EP1752627B1 - Flow system for oil circuit of a combustion engine - Google Patents

Flow system for oil circuit of a combustion engine Download PDF

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Publication number
EP1752627B1
EP1752627B1 EP20060117118 EP06117118A EP1752627B1 EP 1752627 B1 EP1752627 B1 EP 1752627B1 EP 20060117118 EP20060117118 EP 20060117118 EP 06117118 A EP06117118 A EP 06117118A EP 1752627 B1 EP1752627 B1 EP 1752627B1
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EP
European Patent Office
Prior art keywords
expansion element
component
switching valve
oil
port
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EP20060117118
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German (de)
French (fr)
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EP1752627A2 (en
EP1752627A3 (en
Inventor
Claudia Knejfl
Benoit Monzie
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Mahle International GmbH
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Mahle International GmbH
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    • 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
    • F01M5/007—Thermostatic control

Definitions

  • the invention relates to a flow device within an oil circuit of an internal combustion engine according to the preamble of patent claim 1.
  • the heat exchanger is always flowed through in a lower temperature range and that at least with a predominant volume flow rate.
  • the heat exchanger should be acted upon in the lower temperature range by the complete oil volume flow.
  • From the DE 37 19 843 A1 is another flow device within an oil circuit of an internal combustion engine known.
  • the invention is concerned with the problem of preserving the oil circulation in the lower temperature range at particularly low temperatures from an excessively high pressure loss through a flow through the heat exchanger in a generic flow device.
  • the invention according to claim 1 is based on the general idea, on the one hand at particularly low temperatures in the lower temperature range for the fullest possible flow around, that is to provide a bypass of the circulating oil flow to the heat exchanger and on the other hand to provide a single multi-way switching valve, all operational desired flow paths automatically switched automatically within the oil circuit.
  • a three / three-way switching valve 1 is provided in a housing which may be part of a filter and / or heat exchanger housing in an oil circuit of an internal combustion engine of a motor vehicle.
  • This switching valve 1 has three ports, namely a port A, is supplied by the lubricating oil from the circuit when using the switching valve 1 in the oil circuit of an internal combustion engine, a port B, from which the lubricating oil is passed to the engine and a port C, through the cycle oil can be introduced, which has previously flowed through a heat exchanger.
  • the oil flows that can be supplied through the ports A and C the switching valve 1, are controllable, depending on the temperature of the in the switching valve. 1 entering oil and a pressure difference between the terminals A and C.
  • the switching valve 1 comprises a thermostat as an expansion element 2, which is displaceable longitudinally displaceable under the load of a first compression spring 3 in a longitudinal direction stepped cylindrical cavity.
  • the expansion element 2 is composed of two telescopically mutually displaceable components and that of a first component 4 and a second component 5. These two components 4, 5 move mutually relative to each other in temperature changes.
  • the expansion element 2 is supported above particularly low temperatures exclusively via the first component 4 axially in the housing and against the force of the first compression spring 3. This type of support is in Fig. 1B , C, represented.
  • the second component 5 of the expansion element 2 is supported in a region directly upstream of the connection A on the housing. This support is such that thereby the flow cross-section of the terminal A is sealed, so that in this state of the expansion element 2, a flow through the port A is blocked.
  • a closure function of the expansion element 2 is a prerequisite that the change in the total length of the expansion element by a displacement of the first component. 4 takes place within the second component 5 of the expansion element 2 due to temperature.
  • the axial end On the circumference of the second component 5 of the expansion element 2 is slidably mounted a ring cage 6, the axial end has a first region 7 in the form of an axially permeable annular collar and axially the other end a second region 8 in the form of a collar.
  • the annular collar of the second region 8 is axially impermeable.
  • the two annular collars of the first and second regions 7, 8 lie with a respective cylindrical outer circumference slidably sealed in the cylindrical cavity of the housing of the switching valve 1 at.
  • a radially outwardly projecting third annular collar 9 is provided.
  • the ring cage 6 is acted upon axially on both sides by a respective compression spring and at one end by the first compression spring 3 and the other end by an oppositely acting, on the second component 5 of the expansion element 2 supporting second compression spring 10.
  • the stiffness of the second compression spring 10 exceeds that of the first Compression spring 3.
  • the annular collar of the second region 8 of the ring cage 6 has radially inward distance from the outer circumference of the second component 5 of the expansion element 2, so that oil can flow through the annular gap given thereby.
  • the ring cage 6 At the axial end of the ring cage 6, which is defined by the second region 8, the ring cage 6 has axially extending webs 11 which are elastically deformable in the radial direction and have inwardly projecting barbs 12 at their free ends.
  • the ring cage 6 is mounted on the second component 5 of the expansion element 2 in such a way that the barbs 12 engage behind the third annular collar 9 provided on the second component 5. In this way, the second compression spring 10, the ring cage 6 maximum up to a stop of the barbs 12 to the third annular collar 9 in the direction of the first compression spring 3 facing the end of the expansion element 2 move.
  • the third annular collar 9 on the second component 5 of the expansion element 2 has on its outer circumference radially outwardly projecting feet 13 for a centric guidance of the expansion element 2 within the cylindrical recess of the switching valve. 1
  • annular collar of the second region 8 of the annular cage 6 and the third annular collar 9 of the second component 5 of the switching valve 1 are dimensionally coordinated such that they at an axial contact an oil flow between the inner circumference of the cylindrical recess of the switching valve 1 and in the axial region of this cylindrical recess located second component 5 of the expansion element 2 lock, that means that in this state in this area no oil can flow.
  • the switching valve 1 can on the design of its two compression springs, that is, the first and second compression spring 3, 10, and the temperature dependence of serving as a thermostat expansion element 2 and the nature of the storage of the expansion element 2 within the housing of the switching valve 1 depending on the pressure and temperature conditions work as follows.
  • a differentiated behavior can be achieved for a lower, medium and high temperature range.
  • the lower temperature range can still be subdivided into a range of particularly low temperatures and an area with overlying temperatures.
  • the switching valve according to the invention allows a total of four flow modes with respect to the above four temperature ranges.
  • FIG Fig. 3 Before discussing these temperature ranges in detail, reference is made to a flow chart in FIG Fig. 3 on the essential components of an engine lubricating oil circuit and as a prerequisite for understanding the four switching states of the switching valve 1 in a flow device according to the invention.
  • Circulating oil is supplied from a reservoir 14 to an internal combustion engine 15 via the switching valve 1.
  • the extracted from the reservoir 14 oil flow leads a line 19 to a filter 16, which may be equipped with a lying in a first bypass line 20 by-pass valve 18.
  • a heat exchanger 17 is arranged with a bypass line 21 bypassing this in line 19.
  • the heat exchanger 17 is the conventional radiator of the internal combustion engine 15 in a motor vehicle.
  • the first bypass line 20 is likewise connected on the one hand to the second bypass line 21 and on the other hand to the region of the line 19 lying between the filter 16 and the heat exchanger 17.
  • the aforementioned four switch positions, which can take the inventive switching valve 1 in such an oil circuit are in the four sections a to d of Fig. 1 and can be defined with respect to different temperature ranges and pressure differences within the switching valve between the terminals A and C as follows.
  • Fig. 1c illustrated switching state of the switching valve 1
  • the port A is completely closed for a flow and the port C fully open.
  • the closure of the connection A that is a closure against oil coming from the filter 16 is achieved by contacting the annular collar of the second region 8 of the annular cage 6 with the third annular collar connected to the second component 5 of the expansion element 2.
  • this switching state is a shortening of the clamping length of the second compression spring 10 before.
  • the above-indicated temperature ranges may be defined as follows, for example lower temperature range: up to 80 ° C, medium temperature range: above 80 ° C to 120 ° C, high temperature range: above 120 ° C.
  • the switching valve 1 represents practically a further development of that cited in the introduction to the prior art DE 199 43 294 A1 in which, in addition to a constructive deviating structure, in particular the function has been extended in the lower temperature range.
  • the set out for a switching valve in that prior art font operating conditions of the oil circuit in which that previously known valve is used therefore, in principle, also apply to the subject of the invention development. It is therefore expressly made to the statements in that older document as background to the present invention reference.
  • At least one of the oil volume flows which are indicated with “at least predominantly”, “not predominantly” or “possibly a volumetric flow proportion” is in each case to the maximum extent possible, that is to say “not” or “completely”. is present, with the maximum possible measure at "at most” means zero.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Description

