EP0933507A1 - Device for crankcase ventilation for an internal combusion engine - Google Patents

Device for crankcase ventilation for an internal combusion engine Download PDF

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Publication number
EP0933507A1
EP0933507A1 EP98123975A EP98123975A EP0933507A1 EP 0933507 A1 EP0933507 A1 EP 0933507A1 EP 98123975 A EP98123975 A EP 98123975A EP 98123975 A EP98123975 A EP 98123975A EP 0933507 A1 EP0933507 A1 EP 0933507A1
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EP
European Patent Office
Prior art keywords
inflow channel
oil
housing
venting device
channel
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Granted
Application number
EP98123975A
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German (de)
French (fr)
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EP0933507B1 (en
Inventor
Christian Hoefer
Thomas Kettner
Siegfried Weber
Roland Weik
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Daimler AG
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DaimlerChrysler AG
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Publication of EP0933507A1 publication Critical patent/EP0933507A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00Crankcase ventilating or breathing
    • F01M13/04Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00Crankcase ventilating or breathing
    • F01M13/04Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M2013/0422Separating oil and gas with a centrifuge device

Definitions

  • the invention relates to a ventilation device for a Crankcase of an internal combustion engine according to the preamble of claim 1.
  • the venting device includes one Centrifugal oil separator with a rotating housing that has a plurality of radially extending inflow channels, which in open a central, axially extending outflow channel.
  • the Oil-air mixture is drawn in radially from the outside inwards Inflow channels directed in which obstacles are arranged are due to the rotational movement of the housing centrifugal forces created the oil particles of the oil-air mixture separated from the obstacles and counter the inflow direction of the oil-air mixture radially outwards to be flung.
  • the air freed from the oil particles is discharged via the outflow channel and the intake tract Internal combustion engine supplied.
  • This venting device has the disadvantage that on the one hand the oil-air mixture is fed radially from the outside inwards, on the other hand, the separated oil particles in the opposite direction radially from the inside to the outside, so that inside two opposite currents arise in the inflow channel.
  • the invention is based on the problem of efficiency a venting device with a centrifugal oil separator to improve with simple means.
  • Another advantage is the axial entry of the oil-air mixture in the oil separator because the oil-air mixture before the inlet opening in the housing of the oil separator or only subjected to low centrifugal forces and the Entry of the flow into the housing is not hindered.
  • the outer wall of the inflow channel is expediently identical to a radial wall portion of the housing, the inflow opening of the inflow channel on an end face of the housing lies.
  • This version is characterized by a simple Design from where no specially trained External wall for the inflow channel is required.
  • outflow bores are advantageously introduced through which the separated oil can drain off.
  • the inflow channel is preferably designed to be annular the entry of the oil-air mixture into the housing via the to enable the entire scope of the housing. In this rotationally symmetrical Training can be the greatest possible throughput be achieved.
  • Is preferred between the inflow channel and the one with the outflow opening communicating interior arranged a partition which results in various advantages. It is one defined flow direction in the inflow channel approximately parallel given to the axis of rotation, an accidental crossing still unpurified oil-air mixture in the area of the discharge opening will be prevented. There is also the possibility Baffles, which are advantageously arranged in the inflow channel are not only on the outer wall, but also on to arrange the partition so that a multiple deflection of the inflowing oil-air mixture can be achieved.
  • the partition can be attached to the crankcase End cover rotatably mounted on the oil separator additionally supports and also the interior of the Crankcase is fluid-tight against the atmosphere.
