EP0856644B1 - Device for crancase ventilation for an internal combustion engine - Google Patents

Device for crancase ventilation for an internal combustion engine Download PDF

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Publication number
EP0856644B1
EP0856644B1 EP98100966A EP98100966A EP0856644B1 EP 0856644 B1 EP0856644 B1 EP 0856644B1 EP 98100966 A EP98100966 A EP 98100966A EP 98100966 A EP98100966 A EP 98100966A EP 0856644 B1 EP0856644 B1 EP 0856644B1
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EP
European Patent Office
Prior art keywords
oil
cylinder head
oil separator
internal combustion
combustion engine
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
EP98100966A
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German (de)
French (fr)
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EP0856644A1 (en
Inventor
Roland Clauss
Georg Leipner
Willy Treyz
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Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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Publication date
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Publication of EP0856644A1 publication Critical patent/EP0856644A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • 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
    • 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
    • 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 a ventilation device for Vent gases from the crankcase of an internal combustion engine according to the preamble of claim 1.
  • DE 31 28 470 A1 describes a generic ventilation device known for a crankcase of an internal combustion engine.
  • An oil separator is arranged in the cylinder head cover, from which an oil drain pipe goes off, into one in the cylinder head immersed arranged oil collection space.
  • the ventilation gases pass from the crankcase of the Internal combustion engine via ventilation lines in the oil separator.
  • the separated oil runs through the oil drain pipe into the Oil collecting space, over the overflow of which the oil then enters the Oil pan of the internal combustion engine arrives.
  • DE 41 18 557 A1 describes a ventilation device Known in the two with respect to the cylinder head cover Oil separator with opposite longitudinal axis of the engine Sumps are integrated, each of which is a siphon-like Branch pipe branches to the camshaft space. In the Venting the vent gases get out of the crankcase via the camshaft chamber into the oil separator. The secluded Oil runs into the drip pans and flows through the pipe sockets into the camshaft space. From there it gets over one Oil return drained down. The de-oiled ventilation gases are then fed to the intake system of the internal combustion engine.
  • the invention has for its object a ventilation device to create their siphon with inexpensive manufacture and simplified installation, no additional installation space is required.
  • An essential advantage of the invention lies in the small space requirement the ventilation device according to the invention and thus achievable lower installation space height of the motor.
  • the the Oil level element of the siphon forming trough is by an anyway required countersunk hole of a cylinder head screw is formed, so that neither an additional trough is produced nor an additional one Installation space must be made available.
  • the cylinder head cover can be made as flat as possible.
  • the Countersunk hole forms a sufficiently large oil collection volume, that constantly replenished from the oil draining from the oil separator is achieved, whereby a good siphon effect is achieved.
  • the design of the siphon according to the invention is not complex Manufacturing processes, such as bending processes, necessary. Because when installing the cylinder head cover on the cylinder head the inlet pipe arranged in the cylinder head cover inevitably dips into the countersunk hole in the cylinder head, assembly of the venting device is also simplified.
  • the inlet pipe is expediently connected to the in the cylinder head cover integrated oil separator and is thus cast already taken into account when casting the cylinder head cover. On Subsequent mounting of the inlet pipe is therefore unnecessary. Alternatively, press the inlet pipe into the oil separator imaginable.
  • the cover part of the oil separator is advantageously diagonal to the engine longitudinal axis, in the direction of the inlet pipes Guide ribs on the oil separated in the oil separator leads directly to the inlet pipe of the siphon.
  • the oil separator preferably also has a diagonal in the lower part weirs running to the longitudinal axis of the engine, which prevent that separated oil is drawn towards the air outlet.
  • FIG. 1 shows a ventilation device 1 for a crankcase 2 of an internal combustion engine partially shown with rows of cylinders arranged in a V-shape, of which only here a row of cylinders is shown.
  • the venting device 1 can also be arranged in rows in internal combustion engines Cylinders are used.
  • On the crankcase 2 is about 3 cylinder head screws in countersunk holes 4 a cylinder head 5 attached by a cylinder head cover 6 is covered.
