EP1457662B1 - Injector de carburant - Google Patents

Injector de carburant Download PDF

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Publication number
EP1457662B1
EP1457662B1 EP04002029A EP04002029A EP1457662B1 EP 1457662 B1 EP1457662 B1 EP 1457662B1 EP 04002029 A EP04002029 A EP 04002029A EP 04002029 A EP04002029 A EP 04002029A EP 1457662 B1 EP1457662 B1 EP 1457662B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
coupler
valve according
actuator
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.)
Expired - Lifetime
Application number
EP04002029A
Other languages
German (de)
English (en)
Other versions
EP1457662A1 (fr
Inventor
René Deponte
Fevzi Yildirim
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 EP1457662A1 publication Critical patent/EP1457662A1/fr
Application granted granted Critical
Publication of EP1457662B1 publication Critical patent/EP1457662B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • a fuel injection valve is known, which is actuated by a piezoelectric actuator.
  • a hydraulic coupler is provided, in which a hydraulic medium can flow out of a coupler gap via a leakage gap to a compensation chamber.
  • the compensation chamber is bounded by a membrane formed as a corrugated tube.
  • piezo high-pressure injection valves which use fuel as a coupling medium.
  • fuel as a coupling medium.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that disturbing changes in length can be avoided by improving the temperature compensation.
  • a first compensation chamber of the hydraulic coupler can be separated from a second compensation chamber. Since the actuator is housed in an actuator housing, the hydraulic medium can be acted upon directly by a piston, without causing any sealing problems. In this case, a membrane-like boundary of the compensation chamber is provided, which compensates for the volume difference in the compensation chamber.
  • a preloaded compression spring is arranged between the actuator housing and the bottom plate, the hydraulic medium in the rest position of the piezoelectric actuator can always flow into the coupler gaps. Due to the sealing of the two compensation chambers, a simple electrical supply line from the outside to the piezoelectric actuator can be set, which avoids sealing problems and allows reliable operation of the fuel injection valve.
  • a fuel injection valve 1 shown in longitudinal section in FIG. 1 has a valve housing 2 which surrounds a piezoelectric actuator 3.
  • the actuator 3 is in turn housed in an actuator housing 4 and is supported with an end face 6 on a sealing plate 5, which is part of the actuator housing 4.
  • On an opposite end face 7 of the actuator 3 is located on a transmission pin 8.
  • the transmission pin 8 has a radially projecting collar 9, on which a pressurized biasing spring 10 is supported.
  • the biasing spring 14 is clamped between the collar 9 and an inwardly projecting collar 11 on the actuator housing 4, wherein it acts on the actuator 3 in the direction of the sealing plate 5 with a compressive force.
  • valve needle 14 In the axial extension of the transmission bolt 8 is a valve needle 14 which carries at its end remote from the transmission pin 8 a valve closing body 15.
  • the discharge valve 17 is formed in the example opening to the outside, but can also be designed to open inwardly.
  • a return spring 18 acts on the valve needle 14 with a restoring force in the direction of a closed position of the ejection valve 17.
  • the valve housing 2 is sleeve-shaped. Valve side, a bottom 19 is provided, which has a central receiving bore 21. In the central receiving bore 21 a likewise sleeve-shaped projection 20 is inserted. The projection 20 receives the valve needle 14.
  • valve housing 2 An end face of the valve housing 2 opposite the bottom 19 is closed by a cover 22.
  • cover 22 In the cover 22 there is a supply line 23 for the attached via the ejection valve 17 fuel, which leads to a hollow interior 24 of the fuel injection valve 1.
  • a bottom plate 28 is inserted into the valve housing 2.
  • the bottom plate 28 is firmly connected to the valve housing 2.
  • a longitudinal groove 23a in the bottom plate 28 connects the Supply line 23 to the interior 24, so that the interior 24 is always filled with fuel.
  • the actuator housing 4 is surrounded by a sleeve-shaped sealing housing 29 which has a base plate 30 with a passage opening 31 for the axial penetration of the transmission bolt 8.
