WO2009016004A1 - Injecteur de carburant avec une douille de centrage reposant sur le siège de soupape conique d'une aiguille d'injecteur comme guidage pour l'aiguille d'injecteur - Google Patents

Injecteur de carburant avec une douille de centrage reposant sur le siège de soupape conique d'une aiguille d'injecteur comme guidage pour l'aiguille d'injecteur Download PDF

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Publication number
WO2009016004A1
WO2009016004A1 PCT/EP2008/058880 EP2008058880W WO2009016004A1 WO 2009016004 A1 WO2009016004 A1 WO 2009016004A1 EP 2008058880 W EP2008058880 W EP 2008058880W WO 2009016004 A1 WO2009016004 A1 WO 2009016004A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve seat
nozzle needle
fuel injector
conical valve
jet needle
Prior art date
Application number
PCT/EP2008/058880
Other languages
German (de)
English (en)
Inventor
Thomas Pauer
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 WO2009016004A1 publication Critical patent/WO2009016004A1/fr

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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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

Definitions

  • the invention relates to a fuel injector according to the preamble of patent claim 1.
  • Known fuel injectors of this type comprise a nozzle needle which closes or releases the injection openings, and a valve piston on which the pressure prevailing in the control chamber acts.
  • the valve piston is motion coupled to the nozzle needle either directly or via a hydraulic coupler that is critical in terms of function and costs. It is also possible for transverse forces to act on the nozzle needle which lead to a jet pattern of the injected fuel that is not optimal in terms of symmetry.
  • a centering sleeve which guides the nozzle needle is seated on the same cone (conical valve seat) as the nozzle needle itself, which is thereby guided in an optimally centered manner and thus produces a spray pattern optimized in terms of symmetry.
  • the nozzle needle and the conventionally provided valve piston can advantageously be designed as a component, namely as a "long needle”.
  • the fuel injector according to the invention is shown in the drawing and explained in more detail in the following description.
  • the features shown in the figures are purely schematic and not to scale.
  • the single FIGURE shows a longitudinal section through the fuel injector according to the invention.
  • the fuel injector 1 shown in Fig. 1 is usually used in an internal combustion engine having a plurality of cylinders, wherein each of these cylinders is associated with such an injector (fuel injection valve).
  • the injector 1 has, in a manner known per se, an injector body 2 with injection openings 3 projecting into a cylinder combustion chamber of the internal combustion engine and a nozzle needle (valve needle) 5 which opens and closes the injection openings 3 as a function of the pressure in a control chamber 4.
  • the control chamber 4 is connected via an inlet throttle (Z throttle) 6 permanently connected to a high-pressure inlet line (high pressure side) 7 of the fuel.
  • a control valve 8 is provided in the form of a 2/2-way valve, the sliding control valve member 8a opens or blocks the connection of the control chamber 4 via a discharge throttle (A-throttle) 9 with a low-pressure chamber (low pressure side) 10.
  • the high-pressure inlet line 7 is connected to a high-pressure accumulator (common rail), not shown, and the low-pressure chamber 10 with a leak oil drain, not shown.
  • the control valve 8 may have as an actuator for the control valve member 8a in particular a magnetic drive or a piezoelectric actuator.
  • the nozzle needle 5 is arranged in an axial Injektorbohrung 11 of the injector body 2 to form an annular space 12 which is connected to the high pressure supply line 7.
  • the upper end 5a of the nozzle needle 5 in FIG. 1 is in one
  • Guide bore 13 of a valve member 14 of the control valve 8 is guided axially displaceable and limited in the guide bore 13 with a force acting in the closing direction of the nozzle needle 5 control surface 15 the control chamber 4.
  • the valve member 14 is fixed in the Injektorbohrung 11 by means of a valve clamping nut 16 and has the Z and A throttles 6, 9 on.
  • the nozzle needle 5 has a conical sealing surface 17 which cooperates with a conical valve seat 18 provided in the injector bore 11.
  • the injection openings 3 are arranged downstream of the cone valve seat 18.
  • the lower end 5b of the nozzle needle 5 is guided in a centering sleeve 19, which in turn is seated on the conical valve seat 18 and thereby centered.
  • the seated on the conical valve seat 18 end face of the centering sleeve 19 is conically formed with a conical surface of the conical valve seat 18 corresponding cone angle.
  • the centering sleeve 19 is pressed by a spring 20 which is arranged in the Injektorbohrung 11 and supported on the injector 2 in centered contact with the conical valve seat 18.
  • the nozzle needle 5 is guided directly above the conical valve seat 18. Since the centering sleeve 19 is seated on the same cone as the nozzle needle 5 itself, the nozzle needle 5 is optimally centered and guided without lateral force and thus produces a symmetry-optimized jet pattern of the injected fuel.
  • the injector configuration is a high-pressure hydraulic system of leak-free design, the nozzle needle 5 is force-balanced.
  • the injector 1 has a sufficiently high closing dynamics, is below the valve member 14 into the Injektorbohrung 11, a throttle plate 21 with a
  • Closing throttle 22 is installed, via which the annular space 12 and the conical valve seat 18 is connected to the high-pressure inlet line 7.
  • the throttle resistance of the closing throttle 22 is greater than the throttle resistance of the inlet throttle 6, whereby the pressure in the control chamber 4 is always greater than the pressure applied to the conical valve seat 18, resulting in a closing force.
  • On the throttle plate 22 is a
  • Closing spring 23 is supported, which biases the nozzle needle 5 in the direction of the conical valve seat 18.
  • the control valve 8 is opened and thereby the control chamber 4 is connected to the low-pressure side 10 and thus depressurized.
  • the nozzle needle 4 acts on the sealing surface 17 of the pressure prevailing in the annular space 12 fuel pressure in the opening direction, lifts off from the conical valve seat 18 and are the injection ports 3 free.
  • the control valve 8 is closed, and the pressure in the control chamber 4 increases again and thus also acting in the closing direction of the hydraulic force to the nozzle needle 5, which is thereby pressed into its closed position.
  • the injector body 2 is made in one piece. In other embodiments, not shown, the injector body may be made in several parts with a holding body, a nozzle body and a nozzle body fixed to the holding body nozzle retaining nut.

