EP2923065B1 - Fuel injection device for an combustion engine - Google Patents

Fuel injection device for an combustion engine Download PDF

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Publication number
EP2923065B1
EP2923065B1 EP13780156.9A EP13780156A EP2923065B1 EP 2923065 B1 EP2923065 B1 EP 2923065B1 EP 13780156 A EP13780156 A EP 13780156A EP 2923065 B1 EP2923065 B1 EP 2923065B1
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EP
European Patent Office
Prior art keywords
needle
armature
longitudinal axis
injection device
hole
Prior art date
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Application number
EP13780156.9A
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German (de)
French (fr)
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EP2923065A1 (en
Inventor
Bernhard Maier
Norbert Klauer
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP2923065A1 publication Critical patent/EP2923065A1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/29—Fuel-injection apparatus having rotating means

Definitions

  • the invention relates to an injection device, with a needle and an armature, which is so in communication with the needle, that by movement of the armature movement of the needle can be generated, wherein the armature has at least one through hole through which fuel to a needle tip is leitbar ,
  • the EP 1 347 472 A2 relates to an armature and an armature drive device in which the armature is rotated about its axis to prevent the occurrence of uneven wear between the armature and a housing.
  • the present invention has for its object to provide an injection device which overcomes the disadvantages shown in the prior art. It is a particular object of the invention to provide an injection device with high reliability and reliability, in which at the same time a high density of the system is given.
  • the invention proposes an injection device for an internal combustion engine, with a needle, wherein the armature is in operative connection with the needle, that movement of the armature can be generated by a movement of the armature, wherein the armature has at least one through-hole, through the fuel to a needle tip is leitbar.
  • the injection device may be characterized in that a longitudinal axis of the needle and a longitudinal axis of the through hole are aligned with each other askew.
  • the sealing surface is constantly freed from contamination by the angular momentum of the needle.
  • the through-bore may comprise an inlet opening and an outlet opening in the anchor, wherein the distance of the inlet opening to the longitudinal axis of the needle is smaller than the distance of the outlet opening to the longitudinal axis of the needle.
  • the longitudinal axis of the throughbore lies in a plane which is aligned parallel to the longitudinal axis of the needle and forms an acute angle with a tangent plane of a circular path extending around the longitudinal axis of the needle.
  • the armature may be rotatably mounted on the needle.
  • the armature is rotatably disposed about the needle around, wherein the needle is provided in a centrally disposed bore of the armature.
  • This positioning of the needle in the anchor results in a symmetrical overall structure, which can produce particularly uniform and reproducible rotational movements of the armature and thus also the needle.
  • the injection device is designed as Spuleninjektor.
  • the armature may have a plurality of through-bores, the inlet openings and outlet openings are arranged radially on a circular path about a centrally located in the armature longitudinal axis of the needle, wherein the longitudinal axis of the through hole with a tangential plane of the circular path includes an acute angle.
  • the angle between the tangential plane of the circular path and the longitudinal axis of the through hole may be in the range of + 45 ° to -45 °, preferably in the range of + 30 ° to -30 ° and particularly preferably in the range of + 15 ° to -15 °.
  • the fuel jet exits the through-bore and exerts an ideal effect on the armature so that optimum rotation of the armature about the longitudinal axis of the needle is created.
  • the injection device 10 has a housing 15 in which an armature 13 is provided.
  • the armature 13 comprises a central bore 13a, through which a needle 11 is guided.
  • the needle 11 has stops 12a and 12b and a needle tip 11a, which in FIG. 1 is shown at the lower end of the needle 11.
  • outlet openings 18 are provided, through which fuel is conveyed out of the interior of the housing 15 when the needle 11 is in an open position.
  • a coil 16 For actuating the injection device 10, ie for transferring the needle 11 from a closed to an open position, a coil 16 energized. This generates a magnetic field which is amplified by the cores 17. As a result, the armature 13 along the double arrow F in FIG. 1 attracted to the top. During this movement, the armature 13 comes into touching contact with the upper stop element 12a and takes the needle 11 with it. The upward movement of the needle 11 and the armature 13 is stopped when the armature 13 comes to rest against the core 17. Alternatively, other suitable stop elements may be provided to stop the movement of the armature 13. To return the needle 11 in a closed position, the energization of the coil 16 is suppressed and thus interrupted the magnetic field.
  • the spring 19 then exerts a spring force on the upper stop element 12a and thus presses the needle 11 in the closed position.
  • the needle tip 11a strikes the housing 15, in the areas which are marked with the letter E, in FIG. 1 , This results in a substantially annular sealing surface between the needle tip 11a and housing 15th
  • the spring 19 may also act directly on the armature 13.
  • the armature 13 moves down and comes into touching contact with the lower stopper member 12 b.
  • the armature 13 takes with its movement the needle 11 and transfers it to the closed position.
  • FIG. 1 is a sectional view of the injector along the cutting plane AA FIG. 2 and FIG. 2 a sectional view taken along the sectional plane BB FIG. 1 ,
  • the flow holes 14a, 14b are aligned so that their axial direction is aligned parallel to a central axis H of the needle 11 and the central bore 13a.
  • FIG. 3 is a sectional view along the sectional plane CC, in which the longitudinal axis I of the through hole 14a is located, from FIG. 4 , As can be seen, the through-hole 14a extends obliquely through the armature 13.
  • the axial direction, ie the longitudinal axis I of the flow bore 14a is skewed with respect to the longitudinal axis H passing through the center of the needle 11.
  • the longitudinal axis H simultaneously represents the central axis of the central bore 13a in the armature 13, through which the needle 11 extends.
  • the inlet opening of the flow hole 14a, the in FIG. 3 is shown in the upper region of the armature 13, is closer to the longitudinal axis H than the outlet opening of the flow hole 14 a, the in FIG. 3 is shown in the lower region of the armature 13.
  • the distance a of the inlet opening to the central axis H is thus smaller than the distance b of the outlet opening of the flow bore 14a to the central axis H.
  • the distances a and b are respectively measured from the center of the inlet opening and from the center of the outlet opening to the central axis H.
  • An outlet opening is in FIG. 4 represented by the dashed circle with the center M A.
  • FIG. 4 a particularly preferred embodiment of the invention shown.
  • the longitudinal axis I of the flow bore 14a extends in the sectional plane CC, which is aligned parallel to the longitudinal axis H of the needle 11.
  • the sectional plane CC, and consequently also the longitudinal axis I of the flow bore forms an angle ⁇ with a tangential plane T, which runs tangentially to the circular path K and intersects the plane CC at the center M E of the inlet openings of the through-bore 14a.
  • This angle ⁇ is in the range of ⁇ 45 °, preferably in the range of ⁇ 30 ° and particularly preferably in the range of ⁇ 15 °, relative to the tangent plane TDh the angle of the longitudinal axis I of the through hole 14a can, for example, + 15 ° or - Deviate 15 ° from the tangential plane T.
  • the fuel ie essentially diesel or gasoline
  • the fuel is - as with reference to FIG. 1 described - guided over a fuel line into the chamber 20, fills the through hole 14 a, as well as lying under the armature 13 tapered region and is pressurized there before.
  • Via a coil 16 a magnetic field is generated by means of the cores 17, which sets the armature 13 in motion.
  • the armature 13 thereby moves along the double arrow F upwards.
  • the fuel flows from the common chamber 20 through the flow holes 14a, 14b in the tapered region below the armature 13, past the needle tip 11a and passes through the in FIG. 3 not shown outlet openings 18 out of the injection device 10 out.
  • a rotational movement of the armature 13 is permanently generated and thus permanently a rotational movement of the needle 11.
  • the needle 11 is transferred from an open position to a closed, keeps the rotational movement due to the inertia to the moment in which the needle tip 11 amit the inner housing 5 at. This rotational movement is stopped at the time when the needle tip strikes the region E in the interior of the housing 15. As a result, each time the needle 11 strikes, the sealing surface or the sealing region E is cleaned of impurities.

