EP1550804B1 - Fuel injection valve - Google Patents
Fuel injection valve Download PDFInfo
- Publication number
- EP1550804B1 EP1550804B1 EP20040106142 EP04106142A EP1550804B1 EP 1550804 B1 EP1550804 B1 EP 1550804B1 EP 20040106142 EP20040106142 EP 20040106142 EP 04106142 A EP04106142 A EP 04106142A EP 1550804 B1 EP1550804 B1 EP 1550804B1
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- EP
- European Patent Office
- Prior art keywords
- fuel injection
- armature
- valve needle
- injection valve
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M51/0685—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 and the valve being allowed to move relatively to each other or not being attached to each other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/85—Mounting of fuel injection apparatus
- F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
Definitions
- the invention relates to a fuel injection valve according to the preamble of claim 1.
- DE 101 08 945 A1 discloses a fuel injection valve, in particular for direct injection of fuel into the combustion chamber of an internal combustion engine.
- the fuel injector includes an armature cooperating with a solenoid and a valve needle frictionally connected to the armature, to which is provided a valve closing body which, together with a valve seat surface, forms a sealing seat.
- the valve needle has at one inflow-side end an integrally formed with the valve needle collar-shaped anchor stop on which the armature abuts, wherein a Mitauerflansch engages the anchor so that the Mitiliasch is inserted into the inflow-side end of the valve needle and connectable thereto.
- a disadvantage of the fuel injection valve known from DE 101 08 945 A1 is the production outlay due to the numerous individual parts and the number of welds required for connecting the individual parts individual components during pre-assembly.
- the valve needle is loosely rotatable in the armature, which results due to the manufacturing tolerances of the components stroke changes and thus changes in the injected amount of fuel.
- the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the valve needle is produced in a simple manner by deep drawing stepped, so that at one stage of the valve needle without further Mit instructionalflansche the opening dynamics positively influencing Vorhubfeder can be arranged.
- Vorhubfeder can be produced as a spiral, plate or corrugated spring in a simple manner.
- the existing of anchor, Vorhubfeder, valve needle and anchor stop total component can be pre-assembled with a maximum of one weld.
- valve needle has a Vermosfix ist, which counteracts stroke changes. In this case, a bulge of the valve needle engages in a simple manner in a recess of the armature.
- a fuel injection valve 1 is in the form of a fuel injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines.
- the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
- the fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
- the valve needle 3 is operatively connected to a valve closing body 4 which cooperates with a valve seat body 6 arranged on a valve seat body 5 to form a sealing seat.
- the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has an injection opening 7.
- the nozzle body 2 is preferably connected by welding to an external pole 9 of a magnetic coil 10.
- the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
- the inner pole 13 and the outer pole 9 are separated by a gap 26 and are based on a connecting member 29 from.
- the magnetic coil 10 is connected via a Line 19 is energized by a via an electrical plug contact 17 supplied electric current.
- the plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.
- the valve needle 3 is executed in the present embodiment, a thin-walled hollow cylinder and has a central recess 8. To the fuel line to the sealing seat serve flow openings 14, which are introduced in the wall of the valve needle 3.
- the valve needle 3 has a collar-shaped anchor stop 32, which is preferably welded to the valve needle 3.
- an armature 20 is supported on the anchor stop 32.
- the shoulder 21 is also tubular and formed integrally with the armature 20.
- a Vorhubfeder 15 is arranged, which defines a Anker arthritisweg.
- the valve needle 3 is, as explained in more detail below, formed by deep drawing and formed multi-stepped.
- a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.
- the return spring 23 acts on the valve needle 3 so that in the de-energized state of the magnetic coil 10 of the valve closing body 4 is held in sealing contact with the valve seat surface 6.
- the fuel which is supplied via a central fuel supply 16 and filtered by a filter element 25 is passed through a central recess 22 of the fuel injection valve 1, the recess 8 of the valve needle 3 and via the flow-through openings 14 to the injection opening 7.
- the fuel injection valve 1 is sealed by a seal 28 against a distribution line, not shown.
- the valve needle 3 In the idle state of the fuel injection valve 1, the valve needle 3 is acted upon by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement.
- the armature 20 is acted upon by the Vorhubfeder 15 on the anchor stop 32. Upon excitation of the magnetic coil 10, this builds up a magnetic field, which moves the armature 20 against the spring force of the Vorhubfeder 15 and the return spring 23 in the stroke direction.
