EP0300198A1 - Fuel injection nozzle for internal-combustion engines - Google Patents

Fuel injection nozzle for internal-combustion engines Download PDF

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Publication number
EP0300198A1
EP0300198A1 EP88109606A EP88109606A EP0300198A1 EP 0300198 A1 EP0300198 A1 EP 0300198A1 EP 88109606 A EP88109606 A EP 88109606A EP 88109606 A EP88109606 A EP 88109606A EP 0300198 A1 EP0300198 A1 EP 0300198A1
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EP
European Patent Office
Prior art keywords
valve needle
armature
injection nozzle
nozzle
needle
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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Application number
EP88109606A
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German (de)
French (fr)
Inventor
Karl Ing.-Grad. Hoffmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP0300198A1 publication Critical patent/EP0300198A1/en
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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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to a fuel injector for internal combustion engines according to the preamble of the main claim.
  • Injection nozzles of this type have the advantage that the absence of a residual air gap means that a more pronounced signal can be achieved than in those designs in which a residual air gap caused by manufacturing tolerances must be accepted due to the lack of an elastic spring element. It is particularly advantageous that the initial air gap can already be kept very small, so that the armature strikes the magnetic core when the valve needle has, for example, only completed a quarter or an eighth of its total opening stroke. This ensures that the signaling that is compressed for the shortest possible time actually takes place at the beginning of the opening stroke and at the end of the closing stroke of the valve needle.
  • the spring element which is elastically compressible in the nozzle axis direction acts on the displaceably mounted magnetic core and is accommodated in a chamber of the nozzle holder, which is between the induction coil and the connection-side end face of the Nozzle holder is arranged.
  • the above-described advantage of improved signaling is bought by an increased space requirement in the axial direction of the injection nozzle, which is particularly important when the electrical connection contacts of the induction coil are also arranged axially and the signal lines leading there are guided in approximately the same direction out of the nozzle holder should be.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that a space between the induction coil and the connection-side end face of the nozzle holder is not required for the elastically compressible spring element, so that the nozzle holder is either dimensioned shorter in the axial direction or the space not required can be used to accommodate the connection elements of the induction coil.
  • FIG. 1 shows a longitudinal section through the exemplary embodiment
  • FIG. 2 shows an enlarged variant of the injection nozzle according to FIG. 1.
  • the injection nozzle has a nozzle holder 10, against which an intermediate plate 11 and a nozzle body 12 are clamped by a union nut 13.
  • a guide bore 14 for receiving a valve needle 15 and a valve seat 16 are formed, which cooperates with a sealing cone 17 on the valve needle 15.
  • a needle shaft 18 Connected to the sealing cone 17 is a needle shaft 18, which is larger in diameter and slides in the guide bore 14, and a pressure pin 19.
  • On the pressure pin 19 sits a pressure piece 20, which engages around the pressure pin 19 with the required movement play with a ring collar pointing downward.
  • the annular shoulder 21 formed between the needle shaft 18 and the pressure pin 19 on the valve needle 15 is removed from the intermediate plate 11 by the dimension h when the valve needle 15 is seated on the valve seat 16, which corresponds to the total stroke of the valve needle 15 delimited by the intermediate plate 11.
  • an open end space 22 with a shoulder 23 and a smaller diameter blind bore 24 are recessed.
  • An induction coil 26 provided with a magnetically conductive housing 25, a plate 27 and a closing spring 28 for the valve needle 15 are inserted into the spring chamber 22.
  • the closing spring 28 engages on the pressure piece 20 and is supported on the shoulder 23 of the nozzle holder 10 via the plate 27, the housing 25 and an annular flange 29 of a magnetic core 30 passing through the induction coil 26.
  • the induction coil 26 is simultaneously held securely on the shoulder 23 and the plate 27 pressed against the open end edge of the housing 25.
  • the housing 25 and the magnetic core 30 together with the ring flange 29 are made of soft iron and form sections of a magnetic circuit which also leads via an armature 32 also made of soft iron and an air gap formed between the latter and the magnetic core 30 in the closed position of the valve needle 15.
  • the armature 32 is guided in an exactly displaceable manner in the housing 25 and is coupled to the valve needle 15 via a driving pin 33 which is firmly connected to the pressure piece 20. With its upper front end, the driving pin 33 provided there with an annular collar 34 plunges into a chamber 35 of the armature 32, the inlet opening of which is provided with a collar 36 which engages under the annular collar 34.
  • a helical compression spring 38 is arranged, which is supported on the pressure piece 20 and acts on the collar 36 of the armature 32. In the closed position of the valve needle 15, the helical compression spring 38 presses the collar 36 against the annular collar 34 of the driver bolt 33.
  • the initial air gap between the armature 32 and the magnetic core 33 is dimensioned much smaller than the opening stroke of the valve needle 15.
  • the depth of the chamber 35 in the armature 32 is dimensioned such that the axial play of the collar 34 in the chamber 32 is greater than the difference between the Opening stroke of the valve needle 15 and the initial air gap between armature 32 and magnetic core 30 is.
  • the fuel supplied passes through bores 40 and 41 in the nozzle holder 10 into an end annular groove 42 of the intermediate plate 11 and from there further via a bore 43 in the intermediate plate 11, an annular groove 44 and a bore 45 in the nozzle body 12 into a pressure chamber 46, which the Valve needle 15 in the region of a pressure shoulder 47 gives. From the pressure chamber 46, the fuel passes through the valve 16, 17 into a spray opening 48 and from there into the combustion chamber of the engine.
  • the amount of leakage oil reaching the spring chamber 22 via the guide gap of the valve needle 15 can be discharged via a leakage oil channel, not shown in the drawing, into a connection stub, likewise not visible, for an external leakage oil line.
  • the induction coil 26 is connected via connecting means 49 and a connecting cable 50 to a direct current source and a device for evaluating the voltages induced in operation in the induction coil and superimposed on an applied direct voltage.
  • a direct current source and a device for evaluating the voltages induced in operation in the induction coil and superimposed on an applied direct voltage.
  • the initial air gap is shortened to the value 0, so that there is a clearly pronounced sudden change in the magnetic flux and the resulting voltage at exactly the right time.
  • collar 34 moves upward in chamber 35 of armature 32, helical compression spring 38 being correspondingly axially compressed.
  • the armature 32 initially remains in contact with the magnetic core 30 by means of the helical compression spring 38 until the collar 34 is placed on the collar 36 and then pulls the armature 32 back into the starting position.
  • the evaluation circuit is again supplied with a distinct signal.
  • a spring element 52 which is elastically compressible in the nozzle axis direction is arranged in the chamber 35 of the armature 32, so that a helical compression spring surrounding the driving pin 33 is omitted.

