EP3095997A1 - Hot gas regulating valve - Google Patents

Hot gas regulating valve Download PDF

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Publication number
EP3095997A1
EP3095997A1 EP16165779.6A EP16165779A EP3095997A1 EP 3095997 A1 EP3095997 A1 EP 3095997A1 EP 16165779 A EP16165779 A EP 16165779A EP 3095997 A1 EP3095997 A1 EP 3095997A1
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EP
European Patent Office
Prior art keywords
valve
hot gas
control valve
gas control
valve rod
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Granted
Application number
EP16165779.6A
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German (de)
French (fr)
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EP3095997B1 (en
Inventor
Peter Foessl
Bernhard Ramsebner
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP3095997A1 publication Critical patent/EP3095997A1/en
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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
    • F02M26/74—Protection from damage, e.g. shielding means
    • 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F02M26/54—Rotary actuators, e.g. step motors
    • 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
    • F02M26/72—Housings
    • F02M26/73—Housings with means for heating or cooling the EGR valve

Definitions

  • the invention relates to a hot gas control valve, in particular an exhaust gas control valve of a vehicle.
  • Such a hot gas control valve is e.g. used as an exhaust gas recirculation valve in an exhaust gas recirculation system of an internal combustion engine.
  • environmentally harmful nitrogen oxides are formed at high combustion temperatures, the formation of which can be reduced by branching off a portion of the exhaust gas from the exhaust pipe via an exhaust gas recirculation valve and admixing the fresh air supplied to the engine so as to lower the oxygen concentration in the charge air. This results in a combustion process at lower temperatures, resulting in less nitrogen oxides. An even higher efficiency in nitrogen oxide reduction is obtained when the recirculated exhaust gas is cooled.
  • Exhaust gas recirculation is a crucial measure for reducing nitrogen oxide emissions, especially in diesel engines, since the use of exhaust aftertreatment systems alone is not sufficient to comply with environmental legislation.
  • Exhaust gas recirculation valves are usually mounted close to the exhaust manifold and consequently are operated in the hot exhaust gas flow at temperatures of up to 850 ° C.
  • contaminations in the exhaust gas such as soot particles, engine oil residues or diesel components place increased demands on the valve for consistent performance over the entire vehicle life, as these combustion residues are deposited over time on the gas-carrying components of the valve.
  • a hot gas control valve in particular exhaust control valve is provided with a housing and a valve rod arranged on a shut-off body, wherein the valve rod is mounted on the housing side and performs a rotational movement upon actuation of the shut-off and wherein in the region of the housing at least one of the valve rod facing, near the Surface of the valve rod endende scraping edge is present for scraping itself on the in the extended state of the valve rod exposed to the hot gas portion of the valve rod deposits.
  • a bearing of the valve stem e.g. may be formed by a passage in the housing, is protected from excessive condensate and solids entry. This ensures the consistent function of the valve over the entire vehicle life.
  • At least one housing-side valve bearing is provided, which is designed in particular as a plain bearing bush. This is e.g. inserted into a bore in the valve body.
  • a low-friction material pairing is used for valve-bearing and valve rod, such as a bronze alloy for the valve bearing in combination with a steel valve stem.
  • a production-technically simple solution results from the fact that preferably the at least one scraping edge is arranged at the end of the valve bearing facing the shut-off body.
  • the scraping edge can also be provided directly on the housing or placed on the housing in a region facing the shut-off body.
  • the at least one scraping edge is arranged in the region of a recess in the valve bearing.
  • the recess can then absorb the scraped off substances.
  • the at least one scraping edge is formed by an edge of the recess, d. H. the scraping edge is not opposite to an inner wall of the valve bearing.
  • a structurally simple embodiment results when the recess is milled into the valve bearing.
  • a Stirnwalzen- or end mill or a disc or sickle cutters can be used.
  • the valve bearing has a bushing section facing the shut-off body, which has at least one radially continuous slot whose radially inner-side edge forms the scraping edge.
  • the slot which can be seen in the radial direction as an angular U, T or as V, additionally forms a recess in the valve bearing, which can absorb the scraped substances.
  • valve bearing is surrounded by the shut-off body radially from a housing-side heat shield.
  • a housing-side heat shield This is preferably made of stainless steel and also serves as a coarse dirt cap.
  • the heat shield may be an integrally formed extension of the housing.
  • a drive unit is provided with an output shaft, wherein the valve rod forms a direct extension of the output shaft. In this way, a particularly compact design is achieved.
