EP0188703A1 - Electromagnetically actuated fuel injector - Google Patents

Electromagnetically actuated fuel injector Download PDF

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Publication number
EP0188703A1
EP0188703A1 EP85115128A EP85115128A EP0188703A1 EP 0188703 A1 EP0188703 A1 EP 0188703A1 EP 85115128 A EP85115128 A EP 85115128A EP 85115128 A EP85115128 A EP 85115128A EP 0188703 A1 EP0188703 A1 EP 0188703A1
Authority
EP
European Patent Office
Prior art keywords
pin
valve
electromagnetically actuated
actuated fuel
fuel injection
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.)
Ceased
Application number
EP85115128A
Other languages
German (de)
French (fr)
Inventor
Eckhart Kern
Reiner Weingärtner
Gerhard Ruschek
Arnold Mann
Horst Schlick
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.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO AG
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 Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP0188703A1 publication Critical patent/EP0188703A1/en
Ceased 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
    • F02M61/06—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 being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0639—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature acting as a valve
    • 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

Definitions

  • the invention relates to an electromagnetically actuated fuel injection valve for injection systems of internal combustion engines, with a valve housing, a pin arranged as a metering element in a valve bore of the valve housing, a soft iron core arranged within the valve housing and carrying a fixed magnetic winding, and an opposing axis and forming an air gap Anchor, which is firmly connected to a closing member controlling the flow.
  • a valve housing with a pin arranged as a metering element in a valve bore of the valve housing, a soft iron core arranged within the valve housing and carrying a fixed magnetic winding, and an opposing axis and forming an air gap Anchor, which is firmly connected to a closing member controlling the flow.
  • the injection quantity must be dimensioned very precisely in internal combustion engines. This makes it necessary to test each fuel injector after assembly for its flow rate and, if necessary, to increase the flow rate by regrinding either the hardened pin or the valve bore. This work is time consuming and therefore costly.
  • the invention has for its object to provide a fuel injector according to the preamble with high flow accuracy, which can be manufactured in a simple and inexpensive manner.
  • This inventive design of the fuel injection valve eliminates the reworking at the metering point that was previously necessary. The correct flow rate is only set by simply changing the orifice.
  • Replacing the orifice plate is particularly simple if the orifice plate is arranged between a removable stop of the valve housing facing away from the injection side and a holding body holding the pin and inserted into the valve bore.
  • the diaphragm can simply be pulled forward out of the valve housing as soon as the stop, which can be formed by a pushed-on cap, is removed.
  • the pin is expediently cylindrical in the area of the orifice so that the flow rate of the fuel injection valve changes solely as a result of the change in the orifice diameter.
  • the invention permits numerous embodiments. One of them is shown schematically in the drawing and is described below.
  • the drawing shows in longitudinal section a portion of a valve housing 1 with a valve bore 2, in which a holding body 3 is pressed.
  • the holding body 3 forms a unit with a pin 4, which represents an atomizing and metering element for the fuel injector.
  • a panel 6 Between the holding body 3 and a front end wall 5, which is removable, there is a panel 6.
  • the end wall 5 forms a front stop 7 for the panel.
  • the valve bore 2 ends on the side facing away from the pin 4 with a valve seat 8, against which a plate valve 9 is held by means of a compression spring 10.
  • This plate valve 9 is able to move against the force of the compression spring 10 up to an armature 11 as soon as a magnetic coil, not shown, surrounding the armature 11 is energized.
  • the fuel to be sprayed then flows through the open valve seat 8, then through a passage 12 in the holding body 3 and then between the orifice 6 and pin 4 to the outside.
  • the pin 4 can of course also form a unit with the plate valve 9. It is only decisive for the invention that the pin 4 is surrounded by an exchangeable screen.

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  • 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)

Abstract

Bei einem Kraftstoffeinspritzventil ist in einer Ventilbohrung (2) ein Haltekörper (3) eingesetzt, der einen Zapfen (4) als Zerstäubungs- und Zumeßelement trägt. Eine auswechselbare Blende (6) ermöglicht es, durch Austausch dieser Blende (6) die genaue Durchflußmenge des Kraftstoffeinspritzventils einzustellen.In the case of a fuel injection valve, a holding body (3) is used in a valve bore (2) and carries a pin (4) as an atomizing and metering element. An exchangeable orifice (6) makes it possible to set the exact flow rate of the fuel injection valve by exchanging this orifice (6).

