EP1544455B1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP1544455B1
EP1544455B1 EP20040105650 EP04105650A EP1544455B1 EP 1544455 B1 EP1544455 B1 EP 1544455B1 EP 20040105650 EP20040105650 EP 20040105650 EP 04105650 A EP04105650 A EP 04105650A EP 1544455 B1 EP1544455 B1 EP 1544455B1
Authority
EP
European Patent Office
Prior art keywords
section
fuel injection
injection valve
elevation
hold
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.)
Expired - Fee Related
Application number
EP20040105650
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German (de)
French (fr)
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EP1544455A3 (en
EP1544455A2 (en
Inventor
Andreas Eckbauer
Bernd Hollerbaum
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Publication date
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Publication of EP1544455A2 publication Critical patent/EP1544455A2/en
Publication of EP1544455A3 publication Critical patent/EP1544455A3/en
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Publication of EP1544455B1 publication Critical patent/EP1544455B1/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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting 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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails

Definitions

  • the invention relates to a fuel injection system according to the preamble of the main claim.
  • a fuel injection system with a fuel distribution line, a tubular intermediate piece with two annular seals, a sleeve-shaped securing element and a clamping claw known.
  • the fuel distribution line opens via the intermediate piece in the fuel injection valve, wherein the intermediate piece is axially displaceable and thereby an axial clearance is possible.
  • the securing element limits the axial play.
  • the clamping claw presses the fuel injection valve against a cylinder head via a flange formed on the fuel injection valve. The clamping claw is attached separately from the fuel rail to the cylinder head and is supported on this.
  • a disadvantage of the fuel injection valve known from the above document is in particular that the assembly cost is unfavorably high in the assembly of the fuel injection valve with the fuel distribution line. By the high number of necessary for the attachment and fuel supply components and the production costs are increased.
  • the spring clip includes a first portion having a bridge connecting two spaced-apart and S-shaped bent finger portions to span a body portion of the valve.
  • the spring clamp is intended to hold a fuel injector and rail cup together, allowing the fuel injector to push in the direction of the engine head.
  • the spring clamp is biased during installation and applies a spring force ranging from a minimum force to a maximum force when the clamp is compressed.
  • the spring clamp is designed to prevent overload of the injector at the maximum force while being fixed with a maximum elastic load.
  • the fuel injection system according to the invention with the characterizing features of the main claim has the advantage that the assembly of the fuel injection system can be done much easier and the necessary components can be made easier and with less manufacturing effort and are reduced in number.
  • the hold-down section is supported directly on the allocation section.
  • the bias voltage generated by the hold-down portion can be determined very accurately by the position of the allocation portion.
  • the hold-down portion has a receiving opening, which opens out of a survey, wherein the survey is shaped so that the survey at least partially embracing upper portion is positively against the survey joined positively.
  • the hold-down portion can be mounted simplified with respect to a certain angle about the longitudinal axis of the receiving opening and aligned permanently.
  • the survey has a nose and / or is oval shaped.
  • a rotation-proof geometry of the survey can be generated in a simple manner, which also simplifies the installation of the hold-down with the survey.
  • the lower section has spring arms with positioning surfaces.
  • the positioning surfaces advantageously engage in an exact fit in a coding section arranged on the fuel injection valve, wherein the coding section, together with the position of the positioning surfaces, determines the angle of rotation or the installation position of the fuel injection valve with respect to its orientation about the longitudinal axis.
  • An in Fig. 1 illustrated embodiment of the fuel injection system according to the invention is used in particular for elastic hold down a fuel injection valve 3 and for supplying fuel to the fuel injection valve 3 and has an allocation section 1 and a hold-down section 2.
  • the fuel injection valve 3 is supplied with pressurized fuel.
  • the hold-down section 2 the fuel injection valve 3 is biased against an example formed on a cylinder head, not shown bearing surface.
  • the force which acts on the fuel injection valve 3 through the hold-down section 2, for example, is greater than a force acting on the fuel injection valve 3 in a combustion chamber, not shown.
