EP3159530A1 - Nozzle assembly for a fuel injection valve for injecting a gaseous and/or liquid fuel, fuel injection valve - Google Patents

Nozzle assembly for a fuel injection valve for injecting a gaseous and/or liquid fuel, fuel injection valve Download PDF

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Publication number
EP3159530A1
EP3159530A1 EP16184447.7A EP16184447A EP3159530A1 EP 3159530 A1 EP3159530 A1 EP 3159530A1 EP 16184447 A EP16184447 A EP 16184447A EP 3159530 A1 EP3159530 A1 EP 3159530A1
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EP
European Patent Office
Prior art keywords
injection valve
valve member
nozzle assembly
fuel
nozzle body
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Granted
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EP16184447.7A
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German (de)
French (fr)
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EP3159530B1 (en
Inventor
Jochen Wessner
Martin Katz
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention also relates to a fuel injector for injecting a gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine having such a nozzle assembly.
  • fuel injectors are also known as dual fuel injectors or dual fuel injectors.
  • a dual fuel injector is known that is capable of selectively injecting two different fuels, such as diesel and liquefied natural gas.
  • the two-fuel injector comprises a first and a second valve needle.
  • the first valve needle on the lifting movement of the first injection holes are releasable and closable, is guided in the second valve needle liftable.
  • the second valve needle is designed for this purpose as a hollow needle.
  • About the second valve needle more spray holes are releasable or closed. All spray holes are formed in a nozzle body which surrounds the valve needles and at the same time forms a sealing seat for the two valve needles.
  • a fuel separator in the form of a sleeve is provided between the two valve needles, which is biased in the axial direction against the nozzle body. Furthermore, the injector has a hydraulic locking arrangement which is intended to counteract mixing. A minimal mixing takes place nevertheless.
  • the present invention has for its object to provide a nozzle assembly for a fuel injection valve for injecting a gaseous and / or a liquid fuel, by means of which can be represented different injection geometries in a simple manner. Furthermore, the nozzle assembly is to ensure a secure media separation.
  • the nozzle assembly is proposed with the features of claim 1. Advantageous developments of the invention can be found in the dependent claims. Further, a fuel injection valve is provided with such a nozzle assembly.
  • the nozzle assembly proposed for a fuel injection valve for injecting a gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine comprises a needle-shaped first injection valve member which is designed to release and close at least one injection hole through which the liquid fuel can be injected in an at least partially hollow needle second injection valve member is guided in a liftable manner, wherein the second injection valve member has the outer peripheral side a sealing contour which cooperates with a sealing seat which is formed in a nozzle body surrounding the second injection valve member at least partially.
  • the nozzle body has a central opening, via which the gaseous fuel can be injected in relation to the nozzle body as a function of the axial position of the second injection valve member.
  • the central opening of the nozzle body is releasable and closable via the second injection valve member.
  • the release is preferably limited to a remaining between the second injection valve member and the nozzle body free opening cross-section through which the gaseous fuel is injectable.
  • the gaseous fuel is therefore - in contrast to the liquid fuel - not introduced via at least one injection hole in the combustion chamber of the internal combustion engine. This reduces the number of spray holes, resulting in a simplification of the production result.
  • a defined injection geometry can be specified via the specific design of the opening-limiting surfaces.
  • the freedom of design is significantly greater here than in a simple spray hole.
  • Both stroke-dependent and stroke-independent injection geometries can be realized.
  • the respective injection geometry can influence the spray pattern of the gaseous fuel. For example, the penetration depth of the gaseous fuel can be varied via the spray angle. This can lead to the combustion air in the combustion chamber being better utilized.
  • the sealing contour of the second injection valve member is arranged on the outer peripheral side, the gaseous fuel is guided radially outward with respect to the second injection valve member.
  • the flow path of the liquid fuel is in contrast inside the second injection valve member. In this way, a secure media separation is effected at the same time.
  • an end portion of the second injection valve member is guided through the central opening of the nozzle body.
  • the opening is therefore bounded radially inwardly by the end portion of the second injection valve member.
  • the remaining between the injection valve member and the nozzle body free opening cross section may thus be annular, so that the gaseous fuel is injected over the entire circumference.
  • the guided through the opening end portion of the second injection valve member preferably forms a kind of cap, so that the at least partially formed as a hollow needle second injection valve member front, d. H. on the combustion chamber side, is closed.
  • the cap-like end of the second injection valve member assists effective media separation.
  • the second injection valve member has a flow-directing outer contour which extends over at least a partial circumferential area and which is arranged downstream of the sealing contour in the flow direction of the gaseous fuel. Opens the second injection valve member, the gaseous fuel via the nozzle body formed in the sealing seat of the flow-directing Outward contour of the injection valve member supplied and deflected accordingly.
  • the design of the outer contour concrete spraying angle can be specified.
  • the design of the outer contour may vary in the circumferential direction, so that the second injection valve member when opening no annular free opening cross section, but for example, only one or more sector-shaped free opening cross-sections releases. In this way, a variety of injection geometries can be realized.
  • the flow-guiding outer contour is preferably formed in a region of the end section of the second injection valve member which is guided through the central opening of the nozzle body and which lies opposite a control edge formed on the nozzle body.
