EP2440769B1 - Soupape d'injection avec un ensemble de transmission - Google Patents

Soupape d'injection avec un ensemble de transmission Download PDF

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Publication number
EP2440769B1
EP2440769B1 EP10721180.7A EP10721180A EP2440769B1 EP 2440769 B1 EP2440769 B1 EP 2440769B1 EP 10721180 A EP10721180 A EP 10721180A EP 2440769 B1 EP2440769 B1 EP 2440769B1
Authority
EP
European Patent Office
Prior art keywords
pot
piston
injection valve
nozzle needle
chamber
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
EP10721180.7A
Other languages
German (de)
English (en)
Other versions
EP2440769A1 (fr
Inventor
Sven Jaime Salcedo
Michael Knoller
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
Publication of EP2440769A1 publication Critical patent/EP2440769A1/fr
Application granted granted Critical
Publication of EP2440769B1 publication Critical patent/EP2440769B1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions

Definitions

  • the invention relates to an injection valve with a transmission unit according to claim 1.
  • the object of the invention is to provide an improved transmission unit for an injection valve.
  • the object of the invention is achieved by the injection valve according to claim 1.
  • the injection valve described has the advantage that the transmission unit has an improved structure.
  • the transfer unit has two movable pistons, wherein a movable pot is arranged between the two pistons, wherein the movable pot is guided in a further fixed pot, wherein the first piston is guided through an opening in the bottom of the further pot with a third sealing gap wherein the second piston is guided in a sleeve-shaped portion of the pot with a fifth sealing gap, wherein between the further pot and the pot, a first chamber is formed, wherein between the pot and the second piston, a second chamber is formed, wherein the two chambers are connected to each other via at least one channel and wherein a piston with the nozzle needle and the other piston is in operative connection with the actuator.
  • a transmission unit is provided, which reliably enables a transmission of the deflection of the actuator on the nozzle needle.
  • a spring element is clamped between the nozzle needle and the movable pot, which biases the movable pot in the direction of the first piston. This allows a bias of the nozzle needle in the direction of a sealing seat.
  • the first piston rests on an outer side of the bottom of the movable pot. This will set an idle stroke precisely.
  • two channels are provided, which connect the two chambers with each other, wherein the two channels are inserted in the bottom of the movable pot. Due to the formation of two channels, a quick pressure equalization between the two chambers is possible.
  • the second piston limits the second chamber in a second end face, wherein the further pot with a second annular surface which surrounds the first piston delimits the first chamber.
  • the second end face of the second piston is preferably formed smaller than the second annular surface of the other pot.
  • FIG. 1 shows in a schematic representation of an injection valve 1, which has a housing 2, at the lower end of a nozzle body 3 by means of a clamping nut 4 is fixed.
  • a nozzle needle 5 is movably mounted in the longitudinal direction.
  • the nozzle needle 5 is connected via a transmission unit 40 with an actuator 7 in operative connection.
  • a fuel chamber 8 is formed between the nozzle needle 5 and the nozzle body 3, which is supplied via channels, not shown, with fuel, for example via a fuel reservoir and / or a fuel pump.
  • an annular sealing seat 10 is formed on the inside of the nozzle body 3.
  • the sealing seat 10 is associated with an annular peripheral sealing surface 11 at the lower end of the nozzle needle 5. Depending on the position of the nozzle needle, which is adjusted by the actuation of the actuator 7, the nozzle needle 5 lifts off from the sealing seat 10 and releases a hydraulic connection between the fuel chamber 8 and the injection holes 9.
  • the actuator 7 may be formed, for example, as a piezoelectric actuator or as a magnetic actuator. By an electrical energization of the actuator 7, the actuator 7 extends and thus acts on the transmission unit 40 a.
  • the transmission unit 40 is formed in such a way that the deflection of the actuator 7 is transmitted to the nozzle needle 5.
  • FIG. 2 shows an enlarged view of the transfer unit 40.
  • the transfer unit 40 projects a cylindrical first piston 12 through an opening 15 of a bottom 13 of a pot 14.
  • the pot 14 is connected via an annular disk-shaped peripheral edge portion 41 fixed to the housing 2.
  • bores 6 are introduced, can flow through the fuel from an upper interior of the injection valve to a lower interior of the injection valve.
