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EP1505295B1 - Method of positioning an actuator of a fuel injector and apparatus to carry out the method - Google Patents

Method of positioning an actuator of a fuel injector and apparatus to carry out the method Download PDF

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Publication number
EP1505295B1
EP1505295B1 EP20040026927 EP04026927A EP1505295B1 EP 1505295 B1 EP1505295 B1 EP 1505295B1 EP 20040026927 EP20040026927 EP 20040026927 EP 04026927 A EP04026927 A EP 04026927A EP 1505295 B1 EP1505295 B1 EP 1505295B1
Authority
EP
European Patent Office
Prior art keywords
housing
piezoactuator
fuel injector
ring
actuating element
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
Application number
EP20040026927
Other languages
German (de)
French (fr)
Other versions
EP1505295A1 (en
Inventor
Wilhelm Frank
Wendelin KLÜGL
Stefan Lehmann
Günter LEWENTZ
Martin Dr. Neumaier
Reda Rizk
Gerd Dr. Schmutzler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
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Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP1505295A1 publication Critical patent/EP1505295A1/en
Application granted granted Critical
Publication of EP1505295B1 publication Critical patent/EP1505295B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8092—Fuel injection apparatus manufacture, repair or assembly adjusting or calibration
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/598—With repair, tapping, assembly, or disassembly means
    • Y10T137/5987—Solenoid or electromagnetically operated valve
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
    • Y10T29/49416—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting
    • Y10T29/49423—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting including metal deforming