  • valve rod may have a threaded spindle, which at least partially converts a rotational movement of the valve rod into a linear movement of the shut-off body.
  • a valve is for example as High pressure exhaust gas recirculation valve, VNT (Variable Nozzle Turbocharger) actuator or diverter valve application.
  • the hot gas control valve may also be designed such that the shut-off body is rotationally actuated, for example in the case of a swirl flap, throttle flap or a low-pressure exhaust gas recirculation valve.
  • valve bearing on a portion in which a valve rod facing cylindrical recess is provided, which is designed in particular as a relief.
  • This recess serves to increase the bearing gap between the valve bearing and the valve rod, which in a structurally simple way, a friction increase due to not entirely avoidable deposits in the storage area of the valve stem is minimized.
  • FIG. 1 shows a hot gas control valve 10 according to the invention, which is in particular an exhaust gas control valve for an exhaust gas recirculation system of a vehicle internal combustion engine
  • the hot gas control valve 10 has a two-part housing 12 and a housing side mounted valve rod 14, on which a shut-off 16 is arranged, which is designed here as a valve plate and, as in FIG. 1 indicated, at least between a closed position and an open position can be moved back and forth.
  • valve rod 14 has a threaded spindle 18 and is mounted in a housing-side valve bearing 20, which is designed as a plain bearing bush and arranged in a bore 22 of the housing 12.
  • the valve rod 14 forms a direct extension of an output shaft of a drive unit 24 in the form of an electric drive (see FIG. 1 ) which, when actuated, causes the valve rod 14 to rotate.
  • a drive unit 24 in the form of an electric drive (see FIG. 1 ) which, when actuated, causes the valve rod 14 to rotate.
  • this rotational movement of the valve rod 14 is at least partially converted into a linear movement of the shut-16.
  • a recess 28 in the form of a radially continuous slot is provided in a sleeve portion 26 of the valve bearing 20 facing the shut-off body 16, wherein the radially inner edges or edges of the slot or recess 28 each form a scraping edge 30 (FIG. FIG. 2 ).
  • the scraping edges 30 terminate near the surface of the valve rod 14 and are used for scraping deposits that settle in the extended state of the valve rod 14 on the hot gas exposed portion of the valve stem 14.
  • the scraping edges 30 are thus arranged on the shut-off body 16 facing the end of the valve bearing 20.
  • the recess 28 is milled into the valve bearing 20, for example with a Stirnwalzen- or end mill, and has the shape of a polygonal U.
  • the scraping edges 30 thus extend parallel to the longitudinal axis Of course, the perpendicular to the longitudinal axis L extending edge of the slot, which forms the lower part of the polygonal U, a scraping edge 30 represent.
  • the recess 28 could also be provided only on the inside of the valve bearing 20 facing the valve rod 14, that is to say not radially configured continuously.
  • the embodiment shown with the radially continuous slot is to realize production technology easier.
  • a heat shield 32 is provided, which is designed as a cap, for example, made of stainless steel and the valve bearing 20 to the shut-off body 16 radially surrounds.
  • the heat shield 32 also serves as a coarse dirt cap, which reduces an entry of impurities from the exhaust gas into the valve bearing 20.
  • valve bearing 20 has, on the side facing away from the shut-off body 16, a section 34 in which an in FIG. 2 only indicated, the valve rod 14 facing cylindrical recess 36 is provided. This is executed in particular as an undercut.
  • the internal recess 36 the bearing gap between the valve bearing 20 and the valve rod 14 is increased, whereby a friction increase due to unavoidable deposits is minimized.
  • FIG. 3 shows an alternative embodiment of the hot gas control valve 10, which differs from the previously described only in that the recess 28 and the radially continuous slot is designed in the form of a V, whereby the scraping edges 30 are arranged obliquely to the longitudinal axis L of the valve rod 14.
  • a slot can be milled, for example, with a disc or sickle cutters in the valve bearing 20, more precisely, the socket portion 26.

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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)

Abstract

Ein Heißgasregelventil (10), insbesondere Abgasregelventil, hat ein Gehäuse (12) und einen an einer Ventilstange (14) angeordneten Absperrkörper (16), wobei die Ventilstange (14) gehäuseseitig gelagert ist und bei Betätigung des Absperrkörpers (16) eine Drehbewegung ausführt. Im Bereich des Gehäuses (12) ist wenigstens eine der Ventilstange (14) zugewandte, nahe der Oberfläche der Ventilstange (14) endende Schabekante (30) vorhanden zum Abschaben von sich auf dem im ausgefahrenen Zustand der Ventilstange (14) dem Heißgas ausgesetzten Abschnitt der Ventilstange (14) befindlichen Ablagerungen.A hot gas control valve (10), in particular exhaust control valve, has a housing (12) and a valve body (14) arranged shut-off body (16), wherein the valve rod (14) is mounted on the housing side and performs a rotational movement upon actuation of the shut-off (16). In the region of the housing (12) at least one of the valve rod (14) facing, near the surface of the valve rod (14) ending scraping edge (30) is present for scraping off on the in the extended state of the valve rod (14) exposed to the hot gas portion of Valve rod (14) located deposits.

