EP0262598B2 - Internal-combustion engine - Google Patents

Internal-combustion engine Download PDF

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Publication number
EP0262598B2
EP0262598B2 EP87114010A EP87114010A EP0262598B2 EP 0262598 B2 EP0262598 B2 EP 0262598B2 EP 87114010 A EP87114010 A EP 87114010A EP 87114010 A EP87114010 A EP 87114010A EP 0262598 B2 EP0262598 B2 EP 0262598B2
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EP
European Patent Office
Prior art keywords
oil
throttle
combustion engine
valve
internal combustion
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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.)
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EP87114010A
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German (de)
French (fr)
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EP0262598A3 (en
EP0262598B1 (en
EP0262598A2 (en
Inventor
Jürgen Wahnschaffe
Ernst-Siegfried Hartmann
Herbert Schleiermacher
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Deutz AG
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Deutz AG
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Application filed by Deutz AG filed Critical Deutz AG
Priority to AT87114010T priority Critical patent/ATE66519T1/en
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Classifications

    • 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.
  • US-A-3,127,879 also shows an internal combustion engine with a cooling oil and lubricating oil circuit connected in parallel. Both circuits are operated by a common oil pump. To ensure that there is still enough lubricating oil in the lubricating oil circuit at a low oil pressure, a priority valve is located behind the cylinder cooling chamber and in front of the oil cooler, which only releases the passage from a certain oil pressure. This priority valve is also provided with a bypass line in which a throttle is arranged to ensure a minimum flow through the cooling oil circuit. In the flow direction behind the priority valve and in front of the oil cooler, an outflow line with a safety valve leads directly into the oil sump of the internal combustion engine. The disadvantage of this arrangement is that two valves are required, which take up space and are prone to failure. In addition, the oil pressure upstream of the heat exchanger is not even.
  • 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 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 in 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.
  • An overpressure valve 4 is arranged in the direction of flow behind the oil pump 3 and controls the outflow 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 in the direction of flow behind the engine oil cooler 10, a heater valve 14 also enabling or blocking the flow to the heater 11 here.
  • 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 bursting of the heat exchangers is thereby reduced.
  • the throttle is to be arranged 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.
  • 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 is arranged between the piston 20 and the bush 19, which is designed as a throttle.
  • 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 sleeve 19 and the oil flows through the valve inlet 22 through the gap 21, i. H. the throttle, in the valve outlet 23.
  • the arrows in FIG. 2 show 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 the throttle, while the other part of the oil is available for other purposes.
  • a throttle thus 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)
  • Glass Compositions (AREA)
  • Valve Device For Special Equipments (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

A cooling circuit (5) for an internal combustion engine in which a throttle (2) is provided upstream of a heat exchanger (10, 11). The throttle (2) equalizes the oil pressure in the internal combustion engine in front of the heat exchangers and insures that this occurs almost independently of the temperature of the oil. By this provision, the heat exchangers can be fabricated with the least expense since the danger 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 oil temperatures, due to its thick liquid, an inadmissibly high pressure can build up in the heat exchangers, which can damage them, 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.

In der US-A-3,127,879 ist gleichfalls eine Brennkraftmaschine mit einem parallel geschalteten Kühlöl- und Schmierölkreislauf gezeigt. Beide Kreisläufe werden von einer gemeinsamen Ölpumpe beaufschlagt. Damit bei einem niedrigen Öldruck noch genügend Schmieröl im Schmierölkreislauf zur Verfügung steht, ist hinter dem Zylinderkühlraum und vor dem Ölkühler ein Vorrangventil angeordnet, welches den Durchgang erst ab einem bestimmten öldruck freigibt. Dieses Vorrangventil ist weiterhin mit einer Bypass-Leitung versehen, in der eine Drossel angeordnet ist, um einen minimalen Durchfluß durch den Kühl ölkreislauf zu gewährleisten. In Strömungsrichtung hinter dem Vorrangventil und vor dem Ölkühler führt eine Abströmleitung mit einem Sicherheitsventil direkt in den Ölsumpf der Brennkraftmaschine. Nachteilig an dieser Anordnung ist, daß zwei Ventile benötigt werden, die Platz beanspruchen und störanfällig sind. Außerdem ist der Öldruck vor dem Wärmetauscher nicht vergleichmäßigt.US-A-3,127,879 also shows an internal combustion engine with a cooling oil and lubricating oil circuit connected in parallel. Both circuits are operated by a common oil pump. To ensure that there is still enough lubricating oil in the lubricating oil circuit at a low oil pressure, a priority valve is located behind the cylinder cooling chamber and in front of the oil cooler, which only releases the passage from a certain oil pressure. This priority valve is also provided with a bypass line in which a throttle is arranged to ensure a minimum flow through the cooling oil circuit. In the flow direction behind the priority valve and in front of the oil cooler, an outflow line with a safety valve leads directly into the oil sump of the internal combustion engine. The disadvantage of this arrangement is that two valves are required, which take up space and are prone to failure. In addition, the oil pressure upstream of the heat exchanger is not even.

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 Öl-temperatur 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 dieser 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 offers 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. Based on these The measure is therefore the oil pressure in front of the heat exchangers evened out and almost independent of the oil temperature.

Dabei ist die Drossel in Strömungsrichtung vor der ersten zu kühlenden Stelle der Brennkraftmaschine angeordnet, um eine Erwärmung der gesamten Brennkraftmaschine sicherzustellen.The throttle is 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 in 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.

