EP0787253A1 - Injecteur de carburant avec dispersion reduite du jet de carburant, en particulier pour un jet de carburant injecte desaxe - Google Patents

Injecteur de carburant avec dispersion reduite du jet de carburant, en particulier pour un jet de carburant injecte desaxe

Info

Publication number
EP0787253A1
EP0787253A1 EP95936333A EP95936333A EP0787253A1 EP 0787253 A1 EP0787253 A1 EP 0787253A1 EP 95936333 A EP95936333 A EP 95936333A EP 95936333 A EP95936333 A EP 95936333A EP 0787253 A1 EP0787253 A1 EP 0787253A1
Authority
EP
European Patent Office
Prior art keywords
fuel injector
tip portion
fuel
set forth
orifices
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
EP95936333A
Other languages
German (de)
English (en)
Other versions
EP0787253B1 (fr
Inventor
Ross W. Woods
Henry C. Dozier
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.)
Siemens Automotive Corp
Original Assignee
Siemens Automotive Corp
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 Siemens Automotive Corp filed Critical Siemens Automotive Corp
Publication of EP0787253A1 publication Critical patent/EP0787253A1/fr
Application granted granted Critical
Publication of EP0787253B1 publication Critical patent/EP0787253B1/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
    • F02M61/1806—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
    • 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
    • F02M51/0671—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 having an elongated valve body attached thereto
    • 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
    • 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
    • F02M61/1853—Orifice plates

