EP0447502B1 - Fuel injection valve - Google Patents
Fuel injection valve Download PDFInfo
- Publication number
- EP0447502B1 EP0447502B1 EP90911533A EP90911533A EP0447502B1 EP 0447502 B1 EP0447502 B1 EP 0447502B1 EP 90911533 A EP90911533 A EP 90911533A EP 90911533 A EP90911533 A EP 90911533A EP 0447502 B1 EP0447502 B1 EP 0447502B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- magnet
- valve needle
- needle
- magnet armature
- 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 - Lifetime
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 29
- 238000002347 injection Methods 0.000 title claims abstract description 18
- 239000007924 injection Substances 0.000 title claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 5
- 239000000696 magnetic material Substances 0.000 claims description 2
- 230000005291 magnetic effect Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S239/00—Fluid sprinkling, spraying, and diffusing
- Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve
Definitions
- the invention relates to a fuel injection valve for fuel injection devices of internal combustion engines of the type defined in the preamble of claim 1.
- the valve needle In a known fuel injection valve of this type (DE 35 40 660 Al), the valve needle carries an annular stop shoulder in the area between a valve needle guide in the valve chamber and the clamping of the valve needle in the magnet armature, which cooperates with a stop ring representing the stroke stop in the valve housing, the inside diameter of which is smaller than the outside diameter of the stop shoulder and that covers the valve space.
- the stop ring is positioned in the valve housing so that when the stop shoulder rests against the stop ring, a residual air gap remains between the mutually facing end faces of the magnet core and the magnet armature.
- the return spring for the valve needle which is designed as a cylindrical compression spring, is accommodated in the hollow cylindrical interior of the magnetic core and is supported in a recess in the end face of the magnet armature.
- the annular stroke stop for the valve needle has the disadvantage that if the valve needle is not exactly aligned, the stop surface of the annular shoulder on the stop ring changes from annular to crescent-shaped, as a result of which the valve needle stroke does not correspond to the set stroke and, as a result, the amount of fuel injected varies.
- the valve needle carries two relatively large-spaced guide sections with a larger diameter that slide along the inner wall of the valve chamber.
- the guide sections are flattened laterally.
- the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that a central stroke stop with a central stop point is realized while maintaining the adjustment option for the return spring of the valve needle, which in the axis of the Valve housing is.
- the stop surface of the valve needle is therefore always punctiform, even when the valve needle is not exactly aligned, so that there is no change in stroke during the opening stroke of the valve needle.
- the amount of fuel injected is therefore largely constant. Since the valve needle stroke is largely insensitive to the deviation of the valve needle axis from the valve housing axis, the valve needle also does not require any additional guides in the valve chamber, but rather requires guidance by the magnet armature and by centering in the valve seat. The manufacturing outlay for the fuel injector thus drops not insignificantly.
- valve needle fastened in the magnet armature is passed through the magnet armature with its end section facing away from the valve opening, so that it hits the transverse web with its front end during the opening stroke, the result is that the soft magnetic components, such as the magnet armature, are not exposed to mechanical loads from the stroke stop. There is therefore no need to treat the surface of these components separately.
- the valve needle on the other hand, has to be hardened anyway for other reasons, so that it can easily withstand the mechanical loads when struck.
- a further manufacturing simplification of the fuel injection valve according to the invention is achieved in that the magnet armature has a coaxial blind bore that is open towards the magnet core, at the bottom of which the return spring surrounding the valve end section is supported, the slotted adjusting tube ending in the blind hole protrudes, and in that the magnet armature is guided axially displaceably on the adjusting tube with an annular guide section formed near the open end of the blind hole.
- the fuel injection valve shown in longitudinal section in FIG. 1 for a fuel injection device of an internal combustion engine has a three-part housing 10 with an upper part 11, middle part 12 and lower part 13.
- the hollow cylindrical lower part 13 containing a valve chamber 14 and the upper part 11 provided with an axial fuel inlet connection 15 are inserted into the cup-shaped central part 12 and held by flanging.
- the valve space 14 is near the lower end of the lower part 13
- Valve opening 16 delimited, which in turn is surrounded by a valve seat 17.
- a valve needle 18, which is actuated by an electromagnet 20, works together with the valve seat 17.