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

Description

Die Erfindung betrifft eine Einspritzvorrichtung, mit einer Nadel und einem Anker, welcher derart mit der Nadel in Verbindung steht, dass durch Bewegung des Ankers eine Bewegung der Nadel erzeugbar ist, wobei der Anker mindestens eine Durchgangsbohrung aufweist, durch die Treibstoff zu einer Nadelspitze leitbar ist.The invention relates to an injection device, with a needle and an armature, which is so in communication with the needle, that by movement of the armature movement of the needle can be generated, wherein the armature has at least one through hole through which fuel to a needle tip is leitbar ,

Zum Betrieb von Verbrennungsmotoren werden Treibstoff und Luft vermischt und gezündet, wobei die im Treibstoff gespeicherte Energie in mechanische Arbeit umgewandelt wird und dann zum Vortrieb eines Kraftfahrzeugs genutzt wird. Zum Zuführen des Treibstoffs zur Luft werden Einspritzeinheiten verwendet, die entweder im Ansaugtrakt oder im Brennraum des Verbrennungsmotors angeordnet sind. Aus dem Stand der Technik sind dazu mechanische Einspritzvorrichtungen, piezoelektrische Injektoren sowie Spuleninjektoren bekannt. Im Inneren eines Injektorgehäuses ist dabei eine Nadel vorgesehen, mit der Austrittsöffnungen, die in einem Gehäuse vorgesehen sind, geöffnet und verschlossen werden können. Im Allgemeinen bewegt sich die Nadel in einer linearen Bewegungsrichtung aus einer offenen Stellung in eine geschlossene Stellung und umgekehrt, so dass im geöffneten Zustand der Treibstoff durch die Austrittsöffnungen hindurchfließen kann und der Luft beigemischt wird.For the operation of internal combustion engines fuel and air are mixed and ignited, wherein the energy stored in the fuel is converted into mechanical work and is then used to propel a motor vehicle. For supplying the fuel to the air injection units are used, which are arranged either in the intake tract or in the combustion chamber of the internal combustion engine. Mechanical injectors, piezoelectric injectors and Spuleninjektoren are known from the prior art. Inside a Injektorgehäuses while a needle is provided with the outlet openings, which are provided in a housing, can be opened and closed. In general, the needle moves in a linear direction of movement from an open position to a closed position and vice versa, so that in the open state, the fuel can flow through the outlet openings and the air is mixed.

