EP3683434B1 - Exhaust return valve for a combustion engine - Google Patents

Exhaust return valve for a combustion engine Download PDF

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Publication number
EP3683434B1
EP3683434B1 EP19217952.1A EP19217952A EP3683434B1 EP 3683434 B1 EP3683434 B1 EP 3683434B1 EP 19217952 A EP19217952 A EP 19217952A EP 3683434 B1 EP3683434 B1 EP 3683434B1
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Prior art keywords
valve
valve rod
exhaust gas
combustion engine
guide
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EP19217952.1A
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German (de)
French (fr)
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EP3683434A1 (en
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Norbert Simons
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Pierburg GmbH
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Pierburg GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/74—Protection from damage, e.g. shielding means

Definitions

  • the invention relates to an exhaust gas recirculation valve for an internal combustion engine, having a housing with an inlet and an outlet, a valve body that can be moved in translation, the movement of which can be used to regulate a flow cross section between the inlet and the outlet, a valve rod that is firmly connected to the valve body, an actuator via which the valve rod with the valve body can be placed on a valve seat or lifted from the valve seat surrounding the controllable flow cross section, a guide bushing which is arranged in the housing and in which the valve rod is mounted and sealing means for sealing a gap between the guide bushing and the valve rod that can be moved in the guide bush.
  • Exhaust gas recirculation valves are used to regulate an exhaust gas flow that is recirculated into the cylinders of the internal combustion engine, which is fed back into the combustion process in the cylinders, and to reduce nitrogen emissions.
  • valves are usually designed as lifting valves, in which a valve body attached to a valve rod can be lifted from a valve seat between an inlet and an outlet or lowered onto it via an actuator, with intermediate positions also being able to be approached exactly for precise control.
  • the free cross-section between the inlet and the outlet is regulated in order to return an optimal flow of exhaust gas.
  • electromotive actuators with downstream gears are used to actuate the valve rod coupled to the valve body.
  • the task is therefore to provide an exhaust gas recirculation valve for an internal combustion engine which, over a long service life, significantly reduces both the penetration of particles and exhaust gases in the direction of the actuator and in the direction of the sliding area between the guide bush and the valve rod, so that Damage in the guide area between the valve rod and the guide bush can be avoided and the necessary actuating forces remain low even after many hours of use.
  • wear and tear should be reduced. Nevertheless, this should be able to be produced as cost-effectively as possible with little production and assembly effort.
  • a sealing ring along which the valve rod is slidably movable, is arranged inside the guide bush in a sealing portion formed axially between the first guide portion and the second guide portion.
  • This sealing ring provides additional protection for the sliding surface between the valve rod and the guide bush, with the ingress of gases in the direction of the actuator being reliably prevented by this sealing ring, thereby reducing the thermal load on the actuator.
  • the sealing ring advantageously lies with its first axial end axially against the second guide section of the guide bush, which prevents sealing directly at the entrance to the gap between the second guide section and the valve rod, since the flow resistance is increased at this position.
  • the guide bushing has a constriction against which the sealing ring rests with its second axial end opposite the first axial end, whereby the axial position of the sealing ring in the guide bushing is fixed without having to use additional components.
  • the sealing ring is inserted into the recess with slight deformation and then the valve rod is inserted into the guide bush.
  • the guide bushing is arranged outside of the second guide section at a distance from the valve rod. In this way, the sliding surface of the guide bush is reduced to the areas in which the piston rings are used for guidance and the area that is arranged beyond the sealing ring. This prevents scoring due to friction between the guide bushing and the valve rod in the area that is pushed into the second guide section, so that damage in the second guide section is significantly reduced.
  • the guide bushing has a uniform internal diameter from its axial end pointing towards the valve body to the constriction.
  • the piston rings preferably have an inclined or stepped slit, which significantly reduces the ingress of contaminants through the slit compared to vertical slits.
  • the at least one piston ring is preferably arranged in a radial groove of the valve rod. This enables easy assembly of the piston ring with a high sealing effect at the same time, both along the valve rod and to the guide bush along which the piston rings slide.
  • exactly two piston rings are arranged at an axial distance from one another on the valve rod. These two piston rings arranged one behind the other significantly increase the sealing effect, as they act like a labyrinth seal.
  • exactly one sealing ring is arranged in the guide bush, since it has been found that this, in conjunction with the piston rings, ensures an adequate and very good seal with respect to the actuator.
  • the sealing ring is advantageously a radial shaft sealing ring, which also ensures a high sealing effect over a long service life for such a lifting valve.
  • An exhaust gas recirculation valve for an internal combustion engine is thus created in which simple and inexpensive means ensure very good sealing of the gap between the valve rod and the guide bush and wear is reduced in comparison to known designs, so that a long service life is achieved. This prevents solid or liquid contaminants from penetrating into the guide area between the valve rod and the guide bush, which would make the valve difficult to move and to increased wear, and prevents hot or contaminated gases from penetrating into the actuator, so that this protected from thermal overload or corrosion.
  • the figure shows a detail of a side view of an exhaust gas recirculation valve according to the invention in a sectional view.
  • the exhaust gas recirculation valve has a housing 10 with an inlet 12 and an outlet 14 for the exhaust gas, to which an actuator housing 16 is attached, in which an actuator 18 is arranged, which consists of an electric motor 20, shown only partially, and one driven by the electric motor 20 , also only partially recognizable Transmission 22 is, via which the movement of the electric motor 20 is transmitted to a valve rod 24 stocky.
  • the transmission 22 can have an eccentric, not shown, which interacts with a link, not shown, whereby the rotational movement of the electric motor 20 is transferred into a translatory movement of the valve rod 24, which is at least operatively connected to the link.
  • the connecting link and the eccentric protrude into a gear chamber 26 which is closed by a cover cap 28 which, like the actuator housing 16, is fastened to the housing 10.
  • a restoring spring 30 radially surrounding the valve rod 24 is also arranged in the gear chamber 26 and is supported on the housing 10 and pretensions the exhaust gas recirculation valve in the closing direction.
  • valve rod 24 is mounted in a guide bushing 32 which is fixed in a bore 34 in the housing 10 .
  • a valve body 36 is fastened to the end of the valve rod 24 opposite the actuator 18 and interacts with a valve seat 38 which is formed in the housing 10 between the inlet 12 and the outlet 14 .
  • the valve body 36 is lifted off the valve seat 38 via the valve rod 24 against the force of the return spring 30 or lowered onto it by the force of the return spring 30, and the free flow cross section between the inlet 12 and the outlet 14 is thus regulated.
  • the valve rod 24 is radially surrounded sealing means 42 are provided.
  • these consist of two piston rings 44 which lie axially one above the other but are arranged at an axial distance from one another, which are made, for example, of coated stainless steel and are each arranged in a circumferential radial groove 46 .
  • Each of these piston rings 44 has an oblique running slot, whereby the slope of the flow resistance and thus the sealing effect is increased.
  • the piston rings 44 run in a first guide section 50 of the guide bushing 32, which points towards the valve body 36 and is at the bottom in the figure, and rest against it on the outside, so that the valve rod 24 is guided in the guide bushing 32 in a sliding manner via the piston rings 44.
  • the two piston rings 44 are first bent open and placed in the radial grooves 46 and then pushed into the guide bushing 32 with the valve rod 24 .
  • a second guide section 52 of the guide bushing 32 is formed at the opposite second end remote from the valve body 36 .
  • the valve rod 24 slides directly on the inner circumference of the guide bushing 32.
  • a sealing section 54 of the guide bushing 32 which is arranged between the first guide section 50 and the second guide section 52 adjoins this second guide section 52 .
  • the guide bushing 32 has an enlarged diameter, in which a sealing ring 56 is arranged, which can be designed in particular as a radial shaft sealing ring.
  • the sealing ring 56 rests with its first axial end 58 against the end of the second guide section 52 and with its second axial end 60 pointing towards the valve body 36 against a constriction 62 of the guide bushing 32, which, however, is also at a distance from the valve rod 24.
  • the sealing ring 56 is installed by pushing it from the end of the guide bushing 32 pointing towards the valve body 36 into the guide bushing 32, which has a constant inner diameter from this axial end to the constriction, and then by pressing it together over the constriction 62 and into the through the Constriction 62 resulting radial groove is inserted, where it unfolds again.
  • valve rod 24 with the piston rings 44 can then simply be inserted into the guide bushing 32, since the guide bushing 32 itself is at a distance from the valve rod 24, except in the second guide section 52 to the valve rod 24, which is from the first guide portion.
  • the construction described has the consequence that a high degree of tightness against the exhaust gas and thus also against the soot and condensate that may be present is achieved and long-lasting ease of movement of the valve rod during the translational movement is ensured.
  • the guidance in the guide bush in the area close to the exhaust gas is established via the piston rings, which are insensitive to dirt and yet always have good sliding properties, and on the other hand, the direct guidance of the valve rod in the guide bush is limited to a short area, which is also protected from dirt by the sealing ring. In this way, sluggishness or even jamming of the exhaust gas recirculation valves is reliably prevented even at high temperatures.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Lift Valve (AREA)

