EP0467680A1 - Kraftstoffeinspritzdüse für Brennkraftmaschinen - Google Patents

Kraftstoffeinspritzdüse für Brennkraftmaschinen Download PDF

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Publication number
EP0467680A1
EP0467680A1 EP91306538A EP91306538A EP0467680A1 EP 0467680 A1 EP0467680 A1 EP 0467680A1 EP 91306538 A EP91306538 A EP 91306538A EP 91306538 A EP91306538 A EP 91306538A EP 0467680 A1 EP0467680 A1 EP 0467680A1
Authority
EP
European Patent Office
Prior art keywords
nozzle body
bore portion
fuel
valve member
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Withdrawn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
EP91306538A
Other languages
English (en)
French (fr)
Inventor
David John Firethorns Gaskell
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0467680A1 publication Critical patent/EP0467680A1/de
Withdrawn legal-status Critical Current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
    • F02M61/168—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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

Definitions

  • This invention relates to fuel injection nozzles for internal combustion engines.
  • UK patent application GB2173856A describes a nozzle comprising a nozzle body formed with a central bore extending from an end face and having two spaced bore portions in which an injection valve member is a close sliding fit, the spaced bore portions being separated by a fuel gallery comprising an annular undercut bore portion with a radially extended collecting chamber.
  • a first one of the two close fitting bore portions ends substantially adjacent the end face of the nozzle body. Extending from the further end of the second close-fitting bore portion, opposite the fuel gallery, is a further nozzle body bore portion surrounding a reduced diameter portion of the valve member.
  • the end of the valve member seats, in the closed condition of the nozzle, on a valve seat formed in the nozzle body to prevent access of fuel from the further bore portion to one or more spray holes formed in a tip portion of the nozzle body.
  • the nozzle body has a fuel passage in a wall of the body surrounding the first close fitting bore portion and extending from an inlet in the end face to the collecting chamber for supplying fuel thereto.
  • One or more longitudinal flats are formed along the portion of the valve member surrounded by the second close fitting bore portion, along which flats fuel may flow from the fuel gallery to the further bore portion and thence, in the open condition of the nozzle, to the spray hole or holes.
  • the invention provides a fuel injection nozzle for internal combustion engines in which a valve member is slidably supported within a bore formed within a nozzle body, the bore extending from an end face of the body and comprising a bore portion in which a cylindrical portion of the valve member is a close sliding fit, and a further bore portion which extends from the close fitting bore portion and surrounds a reduced-diameter portion of the valve member, the end of which seats in the closed condition of the nozzle on a valve seat formed in the nozzle body to prevent access of fuel to one or more spray holes formed in a tip portion of the nozzle body, the nozzle body housing a fuel passage extending within the nozzle body wall from an inlet in the end face, characterised in that the fuel passage is positioned for supplying fuel to a longitudinal groove formed in the wall of the close fitting bore portion, the longitudinal groove being spaced from the end of the close fitting bore portion nearer the end face of the nozzle body, and extending along the remainder of the close fitting bore portion for supplying fuel to the further bore portion
  • the close-fitting bore portion is formed with more than one longitudinal groove, the grooves being spaced around the circumference of the bore, an annular fuel gallery being formed around the circumference of the close-fitting bore portion to connect the fuel passage to the longitudinal grooves.
  • the longitudinal grooves, and the fuel gallery if required, may be machined by proven electrochemical machining (ECM) or electrical discharge machining (EDM) techniques.
  • ECM electrochemical machining
  • EDM electrical discharge machining
  • the fuel injection nozzle shown in Figure 1, 2 and 3 is for use in a compression ignition engine.
  • the nozzle body 2 is of the form of a body of revolution having a relatively large outside diameter upper end section 4, an intermediate outside diameter centre section 6 and a nozzle forming portion 8 of further reduced diameter, ending in a nozzle tip 10.
  • An axial bore 12 extends from the upper end face 14 to the tip 10.
  • a valve member 16 shown in Figure 2, which comprises a cylindrical portion 18 which is a close sliding fit within a portion 20 of the bore 12 within the upper end section 4 and centre section 6 of the nozzle body 2.
  • the close fitting bore portion 20 leads from the upper end face 14 into an undercut bore portion 24 formed by an enlargement of the bore 12.
  • a further bore portion 26 extends from the undercut bore portion 24 to the tip 10, which terminates in a frusto-conical valve seat 28.
