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EP2414663B1 - Fuel injection device - Google Patents

Fuel injection device Download PDF

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Publication number
EP2414663B1
EP2414663B1 EP10708536.7A EP10708536A EP2414663B1 EP 2414663 B1 EP2414663 B1 EP 2414663B1 EP 10708536 A EP10708536 A EP 10708536A EP 2414663 B1 EP2414663 B1 EP 2414663B1
Authority
EP
European Patent Office
Prior art keywords
return
fuel injection
injection device
connection
support plate
Prior art date
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Active
Application number
EP10708536.7A
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German (de)
French (fr)
Other versions
EP2414663A1 (en
Inventor
Thomas Pauer
Andreas Rettich
Markus Rueckle
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
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Publication of EP2414663A1 publication Critical patent/EP2414663A1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus

Definitions

  • the invention relates to a fuel injection device for injecting fuel into a combustion chamber of an internal combustion engine, with a combustion chamber remote end having at least one electrical connection and at least one return connection.
  • German patent application DE 31 05 685 A1 is a liquid-cooled fuel injection nozzle with a common connection nipple for the leak oil discharge and the coolant return known.
  • German patent application DE 10 2006 040 248 A1 discloses a fuel injector for a multi-cylinder internal combustion engine with a housing having two high-pressure ports.
  • DE 197 17 459 A1 shows a further fuel injection device.
  • the object of the invention is to provide a fuel injection device according to the preamble of claim 1, which is simple in construction and inexpensive to produce.
  • a preferred embodiment of the fuel injection device is characterized in that the return port and the electrical connection are partially encapsulated with plastic material.
  • the return port is preferably overmolded with the same plastic material as used to overmold electrical connections.
  • a further preferred embodiment of the fuel injection device is characterized in that the fuel injection device comprises a magnet group, which is, at least partially, encapsulated with plastic material together with the return port and the electrical connection.
  • the magnet group includes, for example, a magnetic actuator which cooperates in a known manner with a magnetic coil, which is associated with the electrical connection.
  • a further preferred embodiment of the fuel injection device is characterized in that radially outside an inner support point of the support plate at least one return channel emanates from a return space in the fuel injection device. At the inner support point of the guide pin described above may be supported.
  • the return passage serves to discharge, for example, leakage and / or a cooling medium in the form of fuel, which is acted upon by low pressure, from the interior of the fuel injection device.
  • the return passage may communicate with a fuel receptacle external to the fuel injector.
  • a further preferred embodiment of the fuel injection device is characterized in that radially outside an inner support point of the support plate, a plurality of return passages emanate from a return space in the fuel injection device, which open into a central return connection channel.
  • the return passage in the common connection body may for example have the shape of a two-legged Y-type, extending from the return space inside the fuel injector and opening into the central return connection passage.
  • a further preferred exemplary embodiment of the fuel injection device is characterized in that a return connection channel running transversely to a longitudinal direction of the fuel injection device originates from the return channel or the return connection channel.
  • the return is formed in the common connection body substantially L-shaped.
  • Another preferred embodiment of the fuel injection device is characterized in that two return passageways extending transversely to a longitudinal direction of the fuel injection device start from the return passage or the return connection passage.
  • the return is formed in the common connection body is substantially T-shaped.
  • a further preferred embodiment of the fuel injection device is characterized in that at the inner support point, a guide pin and / or a spring device are supported on the inside of the support plate / is.
  • the spring device may further comprise a plate spring, which acts on a magnetic actuator with a biasing force.
  • FIG. 1 four series-connected fuel injectors 1 to 4 are shown greatly simplified.
