EP1642022B1 - Valve for controlling liquids - Google Patents

Valve for controlling liquids Download PDF

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Publication number
EP1642022B1
EP1642022B1 EP04721817A EP04721817A EP1642022B1 EP 1642022 B1 EP1642022 B1 EP 1642022B1 EP 04721817 A EP04721817 A EP 04721817A EP 04721817 A EP04721817 A EP 04721817A EP 1642022 B1 EP1642022 B1 EP 1642022B1
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EP
European Patent Office
Prior art keywords
valve
actuator
ring seal
region
diameter
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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 - Fee Related
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EP04721817A
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German (de)
French (fr)
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EP1642022A1 (en
Inventor
Dieter Kienzler
Dietmar Schmieder
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1642022A1 publication Critical patent/EP1642022A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/215—Piezoelectric or magnetostrictive elements being able to tilt in its housing

Definitions

  • the invention is based on a valve for controlling fluids according to the type defined in more detail in the preamble of patent claim 1.
  • Such a valve is out of the DE 101 40 529 A1 known and used for example in a fuel injection valve, in particular in a common rail injector of a diesel engine of a motor vehicle.
  • A1 known valve comprises a piezoelectric actuator unit having an actuator base and an actuator head.
  • the actuator base is supported by a rounded, annular edge on a conical seat, which is formed on a valve housing.
  • the actuator head acts on a coupler module, the one with the actuator head connected, so-called actuating piston comprises, which is connected via a hydraulic coupler with a so-called actuating piston in operative connection.
  • the actuating piston acts on a valve closing member, which cooperates with a valve seat and by means of which a fluid flow is controllable.
  • an O-ring is mounted in an annular groove in the area of the actuator base.
  • the O-ring is arranged behind the rounded edge, as seen from the actuator head.
  • the assembly formed of the piezoelectric actuator unit and the coupler module forms a valve control unit of the fuel injection valve and serves to control a arranged in an injector module of the fuel injection valve nozzle needle, which cooperates with leading to a combustion chamber of the internal combustion engine injection openings.
  • the actuator foot is biased by a spring sleeve which surrounds the coupler module with a force of about 700 N.
  • a spring sleeve which surrounds the coupler module with a force of about 700 N.
  • the areas of the actuator foot defining the annular groove for the O-ring are arranged in the valve housing with a slight lateral play.
  • the low clearance leads disadvantageously to the fact that the possible rotation of the Aktorfußes is very low, which may not be sufficiently compensated, if necessary, the occurring tolerance-related twists and assembly-related displacements of the actuator head.
  • valve the ball surface of the actuator base is arranged from the actuator head behind the O-ring seal, has the advantage that by appropriate arrangement of the spherical surface compared to the known valve described in the introduction in the ball bearing or the rounded edge, a smaller friction radius can be achieved, which causes a lower resistance moment in the storage area. This leads to tolerance-related Twists and assembly-related displacements of the actuator head to a smaller bending moment, which is exerted on the piezoelectric actuator unit. The friction radius and the occurring bending stresses in the piezoelectric actuator unit can be reduced by up to 50 percent compared to the known valve.
  • the valve according to the invention for controlling fluids forms in particular a valve control unit of a fuel injection valve, in particular of a common rail injector of an internal combustion engine of a motor vehicle.
  • the O-ring seal is slid over an area of reduced diameter of the actuator base.
  • the O-ring seal which preferably has an inner diameter slightly smaller than the diameter of the reduced diameter portion of the actuator root, is thus easy and safe to install because of the risk of O-ring twisting, which disadvantageously results in leaks while the assembly is reduced.
  • FIG. 1 a longitudinal section through a valve according to the invention in a fragmentary view; and FIG. 2 an enlarged view of the in FIG. 1 dashed bordered area II.
  • valve control unit 1 of a fuel injection valve which serves as a common rail injector for the injection of preferably diesel fuel into a combustion chamber of a diesel engine of a motor vehicle, not shown here.
  • the fuel injection valve comprises, in addition to the valve control unit 1, a nozzle module, not shown in detail, in which an axially displaceable nozzle needle is arranged, which is in operative connection with so-called injection openings leading to the combustion chamber of the internal combustion engine.
  • the valve control unit 1 serves to actuate the nozzle needle.
  • the valve control unit 1 comprises a valve housing 2, in which an axially aligned fuel supply channel 3, which leads to the nozzle module, and a receiving space 4 for a piezoelectric actuator unit 5 and a hydraulic coupler module 6 are formed.
  • the piezoelectric actuator module 5 comprises a piezoelectric actuator 7, which is arranged between an actuator base 8 and an actuator head 9.
  • the piezoelectric actuator unit 5 is encapsulated, by means of a tubular sleeve 10 which is fixedly connected to the actuator base 8, and a 9 surrounding Wellbalgmembran 11, which is connected to the sleeve 10 and for receiving an axial bearing of the piezoelectric actuator 7 is designed.
  • the actuating piston is in turn connected to a valve closing member, which cooperates with a valve seat and when actuated a pressure change in a valve control chamber of the nozzle module, whereby the nozzle needle undergoes an axial displacement, so that the injection openings are opened or closed.
  • the coupler module 6 further comprises a spring sleeve 15, by means of which a bias voltage of the piezoelectric actuator module 5 takes place with a force of about 700 N.
  • the actuator foot 8 is designed in a stepped manner and includes a directly to the piezoelectric actuator 7 subsequent, first region 16, whose diameter corresponds approximately to that of the piezoelectric actuator 7 and which merges into a second region 17 of average diameter, which in turn is followed by a third region 18 of reduced diameter.
  • a third region 18 of reduced diameter In the area of reduced diameter, an O-ring seal 20 is pressed or pushed, which rests against the wall of the valve housing 2.
  • the third region 18 of reduced diameter of the actuator base 8 has a diameter D1, which is slightly larger than the inner diameter of the O-ring 20, so that the latter is securely seated on the third region 18 of reduced diameter of the actuator base 18.
  • the piezoelectric actuator 7 a trained as a ball bearing curved surface or spherical surface 21, which is supported on a conical seat 22 which is formed on the valve housing 2.
  • the spherical surface 21 is defined by a radius designated DR radius DR, wherein a tilting of the actuator base 8 via a pivot point X can take place.
  • a gap S is formed, which can be chosen so large that any occurring, tolerance-related rotations and / or assembly-related displacements of the actuator head 9 in the radial direction, in FIG. 1 exemplified by a double arrow marked Y, can be compensated.
  • This is also a small distance A, which is formed between the pivot point X and the transition between a cylindrical portion 23 of reduced diameter of the receiving space 4 and a conical portion 24 of the receiving space 4.

