WO2010048946A1 - Device for feeding a gaseous medium to a combustion chamber of an internal combustion engine - Google Patents

Device for feeding a gaseous medium to a combustion chamber of an internal combustion engine Download PDF

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Publication number
WO2010048946A1
WO2010048946A1 PCT/DE2009/001555 DE2009001555W WO2010048946A1 WO 2010048946 A1 WO2010048946 A1 WO 2010048946A1 DE 2009001555 W DE2009001555 W DE 2009001555W WO 2010048946 A1 WO2010048946 A1 WO 2010048946A1
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WO
WIPO (PCT)
Prior art keywords
internal combustion
combustion engine
valve
line
combustion chamber
Prior art date
Application number
PCT/DE2009/001555
Other languages
German (de)
French (fr)
Inventor
Siegfried Sumser
Stephan KRÄTSCHMER
Original Assignee
Tti Turbo Technik Innovation Gmbh
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Publication of WO2010048946A1 publication Critical patent/WO2010048946A1/en

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Classifications

    • 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
    • F01M13/02Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/06Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding lubricant vapours
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10Air intakes; Induction systems
    • F02M35/10209Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10216Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10Air intakes; Induction systems
    • F02M35/10209Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • 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
    • F01M13/0416Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
    • 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
    • F01M13/02Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • F01M2013/026Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure with pumps sucking air or blow-by gases from the crankcase
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Definitions

  • the invention relates to a device for feeding a gaseous medium into a combustion chamber of an internal combustion engine according to the preamble of patent claim 1.
  • Such a device serves to return a crankcase ventilation into the combustion chambers of an internal combustion engine and comprises a vent line opening into the air intake tract of the internal combustion engine, in which a pumping device for increasing a gas pressure in the venting line is arranged.
  • a pumping device for increasing a gas pressure in the venting line is arranged.
  • the pressure of the blow-by gases must now be increased first, since these essentially occur at pressures close to the ambient pressure.
  • the pumping device is preferably a piston pump.
  • Such a device has the disadvantage that such a piston pump requires a relatively large amount of space, which is not always available in modern engine rooms.
  • the present invention is therefore based on the object to develop a device for supplying a gaseous medium in a combustion chamber of an internal combustion engine according to the preamble of claim 1 so that a space-saving and low-contamination supply of gases in a combustion chamber of the internal combustion engine is made possible.
  • Such a device comprises a line which opens into a valve region of a combustion chamber of the internal combustion engine.
  • a pump means for increasing a gas pressure in the conduit is further arranged to make such supply possible even with supercharged engines.
  • the pumping device can be driven by an associated valve in the internal combustion engine.
  • miniaturized pumps are used, which are driven through the camshaft by means of an intake or exhaust valve of the internal combustion engine.
  • the line is designed here as a vent line for venting a crankcase of the internal combustion engine. This allows the return of blow-by gases in the combustion chamber of the internal combustion engine, so that they no longer need to be discharged into the environment in the crankcase ventilation. This advantageously reduces the emission values of the motor vehicle.
  • blow-by gases in the vicinity of an intake valve in particular of a combustion chamber of the internal combustion engine further advantageously reduces the formation of coking and other deposits in the intake tract.
  • the line may be in communication with an exhaust gas recirculation device and / or an intake tract of the internal combustion engine.
  • an exhaust gas recirculation device and / or an intake tract of the internal combustion engine.
  • This makes it possible, as an alternative or in addition to the return of blow-by gases, to introduce fresh intake air or recirculated exhaust gas into the vicinity of the intake valve of the combustion chamber in a targeted manner.
  • operating characteristics for example the homogeneity of the combustion in the combustion chamber of the internal combustion engine can be improved, which in turn lowers the emission values of the internal combustion engine and improves their efficiency.
  • a lifting height of the pumping device is 5% to 20% of the lifting height of the valve.
  • the pumping device thus additionally fulfills an advantageous function in that it acts as an additional gas spring for cushioning the valve.
  • the pumping device preferably comprises in each case an inlet valve and an outlet valve, which are automatically adjustable as a function of a differential pressure between the two sides of the inlet valve or outlet valve between an opening and a closing state.