  • the ventilation device 1 has one with an intake system 7 of the internal combustion engine connected vent line 8, one arranged in the course of the ventilation line 8 and into the cylinder head cover 6 integrated oil separators 9 and a siphon 10 on.
  • the vent line 8 is in a not shown Way connected to the crankcase of the internal combustion engine.
  • vent gases from the crankcase 2 derived and fed to the oil separator 9.
  • the in the Oil particles entrained in ventilation gases separate in the oil separator 9 and are not over the siphon 10 here shown, arranged in the cylinder head 5 and in the crankcase 2 Oil return fed through which the oil is also in a Oil pan, not shown, at the lower end of the crankcase 2 is traceable.
  • the de-oiled vent gases are the intake system located after the oil separator 9 7 fed to the internal combustion engine and then the motor Combustion mixed. 1 and 2 is included the breather flow with solid arrows and the oil return shown with dashed arrows.
  • the siphon 10 contains an inlet pipe 11 and an oil level element 12, the oil level element 12 being arranged in the cylinder head 5 Includes trough 3, which can be drilled or cast. in the present embodiment, the trough is expedient through the countersunk hole 3 for the cylinder head screw 4 formed.
  • the inlet pipe 11 of the siphon 10 is on the oil separator 9 attached, preferably cast on the oil separator 9 or also pressed into the oil separator 9, and dips according to the invention into the countersunk hole 3 for the cylinder head screw 4, the counterbore 3 also being cast can be.
  • what is deposited in the oil separator 9 arrives Oil through the inlet pipe 11 of the siphon 10 into the counterbore 3 of the cylinder head screw 4.
  • the siphon 10 is the oil return upstream, via which the oil via the cylinder head 5 and the crankcase 2 into the oil pan at the lower end of the crankcase 2 is returned.
  • Fig. 2 several inlet pipes 11 over the length l of the oil separator 9 distributed.
  • the countersunk hole 3 enables sufficient Length of the siphon 10 in which the draining oil collects and a liquid barrier, pressure equalizing Oil column builds up that an unwanted flow of the ventilation gases prevented by the inlet pipe 11 in countercurrent to the oil. Since the countersunk hole 3 constantly from the oil separator 9 after flowing oil is filled, the excess occurs Oil over an upper edge of the counterbore 3 in the Oil return on.
  • Fig. 2 shows a part of the integrated in the cylinder head cover 6
  • Oil separator 9 the one of the intake system 7 of the Internal combustion engine side 13 of the cylinder head cover 6 runs in the direction of an engine longitudinal axis 14.
  • the oil separator 9 comprises an integral part of the cylinder head cover 6 Lower part 15 and a cover part covering the lower part 15 16.
  • the oil separator 9 is designed as a volume separator, which is reassuring over large cross sections and long distances of the oily vent gas and thus an oil separation enables.
  • the lower part 15 and the cover part 16 form one box-shaped housing in which baffles 15a are arranged are that the vent gas stream entering the oil separator 9 is deflected several times, the impact surfaces 15a an inclination to a drainage channel running in the lower part 15 15b.
  • the oil particles in the ventilation gases meet the baffles 15a, strike there down and flow into the feed pipes via the drainage channel 15b 11 of the siphon 10.
  • the inner walls of the oil separator 9 are as possible rough to ensure good adhesion of the oil droplets to be separated to reach.
  • the cover part 16 has a first air outlet arranged at the rear 17 mainly for full load ventilation and a second, laterally arranged air outlet 18 mainly for Partial load ventilation, both in the intake system 7 of the Internal combustion engine open.
  • the ventilation device 1 can but only for venting at full load, at partial load or with mixed operation of the internal combustion engine as well as with a combination thereof, as in the present case, for Come into play.
  • the lid part 16 is on an inside Provide guide ribs 19 running diagonally to the longitudinal axis 14 of the engine, which lead the separated oil to the feed pipes 11 (see Fig. 1).
  • In the lower part 15 of the oil separator 9 are also weirs 20 running diagonally to the motor longitudinal axis 14, which prevent separated oil from moving towards the Air outlets 17, 18 is drawn.
  • both air outlets 17, 18 in the cover part 16 of the oil separator 9 geodetically higher in the installed position of the internal combustion engine are in the lower part 15 as the oil inlet into the inlet pipes 11 the oil separator 9 results in cooperation with the im Lower part 15 of the cylinder head cover 6 arranged weirs 20 for Retaining the oil that the oil separated in the oil separator 9 not via the air outlets 17, 18 in the intake system 7 of the Internal combustion engine is pulled, but in the inlet pipes 11 reached.
  • an area 21 of the air inlet into the oil separator 9 forms the cylinder head cover 6 bulkhead webs 22, an undesirable entry of spray oil from the chain space prevent in the oil separator 9.
  • the direction of the bulkheads 22 depends on the direction of rotation of the timing chain. What is striking Spray oil must be thrown away from the oil separator 9.

