EP0262598A2 - Internal-combustion engine - Google Patents

Internal-combustion engine Download PDF

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Publication number
EP0262598A2
EP0262598A2 EP87114010A EP87114010A EP0262598A2 EP 0262598 A2 EP0262598 A2 EP 0262598A2 EP 87114010 A EP87114010 A EP 87114010A EP 87114010 A EP87114010 A EP 87114010A EP 0262598 A2 EP0262598 A2 EP 0262598A2
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EP
European Patent Office
Prior art keywords
oil
combustion engine
throttle
internal combustion
oil circuit
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EP87114010A
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German (de)
French (fr)
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EP0262598B1 (en
EP0262598B2 (en
EP0262598A3 (en
Inventor
Jürgen Wahnschaffe
Ernst-Siegfried Hartmann
Herbert Schleiermacher
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Deutz AG
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Kloeckner Humboldt Deutz AG
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Application filed by Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Priority to AT87114010T priority Critical patent/ATE66519T1/en
Publication of EP0262598A2 publication Critical patent/EP0262598A2/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
    • F01P9/00—Cooling having pertinent characteristics not provided for in, or of interest apart from, groups F01P1/00 - F01P7/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/005—Controlling temperature of lubricant
    • 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
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • 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
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/08—Cabin heater

Definitions

  • the invention relates to an internal combustion engine according to the preamble of the first claim.
  • DE-OS 28 25 870 describes an internal combustion engine with a cooling oil and lubricating oil circuit connected in parallel, both circuits being acted upon by a common oil pump.
  • a heat exchanger oil cooler
  • This bypass line is controlled by a thermostatic valve, which directs the oil through the oil cooler from a certain oil temperature and below it through the bypass. So that the lubricating oil circuit is primarily supplied with oil when the oil pressure is too low, a priority valve is arranged in the cooling oil circuit, which only allows passage through the cooling oil circuit above a certain oil pressure.
  • thermostatic valve in a bypass line of the heat exchanger, as described in DE-OS 28 25 870, is intended to conduct the oil through the bypass line at low temperatures.
  • the object of the invention is, while avoiding the disadvantage just mentioned, to equalize the oil pressure in an internal combustion engine upstream of the heat exchangers with simple means, so that it is almost independent of the oil temperature.
  • the throttle is advantageously arranged in the flow direction in front of the first point of the internal combustion engine to be cooled, in order to ensure that the entire internal combustion engine is heated.
  • a simple, inexpensive embodiment of the throttle is to design it as a bore in the housing of the internal combustion engine.
  • a priority valve is arranged in the cooling oil circuit, which consists of a spring-loaded piston guided in a bushing.
  • the throttle is advantageously integrated into the priority valve, a gap being expediently arranged between the piston and the bushing through which the cooling oil flows when the valve is open.
  • Fig. 1 shows an oil circuit of an internal combustion engine, wherein the cooling oil and lubricating oil circuit 5, 6 are acted upon by a common oil pump 3.
  • a pressure relief valve 4 is arranged, which controls the discharge into an oil return line 18 and thereby limits the maximum oil pressure.
  • the oil delivered by the oil pump 3 is divided into two partial flows, one of which forms the cooling oil circuit 5 and the other the lubricating oil circuit 6.
  • An oil filter 8 is arranged upstream of this in the flow direction so that only cleaned oil enters the motor 7 in the lubricating oil circuit 6.
  • a priority valve 9 is installed in the cooling oil circuit 5, which has the task of supplying the lubricating oil circuit 6 primarily with oil.
  • a throttle 2 is arranged in the cooling oil circuit 5, two heat exchangers, namely an engine oil cooler 10 and a heater 11, being arranged in the flow direction behind the engine 7 in front of an oil holding valve 12.
  • the engine oil cooler 10 is controlled by a thermostat 13, which only releases the flow through the engine oil cooler 10 at a certain predeterminable temperature of the oil.
  • the heater 11 is located downstream of the engine oil cooler 10, a heater valve 14 also enabling or blocking the flow to the heater 11.
  • a control valve 15 is arranged in the inflow thereof, which regulates a bypass 16 to the heater 11.
  • the oil pressure upstream of the heat exchangers is equalized by the throttle 2 and the risk of the heat exchangers bursting is thereby reduced.
  • Fig. 2 shows the same arrangement of the cooling oil circuit as shown in Fig. 1, only the cooling oil circuit is acted upon by a separate oil pump 17.
  • the priority valve 9 shows a priority valve 9 with an integrated throttle for installation in the cooling oil circuit of an internal combustion engine.
  • the priority valve 9 consists of a bushing 19 with a valve inlet 22 and valve outlet 23, a piston 20 loaded by a spring 24 being guided in the bushing 19.
  • a gap 21, which is designed as a throttle is arranged between the piston 20 and the bushing 19.
  • the piston 20, held by the spring 24 sits sealingly on a valve seat 25 at the valve inlet 22 and thereby blocks it.
  • the piston 20 is moved against the spring force in the bushing 19 and the oil flows through the valve inlet 22 through the gap 21, i. H. the throttle into the valve outlet 23.
  • the arrows in FIG. 3 represent the flow of the oil in the open state of the priority valve 9.
  • throttle cross section is selected in a suitable manner, only a temperature-dependent amount of oil will pass through the throttle, while the other part of the oil is available for other purposes.
  • a throttle therefore equalizes the oil pressure upstream of the heat exchangers by reducing the flow rate, in contrast to a thermostatic valve, which blocks the oil flow through the heat exchanger below a certain temperature and thereby causes the oil pressure in the heat exchanger to drop abruptly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Glass Compositions (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Die Erfindung betrifft eine Brennkraftmaschine, wobei im Kühlölkreislauf (5) in Strömungsrichtung vor einem Wärmetauscher (10, 11) eine Drossel (2) angeordnet ist. Diese Drossel (2) vergleichmäßigt den Öldruck in der Brennkraftmaschine vor den Wärmetauschern und sorgt dafür, daß dieser nahezu unabhängig von der Temperatur des Öls ist. Durch diese Maßnahme können die Wärmetauscher mit geringstem Aufwand gefertigt sein, da die Berstgefahr verringert ist.The invention relates to an internal combustion engine, a throttle (2) being arranged in the cooling oil circuit (5) in the direction of flow in front of a heat exchanger (10, 11). This throttle (2) evens out the oil pressure in the internal combustion engine in front of the heat exchangers and ensures that it is almost independent of the temperature of the oil. As a result of this measure, the heat exchangers can be manufactured with the least effort, since the risk of bursting is reduced.

