EP1961928B1 - Oil pre-filter for crankcase gas - Google Patents

Oil pre-filter for crankcase gas Download PDF

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Publication number
EP1961928B1
EP1961928B1 EP08001485.5A EP08001485A EP1961928B1 EP 1961928 B1 EP1961928 B1 EP 1961928B1 EP 08001485 A EP08001485 A EP 08001485A EP 1961928 B1 EP1961928 B1 EP 1961928B1
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EP
European Patent Office
Prior art keywords
cylinder head
space
head cover
oil
shell body
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EP08001485.5A
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German (de)
French (fr)
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EP1961928A3 (en
EP1961928A2 (en
Inventor
Frank Dieterle
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Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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Priority claimed from DE102007010308A external-priority patent/DE102007010308A1/en
Priority claimed from DE200720003094 external-priority patent/DE202007003094U1/en
Application filed by Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP1961928A2 publication Critical patent/EP1961928A2/en
Publication of EP1961928A3 publication Critical patent/EP1961928A3/en
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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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers

Definitions

  • the present invention relates to an oil pre-separator for crankcase gas of an internal combustion engine, in particular in a motor vehicle.
  • An oil separator for crankcase gases of an internal combustion engine is known, which is arranged on an inner side of a cylinder head cover.
  • the known oil separator has a housing shell, which is attached to the inside of the cylinder head cover and which receives the individual components of the oil separator.
  • the known oil separator comprises an oil pre-separator, a cyclone separator and a fine oil separator and a valve device.
  • Another oil separator is known, which is attached to the inside of a cylinder head cover.
  • This oil separator also has a housing shell for receiving the individual components of the oil separator, which have an inlet region with an inlet opening for crankcase gas and two spaced-apart oil returns, which has been deposited in an inlet oil separator or in an outlet oil separator from the crankcase gas.
  • the two returns are arranged in a central longitudinal region of a covered with the cylinder head cover cylinder head space, which is located between two each associated with a camshaft outer longitudinal regions.
  • the inlet opening is arranged above one of the camshafts, that is to say in one of the outer longitudinal regions.
  • Object of the present invention is to realize an improvement for a ⁇ lvorabscheider of the type mentioned, such as an improved separation efficiency.
  • the present invention proposes to form a pre-separation space on the inside of a cylinder head cover with the aid of a shell body.
  • this shell body has at least one inlet section with an inlet opening, which is arranged in the assembled state in a central longitudinal region of the cylinder head space. Due to this design, the respective inlet opening is located between the two outer longitudinal regions assigned to the camshafts.
  • crankcase gas can be sucked out of a fluidically calmed area of the cylinder head space, which leads to an improvement of the separation effect in the oil preseparator.
  • the respective inlet section simultaneously forms a return for oil separated in the pre-separation chamber. This has the consequence that the separated oil can drain through the inlet opening in the cylinder head space.
  • the oil separator or its shell body has a particularly simple shape, which makes the production of the oil pre-separator comparatively inexpensive.
  • the invention thus provides an oil pre-separator, which is virtually integrated in the assembled state in the cylinder head cover.
  • the present invention also relates to a combination of a cylinder head cover with an oil pre-separator.
  • the respective inlet portion may be configured so that it protrudes in the mounted state with its inlet opening via a flange of the cylinder head cover protruding into the cylinder head space.
  • the inlet opening is located comparatively deep or centrally within the cylinder head space, which favors the intake of crankcase gas from flow-dynamic favorable or calmed areas of the cylinder head space.
  • the respective inlet opening is thus located below the intermediate deck in the valve space, which separates a camshaft space containing the camshafts in the cylinder head space from a valve spring space containing springs of charge exchange valves.
  • an oil separation device comprises a plurality of different separation devices, such as an oil pre-separator and a plurality of main oil or fine oil separators configured, for example, as a cyclone, a scroll oil separator or the like.
  • this forms the only inside of the cylinder head cover arranged separating device such, having a plurality of separation devices having ⁇ labscheidevorraum.
  • the oil pre-separator according to the invention can thus simply be connected upstream of a conventional oil separation device in order to improve its effectiveness. At the same time, such an oil pre-separator can serve as an oil return for downstream oil separators.
  • a Vorabscheideraum which is formed with the aid of the shell body inside of the cylinder head cover, at least one outlet opening for crankcase gas, which is formed in the cylinder head cover.
  • a conventional ⁇ labscheidevorraum be connected to the cylinder head cover, whereby the ⁇ lvorabscheider invention is automatically preceded.
  • an oil pre-separator 1 comprises a shell body 2 which, for the purpose of forming the oil pre-separator 1 on an inner side 3 of a cylinder head cover 4, has a housing body Fig. 3 indicated internal combustion engine 5 is arranged.
  • the ⁇ lvorabscheider 1 is used in the operation of the internal combustion engine 5, which is preferably arranged in a motor vehicle, to excrete oil from crankcase gas.
  • This crankcase gas or blowby gas is thereby using a crankcase ventilation device, not shown here, from a crankcase of the internal combustion engine 5 or from a in Fig. 3 only partially shown cylinder head 6 of the internal combustion engine 5 sucked.
