EP1774165B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1774165B1
EP1774165B1 EP05752577A EP05752577A EP1774165B1 EP 1774165 B1 EP1774165 B1 EP 1774165B1 EP 05752577 A EP05752577 A EP 05752577A EP 05752577 A EP05752577 A EP 05752577A EP 1774165 B1 EP1774165 B1 EP 1774165B1
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EP
European Patent Office
Prior art keywords
fuel injection
valve
valve sleeve
magnetic
injection valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP05752577A
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German (de)
French (fr)
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EP1774165A1 (en
Inventor
Anh-Tuan Hoang
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1774165A1 publication Critical patent/EP1774165A1/en
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Publication of EP1774165B1 publication Critical patent/EP1774165B1/en
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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
    • 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
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0667—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature acting as a valve or having a short valve body attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—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
    • F02M51/0671—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 having an elongated valve body attached thereto
    • F02M51/0682—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 having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/081—Magnetic constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/081—Magnetic constructions
    • H01F2007/085—Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • Fuel injection valves have, for example for stabilizing and for sealing the actuator on a valve sleeve, which is produced by deep drawing and extends substantially over the entire length of the fuel injection valve.
  • a fuel injection valve is for example from the document DE 101 22 353 A1 known.
  • valve sleeve due to the requirements of their stability consists of a magnetizable material which ensures the operation of the fuel injection valve for a magnetic shunt, so that is not the maximum possible magnetic force for actuating the fuel injection valve available.
  • valve sleeve is made of a material having low magnetic permeability, whereby losses in the magnetic flux can be avoided by the armature of the fuel injection valve and the magnetic force is unrestricted available.
  • the valve sleeve consists of a powder composite material which has iron and non-magnetic admixtures. It is also advantageous that the valve sleeve can be produced in a simple manner by deep drawing.
  • Fig. 1 shows for better understanding of the inventive measures first in a schematic sectional view of a longitudinal section through a fuel injector 1, which is particularly suitable for injecting fuel into a suction pipe of an internal combustion engine, not shown.
  • the fuel injection valve 1 comprises a magnetic coil 2 which is wound on a bobbin 3.
  • the bobbin 3 is encapsulated in a valve housing 4, which serves as the outer pole of the magnetic coil 2, and is closed by a cover 5.
  • a contact lug 6 is formed at the bobbin 3.
  • the bobbin 3 is penetrated by a valve sleeve 7, which is designed tubular.
  • a support tube 8 serves as the inner pole of the magnetic coil 2 and at the same time supports the thin-walled valve sleeve 7.
  • an armature 9 is arranged, which is formed integrally with a valve needle 10, for example.
  • valve needle 10 through-flow openings 11 are provided, which guide the fuel injector 1 flowing through the fuel to a sealing seat.
  • the valve needle 10 is preferably by welding in operative connection with a spherical valve closure member 13 in the embodiment, which forms a sealing seat with a valve seat body 14. Downstream of the sealing seat, at least one spray-discharge opening 15 is formed in a spray-disk 12, from which the fuel is injected into the suction pipe (not shown).
