EP0551633A1 - Injecteur de carburant pour moteur à combustion interne - Google Patents

Injecteur de carburant pour moteur à combustion interne Download PDF

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Publication number
EP0551633A1
EP0551633A1 EP92121668A EP92121668A EP0551633A1 EP 0551633 A1 EP0551633 A1 EP 0551633A1 EP 92121668 A EP92121668 A EP 92121668A EP 92121668 A EP92121668 A EP 92121668A EP 0551633 A1 EP0551633 A1 EP 0551633A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection nozzle
fuel
edges
internal combustion
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Withdrawn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
EP92121668A
Other languages
German (de)
English (en)
Inventor
Karl Dipl.-Ing. Hofmann (Fh)
Edgar Dipl.-Ing. Goetz
Detlev Dr. Potz
Helmut Norberg
Klaus Dahlmeier
Bernhard Dipl.-Ing. Lucas
Uwe Dipl.-Ing. Gordon (Th)
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0551633A1 publication Critical patent/EP0551633A1/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Withdrawn legal-status Critical Current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
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • 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
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging 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
    • 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

Definitions

  • the invention is based on a fuel injection nozzle for internal combustion engines according to the preamble of claim 1.
  • the jet injected under high pressure into the combustion chamber is shaped by the spray holes, which are generally cylindrical with a smooth peripheral wall and have a length: diameter ratio of about 4.
  • the spray holes In order to focus the jet sharply, it is also known to shape the spray holes in the manner of a Laval nozzle (DE-OS 25 57 772) or at least to round the inlet of the spray holes as in the case of a Laval nozzle (DE-PS 12 12 352, EP -A 03 70 659).
  • the fuel injection nozzle according to the invention with the characterizing features of claim 1 has the advantage that, when cavitation is specifically generated, cavities are formed in the fuel flow flowing through the spray hole, which implode after leaving the spray hole, the fuel being atomized selectively and with high energy. This achieves an atomization quality of the fuel that would otherwise only be achievable through very high pump pressures.
  • Sharp edges are particularly advantageous in areas where the flow in the spray hole touches its wall.
  • FIG. 1 shows the injection-side end of a fuel injection nozzle greatly enlarged in longitudinal section
  • FIG. 2 shows an alternative to FIG. 1 in longitudinal section.
  • a nozzle body 1 has in the region of its injection-side end a conical sealing seat 2, with which a closing cone 4 of a spring-loaded valve needle 3, which is displaceably guided in the nozzle body 1, cooperates.
  • a blind hole 6 in a dome 5 of the nozzle body 1, from which spray holes 10 penetrating the wall of the dome 5 extend.
  • the inlet of the spray holes 10 can also be in the area of the sealing seat 2 and, depending on the design of the combustion chamber of the internal combustion engine, one or more spray holes can be arranged with different spray directions to the longitudinal axis of the injection nozzle.
  • the spray holes 10, which form the fuel flowing through into a jet, essentially have the shape of a cylinder with a constant diameter in the range from 0.10 to 0.40 mm.
  • the peripheral wall of the spray holes 10 is not uniformly smooth, but is composed of a plurality of annular, radially projecting, sharp edges 11 and grooves 12 which extend transversely to the longitudinal axis of the spray holes 10.
  • the height of the cross-sectional jumps in the wall of the spray holes is in the range of 10 m - 100 m.
  • these can be produced in the form of a fine thread, which has an incline of less than 50%, preferably 10%, of the length of a spray hole (FIG. 2).
  • the fuel injector works as follows: The fuel delivered by a fuel injection pump, not shown, is pressurized into the valve needle 3 receiving space of the nozzle body 1, the valve needle 3 lifts against a spring force against the sealing seat 2 at sufficient pressure, passes between the closing cone 4 and sealing seat 2 into the blind hole 6 and from there through the spray holes 10 into the combustion chamber. At the edges 11 and grooves 12 forming the peripheral wall of the spray holes 10, which extend transversely or substantially transversely to the flow direction and form tear-off edges, large areas are created in the flow in which the vapor pressure of the fuel falls below and thereby cavitation occurs. These cavities in the fuel jet implode after leaving the spray hole and atomize the fuel with selectively very high energy, so that a very high atomization quality of the fuel jet is achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP92121668A 1992-01-14 1992-12-19 Injecteur de carburant pour moteur à combustion interne Withdrawn EP0551633A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924200709 DE4200709A1 (de) 1992-01-14 1992-01-14 Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE4200709 1992-01-14

