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WO1997033086A1 - Conformation de l'orifice d'injecteur de carburant - Google Patents

Conformation de l'orifice d'injecteur de carburant Download PDF

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Publication number
WO1997033086A1
WO1997033086A1 PCT/SE1996/000281 SE9600281W WO9733086A1 WO 1997033086 A1 WO1997033086 A1 WO 1997033086A1 SE 9600281 W SE9600281 W SE 9600281W WO 9733086 A1 WO9733086 A1 WO 9733086A1
Authority
WO
WIPO (PCT)
Prior art keywords
orifice
fuel
fuel injector
circular
shape
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.)
Ceased
Application number
PCT/SE1996/000281
Other languages
English (en)
Inventor
Jerzy Chomiak
Lisa Jacobsson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PCT/SE1996/000281 priority Critical patent/WO1997033086A1/fr
Publication of WO1997033086A1 publication Critical patent/WO1997033086A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F02M61/184—Discharge orifices having non circular sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • 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

Definitions

  • the invention relates to a fuel injector and a method of producing its orifice as defined in the preamble of claim 1 and claim 5.
  • the object of the present invention is thus to achieve a fuel injector which is capable of achieving better fuel-air mixing characteristics preferably at lower cost.
  • the non-circular orifice of the present invention results in fuel-air mixing which may be some five times or more better than a circular orifice injector having the same orifice cross-sectional area. Additionally, the production of, for example, an elliptical orifice by using present day, per-se known, methods of electro-erosion (spark- erosion) is no more expensive than for producing a circular orifice.
  • the invention provides a simple yet overwhelmingly effective solution to a long-standing problem in the art of compression ignition engines. Similarly it is imaginable that the same technology could also be applied to direct injection engines working on the Otto cycle.
  • the non-circular orifice has been found by the inventors to be successful partly since the single injected jet of fuel becomes bifurcated into two or more jets of fuel. Such bifurcation moreover will normally take place within a distance from the orifice corresponding to a few cross- sectional widths of the injection orifice. In other words, the separation will occur very quickly.
  • the invention is however not limited to improved effects caused as a result of this phenomenon.
  • Fig. 1 shows a cross-sectional enlarged view of a portion of the wall of an injector body with an injection orifice.
  • Fig. 2 shows an end view of Fig. 1 taken in the direction of arrow "A" according to one embodiment of the present invention comprising an elliptical orifice.
  • Fig. 3 shows a further non-circular orifice shape similar to that in Fig. 2, with the exception being that the orifice is rectangular.
  • Fig. 4 shows a still further non-circular orifice similar to that in Fig. 2, with the exception being that the orifice is triangular.
  • Fig. 5 shows in Fig. 5a, a greatly enlarged frontal view of a nozzle orifice and, in Fig. 5b, a cross- sectional view through line V(b)-V(b) in Fig. 5a.
  • Fig. 6 shows a further non-circular orifice shape formed by using a circular and a rectangular electrode in a spark erosion process.
  • Fig. 1 depicts a small portion of the wall 1 of the nozzle body of an injector for a diesel engine.
  • the drawing is not to scale, but merely serves as a pictorial representation.
  • An orifice 2 is formed in the wall 1 by any suitable means, such as e.g. spark erosion.
  • the orifice 2 in Fig. 1 is of any non-circular shape as viewed in the direction of the principal axis Z-Z of the orifice.
  • the orifice may have any of the shapes shown in Figs. 2, 3, 4 or 5. Other shapes are also imaginable.
  • the actual dimensions of the elliptical orifice 2 shown in Fig. 2 are not strictly important for the invention and the "x" and "y" dimensions of the ellipse may be suitably chosen.
  • the "x" dimension may be twice the "y” dimension.
  • the orifice would typically have a minimum cross-sectional area of 0.008 mm 2 , although a more easily usable and reliable size in vehicle applications would have a cross-sectional area of about 0.032 mm 2 .
  • the invention is however not limited to such dimensions and will be chosen according to the design of the engine and pump system involved.
  • a rectangular orifice is shown in Fig. 3 and a triangular one in Fi . 4.
  • Fig. 5 an orifice has been chosen which has an outer wall 6 and a number of ramps 5 formed thereon or therein in any suitable manner.
  • the outer wall 6 as depicted is only a schematic representation and, in the normal case, the wall 6 will merely be an integral part of the wall 1 depicted in Fig. 1.
  • the ramps in this embodiment, are formed by cutting back the metal at the orifice and into the body of the injector to form a series of five recesses.
  • the non- circular orifice shape may be formed by leaving portions of the orifice periphery within the border of an otherwise circular shape orifice. In this way protuberances are formed.
  • the injectors having an orifice formed in accordance with this invention have a much improved air-fuel mixing when compared with a circular nozzle orifice as used in the prior art having the same cross-sectional area.
  • the conventional method of forming small orifices in injectors is by spark erosion.
  • the same technique, per se, can also be used with the present invention, although a different shape of electrode, traditionally formed of copper wire, must be formed to carry out the process.
  • the shape of the electrode (in cross-section) must be the same as the orifice to be formed.
  • the dimensions of said electrode may however be marginally smaller than the orifice to be formed.
  • an e.g. circular electrode might first be applied to form a circular orifice, followed in a separate step by a square or rectangular electrode of slightly larger dimension such that the peripheries of each of said shapes overlaps.
  • the spark erosion of the second electrode will form essentially triangular recesses 7 at four corners of the orifice interspersed with segments 8, as shown in Fig. 6.
  • Other more complicated shapes may also be obtained by using two or more differently shaped electrodes.
  • the order of use of the electrodes is of no importance.

