EP0516879B1 - Internal combustion engine with an intake manifold for fresh air intake - Google Patents

Internal combustion engine with an intake manifold for fresh air intake Download PDF

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Publication number
EP0516879B1
EP0516879B1 EP91118825A EP91118825A EP0516879B1 EP 0516879 B1 EP0516879 B1 EP 0516879B1 EP 91118825 A EP91118825 A EP 91118825A EP 91118825 A EP91118825 A EP 91118825A EP 0516879 B1 EP0516879 B1 EP 0516879B1
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EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
intake pipe
cylinder head
connecting piece
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.)
Expired - Lifetime
Application number
EP91118825A
Other languages
German (de)
French (fr)
Other versions
EP0516879A1 (en
Inventor
Gerhard Dipl.-Ing. Haussmann
Achim Dipl.-Ing. Guggenmos
Heiko Dipl.-Ing. Gensert
Rolf Zeller
Helmut Dipl.-Ing. Seitz
Klaus Dipl.-Ing. Kofahl
Joachim Dipl.-Ing. Minich
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
Mercedes Benz AG
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Publication of EP0516879A1 publication Critical patent/EP0516879A1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10288—Air intakes combined with another engine part, e.g. cylinder head cover or being cast in one piece with the exhaust manifold, cylinder head or engine block
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/104—Intake manifolds
    • 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
    • F01M2013/0488—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with oil trap in the return conduit to the crankcase