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

L'invention concerne un injecteur de carburant (1) pour moteurs à combustion qui comprend une aiguille d'injecteur (5) déplaçable de manière longitudinale coopérant avec un siège de soupape conique (18) sur lequel se trouve du carburant sous haute pression, au moins une ouverture d'injection (3), disposée en aval du siège de soupape conique (18), une chambre de commande (4) raccordée à un côté haute pression (7), sa pression permettant de commander le mouvement de l'aiguille d'injecteur (5) ainsi qu'une soupape de commande (8), qui verrouille ou ouvre la connexion de la chambre de commande (4) à un côté basse pression (10). Selon l'invention, l'aiguille d'injecteur (5) est guidée dans une douille de centrage (19) par son extrémité (5b) coopérant avec le siège de soupape conique (18), la douille de centrage elle-même reposant sur le siège de soupape conique (18).
PCT/EP2008/058880 2007-07-31 2008-07-09 Injecteur de carburant avec une douille de centrage reposant sur le siège de soupape conique d'une aiguille d'injecteur comme guidage pour l'aiguille d'injecteur WO2009016004A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710035752 DE102007035752A1 (de) 2007-07-31 2007-07-31 Kraftstoffinjektor mit einer auf dem Kegelventilsitz einer Düsennadel aufsitzenden Zentrierhülse als Führung für die Düsennadel
DE102007035752.6 2007-07-31

Publications (1)

Publication Number Publication Date
WO2009016004A1 true WO2009016004A1 (fr) 2009-02-05

Family

ID=39828936

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/058880 WO2009016004A1 (fr) 2007-07-31 2008-07-09 Injecteur de carburant avec une douille de centrage reposant sur le siège de soupape conique d'une aiguille d'injecteur comme guidage pour l'aiguille d'injecteur

Country Status (2)

Country Link
DE (1) DE102007035752A1 (fr)
WO (1) WO2009016004A1 (fr)