  • Fuel spray holes 30 are formed in the tip 10 beyond the valve seat 28.
  • a reduced diameter portion 32 of the valve member 16 extends from the close fitting valve portion 18 through the undercut bore portion 24 and the further bore portion 26.
  • the valve member 16 terminates in a valve tip 34 comprising two frusto-conical surfaces intersecting at a junction for seating on the valve seat 28.
  • the valve member 16 is resiliently urged for example by a spring and thrust washer located on a pin 36 into the closed condition of the nozzle in which the valve member 16 seats on the valve seat 28, thereby closing off access to the spray holes 30 from the clearance space between the reduced diameter portion 32 of the valve member 16 and the further bore portion 26.
  • Fuel is delivered to the fuel injector nozzle at the entrance 38 to the fuel supply passage 40, which extends within the wall of the nozzle body 2 from the upper surface 14.
  • the passage 40 connects to the upper end 42 of a longitudinal groove 44 formed along a part of the wall of the close fitting bore portion 20.
  • the longitudinal groove 44 extends from a point 42 approximately midway between the upper face 14 of the nozzle body 2 and the undercut bore portion 24, to open into the undercut bore portion 24.
  • Fuel supplied to the fuel supply passage 40 can thus flow through the longitudinal groove 44 to the undercut bore portion 24 and into the clearance space between the bore 12 and the reduced diameter portion 32 of the valve member 16.
  • the fuel pressure lifts the valve member 16 from the valve seat 28 against the spring located on the pin 36, and fuel flows under pressure through the spray holes 30.
  • the fuel supply passage 40 is a straight passage and can therefore be drilled mechanically.
  • the longitudinal groove 44 may be formed by mechanical machining, or advantageously by proven electrochemical machining (ECM) or electrical discharge machining (EDM) techniques.
  • ECM electrochemical machining
  • EDM electrical discharge machining
  • the groove 44 should preferably be formed after the passage 40 has been drilled especially if ECM is to be used, as the ECM process tends to remove burrs and sharp edges formed by mechanical machining. Such burrs and sharp edges may otherwise break free from the nozzle body during operation of the injector under the influence of fuel pressure pulses, and can cause damage to the nozzle or engine or detrimentally affect its operation.
  • the outer dimensions of the nozzle body 2 are determined by the application in which it is to be used, standardised nozzle body dimensions being required for most applications.
  • the invention provides a nozzle in which, for given outer body dimensions, the nozzle strength is high since the thickness of the web 46 adjacent the undercut bore portion 24 is greater than in conventional nozzles.
  • a fillet 48 may be added in nozzles for certain applications further to increase the thickness of the web 46.
  • the length of the close-fitting bore portion 20 may be increased compared with conventional nozzles, providing better location and guiding of the valve member 16.
  • a second embodiment of the invention is shown in Figures 4 and 5, in which three parallel longitudinal grooves are formed along the lower part of the close-fitting bore portion 120.
  • the fuel supply passage 140 is a straight passage, as in the nozzle body of Figures 1 and 3, but connects at its lower end to a fuel gallery 150 which comprises an annular recess around the wall of the close-fitting bore portion 120.
  • the fuel gallery 150 may be formed by mechanical machining or advantageously by ECM or EDM.
  • the fuel gallery 150 connects to the upper end 142 of each of the three longitudinal grooves 144. Fuel thus flows from the supply passage 140, to the fuel gallery 150 and along the grooves 144 to the undercut bore portion 124.
  • the same valve member 16 shown in Figure 2 may be used with both embodiments of the nozzle body of the invention.
  • each of the longitudinal grooves may be of smaller cross-sectional area than the single groove of the first embodiment while still providing the same area for the flow of fuel from the supply passage to the undercut bore portion.
  • the strength of the nozzle body in the second embodiment may therefore be greater than that of the first as the thickness of the webs 146 may be larger than that of the web 46 for given external nozzle body dimensions.
  • any side loading of the valve member 16 caused by fuel pressure in the single longitudinal groove 44 of the first embodiment is alleviated by the symmetrical arrangement of grooves 144 in the second embodiment.
  • grooves may also be used. For example more than three grooves may be used if increased web thickness is required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP91306538A 1990-07-20 1991-07-18 Kraftstoffeinspritzdüse für Brennkraftmaschinen Withdrawn EP0467680A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9015979 1990-07-20
GB909015979A GB9015979D0 (en) 1990-07-20 1990-07-20 Fuel injection nozzles for internal combustion engines