  • baffles suitably arranged in the inflow channel can formed as webs projecting at an angle into the inflow channel be, in particular at least two consecutive Baffles are provided that alternate, for example be arranged on the outer wall and on the partition can, so that the inflowing mixture is redirected at least once and oil is deposited on the surfaces of the webs can.
  • the oil-air mixture feeds the inflow channel in the interior of the crankcase.
  • This feed channel preferably describes a deflection of about 180 °, so that already on the inner wall of the feed channel a pre-separation of oil particles from the supplied Oil-air mixture takes place.
  • the figure shows a ventilation device 1 for ventilation of the oil-air mixture in a crankcase 2 one Internal combustion engine.
  • the venting device 1 comprises one Centrifugal oil separator 3, which rotates with a balance shaft 14 is connected and a cover 12 in Has wall area of the crankcase 2.
  • the oil separator 3 rotates at the same speed as the balancer shaft 14, the Oil separator and the balance shaft have a common Axis of rotation 5.
  • the oil separator 3 has an approximately cylindrical, multi-part housing 4, which consists of a pot-like Base body 15, a first annular body 16 and a second annular body 17, the first body 16 on the end face of the housing wall of the base body 15 and the second in a corresponding manner Body 17 placed on the first body 16 is.
  • the base body 15 and the two body parts 16, 17 form a unit and are held together captively.
  • an approximately sleeve-shaped Partition 10 is provided, which is in one piece with the first body 16 is formed.
  • a Inflow channel 6 is formed, which is substantially parallel to Axis of rotation 5 and with a radial offset to the axis of rotation 5, the inflow opening of the inflow channel 6 in the region an axial end face facing the end cover 12 of the housing 4 is.
  • the inflow channel 6 is annular constructed, the inflow opening extends accordingly on the axial face over 360 ° over the entire Scope. If necessary, instead of an annular Inflow channel also several, segment-wise over the circumference Distributed inflow channels can be arranged.
  • the cover plate 12 fixed to the crankcase 2 has an annular receiving groove 18 in which the free End face of the partition 10 is added.
  • a sealing ring 19 is arranged to the interior of the Oil separator flow-tight against the crankcase interior to complete and prevent incorrect air flows.
  • the face the partition 10 is rotatably received in the receiving groove 18.
  • In the end cover 12 there is an axial outflow opening 7 provided, through which the housing interior with the intake tract the internal combustion engine is connected.
  • a feed channel 13 formed over which the oil-air mixture from the Crankcase interior is passed into the inflow channel 6.
  • the feed channel 13 directs the axially flowing oil-air mixture by 180 ° and directs the mixture into the housing 4.
  • the feed channel is not necessary when the inflow opening of the oil separator on the opposite end cover opposite side is arranged.
  • baffles 11 are arranged, which are in shape of angled webs into the free flow cross section of the inflow channel 6 protrude. They are in the direction of flow several baffles 11 arranged one behind the other are provided, which expediently alternate from opposite Insert sides into the inflow channel.
  • a chicane 11 which is integral with the second body 17 of the housing 4 is formed in the inflow channel 6.
  • Another chicane 11 is on the Partition 10 attached.
  • the oil-air mixture is according to the drawn flow arrows several times by 180 ° in the inflow channel 6 deflected around the baffles 11.
  • outflow bores 9 introduced for separated oil, which is expediently even are distributed over the circumference of the outer wall 8, wherein axially both in the base body 15 and in the first body 16 and optionally also in the second body 17 outflow bores 9 are provided.
  • drain holes can also have openings of any cross-section, for example Column.
  • the outflow bores arrange the circumference unevenly.
  • the oil separation works as follows: The oil-air mixture from the crankcase interior flows in the direction of the entered flow arrows into the feed channel 13 and further into the inflow channel 6, the mixture being passed through the baffles 11 and separated on the walls of the baffles or on the inside of the outer wall 8 becomes.
  • centrifugal forces act on the oil particles, so that the oil particles are pressed against the inside of the outer wall 8 and flow radially outward through the outflow bores 9 back into the crankcase interior.
  • the flow is not impaired by the rotational movement, so that the clean air freed from the oil particles can enter the interior of the housing and leave the oil separator 3 via the outflow opening 7.