  • Such a venting device is usually equipped with a ⁇ labscheidevorraum also not shown here, which makes it possible to excrete in the crankcase gas entrained oil and return the crankcase.
  • ⁇ labscheidevoriques may have a plurality of separation devices.
  • One of these separation devices can be formed by the oil pre-separator 1 shown here.
  • the oil pre-separator 1 forms the only inside of the cylinder head cover 4 arranged separating such a ⁇ labscheidevorraum.
  • the oil pre-separator 1 is connected upstream of the other separation devices.
  • the shell body 2 has at least one inlet section 9, via the crankcase gas from one of the cylinder head cover 4 covered, in Fig. 3 recognizable cylinder head space 10 can enter the pre-separation chamber 8.
  • the shell body 2 has three such inlet sections 9.
  • Each inlet section 9 has an inlet opening 11, through which the crankcase gas passes from the cylinder head space 10 via the respective inlet section 9 into the pre-separation chamber 8.
  • the respective inlet section 9 has a flow cross-section which increases from the respective inlet opening 11 to the pre-separation chamber 8.
  • the entire inlet section 9 has a relatively large cross-sectional area, resulting in relatively low flow velocities through which only comparatively little oil or oil mist can be entrained with the crankcase gas flow.
  • the comparatively large cross section of the respective inlet section 9 causes oil from a film of oil forming on the inner surface of the respective inlet section 9, which can be caused by returning oil, not to be torn by the crankcase gas flow.
  • the flow cross section tapers to the respective inlet opening 11.
  • the inlet sections 9 are designed in the shell body 2 so that they simultaneously form a return for oil, which has been separated from the oil preseparator 1 and optionally from other downstream separators. This means that the separated oil can flow off along the respective inlet section 9 in the direction of the cylinder head space 10 and ultimately drip off into the cylinder head space 10 through the respective inlet opening 11.
  • the ⁇ lvorabscheider 1 can thus be formed with only a single component, namely with the shell body 2 in that the shell body 2 is installed in the cylinder head cover 4.
  • the shell body 2 is made of one piece, so that in particular the inlet portions 9 and the clip elements 12 are integrally formed on the shell body 2.
  • the respective inlet section 9 is designed such that the associated inlet opening 11 in the mounted state according to Fig. 3 in the cylinder head space 10 in a central longitudinal region 14 which is located between two outer longitudinal regions 15.
  • Each of these longitudinal regions 15 is associated with a camshaft 16 indicated only symbolically here.
  • one camshaft 16 controls intake valves while the other camshaft 16 controls exhaust valves.
  • the axes of rotation of the camshafts 16 define the longitudinal direction of the cylinder head cover 4 and the shell body 2.
  • the inlet portions 9 may preferably be configured so that the respective inlet portion 9 protrudes in the assembled state with the associated inlet opening 11 via a flange 17 of the cylinder head cover 4 and projects into the cylinder head space 10.
  • the camshafts 16 are arranged in the cylinder head space 10 in a region which can also be referred to as a camshaft space 20.
  • This camshaft space 20 may be separated within the cylinder head space 10 by an intermediate deck 21 of a valve spring chamber 22, in which usually not shown return springs of the charge exchange valves, also not shown are arranged.
  • the storage is usually not shown bucket tappets of the charge exchange valves.
  • the oil pre-separator 1 thereby sucks in crankcase gas having a relatively low oil content.
  • the inlet section 9 protrudes so far into the cylinder head space 10 that its inlet opening 11 is approximately at the level of the intermediate deck 21 or even extends through a plane in which the intermediate deck 21 extends, and thereby into the Valve spring chamber 22 hineinerstreckt.
  • the respective inlet opening 11 of the cylinder head cover 4 is further away than the camshaft 16 in this construction.
  • the inlet portions 9 may expediently be configured or arranged on the shell body 2 that they extend within the central longitudinal region 14 each between two ignition devices.
  • the abovementioned ignition devices are not illustrated, however, 4 shafts or domes 18 are formed on the cylinder head cover, by means of which the abovementioned ignition devices can be attached to the internal combustion engine 5.
  • the proposed embodiment of the respective inlet section 9, such that the associated inlet opening 11 is arranged in the central longitudinal section 14, protrudes in particular over the Zylinderkopfhaubenflansch 17 protruding into the cylinder head space 10, preferably positioned below the camshaft 16 is, allows the intake of crankcase gas from a fluidically calmed area, for example in the spring chamber or sub-decks.
  • the suction of crankcase gas from such a calmed flow area leads to an improvement in the efficiency of the oil pre-separator 1.
  • the preseparation space 8 has at least one outlet opening 19 for crankcase gas.
  • This outlet opening 19 is according to Fig. 2 preferably formed in the cylinder head cover 4.
  • the above-mentioned crankcase ventilation device or its ⁇ labscheidevoriques be connected via the outlet opening 19 to the ⁇ lvorabscheider 1.
  • the shell body 2 itself has no outlet for crankcase gas. This means that the crankcase gas can escape from the pre-separation chamber 8 only through the outlet opening 19 of the cylinder head cover 4.
  • the shell body 2 may be configured as an injection molded part or as a diecast part.
  • the shell body 2 may be made of plastic or of metal or of light metal.
  • each of these cylinder head covers 4 can be equipped with such an oil pre-separator 1.
  • the shell body 2 of the two ⁇ lvorabscheider 1 are designed as equal parts, so that only one type of shell bodies 2 must be made, which is usable in both cylinder banks.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

