EP0312708A1 - Electromagnetic injection valve for internal combustion engines and method for its production - Google Patents

Electromagnetic injection valve for internal combustion engines and method for its production Download PDF

Info

Publication number
EP0312708A1
EP0312708A1 EP88111303A EP88111303A EP0312708A1 EP 0312708 A1 EP0312708 A1 EP 0312708A1 EP 88111303 A EP88111303 A EP 88111303A EP 88111303 A EP88111303 A EP 88111303A EP 0312708 A1 EP0312708 A1 EP 0312708A1
Authority
EP
European Patent Office
Prior art keywords
valve
round rod
injection valve
injection
longitudinal direction
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
EP88111303A
Other languages
German (de)
French (fr)
Other versions
EP0312708B1 (en
Inventor
Walter Schauer
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.)
Pierburg GmbH
Original Assignee
Pierburg 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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP0312708A1 publication Critical patent/EP0312708A1/en
Application granted granted Critical
Publication of EP0312708B1 publication Critical patent/EP0312708B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • 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
    • F02M61/161—Means for adjusting injection-valve lift
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • the invention relates to an electromagnetic injection valve for internal combustion engines according to the preamble of claim 1 and 3 respectively.
  • an element is axially displaced within a tube arranged centrally in the valve, whereby the preload of the spring loading the valve closing body is to be adjusted.
  • the named element is secured in different ways. If the tube is at the same time the magnetic core, at the free end of which the magnet armature strikes, there is a risk that the armature will tilt after a long period of operation if it has worked something into the tube due to asymmetrical impact. The valve then no longer measures precisely and is no longer leakproof.
  • a stop bush can be positively connected to the valve needle by squeezing material into punctures located on the circumference of the valve needle.
  • the material of the stop bushing may tend to spring back in the crimping area, there are problems with the durability of this connection.
  • the object of the invention is to design an injection valve of the type mentioned in such a way that the setting processes of spring force and stroke which are decisive for the function of the valve can be carried out simply and precisely and can be permanently secured.
  • the advantage achieved by the invention is in particular that very simple adjustment methods of the highest accuracy can be achieved at low cost by a length change formed by deformation for stroke adjustment with subsequent spring force adjustment via a clamping ring.
  • a valve upper part 1 is made of magnetizable soft iron as an extruded part or the like and in connection with a round rod 2 made of magnetizable material with the function of an adjusting pin and a valve housing 3.
  • An electrical coil 4 is inserted in the annular space remaining between round rod 2 and valve housing 3. which is excitable via leads, not shown.
  • the fuel flows from a supply line 5 around the coil to the fuel return 6 and in this way cools the coil.
  • the fuel is applied to a valve seat 8 in accordance with its delivery pressure in the region of a valve seat body 7 fastened to the valve housing 3.
  • On the round rod 2 there is a clamping ring 9 (shown in FIG.
  • the stroke of the valve closing body 11 acting as an armature is located between the end face of the round rod 2 and the spherical end face of the valve closing body 11, which can be designed as a round rod, but also as a plate, ball or hemisphere.
  • the preassembled fuel injector is adjusted in several steps:
  • the centrally arranged round rod 2 is, when the coil is energized (tightened valve closing member 11), by a tool around a specified setpoint, e.g. approx. 0.03 - 0.08 mm, axially displaced in the direction of the valve seat 8 and in this position with the neck 12 of the valve upper part 1 by e.g. Laser welding connected.
  • the coarse adjustment can also be achieved by pressing, if the affected parts are designed accordingly, whereby laser welding is not required. It is also conceivable to specify a flow value as a reference variable for the axial displacement.
  • the length of the rod 2 is changed by means of an embossing device 15 by the radial force acting on it.
  • the embossing process is carried out depending on the flow of a test medium under pressure (air, fuel or other medium) and taking into account the springback of the deformed material. It is important that the embossing is carried out at a constant speed and that after the setpoint has been reached, the embossing dies are immediately pulled out of the embossing marks 16 in order to avoid further flow of the material and thus a further undesired change in length.
  • the embossing stamps are advantageously cylindrical in a certain diameter and with a small lifting bevel in order to achieve a desired constant, finely metered change in length in this case in a ratio of approx. 10: 1. on the other hand, to avoid jamming when the dies are withdrawn from the deformed material.
  • a stroke adjustment method an adjustment accuracy of ⁇ 0.001 mm can be achieved.
  • the spring force of the spring 10 is adjusted during dynamic operation of the valve, i.e. This is clocked with a fixed frequency and opening time, with fuel under operating pressure.
  • the clamping ring 9 arranged on the round rod 2 is axially displaced by means of a tool 17.
  • the tool 17 is equipped with two punches which engage through two opposing return bores 6 in the valve upper part 1 in recesses 18, 19 of the clamping ring 9, the one punch first pushing the clamping ring 9 apart and thus releasing the clamping connection. Both stamps raise or lower the loosened clamping ring 9, whereby the spring 10 is more or less tensioned.
  • the position in which the defined fuel throughput is measured is fixed by tensioning the clamping ring 9 on the round rod 2, supported by both arms of the device 17.
  • One arm of the device 17 moves out of the recess 18 of the clamping ring 9 until the clamping connection between the clamping ring 9 and the round rod 2 is restored.
  • a further advantage is that the change in the stroke due to springing back of the material deformed transversely to the longitudinal direction can only occur in a ratio of approximately 1:10 in the event of aging. An associated change in throughput remains within narrow tolerances.