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

Abstract

The resonator involves a rotationally symmetric body (21) pref. of Cr-Ni steel with a disc-shaped base (22) and a working plate (26), joined by a relatively narrow neck (25). It is vibrated by a plane symmetrical piezoceramic ultrasonic thickness-mode vibrator 827) coupled to the under surface of the disc (22), whose upper surface (24) is a paraboloid of revolution about the axis (30) of symmetry. The centre of the working plate (26) lies in the vicinity of the focus (F3) of the paraboloid (24). Ultrasonic waves excited by the vibrator (27) are focussed in the region of the working plate (26), where the liq, is broken up into very fine droplets.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoff-Einspritzdüse für Brenn­kraftmaschinen nach der Gattung des Hauptanspruchs. Einspritzdüsen dieser Gattung haben den Vorteil, daß durch das Fehlen eines Rest­luftspaltes ein deutlicher ausgeprägtes Signal erzielbar ist als bei jenen Ausführungen, bei denen wegen Fehlens eines elastischen Feder­elementes ein durch Fertigungstoleranzen bedingter Restluftspalt in Kauf genommen werden muß. Besonders vorteilhaft ist es, daß bereits der Anfangsluftspalt sehr klein gehalten werden kann, so daß der Anker schon dann an den Magnetkern anschlägt, wenn die Ventilnadel beispielsweise erst ein Viertel oder ein Achtel ihres gesamten Öffnungshubes zurückgelegt hat. Dadurch ist sichergestellt, daß die auf kürzeste Zeit zusammengedrängte Signalgabe tatsächlich am Anfang des Öffnungshubes und am Ende des Schließhubes der Ventilnadel er­folgt.The invention relates to a fuel injector for internal combustion engines according to the preamble of the main claim. Injection nozzles of this type have the advantage that the absence of a residual air gap means that a more pronounced signal can be achieved than in those designs in which a residual air gap caused by manufacturing tolerances must be accepted due to the lack of an elastic spring element. It is particularly advantageous that the initial air gap can already be kept very small, so that the armature strikes the magnetic core when the valve needle has, for example, only completed a quarter or an eighth of its total opening stroke. This ensures that the signaling that is compressed for the shortest possible time actually takes place at the beginning of the opening stroke and at the end of the closing stroke of the valve needle.