Definitions

  • the invention relates to an internal combustion engine with an intake line for fresh air intake according to the features specified in the preamble of claim 1.
  • An internal combustion engine of the generic type is known from DE-PS 32 17 633. Furthermore, from DE-GM 89 00 612 an engine room ventilation in an internal combustion engine connected to an exhaust gas turbocharger is known. The ventilation described there takes place via channels arranged inside the motor housing and via a line guided on the outside of the motor.
  • the invention has for its object to provide a simple and reliable engine room ventilation in a generic internal combustion engine.
  • the intake line section has at least one connecting piece which projects through an opening provided in the cylinder head cover into the camshaft space.
  • annular sealing element is pressed into each opening of the cylinder head cover to seal the camshaft space against the engine exterior, which sealing element rests on the outside of the connecting piece by means of a sealing lip.
  • the connecting piece is pushed in a simple manner through the sealing element provided in the opening, which sealingly rests on the connecting piece, so that additional connecting elements, such as, for example, hose bands, are not required for sealing.
  • the cylinder head cover has at least one raised section which includes a ventilation space separated from the camshaft space by a separating plate, the connecting piece being connected to the ventilation space.
  • a separating plate in the cylinder head cover as a mudguard largely prevents the oil thrown up by a camshaft from reaching the connecting piece, creating a ventilation space separated from the camshaft space by the separating plate, through which ventilation gases flow almost exclusively.
  • oil that has penetrated with the ventilation gases can be deposited on the walls of the ventilation space.
  • the cross section of the connection piece is also expanded so that the flow rate of the ventilation gases is very low, which means that only a little oil is carried by the gases into the intake line.
  • a lower wall section of the suction line is doubled to form a ventilation channel. This is connected to the suction line at the downstream end of the section via a gap.
  • the ventilation gases are thereby shielded from the suction effect of the very low static pressure during full load operation, which is created by the fresh air flowing through the intake line at high speed.
  • the ventilation duct thus represents a largely calmed zone in which the oil carried in the ventilation gases can separate and then flow back into the crankcase via the connecting piece. In the further course of the flow, the ventilation gases pass into the suction line via the gap at the end of the wall section.
  • the lower wall section of the intake line is offset in the area of the connecting piece to the center of the intake line. Furthermore, the connecting pieces are accommodated in a cover, which is arranged in the course of the suction line and covers the lower wall section, the wall section and cover delimiting the ventilation duct.
  • the wall section offset towards the center of the intake line reduces the cross-sectional area of the intake line on a section of the route, so that pulsations which can occur in the intake line due to the gas exchange at full load operation are dampened. As a result, the suction effect of the vacuum regions locally formed in the event of pulsations on the oil-containing ventilation gases from the crankcase ventilation is prevented.
  • the gap at the downstream section end is arranged at a distance from the cover.
  • the advantageous embodiments of the invention largely prevent oil from the crankcase ventilation from entering the intake line, the oil consumption being reduced.
  • the formation of blue smoke and HC emissions are reduced in engine combustion, and the service life of a catalytic converter provided in an exhaust system can also be extended due to the lower load.
  • a section 1 of an intake line, not shown, of an internal combustion engine is guided over its cylinder head cover 2 and transversely to the longitudinal axis of the engine.
  • the suction line is connected, for example, to an air filter.
  • two connecting pieces 3 leading to the cylinder head cover 2 are formed at a distance.
  • the cylinder head cover 2 has two raised hood sections 4, which are opposite each other with respect to the longitudinal axis of the engine, and covers a camshaft space 5 to the engine outer space 6.
  • the raised hood sections 4 have openings 8 in a ceiling 7 of the cylinder head cover 2, through which the connecting pieces 3 each protrude.
  • annular sealing elements 9 in the form of bellows for sealing the engine outer space 6 against the camshaft space 5 are pressed, which rest with sealing lips 10 formed on the inner edges in a radially sealing manner against the connecting piece 3 and with a flange 11 formed on the outer edges, the opening edges 12 axially grasp sealingly. Due to the elastic configuration of the sealing elements 9, large tolerances can be compensated for during assembly and vibrations can be compensated for during driving. From the camshaft space 5 are separated by two inside the cylinder head cover 2 and the raised hood sections 4 covering separating plates 13 covering two ventilation spaces 14, in which essentially the ventilation gases emerging from the engine compartment flow via the connecting piece 3 to the intake line.
  • the separating plates 13 are attached to the inside 16 of the cylinder head cover 2 with screws 15 and have open accesses (not shown) from the camshaft space 5 to the ventilation spaces 14 and a collecting trough 17 each, from which a siphon-type pipe socket 18 to Camshaft chamber 5 branches.
  • the ventilation spaces 14 are each divided into two chambers 20, 21 by a partition 19 running perpendicular to the separating plates 13, of which the chambers 20 have access to the camshaft space 5.
  • the partition 19 is held on an upper side 22 in a groove 23 arranged in the ceiling area of the cylinder head cover 2 and on an underside 24 of a further groove 26 arranged on an upper side 25 of the separating plate 13.
  • the partition 19 is flush with one of its long sides on the inside 16 of the cylinder head cover 2, while with its other long side it forms a gap with the inside 16.
  • the chamber 21 has in its upper area not shown exits to the connecting piece 3.
  • the ventilation gases pass from the engine compartment via the camshaft space 5 together with a small part of the oil, which is thrown against the separator plates 13 by rotating camshafts located in the camshaft space 5 and not shown in the figure, into the chambers 20 of the ventilation spaces 14 and via the column into the chambers 21.
  • the oil that has penetrated into the ventilation spaces 14 is largely separated by multiple deflection of the ventilation gases on walls 27 of the chambers 20, 21, runs off into the collecting trough 17 and flows back into the connecting piece 18 the camshaft space 5.
  • the partition wall 19 extends the path of the ventilation gases mixed with oil flowing through the ventilation spaces 14 to the intake line, the separation rate of the oil in the chambers 20, 21 being increased.
  • a cover 28 is fastened to the lower peripheral region of the intake line section 1, which extends along the intake line and receives the two connecting pieces 3 leading away to the cylinder head cover 2.
  • a lower wall section 29 of the intake line section 1 is offset toward the center of the intake line, forming an upstream bending edge 30, and is covered by the cover 28, with which it delimits a ventilation channel 31 for discharging the ventilation gases from the crankcase.
  • the ventilation duct 31 is connected to the suction duct via a gap 32 which runs downstream in the flow direction of the suction duct and adjoins the ventilation duct 31.
  • the gap 32 is arranged at the section end 33 at a distance from the cover 28, the gap 32 for the ventilation gases forming a narrow passage and the section end 33 forming an oil weir for the oil carried in the ventilation gases.

