WO2011042296A1 - Soupape d'injection de carburant et sa fabrication - Google Patents

Soupape d'injection de carburant et sa fabrication Download PDF

Info

Publication number
WO2011042296A1
WO2011042296A1 PCT/EP2010/063876 EP2010063876W WO2011042296A1 WO 2011042296 A1 WO2011042296 A1 WO 2011042296A1 EP 2010063876 W EP2010063876 W EP 2010063876W WO 2011042296 A1 WO2011042296 A1 WO 2011042296A1
Authority
WO
WIPO (PCT)
Prior art keywords
injector
throttle
fuel
fuel injection
injection valve
Prior art date
Application number
PCT/EP2010/063876
Other languages
German (de)
English (en)
Inventor
Matthias Horn
Andreas Rettich
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 WO2011042296A1 publication Critical patent/WO2011042296A1/fr

Links

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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • Such a fuel injection valve is known from EP 0 971 1 18 A2.
  • the injector element is comprised by an annular throttle element in a lower region of a high-pressure reservoir so that an annular feed gap is formed between the throttle element and the injector housing surrounding the throttle element in the high-pressure reservoir, which influences the movement of the injector element.
  • this throttle element referred to as a so-called closing throttle, to ensure that the pressure force which is transmitted to the injection nozzle element via a valve piston is greater when the fuel outlet channels are closed than the pressure force acting on the injection nozzle element in the opening direction.
  • by means of such a design of the fuel injection valve can be achieved in practice very high pressures of the fuel injection valve, which still allows a safe and fast switching.
  • the invention is based on Aufge ⁇ be, a fuel injection valve according to the preamble of the claim
  • the invention is based on the idea of producing the throttle element as a separate component with customary manufacturing tolerances and to pair the throttle element produced thereby with an injector body whose bore for receiving the throttle element has also been manufactured with customary manufacturing tolerances. In this case, a specific selection of a particular throttle element or a special injector housing ensures that the required flow cross section is maintained at the throttle element despite the relatively inexpensive production.
  • Compression spring is formed. This can be saved on the one hand by the disk-shaped design space, on the other hand, the throttle element takes over an additional function at the same time.
  • the geometry of the flow cross-section can be adjusted by the throttle element has a circular in cross section outer circumference, so that between the injector and the throttle element an annular inlet gap is formed.
  • the throttle element has a circular cross-section outer circumference with at least one flat, so that between the injector and the throttle element at least one gap-shaped inlet gap is formed.
  • the advantage of the latter solution lies in the fact that such a flattening can be made relatively easily, wherein it is less critical with respect to the geometry to achieve a certain flow cross-section, as in a solution in which the throttle element has a circular outer periphery.
  • the throttle element is disposed on a the at least one fuel outlet channel facing end portion of the injector element near a guide for the injector element. Due to the relatively close distance between the guide for the injection nozzle Senelement and the throttle element can thus minimize a occurring due to manufacturing tolerances tilting or radial deviation of the throttle element in its bore.
  • a method according to the invention for producing a fuel injection valve it is provided to manufacture the injector housing separately with its respective receiving bore for the throttle element and the throttle element. Subsequently, due to the actual dimensions of the bore and of the throttle element, pairings can be put together in which a desired or required flow cross section at the throttle element adjusts very precisely, which allows a particularly economical production of the fuel injection valves.
  • FIG. 1 shows a longitudinal section through a lower part of a fuel injection valve according to the invention, as used in particular in common rail systems,
  • FIG. 2 shows a cross section through the fuel injection valve of FIG. 1 in the region of its throttle element
  • Fig. 3 is a comparison with FIG. 2 modified throttle element, also in
  • a fuel injection valve 10 is shown in Fig. 1, the lower part of a fuel injection valve 10 is shown.