Die vorliegende Erfindung betrifft einen Ölvorabscheider für Kurbelgehäusegas einer Brennkraftmaschine, insbesondere in einem Kraftfahrzeug.The present invention relates to an oil pre-separator for crankcase gas of an internal combustion engine, in particular in a motor vehicle.

Aus der DE 101 27 819 A1 ist ein Ölabscheider für Kurbetgehäusegase einer Brennkraftmaschine bekannt, der an einer Innenseite einer Zylinderkopfhaube angeordnet ist. Der bekannte Ölabscheider weist eine Gehäuseschale auf, die an der Innenseite der Zylinderkopfhaube befestigt ist und die die einzelnen Komponenten des Ölabscheiders aufnimmt. Der bekannte Ölabscheider umfasst einen Ölvorabscheider, einen Zyklonabscheider und einen Ölfeinabscheider sowie eine Ventileinrichtung.From the DE 101 27 819 A1 An oil separator for crankcase gases of an internal combustion engine is known, which is arranged on an inner side of a cylinder head cover. The known oil separator has a housing shell, which is attached to the inside of the cylinder head cover and which receives the individual components of the oil separator. The known oil separator comprises an oil pre-separator, a cyclone separator and a fine oil separator and a valve device.

Aus der US 2005/0092267 A1 ist ein weiterer Ölabscheider bekannt, der an der Innenseite einer Zylinderkopfhaube angebracht ist. Dieser Ölabscheider besitzt ebenfalls eine Gehäuseschale zur Aufnahme der einzelnen Komponenten des Ölabscheiders, die einen Einlassbereich mit einer Einlassöffnung für Kurbelgehäusegas sowie zwei davon beabstandete Rückläufe für Öl aufweisen, das in einem Einlass-Ölabscheider beziehungsweise in einem Auslass-Ölabscheider aus dem Kurbelgehäusegas abgeschieden worden ist. Dabei sind die beiden Rückläufe in einem mittleren Längsbereich eines mit der Zylinderkopfhaube abgedeckten Zylinderkopfraums angeordnet, der sich zwischen zwei jeweils einer Nockenwelle zugeordneten äußeren Längsbereichen befindet. Somit kann das abgeschiedene Öl zwischen den beiden Nockenwellen in den Zylinderkopfraum zurücktropfen. Die Einlassöffnung ist dabei oberhalb einer der Nockenwellen, also in einem der äußeren Längsbereiche angeordnet.From the US 2005/0092267 A1 Another oil separator is known, which is attached to the inside of a cylinder head cover. This oil separator also has a housing shell for receiving the individual components of the oil separator, which have an inlet region with an inlet opening for crankcase gas and two spaced-apart oil returns, which has been deposited in an inlet oil separator or in an outlet oil separator from the crankcase gas. The two returns are arranged in a central longitudinal region of a covered with the cylinder head cover cylinder head space, which is located between two each associated with a camshaft outer longitudinal regions. Thus, the separated oil can drip back into the cylinder head space between the two camshafts. The inlet opening is arranged above one of the camshafts, that is to say in one of the outer longitudinal regions.

Aus der JP 2 022612 oder JP H05 6116 U ist ein Ölvorabscheider bekannt, bei dem die Einlassöffnung zwischen zwei Nockenwellen positioniert und oberhalb eines Ventilfederraums angeordnet ist.From the JP 2 022612 or JP H05 6116 U An oil pre-separator is known in which the inlet port is positioned between two camshafts and disposed above a valve spring chamber.

Aufgabe der vorliegenden Erfindung ist es, für einen Ölvorabscheider der eingangs genannten Art eine Verbesserung zu realisieren, wie zum Beispiel eine verbesserte Abscheidewirkung.Object of the present invention is to realize an improvement for a Ölvorabscheider of the type mentioned, such as an improved separation efficiency.

Die Erfindung löst diese Aufgabe durch den Gegenstand des Anspruchs 1. Die Unteransprüche beschreiben bevorzugte Ausführungsformen.The invention solves this problem by the subject matter of claim 1. The dependent claims describe preferred embodiments.

Allgemein schlägt die vorliegende Erfindung vor, an der Innenseite einer Zylinderkopfhaube mit Hilfe eines Schalenkörpers einen Vorabscheideraum auszubilden. Dabei weist dieser Schalenkörper zumindest einen Einlassabschnitt mit einer Einlassöffnung auf, die im montierten Zustand in einem mittleren Längsbereich des Zylinderkopfraums angeordnet ist. Durch diese Bauweise befindet sich die jeweilige Einlassöffnung zwischen den beiden den Nockenwellen zugeordneten äußeren Längsbereichen. Dies hat den Vorteil, dass Kurbelgehäusegas aus einem strömungstechnisch beruhigten Bereich des Zylinderkopfraums abgesaugt werden kann, was zu einer Verbesserung der Abscheidewirkung im Ölvorabscheider führt. Bemerkenswert ist ferner, dass der jeweilige Einlassabschnitt gleichzeitig einen Rücklauf für im Vorabscheideraum abgeschiedenes Öl bildet. Dies hat zur Folge, dass das abgeschiedene Öl durch die Einlassöffnung in den Zylinderkopfraum abtropfen kann. Hierdurch besitzt der Ölabscheider beziehungsweise dessen Schalenkörper eine besonders einfache Form, was die Herstellung des Ölvorabscheiders vergleichsweise preiswert macht.In general, the present invention proposes to form a pre-separation space on the inside of a cylinder head cover with the aid of a shell body. In this case, this shell body has at least one inlet section with an inlet opening, which is arranged in the assembled state in a central longitudinal region of the cylinder head space. Due to this design, the respective inlet opening is located between the two outer longitudinal regions assigned to the camshafts. This has the advantage that crankcase gas can be sucked out of a fluidically calmed area of the cylinder head space, which leads to an improvement of the separation effect in the oil preseparator. It is also noteworthy that the respective inlet section simultaneously forms a return for oil separated in the pre-separation chamber. This has the consequence that the separated oil can drain through the inlet opening in the cylinder head space. As a result, the oil separator or its shell body has a particularly simple shape, which makes the production of the oil pre-separator comparatively inexpensive.

Durch die Erfindung wird somit ein Ölvorabscheider bereitgestellt, der im montierten Zustand quasi in die Zylinderkopfhaube integriert ist. Insoweit betrifft die vorliegende Erfindung auch eine Kombination einer Zylinderkopfhaube mit einem Ölvorabscheider.The invention thus provides an oil pre-separator, which is virtually integrated in the assembled state in the cylinder head cover. In that regard, the present invention also relates to a combination of a cylinder head cover with an oil pre-separator.