- the stroke of the armature 20 is divided into a forward stroke, which serves to close a Vorhubspalts 30, and an opening stroke. The opening stroke and the forward stroke together result in the total stroke, which is predetermined by a working gap 27 located in the rest position between the inner pole 12 and the armature 20.
- the armature 20 After passing through the preliminary stroke against the force of the Vorhubfeder 15, the armature 20 takes the valve needle 3 in the stroke direction.
- the standing with the valve needle 3 in operative connection valve closing body 4 lifts from the valve seat surface 6, whereby the over the recess 8 in the valve needle 3 and through the flow-through openings 14 to the spray opening 7 guided fuel is injected.
- the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 on the valve needle 3 from the inner pole 13, whereby this moves against the stroke direction. As a result, the valve closing body 4 is seated on the valve seat surface 6, and the fuel injection valve 1 is closed. The armature 20 is seated on the anchor stop 32.
- Such a trained valve needle 3 has several advantages. On the one hand, fewer components and thus fewer welds for connecting the components are required, on the other hand, the manufacturing process of deep drawing for the valve needle 3 as such is inexpensive.
- the Vorhubfeder 15 In addition to improving the opening dynamics causes the Vorhubfeder 15 a damping effect against Preller of Ankers 20 at the anchor stop 32 when closing the fuel injection valve 1. Namely, the anchor 20 sets on the anchor stop 32, it may come to a renewed, short-term lifting of the armature 20 from the anchor stop 32. The Vorhubfeder 15 brakes the resulting movement of the armature 20 in the stroke direction, so that the valve needle 3 is unaffected by the movement of the armature 20 and no unwanted, short-term opening operations of the fuel injection valve 1 occur.
- the anchor stop 32 can also be made by deep drawing and fixed, for example, completely without welding by press fitting to the valve needle 3.
- a maximum of one weld seam 34 is required to produce the valve element 3, forward stroke spring 15, armature 20 and armature stop 32, while at least six individual components must be connected via at least three weld seams in fuel injection valves 1 according to the prior art.
- FIG. 2 two different variants for an inventively ausgestaltetes fuel injector 1 with a correspondingly designed valve needle 3 in part in the area of the valve needle 3 and the armature 20 are shown.
- the Vorhubfeder 15 is designed in the form of a coil spring 15.
- the Vorhubfeder 15 is preferably made of flat wire, so that the forward stroke is not changed.
- the spring constant of the Vorhubfeder 15 is substantially smaller than that of the return spring 23rd
- Vorhubfeder 15 a flat spring such. an open or closed corrugated ring or a plate spring can be used. This has the advantage of shorter overall length.
- valve needle 3 has a Vermosfix ist, which in the form of a bulge 31 of the valve needle third is executed.
- Fig. 3 is a schematic section through the valve needle 3 in the region of the bulge 31 is shown schematically.
- the armature 20 has a corresponding indentation 33, in which the bulge 31 of the valve needle 3 engages positively.
- the valve needle 3 can no longer rotate relative to the armature 20, whereby the set stroke remains constant. Functional changes of the fuel injection valve 1 are thus excluded, the endurance behavior is positively influenced.
- the invention is not limited to the illustrated embodiments and also for other forms of anchors 20, for example, for submersible and flat armature, as well as any designs of fuel injectors 1 applicable.
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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 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.
Beispielsweise ist aus der DE 101 08 945 A1 ein Brennstoffeinspritzventil insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum einer Brennkraftmaschine bekannt. Das Brennstoffeinspritzventil umfaßt einen Anker, der mit einer Magnetspule zusammenwirkt, und eine kraftschlüssig mit dem Anker verbundene Ventilnadel, an der ein Ventilschließkörper vorgesehen ist, der zusammen mit einer Ventilsitzfläche einen Dichtsitz bildet. Die Ventilnadel weist an einem zuströmseitigen Ende einen mit der Ventilnadel einstückig ausgebildeten kragenförmigen Ankeranschlag auf, an dem der Anker anschlägt, wobei ein Mitnehmerflansch den Anker so durchgreift, daß der Mitnehmerflansch in das zuströmseitige Ende der Ventilnadel einschiebbar und mit diesem verbindbar ist.For example, DE 101 08 945 A1 discloses a fuel injection valve, in particular for direct injection of fuel into the combustion chamber of an internal combustion engine. The fuel injector includes an armature cooperating with a solenoid and a valve needle frictionally connected to the armature, to which is provided a valve closing body which, together with a valve seat surface, forms a sealing seat. The valve needle has at one inflow-side end an integrally formed with the valve needle collar-shaped anchor stop on which the armature abuts, wherein a Mitnehmerflansch engages the anchor so that the Mitnehmerflansch is inserted into the inflow-side end of the valve needle and connectable thereto.