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

Description

Die Erfindung betrifft eine Brennkraftmaschine mit einer Ansaugleitung zur Frischluftansaugung gemäß den im Oberbegriff des Patentanspruches 1 angegebenen Merkmalen.The invention relates to an internal combustion engine with an intake line for fresh air intake according to the features specified in the preamble of claim 1.

Eine Brennkraftmaschine der gattungsgemäßen Bauart ist aus der DE-PS 32 17 633 bekannt. Des weiteren ist aus der DE-GM 89 00 612 eine Motorraumentlüftung bei einer mit einem Abgasturbolader verbundenen Brennkraftmaschine bekannt. Die dort beschriebene Entlüftung erfolgt über innerhalb des Motorgehäuses angeordnete Kanäle und über eine außen am Motor geführten Leitung.An internal combustion engine of the generic type is known from DE-PS 32 17 633. Furthermore, from DE-GM 89 00 612 an engine room ventilation in an internal combustion engine connected to an exhaust gas turbocharger is known. The ventilation described there takes place via channels arranged inside the motor housing and via a line guided on the outside of the motor.

Der Erfindung liegt die Aufgabe zugrunde bei einer gattungsgemäßen Brennkraftmaschine eine möglichst einfache und betriebssichere Motorraumentlüftung zu schaffen.The invention has for its object to provide a simple and reliable engine room ventilation in a generic internal combustion engine.

Die Aufgabe ist erfindungsgemäß durch im Patentanspruch 1 angegebenen kennzeichnenden Merkmalen gelöst.The object is achieved by the characterizing features specified in claim 1.

Der Ansaugleitungsabschnitt weist dabei zumindest einen Anschlußstutzen, der durch eine in der Zylinderkopfhaube vorgesehene Öffnung in den Nockenwellenraum ragt. Der Anschluß des Nockenwellenraumes an die Ansaugleitung erfolgt dadurch ohne besondere Leitung, so daß aufgrund der geringen Teilevielfalt und infolge der kurzen Wegführung zum einen eine einfache Motorraumentlüftung erreicht wird. Zum anderen ist dieThe intake line section has at least one connecting piece which projects through an opening provided in the cylinder head cover into the camshaft space. The connection of the camshaft chamber to the intake line is thus carried out without a special line, so that, on the one hand, simple engine room ventilation is achieved due to the small number of parts and the short route. On the other hand, it is

Betriebssicherheit der Entlüftung gewährleistet, da die heißen Entlüftungsgase auf dem kurzen Weg vom Motorraum zur Ansaugleitung nur wenig Abkühlung erfahren, so daß ein Einfrieren des Anschlusses vermieden wird. Da bei der Montage der Ansaugleitung die Motorraumentlüftung zwangsläufig angeschlossen wird, ist außerdem die Montage vereinfacht.Operational safety of the ventilation is guaranteed, since the hot ventilation gases experience only a little cooling on the short way from the engine compartment to the intake line, so that the connection is not frozen. Since the engine room ventilation is inevitably connected when the intake line is installed, the installation is also simplified.

In einer vorteilhaften Ausgestaltung der Erfindung ist nach Anspruch 3 in jede Öffnung der Zylinderkopfhaube zur Abdichtung des Nockenwellenraumes gegen den Motoraußenraum ein ringförmiges Dichtelement eingepreßt, welches mittels einer Dichtlippe außen am Anschlußstutzen anliegt. Bei der Montage wird der Anschlußstutzen in einfacher Weise durch das in der Öffnung vorgesehene Dichtelement geschoben, welches dabei dichtend am Anschlußstutzen anliegt, so daß zusätzliche Verbindungselemente wie beispielsweise Schlauchbänder zur Abdichtung nicht benötigt werden.In an advantageous embodiment of the invention, an annular sealing element is pressed into each opening of the cylinder head cover to seal the camshaft space against the engine exterior, which sealing element rests on the outside of the connecting piece by means of a sealing lip. During assembly, the connecting piece is pushed in a simple manner through the sealing element provided in the opening, which sealingly rests on the connecting piece, so that additional connecting elements, such as, for example, hose bands, are not required for sealing.