Description

Die Erfindung betrifft ein Abgasrückführventil für eine Verbrennungskraftmaschine mit einem Gehäuse mit einem Einlass und einem Auslass, einem translatorisch bewegbaren Ventilkörper, durch dessen Bewegung ein Durchströmungsquerschnitt zwischen dem Einlass und dem Auslass regelbar ist, einer Ventilstange, die mit dem Ventilkörper fest verbunden ist, einem Aktor über den die Ventilstange mit dem Ventilkörper auf einen Ventilsitz absetzbar oder von dem Ventilsitz abhebbar ist, der den regelbaren Durchströmungsquerschnitt umgibt, einer Führungsbuchse, die im Gehäuse angeordnet ist und in der die Ventilstange gelagert ist und Dichtmitteln zur Abdichtung eines Spaltes zwischen der Führungsbuchse und der in der Führungsbuchse bewegbaren Ventilstange.The invention relates to an exhaust gas recirculation valve for an internal combustion engine, having a housing with an inlet and an outlet, a valve body that can be moved in translation, the movement of which can be used to regulate a flow cross section between the inlet and the outlet, a valve rod that is firmly connected to the valve body, an actuator via which the valve rod with the valve body can be placed on a valve seat or lifted from the valve seat surrounding the controllable flow cross section, a guide bushing which is arranged in the housing and in which the valve rod is mounted and sealing means for sealing a gap between the guide bushing and the valve rod that can be moved in the guide bush.

Abgasrückführventile dienen zur Regelung eines in die Zylinder des Verbrennungsmotors zurückgeführten Abgasstromes, der in den Zylindern erneut der Verbrennung zugeführt wird, und die Stickstoffemissionen zu reduzieren.Exhaust gas recirculation valves are used to regulate an exhaust gas flow that is recirculated into the cylinders of the internal combustion engine, which is fed back into the combustion process in the cylinders, and to reduce nitrogen emissions.

