EP1402176A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP1402176A1
EP1402176A1 EP02742710A EP02742710A EP1402176A1 EP 1402176 A1 EP1402176 A1 EP 1402176A1 EP 02742710 A EP02742710 A EP 02742710A EP 02742710 A EP02742710 A EP 02742710A EP 1402176 A1 EP1402176 A1 EP 1402176A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
fuel
valve
valve seat
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.)
Granted
Application number
EP02742710A
Other languages
German (de)
English (en)
Other versions
EP1402176B1 (fr
Inventor
Günter DANTES
Detlef Nowak
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 EP1402176A1 publication Critical patent/EP1402176A1/fr
Application granted granted Critical
Publication of EP1402176B1 publication Critical patent/EP1402176B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical 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
    • F02M61/04—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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • a fuel injection system for a mixture-compressing, spark-ignition internal combustion engine which comprises a fuel injection valve, which injects fuel into a combustion chamber formed by a piston / cylinder construction, and is provided with a spark plug projecting into the combustion chamber.
  • the fuel injector is provided with at least one row of injection holes distributed over the circumference of the fuel injector.
  • a disadvantage of the fuel injector known from the abovementioned publication is, in particular, the " coking of the spray orifices, which thereby block and inadmissibly reduce the flow through the fuel injector. This leads to malfunctions of the internal combustion engine.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that a flame protection screen arranged downstream of the spray orifices reduces the temperature of the flame front of the burning mixture cloud in the area of the spray orifices so much that no fuel can be deposited on the valve seat body, as a result of which the spray orifices increase is avoided by coking residues.
  • the flame retardant screen is advantageously made from a wire mesh which is attached to the valve seat body by means of a fastening ring.
  • the flame retardant screen can also be made from sheet metal, which can be provided with openings by drilling, punching or etching.
  • fastening ring axially projects beyond the flame protection screen in a fuel outflow direction, since the flame protection screen is thereby shielded from the flow circulating in the combustion chamber and fuel cannot be deposited on the flame protection screen.
  • Fig. 1 shows a schematic section through an embodiment of an inventive designed fuel injector s in an overall view
  • Fig. 2 shows a schematic section through the spray-side part of the shown in Fig. 1
  • Fig. 3 is a plan view of the flame protection screen with viewing direction III in Fig. 2 and
  • Fig. 4 is a plan view of the flame retardant screen with viewing direction IV in Fig. 2 according to a modified embodiment.
  • Fig. 1 shows an exemplary sectional view of an embodiment of an inventive
  • Fuel injection valve 1 is designed in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
  • the fuel injector 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is, for example, operatively connected via a weld seam 41 to a valve closing body 4, which cooperates with a valve seat surface 6 arranged on a valve seat body 5 to form a sealing seat.
  • the fuel injection valve 1 is an inward opening fuel injection valve 1 which has two spray openings 7.
  • the valve closing body 4 of the fuel injector 1 designed according to the invention has an almost spherical shape. As a result, an offset-free, cardanic valve needle guide is achieved, which ensures that fuel injector 1 functions exactly.
  • the valve seat body 5 of the fuel injection valve 1 is, for example, pot-shaped and, due to its shape, contributes to the valve needle guidance.
  • the valve seat body 5 is inserted into an injection-side recess 34 in the nozzle body 2 and is connected to the nozzle body 2 by means of a weld seam 35.
  • the nozzle body 2 is a seal 8 against an outer pole 9 acting as an actuator for the valve needle 3
  • the solenoid 10 is in one
  • the inner pole 13 and the outer pole 9 are separated from one another by a gap 26 and are supported on one
  • the solenoid 10 is a
  • Line 19 is excited by an electrical current that can be supplied via an electrical plug contact 17.
  • the plug contact 17 is surrounded by a plastic sheath 18, which can be molded onto the inner pole 13.
  • the valve needle 3 is guided in a valve needle guide 14, which is disc-shaped.
  • a paired adjusting disk 15 is used for stroke adjustment.
  • An armature 20 is located on the other side of the adjusting disk 15. This armature is non-positively connected via a first flange 21 to the valve needle 3, which is connected to the first flange 21 by a weld seam 22.
  • a restoring spring 23 is supported on the first flange 21, which in the present design of the fuel injector 1 is preloaded by a sleeve 24.
  • a second flange 31 is arranged on the downstream side of the armature 20 and serves as a lower armature stop. It is non-positively connected to the valve needle 3 via a weld seam 33.
