EP1071878A1 - Injector with a multilayer piezoelectric actuator - Google Patents

Injector with a multilayer piezoelectric actuator

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Publication number
EP1071878A1
EP1071878A1 EP00907429A EP00907429A EP1071878A1 EP 1071878 A1 EP1071878 A1 EP 1071878A1 EP 00907429 A EP00907429 A EP 00907429A EP 00907429 A EP00907429 A EP 00907429A EP 1071878 A1 EP1071878 A1 EP 1071878A1
Authority
EP
European Patent Office
Prior art keywords
injector
actuator body
circular cylindrical
plate spring
valve
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.)
Granted
Application number
EP00907429A
Other languages
German (de)
French (fr)
Other versions
EP1071878B1 (en
Inventor
Friedrich Boecking
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1071878A1 publication Critical patent/EP1071878A1/en
Application granted granted Critical
Publication of EP1071878B1 publication Critical patent/EP1071878B1/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
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to an injector with a piezo multilayer actuator, in particular for "common rail”.
  • Diesel injection systems of motor vehicles which has a multi-layer actuator body which is seated within a longitudinal bore of an injector housing and is preloaded on the face side by preloading means.
  • FIG. 1 shows the section of the known injector lying around the actuator body.
  • the means prestressing the actuator body 1 consist of a valve-side disc spring 4 which, on the one hand, abuts or engages an annular flange 3 located on the valve-side end face of the actuator body 1 and, on the other hand, a radially inwardly projecting shoulder 5 of the injector housing 2. In this case it forms
  • Injector housing 2 itself the means for transmitting the biasing force exerted by the plate spring 4 to the other end face of the actuator body 1.
  • the arrow V indicates the direction to the valve. Due to the diameter of the plate spring 4 serving as a biasing element, the
  • an actuator body 1 seated centrally within an injector housing 2 is preloaded on the end face by a pretensioning bracket 6 with a right and left spring leg 6a, 6b by means of a first force-centering pressure element 7 and a second force-centering pressure element 8. Since the two legs 6a, 6b of the pretensioning bracket 6 require space to the left and right of the injector body 1, the outer diameter of the injector housing 2 cannot be reduced in the critical area in this case either.
  • the diameter of the components in the area of the actuator body must be chosen to be as small as possible.
  • An essential aspect of an injector according to the invention with a piezo multilayer actuator consists in that the prestressing means have at least one disc spring, which acts in a prestressing manner on the end face of the actuator body opposite an injector valve, and a force transmission element which is seated in the injector housing and is axially movable therein and which has the spring force of the disc spring ( n) transfers to the valve-side end of the actuator body.
  • the actuator body preferably has a circular cylindrical cross-sectional shape.
  • the sleeve-shaped injector housing has a circular cylindrical inner and outer contour at least in the area of the actuator body and surrounds the actuator body and the force transmission member, which forms a circular cylindrical clamping sleeve, the actuator body abutting a valve-side inner wall of this clamping sleeve and the plate springs between the opposite end face Attack the inner wall of the adapter sleeve and the adjacent face of the actuator body.
  • the biasing spring (s) causing the bias is behind, ie. H. provided on the side of the actuator body facing away from the valve, so that a narrow construction of the injector in the area of the actuator body is made possible.
  • the thicker actuator head with the plate spring or the plate springs is in the uncritical area of the cylinder head of the internal combustion engine.
  • Diesel injection injectors can be manufactured with piezo multi-layer actuators that are no longer than conventional solenoid valve injectors.
  • FIG. 1 shows in the form of a schematic longitudinal section the known injector already described with a valve-side pretensioning element designed as a plate spring.
  • FIG. 2 shows in the form of a schematic longitudinal section the other known injector already described, which contains a two-legged pretensioning bracket as the pretensioning element.
  • FIG. 3 shows a preferred exemplary embodiment of an injector according to the invention with a piezo multilayer actuator in the form of a schematic longitudinal section.
  • a cylindrical actuator body 10 of a piezo multilayer actuator which can have the form of a multilayer laminate composed of layers of piezoelectric material stacked on top of one another and metallic or electrically conductive layers serving as electrodes between them, is prestressed on the end face by means of prestressing means.
  • the biasing means consist of a plate spring assembly 14 and a cylindrical
  • Collet 11 which sit within a cylindrical injector housing 12.
  • the actuator body 10 of the piezo multilayer actuator ends on the end facing the valve V in a pressure bolt 16, which passes through a central bore 19 in the cylindrical clamping sleeve 11.
  • the opposite end to the valve The end face of the actuator body 10 ends in a support element 17, which in turn has a bolt-shaped end that projects through a central bore 20 of the clamping sleeve 11 and abuts there against a radial inner wall of the injector housing 12.
  • Preloading means d. H. the plate spring assembly 14 and the clamping sleeve 11 clamped end faces.
  • the clamping sleeve 11 which is seated in the central longitudinal bore 18 of the injector housing 12, moves together with the valve-side end, ie. H. with the pressure pin 16 of the actuator in the axial
  • the injector housing 12 in the section which is opposite the valve-side end of the actuator body 10, i. H. where the plate spring assembly 14 is located and the clamping sleeve 11 also form circular cylindrical radial extensions 15 and 13 within this section.
  • the plate springs of the plate spring assembly 14 can have a diameter sufficient for a desired spring force.
  • the embodiment according to the invention described above with reference to FIG. 3 offers an injector with a piezo multilayer actuator, since the prestressing element, i. H. the plate spring assembly 14 behind the actuator body 10, d. H. is at a position facing away from the valve side of the actuator body 10, a narrow construction of the injector in the area of the relatively long piezoelectric actuator body 10, the thicker head of which with the plate spring assembly 14 is in the uncritical area of the cylinder head of the internal combustion engine.
  • designs of an injector equipped with a piezo multilayer actuator are possible which are no longer than conventional solenoid valve injectors.