  • the hold-down portion 2 is elastic and can thereby compensate for the occurring axial tolerances. Pressure surges or pressure fluctuations, which act axially, for example, from the combustion chamber, not shown, on the fuel injection valve 3, can be absorbed elastic gentle material, for example, an elastic seal, not shown, reliably seals the combustion chamber in axial play.
  • the allocation portion 1 has a plurality of bores 8 for receiving connecting elements, not shown, wherein the bores 8 are partially formed on the allocation portion 1 formed flanges 7 and extend in the embodiment with their longitudinal axes parallel to the longitudinal axis of a receiving opening 6.
  • the allocation section 1 consists in the embodiment shown of a tubular line section 4 and a connection section 5.
  • the connection section 5 has on its underside 9 a survey 10, from which the receiving opening 6 opens to receive the inflow-side end of the fuel injection valve 3.
  • the mouth of the receiving opening 6 is offset by the elevation 10 of the surrounding bottom 9 and protrudes from the bottom 9 of the connecting portion. 5 out.
  • the elevation 10 is formed, for example, by the formation of a nose 15 or by an oval shape stretched in one direction.
  • the hold-down portion 2 is permanently elastic, for example, made of spring steel and U-shaped.
  • the staple-like shape of the hold-down portion 2 has an upper portion 11 facing the terminal portion 5 and a lower portion 12 opposite the upper portion 11, which is further away from the terminal portion 5 than the upper portion 11.
  • the upper portion 11 bifurcates in two parallel to each other extending upper spring arms 13 and the lower portion 12 forks into two mutually parallel lower spring arms 14.
  • the upper spring arms 13 are each slightly elastically movable away from each other as the lower spring arms 14.
  • the hold-down section 2 is already mounted on the connection section 5, wherein the upper spring arms 13 embrace the survey 10, for example, with a bias voltage.
  • the inner shape of the upper spring arms 13 is adapted to the shape of the elevation 10.
  • the upper spring arms 13 can advantageously act with a bias radially on the elevation 10, whereby the hold-down portion 2 is joined non-positively in the axial direction and radial direction with the survey 10.
  • the hold-down section 2 is pushed radially, for example, for mounting on the survey 10 and deducted for disassembly axially.
  • the lower spring arms 14 have at their sides facing each other positioning surfaces 16.
  • the shape of a lying in the region of the inflow-side end of the fuel injection valve 3 Kodierabitess 19, engages in the lower spring arms 14, is formed so that the fuel injection valve 3 with respect to a rotation angle or more rotational angle about the longitudinal axis of the fuel injection valve 3 is precisely aligned, or can be installed only aligned.
  • the positioning surfaces 16 secure a rotation of the fuel injection valve 3 about its longitudinal axis by positive engagement.
  • the center of the lower spring arms 14 advantageously have a cap 17 through which the lower spring arms 14 are bent away in the middle of the receiving opening 6.
  • Fig. 2 clearly visible surround in this figure, the lower spring arms 14 the inflow-side region of the fuel injection valve 3.
  • the Kodierabites 19 is shaped according to the shape of the two positioning surfaces 16 and is ideally to this exact fit. In this case, the fuel injection valve 3 is secured against rotation about its longitudinal axis.
  • the lower portion 12 In the mounted state of the fuel injection system according to the invention, for example, on a cylinder head, not shown, the lower portion 12 is biased against the fuel injection valve 3 and presses on a fuel injection valve 3 fixed support ring 18, wherein the hold-down portion 2 at the allocation section 1 on the upper portion 11th supported.
  • the support ring 18 and the coding section 19 are made in one piece in the embodiment shown.
  • for vibration damping can be arranged between the upper portion 11 and the bottom 9, not shown permanently elastic intermediate layer.
  • the lower portion 12 is slightly moved during assembly against the upper portion 11, whereby the lower portion 12 elastically biases against the fuel injection valve 3. Through the calotte 17, with the lower portion 12 preferably rests on the support ring 18, it is prevented that radially directed forces acting on the fuel injection valve 3.
  • Fig. 3 shows a possible embodiment of the Kodierabitess 19 of the fuel injection valve 3.
  • the coding section 19 has two tangential to the longitudinal axis 21 of the fuel injection valve 3 and straight incisions 20 which extend parallel to each other in the embodiment.
  • the coding portion 19 may be integral or separate with the fuel injection valve 3, for example, as a sleeve, not shown, which is for example pressed or welded to the fuel injection valve 3 in the desired position.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzsystem nach der Gattung des Hauptanspruchs.The invention relates to a fuel injection system according to the preamble of the main claim.