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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)

Abstract

The device has a centrifugal oil separator (3) with ring-shaped intake channel (6), which extends radially offset and mainly axis-parallel to the rotary axis (5) of the separator. The outer wall (8) of the channel is also part of the separator housing wall (4) . The outer channel wall has oil outlet bores (9). A cover (12) for the housing is fastened to the crankcase (2), forming a feed channel (13), which communicates with the intake channel. The housing is non-turnably connected to the differential shaft (14).

Description

Die Erfindung betrifft eine Entlüftungsvorrichtung für ein Kurbelgehäuse einer Brennkraftmaschine nach dem Oberbegriff des Anspruches 1.The invention relates to a ventilation device for a Crankcase of an internal combustion engine according to the preamble of claim 1.

Aus der DE 196 07 919 A1 ist eine gattungsgemäße Entlüftungsvorrichtung bekannt, mittels der die Ölpartikel im Öl-Luft-Gemisch eines Kurbelgehäuses abgeschieden und in die Ölwanne zurückgeführt werden. Die Entlüftungsvorrichtung umfaßt einen Zentrifugal-Ölabscheider mit einem rotierenden Gehäuse, das mehrere radial verlaufende Einströmkanäle aufweist, die in einen zentralen, axial verlaufenden Abstromkanal münden. Das Öl-Luft-Gemisch wird radial von außen nach innen durch die Einströmkanäle geleitet, in denen Hindernisse angeordnet sind, wobei aufgrund der durch die Rotationsbewegung des Gehäuses efzeugten Zentrifugalkräfte die Ölpartikel des Öl-Luft-Gemisches an den Hindernissen abgeschieden und entgegen der Einströmrichrtung des Öl-Luft-Gemisches radial nach außen geschleudert werden. Die von den Ölpartikeln befreite Luft wird über den Abströmkanal abgeführt und dem Ansaugtrakt der Brennkraftmaschine zugeführt.DE 196 07 919 A1 describes a generic ventilation device known, by means of which the oil particles in the oil-air mixture deposited in a crankcase and into the oil pan to be led back. The venting device includes one Centrifugal oil separator with a rotating housing that has a plurality of radially extending inflow channels, which in open a central, axially extending outflow channel. The Oil-air mixture is drawn in radially from the outside inwards Inflow channels directed in which obstacles are arranged are due to the rotational movement of the housing centrifugal forces created the oil particles of the oil-air mixture separated from the obstacles and counter the inflow direction of the oil-air mixture radially outwards to be flung. The air freed from the oil particles is discharged via the outflow channel and the intake tract Internal combustion engine supplied.

Diese Entlüftungsvorrichtung hat den Nachteil, daß einerseits das Öl-Luft-Gemisch radial von außen nach innen zugeführt, andererseits die abgeschiedenen Ölpartikel in Gegenrichtung radial von innen nach außen abgeführt werden, so daß innerhalb des Einströmkanals zwei gegenläufige Ströme entstehen. This venting device has the disadvantage that on the one hand the oil-air mixture is fed radially from the outside inwards, on the other hand, the separated oil particles in the opposite direction radially from the inside to the outside, so that inside two opposite currents arise in the inflow channel.

Dies hat einen begrenzten Wirkungsgrad der Entlüftungsvorrichtung zur Folge, und zwar sowohl im Hinblick auf den Strömungsdurchsatz als auch hinsichtlich des Reinigungsgrades, weil die gegenläufigen Ströme sich gegenseitig behindern und zumindest teilweise eine permanente Durchmischung beider Ströme stattfindet. Auch eine Drehzahlerhöhung des Zentrifugal-Abscheiders führt zu keinem besseren Wirkungsgrad, weil mit zunehmender Drehgeschwindigkeit die nach außen gerichtete Ölpartikel-Strömung die nach innen gerichtete Öl-Luft-Strömung in steigendem Maße mitreißt.This has a limited efficiency of the ventilation device result, both in terms of flow rate as well as the degree of cleaning, because the opposite currents hinder each other and at least partially permanent mixing of both Flows takes place. Also an increase in the speed of the centrifugal separator does not lead to better efficiency because with increasing rotational speed the outward Oil particle flow the inward oil-air flow increasingly enthralling.

Weiterhin ist nachteilig, daß im Gehäuse-Innenraum ein bestimmter Mindest-Überdruck erzeugt werden muß, damit das Öl-Luft-Gemisch radial von außen nach innen strömt. Auch diese nach innen gerichtete Strömung beeinträchtigt den Reinigungsgrad, da auch abgeschiedene und nach außen geschleuderte Ölpartikel von der Öl-Luft-Strömung aufgenommen und in den Innenraum des Gehäuses transportiert werden können.Another disadvantage is that a certain inside the housing Minimum overpressure must be generated in order for the oil-air mixture flows radially from the outside to the inside. This too inward flow affects the degree of cleaning, since there are also separated and flung oil particles absorbed by the oil-air flow and into the interior of the housing can be transported.

Der Erfindung liegt das Problem zugrunde, den Wirkungsgrad einer Entlüftungsvorrichtung mit einem Zentrifugal-Ölabscheider mit einfachen Mitteln zu verbessern.The invention is based on the problem of efficiency a venting device with a centrifugal oil separator to improve with simple means.

Dieses Problem wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst.This problem is solved according to the invention with the features of the claim 1 solved.