Diese Ventile werden üblicherweise als Hubventile ausgeführt, bei denen ein an einer Ventilstange befestigter Ventilkörper über einen Aktor von einem Ventilsitz zwischen einem Einlass und einem Auslass abhebbar ist oder auf diesen absenkbar ist, wobei zur genauen Regelung auch Zwischenpositionen exakt angefahren werden können. Abhängig von der vorhandenen Motorlast wird so der freie Querschnitt zwischen dem Einlass und dem Auslass geregelt, um einen optimalen Abgasstrom zurückzuführen. Für eine möglichst genaue Regelung werden zumeist elektromotorische Aktoren mit nachgeschalteten Getrieben zur Betätigung der mit dem Ventilkörper gekoppelten Ventilstange verwendet.These valves are usually designed as lifting valves, in which a valve body attached to a valve rod can be lifted from a valve seat between an inlet and an outlet or lowered onto it via an actuator, with intermediate positions also being able to be approached exactly for precise control. Depending on the existing engine load, the free cross-section between the inlet and the outlet is regulated in order to return an optimal flow of exhaust gas. For the most precise control possible, mostly electromotive actuators with downstream gears are used to actuate the valve rod coupled to the valve body.

Problematisch sind jedoch die korrosiven Gase sowie die im Abgasstrom enthaltenen Partikel, beispielsweise Rußpartikel im Abgasstrom eines Dieselmotors sowie die vorhandene thermische Belastung der Ventile und deren Aktoren. Diese setzen sich an der Ventilstange beziehungsweise zwischen der Ventilstange und der Führungsbuchse ab und führen zu einer Schwergängigkeit des Ventils, was bis zu einem Blockieren des Ventils führen kann. Zusätzlich gelangen heiße Abgasströme entlang der Ventilstange zum Aktor und können dort zu einer thermischen Überlastung führen.However, the corrosive gases and the particles contained in the exhaust gas flow, for example soot particles in the exhaust gas flow of a diesel engine, as well as the existing thermal load on the valves and their actuators, are problematic. These settle on the valve rod or between the valve rod and the guide bush and cause the valve to move sluggishly, which can even lead to the valve becoming blocked. In addition, hot exhaust gas flows along the valve rod to the actuator and can lead to thermal overload there.

Daher sind verschiedene Möglichkeiten zur Reduzierung der Ablagerungen und zur Abdichtung der Ventilstange bekannt geworden. So wird in der DE 10 2010 035 622 A1 ein Abgasrückführventil vorgeschlagen, bei dem an der zum Aktor weisenden Seite der Führungsbuchse ein Radialwellenlippendichtring angeordnet, über den das Eindringen eines Gasstroms oder von Partikeln in den Aktor vermieden werden soll. Dieser weist jedoch eine eingeschränkte thermische Belastbarkeit auf. Zusätzlich weist die Führungsbuchse einen zur Ventilstange gewandten Abschnitt verkleinerten Durchmessers auf, um Ablagerungen von der Ventilstange abzuschaben, bevor diese in den Spalt zwischen Ventilstange und Führungsabschnitt der Buchse gelangen. Die Führungsbuchse weist in bestimmten Abschnitten einen Spalt zur Ventilstange auf, um die mechanische Belastung des Dichtrings zu reduzieren.Therefore, various ways to reduce the deposits and to seal the valve rod have become known. So will in the DE 10 2010 035 622 A1 an exhaust gas recirculation valve is proposed, in which a radial shaft lip sealing ring is arranged on the side of the guide bush pointing towards the actuator, via which the ingress of a gas stream or particles into the actuator is to be avoided. However, this has a limited thermal resilience. In addition, the guide sleeve has a section of reduced diameter facing the valve rod in order to scrape deposits from the valve rod before they enter the gap between the valve rod and the guide section of the sleeve. The guide bush has a gap to the valve rod in certain sections in order to reduce the mechanical stress on the sealing ring.

Des Weiteren wird in der DE 10 2014 109 002 A1 ein Ventil für den Abgasbereich offenbart, dessen Ventilstange über zwei Lager geführt wird, die in einer Buchse im Gehäuse angeordnet sind.Furthermore, in the DE 10 2014 109 002 A1 discloses a valve for the exhaust gas area, the valve rod of which is guided via two bearings which are arranged in a bushing in the housing.

Zusätzlich offenbart die DE 10 2014 201 085 A1 eine Führungsbuchse für die Ventilstange eines Abgasrückführventils. Zwischen dem Aktor und der Buchse ist zur Abdichtung ein Wellendichtring auf der Ventilstange angeordnet, der gegen die Führungsbuchse anliegt.Additionally revealed the DE 10 2014 201 085 A1 a guide bush for the valve rod of an exhaust gas recirculation valve. between the actor and the For sealing purposes, a shaft sealing ring is arranged on the valve rod, which abuts against the guide bush.

Problematisch ist es jedoch, dass weiterhin Partikel in die Gleitpaarung zwischen der Ventilstange und der Führungsbuchse eindringen können, die die Führungsbuchse oder die Ventilstange schädigen, wodurch die Leichtgängigkeit der Ventilstange eingeschränkt wird. Des Weiteren kann ein Eindringen von Gas in Richtung des Aktors nicht ausgeschlossen werden, wodurch die thermische Belastung steigt, so dass häufig zusätzliche Kühlungen des Aktors notwendig werden.The problem, however, is that particles can continue to penetrate the sliding pairing between the valve rod and the guide bushing, damaging the guide bushing or the valve rod, which restricts the ease of movement of the valve rod. Furthermore, a penetration of gas in the direction of the actuator cannot be ruled out, as a result of which the thermal load increases, so that additional cooling of the actuator is often necessary.

