EP0809017A1 - Injecteur de carburant à deux étages pour moteurs à combustion interne - Google Patents

Injecteur de carburant à deux étages pour moteurs à combustion interne Download PDF

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Publication number
EP0809017A1
EP0809017A1 EP96108193A EP96108193A EP0809017A1 EP 0809017 A1 EP0809017 A1 EP 0809017A1 EP 96108193 A EP96108193 A EP 96108193A EP 96108193 A EP96108193 A EP 96108193A EP 0809017 A1 EP0809017 A1 EP 0809017A1
Authority
EP
European Patent Office
Prior art keywords
spray
conical
fuel injection
bore
nozzle
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.)
Withdrawn
Application number
EP96108193A
Other languages
German (de)
English (en)
Inventor
Harald Ing. Schmidt
Josef Morell
Heinz Ing. Waras
Patrik Dipl.-Ing. Raffelsberger
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.)
Steyr Daimler Puch AG
Original Assignee
Steyr Daimler Puch AG
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 Steyr Daimler Puch AG filed Critical Steyr Daimler Puch AG
Priority to EP96108193A priority Critical patent/EP0809017A1/fr
Priority to JP9161768A priority patent/JPH1054330A/ja
Priority to US08/859,950 priority patent/US5934571A/en
Publication of EP0809017A1 publication Critical patent/EP0809017A1/fr
Withdrawn legal-status Critical Current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
    • F02M61/16—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
    • F02M61/1846—Dimensional characteristics of discharge orifices
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/083—Having two or more closing springs acting on injection-valve
    • 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
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent

Definitions

  • the invention relates to a fuel injection nozzle for internal combustion engines consisting of a nozzle housing ending in a nozzle tip and a nozzle needle which is guided in it and tapered at its lower end, which is resiliently pressed against a conical valve seat in the nozzle tip, which conical valve seat several of the conical end of the nozzle needle has covered spray bores and merges into a blind hole, the nozzle needle lifting off under the pressure of the supplied fuel in a first stroke phase against the force of a first spring from the valve seat and engaging a stop which in turn in a second stroke phase against the force of a second spring is displaceable, and wherein at the end of the first stroke phase the respective imaginary cylinder surface, which results in the extension of each spray bore between the conical end of the nozzle needle and the conical valve seat, is smaller than the cross-sectional area of the respective spray booth is leading to a first deflection of the fuel flow in the space between the nozzle needle and the conical valve seat and a subsequent second deflection when flowing into the spray
  • a generic injection nozzle is known from EP 413 173 B1, in which the cylinder jacket surface in the extension of each spray bore is a maximum of 0.75 times the cross-sectional area of the respective spray bore. Because of the special flow conditions caused thereby, the highest atomization was achieved with such nozzles in the first stroke phase and optimal atomization with sufficient penetration in the second stroke phase. However, there was room for further improvements in emissions and combustion noise, especially in the first lifting phase. In view of the future emission limits according to EURO III, further improvements and optimizations were also necessary. They were achieved in extensive test series and based on hydrodynamic considerations.
  • the low injection rate required in the first stroke phase requires the needle stroke to be as short as possible, which primarily results in a reduction in combustion noise.
  • This small needle stroke leads to increased pressure loss and atomization is at a maximum, which leads to increased particle emission after ignition.
  • this pressure loss also reduces penetration, which on the one hand results in a reduction in hydrocarbon emissions (HC emissions are caused by the fuel touching the wall) but on the other hand causes uneven distribution of the fuel in the combustion air and thus particle emissions.
  • an increase in the needle stroke would be preferable, but this again increases the combustion noise.
  • the surface area of the cylinder becomes particularly low, which means that the injection rate is reduced without any appreciable increase in throttle losses, but on the other hand the boundary layer flow on the walls has more influence. In order to ensure that the double deflected flow into the ejection bores would still "start” under these conditions, the specific rounding was determined.
  • the entry into the spray hole is rounded off with a radius of 8 percent to 15 percent of the diameter of the respective spray hole (claim 2). This gives particularly good results for smaller spray bores.
  • the boundary layer can be influenced further by the transition from the fillet to the conical seat surface forming an edge (claim 3).
  • This edge then forms a separation edge, which favors the formation of a double-deflected flow with minimal pressure loss.
  • the detaching edge is preferably produced by finishing the conical seat surface only after the fillet (claim 5).
  • a further improvement is achieved if the spray bores are delimited on their outlet side by a sharp edge which lies in a plane normal to the axis of the spray bore (claim 6).
  • the sharp edge again forms a tear-off edge, which ensures lossless exit.
  • the normal plane still has the effect that the emerging fuel is not deflected by an angle which is also pressure-dependent. It therefore contributes significantly to better emission values.
  • the nozzle housing 1 which is connected by a union nut 2 to the other parts of the device ends, comprising in a nozzle tip 3, the inside a conical valve seat 4 which merges with a sharp edge 5 at an angle of about 30 o in a blind hole 6 .
  • a nozzle needle 7 is guided, which is pressed resiliently against the conical valve seat 4 and also has a conical end section 8, so that the nozzle needle 7 forms a valve with its end section 8 together with the valve seat 4, which in FIG. 1 is shown in the closed position.
  • the fuel is supplied to a channel 11 by an injection pump (not shown) and reaches a collecting space 12, from where it penetrates along the nozzle needle 7 to the valve seat 4.
  • the pressure in the collecting chamber 12 exerts an upward force on the nozzle needle 7, which is initially acted on by a weaker spring 9, which is essentially of one stronger spring 10 is enclosed. If the pump pressure rises, the nozzle needle 7 or its end section 8 is lifted against the force of the spring 9 from the valve seat 4 until it lies against the surface of the stop 13. This is the first stroke phase, in which the lateral surface of the imaginary cylinder is smaller than the cross-section of the ejection bore.
  • the nozzle tip 3 has in the region of the valve seat 4 ejection bores 15 which are covered by the conical end section 8 of the nozzle needle 7 when the valve is closed.
  • This conical section 8 is delimited towards the blind hole 6 by an edge 16 which also remains at the end of the first stroke phase under the entry of the ejection bores.
  • the outer surface M of the imaginary cylinder resulting from the extension of the ejection bore 15 between its inner edge R and the surface of the conical end section 8 is only up to 30 percent of the Cross-sectional area of the ejection bore 15 and the inner edge R is now only the intersection curve of the extension of the ejection bore 15 with the inner conical surface 4 of the nozzle tip 3.
  • spherical depressions 22', 22 '' are preferably provided, the separation of which with the ejection bores 15 'and 15' 'form sharp edges 23', 23 '' which are in a normal plane to the Axes 24 ', 24' 'of the ejection bores 15' and 15 '' are located.
  • the lengths 25', 25 '' of the ejection bores 15 'and 15' ' are the same.
  • the transition from the ejection bore 15 'to the conical surface 4 is detailed in FIG.
  • the former extends with its cylindrical middle part with the diameter 26 'inwards to the connection 29' of the rounding 17 '.
  • Their radius of curvature is designated 27 'and the corresponding circular arc 30' intersects the conical surface 4 and forms an edge 28 'with it, which can, but does not have to, run all around.
  • This edge 28 ' is produced with particular accuracy and surface quality by first machining the rounding, which is indicated by the dashed extension of the circular arc 30', and only then finishing the conical surface 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP96108193A 1996-05-22 1996-05-22 Injecteur de carburant à deux étages pour moteurs à combustion interne Withdrawn EP0809017A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP96108193A EP0809017A1 (fr) 1996-05-22 1996-05-22 Injecteur de carburant à deux étages pour moteurs à combustion interne
JP9161768A JPH1054330A (ja) 1996-05-22 1997-05-16 内燃機関用燃料噴射ノズル
US08/859,950 US5934571A (en) 1996-05-22 1997-05-21 Two-stage fuel-injection nozzle for internal combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96108193A EP0809017A1 (fr) 1996-05-22 1996-05-22 Injecteur de carburant à deux étages pour moteurs à combustion interne

Publications (1)

Publication Number Publication Date
EP0809017A1 true EP0809017A1 (fr) 1997-11-26

Family

ID=8222810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96108193A Withdrawn EP0809017A1 (fr) 1996-05-22 1996-05-22 Injecteur de carburant à deux étages pour moteurs à combustion interne

Country Status (3)

Country Link
US (1) US5934571A (fr)
EP (1) EP0809017A1 (fr)
JP (1) JPH1054330A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000023707A1 (fr) * 1998-10-15 2000-04-27 Robert Bosch Gmbh Gicleur de carburant pour moteurs a combustion interne a auto-allumage
EP0890735A3 (fr) * 1997-07-11 2001-10-10 Robert Bosch Gmbh Soupape d'injection de combustible
DE10050704A1 (de) * 2000-10-13 2003-02-20 Siemens Ag Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine
EP1508689A1 (fr) * 1999-08-11 2005-02-23 Robert Bosch Gmbh Soupape d'injection de combustible
DE102009034072A1 (de) * 2009-07-22 2011-01-27 Emitec Gesellschaft Für Emissionstechnologie Mbh Einspritzdüse zur Zufuhr von Reduktionsmittel und Vorrichtung zur Behandlung von Abgasen
WO2012010657A3 (fr) * 2010-07-23 2012-06-14 Continental Automotive Gmbh Corps de buse comportant un trou borgne
EP2525077A1 (fr) * 2011-05-16 2012-11-21 Liebherr-Machines Bulle SA Buse