Description

Die Erfindung bezieht sich auf ein elektromagnetisch betätigbares Kraftstoffeinspritzventil für Einspritzanlagen von Brennkraftmaschinen, mit einem Ventilgehäuse, einem in einer Ventilbohrung des Ventilgehäuses angeordneten Zapfen als Zumeßelement, einem innerhalb des Ventilgehäuses angeordneten, eine feststehende Magnetwicklung tragenden Weicheisenkern und einem diesem gleichachsig und unter Bildung eines Luftspaltes gegenüberstehenden Anker, welcher fest mit einem den Durchfluß steuernden Schließglied verbunden ist. Solche Einspritzventile sind in heutigen Einspritzmotoren gebräuchlich und daher allgemein bekannt.The invention relates to an electromagnetically actuated fuel injection valve for injection systems of internal combustion engines, with a valve housing, a pin arranged as a metering element in a valve bore of the valve housing, a soft iron core arranged within the valve housing and carrying a fixed magnetic winding, and an opposing axis and forming an air gap Anchor, which is firmly connected to a closing member controlling the flow. Such injection valves are common in today's injection engines and are therefore generally known.

Die Einspritzmenge muß bei Brennkraftmaschinen sehr genau bemessen sein. Das macht es erforderlich, jedes Kraftstoffeinspritzventil nach der Montage hinsichtlich seiner Durchflußmenge zu testen und erforderlichenfalls die Durchflußmenge zu erhöhen, indem entweder der gehärtete Zapfen oder die Ventilbohrung nachgeschliffen werden. Diese Arbeiten sind zeitaufwendig und deshalb kostenintensiv.The injection quantity must be dimensioned very precisely in internal combustion engines. This makes it necessary to test each fuel injector after assembly for its flow rate and, if necessary, to increase the flow rate by regrinding either the hardened pin or the valve bore. This work is time consuming and therefore costly.

Der Erfindung liegt die Aufgabe zugrunde, ein Kraftstoffeinspritzventil nach dem Oberbegriff mit hoher Durchflußgenauigkeit zu schaffen, welches auf einfache und kostengünstige Weise herstellbar ist.The invention has for its object to provide a fuel injector according to the preamble with high flow accuracy, which can be manufactured in a simple and inexpensive manner.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Zapfen innerhalb einer auswechselbaren Blende sitzt.This object is achieved in that the pin sits within an interchangeable aperture.

Durch diese erfindungsgemäße Gestaltung des Kraftstoffeinspritzventils entfällt das bisher notwendige Nacharbeiten an der Zumeßstelle. Die richtige Durchflußmenge wird ausschließlich durch einen einfachen Austausch der Blende eingestellt.This inventive design of the fuel injection valve eliminates the reworking at the metering point that was previously necessary. The correct flow rate is only set by simply changing the orifice.

Besonders einfach ist das Austauschen der Blende, wenn die Blende zwischen einem von der Einspritzseite abgewandten, demontierbaren Anschlag des Ventilgehäuses und einem den Zapfen haltenden, in die Ventilbohrung eingesetzten Haltekörper angeordnet ist. Bei einer solchen Ausführungsform kann die Blende einfach nach vorn aus dem Ventilgehäuse herausgezogen werden, sobald der Anschlag, welcher von einer aufgeschobenen Kappe gebildet sein kann, demontiert ist.Replacing the orifice plate is particularly simple if the orifice plate is arranged between a removable stop of the valve housing facing away from the injection side and a holding body holding the pin and inserted into the valve bore. In such an embodiment, the diaphragm can simply be pulled forward out of the valve housing as soon as the stop, which can be formed by a pushed-on cap, is removed.

Zweckmäßigerweise ist der Zapfen im Bereich der Blende zylindrisch, damit ausschließlich durch die Veränderung des Blendendurchmessers sich die Durchflußmenge des Kraftstoffeinspritzventils verändert.The pin is expediently cylindrical in the area of the orifice so that the flow rate of the fuel injection valve changes solely as a result of the change in the orifice diameter.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Eine davon ist schematisch in der Zeichnung dargestellt und wird nachfolgend beschrieben.The invention permits numerous embodiments. One of them is shown schematically in the drawing and is described below.

Die Zeichnung zeigt im Längsschnitt einen Teilbereich eines Ventilgehäuses 1 mit einer Ventilbohrung 2, in der ein Haltekörper 3 eingepreßt ist. Der Haltekörper 3 bildet eine Einheit mit einem Zapfen 4, der ein Zerstäubungs- und Zumeßelement für das Kraftstoffeinspritzventil darstellt. Zwischen dem Haltekörper 3 und einer vorderen Abschlußwand 5, die demontierbar ist, befindet sich eine Blende 6. Die Abschlußwand 5 bildet einen vorderen Anschlag 7 für die Blende.The drawing shows in longitudinal section a portion of a valve housing 1 with a valve bore 2, in which a holding body 3 is pressed. The holding body 3 forms a unit with a pin 4, which represents an atomizing and metering element for the fuel injector. Between the holding body 3 and a front end wall 5, which is removable, there is a panel 6. The end wall 5 forms a front stop 7 for the panel.

