EP3173614A1 - Nozzle assembly for a fuel injector and fuel injector - Google Patents

Nozzle assembly for a fuel injector and fuel injector Download PDF

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Publication number
EP3173614A1
EP3173614A1 EP16192230.7A EP16192230A EP3173614A1 EP 3173614 A1 EP3173614 A1 EP 3173614A1 EP 16192230 A EP16192230 A EP 16192230A EP 3173614 A1 EP3173614 A1 EP 3173614A1
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EP
European Patent Office
Prior art keywords
nozzle
nozzle assembly
assembly according
hole
injection
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.)
Granted
Application number
EP16192230.7A
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German (de)
French (fr)
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EP3173614B1 (en
Inventor
Karsten Frank
Werner Teschner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3173614A1 publication Critical patent/EP3173614A1/en
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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/06—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1826—Discharge orifices having different sizes
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent

Definitions

  • the invention relates to a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly.
  • a fuel injection valve for internal combustion engines which comprises a longitudinally displaceably arranged in a pressure chamber of a valve body valve needle for controlling a fuel flow from the pressure chamber to injection valve openings formed in the valve body.
  • the valve needle has a valve sealing surface which cooperates with a conical valve seat formed in the valve body.
  • the valve needle has a valve needle tip, which projects into the closed position of the valve needle in a blind hole of the valve body, which adjoins the valve seat. The valve needle tip covers the injection openings formed in the valve body.
  • a single injection port is proposed in this document, which is arranged downstream of the valve needle tip and is therefore always supplied with fuel. It is also proposed to reduce the diameter of the individual injection opening with respect to the diameter of the remaining injection openings in order to prevent the individual injection opening from being supplied with more fuel than the remaining injection openings.
  • pilot injections In the combustion of diesel fuels can be counteracted by one or more pilot injections a pronounced combustion noise, which is also known as "diesel nailing" or “diesel blow".
  • pre-injections require an increased application effort, since quantities and distances of the individual pilot injections must be set for each engine operating point.
  • pilot injections lead to higher fuel consumption because they do not or only partially contribute to the formation of the torque to be generated.
  • the present invention is therefore based on the object of specifying a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, which enables low-noise combustion of the injected fuel at a reduced pre-injection quantity or when a pre-injection is dispensed with.
  • the nozzle assembly is proposed with the features of claim 1.
  • Advantageous developments of the invention can be found in the dependent claims.
  • a fuel injector is proposed with such a nozzle assembly.
  • the nozzle assembly proposed for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine comprises a nozzle body and a nozzle needle, which is received in a liftable manner for releasing and closing a plurality of injection holes in a central bore of the nozzle body.
  • the plurality of injection holes are arranged in a bolt circle and are based on a conical shaped sealing seat formed in the nozzle body or on a blind hole adjoining the sealing seat.
  • a spray hole of the bolt circle differs from the other spray holes of the bolt circle, all the same are formed, characterized in that it has a reduced flow cross-section, a flow cross-section extending to the combustion chamber or a reduced spray hole length.
  • a further spray hole is arranged upstream of the bolt circle, which has a reduced flow cross section with respect to the spray holes of the bolt circle.
  • only a single spray hole is smaller, shorter and / or conically widening formed to produce a single ignition in a defined region of the combustion chamber. In this way, the ignition can be limited locally to slow the lighting.
  • the injection holes forming the bolt circle can leave the sealing seat or the blind hole.
  • the nozzle can be designed as a seat hole nozzle or as a blind hole nozzle.
  • an injection hole outside the hole circle is provided with a reduced flow cross-section, at least this is arranged in the region of the sealing seat. Due to the arrangement of the further injection hole in the region of the sealing seat, an enlargement of the blind hole is not required. In this way, after reaching the nozzle needle via the blind hole into the combustion chamber reaching amount of fuel can be kept low.
  • the nozzle body preferably has a reduced wall thickness in the region of this spray hole.
  • the Wall thickness reduction can be realized in a simple manner during the erosion process for the production of the injection hole.
  • To reduce the wall thickness of the nozzle body in the region of the injection hole with reduced spray hole length may have an internally and / or externally disposed lowering.
  • the reduction can be shaped to optimize flow, in particular conical or spherical.
  • the nozzle needle preferably has a sealing contour cooperating with the sealing seat, which is conically shaped.
  • the cone angle can be chosen equal to that of the sealing seat or slightly larger to form an annular sealing contour that allows a safe closing.
  • the cone angle of the sealing seat can be, for example, 30 °, 60 °, 90 ° or 120 °.
  • the nozzle needle has an end section which projects into the blind hole in the closed position of the nozzle needle. In this way, the volume of the blind hole can be reduced, so that after closing the nozzle needle less fuel remains in the blind hole. This has the consequence that after closing the nozzle needle and less fuel passes through the blind hole in the combustion chamber. Because in this way into the combustion chamber reaching fuel is not sufficiently atomized and burns only incomplete, whereby the pollutant emissions rise.
  • the projecting into the blind hole end portion of the nozzle needle may be formed conical and / or peg-shaped. About a pin-shaped end portion, the volume of the blind hole can be reduced most clearly. Further, a flow guide can be effected via a pin-shaped end portion and / or a flow gap can be formed, which acts as a delay-throttling member at the beginning of the injection.
  • the end section of the nozzle needle preferably has at least one peripheral flattening in the form of a bevel.
  • the end portion of the nozzle needle is designed as a triflate.
  • Rate shaping can be generated at the beginning of the injection via the flow guide, the retarding restrictor and / or the contours, which further enhances the desired effect of slowly igniting the injection jets to avoid pronounced combustion noise.
  • a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine which comprises a nozzle assembly according to the invention.
  • the nozzle assembly allows a change in the mixture formation in a defined region of the combustion chamber, so that the ignition of the gas-fuel mixture is promoted in this area.
  • the result is an early combustion start in a localized area, which is accompanied by a slow ignition of the further injection jets. In this way combustion noise can be significantly reduced.
  • the in the Fig. 1 illustrated nozzle assembly comprises a nozzle body 2 with a central bore 5, in which a nozzle needle 3 is received liftable.
  • spray holes 4 are releasable or closable, which are arranged in a circular plane in a radial plane and form a bolt circle.
  • the nozzle needle 3 has a conically shaped sealing contour 9, which cooperates with a conically shaped sealing seat 6 of the nozzle body 2. Since the injection holes 4 are arranged in the region of a blind hole 7 adjoining the sealing seat 6, they are not closed directly by the nozzle needle 3, but only the fuel supply in the direction of the injection holes 4 is interrupted. To release the spray holes, the nozzle needle 3 must be lifted out of the sealing seat 6. The required Aktorik is in the Fig. 1 not shown.
  • the blind hole 7 is formed in an end tip 12 of the nozzle body 2.
  • the nozzle needle 3 has an adjoining the sealing contour 9 end portion 10 which dips into the blind hole 7. As a result, the volume of the blind hole 7 is reduced.
  • the end portion 10 is conically shaped, wherein the cone angle is greater than the cone angle of the sealing contour 9 is selected.
  • high-pressure fuel flows out of the bore 5 in the direction of the injection holes 4 arranged in the region of the blind hole 7.
  • the high-pressure fuel is then injected into a combustion chamber 1 via the injection holes 4. Since a spray hole 4 'of the hole circle forming injection holes 4 has a reduced flow cross-section, the fuel injected over this is atomized particularly fine when entering the combustion chamber 1. This has the consequence that it ignites earlier and serves as a source of ignition for the fuel or the gas-fuel mixture, which is generated via the further injection holes 4.
  • the individual ignition in a defined region of the combustion chamber 1 leads to a staggered lighting of the injection jets introduced into the combustion chamber 1 via the further injection holes 4, so that the combustion is accompanied by a lower noise development.
  • a pin-shaped end portion 10 at.
  • the pin-shaped end portion 10 has circumferentially on a flattening 11, which serves the flow guide.
  • an injection hole 4' with a reduced spray hole length can also be provided Fig. 4 shown.
  • the reduction of the injection hole length is effected by a reduction 8, which is formed outside the nozzle body 2 in the present case.
  • a depression 8 may be provided on the inside of the nozzle body 2.
  • the reduced spray hole length also leads to a change in the mixture preparation, so that a previous combustion start in a defined region of the combustion chamber 1 can be achieved.
  • Fig. 5 has a single injection hole 4 'of the bolt circle forming injection holes 4 on a modified conicity.
  • the individual injection hole 4 ' has a negative conicity. This means that the flow cross-section becomes larger from the inside to the outside or the spray hole 4 'expands outwards. This measure also leads to a changed mixture formation and an early combustion start in a certain area of the combustion chamber 1.

