EP0964982A1 - Ventilation device for a crankcase of an internal combustion engine - Google Patents

Ventilation device for a crankcase of an internal combustion engine

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Publication number
EP0964982A1
EP0964982A1 EP98909439A EP98909439A EP0964982A1 EP 0964982 A1 EP0964982 A1 EP 0964982A1 EP 98909439 A EP98909439 A EP 98909439A EP 98909439 A EP98909439 A EP 98909439A EP 0964982 A1 EP0964982 A1 EP 0964982A1
Authority
EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
gas
space
mass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98909439A
Other languages
German (de)
French (fr)
Other versions
EP0964982B1 (en
Inventor
Hans BRÜGGEMANN
Hansjörg FINKBEINER
Martin Schmid
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 AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP0964982A1 publication Critical patent/EP0964982A1/en
Application granted granted Critical
Publication of EP0964982B1 publication Critical patent/EP0964982B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01M3/00—Lubrication specially adapted for engines with crankcase compression of fuel-air mixture or for other engines in which lubricant is contained in fuel, combustion air, or fuel-air mixture
    • F01M3/04—Lubrication specially adapted for engines with crankcase compression of fuel-air mixture or for other engines in which lubricant is contained in fuel, combustion air, or fuel-air mixture for upper cylinder lubrication only
    • 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
    • F01M2013/0422—Separating 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.
  • a generic ventilation device " for a crankcase of an internal combustion engine in which the blow-by oil mixture is made the crankcase for oil separation is guided into a housing in which a balancer shaft is mounted.
  • the balancer shaft comprises a pipe section with openings which forms a separation space and is arranged between two balancer weights.
  • the rotating balancer shaft displaces the blow which has flowed from the crankcase into the housing of the balancer shaft -by-oil mixture also in rotation, whereby the oil droplets contained in the blow-by gases are mostly thrown against the outer wall of the balancer shaft and run from the housing of the balancer shaft into the oil pan of the engine.
  • the pure blow-by gases pass through the openings of the pipe section in the separation chamber of the balancer shaft and vo n there in an intake system of the internal combustion engine.
  • a major advantage of the ventilation devices according to the invention is the increase in the oil separation rate.
  • the spatial separation of the openings for feeding the blow-by oil mixture into the mass balance weights, the radial bores for the subsequent discharge of the oil droplets separated in the mass balance weights and the gas routing space for the discharge of the blow-by gas into the intake system of the internal combustion engine prevents entrainment of already deposited oil droplets in the intake system. Due to the centrifugal forces acting on the blow-by-oil mixture due to the rotating balance shaft, air and oil in the mass balance weights are inevitably separated from each other, whereby air and oil are passed on through different holes after the separation. No additional parts are required, since the ventilation device can be integrated into the balance shaft and the mass balance weights.
  • the machining effort is low because only holes in the balance shaft and the mass balance weights have to be drilled. An additional separation room can be omitted.
  • the centrifugal force acting on the oil is significantly greater than the gravity also acting on the oil, so that the oil-discharging radial bores can be arranged at any point on the circumference of the mass balance weights and any inclination of the Internal combustion engine or the vehicle remains without influence on the oil separation.
  • FIG. 1 shows a schematic diagram of a venting device according to the invention with feed bores and radial bores introduced into mass balancing weights of a balancer shaft and a gas guide space arranged in the balancer shaft according to a first exemplary embodiment
  • Fig. 2 is a schematic diagram of a venting device according to the invention with a gas guide space arranged in a balance shaft and radial bores made in mass balance weights of the balance shaft according to a second exemplary embodiment.
  • the internal combustion engine has a rotating balance shaft 2 with mass balance weights 3 and 4, which is mounted in a space 5 connected to the crankcase in the cylinder head 6 above gas exchange valves of the internal combustion engine, not shown here.
  • the room 5 is closed off at the top by means of a cover 7.
  • the balance shaft 2 has one in the direction of its rotation axis 8 extending Gas Evaluations syndromem 9 which is closed at one end 9a and a gas-releasing end 9b via a down tightly sealed to the outside chamber 10 with the only partially shown suction system 1 1 of the internal combustion engine is connected, whereby a negative pressure in the venting device 1 prevails.
  • two mutually opposite openings 12 are arranged on the end faces, which open into feed bores 13 running axially and parallel to the axis of rotation 8 of the balance shaft 2.
  • the feed bores 13 are connected to radial bores 14 which are also introduced into the mass balancing weights 3, 4 and which open into the space 5 outside the balancing shaft 2 and diagonally into the gas guide space 9 of the balancing shaft 2.
