EP2532877B1 - Soupape d'injection de carburant pour moteurs à combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP2532877B1
EP2532877B1 EP12169087.9A EP12169087A EP2532877B1 EP 2532877 B1 EP2532877 B1 EP 2532877B1 EP 12169087 A EP12169087 A EP 12169087A EP 2532877 B1 EP2532877 B1 EP 2532877B1
Authority
EP
European Patent Office
Prior art keywords
clamping nut
region
holding body
fuel injection
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.)
Active
Application number
EP12169087.9A
Other languages
German (de)
English (en)
Other versions
EP2532877A1 (fr
Inventor
Dietmar Uhlmann
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2532877A1 publication Critical patent/EP2532877A1/fr
Application granted granted Critical
Publication of EP2532877B1 publication Critical patent/EP2532877B1/fr
Active 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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 invention relates to a fuel injection valve for internal combustion engines according to the preamble of claim 1, such as in EP 1 775 460 shown.
  • Such a fuel injection valve is also from the DE 10 2008 001 330 A1 the applicant known. It comprises substantially on the combustion chamber of the internal combustion engine side facing a housed in a housing nozzle body in which a nozzle needle is guided up and down movable.
  • the nozzle needle is at least indirectly axially braced together with the nozzle body by means of a clamping nut against a holding body arranged in the housing.
  • the clamping nut has an internal thread as part of a threaded connection, which cooperates with a corresponding external thread on the holding body and in particular also forms a seal of the housing arranged in the region of the nozzle body fuel, which is meant when operating fuel injection valve under relatively high pressure, here a pressure of more than 1500bar, stands.
  • the present invention seeks to further develop a fuel injection valve for internal combustion engines according to the preamble of claim 1 such that the threaded connection, which connects the clamping nut with the holding body and a seal of the housing after forms on the outside, so educate, that it is particularly dense, especially at relatively high fuel pressures.
  • the invention is based on the idea of designing the threaded connection in such a way that at least two toothing regions with different thread dimensions are present which follow one another axially in the longitudinal direction of the housing. This makes it possible to optimize the respective toothed areas with regard to their specific properties or tasks. In particular, this makes it possible, for example, optimally form a first toothed area with respect to its tightness, while a second toothed area is optimized with respect to the relatively simple mounting of the clamping nut.
  • a thread-free intermediate section is formed between the two toothed regions.
  • This unthreaded intermediate section makes it possible, in particular, to manufacture the two toothing regions on the clamping nut or on the holding body relatively simply in terms of production technology.
  • the axial length of the unthreaded intermediate region corresponds to the axial length of a first toothed region on the clamping nut, which is arranged on the side of the clamping nut facing the holding body.
  • the second toothed region on the side of the clamping nut facing the nozzle body have the smaller thread diameter and a double number of teeth than the first toothed region.
  • the wall thickness of the clamping nut in the second toothed region is greater than in the first toothed region. Due to the increased wall thickness of the clamping nut, the occurring compressive stresses can be absorbed particularly well, or a widening of the clamping nut due to the hydraulic pressure compared to the prior art is reduced, which increases the tightness of the second toothed region.