Beispielsweise ist aus der DE 197 35 665 A1 eine Brennstoffeinspritzanlage mit einer Brennstoffverteilerleitung, einem rohrförmigen Zwischenstück mit zwei ringförmigen Dichtungen, einem hülsenförmigen Sicherungselement und einer Spannpratze bekannt. Die Brennstoffverteilerleitung mündet über das Zwischenstück in das Brennstoffeinspritzventil, wobei das Zwischenstück axial verschiebbar ist und dadurch ein axiales Spiel möglich ist. Das Sicherungselement begrenzt das axiale Spiel. Die Spannpratze drückt über einen am Brennstoffeinspritzventil ausgebildeten Flansch das Brennstoffeinspritzventil gegen einen Zylinderkopf. Die Spannpratze ist getrennt von der Brennstoffverteilerleitung am Zylinderkopf befestigt und stützt sich an diesem ab.For example, is from the DE 197 35 665 A1 a fuel injection system with a fuel distribution line, a tubular intermediate piece with two annular seals, a sleeve-shaped securing element and a clamping claw known. The fuel distribution line opens via the intermediate piece in the fuel injection valve, wherein the intermediate piece is axially displaceable and thereby an axial clearance is possible. The securing element limits the axial play. The clamping claw presses the fuel injection valve against a cylinder head via a flange formed on the fuel injection valve. The clamping claw is attached separately from the fuel rail to the cylinder head and is supported on this.

Nachteilig bei dem aus der obengenannten Druckschrift bekannten Brennstoffeinspritzventil ist insbesondere, daß der Montageaufwand bei der Montage des Brennstoffeinspritzventils mit der Brennstoffverteilerleitung unvorteilhaft hoch ist. Durch die hohe Zahl der für die Befestigung und Brennstoffzuführung notwendigen Bauelemente sind auch die Herstellungskosten gesteigert.A disadvantage of the fuel injection valve known from the above document is in particular that the assembly cost is unfavorably high in the assembly of the fuel injection valve with the fuel distribution line. By the high number of necessary for the attachment and fuel supply components and the production costs are increased.

In der WO 00/42315 A wird eine Federklemme für ein Hochdruckeinspritzventil beschrieben. Die Federklemme umfasst einen ersten Abschnitt, der eine Brücke aufweist, die zwei voneinander beabstandete und S-förmig gebogene Fingerabschnitte verbindet, um einen Körperabschnitt des Ventils zu überspannen. Die Federklemme ist dazu bestimmt ein Brennstoffeinspritzventil und Railtasse zusammenzuhalten, so dass das Brennstoffeinspritzventil in die Richtung des Motorkopfes zu drücken. Die Federklemme wird während des Einbaus vorgespannt und bringt eine Federkraft auf, welche von einer Minimalkraft bis zu einer Maximalkraft reicht, wenn die Klemme komprimiert wird. Die Federklemme ist dazu bestimmt, bei der Maximalkraft eine Überlastung des Einspritzventils zu verhindern, während es mit einer maximalen elastischen Belastung fixiert wird.In the WO 00/42315 A a spring clamp for a high-pressure injection valve will be described. The spring clip includes a first portion having a bridge connecting two spaced-apart and S-shaped bent finger portions to span a body portion of the valve. The spring clamp is intended to hold a fuel injector and rail cup together, allowing the fuel injector to push in the direction of the engine head. The spring clamp is biased during installation and applies a spring force ranging from a minimum force to a maximum force when the clamp is compressed. The spring clamp is designed to prevent overload of the injector at the maximum force while being fixed with a maximum elastic load.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzsystem mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Montage des Brennstoffeinspritzsystems erheblich einfacher erfolgen kann und die dafür notwendigen Bauelemente einfacher und mit weniger Fertigungsaufwand hergestellt werden können und in ihrer Anzahl verringert sind.The fuel injection system according to the invention with the characterizing features of the main claim has the advantage that the assembly of the fuel injection system can be done much easier and the necessary components can be made easier and with less manufacturing effort and are reduced in number.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen des im Hauptanspruch angegebenen Brennstoffeinspritzsystems möglich. Vorteilhafterweise stützt sich der Niederhalteabschnitt unmittelbar am Zuteilungsabschnitt ab. Dadurch kann die durch den Niederhalteabschnitt erzeugte Vorspannung sehr genau durch die Lage des Zuteilungsabschnitts bestimmt werden.The measures listed in the dependent claims advantageous developments of the fuel injection system specified in the main claim are possible. Advantageously, the hold-down section is supported directly on the allocation section. Thereby, the bias voltage generated by the hold-down portion can be determined very accurately by the position of the allocation portion.