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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 invention relates to an injector, especially for a common rail diesel injection system of a motor vehicle. Said injector comprises a multilayer piezoelectric actuator with an actuator body (10) which is located inside a middle longitudinal bore (18) of an injector housing (12) and which is pre-stressed by pre-stressing means (11, 14) at the front of said housing. The injector is characterized in that the pre-stressing means (11, 14) are provided with at least one disk spring (14), which acts upon the front face of the actuator body (10) opposite the injector valve (V) and pre-stresses it, and a power transmission element (11) which is located inside the injector housing (12) and which is axially movable therein. Said power transmission element transmits the spring force of the disk spring(s) (14) to the front face of the actuator body (10) facing the valve.

Description

Injektor mit einem Piezo-MehrlacrenaktorInjector with a piezo multi-lacquer actuator
Stand der TechnikState of the art
Die Erfindung betrifft einen Injektor mit einem Piezo- Mehrlagenaktor insbesondere für "Common-Rail" -The invention relates to an injector with a piezo multilayer actuator, in particular for "common rail".
Dieseleinspritzsysteme von Kraftfahrzeugen, der einen innerhalb einer Längsbohrung eines Injektorgehäuses sitzenden durch Vorspannmittel stirnseitig vorgespannten mehrlagigen Aktorkörper auf eist.Diesel injection systems of motor vehicles, which has a multi-layer actuator body which is seated within a longitudinal bore of an injector housing and is preloaded on the face side by preloading means.
Aus WO 94/19598 (Siemens AG) ist ein solcher Injektor mit einem Piezo-Mehrlagenaktor bekannt. Die beiliegende Figur 1 zeigt den um den Aktorkörper herum liegenden Abschnitt des bekannten Injektors. Die den Aktorkörper 1 vorspannenden Mittel bestehen bei dem bekannten Injektor aus einer ventilseitigen Tellerfeder 4, die einerseits an einem an der ventilseitigen Stirnseite des Aktorkörpers 1 befindlichen Ringflansch 3 und andererseits an einer radial nach innen einspringenden Schulter 5 des Injektorgehäuses 2 anliegt bzw. angreift. In diesem Fall bildet dasSuch an injector with a piezo multilayer actuator is known from WO 94/19598 (Siemens AG). The accompanying FIG. 1 shows the section of the known injector lying around the actuator body. In the known injector, the means prestressing the actuator body 1 consist of a valve-side disc spring 4 which, on the one hand, abuts or engages an annular flange 3 located on the valve-side end face of the actuator body 1 and, on the other hand, a radially inwardly projecting shoulder 5 of the injector housing 2. In this case it forms
Injektorgehäuse 2 selbst das Mittel zur Übertragung der von der Tellerfeder 4 ausgeübten Vorspannkraft zur anderen Stirnseite des Aktorkörpers 1. Der Pfeil V deutet die Richtung zum Ventil an. Bedingt durch den Durchmesser der als Vorspannelement dienenden Tellerfeder 4 ist derInjector housing 2 itself the means for transmitting the biasing force exerted by the plate spring 4 to the other end face of the actuator body 1. The arrow V indicates the direction to the valve. Due to the diameter of the plate spring 4 serving as a biasing element, the
Außendurchmesser des Injektorgehäuses 2 dort, wo er am kritischsten ist, d. h., wo das Injektorgehäuse durch eine Zylinderkopf and geht, verhältnismäßig groß.Outside diameter of the injector housing 2 where it is most critical, ie where the injector housing by a Cylinder head and goes, relatively large.
