EP1797314B1 - Injecteur pour injecter du carburant sur un moteur a combustion interne - Google Patents

Injecteur pour injecter du carburant sur un moteur a combustion interne Download PDF

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Publication number
EP1797314B1
EP1797314B1 EP05766805A EP05766805A EP1797314B1 EP 1797314 B1 EP1797314 B1 EP 1797314B1 EP 05766805 A EP05766805 A EP 05766805A EP 05766805 A EP05766805 A EP 05766805A EP 1797314 B1 EP1797314 B1 EP 1797314B1
Authority
EP
European Patent Office
Prior art keywords
bore
filter
fuel
fuel line
injector
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.)
Not-in-force
Application number
EP05766805A
Other languages
German (de)
English (en)
Other versions
EP1797314A1 (fr
Inventor
Andreas Wengert
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 EP1797314A1 publication Critical patent/EP1797314A1/fr
Application granted granted Critical
Publication of EP1797314B1 publication Critical patent/EP1797314B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet

Definitions

  • the invention is based on an injector for fuel injection in an internal combustion engine according to the preamble of claim 1.
  • Such an injector is through the DE 100 57 683 A known.
  • This injector has an injector body, on which a fuel line is closed, is supplied from the high-pressure fuel from a memory to the injector.
  • a bore is provided in the injector body into which a fuel filter is inserted, through which the fuel supplied through the fuel line flows prior to injection.
  • a sealing seat is formed in the filter bore against which the end region of the fuel line is pressed when it is fastened to the injector body.
  • the sealing seat and the end region of the fuel line are arranged with their longitudinal axis at least approximately coaxial with the filter bore.
  • the position of the filter bore in the injector body must be selected depending on the space available in the injector body, in which case the position of the end region of the fuel line is fixed and can not be optimally selected depending on the space available in the vicinity of the injector.
  • an unfavorable installation position of the end region of the fuel line can result, in which case a large structural height can result, in particular in the longitudinal direction of the injector, whereby the installation of an internal combustion engine equipped with the injector in a motor vehicle can be made more difficult.
  • the aim is to keep the overall height of the internal combustion engine low in order to achieve a sufficient deformation path of the engine hood of the motor vehicle over the internal combustion engine, as it is necessary to meet future requirements for pedestrian protection.
  • the injector according to the invention with the features of claim 1 has the advantage that the position of the connection of the fuel line can be selected independently of the position of the filter bore in the injector body.
  • the fuel filter can be used in a simple manner in the filter hole, as it opens on the outside of the injector and the inclined to the longitudinal axis of the filter bore arranged sealing seat can be edited by the further bore in a simple manner.
  • the sealing seat and the end region of the fuel line can be arranged arbitrarily inclined to the longitudinal axis of the filter bore, so that they can be optimally adapted to the available space.
  • FIG. 1 a fuel injection device for an internal combustion engine in a schematic representation
  • FIG. 2 in enlarged Depicting a in FIG. 1 labeled II section of an injector of the fuel injection device according to a first embodiment
  • FIG. 3 the detail II of the injector according to a second embodiment
  • FIG. 4 the section II of the injector with an opposite FIG. 3 modified version.
  • FIG. 1 a fuel injection device for an internal combustion engine of a motor vehicle is shown.
  • the internal combustion engine is preferably a self-igniting internal combustion engine and has a plurality of cylinders.
  • the fuel injection device has a feed pump 10, is conveyed by the fuel from a reservoir 12 to a high-pressure pump 14.
  • fuel is conveyed under high pressure in a high-pressure accumulator 16.
  • injectors 20 are connected via high pressure lines.
