EP2665920B1 - Fuel injection valve with an improved high-pressure connection - Google Patents

Fuel injection valve with an improved high-pressure connection Download PDF

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Publication number
EP2665920B1
EP2665920B1 EP12700662.5A EP12700662A EP2665920B1 EP 2665920 B1 EP2665920 B1 EP 2665920B1 EP 12700662 A EP12700662 A EP 12700662A EP 2665920 B1 EP2665920 B1 EP 2665920B1
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EP
European Patent Office
Prior art keywords
flange element
rail
connector piece
fuel injection
injection device
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.)
Active
Application number
EP12700662.5A
Other languages
German (de)
French (fr)
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EP2665920A1 (en
Inventor
Ralf Kromer
Guenter Wolff
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2665920A1 publication Critical patent/EP2665920A1/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
    • F02M55/004—Joints; Sealings
    • 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
    • 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
    • F02M55/025—Common rails
    • 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

Definitions

  • the present invention relates to a fuel injection valve with an improved high-pressure connection between an injector and a rail.
  • Fuel injection valves are known from the prior art in different configurations.
  • a metal-to-metal connection is increasingly being used between a rail (fuel reservoir) and an injector instead of an O-ring seal in order to reduce HC emissions.
  • these metal-metal connections require relatively high forces with which the surfaces must be pressed against one another in order to ensure sufficient tightness. Often the force required for this is applied to the metal sealing surfaces by means of a union nut which is tightened by screws.
  • a large number of individual components is necessary, in particular several ring segments being used for power transmission. On the one hand, this leads to high manufacturing costs due to the large number of components and, on the other hand, to increased assembly costs. It would therefore be desirable to have a safe and easy-to-install connection between an injector and a rail, even in high-pressure applications.
  • a fuel injection device which comprises a rail with at least one outflow opening, at least one injector which is arranged on the rail, a connection piece arranged on the injector and a flange element for fastening the connection piece to the rail.
  • the flange element has a central opening through which the connecting piece is passed.
  • a metal-to-metal seal is provided between the connector and the rail.
  • the connection piece is formed in one piece with an undercut, the flange element engaging the undercut of the connection piece and pressing the connection piece against the rail in a sealing manner.
  • a fuel supply device which comprises a supply line.
  • Various units such as connecting lines that lead to a high-pressure pump, a pressure relief valve and a pressure sensor or an injector are arranged and attached to the supply line. All fastenings are characterized in the same way in that couplings are applied to the supply line, which surround it and have a coupling socket with an internal thread for the respective connection.
  • the units to be fastened are provided with an external thread in the connection area and are screwed into the coupling sockets of the couplings to form a screw connection until the connection sockets come to a metallic stop on the supply line.
  • sealing elements are inserted in this stop area, as the tightening of the screwed-in assemblies can cause slight misalignments that can lead to leaks in the connection area.
  • a fuel injection device which comprises a rail with at least one discharge opening, at least one injector which is arranged on the rail, a connecting piece arranged on the injector and a flange element for fastening the injector to the rail.
  • the flange element has a central opening through which the connector is passed, a metal-to-metal seal being provided between the connector and the rail, and the connector being made in several parts with an undercut. The flange element engages the undercut of the connection piece and presses the connection piece against the rail in a sealing manner.
  • the one-piece flange element has the central opening into which the connection piece is inserted without a thread, while fastening elements engage in fastening openings of the flange element with a thread.
  • the connection piece must always be installed on the flange element before the fastening elements in the form of screws intervene to tighten the flange element, since otherwise the undercut of the connection piece would not be able to be introduced behind the flange element.
  • the fuel injection device with the features of claims 1 and 5 has the advantage that a metal-to-metal seal is possible which does not allow any leakage even at high pressures in a rail. Furthermore, according to the invention, any angular offset that may exist between the rail and an injector can also be compensated for by a connection piece according to the invention. According to the invention, a flange element is also provided to attach the injector to the rail, the flange element engaging an undercut on the one-piece connection piece and pressing the connection piece against the rail in order to enable a secure metal-to-metal seal. According to the invention, the number of parts can be reduced and assembly can also be made simpler.
  • the metal-to-metal seal is preferably a metallic ball-cone seal, the spherical area preferably being provided on the connection piece and the cone being provided on the rail.
  • the flange element is further preferably designed in two parts with a first and a second part. This enables particularly simple assembly of the flange area on the connection piece.
  • the first part of the flange element is particularly preferably constructed in the same way as the second part of the flange element. This results in particularly cost-effective manufacturability. Furthermore, there is no risk of mixing up the parts during assembly.
  • the two-part flange element is preferably divided at a central opening through which the connecting piece is guided. This enables the flange element to be mounted laterally on the connection piece.
  • the flange element is designed in one piece. As a result, the ease of assembly of the flange element can be increased even further.
  • the one-piece flange element particularly preferably comprises an assembly opening which is connected to the central opening via a continuous connecting slot. This makes it possible for the Connection piece is at least partially passed through the assembly opening of the flange element and is then arranged via the continuous connecting slot in the central opening. This can be done, for example, by tilting the flange element.
  • the assembly opening is particularly preferably arranged at an angle of approximately 45 ° to the central opening.
  • the flange element is formed in one piece and a bayonet-type connection is provided between the flange element and the connecting piece. This enables simple assembly, for example by inserting and then rotating the flange element.
  • the undercut on the connection piece has a partial spherical surface shape and one or more partial spherical surface areas with the same or very similar radius as the radius on the undercut are formed on the flange element. In this way, a very good angle compensation between rail and injector can be made possible in a particularly simple manner.
  • a bevel is provided on the flange element at a central opening of the flange element, which is directed towards the connection piece. This increases a contact area between the flange element and the connection piece.
