EP1913254B1 - Fuel injection valve and method for shaping discharge ports - Google Patents
Fuel injection valve and method for shaping discharge ports Download PDFInfo
- Publication number
- EP1913254B1 EP1913254B1 EP06763692A EP06763692A EP1913254B1 EP 1913254 B1 EP1913254 B1 EP 1913254B1 EP 06763692 A EP06763692 A EP 06763692A EP 06763692 A EP06763692 A EP 06763692A EP 1913254 B1 EP1913254 B1 EP 1913254B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- fuel injection
- discharge openings
- discharge
- valve seat
- 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
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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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/1826—Discharge orifices having different sizes
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/004—Filling molds with powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
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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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
Definitions
- the invention relates to a fuel injection valve according to the preamble of claim 1 and to a method for forming spray-discharge openings according to the preamble of claim 15.
- a fuel injection valve which has a stepped injection opening.
- the ejection opening is designed starting from a chamber-shaped valve interior in a first opening section with a very small flow-determining opening width, while a subsequent second opening section is significantly widened.
- the second opening portion may be formed either widening cylindrical or conical.
- the ejection openings are introduced by means of conventional technology, such as drilling, milling, embossing or eroding.
- the valve needle is produced by the so-called metal injection molding (MIM) method.
- MIM metal injection molding
- a tubular operating member consisting of an armature portion and a valve sleeve portion is manufactured by injection molding and then sintering.
- the actuating part is connected by means of a welded connection with a valve closing member section, so that the valve needle is composed only of two individual components.
- the anchor portion and valve sleeve portion while a continuous inner longitudinal opening is provided, can flow in the fuel in the direction of the valve closure member portion, which then exits near the valve closure member portion by transverse openings of the valve sleeve portion.
- slide tools are needed to form the transverse openings.
- the fuel injection valve according to the invention with the characterizing features of claim 4 has the advantage that it is particularly simple and inexpensive to produce.
- the valve component having the ejection openings, in particular the valve seat body is produced by means of metal injection molding (MIM).
- MIM metal injection molding
- the present invention is characterized in that stepped injection orifices in large numbers can be formed in a tool-bound manner with high accuracy in a molded part produced by means of the MIM process.
- the erfmdungshacke arrangement and design of the ejection openings in the valve member allows a simultaneous formation of a plurality of reproducible ejection openings.
- first spray discharge opening sections open into a second spray discharge opening section that circulates in the form of a ring or partial ring.
- the inventive method for the formation of injection orifices with the characterizing features of claim 1 has the advantage that it is possible by the axial or radial deformability of the downstream Abspritzö Stammsabroughe the spray orifices to integrate the contours of the Abspritzö Stammsabroughe in a very high variance in an injection mold.
- a fuel injection valve for fuel injection systems of internal combustion engines in which a valve closing body is actuated, which forms a sealing seat together with a formed on a valve seat body valve seat surface.
- a plurality of ejection openings are provided, which are formed downstream of the valve seat surface.
- the ejection openings comprise at least one upstream first ejection opening section and one downstream second ejection opening section with a different opening width.
- a wall region of the second spray-discharge opening region of all spray-discharge openings extends on a partial circle at right angles to the longitudinal axis of the valve component having the spray-discharge openings.
- FIG. 1 illustrated embodiment of a fuel injection valve 1 is carried out in the form of a fuel injection valve 1 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 is an inwardly opening fuel injection valve 1, which has at least two injection openings 7.
- the fuel injection valve 1 is ideally designed as a multi-hole injection valve and therefore has between four and thirty ejection openings 7.
- the nozzle body 2 is sealed by a seal 8 against a valve housing 9.
- the drive is, for example, an electromagnetic circuit comprising a solenoid coil 10 as an actuator, which 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 valve housing 9 are separated by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29.
- the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
- the plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.
- valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped.
- armature 20 On the other side of the dial 15 is an armature 20. This is connected via a first flange 21 frictionally with the valve needle 3 in connection, which is connected by a weld 22 with the first flange 21.
- a return spring 23 On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by an adjusting sleeve 24 to bias.
- valve needle guide 14 in the armature 20 and on a guide body 41 extend fuel channels 30, 31 and 32.
- the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
- the fuel injection valve 1 is sealed by a seal 28 against a fuel distributor line, not shown, and by a further seal 36 against a cylinder head not shown.
