EP0929742B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP0929742B1
EP0929742B1 EP98916834A EP98916834A EP0929742B1 EP 0929742 B1 EP0929742 B1 EP 0929742B1 EP 98916834 A EP98916834 A EP 98916834A EP 98916834 A EP98916834 A EP 98916834A EP 0929742 B1 EP0929742 B1 EP 0929742B1
Authority
EP
European Patent Office
Prior art keywords
weight
nozzle body
hardened
fuel injector
valve seat
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
EP98916834A
Other languages
German (de)
English (en)
Other versions
EP0929742A1 (fr
Inventor
Max Seitter
Friedrich MÜHLEDER
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 EP0929742A1 publication Critical patent/EP0929742A1/fr
Application granted granted Critical
Publication of EP0929742B1 publication Critical patent/EP0929742B1/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
    • F02M61/16—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
    • F02M61/166—Selection of particular materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/19—Nozzle materials

Definitions

  • the invention relates to a fuel injector for Internal combustion engines with a nozzle body, in which a valve needle with a sealing surface slidable is mounted on a sealing surface adapted to it comes to the system, which on an inner wall area of a Forehead of the nozzle body is formed and in the at least one spray hole is provided, both the inner wall area with the sealing surface arranged on it of the nozzle body as well as its outer wall area are hardened.
  • Such a fuel injector for internal combustion engines goes for example from EP 0 233 190 B1 out.
  • This is the one with the valve seat provided inner wall area of the forehead by hardening of the outer layer with a greater hardness than that Outside wall area and that between the valve seat surface and the opposite outer wall area middle edge area.
  • the nozzle body of these fuel injectors is made made of case hardening steel, which is used to train the different Degrees of hardness are carburized differently.
  • Such fuel injectors are, for example used in diesel fuel injection systems where they exposed to very high temperatures. If with direct injection diesel engines, for example can be operated in engine braking mode very high temperatures at the diesel injectors arise, whereby they "soft annealed” and thereby for further operation may become unsuitable (wear, Risk of breakage).
  • the invention is therefore based on the object generic fuel injector to that effect improve that on the one hand at very high temperatures can be used, in particular the above Soft annealing mentioned in connection with diesel engines should be avoided, and that on the other hand they have a high Has corrosion resistance, so that also an insert is possible in gasoline direct injection systems.
  • the Fuel injector should be as simple as possible and therefore be inexpensive to manufacture.
  • Spray holes are hardened.
  • stainless martensitic steels Steels with the following composition in question: ⁇ 0.1, preferably 0.01% by weight of C; of 0.03 up to 0.3, preferably 0.1% by weight of N; from 0.01 to 1.0, preferably 0.06% by weight of Si; from 10.0 to 20.0, preferably 13.7% by weight of Cr; ⁇ 5.0, preferably 1.5 % By weight Mo; ⁇ 0.5, preferably 0% by weight Nb; ⁇ 0.5, preferably 0.1% by weight of V and alloy additives to suppress ⁇ -ferrite.
  • Alloy additives with the following composition: from 0.01 to 1.0, preferably 0.03% by weight Mn; ⁇ 5.0, preferably 2.2% by weight Ni; ⁇ 5.0, preferably 2.7% by weight of Co added.
  • the nozzle body is advantageously case hardened at a temperature of 1050 to 1200 ° C, preferably at 1100 ° C, at a pressure of 0.5 to 10 bar, preferably at 3 bar over a period of 1 h hardened to 30 h, preferably 4 h.
  • the advantages are: There is a better one Machinability of the uncured raw material.
  • the Surface hardening takes place with high manufacturing reliability, for uniform surface hardness and hardening, especially with the spray holes leads forming holes without cleaning problems arise.
  • Due to a simple production, the Fuel injectors are not just technically simple Way, but also made particularly inexpensive are not between fuel injectors for diesel injection systems and fuel injectors differentiated for gasoline injection systems must become.
  • FIG. 1 is a schematic longitudinal section through the injection-side end portion of an embodiment a fuel injector.
  • the injection nozzle shown in Figure 1 has one Nozzle body 10 in which a valve needle 20 is slidably mounted.
  • the valve needle 20 instructs at its lower end a conical sealing surface 22, the on a matching and therefore conical valve seat 12 comes to the plant.
  • the valve seat surface 12 is on an inner wall region 31 of a forehead 30 of the Nozzle body 10 formed. From the valve seat surface 12 go out of several spray holes 32 which the wall of Pierce forehead 30 at an angle to the nozzle axis.
  • the inner wall of the nozzle body 10 is an annular space 13 formed in which a fuel supply line, not shown opens.
  • the valve needle 20 is one also not shown valve spring against the Valve seat surface 12 pressed. If the fuel pressure in the Annulus 13 has risen to a predetermined value, becomes the valve needle 20 against the force of the valve spring raised and the fuel through the spray holes 32 sprayed.
  • the Cone angle of the sealing surface 22 on the valve needle 20 be chosen slightly larger than the angle of the valve seat surface 12, so that initially on the upper edge 24 of the Sealing surface 22 gives the highest sealing pressure.
  • sealing surface 22 can also be spherical and the Valve seat and the end cap 30 hollow spherical be trained.
  • the spray holes 32 can also below the sealing surface 22 may be arranged in the end cap 30.
  • valve needle 20 In the operation of the fuel injector, this becomes very highly stressed. This high stress results in one that the valve needle 20 by permanent The fuel injector opens and closes continuously meets the valve seat surface 12, on the other but also from the fact that the entire fuel injector for example, in overrun mode with a diesel engine operated vehicle in which the Engine braking effect is used, a very high Temperature is exposed.
  • the fuel injector is made up of a stainless martensitic steel, for example of the following composition: 0.01% by weight of C; 0.1 % By weight N; 0.06% by weight Si; 13.7% by weight of Cr; 1.5 % By weight Mo; 0.1% by weight V and alloy additives for the suppression of ⁇ -ferrite with the following composition: 0.03% by weight Mn; 2.2% by weight Ni; 2.7% by weight Co, which is hardened by case hardening with nitrogen.
  • a stainless martensitic steel for example of the following composition: 0.01% by weight of C; 0.1 % By weight N; 0.06% by weight Si; 13.7% by weight of Cr; 1.5 % By weight Mo; 0.1% by weight V and alloy additives for the suppression of ⁇ -ferrite with the following composition: 0.03% by weight Mn; 2.2% by weight Ni; 2.7% by weight Co, which is hardened by case hardening with nitrogen.
  • the case hardening with nitrogen is preferably carried out at a temperature of 1100 ° C and a pressure of 3 bar over a period of 4 h.