Abstract

Known electromagnetic injection valves have the disadvantage that, following operations to set the valve lift and the valve closing spring force, problems of service life occur, the valves no longer accurately metering the required injection quantities or else no longer being tight. With the new injection valve this disadvantage is avoided. The new injection valve is characterised in that following a rough preadjustment by displacement of a circular rod (2) a fine adjustment of the valve lift is achieved by a longitudinal variation of the circular rod (2) by deforming this with the aid of hobs (15). The closing spring force adjustment is carried out by axial displacement of a tension ring (9) arranged on the circular rod (2). Injection valves of this type have applications in fuel injection systems for the fuel supply of internal combustion engines. <IMAGE>

Description

Die Erfindung betrifft ein elektromagnetisches Einspritzventil für Brennkraftmaschinen nach dem Oberbegriff des Patentanspruchs 1 bzw. 3.3. The invention relates to an electromagnetic injection valve for internal combustion engines according to the preamble of claim 1 and 3 respectively.

Derartige Einspritzventile sind bekannt. Hierbei tritt das Problem auf, daß zur Durchflußmengenbestimmung die Notwendigkeit besteht, eine Ab­stimmung zwischen der den Ventilkörper belastenden Federkraft und der Magnetöffnungskraft herzustellen, so daß gewährleistet ist, daß das Ventil bei abgeschaltetem Erregerstrom sicher auf dem Ventilsitz auf­liegt und diesen abdichtet und andererseits die in Öffnungsrichtung wirkende Magnetkraft hohe Schaltfrequenzen ermöglicht, ohne daß dies durch die Federkraft beeinträchtigt wird. Ferner ist es erforderlich, daß zum gleichen Zweck der Durchflußmengenbestimmung der Hub des Ven­tilkörpers genau justiert wird. Für die Justierung ist es bekannt, daß der den Ventilsitz tragende Düsenkopf aus Blech ausgebildet ist und in der Einstelloperation solange deformiert wird, bis das geforderte Maß des Hubes erreicht ist. Ferner ist es bekannt, daß innerhalb eines zen­trisch im Ventil angeordneten Rohres ein Element axial verschoben wird, womit die Vorspannung der den Ventilschließkörper belastenden Feder ein­gestellt werden soll. Das genannte Element wird auf verschiedene Weise gesichert. Sofern das Rohr gleichzeitig der Magnetkern ist, an dessen freies Ende der Magnetanker anschlägt, so besteht die Gefahr, daß sich der Anker nach längerer Betriebszeit verkantet, wenn er sich durch asymmetrisches Aufschlagen etwas in das Rohr eingearbeitet hat. Das Ventil mißt dann nicht mehr präzise zu und ist auch nicht mehr dicht.Such injection valves are known. The problem arises here that for the determination of the flow rate there is a need to establish a balance between the spring force loading the valve body and the magnetic opening force, so that it is ensured that the valve rests securely on the valve seat and seals it when the excitation current is switched off, and on the other hand seals it in the opening direction acting magnetic force enables high switching frequencies without being affected by the spring force. It is also necessary that the stroke of the valve body is precisely adjusted for the same purpose of determining the flow rate. For the adjustment it is known that the nozzle head carrying the valve seat is made of sheet metal and is deformed in the adjustment operation until the required degree of stroke is reached. Furthermore, it is known that an element is axially displaced within a tube arranged centrally in the valve, whereby the preload of the spring loading the valve closing body is to be adjusted. The named element is secured in different ways. If the tube is at the same time the magnetic core, at the free end of which the magnet armature strikes, there is a risk that the armature will tilt after a long period of operation if it has worked something into the tube due to asymmetrical impact. The valve then no longer measures precisely and is no longer leakproof.