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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 einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum (1) einer Brennkraftmaschine, umfassend einen Düsenkörper (2) und eine Düsennadel (3), die zum Freigeben und Verschließen mehrerer Spritzlöcher (4) in einer zentralen Bohrung (5) des Düsenkörpers (2) hubbeweglich aufgenommen ist, wobei die mehreren Spritzlöcher (4) in einem Lochkreis angeordnet sind und von einem im Düsenkörper (2) ausgebildeten konisch geformten Dichtsitz (6) oder von einem sich an den Dichtsitz (6) anschließenden Sackloch (7) abgehen. Erfindungsgemäß unterscheidet sich ein Spritzloch (4') des Lochkreises von den übrigen Spritzlöchern (4) des Lochkreises, die alle gleich ausgebildet sind, dadurch, dass es einen verringerten Strömungsquerschnitt, einen sich zum Brennraum (1) hin weitenden Strömungsquerschnitt oder eine verringerte Spritzlochlänge aufweist. Alternativ oder ergänzend wird vorgeschlagen, dass stromaufwärts des Lochkreises ein weiteres Spritzloch (4") angeordnet ist, das gegenüber den Spritzlöchern (4) des Lochkreises einen verringerten Strömungsquerschnitt besitzt. Ferner betrifft die Erfindung einen Kraftstoffinjektor mit einer solchen Düsenbaugruppe.The invention relates to a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber (1) of an internal combustion engine, comprising a nozzle body (2) and a nozzle needle (3) for releasing and closing a plurality of injection holes (4) in a central bore (5 ) of the nozzle body (2) is received in a liftable manner, wherein the plurality of injection holes (4) are arranged in a bolt circle and of a nozzle body (2) formed in the conical seal seat (6) or of a sealing seat (6) subsequent blind hole ( 7) go out. According to the invention, an injection hole (4 ') of the bolt circle differs from the other spray holes (4) of the bolt circle, all of which have the same design, in that it has a reduced flow cross-section, a flow cross-section extending to the combustion chamber (1) or a reduced spray hole length , As an alternative or in addition, it is proposed that a further injection hole (4 ") be arranged upstream of the hole circle, which has a reduced flow cross-section with respect to the spray holes (4) of the pitch circle.

