EP1797314B1 - Fuel injector on an internal combustion engine - Google Patents

Fuel injector on an internal combustion engine Download PDF

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Publication number
EP1797314B1
EP1797314B1 EP05766805A EP05766805A EP1797314B1 EP 1797314 B1 EP1797314 B1 EP 1797314B1 EP 05766805 A EP05766805 A EP 05766805A EP 05766805 A EP05766805 A EP 05766805A EP 1797314 B1 EP1797314 B1 EP 1797314B1
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EP
European Patent Office
Prior art keywords
bore
filter
fuel
fuel line
injector
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.)
Not-in-force
Application number
EP05766805A
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German (de)
French (fr)
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EP1797314A1 (en
Inventor
Andreas Wengert
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1797314A1 publication Critical patent/EP1797314A1/en
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Publication of EP1797314B1 publication Critical patent/EP1797314B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet

Definitions

  • the invention is based on an injector for fuel injection in an internal combustion engine according to the preamble of claim 1.
  • Such an injector is through the DE 100 57 683 A known.
  • This injector has an injector body, on which a fuel line is closed, is supplied from the high-pressure fuel from a memory to the injector.
  • a bore is provided in the injector body into which a fuel filter is inserted, through which the fuel supplied through the fuel line flows prior to injection.
  • a sealing seat is formed in the filter bore against which the end region of the fuel line is pressed when it is fastened to the injector body.
  • the sealing seat and the end region of the fuel line are arranged with their longitudinal axis at least approximately coaxial with the filter bore.
  • the position of the filter bore in the injector body must be selected depending on the space available in the injector body, in which case the position of the end region of the fuel line is fixed and can not be optimally selected depending on the space available in the vicinity of the injector.
  • an unfavorable installation position of the end region of the fuel line can result, in which case a large structural height can result, in particular in the longitudinal direction of the injector, whereby the installation of an internal combustion engine equipped with the injector in a motor vehicle can be made more difficult.
  • the aim is to keep the overall height of the internal combustion engine low in order to achieve a sufficient deformation path of the engine hood of the motor vehicle over the internal combustion engine, as it is necessary to meet future requirements for pedestrian protection.
  • the injector according to the invention with the features of claim 1 has the advantage that the position of the connection of the fuel line can be selected independently of the position of the filter bore in the injector body.
  • the fuel filter can be used in a simple manner in the filter hole, as it opens on the outside of the injector and the inclined to the longitudinal axis of the filter bore arranged sealing seat can be edited by the further bore in a simple manner.
  • the sealing seat and the end region of the fuel line can be arranged arbitrarily inclined to the longitudinal axis of the filter bore, so that they can be optimally adapted to the available space.
  • FIG. 1 a fuel injection device for an internal combustion engine in a schematic representation
  • FIG. 2 in enlarged Depicting a in FIG. 1 labeled II section of an injector of the fuel injection device according to a first embodiment
  • FIG. 3 the detail II of the injector according to a second embodiment
  • FIG. 4 the section II of the injector with an opposite FIG. 3 modified version.
  • FIG. 1 a fuel injection device for an internal combustion engine of a motor vehicle is shown.
  • the internal combustion engine is preferably a self-igniting internal combustion engine and has a plurality of cylinders.
  • the fuel injection device has a feed pump 10, is conveyed by the fuel from a reservoir 12 to a high-pressure pump 14.
  • fuel is conveyed under high pressure in a high-pressure accumulator 16.
  • injectors 20 are connected via high pressure lines.
  • Each injector 20 has a control valve 22, by means of which a likewise a part of the injector 20 forming fuel injection valve 24 can be opened to a fuel injection or can be closed to complete a fuel injection.
  • the control valves 22 of the injectors 20 are connected to an electronic control device 26 and are driven by them depending on operating parameters of the internal combustion engine.
  • the injector 20 has a multipart injector body 28 in which the fuel injection valve 24 is arranged at its end region facing the combustion chamber of the cylinder.
  • the fuel injection valve 24 has at least one injection valve member 30, which in a Bore 32 is slidably guided.
  • the injection valve member 30 at least one, preferably a plurality of injection openings 34 distributed over the circumference of the injector 20 is controlled at the end of the injector body 28 projecting into the combustion chamber.
  • the injection valve member 30 has, at its end region facing the combustion chamber, an approximately conical sealing surface 36, for example, which cooperates with an approximately cone-shaped valve seat 38 formed in the injector body 28 in the end region facing the combustion chamber, from which or after which the injection openings 34 are discharged.
  • annular space 40 is present between the injection valve member 30 and the bore 32 toward the valve seat 38, which merges in its end region remote from the valve seat 38 by a radial widening of the bore 32 into a pressure chamber 42 surrounding the injection valve member 30.
  • the injection valve member 30 has at the level of the pressure chamber 42 by a cross-sectional reduction to its sealing surface 36 toward a pressure shoulder 44.
  • a prestressed closing spring 46 At the end remote from the combustion chamber of the injection valve member 30 engages a prestressed closing spring 46, through which the injection valve member 30 is pressed with its sealing surface 36 toward the valve seat 38.
  • a control chamber 48 is formed in the injector body 28, which is delimited by the injection valve member 30 or a control piston 50 connected thereto, a force being generated in the closing direction on the injection valve member 30 by the pressure prevailing in the control chamber 48.