  • the armature 9 is acted upon in the idle state of the fuel injection valve 1 by a return spring 16 so that the fuel injection valve 1 is kept closed by the pressure of the valve closing body 13 on the valve seat body 14.
  • the return spring 16 is arranged in a recess 17 of the armature 9 and the support tube 8 and is brought by an adjusting sleeve 18 to bias.
  • a cup-shaped filter element 19 is preferably pressed into the fuel injection valve 1.
  • the fuel injection valve 1 is sealed by a seal 20 against a fuel distributor line, not shown, and by a further seal 21 with respect to the suction pipe, also not shown.
  • the fuel which is supplied through a central fuel supply 22, flows through the fuel injection valve 1 through the recess 17 and the throughflow openings 11 to the sealing seat and to the injection opening 15.
  • the fuel injection valve 1 is closed as soon as the magnetic coil 2 exciting current is turned off and the magnetic field is degraded so far that the return spring 16, the armature 9 is depressed from the support tube 8, whereby the Valve needle 10 moves in the outflow direction and the valve closing body 13 touches on the valve seat body 14.
  • Fig. 1 As can be seen, the fuel injection valve 1, a valve sleeve 7, which is made continuously deep drawn to reduce manufacturing costs by avoiding components that must be made by machining.
  • the valve sleeve 7 ensures the stability of the fuel injection valve 1 and at the same time seals the magnetic coil 2 from the fuel.
  • valve sleeve 7 Due to its wall thickness, which is determined by the system pressure and the manufacturability, the valve sleeve 7 is magnetic to guide the magnetic flux between the valve housing 4 and the armature 9 and between the valve housing 4 and acting as the inner pole support tube 8.
  • the course of the magnetic flux indicated by A via the valve sleeve 7 constitutes a magnetic shunt in the region denoted by II, since the magnetic flux at least partially follows the lower resistance in the magnetic valve sleeve 7 and thereby avoids the working gap 23. Thereby, the magnetic flux which flows along the B marked course over the working gap 23 is reduced so that the maximum magnetic force available for attracting the armature 9 is reduced.
  • the invention in order to avoid the disadvantages outlined above, it is intended to magnetically weaken the material from which the valve sleeve 7 is made, ie to reduce the saturation induction for the entire valve sleeve 7 and not only for partial regions.
  • the saturation induction of the valve sleeve 7 of originally about 1.7 Tesla by a suitable choice of material for the valve sleeve 7 by more than 50% or in Example can be lowered by about 1 Tesla to about 0.7 Tesla.
  • the saturation induction of the valve sleeve 7 is thus preferably less than 1 Tesla and more preferably less than 0.8 Tesla.
  • Suitable materials which allow such a reduction in saturation induction are, for example, powder composites in which non-magnetic powdery constituents are admixed with the iron starting material or materials which inherently have reduced magnetic properties.
  • valve sleeve 7 Due to the lower permeability of the material of the valve sleeve 7, the proportion of the shunt along the path A decreases in Fig. 2 , so that an increase in performance over one from a higher permeable material produced valve sleeve 7 is made possible.
  • the tightening force of the solenoid 2 can be increased by 20% and more at a constant voltage.
  • Materials with lower magnetic permeability usually also have a lower electrical conductivity, so that in addition to the increase of the static magnetic force and an improvement of the dynamic behavior can be achieved, which for example improvements of the shutdown times by up to 40% can be achieved.
  • the invention is not limited to the illustrated embodiment and is suitable for any construction of fuel injection valves 1, e.g. for fuel injection valves 1 for direct injection or for fuel injection valves 1 with connection to a common rail system.