Description

Die Erfindung betrifft eine Düsenbaugruppe für einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ferner betrifft die Erfindung einen Kraftstoffinjektor mit einer solchen Düsenbaugruppe.The invention relates to a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly.

Stand der TechnikState of the art

Aus der Offenlegungsschrift DE 10 2010 063 355 A1 ist ein Kraftstoffeinspritzventil für Brennkraftmaschinen bekannt, das eine in einem Druckraum eines Ventilkörpers längsverschieblich angeordnete Ventilnadel zur Steuerung eines Kraftstoffflusses aus dem Druckraum zu im Ventilköper ausgebildeten Einspritzöffnungen umfasst. Die Ventilnadel weist hierzu eine Ventildichtfläche auf, die mit einem im Ventilkörper ausgebildeten konischen Ventilsitz zusammenwirkt. Ferner weist die Ventilnadel eine Ventilnadelspitze auf, die in Schließstellung der Ventilnadel in ein Sackloch des Ventilkörpers hineinragt, das sich an den Ventilsitz anschließt. Die Ventilnadelspitze überdeckt dabei die im Ventilkörper ausgebildeten Einspritzöffnungen. Um auch bei einer Desachsierung der Ventilnadel und/oder bei kleinem Ventilnadelhub zur Realisierung einer Voreinspritzung eine gleichmäßige Kraftstoffverteilung zu gewährleisten, wird in dieser Druckschrift eine einzelne Einspritzöffnung vorgeschlagen, die stromabwärts der Ventilnadelspitze angeordnet ist und demzufolge stets voll mit Kraftstoff versorgt wird. Ferner wird vorgeschlagen, den Durchmesser der einzelnen Einspritzöffnung gegenüber dem Durchmesser der übrigen Einspritzöffnungen zu verringern, um zu verhindern, dass der einzelnen Einspritzöffnung mehr Kraftstoff als den übrigen Einspritzöffnungen zugeführt wird.From the publication DE 10 2010 063 355 A1 a fuel injection valve for internal combustion engines is known, which comprises a longitudinally displaceably arranged in a pressure chamber of a valve body valve needle for controlling a fuel flow from the pressure chamber to injection valve openings formed in the valve body. For this purpose, the valve needle has a valve sealing surface which cooperates with a conical valve seat formed in the valve body. Furthermore, the valve needle has a valve needle tip, which projects into the closed position of the valve needle in a blind hole of the valve body, which adjoins the valve seat. The valve needle tip covers the injection openings formed in the valve body. In order to ensure a uniform fuel distribution even at a disaccentration of the valve needle and / or small valve needle to realize a pilot injection, a single injection port is proposed in this document, which is arranged downstream of the valve needle tip and is therefore always supplied with fuel. It is also proposed to reduce the diameter of the individual injection opening with respect to the diameter of the remaining injection openings in order to prevent the individual injection opening from being supplied with more fuel than the remaining injection openings.

Wie bereits der DE 10 2010 063 355 A1 zu entnehmen ist, dient ein auf mehreren Teileinspritzungen beruhendes Einspritzmuster, das insbesondere eine oder mehrere Voreinspritzungen umfasst, hauptsächlich dazu, den Verbrennungsverlauf "weicher" zu machen und die Schadstoffemission zu minimieren.Like the one already DE 10 2010 063 355 A1 can be seen, is based on a plurality of partial injections injection pattern, which includes in particular one or more pilot injections, mainly to make the combustion process "softer" and to minimize the emission of pollutants.

Bei der Verbrennung von Dieselkraftstoffen kann durch eine oder mehrere Voreinspritzungen einem ausgeprägten Verbrennungsgeräusch entgegengewirkt werden, das auch als "Diesel-Nageln" oder "Dieselschlag" bekannt ist. Voreinspritzungen erfordern jedoch einen erhöhten Applikationsaufwand, da Mengen und Abstände der einzelnen Voreinspritzungen für jeden motorischen Betriebspunkt festgelegt werden müssen. Des Weiteren führen Voreinspritzungen zu einem höheren Kraftstoffverbrauch, da sie nicht oder nur zum Teil zur Bildung des zu erzeugenden Drehmoments beitragen.In the combustion of diesel fuels can be counteracted by one or more pilot injections a pronounced combustion noise, which is also known as "diesel nailing" or "diesel blow". However, pre-injections require an increased application effort, since quantities and distances of the individual pilot injections must be set for each engine operating point. Furthermore, pilot injections lead to higher fuel consumption because they do not or only partially contribute to the formation of the torque to be generated.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Düsenbaugruppe für einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine anzugeben, die bei reduzierter Voreinspritzmenge oder bei Verzicht auf eine Voreinspritzung eine geräuscharme Verbrennung des eingespritzten Kraftstoffs ermöglicht.The present invention is therefore based on the object of specifying a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, which enables low-noise combustion of the injected fuel at a reduced pre-injection quantity or when a pre-injection is dispensed with.

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 Kraftstoffinjektor mit einer solchen Düsenbaugruppe vorgeschlagen.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. Furthermore, a fuel injector is proposed with such a nozzle assembly.