Bei einer bekannten Einspritzdüse der eingangs genannten Gattung (DE-A1 31 37 761) wirkt das in Düsenachsrichtung elastisch zusammen­drückbare Federelement auf den verschiebbar gelagerten Magnetkern ein und ist in einer Kammer des Düsenhalters untergebracht, welche zwischen der Induktionsspule und dem anschlußseitigen Stirnende des Düsenhalters angeordnet ist. Bei dieser Ausführung wird der eingangs geschilderte Vorteil einer verbesserten Signalgabe durch einen er­höhten Platzbedarf in Achsrichtung der Einspritzdüse erkauft, was insbesondere dann von Bedeutung ist, wenn die elektrischen Anschluß­kontakte der Induktionsspule ebenfalls axial angeordnet und die da­hin führenden Signalleitungen annähernd in gleicher Richtung aus dem Düsenhalter herausgeführt sein sollen.In a known injection nozzle of the type mentioned (DE-A1 31 37 761), the spring element which is elastically compressible in the nozzle axis direction acts on the displaceably mounted magnetic core and is accommodated in a chamber of the nozzle holder, which is between the induction coil and the connection-side end face of the Nozzle holder is arranged. In this embodiment, the above-described advantage of improved signaling is bought by an increased space requirement in the axial direction of the injection nozzle, which is particularly important when the electrical connection contacts of the induction coil are also arranged axially and the signal lines leading there are guided in approximately the same direction out of the nozzle holder should be.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß für das elastisch zusammendrückbare Federelement ein zwischen der Induktionsspule und dem anschlußseitigen Stirnende des Düsenhalters liegender Raum nicht benötigt wird, so daß der Düsenhalter entweder in Achsrichtung kürzer bemessen oder der nicht benötigte Raum für die Unterbringung der Anschlußelemente der Induktionsspule genutzt werden kann. Durch den Wegfall einer starren Verbindung zwischen der Ventilnadel bzw. einem Druckstück und dem Anker ist ferner erreicht, daß das Führungsspiel des Ankers in einem Rückschlußteil des magnetischen Kreises der Induktionsspule kleiner als bisher bemessen werden kann, was sich ebenfalls positiv auf die Signalbildung auswirkt.The arrangement according to the invention with the characterizing features of the main claim has the advantage that a space between the induction coil and the connection-side end face of the nozzle holder is not required for the elastically compressible spring element, so that the nozzle holder is either dimensioned shorter in the axial direction or the space not required can be used to accommodate the connection elements of the induction coil. By eliminating a rigid connection between the valve needle or a pressure piece and the armature it is also achieved that the guide play of the armature in a back yoke part of the magnetic circuit of the induction coil can be dimensioned smaller than before, which also has a positive effect on the signal formation.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vor­teilhafte Weiterbildungen der Anordnung nach dem Hauptanspruch mög­lich.Advantageous further developments of the arrangement according to the main claim are possible through the measures listed in the subclaims.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung darge­stellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Längsschnitt durch das Ausführungsbeispiel und Figur 2 vergrößert eine Variante der Einspritzdüse nach Figur 1.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. It FIG. 1 shows a longitudinal section through the exemplary embodiment and FIG. 2 shows an enlarged variant of the injection nozzle according to FIG. 1.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Einspritzdüse nach dem Ausführungsbeispiel hat einen Düsenhalter 10, gegen den eine Zwischenplatte 11 und ein Düsenkörper 12 durch eine Überwurfmutter 13 gespannt sind. Im Düsenkörper 12 sind eine Führungsbohrung 14 zur Aufnahme einer Ventilnadel 15 und ein Ventil­sitz 16 gebildet, der mit einem Dichtkegel 17 an der Ventilnadel 15 zusammenwirkt. An den Dichtkegel 17 schließt sich ein im Durchmesser größerer, in der Führungsbohrung 14 gleitender Nadelschaft 18 und ein Druckzapfen 19 an. Auf dem Druckzapfen 19 sitzt ein Druckstück 20 auf, welches mit einem nach unten weisenden Ringkragen den Druck­zapfen 19 mit dem erforderlichen Bewegungsspiel umgreift. Die zwischen Nadelschaft 18 und Druckzapfen 19 an der Ventilnadel 15 ge­bildete Ringschulter 21 ist bei auf dem Ventilsitz 16 aufsitzender Ventilnadel 15 um das Maß h von der Zwischenplatte 11 entfernt, welches dem von der Zwischenplatte 11 begrenzten Gesamthub der Ven­tilnadel 15 entspricht.The injection nozzle according to the exemplary embodiment has a nozzle holder 10, against which an intermediate plate 11 and a nozzle body 12 are clamped by a union nut 13. In the nozzle body 12, a guide bore 14 for receiving a valve needle 15 and a valve seat 16 are formed, which cooperates with a sealing cone 17 on the valve needle 15. Connected to the sealing cone 17 is a needle shaft 18, which is larger in diameter and slides in the guide bore 14, and a pressure pin 19. On the pressure pin 19 sits a pressure piece 20, which engages around the pressure pin 19 with the required movement play with a ring collar pointing downward. The annular shoulder 21 formed between the needle shaft 18 and the pressure pin 19 on the valve needle 15 is removed from the intermediate plate 11 by the dimension h when the valve needle 15 is seated on the valve seat 16, which corresponds to the total stroke of the valve needle 15 delimited by the intermediate plate 11.