  • the remaining between the second injection valve member and the nozzle body free opening cross section is therefore - depending on the stroke of the second injection valve member - variable. With increasing stroke of the second injection valve member, the free opening cross-section decreases. About the variable free opening cross-section rate shaping and a variation of the penetration depth of the gaseous fuel are particularly easy to represent.
  • the flow-guiding outer contour which extends over at least a partial circumferential area comprises at least one groove.
  • the groove serves as a gas collecting space and promotes a uniform discharge of the gaseous fuel into the combustion chamber.
  • the groove preferably has a rounded cross-section.
  • the groove may be formed as a circumferential annular groove with a constant or varying cross-section.
  • the groove is bounded in the circumferential direction by at least one flow-deflecting wall.
  • injection geometries can be realized via the at least one flow-deflecting wall, which leads to different spray angles in the circumferential direction.
  • the at least one injection hole, via which the liquid fuel can be injected is preferably formed in the second injection valve member.
  • the arrangement is preferably carried out in the region of the guided through the central opening of the nozzle body end portion of the second injection valve member, in the region of the cap-like end. Accordingly, the openings or geometries which determine the respective spray pattern of the two fuels are all formed on one component, specifically on the second injection valve member. This simplifies the necessary coordination of the openings or geometries on each other.
  • a sealing seat for the first injection valve member is formed in the second injection valve member. This is also preferably conically shaped, so that the first injection valve member automatically undergoes a centering.
  • the sealing seat formed in the nozzle body for the second injection valve member is also conically shaped. It can be achieved in this way an automatic centering of the second injection valve member with respect to the nozzle body.
  • the in the Fig. 1 illustrated nozzle assembly comprises a nozzle body 7, which surrounds a first and a second injection valve member 2, 4 at least in sections.
  • the first injection valve member 2 is designed needle-shaped and received in a liftable manner in the second injection valve member 4.
  • the second injection valve member 4 is at least partially designed as a hollow needle for receiving the first injection valve member 2.
  • the liquid fuel is passed through an annular space 15 remaining between the first and second injection valve members 2, 4.
  • the gaseous fuel is passed through an annular space 16 remaining between the second injection valve member 4 and the nozzle body 7.
  • the second injection valve member 4 has an end portion 9, which is guided through an opening 8 of the nozzle body 7.
  • the end portion 9 is designed to be largely closed. In this way a secure media separation is effected.
  • the injection hole 3 is arranged downstream of a conically shaped sealing seat 13 for the first injection valve member 2, which is formed on the inner circumference side in the second injection valve member 4, in the flow direction of the liquid fuel.
  • the gaseous fuel is introduced into the combustion chamber 1 via a free opening cross-section which, depending on the stroke of the second injection valve member 4, remains between the second injection valve member 4 and the nozzle body 7. Opens the second injection valve member 4, gaseous fuel passes through a sealing seat 6 in an outer peripheral side at the end portion 9 of the second injection valve member 4 formed groove 11, which in the present case has a rounded cross section and thus causes a deflection of the gas flow.
  • a flow-guiding outer contour 10 which merges into a cooperating with the sealing seat 6 sealing contour 5.
  • a plurality of grooves 11 are formed in the end portion 9 of the second injection valve member 4, each extending over a partial circumferential area of the end portion 9.
  • the grooves 11 are bounded in the circumferential direction by walls 12, which are also flow-guiding (see Fig. 3 ). Between the grooves 11 remaining closed sections (see Fig. 2 ) limit the gas mass flow, since the opening 8 in this area, regardless of the stroke of the second injection valve member 4, remains closed.
  • an opening 8 limiting control edge 14 is provided on the nozzle body 7 (see Fig. 1 ). This causes the remaining between the injection valve member 4 and the nozzle body 7 remaining free opening cross-section decreases with progressive stroke of the second injection valve member 4.
  • For the control edge 14 is arranged at the level of the grooves 11 formed in the second injection valve member 4.
  • FIGS. 1 to 3 show only a preferred embodiment of the invention. Modifications are possible, which relate in particular to the specific design of the end portion 8 of the second injection valve member 4.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Die Erfindung betrifft eine Düsenbaugruppe für ein Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs in einen Brennraum (1) einer Brennkraftmaschine, umfassend ein nadelförmiges erstes Einspritzventilglied (2), das zum Freigeben und Verschließen mindestens eines Spritzlochs (3), über das der flüssige Brennstoff einspritzbar ist, in einem zumindest abschnittsweise als Hohlnadel ausgebildeten zweiten Einspritzventilglied (4) hubbeweglich geführt ist, wobei das zweite Einspritzventilglied (4) außenumfangseitig eine Dichtkontur (5) aufweist, die mit einem Dichtsitz (6) zusammenwirkt, der in einem das zweite Einspritzventilglied (4) zumindest abschnittsweise umgebenden Düsenkörper (7) ausgebildet ist. Erfindungsgemäß weist der Düsenkörper (7) eine zentrale Öffnung (8) auf, über die der gasförmige Brennstoff in Abhängigkeit von der axialen Lage des zweiten Einspritzventilglieds (4) in Bezug auf den Düsenkörper (7) einspritzbar ist. Ferner betrifft die Erfindung ein Brennstoffeinspritzventil mit einer solchen Düsenbaugruppe.The invention relates to a nozzle assembly for a fuel injection valve for injecting a gaseous and / or liquid fuel into a combustion chamber (1) of an internal combustion engine, comprising a needle-shaped first injection valve member (2) for releasing and closing at least one injection hole (3) via which liquid fuel is injectable, in a at least partially formed as a hollow needle second injection valve member (4) is guided in a liftable manner, wherein the second injection valve member (4) has a sealing contour (5) on the outer circumference, which cooperates with a sealing seat (6) in one the second Injection valve member (4) at least partially surrounding nozzle body (7) is formed. According to the invention, the nozzle body (7) has a central opening (8), via which the gaseous fuel can be injected in relation to the nozzle body (7) as a function of the axial position of the second injection valve member (4). Furthermore, the invention relates to a fuel injection valve with such a nozzle assembly.

