EP0964147B1 - Exhaust gas recirculation valve for combustion engines - Google Patents

Exhaust gas recirculation valve for combustion engines Download PDF

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Publication number
EP0964147B1
EP0964147B1 EP99110259A EP99110259A EP0964147B1 EP 0964147 B1 EP0964147 B1 EP 0964147B1 EP 99110259 A EP99110259 A EP 99110259A EP 99110259 A EP99110259 A EP 99110259A EP 0964147 B1 EP0964147 B1 EP 0964147B1
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EP
European Patent Office
Prior art keywords
exhaust gas
gas recirculation
valve
valve according
valve seat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99110259A
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German (de)
French (fr)
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EP0964147A3 (en
EP0964147A2 (en
Inventor
Frank Zimmermann
Thomas Peuker
Andreas Kaiser
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Gustav Wahler GmbH and Co KG
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Gustav Wahler GmbH and Co KG
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Application filed by Gustav Wahler GmbH and Co KG filed Critical Gustav Wahler GmbH and Co KG
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Classifications

    • 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
    • F02M26/68—Closing members; Valve seats; Flow passages
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
    • 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

Definitions

  • valve member designed as a valve plate
  • the outer edge in an annular collar same cross section that passes in one of the valve seat surface of the Axially projecting away from the housing part and on the outer Circumferential surface in the arc area is the ring surface acting as a sealing surface having.
  • This sealing surface is approximately quarter-circular in cross-section a correspondingly arcuate valve seat surface in one in the Assigned part of the valve seat used.
  • the valve seat consists of a Ring, the associated on the inner peripheral surface, in cross section has quarter-circle-shaped valve seat.
  • the plate-shaped valve member moves with the outer ring surface in Axial direction away from the inner peripheral surface of the valve seat.
  • the Closing movement of the valve moves the valve member axially in the direction the valve seat, whereby the closed position is reached when the in Cross-section quarter-circular outer peripheral surface of the valve plate in surface contact with the corresponding inner peripheral surface of the Valve seat arrives, the outer annular surface of the valve member having a positive fit is received in the inner peripheral surface of the valve seat.
  • Exhaust gas recirculation valves for internal combustion engines are also known (DE 196 07 810 A1), in which the valve member from below for closing the Valve passage is created against the valve seat surface.
  • the valve member is seated usually at the end of an actuator in the form of a rod, one Ram, a shaft or the like, on which an actuator, preferably e.g. on electric actuator for actuating the valve element in the opening direction or closing direction attacks.
  • an actuator preferably e.g. on electric actuator for actuating the valve element in the opening direction or closing direction attacks.
  • a Electric motor a stepper motor, an electric rotary magnet or the like. electromagnetic turntable may be provided.
  • the valve seat surface is approximately frustoconical in shape tapered inclined surface in a plate-shaped upper part of the housing part educated.
  • the valve member is designed as a flat plate, of which the Valve seat surface associated ring surface also as approximately frustoconical tapered inclined surface is formed. In the closed position of the Valve are the valve member side ring surface and the valve seat surface of the Valve passages on top of each other.
  • exhaust gas recirculation valves of the type mentioned arise in particular in connection with the exhaust gas cooling and when cooling this in the area between the valve surfaces sitting on top of each other thereby problems that at low temperatures on the valve member and on the valve passage adjacent Areas of the housing part liquid, condensate and / or Collect particles that harden when cooled and that valve surfaces sitting on top of each other, for example similar to adhesive can stick together, creating a reliable subsequent opening function and another one at all reliable operation of the exhaust gas recirculation valve is at risk becomes or becomes impossible.
  • the invention has for its object an exhaust gas recirculation valve of the type mentioned at the beginning that a perfect opening or closing function guaranteed between the valve member and the valve seat is.
  • the at least one top recording on Valve member which is provided there recessed, forms a Reservoir for any liquid, condensate and / or particles in this at least one recording get in, e.g. can flow in, so that these thereby in a particularly simple manner from the ring surface of the valve member and / or the valve seat surface of the Housing part are kept away.
  • Fig. 1 is only schematically the one of interest here Part of an otherwise at least essentially known Exhaust gas recirculation valve 10 shown for exhaust gas recirculation determined in internal combustion engines and e.g. into an intake manifold the internal combustion engine is installed. It points a lower housing part 11, on which no further Exhaust gas recirculation line shown, illustrated by the Arrow 12 is fed.
  • the housing part 11 contains one Valve passage 13 with an annular valve seat surface 14, which cooperates with an associated valve member 15, the one of the valve seat surface 14 associated ring surface 16 having.
  • the valve member 15 is in a conventional manner as is not shown further, at the lower end of an actuator in the form of a rod, a plunger, a shaft od.dergl.
  • an actuator on this actuator attacks e.g. in the form of an electric actuator, e.g. from an electric motor or stepper motor or rotary magnets or the like. can exist.
  • the annular surface 16 of the valve member 15 is axial on one protruding collar 40 of the valve member 15 is formed, which is arranged on the top of the valve member 15.
  • valve seat surface 14 is on the lower side of the Housing part 11 arranged, the bottom and in Direction of valve seat surface 14 in the direction of arrow 12 the exhaust gas can be supplied.
  • the valve member 15 is on the Bottom of the housing part 11 arranged and from below against the valve seat surface 14 to bring about the in Fig. 1 shown closed position can be applied.
  • valve seat surface 14 on the underside is an inclined surface 44 formed, which face away from the valve member 15 Axial direction tapered approximately frustoconical.
  • the ring surface 16 formed on the upper side of the ring collar 40 of the valve member 15 is also an inclined surface 46 formed in the valve seat 14 facing Axial direction tapered approximately frustoconical.
  • the taper angle of the inclined surfaces 44 and 46 is according to FIG. 1 and 2 are of equal size and are of the order of magnitude about 120 °.
  • FIG. 2 reveals, closes the annular surface 16, in particular in the training as an inclined surface 46, the collar 40 with their outside diameter and also with their inside diameter each essentially with the corresponding outer diameter or inner diameter of the inclined surface 44 Valve seat 14 from.
  • the projecting collar 40 is radially outside of one to the longitudinal center axis 9 approximately coaxial outer cylinder surface 48 limited.
  • valve seat surface 14 designed as an inclined surface 44 is approximately radially inward from one to the longitudinal central axis 9 limited coaxial inner cylinder surface 47 which the Valve passage 13 surrounds and defines.
  • valve seat surface 14 of the housing part 11 is on one relatively thin in cross section, approximately disc-shaped Head area 49 of the housing part 11 is formed.
  • valve seat surface 14 designed as an inclined surface 44 adjoins an annular surface 45 radially on the outside lies within a radial plane that is approximately rectangular is aligned with the longitudinal central axis 9.
  • the top of the Head area 49 is through a to this annular surface 45th approximately parallel head surface 50 limited.
  • the valve body 15 has on the valve seat surface 14 facing top 51 one or more recessed open, upwardly open receptacles 52 as collecting spaces, in which there is liquid, condensate and / or particles can collect, especially when the exhaust gas recirculation valve cools down 10 from the exhaust gas, in particular from diesel exhaust gas, can fail.
  • the at least one receptacle 52 takes such particles, liquids or the like. on, so that these from the inclined surfaces interacting 44 and 46 should be kept as far as possible.
  • FIGS. 1 and 2 has the valve body 15 on the upper side as recessed Receptacle 52 at least one recessed annular groove, which e.g. has a width of about 2 mm to 3 mm and the radially outside through the axially projecting ring collar 40 is limited.
  • Radially inside connects to the least a top receptacle 52, in particular an annular groove, one for Longitudinal central axis 9 rising conical surface 53, the approximately frustoconical in the direction of the valve seat surface 14 tapered and axially over the collar 40 and the Ring surface 16 also protrudes upwards.
  • the axial projection dimension the conical surface 53 lies e.g. in the order of magnitude of 2 mm.
  • This configuration of the exhaust gas recirculation valve 10 according to 1 and 2 is a flawless with simple means Closing function or opening function between the valve seat surface 14 and the valve member 15 ensures that an accumulation of particles, liquid, condensate or the like, which fail during cooling from the exhaust gas, in Area of the inclined surfaces 44 and 46 acting with one another as far as possible is excluded.
  • FIG. 3 are in the second embodiment for the parts that correspond to the first exemplary embodiment in FIG. 1 and 2 correspond to the same reference numerals, so that thereby avoiding repetitions on the Description of the first embodiment referred is.
  • valve seat surface 14 is designed as a flat surface, which are within a to the longitudinal central axis of the valve passage 13 extends approximately rectangular radial plane.
  • the cutting edge 60 is radially outward from that to the longitudinal central axis the valve passage 13 approximately coaxial outer Cylinder surface 48 and radially inward from an inner bevel surface 61 that defines itself with the formation of the cutting edge 60 in the ring surface 16, which presents itself as a ring line to meet.
  • the inner inclined surface 61 tapers in the Axial direction approximately frustoconical, that of the flat valve seat 14 is turned away. Also in this embodiment has the valve member 15 as in the first embodiment at least one recessed top, upward open image corresponding to the image 52 on.
  • the cutting edge 60 is the size in the closed position 3 in contact with each other Areas kept as small as possible so that any particles, liquids, condensate sticking in between or the like, which, when cured, is about sticking together could result in contact surfaces, practically none Have area approach.
  • a sharp tear-off edge radially inward in the form of the inner inclined surface 61 and radially outward in the form of the outer cylinder surface 48 created by tearing off any accumulations is promoted. Due to the training as a cutting edge 60 this, moreover, during the transfer of the valve member 15 any accumulations in the closed position according to FIG. 3, that should adhere to the valve seat surface 14, cut and break open, so that this of the Valve seat 14 are detached.
  • the cutting edge 60 is formed in the region of the valve seat surface 14, the annular member 16 on the valve member side then e.g. can be designed as a flat ring surface.
  • the cutting edge is 60 radially inward from one to the longitudinal central axis of the valve passage 13 approximately coaxial inner cylinder surface 62 and defined radially on the outside by an outer inclined surface 63, which meet to form the cutting edge 60, the Ring surface 16 in turn represents a circle.
  • the outer bevel 63 tapers in the shape of a truncated cone Axial direction, which faces the flat valve seat surface 14 is. 4 are the same Advantages as achieved by that in Fig. 3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)