  • a pumping device automatically sucks in gas until a desired pressure is reached. Only when this setpoint pressure is reached, the outlet valve of the pump device opens and allows the gas to flow into the inlet valve region or the combustion chamber.
  • the target pressure is preferably chosen so that it corresponds approximately to the prevailing in the inlet valve area, or in the combustion chamber pressure conditions. A valve control for the pumping device is thus not necessary, which makes the device easy and inexpensive to implement.
  • the pumping device is designed as a bellows pump.
  • bellows pumps are particularly easy to implement, for example as a surrounding the valve stem Ringbalgpumpe. They also have a particularly advantageous self-spring characteristic, so that the valve movement is additionally damped by the pump charge change.
  • the spring characteristic of the bellows pumps is matched with the spring rate of the valve springs in order to continue to optimally maintain the opening and closing of the valves according to the cam shape with the pumping element.
  • the pumping device is located with a first surface on a cylinder head of the internal combustion engine and with a second, the first surface opposite surface on a spring plate of the valve of the internal combustion engine.
  • the entire space below a cup of the valve can be used as a pump room.
  • the pumping device is located with the first surface on a cylinder head of the internal combustion engine and with a second, the first surface opposite surface of a cup of the valve of the internal combustion engine. Due to the larger harmful volume, the pressure level of this embodiment is slightly lower, but the amount of gas pumped is increased. It is conceivable that with an advanced form of the existing valve stem seal, the mode of action of the outlet valve of the pump is shown.
  • only one such device or a plurality of such devices may be provided in an internal combustion engine. While an arrangement of the device on an intake valve of the internal combustion engine is preferred, an alternative or additional arrangement of the device may be provided in an exhaust valve of the internal combustion engine.
  • FIG. 1 is a schematic representation of the valve portion of an internal combustion engine with an embodiment of a device according to the invention
  • FIG. 2 shows a detailed view of the cylinder head side valve region of an internal combustion engine with a pump device designed as a ring bellows pump.
  • Fig. 1 shows a detail of a cross-sectional view of an internal combustion engine with an embodiment of a device according to the invention, which here for venting the crankcase.
  • the resulting in the crankcase of the internal combustion engine 10 air, so-called blow-by gases, ie combustion air, which were pushed past the sealing rings of the piston is supplied via a vent line 12 initially surrounding the camshaft 14, relative to the environment airtight space 16 completed.
  • a pumping device 22 is arranged around an inlet valve 20 of the internal combustion engine 10.
  • This comprises a compression chamber 24 which communicates via an inlet valve 26 and a conduit 27 with the space 16 surrounding the camshaft 14.
  • the compression chamber 24 is connected to an end region 32 of an intake line 34 of the internal combustion engine 10.
  • the compression chamber 24 is closed by a movable diaphragm 36, on which the valve spring 38, the force exerted by the camshaft 14 on the valve 20 force is used for the compression of blow-by gases.
  • the inlet valve 26 and the outlet valve 28 are designed as self-adjusting, pressure-dependent valves.
  • the exhaust valve 28 opens only when the pressure in the compression chamber 24 of the pump device 22 to the pressure in the intake valve region 32, and in the combustion chamber 18 of the internal combustion engine equivalent. This ensures that the blow-by gases to be transported can be easily transported into the combustion chamber 18 without the need for active valve control.
  • the pumping device 20 comprises a ring bellows 40, which surrounds the valve stem 42 of the valve 20. With a first side 44 of the annular bellows 40 abuts against the valve bore 46 of the crankcase 48. With a second side 50, the annular bellows 40 communicates with the valve spring 38 by means of a force-transmitting plate 52. The mediated by the camshaft 14 lifting and lowering movement of the valve 20 is thus transmitted in this example via the valve spring 38 and the plate 52 to the annular bellows 40.
  • the annular bellows 40 is expanded, so that blow-by gases can flow in the direction of the arrow 52 through the inflow valve 26 into the compression space 24 of the annular bladder 40. If the valve is lowered, or if the valve opens, the compression of the valve spring 38 shifts the plate 52 downwards and compresses the annular bellows 40 while reducing the compression space 24, so that the gases collected in it are reached, provided a given minimum pressure has been reached in the direction of the arrow 54 through the outlet valve 28 of the pumping device 20 in the sequence via the channel 30 in the inlet valve portion 32 and combustion chamber 18 of the internal combustion engine can flow.
  • the annular bellows 40 additionally acts as a further gas spring which, together with the valve spring 38, further dampens the movement of the valve. It is advantageous to tune the spring characteristic of the bellows 40 in about the spring characteristic of the valve spring 38 in its rigidity.

