EP0828936B1 - Injection valve - Google Patents

Injection valve Download PDF

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Publication number
EP0828936B1
EP0828936B1 EP96914853A EP96914853A EP0828936B1 EP 0828936 B1 EP0828936 B1 EP 0828936B1 EP 96914853 A EP96914853 A EP 96914853A EP 96914853 A EP96914853 A EP 96914853A EP 0828936 B1 EP0828936 B1 EP 0828936B1
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EP
European Patent Office
Prior art keywords
nozzle needle
injection valve
accordance
tappet
piston
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
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EP96914853A
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German (de)
French (fr)
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EP0828936A1 (en
Inventor
Wendelin KLÜGL
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Siemens AG
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Siemens AG
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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
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/06—Other fuel injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions

Definitions

  • the invention relates to an injection valve according to the preamble of claim 1.
  • Such an injection valve is, for example, by EP-A 0 531 533 known.
  • This publication deals with one Diesel injection device with a high-pressure system (common rail system), where the fuel is a high pressure accumulator is fed via a high pressure pump. This one under high Pressurized fuel is then controlled the individual cylinders of a diesel engine via injectors fed. The injectors each controlled by a solenoid valve, for example also enable individual injection times.
  • the injectors are said to improve noise, etc. can be switched quickly at high injection pressures.
  • high storage pressures when using a solenoid valve a pre-injection difficult because the switching times of the Solenoid valve are too long and the full stroke of the valve must be run through so that reproducible conditions, for example the injection quantity can be achieved.
  • the formation of the injection rate i.e. slow opening, however, quickest closing of the nozzle needle, the shaping the injection rate according to a map can hardly be possible.
  • a piezoelectrically actuated injection valve is known from US-A-5 335 861.
  • the illustration shows an injection valve in section.
  • the injector shown in the figure consists of an elongated housing 5, one on its lower end Union nut 3 is screwed on. With this cap nut 3 is an intermediate washer from the lower end of the housing 5 4 and a nozzle body 1, in which a nozzle needle 2 is kept. The washer 4 and the nozzle body 1 have a center hole in which the nozzle needle 2 is guided displaceably in the axial direction.
  • a stepped plunger 7 is guided in the axial direction abuts the nozzle needle 2 at one end and at the other end with a secondary piston 14 of the piezoelectric drive device connected is.
  • a first pressure chamber 8 is provided, which an inlet bore 9 with a fuel inlet connection 10 connected is.
  • This high pressure inlet port 10 is also via an inlet bore 6 with a second pressure chamber 11 connected, in whose area the nozzle needle 2 is stepped, whereby a control surface for controlling the nozzle needle 2 is formed.
  • the tappet 7 has a secondary piston 14 in connection, which is guided in a primary piston is.
  • a piezo actuator 20 acts on the primary piston is stored in a closure 21 and opposite the actuator housing 12 is sealed by means of an O-ring 22.
  • the closure 21 is in the axial direction by means of a locking ring 24 secured. Electrical connections 23 are for Actuator 20 out.
  • the piezo actuator 20 acts on the primary piston 19 Disc spring 13. Next is in the recess of the secondary piston a spring 15 is provided which on an inner surface of the Primary piston 19 presses.
  • the injector also has several at low pressure standing bores or rooms. So there is a room 16 in the area between the plunger 7 and one end of the nozzle needle 2. This space 16 is over a leakage hole 27 and 29 with a return 25 in connection.
  • the Piezo Actuator-20 is arranged in a leakage space 26, which is also in the Return flows. This space 26 continues through a relief bore 18 in connection with a room 17, in which the spring 15 is arranged.
  • the work area 28 in the area the plate spring 13 is always full of fuel, the due to the play between the upper area of the plunger 7 and the housing 5 penetrates into this space.
  • the effective areas for printing are closed Nozzle designed so that the ring surface on the plunger 7 somewhat is smaller than the ring area on the pressure shoulder of the Nozzle needle 2. It therefore remains even when the nozzle is closed Nozzle needle 2 always has a resulting compressive force acts above, but is such that it depends on the spring force of the spring 15 is exceeded, whereby the nozzle needle 2 safely on their seat is pressed. In this position there is no Injection.
  • the mentioned effective diameter of the ram 7 and the nozzle needle 2 are designed so that the Spring 15 designed for acceptable, small forces can be. However, the spring force must be so great that the Nozzle needle 2 quickly enough at the end of the injection Seat can be pressed. It should be borne in mind that them up during the injection of the nozzle seat works. A quick closing of the nozzle needle has an effect favorably on the exhaust gas values of the internal combustion engine.
  • a piezo actuator offers the possibility of faster switching operations to realize as an electromagnet. Problematic are the small ways that a piezo actuator makes and therefore have to be translated.
  • the plunger 7 to the housing 5 and the secondary piston 14 to Primary piston 19 and the primary piston 19 to the actuator housing 12 are paired with fits.
  • One part of the leak goes towards the nozzle needle 2 and must pass through the leakage holes 29 and 27 are fed to the return.
  • the other part of the leak arrives in the work space 28 and keeps it filled.
  • Leakage fuel with excess flow passes on Secondary piston 14 along the relief bore 18 in the leakage space 26 and from there to the return line 25.
  • the work space 28 is therefore always full of fuel.
  • the Disc spring 13 presses the primary piston 19 with a defined one Biasing force against the piezo actuator 20 without play in the Starting position.
  • the plunger 7 from the spring 15 via the secondary piston 14 after pressed down (no injection in this state).
  • the piezo actuator 20 expands downward and moves the primary piston 19 against the force of the plate spring 13 also down.
  • the volume of liquid in the Working space 28 is displaced and guides the secondary piston 14 with the plunger upwards, causing the nozzle needle 2 due the resulting pressure force is moved upwards.
  • the start of injection is triggered.
  • the return 25 is relieved to low pressure.
  • Piezostacks are preferred which operate with relieve relatively small voltages in the vehicle.

