EP2329133A1 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP2329133A1
EP2329133A1 EP09780220A EP09780220A EP2329133A1 EP 2329133 A1 EP2329133 A1 EP 2329133A1 EP 09780220 A EP09780220 A EP 09780220A EP 09780220 A EP09780220 A EP 09780220A EP 2329133 A1 EP2329133 A1 EP 2329133A1
Authority
EP
European Patent Office
Prior art keywords
hole
fuel injection
injection hole
valve according
fuel
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
EP09780220A
Other languages
German (de)
French (fr)
Other versions
EP2329133B1 (en
Inventor
Andreas Kerst
Thorsten Rankel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2329133A1 publication Critical patent/EP2329133A1/en
Application granted granted Critical
Publication of EP2329133B1 publication Critical patent/EP2329133B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

Definitions

  • the invention relates to a fuel injection valve, in particular an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a fuel injection valve for internal combustion engines has a valve body in which a pressure chamber is formed, in the wall of which an injection channel is arranged.
  • the injection channel extends in the valve body and forms an outlet opening on the outside of the valve body.
  • the injection channel seen in the flow direction comprises a first conical portion and an adjoining second conical portion.
  • the two conical sections narrow in the direction of flow. Furthermore, the two conical sections have different opening angles.
  • Fuel injector can be a good atomization and
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that a further optimization of a nozzle-near atomization at a high efficiency is possible. Specifically, a nozzle-near atomization can take place without a significant deterioration of the efficiency takes place. Specifically, deflection losses can be substantially avoided or completely prevented.
  • the inflow region of the injection hole is rounded, while the outer hole region is sharp-edged and free of burrs.
  • the rounded-off inflow region preferably proceeds uniformly and without edges into a valve seat surface.
  • a wall of the spray hole is configured such that a flow line extending in the flow direction along a surface of the wall is designed kink-free. As a result, turbulence in the region of the surface of the wall of the spray hole is prevented, whereby flow losses are reduced.
  • the flow line running along the surface of the wall is S-shaped is, wherein the S-shaped configuration preferably also extends over the inflow region and the outer hole region.
  • a cross-sectional area of the injection hole perpendicular to an axis oriented in the flow direction of the injection hole decreases continuously along the axis in the flow direction.
  • a continuous narrowing of the spray hole is achieved in the flow direction, which can run uniformly, at least in a central portion.
  • the efficiency can be optimized.
  • the cross-sectional area decreases relatively strongly in the outer hole area along the axis in the flow direction.
  • the decrease in the cross-sectional area in a middle region between the inflow region and the outer hole region in the flow direction may decrease uniformly, wherein the decrease of the cross-sectional area in the flow direction in the central region is preferably relatively weak.
  • a deflection can be achieved, which takes place in the middle region towards the axis and is more pronounced in the outer hole region.
  • nozzle-near atomization can be achieved with high efficiency.
  • a tear-off edge is provided in the outer hole region of the injection hole, which is directed onto the axis of the injection hole. As a result, the atomization of the sprayed fuel can be improved.
  • Fig. 1 is a schematic representation of a fuel injection valve in a partial sectional view according to an embodiment of the invention
  • Fig. 2 the designated in Fig. 1 with II cutout in more detail.
  • Fig. 1 shows a fuel injection valve 1 in a schematic, partial sectional view according to an embodiment of the invention.
  • the fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1.
  • the fuel injection valve 1 according to the invention is also suitable for other applications.
  • Fuel injection valve 1 has a nozzle body 2, in which a nozzle needle 3 is mounted axially displaceable.
  • the nozzle needle 3 is actuated by means of an actuator 4.