  • the fuel injectors 1 to 4 each include a combustion chamber near end 5, is injected from the high-pressure fuel into associated combustion chambers of an internal combustion engine.
  • the fuel injectors 1 to 4 which are also referred to as fuel injectors, furthermore each have a combustion chamber remote end 6, which is connected via a return port 8 to a return line.
  • the return ports of the fuel injectors 1 to 3 are each designed as T-pieces 11, 12, 13.
  • the return port of the fuel injection device 4 is designed as an L-piece 14.
  • the two tees 12 and 13 are connected via a connecting line 15 with each other.
  • the T-piece is connected via a further connecting line 17 with the L-piece 14.
  • the two tees 11 and 12 are connected to each other via a connecting line 18.
  • a connecting line 19 extends from the T-piece 11 to a return collecting space, which is indicated by an arrow 16.
  • fuel injector is preferably designed for a multi-cylinder internal combustion engine, preferably a self-igniting internal combustion engine, a motor vehicle.
  • the fuel injection device comprises in addition to the illustrated fuel injectors 1 to 4 at least one high-pressure pump, is conveyed by the fuel under high pressure.
  • Each cylinder of the internal combustion engine is associated with one of the fuel injectors 1 to 4, which are also referred to as injectors and through which the fuel can be injected into the combustion chamber of the associated cylinder.
  • the high-pressure fuel is supplied to the fuel injectors 1 to 4 via high-pressure fuel lines.
  • the control of the fuel injectors 1 to 4 is preferably carried out electrically via electrical connection lines.
  • the fuel injection device 1 comprises a housing body 20, which may be made in one or more parts.
  • a magnet group 22 is housed in a return pressure chamber 24.
  • the magnet group 22 comprises a magnetic actuator 25 with a magnetic coil 26 which cooperates with a magnetic armature 27.
  • the magnet armature 27 is guided away from the magnet coil 26 by a guide pin 28 and towards the magnet coil 26.
  • the guide pin 28 is supported on a support plate 30, which limits the return pressure chamber 24 in the axial direction. In the radial direction of the return pressure chamber 24 is bounded by the housing body 20.
  • the armature 27 is biased away from the solenoid 26 by a helical compression spring 31 through which the guide pin 28 extends.
  • the magnetic actuator 25 with the magnetic coil 26 is biased by a plate spring 32 away from the support plate 30 and is driven via an electrical connection 33.
  • FIG. 3 From the magnetic coil 26 of the magnetic group 22 go, as you can in FIG. 3 See, two electrical connection elements 35, 36 which extend through an electrical connector 34 into a connector body 60 which is formed of plastic material 62, with which the combustion chamber distal end 6 of the fuel injection device 1 is encapsulated.
  • the connecting element 35 extends at its end transversely to the longitudinal direction of the fuel injection device 1.
  • the return channels 41, 42 From the return pressure chamber 24 go two return channels 41, 42, which open into a common return connection channel 44 of a return port 40.
  • the return channels 41, 42 extend radially outwardly of a support point 45 for the guide pin 28 through the support plate 30 so that they together with the return connection channel 44 in longitudinal section represent a Ypsilon, the in FIG. 2 is upside down.
  • the return connection channel 44 opens at its end remote from the combustion chamber into the connection body 60, through which the two electrical connection elements 35 and 36 also extend. From the combustion chamber-remote end of the return connection channel 44, two transverse return connection channels 51, 52, in the example shown in the form of line sections, extend through the plastic material 62, which forms the connection body 60. To the return port channel 51, the connecting line 18 is connected.
  • This in FIG. 3 illustrated embodiment with the two return connection channels 51, 52 represents a T-piece. Alternatively, with the help of only one of the return connection channels 51, 52 analogous to an L-piece are shown.
  • the return port 40 is integrated directly into the magnet group injection molding.
  • a return fitting can be welded to the support plate and then encapsulated with plastic material.
  • the invention also includes an embodiment made entirely of plastic, wherein the connecting piece, for example in the form of a T-piece or L-piece, inserted into the support plate 30 and sealed by means of an O-ring and then encapsulated.
  • the return port can be integrated into a Umspritzungstechnikmaschinetician with which the combustion chamber remote end of the fuel injection device is molded.