Description

Die Erfindung bezieht sich auf eine Brennkraftmaschine nach dem Oberbegriff des ersten Anspruchs.The invention relates to an internal combustion engine according to the preamble of the first claim.

Die DE-OS 28 25 870 beschreibt eine Brennkraftmaschine mit einem parallel geschalteten Kühlöl- und Schmierölkreis­lauf, wobei beide Kreisläufe von einer gemeinsamen Ölpumpe beaufschlagt werden. Im Kühlölkreislauf ist ein Wärmetau­scher (Ölkühler) angeordnet, wobei diesem eine Bypasslei­tung parallel geschaltet ist. Diese Bypassleitung wird von einem Thermostatventil gesteuert, welches ab einer be­stimmten Öltemperatur das Öl durch den Ölkühler leitet und unterhalb dieser durch den Bypass. Damit bei zu niedrigem Öldruck der Schmierölkreislauf vorrangig mit Öl versorgt wird, ist im Kühlölkreislauf ein Vorrangventil angeordnet, welches den Durchgang durch den Kühlölkreislauf erst ab einem bestimmten Öldruck freigibt.DE-OS 28 25 870 describes an internal combustion engine with a cooling oil and lubricating oil circuit connected in parallel, both circuits being acted upon by a common oil pump. A heat exchanger (oil cooler) is arranged in the cooling oil circuit, with a bypass line connected in parallel. This bypass line is controlled by a thermostatic valve, which directs the oil through the oil cooler from a certain oil temperature and below it through the bypass. So that the lubricating oil circuit is primarily supplied with oil when the oil pressure is too low, a priority valve is arranged in the cooling oil circuit, which only allows passage through the cooling oil circuit above a certain oil pressure.