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

Abstract

A fuel injection valve (1), for fuel injection units on internal combustion engines, comprises a solenoid (2), an armature (9) cooperating with the solenoid (2), a valve sleeve (7) and a support tube (8), arranged in the valve sleeve (7), serving as inner pole for the solenoid (2). The valve sleeve (7) is made from a material with low magnetic permeability.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention relates to a fuel injection valve according to the preamble of claim 1.

Brennstoffeinspritzventile weisen beispielsweise zur Stabilisierung sowie zur Abdichtung des Aktuators eine Ventilhülse auf, welche durch Tiefziehen hergestellt ist und sich im Wesentlichen über die gesamte Baulänge des Brennstoffeinspritzventils erstreckt. Ein solches Brennstoffeinspritzventil ist beispielsweise aus der Druckschrift DE 101 22 353 A1 bekannt.Fuel injection valves have, for example for stabilizing and for sealing the actuator on a valve sleeve, which is produced by deep drawing and extends substantially over the entire length of the fuel injection valve. Such a fuel injection valve is for example from the document DE 101 22 353 A1 known.

Das in Dokument EP 1 429 019 A1 beschriebene elektromagnetisch betätigte Brennstoffeinspritzventil besitzt eine Spule, die in einem Ventilgehäuse gehalten wird. Die Spule wird von einer Hülse durchgriffen, in der wiederum ein fester und ein beweglicher Anker eingebracht sind. Um die Verluste an magnetischem Fluss durch die Hülse zu verringern, ist diese rohrförmige Hülse aus einem Material gefertigt, dessen magnetische Permeabilität niedriger als die magnetische Permeabilität der beiden Anker gewählt ist.That in document EP 1 429 019 A1 described electromagnetically actuated fuel injection valve has a coil which is held in a valve housing. The coil is penetrated by a sleeve, in turn, a fixed and a movable anchor are introduced. To reduce the loss of magnetic flux through the sleeve, this tubular sleeve is made of a material whose magnetic permeability is lower than the magnetic permeability of the two anchors.

Nachteilig an den bekannten Brennstoffeinspritzventilen ist insbesondere, daß die Ventilhülse bedingt durch die Anforderungen an deren Stabilität aus einem magnetisierbaren Werkstoff besteht, welcher beim Betrieb des Brennstoffeinspritzventils für einen magnetischen Nebenschluß sorgt, so daß nicht die maximal mögliche Magnetkraft zur Betätigung des Brennstoffeinspritzventils zur Verfügung steht.A disadvantage of the known fuel injection valves is in particular that the valve sleeve due to the requirements of their stability consists of a magnetizable material which ensures the operation of the fuel injection valve for a magnetic shunt, so that is not the maximum possible magnetic force for actuating the fuel injection valve available.

Es stellt sich somit die Aufgabe, ein Brennstoffeinspritzventil mit einem Material für eine Ventilhülse zu schaffen, das eine geringe magnetische Permeabilität aufweist und das kostengünstig verarbeitet werden kann.It is therefore an object to provide a fuel injection valve with a material for a valve sleeve, which has a low magnetic permeability and can be processed inexpensively.

Die Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Die abhängigen Ansprüche enthalten vorteilhafte Weiterbildungen der Erfindung.The object is solved by the features of claim 1. The dependent claims contain advantageous developments of the invention.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß die Ventilhülse aus einem Material mit geringer magnetischer Permeabilität hergestellt ist, wodurch Verluste im magnetischen Fluß durch den Anker des Brennstoffeinspritzventils vermieden werden können und die Magnetkraft uneingeschränkt zur Verfügung steht. Vorteilhafterweise besteht die Ventilhülse aus einem Pulververbundwerkstoff, welcher Eisen und nichtmagnetische Beimischungen aufweist. Ebenso ist von Vorteil, daß die Ventilhülse in einfacher Weise durch Tiefziehen herstellbar ist.The fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that the valve sleeve is made of a material having low magnetic permeability, whereby losses in the magnetic flux can be avoided by the armature of the fuel injection valve and the magnetic force is unrestricted available. Advantageously, the valve sleeve consists of a powder composite material which has iron and non-magnetic admixtures. It is also advantageous that the valve sleeve can be produced in a simple manner by deep drawing.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen und Verbesserungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous developments and improvements of the claim 1 fuel injector are possible.

Weiterhin ist von Vorteil, daß ein magnetischer Fluß durch die Ventilhülse zugunsten des magnetischen Flusses durch den Anker und den Innenpol des Magnetkreises reduziert wird.Furthermore, it is advantageous that a magnetic flux through the valve sleeve in favor of the magnetic flux through the armature and the inner pole of the magnetic circuit is reduced.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen schematischen Schnitt durch ein Ausführungsbeispiel eines Brennstoffeinspritz- ventils,
Fig. 2
einen auszugsweisen schematischen Ausschnitt aus dem in Fig. 1 dargestellten Brennstoffeinspritzventil im Bereich II in Fig. 1, und
Fig. 3
eine schematische Darstellung der magnetischen Kennlinie des ursprünglichen Materials und des Materials mit veränderten magnetischen Eigenschaften.
An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
a schematic section through an embodiment of a fuel injection valve,
Fig. 2
a partial schematic section of the in Fig. 1 shown fuel injection valve in the area II in Fig. 1 , and
Fig. 3
a schematic representation of the magnetic characteristic of the original material and the material with altered magnetic properties.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Fig. 1 zeigt zur besseren Verständlichkeit der erfindungsgemäßen Maßnahmen zunächst in einer schematisierten Schnittdarstellung einen Längsschnitt durch ein Brennstoffeinspritzventil 1, welches insbesondere zum Einspritzen von Brennstoff in ein nicht näher dargestelltes Saugrohr einer Brennkraftmaschine geeignet ist. Fig. 1 shows for better understanding of the inventive measures first in a schematic sectional view of a longitudinal section through a fuel injector 1, which is particularly suitable for injecting fuel into a suction pipe of an internal combustion engine, not shown.

