EP0787253B1 - 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 Download PDF

Info

Publication number
EP0787253B1
EP0787253B1 EP95936333A EP95936333A EP0787253B1 EP 0787253 B1 EP0787253 B1 EP 0787253B1 EP 95936333 A EP95936333 A EP 95936333A EP 95936333 A EP95936333 A EP 95936333A EP 0787253 B1 EP0787253 B1 EP 0787253B1
Authority
EP
European Patent Office
Prior art keywords
fuel
valve
valve seat
fuel injector
tip portion
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.)
Expired - Lifetime
Application number
EP95936333A
Other languages
German (de)
English (en)
Other versions
EP0787253A1 (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

Images

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 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 configuration although inventive principles can be useful with other injected stream configurations.
  • a fuel injection valve is discussed in patent application WO-A-87/07334.
  • the valve has a valve needle which is drawn against a core when a magnetic coil is exited.
  • the valve needle is caused to rise together with a sealing seating formed on it, from a valve seating surface formed on the nozzle.
  • the sealing seating formed on the needle has a rounded profile and as a result the tendency of the needle to adhere to the valve seating on the nozzle is reduced.
  • a fuel injector having a body including an orifice in which is seated a ball valve which can be caused to rise to let fuel pass through the body, or fall to prevent the passage of fuel.
  • Fuel which passes through the body is passed out of the fuel injector valve via a disk having a raised portion.
  • the raised portion has metering orifices through which the fuel passes into an engine for combustion.
  • 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 throughout.
  • a fuel injector for injecting fuel into an internal combustion engine wherein the injector has a body, a fuel passageway through the body leading to a nozzle comprising a valve seat member disposed internally of the body within the passageway, the valve seat member having a hole from which fuel is ejected, a frustoconical valve seat, a valve having a compound valve needle surface at the tip end that is operated relative to the valve seat to close and open the passageway to flow by seating and unseating a tip end of the valve on and from the valve seat to disallow and allow flow to said hole, an orifice disk which is disposed against the valve seat member in covering relation to said hole, and through one or more metering orifices of which, fuel is injected, the tip end of said valve comprising a proximal tip portion having a spherical surface that seats on and unseats from said valve seat as said valve is operated, and a distal tip portion having a frustoconical surface extending
  • 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.
  • Fig. 1 shows a fuel injector 10 to comprise: a housing 12 of magnetically permeable material; a fuel inlet tube 14 also of magnetically permeable material; an adjusting tube 16; a helical coil spring 18; 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. 4,610,080.
  • 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 14 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 14 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 18 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.
  • the solenoid coil assembly When the solenoid coil assembly is energized, it pulls armature 20 toward tube 14 to unseat valve element 21 so that fuel is allowed to flow and be injected into an engine (not shown) from the fuel injector nozzle.
  • Valve seat member 30 is disposed in the nozzle end of housing 12 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 of 1.18 mm and the included cone angle is 110 degrees.
  • Seat 32 has an included angle of 90 degrees.
  • Figs. 4-6 represent "topographical plots" of spray dispersion patterns of three substantially identical fuel injectors embodying principles of the invention while Figs. 7-10 represent “topographical plots” of spray dispersion patterns of four fuel injectors substantially identical to those three, but embodying a prior needle tip that was fully spherically contoured. These tests were conducted under like conditions with the target fixture disposed in a plane 143 mm from the injector nozzle.
  • the invention retains a spherically contoured proximal segment of the needle tip end for seating purposes, but has a frustoconical surface - preferably substantially a full cone - extending from that spherically contoured segment. Since the tested fuel injectors were essentially the same except for the needle tip, it seems conclusive that the combination of these surfaces 52, 54 in the manner disclosed herein results in significant constriction of the dispersion of fuel injected from each metering orifice.

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)

Claims (4)