Description

Die Erfindung betrifft eine Düsenbaugruppe für ein Brennstoffeinspritzventil mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ferner betrifft die Erfindung ein Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs in einen Brennraum einer Brennkraftmaschine mit einer solchen Düsenbaugruppe. Derartige Brennstoffeinspritzventile sind auch als Zweikraftstoffinjektoren oder Dual-Fuel-Injektoren bekannt.The invention also relates to a fuel injector for injecting a gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine having such a nozzle assembly. Such fuel injectors are also known as dual fuel injectors or dual fuel injectors.

Stand der TechnikState of the art

Aus der Offenlegungsschrift DE 10 2012 012 450 A1 ist beispielhaft ein Zweikraftstoffinjektor bekannt, der in der Lage ist, selektiv zwei unterschiedliche Kraftstoffe wie Diesel und Flüssigerdgas einzuspritzen. Hierzu umfasst der Zweikraftstoffinjektor eine erste und eine zweite Ventilnadel. Die erste Ventilnadel, über deren Hubbewegung erste Spritzlöcher freigebbar und verschließbar sind, ist in der zweiten Ventilnadel hubbeweglich geführt. Die zweite Ventilnadel ist hierzu als Hohlnadel ausgebildet. Über die zweite Ventilnadel sind weitere Spritzlöcher freigebbar bzw. verschließbar. Sämtliche Spritzlöcher sind in einem Düsenkörper ausgebildet, der die Ventilnadeln umgibt und zugleich jeweils einen Dichtsitz für die beiden Ventilnadeln ausbildet. Um die beiden Kraftstoffe voneinander zu trennen, ist zwischen den beiden Ventilnadeln ein Kraftstoffseparator in Form einer Hülse vorgesehen, die in axialer Richtung gegen den Düsenkörper vorgespannt ist. Ferner weist der Injektor eine Hydraulikverriegelungsanordnung auf, die einer Vermischung entgegen wirken soll. Eine minimale Vermischung findet dennoch statt.From the publication DE 10 2012 012 450 A1 By way of example, a dual fuel injector is known that is capable of selectively injecting two different fuels, such as diesel and liquefied natural gas. For this purpose, the two-fuel injector comprises a first and a second valve needle. The first valve needle, on the lifting movement of the first injection holes are releasable and closable, is guided in the second valve needle liftable. The second valve needle is designed for this purpose as a hollow needle. About the second valve needle more spray holes are releasable or closed. All spray holes are formed in a nozzle body which surrounds the valve needles and at the same time forms a sealing seat for the two valve needles. In order to separate the two fuels, a fuel separator in the form of a sleeve is provided between the two valve needles, which is biased in the axial direction against the nozzle body. Furthermore, the injector has a hydraulic locking arrangement which is intended to counteract mixing. A minimal mixing takes place nevertheless.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Düsenbaugruppe für ein Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder eines flüssigen Brennstoffs anzugeben, mittels welcher sich in einfacher Weise unterschiedliche Einspritzgeometrien darstellen lassen. Ferner soll die Düsenbaugruppe eine sichere Medientrennung gewährleisten.The present invention has for its object to provide a nozzle assembly for a fuel injection valve for injecting a gaseous and / or a liquid fuel, by means of which can be represented different injection geometries in a simple manner. Furthermore, the nozzle assembly is to ensure a secure media separation.

Zur Lösung der Aufgabe wird die Düsenbaugruppe mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen. Ferner wird ein Brennstoffeinspritzventil mit einer solchen Düsenbaugruppe angegeben.To solve the problem, the nozzle assembly is proposed with the features of claim 1. Advantageous developments of the invention can be found in the dependent claims. Further, a fuel injection valve is provided with such a nozzle assembly.

Offenbarung der ErfindungDisclosure of the invention

Die für ein Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs in einen Brennraum einer Brennkraftmaschine vorgeschlagene Düsenbaugruppe umfasst ein nadelförmiges erstes Einspritzventilglied, das zum Freigeben und Verschließen mindestens eines Spritzlochs, über das der flüssige Brennstoff einspritzbar ist, in einem zumindest abschnittsweise als Hohlnadel ausgebildeten zweiten Einspritzventilglied hubbeweglich geführt ist, wobei das zweite Einspritzventilglied außenumfangseitig eine Dichtkontur aufweist, die mit einem Dichtsitz zusammenwirkt, der in einem das zweite Einspritzventilglied zumindest abschnittsweise umgebenden Düsenkörper ausgebildet ist. Erfindungsgemäß weist der Düsenkörper eine zentrale Öffnung auf, über die der gasförmige Brennstoff in Abhängigkeit von der axialen Lage des zweiten Einspritzventilglieds in Bezug auf den Düsenkörper einspritzbar ist.The nozzle assembly proposed for a fuel injection valve for injecting a gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine comprises a needle-shaped first injection valve member which is designed to release and close at least one injection hole through which the liquid fuel can be injected in an at least partially hollow needle second injection valve member is guided in a liftable manner, wherein the second injection valve member has the outer peripheral side a sealing contour which cooperates with a sealing seat which is formed in a nozzle body surrounding the second injection valve member at least partially. According to the invention, the nozzle body has a central opening, via which the gaseous fuel can be injected in relation to the nozzle body as a function of the axial position of the second injection valve member.

