EP1761687A1 - Internal combustion engine with lubrification by circulation of oil under pressure according to the dry sump principle - Google Patents

Internal combustion engine with lubrification by circulation of oil under pressure according to the dry sump principle

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Publication number
EP1761687A1
EP1761687A1 EP05733654A EP05733654A EP1761687A1 EP 1761687 A1 EP1761687 A1 EP 1761687A1 EP 05733654 A EP05733654 A EP 05733654A EP 05733654 A EP05733654 A EP 05733654A EP 1761687 A1 EP1761687 A1 EP 1761687A1
Authority
EP
European Patent Office
Prior art keywords
oil
internal combustion
combustion engine
sump
oil reservoir
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05733654A
Other languages
German (de)
French (fr)
Other versions
EP1761687B1 (en
Inventor
Erwin Rutschmann
Thorsten Wieg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche AG
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Filing date
Publication date
Application filed by Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP1761687A1 publication Critical patent/EP1761687A1/en
Application granted granted Critical
Publication of EP1761687B1 publication Critical patent/EP1761687B1/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • F01M13/022—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
    • 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
    • F01M1/12—Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/24—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type
    • F02B75/243—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type with only one crankshaft of the "boxer" type, e.g. all connecting rods attached to separate crankshaft bearings
    • 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
    • F01M1/12—Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10
    • F01M2001/126—Dry-sumps

Definitions

  • the invention relates to an internal combustion engine with pressure circulation lubrication on the dry sump principle, in particular for a boxer engine according to the preamble of patent claim 1.
  • an oil sump box attached to the sump cover is provided in the oil guide housing or in the oil sump, in which the oil sump is designed to supply the engine with lubricating oil is.
  • the returned by the consumers in the oil pan lubricating oil is first returned outside of the ⁇ labsaugraum forming oil pan box before it passes through the monitored in ⁇ lschottkasten by flaps openings in the actual ⁇ labsaugraum.
  • the oil flowing back into the sump is conveyed by a suction pump into a separate oil tank or reservoir. From there, the pressure oil feed pump sucks off the lubricant and pushes it over the filter and gff. Oil cooler to the lubrication points.
  • the oil tank is in most cases attached to the outside of the engine housing and has appropriate connections for the externally installed oil pressure lines.
  • the invention has for its object to increase the specific power of an internal combustion engine to develop a low-friction engine with a dry sump - pressure circulation lubrication, especially for high-speed operation, in which the return or circulation times for lubricating oil are shortened.
  • the required for the pressure circulation lubrication of the engine components are to be integrated in a space-saving manner largely in the engine.
  • the oil sump forming the wet sump is arranged directly below the dry sump space.
  • the oil sump closing down the dry sump space may be double-walled, with an oil suction snorkel leading to the engine main oil pump being placed at the bottom of the forming cavity.
  • the lube oil receiving cavity is further provided with a port which is connected to the pressure side of the dry sump oil return pump.
  • the oil sump forming the wet sump is integrated directly in the crankcase and separated from the dry sump space by one or more bulkheads.
  • This offers for example for a boxer engine due to the horizontally arranged cylinder for the oil return to the wet sump to a solution in which a dry room forming oil bulkhead in the crankcase is arranged so that left and right of the oil pan (wet sump) collecting chambers for the from the Oil bulkhead box extracted lubricating oil remain.
  • the two plenums communicate with each other through a gap formed between the oil sump cover and the bottom of the oil sump box.
  • Another aspect of the invention is that are used for oil return in the wet sump collecting chambers around the cylinder forming annular spaces.
  • the wet sump collecting chambers are arranged below the annular spaces used for oil return, the lubricating oil can pass directly from the annular spaces into the collecting space (s) via corresponding openings. This can largely be dispensed with external oil lines, so that this measure contributes to a compact and inexpensive implementation of an internal combustion engine with dry sump lubrication.
  • FIG. 1 is a dry sump oil circuit diagram of an internal combustion engine according to a first embodiment
  • 2 is a dry sump oil circuit diagram of an internal combustion engine according to a second embodiment
  • FIG. 3 is a schematic representation of oil return in the region of the cylinders according to the second embodiment
  • FIG. 4 is a dry sump oil circuit diagram of an internal combustion engine according to a third embodiment
  • FIG. 1 shows the not limited to this embodiment principle of a dry sump - oil circuit diagram for a 6-cylinder boxer engine, whose only necessary for the description of the oil circuit components are described below with reference to the drawings.
  • the engine has two crankcase halves 2 and 4, in each of which a row of cylinder banks 1 to 3 and 4 to 6 is arranged. To the two rows of cylinder banks is followed in each case by a cylinder head 6 and 8, in which the valve gear required for actuating the inlet and outlet valves is arranged.
  • the crankcase 2, 4 has below the bearing for the crankshaft 10 to a (dry sump) ⁇ labsaugraum 12, in which the intended for lubrication of the main bearing lubricating oil is collected.