Das Brennstoffeinspritzventil 1 umfaßt eine Magnetspule 2, die auf einen Spulenträger 3 gewickelt ist. Der Spulenträger 3 ist in einem Ventilgehäuse 4 gekapselt, welches als Außenpol der Magnetspule 2 dient, und ist durch einen Deckel 5 abgeschlossen. Am Spulenträger 3 ist eine Kontaktfahne 6 ausgebildet.The fuel injection valve 1 comprises a magnetic coil 2 which is wound on a bobbin 3. The bobbin 3 is encapsulated in a valve housing 4, which serves as the outer pole of the magnetic coil 2, and is closed by a cover 5. At the bobbin 3, a contact lug 6 is formed.

Der Spulenträger 3 wird von einer Ventilhülse 7 durchgriffen, welche rohrförmig ausgestaltet ist. Ein Stützrohr 8 dient als Innenpol der Magnetspule 2 und stützt gleichzeitig die dünnwandige Ventilhülse 7. Abströmseitig des Stützrohres 8 ist ein Anker 9 angeordnet, der mit einer Ventilnadel 10 beispielsweise einstückig ausgebildet ist. In der Ventilnadel 10 sind Durchströmöffnungen 11 vorgesehen, die den das Brennstoffeinspritzventil 1 durchströmenden Brennstoff zu einem Dichtsitz leiten.The bobbin 3 is penetrated by a valve sleeve 7, which is designed tubular. A support tube 8 serves as the inner pole of the magnetic coil 2 and at the same time supports the thin-walled valve sleeve 7. Downstream of the support tube 8, an armature 9 is arranged, which is formed integrally with a valve needle 10, for example. In the valve needle 10 through-flow openings 11 are provided, which guide the fuel injector 1 flowing through the fuel to a sealing seat.

Die Ventilnadel 10 steht vorzugsweise durch Schweißen in Wirkverbindung mit einem im Ausführungsbeispiel kugelförmigen Ventilschließkörper 13, der mit einem Ventilsitzkörper 14 einen Dichtsitz bildet. Stromabwärts des Dichtsitzes ist in einer Spritzlochscheibe 12 wenigstens eine Abspritzöffnung 15 ausgebildet, aus der der Brennstoff in das nicht weiter dargestellte Saugrohr eingespritzt wird.The valve needle 10 is preferably by welding in operative connection with a spherical valve closure member 13 in the embodiment, which forms a sealing seat with a valve seat body 14. Downstream of the sealing seat, at least one spray-discharge opening 15 is formed in a spray-disk 12, from which the fuel is injected into the suction pipe (not shown).

Der Anker 9 ist im Ruhezustand des Brennstoffeinspritzventils 1 von einer Rückstellfeder 16 so beaufschlagt, daß das Brennstoffeinspritzventil 1 durch den Andruck des Ventilschließkörpers 13 auf den Ventilsitzkörper 14 geschlossen gehalten wird. Die Rückstellfeder 16 ist in einer Ausnehmung 17 des Ankers 9 bzw. des Stützrohres 8 angeordnet und wird durch eine Einstellhülse 18 auf Vorspannung gebracht.The armature 9 is acted upon in the idle state of the fuel injection valve 1 by a return spring 16 so that the fuel injection valve 1 is kept closed by the pressure of the valve closing body 13 on the valve seat body 14. The return spring 16 is arranged in a recess 17 of the armature 9 and the support tube 8 and is brought by an adjusting sleeve 18 to bias.