  • the high-pressure line 18 is connected to the injector body 28 and within the injector 28 leads an inlet bore 52 to the pressure chamber 42.
  • the control chamber 48 is also connected to the inlet bore 52 and also has a controlled by the control valve 22 connection 54 with a discharge area, the For example, a return to the reservoir 12 is.
  • connection 54 of the control chamber 48 with the discharge area so prevails in the control chamber 48 high pressure as in the pressure chamber 42, so that the injection valve member 30 remains in its closed position and no fuel injection.
  • the control valve 22 is opened so that it is the connection 54 of the control chamber 48 is opened with the discharge area, the control chamber 48 is relieved and the injection valve member 30 opens due to acting in the pressure chamber 42 on the pressure shoulder 44 high pressure, so that fuel is injected .
  • the control valve 22 may include an electromagnetic actuator or a piezoelectric actuator.
  • FIG. 2 the injector 20 is shown enlarged in sections according to a first embodiment, in particular, the connection of the fuel line 18 can be seen.
  • a bore 60 is provided, which opens on the outside of the injector body 28.
  • the bore 60 may extend with its longitudinal axis 61, for example approximately parallel to the longitudinal axis of the injection valve member 30 or slightly inclined to the longitudinal axis of the injection valve member 30, as shown in FIG FIG. 2 is shown.
  • a rod-shaped fuel filter 64 is used, so that the bore 60 is referred to below as a filter bore.
  • the filter bore 60 is connected to the pressure bore 42 and the control chamber 48 leading inlet bore 52.
  • a sealing seat 66 is provided, which is formed at a cross-sectional reduction of the filter bore 60, wherein the filter bore 60 has an inner bore portion 62 of small diameter, in which the fuel filter 64 is disposed, and a outer bore portion 63 of larger diameter, which opens at the outside of the injector body 28.
  • the two bore sections 62 and 63 may also have the same diameter.
  • the sealing seat 66 is formed, for example, at least approximately frusto-conical and its longitudinal axis 67 extends inclined to the longitudinal axis 61 of the filter bore 60th
  • a further bore 68 opening out on the outside thereof, which extends at least approximately coaxially with the sealing seat 66 and into which the end region of the fuel line 18 dips.
  • the bore 68 is provided with an internal thread 69.
  • a thickening 70 is provided, on the outer shell of a sealing seat 66 to the abutting sealing surface 72 is arranged, which may be at least approximately frusto-conical corresponding to the sealing seat 66 or, for example, at least approximately spherical.
  • an annular shoulder 74 is formed on the side facing away from the sealing surface 72 of the thickening 70 of the fuel line 18.
  • a hollow screw 76 is arranged, whose inner diameter is smaller than the outer diameter of the thickening 70 of the fuel line 18.
  • the hollow screw 76 is screwed with its external thread 77 in the internal thread 69 of the bore 68 of the injector body 28.
  • the hollow screw 76 comes with its end face in the axial direction of the annular shoulder 74 of the thickening 70 of the fuel line 18 to the system, whereby the thickening 70 is pressed with its sealing surface 72 against the sealing seat 66.
  • the hollow screw 76 is provided at its protruding from the bore 68 end, for example with a hexagonal profile 78 or a splined profile on which a tool can be attached to secure the hollow screw 76.
  • the outer bore portion 63 of the filter bore 60 is separated from the inner bore portion 62, wherein only the inner bore portion 62, in which the fuel filter 64 is disposed, is subjected to high pressure, the seal by the against the sealing seat 66 pressed fuel line 18 takes place.
  • the position of the further bore 68 and the sealing seat 66 can be selected independently of the position of the filter bore 60 depending on the space available.
  • the injector 20 is shown in sections according to a second embodiment, in which the basic structure is the same as in the first embodiment.
  • the further bore 68 into which the end region of the fuel line 18 dips, is formed in a protruding from the injector body 28 stub 80 which is provided with an external thread 81.
  • the filter bore 60 penetrates the nozzle 80 of the injector body 28.
  • the thickening 70 is arranged, which has the sealing face 72 facing the sealing seat 66 and the annular shoulder 74 facing away from the latter.
  • a sleeve 82 is arranged, whose inner diameter is smaller than the outer diameter of the thickening 70, so that the sleeve 82 comes with its front side in the axial direction of the annular shoulder 74 of the thickening 70 for conditioning.
  • the sleeve 82 dips into the bore 68 together with the end portion of the fuel line 18.
  • a sleeve 82 surrounding the union nut 84 is arranged, which has at one end a smaller inner diameter than the outer diameter of the sleeve 82, so that the union nut 84 on the sleeve 82 in the axial direction Plant comes.
  • the union nut 84 is screwed with its internal thread 85 on the external thread 81 of the nozzle 80 on the injector body 28 and has on its outer shell, for example, a hexagonal profile 86 to which a tool can be attached. Also in the second embodiment, by the end portion of the fuel passage 18 immersed in the bore 68, the outer bore portion 63 of the filter bore 60 is separated from the inner bore portion 62, with only the inner bore portion 62 in which the fuel filter 64 is pressurized, and its Seal by the pressed against the sealing seat 66 fuel line 18 takes place.
  • the injector 20 is fragmentary according to one opposite FIG. 3 shown slightly modified embodiment, wherein the thickening 70 at the end region of the fuel line 18 has a substantially greater extent in the direction of the longitudinal axis of the fuel line 18.
  • the thickening 70 extends to the end of the nozzle 80, so that the coupling nut 84 can act directly on the annular shoulder 74 of the thickening 70 and the sleeve 82 of the embodiment according to FIG. 3 can be omitted.
  • a relief fuel line 90 can be connected to the injector body 28, at least indirectly discharging fuel discharged from the control chamber 48 when the control valve 22 is open.
  • 28 electrical lines 92 are connected to the injector body for contacting the electrical actuator of the control valve 22nd