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Ventil zum Steuern von Flüssigkeiten gemäß der im Oberbegriff des Patentanspruch 1 näher definierten Art aus.The invention is based on a valve for controlling fluids according to the type defined in more detail in the preamble of patent claim 1.

Ein derartiges Ventil ist aus der DE 101 40 529 A1 bekannt und beispielsweise bei einem Kraftstoffeinspritzventil, insbesondere bei einem Common-Rail-Injektor einer Dieselbrennkraftmaschine eines Kraftfahrzeuges einsetzbar.Such a valve is out of the DE 101 40 529 A1 known and used for example in a fuel injection valve, in particular in a common rail injector of a diesel engine of a motor vehicle.

Das aus der DE 101 40 529 A1 bekannte Ventil umfasst eine piezoelektrische Aktuatoreinheit, die einen Aktorfuß und einen Aktorkopf aufweist. Der Aktorfuß stützt sich über eine abgerundete, ringförmige Kante an einem Kegelsitz ab, der an einem Ventilgehäuse ausgebildet ist. Der Aktorkopf wirkt auf ein Kopplermodul, das einen mit dem Aktorkopf verbundenen, sogenannten Stellkolben umfasst, der über einen hydraulischen Koppler mit einem sogenannten Betätigungskolben in Wirkverbindung steht. Der Betätigungskolben wirkt auf ein Ventilschließglied, das mit einem Ventilsitz zusammenwirkt und mittels dem ein Fluidstrom steuerbar ist.That from the DE 101 40 529 A1 known valve comprises a piezoelectric actuator unit having an actuator base and an actuator head. The actuator base is supported by a rounded, annular edge on a conical seat, which is formed on a valve housing. The actuator head acts on a coupler module, the one with the actuator head connected, so-called actuating piston comprises, which is connected via a hydraulic coupler with a so-called actuating piston in operative connection. The actuating piston acts on a valve closing member, which cooperates with a valve seat and by means of which a fluid flow is controllable.

Durch die Lagerung des Aktorfußes über die abgerundete Kante an der Kegelfläche des Ventilgehäuses können toleranzbedingte Schrägstellungen und montagebedingte Verschiebungen des Aktorkopfes ausgeglichen werden. Zur Abdichtung ist im Bereich des Aktorfußes ein O-Ring in einer Ringnut gelagert. Der O-Ring ist von dem Aktorkopf aus gesehen hinter der abgerundeten Kante angeordnet.Due to the bearing of the actuator base on the rounded edge on the conical surface of the valve housing tolerance-related inclinations and assembly-related displacements of the actuator head can be compensated. For sealing an O-ring is mounted in an annular groove in the area of the actuator base. The O-ring is arranged behind the rounded edge, as seen from the actuator head.