Description

Die Erfindung betrifft ein Heißgasregelventil, insbesondere ein Abgasregelventil eines Fahrzeugs.The invention relates to a hot gas control valve, in particular an exhaust gas control valve of a vehicle.

Ein solches Heißgasregelventil wird z.B. als Abgasrückführventil in einem Abgasrückführsystem eines Verbrennungsmotors eingesetzt. In Verbrennungsmotoren werden bei hohen Verbrennungstemperaturen umweltschädliche Stickoxide gebildet, deren Entstehung reduziert werden kann, indem ein Teil des Abgases über ein Abgasrückführventil aus der Abgasleitung abgezweigt und der dem Motor zugeführten Frischluft beigemischt wird, um so die Sauerstoffkonzentration in der Ladeluft zu senken. Daraus resultiert ein Verbrennungsprozess bei niedrigeren Temperaturen, bei dem weniger Stickoxide entstehen. Eine noch höhere Effektivität in der Stickoxidreduzierung erhält man, wenn das rückgeführte Abgas gekühlt wird.Such a hot gas control valve is e.g. used as an exhaust gas recirculation valve in an exhaust gas recirculation system of an internal combustion engine. In internal combustion engines, environmentally harmful nitrogen oxides are formed at high combustion temperatures, the formation of which can be reduced by branching off a portion of the exhaust gas from the exhaust pipe via an exhaust gas recirculation valve and admixing the fresh air supplied to the engine so as to lower the oxygen concentration in the charge air. This results in a combustion process at lower temperatures, resulting in less nitrogen oxides. An even higher efficiency in nitrogen oxide reduction is obtained when the recirculated exhaust gas is cooled.

Insbesondere bei Dieselmotoren ist die Abgasrückführung eine entscheidende Maßnahme zur Senkung der Stickoxidemission, da der Einsatz von Abgasnachbehandlungssystemen allein zur Einhaltung umweltgesetzlicher Vorgaben nicht ausreichend ist.Exhaust gas recirculation is a crucial measure for reducing nitrogen oxide emissions, especially in diesel engines, since the use of exhaust aftertreatment systems alone is not sufficient to comply with environmental legislation.

Üblicherweise sind Abgasrückführventile nahe dem Auspuffkrümmer angebracht und werden folglich im heißen Abgasstrom bei Temperaturen von bis zu 850 °C betrieben. Zudem stellen Kontaminationen im Abgas wie etwa Rußpartikel, Motorölreste oder Dieselbestandteile erhöhte Anforderungen an das Ventil hinsichtlich gleichbleibender Funktion über die gesamte Fahrzeuglebensdauer, da sich diese Verbrennungsrückstände im Laufe der Zeit an den gasführenden Komponenten des Ventils ablagern.Exhaust gas recirculation valves are usually mounted close to the exhaust manifold and consequently are operated in the hot exhaust gas flow at temperatures of up to 850 ° C. In addition, contaminations in the exhaust gas, such as soot particles, engine oil residues or diesel components place increased demands on the valve for consistent performance over the entire vehicle life, as these combustion residues are deposited over time on the gas-carrying components of the valve.

Besonders schwerwiegend sind Verunreinigungen durch Kondensat- und Feststoffeinträge, die sich im Lagerbereich einer den Absperrkörper tragenden Ventilstange absetzen, da diese einen Lagerspalt zwischen der Ventilstange und dem Ventillager deutlich verringem können. Dies erhöht die Lagerreibung, wodurch das Ventil mit der Zeit immer schwergängiger wird, was letztendlich sogar zum Blockieren der Ventilstange und damit zum Ausfall des Bauteils führen kann.Particularly serious are contaminants due to condensate and solid deposits, which settle in the storage area of the shut-off valve-carrying valve rod, as they can significantly reduce a bearing gap between the valve stem and the valve bearing. This increases the bearing friction, which makes the valve more and more stiff over time, which ultimately even lead to blocking the valve stem and thus the failure of the component.

Es ist daher Aufgabe der Erfindung, ein Heißgasregelventil bereitzustellen, bei dem insbesondere der Lagerbereich einer beweglichen Ventilstange vor übermäßiger Verunreinigung geschützt ist.It is therefore an object of the invention to provide a hot gas control valve, in which in particular the storage area of a movable valve rod is protected from excessive contamination.