Aus der US 3,567,135 ist ein elektromagnetisch betätigbares Einspritzventil für zeitgesteuerte Niederdruck-Kraftstoffeinspritzanlagen, insbesondere von solchen mit Saugrohreinspritzung, bekannt, mit einem von einer Wicklung umgebenen Eisenkern und einem zu diesem gleichachsig zwischen dem Eisenkern und einer Düsenplatte angeordneten Flachanker.From the US 3,567,135 is an electromagnetically actuated injection valve for timed low-pressure fuel injection systems, in particular of those with intake manifold injection, known with one of a winding surrounded iron core and an equiaxed to this between the iron core and a nozzle plate flat armature.

Die EP 1 347 472 A2 betrifft einen Anker und eine Ankerantriebsvorrichtung, bei der der Anker um seine Achse gedreht wird, um das Auftreten eines ungleichmäßigen Verschleißes zwischen dem Anker und einem Gehäuse zu verhindern.The EP 1 347 472 A2 relates to an armature and an armature drive device in which the armature is rotated about its axis to prevent the occurrence of uneven wear between the armature and a housing.

Solche Systeme haben jedoch den Nachteil, dass im geschlossenen Zustand der Einspritzvorrichtung die Nadel auf der gleichen Stelle des Gehäuses zum Aufliegen kommt. Verunreinigungen, beispielsweise Partikel, die im Treibstoff mitgeführt werden, werden dabei von der Nadel an die innere Wand des Gehäuses gedrückt. Diese Verunreinigungen lagern sich somit auf der Dichtfläche zwischen Nadel und Gehäuse ab und führen zu Undichtigkeiten der Einspritzvorrichtung. Dadurch kann auch im geschlossenen Zustand der Nadel weiterhin Treibstoff durch die Austrittsöffnungen gelangen. Dies stört den Normalbetrieb des Motors und führt zu einem erhöhten Verbrauch des Fahrzeugs.However, such systems have the disadvantage that in the closed state of the injection device, the needle in the same position of the housing for Resting comes. Contaminants, such as particles that are carried in the fuel, are thereby pressed by the needle to the inner wall of the housing. These impurities are thus deposited on the sealing surface between the needle and the housing and lead to leaks in the injector. As a result, fuel can continue to pass through the outlet openings even when the needle is closed. This interferes with the normal operation of the engine and leads to increased consumption of the vehicle.

Die vorliegende Erfindung macht es sich zur Aufgabe, eine Einspritzvorrichtung anzugeben, welche die im Stand der Technik gezeigten Nachteile überwindet. Es ist eine besondere Aufgabe der Erfindung, eine Einspritzvorrichtung anzugeben mit hoher Zuverlässigkeit und Funktionssicherheit, bei der gleichzeitig eine hohe Dichtigkeit des Systems gegeben ist.The present invention has for its object to provide an injection device which overcomes the disadvantages shown in the prior art. It is a particular object of the invention to provide an injection device with high reliability and reliability, in which at the same time a high density of the system is given.

Diese Aufgabe wird durch eine Vorrichtung mit den Merkmalen des unabhängigen Anspruchs gelöst. Die abhängigen Ansprüche stellen vorteilhafte Ausführungsformen der Erfindung dar.This object is achieved by a device having the features of the independent claim. The dependent claims represent advantageous embodiments of the invention.

Zur Lösung dieser Aufgabe schlägt die Erfindung eine Einspritzvorrichtung für einen Verbrennungsmotor vor, mit einer Nadel, wobei der Anker derart mit der Nadel in Wirkverbindung steht, dass durch eine Bewegung des Ankers eine Bewegung der Nadel erzeugbar ist, wobei der Anker mindestens eine Durchgangsbohrung aufweist, durch die Treibstoff zu einer Nadelspitze leitbar ist. Darüber hinaus kann die Einspritzvorrichtung dadurch gekennzeichnet sein, dass eine Längsachse der Nadel und eine Längsachse der Durchgangsbohrung zueinander windschief ausgerichtet sind. Durch diese schräge Ausrichtung der Durchgangsbohrung durch den Anker erzeugt der Durchfluss des Treibstoffs ein um die Längsachse der Nadel wirkendes Drehmoment auf den Anker. Dieses Moment wird durch Reibung auf die Nadel übertragen, wodurch eine Drehbewegung der Nadel erzeugt wird.To achieve this object, the invention proposes an injection device for an internal combustion engine, with a needle, wherein the armature is in operative connection with the needle, that movement of the armature can be generated by a movement of the armature, wherein the armature has at least one through-hole, through the fuel to a needle tip is leitbar. In addition, the injection device may be characterized in that a longitudinal axis of the needle and a longitudinal axis of the through hole are aligned with each other askew. As a result of this oblique orientation of the passage bore through the armature, the flow of the fuel produces a torque acting on the armature about the longitudinal axis of the needle. This moment is transmitted by friction to the needle, whereby a rotational movement of the needle is generated.

Beim Schließvorgang wird durch den Drehimpuls der Nadel die Dichtfläche ständig von Verunreinigungen freigerieben.During the closing process, the sealing surface is constantly freed from contamination by the angular momentum of the needle.