  • a second sleeve-shaped pot 42 is arranged, which is movably mounted in a sleeve-shaped portion of the pot 14.
  • a cylindrical end piece 17 of the nozzle needle 5 is guided.
  • the end piece 17 represents a piston.
  • the first piston 12 rests with the end face 28 on an upper side of a second bottom 43 of the second pot 42. In the second bottom 43 two channels 44, 45 are introduced. Between the first and the second pot 14, 42 and the first piston 12, a first chamber 46 is formed. Between the second pot 42 and the end piece 17, a second chamber 47 is formed.
  • the first pot 14 defines, with a second annular surface 52 formed on an inner side of the bottom 13, the first chamber 46.
  • the end piece 17 defines with a second end surface 53 the second chamber 47.
  • the second end surface 53 is smaller than the second Ring surface 52.
  • the second end face 53 is half as large as the second annular surface.
  • the area ratio between the second end surface 53 and the second annular surface defines a translation between the deflection of the actuator and the deflection of the nozzle needle.
  • a third spring element 48 is tensioned.
  • the first and the second channel 44, 45 connect the first and the second chamber 46, 47.
  • the first piston 12 is sealingly guided in the bottom 13 via a third sealing gap 49.
  • the second pot 42 is sealingly guided over a fourth sealing gap 50 in a sleeve-shaped portion of the fixed pot 14.
  • the end piece 17 is sealingly guided over a fifth sealing gap 51 in the sleeve-shaped portion of the second pot 42.
  • the third, fourth and fifth sealing gaps 49, 50, 51 may preferably have a width of 2 to 20 ⁇ m, in particular in the range of 8 ⁇ m.
  • the third, fourth and fifth sealing gaps 49, 50, 51 are dimensioned such that the first and second chambers, which are filled with fuel, are sealed against the interior of the injection valve during a brief pressurization, which occurs during injection operations.
  • the third, fourth and fifth sealing gaps 49, 50, 51 ensure that the first and second chambers 46, 47 are always filled with fuel and that there are pressure differences that are present over extended periods, i. longer than injection operations are available, compensate.
  • the transmission unit 40 functions as follows: in the non-activated state of the actuator 7, the nozzle needle 5 is seated with the sealing surface 11 on the sealing seat 10, so that there is no connection between the fuel chamber 8 and the injection holes 9. Thus, no fuel is injected. In this case, the actuator 7 abuts against the first piston 12. The first piston 12 abuts against the second bottom 43 of the second movable pot 42 and thus presses the nozzle needle 5 into the sealing seat via the third spring element 48. The first and second chambers 46, 47 are completely filled with fuel, and the housing 2 is also filled with fuel in the area of the transfer unit 40.
  • the actuator 7 is energized, so that the actuator moves downward in the direction of the transmission unit 40.
  • the actuator 7 is supported in the upper region against the housing 2 of the injection valve.
  • the first piston 12 is pushed down.
  • the first piston 12 pushes the second pot 42 down.
  • the pressure in the second chamber 47 is increased, so that fuel from the second chamber 47 via the first and the second channel 44, 45 flows into the first chamber 46.
  • the pressure in the second chamber 47 decreases, so that the nozzle needle 5 moves upward and lifts off from the sealing seat 10. Consequently, the injection starts.
  • the actuator 7 is activated in such a way that it shortens. As a result, the force on the first piston 12 and thus also on the second pot 42 decreases. Consequently, the pressure in the second chamber 47 drops.
  • the third spring element 48 causes the nozzle needle 5 to be pulled out of the second sleeve 42. Consequently, fuel flows back from the first chamber into the second chamber and the nozzle needle 5 is pressed down onto the sealing seat.
  • FIG. 3 shows a schematic representation of the nozzle body 3 with the end piece 17 of the nozzle needle 5 and the third spring element 48, which rests on a gradation of the nozzle needle 5.
  • FIG. 4 shows a cross section through the second sleeve 42, which is pushed onto the end piece 17 of the nozzle needle. Subsequently, the sleeve 14 is pushed over the second sleeve 42, as in FIG. 5 is shown. Then, the piston 12 is inserted through the opening of the bottom 13, as in FIG. 6 is shown. Then, the actuator 7 is mounted in the housing and the assembly as in FIG. 1 shown clamped on the clamping nut 4 with the housing 2. The upper and lower inner spaces 18, 19 of the injection valve 1 are filled with fuel.