  • An elastic intermediate ring 32 is arranged between the armature 20 and the second flange 31 for damping armature bumpers when the fuel injector 1 closes.
  • Fuel channels 30a and 30b run in the valve needle guide 14 and in the armature 20.
  • the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25. Grindings 36 take over the fuel supply to the sealing seat in the area of the valve seat support 5.
  • the fuel injector 1 is sealed by a seal 28 against a distribution line, not shown.
  • the fuel injection valve 1 on the valve seat body 5 which is arranged in a recess 34 of the nozzle body 2 and is connected to it, for example, by means of a weld seam 35, has a flame protection screen 37, which is attached downstream of the spray openings 7 by means of a fastening ring 38. Its arrangement on the outflow side of the spray openings 7 reduces the tendency to coke and thus prevents malfunctions of the fuel injector 1 by clogging the spray openings 7 and an impermissible reduction in the fuel flow.
  • the spray-side part of the fuel injection valve 1 with the measures according to the invention is shown and explained in more detail in FIG. 2.
  • the first flange 21 on the valve needle 3 is acted upon by the return spring 23 against a lifting direction in such a way that the valve closing body 4 on the valve seat 6 is held in sealing contact.
  • the armature 20 rests on the intermediate ring 32, which is supported on the second flange 31.
  • the magnetic coil 10 When the magnetic coil 10 is excited, it builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction.
  • the armature 20 takes the first flange 21, which is welded to the valve needle 3, and thus also the valve needle 3 in the lifting direction.
  • the valve closing body 4, which is operatively connected to the valve needle 3, lifts off from the valve seat surface 6, as a result of which the fuel is sprayed off at the spray openings 7.
  • the armature 20 drops from the inner pole 13 after the magnetic field has been sufficiently reduced by the pressure of the return spring 23 on the first flange 21, as a result of which the valve needle 3 moves counter to the stroke direction.
  • the valve closing body 4 rests on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • the armature 20 rests on the armature stop formed by the second flange 31.
  • FIG. 2 shows an excerpted sectional illustration of the section designated II in FIG. 1 from the exemplary embodiment of a fuel injector 1 designed according to the invention shown in FIG. 1.
  • the valve seat body 5 in the exemplary embodiment has a fastening ring 38 on an outer end face 39 facing the combustion chamber, which is not shown, by means of which a flame protection screen 37 is fixed on the downstream side of the valve seat body 5.
  • the fastening ring can, for example, be fixed to the valve seat body 5 by means of a weld seam 40 and is supported on a shoulder 43 of the valve seat body 5.
  • the coking of the spray openings 7 can be reduced by the arrangement of the flame protection screen 37 on the outflow side of the spray openings 7. Since the diameter of the spray openings 7 is typically approximately 100 ⁇ m, there is a risk that the spray openings 7 will clog over time due to coking and thus the flow rate is inadmissible is severely restricted, relatively large. This is due in particular to the high temperatures when the mixture cloud injected into the combustion chamber is ignited, since components of the fuel settle at the tip of the fuel injection valve 1. By attaching the flame protection screen 37, the surface temperature in the outlet area of the spray openings 7 can be reduced to such an extent that the spray openings 7 cannot grow over due to coking residues.
  • the flame protection screen 37 which thus has the function of a flame protection, thereby prevents the flame front from spreading in the area between the flame protection screen 37 and the valve seat body 5.
  • the above-mentioned flame protection function of the flame protection screen 37 can be supported by a corresponding shaping of the valve seat body 5 and the fastening ring 38.
  • the flame retardant screen closes the outlet area of the spray openings 7 from the combustion chamber, as a result of which a spray area 44 is delimited from the latter.
  • the fastening ring 38 is shaped in such a way that it continues the shape of the valve seat body 5 in the area of the spraying area 44 in the spraying direction, so that overall a funnel-shaped shape of the spraying area results.
  • the mounting ring 38 projects beyond the flame retardant screen 37 in the axial direction, so that in addition to the flame retardant function of the flame retardant screen 37, the mounting ring 38 also has a shielding function against the downstream end 42 of the fuel injector 1, since it protects the flame retardant screen 37 against the combustion chamber currents, which are tangent to the Circulate fuel injector 1 in the combustion chamber, shields.
  • the flame retardant screen 37 preferably consists, as shown in FIG. 3, of a mesh of metal wires, but it is also conceivable to use a correspondingly shaped sheet, such as shown in Fig. 4, for example by means of drilling, punching or etching with openings.
  • the invention is not limited to the exemplary embodiments shown and can be used for any construction of fuel injection valves 1.