Die Erfindung betrifft eine Strömungseinrichtung innerhalb eines Ölkreislaufes eines Verbrennungsmotors nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a flow device within an oil circuit of an internal combustion engine according to the preamble of patent claim 1.

Bei einer solchen, aus DE 199 43 294 A1 bekannten Einrichtung wird der Wärmetauscher in einem unteren Temperaturbereich stets durchströmt und zwar zumindest mit einem überwiegenden Volumenstromanteil. Bevorzugt soll der Wärmeaustauscher in dem unteren Temperaturbereich von dem vollständigen Ölvolumenstrom beaufschlagt sein.In such, out DE 199 43 294 A1 known device, the heat exchanger is always flowed through in a lower temperature range and that at least with a predominant volume flow rate. Preferably, the heat exchanger should be acted upon in the lower temperature range by the complete oil volume flow.

Aus der DE 37 19 843 A1 ist eine weitere Strömungseinrichtung innerhalb eines Ölkreislaufs eines Verbrennungsmotors bekannt.From the DE 37 19 843 A1 is another flow device within an oil circuit of an internal combustion engine known.

Die Erfindung beschäftigt sich mit dem Problem, bei einer gattungsgemäßen Strömungseinrichtung den Ölkreislauf in dem unteren Temperaturbereich bei besonders niedrigen Temperaturen vor einem übermäßig hohen Druckverlust durch ein Durchströmen des Wärmetauschers zu bewahren.The invention is concerned with the problem of preserving the oil circulation in the lower temperature range at particularly low temperatures from an excessively high pressure loss through a flow through the heat exchanger in a generic flow device.

Gelöst wird dieses Problem bei einer gattungsgemäßen Strömungseinrichtung durch eine Ausführung nach den kennzeichnenden Merkmalen des Patenanspruchs 1.This problem is solved in a generic flow device by an embodiment according to the characterizing features of patent claim 1.

Die weiteren Unteransprüche betreffen vorteilhafte und zweckmäßige Ausgestaltungen des Mehrwege-Schaltventils in der erfindungsgemäßen Einrichtung.The other subclaims relate to advantageous and expedient embodiments of the multi-way switching valve in the device according to the invention.

