EP2284385B1 - Dispositif de rampe de carburant - Google Patents

Dispositif de rampe de carburant Download PDF

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Publication number
EP2284385B1
EP2284385B1 EP20090008906 EP09008906A EP2284385B1 EP 2284385 B1 EP2284385 B1 EP 2284385B1 EP 20090008906 EP20090008906 EP 20090008906 EP 09008906 A EP09008906 A EP 09008906A EP 2284385 B1 EP2284385 B1 EP 2284385B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pipe
fuel rail
fuel injector
union
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.)
Not-in-force
Application number
EP20090008906
Other languages
German (de)
English (en)
Other versions
EP2284385A1 (fr
Inventor
Gisella Di Domizio
Edoardo Giorgetti
Daniel Marc
Giandomenico Serra
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 EP20090008906 priority Critical patent/EP2284385B1/fr
Publication of EP2284385A1 publication Critical patent/EP2284385A1/fr
Application granted granted Critical
Publication of EP2284385B1 publication Critical patent/EP2284385B1/fr
Not-in-force 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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 fuel rail device of a combustion engine. Furthermore, the invention relates to a fuel rail fuel injector assembly, comprising a coupling assembly for hydraulically and mechanically coupling a fuel injector to a fuel rail of a combustion engine.
  • Fuel rail devices and 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 device and the coupling assembly through the fuel injector.
  • a fuel accumulator to which the fuel injectors are connected and which has a relatively large volume.
  • a fuel accumulator is often referred to as a fuel rail.
  • the fuel injectors can be coupled to the fuel rail in different manners.
  • Known fuel rails comprise a hollow body with recesses in form of fuel injector cups, wherein the fuel injectors are arranged.
  • the connection of the fuel injectors to the fuel injector cups 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 fuel rail device and a coupling assembly for hydraulically and mechanically coupling a fuel injector to a fuel rail which are simply to be manufactured and which facilitate a reliable and precise connection between the fuel rail and the fuel injector without a resting of the fuel injector on the cylinder head of the combustion engine.
  • the invention is distinguished by a fuel rail device of a combustion engine.
  • the fuel rail device comprises a fuel rail and a union having a longitudinal axis.
  • the union is fixedly coupled to the fuel rail and is in hydraulic communication with the fuel rail.
  • the fuel rail device comprises a pipe which is partially engaged by the union and is designed to be in hydraulic communication with a fuel injector.
  • the fuel rail device comprises a sealing ring.
  • the sealing ring is arranged coaxially to the pipe and is arranged radially between the union and the pipe and is designed to sealingly couple the union to the pipe.
  • the pipe has an outer surface comprising a groove.
  • the groove faces the union, and the sealing ring s partially arranged in the groove.
  • the pipe comprises a tube and a ring holder element which is arranged coaxially to the tube.
  • the ring holder element is fixedly coupled to the tube.
  • the ring holder element comprises the groove.
  • a part of the ring holder element extends in axial direction from an axial end of the tube facing the fuel rail in a manner that the ring holder element covers at least partially the axial end of the tube. This has the advantage that the ring holder element can protect the axial end of the tube facing the fuel rail against mechanical stress or damage.
  • the ring holder element is welded or brazed to the tube. This has the advantage that a secure fixing of the ring holder element relative to the tube is possible.
  • the union is welded or brazed to the fuel rail. This has the advantage that a secure fixing of the union relative to the fuel rail is possible.
  • the pipe comprises a flange and a clip element is arranged coaxially to the pipe.
  • the clip element is in engagement with the union and the flange to prevent an axial movement of the pipe relative to the union.
  • the invention is distinguished by a fuel rail fuel injector assembly with a fuel rail device according to the first aspect of the invention and a coupling assembly.
  • the fuel rail device is mechanically and hydraulically coupled to the coupling assembly.
  • the coupling assembly comprises a fuel injector with a fuel injector body and a central longitudinal axis.
  • the fuel injector body comprises a partially cone-shaped cavity.
  • the coupling assembly comprises a fuel pipe which is hydraulically coupable to the fuel rail and a cup-shaped coupling element.
  • the cup-shaped coupling element is in engagement with the fuel injector body to retain the fuel pipe in the fuel injector in direction of the central longitudinal axis.
  • the fuel pipe has a rounded end section which is at least partially arranged in the partially cone-shaped cavity and is in direct contact with the fuel injector body.
  • this coupling assembly is that the fuel pipe is flexible relative to the injector body. Furthermore, a compensation of mechanical stress is possible. In particular, it is easy possible that the end section is limited pivotable relative to the fuel injector body. Furthermore, 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.
  • the fuel injector body comprises an outer screw thread and the cup-shaped coupling element comprises an inner screw thread which is in engagement with the outer screw thread of the fuel injector body.
  • a clamp element is fixedly coupled to a cylinder head of the combustion engine and comprises an aperture being designed to engage the fuel pipe to enable a mechanical cooperation between the fuel pipe and the cylinder head.
  • 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.
  • Figure 2 shows a configuration of a fuel rail device 60 which comprises the fuel rail 18 and a fuel pipe 24.
