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EP3359800B1 - Actuator with valve unit for a piezo servo-operated injector - Google Patents

Actuator with valve unit for a piezo servo-operated injector Download PDF

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Publication number
EP3359800B1
EP3359800B1 EP16774945.6A EP16774945A EP3359800B1 EP 3359800 B1 EP3359800 B1 EP 3359800B1 EP 16774945 A EP16774945 A EP 16774945A EP 3359800 B1 EP3359800 B1 EP 3359800B1
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EP
European Patent Office
Prior art keywords
valve
actuator
actuator housing
housing
base plate
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EP16774945.6A
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German (de)
French (fr)
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EP3359800A1 (en
Inventor
Vincent Dian
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Vitesco Technologies GmbH
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Vitesco Technologies GmbH
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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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift

Definitions

  • the present invention relates to an actuator with a valve unit for a piezo servo-operated injector.
  • document WO 2015/125438 A shows an actuator housing, which consists of a sleeve and an actuator housing cover.
  • Such an actuator with a valve unit is known.
  • a valve With a standard piezo-servo-operated injector, a valve is acted upon against the existing pressure. The fact that the piezo element works against this pressure leads to a "digital" opening of the valve. As soon as the valve is opened, the pressure behind the valve decreases, so that the force exerted on the piezo element also decreases. This causes the valve to open further and the pressure continues to decrease.
  • each valve position is unstable, making it difficult to control the valve within a small valve displacement range (this is a key feature of realizing dynamic leakage without performing injections). This effect depends on the pressure. With a small pressure the effect is small, with a high pressure it is great.
  • the present invention is based on the object of an actuator with a valve unit for a piezo-servo-operated To provide an injector which is particularly simple and has an effective mode of operation.
  • the solution according to the invention makes it possible to control a valve unit such that it works with the pressure and no longer against the pressure, this control being carried out by a piezo actuator.
  • the reversal of the displacement of the valve element achieved according to the invention is achieved by the housing of the piezo element which, when the piezo element increases in length, moves the force transmission device against the second biasing element so that the valve element is lifted from the valve seat in the direction of the pressure applied.
  • the piezo element is supported on the permanently installed base plate and the top plate of the movable actuator housing, so that a corresponding movement of the actuator housing is initiated when the piezo element is elongated.
  • the actuator housing extends through the fixed base plate.
  • valve unit With such a configuration, the valve unit and thus the injector will open automatically if the pressure in the system increases too much. In this way, a pressure relief valve can be avoided.
  • This valve position is stable and enables pressure reduction by generating a dynamic leakage without injection.
  • a pressure control valve is not required.
  • the first pretensioning element which acts on the actuator housing against the valve opening direction, is located outside the actuator housing in this embodiment, which simplifies the construction of the actuator overall. According to the invention, a simple and efficient solution is thus proposed in which the valve unit works with the pressure.
  • the advantages of a typical solenoid valve (robustness, stability) are combined with the advantages of a typical piezo actuator. In this way, an injection system can be designed without a pressure relief valve or pressure control valve.
  • the actuator housing has an end facing the valve unit Opening through which the power transmission device extends and engages behind the inner wall of the actuator housing.
  • the force transmission device preferably comprises a valve piston, this valve piston in a special embodiment having an end flange that interacts with the inner wall of the actuator housing.
  • the actuator housing when the piezo element is elongated, the actuator housing is moved away from the valve unit and thereby moves the valve piston extending through its opening against the second biasing element so that the valve element can open due to the pressure applied. Conversely, when the valve element contracts, the actuator housing is moved in the direction of the valve unit, whereby the valve piston can press the valve element against its seat again due to the force of the second biasing element in order to close the valve unit.
  • the base plate provided according to the invention, through which the actuator housing extends, is preferably fixed to the outer housing of the actuator by a plurality of weld points.
  • the base plate can preferably be fixed to the outer housing via two or four attachments by welding points, between each of which a slot is formed.
  • the force transmission device comprises a lever device in order to enable the valve element to be acted upon accordingly.
  • the actuator with valve unit shown in longitudinal section has an outer housing 1 which forms an interior space in which an actuator housing 2 is arranged so as to be movable up and down.
  • a base plate 4 is welded into the outer housing 1, as indicated by the welds 5.
  • the in Figure 2 The horizontal section shown shows the bottom plate 4 in a top view, which is welded to the inner wall of the outer housing 1 via two attachments 12 via the welds 5. Between the two lugs 12, two semicircular slots 13 are formed in the base plate 4, through which the wall of the cylindrical actuator housing 2 extends. The actuator housing 2 can thus move up and down through the slots 13 of the base plate 4.
  • the actuator housing 2 is closed at its end facing away from the valve unit and has a head plate 14 there. At the opposite end, the actuator housing 2 has a central opening 6 through which a valve piston 7 extends, which has an end flange 15 arranged in the interior of the actuator housing 2. The end flange 15 engages behind the wall area of the actuator housing 2 arranged adjacent to the opening 6.
  • the valve piston 7 cooperates with a valve element 8 which cooperates with a valve seat 9.
  • the valve element 8 opens and closes a channel 16 through which fuel is supplied to an injection nozzle.
  • a piezo element 3 is arranged between the top plate 14 of the actuator housing 2 and the permanently installed base plate 4.
  • a first biasing element 11 in the form of a spring presses the actuator housing 3 in Figure 1 downward
  • a second biasing element 10 is arranged between the valve piston 7 and the bottom plate 4 and presses the valve piston 7 in the Figure 1 downwards against the valve element 8 and thus against the valve seat 9 in order to close the channel 16.
  • the actuator works in the following way: When the piezo element 3 is subjected to an electrical voltage, its length increases, whereby the actuator housing 14 against the biasing element 11 in the Figure 1 is moved upwards. As a result, the valve piston 7 is also moved upwards against the prestressing element 10, as a result of which the valve element 8 is lifted from the valve seat 9 and the channel 16 is opened. The valve unit thus works with the pressure present in channel 16 and not against it when the valve is opened.
  • the valve unit is therefore opened in the direction of the pressure applied with the aid of the actuator.
  • the valve piston 7 serving as a power transmission device is actuated by the actuator housing 2, specifically in the pressure direction, as mentioned above.