Ähnliches gilt auch für den anderen, in der beiliegenden Figur 2 dargestellten bekannten "Common-Rail" - Dieselinjektor . Ein innerhalb eines Injektorgehäuses 2 zentrisch sitzende Aktorkörper 1 ist bei dem in Figur 2 gezeigten bekannten Injektor durch einen Vorspannbügel 6 mit einem rechten und linken Federschenkel 6a, 6b mittels eines ersten kraftzentrierenden Druckglieds 7 und eines zweiten kraftzentrierenden Druckglieds 8 stirnseitig vorgespannt. Da die beiden Schenkel 6a, 6b des Vorspannbügels 6 Platz links und rechts vom Injektorkörper 1 benötigen, kann auch in diesem Fall der Außendurchmesser des Injektorgehäuses 2 im kritischen Bereich nicht verkleinert werden.The same applies to the other known "common rail" diesel injector shown in the attached FIG. 2. In the known injector shown in FIG. 2, an actuator body 1 seated centrally within an injector housing 2 is preloaded on the end face by a pretensioning bracket 6 with a right and left spring leg 6a, 6b by means of a first force-centering pressure element 7 and a second force-centering pressure element 8. Since the two legs 6a, 6b of the pretensioning bracket 6 require space to the left and right of the injector body 1, the outer diameter of the injector housing 2 cannot be reduced in the critical area in this case either.
Somit ergibt sich, daß die bei bisher üblichen "Common- Rail " -Injektoren verwendeten Vorspannelemente den Durchmesser des Injektors im Bereich des Piezoaktors uner- wünscht erhöhen.It follows that the pretensioning elements used in conventional "common rail" injectors undesirably increase the diameter of the injector in the region of the piezo actuator.
Um einen "Common-Rail" -Dieselinjektor mit Piezo- Mehrlagenaktor in kurzer Bauform darstellen zu können, muß der Durchmesser der Bauelemente im Bereich des Aktorkörpers möglichst klein gewählt werden.In order to be able to represent a "common rail" diesel injector with a piezo multilayer actuator in a short design, the diameter of the components in the area of the actuator body must be chosen to be as small as possible.
Aufgabe und Vorteile der ErfindungObject and advantages of the invention
Es ist somit Aufgabe der Erfindung, einen für "Common- Rail" -Dieseleinspritzsysteme von Kraftfahrzeugen besser geeigneten Injektor mit einem Piezo-Mehrlagenaktor in kurzer Bauform zu ermöglichen, bei dem der Außendurchmesser des Injektorgehäuses möglichst klein sein kann.It is therefore an object of the invention to enable an injector which is more suitable for "common rail" diesel injection systems of motor vehicles with a piezo multi-layer actuator in a short design, in which the outside diameter of the injector housing can be as small as possible.
Diese Aufgabe wird anspruchsgemäß gelöst Ein wesentlicher Aspekt eines erfindungsgemäßen Injektors mit Piezo-Mehrlagenaktor besteht darin, daß die Vorspannmittel wenigstens eine Tellerfeder, die an der einem Injektorventil entgegengesetzten Stirnseite des Aktorkörpers vorspannend angreift und ein in dem Injektorgehäuse sitzendes und darin axial bewegliches Kraftübertragungsglied aufweisen, welches die Federkraft der Tellerfeder (n) zur ventilseitigen Stirnseite des Aktorkörpers überträgt .This task is solved according to the requirements An essential aspect of an injector according to the invention with a piezo multilayer actuator consists in that the prestressing means have at least one disc spring, which acts in a prestressing manner on the end face of the actuator body opposite an injector valve, and a force transmission element which is seated in the injector housing and is axially movable therein and which has the spring force of the disc spring ( n) transfers to the valve-side end of the actuator body.