In einer weiteren vorteilhaften Ausgestaltung der Erfindung nach Anspruch 4 weist die Zylinderkopfhaube mindestens einen erhöhten Abschnitt auf, der einen vom Nockenwellenraum durch ein Abscheideblech getrennten Entlüftungsraum einschließt, wobei der Anschlußstutzen an den Entlüftungsraum angeschlossen ist. Mit der Einrichtung eines Abscheidebleches in der Zylinderkopfhaube als Schutzblech wird weitgehend verhindert, daß das von einer Nockenwelle hochgeschleuderte Öl zum Anschlußstutzen gelangt, wobei ein durch das Abscheideblech vom Nokkenwellenraum getrennter Entlüftungsraum geschaffen wird, durch welchen fast ausschließlich Entlüftungsgase strömen. Durch geeignete Bemessung des Entlüftungsraumes kann sich mit den Entlüftungsgasen eingedrungenes Öl an den Wänden des Entlüftungsraumes abscheiden. Im Rahmen der Ausgestaltung ist darüber hinaus der Querschnitt des Anschlußstutzens so erweitert, daß die Strömungsgeschwindigkeit der Entlüftungsgase sehr gering ist, wodurch nur wenig Öl von den Gasen in die Ansaugleitung mitgeschleppt wird.In a further advantageous embodiment of the invention according to claim 4, the cylinder head cover has at least one raised section which includes a ventilation space separated from the camshaft space by a separating plate, the connecting piece being connected to the ventilation space. The installation of a separating plate in the cylinder head cover as a mudguard largely prevents the oil thrown up by a camshaft from reaching the connecting piece, creating a ventilation space separated from the camshaft space by the separating plate, through which ventilation gases flow almost exclusively. By suitable dimensioning of the ventilation space, oil that has penetrated with the ventilation gases can be deposited on the walls of the ventilation space. As part of the design, the cross section of the connection piece is also expanded so that the flow rate of the ventilation gases is very low, which means that only a little oil is carried by the gases into the intake line.

In einer vorteilhaften Ausgestaltung der Erfindung nach Anspruch 5 ist ein unterer Wandungsabschnitt der Ansaugleitung zur Bildung eines Entlüftungskanals gedoppelt. Dieser ist am stromab gelegenen Abschnittsende über einen Spalt mit der Ansaugleitung verbunden. Die Entlüftungsgase werden dadurch vor der Saugwirkung des bei Vollastbetrieb sehr niedrigen statischen Druckes, der durch die mit großer Geschwindigkeit durch die Ansaugleitung strömende Frischluft entsteht, abgeschirmt. Der Entlüftungskanal stellt somit eine weitgehend beruhigte Zone dar, in der sich das in den Entlüftungsgasen mitgeführte Öl abscheiden und dann über die Anschlußstutzen ins Kurbelgehäuse zurückfließen kann. Im weiteren Strömungsverlauf gelangen die Entlüftungsgase über den Spalt am Abschnittsende des Wandungsabschnitts in die Ansaugleitung.In an advantageous embodiment of the invention according to claim 5, a lower wall section of the suction line is doubled to form a ventilation channel. This is connected to the suction line at the downstream end of the section via a gap. The ventilation gases are thereby shielded from the suction effect of the very low static pressure during full load operation, which is created by the fresh air flowing through the intake line at high speed. The ventilation duct thus represents a largely calmed zone in which the oil carried in the ventilation gases can separate and then flow back into the crankcase via the connecting piece. In the further course of the flow, the ventilation gases pass into the suction line via the gap at the end of the wall section.

