EP1118766B1 - Système d'injection de combustible pour moteur à combustion interne - Google Patents

Système d'injection de combustible pour moteur à combustion interne Download PDF

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Publication number
EP1118766B1
EP1118766B1 EP20000127084 EP00127084A EP1118766B1 EP 1118766 B1 EP1118766 B1 EP 1118766B1 EP 20000127084 EP20000127084 EP 20000127084 EP 00127084 A EP00127084 A EP 00127084A EP 1118766 B1 EP1118766 B1 EP 1118766B1
Authority
EP
European Patent Office
Prior art keywords
pressure
injection system
injector
connection point
cone
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.)
Expired - Lifetime
Application number
EP20000127084
Other languages
German (de)
English (en)
Other versions
EP1118766A3 (fr
EP1118766A2 (fr
Inventor
Helmut Hummel
Hinrich Dr. Krüger
Martin Werner
Michael Wirkowski
Eckbert Zander
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.)
Siemens AG
Original Assignee
Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1118766A2 publication Critical patent/EP1118766A2/fr
Publication of EP1118766A3 publication Critical patent/EP1118766A3/fr
Application granted granted Critical
Publication of EP1118766B1 publication Critical patent/EP1118766B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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 an injection system for fuel injection systems according to the preamble of patent claim 1.
  • Generic injection systems are known for example for diesel engines under the term "common rail system".
  • several injectors from a high pressure reservoir are supplied with fuel via a rail called a “rail”, which they inject into the combustion chambers of the engine during a certain injection time with a high pressure of up to more than 1500 bar.
  • a generic injection system in which the high-pressure connection point and the injector are connected to each other via screw with at least one union nut is known for example from DE 195 39 883 A1 and DE 196 07 521 C1.
  • this known injection system arranged at a high-pressure connection point and the injector interconnecting fuel line union nuts are screwed onto the high-pressure connection point or a connecting piece of the injector.
  • This type of sealing is also used with other conduit connections, e.g. between the pump and the rail. The sealing of the joints is done via upturned at the ends of the fuel line nipple.
  • DE 1 947 175 A provides a pressure limiting device in which the pressure is reduced by means of a through bore guided through the screw connection.
  • a disadvantage of such a solution is that a sharp-jet fuel jet can escape from the screw, which can lead to injury.
  • the present invention seeks to provide an injection system of the type mentioned in such a way that a loosening of the screw is safe even under pressure.
  • the inventive design of the injection system has the advantage that due to the pressure limiting device within the screw for the first time can not build up the durability of the screw endangering pressure, and when releasing the screw no sharp-jet fuel jet can escape from the screw.
  • Figure 1 shows a connection point between a fuel line 1 and a high pressure port 2 of a common rail injection system.
  • the high pressure port 2 is connected via the fuel line 1 with an injector, not shown, via which the fuel is injected at a pressure of up to 1500 bar in a combustion chamber of a diesel engine.
  • the high-pressure connection point 2 also called fuel distributor, called “rail” or pressure accumulator, is preferably connected at its front side with a high-pressure pump, which promotes fuel through the axial recess of the high-pressure connection point 2 in the fuel line 1.
  • the fuel line 1 and the high pressure port 2 are connected to each other via a screw 3, which consists of a pushed over the fuel line 1 union nut 4 with internal thread 5 and provided with an external thread 6, welded to the high pressure port 2 nozzle 7 ,
  • the connection, not shown, between the fuel line 1 and the injector may also be formed as a further screw with a further union nut.
  • the pressure-tight seal between the fuel line 1 on the one hand and the high pressure port 2 on the other hand takes place in the embodiments shown in Figures 1 and 2 via an upset keglige or spherical sealing surface 9.
  • the hollow truncated cone-shaped surface on the inside of Union nut 4 serves as a contact surface 8 for the upper nut 4 with respect to the nipple 14 of the fuel line 1 above the sealing surface 9.
  • the front end of the fuel line 1 is pressed against the conical surface of the high-pressure port 2, whereby the resulting sealing surface 9, the fuel-carrying lines of the high pressure port 2 and the fuel line 1 seals to the outside.
  • the two surfaces 8 and 9 are spaced apart in this embodiment by a cylindrical pipe section with a substantially constant cross-section.
  • the sealing surface 9 When loosening the screw 3 under pressure, the sealing surface 9 is first lifted from its sealing seat to the high pressure port 2, which now wants to build up within the screw 3, the high operating pressure in the inner side of the nut 4, since the surface 8 at least partially sealing abuts against the contact surface of the union nut 4.
  • a pressure limiting device is formed in the region of the screw 3.
  • the pressure limiting device is formed as the inner region of the screw 3 with the ambient pressure connecting through hole 11.
  • the through hole 11 is formed just above the sealing surface 9 of the high pressure port 2 through the preferably hollow cylindrical nozzle 7 transversely to its longitudinal axis.
  • the through hole 11 is particularly deeply arranged on the nozzle 7 to ensure that the through hole 11 is not closed by the union nut 4 even when fully tightened screw 3.
  • the second embodiment shown in Figure 2 differs from that according to Figure 1 in that on the top nut 4 a circumferential, the region of the internal thread 5 in the on-the-neck screwing outstanding edge 12 is integrally formed, the external thread 6 with axial Distance to this at least over the outlet opening of the through hole 11 projects beyond. Due to the formation of this edge 12 on the union nut 4, the escape of a sharp-jet fuel jet from the through hole 11 is to be prevented. The length of the edge is to be dimensioned so that it still covers the through hole 11 even after loosening the nut 4 by several threads.
  • the edge 12 of the union nut 4 is used in this embodiment as a baffle for the exiting fuel jet.
  • the gap formed by the distance of the edge 12 from the external thread 6 13 is sufficiently large enough to ensure easy flow of the fuel.
  • the through hole 11 is not formed in the nozzle 7, but in the union nut 4, just below the pressure surface 8 between the fuel line 1 and the union nut 4.
  • this arrangement of the pressure limiting device is also suitable for the illustrated sealing connection with a short head nipple according to ISO 2974.
  • the pressure limiting devices described are of course also used in injection systems in which the seal between the fuel line 1 and the high-pressure connection point 2 or the injector or the pump is not caused by the conical sealing surface 9, but by sealing rings and / or the injector without interposed fuel line. 1 is bolted directly to the high pressure port 2.
  • the described embodiment of the injection system according to the invention with a pressure limiting device in the region of the screw connection 3 ensures that even when loosening the screw connection 3 under pressure, no great force can occur that could destroy the thread and / or the neck weld seam. In addition, it is ensured that when disengaging the screw no sharp-jet fuel jet can escape from the screw, which is why a thus configured injection system is particularly safe.