Die Erfindung nach dem Anspruch 1 beruht auf dem allgemeinen Gedanken, einerseits bei besonders niedrigen Temperaturen im unteren Temperaturbereich für eine möglichst vollständige Umströmung, das heißt für einen Bypass des Kreislaufölstromes zu dem Wärmetauscher zu sorgen und andererseits ein einziges Mehrwege-Schaltventil vorzusehen, das sämtliche betriebsbedingt gewünschten Strömungswege innerhalb des Ölkreislaufes automatisch selbsttätig schaltet.The invention according to claim 1 is based on the general idea, on the one hand at particularly low temperatures in the lower temperature range for the fullest possible flow around, that is to provide a bypass of the circulating oil flow to the heat exchanger and on the other hand to provide a single multi-way switching valve, all operational desired flow paths automatically switched automatically within the oil circuit.

Eine vorteilhafte Ausgestaltung eines Mehrwege-Schaltventiles für eine erfindungsgemäße Strömungseinrichtung, die nachstehend näher erläutert wird, ist in der Zeichnung dargestellt.An advantageous embodiment of a multi-way switching valve for a flow device according to the invention, which will be explained in more detail below, is shown in the drawing.

In dieser zeigen jeweils in perspektivischer Ansicht

Fig. 1
einen Längsschnitt durch ein Drei/Drei-Wege-Schaltventil mit unterschiedlichen Schaltstellungen nach den Zeichnungsabschnitten a bis d,
Fig. 2
eine Bauteilgruppe in zwei Ansichten bestehend aus einem Steuerfunktion ausübenden Ausdehnungselement und einem ebenfalls Steuerfunktion ausübenden, auf dem Ausdehnungselement gelagerten Ringkäfig, in einer gegenseitigen Zuordnung wie sie beispielsweise innerhalb des Schaltventiles von kleiner 125°C gegeben sein kann,
Fig. 3
ein Fließdiagramm eines Verbrennungsmotor-Ölkreislaufes.
In this show each in perspective view
Fig. 1
a longitudinal section through a three / three-way switching valve with different switching positions according to the drawing sections a to d,
Fig. 2
a component group in two views consisting of a control function exerting expansion element and also a control function exercising, mounted on the expansion element ring cage, in a mutual assignment as may be given for example within the switching valve of less than 125 ° C,
Fig. 3
a flow diagram of an internal combustion engine oil circuit.

In einem Gehäuse, das Bestandteil eines Filter- und/oder Wärmetauschergehäuses in einem Ölkreislauf eines Verbrennungsmotors eines Kraftfahrzeuges sein kann, ist ein Drei/Drei-Wege-Schaltventil 1 vorgesehen. Dieses Schaltventil 1 besitzt drei Anschlüsse, nämlich einen Anschluss A, durch den bei einem Einsatz des Schaltventiles 1 in dem Ölkreislauf eines Verbrennungsmotors Schmieröl aus dem Kreislauf zugeführt wird, einen Anschluss B, aus dem das Schmieröl zum Verbrennungsmotor geleitet wird sowie einen Anschluss C, durch den Kreislauföl eingeführt werden kann, das zuvor einen Wärmetauscher durchströmt hat.In a housing which may be part of a filter and / or heat exchanger housing in an oil circuit of an internal combustion engine of a motor vehicle, a three / three-way switching valve 1 is provided. This switching valve 1 has three ports, namely a port A, is supplied by the lubricating oil from the circuit when using the switching valve 1 in the oil circuit of an internal combustion engine, a port B, from which the lubricating oil is passed to the engine and a port C, through the cycle oil can be introduced, which has previously flowed through a heat exchanger.

Die Ölströme, die durch die Anschlüsse A und C dem Schaltventil 1 zugeführt werden können, sind steuerbar und zwar in Abhängigkeit von der Temperatur des in das Schaltventil 1 eintretenden Öles sowie einer Druckdifferenz zwischen den Anschlüssen A und C.The oil flows that can be supplied through the ports A and C the switching valve 1, are controllable, depending on the temperature of the in the switching valve. 1 entering oil and a pressure difference between the terminals A and C.