  • the present invention is preferably used in high pressure injection systems.
  • the fuel injection device 1 comprises a rail 2 with a central storage bore 20 at which a multiplicity of outflow openings 21 exit, with FIG Figure 1 for the sake of clarity, only one outflow opening 21 to the injector is shown. Furthermore, the fuel injection device 1 comprises an injector 3 on which a connection piece 4 with a central through hole 40 is arranged.
  • the connection piece 4 provides a connection between the rail and the injector 3.
  • the connection piece 4 has a spherical surface 41 on the end directed towards the rail 2 and an undercut 42.
  • a conical surface 22 is formed at the outflow opening 21 on the rail 2.
  • the fuel injection device 1 comprises a flange element 5, which is shown in detail in FIGS Figures 2 and 3 is shown.
  • the flange element 5 is designed in two parts and comprises a first flange part 57 and a second flange part 58.
  • the two flange parts 57, 58 are designed identically and are pushed against one another in order to then form the flange element 5.
  • a first fastening opening 51 and a second fastening opening 52 are provided on the flange element 5, each of which is formed by partial openings in the first and second flange part 57, 58.
  • a first partial opening 53 without a thread and a second partial opening 54 with a thread is provided on the first flange part 57.
  • the second flange part 57 is provided with a first partial opening 55 without a thread and a second partial opening 56 with a thread.
  • a sub-area of the fastening openings 51, 52 is thus provided with a thread.
  • fastening elements 6, 7, indicated schematically in the form of screws, are used for the assembly of the flange element 5, which are inserted through through bores 23, 24 provided in the rail 2 are inserted through and screwed into the flange element 5.
  • the spherical surface 41 is pressed against the conical surface 42, as a result of which a metal-to-metal seal 9 is produced between the rail 2 and the connecting piece 4.
  • the necessary contact pressure is applied to the connection piece 4 via the fastening elements 6, 7, the flange element 5 and the undercut 42.
  • a secure metal-to-metal seal 9 between rail 2 and injector 3 can thus be made possible by a two-part flange element 5. Due to the two-part design of the flange element 5, the flange element 5 can easily be attached to the connection piece 4 from the side below the undercut 42, so that the connection piece 4 runs through the central opening 50 in the flange element 5. By screwing in the two fastening elements 6, 7, the flange element 5 is then tightened in the direction of the rail 2 and thus exerts the pretensioning force required for sealing on the connection piece 4.
  • the injector including a final overmolding with a plug can be completed, and the two-part flange element 5 on the injector, more precisely on the connector 4, which is firmly attached to the injector 3, is only joined during final assembly.
  • the flange element 5 can also be attached very easily and quickly.
  • Another advantage is that the risk of damage to the spherical surface 41 and the conical surface 42 due to the assembly below the undercut 42 is significantly reduced. This is a significant advantage compared to the prior art, since the assembly can be done from the side, and even the smallest damage to the spherical surface or the conical surface can lead to leaks due to the extremely high pressures of over 20 MPa.
  • a chamfer (not shown) can also be provided for a larger contact surface between the connection piece 4 and the flange element 5.
  • FIG. 5 to 7 shows a fuel injection device according to a second exemplary embodiment of the invention, identical or functionally identical parts being denoted by the same reference numerals as in the first exemplary embodiment.
  • the flange element 5 is formed in one piece in the second embodiment.
  • the flange element 5 of the second exemplary embodiment has, in addition to the central opening 50, a mounting opening 60, which is also formed as a continuous opening through the flange element 5.
  • the assembly opening 60 is connected to the central opening 50 via a connection slot 61, which is also continuous.
  • An axis of the assembly opening 60 is arranged at an angle of approximately 45 ° to the axis of the central opening 50.
  • connection piece 4 has a relatively long neck section 43. From the in the Figures 5 and 6th The positions shown, the flange element 5 is then pivoted in the direction of the arrow A by approximately 45 °, so that the connecting piece 4 is then arranged in the central opening 5, as in FIG Figure 7 shown.
  • the flange element 5 is then fixed to the rail 3 via the first and second fastening openings 51, 52 with fastening elements (not shown), with a relatively wide, conical bevel 62 against a likewise conical
  • the undercut 42 presses and thus presses the spherical surface 41 again against the conical surface 22, not shown, of the rail 2.
  • the reference number 8 denotes a plug.
  • a tilting back of the flange element 5 or an undesired rotation of the flange element 5 can be prevented, for example, by a plastic clip.
  • the second exemplary embodiment thus has a one-piece flange element 5 with a central opening 50 and a separate assembly opening 60 which is arranged at an angle to the central opening 50.
  • the flange element 5 can be brought into the assembly position for assembly on the rail 2 by a simple pivoting process.
  • a fuel injection device according to a third exemplary embodiment of the invention is described in detail, again identical or functionally identical parts being denoted by the same reference numerals as in the first exemplary embodiment.
  • a bayonet-type connection 70 is provided between the connection piece 4 and the flange element 5.
  • a bayonet element 71 with a first flattened side 72 and a second flattened side 73 is provided on the connection piece 4.
  • the undercut 42 which in the third exemplary embodiment has a spherical surface shape, is also provided on the bayonet element 71.
  • the central opening 50 of the flange element 5 is formed with a contour corresponding to the bayonet element 71, so that the bayonet element 71 can only be inserted into the central opening 50 in one aligned direction.
  • Figure 8 shows the insertion process from below and Figure 10 shows the insertion process from above, where in Figure 10 the connection piece 4 has almost been passed through the flange element 5. If in the in the Figures 9 and 11 The position shown, the flange element 5 can be rotated relative to the connection piece 4, the flange element 5 is rotated by 90 °, so that the undercut 42 is brought into contact with a first and a second bearing surface 74, 75.
  • two fastening elements 6, 7 can be screwed into the fastening openings 51, 52, which are both equipped with a thread, so that the flange element 5 is pressed against the undercut 42 and the connecting piece 4 against a not shown conical surface is pressed on the rail. In this way, a secure metal-to-metal connection can also be realized again.
  • the three exemplary embodiments described thus show a very inexpensive and secure connection between a rail 2 and an injector 3.
  • the flange element 5 can be designed in two parts, as in the first exemplary embodiment, or in one piece, as in the second and third exemplary embodiments. In particular, the number of parts for mounting the injector 3 on the rail 2 can be significantly reduced.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft ein Kraftstoffeinspritzventil mit einem verbesserten Hochdruckanschluss zwischen einem Injektor und einem Rail.The present invention relates to a fuel injection valve with an improved high-pressure connection between an injector and a rail.