- An intermediate ring 19 is inserted between the end face of the lower part 13 and the middle part 12 which runs out like a nozzle on the pot bottom.
- the upper part 11 covers the middle part 12 with a flange 21 and projects into the interior of the middle part 12 with a hollow cylindrical, nozzle-like coaxial projection 22. On the outside, the projection 22 continues in one piece into a tube section which forms the fuel inlet connection 15.
- the electromagnet 20 consists in a known manner of a magnet housing, which is formed here directly by the cup-shaped central part 12 made of ferromagnetic material, from a coaxial magnetic core, which is formed here by the projection 22 of the upper part 11, also made of ferromagnetic material, from one the magnetic coil 22 surrounding the magnetic core 22 and a magnetic armature 24 guided in the base region of the central part 12 and opposite the magnetic core 22 on the end face.
- the electrical supply line to the magnetic coil 23 is designated by 37.
- the magnet armature 24 has a coaxial stepped bore 25.
- the smaller-diameter bore section 251 firmly encloses the valve needle 18, which extends through the larger-diameter bore section 252 with a smaller-diameter end section.
- a return spring 27 designed as a compression spring is supported, the other end of which rests against the annular end face of an adjusting tube 28 which is axially displaceable inside the hollow cylindrical upper part 11.
- a stroke stop in the form of a cross piece 32 is fastened inside the hollow cylindrical magnetic core 22.
- the adjusting tube 28 is slotted in the end region facing the return spring 27 and, with this slotted end section, overlaps the transverse web 32 on both sides with play, as can be seen more clearly in FIG. 3.
- the crossbar 32 carries a central, i.e. in the valve housing axis lying stop 33, which is formed by a bulge 34 on the end face of the transverse web 32 facing the valve needle 18.
- the arrangement and design of the magnet armature 24, the crosspiece 32 and the valve needle 18 is such that when the front end of the valve needle 18 is in contact with the stop 33 on the crosspiece 32, a residual air gap 35 remains between the facing end face of the magnet armature 24 and the magnet core 22, as can be seen in the enlarged representation in FIG. 2.
- the maximum stroke of the valve needle 18 is characterized by the distance h in Fig. 2.
- the crossbar 32 and the adjusting tube 28 are made of non-magnetic material.
- the stop surface of the valve needle on the crosspiece 32 is always punctiform, even if the valve needle 18 is not exactly aligned with the axis of the valve housing 10.
- the valve needle stroke thus remains constant even when the valve needle 18 is not exactly aligned. Every time the fuel injection valve is opened, the exact same fuel injection quantity is sprayed out.
- the hollow cylindrical magnet armature 24 carries at the end a radially inwardly projecting annular guide section 36 which is integral with the magnet armature 24. With this guide section 36, the magnet armature 24 slides almost without play on the adjusting tube 28, as a result of which the magnet armature 24 is also guided exactly outside the bottom region of the magnet housing or the central part 12. Additional guide means for the valve needle 18 can thus be omitted.
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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)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Die Erfindung geht aus von einem Kraftstoffeinspritzventil für Kraftstoffeinspritzeinrichtungen von Brennkraftmaschinen der im Oberbegriff des Anspruchs 1 definierten Gattung.The invention relates to a fuel injection valve for fuel injection devices of internal combustion engines of the type defined in the preamble of claim 1.
Bei einem bekannten Kraftstoffeinspritzventil dieser Art (DE 35 40 660 Al) trägt die Ventilnadel im Bereich zwischen einer Ventilnadelführung im Ventilraum und der Einspannung der Ventilnadel im Magnetanker eine ringförmige Anschlagschulter, die mit einem den Hubanschlag darstellenden Anschlagring im Ventilgehäuse zusammenwirkt, dessen lichter Durchmesser kleiner ist als der Außendurchmesser der Anschlagschulter und der den Ventilraum überdeckt. Der Anschlagring ist im Ventilgehäuse so positioniert, daß beim Anliegen der Anschlagschulter an dem Anschlagring zwischen den einander zugekehrten Stirnseiten von Magnetkern und Magnetanker ein Restluftspalt verbleibt.In a known fuel injection valve of this type (
Die als zylindrische Druckfeder ausgebildete Rückstellfeder für die Ventilnadel ist im hohlzylindrischen Innern des Magnetkerns untergebracht und stützt sich in einer Mulde in der Stirnseite des Magnetankers ab. Durch mehr oder weniger tiefes Einschrauben des Einstellrohrs in den Magnetkern kann die Vorspannung der Rückstellfeder unabhängig vom Ventilnadelhub geändert und damit die dynamische Durchflußmenge des Kraftstoffeinspritzventils eingestellt werden.The return spring for the valve needle, which is designed as a cylindrical compression spring, is accommodated in the hollow cylindrical interior of the magnetic core and is supported in a recess in the end face of the magnet armature. By screwing the adjusting tube more or less deeply into the magnetic core, the pretension of the return spring can be changed independently of the valve needle stroke and thus the dynamic flow rate of the fuel injection valve can be adjusted.