Das Schaltventil 1 umfasst einen Thermostaten als ein Ausdehnungselement 2, das unter der Belastung einer ersten Druckfeder 3 längsverschiebbar in einem in Längsrichtung gestuft ausgeführten zylindrischen Hohlraum verlagerbar ist. Das Ausdehnungselement 2 setzt sich aus zwei teleskopartig gegeneinander verschiebbaren Bauteilen zusammen und zwar aus einem ersten Bauteil 4 und einem zweiten Bauteil 5. Diese beiden Bauteile 4, 5 verschieben sich gegenseitig relativ zueinander bei Temperaturveränderungen. Bei dem gezeichneten Ausführungsbeispiel stützt sich das Ausdehnungselement 2 oberhalb besonders niedriger Temperaturen ausschließlich über das erste Bauteil 4 axial in dem Gehäuse ab und zwar gegen die Kraft der ersten Druckfeder 3. Diese Art der Abstützung ist in Fig. 1B, C, dargestellt. Bei besonders niedrigen Temperaturen, bei denen die sich temperaturbedingt einstellende axiale Gesamtlänge des Ausdehnungselementes unterhalb eines vorbestimmbaren Grenzwertes liegt, stützt sich das zweite Bauteil 5 des Ausdehnungselementes 2 in einem dem Anschluss A direkt vorgelagerten Bereich an dem Gehäuse ab. Diese Abstützung ist derart, dass hierdurch der Strömungsquerschnitt des Anschlusses A dicht verschlossen ist, so dass bei diesem Zustand des Ausdehnungselementes 2 ein Durchfluss durch den Anschluss A versperrt ist. Zur Erzielung einer derartigen Verschlussfunktion des Ausdehnungselementes 2 gilt als Voraussetzung, dass die Veränderung der Gesamtlänge des Ausdehnungselementes durch ein Verlagern des ersten Bauteiles 4 innerhalb des zweiten Bauteiles 5 des Ausdehnungselementes 2 temperaturbedingt erfolgt.The switching valve 1 comprises a thermostat as an expansion element 2, which is displaceable longitudinally displaceable under the load of a first compression spring 3 in a longitudinal direction stepped cylindrical cavity. The expansion element 2 is composed of two telescopically mutually displaceable components and that of a first component 4 and a second component 5. These two components 4, 5 move mutually relative to each other in temperature changes. In the illustrated embodiment, the expansion element 2 is supported above particularly low temperatures exclusively via the first component 4 axially in the housing and against the force of the first compression spring 3. This type of support is in Fig. 1B , C, represented. At particularly low temperatures, in which the temperature-adjusting axial overall length of the expansion element is below a predeterminable limit value, the second component 5 of the expansion element 2 is supported in a region directly upstream of the connection A on the housing. This support is such that thereby the flow cross-section of the terminal A is sealed, so that in this state of the expansion element 2, a flow through the port A is blocked. To achieve such a closure function of the expansion element 2 is a prerequisite that the change in the total length of the expansion element by a displacement of the first component. 4 takes place within the second component 5 of the expansion element 2 due to temperature.

Auf dem Umfang des zweiten Bauteiles 5 des Ausdehnungselementes 2 ist verschiebbar gelagert ein Ringkäfig 6, der axial einenends einen ersten Bereich 7 in der Form eines axial durchlässigen Ringbundes und axial anderenends einen zweiten Bereich 8 wiederum in der Form eines Ringbundes besitzt. Der Ringbund des zweiten Bereiches 8 ist dabei axial undurchlässig. Die beiden Ringbunde des ersten und zweiten Bereiches 7, 8 liegen mit jeweils einem zylindrischen Außenumfang gleitbar dicht in dem zylindrischen Hohlraum des Gehäuses des Schaltventiles 1 an.On the circumference of the second component 5 of the expansion element 2 is slidably mounted a ring cage 6, the axial end has a first region 7 in the form of an axially permeable annular collar and axially the other end a second region 8 in the form of a collar. The annular collar of the second region 8 is axially impermeable. The two annular collars of the first and second regions 7, 8 lie with a respective cylindrical outer circumference slidably sealed in the cylindrical cavity of the housing of the switching valve 1 at.

In einem axialen Bereich des zweiten Bauteiles 5 des Ausdehnungselementes 2, der sich in dem, dem ersten Bauteil 4 angrenzenden Endbereich befindet, ist ein nach radial außen abstehender dritter Ringbund 9 vorgesehen.In an axial region of the second component 5 of the expansion element 2, which is located in the, the first component 4 adjacent end portion, a radially outwardly projecting third annular collar 9 is provided.

Der Ringkäfig 6 ist axial beidseitig von jeweils einer Druckfeder beaufschlagt und zwar einenends durch die erste Druckfeder 3 und anderenends durch eine entgegengerichtet wirkende, sich auf dem zweiten Bauteil 5 des Ausdehnungselementes 2 abstützende zweite Druckfeder 10. Die Steifigkeit der zweiten Druckfeder 10 übersteigt diejenige der ersten Druckfeder 3.The ring cage 6 is acted upon axially on both sides by a respective compression spring and at one end by the first compression spring 3 and the other end by an oppositely acting, on the second component 5 of the expansion element 2 supporting second compression spring 10. The stiffness of the second compression spring 10 exceeds that of the first Compression spring 3.

Der Ringbund des zweiten Bereiches 8 des Ringkäfigs 6 besitzt radial innen Abstand gegenüber dem Außenumfang des zweiten Bauteiles 5 des Ausdehnungselementes 2, so dass durch den hierdurch gegebenen Ringspalt Öl strömen kann. An dem axialen Ende des Ringkäfigs 6, das durch den zweiten Bereich 8 definiert ist, besitzt der Ringkäfig 6 axial verlaufende Stege 11, die in radialer Richtung elastisch verformbar sind und an ihren freien Enden nach innen ragende Widerhaken 12 besitzen. Der Ringkäfig 6 ist auf dem zweiten Bauteil 5 des Ausdehnungselementes 2 derart montiert, dass die Widerhaken 12 den an dem zweiten Bauteil 5 vorgesehenen dritten Ringbund 9 hintergreifen. Auf diese Weise kann die zweite Druckfeder 10 den Ringkäfig 6 maximal bis zu einem Anschlag der Widerhaken 12 an den dritten Ringbund 9 in Richtung auf das der ersten Druckfeder 3 zugewandte Ende des Ausdehnungselementes 2 verschieben.The annular collar of the second region 8 of the ring cage 6 has radially inward distance from the outer circumference of the second component 5 of the expansion element 2, so that oil can flow through the annular gap given thereby. At the axial end of the ring cage 6, which is defined by the second region 8, the ring cage 6 has axially extending webs 11 which are elastically deformable in the radial direction and have inwardly projecting barbs 12 at their free ends. The ring cage 6 is mounted on the second component 5 of the expansion element 2 in such a way that the barbs 12 engage behind the third annular collar 9 provided on the second component 5. In this way, the second compression spring 10, the ring cage 6 maximum up to a stop of the barbs 12 to the third annular collar 9 in the direction of the first compression spring 3 facing the end of the expansion element 2 move.