Bei niedrigen Temperaturen des Öls kann sich aufgrund des­sen Dickflüssigkeit ein unzulässig hoher Druck in den Wär­metauschern aufbauen, der zu einer Beschädigung dieser führen kann, da die Wärmetauscher aus Kostengründen oft mit geringstem Aufwand gefertigt sind und dadurch seine Sicherheitsreserven bezüglich eines Überschreitens des Be­triebsdruckes gering sind.At low temperatures of the oil, due to its thick liquid, an impermissibly high pressure can build up in the heat exchangers, which can lead to damage, since the heat exchangers are often manufactured with the least effort for cost reasons, and thus his Safety reserves with regard to exceeding the operating pressure are low.

Die Anordnung eines Thermostatventils in einer Bypasslei­tung des Wärmetauschers, wie in der DE-OS 28 25 870 be­schrieben, soll bei niedrigen Temperaturen des Öls dieses durch die Bypassleitung leiten.The arrangement of a thermostatic valve in a bypass line of the heat exchanger, as described in DE-OS 28 25 870, is intended to conduct the oil through the bypass line at low temperatures.

Nachteilig hieran ist jedoch, daß hierbei eine unnötig große Ölmenge fortwährend durch den Kühlölkreislauf ge­pumpt wird.A disadvantage of this, however, is that an unnecessarily large amount of oil is continuously pumped through the cooling oil circuit.

Aufgabe der Erfindung ist es, unter Vermeidung des eben genannten Nachteils, mit einfachen Mitteln den Öldruck in einer Brennkraftmaschine vor den Wärmetauschern zu ver­gleichmäßigen, so daß dieser nahezu unabhängig von der Öl­temperatur ist.The object of the invention is, while avoiding the disadvantage just mentioned, to equalize the oil pressure in an internal combustion engine upstream of the heat exchangers with simple means, so that it is almost independent of the oil temperature.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved by the characterizing features of claim 1.

Im kalten Zustand des Öls ist dieses dickflüssig, so daß die Drossel dem durchfließenden Öl einen größeren Wider­stand entgegensetzt als bei warmem Öl. Als Folge davon steigt der Öldruck vor der Drossel an, so daß das Über­druckventil in der Öl-Rückführleitung öffnet und das Öl zum Beispiel zurück in den Ölsumpf leitet. Ein Teil des Öls wird jedoch die Drossel passieren und von dieser erwärmt in den Kühlölkreislauf gelangen. Dadurch wird als vorteilhafter Nebeneffekt die Erwärmung der Brennkraftmaschine gefördert. Steigt die Temperatur des Öls vor der Drossel an, so wird das Öl dünnflüssiger und die Drosselwirkung läßt kontinuierlich nach. Aufgrund die­ ser Maßnahme ist daher der Öldruck vor den Wärmetauschern vergleichmäßigt und nahezu unabhängig von der Öltemperatur.When the oil is cold, it is viscous, so that the throttle provides greater resistance to the oil flowing through than with warm oil. As a result, the oil pressure upstream of the throttle increases, so that the pressure relief valve in the oil return line opens and, for example, directs the oil back into the oil sump. However, part of the oil will pass through the throttle and, heated by it, enter the cooling oil circuit. This promotes the heating of the internal combustion engine as an advantageous side effect. If the temperature of the oil in front of the throttle increases, the oil becomes thinner and the throttling effect decreases continuously. Because of the This measure therefore makes the oil pressure in front of the heat exchangers even and almost independent of the oil temperature.

Vorteilhafterweise ist die Drossel in Strömungsrichtung vor der ersten zu kühlenden Stelle der Brennkraftmaschine angeordnet, um eine Erwärmung der gesamten Brennkraftma­schine sicherzustellen.The throttle is advantageously arranged in the flow direction in front of the first point of the internal combustion engine to be cooled, in order to ensure that the entire internal combustion engine is heated.

Eine einfache, kostengünstige Ausführungsform der Drossel ist, diese als Bohrung im Gehäuse der Brennkraftmaschine auszubilden.A simple, inexpensive embodiment of the throttle is to design it as a bore in the housing of the internal combustion engine.