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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)

Description

Die Erfindung bezieht sich auf eine Entlüftungsvorrichtung für Entlüftungsgase aus dem Kurbelgehäuse einer Brennkraftmaschine gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a ventilation device for Vent gases from the crankcase of an internal combustion engine according to the preamble of claim 1.

Aus der DE 31 28 470 A1 ist eine gattungsgemäße Entlüftungsvorrichtung für ein Kurbelgehäuse einer Brennkraftmaschine bekannt. In der Zylinderkopfhaube ist ein Ölabscheider angeordnet, von dem ein Ölablaufrohr abgeht, das in einen im Zylinderkopf angeordneten Ölsammelraum eintaucht. Im Betrieb der Brennkraftmaschine gelangen die Entlüftungsgase vom Kurbelraum der Brennkraftmaschine über Entlüftungsleitungen in den Ölabscheider. Das abgeschiedene Öl läuft über das Ölablaufrohr in den Ölsammelraum, über dessen Überlauf das Öl anschließlich in die Ölwanne der Brennkraftmaschine gelangt.DE 31 28 470 A1 describes a generic ventilation device known for a crankcase of an internal combustion engine. An oil separator is arranged in the cylinder head cover, from which an oil drain pipe goes off, into one in the cylinder head immersed arranged oil collection space. In operation of the internal combustion engine the ventilation gases pass from the crankcase of the Internal combustion engine via ventilation lines in the oil separator. The separated oil runs through the oil drain pipe into the Oil collecting space, over the overflow of which the oil then enters the Oil pan of the internal combustion engine arrives.

Ferner ist aus der DE 41 18 557 A1 eine Entlüftungsvorrichtung bekannt, bei der in die Zylinderkopfhaube zwei bezüglich einer Motorlängsachse einander gegenüberliegende Ölabscheider mit Auffangwannen integriert sind, von denen jeweils ein siphonartiger Leitungsstutzen zum Nockenwellenraum abzweigt. Bei der Entlüftung gelangen die Entlüftungsgase aus dem Kurbelgehäuse über den Nockenwellenraum in die Ölabscheider. Das abgeschiedene Öl läuft in die Auffangwannen und fließt über die Leitungsstutzen in den Nockenwellenraum ab. Von dort wird es über einen Ölrücklauf nach unten abgeführt. Die entölten Entlüftungsgase werden anschließend dem Ansaugsystem der Brennkraftmaschine zugeführt. Furthermore, DE 41 18 557 A1 describes a ventilation device Known in the two with respect to the cylinder head cover Oil separator with opposite longitudinal axis of the engine Sumps are integrated, each of which is a siphon-like Branch pipe branches to the camshaft space. In the Venting the vent gases get out of the crankcase via the camshaft chamber into the oil separator. The secluded Oil runs into the drip pans and flows through the pipe sockets into the camshaft space. From there it gets over one Oil return drained down. The de-oiled ventilation gases are then fed to the intake system of the internal combustion engine.

Zum allgemeinen technischen Hintergrund wird noch auf die DE 23 41 267 A1, die EP 0 471 886 A1, die EP 0 732 484 A1 und die DE 37 13 210 C2 verwiesen.For the general technical background, reference is made to DE 23 41 267 A1, EP 0 471 886 A1, EP 0 732 484 A1 and DE 37 13 210 C2.

Der Erfindung liegt die Aufgabe zugrunde, eine Entlüftungsvorrichtung zu schaffen, deren Siphon bei kostengünstiger Herstellung und vereinfachter Montage keinen weiteren Einbauraum benötigt.The invention has for its object a ventilation device to create their siphon with inexpensive manufacture and simplified installation, no additional installation space is required.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruchs 1 gegebenen Merkmale gelöst.This object is achieved by the in the characteristic of Features given claim 1 solved.