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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)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Kraftstoffeinspritzvorrichtung zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine, mit einem brennraumfernen Ende, das mindestens einen elektrischen Anschluss und mindestens einen Rücklaufanschluss aufweist.The invention relates to a fuel injection device for injecting fuel into a combustion chamber of an internal combustion engine, with a combustion chamber remote end having at least one electrical connection and at least one return connection.

Aus der deutschen Offenlegungsschrift DE 31 05 685 A1 ist eine flüssigkeitsgekühlte Kraftstoffeinspritzdüse mit einem gemeinsamen Anschlussnippel für die Leckölabfuhr und die Kühlmittelrückführung bekannt. Aus der deutschen Offenlegungsschrift DE 10 2006 040 248 A1 ist eine Kraftstoffeinspritzeinrichtung für eine mehrzylindrige Brennkraftmaschine mit einem Gehäuse bekannt, das zwei Hochdruckanschlüsse aufweist. DE 197 17 459 A1 zeigt eine weitere Kraftstoffeinspritzeinrichtung.From the German patent application DE 31 05 685 A1 is a liquid-cooled fuel injection nozzle with a common connection nipple for the leak oil discharge and the coolant return known. From the German patent application DE 10 2006 040 248 A1 discloses a fuel injector for a multi-cylinder internal combustion engine with a housing having two high-pressure ports. DE 197 17 459 A1 shows a further fuel injection device.

Offenbarung der ErfindungDisclosure of the invention

Aufgabe der Erfindung ist es, eine Kraftstoffeinspritzvorrichtung gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, die einfach aufgebaut und kostengünstig herstellbar ist.The object of the invention is to provide a fuel injection device according to the preamble of claim 1, which is simple in construction and inexpensive to produce.

