EP2090772A1 - Verbindungsanordnung - Google Patents

Verbindungsanordnung Download PDF

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Publication number
EP2090772A1
EP2090772A1 EP08002855A EP08002855A EP2090772A1 EP 2090772 A1 EP2090772 A1 EP 2090772A1 EP 08002855 A EP08002855 A EP 08002855A EP 08002855 A EP08002855 A EP 08002855A EP 2090772 A1 EP2090772 A1 EP 2090772A1
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.)
Granted
Application number
EP08002855A
Other languages
English (en)
French (fr)
Other versions
EP2090772B1 (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.
  • 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.
  • 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.
  • 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.
  • 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 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 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 axis.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
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 true EP2090772A1 (de) 2009-08-19
EP2090772B1 EP2090772B1 (de) 2012-04-25

Family

ID=39615750

Family Applications (1)

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

Country Status (1)

Country Link
EP (1) EP2090772B1 (de)

Cited By (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
CN103590948A (zh) * 2012-08-13 2014-02-19 大陆汽车有限公司 联接装置

Citations (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
DE102004046888A1 (de) * 2004-09-28 2006-03-30 Robert Bosch Gmbh Injektor zur Kraftstoffeinspritzung an einer Brennkraftmaschine
DE602004000933T2 (de) 2003-03-19 2006-12-28 Peugeot Citroen Automobiles S.A. Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine, insbesondere eines Kraftfahrzeugs
EP1793119A1 (de) * 2005-12-05 2007-06-06 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

Patent Citations (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
DE602004000933T2 (de) 2003-03-19 2006-12-28 Peugeot Citroen Automobiles S.A. Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine, insbesondere eines Kraftfahrzeugs
DE102004046888A1 (de) * 2004-09-28 2006-03-30 Robert Bosch Gmbh Injektor zur Kraftstoffeinspritzung an einer Brennkraftmaschine
EP1793119A1 (de) * 2005-12-05 2007-06-06 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

Cited By (6)

* 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
CN103590948A (zh) * 2012-08-13 2014-02-19 大陆汽车有限公司 联接装置
EP2698526A1 (de) * 2012-08-13 2014-02-19 Continental Automotive GmbH Kupplungsvorrichtung
KR20140021978A (ko) * 2012-08-13 2014-02-21 콘티넨탈 오토모티브 게엠베하 커플링 장치
US10480469B2 (en) 2012-08-13 2019-11-19 Continental Automotive Gmbh Coupling device
KR102051992B1 (ko) 2012-08-13 2019-12-04 콘티넨탈 오토모티브 게엠베하 커플링 장치

Also Published As

Publication number Publication date
EP2090772B1 (de) 2012-04-25

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