Ein wesentlicher Vorteil der Erfindung liegt im geringen Platzbedarf der erfindungsgemäßen Entlüftungsvorrichtung und der damit erreichbaren geringeren Bauraumhöhe des Motors. Die das Ölstandselement des Siphons bildende Mulde ist durch eine ohnehin benötigte Senklochbohrung einer Zylinderkopfschraube gebildet, so daß weder eine zusätzliche Mulde hergestellt noch zusätzlicher Bauraum zur Verfügung gestellt werden muß. Die Zylinderkopfhaube kann möglichst flach ausgestaltet werden. Die Senklochbohrung bildet ein ausreichend großes Ölsammelvolumen, das vom ablaufenden Öl aus dem Ölabscheider ständig nachgefüllt wird, wodurch eine gute Siphonwirkung erreicht wird. Durch die erfindungsgemäße Ausgestaltung des Siphons sind keine aufwendigen Herstellungsverfahren, wie beispielsweise Biegevorgänge, notwendig. Da bei der Montage der Zylinderkopfhaube an den Zylinderkopf das in der Zylinderkopfhaube angeordnete Zulaufrohr zwangsläufig in die Senklochbohrung im Zylinderkopf eintaucht, ist außerdem die Montage der Entlüftungsvorrichtung vereinfacht. An essential advantage of the invention lies in the small space requirement the ventilation device according to the invention and thus achievable lower installation space height of the motor. The the Oil level element of the siphon forming trough is by an anyway required countersunk hole of a cylinder head screw is formed, so that neither an additional trough is produced nor an additional one Installation space must be made available. The cylinder head cover can be made as flat as possible. The Countersunk hole forms a sufficiently large oil collection volume, that constantly replenished from the oil draining from the oil separator is achieved, whereby a good siphon effect is achieved. Through the The design of the siphon according to the invention is not complex Manufacturing processes, such as bending processes, necessary. Because when installing the cylinder head cover on the cylinder head the inlet pipe arranged in the cylinder head cover inevitably dips into the countersunk hole in the cylinder head, assembly of the venting device is also simplified.

Zweckmäßigerweise ist das Zulaufrohr an den in der Zylinderkopfhaube integrierten Ölabscheider angegossen und wird somit bereits beim Gießen der Zylinderkopfhaube berücksichtigt. Ein nachträgliches Montieren des Zulaufrohres erübrigt sich daher. Alternativ ist auch ein Einpressen des Zulaufrohres in den Ölabscheider vorstellbar.The inlet pipe is expediently connected to the in the cylinder head cover integrated oil separator and is thus cast already taken into account when casting the cylinder head cover. On Subsequent mounting of the inlet pipe is therefore unnecessary. Alternatively, press the inlet pipe into the oil separator imaginable.

Das Deckelteil des Ölabscheiders weist vorteilhafterweise diagonal zur Motorlängsachse, in Richtung der Zulaufrohre verlaufende Leitrippen auf, die das im Ölabscheider abgeschiedene Öl direkt zu dem Zulaufrohr des Siphons führt.The cover part of the oil separator is advantageously diagonal to the engine longitudinal axis, in the direction of the inlet pipes Guide ribs on the oil separated in the oil separator leads directly to the inlet pipe of the siphon.

Bevorzugt weist der Ölabscheider im Unterteil ebenfalls diagonal zur Motorlängsachse verlaufende Wehre auf, die verhindern, daß abgeschiedenes Öl in Richtung Luftaustritt gezogen wird. The oil separator preferably also has a diagonal in the lower part weirs running to the longitudinal axis of the engine, which prevent that separated oil is drawn towards the air outlet.

Durch die Ausbildung von Abschottstegen in einem Bereich des Lufteintritts in den Ölabscheider wird ein Eintreten von Spritzöl aus dem Zylinderkopf in den Ölabscheider verhindert.Through the formation of bulkheads in one area of the Air entry into the oil separator will prevent spray oil from entering prevented from the cylinder head into the oil separator.

Weitere Ausgestaltungen und Vorteile der Erfindung gehen aus den übrigen Unteransprüchen und der Beschreibung hervor.Further configurations and advantages of the invention go out the other subclaims and the description.

Ein Ausführungsbeispiel ist im folgenden in zwei Zeichnungen mit weiteren Einzelheiten näher erläutert, und zwar zeigen:

Fig. 1
einen Ausschnitt einer Ansicht von hinten auf eine Brennkraftmaschine mit einer erfindungsgemäßen Entlüftungsvorrichtung in einem Teilschnitt, wobei die Entlüftungsvorrichtung eine mit dem Ansaugsystem der Brennkraftmaschine verbundene Entlüftungsleitung, einen in einer Zylinderkopfhaube integrierten Ölabscheider sowie einen aus einem Zulaufrohr und einer Senklochbohrung bestehenden Siphon aufweist, wobei der Ölabscheider ein Unterteil und ein Deckelteil mit Leitrippen zur Führung des abgeschiedenen Öles umfaßt und
Fig. 2
eine Draufsicht auf die Zylinderkopfhaube mit dem in die Zylinderkopfhaube integrierten Unterteil des Ölabscheiders, wobei im Unterteil Wehre zum Rückhalten des Öles angeordnet sind.
An exemplary embodiment is explained in more detail in the following in two drawings, showing:
Fig. 1
a partial rear view of an internal combustion engine with a ventilation device according to the invention in a partial section, the ventilation device having a ventilation line connected to the intake system of the internal combustion engine, an oil separator integrated in a cylinder head cover and an siphon consisting of an inlet pipe and a countersunk hole, the oil separator comprises a lower part and a cover part with guide ribs for guiding the separated oil and
Fig. 2
a plan view of the cylinder head cover with the integrated in the cylinder head cover lower part of the oil separator, weirs are arranged to retain the oil in the lower part.