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 (3)

  1. Injecteur de carburant pour des moteurs à combustion interne comprenant un corps d'injecteur (10) recevant une aiguille (20) montée coulissante et comportant une surface d'étanchéité (2) venant en appui contre une surface formant siège de soupape (12), adaptée, réalisée au niveau de la paroi intérieure (31) d'une coupelle frontale (30) du corps de buse (10) et comportant au moins un orifice d'éjection (32),
    à la fois la zone de paroi intérieure (31) avec sa surface formant siège de soupape (12) du corps (10) de l'injecteur et sa zone de paroi extérieure étant traitées thermiquement,
    caractérisé en ce que
    le corps de buse (10) est en un acier martensitique inoxydable traité par cémentation avec de l'azote, et les orifices d'éjection (32) sont également traités, l'acier ayant la composition suivante :
    < 0,1 de préférence 0,01 % C ;
    de 0,03 à 0,3 de préférence 0,1 % N ;
    0,01 à 1,0 de préférence 0,06 % Si ;
    10,0 à 20,0 de préférence 13,7 % Cr ;
    < 5,0 de préférence 1,5 % Mo ;
    < 0,5 de préférence 0 % Nb ;
    < 0,5 de préférence 0,1 % V ; et
    des additifs d'alliage pour éviter la ferrite δ.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce qu'
    on ajoute à l'acier des additifs d'alliage pour éliminer la ferrite δ et ayant la composition suivante : entre 0,01 et 1,0 et de préférence 0,03 % en poids Mn, < 5,0, de préférence 2,2 % en poids Ni ; < 5,0, de préférence 2,7 % en poids Co.
  3. Injecteur de carburant selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce qu'
    on traite le corps de buse (10) par cémentation à une température comprise entre 1050 et 1200°C, de préférence à 1100°C pour une pression de 0,5 à 10 bars et de préférence à 3 bars et pendant une durée de 1 à 30 h, de préférence 4 h.
EP98916834A 1997-07-31 1998-03-04 Injecteur de carburant Expired - Lifetime EP0929742B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29713628U 1997-07-31
DE29713628U DE29713628U1 (de) 1997-07-31 1997-07-31 Kraftstoffeinspritzdüse
PCT/DE1998/000620 WO1999006692A1 (fr) 1997-07-31 1998-03-04 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP0929742A1 EP0929742A1 (fr) 1999-07-21
EP0929742B1 true EP0929742B1 (fr) 2003-01-22

Family

ID=8043949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98916834A Expired - Lifetime EP0929742B1 (fr) 1997-07-31 1998-03-04 Injecteur de carburant

Country Status (5)