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

Abstract

The invention relates to a device for feeding a gaseous medium to a combustion chamber (18) of an internal combustion engine (10), comprising a line (30) which leads to a valve section (32) of the combustion chamber (12) of the internal combustion engine (10), in which line a pump device (22) for increasing a gas pressure in the line (30) is arranged, said pump device (22) being drivable by an associated valve (20) of the internal combustion engine (10).

Description

Krätschmer/Sumser Krätschmer / Sumser
Vorrichtung zum Zuführen eines gasförmigen Mediums in eine Brennkammer einer BrennkraftmaschineDevice for feeding a gaseous medium into a combustion chamber of an internal combustion engine
Die Erfindung betrifft eine Vorrichtung zum Zuführen eines gasförmigen Mediums in eine Brennkammer einer Brennkraftmaschine nach dem Oberbegriff von Patentanspruch 1.The invention relates to a device for feeding a gaseous medium into a combustion chamber of an internal combustion engine according to the preamble of patent claim 1.
Eine solche Vorrichtung ist aus der DE 10 2004 053 946 A1 bekannt. Sie dient dem Rückführen einer Kurbelgehäuseentlüftung in die Brennräume einer Brennkraftmaschine und umfasst eine in den Luftansaugtrakt der Brennkraftmaschine mündende Entlüftungsleitung, in welcher eine Pumpeinrichtung zum Erhöhen eines Gasdrucks in der Entlüftungsleitung angeordnet ist. Mittels einer solchen Entlüftung des Kurbelgehäuses einer Brennkraftmaschine sollen in den Brennräumen der Brennkraftmaschine entstehende und an den Kolbenringen und Ventilschaftabdichtungen vorbei in das Kurbelgehäuse gelangende Verbrennungsgase, so genannte Blow-By-Gase, aus dem Kurbelgehäuse entfernt werden. Da diese Blow-By-Gase Abgasbestandteile wie Stickoxide und Schwefeloxide sowie Schmieröldämpfe enthalten, dürfen sie aufgrund von Abgasvorschriften nicht, oder nur unter bestimmten Voraussetzungen, ins Freie abgeführt werden. Die Rückführung der Blow-By- Gase in die Brennkammer der Brennkraftmaschine stellt dabei sicher, dass die Blow-By-Gase zusammen mit den regulären Abgasen der Brennkraftmaschine einer Abgasnachbehandlung unterzogen werden können.Such a device is known from DE 10 2004 053 946 A1. It serves to return a crankcase ventilation into the combustion chambers of an internal combustion engine and comprises a vent line opening into the air intake tract of the internal combustion engine, in which a pumping device for increasing a gas pressure in the venting line is arranged. By means of such venting of the crankcase of an internal combustion engine to be removed from the crankcase in the combustion chambers of the internal combustion engine resulting and past the piston rings and valve stem seals into the crankcase combustion gases, so-called blow-by gases. Since these blow-by gases contain exhaust components such as nitrogen oxides and sulfur oxides as well as lubricating oil vapors, they must not be discharged into the atmosphere, or only under certain conditions, due to exhaust gas regulations. The return of the blow-by gases in the combustion chamber of the internal combustion engine ensures that the blow-by gases can be subjected to an exhaust aftertreatment together with the regular exhaust gases of the internal combustion engine.
Bei einer einfachen Einleitung der Blow-By-Gase in die Ansaugleitung der Brennkraftmaschine besteht jedoch das Problem, dass durch die Ölverschmutzungen der Gase und durch die hohen Ladelufttemperaturen an den Wandungen des Ansaugtraktes Ablagerungen und Verkokungen entstehen. Davon betroffen sind in der Regel insbesondere Verdichter und Ladeluftkühler des Ansaugtraktes. Dadurch wird insbesondere der Wirkungsgrad von Abgasturboladern nachteilig erniedrigt. Die anfallende Gasmenge bei der Kurbelgehäuseentlüftung beträgt dabei in der Regel weniger als 1 ,5% des gesamten Motorluftdurchsatzes.In a simple introduction of the blow-by gases into the intake manifold of the internal combustion engine, however, there is the problem that arise through the oil spills of the gases and the high charge air temperatures on the walls of the intake deposits and coking. As a rule, this affects in particular compressors and intercoolers of the intake tract. As a result, in particular the efficiency of exhaust gas turbochargers is adversely reduced. The accumulating amount of gas in the crankcase ventilation is usually less than 1, 5% of the total engine air flow.
Um die Blow-By-Gase direkt in einen Hochdruckbereich des Ansaugtraktes einzubringen, so dass Verschmutzungen insbesondere eines Abgasturboladers vermieden werden, muss nun zunächst der Druck der Blow-By-Gase erhöht werden, da diese im Wesentlichen bei Drücken nahe dem Umgebungsdruck anfallen. Hierzu ist aus der DE 10 2004 053 946 A1 bekannt, in der Entlüftungsleitung eine Pumpeinrichtung vorzusehen, die Blow-By-Gase aus dem Kurbelgehäuse absaugt, deren Druck erhöht und sie in die Ansaugleitung der Brennkraftmaschine fördert. Die Pumpeinrichtung ist dabei bevorzugt eine Kolbenpumpe.In order to introduce the blow-by gases directly into a high-pressure region of the intake tract so that contamination, in particular of an exhaust-gas turbocharger, is avoided, the pressure of the blow-by gases must now be increased first, since these essentially occur at pressures close to the ambient pressure. For this purpose, it is known from DE 10 2004 053 946 A1 to provide in the vent line a pump device which sucks blow-by gases out of the crankcase, increases their pressure and conveys them into the intake line of the internal combustion engine. The pumping device is preferably a piston pump.