  • the actuator 4 may, for example have mechanical and hydraulic components, wherein the control can be effected by means of a piezoelectric actuator or a solenoid valve.
  • the action of the actuating device 4 on the nozzle needle 3 is illustrated by the double arrow 5.
  • the fuel injection valve 1 is suitably connected to a fuel pump, for example via a common rail. During operation of the fuel injection valve 1, therefore, there is fuel under high pressure in a fuel space 6 provided inside the nozzle body 2.
  • the nozzle body 2 has a valve seat surface 7 which cooperates with a valve closing body 8 of the nozzle needle 3 to form a sealing seat.
  • the sealing seat is formed on a sealing edge 9 of the valve seat surface 7. Downstream of the sealing edge 9, the nozzle body 2 has at least one injection hole 15.
  • the injection hole 15 is configured in this embodiment as a blind-hole injection port 15.
  • the spray hole 15 may be configured as a seat hole nozzle injection hole in a suitably designed fuel injector 1.
  • the injection hole 15 has an inflow region 16, a central region 17 and an outer hole region 18.
  • the middle region 17 is located between the inflow region 16 and the outer hole region 18 of the injection hole 15.
  • the injection hole 15 is rounded in the inflow region 16.
  • the injection hole 15 in the outer hole portion 18 has a taper.
  • the injection hole 15 is also in the outer hole area 18th rounded out.
  • a wall 19 of the injection hole 15 is designed so that no steps, edges, kinks or the like are formed in a surface 20 of the wall 19.
  • the surface 20 of the wall 19 is thus at least substantially smooth and uniform. The design of the injection hole 15 is described below in reference to FIG. 2 in further detail.
  • FIG. 2 shows the section of the nozzle body 2 of the fuel injection valve 1 designated II in FIG. 1 in a schematic sectional illustration.
  • the injection hole 15 has an axis 25, wherein the axis 25 is oriented at least approximately in a flow direction 26.
  • the injection hole 15 is at least approximately symmetrical with respect to the axis 25 configured.
  • FIG. 2 shows by way of example a flow line 27 which runs along the surface 20 of the wall 19 of the spray hole 15. It should be noted that the flow line 27 does not extend in the sectional plane shown in FIG. 2, since it lies in the surface 20 of the wall 19.
  • the flow line 27 is designed kink-free. As a result, the flow line 27 is both continuous, that is, without steps, as well as even, that is, without abrupt changes in direction along their path, along the surface 20 of the wall 19 out. As a result, in particular turbulences are reduced or completely prevented. As a result, a high efficiency can be achieved when flowing through the spray hole 15 with fuel.
  • FIG. 2 illustrates by way of example a cross-sectional area 28 which is oriented perpendicular to the axis 25 of the spray hole 15.
  • the cross-sectional area 28 of the spray hole 15 may be configured, for example, at least approximately circular or elliptical.
  • the injection hole 15 is designed such that the cross-sectional area 28 decreases along the axis 25 in the flow direction 26. This decrease takes place continuously, wherein, for example, a diameter of the cross-sectional area 28 decreases continuously or at least one of the two main axes of an elliptical cross-sectional area 28 is steadily reduced.
  • the cross-sectional area 28 initially decreases relatively strongly. Furthermore, in a middle region 17 of the spray hole 15, the decrease in the cross-sectional area 28 is relatively weak. In the outer hole region 18, the decrease in the cross-sectional area 28 in the flow direction 26 along the axis 25 is again relatively pronounced. This results in an S-shaped configuration of the flow lines of the spray hole 15, in particular the flow line 27. This allows an advantageous flow through the spray hole 15, wherein a deflection is achieved by the configuration of the outer hole portion 18, which leads to a nozzle-near atomization of the sprayed fuel ,
  • the injection hole 15 has in the outer hole region 18 on a circumferential tear-off edge 29, which is configured, for example, circular or elliptical.
  • the tear-off edge 29 is directed onto the axis 25 of the spray hole 15.
  • the trailing edge 29 supports the atomization of sprayed fuel. This allows a nozzle-near atomization of the fuel with high efficiency.
  • the tear-off edge 29 is designed sharp-edged and burr-free.
  • an acute angle 31 is formed in the sectional view.