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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)

Description

Die vorliegende Erfindung betrifft einen Aktuator mit Ventileinheit für einen piezoservobetriebenen Injektor. Dokument WO 2015/125438 A zeigt ein Aktuatorgehäuse, welches aus einer Hülse und einem Aktuatorgehäusedeckel besteht.The present invention relates to an actuator with a valve unit for a piezo servo-operated injector. document WO 2015/125438 A shows an actuator housing, which consists of a sleeve and an actuator housing cover.

Ein solcher Aktuator mit Ventileinheit ist bekannt. Bei einem standardmäßigen piezoservobetriebenen Injektor wird ein Ventil gegen den vorhandenen Druck beaufschlagt. Die Tatsache, dass das Piezoelement gegen diesen Druck arbeitet, führt zu einem "digitalen" Öffnen des Ventils. Sobald das Ventil geöffnet ist, nimmt der Druck hinter dem Ventil ab, so dass auch die auf das Piezoelement ausgeübte Kraft abnimmt. Hierdurch öffnet sich das Ventil weiter und nimmt der Druck weiter ab. Hierbei ist jedoch jede Ventilposition unstabil bzw. unbeständig, so dass es schwierig wird, das Ventil in einem kleinen Ventilverschiebungsbereich zu steuern (hierbei handelt es sich um ein Schlüsselmerkmal zur Realisierung einer dynamischen Leckage ohne Durchführung von Einspritzungen). Dieser Effekt ist abhängig vom Druck. Bei einem kleinen Druck ist der Effekt gering, bei einem hohen Druck ist er groß.Such an actuator with a valve unit is known. With a standard piezo-servo-operated injector, a valve is acted upon against the existing pressure. The fact that the piezo element works against this pressure leads to a "digital" opening of the valve. As soon as the valve is opened, the pressure behind the valve decreases, so that the force exerted on the piezo element also decreases. This causes the valve to open further and the pressure continues to decrease. However, each valve position is unstable, making it difficult to control the valve within a small valve displacement range (this is a key feature of realizing dynamic leakage without performing injections). This effect depends on the pressure. With a small pressure the effect is small, with a high pressure it is great.

Aufgrund dieser Tatsache ist ein standardmäßiger piezobetriebener Injektor nicht in der Lage, einen Druckabfall im gesamten Druckbereich zu steuern. Diese Funktion muss von einer anderen Komponente ausgeführt werden.Due to this fact, a standard piezo-powered injector is unable to control a pressure drop over the entire pressure range. This function must be performed by another component.