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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 (7)

  1. Système d'injection pour installations d'injection de carburant, comprenant un injecteur relié à un point de raccord haute pression (2) pour injecter du carburant à partir d'un accumulateur haute pression, alimenté par une pompe haute pression, dans une chambre de combustion d'un moteur à combustion interne, le point de raccord haute pression (2) et l'injecteur étant connectés ensemble par au moins un raccord vissé (3) comportant un écrou à chapeau (4), au moins un dispositif de limitation de pression étant prévu dans la région du raccord vissé (3) qui est réalisé sous forme de trou de passage (11) reliant la zone interne du raccord vissé (3) à la pression ambiante,
    caractérisé en ce qu'un rebord (12) périphérique et dépassant la zone de filetage de l'écrou-raccord (4) dans la direction du vissage est formé sur le au moins un écrou-raccord (4), ce rebord dépassant à distance le contre-filet du point de raccord haute pression au moins jusqu'à l'ouverture de sortie du trou de passage (11).
  2. Système d'injection selon la revendication 1, caractérisé en ce que le trou de passage (11) est réalisé à angle droit par rapport à l'axe longitudinal du raccord vissé (3).
  3. Système d'injection selon la revendication 1, caractérisé en ce que le trou de passage (11) est réalisé avec un angle divergeant de l'angle droit par rapport à l'axe longitudinal du raccord vissé (3).
  4. Système d'injection selon au moins une des revendications 1 à 3, caractérisé en ce que le point de raccord haute pression (2) et l'injecteur sont connectés ensemble par une conduite de carburant (1).
  5. Système d'injection selon la revendication 4, caractérisé en ce qu'au moins une zone d'étanchéité entre la conduite de carburant (1) et le point de raccord haute pression (2) ou, respectivement, l'injecteur ou la pompe haute pression est réalisée en mamelon refoulé et doté d'une face de joint conique (9) à appariement cône à cône, cône à sphère ou sphère à sphère.
  6. Système d'injection selon la revendication 4, caractérisé en ce qu'au moins une zone d'étanchéité entre la conduite de carburant (1) et le point de raccord haute pression (2) ou, respectivement, l'injecteur ou la pompe haute pression comporte une face de joint conique (9) refoulée à appariement cône à cône, cône à sphère ou sphère à sphère qui sont disposés à distance via un tronçon de conduite cylindrique (10) ayant sensiblement une aire de section transversale constante.
  7. Système d'injection selon la revendication 4, caractérisé en ce qu'une face de joint est formée entre la conduite de carburant (1) et le point de raccord haute pression (2) ou, respectivement, l'injecteur ou la pompe haute pression, cette face étant réalisée en joint plan avec ou sans étanchéification additionnelle, ou en joint à arête mordante.
EP20000127084 2000-01-20 2000-12-11 Système d'injection de combustible pour moteur à combustion interne Expired - Lifetime EP1118766B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10002365 2000-01-20
DE2000102365 DE10002365B4 (de) 2000-01-20 2000-01-20 Einspritzsystem für Kraftstoffeinspritzanlagen