Publications (1)

Publication Number Publication Date
EP0551633A1 true EP0551633A1 (fr) 1993-07-21

Family

ID=6449469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92121668A Withdrawn EP0551633A1 (fr) 1992-01-14 1992-12-19 Injecteur de carburant pour moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP0551633A1 (fr)
JP (1) JPH05272433A (fr)
DE (1) DE4200709A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692625A1 (fr) * 1994-07-15 1996-01-17 New Sulzer Diesel AG Buse d'une soupape d'injection de combustible et procédé d'injection de combustible dans un moteur à combustion interne
WO2003093669A1 (fr) * 2002-05-02 2003-11-13 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
WO2005042968A1 (fr) * 2003-10-29 2005-05-12 Robert Bosch Gmbh Soupape d'injection de carburant
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
US7168637B2 (en) 2004-11-05 2007-01-30 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
US7198207B2 (en) 2004-11-05 2007-04-03 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10050055A1 (de) 2000-10-10 2002-04-18 Bosch Gmbh Robert Brennstoffeinspritzventil
DE102004063165A1 (de) 2004-12-29 2006-07-13 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
EP2333307A4 (fr) * 2008-09-24 2013-03-13 Toyota Motor Co Ltd Soupape d'injection de carburant pour moteur à combustion interne et son procédé de fabrication
DE102015007621A1 (de) * 2015-06-16 2016-12-22 Volkswagen Ag Kraftstoffeinspritzdüse zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine
CN105275698B (zh) * 2015-11-13 2017-11-10 吉林大学 一种发动机用变频喷油嘴
WO2019030078A1 (fr) * 2017-08-08 2019-02-14 Robert Bosch Gmbh Buse d'injecteur de carburant
DE102018004836A1 (de) * 2018-06-16 2019-12-19 L'orange Gmbh Kraftstoffinjektor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE631135C (de) * 1934-08-19 1936-06-12 Wanderer Werke Vorm Winklhofer Verfahren zur Herstellung von aus mehreren Teilen zusammengesetzten Dueseneinsaetzen
CH340093A (de) * 1956-05-12 1959-07-31 Sulzer Ag Brennstoffeinspritzdüse und Verfahren zu deren Herstellung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE631135C (de) * 1934-08-19 1936-06-12 Wanderer Werke Vorm Winklhofer Verfahren zur Herstellung von aus mehreren Teilen zusammengesetzten Dueseneinsaetzen
CH340093A (de) * 1956-05-12 1959-07-31 Sulzer Ag Brennstoffeinspritzdüse und Verfahren zu deren Herstellung

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692625A1 (fr) * 1994-07-15 1996-01-17 New Sulzer Diesel AG Buse d'une soupape d'injection de combustible et procédé d'injection de combustible dans un moteur à combustion interne
WO2003093669A1 (fr) * 2002-05-02 2003-11-13 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
WO2005042968A1 (fr) * 2003-10-29 2005-05-12 Robert Bosch Gmbh Soupape d'injection de carburant
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
US7168637B2 (en) 2004-11-05 2007-01-30 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
US7198207B2 (en) 2004-11-05 2007-04-03 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle

Also Published As

Publication number Publication date
DE4200709A1 (de) 1993-07-15
JPH05272433A (ja) 1993-10-19

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