Aus der DE-OS 34 31 677 bereits bekannt, daß eine Anschlagbuchse durch Verquetschen von Material in Einstiche, die sich am Umfang der Ventil­nadel befinden, mit dieser formschlüssig zu verbinden. Da jedoch das Material der Anschlagbuchse im Quetschbereich zu Rückfederung neigen kann, bestehen hinsichtlich der Dauerhaltbarkeit dieser Verbindung Pro­bleme.From DE-OS 34 31 677 it is already known that a stop bush can be positively connected to the valve needle by squeezing material into punctures located on the circumference of the valve needle. However, since the material of the stop bushing may tend to spring back in the crimping area, there are problems with the durability of this connection.

Aufgabe der Erfindung ist es, ein Einspritzventil eingangs genannter Art derart auszubilden, daß die für die Funktion des Ventils maßgeb­lichen Einstellvorgänge von Federkraft und Hub einfach und präzise durchgeführt und dauerhaft gesichert werden können.The object of the invention is to design an injection valve of the type mentioned in such a way that the setting processes of spring force and stroke which are decisive for the function of the valve can be carried out simply and precisely and can be permanently secured.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 bzw. 3 gelöst. Vorteilhafte Weiterbildungen sind mit den Unteransprüchen genannt.This object is solved by the features of claims 1 and 3, respectively. Advantageous further developments are mentioned in the subclaims.

Der mit der Erfindung erzielte Vorteil besteht insbesondere darin, daß durch eine durch Verformung gebildete Längenänderung zur Hubeinstellung mit nachfolgender Federkrafteinstellung über einen Spannring sehr einfache Einstellmethoden höchster Genauigkeit bei geringen Kosten erreicht werden.The advantage achieved by the invention is in particular that very simple adjustment methods of the highest accuracy can be achieved at low cost by a length change formed by deformation for stroke adjustment with subsequent spring force adjustment via a clamping ring.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung schematisch dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown schematically in the drawing and is described in more detail below.

Es zeigt:

  • Fig. 1 einen Schnitt durch ein Einspritzventil,
  • Fig. 2 eine Draufsicht auf einen Spannring.
It shows:
  • 1 shows a section through an injection valve,
  • Fig. 2 is a plan view of a clamping ring.