Zulaufseitig der Einstellhülse 18 ist ein topfförmiges Filterelement 19 in das Brennstoffeinspritzventil 1 vorzugsweise eingepreßt. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 20 gegen eine nicht weiter dargestellte Brennstoffverteilerleitung und durch eine weitere Dichtung 21 gegenüber dem ebenfalls nicht weiter dargestellten Saugrohr abgedichtet. Der Brennstoff, der durch eine zentrale Brennstoffzufuhr 22 zugeleitet wird, durchströmt das Brennstoffeinspritzventil 1 durch die Ausnehmung 17 und die Durchströmöffnungen 11 zum Dichtsitz und zur Abspritzöffnung 15.On the inlet side of the adjusting sleeve 18, a cup-shaped filter element 19 is preferably pressed into the fuel injection valve 1. The fuel injection valve 1 is sealed by a seal 20 against a fuel distributor line, not shown, and by a further seal 21 with respect to the suction pipe, also not shown. The fuel, which is supplied through a central fuel supply 22, flows through the fuel injection valve 1 through the recess 17 and the throughflow openings 11 to the sealing seat and to the injection opening 15.

Wird der Magnetspule 2 über eine nicht weiter dargestellte elektrische Leitung und die Kontaktfahne 6 ein elektrischer Strom zugeführt, baut sich ein magnetisches Feld auf, das bei ausreichender Stärke den Anker 9 entgegen der Kraft der Rückstellfeder 16 entgegen der Strömungsrichtung des Brennstoffs in die Magnetspule 2 hineinzieht. Dadurch wird ein zwischen dem Anker 9 und dem Stützrohr 7 ausgebildeter Arbeitsspalt 23 geschlossen. Durch die Bewegung des Ankers 9 wird auch die mit dem Anker 9 in kraftschlüssiger Verbindung stehende Ventilnadel 10 in Hubrichtung mitgenommen, so daß der Ventilschließkörper 13 vom Ventilsitzkörper 14 abhebt und Brennstoff zur Abspritzöffnung 15 geleitet wird.If the magnetic coil 2 is supplied with an electric current via a not shown electrical lead and the contact lug 6, a magnetic field builds up, which pulls the armature 9 counter to the force of the return spring 16 counter to the flow direction of the fuel into the magnetic coil 2 with sufficient strength , As a result, a working gap 23 formed between the armature 9 and the support tube 7 is closed. By the movement of the armature 9 and the armature 9 in non-positive connection standing valve needle 10 is taken in the stroke direction, so that the valve closing body 13 lifts from the valve seat body 14 and fuel is directed to the injection opening 15.

Das Brennstoffeinspritzventil 1 wird geschlossen, sobald der die Magnetspule 2 erregende Strom abgeschaltet und das Magnetfeld soweit abgebaut ist, daß die Rückstellfeder 16 den Anker 9 vom Stützrohr 8 abdrückt, wodurch sich die Ventilnadel 10 in Abströmrichtung bewegt und der Ventilschließkörper 13 auf dem Ventilsitzkörper 14 aufsetzt.The fuel injection valve 1 is closed as soon as the magnetic coil 2 exciting current is turned off and the magnetic field is degraded so far that the return spring 16, the armature 9 is depressed from the support tube 8, whereby the Valve needle 10 moves in the outflow direction and the valve closing body 13 touches on the valve seat body 14.

Wie aus Fig. 1 hervorgeht, weist das Brennstoffeinspritzventil 1 eine Ventilhülse 7 auf, welche durchgehend tiefgezogen hergestellt ist, um die Herstellungskosten durch Vermeidung von Bauteilen zu senken, die spanend hergestellt werden müssen. Die Ventilhülse 7 gewährleistet die Stabilität des Brennstoffeinspritzventils 1 und dichtet gleichzeitig die Magnetspule 2 gegenüber dem Brennstoff ab.How out Fig. 1 As can be seen, the fuel injection valve 1, a valve sleeve 7, which is made continuously deep drawn to reduce manufacturing costs by avoiding components that must be made by machining. The valve sleeve 7 ensures the stability of the fuel injection valve 1 and at the same time seals the magnetic coil 2 from the fuel.