Im Düsenhalter 10 sind ein stirnseitig offener Federraum 22 mit einer Schulter 23 und eine im Durchmesser kleinere Sackbohrung 24 ausgespart. In den Federraum 22 sind eine mit einem magnetisch lei­tenden Gehäuse 25 versehene Induktionsspule 26, eine Platte 27 und eine Schließfeder 28 für die Ventilnadel 15 eingesetzt. Die Schließ­feder 28 greift am Druckstück 20 an und stützt sich über die Platte 27, das Gehäuse 25 und einen Ringflansch 29 eines die Induktions­spule 26 durchsetzenden Magnetkerns 30 an der Schulter 23 des Düsen­halters 10 ab. Dadurch wird gleichzeitig die Induktionsspule 26 schüttelsicher an der Schulter 23 festgehalten und die Platte 27 an den offenen Stirnrand des Gehäuses 25 angedrückt.In the nozzle holder 10, an open end space 22 with a shoulder 23 and a smaller diameter blind bore 24 are recessed. An induction coil 26 provided with a magnetically conductive housing 25, a plate 27 and a closing spring 28 for the valve needle 15 are inserted into the spring chamber 22. The closing spring 28 engages on the pressure piece 20 and is supported on the shoulder 23 of the nozzle holder 10 via the plate 27, the housing 25 and an annular flange 29 of a magnetic core 30 passing through the induction coil 26. As a result, the induction coil 26 is simultaneously held securely on the shoulder 23 and the plate 27 pressed against the open end edge of the housing 25.