  • An oil cap 14 closing off the oil suction chamber 12 at the bottom has a double-walled construction, the cavity 16 forming in the oil cap 14 being provided as a (wet sump) oil reservoir.
  • an oil return pump 18 is provided, on whose suction side an oil suction line 20 is connected, which leads to the oil suction chamber 12.
  • an oil suction snorkel 22 is fixed, which comes to rest on the upper oil cover wall 14a.
  • a line 24 is connected, which leads via a ⁇ I ⁇ uftabscheider 26, which is formed, for example.
  • a so-called swirl pot to the oil reservoir 16.
  • a main pump 28 is driven, on the suction side of a ⁇ labsaug Arthur 30 is connected, which leads via an opening in the upper oil cover wall 14 a in the oil reservoir 16.
  • an oil suction snorkel 32 placed near the lower oil lid wall 14b.
  • 4 integrated oil supply lines (not shown) to the consumers, such as the main bearing points of the crankshaft and the camshaft.
  • suction pumps 36, 38 are provided which suck the pumped from the main pump 28 in the cylinder heads 6, 8 lubricating oil and it via lines 40, 42 and the ⁇ I ⁇ uftabscheider 26 also in the oil reservoir 16 return.
  • vent lines 44, 46 are provided, which are also connected to the ⁇ I ⁇ uftabscheider 26.
  • the oil / air separator 26 is connected via a line 48 to the intake system of the internal combustion engine.
  • the dry sump pressure circulation lubrication takes place in the following manner: The lubricating oil located in the oil suction chamber 12 is sucked off via the oil return pump 18 and conveyed into the oil reservoir 16. From there, the lubricating oil is supplied via the main pump 28 to the consumers.
  • thensumpf- ⁇ labsaugraum 12 ' is bounded by an oil bulkhead 50, on the two side walls 50a and 50b (wet sump) collecting spaces 52 and 54 adjacent. Both collecting chambers 52, 54 are connected to one another via a between the lower wall of the oil pan 50c and a sump cover 14 ' forming gap 56 with each other.
  • the lubricating oil conveyed from the oil suction chamber 12 ' into the (wet sump) collecting chambers 52, 54 is guided via an annular space 58, 60 surrounding the cylinders 1 to 3 and 4 to 6, respectively, on their front side facing the crank chamber by a seal 62 (shown only in the left crankcase half 2), eg in the form of plastic glasses, are sealed.
  • the annular spaces 58, 60 have openings or apertures 64 at their lower lateral surfaces, which are in each case in communication with the (wet sump) collecting spaces 52, 54.
  • the middle cylinder of the two rows of cylinder banks 1 to 3 or 4 to 5 6 each have a vent pipe 66, 68, which is connected to the - related to the installation position of the cylinder upper side of the annular spaces 58 and 60 respectively.
  • the lubricating oil extracted from the cylinder heads 6, 8 with the aid of the suction pumps 36, 38 is also conveyed via the annular spaces 58, 10 60 into the collecting chambers 52, 54. Due to this form of oil return can largely be dispensed with externally routed oil lines; The lubricating oil can be defoamed via the annular spaces 58, 60 and air or gas fractions can be discharged to the outside via the venting connecting pieces 66, 68, so that it is possible to dispense with separate oil-air separators. As shown in Fig. 2, the wet sump plenums 52, 54 and 15, the dry sump ⁇ labsaugraum 12 'are vented via corresponding lines 70 and 72.
  • the third embodiment shown in Fig. 4 differs from the second embodiment (see FIG. 2) in that the oil bulkhead 50 ' is arranged substantially centrally in the (wet sump) oil reservoir.
  • the wet sump collecting chambers 52, 54 which are thus formed symmetrically and are interconnected via the intermediate space 56, it is ensured that, despite high transverse accelerations in both directions, sufficient lubricating oil is present in the intermediate space 56 for the main delivery pump 28.
  • Between (wet sump) oil reservoir andresumpf- ⁇ labsaugraum 12 ' is a compound, for example in the form of holes, lines above, so that even in the (wet sump) oil reservoir for venting the blowby gases can be a negative pressure.
  • a pressure limiting valve can be arranged in the connection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

Internal combustion engine with lubrication by circulation of oil under pressure according to the dry sump principle, in particular for an opposed cylinder engine with a crankcase with an oil suction chamber (12, 12′) formed in its bottom part from which lubricant oil is conveyed via an oil recirculating pump (18) provided with an oil suction line (20) to an oil reservoir (16, 52, 54, 56), while the lubricant oil in the oil reservoir is supplied to the consumers via a main feed pump (28). It is proposed to also integrate the oil reservoir (16, 52, 54, 56), which forms the wet sump, in the crankcase of the internal combustion engine.