  • Each injector 20 has a control valve 22, by means of which a likewise a part of the injector 20 forming fuel injection valve 24 can be opened to a fuel injection or can be closed to complete a fuel injection.
  • the control valves 22 of the injectors 20 are connected to an electronic control device 26 and are driven by them depending on operating parameters of the internal combustion engine.
  • the injector 20 has a multipart injector body 28 in which the fuel injection valve 24 is arranged at its end region facing the combustion chamber of the cylinder.
  • the fuel injection valve 24 has at least one injection valve member 30, which in a Bore 32 is slidably guided.
  • the injection valve member 30 at least one, preferably a plurality of injection openings 34 distributed over the circumference of the injector 20 is controlled at the end of the injector body 28 projecting into the combustion chamber.
  • the injection valve member 30 has, at its end region facing the combustion chamber, an approximately conical sealing surface 36, for example, which cooperates with an approximately cone-shaped valve seat 38 formed in the injector body 28 in the end region facing the combustion chamber, from which or after which the injection openings 34 are discharged.
  • annular space 40 is present between the injection valve member 30 and the bore 32 toward the valve seat 38, which merges in its end region remote from the valve seat 38 by a radial widening of the bore 32 into a pressure chamber 42 surrounding the injection valve member 30.
  • the injection valve member 30 has at the level of the pressure chamber 42 by a cross-sectional reduction to its sealing surface 36 toward a pressure shoulder 44.
  • a prestressed closing spring 46 At the end remote from the combustion chamber of the injection valve member 30 engages a prestressed closing spring 46, through which the injection valve member 30 is pressed with its sealing surface 36 toward the valve seat 38.
  • a control chamber 48 is formed in the injector body 28, which is delimited by the injection valve member 30 or a control piston 50 connected thereto, a force being generated in the closing direction on the injection valve member 30 by the pressure prevailing in the control chamber 48.
  • the high-pressure line 18 is connected to the injector body 28 and within the injector 28 leads an inlet bore 52 to the pressure chamber 42.
  • the control chamber 48 is also connected to the inlet bore 52 and also has a controlled by the control valve 22 connection 54 with a discharge area, the For example, a return to the reservoir 12 is.
  • connection 54 of the control chamber 48 with the discharge area so prevails in the control chamber 48 high pressure as in the pressure chamber 42, so that the injection valve member 30 remains in its closed position and no fuel injection.
  • the control valve 22 is opened so that it is the connection 54 of the control chamber 48 is opened with the discharge area, the control chamber 48 is relieved and the injection valve member 30 opens due to acting in the pressure chamber 42 on the pressure shoulder 44 high pressure, so that fuel is injected .
  • the control valve 22 may include an electromagnetic actuator or a piezoelectric actuator.
  • FIG. 2 the injector 20 is shown enlarged in sections according to a first embodiment, in particular, the connection of the fuel line 18 can be seen.
  • a bore 60 is provided, which opens on the outside of the injector body 28.
  • the bore 60 may extend with its longitudinal axis 61, for example approximately parallel to the longitudinal axis of the injection valve member 30 or slightly inclined to the longitudinal axis of the injection valve member 30, as shown in FIG FIG. 2 is shown.
  • a rod-shaped fuel filter 64 is used, so that the bore 60 is referred to below as a filter bore.
  • the filter bore 60 is connected to the pressure bore 42 and the control chamber 48 leading inlet bore 52.
  • a sealing seat 66 is provided, which is formed at a cross-sectional reduction of the filter bore 60, wherein the filter bore 60 has an inner bore portion 62 of small diameter, in which the fuel filter 64 is disposed, and a outer bore portion 63 of larger diameter, which opens at the outside of the injector body 28.
  • the two bore sections 62 and 63 may also have the same diameter.