- annular damping element 33 On the downstream side of the armature 20, an annular damping element 33, which consists of an elastomer material, arranged. It rests on a second flange 34 which is non-positively connected to the valve needle 3 via a weld seam 35.
- the armature 20 In the idle state of the fuel injection valve 1, the armature 20 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 surface 6 in sealing engagement. Upon excitation of the magnetic coil 10, this builds up a magnetic field which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, wherein the stroke is predetermined by a in the rest position between the inner pole 12 and the anchor 20 befmdlichen working gap 27.
- the armature 20 takes the first flange 21, which welded to the valve needle 3 is, also in the stroke direction with.
- the valve closing body 4 communicating with the valve needle 3 lifts off from the valve seat surface 6, and the fuel is sprayed off through the ejection openings 7.
- the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the valve connected to the needle 3 in communication first flange 21 moves against the stroke direction.
- the valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.
- the ejection openings 7 in the valve seat body 5 are designed specifically.
- the valve seat body 5 is advantageously produced by means of the so-called MIM process.
- MIM metal injection molding
- the already known and also referred to as metal injection molding (MIM) method comprises the production of moldings from a metal powder with a binder, for.
- a plastic binder which are mixed together and homogenized, for example, on conventional plastic injection molding machines and the subsequent removal of the binder and sintering of the remaining metal powder scaffold.
- the composition of the metal powder can be tuned in a simple manner to optimum magnetic and thermal properties.
- the present invention is characterized in that stepped ejection openings 7 in large numbers in a molded part produced by MIM method, here in the valve seat body. 5 particularly easy and inexpensive and tool-bound are formed with high accuracy.
- stepped ejection openings 7 in large numbers in a molded part produced by MIM method, here in the valve seat body. 5 particularly easy and inexpensive and tool-bound are formed with high accuracy.
- each Abspritzöfnung or in stepped spray openings each downstream Abspritzö Stammsabites has its own solid angle.
- simultaneous shaping of a multiplicity of ejection openings 7 in the valve seat body 5 is aggravating.
- the ejection openings 7 can be formed particularly favorably if all ejection openings 7 of a partial circle at least in their respective downstream Abspritzö Stammö Stammsabites 7 "parallel to the longitudinal axis 40 of the ejection openings 7 having valve member, here
- the longitudinal axis 40 of the valve seat body 5 coincides with the valve longitudinal axis in the illustrated embodiments, but the valve seat body 5 could also be attached at an angle to the fuel injection valve 1 for oblique injection.
- FIG. 2 shows the detail II in the region of a spray opening 7 in FIG. 1 in an enlarged view in a first embodiment, wherein it is clear that the injection orifice 7 comprises two spray-discharge orifice sections 7 ', 7 ".
- the upstream first spray-discharge orifice section 7' has a significantly smaller opening width than the downstream, second spray-discharge orifice section 7".
- the orientation of the two spray discharge opening sections 7 ', 7 "of one and the same spray discharge opening 7 may be different, but the wall region 42 of the second spray discharge opening section 7" of all spray discharge openings 7 running parallel to the longitudinal axis 40 is essential on a pitch circle. In this case, the parallel wall region 42 should lie on the inner side lying to the longitudinal axis 40.
- FIG. 2 illustrated and the entire Abspritzöschensabites 7 "extend parallel to the axis.
- FIG. 3 is a second embodiment of a discharge opening 7 in a valve seat body 5 in a with Fig. 2 comparable section representation shown.
- the wall region 42 formed on the inner side facing the longitudinal axis 40 is designed to extend parallel to the longitudinal axis 40, while on the side remote from the longitudinal axis 40, the wall region extends obliquely outwards.
- the arrows 44 in the FIGS. 2 and 3 to indicate that in such an embodiment of the Abspritzö Stammsabitese 7 "in the ideal manner in the MIM process all spray-discharge 7 at the same time tool-bound are axially demolded.