Die Aufgabe ist durch eine Kraftstoffeinspritzvorrichtung gemäß Anspruch 1 gelöst. Ein bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzvorrichtung ist dadurch gekennzeichnet, dass der Rücklaufanschluss und der elektrische Anschluss teilweise mit Kunststoffmaterial umspritzt sind. Der Rücklaufanschluss ist vorzugsweise mit dem gleichen Kunststoffmaterial umspritzt, wie es zum Umspritzen von elektrischen Anschlüssen verwendet wird.The object is achieved by a fuel injection device according to claim 1. A preferred embodiment of the fuel injection device is characterized in that the return port and the electrical connection are partially encapsulated with plastic material. The return port is preferably overmolded with the same plastic material as used to overmold electrical connections.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzvorrichtung ist dadurch gekennzeichnet, dass die Kraftstoffeinspritzvorrichtung eine Magnetgruppe umfasst, die, zumindest teilweise, zusammen mit dem Rücklaufanschluss und dem elektrischen Anschluss mit Kunststoffmaterial umspritzt ist. Die Magnetgruppe umfasst zum Beispiel einen Magnetaktor, der in bekannter Art und Weise mit einer Magnetspule zusammenwirkt, welcher der elektrische Anschluss zugeordnet ist.A further preferred embodiment of the fuel injection device is characterized in that the fuel injection device comprises a magnet group, which is, at least partially, encapsulated with plastic material together with the return port and the electrical connection. The magnet group includes, for example, a magnetic actuator which cooperates in a known manner with a magnetic coil, which is associated with the electrical connection.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzvorrichtung ist dadurch gekennzeichnet, dass radial außerhalb einer inneren Abstützstelle der Stützplatte mindestens ein Rücklaufkanal von einem Rücklaufraum in der Kraftstoffeinspritzvorrichtung ausgeht. An der inneren Abstützstelle kann der vorab beschriebene Führungsbolzen abgestützt sein. Der Rücklaufkanal dient dazu, zum Beispiel Leckage und/oder ein Kühlmedium in Form von Kraftstoff, der mit Niederdruck beaufschlagt ist, aus dem Inneren der Kraftstoffeinspritzvorrichtung abzuführen. Der Rücklaufkanal kann mit einem Kraftstoffaufnahmebehälter außerhalb der Kraftstoffeinspritzvorrichtung in Verbindung stehen.A further preferred embodiment of the fuel injection device is characterized in that radially outside an inner support point of the support plate at least one return channel emanates from a return space in the fuel injection device. At the inner support point of the guide pin described above may be supported. The return passage serves to discharge, for example, leakage and / or a cooling medium in the form of fuel, which is acted upon by low pressure, from the interior of the fuel injection device. The return passage may communicate with a fuel receptacle external to the fuel injector.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzvorrichtung ist dadurch gekennzeichnet, dass radial außerhalb einer inneren Abstützstelle der Stützplatte mehrere Rücklaufkanäle von einem Rücklaufraum in der Kraftstoffeinspritzvorrichtung ausgehen, die in einen zentralen Rücklaufverbindungskanal münden. Der Rücklauf kann in dem gemeinsamen Anschlusskörper, im Längsschnitt betrachtet, zum Beispiel die Gestalt eines Ypsilons mit zwei Schenkeln aufweisen, die sich von dem Rücklaufraum im Inneren der Kraftstoffeinspritzvorrichtung erstrecken und in den zentralen Rücklaufverbindungskanal münden.A further preferred embodiment of the fuel injection device is characterized in that radially outside an inner support point of the support plate, a plurality of return passages emanate from a return space in the fuel injection device, which open into a central return connection channel. The return passage in the common connection body, viewed in longitudinal section, may for example have the shape of a two-legged Y-type, extending from the return space inside the fuel injector and opening into the central return connection passage.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzvorrichtung ist dadurch gekennzeichnet, dass ein quer zu einer Längsrichtung der Kraftstoffeinspritzvorrichtung verlaufender Rücklaufanschlusskanal von dem Rücklaufkanal oder dem Rücklaufverbindungskanal ausgeht. Der Rücklauf ist in dem gemeinsamen Anschlusskörper im Wesentlichen L-förmig ausgebildet.A further preferred exemplary embodiment of the fuel injection device is characterized in that a return connection channel running transversely to a longitudinal direction of the fuel injection device originates from the return channel or the return connection channel. The return is formed in the common connection body substantially L-shaped.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzvorrichtung ist dadurch gekennzeichnet, dass zwei quer zu einer Längsrichtung der Kraftstoffeinspritzvorrichtung verlaufende Rücklaufanschlusskanäle von dem Rücklaufkanal oder dem Rücklaufverbindungskanal ausgehen. Der Rücklauf ist in dem gemeinsamen Anschlusskörper im Wesentlichen T-förmig ausgebildet.Another preferred embodiment of the fuel injection device is characterized in that two return passageways extending transversely to a longitudinal direction of the fuel injection device start from the return passage or the return connection passage. The return is formed in the common connection body is substantially T-shaped.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzvorrichtung ist dadurch gekennzeichnet, dass an der inneren Abstützstelle ein Führungsbolzen und/oder eine Federeinrichtung innen an der Stützplatte abgestützt sind/ist. Die Federeinrichtung kann des Weiteren eine Tellerfeder umfassen, die einen Magnetaktor mit einer Vorspannkraft beaufschlagt.A further preferred embodiment of the fuel injection device is characterized in that at the inner support point, a guide pin and / or a spring device are supported on the inside of the support plate / is. The spring device may further comprise a plate spring, which acts on a magnetic actuator with a biasing force.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel im Einzelnen beschrieben ist.Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, an embodiment is described in detail.