In einer vorteilhaften Ausgestaltung der Erfindung nach Anspruch 6 ist der untere Wandungsabschnitt der Ansaugleitung im Bereich der Anschlußstutzen zur Ansaugleitungsmitte versetzt. Des weiteren sind die Anschlußstutzen in einem Deckel aufgenommen, welcher im Verlauf der Ansaugleitung angeordnet ist und den unteren Wandungsabschnitt abdeckt, wobei Wandungsabschnitt und Deckel den Entlüftungskanal begrenzen. Der zur Ansaugleitungsmitte hin versetzte Wandungsabschnitt verkleinert die Querschnittsfläche der Ansaugleitung auf einem Streckenabschnitt, so daß Pulsationen, die durch den Gaswechsel bei Vollastbetrieb in der Ansaugleitung enstehen können, abgedämpft werden. Dadurch wird die Ansaugwirkung der bei Pulsationen lokal ausgebildeten Unterdruckbereiche auf die ölbehafteten Entlüftungsgase aus der Kurbelgehäuseentlüftung unterbunden.In an advantageous embodiment of the invention according to claim 6, the lower wall section of the intake line is offset in the area of the connecting piece to the center of the intake line. Furthermore, the connecting pieces are accommodated in a cover, which is arranged in the course of the suction line and covers the lower wall section, the wall section and cover delimiting the ventilation duct. The wall section offset towards the center of the intake line reduces the cross-sectional area of the intake line on a section of the route, so that pulsations which can occur in the intake line due to the gas exchange at full load operation are dampened. As a result, the suction effect of the vacuum regions locally formed in the event of pulsations on the oil-containing ventilation gases from the crankcase ventilation is prevented.

In einer weiteren vorteilhaften Ausgestaltung nach Anspruch 7 ist der Spalt am stromab gelegenen Abschnittsende in einem Abstand zum Deckel angeordnet. Dadurch bildet das Abschnittsende ein Ölwehr, an dem sich das restliche mitgeführte Öl aus den Entlüftungsgasen weitgehend abscheidet und sammelt und das abgeschiedene Öl vor einem Ausfließen in die Ansaugleitung zurückhält.In a further advantageous embodiment according to claim 7, the gap at the downstream section end is arranged at a distance from the cover. As a result, the end of the section forms an oil weir, on which the remaining entrained oil from the vent gases largely separates and collects and retains the separated oil from flowing out into the intake line.

Insgesamt wird durch die vorteilhaften Ausgestaltungen der Erfindung gemäß der Ansprüche 5 bis 7 weitgehend verhindert, daß Öl aus der Kurbelgehäuseentlüftung in die Ansaugleitung gelangt, wobei der Ölverbrauch reduziert wird. Des weiteren wird bei der motorischen Verbrennung die Bildung von Blaurauch sowie HC-Emissionen verringert, wobei auch aufgrund der geringeren Belastung die Lebensdauer eines in einer Abgasanlage vorgesehenen Katalysators verlängert werden kann. Schließlich kann ein Beaufschlagen eines in der Ansaugleitung angeordneten Hitzdraht-Luftmassenmessers mit Öl verhindert werden, wobei die mit dem Beaufschlagen von Öl verbundene Fehlerkennung der angesaugten Luftmasse vermieden wird.Overall, the advantageous embodiments of the invention largely prevent oil from the crankcase ventilation from entering the intake line, the oil consumption being reduced. In addition, the formation of blue smoke and HC emissions are reduced in engine combustion, and the service life of a catalytic converter provided in an exhaust system can also be extended due to the lower load. Finally, it is possible to prevent oil from being applied to a hot-wire air mass meter arranged in the intake line, the error detection of the air mass sucked in associated with oil being avoided.

In der nachfolgenden Zeichnungsbeschreibung sind zwei Ausführungsbeispiele der Erfindung anhand eines Abschnitts einer Ansaugleitung einer Frischluftansaugung bei einer Brennkraftmaschine mit zwei Anschlußstutzen und mit einem unter einer Zylinderkopfhaube angeordneten Nockenwellenraum näher erläutert.In the following description of the drawings, two exemplary embodiments of the invention are explained in more detail with reference to a section of an intake line of a fresh air intake in an internal combustion engine with two connecting pieces and with a camshaft space arranged under a cylinder head cover.

Es zeigt:

  • Fig. 1 einen quer über eine Zylinderkopfhaube verlaufenden Abschnitt einer Ansaugleitung mit Anschlußstutzen an einem Entlüftungsraum im Schnitt,
  • Fig. 2 im Querschnitt die Gestaltung des Entlüftungsraumes aus Fig. 1,
  • Fig. 3 den Ansaugleitungsabschnitt aus Fig. 1 mit einem an der Ansaugleitung angeordneten und mit dem Entlüftungsraum über die Anschlußstutzen verbundenen Entlüftungskanal im Schnitt.
It shows:
  • 1 shows a section of an intake line with a connecting piece on a ventilation space running across a cylinder head cover, on average,
  • 2 shows in cross section the design of the ventilation space from FIG. 1,
  • Fig. 3 shows the intake line section of FIG. 1 with a ventilation channel arranged on the intake line and connected to the ventilation space via the connecting piece on average.