Weiterhin kann die Durchgangsbohrung eine Einlassöffnung und eine Auslassöffnung im Anker umfassen, wobei der Abstand der Einlassöffnung zur Längsachse der Nadel kleiner ist als der Abstand der Auslassöffnung zur Längsachse der Nadel. Dadurch liegt die Längsachse der Durchgangsbohrung in einer Ebene, die parallel zur Längsachse der Nadel ausgerichtet ist und mit einer Tangentenebene einer Kreisbahn, die um die Längsachse der Nadel herum verläuft, einen spitzen Winkel einschließt. Durch die Ausrichtung der Durchgangsbohrung kann beim Öffnen der Einspritzvorrichtung, d.h. in dem Moment, wenn die Nadel die Auslassöffnung der Einspritzvorrichtung freigibt, ein Drehimpuls auf den Anker ausgeübt werden.Furthermore, the through-bore may comprise an inlet opening and an outlet opening in the anchor, wherein the distance of the inlet opening to the longitudinal axis of the needle is smaller than the distance of the outlet opening to the longitudinal axis of the needle. As a result, the longitudinal axis of the throughbore lies in a plane which is aligned parallel to the longitudinal axis of the needle and forms an acute angle with a tangent plane of a circular path extending around the longitudinal axis of the needle. Through the orientation of the through-hole, when opening the injector, i. at the moment when the needle releases the injector outlet, an angular momentum is applied to the armature.

Darüber hinaus kann der Anker drehbar an der Nadel angeordnet sein.In addition, the armature may be rotatably mounted on the needle.

Erfindungsgefäß ist der Anker drehbar um die Nadel herum angeordnet sein, wobei die Nadel in einer mittig angeordneten Bohrung des Ankers vorgesehen ist. Durch diese Positionierung der Nadel in dem Anker ergibt sich ein symmetrischer Gesamtaufbau, wodurch sich besonders gleichmäßige und reproduzierbare Drehbewegungen des Ankers und somit auch der Nadel erzeugen lassen.Invention vessel, the armature is rotatably disposed about the needle around, wherein the needle is provided in a centrally disposed bore of the armature. This positioning of the needle in the anchor results in a symmetrical overall structure, which can produce particularly uniform and reproducible rotational movements of the armature and thus also the needle.

In einer bevorzugten Ausführungsform der Erfindung ist die Einspritzvorrichtung als Spuleninjektor ausgebildet.In a preferred embodiment of the invention, the injection device is designed as Spuleninjektor.

Darüber hinaus kann der Anker eine Mehrzahl von Durchgangsbohrungen aufweisen, deren Einlassöffnungen und Auslassöffnungen radial auf einer Kreisbahn um eine mittig im Anker liegende Längsachse der Nadel angeordnet sind, wobei die Längsachse der Durchgangsbohrung mit einer Tangentialebene der Kreisbahn einen spitzen Winkel einschließt. Durch Vorsehen von mehreren Durchgangsbohrungen kann eine besonders gute und bei jedem Einspritzvorgang wiederholbare Drehbewegung des Ankers und damit der Nadel realisiert werden.In addition, the armature may have a plurality of through-bores, the inlet openings and outlet openings are arranged radially on a circular path about a centrally located in the armature longitudinal axis of the needle, wherein the longitudinal axis of the through hole with a tangential plane of the circular path includes an acute angle. By Providing a plurality of through holes, a particularly good and repeatable during each injection operation rotational movement of the armature and thus the needle can be realized.

Der Winkel zwischen der Tangentialebene der Kreisbahn und der Längsachse der Durchgangsbohrung kann im Bereich von + 45° bis -45°, bevorzugt im Bereich von +30° bis -30° und besonders bevorzugt im Bereich von +15° bis -15° liegen. In diesem Bereich tritt der Treibstoffstrahl aus der Durchgangsbohrung aus und übt eine ideale Wirkung auf den Anker aus, so dass eine optimale Drehbewegung des Ankers um die Längsachse der Nadel erzeugt wird.The angle between the tangential plane of the circular path and the longitudinal axis of the through hole may be in the range of + 45 ° to -45 °, preferably in the range of + 30 ° to -30 ° and particularly preferably in the range of + 15 ° to -15 °. In this area, the fuel jet exits the through-bore and exerts an ideal effect on the armature so that optimum rotation of the armature about the longitudinal axis of the needle is created.

Im Folgenden wird die Erfindung anhand der Figurenbeschreibung näher erläutert. Die Ansprüche, die Figuren und die Beschreibung enthalten eine Vielzahl von Merkmalen, die im Folgenden im Zusammenhang mit beispielhaft beschriebenen Ausführungsformen der vorliegenden Erfindung erläutert werden. Der Fachmann wird diese Merkmale auch einzeln und in anderen Kombinationen betrachten, um weitere Ausführungsformen zu bilden, die an entsprechende Anwendungen der Erfindung angepasst sind.The invention is explained in more detail below with reference to the description of the figures. The claims, the figures, and the description include a variety of features that will be discussed below in conjunction with exemplary embodiments of the present invention. The person skilled in the art will also consider these features individually and in other combinations to form further embodiments that are adapted to corresponding applications of the invention.