Offenbarung der ErfindungDisclosure of the invention

Die für einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine vorgeschlagene Düsenbaugruppe umfasst einen Düsenkörper und eine Düsennadel, die zum Freigeben und Verschließen mehrerer Spritzlöcher in einer zentralen Bohrung des Düsenkörpers hubbeweglich aufgenommen ist. Die mehreren Spritzlöcher sind dabei in einem Lochkreis angeordnet und gehen von einem im Düsenkörper ausgebildeten konisch geformten Dichtsitz oder von einem sich an den Dichtsitz anschließenden Sackloch ab. Erfindungsgemäß unterscheidet sich ein Spritzloch des Lochkreises von den übrigen Spritzlöcher des Lochkreises, die alle gleich ausgebildet sind, dadurch, dass es einen verringerten Strömungsquerschnitt, einen sich zum Brennraum hin weitenden Strömungsquerschnitt oder eine verringerte Spritzlochlänge aufweist. Alternativ oder ergänzend wird vorgeschlagen, dass stromaufwärts des Lochkreises ein weiteres Spritzloch angeordnet ist, das gegenüber den Spritzlöchern des Lochkreises einen verringerten Strömungsquerschnitt besitzt.The nozzle assembly proposed for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine comprises a nozzle body and a nozzle needle, which is received in a liftable manner for releasing and closing a plurality of injection holes in a central bore of the nozzle body. The plurality of injection holes are arranged in a bolt circle and are based on a conical shaped sealing seat formed in the nozzle body or on a blind hole adjoining the sealing seat. According to the invention, a spray hole of the bolt circle differs from the other spray holes of the bolt circle, all the same are formed, characterized in that it has a reduced flow cross-section, a flow cross-section extending to the combustion chamber or a reduced spray hole length. Alternatively or additionally, it is proposed that a further spray hole is arranged upstream of the bolt circle, which has a reduced flow cross section with respect to the spray holes of the bolt circle.

Sämtliche Maßnahmen, allein oder in unterschiedlichen Kombinationen, führen zu einem kleineren mittleren Tropfendurchmesser des eingespritzten Kraftstoffs und damit zu einem früheren Aufbrechen des Einspritzstrahls, wodurch wiederum die Zündgrenze früher erreicht wird. Denn bei einem kleineren mittleren Tropfendurchmesser ändert sich das Oberflächen/Volumen-Verhältnis bzw. die Gemischbildung. Der sich früher entzündende Einspritzstrahl kann dann als Zündherd für die weiteren Einspritzstrahlen dienen. Über diesen einen Zündherd kann ein gestaffeltes und damit langsames Anzünden der weiteren Einspritzstrahlen bewirkt werden, was sich wiederum geräuschmindernd auswirkt. Zugleich kann auf eine Voreinspritzung verzichtet oder zumindest die Voreinspritzmenge reduziert werden.All of the measures, alone or in different combinations, result in a smaller mean droplet diameter of the injected fuel and thus earlier break-up of the injection jet which, in turn, achieves the ignition limit earlier. Because with a smaller mean droplet diameter, the surface / volume ratio or the mixture formation changes. The earlier igniting injection jet can then serve as a source of ignition for the other injection jets. About this one ignition a staggered and thus slow ignition of the other injection jets can be effected, which in turn has a noise-reducing effect. At the same time can be dispensed with a pilot injection or at least the pre-injection amount can be reduced.

Bevorzugt ist lediglich ein einziges Spritzloch kleiner, kürzer und/oder sich konisch weitend ausgebildet, um einen einzigen Zündherd in einem definierten Bereich des Brennraums zu erzeugen. Auf diese Weise kann der Zündherd lokal begrenzt werden, um das Anzünden zu verlangsamen.Preferably, only a single spray hole is smaller, shorter and / or conically widening formed to produce a single ignition in a defined region of the combustion chamber. In this way, the ignition can be limited locally to slow the lighting.

Die den Lochkreis bildenden Spritzlöcher können vom Dichtsitz oder vom Sackloch abgehen. Das heißt, dass die Düse als Sitzlochdüse oder als Sacklochdüse ausgebildet sein kann. Sofern jedoch ein außerhalb des Lochkreises liegendes Spritzloch mit verringertem Strömungsquerschnitt vorgesehen ist, ist zumindest dieses im Bereich des Dichtsitzes angeordnet. Durch die Anordnung des weiteren Spritzlochs im Bereich des Dichtsitzes ist eine Vergrößerung des Sacklochs nicht erforderlich. Auf diese Weise kann die nach dem Schließen der Düsennadel über das Sackloch in den Brennraum gelangende Kraftstoffmenge gering gehalten werden.The injection holes forming the bolt circle can leave the sealing seat or the blind hole. This means that the nozzle can be designed as a seat hole nozzle or as a blind hole nozzle. However, if an injection hole outside the hole circle is provided with a reduced flow cross-section, at least this is arranged in the region of the sealing seat. Due to the arrangement of the further injection hole in the region of the sealing seat, an enlargement of the blind hole is not required. In this way, after reaching the nozzle needle via the blind hole into the combustion chamber reaching amount of fuel can be kept low.

Sofern ein Spritzloch mit verringerter Spritzlochlänge vorgesehen ist, weist der Düsenkörper bevorzugt im Bereich dieses Spritzlochs eine reduzierte Wandstärke auf. Die Wandstärkenreduzierung kann in einfacher Weise während des Erodierungsprozesses zur Herstellung des Spritzlochs realisiert werden.If a spray hole with a reduced spray hole length is provided, the nozzle body preferably has a reduced wall thickness in the region of this spray hole. The Wall thickness reduction can be realized in a simple manner during the erosion process for the production of the injection hole.

Zur Reduzierung der Wandstärke kann der Düsenkörper im Bereich des Spritzlochs mit verringerter Spritzlochlänge eine innen- und/oder außenseitig angeordnete Absenkung aufweisen. Die Absenkung kann zur Strömungsoptimierung insbesondere konisch oder sphärisch geformt sein.To reduce the wall thickness of the nozzle body in the region of the injection hole with reduced spray hole length may have an internally and / or externally disposed lowering. The reduction can be shaped to optimize flow, in particular conical or spherical.