In besonderer erfindungsgemäßer Ausführung ist im Kühlöl­kreislauf ein Vorrangventil angeordnet, welches aus einem in einer Buchse geführten federbelasteten Kolben besteht. Vorteilhafterweise ist die Drossel in das Vorrangventil integriert, wobei zweckmäßigerweise zwischen Kolben und Buchse ein Spalt angeordnet ist, durch den im geöffneten Zustand des Ventils das Kühlöl strömt.In a special embodiment according to the invention, a priority valve is arranged in the cooling oil circuit, which consists of a spring-loaded piston guided in a bushing. The throttle is advantageously integrated into the priority valve, a gap being expediently arranged between the piston and the bushing through which the cooling oil flows when the valve is open.

Es ist auch vorteilhaft, die Drossel im Bereich des Wärme­tauschers anzuordnen, insbesondere die Drossel in den Wärmetauscher zu integrieren.It is also advantageous to arrange the throttle in the area of the heat exchanger, in particular to integrate the throttle in the heat exchanger.

Weitere Merkmale der Erfindung ergeben sich aus der Be­schreibung und den Zeichnungen, die Ausführungsformen der Erfindung zeigen und nachfolgend näher beschrieben sind. Es zeigt:

  • Fig. 1 einen Ölkreislauf einer Brennkraftmaschine, wobei der Kühlöl- und Schmierölkreis mit einer gemein­samen Ölpumpe betrieben wird,
  • Fig. 2 einen Kühlölkreislauf einer Brennkraftmaschine, der von einer separaten Ölpumpe betrieben wird, und
  • Fig. 3 eine erfindungsgemäße Drossel, die in ein Vorrang­ventil integriert ist.
Further features of the invention result from the description and the drawings, which show embodiments of the invention and are described in more detail below. It shows:
  • 1 is an oil circuit of an internal combustion engine, wherein the cooling oil and lubricating oil circuit is operated with a common oil pump,
  • Fig. 2 shows a cooling oil circuit of an internal combustion engine, which is operated by a separate oil pump, and
  • Fig. 3 shows a throttle according to the invention, which is integrated in a priority valve.

Fig. 1 zeigt einen Ölkreislauf einer Brennkraftmaschine, wobei der Kühlöl- und Schmierölkreis 5, 6 von einer ge­meinsamen Ölpumpe 3 beaufschlagt sind. In Strömungsrich­tung hinter der Ölpumpe 3 ist ein Überdruckventil 4 ange­ordnet, welches dem Abfluß in eine Öl-Rückführleitung 18 steuert und dadurch den maximalen Öldruck begrenzt. Das von der Ölpumpe 3 geförderte Öl teilt sich in zwei Teil­ströme auf, von denen einer den Kühlölkreislauf 5 und der andere den Schmierölkreislauf 6 bildet. Damit im Schmier­ölkreislauf 6 nur gereinigtes Öl in den Motor 7 gelangt, ist in Strömungsrichtung vor diesem ein Ölfilter 8 ange­ordnet.Fig. 1 shows an oil circuit of an internal combustion engine, wherein the cooling oil and lubricating oil circuit 5, 6 are acted upon by a common oil pump 3. In the direction of flow behind the oil pump 3, a pressure relief valve 4 is arranged, which controls the discharge into an oil return line 18 and thereby limits the maximum oil pressure. The oil delivered by the oil pump 3 is divided into two partial flows, one of which forms the cooling oil circuit 5 and the other the lubricating oil circuit 6. An oil filter 8 is arranged upstream of this in the flow direction so that only cleaned oil enters the motor 7 in the lubricating oil circuit 6.