Kraftstoffeinspritzventile sind nach dem Stand der Technik in unterschiedlichen Ausgestaltungen bekannt. Bei Hochdruckeinspritzanlagen wird vermehrt zwischen einem Rail (Kraftstoffspeicher) und einem Injektor eine Metall-Metall-Verbindung anstatt einer O-Ring-Abdichtung verwendet, um eine HC-Emission zu reduzieren. Diese Metall-Metall-Verbindungen erfordern jedoch relativ hohe Kräfte, mit denen die Flächen aufeinandergedrückt werden müssen, um eine ausreichende Dichtheit sicherzustellen. Häufig wird die hierzu erforderliche Kraft auf die Metalldichtflächen mittels einer Überwurfmutter, welche durch Schrauben angezogen wird, aufgebracht. Bei der bekannten Lösung ist jedoch eine Vielzahl von einzelnen Bauteilen notwendig, wobei insbesondere mehrere Ringsegmente zur Kraftübertragung verwendet werden. Dies führt einerseits zu hohen Herstellkosten aufgrund der Vielzahl der Bauteile und andererseits zu einem erhöhten Montageaufwand. Er wäre daher wünschenswert, eine sichere und einfach montierbare Verbindung zwischen einem Injektor und einem Rail auch bei Hochdruckanwendungen zu haben.Fuel injection valves are known from the prior art in different configurations. In high-pressure injection systems, a metal-to-metal connection is increasingly being used between a rail (fuel reservoir) and an injector instead of an O-ring seal in order to reduce HC emissions. However, these metal-metal connections require relatively high forces with which the surfaces must be pressed against one another in order to ensure sufficient tightness. Often the force required for this is applied to the metal sealing surfaces by means of a union nut which is tightened by screws. In the known solution, however, a large number of individual components is necessary, in particular several ring segments being used for power transmission. On the one hand, this leads to high manufacturing costs due to the large number of components and, on the other hand, to increased assembly costs. It would therefore be desirable to have a safe and easy-to-install connection between an injector and a rail, even in high-pressure applications.

Offenbarung der ErfindungDisclosure of the invention

Aus der US 2009/0107462 A1 ist bereits eine Kraftstoffeinspritzvorrichtung bekannt, die ein Rail mit wenigstens einer Abströmöffnung, mindestens einen Injektor, welcher am Rail angeordnet ist, ein am Injektor angeordnetes Anschlussstück und ein Flanschelement zur Befestigung des Anschlussstücks am Rail umfasst. Das Flanschelement weist eine Zentralöffnung auf, durch welche das Anschlussstück hindurchgeführt ist. Zwischen dem Anschlussstück und dem Rail ist eine Metall-Metall-Abdichtung vorgesehen. Das Anschlussstück ist einstückig mit einer Hinterschneidung gebildet, wobei das Flanschelement an der Hinterschneidung des Anschlussstücks angreift und das Anschlussstück gegen das Rail in abdichtender Weise drückt.From the US 2009/0107462 A1 a fuel injection device is already known which comprises a rail with at least one outflow opening, at least one injector which is arranged on the rail, a connection piece arranged on the injector and a flange element for fastening the connection piece to the rail. The flange element has a central opening through which the connecting piece is passed. A metal-to-metal seal is provided between the connector and the rail. The connection piece is formed in one piece with an undercut, the flange element engaging the undercut of the connection piece and pressing the connection piece against the rail in a sealing manner.

Aus der EP 0 508 362 A2 ist bereits eine Kraftstoffversorgungsvorrichtung bekannt, die eine Versorgungsleitung umfasst. An der Versorgungsleitung sind verschiedene Aggregate wie Verbindungsleitungen, die zu einer Hochdruckpumpe führen, ein Überdruckventil sowie ein Drucksensor oder ein Injektor angeordnet und befestigt. Alle Befestigungen zeichnen sich in gleicher Weise dadurch aus, dass Kupplungen auf die Versorgungsleitung aufgebracht werden, die diese umschließen und für den jeweiligen Anschluss einen Kupplungsstutzen mit einem Innengewinde aufweisen. Die zu befestigenden Aggregate sind im Anschlussbereich mit einem Außengewinde versehen und werden zu einer Schraubverbindung in die Kupplungsstutzen der Kupplungen geschraubt, bis es zu einem metallischen Anschlag der Anschlussstutzen an der Versorgungsleitung kommt. Zusätzlich werden in diesem Anschlagbereich Dichtelemente eingelegt, da durch das Anziehen der eingeschraubten Aggregate geringfügige Schiefstellungen möglich sind, die zu Undichtheiten im Verbindungsbereich führen können.From the EP 0 508 362 A2 a fuel supply device is already known which comprises a supply line. Various units such as connecting lines that lead to a high-pressure pump, a pressure relief valve and a pressure sensor or an injector are arranged and attached to the supply line. All fastenings are characterized in the same way in that couplings are applied to the supply line, which surround it and have a coupling socket with an internal thread for the respective connection. The units to be fastened are provided with an external thread in the connection area and are screwed into the coupling sockets of the couplings to form a screw connection until the connection sockets come to a metallic stop on the supply line. In addition, sealing elements are inserted in this stop area, as the tightening of the screwed-in assemblies can cause slight misalignments that can lead to leaks in the connection area.

Aus der DE 10 2009 020 867 A1 ist bereits eine Kraftstoffeinspritzvorrichtung bekannt, die ein Rail mit wenigstens einer Abströmöffnung, mindestens einen Injektor, welcher am Rail angeordnet ist, ein am Injektor angeordnetes Anschlussstück und ein Flanschelement zur Befestigung des Injektors am Rail umfasst. Das Flanschelement weist eine Zentralöffnung auf, durch welche das Anschlussstück hindurchgeführt ist, wobei zwischen dem Anschlussstück und dem Rail eine Metall-Metall-Abdichtung vorgesehen ist, und wobei das Anschlussstück mehrteilig mit einer Hinterschneidung ausgeführt ist. Das Flanschelement greift an der Hinterschneidung des Anschlussstücks an und drückt das Anschlussstück gegen das Rail in abdichtender Weise. Das einstückige Flanschelement weist die Zentralöffnung auf, in die das Anschlussstück gewindefrei eingebracht ist, während Befestigungselemente in Befestigungsöffnungen des Flanschelements mit einem Gewinde eingreifen. Die Montage des Anschlussstücks am Flanschelement muss dabei immer erfolgen bevor die Befestigungselemente in Form von Schrauben zum Anziehen des Flanschelements eingreifen, da ansonsten die Hinterschneidung des Anschlussstücks nicht hinter das Flanschelement einbringbar wäre.From the DE 10 2009 020 867 A1 a fuel injection device is already known which comprises a rail with at least one discharge opening, at least one injector which is arranged on the rail, a connecting piece arranged on the injector and a flange element for fastening the injector to the rail. The flange element has a central opening through which the connector is passed, a metal-to-metal seal being provided between the connector and the rail, and the connector being made in several parts with an undercut. The flange element engages the undercut of the connection piece and presses the connection piece against the rail in a sealing manner. The one-piece flange element has the central opening into which the connection piece is inserted without a thread, while fastening elements engage in fastening openings of the flange element with a thread. The connection piece must always be installed on the flange element before the fastening elements in the form of screws intervene to tighten the flange element, since otherwise the undercut of the connection piece would not be able to be introduced behind the flange element.

