WO2000032928A1 - Injecteur de carburant pour moteur a combustion interne a allumage automatique - Google Patents

Injecteur de carburant pour moteur a combustion interne a allumage automatique Download PDF

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Publication number
WO2000032928A1
WO2000032928A1 PCT/DE1999/002301 DE9902301W WO0032928A1 WO 2000032928 A1 WO2000032928 A1 WO 2000032928A1 DE 9902301 W DE9902301 W DE 9902301W WO 0032928 A1 WO0032928 A1 WO 0032928A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve seat
section
seat surface
internal combustion
cross
Prior art date
Application number
PCT/DE1999/002301
Other languages
German (de)
English (en)
Inventor
Detlev Potz
Bernd Dittus
Stefan Haug
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 WO2000032928A1 publication Critical patent/WO2000032928A1/fr

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
    • F02M61/1846—Dimensional characteristics of 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
    • F02M61/16—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

Definitions

  • the invention relates to a fuel injection nozzle for self-igniting internal combustion engines according to the preamble of claim 1.
  • Such fuel injection nozzles are known, for example, from DE 43 03 813 Cl and from the book publication: Bosch Automotive Pocket Book, 22nd editions, 1995.
  • the atomization mechanism of the injected fuel is not based on an exchange of impulses of the injected fuel jet with the combustion chamber trough wall, but rather on cavitation or turbulence at the spray hole inlet and thus on a nozzle as close as possible Atomization.
  • known fuel injection nozzles it is problematic to influence the location of the atomization, the dynamic jet cone angle and the depth of penetration of the injection jet via the geometry of the spray hole. As a rule, a minimum penetration depth cannot be undershot in the case of cylindrical spray holes of the known type.
  • the object of the invention is to provide a fuel injection nozzle in which atomization of the fuel jet to be injected is generated as close as possible to the fuel injection nozzle.
  • the spray hole cross section widens outwards in the direction of the side facing away from the valve seat surface, ie towards the combustion chamber of the internal combustion engine, it is possible to generate cavitation or turbulence already at the spray hole inlet, so that the fuel jet decays much closer to the nozzle.
  • the difference between the cross-section of the spray hole at the inlet and outlet of the jet allows the trough geometry for the respective combustion chamber geometry and the jet behavior to be set to the optimum jet penetration depth.
  • Both the valve seat surface and the closing surface are preferably each conical.
  • the spray holes have an outlet cross section facing away from the valve seat surface, the average diameter of which is at least 2% larger than that of the inlet cross section facing the valve seat surface. This ensures that the jet decays particularly close to the fuel injector.
  • the inlet cross-section and / or the outlet cross-section advantageously has one of the following shapes: a circular, an elliptical, a slit-like shape. In any case, the outlet cross-section has the largest diameter.
  • a correspondingly shaped closing cone 31 at the tip of a valve needle 30 interacts with this valve seat surface 14, from which the nozzle 13 penetrates and opens into the combustion chamber.
  • the valve needle 30, which is loaded by a closing spring (not shown), has one in the input-side area of the Nozzle body 10 displaceably guided guide section and a subsequent section with a diameter offset over a pressure shoulder, on the free walls of which the closing cone 31 is formed.
  • the subsequent section of the nozzle needle 30 has a smaller thickness than the width of the surrounding blind bore 12, so that it is surrounded by an annular gap which is expanded in a manner known per se at the pressure shoulder to form a chamber connected to a supply bore (not shown).
  • the spray hole 20 has an inlet cross-section 21 and an outlet cross-section 22, the outlet cross-section 22 being larger than the inlet cross-section 21. It has been shown that the diameter of the outlet cross-section 22 is advantageously at least 2% larger than the diameter of the inlet cross-section 21. On this In this way, a desired cavitation / turbulence is already generated at the inlet cross section 21, as a result of which the fuel jet disintegrates much closer to the nozzle body 10 than, for example, in the case of a fuel injection nozzle with cylindrical spray holes known from the prior art. In this way, in particular in the case of internal combustion engines for commercial vehicles, it is avoided that an impulse exchange of the injected fuel jet occurs with the combustion chamber trough wall.
  • the optimum jet penetration depth for the respective combustion chamber bowl geometry / swirl behavior can be determined via the difference between the spray hole cross section at the spray hole inlet 21 and the spray hole outlet 22.
  • the mode of operation described above does not depend on the shape of the spray hole cross section.
  • the spray hole 20 can be circular, elliptical or slit-shaped.
  • the function is also independent of the course between the entry and the exit.
  • a combination of the spray hole geometry described above is also possible with other blind hole geometries of fuel injection nozzles.
  • such a configuration of the spray hole can also be used with seat hole nozzles in the commercial vehicle sector.