Der Niederhalteabschnitt weist eine Aufnahmeöffnung auf, welche aus einer Erhebung ausmündet, wobei die Erhebung so geformt ist, daß der die Erhebung wenigstens teilweise umgreifende obere Abschnitt verdrehsicher mit der Erhebung formschlüssig gefügt ist. Dadurch kann der Niederhalteabschnitt bezüglich eines bestimmten Winkels um die Längsachse der Aufnahmeöffnung vereinfacht montiert werden und dauerhaft ausgerichtet werden.The hold-down portion has a receiving opening, which opens out of a survey, wherein the survey is shaped so that the survey at least partially embracing upper portion is positively against the survey joined positively. As a result, the hold-down portion can be mounted simplified with respect to a certain angle about the longitudinal axis of the receiving opening and aligned permanently.

Vorteilhafterweise weist die Erhebung eine Nase auf und/oder ist oval geformt. Dadurch läßt sich in einfacher Weise eine verdrehsichere Geometrie der Erhebung erzeugen, die außerdem die Montage des Niederhalteabschnitts mit der Erhebung vereinfacht.Advantageously, the survey has a nose and / or is oval shaped. As a result, a rotation-proof geometry of the survey can be generated in a simple manner, which also simplifies the installation of the hold-down with the survey.

In einer weiteren Weiterbildung des erfindungsgemäßen Brennstoffeinspritzsystems weist der untere Abschnitt Federarme mit Positionierungsflächen auf. Die Positionierungsflächen greifen vorteilhafterweise in einen am Brennstoffeinspritzventil angeordneten Kodierabschnitt passgenau ein, wobei der Kodierabschnitt zusammen mit der Lage der Positionierungsflächen den Drehwinkel bzw. die Einbaulage des Brennstoffeinspritzventils bezüglich seiner Orientierung um die Längsachse bestimmt. Dadurch ist eine sehr einfache und fehlersichere winkelausgerichtete Montage des Brennstoffeinspritzventils möglich.In a further development of the fuel injection system according to the invention, the lower section has spring arms with positioning surfaces. The positioning surfaces advantageously engage in an exact fit in a coding section arranged on the fuel injection valve, wherein the coding section, together with the position of the positioning surfaces, determines the angle of rotation or the installation position of the fuel injection valve with respect to its orientation about the longitudinal axis. As a result, a very simple and fail-safe angle-aligned mounting of the fuel injection valve is possible.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
eine schematische Teildarstellung eines Ausführungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzsystems,
Fig. 2
eine schematische Darstellung des erfindungsgemäßen Ausführungsbeispiels des Brennstoffeinspritzsystems mit einem Brennstoffeinspritzventil und
Fig. 3
eine mögliche Ausführungsform des Kodierabschnitts 19 des Brennstoffeinspritzventils 3.
Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
FIG. 2 a schematic partial representation of an exemplary embodiment of a fuel injection system according to the invention, FIG.
Fig. 2
a schematic representation of the embodiment of the fuel injection system according to the invention with a fuel injection valve and
Fig. 3
a possible embodiment of the Kodierabschnitts 19 of the fuel injection valve. 3

Beschreibung des AusführungsbeispielsDescription of the embodiment

Nachfolgend wird ein Ausführungsbeispiel der Erfindung beispielhaft beschrieben. Übereinstimmende Bauteile sind dabei in den Figuren mit übereinstimmenden Bezugszeichen versehen.Hereinafter, an embodiment of the invention will be described by way of example. Matching components are provided in the figures with corresponding reference numerals.