Definitions

  • the invention relates to a method for positioning the actuator in a fuel injector according to the preamble of claims 1; a device for carrying out the method according to the preamble of patent claim 2 and a fuel injector according to the preamble of patent claim 6
  • the fuel injector generally includes an injector that is hydraulically opened and closed by a servo valve to precisely define the timing of the injection event in the combustion chamber.
  • the servo valve is actuated by an electrically actuated actuator, with the use of piezoelectric actuators especially for achieving sufficiently short switching times has proven to be favorable.
  • a longitudinal expansion is caused by the application of voltage, which is transmitted to the servo valve, which in turn opens or closes the injection valve.
  • this longitudinal expansion is generally amplified either mechanically by a lever-type translator mounted in fuel or hydraulically by a pressure chamber.
  • a fuel injector with a piezoelectric actuator and hydraulic amplification is for example in U.S. Patent No. 5,779,149 described.
  • the idle stroke should on the one hand be as small as possible in order to always have defined conditions and to keep the dynamic loads low. On the other hand, always a minimum clearance between the actuator and actuator must be guaranteed in order to avoid malfunctions during operation.
  • the setting of the idle stroke in the fuel injector is so far made so that the exact arrangement of the individual components of the fuel injector and in particular their distances from one another mathematically determined from the dimensions of these components.
  • each component must be individually measured consuming. After measuring the idle stroke is then adjusted by arranged between the injector and the actuator or the servo valve shims, which may have only a minimum tolerance and therefore are very expensive to manufacture.
  • the document EP0869278 also shows such an injection valve in which the thermal Ausdehrung of the piezoelectric actuator is compensated by an appropriate choice of materials or corresponding shims.
  • Object of the present invention is to provide a method for positioning the actuator in a fuel injector and an apparatus for performing such a method in which or in the low-cost reliable positioning of the actuator in the fuel injector is possible and the or the a series-compatible functional test of the fuel injector allowed.
  • the above object is accordingly achieved in that a compensation ring between the piezoelectric actuator and the housing of the fuel injector is provided.
  • the compensation ring is inserted into the fuel injector, which is completely assembled except for the piezoelectric actuator, and is deformed by a pretensioning device with a plane effective surface until the servo valve lifts off from its valve seat. Then screw in place of the biasing device the piezoelectric actuator to the stop on the balancing ring in the injector, so inevitably sets the previously set as above empty idle between the bottom plate of the piezoelectric actuator and the actuator of the fuel injector servo valve.
  • In order for an operative connection between the piezoelectric actuator and the actuator for the servo valve with fixed positions is formed such that the idle stroke between the piezoelectric actuator and actuator always corresponds to the predetermined value despite the inevitable manufacturing tolerances of the individual components.
  • the balance ring is preferably made of soft iron or soft copper.
  • the piezoelectric actuator can be ground flat prior to its installation without applied voltage, wherein the proposed idle stroke is set in the deformation of the balancing ring via a survey on the biasing device.
  • the biasing device is not made of a flat stamp, but of a stamp with embossed front.
  • the drawing shows schematically a sectional view of a fuel injector in the region of the connection between a piezoelectric actuator and an actuator for a servo valve.
  • the figure of the drawing shows in section a part of an injector for fuel injection into the combustion chamber of an internal combustion engine in a common rail system.
  • a piezoelectric actuator 2 In the housing 1 of the fuel injector is a piezoelectric actuator 2 with a Housing 3 and a bottom plate 4 screwed.
  • a piezoelectric element arrangement In the housing 3 of the piezoelectric actuator 2 is a piezoelectric element arrangement (not shown in detail), with which the bottom plate 4 is in communication.
  • supply lines also not shown
  • the piezoactuator 2 When it is electrically actuated, the piezoactuator 2 acts on a transmission element 5 in the fuel injector housing 1. That is, when applying a voltage to said piezoelectric element assembly, the bottom plate 4 of the piezoelectric actuator 2 due to the induced by the applied voltage elongation of the piezoelectric elements from the actuator housing to the outside, in the drawing down, shifts, whereby the transmission element 5 moves accordingly becomes.
  • the transmission element 5 in the fuel injector housing 1 in turn acts on a valve stem 6, which bears against a valve element 7 of a servo valve.
  • the valve element 7 is, as long as the piezoelectric actuator 2 is not driven, pressed by a spring 8 in its valve seat.
  • a hydraulic ratio of the stroke of the piezoelectric actuator 2 may be provided.
  • the bottom plate 4 of the piezoelectric actuator 2 acts on an actuator for the servo valve of the fuel injector. Piezo actuator 2 and actuator form the actuator for the servo valve.
  • valve element 7 of the servo valve is pressed by the spring 8 back into its seat, so that in the sequence of pressure in the control chamber of the injection valve again increases and the injection valve closes.
  • the transmission element 5 which may be a mechanical lever translator or a hydraulic translator, transmits this movement increasingly to the valve stem 6, which actuates the valve element 7 of the servo valve.
  • the piezoelectric actuator 2 is machined prior to installation in the injector 1 so that the bottom plate 4 by exactly the predetermined idle stroke .DELTA.h is opposite to the housing 3 of the piezoelectric actuator.
  • the voltage U is applied to the piezoelectric actuator 2 prior to installation in the injector housing 1, which causes a longitudinal expansion of the piezoelectric element assembly according to the predetermined idle stroke .DELTA.h, and it will be the housing 3 and the bottom plate 4 of the piezoelectric actuator 2 ground plane with applied voltage U.
  • the piezoelectric actuator 2 can be clamped for example in a grinding machine, wherein the voltage U is supplied via slip rings.
  • the bottom plate 4 is then back by the predetermined idle stroke ⁇ h with respect to the housing 3 of the piezoelectric actuator 2.
  • the manufacturing and other tolerances on the part of the fuel injector are compensated by the compensation ring 9.
  • the compensation ring 9 which consists of a soft, deformable material such as soft iron or soft copper, is inserted into the fuel injector, which is completely assembled except for the piezoelectric actuator 2. Then, instead of the piezoelectric actuator 2, a biasing device is screwed into the fuel injector whose front side, which corresponds to the side of the piezoelectric actuator 2 with the bottom plate 4, is completely flat. The biasing device is screwed in until, due to the actuation of the transmission element 5 by the planar front of the biasing device, the valve element 7 of the servo valve begins to lift off its valve seat. In this case, consisting of a soft material compensation ring 9, which also acts on the flat front of the biasing device, permanently deformed by material flow. The balance ring 9 then retains the thickness it had when the pretensioner was screwed in so far that the servo valve began to open upon removal of the pretensioner.
  • a soft material compensation ring 9 which also acts on the flat front of the biasing device, permanently deformed
  • the piezoactuator 2 whose bottom plate 4 is retarded by the given idle stroke ⁇ h, is screwed into the housing 1 of the fuel injector as far as it will go, ie until the piezoactuator housing 3 abuts the compensation ring 9, then the leading edge is located of the piezo actuator housing 3 exactly at the height that had the front of the biasing device when the servo valve began to open.
  • the bottom plate 4 of the piezoelectric actuator 2 is set back by the predetermined idle stroke .DELTA.h corresponds the idle stroke of the actuator in the fuel injector, that is the game between bottom plate 4 of the piezoelectric actuator 2 and servo valve, exactly the predetermined value .DELTA.h.
  • the piezoelectric actuator 2 is processed prior to installation in the injector 1 so that the bottom plate 4 and the housing 3 of the piezoelectric actuator 2 in the ready-to-install state, but ground without applied voltage.
  • the bottom plate 4 of the piezoelectric actuator 2 is thus at the same height as the housing 3 of the piezoactuator 2 at night.
  • the pretensioning device 9 does not have a plane front side, but rather a front side, which is in contact with the one or more points. at which or the biasing means acts on the transmission element 5, a survey of the height .DELTA.h has.
  • the central effective surface on the biasing device, which engages with the transmission element 5, is in other words in the installation direction by the predetermined value .DELTA.h for the idle stroke against the peripheral edge of the active surface, which comes into engagement with the balance ring 9.
  • the biasing means is screwed as far as in the fuel injector instead of the piezoelectric actuator 2 as in the first-mentioned embodiment until the actuation of the transmission element 5 by the raised portion on the front of the biasing means, the valve element 7 of the servo valve begins to open.
  • the compensation ring 9 is thereby deformed as above permanently.
  • the biasing device of the piezoelectric actuator 2 were ground flat in the case 3 and bottom plate 4 without voltage applied, screwed into the housing 1 of the fuel injector to the stop on the balance ring 9.
  • the idle stroke between the piezoelectric actuator 2 and servo valve exactly the predetermined value .DELTA.h on, since the thickness of the balancing ring 9 is set with the biasing means so that the servo valve begins to open during operation of the fuel injector after the bottom plate 4 of the piezoelectric actuator 2 has covered the free travel .DELTA.h when it is driven.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Positionieren des Stellantriebs in einem Kraftstoffinjektor gemäß dem Oberbegriff der Patentansprüche 1; eine Vorrichtung zur Durchführung des Verfahrens gemäß dem Oberbegriff des Patentanspruchs 2 und einen Kraftstoffinjektor gemäß dem Oberbegriff des Patentanspruchs 6.The invention relates to a method for positioning the actuator in a fuel injector according to the preamble of claims 1; a device for carrying out the method according to the preamble of patent claim 2 and a fuel injector according to the preamble of patent claim 6