Das Gehäuse 25 und der Magnetkern 30 samt Ringflansch 29 bestehen aus Weicheisen und bilden Abschnitte eines magnetischen Kreises, welcher auch über einen ebenfalls aus Weicheisen bestehenden Anker 32 und einen zwischen diesem und dem Magnetkern 30 in Schließ­stellung der Ventilnadel 15 gebildeten Luftspalt führt. Der Anker 32 ist im Gehäuse 25 exakt verschiebbar geführt und mit der Ventilnadel 15 über einen Mitnehmerbolzen 33 gekoppelt, der fest mit dem Druck­stück 20 verbunden ist. Mit seinem oberen Stirnende taucht der dort mit einem Ringbund 34 versehene Mitnehmerbolzen 33 in eine Kammer 35 des Ankers 32 ein, deren Eingangsöffnung mit einem den Ringbund 34 untergreifenden Kragen 36 versehen ist. In dem zwischen Mitnehmer­bolzen 33 und Schließfeder 28 gebildeten Ringraum ist eine Schrau­bendruckfeder 38 angeordnet, die sich am Druckstück 20 abstützt und am Kragen 36 des Ankers 32 angreift. In Schließstellung der Ventil­nadel 15 drückt die Schraubendruckfeder 38 den Kragen 36 an den Ringbund 34 des Mitnehmerbolzens 33 an.The housing 25 and the magnetic core 30 together with the ring flange 29 are made of soft iron and form sections of a magnetic circuit which also leads via an armature 32 also made of soft iron and an air gap formed between the latter and the magnetic core 30 in the closed position of the valve needle 15. The armature 32 is guided in an exactly displaceable manner in the housing 25 and is coupled to the valve needle 15 via a driving pin 33 which is firmly connected to the pressure piece 20. With its upper front end, the driving pin 33 provided there with an annular collar 34 plunges into a chamber 35 of the armature 32, the inlet opening of which is provided with a collar 36 which engages under the annular collar 34. In the annular space formed between the driving pin 33 and the closing spring 28, a helical compression spring 38 is arranged, which is supported on the pressure piece 20 and acts on the collar 36 of the armature 32. In the closed position of the valve needle 15, the helical compression spring 38 presses the collar 36 against the annular collar 34 of the driver bolt 33.

Der Anfangsluftspalt zwischen dem Anker 32 und dem Magnetkern 33 ist wesentlich kleiner bemessen als der Öffnungshub der Ventilnadel 15. Die Tiefe der Kammer 35 im Anker 32 ist so bemessen, daß das axiale Bewegungsspiel des Ringbundes 34 in der Kammer 32 größer als die Differenz zwischen dem Öffnungshub der Ventilnadel 15 und dem An­fangsluftspalt zwischen Anker 32 und Magnetkern 30 ist.The initial air gap between the armature 32 and the magnetic core 33 is dimensioned much smaller than the opening stroke of the valve needle 15. The depth of the chamber 35 in the armature 32 is dimensioned such that the axial play of the collar 34 in the chamber 32 is greater than the difference between the Opening stroke of the valve needle 15 and the initial air gap between armature 32 and magnetic core 30 is.

Der zugeführte Kraftstoff gelangt über Bohrungen 40 und 41 im Düsen­halter 10 in eine stirnseitige Ringnut 42 der Zwischenplatte 11 und von dort weiter über eine Bohrung 43 in der Zwischenplatte 11, eine Ringnut 44 und eine Bohrung 45 im Düsenkörper 12 in einen Druckraum 46, welcher die Ventilnadel 15 im Bereich einer Druckschulter 47 um­ gibt. Vom Druckraum 46 gelangt der Kraftstoff durch das Ventil 16, 17 in eine Spritzöffnung 48 und von dort in die Brennkammer des Motors. Die über den Führungsspalt der Ventilnadel 15 in den Feder­raum 22 gelangende Leckölmenge kann über einen in der Zeichnung nicht dargestellten Leckölkanal in einen ebenfalls nicht sichtbaren Anschlußstutzen für eine externe Leckölleitung abgeführt werden.The fuel supplied passes through bores 40 and 41 in the nozzle holder 10 into an end annular groove 42 of the intermediate plate 11 and from there further via a bore 43 in the intermediate plate 11, an annular groove 44 and a bore 45 in the nozzle body 12 into a pressure chamber 46, which the Valve needle 15 in the region of a pressure shoulder 47 gives. From the pressure chamber 46, the fuel passes through the valve 16, 17 into a spray opening 48 and from there into the combustion chamber of the engine. The amount of leakage oil reaching the spring chamber 22 via the guide gap of the valve needle 15 can be discharged via a leakage oil channel, not shown in the drawing, into a connection stub, likewise not visible, for an external leakage oil line.