Bei einer bevorzugten Ausführungsform kann der jeweilige Einlassabschnitt so ausgestaltet sein, dass er im montierten Zustand mit seiner Einlassöffnung über einen Flansch der Zylinderkopfhaube vorstehend in den Zylinderkopfraum hineinragt. Durch diese Bauweise befindet sich die Einlassöffnung vergleichsweise tief oder zentral innerhalb des Zylinderkopfraums, was die Ansaugung von Kurbelgehäusegas aus strömungsdynamisch günstigen oder beruhigten Bereichen des Zylinderkopfraums begünstigt. Erfindungsgemäß befindet sich die jeweilige Einlassöffnung somit unterhalb des Zwischendecks im Ventilraum, das im Zylinderkopfraum einen die Nockenwellen enthaltenden Nockenwellenraum von einem Federn von Ladungswechselventilen enthaltenden Ventilfederraum trennt. Vorzugsweise umfasst eine Ölabscheidevorrichtung mehrere verschiedene Abscheideeinrichtungen, wie zum Beispiel einen Ölvorabscheider und mehrere Ölhaupt- oder Ölfeinabscheider, die zum Beispiel als Zyklon, Spiralölabscheider oder dergleichen ausgestaltet sind. Gemäß einer bevorzugten Ausführungsform des erfindungsgemäßen Ölvorabscheiders bildet dieser die einzige innen an der Zylinderkopfhaube angeordnete Abscheideeinrichtung einer derartigen, mehrere Abscheideeinrichtungen aufweisenden Ölabscheidevorrichtung. Insbesondere kann so der erfindungsgemäße Ölvorabscheider einfach einer konventionellen Ölabscheidevorrichtung vorgeschaltet werden, um deren Effektivität zu verbessern. Gleichzeitig kann ein derartige Ölvorabscheider als Ölrücklauf für nachgeordnete Ölabscheider dienen.In a preferred embodiment, the respective inlet portion may be configured so that it protrudes in the mounted state with its inlet opening via a flange of the cylinder head cover protruding into the cylinder head space. As a result of this construction, the inlet opening is located comparatively deep or centrally within the cylinder head space, which favors the intake of crankcase gas from flow-dynamic favorable or calmed areas of the cylinder head space. According to the invention, the respective inlet opening is thus located below the intermediate deck in the valve space, which separates a camshaft space containing the camshafts in the cylinder head space from a valve spring space containing springs of charge exchange valves. Preferably, an oil separation device comprises a plurality of different separation devices, such as an oil pre-separator and a plurality of main oil or fine oil separators configured, for example, as a cyclone, a scroll oil separator or the like. According to a preferred embodiment of the oil pre-separator according to the invention, this forms the only inside of the cylinder head cover arranged separating device such, having a plurality of separation devices having Ölabscheidevorrichtung. In particular, the oil pre-separator according to the invention can thus simply be connected upstream of a conventional oil separation device in order to improve its effectiveness. At the same time, such an oil pre-separator can serve as an oil return for downstream oil separators.

Gemäß einer bevorzugten Ausführungsform kann ein Vorabscheideraum, der mit Hilfe des Schalenkörpers innen an der Zylinderkopfhaube ausgebildet ist, zumindest eine Auslassöffnung für Kurbelgehäusegas aufweisen, die in der Zylinderkopfhaube ausgebildet ist. Besonders vorteilhaft ist dabei eine Weiterbildung, bei welcher der Schalenkörper selbst keine Auslassöffnung für Kurbelgehäusegas aufweist. Somit kann beispielsweise eine konventionelle Ölabscheidevorrichtung an die Zylinderkopfhaube angeschlossen werden, wodurch der erfindungsgemäße Ölvorabscheider automatisch vorgeschaltet wird.According to a preferred embodiment, a Vorabscheideraum, which is formed with the aid of the shell body inside of the cylinder head cover, at least one outlet opening for crankcase gas, which is formed in the cylinder head cover. Particularly advantageous is a development in which the shell body itself has no outlet for crankcase gas. Thus, for example, a conventional Ölabscheidevorrichtung be connected to the cylinder head cover, whereby the Ölvorabscheider invention is automatically preceded.

Andere Merkmale und Vorteile der Erfindung werden in den Unteransprüchen, den Zeichnungen und der zugehörigen Figurenbeschreibung anhand der Zeichnungen erläutert.Other features and advantages of the invention will be explained in the dependent claims, the drawings and the associated description of the figures with reference to the drawings.

Die folgende Figurenbeschreibung dient zur Erläuterung bevorzugter Ausführungsbeispiele der Erfindung, wobei gleiche Bezugszeichen gleiche oder ähnliche Bauteile bezeichnen.

Fig. 1
zeigt eine perspektivische Ansicht von Ihnen auf eine Zylinderkopfhaube mit einem Ölvorabscheider,
Fig. 2
zeigt eine perspektivische Ansicht von außen auf die Zylinderkopfhaube aus Fig. 1,
Fig. 3
zeigt eine Darstellung des Ölvorabscheiders bei am Zylinderkopf montierter Zylinderkopfhaube, wobei die Zylinderkopfhaube und der Zylinderkopf nur teilweise und stark vereinfacht geschnitten dargestellt sind.
The following description of figures serves to explain preferred embodiments of the invention, wherein the same reference numerals designate the same or similar components.
Fig. 1
shows a perspective view of you on a cylinder head cover with an oil pre-separator,
Fig. 2
shows a perspective view from the outside on the cylinder head cover Fig. 1 .
Fig. 3
shows a representation of the Ölvorabscheiders mounted on the cylinder head cylinder head cover, the cylinder head cover and the cylinder head are shown only partially and greatly simplified cut.