Bevorzugt hat der Aktorkörper eine kreiszylindrische Querschnittsform. In diesem Fall weist das hülsenförmge Injektorgehäuse wenigstens im Bereich des Aktorkörpers eine kreiszylindrische Innen- und Außenkontur auf und umgibt den Aktorkörper und das Kraftübertragungsglied, das eine kreiszylindrische Spannhülse bildet, wobei der Aktorkδrper an eine ventilseitige Innenwand dieser Spannhülse stößt und die Tellerfedern zwischen der gegenüberliegenden stirnseitigen Innenwand der Spannhülse und der benachbarten Stirnseite des Aktorkörpers angreifen.The actuator body preferably has a circular cylindrical cross-sectional shape. In this case, the sleeve-shaped injector housing has a circular cylindrical inner and outer contour at least in the area of the actuator body and surrounds the actuator body and the force transmission member, which forms a circular cylindrical clamping sleeve, the actuator body abutting a valve-side inner wall of this clamping sleeve and the plate springs between the opposite end face Attack the inner wall of the adapter sleeve and the adjacent face of the actuator body.
Somit ist bzw. sind die die Vorspannung bewirkende (n) Tellerfeder (n) hinter, d. h. an der vom Ventil abgewendeten Seite des Aktorkörpers vorgesehen, so daß eine schmale Bauweise des Injektors im Bereich des Aktorkörpers ermöglicht ist. D. h., daß der dickere Aktorkopf mit der Tellerfeder oder den Tellerfedern im unkritischen Bereich des Zylinderkopfs des Verbrennungsmotors liegt.Thus, the biasing spring (s) causing the bias is behind, ie. H. provided on the side of the actuator body facing away from the valve, so that a narrow construction of the injector in the area of the actuator body is made possible. This means that the thicker actuator head with the plate spring or the plate springs is in the uncritical area of the cylinder head of the internal combustion engine.
Mit dieser Anordnung sind relativ kurze "Common-Rail" -With this arrangement, relatively short "common rail"
Dieseleinspritzinjektoren mit Piezo-Mehrlagenaktor herstellbar, die nicht länger als die herkömmlichen Magnetventil -Injektoren sind.Diesel injection injectors can be manufactured with piezo multi-layer actuators that are no longer than conventional solenoid valve injectors.
Die obigen und weitere vorteilhafte Merkmale des erfindungsgemäßen Injektors werden in der nachstehenden Beschreibung eines bevorzugten Ausführungsbeispiels noch deutlicher, wenn diese Beschreibung zusammen mit den beiliegenden Zeichnungen gelesen wird.The above and further advantageous features of the injector according to the invention are described in the following Description of a preferred embodiment will be more apparent when this description is read in conjunction with the accompanying drawings.
Zeichnungdrawing
Die Figur 1 zeigt in Form eines schematischen Längsschnitts den bereits beschriebenen bekannten Injektor mit einem als Tellerfeder ausgeführten ventilseitigen Vorspannelement.FIG. 1 shows in the form of a schematic longitudinal section the known injector already described with a valve-side pretensioning element designed as a plate spring.
Figur 2 zeigt in Form eines schematischen Längsschnitts den anderen bereits beschriebenen bekannten Injektor, der als Vorspannelement einen zweischenkligen Vorspannbügel enthält .FIG. 2 shows in the form of a schematic longitudinal section the other known injector already described, which contains a two-legged pretensioning bracket as the pretensioning element.
Figur 3 z.ϊigt in Form eines schematischen Längsschnitts ein bevorzugtes Ausführungsbeispiel eines erfindungsgemäßen Injektors mit Piezo-Mehrlagenaktor.FIG. 3 shows a preferred exemplary embodiment of an injector according to the invention with a piezo multilayer actuator in the form of a schematic longitudinal section.