  • Fig. 1 is a section of a fuel injection valve 100 according to the invention shown, as it is used for injecting fuel in a combustion chamber of an internal combustion engine, not shown, in particular a self-igniting internal combustion engine.
  • the fuel injection valve 100 is part of a so-called common-rail injection system, in which each cylinder of the internal combustion engine, a separate, supplied by a common rail with fuel fuel injection valve 100 is assigned.
  • the injection pressure of the fuel injection valve 100 is preferably more than 1500 bar.
  • the fuel injection valve 100 has a housing 10, which is shown only in regions, in which, inter alia, an injection valve member (not shown), in particular in the form of a nozzle needle, is arranged to be movable up and down.
  • a nozzle body 11 is arranged, which simultaneously forms the combustion chamber of the internal combustion engine facing the end of the fuel injection valve 100.
  • the nozzle body 11 has a step 12 on its outer periphery.
  • a throttle plate 13 is arranged, as well as on the nozzle body 11 side facing the throttle plate 13, a valve plate 14.
  • a holding body 15 of the housing 10 against which the nozzle body eleventh , the throttle plate 13 and the valve plate 14 are axially braced.
  • the axial clamping of the addressed components of the fuel injection valve 100 by means of a clamping nut 18, which has at its end facing the nozzle body 11 at its inner wall a diameter stage 19 which rests flush against the step 12 of the nozzle body 11.
  • the Fig. 1 is formed between the holding body 15 and the clamping nut 18, a threaded connection 20.
  • the threaded connection 20 has a first toothed region 21 on the side facing away from the nozzle body 11 and a second toothed region 22 on the side facing the nozzle body 11.
  • a first toothed region 21 on the side facing away from the nozzle body 11
  • a second toothed region 22 on the side facing the nozzle body 11.
  • the intermediate region 23 is formed in the region of the holding body 15 as a cylindrical portion 17 with a continuous same outer diameter.
  • two sections 24, 25 are formed, each of which is cylindrical, wherein the section 24 facing the first gear section 21 has a larger inner diameter than that of the second gear section 22 facing portion 25.
  • the two portions 24, 25 in about the same length, z. B. each about 2mm, formed.
  • the second toothed region 22 is located near the lower end face 26 of the holding body 15 in the region of the holding body 15 on the side facing the valve plate 14.
  • FIG. 2 to 4 different phases of the assembly process of the clamping nut 18 are shown on the holding body 15.
  • the state is shown in which the first toothed region 21 of the clamping nut 18 is located in the region of the second toothed region 22 of the holding body 15.
  • a gap 27 is formed between the teeth of the second toothed region 22 of the holding body 15.
  • the state is shown in which the first toothed region 21 of the clamping nut 18 in the region of the first toothed region 21 of the holding body 15 arrived. It is essential that at the beginning of the engagement of the thread of the first toothed portion 21 of the clamping nut 18 in the first gear portion of the holding body 15, the output of the winding of the first toothed portion 21 of the clamping nut 18 is still in abutting contact with the second toothed portion 22 of the holding body 15. As a result, the first toothed region 21 of the clamping nut 18 is always in engagement with one of the two toothed regions 21, 22 of the holding body 15, so that slippage or falling through of the clamping nut 18 during assembly on the holding body 15 is avoided.