Description

Brennkraftmaschine mit Druckumlaufschmierung nach dem Trockensumpfprinzip Internal combustion engine with pressure circulation lubrication on the dry sump principle
Die Erfindung betrifft eine Brennkraftmaschine mit Druckumlaufschmierung nach dem Trockensumpfprinzip, insbesondere für einen Boxermotor nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an internal combustion engine with pressure circulation lubrication on the dry sump principle, in particular for a boxer engine according to the preamble of patent claim 1.
Bei den heutigen wassergekühlten 6 - Zylinder - Boxermotoren der Modellreihe 911 Carrera (Firma Dr. Ing. h.c. F. Porsche AG) ist im Ölführungsgehäuse bzw. in der Ölwanne ein am Ölwannendeckel befestigter Ölschottkasten vorgesehen, in dem der Ölsumpf für die Schmierölversorgung des Motors ausgebildet ist. Das von den Verbrauchern in die Ölwanne zurückgeführte Schmieröl wird zuerst außerhalb des den Ölabsaugraum bildenden Ölschottkastens zurückgeleitet, bevor es über im Ölschottkasten durch Klappen überwachte Öffnungen in den eigentlichen Ölabsaugraum übertritt.In today 's water - cooled 6 - cylinder boxer engines of the model 911 Carrera (Dr. Ing. Hc F. Porsche AG), an oil sump box attached to the sump cover is provided in the oil guide housing or in the oil sump, in which the oil sump is designed to supply the engine with lubricating oil is. The returned by the consumers in the oil pan lubricating oil is first returned outside of the Ölabsaugraum forming oil pan box before it passes through the monitored in Ölschottkasten by flaps openings in the actual Ölabsaugraum.
Bei Motoren mit Trockensumpfschmierung wird das in die Ölwanne zurückfließende Öl von einer Absaugpumpe in einen gesonderten Öltank bzw. Ölvorratsbehälter gefördert. Von dort saugt die Druckölförderpumpe das Schmiermittel ab und drückt es über Filter und gff. Ölkühler zu den Schmierstellen. Der Öltank ist dabei in den meisten Fällen aussen am Motorgehäuse befestigt und verfügt über entsprechende Anschlüsse für die extern verlegten Öldruckleitungen.In motors with dry sump lubrication, the oil flowing back into the sump is conveyed by a suction pump into a separate oil tank or reservoir. From there, the pressure oil feed pump sucks off the lubricant and pushes it over the filter and gff. Oil cooler to the lubrication points. The oil tank is in most cases attached to the outside of the engine housing and has appropriate connections for the externally installed oil pressure lines.
Der Erfindung liegt die Aufgabe zugrunde, zur Steigerung der spezifischen Leistung einer Brennkraftmaschine ein reibungsarmes Triebwerk mit einer Trockensumpf - Druckumlaufschmierung insbesondere für den Hochdrehzahlbetrieb zu entwickeln, bei der die Rücklauf- bzw. Umlaufzeiten für Schmieröl verkürzt sind. Außerdem sollen die für die Druckumlaufschmierung der Brennkraftmaschine erforderlichen Komponenten auf platzsparende Art und Weise weitgehend im Motor integriert werden.The invention has for its object to increase the specific power of an internal combustion engine to develop a low-friction engine with a dry sump - pressure circulation lubrication, especially for high-speed operation, in which the return or circulation times for lubricating oil are shortened. In addition, the required for the pressure circulation lubrication of the engine components are to be integrated in a space-saving manner largely in the engine.
Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Patentanspruchs 1 gelöst. Erfindungsgemäß wird vorgeschlagen, Trocken- und Nasssumpfraum im Motorgehäuse der Brennkraftmaschine zu integrieren. Durch diese Maßnahme kann der für die Trockensumpfschmierung erforderliche Öltank bzw. Ölvorratsbehälter auf platzsparende Art und Weise direkt im Motor integriert werden, so dass die sonst üblicherweise notwenigen extern verlegten Ölleitungen weitestgehend entfallen. Damit einhergehend verkürzen sich die Umlaufwege und damit die Umlaufzeiten für dass Schmieröl, so dass auch bei hohen Quer- oder Längsbeschleunigungen des Fahrzeuges eine ausreichende Schmierölversorgung sichergestellt ist.This object is achieved with the features of claim 1. According to the invention, it is proposed to integrate dry and wet sump space in the engine housing of the internal combustion engine. By this measure, the required for the dry sump lubrication oil tank or oil reservoir can be integrated in a space-saving manner directly in the engine, so that the otherwise usually necessary externally installed oil lines accounted for as much as possible. This concomitantly shorten the circulation paths and thus the circulation times for that lubricating oil, so that even at high transverse or longitudinal accelerations of the vehicle, a sufficient supply of lubricating oil is ensured.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen und der Beschreibung.Further advantages and advantageous embodiments of the invention will become apparent from the dependent claims and the description.