Im Stand der Technik hat man hierzu ein spezielles Drucksteuerventil verwendet. Auch wurde ein Druckbegrenzungsventil in Kombination mit einer dynamischen Leckage ohne Einspritzung eingesetzt, jedoch nicht im gesamten Druckbereich. Bei einer derartigen Kombination muss die Pumpe die permanente Leckage auch während Einspritzungen kompensieren, was jedoch zu einem nicht optimierten Kraftstoffverbrauch führt.In the prior art, a special pressure control valve has been used for this purpose. A pressure relief valve was also used in combination with a dynamic leakage without injection, but not in the entire pressure range. With such a combination, the pump must also compensate for the permanent leakage during injections, which, however, leads to non-optimized fuel consumption.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Aktuator mit Ventileinheit für einen piezoservobetriebenen Injektor zur Verfügung zu stellen, der besonders einfach ausgebildet ist und dabei eine effektive Funktionsweise aufweist.The present invention is based on the object of an actuator with a valve unit for a piezo-servo-operated To provide an injector which is particularly simple and has an effective mode of operation.

Diese Aufgabe wird erfindungsgemäß durch einen Aktuator mit Ventileinheit für einen piezoservobetriebenen Injektor gelöst, der die folgenden Komponenten umfasst:

  • Ein einen Innenraum bildendes Außengehäuse,
  • eine sich durch den Innenraum des Außengehäuses erstreckende und hiermit verbundene feste Bodenplatte,
  • ein sich durch die Bodenplatte erstreckendes bewegliches Aktuatorgehäuse innerhalb des Außengehäuses,
  • ein zwischen der festen Bodenplatte und einer Kopfplatte des beweglichen Aktuatorgehäuses angeordnetes Piezoelement,
  • ein mit einem Ventilsitz zusammenwirkendes bewegliches Ventilelement,
  • eine Kraftübertragungseinrichtung zwischen Aktuatorgehäuse und beweglichem Ventilelement,
  • ein das Aktuatorgehäuse in Richtung auf das Ventilelement vorspannendes erstes Vorspannungselement und
  • ein die Kraftübertragungseinrichtung in Richtung auf das Ventilelement vorspannendes zweites Vorspannungselement,
  • wobei durch eine Längenvergrößerung des Piezoelementes das Aktuatorgehäuse gegen das erste Vorspannungselement und dadurch die Kraftübertragungseinrichtung gegen das zweite Vorspannungselement zum Abheben des Ventilelementes vom Ventilsitz bewegbar ist.
This object is achieved according to the invention by an actuator with a valve unit for a piezo servo-operated injector, which comprises the following components:
  • An outer housing forming an interior space,
  • a solid base plate that extends through the interior of the outer housing and is connected to it,
  • a movable actuator housing extending through the base plate within the outer housing,
  • a piezo element arranged between the fixed base plate and a head plate of the movable actuator housing,
  • a movable valve element cooperating with a valve seat,
  • a power transmission device between the actuator housing and the movable valve element,
  • a first biasing element biasing the actuator housing in the direction of the valve element and
  • a second prestressing element prestressing the force transmission device in the direction of the valve element,
  • wherein by increasing the length of the piezo element, the actuator housing can be moved against the first prestressing element and thereby the force transmission device can be moved against the second prestressing element in order to lift the valve element from the valve seat.

Die erfindungsgemäße Lösung ermöglicht es, eine Ventileinheit so zu steuern, dass sie mit dem Druck und nicht mehr gegen den Druck arbeitet, wobei diese Steuerung von einem Piezoaktuator durchgeführt wird. Die erfindungsgemäß erreichte Umkehrung der Verschiebung des Ventilelementes wird durch das Gehäuse des Piezoelementes erreicht, das bei einer Längenvergrößerung des Piezoelementes die Kraftübertragungseinrichtung gegen das zweite Vorspannungselement so bewegt, dass das Ventilelement in Richtung des anstehenden Druckes vom Ventilsitz abgehoben wird. Dabei stützt sich das Piezoelement auf der fest installierten Bodenplatte und der Kopfplatte des beweglichen Aktuatorgehäuses ab, so dass bei einer Auslängung des Piezoelementes eine entsprechende Bewegung des Aktuatorgehäuses initiiert wird. Das Aktuatorgehäuse erstreckt sich dabei durch die feste Bodenplatte hindurch.The solution according to the invention makes it possible to control a valve unit such that it works with the pressure and no longer against the pressure, this control being carried out by a piezo actuator. The reversal of the displacement of the valve element achieved according to the invention is achieved by the housing of the piezo element which, when the piezo element increases in length, moves the force transmission device against the second biasing element so that the valve element is lifted from the valve seat in the direction of the pressure applied. The piezo element is supported on the permanently installed base plate and the top plate of the movable actuator housing, so that a corresponding movement of the actuator housing is initiated when the piezo element is elongated. The actuator housing extends through the fixed base plate.