Eine derartige Vorrichtung ist mit dem Nachteil behaftet, dass eine solche Kolbenpumpe relativ viel Bauraum beansprucht, welcher in modernen Motorräumen nicht immer zur Verfügung steht.Such a device has the disadvantage that such a piston pump requires a relatively large amount of space, which is not always available in modern engine rooms.
Der vorliegenden Erfindung liegt somit die Aufgabe zugrunde, eine Vorrichtung zum Zuführen eines gasförmigen Mediums in eine Brennkammer einer Brennkraftmaschine nach dem Oberbegriff von Patentanspruch 1 so weiter zu entwickeln, dass eine Bauraum sparende und verschmutzungsarme Zuführung von Gasen in eine Brennkammer der Brennkraftmaschine ermöglicht wird.The present invention is therefore based on the object to develop a device for supplying a gaseous medium in a combustion chamber of an internal combustion engine according to the preamble of claim 1 so that a space-saving and low-contamination supply of gases in a combustion chamber of the internal combustion engine is made possible.
Diese Aufgabe wird durch eine Vorrichtung mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a device having the features of patent claim 1.
Eine solche Vorrichtung umfasst eine Leitung, welche in einen Ventilbereich einer Brennkammer der Brennkraftmaschine mündet. In der Leitung ist weiterhin eine Pumpeinrichtung zum Erhöhen eines Gasdrucks in der Leitung angeordnet, um eine derartige Zuführung auch bei aufgeladenen Motoren möglich zu machen. Erfindungsgemäß ist nun vorgesehen, dass die Pumpeinrichtung durch ein zugeordnetes Ventil in der Brennkraftmaschine antreibbar ist. In anderen Worten kommen miniaturisierte Pumpen zum Einsatz, welche unter Vermittelung eines Einlass- oder Auslassventils der Brennkraftmaschine durch die Nockenwelle getrieben werden. Damit wird vorteilhaft Bauraum eingespart, da keine externen Pumpen mehr nötig sind. Auch ein separater Antrieb der Pumpe ist nicht mehr nötig, da bereits zur Verfügung stehende Kräfte zum Antrieb der Pumpeinrichtung genutzt werden. Bevorzugt ist die Leitung hierbei als Entlüftungsleitung zum Entlüften eines Kurbelgehäuses der Brennkraftmaschine ausgeführt. Dies ermöglicht das Rückführen von Blow-By-Gasen in die Brennkammer der Brennkraftmaschine, so dass diese bei der Kurbelgehäuseentlüftung nicht mehr in die Umwelt abgegeben werden müssen. Dies reduziert vorteilhaft die Emissionswerte des Kraftwagens.Such a device comprises a line which opens into a valve region of a combustion chamber of the internal combustion engine. In the conduit, a pump means for increasing a gas pressure in the conduit is further arranged to make such supply possible even with supercharged engines. According to the invention it is now provided that the pumping device can be driven by an associated valve in the internal combustion engine. In other words, miniaturized pumps are used, which are driven through the camshaft by means of an intake or exhaust valve of the internal combustion engine. This space is advantageously saved, since no external pumps are needed. Even a separate drive of the pump is no more necessary, since already available forces are used to drive the pumping device. Preferably, the line is designed here as a vent line for venting a crankcase of the internal combustion engine. This allows the return of blow-by gases in the combustion chamber of the internal combustion engine, so that they no longer need to be discharged into the environment in the crankcase ventilation. This advantageously reduces the emission values of the motor vehicle.
Die Einleitung der Blow-By-Gase in den Nahbereich insbesondere eines Einlassventils einer Brennkammer der Brennkraftmaschine vermindert weiterhin vorteilhaft die Bildung von Verkokungen und anderen Ablagerungen im Ansaugtrakt.The introduction of the blow-by gases in the vicinity of an intake valve in particular of a combustion chamber of the internal combustion engine further advantageously reduces the formation of coking and other deposits in the intake tract.
Alternative oder auch zusätzlich kann die Leitung mit einer Abgasrückführeinrichtung und/oder einem Ansaugtrakt der Brennkraftmaschine in Verbindung stehen. Hierdurch wird es ermöglicht, alternativ oder zusätzlich zur Rückführung von Blow-By-Gasen auch frische Ansaugluft oder rückgeführtes Abgas in den Nahbereich des Einlassventils der Brennkammer gezielt einzubringen. Hierdurch können Betriebseigenschaften, beispielsweise die Homogenität der Verbrennung in der Brennkammer der Brennkraftmaschine verbessert werden, was wiederum die Emissionswerte der Brennkraftmaschine senkt und ihren Wirkungsgrad verbessert.Alternatively or additionally, the line may be in communication with an exhaust gas recirculation device and / or an intake tract of the internal combustion engine. This makes it possible, as an alternative or in addition to the return of blow-by gases, to introduce fresh intake air or recirculated exhaust gas into the vicinity of the intake valve of the combustion chamber in a targeted manner. As a result, operating characteristics, for example the homogeneity of the combustion in the combustion chamber of the internal combustion engine can be improved, which in turn lowers the emission values of the internal combustion engine and improves their efficiency.