Der dritte Ringbund 9 an dem zweiten Bauteil 5 des Ausdehnungselementes 2 weist auf seinem Außenumfang radial nach außen abstehende Füße 13 auf für eine zentrische Führung des Ausdehnungselementes 2 innerhalb der zylindrischen Ausnehmung des Schaltventiles 1.The third annular collar 9 on the second component 5 of the expansion element 2 has on its outer circumference radially outwardly projecting feet 13 for a centric guidance of the expansion element 2 within the cylindrical recess of the switching valve. 1

Der Ringbund des zweiten Bereiches 8 des Ringkäfigs 6 und der dritte Ringbund 9 des zweiten Bauteiles 5 des Schaltventiles 1 sind abmessungsmäßig derart aufeinander abgestimmt, dass sie bei einer axialen Anlage einen Öldurchfluss zwischen dem Innenumfang der zylindrischen Ausnehmung des Schaltventiles 1 und dem sich im Achsbereich dieser zylindrischen Ausnehmung befindlichen zweiten Bauteil 5 des Ausdehnungselementes 2 sperren, das heißt dass in diesem Zustand in diesem Bereich kein Öl strömen kann.The annular collar of the second region 8 of the annular cage 6 and the third annular collar 9 of the second component 5 of the switching valve 1 are dimensionally coordinated such that they at an axial contact an oil flow between the inner circumference of the cylindrical recess of the switching valve 1 and in the axial region of this cylindrical recess located second component 5 of the expansion element 2 lock, that means that in this state in this area no oil can flow.

Das Schaltventil 1 kann über die Auslegung seiner beiden Druckfedern, das heißt der ersten und zweiten Druckfeder 3, 10, sowie der Temperaturabhängigkeit des als Thermostaten dienenden Ausdehnungselementes 2 sowie der Art der Lagerung des Ausdehnungselementes 2 innerhalb des Gehäuses des Schaltventiles 1 je nach Druck und Temperaturbedingungen wie folgt funktionieren.The switching valve 1 can on the design of its two compression springs, that is, the first and second compression spring 3, 10, and the temperature dependence of serving as a thermostat expansion element 2 and the nature of the storage of the expansion element 2 within the housing of the switching valve 1 depending on the pressure and temperature conditions work as follows.

Grundsätzlich kann ein differenziertes Verhalten erzielt werden für einen unteren, mittleren und hohen Temperaturbereich. Dabei kann der untere Temperaturbereich noch unterteilt werden in einen Bereich besonders niedriger Temperaturen und einen Bereich mit darüberliegenden Temperaturen.Basically, a differentiated behavior can be achieved for a lower, medium and high temperature range. In this case, the lower temperature range can still be subdivided into a range of particularly low temperatures and an area with overlying temperatures.

Damit ermöglicht das erfindungsgemäße Schaltventil insgesamt vier Durchströmungsarten bezogen auf die vorstehend genannten vier Temperaturbereiche.Thus, the switching valve according to the invention allows a total of four flow modes with respect to the above four temperature ranges.

Bevor auf diese Temperaturbereiche im einzelnen eingegangen wird, wird anhand eines Fließdiagrammes in Fig. 3 auf die wesentlichen Bestandteile eines Motor-Schmierölkreislaufes eingegangen und zwar als Voraussetzung für das Verständnis der vier Schaltzustände des Schaltventiles 1 bei einer erfindungsgemäßen Strömungseinrichtung.Before discussing these temperature ranges in detail, reference is made to a flow chart in FIG Fig. 3 on the essential components of an engine lubricating oil circuit and as a prerequisite for understanding the four switching states of the switching valve 1 in a flow device according to the invention.

Kreislauföl wird aus einem Vorratsbehälter 14 einem Verbrennungsmotor 15 über das Schaltventil 1 zugeführt. Den aus dem Vorratsbehälter 14 entnommenen Ölstrom führt eine Leitung 19 zu einem Filter 16, das mit einem in einer ersten Bypass-Leitung 20 liegenden Bypass-Ventil 18 ausgestattet sein kann. In Reihe mit dem Filter 14 ist in der Leitung 19 ein Wärmetauscher 17 mit einer diesen umgehenden zweiten Bypass-Leitung 21 angeordnet. Bei dem Wärmetauscher 17 handelt es sich um den üblichen Kühler des Verbrennungsmotors 15 in einem Kraftfahrzeug. Die erste Bypass-Leitung 20 ist gleichermaßen mit einerseits der zweiten Bypass-Leitung 21 und andererseits den zwischen dem Filter 16 und dem Wärmetauscher 17 liegenden Bereich der Leitung 19 verbunden. Während die Leitung 19 stromab des Wärmetauschers 17 mit dem Anschluss C des Schaltventiles 1 verbunden ist, führt die den Wärmetauscher 17 umgehende, zweite Bypassleitung 21 zu dem Anschluss A des Schaltventiles 1. In den Verbrennungsmotor 15 gelangt der Ölstrom aus dem Anschluss B des Schaltventiles 1.Circulating oil is supplied from a reservoir 14 to an internal combustion engine 15 via the switching valve 1. The extracted from the reservoir 14 oil flow leads a line 19 to a filter 16, which may be equipped with a lying in a first bypass line 20 by-pass valve 18. In series with the filter 14, a heat exchanger 17 is arranged with a bypass line 21 bypassing this in line 19. The heat exchanger 17 is the conventional radiator of the internal combustion engine 15 in a motor vehicle. The first bypass line 20 is likewise connected on the one hand to the second bypass line 21 and on the other hand to the region of the line 19 lying between the filter 16 and the heat exchanger 17. While the line 19 is connected downstream of the heat exchanger 17 to the terminal C of the switching valve 1, the second bypass line 21 bypassing the heat exchanger 17 leads to the port A of the switching valve 1. In the internal combustion engine 15, the oil flow arrives from the port B of the switching valve 1 ,