Landscapes

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

Abstract

The invention relates to a fuel injection valve (1), particularly used as injector for fuel injection units of air compressed, self igniting internal combustion engines, comprises a nozzle body (2) with a valve seat surface (7) and a nozzle needle (3) interacting with the valve seat surface (7) as a sealing seat in order to control a fuel flow to an injection hole (15) located downstream of the sealing seat of the nozzle body (2). The injection hole (15) is rounded at an inflowing region (16). The injection hole (15) further comprises a tapering and a cutting edge (29) at an outer region of the hole (18). Thus high efficiency atomization of fuel close to the nozzle is possible.

Description

Beschreibungdescription
Titeltitle
BrennstoffeinspritzventilFuel injector
Die Erfindung betrifft ein Brennstoffeinspritzventil, insbesondere einen Injektor für Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen.The invention relates to a fuel injection valve, in particular an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
Aus der DE 103 15 967 Al ist ein Brennstoffeinspritzventil für Brennkraftmaschinen bekannt. Das bekannte Brennstoffeinspritzventil weist einen Ventilkörper auf, in dem ein Druckraum ausgebildet ist, in dessen Wandung ein Einspritzkanal angeordnet ist. Der Einspritzkanal verläuft im Ventilkörper und bildet an der Außenseite des Ventilkörpers eine Austrittsöffnung. Hierbei umfasst der Einspritzkanal in Strömungsrichtung gesehen einen ersten konischen Abschnitt und einen daran anschließenden zweiten konischen Abschnitt. Dabei verengen sich die beiden konischen Abschnitte in Strömungsrichtung. Ferner weisen die beiden konischen Abschnitte unterschiedliche Öffnungswinkel auf.From DE 103 15 967 Al a fuel injection valve for internal combustion engines is known. The known fuel injection valve has a valve body in which a pressure chamber is formed, in the wall of which an injection channel is arranged. The injection channel extends in the valve body and forms an outlet opening on the outside of the valve body. Here, the injection channel seen in the flow direction comprises a first conical portion and an adjoining second conical portion. The two conical sections narrow in the direction of flow. Furthermore, the two conical sections have different opening angles.
Bei dem aus der DE 103 15 967 Al bekanntenIn the known from DE 103 15 967 Al
Brennstoffeinspritzventil kann eine gute Zerstäubung undFuel injector can be a good atomization and
Richtungsstabilität des Einspritzstrahls erzielt werden.Directional stability of the injection jet can be achieved.
Offenbarung der ErfindungDisclosure of the invention
Vorteile der Erfindung Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass eine weitere Optimierung einer düsennahen Zerstäubung bei einem hohen Wirkungsgrad möglich ist. Speziell kann eine düsennahe Zerstäubung erfolgen, ohne dass eine wesentliche Verschlechterung des Wirkungsgrades erfolgt. Speziell können Umlenkverluste im Wesentlichen vermieden oder ganz verhindert werden .Advantages of the invention The fuel injection valve according to the invention with the features of claim 1 has the advantage that a further optimization of a nozzle-near atomization at a high efficiency is possible. Specifically, a nozzle-near atomization can take place without a significant deterioration of the efficiency takes place. Specifically, deflection losses can be substantially avoided or completely prevented.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Anspruch 1 angegebenen BrennStoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements of the fuel injection valve specified in claim 1 are possible.
In vorteilhafter Weise ist der Einströmbereich des Spritzloches abgerundet ausgestaltet, während der äußere Lochbereich scharfkantig und gratfrei ausgestaltet ist. Dabei geht der abgerundet ausgestaltete Einströmbereich vorzugsweise gleichmäßig und kantenfrei in eine Ventilsitzfläche über. Dadurch wird ein weitgehend verlustfreies Einströmen von Brennstoff in das Spritzloch erzielt und ein zumindest weitgehend verlustfreies Abspritzen im äußeren Lochbereich ermöglicht.Advantageously, the inflow region of the injection hole is rounded, while the outer hole region is sharp-edged and free of burrs. In this case, the rounded-off inflow region preferably proceeds uniformly and without edges into a valve seat surface. As a result, a largely loss-free flow of fuel is achieved in the spray hole and allows at least largely loss-free spraying in the outer hole area.
Ferner ist es vorteilhaft, dass eine Wand des Spritzloches so ausgestaltet ist, dass eine in Strömungsrichtung entlang einer Oberfläche der Wand verlaufende Strömungslinie knickfrei ausgestaltet ist. Dadurch werden Verwirbelungen im Bereich der Oberfläche der Wand des Spritzloches verhindert, wodurch Strömungsverluste verringert sind.Furthermore, it is advantageous that a wall of the spray hole is configured such that a flow line extending in the flow direction along a surface of the wall is designed kink-free. As a result, turbulence in the region of the surface of the wall of the spray hole is prevented, whereby flow losses are reduced.