In einer weiteren Ausführungsform der Erfindung beträgt eine Hubhöhe der Pumpeinrichtung 5% bis 20% der Hubhöhe des Ventils. Im Bereich der Hubhöhe der Pumpeinrichtung erfüllt die Pumpeinrichtung somit zusätzlich eine vorteilhafte Funktion, indem sie als zusätzliche Gasfeder zur Abfederung des Ventils fungiert.In a further embodiment of the invention, a lifting height of the pumping device is 5% to 20% of the lifting height of the valve. In the region of the lifting height of the pumping device, the pumping device thus additionally fulfills an advantageous function in that it acts as an additional gas spring for cushioning the valve.
Die Pumpeinrichtung umfasst bevorzugt jeweils ein Einlassventil und ein Auslassventil, welche in Abhängigkeit eines Differenzdruckes zwischen den beiden Seiten des Einlassventils beziehungsweise Auslassventils zwischen einem Öffnung- und einem Schließzustand selbsttätig verstellbar sind. In anderen Worten saugt eine derartige Pumpeinrichtung selbsttätig so lange Gas an, bis ein Solldruck erreicht ist. Erst beim Erreichen dieses Solldruckes öffnet das Auslassventil der Pumpeinrichtung und lässt das Gas in den Eintrittsventilbereich, bzw. die Brennkammer einströmen. Der Solldruck ist dabei bevorzugt so gewählt, dass er in etwa dem im Eintrittsventilbereich, bzw. den im Brennraum herrschenden Druckverhältnissen entspricht. Eine Ventilsteuerung für die Pumpeinrichtung ist somit nicht nötig, was die Vorrichtung einfach und kostengünstig realisierbar macht.The pumping device preferably comprises in each case an inlet valve and an outlet valve, which are automatically adjustable as a function of a differential pressure between the two sides of the inlet valve or outlet valve between an opening and a closing state. In other words, such a pumping device automatically sucks in gas until a desired pressure is reached. Only when this setpoint pressure is reached, the outlet valve of the pump device opens and allows the gas to flow into the inlet valve region or the combustion chamber. The target pressure is preferably chosen so that it corresponds approximately to the prevailing in the inlet valve area, or in the combustion chamber pressure conditions. A valve control for the pumping device is thus not necessary, which makes the device easy and inexpensive to implement.
In einer bevorzugten Ausführungsform ist die Pumpeinrichtung dabei als Balgpumpe ausgebildet. Solche Balgpumpen sind besonders einfach zu realisieren, beispielsweise als eine den Ventilschaft umgebende Ringbalgpumpe. Sie weisen zudem eine besonders vorteilhafte Eigenfedercharakteristik auf, so dass die Ventilbewegung durch den Pumpenladungswechsel zusätzlich gedämpft wird. Die Federcharakteristik der Balgpumpen wird mit der Federrate der Ventilfedern abgestimmt, um das Öffnen und Schliessen der Ventile entsprechend der Nockenform weiterhin mit dem Pumpelement optimal aufrecht zu erhalten.In a preferred embodiment, the pumping device is designed as a bellows pump. Such bellows pumps are particularly easy to implement, for example as a surrounding the valve stem Ringbalgpumpe. They also have a particularly advantageous self-spring characteristic, so that the valve movement is additionally damped by the pump charge change. The spring characteristic of the bellows pumps is matched with the spring rate of the valve springs in order to continue to optimally maintain the opening and closing of the valves according to the cam shape with the pumping element.
In einer weiteren Ausführungsform der Erfindung liegt die Pumpeinrichtung mit einer ersten Fläche an einem Zylinderkopf der Brennkraftmaschine und mit einer zweiten, der ersten Fläche gegenüber liegenden Fläche an einem Federteller des Ventils der Brennkraftmaschine an. In einer alternativen Ausführungsform kann auch der gesamte Raum unterhalb einer Tasse des Ventils als Pumpenraum genutzt werden. Hierbei liegt die Pumpeinrichtung mit der ersten Fläche an einem Zylinderkopf der Brennkraftmaschine und mit einer zweiten, der ersten Fläche gegenüber liegenden Fläche an einer Tasse des Ventils der Brennkraftmaschine an. Aufgrund des größeren Schadvolumens ist das Druckniveau dieser Ausführungsform etwas niedriger, die gepumpte Gasmenge ist jedoch erhöht. Denkbar ist, dass mit einer weiterentwickelten Form der bestehenden Ventilschaftabdichtung die Wirkweise des Auslassventiles der Pumpe dargestellt wird.In a further embodiment of the invention, the pumping device is located with a first surface on a cylinder head of the internal combustion engine and with a second, the first surface opposite surface on a spring plate of the valve of the internal combustion engine. In an alternative embodiment, the entire space below a cup of the valve can be used as a pump room. In this case, the pumping device is located with the first surface on a cylinder head of the internal combustion engine and with a second, the first surface opposite surface of a cup of the valve of the internal combustion engine. Due to the larger harmful volume, the pressure level of this embodiment is slightly lower, but the amount of gas pumped is increased. It is conceivable that with an advanced form of the existing valve stem seal, the mode of action of the outlet valve of the pump is shown.