Definitions

  • This invention relates to fuel injectors of the type that inject fuel into an internal combustion engine, and in particular to a novel cooperation between the needle valve and the valve seat that reduces the dispersion of fuel injected from the fuel injector through a thin disk orifice at the injector nozzle, especially in an off-axis direction.
  • the invention offers rather dramatically reduced dispersion for various multiple split stream configurations although inventive principles can be useful with other injected stream configurations.
  • control involves the extent to which an injected fuel stream disperses, or spreads out, as it leaves a metering orifice in the nozzle, and for certain engine configurations, it is important to limit the extent to which an injected fuel stream disperses.
  • the present invention relates to reducing the dispersion of injected fuel, especially in off-axis directions from multiple metering orifices although certain principles of the invention have application to other orifice configurations.
  • the invention arises not from any modification to a metering orifice or to a thin disk that contains one or more such metering orifices, but rather to a modification to the shape of the tip end of the needle valve and its cooperation with the associated valve seat. While the geometry of a needle tip end and its associated valve seat is apt to bear some relation to controlling the nature of the injected fuel stream leaving a metering orifice, it has been discovered that a particular shaping of the needle tip end in relation to the valve seat produces significantly less dispersion of injected fuel streams in comparison to a prior needle tip end that is spherically contoured thorughout.
  • the present invention may be said to relate to a fuel injector for injecting fuel into an internal combustion engine
  • the fuel injector comprises a body, a fuel passageway through the body leading to a nozzle from which fuel is injected, a valve seat member disposed internally of the body within the passageway and comprising a frustoconical valve seat leading to and circumscribing a hole, an electrically operated mechanism comprising a needle valve element that is reciprocated relative to the valve seat to close and open the passageway to flow by seating and unseating the tip end of the needle valve element on and from the valve seat to disallow and allow flow through the circumscribed hole in the valve seat member, and an orifice disk which is disposed against the seat member in covering relation to said hole, and through one of more metering orifices of which, fuel is injected, characterized in that the tip end of the needle valve element comprises a proximal tip portion and a distal tip portion, said proximal tip portion comprises a surface in the form of
  • the present invention may be said to relate to a fuel injector for injecting fuel into an internal combustion engine
  • the fuel injector comprises a body, a fuel passageway through the body leading to a nozzle comprising one or more metering orifices from which fuel is injected, a valve seat member disposed internally of the body within the passageway and comprising a frustoconical valve seat, an electrically operated mechanism comprising a needle valve element that is reciprocated relative to the valve seat to close and open the passageway to flow by seating and unseating the tip end of the needle valve element on and from the valve seat to disallow and allow flow to said one or more metering orifices, characterized in that the tip end of the needle valve element comprises a proximal tip portion and a distal tip portion, said proximal tip portion comprises a surface in the form of a segment of an imaginary sphere that is geometrically defined by imaginary spaced- apart, parallel planes passing through such imaginary sphere, said surface of said proximal tip portion being
  • More specific aspects relate to the rather dramatically reduced dispersion obtained with various multiple split stream configurations.
  • Fig. 1 is a longitudinal view, partly in cross section, of a fuel injector embodying principles of the invention.
  • Fig. 2 is a fragmentary longitudinal cross section view proximate the nozzle of the fuel injector.
  • Fig. 3 is a longitudinal view of the needle tip end.
  • Figs. 4-10 are graphical plots diagrams useful in illustrating representative improvements obtained with the invention. etailed Description of the Preferred Embodiment
  • Fig. 1 shows a fuel injector 1 0 to comprise: a housing 1 2 o magnetically permeable material; a fuel inlet tube 1 4 also o magnetically permeable material; an adjusting tube 1 6; a helical coil spring 1 8; an armature 20 having a needle valve element 21 joined thereto; a solenoid coil assembly 22, including electrical terminals 23 extending therefrom via which the fuel injector is connected with an electrical operating circuit (not shown) for selectively energizing the solenoid coil; a non-metallic end cap 24; and a valve body assembly 26.
  • the relative organization and arrangement of these various parts are essentially the same as in the fuel injector of commonly assigned U.S. patent No. 4,61 0,080.
  • the injector is the type which is commonly referred to as a top-feed type wherein fuel is introduced through inlet tube 14 and emitted as injections from the axially opposite nozzle, or tip, end.
  • Principles of the invention are equally applicable to "side-" and "bottom-" feed injectors.
  • Inlet tube 1 4 is disposed within solenoid coil assembly 22, and in addition to conveying pressurized liquid fuel into the interior of the fuel injector, it functions as a stator of the magnetic circuit that operates armature 20.
  • the lower end of tube 1 4 and the upper end of armature 20 cooperatively define a working gap 28. Because the axial dimension of the working gap is small, it appears in Fig. 1 simply as a line thickness.
  • spring 1 8 pushes armature 20 away from tube 14 to cause the tip end of valve element 21 to be seated on a valve seat member 30 (to be described shortly) so that fuel is prevented from flowing through the fuel injector's internal passageway from the inlet to the nozzle.
  • Valve seat member 30 is disposed in the nozzle end of housing 1 2 and comprises a frustoconical seat 32. Figs. 2 and 3 show more detail.
  • a needle guide member 36 is affixed to the upstream rim of seat member 30 for guiding the motion of the needle proximate the tip end; and it also contains several holes 36a allowing fuel to pass through.
  • Seat 32 funnels to a circular hole 38 that is covered by a thin orifice disk 40.
  • a back-up washer 42 holds disk 40 against member 30 and the parts 42, 40, and 30 are axially secured within the nozzle end of the fuel injector by being axially captured between an internal shoulder 44, and a crimp 46.
  • Disk 40 contains a central dimple 48 that has two orifices 48a, 48b diametrically opposite each other for injecting fuel in a dual split stream pattern. As each stream leaves an orifice, it has a tendency to disperse, or spread out. In certain applications where targeting of a stream is especially important, it is desirable to minimize the dispersion of the stream.
  • this is accomplished by modifying the shape of the needle tip end so that instead of being completely spherically contoured, it comprises a proximal tip portion and a distal tip portion, wherein the proximal tip portion comprises a surface 52 in the form of a segment of an imaginary sphere that is geometrically defined by imaginary spaced- apart, parallel planes passing through such imaginary sphere, said surface of said proximal tip portion being that portion of said tip end that seats on and unseats from seat 32 as valve element 21 is reciprocated, and the distal tip portion comprises a frustoconical surface 54 extending tangentially from surface 52 of the proximal tip portion.
  • the frustoconical surface 54 preferably terminates in substantially a cone tip 56 so that the entirety of the distal tip portion may be deemed substantially a full cone extending tangentially from surface 52.
  • a substantially full cone includes a cone whose tip comes to a point that is slightly blunted, or flattened, so as to be substantially, but not perfectly, a sharp point.
  • surface 52 has a spherical radius o 1 .18 mm and the included cone angle is 1 10 degrees.
  • Seat 32 has a included angle of 90 degrees.
  • Figs. 4-6 represent "topographical plots” o spray dispersion patterns of three substantially identical fuel injector embodying principles of the invention while Figs. 7-1 0 represen “topographical plots” of spray dispersion patterns of four fuel injector substantially identical to those three, but embodying a prior needle ti that was fully spherically contoured. These tests were conducte under like conditions with the target fixture disposed in a plane 1 4 mm from the injector nozzle.
  • the invention retains a sphericall contoured proximal segment of the needle tip end for seatin purposes, but has a frustoconical surface - preferably substantially full cone - extending from that spherically contoured segment.