Erfindungsgemäß ist hierzu ein Heißgasregelventil, insbesondere Abgasregelventil, vorgesehen, mit einem Gehäuse und einem an einer Ventilstange angeordneten Absperrkörper, wobei die Ventilstange gehäuseseitig gelagert ist und bei Betätigung des Absperrkörpers eine Drehbewegung ausführt und wobei im Bereich des Gehäuses wenigstens eine der Ventilstange zugewandte, nahe der Oberfläche der Ventilstange endende Schabekante vorhanden ist zum Abschaben von sich auf dem im ausgefahrenen Zustand der Ventilstange dem Heißgas ausgesetzten Abschnitt der Ventilstange befindlichen Ablagerungen. Bei einer Drehung der Ventilstange werden also Verbrennungsrückstände, die sich auf der Ventilstange abgesetzt haben, an der Schabekante abgeschabt, wodurch insbesondere ein Lager der Ventilstange, das z.B. durch eine Durchführung im Gehäuse gebildet sein kann, vor übermäßigem Kondensat- und Feststoffeintrag geschützt ist. Dies gewährleistet die gleichbleibende Funktion des Ventils über die gesamte Fahrzeuglebensdauer.According to the invention for this purpose, a hot gas control valve, in particular exhaust control valve is provided with a housing and a valve rod arranged on a shut-off body, wherein the valve rod is mounted on the housing side and performs a rotational movement upon actuation of the shut-off and wherein in the region of the housing at least one of the valve rod facing, near the Surface of the valve rod endende scraping edge is present for scraping itself on the in the extended state of the valve rod exposed to the hot gas portion of the valve rod deposits. Thus, upon rotation of the valve stem, combustion residues deposited on the valve stem are scraped off at the scraping edge, whereby in particular a bearing of the valve stem, e.g. may be formed by a passage in the housing, is protected from excessive condensate and solids entry. This ensures the consistent function of the valve over the entire vehicle life.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist zumindest ein gehäuseseitiges Ventillager vorgesehen, das insbesondere als Gleitlagerbuchse ausgeführt ist. Diese ist z.B. in eine Bohrung im Ventilgehäuse eingesetzt.According to a preferred embodiment of the invention, at least one housing-side valve bearing is provided, which is designed in particular as a plain bearing bush. This is e.g. inserted into a bore in the valve body.

Es versteht sich von selbst, dass für Ventillager und Ventilstange eine reibungsarme Werkstoffpaarung verwendet wird, etwa eine Bronzelegierung für das Ventillager in Kombination mit einer Ventilstange aus Stahl.It goes without saying that a low-friction material pairing is used for valve-bearing and valve rod, such as a bronze alloy for the valve bearing in combination with a steel valve stem.

Eine fertigungstechnisch einfache Lösung ergibt sich dadurch, dass vorzugsweise die wenigstens eine Schabekante an dem dem Absperrkörper zugewandten Ende des Ventillagers angeordnet ist.A production-technically simple solution results from the fact that preferably the at least one scraping edge is arranged at the end of the valve bearing facing the shut-off body.

Alternativ kann die Schabekante auch direkt am Gehäuse vorgesehen oder in einem dem Absperrkörper zugewandten Bereich auf das Gehäuse aufgesetzt sein.Alternatively, the scraping edge can also be provided directly on the housing or placed on the housing in a region facing the shut-off body.

Bevorzugt ist die wenigstens eine Schabekante im Bereich einer Ausnehmung im Ventillager angeordnet. Die Ausnehmung kann dann die abgeschabten Stoffe aufnehmen.Preferably, the at least one scraping edge is arranged in the region of a recess in the valve bearing. The recess can then absorb the scraped off substances.

Insbesondere ist die wenigstens eine Schabekante durch eine Kante der Ausnehmung gebildet, d. h. die Schabekante steht gegenüber einer Innenwand des Ventillagers nicht vor.In particular, the at least one scraping edge is formed by an edge of the recess, d. H. the scraping edge is not opposite to an inner wall of the valve bearing.

Eine konstruktiv einfache Ausgestaltung ergibt sich, wenn die Ausnehmung in das Ventillager eingefräst ist. Hierzu kann ein Stirnwalzen- oder Fingerfräser bzw. ein Scheiben- oder Sichelfräser verwendet werden.A structurally simple embodiment results when the recess is milled into the valve bearing. For this purpose, a Stirnwalzen- or end mill or a disc or sickle cutters can be used.