Ein in Fig. 1 dargestelltes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzsystems dient insbesondere zum elastischen Niederhalten eines Brennstoffeinspritzventils 3 und zur Zuführung von Brennstoff an das Brennstoffeinspritzventil 3 und weist einen Zuteilungsabschnitt 1 und einem Niederhalteabschnitt 2 auf. In dem Zuteilungsabschnitt 1 wird dem Brennstoffeinspritzventil 3 Brennstoff druckbehaftet zugeleitet. Durch den Niederhalteabschnitt 2 wird das Brennstoffeinspritzventil 3 gegen eine beispielsweise an einem nicht dargestellten Zylinderkopf ausgebildeten Auflagefläche vorgespannt. Die Kraft, welche durch den Niederhalteabschnitt 2 auf das Brennstoffeinspritzventil 3 wirkt, ist beispielsweise größer als eine in einem nicht dargestellten Brennraum auf das Brennstoffeinspritzventil 3 wirkende Kraft. Der Niederhalteabschnitt 2 ist elastisch ausgebildet und kann dadurch die auftretenden axialen Toleranzen ausgleichen. Druckstöße oder Druckschwankungen, welche beispielsweise aus dem nicht dargestellten Brennraum auf das Brennstoffeinspritzventil 3 axial wirken, können materialschonend elastisch abgefangen werden, wobei beispielsweise eine nicht dargestellte elastische Dichtung den Brennraum bei axialem Spiel zuverlässig abdichtet.An in Fig. 1 illustrated embodiment of the fuel injection system according to the invention is used in particular for elastic hold down a fuel injection valve 3 and for supplying fuel to the fuel injection valve 3 and has an allocation section 1 and a hold-down section 2. In the allocation section 1, the fuel injection valve 3 is supplied with pressurized fuel. By the hold-down section 2, the fuel injection valve 3 is biased against an example formed on a cylinder head, not shown bearing surface. The force which acts on the fuel injection valve 3 through the hold-down section 2, for example, is greater than a force acting on the fuel injection valve 3 in a combustion chamber, not shown. The hold-down portion 2 is elastic and can thereby compensate for the occurring axial tolerances. Pressure surges or pressure fluctuations, which act axially, for example, from the combustion chamber, not shown, on the fuel injection valve 3, can be absorbed elastic gentle material, for example, an elastic seal, not shown, reliably seals the combustion chamber in axial play.

Der Zuteilungsabschnitt 1 weist mehrere Bohrungen 8 zur Aufnahme von nicht dargestellten Verbindungselementen auf, wobei die Bohrungen 8 teilweise an am Zuteilungsabschnitt 1 ausgebildeten Flanschen 7 eingebracht sind und im Ausführungsbeispiel mit ihren Längsachsen parallel zur Längsachse einer Aufnahmeöffnung 6 verlaufen. Der Zuteilungsabschnitt 1 besteht im gezeigten Ausführungsbeispiel aus einem rohrförmigen Leitungsabschnitt 4 und einem Anschlußabschnitt 5. Der Anschlußabschnitt 5 weist auf seiner Unterseite 9 eine Erhebung 10 auf, aus welcher die Aufnahmeöffnung 6 zur Aufnahme des zuströmseitigen Endes des Brennstoffeinspritzventils 3 ausmündet. Die Ausmündung der Aufnahmeöffnung 6 ist durch die Erhebung 10 von der umgebenden Unterseite 9 abgesetzt und ragt aus der Unterseite 9 des Anschlußabschnitts 5 hervor. Die Erhebung 10 ist beispielsweise durch die Ausbildung einer Nase 15 oder durch eine ovale Form in einer Richtung gestreckt ausgebildet.The allocation portion 1 has a plurality of bores 8 for receiving connecting elements, not shown, wherein the bores 8 are partially formed on the allocation portion 1 formed flanges 7 and extend in the embodiment with their longitudinal axes parallel to the longitudinal axis of a receiving opening 6. The allocation section 1 consists in the embodiment shown of a tubular line section 4 and a connection section 5. The connection section 5 has on its underside 9 a survey 10, from which the receiving opening 6 opens to receive the inflow-side end of the fuel injection valve 3. The mouth of the receiving opening 6 is offset by the elevation 10 of the surrounding bottom 9 and protrudes from the bottom 9 of the connecting portion. 5 out. The elevation 10 is formed, for example, by the formation of a nose 15 or by an oval shape stretched in one direction.