Es stellt sich daher die Aufgabe, ein Abgasrückführventil für eine Verbrennungskraftmaschine bereit zu stellen, welches über eine lange Lebensdauer sowohl ein Eindringen von Partikeln als auch von Abgasen in Richtung des Aktors und in Richtung des Gleitbereiches zwischen der Führungsbuchse und der Ventilstange deutlich reduziert, so dass Schäden im Führungsbereich zwischen Ventilstange und Führungsbuchse vermieden werden und so die notwendigen Stellkräfte auch nach vielen Gebrauchsstunden gering bleiben. Gleichzeitig soll der Verschleiß reduziert werden. Dennoch soll dieses möglichst kostengünstig mit geringem Herstellungs- und Montageaufwand hergestellt werden können.The task is therefore to provide an exhaust gas recirculation valve for an internal combustion engine which, over a long service life, significantly reduces both the penetration of particles and exhaust gases in the direction of the actuator and in the direction of the sliding area between the guide bush and the valve rod, so that Damage in the guide area between the valve rod and the guide bush can be avoided and the necessary actuating forces remain low even after many hours of use. At the same time, wear and tear should be reduced. Nevertheless, this should be able to be produced as cost-effectively as possible with little production and assembly effort.

Diese Aufgabe wird durch ein Abgasrückführventil für eine Verbrennungskraftmaschine mit den Merkmalen des Hauptanspruchs 1 gelöst.This object is achieved by an exhaust gas recirculation valve for an internal combustion engine having the features of main claim 1.

Dadurch, dass auf der Ventilstange in einem zum Ventilkörper weisenden ersten Führungsabschnitt innerhalb der Führungsbuchse ein oder mehrere Kolbenringe angeordnet sind, über die die Ventilstange in der Führungsbuchse gleitend gelagert ist und in einem weiter vom Ventilkörper entfernten zweiten Führungsabschnitt die Ventilstange unmittelbar in der Führungsbuchse gleitend gelagert ist, kann ein Eindringen von Abgas oder Verunreinigungen entlang der Ventilstange auch bei hohen thermischen Belastungen sehr zuverlässig verhindert werden. Insbesondere befindet sich dabei der Gleitbereich zwischen der Führungsbuchse und der Ventilstange in einem durch die Kolbenringe abgeschirmten Bereich, in den ein Eindringen von Verunreinigungen zuverlässig vermieden wird. Des Weiteren wird die Gleitfähigkeit durch die Verwendung der Kolbenringe im Abgas zugewandten Bereich über eine lange Lebensdauer aufrecht erhalten, so dass geringe Stellkräfte benötigt werden. Des Weiteren ist der Reibungswiderstand im Vergleich zu bekannten Ausführungen reduziert, da die Paarung Kolbenring zu Führungsbuchse sehr gute Gleiteigenschaften aufweist.The fact that one or more piston rings are arranged on the valve rod in a first guide section facing the valve body inside the guide bush, via which the valve rod is slidably mounted in the guide bush and in a second guide section further away from the valve body the valve rod is slidably mounted directly in the guide bush is, an ingress of exhaust gas or Contamination along the valve rod can be reliably prevented even under high thermal loads. In particular, the sliding area between the guide bushing and the valve rod is in an area shielded by the piston rings, into which the ingress of contaminants is reliably prevented. Furthermore, the ability to slide is maintained over a long service life by using the piston rings in the area facing the exhaust gas, so that low actuating forces are required. Furthermore, the frictional resistance is reduced compared to known designs, since the pairing of the piston ring with the guide bush has very good sliding properties.

Vorzugsweise ist innerhalb der Führungsbuchse in einem Dichtabschnitt, der axial zwischen dem ersten Führungsabschnitt und dem zweiten Führungsabschnitt ausgebildet ist, ein Dichtring angeordnet, entlang dessen die Ventilstange gleitend bewegbar ist. Durch diesen Dichtring entsteht ein zusätzlicher Schutz der Gleitfläche zwischen der Ventilstange und der Führungsbuchse, wobei insbesondere das Eindringen von Gasen in Richtung des Aktors durch diesen Dichtring zuverlässig vermieden wird, wodurch die thermische Belastung des Aktors reduziert wird.Preferably, a sealing ring, along which the valve rod is slidably movable, is arranged inside the guide bush in a sealing portion formed axially between the first guide portion and the second guide portion. This sealing ring provides additional protection for the sliding surface between the valve rod and the guide bush, with the ingress of gases in the direction of the actuator being reliably prevented by this sealing ring, thereby reducing the thermal load on the actuator.

Dabei liegt der Dichtring vorteilhafterweise mit seinem ersten axialen Ende axial gegen den zweiten Führungsabschnitt der Führungsbuchse an, wodurch eine Abdichtung unmittelbar am Eintritt zum Spalt zwischen dem zweiten Führungsabschnitt und der Ventilstange verhindert wird, da der Strömungswiderstand an dieser Position erhöht wird.The sealing ring advantageously lies with its first axial end axially against the second guide section of the guide bush, which prevents sealing directly at the entrance to the gap between the second guide section and the valve rod, since the flow resistance is increased at this position.