  • the blow-by-oil mixture emerging from the crankcase of the internal combustion engine passes via the space 5 surrounding the balancer shaft 2, due to the negative pressure prevailing in the ventilation device 1, into the openings 12 in the front of the rotating mass balance weights 3 and 4.
  • the gas flows from the openings 12 Oil mixture into the axially extending feed bores 13 of the rotating mass balance weights 3 and 4.
  • the centrifugal forces acting on the mixture cause the oil to be thrown off, which is deposited on the walls of the feed bores 13. Due to the centrifugal forces acting on the oil, the separated oil passes through the radial bores 14 of the mass balancing weights 3, 4 into the space 5 outside the balancing shaft 2 and drips into the oil pan of the internal combustion engine.
  • balance shaft 2 including the mass balance weights 3, 4 attached to it, rotates about the axis of rotation 8 at a high rotational speed, it is impossible for the oil droplets, in contrast to the gases, to get into the gas guide space 9 within the balance shaft 2 via the oil-discharging radial bores 14.
  • a reduction in the diameter of the end face facing the space 5 outside the balancer shaft 2 is not shown here. range 15 of the radial bores 14 and the associated increase in outflow resistance can additionally be achieved that only the separated oil and not the air in the space 5 outside the balancer shaft 2.
  • the blow-by gas takes the opposite path to the oil through the radial bores 14 and reaches the suction system via the gas guide space 9 and the adjoining chamber 10, which is airtight and sealed off from the environment 11 of the internal combustion engine.
  • the path of the blow-by mixture is indicated by arrows in FIGS. 1 and 2, the solid arrows indicating the path of the air and the dashed arrows indicating the path of the oil.
  • FIG. 2 shows a schematic exploded drawing of a further exemplary embodiment of a ventilation device 16 according to the invention.
  • the balance shaft 2 of the internal combustion engine has an opening 17 at the end 2a at the end for the entry of the blow-by mixture from the crankcase, which opens into a gas guide space 18, which has separation spaces 18a, 18b within the mass balance weights 3, 4A.
  • the mass balancing weights 3, 4 only have oil-carrying radial bores 19, which are connected on the one hand to the gas routing space 18 of the balancing shaft 2 and on the other hand to the space 5 outside the balancing shaft 2.
  • the gas routing chamber 18 of the balancer shaft 2 is connected to the intake system 11 of the internal combustion engine via the flow-calming chamber 10.
  • the blow-by mixture passes from the crankcase of the internal combustion engine via the opening 17 arranged at the end at the end 2a of the balance shaft 2 into the gas guide space 18 and thus into the separating spaces 18a, 18b of the balance shaft 2 rotating about the axis of rotation 8 the rotation of the balance shaft 2 and the mass balance weights 3, 4 on the Mixing centrifugal forces cause the oil to be ejected via the radial bores 19 of the mass balance weights 3, 4 into the space 5 outside the balance shaft 2, from where the oil drips into the oil pan of the internal combustion engine.
  • the blow-by gases are fed to the intake system 11 of the internal combustion engine via the chamber 10 adjoining a gas-discharging end 18c of the gas guide space 18.
  • the number of mass balance weights used for the ventilation device can vary, which would also make it conceivable to use only one mass balance weight.
  • the chamber arranged between the suction system and the venting device enables optimal sealing, for example by the chamber having a connection piece molded onto the chamber wall for connection to the suction system and the balance shaft being mounted in the chamber at its gas-discharging end by means of a shaft sealing ring.
  • the oil separation according to the two exemplary embodiments can be coordinated by varying the position, the diameter and the angle of the radial and axial bores.
  • the wetting area in the radial bores can be increased by introducing steel wool.

Abstract

The invention relates to a ventilation device (1) for a crankcase of an internal combustion engine with a balancer shaft (2) with mass-balance weights (3, 4), which is embodied in the cylinder head above the gas shuttle valves of the internal combustion engine, and which has at least one opening at least for the entry of gas, as well as a gas flow control chamber (9) which passes inside the balancer shaft (2), which gas flow control chamber is connected with a suction system of the internal combustion engine; a chamber fitted outside the balancer shaft is connected to the crankcase. The invention seeks to design a ventilation device for the crankhouse of an internal combustion engine, which device has improved oil separation capacity while being easy to construct. To this end, the at least one opening (12) is fitted in at least one mass-balance weight (3, 4) and discharges onto at least one axially running feeder bore hole (13) which is connected with at least one oil-draining radial bore hole (14) embodied in the mass-balance weight.

Description

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Die Erfindung bezieht sich auf eine Entlüftungsvorrichtung für ein Kurbelgehäuse einer Brennkraftmaschine gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a ventilation device for a crankcase of an internal combustion engine according to the preamble of claim 1.