Country Link
US (1) US6168095B1 (fr)
EP (1) EP0929742B1 (fr)
JP (1) JP2001504192A (fr)
DE (2) DE29713628U1 (fr)
WO (1) WO1999006692A1 (fr)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3630076B2 (ja) * 2000-05-30 2005-03-16 株式会社デンソー 弁装置
JP3908491B2 (ja) * 2001-08-03 2007-04-25 株式会社日立製作所 電子燃料噴射弁
DE10147205C1 (de) * 2001-09-25 2003-05-08 Bosch Gmbh Robert Verfahren zur Wärmebehandlung von Werkstücken aus temperaturbeständigen Stählen
JP2003120463A (ja) * 2001-10-16 2003-04-23 Hitachi Ltd 燃料噴射弁、ノズルボディ、流体通路を有する円筒部品の製造方法
DE10261175A1 (de) * 2002-12-20 2004-07-08 Daimlerchrysler Ag Schieberventil
EP1596059B1 (fr) * 2003-02-04 2013-11-06 Mitsubishi Denki Kabushiki Kaisha Soupape d'injection de carburant
DE102004039926B4 (de) * 2004-08-18 2016-09-22 Robert Bosch Gmbh Verfahren zur Herstellung eines temperatur- und korrosionsbeständigen Kraftstoffinjektorkörpers
US7185831B2 (en) * 2004-11-05 2007-03-06 Ford Motor Company Low pressure fuel injector nozzle
US7137577B2 (en) * 2004-11-05 2006-11-21 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
US7104475B2 (en) * 2004-11-05 2006-09-12 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7198207B2 (en) * 2004-11-05 2007-04-03 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
US7438241B2 (en) * 2004-11-05 2008-10-21 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7051957B1 (en) * 2004-11-05 2006-05-30 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
JP2006170192A (ja) 2004-11-17 2006-06-29 Denso Corp 燃料噴射ノズル及びその製造方法
US20070176025A1 (en) * 2006-01-31 2007-08-02 Joachim Gerster Corrosion resistant magnetic component for a fuel injection valve
US8029627B2 (en) * 2006-01-31 2011-10-04 Vacuumschmelze Gmbh & Co. Kg Corrosion resistant magnetic component for a fuel injection valve
FR2908838A1 (fr) 2006-11-20 2008-05-23 Peugeot Citroen Automobiles Sa Injecteur de carburant muni d'une aiguille creuse
JP4948295B2 (ja) * 2007-07-06 2012-06-06 愛三工業株式会社 燃料噴射弁
US9057115B2 (en) * 2007-07-27 2015-06-16 Vacuumschmelze Gmbh & Co. Kg Soft magnetic iron-cobalt-based alloy and process for manufacturing it
US20100025500A1 (en) 2008-07-31 2010-02-04 Caterpillar Inc. Materials for fuel injector components
AT511880B1 (de) * 2011-09-06 2013-12-15 Bosch Gmbh Robert Verschleissoptimierte herstellung von konischen spritzlöchern
DE102016222904A1 (de) * 2016-11-21 2018-05-24 Robert Bosch Gmbh Komponente, die zum Führen und/oder Speichern von zumindest einem Fluid und insbesondere für eine Brennstoffeinspritzanlage dient, Brennstoffeinspritzanlage und Verfahren zur Herstellung einer Komponente
CN109082608A (zh) * 2018-10-26 2018-12-25 成都先进金属材料产业技术研究院有限公司 控制低铬不锈钢中δ铁素体含量的方法
JP6888146B1 (ja) 2020-03-27 2021-06-16 日立Astemo株式会社 直噴式燃料噴射弁
WO2022077366A1 (fr) 2020-10-15 2022-04-21 Cummins Inc. Composants de système de carburant
CA3235020A1 (fr) * 2021-10-14 2023-04-20 Icom North America Llc Systeme d'injection de vortex air/carburant en ligne a haut debit pour moteurs a combustion interne

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2545520B2 (ja) * 1985-08-10 1996-10-23 ロ−ベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 内燃機関用の燃料噴射ノズル
DE4033706A1 (de) 1990-10-24 1991-02-21 Hans Prof Dr Ing Berns Einsatzhaerten mit stickstoff zur verbesserung des korrosionswiderstandes martensitischer nichtrostender staehle
JP2592542B2 (ja) * 1990-11-24 1997-03-19 株式会社日立製作所 電磁バルブのノズルの製造方法
JP3125162B2 (ja) * 1992-08-10 2001-01-15 株式会社日立製作所 燃料噴射装置のノズルボディ及び弁
JP2769422B2 (ja) * 1993-04-19 1998-06-25 日立金属株式会社 内燃機関の燃料噴射ノズルまたはニードル用高強度ステンレス鋼、内燃機関用燃料噴射ノズルおよびその製造方法
JP3559307B2 (ja) * 1993-05-11 2004-09-02 本田技研工業株式会社 燃料噴射弁の弁体または弁座
FR2713100B1 (fr) * 1993-11-30 1996-01-05 Rossignol Sa Ski.

Also Published As

Publication number Publication date
DE59807000D1 (de) 2003-02-27
WO1999006692A1 (fr) 1999-02-11
JP2001504192A (ja) 2001-03-27
US6168095B1 (en) 2001-01-02
EP0929742A1 (fr) 1999-07-21
DE29713628U1 (de) 1998-11-26

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