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

Abstract

An injector having an injector body to which a fuel line is connected for delivering fuel at high pressure. A filter bore is formed in the body and a fuel filter is disposed, through which filter the delivered fuel flows. A sealing seat is formed in the filter bore against which seat the end of the fuel line is pressed upon fastening of the fuel line to the injector body. The filter bore discharges at the outside of the injector body. The sealing seat is disposed with its longitudinal axis inclined to the longitudinal axis of the filter bore, and in the injector body, a bore extending at least approximately coaxially to the sealing seat is provided, into which the end region of the fuel line plunges. By the end region, plunging into the bore, of the fuel line, an outer end region of the filter bore, discharging at the outside of the injector body, is separated from an inner end region, subjected to high pressure, of the filter bore, and the fuel filter is disposed in the inner end region of the filter bore.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Injektor zur Kraftstoffeinspritzung an einer Brennkraftmaschine nach der Gattung des Anspruchs 1.The invention is based on an injector for fuel injection in an internal combustion engine according to the preamble of claim 1.

Ein solcher Injektor ist durch die DE 100 57 683 A bekannt. Dieser Injektor weist einen Injektorkörper auf, an dem eine Kraftstoffleitung abgeschlossen ist, durch die unter Hochdruck stehender Kraftstoff aus einem Speicher dem Injektor zugeführt wird. Im Injektorkörper ist eine Bohrung vorgesehen, in die ein Kraftstofffilter eingesetzt ist, durch den der durch die Kraftstoffleitung zugeführte Kraftstoff vor der Einspritzung strömt. In der Filterbohrung ist ein Dichtsitz gebildet, gegen den der Endbereich der Kraftstoffleitung bei deren Befestigung am Injektorkörper gepresst wird. Der Dichtsitz und der Endbereich der Kraftstoffleitung sind dabei mit ihrer Längsachse zumindest annähernd koaxial zu der Filterbohrung angeordnet. Die Lage der Filterbohrung im Injektorkörper muss abhängig von den Platzverhältnissen im Injektorkörper gewählt werden, wobei dann auch die Lage des Endbereichs der Kraftstoffleitung festgelegt ist und nicht abhängig von den Platzverhältnissen in der Umgebung des Injektors optimal gewählt werden kann. Hierdurch kann sich unter Umständen eine ungünstige Einbaulage des Endbereichs der Kraftstoffleitung ergeben, wobei sich insbesondere in Längsrichtung des Injektors eine große Bauhöhe ergeben kann, wodurch der Einbau einer mit dem Injektor ausgerüsteten Brennkraftmaschine in einem Kraftfahrzeug erschwert sein kann. Insbesondere wird angestrebt die Bauhöhe der Brennkraftmaschine gering zu halten, um einen ausreichenden Verformungsweg der Motorhaube des Kraftfahrzeugs über der Brennkraftmaschine zu schaffen, wie er zur Erfüllung zukünftiger Vorschriften zum Fußgängerschutz erforderlich ist.Such an injector is through the DE 100 57 683 A known. This injector has an injector body, on which a fuel line is closed, is supplied from the high-pressure fuel from a memory to the injector. A bore is provided in the injector body into which a fuel filter is inserted, through which the fuel supplied through the fuel line flows prior to injection. A sealing seat is formed in the filter bore against which the end region of the fuel line is pressed when it is fastened to the injector body. The sealing seat and the end region of the fuel line are arranged with their longitudinal axis at least approximately coaxial with the filter bore. The position of the filter bore in the injector body must be selected depending on the space available in the injector body, in which case the position of the end region of the fuel line is fixed and can not be optimally selected depending on the space available in the vicinity of the injector. As a result, under certain circumstances, an unfavorable installation position of the end region of the fuel line can result, in which case a large structural height can result, in particular in the longitudinal direction of the injector, whereby the installation of an internal combustion engine equipped with the injector in a motor vehicle can be made more difficult. In particular, the aim is to keep the overall height of the internal combustion engine low in order to achieve a sufficient deformation path of the engine hood of the motor vehicle over the internal combustion engine, as it is necessary to meet future requirements for pedestrian protection.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Injektor mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, dass die Lage des Anschlusses der Kraftstoffleitung unabhängig von der Lage der Filterbohrung im Injektorkörper gewählt werden kann. Der Kraftstofffilter kann dabei auf einfache Weise in die Filterbohrung eingesetzt werden, da diese an der Außenseite des Injektorkörpers mündet und der geneigt zur Längsachse der Filterbohrung angeordnete Dichtsitz kann durch die weitere Bohrung auf einfache Weise bearbeitet werden. Der Dichtsitz und der Endbereich der Kraftstoffleitung können dabei beliebig geneigt zur Längsachse der Filterbohrung angeordnet werden, so dass diese optimal an die zur Verfügung stehenden Platzverhältnisse angepasst werden können.The injector according to the invention with the features of claim 1 has the advantage that the position of the connection of the fuel line can be selected independently of the position of the filter bore in the injector body. The fuel filter can be used in a simple manner in the filter hole, as it opens on the outside of the injector and the inclined to the longitudinal axis of the filter bore arranged sealing seat can be edited by the further bore in a simple manner. The sealing seat and the end region of the fuel line can be arranged arbitrarily inclined to the longitudinal axis of the filter bore, so that they can be optimally adapted to the available space.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen des erfindungsgemäßen Injektors angegeben. Die Ausbildung gemäß Anspruch 2 ermöglicht eine besonders einfache Befestigung der Kraftstoffleitung am Injektorkörper, zu der als zusätzliches Bauteil nur die Hohlschraube erforderlich ist.In the dependent claims advantageous refinements and developments of the injector according to the invention are given. The embodiment according to claim 2 allows a particularly simple attachment of the fuel line to the injector, to which only the hollow screw is required as an additional component.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine in schematischer Darstellung, Figur 2 in vergrößerter Darstellung einen in Figur 1 mit II bezeichneten Ausschnitt eines Injektors der Kraftstoffeinspritzeinrichtung gemäß einem ersten Ausführungsbeispiel, Figur 3 den Ausschnitt II des Injektors gemäß einem zweiten Ausführungsbeispiel und Figur 4 den Ausschnitt II des Injektors mit einer gegenüber Figur 3 modifizierten Ausführung.Two embodiments of the invention are illustrated in the drawing and explained in more detail in the following description. Show it FIG. 1 a fuel injection device for an internal combustion engine in a schematic representation, FIG. 2 in enlarged Depicting a in FIG. 1 labeled II section of an injector of the fuel injection device according to a first embodiment, FIG. 3 the detail II of the injector according to a second embodiment and FIG. 4 the section II of the injector with an opposite FIG. 3 modified version.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Figur 1 ist eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine eines Kraftfahrzeugs dargestellt. Die Brennkraftmaschine ist vorzugsweise eine selbstzündende Brennkraftmaschine und weist mehrere Zylinder auf. Die Kraftstoffeinspritzeinrichtung weist eine Förderpumpe 10 auf, durch die Kraftstoff aus einem Vorratsbehälter 12 zu einer Hochdruckpumpe 14 gefördert wird. Durch die Hochdruckpumpe 14 wird Kraftstoff unter Hochdruck in einen Hochdruckspeicher 16 gefördert. Mit dem Hochdruckspeicher 16 sind über Hochdruckleitungen 18 an den Zylindern der Brennkraftmaschine angeordnete Injektoren 20 verbunden. Jeder Injektor 20 weist ein Steuerventil 22 auf, mittels dem ein ebenfalls einen Teil des Injektors 20 bildendes Kraftstoffeinspritzventil 24 zu einer Kraftstoffeinspritzung geöffnet werden kann bzw. zur Beendigung einer Kraftstoffeinspritzung geschlossen werden kann. Die Steuerventile 22 der Injektoren 20 sind mit einer elektronischen Steuereinrichtung 26 verbunden und werden durch diese abhängig von Betriebsparametern der Brennkraftmaschine angesteuert.In FIG. 1 a fuel injection device for an internal combustion engine of a motor vehicle is shown. The internal combustion engine is preferably a self-igniting internal combustion engine and has a plurality of cylinders. The fuel injection device has a feed pump 10, is conveyed by the fuel from a reservoir 12 to a high-pressure pump 14. By the high pressure pump 14 fuel is conveyed under high pressure in a high-pressure accumulator 16. With the high pressure accumulator 16 18 arranged on the cylinders of the internal combustion engine injectors 20 are connected via high pressure lines. Each injector 20 has a control valve 22, by means of which a likewise a part of the injector 20 forming fuel injection valve 24 can be opened to a fuel injection or can be closed to complete a fuel injection. The control valves 22 of the injectors 20 are connected to an electronic control device 26 and are driven by them depending on operating parameters of the internal combustion engine.