In einer ersten vorteilhaften Ausführungsform wird vorgeschlagen, dass der den Nasssumpf bildende Ölvorratsraum direkt unterhalb des Trockensumpfraumes angeordnet ist. Dazu kann bspw. der den Trockensumpfraum nach unten hin abschließende Öldeckel doppelwandig ausgebildet sein, wobei am Boden des sich ausbildenden Hohlraumes ein zu der Motor- Hauptölpumpe führender Ölabsaugschnorchel platziert ist. Der das Schmieröl aufnehmende Hohlraum ist weiterhin mit einem Anschluss versehen, der mit der Druckseite der Trockensumpf- Ölrückförderpumpe verbunden ist.In a first advantageous embodiment, it is proposed that the oil sump forming the wet sump is arranged directly below the dry sump space. For this purpose, for example, the oil sump closing down the dry sump space may be double-walled, with an oil suction snorkel leading to the engine main oil pump being placed at the bottom of the forming cavity. The lube oil receiving cavity is further provided with a port which is connected to the pressure side of the dry sump oil return pump.
In einer zweiten vorteilhaften Ausführungsform ist der den Nasssumpf bildende Ölvorratsraum direkt im Kurbelgehäuse integriert und vom Trockensumpfraum durch ein oder mehrere Schottwände abgetrennt. Dabei bietet sich z.B. für einen Boxermotor aufgrund der liegend angeordneten Zylinder für die Ölrückführung in den Nasssumpf eine Lösung an, bei der ein den Trockenraum bildender Ölschottkasten im Kurbelgehäuse so angeordnet ist, dass links und rechts des Ölschottkastens (Nasssumpf-) Sammelräume für das aus dem Ölschottkasten abgesaugte Schmieröl verbleiben. Die beiden Sammelräume stehen dabei durch einen sich zwischen Ölwannendeckel und dem Boden des Ölschottkastens ausbildenden Zwischenraum miteinander in Verbindung. Zur Entschäumung bzw. Entlüftung des Schmieröls wird das aus dem Trockensumpfraum und den Zylinderköpfen abgesaugte Schmieröl über einen zentralen ÖIΛuftabscheider in den Nasssumpf gefördert.In a second advantageous embodiment, the oil sump forming the wet sump is integrated directly in the crankcase and separated from the dry sump space by one or more bulkheads. This offers for example for a boxer engine due to the horizontally arranged cylinder for the oil return to the wet sump to a solution in which a dry room forming oil bulkhead in the crankcase is arranged so that left and right of the oil pan (wet sump) collecting chambers for the from the Oil bulkhead box extracted lubricating oil remain. The two plenums communicate with each other through a gap formed between the oil sump cover and the bottom of the oil sump box. To defoam or vent the lubricating oil extracted from the dry sump chamber and the cylinder heads lubricating oil is conveyed through a central ÖIΛuftabscheider in the wet sump.
Ein weiterer Aspekt der Erfindung besteht darin, dass zur Ölrückführung in die Nasssumpf- Sammelräume um die Zylinder sich ausbildende Ringräume genutzt werden. Insbesondere bei Zylinderkurbelgehäusen in open-deck- Bauweise, bei denen der Wassermantel nur im oberen Teil der Zylinder ausgebildet ist, verbleibt ein zum Kurbelgehäuseraum hin offener Ringraum, der bei entsprechender stirnseitiger Abdichtung als Teil der Ölrückführleitung in den Nasssumpf genutzt werden kann. Da unterhalb der für die Ölrückführung genutzten Ringräume der bzw. die Nasssumpf- Sammelräume angeordnet sind, kann über entsprechende Öffnungen das Schmieröl von den Ringräumen direkt in den bzw. die Sammelräume übertreten. Damit kann weitgehend auf externe Ölleitungen verzichtet werden, so dass diese Maßnahme zu einer kompakten und preisgünstigen Umsetzung einer Brennkraftmaschine mit Trockensumpfschmierung beiträgt.Another aspect of the invention is that are used for oil return in the wet sump collecting chambers around the cylinder forming annular spaces. In particular, in cylinder crankcases in open-deck construction, in which the water jacket is formed only in the upper part of the cylinder remains an open towards the crankcase chamber annular space, which can be used with a corresponding end-side seal as part of the oil return line in the wet sump. Since the wet sump collecting chambers are arranged below the annular spaces used for oil return, the lubricating oil can pass directly from the annular spaces into the collecting space (s) via corresponding openings. This can largely be dispensed with external oil lines, so that this measure contributes to a compact and inexpensive implementation of an internal combustion engine with dry sump lubrication.
Aufgrund der liegend angeordneten Zylinder bietet es sich weiterhin an, die zur Schmierölrückführung dienenden Ringräume nach oben hin zu entlüften. Damit wird eine Entschäumung des Schmieröls erreicht und es kann auf den zuvor beschriebenen Öl/Luftabscheider ggf. verzichtet werden.Due to the horizontally arranged cylinder, it is still appropriate to vent the oil spaces used for lubricating oil return upwards. This defoaming of the lubricating oil is achieved and it may be possible to dispense with the previously described oil / air separator.