Der Niederhalteabschnitt 2 ist dauerelastisch, beispielsweise aus Federstahl gefertigt und U-förmig ausgebildet. Die klammerartige Form des Niederhalteabschnitts 2 weist einen zum Anschlußabschnitt 5 gerichteten oberen Abschnitt 11 und einen dem oberen Abschnitt 11 gegenüberliegenden unteren Abschnitt 12 auf, der vom Anschlußabschnitt 5 weiter entfernt ist als der obere Abschnitt 11. Der obere Abschnitt 11 gabelt sich in zwei zueinander parallel verlaufende obere Federarme 13 und der untere Abschnitt 12 gabelt sich in zwei zueinander parallel verlaufende untere Federarme 14. Die oberen Federarme 13 sind wie die unteren Federarme 14 jeweils geringfügig elastisch voneinander weg bewegbar.The hold-down portion 2 is permanently elastic, for example, made of spring steel and U-shaped. The staple-like shape of the hold-down portion 2 has an upper portion 11 facing the terminal portion 5 and a lower portion 12 opposite the upper portion 11, which is further away from the terminal portion 5 than the upper portion 11. The upper portion 11 bifurcates in two parallel to each other extending upper spring arms 13 and the lower portion 12 forks into two mutually parallel lower spring arms 14. The upper spring arms 13 are each slightly elastically movable away from each other as the lower spring arms 14.

In der Fig. 1 ist der Niederhalteabschnitt 2 bereits auf dem Anschlußabschnitt 5 montiert, wobei die oberen Federarme 13 die Erhebung 10 beispielsweise mit einer Vorspannung umgreifen. Die innere Form der oberen Federarme 13 ist der Form der Erhebung 10 angepaßt. Durch die ovale Form bzw. durch die Nase 15 ist der Niederhalteabschnitt 2 um die Längsachse der Aufnahmeöffnung 6 relativ zum Anschlußabschnitt 5 definiert formschlüssig winkelausgerichtet und in radialer Richtung formschlüssig mit der Erhebung 10 gefügt. Die oberen Federarme 13 können vorteilhafterweise mit einer Vorspannung radial auf die Erhebung 10 wirken, wodurch der Niederhalteabschnitt 2 in axialer Richtung und radialer Richtung kraftschlüssig mit der Erhebung 10 gefügt ist. Der Niederhalteabschnitt 2 wird beispielsweise zur Montage radial auf die Erhebung 10 aufgeschoben und zur Demontage axial abgezogen.In the Fig. 1 the hold-down section 2 is already mounted on the connection section 5, wherein the upper spring arms 13 embrace the survey 10, for example, with a bias voltage. The inner shape of the upper spring arms 13 is adapted to the shape of the elevation 10. By the oval shape or by the nose 15 of the hold-down portion 2 is defined relative to the terminal portion 5 relative to the terminal portion 5 form-fitting angularly aligned and joined positively in the radial direction with the survey 10 about the longitudinal axis of the receiving opening. The upper spring arms 13 can advantageously act with a bias radially on the elevation 10, whereby the hold-down portion 2 is joined non-positively in the axial direction and radial direction with the survey 10. The hold-down section 2 is pushed radially, for example, for mounting on the survey 10 and deducted for disassembly axially.

Die unteren Federarme 14 weisen an ihren zueinander gerichteten Seiten Positionierungsflächen 16 auf. Die Form eines im Bereich des zuströmseitigen Ende des Brennstoffeinspritzventil 3 liegenden Kodierabschnitts 19, der in die unteren Federarme 14 eingreift, ist so ausgebildet, daß das Brennstoffeinspritzventil 3 bezüglich eines Drehwinkels oder mehrerer Drehwinkel um die Längsachse des Brennstoffeinspritzventils 3 genau ausgerichtet wird, bzw. nur ausgerichtet eingebaut werden kann. Im weiteren sichern die Positionierungsflächen 16 ein Verdrehen des Brennstoffeinspritzventils 3 um seine Längsachse durch Formschluß. Die Mitte der unteren Federarme 14 weisen vorteilhafterweise eine Kalotte 17 auf, durch die die unteren Federarme 14 in der Mitte von der Aufnahmeöffnung 6 weggebogen sind.The lower spring arms 14 have at their sides facing each other positioning surfaces 16. The shape of a lying in the region of the inflow-side end of the fuel injection valve 3 Kodierabschnitts 19, engages in the lower spring arms 14, is formed so that the fuel injection valve 3 with respect to a rotation angle or more rotational angle about the longitudinal axis of the fuel injection valve 3 is precisely aligned, or can be installed only aligned. Furthermore, the positioning surfaces 16 secure a rotation of the fuel injection valve 3 about its longitudinal axis by positive engagement. The center of the lower spring arms 14 advantageously have a cap 17 through which the lower spring arms 14 are bent away in the middle of the receiving opening 6.