Im Kühlölkreislauf 5 ist ein Vorrangventil 9 eingebaut, welches die Aufgabe hat, den Schmierölkreislauf 6 vorran­gig mit Öl zu versorgen. In Strömungsrichtung vor oder hinter dem Vorrangventil 9 ist im Kühlölkreislauf 5 eine Drossel 2 angeordnet, wobei zwei Wärmetauscher, nämlich ein Motorölkühler 10 und eine Heizung 11 in Strömungsrich­tung hinter dem Motor 7 vor einem Ölhalteventil 12 ange­ordnet sind. Der Motorölkühler 10 ist dabei von einem Thermostat 13 gesteuert, der erst bei einer bestimmten vorgebbaren Temperatur des Öls den Durchfluß durch den Mo­torölkühler 10 freigibt. In Strömungsrichtung hinter dem Motorölkühler 10 befindet sich die Heizung 11, wobei auch hier ein Heizungsventil 14 den Durchfluß zur Heizung 11 freigibt oder sperrt. Zusätzlich zur Regelung der Heizung 11 ist im Zufluß zu dieser ein Steuerventil 15 angeordnet, welches einen Bypaß 16 zur Heizung 11 regelt.A priority valve 9 is installed in the cooling oil circuit 5, which has the task of supplying the lubricating oil circuit 6 primarily with oil. In the flow direction upstream or downstream of the priority valve 9, a throttle 2 is arranged in the cooling oil circuit 5, two heat exchangers, namely an engine oil cooler 10 and a heater 11, being arranged in the flow direction behind the engine 7 in front of an oil holding valve 12. The engine oil cooler 10 is controlled by a thermostat 13, which only releases the flow through the engine oil cooler 10 at a certain predeterminable temperature of the oil. The heater 11 is located downstream of the engine oil cooler 10, a heater valve 14 also enabling or blocking the flow to the heater 11. In addition to regulating the heater 11, a control valve 15 is arranged in the inflow thereof, which regulates a bypass 16 to the heater 11.

Durch die Drossel 2 wird der Öldruck vor den Wärmetau­schern vergleichmäßigt und dadurch die Berstgefahr der Wärmetauscher vermindert.The oil pressure upstream of the heat exchangers is equalized by the throttle 2 and the risk of the heat exchangers bursting is thereby reduced.

Es ist vorteilhaft, wie in Fig. 1 gezeigt, die Drossel in Strömungsrichtung vor der ersten zu kühlenden Stelle im Kühlölkreislauf der Brennkraftmaschine anzuordnen, um eine Erwärmung der gesamten Brennkraftmaschine sicherzustellen.As shown in FIG. 1, it is advantageous to arrange the throttle in the flow direction upstream of the first point to be cooled in the cooling oil circuit of the internal combustion engine in order to ensure that the entire internal combustion engine is heated.

Fig. 2 zeigt dieselbe Anordnung des Kühlölkreislaufes wie in Fig. 1 gezeigt, nur ist hier der Kühlölkreislauf von einer separaten Ölpumpe 17 beaufschlagt.Fig. 2 shows the same arrangement of the cooling oil circuit as shown in Fig. 1, only the cooling oil circuit is acted upon by a separate oil pump 17.

In Fig. 3 ist ein Vorrangventil 9 mit einer integrierten Drossel zum Einbau in den Kühlölkreislauf einer Brenn­kraftmaschine gezeigt. Das Vorrangventil 9 besteht aus ei­ner Buchse 19 mit einem Ventileinlaß 22 und Ventilauslaß 23, wobei in der Buchse 19 ein von einer Feder 24 belaste­ter Kolben 20 geführt ist. Erfindungsgemäß ist zwischen Kolben 20 und Buchse 19 ein Spalt 21 angeordnet, der als Drossel ausgebildet ist. Im geschlossenen Zustand des Vor­rangventils 9 sitzt der Kolben 20, von der Feder 24 gehal­ten, dichtend auf einem Ventilsitz 25 am Ventileinlaß 22 und sperrt diesen dadurch ab. Ab einem vorgebbaren Öldruck wird der Kolben 20 entgegen der Federkraft in der Buchse 19 verschoben und das Öl strömt über den Ventileinlaß 22 durch den Spalt 21, d. h. die Drossel, in den Ventilauslaß 23. Die Pfeile in Fig. 3 geben die Strömung des Öls im ge­öffneten Zustand des Vorrangventils 9 wieder.3 shows a priority valve 9 with an integrated throttle for installation in the cooling oil circuit of an internal combustion engine. The priority valve 9 consists of a bushing 19 with a valve inlet 22 and valve outlet 23, a piston 20 loaded by a spring 24 being guided in the bushing 19. According to the invention, a gap 21, which is designed as a throttle, is arranged between the piston 20 and the bushing 19. In the closed state of the priority valve 9, the piston 20, held by the spring 24, sits sealingly on a valve seat 25 at the valve inlet 22 and thereby blocks it. From a predetermined oil pressure, the piston 20 is moved against the spring force in the bushing 19 and the oil flows through the valve inlet 22 through the gap 21, i. H. the throttle into the valve outlet 23. The arrows in FIG. 3 represent the flow of the oil in the open state of the priority valve 9.