Drei Ausführungsbeispiele der Erfindung sind in der nachfolgenden Beschreibung und Zeichnung näher erläutert.Three embodiments of the invention are explained in more detail in the following description and drawings.
Es zeigen:Show it:
Fig. 1 ein Trockensumpf- Ölkreislaufschema einer Brennkraftmaschine gemäß einer ersten Ausführungsform, Fig. 2 ein Trockensumpf- Ölkreislaufschema einer Brennkraftmaschine gemäß einer zweiten Ausführungsform und Fig. 3 eine Prinzipdarstellung der Ölrückführung im Bereich der Zylinder gemäß der zweiten Ausführungsform Fig. 4 ein Trockensumpf- Ölkreislaufschema einer Brennkraftmaschine gemäß einer dritten Ausführungsform1 is a dry sump oil circuit diagram of an internal combustion engine according to a first embodiment, 2 is a dry sump oil circuit diagram of an internal combustion engine according to a second embodiment; and FIG. 3 is a schematic representation of oil return in the region of the cylinders according to the second embodiment. FIG. 4 is a dry sump oil circuit diagram of an internal combustion engine according to a third embodiment
Figur 1 zeigt das nicht auf diese Ausführungsform eingeschränkte Prinzip eines Trockensumpf - Ölkreislaufschemas für einen 6-Zylinder- Boxermotor, dessen lediglich zur Beschreibung des Ölkreislaufs erforderlichen Bauteile nachfolgend anhand der Zeichnungen näher beschrieben sind. Der Motor weist zwei Kurbelgehäusehälften 2 und 4 auf, in denen jeweils eine Zylinderbankreihe 1 bis 3 und 4 bis 6 angeordnet ist. An die beiden Zylinderbankreihen schließt sich jeweils ein Zylinderkopf 6 und 8 an, in denen der zum Betätigen der Ein- und Auslassventile erforderliche Ventiltrieb angeordnet ist. Das Kurbelgehäuse 2, 4 weist unterhalb der Lagerung für die Kurbelwelle 10 einen (Trockensumpf-) Ölabsaugraum 12 auf, in dem das zur Schmierung der Hauptlager vorgesehene Schmieröl aufgefangen wird. Dabei stellen im Motor integrierte Ölrücklaufbohrungen (nicht dargestellt) sicher, dass das Schmieröl zielgerichtet in den Ölabsaugraum 12 zurückführt wird. Ein den Ölabsaugraum 12 nach unten hin abschließender Öldeckel 14 ist doppelwandig ausgebildet, wobei der sich im Öldeckel 14 ausbildende Hohlraum 16 als (Nasssumpf-) Ölvorratsraum vorgesehen ist.Figure 1 shows the not limited to this embodiment principle of a dry sump - oil circuit diagram for a 6-cylinder boxer engine, whose only necessary for the description of the oil circuit components are described below with reference to the drawings. The engine has two crankcase halves 2 and 4, in each of which a row of cylinder banks 1 to 3 and 4 to 6 is arranged. To the two rows of cylinder banks is followed in each case by a cylinder head 6 and 8, in which the valve gear required for actuating the inlet and outlet valves is arranged. The crankcase 2, 4 has below the bearing for the crankshaft 10 to a (dry sump) Ölabsaugraum 12, in which the intended for lubrication of the main bearing lubricating oil is collected. In this case, integrated in the engine oil return holes (not shown) ensure that the lubricating oil is purposefully returned to the Ölabsaugraum 12. An oil cap 14 closing off the oil suction chamber 12 at the bottom has a double-walled construction, the cavity 16 forming in the oil cap 14 being provided as a (wet sump) oil reservoir.
