EP1775460B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1775460B1
EP1775460B1 EP06120585A EP06120585A EP1775460B1 EP 1775460 B1 EP1775460 B1 EP 1775460B1 EP 06120585 A EP06120585 A EP 06120585A EP 06120585 A EP06120585 A EP 06120585A EP 1775460 B1 EP1775460 B1 EP 1775460B1
Authority
EP
European Patent Office
Prior art keywords
nozzle body
fuel injection
clamping nut
nozzle
injection valve
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
EP06120585A
Other languages
German (de)
English (en)
Other versions
EP1775460A1 (fr
Inventor
Joachim Boltz
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 EP1775460A1 publication Critical patent/EP1775460A1/fr
Application granted granted Critical
Publication of EP1775460B1 publication Critical patent/EP1775460B1/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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members

Definitions

  • the present invention relates to a fuel injection valve for an internal combustion engine having a nozzle body clamped to a nozzle holder by means of a clamping nut for receiving a nozzle needle which cooperates with a arranged at the distal end of the nozzle body valve seat, wherein the nozzle body advantageously a mark is attached as a positioning aid.
  • the catchment area of the present invention extends to internal combustion engines in which fuel injection valves are used for metered injection of the fuel to be combusted.
  • Fuel injection valves form the last link of the fuel delivery chain of a fuel vehicle and thus the interface between the combustion chamber and a usually upstream rail.
  • the task of the fuel injection valve is to achieve a targeted mixing of fuel and air in a specific spatial area of the combustion chamber by atomizing the fuel.
  • the fuel in the area around the spark plug is concentrated or evenly atomized throughout the combustion chamber.
  • the fuel injection valve is electronically controlled via an electrical connection in accordance with the engine control.
  • An electrical coil in communication with the electrical connection serves to generate a magnetic field for actuating the fuel injection valve.
  • a piezoelectric actuator can be used. It lifts a valve needle against a spring pressure from the valve seat and gives a valve outlet bore LK: free and due to the pressure difference between the pressure in the fuel supply and the combustion chamber pressure of the fuel is now pressed into the combustion chamber.
  • the nozzle needle is pressed into the valve seat due to the spring force and thus interrupts the fuel flow.
  • the injected fuel quantity is dependent on the pressure in the fuel supply, the back pressure in the combustion chamber and opening time and opening cross section of the fuel injection valve at a given opening cross-section.
  • a fuel injector which consists essentially of a nozzle holder with coaxially attached thereto nozzle body for receiving a nozzle needle for the actuation of a valve disposed at the distal end of the nozzle body valve seat.
  • the attachment of the nozzle body to the nozzle holder via a clamping nut which is designed in the manner of a union nut and comes to a corresponding paragraph on the part of the nozzle body to the plant to be screwed onto the nozzle holder.
  • nozzle holder and nozzle body are braced against each other.
  • Alignment takes place at this level Technique using locating pins, which are inserted in the blind holes on the face of the nozzle holder and the nozzle body. However, high pressure tests with these fuel injectors have shown that such a pin hole significantly reduces the vibration resistance of the nozzle body.
  • From the DE 102 24 241 A1 shows a fuel injection valve, in which the above-described problem is solved in that a positioning of the nozzle body and nozzle holder takes place without a pen and thus without frontal blind holes of the adjacent components.
  • a positioning of the nozzle body and nozzle holder takes place without a pen and thus without frontal blind holes of the adjacent components.
  • realizing pinning uses this solution of an optical marking on the outside of the nozzle body.
  • the optical marking is detected manually or in the automated manufacturing process via a scanner in order then to rotate the nozzle body about its axis of symmetry until the position of the marking coincides with a predetermined desired position. Subsequently, the nozzle body is screwed by means of clamping nut to the nozzle holder.
  • a complex mounting device which is equipped with a viewing window. Through the viewing window, the marking serving as a positioning aid is visually perceptible from the outside.
  • a generic fuel injection valve is out of DE-A-2 725 707 known.
  • the invention includes the technical teaching that the clamping nut is substantially hollow cylindrical and has an internal thread on both end faces, wherein the one internal thread cooperates with a corresponding external thread on the part of the nozzle body and the other internal thread with a corresponding external thread on the nozzle holder.