- the invention is not limited to the illustrated embodiments and z. B. for differently arranged ejection openings 7 and for any construction of inwardly opening multi-hole fuel injectors 1 applicable. In particular, all features of the invention can be combined as desired.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1 und von einem Verfahren zur Ausformung von Abspritzöffnungen nach der Gattung des Anspruchs 15.The invention relates to a fuel injection valve according to the preamble of claim 1 and to a method for forming spray-discharge openings according to the preamble of
Aus der
Aus der
Aus der
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Anspruchs 4 hat den Vorteil, dass es besonders einfach und kostengünstig herstellbar ist. In idealer Weise wird das die Abspritzöffnungen aufweisenden Ventilbauteil, insbesondere der Ventilsitzkörper, mittels Metal-Injection-Molding-Verfahren (MIM) hergestellt. Die vorliegende Erfindung zeichnet sich dadurch aus, dass gestufte Abspritzöffnungen in großer Anzahl in einem mittels MIM-Verfahren hergestellten Formteil mit hoher Genauigkeit werkzeuggebunden ausformbar sind. Die erfmdungsgemäße Anordnung und Ausführung der Abspritzöffnungen in dem Ventilbauteil ermöglicht eine zeitgleiche Ausformung einer Vielzahl von reproduzierbaren Abspritzöffnungen.The fuel injection valve according to the invention with the characterizing features of
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 4 angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements and improvements of
Besonders vorteilhaft ist es, dass alle Abspritzöffnungen eines Teilkreises mit ihren stromabwärtigen Abspritzöffnungsabschnitten mit einem einmalig zu erstellenden Werkzeug axial oder radial entformbar sind.It is particularly advantageous that all ejection openings of a partial circle with their downstream spray opening sections can be demoulded axially or radially with a tool that is to be created once.
Von Vorteil kann es sein, wenn mehrere erste Abspritzöffnungsabschnitte in einen ring- oder teilringförmig umlaufenden zweiten Abspritzöffnungsabschnitt münden.It can be advantageous if a plurality of first spray discharge opening sections open into a second spray discharge opening section that circulates in the form of a ring or partial ring.
Das erfindungsgemäße Verfahren zur Ausformung von Abspritzöffnungen mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, dass es durch die axiale bzw. radiale Ausformbarkeit der stromabwärtigen Abspritzöffnungsabschnitte der Abspritzöffnungen möglich ist, die Konturen der Abspritzöffnungsabschnitte in einer sehr hohen Varianz in einem Spritzgießwerkzeug zu integrieren. Es ergeben sich erhebliche Kostenvorteile gegenüber bekannten Lösungen, da die Abspritzöffnungen mitThe inventive method for the formation of injection orifices with the characterizing features of claim 1 has the advantage that it is possible by the axial or radial deformability of the downstream Abspritzöffnungsabschnitte the spray orifices to integrate the contours of the Abspritzöffnungsabschnitte in a very high variance in an injection mold. There are significant cost advantages over known solutions, since the spray openings with
Aus der
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 Brennstoffeinspritzventils mit erfindungsgemäß ausgeformten Abspritzöffnungen in einem Ventilsitzkörper,
- Fig. 2
- den Ausschnitt II im Bereich einer Abspritzöffnung in
Fig. 1 in einer vergrößerten Darstellung, wobei die Abspritzöffnung in einer ersten Ausführung ausgestaltet ist, - Fig. 3
- einen Ventilsitzkörper mit einer Abspritzöffnung in einer zweiten Ausführung in einer mit
Fig. 2 vergleichbaren Ausschnittsdarstellung und - Fig. 4
- einen Ventilsitzkörper mit einer Abspritzöffnung in einer dritten Ausführung in einer mit
Fig. 2 vergleichbaren Ausschnittsdarstellung.
- Fig. 1
- a schematic section through an embodiment of a fuel injection valve according to the invention formed with injection orifices in a valve seat body,
- Fig. 2
- the cutout II in the area of a spray opening in
Fig. 1 in an enlarged view, wherein the ejection opening is configured in a first embodiment, - Fig. 3
- a valve seat body having a discharge opening in a second embodiment in a with
Fig. 2 comparable detail view and - Fig. 4
- a valve seat body having a discharge opening in a third embodiment in a
Fig. 2 comparable excerpt.