Das heißt, dass die zentrale Öffnung des Düsenkörpers über das zweite Einspritzventilglied freigebbar und verschließbar ist. Die Freigabe beschränkt sich dabei bevorzugt auf einen zwischen dem zweiten Einspritzventilglied und dem Düsenkörper verbleibenden freien Öffnungsquerschnitt, über den der gasförmige Brennstoff einspritzbar ist.That is, the central opening of the nozzle body is releasable and closable via the second injection valve member. The release is preferably limited to a remaining between the second injection valve member and the nozzle body free opening cross-section through which the gaseous fuel is injectable.

Der gasförmige Brennstoff wird demnach - im Unterschied zum flüssigen Brennstoff - nicht über mindestens ein Spritzloch in den Brennraum der Brennkraftmaschine eingebracht. Dadurch reduziert sich die Anzahl der Spritzlöcher, was eine Vereinfachung der Fertigung zur Folge hat.The gaseous fuel is therefore - in contrast to the liquid fuel - not introduced via at least one injection hole in the combustion chamber of the internal combustion engine. This reduces the number of spray holes, resulting in a simplification of the production result.

Ferner kann über die konkrete Gestaltung der öffnungsbegrenzenden Flächen eine definierte Einspritzgeometrie vorgegeben werden. Der Gestaltungsfreiraum ist hier deutlich größer als bei einem einfachen Spritzloch. Dabei sind sowohl hubabhängige als auch hubunabhängige Einspritzgeometrien realisierbar. Über die jeweilige Einspritzgeometrie kann Einfluss auf das Spritzbild des gasförmigen Brennstoffs genommen werden. Beispielsweise kann über den Spritzwinkel die Eindringtiefe des gasförmigen Brennstoffs variiert werden. Dies kann dazu führen, dass die Verbrennungsluft im Brennraum besser ausgenutzt wird.Furthermore, a defined injection geometry can be specified via the specific design of the opening-limiting surfaces. The freedom of design is significantly greater here than in a simple spray hole. Both stroke-dependent and stroke-independent injection geometries can be realized. The respective injection geometry can influence the spray pattern of the gaseous fuel. For example, the penetration depth of the gaseous fuel can be varied via the spray angle. This can lead to the combustion air in the combustion chamber being better utilized.

Indem die Dichtkontur des zweiten Einspritzventilglieds außenumfangseitig angeordnet ist, wird der gasförmige Brennstoff radial außen in Bezug auf das zweite Einspritzventilglied geführt. Der Strömungspfad des flüssigen Kraftstoffs befindet sich demgegenüber im Inneren des zweiten Einspritzventilglieds. Auf diese Weise wird zugleich eine sichere Medientrennung bewirkt.By the sealing contour of the second injection valve member is arranged on the outer peripheral side, the gaseous fuel is guided radially outward with respect to the second injection valve member. The flow path of the liquid fuel is in contrast inside the second injection valve member. In this way, a secure media separation is effected at the same time.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist ein Endabschnitt des zweiten Einspritzventilglieds durch die zentrale Öffnung des Düsenkörpers geführt. Die Öffnung wird demnach radial innen durch den Endabschnitt des zweiten Einspritzventilglieds begrenzt. Der zwischen dem Einspritzventilglied und dem Düsenkörper verbleibende freie Öffnungsquerschnitt kann somit ringförmig ausgebildet sein, so dass der gasförmige Brennstoff über den gesamten Umfang eingespritzt wird.According to a preferred embodiment of the invention, an end portion of the second injection valve member is guided through the central opening of the nozzle body. The opening is therefore bounded radially inwardly by the end portion of the second injection valve member. The remaining between the injection valve member and the nozzle body free opening cross section may thus be annular, so that the gaseous fuel is injected over the entire circumference.

Der durch die Öffnung geführte Endabschnitt des zweiten Einspritzventilglieds bildet vorzugsweise eine Art Kappe aus, so dass das zumindest abschnittsweise als Hohlnadel ausgebildete zweite Einspritzventilglied vorne, d. h. brennraumseitig, geschlossen ist. Das kappenartige Ende des zweiten Einspritzventilglieds unterstützt eine wirksame Medientrennung.The guided through the opening end portion of the second injection valve member preferably forms a kind of cap, so that the at least partially formed as a hollow needle second injection valve member front, d. H. on the combustion chamber side, is closed. The cap-like end of the second injection valve member assists effective media separation.