Bei der Kraftstoffversorgung von Verbrennungsmotoren werden zunehmend Speichereinspritzsysteme verwendet, bei denen mit sehr hohen Einspritzdrücken und schnellen Schaltgeschwindigkeiten gearbeitet wird. Solche Einspritzsysteme sind als Common-Rail-Systeme (für Dieselmotoren) und HPDI-Einspritzsysteme (für Ottomotoren) bekannt. Bei diesen Speichereinspritzsystemen wird der Kraftstoff mittels einer Hochdruckpumpe in einen allen Zylindern des Motors gemeinsamen Hochdruckspeicher gefördert, von dem aus der Kraftstoff mit Hilfe von Kraftstoffinjektoren in die einzelnen Brennkammern des Verbrennungsmotors eingespritzt wird.In the fuel supply of internal combustion engines are increasingly used storage injection systems, which operate at very high injection pressures and fast switching speeds. Such injection systems are known as common-rail systems (for diesel engines) and HPDI injection systems (for gasoline engines). In these accumulator injection systems, the fuel is conveyed by means of a high-pressure pump into a high-pressure accumulator common to all cylinders of the engine, from which the fuel is injected into the individual combustion chambers of the internal combustion engine with the aid of fuel injectors.

Der Kraftstoffinjektor umfasst im Allgemeinen ein Einspritzventil, das hydraulisch von einem Servoventil geöffnet und geschlossen wird, um den zeitlichen Verlauf des Einspritzvorgangs in der Brennkammer genau festzulegen.The fuel injector generally includes an injector that is hydraulically opened and closed by a servo valve to precisely define the timing of the injection event in the combustion chamber.

Das Servoventil wird dabei von einem elektrisch angesteuerten Aktor betätigt, wobei sich vor allem der Einsatz von piezoelektrischen Aktoren zum Erzielen ausreichend kurzer Schaltzeiten als günstig erwiesen hat. In einem solchen piezoelektrischen Aktor wird durch Anlegen von Spannung eine Längsdehnung hervorgerufen, die auf das Servoventil übertragen wird, das dann wiederum das Einspritzventil öffnet oder schließt.The servo valve is actuated by an electrically actuated actuator, with the use of piezoelectric actuators especially for achieving sufficiently short switching times has proven to be favorable. In such a piezoelectric actuator, a longitudinal expansion is caused by the application of voltage, which is transmitted to the servo valve, which in turn opens or closes the injection valve.

Damit die im µm-Bereich liegende Längsdehnung des piezoelektrischen Aktors das Servoventil betätigen kann, wird diese Längsdehnung im allgemeinen entweder mechanisch durch einen in Kraftstoff gelagerten Hebelübersetzer oder hydraulisch durch einen Druckraum verstärkt.In order for the longitudinal expansion of the piezoelectric actuator lying in the μm range to actuate the servo valve, this longitudinal expansion is generally amplified either mechanically by a lever-type translator mounted in fuel or hydraulically by a pressure chamber.

Ein Kraftstoffinjektor mit einem Piezoaktor und hydraulischer Verstärkung ist zum Beispiel im US-Patent Nr. 5 779 149 beschrieben.A fuel injector with a piezoelectric actuator and hydraulic amplification is for example in U.S. Patent No. 5,779,149 described.

Um die für einen optimalen Verbrennungsverlauf erforderlichen hohen Schaltgeschwindigkeiten und kleinen Einspritzmengen mit dem Kraftstoffinjektor erzielen zu können, ist es erforderlich, den Kraftstoffinjektor sehr genau einzustellen.In order to be able to achieve the high switching speeds and small injection quantities required for an optimal combustion process with the fuel injector, it is necessary to set the fuel injector very precisely.

Dies gilt insbesondere für den Leerhub zwischen dem piezoelektrischen Aktor und dem Servoventil. Der Leerhub soll einerseits möglichst klein sein, um stets definierte Bedingungen zu haben und um die dynamischen Belastungen gering zu halten. Andererseits muss stets ein Mindestspiel zwischen Aktor und Stellelement gewährleistet sein, um Fehlfunktionen im Betrieb zu vermeiden.This is especially true for the idle stroke between the piezoelectric actuator and the servo valve. The idle stroke should on the one hand be as small as possible in order to always have defined conditions and to keep the dynamic loads low. On the other hand, always a minimum clearance between the actuator and actuator must be guaranteed in order to avoid malfunctions during operation.

Die Einstellung des Leerhubs im Kraftstoffinjektor wird bisher so vorgenommen, dass die genaue Anordnung der einzelnen Komponenten des Kraftstoffinjektors und insbesondere deren Abstände zueinander rechnerisch aus den Abmessungen dieser Komponenten ermittelt werden.The setting of the idle stroke in the fuel injector is so far made so that the exact arrangement of the individual components of the fuel injector and in particular their distances from one another mathematically determined from the dimensions of these components.

Dazu muss jede Komponente einzeln aufwendig vermessen werden. Nach dem Ausmessen wird der Leerhub dann durch zwischen dem Injektorgehäuse und dem Aktor bzw. dem Servoventil angeordnete Einstellscheiben eingestellt, die nur eine minimale Toleranz aufweisen dürfen und die deshalb in der Fertigung sehr aufwendig sind.For this purpose, each component must be individually measured consuming. After measuring the idle stroke is then adjusted by arranged between the injector and the actuator or the servo valve shims, which may have only a minimum tolerance and therefore are very expensive to manufacture.