Die Ventilbohrung 2 endet an der dem.Zapfen 4 abgewandten Seite mit einem Ventilsitz 8, gegen den ein Plattenventil 9 mittels einer Druckfeder 10 gehalten ist. Dieses Plattenventil 9 vermag sich gegen die Kraft der Druckfeder 10 bis gegen einen Anker 11 zu verschieben, sobald eine nicht dargestellte, den Anker 11 umgebende Magnetspule bestromt wird. Der zu verspritzende Kraftstoff strömt dann durch den geöffneten Ventilsitz 8, anschließend durch einen Durchlaß 12 im Haltekörper 3 und danach zwischen Blende 6 und Zapfen 4 nach außen.The valve bore 2 ends on the side facing away from the pin 4 with a valve seat 8, against which a plate valve 9 is held by means of a compression spring 10. This plate valve 9 is able to move against the force of the compression spring 10 up to an armature 11 as soon as a magnetic coil, not shown, surrounding the armature 11 is energized. The fuel to be sprayed then flows through the open valve seat 8, then through a passage 12 in the holding body 3 and then between the orifice 6 and pin 4 to the outside.

Der Zapfen 4 kann natürlich auch mit dem Plattenventil 9 eine Einheit bilden. Entscheidend für die Erfindung ist nur, daß der Zapfen 4 von einer austauschbaren Blende umgeben ist.The pin 4 can of course also form a unit with the plate valve 9. It is only decisive for the invention that the pin 4 is surrounded by an exchangeable screen.

Claims (3)

1. Elektromagnetisch betätigbares Kraftstoffeinspritzventil für Einspritzanlagen von Brennkraftmaschinen, mit einem Ventilgehäuse, einem in einer Ventilbohrung angeordneten Zapfen als Zumeßelement, einem innerhalb des Ventilgehäuses angeordneten, eine feststehende Magnetwicklung tragenden Weicheisenkern und einem diesem gleichachsig und unter Bildung eines Luftspaltes gegenüberstehenden Anker, welcher fest mit einem den Durchfluß steuernden Schließglied verbunden ist, dadurch qekennzeichnet, daß der Zapfen (4) innerhalb einer auswechselbaren Blende (6) sitzt.1. Electromagnetically actuated fuel injection valve for injection systems of internal combustion engines, with a valve housing, a pin arranged as a metering element in a valve bore, a soft iron core arranged within the valve housing and carrying a fixed magnetic winding, and an armature that is coaxial with it and forms an air gap, which is fixed to an armature the flow-controlling closing member is connected, characterized in that the pin (4) sits within an interchangeable diaphragm (6). 2. Elektromagnetisch betätigbares Kraftstoffeinspritzventil nach Anspruch 1, dadurch qekennzeichnet, daß die Blende (6) zwischen einem der Einspritzseite abgewandten, demontierbaren Anschlag (7) des Ventilgehäuses (1) und einem den Zapfen (4) haltenden Haltekörper (3) in der Ventilbohrung (2) angeordnet ist.2. Electromagnetically actuated fuel injection valve according to claim 1, characterized in that the orifice (6) between a detachable stop facing away from the injection side (7) of the valve housing (1) and a holding body (3) holding the pin (4) in the valve bore ( 2) is arranged. 3. Elektromagnetisch betätigbares Kraftstoffeinspritzventil nach Anspruch 1 oder 2, dadurch qekennzeichnet, daß der Zapfen (4) im Bereich der Blende (6) zylindrisch ist.3. Electromagnetically actuated fuel injection valve according to claim 1 or 2, characterized in that the pin (4) in the region of the diaphragm (6) is cylindrical.
EP85115128A 1985-01-23 1985-11-28 Electromagnetically actuated fuel injector Ceased EP0188703A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853502086 DE3502086A1 (en) 1985-01-23 1985-01-23 ELECTROMAGNETICALLY ACTUABLE FUEL INJECTION VALVE
DE3502086 1985-01-23

Publications (1)

Publication Number Publication Date
EP0188703A1 true EP0188703A1 (en) 1986-07-30

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ID=6260506

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115128A Ceased EP0188703A1 (en) 1985-01-23 1985-11-28 Electromagnetically actuated fuel injector