Der ringförmige Hubanschlag für die Ventilnadel hat den Nachteil, daß bei nicht exakt fluchtender Ventilnadel die Anschlagfläche der Ringschulter am Anschlagring sich von ringförmig bis sichelförmig ändert, dadurch der Ventilnadelhub nicht dem eingestellten Hub entspricht und als Folge dessen die eingespritzte Kraftstoffmenge variiert. Um dies weitgehend zu vermeiden, trägt die Ventilnadel zwei im relativ großen Abstand voneinander angeordnete Führungsabschnitte mit größerem Durchmesser, die an der Innenwand des Ventilraums entlanggleiten. Um den axialen Kraftstoffdurchfluß zu ermöglichen, sind die Führungsabschnitte seitlich abgeflacht. Diese konstruktiven Maßnahmen erfordern nicht nur einen erhöhten Fertigungsaufwand, sondern setzen auch eine Mindestlänge des im Ventilraum befindlichen Ventilnadelabschnitts voraus, so daß eine gewisse axiale Baulänge des Kraftstoffeinspritzventils nicht unterschritten werden kann.The annular stroke stop for the valve needle has the disadvantage that if the valve needle is not exactly aligned, the stop surface of the annular shoulder on the stop ring changes from annular to crescent-shaped, as a result of which the valve needle stroke does not correspond to the set stroke and, as a result, the amount of fuel injected varies. In order to largely avoid this, the valve needle carries two relatively large-spaced guide sections with a larger diameter that slide along the inner wall of the valve chamber. In order to enable the axial flow of fuel, the guide sections are flattened laterally. These design measures not only require increased manufacturing effort, but also require a minimum length of the valve needle section located in the valve chamber, so that a certain axial overall length of the fuel injection valve cannot be undercut.
Das erfindungsgemäße Kraftstoffeinspritzventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, daß unter Beibehaltung der Einstellmöglichkeit für die Rückstellfeder der Ventilnadel ein zentraler Hubanschlag mit mittigem Anschlagpunkt realisiert ist, der in der Achse des Ventilgehäuses liegt. Die Anschlagfläche der Ventilnadel ist damit immer punkförmig, auch bei nicht exakt fluchtender Ventilnadel, so daß keine Hubänderung beim Öffnungshub der Ventilnadel entsteht. Die eingespritzte Kraftstoffmenge ist damit weitgehend konstant. Da der Ventilnadelhub weitgehend unempfindlich bezüglich der Abweichung der Ventilnadelachse von der Ventilgehäuseachse ist, benötigt die Ventilnadel auch keine zusätzlichen Führungen im Ventilraum, sondern kommt mit der Führung durch den Magnetanker und durch die Zentrierung im Ventilsitz aus. Der fertigungstechnische Aufwand für das Kraftstoffeinspritzventil sinkt damit nicht unbedeutend.The fuel injector according to the invention with the characterizing features of claim 1 has the advantage that a central stroke stop with a central stop point is realized while maintaining the adjustment option for the return spring of the valve needle, which in the axis of the Valve housing is. The stop surface of the valve needle is therefore always punctiform, even when the valve needle is not exactly aligned, so that there is no change in stroke during the opening stroke of the valve needle. The amount of fuel injected is therefore largely constant. Since the valve needle stroke is largely insensitive to the deviation of the valve needle axis from the valve housing axis, the valve needle also does not require any additional guides in the valve chamber, but rather requires guidance by the magnet armature and by centering in the valve seat. The manufacturing outlay for the fuel injector thus drops not insignificantly.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Kraftstoffeinspritzventils möglich.Advantageous further developments and improvements of the fuel injection valve specified in claim 1 are possible through the measures listed in the further claims.
