EP2440769A1 - Soupape d'injection avec unité de transfert - Google Patents

Soupape d'injection avec unité de transfert

Info

Publication number
EP2440769A1
EP2440769A1 EP10721180A EP10721180A EP2440769A1 EP 2440769 A1 EP2440769 A1 EP 2440769A1 EP 10721180 A EP10721180 A EP 10721180A EP 10721180 A EP10721180 A EP 10721180A EP 2440769 A1 EP2440769 A1 EP 2440769A1
Authority
EP
European Patent Office
Prior art keywords
pot
piston
injection valve
actuator
movable
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.)
Granted
Application number
EP10721180A
Other languages
German (de)
English (en)
Other versions
EP2440769B1 (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.)
Aumovio Germany GmbH
Original Assignee
Continental Automotive Technologies 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 Technologies GmbH filed Critical Continental Automotive Technologies 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

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
    • 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 a bottom of the further pot with a first sealing gap, wherein the second piston is guided in a sleeve portion of the pot with a second 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 over at least one channel are connected to each other 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.
  • Figure 1 shows a schematic structure of an injection valve
  • FIG. 2 shows the transmission unit
  • FIG. 3 shows a nozzle body with a nozzle needle
  • FIG. 4 shows a nozzle needle with a second pot
  • FIG. 5 shows a nozzle needle with a fixed pot
  • Figure 6 shows a nozzle needle with transmission piston.
  • Figure 1 shows 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 space 8 is formed between the nozzle needle 5 and the nozzle body 3, which is supplied with fuel via channels, not shown, 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.
  • the nozzle needle 5 lifts off from the sealing seat 10 and releases a hydraulic connection between the fuel space 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.
  • the deflection of the actuator 7 in the direction of the nozzle needle 5 in an opposite movement of the Du- sennadel 5 implemented in the direction of the actuator 7 by means of the transmission unit 40.
  • FIG. 2 shows an enlarged view of the transfer unit 40.
  • a cylindrical first piston 12 protrudes through an opening 15 of a bottom 13 of a pot 14.
  • the pot 14 is firmly connected to the housing 2 via an edge region 41 which surrounds an annular disk.
  • 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 equalize pressure differences that are present for longer periods of time, ie longer than injection events.
  • the transmission unit 40 functions as follows: in the non-activated state of the actuator 7, the nozzle needle 5 sits with the sealing surface 11 on the sealing seat 10, so that there is no connection between the fuel space 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 decreases.
  • 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.
  • Figure 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.
  • Figure 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 shown in FIG. Then, the piston 12 is inserted through the opening of the bottom 13, as shown in Figure 6. Then, the actuator 7 is mounted in the housing and the assembly as shown in Figure 1 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)

Abstract

La présente invention concerne une soupape d'injection (1) pour l'injection de carburant dans un moteur à combustion interne, comprenant un actionneur (7) et une aiguille d'injecteur (5) associé à un siège d'étanchéité (10), une unité de transfert (40) hydraulique permettant une liaison fonctionnelle entre l'actionneur (7) et l'aiguille d'injecteur (5). Selon l'invention, l'unité de transfert (40) comporte deux pistons (12, 17) mobiles, entre lesquels est disposé un pot mobile (42) qui est lui-même guidé dans un autre pot fixe (14), le premier piston (12) étant guidé à travers le fond (13) de l'autre pot (14) par une troisième fente d'étanchéité (49), le deuxième piston (17) étant guidé dans une partie manchon du pot (42) par une quatrième fente d'étanchéité (50), un première chambre (46) étant formée entre l'autre pot (42) et le pot (14), une deuxième chambre étant formé entre le pot (14) et le deuxième piston (17), les deux chambres (46, 47) étant reliés entre elles par au moins un canal (44, 45), un piston (12, 17) étant en liaison fonctionnelle avec l'aiguille d'injecteur (5) et l'autre piston (12, 17) étant en liaison fonctionnelle avec l'actionneur (7).
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 true EP2440769A1 (fr) 2012-04-18
EP2440769B1 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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EP2674608B1 (fr) * 2012-06-13 2015-08-12 Delphi International Operations Luxembourg S.à r.l. Injecteur à carburant
DE102012212264B4 (de) 2012-07-13 2014-02-13 Continental Automotive Gmbh Verfahren zum Herstellen eines Festkörperaktuators
DE102012212266B4 (de) * 2012-07-13 2015-01-22 Continental Automotive Gmbh Fluidinjektor
DE102014210101A1 (de) * 2014-05-27 2015-12-03 Robert Bosch Gmbh Kraftstoffinjektor
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
DE102021203738A1 (de) * 2021-04-15 2022-10-20 Robert Bosch Gesellschaft mit beschränkter Haftung Gasinjektor mit kurzer axialer Bauweise

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Also Published As

Publication number Publication date
EP2440769B1 (fr) 2018-02-28
WO2010142767A1 (fr) 2010-12-16
US20120160214A1 (en) 2012-06-28
DE102009024596A1 (de) 2011-04-07
US9222451B2 (en) 2015-12-29

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