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, und
Fig. 2
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:
Fig. 1
an oil circuit of an internal combustion engine, wherein the cooling oil and lubricating oil circuit is operated with a common oil pump, and
Fig. 2
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 Uberdruckventil 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. An overpressure valve 4 is arranged in the direction of flow behind the oil pump 3 and controls the outflow 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 in the direction of flow behind the engine oil cooler 10, a heater valve 14 also enabling or blocking the flow to the heater 11 here. 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 bursting of the heat exchangers is thereby reduced.

Wie in Fig. 1 gezeigt, ist 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, the throttle is to be arranged 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.

In Fig. 2 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. 2 geben die Strömung des Öls im geöffneten Zustand des Vorrangventils 9 wieder.2 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 is arranged between the piston 20 and the bush 19, which is designed as a throttle. 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 sleeve 19 and the oil flows through the valve inlet 22 through the gap 21, i. H. the throttle, in the valve outlet 23. The arrows in FIG. 2 show 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 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 thus 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 (4)

  1. An internal combustion engine including a cooling-oil circuit (5) and a lubricating-oil circuit (6), and a single oil pump (3) serving to supply these circuits, a heat exchanger being arranged in the cooling-oil circuit (5) and a throttle (2) being arranged upstream of the heat exchanger,
    characterized in that an oil-feedback duct controlled by a pressure relief valve (4) is arranged between the oil pump (3) and the throttle (2), that the throttle (2) is arranged upstream of the engine's first spot to be cooled, and that all the cooling oil is arranged to flow through the throttle (2).
  2. An internal combustion engine according to claim 1,
    characterized in that the throttle (2) is constructed as a bore in the engine's casing.
  3. An internal combustion engine according to claim 1 which includes a "precedence" valve (9) arranged in the cooling-oil circuit (5) and comprising a spring-loaded piston (20) held in a bush (19),
    characterized in that the throttle (2) is formed integrally with the precedence valve (9).
  4. An internal combustion engine according to claim 3,
    characterized in that a clearance (21) is provided between the piston (20) and the bush (19), and that the cooling oil flows, in the open state of the valve (9), through said clearance.
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
DE3633576 1986-10-02
DE19863633576 DE3633576A1 (en) 1986-10-02 1986-10-02 INTERNAL COMBUSTION ENGINE

Publications (4)

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

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE4325141A1 (en) * 1993-07-27 1995-02-02 Kloeckner Humboldt Deutz Ag Internal combustion engine
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
EP2260191A4 (en) * 2008-02-28 2014-05-14 Douglas K Furr High efficiency internal explosion engine

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DE333328C (en) * 1917-10-07 1921-02-22 Meyer Fa Rudolf Oil cooler with two or more cooling paths
US2078499A (en) * 1928-09-01 1937-04-27 Spontan Ab Cooling system for internal combustion engines
US2085810A (en) * 1932-06-20 1937-07-06 Spontan Ab Cooling of internal combustion engines
DE902564C (en) * 1942-11-24 1954-01-25 Sueddeutsche Kuehler Behr Lubricating device for internal combustion engines
US2526450A (en) * 1943-05-12 1950-10-17 Aspin Frank Metcalf Lubrication system
US2456951A (en) * 1946-05-01 1948-12-21 Crosley Motors Inc Cooling system for internalcombustion engines
US2611347A (en) * 1948-12-06 1952-09-23 Daimler Benz Ag Controllable cooling system for internal-combustion engines
US3065743A (en) * 1961-02-09 1962-11-27 Int Harvester Co Internal combustion engine lubricating system and temperature regulating means for the pistons thereof
US3127879A (en) * 1962-02-10 1964-04-07 Fiat Spa Cooling cylinder liners of internal combustion engines
US3213930A (en) * 1964-06-01 1965-10-26 Robinson Robert Clayton Oil temperature regulators for internal combustion engines
CH463874A (en) * 1967-02-14 1968-10-15 Hegglin Emil Oil cooling device on an internal combustion engine
US3485324A (en) * 1967-11-07 1969-12-23 Allis Chalmers Mfg Co Piston cooling system
US3687232A (en) * 1970-08-21 1972-08-29 August M Stenger Oil distribution system
US3981279A (en) * 1975-08-26 1976-09-21 General Motors Corporation Internal combustion engine system
GB1567240A (en) * 1977-04-28 1980-05-14 Brown Tractors Ltd Internal combustion engines
IT1115349B (en) * 1977-06-13 1986-02-03 Brighigna Mario INTERNAL COMBUSTION ENGINE COOLED BY LUBRICATION OIL
US4270562A (en) * 1979-09-28 1981-06-02 Caterpillar Tractor Co. Fluid sequence bypass apparatus
DE3420194A1 (en) * 1983-06-04 1985-01-31 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Control valve for pressure control or flow control
US4708095A (en) * 1986-06-16 1987-11-24 Deere & Company Combined engine cooling and lube system

Also Published As

Publication number Publication date
US4834029A (en) 1989-05-30
ATE66519T1 (en) 1991-09-15
DE3772314D1 (en) 1991-09-26
DE3633576A1 (en) 1988-04-07
EP0262598A3 (en) 1988-12-14
EP0262598B1 (en) 1991-08-21
EP0262598A2 (en) 1988-04-06

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