Kurze Beschreibung der ZeichnungShort description of the drawing

Es zeigen:

Figur 1
eine stark vereinfachte Darstellung eines Ausschnitts eines Kraftstoffeinspritzsystems mit vier in Reihe geschalteten Kraftstoffeinspritzvorrichtungen;
Figur 2
eine vergrößerte und detaillierte Darstellung des brennraumfernen Endes einer der Kraftstoffeinspritzvorrichtungen aus Figur 1 im Längsschnitt und
Figur 3
einen um 90 Grad verdrehten Längsschnitt des brennraumfernen Endes der Kraftstoffeinspritzvorrichtung aus Figur 2.
Show it:
FIG. 1
a highly simplified representation of a section of a fuel injection system with four fuel injection devices connected in series;
FIG. 2
an enlarged and detailed view of the combustion chamber distal end of one of the fuel injectors FIG. 1 in longitudinal section and
FIG. 3
a 90 degree twisted longitudinal section of the combustion chamber distal end of the fuel injection device from FIG. 2 ,

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 sind vier in Reihe geschaltete Kraftstoffeinspritzvorrichtungen 1 bis 4 stark vereinfacht dargestellt. Die Kraftstoffeinspritzvorrichtungen 1 bis 4 umfassen jeweils ein brennraumnahes Ende 5, aus dem mit Hochdruck beaufschlagter Kraftstoff in zugehörige Brennräume einer Brennkraftmaschine eingespritzt wird. Die Kraftstoffeinspritzvorrichtungen 1 bis 4, die auch als Kraftstoffinjektoren bezeichnet werden, weisen des Weiteren jeweils ein brennraumfernes Ende 6 auf, das über einen Rücklaufanschluss 8 an einen Rücklauf angeschlossen ist.In FIG. 1 four series-connected fuel injectors 1 to 4 are shown greatly simplified. The fuel injectors 1 to 4 each include a combustion chamber near end 5, is injected from the high-pressure fuel into associated combustion chambers of an internal combustion engine. The fuel injectors 1 to 4, which are also referred to as fuel injectors, furthermore each have a combustion chamber remote end 6, which is connected via a return port 8 to a return line.

Die Rücklaufanschlüsse der Kraftstoffeinspritzvorrichtungen 1 bis 3 sind jeweils als T-Stück 11, 12, 13 ausgeführt. Der Rücklaufanschluss der Kraftstoffeinspritzvorrichtung 4 ist als L-Stück 14 ausgeführt. Die beiden T-Stücke 12 und 13 sind über eine Verbindungsleitung 15 miteinander verbunden. Das T-Stück ist über eine weitere Verbindungsleitung 17 mit dem L-Stück 14 verbunden. Die beiden T-Stücke 11 und 12 sind über eine Verbindungsleitung 18 miteinander verbunden. Von dem T-Stück 11 erstreckt sich des Weiteren eine Verbindungsleitung 19 zu einem Rücklaufsammelraum, der durch einen Pfeil 16 angedeutet ist.The return ports of the fuel injectors 1 to 3 are each designed as T-pieces 11, 12, 13. The return port of the fuel injection device 4 is designed as an L-piece 14. The two tees 12 and 13 are connected via a connecting line 15 with each other. The T-piece is connected via a further connecting line 17 with the L-piece 14. The two tees 11 and 12 are connected to each other via a connecting line 18. Furthermore, a connecting line 19 extends from the T-piece 11 to a return collecting space, which is indicated by an arrow 16.

Die in Figur 1 nur teilweise dargestellte Kraftstoffeinspritzeinrichtung ist vorzugsweise für eine mehrzylindrige Brennkraftmaschine, vorzugsweise eine selbstzündende Brennkraftmaschine, eines Kraftfahrzeugs ausgelegt. Die Kraftstoffeinspritzeinrichtung umfasst neben den dargestellten Kraftstoffeinspritzvorrichtungen 1 bis 4 wenigstens eine Hochdruckpumpe, durch die Kraftstoff unter Hochdruck gefördert wird.In the FIG. 1 only partially shown fuel injector is preferably designed for a multi-cylinder internal combustion engine, preferably a self-igniting internal combustion engine, a motor vehicle. The fuel injection device comprises in addition to the illustrated fuel injectors 1 to 4 at least one high-pressure pump, is conveyed by the fuel under high pressure.