Landscapes

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

Abstract

Pour améliorer le mélange air/carburant d'un jet de carburant injecté dans un moteur, l'orifice de cet injecteur de carburant présente une conformation non-circulaire. L'orifice est formé par étincelage à l'aide d'une électrode d'étincelage dont la forme en coupe transversale n'est pas circulaire.
PCT/SE1996/000281 1996-03-04 1996-03-04 Conformation de l'orifice d'injecteur de carburant Ceased WO1997033086A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE1996/000281 WO1997033086A1 (fr) 1996-03-04 1996-03-04 Conformation de l'orifice d'injecteur de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1996/000281 WO1997033086A1 (fr) 1996-03-04 1996-03-04 Conformation de l'orifice d'injecteur de carburant

Publications (1)

Publication Number Publication Date
WO1997033086A1 true WO1997033086A1 (fr) 1997-09-12

Family

ID=20401155

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000281 Ceased WO1997033086A1 (fr) 1996-03-04 1996-03-04 Conformation de l'orifice d'injecteur de carburant

Country Status (1)

Country Link
WO (1) WO1997033086A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008051365A1 (de) 2008-10-15 2010-04-29 L'orange Gmbh Kraftstoff-Einspritzventil für Brennkraftmaschinen
WO2018036966A1 (fr) * 2016-08-24 2018-03-01 Delphi Technologies Ip Limited Corps de buse d'injecteur de carburant
US10612508B2 (en) 2017-06-28 2020-04-07 Caterpillar Inc. Fuel injector for internal combustion engines
EP3643441A1 (fr) * 2018-10-22 2020-04-29 Rolls-Royce plc Outil d'usinage par décharge électrique et son procédé d'utilisation
US12037967B2 (en) 2020-08-19 2024-07-16 Cummins Inc. Fuel injector having nozzle spray holes with grooves

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1004631A (en) * 1961-10-12 1965-09-15 Anocut Eng Co Improvements in or relating to electrolytic cavity sinking apparatus and method
DE2845639A1 (de) * 1978-03-16 1979-09-20 Zschopau Motorrad Veb Einspritzduese fuer brennkraftmaschinen
CH623892A5 (fr) * 1976-12-24 1981-06-30 Maschf Augsburg Nuernberg Ag
DE3321286A1 (de) * 1982-06-18 1983-12-29 Société d'Etudes de Machines Thermiques S.E.M.T., 93202 Saint-Denis Kraftstoffeinspritzduese und mit dieser ausgestattete brennkraftmaschine
EP0234642A1 (fr) * 1986-02-18 1987-09-02 WEBER S.r.l. Injecteur électromagnétique pour moteur à combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1004631A (en) * 1961-10-12 1965-09-15 Anocut Eng Co Improvements in or relating to electrolytic cavity sinking apparatus and method
CH623892A5 (fr) * 1976-12-24 1981-06-30 Maschf Augsburg Nuernberg Ag
DE2845639A1 (de) * 1978-03-16 1979-09-20 Zschopau Motorrad Veb Einspritzduese fuer brennkraftmaschinen
DE3321286A1 (de) * 1982-06-18 1983-12-29 Société d'Etudes de Machines Thermiques S.E.M.T., 93202 Saint-Denis Kraftstoffeinspritzduese und mit dieser ausgestattete brennkraftmaschine
EP0234642A1 (fr) * 1986-02-18 1987-09-02 WEBER S.r.l. Injecteur électromagnétique pour moteur à combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT, No. 94-215458/26, Week 9426; & SU,A,1 808 553, (TSNITA RES PRODN ASSOC), 15 April 1993. *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008051365A1 (de) 2008-10-15 2010-04-29 L'orange Gmbh Kraftstoff-Einspritzventil für Brennkraftmaschinen
DE102008051365B4 (de) * 2008-10-15 2010-07-01 L'orange Gmbh Kraftstoff-Einspritzventil für Brennkraftmaschinen
WO2018036966A1 (fr) * 2016-08-24 2018-03-01 Delphi Technologies Ip Limited Corps de buse d'injecteur de carburant
FR3055371A1 (fr) * 2016-08-24 2018-03-02 Delphi International Operations Luxembourg S.A R.L. Corps de buse d'injecteur de carburant
US10612508B2 (en) 2017-06-28 2020-04-07 Caterpillar Inc. Fuel injector for internal combustion engines
EP3643441A1 (fr) * 2018-10-22 2020-04-29 Rolls-Royce plc Outil d'usinage par décharge électrique et son procédé d'utilisation
US11511361B2 (en) * 2018-10-22 2022-11-29 Rolls-Royce Plc Electro-discharge machining tool and a method of using the same
US12037967B2 (en) 2020-08-19 2024-07-16 Cummins Inc. Fuel injector having nozzle spray holes with grooves

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