EP0366833B1 - Injektor mit elektromagnetischer Steuerung - Google Patents

Injektor mit elektromagnetischer Steuerung Download PDF

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Publication number
EP0366833B1
EP0366833B1 EP88118457A EP88118457A EP0366833B1 EP 0366833 B1 EP0366833 B1 EP 0366833B1 EP 88118457 A EP88118457 A EP 88118457A EP 88118457 A EP88118457 A EP 88118457A EP 0366833 B1 EP0366833 B1 EP 0366833B1
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EP
European Patent Office
Prior art keywords
injector
chamber
axis
injection
sealing ring
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
EP88118457A
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English (en)
French (fr)
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EP0366833A1 (de
Inventor
Mauro Forapianti
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.)
Siemens AG
Original Assignee
Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE88118457T priority Critical patent/DE3870240D1/de
Priority to EP88118457A priority patent/EP0366833B1/de
Publication of EP0366833A1 publication Critical patent/EP0366833A1/de
Application granted granted Critical
Publication of EP0366833B1 publication Critical patent/EP0366833B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F02M61/1853—Orifice plates
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0667—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature acting as a valve or having a short valve body attached thereto
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • 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

  • This invention relates to an electromagnetically operated injector for use in electronically controlled fuel injection systems, of the single or multiple injector type, for internal combustion engines.
  • This type of injector characteristically comprises a casing, a fuel inlet in said casing, fuel discharge elements complete with at least partly magnetic valve means for controlling the fuel flow through said discharge elements, and a solenoid contained in said casing and which, when energized, causes said valve means to open in opposition to elastic means, and thus allowing the fuel to flow through said discharge elements.
  • One of the main characteristics to be considered in designing this type of electromagnetic injector is the shape of the jet coming out of the injection nozzle.
  • an atomized conical spray can be desirable to facilitate the mixing of the gasoline with the air drawn in by the engine.
  • the object of the present invention is therefore to obtain, in a simple manner and under low production costs, an electromagnetic injector which creates an atomized conical jet and which obviates the drawbacks of the known art.
  • an electromagnetic conical jet injector which:
  • an injector according to the present invention has the following advantages:
  • Figure 1 is a longitudinal section through an electromagnetic injector constructed in accordance with the principles of the present invention.
  • Figure 2 is a view, to an enlarged scale, of the valving part of the injector seen in Figure 1.
  • FIGS 3 and 4 show some modifications of the outlet orifices which can be applied to the injector of Figure 1.
  • an electromagnetic fuel injector in accordance with this invention, includes an external body 1 formed from magnetizable material which houses an electric coil 2, wound on a spool 3, which surrounds a cylindrical magnetic core 4, also formed from magnetizable material.
  • a bushing 5 is mounted, made of non-magnetizable material, which acts as the longitudinal guide to a cup-shaped mobile armature 6 which, together with the body 1 and the core 4, forms the magnetic circuit.
  • the mobile armature 6 carries a plastic-made seating insert 7 which cooperates with the upper surface of the nozzle body 8 so to create the shut-off system for the fuel flowing through an axial bore 9 and cross-holes 10 in the central core 4.
  • the valving system is kept closed by the force on the armature of a spring 11 housed in the central core 4 and reacting on a dowel 12.
  • the injector includes furthermore a series of O-rings, a spacer 16, which adjusts the lift to the armature 6, and an inlet filter 17.
  • FIG. 2 describes in more details the area of the injector which is subject to this invention.
  • the plastic insert 7 is firmly assembled through the roll-over of the armature's rim; on the external face of such plastic insert 7 an external flat surface 18 is present which works together with an opposed planar annular ring 19, concentrically created on the upper surface of the injection nozzle 8 which has the shape of a bottom-up cup.
  • the two surfaces 18 and 19 create the valving system which allows or closes the fuel flow towards the orifice of the nozzle.
  • the total area of said one or more injection orifices 21 defines, together with their flow coeeficient, the quantitiy of fuel delivered by the injector.
  • a second chamber 22 can be found on the bottom side of the nozzle body 8, concentric to the injector's axis, opposed to chamber 20 but having largely bigger dimensions, the one or more injection orifices 21 terminating in such chamber.
  • the axis of said injection orifices are coplanar with the injector's axis and they can be parallel with it or such to create with it an angle which can range between 0.5 and 15 degrees.
  • the direction of the one or more orifices axis will be such to avoid any collision among themselves or with an inner wall 23 of the second chamber 22.
  • Figure 3 shows, as an axample, a different embodiment of the injector subject to this invention, where two injection orifices are coplanar and parallel with the injector's axis.
  • Figure 4 shows, an embodiment where only one orifice is present and its axis converges with the coplanar injector's axis.
  • the reduced depth of chamber 20 and the position of the one or more orifices on the periphery of such chamber are such that the fuel flow must deviate with a sharp turn in order to be addressed to the above one or more orifices 21 which have a direction basically parallel to the injector's axis.
  • the spray pattern which is obtained in this invention shows quite an even distribution in the inside of the cone thanks to the lack of any mechanical element near the injection orifices.
  • the reduced dimensions of the inner chamber 20 are such that, even when only one injection orifice 21 is used, positioned against the cylindrical wall of said chamber, its actual distance from the injector axis is negligible as far as the exact position of the jet in the intake manifold is concerned.
  • the injector can, therefore, be considered "a central discharge type".