Für die Trockensumpf- Druckumlaufschmierung ist eine Ölrückförderpumpe 18 vorgesehen, an deren Saugseite eine Ölabsaugleitung 20 angeschlossen ist, die zum Ölabsaugraum 12 führt. Am Ende der Ölabsaugleitung 20 ist ein Ölabsaugschnorchel 22 befestigt, der auf der oberen Öldeckelwand 14a zum Aufliegen kommt. An der Druckseite der Ölrückförderpumpe 18 ist eine Leitung 24 angeschlossen, die über einen ÖIΛuftabscheider 26, der bspw. als so genannter swirl-pot ausgebildet ist, zum Ölvorratsraum 16 führt. Über eine Zwischenwelle (nicht näher dargestellt) ist eine Hauptförderpumpe 28 angetrieben, an deren Saugseite eine Ölabsaugleitung 30 angeschlossen ist, die über eine Öffnung in der oberen Öldeckelwand 14a in den Ölvorratsraum 16 führt. Am Ende der Ölabsaugleitung 30 ist wiederum ein ölabsaugschnorchel 32 befestigt, der in der Nähe der unteren Öldeckelwand 14b platziert ist. Über die Druckseite 34 der Hauptförderpumpe 28 führen im Kurbelgehäuse 2, 4 integrierte Ölzufuhrleitungen (nicht näher dargestellt) zu den Verbrauchern, wie z.B. der Hauptlagerstellen der Kurbelwelle und der Nockenwelle. In den beiden Zylinderköpfen 6, 8 der Brennkraftmaschine sind von den Nockenwellen angetriebene Absaugpumpen 36, 38 vorgesehen, die das von der Hauptförderpumpe 28 in die Zylinderköpfe 6, 8 geförderte Schmieröl absaugen und es über Leitungen 40, 42 und den ÖIΛuftabscheider 26 ebenfalls in den Ölvorratsraum 16 zurückführen. Zur Entlüftung des Ölvorratsraumes 16 und des Kurbelgehäuses 2, 4 sind Entlüftungsleitungen 44, 46 vorgesehen, die ebenfalls an den ÖIΛuftabscheider 26 angeschlossen sind. Zur Abführung der abgeschiedenen Luft bzw. der blowby- Gase ist der Öl/Luftabscheider 26 über eine Leitung 48 mit der Sauganlage der Brennkraftmaschine verbunden. Die Trockensumpf- Druckumlaufschmierung erfolgt dabei auf folgende Art und Weise: Das im Ölabsaugraum 12 befindliche Schmieröl wird über die Ölrückförderpumpe 18 abgesaugt und in den Ölvorratsraum 16 gefördert. Von dort aus wird das Schmieröl über die Hauptförderpumpe 28 den Verbrauchern zugeführt.For the dry sump pressure circulation lubrication, an oil return pump 18 is provided, on whose suction side an oil suction line 20 is connected, which leads to the oil suction chamber 12. At the end of the oil suction line 20, an oil suction snorkel 22 is fixed, which comes to rest on the upper oil cover wall 14a. On the pressure side of the oil return pump 18, a line 24 is connected, which leads via a ÖIΛuftabscheider 26, which is formed, for example. As a so-called swirl pot to the oil reservoir 16. Via an intermediate shaft (not shown in detail), a main pump 28 is driven, on the suction side of a Ölabsaugleitung 30 is connected, which leads via an opening in the upper oil cover wall 14 a in the oil reservoir 16. At the end of the oil suction pipe 30, there is again attached an oil suction snorkel 32 placed near the lower oil lid wall 14b. Via the pressure side 34 of the main pump 28 lead in the crankcase 2, 4 integrated oil supply lines (not shown) to the consumers, such as the main bearing points of the crankshaft and the camshaft. In the two cylinder heads 6, 8 of the internal combustion engine driven by the camshafts suction pumps 36, 38 are provided which suck the pumped from the main pump 28 in the cylinder heads 6, 8 lubricating oil and it via lines 40, 42 and the ÖIΛuftabscheider 26 also in the oil reservoir 16 return. For venting of the oil reservoir 16 and the crankcase 2, 4 vent lines 44, 46 are provided, which are also connected to the ÖIΛuftabscheider 26. For discharging the separated air or blowby gases, the oil / air separator 26 is connected via a line 48 to the intake system of the internal combustion engine. The dry sump pressure circulation lubrication takes place in the following manner: The lubricating oil located in the oil suction chamber 12 is sucked off via the oil return pump 18 and conveyed into the oil reservoir 16. From there, the lubricating oil is supplied via the main pump 28 to the consumers.
Im zweiten Ausführungsbeispiel gemäß Figur 2, bei dem gleiche Bauteile mit gleichen Bezugszeichen versehen sind, wird der Trockensumpf- Ölabsaugraum 12' durch einen Ölschottkasten 50 begrenzt, an dessen beiden Seitenwände 50a und 50b (Nasssumpf-) Sammelräume 52 und 54 angrenzen. Beide Sammelräume 52, 54 stehen über einen zwischen der unteren Wandung des Ölschottkastens 50c und einem Ölwannendeckel 14' sich ausbildenden Zwischenraum 56 miteinander in Verbindung. Im Gegensatz zum ersten Ausführungsbeispiel wird das vom Ölabsaugraum 12' in die (Nasssumpf-) Sammelräume 52, 54 geförderte Schmieröl über jeweils einen die Zylinder 1 bis 3 sowie 4 bis 6 umgebenden Ringraum 58, 60 geführt, die jeweils an ihrer dem Kurbelraum zugewandten Stirnseite durch eine Dichtung 62 (nur in der linken Kurbelgehäusehälfte 2 dargestellt), z.B. in Form einer Kunststoffbrille, abgedichtet sind. Wie aus Fig. 2 und 3 erkennbar, weisen die Ringräume 58, 60 an ihren unteren Mantelflächen Öffnungen bzw. Durchbrüche 64 auf, die