Speziell ist es vorteilhaft, dass die entlang der Oberfläche der Wand verlaufende Strömungslinie S-förmig ausgestaltet ist, wobei sich die S-förmige Ausgestaltung vorzugsweise auch über den Einströmbereich und den äußeren Lochbereich erstreckt .In particular, it is advantageous that the flow line running along the surface of the wall is S-shaped is, wherein the S-shaped configuration preferably also extends over the inflow region and the outer hole region.
Vorteilhaft ist es, dass eine senkrecht zu einer in Strömungsrichtung orientierten Achse des Spritzlochs liegende Querschnittsfläche des Spritzlochs entlang der Achse in der Strömungsrichtung kontinuierlich abnimmt. Somit wird eine stetige Verengung des Spritzloches in Strömungsrichtung erzielt, die zumindest in einem mittleren Abschnitt gleichmäßig verlaufen kann. Dadurch kann der Wirkungsgrad optimiert werden. Ferner ist es vorteilhaft, dass die Querschnittsfläche im äußeren Lochbereich entlang der Achse in der Strömungsrichtung relativ stark ausgeprägt abnimmt. Dabei kann die Abnahme der Querschnittsfläche in einem mittleren Bereich zwischen dem Einströmbereich und dem äußeren Lochbereich in der Strömungsrichtung gleichmäßig abnehmen, wobei die Abnahme der Querschnittsfläche in der Strömungsrichtung in dem mittleren Bereich vorzugsweise relativ schwach ausgeprägt ist. Dadurch kann eine Umlenkung erzielt werden, die im mittleren Bereich zu der Achse hin erfolgt und im äußeren Lochbereich stärker ausgeprägt ist. Dadurch kann eine düsennahe Zerstäubung bei einem hohen Wirkungsgrad erzielt werden.It is advantageous that a cross-sectional area of the injection hole perpendicular to an axis oriented in the flow direction of the injection hole decreases continuously along the axis in the flow direction. Thus, a continuous narrowing of the spray hole is achieved in the flow direction, which can run uniformly, at least in a central portion. As a result, the efficiency can be optimized. Furthermore, it is advantageous that the cross-sectional area decreases relatively strongly in the outer hole area along the axis in the flow direction. In this case, the decrease in the cross-sectional area in a middle region between the inflow region and the outer hole region in the flow direction may decrease uniformly, wherein the decrease of the cross-sectional area in the flow direction in the central region is preferably relatively weak. As a result, a deflection can be achieved, which takes place in the middle region towards the axis and is more pronounced in the outer hole region. As a result, nozzle-near atomization can be achieved with high efficiency.
Ferner ist es vorteilhaft, dass im äußeren Lochbereich des Spritzlochs eine Abrisskante vorgesehen ist, die auf die Achse des Spritzlochs gerichtet ist. Dadurch kann die Zerstäubung des abgespritzten Brennstoffs verbessert werden.Furthermore, it is advantageous that a tear-off edge is provided in the outer hole region of the injection hole, which is directed onto the axis of the injection hole. As a result, the atomization of the sprayed fuel can be improved.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Bevorzugte Ausführungsbeispiele der Erfindung sind in der nachfolgenden Beschreibung anhand der beigefügten Zeichnungen, in denen sich entsprechende Elemente mit übereinstimmenden Bezugszeichen versehen sind, näher erläutert. Es zeigt:Preferred embodiments of the invention are in the following description with reference to the accompanying drawings, in which corresponding elements are provided with matching reference numerals, explained in more detail. It shows:
Fig. 1 eine schematische Darstellung eines Brennstoffeinspritzventils in einer auszugsweisen Schnittdarstellung entsprechend einem Ausführungsbeispiel der Erfindung undFig. 1 is a schematic representation of a fuel injection valve in a partial sectional view according to an embodiment of the invention and
Fig. 2 den in Fig. 1 mit II bezeichneten Ausschnitt in weiterem Detail.Fig. 2 the designated in Fig. 1 with II cutout in more detail.
Ausführungsformen der ErfindungEmbodiments of the invention
Fig. 1 zeigt ein Brennstoffeinspritzventil 1 in einer schematischen, auszugsweisen Schnittdarstellung entsprechend einem Ausführungsbeispiel der Erfindung. Das Brennstoffeinspritzventil 1 kann insbesondere als Injektor für Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen dienen. Ein bevorzugter Einsatz des Brennstoffeinspritzventils 1 besteht für eine Brennstoffeinspritzanlage mit einem Common-Rail, das Dieselbrennstoff unter hohem Druck zu mehreren Brennstoffeinspritzventilen 1 führt. Das erfindungsgemäße Brennstoffeinspritzventil 1 eignet sich jedoch auch für andere Anwendungsfälle.Fig. 1 shows a fuel injection valve 1 in a schematic, partial sectional view according to an embodiment of the invention. The fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines. A preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1. However, the fuel injection valve 1 according to the invention is also suitable for other applications.