Infolge des im wesentlichen achsparallelen Verlaufs des Einströmkanals zur Drehachse des Gehäuses des Ölabscheiders stehen die Richtungsvektoren des einströmenden Öl-Luft-Gemisches und der im Einströmkanal radial nach außen geschleuderten Ölpartikel etwa senkrecht zueinander, so daß beide Strömungen weitestgehend entkoppelt sind und eine gegenseitige Strömungsbeeinträchtigung vermieden wird. Da keine gegenläufigen Strömungen entstehen, reicht der im Ansaugtrakt der Brennkraftmaschine erzeugte Unterdruck aus, um eine Öl-Luft-Strömung in das Gehäuse des Ölabscheiders hinein auszubilden. Zugleich werden die Ölpartikel durch die aufgrund der Rotationsbewegung erzeugten Zentrifugalkräfte radial nach außen gedrückt und an der Innenseite der Außenwand des Einströmkanals abgeschieden. Sowohl der Reinigungsgrad als auch der Durchsatz des pro Zeiteinheit durch den Ölabscheider geschleusten Öl-Luft-Gemisches ist erhöht.As a result of the essentially axially parallel course of the inflow channel to the axis of rotation of the oil separator housing the direction vectors of the incoming oil-air mixture and the oil particles flung radially outwards in the inflow channel approximately perpendicular to each other so that both flows are largely decoupled and a mutual flow impairment is avoided. Since no opposite Currents arise that is sufficient in the intake tract of the internal combustion engine generated negative pressure from an oil-air flow into the housing of the oil separator. At the same time, the oil particles due to the rotational movement generated centrifugal forces pressed radially outwards and on the inside of the outer wall of the inflow channel deposited. Both the degree of cleaning and the throughput per unit of time passed through the oil separator Oil-air mixture is increased.

Ein weiterer Vorteil ist der axiale Eintritt des Öl-Luft-Gemisches in den Ölabscheider, weil das Öl-Luft-Gemisch vor der Eintrittsöffnung in das Gehäuse des Ölabscheiders keinen bzw. nur geringen Zentrifugalkräften unterworfen ist und der Eintritt der Strömung in das Gehäuse nicht behindert wird.Another advantage is the axial entry of the oil-air mixture in the oil separator because the oil-air mixture before the inlet opening in the housing of the oil separator or only subjected to low centrifugal forces and the Entry of the flow into the housing is not hindered.

Zweckmäßig ist die Außenwand des Einströmkanals identisch mit einem radialen Wandabschnitt des Gehäuses, wobei die Einströmöffnung des Einströmkanals an einer Stirnseite des Gehäuses liegt. Diese Ausführung zeichnet sich durch eine einfache Ausgestaltung aus, bei der keine gesondert ausgebildete Außenwand für den Einströmkanal benötigt wird. In die Außenwand sind vorteilhaft Abströmbohrungen eingebracht, durch die das abgeschiedene Öl abfließen kann.The outer wall of the inflow channel is expediently identical to a radial wall portion of the housing, the inflow opening of the inflow channel on an end face of the housing lies. This version is characterized by a simple Design from where no specially trained External wall for the inflow channel is required. In the outer wall outflow bores are advantageously introduced through which the separated oil can drain off.

Der Einströmkanal ist vorzugsweise ringförmig gestaltet, um den Eintritt des Öl-Luft-Gemisches in das Gehäuse über den gesamten Umfang des Gehäuses zu ermöglichen. In dieser rotationssymmetrischen Ausbildung kann ein größtmöglicher Durchsatz erzielt werden.The inflow channel is preferably designed to be annular the entry of the oil-air mixture into the housing via the to enable the entire scope of the housing. In this rotationally symmetrical Training can be the greatest possible throughput be achieved.

Bevorzugt ist zwischen dem Einströmkanal und dem mit der Abströmöffnung kommunizierendem Innenraum eine Trennwand angeordnet, woraus sich verschiedene Vorteile ergeben. Es ist eine definierte Strömungsrichtung im Einströmkanal etwa parallel zur Drehachse gegeben, ein versehentlicher Übertritt noch ungereinigten Öl-Luft-Gemisches in den Bereich der Abströmöffnung wird verhindert. Außerdem bietet sich die Möglichkeit, Schikanen, die vorteilhaft im Einströmkanal angeordnet sind, nicht nur an der Außenwand, sondern zusätzlich auch an der Trennwand anzuordnen, so daß eine mehrfache Umlenkung des einströmenden Öl-Luft-Gemisches erreicht werden kann. Schließlich kann die Trennwand an einem am Kurbelgehäuse befestigten Abschlußdeckel drehbar gelagert sein, der den Ölabscheider zusätzlich stützt und außerdem den Innenraum des Kurbelgehäuses strömungsdicht gegen die Atmosphäre abschließt.Is preferred between the inflow channel and the one with the outflow opening communicating interior arranged a partition, which results in various advantages. It is one defined flow direction in the inflow channel approximately parallel given to the axis of rotation, an accidental crossing still unpurified oil-air mixture in the area of the discharge opening will be prevented. There is also the possibility Baffles, which are advantageously arranged in the inflow channel are not only on the outer wall, but also on to arrange the partition so that a multiple deflection of the inflowing oil-air mixture can be achieved. Finally, the partition can be attached to the crankcase End cover rotatably mounted on the oil separator additionally supports and also the interior of the Crankcase is fluid-tight against the atmosphere.