Ein Ventiloberteil 1 ist aus magnetisierbarem Weicheisen als Fließpreß­teil oder dergleichen hergestellt und in Verbindung mit einem aus mag­netisierbarem Werkstoff bestehenden Rundstab 2 mit der Funktion eines Justierstiftes und einem Ventilgehäuse 3. In dem zwischen Rundstab 2 und Ventilgehäuse 3 verbleibenden Ringraum ist eine elektrische Spule 4 eingesetzt, die über nicht dargestellte Zuleitungen erregbar ist. Der Brennstoff fließt von einer Zuleitung 5 um die Spule herum zum Brenn­stoffrücklauf 6 und kühlt auf diese Weise die Spule. Gleichtzeitig steht der Brennstoff entsprechend seinem Förderdruck im Bereich eines am Ven­tilgehäuse 3 befestigten Ventilsitzkörpers 7 an einem Ventilsitz 8 an. Auf dem Rundstab 2 befindet sich ein Spannring 9 (in Fig. 2 dargestellt), der mit einer Feder 10 zusammenwirkt, die einen Ventilschließkörper 11 in Richtung des Ventilsitzes 8 belastet. Im vorliegenden Ausführungsbei­spiel befindet sich der Hub des als Anker wirkenden Ventilschließkörpers 11 zwischen der Stirnfläche des Rundstabes 2 und der balligen Stirnfläche des Ventilschließkörpers 11, der als Rundstab, jedoch auch als Platte, Kugel oder Halbkugel ausgebildet sein kann.A valve upper part 1 is made of magnetizable soft iron as an extruded part or the like and in connection with a round rod 2 made of magnetizable material with the function of an adjusting pin and a valve housing 3. An electrical coil 4 is inserted in the annular space remaining between round rod 2 and valve housing 3. which is excitable via leads, not shown. The fuel flows from a supply line 5 around the coil to the fuel return 6 and in this way cools the coil. At the same time, the fuel is applied to a valve seat 8 in accordance with its delivery pressure in the region of a valve seat body 7 fastened to the valve housing 3. On the round rod 2 there is a clamping ring 9 (shown in FIG. 2) which cooperates with a spring 10 which loads a valve closing body 11 in the direction of the valve seat 8. In the present exemplary embodiment, the stroke of the valve closing body 11 acting as an armature is located between the end face of the round rod 2 and the spherical end face of the valve closing body 11, which can be designed as a round rod, but also as a plate, ball or hemisphere.

Bevor zur Vervollständigung des Ventils die dazu benötigten Bauteile (in der Zeichnung nicht dargestellt) montiert werden, erfolgen nach­stehend beschriebene Einstellvorgänge.Before the components required for completing the valve (not shown in the drawing) are installed, the setting procedures described below are carried out.

Das vormontierte Einspritzventil wird in seinem Ventilhub in mehreren Schritten justiert:The preassembled fuel injector is adjusted in several steps:

a) Grobeinstellunga) Coarse adjustment

Der zentrisch angeordnete Rundstab 2 (Justierstift) wird bei erregter Spule (angezogenes Ventilschließglied 11) durch ein Werkzeug um einen festgelegten Sollwert, z.B. ca. 0,03 - 0,08 mm, axial in Richtung Ventilsitz 8 verschoben und in dieser Stellung mit dem Hals 12 des Ventiloberteils 1 durch z.B. Laserschweißung verbunden. Die Grob­einstellung kann auch, bei entsprechender Auslegung der betroffenen Teile, durch Pressen erreicht werden, wodurch das Laserschweißen ent­fällt. Ebenso ist es denkbar als Führungsgröße der axialen Verschie­bung einen Durchflußwert vorzugeben.The centrally arranged round rod 2 (adjusting pin) is, when the coil is energized (tightened valve closing member 11), by a tool around a specified setpoint, e.g. approx. 0.03 - 0.08 mm, axially displaced in the direction of the valve seat 8 and in this position with the neck 12 of the valve upper part 1 by e.g. Laser welding connected. The coarse adjustment can also be achieved by pressing, if the affected parts are designed accordingly, whereby laser welding is not required. It is also conceivable to specify a flow value as a reference variable for the axial displacement.