Abstract

L'invention concerne une soupape d'injection de carburant (1) destinée à des systèmes d'injection de carburant de moteurs à combustion interne, comportant un actionneur, un pointeau de soupape (3) pouvant être actionné par l'actionneur pour l'actionnement d'un obturateur de soupape (4) formant un siège d'étanchéité avec une surface de siège de soupape (6) conçue sur un corps de siège de soupape (5), et au moins un orifice d'injection (7) conçu dans le corps de siège de soupape (5). Une extrémité côté aval (42) de la soupape d'injection de carburant (1) comporte un tamis pare-flammes (37) protégeant les orifices d'injection (7) contre la chambre de combustion du moteur à combustion interne.
EP02742710A 2001-06-22 2002-05-07 Soupape d'injection de carburant Expired - Lifetime EP1402176B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10130206A DE10130206A1 (de) 2001-06-22 2001-06-22 Brennstoffeinspritzventil
DE10130206 2001-06-22
PCT/DE2002/001629 WO2003001053A1 (fr) 2001-06-22 2002-05-07 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1402176A1 true EP1402176A1 (fr) 2004-03-31
EP1402176B1 EP1402176B1 (fr) 2005-04-27

Family

ID=7689116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02742710A Expired - Lifetime EP1402176B1 (fr) 2001-06-22 2002-05-07 Soupape d'injection de carburant

Country Status (6)

Country Link
US (1) US7014129B2 (fr)
EP (1) EP1402176B1 (fr)
JP (1) JP2004521254A (fr)
KR (1) KR100853642B1 (fr)
DE (2) DE10130206A1 (fr)
WO (1) WO2003001053A1 (fr)

Families Citing this family (17)

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Publication number Priority date Publication date Assignee Title
DE10314670A1 (de) * 2003-04-01 2004-10-14 Robert Bosch Gmbh Verfahren zur Herstellung und Befestigung einer Lochscheibe
US7124963B2 (en) * 2004-11-05 2006-10-24 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
JP4511960B2 (ja) * 2005-01-26 2010-07-28 株式会社ケーヒン 燃料噴射弁
JP4502829B2 (ja) * 2005-01-27 2010-07-14 株式会社ケーヒン 燃料噴射弁
JP4502828B2 (ja) * 2005-01-27 2010-07-14 株式会社ケーヒン 燃料噴射弁
JP4490840B2 (ja) * 2005-01-28 2010-06-30 株式会社ケーヒン 燃料噴射弁
US20090057446A1 (en) * 2007-08-29 2009-03-05 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7669789B2 (en) * 2007-08-29 2010-03-02 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US20090090794A1 (en) * 2007-10-04 2009-04-09 Visteon Global Technologies, Inc. Low pressure fuel injector
US9822969B2 (en) * 2010-11-30 2017-11-21 General Electric Company Fuel injector having tip cooling
JP5494824B2 (ja) * 2010-12-20 2014-05-21 トヨタ自動車株式会社 燃料噴射弁
US20140116391A1 (en) * 2012-10-31 2014-05-01 Electro-Motive Diesel, Inc. Fuel system having an injector blocking member
JP5983795B2 (ja) * 2015-02-09 2016-09-06 株式会社デンソー 燃料噴射弁
DE102015225055A1 (de) * 2015-12-14 2017-06-14 Robert Bosch Gmbh Kraftstoffinjektor
DE102015226769A1 (de) * 2015-12-29 2017-06-29 Robert Bosch Gmbh Brennstoffeinspritzventil
GB2552673B (en) * 2016-08-02 2020-02-19 Delphi Tech Ip Ltd SCR doser spray atomization
US10865754B2 (en) * 2017-04-05 2020-12-15 Progress Rail Services Corporation Fuel injector having needle tip and nozzle body surfaces structured for reduced sac volume and fracture resistance

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US4030668A (en) * 1976-06-17 1977-06-21 The Bendix Corporation Electromagnetically operated fuel injection valve
CN1050649C (zh) 1993-12-21 2000-03-22 罗伯特·博施有限公司 雾化筛网及具有雾化筛网的燃油喷射阀
DE4435270A1 (de) 1994-10-01 1996-04-04 Bosch Gmbh Robert Brennstoffeinspritzvorrichtung
US5765750A (en) * 1996-07-26 1998-06-16 Siemens Automotive Corporation Method and apparatus for controlled atomization in a fuel injector for an internal combustion engine
DE19804463B4 (de) 1998-02-05 2006-06-14 Daimlerchrysler Ag Kraftstoffeinspritzsystem für Ottomotoren
DE19900231A1 (de) 1999-01-07 2000-07-20 Deutsch Zentr Luft & Raumfahrt Verbrennungsmotor
DE10130685A1 (de) * 2001-06-26 2003-01-02 Bosch Gmbh Robert Brennstoffeinspritzventil

Non-Patent Citations (1)

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Title
See references of WO03001053A1 *

Also Published As

Publication number Publication date
KR20030023760A (ko) 2003-03-19
WO2003001053A1 (fr) 2003-01-03
US7014129B2 (en) 2006-03-21
DE50202925D1 (de) 2005-06-02
JP2004521254A (ja) 2004-07-15
EP1402176B1 (fr) 2005-04-27
KR100853642B1 (ko) 2008-08-25
US20040099243A1 (en) 2004-05-27
DE10130206A1 (de) 2003-02-06

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