Die Induktionsspule 26 ist über Anschlußmittel 49 und ein Anschluß­kabel 50 an eine Gleichstromquelle und eine Einrichtung zur Aus­wertung der im Betrieb in der Induktionsspule induzierten und sich einer angelegten Gleichspannung überlagernden Spannungen ange­schlossen. Unmittelbar nach Beginn des Öffnungshubes wird der An­fangsluftspalt auf den Wert 0 verkürzt, so daß sich genau zur richtigen Zeit eine deutlich ausgeprägte sprunghafte Änderung des magnetischen Flusses und der resultierenden Spannung ergibt. Beim weiteren Hub der Ventilnadel 15 verschiebt sich der Ringbund 34 in der Kammer 35 des Ankers 32 nach oben, wobei die Schraubendruckfeder 38 entsprechend axial zusammengedrückt wird. Beim Schließhub bleibt der Anker 32 durch die Schraubendruckfeder 38 zunächst am Magnetkern 30 angelegt, bis der Ringbund 34 auf den Kragen 36 aufsetzt und da­nach den Anker 32 schleppend in die Ausgangsstellung zurückzieht. Beim Abheben des Ankers 32 vom Magnetkern 30 wird der Auswerte­schaltung wiederum ein deutlich ausgeprägtes Signal zugeführt.The induction coil 26 is connected via connecting means 49 and a connecting cable 50 to a direct current source and a device for evaluating the voltages induced in operation in the induction coil and superimposed on an applied direct voltage. Immediately after the opening stroke begins, the initial air gap is shortened to the value 0, so that there is a clearly pronounced sudden change in the magnetic flux and the resulting voltage at exactly the right time. As valve needle 15 moves further, collar 34 moves upward in chamber 35 of armature 32, helical compression spring 38 being correspondingly axially compressed. During the closing stroke, the armature 32 initially remains in contact with the magnetic core 30 by means of the helical compression spring 38 until the collar 34 is placed on the collar 36 and then pulls the armature 32 back into the starting position. When the armature 32 is lifted from the magnetic core 30, the evaluation circuit is again supplied with a distinct signal.

Bei der Variante nach Figur 2 ist ein in Düsenachsrichtung elastisch zusammendrückbares Federelement 52 in der Kammer 35 des Ankers 32 angeordnet, so daß eine den Mitnehmerbolzen 33 umgebende Schrauben­druckfeder entfällt.In the variant according to FIG. 2, a spring element 52 which is elastically compressible in the nozzle axis direction is arranged in the chamber 35 of the armature 32, so that a helical compression spring surrounding the driving pin 33 is omitted.

Claims (5)