Landscapes

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

Claims (6)

  1. Soupape d'injection (1) pour l'injection de carburant dans un moteur à combustion interne, avec un actionneur (7), avec un pointeau (5), qui est associé à un siège d'étanchéité (10), dans laquelle il est prévu une unité de transmission (40), qui représente une liaison active entre l'actionneur (7) et le pointeau (5), caractérisée en ce que l'unité de transmission (40) présente deux pistons mobiles (12, 17), dans laquelle un godet mobile (42) est disposé entre les deux pistons (12, 17), dans laquelle le godet mobile (42) est guidé par une quatrième fente d'étanchéité (50) dans une partie en forme de douille d'un autre godet immobile (14), dans laquelle le premier piston (12) est guidé à travers une ouverture (15) du fond (13) de l'autre godet (14) par une troisième fente d'étanchéité (49), dans laquelle le deuxième piston (17) pénètre dans une partie en forme de douille du godet (42) avec une cinquième fente d'étanchéité (51), dans laquelle une première chambre (46) est formée entre l'autre godet (42) et le godet (14), dans laquelle une deuxième chambre (47) est formée entre le godet (42) et le deuxième piston (17), dans laquelle les deux chambres (46, 47) sont raccordées l'une à l'autre par au moins un canal (44, 45), dans laquelle les fentes d'étanchéité (49, 50, 51) de la première et de la deuxième chambres (46, 47) présentent une largeur de 2 à 20 µm, en particulier une largeur de 8 µm, de telle manière que la première et la deuxième chambres (46, 47) soient étanches par rapport à un espace intérieur de la soupape d'injection pour de brèves applications de pression et équilibrent des différences de pression sur des périodes de temps plus longues, et dans laquelle un piston (12, 17) est en liaison active avec le pointeau (5) et l'autre piston (12, 17) est en liaison active avec l'actionneur (7).
  2. Soupape d'injection selon la revendication 1, dans laquelle un élément de ressort (48), qui précontraint le godet mobile (42) en direction du premier piston (12), est serré entre le pointeau (5) et le godet mobile (42).
  3. Soupape d'injection selon une des revendications 1 ou 2, dans laquelle le premier piston (12) s'applique sur un côté supérieur d'un fond (43) du godet mobile (42).
  4. Soupape d'injection selon l'une quelconque des revendications 1 à 3, dans laquelle il est prévu deux canaux (44, 45), qui relient les deux chambres (46, 47), dans laquelle les deux canaux (44, 45) sont pratiqués dans un fond (43) du godet mobile (42).
  5. Soupape d'injection selon l'une quelconque des revendications 1 à 4, dans laquelle le deuxième piston (17) limite la deuxième chambre (47) avec une deuxième face frontale (53), dans laquelle l'autre godet (14) limite la première chambre (46) avec une deuxième face annulaire (52), qui entoure le premier piston (12), et dans laquelle la deuxième face frontale (53) est plus petite que la deuxième face annulaire (52) .
  6. Soupape d'injection selon l'une quelconque des revendications 1 à 5, dans laquelle le godet immobile (14) est relié au corps (2) par une région de bord en forme de rondelle annulaire (41), dans laquelle il se trouve dans la région de bord (41) un alésage (6) qui relie un espace intérieur supérieur de la soupape d'injection à un espace intérieur inférieur de la soupape d'injection.
EP10721180.7A 2009-06-10 2010-06-10 Soupape d'injection avec un ensemble de transmission Not-in-force EP2440769B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009024596A DE102009024596A1 (de) 2009-06-10 2009-06-10 Einspritzventil mit Übertragungseinheit
PCT/EP2010/058158 WO2010142767A1 (fr) 2009-06-10 2010-06-10 Soupape d'injection avec unité de transfert

Publications (2)

Publication Number Publication Date
EP2440769A1 EP2440769A1 (fr) 2012-04-18
EP2440769B1 true EP2440769B1 (fr) 2018-02-28

Family

ID=42301841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10721180.7A Not-in-force EP2440769B1 (fr) 2009-06-10 2010-06-10 Soupape d'injection avec un ensemble de transmission

Country Status (4)

Country Link
US (1) US9222451B2 (fr)
EP (1) EP2440769B1 (fr)
DE (1) DE102009024596A1 (fr)
WO (1) WO2010142767A1 (fr)

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DE102014226673A1 (de) * 2014-12-19 2016-06-23 Robert Bosch Gmbh Hydraulische Kopplereinheit zur Steuerung eines Ventils
DE102016109073B4 (de) * 2015-06-05 2022-02-17 Denso Corporation Kraftstoffeinspritzventil und Kraftstoffeinspritzventilcontroller
DE102015223043A1 (de) * 2015-11-23 2017-05-24 Robert Bosch Gmbh Kraftstoff-Injektor

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Also Published As

Publication number Publication date
US9222451B2 (en) 2015-12-29
US20120160214A1 (en) 2012-06-28
DE102009024596A1 (de) 2011-04-07
WO2010142767A1 (fr) 2010-12-16
EP2440769A1 (fr) 2012-04-18

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