Description

Bei einem bekannten Abgasrückführventil dieser Art (DE 195 39 921 C1) ist das Ventilglied als Ventilteller ausgebildet, der am Außenrand in einen Ringbund gleichen Querschnitts übergeht, der in einer der Ventilsitzfläche des Gehäuseteils abgewandten Richtung axial hochragt und auf der äußeren Umfangsfläche im Bogenbereich die als Dichtfläche wirkende Ringfläche aufweist. Dieser im Querschnitt etwa viertelkreisförmig gebogenen Dichtfläche ist eine entsprechend im Querschnitt bogenförmige Ventilsitzfläche in einem in den Gehäuseteil eingesetzten Ventilsitz zugeordnet. Der Ventilsitz besteht aus einem Ring, der auf der inneren Umfangsfläche die zugeordnete, im Querschnitt viertelkreisbogenförmige Ventilsitzfläche aufweist. Beim Öffnen des Ventils bewegt sich das tellerförmige Ventilglied mit der äußeren Ringfläche in Axialrichtung weg von der inneren Umfangsfläche des Ventilsitzes. Bei der Schließbewegung des Ventils bewegt sich das Ventilglied axial in Richtung auf den Ventilsitz zu, wobei die Schließstellung dann erreicht ist, wenn die im Querschnitt viertelkreisförmige äußere Umfangsfläche des Ventiltellers in flächigen Kontakt mit der entsprechenden inneren Umfangsfläche des Ventilsitztes gelangt, wobei die äußere Ringfläche des Ventilgliedes formschlüssig in der inneren Umfangsfläche des Ventilsitzes aufgenommen wird.In a known exhaust gas recirculation valve of this type (DE 195 39 921 C1) that is Valve member designed as a valve plate, the outer edge in an annular collar same cross section that passes in one of the valve seat surface of the Axially projecting away from the housing part and on the outer Circumferential surface in the arc area is the ring surface acting as a sealing surface having. This sealing surface is approximately quarter-circular in cross-section a correspondingly arcuate valve seat surface in one in the Assigned part of the valve seat used. The valve seat consists of a Ring, the associated on the inner peripheral surface, in cross section has quarter-circle-shaped valve seat. When opening the valve the plate-shaped valve member moves with the outer ring surface in Axial direction away from the inner peripheral surface of the valve seat. In the Closing movement of the valve moves the valve member axially in the direction the valve seat, whereby the closed position is reached when the in Cross-section quarter-circular outer peripheral surface of the valve plate in surface contact with the corresponding inner peripheral surface of the Valve seat arrives, the outer annular surface of the valve member having a positive fit is received in the inner peripheral surface of the valve seat.