Ferner bevorzugt weist die Düsennadel eine mit dem Dichtsitz zusammenwirkende Dichtkontur auf, die konisch geformt ist. Der Konuswinkel kann gleich dem des Dichtsitzes oder geringfügig größer gewählt werden, um eine ringförmige Dichtkontur auszubilden, die ein sicheres Schließen ermöglicht. Der Konuswinkel des Dichtsitzes kann beispielsweise 30°, 60°, 90° oder 120° betragen.Furthermore, the nozzle needle preferably has a sealing contour cooperating with the sealing seat, which is conically shaped. The cone angle can be chosen equal to that of the sealing seat or slightly larger to form an annular sealing contour that allows a safe closing. The cone angle of the sealing seat can be, for example, 30 °, 60 °, 90 ° or 120 °.

In Weiterbildung der Erfindung wird vorgeschlagen, dass die Düsennadel einen Endabschnitt aufweist, der in Schließstellung der Düsennadel in das Sackloch hineinragt. Auf diese Weise kann das Volumen des Sacklochs reduziert werden, so dass nach dem Schließen der Düsennadel weniger Kraftstoff im Sackloch verbleibt. Dies hat zur Folge, dass nach dem Schließen der Düsennadel auch weniger Kraftstoff über das Sackloch in den Brennraum gelangt. Denn auf diesem Wege in den Brennraum gelangender Kraftstoff wird nicht ausreichend zerstäubt und verbrennt nur unvollständig, wodurch die Schadstoffemissionen steigen.In a further development of the invention, it is proposed that the nozzle needle has an end section which projects into the blind hole in the closed position of the nozzle needle. In this way, the volume of the blind hole can be reduced, so that after closing the nozzle needle less fuel remains in the blind hole. This has the consequence that after closing the nozzle needle and less fuel passes through the blind hole in the combustion chamber. Because in this way into the combustion chamber reaching fuel is not sufficiently atomized and burns only incomplete, whereby the pollutant emissions rise.

Der in das Sackloch hineinragende Endabschnitt der Düsennadel kann konisch und/oder zapfenförmig ausgebildet sein. Über einen zapfenförmigen Endabschnitt kann das Volumen des Sacklochs am deutlichsten reduziert werden. Ferner kann über einen zapfenförmigen Endabschnitt eine Strömungsführung bewirkt werden und/oder ein Strömungsspalt ausgebildet werden, der als Verzögerungs-Abdrosselungsglied zu Beginn der Einspritzung wirkt.The projecting into the blind hole end portion of the nozzle needle may be formed conical and / or peg-shaped. About a pin-shaped end portion, the volume of the blind hole can be reduced most clearly. Further, a flow guide can be effected via a pin-shaped end portion and / or a flow gap can be formed, which acts as a delay-throttling member at the beginning of the injection.

Zur Optimierung der Strömungsführung weist der Endabschnitt der Düsennadel bevorzugt mindestens eine umfangseitige Abflachung in Form eines Anschliffs auf. Vorzugsweise ist der Endabschnitt der Düsennadel als Dreiflach ausgeführt.To optimize the flow guidance, the end section of the nozzle needle preferably has at least one peripheral flattening in the form of a bevel. Preferably, the end portion of the nozzle needle is designed as a triflate.

Über die Strömungsführung, das Verzögerungs-Abdrosselungsglied und/oder die Anschliffe kann eine Ratenverlaufsformung zu Beginn der Einspritzung erzeugt werden, welche den gewünschten Effekt einer langsamen Anzündung der Einspritzstrahlen zur Vermeidung ausgeprägter Verbrennungsgeräusche weiter verstärkt.Rate shaping can be generated at the beginning of the injection via the flow guide, the retarding restrictor and / or the contours, which further enhances the desired effect of slowly igniting the injection jets to avoid pronounced combustion noise.

Zur Lösung der eingangs genannten Aufgabe wird darüber hinaus ein Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine vorgeschlagen, der eine erfindungsgemäße Düsenbaugruppe umfasst. Die Düsenbaugruppe ermöglicht eine Veränderung der Gemischbildung in einem definierten Bereich des Brennraums, so dass die Zündung des Gas-Kraftstoffgemischs in diesem Bereich gefördert wird. Die Folge ist ein früher Verbrennungsstart in einem lokal begrenzten Bereich, der mit einem langsamen Anzünden der weiteren Einspritzstrahlen einhergeht. Auf diese Weise können Verbrennungsgeräusche deutlich reduziert werden.To solve the problem mentioned above, a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine is proposed, which comprises a nozzle assembly according to the invention. The nozzle assembly allows a change in the mixture formation in a defined region of the combustion chamber, so that the ignition of the gas-fuel mixture is promoted in this area. The result is an early combustion start in a localized area, which is accompanied by a slow ignition of the further injection jets. In this way combustion noise can be significantly reduced.

Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen:

  • Fig. 1 einen schematischen Längsschnitt durch eine erfindungsgemäße Düsenbaugruppe gemäß einer ersten bevorzugten Ausführungsform,
  • Fig. 2 einen schematischen Längsschnitt durch eine erfindungsgemäße Düsenbaugruppe gemäß einer zweiten bevorzugten Ausführungsform,
  • Fig. 3 einen schematischen Längsschnitt durch eine erfindungsgemäße Düsenbaugruppe gemäß einer dritten bevorzugten Ausführungsform,
  • Fig. 4 einen schematischen Längsschnitt durch eine erfindungsgemäße Düsenbaugruppe gemäß einer vierten bevorzugten Ausführungsform und
  • Fig. 5 einen schematischen Längsschnitt durch eine erfindungsgemäße Düsenbaugruppe gemäß einer fünften bevorzugten Ausführungsform.
Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show:
  • Fig. 1 a schematic longitudinal section through a nozzle assembly according to the invention according to a first preferred embodiment,
  • Fig. 2 a schematic longitudinal section through a nozzle assembly according to the invention according to a second preferred embodiment,
  • Fig. 3 a schematic longitudinal section through a nozzle assembly according to the invention according to a third preferred embodiment,
  • Fig. 4 a schematic longitudinal section through a nozzle assembly according to the invention according to a fourth preferred embodiment and
  • Fig. 5 a schematic longitudinal section through a nozzle assembly according to the invention according to a fifth preferred embodiment.

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Die in der Fig. 1 dargestellte Düsenbaugruppe umfasst einen Düsenkörper 2 mit einer zentralen Bohrung 5, in der eine Düsennadel 3 hubbeweglich aufgenommen ist. Über die Hubbewegung der Düsennadel 3 sind im Düsenkörper 2 ausgebildete Spritzlöcher 4 freigebbar oder verschließbar, die kreisförmig in einer Radialebene angeordnet sind und einen Lochkreis bilden. Zum Verschließen der Spritzlöcher 4 weist die Düsennadel 3 eine konisch geformte Dichtkontur 9 auf, die mit einem konisch geformten Dichtsitz 6 des Düsenkörpers 2 zusammenwirkt. Da die Spritzlöcher 4 im Bereich eines sich an den Dichtsitz 6 anschließenden Sacklochs 7 angeordnet sind, werden sie nicht unmittelbar durch die Düsennadel 3 verschlossen, sondern es wird lediglich die Kraftstoffzufuhr in Richtung der Spritzlöcher 4 unterbrochen. Zum Freigeben der Spritzlöcher muss die Düsennadel 3 aus dem Dichtsitz 6 gehoben werden. Die hierzu erforderliche Aktorik ist in der Fig. 1 nicht dargestellt.The in the Fig. 1 illustrated nozzle assembly comprises a nozzle body 2 with a central bore 5, in which a nozzle needle 3 is received liftable. About the lifting movement of the nozzle needle 3 formed in the nozzle body 2 spray holes 4 are releasable or closable, which are arranged in a circular plane in a radial plane and form a bolt circle. For closing the injection holes 4, the nozzle needle 3 has a conically shaped sealing contour 9, which cooperates with a conically shaped sealing seat 6 of the nozzle body 2. Since the injection holes 4 are arranged in the region of a blind hole 7 adjoining the sealing seat 6, they are not closed directly by the nozzle needle 3, but only the fuel supply in the direction of the injection holes 4 is interrupted. To release the spray holes, the nozzle needle 3 must be lifted out of the sealing seat 6. The required Aktorik is in the Fig. 1 not shown.

Das Sackloch 7 ist in einer endseitigen Kuppe 12 des Düsenkörpers 2 ausgebildet. Die Düsennadel 3 weist einen sich an die Dichtkontur 9 anschließenden Endabschnitt 10 auf, der in das Sackloch 7 eintaucht. Dadurch wird das Volumen des Sacklochs 7 verkleinert. Der Endabschnitt 10 ist konisch geformt, wobei der Konuswinkel größer als der Konuswinkel der Dichtkontur 9 gewählt ist.The blind hole 7 is formed in an end tip 12 of the nozzle body 2. The nozzle needle 3 has an adjoining the sealing contour 9 end portion 10 which dips into the blind hole 7. As a result, the volume of the blind hole 7 is reduced. The end portion 10 is conically shaped, wherein the cone angle is greater than the cone angle of the sealing contour 9 is selected.

Bei einer Hubbewegung der Düsennadel 3 strömt unter hohem Druck stehender Kraftstoff aus der Bohrung 5 in Richtung der im Bereich des Sacklochs 7 angeordneten Spritzlöcher 4. Über die Spritzlöcher 4 wird dann der unter hohem Druck stehende Kraftstoff in einen Brennraum 1 eingespritzt. Da ein Spritzloch 4' der den Lochkreis bildenden Spritzlöcher 4 einen verringerten Strömungsquerschnitt besitzt, wird der hierüber eingespritzte Kraftstoff bei Eintritt in den Brennraum 1 besonders fein zerstäubt. Dies hat zur Folge, dass er früher zündet und als Zündherd für den Kraftstoff bzw. das Gas-Kraftstoffgemisch dient, das über die weiteren Spritzlöcher 4 erzeugt wird. Der einzelne Zündherd in einem definierten Bereich des Brennraums 1 führt dabei zu einem gestaffelten Anzünden der über die weiteren Spritzlöcher 4 in den Brennraum 1 eingebrachten Einspritzstrahlen, so dass die Verbrennung mit einer geringeren Geräuschentwicklung einhergeht.During a lifting movement of the nozzle needle 3, high-pressure fuel flows out of the bore 5 in the direction of the injection holes 4 arranged in the region of the blind hole 7. The high-pressure fuel is then injected into a combustion chamber 1 via the injection holes 4. Since a spray hole 4 'of the hole circle forming injection holes 4 has a reduced flow cross-section, the fuel injected over this is atomized particularly fine when entering the combustion chamber 1. This has the consequence that it ignites earlier and serves as a source of ignition for the fuel or the gas-fuel mixture, which is generated via the further injection holes 4. The individual ignition in a defined region of the combustion chamber 1 leads to a staggered lighting of the injection jets introduced into the combustion chamber 1 via the further injection holes 4, so that the combustion is accompanied by a lower noise development.