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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)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die Erfindung betrifft ein Einspritzventil nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an injection valve according to the preamble of claim 1.

Ein solches Einspritzventil ist beispielsweise durch die EP-A 0 531 533 bekannt. Diese Veröffentlichung behandelt eine Dieseleinspritzeinrichtung mit einem Hochdrucksystem (Common-Rail-System), bei dem der Kraftstoff einem Hochdruckspeicher über eine Hochdruckpumpe zugeführt wird. Dieser unter hohem Druck stehende Kraftstoff wird dann entsprechend einer Steuerung den einzelnen Zylindern eines Dieselmotors über Einspritzventile zugeführt. Dabei werden die Einspritzventile jeweils über ein Magnetventil angesteuert, um beispielsweise auch individuelle Einspritzzeiten zu ermöglichen.Such an injection valve is, for example, by EP-A 0 531 533 known. This publication deals with one Diesel injection device with a high-pressure system (common rail system), where the fuel is a high pressure accumulator is fed via a high pressure pump. This one under high Pressurized fuel is then controlled the individual cylinders of a diesel engine via injectors fed. The injectors each controlled by a solenoid valve, for example also enable individual injection times.

Um insbesondere Einspritzventile zu erhalten, mit denen auch eine Voreinspritzung möglich ist, um damit Verbrauch, Abgaswerte, Geräusch usw. zu verbessern, sollen die Einspritzventile bei hohen Einspritzdrücken schnell schaltbar sein. Bei hohen Speicherdrücken ist bei Verwendung eines Magnetventils eine Voreinspritzung schwer möglich, da die Schaltzeiten des Magnetventils zu lang sind und der volle Hub des Ventils durchlaufen werden muß, damit reproduzierbare Bedingungen, beispielsweise die Einspritzmenge, erreicht werden. Außerdem ist die Formung der Einspritzrate, d.h. langsames Öffnen, jedoch schnellstes Schließen der Düsennadel, wobei die Formung der Einspritzrate gemäß einem Kennfeld vorgenommen werden kann, kaum möglich.In particular, to get injectors with which too a pre-injection is possible to reduce consumption, exhaust gas values, The injectors are said to improve noise, etc. can be switched quickly at high injection pressures. At high storage pressures when using a solenoid valve a pre-injection difficult because the switching times of the Solenoid valve are too long and the full stroke of the valve must be run through so that reproducible conditions, for example the injection quantity can be achieved. Moreover is the formation of the injection rate, i.e. slow opening, however, quickest closing of the nozzle needle, the shaping the injection rate according to a map can hardly be possible.

Ein piezoelektrisch betätigtes Einspritzventil ist aus der US-A-5 335 861 bekannt.A piezoelectrically actuated injection valve is known from US-A-5 335 861.

