EP2090772B1 - Verbindungsanordnung - Google Patents

Verbindungsanordnung Download PDF

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Publication number
EP2090772B1
EP2090772B1 EP20080002855 EP08002855A EP2090772B1 EP 2090772 B1 EP2090772 B1 EP 2090772B1 EP 20080002855 EP20080002855 EP 20080002855 EP 08002855 A EP08002855 A EP 08002855A EP 2090772 B1 EP2090772 B1 EP 2090772B1
Authority
EP
European Patent Office
Prior art keywords
fuel
coupling
fuel injector
coupling element
tube
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.)
Ceased
Application number
EP20080002855
Other languages
English (en)
French (fr)
Other versions
EP2090772A1 (de
Inventor
Christiano Mannucci
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP20080002855 priority Critical patent/EP2090772B1/de
Publication of EP2090772A1 publication Critical patent/EP2090772A1/de
Application granted granted Critical
Publication of EP2090772B1 publication Critical patent/EP2090772B1/de
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding 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
    • 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

Definitions

  • the invention relates to a coupling assembly for hydraulically and mechanically coupling a fuel injector to a fuel rail of a combustion engine.
  • Coupling assemblies for hydraulically and mechanically coupling a fuel injector to a fuel rail are in widespread use, in particular for internal combustion engines. Fuel can be supplied to an internal combustion engine by the fuel rail assembly through the fuel injector.
  • Known fuel rails comprise a hollow body with recesses wherein the fuel injectors are arranged.
  • the connection of the fuel injectors to the recesses that supply the fuel from a fuel tank via a low or high-pressure fuel pump needs to be very precise to get a correct injection angle and a sealing of the fuel.
  • DE 60 2004 000 933 T2 discloses a fuel injection system for an internal combustion engine.
  • the device has a longitudinal body for each injector.
  • a tube connects the injector with a corresponding nozzle of a ramp.
  • the ramp and an electrical connection with a connector are joined to a control computer of an engine.
  • the tube has two ends with a knuckle and a blocking unit in a joining position to form an inseparable assembly having the ramp, tube and injector.
  • the object of the invention is to create a coupling assembly for hydraulically and mechanically coupling a fuel injector to a fuel rail which is simply to be manufactured and which facilitates a reliable and precise connection between the fuel rail and the fuel injector without a resting of the fuel injector on the cylinder head.
  • the invention is distinguished by a coupling assembly for hydraulically and mechanically coupling a fuel injector to a fuel rail of a combustion engine, the coupling assembly comprising a fuel injector with a fuel injector body and a central longitudinal axis, the fuel injector body comprising a cavity, and a fuel tube being hydraulically coupable to the fuel rail at a first end and having a free end section at a second end. The free end section of the fuel tube is arranged in the cavity of the fuel injector body.
  • a first coupling element is mechanically coupled to the fuel tube and a second coupling element is coupled to the fuel injector.
  • the first coupling element is designed to be in engagement with the second coupling element to retain the fuel tube in the fuel injector in direction of the central longitudinal axis.
  • the fuel tube comprises a collar extending in radial direction and being arranged axially between the fuel injector and the first coupling element in a way to prevent a movement of the fuel tube relative to the fuel injector in direction of the central longitudinal
  • the coupling assembly allows an assembly of the fuel injector and the fuel rail without a further metallic contact between the fuel injector and further parts of the combustion engine. Consequently, a noise transmission between the fuel injector and further parts of the combustion engine can be kept small. Furthermore, a simple and fast construction to fix the fuel tube in axial direction is possible.
  • a sealing element is arranged coaxially between the free end section of the fuel tube and the fuel injector body to sealingly couple the fuel tube to the fuel injector. This may allow a simple and compact construction of the sealing arrangement.
  • the first coupling element is a ring element and comprises a first screw thread.
  • the second coupling element is a ring element and comprises a second screw thread being in engagement with the first screw thread.
  • the first screw thread is a female screw thread and the second screw thread is a male screw thread.
  • the first coupling element is designed to be in a snap-in engagement with the second coupling element.
  • At least one of the coupling elements is designed to be rotatable around the central longitudinal axis relative to the fuel injector and the fuel tube.
  • the second coupling element is in one piece with the fuel injector body. This makes it possible to obtain a compact construction of the fuel injector. Furthermore, high pressure applications for the coupling assembly are obtainable.
  • the injector body has a supporting ring being arranged in the cavity and being designed to support the sealing element.
  • the supporting ring is in one piece with the injector body.