In einer weiterführenden Ausbildung der Erfindung weist die Führungsbuchse eine Einschnürung aufweist, gegen die der Dichtring mit seinem zum ersten axialen Ende entgegengesetzten zweiten axialen Ende anliegt, wodurch die axiale Position des Dichtrings in der Führungsbuchse festgelegt wird, ohne zusätzliche Bauteile verwenden zu müssen. Zur Montage wird der Dichtring in die Ausnehmung unter leichter Verformung eingesteckt und anschließend die Ventilstange in die Führungsbuchse gesteckt.In a further development of the invention, the guide bushing has a constriction against which the sealing ring rests with its second axial end opposite the first axial end, whereby the axial position of the sealing ring in the guide bushing is fixed without having to use additional components. To the During assembly, the sealing ring is inserted into the recess with slight deformation and then the valve rod is inserted into the guide bush.

Vorteilhaft ist es auch, wenn die Führungsbuchse außerhalb des zweiten Führungsabschnitts beabstandet zur Ventilstange angeordnet ist. Auf diese Weise wird die Gleitfläche der Führungsbuchse reduziert auf die Bereiche, in denen die Kolbenringe zur Führung dienen und den Bereich, der jenseits des Dichtringes angeordnet ist. Damit wird eine Riefenbildung durch Reibung zwischen der Führungsbuchse und der Ventilstange in dem Bereich, der in den zweiten Führungsabschnitt verschoben wird, verhindert, so dass Schädigungen im zweiten Führungsabschnitt deutlich reduziert werden.It is also advantageous if the guide bushing is arranged outside of the second guide section at a distance from the valve rod. In this way, the sliding surface of the guide bush is reduced to the areas in which the piston rings are used for guidance and the area that is arranged beyond the sealing ring. This prevents scoring due to friction between the guide bushing and the valve rod in the area that is pushed into the second guide section, so that damage in the second guide section is significantly reduced.

Zur besonders einfachen Fertigung weist die Führungsbuchse von ihrem zum Ventilkörper weisenden axialen Ende bis zur Einschnürung einen einheitlichen Innendurchmesser auf.For particularly simple production, the guide bushing has a uniform internal diameter from its axial end pointing towards the valve body to the constriction.

Des Weiteren weisen die Kolbenringe vorzugsweise einen schrägen oder gestuften Schlitz auf, wodurch ein Eindringen von Schmutzstoffen durch den Schlitz im Vergleich zu senkrechten Schlitzen deutlich reduziert wird.Furthermore, the piston rings preferably have an inclined or stepped slit, which significantly reduces the ingress of contaminants through the slit compared to vertical slits.

Vorzugsweise ist der mindestens eine Kolbenring in einer Radialnut der Ventilstange angeordnet. Dies ermöglicht eine einfache Montage des Kolbenrings bei gleichzeitig hoher Dichtwirkung sowohl entlang der Ventilstange als auch zur Führungsbuchse entlang derer die Kolbenringe gleiten.The at least one piston ring is preferably arranged in a radial groove of the valve rod. This enables easy assembly of the piston ring with a high sealing effect at the same time, both along the valve rod and to the guide bush along which the piston rings slide.

In einer besonders bevorzugten Ausführungsform sind auf der Ventilstange genau zwei Kolbenringe axial beabstandet zueinander angeordnet. Durch diese zwei hintereinander angeordneten Kolbenringe wird die Dichtwirkung noch einmal deutlich erhöht, da sie wie eine Labyrinthdichtung wirken.In a particularly preferred embodiment, exactly two piston rings are arranged at an axial distance from one another on the valve rod. These two piston rings arranged one behind the other significantly increase the sealing effect, as they act like a labyrinth seal.

Vorzugsweise ist in der Führungsbuchse genau ein Dichtring angeordnet, da sich herausgestellt hat, dass dieser im Zusammenspiel mit den Kolbenringen eine ausreichende und sehr gute Abdichtung zum Aktor sicherstellt.Preferably, exactly one sealing ring is arranged in the guide bush, since it has been found that this, in conjunction with the piston rings, ensures an adequate and very good seal with respect to the actuator.

Der Dichtring ist dabei vorteilhafterweise ein Radialwellendichtring, der auch für ein derartiges Hubventil eine hohe Dichtwirkung über eine lange Lebensdauer sicherstellt.The sealing ring is advantageously a radial shaft sealing ring, which also ensures a high sealing effect over a long service life for such a lifting valve.

Es wird somit ein Abgasrückführventil für eine Verbrennungskraftmaschine geschaffen, bei dem mit einfachen und kostengünstigen Mitteln eine sehr gute Abdichtung des Spaltes zwischen der Ventilstange und der Führungsbuchse sichergestellt wird und der Verschleiß im Vergleich zu bekannten Ausführungen reduziert wird, so dass eine lange Lebensdauer erreicht wird. Dabei wird sowohl ein Eindringen von festen oder flüssigen Schmutzstoffen in den Führungsbereich zwischen der Ventilstange und der Führungsbuchse verhindert, was zu einer Schwergängigkeit des Ventils und zu erhöhtem Verschleiß führen würde als auch ein Eindringen von heißen oder kontaminierten Gasen in den Aktor verhindert, so dass dieser vor einer thermischen Überlastung oder Korrosion geschützt wird.An exhaust gas recirculation valve for an internal combustion engine is thus created in which simple and inexpensive means ensure very good sealing of the gap between the valve rod and the guide bush and wear is reduced in comparison to known designs, so that a long service life is achieved. This prevents solid or liquid contaminants from penetrating into the guide area between the valve rod and the guide bush, which would make the valve difficult to move and to increased wear, and prevents hot or contaminated gases from penetrating into the actuator, so that this protected from thermal overload or corrosion.