Nachteilig an dem aus der DE 101 08 945 A1 bekannten Brennstoffeinspritzventil ist insbesondere der Fertigungsaufwand durch die zahlreichen Einzelteile und die dadurch benötigte Anzahl von Schweißnähten zum Verbinden der einzelnen Bauteile bei der Vormontage. Zudem ist die Ventilnadel lose im Anker drehbar, wodurch sich bedingt durch die Fertigungstoleranzen der Bauteile Hubänderungen und somit Änderungen der eingespritzten Brennstoffmenge ergeben.A disadvantage of the fuel injection valve known from DE 101 08 945 A1, in particular, is the production outlay due to the numerous individual parts and the number of welds required for connecting the individual parts individual components during pre-assembly. In addition, the valve needle is loosely rotatable in the armature, which results due to the manufacturing tolerances of the components stroke changes and thus changes in the injected amount of fuel.
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Ventilnadel in einfacher Weise durch Tiefziehen gestuft herstellbar ist, so daß sich an einer Stufe der Ventilnadel ohne weitere Mitnehmerflansche eine die Öffnungsdynamik positiv beeinflussende Vorhubfeder angeordnet werden kann.The fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the valve needle is produced in a simple manner by deep drawing stepped, so that at one stage of the valve needle without further Mitnehmerflansche the opening dynamics positively influencing Vorhubfeder can be arranged.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements of the fuel injection valve specified in the main claim are possible.
Weiterhin ist von Vorteil, daß die Vorhubfeder als Spiral-, Teller- oder Wellringfeder in einfacher Weise herstellbar ist.A further advantage is that the Vorhubfeder can be produced as a spiral, plate or corrugated spring in a simple manner.
Vorteilhafterweise kann das aus Anker, Vorhubfeder, Ventilnadel und Ankeranschlag bestehende Gesamtbauteil mit maximal einer Schweißnaht vormontiert werden.Advantageously, the existing of anchor, Vorhubfeder, valve needle and anchor stop total component can be pre-assembled with a maximum of one weld.
Von Vorteil ist weiterhin, daß die Ventilnadel eine Verdrehfixierung aufweist, welche Hubänderungen entgegenwirkt. Dabei greift eine Auswölbung der Ventilnadel in einfacher Weise in eine Einbuchtung des Ankers ein.A further advantage is that the valve needle has a Verdrehfixierung, which counteracts stroke changes. In this case, a bulge of the valve needle engages in a simple manner in a recess of the armature.
Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
- Fig. 1
- einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils,
- Fig. 2
- zwei verschiedene Ausführungsvarianten der Ventilnadel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils in einer vergrößerten Schnittansicht, und
- Fig. 3
- einen schematischen Querschnitt durch die Ventilnadel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils.
- Fig. 1
- a schematic section through an embodiment of an inventively designed fuel injector,
- Fig. 2
- two different embodiments of the valve needle of an inventively designed fuel injection valve in an enlarged sectional view, and
- Fig. 3
- a schematic cross section through the valve needle of an inventively designed fuel injector.
