EP1045982A1 - Gicleur de carburant pour moteurs a combustion interne a auto-allumage - Google Patents

Gicleur de carburant pour moteurs a combustion interne a auto-allumage

Info

Publication number
EP1045982A1
EP1045982A1 EP99947222A EP99947222A EP1045982A1 EP 1045982 A1 EP1045982 A1 EP 1045982A1 EP 99947222 A EP99947222 A EP 99947222A EP 99947222 A EP99947222 A EP 99947222A EP 1045982 A1 EP1045982 A1 EP 1045982A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
seat surface
valve seat
injection nozzle
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.)
Granted
Application number
EP99947222A
Other languages
German (de)
English (en)
Other versions
EP1045982B1 (fr
Inventor
Axel Hockenberger
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 EP1045982A1 publication Critical patent/EP1045982A1/fr
Application granted granted Critical
Publication of EP1045982B1 publication Critical patent/EP1045982B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • 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
    • 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 Kraf material 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 Edition, 1995, pages 526 ff.
  • the spray holes are cylindrical.
  • the conversion of the fuel pressure into a speed of the injected fuel jet takes place within a small range, which results in high efficiency losses.
  • the object of the invention is to develop a fuel injection nozzle of the type described in the introduction in such a way that its efficiency in converting the fuel pressure into a speed of the fuel jet fed in and thereby the efficiency of the distribution of the fuel in the engine are increased.
  • the fuel injection nozzle is also intended to reduce NO x and particle values.
  • the spray hole cross section to the combustion chamber of the internal combustion engine widens again after an initial narrowing, an optimal conversion of the pressure into a speed of the fuel jet and thus a high efficiency in the distribution of the fuel in the internal combustion engine is achieved in a particularly simple manner. Namely, while higher speeds are generated in the convergent area of the fuel injection nozzle, the generation of a spray with small particles is made possible in its divergent part. This advantageously shifts the range of the maximum distribution away from the fuel injector due to higher speeds of the fuel jet, which occurs in the fuel injector known from the prior art, by the divergent part of the Counteracted fuel injector. By optimally converting the pressure of the fuel jet into its speed, this also reduces the tendency to cavitation.
  • the smallest spray hole cross-section advantageously extends in the axially central region of the spray hole opening, so that the divergent and the convergent spray hole region have approximately the same axial extent.
  • such a fuel injection nozzle can be produced particularly cost-effectively, for example by spark erosion.
  • the spray holes advantageously have one of the following cross-sectional shapes: a circular shape, an elliptical shape, a slit-like shape.
  • FIG. 1 shows a longitudinal sectional view of the lower region of a fuel injection valve according to the invention and FIG. 2 shows an enlarged detail, designated II in FIG. 1, of the fuel injection nozzle shown in FIG. 1.
  • a nozzle body 10 has a bore 12, the base of which is formed in a dome 13 at the end on the injection side as a conical valve seat surface 14.
  • a correspondingly shaped closing cone 31 at the tip of a valve needle 30 interacts with this valve seat surface 14, from which the spray holes 20 penetrate the tip 13 and open into the combustion chamber.
  • the valve needle 30, which is loaded by a closing spring (not shown), has a guide section which is displaceably guided in the inlet-side region of the nozzle body 10 and a subsequent section which is offset in diameter via a pressure shoulder and on the free walls of which the closing cone 31 is formed.
  • the following section of the nozzle needle 30 has a smaller thickness than the width of the surrounding 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 (not shown) connected to a feed bore.
  • the spray hole 20 has a cross section widening towards the combustion chamber of the internal combustion engine after the initial narrowing.
  • a convergent part 21 follows a divergent part 22.
  • the spray hole 20 has the shape of a "Laval nozzle".
  • Laval nozzle As with a Laval nozzle, higher speeds of the fuel jet to be injected are generated in the convergent region 21 of the fuel injection nozzle, whereas in the divergent part of the nozzle a spray with small particles is produced.
  • An undesirable shift of the range of the maximum distribution away from the nozzle due to the higher speed of the fuel injection part is thus counteracted by means of the divergent part 22 of the fuel injection nozzle.
  • the resulting "gentler" conversion of the pressure of the fuel injection jet into its speed reduces the tendency of the fuel injection nozzle to cavitate.
  • Such a fuel injector can be produced in a very advantageous manner by spark erosion, wherein the variation in the cross-sectional shape of the spray hole 20 can be produced in a simple manner by varying the parameters voltage, current intensity and feed rate.
  • the cost of producing such a spray hole 20 can be lower than in the case of conical spray holes known from the prior art, in which the inlet cross section is larger than the outlet cross section. Since the inlet openings in fuel injection nozzles known from the prior art are in many cases additionally rounded off hydroerosively, the costs for producing a fuel injection nozzle equipped with spray holes 20 described above can even be reduced because the time to round the entry openings can be reduced or the process can be omitted.