Der Injektor 20 weist einen mehrteiligen Injektorkörper 28 auf, in dem an dessen dem Brennraum des Zylinders zugewandtem Endbereich das Kraftstoffeinspritzventil 24 angeordnet ist. Das Kraftstoffeinspritzventil 24 weist wenigstens ein Einspritzventilglied 30 auf, das in einer Bohrung 32 verschiebbar geführt ist. Durch das Einspritzventilglied 30 wird wenigstens eine, vorzugsweise mehrere über den Umfang des Injektors 20 verteilt angeordnete Einspritzöffnungen 34 am in den Brennraum ragenden Ende des Injektorkörpers 28 gesteuert. Das Einspritzventilglied 30 weist an seinem dem Brennraum zugewandten Endbereich eine beispielsweise etwa kegelförmige Dichtfläche 36 auf, die mit einem im Injektorkörper 28 in dessen dem Brennraum zugewandtem Endbereich ausgebildeten etwa kegelförmigen Ventilsitz 38 zusammenwirkt, von dem oder nach dem die Einspritzöffnungen 34 abführen. Im Injektorkörper 28 ist zwischen dem Einspritzventilglied 30 und der Bohrung 32 zum Ventilsitz 38 hin ein Ringraum 40 vorhanden, der in seinem dem Ventilsitz 38 abgewandten Endbereich durch eine radiale Erweiterung der Bohrung 32 in einen das Einspritzventilglied 30 umgebenden Druckraum 42 übergeht. Das Einspritzventilglied 30 weist auf Höhe des Druckraums 42 durch eine Querschnittsverringerung zu seiner Dichtfläche 36 hin eine Druckschulter 44 auf. Am dem Brennraum abgewandten Ende des Einspritzventilglieds 30 greift eine vorgespannte Schließfeder 46 an, durch die das-Einspritzventilglied 30 mit seiner Dichtfläche 36 zum Ventilsitz 38 hin gedrückt wird.The injector 20 has a multipart injector body 28 in which the fuel injection valve 24 is arranged at its end region facing the combustion chamber of the cylinder. The fuel injection valve 24 has at least one injection valve member 30, which in a Bore 32 is slidably guided. By the injection valve member 30 at least one, preferably a plurality of injection openings 34 distributed over the circumference of the injector 20 is controlled at the end of the injector body 28 projecting into the combustion chamber. The injection valve member 30 has, at its end region facing the combustion chamber, an approximately conical sealing surface 36, for example, which cooperates with an approximately cone-shaped valve seat 38 formed in the injector body 28 in the end region facing the combustion chamber, from which or after which the injection openings 34 are discharged. In the injector body 28, an annular space 40 is present between the injection valve member 30 and the bore 32 toward the valve seat 38, which merges in its end region remote from the valve seat 38 by a radial widening of the bore 32 into a pressure chamber 42 surrounding the injection valve member 30. The injection valve member 30 has at the level of the pressure chamber 42 by a cross-sectional reduction to its sealing surface 36 toward a pressure shoulder 44. At the end remote from the combustion chamber of the injection valve member 30 engages a prestressed closing spring 46, through which the injection valve member 30 is pressed with its sealing surface 36 toward the valve seat 38.