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

Claims (8)

  1. Soupape d'injection de carburant (100) pour moteurs à combustion interne, avec un carter (10) dans lequel un corps de buse (11) est serré au moins de façon indirecte dans le plan axial contre un corps d'arrêt (15) au moyen d'un écrou de serrage (18), l'écrou de serrage (18) comprenant le corps de buse (11) dans le plan radial et une liaison filetée (20) étant réalisée entre le corps d'arrêt (15) et l'écrou de serrage (18), entre l'écrou de serrage (18) et le corps d'arrêt (15), dans la zone située à une certaine distance axiale du corps de buse (11), caractérisée en ce que la liaison filetée (20) comprend au moins deux zones d'endentement (21, 22) avec différentes dimensions de filet disposées l'une derrière l'autre dans le plan axial dans la direction longitudinale du carter (10) et que les dimensions de filet se distinguent dans les diamètres de filet et le nombre de dents et que les pentes des zones d'endentement (21, 22) sont de même taille.
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce qu'une zone intermédiaire (23) exempte de filet est réalisée entre les deux zones d'endentement (21, 22).
  3. Soupape d'injection de carburant selon la revendication 1 ou 2, caractérisée en ce que la longueur (LZB) axiale de la zone intermédiaire (23) exempte de filet située au niveau du corps d'arrêt (15) correspond à la longueur (L1) axiale d'une première zone d'endentement (21) située au niveau de l'écrou de serrage (18) et disposée sur le côté de l'écrou de serrage (18) orienté vers le corps d'arrêt (15).
  4. Soupape d'injection de carburant selon la revendication 3, caractérisée en ce qu'une deuxième zone d'endentement (22) comporte sur le côté orienté vers le corps de buse (11), au niveau du corps d'arrêt (15) et au niveau de l'écrou de serrage (18), le plus petit diamètre de filet et un nombre de dents doublé, comme la première zone d'endentement (21).
  5. Soupape d'injection de carburant selon la revendication 4, caractérisée en ce que l'épaisseur de paroi (A) de l'écrou de serrage (18) est supérieure dans la deuxième zone d'endentement (22) à l'épaisseur de paroi (a) prévue dans la première zone d'endentement (21).
  6. Soupape d'injection de carburant selon l'une quelconque des revendications 1, 3, 4 ou 5, caractérisée en ce que la première zone d'endentement (21) est réalisée au niveau du corps d'arrêt (15) sous la forme du filet extérieur avec le dimensionnement M17 x 0,75 mm et la deuxième zone d'endentement (22) est réalisée au niveau du corps d'arrêt (15) sous la forme du filet extérieur avec le dimensionnement M16 x 0,75 mm.
  7. Soupape d'injection de carburant selon l'une quelconque des revendications 3 à 6, caractérisée en ce que dans la position d'extrémité vissée, l'écrou de serrage (18) de la deuxième zone d'endentement (22) est recouvert au niveau du corps d'arrêt (15) au moins presque entièrement depuis la deuxième zone d'endentement (22) de l'écrou de serrage (18).
  8. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 7, caractérisée en ce que d'autres composants, notamment une plaque d'étranglement (13) et une plaque de soupape (14), sont disposés dans le carter (10), entre le corps d'arrêt (15) et le corps de buse (11).
EP12169087.9A 2011-06-06 2012-05-23 Soupape d'injection de carburant pour moteurs à combustion interne Active EP2532877B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110076957 DE102011076957A1 (de) 2011-06-06 2011-06-06 Kraftstoffeinspritzventil für Brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP2532877A1 EP2532877A1 (fr) 2012-12-12
EP2532877B1 true EP2532877B1 (fr) 2015-07-29

Family

ID=46168230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12169087.9A Active EP2532877B1 (fr) 2011-06-06 2012-05-23 Soupape d'injection de carburant pour moteurs à combustion interne

Country Status (3)

Country Link
US (1) US8833735B2 (fr)
EP (1) EP2532877B1 (fr)
DE (1) DE102011076957A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012208075A1 (de) * 2012-05-15 2013-11-21 Man Diesel & Turbo Se Injektor für eine Kraftstoffversorgungsanlage einer Brennkraftmaschine sowie Kraftstoffversorgungsanlage
JP6406118B2 (ja) * 2015-05-07 2018-10-17 株式会社デンソー 燃料噴射装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10044933A1 (de) * 2000-09-12 2002-03-21 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP3928362B2 (ja) * 2001-02-14 2007-06-13 株式会社デンソー 流体移送装置のシール面圧向上構造
DE10121531A1 (de) * 2001-05-03 2002-11-14 Siemens Ag Kraftstoffinjektor
DE10133167A1 (de) * 2001-07-07 2003-01-23 Bosch Gmbh Robert Kraftstoffhochdruckvorrichtung
DE10155413A1 (de) * 2001-11-10 2003-05-22 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE10250720A1 (de) * 2002-10-31 2004-05-13 Robert Bosch Gmbh Einspritzventil
DE102005020833A1 (de) * 2005-05-04 2006-11-09 Robert Bosch Gmbh Kraftstoffeinspritzmodul
DE102005049540A1 (de) * 2005-10-17 2007-04-19 Robert Bosch Gmbh Kraftstoffeinspritzventil mit einer Markierung als Positionierhilfe
DE102008001330A1 (de) 2008-04-23 2009-10-29 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Also Published As

Publication number Publication date
EP2532877A1 (fr) 2012-12-12
US8833735B2 (en) 2014-09-16
US20120305823A1 (en) 2012-12-06
DE102011076957A1 (de) 2012-12-06

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