Es ist Aufgabe der vorliegenden Erfindung, ein Einspritzventil bereitzustellen, das äußerst schnell schaltbar ist. It is an object of the present invention to provide an injection valve to provide, which can be switched extremely quickly.

Diese Aufgabe wird durch den Patentanspruch 1 gelöst. Vorteilhafte Weiterbildungen sind in den Unteransprüchen gekennzeichnet.This object is solved by claim 1. Beneficial Further training is characterized in the subclaims.

Da die Düsennadel durch den Piezoaktuator praktisch direkt betätigt wird, wird eine schnellstmögliche Betätigung der Düsennadel erzielt.Because the nozzle needle is practically direct through the piezo actuator is actuated, the fastest possible actuation of the Nozzle needle achieved.

Im folgenden wird die Erfindung anhand einer Abbildung näher erläutert.In the following, the invention is illustrated by an illustration explained.

Die Abbildung zeigt ein Einspritzventil im Schnitt.The illustration shows an injection valve in section.

Das in der Abbildung gezeigte Einspritzventil besteht aus einem langgestreckten Gehäuse 5, auf dessem unteren Ende eine Überwurfmutter 3 aufgeschraubt ist. Mit dieser Überwurfmutter 3 wird vom unteren Ende des Gehäuses 5 aus eine Zwischenscheibe 4 und ein Düsenkörper 1, in welchem eine Düsennadel 2 geführt ist, gehalten. Die Zwischenscheibe 4 und der Düsenkörper 1 weisen eine Mittelbohrung auf, in der die Düsennadel 2 in axialer Richtung verschiebbar geführt ist. Im Gehäuse 5 ist in axialer Richtung ein abgestufter Stößel 7 geführt, der an einem Ende an der Düsennadel 2 anliegt und am anderen Ende mit einem Sekundärkolben 14 der piezoelektrischen Antriebseinrichtung verbunden ist. Im Bereich der Abstufung des Stößels 7 ist ein erster Druckraum 8 vorgesehen, der über eine Zulaufbohrung 9 mit einem Kraftstoff-Zulaufanschluß 10 verbunden ist. Dieser Hochdruck-Zulaufanschluß 10 ist außerdem über eine Zulaufbohrung 6 mit einem zweiten Druckraum 11 verbunden, in dessem Bereich die Düsennadel 2 abgestuft ist, wodurch eine Steuerfläche zur Steuerung der Düsennadel 2 gebildet wird.The injector shown in the figure consists of an elongated housing 5, one on its lower end Union nut 3 is screwed on. With this cap nut 3 is an intermediate washer from the lower end of the housing 5 4 and a nozzle body 1, in which a nozzle needle 2 is kept. The washer 4 and the nozzle body 1 have a center hole in which the nozzle needle 2 is guided displaceably in the axial direction. In the housing 5 a stepped plunger 7 is guided in the axial direction abuts the nozzle needle 2 at one end and at the other end with a secondary piston 14 of the piezoelectric drive device connected is. In the area of grading Ram 7 is a first pressure chamber 8 is provided, which an inlet bore 9 with a fuel inlet connection 10 connected is. This high pressure inlet port 10 is also via an inlet bore 6 with a second pressure chamber 11 connected, in whose area the nozzle needle 2 is stepped, whereby a control surface for controlling the nozzle needle 2 is formed.

Wie oben beschrieben steht der Stößel 7 mit einem Sekundärkolben 14 in Verbindung, der in einem Primärkolben geführt ist. Auf den Primärkolben wirkt ein Piezoaktuator 20 ein, der in einem Verschluß 21 gelagert ist und gegenüber dem Aktuatorgehäuse 12 mittels eines O-Ringes 22 abgedichtet ist. In axialer Richtung ist der Verschluß 21 mittels eines Sicherungsringes 24 gesichert. Elektrische Anschlüsse 23 sind zum Aktuator 20 geführt.As described above, the tappet 7 has a secondary piston 14 in connection, which is guided in a primary piston is. A piezo actuator 20 acts on the primary piston is stored in a closure 21 and opposite the actuator housing 12 is sealed by means of an O-ring 22. In The closure 21 is in the axial direction by means of a locking ring 24 secured. Electrical connections 23 are for Actuator 20 out.