Gemäß einer bevorzugten Ausführungsform hat das Ventillager einen zum Absperrkörper weisenden Buchsenabschnitt, der zumindest einen radial durchgehenden Schlitz aufweist, dessen radial innenseitiger Rand die Schabekante bildet. Dabei bildet der Schlitz, der in Radialrichtung gesehen als eckiges U, T oder als V ausgeführt sein kann, zusätzlich eine Ausnehmung im Ventillager, die die abgeschabten Stoffe aufnehmen kann.According to a preferred embodiment, the valve bearing has a bushing section facing the shut-off body, which has at least one radially continuous slot whose radially inner-side edge forms the scraping edge. In this case, the slot, which can be seen in the radial direction as an angular U, T or as V, additionally forms a recess in the valve bearing, which can absorb the scraped substances.

In einer Weiterbildung der Erfindung ist das Ventillager zum Absperrkörper hin radial von einem gehäuseseitigen Hitzeschild umgeben. Dieser ist vorzugsweise aus Edelstahl gefertigt und dient zugleich als Grobschmutzkappe. Alternativ kann der Hitzeschild ein einstückig angeformter Fortsatz des Gehäuses sein.In a development of the invention, the valve bearing is surrounded by the shut-off body radially from a housing-side heat shield. This is preferably made of stainless steel and also serves as a coarse dirt cap. Alternatively, the heat shield may be an integrally formed extension of the housing.

Eine auf den jeweiligen Anwendungsfal abgestimmte optimale Reinigungswirkung lässt sich erzielen, wenn die wenigstens eine Schabekante parallel oder schräg zur Längsachse der Ventilstange angeordnet ist.An adapted to the particular Anwendungsfal optimum cleaning effect can be achieved if the at least one scraping edge is arranged parallel or obliquely to the longitudinal axis of the valve rod.

In einer bevorzugten Ausführungsform ist eine Antriebseinheit mit einer Abtriebsachse vorgesehen, wobei die Ventilstange eine direkte Verlängerung der Abtriebsachse bildet. Auf diese Weise wird eine besonders kompakte Bauweise erreicht.In a preferred embodiment, a drive unit is provided with an output shaft, wherein the valve rod forms a direct extension of the output shaft. In this way, a particularly compact design is achieved.

Insbesondere kann die Ventilstange eine Gewindespindel aufweisen, die eine Drehbewegung der Ventilstange zumindest teilweise in eine lineare Bewegung des Absperrkörpers umwandelt. Ein solches Ventil findet beispielsweise als Hochdruck-Abgasrückführventil, VNT-Steller (VNT = Variable Nozzle Turbocharger) oder Umschaltklappe Anwendung.In particular, the valve rod may have a threaded spindle, which at least partially converts a rotational movement of the valve rod into a linear movement of the shut-off body. Such a valve is for example as High pressure exhaust gas recirculation valve, VNT (Variable Nozzle Turbocharger) actuator or diverter valve application.

Alternativ kann das Heißgasregelventil auch so ausgebildet sein, dass der Absperrkörper rotatorisch betätigt wird, etwa bei einer Drallklappe, Drosselklappe oder einem Niederdruck-Abgasrückführventil.Alternatively, the hot gas control valve may also be designed such that the shut-off body is rotationally actuated, for example in the case of a swirl flap, throttle flap or a low-pressure exhaust gas recirculation valve.

In einer Weiterbildung der Erfindungweist das Ventillager einen Abschnitt auf, in dem eine der Ventilstange zugewandte zylindrische Aussparung vorgesehen ist, die insbesondere als Freistich ausgeführt ist. Diese Aussparung dient der Vergrößerung des Lagerspalts zwischen dem Ventillager und der Ventilstange, wodurch auf konstruktiv einfache Weise eine Reibungserhöhung infolge von nicht gänzlich vermeidbaren Ablagerungen im Lagerbereich der Ventilstange minimiert wird.In a further development of the invention, the valve bearing on a portion in which a valve rod facing cylindrical recess is provided, which is designed in particular as a relief. This recess serves to increase the bearing gap between the valve bearing and the valve rod, which in a structurally simple way, a friction increase due to not entirely avoidable deposits in the storage area of the valve stem is minimized.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung zweier bevorzugter Ausführungsformen anhand der beigefügten Zeichnungen. In diesen zeigen:

  • Figur 1 eine Perspektivansicht eines Heißgasregelventils gemäß einer ersten Ausführungsform der Erfindung;
  • Figur 2 einen Halbschnitt durch einen Teil des Heißgasregelventils aus Figur 1; und
  • Figur 3 einen Halbschnitt durch einen Teil eines Heißgasregelventils gemäß einer zweiten Ausführungsform der Erfindung.
Further features and advantages of the invention will become apparent from the following description of two preferred embodiments with reference to the accompanying drawings. In these show:
  • FIG. 1 a perspective view of a hot gas control valve according to a first embodiment of the invention;
  • FIG. 2 a half-section through a part of the hot gas control valve FIG. 1 ; and
  • FIG. 3 a half-section through a portion of a hot gas control valve according to a second embodiment of the invention.