Die zweckmäßig im Einströmkanal angeordneten Schikanen können als winklig in den Einströmkanal einragende Stege ausgebildet sein, wobei insbesondere mindestens zwei hintereinanderliegende Schikanen vorgesehen sind, die beispielsweise abwechselnd an der Außenwand und an der Trennwand angeordnet sein können, so daß das einströmende Gemisch mindestens einmal umgelenkt wird und sich an den Oberflächen der Stege Öl ablagern kann.The baffles suitably arranged in the inflow channel can formed as webs projecting at an angle into the inflow channel be, in particular at least two consecutive Baffles are provided that alternate, for example be arranged on the outer wall and on the partition can, so that the inflowing mixture is redirected at least once and oil is deposited on the surfaces of the webs can.

Zwischen dem Abschlußdeckel und dem Gehäuse des Ölabscheiders ist vorteilhaft ein Zuführkanal ausgebildet, der das Öl-Luft-Gemisch im Innenraum des Kurbelgehäuses dem Einströmkanal zuführt. Dieser Zuführkanal beschreibt vorzugsweise eine Umlenkung von etwa 180°, so daß bereits an der Innenwand des Zuführkanals eine Vorabscheidung von Ölpartikeln aus dem zugeführten Öl-Luft-Gemisch erfolgt.Between the end cover and the housing of the oil separator is advantageously a feed channel formed, the oil-air mixture feeds the inflow channel in the interior of the crankcase. This feed channel preferably describes a deflection of about 180 °, so that already on the inner wall of the feed channel a pre-separation of oil particles from the supplied Oil-air mixture takes place.

Weitere Vorteile und zweckmäßige Ausführungsformen sind den weiteren Ansprüchen, der Figurenbeschreibung und der Zeichnung zu entnehmen, in der ein Ausführungsbeispiel der Erfindung dargestellt ist. Further advantages and practical embodiments are the further claims, the description of the figures and the drawing can be seen in the an embodiment of the invention is shown.

Die Figur zeigt eine Entlüftungsvorrichtung 1 für die Entlüftung des Öl-Luft-Gemisches in einem Kurbelgehäuse 2 einer Brennkraftmaschine. Die Entlüftungsvorrichtung 1 umfaßt einen Zentrifugal-Ölabscheider 3, der drehfest mit einer Ausgleichswelle 14 verbunden ist und einen Abschlußdeckel 12 im Wandbereich des Kurbelgehäuses 2 aufweist. Der Ölabscheider 3 dreht mit gleicher Drehzahl wie die Ausgleichswelle 14, der Ölabscheider und die Ausgleichswelle haben eine gemeinsame Drehachse 5.The figure shows a ventilation device 1 for ventilation of the oil-air mixture in a crankcase 2 one Internal combustion engine. The venting device 1 comprises one Centrifugal oil separator 3, which rotates with a balance shaft 14 is connected and a cover 12 in Has wall area of the crankcase 2. The oil separator 3 rotates at the same speed as the balancer shaft 14, the Oil separator and the balance shaft have a common Axis of rotation 5.

Es kann auch zweckmäßig sein, den Ölabscheider mit der Kurbelwelle oder der Nockenwelle zu verbinden bzw. über eine Steuerkette anzutreiben.It may also be appropriate to use the oil separator with the crankshaft or to connect the camshaft or via a To drive timing chain.

Der Ölabscheider 3 weist ein näherungsweise zylindrisches, mehrteiliges Gehäuse 4 auf, das aus einem topfähnlichen Grundkörper 15, einem ersten ringförmigen Aufbaukörper 16 und einem zweiten ringförmigen Aufbaukörper 17 besteht, wobei der erste Aufbaukörper 16 auf die Stirnseite der Gehäusewandung des Grundkörpers 15 und in entsprechender Weise der zweite Aufbaukörper 17 auf den ersten Aufbaukörper 16 aufgesetzt ist. Der Grundkörper 15 und die beiden Aufbaukörper 16, 17 bilden eine Einheit und sind unverlierbar zusammengehalten.The oil separator 3 has an approximately cylindrical, multi-part housing 4, which consists of a pot-like Base body 15, a first annular body 16 and a second annular body 17, the first body 16 on the end face of the housing wall of the base body 15 and the second in a corresponding manner Body 17 placed on the first body 16 is. The base body 15 and the two body parts 16, 17 form a unit and are held together captively.