Es sei nochmals betont, daß sich die Wirkung einer Drossel grundsätzlich von der eines Thermostatventils unterschei­det. Ein Thermostatventil kennt nur die beiden Schaltzu­stände "offen" oder "zu", je nach der Temperatur des Öls, während eine Drossel hier die Wirkung einer kontinuierli­chen temperaturabhängigen Regelung zeigt.It should be emphasized again that the effect of a throttle differs fundamentally from that of a thermostatic valve. A thermostatic valve only knows the two switching states "open" or "closed", depending on the temperature of the oil, while a throttle shows the effect of a continuous temperature-dependent control.

Ist der Drosselquerschnitt in geeigneter Weise gewählt, so wird nur eine temperaturabhängige Ölmenge die Drossel pas­sieren, während der andere Teil des Öls für andere Zwecke zur Verfügung steht.If the throttle cross section is selected in a suitable manner, only a temperature-dependent amount of oil will pass through the throttle, while the other part of the oil is available for other purposes.

Eine Drossel vergleichmäßigt demnach den Öldruck vor den Wärmetauschern durch Verringerung der Durchflußmenge im Gegensatz zu einem Thermostatventil, welches unterhalb ei­ner bestimmten Temperatur den Ölfluß durch den Wärmetau­scher blockiert und dadurch den Öldruck im Wärmetauscher abrupt absinken läßt.A throttle therefore equalizes the oil pressure upstream of the heat exchangers by reducing the flow rate, in contrast to a thermostatic valve, which blocks the oil flow through the heat exchanger below a certain temperature and thereby causes the oil pressure in the heat exchanger to drop abruptly.

Claims (6)

1. Brennkraftmaschine mit einem Kühlöl- und Schmieröl­kreislauf (5, 6) und zumindest einer diese Kreisläufe be­aufschlagenden Ölpumpe (3), und einem im Kühlölkreislauf (5) angeordneten Wärmetauscher,
dadurch gekennzeichnet, daß im Kühlölkreislauf in Strö­mungsrichtung vor dem Wärmetauscher eine Drossel (2) ange­ordnet ist und sich zwischen Ölpumpe (3) und Drossel (2) eine von einem Überdruckventil (4) gesteuerte Öl-Rückführ­leitung (18) befindet.1. Internal combustion engine with a cooling oil and lubricating oil circuit (5, 6) and at least one oil pump (3) acting on these circuits, and a heat exchanger arranged in the cooling oil circuit (5),
characterized in that a throttle (2) is arranged upstream of the heat exchanger in the cooling oil circuit and there is an oil return line (18) controlled by an overpressure valve (4) between the oil pump (3) and throttle (2). 2. Brennkraftmaschine nach Anspruch 1,
dadurch gekennzeichnet, daß die Drossel (2) in Strömungs­richtung vor der ersten zu kühlenden Stelle der Brenn­kraftmaschine angeordnet ist.2. Internal combustion engine according to claim 1,
characterized in that the throttle (2) is arranged in the flow direction in front of the first point of the internal combustion engine to be cooled. 3. Brennkraftmaschine nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die Drossel (2) als Bohrung im Gehäuse der Brennkraftmaschine ausgebildet ist.3. Internal combustion engine according to claim 1 or 2,
characterized in that the throttle (2) is designed as a bore in the housing of the internal combustion engine. 4. Brennkraftmaschine nach Anspruch 1 oder 2, mit ei­nem Vorrangventil (9) im Kühlölkreislauf (5), welches aus einem in einer Buchse (19) geführten federbelasteten Kol­ ben (20) besteht,
dadurch gekennzeichnet, daß die Drossel (2) in das Vor­rangventil (9) integriert ist.4. Internal combustion engine according to claim 1 or 2, with a priority valve (9) in the cooling oil circuit (5), which from a in a bushing (19) guided spring-loaded Kol ben (20),
characterized in that the throttle (2) is integrated in the priority valve (9). 5. Brennkraftmaschine nach Anspruch 4,
dadurch gekennzeichnet, daß zwischen Kolben (20) und Buchse (19) ein Spalt (21) angeordnet ist, durch den im geöffneten Zustand des Vorrangventils (9) das Kühlöl strömt.5. Internal combustion engine according to claim 4,
characterized in that between the piston (20) and the bushing (19) there is a gap (21) through which the cooling oil flows when the priority valve (9) is open. 6. Brennkraftmaschine nach Anspruch 1,
dadurch gekennzeichnet, daß die Drossel (2) im Bereich des Wärmetauschers angeordnet ist.6. Internal combustion engine according to claim 1,
characterized in that the throttle (2) is arranged in the region of the heat exchanger.
EP87114010A 1986-10-02 1987-09-25 Internal-combustion engine Expired - Lifetime EP0262598B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87114010T ATE66519T1 (en) 1986-10-02 1987-09-25 COMBUSTION ENGINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863633576 DE3633576A1 (en) 1986-10-02 1986-10-02 INTERNAL COMBUSTION ENGINE
DE3633576 1986-10-02