Figur 1 zeigt ein erfindungsgemäßes Heißgasregelventil 10, bei dem es sich insbesondere um ein Abgasregelventil für ein Abgasrückführsystem eines Fahrzeugverbrennungsmotors handelt FIG. 1 shows a hot gas control valve 10 according to the invention, which is in particular an exhaust gas control valve for an exhaust gas recirculation system of a vehicle internal combustion engine

Das Heißgasregelventil 10 weist ein zweiteilig ausgeführtes Gehäuse 12 sowie eine gehäuseseitig gelagerte Ventilstange 14 auf, an der ein Absperrkörper 16 angeordnet ist, der hier als Ventilteller ausgeführt ist und, wie in Figur 1 angedeutet, zumindest zwischen einer Schließstellung und einer Öffnungsstellung hin und her bewegt werden kann.The hot gas control valve 10 has a two-part housing 12 and a housing side mounted valve rod 14, on which a shut-off 16 is arranged, which is designed here as a valve plate and, as in FIG. 1 indicated, at least between a closed position and an open position can be moved back and forth.

Wie aus Figur 2 ersichtlich ist, weist die Ventilstange 14 eine Gewindespindel 18 auf und ist in einem gehäuseseitigen Ventillager 20 gelagert, das als Gleitlagerbuchse ausgeführt und in einer Bohrung 22 des Gehäuses 12 angeordnet ist.How out FIG. 2 it can be seen, the valve rod 14 has a threaded spindle 18 and is mounted in a housing-side valve bearing 20, which is designed as a plain bearing bush and arranged in a bore 22 of the housing 12.

Die Ventilstange 14 bildet dabei eine direkte Verlängerung einer Abtriebsachse einer Antriebseinheit 24 in Form eines elektrischen Antriebs (siehe Figur 1), der bei Betätigung die Ventilstange 14 in Drehung versetzt. Durch die Gewindespindel 18 wird diese Drehbewegung der Ventilstange 14 zumindest teilweise in eine lineare Bewegung des Absperrkörpers 16 umgewandelt.The valve rod 14 forms a direct extension of an output shaft of a drive unit 24 in the form of an electric drive (see FIG. 1 ) which, when actuated, causes the valve rod 14 to rotate. By the threaded spindle 18, this rotational movement of the valve rod 14 is at least partially converted into a linear movement of the shut-16.

Im Bereich des Gehäuses 12 ist in einem zum Absperrkörper 16 weisenden Buchsenabschnitt 26 des Ventillagers 20 eine Ausnehmung 28 in Form eines radial durchgehenden Schlitzes vorgesehen, wobei die radial innenseitigen Ränder bzw. Kanten des Schlitzes bzw. der Ausnehmung 28 je eine Schabekante 30 bilden (Figur 2). Die Schabekanten 30 enden nahe der Oberfläche der Ventilstange 14 und dienen zum Abschaben von Ablagerungen, die sich im ausgefahrenen Zustand der Ventilstange 14 auf dem dem Heißgas ausgesetzten Abschnitt der Ventilstange 14 absetzen. Die Schabekanten 30 sind somit an dem dem Absperrkörper 16 zugewandten Ende des Ventillagers 20 angeordnet Die Ausnehmung 28 ist in das Ventillager 20 eingefräst, beispielsweise mit einem Stirnwalzen- oder Fingerfräser, und hat die Form eines eckigen U. Die Schabekanten 30 verlaufen somit parallel zur Längsachse L der Ventilstange 14. Natürlich kann auch der senkrecht zur Längsachse L verlaufende Rand des Schlitzes, der den unteren Teil des eckigen U bildet, eine Schabekante 30 darstellen.In the region of the housing 12, a recess 28 in the form of a radially continuous slot is provided in a sleeve portion 26 of the valve bearing 20 facing the shut-off body 16, wherein the radially inner edges or edges of the slot or recess 28 each form a scraping edge 30 (FIG. FIG. 2 ). The scraping edges 30 terminate near the surface of the valve rod 14 and are used for scraping deposits that settle in the extended state of the valve rod 14 on the hot gas exposed portion of the valve stem 14. The scraping edges 30 are thus arranged on the shut-off body 16 facing the end of the valve bearing 20. The recess 28 is milled into the valve bearing 20, for example with a Stirnwalzen- or end mill, and has the shape of a polygonal U. The scraping edges 30 thus extend parallel to the longitudinal axis Of course, the perpendicular to the longitudinal axis L extending edge of the slot, which forms the lower part of the polygonal U, a scraping edge 30 represent.