  • the pipe 24 may be in hydraulic communication with the fuel injector 20.
  • the pipe 24 comprises a tube 26 and a ring holder element 28 which is arranged coaxially to the tube 26 and which is fixedly coupled to the tube 26.
  • the ring holder element 28 is welded or brazed to the tube 26.
  • the pipe 24 has an outer surface 30 which comprises a groove 32.
  • the groove 32 faces a union 34 which is fixedly coupled to the fuel rail 18.
  • the union 34 is welded or brazed to the fuel rail 18.
  • the union 34 is shaped as a hollow cylinder with a longitudinal axis L1 and makes a hydraulic communication with the fuel rail 18 possible.
  • the union 34 receives a part of the pipe 24.
  • the fuel rail device 60 has a sealing ring 38 which is arranged in the groove 32 in radial direction between the fuel pipe 24 and the union 34.
  • the sealing ring 38 has an outer surface 40.
  • the outer surface 40 of the sealing ring 38 is in sealing contact with the outer surface 30 of the fuel pipe 24.
  • the fuel rail device 60 has a supporting ring 42 which is arranged in the groove 32 in radial direction between the fuel pipe 24 and the union 34.
  • the sealing ring 38 is supported by the supporting ring 42 to avoid an axial movement of the sealing ring 38 relative to the pipe 24.
  • the pipe 24, preferably the ring holder element 28 has a flange 44 extending in radial direction from the tube 26. Coaxially to the pipe 24 a clip element 46 is arranged. The clip element 46 is engaged with the union 34 and the flange 44.
  • Figure 3 shows an embodiment of the fuel rail device 60 in which a part 49 of the ring holder element 28 extends in axial direction from an axial end 48 of the tube 26 which faces the fuel rail 18.
  • the part 49 of the ring holder element 28 is shaped as a collar which covers or overlaps the axial end 48 of the tube 26 in axial direction. This makes it possible that the collar-shaped part 49 protects the axial end 48 of the tube 26 against mechanical damage.
  • FIG 4 shows a configuration of the fuel rail device 60 wherein the pipe 24 has a corrugated section 50.
  • the corrugated section 50 of the pipe 24 comprises at least the flange 44 and the groove 32 which may receive the sealing ring 38 and the supporting ring 42.
  • the corrugated section 50 is preferably produced by stamping, cold-forming or hot-forming the pipe 24.
  • the ring holder element 28 can be left and a low mass and a low weight of the pipe 24 can be obtained. This configuration, however, does not fall within the scope of the appended claims.
  • Figure 5 shows a configuration of the fuel rail device 60 wherein the union 34 comprises an inner surface 52.
  • a union groove 54 is arranged which faces the tube 26.
  • a circlip 56 is arranged in the union groove 54.
  • the circlip 56 is in mechanical cooperation with the sealing ring 38 and the supporting ring 42.
  • the circlip 56 supports the sealing ring 38 and consequently prevents an axial movement of the sealing ring 38 relative to the union 34. This makes a secure sealing between the tube 26 and the union 34 possible.
  • FIG. 6 shows a coupling assembly 90 with the fuel injector 20 in detail.
  • the coupling assembly 90 may be coupled to the fuel rail 18 of the internal combustion engine 22.
  • the coupling assembly 90 comprises the fuel pipe 24 and the fuel injector 20 with a fuel injector body 62 and a central longitudinal axis L2.
  • the fuel injector body 62 has a cavity 64 which is partially cone-shaped.
  • the pipe 24 has an outer surface 68 and is hydraulically coupled to the fuel rail 18 at a first end which is for example the axial end 48 in Figures 2 to 5 .
  • the pipe 24 comprises a spherical or rounded end section 66.
  • the end section 66 of the pipe 24 is in partial engagement with the partially cone-shaped cavity 64 of the fuel injector body 62. Therefore, a direct metal-to-metal contact between the pipe 24 and the fuel injector body 62 can be obtained. A sealing element can be avoided.
  • the end section 66 is slightly pivotable relative to the fuel injector body 62. Consequently, the pipe 24 is flexible relative to the injector body 62 and mechanical stress on the pipe 24 can be avoided.
  • the coupling assembly 90 has a cup-shaped coupling element 70 which is in engagement with the fuel injector body 62 to retain the fuel pipe 24 in the fuel injector 20 in direction of the central longitudinal axis L2.
  • the coupling element 70 is formed as a ring element and has a centrally arranged through hole 72 and a screw thread 74 which is a female screw thread.
  • the coupling element 70 is formed as a nut.
  • the fuel injector body 62 has a screw thread 76 which is a male screw thread.
  • the fuel injector body 62 and the coupling element 70 are fixedly coupled with each other by the screw threads 74, 76.
  • the coupling element 70 is fixedly coupled to the fuel injector body 62 by the screw threads 74, 76, the fuel pipe 24 is retained in the fuel injector 20 in direction of the central longitudinal axis L2.
  • a clamp element 78 is coupled to a cylinder head 84 of the combustion engine 22.
  • the clamp element 78 has a protrusion which extends in radial direction relative to the longitudinal axis L2 of the fuel injector body 62.
  • the protrusion has an orifice which is designed to take in a fixing element 80.
  • the fixing element 80 is designed to rigidly couple the clamp element 78 to the cylinder head 84.
  • the fixing element 80 is preferably a screw but it may also be of another type as a pin or a bolt as long as it enables a fixed coupling of the fuel injector body 62 to the cylinder head 84.
  • the clamp element 78 has an aperture 82 which may receive the pipe 24 to enable a mechanical cooperation between the pipe 24 and the cylinder head 84.
  • the pipe 24 can limitedly move in the aperture 82 in axial direction relative to the cylinder head 84 to avoid mechanical stress on the pipe 24.
  • a distance element 88 is arranged that may give a fixed distance between the fuel injector body 62 and the cylinder head 84 and receive the fixing element 80.