Publications (1)

Publication Number Publication Date
EP0467680A1 true EP0467680A1 (de) 1992-01-22

Family

ID=10679395

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91306538A Withdrawn EP0467680A1 (de) 1990-07-20 1991-07-18 Kraftstoffeinspritzdüse für Brennkraftmaschinen

Country Status (4)

Country Link
EP (1) EP0467680A1 (de)
JP (1) JPH04232377A (de)
BR (1) BR9103157A (de)
GB (1) GB9015979D0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10023957B4 (de) * 2000-05-16 2008-07-31 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
EP3632682A1 (de) * 2018-10-03 2020-04-08 Bond high performance 3D technology B.V. Verflüssigerrohr für ein system zur generativen fertigung
EP3632681A1 (de) * 2018-10-03 2020-04-08 Bond high performance 3D technology B.V. Verflüssigerrohr für ein system zur generativen fertigung
WO2020070212A1 (en) * 2018-10-03 2020-04-09 Bond High Performance 3D Technology B.V. Liquefier tube for an additive manufacturing system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK177669B1 (da) * 2012-09-25 2014-02-10 Hans Jensen Lubricators As Injektionsdyse til brug ved olieinjicering af olie for smøring af cylindre i større motorer samt anvendelse heraf

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2358220A1 (de) * 1973-11-22 1975-05-28 Kloeckner Humboldt Deutz Ag Verfahren zur herstellung eines kraftstoffeinlagerungsraumes fuer kraftstoffeinspritzventile
GB1447040A (en) * 1972-12-22 1976-08-25 Cav Ltd Liquid fuel injection nozzles for internal combsution engines
US4494700A (en) * 1982-12-14 1985-01-22 Steyr-Daimler-Puch Aktiengesellschaft Fuel injection nozzle for air-compressing, self-igniting reciprocating internal combustion engines
GB2173856A (en) * 1985-02-26 1986-10-22 Steyr Daimler Puch Ag I.c. engine fuel-injection nozzle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1447040A (en) * 1972-12-22 1976-08-25 Cav Ltd Liquid fuel injection nozzles for internal combsution engines
DE2358220A1 (de) * 1973-11-22 1975-05-28 Kloeckner Humboldt Deutz Ag Verfahren zur herstellung eines kraftstoffeinlagerungsraumes fuer kraftstoffeinspritzventile
US4494700A (en) * 1982-12-14 1985-01-22 Steyr-Daimler-Puch Aktiengesellschaft Fuel injection nozzle for air-compressing, self-igniting reciprocating internal combustion engines
GB2173856A (en) * 1985-02-26 1986-10-22 Steyr Daimler Puch Ag I.c. engine fuel-injection nozzle

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10023957B4 (de) * 2000-05-16 2008-07-31 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
EP3632682A1 (de) * 2018-10-03 2020-04-08 Bond high performance 3D technology B.V. Verflüssigerrohr für ein system zur generativen fertigung
EP3632681A1 (de) * 2018-10-03 2020-04-08 Bond high performance 3D technology B.V. Verflüssigerrohr für ein system zur generativen fertigung
WO2020070212A1 (en) * 2018-10-03 2020-04-09 Bond High Performance 3D Technology B.V. Liquefier tube for an additive manufacturing system
WO2020070219A1 (en) * 2018-10-03 2020-04-09 Bond High Performance Technology B.V. Liquefier tube for an additive manufacturing system
US11850797B2 (en) 2018-10-03 2023-12-26 Bond High Performance 3D Technology B.V. Liquefier tube for an additive manufacturing system
US11964427B2 (en) 2018-10-03 2024-04-23 Bond High Performance 3D Technology B.V. Liquefier tube for an additive manufacturing system

Also Published As

Publication number Publication date
BR9103157A (pt) 1992-02-11
GB9015979D0 (en) 1990-09-05
JPH04232377A (ja) 1992-08-20

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