Je nach zu fördernden Gasmengen kann in einer Brennkraftmaschine lediglich eine einzelne derartige Vorrichtung oder aber auch eine Mehrzahl von solchen Vorrichtungen vorgesehen sein. Während eine Anordnung der Vorrichtung an einem Einlassventil der Brennkraftmaschine bevorzugt wird, kann auch eine alternative oder zusätzliche Anordnung der Vorrichtung in einem Auslassventil der Brennkraftmaschine vorgesehen sein.Depending on the quantities of gas to be delivered, only one such device or a plurality of such devices may be provided in an internal combustion engine. While an arrangement of the device on an intake valve of the internal combustion engine is preferred, an alternative or additional arrangement of the device may be provided in an exhaust valve of the internal combustion engine.
Im Folgenden soll anhand der Zeichnung die Erfindung und ihre Ausführungsformen näher erläutert werden. Hierbei zeigen: Fig. 1 eine schematische Darstellung des Ventilbereichs einer Brennkraftmaschine mit einem Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung undIn the following, the invention and its embodiments will be explained in more detail with reference to the drawing. Hereby show: Fig. 1 is a schematic representation of the valve portion of an internal combustion engine with an embodiment of a device according to the invention and
Fig. 2 eine Detailansicht des zylinderkopfseitigen Ventilbereichs einer Brennkraftmaschine mit einer als Ringbalgpumpe ausgeführten Pumpeinrichtung.2 shows a detailed view of the cylinder head side valve region of an internal combustion engine with a pump device designed as a ring bellows pump.
Fig. 1 zeigt einen Ausschnitt einer Querschnittsdarstellung einer Brennkraftmaschine mit einem Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung, welche hier zum Entlüften des Kurbelgehäuses. Die im Kurbelgehäuse der Brennkraftmaschine 10 anfallende Luft, so genannte Blow-By- Gase, also Verbrennungsluft, welche an den Dichtungsringen der Kolben vorbeigedrückt wurden, wird über eine Entlüftungsleitung 12 zunächst einem die Nockenwelle 14 umgebenden, gegenüber der Umgebung luftdicht abgeschlossenen Raum 16 zugeführt.Fig. 1 shows a detail of a cross-sectional view of an internal combustion engine with an embodiment of a device according to the invention, which here for venting the crankcase. The resulting in the crankcase of the internal combustion engine 10 air, so-called blow-by gases, ie combustion air, which were pushed past the sealing rings of the piston is supplied via a vent line 12 initially surrounding the camshaft 14, relative to the environment airtight space 16 completed.
Da der Druck der Blow-By-Gase im Raum 16 und in der Leitung 12 wesentlich geringer ist, als der Druck der Ladeluft beziehungsweise des Gemisches im Brennraum 18 der Brennkraftmaschine 10, müssen die Blow-By-Gase vor der Einleitung in den Brennraum 18 zunächst verdichtet werden. Hierzu ist um ein Einlassventil 20 der Brennkraftmaschine 10 eine Pumpeinrichtung 22 angeordnet. Diese umfasst eine Verdichtungskammer 24, welche über ein Einlassventil 26 und eine Leitung 27 mit dem die Nockenwelle 14 umgebenden Raum 16 in Verbindung steht. Über ein Auslassventil 28 und eine weitere Leitung 30 ist der Verdichtungsraum 24 mit einem Endbereich 32 einer Ansaugleitung 34 der Brennkraftmaschine 10 verbunden. Der Verdichtungsraum 24 ist durch eine bewegliche Membran 36 abgeschlossen, auf die über die Ventilfeder 38 die von der Nockenwelle 14 auf das Ventil 20 ausgeübte Kraft zum Verdichten von Blow- By-Gasen genutzt wird.Since the pressure of the blow-by gases in the space 16 and in the conduit 12 is substantially lower than the pressure of the charge air or of the mixture in the combustion chamber 18 of the internal combustion engine 10, the blow-by gases before the introduction into the combustion chamber 18th be compressed first. For this purpose, a pumping device 22 is arranged around an inlet valve 20 of the internal combustion engine 10. This comprises a compression chamber 24 which communicates via an inlet valve 26 and a conduit 27 with the space 16 surrounding the camshaft 14. By way of an outlet valve 28 and a further line 30, the compression chamber 24 is connected to an end region 32 of an intake line 34 of the internal combustion engine 10. The compression chamber 24 is closed by a movable diaphragm 36, on which the valve spring 38, the force exerted by the camshaft 14 on the valve 20 force is used for the compression of blow-by gases.