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US (1) US4688723A (en)
EP (1) EP0188703A1 (en)
DE (1) DE3502086A1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539056A1 (en) * 1985-11-04 1987-05-14 Vdo Schindling ELECTROMAGNETICALLY ACTUABLE FUEL INJECTION VALVE
US5156342A (en) * 1986-10-24 1992-10-20 Nippondenso Co. Ltd. Electromagnetic fuel injection valve for internal combustion engine
US5161743A (en) * 1986-10-24 1992-11-10 Nippondenso Co., Ltd. Electromagnetic fuel injection valve for internal combustion engine
US5080287A (en) * 1986-10-24 1992-01-14 Nippondenso Co., Ltd. Electromagnetic fuel injection valve for internal combustion engine
US5241935A (en) * 1988-02-03 1993-09-07 Servojet Electronic Systems, Ltd. Accumulator fuel injection system
IT1250845B (en) * 1991-10-11 1995-04-21 Weber Srl ELECTROMAGNETICALLY OPERATED FUEL DOSING AND PULVERIZING VALVE FOR AN ENDOTHERMAL MOTOR FEEDING DEVICE
US6328231B1 (en) 1998-05-27 2001-12-11 Siemens Automotive Corporation Compressed natural gas injector having improved low noise valve needle
US6508418B1 (en) 1998-05-27 2003-01-21 Siemens Automotive Corporation Contaminant tolerant compressed natural gas injector and method of directing gaseous fuel therethrough
US6334580B2 (en) * 1999-05-26 2002-01-01 Siemens Automotive Corporation Gaseous injector with columnated jet oriface flow directing device
US6431474B2 (en) 1999-05-26 2002-08-13 Siemens Automotive Corporation Compressed natural gas fuel injector having magnetic pole face flux director
US6422488B1 (en) 1999-08-10 2002-07-23 Siemens Automotive Corporation Compressed natural gas injector having gaseous dampening for armature needle assembly during closing
US6405947B2 (en) 1999-08-10 2002-06-18 Siemens Automotive Corporation Gaseous fuel injector having low restriction seat for valve needle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE894789C (en) * 1949-12-11 1953-10-29 Daimler Benz Ag Fluid controlled injection nozzle with conical pin for internal combustion engines
FR2241008A1 (en) * 1973-08-17 1975-03-14 Tech Haute Precision Electro-magnetic petrol injector with rapid action - has accurately controlled annular fuel passage
DE2710003A1 (en) * 1977-03-08 1978-09-14 Bosch Gmbh Robert IC engine fuel injector nozzle - has fuel opening located in auxiliary plate screwed to nozzle
DE3308430A1 (en) * 1982-03-15 1983-09-15 Aisan Kogyo K.K., Obu, Aichi Solenoid fuel injection

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619378A (en) * 1947-09-04 1952-11-25 Watkins Samuel Scott Spray nozzle
US2860780A (en) * 1954-12-06 1958-11-18 Kloeckner Humboldt Deutz Ag Fuel injection valve
AU8211375A (en) * 1974-06-29 1976-12-16 Lucas Electrical Co Ltd Fuel injection nozzle
DE2900176A1 (en) * 1979-01-04 1980-07-24 Bosch Gmbh Robert INJECTION VALVE FOR FUEL INJECTION SYSTEMS
DE3023757A1 (en) * 1980-06-25 1982-01-21 Robert Bosch Gmbh, 7000 Stuttgart INJECTION VALVE
US4452396A (en) * 1982-05-26 1984-06-05 General Motors Corporation Fuel injector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE894789C (en) * 1949-12-11 1953-10-29 Daimler Benz Ag Fluid controlled injection nozzle with conical pin for internal combustion engines
FR2241008A1 (en) * 1973-08-17 1975-03-14 Tech Haute Precision Electro-magnetic petrol injector with rapid action - has accurately controlled annular fuel passage
DE2710003A1 (en) * 1977-03-08 1978-09-14 Bosch Gmbh Robert IC engine fuel injector nozzle - has fuel opening located in auxiliary plate screwed to nozzle
DE3308430A1 (en) * 1982-03-15 1983-09-15 Aisan Kogyo K.K., Obu, Aichi Solenoid fuel injection

Also Published As

Publication number Publication date
US4688723A (en) 1987-08-25
DE3502086A1 (en) 1986-07-24

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Inventor name: MANN, ARNOLD

Inventor name: WEINGAERTNER, REINER

Inventor name: RUSCHEK, GERHARD