  • a sleeve-shaped sealing membrane 33 is provided, which surrounds the transmission pin 8 partially and prevents fuel from the interior 24 can penetrate into a located within the sealing housing 29 sealing space 34.
  • One of the base plate 30 opposite open end of the sealing housing 29 is completely covered by the bottom plate 28.
  • a central blind bore 36 is provided in the bottom plate 28.
  • a cylindrical nose 37 which partially engages in the blind bore 36 and thereby forms a piston of a hydraulic coupler 40.
  • a first coupler diaphragm 41 which is formed hütsenförmig example, by a corrugated tube.
  • the first coupler diaphragm 41 is welded on the one hand to the actuator housing 4 on the other hand to the bottom plate 28, so that within the first coupler diaphragm 41, a first compensation chamber 42 is formed.
  • a recess 43 is inserted into the bottom plate 28, in which a second coupling membrane 44 is arranged, the valve side, a second compensation chamber 45 limited.
  • the second coupler membrane 44 is cup-shaped and first inserted into the recess 43 with a closed underside of the cup.
  • a side surface 44a of the second coupler diaphragm 44 is sealingly fixed to the bottom plate 28 at the end.
  • the second compensation chamber 45 is connected to the first compensation chamber 42 via an inserted in the bottom plate 28 through opening 46, which serves as a throttle opening.
  • first and second compensation chamber 42, 55 is a hydraulic medium, which preferably has a high viscosity and a high vapor pressure in order to ensure a low tendency to vapor bubble formation at reduced pressure.
  • An electrical connection line 48 is axiar mein by the cover 22 and the bottom plate 28 in the sealing space 34 between the actuator housing 4 and sealing housing 29 out and from there radially inwardly to the actuator.
  • the second embodiment of a fuel injection valve 1 shown in Figure 2 differs only slightly. Identical or equivalent features are identified by the same reference numerals.
  • a difference from Figure 1 is that a coaxially projecting from the base plate 30 tube 53 serves as a piston 37. A formed between the tube 53 and the bottom plate 28. Distance represents the coupler gap 50.
  • a coupler spring 52 ensures that a sufficient coupler gap 50 always forms in the rest position.
  • the tube 53 extends through a bore 54 through to the second coupling diaphragm 44 and limited together with this and the bottom plate 28, the second compensation chamber 45.
  • a resulting between pipe 53 and bore 54 gap 55 is analogous to the passage opening 46 as a first compensation space 42, the electrical supply line 48 is in this case over the cover 22 coaxial with the interior of the tube 53 and from there through the actuator housing 4 to the actuator 3 out.
  • the second coupler diaphragm 44 is arranged as a double sleeve between the bottom plate 28 and the tube 53, wherein the double sleeve are formed by two mutually parallel axial corrugated tubes, which are interconnected via an annular surface 57.
  • the annular surface 57 is acted upon by a diaphragm spring 51 in the direction of the bottom plate 28 and the coupler medium located in the second compensation chamber 45.
  • the function of the fuel injection valve 1 is as follows:
  • the discharge valve 17 assumes the closed position shown in Figure 1, in which the valve needle 14 is urged by the return spring 18 against the valve seat surface 16.
  • a coupler gap 50 filled with coupler medium is formed between the piston 37 and the bottom plate 28, which opens via an annular gap 56 on the radial outer side of the piston 37 into the first compensation chamber 42.
  • a diaphragm spring 51 acts on the second coupling diaphragm 44 with a pressure force such that a predetermined pressure prevails within the hydraulic medium. If the piezoelectric actuator 3 is acted upon by voltage, it expands abruptly and transmits this elongation to the transmission bolt 8 and the valve needle 14, so that the ejection valve 17 opens.
  • the actuator 3 is supported on the bottom plate 28 via the piston 37 and the hydraulic medium located in the coupler gap 50.
  • hydraulic medium flows slowly via the leakage gap 51 into the first compensation chamber 42.
  • a balance of hydraulic medium takes place.
  • the sleeve or cup-like design of the actuator housing 4, sealing housing 29 and valve housing 2 allows a simple production of the fuel injection valve I, for example by using thermoformed sleeves.