AusführungsbeispielEmbodiment
In Figur 3 ist ein zylindrischer Aktorkörper 10 eines Piezo-Mehrlagenaktors, der die Form eines vielschichtigen Laminats aus aufeinandergeschichteten Lagen piezoelektrischen Materials und dazwischenliegenden metallischen bzw. elektrisch leitenden als Elektroden dienenden Schichten haben kann, durch Vorspannmittel stirnseitig vorgespannt. Die Vorspannmittel bestehen aus einem Tellerfederpaket 14 und einer zylindrischenIn FIG. 3, a cylindrical actuator body 10 of a piezo multilayer actuator, which can have the form of a multilayer laminate composed of layers of piezoelectric material stacked on top of one another and metallic or electrically conductive layers serving as electrodes between them, is prestressed on the end face by means of prestressing means. The biasing means consist of a plate spring assembly 14 and a cylindrical
Spannhülse 11, die innerhalb eines zylindrischen Injektorgehäuses 12 sitzen. Der Aktorkörper 10 des Piezo- Mehrlagenaktors endet an der zum Ventil V weisenden Stirnseite in einem Druckbolzen 16, der dort durch eine zentrische Bohrung 19 in der zylindrischen Spannhülse 11 geht. Die dem ventilseitigen Ende entgegengesetzte Stirnseite des Aktorkörpers 10 endet in einem Abstützelement 17, welches seinerseits ein bolzenförmiges Ende hat, das durch eine zentrische Bohrung 20 der Spannhülse 11 ragt und dort an einer radialen Innenwand des Injektorgehäuses 12 anstößt.Collet 11, which sit within a cylindrical injector housing 12. The actuator body 10 of the piezo multilayer actuator ends on the end facing the valve V in a pressure bolt 16, which passes through a central bore 19 in the cylindrical clamping sleeve 11. The opposite end to the valve The end face of the actuator body 10 ends in a support element 17, which in turn has a bolt-shaped end that projects through a central bore 20 of the clamping sleeve 11 and abuts there against a radial inner wall of the injector housing 12.
Wenn eine pulsierende elektrische Spannung an die (nicht gezeigten) Elektroden des Aktorkörpers 10 angelegt wird, führt dieser analog pulsierende Hübe unter Änderung des Abstandes zwischen seinen durch die genanntenIf a pulsating electrical voltage is applied to the electrodes (not shown) of the actuator body 10, the latter performs analogous pulsating strokes with a change in the distance between them by the aforementioned
Vorspannmittel, d. h. das Tellerfederpaket 14 und die Spannhülse 11 eingespannten Stirnseiten aus. Dabei bewegt sich die in der Mittellängsbohrung 18 des Inj ektorgehäuses 12 sitzende Spannhülse 11 zusammen mit dem ventilseitigen Ende, d. h. mit dem Druckbolzen 16 des Aktors in axialerPreloading means, d. H. the plate spring assembly 14 and the clamping sleeve 11 clamped end faces. The clamping sleeve 11, which is seated in the central longitudinal bore 18 of the injector housing 12, moves together with the valve-side end, ie. H. with the pressure pin 16 of the actuator in the axial
Richtung V entgegen der vom Tellerfederpaket 14 ausgeübten Federkraft, da die Spannhulse 11 durch die Vorspannkraft des Tellerfederpakets 14 zwischen dem ventilseitigen Ende des Aktors und dem entgegengesetzt dazu liegenden Ende des Tellerfederpakets 14 eingespannt ist.Direction V against the spring force exerted by the plate spring assembly 14, since the clamping sleeve 11 is clamped between the valve-side end of the actuator and the opposite end of the plate spring assembly 14 by the pretensioning force of the plate spring assembly 14.