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197684A (en) * 1986-11-21 1988-05-25 Lucas Ind Plc I.C. engine fuel injection nozzle
JPH04252861A (ja) * 1991-01-29 1992-09-08 Nissan Motor Co Ltd 燃料噴射ノズル
JPH08296531A (ja) * 1995-04-28 1996-11-12 Nippondenso Co Ltd 燃料噴射弁
JPH11200999A (ja) * 1998-01-09 1999-07-27 Nissan Motor Co Ltd 内燃機関用燃料噴射弁
EP1088985A2 (fr) * 1999-09-29 2001-04-04 Siemens Aktiengesellschaft Injecteur de carburant pour injection directe dans un moteur à combustion interne
JP2002013454A (ja) * 2000-06-28 2002-01-18 Mitsubishi Electric Corp 燃料噴射弁の製造方法
WO2003040544A1 (fr) * 2001-11-09 2003-05-15 Siemens Aktiengesellschaft Module de commande destine a un injecteur d'un systeme d'injection de reservoir
US20040046064A1 (en) * 2002-09-09 2004-03-11 Hitachi, Ltd. Fuel injection valve and cylinder injection type internal combustion engine installing the same
DE10241360A1 (de) * 2002-09-06 2004-03-18 Siemens Ag Einspritzvorrichtung zum Einspritzen von Kraftstoff
DE10331805A1 (de) * 2003-07-14 2005-03-17 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1526274A1 (fr) * 2003-10-22 2005-04-27 Robert Bosch Gmbh Dispositif d'injection de carburant, en particulier pour un moteur à combustion interne à injection directe
JP2006002657A (ja) * 2004-06-17 2006-01-05 Nissan Motor Co Ltd 燃料噴射弁
DE102005024045A1 (de) * 2005-05-25 2006-11-30 Robert Bosch Gmbh Injektor für ein Kraftstoffeinspritzsystem
DE102005025522A1 (de) * 2005-06-03 2006-12-07 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102005030868A1 (de) * 2005-07-01 2007-01-11 Robert Bosch Gmbh Kraftstoffeinspritzventile bei Kraftmaschinen
EP1772618A1 (fr) * 1999-08-04 2007-04-11 Robert Bosch Gmbh Injecteur à rampe commune
DE102006012842A1 (de) * 2006-03-21 2007-09-27 Robert Bosch Gmbh Kraftstoffeinspritzventile für Brennkraftmaschinen

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197684A (en) * 1986-11-21 1988-05-25 Lucas Ind Plc I.C. engine fuel injection nozzle
JPH04252861A (ja) * 1991-01-29 1992-09-08 Nissan Motor Co Ltd 燃料噴射ノズル
JPH08296531A (ja) * 1995-04-28 1996-11-12 Nippondenso Co Ltd 燃料噴射弁
JPH11200999A (ja) * 1998-01-09 1999-07-27 Nissan Motor Co Ltd 内燃機関用燃料噴射弁
EP1772618A1 (fr) * 1999-08-04 2007-04-11 Robert Bosch Gmbh Injecteur à rampe commune
EP1088985A2 (fr) * 1999-09-29 2001-04-04 Siemens Aktiengesellschaft Injecteur de carburant pour injection directe dans un moteur à combustion interne
JP2002013454A (ja) * 2000-06-28 2002-01-18 Mitsubishi Electric Corp 燃料噴射弁の製造方法
WO2003040544A1 (fr) * 2001-11-09 2003-05-15 Siemens Aktiengesellschaft Module de commande destine a un injecteur d'un systeme d'injection de reservoir
DE10241360A1 (de) * 2002-09-06 2004-03-18 Siemens Ag Einspritzvorrichtung zum Einspritzen von Kraftstoff
US20040046064A1 (en) * 2002-09-09 2004-03-11 Hitachi, Ltd. Fuel injection valve and cylinder injection type internal combustion engine installing the same
DE10331805A1 (de) * 2003-07-14 2005-03-17 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1526274A1 (fr) * 2003-10-22 2005-04-27 Robert Bosch Gmbh Dispositif d'injection de carburant, en particulier pour un moteur à combustion interne à injection directe
JP2006002657A (ja) * 2004-06-17 2006-01-05 Nissan Motor Co Ltd 燃料噴射弁
DE102005024045A1 (de) * 2005-05-25 2006-11-30 Robert Bosch Gmbh Injektor für ein Kraftstoffeinspritzsystem
DE102005025522A1 (de) * 2005-06-03 2006-12-07 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102005030868A1 (de) * 2005-07-01 2007-01-11 Robert Bosch Gmbh Kraftstoffeinspritzventile bei Kraftmaschinen
DE102006012842A1 (de) * 2006-03-21 2007-09-27 Robert Bosch Gmbh Kraftstoffeinspritzventile für Brennkraftmaschinen

Also Published As

Publication number Publication date
DE102007035752A1 (de) 2009-02-05

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