Aus dem SAE (Society of Automotive Engineers) Paper (Feb. 1992) "Cosworth MBA Engine", Poole et al., S. 8 ist eine gattungsgemäße Entlüftungsvorrichtung "für ein Kurbelgehäuse einer Brennkraftmaschine bekannt, bei der das blow-by-Ölgemisch aus dem Kurbelgehäuse zur Olabscheidung in ein Gehäuse geführt wird, in dem eine Ausgleichswelle gelagert ist. Die Ausgleichswelle umfaßt ein einen Abscheideraum bildendes Rohrstück mit Öffnungen, das zwischen zwei Ausgleichsgewichten angeordnet ist. Die rotierende Ausgleichswelle versetzt das aus dem Kurbelgehäuse in das Gehäuse der Ausgleichswelle eingeströmte blow-by-Ölgemisch ebenfalls in Rotation, wobei die in den blow-by-Gasen enthaltenen Öltröpfchen größtenteils gegen die Außenwand der Ausgleichswelle geschleudert werden und vom Gehäuse der Ausgleichswelle in die Ölwanne der Brennkraftmaschine ablaufen. Die reinen blow-by-Gase gelangen über die Öffnungen des Rohrstückes in den Abscheideraum der Ausgleichswelle und von dort in ein Ansaugsystem der Brennkraftmaschine. Ein kleinerer Teil der Öltröpfchen gelangt dennoch mit den blow-by-Gasen in den Abscheideraum der Ausgleichswelle, wird gegen die Innenwand des Rohrstückes geschleudert und gelangt über die Öffnungen des Rohrstückes wieder in das die Ausgleichswelle umgebende Gehäuse, wobei allerdings die durch dieselben Öffnungen in die Ausgleichswelle einströmenden blow-by-Gase die gerade austretenden Öltröpfchen wieder mitreißen können. Ferner bedeutet das als Abscheideraum eingesetzte Rohrstück einen zusätzlichen baulichen Aufwand der Entlüftungsvorrichtung.From the SAE (Society of Automotive Engineers) Paper (Feb. 1992) "Cosworth MBA Engine", Poole et al., P. 8, a generic ventilation device " for a crankcase of an internal combustion engine is known in which the blow-by oil mixture is made the crankcase for oil separation is guided into a housing in which a balancer shaft is mounted. The balancer shaft comprises a pipe section with openings which forms a separation space and is arranged between two balancer weights. The rotating balancer shaft displaces the blow which has flowed from the crankcase into the housing of the balancer shaft -by-oil mixture also in rotation, whereby the oil droplets contained in the blow-by gases are mostly thrown against the outer wall of the balancer shaft and run from the housing of the balancer shaft into the oil pan of the engine. The pure blow-by gases pass through the openings of the pipe section in the separation chamber of the balancer shaft and vo n there in an intake system of the internal combustion engine. A smaller part of the oil droplets with the blow-by gases nevertheless get into the separating chamber of the balancer shaft, are thrown against the inner wall of the pipe section and reach the housing surrounding the balancer shaft via the openings of the pipe section, whereby however through the same openings into the Blow-by gases flowing into the balance shaft can carry the oil droplets that are just escaping again. It also means as Separation space used pipe piece an additional structural effort of the ventilation device.
Zum allgemeinen technischen Hintergrund wird noch auf die US-PS 5 542 402 und US-PS 5 261 380 verwiesen.For general technical background, reference is also made to US Pat. No. 5,542,402 and US Pat. No. 5,261,380.
Es ist die Aufgabe der Erfindung eine Entlüftungsvorrichtung derart auszubilden, daß bei geringem baulichen Aufwand der Öl- abscheidegrad der Vorrichtung verbessert wird.It is the object of the invention to design a ventilation device in such a way that the degree of oil separation of the device is improved with little construction effort.
Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruchs 1 gegebenen Merkmale gelöst.This object is achieved by the features given in the characterizing part of patent claim 1.