Die erfindungsgemäße Kraftstoffeinspritzvorrichtung mit den Merkmalen der Ansprüche 1 und 5 weist demgegenüber den Vorteil auf, dass eine Metall-Metall-Abdichtung möglich ist, welche auch bei hohen Drücken in einem Rail keine Undichtigkeit zulässt. Ferner kann erfindungsgemäß auch ein gegebenenfalls zwischen dem Rail und einem Injektor vorhandener Winkelversatz durch ein erfindungsgemäßes Anschlussstück ausgeglichen werden. Erfindungsgemäß ist ferner ein Flanschelement vorgesehen, um den Injektor am Rail zu befestigen, wobei das Flanschelement an einer Hinterschneidung an dem einstückigen Anschlussstück angreift und das Anschlussstück gegen das Rail drückt, um eine sichere Metall-Metall-Abdichtung zu ermöglichen. Dabei kann erfindungsgemäß die Teileanzahl reduziert werden und ferner eine Montage einfacher gestaltet werden.The fuel injection device according to the invention with the features of claims 1 and 5 has the advantage that a metal-to-metal seal is possible which does not allow any leakage even at high pressures in a rail. Furthermore, according to the invention, any angular offset that may exist between the rail and an injector can also be compensated for by a connection piece according to the invention. According to the invention, a flange element is also provided to attach the injector to the rail, the flange element engaging an undercut on the one-piece connection piece and pressing the connection piece against the rail in order to enable a secure metal-to-metal seal. According to the invention, the number of parts can be reduced and assembly can also be made simpler.

Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The subclaims show preferred developments of the invention.

Die Metall-Metall-Abdichtung ist vorzugsweise eine metallische Kugel-Konus-Abdichtung, wobei vorzugsweise der Kugelbereich am Anschlussstück und der Konus am Rail vorgesehen ist.The metal-to-metal seal is preferably a metallic ball-cone seal, the spherical area preferably being provided on the connection piece and the cone being provided on the rail.

Weiter bevorzugt ist das Flanschelement zweiteilig mit einem ersten und einem zweiten Teil ausgebildet. Hierdurch kann eine besonders einfache Montage des Flanschbereichs am Anschlussstück ermöglicht werden.The flange element is further preferably designed in two parts with a first and a second part. This enables particularly simple assembly of the flange area on the connection piece.

Besonders bevorzugt ist dabei der erste Teil des Flanschelements gleich wie der zweite Teil des Flanschelements aufgebaut. Hierdurch ergibt sich eine besonders kostengünstige Herstellbarkeit. Ferner wird auch eine Verwechslungsgefahr der Teile bei der Montage ausgeschlossen.The first part of the flange element is particularly preferably constructed in the same way as the second part of the flange element. This results in particularly cost-effective manufacturability. Furthermore, there is no risk of mixing up the parts during assembly.

Vorzugsweise ist das zweiteilige Flanschelement an einer Zentralöffnung, durch welche das Anschlussstück geführt ist, geteilt. Hierdurch wird eine seitliche Montage des Flanschelements am Anschlussstück ermöglicht.The two-part flange element is preferably divided at a central opening through which the connecting piece is guided. This enables the flange element to be mounted laterally on the connection piece.

Erfindungsgemäß ist das Flanschelement einstückig ausgebildet. Hierdurch kann eine Montagefreundlichkeit des Flanschelements noch weiter gesteigert werden.According to the invention, the flange element is designed in one piece. As a result, the ease of assembly of the flange element can be increased even further.

Besonders bevorzugt umfasst das einstückige Flanschelement eine Montageöffnung, welche über einen durchgehenden Verbindungsschlitz mit der Zentralöffnung verbunden ist. Hierdurch wird es möglich, dass das Anschlussstück durch die Montageöffnung des Flanschelements zumindest teilweise hindurchgeführt wird und dann über den durchgehenden Verbindungsschlitz in der Zentralöffnung angeordnet ist. Dies kann beispielsweise durch ein Kippen des Flanschelements erfolgen. Besonders bevorzugt ist dabei die Montageöffnung in einem Winkel von ca. 45° zur Zentralöffnung angeordnet.The one-piece flange element particularly preferably comprises an assembly opening which is connected to the central opening via a continuous connecting slot. This makes it possible for the Connection piece is at least partially passed through the assembly opening of the flange element and is then arranged via the continuous connecting slot in the central opening. This can be done, for example, by tilting the flange element. The assembly opening is particularly preferably arranged at an angle of approximately 45 ° to the central opening.

Gemäß einer weiteren alternativen Ausgestaltung der vorliegenden Erfindung ist das Flanschelement einstückig ausgebildet und zwischen dem Flanschelement und dem Anschlussstück ist eine bajonettverschlussartige Verbindung vorgesehen. Hierdurch kann eine einfache Montage, beispielsweise durch Einführen und anschließendes Drehen des Flanschelements, erfolgen.According to a further alternative embodiment of the present invention, the flange element is formed in one piece and a bayonet-type connection is provided between the flange element and the connecting piece. This enables simple assembly, for example by inserting and then rotating the flange element.

Besonders bevorzugt weist die Hinterschneidung am Anschlussstück eine Teilkugelflächenform auf und am Flanschelement sind ein oder mehrere Teilkugelflächenbereiche mit gleichem oder sehr ähnlichem Radius wie dem Radius an der Hinterschneidung gebildet. Hierdurch kann auf besonders einfache Weise ein sehr guter Winkelausgleich zwischen Rail und Injektor ermöglicht werden.Particularly preferably, the undercut on the connection piece has a partial spherical surface shape and one or more partial spherical surface areas with the same or very similar radius as the radius on the undercut are formed on the flange element. In this way, a very good angle compensation between rail and injector can be made possible in a particularly simple manner.

Weiter bevorzugt ist am Flanschelement eine Fase an einer Zentralöffnung des Flanschelements vorgesehen, welche zum Anschlussstück gerichtet ist. Hierdurch wird eine Kontaktfläche zwischen Flanschelement und Anschlussstück vergrößert.More preferably, a bevel is provided on the flange element at a central opening of the flange element, which is directed towards the connection piece. This increases a contact area between the flange element and the connection piece.

Die vorliegende Erfindung wird vorzugsweise bei Hochdruck-Einspritzsystemen verwendet.The present invention is preferably used in high pressure injection systems.