Der prinzipielle Aufbau einer bekannten Einspritzvorrichtung wird anhand der Figur 1 erläutert. Die Einspritzvorrichtung 10 weist ein Gehäuse 15 auf, in dem ein Anker 13 vorgesehen ist. Der Anker 13 umfasst eine mittige Bohrung 13a, durch die eine Nadel 11 geführt wird. Die Nadel 11 weist Anschläge 12a und 12b auf sowie eine Nadelspitze 11a, die in Figur 1 am unteren Ende der Nadel 11 dargestellt ist. In dem Gehäuse 15 sind Auslassöffnungen 18 vorgesehen, über die Treibstoff aus dem Inneren des Gehäuses 15 hinaus gefördert wird, wenn sich die Nadel 11 in einer geöffneten Position befindet.The basic structure of a known injection device is based on the FIG. 1 explained. The injection device 10 has a housing 15 in which an armature 13 is provided. The armature 13 comprises a central bore 13a, through which a needle 11 is guided. The needle 11 has stops 12a and 12b and a needle tip 11a, which in FIG. 1 is shown at the lower end of the needle 11. In the housing 15, outlet openings 18 are provided, through which fuel is conveyed out of the interior of the housing 15 when the needle 11 is in an open position.

Zum Betätigen der Einspritzvorrichtung 10, d.h. zum Überführen der Nadel 11 aus einer geschlossenen in eine geöffnete Position wird eine Spule 16 bestromt. Diese erzeugt ein Magnetfeld, welches durch die Kerne 17 verstärkt wird. Dadurch wird der Anker 13 entlang des Doppelpfeils F in Figur 1 nach oben angezogen. Bei dieser Bewegung kommt der Anker 13 in berührenden Kontakt mit dem oberen Anschlagelement 12a und nimmt die Nadel 11 mit. Die Aufwärtsbewegung der Nadel 11 und des Ankers 13 wird gestoppt, wenn der Anker 13 zur Anlage an dem Kern 17 kommt. Alternativ können auch andere geeignete Anschlagelemente vorgesehen sein, zum Stoppen der Bewegung des Ankers 13. Um die Nadel 11 wieder in eine geschlossene Position zu überführen, wird die Bestromung der Spulen 16 unterbunden und damit das Magnetfeld unterbrochen. Die Feder 19 übt dann eine Federkraft auf das obere Anschlagelement 12a aus und drückt damit die Nadel 11 in die geschlossene Position. Dabei trifft die Nadelspitze 11a auf das Gehäuse 15 auf, in den Bereichen, die mit dem Buchstaben E gekennzeichnet sind, in Figur 1. Es ergibt sich eine im Wesentlichen ringförmige Dichtfläche zwischen der Nadelspitze 11a und Gehäuse 15.For actuating the injection device 10, ie for transferring the needle 11 from a closed to an open position, a coil 16 energized. This generates a magnetic field which is amplified by the cores 17. As a result, the armature 13 along the double arrow F in FIG. 1 attracted to the top. During this movement, the armature 13 comes into touching contact with the upper stop element 12a and takes the needle 11 with it. The upward movement of the needle 11 and the armature 13 is stopped when the armature 13 comes to rest against the core 17. Alternatively, other suitable stop elements may be provided to stop the movement of the armature 13. To return the needle 11 in a closed position, the energization of the coil 16 is suppressed and thus interrupted the magnetic field. The spring 19 then exerts a spring force on the upper stop element 12a and thus presses the needle 11 in the closed position. In this case, the needle tip 11a strikes the housing 15, in the areas which are marked with the letter E, in FIG. 1 , This results in a substantially annular sealing surface between the needle tip 11a and housing 15th

Alternativ zu der dargestellten Ausführungsform kann die Feder 19 auch direkt auf den Anker 13 wirken. In diesem Fall bewegt sich der Anker 13 nach unten und gerät in berührenden Kontakt mit dem unteren Anschlagelement 12b. Dadurch nimmt der Anker 13 bei seiner Bewegung die Nadel 11 mit und überführt sie in die geschlossene Position.As an alternative to the illustrated embodiment, the spring 19 may also act directly on the armature 13. In this case, the armature 13 moves down and comes into touching contact with the lower stopper member 12 b. As a result, the armature 13 takes with its movement the needle 11 and transfers it to the closed position.