Fig. 1 zeigt eine erfindungsgemäße Entlüftungsvorrichtung 1 für ein Kurbelgehäuse 2 einer teilweise dargestellten Brennkraftmaschine mit V-förmig angeordneten Zylinderreihen, wovon hier nur eine Zylinderreihe dargestellt ist. Die Entlüftungsvorrichtung 1 kann aber auch bei Brennkraftmaschinen mit reihenförmig angeordneten Zylindern eingesetzt werden. An dem Kurbelgehäuse 2 ist über in Senklochbohrungen 3 geführte Zylinderkopfschrauben 4 ein Zylinderkopf 5 befestigt, der von einer Zylinderkopfhaube 6 abgedeckt ist. 1 shows a ventilation device 1 for a crankcase 2 of an internal combustion engine partially shown with rows of cylinders arranged in a V-shape, of which only here a row of cylinders is shown. The venting device 1 can also be arranged in rows in internal combustion engines Cylinders are used. On the crankcase 2 is about 3 cylinder head screws in countersunk holes 4 a cylinder head 5 attached by a cylinder head cover 6 is covered.

Die Entlüftungsvorrichtung 1 weist eine mit einem Ansaugsystem 7 der Brennkraftmaschine verbundene Entlüftungsleitung 8, einen im Verlauf der Entlüftungsleitung 8 angeordneten und in die Zylinderkopfhaube 6 integrierten Ölabscheider 9 sowie einen Siphon 10 auf. Die Entlüftungsleitung 8 ist in einer nicht dargestellten Weise mit dem Kurbelraum der Brennkraftmaschine verbunden. Bei der Entlüftung werden die beim Betrieb der Brennkraftmaschine entstehenden Entlüftungsgase aus dem Kurbelgehäuse 2 abgeleitet und dem Ölabscheider 9 zugeführt. Die in den Entlüftungsgasen mitgeführten Ölpartikel scheiden sich im Ölabscheider 9 ab und werden über den Siphon 10 einem hier nicht dargestellten, im Zylinderkopf 5 sowie im Kurbelgehäuse 2 angeordneten Ölrücklauf zugeführt, durch den das Öl in eine ebenfalls nicht dargestellte Ölwanne am unteren Ende des Kurbelgehäuses 2 zurückführbar ist. Die entölten Entlüftungsgase werden dem im Anschluß an den Ölabscheider 9 befindlichen Ansaugsystem 7 der Brennkraftmaschine zugeleitet und anschließend der motorischen Verbrennung zugemischt. In den Fig. 1 und 2 ist dabei die Entlüftungsströmung mit durchgezogenen Pfeilen und die Ölrückführung mit strichlierten Pfeilen dargestellt.The ventilation device 1 has one with an intake system 7 of the internal combustion engine connected vent line 8, one arranged in the course of the ventilation line 8 and into the cylinder head cover 6 integrated oil separators 9 and a siphon 10 on. The vent line 8 is in a not shown Way connected to the crankcase of the internal combustion engine. When venting are those when operating the internal combustion engine vent gases from the crankcase 2 derived and fed to the oil separator 9. The in the Oil particles entrained in ventilation gases separate in the oil separator 9 and are not over the siphon 10 here shown, arranged in the cylinder head 5 and in the crankcase 2 Oil return fed through which the oil is also in a Oil pan, not shown, at the lower end of the crankcase 2 is traceable. The de-oiled vent gases are the intake system located after the oil separator 9 7 fed to the internal combustion engine and then the motor Combustion mixed. 1 and 2 is included the breather flow with solid arrows and the oil return shown with dashed arrows.