Zeichnungdrawing

Nachfolgend werden bevorzugte Ausführungsbeispiele der Erfindung unter Bezugnahme auf die begleitende Zeichnung im Detail beschrieben. In der Zeichnung ist:

Figur 1
eine schematische Schnittansicht einer Kraftstoffeinspritzvorrichtung gemäß einem ersten Ausführungsbeispiel der vorliegenden Erfindung,
Figur 2
eine schematische, perspektivische Ansicht eines Flanschelements von Figur 1 im zusammengebauten Zustand,
Figur 3
eine schematische, perspektivische Ansicht der Einzelteile des Flanschelements,
Figur 4
eine schematische, perspektivische Ansicht des Anschlussstücks zwischen Rail und Injektor,
Figur 5
eine schematische, perspektivische Ansicht einer Kraftstoffeinspritzvorrichtung mit einem Flanschelement gemäß einem zweiten Ausführungsbeispiel der Erfindung,
Figur 6
eine schematische, perspektivische Ansicht des Flanschelements von Figur 5 aus einer anderen Perspektive,
Figur 7
eine schematische, perspektivische Ansicht des Flanschelements von Figur 5 im montierten Zustand,
Figur 8
eine schematische, perspektivische Ansicht einer Kraftstoffeinspritzvorrichtung mit einem Flanschelement gemäß einem dritten Ausführungsbeispiel der Erfindung,
Figur 9
eine schematische Schnittansicht des Flanschelements von Figur 8,
Figur 10
eine schematische, perspektivische Ansicht des Montagevorgangs des Flanschelements von Figur 8, und
Figur 11
eine schematische, perspektivische Ansicht des montierten Flanschelements von Figur 10.
Preferred exemplary embodiments of the invention are described in detail below with reference to the accompanying drawings. In the drawing is:
Figure 1
a schematic sectional view of a fuel injection device according to a first embodiment of the present invention,
Figure 2
a schematic, perspective view of a flange element of FIG Figure 1 in the assembled state,
Figure 3
a schematic, perspective view of the individual parts of the flange element,
Figure 4
a schematic, perspective view of the connection piece between rail and injector,
Figure 5
a schematic, perspective view of a fuel injection device with a flange element according to a second embodiment of the invention,
Figure 6
a schematic, perspective view of the flange element of FIG Figure 5 from a different perspective,
Figure 7
a schematic, perspective view of the flange element of FIG Figure 5 in the assembled state,
Figure 8
a schematic, perspective view of a fuel injection device with a flange element according to a third embodiment of the invention,
Figure 9
a schematic sectional view of the flange element of FIG Figure 8 ,
Figure 10
a schematic, perspective view of the assembly process of the flange element of FIG Figure 8 , and
Figure 11
a schematic, perspective view of the assembled flange element of FIG Figure 10 .

Bevorzugte Ausführungsformen der ErfindungPreferred embodiments of the invention

Nachfolgend wird unter Bezugnahme auf die Figuren 1 bis 4 eine Kraftstoffeinspritzvorrichtung 1 gemäß einem ersten bevorzugten Ausführungsbeispiel der Erfindung im Detail beschrieben.In the following, with reference to the Figures 1 to 4 a fuel injection device 1 according to a first preferred embodiment of the invention described in detail.

Wie aus Figur 1 ersichtlich ist, umfasst die Kraftstoffeinspritzvorrichtung 1 ein Rail 2 mit einer zentralen Speicherbohrung 20, an welcher eine Vielzahl von Abströmöffnungen 21 abgehen, wobei in Figur 1 zur Übersichtlichkeit nur eine Abströmöffnung 21 zum Injektor dargestellt ist. Ferner umfasst die Kraftstoffeinspritzvorrichtung 1 einen Injektor 3, an welchem ein Anschlussstück 4 mit einer zentralen Durchgangsbohrung 40 angeordnet ist. Das Anschlussstück 4 stellt eine Verbindung zwischen dem Rail und dem Injektor 3 bereit. Das Anschlussstück 4 weist eine Kugelfläche 41 an dem zum Rail 2 gerichteten Ende sowie eine Hinterschneidung 42 auf. Am Rail 2 ist eine konische Fläche 22 an der Abströmöffnung 21 ausgebildet.How out Figure 1 As can be seen, the fuel injection device 1 comprises a rail 2 with a central storage bore 20 at which a multiplicity of outflow openings 21 exit, with FIG Figure 1 for the sake of clarity, only one outflow opening 21 to the injector is shown. Furthermore, the fuel injection device 1 comprises an injector 3 on which a connection piece 4 with a central through hole 40 is arranged. The connection piece 4 provides a connection between the rail and the injector 3. The connection piece 4 has a spherical surface 41 on the end directed towards the rail 2 and an undercut 42. A conical surface 22 is formed at the outflow opening 21 on the rail 2.

Ferner umfasst die erfindungsgemäße Kraftstoffeinspritzvorrichtung 1 ein Flanschelement 5, welches im Detail in den Figuren 2 und 3 gezeigt ist. Das Flanschelement 5 ist zweiteilig ausgebildet und umfasst ein erstes Flanschteil 57 und ein zweites Flanschteil 58. Die beiden Flanschteile 57, 58 sind dabei gleich ausgebildet und werden gegeneinander geschoben, um dann das Flanschelement 5 zu bilden. Am Flanschelement 5 ist eine erste Befestigungsöffnung 51 und eine zweite Befestigungsöffnung 52 vorgesehen, welche jeweils durch Teilöffnungen im ersten und zweiten Flanschteil 57, 58 gebildet sind. Wie insbesondere in Figur 3 gezeigt, ist am ersten Flanschteil 57 eine erste Teilöffnung 53 ohne Gewinde und eine zweite Teilöffnung 54 mit Gewinde vorgesehen. In gleicher Weise ist das zweite Flanschteil 57 mit einer ersten Teilöffnung 55 ohne Gewinde und einer zweiten Teilöffnung 56 mit Gewinde vorgesehen. Im zusammengebauten Zustand des Flanschelements ist somit jeweils ein Teilbereich der Befestigungsöffnungen 51, 52 mit einem Gewinde versehen.Furthermore, the fuel injection device 1 according to the invention comprises a flange element 5, which is shown in detail in FIGS Figures 2 and 3 is shown. The flange element 5 is designed in two parts and comprises a first flange part 57 and a second flange part 58. The two flange parts 57, 58 are designed identically and are pushed against one another in order to then form the flange element 5. A first fastening opening 51 and a second fastening opening 52 are provided on the flange element 5, each of which is formed by partial openings in the first and second flange part 57, 58. As in particular in Figure 3 As shown, a first partial opening 53 without a thread and a second partial opening 54 with a thread is provided on the first flange part 57. In the same way, the second flange part 57 is provided with a first partial opening 55 without a thread and a second partial opening 56 with a thread. In the assembled state of the flange element, a sub-area of the fastening openings 51, 52 is thus provided with a thread.