jeweils mit den (Nasssumpf-) Sammelräumen 52, 54 in Verbindung stehen. Der mittlere Zylinder der beiden Zylinderbankreihen 1 bis 3 bzw. 4 bis 5 6 weist jeweils einen Entlüftungsstutzen 66, 68 auf, der auf der -bezogen auf die Einbaulage der Zylinder- oberen Seite der Ringräume 58 bzw. 60 angeschlossen ist.In the second embodiment according to Figure 2, in which the same components are provided with the same reference numerals, the Trockensumpf- Ölabsaugraum 12 'is bounded by an oil bulkhead 50, on the two side walls 50a and 50b (wet sump) collecting spaces 52 and 54 adjacent. Both collecting chambers 52, 54 are connected to one another via a between the lower wall of the oil pan 50c and a sump cover 14 ' forming gap 56 with each other. In contrast to the first exemplary embodiment, the lubricating oil conveyed from the oil suction chamber 12 ' into the (wet sump) collecting chambers 52, 54 is guided via an annular space 58, 60 surrounding the cylinders 1 to 3 and 4 to 6, respectively, on their front side facing the crank chamber by a seal 62 (shown only in the left crankcase half 2), eg in the form of plastic glasses, are sealed. As can be seen from FIGS. 2 and 3, the annular spaces 58, 60 have openings or apertures 64 at their lower lateral surfaces, which are in each case in communication with the (wet sump) collecting spaces 52, 54. The middle cylinder of the two rows of cylinder banks 1 to 3 or 4 to 5 6 each have a vent pipe 66, 68, which is connected to the - related to the installation position of the cylinder upper side of the annular spaces 58 and 60 respectively.
Wie weiterhin aus Figur 2 und 3 ersichtlich, wird das aus de n Zylinderköpfen 6, 8 mit Hilfe der Absaugpumpen 36, 38 abgesaugte Schmieröl ebenfalls über die Ringräume 58, 10 60 in die Sammelräume 52, 54 gefördert. Aufgrund dieser Form der Ölrückführung kann weitgehend auf extern verlegte Ölleitungen verzichtet werden; über die Ringräume 58, 60 kann das Schmieröl entschäumt und Luft- bzw. Gasanteile über die Entlüftungsstutzen 66, 68 nach außen abgeführt werden, so dass auf separate ÖIΛuftabscheider verzichtet werden kann. Wie in Fig. 2 dargestellt, werden die Nasssumpf- Sammelräume 52, 54 15 und der Trockensumpf- Ölabsaugraum 12' über entsprechende Leitungen 70 und 72 entlüftet.As can further be seen from FIGS. 2 and 3, the lubricating oil extracted from the cylinder heads 6, 8 with the aid of the suction pumps 36, 38 is also conveyed via the annular spaces 58, 10 60 into the collecting chambers 52, 54. Due to this form of oil return can largely be dispensed with externally routed oil lines; The lubricating oil can be defoamed via the annular spaces 58, 60 and air or gas fractions can be discharged to the outside via the venting connecting pieces 66, 68, so that it is possible to dispense with separate oil-air separators. As shown in Fig. 2, the wet sump plenums 52, 54 and 15, the dry sump Ölabsaugraum 12 'are vented via corresponding lines 70 and 72.
Selbstverständlich kann die zuletzt beschriebene Ausführung der integrierten Ölrückführung über die Ringräume 58, 60 auch bei der gemäß Figur 1 beschriebenen 0 Trockensumpf- Ausführung Anwendung finden.Of course, the last-described embodiment of the integrated oil return via the annular spaces 58, 60 can also be used in the case of the dry sump design described according to FIG.
Das in Fig. 4 dargestellte dritte Ausführungsbeispiel unterscheidet sich gegenüber dem zweiten Ausführungsbeispiel (siehe Fig. 2) dadurch, dass der Ölschottkasten 50' im wesentlichen mittig im (Nasssumpf-) Ölvorratsraum angeordnet ist. Durch die damit 5 symmetrisch ausgebildeten und über den Zwischenraum 56 miteinander verbundenen Nasssumpf- Sammelräume 52, 54 ist sichergestellt, dass trotz hoher Querbeschleunigungen in beide Richtungen genügend Schmieröl im Zwischenraum 56 für die Hauptförderpumpe 28 vorhanden ist. Zwischen (Nasssumpf-) Ölvorratsraum und Trockensumpf- Ölabsaugraum 12' besteht eine Verbindung, z.B. in Form von Bohrungen, Leitungen o.a., damit auch im (Nasssumpf-) Ölvorratsraum zur Entlüftung der blowby- Gase sich ein Unterdruck einstellen kann. Zur Druckbegrenzung kann in der Verbindung ein Druckbegrenzungsventil angeordnet sein. The third embodiment shown in Fig. 4 differs from the second embodiment (see FIG. 2) in that the oil bulkhead 50 ' is arranged substantially centrally in the (wet sump) oil reservoir. By virtue of the wet sump collecting chambers 52, 54 which are thus formed symmetrically and are interconnected via the intermediate space 56, it is ensured that, despite high transverse accelerations in both directions, sufficient lubricating oil is present in the intermediate space 56 for the main delivery pump 28. Between (wet sump) oil reservoir and Trockensumpf- Ölabsaugraum 12 ' is a compound, for example in the form of holes, lines above, so that even in the (wet sump) oil reservoir for venting the blowby gases can be a negative pressure. To limit the pressure, a pressure limiting valve can be arranged in the connection.