Ein wesentlicher Vorteil der erfindungsgemäßen Entlüftungsvorrichtungen liegt in der Erhöhung der Ölabscheiderate . Die räumliche Trennung der Öffnungen zur Zuführung des blow-by-Ölgemi- sches in die Massenausgleichsgewichte, der Radialbohrungen zur anschließenden Abführung der in den Massenausgleichsgewichten abgeschiedenen Öltröpfchen und des Gasführungsräumes zur Abführung des blow-by-Gases in das Ansaugsystem der Brennkraftmaschine verhindert ein Mitreißen von bereits abgeschiedenen Öltröpfchen in das Ansaugsystem. Durch die aufgrund der rotierenden Ausgleichswelle auf das blow-by-Ölgemisch wirkenden Zentrifugalkräfte werden Luft und Öl in den Massenausgleichsgewichten zwangsläufig voneinander getrennt, wobei Luft und Öl nach der Trennung durch unterschiedliche Bohrungen weitergeleitet werden. Es ist kein zusätzlicher Teileaufwand erforderlich, da die Entlüftungsvorrichtung in die Ausgleichswelle und die Massenausgleichsgewichte integrierbar is . Der Bearbeitungsaufwand ist gering, da nur Bohrungen in der Ausgleichswelle und den Massenausgleichsgewichten einzubringen sind. Ein zusätzlicher Abscheideraum kann entfallen. Die auf das Öl wirkende Zentrifugalkraft ist wesentlich größer als die auf das Öl ebenfalls wirkende Schwerkraft, so daß die ölabführenden Radialbohrungen an jeder beliebigen Stelle am Umfang der Massenausgleichsgewichte angeordnet werden können und eine etwaige Schräglage der Brennkraftmaschine bzw. des Fahrzeugs ohne Einfluß auf die Olabscheidung bleibt.A major advantage of the ventilation devices according to the invention is the increase in the oil separation rate. The spatial separation of the openings for feeding the blow-by oil mixture into the mass balance weights, the radial bores for the subsequent discharge of the oil droplets separated in the mass balance weights and the gas routing space for the discharge of the blow-by gas into the intake system of the internal combustion engine prevents entrainment of already deposited oil droplets in the intake system. Due to the centrifugal forces acting on the blow-by-oil mixture due to the rotating balance shaft, air and oil in the mass balance weights are inevitably separated from each other, whereby air and oil are passed on through different holes after the separation. No additional parts are required, since the ventilation device can be integrated into the balance shaft and the mass balance weights. The machining effort is low because only holes in the balance shaft and the mass balance weights have to be drilled. An additional separation room can be omitted. The centrifugal force acting on the oil is significantly greater than the gravity also acting on the oil, so that the oil-discharging radial bores can be arranged at any point on the circumference of the mass balance weights and any inclination of the Internal combustion engine or the vehicle remains without influence on the oil separation.
Durch Dimensionierung des Abströmwiderstandes mittels Verkleinerung des Durchmessers im Endbereich der ölabführenden Radial- bohrungen kann erreicht werden, daß nur Öl aus den Radialbohrungen austritt, die Luft hingegen nicht.By dimensioning the outflow resistance by reducing the diameter in the end region of the oil-discharging radial bores, it can be achieved that only oil emerges from the radial bores, but not the air.
Weitere Ausgestaltungen der Erfindung gehen aus den übrigen Unteransprüchen und der Beschreibung hervor.Further refinements of the invention emerge from the remaining subclaims and the description.
Zwei Ausführungsbeispiele der Erfindung sind im folgenden in zwei Zeichnungen mit weiteren Einzelheiten näher erläutert, und zwar zeigen:Two exemplary embodiments of the invention are explained in more detail in the following in two drawings, namely:
Fig. 1 eine Prinzipskizze einer erfindungsgemäßen Entlüftungsvorrichtung mit in Massenausgleichsgewichten einer Ausgleichswelle eingebrachten Zuführbohrungen und Radial- bohrungen sowie einem in der Ausgleichswelle angeordneten Gasführungsräum gemäß einem ersten Ausführungsbei- spiel und1 shows a schematic diagram of a venting device according to the invention with feed bores and radial bores introduced into mass balancing weights of a balancer shaft and a gas guide space arranged in the balancer shaft according to a first exemplary embodiment and
Fig. 2 eine Prinzipskizze einer erfindungsgemäßen Entlüftungsvorrichtung mit einem in einer Ausgleichswelle angeordneten Gasführungsräum und in Massenausgleichsgewichten der Ausgleichswelle eingebrachten Radialbohrungen gemäß einem zweiten Ausführungsbeipiel .Fig. 2 is a schematic diagram of a venting device according to the invention with a gas guide space arranged in a balance shaft and radial bores made in mass balance weights of the balance shaft according to a second exemplary embodiment.