In Fig. 1 ist ein Abschnitt 1 einer nicht näher gezeigten Ansaugleitung einer Brennkraftmaschine über deren Zylinderkopfhaube 2 und quer zur Motorlängsachse geführt. Die Ansaugleitung ist im hier nicht weiter dargestellten Verlauf beispielsweise mit einem Luftfilter verbunden. Am Abschnitt 1 sind mit Abstand zwei zur Zylinderkopfhaube 2 abführende Anschlußstutzen 3 angeformt. Die Zylinderkopfhaube 2 besitzt zwei bezüglich der Motorlängsachse einander gegenüberliegende, erhöht ausgebildete Haubenabschnitte 4 und deckt einen Nockenwellenraum 5 zum Motoraußenraum 6 ab. Die erhöhten Haubenabschnitte 4 weisen in einer Decke 7 der Zylinderkopfhaube 2 Öffnungen 8 auf, durch die jeweils die Anschlußstutzen 3 ragen. In die Öffnungen 8 sind ringförmige Dichtelemente 9 in Form von Balgen zur Abdichtung des Motoraußenraumes 6 gegen den Nockenwellenraum 5 eingepreßt, welche mit an Innenrändern ausgeformten Dichtlippen 10 radial dichtend an den Anschlußstutzen 3 anliegen und mit einem an den Außenrändern ausgeformten Flansch 11 die Öffnungsränder 12 axial dichtend umgreifen. Durch die elastische Ausgestaltung der Dichtelemente 9 können bei der Montage große Toleranzen und im Fahrbetrieb Vibrationen ausgeglichen werden. Vom Nockenwellenraum 5 sind durch zwei innerhalb der Zylinderkopfhaube 2 angebrachte und die erhöhten Haubenabschnitte 4 nach oben abdeckende Abscheidebleche 13 zwei Entlüftungsräume 14 abgegrenzt, in denen im wesentlichen die aus dem Motorraum übertretenden Entlüftungsgase über die Anschlußstutzen 3 zur Ansaugleitung strömen.In Fig. 1, a section 1 of an intake line, not shown, of an internal combustion engine is guided over its cylinder head cover 2 and transversely to the longitudinal axis of the engine. In the course not shown here, the suction line is connected, for example, to an air filter. At section 1 two connecting pieces 3 leading to the cylinder head cover 2 are formed at a distance. The cylinder head cover 2 has two raised hood sections 4, which are opposite each other with respect to the longitudinal axis of the engine, and covers a camshaft space 5 to the engine outer space 6. The raised hood sections 4 have openings 8 in a ceiling 7 of the cylinder head cover 2, through which the connecting pieces 3 each protrude. In the openings 8, annular sealing elements 9 in the form of bellows for sealing the engine outer space 6 against the camshaft space 5 are pressed, which rest with sealing lips 10 formed on the inner edges in a radially sealing manner against the connecting piece 3 and with a flange 11 formed on the outer edges, the opening edges 12 axially grasp sealingly. Due to the elastic configuration of the sealing elements 9, large tolerances can be compensated for during assembly and vibrations can be compensated for during driving. From the camshaft space 5 are separated by two inside the cylinder head cover 2 and the raised hood sections 4 covering separating plates 13 covering two ventilation spaces 14, in which essentially the ventilation gases emerging from the engine compartment flow via the connecting piece 3 to the intake line.