  • a fuel feed device 10 is assigned to an internal combustion engine 22 ( figure 1 ) which can be a diesel engine or a gasoline engine. It includes a fuel tank 12 that is connected via a first fuel line to a fuel pump 14. The output of the fuel pump 14 is connected to a fuel inlet 16 of a fuel rail 18. In the fuel rail 18, the fuel is stored for example under a pressure of about 200 bar in the case of a gasoline engine or of about 2,000 bar in the case of a diesel engine. Fuel injectors 20 are connected to the fuel rail 18 and the fuel is fed to the fuel injectors 20 via the fuel rail 18.
  • FIG. 2 shows a coupling assembly 60 with the fuel injector 20 in detail.
  • the fuel injector 20 has a fuel injector body 21 and is suitable for injecting fuel into a combustion chamber of the internal combustion engine 22.
  • the fuel injector 20 comprises a central longitudinal axis L.
  • the fuel injector 20 has a fuel inlet portion 24 and a fuel outlet portion 25.
  • the fuel inlet portion 24 of the fuel injector 20 comprises a sealing ring 48 with an outer surface 49.
  • the fuel injector 20 comprises a valve needle 26 taken in a cavity 29 of the fuel injector body 21.
  • an injection nozzle 28 is formed which is closed or opened by an axial movement of the valve needle 26. In a closing position a fuel flow through the injection nozzle 28 is prevented. In an opening position fuel can flow through the injection nozzle 28 into the combustion chamber of the internal combustion engine 22.
  • the coupling assembly 60 is designed to be coupled to the fuel rail 18 of the internal combustion engine 22.
  • the coupling assembly 60 has a fuel tube 30, a first coupling element 36 and a second coupling element 38.
  • the fuel tube 30 has an outer surface 33 and is hydraulically coupled to the fuel rail 18 at a first end. At a second end the fuel tube 30 comprises an end section 32. Furthermore, the fuel tube 30 is in engagement with the fuel inlet portion 24 of the fuel injector 20.
  • the fuel tube 30 has a collar 34 which is formed as a disk and is extending in radial direction between the fuel tube 30 and the first coupling element 36.
  • the collar 34 is arranged axially between the fuel injector 20 and the first coupling element 36. As the collar 34 is in one piece with the fuel tube 30 a movement of the fuel tube 30 relative to the fuel injector 20 in direction of the central longitudinal axis L can be prevented ( Figure 3 ).
  • the sealing ring 48 is arranged coaxially between the fuel tube 30 and the second coupling element 38 of the fuel injector 20.
  • the outer surface 49 of the sealing ring 48 is in sealing contact with the outer surface 33 of the fuel tube 30.
  • the fuel injector body 21 has a supporting ring 50 which is arranged in the cavity 29 and which is preferably in one piece with the injector body 21.
  • the sealing ring 48 is supported by the supporting ring 50.
  • the first coupling element 36 is coupled to the fuel tube 30.
  • the first coupling element 36 is formed as a ring element and has a centrally arranged through hole 42 and a first screw thread 44 which is a female screw thread.
  • the second coupling element 38 is formed as a ring element and is in one part with the fuel injector 20. By this a very rigid and very secure coupling between the fuel injector 20 and the second coupling element 38 is possible.
  • the second coupling element 38 has a second screw thread 46 which is a male screw thread.
  • the first coupling element 36 and the second coupling element 38 are fixedly coupled with each other by the screw threads 44, 46 ( figure 3 ).
  • the second coupling element 38 is fixedly coupled to the fuel injector 20 and the first coupling element 36 is fixedly coupled to the second coupling element 38 by the screw threads 44, 46, the fuel tube 30 is retained in the fuel injector 20 in direction of the central longitudinal axis L.
  • first coupling element 36 and the second coupling element 38 are forming an arrangement wherein the first coupling element 36 and the second coupling element 38 are in a snap-in engagement.
  • first coupling element 36 and the second coupling element 38 are forming a flange coupling.
  • the fuel tube 30 is inserted into the cavity 29 of the fuel injector 20.
  • the first coupling element 36 is shifted towards the second coupling element 38 of the fuel injector 20.
  • the first coupling element 36 is screwed together with the second coupling element 38 by a rotational movement of the first coupling element 36 around the central longitudinal axis L in a way that the threads 44, 46 of the first coupling element 36 and the second coupling element 38 come into engagement with each other.
  • Figure 3 shows the coupling assembly 60 after the mounting of the fuel tube 30 and the first coupling element 36 to the fuel injector 20.
  • the first coupling element 36 is unscrewed from the second coupling element 38 by a rotational movement of the first coupling element 36 around the central longitudinal axis L relative to the fuel injector 20.
  • the threads 44, 46 of the first coupling element 36 and the second coupling element 38 come out of engagement with each other. Then the fuel injector 20 can be shifted away from the fuel tube 30 in axial direction and the fuel tube 30 and the fuel injector 20 can be separated from each other.
  • the coupling of the fuel injector 20 with the fuel rail 18 by the coupling elements 36, 38 allows an assembly of the fuel injector 20 and the fuel tube 30 without a further metallic contact between the fuel injector 20 and the further parts of the internal combustion engine 22.
  • a sealing between the fuel injector body 21 and a combustion chamber of the internal combustion engine 22 can be carried out by a plastic element, in particular by a PTFE element. Consequently, noise transmission between the fuel injector 20 and further parts of the internal combustion engine can be kept small.

