the partition 6 only by a connecting line 13. In the connecting line 13 there is a thermostatic valve 14 which closes the connecting line 13 as long as a cooling liquid in the lower channel system 5 has not reached a temperature close to the optimal operating temperature of the internal combustion engine 1. Both the upper channel system 12 and the lower channel system 5 are supplied with coolant by a common pump 15. A heat exchanger 23 provided for the vehicle heating system or the like, which is arranged parallel to the short-circuit line 20, is thus supplied with sufficiently heated coolant very quickly after the start of the internal combustion engine 1. A drain 16 leads from the upper duct system 12 to a main thermostatic valve 17. The main thermostatic valve 17 opens a line path 18 via a cooler 19 to the pump 15 at the operating temperature of the cooling liquid. If the coolant has not yet reached the operating temperature, the main thermostatic valve 17 closes the line path 18 and gives a short-circuit line for it 20 directly bypassing the cooler 19 to the pump 15. The partition 6 between the two channel systems 5 and 12 can, as can be seen in FIG. 2, be formed by a web made with the casting of the cylinder block 2. In Figure 3, a partition 6 is shown, which extends over an area 21, which corresponds approximately to the piston stroke, so that there are no coolant spaces in this area. This version of the web is also made with the casting of the cylinder block 2. In this embodiment, a smaller amount of cooling liquid is required, so that the cooling liquid that is actually present is heated up to the operating temperature more quickly overall. The same advantageous effect occurs in an embodiment according to FIG. 4, in which the partition 6 is formed by an insert made of plastic or the like which is inserted into the cylinder block 2 in a manner known per se. As an additional advantage, this results in a simplified casting for the cylinder block 2. In the embodiment according to FIG. 5, the partition 6 is formed by a collar on a wet cylinder liner 22. As a result, the casting for the cylinder block 2 can be further simplified. FIG. 6 shows the arrangement of the thermostatic valve 14 in the connecting line 13 on the rear wall of the cylinder block 2. The thermostatic valve 14 is inserted here from above into the connecting line 13 before the cylinder head 3 is attached. However, it is also possible to use the thermostatic valve 13 through a window on the rear wall of the cylinder block 2.

Claims (4)