Es ist in Figur 3 deutlich zu erkennen, daß das Injektorgehäuse 12 in dem Abschnitt, der dem ventilseitigen Ende des Aktorkörpers 10 entgegengesetzt ist, d. h. dort, wo das Tellerfederpaket 14 sitzt und auch die Spannhülse 11 innerhalb dieses Abschnitts jeweils kreiszylindrische radiale Erweiterungen 15 und 13 bilden. Auf diese Weise können die Tellerfedern des Tellerfederpakets 14 einen für eine gewünschte Federkraft ausreichenden Durchmesser haben. Die axiale Länge der radialen Erweiterung 13 der SpannhülseIt can be clearly seen in FIG. 3 that the injector housing 12 in the section which is opposite the valve-side end of the actuator body 10, i. H. where the plate spring assembly 14 is located and the clamping sleeve 11 also form circular cylindrical radial extensions 15 and 13 within this section. In this way, the plate springs of the plate spring assembly 14 can have a diameter sufficient for a desired spring force. The axial length of the radial extension 13 of the adapter sleeve
11 ist um die Distanz d geringer als das axiale Innenmaß der radialen Erweiterung 15 des Inj ektorgehäuses 12, damit Platz für die oben erwähnte, durch die Aktorhübe bewirkte axiale Bewegung der Spannhulse 11 bleibt.11 is by the distance d less than the axial internal dimension of the radial extension 15 of the injector housing 12, so that there remains space for the above-mentioned axial movement of the clamping sleeves 11 caused by the actuator strokes.
Die durch das zwischen der Spannhülse 11 und der oberen Ringschulter des Abstützelements 17 zentrisch gelagerte Tellerfederpaket 14 und durch die gleichfalls zentrisch gelagerte und axial bewegliche Spannhülse 11 bewirkte Vorspannkraft macht weitere Zentriermittel für eine Zentrierung der Vorspannkraft am Aktorkörper 10 unnötig, wie sie der die zwei seitlichen Schenkel 6a, 6b aufweisende Federspannbügel 6 gemäß Figur 2 in Form der Druckglieder 7 und 8 braucht .The through the between the clamping sleeve 11 and the upper Annular shoulder of the support element 17, a centrally mounted plate spring assembly 14 and the biasing force caused by the likewise centrally mounted and axially movable clamping sleeve 11 make further centering means for centering the biasing force on the actuator body 10 unnecessary, as is the case with the two lateral legs 6a, 6b having the spring clip 6 according to FIG. 2 needs in the form of pressure members 7 and 8.
Insgesamt bietet die oben anhand der Figur 3 beschriebene erfindungsgemäße Ausführungsform eines Injektors mit Piezo- Mehrlagenaktor, da das Vorspannelement, d. h. das Tellerfederpaket 14 hinter dem Aktorkörper 10, d. h. an einer Position liegt, die von der Ventilseite des Aktorkörpers 10 abgewendet ist, eine schmale Bauweise des Injektors im Bereich des relativ langen piezoelektrischen Aktorkörpers 10, wobei dessen dickerer Kopf mit dem Tellerfederpaket 14 im unkritischen Bereich des Zylinderkopfs des Verbrennungsmotors liegt. Mit der erfindungsgemäßen vorgeschlagenen Anordnung sind Bauformen eines mit einem Piezo-Mehrlagenaktor ausgestatteten Injektors möglich, die nicht länger als herkömmliche Magnetventilinjektoren sind. Overall, the embodiment according to the invention described above with reference to FIG. 3 offers an injector with a piezo multilayer actuator, since the prestressing element, i. H. the plate spring assembly 14 behind the actuator body 10, d. H. is at a position facing away from the valve side of the actuator body 10, a narrow construction of the injector in the area of the relatively long piezoelectric actuator body 10, the thicker head of which with the plate spring assembly 14 is in the uncritical area of the cylinder head of the internal combustion engine. With the proposed arrangement according to the invention, designs of an injector equipped with a piezo multilayer actuator are possible which are no longer than conventional solenoid valve injectors.