  • the sealing seat 66 is formed, for example, at least approximately frusto-conical and its longitudinal axis 67 extends inclined to the longitudinal axis 61 of the filter bore 60th
  • a further bore 68 opening out on the outside thereof, which extends at least approximately coaxially with the sealing seat 66 and into which the end region of the fuel line 18 dips.
  • the bore 68 is provided with an internal thread 69.
  • a thickening 70 is provided, on the outer shell of a sealing seat 66 to the abutting sealing surface 72 is arranged, which may be at least approximately frusto-conical corresponding to the sealing seat 66 or, for example, at least approximately spherical.
  • an annular shoulder 74 is formed on the side facing away from the sealing surface 72 of the thickening 70 of the fuel line 18.
  • a hollow screw 76 is arranged, whose inner diameter is smaller than the outer diameter of the thickening 70 of the fuel line 18.
  • the hollow screw 76 is screwed with its external thread 77 in the internal thread 69 of the bore 68 of the injector body 28.
  • the hollow screw 76 comes with its end face in the axial direction of the annular shoulder 74 of the thickening 70 of the fuel line 18 to the system, whereby the thickening 70 is pressed with its sealing surface 72 against the sealing seat 66.
  • the hollow screw 76 is provided at its protruding from the bore 68 end, for example with a hexagonal profile 78 or a splined profile on which a tool can be attached to secure the hollow screw 76.
  • the outer bore portion 63 of the filter bore 60 is separated from the inner bore portion 62, wherein only the inner bore portion 62, in which the fuel filter 64 is disposed, is subjected to high pressure, the seal by the against the sealing seat 66 pressed fuel line 18 takes place.
  • the position of the further bore 68 and the sealing seat 66 can be selected independently of the position of the filter bore 60 depending on the space available.
  • the injector 20 is shown in sections according to a second embodiment, in which the basic structure is the same as in the first embodiment.
  • the further bore 68 into which the end region of the fuel line 18 dips, is formed in a protruding from the injector body 28 stub 80 which is provided with an external thread 81.
  • the filter bore 60 penetrates the nozzle 80 of the injector body 28.
  • the thickening 70 is arranged, which has the sealing face 72 facing the sealing seat 66 and the annular shoulder 74 facing away from the latter.
  • a sleeve 82 is arranged, whose inner diameter is smaller than the outer diameter of the thickening 70, so that the sleeve 82 comes with its front side in the axial direction of the annular shoulder 74 of the thickening 70 for conditioning.
  • the sleeve 82 dips into the bore 68 together with the end portion of the fuel line 18.
  • a sleeve 82 surrounding the union nut 84 is arranged, which has at one end a smaller inner diameter than the outer diameter of the sleeve 82, so that the union nut 84 on the sleeve 82 in the axial direction Plant comes.
  • the union nut 84 is screwed with its internal thread 85 on the external thread 81 of the nozzle 80 on the injector body 28 and has on its outer shell, for example, a hexagonal profile 86 to which a tool can be attached. Also in the second embodiment, by the end portion of the fuel passage 18 immersed in the bore 68, the outer bore portion 63 of the filter bore 60 is separated from the inner bore portion 62, with only the inner bore portion 62 in which the fuel filter 64 is pressurized, and its Seal by the pressed against the sealing seat 66 fuel line 18 takes place.
  • the injector 20 is fragmentary according to one opposite FIG. 3 shown slightly modified embodiment, wherein the thickening 70 at the end region of the fuel line 18 has a substantially greater extent in the direction of the longitudinal axis of the fuel line 18.
  • the thickening 70 extends to the end of the nozzle 80, so that the coupling nut 84 can act directly on the annular shoulder 74 of the thickening 70 and the sleeve 82 of the embodiment according to FIG. 3 can be omitted.
  • a relief fuel line 90 can be connected to the injector body 28, at least indirectly discharging fuel discharged from the control chamber 48 when the control valve 22 is open.
  • 28 electrical lines 92 are connected to the injector body for contacting the electrical actuator of the control valve 22nd