Ein Ausführungsbeispiel eines erfindungsgemäßen Abgasrückführventils ist in der Figur dargestellt und wird nachfolgend beschrieben.An embodiment of an exhaust gas recirculation valve according to the invention is shown in the figure and is described below.

Die Figur zeigt einen Ausschnitt einer Seitenansicht eines erfindungsgemäßen Abgasrückführventils in geschnittener Darstellung.The figure shows a detail of a side view of an exhaust gas recirculation valve according to the invention in a sectional view.

Das erfindungsgemäße Abgasrückführventil weist ein Gehäuse 10 mit einem Einlass 12 und einem Auslass 14 für das Abgas auf, an dem ein Aktorgehäuse 16 befestigt ist, in dem ein Aktor 18 angeordnet ist, der aus einem lediglich teilweise dargestellten Elektromotor 20 sowie einem vom Elektromotor 20 angetriebenen, ebenfalls nur teilweise erkennbaren Getriebe 22 besteht, über welches die Bewegung des Elektromotors 20 auf eine Ventilstange 24 untersetzt übertragen wird.The exhaust gas recirculation valve according to the invention has a housing 10 with an inlet 12 and an outlet 14 for the exhaust gas, to which an actuator housing 16 is attached, in which an actuator 18 is arranged, which consists of an electric motor 20, shown only partially, and one driven by the electric motor 20 , also only partially recognizable Transmission 22 is, via which the movement of the electric motor 20 is transmitted to a valve rod 24 stocky.

Hierzu kann das Getriebe 22 einen nicht dargestellten Exzenter aufweisen, der mit einer nicht dargestellten Kulisse zusammenwirkt, wodurch die rotatorische Bewegung des Elektromotors 20 in eine translatorische Bewegung der Ventilstange 24 übertragen wird, die mit der Kulisse zumindest wirkverbunden ist. Die Kulisse und der Exzenter ragen in einen Getrieberaum 26, der durch eine Abdeckkappe 28 geschlossen wird, welche ebenso wie das Aktorgehäuse 16 am Gehäuse 10 befestigt ist. Im Getrieberaum 26 ist zusätzlich eine die Ventilstange 24 radial umgebende Rückstellfeder 30 angeordnet, die sich auf dem Gehäuse 10 abstützt und das Abgasrückführventil in Schließrichtung vorspannt.For this purpose, the transmission 22 can have an eccentric, not shown, which interacts with a link, not shown, whereby the rotational movement of the electric motor 20 is transferred into a translatory movement of the valve rod 24, which is at least operatively connected to the link. The connecting link and the eccentric protrude into a gear chamber 26 which is closed by a cover cap 28 which, like the actuator housing 16, is fastened to the housing 10. A restoring spring 30 radially surrounding the valve rod 24 is also arranged in the gear chamber 26 and is supported on the housing 10 and pretensions the exhaust gas recirculation valve in the closing direction.

Die Ventilstange 24 ist in einer Führungsbuchse 32 gelagert, welche in einer Bohrung 34 des Gehäuses 10 befestigt ist. Am zum Aktor 18 entgegengesetzten Ende der Ventilstange 24 ist ein Ventilkörper 36 befestigt, der mit einem Ventilsitz 38 zusammenwirkt, der zwischen dem Einlass 12 und dem Auslass 14 im Gehäuse 10 ausgebildet ist. Durch Betätigung des Aktors 18 wird so der Ventilkörper 36 über die Ventilstange 24 entgegen der Kraft der Rückstellfeder 30 vom Ventilsitz 38 abgehoben oder durch die Kraft der Rückstellfeder 30 auf diesen abgesenkt und somit der freie Durchströmungsquerschnitt zwischen dem Einlass 12 und dem Auslass 14 geregelt.The valve rod 24 is mounted in a guide bushing 32 which is fixed in a bore 34 in the housing 10 . A valve body 36 is fastened to the end of the valve rod 24 opposite the actuator 18 and interacts with a valve seat 38 which is formed in the housing 10 between the inlet 12 and the outlet 14 . By actuating the actuator 18, the valve body 36 is lifted off the valve seat 38 via the valve rod 24 against the force of the return spring 30 or lowered onto it by the force of the return spring 30, and the free flow cross section between the inlet 12 and the outlet 14 is thus regulated.

Um einen Spalt 40 zwischen der Ventilstange 24 und der Führungsbuchse 32 abzudichten, sind die Ventilstange 24 radial umgebende Dichtmittel 42 vorgesehen. Diese bestehen im vorliegenden Ausführungsbeispiel aus zwei axial übereinander liegenden, jedoch axial beabstandet zueinander angeordneten, Kolbenringen 44, welche beispielsweise aus beschichtetem Edelstahl hergestellt sind und jeweils in einer umlaufenden Radialnut 46 angeordnet sind. Jeder dieser Kolbenringe 44 weist einen schräg verlaufenden Schlitz auf, wodurch durch die Schräge der Strömungswiderstand und somit die Dichtwirkung erhöht wird. Die Kolbenringe 44 laufen in einem ersten, zum Ventilkörper 36 weisenden, in der Figur unten liegenden Führungsabschnitt 50 der Führungsbuchse 32 und liegen außen gegen diese an, so dass die Ventilstange 24 über die Kolbenringe 44 in der Führungsbuchse 32 gleitend geführt wird.In order to seal a gap 40 between the valve rod 24 and the guide bushing 32, the valve rod 24 is radially surrounded sealing means 42 are provided. In the present exemplary embodiment, these consist of two piston rings 44 which lie axially one above the other but are arranged at an axial distance from one another, which are made, for example, of coated stainless steel and are each arranged in a circumferential radial groove 46 . Each of these piston rings 44 has an oblique running slot, whereby the slope of the flow resistance and thus the sealing effect is increased. The piston rings 44 run in a first guide section 50 of the guide bushing 32, which points towards the valve body 36 and is at the bottom in the figure, and rest against it on the outside, so that the valve rod 24 is guided in the guide bushing 32 in a sliding manner via the piston rings 44.