Das in der Fig. 1 auszugsweise dargestellteThe excerpts shown in Fig. 1
Brennstoffeinspritzventil 1 weist einen Düsenkörper 2 auf, in dem eine Düsennadel 3 axial verschiebbar gelagert ist. Die Düsennadel 3 ist dabei mittels einer Betätigungseinrichtung 4 betätigbar. Die Betätigungseinrichtung 4 kann beispielsweise mechanische und hydraulische Komponenten aufweisen, wobei die Ansteuerung mittels eines piezoelektrischen Aktors oder eines Magnetventils erfolgen kann. Die Einwirkung der Betätigungseinrichtung 4 auf die Düsennadel 3 ist durch den Doppelpfeil 5 veranschaulicht.Fuel injection valve 1 has a nozzle body 2, in which a nozzle needle 3 is mounted axially displaceable. The nozzle needle 3 is actuated by means of an actuator 4. The actuator 4 may, for example have mechanical and hydraulic components, wherein the control can be effected by means of a piezoelectric actuator or a solenoid valve. The action of the actuating device 4 on the nozzle needle 3 is illustrated by the double arrow 5.
Das Brennstoffeinspritzventil 1 ist auf geeignete Weise mit einer Brennstoffpumpe verbunden, beispielsweise über ein Common-Rail. Im Betrieb des Brennstoffeinspritzventils 1 befindet sich daher in einem innerhalb des Düsenkörpers 2 vorgesehenen Brennstoffräum 6 unter hohem Druck stehender Brennstoff .The fuel injection valve 1 is suitably connected to a fuel pump, for example via a common rail. During operation of the fuel injection valve 1, therefore, there is fuel under high pressure in a fuel space 6 provided inside the nozzle body 2.
Der Düsenkörper 2 weist eine Ventilsitzfläche 7 auf, die mit einem Ventilschließkörper 8 der Düsennadel 3 zu einem Dichtsitz zusammenwirkt. In diesem Ausführungsbeispiel ist der Dichtsitz an einer Dichtkante 9 der Ventilsitzfläche 7 gebildet. Stromabwärts der Dichtkante 9 weist der Düsenkörper 2 zumindest ein Spritzloch 15 auf. Das Spritzloch 15 ist in diesem Ausführungsbeispiel als Sacklochdüsen-Spritzloch 15 ausgestaltet. Das Spritzloch 15 kann bei einem entsprechend ausgestalteten Brennstoffeinspritzventil 1 auch als Sitzlochdüsen-Spritzloch ausgestaltet sein.The nozzle body 2 has a valve seat surface 7 which cooperates with a valve closing body 8 of the nozzle needle 3 to form a sealing seat. In this embodiment, the sealing seat is formed on a sealing edge 9 of the valve seat surface 7. Downstream of the sealing edge 9, the nozzle body 2 has at least one injection hole 15. The injection hole 15 is configured in this embodiment as a blind-hole injection port 15. The spray hole 15 may be configured as a seat hole nozzle injection hole in a suitably designed fuel injector 1.
Das Spritzloch 15 weist einen Einströmbereich 16, einen mittleren Bereich 17 und einen äußeren Lochbereich 18 auf. Dabei liegt der mittlere Bereich 17 zwischen dem Einströmbereich 16 und dem äußeren Lochbereich 18 des Spritzlochs 15. Das Spritzloch 15 ist in dem Einströmbereich 16 abgerundet ausgestaltet. Ferner weist das Spritzloch 15 in dem äußeren Lochbereich 18 eine Verjüngung auf.The injection hole 15 has an inflow region 16, a central region 17 and an outer hole region 18. In this case, the middle region 17 is located between the inflow region 16 and the outer hole region 18 of the injection hole 15. The injection hole 15 is rounded in the inflow region 16. Furthermore, the injection hole 15 in the outer hole portion 18 has a taper.
Das Spritzloch 15 ist auch in dem äußeren Lochbereich 18 abgerundet ausgestaltet. Insgesamt ist eine Wand 19 des Spritzlochs 15 so ausgestaltet, dass in einer Oberfläche 20 der Wand 19 keine Stufen, Kanten, Knicke oder dergleichen ausgebildet sind. Die Oberfläche 20 der Wand 19 ist somit zumindest im Wesentlichen glatt und gleichmäßig ausgestaltet. Die Ausgestaltung des Spritzlochs 15 ist im folgenden auch anhand der Fig. 2 im weiteren Detail beschrieben.The injection hole 15 is also in the outer hole area 18th rounded out. Overall, a wall 19 of the injection hole 15 is designed so that no steps, edges, kinks or the like are formed in a surface 20 of the wall 19. The surface 20 of the wall 19 is thus at least substantially smooth and uniform. The design of the injection hole 15 is described below in reference to FIG. 2 in further detail.
Fig. 2 zeigt den in Fig. 1 mit II bezeichneten Ausschnitt des Düsenkörpers 2 des Brennstoffeinspritzventils 1 in einer schematischen Schnittdarstellung.FIG. 2 shows the section of the nozzle body 2 of the fuel injection valve 1 designated II in FIG. 1 in a schematic sectional illustration.
Das Spritzloch 15 weist eine Achse 25 auf, wobei die Achse 25 zumindest näherungsweise in einer Strömungsrichtung 26 orientiert ist. Das Spritzloch 15 ist zumindest näherungsweise symmetrisch bezüglich der Achse 25 ausgestaltet .The injection hole 15 has an axis 25, wherein the axis 25 is oriented at least approximately in a flow direction 26. The injection hole 15 is at least approximately symmetrical with respect to the axis 25 configured.