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

Claims (5)

  1. Injecteur pour injecter du carburant dans un moteur à combustion interne, ayant un corps d'injecteur (28) relié à une conduite de carburant (18) fournissant du carburant à haute pression,
    le corps d'injecteur (28) comportant un perçage à filtre (60) logeant un filtre à carburant (64) traversé par le carburant fourni,
    le perçage à filtre (60) formant un siège d'étanchéité (66) par rapport à l'extrémité (70) de la conduite de carburant (18) lorsque celle-ci est pressée dans le corps d'injecteur (28) pour sa fixation,
    caractérisé en ce que
    le perçage à filtre (60) débouche sur le côté extérieur du corps d'injecteur (28),
    l'axe longitudinal (67) du siège d'étanchéité (66) est incliné par rapport à l'axe longitudinal (61) du perçage à filtre (60),
    le corps d'injecteur (28) a un perçage (68) au moins sensiblement coaxial au siège d'étanchéité (66) dans lequel pénètre la région d'extrémité de la conduite de carburant (18),
    la région d'extrémité de la conduite de carburant (18) pénétrant dans le perçage (68) sépare une région d'extrémité (63) extérieure débouchant sur le côté extérieur du corps d'injecteur (28) du perçage à filtre (60) par rapport à une région d'extrémité (62) intérieure soumis à la haute pression du perçage à filtre (60) et
    le filtre à carburant (64) est logé dans la région d'extrémité intérieure (62) du perçage à filtre (60).
  2. Injecteur selon la revendication 1,
    caractérisé en ce que
    le perçage (68) comporte un filetage intérieur (69) et
    une vis creuse (76) est prévue dans la région d'extrémité de la conduite de carburant (18), cette vis étant vissée par son filetage extérieur (77) dans le filetage intérieur (69) du perçage (68) en pressant l'extrémité (70) de la conduite de carburant (18) contre le siège d'étanchéité (66).
  3. Injecteur selon la revendication 1,
    caractérisé en ce que
    le perçage (68) passe dans un ajutage (80) en saillie du corps d'injecteur (28), cet ajutage ayant un filetage extérieur (81) et
    un écrou-chapeau (84) est prévu sur la région d'extrémité de la conduite de carburant, étant vissé par son filetage intérieur (85) sur le filetage extérieur (81) de l'ajutage (80) en pressant au moins indirectement l'extrémité (70) de la conduite de carburant (18) contre le siège d'étanchéité (66).
  4. Injecteur selon la revendication 3,
    caractérisé en ce que
    la zone d'extrémité de la conduite de carburant (18) dans l'écrou-chapeau (84) a un manchon (82) pénétrant dans le perçage (68) contre lequel l'écrou-chapeau (84) vient en appui dans la direction axiale et par lequel l'extrémité (70) de la conduite de carburant (18) est pressée contre le siège d'étanchéité (66).
  5. Injecteur selon la revendication 3 ou 4,
    caractérisé en ce que
    le perçage de filtre (60) traverse l'ajutage (80) du corps d'injecteur (28).
EP05766805A 2004-09-28 2005-07-18 Injecteur pour injecter du carburant sur un moteur a combustion interne Not-in-force EP1797314B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004046888A DE102004046888A1 (de) 2004-09-28 2004-09-28 Injektor zur Kraftstoffeinspritzung an einer Brennkraftmaschine
PCT/EP2005/053430 WO2006034890A1 (fr) 2004-09-28 2005-07-18 Injecteur pour injecter du carburant sur un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1797314A1 EP1797314A1 (fr) 2007-06-20
EP1797314B1 true EP1797314B1 (fr) 2008-04-16

Family

ID=34972640

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05766805A Not-in-force EP1797314B1 (fr) 2004-09-28 2005-07-18 Injecteur pour injecter du carburant sur un moteur a combustion interne

Country Status (7)