Der Siphon 10 enthält ein Zulaufrohr 11 und ein Ölstandselement 12, wobei das Ölstandselement 12 eine im Zylinderkopf 5 angeordnete Mulde 3 umfaßt, die gebohrt oder gegossen sein kann. Im vorliegenden Ausführungsbeispiel wird die Mulde zweckmäßigerweise durch die Senklochbohrung 3 für die Zylinderkopfschraube 4 gebildet. Das Zulaufrohr 11 des Siphons 10 ist am Ölabscheider 9 befestigt, vorzugsweise an den Ölabscheider 9 angegossen oder auch in den Ölabscheider 9 eingepreßt, und taucht erfindungsgemäß in die Senklochbohrung 3 für die Zylinderkopfschraube 4 ein, wobei die Senklochbohrung 3 auch bereits fertiggegossen sein kann. Somit gelangt das im Ölabscheider 9 abgeschiedene Öl über das Zulaufrohr 11 des Siphons 10 in die Senklochbohrung 3 der Zylinderkopfschraube 4. Der Siphon 10 ist dem Ölrücklauf vorgelagert, über den das Öl über den Zylinderkopf 5 und das Kurbelgehäuse 2 in die Ölwanne am unteren Ende des Kurbelgehäuses 2 zurückgeführt wird. Vorteilhafterweise sind gemäß Fig. 2 mehrere Zulaufrohre 11 über die Länge l des Ölabscheiders 9 verteilt. Die Senklochbohrung 3 ermöglicht eine ausreichende Länge des Siphons 10, in dem sich das ablaufende Öl sammelt und eine Flüssigkeitssperre bildende, druckausgleichende Ölsäule aufbaut, die ein ungewolltes Durchströmen der Entlüftungsgase durch das Zulaufrohr 11 im Gegenstrom zum Öl verhindert. Da die Senklochbohrung 3 ständig von dem aus dem Ölabscheider 9 nachfließenden Öl aufgefüllt wird, tritt das überschüssige Öl über eine Oberkante der Senklochbohrung 3 in den Ölrücklauf ein.The siphon 10 contains an inlet pipe 11 and an oil level element 12, the oil level element 12 being arranged in the cylinder head 5 Includes trough 3, which can be drilled or cast. in the present embodiment, the trough is expedient through the countersunk hole 3 for the cylinder head screw 4 formed. The inlet pipe 11 of the siphon 10 is on the oil separator 9 attached, preferably cast on the oil separator 9 or also pressed into the oil separator 9, and dips according to the invention into the countersunk hole 3 for the cylinder head screw 4, the counterbore 3 also being cast can be. Thus, what is deposited in the oil separator 9 arrives Oil through the inlet pipe 11 of the siphon 10 into the counterbore 3 of the cylinder head screw 4. The siphon 10 is the oil return upstream, via which the oil via the cylinder head 5 and the crankcase 2 into the oil pan at the lower end of the crankcase 2 is returned. According to Fig. 2 several inlet pipes 11 over the length l of the oil separator 9 distributed. The countersunk hole 3 enables sufficient Length of the siphon 10 in which the draining oil collects and a liquid barrier, pressure equalizing Oil column builds up that an unwanted flow of the ventilation gases prevented by the inlet pipe 11 in countercurrent to the oil. Since the countersunk hole 3 constantly from the oil separator 9 after flowing oil is filled, the excess occurs Oil over an upper edge of the counterbore 3 in the Oil return on.

Fig. 2 zeigt einen Teil des in der Zylinderkopfhaube 6 integrierten Ölabscheiders 9, der an einer dem Ansaugsystem 7 der Brennkraftmaschine zugewandten Seite 13 der Zylinderkopfhaube 6 in Richtung einer Motorlängsachse 14 verläuft. Der Ölabscheider 9 umfaßt ein einstückig mit der Zylinderkopfhaube 6 ausgebildetes Unterteil 15 sowie ein das Unterteil 15 abdeckendes Deckelteil 16. Der Ölabscheider 9 ist als Volumenabscheider ausgebildet, der über große Querschnitte und lange Wege eine Beruhigung des ölhaltigen Entlüftungsgases und damit eine Ölabscheidung ermöglicht. Das Unterteil 15 und das Deckelteil 16 bilden ein kastenförmiges Gehäuse, in welchem Prallflächen 15a so angeordnet sind, daß der in den Ölabscheider 9 eintretende Entlüftungsgasstrom mehrfach umgelenkt wird, wobei die Prallflächen 15a eine Neigung zu einer im Unterteil 15 verlaufenden Ablaufrinne 15b aufweisen. Die Ölpartikel der Entlüftungsgase treffen dabei auf die Prallflächen 15a auf, schlagen sich dort nieder und fließen über die Ablaufrinne 15b in die Zulaufrohre 11 des Siphons 10. Die Innenwände des Ölabscheiders 9 sind möglichst rauh, um eine gute Haftung der abzuscheidenden Öltröpfchen zu erreichen.Fig. 2 shows a part of the integrated in the cylinder head cover 6 Oil separator 9, the one of the intake system 7 of the Internal combustion engine side 13 of the cylinder head cover 6 runs in the direction of an engine longitudinal axis 14. The oil separator 9 comprises an integral part of the cylinder head cover 6 Lower part 15 and a cover part covering the lower part 15 16. The oil separator 9 is designed as a volume separator, which is reassuring over large cross sections and long distances of the oily vent gas and thus an oil separation enables. The lower part 15 and the cover part 16 form one box-shaped housing in which baffles 15a are arranged are that the vent gas stream entering the oil separator 9 is deflected several times, the impact surfaces 15a an inclination to a drainage channel running in the lower part 15 15b. The oil particles in the ventilation gases meet the baffles 15a, strike there down and flow into the feed pipes via the drainage channel 15b 11 of the siphon 10. The inner walls of the oil separator 9 are as possible rough to ensure good adhesion of the oil droplets to be separated to reach.