In der Fig. 2 ist exemplarisch eine Strömungslinie 27 dargestellt, die entlang der Oberfläche 20 der Wand 19 des Spritzloches 15 verläuft. Dabei ist anzumerken, dass die Strömungslinie 27 nicht in der in der Fig. 2 dargestellten Schnittebene verläuft, da sie in der Oberfläche 20 der Wand 19 liegt.FIG. 2 shows by way of example a flow line 27 which runs along the surface 20 of the wall 19 of the spray hole 15. It should be noted that the flow line 27 does not extend in the sectional plane shown in FIG. 2, since it lies in the surface 20 of the wall 19.
Die Strömungslinie 27 ist knickfrei ausgestaltet. Dadurch ist die Strömungslinie 27 sowohl stetig, das heißt ohne Stufen, als auch gleichmäßig, das heißt ohne abrupte Richtungsänderungen entlang ihres Weges, entlang der Oberfläche 20 der Wand 19 geführt. Dadurch werden insbesondere Verwirbelungen verringert oder ganz verhindert. Dadurch kann ein hoher Wirkungsgrad beim Durchströmen des Spritzloches 15 mit Brennstoff erzielt werden. In der Fig. 2 ist exemplarisch eine Querschnittsfläche 28 veranschaulicht, die senkrecht zu der Achse 25 des Spritzloches 15 orientiert ist. Die Querschnittsfläche 28 des Spritzloches 15 kann beispielsweise zumindest näherungsweise kreis- oder ellipsenförmig ausgestaltet sein. Das Spritzloch 15 ist so ausgestaltet, dass die Querschnittsfläche 28 entlang der Achse 25 in der Strömungsrichtung 26 abnimmt. Diese Abnahme erfolgt dabei kontinuierlich, wobei beispielsweise ein Durchmesser der Querschnittsfläche 28 kontinuierlich abnimmt oder zumindest eine der beiden Hauptachsen einer elliptischen Querschnittsfläche 28 stetig reduziert wird.The flow line 27 is designed kink-free. As a result, the flow line 27 is both continuous, that is, without steps, as well as even, that is, without abrupt changes in direction along their path, along the surface 20 of the wall 19 out. As a result, in particular turbulences are reduced or completely prevented. As a result, a high efficiency can be achieved when flowing through the spray hole 15 with fuel. FIG. 2 illustrates by way of example a cross-sectional area 28 which is oriented perpendicular to the axis 25 of the spray hole 15. The cross-sectional area 28 of the spray hole 15 may be configured, for example, at least approximately circular or elliptical. The injection hole 15 is designed such that the cross-sectional area 28 decreases along the axis 25 in the flow direction 26. This decrease takes place continuously, wherein, for example, a diameter of the cross-sectional area 28 decreases continuously or at least one of the two main axes of an elliptical cross-sectional area 28 is steadily reduced.
In dem Einströmbereich 16 nimmt die Querschnittsfläche 28 zunächst relativ stark ab. Ferner ist in einem mittleren Bereich 17 des Spritzloches 15 die Abnahme der Querschnittsfläche 28 relativ schwach ausgeprägt. In dem äußeren Lochbereich 18 ist die Abnahme der Querschnittsfläche 28 in der Strömungsrichtung 26 entlang der Achse 25 wieder relativ stark ausgeprägt. Somit ergibt sich eine S-förmige Ausgestaltung der Strömungslinien des Spritzloches 15, insbesondere der Strömungslinie 27. Dies ermöglicht eine vorteilhafte Durchströmung des Spritzloches 15, wobei durch die Ausgestaltung des äußeren Lochbereichs 18 eine Umlenkung erzielt ist, die zu einer düsennahen Zerstäubung des abgespritzten Brennstoffes führt.In the inflow region 16, the cross-sectional area 28 initially decreases relatively strongly. Furthermore, in a middle region 17 of the spray hole 15, the decrease in the cross-sectional area 28 is relatively weak. In the outer hole region 18, the decrease in the cross-sectional area 28 in the flow direction 26 along the axis 25 is again relatively pronounced. This results in an S-shaped configuration of the flow lines of the spray hole 15, in particular the flow line 27. This allows an advantageous flow through the spray hole 15, wherein a deflection is achieved by the configuration of the outer hole portion 18, which leads to a nozzle-near atomization of the sprayed fuel ,
Das Spritzloch 15 weist in dem äußeren Lochbereich 18 eine umlaufende Abrisskante 29 auf, die beispielsweise kreislinienförmig oder elliptisch ausgestaltet ist. Die Abrisskante 29 ist auf die Achse 25 des Spritzloches 15 gerichtet. Die Abrisskante 29 unterstützt die Zerstäubung des abgespritzten Brennstoffs. Dadurch ist eine düsennahe Zerstäubung des Brennstoffs mit hohem Wirkungsgrad möglich. Die Abrisskante 29 ist scharfkantig und gratfrei ausgestaltet .The injection hole 15 has in the outer hole region 18 on a circumferential tear-off edge 29, which is configured, for example, circular or elliptical. The tear-off edge 29 is directed onto the axis 25 of the spray hole 15. The trailing edge 29 supports the atomization of sprayed fuel. This allows a nozzle-near atomization of the fuel with high efficiency. The tear-off edge 29 is designed sharp-edged and burr-free.
Zwischen einer Außenfläche 30 des Düsenkörpers 2 und der Wand 19 im äußeren Lochbereich 18 ist in der Schnittdarstellung ein spitzer Winkel 31 ausgebildet.Between an outer surface 30 of the nozzle body 2 and the wall 19 in the outer hole area 18, an acute angle 31 is formed in the sectional view.
Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt. The invention is not limited to the described embodiments.