Bei dem in der Fig. 2 dargestellten Ausführungsbeispiel weisen die den Lochkreis bildenden Spritzlöcher 4 den gleichen Strömungsquerschnitt auf. Um dennoch einen frühen Verbrennungsstart in einem definierten Bereich des Brennraums 1 zu erwirken, ist im Bereich des Dichtsitzes 6 ein einzelnes Spritzloch 4" vorgesehen, das einen verringerten Strömungsquerschnitt besitzt.In the in the Fig. 2 illustrated embodiment, the hole circle forming injection holes 4 to the same flow cross-section. Nevertheless, an early one To initiate combustion start in a defined region of the combustion chamber 1, a single injection hole 4 "is provided in the region of the sealing seat 6, which has a reduced flow cross-section.

Bei dem in der Fig. 3 dargestellten Ausführungsbeispiel schließt sich an die Dichtkontur 9 der Düsennadel 3 ein zapfenförmiger Endabschnitt 10 an. Durch den zapfenförmigen Endabschnitt 10 wird das Volumen des Sacklochs 7 weiter reduziert. Der zapfenförmige Endabschnitt 10 weist umfangseitig eine Abflachung 11 auf, die der Strömungsführung dient.In the in the Fig. 3 illustrated embodiment is followed by the sealing contour 9 of the nozzle needle 3, a pin-shaped end portion 10 at. By the pin-shaped end portion 10, the volume of the blind hole 7 is further reduced. The pin-shaped end portion 10 has circumferentially on a flattening 11, which serves the flow guide.

Anstelle eines Spritzlochs 4', 4" mit verringertem Strömungsquerschnitt kann auch ein Spritzloch 4' mit einer verringerten Spritzlochlänge vorgesehen sein. Dieses Ausführungsbeispiel ist in der Fig. 4 dargestellt. Die Verringerung der Spritzlochlänge wird durch eine Absenkung 8 bewirkt, die vorliegend außen am Düsenkörper 2 ausgebildet ist. Alternativ oder ergänzend kann auch eine Absenkung 8 innen am Düsenkörper 2 vorgesehen sein. Die verringerte Spritzlochlänge führt ebenfalls zu einer Veränderung der Gemischaufbereitung, so dass ein früherer Verbrennungsstart in einem definierten Bereich des Brennraums 1 erreichbar ist.Instead of a spray hole 4 ', 4 "with a reduced flow cross section, an injection hole 4' with a reduced spray hole length can also be provided Fig. 4 shown. The reduction of the injection hole length is effected by a reduction 8, which is formed outside the nozzle body 2 in the present case. Alternatively or additionally, a depression 8 may be provided on the inside of the nozzle body 2. The reduced spray hole length also leads to a change in the mixture preparation, so that a previous combustion start in a defined region of the combustion chamber 1 can be achieved.

Bei dem Ausführungsbeispiel der Fig. 5 weist ein einzelnes Spritzloch 4' der den Lochkreis bildenden Spritzlöcher 4 eine veränderte Konizität auf. Im Unterschied zu den übrigen Spritzlöchern 4, die eine für Spritzlöcher übliche positive Konizität aufweisen, weist das einzelne Spritzloch 4' eine negative Konizität auf. Das heißt, dass der Strömungsquerschnitt von innen nach außen größer wird bzw. sich das Spritzloch 4' nach außen hin weitet. Auch diese Maßnahme führt zu einer veränderten Gemischbildung und einem frühen Verbrennungsstart in einem bestimmten Bereich des Brennraums 1.In the embodiment of the Fig. 5 has a single injection hole 4 'of the bolt circle forming injection holes 4 on a modified conicity. In contrast to the other spray holes 4, which have a conventional positive taper for injection holes, the individual injection hole 4 'has a negative conicity. This means that the flow cross-section becomes larger from the inside to the outside or the spray hole 4 'expands outwards. This measure also leads to a changed mixture formation and an early combustion start in a certain area of the combustion chamber 1.

Claims (10)