Claims

Ansprüche Expectations
1. Injektor, insbesondere für "Common-Rail" -1. injector, especially for "common rail" -
Dieseleinspritzsysteme von Kraftfahrzeugen, mit einem Piezo-Mehrlagenaktor, der einen innerhalb einer Mittellängsbohrung (18) eines Inj ektorgehäuses (12) sitzenden, durch Vorspannmittel (11, 14) stirnseitig vorgespannten mehrlagigen Aktorkörper (10) aufweist, dadurch gekennzeichnet, daß die Vorspannmittel (11, 14) wenigstens eine Tellerfeder (14) , die an der einem Injektorventil (V) entgegengesetzten Stirnseite des Aktorkörpers (10) vorspannend angreift und ein in dem Injektorgehäuse (12) sitzendes und darin axial beweglichesDiesel injection systems of motor vehicles, with a piezo multi-layer actuator which has a multi-layer actuator body (10) seated within a central longitudinal bore (18) of an injector housing (12) and preloaded on the front side by pre-tensioning means (11, 14), characterized in that the pre-tensioning means (11 , 14) at least one plate spring (14), which acts on the end face of the actuator body (10) opposite an injector valve (V), and a spring which is seated in the injector housing (12) and axially movable therein
Kraftübertragungsglied (11) aufweisen, welches die Federkraft der Tellerfeder (n) (14) zur ventilseitigen Stirnseite des Aktorkörpers (10) überträgt.Have force transmission member (11) which transmits the spring force of the plate spring (s) (14) to the valve-side end face of the actuator body (10).
2. Injektor nach Anspruch 1, dadurch gekennzeichnet, daß der Aktorkörper (10) eine kreiszylindrische Querschnittsform hat.2. Injector according to claim 1, characterized in that the actuator body (10) has a circular cylindrical cross-sectional shape.
3. Injektor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Injektorgehäuse (12) hülsenförmig den Aktorkörper (10) und das Kraftübertragungsglied (11) umgibt und wenigstens im Bereich des Aktorkörpers (10) eine kreiszylindrische Innen- und Außenkontur hat.3. Injector according to claim 1 or 2, characterized in that the injector housing (12) surrounds the actuator body (10) and the force transmission member (11) in a sleeve shape and at least in the region of the actuator body (10) has a circular cylindrical inner and outer contour.
4. Injektor nach Anspruch 3, dadurch gekennzeichnet, daß das Kraftübertragungsglied (11) eine kreiszylindrische Spannhülse ist, wobei der Aktorkörper (10) an einer ventilseitigen radialen Innenwand der Spannhülse (11) anstößt und die Tellerfeder (n) (14) zwischen einer gegenüberliegenden radialen Innenwand der Spannhülse (11) und der benachbarten Stirnseite des Aktorkörpers (10) angreift bzw. angreifen.4. Injector according to claim 3, characterized in that the force transmission member (11) is a circular cylindrical Clamping sleeve, the actuator body (10) abuts a valve-side radial inner wall of the clamping sleeve (11) and the plate spring (s) (14) engages or engages between an opposite radial inner wall of the clamping sleeve (11) and the adjacent end face of the actuator body (10) attack.