Im Gehäuse 4 des Ölabscheiders 3 ist eine etwa hülsenförmige Trennwand 10 vorgesehen, die einteilig mit dem ersten Aufbaukörper 16 ausgebildet ist. Radial zwischen der Trennwand 10 und der radial außenliegenden Wandung des Gehäuses 4 ist ein Einströmkanal 6 gebildet, der im wesentlichen parallel zur Drehachse 5 und mit radialem Versatz zur Drehachse 5 verläuft, wobei die Einströmöffnung des Einströmkanals 6 im Bereich einer axialen, dem Abschlußdeckel 12 zugewandten Stirnseite des Gehäuses 4 liegt. Der Einströmkanal 6 ist ringförmig aufgebaut, entsprechend erstreckt sich die Einströmöffnung an der axialen Stirnseite über 360° über den gesamten Umfang. Gegebenenfalls können anstelle eines ringförmigen Einströmkanals auch mehrere, über den Umfang segmentweise verteilte Einströmkanäle angeordnet sein.In the housing 4 of the oil separator 3 is an approximately sleeve-shaped Partition 10 is provided, which is in one piece with the first body 16 is formed. Radially between the partition 10 and the radially outer wall of the housing 4 is a Inflow channel 6 is formed, which is substantially parallel to Axis of rotation 5 and with a radial offset to the axis of rotation 5, the inflow opening of the inflow channel 6 in the region an axial end face facing the end cover 12 of the housing 4 is. The inflow channel 6 is annular constructed, the inflow opening extends accordingly on the axial face over 360 ° over the entire Scope. If necessary, instead of an annular Inflow channel also several, segment-wise over the circumference Distributed inflow channels can be arranged.

Zwischen der Außenwand 8 des Einströmkanals im Bereich des ersten Aufbaukörpers 16 und der radial innenliegenden Trennwand 10 ist ein Durchlaß gebildet, über den der Einströmkanal 6 mit dem Innenraum des Gehäuses 4 kommuniziert.Between the outer wall 8 of the inflow channel in the area of first body 16 and the radially inner partition 10 a passage is formed through which the inflow channel 6 communicates with the interior of the housing 4.

Der stationär am Kurbelgehäuse 2 befestigte Abschlußdeckel 12 weist eine ringförmige Aufnahmenut 18 auf, in der die freie Stirnseite der Trennwand 10 aufgenommen ist. In der Aufnahmenut 18 ist ein Dichtring 19 angeordnet, um den Innenraum des Ölabscheiders strömungsdicht gegen den Kurbelgehäuseinnenraum abzuschließen und Fehlluftströme zu verhindern. Die Stirnseite der Trennwand 10 ist drehbar in der Aufnahmenut 18 aufgenommen. Im Abschlußdeckel 12 ist eine axiale Abströmöffnung 7 vorgesehen, über die der Gehäuseinnenraum mit dem Ansaugtrakt der Brennkraftmaschine in Verbindung steht. Zwischen der dem Kurbelgehäuseinnenraum zugewandten Innenseite des Abschlußdeckels 12 und dem Gehäuse 4 des Ölabscheiders 3 ist ein Zuführkanal 13 gebildet, über den das Öl-Luft-Gemisch aus dem Kurbelgehäuseinnenraum in den Einströmkanal 6 geleitet wird. Der Zuführkanal 13 lenkt das axial anströmende Öl-Luft-Gemisch um 180° um und leitet das Gemisch in das Gehäuse 4.The cover plate 12 fixed to the crankcase 2 has an annular receiving groove 18 in which the free End face of the partition 10 is added. In the receiving groove 18 is a sealing ring 19 is arranged to the interior of the Oil separator flow-tight against the crankcase interior to complete and prevent incorrect air flows. The face the partition 10 is rotatably received in the receiving groove 18. In the end cover 12 there is an axial outflow opening 7 provided, through which the housing interior with the intake tract the internal combustion engine is connected. Between the Crankcase interior facing the inside of the end cover 12 and the housing 4 of the oil separator 3 is a feed channel 13 formed over which the oil-air mixture from the Crankcase interior is passed into the inflow channel 6. The feed channel 13 directs the axially flowing oil-air mixture by 180 ° and directs the mixture into the housing 4.

Der Zuführkanal ist nicht erforderlich, wenn die Einströmöffnung des Ölabscheiders auf der gegenüberliegenden, dem Abschlußdeckel abgewandten Seite angeordnet ist.The feed channel is not necessary when the inflow opening of the oil separator on the opposite end cover opposite side is arranged.