Entsprechend Fig. 1 umfasst ein Ölvorabscheider 1 einen Schalenkörper 2, der zur Ausbildung des Ölvorabscheiders 1 an einer Innenseite 3 einer Zylinderkopfhaube 4 einer in Fig. 3 angedeuteten Brennkraftmaschine 5 angeordnet ist. Der Ölvorabscheider 1 dient im Betrieb der Brennkraftmaschine 5, die vorzugsweise in einem Kraftfahrzeug angeordnet ist, dazu, Öl aus Kurbelgehäusegas auszuscheiden. Dieses Kurbelgehäusegas oder BlowBy-Gas wird dabei mit Hilfe einer hier nicht dargestellten Kurbelgehäuseentlüftungseinrichtung aus einem Kurbelgehäuse der Brennkraftmaschine 5 beziehungsweise aus einem in Fig. 3 nur teilweise dargestellten Zylinderkopf 6 der Brennkraftmaschine 5 abgesaugt. Eine derartige Entlüftungseinrichtung ist üblicherweise mit einer hier ebenfalls nicht näher dargestellten Ölabscheidevorrichtung ausgestattet, die es ermöglicht, im Kurbelgehäusegas mitgeführtes Öl auszuscheiden und dem Kurbelgehäuse rückzuführen. Eine derartige Ölabscheidevorrichtung kann mehrere Abscheideeinrichtungen aufweisen. Eine diese Abscheideeinrichtungen kann durch den hier gezeigten Ölvorabscheider 1 gebildet sein. Bei der hier gezeigten, bevorzugten Ausführungsform bildet der Ölvorabscheider 1 die einzige innen an der Zylinderkopfhaube 4 angeordnete Abscheideeinrichtung einer solchen Ölabscheidevorrichtung.Corresponding Fig. 1 For example, an oil pre-separator 1 comprises a shell body 2 which, for the purpose of forming the oil pre-separator 1 on an inner side 3 of a cylinder head cover 4, has a housing body Fig. 3 indicated internal combustion engine 5 is arranged. The Ölvorabscheider 1 is used in the operation of the internal combustion engine 5, which is preferably arranged in a motor vehicle, to excrete oil from crankcase gas. This crankcase gas or blowby gas is thereby using a crankcase ventilation device, not shown here, from a crankcase of the internal combustion engine 5 or from a in Fig. 3 only partially shown cylinder head 6 of the internal combustion engine 5 sucked. Such a venting device is usually equipped with a Ölabscheidevorrichtung also not shown here, which makes it possible to excrete in the crankcase gas entrained oil and return the crankcase. Such Ölabscheidevorrichtung may have a plurality of separation devices. One of these separation devices can be formed by the oil pre-separator 1 shown here. In the preferred embodiment shown here, the oil pre-separator 1 forms the only inside of the cylinder head cover 4 arranged separating such a Ölabscheidevorrichtung.

Dementsprechend ist der Ölvorabscheider 1 den anderen Abscheideeinrichtungen vorgeschaltet.Accordingly, the oil pre-separator 1 is connected upstream of the other separation devices.

Im montierten Zustand deckt der Schalenkörper 2 an der Innenseite 3 der Zylinderkopfhaube 4 einen Wandabschnitt 7 der Zylinderkopfhaube 4 ab und begrenzt mit diesem abgedeckten Wandabschnitt 7 einen Vorabscheideraum 8 des Ölvorabscheiders 1.In the assembled state covers the shell body 2 on the inside 3 of the cylinder head cover 4 from a wall portion 7 of the cylinder head cover 4 and limited with this covered wall portion 7 a pre-separation chamber 8 of Ölvorabscheiders. 1

Der Schalenkörper 2 weist zumindest einen Einlassabschnitt 9 auf, über den Kurbelgehäusegas aus einem von der Zylinderkopfhaube 4 abgedeckten, in Fig. 3 erkennbaren Zylinderkopfraum 10 in den Vorabscheideraum 8 eintreten kann. Im gezeigten, bevorzugten Beispiel weist der Schalenkörper 2 drei derartige Einlassabschnitte 9 auf. Jeder Einlassabschnitt 9 weist eine Einlassöffnung 11 auf, durch die das Kurbelgehäusegas aus dem Zylinderkopfraum 10 über den jeweiligen Einlassabschnitt 9 in den Vorabscheideraum 8 gelangt. Der jeweilige Einlassabschnitt 9 besitzt einen Strömungsquerschnitt, der von der jeweiligen Einlassöffnung 11 bis zum Vorabscheideraum 8 hin zunimmt. Der gesamte Einlassabschnitt 9 weist eine relativ große Querschnittsfläche auf, wodurch sich relativ geringe Strömungsgeschwindigkeiten ergeben, durch die nur vergleichsweise wenig Öl bzw. Ölnebel mit der Kurbelgehäusegasströmung mitgerissen werden kann. Gleichzeitig bewirkt der vergleichsweise große Querschnitt des jeweiligen Einlassabschnittes 9, dass Öl aus einem sich an der Innenfläche des jeweiligen Einlassabschnittes 9 ausbildenden Ölfilm, der durch rücklaufendes Öl entstehen kann, nicht von der Kurbelgehäusegasströmung mit gerissen wird. In einer in Fig. 3 erkennbaren Querrichtung kann der jeweilige Einlassabschnitt 9 insbesondere eine trichterförmige Gestalt aufweisen, deren Strömungsquerschnitt sich zur jeweiligen Einlassöffnung 11 hin verjüngt. Zum Anbringen des Schalenkörpers 2 an der Zylinderkopfhaube 4 ist der Schalenkörper 2 mit Clipselementen 12 versehen, mit deren Hilfe der Schalenkörper 2 an der Zylinderkopfhaube 4 einclipsbar ist. Die Zylinderkopfhaube 4 weist hierzu komplementäre Clipskonturen 13 auf, die zum Einclipsen des Schalenkörpers 2 mit den Clipselementen 12 zusammenwirken. Durch die Verclipsung lässt sich der Schalenkörper 2 vergleichsweise rasch und sicher an der Zylinderkopfhaube 4 montieren. Für die Befestigung des Schalenkörpers 2 an der Zylinderkopfhaube 4 und insbesondere für die Abdichtung des Vorabscheideraums 8 ist zusätzlich eine Verklebung vorgesehen. Die Einlassabschnitte 9 sind beim Schalenkörper 2 so ausgestaltet, dass sie gleichzeitig jeweils einen Rücklauf für Öl bilden, das vom Ölvorabscheider 1 und gegebenenfalls von anderen nachgeordneten Abscheidern abgeschieden worden ist. Das bedeutet, dass das abgeschiedene Öl entlang des jeweiligen Einlassabschnitts 9 in Richtung Zylinderkopfraum 10 abfließen und letztlich durch die jeweilige Einlassöffnung 11 in den Zylinderkopfraum 10 abtropfen kann.The shell body 2 has at least one inlet section 9, via the crankcase gas from one of the cylinder head cover 4 covered, in Fig. 3 recognizable cylinder head space 10 can enter the pre-separation chamber 8. In the illustrated preferred example, the shell body 2 has three such inlet sections 9. Each inlet section 9 has an inlet opening 11, through which the crankcase gas passes from the cylinder head space 10 via the respective inlet section 9 into the pre-separation chamber 8. The respective inlet section 9 has a flow cross-section which increases from the respective inlet opening 11 to the pre-separation chamber 8. The entire inlet section 9 has a relatively large cross-sectional area, resulting in relatively low flow velocities through which only comparatively little oil or oil mist can be entrained with the crankcase gas flow. At the same time, the comparatively large cross section of the respective inlet section 9 causes oil from a film of oil forming on the inner surface of the respective inlet section 9, which can be caused by returning oil, not to be torn by the crankcase gas flow. In an in Fig. 3 recognizable transverse direction of the respective inlet portion 9 may in particular have a funnel-shaped shape, the flow cross section tapers to the respective inlet opening 11. For attaching the shell body 2 to the cylinder head cover 4 of the shell body 2 is provided with clip elements 12, by means of which the shell body 2 is clipped to the cylinder head cover 4. For this purpose, the cylinder head cover 4 has complementary clip contours 13 which are used for clipping the shell body 2 with the clip elements 12 interact. By clipping the shell body 2 can be relatively quickly and safely mounted on the cylinder head cover 4. For the attachment of the shell body 2 to the cylinder head cover 4 and in particular for the sealing of Vorabscheideraums 8 an adhesive bond is additionally provided. The inlet sections 9 are designed in the shell body 2 so that they simultaneously form a return for oil, which has been separated from the oil preseparator 1 and optionally from other downstream separators. This means that the separated oil can flow off along the respective inlet section 9 in the direction of the cylinder head space 10 and ultimately drip off into the cylinder head space 10 through the respective inlet opening 11.