Fig. 2 zeigt eine schematische Darstellung des erfindungsgemäßen Brennstoffeinspritzsystems mit dem Brennstoffeinspritzventil 3. Deutlich sichtbar umgreifen in dieser Figur die unteren Federarme 14 den zuströmseitigen Bereich des Brennstoffeinspritzventils 3. Der Kodierabschnitt 19 ist entsprechend der Form der beiden Positionierungsflächen 16 geformt und liegt an diesen idealerweise passgenau an. Dabei wird das Brennstoffeinspritzventil 3 gegen Verdrehen um seine Längsachse gesichert. Fig. 2 clearly visible surround in this figure, the lower spring arms 14 the inflow-side region of the fuel injection valve 3. The Kodierabschnitt 19 is shaped according to the shape of the two positioning surfaces 16 and is ideally to this exact fit. In this case, the fuel injection valve 3 is secured against rotation about its longitudinal axis.

Im montierten Zustand des erfindungsgemäßen Brennstoffeinspritzsystems, beispielsweise an einem nicht dargestellten Zylinderkopf, ist der untere Abschnitt 12 gegen das Brennstoffeinspritzventil 3 vorgespannt und drückt auf einen am Brennstoffeinspritzventil 3 fest angeordneten Auflagering 18, wobei sich der Niederhalteabschnitt 2 an dem Zuteilungsabschnitt 1 über den oberen Abschnitt 11 abstützt. Der Auflagering 18 und der Kodierabschnitt 19 sind im gezeigten Ausführungsbeispiel einstückig ausgeführt. Beispielsweise zur Schwingungsdämpfung kann zwischen dem oberen Abschnitt 11 und der Unterseite 9 eine nicht dargestellte dauerelastische Zwischenlage angeordnet sein. Der untere Abschnitt 12 wird bei der Montage geringfügig gegen den oberen Abschnitt 11 bewegt, wodurch sich der untere Abschnitt 12 gegen das Brennstoffeinspritzventil 3 elastisch vorspannt. Durch die Kalotten 17, mit der der untere Abschnitt 12 vorzugsweise auf dem Auflagering 18 aufliegt, wird verhindert, daß dabei radial gerichtete Kräfte auf das Brennstoffeinspritzventil 3 einwirken.In the mounted state of the fuel injection system according to the invention, for example, on a cylinder head, not shown, the lower portion 12 is biased against the fuel injection valve 3 and presses on a fuel injection valve 3 fixed support ring 18, wherein the hold-down portion 2 at the allocation section 1 on the upper portion 11th supported. The support ring 18 and the coding section 19 are made in one piece in the embodiment shown. For example, for vibration damping can be arranged between the upper portion 11 and the bottom 9, not shown permanently elastic intermediate layer. The lower portion 12 is slightly moved during assembly against the upper portion 11, whereby the lower portion 12 elastically biases against the fuel injection valve 3. Through the calotte 17, with the lower portion 12 preferably rests on the support ring 18, it is prevented that radially directed forces acting on the fuel injection valve 3.

Fig. 3 zeigt eine mögliche Ausführungsform des Kodierabschnitts 19 des Brennstoffeinspritzventils 3. Der Kodierabschnitt 19 weist zwei tangential zur Längsachse 21 des Brennstoffeinspritzventils 3 und gerade verlaufende Einschnitte 20 auf, die im Ausführungsbeispiel parallel zueinander verlaufen. Der Kodierabschnitt 19 kann einstückig oder getrennt mit dem Brennstoffeinspritzventil 3 ausgeführt sein, beispielsweise als nicht dargestellte Hülse, die beispielsweise aufgepreßt oder mit dem Brennstoffeinspritzventil 3 in gewünschter Lage verschweißt wird. Fig. 3 shows a possible embodiment of the Kodierabschnitts 19 of the fuel injection valve 3. The coding section 19 has two tangential to the longitudinal axis 21 of the fuel injection valve 3 and straight incisions 20 which extend parallel to each other in the embodiment. The coding portion 19 may be integral or separate with the fuel injection valve 3, for example, as a sleeve, not shown, which is for example pressed or welded to the fuel injection valve 3 in the desired position.