Claims

Ansprüche claims
1. Brennstoffeinspritzventil (1), insbesondere Injektor für Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen, mit einem Düsenkörper (2), der eine Ventilsitzfläche (7) aufweist, und einer Düsennadel (3), die mit der Ventilsitzfläche (7) zu einem Dichtsitz zusammenwirkt, um einen Brennstofffluss zu zumindest einem stromabwärts des Dichtsitzes vorgesehenen Spritzloch (15) des Düsenkörpers (2) zu steuern, dadurch gekennzeichnet, dass das Spritzloch (15) in einem Einströmbereich (16) abgerundet ausgestaltet ist und dass das Spritzloch (15) zumindest in einem äußeren Lochbereich (18) eine Verjüngung aufweist .A fuel injector (1), in particular an injector for fuel injection systems of air-compressing, auto-ignition internal combustion engines, comprising a nozzle body (2) having a valve seat surface (7) and a nozzle needle (3) cooperating with the valve seat surface (7) to form a sealing seat in order to control a fuel flow to at least one injection hole (15) of the nozzle body (2) provided downstream of the sealing seat, characterized in that the injection hole (15) is rounded in an inflow region (16) and the injection hole (15) is at least in an outer hole portion (18) has a taper.
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass das Spritzloch (15) im äußeren Lochbereich (18) scharfkantig und gratfrei ausgestaltet ist.2. Fuel injection valve according to claim 1, characterized in that the injection hole (15) in the outer hole region (18) is designed sharp-edged and free of burrs.
3. Brennstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass eine Wand (19) des Spritzloches (15) so ausgestaltet ist, dass eine in einer Strömungsrichtung (26) entlang einer Oberfläche (20) der Wand (19) verlaufende Strömungslinie (27) knickfrei ausgestaltet ist.3. Fuel injection valve according to claim 1 or 2, characterized in that a wall (19) of the spray hole (15) is designed so that in a flow direction (26) along a surface (20) of the wall (19) extending flow line (27 ) is designed kink-free.
4. Brennstoffeinspritzventil nach Anspruch 3, dadurch gekennzeichnet, dass die entlang der Oberfläche (20) der Wand (19) verlaufende Strömungslinie (27) zumindest näherungsweise S- förmig ausgestaltet ist.4. Fuel injection valve according to claim 3, characterized in that along the surface (20) of the wall (19) extending flow line (27) is configured at least approximately S-shaped.
5. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass eine senkrecht zu einer zumindest im Wesentlichen in einer Strömungsrichtung (26) orientierten Achse (25) des Spritzlochs (15) liegende Querschnittsfläche (28) des Spritzlochs (15) entlang der Achse (25) in der Strömungsrichtung (26) kontinuierlich abnimmt.5. Fuel injection valve according to one of claims 1 to 4, characterized in that a perpendicular to an at least substantially in a flow direction (26) oriented axis (25) of the injection hole (15) lying cross-sectional area (28) of the injection hole (15) along the Axis (25) in the flow direction (26) decreases continuously.
6. Brennstoffeinspritzventil nach Anspruch 5, dadurch gekennzeichnet, dass die Querschnittsfläche (28) im äußeren Lochbereich (18) entlang der Achse (25) in der Strömungsrichtung (26) relativ stark ausgeprägt abnimmt.6. Fuel injection valve according to claim 5, characterized in that the cross-sectional area (28) decreases relatively strongly in the outer hole area (18) along the axis (25) in the flow direction (26).
7. Brennstoffeinspritzventil nach Anspruch 6, dadurch gekennzeichnet, dass das Spritzloch (15) im äußeren Lochbereich (18) eine Abrisskante (29) aufweist, die auf die Achse (25) des Spritzlochs (15) gerichtet ist.7. Fuel injection valve according to claim 6, characterized in that the injection hole (15) in the outer hole region (18) has a tear-off edge (29) which is directed to the axis (25) of the injection hole (15).
8. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass eine senkrecht zu einer zumindest im Wesentlichen in einer Strömungsrichtung (26) orientierten Achse (25) des Spritzlochs (15) liegende Querschnittsfläche (28) des Spritzlochs (15) in einem mittleren Bereich (17) zwischen dem Einströmbereich (16) und dem äußeren Lochbereich (18) in der Strömungsrichtung (26) gleichmäßig abnimmt.8. Fuel injection valve according to one of claims 1 to 7, characterized in that a perpendicular to an at least substantially in a flow direction (26) oriented axis (25) of the injection hole (15) lying cross-sectional area (28) of the injection hole (15) in one middle area (17) between the Inflow region (16) and the outer hole region (18) in the flow direction (26) decreases uniformly.
9. Brennstoffeinspritzventil nach Anspruch 8, dadurch gekennzeichnet, dass die Abnahme der Querschnittsfläche (28) in der Strömungsrichtung (26) in dem mittleren Bereich (17) relativ schwach ausgeprägt ist.9. Fuel injection valve according to claim 8, characterized in that the decrease of the cross-sectional area (28) in the flow direction (26) in the central region (17) is relatively weak.
10. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das Spritzloch (15) als Sacklochdüsen-Spritzloch ausgestaltet ist.10. Fuel injection valve according to one of claims 1 to 9, characterized in that the injection hole (15) is designed as a blind-hole injection hole.
11. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das Spritzloch (15) als Sitzlochdüsen-Spritzloch ausgestaltet ist. 11. Fuel injection valve according to one of claims 1 to 9, characterized in that the injection hole (15) is designed as a seat hole nozzle injection hole.
EP09780220.1A 2008-08-29 2009-07-07 Fuel injection valve Not-in-force EP2329133B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008041676A DE102008041676A1 (en) 2008-08-29 2008-08-29 Fuel injector
PCT/EP2009/058556 WO2010023012A1 (en) 2008-08-29 2009-07-07 Fuel injection valve

