EP0619426B1 - Buse d'injection de combustible pour moteurs à combustion interne - Google Patents

Buse d'injection de combustible pour moteurs à combustion interne Download PDF

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Publication number
EP0619426B1
EP0619426B1 EP94102949A EP94102949A EP0619426B1 EP 0619426 B1 EP0619426 B1 EP 0619426B1 EP 94102949 A EP94102949 A EP 94102949A EP 94102949 A EP94102949 A EP 94102949A EP 0619426 B1 EP0619426 B1 EP 0619426B1
Authority
EP
European Patent Office
Prior art keywords
spray hole
fuel
nozzle body
injection nozzle
spray
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
EP94102949A
Other languages
German (de)
English (en)
Other versions
EP0619426A1 (fr
Inventor
Uwe Dipl.-Ing. Gordon (Th)
Guenter Dipl.-Ing. Lewentz (Fh)
Detlev Dr. Potz
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 EP0619426A1 publication Critical patent/EP0619426A1/fr
Application granted granted Critical
Publication of EP0619426B1 publication Critical patent/EP0619426B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M61/04—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
    • F02M61/042—The valves being provided with fuel passages
    • F02M61/045—The valves being provided with fuel discharge 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
    • F02M61/04—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
    • F02M61/08—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 the valves opening in direction of fuel flow