Ein in
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 an 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 wenigstens zwei Abspritzöffnungen 7 verfügt. Das Brennstoffeinspritzventil 1 ist jedoch idealerweise als Mehrloch-Einspritzventil ausgeführt und hat deshalb zwischen vier und dreißig Abspritzöffnungen 7. Der Düsenkörper 2 ist durch eine Dichtung 8 gegen ein Ventilgehäuse 9 abgedichtet. Als Antrieb dient z.B. ein elektromagnetischer Kreis, der eine Magnetspule 10 als Aktuator umfasst, die in einem Spulengehäuse 11 gekapselt und auf einen Spulenträger 12 gewickelt ist, welcher an einem Innenpol 13 der Magnetspule 10 anliegt. Der Innenpol 13 und das Ventilgehäuse 9 sind durch eine Verengung 26 voneinander getrennt und miteinander durch ein nicht ferromagnetisches Verbindungsbauteil 29 verbunden. 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 in einer Ventilnadelführung 14 geführt, welche scheibenförmig ausgeführt ist. Zur Hubeinstellung dient eine zugepaarte Einstellscheibe 15. Auf der anderen Seite der Einstellscheibe 15 befindet sich ein Anker 20. Dieser steht über einen ersten Flansch 21 kraftschlüssig mit der Ventilnadel 3 in Verbindung, welche durch eine Schweißnaht 22 mit dem ersten Flansch 21 verbunden ist. Auf dem ersten Flansch 21 stützt sich eine Rückstellfeder 23 ab, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Einstellhülse 24 auf Vorspannung gebracht wird.The
In der Ventilnadelführung 14, im Anker 20 und an einem Führungskörper 41 verlaufen Brennstoffkanäle 30, 31 und 32. Der Brennstoff wird über eine zentrale Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Brennstoffverteilerleitung und durch eine weitere Dichtung 36 gegen einen nicht weiter dargestellten Zylinderkopf abgedichtet.In the
Auf der stromabwärtigen Seite des Ankers 20 ist ein ringförmiges Dämpfungselement 33, welches aus einem Elastomerwerkstoff besteht, angeordnet. Es liegt auf einem zweiten Flansch 34 auf, welcher über eine Schweißnaht 35 kraftschlüssig mit der Ventilnadel 3 verbunden ist.On the downstream side of the
Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Anker 20 von der Rückstellfeder 23 entgegen seiner Hubrichtung so beaufschlagt, dass der Ventilschließkörper 4 an der Ventilsitzfläche 6 in dichtender Anlage gehalten wird. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt, wobei der Hub durch einen in der Ruhestellung zwischen dem Innenpol 12 und dem Anker 20 befmdlichen Arbeitsspalt 27 vorgegeben ist. Der Anker 20 nimmt den ersten Flansch 21, welcher mit der Ventilnadel 3 verschweißt ist, ebenfalls in Hubrichtung mit. Der mit der Ventilnadel 3 in Verbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche 6 ab, und der Brennstoff wird durch die Abspritzöffnungen 7 abgespritzt.In the idle state of the fuel injection valve 1, the
Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 vom Innenpol 13 ab, wodurch sich der mit der Ventilnadel 3 in Verbindung stehende erste Flansch 21 entgegen der Hubrichtung bewegt. Die Ventilnadel 3 wird dadurch in die gleiche Richtung bewegt, wodurch der Ventilschließkörper 4 auf der Ventilsitzfläche 6 aufsetzt und das Brennstoffeinspritzventil 1 geschlossen wird.If the coil current is turned off, the
Erfindungsgemäß sind die Abspritzöffnungen 7 im Ventilsitzkörper 5 spezifisch ausgeführt. Der Ventilsitzkörper 5 wird in vorteilhafter Weise mittels so genanntem MIM-Verfahren hergestellt. Das bereits bekannte und auch als Metal-Injection-Molding (MIM) bezeichnete Verfahren umfasst die Herstellung von Formteilen aus einem Metallpulver mit einem Bindemittel, z. B. einem Kunststoffbindemittel, die miteinander gemischt und homogenisiert werden, beispielsweise auf konventionellen Kunststoffspritzgießmaschinen und das nachfolgende Entfernen des Bindemittels und Sintern des verbleibenden Metallpulvergerüsts. Die Zusammensetzung des Metallpulvers kann dabei auf einfache Weise auf optimale magnetische und thermische Eigenschaften abgestimmt werden.According to the invention, the