b) Feineinstellungb) Fine adjustment

Durch zwei sich im Hals 12 des Ventiloberteils 1 gegenüberliegende Bohrungen 13,14 erfolgt mit Hilfe einer Prägevorrichtung 15 durch radiale Krafteinwirkung auf den Rundstab 2 eine Längenänderung des­selben. Der Prägungsvorgang wird in Abhängigkeit des Durchflußes eines unter Betriebsdruck stehenden Prüfmediums (Luft, Kraftstoff oder anderes Medium) und unter Berücksichtigung der Rückfederung des verformten Materials durchgeführt. Dabei ist es wichtig, daß die Prägung mit einer konstanten Geschwindigkeit ausgeführt wird und nach Erreichen des Sollwertes die Prägestempel sofort aus den Prägemarken 16 gezogen werden, um ein weiteres Fließen des Materials und damit eine weitere ungewünschte Längenänderung zu vermeiden.Through two bores 13, 14 in the neck 12 of the upper valve part 1, the length of the rod 2 is changed by means of an embossing device 15 by the radial force acting on it. The embossing process is carried out depending on the flow of a test medium under pressure (air, fuel or other medium) and taking into account the springback of the deformed material. It is important that the embossing is carried out at a constant speed and that after the setpoint has been reached, the embossing dies are immediately pulled out of the embossing marks 16 in order to avoid further flow of the material and thus a further undesired change in length.

Vorteilhafterweise sind die Prägestempel abhängig vom zu verfor­menden Material und dessen Profil und Durchmesser zylindrisch in einem bestimmten Durchmesser und mit einer geringen Aushebeschräge ausgebildet, um einmal eine gewünschte konstante, fein dosierte Längenänderung in diesem Fall im Verhältnis von ca. 10 : 1, zu erreichen, zum anderen, um ein Klemmen beim Zurückziehen der Präge­stempel aus dem verformten Material zu vermeiden. Mit diesem Hub­einstellverfahren ist eine Einstellgenauigkeit von ≧ 0.001 mm er­reichbar.Depending on the material to be deformed and its profile and diameter, the embossing stamps are advantageously cylindrical in a certain diameter and with a small lifting bevel in order to achieve a desired constant, finely metered change in length in this case in a ratio of approx. 10: 1. on the other hand, to avoid jamming when the dies are withdrawn from the deformed material. With this stroke adjustment method, an adjustment accuracy of ≧ 0.001 mm can be achieved.

Anschließend an die unter angelegter Spannung bei stets geöffnetem Einspritzventil durchgeführte Hubeinstellung erfolgt die Einstellung der Federkraft der Feder 10 bei dynamischem Betrieb des Ventils, d.h. dieses wird mit einer festgelegten Frequenz und Öffnungsdauer getaktet, wobei Brennstoff unter Betriebsdruck anliegt. Dabei wird der auf dem Rundstab 2 angeordnete Spannring 9 mittels eines Werkzeugs 17 axial verschoben. Das Werkzeug 17 ist mit zwei Stempeln ausgerüstet, die durch zwei sich in dem Ventiloberteil 1 befindliche, gegenüberlie­gende Rücklaufbohrungen 6 in Ausnehmungen 18,19 des Spannrings 9 ein­greifen, wobei der eine Stempel zuerst den Spannring 9 auseinanderdrückt und somit die Klemmverbindung löst. Beide Stempel heben oder senken den gelösten Spannring 9, wodurch die Feder 10 mehr oder weniger gespannt wird. Die Position, in der der festgelegte Brennstoffdurchsatz gemessen wird, wird durch Spannen des Spannringes 9 auf den Rundstab 2, unter­stützt durch beide Arme der Vorrichtung 17, fixiert. Dabei fährt der eine Arm der Vorrichtung 17 soweit aus der Ausnehmung 18 des Spannrin­ges 9 heraus, bis die Klemmverbindung zwischen Spannring 9 und Rund­stab 2 wieder hergestellt ist.Following the stroke adjustment carried out with the voltage applied while the injection valve is always open, the spring force of the spring 10 is adjusted during dynamic operation of the valve, i.e. This is clocked with a fixed frequency and opening time, with fuel under operating pressure. The clamping ring 9 arranged on the round rod 2 is axially displaced by means of a tool 17. The tool 17 is equipped with two punches which engage through two opposing return bores 6 in the valve upper part 1 in recesses 18, 19 of the clamping ring 9, the one punch first pushing the clamping ring 9 apart and thus releasing the clamping connection. Both stamps raise or lower the loosened clamping ring 9, whereby the spring 10 is more or less tensioned. The position in which the defined fuel throughput is measured is fixed by tensioning the clamping ring 9 on the round rod 2, supported by both arms of the device 17. One arm of the device 17 moves out of the recess 18 of the clamping ring 9 until the clamping connection between the clamping ring 9 and the round rod 2 is restored.