Der Ölvorabscheider 1 kann somit mit nur einem einzigen Bauteil, nämlich mit dem Schalenkörper 2 dadurch gebildet werden, dass der Schalenkörper 2 in die Zylinderkopfhaube 4 eingebaut wird. Bevorzugt ist dabei der Schalenkörper 2 aus einem Stück hergestellt, so dass insbesondere die Einlassabschnitte 9 und die Clipselemente 12 integral am Schalenkörper 2 ausgebildet sind.The Ölvorabscheider 1 can thus be formed with only a single component, namely with the shell body 2 in that the shell body 2 is installed in the cylinder head cover 4. Preferably, the shell body 2 is made of one piece, so that in particular the inlet portions 9 and the clip elements 12 are integrally formed on the shell body 2.

Des weiteren ist der jeweilige Einlassabschnitt 9 so ausgestaltet, dass sich die zugehörige Einlassöffnung 11 im montierten Zustand gemäß Fig. 3 im Zylinderkopfraum 10 in einem mittleren Längsbereich 14 befindet, der sich zwischen zwei äußeren Längsbereichen 15 befindet. Jedem dieser Längsbereiche 15 ist eine hier jeweils nur symbolisch angedeutete Nockenwelle 16 zugeordnet. Beispielsweise steuert die eine Nockenwelle 16 Einlassventile, während die andere Nockenwelle 16 Auslassventile steuert. Die Rotationsachsen der Nockenwellen 16 definieren dabei die Längsrichtung der Zylinderkopfhaube 4 beziehungsweise des Schalenkörpers 2. Wie insbesondere Fig. 3 ferner entnehmbar ist, können die Einlassabschnitte 9 vorzugsweise so ausgestaltet sein, dass der jeweilige Einlassabschnitt 9 im montieren Zustand mit der zugehörigen Einlassöffnung 11 über einen Flansch 17 der Zylinderkopfhaube 4 vorsteht und in den Zylinderkopfraum 10 hineinragt.Furthermore, the respective inlet section 9 is designed such that the associated inlet opening 11 in the mounted state according to Fig. 3 in the cylinder head space 10 in a central longitudinal region 14 which is located between two outer longitudinal regions 15. Each of these longitudinal regions 15 is associated with a camshaft 16 indicated only symbolically here. For example, one camshaft 16 controls intake valves while the other camshaft 16 controls exhaust valves. The axes of rotation of the camshafts 16 define the longitudinal direction of the cylinder head cover 4 and the shell body 2. As in particular Fig. 3 can also be removed, the inlet portions 9 may preferably be configured so that the respective inlet portion 9 protrudes in the assembled state with the associated inlet opening 11 via a flange 17 of the cylinder head cover 4 and projects into the cylinder head space 10.

Die Nockenwellen 16 sind im Zylinderkopfraum 10 in einem Bereich angeordnet, der auch als Nockenwellenraum 20 bezeichnet werden kann. Dieser Nockenwellenraum 20 kann innerhalb des Zylinderkopfraums 10 durch ein Zwischendeck 21 von einem Ventilfederraum 22 getrennt sein, in dem üblicherweise nicht gezeigte Rückstellfedern der ebenfalls nicht gezeigten Ladungswechselventile angeordnet sind. An besagtem Zwischendeck 21, das teilweise auch als Ölgalerie bezeichnet wird, erfolgt in der Regel die Lagerung nicht gezeigter Tassenstößel der Ladungswechselventile. Im Bereich dieses Zwischendecks 21 bzw. im Ventilfederraum 22 existiert vergleichsweise wenig Spritzöl. Der Ölvorabscheider 1 saugt dadurch Kurbelgehäusegas mit einem relativ geringen Ölgehalt an.The camshafts 16 are arranged in the cylinder head space 10 in a region which can also be referred to as a camshaft space 20. This camshaft space 20 may be separated within the cylinder head space 10 by an intermediate deck 21 of a valve spring chamber 22, in which usually not shown return springs of the charge exchange valves, also not shown are arranged. At said intermediate deck 21, which is also sometimes referred to as oil gallery, the storage is usually not shown bucket tappets of the charge exchange valves. In the area of this intermediate deck 21 or in the valve spring space 22 there is comparatively little spray oil. The oil pre-separator 1 thereby sucks in crankcase gas having a relatively low oil content.