Der Piezoaktuator 20 wirkt über den Primärkolben 19 auf eine Tellerfeder 13. Weiter ist in der Ausnehmung des Sekundärkolbens eine Feder 15 vorgesehen, die auf eine Innenfläche des Primärkolbens 19 drückt.The piezo actuator 20 acts on the primary piston 19 Disc spring 13. Next is in the recess of the secondary piston a spring 15 is provided which on an inner surface of the Primary piston 19 presses.

Das Einspritzventil weist außerdem mehrere unter Niederdruck stehende Bohrungen bzw. Räume auf. So befindet sich ein Raum 16 im Bereich zwischen dem Stößel 7 und einem Ende der Düsennadel 2. Dieser Raum 16 steht über eine Leckagebohrung 27 und 29 mit einem Rücklauf 25 in Verbindung. Der Piezoaktuator-20 ist in einem Leckageraum 26 angeordnet, der ebenfalls in den Rücklauf mündet. Dieser Raum 26 steht weiter über eine Entlastungsbohrung 18 mit einem Raum 17 in Verbindung, in welchem die Feder 15 angeordnet ist. Der Arbeitsraum 28 im Bereich der Tellerfeder 13 ist immer satt mit Kraftstoff gefüllt, der aufgrund des Spiels zwischen dem oberen Bereich des Stößels 7 und dem Gehäuse 5 in diesen Raum eindringt.The injector also has several at low pressure standing bores or rooms. So there is a room 16 in the area between the plunger 7 and one end of the nozzle needle 2. This space 16 is over a leakage hole 27 and 29 with a return 25 in connection. The Piezo Actuator-20 is arranged in a leakage space 26, which is also in the Return flows. This space 26 continues through a relief bore 18 in connection with a room 17, in which the spring 15 is arranged. The work area 28 in the area the plate spring 13 is always full of fuel, the due to the play between the upper area of the plunger 7 and the housing 5 penetrates into this space.

Die wirksamen Flächen für den Druck sind bei geschlossener Düse so ausgelegt, daß die Ringfläche am Stößel 7 etwas kleiner ist als die Ringfläche an der Druckschulter der Düsennadel 2. Es verbleibt daher auch bei geschlossener Düsennadel 2 immer eine resultierende Druckkraft, die nach oben wirkt, aber so ist, daß sie von der Federkraft der Feder 15 übertroffen wird, wodurch die Düsennadel 2 sicher auf ihren Sitz gedrückt wird. In dieser Stellung erfolgt keine Einspritzung. Die genannten wirksamen Durchmesser des Stößels 7 und der Düsennadel 2 werden jedoch so ausgelegt, daß die Feder 15 auf vertretbare, möglichst kleine Kräfte ausgelegt werden kann. Die Federkraft muß jedoch so groß sein, daß die Düsennadel 2 bei Ende der Einspritzung schnell genug auf den Sitz gedrückt werden kann. Dabei ist zu berücksichtigen, daß sie während der Einspritzung der Düsensitzfläche nach oben wirkt. Ein schneller Schließvorgang der Düsennadel wirkt sich günstig auf die Abgaswerte der Brennkraftmaschine aus.The effective areas for printing are closed Nozzle designed so that the ring surface on the plunger 7 somewhat is smaller than the ring area on the pressure shoulder of the Nozzle needle 2. It therefore remains even when the nozzle is closed Nozzle needle 2 always has a resulting compressive force acts above, but is such that it depends on the spring force of the spring 15 is exceeded, whereby the nozzle needle 2 safely on their seat is pressed. In this position there is no Injection. The mentioned effective diameter of the ram 7 and the nozzle needle 2 are designed so that the Spring 15 designed for acceptable, small forces can be. However, the spring force must be so great that the Nozzle needle 2 quickly enough at the end of the injection Seat can be pressed. It should be borne in mind that them up during the injection of the nozzle seat works. A quick closing of the nozzle needle has an effect favorably on the exhaust gas values of the internal combustion engine.

Ein Piezoaktuator bietet die Möglichkeit, schnellere Schaltvorgänge als ein Elektromagnet zu realisieren. Problematisch sind jedoch die kleinen Wege, die ein Piezoaktuator macht und deshalb übersetzt werden müssen.A piezo actuator offers the possibility of faster switching operations to realize as an electromagnet. Problematic are the small ways that a piezo actuator makes and therefore have to be translated.