Bei Brennstoffeinspritzventilen 1 zum direkten Einspritzen von Brennstoff in den Brennraum einer Brennkraftmaschine besteht ein erhebliches Risiko der Belagbildung an den stromabwärtigen Bauteilen, wie Spritzlochscheiben und Ventilsitzkörpern. Insbesondere sind die Abspritzöffnungen 7 anfällig gegen eine Verkokung des freien Querschnitts, so dass es in nachteiliger Weise zu Mindermengen gegenüber den gewünschten Abspritzmengen kommen kann. Entsprechend wünschenswert ist es, den Temperaturhaushalt im Bereich des stromabwärtigen Endes des Brennstoffeinspritzventils 1 rund um den Ventilsitzkörper 5 gezielt einzustellen. Außerdem soll bestmöglich sichergestellt werden, dass über die Abspritzöffnungen 7 über die gesamte Lebensdauer des Brennstoffeinspritzventils 1 eine konstante Durchflussmenge abspritzbar ist. Es wurde herausgefunden, dass insbesondere bei gestuften Abspritzöffnungen 7, die in stromabwärtiger Richtung eine Öffnungsweitenvergrößerung besitzen, die Neigung zur Belagbildung, Verkokung und damit die Gefahr des Zusetzens des freien Querschnitts der Abspritzöffnungen 7 erheblich reduziert sind.In fuel injection valves 1 for injecting fuel directly into the combustion chamber of an internal combustion engine, there is a considerable risk of the formation of deposits on the downstream components, such as spray perforated disks and valve seat bodies. In particular, the
Die vorliegende Erfindung zeichnet sich dadurch aus, dass gestufte Abspritzöffnungen 7 in großer Anzahl in einem mittels MIM-Verfahren hergestellten Formteil, hier in dem Ventilsitzkörper 5 besonders einfach und kostengünstig und mit hoher Genauigkeit werkzeuggebunden ausformbar sind. Bei bekannten Abspritzöffnungen von Brennstoffeinspritzventilen, die als Mehrloch-Ventile ausgeführt sind, besitzt jede Abspritzöfnung bzw. bei gestuften Abspritzöffnungen jeder stromabwärtige Abspritzöffnungsabschnitt einen eigenen Raumwinkel. Für eine optimierte und kostengünstige und damit zeitgleiche Ausformung einer Vielzahl von Abspritzöffnungen 7 ist eine solche Anordnung und Ausführung der Abspritzöffnungen 7 im Ventilsitzkörper 5 erschwerend.The present invention is characterized in that stepped
Besonders vorteilhaft ist es deshalb, die gestuften Abspritzöffnungen 7 spezifisch auszuformen. In dem Metal-Injection-Molding-Prozess zur Herstellung des Ventilsitzkörpers 5 lassen sich die Abspritzöffnungen 7 besonders günstig ausformen, wenn alle Abspritzöffnungen 7 eines Teilkreises zumindest in ihrem jeweiligen stromabwärtigen Abspritzöffnungsabschnitt 7" einen parallel zur Längsachse 40 des die Abspritzöffnungen 7 aufweisenden Ventilbauteils, hier des Ventilsitzkörpers 5, verlaufenden Wandungsbereich 42 aufweisen. Die Längsachse 40 des Ventilsitzkörpers 5 fällt in den dargestellten Ausführungsbeispielen mit der Ventillängsachse zusammen. Der Ventilsitzkörper 5 könnte jedoch auch unter einem Winkel an dem Brennstoffeinspritzventil 1 zur Schrägabspritzung befestigt werden.It is therefore particularly advantageous to form the stepped
In
In einer dritten Ausführung einer Abspritzöffnung 7 in einem Ventilsitzkörper 5, die ebenfalls in einer mit
Anstelle der Abspritzöffnungsabschnitte 7" für jede einzelne Abspritzöffnung 7 kann der stromabwärtige Abspritzöffnungsabschnitt 7" auch teilringförmig oder vollständig ringförmig umlaufen, in den dann einige oder alle stromaufwärtigen Abspritzöffnungsabschnitte 7' münden. Entsprechend sind dann jedoch auch Wandungsbereiche 42, 43 des teilring- bzw. ringförmigen Abspritzöffnungsabschnitts 7" entweder parallel oder im rechten Winkel zur Längsachse 40 des Ventilsitzkörpers 5 ausgeführt.Instead of the