In dem in Fig. 3 gezeigten Beispiel ragt der Einlassabschnitt 9 so weit in den Zylinderkopfraum 10 hinein, dass sich seine Einlassöffnung 11 etwa auf der Höhe des Zwischendecks 21 befindet oder sich sogar durch eine Ebene hindurch erstreckt, in der sich das Zwischendeck 21 erstreckt, und sich dadurch bis in den Ventilfederraum 22 hineinerstreckt. In jedem Fall ist bei dieser Bauweise die jeweilige Einlassöffnung 11 von der Zylinderkopfhaube 4 weiter entfernt als die Nockenwellen 16.In the in Fig. 3 In the example shown, the inlet section 9 protrudes so far into the cylinder head space 10 that its inlet opening 11 is approximately at the level of the intermediate deck 21 or even extends through a plane in which the intermediate deck 21 extends, and thereby into the Valve spring chamber 22 hineinerstreckt. In any case, the respective inlet opening 11 of the cylinder head cover 4 is further away than the camshaft 16 in this construction.

Wie insbesondere Fig. 1 entnehmbar ist, können die Einlassabschnitte 9 zweckmäßig auch so ausgestaltet bzw. am Schalenkörper 2 angeordnet sein, dass sie sich innerhalb des mittleren Längsbereichs 14 jeweils zwischen zwei Zündeinrichtungen erstrecken. In Fig. 1 sind die genannten Zündeinrichtungen nicht dargestellt, jedoch sind an der Zylinderkopfhaube 4 Schächte oder Dome 18 ausgebildet, durch die die genannten Zündeinrichtungen an der Brennkraftmaschine 5 anbringbar sind.In particular Fig. 1 can be removed, the inlet portions 9 may expediently be configured or arranged on the shell body 2 that they extend within the central longitudinal region 14 each between two ignition devices. In Fig. 1 If the abovementioned ignition devices are not illustrated, however, 4 shafts or domes 18 are formed on the cylinder head cover, by means of which the abovementioned ignition devices can be attached to the internal combustion engine 5.

Die vorgeschlagene Ausgestaltung des jeweiligen Einlassabschnitts 9, dergestalt, dass die zugehörige Einlassöffnung 11 im mittleren Längsabschnitt 14 angeordnet ist, insbesondere über den Zylinderkopfhaubenflansch 17 vorstehend in den Zylinderkopfraum 10 hineinragt, vorzugsweise unterhalb der Nockenwellen 16 positioniert ist, ermöglicht die Ansaugung von Kurbelgehäusegas aus einem strömungstechnisch beruhigten Gebiet, beispielsweise im Bereich des Federraums oder Zwischendecks. Die Ansaugung von Kurbelgehäusegas aus einem derartigen beruhigten Strömungsbereich führt zu einer Verbesserung des Wirkungsgrads des Ölvorabscheiders 1.The proposed embodiment of the respective inlet section 9, such that the associated inlet opening 11 is arranged in the central longitudinal section 14, protrudes in particular over the Zylinderkopfhaubenflansch 17 protruding into the cylinder head space 10, preferably positioned below the camshaft 16 is, allows the intake of crankcase gas from a fluidically calmed area, for example in the spring chamber or sub-decks. The suction of crankcase gas from such a calmed flow area leads to an improvement in the efficiency of the oil pre-separator 1.

Der Vorabscheidraum 8 weist zumindest eine Auslassöffnung 19 für Kurbelgehäusegas auf. Diese Auslassöffnung 19 ist gemäß Fig. 2 bevorzugt in der Zylinderkopfhaube 4 ausgebildet. Somit kann die weiter oben genannte Kurbelgehäuseentlüftungseinrichtung bzw. deren Ölabscheidevorrichtung über die Auslassöffnung 19 an den Ölvorabscheider 1 angeschlossen werden. Vorzugsweise besitzt der Schalenkörper 2 selbst keine Auslassöffnung für Kurbelgehäusegas. Das bedeutet, dass das Kurbelgehäusegas nur durch die Auslassöffnung 19 der Zylinderkopfhaube 4 aus dem Vorabscheideraum 8 austreten kann.The preseparation space 8 has at least one outlet opening 19 for crankcase gas. This outlet opening 19 is according to Fig. 2 preferably formed in the cylinder head cover 4. Thus, the above-mentioned crankcase ventilation device or its Ölabscheidevorrichtung be connected via the outlet opening 19 to the Ölvorabscheider 1. Preferably, the shell body 2 itself has no outlet for crankcase gas. This means that the crankcase gas can escape from the pre-separation chamber 8 only through the outlet opening 19 of the cylinder head cover 4.

Der Schalenkörper 2 kann als Spritzgussteil oder als Druckgussteil ausgestaltet sein. Der Schalenkörper 2 kann aus Kunststoff oder aus Metall beziehungsweise aus Leichtmetall hergestellt sein.The shell body 2 may be configured as an injection molded part or as a diecast part. The shell body 2 may be made of plastic or of metal or of light metal.

Sofern die Brennkraftmaschine 5 zwei Zylinderbänke aufweist, die jeweils mit einer eigenen Zylinderkopfhaube 4 versehen sind, kann jede dieser Zylinderkopfhauben 4 mit einem derartigen Ölvorabscheider 1 ausgestattet sein. Besonders vorteilhaft ist dabei eine Ausführungsform, bei welcher die Schalenkörper 2 der beiden Ölvorabscheider 1 als Gleichteile ausgestaltet sind, so dass nur eine Art von Schalenkörpern 2 hergestellt werden muss, die bei beiden Zylinderbänken verwendbar ist.If the internal combustion engine 5 has two cylinder banks, each of which is provided with its own cylinder head cover 4, each of these cylinder head covers 4 can be equipped with such an oil pre-separator 1. Particularly advantageous is an embodiment in which the shell body 2 of the two Ölvorabscheider 1 are designed as equal parts, so that only one type of shell bodies 2 must be made, which is usable in both cylinder banks.