Die schematische Explosionszeichnung gemäß Fig. 1 zeigt eine erfindungsgemäße Entlüftungsvorrichtung 1 eines Kurbelgehäuses einer nicht näher dargestellten Brennkraftmaschine. Die Brenn- kraft aschine weist eine rotierende Ausgleichswelle 2 mit Massenausgleichsgewichten 3 und 4 auf, welche in einem mit dem Kurbelgehäuse verbundenen Raum 5 im Zylinderkopf 6 oberhalb hier nicht dargestellter Gaswechselventile der Brennkraftmaschine gelagert ist. Der Raum 5 ist mittels einer Abdeckhaube 7 nach oben hin abgeschlossen. Die Ausgleichswelle 2 weist einen in Richtung ihrer Rotationsachse 8 verlaufenden Gasführungsräum 9 auf, der an einem Ende 9a verschlossen und an einem gasabführenden Ende 9b über eine nach außen hin dicht abgeschlossene Kammer 10 mit dem nur teilweise dargestellten Ansaugsystem 11 der Brennkraftmaschine verbunden ist, wodurch ein Unterdruck in der EntlüftungsVorrichtung 1 herrscht .1 shows a ventilation device 1 according to the invention of a crankcase of an internal combustion engine, not shown in detail. The internal combustion engine has a rotating balance shaft 2 with mass balance weights 3 and 4, which is mounted in a space 5 connected to the crankcase in the cylinder head 6 above gas exchange valves of the internal combustion engine, not shown here. The room 5 is closed off at the top by means of a cover 7. The balance shaft 2 has one in the direction of its rotation axis 8 extending Gasführungsräum 9 which is closed at one end 9a and a gas-releasing end 9b via a down tightly sealed to the outside chamber 10 with the only partially shown suction system 1 1 of the internal combustion engine is connected, whereby a negative pressure in the venting device 1 prevails.
In den Massenausgleichsgewichten 3, 4 sind stirnseitig jeweils zwei einander gegenüberliegende Öffnungen 12 angeordnet, die in axial und parallel zu der Rotationsachse 8 der Ausgleichswelle 2 verlaufende Zuführbohrungen 13 münden. Die Zuführbohrungen 13 sind mit ebenfalls in den Massenausgleichsgewichten 3, 4 eingebrachten Radialbohrungen 14 verbunden, welche in den Raum 5 außerhalb der Ausgleichswelle 2 und schräg in den Gasführungsräum 9 der Ausgleichswelle 2 münden.In the mass balance weights 3, 4, two mutually opposite openings 12 are arranged on the end faces, which open into feed bores 13 running axially and parallel to the axis of rotation 8 of the balance shaft 2. The feed bores 13 are connected to radial bores 14 which are also introduced into the mass balancing weights 3, 4 and which open into the space 5 outside the balancing shaft 2 and diagonally into the gas guide space 9 of the balancing shaft 2.
Das aus dem Kurbelgehäuse der Brennkraftmaschine austretende blow-by-Ölgemisch gelangt über den die Ausgleichswelle 2 umgebenden Raum 5 aufgrund des in der Entlüftungsvorrichtung 1 herrschenden Unterdrucks in die stirnseitig angebrachten Öffnungen 12 der rotierenden Massenausgleichsgewichte 3 und 4. Von den Öffnungen 12 aus strömt das Gas-Öl-Gemisch in die axial verlaufenden Zuführbohrungen 13 der rotierenden Massenaus- gleichsgewichte 3 und 4. Die auf das Gemisch wirkenden Zentrifugalkräfte bewirken ein Abschleudern des Öles, welches sich an den Wänden der Zuführbohrungen 13 abscheidet. Das abgeschiedene Öl gelangt aufgrund der auf das Öl wirkenden Zentrifugalkräfte über die Radialbohrungen 14 der Massenausgleichsgewichte 3, 4 in den Raum 5 außerhalb der Ausgleichswelle 2 und tropft in die Ölwanne der Brennkraftmaschine ab. Da die Ausgleichswelle 2 inklusive der darauf befestigten Massenausgleichsgewichte 3 , 4 um die Rotationsachse 8 mit einer hohen Drehgeschwindigkeit rotiert, ist es den Öltröpfchen im Gegensatz zu den Gasen unmöglich über die ölabführenden Radialbohrungen 14 in den Gasfüh- rungsraum 9 innerhalb der Ausgleichswelle 2 zu gelangen. Über eine hier nicht dargestellte Verkleinerung des Durchmessers der dem Raum 5 außerhalb der Ausgleichswelle 2 zugewandten Endbe- reichen 15 der Radialbohrungen 14 und der damit verbundenen Erhöhung des Abströmwiderstandes kann zusätzlich erreicht werden, daß nur das abgeschiedene Öl und nicht die Luft in den Raum 5 außerhalb der Ausgleichswelle 2 austritt. Aufgrund des in der Entlüftungsvorrichtung 1 herrschenden Unterdrucks nimmt das blow-by-Gas den gegenüber dem Weg des Öles entgegengesetzten