Landscapes

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

Claims (7)

  1. Dispositif à rampe à carburant (60) d'un moteur à combustion (22), le dispositif à rampe à carburant (60) comprenant :
    - une rampe à carburant (18),
    - une union (34) possédant un axe longitudinal (L1), accouplée de façon fixe à la rampe à carburant (18) et en communication hydraulique avec la rampe à carburant (18),
    - un tuyau (24), avec lequel l'union (34) entre partiellement en prise, et conçu pour être en communication hydraulique avec un injecteur de carburant (20), et
    - une bague d'étanchéité (38) agencée de façon coaxiale sur le tuyau (24) et agencée radialement entre l'union (34) et le tuyau (24) et conçue pour accoupler de façon étanche l'union (34) au tuyau (24),
    dans lequel le tuyau (24) comporte une surface extérieure (30) comprenant une rainure (32) faisant face à l'union (34), et la bague d'étanchéité (38) est partiellement agencée dans la rainure (32),
    dans lequel le tuyau (24) comprend un tube (26) et un élément de retenue de bague (28) qui est agencé de façon coaxiale par rapport au tube (26) et qui est accouplé de façon fixe au tube (26), et l'élément de retenue de bague (28) comprend la rainure (32), et
    dans lequel une partie (49) de l'élément de retenue de bague (28) s'étend dans une direction axiale à partir d'une extrémité axiale (48) du tube (26) faisant face à la rampe à carburant (18) de manière telle que l'élément de retenue de bague (28) couvre au moins partiellement l'extrémité axiale (48) du tube (26).
  2. Dispositif à rampe à carburant (60) selon la revendication 1, dans lequel l'élément de retenue de bague (28) est soudé ou brasé sur le tube (26).
  3. Dispositif à rampe à carburant (60) selon une des revendications précédentes, dans lequel l'union (34) est soudée ou brasée sur la rampe à carburant (18).
  4. Dispositif à rampe à carburant (60) selon une des revendications précédentes, dans lequel le tuyau (24) comprend une bride (44), et un élément à attache (46) est agencé de façon coaxiale sur le tuyau (24), et l'élément à attache (46) est en prise avec l'union (34) et la bride (44) pour empêcher un mouvement axial du tuyau (24) par rapport à l'union (34).
  5. Ensemble à rampe à carburant et à injecteur de carburant avec un dispositif à rampe à carburant (60) selon une des revendications précédentes et un ensemble à accouplement (90) pour accoupler hydrauliquement et mécaniquement un injecteur de carburant (20) à une rampe à carburant (18) d'un moteur à combustion (22), l'ensemble à accouplement (90) comprenant :
    - un injecteur de carburant (20) avec un corps d'injecteur de carburant (62) et un axe longitudinal central (L2), le corps d'injecteur de carburant (62) comprenant un cavité partiellement en forme de cône (64),
    - un tuyau à carburant (24) pouvant être hydrauliquement accouplé à la rampe à carburant (18), et
    - un élément à accouplement en forme de coupelle (70) en prise avec le corps d'injecteur de carburant (62) pour retenir le tuyau à carburant (24) dans l'injecteur de carburant (20) dans une direction de l'axe longitudinal central (L2), dans lequel
    le tuyau à carburant (24) comporte une section d'extrémité arrondie (66) qui est au moins partiellement agencée dans la cavité partiellement en forme de cône (64) et est en contact direct avec le corps d'injecteur de carburant (62), et dans lequel le dispositif à rampe à carburant (60) est accouplé mécaniquement et hydrauliquement à l'ensemble à accouplement (90).
  6. Ensemble à rampe à carburant et à injecteur de carburant selon la revendication 5, dans lequel le corps d'injecteur de carburant (62) comprend un filet de vis extérieur (76) et l'élément à accouplement en forme de coupelle (70) comprend un filet de vis intérieur (74) qui est en prise avec le filet de vis extérieur (76) du corps d'injecteur de carburant (62).
  7. Ensemble à rampe à carburant et à injecteur de carburant selon la revendication 5 ou 6, dans lequel un élément de serrage (78) est accouplé de façon fixe à une culasse de cylindre (84) du moteur à combustion (22) et comprend une ouverture (82) conçue pour venir en prise avec le tuyau à carburant (24) pour permettre une coopération mécanique entre le tuyau à carburant (24) et la culasse de cylindre (84).
EP20090008906 2009-07-07 2009-07-07 Dispositif de rampe de carburant Not-in-force EP2284385B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20090008906 EP2284385B1 (fr) 2009-07-07 2009-07-07 Dispositif de rampe de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20090008906 EP2284385B1 (fr) 2009-07-07 2009-07-07 Dispositif de rampe de carburant