Mit einer derartigen Ausgestaltung öffnet sich die Ventileinheit und damit der Injektor von selbst, wenn der Druck im System zu stark ansteigt. Auf diese Weise kann ein Druckbegrenzungsventil vermieden werden. Diese Ventilposition ist stabil und ermöglicht eine Druckverringerung durch Erzeugung einer dynamischen Leckage ohne Einspritzung. Ein Drucksteuerventil wird nicht benötigt. Das erste Vorspannungselement, das das Aktuatorgehäuse entgegen der Ventilöffnungsrichtung beaufschlagt, befindet sich bei dieser Ausführungsform außerhalb des Aktuatorgehäuses, wodurch insgesamt die Konstruktion des Aktuators vereinfach wird. Erfindungsgemäß wird somit eine einfache und effiziente Lösung vorgeschlagen, bei der die Ventileinheit mit dem Druck arbeitet. Es werden die Vorteile eines typischen Solenoidventiles (Robustheit, Stabilität) mit den Vorteilen eines typischen Piezoaktuators kombiniert. Auf diese Weise kann ein Einspritzsystem ohne Druckbegrenzungsventil oder Drucksteuerventil konzipiert werden.With such a configuration, the valve unit and thus the injector will open automatically if the pressure in the system increases too much. In this way, a pressure relief valve can be avoided. This valve position is stable and enables pressure reduction by generating a dynamic leakage without injection. A pressure control valve is not required. The first pretensioning element, which acts on the actuator housing against the valve opening direction, is located outside the actuator housing in this embodiment, which simplifies the construction of the actuator overall. According to the invention, a simple and efficient solution is thus proposed in which the valve unit works with the pressure. The advantages of a typical solenoid valve (robustness, stability) are combined with the advantages of a typical piezo actuator. In this way, an injection system can be designed without a pressure relief valve or pressure control valve.

Erfindungsgemäß weist das Aktuatorgehäuse am der Ventileinheit zugewandten Ende eine Öffnung auf, durch die sich die Kraftübertragungseinrichtung erstreckt und die Innenwandung des Aktuatorgehäuses hintergreift. Dabei umfasst die Kraftübertragungseinrichtung vorzugsweise einen Ventilkolben, wobei dieser Ventilkolben bei einer speziellen Ausführungsform einen mit der Innenwandung des Aktuatorgehäuses zusammenwirkenden Endflansch besitzt.According to the invention, the actuator housing has an end facing the valve unit Opening through which the power transmission device extends and engages behind the inner wall of the actuator housing. The force transmission device preferably comprises a valve piston, this valve piston in a special embodiment having an end flange that interacts with the inner wall of the actuator housing.