Wie aus Figur 1 ersichtlich ist, werden zur Montage des Flanschelements 5 noch schematisch angedeutete Befestigungselemente 6, 7 in Form von Schrauben verwendet, welche durch im Rail 2 vorgesehene Durchgangsbohrungen 23, 24 hindurchgesteckt werden und in das Flanschelement 5 eingeschraubt werden. Dadurch ergibt sich eine axiale Vorspannkraft auf das Anschlussstück 4. Hierdurch wird die Kugelfläche 41 gegen die Konusfläche 42 gedrückt, wodurch eine Metall-Metall-Abdichtung 9 zwischen dem Rail 2 und dem Anschlussstück 4 hergestellt wird. Die notwendige Anpresskraft wird dabei über die Befestigungselemente 6, 7, das Flanschelement 5 und die Hinterschneidung 42 am Anschlussstück 4 aufgebracht.How out Figure 1 As can be seen, fastening elements 6, 7, indicated schematically in the form of screws, are used for the assembly of the flange element 5, which are inserted through through bores 23, 24 provided in the rail 2 are inserted through and screwed into the flange element 5. This results in an axial pretensioning force on the connecting piece 4. As a result, the spherical surface 41 is pressed against the conical surface 42, as a result of which a metal-to-metal seal 9 is produced between the rail 2 and the connecting piece 4. The necessary contact pressure is applied to the connection piece 4 via the fastening elements 6, 7, the flange element 5 and the undercut 42.

Somit kann durch ein zweiteiliges Flanschelement 5 eine sichere Metall-Metall-Abdichtung 9 zwischen Rail 2 und Injektor 3 ermöglicht werden. Durch die zweiteilige Ausgestaltung des Flanschelements 5 kann das Flanschelement 5 einfach von der Seite unterhalb der Hinterschneidung 42 am Anschlussstück 4 angebracht werden, so dass das Anschlussstück 4 durch die Zentralöffnung 50 im Flanschelement 5 verläuft. Durch Einschrauben der beiden Befestigungselemente 6, 7 wird dann das Flanschelement 5 in Richtung zum Rail 2 angezogen und übt somit die für die Abdichtung notwendige Vorspannkraft auf das Anschlussstück 4 aus.A secure metal-to-metal seal 9 between rail 2 and injector 3 can thus be made possible by a two-part flange element 5. Due to the two-part design of the flange element 5, the flange element 5 can easily be attached to the connection piece 4 from the side below the undercut 42, so that the connection piece 4 runs through the central opening 50 in the flange element 5. By screwing in the two fastening elements 6, 7, the flange element 5 is then tightened in the direction of the rail 2 and thus exerts the pretensioning force required for sealing on the connection piece 4.

Somit kann erfindungsgemäß der Injektor einschließlich einer finalen Umspritzung mit einem Stecker (nicht gezeigt) fertiggestellt werden, und erst bei der Endmontage wird das zweiteilige Flanschelement 5 am Injektor, genauer am Anschlussstück 4, welches fest am Injektor 3 befestigt ist, zusammengefügt. Neben der Teilereduktion kann das Flanschelement 5 dabei auch sehr einfach und schnell angebracht werden. Ein weiterer Vorteil liegt darin, dass eine Beschädigungsgefahr der Kugelfläche 41 und der Konusfläche 42 durch die Montage unterhalb der Hinterschneidung 42 deutlich reduziert wird. Dies ist ein bedeutender Vorteil im Vergleich mit dem Stand der Technik, da die Montage seitlich erfolgen kann, und schon kleinste Beschädigungen an der Kugeloberfläche oder an der Konusfläche zu Undichtigkeiten aufgrund der extrem hohen Drücke von über 20 MPa führen können.Thus, according to the invention, the injector including a final overmolding with a plug (not shown) can be completed, and the two-part flange element 5 on the injector, more precisely on the connector 4, which is firmly attached to the injector 3, is only joined during final assembly. In addition to the reduction in parts, the flange element 5 can also be attached very easily and quickly. Another advantage is that the risk of damage to the spherical surface 41 and the conical surface 42 due to the assembly below the undercut 42 is significantly reduced. This is a significant advantage compared to the prior art, since the assembly can be done from the side, and even the smallest damage to the spherical surface or the conical surface can lead to leaks due to the extremely high pressures of over 20 MPa.

Es sei angemerkt, dass an der zum Rail 2 gerichteten Seite der Zentralöffnung 50 auch eine nicht gezeigte Fase für eine größere Auflagefläche zwischen Anschlussstück 4 und Flanschelement 5 vorgesehen sein kann.It should be noted that on the side of the central opening 50 facing the rail 2, a chamfer (not shown) can also be provided for a larger contact surface between the connection piece 4 and the flange element 5.