Die aus der piezoelektrischen Aktuatoreinheit und dem Kopplermodul gebildete Baugruppe bildet eine Ventilsteuereinheit des Kraftstoffeinspritzventils und dient zur Steuerung einer in einem Injektormodul des Kraftstoffeinspritzventils angeordneten Düsennadel, die mit zu einem Verbrennungsraum der Brennkraftmaschine führenden Einspritzöffnungen zusammenwirkt.The assembly formed of the piezoelectric actuator unit and the coupler module forms a valve control unit of the fuel injection valve and serves to control a arranged in an injector module of the fuel injection valve nozzle needle, which cooperates with leading to a combustion chamber of the internal combustion engine injection openings.

Bei der Montage des bekannten Ventils wird der Aktorfuß durch eine Federhülse, die das Kopplermodul umgibt, mit einer Kraft von etwa 700 N vorgespannt. Bei Ausgleich einer toleranzbedingten Schrägstellung und von montagebedingten Verschiebungen des Aktorkopfes entsteht im Bereich der eine Kugellagerung darstellenden abgerundeten Kante ein Reibmoment. Dieses Reibmoment erzeugt in der piezoelektrischen Aktuatoreinheit Biegespannungen, die zu Beschädigungen führen können.During assembly of the known valve, the actuator foot is biased by a spring sleeve which surrounds the coupler module with a force of about 700 N. When compensating a tolerance-related inclination and assembly-related displacements of the actuator head creates a friction torque in the region of a ball bearing performing rounded edge. This frictional torque generates bending stresses in the piezoelectric actuator unit, which can lead to damage.

Um Undichtigkeiten im Bereich der O-Ringdichtung zu vermeiden, sind die die Ringnut für den O-Ring begrenzenden Bereiche des Aktorfußes mit einem geringen lateralen Spiel in dem Ventilgehäuse angeordnet. Das geringe Spiel führt nachteilhafterweise dazu, dass die mögliche Verdrehung des Aktorfußes sehr gering ist, wodurch gegebenenfalls die auftretenden toleranzbedingten Verdrehungen und montagebedingten Verschiebungen des Aktorkopfes nicht hinreichend ausgeglichen werden können.In order to avoid leaks in the region of the O-ring seal, the areas of the actuator foot defining the annular groove for the O-ring are arranged in the valve housing with a slight lateral play. The low clearance leads disadvantageously to the fact that the possible rotation of the Aktorfußes is very low, which may not be sufficiently compensated, if necessary, the occurring tolerance-related twists and assembly-related displacements of the actuator head.

Des weiteren besteht bei dem bekannten Ventil das Problem, dass der O-Ring zur Montage in der Ringnut stark gedehnt werden muss, was einerseits einen erhöhten Montageaufwand darstellt und andererseits verstärkt zu Verdrehungen des O-Rings führen kann, wobei letztgenannte Verdrehungen in nachteilhafter Weise zu Undichtigkeiten führen können.Furthermore, there is the problem in the known valve that the O-ring must be greatly stretched for mounting in the annular groove, which on the one hand represents an increased installation effort and on the other hand can lead to increased torsion of the O-ring, the latter distortions disadvantageously too Leaks can lead.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Ventil zum Steuern von Flüssigkeiten mit den Merkmalen nach dem Oberbegriff des Patentanspruches 1, bei welchem Ventil die Kugelfläche des Aktorfußes von dem Aktorkopf aus gesehen hinter der O-Ringdichtung angeordnet ist, hat den Vorteil, dass durch entsprechende Anordnung der Kugelfläche im Vergleich zu dem einleitend beschriebenen bekannten Ventil im Bereich der Kugellagerung bzw. der abgerundeten Kante ein kleinerer Reibradius erreicht werden kann, was ein geringeres Widerstandsmoment im Lagerbereich verursacht. Dies führt bei toleranzbedingten Verdrehungen und montagebedingten Verschiebungen des Aktorkopfes zu einem kleineren Biegemoment, das auf die piezoelektrische Aktuatoreinheit ausgeübt wird. Der Reibradius und die auftretenden Biegespannungen in der piezoelektrischen Aktuatoreinheit können im Vergleich zu dem bekannten Ventil um bis zu 50 Prozent reduziert werden.The valve according to the invention for controlling fluids with the features according to the preamble of claim 1, wherein valve the ball surface of the actuator base is arranged from the actuator head behind the O-ring seal, has the advantage that by appropriate arrangement of the spherical surface compared to the known valve described in the introduction in the ball bearing or the rounded edge, a smaller friction radius can be achieved, which causes a lower resistance moment in the storage area. This leads to tolerance-related Twists and assembly-related displacements of the actuator head to a smaller bending moment, which is exerted on the piezoelectric actuator unit. The friction radius and the occurring bending stresses in the piezoelectric actuator unit can be reduced by up to 50 percent compared to the known valve.