  • the advantage of the solution according to the invention is, in particular, that no friction between the clamping nut and the nozzle body is created by design of the clamping nut as a double-threaded nut during clamping, which causes a moment that complicates the relative positioning of the components to be screwed together.
  • For in the solution according to the invention move when tightening the clamping nut both components to be joined together relatively to each other until they are braced together. This can be completely dispensed with pinning or similar assistance, which would result in the use of the fuel injection valve in the range of high system pressures to impermissibly high component voltages.
  • the solution according to the invention requires no additional components compared to the closest prior art and requires a relatively small space, which even allows a shortening of the nozzle body. Since the solution according to the invention requires no complicated assembly aid enclosing the nozzle body, the marking on the nozzle body for positioning aid is easily recognizable or detectable from the outside during assembly, which simplifies assembly, particularly in the case of automatic production.
  • the two internal threads formed in the clamping nut according to the invention can be designed in particular according to two preferred embodiments. So it is conceivable on the one hand to provide an internal thread of the clamping nut with a climbing direction, which is inversely to the climbing direction of the other internal thread of the clamping nut. So one internal thread can be formed as a right-hand thread and the other internal thread as a left-hand thread. However, it is also possible to form both réellegwinde either right-handed or left-hand thread, both internal threads are formed with a different thread pitch, so that when you tighten this nozzle body and nozzle holder to move towards each other, to bracing.
  • the marking can be used in addition to an optical positioning aid at the same time as an intervention for an assembly tool.
  • the marking is designed, for example, in the form of wrench flats, an assembly tool designed in the manner of an open-end wrench can be used to fix the nozzle body during screwing.
  • the mark on the nozzle body can also be formed in the form of at least one radial bore or the like. Accordingly, a fixing mandrel is to be used as the corresponding assembly tool.
  • the internal thread of the Clamping nut are designed as metric fine thread.
  • the clamping nut, the nozzle holder and the nozzle body are preferably made of steel to withstand the stresses prevailing during operation.
  • Fig. 1a shown fuel injector has an upper nozzle holder 1, to the coaxial and frontally a nozzle body 2 comes to rest.
  • the nozzle body 2 serves to receive a - only schematically illustrated - nozzle needle 3.
  • the nozzle needle 3 cooperates with a arranged at the distal end of the nozzle body 2 valve seat 4 and opens it by lifting off the valve seat 4 or closes the valve seat 4 by the force of a - not further illustrated - return spring.
  • the nozzle body 2 is releasably secured to the nozzle holder 1 via a clamping nut 5.
  • the clamping nut 5 is formed in a hollow cylindrical shape and has a thread 6a and 6b on both end faces.
  • the one internal thread 6a cooperates with a corresponding external thread on the nozzle body 2.
  • the other internal thread 6b engages with a corresponding external thread on the nozzle holder 1.
  • the internal thread 6a of the clamping nut 5 has a reverse rising direction relative to the internal thread 6b, so that the coaxial with each other to be joined components - nozzle holder 1 and nozzle body 2 - to move towards each other upon rotation of the clamping nut 5.
  • Both internal threads 6a and 6b of the clamping nut 5 are designed as symmetrical fine thread.
  • the nozzle body 2 is further equipped with a marking as a positioning aid during assembly, which is arranged directly adjacent to the nozzle retaining nut.
  • this mark is here in the form of key surfaces 7a to 7c.
  • the key surfaces 7a to 7c are in addition to the optical positioning aid for engagement for a - not shown - - suitable mounting tool.
  • Fig. 2a illustrated embodiment differs from the embodiment described above in that the internal threads 6a 'and 6b' of the clamping nut 5 'have the same pitch direction, but with different thread pitch. This measure also ensures a frictionless clamping of the components to be connected, ie the nozzle holder 1 and the nozzle body 2 '.
  • the nozzle body 2 also has a mark arranged in section BB.
  • this marking on the nozzle body 2 ' is formed in this embodiment as a radial base hole 8, which also serves as an optical positioning aid for engagement with a mounting tool.
  • the marking serving as a positioning aid and engagement point for a mounting tool outside of the nozzle body 2 and 2 'in other suitable form - for example, as a hexagon, as knurling or as a toothing - be formed.