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

Claims (9)

  1. Kopplungsbaugruppe (60) für das hydraulische und mechanische Koppeln einer Kraftstoff-Einspritzvorrichtung (20) an eine Kraftstoff-Druckleitung (18) eines Verbrennungsmotors (22), wobei die Kopplungsbaugruppe (60) Folgendes umfasst:
    eine Kraftstoff-Einspritzvorrichtung (20) mit einem Kraftstoff-Einspritzvorrichtungskorpus (21) und einer Mittellängsachse (L), wobei der Kraftstoff-Einspritzvorrichtungskorpus (21) einen Hohlraum (29) umfasst, und
    ein Kraftstoffrohr (30), das an einem ersten Ende hydraulisch an die Kraftstoff-Druckleitung (18) gekoppelt werden kann und an einem zweien Ende eine freie Endsektion (32) hat, wobei die freie Endsektion (32) des Kraftstoffrohres (30) in dem Hohlraum (29) des Kraftstoff-Einspritzvorrichtungskorpus (21) angeordnet ist,
    wobei ein erstes Kopplungselement (36) mechanisch an das Kraftstoffrohr (30) gekoppelt ist und ein zweites Kopplungselement (38) an die Kraftstoff-Einspritzvorrichtung (20) gekoppelt ist, wobei das erste Kopplungselement (36) dafür ausgelegt ist, sich in Eingriff mit dem zweiten Kopplungselement (38) zu befinden, um das Kraftstoffrohr (30) in der Richtung der Mittellängsachse (L) in der Kraftstoff-Einspritzvorrichtung (20) festzuhalten, dadurch gekennzeichnet, dass das Kraftstoffrohr (30) einen Bund (34) umfasst, der sich in Radialrichtung erstreckt und in Axialrichtung wischen der Kraftstoff-Einspritzvorrichtung (20) und dem ersten Kopplungselement (36) angeordnet ist, auf eine solche Weise, dass er eine Bewegung des Kraftstoffrohres (30) im Verhältnis zu der Kraftstoff-Einspritzvorrichtung (20) in der Richtung der Mittellängsachse (L) verhindert.
  2. Kopplungsbaugruppe (60) nach Anspruch 1, wobei ein Abdichtungselement (48) koaxial wischen der freien Endsektion (32) des Kraftstoffrohres (30) und dem Kraftstoff-Einspritzvorrichtungskorpus (21) angeordnet ist, um das Kraftstoffrohr (30) abdichtend an die Kraftstoff-Einspritzvorrichtung (20) zu koppeln.
  3. Kopplungsbaugruppe (60) nach einem der vorhergehenden Ansprüche, wobei das erste Kopplungselement (36) ein Ringelement ist und ein erstes Schraubengewinde (44) umfasst und das zweite Kopplungselement (38) ein Ringelement ist und ein zweites Schraubengewinde (46) umfasst, das sich in Eingriff mit dem ersten Schraubengewinde (44) befindet.
  4. Kopplungsbaugruppe (60) nach Anspruch 3, wobei das erste Schraubengewinde (44) ein Schrauben-Innengewinde ist und das zweite Schraubengewinde (46) ein Schrauben-Außengewinde ist.