Für sämtliche Einstellvorgänge wird nur eine Vorrichtung benötigt, wo­bei darauf zu achten ist, daß das Einspritzventil dabei schwimmend auf gehängt ist, um die beim Prägevorgang auftretenden Querkräfte nicht auf das Ventilgehäuse zu übertragen.Only one device is required for all setting processes, it being necessary to ensure that the injection valve is suspended in a floating manner in order not to transmit the transverse forces occurring during the stamping process to the valve housing.

Weiter von Vorteil ist, daß bei Alterung die Veränderung des Hubes durch Zurückfedern des quer zur Längsrichtung verformten Materials maximal nur im Verhältnis ca. 1 : 10 auftreten kann. Eine damit ver­bundene Durchsatzänderung bleibt innerhalb enger Toleranzen.A further advantage is that the change in the stroke due to springing back of the material deformed transversely to the longitudinal direction can only occur in a ratio of approximately 1:10 in the event of aging. An associated change in throughput remains within narrow tolerances.

Claims (4)

1.) Elektromagnetisches Einspritzventil für Brennkraftmaschinen, dessen Brennstoffaustritt von einem durch eine Feder auf einen Ventilsitz belasteten Ventilschließkörper kontrolliert wird, der unter der Kraft­wirkung eines erregten, mittels einer elektrischen Spule und Eisen­kreis in einem eisenfreien Spalt erzeugten Magnetfeldes als Anker wirkt und vom Ventilsitz abhebt, wobei der in die Spule hineinragende Eisenkern als Rundstab ausgeführt und mit einem Abschnitt fest, aber in Längsrichtung justierbar, im Ventilgehäuse eingespannt ist und einen Anschlag für den ventilschließkörper bildet, dadurch gekennzeichnet, daß der nicht eingespannte Abschnitt des Rundstabes (2) quer zur Längs­richtung wenigstens zwei zur Rundstabmitte gerichtete Prägemarken (16) aufweist, die eine bleibende Längsverformung zur Feineinstellung des Ventilhubes bewirkten.1.) Electromagnetic injection valve for internal combustion engines, the fuel outlet of which is controlled by a valve closing body loaded by a spring on a valve seat, which acts as an armature under the force of an excited magnetic field generated by an electrical coil and iron circuit in an iron-free gap and lifts off the valve seat, wherein the iron core protruding into the coil is designed as a round rod and is fixed with a section, but adjustable in the longitudinal direction, clamped in the valve housing and forms a stop for the valve closing body, characterized in that the non-clamped section of the round rod (2) at least transversely to the longitudinal direction has two embossing marks (16) directed towards the center of the round bar, which caused a permanent longitudinal deformation for fine adjustment of the valve stroke. 2.) Einspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß das Ven­tiloberteil (1) im Bereich der Prägemarken (16) Öffnungen (13,14) zum Einführen von Prägewerkzeugen aufweist.2.) Injection valve according to claim 1, characterized in that the valve upper part (1) in the region of the stamping marks (16) has openings (13, 14) for inserting stamping tools. 3.) Einspritzventil nach dem Oberbegriff des Anspruchs 1, dadurch gekenn­zeichnet, daß der nicht eingespannte Abschnitt des Rundstabes (2) einen in Längsrichtung des Rundstabes verstellbaren Spannring (9) aufweist, an dem sich die den Ventilschließkörper (11) belastende Feder (10) ab­stützt, wobei der Spannring (9) durch durch Ventilgehäuseöffnungen (6) einfahrbare Werkzeuge entspannbar und verstellbar ist.3.) An injection valve according to the preamble of claim 1, characterized in that the unconstrained portion of the round rod (2) has an adjustable in the longitudinal direction of the round rod clamping ring (9), at which the valve closing body (11) spring loading (10 ), whereby the clamping ring (9) can be relaxed and adjusted by tools that can be retracted through valve housing openings (6). 4.) Einspritzventil nach Anspruch 3, dadurch gekennzeichnet, daß der nicht eingespannte Abschnitt des Rundstabes (2) quer zur Längs­richtung wenigstens zwei zur Rundstabmitte gerichtete Prägemarken (16) aufweist, die eine bleibende Längsverformung zur Feinein­stellung des Ventilhubes bewirkten.4.) Injection valve according to claim 3, characterized in that the non-clamped section of the round rod (2) transverse to the longitudinal direction has at least two embossing marks (16) directed towards the center of the round rod, which caused permanent longitudinal deformation for fine adjustment of the valve stroke.
EP88111303A 1987-10-17 1988-07-14 Electromagnetic injection valve for internal combustion engines and method for its production Expired - Lifetime EP0312708B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3735288 1987-10-17
DE19873735288 DE3735288A1 (en) 1987-10-17 1987-10-17 ELECTROMAGNETIC INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP0312708A1 true EP0312708A1 (en) 1989-04-26
EP0312708B1 EP0312708B1 (en) 1991-07-03