Jedem Zylinder der Brennkraftmaschine ist eine der Kraftstoffeinspritzvorrichtungen 1 bis 4 zugeordnet, die auch als Injektoren bezeichnet werden und durch die der Kraftstoff in den Brennraum des zugehörigen Zylinders eingespritzt werden kann. Der mit Hochdruck beaufschlagte Kraftstoff wird den Kraftstoffeinspritzvorrichtungen 1 bis 4 über Kraftstoffhochdruckleitungen zugeführt. Die Ansteuerung der Kraftstoffeinspritzvorrichtungen 1 bis 4 erfolgt vorzugsweise elektrisch über elektrische Anschlussleitungen.Each cylinder of the internal combustion engine is associated with one of the fuel injectors 1 to 4, which are also referred to as injectors and through which the fuel can be injected into the combustion chamber of the associated cylinder. The high-pressure fuel is supplied to the fuel injectors 1 to 4 via high-pressure fuel lines. The control of the fuel injectors 1 to 4 is preferably carried out electrically via electrical connection lines.

In den Figuren 2 und 3 ist das brennraumferne Ende 6 der Kraftstoffeinspritzvorrichtung 1 vergrößert in zwei verschiedenen Längsschnittansichten dargestellt. Die Kraftstoffeinspritzvorrichtung 1 umfasst einen Gehäusekörper 20, der ein- oder mehrteilig ausgeführt sein kann. In dem brennraumfernen Ende des Gehäusekörpers 20 ist eine Magnetgruppe 22 in einem Rücklaufdruckraum 24 untergebracht.In the Figures 2 and 3 the combustion chamber remote end 6 of the fuel injection device 1 is shown enlarged in two different longitudinal sectional views. The fuel injection device 1 comprises a housing body 20, which may be made in one or more parts. In the combustion chamber remote end of the housing body 20, a magnet group 22 is housed in a return pressure chamber 24.

Die Magnetgruppe 22 umfasst einen Magnetaktor 25 mit einer Magnetspule 26, die mit einem Magnetanker 27 zusammenwirkt. Der Magnetanker 27 ist durch einen Führungsbolzen 28 von der Magnetspule 26 weg und auf die Magnetspule 26 zu bewegbar geführt. Der Führungsbolzen 28 ist an einer Stützplatte 30 abgestützt, die den Rücklaufdruckraum 24 in axialer Richtung begrenzt. In radialer Richtung wird der Rücklaufdruckraum 24 von dem Gehäusekörper 20 begrenzt.The magnet group 22 comprises a magnetic actuator 25 with a magnetic coil 26 which cooperates with a magnetic armature 27. The magnet armature 27 is guided away from the magnet coil 26 by a guide pin 28 and towards the magnet coil 26. The guide pin 28 is supported on a support plate 30, which limits the return pressure chamber 24 in the axial direction. In the radial direction of the return pressure chamber 24 is bounded by the housing body 20.

Der Magnetanker 27 ist durch eine Schraubendruckfeder 31, durch die sich der Führungsbolzen 28 hindurch erstreckt, von der Magnetspule 26 weg vorgespannt. Der Magnetaktor 25 mit der Magnetspule 26 ist durch eine Tellerfeder 32 von der Stützplatte 30 weg vorgespannt und wird über einen elektrischen Anschluss 33 angesteuert.The armature 27 is biased away from the solenoid 26 by a helical compression spring 31 through which the guide pin 28 extends. The magnetic actuator 25 with the magnetic coil 26 is biased by a plate spring 32 away from the support plate 30 and is driven via an electrical connection 33.

Von der Magnetspule 26 der Magnetgruppe 22 gehen, wie man in Figur 3 sieht, zwei elektrische Anschlusselemente 35, 36 aus, die sich durch ein elektrisches Anschlussstück 34 hindurch in einen Anschlusskörper 60 erstrecken, der aus Kunststoffmaterial 62 gebildet ist, mit dem das brennraumferne Ende 6 der Kraftstoffeinspritzvorrichtung 1 umspritzt ist. In Figur 2 sieht man, dass sich das Anschlusselement 35 an seinem Ende quer zur Längsrichtung der Kraftstoffeinspritzvorrichtung 1 erstreckt.From the magnetic coil 26 of the magnetic group 22 go, as you can in FIG. 3 See, two electrical connection elements 35, 36 which extend through an electrical connector 34 into a connector body 60 which is formed of plastic material 62, with which the combustion chamber distal end 6 of the fuel injection device 1 is encapsulated. In FIG. 2 it can be seen that the connecting element 35 extends at its end transversely to the longitudinal direction of the fuel injection device 1.