  1. Injecteur de carburant (10) pour injecter du carburant dans un moteur à combustion interne, dans lequel l'injecteur possède un corps (26), un passage de carburant traversant le corps (26) et menant à une buse qui comprend un organe formant siège de vanne (30) disposé à l'intérieur du corps (26), dans le passage, l'organe formant siège (30) ayant un trou d'où le carburant est éjecté, un siège de vanne tronconique (32), une vanne (21) présentant une surface d'aiguille de vanne composite à l'extrémité de pointe, qui est actionnée par rapport au siège de vanne (30) pour fermer et ouvrir le passage pour l'écoulement en appliquant une extrémité de pointe de la vanne (21) sur le siège de vanne (32) et en la soulevant de ce siège pour interdire et admettre l'écoulement vers ledit trou, un disque à orifices (40) qui est disposé contre l'organe formant siège de vanne (30), dans une position relative de recouvrement dudit trou, et à travers un ou plusieurs orifices de dosage (48a, 48b) duquel le carburant est injecté, l'extrémité de pointe de ladite vanne (21) comprenant une portion proximale de pointe (52) possédant une surface sphérique qui s'applique sur ledit siège de vanne (34) et s'en soulève lorsque ladite vanne (21) est actionnée, et une portion distale de pointe (54) possédant une surface tronconique qui part tangentiellement de ladite surface sphérique de ladite portion proximale de pointe (52), caractérisé en ce que ladite portion distale de pointe (54) se termine sensiblement par une pointe conique (56), de sorte que la totalité de la portion distale de pointe est sensiblement un cône complet pour diriger l'écoulement du carburant vers les orifices (48a, 48b).
  2. Injecteur de carburant selon la revendication 1, dans lequel les orifices de dosage (48a, 48b) comprennent deux orifices diamétralement opposés l'un à l'autre de part et d'autre d'un axe longitudinal de l'injecteur de carburant.
  3. Injecteur de carburant selon la revendication 2, dans lequel les orifices (48a, 48b) sont disposés dans un enfoncement (48).
  4. Injecteur de carburant selon la revendication 2 ou la revendication 3, dans lequel lesdits orifices de dosage (48a, 48b) et l'enfoncement (48) sont contenus dans un organe formant disque à orifices séparé (40) qui est disposé contre ledit siège de vanne (30).
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 EP0787253A1 (fr) 1997-08-06
EP0787253B1 true 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
ATE380936T1 (de) * 2005-08-24 2007-12-15 Delphi Tech Inc Einspritzdüse
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
US4934605A (en) * 1986-05-31 1990-06-19 Robert Bosch Gmbh Fuel injector valve
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

Also Published As

Publication number Publication date
DE69518432D1 (de) 2000-09-21
CN1168712A (zh) 1997-12-24
EP0787253A1 (fr) 1997-08-06
JPH10507507A (ja) 1998-07-21
WO1996012104A1 (fr) 1996-04-25
JP3625834B2 (ja) 2005-03-02
KR100386218B1 (ko) 2003-08-19
KR970707382A (ko) 1997-12-01
DE69518432T2 (de) 2001-03-15

Similar Documents

Publication Publication Date Title
EP1581739B1 (fr) Controle de configuration de jet avec des orifices non inclines formes sur disque alveole de dosage d'injection comportant un reducteur de volume de poche
KR100342093B1 (ko) 연료인젝터내의 와류발생기
US7299997B2 (en) Fuel injector with sauter-mean-diameter atomization spray of less than 70 microns
EP0636210B1 (fr) Siege de soupape d'injection a piege de remise en circulation
US4274598A (en) Electromagnetic fuel injection valve for internal combustion engines
US5996912A (en) Flat needle for pressurized swirl fuel injector
US6769625B2 (en) Spray pattern control with non-angled orifices in fuel injection metering disc
US6789754B2 (en) Spray pattern control with angular orientation in fuel injector and method
JPS61255264A (ja) 電磁式燃料噴射器のためのオリフイス・デイレクタ・プレ−ト
JPH0534515B2 (fr)
US20080006713A1 (en) Fuel injector having an internally mounted cross-flow nozzle for enhanced compressed natural gas jet spray
US7048202B2 (en) Compound-angled orifices in fuel injection metering disc
US20040011894A1 (en) Fuel injecton valve
US6845930B2 (en) Spray pattern and spray distribution control with non-angled orifices in fuel injection metering disc and methods
EP0787253B1 (fr) Injecteur de carburant avec dispersion reduite du jet de carburant, en particulier pour un jet de carburant injecte desaxe
US6820826B2 (en) Spray targeting to an arcuate sector with non-angled orifices in fuel injection metering disc and method
US6776353B2 (en) Fuel injector valve seat assembly with radially outward leading fuel flow passages feeding multi-hole orifice disk
US6866210B2 (en) Fuel injection valve
EP1328723B1 (fr) Soupape d'injection de carburant
US6273346B1 (en) Fluid fuel injector for an internal combustion engine
US6334576B1 (en) Fuel injector having a ball seat with multiple tip geometry
US6719220B2 (en) Fuel injection valve
JP3298310B2 (ja) 燃料噴射弁
JPH08232811A (ja) 流体噴射ノズル
JPH07259702A (ja) 電磁式燃料噴射弁

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19970315

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17Q First examination report despatched

Effective date: 19990210

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 69518432

Country of ref document: DE

Date of ref document: 20000921

ITF It: translation for a ep patent filed
ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20021010

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031016

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20031217

Year of fee payment: 9

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20031016

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20041029

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050503

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20051016

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060630

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20060630