Landscapes

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

Claims (9)

  1. Soupape d'injection de carburant pour un moteur à combustion interne comprenant un corps de buse (2, 2') maintenu sur un porte-buse (1) au moyen d'un écrou (5, 5'), une aiguille de buse (3) étant disposée dans le corps de buse (2, 2'), laquelle coopère avec un siège de soupape (4) réalisé dans le corps de buse (2, 2') pour la commande d'une injection de carburant, l'écrou (5, 5') étant réalisé sous forme essentiellement cylindrique creuse et présentant sur les deux côtés frontaux à chaque fois un filetage interne (6a, 6b), l'un des filetages internes (6a) coopérant avec un filetage externe correspondant sur le corps de buse (2, 2') et l'autre filetage interne (6b) coopérant avec un filetage externe correspondant sur le porte-buse (1), caractérisée en ce que les deux filetages internes (6a, 6b) de l'écrou (5, 5') et les filetages externes sur le corps de buse (2, 2') et le porte-buse (1) coopèrent de telle sorte que lors de la rotation de l'écrou (5, 5'), le corps de buse (2, 2') et le porte-buse (1) puissent se déplacer l'un vers l'autre et ainsi être serrés l'un contre l'autre.
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que l'on réalise sur le corps de buse (2, 2') un marquage servant d'aide au positionnement.
  3. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que l'un des filetages internes (6a) de l'écrou (5) présente une direction de pas inverse de celle de l'autre filetage interne (6b) de l'écrou (5).
  4. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que les deux filetages internes (6a', 6b') de l'écrou (5') présentent la même direction de pas, mais avec un pas de filetage différent.
  5. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que le corps de buse (2, 2') présente, directement à côté de l'écrou (5, 5'), un marquage accessible et visible depuis l'extérieur servant d'aide au positionnement lors du montage.
  6. Soupape d'injection de carburant selon la revendication 5, caractérisée en ce que le marquage sur le corps de buse (2) est réalisé sous forme de surfaces de clé (7a-7c), afin de servir de prise pour un outil de montage.
  7. Soupape d'injection de carburant selon la revendication 5, caractérisée en ce que le marquage sur le corps de buse (2') est réalisé sous forme d'au moins un alésage de base radial (8) afin de servir également de prise pour un outil de montage.
  8. Soupape d'injection selon l'une quelconque des revendications précédentes, caractérisée en ce que les filetages internes (6a, 6b ; 6a', 6b') de l'écrou (5, 5') sont réalisés sous forme de filetages fins métriques.
  9. Soupape d'injection selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins les composants du porte-buse (1), du corps de buse (2) et de l'écrou (5) se composent d'un alliage d'acier.
EP06120585A 2005-10-17 2006-09-13 Soupape d'injection de carburant Not-in-force EP1775460B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005049540A DE102005049540A1 (de) 2005-10-17 2005-10-17 Kraftstoffeinspritzventil mit einer Markierung als Positionierhilfe

Publications (2)

Publication Number Publication Date
EP1775460A1 EP1775460A1 (fr) 2007-04-18
EP1775460B1 true EP1775460B1 (fr) 2009-01-14

Family

ID=37421028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06120585A Not-in-force EP1775460B1 (fr) 2005-10-17 2006-09-13 Soupape d'injection de carburant

Country Status (3)

Country Link
EP (1) EP1775460B1 (fr)
AT (1) ATE421038T1 (fr)
DE (2) DE102005049540A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007051550A1 (de) * 2007-10-29 2009-04-30 Robert Bosch Gmbh Stößel für ein Magnetventil und ein Verfahren zur Kennzeichnung von Stößeln für Magnetventile
DE102011076957A1 (de) * 2011-06-06 2012-12-06 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102011077266B4 (de) * 2011-06-09 2014-08-28 Continental Automotive Gmbh Injektor
DE102012211009A1 (de) 2012-06-27 2014-01-02 Robert Bosch Gmbh Kraftstoffinjektor für eine Verbrennungskraftmaschine
DE102014212353A1 (de) 2014-06-26 2015-12-31 Robert Bosch Gmbh Kraftstoffinjektor und dessen Verwendung sowie Verfahren zum Herstellen eines Kraftstoffinjektors
DE102014221860A1 (de) 2014-10-27 2016-04-28 Robert Bosch Gmbh Kraftstoffeinspritzventil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2725707C2 (de) * 1977-06-07 1986-05-15 Münchner Motor-Zubehör GmbH, 8000 München Wassergekühlte Kraftstoffeinspritzdüse für Brennkraftmaschinen
GB2080414B (en) * 1980-07-18 1984-03-07 Lucas Industries Ltd Ic engine fuel injection nozzle
GB9725805D0 (en) * 1997-12-06 1998-02-04 Lucas Ind Plc Fuel injector nozzle
DE10224241A1 (de) * 2001-06-13 2003-03-06 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Also Published As

Publication number Publication date
ATE421038T1 (de) 2009-01-15
EP1775460A1 (fr) 2007-04-18
DE502006002638D1 (de) 2009-03-05
DE102005049540A1 (de) 2007-04-19

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