Landscapes

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

Abstract

On parvient à améliorer considérablement la limitation de la dispersion d'un jet de carburant injecté, en construisant la pointe de la soupape à pointeau (21) avec une partie proximale et une partie distale. Cette partie proximale est constituée par une surface (52) se présentant sous la forme d'un segment d'une sphère imaginaire qui est défini géométriquement par des plans parallèles espacés imaginaires, lesquels coupent cette sphère imaginaire. La surface de la partie proximale de ladite pointe est constituée par la partie de cette pointe qui vient se loger sur un siège tronconique (32) et se déloger de ce siège, selon le mouvement alternatif de la soupape, et la partie distale (56) de la pointe de la soupape est constituée par une surface tronconique (54) s'étendant tangentiellement à partir de la partie proximale de cette pointe. En limitant ainsi la dispersion du jet de carburant injecté, on obtient un meilleur ciblage du carburant injecté.
EP95936333A 1994-10-17 1995-10-16 Injecteur de carburant avec dispersion reduite du jet de carburant, en particulier pour un jet de carburant injecte desaxe Expired - Lifetime EP0787253B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US32397294A 1994-10-17 1994-10-17
US323972 1994-10-17
PCT/US1995/013209 WO1996012104A1 (fr) 1994-10-17 1995-10-16 Injecteur de carburant avec dispersion reduite du jet de carburant, en particulier pour un jet de carburant injecte desaxe

Publications (2)

Publication Number Publication Date
EP0787253A1 true EP0787253A1 (fr) 1997-08-06
EP0787253B1 EP0787253B1 (fr) 2000-08-16

Family

ID=23261513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95936333A Expired - Lifetime EP0787253B1 (fr) 1994-10-17 1995-10-16 Injecteur de carburant avec dispersion reduite du jet de carburant, en particulier pour un jet de carburant injecte desaxe

Country Status (6)

Country Link
EP (1) EP0787253B1 (fr)
JP (1) JP3625834B2 (fr)
KR (1) KR100386218B1 (fr)
CN (1) CN1168712A (fr)
DE (1) DE69518432T2 (fr)
WO (1) WO1996012104A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545333A1 (de) * 1995-12-05 1997-06-12 Bosch Gmbh Robert Ventilschließkörper und Verfahren und Vorrichtung zur Herstellung von Dichtsitzen an Ventilschließkörpern
JP2001231203A (ja) * 2000-02-10 2001-08-24 Mitsubishi Electric Corp 車両用交流発電機
JP4025768B2 (ja) * 2004-09-27 2007-12-26 株式会社ケーヒン 燃料噴射弁
EP1757803B1 (fr) * 2005-08-24 2007-12-12 Delphi Technologies, Inc. Buse d'injection
CN103277225A (zh) * 2013-06-07 2013-09-04 苏州柏德纳科技有限公司 一种喷油嘴

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2097638A5 (fr) * 1970-07-16 1972-03-03 Kugelfischer G Schaefer & Co
JP2553120B2 (ja) * 1986-05-31 1996-11-13 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 燃料噴射弁
JPH0196463A (ja) * 1987-10-05 1989-04-14 Aisan Ind Co Ltd 電磁燃料噴射器の球形弁子とその製造方法
DE4123692C2 (de) * 1991-07-17 1995-01-26 Bosch Gmbh Robert Brennstoffeinspritzventil
JPH06207568A (ja) * 1993-01-11 1994-07-26 Hitachi Ltd 燃料噴射弁及び燃料噴射弁の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9612104A1 *

Also Published As

Publication number Publication date
EP0787253B1 (fr) 2000-08-16
DE69518432D1 (de) 2000-09-21
JP3625834B2 (ja) 2005-03-02
KR970707382A (ko) 1997-12-01
WO1996012104A1 (fr) 1996-04-25
DE69518432T2 (de) 2001-03-15
JPH10507507A (ja) 1998-07-21
KR100386218B1 (ko) 2003-08-19
CN1168712A (zh) 1997-12-24

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