Wird gemäß einer bevorzugten Ausführungsgform der Erfindung die im Magnetanker befestigte Ventilnadel mit ihrem von der Ventilöffnung abgekehrten Endabschnitt durch den Magnetanker hindurchgeführt, so daß sie beim Öffnungshub mit ihrem Stirnende unmittelbar am Quersteg anschlägt, so erreicht man, daß die weichmagnetischen Bauteile, wie der Magnetanker, keinen mechanischen Beanspruchungen durch den Hubanschlag ausgesetzt werden. Auf die gesonderte Behandlung der Oberfläche dieser Bauteile kann daher verzichtet werden. Die Ventilnadel hingegen muß aus anderen Gründen ohnehin gehärtet werden, so daß sie den mechanischen Belastungen beim Anschlag problemlos standhält.If, according to a preferred embodiment of the invention, the valve needle fastened in the magnet armature is passed through the magnet armature with its end section facing away from the valve opening, so that it hits the transverse web with its front end during the opening stroke, the result is that the soft magnetic components, such as the magnet armature, are not exposed to mechanical loads from the stroke stop. There is therefore no need to treat the surface of these components separately. The valve needle, on the other hand, has to be hardened anyway for other reasons, so that it can easily withstand the mechanical loads when struck.
Eine weitere fertigungstechnische Vereinfachung des erfindungsgemäßen Kraftstoffeinspritzventils wird dadurch erreicht, daß der Magnetanker eine zu dem Magnetkern hin offene koaxiale Sackbohrung aufweist, an deren Grund sich die den Ventilendabschnitt umgebende Rückstellfeder abstützt, wobei das geschlitzte Einstellrohr endseitig in die Sackbohrung hineinragt, und dadurch, daß der Magnetanker mit einem nahe dem offenen Ende der Sackbohrung ausgebildeten ringförmigen Führungsabschnitt auf dem Einstellrohr axial verschieblich geführt ist. Durch diese Maßnahmen wird in einfacher Weise eine Führung des Magnetankers erreicht, ohne daß ein zusätzlicher Führungsring im Magnetgehäuse vorgesehen werden muß.A further manufacturing simplification of the fuel injection valve according to the invention is achieved in that the magnet armature has a coaxial blind bore that is open towards the magnet core, at the bottom of which the return spring surrounding the valve end section is supported, the slotted adjusting tube ending in the blind hole protrudes, and in that the magnet armature is guided axially displaceably on the adjusting tube with an annular guide section formed near the open end of the blind hole. Through these measures, guidance of the magnet armature is achieved in a simple manner without an additional guide ring having to be provided in the magnet housing.
Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
- Fig. 1 einen Längsschnitt eines Kraftstoffeinspritzventils für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine,
- Fig. 2 eine vergrößerte Darstellung des Ausschnittes II in Fig. 1,
- Fig. 3 eine Schnitt längs der Linie III-III in Fig. 2.