Ein Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.A fuel injection valve 1 is in the form of a fuel injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines. The fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist. Die Ventilnadel 3 steht mit einem Ventilschließkörper 4 in Wirkverbindung, der mit einer auf einem Ventilsitzkörper 5 angeordneten Ventilsitzfläche 6 zu einem Dichtsitz zusammenwirkt. Bei dem Brennstoffeinspritzventil 1 handelt es sich im Ausführungsbeispiel um ein nach innen öffnendes Brennstoffeinspritzventil 1, welches über eine Abspritzöffnung 7 verfügt. Der Düsenkörper 2 ist vorzugsweise mittels Schweißen mit einem Außenpol 9 einer Magnetspule 10 verbunden. Die Magnetspule 10 ist in einem Spulengehäuse 11 gekapselt und auf einen Spulenträger 12 gewickelt, welcher an einem Innenpol 13 der Magnetspule 10 anliegt. Der Innenpol 13 und der Außenpol 9 sind durch einen Spalt 26 voneinander getrennt und stützen sich auf einem Verbindungsbauteil 29 ab. Die Magnetspule 10 wird über eine Leitung 19 von einem über einen elektrischen Steckkontakt 17 zuführbaren elektrischen Strom erregt. Der Steckkontakt 17 ist von einer Kunststoffummantelung 18 umgeben, die am Innenpol 13 angespritzt sein kann.The fuel injection valve 1 consists of a
Die Ventilnadel 3 ist im vorliegenden Ausführungsbeispiel dünnwandig hohlzylindrisch ausgeführt und weist eine zentrale Ausnehmung 8 auf. Zur Brennstoffleitung zum Dichtsitz dienen Durchströmöffnungen 14, die in der Wandung der Ventilnadel 3 eingebracht sind. Die Ventilnadel 3 weist einen kragenförmigen Ankeranschlag 32 auf, der mit der Ventilnadel 3 vorzugsweise verschweißt ist. Auf dem Ankeranschlag 32 stützt sich ein Anker 20 ab. Dieser steht über eine Schulter 21 kraftschlüssig mit der Ventilnadel 3 in Verbindung. Die Schulter 21 ist dabei ebenfalls rohrförmig und mit dem Anker 20 einstückig ausgebildet. Zwischen der Schulter 21 des Ankers 20 und einer Stufe 35 der Ventilnadel 3 ist eine Vorhubfeder 15 angeordnet, welche einen Ankerfreiweg definiert. Die Ventilnadel 3 ist dabei, wie weiter unten noch näher erläutert, durch Tiefziehen herstellbar und mehrfach gestuft ausgebildet.The
In der Ventilnadel 3 stützt sich eine Rückstellfeder 23 ab, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Hülse 24 auf Vorspannung gebracht wird. Die Rückstellfeder 23 beaufschlagt die Ventilnadel 3 so, daß in unbestromtem Zustand der Magnetspule 10 der Ventilschließkörper 4 in dichtender Anlage an der Ventilsitzfläche 6 gehalten wird.In the
Der Brennstoff, welcher über eine zentrale Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert wird, wird durch eine zentrale Ausnehmung 22 des Brennstoffeinspritzventils 1, die Ausnehmung 8 der Ventilnadel 3 sowie über die Durchströmöffnungen 14 zur Abspritzöffnung 7 geleitet. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Verteilerleitung abgedichtet.The fuel which is supplied via a
Im Ruhezustand des Brennstoffeinspritzventils 1 wird die Ventilnadel 3 von der Rückstellfeder 23 entgegen ihrer Hubrichtung so beaufschlagt, daß der Ventilschließkörper 4 am Ventilsitz 6 in dichtender Anlage gehalten wird. Der Anker 20 liegt beaufschlagt von der Vorhubfeder 15 auf dem Ankeranschlag 32 auf. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Vorhubfeder 15 sowie der Rückstellfeder 23 in Hubrichtung bewegt. Der Hub des Ankers 20 ist dabei in einen Vorhub, der zum Schließen eines Vorhubspalts 30 dient, und einen Öffnungshub aufgeteilt. Der Öffnungshub und der Vorhub ergeben gemeinsam den Gesamthub, der durch einen in der Ruhestellung zwischen dem Innenpol 12 und dem Anker 20 befindlichen Arbeitsspalt 27 vorgegeben ist.In the idle state of the fuel injection valve 1, the
Nach Durchlaufen des Vorhubs entgegen der Kraft der Vorhubfeder 15 nimmt der Anker 20 die Ventilnadel 3 in Hubrichtung mit. Der mit der Ventilnadel 3 in Wirkverbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche 6 ab, wodurch der über die Ausnehmung 8 in der Ventilnadel 3 sowie durch die Durchströmöffnungen 14 zur Abspritzöffnung 7 geführte Brennstoff abgespritzt wird.After passing through the preliminary stroke against the force of the Vorhubfeder 15, the
Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 auf die Ventilnadel 3 vom Innenpol 13 ab, wodurch sich diese entgegen der Hubrichtung bewegt. Dadurch setzt der Ventilschließkörper 4 auf der Ventilsitzfläche 6 auf, und das Brennstoffeinspritzventil 1 wird geschlossen. Der Anker 20 setzt auf dem Ankeranschlag 32 auf.If the coil current is turned off, the
Eine derartig ausgebildete Ventilnadel 3 hat mehrere Vorteile. Zum einen sind weniger Bauteile und dadurch weniger Schweißnähte zum Verbinden der Bauteile erforderlich, zum anderen ist das Herstellungsverfahren des Tiefziehens für die Ventilnadel 3 als solches kostengünstig.Such a trained
Zusätzlich zur Verbesserung der Öffnungsdynamik bewirkt die Vorhubfeder 15 einen Dämpfungseffekt gegen Preller des Ankers 20 am Ankeranschlag 32 beim Schließen des Brennstoffeinspritzventils 1. Setzt nämlich der Anker 20 auf dem Ankeranschlag 32 auf, kann es zu einem erneuten, kurzzeitigen Abheben des Ankers 20 vom Ankeranschlag 32 kommen. Die Vorhubfeder 15 bremst die dabei entstehende Bewegung des Ankers 20 in Hubrichtung ab, so daß die Ventilnadel 3 unbeeinflußt von der Bewegung des Ankers 20 bleibt und keine unerwünschten, kurzzeitigen Öffnungsvorgänge des Brennstoffeinspritzventils 1 auftreten.In addition to improving the opening dynamics causes the Vorhubfeder 15 a damping effect against Preller of Ankers 20 at the
Der Ankeranschlag 32 kann ebenfalls durch Tiefziehen hergestellt werden und beispielsweise völlig ohne Schweißen durch Preßpassung an der Ventilnadel 3 fixiert werden. Zur Herstellung des aus Ventilnadel 3, Vorhubfeder 15, Anker 20 und Ankeranschlag 32 bestehenden Gesamtbauteils ist somit maximal eine Schweißnaht 34 nötig, während bei Brennstoffeinspritzventilen 1 gemäß dem Stand der Technik mindestens sechs einzelne Bauteile über mindestens drei Schweißnähte verbunden werden müssen.The
In Fig. 2 sind zwei verschiedene Varianten für ein erfindungsgemäß ausgestaltetes Brennstoffeinspritzventil 1 mit einer entsprechend ausgeführten Ventilnadel 3 ausschnittsweise im Bereich der Ventilnadel 3 und des Ankers 20 dargestellt. Links in Fig. 2 ist dabei das bereits oben beschriebene Ausführungsbeispiel dargestellt, bei welchem die Vorhubfeder 15 in Form einer Schraubenfeder 15 ausgeführt ist. Die Vorhubfeder 15 ist dabei vorzugsweise aus Flachdraht gefertigt, damit sich der Vorhub nicht verändert. Die Federkonstante der Vorhubfeder 15 ist dabei wesentlich kleiner als diejenige der Rückstellfeder 23.In Fig. 2, two different variants for an inventively ausgestaltetes fuel injector 1 with a correspondingly designed
Alternativ kann auch, wie in Fig. 2 rechts dargestellt, als Vorhubfeder 15 eine Flachfeder wie z.B. ein offener oder geschlossener Wellring oder eine Tellerfeder verwendet werden. Dies hat den Vorteil geringerer Baulänge.Alternatively, as shown in Fig. 2 right, as Vorhubfeder 15 a flat spring such. an open or closed corrugated ring or a plate spring can be used. This has the advantage of shorter overall length.
Weiterhin weist die Ventilnadel 3 eine Verdrehfixierung auf, welche in Form einer Auswölbung 31 der Ventilnadel 3 ausgeführt ist. In Fig. 3 ist ein schematischer Schnitt durch die Ventilnadel 3 im Bereich der Auswölbung 31 schematisiert dargestellt. Der Anker 20 weist eine entsprechende Einbuchtung 33 auf, in welche die Auswölbung 31 der Ventilnadel 3 formschlüssig eingreift. In der Folge kann sich die Ventilnadel 3 nicht mehr relativ zum Anker 20 verdrehen, wodurch der eingestellte Hub konstant bleibt. Funktionsänderungen des Brennstoffeinspritzventils 1 sind somit ausgeschlossen, das Dauerlaufverhalten wird positiv beeinflußt.Furthermore, the
Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und auch für andere Formen von Ankern 20, beispielsweise für Tauch- und Flachanker, sowie beliebige Bauweisen von Brennstoffeinspritzventilen 1 anwendbar.The invention is not limited to the illustrated embodiments and also for other forms of
Claims (8)
- Fuel injection valve (1), in particular for directly injecting fuel into the combustion chamber of a mixture-compressing spark ignition internal combustion engine, having an armature (20) which interacts with a magnet coil (10), having a valve needle (3) which is connected in a force-fitting manner to the armature (20) and on which is provided a valve closing body (4) which, together with a valve seat face (6), forms a sealing seat, and having an armature stop (32) which is connected in a force-fitting and form-fitting manner to the valve needle (3),