Kühlsystem für eine flüssigkeitsgekühlte Hubkolbenbrennkraftmaschine (1), deren Zylinderblock (2) und Zylinderkopf (3) von Kühlmittel durchströmt sind, das von einer Pumpe (15) gefördert und nach Durchlauf durch die Brennkraftmaschine (1) in einem geschlossenen Kreislauf zu einem Kühler (19) geführt wird, wobei im Zylinderblock (2) ein oberes den Brennräumen der Zylinder zugeordnetes Teilkanalsystem (9) und ein davon getrenntes, dem Kurbeltrieb (4) benachbartes unteres Kanalsystem (5) ausgebildet ist, dadurch gekennzeichnet, daß das obere Teilkanalsystem (9) des Zylinderblockes (2) zum Zylinderkopf (3) hin offen ist und mit Kühlflüssigkeitsräumen im Zylinderkopf (3) ein einheitliches oberes Kanalsystem (12) bildet, wobei die im Zylinderkopf (3) befindlichen Kühlflüssigkeitsräume vom Teilkanalsystem (9) im Zylinderblock (2) durch mehrere über die Zylinderkopfbodenplatte verteilte Durchlässe (11) mit Kühlflüssigkeit versorgt werden.Cooling system for a liquid-cooled reciprocating piston internal combustion engine (1), the cylinder block (2) and cylinder head (3) of which coolant flows, which is conveyed by a pump (15) and, after passing through the internal combustion engine (1), in a closed circuit to a cooler (19 ) is guided, an upper sub-channel system (9) assigned to the combustion chambers of the cylinders and a separate lower channel system (5) adjacent to the crank mechanism (4) being formed in the cylinder block (2), characterized in that the upper sub-channel system (9) of the cylinder block (2) to the cylinder head (3) is open and forms a uniform upper channel system (12) with coolant spaces in the cylinder head (3), the coolant spaces in the cylinder head (3) passing through the partial channel system (9) in the cylinder block (2) several passages (11) distributed over the cylinder head base plate are supplied with coolant. Kühlsystem nach Anspruch 1, dadurch gekennzeichnet, daß das einheitliche obere Kanalsystem (12) nach unten in Richtung Kurbeltrieb (4) bis zur Höhe der Kolbenringe (7) bei in OT-Stellung befindlichen Hubkolben (8) der Brennkraftmaschine (1) geführt ist.Cooling system according to claim 1, characterized in that the uniform upper channel system (12) is guided downwards in the direction of the crank mechanism (4) up to the height of the piston rings (7) with the piston (8) of the internal combustion engine (1) in the TDC position. Kühlsystem nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das untere im Zylinderblock (2) befindliche Kanalsystem (5) den Bereich des unteren Kolbenumkehrpunktes umfaßt.Cooling system according to claims 1 and 2, characterized in that the lower channel system (5) located in the cylinder block (2) comprises the area of the lower piston reversal point. Kühlsystem nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß das untere im Zylinderblock (2) befindliche Kanalsystem (5) sowie das obere einheitliche im Zylinderblock (2) und im Zylinderkopf (3) befindliche Kanalsystem (12) von einer gemeinsamen Pumpe (15) mit Kühlflüssigkeit beschickt werden und der Abfluß des unteren im Zylinderblock (2) befindlichen Kanalsystems (5) über eine ein annähernd bei Betriebstemperatur öffnendes Thermostatventil (14) enthaltende Verbindungsleitung (13) in das obere Kanalsystem erfolgt und der Abfluß (14) des oberen Kanalsystems (5) in an sich bekannter Weise über ein Hauptthermostatventil (17) zu einem Kühler (19) und von diesem zur Pumpe (15) geführt ist, wobei durch das Hauptthermostatventil (17) bei einer Kühlmitteltemperatur unterhalb der Betriebstemperatur der Brennkraftmaschine (1) eine Kurzschlußleitung (20) zwischen Hauptthermostatventil (17) und Pumpe (15) freigegeben und gleichzeitig der Leitungsweg über den Kühler (19) verschlossen ist.Cooling system according to claims 1 to 3, characterized in that the lower channel system (5) located in the cylinder block (2) and the upper uniform system located in the cylinder block (2) and in the cylinder head (3) Channel system (12) from a common pump (15) with coolant and the outflow of the lower channel system (5) located in the cylinder block (2) via a connecting line (13) containing a thermostatic valve (14) that opens at operating temperature into the upper channel system takes place and the drain (14) of the upper channel system (5) in a known manner via a main thermostatic valve (17) to a cooler (19) and from this to the pump (15), with the main thermostatic valve (17) at a Coolant temperature below the operating temperature of the internal combustion engine (1) a short-circuit line (20) between the main thermostatic valve (17) and pump (15) is released and at the same time the line path via the cooler (19) is closed.
EP95102644A 1994-03-10 1995-02-24 Cooling system for an internal combustion engine Expired - Lifetime EP0671552B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4407984 1994-03-10
DE4407984A DE4407984A1 (en) 1994-03-10 1994-03-10 Cooling system for a reciprocating piston internal combustion engine

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EP0671552A1 true EP0671552A1 (en) 1995-09-13
EP0671552B1 EP0671552B1 (en) 1997-09-03