Die Funktionsweise des Piezoaktuators auf die Einspritzdüse ist folgende:How the piezo actuator works on the injector is the following:

Der Stößel 7 zum Gehäuse 5 und der Sekundärkolben 14 zum Primärkolben 19 sowie der Primärkolben 19 zum Aktuatorgehäuse 12 sind zueinander mit Passungen gepaart. Die Passungen stellen jedoch nur eine Spaltdichtung dar, so daß eine kleine Menge Kraftstoff ständig vom Zulauf 10 durch den Druckraum 8 am Stößel 7 entlang lecken kann. Der eine Leckageanteil geht in Richtung Düsennadel 2 und muß über die Leckagebohrungen 29 und 27 dem Rücklauf zugeführt werden. Der andere Leckageanteil gelangt in den Arbeitsraum 28 und hält diesen befüllt. Überschüssig durchströmter Leckagekraftstoff gelangt am Sekundärkolben 14 entlang über die Entlastungsbohrung 18 in den Leckageraum 26 und von dort zum Rücklauf 25. Der Arbeitsraum 28 ist somit immer satt mit Kraftstoff gefüllt. Die Tellerfeder 13 drückt den Primärkolben 19 mit einer definierten Vorspannkraft gegen den Piezoaktuator 20 spielfrei in die Ausgangsstellung. In der Ausgangsstellung (Ruhestellung) wird der Stößel 7 von der Feder 15 über den Sekundärkolben 14 nach unten gedrückt (keine Einspritzung in diesem Zustand). Bei Bestromen des Piezoaktuators 20 dehnt sich dieser nach unten aus und bewegt den Primärkolben 19 gegen die Kraft der Tellerfeder 13 ebenfalls nach unten. Das Flüssigkeitsvolumen im Arbeitsraum 28 wird verdrängt und führt den Sekundärkolben 14 mit dem Stößel nach oben, wodurch die Düsennadel 2 aufgrund der resultierenden Druckkraft nach oben bewegt wird. Hierdurch wird der Einspritzbeginn ausgelöst. The plunger 7 to the housing 5 and the secondary piston 14 to Primary piston 19 and the primary piston 19 to the actuator housing 12 are paired with fits. The fits however, only represent a gap seal, so that a small Amount of fuel constantly from the inlet 10 through the pressure chamber 8 can lick along the plunger 7. One part of the leak goes towards the nozzle needle 2 and must pass through the leakage holes 29 and 27 are fed to the return. The other part of the leak arrives in the work space 28 and keeps it filled. Leakage fuel with excess flow passes on Secondary piston 14 along the relief bore 18 in the leakage space 26 and from there to the return line 25. The work space 28 is therefore always full of fuel. The Disc spring 13 presses the primary piston 19 with a defined one Biasing force against the piezo actuator 20 without play in the Starting position. In the starting position (rest position) the plunger 7 from the spring 15 via the secondary piston 14 after pressed down (no injection in this state). At Current supply to the piezo actuator 20 expands downward and moves the primary piston 19 against the force of the plate spring 13 also down. The volume of liquid in the Working space 28 is displaced and guides the secondary piston 14 with the plunger upwards, causing the nozzle needle 2 due the resulting pressure force is moved upwards. Hereby the start of injection is triggered.

Diese Konstruktion des Piezoaktuators mit den beiden Kolben gewährleistet, daß der Stößel 7 und damit die Düsennadel 2 immer aus einer definierten Ausgangslage bewegt werden. Für die Bewegung der Düsennadel 2 ist allein die Dynamik des Sekundärkolbens 14 mit dem stößel 7 maßgebend und nicht die Dynamik einer Hydraulik wie bei bekannten Systemen mit Ventilen. Alle Wärmedehnungen sind kompensiert. Der Arbeitsraum ist immer satt gefüllt. Der Piezoaktuator ist praktisch immer auf die gleiche Vorspannkraft gespannt.This construction of the piezo actuator with the two pistons ensures that the plunger 7 and thus the nozzle needle 2 always be moved from a defined starting position. For the movement of the nozzle needle 2 is only the dynamics of the Secondary piston 14 with the tappet 7 decisive and not the Dynamics of hydraulics like in known systems with valves. All thermal expansions are compensated. The work space is always full. The piezo actuator is practically always excited about the same preload.

Der Rücklauf 25 ist auf Niederdruck entlastet. Als Piezoaktuator werden Piezostacks favorisiert, die einen Betrieb mit relativ kleinen Spannungen auch im Fahrzeug erleichtern.The return 25 is relieved to low pressure. As a piezo actuator Piezostacks are preferred which operate with relieve relatively small voltages in the vehicle.