- 1 shows a longitudinal section of a fuel injection valve for a fuel injection device of an internal combustion engine,
- 2 is an enlarged view of section II in Fig. 1,
- 3 shows a section along the line III-III in FIG. 2nd
Das in Fig. 1 im Längsschnitt dargestellte Kraftstoffeinspritzventil für eine Kraftstoffeinspritzvorrichtung einer Brennkraftmaschine wiest ein dreiteiliges Gehäuse 10 mit einem Oberteil 11, Mittelteil 12 und Unterteil 13 auf. Das hohlzylindrische, einen Ventilraum 14 enthaltende Unterteil 13 und das mit einem axialen Kraftstoffzulaufstutzen 15 versehene Oberteil 11 sind in das topfförmig ausgebildete Mittelteil 12 eingesetzt und durch Umbördelung gehalten. Der Ventilraum 14 ist nahe dem unteren Ende des Unterteils 13 von einer Ventilöffnung 16 begrenzt, die ihrerseits von einem Ventilsitz 17 umschlossen ist. Zum Freigeben und Verschließen der Ventilöffnung 16 arbeitet mit dem Ventilsitz 17 eine Ventilnadel 18 zusammen, die von einem Elektromagneten 20 betätigt wird. Zwischen der Stirnseite des Unterteils 13 und dem am Topfboden stutzenartig auslaufenden Mittelteils 12 ist ein Zwischenring 19 eingelegt. Das Oberteil 11 deckt mit einem Flansch 21 das Mittelteil 12 ab und ragt mit einem hohlzylindrischen stutzenartigen koaxialen Vorsprung 22 in das Innere des Mittelteils 12 hinein. Nach außen setzt sich der Vorsprung 22 einstückig in einen Rohrabschnitt fort, der den Kraftstoff-Zulaufstutzen 15 bildet.The fuel injection valve shown in longitudinal section in FIG. 1 for a fuel injection device of an internal combustion engine has a three-
Der Elektromagnet 20 besteht in bekannter Weise aus einem Magnetgehäuse, das hier unmittelbar von dem aus ferromagnetischem Material hergestellte topfförmigen Mittelteil 12 gebildet ist, aus einem koaxialen Magnetkern, der hier von dem Vorsprung 22 des ebenfalls aus ferromagnetischem Material hergestellten Oberteils 11 gebildet ist, aus einer den Magnetkern 22 umgebenden Magnetspule 23 und einen im Bodenbereich des Mittelteils 12 geführten, dem Magnetkern 22 stirnseitig gegenüberliegenden Magnetanker 24. Die elektrische Zuleitung zur Magnetspule 23 ist mit 37 bezeichnet.The
Der Magnetanker 24 weist eine koaxiale Stufenbohrung 25 auf. Der durchmesserkleinere Bohrungsabschnitt 251 umschließt fest die Ventilnadel 18, die sich mit einem im Durchmesser kleineren Endabschnitt durch den durchmessergrößeren Bohrungsabschnitt 252 hindurch erstreckt. An der am Übergang der Bohrungsabschnitte 251, 252 ausgebildeten Schulter 26 stützt sich eine als Druckfeder ausgebildete Rückstellfeder 27 ab, die mit ihrem anderen Ende an der ringförmigen Stirnseite eines im Innern des hohlzylindrischen Oberteils 11 axial verschieblichen Einstellrohrs 28 anliegt. Durch Axialverschiebung des Einstellrohrs 28 im Oberteil 11, was beispielsweise durch Verschraubung eines Außengewindeabschnitts 29 auf dem Einstellrohr 36 in einem Innengewindeabschnitt 30 im Oberteil 11 bewirkt werden kann, kann die Vorspannung der Rückstellfeder 27 eingestellt werden.The
Zur Begrenzung des Öffnungshubs der Ventilnadel 18, die mit einer kugelförmigen Schließfläche 31 auf dem Ventilsitz 17 aufliegt und durch Erregung der Magnetspule 23 von diesem abgehoben werden kann, ist ein Hubanschlag in Form eines Querstegs 32 im Innern des hohlzylindrischen Magnetkerns 22 befestigt. Hierzu ist das Einstellrohr 28 in dem der Rückstellfeder 27 zugekehrten Endbereich geschlitzt und übergreift mit diesem geschlitzten Endabschnitt den Quersteg 32 beidseitig mit Spiel, wie dies deutlicher in Fig. 3 zu sehen ist. Der Quersteg 32 trägt einen mittigen, d.h. in der Ventilgehäuseachse liegenden Anschlagpunkt 33, der von einer Auswölbung 34 auf der der Ventilnadel 18 zugekehrten Stirnfläche des Querstegs 32 gebildet ist. An diesem Anschlagpunkt 33 schlägt, beim Ventilnadelhub das stirnseitige Ende der Ventilnadel 18 an. Die Anordnung und Ausbildung von Magnetanker 24, Quersteg 32 und Ventilnadel 18 ist dabei so getroffen, daß beim Anliegen des Stirnendes der Ventilnadel 18 an dem Anschlagpunkt 33 auf dem Quersteg 32 zwischen den einander zugekehrten Stirnseite von Magnetanker 24 und Magnetkern 22 ein Restluftspalt 35 verbleibt, wie dies in der vergrößerten Darstellung in Fig. 2 zu erkennen ist. Der maximale Hub der Ventilnadel 18 ist durch die Strecke h in Fig. 2 gekennzeichnet. Der Quersteg 32 und das Einstellrohr 28 sind aus unmagnetischen Werkstoff hergestellt.In order to limit the opening stroke of the