Zur Montage werden die beiden Kolbenringe 44 zunächst aufgebogen und in die Radialnuten 46 eingelegt und anschließend mit der Ventilstange 24 in die Führungsbuchse 32 eingeschoben.For assembly, the two piston rings 44 are first bent open and placed in the radial grooves 46 and then pushed into the guide bushing 32 with the valve rod 24 .

Ein zweiter Führungsabschnitt 52 der Führungsbuchse 32 ist am entgegengesetzten, vom Ventilkörper 36 entfernten, zweiten Ende ausgebildet. In diesem Führungsabschnitt 52 gleitet die Ventilstange 24 direkt am inneren Umfang der Führungsbuchse 32.A second guide section 52 of the guide bushing 32 is formed at the opposite second end remote from the valve body 36 . In this guide section 52, the valve rod 24 slides directly on the inner circumference of the guide bushing 32.

An diesen zweiten Führungsabschnitt 52 schließt sich ein Dichtabschnitt 54 der Führungsbuchse 32, der zwischen dem ersten Führungsabschnitt 50 und dem zweiten Führungsabschnitt 52 angeordnet ist. In diesem Dichtabschnitt 54 weist die Führungsbuchse 32 einen erweiterten Durchmesser auf, in dem ein Dichtring 56 angeordnet ist, der insbesondere als Radialwellendichtring ausgebildet werden kann. Der Dichtring 56 liegt mit seinem ersten axialen Ende 58 gegen das Ende des zweiten Führungsabschnitts 52 an und mit seinem zum Ventilkörper 36 weisenden, zweiten axialen Ende 60 gegen eine Einschnürung 62 der Führungsbuchse 32 an, die jedoch ebenfalls einen Abstand zur Ventilstange 24 aufweist.A sealing section 54 of the guide bushing 32 which is arranged between the first guide section 50 and the second guide section 52 adjoins this second guide section 52 . In this sealing section 54, the guide bushing 32 has an enlarged diameter, in which a sealing ring 56 is arranged, which can be designed in particular as a radial shaft sealing ring. The sealing ring 56 rests with its first axial end 58 against the end of the second guide section 52 and with its second axial end 60 pointing towards the valve body 36 against a constriction 62 of the guide bushing 32, which, however, is also at a distance from the valve rod 24.

Die Montage des Dichtrings 56 erfolgt, indem dieser vom zum Ventilkörper 36 weisenden Ende der Führungsbuchse 32 in die Führungsbuchse 32 eingeschoben wird, die von diesem axialen Ende bis zur Einschnürung einen konstanten Innendurchmesser aufweist, und anschließend durch Zusammendrücken über die Einschnürung 62 und in die durch die Einschnürung 62 entstehende Radialnut eingeschoben wird, wo sie sich wieder entfaltet.The sealing ring 56 is installed by pushing it from the end of the guide bushing 32 pointing towards the valve body 36 into the guide bushing 32, which has a constant inner diameter from this axial end to the constriction, and then by pressing it together over the constriction 62 and into the through the Constriction 62 resulting radial groove is inserted, where it unfolds again.

Nach der Montage der Kolbenringe 44 auf die Ventilstange 24 und des Dichtrings 56 in die Führungsbuchse 32 kann dann die Ventilstange 24 mit den Kolbenringen 44 einfach in die Führungsbuchse 32 eingesteckt werden, da die Führungsbuchse 32 selbst zur Ventilstange 24 außer im zweiten Führungsabschnitt 52 einen Abstand zur Ventilstange 24 aufweist, der vom ersten Führungsabschnitt.After installing the piston rings 44 on the valve rod 24 and the sealing ring 56 in the guide bushing 32, the valve rod 24 with the piston rings 44 can then simply be inserted into the guide bushing 32, since the guide bushing 32 itself is at a distance from the valve rod 24, except in the second guide section 52 to the valve rod 24, which is from the first guide portion.

Die beschriebene Konstruktion hat zur Folge, dass eine hohe Dichtigkeit gegen das Abgas und damit auch gegen das gegebenenfalls vorhandene Ruß und Kondensat erzielt wird und eine lang andauernde Leichtgängigkeit der Ventilstange bei der translatorischen Bewegung sichergestellt wird. Hierzu wird die Führung in der Führungsbuchse im Abgas nahen Bereich über die gegen Schmutz unempfindlichen und dennoch immer gute Gleiteigenschaften aufweisenden Kolbenringe hergestellt und andererseits die direkte Führung der Ventilstange in der Führungsbuchse auf einen kurzen Bereich begrenzt, der zusätzlich durch den Dichtring vor Schmutz geschützt ist. Auf diese Weise wird eine Schwergängigkeit oder gar ein Klemmen der Abgasrückführventile zuverlässig auch bei hohen Temperaturen verhindert.The construction described has the consequence that a high degree of tightness against the exhaust gas and thus also against the soot and condensate that may be present is achieved and long-lasting ease of movement of the valve rod during the translational movement is ensured. For this purpose, the guidance in the guide bush in the area close to the exhaust gas is established via the piston rings, which are insensitive to dirt and yet always have good sliding properties, and on the other hand, the direct guidance of the valve rod in the guide bush is limited to a short area, which is also protected from dirt by the sealing ring. In this way, sluggishness or even jamming of the exhaust gas recirculation valves is reliably prevented even at high temperatures.