Landscapes

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

Claims (5)

  1. Elektromagnetisch betätigte Einspritzvorrichtung zum Abgeben von Kraftstoff an eine Brennkraftmaschine, wobei die Einspritzvorrichtung aufweist:
    - einen Düsenkörper (8) mit einem Dichtring (19), der konzentrisch zu der Achse der Einspritzvorrichtung und auf der Innenseite der Einspritzvorrichtung angeordnet ist;
    - eine erste innere zylindrische Kammer (20), die von dem Dichtring (19) umgeben und stromab einer ringförmigen Dichtfläche an der Oberseite des Dichtringes (19) angeordnet ist;
    - mindestens eine Einspritzöffnung (21), die im Boden der ersten inneren zylindrischen Kammer (20) gebildet und näher zu den Seitenwänden als zur Mitte der ersten Kammer (20) hin angeordnet ist;
    - eine zweite zylindrische Kammer (22), die stromab der ersten Kammer (20) angeordnet ist, wobei die Einspritzöffnung (21) in diese zweite Kammer (22) mündet;
    - einen magnetischen Anker (6), der entlang der Achse der Einspritzvorrichtung bewegbar ist, wobei der Anker eine Dichtfläche (18) besitzt, die durch die Kraft eines elastischen Mittels gegen den Dichtring (19) angedrückt wird und durch eine elektromagnetische Kraft von dem Dichtring (19) abgehoben werden kann;
    - wobei die Achse der Einspritzöffnung (21) koplanar zu der Achse der Einspritzvorrichtung und so gerichtet ist, daß eine Kollision des Kraftstoffstromes mit der zylindrischen Fläche der zweiten Kammer (22) vermieden wird,
    dadurch gekennzeichnet, daß
    - der maximale Arbeitsabstand zwischen dem Dichtring (19) des Düsenkörpers (8) und der Dichtfläche (18) des magnetischen Ankters (6) kleiner als 50 % des Durchmessers des oder der Einspritzöffnungen (21) und kleiner als 10 % des Durchmessers der ersten inneren Kammer (20) ist, und
    - die Achse der Einspritzöffnungen so gerichtet ist, daß eine Kollision der Kraftstoffströme untereinander vermieden wird, wenn mehr als eine Einspritzöffnung vorgesehen ist.
  2. Elektromagnetisch betätigte Einspritzvor-richtung nach Anspruch 1, dadurch gekennzeichnet, daß eine Tiefe (h) der ersten inneren Kammer (20), ein Durchmesser (d) der Einspritzöffnungen und eine Anzahl (n) der Einspritzöffnungen die folgende Beziehung zueinander haben:

    0,75 ≦ n d/h ≦ 5.
    Figure imgb0005
  3. Elektromagnetisch betätigte Einspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Einspritzöffnung oder bzw. die Einspritzöffnungen (21), die koplanar zu der Achse der Einspritzvorrichtung sind, außerdem parallel zu dieser Achse sind.
  4. Elektromagnetisch betätigte Einspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Einspritzöffnung oder bzw. die Einspritzöffnungen (21), die kopla nar zu der Achse der Einspritzvorrichtung sind, mit dieser einen Winkel von 0,5 bis 15° einschließen.
  5. Elektromagnetisch betätigte Einspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die erste innere Kammer (20), die an dem Düsenkörper angeordnet ist, ein Volumen von 0,5 bis 1 mm³ besitzt.
EP88118457A 1988-11-04 1988-11-04 Injektor mit elektromagnetischer Steuerung Expired - Lifetime EP0366833B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE88118457T DE3870240D1 (en) 1988-11-04 1988-11-04 Electromagnetically-operated fuel injector for IC engine
EP88118457A EP0366833B1 (de) 1988-11-04 1988-11-04 Injektor mit elektromagnetischer Steuerung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88118457A EP0366833B1 (de) 1988-11-04 1988-11-04 Injektor mit elektromagnetischer Steuerung

Publications (2)

Publication Number Publication Date
EP0366833A1 EP0366833A1 (de) 1990-05-09
EP0366833B1 true EP0366833B1 (de) 1992-04-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118457A Expired - Lifetime EP0366833B1 (de) 1988-11-04 1988-11-04 Injektor mit elektromagnetischer Steuerung

Country Status (2)

Country Link
EP (1) EP0366833B1 (de)
DE (1) DE3870240D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994000686A1 (de) * 1992-06-27 1994-01-06 Robert Bosch Gmbh Spritzlochscheibe fur ein ventil und verfahren zur herstellung
EP0987479A3 (de) * 1998-09-14 2001-05-02 Toyota Jidosha Kabushiki Kaisha Kraftstoffeinspritzventil und Verfahren zu dessen Herstellung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102252124B (zh) * 2010-05-21 2013-07-24 北京亚新科天纬油泵油嘴股份有限公司 一种应用于共轨喷油器的电磁阀
US10047713B2 (en) * 2013-11-11 2018-08-14 Enplas Corporation Attachment structure of fuel injection device nozzle plate
DE102017220798A1 (de) * 2017-11-21 2019-05-23 Robert Bosch Gmbh Dosierventil und Strahlpumpeneinheit zum Steuern eines gasförmigen Mediums

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382151A (en) * 1940-12-11 1945-08-14 Jr William Harper Fuel injector
US4101074A (en) * 1976-06-17 1978-07-18 The Bendix Corporation Fuel inlet assembly for a fuel injection valve
IT1085959B (it) * 1977-08-04 1985-05-28 Alfa Romeo Spa Iniettore di benzina per motori a scoppio
GB8327527D0 (en) * 1983-10-14 1983-11-16 Lucas Ind Plc Fuel injector
US4699323A (en) * 1986-04-24 1987-10-13 General Motors Corporation Dual spray cone electromagnetic fuel injector
GB8611950D0 (en) * 1986-05-16 1986-06-25 Lucas Ind Plc Gasoline injector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994000686A1 (de) * 1992-06-27 1994-01-06 Robert Bosch Gmbh Spritzlochscheibe fur ein ventil und verfahren zur herstellung
EP0987479A3 (de) * 1998-09-14 2001-05-02 Toyota Jidosha Kabushiki Kaisha Kraftstoffeinspritzventil und Verfahren zu dessen Herstellung

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Publication number Publication date
EP0366833A1 (de) 1990-05-09
DE3870240D1 (en) 1992-05-21

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