Landscapes

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

Claims (17)

  1. Injecteur de carburant comprenant un actionneur piézo-électrique, électrostrictif ou magnétostrictif (3), une aiguille d'injecteur (14) en coopération avec l'actionneur (3) destinée à actionner un corps obturateur de soupape (15), et un coupleur hydraulique (40) qui comprend un piston (37) qui s'engage au moins partiellement dans une ouverture réceptrice et forme avec cette dernière une fente de coupleur (50, 51) remplie d'un fluide hydraulique et entourée d'une première chambre de compensation (52) limitée par une première membrane de coupleur (41),
    caractérisé en ce que
    le coupleur hydraulique (40) possède une deuxième chambre de compensation (45) limitée par une deuxième membrane de coupleur (44) et reliée à la première chambre de compensation (45) par au moins une ouverture de passage (46, 55).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    la première chambre de compensation (52) est formée entre un boîtier de coupleur (5) et une plaque de fond (28) solidaire du boîtier.
  3. Injecteur de carburant selon la revendication 2,
    caractérisé en ce que
    la deuxième chambre de compensation (45) est formée sur un côté de la plaque de fond (28) éloigné de l'actionneur (3).
  4. Injecteur de carburant selon la revendication 2 ou 3,
    caractérisé en ce que
    la première membrane de coupleur (41) est disposée entre le boîtier (4) de l'actionneur et la plaque de fond (28) à la façon d'un manchon.
  5. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    la deuxième chambre de compensation (45) est formée dans une cavité (43) de la plaque de fond (28).
  6. Injecteur de carburant selon la revendication 5,
    caractérisé en ce que
    la deuxième membrane de coupleur (44) est disposée à l'intérieur de la cavité (43).
  7. Injecteur de carburant selon la revendication 6,
    caractérisé en ce que
    la première membrane de coupleur (41) et la deuxième membrane de coupleur (44) sont formées chacune par un tube annelé présentant des plis radiaux.
  8. Injecteur de carburant selon la revendication 7.
    caractérisé en ce que
    l'ouverture d'étranglement (46) est formée axialement dans la plaque de fond (28).
  9. Injecteur de carburant selon la revendication 8,
    caractérisé en ce qu'
    à la plaque d'étanchéité (5), est attaché un piston (37) qui fait saillie axialement en direction de la plaque de fond (28) et qui est engagé dans un perçage de réception (36) ménagé dans la plaque de fond (28), pour former une fente annulaire (56) avec le perçage de réception (36).
  10. Injecteur de carburant selon la revendication 9,
    caractérisé en ce que
    l'ouverture d'étranglement (46) est constituée par un perçage de passage axial séparé.
  11. Injecteur de carburant selon la revendication 10,
    caractérisé en ce que
    le boîtier d'actionneur (4) est entouré radialement par un boîtier d'étanchéité (29) qui isole l'actionneur (3) d'un volume intérieur (24) de l'injecteur de carburant (1) et qui forme une chambre d'étanchéité (34) entre le boîtier d'étanchéité (29) et le boîtier d'actionneur (4).
  12. Injecteur de carburant selon la revendication 11,
    caractérisé en ce qu'
    une ligne d'alimentation électrique (48) aboutissant à l'actionneur (3) mène axialement à la chambre d'étanchéité (34) en traversant la plaque de fond (28) et, de là, mène à l'actionneur (3) en traversant le boîtier d'actionneur (4).
  13. Injecteur de carburant selon la revendication 8,
    caractérisé en ce que
    dans la plaque de fond (28) un perçage axial (54) fait passer un tube (53) solidaire de la plaque d'étanchéité (5).
  14. Injecteur de carburant selon la revendication 13,
    caractérisé en ce que
    la deuxième membrane de coupleur (44) est disposée entre la plaque de fond (28) et le tube (53) à la façon d'un double manchon, le double manchon étant formé par deux tubes annelés axiaux disposés parallèlement entre eux, et reliés entre eux par une surface annulaire (57).
  15. Injecteur de carburant selon la revendication 14,
    caractérisé en ce que
    la surface annulaire (37) est sollicitée par un ressort de membrane (51) en direction de la plaque de fond (28) et en direction du milieu de coupleur qui se trouve dans la deuxième chambre de compensation (45).
  16. Injecteur de carburant selon la revendication 15,
    caractérisé en ce que
    la ligne d'alimentation électrique (48) aboutissant à l'actionneur (3) mène au boîtier d'actionneur (4) en passant dans le tube (51) et, de là, à l'actionneur (3).
  17. Injecteur de carburant selon une des revendications précédentes,
    caractérisé en ce qu'
    un ressort de coupleur (52) est disposé entre le boîtier d'actionneur (4) et la plaque de fond (28).
EP04002029A 2003-03-10 2004-01-30 Injector de carburant Expired - Lifetime EP1457662B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10310297 2003-03-10
DE10310297A DE10310297A1 (de) 2003-03-10 2003-03-10 Brennstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP1457662A1 EP1457662A1 (fr) 2004-09-15
EP1457662B1 true EP1457662B1 (fr) 2006-01-18

Family

ID=32748176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04002029A Expired - Lifetime EP1457662B1 (fr) 2003-03-10 2004-01-30 Injector de carburant

Country Status (3)

Country Link
EP (1) EP1457662B1 (fr)
AT (1) ATE316205T1 (fr)
DE (2) DE10310297A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005024223A1 (fr) * 2003-09-08 2005-03-17 Siemens Aktiengesellschaft Soupape d'injection pour l'injection de carburant dans un moteur a combustion interne
DE602005020172D1 (de) * 2005-12-12 2010-05-06 Continental Automotive Italy S Einpritzventil und Herstellungsverfahren eines solchen Einspritzventils
DE102007008901B4 (de) * 2007-02-23 2008-10-16 Compact Dynamics Gmbh Fluid-Einspritzventil
DE102007053423A1 (de) * 2007-11-09 2009-05-14 Robert Bosch Gmbh Piezoelektrisches Aktormodul
DE102009046356A1 (de) * 2009-11-03 2011-05-05 Robert Bosch Gmbh Aktormodul und Brennstoffeinspritzventil
DE102011087005A1 (de) * 2011-11-24 2013-05-29 Robert Bosch Gmbh Ventil zum Zumessen eines strömenden Mediums
CN107091355B (zh) * 2017-06-28 2023-05-30 哈尔滨工程大学 一种旁通式轴向进气的压电式外导向燃气喷射阀

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10030232A1 (de) * 2000-06-20 2002-01-17 Siemens Ag Vorrichtung zum Übertragen einer Bewegung mit Spielausgleich
DE10140796A1 (de) * 2001-08-20 2003-03-06 Bosch Gmbh Robert Brennstoffeinspritzventil
DE50312340D1 (de) * 2002-04-22 2010-03-04 Continental Automotive Gmbh Dosiervorrichtung für fluide, insbesondere kraftfahrzeug-einspritzventil

Also Published As

Publication number Publication date
EP1457662A1 (fr) 2004-09-15
DE10310297A1 (de) 2004-09-23
DE502004000246D1 (de) 2006-04-06
ATE316205T1 (de) 2006-02-15

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