Das Deckelteil 16 weist einen ersten, hinten angeordneten Luftaustritt 17 hauptsächlich zur Vollastentlüftung und einen zweiten, seitlich angeordneten Luftaustritt 18 hauptsächlich zur Teillastentlüftung auf, die beide in das Ansaugsystem 7 der Brennkraftmaschine münden. Die Entlüftungsvorrichtung 1 kann aber sowohl nur zur Entlüftung bei Vollast, bei Teillast oder bei Mischbetrieb der Brennkraftmaschine als auch bei einer Kombination davon, wie beispielsweise im vorliegenden Fall, zum Einsatz kommen. An einer Innenseite ist das Deckelteil 16 mit diagonal zur Motorlängsachse 14 verlaufenden Leitrippen 19 versehen, die das abgeschiedene Öl zu den Zulaufrohren 11 führen (s. Fig. 1). Im Unterteil 15 des Ölabscheiders 9 sind ebenfalls diagonal zur Motorlängsachse 14 verlaufende Wehre 20 angeordnet, die verhindern, daß abgeschiedenes Öl in Richtung der Luftaustritte 17, 18 gezogen wird.The cover part 16 has a first air outlet arranged at the rear 17 mainly for full load ventilation and a second, laterally arranged air outlet 18 mainly for Partial load ventilation, both in the intake system 7 of the Internal combustion engine open. The ventilation device 1 can but only for venting at full load, at partial load or with mixed operation of the internal combustion engine as well as with a combination thereof, as in the present case, for Come into play. The lid part 16 is on an inside Provide guide ribs 19 running diagonally to the longitudinal axis 14 of the engine, which lead the separated oil to the feed pipes 11 (see Fig. 1). In the lower part 15 of the oil separator 9 are also weirs 20 running diagonally to the motor longitudinal axis 14, which prevent separated oil from moving towards the Air outlets 17, 18 is drawn.

Da beide Luftaustritte 17, 18 im Deckelteil 16 des Ölabscheiders 9 in Einbaulage der Brennkraftmaschine geodätisch höher liegen als der Öleintritt in die Zulaufrohre 11 im Unterteil 15 des Ölabscheiders 9 ergibt sich im Zusammenwirken mit den im Unterteil 15 der Zylinderkopfhaube 6 angeordneten Wehren 20 zum Rückhalten des Öles, daß das im Ölabscheider 9 abgeschiedene Öl nicht über die Luftaustritte 17, 18 in das Ansaugsystem 7 der Brennkraftmaschine gezogen wird, sondern in die Zulaufrohre 11 gelangt. In einem Bereich 21 des Lufteintritts in den Ölabscheider 9 bildet die Zylinderkopfhaube 6 Abschottstege 22 aus, die ein unerwünschtes Eintreten von Spritzöl aus dem Kettenraum in den Ölabscheider 9 verhindern. Die Richtung der Abschottstege 22 ist abhängig von der Drehrichtung der Steuerkette. Auftreffendes Spritzöl muß vom Ölabscheider 9 weggeschleudert werden.Since both air outlets 17, 18 in the cover part 16 of the oil separator 9 geodetically higher in the installed position of the internal combustion engine are in the lower part 15 as the oil inlet into the inlet pipes 11 the oil separator 9 results in cooperation with the im Lower part 15 of the cylinder head cover 6 arranged weirs 20 for Retaining the oil that the oil separated in the oil separator 9 not via the air outlets 17, 18 in the intake system 7 of the Internal combustion engine is pulled, but in the inlet pipes 11 reached. In an area 21 of the air inlet into the oil separator 9 forms the cylinder head cover 6 bulkhead webs 22, an undesirable entry of spray oil from the chain space prevent in the oil separator 9. The direction of the bulkheads 22 depends on the direction of rotation of the timing chain. What is striking Spray oil must be thrown away from the oil separator 9.

