EP2049788A1 - Dispositif d'injection de combustible pour un moteur à combustion - Google Patents

Dispositif d'injection de combustible pour un moteur à combustion

Info

Publication number
EP2049788A1
EP2049788A1 EP07788067A EP07788067A EP2049788A1 EP 2049788 A1 EP2049788 A1 EP 2049788A1 EP 07788067 A EP07788067 A EP 07788067A EP 07788067 A EP07788067 A EP 07788067A EP 2049788 A1 EP2049788 A1 EP 2049788A1
Authority
EP
European Patent Office
Prior art keywords
piston
fuel
force
injection device
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.)
Withdrawn
Application number
EP07788067A
Other languages
German (de)
English (en)
Inventor
Georg Bachmaier
Gerit Ebelsberger
Bernhard Gottlieb
Michael HÖGE
Andreas Kappel
Erhard Magori
Randolf Mock
Thomas Vontz
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP2049788A1 publication Critical patent/EP2049788A1/fr
Withdrawn legal-status Critical Current

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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0073—Pressure balanced valves
    • 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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means

Definitions

  • the present invention relates to a fuel injection device for an internal combustion engine according to the preamble of patent claim 1.
  • Such a fuel injection device for an internal combustion engine which is known from DE 102 46 974 and is used, for example, for a common-rail injection system, comprises an inlet opening, an outlet opening, a housing and a piston as a nozzle needle, wherein the piston, which has a front end and a rear end, in a recess formed in the housing, between one
  • the fuel injection device known from DE 102 46 974 enables a high injection pressure of the fuel to be injected, but can not achieve extremely fast and precise multiple direct injection as desired for diesel engines in order to achieve better combustion and reduce pollutant emissions.
  • the present invention has for its object to provide a fuel injection device for an internal combustion engine, which allows a particularly precise and fast Einsprit ⁇ tion.
  • the object underlying the invention is achieved by a fuel injection device for an internal combustion engine having the features of patent claim 1.
  • the invention opens the inlet opening in the fuel ⁇ space, and opens the channel in the front chamber, so that a pressure equalization between the front chamber and the rear chamber takes place.
  • the injection device is not particularly complex and therefore inexpensive to manufacture.
  • the piston is rotationally symmetrical, and the channel extends along the axis of symmetry through the piston.
  • the channel thus does not obstruct the Vorse ⁇ hung of shut-off elements between the housing and the piston.
  • the preferred embodiment extends around the piston a stop edge which abuts in the closed ⁇ position against the sealing seat and so the outlet opening closing off opposite the inlet opening, and extends around the piston a further stop edge, which in the Sch.stel- lung against the sealing seat abuts and thus shuts off the outlet opening opposite the channel.
  • a large number of injection holes can be formed between the two stop edges, as a result of which only a small dead volume between the two stop edges is required and the injection volume can be easily controlled.
  • the two stop edges make a stable, tight and permanent shut-off of the outlet port.
  • the piston is configured such that in the closed position, fuel at the rear end exerts a force on the piston along the piston (4, 4a) that is substantially equal in magnitude to a force that is fuel in the piston front chamber along the piston exerts.
  • the isobar piston with little effort from the closed position to the injection position.
  • “Essentially” in this case means that a difference in the forces at the front end and at the rear end is negligible, the injection position in this context being any position of the piston in which the outlet opening is not closed.
  • the piston is formed so that in the closed position ⁇ fuel in the fuel space exerts substantially no force on the front end.
  • pressure differences affect Zvi ⁇ rule the fuel in the rear chamber and the fuel in the area at the front end, in which the inlet port opens, not isobaric equilibrium of forces.
  • a sleeve between the rear end of the piston and the housing is provided.
  • the sleeve makes it possible to form the piston in such a way that, in the closed position, fuel in a region at the front end, in which the inlet opening opens, exerts substantially no force on the front end.
  • the piston is designed such that in the closed position, fuel at the rear end exerts a force on the piston along the piston which is substantially equal in magnitude to a force that is fuel in a region at the front end. in which the channel opens, along which piston exerts.
  • an equilibrium of forces can then also be set if the fuel in the rear chamber has a different pressure than the fuel in an area at the front end in which the inlet opening opens.
  • the piston is formed so that in the injection position, a force exerted by fuel at the rear end of the piston along the piston, in absolute value, the fuel is a Kraftdiffe ⁇ rence smaller than a force of the front end on the piston along the piston exerts.
  • an area on the front side of the piston between the two stop edges, which covers the outlet opening, can thus be created.
  • a spring is provided which exerts a force on the rear end along the piston in the injection position, which is the same magnitude as the force difference.
  • FIG. 1 is a cross section of a fuel injection device
  • FIG. FIG. 2 shows a cross section of a further fuel injection device
  • FIG. 3 is a detailed view of the front end of the fuel injector of FIG. 1;
  • FIG. 4 is a detailed view of the front end of the fuel injector of FIG. Second
  • FIG. 1 shows a cross section through a force injection device for an internal combustion engine. At least one outlet opening ⁇ A 1 in the housing 2 is connected to a collecting line (common rail, not shown), in which
  • Fuel under high pressure (about 2000 bar) is located, and opens, at least in the closed position in a recess in the interior of the housing 2 at the height of a groove 3, the ring ⁇ runs around a cylindrical piston 4, the recess in the recess is recorded and represents a nozzle needle.
  • the piston 4 is connected at its rear end with a drive rod 5, which runs through a cylindrical Antriebsstan ⁇ gen Edition 6 and is preferably formed integrally with the piston 4.
  • the drive rod 5 and thus the piston 4 are reciprocated along the recess between a closed position and an injection position by a piezoelectric actuator (not shown) disposed behind the drive rod guide 6 integral with the housing 2.
  • the drive rod 5 is actuated by a Ak ⁇ tor, such as a servo valve or a piezoelekt ⁇ step actuator.
  • a rear chamber 7 is provided which can be constricted in the injection Stel ⁇ lung to a narrow slot and egg NEN channel 8, which is arranged along the axis of symmetry S of the piston 4, with a front chamber 9 connected to the front end of the piston 4.
  • the front chamber 9 which may also be narrowed in the closed position to a narrow slot, open several outlet openings 10. From the outside of the housing 2 run a plurality of leakage holes 11 to the recess in the housing 2 in height of the piston 4 and the drive rod guide 6. From the front chamber 9 can leak some leakage on the tight leadership of the piston 4 in the housing 2.
  • FIG. 3 shows a detailed view of the front end of the fuel injection device of FIG. 1.
  • a fuel space 17 is formed as a gap between the piston 4 and the housing 2, so that fuel in the injection position can flow along the gap from the inlet port 1 to the outlet ports 10.
  • the fuel injection device is located in FIG. 3 in the closed position.
  • the front stop edge 14 abuts di ⁇ rectly before the exhaust ports 10 which are annularly arranged along the inner wall, so that fuel, which is located in the rear chamber 7 or the front chamber 9, not escape from the housing 2 from the exhaust ports 10 can.
  • the rear stop edge 15 abuts directly behind the outlet openings 10 against the housing 2, so that fuel can not flow from the at least one inlet opening 1 to the outlet openings 10.
  • the stop edges 14 and 15 and annular projections may be provided which extend below or above the outlet openings 10 along the inner wall of the recess (or to the piston 4) and in the closed position against the piston 4.
  • the front and rear stop edge 14, 15 form sealing edges which close the outlet openings 10 in the closed position and separate the fuel space 20 from the front chamber 9.
  • FIG. Fig. 2 shows another fuel injection device.
  • the same elements are denoted by the same reference numerals followed by a lower case letter "a.”
  • the other fuel injection device differs from the fuel injection device of Fig. 1 by a sleeve 16a surrounding the rear end of the piston 4a
  • the sleeve 16a may be fixedly connected to the housing 4a.
  • the fuel injector also has no spring 12.
  • fuel in the fuel chamber 17a is prevented from applying force to the forward end
  • the piston is further configured such that fuel at the rear end exerts on the piston 2a a force equal in magnitude to a force which exerts fuels in the front chamber 9a on the piston 2a.
  • FIG. 4 shows a detailed view of the front end of the fuel injection device of FIG. 2.
  • the variables R, r s , r h , r v are chosen such that the rear effective cross-sectional area A h is as large as the effective cross-sectional area A k of the front chamber.