Wie in Fig. 2 aufgezeigt, sind die Abscheidebleche 13 mit Schrauben 15 an einer Innenseite 16 der Zylinderkopfhaube 2 angebracht und weisen hier nicht dargestellte offene Zugänge vom Nockenwellenraum 5 zu den Entlüftungsräumen 14 und je eine Auffangwanne 17 auf, von der ein siphonartiger Leitungsstutzen 18 zum Nockenwellenraum 5 abzweigt. Die Entlüftungsräume 14 sind von je einer senkrecht zu den Abscheideblechen 13 verlaufenden Trennwand 19 in zwei Kammern 20,21 unterteilt, von denen die Kammern 20 die Zugänge zum Nockenwellenraum 5 aufweisen. Die Trennwand 19 ist an einer Oberseite 22 in einer im Deckenbereich der Zylinderkopfhaube 2 angeordneten Nut 23 und an einer Unterseite 24 einer weiteren auf einer Oberseite 25 des Abscheidebleches 13 angeordneten Nut 26 gehalten. Die Trennwand 19 schließt mit einer ihrer Längsseiten an der Innenseite 16 der Zylinderkopfhaube 2 bündig ab, während sie mit ihrer anderen Längsseite mit der Innenseite 16 einen Spalt ausbildet. Die Kammer 21 weist in ihrem oberen Bereich nicht dargestellte Ausgänge zu den Anschlußstutzen 3 auf.As shown in Fig. 2, the separating plates 13 are attached to the inside 16 of the cylinder head cover 2 with screws 15 and have open accesses (not shown) from the camshaft space 5 to the ventilation spaces 14 and a collecting trough 17 each, from which a siphon-type pipe socket 18 to Camshaft chamber 5 branches. The ventilation spaces 14 are each divided into two chambers 20, 21 by a partition 19 running perpendicular to the separating plates 13, of which the chambers 20 have access to the camshaft space 5. The partition 19 is held on an upper side 22 in a groove 23 arranged in the ceiling area of the cylinder head cover 2 and on an underside 24 of a further groove 26 arranged on an upper side 25 of the separating plate 13. The partition 19 is flush with one of its long sides on the inside 16 of the cylinder head cover 2, while with its other long side it forms a gap with the inside 16. The chamber 21 has in its upper area not shown exits to the connecting piece 3.

Durch die nicht dargestellten Zugänge gelangen die Entlüftungsgase aus dem Motorraum über den Nockenwellenraum 5 zusammen mit einem geringen Teil des Öls, welches von im Nockenwellenraum 5 befindlichen und in der Abbildung nicht aufgezeigten rotierenden Nockenwellen gegen die Abscheidebleche 13 geschleudert wird, in die Kammern 20 der Entlüftungsräume 14 und über die Spalte in die Kammern 21. Das in die Entlüftungsräume 14 eingedrungene Öl wird durch mehrfache Umlenkung der Entlüftungsgase an Wänden 27 der Kammern 20,21 zum überwiegenden Teil abgeschieden, läuft in die Auffangwanne 17 ab und fließt über den Leitungsstutzen 18 zurück in den Nockenwellenraum 5. Durch die Trennwand 19 wird der Weg der durch die Entlüftungsräume 14 zur Ansaugleitung strömenden mit Öl vermischten Entlüftungsgase verlängert, wobei die Abscheiderate des Öls in den Kammern 20,21 vergrößert wird.Through the accesses, not shown, the ventilation gases pass from the engine compartment via the camshaft space 5 together with a small part of the oil, which is thrown against the separator plates 13 by rotating camshafts located in the camshaft space 5 and not shown in the figure, into the chambers 20 of the ventilation spaces 14 and via the column into the chambers 21. The oil that has penetrated into the ventilation spaces 14 is largely separated by multiple deflection of the ventilation gases on walls 27 of the chambers 20, 21, runs off into the collecting trough 17 and flows back into the connecting piece 18 the camshaft space 5. The partition wall 19 extends the path of the ventilation gases mixed with oil flowing through the ventilation spaces 14 to the intake line, the separation rate of the oil in the chambers 20, 21 being increased.