Das Einlassventil 26 und das Auslassventil 28 sind als selbststellende, druckabhängige Ventile ausgebildet. Das Auslassventil 28 öffnet sich dabei nur, sobald der Druck im Kompressionsraum 24 der Pumpeinrichtung 22 dem Druck im Einlassventilbereich 32, bzw. dem im Brennraum 18 der Brennkraftmaschine entspricht. Dadurch wird gewährleistet, dass die zu befördernden Blow-By-Gase problemlos in den Brennraum 18 befördert werden können, ohne dass eine aktive Ventilsteuerung nötig wird.The inlet valve 26 and the outlet valve 28 are designed as self-adjusting, pressure-dependent valves. The exhaust valve 28 opens only when the pressure in the compression chamber 24 of the pump device 22 to the pressure in the intake valve region 32, and in the combustion chamber 18 of the internal combustion engine equivalent. This ensures that the blow-by gases to be transported can be easily transported into the combustion chamber 18 without the need for active valve control.
Eine Detailansicht der Pumpeinrichtung 20 ist in Fig. 2 gezeigt. Die Pumpeinrichtung 20 umfasst einen Ringbalg 40, welcher den Ventilschaft 42 des Ventils 20 umgibt. Mit einer ersten Seite 44 liegt der Ringbalg 40 an der Ventilbohrung 46 des Kurbelgehäuses 48 an. Mit einer zweiten Seite 50 steht der Ringbalg 40 unter Vermittelung einer Kraft übertragenden Platte 52 mit der Ventilfeder 38 in Verbindung. Die von der Nockenwelle 14 vermittelte Hub- und Senkbewegung des Ventils 20 wird also in diesem Beispiel über die Ventilfeder 38 und die Platte 52 auf den Ringbalg 40 übertragen. Bei einer Hubbewegung des Ventils 20 wird der Ringbalg 40 entspannt, so dass Blow-By-Gase in Richtung des Pfeils 52 durch das Einströmventil 26 in den Kompressionsraum 24 des Ringbalges 40 einströmen können. Senkt sich, bzw. öffnet sich das Ventil, so wird durch die Kompression der Ventilfeder 38 die Platte 52 nach unten verschoben und der Ringbalg 40 unter Verkleinerung des Kompressionsraums 24 komprimiert, so dass die in ihm gesammelten Gase, so fern ein gegebener Mindestdruck erreicht ist in Richtung des Pfeils 54 durch das Auslassventil 28 der Pumpeinrichtung 20 in der Folge über den Kanal 30 in den Einlassventilbereich 32 und Brennraum 18 der Brennkraftmaschine strömen können.A detailed view of the pumping device 20 is shown in FIG. The pumping device 20 comprises a ring bellows 40, which surrounds the valve stem 42 of the valve 20. With a first side 44 of the annular bellows 40 abuts against the valve bore 46 of the crankcase 48. With a second side 50, the annular bellows 40 communicates with the valve spring 38 by means of a force-transmitting plate 52. The mediated by the camshaft 14 lifting and lowering movement of the valve 20 is thus transmitted in this example via the valve spring 38 and the plate 52 to the annular bellows 40. During a stroke movement of the valve 20, the annular bellows 40 is expanded, so that blow-by gases can flow in the direction of the arrow 52 through the inflow valve 26 into the compression space 24 of the annular bladder 40. If the valve is lowered, or if the valve opens, the compression of the valve spring 38 shifts the plate 52 downwards and compresses the annular bellows 40 while reducing the compression space 24, so that the gases collected in it are reached, provided a given minimum pressure has been reached in the direction of the arrow 54 through the outlet valve 28 of the pumping device 20 in the sequence via the channel 30 in the inlet valve portion 32 and combustion chamber 18 of the internal combustion engine can flow.
Der Ringbalg 40 wirkt dabei zusätzlich als weitere Gasfeder, welche zusammen mit der Ventilfeder 38 die Bewegung des Ventils weiter dämpft. Es ist dabei vorteilhaft, die Federkennlinie des Ringbalges 40 in etwa auf die Federkennlinie der Ventilfeder 38 in ihrer Steifigkeit abzustimmen.The annular bellows 40 additionally acts as a further gas spring which, together with the valve spring 38, further dampens the movement of the valve. It is advantageous to tune the spring characteristic of the bellows 40 in about the spring characteristic of the valve spring 38 in its rigidity.
Neben der Verwendung zur Rückführung von Blow-By-Gasen ist darüber hinaus eine Verwendung derartiger Pumpeinrichtungen 20 zum Transportieren von zusätzlicher Luft oder rückzuführendem Abgas in den Brennraum 18 der Brennkraftmaschine 10 denkbar. BezugszeichenlisteIn addition to the use for the return of blow-by gases, a use of such pumping means 20 for transporting additional air or recirculating exhaust gas into the combustion chamber 18 of the internal combustion engine 10 is also conceivable. LIST OF REFERENCE NUMBERS
10 Brennkraftmaschine10 internal combustion engine
12 Entlüftungsleitung12 vent line
14 Nockenwelle14 camshaft
16 Raum16 room
18 Brennraum18 combustion chamber
20 Einlassventil20 inlet valve
22 Pumpeinrichtung22 pumping device
24 Verdichtungsraum24 compaction space
26 Einlassventil26 inlet valve
27 Leitung27 line
28 Auslassventil28 exhaust valve
30 Leitung30 line
32 Endbereich32 end area
34 Ansaugleitung34 suction line
36 Membran36 membrane
38 Ventilfeder38 valve spring
40 Ringbalg40 ring bellows
44 Seite44 page
46 Ventilbohrung46 valve bore
48 Kugelgehäuse48 ball housing
50 Seite50 page
52 Platte52 plate
54 Pfeil 54 arrow