Alternativ zur gezeigten Ausgestaltung könnte die Ausnehmung 28 auch nur auf der der Ventilstange 14 zugewandten Innenseite des Ventillagers 20 vorgesehen sein, also nicht radial durchgehend ausgestaltet sein. Die gezeigte Ausgestaltung mit dem radial durchgehenden Schlitz ist jedoch fertigungstechnisch einfacher zu realisieren.As an alternative to the embodiment shown, the recess 28 could also be provided only on the inside of the valve bearing 20 facing the valve rod 14, that is to say not radially configured continuously. However, the embodiment shown with the radially continuous slot is to realize production technology easier.

Weiterhin ist ein Hitzeschild 32 vorgesehen, der als Kappe z.B. aus Edelstahl ausgeführt ist und das Ventillager 20 zum Absperrkörper 16 hin radial umgibt. Der Hitzeschild 32 dient zugleich als Grobschmutzkappe, die einen Eintrag von Verunreinigungen aus dem Abgas in das Ventillager 20 verringert.Furthermore, a heat shield 32 is provided, which is designed as a cap, for example, made of stainless steel and the valve bearing 20 to the shut-off body 16 radially surrounds. The heat shield 32 also serves as a coarse dirt cap, which reduces an entry of impurities from the exhaust gas into the valve bearing 20.

Um das Reibungsverhaften der Ventilstange 14 im Ventillager 20 weiter zu verbessern, weist das Ventillager 20 auf der dem Absperrkörper 16 abgewandten Seite einen Abschnitt 34 auf, in dem eine in Figur 2 nur angedeutete, der Ventilstange 14 zugewandte zylindrische Aussparung 36 vorgesehen ist. Diese ist insbesondere als Freistich ausgeführt. Durch die innenliegende Aussparung 36 wird der Lagerspalt zwischen dem Ventillager 20 und der Ventilstange 14 vergrößert, wodurch eine Reibungserhöhung infolge von unvermeidbaren Ablagerungen minimiert wird.In order to further improve the friction locking of the valve rod 14 in the valve bearing 20, the valve bearing 20 has, on the side facing away from the shut-off body 16, a section 34 in which an in FIG. 2 only indicated, the valve rod 14 facing cylindrical recess 36 is provided. This is executed in particular as an undercut. By the internal recess 36, the bearing gap between the valve bearing 20 and the valve rod 14 is increased, whereby a friction increase due to unavoidable deposits is minimized.

Figur 3 zeigt eine alternative Ausgestaltung des Heißgasregelventils 10, die sich von der bisher beschriebenen nur dadurch unterscheidet, dass die Ausnehmung 28 bzw. der radial durchgehende Schlitz in Form eines V ausgeführt ist, wodurch die Schabekanten 30 schräg zur Längsachse L der Ventilstange 14 angeordnet sind. Ein derartiger Schlitz kann beispielsweise mit einem Scheiben- oder Sichelfräser in das Ventillager 20, genauer den Buchsenabschnitt 26, eingefräst werden. FIG. 3 shows an alternative embodiment of the hot gas control valve 10, which differs from the previously described only in that the recess 28 and the radially continuous slot is designed in the form of a V, whereby the scraping edges 30 are arranged obliquely to the longitudinal axis L of the valve rod 14. Such a slot can be milled, for example, with a disc or sickle cutters in the valve bearing 20, more precisely, the socket portion 26.

Claims (12)