Durch die axiale bzw. radiale Ausformbarkeit der Abspritzöffungsabsehnitte 7" der Abspritzöffnungen 7 ist es möglich, die Konturen der Abspritzöffnungsabschnitte 7" in einer sehr hohen Varianz in einem Spritzgießwerkzeug zu integrieren. Es ergeben sich erhebliche Kostenvorteile gegenüber bekannten Lösungen, da die Abspritzöffnungen 7 mit ihren Abspritzöffnungsabschnitten 7" werkzeuggebunden hergestellt werden können. Bekannte separate Arbeitsgänge zur Herstellung der Abspritzöffnungsabschnitte 7" wie z.B. Stanzen, Bohren, Erodieren oder Laserbohren können entfallen. Mit hohen Qualitätsmerkmalen unter Einhaltung aller Maßtoleranzen, Formtoleranzen und Lagetoleranzen lassen sich die Abspritzöffnungen 7 mit ihren Abspritzöffnungsabschnitten 7" erfindungsgemäß mit hoher Reproduzierbarkeit herstellen.Due to the axial or radial deformability of the
Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und z. B. für andersartig angeordnete Abspritzöffnungen 7 sowie für beliebige Bauweisen von nach innen öffnenden Mehrloch-Brennstoffeinspritzventilen 1 anwendbar. Insbesondere sind alle Merkmale der Erfindung beliebig kombinierbar.The invention is not limited to the illustrated embodiments and z. B. for differently arranged
Claims (4)
- Method for shaping discharge openings (7) on a valve component (5), which has discharge openings (7), of a fuel injection valve (1),
characterized
in that the valve component (5) is produced by means of a metal injection moulding method having the method steps:- mixing and homogenization of a metal powder and a binding agent,- subsequent injection moulding,- removal of the binding agent, and- sintering of the metal powder structure,and the discharge openings (7) are shaped so as to comprise at least one upstream first discharge opening portion (7') and one downstream second discharge opening portion (7'') with a different opening width, and one wall region (42, 43) of the second discharge opening region (7") of all of the discharge openings (7) runs on a pitch circle either parallel or at right angles to the longitudinal axis (40) of the valve component which has the discharge openings (7). - Method according to Claim 1,
characterized
in that the discharge opening portions (7") of all of the discharge openings (7) of a pitch circle are removed axially from the mould at the same time. - Method according to Claim 1,
characterized
in that the discharge opening portions (7") of all of the discharge openings (7) of a pitch circle are removed radially from the mould at the same time. - Fuel injection valve for fuel injection systems of internal combustion engines, having an excitable actuator (10) for actuating a valve closing body (4) which forms a sealing seat together with a valve seat surface (6) formed on a valve seat body (5), and having discharge openings (7) which are formed downstream of the valve seat surface (6),
characterized
in that the valve component which has the discharge openings (7), in particular the valve seat body (5), is produced by means of a metal injection moulding method according to one of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005036951A DE102005036951A1 (en) | 2005-08-05 | 2005-08-05 | Fuel injection valve and method for forming injection openings |
PCT/EP2006/063176 WO2007017305A1 (en) | 2005-08-05 | 2006-06-14 | Fuel injection valve and method for shaping discharge ports |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1913254A1 EP1913254A1 (en) | 2008-04-23 |
EP1913254B1 true EP1913254B1 (en) | 2012-11-21 |
Family
ID=36781441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06763692A Expired - Fee Related EP1913254B1 (en) | 2005-08-05 | 2006-06-14 | Fuel injection valve and method for shaping discharge ports |
Country Status (5)
Country | Link |
---|---|
US (2) | US20100193612A1 (en) |
EP (1) | EP1913254B1 (en) |
JP (1) | JP4991720B2 (en) |
DE (1) | DE102005036951A1 (en) |