Bei der vorstehend beschriebenen Ausführungsform wird bei einer Auslängung des Piezoelementes das Aktuatorgehäuse von der Ventileinheit wegbewegt und bewegt dabei den sich durch seine Öffnung erstreckenden Ventilkolben gegen das zweite Vorspannungselement, so dass das Ventilelement durch den anstehenden Druck öffnen kann. Umgekehrt wird bei einer Kontraktion des Ventilelementes das Aktuatorgehäuse in Richtung auf die Ventileinheit bewegt, wodurch der Ventilkolben aufgrund der Kraft des zweiten Vorspannungselementes das Ventilelement wieder gegen seinen Sitz pressen kann, um die Ventileinheit zu schließen. Die erfindungsgemäß vorgesehene Bodenplatte, durch die sich das Aktuatorgehäuse erstreckt, ist vorzugsweise durch mehrere Schweißpunkte am Außengehäuse des Aktuators fixiert. Dies erfolgt zweckmäßigerweise über Ansätze der Bodenplatte, so dass zwischen Bodenplatte und Außengehäuse Schlitze gebildet sind, durch die sich das Aktuatorgehäuse erstreckt und seine durch das Piezoelement initiierte Bewegung durchführen kann. Vorzugsweise sind das Außengehäuse und das darin angeordnete Aktuatorgehäuse zylindrisch ausgebildet, so dass die Schlitze als Rundschlitze ausgestaltet sind. Dabei kann die Bodenplatte vorzugsweise über zwei oder vier Ansätze durch Schweißpunkte am Außengehäuse fixiert sein, zwischen denen jeweils ein Schlitz ausgebildet ist.In the embodiment described above, when the piezo element is elongated, the actuator housing is moved away from the valve unit and thereby moves the valve piston extending through its opening against the second biasing element so that the valve element can open due to the pressure applied. Conversely, when the valve element contracts, the actuator housing is moved in the direction of the valve unit, whereby the valve piston can press the valve element against its seat again due to the force of the second biasing element in order to close the valve unit. The base plate provided according to the invention, through which the actuator housing extends, is preferably fixed to the outer housing of the actuator by a plurality of weld points. This is expediently carried out via projections on the base plate, so that slots are formed between the base plate and the outer housing, through which the actuator housing extends and can carry out its movement initiated by the piezo element. The outer housing and the actuator housing arranged therein are preferably cylindrical, so that the slots are configured as round slots. In this case, the base plate can preferably be fixed to the outer housing via two or four attachments by welding points, between each of which a slot is formed.

Erfindungsgemäß umfasst die Kraftübertragungseinrichtung eine Hebeleinrichtung, um eine entsprechende Beaufschlagung des Ventilelementes zu ermöglichen.According to the invention, the force transmission device comprises a lever device in order to enable the valve element to be acted upon accordingly.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels in Verbindung mit der Zeichnung im Einzelnen erläutert. Es zeigen:

Figur 1
einen schematischen Längsschnitt durch einen Aktuator mit Ventileinheit für einen piezoservobetriebenen Injektor; und
Figur 2
einen Horizontalschnitt durch den Aktuator mit einer Draufsicht auf die vorgesehene Bodenplatte.
The invention is explained in detail below using an exemplary embodiment in conjunction with the drawing. Show it:
Figure 1
a schematic longitudinal section through an actuator with valve unit for a piezo servo-operated injector; and
Figure 2
a horizontal section through the actuator with a plan view of the intended base plate.

Der in Figur 1 im Längsschnitt dargestellte Aktuator mit Ventileinheit besitzt ein Außengehäuse 1, das einen Innenraum bildet, in dem ein Aktuatorgehäuse 2 auf- und abbeweglich angeordnet ist. In das Außengehäuse 1 ist eine Bodenplatte 4 eingeschweißt, wie durch die Schweißstellen 5 angedeutet ist. Der in Figur 2 dargestellte Horizontalschnitt zeigt die Bodenplatte 4 in der Draufsicht, die über zwei Ansätze 12 über die Schweißstellen 5 mit der Innenwand des Außengehäuses 1 verschweißt ist. Zwischen den beiden Ansätzen 12 sind zwei halbrunde Schlitze 13 in der Bodenplatte 4 ausgebildet, durch die sich die Wandung des zylindrisch ausgebildeten Aktuatorgehäuses 2 erstreckt. Das Aktuatorgehäuse 2 kann sich somit durch die Schlitze 13 der Bodenplatte 4 auf- und abbewegen.The in Figure 1 The actuator with valve unit shown in longitudinal section has an outer housing 1 which forms an interior space in which an actuator housing 2 is arranged so as to be movable up and down. A base plate 4 is welded into the outer housing 1, as indicated by the welds 5. The in Figure 2 The horizontal section shown shows the bottom plate 4 in a top view, which is welded to the inner wall of the outer housing 1 via two attachments 12 via the welds 5. Between the two lugs 12, two semicircular slots 13 are formed in the base plate 4, through which the wall of the cylindrical actuator housing 2 extends. The actuator housing 2 can thus move up and down through the slots 13 of the base plate 4.

Das Aktuatorgehäuse 2 ist an seinem von der Ventileinheit abgewandten Ende geschlossen und weist dort eine Kopfplatte 14 auf. Am gegenüberliegenden Ende besitzt das Aktuatorgehäuse 2 eine zentrale Öffnung 6, durch die sich ein Ventilkolben 7 erstreckt, der einen im Inneren des Aktuatorgehäuses 2 angeordneten Endflansch 15 aufweist. Der Endflansch 15 hintergreift den benachbart zur Öffnung 6 angeordneten Wandungsbereich des Aktuatorgehäuses 2.The actuator housing 2 is closed at its end facing away from the valve unit and has a head plate 14 there. At the opposite end, the actuator housing 2 has a central opening 6 through which a valve piston 7 extends, which has an end flange 15 arranged in the interior of the actuator housing 2. The end flange 15 engages behind the wall area of the actuator housing 2 arranged adjacent to the opening 6.