Family

ID=6338604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111303A Expired - Lifetime EP0312708B1 (en) 1987-10-17 1988-07-14 Electromagnetic injection valve for internal combustion engines and method for its production

Country Status (3)

Country Link
EP (1) EP0312708B1 (en)
DE (2) DE3735288A1 (en)
ES (1) ES2023985B3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0450654A1 (en) * 1990-04-06 1991-10-09 WEBER S.r.l. Electromagnetic fuel metering and atomizing valve for an internal combustion engine fuel supply device
EP0582298A1 (en) * 1992-08-07 1994-02-09 MAGNETI MARELLI S.p.A. Perfected electromagnetic fuel metering and atomizing valve
EP1134405A3 (en) * 2000-03-13 2004-11-17 Denso Corporation Improved structure of fuel injector adjustable in fuel jet characteristic

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10130239A1 (en) * 2001-06-22 2003-01-02 Bosch Gmbh Robert Fuel injector and method for adjusting it
EP1445477B1 (en) * 2003-01-24 2006-04-05 Siemens VDO Automotive S.p.A. Metering device with flow calibrator and method for setting a flow rate of a metering device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731881A (en) * 1972-02-24 1973-05-08 Bowmar Instrument Corp Solenoid valve with nozzle
GB2080627A (en) * 1980-07-21 1982-02-03 Gen Motors Corp Electromagnetic fuel injector with adjustable armature spring
US4384681A (en) * 1978-11-01 1983-05-24 The Bendix Corporation Electromagnetic fuel injector
GB2192427A (en) * 1986-07-12 1988-01-13 Pierburg Gmbh & Co Kg Stroke and spring force adjustment in an electromagnetic fuel-injection valve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3031564A1 (en) * 1980-08-21 1982-04-08 Robert Bosch Gmbh, 7000 Stuttgart ELECTROMAGNETIC FUEL INJECTION VALVE AND METHOD FOR PRODUCING AN ELECTROMAGNETIC FUEL INJECTION VALVE
DE3431677A1 (en) * 1984-08-29 1986-03-13 Robert Bosch Gmbh, 7000 Stuttgart Electromagnetically operable fuel injection valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731881A (en) * 1972-02-24 1973-05-08 Bowmar Instrument Corp Solenoid valve with nozzle
US4384681A (en) * 1978-11-01 1983-05-24 The Bendix Corporation Electromagnetic fuel injector
GB2080627A (en) * 1980-07-21 1982-02-03 Gen Motors Corp Electromagnetic fuel injector with adjustable armature spring
GB2192427A (en) * 1986-07-12 1988-01-13 Pierburg Gmbh & Co Kg Stroke and spring force adjustment in an electromagnetic fuel-injection valve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 92 (M-208)[1237], 16. April 1983; & JP-A-58 15 758 (AISAN KOGYO K.K.) 29-01-1983 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0450654A1 (en) * 1990-04-06 1991-10-09 WEBER S.r.l. Electromagnetic fuel metering and atomizing valve for an internal combustion engine fuel supply device
EP0582298A1 (en) * 1992-08-07 1994-02-09 MAGNETI MARELLI S.p.A. Perfected electromagnetic fuel metering and atomizing valve
US5375772A (en) * 1992-08-07 1994-12-27 Weber S.R.L. Perfected electromagnetic fuel metering and atomizing valve
EP1134405A3 (en) * 2000-03-13 2004-11-17 Denso Corporation Improved structure of fuel injector adjustable in fuel jet characteristic

