EP1036271B1 - Injecteur pour injection de carburant intermittente - Google Patents

Injecteur pour injection de carburant intermittente Download PDF

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Publication number
EP1036271B1
EP1036271B1 EP98965750A EP98965750A EP1036271B1 EP 1036271 B1 EP1036271 B1 EP 1036271B1 EP 98965750 A EP98965750 A EP 98965750A EP 98965750 A EP98965750 A EP 98965750A EP 1036271 B1 EP1036271 B1 EP 1036271B1
Authority
EP
European Patent Office
Prior art keywords
valve
actuator
injection
pressure
valve 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
EP98965750A
Other languages
German (de)
English (en)
Other versions
EP1036271A1 (fr
Inventor
Wolfgang Scheibe
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.)
LOrange GmbH
Original Assignee
LOrange 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 LOrange GmbH filed Critical LOrange GmbH
Publication of EP1036271A1 publication Critical patent/EP1036271A1/fr
Application granted granted Critical
Publication of EP1036271B1 publication Critical patent/EP1036271B1/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
    • 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
    • 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
    • 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

Definitions

  • the invention relates to an injection valve for intermittent fuel injection in the combustion chamber of an internal combustion engine with a in a valve housing between a closed and open position axially movably guided valve actuator, which in Closed position is pressed against a substantially conical valve seat and so the closes in a blind hole downstream of the valve seat injection openings and with a control chamber that has at least one inlet throttle bore with a high pressure leading fuel supply line is connected and via an outlet throttle bore with a drain line under low pressure, the pressure in the control room is controllable via an electromagnetically actuated control valve element and depends on Control room pressure the valve actuator is actuated.
  • valve actuator is designed as a nozzle needle with its tip on presses the conical nozzle needle seat to close the injector Keep condition.
  • the dynamic stress on the nozzle tip is correspondingly high with the nozzle needle seat, which depends on the mass of the moving nozzle needle at each Closing process of the nozzle occurs as an impact load. A reduction in the impact load the slower closing movement of the nozzle needle is therefore out of the question, because this means that inaccurate metering and, above all, dripping of the nozzle are accepted should be.
  • the object of the present invention is therefore to provide an injection valve of the type mentioned at the beginning To improve the genus so that even at extremely high injection pressures and high required accuracy with regard to the injection quantities an impermissibly large load between valve actuator and valve seat is avoided and thus long service life of an injection valve can be reached.
  • the object is achieved in that a valve actuator holder in the valve housing is arranged, which has a lower end in the immediate Extends near the valve seat, the valve actuator in the lower end of the valve actuator holder the actuating movement is permitted and the control chamber as a bore in the valve actuator holder is guided to the valve actuator and this is pressurized.
  • the inventive design of an injection valve ensures that the extremely high pressure level and valve actuator operating at high actuating speeds can have the lowest possible mass and thus the dynamic forces at the valve seat be significantly reduced.
  • the fixed arrangement of a valve actuator holder extends into the immediate vicinity of the valve seat and receives the valve actuator there the prerequisite for the small dimensions and thus the low mass of the valve actuator.
  • a valve actuator in the arrangement according to the invention available, the dimension of which is very small in the direction of the actuating movement.
  • valve actuator is a ball. It
  • cylindrical valve actuators in the form of pistons are also possible, the extension in the axial direction is not chosen to be significantly larger than the diameter.
  • the injection valve can be designed in such a way that the Spring force acts on the valve actuator in the closing direction, as well as in the opposite manner so that a spring applies a permanent force to the valve actuator in the opening direction.