Claims (7)

  1. Cylinder head (6) of an internal combustion engine (5) having an oil pre-separator for crankcase gas, in particular in a motor vehicle, having a shell body (2) which, in the assembled state, is arranged on an inner side (3) of a cylinder head cover (4) of the internal combustion engine (5), in the process covers a wall section (7) of the cylinder head cover (4), and delimits a pre-separating space (8) with the covered wall section (7), the shell body (2) having at least one inlet section (9) which has a flow cross section which increases from an inlet opening (11) for crankcase gas towards the pre-separating space (8), the at least one inlet section (9) at the same time forming a return line for separated oil in such a way that the separated oil can drip through the respective inlet opening (11) into a cylinder head space (10) which is covered by the cylinder head cover (4), the respective inlet section (9) being configured in such a way that, in the assembled state, the respective inlet opening (11) is situated in the cylinder head space (10) in a middle longitudinal region (14) which is situated between two outer longitudinal regions (15) which are assigned to in each case one camshaft (16), an intermediate deck (21) being provided in the cylinder head (6), which intermediate deck (21) separates a camshaft space (20) which contains the camshafts (16) from a valve spring space (22) in the cylinder head space (10), springs from gas exchange valves being arranged in the valve spring space (22), and the respective inlet opening (11) being situated below the camshafts (16) and below the intermediate deck (21) in the valve spring space (22), characterized in that the shell body (2) has fastening elements (12), namely clip elements (12), by way of which it can be fastened to the cylinder head cover (4), namely by being clipped in, and in that the shell body (2) is adhesively bonded to the cylinder head cover (4).
  2. Cylinder head (6) according to Claim 1, characterized in that the respective inlet section (11) is configured in such a way that, in the assembled state, it protrudes into the cylinder head space (10) so as to project with its inlet opening (11) beyond a flange (17) of the cylinder head cover (4).
  3. Cylinder head (6) according to either of Claims 1 and 2, characterized in that the respective inlet section (9) is configured in such a way that, in the assembled state, the respective inlet opening (11) is situated in a region of the cylinder head space (10), which region is further away from the cylinder head cover (4) than the camshafts (16).
  4. Cylinder head (6) according to one of Claims 1 to 3, characterized in that the pre-separating space (8) has at least one outlet opening (19) for crankcase gas, which outlet opening (19) is configured in the cylinder head cover (4), and/or in that the shell body (2) does not have an outlet opening for crankcase gas.
  5. Cylinder head (6) according to one of Claims 1 to 4, characterized in that the shell body (2) is produced as an injection moulded part and/or a high pressure die cast part from plastic or from metal or light metal.
  6. Cylinder head (6) according to one of Claims 1 to 5, characterized in that, in the case of an internal combustion engine (5) having two cylinder banks, in each case one shell body (2) is arranged in each cylinder head cover (4) of the two cylinder banks, the two shell bodies (2) being configured as identical parts.
  7. Cylinder head (6) according to one of Claims 1 to 6, characterized in that the oil pre-separator (1) forms the only separating device which is arranged on the inside of the cylinder head cover (4) of an oil separating apparatus which has a plurality of separating devices.
EP08001485.5A 2007-02-23 2008-01-26 Oil pre-filter for crankcase gas Active EP1961928B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007010308A DE102007010308A1 (en) 2007-02-23 2007-02-23 Oil pre-filter for crankcase gas of internal-combustion engine, has shell body arranged in inner side of cylinder head cover, where shell body has inlet section which has flow cross-section increasing by inlet opening for crankcase gas
DE200720003094 DE202007003094U1 (en) 2007-02-23 2007-02-23 Oil separator for crankshaft gas of internal-combustion engine e.g. in motor vehicle, has jacket body arranged in mounting condition at inner side of cylinder head cover of internal-combustion engine

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EP1961928A2 EP1961928A2 (en) 2008-08-27
EP1961928A3 EP1961928A3 (en) 2010-11-10
EP1961928B1 true EP1961928B1 (en) 2018-07-25

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Publication number Priority date Publication date Assignee Title
CN114251156A (en) * 2020-09-21 2022-03-29 深圳臻宇新能源动力科技有限公司 Oil-gas separator

Citations (2)

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Publication number Priority date Publication date Assignee Title
JPH056116U (en) * 1991-07-01 1993-01-29 マツダ株式会社 Engine cylinder head structure
EP1428992A1 (en) * 2001-09-18 2004-06-16 Yanmar Co., Ltd. Breather device of engine

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Publication number Priority date Publication date Assignee Title
JPH0645612Y2 (en) 1988-07-30 1994-11-24 マツダ株式会社 Blow-by gas reduction device for DOHC engine
JP2879952B2 (en) * 1990-07-13 1999-04-05 ヤマハ発動機株式会社 Blow-by gas reduction device for DOHC engine
DE10127819A1 (en) 2001-06-07 2003-01-02 Bosch Gmbh Robert Oil separator for crankcase gases of an internal combustion engine
JP4344579B2 (en) 2003-10-15 2009-10-14 株式会社マーレ フィルターシステムズ Cylinder head cover oil separator
DE102004004753A1 (en) * 2004-01-30 2005-08-18 Mann + Hummel Gmbh Cylinder head cover

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Publication number Priority date Publication date Assignee Title
JPH056116U (en) * 1991-07-01 1993-01-29 マツダ株式会社 Engine cylinder head structure
EP1428992A1 (en) * 2001-09-18 2004-06-16 Yanmar Co., Ltd. Breather device of engine

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EP1961928A2 (en) 2008-08-27

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