Im Injektorkörper 28 ist außerdem ein Steuerraum 48 gebildet, der durch das Einspritzventilglied 30 oder einen mit diesem verbundenen Steuerkolben 50 begrenzt wird, wobei durch den im Steuerraum 48 herrschenden Druck eine Kraft in Schließrichtung auf das Einspritzventilglied 30 erzeugt wird. Die Hochdruckleitung 18 ist am Injektorkörper 28 angeschlossen und innerhalb des Injektorkörpers 28 führt eine Zulaufbohrung 52 zum Druckraum 42. Der Steuerraum 48 ist ebenfalls mit der Zulaufbohrung 52 verbunden und weist außerdem eine durch das Steuerventil 22 gesteuerte Verbindung 54 mit einem Entlastungsbereich auf, der beispielsweise ein Rücklauf in den Vorratsbehälter 12 ist. Wenn durch das Steuerventil 22 die Verbindung 54 des Steuerraums 48 mit dem Entlastungsbereich geschlossen ist, so herrscht im Steuerraum 48 Hochdruck wie im Druckraum 42, so dass das Einspritzventilglied 30 in seiner Schließstellung verbleibt und keine Kraftstoffeinspritzung erfolgt. Wenn das Steuerventil 22 geöffnet wird, so dass dieses die Verbindung 54 des Steuerraums 48 mit dem Entlastungsbereich geöffnet ist, so ist der Steuerraum 48 entlastet und das Einspritzventilglied 30 öffnet infolge des im Druckraum 42 auf dessen Druckschulter 44 wirkenden Hochdrucks, so dass Kraftstoff eingespritzt wird. Das Steuerventil 22 kann einen elektromagnetischen Aktor oder einen piezoelektrischen Aktor aufweisen.In addition, a control chamber 48 is formed in the injector body 28, which is delimited by the injection valve member 30 or a control piston 50 connected thereto, a force being generated in the closing direction on the injection valve member 30 by the pressure prevailing in the control chamber 48. The high-pressure line 18 is connected to the injector body 28 and within the injector 28 leads an inlet bore 52 to the pressure chamber 42. The control chamber 48 is also connected to the inlet bore 52 and also has a controlled by the control valve 22 connection 54 with a discharge area, the For example, a return to the reservoir 12 is. If closed by the control valve 22, the connection 54 of the control chamber 48 with the discharge area, so prevails in the control chamber 48 high pressure as in the pressure chamber 42, so that the injection valve member 30 remains in its closed position and no fuel injection. When the control valve 22 is opened so that it is the connection 54 of the control chamber 48 is opened with the discharge area, the control chamber 48 is relieved and the injection valve member 30 opens due to acting in the pressure chamber 42 on the pressure shoulder 44 high pressure, so that fuel is injected , The control valve 22 may include an electromagnetic actuator or a piezoelectric actuator.