Bedingt durch ihre Wandstärke, die durch den Systemdruck und die Fertigbarkeit bestimmt ist, ist die Ventilhülse 7 magnetisch, um den magnetischen Fluß zwischen dem Ventilgehäuse 4 und dem Anker 9 sowie zwischen dem Ventilgehäuse 4 und dem als Innenpol fungierenden Stützrohr 8 zu führen.Due to its wall thickness, which is determined by the system pressure and the manufacturability, the valve sleeve 7 is magnetic to guide the magnetic flux between the valve housing 4 and the armature 9 and between the valve housing 4 and acting as the inner pole support tube 8.

Der Verlauf des magnetischen Flusses ist in Fig. 2 im Bereich um die Magnetspule 2 vergrößert dargestellt.The course of the magnetic flux is in Fig. 2 in the area around the solenoid 2 shown enlarged.

Der mit A bezeichnete Verlauf des magnetischen Flusses über die Ventilhülse 7 stellt dabei jedoch einen magnetischen Nebenschluß in dem mit II bezeichneten Bereich dar, da der magnetische Fluß zumindest teilweise dem geringeren Widerstand in der magnetischen Ventilhülse 7 folgt und dabei den Arbeitsspalt 23 vermeidet. Dadurch wird der magnetische Fluß, welcher entlang dem mit B gekennzeichneten Verlauf über den Arbeitsspalt 23 fließt, verringert, so daß die maximal zum Anziehen des Ankers 9 verfügbare Magnetkraft reduziert ist.However, the course of the magnetic flux indicated by A via the valve sleeve 7 constitutes a magnetic shunt in the region denoted by II, since the magnetic flux at least partially follows the lower resistance in the magnetic valve sleeve 7 and thereby avoids the working gap 23. Thereby, the magnetic flux which flows along the B marked course over the working gap 23 is reduced so that the maximum magnetic force available for attracting the armature 9 is reduced.

Folglich muß, um diesen Verlust auszugleichen, die Feldstärke der Magnetspule 2 bzw. die die Magnetspule 2 erregende Spannung erhöht werden, was höhere Betriebsspannungen, höhere Belastungen der Bauteile und höhere Herstellungskosten zur Folge hat.Consequently, in order to compensate for this loss, the field strength of the solenoid 2 and the exciting voltage of the solenoid 2 must be increased, resulting in higher operating voltages, higher component loads and higher manufacturing costs.

Um den Teilfluß gemäß Verlauf A zu reduzieren bzw. zu eliminieren, ist es üblich, mit Hilfe einer sogmagnetischen Trennung den Fluß in der Ventilhülse 7 zu unterbrechen. Der Gesamtfluß verläuft dann im Wesentlichen über den Arbeitsspalt 23 zwischen dem Anker 9 und dem als Innenpol wirkenden Stützrohr 8. Dies erfordert entweder eine mechanische Verbindung zweier magnetischer und einer nichtmagnetischen Teilhülse beispielsweise durch Schweißen oder eine thermische Behandlung der Ventilhülse 7 im Bereich der Magnetspule 2, was kostenintensiv ist und zu einer Beeinträchtigung der mechanischen Festigkeit führen kann.In order to reduce or eliminate the partial flow according to course A, it is customary to interrupt the flow in the valve sleeve 7 with the aid of a so-called magnetic separation. The total flux then runs essentially over the working gap 23 between the armature 9 and the support tube 8 acting as an inner pole. This requires either a mechanical connection of two magnetic and one non-magnetic part sleeve, for example by welding or thermal treatment of the valve sleeve 7 in the region of the magnet coil 2, which is costly and can lead to impairment of mechanical strength.

Erfindungsgemäß ist zur Vermeidung der oben ausgeführten Nachteile vorgesehen, das Material, aus dem die Ventilhülse 7 hergestellt ist, insgesamt magnetisch zu schwächen, also die Sättigungsinduktion für die ganze Ventilhülse 7 und nicht nur für Teilbereiche zu reduzieren.According to the invention, in order to avoid the disadvantages outlined above, it is intended to magnetically weaken the material from which the valve sleeve 7 is made, ie to reduce the saturation induction for the entire valve sleeve 7 and not only for partial regions.