Um den eingestellten Leerhub zu überprüfen, ist es bisher weiterhin erforderlich, den Kraftstoffinjektor komplett zusammenzubauen und unter Betriebsbedingungen zu testen. Falls Funktionsfehler festgestellt werden, muss der Kraftstoffinjektor nach dem Testlauf wieder vollständig in seine Einzelteile zerlegt, neu vermessen und eventuell nachgearbeitet werden bzw. es müssen Einstellscheiben ausgetauscht werden.In order to check the set idle stroke, it has so far been necessary to completely assemble the fuel injector and test it under operating conditions. If malfunctions are detected, the fuel injector must be completely disassembled into its individual parts after the test run, re-measured and, if necessary, reworked or shims replaced.

Das Dokument EP0869278 zeigt ebenfalls so ein Einspritzventil, bei dem durch eine entsprechende Wahl der Materialien oder über entsprechende Ausgleichsscheiben die thermische Ausdehrung des piezoelektrischen Aktors kompensiert wird.The document EP0869278 also shows such an injection valve in which the thermal Ausdehrung of the piezoelectric actuator is compensated by an appropriate choice of materials or corresponding shims.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zum Positionieren des Stellantriebs in einem Kraftstoffinjektor und eine Vorrichtung zur Durchführung eines solchen Verfahrens zu schaffen, bei dem bzw. bei der mit geringem Aufwand ein zuverlässiges Positionieren des Stellantriebs im Kraftstoffinjektor möglich ist und das bzw. die eine serientaugliche Funktionsprüfung des Kraftstoffinjektors erlaubt.Object of the present invention is to provide a method for positioning the actuator in a fuel injector and an apparatus for performing such a method in which or in the low-cost reliable positioning of the actuator in the fuel injector is possible and the or the a series-compatible functional test of the fuel injector allowed.

Diese Aufgabe wird erfindungsgemäß mit den im Patentanspruch 1, im Patentanspruch 2 oder im Patentanspruch 6 angegebenen Maßnahmen gelöst. Bevorzugte Ausführungsformen der Erfindung sind in den Unteransprüchen angeführt.This object is achieved with the measures specified in claim 1, in claim 2 or in claim 6. Preferred embodiments of the invention are set forth in the subclaims.

Die obige Aufgabe wird demnach dadurch gelöst, dass ein Ausgleichsring zwischen Piezoaktor und dem Gehäuse des Kraftstoffinjektors vorgesehen ist. Der Ausgleichsring wird in den bis auf den Piezoaktor komplett zusammengebauten Kraftstoffinjektor eingelegt und durch eine Vorspanneinrichtung mit planer Wirkfläche so lange verformt, bis das Servoventil von seinem Ventilsitz abhebt. Schraubt man anschließend anstelle der Vorspanneinrichtung den Piezoaktor bis zum Anschlag am Ausgleichsring in das Injektorgehäuse ein, so stellt sich zwangsläufig der vorher wie oben angegeben eingestellte Leerhub zwischen der Bodenplatte des Piezoaktors und dem Stellelement des Kraftstoffinjektor-Servo-ventils ein. Damit wird eine Wirkverbindung zwischen dem Piezoaktor und dem Stellelement für das Servoventil mit festgelegten Positionen derart ausgebildet, dass der Leerhub zwischen Piezoaktor und Stellelement trotz der unvermeidlichen Herstellungstoleranzen der einzelnen Bauteile immer dem vorgegebenen Wert entspricht.The above object is accordingly achieved in that a compensation ring between the piezoelectric actuator and the housing of the fuel injector is provided. The compensation ring is inserted into the fuel injector, which is completely assembled except for the piezoelectric actuator, and is deformed by a pretensioning device with a plane effective surface until the servo valve lifts off from its valve seat. Then screw in place of the biasing device the piezoelectric actuator to the stop on the balancing ring in the injector, so inevitably sets the previously set as above empty idle between the bottom plate of the piezoelectric actuator and the actuator of the fuel injector servo valve. In order for an operative connection between the piezoelectric actuator and the actuator for the servo valve with fixed positions is formed such that the idle stroke between the piezoelectric actuator and actuator always corresponds to the predetermined value despite the inevitable manufacturing tolerances of the individual components.

Zum Planschleifen von Gehäuse und Bodenplatte des Piezoaktors wird dieser vorzugsweise in eine Schleifmaschine eingespannt, wobei die vorgegebene Spannung über Schleifringe an den Piezoaktor angelegt wird. Der Ausgleichsring besteht vorzugsweise aus Weicheisen oder weichem Kupfer. Beim Vorspannen fließt das Material des Ausgleichsrings, wodurch sich die Dicke des Ausgleichsrings bleibend verändert.For surface grinding of housing and bottom plate of the piezoelectric actuator, this is preferably clamped in a grinding machine, wherein the predetermined voltage is applied via slip rings to the piezoelectric actuator. The balance ring is preferably made of soft iron or soft copper. When prestressing, the material of the compensation ring flows, whereby the thickness of the compensation ring changes permanently.