Die vorstehend genannten vier Schaltstellungen, die das erfindungsgemäße Schaltventil 1 bei einem solchen Ölkreislauf einnehmen kann, sind in den vier Teilabschnitten a bis d der Fig. 1 dargestellt und lassen sich bezogen auf verschiedene Temperaturbereiche und Druckdifferenzen innerhalb des Schaltventiles zwischen den Anschlüssen A und C wie folgt definieren.The aforementioned four switch positions, which can take the inventive switching valve 1 in such an oil circuit are in the four sections a to d of Fig. 1 and can be defined with respect to different temperature ranges and pressure differences within the switching valve between the terminals A and C as follows.

(a) Unterer Temperaturbereich(a) Lower temperature range

In diesem Temperaturbereich erfolgt entweder eine vollständige Durchströmung durch den Anschluss C, das heißt mit ausschließlich von dem Wärmetauscher 17 kommendem Öl oder eine gemeinsame Beaufschlagung der Anschlüsse A und C, wobei der Anschluss C gedrosselt sein kann. Das den Anschluss A beaufschlagende Öl hat zuvor das Filter 16 bzw. dessen Bypass-Leitung, d.h. die erste Bypass-Leitung 20 oder das Filter 16 und die erste Bypass-Leitung 20 jeweils teilweise durchströmt.In this temperature range, either a complete flow through the port C, that is, with only coming from the heat exchanger 17 oil or a common admission of the terminals A and C, wherein the terminal C can be throttled. The oil acting on the port A has previously the filter 16 or its bypass line, i. the first bypass line 20 or the filter 16 and the first bypass line 20 each partially flows through.

Eine Beaufschlagung mit Öl durch ausschließlich den Anschluss C (Fig. 1a) liegt in dem unteren Temperaturbereich vor, wenn die Druckdifferenz zwischen den Anschlüssen A und C unterhalb des in Anspruch 1 definierten Grenzwertes G liegt. Sobald dieser Differenzdruck-Grenzwert G nach oben überschritten wird, öffnet das Ausdehnungselement 2 den Anschluss A unter gleichzeitigem, zumindest teilweisem (Fig. 1d) bis vollständigem Verschluss des Anschlusses C. Bei verschlossenem Anschluss C (nicht gezeichnet) durchströmt das Schaltventil 1 ausschließlich von dem Filter 16 kommendes Öl und/oder dessen Bypass-Leitung, d.h. der ersten Bypass-Leitung 20. Dieser Schaltzustand des Schaltventiles 1 stellt sich insbesondere bei sehr niedrigen Temperaturen ein, und hat den Zweck, den sich in dem Ölkreislauf einstellenden Druckverlust, wie er insbesondere bei einem Motorkaltstart anfallen kann, zu verringern. Dies geschieht speziell dadurch, dass die relativ hohe Druckverlustquelle des Wärmetauschers 17 in diesem Zustand, das heißt bei besonders tiefen Temperaturen, in dem eine hohe Zähigkeit des Öles vorliegt, temporär beseitigt wird und zwar gegebenenfalls bei einer gleichzeitigen Bypass-Umströmung des Filters 16.Exposure to oil through only port C ( Fig. 1a ) is in the lower temperature range, when the pressure difference between the terminals A and C is below the threshold value G defined in claim 1. As soon as this differential pressure limit G is exceeded, the expansion element 2 opens the connection A under simultaneous, at least partial ( Fig. 1d ) to complete closure of the terminal C. When the connection C is closed (not shown), the switching valve 1 flows exclusively through oil coming from the filter 16 and / or its bypass line, ie the first bypass line 20. This switching state of the switching valve 1 occurs in particular at very low temperatures, and has the purpose of reducing the in the oil circuit adjusting pressure loss, such as may occur in particular during a cold engine start. This happens in particular in that the relatively high pressure loss source of the heat exchanger 17 in this state, that is, at particularly low temperatures, in which there is a high viscosity of the oil, is temporarily eliminated, and where appropriate in a simultaneous bypass flow around the filter 16.