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19815918A1 (de) * 1998-04-09 1999-10-21 Man B & W Diesel As Brennstoffeinspritzvorrichtung
US6644565B2 (en) * 1998-10-15 2003-11-11 Robert Bosch Gmbh Fuel injection nozzle for self-igniting internal combustion engines
DE10105674A1 (de) * 2001-02-08 2002-08-29 Siemens Ag Kraftstoffeinspritzdüse für eine Brennkraftmaschine
DE10106809A1 (de) * 2001-02-14 2002-09-19 Siemens Ag Verfahren zur Herstellung eines Lochs in einem Körper, insbesondere eines Einspritzlochs in einem Kraftstoffinjektor
JP3788275B2 (ja) * 2001-06-26 2006-06-21 日産自動車株式会社 筒内直噴型内燃機関
US20040163254A1 (en) * 2002-12-27 2004-08-26 Masanori Miyagawa Method for manufacturing injection hole member
US20050150979A1 (en) * 2004-01-14 2005-07-14 General Electric Company Locomotive engine economy enhancement with improved nozzle
US7438241B2 (en) * 2004-11-05 2008-10-21 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7051957B1 (en) * 2004-11-05 2006-05-30 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7124963B2 (en) * 2004-11-05 2006-10-24 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7137577B2 (en) * 2004-11-05 2006-11-21 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7185831B2 (en) * 2004-11-05 2007-03-06 Ford Motor Company Low pressure fuel injector nozzle
US7104475B2 (en) * 2004-11-05 2006-09-12 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7198207B2 (en) * 2004-11-05 2007-04-03 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7168637B2 (en) * 2004-11-05 2007-01-30 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
DE102004057151B4 (de) * 2004-11-26 2009-04-16 Continental Automotive Gmbh Einspritzventil mit einem Druckhalteventil zur Fluiddruckbeaufschlagung eines Federraums
JP4528701B2 (ja) * 2005-09-13 2010-08-18 日立オートモティブシステムズ株式会社 噴射弁及びオリフィスの加工方法
JP2008068360A (ja) * 2006-09-14 2008-03-27 Mitsubishi Heavy Ind Ltd ノズルボディの噴孔加工方法、噴孔加工装置、及びそれらを用いて作製された燃料噴射ノズル
US7572997B2 (en) * 2007-02-28 2009-08-11 Caterpillar Inc. EDM process for manufacturing reverse tapered holes
GB0712403D0 (en) 2007-06-26 2007-08-01 Delphi Tech Inc A Spray Hole Profile
JP5150416B2 (ja) * 2008-09-05 2013-02-20 日立オートモティブシステムズ株式会社 オリフィスの加工方法及びプレス加工方法
US20110030635A1 (en) * 2009-08-04 2011-02-10 International Engine Intellectual Property Company, Llc Fuel injector nozzle for reduced coking
KR101198805B1 (ko) * 2010-12-02 2012-11-07 현대자동차주식회사 차량용 인젝터
US20150020778A1 (en) * 2012-03-14 2015-01-22 International Engine Intellectual Property Company Llc Fuel injector nozzle
JP5959892B2 (ja) * 2012-03-26 2016-08-02 日立オートモティブシステムズ株式会社 火花点火式燃料噴射弁
EP2757247A1 (fr) * 2013-01-18 2014-07-23 EFI Hightech AG Buse d'injection pour un moteur à combustion interne
JP6264221B2 (ja) * 2014-07-24 2018-01-24 株式会社デンソー 燃料噴射ノズル
WO2020085039A1 (fr) * 2018-10-26 2020-04-30 日立オートモティブシステムズ株式会社 Soupape d'injection de carburant
JP6868144B1 (ja) * 2020-05-25 2021-05-12 株式会社スギノマシン ノズル
JP7026751B1 (ja) * 2020-11-13 2022-02-28 三菱電機株式会社 燃料噴射装置
CN115324715A (zh) * 2022-10-13 2022-11-11 潍柴动力股份有限公司 预燃室及加工方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2352957A1 (fr) * 1976-05-26 1977-12-23 Sulzer Ag Gicleur de soupape d'injection de carburant de moteur a combustion interne
US4578164A (en) * 1983-08-24 1986-03-25 Nissan Motor Co., Ltd. Method of electrolytically finishing spray-hole of fuel injection nozzle
EP0370659A1 (fr) * 1988-11-19 1990-05-30 Lucas Industries Public Limited Company Buse d'injection de combustible
EP0413173A2 (fr) * 1989-08-17 1991-02-20 STEYR-DAIMLER-PUCH Aktiengesellschaft Injecteur de combustible pour moteurs à combustion interne
US5026462A (en) * 1990-03-06 1991-06-25 Ail Corporation Method and apparatus for electrochemical machining of spray holes in fuel injection nozzles
EP0641931A1 (fr) * 1993-09-06 1995-03-08 Servojet Electronic Systems, Ltd. Système d'injection de combustible à accumulateur