Alternativ kann auch der Piezoaktor vor seinem Einbau ohne anliegende Spannung plan geschliffen werden, wobei der vorgesehene Leerhub bei der Verformung des Ausgleichsrings über eine Erhebung an der Vorspanneinrichtung eingestellt wird. Bei dieser alternativen Ausführungsform besteht somit die Vorspanneinrichtung nicht aus einem ebenen Stempel, sondern aus einem Stempel mit geprägter Vorderseite.Alternatively, the piezoelectric actuator can be ground flat prior to its installation without applied voltage, wherein the proposed idle stroke is set in the deformation of the balancing ring via a survey on the biasing device. In this alternative embodiment, therefore, the biasing device is not made of a flat stamp, but of a stamp with embossed front.

Ausführungsbeispiele der Erfindung werden im Folgenden anhand der Zeichnung näher erläutert. Die Zeichnung zeigt schematisch eine Schnittansicht eines Kraftstoffinjektors im Bereich der Verbindung zwischen einem Piezoaktor und einem Stellantrieb für ein Servoventil.Embodiments of the invention will be explained in more detail below with reference to the drawing. The drawing shows schematically a sectional view of a fuel injector in the region of the connection between a piezoelectric actuator and an actuator for a servo valve.

Die Figur der Zeichnung zeigt im Schnitt einen Teil eines Injektors zur Kraftstoffeinspritzung in den Brennraum eines Verbrennungsmotors bei einem Common-Rail-System. In das Gehäuse 1 des Kraftstoffinjektors ist ein Piezoaktor 2 mit einem Gehäuse 3 und einer Bodenplatte 4 eingeschraubt. Im Gehäuse 3 des Piezoaktors 2 befindet sich eine Piezoelementanordnung (im Einzelnen nicht gezeigt), mit der die Bodenplatte 4 in Verbindung steht. Wenn an die Piezoelementanordnung über (ebenfalls nicht gezeigte) Zuleitungen eine Spannung angelegt wird, verändert diese ihre Länge, und die Bodenplatte 4 verändert dadurch ihre Lage bezüglich des Aktorgehäuses 3.The figure of the drawing shows in section a part of an injector for fuel injection into the combustion chamber of an internal combustion engine in a common rail system. In the housing 1 of the fuel injector is a piezoelectric actuator 2 with a Housing 3 and a bottom plate 4 screwed. In the housing 3 of the piezoelectric actuator 2 is a piezoelectric element arrangement (not shown in detail), with which the bottom plate 4 is in communication. When a voltage is applied to the piezoelectric element arrangement via supply lines (also not shown), the latter changes its length, and the base plate 4 thereby changes its position relative to the actuator housing 3.

Der Piezoaktor 2 wirkt, wenn er elektrisch angesteuert wird, auf ein Übertragungselement 5 im Kraftstoffinjektorgehäuse 1 ein. Das heißt, dass sich beim Anlegen einer Spannung an die genannte Piezoelementanordnung die Bodenplatte 4 des Piezoaktors 2 aufgrund der von der angelegten Spannung hervorgerufenen Längsdehnung der Piezoelemente aus dem Aktorgehäuse nach außen, in der Zeichnung nach unten, verschiebt, wobei auch das Übertragungselement 5 entsprechend bewegt wird.When it is electrically actuated, the piezoactuator 2 acts on a transmission element 5 in the fuel injector housing 1. That is, when applying a voltage to said piezoelectric element assembly, the bottom plate 4 of the piezoelectric actuator 2 due to the induced by the applied voltage elongation of the piezoelectric elements from the actuator housing to the outside, in the drawing down, shifts, whereby the transmission element 5 moves accordingly becomes.

Das Übertragungselement 5 im Kraftstoffinjektorgehäuse 1 wirkt seinerseits auf einen Ventilstößel 6 ein, der an einem Ventilelement 7 eines Servoventils anliegt. Das Ventilelement 7 wird, solange der Piezoaktor 2 nicht angesteuert ist, von einer Feder 8 in seinen Ventilsitz gedrückt.The transmission element 5 in the fuel injector housing 1 in turn acts on a valve stem 6, which bears against a valve element 7 of a servo valve. The valve element 7 is, as long as the piezoelectric actuator 2 is not driven, pressed by a spring 8 in its valve seat.

Statt des gezeigten Übertragungselements 5 kann auch eine hydraulische Übersetzung des Hubs des Piezoaktors 2 vorgesehen werden. Im Allgemeinen wirkt die Bodenplatte 4 des Piezoaktors 2 auf ein Stellelement für das Servoventil des Kraftstoffinjektors ein. Piezoaktor 2 und Stellelement bilden den Stellantrieb für das Servoventil.Instead of the transmission element 5 shown, a hydraulic ratio of the stroke of the piezoelectric actuator 2 may be provided. In general, the bottom plate 4 of the piezoelectric actuator 2 acts on an actuator for the servo valve of the fuel injector. Piezo actuator 2 and actuator form the actuator for the servo valve.

Beim Abheben des Ventilelements 7 von seinem Sitz, das heißt beim Öffnen des Servoventils, kann auf die bekannte Weise (siehe z.B. das eingangs genannte US-Patent 5 779 149 ) Kraftstoff aus der Steuerkammer des im Kraftstoffinjektor enthaltenen Einspritzventils am Ventilelement 7 vorbei abfließen, wodurch sich der Druck in der Steuerkammer verringert und das Einspritzventil öffnet.When lifting the valve element 7 from its seat, that is, when opening the servo valve, can in the known manner (see, for example, the above-mentioned U.S. Patent 5,779,149 ) Fuel from the control chamber of the injector contained in the fuel injector flow past the valve element 7 over, whereby the pressure in the control chamber decreases and the injection valve opens.