In den Figuren 5 bis 7 ist eine Kraftstoffeinspritzvorrichtung gemäß einem zweiten Ausführungsbeispiel der Erfindung dargestellt, wobei gleiche bzw. funktional gleiche Teile mit den gleichen Bezugszeichen, wie im ersten Ausführungsbeispiel bezeichnet sind. Im Unterschied zum ersten Ausführungsbeispiel ist beim zweiten Ausführungsbeispiel das Flanschelement 5 einstückig gebildet. Ferner weist das Flanschelement 5 des zweiten Ausführungsbeispiels neben der Zentralöffnung 50 eine Montageöffnung 60 auf, die ebenfalls als durchgehende Öffnung durch das Flanschelement 5 gebildet ist. Die Montageöffnung 60 ist über einen Verbindungsschlitz 61, der ebenfalls durchgehend ausgebildet ist, mit der Zentralöffnung 50 verbunden. Eine Achse der Montageöffnung 60 ist dabei in einem Winkel von ca. 45° zur Achse der Zentralöffnung 50 angeordnet. Hierdurch ist es möglich, dass das Flanschelement 5 in einem ersten Schritt über die Montageöffnung 60 über das vom Injektor 3 vorstehende Anschlussstück 4 geschoben wird, wie dies in den Figuren 5 und 6 dargestellt ist. Dabei weist das Anschlussstück 4 einen relativ langen Halsabschnitt 43 auf. Aus den in den Figuren 5 und 6 gezeigten Positionen wird das Flanschelement 5 dann in Richtung des Pfeils A um ca. 45° geschwenkt, so dass das Anschlussstück 4 dann in der Zentralöffnung 5 angeordnet ist, wie in Figur 7 gezeigt. Anschließend wird zur Montage des Injektors 3 am Rail 2, wie im ersten Ausführungsbeispiel, das Flanschelement 5 über die erste und zweite Befestigungsöffnung 51, 52 mit nicht gezeigten Befestigungselementen am Rail 3 fixiert, wobei eine relativ breite, konische Fase 62 gegen eine ebenfalls konisch gebildete Hinterschneidung 42 drückt und somit die Kugelfläche 41 wieder gegen die nicht gezeigte Konusfläche 22 des Rails 2 drückt. In Figur 7 ist mit dem Bezugszeichen 8 noch ein Stecker bezeichnet.In the Figures 5 to 7 shows a fuel injection device according to a second exemplary embodiment of the invention, identical or functionally identical parts being denoted by the same reference numerals as in the first exemplary embodiment. In contrast to the first embodiment, the flange element 5 is formed in one piece in the second embodiment. Furthermore, the flange element 5 of the second exemplary embodiment has, in addition to the central opening 50, a mounting opening 60, which is also formed as a continuous opening through the flange element 5. The assembly opening 60 is connected to the central opening 50 via a connection slot 61, which is also continuous. An axis of the assembly opening 60 is arranged at an angle of approximately 45 ° to the axis of the central opening 50. This makes it possible for the flange element 5 to be pushed in a first step over the assembly opening 60 over the connecting piece 4 protruding from the injector 3, as shown in FIG Figures 5 and 6th is shown. The connection piece 4 has a relatively long neck section 43. From the in the Figures 5 and 6th The positions shown, the flange element 5 is then pivoted in the direction of the arrow A by approximately 45 °, so that the connecting piece 4 is then arranged in the central opening 5, as in FIG Figure 7 shown. To mount the injector 3 on the rail 2, as in the first exemplary embodiment, the flange element 5 is then fixed to the rail 3 via the first and second fastening openings 51, 52 with fastening elements (not shown), with a relatively wide, conical bevel 62 against a likewise conical The undercut 42 presses and thus presses the spherical surface 41 again against the conical surface 22, not shown, of the rail 2. In Figure 7 the reference number 8 denotes a plug.

Es sei angemerkt, dass ein Zurückkippen des Flanschelements 5 oder ein unerwünschtes Verdrehen des Flanschelements 5 beispielsweise durch einen Kunststoffclip verhindert werden kann.It should be noted that a tilting back of the flange element 5 or an undesired rotation of the flange element 5 can be prevented, for example, by a plastic clip.

Somit weist das zweite Ausführungsbeispiel ein einstückiges Flanschelement 5 mit einer Zentralöffnung 50 und einer separaten Montageöffnung 60 auf, welche im Winkel zur Zentralöffnung 50 angeordnet ist. Durch einen einfachen Verschwenkvorgang kann dabei das Flanschelement 5 in die Montageposition zur Montage an das Rail 2 gebracht werden.The second exemplary embodiment thus has a one-piece flange element 5 with a central opening 50 and a separate assembly opening 60 which is arranged at an angle to the central opening 50. The flange element 5 can be brought into the assembly position for assembly on the rail 2 by a simple pivoting process.

In den Figuren 8 bis 11 ist eine Kraftstoffeinspritzvorrichtung gemäß einem dritten Ausführungsbeispiel der Erfindung im Detail beschrieben, wobei wiederum gleiche bzw. funktional gleiche Teile mit den gleichen Bezugszeichen wie im ersten Ausführungsbeispiel bezeichnet sind. Im Unterschied zum zweiten Ausführungsbeispiel ist bei der Kraftstoffeinspritzvorrichtung des dritten Ausführungsbeispiels eine bajonettverschlussartige Verbindung 70 zwischen dem Anschlussstück 4 und dem Flanschelement 5 vorgesehen. Hierzu ist am Anschlussstück 4 ein Bajonettelement 71 mit einer ersten abgeflachten Seite 72 und einer zweiten abgeflachten Seite 73 vorgesehen. Am Bajonettelement 71 ist ferner auch die Hinterschneidung 42 vorgesehen, welche im dritten Ausführungsbeispiel eine Kugelflächenform hat. Wie insbesondere aus Figur 8 ersichtlich ist, ist die Zentralöffnung 50 des Flanschelements 5 mit einer dem Bajonettelement 71 entsprechenden Kontur gebildet, so dass das Bajonettelement 71 nur in einer ausgerichteten Richtung in die Zentralöffnung 50 eingeführt werden kann. Figur 8 zeigt dabei den Einführvorgang von unten und Figur 10 zeigt den Einführvorgang von oben, wobei in Figur 10 das Anschlussstück 4 schon fast durch das Flanschelement 5 hindurchgeführt wurde. Wenn in der in den Figuren 9 und 11 gezeigten Position das Flanschelement 5 gegenüber dem Anschlussstück 4 gedreht werden kann, wird das Flanschelement 5 um 90° gedreht, so dass die Hinterschneidung 42 mit einer ersten und einer zweiten Auflagefläche 74, 75 in Kontakt gebracht wird. Dann können, wie in den vorigen Ausführungsbeispielen, zwei Befestigungselemente 6, 7 in die Befestigungsöffnungen 51, 52, welche beide mit einem Gewinde ausgestattet sind, eingeschraubt werden, so dass das Flanschelement 5 gegen die Hinterschneidung 42 gedrückt wird und dadurch das Anschlussstück 4 gegen eine nicht dargestellte Konusfläche am Rail gedrückt wird. Hierdurch kann ebenfalls wieder eine sichere Metall-Metall-Verbindung realisiert werden.In the Figures 8 to 11 a fuel injection device according to a third exemplary embodiment of the invention is described in detail, again identical or functionally identical parts being denoted by the same reference numerals as in the first exemplary embodiment. In contrast to the second exemplary embodiment, in the case of the fuel injection device of the third exemplary embodiment, a bayonet-type connection 70 is provided between the connection piece 4 and the flange element 5. For this purpose, a bayonet element 71 with a first flattened side 72 and a second flattened side 73 is provided on the connection piece 4. The undercut 42, which in the third exemplary embodiment has a spherical surface shape, is also provided on the bayonet element 71. Like in particular from Figure 8 As can be seen, the central opening 50 of the flange element 5 is formed with a contour corresponding to the bayonet element 71, so that the bayonet element 71 can only be inserted into the central opening 50 in one aligned direction. Figure 8 shows the insertion process from below and Figure 10 shows the insertion process from above, where in Figure 10 the connection piece 4 has almost been passed through the flange element 5. If in the in the Figures 9 and 11 The position shown, the flange element 5 can be rotated relative to the connection piece 4, the flange element 5 is rotated by 90 °, so that the undercut 42 is brought into contact with a first and a second bearing surface 74, 75. Then, as in the previous exemplary embodiments, two fastening elements 6, 7 can be screwed into the fastening openings 51, 52, which are both equipped with a thread, so that the flange element 5 is pressed against the undercut 42 and the connecting piece 4 against a not shown conical surface is pressed on the rail. In this way, a secure metal-to-metal connection can also be realized again.