Claims

Patentansprüche claims
1. Brennkraftmaschine mit Druckumlaufschmierung nach dem Trockensumpf - Prinzip, insbesondere für einen Boxermotor, mit einem Motorgehäuse, in dem im unteren Teil ein Ölabsaugraum (Trockensumpf) ausgebildet ist, aus dem das Schmieröl über eine mit einer Ölabsaugleitung versehene Ölrückförderpumpe zu einem Ölvorratsbehälter (Nasssumpf) gefördert wird, während das im Ölvorratsbehälter befindliche Schmieröl über eine Hauptförderpumpe zu den Verbrauchern geführt ist, dadurch gekennzeichnet, dass der den Nasssumpf bildende Ölvorratsraum (16, 52, 54, 56) ebenfalls im Motorgehäuse der Brennkraftmaschine integriert ist.1. Internal combustion engine with pressure circulation lubrication after the dry sump - principle, in particular for a boxer engine, with a motor housing in which an Ölabsaugraum (dry sump) is formed in the lower part, from which the lubricating oil via an oil suction provided with a Ölrückförderpumpe to an oil reservoir (wet sump) is promoted while the oil in the oil reservoir is guided via a main pump to the consumers, characterized in that the wet sump forming oil reservoir (16, 52, 54, 56) is also integrated in the motor housing of the internal combustion engine.
2. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Ölvorratsraum (16) unterhalb des Trockensumpfraumes (12) angeordnet ist.2. Internal combustion engine according to claim 1, characterized in that the oil reservoir (16) below the Trockensumpfraumes (12) is arranged.
3. Brennkraftmaschine, nach Anspruch 2, dadurch gekennzeichnet, dass der den Trockensumpfraum (12) nach unten hin abschließende Öldeckel (14) doppelwandig ausgebildet ist und der Hohlraum den (Nasssumpf-) Ölvorratsraum (16) bildet.3. Internal combustion engine, according to claim 2, characterized in that the dry sump space (12) downwardly closing oil cover (14) is double-walled and the cavity forms the (wet sump) oil reservoir (16).
4. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der (Nasssumpf-) Ölvorratsraum (52, 54, 56) im Kurbelgehäuse (2, 4) integriert ist, dergestalt, dass dieser durch ein oder mehrere Schottwände (50a, 50b, 50c) vom Trockensumpfraum (12') abgetrennt ist.4. Internal combustion engine according to claim 1, characterized in that the (wet sump) oil reservoir (52, 54, 56) in the crankcase (2, 4) is integrated, such that this by one or more bulkheads (50 a, 50 b, 50 c) from the dry sump space (12 ' ) is separated.
5. Brennkraftmaschine nach Anspruch 4, dadurch gekennzeichnet, dass der Ölschottkasten (50') im wesentlichen mittig im (Nasssumpf-) Ölvorratsraum (52, 54, 56) angeordnet ist.5. Internal combustion engine according to claim 4, characterized in that the oil bulkhead box (50 ' ) is arranged substantially centrally in the (wet sump) oil reservoir (52, 54, 56).
6. Brennkraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das aus dem Trockensumpfraum (12) und den Zylinderköpfen (6, 8) abgesaugte Schmieröl über einen ÖIΛuftabscheider (26) geführt ist, bevor es in den Ölvorratsraum (16) gelangt.6. Internal combustion engine according to one of the preceding claims, characterized in that the from the dry sump space (12) and the cylinder heads (6, 8) sucked lubricating oil through a ÖIΛuftabscheider (26) is guided before it enters the oil reservoir (16).
7. Brennkraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein sich um die Zylinder ausbildender Ringraum (58, 60) als Teil der Ölrückführung ausgebildet ist.7. Internal combustion engine according to one of the preceding claims, characterized in that an annular space (58, 60) forming around the cylinder is formed as part of the oil return.
8. Brennkraftmaschine nach Anspruch 7, dadurch gekennzeichnet, dass die Ringräume (58, 60) nach oben hin entlüftet sind. 8. Internal combustion engine according to claim 7, characterized in that the annular spaces (58, 60) are vented upwards.
EP05733654A 2004-06-23 2005-04-15 Internal combustion engine with lubrification by circulation of oil under pressure according to the dry sump principle Ceased EP1761687B1 (en)

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DE102004030352A1 (en) 2006-01-19
US7798289B2 (en) 2010-09-21
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US20080236950A1 (en) 2008-10-02
WO2006000268A8 (en) 2006-06-29

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