Der Ventilkolben 7 wirkt mit einem Ventilelement 8 zusammen, das mit einem Ventilsitz 9 kooperiert. Das Ventilelement 8 öffnet und schließt einen Kanal 16, über den Kraftstoff einer Einspritzdüse zugeführt wird.The valve piston 7 cooperates with a valve element 8 which cooperates with a valve seat 9. The valve element 8 opens and closes a channel 16 through which fuel is supplied to an injection nozzle.

Zwischen der Kopfplatte 14 des Aktuatorgehäuses 2 und der fest installierten Bodenplatte 4 ist ein Piezoelement 3 angeordnet. Ein erstes Vorspannungselement 11 in der Form einer Feder drückt das Aktuatorgehäuse 3 in Figur 1 nach unten, und ein zweites Vorspannungselement 10 ist zwischen dem Ventilkolben 7 und der Bodenplatte 4 angeordnet und drückt den Ventilkolben 7 in der Figur 1 nach unten gegen das Ventilelement 8 und dieses damit gegen den Ventilsitz 9, um den Kanal 16 zu schließen.A piezo element 3 is arranged between the top plate 14 of the actuator housing 2 and the permanently installed base plate 4. A first biasing element 11 in the form of a spring presses the actuator housing 3 in Figure 1 downward, and a second biasing element 10 is arranged between the valve piston 7 and the bottom plate 4 and presses the valve piston 7 in the Figure 1 downwards against the valve element 8 and thus against the valve seat 9 in order to close the channel 16.

Der Aktuator funktioniert in der folgenden Weise:
Wenn das Piezoelement 3 mit einer elektrischen Spannung beaufschlagt wird, vergrößert sich seine Länge, wodurch das Aktuatorgehäuse 14 gegen das Vorspannungselement 11 in der Figur 1 nach oben bewegt wird. Hierdurch wird der Ventilkolben 7 gegen das Vorspannungselement 10 ebenfalls nach oben bewegt, wodurch das Ventilelement 8 vom Ventilsitz 9 abgehoben und der Kanal 16 geöffnet wird. Die Ventileinheit arbeitet somit mit dem im Kanal 16 anstehenden Druck und nicht gegen denselben, wenn das Ventil geöffnet wird.The actuator works in the following way:
When the piezo element 3 is subjected to an electrical voltage, its length increases, whereby the actuator housing 14 against the biasing element 11 in the Figure 1 is moved upwards. As a result, the valve piston 7 is also moved upwards against the prestressing element 10, as a result of which the valve element 8 is lifted from the valve seat 9 and the channel 16 is opened. The valve unit thus works with the pressure present in channel 16 and not against it when the valve is opened.

Bei einem Schließen des Ventils wird die Spannungsbeaufschlagung des Piezoelementes 3 gestoppt. Es folgt dann eine Kontraktion desselben, wodurch das Aktuatorgehäuse 2 in der Figur 1 abwärts bewegt wird. Der Ventilkolben 7 wird dadurch vom Vorspannungselement 10 nach unten gegen das Ventilelement 8 gedrückt, so dass dieses gegen den Ventilsitz 9 gepresst und der Kanal 16 geschlossen wird.When the valve closes, the application of voltage to the piezoelectric element 3 is stopped. It then follows a contraction of the same, whereby the actuator housing 2 in the Figure 1 is moved downwards. The valve piston 7 is thereby pressed downwards against the valve element 8 by the prestressing element 10, so that the latter is pressed against the valve seat 9 and the channel 16 is closed.

Das Öffnen der Ventileinheit erfolgt somit in Richtung des anstehenden Drucks mithilfe des Aktuators. Der als Kraftübertragungseinrichtung dienende Ventilkolben 7 wird vom Aktuatorgehäuse 2 betätigt, und zwar in Druckrichtung, wie vorstehend erwähnt.The valve unit is therefore opened in the direction of the pressure applied with the aid of the actuator. The valve piston 7 serving as a power transmission device is actuated by the actuator housing 2, specifically in the pressure direction, as mentioned above.