Im Einströmkanal 6 sind Schikanen 11 angeordnet, die in Form von winklig verlaufenden Stegen in den freien Strömungsquerschnitt des Einströmkanals 6 einragen. Es sind in Strömungsrichtung mehrere hintereinander angeordnete Schikanen 11 vorgesehen, die zweckmäßig abwechselnd von gegenüberliegenden Seiten in den Einströmkanal einragen. Im Bereich der Einströmöffnung ragt eine Schikane 11, die einteilig mit dem zweiten Aufbaukörper 17 des Gehäuses 4 ausgebildet ist, in den Einströmkanal 6 ein. Eine weitere Schikane 11 ist an der Trennwand 10 befestigt. Das Öl-Luft-Gemisch wird gemäß den eingezeichneten Strömungspfeilen mehrfach um 180° im Einströmkanal 6 um die Schikanen 11 umgelenkt.In the inflow channel 6 baffles 11 are arranged, which are in shape of angled webs into the free flow cross section of the inflow channel 6 protrude. They are in the direction of flow several baffles 11 arranged one behind the other are provided, which expediently alternate from opposite Insert sides into the inflow channel. In the area of the inflow opening protrudes a chicane 11, which is integral with the second body 17 of the housing 4 is formed in the inflow channel 6. Another chicane 11 is on the Partition 10 attached. The oil-air mixture is according to the drawn flow arrows several times by 180 ° in the inflow channel 6 deflected around the baffles 11.

In der Außenwand 8 des Einströmkanals 6 sind Abströmbohrungen 9 für abgeschiedenes Öl eingebracht, die zweckmäßig gleichmäßig über den Umfang der Außenwand 8 verteilt sind, wobei axial sowohl im Grundkörper 15 als auch im ersten Aufbaukörper 16 und gegebenenfalls auch im zweiten Aufbaukörper 17 Abströmbohrungen 9 vorgesehen sind. Anstelle von Abströmbohrungen können auch Öffnungen mit beliebigem Querschnitt, beispielsweise Spalte, vorgesehen sein. Aus konstruktiven Gründen kann es auch vorteilhaft sein, die Abströmbohrungen über den Umfang ungleichmäßig verteilt anzuordnen.In the outer wall 8 of the inflow channel 6 there are outflow bores 9 introduced for separated oil, which is expediently even are distributed over the circumference of the outer wall 8, wherein axially both in the base body 15 and in the first body 16 and optionally also in the second body 17 outflow bores 9 are provided. Instead of drain holes can also have openings of any cross-section, for example Column. For design reasons it may also be advantageous to use the outflow bores arrange the circumference unevenly.

Die Ölabscheidung funktioniert wie folgt:
Das Öl-Luft-Gemisch aus dem Kurbelgehäuseinnenraum strömt in Richtung der eingetragenen Strömungspfeile in den Zuführkanal 13 und weiter in den Einströmkanal 6, wobei das Gemisch durch die Schikanen 11 geleitet wird und an den Wänden der Schikanen bzw. an der Innenseite der Außenwand 8 abgeschieden wird. Infolge der Rotationsbewegung des drehfest mit der Ausgleichswelle 14 verbundenen Gehäuses 4 wirken Zentrifugalkräfte auf die Ölpartikel, so daß die Ölpartikel an die Innenseite der Außenwand 8 gedrückt werden und über die Abströmbohrungen 9 radial nach außen zurück in den Kurbelgehäuseinnenraum strömen. Die Strömung wird durch die Rotationsbewegung nicht beeinträchtigt, so daß die von den Ölpartikel befreite Reinluft in den Gehäuseinnenraum eintreten und über die Abströmöffnung 7 den Ölabscheider 3 verlassen kann.
The oil separation works as follows:
The oil-air mixture from the crankcase interior flows in the direction of the entered flow arrows into the feed channel 13 and further into the inflow channel 6, the mixture being passed through the baffles 11 and separated on the walls of the baffles or on the inside of the outer wall 8 becomes. As a result of the rotational movement of the housing 4, which is non-rotatably connected to the balancer shaft 14, centrifugal forces act on the oil particles, so that the oil particles are pressed against the inside of the outer wall 8 and flow radially outward through the outflow bores 9 back into the crankcase interior. The flow is not impaired by the rotational movement, so that the clean air freed from the oil particles can enter the interior of the housing and leave the oil separator 3 via the outflow opening 7.