  • the control and the exact movement of the valve actuator is controlled by hydrauli pressure.
  • the force are by appropriate geometric design of the valve head member with pressure surfaces established.
  • the injection valve shown in section in Fig. 1 has a valve housing 9 with a connecting piece 29 for a high-pressure fuel line.
  • a nozzle body 11 of an injection nozzle is screwed by means of a nozzle nut 10.
  • a fuel feed line 13 leads from the connecting piece 29 through the valve housing 9 and through the nozzle body 11 to a valve seat 6 of the injection nozzle.
  • an essentially cylindrical valve actuator holder 14 used, which has a control chamber 2 formed as a central bore. The valve actuator holder 14 extends down to the valve seat 6.
  • an inlet throttle bore 3 is provided, which the fuel inlet line 13 connects to the control room 2.
  • an outlet throttle bore 18 is provided, which in control room 2 has a fuel outlet line 12 connects.
  • the cross section of the discharge throttle bore 18 is larger than the cross section the inlet throttle bore 3.
  • valve actuator holder 14 On his is centered in the conical valve seat 6 via a centering collar 16.
  • the control room 2 of the valve actuator holder 14 extends downward to a bore in which Valve actuator 4, which is designed as a ball, is axially movable.
  • Valve actuator 4 which is designed as a ball
  • valve actuator 4 As in 2, when the injector is closed, the valve actuator 4, namely the Ball acted upon by the pressure in the control chamber 2, this pressure via the inlet throttle bore 3 is equal to the high pressure in the fuel feed line 13.
  • the outlet throttle bore 18 of the control room 2 is closed by the control valve element 8. If the control valve element 8 is now raised by the electromagnet 28 and thus the Drain throttle bore opened against the drain line 12, the pressure in the control chamber drops 2 from and the spherical valve actuator 4 is due to the partial cross-section from below of the valve actuator acting high pressure is lifted from the valve seat 6. The valve cross section is released and there is an injection that continues until the Pressure in the control chamber 2 by closing the outlet throttle bore 18 by means of the control valve element 8 rises again and presses the valve actuating element onto the valve seat. How from 2 easily recognizable, the stress on the valve seat 6 is even at the highest Pressures and pressure differences and extremely high actuating speeds of the valve actuator 4 remain low because the mass of the valve actuator 4 is considerably less than that a conventional nozzle needle.
  • valve actuator 4 it may be desirable to additionally for actuation via hydraulic pressure or differential pressure to provide the valve actuator 4 by spring force.
  • Fig. 3 an embodiment is provided in which the spherical valve actuator 4 by means of a compression spring 24 in the closed position is held on the valve seat 6. In the closed position shown acts on Valve actuator from above the pressure force of the spring and resulting from the free cross-sectional area and the hydraulic pressure force resulting in the control chamber. opposite the closing pressure force acts on a pressure force resulting from the lower cross-sectional projection of the spherical valve actuator 4 between the valve seat 6 and the largest results in a free cross-section and the associated pressure of the high pressure in the fuel feed line equivalent.
  • the valve actuator 4 is not in the closing direction of a Compression spring is applied but against the closing direction, d. H. the compression spring would then be placed in blind hole 7.
  • FIG. 4 largely resembles the image according to FIG. 3 and differs only in that a stepped cylindrical piston instead of a ball as a valve actuator 4a is used.
  • the piston 4a acts as described above with the conical valve seat 6 together and is acted upon in the closing direction by a compression spring 24.
  • the remaining Elements of the injection nozzle correspond to the description above for FIGS. 1 to 3.
  • the axial extent of the piston 4a is only slightly larger than the diameter of the Valve seat. This causes the mass of the piston 4a and, in turn, the occurrence dynamic forces during opening and closing are kept low.