Also Published As

Publication number Publication date
ES2023985B3 (en) 1992-02-16
EP0312708B1 (en) 1991-07-03
DE3735288A1 (en) 1989-04-27
DE3863526D1 (en) 1991-08-08

Similar Documents

Publication Publication Date Title
DE3802648C2 (en)
DE2948874C2 (en)
EP2222524B1 (en) Pressure regulating valve
WO1998031578A1 (en) Electromagnetic valve and process for setting the stroke of an electromagnetic valve
DE10131201A1 (en) Solenoid valve for controlling an injection valve of an internal combustion engine
DE3736539A1 (en) ELECTROMAGNETIC INJECTION VALVE AND PRODUCTION METHOD THEREFOR
DE4137994A1 (en) ELECTROMAGNETICALLY ACTUABLE INJECTION VALVE WITH A NOZZLE CARRIER AND METHOD FOR PRODUCING A NOZZLE CARRIER OF AN INJECTION VALVE
WO1995016125A1 (en) Electromagnetic valve
EP0182109B1 (en) Solenoid valve for fluid control
WO2003002868A1 (en) Magnetic valve for controlling an injection valve in an internal combustion engine
EP0495793A1 (en) Electromagnetically operated fuel injection valve
DE3328467A1 (en) ELECTROMAGNETICALLY ACTUABLE VALVE
DE3623554A1 (en) ELECTROMAGNETIC, INTERMITTENT INJECTION VALVE
DE2647072A1 (en) Hydraulic system control solenoid valve - has armature with flat end for linearising magnetic force
EP0312708B1 (en) Electromagnetic injection valve for internal combustion engines and method for its production
DE4408145A1 (en) Liquid injection valve
EP0675283A1 (en) Injection valve
DE60306333T2 (en) Two-barrel fuel injection valve and method for adjusting the preload of a loading spring of a spring-loaded injector
EP1332280B1 (en) Fuel injection valve and method for adjustment thereof
DE4431128A1 (en) Method of setting fuel-injection electromagnetic or solenoid valve
DE19835693A1 (en) Fuel injector
DE10216485B4 (en) Method for adjusting a solenoid valve
DE102004013413A1 (en) Fuel injection valve
DE102015107039B4 (en) Solenoid valve and safety-relevant pneumatic system
DE3704542A1 (en) Fuel injection valve

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT

17P Request for examination filed

Effective date: 19890502

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: PIERBURG GMBH

17Q First examination report despatched

Effective date: 19900326

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3863526

Country of ref document: DE

Date of ref document: 19910808

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO ROMA S.P.A.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2023985

Country of ref document: ES

Kind code of ref document: B3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19940603

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19940610

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19940623

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19940713

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19950714

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19950715

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19950714

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19960402

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19960430

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 19990503

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050714