Weg durch die Radialbohrungen 14 und gelangt über den Gasführungsraum 9 sowie die daran anschließende, zur Umgebung hin luftdicht abgeschlossene und strömungsberuhigende Kammer 10 in das Ansaugsystem 11 der Brennkraftmaschine. Der Weg des blow- by-Gemisches ist in den Figuren 1 und 2 durch Pfeile gekennzeichnet, wobei die durchgezogenen Pfeile den Weg der Luft und die gestrichelten Pfeile den Weg des Öles kennzeichnen.The blow-by-oil mixture emerging from the crankcase of the internal combustion engine passes via the space 5 surrounding the balancer shaft 2, due to the negative pressure prevailing in the ventilation device 1, into the openings 12 in the front of the rotating mass balance weights 3 and 4. The gas flows from the openings 12 Oil mixture into the axially extending feed bores 13 of the rotating mass balance weights 3 and 4. The centrifugal forces acting on the mixture cause the oil to be thrown off, which is deposited on the walls of the feed bores 13. Due to the centrifugal forces acting on the oil, the separated oil passes through the radial bores 14 of the mass balancing weights 3, 4 into the space 5 outside the balancing shaft 2 and drips into the oil pan of the internal combustion engine. Since the balance shaft 2, including the mass balance weights 3, 4 attached to it, rotates about the axis of rotation 8 at a high rotational speed, it is impossible for the oil droplets, in contrast to the gases, to get into the gas guide space 9 within the balance shaft 2 via the oil-discharging radial bores 14. A reduction in the diameter of the end face facing the space 5 outside the balancer shaft 2 is not shown here. range 15 of the radial bores 14 and the associated increase in outflow resistance can additionally be achieved that only the separated oil and not the air in the space 5 outside the balancer shaft 2. Due to the negative pressure prevailing in the venting device 1, the blow-by gas takes the opposite path to the oil through the radial bores 14 and reaches the suction system via the gas guide space 9 and the adjoining chamber 10, which is airtight and sealed off from the environment 11 of the internal combustion engine. The path of the blow-by mixture is indicated by arrows in FIGS. 1 and 2, the solid arrows indicating the path of the air and the dashed arrows indicating the path of the oil.
Fig. 2 zeigt eine schematische Explosionszeichnung eines weiteren Ausführungsbeispieles einer erfindungsgemäßen Entlüftungs- vorrichtung 16. Der Einfachheit halber werden in Fig. 2 für übereinstimmende Bauelemente aus Fig. 1 die dort verwendeten Bezugszeichen übernommen. Die Ausgleichswelle 2 der Brennkraftmaschine weist eine an einem Ende 2a stirnseitig eingebrachte Öffnung 17 zum Eintritt des blow-by-Gemisches aus dem Kurbelgehäuse auf, die in einen Gasführungsraum 18 mündet, welcher innerhalb der Massenausgleichsgewichte 3, 4 A scheideräume 18a, 18b aufweist. Im Gegensatz zum ersten Ausführungsbeispiel weisen die Massenausgleichsgewichte 3, 4 nur ölabführende Radial- bohrungen 19 auf, die einerseits mit dem Gasführungsraum 18 der Ausgleichswelle 2 und andererseits mit dem Raum 5 außerhalb der Ausgleichswelle 2 in Verbindung stehen. Der Gasführungsraum 18 der Ausgleichswelle 2 ist über die strömungsberuhigende Kammer 10 mit dem Ansaugsystem 11 der Brennkraftmaschine verbunden.FIG. 2 shows a schematic exploded drawing of a further exemplary embodiment of a ventilation device 16 according to the invention. For the sake of simplicity, the reference symbols used there are used in FIG. 2 for matching components from FIG. 1. The balance shaft 2 of the internal combustion engine has an opening 17 at the end 2a at the end for the entry of the blow-by mixture from the crankcase, which opens into a gas guide space 18, which has separation spaces 18a, 18b within the mass balance weights 3, 4A. In contrast to the first exemplary embodiment, the mass balancing weights 3, 4 only have oil-carrying radial bores 19, which are connected on the one hand to the gas routing space 18 of the balancing shaft 2 and on the other hand to the space 5 outside the balancing shaft 2. The gas routing chamber 18 of the balancer shaft 2 is connected to the intake system 11 of the internal combustion engine via the flow-calming chamber 10.