Düsenbaugruppe für einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum (1) einer Brennkraftmaschine, umfassend einen Düsenkörper (2) und eine Düsennadel (3), die zum Freigeben und Verschließen mehrerer Spritzlöcher (4) in einer zentralen Bohrung (5) des Düsenkörpers (2) hubbeweglich aufgenommen ist, wobei die mehreren Spritzlöcher (4) in einem Lochkreis angeordnet sind und von einem im Düsenkörper (2) ausgebildeten konisch geformten Dichtsitz (6) oder von einem sich an den Dichtsitz (6) anschließenden Sackloch (7) abgehen,
dadurch gekennzeichnet, dass
ein Spritzloch (4') des Lochkreises sich von den übrigen Spritzlöchern (4) des Lochkreises, die alle gleich ausgebildet sind, unterscheidet und
einen verringerten Strömungsquerschnitt, einen sich zum Brennraum (1) hin weitenden Strömungsquerschnitt oder eine verringerte Spritzlochlänge aufweist
und/oder,
dass stromaufwärts des Lochkreises ein weiteres Spritzloch (4") angeordnet ist, das gegenüber den Spritzlöchern (4) des Lochkreises einen verringerten Strömungsquerschnitt besitzt.A nozzle assembly for a fuel injector for injecting fuel into a combustion chamber (1) of an internal combustion engine, comprising a nozzle body (2) and a nozzle needle (3) for releasing and closing a plurality of injection holes (4) in a central bore (5) of the nozzle body (5). 2) is received in a liftable manner, wherein the plurality of spray holes (4) are arranged in a bolt circle and from a in the nozzle body (2) formed conically shaped sealing seat (6) or from a to the sealing seat (6) adjoining blind hole (7),
characterized in that
an injection hole (4 ') of the bolt circle is different from the other spray holes (4) of the bolt circle, which are all the same, and
a reduced flow cross-section, a to the combustion chamber (1) towards expanding flow cross-section or a reduced spray hole length
and or,
that a further injection hole (4 ") is arranged upstream of the bolt circle, which has a reduced flow cross-section with respect to the spray holes (4) of the bolt circle. Düsenbaugruppe nach Anspruch 1,
dadurch gekennzeichnet, dass zumindest das weitere Spritzloch (4") im Bereich des Dichtsitzes (6) angeordnet ist.Nozzle assembly according to claim 1,
characterized in that at least the further injection hole (4 ") in the region of the sealing seat (6) is arranged. Düsenbaugruppe nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass der Düsenkörper (2) im Bereich des Spritzlochs (4') mit verringerter Spritzlochlänge eine reduzierte Wandstärke aufweist.Nozzle assembly according to claim 1 or 2,
characterized in that the nozzle body (2) in the region of the injection hole (4 ') with reduced spray hole length has a reduced wall thickness. Düsenbaugruppe nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Düsenkörper (2) im Bereich des Spritzlochs (4') mit verringerter Spritzlochlänge eine innen- und/oder außenseitig angeordnete Absenkung (8) zur Reduzierung der Wandstärke aufweist.Nozzle assembly according to one of the preceding claims,
characterized in that the nozzle body (2) in the region of the injection hole (4 ') with a reduced spray hole length has an internally and / or externally arranged lowering (8) for reducing the wall thickness. Düsenbaugruppe nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die Düsennadel (3) eine mit dem Dichtsitz (6) zusammenwirkende Dichtkontur (9) aufweist, die konisch geformt ist.Nozzle assembly according to one of the preceding claims,
characterized in that the nozzle needle (3) has a with the sealing seat (6) cooperating sealing contour (9) which is conically shaped. Düsenbaugruppe nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die Düsennadel (3) einen Endabschnitt (10) aufweist, der in Schließstellung der Düsennadel (3) in das Sackloch (7) hineinragt.Nozzle assembly according to one of the preceding claims,
characterized in that the nozzle needle (3) has an end portion (10) which projects into the blind hole (7) in the closed position of the nozzle needle (3). Düsenbaugruppe nach Anspruch 6,
dadurch gekennzeichnet, dass der Endabschnitt (10) der Düsennadel (3) konisch und/oder zapfenförmig ausgebildet ist.Nozzle assembly according to claim 6,
characterized in that the end portion (10) of the nozzle needle (3) is conical and / or peg-shaped. Düsenbaugruppe nach Anspruch 6 oder 7,
dadurch gekennzeichnet, dass der Endabschnitt (10) der Düsennadel (3) mindestens eine umfangseitige Abflachung (11) in Form eines Anschliffs aufweist.Nozzle assembly according to claim 6 or 7,
characterized in that the end portion (10) of the nozzle needle (3) has at least one peripheral flattening (11) in the form of a bevel. Düsenbaugruppe nach einem der Anspruch 6 bis 8,
dadurch gekennzeichnet, dass der Endabschnitt (10) der Düsennadel (3) als Dreiflach ausgeführt ist.Nozzle assembly according to one of claims 6 to 8,
characterized in that the end portion (10) of the nozzle needle (3) is designed as a triple flat. Kraftstoffinjektor zum Einspritzen von Kraftstoff in einen Brennraum (1) einer Brennkraftmaschine mit einer Düsenbaugruppe nach einem der vorhergehenden Ansprüche.Fuel injector for injecting fuel into a combustion chamber (1) of an internal combustion engine with a nozzle assembly according to one of the preceding claims.
EP16192230.7A 2015-11-26 2016-10-04 Nozzle assembly for a fuel injector and fuel injector Active EP3173614B1 (en)

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WO2020043496A1 (en) * 2018-08-29 2020-03-05 Robert Bosch Gmbh Fuel injector
US20220228545A1 (en) * 2021-01-19 2022-07-21 Honda Motor Co., Ltd. Internal combustion engine
EP4036397A4 (en) * 2019-09-25 2022-11-02 Bosch Corporation Fuel injection valve, and internal combustion engine provided with fuel injection valve

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DE102018209099A1 (en) 2018-06-08 2019-12-12 Robert Bosch Gmbh Internal combustion engine with adaptive injection behavior
DE102018209097A1 (en) 2018-06-08 2019-12-12 Robert Bosch Gmbh Injector and internal combustion engine with adaptive injection behavior
DE102018209101A1 (en) 2018-06-08 2019-12-12 Robert Bosch Gmbh Injector and internal combustion engine with adaptive injection behavior
DE102018209096A1 (en) 2018-06-08 2019-12-12 Robert Bosch Gmbh Injector and internal combustion engine with adaptive injection behavior

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FR2888284A3 (en) * 2005-07-08 2007-01-12 Renault Sas Internal combustion engine for motor vehicle, has injector with nozzle, whose free end comprises secondary orifice for supplying fuel to primary orifices, where axis of secondary orifice is oriented towards end of preheater plug
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