Der Pfad des Treibstoffs soll im Folgenden beschrieben werden. Der Treibstoff wird aus einer nicht dargestellten Treibstoffleitung durch die Öffnung 21 in die Kammer 20 geleitet, mit Hilfe einer Treibstoff-Förderpumpe. Aus der zentralen Kammer 20 gelangt der Treibstoff über die Durchflussbohrungen 14a, 14b in den spitz zulaufenden Bereich unterhalb des Ankers 13. Durch die Förderpumpe stellt sich ein entsprechender Druck in dem mit Treibstoff gefluteten Bereich ein. Wenn die Nadel 11 in eine geöffnete Position überführt wird, strömt aufgrund des in der Kammer 20 vorherrschenden Drucks der Treibstoff durch die Auslassöffnungen 18 in einen Brennraum oder in einen Ansaugtrakt des Verbrennungsmotors hinein. Dabei stellt sich eine Strömung ein, bei der Treibstoff aus der Kammer 20 durch die Einlassöffnung in die Durchgangsbohrung 14a, 14b und durch die Auslassöffnung aus der Durchgangsbohrung in den Bereich unterhalb des Ankers 13 fließt. Figur 1 ist eine Schnittdarstellung der Einspritzvorrichtung entlang der Schnittebene A-A aus Figur 2 und Figur 2 eine Schnittansicht entlang der Schnittebene B-B aus Figur 1.The path of the fuel will be described below. The fuel is passed from a fuel line, not shown, through the opening 21 into the chamber 20, by means of a fuel feed pump. From the central chamber 20, the fuel passes through the flow holes 14a, 14b in the tapered region below the armature 13. By the feed pump, a corresponding pressure in the flooded with fuel area. When the needle 11 is transferred to an open position, due to the pressure prevailing in the chamber 20, the fuel flows through the exhaust ports 18 into a combustion chamber or intake tract of the internal combustion engine. In this case, a flow is established in which fuel from the chamber 20 flows through the inlet opening into the through-bore 14a, 14b and through the outlet opening from the through-bore into the region below the armature 13. FIG. 1 is a sectional view of the injector along the cutting plane AA FIG. 2 and FIG. 2 a sectional view taken along the sectional plane BB FIG. 1 ,

Wie aus den Figuren 1 und 2 ersichtlich ist, sind im Stand der Technik die Durchflussbohrungen 14a, 14b so ausgerichtet, dass ihre axiale Richtung parallel zu einer Mittelachse H der Nadel 11 bzw. der mittigen Bohrung 13a ausgerichtet sind.Like from the Figures 1 and 2 As can be seen, in the prior art, the flow holes 14a, 14b are aligned so that their axial direction is aligned parallel to a central axis H of the needle 11 and the central bore 13a.

Ausgehend davon soll nun die Erfindung anhand der Figuren 3 und 4 erläutert werden, wobei gleiche Bezugszeichen wie in Figuren 1 und 2 dieselben Bauteile bezeichnen. Figur 3 ist eine Schnittansicht entlang der Schnittebene C-C, in der auch die Längsachse I der Durchgangsbohrung 14a liegt, aus Figur 4. Wie daraus ersichtlich ist, verläuft die Durchgangsbohrung 14a schräg durch den Anker 13. Mit anderen Worten: Erfindungsgemäß liegt die axiale Richtung, d.h. die Längsachse I der Durchflussbohrung 14a windschief zur Längsachse H, die durch die Mitte der Nadel 11 verläuft. Die Längsachse H stellt dabei gleichzeitig die Mittelachse der Mittenbohrung 13a in dem Anker 13 dar, durch den die Nadel 11 verläuft. D.h. die Einlassöifinung der Durchflussbohrung 14a, die in Figur 3 im oberen Bereich des Ankers 13 abgebildet ist, liegt näher an der Längsachse H als die Auslassöffnung der Durchflussbohrung 14a, die in Figur 3 im unteren Bereich des Ankers 13 abgebildet ist. Der Abstand a der Einlassöffnung zur Mittelachse H ist somit kleiner als der Abstand b der Auslassöffnung der Durchflussbohrung 14a zur Mittelachse H. Die Abstände a und b werden jeweils von dem Mittelpunkt der Einlassöffnung bzw. von dem Mittelpunkt der Auslassöffnung zu der Mittelachse H gemessen. Eine Auslassöffnung ist in Figur 4 dargestellt durch den gestrichelten Kreis mit dem Mittelpunkt MA. Zur besseren Erklärung der vorliegenden geometrischen Gegebenheiten ist in Figur 4 eine besonders bevorzugte Ausführungsform der Erfindung dargestellt. Diese weist eine Vielzahl von Durchflussbohrungen 14a, 14b auf, wobei die Einlassöffnungen allesamt auf einer Kreisbahn K angeordnet sind, deren Mittelpunkt auf der Längsachse H der Nadel 11 liegt. Die Längsachse I der Durchflussbohrung 14a verläuft in der Schnittebene C-C, die parallel zur Längsachse H der Nadel 11 ausgerichtet ist. Die Schnittebene C-C und folglich auch die Längsachse I der Durchflussbohrung schließt mit einer Tangentialebene T, welche tangential zur Kreisbahn K verläuft und die Ebene C-C im Mittelpunkt ME der Einlassöffnungen der Durchgangsbohrung 14a schneidet, einen Winkel α ein. Dieser Winkel α liegt im Bereich von ± 45°, bevorzugt im Bereich von ± 30° und besonders bevorzugt im Bereich von ± 15°, bezogen auf die Tangentialebene T. D.h. der Winkel der Längsachse I der Durchgangsbohrung 14a kann beispielsweise um +15° oder um -15° von der Tangentialebene T abweichen.Based on this, the invention is based on the FIGS. 3 and 4 are explained, wherein the same reference numerals as in Figures 1 and 2 designate the same components. FIG. 3 is a sectional view along the sectional plane CC, in which the longitudinal axis I of the through hole 14a is located, from FIG. 4 , As can be seen, the through-hole 14a extends obliquely through the armature 13. In other words, according to the invention, the axial direction, ie the longitudinal axis I of the flow bore 14a, is skewed with respect to the longitudinal axis H passing through the center of the needle 11. The longitudinal axis H simultaneously represents the central axis of the central bore 13a in the armature 13, through which the needle 11 extends. That is, the inlet opening of the flow hole 14a, the in FIG. 3 is shown in the upper region of the armature 13, is closer to the longitudinal axis H than the outlet opening of the flow hole 14 a, the in FIG. 3 is shown in the lower region of the armature 13. The distance a of the inlet opening to the central axis H is thus smaller than the distance b of the outlet opening of the flow bore 14a to the central axis H. The distances a and b are respectively measured from the center of the inlet opening and from the center of the outlet opening to the central axis H. An outlet opening is in FIG. 4 represented by the dashed circle with the center M A. For a better explanation of the present geometric conditions is in FIG. 4 a particularly preferred embodiment of the invention shown. This has a plurality of flow holes 14a, 14b, wherein the inlet openings are all arranged on a circular path K, the center of which lies on the longitudinal axis H of the needle 11. The longitudinal axis I of the flow bore 14a extends in the sectional plane CC, which is aligned parallel to the longitudinal axis H of the needle 11. The sectional plane CC, and consequently also the longitudinal axis I of the flow bore, forms an angle α with a tangential plane T, which runs tangentially to the circular path K and intersects the plane CC at the center M E of the inlet openings of the through-bore 14a. This angle α is in the range of ± 45 °, preferably in the range of ± 30 ° and particularly preferably in the range of ± 15 °, relative to the tangent plane TDh the angle of the longitudinal axis I of the through hole 14a can, for example, + 15 ° or - Deviate 15 ° from the tangential plane T.