Abweichend von Fig. 1 ist in Fig. 3 ist am unteren Umfangsbereich des Ansaugleitungsabschnitts 1 ein Deckel 28 befestigt, welcher längs der Ansaugleitung verläuft und die zwei zur Zylinderkopfhaube 2 abführenden Anschlußstutzen 3 aufnimmt. Im Bereich der Anschlußstutzen 3 ist ein unterer Wandungsabschnitt 29 des Ansaugleitungsabschnitts 1 unter Ausbildung einer anströmseitigen Biegekante 30 zur Ansaugleitungsmitte hin versetzt und wird vom Deckel 28 abgedeckt, wobei er mit diesem einen Entlüftungskanal 31 zur Abführung der Entlüftungsgase aus dem Kurbelgehäuse begrenzt. Der Entlüftungskanal 31 ist über einen in Strömungsrichtung der Ansaugleitung verlaufenden stromab sich an den Entlüftungskanal 31 anschließenden Spalt 32 mit der Ansaugleitung verbunden. Der Spalt 32 ist dabei am Abschnittsende 33 mit Abstand zum Deckel 28 angeordnet, wobei der Spalt 32 für die Entlüftungsgase einen engen Durchlaß und das Abschnittsende 33 ein Ölwehr für das in den Entlüftungsgasen mitgeführte Öl bildet.1, a cover 28 is fastened to the lower peripheral region of the intake line section 1, which extends along the intake line and receives the two connecting pieces 3 leading away to the cylinder head cover 2. In the area of the connecting piece 3, a lower wall section 29 of the intake line section 1 is offset toward the center of the intake line, forming an upstream bending edge 30, and is covered by the cover 28, with which it delimits a ventilation channel 31 for discharging the ventilation gases from the crankcase. The ventilation duct 31 is connected to the suction duct via a gap 32 which runs downstream in the flow direction of the suction duct and adjoins the ventilation duct 31. The gap 32 is arranged at the section end 33 at a distance from the cover 28, the gap 32 for the ventilation gases forming a narrow passage and the section end 33 forming an oil weir for the oil carried in the ventilation gases.

Claims (7)

  1. An internal combustion engine with an intake pipe for drawing in fresh air, with a cylinder head cover covering a cam shaft space at the top of the internal combustion engine, a portion of the intake pipe extending over the cylinder head cover, characterised in that the intake pipe portion (1) comprises at least one connecting piece (3) passing into the cam shaft space (5) through an aperture (8) provided in the cylinder head cover (2).
  2. An internal combustion engine according to claim 1, characterised in that the connecting piece (3) is integrally formed on the portion (1) of the intake pipe.
  3. An internal combustion engine according to claim 1 or 2, characterised in that there is pressed into the aperture (8) in the cylinder head cover (2) a sealing element (9) having a sealing lip (10) bearing on the outside of the connecting piece (3).
  4. An internal combustion engine according to one of claims 1 to 3,
    characterised in that the cylinder head cover (2) comprises at least one raised portion (4) which encloses a venting space (14) separated from the cam shaft space (5) by a separating plate (13) and in that the connecting piece (3) is connected to the venting space (14).
  5. An internal combustion engine according to one of claims 1 to 4,
    characterised in that a lower wall portion (29) of the intake pipe is doubled to form a venting passage (31), this latter being connected via a gap (32) to the intake pipe at the downstream end (33) of said portion.
  6. An internal combustion engine according to claim 5, characterised in that the lower wall portion (29) of the intake pipe is offset towards the centre of the intake pipe in the region of the connecting piece (3) and is masked by a cover (28) disposed in the run of the intake pipe and in which the connecting pieces (3) are provided, the venting passage (31) being bounded by the wall portion (29) and the cover (28).
  7. An internal combustion engine according to claim 6, characterised in that the gap (32) is disposed at a distance from the cover (28) and the downstream end (33) of the said wall portion.
EP91118825A 1991-06-06 1991-11-05 Internal combustion engine with an intake manifold for fresh air intake Expired - Lifetime EP0516879B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4118557 1991-06-06
DE4118557A DE4118557C2 (en) 1991-06-06 1991-06-06 Crankcase ventilation for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP0516879A1 EP0516879A1 (en) 1992-12-09
EP0516879B1 true EP0516879B1 (en) 1994-03-02

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EP91118825A Expired - Lifetime EP0516879B1 (en) 1991-06-06 1991-11-05 Internal combustion engine with an intake manifold for fresh air intake

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US (1) US5235938A (en)
EP (1) EP0516879B1 (en)
DE (2) DE4118557C2 (en)

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Also Published As

Publication number Publication date
DE4118557C2 (en) 1993-10-14
DE59101107D1 (en) 1994-04-07
EP0516879A1 (en) 1992-12-09
DE4118557A1 (en) 1992-12-10
US5235938A (en) 1993-08-17

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