In Weiterbildung der Erfindung wird vorgeschlagen, dass das zweite Einspritzventilglied eine sich zumindest über einen Teilumfangsbereich ersteckende, strömungslenkende Außenkontur aufweist, die in Strömungsrichtung des gasförmigen Brennstoffs stromabwärts der Dichtkontur angeordnet ist. Öffnet das zweite Einspritzventilglied, wird der gasförmige Brennstoff über den im Düsenkörper ausgebildeten Dichtsitz der strömungslenkenden Außenkontur des Einspritzventilglieds zugeführt und entsprechend umgelenkt. Über die Gestaltung der Außenkontur können demnach konkrete Spritzwinkel vorgegeben werden.In a further development of the invention, it is proposed that the second injection valve member has a flow-directing outer contour which extends over at least a partial circumferential area and which is arranged downstream of the sealing contour in the flow direction of the gaseous fuel. Opens the second injection valve member, the gaseous fuel via the nozzle body formed in the sealing seat of the flow-directing Outward contour of the injection valve member supplied and deflected accordingly. According to the design of the outer contour concrete spraying angle can be specified.

Die Gestaltung der Außenkontur kann in Umfangsrichtung variieren, so dass das zweite Einspritzventilglied beim Öffnen keinen ringförmigen freien Öffnungsquerschnitt, sondern beispielsweise nur noch einen oder mehrere sektorförmige freie Öffnungsquerschnitte freigibt. Auf diese Weise ist eine Vielzahl an Einspritzgeometrien realisierbar.The design of the outer contour may vary in the circumferential direction, so that the second injection valve member when opening no annular free opening cross section, but for example, only one or more sector-shaped free opening cross-sections releases. In this way, a variety of injection geometries can be realized.

Vorzugsweise ist die strömungslenkende Außenkontur in einem Bereich des durch die zentrale Öffnung des Düsenkörpers geführten Endabschnitts des zweiten Einspritzventilglieds ausgebildet, der einer am Düsenkörper ausgebildeten Steuerkante gegenüber liegt. Der zwischen dem zweiten Einspritzventilglied und dem Düsenkörper verbleibende freie Öffnungsquerschnitt ist demnach - in Abhängigkeit vom Hub des zweiten Einspritzventilglieds - variabel. Mit zunehmendem Hub des zweiten Einspritzventilglieds verringert sich der freie Öffnungsquerschnitt. Über den variablen freien Öffnungsquerschnitt sind eine Ratenformung und eine Variation der Eindringtiefe des gasförmigen Brennstoffs besonders einfach darstellbar.The flow-guiding outer contour is preferably formed in a region of the end section of the second injection valve member which is guided through the central opening of the nozzle body and which lies opposite a control edge formed on the nozzle body. The remaining between the second injection valve member and the nozzle body free opening cross section is therefore - depending on the stroke of the second injection valve member - variable. With increasing stroke of the second injection valve member, the free opening cross-section decreases. About the variable free opening cross-section rate shaping and a variation of the penetration depth of the gaseous fuel are particularly easy to represent.

Vorteilhafterweise umfasst die sich zumindest über einen Teilumfangsbereich ersteckende, strömungslenkende Außenkontur mindestens eine Nut. Die Nut dient als Gas-Sammelraum und fördert eine gleichmäßige Abgabe des gasförmigen Brennstoffs in den Brennraum. Zur Optimierung der Gasströmung weist die Nut bevorzugt einen gerundeten Querschnitt auf.Advantageously, the flow-guiding outer contour which extends over at least a partial circumferential area comprises at least one groove. The groove serves as a gas collecting space and promotes a uniform discharge of the gaseous fuel into the combustion chamber. To optimize the gas flow, the groove preferably has a rounded cross-section.

Die Nut kann als umlaufende Ringnut mit gleichbleibendem oder sich veränderndem Querschnitt ausgebildet sein. Um eine Nut zu schaffen, die sich nur über einen Teilumfangsbereich erstreckt, wird vorgeschlagen, dass die Nut in Umfangsrichtung durch mindestens eine strömungslenkende Wand begrenzt wird. Über die mindestens eine strömungslenkende Wand können insbesondere Einspritzgeometrien realisiert werden, die zu unterschiedlichen Spritzwinkeln in Umfangsrichtung führen.The groove may be formed as a circumferential annular groove with a constant or varying cross-section. In order to create a groove that extends only over a partial circumferential region, it is proposed that the groove is bounded in the circumferential direction by at least one flow-deflecting wall. In particular, injection geometries can be realized via the at least one flow-deflecting wall, which leads to different spray angles in the circumferential direction.

Des Weiteren bevorzugt ist im zweiten Einspritzventilglied das mindestens eine Spritzloch ausgebildet, über welches der flüssige Brennstoff einspritzbar ist. Die Anordnung erfolgt vorzugsweise im Bereich des durch die zentrale Öffnung des Düsenkörpers geführten Endabschnitts des zweiten Einspritzventilglieds, und zwar im Bereich des kappenartigen Endes. Die das jeweilige Spritzbild der beiden Brennstoffe bestimmenden Öffnungen bzw. Geometrien sind demnach allesamt an einem Bauteil ausgebildet, und zwar am zweiten Einspritzventilglied. Dadurch vereinfacht sich die erforderliche Abstimmung der Öffnungen bzw. Geometrien aufeinander.Furthermore, the at least one injection hole, via which the liquid fuel can be injected, is preferably formed in the second injection valve member. The arrangement is preferably carried out in the region of the guided through the central opening of the nozzle body end portion of the second injection valve member, in the region of the cap-like end. Accordingly, the openings or geometries which determine the respective spray pattern of the two fuels are all formed on one component, specifically on the second injection valve member. This simplifies the necessary coordination of the openings or geometries on each other.