Country Link
US (1) US7878427B2 (fr)
EP (1) EP1797314B1 (fr)
JP (1) JP4532557B2 (fr)
AT (1) ATE392547T1 (fr)
DE (2) DE102004046888A1 (fr)
ES (1) ES2302217T3 (fr)
WO (1) WO2006034890A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006019308A1 (de) * 2006-04-26 2007-10-31 Robert Bosch Gmbh Injektor
EP2090772B1 (fr) * 2008-02-15 2012-04-25 Continental Automotive GmbH Ensemble de couplage
DE102008002528A1 (de) * 2008-06-19 2009-12-24 Robert Bosch Gmbh Kraftstoff-Injektor
AT509177B1 (de) * 2009-11-23 2013-09-15 Bosch Gmbh Robert Druckrohrstutzen für common-rail-einspritzsystem
JP5218583B2 (ja) * 2011-03-09 2013-06-26 株式会社デンソー インジェクタ

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897800A (en) * 1956-05-18 1959-08-04 Continental Motors Corp Fuel injection nozzle construction and mounting
US4111370A (en) * 1977-04-08 1978-09-05 Caterpillar Tractor Co. Fuel inlet fitting for a fuel injection nozzle
US4266728A (en) * 1978-12-22 1981-05-12 Ambac Industries, Incorporated Leakless fuel injection nozzle and holder assembly
DE3122883A1 (de) * 1981-06-10 1983-01-05 Volkswagenwerk Ag, 3180 Wolfsburg "kraftstoffeinspritzanlage fuer eine brennkraftmaschine"
DE4005774A1 (de) * 1990-02-23 1991-08-29 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE19524520A1 (de) * 1995-07-05 1997-01-09 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP3584554B2 (ja) * 1995-07-26 2004-11-04 株式会社デンソー 蓄圧式燃料噴射装置
DE19547423B4 (de) * 1995-12-19 2008-09-18 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19608608A1 (de) * 1996-03-06 1997-09-11 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19832940A1 (de) * 1998-07-22 2000-01-27 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
GB9823028D0 (en) * 1998-10-22 1998-12-16 Lucas Ind Plc Fuel injector
DE19850390A1 (de) * 1998-11-02 2000-05-04 Bosch Gmbh Robert Haltekörper für ein Kraftstoffeinspritzventil für Brennkraftmaschinen
GB9824272D0 (en) * 1998-11-06 1998-12-30 Lucas Ind Plc Filter
DE10002715A1 (de) * 2000-01-22 2001-07-26 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen und ein Verfahren zur Herstellung desselben
US6729554B2 (en) * 2000-10-05 2004-05-04 Denso Corporation Structure of fuel injector for avoiding injection of excess quantity of fuel
DE10057683B4 (de) * 2000-11-21 2005-10-06 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung
ES2256333T3 (es) * 2000-11-23 2006-07-16 Robert Bosch Gmbh Valvula magnetica para controlar una valvula de inyeccion de un motor de combustion interna.
ITTO20010969A1 (it) * 2001-10-12 2003-04-12 C R F Societa Con Sortile Per Perfezionamenti ad un iniettore di combustibile per motori endotermici, avente una valvola di dosaggio elettromagnetica.
US6719224B2 (en) * 2001-12-18 2004-04-13 Nippon Soken, Inc. Fuel injector and fuel injection system
JP3882661B2 (ja) * 2002-04-05 2007-02-21 株式会社デンソー 燃料噴射装置
ITBO20030678A1 (it) * 2003-11-14 2005-05-15 Magneti Marelli Powertrain Spa Iniettore di carburante con attuazione idraulica dello spillo

Also Published As

Publication number Publication date
ES2302217T3 (es) 2008-07-01
US20080093481A1 (en) 2008-04-24
ATE392547T1 (de) 2008-05-15
DE102004046888A1 (de) 2006-03-30
WO2006034890A1 (fr) 2006-04-06
DE502005003776D1 (de) 2008-05-29
EP1797314A1 (fr) 2007-06-20
JP4532557B2 (ja) 2010-08-25
US7878427B2 (en) 2011-02-01
JP2008514856A (ja) 2008-05-08

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