Publications (4)

Publication Number Publication Date
EP0262598A2 true EP0262598A2 (en) 1988-04-06
EP0262598A3 EP0262598A3 (en) 1988-12-14
EP0262598B1 EP0262598B1 (en) 1991-08-21
EP0262598B2 EP0262598B2 (en) 1997-03-19

Family

ID=6310913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114010A Expired - Lifetime EP0262598B2 (en) 1986-10-02 1987-09-25 Internal-combustion engine

Country Status (4)

Country Link
US (1) US4834029A (en)
EP (1) EP0262598B2 (en)
AT (1) ATE66519T1 (en)
DE (2) DE3633576A1 (en)

Cited By (1)

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EP0636772A1 (en) * 1993-07-27 1995-02-01 Klöckner-Humboldt-Deutz Aktiengesellschaft Internal combustion engine

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YU60389A (en) * 1988-04-29 1993-10-20 Steyr-Daimler-Puch Ag. OIL COOLED ENGINE WITH INTERNAL COMBUSTION
DE3843827A1 (en) * 1988-12-24 1990-07-05 Kloeckner Humboldt Deutz Ag INTERNAL COMBUSTION ENGINE WITH TWO HYDRAULIC LIQUID CIRCUITS
DE4442221A1 (en) * 1994-11-26 1996-05-30 Kloeckner Humboldt Deutz Ag Oil cooled reciprocating IC engine
DE19741861B4 (en) * 1997-09-23 2004-07-22 Daimlerchrysler Ag Device for controlling the cooling water circuit for an internal combustion engine
EP1050569A1 (en) * 1999-05-06 2000-11-08 Filip Vandeputte Liquid coolant for internal combustion engines
DE102004016506B4 (en) * 2004-04-03 2013-08-22 Mahle Filtersysteme Gmbh Heat exchanger for a heat exchange between two liquids, in particular oil cooler in a motor vehicle
WO2009108954A2 (en) * 2008-02-28 2009-09-03 Furr Douglas K High efficiency internal explosion engine

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US3213930A (en) * 1964-06-01 1965-10-26 Robinson Robert Clayton Oil temperature regulators for internal combustion engines
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DE3420194A1 (en) * 1983-06-04 1985-01-31 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Control valve for pressure control or flow control

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Also Published As

Publication number Publication date
US4834029A (en) 1989-05-30
ATE66519T1 (en) 1991-09-15
EP0262598B1 (en) 1991-08-21
EP0262598B2 (en) 1997-03-19
EP0262598A3 (en) 1988-12-14
DE3633576A1 (en) 1988-04-07
DE3772314D1 (en) 1991-09-26

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