Claims

Patentansprüche claims
1. Vorrichtung zum Zuführen eines gasförmigen Mediums in eine Brennkammer (18) einer Brennkraftmaschine (10), mit einer in einen Ventilbereich (32) der Brennkammer (18) der Brennkraftmaschine (10) mündenden Leitung (30), in der eine Pumpeinrichtung (22) zum Erhöhen eines Gasdrucks in der Leitung (30) angeordnet ist, dadurch gekennzeichnet, dass die Pumpeinrichtung (22) durch ein zugeordnetes Ventil (20) der .1. A device for supplying a gaseous medium into a combustion chamber (18) of an internal combustion engine (10), with a in a valve region (32) of the combustion chamber (18) of the internal combustion engine (10) opening line (30) in which a pumping device (22 ) is arranged to increase a gas pressure in the conduit (30), characterized in that the pumping means (22) by an associated valve (20) of the.
Brennkraftmaschine (10) antreibbar ist.Internal combustion engine (10) is drivable.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Leitung (30) als Entlüftungsleitung zum Entlüften eines Kurbelgehäuses der Brennkraftmaschine (10) ausgebildet ist.2. Apparatus according to claim 1, characterized in that the line (30) is designed as a vent line for venting a crankcase of the internal combustion engine (10).
3. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Leitung (30) mit einer Abgasrückführungsleitung und/oder einem Ansaugtrakt der Brennkraftmaschine (10) in Verbindung steht.3. Device according to claim 1, characterized in that the line (30) with an exhaust gas recirculation line and / or an intake tract of the internal combustion engine (10) is in communication.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass eine Hubhöhe der Pumpeinrichtung (22) 5% bis 20% der Hubhöhe des Ventils (20) beträgt. 4. Device according to one of claims 1 to 3, characterized in that a lifting height of the pumping device (22) is 5% to 20% of the lifting height of the valve (20).
5. Vorrichtung nach Anspruch 1 bis 4, dadurch gekennzeichnet, dass die Pumpeinrichtung (22) jeweils ein Einlassventil (26) und ein Auslassventil (28) umfasst, welche in Abhängigkeit eines Differenzdruckes zwischen den beiden Seiten des Einlassventils (26) bzw. Auslassventils (28) zwischen einem Öffnungs- und einem Schließzustand selbsttätig verstellbar sind.5. Apparatus according to claim 1 to 4, characterized in that the pumping means (22) each comprise an inlet valve (26) and an outlet valve (28), which in dependence of a differential pressure between the two sides of the inlet valve (26) and exhaust valve ( 28) are automatically adjustable between an opening and a closing state.
6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Pumpeinrichtung (22) als Balgpumpe ausgebildet ist.6. Device according to one of the preceding claims, characterized in that the pumping device (22) is designed as a bellows pump.
7. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Pumpeinrichtung (22) mit einer ersten Fläche (44) an einen Zylinderkopf (48) der Brennkraftmaschine (10) und mit einer zweiten, der ersten Fläche gegenüberliegenden Fläche (50) an einen Federteller (52) des Ventils (20) der Brennkraftmaschine (10) in Anlage ist.7. Device according to one of the preceding claims, characterized in that the pumping means (22) having a first surface (44) on a cylinder head (48) of the internal combustion engine (10) and with a second surface opposite the first surface (50) a spring plate (52) of the valve (20) of the internal combustion engine (10) is in abutment.
8. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Pumpeinrichtung (22) mit einer ersten Fläche (44) an einen Zylinderkopf (48) der Brennkraftmaschine (10) und mit einer zweiten, der ersten Fläche (44) gegenüberliegenden Fläche (50) an einer Tasse des Ventils (20) der Brennkraftmaschine (10) in Anlage ist. 8. Device according to one of the preceding claims, characterized in that the pumping device (22) with a first surface (44) to a cylinder head (48) of the internal combustion engine (10) and with a second, the first surface (44) opposite surface ( 50) on a cup of the valve (20) of the internal combustion engine (10) is in abutment.
PCT/DE2009/001555 2008-10-28 2009-10-28 Device for feeding a gaseous medium to a combustion chamber of an internal combustion engine WO2010048946A1 (en)

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DE102008053588.5 2008-10-28
DE102008053588A DE102008053588A1 (en) 2008-10-28 2008-10-28 Gaseous medium supplying device for internal-combustion engine of motor vehicle, has ventilation pipe flowing into valve region of combustion chamber, and pump device i.e. bellows pump, drivable by assigned inlet valve of engine

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DE102009048713A1 (en) 2009-10-08 2011-04-14 Daimler Ag Ventilation unit for internal combustion engine for motor vehicle, has compressor of exhaust turbocharger, where compressor is arranged in intake section and has compressor wheel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1296873B (en) * 1962-07-27 1969-06-04 Walker Mfg Co Fuel supply device for an internal combustion engine
GB1156112A (en) * 1966-01-24 1969-06-25 Ford Motor Co Internal Combustion Engines.
JPS5973515U (en) * 1982-11-08 1984-05-18 ダイハツ工業株式会社 Blow-by gas reduction device for internal combustion engine
DE102004053946A1 (en) 2004-11-09 2006-05-11 Daimlerchrysler Ag Device for venting a crankcase of a supercharged internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1296873B (en) * 1962-07-27 1969-06-04 Walker Mfg Co Fuel supply device for an internal combustion engine
GB1156112A (en) * 1966-01-24 1969-06-25 Ford Motor Co Internal Combustion Engines.
JPS5973515U (en) * 1982-11-08 1984-05-18 ダイハツ工業株式会社 Blow-by gas reduction device for internal combustion engine
DE102004053946A1 (en) 2004-11-09 2006-05-11 Daimlerchrysler Ag Device for venting a crankcase of a supercharged internal combustion engine

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