Durch den zentralen Anschlagpunkt 33 das Querstegs 32 ist die Anschlagfläche der Ventilnadel am Quersteg 32 immer punktförmig, selbst dann, wenn die Ventilnadel 18 nicht exakt mit der Achse des Ventilgehäuses 10 fluchtet. Damit bleibt auch bei nicht exakt fluchtender Ventilnadel 18 der Ventilnadelhub konstant. Mit jedem Öffnen des Kraftstoffeinspritzventils wird somit die exakt gleiche Kraftstoffeinspritzmenge ausgespritzt.Due to the
Der hohlzylindrische Magnetanker 24 trägt am Ende einen radial nach innen vorspringenden ringförmigen Führungsabschnitt 36, der einstückig mit dem Magnetanker 24 ist. Mit diesem Führungsabschnitt 36 gleitet der Magnetanker 24 nahezu spiellos auf dem Einstellrohr 28, wodurch der Magnetanker 24 auch außerhalb des Bodenbereichs des Magnetgehäuses bzw. des Mittelteils 12 exakt geführt ist. Zusätzliche Führungsmittel für die Ventilnadel 18 können dadurch entfallen.The hollow
Claims (7)
- Fuel injection valve, for fuel injection devices of internal combustion engines, having a valve housing which has an axial fuel supply mouthpiece and, connected to this, a valve space which is bounded by a valve opening surrounded by a valve seat, having a valve needle interacting with the valve seat to open and close the valve opening, having an electromagnet which actuates the valve needle and has a magnet housing with coaxial, hollow cylindrical magnet core extending as far as the fuel supply mouthpiece, a magnet coil surrounding the magnet core and a magnet armature guided so as to be axially displaceable in the magnet housing and with its end opposite to the magnet core, the magnet armature being firmly connected to the valve needle, having a valve needle return spring which is supported on the magnet armature at one end and on the end of an adjustment tube, which is axially displaceable in the magnet core, at the other, and having a stroke stop for limiting the opening stroke of the valve needle, characterised in that the stroke stop is firmly located as a transverse bridge (32) with central contact point (33) inside the hollow cylindrical magnet core (22) and that the adjustment tube (28) is longitudinally slotted at its end section facing towards the return spring (27) and here passes with clearance over both sides of the transverse bridge (32).
- Valve according to Claim 1, characterised in that the end section, facing away from the valve opening (16), of the valve needle (18) fastened in the magnet armature (24) is led through the magnet armature (24) and its end comes into direct contact with the transverse bridge (32).
- Valve according to Claim 2, characterised in that the arrangement and design of the magnet armature (24), transverse bridge (32) and the end of the needle facing towards the latter are such that when the valve needle (18) is in contact with the contact point (33) of the transverse bridge (32), a residual air gap (35) remains between the mutually facing ends of the magnet armature (24) and the magnet core (22).
- Valve according to Claim 2 or 3, characterised in that the central contact point (33) of the transverse bridge (32) is formed by a bulge (34) on the end surface of the transverse bridge (32) facing towards the valve needle (18).
- Valve according to one of Claims 1 - 4, characterised in that the magnet armature (24) has a coaxial blind hole (252) open towards the magnet core (22) and the return spring (27) surrounding the end section of the valve needle is supported on the bottom of this blind hole (252), in that the end of the adjustment tube (28) protrudes into the blind hole (252) and in that an annular guide section (36) formed near the open end of the blind hole (252) on the magnet armature (24) is guided so that it can be axially displaced on the adjustment tube (28).
- Valve according to one of Claims 1 - 5, characterised in that the transverse bridge (32) and the adjustment tube (28) are manufactured from non-magnetic material.