Es sind ferner Abgasrückführventile für Brennkraftmaschinen bekannt (DE 196 07 810 A1), bei den das Ventilglied von unten her zum Schließen des Ventildurchlasses gegen die Ventilsitzfläche angelegt wird. Das Ventilglied sitzt in der Regel am Ende eines Betätigungsgliedes in Form einer Stange, eines Stößels, eines Schaftes od. dgl., an dem ein Stellantrieb, mit Vorzug z.B. ein elektrischer Stellantrieb, zur Betätigung des Ventilgliedes in Öffnungsrichtung bzw. Schließrichtung angreift. Beim elektrischen Stellantrieb kann ein Elektromotor, ein Schrittmotor, ein elektrischer Drehmagnet od. dgl. elektromagnetischer Drehteller vorgesehen sein. Bei diesem Abgasrückführventil ist die Ventilsitzfläche als sich nach oben hin etwa kegelstumpfförmig verjüngende Schrägfläche in einem plattenförmigen Oberteil des Gehäuseteils ausgebildet. Das Ventilglied ist als flacher Teller gestaltet, wobei dessen der Ventilsitzfläche zugeordnete Ringfläche ebenfalls als sich etwa kegelstumpfförmig verjüngende Schrägfläche ausgebildet ist. In der Schließstellung des Ventils liegen die ventilgliedseitige Ringfläche und die Ventilsitzfläche des Ventildurchlasses aufeinander.Exhaust gas recirculation valves for internal combustion engines are also known (DE 196 07 810 A1), in which the valve member from below for closing the Valve passage is created against the valve seat surface. The valve member is seated usually at the end of an actuator in the form of a rod, one Ram, a shaft or the like, on which an actuator, preferably e.g. on electric actuator for actuating the valve element in the opening direction or closing direction attacks. With the electric actuator, a Electric motor, a stepper motor, an electric rotary magnet or the like. electromagnetic turntable may be provided. With this exhaust gas recirculation valve the valve seat surface is approximately frustoconical in shape tapered inclined surface in a plate-shaped upper part of the housing part educated. The valve member is designed as a flat plate, of which the Valve seat surface associated ring surface also as approximately frustoconical tapered inclined surface is formed. In the closed position of the Valve are the valve member side ring surface and the valve seat surface of the Valve passages on top of each other.

Bei Abgasrückführventilen genannter Art, insbesondere beim Einsatz für DieselBrennkraftmaschinen, ergeben sich insbesondere im Zusammenhang mit der Abgaskühlung und bei der Abkühlung dieses im Bereich zwischen den aufeinandersitzenden Ventilflächen dadurch Probleme, daß sich bei niedrigen Temperaturen am Ventilglied und an den dem Ventildurchlaß benachbarten Bereichen des Gehäuseteils Flüssigkeit, Kondensat und/oder Partikel ansammeln, die bei Akühlung aushärten und die aufeinandersitzenden Ventilflächen etwa klebstoffähnlich miteinander verkleben können, wodurch eine zuverlässige anschließende Öffnungsfunktion und überhaupt ein weiterer zuverlässiger Betrieb des Abgasrückführventils gefährdet wird oder gar unmöglich wird. With exhaust gas recirculation valves of the type mentioned, in particular when used for diesel internal combustion engines, arise in particular in connection with the exhaust gas cooling and when cooling this in the area between the valve surfaces sitting on top of each other thereby problems that at low temperatures on the valve member and on the valve passage adjacent Areas of the housing part liquid, condensate and / or Collect particles that harden when cooled and that valve surfaces sitting on top of each other, for example similar to adhesive can stick together, creating a reliable subsequent opening function and another one at all reliable operation of the exhaust gas recirculation valve is at risk becomes or becomes impossible.

Der Erfindung liegt die Aufgabe zugrunde, ein Abgasrückführyentil der eingangs genannten Art so auszubilden, daß eine einwandfreie Öffnungsfunktion bzw. Schließfunktion zwischen dem Ventilglied und dem Ventilsitz gewährleistet ist.The invention has for its object an exhaust gas recirculation valve of the type mentioned at the beginning that a perfect opening or closing function guaranteed between the valve member and the valve seat is.