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

Gicleur de carburant pour moteurs à combustion interne à auto-allumage, qui comporte un corps (10) de gicleur dans lequel est formé, au niveau de l'extrémité d'injection d'un alésage (12), une surface conique (14) de siège de soupape depuis laquelle partent des trous d'injection (20), ainsi qu'une aiguille (30) de soupape qui s'ouvre par une force opposée à une force de fermeture, dans une direction opposée à celle du flux de carburant. Cette aiguille, qui est placée mobile dans la zone d'entrée de l'alésage (12) se trouvant à l'opposé de l'extrémité d'injection, possède, sur son côté adjacent à la surface (14) de siège de soupape, une bille de fermeture (31) qui coopère avec ladite surface (14). Selon la présente invention, ledit gicleur est caractérisé par le fait que la section transversale des trous d'injection débouchant dans la chambre de combustion du moteur à combustion interne s'élargit à nouveau après un rétrécissement initial.
EP99947222A 1998-10-15 1999-07-16 Gicleur de carburant pour moteurs a combustion interne a auto-allumage Expired - Lifetime EP1045982B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19847460 1998-10-15
DE19847460A DE19847460A1 (de) 1998-10-15 1998-10-15 Kraftstoffeinspritzdüse für selbstzündende Brennkraftmaschinen
PCT/DE1999/002204 WO2000023707A1 (fr) 1998-10-15 1999-07-16 Gicleur de carburant pour moteurs a combustion interne a auto-allumage

Publications (2)

Publication Number Publication Date
EP1045982A1 true EP1045982A1 (fr) 2000-10-25
EP1045982B1 EP1045982B1 (fr) 2004-03-24

Family

ID=7884510

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99947222A Expired - Lifetime EP1045982B1 (fr) 1998-10-15 1999-07-16 Gicleur de carburant pour moteurs a combustion interne a auto-allumage

Country Status (6)

Country Link
EP (1) EP1045982B1 (fr)
JP (1) JP2002527678A (fr)
KR (1) KR100627745B1 (fr)
BR (1) BR9917602A (fr)
DE (2) DE19847460A1 (fr)
WO (1) WO2000023707A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10105674A1 (de) * 2001-02-08 2002-08-29 Siemens Ag Kraftstoffeinspritzdüse für eine Brennkraftmaschine
JP3879909B2 (ja) * 2001-03-29 2007-02-14 株式会社デンソー 燃料噴射装置
DE10124745A1 (de) * 2001-05-21 2003-03-27 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10360773A1 (de) * 2003-12-23 2005-07-28 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102004049280A1 (de) * 2004-10-09 2006-04-13 Robert Bosch Gmbh Brennstoffeinspritzventil
KR100742202B1 (ko) * 2005-10-13 2007-07-24 진명이십일 (주) 인젝터의 분사노즐 구조
DE102006013962A1 (de) * 2006-03-27 2007-10-04 Robert Bosch Gmbh Einspritzdüse mit Spritzkanälen sowie Verfahren zur Einbringung von Kanälen
GB0712403D0 (en) 2007-06-26 2007-08-01 Delphi Tech Inc A Spray Hole Profile
DE102008051365B4 (de) 2008-10-15 2010-07-01 L'orange Gmbh Kraftstoff-Einspritzventil für Brennkraftmaschinen
JP5299293B2 (ja) * 2010-01-19 2013-09-25 株式会社デンソー 燃料噴射弁およびその製造方法
AT511880B1 (de) * 2011-09-06 2013-12-15 Bosch Gmbh Robert Verschleissoptimierte herstellung von konischen spritzlöchern
EP2884090B1 (fr) 2013-12-11 2018-02-21 Continental Automotive GmbH Corps de buse et soupape d'injection de carburant
JP6247167B2 (ja) * 2014-06-24 2017-12-13 トヨタ自動車株式会社 燃料噴射弁の加工方法
JP2017106418A (ja) * 2015-12-11 2017-06-15 株式会社デンソー 燃料噴射弁及びその製造方法
CN110805513B (zh) * 2018-08-05 2021-06-01 大连理工大学 一种带扭转式椭圆形喷孔的喷嘴

Family Cites Families (4)

* 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
DE2557772A1 (de) * 1975-12-20 1977-06-23 Kloeckner Humboldt Deutz Ag Brennstoffeinspritzventil
JPH05231273A (ja) * 1992-02-19 1993-09-07 Hino Motors Ltd 燃料噴射ノズル及びその製造方法
EP0809017A1 (fr) * 1996-05-22 1997-11-26 Steyr-Daimler-Puch Aktiengesellschaft Injecteur de carburant à deux étages pour moteurs à combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0023707A1 *

Also Published As

Publication number Publication date
JP2002527678A (ja) 2002-08-27
KR20010033112A (ko) 2001-04-25
BR9917602A (pt) 2002-10-01
DE59908951D1 (de) 2004-04-29
KR100627745B1 (ko) 2006-09-26
EP1045982B1 (fr) 2004-03-24
WO2000023707A1 (fr) 2000-04-27
DE19847460A1 (de) 2000-04-20

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