(b) Mittlerer Temperaturbereich(b) Medium temperature range

In diesem Temperaturbereich, auf den sich der in Fig. 1b gezeichnete Zustand des Schaltventiles 1 bezieht, ist der Anschluss C geschlossen und der Anschluss A geöffnet, wobei diese beiden Anschlüsse A, C jeweils vollständig verschlossen beziehungsweise geöffnet sind. Die Art der Durchströmung ist durch Strömungspfeile in dieser Zeichnung angedeutet.In this temperature range, on which the in Fig. 1b drawn state of the switching valve 1, the terminal C is closed and the terminal A is opened, these two terminals A, C are each completely closed or opened. The type of flow is indicated by flow arrows in this drawing.

(C) Hoher Temperaturbereich(C) High temperature range

Bei diesem in Fig. 1c dargestellten Schaltzustand des Schaltventiles 1 ist der Anschluss A für eine Durchströmung vollständig geschlossen und der Anschluss C vollständig geöffnet. Erreicht wird der Verschluss des Anschlusses A, das heißt ein Verschluss gegen von dem Filter 16 kommendes Öl durch ein gegenseitiges Kontaktieren des Ringbundes des zweiten Bereiches 8 des Ringkäfigs 6 mit dem mit dem zweiten Bauteil 5 des Ausdehnungselementes 2 verbundenen dritten Ringbund. Bei diesem Schaltzustand liegt eine Verkürzung der Einspannlänge der zweiten Druckfeder 10 vor.In this in Fig. 1c illustrated switching state of the switching valve 1, the port A is completely closed for a flow and the port C fully open. The closure of the connection A, that is a closure against oil coming from the filter 16, is achieved by contacting the annular collar of the second region 8 of the annular cage 6 with the third annular collar connected to the second component 5 of the expansion element 2. In this switching state is a shortening of the clamping length of the second compression spring 10 before.

Die vorstehend angegebenen Temperaturbereiche können beispielsweise etwa wie folgt definiert sein
unterer Temperaturbereich: bis 80 °C,
mittlerer Temperaturbereich: oberhalb 80°C bis 120°C, hoher Temperaturbereich: oberhalb 120°C.The above-indicated temperature ranges may be defined as follows, for example
lower temperature range: up to 80 ° C,
medium temperature range: above 80 ° C to 120 ° C, high temperature range: above 120 ° C.

Das erfindungsgemäße Schaltventil 1 stellt praktisch eine Weiterentwicklung desjenigen nach der eingangs zum Stand der Technik zitierten DE 199 43 294 A1 dar, bei dem außer einem konstruktiv abweichenden Aufbau insbesondere die Funktion in dem unteren Temperaturbereich erweitert worden ist. Die für ein Schaltventil in jener vorbekannten Schrift dargelegten Betriebsverhältnisse des Ölkreislaufes, in den jenes vorbekannte Ventil eingesetzt ist, gelten daher grundsätzlich auch für den Gegenstand der erfindungsgemäßen Weiterentwicklung. Es wird daher ausdrücklich auf die Ausführungen in jenem älteren Dokument als Hintergrunderläuterung zu der vorliegenden Erfindung Bezug genommen.The switching valve 1 according to the invention represents practically a further development of that cited in the introduction to the prior art DE 199 43 294 A1 in which, in addition to a constructive deviating structure, in particular the function has been extended in the lower temperature range. The set out for a switching valve in that prior art font operating conditions of the oil circuit in which that previously known valve is used, therefore, in principle, also apply to the subject of the invention development. It is therefore expressly made to the statements in that older document as background to the present invention reference.

Alle in der Beschreibung und in den nachfolgenden Ansprüchen dargestellten Merkmale können sowohl einzeln als auch in beliebiger Form miteinander kombiniert erfindungswesentlich sein.All features described in the description and in the following claims can be essential to the invention, both individually and in any desired form.

Bei einem vorteilhaften Ausführungsform der Strömungseinrichtung kann vorgesehen sein, dass zumindest einer der Ölvolumenströme, die angegeben sind mit "zumindest überwiegend", "nicht überwiegend" oder "allenfalls einem Volumenstromanteil" jeweils in maximal möglichem Maße, das heißt "nicht" beziehungsweise "vollständig" vorhanden ist, wobei das maximal mögliche Maß bei "allenfalls" Null bedeutet.In an advantageous embodiment of the flow device, it can be provided that at least one of the oil volume flows which are indicated with "at least predominantly", "not predominantly" or "possibly a volumetric flow proportion" is in each case to the maximum extent possible, that is to say "not" or "completely". is present, with the maximum possible measure at "at most" means zero.

Claims (2)