In Figur 2 ist der Injektor 20 ausschnittsweise vergrößert gemäß einem ersten Ausführungsbeispiel dargestellt, wobei insbesondere der Anschluss der Kraftstoffleitung 18 erkennbar ist. In einem dem Brennraum des Zylinders abgewandten Teil des Injektorkörpers 28 ist eine Bohrung 60 vorgesehen, die an der Außenseite des Injektorkörpers 28 mündet. Die Bohrung 60 kann mit ihrer Längsachse 61 beispielsweise etwa parallel zur Längsachse des Einspritzventilglieds 30 oder leicht geneigt zur Längsachse des Einspritzventilglieds 30 verlaufen, wie dies in Figur 2 dargestellt ist. In die Bohrung 60 ist ein beispielsweise stabförmiger Kraftstofffilter 64 eingesetzt, so dass die Bohrung 60 nachfolgend als Filterbohrung bezeichnet wird. Die Filterbohrung 60 ist mit der zum Druckraum 42 und zum Steuerraum 48 führenden Zulaufbohrung 52 verbunden. In der Filterbohrung 60 ist ein Dichtsitz 66 vorgesehen, der an einer Querschnittsverringerung der Filterbohrung 60 gebildet ist, wobei die Filterbohrung 60 einen inneren Bohrungsabschnitt 62 mit kleinem Durchmesser aufweist, in dem der Kraftstofffilter 64 angeordnet ist, und einen äußeren Bohrungsabschnitt 63 mit größerem Durchmesser, der an der Außenseite des Injektorkörpers 28 mündet. Die beiden Bohrungsabschnitte 62 und 63 können auch denselben Durchmesser aufweisen. Der Dichtsitz 66 ist beispielsweise zumindest annähernd kegelstumpfförmig ausgebildet und dessen Längsachse 67 verläuft geneigt zur Längsachse 61 der Filterbohrung 60.In FIG. 2 the injector 20 is shown enlarged in sections according to a first embodiment, in particular, the connection of the fuel line 18 can be seen. In a side facing away from the combustion chamber of the cylinder part of the injector body 28, a bore 60 is provided, which opens on the outside of the injector body 28. The bore 60 may extend with its longitudinal axis 61, for example approximately parallel to the longitudinal axis of the injection valve member 30 or slightly inclined to the longitudinal axis of the injection valve member 30, as shown in FIG FIG. 2 is shown. In the bore 60, for example, a rod-shaped fuel filter 64 is used, so that the bore 60 is referred to below as a filter bore. The filter bore 60 is connected to the pressure bore 42 and the control chamber 48 leading inlet bore 52. In the filter bore 60, a sealing seat 66 is provided, which is formed at a cross-sectional reduction of the filter bore 60, wherein the filter bore 60 has an inner bore portion 62 of small diameter, in which the fuel filter 64 is disposed, and a outer bore portion 63 of larger diameter, which opens at the outside of the injector body 28. The two bore sections 62 and 63 may also have the same diameter. The sealing seat 66 is formed, for example, at least approximately frusto-conical and its longitudinal axis 67 extends inclined to the longitudinal axis 61 of the filter bore 60th

Im Teil des Injektorkörpers 28 ist eine weitere an dessen Außenseite mündende Bohrung 68 vorgesehen, die zumindest annähernd koaxial zum Dichtsitz 66 verläuft und in die der Endbereich der Kraftstoffleitung 18 eintaucht. Die Bohrung 68 ist mit einem Innengewinde 69 versehen. Am Endbereich der Kraftstoffleitung 18 ist eine Verdickung 70 vorgesehen, an deren Außenmantel eine am Dichtsitz 66 zur Anlage kommende Dichtfläche 72 angeordnet ist, die entsprechend dem Dichtsitz 66 zumindest annähernd kegelstumpfförmig ausgebildet sein kann oder auch beispielsweise zumindest annähernd kugelförmig ausgebildet sein kann. Auf der der Dichtfläche 72 abgewandten Seite der Verdickung 70 der Kraftstoffleitung 18 ist eine Ringschulter 74 ausgebildet. Auf dem Endbereich der Kraftstoffleitung 18 ist eine Hohlschraube 76 angeordnet, deren Innendurchmesser kleiner ist als der Außendurchmesser der Verdickung 70 der Kraftstoffleitung 18. Die Hohlschraube 76 ist mit ihrem Außengewinde 77 in das Innengewinde 69 der Bohrung 68 des Injektorkörpers 28 eingeschraubt. Die Hohlschraube 76 kommt mit ihrer Stirnseite in axialer Richtung an der Ringschulter 74 der Verdickung 70 der Kraftstoffleitung 18 zur Anlage, wodurch die Verdickung 70 mit ihrer Dichtfläche 72 gegen den Dichtsitz 66 gepresst wird. Die Hohlschraube 76 ist an ihrem aus der Bohrung 68 ragenden Ende beispielsweise mit einem Sechskantprofil 78 oder einem Vielzahnprofil versehen, an dem ein Werkzeug angesetzt werden kann, um die Hohlschraube 76 zu befestigen.In the part of the injector body 28 there is provided a further bore 68 opening out on the outside thereof, which extends at least approximately coaxially with the sealing seat 66 and into which the end region of the fuel line 18 dips. The bore 68 is provided with an internal thread 69. At the end region of the fuel line 18, a thickening 70 is provided, on the outer shell of a sealing seat 66 to the abutting sealing surface 72 is arranged, which may be at least approximately frusto-conical corresponding to the sealing seat 66 or, for example, at least approximately spherical. On the side facing away from the sealing surface 72 of the thickening 70 of the fuel line 18, an annular shoulder 74 is formed. On the end region of the fuel line 18, a hollow screw 76 is arranged, whose inner diameter is smaller than the outer diameter of the thickening 70 of the fuel line 18. The hollow screw 76 is screwed with its external thread 77 in the internal thread 69 of the bore 68 of the injector body 28. The hollow screw 76 comes with its end face in the axial direction of the annular shoulder 74 of the thickening 70 of the fuel line 18 to the system, whereby the thickening 70 is pressed with its sealing surface 72 against the sealing seat 66. The hollow screw 76 is provided at its protruding from the bore 68 end, for example with a hexagonal profile 78 or a splined profile on which a tool can be attached to secure the hollow screw 76.