Die Funktionsweise der vorliegenden Erfindung soll im Folgenden kurz beschrieben werden anhand der Figuren 3 und 4. Der Treibstoff, d.h. im Wesentlichen Diesel oder Benzin, wird - wie auch mit Bezug zur Figur 1 beschrieben - über eine Treibstoffleitung in die Kammer 20 geführt, füllt die Durchgangsbohrung 14a, sowie den unter dem Anker 13 liegenden spitz zulaufenden Bereich und liegt darin druckbeaufschlagt vor. Über eine Spule 16 wird ein Magnetfeld mit Hilfe der Kerne 17 erzeugt, welches den Anker 13 in Bewegung setzt. Der Anker 13 bewegt sich dabei entlang des Doppelpfeils F nach oben. Sobald die Austrittsöffnungen einen Durchfluss zulassen, wird Treibstoff durch die Durchflussbohrungen 14a, 14b geleitet, wobei beim Austritt des Treibstoffs aus den Durchgangsbohrungen 14a, 14b, dieser aus der Durchflussbohrung 14a nicht in axialer Richtung der Nadel 11, sondern in einer hierzu windschiefen Richtung austritt. Dies erzeugt ein Drehmoment auf den Anker 13, wodurch dieser in eine Drehbewegung um seine Hochachse H versetzt wird. Da der Anker 13 mit dem oberen Anschlag-element 12a in berührendem Kontakt steht, überträgt sich die Drehbewegung auch auf die Nadel 11.The operation of the present invention will be briefly described below with reference to FIGS. 3 and 4 , The fuel, ie essentially diesel or gasoline, is - as with reference to FIG. 1 described - guided over a fuel line into the chamber 20, fills the through hole 14 a, as well as lying under the armature 13 tapered region and is pressurized there before. Via a coil 16, a magnetic field is generated by means of the cores 17, which sets the armature 13 in motion. The armature 13 thereby moves along the double arrow F upwards. As soon as the outlet openings allow a flow, fuel is passed through the flow holes 14a, 14b, wherein the exit of the fuel from the through holes 14a, 14b, this emerges from the flow hole 14a not in the axial direction of the needle 11, but in a skewed direction. This generates a torque on the armature 13, causing it to rotate about its vertical axis H. Since the armature 13 with the upper stop element 12a is in touching contact, the rotational movement is also transferred to the needle 11th

Der Treibstoff fließt aus der gemeinsamen Kammer 20 durch die Durchflussbohrungen 14a, 14b in den spitz zulaufenden Bereich unterhalb des Ankers 13, an der Nadelspitze 11a vorbei und tritt durch die in Figur 3 nicht dargestellten Auslassöffnungen 18 aus der Einspritzvorrichtung 10 heraus. Dabei wird permanent eine Drehbewegung des Ankers 13 erzeugt und damit auch permanent eine Drehbewegung der Nadel 11. Wenn die Nadel 11 von einer geöffneten Position in eine geschlossene überführt wird, hält die Drehbewegung aufgrund der Massenträgheit bis zum Moment, in dem die Nadelspitze 11 amit dem inneren Gehäuses 5 an. Diese Drehbewegung wird gestoppt in dem Zeitpunkt, in dem die Nadelspitze auf den Bereich E im Inneren des Gehäuses 15 auftrifft. Dadurch wird bei jedem Auftreffen der Nadel 11 die Dichtfläche bzw. der Dichtbereich E von Verunreinigungen gesäubert.The fuel flows from the common chamber 20 through the flow holes 14a, 14b in the tapered region below the armature 13, past the needle tip 11a and passes through the in FIG. 3 not shown outlet openings 18 out of the injection device 10 out. In this case, a rotational movement of the armature 13 is permanently generated and thus permanently a rotational movement of the needle 11. When the needle 11 is transferred from an open position to a closed, keeps the rotational movement due to the inertia to the moment in which the needle tip 11 amit the inner housing 5 at. This rotational movement is stopped at the time when the needle tip strikes the region E in the interior of the housing 15. As a result, each time the needle 11 strikes, the sealing surface or the sealing region E is cleaned of impurities.