Heißgasregelventil, insbesondere Abgasregelventil, mit einem Gehäuse (12) und einem an einer Ventilstange (14) angeordneten Absperrkörper (16), wobei die Ventilstange (14) gehäuseseitig gelagert ist und bei Betätigung des Absperrkörpers (16) eine Drehbewegung ausführt, und wobei im Bereich des Gehäuses (12) wenigstens eine der Ventilstange (14) zugewandte, nahe der Oberfläche der Ventilstange (14) endende Schabekante (30) vorhanden ist zum Abschaben von sich auf dem im ausgefahrenen Zustand der Ventilstange (14) dem Heißgas ausgesetzten Abschnitt der Ventilstange (14) befindlichen Ablagerungen.Hot gas control valve, in particular exhaust control valve, comprising a housing (12) and a valve body (14) arranged shut-off body (16), wherein the valve rod (14) is mounted on the housing side and upon actuation of the shut-off (16) performs a rotational movement, and wherein in the area of the housing (12) at least one of the valve rod (14) facing, near the surface of the valve rod (14) ending scraping edge (30) is present for scraping off on the in the extended state of the valve rod (14) exposed to the hot gas portion of the valve rod ( 14) located deposits. Heißgasregelventil nach Anspruch 1, dadurch gekennzeichnet, dass zumindest ein gehäuseseitiges Ventillager (20) vorgesehen ist, das insbesondere als Gleitlagerbuchse ausgeführt ist.Hot gas control valve according to claim 1, characterized in that at least one housing-side valve bearing (20) is provided, which is designed in particular as a plain bearing bush. Heißgasregelventil nach Anspruch 2, dadurch gekennzeichnet, dass die wenigstens eine Schabekante (30) an dem dem Absperrkörper (16) zugewandten Ende des Ventillagers (20) angeordnet ist.Hot gas control valve according to claim 2, characterized in that the at least one scraping edge (30) on the said shut-off (16) facing the end of the valve bearing (20) is arranged. Heißgasregelventil nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die wenigstens eine Schabekante (30) im Bereich einer Ausnehmung (28) im Ventillager (20) angeordnet ist.Hot gas control valve according to claim 2 or 3, characterized in that the at least one scraping edge (30) in the region of a recess (28) in the valve bearing (20) is arranged. Heißgasregelventil nach Anspruch 4, dadurch gekennzeichnet, dass die wenigstens eine Schabekante (30) durch eine Kante der Ausnehmung (28) gebildet istHot gas control valve according to claim 4, characterized in that the at least one scraping edge (30) is formed by an edge of the recess (28) Heißgasregelventil nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Ausnehmung (28) in das Ventillager (20) eingefräst ist.Hot gas control valve according to claim 4 or 5, characterized in that the recess (28) is milled into the valve bearing (20). Heißgasregelventil nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass das Ventillager (20) einen zum Absperrkörper (16) weisenden Buchsenabschnitt (26) hat, der zumindest einen radial durchgehenden Schlitz aufweist, dessen radial innenseitiger Rand die Schabekante (30) bildet.Hot gas control valve according to one of claims 2 to 6, characterized in that the valve bearing (20) has a shut-off (16) facing bushing portion (26) which has at least one radially continuous slot whose radially inner edge forms the scraping edge (30). Heißgasregelventil nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, dass das Ventillager (20) zum Absperrkörper (16) hin radial von einem gehäuseseitigen Hitzeschild (32) umgeben ist.Hot gas control valve according to one of claims 2 to 7, characterized in that the valve bearing (20) to the shut-off (16) is radially surrounded by a housing-side heat shield (32). Heißgasregelventil nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die wenigstens eine Schabekante (30) parallel oder schräg zur Längsachse (L) der Ventilstange (14) angeordnet ist.Hot gas control valve according to one of the preceding claims, characterized in that the at least one scraping edge (30) is arranged parallel or obliquely to the longitudinal axis (L) of the valve rod (14). Heißgasregelventil nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Antriebseinheit (24) mit einer Abtriebsachse vorgesehen ist, wobei die Ventilstange (14) eine direkte Verlängerung der Abtriebsachse bildet.Hot gas control valve according to one of the preceding claims, characterized in that a drive unit (24) is provided with an output shaft, wherein the valve rod (14) forms a direct extension of the output shaft. Heißgasregelventil nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Ventilstange (14) eine Gewindespindel (18) aufweist, die eine Drehbewegung der Ventilstange (14) in eine lineare Bewegung des Absperrkörpers (16) umwandelt.Hot gas control valve according to one of the preceding claims, characterized in that the valve rod (14) has a threaded spindle (18) which converts a rotational movement of the valve rod (14) into a linear movement of the shut-off body (16). Heißgasregelventil nach einem der Ansprüche 2 bis 11, dadurch gekennzeichnet, dass das Ventillager (20) einen Abschnitt (34) aufweist, in dem eine der Ventilstange (14) zugewandte zylindrische Aussparung (36) vorgesehen ist, die insbesondere als Freistich ausgeführt ist.Hot gas control valve according to one of claims 2 to 11, characterized in that the valve bearing (20) has a portion (34) in which a valve rod (14) facing cylindrical recess (36) is provided, which is designed in particular as a relief groove.
EP16165779.6A 2015-05-22 2016-04-18 Hot gas regulating valve Active EP3095997B1 (en)

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DE102018213344A1 (en) * 2018-08-08 2020-02-13 Bayerische Motoren Werke Aktiengesellschaft Method for controlling a hot gas control valve, in particular an exhaust gas control valve, of a vehicle

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