Claims (6)

  1. Fuel injection system having at least one fuel injection valve (3), having a metering section (1) which has a connecting section (5) and a line section (4) by means of which fuel is conducted to the fuel injection valve (3), and having a hold-down section (2) for elastically holding down the fuel injection valve (3), with the hold-down section (2) being supported on the metering section (1),
    characterized
    in that the hold-down section (2) is of U-shaped design, with the hold-down section (2) having an upper section (11), which is directed towards the connecting section (5), and a lower section (12) which is situated opposite the upper section (11) and which is further remote from the connecting section (5) than the upper section (11), and with the upper section (11) bifurcating into two upper spring arms (13) which run parallel to one another, and the lower section (12) bifurcating into two lower spring arms (14) which run parallel to one another, and
    in that the metering section (1) has an elevation (10), and a receiving opening (6) for receiving the inflow-side end of the fuel injection valve (3) opens out of the elevation (10), and
    the upper section (11) engages around the elevation (10).
  2. Fuel injection system according to Claim 1,
    characterized
    in that the hold-down section (2) is supported directly on the metering section (1).
  3. Fuel injection system according to Claim 1,
    characterized
    in that the elevation (10) is shaped such that the upper section (11), which engages at least partially radially around the elevation (10), is joined in a positively locking manner to the elevation (10) so as to be prevented from twisting.
  4. Fuel injection system according to Claim 3,
    characterized
    in that the elevation (10) has a lug (15) and/or is at least partially of oval shape.
  5. Fuel injection system according to one of Claims 1 to 4,
    characterized
    in that the lower spring arms (14) have positioning surfaces (16).
  6. Fuel injection system according to Claim 5,
    characterized
    in that the positioning surfaces (16) engage with an accurate fit into a coding section (19) of the fuel injection valve (3), with the coding section (19) and the positioning surfaces (16) determining the rotational angle or the installation position of the fuel injection valve (3) with regard to its orientation about its longitudinal axis (21).
EP20040105650 2003-12-16 2004-11-10 Fuel injector Expired - Fee Related EP1544455B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10358912 2003-12-16
DE2003158912 DE10358912A1 (en) 2003-12-16 2003-12-16 fuel injection system

Publications (3)

Publication Number Publication Date
EP1544455A2 EP1544455A2 (en) 2005-06-22
EP1544455A3 EP1544455A3 (en) 2006-03-15
EP1544455B1 true EP1544455B1 (en) 2011-02-16

Family

ID=34485406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040105650 Expired - Fee Related EP1544455B1 (en) 2003-12-16 2004-11-10 Fuel injector

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EP (1) EP1544455B1 (en)
DE (2) DE10358912A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004048401A1 (en) * 2004-10-01 2006-04-06 Robert Bosch Gmbh Downholder for a fuel injector and fuel injector
DE102010017725B4 (en) 2010-07-05 2018-05-30 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Injection arrangement for an internal combustion engine of a motor vehicle
JP5822272B2 (en) * 2012-02-27 2015-11-24 株式会社ケーヒン Support structure for fuel injection valve
DE102018218711A1 (en) 2018-10-31 2020-04-30 Robert Bosch Gmbh Hold-down device for a fuel injector
JP7339839B2 (en) * 2019-10-07 2023-09-06 Ckd株式会社 solenoid valve

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19735665A1 (en) 1997-06-25 1999-01-07 Bosch Gmbh Robert Fuel injection system
US5970953A (en) * 1999-01-12 1999-10-26 Siemens Automotive Corporation High pressure injector clip
DE10152421A1 (en) * 2001-10-24 2003-06-18 Bosch Gmbh Robert fastening device
DE10163030B4 (en) * 2001-12-20 2014-10-09 Robert Bosch Gmbh fastening device
JP3997946B2 (en) * 2002-07-26 2007-10-24 株式会社デンソー Fuel supply device
DE10256668A1 (en) * 2002-12-04 2004-07-29 Robert Bosch Gmbh support element

Also Published As

Publication number Publication date
DE10358912A1 (en) 2005-09-08
DE502004012192D1 (en) 2011-03-31
EP1544455A3 (en) 2006-03-15
EP1544455A2 (en) 2005-06-22

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