Die Aufgabe ist bei einem Abgasrückführventil der eingangs genannten Art gemäß der Erfindung durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte weitere Erfindungsmerkmale und Ausgestaltungen ergeben sich aus den Ansprüchen 2 bis 27. Beim erfindungsgemäßen Abgasrückführventil ist durch diese besondere Gestaltung des Ventilgliedes der Ansammlung von Flüssigkeit, Kondensat und/oder Partikeln entgegengewirkt, die sich am Ventilglied und auch an benachbarten Bereichen des Ventildurchlasses nicht anlagern können. Ferner ist durch die besondere Geometrie des Ringbundes des Ventilgliedes und/oder der gehäuseteilseitigen Ventilsitzfläche eine vorteilhafte Durchflußcharakteristik und gute Durchströmung gewährleistet, so daß etwaige, sich dort möglicherweise ablagernde Flüssigkeit, Kondensat und/oder Partikel schon aufgrund der Strömung mitgerissen werden und auch dadurch einer etwaigen Ablagerung entgegengewirkt ist. Aufgrund der Geometrie des Ventilgliedes und/oder des Ventilsitzes ist somit auf Dauer eine einwandfreie Schließfunktion bzw. öffnungsfunktion des Ventiles gewährleistet, und dies mit einfachen und kostengünstigen Mitteln. Die mindestens eine oberseitige Aufnahme am Ventilglied, die dort vertieft vorgesehen ist, bildet ein Aufnahmereservoir für etwaige Flüssigkeit, Kondensat und/oder Partikel, die in diese mindestens eine Aufnahme hineingelangen, z.B. hineinfließen, können, so daß diese dadurch in besonders einfacher Weise von der Ringfläche des Ventilgliedes und/oder der Ventilsitzfläche des Gehäuseteils ferngehalten werden. Ferner unterstützen vorhandene schräge Flächen beim Ventilglied und im Bereich des Ventildurchlasses eine strömungstechnische Leitung von Flüssigkeit, Kondensat und/oder Partikel in der Weise, daß diese gezielt von den miteinanderwirkenden Dichtflächen, das heißt der Ringfläche und der Ventilsitzfläche, ferngehalten werden und z.B., soweit vorhanden, gezielt in die mindestens eine Aufnahme hineingeführt werden.The task is the beginning of an exhaust gas recirculation valve mentioned type according to the invention by the features of Claim 1 solved. Advantageous further features of the invention and configurations result from claims 2 to 27. In the exhaust gas recirculation valve according to the invention is through this particular design of the valve member of the collection counteracted by liquid, condensate and / or particles, which are on the valve member and also on neighboring ones Can not attach areas of the valve passage. Furthermore, the special geometry of the collar of the Valve member and / or the valve seat surface on the housing part side an advantageous flow characteristic and good flow guaranteed, so that any, itself there may be deposits of liquid, condensate and / or particles are already entrained due to the flow are counteracted and thereby any deposit is. Due to the geometry of the valve member and / or the valve seat is thus a flawless in the long run Closing function or opening function of the valve guaranteed, and with simple and inexpensive Means. The at least one top recording on Valve member, which is provided there recessed, forms a Reservoir for any liquid, condensate and / or particles in this at least one recording get in, e.g. can flow in, so that these thereby in a particularly simple manner from the ring surface of the valve member and / or the valve seat surface of the Housing part are kept away. Also support existing ones sloping surfaces at the valve member and in the area of the valve passage a fluidic line from Liquid, condensate and / or particles in such a way that these from the interacting sealing surfaces, that is, the annular surface and the valve seat surface, kept away and e.g., if available, targeted to the at least one intake can be inserted.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung.Further details and advantages of the invention emerge from the description below.

Der vollständige Wortlaut der Ansprüche ist vorstehend allein zur Vermeidung unnötiger Wiederholungen nicht wiedergegeben, sondern statt dessen lediglich durch Nennung der Anspruchsnummern darauf Bezug genommen, wodurch jedoch alle diese Anspruchsmerkmale als an dieser Stelle ausdrücklich und erfindungswesentlich offenbart zu gelten haben. Dabei sind alle in der vorstehenden und folgenden Beschreibung erwähnten Merkmale sowie auch die allein aus der Zeichnung entnehmbaren Merkmale weitere Bestandteile der Erfindung, auch wenn sie nicht besonders hervorgehoben und insbesondere nicht in den Ansprüchen erwähnt sind.The full wording of the claims is above not reproduced just to avoid unnecessary repetitions, but instead only by naming the Claim numbers referenced it, however, all these claim characteristics as express at this point and disclosed to be essential to the invention. there are all in the foregoing and following description Features mentioned as well as those from the drawing alone removable features further components of the invention, even if not particularly highlighted and in particular are not mentioned in the claims.

Die Erfindung ist nachfolgend anhand von in den Zeichnungen gezeigten Ausführungsbeispielen näher erläutert. Es zeigen:

Fig. 1
einen schematischen senkrechten Schnitt lediglich des Ventildurchlaßbereiches eines Abgasrückführventiles gemäß einem ersten Ausführungsbeispiel,
Fig. 2
einen Ausschnitt II in Fig. 1 in größerem Maßstab,
Fig. 3 und 4
jeweils einen schematischen Schnitt einer Teilansicht etwa entsprechend derjenigen in Fig. 2 gemäß einem zweiten bzw. dritten Ausführungsbeispiel.
The invention is explained in more detail below with reference to exemplary embodiments shown in the drawings. Show it:
Fig. 1
2 shows a schematic vertical section of only the valve passage area of an exhaust gas recirculation valve according to a first exemplary embodiment,
Fig. 2
a section II in Fig. 1 on a larger scale,
3 and 4
each a schematic section of a partial view approximately corresponding to that in Fig. 2 according to a second or third embodiment.

In Fig. 1 ist schematisch lediglich der hier interessierende Teil eines ansonsten zumindest im wesentlichen bekannten Abgasrückführventiles 10 gezeigt, das zur Abgasrückführung bei Brennkraftmaschinen bestimmt und z.B. in ein Ansaugsammelrohr der Brennkraftmaschine eingebaut ist. Es weist einen unteren Gehäuseteil 11 auf, dem über eine nicht weiter gezeigte Abgasrückführleitung Abgas, verdeutlicht durch den Pfeil 12, zugeführt wird. Der Gehäuseteil 11 enthält einen Ventildurchlaß 13 mit einer ringförmigen Ventilsitzfläche 14, die mit einem zugeordneten Ventilglied 15 zusammenwirkt, das eine der Ventilsitzfläche 14 zugeordnete Ringfläche 16 aufweist. Das Ventilglied 15 ist in herkömmlicher Weise, wie nicht weiter gezeigt ist, am unteren Ende eines Betätigungsgliedes in Form einer Stange, eines Stößels, eines Schaftes od.dergl. befestigt, das in einem entsprechenden Gehäuse koaxial zur Längsmittelachse 9 verschiebbar geführt ist , wobei an diesem Betätigungsglied üblicherweise ein Stellantrieb angreift, z.B. in Form eines elektrischen Stellantriebes, der z.B. aus einem Elektromotor oder Schrittmotor oder Drehmagneten od.dergl. bestehen kann.In Fig. 1 is only schematically the one of interest here Part of an otherwise at least essentially known Exhaust gas recirculation valve 10 shown for exhaust gas recirculation determined in internal combustion engines and e.g. into an intake manifold the internal combustion engine is installed. It points a lower housing part 11, on which no further Exhaust gas recirculation line shown, illustrated by the Arrow 12 is fed. The housing part 11 contains one Valve passage 13 with an annular valve seat surface 14, which cooperates with an associated valve member 15, the one of the valve seat surface 14 associated ring surface 16 having. The valve member 15 is in a conventional manner as is not shown further, at the lower end of an actuator in the form of a rod, a plunger, a shaft od.dergl. attached that in an appropriate housing is guided coaxially to the longitudinal center axis 9, usually an actuator on this actuator attacks, e.g. in the form of an electric actuator, e.g. from an electric motor or stepper motor or rotary magnets or the like. can exist.