Claims (5)

  1. Actuator having a valve unit for a piezoelectric servo-operated injector with
    an outer housing (1) which forms an interior space,
    a fixed base plate (4) which extends through the interior space of the outer housing (1) and is connected to the latter,
    a movable actuator housing (2) which extends through the base plate (4) within the outer housing (1),
    a piezoelectric element (3) which is arranged between the fixed base plate (4) and a top plate (14) of the movable actuator housing (2),
    a movable valve element (8) which interacts with a valve seat (9),
    a force transmission device between the actuator housing (2) and the movable valve element (8),
    a first prestressing element (11) which prestresses the actuator housing (2) in the direction of the valve element (8), and
    a second prestressing element (10) which prestresses the force transmission device in the direction of the valve element (8),
    it being possible for the actuator housing (2) to be moved counter to the first prestressing element (11) by way of a length extension of the piezoelectric element (3) and, as a result, for the force transmission device to be moved counter to the second prestressing element (10) in order to lift up the valve element (8) from the valve seat (9), characterized in that the actuator housing (2) has an opening (6) at the end which faces the valve unit, through which opening (6) the force transmission device extends and engages behind the inner wall of the actuator housing (2), and in that the force transmission device comprises a lever device.
  2. Actuator according to Claim 1, characterized in that the force transmission device comprises a valve piston (7).
  3. Actuator according to Claim 2, characterized in that the valve piston (7) has an end flange (15) which interacts with the inner wall of the actuator housing (2).
  4. Actuator according to Claim 3, characterized in that the second prestressing element (10) is arranged between the base plate (4) and the end flange (15) of the valve piston (7).
  5. Actuator according to one of the preceding claims, characterized in that the base plate (4) is fixed on the outer housing (1) via attachments (12), with the result that slots (13) are formed between the base plate (4) and the outer housing (1), through which slots (13) the actuator housing (2) extends.
EP16774945.6A 2015-10-09 2016-09-29 Actuator with valve unit for a piezo servo-operated injector Active EP3359800B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015219568.6A DE102015219568B4 (en) 2015-10-09 2015-10-09 Actuator with valve unit for piezoservo driven injector
PCT/EP2016/073363 WO2017060163A1 (en) 2015-10-09 2016-09-29 Actuator with valve unit for a piezo servo-operated injector

Publications (2)

Publication Number Publication Date
EP3359800A1 EP3359800A1 (en) 2018-08-15
EP3359800B1 true EP3359800B1 (en) 2020-12-30

Family

ID=57044965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16774945.6A Active EP3359800B1 (en) 2015-10-09 2016-09-29 Actuator with valve unit for a piezo servo-operated injector

Country Status (3)

Country Link
EP (1) EP3359800B1 (en)
DE (1) DE102015219568B4 (en)
WO (1) WO2017060163A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015125438A1 (en) * 2014-02-24 2015-08-27 株式会社フジキン Piezoelectric linear actuator, piezoelectrically driven valve, and flow rate control device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19702066C2 (en) * 1997-01-22 1998-10-29 Daimler Benz Ag Piezoelectric injector for fuel injection systems of internal combustion engines
DE19901711A1 (en) * 1999-01-18 2000-07-20 Bosch Gmbh Robert Fuel injector and method for operating a fuel injector
DE19921489A1 (en) * 1999-05-08 2000-11-09 Bosch Gmbh Robert Fuel injector
DE19946869A1 (en) * 1999-09-30 2001-04-05 Bosch Gmbh Robert Fuel injector
DE19947779A1 (en) * 1999-10-02 2001-04-12 Bosch Gmbh Robert Fuel injector
DE102005016461A1 (en) * 2005-04-11 2006-10-12 Robert Bosch Gmbh Fuel injection valve for internal combustion engine, has actuator electrically contacted by electrical conductors that are fixed at bearing points, where one electrical conductor provided between bearing points has cable cleat

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015125438A1 (en) * 2014-02-24 2015-08-27 株式会社フジキン Piezoelectric linear actuator, piezoelectrically driven valve, and flow rate control device

Also Published As

Publication number Publication date
DE102015219568A1 (en) 2017-04-13
DE102015219568B4 (en) 2017-06-08
WO2017060163A1 (en) 2017-04-13
EP3359800A1 (en) 2018-08-15

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