EP1045977B1 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP1045977B1
EP1045977B1 EP99938137A EP99938137A EP1045977B1 EP 1045977 B1 EP1045977 B1 EP 1045977B1 EP 99938137 A EP99938137 A EP 99938137A EP 99938137 A EP99938137 A EP 99938137A EP 1045977 B1 EP1045977 B1 EP 1045977B1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
space
fuel injection
valve member
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
EP99938137A
Other languages
German (de)
English (en)
Other versions
EP1045977A1 (fr
Inventor
Roger Potschin
Friedrich Boecking
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 EP1045977A1 publication Critical patent/EP1045977A1/fr
Application granted granted Critical
Publication of EP1045977B1 publication Critical patent/EP1045977B1/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
    • F02M61/08—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 the valves opening in direction of fuel flow
    • 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
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the invention relates to a fuel injection valve for Internal combustion engines according to the preamble of the claim 1.
  • Such an injector goes for example from the DE 43 25 904 C2 and from the unpublished DE 197 16 226.6-13.
  • the fuel injector according to the invention with the Features of claim 1, however, has the Advantage that the leadership and sealing against the fuel injection valves known from the prior art is improved for internal combustion engines.
  • the order the one pressure shoulder on the distant combustion chamber End of the valve body in a fluid with the pressure chamber connected compensation room, the front through completed an axially displaceable pressure sleeve has the particularly great advantage that the compensation space is always connected to the pressure chamber. hereby it is ensured that the pressure shoulder on the one hand is always pressurized, on the other ensures that pressure differences, for example when opening the fuel injector, between the Pressure chamber and the compensation room compensated directly become.
  • the valve member is advantageously between the two Pressure shoulders needle-shaped and has one constant diameter.
  • the pressure sleeve is preferred to avoid leaks pressed onto the valve member.
  • the compensation space can be designed in any way his.
  • One particularly with regard to a simple one Manufacturing advantageous embodiment sees that the compensation chamber the pressure shoulder remote from the combustion chamber surrounds in a ring.
  • the high pressure fuel supply to the fuel injector preferably takes place from one for all fuel injection valves common high pressure storage space, which in turn can be filled using a high-pressure fuel pump is.
  • the actuator for actuating the valve member is advantageous an electromechanical actuator. It is designed in particular as a piezo actuator or electromagnet.
  • FIG. 1 An embodiment of a fuel injector for internal combustion engines, the lower, combustion chamber side Part in Fig. 1 in a schematic sectional view is shown has a valve body 10 which by means of a union nut 30 on a valve holding body 20 is axially clamped.
  • the valve body 10 has an axial guide bore 40 in which a needle-shaped valve member 50 is axially displaceable which is led to his in one (not shown) combustion chamber of the fuel to be supplied Internal combustion engine protruding lower end has valve head 52 acting as a valve closing member.
  • This valve head 52 protruding from the bore has one conical sealing surface 53 facing valve body 10 on by in the illustrated embodiment formed on the valve head 52 seat ring and that with a corresponding valve seat surface 11 on the end face of the valve body on the combustion chamber side 10 cooperates.
  • valve member 50 Between the wall of the bore 40 and part of the Shaft of the valve member 50 is a pressure chamber 12 in the valve body 10 formed, the axially each of a Valve member 50 formed pressure shoulder 54 and 55 limited is.
  • This pressure chamber 12 opens into a pressure chamber 13 enlarged volume of the pressure chamber 12 itself a supply bore 60 in a known manner.
  • the one located at the end of the pressure chamber 12 remote from the combustion chamber Pressure shoulder 55 has the same pressure application area on how that formed on the valve member head 52 pressure shoulder 54 near the combustion chamber, so that the valve member 50 is pressure balanced. This prevents that the fuel injector due to the applied Common rail pressure opens automatically.
  • the fuel injector has another additional one Attack surface acted upon by high-pressure fuel through which the pending at the injector High fuel pressure in the closing direction on the valve member 50 works.
  • This additional pressure application area is by a lower end face 71 on the combustion chamber side a pressure sleeve 70 is formed, which a compensation space 80, the pressure shoulder 55 distant from the combustion chamber in the shape of a ring surrounds and fluidly connected to the pressure chamber 12 is on its side facing away from the combustion chamber.
  • the compensation space 80 forms in this way the combustion chamber distant end of the pressure chamber 12.
  • the sleeve 70 is axially displaceable in an annular body 90 led.
  • valve member 56 As can also be seen from Fig. 1, follows the Valve member 56 another stem portion 57, the into a spring chamber provided in the valve holding body 20 22 protrudes.
  • an electromechanical actuator for example a piezo actuator or an electromagnet, an axial displacement of the valve member 50 and thus an opening of those provided in the valve member head 52 Injection opening (not shown).
  • the area between the two pressure shoulders 54 or 55 of the valve member 50 is needle-shaped with a constant Diameter formed.
  • the elasticity that this enables of the valve member 50 in particular perpendicular to Valve member axis advantageously enables Compensate for an offset between the guides of the Valve member 50 through the pressure sleeve 70 and the Valve member head 52 are formed in the central region of the needle-shaped area.