Die Ringfläche 16 des Ventilgliedes 15 ist an einem axial überstehenden Ringbund 40 des Ventilgliedes 15 ausgebildet, der auf der Oberseite des Ventilgliedes 15 angeordnet ist.The annular surface 16 of the valve member 15 is axial on one protruding collar 40 of the valve member 15 is formed, which is arranged on the top of the valve member 15.

Die Ventilsitzfläche 14 ist auf der unteren Seite des Gehäuseteils 11 angeordnet, dem von unten her und in Richtung auf die Ventilsitzfläche 14 in Pfeilrichtung 12 das Abgas zuführbar ist. Das Ventilglied 15 ist auf der Unterseite des Gehäuseteils 11 angeordnet und von unten her gegen die Ventilsitzfläche 14 zur Herbeiführung der in Fig. 1 gezeigten Schließstellung anlegbar.The valve seat surface 14 is on the lower side of the Housing part 11 arranged, the bottom and in Direction of valve seat surface 14 in the direction of arrow 12 the exhaust gas can be supplied. The valve member 15 is on the Bottom of the housing part 11 arranged and from below against the valve seat surface 14 to bring about the in Fig. 1 shown closed position can be applied.

Die unterseitige Ventilsitzfläche 14 ist als Schrägfläche 44 ausgebildet, die sich in der dem Ventilglied 15 abgewandten Axialrichtung etwa kegelstumpfförmig verjüngt.The valve seat surface 14 on the underside is an inclined surface 44 formed, which face away from the valve member 15 Axial direction tapered approximately frustoconical.

Die oberseitig des Ringbundes 40 ausgebildete Ringfläche 16 des Ventilgliedes 15 ist ebenfalls als Schrägfläche 46 ausgebildet, die sich in der der Ventilsitzfläche 14 zugewandten Axialrichtung etwa kegelstumpfförmig verjüngt. Der Kegelwinkel der Schrägflächen 44 und 46 ist gemäß Fig. 1 und 2 gleich groß gewählt und liegt in der Größenordnung von etwa 120°.The ring surface 16 formed on the upper side of the ring collar 40 of the valve member 15 is also an inclined surface 46 formed in the valve seat 14 facing Axial direction tapered approximately frustoconical. The taper angle of the inclined surfaces 44 and 46 is according to FIG. 1 and 2 are of equal size and are of the order of magnitude about 120 °.

Wie insbesondere die vergrößerte Darstellung in Fig. 2 erkennen läßt, schließt die Ringfläche 16, insbesondere in der Ausbildung als Schrägfläche 46, des Ringbundes 40 mit ihrem Außendurchmesser und auch mit ihrem Innendurchmesser jeweils im wesentlichen mit dem entsprechenden Außendurchmesser bzw. Innendurchmesser der als Schrägfläche 44 ausgebildeten Ventilsitzfläche 14 ab. As in particular the enlarged representation in FIG. 2 reveals, closes the annular surface 16, in particular in the training as an inclined surface 46, the collar 40 with their outside diameter and also with their inside diameter each essentially with the corresponding outer diameter or inner diameter of the inclined surface 44 Valve seat 14 from.

Der überstehende Ringbund 40 ist radial außen von einer zur Längsmittelachse 9 etwa koaxialen äußeren Zylinderfläche 48 begrenzt.The projecting collar 40 is radially outside of one to the longitudinal center axis 9 approximately coaxial outer cylinder surface 48 limited.

Die als Schrägfläche 44 ausgebildete Ventilsitzfläche 14 ist radial innen von einer zur Längsmittelachse 9 etwa koaxialen inneren Zylinderfläche 47 begrenzt, die den Ventildurchlaß 13 umgibt und definiert.The valve seat surface 14 designed as an inclined surface 44 is approximately radially inward from one to the longitudinal central axis 9 limited coaxial inner cylinder surface 47 which the Valve passage 13 surrounds and defines.

Die Ventilsitzfläche 14 des Gehäuseteils 11 ist an einem im Querschnitt relativ dünnen, etwa scheibenförmigen Kopfbereich 49 des Gehäuseteils 11 ausgebildet.The valve seat surface 14 of the housing part 11 is on one relatively thin in cross section, approximately disc-shaped Head area 49 of the housing part 11 is formed.

An die als Schrägfläche 44 ausgebildete Ventilsitzfläche 14 schließt sich radial außen eine Ringfläche 45 an, die innerhalb einer Radialebene liegt, die etwa rechtwinklig zur Längsmittelachse 9 ausgerichtet ist. Die Oberseite des Kopfbereiches 49 ist durch eine zu dieser Ringfläche 45 etwa parallele Kopffläche 50 begrenzt.On the valve seat surface 14 designed as an inclined surface 44 adjoins an annular surface 45 radially on the outside lies within a radial plane that is approximately rectangular is aligned with the longitudinal central axis 9. The top of the Head area 49 is through a to this annular surface 45th approximately parallel head surface 50 limited.