Betrachtet man Fig. 3, in welchem der magnetische Fluß H gegen die magnetische Feldstärke B aufgetragen ist, ist erkennbar, daß die Sättigungsinduktion der Ventilhülse 7 von ursprünglich ca. 1,7 Tesla durch eine geeignete Wahl des Materials für die Ventilhülse 7 um mehr als 50% bzw. im Beispiel um ca. 1 Tesla auf ca. 0,7 Tesla gesenkt werden kann. Die Sättigungsinduktion der Ventilhülse 7 beträgt somit vorzugsweise weniger als 1 Tesla und besonders bevorzugt weniger als 0,8 Tesla.If you look at Fig. 3 , in which the magnetic flux H is plotted against the magnetic field strength B, it can be seen that the saturation induction of the valve sleeve 7 of originally about 1.7 Tesla by a suitable choice of material for the valve sleeve 7 by more than 50% or in Example can be lowered by about 1 Tesla to about 0.7 Tesla. The saturation induction of the valve sleeve 7 is thus preferably less than 1 Tesla and more preferably less than 0.8 Tesla.

Geeignete Materialien, die eine solche Reduktion der Sättigungsinduktion erlauben, sind beispielsweise Pulververbundstoffe, bei welchen dem eisernen Ausgangsmaterial nichtmagnetische pulverförmige Bestandteile beigemischt werden, oder Materialien, welche von Haus aus reduzierte magnetische Eigenschaften aufweisen.Suitable materials which allow such a reduction in saturation induction are, for example, powder composites in which non-magnetic powdery constituents are admixed with the iron starting material or materials which inherently have reduced magnetic properties.

Bedingt durch die geringere Permeabilität des Materials der Ventilhülse 7 verringert sich der Anteil des Nebenschlusses entlang des Wegs A in Fig. 2, so daß eine Leistungssteigerung gegenüber einer aus einem höherpermeablen Material hergestellten Ventilhülse 7 ermöglicht wird. Die Anzugskraft der Magnetspule 2 läßt sich bei konstanter Spannung so um 20% und mehr steigern.Due to the lower permeability of the material of the valve sleeve 7, the proportion of the shunt along the path A decreases in Fig. 2 , so that an increase in performance over one from a higher permeable material produced valve sleeve 7 is made possible. The tightening force of the solenoid 2 can be increased by 20% and more at a constant voltage.

Werkstoffe mit geringerer magnetischer Permeabilität weisen in der Regel auch eine geringere elektrische Leitfähigkeit auf, so daß außer der Steigerung der statischen magnetischen Kraft auch eine Verbesserung des dynamischen Verhaltens erzielbar ist, woraus beispielsweise Verbesserungen der Abschaltzeiten um bis zu 40% erzielbar sind.Materials with lower magnetic permeability usually also have a lower electrical conductivity, so that in addition to the increase of the static magnetic force and an improvement of the dynamic behavior can be achieved, which for example improvements of the shutdown times by up to 40% can be achieved.

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und für beliebige Bauweisen von Brennstoffeinspritzventilen 1 geeignet, z.B. für Brennstoffeinspritzventile 1 für Direkteinspritzung oder für Brennstoffeinspritzventile 1 mit Anbindung an ein Common-Rail-System. The invention is not limited to the illustrated embodiment and is suitable for any construction of fuel injection valves 1, e.g. for fuel injection valves 1 for direct injection or for fuel injection valves 1 with connection to a common rail system.

Claims (4)