Bei einer Beendigung der Ansteuerung des Piezoaktors 2 und der Rückkehr von Übertragungselement 5 und Ventilstößel 6 in die Ausgangsstellung wird das Ventilelement 7 des Servoventils von der Feder 8 wieder in seinen Sitz gedrückt, so dass sich in der Folge der Druck in der Steuerkammer des Einspritzventils wieder erhöht und das Einspritzventil schließt.Upon completion of the actuation of the piezoelectric actuator 2 and the return of the transmission element 5 and valve stem 6 in the starting position, the valve element 7 of the servo valve is pressed by the spring 8 back into its seat, so that in the sequence of pressure in the control chamber of the injection valve again increases and the injection valve closes.

Zwischen dem Gehäuse 3 des Piezoaktors 2 und dem Gehäuse 1 des Kraftstoffinjektors befindet sich ein Ausgleichsring 9.Between the housing 3 of the piezoelectric actuator 2 and the housing 1 of the fuel injector is a compensation ring. 9

Bei der Ansteuerung des Piezoaktors 2 bewegt sich somit die Bodenplatte 4 des Piezoaktors relativ zu dessen Gehäuse 3, das im Einbauzustand fest in das Gehäuse 1 des Kraftstoffinjektors eingeschraubt ist. Das Übertragungselement 5, das ein mechanischer Hebelübersetzer oder ein hydraulischer Übersetzer sein kann, überträgt diese Bewegung verstärkt auf den Ventilstößel 6, der das Ventilelement 7 des Servoventils betätigt.When driving the piezoelectric actuator 2 thus the base plate 4 of the piezoelectric actuator moves relative to the housing 3, which is screwed firmly in the installed state in the housing 1 of the fuel injector. The transmission element 5, which may be a mechanical lever translator or a hydraulic translator, transmits this movement increasingly to the valve stem 6, which actuates the valve element 7 of the servo valve.

Zur Einstellung eines definierten Leerhubes Δh im Stellantrieb aus Piezoaktor 2, Übertragungselement 5 und Ventilstößel 6 wird der Piezoaktor 2 vor dem Einbau in das Injektorgehäuse 1 so bearbeitet, dass die Bodenplatte 4 um genau den vorgegebenen Leerhub Δh gegenüber dem Gehäuse 3 des Piezoaktors zurücksteht. Dazu wird an den Piezoaktor 2 vor dem Einbau in das Injektorgehäuse 1 genau die Spannung U angelegt, die eine Längsdehnung der Piezoelementanordnung entsprechend dem vorgegebenen Leerhub Δh bewirkt, und es werden das Gehäuse 3 und die Bodenplatte 4 des Piezoaktors 2 bei angelegter Spannung U plangeschliffen.To set a defined idle stroke .DELTA.h in the actuator of piezoelectric actuator 2, transmission element 5 and valve tappet 6, the piezoelectric actuator 2 is machined prior to installation in the injector 1 so that the bottom plate 4 by exactly the predetermined idle stroke .DELTA.h is opposite to the housing 3 of the piezoelectric actuator. For this purpose, exactly the voltage U is applied to the piezoelectric actuator 2 prior to installation in the injector housing 1, which causes a longitudinal expansion of the piezoelectric element assembly according to the predetermined idle stroke .DELTA.h, and it will be the housing 3 and the bottom plate 4 of the piezoelectric actuator 2 ground plane with applied voltage U.

Der Piezoaktor 2 kann dazu zum Beispiel in eine Schleifmaschine eingespannt werden, wobei die Spannung U über Schleifringe zugeführt wird.The piezoelectric actuator 2 can be clamped for example in a grinding machine, wherein the voltage U is supplied via slip rings.

Nach dem Schleifvorgang und nach Wegnahme der Spannung U steht dann die Bodenplatte 4 um den vorgegebenen Leerhub Δh gegenüber dem Gehäuse 3 des Piezoaktors 2 zurück.After the grinding process and after removing the voltage U, the bottom plate 4 is then back by the predetermined idle stroke Δh with respect to the housing 3 of the piezoelectric actuator 2.

Die Herstellungs- und sonstigen Toleranzen seitens des Kraftstoffinjektors werden durch den Ausgleichsring 9 ausgeglichen.The manufacturing and other tolerances on the part of the fuel injector are compensated by the compensation ring 9.