Landscapes

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

Abstract

Injecteur de carburant pour moteur à combustion interne comportant un corps d'injecteur (10) dans lequel est située à l'extrémité d'injection d'un alésage (12) une surface de siège de soupape (14), ainsi qu'un pointeau de soupape (30) s'ouvrant à l'encontre d'une force de fermeture s'opposant au sens d'écoulement du carburant d'un ou de plusieurs orifices d'injection (20), ce pointeau pouvant être guidé dans la zone d'entrée de l'alésage (12) dirigée vers l'extrémité côté injection et présentant sur son côté tourné vers le siège de soupape (14) une surface de fermeture (31), associée au siège de soupape, caractérisé par le fait que la section transversale de l'orifice d'injection s'agrandit vers l'extérieur dans le sens de la chambre de combustion du moteur à combustion interne.
PCT/DE1999/002301 1998-11-27 1999-07-27 Injecteur de carburant pour moteur a combustion interne a allumage automatique WO2000032928A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998154828 DE19854828A1 (de) 1998-11-27 1998-11-27 Kraftstoffeinspritzdüse für selbstzündende Brennkraftmaschinen
DE19854828.1 1998-11-27

Publications (1)

Publication Number Publication Date
WO2000032928A1 true WO2000032928A1 (fr) 2000-06-08

Family

ID=7889267

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/002301 WO2000032928A1 (fr) 1998-11-27 1999-07-27 Injecteur de carburant pour moteur a combustion interne a allumage automatique

Country Status (2)

Country Link
DE (1) DE19854828A1 (fr)
WO (1) WO2000032928A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7490784B2 (en) 2002-06-10 2009-02-17 Siemens Aktiengesellschaft Injector for injecting fuel
DE10225683A1 (de) * 2002-06-10 2004-01-08 Siemens Ag Injektor zum Einspritzen von Kraftstoff
DE10307931A1 (de) 2003-02-25 2004-10-28 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102008051365B4 (de) 2008-10-15 2010-07-01 L'orange Gmbh Kraftstoff-Einspritzventil für Brennkraftmaschinen
DE102008055069A1 (de) 2008-12-22 2010-07-01 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR446892A (fr) * 1912-08-03 1912-12-17 Maschf Augsburg Nuernberg Ag Dispositif pour l'admission du combustible dans les moteurs à combustion interne
GB611620A (en) * 1945-11-13 1948-11-02 Texaco Development Corp Improvements in or relating to the operation of internal combustion engines having airless injection of fuel
FR1056529A (fr) * 1951-07-20 1954-03-01 Tuyère d'injection pour moteurs à combustion interne
FR2335705A1 (fr) * 1975-12-20 1977-07-15 Kloeckner Humboldt Deutz Ag Injecteur de carburant
JPS6394021A (ja) * 1986-10-08 1988-04-25 Mazda Motor Corp 直噴式デイ−ゼルエンジン
JPH0378562A (ja) * 1989-08-21 1991-04-03 Toyota Central Res & Dev Lab Inc 燃料噴射弁
US5054691A (en) * 1989-11-03 1991-10-08 Industrial Technology Research Institute Fuel oil injector with a floating ball as its valve unit
JPH09126095A (ja) * 1995-10-31 1997-05-13 Toyota Central Res & Dev Lab Inc 燃料噴射弁
EP0945612A1 (fr) * 1998-03-26 1999-09-29 Toyota Jidosha Kabushiki Kaisha Injecteur à combustible pour un moteur à combustion interne

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR446892A (fr) * 1912-08-03 1912-12-17 Maschf Augsburg Nuernberg Ag Dispositif pour l'admission du combustible dans les moteurs à combustion interne
GB611620A (en) * 1945-11-13 1948-11-02 Texaco Development Corp Improvements in or relating to the operation of internal combustion engines having airless injection of fuel
FR1056529A (fr) * 1951-07-20 1954-03-01 Tuyère d'injection pour moteurs à combustion interne
FR2335705A1 (fr) * 1975-12-20 1977-07-15 Kloeckner Humboldt Deutz Ag Injecteur de carburant
JPS6394021A (ja) * 1986-10-08 1988-04-25 Mazda Motor Corp 直噴式デイ−ゼルエンジン
JPH0378562A (ja) * 1989-08-21 1991-04-03 Toyota Central Res & Dev Lab Inc 燃料噴射弁
US5054691A (en) * 1989-11-03 1991-10-08 Industrial Technology Research Institute Fuel oil injector with a floating ball as its valve unit
JPH09126095A (ja) * 1995-10-31 1997-05-13 Toyota Central Res & Dev Lab Inc 燃料噴射弁
EP0945612A1 (fr) * 1998-03-26 1999-09-29 Toyota Jidosha Kabushiki Kaisha Injecteur à combustible pour un moteur à combustion interne

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 332 (M - 738) 8 September 1988 (1988-09-08) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 244 (M - 1127) 24 June 1991 (1991-06-24) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 09 30 September 1997 (1997-09-30) *

Also Published As

Publication number Publication date
DE19854828A1 (de) 2000-05-31

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