Es sollte deutlich sein, dass verschiedene Modifikationen innerhalb des Schutzbereiches des Hauptanspruchs möglich sind. Insbesondere kann auch ein Kolbenring oder mehrere Kolbenringe genutzt werden. Auch können mehrere Dichtringe verbaut werden.It should be clear that various modifications are possible within the scope of the main claim. In particular, one piston ring or several piston rings can also be used. Several sealing rings can also be installed.

Claims (11)

  1. Exhaust gas recirculation valve for an internal combustion engine, comprising
    a housing (10) with an inlet (12) and an outlet (14),
    a translationally movable valve body (36) by the movement of which a flow cross section between the inlet (12) and the outlet (14) can be controlled,
    a valve rod (24) firmly connected to the valve body (36),
    an actuator (18) by which the valve rod (24) with the valve body (36) can be set on a valve seat (38) or be lifted off the valve seat (38) which surrounds the controllable flow cross section,
    a guide bushing (32) which is arranged in the housing (10) and in which the valve rod (24) is supported,
    sealing means (42) for sealing a gap between the guide bushing (32) and the valve rod (24) movable in the guide bushing (32), characterized in that
    one or more piston rings (44) are arranged on the valve rod (24) in a first guide section (50) facing the valve body (36) within the guide bushing (32), via which rings the valve rod (24) is slidably supported in the guide bushing (32) and the valve rod (24) is slidably supported directly in the guide bushing (32) in a second guide section (52) farther away from the valve body (36).
  2. Exhaust gas recirculation valve for an internal combustion engine according to claim 1, characterized in that a sealing ring (56) is arranged within the guide bushing (32) in a sealing section (54) formed axially between the first guide section (50) and the second guide section (52), the valve rod (24) being movable along said ring.
  3. Exhaust gas recirculation valve for an internal combustion engine according to claim 2, characterized in that the sealing ring (56) abuts axially on the second guide section (52) of the guide bushing (32) by its first axial end (58).
  4. Exhaust gas recirculation valve for an internal combustion engine according to claim 3, characterized in that the guide bushing (32) has a constriction (62) against which the sealing ring (56) abuts by its second axial end (60) opposite its first axial end (58).
  5. Exhaust gas recirculation valve for an internal combustion engine according to one of claims 2 to 4, characterized in that the guide bushing (32) is arranged outside the second guide section (52) at a distance from the valve rod (24).
  6. Exhaust gas recirculation valve for an internal combustion engine according to claim 4 or 5, characterized in that the guide bushing (32) has a uniform inner diameter from its axial end facing the valve body (36) to the constriction (62).
  7. Exhaust gas recirculation valve for an internal combustion engine according to one of the preceding claims, characterized in that the at least one piston ring (44) has an inclined or stepped slit.
  8. Exhaust gas recirculation valve for an internal combustion engine according to one of the preceding claims, characterized in that the at least one piston ring (44) is arranged in a radial groove (46) of the valve rod (24).
  9. Exhaust gas recirculation valve for an internal combustion engine according to one of the preceding claims, characterized in that exactly two piston rings (44) are arranged axially spaced from each other on the valve rod (24).
  10. Exhaust gas recirculation valve for an internal combustion engine according to one of the preceding claims, characterized in that exactly one sealing ring (56) is arranged in the guide bushing (32).
  11. Exhaust gas recirculation valve for an internal combustion engine according to one of the preceding claims, characterized in that the sealing ring (56) is a radial shaft sealing ring.
EP19217952.1A 2019-01-16 2019-12-19 Exhaust return valve for a combustion engine Active EP3683434B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019101051.9A DE102019101051A1 (en) 2019-01-16 2019-01-16 Exhaust gas recirculation valve for an internal combustion engine

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EP3683434A1 EP3683434A1 (en) 2020-07-22
EP3683434B1 true EP3683434B1 (en) 2022-01-26

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Publication number Priority date Publication date Assignee Title
CN113531127A (en) * 2021-05-20 2021-10-22 北京航天试验技术研究所 Ultralow-temperature pneumatic regulating valve

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6217001B1 (en) * 1999-06-29 2001-04-17 Delphi Technologies, Inc. Pressure balanced gas valve
US6439213B2 (en) * 2000-02-24 2002-08-27 Delphi Technologies, Inc. Shaft leakage arresting system for a gas management valve
DE102010035622B4 (en) 2010-08-26 2012-04-26 Pierburg Gmbh Exhaust gas recirculation valve for an internal combustion engine
DE102014108997A1 (en) * 2013-06-26 2015-01-15 BorgWarner Esslingen GmbH High temperature valve for an internal combustion engine
DE102014201085B4 (en) * 2014-01-22 2018-12-06 Bayerische Motoren Werke Aktiengesellschaft Exhaust gas recirculation valve
JP6435969B2 (en) * 2015-03-31 2018-12-12 株式会社デンソー EGR device
JP6447461B2 (en) * 2015-11-04 2019-01-09 株式会社デンソー Seal ring

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EP3683434A1 (en) 2020-07-22

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