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  • 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 (5)

  1. Soupape d'injection pour l'injection intermittente de carburant dans la chambre de combustion d'un moteur à combustion interne, avec un organe de réglage de soupape (4) conduit de façon mobile en direction axiale dans la soupape d'injection entre une position fermée et une position ouverte, qui en position fermée est pressé contre un siège de soupape sensiblement conique (6) et ferme ainsi les orifices d'injection (5) se trouvant dans un corps d'injecteur (11) dans un trou borgne (7) en aval du siège de soupape (6), qui est disposé à l'extrémité inférieure d'un corps de soupape (9), et avec une chambre de commande (2) qui est en communication par au moins un orifice d'arrivée à étranglement (3) avec une conduite d'arrivée de carburant (13) sous haute pression et par un orifice de sortie à étranglement (18) avec une conduite d'évacuation sous basse pression, dans laquelle la pression dans la chambre de commande (2) peut être commandée par une vanne-pilote actionnée par voie électromagnétique et l'organe de réglage de soupape est actionné en fonction de la pression de la chambre de commande,
    caractérisée en ce que
    a) dans le corps d'injecteur (11) est disposé un support de l'organe de réglage de soupape (14), qui s'étend par son extrémité inférieure jusqu'à proximité immédiate du siège de soupape (6),
    b) l'organe de réglage de soupape (4) est guidé dans l'extrémité inférieure du support de l'organe de réglage de soupape (14) en autorisant le mouvement de réglage, et
    c) la chambre de commande (2) est menée sous la forme d'un alésage dans le support de l'organe de réglage de soupape (14) jusqu'à l'organe de réglage de soupape (4) et met celui-ci sous pression.
  2. Soupape d'injection suivant la revendication 1, caractérisée en ce que l'organe de réglage de soupape est une bille.
  3. Soupape d'injection suivant la revendication 1 ou 2, caractérisée en ce que le support de l'organe de réglage de soupape est centré dans le siège de soupape (6) à son extrémité inférieure.
  4. Soupape d'injection suivant l'une quelconque des revendications 1 à 3, caractérisée en ce que l'organe de réglage de soupape est en outre soumis à un ressort de pression dans le sens de la fermeture.
  5. Soupape d'injection suivant les revendications 1, 3 ou 4, caractérisée en ce que l'organe de réglage de soupape présente la forme d'un piston (4a), dont la dimension en direction axiale n'est qu'imperceptiblement plus grande que le diamètre.
EP98965750A 1997-12-05 1998-12-03 Injecteur pour injection de carburant intermittente Expired - Lifetime EP1036271B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19754050A DE19754050A1 (de) 1997-12-05 1997-12-05 Einspritzventil zur intermittierenden Brennstoffeinspritzung
DE19754050 1997-12-05
PCT/EP1998/007857 WO1999030029A1 (fr) 1997-12-05 1998-12-03 Injecteur pour injection de carburant intermittente

Publications (2)

Publication Number Publication Date
EP1036271A1 EP1036271A1 (fr) 2000-09-20
EP1036271B1 true EP1036271B1 (fr) 2002-03-27

Family

ID=7850892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98965750A Expired - Lifetime EP1036271B1 (fr) 1997-12-05 1998-12-03 Injecteur pour injection de carburant intermittente

Country Status (3)

Country Link
EP (1) EP1036271B1 (fr)
DE (2) DE19754050A1 (fr)
WO (1) WO1999030029A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10058010A1 (de) 2000-11-23 2002-05-29 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10061571B4 (de) * 2000-12-11 2007-03-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102008000702A1 (de) 2008-03-17 2009-09-24 Robert Bosch Gmbh Injektor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH495504A (de) 1968-08-28 1970-08-31 Sopromi Soc Proc Modern Inject Brennstoff-Einspritzventil mit elektromagnetischer Betätigung
FR2580728B1 (fr) * 1985-04-19 1989-05-05 Alsacienne Constr Meca Systeme d'injection de combustible pour moteur diesel
IT1261149B (it) * 1993-12-30 1996-05-09 Elasis Sistema Ricerca Fiat Valvola di dosaggio per il comando dell'otturatore di un iniettore di combustibile

Also Published As

Publication number Publication date
DE19754050A1 (de) 1999-07-15
WO1999030029A1 (fr) 1999-06-17
EP1036271A1 (fr) 2000-09-20
DE59803566D1 (de) 2002-05-02

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