Ferner bevorzugt ist im zweiten Einspritzventilglied, vorzugsweise im Bereich des Endabschnitts, ein Dichtsitz für das erste Einspritzventilglied ausbildet. Dieser ist weiterhin vorzugsweise konisch geformt, so dass das erste Einspritzventilglied automatisch eine Zentrierung erfährt.Further preferably, in the second injection valve member, preferably in the region of the end portion, a sealing seat for the first injection valve member is formed. This is also preferably conically shaped, so that the first injection valve member automatically undergoes a centering.

Vorteilhafterweise ist der im Düsenkörper für das zweite Einspritzventilglied ausgebildete Dichtsitz ebenfalls konisch geformt ist. Es kann auf diese Weise eine automatische Zentrierung des zweiten Einspritzventilglieds in Bezug auf den Düsenkörper erreicht werden.Advantageously, the sealing seat formed in the nozzle body for the second injection valve member is also conically shaped. It can be achieved in this way an automatic centering of the second injection valve member with respect to the nozzle body.

Da die Vorteile der Erfindung insbesondere bei einem Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs in einen Brennraum einer Brennkraftmaschine zum Tragen kommen, wird darüber hinaus ein solches Brennstoffeinspritzventil mit einer erfindungsgemäßen Düsenbaugruppe vorgeschlagen.Since the advantages of the invention, in particular in a fuel injection valve for injecting a gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine come to fruition, such a fuel injection valve is proposed with a nozzle assembly according to the invention.

Eine bevorzugte Ausführungsform einer erfindungsgemäßen Düsenbaugruppe wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen:

Fig. 1
einen ersten schematischen Längsschnitt durch die Düsenbaugruppe,
Fig. 2
den zweiten schematischen Längsschnitt, jedoch um 45° gedreht und
Fig. 3
einen schematischen Querschnitt durch die Düsenbaugruppe.
A preferred embodiment of a nozzle assembly according to the invention will be explained in more detail with reference to the accompanying drawings. These show:
Fig. 1
a first schematic longitudinal section through the nozzle assembly,
Fig. 2
the second schematic longitudinal section, but rotated by 45 ° and
Fig. 3
a schematic cross section through the nozzle assembly.

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Die in der Fig. 1 dargestellte Düsenbaugruppe umfasst einen Düsenkörper 7, der ein erstes und ein zweites Einspritzventilglied 2, 4 zumindest abschnittsweise umgibt. Das erste Einspritzventilglied 2 ist nadelförmig ausgeführt und im zweiten Einspritzventilglied 4 hubbeweglich aufgenommen. Das zweite Einspritzventilglied 4 ist zur Aufnahme des ersten Einspritzventilglieds 2 zumindest abschnittsweise als Hohlnadel ausgeführt. Der flüssige Brennstoff wird über einen zwischen dem ersten und dem zweiten Einspritzventilglied 2, 4 verbleibenden Ringraum 15 geführt. Der gasförmige Brennstoff wird über einen zwischen dem zweiten Einspritzventilglied 4 und dem Düsenkörper 7 verbleibenden Ringraum 16 geführt.The in the Fig. 1 illustrated nozzle assembly comprises a nozzle body 7, which surrounds a first and a second injection valve member 2, 4 at least in sections. The first injection valve member 2 is designed needle-shaped and received in a liftable manner in the second injection valve member 4. The second injection valve member 4 is at least partially designed as a hollow needle for receiving the first injection valve member 2. The liquid fuel is passed through an annular space 15 remaining between the first and second injection valve members 2, 4. The gaseous fuel is passed through an annular space 16 remaining between the second injection valve member 4 and the nozzle body 7.

Das zweite Einspritzventilglied 4 weist einen Endabschnitt 9 auf, der durch eine Öffnung 8 des Düsenkörpers 7 geführt ist. Der Endabschnitt 9 ist weitgehend geschlossen ausgeführt. Auf diese Weise wird eine sichere Medientrennung bewirkt. Über mindestens ein im Endabschnitt 9 ausgebildetes Spritzloch 3 ist der flüssige Brennstoff in einen Brennraum 1 einer Brennkraftmaschine einspritzbar. Das Spritzloch 3 ist - in Strömungsrichtung des flüssigen Brennstoffs - stromabwärts eines konisch geformten Dichtsitzes 13 für das erste Einspritzventilglied 2 angeordnet, der innenumfangseitig im zweiten Einspritzventilglied 4 ausgebildet ist.The second injection valve member 4 has an end portion 9, which is guided through an opening 8 of the nozzle body 7. The end portion 9 is designed to be largely closed. In this way a secure media separation is effected. Via at least one injection hole 3 formed in the end section 9, the liquid fuel can be injected into a combustion chamber 1 of an internal combustion engine. The injection hole 3 is arranged downstream of a conically shaped sealing seat 13 for the first injection valve member 2, which is formed on the inner circumference side in the second injection valve member 4, in the flow direction of the liquid fuel.