Von dem Rücklaufdruckraum 24 gehen zwei Rücklaufkanäle 41, 42 aus, die in einen gemeinsamen Rücklaufverbindungskanal 44 eines Rücklaufanschlusses 40 münden. Die Rücklaufkanäle 41, 42 erstrecken sich radial außerhalb einer Abstützstelle 45 für den Führungsbolzen 28 so durch die Stützplatte 30 hindurch, dass sie zusammen mit dem Rücklaufverbindungskanal 44 im Längsschnitt ein Ypsilon darstellen, das in Figur 2 auf dem Kopf steht.From the return pressure chamber 24 go two return channels 41, 42, which open into a common return connection channel 44 of a return port 40. The return channels 41, 42 extend radially outwardly of a support point 45 for the guide pin 28 through the support plate 30 so that they together with the return connection channel 44 in longitudinal section represent a Ypsilon, the in FIG. 2 is upside down.

Der Rücklaufverbindungskanal 44 mündet an seinem brennraumfernen Ende in den Anschlusskörper 60, durch den sich auch die beiden elektrischen Anschlusselemente 35 und 36 hindurch erstrecken. Von dem brennraumfernen Ende des Rücklaufverbindungskanals 44 erstrecken sich zwei quer verlaufende Rücklaufanschlusskanäle 51, 52, im dargestellten Beispiel in Form von Leitungsstücken, durch das Kunststoffmaterial 62 hindurch, das den Anschlusskörper 60 bildet. An den Rücklaufanschlusskanal 51 ist die Verbindungsleitung 18 angeschlossen. Das in Figur 3 dargestellte Ausführungsbeispiel mit den beiden Rücklaufanschlusskanälen 51, 52 stellt ein T-Stück dar. Alternativ kann mit Hilfe von nur einem der Rücklaufanschlusskanäle 51, 52 analog ein L-Stück dargestellt werden.The return connection channel 44 opens at its end remote from the combustion chamber into the connection body 60, through which the two electrical connection elements 35 and 36 also extend. From the combustion chamber-remote end of the return connection channel 44, two transverse return connection channels 51, 52, in the example shown in the form of line sections, extend through the plastic material 62, which forms the connection body 60. To the return port channel 51, the connecting line 18 is connected. This in FIG. 3 illustrated embodiment with the two return connection channels 51, 52 represents a T-piece. Alternatively, with the help of only one of the return connection channels 51, 52 analogous to an L-piece are shown.

Gemäß einem wesentlichen Aspekt der Erfindung wird der Rücklaufanschluss 40 direkt in die Magnetgruppenumspritzung integriert. Zu diesem Zweck kann ein Rücklaufanschlussstück an die Stützplatte geschweißt und anschließend mit Kunststoffmaterial umspritzt werden. Die Erfindung umfasst auch eine Ausführung ganz aus Kunststoff, wobei das Anschlussstück, zum Beispiel in Form eines T-Stücks oder L-Stücks, in die Stützplatte 30 gesteckt und mittels eines O-Rings abgedichtet und anschließend umspritzt wird. Des Weiteren kann der Rücklaufanschluss in ein Umspritzungswerkzeug integriert werden, mit welchem das brennraumferne Ende der Kraftstoffeinspritzvorrichtung umspritzt wird.According to an essential aspect of the invention, the return port 40 is integrated directly into the magnet group injection molding. For this purpose, a return fitting can be welded to the support plate and then encapsulated with plastic material. The invention also includes an embodiment made entirely of plastic, wherein the connecting piece, for example in the form of a T-piece or L-piece, inserted into the support plate 30 and sealed by means of an O-ring and then encapsulated. Furthermore, the return port can be integrated into a Umspritzungswerkzeug with which the combustion chamber remote end of the fuel injection device is molded.