  1. A flow system within an oil circuit of an internal combustion engine with a filter, a heat exchanger (17) and a multiway switching valve (1) working at least partially in dependence on the temperature of the circuit oil, in which the proportion of circuit oil that flows through the heat exchanger (17),
    - in a medium temperature range lying between a lower and an upper temperature range, is an at least not predominant volume flow proportion,
    - in an upper temperature range, is at least a predominant volume flow proportion,
    wherein switching positions of the switching valve (1) are provided in which the heat exchanger (17) can be flow-penetrated in a lower temperature range depending on the oil flow pressure loss occurring in the heat exchanger (17), namely at a pressure loss
    - equal or above a specifiable upper threshold G, at the most with a volume flow proportion,
    - below said threshold G, with an at least predominant volume flow proportion,
    characterized by the features
    - the switching valve (1) is configured as three/three-way switching valve with ports A, B, C, of which the port A is subjected to an oil flow flowing in a bypass to a heat exchanger (17), the port B discharges the oil fed into the switching valve and the port C feeds oil flowing out of the heat exchanger (17), and with a control element having an temperature-dependently volume-changeable expansion element (2) which is mounted in a spring-loaded manner in the housing of the switching valve (1), wherein the expansion element (2) consists of a first and a second component (4, 5) which are telescopically displaceable relative to each other and one of which can be directly supported in axial direction as first component (4) via a first compression spring (3) and the second component can be indirectly supported via said first compression spring in the valve housing,
    - in a lower temperature range below a specifiable threshold G for a pressure difference within the switching valve (1) between the ports A and C, the expansion element (2) closes the port A in a spring-loaded manner, wherein, at an oil pressure which lies above the pressure threshold G for the pressure difference and which is applied to the port A, the provided spring load allows an opening by displacing the entire expansion element consisting of first and second components (4, 5),
    - the second component (5) of the expansion element (2) supports an annular cage (6) which is axially displaceable on said second component,
    - the annular cage (6) has at one end a first and at the other end a second end region (7, 8), wherein the second end region (8) faces the first component (4) of the expansion element (2),
    - the annular cage (6) is axially compression-spring-loaded on both sides, namely on the one side by the first compression spring (3) supported at the valve housing and on the other side by a second compression spring (10) supported at the second component (5) of the expansion element (2), wherein the second compression spring (10) has a higher spring stiffness with respect to the first compression spring (3),
    - the first region (7) of the annular cage (6) is axially penetratable and is formed on its outer circumference as closure sliding ring valve with regard to the port C,
    - the second region (8) of the annular cage (6) has an annular collar which seals circumferentially with respect to the valve housing and to which for blocking a connection between the port A on the one side and the ports B, C on the other side, a sealing stop collar in the form of a third annular collar (9) on the second component (5) of the expansion element (2) is allocated.
  2. The flow system according to claim 1,
    characterized in
    that the annular cage (6) has axially extending webs (11) which are elastically bendable in the radial direction and at the ends of which, barbs (12) are provided via which barbs (12) the annular cage (6) can be supported on the second component (5) of the expansion element (2) against the load applied by the second compression spring (10).
EP20060117118 2005-07-29 2006-07-13 Flow system for oil circuit of a combustion engine Ceased EP1752627B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510035533 DE102005035533A1 (en) 2005-07-29 2005-07-29 Oil flow mechanism for internal combustion engine of motor vehicle, has heat exchanger and valve that are maintained in switching positions during which oil flows in lower temperature region based on pressure drop of oil flow

Publications (3)

Publication Number Publication Date
EP1752627A2 EP1752627A2 (en) 2007-02-14
EP1752627A3 EP1752627A3 (en) 2009-06-17
EP1752627B1 true EP1752627B1 (en) 2011-05-04

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Application Number Title Priority Date Filing Date
EP20060117118 Ceased EP1752627B1 (en) 2005-07-29 2006-07-13 Flow system for oil circuit of a combustion engine

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EP (1) EP1752627B1 (en)
DE (2) DE102005035533A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015207232A1 (en) * 2015-04-21 2016-10-27 Mahle International Gmbh thermostatic valve
ITUB20160126A1 (en) * 2016-02-04 2017-08-04 Ufi Filters Spa OIL FILTRATION ASSEMBLY WITH VALVE GROUP
DE102022208584A1 (en) 2022-08-18 2024-02-29 Mahle International Gmbh Liquid cooling module

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DE2427277B2 (en) * 1974-06-06 1978-09-21 Bayerische Motoren Werke Ag, 8000 Muenchen Device for controlling the lubricating oil pressure circulation system in an internal combustion engine
DE2629730B2 (en) * 1976-07-02 1978-09-21 Bayerische Motoren Werke Ag, 8000 Muenchen Device for controlling the lubricating oil pressure circulation system in an internal combustion engine
DE2854762C2 (en) * 1978-12-19 1983-01-05 Bayerische Motoren Werke AG, 8000 München Device for controlling the lubricating oil pressure circulation system in an internal combustion engine
JPS5960013A (en) * 1982-09-30 1984-04-05 Hino Motors Ltd Water-cooled type oil cooler for internal combustion engine
DE3408024A1 (en) * 1984-03-05 1985-09-12 Klöckner-Humboldt-Deutz AG, 5000 Köln THERMOSTAT CONTROL
US4512300A (en) * 1984-04-17 1985-04-23 Cummins Engine Company, Inc. Oil temperature control system for internal combustion engine
DE3715002A1 (en) * 1987-05-06 1988-11-17 Kloeckner Humboldt Deutz Ag Internal combustion engine in which oil is used for lubrication and cooling, especially where the oil cooling represents the only cooling system of the internal combustion engine
DE3719843A1 (en) 1987-06-13 1988-12-22 Messerschmitt Boelkow Blohm VALVE FOR CONTROLLING THE OIL TEMPERATURE OF AN ENGINE
DE3924494A1 (en) * 1989-07-25 1991-01-31 Kloeckner Humboldt Deutz Ag OIL TEMPERATURE CONTROL
DE4123642A1 (en) * 1991-05-25 1992-11-26 Kloeckner Humboldt Deutz Ag LUBRICATION SYSTEM
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Also Published As

Publication number Publication date
DE502006009426D1 (en) 2011-06-16
EP1752627A2 (en) 2007-02-14
DE102005035533A1 (en) 2007-02-08
EP1752627A3 (en) 2009-06-17

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