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 (6)

  1. Injecteur de carburant pour moteurs à combustion interne dans lequel :
    un corps de soupape (10) est percé d'un alésage (40) dans lequel coulisse un organe de soupape (50), présentant à son extrémité située vers la chambre de combustion une tête d'organe de soupape (52) qui constitue l'organe de fermeture de l'injecteur et qui présente, du côté du corps de soupape (10), une portée d'étanchéité (53) par laquelle elle coopère avec une portée de siège de soupape (11) prévue sur la face frontale du corps de soupape (10) située vers la chambre de combustion ,
    la tête d'organe de soupape (52) présente des orifices d'injection partant d'un espace de pression (12) compris entre l'organe de soupape (50) et la paroi de l'alésage (40) pour déboucher sur la paroi périphérique de la tête d'organe de soupape (52),
    les orifices d'injection, quand l'organe de soupape (50) est appliqué sur le siège de soupape (11) sont obturés par la paroi de l'alésage (40) et sont libérés quand l'organe de soupape (50) effectue un mouvement d'ouverture dirigé vers l'extérieur, produit par un organe de commande actionné indépendamment de la pression de carburant dans l'espace de pression (12),
    sur l'organe de soupape (50) sont prévus deux épaulements de pression (54, 55) se faisant face, délimitent axialement l'espace de pression et présentant sensiblement les mêmes surfaces d'action de la pression,
    caractérisée en ce que
    l'épaulement de pression (55) situé vers l'extrémité du corps de soupape (10) du côté de la chambre de combustion est monté dans une chambre d'équilibrage (80) qui est en liaison fluide avec la chambre de pression (12) et qui se termine frontalement par une douille de pression (70) pouvant coulisser axialement.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'organe de soupape (50), entre les deux épaulements de pression (54, 55) a la forme d'une aiguille de diamètre constant.
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    la douille de pression (70) est emmanchée en pression sur l'organe de soupape (50).
  4. Injecteur de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    la chambre d'équilibrage (80) entoure à la manière d'un anneau l'épaulement de pression (55) éloigné de la chambre de combustion.
  5. Injecteur de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    l'espace de pression (12) peut être relié à un réservoir à haute pression, alimenté de son côté par une pompe à haute pression.
  6. Injecteur de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    l'organe de commande est un organe électromécanique, de préférence un actionneur pézoélectrique ou un électro-aimant.
EP99938137A 1998-08-20 1999-06-08 Soupape d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP1045977B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19837813 1998-08-20
DE19837813A DE19837813A1 (de) 1998-08-20 1998-08-20 Kraftstoffeinspritzventil für Brennkraftmaschinen
PCT/DE1999/001660 WO2000011341A1 (fr) 1998-08-20 1999-06-08 Soupape d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP1045977A1 EP1045977A1 (fr) 2000-10-25
EP1045977B1 true EP1045977B1 (fr) 2003-09-03

Family

ID=7878158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99938137A Expired - Lifetime EP1045977B1 (fr) 1998-08-20 1999-06-08 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (5)

Country Link
US (1) US6247453B1 (fr)
EP (1) EP1045977B1 (fr)
JP (1) JP2002523672A (fr)
DE (2) DE19837813A1 (fr)
WO (1) WO2000011341A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19953562A1 (de) * 1999-11-08 2001-05-23 Bosch Gmbh Robert Kraftstoff-Einspritzdüse
US6343587B1 (en) * 2000-06-28 2002-02-05 Siemens Automotive Corporation Fuel injector armature permitting fluid and vapor flow
DE10204655A1 (de) * 2002-02-05 2003-08-28 Bosch Gmbh Robert Brennstoffeinspritzventil
DE602004003896T2 (de) 2004-01-29 2007-05-03 Siemens Vdo Automotive S.P.A., Fauglia Flüssigkeitseinspritzventil und sein Herstellungverfahren

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734737A1 (de) * 1986-10-14 1988-04-21 Orbital Eng Pty Brennstoffeinspritzsystem und mit diesem ausgeruestete verbrennungsmaschine
GB2219627B (en) * 1988-06-10 1992-10-28 Orbital Eng Pty Improvements relating to nozzles for in-cylinder fuel injection systems
US5024385A (en) * 1990-01-11 1991-06-18 Outboard Marine Corporation Internal combustion engine fuel supply system
DE4325904C2 (de) * 1993-08-02 1995-07-20 Daimler Benz Ag Für eine Dieselbrennkraftmaschine vorgesehene Kraftstoffeinspritzanlage mit einer den Kraftstoff fördernden Hochdruckpumpe in eine gemeinsame Versorgungsleitung (Common-Rail) für alle Einspritzdüsen
DE19504849A1 (de) * 1995-02-15 1996-08-22 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
US5752656A (en) * 1996-07-10 1998-05-19 Outboard Marine Corporation Nozzle assembly and method of fabrication thereof
DE19642440A1 (de) * 1996-10-15 1998-04-16 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19701288C2 (de) * 1997-01-16 1999-10-14 Daimler Benz Ag Ventil zur dosierten Abgabe von Fluiden

Also Published As

Publication number Publication date
DE59906859D1 (de) 2003-10-09
JP2002523672A (ja) 2002-07-30
US6247453B1 (en) 2001-06-19
WO2000011341A1 (fr) 2000-03-02
DE19837813A1 (de) 2000-02-24
EP1045977A1 (fr) 2000-10-25

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