Claims (5)

  1. An injection device (10) for an internal combustion engine, comprising a needle (11) and an armature (13) which is operatively connected to the needle (11) such that a movement of the armature (13) can produce a movement of the needle (11), wherein the armature (13) has at least one through hole (14a, 14b) through which fuel can be conveyed to the tip (11 a) of the needle, wherein a longitudinal axis (H) of the needle (11) and a longitudinal axis (I) of the through hole (14a, 14b) are in a skewed orientation relative to one other, characterised in that
    the armature (13) is arranged rotatably about the needle (11), said needle (11) being provided in a centrally arranged hole (13a) in the armature (13).
  2. An injection device (10) according to claim 1, characterised in that the through hole (14a, 14b) comprises an inlet opening and an outlet opening in the armature (13), and in that the distance (a) of the inlet opening to the longitudinal axis (H) of the needle (11) is shorter than the distance (b) of the outlet opening to the longitudinal axis (H) of the needle (11).
  3. An injection device (10) according to either of the preceding claims, characterised in that
    the injection device (10) is configured as a coil injector.
  4. An injection device (10) according to any one of the preceding claims, characterised in that
    the armature (13) has a plurality of through holes (14a, 14b) which are arranged radially on a circular path around a centrally located longitudinal axis (H) of the needle (11), the longitudinal axis (I) of the through hole including an acute angle (α) with a tangential plane (T) of the circular path.
  5. An injection device (10) according to claim 4, characterised in that the angle (α) is within the range of ± 45°, preferably within the range of ± 30° and more preferably within the range of ± 15°.
EP13780156.9A 2012-11-26 2013-10-24 Fuel injection device for an combustion engine Active EP2923065B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012221524.7A DE102012221524A1 (en) 2012-11-26 2012-11-26 Injection device for an internal combustion engine
PCT/EP2013/072261 WO2014079646A1 (en) 2012-11-26 2013-10-24 Injection device for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2923065A1 EP2923065A1 (en) 2015-09-30
EP2923065B1 true EP2923065B1 (en) 2016-10-12

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EP13780156.9A Active EP2923065B1 (en) 2012-11-26 2013-10-24 Fuel injection device for an combustion engine

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US (1) US9790907B2 (en)
EP (1) EP2923065B1 (en)
CN (1) CN104685199B (en)
DE (1) DE102012221524A1 (en)
WO (1) WO2014079646A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017213417A1 (en) * 2017-08-02 2019-02-07 Robert Bosch Gmbh Electromagnetically operated valve and high-pressure fuel pump

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1601395A1 (en) * 1968-01-30 1970-10-29 Bosch Gmbh Robert Electromagnetically operated injection valve
IT1152503B (en) * 1982-08-18 1987-01-07 Alfa Romeo Spa ELECTROINJECTOR FOR A C.I. ENGINE
DE3510301A1 (en) * 1985-03-22 1986-09-25 Krupp Mak Maschinenbau Gmbh, 2300 Kiel INJECTION DEVICE FOR FUELS IN DIESEL ENGINES
DE19950761A1 (en) * 1999-10-21 2001-04-26 Bosch Gmbh Robert Fuel injection valve has supporting ring between elastomeric ring and armature that supports elastomeric ring axially near opening of fuel channel in armature and radially on shoulder
JP2005299683A (en) * 2001-11-27 2005-10-27 Bosch Corp Liquid flow control valve and needle anchor
JP4131118B2 (en) * 2002-03-20 2008-08-13 トヨタ自動車株式会社 Armature drive
JP2006017101A (en) * 2004-06-02 2006-01-19 Denso Corp Fuel injection valve
JP5239895B2 (en) * 2009-01-23 2013-07-17 株式会社デンソー Fuel injection valve
EP2322797B1 (en) * 2009-11-12 2012-10-31 Delphi Technologies Holding S.à.r.l. Armature for a Solenoid Actuator
DE102010030393A1 (en) * 2010-06-23 2011-12-29 Robert Bosch Gmbh Anchor element for magnet component of fuel injection valve of storage injection system to inject fuel into combustion chamber of internal combustion engine, has anchor plate comprising recesses that are limited by opposite edge surface
CN201874713U (en) * 2010-12-10 2011-06-22 中国第一汽车集团公司无锡油泵油嘴研究所 Oil injector
DE102011004186A1 (en) * 2011-02-16 2012-08-16 Robert Bosch Gmbh Fuel injection component has element, which is arranged in bore of guide element, where element has structured surface in area between inlet area and outlet area of bore

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Publication number Publication date
WO2014079646A1 (en) 2014-05-30
CN104685199B (en) 2017-06-27
CN104685199A (en) 2015-06-03
EP2923065A1 (en) 2015-09-30
US9790907B2 (en) 2017-10-17
DE102012221524A1 (en) 2014-05-28
US20150252762A1 (en) 2015-09-10

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