Der Ausgleichsring 9, der aus einem weichen, verformbaren Material wie Weicheisen oder weichem Kupfer besteht, wird in den bis auf den Piezoaktor 2 komplett zusammengebauten Kraftstoffinjektor eingelegt. Dann wird anstelle des Piezoaktors 2 eine Vorspanneinrichtung in den Kraftstoffinjektor eingeschraubt, deren Vorderseite, die der Seite des Piezoaktors 2 mit der Bodenplatte 4 entspricht, vollständig plan ist. Die Vorspanneinrichtung wird so weit eingeschraubt, bis aufgrund der Betätigung des Übertragungselements 5 durch die plane Vorderseite der Vorspanneinrichtung das Ventilelement 7 des Servoventils von seinem Ventilsitz abzuheben beginnt. Dabei wird der aus einem weichen Material bestehende Ausgleichsring 9, auf den ebenfalls die plane Vorderseite der Vorspanneinrichtung einwirkt, durch Materialfließen dauerhaft verformt. Der Ausgleichsring 9 behält dann beim Entfernen der Vorspanneinrichtung die Dicke, die er hatte, als die Vorspanneinrichtung gerade so weit eingeschraubt war, dass sich das Servoventil zu öffnen begann.The compensation ring 9, which consists of a soft, deformable material such as soft iron or soft copper, is inserted into the fuel injector, which is completely assembled except for the piezoelectric actuator 2. Then, instead of the piezoelectric actuator 2, a biasing device is screwed into the fuel injector whose front side, which corresponds to the side of the piezoelectric actuator 2 with the bottom plate 4, is completely flat. The biasing device is screwed in until, due to the actuation of the transmission element 5 by the planar front of the biasing device, the valve element 7 of the servo valve begins to lift off its valve seat. In this case, consisting of a soft material compensation ring 9, which also acts on the flat front of the biasing device, permanently deformed by material flow. The balance ring 9 then retains the thickness it had when the pretensioner was screwed in so far that the servo valve began to open upon removal of the pretensioner.

Wird schließlich anstelle der Vorspanneinrichtung der Piezoaktor 2, dessen Bodenplatte 4 wie oben beschrieben um den vorgegebenen Leerhub Δh zurücksteht, bis zum Anschlag in das Gehäuse 1 des Kraftstoffinjektors eingeschraubt, das heißt bis zur Anlage des Piezoaktorgehäuses 3 am Ausgleichsring 9, so befindet sich die Vorderkante des Piezoaktorgehäuses 3 genau auf der Höhe, die die Vorderseite der Vorspanneinrichtung hatte, als sich das Servoventil zu öffnen begann. Da demgegenüber im spannungslosen Zustand die Bodenplatte 4 des Piezoaktors 2 um den vorgegebenen Leerhub Δh zurücksteht, entspricht der Leerhub des Stellantriebs im Kraftstoffinjektor, das heißt das Spiel zwischen Bodenplatte 4 des Piezoaktors 2 und Servoventil, genau dem vorgegebenen Wert Δh.Finally, if instead of the pretensioning device the piezoactuator 2, whose bottom plate 4 is retarded by the given idle stroke Δh, is screwed into the housing 1 of the fuel injector as far as it will go, ie until the piezoactuator housing 3 abuts the compensation ring 9, then the leading edge is located of the piezo actuator housing 3 exactly at the height that had the front of the biasing device when the servo valve began to open. In contrast, in the de-energized state, the bottom plate 4 of the piezoelectric actuator 2 is set back by the predetermined idle stroke .DELTA.h corresponds the idle stroke of the actuator in the fuel injector, that is the game between bottom plate 4 of the piezoelectric actuator 2 and servo valve, exactly the predetermined value .DELTA.h.

Bei einer alternativen Vorgehensweise wird der Piezoaktor 2 vor dem Einbau in das Injektorgehäuse 1 so bearbeitet, dass die Bodenplatte 4 und das Gehäuse 3 des Piezoaktors 2 im einbaufertigen Zustand, aber ohne anliegende Spannung plan geschliffen werden. Die Bodenplatte 4 des Piezoaktors 2 befindet sich somit nacht dem Schleifvorgang auf genau der gleichen Höhe wie das Gehäuse 3 des Piezoaktors 2. Dafür weist die Vorspanneinrichtung zur Verformung des Ausgleichsrings 9 keine plane Vorderseite, sondern eine Vorderseite auf, die an der oder den Stellen, an der oder denen die Vorspanneinrichtung auf das Übertragungselement 5 einwirkt, eine Erhebung der Höhe Δh besitzt.In an alternative approach, the piezoelectric actuator 2 is processed prior to installation in the injector 1 so that the bottom plate 4 and the housing 3 of the piezoelectric actuator 2 in the ready-to-install state, but ground without applied voltage. The bottom plate 4 of the piezoelectric actuator 2 is thus at the same height as the housing 3 of the piezoactuator 2 at night. For this purpose, the pretensioning device 9 does not have a plane front side, but rather a front side, which is in contact with the one or more points. at which or the biasing means acts on the transmission element 5, a survey of the height .DELTA.h has.

Die zentrale Wirkfläche an der Vorspanneinrichtung, die mit dem Übertragungselement 5 in Eingriff kommt, steht mit anderen Worten in Einbaurichtung um den vorgegebenen Wert Δh für den Leerhub gegenüber der am Rand umlaufenden Wirkflache vor, die mit dem Ausgleichsring 9 in Eingriff kommt.The central effective surface on the biasing device, which engages with the transmission element 5, is in other words in the installation direction by the predetermined value .DELTA.h for the idle stroke against the peripheral edge of the active surface, which comes into engagement with the balance ring 9.