Der gasförmige Brennstoff wird im Unterschied zum flüssigen Brennstoff über einen freien Öffnungsquerschnitt in den Brennraum 1 eingebracht, der - in Abhängigkeit vom Hub des zweiten Einspritzventilglieds 4 - zwischen dem zweiten Einspritzventilglied 4 und dem Düsenkörper 7 verbleibt. Öffnet das zweite Einspritzventilglied 4, gelangt gasförmiger Brennstoff über einen Dichtsitz 6 in eine außenumfangseitig am Endabschnitt 9 des zweiten Einspritzventilglieds 4 ausgebildete Nut 11, die vorliegend einen gerundeten Querschnitt besitzt und somit eine Umlenkung des Gasstroms bewirkt. Zur Optimierung der Strömungsführung ist der Nut 11 eine strömungslenkende Außenkontur 10 vorgelagert, die in eine mit dem Dichtsitz 6 zusammenwirkende Dichtkontur 5 übergeht.In contrast to the liquid fuel, the gaseous fuel is introduced into the combustion chamber 1 via a free opening cross-section which, depending on the stroke of the second injection valve member 4, remains between the second injection valve member 4 and the nozzle body 7. Opens the second injection valve member 4, gaseous fuel passes through a sealing seat 6 in an outer peripheral side at the end portion 9 of the second injection valve member 4 formed groove 11, which in the present case has a rounded cross section and thus causes a deflection of the gas flow. To optimize the flow guidance of the groove 11 is upstream of a flow-guiding outer contour 10, which merges into a cooperating with the sealing seat 6 sealing contour 5.

Vorliegend sind im Endabschnitt 9 des zweiten Einspritzventilglieds 4 mehrere Nuten 11 ausgebildet, die sich jeweils über einen Teilumfangsbereich des Endabschnitts 9 erstrecken. Die Nuten 11 werden in Umfangsrichtung durch Wände 12 begrenzt, die ebenfalls strömungslenkend sind (siehe Fig. 3). Zwischen den Nuten 11 verbleibende geschlossene Abschnitte (siehe Fig. 2) begrenzen den Gasmassenstrom, da die Öffnung 8 in diesem Bereich, und zwar unabhängig vom Hub des zweiten Einspritzventilglieds 4, verschlossen bleibt.In the present case, a plurality of grooves 11 are formed in the end portion 9 of the second injection valve member 4, each extending over a partial circumferential area of the end portion 9. The grooves 11 are bounded in the circumferential direction by walls 12, which are also flow-guiding (see Fig. 3 ). Between the grooves 11 remaining closed sections (see Fig. 2 ) limit the gas mass flow, since the opening 8 in this area, regardless of the stroke of the second injection valve member 4, remains closed.

Um den Gasmassenstrom hubabhängig zu variieren, ist am Düsenkörper 7 eine die Öffnung 8 begrenzende Steuerkante 14 vorgesehen (siehe Fig. 1). Diese bewirkt, dass sich mit fortschreitendem Hub des zweiten Einspritzventilglieds 4 der zwischen dem Einspritzventilglied 4 und dem Düsenkörper 7 verbleibende freie Öffnungsquerschnitt verringert. Denn die Steuerkante 14 ist auf Höhe der im zweiten Einspritzventilglied 4 ausgebildeten Nuten 11 angeordnet.In order to vary the gas mass flow depending on the stroke, an opening 8 limiting control edge 14 is provided on the nozzle body 7 (see Fig. 1 ). This causes the remaining between the injection valve member 4 and the nozzle body 7 remaining free opening cross-section decreases with progressive stroke of the second injection valve member 4. For the control edge 14 is arranged at the level of the grooves 11 formed in the second injection valve member 4.

Die Figuren 1 bis 3 zeigen lediglich eine bevorzugte Ausführungsform der Erfindung. Abwandlungen sind möglich, die insbesondere die konkrete Ausbildung des Endabschnitts 8 des zweiten Einspritzventilglieds 4 betreffen.The FIGS. 1 to 3 show only a preferred embodiment of the invention. Modifications are possible, which relate in particular to the specific design of the end portion 8 of the second injection valve member 4.

Claims (9)