Durch den in die Bohrung 68 eintauchenden Endbereich der Kraftstoffleitung 18 wird der äußere Bohrungsabschnitt 63 der Filterbohrung 60 von dem inneren Bohrungsabschnitt 62 getrennt, wobei nur der innere Bohrungsabschnitt 62, in dem der Kraftstofffilter 64 angeordnet ist, hochdruckbeaufschlagt ist, wobei dessen Abdichtung durch die gegen den Dichtsitz 66 gepresste Kraftstoffleitung 18 erfolgt. Die Lage der weiteren Bohrung 68 und des Dichtsitzes 66 kann abhängig von den Platzverhältnissen unabhängig von der Lage der Filterbohrung 60 gewählt werden.By dipping into the bore 68 end portion of the fuel line 18, the outer bore portion 63 of the filter bore 60 is separated from the inner bore portion 62, wherein only the inner bore portion 62, in which the fuel filter 64 is disposed, is subjected to high pressure, the seal by the against the sealing seat 66 pressed fuel line 18 takes place. The position of the further bore 68 and the sealing seat 66 can be selected independently of the position of the filter bore 60 depending on the space available.

In Figur 3 ist der Injektor 20 ausschnittsweise gemäß einem zweiten Ausführungsbeispiel dargestellt, bei dem der grundsätzliche Aufbau gleich ist wie beim ersten Ausführungsbeispiel. Die weitere Bohrung 68, in die der Endbereich der Kraftstoffleitung 18 eintaucht, ist dabei in einem vom Injektorkörper 28 abstehenden Stutzen 80 ausgebildet, der mit einem Außengewinde 81 versehen ist. Die Filterbohrung 60 durchdringt den Stutzen 80 des Injektorkörpers 28. Am Ende der Kraftstoffleitung 18 ist die Verdickung 70 angeordnet, die die dem Dichtsitz 66 zugewandte Dichtfläche 72 und die dieser abgewandte Ringschulter 74 aufweist. Auf dem Endbereich der Kraftstoffleitung 18 ist eine Hülse 82 angeordnet, deren Innendurchmesser kleiner ist als der Außendurchmesser der Verdickung 70, so dass die Hülse 82 mit ihrer Stirnseite in axialer Richtung an der Ringschulter 74 der Verdickung 70 zur Anlage kommt. Die Hülse 82 taucht zusammen mit dem Endbereich der Kraftstoffleitung 18 in die Bohrung 68 ein. Auf dem Endbereich der Kraftstoffleitung 18 ist außerdem eine die Hülse 82 umgebende Überwurfmutter 84 angeordnet, die an einem Ende einen kleineren Innendurchmesser aufweist als der Außendurchmesser der Hülse 82, so dass die Überwurfmutter 84 an der Hülse 82 in axialer Richtung zur Anlage kommt. Die Überwurfmutter 84 ist mit ihrem Innengewinde 85 auf das Außengewinde 81 des Stutzens 80 am Injektorkörper 28 aufgeschraubt und weist an ihrem Außenmantel beispielsweise ein Sechskantprofil 86 auf, an dem ein Werkzeug angesetzt werden kann. Auch beim zweiten Ausführungsbeispiel wird durch den in die Bohrung 68 eintauchenden Endbereich der Kraftstoffleitung 18 der äußere Bohrungsabschnitt 63 der Filterbohrung 60 von dem inneren Bohrungsabschnitt 62 getrennt, wobei nur der innere Bohrungsabschnitt 62, in dem der Kraftstofffilter 64 angeordnet ist, hochdruckbeaufschlagt ist, und dessen Abdichtung durch die gegen den Dichtsitz 66 gepresste Kraftstoffleitung 18 erfolgt.In FIG. 3 the injector 20 is shown in sections according to a second embodiment, in which the basic structure is the same as in the first embodiment. The further bore 68, into which the end region of the fuel line 18 dips, is formed in a protruding from the injector body 28 stub 80 which is provided with an external thread 81. The filter bore 60 penetrates the nozzle 80 of the injector body 28. At the end of the fuel line 18, the thickening 70 is arranged, which has the sealing face 72 facing the sealing seat 66 and the annular shoulder 74 facing away from the latter. On the end region of the fuel line 18, a sleeve 82 is arranged, whose inner diameter is smaller than the outer diameter of the thickening 70, so that the sleeve 82 comes with its front side in the axial direction of the annular shoulder 74 of the thickening 70 for conditioning. The sleeve 82 dips into the bore 68 together with the end portion of the fuel line 18. On the end region of the fuel line 18 also a sleeve 82 surrounding the union nut 84 is arranged, which has at one end a smaller inner diameter than the outer diameter of the sleeve 82, so that the union nut 84 on the sleeve 82 in the axial direction Plant comes. The union nut 84 is screwed with its internal thread 85 on the external thread 81 of the nozzle 80 on the injector body 28 and has on its outer shell, for example, a hexagonal profile 86 to which a tool can be attached. Also in the second embodiment, by the end portion of the fuel passage 18 immersed in the bore 68, the outer bore portion 63 of the filter bore 60 is separated from the inner bore portion 62, with only the inner bore portion 62 in which the fuel filter 64 is pressurized, and its Seal by the pressed against the sealing seat 66 fuel line 18 takes place.