1. Kraftstoff-Einspritzdüse für Brennkraftmaschinen, mit einem Düsenkörper, in welchem ein Ventilsitz gebildet und eine Ventilnadel verschiebbar gelagert ist, die von einer Schließfeder und entgegen­gesetzt dazu vom Kraftstoffdruck beaufschlagt ist und sich beim Öffnungshub entgegen der Strömungsrichtung des Kraftstoffs bewegt, und ferner mit einem Düsenhalter, an welchem der Düsenkörper festge­spannt ist und der eine Kammer zur Aufnahme der Schließfeder und einer der nadel- bzw. nadelgeschwindigkeitsabhängigen Signalgabe dienenden Induktionsspule hat, die mit einem ihre zentrale Öffnung mindestens teilweise ausfüllenden Spulenkern versehen ist, gegen den sich ein von der Ventilnadel beeinflußter Anker beim Öffnungshub be­wegt, wobei der Anfangsluftspalt auf den Ventilnadelhub so abge­stimmt ist, daß spätestens am Hubende der Ventilnadel der Anker am Magnetkern zur Anlage kommt und wobei ein in Düsenachsrichtung elastisch verformbares Federelement einen die Größe des Anfangs­luftspaltes überschreitenden Überhub des Ankers aufnimmt, dadurch gekennzeichnet, daß das in Düsenachsrichtung elastisch verformbare Federelement (38, 52) zwischen der Ventilnadel (15) und dem Anker (32) angeordnet und dieser mit der Ventilnadel (15) über eine spiel­behaftete Schleppverbindung (34, 36) gekoppelt ist.1. Fuel injection nozzle for internal combustion engines, with a nozzle body, in which a valve seat is formed and a valve needle is slidably mounted, which is acted upon by a closing spring and opposite thereto by the fuel pressure and moves against the flow direction of the fuel during the opening stroke, and further with a Nozzle holder on which the nozzle body is clamped and which has a chamber for receiving the closing spring and an induction coil serving for needle or needle speed-dependent signaling, which is provided with a coil core which at least partially fills its central opening, against which a valve needle influences The armature moves during the opening stroke, the initial air gap being matched to the valve needle stroke in such a way that the armature comes into contact with the magnetic core at the latest at the stroke end of the valve needle, and a spring element which is elastically deformable in the direction of the nozzle axis has a size of A absorbs overtravel of the armature exceeding the initial air gap, characterized in that the spring element (38, 52) which is elastically deformable in the nozzle axis direction is arranged between the valve needle (15) and the armature (32) and this with the valve needle (15) via a playful drag connection (34, 36) is coupled. 2. Einspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß die Schleppverbindung (34, 36) zwischen Ventilnadel (15) und Anker (32) gebildet ist an einer axialen Schulter (36) am Anker (32) und einer diese Schulter (36) übergreifenden Gegenschulter (34) an einem sich durch die Schließfeder (28) der Ventilnadel (15) hindurch er­streckenden, mit der Ventilnadel (15) hin- und herbewegten Mit­nehmerbolzen (33).2. Injection nozzle according to claim 1, characterized in that the towing connection (34, 36) between the valve needle (15) and armature (32) is formed on an axial shoulder (36) on the armature (32) and this shoulder (36) overlapping Counter shoulder (34) on a driving pin (33) which extends through the closing spring (28) of the valve needle (15) and is moved back and forth with the valve needle (15). 3. Einspritzdüse nach Anspruch 2, dadurch gekennzeichnet, daß der Mitnehmerbolzen (33) mit einem Ringbund (34) in eine Kammer (35) im Anker (32) ragt, deren Eingangsöffnung von einem den Ringbund (34) untergreifenden Kragen (36) umgeben ist.3. Injection nozzle according to claim 2, characterized in that the driving pin (33) with an annular collar (34) protrudes into a chamber (35) in the armature (32), the inlet opening of which surrounds a collar (36) engaging under the annular collar (34) is. 4. Einspritzdüse nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß das in Düsenachsrichtung elastisch verformbare Federelement eine den Mitnehmerbolzen (33) umgebende, sich einerseits an der Ventilnadel (15) bzw. einen zur Schließdruckübertragung dienenden Druckstück (20) und andererseits an der der Ventilnadel (15) zugekehrten Stirn­seite des Ankers (32) abstützende Schraubendruckfeder (38) ist.4. Injection nozzle according to claim 2 or 3, characterized in that the spring element which is elastically deformable in the nozzle axis direction surrounds the driving pin (33), on the one hand on the valve needle (15) or a pressure piece (20) serving for closing pressure transmission, and on the other hand on the Valve needle (15) facing end of the armature (32) supporting helical compression spring (38). 5. Einspritzdüse nach Anspruch 3, dadurch gekennzeichnet, daß das in Düsenachsrichtung elastisch verformbare Federelement (52) in der Kammer (35) des Ankers (32) angeordnet ist.5. Injection nozzle according to claim 3, characterized in that the elastically deformable in the nozzle axis direction spring element (52) in the chamber (35) of the armature (32) is arranged.
EP88109606A 1987-07-24 1988-06-16 Fuel injection nozzle for internal-combustion engines Withdrawn EP0300198A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873724545 DE3724545A1 (en) 1987-07-24 1987-07-24 FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3724545 1987-07-24