characterized
in that the valve needle (3) is produced by means of deep drawing so as to be stepped, and
in that a prestroke spring (15) is arranged between the armature (20) and on a step (35) of the stepped valve needle (3). - Fuel injection valve according to Claim 1,
characterized
in that the prestroke spring (15) is supported on a shoulder (21) of the armature (20). - Fuel injection valve according to Claim 1 or 2,
characterized
in that the prestroke spring (15) is embodied as a spiral spring (15). - Fuel injection valve according to Claim 1 or 2,
characterized
in that the prestroke spring (15) is embodied as an open or closed corrugated ring (15) or as a plate spring (15). - Fuel injection valve according to one of Claims 1 to 4,
characterized
in that the armature stop (32) can be produced by means of deep drawing. - Fuel injection valve according to Claim 5,
characterized
in that the armature stop (32) is pressed onto the valve needle (3). - Fuel injection valve according to Claim 5,
characterized
in that the armature stop (32) is connected to the valve needle (3) by means of a weld seam (34). - Fuel injection valve according to one of Claims 1 to 7,
characterized
in that the valve needle (3) has a rotational fixing arrangement, in which a convexity (31) of the valve needle (3) is in positive engagement with an indentation (33) in the armature (20).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10361761 | 2003-12-29 | ||
DE2003161761 DE10361761A1 (en) | 2003-12-29 | 2003-12-29 | Fuel injector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1550804A1 EP1550804A1 (en) | 2005-07-06 |
EP1550804B1 true EP1550804B1 (en) | 2007-02-21 |
Family
ID=34559784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040106142 Active EP1550804B1 (en) | 2003-12-29 | 2004-11-29 | Fuel injection valve |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1550804B1 (en) |
JP (1) | JP2005195015A (en) |
DE (2) | DE10361761A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005052255B4 (en) * | 2005-11-02 | 2020-12-17 | Robert Bosch Gmbh | Fuel injector |
JP4790441B2 (en) | 2006-02-17 | 2011-10-12 | 日立オートモティブシステムズ株式会社 | Electromagnetic fuel injection valve and method of assembling the same |
JP4576345B2 (en) | 2006-02-17 | 2010-11-04 | 日立オートモティブシステムズ株式会社 | Electromagnetic fuel injection valve |
JP4211814B2 (en) | 2006-07-13 | 2009-01-21 | 株式会社日立製作所 | Electromagnetic fuel injection valve |
DE102007050817A1 (en) | 2007-10-24 | 2009-04-30 | Robert Bosch Gmbh | Electromagnetically actuated valve |
EP2527637B1 (en) * | 2011-05-23 | 2014-10-08 | Continental Automotive GmbH | Injector for injecting fluid |
EP2535552B1 (en) | 2011-06-15 | 2015-02-25 | Continental Automotive GmbH | Valve assembly for an injection valve and injection valve |
WO2013167597A1 (en) * | 2012-05-08 | 2013-11-14 | Continental Automotive Gmbh | Valve assembly for an injection valve and injection valve |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3843862A1 (en) * | 1988-12-24 | 1990-06-28 | Bosch Gmbh Robert | ELECTROMAGNETICALLY ACTUABLE VALVE |
DE10065528A1 (en) * | 2000-12-28 | 2002-07-04 | Bosch Gmbh Robert | Fuel injector |
DE10108945A1 (en) * | 2001-02-24 | 2002-09-05 | Bosch Gmbh Robert | Fuel injector |
DE10136808A1 (en) * | 2001-07-27 | 2003-02-13 | Bosch Gmbh Robert | IC engine fuel injection valve, has magnetic coils and two cooperating armatures with respective positioning springs between latter and valve needle flanges |
DE10142302A1 (en) * | 2001-08-29 | 2003-03-20 | Bosch Gmbh Robert | Fuel injection valve, for the direct fuel injection at an IC motor, has a guide sleeve for the armature return spring, within an axial recess at the valve needle to give a force fit bond with the armature and a firm seating for the spring |
-
2003
- 2003-12-29 DE DE2003161761 patent/DE10361761A1/en not_active Withdrawn
-
2004
- 2004-11-29 EP EP20040106142 patent/EP1550804B1/en active Active
- 2004-11-29 DE DE200450002949 patent/DE502004002949D1/en active Active
- 2004-12-27 JP JP2004378096A patent/JP2005195015A/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DE502004002949D1 (en) | 2007-04-05 |
JP2005195015A (en) | 2005-07-21 |
DE10361761A1 (en) | 2005-07-28 |
EP1550804A1 (en) | 2005-07-06 |
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