Der Ventilkörper 15 weist auf seiner der Ventilsitzfläche 14 zugewandten Oberseite 51 eine oder mehrere vertieft gelegene, nach oben offene Aufnahmen 52 als Sammelräume auf, in denen sich Flüssigkeit, Kondensat und/oder Partikel sammeln können, die insbesondere bei Abkühlung des Abgasrückführventils 10 aus dem Abgas, insbesondere aus Diesel-Abgas, ausfallen können. Die mindestens eine Aufnahme 52 nimmt derartige Partikel, Flüssigkeiten od.dergl. auf, so daß diese von den miteinander wirkenden Schrägflächen 44 und 46 soweit wie möglich ferngehalten werden.The valve body 15 has on the valve seat surface 14 facing top 51 one or more recessed open, upwardly open receptacles 52 as collecting spaces, in which there is liquid, condensate and / or particles can collect, especially when the exhaust gas recirculation valve cools down 10 from the exhaust gas, in particular from diesel exhaust gas, can fail. The at least one receptacle 52 takes such particles, liquids or the like. on, so that these from the inclined surfaces interacting 44 and 46 should be kept as far as possible.

Beim gezeigten Ausführungsbeispiel gemäß Fig. 1 und 2 weist der Ventilkörper 15 oberseitig als vertieft gelegene Aufnahme 52 zumindest eine vertiefte Ringnut auf, die z.B. eine Breite von etwa 2 mm bis 3 mm besitzt und die radial außen durch den axial hochragenden Ringbund 40 begrenzt ist. Radial innen schließt sich an die mindestens eine oberseitige Aufnahme 52, insbesondere Ringnut, eine zur Längsmittelachse 9 hin ansteigende Kegelfläche 53 an, die sich in Richtung zur Ventilsitzfläche 14 hin etwa kegelstumpfförmig verjüngt und axial über den Ringbund 40 und die Ringfläche 16 hinaus nach oben vorsteht. Das axiale überstandsmaß der Kegelfläche 53 liegt z.B. in der Größenordnung von 2 mm.In the embodiment shown in FIGS. 1 and 2 has the valve body 15 on the upper side as recessed Receptacle 52 at least one recessed annular groove, which e.g. has a width of about 2 mm to 3 mm and the radially outside through the axially projecting ring collar 40 is limited. Radially inside connects to the least a top receptacle 52, in particular an annular groove, one for Longitudinal central axis 9 rising conical surface 53, the approximately frustoconical in the direction of the valve seat surface 14 tapered and axially over the collar 40 and the Ring surface 16 also protrudes upwards. The axial projection dimension the conical surface 53 lies e.g. in the order of magnitude of 2 mm.

Durch diese Ausbildung des Abgasrückführventils 10 gemäß Fig. 1 und 2 ist mit einfachen Mitteln eine einwandfreie Schließfunktion bzw. Öffnungsfunktion zwischen der Ventilsitzfläche 14 und dem Ventilglied 15 gewährleistet, wobei eine Ansammlung von Partikeln, Flüssigkeit, Kondensat od.dergl., die beim Kühlen aus dem Abgas ausfallen, im Bereich der miteinander wirkenden Schrägflächen 44 und 46 soweit wie möglich ausgeschlossen ist.This configuration of the exhaust gas recirculation valve 10 according to 1 and 2 is a flawless with simple means Closing function or opening function between the valve seat surface 14 and the valve member 15 ensures that an accumulation of particles, liquid, condensate or the like, which fail during cooling from the exhaust gas, in Area of the inclined surfaces 44 and 46 acting with one another as far as possible is excluded.

Bei dem in Fig. 3 gezeigten zweiten Ausführungsbeispiel sind für die Teile, die dem ersten Ausführungsbeispiel in Fig. 1 und 2 entsprechen, gleiche Bezugszeichen verwendet, so daß dadurch zur Vermeidung von Wiederholungen auf die Beschreibung des ersten Ausführungsbeispieles Bezug genommen ist.3 are in the second embodiment for the parts that correspond to the first exemplary embodiment in FIG. 1 and 2 correspond to the same reference numerals, so that thereby avoiding repetitions on the Description of the first embodiment referred is.

Beim zweiten Ausführungsbeispiel ist der axial überstehende Ringbund 40 des Ventilgliedes 15 als Schneide 60 ausgebildet, die auf die Ventilsitzfläche 14 gerichtet ist. Die Ventilsitzfläche 14 ist als ebene Fläche ausgebildet, die sich innerhalb einer zur Längsmittelachse des Ventildurchlasses 13 etwa rechtwinkligen Radialebene erstreckt.In the second embodiment, the axially protruding Annular collar 40 of valve member 15 as cutting edge 60 formed, which is directed to the valve seat surface 14. The valve seat surface 14 is designed as a flat surface, which are within a to the longitudinal central axis of the valve passage 13 extends approximately rectangular radial plane.

Die Schneide 60 ist radial außen von der zur Längsmittelachse des Ventildurchlasses 13 etwa koaxialen äußeren Zylinderfläche 48 und radial innen von einer Innenschrägfläche 61 definiert, die sich unter Bildung der Schneide 60 in der sich als Ringlinie darstellenden Ringfläche 16 treffen. Die Innenschrägfläche 61 verjüngt sich in der Axialrichtung etwa kegelstumpfförmig, die der ebenen Ventilsitzfläche 14 abgewandt ist. Auch bei diesem Ausführungsbeispiel weist das Ventilglied 15 wie beim ersten Ausführungsbeispiel oberseitig zumindest eine vertieft gelegene, nach oben offene Aufnahme entsprechend der Aufnahme 52 auf. Durch die Schneide 60 ist die Größe der in Schließstellung gemäß Fig. 3 in Berührung miteinander gelangenden Flächen so gering wie möglich gehalten, so daß etwaige dazwischen haftende Partikel, Flüssigkeiten, Kondensat od.dergl., die bei Aushärtung etwa ein Verkleben der Kontaktflächen zur Folge haben könnten, praktisch keinen Flächenansatz haben. Im übrigen ist aufgrund der durch die Schneide 60 erreichten Scharfkantigkeit eine scharfe Abrißkante radial nach innen in Form der Innenschrägfläche 61 und radial nach außen in Form der äußeren Zylinderfläche 48 geschaffen, durch die ein Abreißen etwaiger Ansammlungen gefördert wird. Aufgrund der Ausbildung als Schneide 60 kann diese im übrigen bei der Überführung des Ventilgliedes 15 jeweils in die Schließstellung gemäß Fig. 3 etwaige Ansammlungen, die an der Ventilsitzfläche 14 haften sollten, einschneiden und aufbrechen, so daß diese damit von der Ventilsitzfläche 14 abgelöst werden.The cutting edge 60 is radially outward from that to the longitudinal central axis the valve passage 13 approximately coaxial outer Cylinder surface 48 and radially inward from an inner bevel surface 61 that defines itself with the formation of the cutting edge 60 in the ring surface 16, which presents itself as a ring line to meet. The inner inclined surface 61 tapers in the Axial direction approximately frustoconical, that of the flat valve seat 14 is turned away. Also in this embodiment has the valve member 15 as in the first embodiment at least one recessed top, upward open image corresponding to the image 52 on. By the cutting edge 60 is the size in the closed position 3 in contact with each other Areas kept as small as possible so that any particles, liquids, condensate sticking in between or the like, which, when cured, is about sticking together Could result in contact surfaces, practically none Have area approach. Incidentally, due to the by Cutting edge 60 reached a sharp tear-off edge radially inward in the form of the inner inclined surface 61 and radially outward in the form of the outer cylinder surface 48 created by tearing off any accumulations is promoted. Due to the training as a cutting edge 60 this, moreover, during the transfer of the valve member 15 any accumulations in the closed position according to FIG. 3, that should adhere to the valve seat surface 14, cut and break open, so that this of the Valve seat 14 are detached.

