EP0312708B1 - 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

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Publication number
EP0312708B1
EP0312708B1 EP88111303A EP88111303A EP0312708B1 EP 0312708 B1 EP0312708 B1 EP 0312708B1 EP 88111303 A EP88111303 A EP 88111303A EP 88111303 A EP88111303 A EP 88111303A EP 0312708 B1 EP0312708 B1 EP 0312708B1
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EP
European Patent Office
Prior art keywords
valve
round rod
spring
section
closing body
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Expired - Lifetime
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EP88111303A
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German (de)
French (fr)
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EP0312708A1 (en
Inventor
Walter Schauer
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Pierburg GmbH
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Pierburg GmbH
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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
    • F02M61/20—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 patent claim 1 and a method for its production according to the preamble of patent claim 3.
  • 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.
  • JP-A-5815758 discloses an electromagnetic injection valve for internal combustion engines, the fuel outlet of which is controlled by a valve closing body which is loaded by a spring onto a valve seat and acts as an armature under the force of an excited magnetic field generated by an electrical coil and an iron circuit in an iron-free gap and lifts off the valve seat, the iron core protruding into the coil being designed as a round rod and fixed with a section, but adjustable in the longitudinal direction, clamped in the valve housing and, after adjustment, fixed to the valve housing by laser welding.
  • this adjustment does not allow adjustment in the fuel throughput.
  • the object of the invention is therefore to design an injection valve of the type mentioned in such a way that, in the method for its production, 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 claim 3 relates to a method for its production.
  • the advantage that can be achieved with the invention is, in particular, that very simple adjustment methods of the highest accuracy can be achieved at a low cost by a change in length formed by deformation for adjusting the stroke with subsequent adjustment of the spring force 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 in contact with a valve seat 8 in the region of a valve seat body 7 fastened to the valve housing 3 in accordance with its delivery pressure.
  • 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.
  • the stroke of the valve closing body 11, which acts 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 towards valve seat 8 and in this position with neck 12 of 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 dies are advantageously cylindrical in a certain diameter and with a small lift-off 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.

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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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die Erfindung betrifft ein elektromagnetisches Einspritzventil für Brennkraftmaschinen nach dem Oberbegriff des Patentanspruchs 1 und ein Verfahren zu seiner Herstellung nach dem Oberbegriff des Patentanspruchs 3.The invention relates to an electromagnetic injection valve for internal combustion engines according to the preamble of patent claim 1 and a method for its production according to the preamble of patent claim 3.

Derartige Einspritzventile sind bekannt. Hier 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. Here the problem arises that to determine the flow rate there is a need to establish a balance between the spring force loading the valve body and the magnet 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. Furthermore, it is 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 ist 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.
Die JP-A-5815758 offenbart ein 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 nach der Justierung durch Laserschweißen mit dem Ventilgehäuse fixiert wird. Diese Justierung ermöglicht jedoch keine Einstellung bei Brennstoffdurchsatz.From DE-OS 34 31 677 it is already known that a stop bush by squeezing material in Connect punctures that are located on the circumference of the valve needle with a positive connection. 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.
JP-A-5815758 discloses an electromagnetic injection valve for internal combustion engines, the fuel outlet of which is controlled by a valve closing body which is loaded by a spring onto a valve seat and acts as an armature under the force of an excited magnetic field generated by an electrical coil and an iron circuit in an iron-free gap and lifts off the valve seat, the iron core protruding into the coil being designed as a round rod and fixed with a section, but adjustable in the longitudinal direction, clamped in the valve housing and, after adjustment, fixed to the valve housing by laser welding. However, this adjustment does not allow adjustment in the fuel throughput.

Aufgabe der Erfindung ist es daher, ein Einspritzventil eingangs genannter Art derart auszubilden, daß bei dem Verfahren zu seiner Herstellung 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 therefore to design an injection valve of the type mentioned in such a way that, in the method for its production, 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 der Ansprüche 1 und 2 hinsichtlich des Einspritzventils gelöst. Der Anspruch 3 bezieht sich auf ein Verfahren zu seiner Herstellung.This object is achieved by the features of claims 1 and 2 with regard to the injection valve. The claim 3 relates to a method for its production.

Der mit der Erfindung erzielbare 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 that can be achieved with the invention is, in particular, that very simple adjustment methods of the highest accuracy can be achieved at a low cost by a change in length formed by deformation for adjusting the stroke with subsequent adjustment of the spring force via a clamping ring.