Somit zeigen die drei beschriebenen Ausführungsbeispiele eine sehr kostengünstige und sichere Verbindung zwischen einem Rail 2 und einem Injektor 3. Das Flanschelement 5 kann dabei wie im ersten Ausführungsbeispiel zweiteilig oder wie im zweiten und dritten Ausführungsbeispiel einstückig ausgebildet sein. Insbesondere kann dabei die Teileanzahl zur Montage des Injektors 3 am Rail 2 signifikant reduziert werden.The three exemplary embodiments described thus show a very inexpensive and secure connection between a rail 2 and an injector 3. The flange element 5 can be designed in two parts, as in the first exemplary embodiment, or in one piece, as in the second and third exemplary embodiments. In particular, the number of parts for mounting the injector 3 on the rail 2 can be significantly reduced.

Claims (10)

  1. Fuel injection device, comprising
    - a rail (2) with at least one outflow opening (21),
    - at least one injector (3) which is arranged on the rail (2),
    - a connector piece (4) which is arranged on the injector (3), and
    - a flange element (5) for the fastening of the injector (3) to the rail (2),
    - wherein the flange element (5) has a central opening (50) through which the connector piece (4) is led,
    - wherein a metal-on-metal seal (9) is provided between the connector piece (4) and the rail (2),
    - wherein the connector piece (4) is integrally formed with an undercut (42),
    - wherein the flange element (5) engages on the undercut (42) of the connector piece (4) and presses the connector piece (4) against the rail (2) in a sealing manner, wherein the flange element (5) has a central opening (50) into which the connector piece (4) is introduced in a thread-free manner, while fastening elements (6, 7) engage into fastening openings (51, 52) of the flange element (5) with a thread, and
    - wherein the flange element (5) is formed in one piece, characterized
    in that the flange element (5) has an installation opening (60) which is connected via a through-extending connecting slot (61) to the central opening (50).
  2. Fuel injection device according to Claim 1, characterized in that the metal-on-metal seal (9) between the connector piece (4) and the rail (2) is realized by means of a sphere-cone geometry.
  3. Fuel injection device according to Claim 2, characterized in that a sphere surface (41) is formed on the connector piece (4) and a cone surface (22) is formed on the rail (2).
  4. Fuel injection device according to any of Claims 1 to 3, characterized in that the installation opening (60) is arranged at an angle of approximately 45° with respect to the central opening (50).
  5. Fuel injection device, comprising
    - a rail (2) with at least one outflow opening (21),
    - at least one injector (3) which is arranged on the rail (2),
    - a connector piece (4) which is arranged on the injector (3), and
    - a flange element (5) for the fastening of the injector (3) to the rail (2),
    - wherein the flange element (5) has a central opening (50) through which the connector piece (4) is led,
    - wherein a metal-on-metal seal (9) is provided between the connector piece (4) and the rail (2),
    - wherein the connector piece (4) is integrally formed with an undercut (42),
    - wherein the flange element (5) engages on the undercut (42) of the connector piece (4) and presses the connector piece (4) against the rail (2) in a sealing manner,
    - wherein the flange element (5) has a central opening (50) into which the connector piece (4) is introduced in a thread-free manner, while fastening elements (6, 7) engage into fastening openings (51, 52) of the flange element (5) with a thread, and
    - wherein the flange element (5) is formed in one piece, characterized
    in that a bayonet-fastener-like connection (70) is provided between the flange element (5) and the connector piece (4).
  6. Fuel injection device according to Claim 5, characterized in that the metal-on-metal seal (9) between the connector piece (4) and the rail (2) is realized by means of a sphere-cone geometry.
  7. Fuel injection device according to Claim 6, characterized in that a sphere surface (41) is formed on the connector piece (4) and a cone surface (22) is formed on the rail (2).
  8. Fuel injection device according to any of Claims 5 to 7, characterized in that a bayonet element (70) with a first and a second flattened side (72, 73) is arranged on the connector piece (4).
  9. Fuel injection device according to Claim 8, characterized in that a first and a second bearing surface (74, 75) for the undercut (42) of the connector piece (4) are formed on the flange element (5).
  10. Fuel injection device according to any of the preceding claims, characterized by a bevel (62) on the flange element (5).
EP12700662.5A 2011-01-21 2012-01-17 Fuel injection valve with an improved high-pressure connection Active EP2665920B1 (en)

Applications Claiming Priority (2)

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DE102011002996A DE102011002996A1 (en) 2011-01-21 2011-01-21 Fuel injector with improved high pressure connection
PCT/EP2012/050591 WO2012098087A1 (en) 2011-01-21 2012-01-17 Fuel injection valve with an improved high-pressure connection

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EP2665920B1 true EP2665920B1 (en) 2020-09-30

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US (1) US10954906B2 (en)
EP (1) EP2665920B1 (en)
JP (1) JP5774127B2 (en)
CN (1) CN103328809B (en)
BR (1) BR112013017608B1 (en)
DE (1) DE102011002996A1 (en)
WO (1) WO2012098087A1 (en)

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US9228551B2 (en) * 2012-09-13 2016-01-05 Caterpillar Inc. Quill tube protection feature
DE102015210795B4 (en) * 2015-06-12 2024-01-04 Vitesco Technologies GmbH High pressure fuel pump
JP6734179B2 (en) 2016-10-31 2020-08-05 三桜工業株式会社 Fuel piping
DE102017221203A1 (en) * 2017-11-27 2019-05-29 Hyundai Motor Company A fuel injection system and method of operating a fuel injection system
DE102019207390B4 (en) 2019-05-21 2022-03-17 Audi Ag Cylinder head for an internal combustion engine with a fuel rail and an injector, method of assembly and use therefor
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JP2014502697A (en) 2014-02-03
CN103328809A (en) 2013-09-25
US10954906B2 (en) 2021-03-23
BR112013017608A2 (en) 2016-10-18
US20130333669A1 (en) 2013-12-19
WO2012098087A1 (en) 2012-07-26
EP2665920A1 (en) 2013-11-27
DE102011002996A1 (en) 2012-07-26
JP5774127B2 (en) 2015-09-02
BR112013017608B1 (en) 2021-07-20
CN103328809B (en) 2018-05-15

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