In Figur 4 ist der Injektor 20 ausschnittsweise gemäß einer gegenüber Figur 3 geringfügig modifizierten Ausführung dargestellt, wobei die Verdickung 70 am Endbereich der Kraftstoffleitung 18 eine wesentlich größere Erstreckung in Richtung der Längsachse der Kraftstoffleitung 18 aufweist. Die Verdickung 70 erstreckt sich dabei bis zum Ende des Stutzens 80, so dass die Überwurfmutter 84 direkt an der Ringschulter 74 der Verdickung 70 angreifen kann und die Hülse 82 der Ausführung gemäß Figur 3 entfallen kann.In FIG. 4 the injector 20 is fragmentary according to one opposite FIG. 3 shown slightly modified embodiment, wherein the thickening 70 at the end region of the fuel line 18 has a substantially greater extent in the direction of the longitudinal axis of the fuel line 18. The thickening 70 extends to the end of the nozzle 80, so that the coupling nut 84 can act directly on the annular shoulder 74 of the thickening 70 and the sleeve 82 of the embodiment according to FIG. 3 can be omitted.

Zusätzlich zu der Hochdruck führenden Kraftstoffleitung 18 kann am Injektorkörper 28 auch eine Entlastungskraftstoffleitung 90 angeschlossen sein, durch die bei göffnetem Steuerventil 22 aus dem Steuerraum 48 abgesteuerter Kraftstoff zumindest mittelbar in den Vorratsbehälter 12 abgeleitet wird. Außerdem sind am Injektorkörper 28 elektrische Leitungen 92 angeschlossen für die Kontaktierung des elektrischen Aktors des Steuerventils 22.In addition to the high-pressure-carrying fuel line 18, a relief fuel line 90 can be connected to the injector body 28, at least indirectly discharging fuel discharged from the control chamber 48 when the control valve 22 is open. In addition, 28 electrical lines 92 are connected to the injector body for contacting the electrical actuator of the control valve 22nd

Claims (5)

  1. Injector for injecting fuel in an internal combustion engine, which injector has an injector body (28) to which is connected a fuel line (18) through which highly pressurized fuel is supplied, with a filter bore (60) being provided in the injector body (28), in which filter bore (60) is arranged a fuel filter (64) through which the supplied fuel flows, with a sealing seat (66) being formed in the filter bore (60), against which sealing seat (66) the end (70) of the fuel line (18) is pressed as it is fastened to the injector body (28), characterized in that the filter bore (60) opens out at the outer side of the injector body (28), in that the sealing seat (66) is inclined with its longitudinal axis (67) with respect to the longitudinal axis (61) of the filter bore (60), in that a bore (68) which runs at least approximately coaxially with respect to the sealing seat (66) is provided in the injector body (28), into which bore (68) the end region of the fuel line (18) protrudes, in that the end region of the fuel line (18) which protrudes into the bore (68) serves to separate an outer end region (63), which opens out at the outer side of the injector body (28), of the filter bore (60) from an inner end region (62), which is acted on with high pressure, of the filter bore (60), and in that the fuel filter (64) is arranged in the inner end region (62) of the filter bore (60).
  2. Injector according to Claim 1, characterized in that the bore (68) has an internal thread (69), and in that a hollow screw (76) is arranged on the end region of the fuel line (18), which hollow screw (76) is screwed with its external thread (77) into the internal thread (69) of the bore (68), and by means of which hollow screw (76) the end (70) of the fuel line (18) is pressed against the sealing seat (66).
  3. Injector according to Claim 1, characterized in that the bore (68) runs in a connecting piece (80) which projects from the injector body (28), which connecting piece (80) is provided with an external thread (81), and in that a cap nut (84) is arranged on the end region of the fuel line, which cap nut (84) is screwed with its internal thread (85) onto the external thread (81) of the connecting piece (80), and by means of which cap nut (84) the end (70) of the fuel line (18) is at least indirectly pressed against the sealing seat (66).
  4. Injector according to Claim 3, characterized in that a sleeve (82) which protrudes into the bore (68) is arranged on the end region of the fuel line (18) within the cap nut (84), against which sleeve (82) the cap nut (84) comes into contact in the axial direction and by means of which sleeve (82) the end (70) of the fuel line (18) is pressed against the sealing seat (66).
  5. Injector according to Claim 3 or 4, characterized in that the filter bore (60) extends through the connecting piece (80) of the injector body (28).
EP05766805A 2004-09-28 2005-07-18 Fuel injector on an internal combustion engine Not-in-force EP1797314B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004046888A DE102004046888A1 (en) 2004-09-28 2004-09-28 Injector for fuel injection on an internal combustion engine
PCT/EP2005/053430 WO2006034890A1 (en) 2004-09-28 2005-07-18 Fuel injector on an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1797314A1 EP1797314A1 (en) 2007-06-20
EP1797314B1 true EP1797314B1 (en) 2008-04-16

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EP05766805A Not-in-force EP1797314B1 (en) 2004-09-28 2005-07-18 Fuel injector on an internal combustion engine

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US (1) US7878427B2 (en)
EP (1) EP1797314B1 (en)
JP (1) JP4532557B2 (en)
AT (1) ATE392547T1 (en)
DE (2) DE102004046888A1 (en)
ES (1) ES2302217T3 (en)
WO (1) WO2006034890A1 (en)

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JP5218583B2 (en) * 2011-03-09 2013-06-26 株式会社デンソー Injector

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Publication number Publication date
DE502005003776D1 (en) 2008-05-29
EP1797314A1 (en) 2007-06-20
WO2006034890A1 (en) 2006-04-06
DE102004046888A1 (en) 2006-03-30
ES2302217T3 (en) 2008-07-01
JP4532557B2 (en) 2010-08-25
ATE392547T1 (en) 2008-05-15
JP2008514856A (en) 2008-05-08
US20080093481A1 (en) 2008-04-24
US7878427B2 (en) 2011-02-01

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