Düsenbaugruppe für ein Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs in einen Brennraum (1) einer Brennkraftmaschine, umfassend ein nadelförmiges erstes Einspritzventilglied (2), das zum Freigeben und Verschließen mindestens eines Spritzlochs (3), über das der flüssige Brennstoff einspritzbar ist, in einem zumindest abschnittsweise als Hohlnadel ausgebildeten zweiten Einspritzventilglied (4) hubbeweglich geführt ist, wobei das zweite Einspritzventilglied (4) außenumfangseitig eine Dichtkontur (5) aufweist, die mit einem Dichtsitz (6) zusammenwirkt, der in einem das zweite Einspritzventilglied (4) zumindest abschnittsweise umgebenden Düsenkörper (7) ausgebildet ist,
dadurch gekennzeichnet, dass der Düsenkörper (7) eine zentrale Öffnung (8) aufweist, über die der gasförmige Brennstoff in Abhängigkeit von der axialen Lage des zweiten Einspritzventilglieds (4) in Bezug auf den Düsenkörper (7) einspritzbar ist.A nozzle assembly for a fuel injector for injecting a gaseous and / or liquid fuel into a combustion chamber (1) of an internal combustion engine, comprising a needle-shaped first injection valve member (2) for releasing and closing at least one injection hole (3) through which the liquid fuel is injectable , in which the second injection valve member (4) has a sealing contour (5) on the outer circumference, which cooperates with a sealing seat (6) which is in a second injection valve member (4). at least partially surrounding nozzle body (7) is formed,
characterized in that the nozzle body (7) has a central opening (8) through which the gaseous fuel in dependence on the axial position of the second injection valve member (4) with respect to the nozzle body (7) can be injected. Düsenbaugruppe nach Anspruch 1,
dadurch gekennzeichnet, dass ein Endabschnitt (9) des zweiten Einspritzventilglieds (4) durch die zentrale Öffnung (8) des Düsenkörpers (7) geführt ist und diese radial innen begrenzt.Nozzle assembly according to claim 1,
characterized in that an end portion (9) of the second injection valve member (4) through the central opening (8) of the nozzle body (7) is guided and these bounded radially inward. Düsenbaugruppe nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass das zweite Einspritzventilglied (4) eine sich zumindest über einen Teilumfangsbereich ersteckende, strömungslenkende Außenkontur (10) aufweist, die in Strömungsrichtung des gasförmigen Brennstoffs stromabwärts der Dichtkontur (5) angeordnet ist, wobei vorzugsweise die strömungslenkende Außenkontur (10) in einem Bereich des Endabschnitts (9) des zweiten Einspritzventilglieds (4) ausgebildet ist, der einer am Düsenkörper (7) ausgebildeten Steuerkante (14) gegenüber liegt.Nozzle assembly according to claim 1 or 2,
characterized in that the second injection valve member (4) has a at least over a partial circumferential area ersteckende, flow-directing outer contour (10) which is arranged in the flow direction of the gaseous fuel downstream of the sealing contour (5), wherein preferably the flow-guiding outer contour (10) in one Region of the end portion (9) of the second injection valve member (4) is formed, which is opposite to a nozzle body (7) formed control edge (14). Düsenbaugruppe nach Anspruch 3,
dadurch gekennzeichnet, dass die sich zumindest über einen Teilumfangsbereich ersteckende, strömungslenkende Außenkontur (10) mindestens eine Nut (11) umfasst.Nozzle assembly according to claim 3,
characterized in that the ersteckende located at least over a partial circumferential region, flow directing outer contour (10) comprises at least one groove (11). Düsenbaugruppe nach Anspruch 3 oder 4,
dadurch gekennzeichnet, dass die Nut (11) in Umfangsrichtung durch mindestens eine strömungslenkende Wand (12) begrenzt wird.Nozzle assembly according to claim 3 or 4,
characterized in that the groove (11) is bounded in the circumferential direction by at least one flow-deflecting wall (12). Düsenbaugruppe nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass im zweiten Einspritzventilglied (4), vorzugsweise im Bereich des Endabschnitts (9), das mindestens eine Spritzloch (3) ausgebildet ist, über das der flüssige Brennstoff einspritzbar ist.Nozzle assembly according to one of the preceding claims,
characterized in that in the second injection valve member (4), preferably in the region of the end portion (9), the at least one injection hole (3) is formed, via which the liquid fuel can be injected. Düsenbaugruppe nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass im zweiten Einspritzventilglied (4), vorzugsweise im Bereich des Endabschnitts (9), ein Dichtsitz (13) für das erste Einspritzventilglied (2) ausbildet ist, der vorzugsweise konisch geformt ist.Nozzle assembly according to one of the preceding claims,
characterized in that in the second injection valve member (4), preferably in the region of the end portion (9), a sealing seat (13) for the first injection valve member (2) is formed, which is preferably conically shaped. Düsenbaugruppe nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der im Düsenkörper (7) für das zweite Einspritzventilglied (4) ausgebildete Dichtsitz (6) konisch geformt ist.Nozzle assembly according to one of the preceding claims,
characterized in that in the nozzle body (7) for the second injection valve member (4) formed sealing seat (6) is conically shaped. Brennstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Brennstoffs in einen Brennraum (1) einer Brennkraftmaschine mit einer Düsenbaugruppe nach einem der vorhergehenden Ansprüche.Fuel injection valve for injecting a gaseous and / or liquid fuel into a combustion chamber (1) of an internal combustion engine having a nozzle assembly according to one of the preceding claims.
EP16184447.7A 2015-10-20 2016-08-17 Nozzle assembly for a fuel injection valve for injecting a gaseous and/or liquid fuel, fuel injection valve Active EP3159530B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015220416.2A DE102015220416A1 (en) 2015-10-20 2015-10-20 A nozzle assembly for a fuel injector for injecting a gaseous and / or liquid fuel, fuel injector

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EP3159530B1 EP3159530B1 (en) 2018-06-13

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166749A (en) * 1984-02-08 1985-08-30 Mitsubishi Heavy Ind Ltd Fuel injection valve
US5458292A (en) * 1994-05-16 1995-10-17 General Electric Company Two-stage fuel injection nozzle
DE102012012450A1 (en) 2011-06-24 2012-12-27 Caterpillar Inc. Two-fuel injector for a common-rail system
WO2014186892A1 (en) * 2013-05-21 2014-11-27 Westport Power Inc. Fuel injector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166749A (en) * 1984-02-08 1985-08-30 Mitsubishi Heavy Ind Ltd Fuel injection valve
US5458292A (en) * 1994-05-16 1995-10-17 General Electric Company Two-stage fuel injection nozzle
DE102012012450A1 (en) 2011-06-24 2012-12-27 Caterpillar Inc. Two-fuel injector for a common-rail system
WO2014186892A1 (en) * 2013-05-21 2014-11-27 Westport Power Inc. Fuel injector

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EP3159530B1 (en) 2018-06-13

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