Claims (11)

Entlüftungsvorrichtung für ein Kurbelgehäuse einer Brennkraftmaschine, mit einem um eine Drehachse (5) drehbar gelagerten und antreibbaren Zentrifugal-Ölabscheider (3), der ein Gehäuse (4) mit einem Einströmkanal (6) für die Zufuhr eines Öl-Luft-Gemisches und eine Abströmöffnung (7) für die Ableitung von Reinluft aufweist,
dadurch gekennzeichnet,
daß der Einströmkanal (6) mit radialem Versatz und im wesentlichen achsparallel zur Drehachse (5) des Ölabscheiders (3) verläuft.
Ventilation device for a crankcase of an internal combustion engine, with a centrifugal oil separator (3) rotatably mounted and drivable about an axis of rotation (5), which has a housing (4) with an inflow channel (6) for the supply of an oil-air mixture and an outflow opening (7) for the removal of clean air,
characterized,
that the inflow channel (6) runs with a radial offset and essentially axially parallel to the axis of rotation (5) of the oil separator (3).
Entlüftungsvorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Außenwand (8) des Einströmkanals (6) Teil der Wandung des Gehäuses (4) ist.
Venting device according to claim 1,
characterized,
that the outer wall (8) of the inflow channel (6) is part of the wall of the housing (4).
Entlüftungsvorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß in der Außenwand (8) des Einströmkanals (6) Abströmbohrungen (9) für abströmendes Öl vorgesehen sind.
Venting device according to claim 1 or 2,
characterized,
that outflow bores (9) for outflowing oil are provided in the outer wall (8) of the inflow channel (6).
Entlüftungsvorrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß zwischen dem Einströmkanal (6) und dem Innenraum des Ölabscheiders (3) eine Trennwand (10) ausgebildet ist.
Venting device according to one of claims 1 to 3,
characterized,
that a partition (10) is formed between the inflow channel (6) and the interior of the oil separator (3).
Entlüftungsvorrichtung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß der Einströmkanal (6) ringförmig ausgebildet ist.
Venting device according to one of claims 1 to 4,
characterized,
that the inflow channel (6) is annular.
Entlüftungsvorrichtung nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß im Einströmkanal (6) Schikanen (11) für die Ölabscheidung angeordnet sind.
Venting device according to one of claims 1 to 5,
characterized,
that baffles (11) for the oil separation are arranged in the inflow channel (6).
Entlüftungsvorrichtung nach Anspruch 6,
dadurch gekennzeichnet,
daß die Schikanen (11) als winklig in den Einströmkanal (6) einragende Stege ausgebildet sind.
Venting device according to claim 6,
characterized,
that the baffles (11) are designed as webs projecting at an angle into the inflow channel (6).
Entlüftungsvorrichtung nach Anspruch 6 oder 7,
dadurch gekennzeichnet,
daß in Achsrichtung des Einströmkanals (6) zumindest zwei hintereinanderliegende Schikanen (11) angeordnet sind.
Venting device according to claim 6 or 7,
characterized,
that at least two baffles (11) are arranged one behind the other in the axial direction of the inflow channel (6).
Entlüftungsvorrichtung nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
daß ein am Kurbelgehäuse (2) befestigter Abschlußdeckel (12) des Gehäuses (4) vorgesehen ist und zwischen dem Abschlußdeckel (12) und dem Gehäuse (4) ein dem Einströmkanal (6) vorgelagerter und mit diesem kommunizierender Zuführkanal (13) ausgebildet ist.
Venting device according to one of claims 1 to 8,
characterized,
that an end cover (12) of the housing (4) attached to the crankcase (2) is provided and between the end cover (12) and the housing (4) an inlet duct (6) upstream and communicating with the inlet duct (6) is formed.
Entlüftungsvorrichtung nach Anspruch 9,
dadurch gekennzeichnet,
daß der Zuführkanal (13) eine 180°-Umlenkung erfährt.
Venting device according to claim 9,
characterized,
that the feed channel (13) undergoes a 180 ° deflection.
Entlüftungsvorrichtung nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet,
daß das Gehäuse (4) des Zentrifugal-Ölabscheiders (3) drehfest mit einer Motor-Ausgleichswelle (14) verbunden ist.
Venting device according to one of claims 1 to 10,
characterized,
that the housing (4) of the centrifugal oil separator (3) is rotatably connected to an engine balancer shaft (14).
EP98123975A 1998-01-31 1998-12-17 Device for crankcase ventilation for an internal combusion engine Expired - Lifetime EP0933507B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803872 1998-01-31
DE19803872A DE19803872C2 (en) 1998-01-31 1998-01-31 Ventilation device for a crankcase of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP0933507A1 true EP0933507A1 (en) 1999-08-04
EP0933507B1 EP0933507B1 (en) 2002-09-25

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US (1) US5954035A (en)
EP (1) EP0933507B1 (en)
DE (2) DE19803872C2 (en)

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DE19803872C2 (en) 2001-05-10
EP0933507B1 (en) 2002-09-25
US5954035A (en) 1999-09-21
DE59805683D1 (en) 2002-10-31
DE19803872A1 (en) 1999-08-05

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