Ein Ausführungsbeispiel nach der Erfindung ist in der Zeichnung schematisch dargestellt und wird im folgenden näher beschrieben. Es zeigt:

  • Fig. 1 einen Schnitt durch ein Einspritzventil,
  • Fig. 2 eine Draufsicht auf einen Spannring.
An embodiment according to the invention is shown schematically in the drawing and is described in more detail below. 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. Gleichzeitig 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.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 in contact with a valve seat 8 in the region of a valve seat body 7 fastened to the valve housing 3 in accordance with its delivery pressure. 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.

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.In the present exemplary embodiment, the stroke of the valve closing body 11, which acts 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 towards valve seat 8 and in this position with neck 12 of 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 dies are advantageously cylindrical in a certain diameter and with a small lift-off 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 under applied voltage with the injection valve 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 (3)

1. Electromagnetic injection valve for internal combustion engines, the fuel outlet of which is controlled by a valve closing body (11) which is loaded by a spring on a valve seat (8), which body acts as armature under the effect of the force of an excited magnetic field generated by means of an electric coil (4) and iron circuit in an iron-free gap and lifts away from the valve seat (8), the iron core protruding into the coil (4) being constructed as round rod (2) and being firmly clamped with one section in the upper part (1) of the valve housing and forming a stop for the valve closing body at the section not clamped-in, characterised in that the section of the round rod (2) not clamped-in exhibits at least two embossed marks (16) directed towards the centre of the round rod transversely to the longitudinal direction and openings (13, 14) for introducing embossing tools (15) are arranged in the area of the embossed marks (16) at the top part (1) of the valve.
2. Injection valve according to Claim 1, characterised in that the section of the round rod (2) not clamped-in exhibits a spring stop constructed as clamping ring (9), which is adjustable in the longitudinal direction of the round rod through openings (6) in the valve housing.
3. Production methods for an 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 body acts as armature under the effect of the force of an excited magnetic field generated by means of an electric coil and iron circuit an iron-free gap and lifts away from the valve seat, the iron core protruding into the coil being constructed as round rod and forming a stop for the valve closing body and exhibiting a spring stop according to Claims 1 and 2 and being subjected in a first method step to an axial adjustment in the direction of the valve seat as coarse adjustment of the valve stroke with the aid of a tool and, in a second method step, being fixed with its first section in this position in the valve housing, characterised in that, in a third method step, a fine adjustment of the valve stroke is achieved by a permanent longitudinal deformation of the unfixed section of the round rod (2) by embossing tools (15) engaging in embossing marks (16), and, in a fourth method step, a spring force adjustment of the spring (10) loading the valve closing body (11), on the one hand, is effected by a stop (9) arranged on the unfixed section of the round rod (2), on which the spring (10) is supported, on the other hand, being axially adjusted and subsequently clamped tight.
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

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

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

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DE (2) DE3735288A1 (en)
ES (1) ES2023985B3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1240180B (en) * 1990-04-06 1993-11-27 Weber Srl ELECTROMAGNETICALLY OPERATED FUEL DOSING AND PULVERIZING VALVE FOR AN ENDOTHERMAL MOTOR FEEDING DEVICE
IT227621Y1 (en) * 1992-08-07 1997-12-15 Weber Srl IMPROVEMENT IN ELECTROMAGNETIC ACTIVATED FUEL METERING AND SPRAYER VALVES.
JP3795724B2 (en) * 2000-03-13 2006-07-12 株式会社デンソー Fuel injection apparatus and injection characteristic adjusting method thereof
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 (1)

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Publication number Priority date Publication date Assignee Title
DE3431677A1 (en) * 1984-08-29 1986-03-13 Robert Bosch Gmbh, 7000 Stuttgart Electromagnetically operable fuel injection valve

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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
US4346847A (en) * 1980-07-21 1982-08-31 General Motors Corporation Electromagnetic fuel injector with adjustable armature spring
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
DE3623554A1 (en) * 1986-07-12 1988-01-21 Pierburg Gmbh ELECTROMAGNETIC, INTERMITTENT INJECTION VALVE

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Publication number Priority date Publication date Assignee Title
DE3431677A1 (en) * 1984-08-29 1986-03-13 Robert Bosch Gmbh, 7000 Stuttgart Electromagnetically operable fuel injection valve

Also Published As

Publication number Publication date
DE3735288A1 (en) 1989-04-27
ES2023985B3 (en) 1992-02-16
DE3863526D1 (en) 1991-08-08
EP0312708A1 (en) 1989-04-26

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