Claims (6)

  1. Venting device (1) for gases vented from out of the crankcase (2) of an internal combustion engine, to which a cylinder head (5) is secured by means of cylinder head screws (4) and which is covered by a cylinder head cover (6), the venting device (1) having a venting line (8) connected to the crank chamber and the intake system (7) of the internal combustion engine, an oil separator (9) disposed in the path of the venting line (8) and integrated in the cylinder head cover (6), as well as a siphon (10) for separated oil which contains an inflow pipe (11) and an oil level element (12), the inflow pipe (11) being secured to the oil separator (9) and the siphon (10) being mounted upstream of an oil return for the oil separated from the vented gases and consisting of at least one depression (3) provided in the cylinder head (5) and the inflow pipe (11) inserted in the depression (3),
    characterised in that
    the depression (3) of the siphon (10) is provided in the form of a countersunk bore of a cylinder head screw (4).
  2. Venting device as claimed in claim 1,
    characterised in that
    the oil separator (9) provided in the venting line (8) of the venting device (1) has several inflow pipes (11) distributed along its length (1).
  3. Venting device as claimed in claim 1 or 2,
    characterised in that
    the inflow pipe (11) to the oil separator (9) is cast onto or pressed into the oil separator (9).
  4. Venting device as claimed in one of claims 1 to 3,
    characterised in that
    the oil separator (9) comprises a bottom part (15) and a cover part (16), the bottom part (15) being made integrally with the cylinder head cover (6).
  5. Venting device as claimed in claim 4,
    characterised in that
    the oil separator (9) in the cover part (16) has guide ribs (19) to guide the separated oil.
  6. Venting device as claimed in claim 4,
    characterised in that
    the bottom part (15) of the oil separator (9) has barriers (20) to hold back the oil.
EP98100966A 1997-02-01 1998-01-21 Device for crancase ventilation for an internal combustion engine Expired - Lifetime EP0856644B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19703771A DE19703771C1 (en) 1997-02-01 1997-02-01 Ventilation device for a crankcase of an internal combustion engine
DE19703771 1997-02-01

Publications (2)

Publication Number Publication Date
EP0856644A1 EP0856644A1 (en) 1998-08-05
EP0856644B1 true EP0856644B1 (en) 2001-10-31

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US (1) US5975065A (en)
EP (1) EP0856644B1 (en)
DE (1) DE19703771C1 (en)

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DE10131004A1 (en) * 2001-06-27 2003-01-09 Mann & Hummel Filter Method for recycling crankcase gasses into the inlet manifold of an engine has an internal wall with ducts to evenly mix the gasses with fresh air
FR2874646B1 (en) 2004-08-27 2006-10-06 Coutier Moulage Gen Ind DESHUILEUR FOR INTERNAL COMBUSTION ENGINE
FR2882783B1 (en) * 2005-03-07 2007-05-11 Renault Sas OIL CIRCULATION DEVICE FOR INTERNAL COMBUSTION ENGINE
DE102006038831B4 (en) 2006-08-18 2018-03-15 Volkswagen Ag Internal combustion engine with recirculation of blow-by gases
FR2913055B1 (en) 2007-02-28 2011-03-25 Peugeot Citroen Automobiles Sa INTERNAL COMBUSTION ENGINE HAVING A VENTILATION DEVICE.
DE102008022818A1 (en) * 2008-05-08 2009-11-12 Hengst Gmbh & Co.Kg Oil separator with siphon
US9732707B1 (en) * 2013-12-09 2017-08-15 High Output Technology, LLC Vent for engine crankcases
DE102016015111B4 (en) * 2016-12-20 2021-10-14 Deutz Aktiengesellschaft Internal combustion engine
CH717661A1 (en) * 2020-07-15 2022-01-31 Liebherr Machines Bulle Sa Aerosol separator for separating aerosols in a blow-by gas.

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US5975065A (en) 1999-11-02
DE19703771C1 (en) 1998-06-25
EP0856644A1 (en) 1998-08-05

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