Bei einem anderen, nicht gezeigten Ausführungsbeispiel ist die Schneide 60 im Bereich der Ventilsitzfläche 14 ausgebildet, wobei dann die ventilgliedseitige Ringfläche 16 z.B. als ebene Ringfläche gestaltet sein kann.In another embodiment, not shown the cutting edge 60 is formed in the region of the valve seat surface 14, the annular member 16 on the valve member side then e.g. can be designed as a flat ring surface.

Bei dem in Fig. 4 gezeigten dritten Ausführungsbeispiel sind für gleiche Teile gleiche Bezugszeichen wie in den vorangehenden Ausführungsbeispielen verwendet, so daß dadurch auf die Beschreibung dieser Bezug genommen ist. In the third embodiment shown in FIG. 4 the same reference numerals for the same parts as in the preceding Embodiments used, so that on the description of this reference is taken.

Beim dritten Ausführungsbeispiel ist die Schneide 60 radial innen von einer zur Längsmittelachse des Ventildurchlasses 13 etwa koaxialen inneren Zylinderfläche 62 und radial außen von einer Außenschrägfläche 63 definiert, die sich zur Bildung der Schneide 60 treffen, wobei sich die Ringfläche 16 wiederum als Kreis darstellt. Die Außenschrägfläche 63 verjüngt sich etwa kegelstumpfförmig in der Axialrichtung, die der ebenen Ventilsitzfläche 14 zugewandt ist. Durch diese Gestaltung gemäß Fig. 4 werden die gleichen Vorteile wie durch diejenige in Fig. 3 erzielt.In the third exemplary embodiment, the cutting edge is 60 radially inward from one to the longitudinal central axis of the valve passage 13 approximately coaxial inner cylinder surface 62 and defined radially on the outside by an outer inclined surface 63, which meet to form the cutting edge 60, the Ring surface 16 in turn represents a circle. The outer bevel 63 tapers in the shape of a truncated cone Axial direction, which faces the flat valve seat surface 14 is. 4 are the same Advantages as achieved by that in Fig. 3.

Claims (27)