Publications (1)

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EP0300198A1 true EP0300198A1 (en) 1989-01-25

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ID=6332287

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EP88109606A Withdrawn EP0300198A1 (en) 1987-07-24 1988-06-16 Fuel injection nozzle for internal-combustion engines

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EP (1) EP0300198A1 (en)
JP (1) JPS6436975A (en)
KR (1) KR890002535A (en)
DE (1) DE3724545A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006439A1 (en) * 1988-11-30 1990-06-14 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
US5801106A (en) * 1996-05-10 1998-09-01 Kimberly-Clark Worldwide, Inc. Polymeric strands with high surface area or altered surface properties
US5803106A (en) * 1995-12-21 1998-09-08 Kimberly-Clark Worldwide, Inc. Ultrasonic apparatus and method for increasing the flow rate of a liquid through an orifice
US5868153A (en) * 1995-12-21 1999-02-09 Kimberly-Clark Worldwide, Inc. Ultrasonic liquid flow control apparatus and method
US6020277A (en) * 1994-06-23 2000-02-01 Kimberly-Clark Corporation Polymeric strands with enhanced tensile strength, nonwoven webs including such strands, and methods for making same
US6053424A (en) * 1995-12-21 2000-04-25 Kimberly-Clark Worldwide, Inc. Apparatus and method for ultrasonically producing a spray of liquid
US6380264B1 (en) 1994-06-23 2002-04-30 Kimberly-Clark Corporation Apparatus and method for emulsifying a pressurized multi-component liquid
US6395216B1 (en) 1994-06-23 2002-05-28 Kimberly-Clark Worldwide, Inc. Method and apparatus for ultrasonically assisted melt extrusion of fibers
US6450417B1 (en) 1995-12-21 2002-09-17 Kimberly-Clark Worldwide Inc. Ultrasonic liquid fuel injection apparatus and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2097859A (en) * 1981-05-06 1982-11-10 Bosch Gmbh Robert A fuel injection nozzle for combustion engines
DE3137761A1 (en) * 1981-09-23 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2097859A (en) * 1981-05-06 1982-11-10 Bosch Gmbh Robert A fuel injection nozzle for combustion engines
DE3137761A1 (en) * 1981-09-23 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006439A1 (en) * 1988-11-30 1990-06-14 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
US5161742A (en) * 1988-11-30 1992-11-10 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
US6020277A (en) * 1994-06-23 2000-02-01 Kimberly-Clark Corporation Polymeric strands with enhanced tensile strength, nonwoven webs including such strands, and methods for making same
US6380264B1 (en) 1994-06-23 2002-04-30 Kimberly-Clark Corporation Apparatus and method for emulsifying a pressurized multi-component liquid
US6395216B1 (en) 1994-06-23 2002-05-28 Kimberly-Clark Worldwide, Inc. Method and apparatus for ultrasonically assisted melt extrusion of fibers
US5803106A (en) * 1995-12-21 1998-09-08 Kimberly-Clark Worldwide, Inc. Ultrasonic apparatus and method for increasing the flow rate of a liquid through an orifice
US5868153A (en) * 1995-12-21 1999-02-09 Kimberly-Clark Worldwide, Inc. Ultrasonic liquid flow control apparatus and method
US6053424A (en) * 1995-12-21 2000-04-25 Kimberly-Clark Worldwide, Inc. Apparatus and method for ultrasonically producing a spray of liquid
US6450417B1 (en) 1995-12-21 2002-09-17 Kimberly-Clark Worldwide Inc. Ultrasonic liquid fuel injection apparatus and method
US6659365B2 (en) 1995-12-21 2003-12-09 Kimberly-Clark Worldwide, Inc. Ultrasonic liquid fuel injection apparatus and method
US5801106A (en) * 1996-05-10 1998-09-01 Kimberly-Clark Worldwide, Inc. Polymeric strands with high surface area or altered surface properties

Also Published As

Publication number Publication date
DE3724545A1 (en) 1989-02-02
JPS6436975A (en) 1989-02-07
KR890002535A (en) 1989-04-10

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