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DE2557772A1 (de) * 1975-12-20 1977-06-23 Kloeckner Humboldt Deutz Ag Brennstoffeinspritzventil
DE2711350A1 (de) * 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen
JPS5882068A (ja) * 1981-11-09 1983-05-17 Nissan Motor Co Ltd 燃料噴射ノズル
US4715541A (en) * 1985-02-26 1987-12-29 Steyr-Daimler-Puch Ag Fuel injection nozzle for combustion engines
DE3533014A1 (de) * 1985-09-16 1987-03-26 Avl Verbrennungskraft Messtech Verfahren und einrichtung zur einbringung des kraftstoffes in den brennraum eines dieselmotors
ATE39546T1 (de) * 1985-10-22 1989-01-15 Voest Alpine Automotive Verfahren zum herstellen eines einspritzduesenkoerpers.
US5242118A (en) * 1989-08-17 1993-09-07 Steyr-Daimler-Punch Ag Fuel injector for internal combustion engines
JP2819702B2 (ja) * 1989-12-12 1998-11-05 株式会社デンソー 燃料噴射弁
US5449121A (en) * 1993-02-26 1995-09-12 Caterpillar Inc. Thin-walled valve-closed-orifice spray tip for fuel injection nozzle
DE19547423B4 (de) * 1995-12-19 2008-09-18 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2352957A1 (fr) * 1976-05-26 1977-12-23 Sulzer Ag Gicleur de soupape d'injection de carburant de moteur a combustion interne
US4578164A (en) * 1983-08-24 1986-03-25 Nissan Motor Co., Ltd. Method of electrolytically finishing spray-hole of fuel injection nozzle
EP0370659A1 (fr) * 1988-11-19 1990-05-30 Lucas Industries Public Limited Company Buse d'injection de combustible
EP0413173A2 (fr) * 1989-08-17 1991-02-20 STEYR-DAIMLER-PUCH Aktiengesellschaft Injecteur de combustible pour moteurs à combustion interne
US5026462A (en) * 1990-03-06 1991-06-25 Ail Corporation Method and apparatus for electrochemical machining of spray holes in fuel injection nozzles
EP0641931A1 (fr) * 1993-09-06 1995-03-08 Servojet Electronic Systems, Ltd. Système d'injection de combustible à accumulateur

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0890735A3 (fr) * 1997-07-11 2001-10-10 Robert Bosch Gmbh Soupape d'injection de combustible
WO2000023707A1 (fr) * 1998-10-15 2000-04-27 Robert Bosch Gmbh Gicleur de carburant pour moteurs a combustion interne a auto-allumage
EP1508689A1 (fr) * 1999-08-11 2005-02-23 Robert Bosch Gmbh Soupape d'injection de combustible
DE10050704A1 (de) * 2000-10-13 2003-02-20 Siemens Ag Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine
DE102009034072A1 (de) * 2009-07-22 2011-01-27 Emitec Gesellschaft Für Emissionstechnologie Mbh Einspritzdüse zur Zufuhr von Reduktionsmittel und Vorrichtung zur Behandlung von Abgasen
US8528884B2 (en) 2009-07-22 2013-09-10 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Injection nozzle for supplying reducing agent and device for treating exhaust gases
WO2012010657A3 (fr) * 2010-07-23 2012-06-14 Continental Automotive Gmbh Corps de buse comportant un trou borgne
EP2525077A1 (fr) * 2011-05-16 2012-11-21 Liebherr-Machines Bulle SA Buse

Also Published As

Publication number Publication date
JPH1054330A (ja) 1998-02-24
US5934571A (en) 1999-08-10

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