Die Vorspanneinrichtung wird wie bei der erstgenannten Ausführungsform anstelle des Piezoaktors 2 so weit in den Kraftstoffinjektor eingeschraubt, bis durch die Betätigung des Übertragungselements 5 durch den erhabenen Abschnitt an der Vorderseite der Vorspanneinrichtung das Ventilelement 7 des Servoventils zu öffnen beginnt. Der Ausgleichsring 9 wird dabei wie oben bleibend verformt. Anschließend wird statt der Vorspanneinrichtung der Piezoaktor 2, bei dem Gehäuse 3 und Bodenplatte 4 ohne anliegende Spannung plan geschliffen wurden, bis zum Anschlag am Ausgleichsring 9 in das Gehäuse 1 des Kraftstoffinjektors eingeschraubt.The biasing means is screwed as far as in the fuel injector instead of the piezoelectric actuator 2 as in the first-mentioned embodiment until the actuation of the transmission element 5 by the raised portion on the front of the biasing means, the valve element 7 of the servo valve begins to open. The compensation ring 9 is thereby deformed as above permanently. Subsequently, instead of the biasing device of the piezoelectric actuator 2, were ground flat in the case 3 and bottom plate 4 without voltage applied, screwed into the housing 1 of the fuel injector to the stop on the balance ring 9.

Auch bei dieser Ausführungsform weist der Leerhub zwischen Piezoaktor 2 und Servoventil genau den vorgegebenen Wert Δh auf, da die Dicke des Ausgleichsrings 9 mit der Vorspanneinrichtung so eingestellt wird, dass sich beim Betrieb des Kraftstoffinjektors das Servoventil erst zu öffnen beginnt, nachdem die Bodenplatte 4 des Piezoaktors 2 bei dessen Ansteuerung den Leerweg Δh zurückgelegt hat.Also in this embodiment, the idle stroke between the piezoelectric actuator 2 and servo valve exactly the predetermined value .DELTA.h on, since the thickness of the balancing ring 9 is set with the biasing means so that the servo valve begins to open during operation of the fuel injector after the bottom plate 4 of the piezoelectric actuator 2 has covered the free travel .DELTA.h when it is driven.

Claims (6)

  1. Method for positioning the actuating drive in the housing of a fuel injector (1) with a piezoactuator (2) and an actuating element (5, 6, 7) which are operatively connected with each other, wherein the piezoactuator (2) is inserted in a movable manner into a housing (3) and has a base plate (4) which is allocated to an opening in the housing (3), characterised by
    a grinding flat of the housing (3) and the base plate (4) of the piezoactuator (2);
    providing an equalising ring (9) between the fuel injector (1) and the housing (3) of the piezoactuator (2) which by means of a pretensioning device which corresponds to a predetermined idle travel (Δh), is plastically deformed with a front side having a central raised area until it has the thickness at which the actuating element (5, 6, 7) starts to open because of the action of the raised front side of the pretensioning device.
  2. Method for positioning the actuating drive in the housing of a fuel injector (1) with a piezoactuator (2) and an actuating element (5, 6, 7) which are operatively connected with each other, wherein the piezoactuator (2) is inserted in a movable manner into a housing (3) and has a base plate (4) which is allocated to an opening in the housing (3), characterised by
    a device for grinding flat the housing (3) and the base plate (4) of the piezoactuator (2);
    a pre-tensioning device with a front side having a central raised part which corresponds to a given idle travel (Δh), for plastically deforming an equalising ring (9) between the housing of the fuel injector (1) and the housing (3) of the piezoactuator (2) until it has the thickness at which the actuating element (5, 6, 7) starts to open because of the action of the front side of the pretensioning device.
  3. Device according to claim 2, characterised in that the equalising ring (9) is inserted between two flat surfaces and by pressing together the two surfaces is plastically deformed to a given thickness.
  4. Device according to claim 2 or 3,
    characterised in that the equalising ring (9) consists of a flowable material in which case, on pressing together the equalising ring, the material of the equalising ring starts flowing and is therefore permanently plastically deformed.
  5. Device according to claim 4, characterised in that the equalising ring (9) consists of soft iron or a copper.
  6. Fuel injector with a piezoactuator (2) and an actuating element (5, 6, 7) which are operatively connected with each other, wherein the piezoactuator (2) is inserted in a movable manner into a housing (3) and has a base plate (4) which is allocated to an opening in the housing (3),
    characterised in that
    the base plate (4) of the piezoactuator (2) which is operatively connected to the actuating element (5, 6, 7), has been arranged in the no-voltage state at the level of the front edge of the housing (3) and
    an equalising ring (9) is formed between the housing of the fuel injector (1) and the housing (3) of the piezoactuator (2) and is plastically deformed in such a way that the actuating element (5, 6, 7, 8) has been moved back by a given idle travel distance (Δh) from the front edge of the equalisation ring (9).
EP20040026927 1999-05-07 2000-05-04 Method of positioning an actuator of a fuel injector and apparatus to carry out the method Expired - Lifetime EP1505295B1 (en)

Applications Claiming Priority (3)

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DE1999121242 DE19921242C1 (en) 1999-05-07 1999-05-07 Method of positioning control drive in common rail fuel injector for motor vehicle internal combustion engine
DE19921242 1999-05-07
EP20000943547 EP1144841B1 (en) 1999-05-07 2000-05-04 Method for positioning the actuating drive in a fuel injector and device for implementing said method

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US6705587B1 (en) 2004-03-16
US20080011972A1 (en) 2008-01-17
EP1144841A2 (en) 2001-10-17
DE50010750D1 (en) 2005-08-25
US8720852B2 (en) 2014-05-13
US20040256499A1 (en) 2004-12-23
EP1144841B1 (en) 2005-07-20
WO2000068563A3 (en) 2001-07-19
EP1505295A1 (en) 2005-02-09
DE19921242C1 (en) 2000-10-26
US7310986B2 (en) 2007-12-25
DE50015988D1 (en) 2010-10-21
WO2000068563A2 (en) 2000-11-16

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