Publications (2)

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EP2329133A1 true EP2329133A1 (en) 2011-06-08
EP2329133B1 EP2329133B1 (en) 2014-09-10

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EP09780220.1A Not-in-force EP2329133B1 (en) 2008-08-29 2009-07-07 Fuel injection valve

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US (1) US20110155826A1 (en)
EP (1) EP2329133B1 (en)
CN (1) CN102132029A (en)
DE (1) DE102008041676A1 (en)
WO (1) WO2010023012A1 (en)

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AT512423A1 (en) * 2012-02-07 2013-08-15 Bosch Gmbh Robert INJECTION NOZZLE FOR INJECTING MEDIA TO THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE
JP5959892B2 (en) 2012-03-26 2016-08-02 日立オートモティブシステムズ株式会社 Spark ignition type fuel injection valve
JP2014196702A (en) * 2013-03-29 2014-10-16 株式会社日本自動車部品総合研究所 Fuel injection nozzle
DE102015205423A1 (en) 2015-03-25 2016-09-29 Robert Bosch Gmbh Fuel injection valve for internal combustion engines and use of the fuel injection valve
JP7124351B2 (en) * 2018-03-08 2022-08-24 株式会社デンソー Fuel injection valve and fuel injection system
JP7206601B2 (en) * 2018-03-08 2023-01-18 株式会社デンソー Fuel injection valve and fuel injection system
DE102018207717A1 (en) * 2018-05-17 2019-11-21 Robert Bosch Gmbh Apparatus for generating a high pressure fluid jet

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US3717305A (en) * 1970-12-10 1973-02-20 H Hedges Fuel injection nozzle assembly
DE19925380A1 (en) * 1999-06-02 2000-12-07 Volkswagen Ag Fuel injection valve for internal combustion engines
DE10105674A1 (en) * 2001-02-08 2002-08-29 Siemens Ag Fuel injection nozzle for an internal combustion engine
DE10124748A1 (en) * 2001-05-21 2003-02-27 Bosch Gmbh Robert Fuel injector
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DE102008041676A1 (en) 2010-03-04
CN102132029A (en) 2011-07-20
WO2010023012A1 (en) 2010-03-04
EP2329133B1 (en) 2014-09-10
US20110155826A1 (en) 2011-06-30

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