5. Injektor nach Anspruch 4, dadurch gekennzeichnet, daß die Tellerfeder (n) (14) und die Stirnwände der Spannhülse (11) zentrische axiale Bohrungen (19, 20) haben, durch die jeweils ein Abstützelement (17) des Aktorkörpers (10) und ein vom Aktorkörper (10) zur Ventilseite (V) ragender Druckbolzen (16) gehen.5. Injector according to claim 4, characterized in that the plate spring (s) (14) and the end walls of the clamping sleeve (11) have central axial bores (19, 20), through each of which a support element (17) of the actuator body (10) and a pressure pin (16) projecting from the actuator body (10) to the valve side (V).
6. Injektor nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß das Injektorgehäuse (12) im Abschnitt der Tellerfeder (n) (14) eine radiale kreiszylindrische Erweiterung (15) bildet, daß die Spannhulse (11) dort eine in der kreiszylindrischen Erweiterung (15) des Injektorgehäuses (14) bewegliche kreiszylindrische radiale Erweiterung (13) hat, und daß die Tellerfeder (n) (14) einen Außendurchmesser größer als der Durchmesser des Aktorkörpers (10) haben und zentrisch in der kreiszylindrischen radialen Erweiterung (13) der Spannhülse (11) sitzt bzw. sitzen. 6. Injector according to one of claims 3 to 5, characterized in that the injector housing (12) in the portion of the plate spring (s) (14) forms a radial circular cylindrical extension (15) that the clamping sleeve (11) there in the circular cylindrical Extension (15) of the injector housing (14) has a movable circular cylindrical radial extension (13), and that the plate spring (s) (14) have an outer diameter larger than the diameter of the actuator body (10) and are centered in the circular cylindrical radial extension (13) the adapter sleeve (11) sits or sits.
EP00907429A 1999-02-16 2000-01-14 Injector with a multilayer piezoelectric actuator Expired - Lifetime EP1071878B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19906467 1999-02-16
DE19906467A DE19906467A1 (en) 1999-02-16 1999-02-16 Injector with piezo multilayer actuator in particular for common rail diesel injection system
PCT/DE2000/000122 WO2000049286A1 (en) 1999-02-16 2000-01-14 Injector with a multilayer piezoelectric actuator

Publications (2)

Publication Number Publication Date
EP1071878A1 true EP1071878A1 (en) 2001-01-31
EP1071878B1 EP1071878B1 (en) 2004-03-31

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EP00907429A Expired - Lifetime EP1071878B1 (en) 1999-02-16 2000-01-14 Injector with a multilayer piezoelectric actuator

Country Status (6)

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US (1) US6371085B1 (en)
EP (1) EP1071878B1 (en)
JP (1) JP2002537515A (en)
KR (1) KR20010042665A (en)
DE (2) DE19906467A1 (en)
WO (1) WO2000049286A1 (en)

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Also Published As

Publication number Publication date
WO2000049286A1 (en) 2000-08-24
DE19906467A1 (en) 2000-08-24
DE50005857D1 (en) 2004-05-06
US6371085B1 (en) 2002-04-16
JP2002537515A (en) 2002-11-05
KR20010042665A (en) 2001-05-25
EP1071878B1 (en) 2004-03-31

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