Publications (3)

Publication Number Publication Date
EP1118766A2 EP1118766A2 (fr) 2001-07-25
EP1118766A3 EP1118766A3 (fr) 2003-08-06
EP1118766B1 true EP1118766B1 (fr) 2006-03-22

Family

ID=7628174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000127084 Expired - Lifetime EP1118766B1 (fr) 2000-01-20 2000-12-11 Système d'injection de combustible pour moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP1118766B1 (fr)
DE (2) DE10002365B4 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10219259A1 (de) * 2002-04-30 2003-11-20 Bosch Gmbh Robert Verbindungsvorrichtung mit einer Spannmutter mit Rechts- und Linksgewinde
DE10234723B4 (de) * 2002-07-30 2005-04-07 Siemens Ag Druckdichte Verbindungsanordnung für Teile eines Kraftstoffeinspritzsystems, insbesondere hochdruckdichte Verbindungsanordnung für Teile eines Kraftstoffinjektors
FR2878604B1 (fr) * 2004-11-30 2007-02-16 Renault Sas Agencement pour le raccordement d'un tuyau sur un embout et procede de mesure de l'effort de serrage dans un tel agencememnt
DE102005003519A1 (de) * 2005-01-25 2006-08-03 Benteler Automobiltechnik Gmbh Verbindungsanordnung für Rohre
EP1783357B1 (fr) * 2005-11-02 2008-06-04 Delphi Technologies, Inc. Structure de connexion pour l'alimentation haute pression en carburant pour un injecteur
GB2614244A (en) * 2021-12-22 2023-07-05 Delphi Tech Ip Ltd Fuel-rail assembly

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402703A (en) * 1966-07-08 1968-09-24 Int Harvester Co Fuel connection to cylinder head
DK114737B (da) * 1967-10-03 1969-07-28 Burmeister & Wains Mot Mask Rørsamling, navnlig til hojtryksrør.
US3584900A (en) * 1968-09-18 1971-06-15 Sno Trik Co High-pressure sealing and gripping device
GB2107809A (en) * 1981-10-16 1983-05-05 Rolls Royce Fuel pipe seal
DE3907958A1 (de) * 1989-03-11 1990-09-13 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE4407306C1 (de) * 1994-03-04 1995-09-07 Guido Juergen Dipl Ing Druckleitungsanschluß
DE19539883B4 (de) * 1995-05-26 2011-06-01 Robert Bosch Gmbh Kraftstoffversorgungsanlage und Verfahren zum Betreiben einer Brennkraftmaschine
DE19531743C1 (de) * 1995-08-29 1996-12-05 Guido Jurgen Abdrückvorrichtung
DE19607521C1 (de) * 1996-02-28 1997-04-10 Juergen Dipl Ing Guido Kraftstoff-Verteilerrohr

Also Published As

Publication number Publication date
DE10002365A1 (de) 2001-08-02
DE10002365B4 (de) 2005-12-01
EP1118766A3 (fr) 2003-08-06
EP1118766A2 (fr) 2001-07-25
DE50012438D1 (de) 2006-05-11

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