  1. Exhaust gas recirculation valve for internal combustion engines, which has, in a housing part (11), a valve throat (13) with a valve seat surface (14) and a valve element (15) with an annular surface (16), which is assigned to and faces the valve seat surface (14), on an axially upwardly projecting annular collar, characterized in that the annular surface (16) of the valve element (15) is formed on the end face at the axially projecting end of the annular collar (40) of the valve element (15).
  2. Exhaust gas recirculation valve according to Claim 1, characterized in that the valve seat surface (14) is arranged on the underside, which faces the valve element (15), of the housing part (11), to which it is possible to supply exhaust gas from below and in the direction of the valve seat surface (14).
  3. Exhaust gas recirculation valve according to Claim 2, characterized in that the valve element (15) is arranged on the underside of the housing part (11) and can be moved into contact with the valve seat surface (14) from below.
  4. Exhaust gas recirculation valve according to one of Claims 1 to 3, characterized in that the axially projecting annular collar (40) is arranged on the upper side, which faces the valve seat surface (14), of the valve element (15).
  5. Exhaust gas recirculation valve according to one of Claims 1 to 4, characterized in that the valve seat surface (14) is configured as an inclined surface (44), which tapers approximately frustoconically in the axial direction away from the valve element (15).
  6. Exhaust gas recirculation valve according to Claim 5, characterized in that the cone angle of the frustoconical inclined surface (44) is in the order of magnitude of approximately 120°.
  7. Exhaust gas recirculation valve according to one of Claims 1 to 6, characterized in that the annular surface (16) of the valve element (15) is configured as an inclined surface (46), which tapers approximately frustoconically in the axial direction towards the valve seat surface (14).
  8. Exhaust gas recirculation valve according to Claim 7, characterized in that the cone angle of the frustoconical inclined surface (46) of the valve element (15) corresponds to the cone angle of the valve seat surface (14) which is configured as a frustoconical inclined surface (44).
  9. Exhaust gas recirculation valve according to one of Claims 1 to 8, characterized in that the outer diameter and/or the inner diameter of the annular surface (16), in particular inclined surface (46), of the projecting annular collar (40) in each case at least substantially terminates with that of the valve seat surface (14) which is configured as an inclined surface (44).
  10. Exhaust gas recirculation valve according to one of Claims 1 to 9, characterized in that the projecting annular collar (40) is delimited radially on the outside by an outer cylindrical surface (48) which is approximately coaxial to the longitudinal central axis (9) of the valve throat (13).
  11. Exhaust gas recirculation valve according to one of Claims 1 to 10, characterized in that the valve seat surface (14) of the housing part (11) is configured on a head region (49) of the housing part (11), the said head region (49) having a thin cross section, for example in the shape of a disc.
  12. Exhaust gas recirculation valve according to one of Claims 1 to 11, characterized in that the valve seat surface (14), which is configured as an inclined surface (44), is delimited radially on the inside by an inner cylindrical surface (47) which is approximately coaxial to the longitudinal central axis (9) of the valve throat (13) and surrounds the valve throat (13).
  13. Exhaust gas recirculation valve according to one of Claims 1 to 12, characterized in that the valve seat surface (14), which is configured as an inclined surface (44), is adjoined radially on the outside by an annular surface (45), which extends within a radial plane which is aligned approximately at right angles to the longitudinal central axis (9) of the valve throat (13).
  14. Exhaust gas recirculation valve according to one of Claims 1 to 13, characterized in that the valve member (15) has, on its upper side (51), one or more recessed receptacles (52), open at the top, as collecting space.
  15. Exhaust gas recirculation valve according to Claim 14, characterized in that the valve element (15) has at least one recessed annular groove as recessed receptacles (52).
  16. Exhaust gas recirculation valve according to Claim 15, characterized in that the width of the annular groove is approximately 2 - 3 mm.
  17. Exhaust gas recirculation valve according to one of Claims 14 to 16, characterized in that the at least one receptacle (52), in particular annular groove, of the valve element (15) is delimited radially on the outside by the axially upwardly projecting annular collar (40).
  18. Exhaust gas recirculation valve according to one of Claims 14 to 17, characterized in that the at least one receptacle (52), in particular annular groove, of the valve element (15) is adjoined radially on the inside by a conical surface (53) which rises towards the longitudinal central axis (9).
  19. Exhaust gas recirculation valve according to Claim 18, characterized in that the conical surface (53) tapers approximately frustoconically in the same axial direction as the valve seat surface (14) which is configured as an inclined surface (44).
  20. Exhaust gas recirculation valve according to Claim 18 or 19, characterized in that the conical surface (53) projects upwardly beyond the annular collar (40) and the annular surface (16) of the valve element (15) in the axial direction.
  21. Exhaust gas recirculation valve according to Claim 20, characterized in that the axial projecting length of the conical surface (53) is approximately in the order of magnitude of 2 mm.
  22. Exhaust gas recirculation valve according to one of Claims 1 to 21, characterized in that the annular surface at the axially projecting end of the annular collar (40) of the valve member (15) is reduced to a bezel (60), which is directed towards the valve seat surface (14).
  23. Exhaust gas recirculation valve according to Claim 22, characterized in that the valve seat surface (14) is configured as a planar surface, which extends within a radial plane approximately at right angles to the longitudinal central axis (9) of the valve throat (13).
  24. Exhaust gas recirculation valve according to Claim 22 or 23, characterized in that the bezel (60) is formed radially on the outside by the outer cylindrical surface (48), which is approximately coaxial to the longitudinal central axis (9) of the valve throat (13), and radially on the inside by an inner inclined surface (61), which surfaces meet and form the annular surface (16).
  25. Exhaust gas recirculation valve according to Claim 24, characterized in that the inner inclined surface (61) tapers approximately frustoconically in an axial direction away from the valve seat surface (14).
  26. Exhaust gas recirculation valve according to Claim 22 or 23, characterized in that the bezel (60) is formed radially on the inside by an inner cylindrical surface (62), which is approximately coaxial to the longitudinal central axis (9) of the valve throat (13), and radially on the outside by an outer inclined surface (63), which surfaces meet and form the annular surface (16).
  27. Exhaust gas recirculation valve according to Claim 26, characterized in that the outer inclined surface (63) tapers approximately frustoconically in an axial direction towards the valve seat surface (14).
EP99110259A 1998-06-09 1999-05-27 Exhaust gas recirculation valve for combustion engines Expired - Lifetime EP0964147B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19825656 1998-06-09
DE19825656A DE19825656A1 (en) 1998-06-09 1998-06-09 Exhaust gas recirculation valve for internal combustion engines

Publications (3)

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EP0964147A2 EP0964147A2 (en) 1999-12-15
EP0964147A3 EP0964147A3 (en) 2000-10-18
EP0964147B1 true EP0964147B1 (en) 2003-11-12

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EP99110259A Expired - Lifetime EP0964147B1 (en) 1998-06-09 1999-05-27 Exhaust gas recirculation valve for combustion engines

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DE (2) DE19825656A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10044780A1 (en) * 2000-09-09 2002-04-04 Wahler Gmbh & Co Kg Gustav Control device with a control flap for controlling a medium
DE10104227C1 (en) * 2001-01-31 2003-01-16 Bosch Gmbh Robert Gas flow mixing device, for mixing gas flows supplied at different temperatures, has cooling device for one gas flow combined in common housing with mixing valve
DE10108043B4 (en) * 2001-02-20 2005-09-01 Robert Bosch Gmbh Self-cleaning valves in the supply air or exhaust system in internal combustion engines

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03267563A (en) * 1990-03-16 1991-11-28 Taiho Kogyo Co Ltd Exhaust gas recirculation device
DE4009923C2 (en) * 1990-03-28 1995-11-02 Fev Motorentech Gmbh & Co Kg Valve for metering the exhaust gas recirculation flow in internal combustion engines
JPH08135520A (en) * 1994-11-14 1996-05-28 Fuji Oozx Inc Exhaust gas reflux control valve device for internal combustion engine
DE19539921C1 (en) * 1995-10-26 1997-02-27 Ranco Inc Exhaust-gas recirculation valve
DE19607810A1 (en) 1996-03-01 1997-09-04 Bosch Gmbh Robert Exhaust gas recycling valve for IC engine
JPH09264203A (en) * 1996-03-28 1997-10-07 Aisan Ind Co Ltd Exhaust gas recirculation device
DE19701239A1 (en) * 1997-01-16 1998-07-23 Bosch Gmbh Robert Exhaust gas recirculation valve for motor vehicle internal combustion engine
DE19711199A1 (en) * 1997-03-19 1998-09-24 Wahler Gmbh & Co Gustav Exhaust gas recirculation valve for an internal combustion engine
JP3940862B2 (en) * 1997-06-25 2007-07-04 株式会社デンソー Exhaust gas recirculation control valve

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EP0964147A3 (en) 2000-10-18
DE19825656A1 (en) 1999-12-16
DE59907686D1 (en) 2003-12-18
EP0964147A2 (en) 1999-12-15

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