Publications (2)

Publication Number Publication Date
EP2284385A1 EP2284385A1 (fr) 2011-02-16
EP2284385B1 true EP2284385B1 (fr) 2014-06-25

Family

ID=41396489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090008906 Not-in-force EP2284385B1 (fr) 2009-07-07 2009-07-07 Dispositif de rampe de carburant

Country Status (1)

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EP (1) EP2284385B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013222508B4 (de) * 2013-11-06 2023-07-27 Robert Bosch Gmbh Ventil zum Zumessen von unter Hochdruck stehendem Fluid
KR101974292B1 (ko) * 2014-11-19 2019-04-30 콘티넨탈 오토모티브 게엠베하 내연 엔진용 연료 레일 조립체
US10208723B2 (en) 2016-05-25 2019-02-19 Hi-Vol Products Threaded fuel rails
EP3418550B1 (fr) 2017-06-20 2019-11-20 Hi-Vol Products LLC Rails de carburant filetés

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19601496C2 (de) * 1996-01-17 1998-07-30 Man Nutzfahrzeuge Ag Anschluß einer Einspritzleitung an ein Druckrohr eines Einspritzventils
DE19756102A1 (de) * 1997-12-17 1999-06-24 Bosch Gmbh Robert Montagevorrichtung zum Montieren von Brennstoffeinspritzventilen
DE19933256A1 (de) * 1999-07-15 2001-01-25 Bosch Gmbh Robert Anschlussstutzen und Gehäuse, insbesondere Kraftstoffhochdruckspeicher, mit vorgespannt angeschweißtem Anschlussstutzen für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen
US6830037B1 (en) * 2004-01-27 2004-12-14 Delphi Technologies, Inc. Anti-rotation fuel injector clip
FR2869367A1 (fr) * 2004-04-21 2005-10-28 Renault Sas Dispositif de raccordement d'un tube d'injection de carburant sous pression
FR2890123B1 (fr) * 2005-08-29 2007-11-23 Peugeot Citroen Automobiles Sa Dispositif de fixation d'au moins un injecteur sur une culasse et moteur a combustion interne comprenant un tel dispositif
DE602006002803D1 (de) * 2006-02-08 2008-10-30 Siemens Ag Verbindungsanordnung zum Verbinden eines Injektors mit einer Fluid-Versorgung
US7406946B1 (en) * 2007-04-02 2008-08-05 Hitachi, Ltd. Method and apparatus for attenuating fuel pump noise in a direct injection internal combustion chamber
EP2188516B1 (fr) * 2007-09-13 2011-10-26 Ganser-Hydromag AG Dispositif d'injection de carburant
EP2058509B1 (fr) * 2007-11-12 2012-07-18 Continental Automotive GmbH Raccord

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