Definitions

  • the invention relates to a fuel injector for internal combustion engines according to the genus of claim 1.
  • the injector known from DE-A-33 00 953 run the relatively short, designed as blind holes Spray holes in a flat cone angle in the closing head and open in the circumference of a cylindrical portion of that encompassed by the nozzle body Closing head.
  • the inlet channels open into the spray holes a right angle from an upstream of the cylindrical section tapered section and out in a steep Extend the angle in the locking head.
  • the document WO-A-93/04277 already shows one Fuel injector for internal combustion engines with an in a nozzle body axially guided, opening to the outside Valve needle on its one valve sealing surface having end has a closing head in which at least one spray hole which can be controlled as a function of the needle stroke and one that connects this to a fuel inlet Inlet channel is arranged.
  • the inlet channel in the spray hole has a much larger cross section than that with the fuel injector open in the combustion chamber of the Internal combustion engine opening spray hole.
  • this known fuel injector has the disadvantage that one for several spray holes common inlet channel is provided in the closing head, so that between the inlet channel and individual spray holes acute transition angles are formed.
  • this has the Disadvantage that the fuel flow when crossing the flow between the common inlet channel and the individual Spray holes must be redirected sharply so that the injection jet at these spray holes is strong Has turbulence that is homogeneous and even Fuel injection into the combustion chamber to be supplied Impair the internal combustion engine.
  • homogeneous as possible Beam guidance from the inlet channel to the spray hole outlet in the combustion chamber of the internal combustion engine and thus as possible uniform fuel injection jets on everyone Injection orifices are thus known Fuel injector not possible.
  • the fuel injector according to the invention with the Features of claim 1 has the advantage that the in the Spray hole already aligned with the same axis and wide inlet channel forced homogenization of the flow at the transition into the spray hole creates almost identical inflow conditions, so that a uniform speed distribution in the beam exit cross-section occurs, and thus leads to a uniform spray pattern.
  • the conversion of pressure energy into kinetic energy takes place directly at the relatively short spray hole, so that high-energy spray jets are formed in the combustion chamber atomize fine droplets. Further advantages result from the Refinements of the fuel injector according to dependent claims.
  • FIG. 1 shows a fuel injector in longitudinal section
  • Figure 2 shows a detail A of the combustion-end injection end of the fuel injector 1 in section on an enlarged scale
  • figure 3 shows a section B of the spray hole area of the injection nozzle Figure 2 in section on an even larger scale.
  • the fuel injection nozzle has a nozzle body 10, which means a union nut 11 is clamped to a nozzle holder 12.
  • a valve needle 15 is slidably mounted on combustion chamber end carries a closing head 16.
  • On the combustion chamber side End of the closing head 16 is a ring 19 with a frustoconical valve cone 17 firmly attached to the hollow cone-shaped valve seat 18 cooperates on the nozzle body 10.
  • radially offset from the valve cone Section of the closing head 16 is a piston slide 20 formed in a guide section close to the valve seat 18 23 a cylinder bore 22 is guided in the nozzle body 10, the one Pressure chamber 21 forms.
  • At least one spray hole 25 is arranged in the piston slide 20, whose mouth 26 is in the jacket of the spool 20 and only has a small or no distance from the valve cone 17, so that its outlet cross-section during the opening stroke of the closing head 16 is continuously released from the inner edge of the valve seat 18.
  • the longitudinal axis of the spray hole 25 runs in one very obtuse angle a in relation to the axis of displacement of the valve needle 15 and the nozzle body 10. This angle a is the shape of the Adjusted combustion chamber of the internal combustion engine.
  • the length 1 of the spray hole 25 is in the range of 2-4 times its width d.
  • the spray hole 25 have a different cross-section, for example one oval, triangular or polygonal, depending on which cross-section should be released at the respective opening stroke.
  • the spray hole 25 is filled with fuel from the pressure chamber 21 supplied an inlet channel 27 in the lock box 16.
  • This inlet channel 27 preferably runs exactly coaxially, or alternatively only with slight deviation from the axis of extension of the spray hole 25
  • Inlet 28 is located in the end face facing the pressure chamber 21 of the closing head 16 and the piston slide 20 next to the in the middle adjoining shaft 14 of the valve needle 15.
  • the transition is formed between the inlet channel 27 and the injection cross section 25, that the pressure energy is converted into kinetic energy with little loss is, for example as a funnel 29. This ensures that the pressure conversion actually directly at the cross-section of the spray takes place and not already in the inlet channel 27, is its cross section by a minimum factor larger than the actual spray cross-section.
  • the cross section of the preferably circular inlet channel 27 can also deviate from the circular cross-section and one Spray hole 25 have adapted other cross-sectional shape. Can too the preferably straight inlet channel 27 is curved be. With such an alternative, however, it is essential that be end portion merging with the spray hole with only slight Curvature passes tangentially into the spray hole.
  • the closing head 16 is that described above Embodiment of the fuel injector with only one Spray hole 25 and a single inlet channel 27 shown.
  • fuel injectors are usually used with several spray holes, which are on a circle of the Closing head are evenly or irregularly distributed and also can have the same or different spray angles.
  • the valve needle 15 is slidably mounted in a guide bore 35 in the nozzle body 10, to which a collection chamber 36 and an annular gap 37 connecting it to the pressure chamber 21 connect downstream.
  • a closing spring 40 which is arranged in a spring chamber 39 in the nozzle holder 12.
  • the closing spring 40 is supported by a distance sleeve 41 and a slotted stop plate 42 on the nozzle body 10 and pushes a shim 43 against a fixed end of the valve needle 15 support ring 44.
  • the stem of the valve needle 15 at the level of the stop disk 42, forming a stop collar 45, which has the distance h g from the stop disk 42 in the closed position of the valve needle 15.
  • An inlet channel 47 in the nozzle holder 12 and in the nozzle body 10 leads from the connecting piece 46 to the collecting chamber 36 in the nozzle body 10. Furthermore, a leakage oil channel 48 connects the spring chamber 39 to a connection 49.
  • the fuel injector described works as follows: In the Injection pauses, the closing spring 40 also presses the valve needle 15 the valve cone 17 on the closing head 16 against the valve seat 18 on Nozzle body 10, the mouth of the spray holes 30 from the in Guide section 33 covers the surrounding wall of the nozzle body 10 are and the sealing cone 17 is tight against the valve seat 18.
  • a pressure builds up in this, which on the piston slide 20th the closing head 16 acts.
  • approved spray cross section at the mouth of the spray holes 25 fuel flows in the form of bundled spray jets the valve cone 17 and the valve seat 18 in the combustion chamber of the internal combustion engine.
  • the Closing spring supports the valve needle by the combustion chamber gas pressure 40 15 back again, the spray holes 25 initially being closed and then the valve cone 17 of the closing head 16 on Valve seat 18 of the nozzle body 10 closes tightly again.

Landscapes

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

Claims (4)

  1. Buse d'injection de carburant pour moteur à combustion interne comportant un corps de buse (10) dans lequel est formé un canal d'alimentation de carburant (37), et un siège de soupape (18) à l'extrémité située du côté de la chambre de combustion, ainsi qu'une aiguille d'injecteur (15) coulissant dans le corps de buse (10) et chargée par ressort dans le sens de la fermeture, cette aiguille ayant à son extrémité située du côté de la chambre de combustion, une tête d'obturation coopérant avec le siège de soupape (18) contre le corps de buse (10), s'ouvrant vers l'extérieur et guidée dans le corps de buse (10), avec au moins un orifice d'éjection (25) qui se commande à l'ouverture en fonction de la course de l'aiguille et un canal d'alimentation (27) reliant cet orifice au canal d'alimentation de carburant (37), le canal d'alimentation (27) ayant, dans la tête d'obturation (16), une section beaucoup plus grande que celle de l'orifice d'éjection (25), et étant aligné selon sa longueur, essentiellement de façon coaxiale à l'orifice d'éjection 25,
    caractérisée en ce qu'
    un canal d'alimentation propre (27) est associé à chaque orifice d'éjection (25).
  2. Buse d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    l'ouverture (28), du côté de l'entrée du canal d'alimentation (27), inclinée par rapport à l'axe longitudinal de l'aiguille (15), se trouve dans la face frontale de la tête d'obturation (16), qui n'est pas tournée vers la chambre de combustion.
  3. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le passage (29) du canal d'alimentation (27) à l'orifice d'éjection (25) est continu.
  4. Buse d'injection de carburant selon l'une des revendications 1 à 3,
    caractérisée en ce que
    la tête d'obturation (16) comporte plusieurs canaux d'alimentation (27) qui ne se croisent pas.
EP94102949A 1993-03-29 1994-02-28 Buse d'injection de combustible pour moteurs à combustion interne Expired - Lifetime EP0619426B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4310154 1993-03-29
DE4310154A DE4310154A1 (de) 1993-03-29 1993-03-29 Kraftstoff-Einspritzdüse für Brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0619426A1 EP0619426A1 (fr) 1994-10-12
EP0619426B1 true EP0619426B1 (fr) 1999-08-11