Das blow-by-Gemisch gelangt vom Kurbelgehäuse der Brennkraftmaschine über die an dem Ende 2a der Ausgleichswelle 2 stirnsei- tig angeordnete Öffnung 17 in den Gasführungsraum 18 und damit in die Abscheideräume 18a, 18b der sich um die Rotationsachse 8 drehenden Ausgleichswelle 2. Die durch die Rotation der Ausgleichswelle 2 und der Massenausgleichsgewichte 3, 4 auf das Gemisch wirkenden Zentrifugalkräfte bewirken ein Ausschleudern des Öles über die Radialbohrungen 19 der Massenausgleichsgewichte 3, 4 in den Raum 5 außerhalb der Ausgleichswelle 2, von wo das Öl in die Ölwanne der Brennkraftmaschine abtropft. Die blow-by-Gase werden über die an einem gasabführenden Ende 18c des Gasführungsräumes 18 anschließende Kammer 10 dem Ansaugsystem 11 der Brennkraftmaschine zugeführt .The blow-by mixture passes from the crankcase of the internal combustion engine via the opening 17 arranged at the end at the end 2a of the balance shaft 2 into the gas guide space 18 and thus into the separating spaces 18a, 18b of the balance shaft 2 rotating about the axis of rotation 8 the rotation of the balance shaft 2 and the mass balance weights 3, 4 on the Mixing centrifugal forces cause the oil to be ejected via the radial bores 19 of the mass balance weights 3, 4 into the space 5 outside the balance shaft 2, from where the oil drips into the oil pan of the internal combustion engine. The blow-by gases are fed to the intake system 11 of the internal combustion engine via the chamber 10 adjoining a gas-discharging end 18c of the gas guide space 18.
Die Anzahl der für die Entlüftungsvorrichtung verwendeten Massenausgleichsgewichte kann variieren, wodurch auch der Einsatz nur eines Massenausgleichsgewichtes denkbar wäre. Die zwischen Ansaugsystem und EntlüftungsVorrichtung angeordnete Kammer ermöglicht eine optimale Abdichtung, indem die Kammer beispielsweise einen an die Kammerwand angeformten Stutzen zum Anschluß an das Ansaugsystem aufweist und die Ausgleichswelle an ihrem gasabführenden Ende mittels eines Wellendichtringes in der Kammer gelagert ist. Ferner kann eine Abstimmung der Olabscheidung gemäß den beiden Ausführungsbeispielen durch die Variation der Lage, der Durchmesser und der Winkel der Radial- und Axialbohrungen vorgenommen werden. Zusätzlich kann die Benetzungsflache in den Radialbohrungen durch Einbringen von Stahlwolle vergrößert werden. The number of mass balance weights used for the ventilation device can vary, which would also make it conceivable to use only one mass balance weight. The chamber arranged between the suction system and the venting device enables optimal sealing, for example by the chamber having a connection piece molded onto the chamber wall for connection to the suction system and the balance shaft being mounted in the chamber at its gas-discharging end by means of a shaft sealing ring. Furthermore, the oil separation according to the two exemplary embodiments can be coordinated by varying the position, the diameter and the angle of the radial and axial bores. In addition, the wetting area in the radial bores can be increased by introducing steel wool.

Claims

Pat_fiπt-.;_n..pττ.πh Pat_fiπt -.; _ N..pττ.πh
1. Entlüftungsvorrichtung für ein Kurbelgehäuse einer Brennkraftmaschine mit einer Ausgleichswelle mit Massenausgleichsgewichten, welche im Zylinderkopf oberhalb der Gaswechselventile der Brennkraftmaschine angeordnet ist und welche wenigstens eine Öffnung zumindest für den Eintritt von Gas sowie einen innerhalb der Ausgleichswelle verlaufenden Gasführungsraum aufweist, der mit einem Ansaugsystem der Brennkraftmaschine verbunden ist, wobei ein außerrialb der Ausgleichswelle angeordneter Raum mit dem Kurbelgehäuse verbunden ist, d a d u r c h g e k e n n z e i c h n e t , d a ß die wenigstens eine Öffnung (12) in einem Massenausgleichsgewicht (3, 4) angeordnet ist und in eine axial verlaufende Zuführbohrung (13) mündet, die mit einer in dem Massenausgleichsgewicht (3, 4) angeordneten ölabführenden Radialbohrung (14) verbunden ist, welche in den Raum (5) außerhalb der Ausgleichswelle (2) und in den Gasführungsraum (9) der Ausgleichswelle (2) mündet.1.Ventilation device for a crankcase of an internal combustion engine with a balance shaft with mass balance weights, which is arranged in the cylinder head above the gas exchange valves of the internal combustion engine and which has at least one opening at least for the entry of gas and a gas routing space running inside the balance shaft, which has an intake system of the internal combustion engine is connected, wherein an outer radial space of the balance shaft is connected to the crankcase, characterized in that ß the at least one opening (12) is arranged in a mass balance weight (3, 4) and opens into an axially extending feed bore (13), which with an oil-discharging radial bore (14) arranged in the mass balance weight (3, 4) is connected, which opens into the space (5) outside the balance shaft (2) and into the gas guide space (9) of the balance shaft (2).