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AT (1) ATE157739T1 (en)
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DE19628542A1 (en) * 1996-07-16 1998-01-22 Juergen Dipl Ing Naegeler Cooling system for an internal combustion engine
FR2855555A1 (en) * 2003-05-27 2004-12-03 Renault Sa Internal combustion engine cooling circuit, has upper cylinder head water chamber connected upstream from cooling pump whose outlet is connected to lower cylinder head water chamber, to prevent coolant from circulating in radiator
WO2009007143A1 (en) * 2007-07-06 2009-01-15 Brp-Rotax Gmbh & Co. Kg Internal combustion engine cooling system
EP2578836A3 (en) * 2002-08-30 2014-12-03 Taiho Kogyo Co., Ltd Cooling unit for engine
FR3024886A1 (en) * 2014-08-18 2016-02-19 Renault Sas CYLINDER HOUSING OF A THERMAL ENGINE
EP3358161A1 (en) * 2017-02-07 2018-08-08 Honda Motor Co., Ltd. Cooling structure for internal combustion engine
CN111894753A (en) * 2020-07-20 2020-11-06 东风商用车有限公司 Cooling device of forward flow type diesel engine
AT523181B1 (en) * 2020-02-18 2021-06-15 Avl List Gmbh COOLING SYSTEM FOR A COMBUSTION ENGINE

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DE10011143B4 (en) * 2000-03-07 2013-09-19 Bayerische Motoren Werke Aktiengesellschaft Liquid-cooled internal combustion engine with a dual-circuit cooling system
DE10047080B4 (en) * 2000-09-22 2013-06-06 Volkswagen Ag Cooling system for a liquid-cooled internal combustion engine
DE10047081B4 (en) * 2000-09-22 2013-06-06 Volkswagen Ag Method and device for cooling an internal combustion engine
DE10247122A1 (en) * 2002-10-09 2004-04-22 Bayerische Motoren Werke Ag Cylinder crankcase with cooling jacket for internal combustion engine has jacket forming two or more coolant channels in region of upper case sector
DE10306695A1 (en) 2003-02-18 2004-09-16 Daimlerchrysler Ag Internal combustion engine with a coolant circuit
JP4227914B2 (en) * 2004-03-10 2009-02-18 トヨタ自動車株式会社 Cylinder block cooling structure
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DE102014222734A1 (en) 2014-11-06 2016-05-12 Volkswagen Aktiengesellschaft Internal combustion engine with a coolant jacket surrounding the combustion chambers
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DE19628542A1 (en) * 1996-07-16 1998-01-22 Juergen Dipl Ing Naegeler Cooling system for an internal combustion engine
EP2578836A3 (en) * 2002-08-30 2014-12-03 Taiho Kogyo Co., Ltd Cooling unit for engine
FR2855555A1 (en) * 2003-05-27 2004-12-03 Renault Sa Internal combustion engine cooling circuit, has upper cylinder head water chamber connected upstream from cooling pump whose outlet is connected to lower cylinder head water chamber, to prevent coolant from circulating in radiator
WO2009007143A1 (en) * 2007-07-06 2009-01-15 Brp-Rotax Gmbh & Co. Kg Internal combustion engine cooling system
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CN101688464B (en) * 2007-07-06 2012-05-23 Brp罗泰克斯有限两合公司 Internal combustion engine cooling system
FR3024886A1 (en) * 2014-08-18 2016-02-19 Renault Sas CYLINDER HOUSING OF A THERMAL ENGINE
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EP3358161A1 (en) * 2017-02-07 2018-08-08 Honda Motor Co., Ltd. Cooling structure for internal combustion engine
US10323565B2 (en) 2017-02-07 2019-06-18 Honda Motor Co., Ltd. Cooling structure for internal combustion engine
AT523181B1 (en) * 2020-02-18 2021-06-15 Avl List Gmbh COOLING SYSTEM FOR A COMBUSTION ENGINE
AT523181A4 (en) * 2020-02-18 2021-06-15 Avl List Gmbh COOLING SYSTEM FOR A COMBUSTION ENGINE
CN111894753A (en) * 2020-07-20 2020-11-06 东风商用车有限公司 Cooling device of forward flow type diesel engine
CN111894753B (en) * 2020-07-20 2021-07-06 东风商用车有限公司 Cooling device of forward flow type diesel engine

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DE4407984A1 (en) 1995-09-14
DE59500579D1 (en) 1997-10-09
ATE157739T1 (en) 1997-09-15
ES2106581T3 (en) 1997-11-01
EP0671552B1 (en) 1997-09-03

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