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 un dispositif d'injection de combustible pour un moteur à combustion avec un orifice d'entrée (1), un orifice d'évacuation (10), un boîtier (2) et un piston (4), dans lequel le piston (4), qui présente une extrémité avant et une extrémité arrière, est déplaçable dans un creux formé dans le boîtier (2) entre une position de fermeture et une position d'injection, un canal (8) passant de l'extrémité avant du piston (4) à l'extrémité arrière du piston (4), dans lequel est formée, derrière l'extrémité arrière du piston (4), une chambre arrière (7) dans laquelle débouche le canal (8), dans lequel est formée, avant l'extrémité avant du piston (4), une chambre avant (9), une chambre de combustible (17) étant formée latéralement entre le boîtier (2) et l'extrémité avant du piston (4), et dans lequel le piston (4) est plaqué contre un siège étanche (14, 15) dans la position de fermeture et ferme ainsi l'orifice d'évacuation (10). Une injection particulièrement précise et rapide est possible grâce au fait que l'orifice d'entrée (1) débouche dans la chambre de combustible (17), et que le canal (8) débouche dans la chambre avant (9), de sorte qu'il se produit un équilibrage de pression entre la chambre avant (9) et la chambre arrière (7).
EP07788067A 2006-08-09 2007-07-31 Dispositif d'injection de combustible pour un moteur à combustion Withdrawn EP2049788A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006037236 2006-08-09
PCT/EP2007/057871 WO2008017614A1 (fr) 2006-08-09 2007-07-31 Dispositif d'injection de combustible pour un moteur à combustion

Publications (1)

Publication Number Publication Date
EP2049788A1 true EP2049788A1 (fr) 2009-04-22

Family

ID=38626517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07788067A Withdrawn EP2049788A1 (fr) 2006-08-09 2007-07-31 Dispositif d'injection de combustible pour un moteur à combustion

Country Status (2)

Country Link
EP (1) EP2049788A1 (fr)
WO (1) WO2008017614A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2660457A1 (fr) * 2012-05-02 2013-11-06 Delphi Technologies Holding S.à.r.l. Injecteur à carburant

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19907356A1 (de) * 1999-02-20 2000-10-12 Bosch Gmbh Robert Düseneinheit zur Dosierung von Flüssigkeiten oder Gasen
DE10148350A1 (de) * 2001-09-29 2003-04-24 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung, insbesondere Injektor für Brennkraftmaschinen mit Direkteinspritzung, sowie Kraftstoffsystem und Brennkraftmaschine
DE10246974A1 (de) 2002-10-09 2004-04-22 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine
EP1555427B1 (fr) * 2004-01-13 2007-10-10 Delphi Technologies, Inc. Injecteur de carburant
DE102004002084A1 (de) * 2004-01-15 2005-08-04 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008017614A1 *

Also Published As

Publication number Publication date
WO2008017614A1 (fr) 2008-02-14

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