- Valve according to one of Claims 1 - 6, characterised in that the magnet housing of the electromagnet (20) is formed by the valve housing (12).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3931604A DE3931604A1 (en) | 1989-09-22 | 1989-09-22 | FUEL INJECTION VALVE |
| DE3931604 | 1989-09-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0447502A1 EP0447502A1 (en) | 1991-09-25 |
| EP0447502B1 true EP0447502B1 (en) | 1992-12-23 |
Family
ID=6389942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90911533A Expired - Lifetime EP0447502B1 (en) | 1989-09-22 | 1990-08-16 | Fuel injection valve |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5131599A (en) |
| EP (1) | EP0447502B1 (en) |
| JP (1) | JPH04501905A (en) |
| KR (1) | KR920701657A (en) |
| BR (1) | BR9006921A (en) |
| DE (2) | DE3931604A1 (en) |
| HU (1) | HUT58864A (en) |
| WO (1) | WO1991004407A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2365494B (en) * | 1997-12-19 | 2002-05-15 | Caterpillar Inc | A solenoid assembly |
| US6508418B1 (en) * | 1998-05-27 | 2003-01-21 | Siemens Automotive Corporation | Contaminant tolerant compressed natural gas injector and method of directing gaseous fuel therethrough |
| US6431474B2 (en) | 1999-05-26 | 2002-08-13 | Siemens Automotive Corporation | Compressed natural gas fuel injector having magnetic pole face flux director |
| US6405947B2 (en) | 1999-08-10 | 2002-06-18 | Siemens Automotive Corporation | Gaseous fuel injector having low restriction seat for valve needle |
| US7669789B2 (en) * | 2007-08-29 | 2010-03-02 | Visteon Global Technologies, Inc. | Low pressure fuel injector nozzle |
| US20090057446A1 (en) * | 2007-08-29 | 2009-03-05 | Visteon Global Technologies, Inc. | Low pressure fuel injector nozzle |
| US20090090794A1 (en) * | 2007-10-04 | 2009-04-09 | Visteon Global Technologies, Inc. | Low pressure fuel injector |
| US20090200403A1 (en) * | 2008-02-08 | 2009-08-13 | David Ling-Shun Hung | Fuel injector |
| EP2333297B1 (en) * | 2009-12-11 | 2013-03-20 | Continental Automotive GmbH | Valve assembly for an injection valve and injection valve |
| CN105804910B (en) * | 2016-03-19 | 2018-08-07 | 上海大学 | A kind of highly sensitive fuel injection beginning of diesel engine sensor |
| US11603815B1 (en) | 2021-11-04 | 2023-03-14 | Standard Motor Products, Inc. | Modular armature-needle assembly for fuel injectors |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE104450C1 (en) * | ||||
| SE105805C1 (en) * | ||||
| US4232830A (en) * | 1978-11-01 | 1980-11-11 | The Bendix Corporation | Electromagnetic fuel injector |
| US4360161A (en) * | 1979-01-29 | 1982-11-23 | The Bendix Corporation | Electromagnetic fuel injector |
| US4887769A (en) * | 1987-06-26 | 1989-12-19 | Hitachi, Ltd. | Electromagnetic fuel injection valve |
-
1989
- 1989-09-22 DE DE3931604A patent/DE3931604A1/en not_active Withdrawn
-
1990
- 1990-08-16 EP EP90911533A patent/EP0447502B1/en not_active Expired - Lifetime
- 1990-08-16 HU HU906832A patent/HUT58864A/en unknown
- 1990-08-16 BR BR909006921A patent/BR9006921A/en unknown
- 1990-08-16 KR KR1019910700329A patent/KR920701657A/en not_active Application Discontinuation
- 1990-08-16 WO PCT/DE1990/000629 patent/WO1991004407A1/en active IP Right Grant
- 1990-08-16 JP JP2510810A patent/JPH04501905A/en active Pending
- 1990-08-16 DE DE9090911533T patent/DE59000662D1/en not_active Expired - Fee Related
- 1990-08-16 US US07/671,891 patent/US5131599A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04501905A (en) | 1992-04-02 |
| HUT58864A (en) | 1992-03-30 |
| BR9006921A (en) | 1991-11-26 |
| KR920701657A (en) | 1992-08-12 |
| DE59000662D1 (en) | 1993-02-04 |
| WO1991004407A1 (en) | 1991-04-04 |
| DE3931604A1 (en) | 1991-04-04 |
| EP0447502A1 (en) | 1991-09-25 |
| HU906832D0 (en) | 1991-09-30 |
| US5131599A (en) | 1992-07-21 |
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