Family

ID=6484133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102949A Expired - Lifetime EP0619426B1 (fr) 1993-03-29 1994-02-28 Buse d'injection de combustible pour moteurs à combustion interne

Country Status (4)

Country Link
US (1) US5405088A (fr)
EP (1) EP0619426B1 (fr)
JP (1) JPH06317234A (fr)
DE (2) DE4310154A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL175378B1 (pl) * 1993-08-18 1998-12-31 Orbital Eng Australia Dysza wtryskiwacza
DE4440369A1 (de) * 1994-11-11 1996-05-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE4442764A1 (de) * 1994-12-01 1996-06-05 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19602615A1 (de) * 1996-01-25 1997-07-31 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19618698A1 (de) * 1996-05-09 1997-11-13 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19753162A1 (de) * 1997-11-29 1999-06-02 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
GB9813743D0 (en) * 1998-06-26 1998-08-26 Lucas Ind Plc Fuel injector
DE19839632A1 (de) * 1998-08-31 2000-03-02 Siemens Ag Kraftstoffeinspritzdüse mit Hubbegrenzung
US6748872B2 (en) * 2001-11-08 2004-06-15 Bombardier Motor Corporation Of America Swirl-producing fuel injection nozzle and system and method incorporating same
US20040154729A1 (en) * 2003-02-11 2004-08-12 Leboeuf William E. Method of producing a processing substrate
JP5668984B2 (ja) * 2011-05-31 2015-02-12 株式会社デンソー 燃料噴射装置
BE1020586A3 (nl) * 2012-07-18 2014-01-07 Jet Zone Bvba Een spuitmondstuk geheel.

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE802968C (de) * 1948-12-30 1951-02-26 Bernhard Bischof Einspritzduese fuer Brennkraftmaschinen
DE862976C (de) * 1950-10-03 1953-01-15 Stuttgarter Motorzubehoer G M Plansitzduese mit Steuerzapfen
US4197997A (en) * 1978-07-28 1980-04-15 Ford Motor Company Floating ring fuel injector valve
DE3115135A1 (de) * 1981-04-15 1982-10-28 Audi Nsu Auto Union Ag, 7107 Neckarsulm Kraftstoffeinspritzventil fuer einspritz-brennkraftmaschinen
GB2113303A (en) * 1982-01-23 1983-08-03 Lucas Ind Plc I.C. Engine fuel injection nozzle
DE3221770A1 (de) * 1982-06-09 1983-12-15 Volkswagenwerk Ag, 3180 Wolfsburg Kraftstoffeinspritzduese
US4693424A (en) * 1985-07-15 1987-09-15 General Motors Corporation Poppet covered orifice fuel injection nozzle
DE3719459A1 (de) * 1987-06-11 1988-12-29 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
US4750675A (en) * 1987-10-05 1988-06-14 General Motors Corporation Damped opening poppet covered orifice fuel injection nozzle
DE3737896A1 (de) * 1987-11-07 1989-05-18 Bosch Gmbh Robert Kraftstoff-einspritzduese, insbesondere fuer brennkraftmaschinen mit direkteinspritzung
US4958771A (en) * 1989-06-21 1990-09-25 General Motors Corporation Injection nozzle
US5127584A (en) * 1991-05-06 1992-07-07 General Motors Corporation Fuel injection nozzle
WO1993004277A1 (fr) * 1991-08-15 1993-03-04 Yaroslavsky Zavod Toplivnoi Apparatury Procede et injecteur d'alimentation en carburant pour moteur a combustion interne

Also Published As

Publication number Publication date
US5405088A (en) 1995-04-11
DE59408599D1 (de) 1999-09-16
DE4310154A1 (de) 1994-10-06
JPH06317234A (ja) 1994-11-15
EP0619426A1 (fr) 1994-10-12

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