  • the fuel injection valve 10 is part of a fuel injection system, not otherwise shown, in particular a so-called “common rail system", as used in diesel internal combustion engines to inject fuel into the combustion chambers of the internal combustion engine.
  • each cylinder of the internal combustion engine is associated with a single fuel injection valve 10, which injects the fuel under high pressure, for example up to about 2200 bar, in the corresponding combustion chamber.
  • the fuel injection valve 10 has an elongate injector housing 1 1, which has a centrally arranged recess 12 at least in its lower region.
  • the recess 12 is stepped in diameter several times, and forms a high-pressure accumulator chamber 14, in the high-pressure fuel, which is introduced via a so-called rail in a corresponding supply line into the injector 1 1 is.
  • the injector housing 1 1 furthermore preferably has a plurality of fuel outlet openings 16, 17, which can be closed by means of a pin-shaped or needle-shaped injection nozzle element 18, which is also referred to as a "nozzle needle.”
  • the injection nozzle element 18 has its The fuel outlet openings 16, 17 facing the end, for example, a conical tip 19, which together with a corresponding conically shaped portion 20 of the recess 12 form a sealing seat 21 when the tip 19 abuts the portion 20.
  • the injector element 18 is guided up and down in the injector housing 1 1, for which purpose a guide 22 is formed on the injector element 18 at its lower end.
  • the guide 22 is realized, for example, by a ground triple flat on the injection nozzle member 18, which with a
  • Bore portion 23 cooperates in the recess 12.
  • the triflax makes it possible for fuel to be able to flow around the region of the guide 22, so that a connection is formed between the high-pressure reservoir 14 and the region of the fuel outlets 16, 17.
  • the injector element 18 can be moved up and down by means of a per se known, and therefore not shown, mechanism, for example via a solenoid valve or a piezo, whereby the fuel outlet openings 16 and 17 can be released in a desired manner to inject the fuel into the combustion chamber ,
  • the injector element 18 is subjected to a force acting as a closing spring compression spring 25 in the direction of the fuel outlet openings 16, 17.
  • the compression spring 25 is supported, for example, between a step 26 formed in the injector housing 11 and a piston Spring plate 27 from which is axially fixed to the injector element 18 is connected.
  • the spring plate 27 is preferably arranged close to the guide 22 in the lower end region of the injection nozzle element 18.
  • the spring plate 27 is substantially disc-shaped and has a hub portion 28 which includes the injector member 18 with little or no radial play.
  • On the compression spring 25 opposite side of the spring plate 27 of the spring plate 27 is located on a step 29 of an enlarged diameter portion of the injector 18, so that the compression spring 25 presses the spring plate 27 in the direction of paragraph 29 when the spring plate 27 with radial play the Injector element 18 surrounds, and thus axially fixes the spring plate 27 to the injector element 18.
  • the spring plate 27 is pressed onto the injector element 18, so that it may be possible to dispense with the step 29.
  • the spring plate 27 acts simultaneously as a throttle element 30.
  • a defined inlet gap 33 is formed between the bore portion 32 of the recess 12 in which the spring plate 27 is located and the outer periphery of the spring plate 27, a defined inlet gap 33 is formed.
  • the spring plate 27 has a circular shape or a circular outer circumference 34, so that an annular feed gap 33 results. Since the desired throttling action is very sensitive to a change in the size of the flow cross-section at the inlet gap 33, it is necessary that the
  • both the bore portion 32 in the Injektorgepatuse 1 1 and the outer circumference 34 of the spring plate 27 is manufactured by conventional manufacturing methods , which certain, even relatively large manufacturing tolerances of the bore portion 32 and the outer circumference 34 may result.
  • the modified throttle element 30a shown in FIG. 3 this has, in the exemplary embodiment, two flattened portions 36 and 37 which are offset by 180 degrees relative to one another.
  • two gap-shaped inlet gaps 38, 39 are formed between the bore portion 32 and the outer periphery 34a of the throttle element 30a, wherein in the circular portions of the outer periphery 34a, the throttle element 30a has only a small radial distance from the bore portion 32.
  • the flow cross section at the throttle element 30a can be adjusted very precisely via the inlet gaps 38, 39 if the actual geometry of the throttle elements 30a is detected and combined with corresponding bore sections 32 or injector housings 11 ,