  1. Fuel injection valve (1) for fuel injection systems of internal combustion engines, having a magnet coil (2), having an armature (9) which interacts with the magnet coil (2), having a valve sleeve (7) and having a support tube (8) which is arranged in the valve sleeve (7) and which serves as an inner pole for the magnet coil (2), with the valve sleeve (7) being composed of a material with low magnetic permeability,
    characterized
    in that the material is a powder composite material which is composed of an iron basic material and to which non-magnetic powder constituents are admixed, and in that the valve sleeve (7) can be produced by deep drawing.
  2. Fuel injection valve according to Claim 1,
    characterized
    in that a magnetic flux through the valve sleeve (7) is very much smaller than a magnetic flux through the support tube (8) and the armature (9).
  3. Fuel injection valve according to Claim 1 or 2,
    characterized
    in that the valve sleeve (7) is of pot-shaped design.
  4. Fuel injection valve according to one of Claims 1 to 3,
    characterized
    in that the saturation induction of the valve sleeve (7) is less than 1 Tesla, preferably less than 0.8 Tesla.
EP05752577A 2004-07-26 2005-06-03 Fuel injection valve Expired - Fee Related EP1774165B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004036218 2004-07-26
DE102004042592A DE102004042592A1 (en) 2004-07-26 2004-09-02 Fuel injector
PCT/EP2005/052553 WO2006010665A1 (en) 2004-07-26 2005-06-03 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1774165A1 EP1774165A1 (en) 2007-04-18
EP1774165B1 true EP1774165B1 (en) 2010-11-03

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EP05752577A Expired - Fee Related EP1774165B1 (en) 2004-07-26 2005-06-03 Fuel injection valve

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US (1) US20080308658A1 (en)
EP (1) EP1774165B1 (en)
JP (1) JP2008507660A (en)
DE (2) DE102004042592A1 (en)
WO (1) WO2006010665A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006036781A1 (en) * 2006-08-07 2008-02-14 Robert Bosch Gmbh Injector and associated operating method
ATE431500T1 (en) 2007-03-05 2009-05-15 Magneti Marelli Spa ELECTROMAGNETIC VALVE FOR FUEL METERING IN AN INTERNAL COMBUSTION ENGINE
EP2221468A1 (en) * 2009-02-20 2010-08-25 Continental Automotive GmbH Fluid injector
DE102013206958A1 (en) 2013-04-17 2014-10-23 Robert Bosch Gmbh Solenoid valve with improved opening and closing behavior

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5088467A (en) * 1984-03-05 1992-02-18 Coltec Industries Inc Electromagnetic injection valve
JPH0261178U (en) * 1988-10-28 1990-05-07
DE4237405C3 (en) * 1991-12-17 2003-10-30 Mitsubishi Electric Corp Fuel injection device for an internal combustion engine and method for producing a solid core for this injection device
GB2262659B (en) * 1991-12-17 1995-08-23 Mitsubishi Electric Corp A fuel injection device and a method of making a fixed core therof
IT1261156B (en) * 1993-12-30 1996-05-09 Elasis Sistema Ricerca Fiat CONTROL ELECTROMAGNET OF A DOSING VALVE FOR A FUEL INJECTOR
DE19503821A1 (en) * 1995-02-06 1996-08-08 Bosch Gmbh Robert Electromagnetically actuated valve
FR2737043B1 (en) * 1995-07-18 1997-08-14 Imphy Sa IRON-NICKEL ALLOY FOR TENTED SHADOW MASK
DE19547406B4 (en) * 1995-12-19 2007-10-31 Robert Bosch Gmbh Fuel injector
DE19900406A1 (en) * 1999-01-08 2000-07-13 Bosch Gmbh Robert Fuel injector
JP4123323B2 (en) * 1999-06-22 2008-07-23 株式会社デンソー Fuel injection valve
JP2001012636A (en) * 1999-06-29 2001-01-16 Aisan Ind Co Ltd Fuel injection device having a plurality of solenoids and a common cylinder
US6464153B1 (en) * 2000-10-12 2002-10-15 Delphi Technologies, Inc. Fuel injector having a molded shroud formed of a structural adhesive polymer
DE10122353B4 (en) 2001-05-09 2004-04-22 Robert Bosch Gmbh Fuel injector
ITBO20020778A1 (en) * 2002-12-12 2004-06-13 Magneti Marelli Powertrain Spa ELECTROMAGNETIC FUEL INJECTOR FOR AN ENGINE

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DE102004042592A1 (en) 2006-03-23
DE502005010490D1 (en) 2010-12-16
WO2006010665A1 (en) 2006-02-02
EP1774165A1 (en) 2007-04-18
JP2008507660A (en) 2008-03-13
US20080308658A1 (en) 2008-12-18

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