  5. Kopplungsbaugruppe (60) nach einem der vorhergehenden Ansprüche, wobei das erste Kopplungselement (36) dafür ausgelegt ist, sich in einem Einrast-Eingriff mit dem zweiten Kopplungselement (38) zu befinden.
  6. Kopplungsbaugruppe (60) nach einem der vorhergehenden Ansprüche, wobei wenigstens eines der Kopplungselemente (36, 38) dafür ausgelegt ist, im Verhältnis zu der Kraftstoff-Einspritzvorrichtung (20) und dem Kraftstoffrohr (30) um die Mittellängsachse (L) drehbar zu sein.
  7. Kopplungsbaugruppe (60) nach einem der vorhergehenden Ansprüche, wobei das zweite Kopplungselement (38) in einem Stück mit dem Kraftstoff-Einspritzvorrichtungskorpus (21) ist.
  8. Kopplungsbaugruppe (60) nach einem der vorhergehenden Ansprüche, wobei der Einspritzvorrichtungskorpus (21) einen Stützring (50) hat, der in dem Hohlraum (29) angeordnet ist und dafür ausgelegt ist, das Abdichtungselement (48) zu stützen.
  9. Kopplungsbaugruppe (60) nach Anspruch 8, wobei der Stützring (50) in einem Stück mit dem Einspritzvorrichtungskorpus (21) ist.
EP20080002855 2008-02-15 2008-02-15 Verbindungsanordnung Ceased EP2090772B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20080002855 EP2090772B1 (de) 2008-02-15 2008-02-15 Verbindungsanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20080002855 EP2090772B1 (de) 2008-02-15 2008-02-15 Verbindungsanordnung

Publications (2)

Publication Number Publication Date
EP2090772A1 EP2090772A1 (de) 2009-08-19
EP2090772B1 true EP2090772B1 (de) 2012-04-25

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Application Number Title Priority Date Filing Date
EP20080002855 Ceased EP2090772B1 (de) 2008-02-15 2008-02-15 Verbindungsanordnung

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EP (1) EP2090772B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009050337A1 (de) * 2009-10-22 2011-04-28 GM Global Technology Operations, Inc., Detroit Bauteileeinheit für ein Kraftstoffsystem einer Brennkraftmaschine sowie Brennkraftmaschine
EP2698526B1 (de) * 2012-08-13 2017-06-07 Continental Automotive GmbH Kupplungsvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4131537A1 (de) * 1991-09-21 1993-04-01 Bosch Gmbh Robert Brennstoffverteiler
FR2852636B1 (fr) 2003-03-19 2005-06-17 Peugeot Citroen Automobiles Sa Dispositif d'injection de carburant pour moteur a combustion interne, notamment d'un vehicule automobile.
DE102004046888A1 (de) * 2004-09-28 2006-03-30 Robert Bosch Gmbh Injektor zur Kraftstoffeinspritzung an einer Brennkraftmaschine
DE102005057951A1 (de) * 2005-12-05 2007-06-06 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

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