Abstract

L'invention concerne une soupape d'injection de carburant (10), comprenant un boîtier d'injecteur (11), dans lequel un élément de buse d'injection (18) en forme de goupille, qui libère ou ferme au moins indirectement au moins un canal de sortie de carburant (16, 17) dans le boîtier d'injecteur (11), est guidé de façon glissante, l'élément de buse d'injection (18) étant sollicité en force au moyen d'un ressort de pression (25), qui s'appuie entre l'élément de buse d'injection (18) et un élément fixe (26) en direction du au moins un canal de sortie de carburant (16, 17), et un espace accumulateur de haute pression (14) étant formé entre l'élément de buse d'injection (18) et le boîtier d'injecteur (11), lequel espace est en liaison active avec le au moins un canal de sortie de carburant (16, 17) et est disposé dans l'élément étrangleur (30 ; 30a) relié à l'élément de buse d'injection (18), lequel élément limite la section d'écoulement pour le carburant dans l'espace accumulateur de haute pression (14). Selon l'invention, il est prévu que l'élément étrangleur (30 ; 30a) est conçu sous forme de composant séparé et est sélectionné en fonction d'un diamètre d'alésage (32), délimitant l'espace accumulateur de haute pression (14), du boîtier d'injecteur (11) pour obtenir une section d'écoulement définie.
PCT/EP2010/063876 2009-10-06 2010-09-21 Soupape d'injection de carburant et sa fabrication WO2011042296A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009045348.2 2009-10-06
DE200910045348 DE102009045348A1 (de) 2009-10-06 2009-10-06 Kraftstoffeinspritzventil und dessen Herstellung

Publications (1)

Publication Number Publication Date
WO2011042296A1 true WO2011042296A1 (fr) 2011-04-14

Family

ID=43072815

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/063876 WO2011042296A1 (fr) 2009-10-06 2010-09-21 Soupape d'injection de carburant et sa fabrication

Country Status (2)

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DE (1) DE102009045348A1 (fr)
WO (1) WO2011042296A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014526632A (ja) * 2011-09-08 2014-10-06 デルファイ・インターナショナル・オペレーションズ・ルクセンブルク・エス・アー・エール・エル 噴射ノズル

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013212330A1 (de) * 2013-06-26 2014-12-31 Continental Automotive Gmbh Verfahren zum Herstellen von Injektoren, insbesondere Kraftstoffinjektoren, sowie Injektor
GB201322485D0 (en) * 2013-12-19 2014-02-05 Delphi Tech Holding Sarl Fuel injection nozzle
GB201421885D0 (en) * 2014-12-09 2015-01-21 Delphi International Operations Luxembourg S.�.R.L. Fuel injector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3834446A1 (de) * 1988-10-10 1990-04-12 Mesenich Gerhard Elektromagnetisches einspritzventil in patronenbauweise
EP0971118A2 (fr) * 1998-07-06 2000-01-12 Isuzu Motors Limited Injecteur de carburant
DE102004002309A1 (de) * 2004-01-16 2005-08-04 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Nadelstreuerung
WO2009141182A1 (fr) * 2008-05-21 2009-11-26 Robert Bosch Gmbh Injecteur de carburant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3834446A1 (de) * 1988-10-10 1990-04-12 Mesenich Gerhard Elektromagnetisches einspritzventil in patronenbauweise
EP0971118A2 (fr) * 1998-07-06 2000-01-12 Isuzu Motors Limited Injecteur de carburant
DE102004002309A1 (de) * 2004-01-16 2005-08-04 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Nadelstreuerung
WO2009141182A1 (fr) * 2008-05-21 2009-11-26 Robert Bosch Gmbh Injecteur de carburant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014526632A (ja) * 2011-09-08 2014-10-06 デルファイ・インターナショナル・オペレーションズ・ルクセンブルク・エス・アー・エール・エル 噴射ノズル

Also Published As

Publication number Publication date
DE102009045348A1 (de) 2011-04-07

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