2. Entlüftungsvorrichtung für ein Kurbelgehäuse einer Brennkraftmaschine mit einer Ausgleichswelle mit Massenausgleichsgewichten, welche im Zylinderkopf oberhalb der Gaswechselventile der Brennkraftmaschine angeordnet ist und welche wenigstens eine Öffnung zumindest für den Eintritt von Gas sowie einen innerhalb der Ausgleichswelle verlaufenden Gasführungsraum aufweist, der mit einem Ansaugsystem der Brennkraftmaschine verbunden ist, wobei ein außerhalb der Ausgleichswelle angeordneter Raum mit dem Kurbelgehäuse verbunden ist, d a d u r c h g e k e n n z e i c h n e t , d a ß die wenigstens eine Öffnung (17) in der Ausgleichswelle (2) angeordnet ist und in den Gasführungsraum (18) mündet, der mit dem Ansaugssystem (11) der Brennkraftmaschine und mit in den Massenausgleichsgewichten (3, 4) angeordneten, δlabführen- den Radialbohrungen (19) verbunden ist, welche in den Raum (5) außerhalb der Ausgleichswelle (2) münden.2.Ventilation device for a crankcase of an internal combustion engine with a balance shaft with mass balance weights, which is arranged in the cylinder head above the gas exchange valves of the internal combustion engine and which has at least one opening at least for the entry of gas and a gas routing space running inside the balance shaft, which has an intake system of the internal combustion engine is connected, wherein a space arranged outside the balance shaft is connected to the crankcase, characterized in that that ß the at least one opening (17) is arranged in the balancer shaft (2) and opens into the gas routing space (18) which δlabndenden with the intake system (11) of the internal combustion engine and in the mass balancing weights (3, 4) Radial bores (19) are connected, which open into the space (5) outside the balance shaft (2).
3. Entlüftungsvorrichtung nach Anspruch 1 oder 2 , d a d u r c h g e k e n n z e i c h n e t , d a ß zwischen einem gasabführenden Ende (9b, 18c) des Gasführungsraumes (9, 18) und dem Ansaugsystem (11) der Brennkraftmaschine eine Kammer (10) angeordnet ist, die zur Umgebung hin luftdicht geschlossen ausgeführt ist.3. Ventilation device according to claim 1 or 2, characterized in that ß between a gas-discharging end (9b, 18c) of the gas guide space (9, 18) and the intake system (11) of the internal combustion engine, a chamber (10) is arranged, which is airtight to the environment is closed.
4. Entlüftungsvorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , d a ß in den Massenausgleichsgewichten (3, 4) jeweils zwei einander gegenüberliegende Öffnungen (12) vorgesehen sind.4. Ventilation device according to claim 1, d a d u r c h g e k e n n e e c h e d, d a ß in the mass balance weights (3, 4) two mutually opposite openings (12) are provided.
5. Entlüftungsvorrichtung nach Anspruch l, d a d u r c h g e k e n n z e i c h n e t , d a ß die ölabführenden Radialbohrungen (14) in dem Raum (5) außerhalb der Ausgleichswelle (2) zugewandten Endbereichen (15) einen geringeren Durchmesser aufweisen.5. The venting device according to claim 1, wherein the oil-discharging radial bores (14) in the space (5) outside the balancing shaft (2) have end regions (15) with a smaller diameter.
6. Entlüftungsvorrichtung nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t , d a ß der Gasführungsraum (18) innerhalb der Massenausgleichsgewichte (3, 4) Abscheideräume (18a, 18b) aufweist. 6. Venting device according to claim 2, d a d u r c h g e k e n n e e c h e d, that the gas guide space (18) within the mass balancing weights (3, 4) has separation spaces (18a, 18b).
EP98909439A 1997-02-19 1998-02-11 Ventilation device for a crankcase of an internal combustion engine Expired - Lifetime EP0964982B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19706383 1997-02-19
DE19706383A DE19706383C2 (en) 1997-02-19 1997-02-19 Ventilation device for a crankcase of an internal combustion engine
PCT/EP1998/000756 WO1998037316A1 (en) 1997-02-19 1998-02-11 Ventilation device for a crankcase of an internal combustion engine

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EP0964982A1 true EP0964982A1 (en) 1999-12-22
EP0964982B1 EP0964982B1 (en) 2003-04-09

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JP (1) JP2000509783A (en)
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EP0964982B1 (en) 2003-04-09
KR20000071109A (en) 2000-11-25
DE19706383C2 (en) 2000-05-18
US6279553B1 (en) 2001-08-28
JP2000509783A (en) 2000-08-02
DE19706383A1 (en) 1998-09-03
WO1998037316A1 (en) 1998-08-27

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