Claims (8)

  1. Fuel injection device for injecting fuel into a combustion chamber of an internal combustion engine, having an end (6) remote from the combustion chamber, which end (6) has at least one electrical connection (33) and at least one return connection (40), wherein the return connection (40) and the electrical connection (33) are integrated into a common connection head and the fuel injection device comprises a housing body (20), wherein the connection body (60) is formed from plastic material (62) with which that end (6) of the fuel injection device (1) which is remote from the combustion chamber is extrusion-coated, and the return connection (40) runs through a support plate (30) which constitutes a connection on that end (6) of the fuel injection device which is remote from the combustion chamber, wherein the support plate (30) delimits a return chamber (24), which is formed in the housing body (20), in an axial direction, characterized in that
    the support plate (30) delimits the return chamber (24) in an axial direction and the housing body (20) in a radial direction, and
    the magnet actuator is preloaded away from the support plate (30) by a plate spring (32), wherein the plate spring (32) is arranged in the return chamber (24).
  2. Fuel injection device according to Claim 1, characterized in that the return connection (40) and the electrical connection (33) are partially extrusion-coated with plastic material (62).
  3. Fuel injection device according to one of the preceding claims, characterized in that the fuel injection device (1) comprises a magnet assembly (22) which is at least partially extrusion-coated with plastic material (62) together with the return connection (40) and the electrical connection (33).
  4. Fuel injection device according to Claim 1, characterized in that, radially outside an inner support point (45) of the support plate (30), at least one return duct (41, 42) extends from the return chamber (24) in the fuel injection device (1).
  5. Fuel injection device according to Claim 1, characterized in that, radially outside an inner support point (45) of the support plate (30), a plurality of return ducts (41, 42) extend from the return chamber (24) in the fuel injection device (1), which return ducts open into a central return joining duct (44).
  6. Fuel injection device according to Claim 4 or 5, characterized in that a return connection duct (51, 52) which runs perpendicular to a longitudinal direction of the fuel injection device (1) extends from the return duct (41, 42) or from the return joining duct (44).
  7. Fuel injection device according to Claim 4 or 5, characterized in that two return connection ducts (51, 52) which run perpendicular to a longitudinal direction of the fuel injection device (1) extend from the return duct (41, 42) or from the return joining duct (44).
  8. Fuel injection device according to one of Claims 4, 5, 6 or 7, characterized in that, at the inner support point (45), a guide pin (28) and/or a spring device are/is supported at the inside on the support plate (30).
EP10708536.7A 2009-04-02 2010-03-12 Fuel injection device Active EP2414663B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009002128A DE102009002128A1 (en) 2009-04-02 2009-04-02 Fuel injector
PCT/EP2010/053168 WO2010112317A1 (en) 2009-04-02 2010-03-12 Fuel injection device

Publications (2)

Publication Number Publication Date
EP2414663A1 EP2414663A1 (en) 2012-02-08
EP2414663B1 true EP2414663B1 (en) 2018-05-16

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EP10708536.7A Active EP2414663B1 (en) 2009-04-02 2010-03-12 Fuel injection device

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US (1) US9175652B2 (en)
EP (1) EP2414663B1 (en)
CN (1) CN102369348B (en)
DE (1) DE102009002128A1 (en)
WO (1) WO2010112317A1 (en)

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Also Published As

Publication number Publication date
WO2010112317A1 (en) 2010-10-07
US9175652B2 (en) 2015-11-03
DE102009002128A1 (en) 2010-10-14
EP2414663A1 (en) 2012-02-08
US20120090577A1 (en) 2012-04-19
CN102369348B (en) 2014-12-10
CN102369348A (en) 2012-03-07

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