EP2665920B1 - Injecteur de carburant doté d'un raccord haute pression amélioré - Google Patents

Injecteur de carburant doté d'un raccord haute pression amélioré 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
Authority
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)
English (en)
Other versions
EP2665920A1 (fr
Inventor
Ralf Kromer
Guenter Wolff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2665920A1 publication Critical patent/EP2665920A1/fr
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Publication of EP2665920B1 publication Critical patent/EP2665920B1/fr
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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.

Claims (10)

  1. Dispositif d'injection de carburant, comprenant :
    - un rail (2) comprenant au moins une ouverture de sortie (21),
    - au moins un injecteur (3) qui est disposé sur le rail (2),
    - un raccord (4) disposé sur l'injecteur (3), et
    - un élément de bride (5) pour la fixation de l'injecteur (3) sur le rail (2),
    - l'élément de bride (5) présentant une ouverture centrale (50) à travers laquelle est guidé le raccord (4),
    - un joint d'étanchéité métal-métal (9) étant prévu entre le raccord (4) et le rail (2),
    - le raccord (4) étant formé d'une seule pièce avec une contre-dépouille (42),
    - l'élément de bride (5) s'engageant sur la contre-dépouille (42) du raccord (4) et le raccord (4) pressant contre le rail (2) de manière hermétique,
    - l'élément de bride (5) présentant une ouverture centrale (50) dans laquelle le raccord (4) est introduit sans filetage tandis que des éléments de fixation (6, 7) viennent en prise avec un filetage dans des ouvertures de fixation (51, 52) de l'élément de bride (5), et
    - l'élément de bride (5) étant réalisé d'une seule pièce,
    caractérisé en ce que
    l'élément de bride (5) présente une ouverture de montage (60) qui est connectée à l'ouverture centrale (50) par le biais d'une fente de liaison continue (61).
  2. Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que le joint d'étanchéité métal-métal (9) entre le raccord (4) et le rail (2) est réalisé par une géométrie sphérique-conique.
  3. Dispositif d'injection de carburant selon la revendication 2, caractérisé en ce qu'une surface sphérique (41) est formée sur le raccord (4) et une surface conique (22) est formée sur le rail (2) .
  4. Dispositif d'injection de carburant selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'ouverture de montage (60) est disposée suivant un angle d'environ 45° par rapport à l'ouverture centrale (50).
  5. Dispositif d'injection de carburant, comprenant
    - un rail (2) comprenant au moins une ouverture de sortie (21),
    - au moins un injecteur (3) qui est disposé sur le rail (2),
    - un raccord (4) disposé sur l'injecteur (3), et
    - un élément de bride (5) pour la fixation de l'injecteur (3) sur le rail (2),
    - l'élément de bride (5) présentant une ouverture centrale (50) à travers laquelle est guidé le raccord (4),
    - un joint d'étanchéité métal-métal (9) étant prévu entre le raccord (4) et le rail (2),
    - le raccord (4) étant formé d'une seule pièce avec une contre-dépouille (42),
    - l'élément de bride (5) s'engageant sur la contre-dépouille (42) du raccord (4) et le raccord (4) pressant contre le rail (2) de manière hermétique,
    - l'élément de bride (5) présentant une ouverture centrale (50) dans laquelle le raccord (4) est introduit sans filetage tandis que des éléments de fixation (6, 7) viennent en prise avec un filetage dans des ouvertures de fixation (51, 52) de l'élément de bride (5), et
    - l'élément de bride (5) étant réalisé d'une seule pièce,
    caractérisé en ce
    qu'une connexion de type fermeture à baïonnette (70) est prévue entre l'élément de bride (5) et le raccord (4).
  6. Dispositif d'injection de carburant selon la revendication 5, caractérisé en ce que le joint d'étanchéité métal-métal (9) entre le raccord (4) et le rail (2) est réalisé par une géométrie sphérique-conique.
  7. Dispositif d'injection de carburant selon la revendication 6, caractérisé en ce qu'une surface sphérique (41) est formée sur le raccord (4) et une surface conique (22) est formée sur le rail (2) .
  8. Dispositif d'injection de carburant selon l'une quelconque des revendications 5 à 7, caractérisé en ce qu'un élément de baïonnette (70) avec un premier et un deuxième côté aplati (72, 73) est disposé sur le raccord (4).
  9. Dispositif d'injection de carburant selon la revendication 8, caractérisé en ce qu'une première et une deuxième surface d'appui (74, 75) pour la contre-dépouille (42) du raccord (4) sont formées sur l'élément de bride (5).
  10. Dispositif d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisé par un biseau (62) sur l'élément de bride (5).
EP12700662.5A 2011-01-21 2012-01-17 Injecteur de carburant doté d'un raccord haute pression amélioré Active EP2665920B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011002996A DE102011002996A1 (de) 2011-01-21 2011-01-21 Kraftstoffeinspritzventil mit verbessertem Hochdruckanschluss
PCT/EP2012/050591 WO2012098087A1 (fr) 2011-01-21 2012-01-17 Injecteur de carburant doté d'un raccord haute pression amélioré

Publications (2)

Publication Number Publication Date
EP2665920A1 EP2665920A1 (fr) 2013-11-27
EP2665920B1 true EP2665920B1 (fr) 2020-09-30

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ID=45509483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12700662.5A Active EP2665920B1 (fr) 2011-01-21 2012-01-17 Injecteur de carburant doté d'un raccord haute pression amélioré

Country Status (7)

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

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EP2665920A1 (fr) 2013-11-27
US20130333669A1 (en) 2013-12-19
US10954906B2 (en) 2021-03-23
BR112013017608B1 (pt) 2021-07-20
WO2012098087A1 (fr) 2012-07-26
DE102011002996A1 (de) 2012-07-26
CN103328809A (zh) 2013-09-25
CN103328809B (zh) 2018-05-15
BR112013017608A2 (pt) 2016-10-18
JP2014502697A (ja) 2014-02-03
JP5774127B2 (ja) 2015-09-02

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