Claims (7)

  1. Injection valve for fuel injection systems with a nozzle needle (2) arranged in a valve housing (1) and an associated seat, which can at least open and close an injection opening of the injection valve,
    a fuel inlet (10) which is hydraulically connected via a first pressure chamber (8) with a first control surface of the tappet (7) which drives the nozzle needle (2), and via second pressure chamber (11) with a second control surface of the nozzle needle (2),
    with the first control surface being larger than the second control surface and the first control surface which applies pressure to the nozzle needle (2) in the direction of the associated seat and applies pressure to the second control surface of the nozzle needle which lifts the nozzle needle (2) from the seat,
    a control device which is hydraulically transmitted via a primary and secondary piston (14, 19) and which controls the nozzle needle (2),
    characterised in that the control device has piezo-actuator (20), that the piezo-actuator (20) directly drives the primary piston (19) and that the nozzle needle (2) can be directly driven via the tappet (7) and the secondary piston (14).
  2. Injection valve in accordance with Claim 1, characterised in that the secondary piston (14) is permanently connected to the tappet (7) and pre-loaded against the primary piston (19) by means of a spring (15).
  3. Injection valve in accordance with Claims 1 and 2, characterised in that the spring (15) pre-loads the secondary piston (14) in the direction of the nozzle needle (2).
  4. Injection valve in accordance with Claim 1, characterised in that the control surfaces are formed by annular surfaces and one of the annular surfaces of the tappet (7) is somewhat smaller than the other annular surface at the pressure shoulder of the nozzle needle (2), so that a resulting force always remains in the direction of the driving device.
  5. Injection valve in accordance with Claim 4, characterised in that the resulting force is less than the force exerted by the spring (15), so that the nozzle needle (2) is always pressed against its seat when the control device is inactive.
  6. Injection valve in accordance with Claim 1, characterised in that the working chamber (28) formed between the primary piston (19) and secondary piston (14) is always filled by a leakage flow of the injection valve.
  7. Injection valve in accordance with Claim 6, characterised in that clearances are provided between the tappet (7) and the housing (5), between the primary piston (19) and secondary piston (14) and also between the primary piston (19) and the housing (12), which are arranged so that a slight leakage always takes place between them, so that the working chamber (28) is always filled with liquid and in the event of thermal expansion the piezo-actuator has a clearance-compensated, pressure pre-loaded and clearly-defined starting position before an electrical voltage is applied.
EP96914853A 1995-05-24 1996-05-11 Injection valve Expired - Lifetime EP0828936B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19519191 1995-05-24
DE19519191A DE19519191C2 (en) 1995-05-24 1995-05-24 Injector
PCT/DE1996/000818 WO1996037698A1 (en) 1995-05-24 1996-05-11 Injection valve

Publications (2)

Publication Number Publication Date
EP0828936A1 EP0828936A1 (en) 1998-03-18
EP0828936B1 true EP0828936B1 (en) 2000-03-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914853A Expired - Lifetime EP0828936B1 (en) 1995-05-24 1996-05-11 Injection valve

Country Status (4)

Country Link
EP (1) EP0828936B1 (en)
DE (2) DE19519191C2 (en)
ES (1) ES2145446T3 (en)
WO (1) WO1996037698A1 (en)

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US5979803A (en) * 1997-05-09 1999-11-09 Cummins Engine Company Fuel injector with pressure balanced needle valve
US5884848A (en) * 1997-05-09 1999-03-23 Cummins Engine Company, Inc. Fuel injector with piezoelectric and hydraulically actuated needle valve
DE19726125C2 (en) * 1997-06-20 1999-04-15 Telefunken Microelectron Fuel injection method
DE19727992C2 (en) * 1997-07-01 1999-05-20 Siemens Ag Compensation element for compensation of temperature-related changes in length of electromechanical control systems
DE19742943C1 (en) * 1997-09-29 1999-04-22 Siemens Ag Coupling device between actuator and valve setting element
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DE59604782D1 (en) 2000-04-27
WO1996037698A1 (en) 1996-11-28
DE19519191C2 (en) 1997-04-10
DE19519191A1 (en) 1996-12-19
ES2145446T3 (en) 2000-07-01
EP0828936A1 (en) 1998-03-18

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