WO (1) | WO2007017305A1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006051327A1 (en) * | 2006-10-31 | 2008-05-08 | Robert Bosch Gmbh | Fuel injector |
JP4610631B2 (en) * | 2008-05-01 | 2011-01-12 | 三菱電機株式会社 | Fuel injection valve |
US20110186654A1 (en) * | 2010-02-02 | 2011-08-04 | Delphi Technologies, Inc. | Valve seat for gaseous fuel injector |
DE102011077268A1 (en) * | 2011-06-09 | 2012-12-13 | Robert Bosch Gmbh | Injection valve for internal combustion engines |
DE102011077272A1 (en) | 2011-06-09 | 2012-12-13 | Robert Bosch Gmbh | Injection valve for internal combustion engines |
DE102011077276A1 (en) | 2011-06-09 | 2012-12-13 | Robert Bosch Gmbh | Valve for metering a flowing medium |
JP5295319B2 (en) * | 2011-06-24 | 2013-09-18 | 三菱電機株式会社 | Fuel injection valve |
DE102011078086A1 (en) | 2011-06-27 | 2012-12-27 | Robert Bosch Gmbh | Multi-hole injection valve for injecting fuel into combustion cylinder of combustion engine, has hole portions comprising inlet and exit openings, where openings are defined by opening edges comprising sharp edged teething |
DE102011089240A1 (en) | 2011-12-20 | 2013-06-20 | Robert Bosch Gmbh | Fuel injection valve and method for forming injection openings |
JP2014001660A (en) * | 2012-06-18 | 2014-01-09 | Bosch Corp | Fuel injection valve of internal combustion engine |
DE102012211459A1 (en) * | 2012-07-03 | 2014-01-09 | Robert Bosch Gmbh | Fuel injection valve with improved spray hole |
JP6186130B2 (en) * | 2013-02-04 | 2017-08-23 | 日立オートモティブシステムズ株式会社 | Fuel injection valve and fuel injection valve manufacturing method |
JP6020380B2 (en) * | 2013-08-02 | 2016-11-02 | 株式会社デンソー | Fuel injection valve |
JP5969564B2 (en) * | 2014-10-01 | 2016-08-17 | トヨタ自動車株式会社 | Fuel injection valve |
JP6292188B2 (en) * | 2015-04-09 | 2018-03-14 | 株式会社デンソー | Fuel injection device |
DE112019001538T5 (en) * | 2018-04-25 | 2020-12-10 | Robert Bosch Gmbh | FUEL INJECTOR SEAT ASSEMBLY INCLUDING A POSITIONALLY FORMED INSERT AND METHOD OF MANUFACTURING IT BACKGROUND |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1088666A (en) * | 1964-03-09 | 1967-10-25 | Lister & Co Ltd R A | Improvements in or relating to fuel injectors for internal combustion engines |
JPS58222971A (en) * | 1982-06-22 | 1983-12-24 | Mitsubishi Heavy Ind Ltd | Fuel injection valve |
DE3733604A1 (en) * | 1987-10-05 | 1989-04-13 | Bosch Gmbh Robert | HOLE BODY FOR A FUEL INJECTION VALVE |
JP2819702B2 (en) * | 1989-12-12 | 1998-11-05 | 株式会社デンソー | Fuel injection valve |
DE4230376C1 (en) * | 1992-09-11 | 1993-04-22 | Robert Bosch Gmbh, 7000 Stuttgart, De | |
US6439484B2 (en) * | 2000-02-25 | 2002-08-27 | Denso Corporation | Fluid injection nozzle |
JP3759918B2 (en) * | 2002-10-16 | 2006-03-29 | 三菱電機株式会社 | Fuel injection valve |
US7191961B2 (en) * | 2002-11-29 | 2007-03-20 | Denso Corporation | Injection hole plate and fuel injection apparatus having the same |
US7032566B2 (en) * | 2003-05-30 | 2006-04-25 | Caterpillar Inc. | Fuel injector nozzle for an internal combustion engine |
-
2005
- 2005-08-05 DE DE102005036951A patent/DE102005036951A1/en not_active Withdrawn
-
2006
- 2006-06-14 EP EP06763692A patent/EP1913254B1/en not_active Expired - Fee Related
- 2006-06-14 JP JP2008524459A patent/JP4991720B2/en not_active Expired - Fee Related
- 2006-06-14 US US11/990,053 patent/US20100193612A1/en not_active Abandoned
- 2006-06-14 WO PCT/EP2006/063176 patent/WO2007017305A1/en active Application Filing
-
2014
- 2014-10-17 US US14/516,690 patent/US9803606B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US9803606B2 (en) | 2017-10-31 |
US20100193612A1 (en) | 2010-08-05 |
JP4991720B2 (en) | 2012-08-01 |
US20150034741A1 (en) | 2015-02-05 |
EP1913254A1 (en) | 2008-04-23 |
DE102005036951A1 (en) | 2007-02-08 |
JP2009503353A (en) | 2009-01-29 |
WO2007017305A1 (en) | 2007-02-15 |
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