Das erfindungsgemäße Ventil zum Steuern von Flüssigkeiten bildet insbesondere eine Ventilsteuereinheit eines Kraftstoffeinspritzventils, insbesondere eines Common-Rail-Injektors einer Brennkraftmaschine eines Kraftfahrzeuges.The valve according to the invention for controlling fluids forms in particular a valve control unit of a fuel injection valve, in particular of a common rail injector of an internal combustion engine of a motor vehicle.

Bei einer bevorzugten Ausführungsform des Ventils nach der Erfindung ist die O-Ringdichtung auf einem Bereich verringerten Durchmessers des Aktorfußes aufgeschoben. Die O-Ringdichtung, die vorzugsweise einen Innendurchmesser hat, der geringfügig kleiner ist als der Durchmesser des Bereichs des Aktorfußes mit dem verringerten Durchmesser, ist damit einfach und sicher zu montieren, da die Gefahr von Verdrehungen des O-Rings, die nachteilhafterweise zu Undichtigkeiten führen, während der Montage reduziert ist.In a preferred embodiment of the valve according to the invention, the O-ring seal is slid over an area of reduced diameter of the actuator base. The O-ring seal, which preferably has an inner diameter slightly smaller than the diameter of the reduced diameter portion of the actuator root, is thus easy and safe to install because of the risk of O-ring twisting, which disadvantageously results in leaks while the assembly is reduced.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes nach der Erfindung sind der Beschreibung, der Zeichnung und den Patentansprüchen entnehmbar.Further advantages and advantageous embodiments of the article according to the invention are the description, the drawings and the claims removed.

Zeichnungdrawing

Ein Ausführungsbeispiel des Ventils nach der Erfindung ist in der Zeichnung schematisch vereinfacht dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Es zeigen
Figur 1 einen Längsschnitt durch ein Ventil nach der Erfindung in einer ausschnittsweisen Darstellung; und
Figur 2 eine vergrößerte Darstellung des in Figur 1 gestrichelt umrandeten Bereichs II.An embodiment of the valve according to the invention is shown schematically simplified in the drawing and will be explained in more detail in the following description. Show it
FIG. 1 a longitudinal section through a valve according to the invention in a fragmentary view; and
FIG. 2 an enlarged view of the in FIG. 1 dashed bordered area II.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In den Figuren 1 und 2 ist eine Ventilsteuereinheit 1 eines Kraftstoffeinspritzventils dargestellt, welches als Common-Rail-Injektor zur Einspritzung von vorzugsweise Dieselkraftstoff in einen Verbrennungsraum einer hier nicht näher dargestellten Dieselbrennkraftmaschine eines Kraftfahrzeuges dient.In the FIGS. 1 and 2 a valve control unit 1 of a fuel injection valve is shown, which serves as a common rail injector for the injection of preferably diesel fuel into a combustion chamber of a diesel engine of a motor vehicle, not shown here.

Das Kraftstoffeinspritzventil umfasst neben der Ventilsteuereinheit 1 ein nicht näher dargestelltes Düsenmodul, in welchem eine axial verschiebbare Düsennadel angeordnet ist, die mit sogenannten Einspritzöffnungen, die zu dem Verbrennungsraum der Brennkraftmaschine führen, in Wirkverbindung steht. Die Ventilsteuereinheit 1 dient zur Betätigung der Düsennadel.The fuel injection valve comprises, in addition to the valve control unit 1, a nozzle module, not shown in detail, in which an axially displaceable nozzle needle is arranged, which is in operative connection with so-called injection openings leading to the combustion chamber of the internal combustion engine. The valve control unit 1 serves to actuate the nozzle needle.

Die Ventilsteuereinheit 1 umfasst ein Ventilgehäuse 2, in welchem ein axial ausgerichteter Kraftstoffzufuhrkanal 3, der zu dem Düsenmodul führt, und ein Aufnahmeraum 4 für eine piezoelektrische Aktuatoreinheit 5 und ein hydraulisches Kopplermodul 6 ausgebildet sind.The valve control unit 1 comprises a valve housing 2, in which an axially aligned fuel supply channel 3, which leads to the nozzle module, and a receiving space 4 for a piezoelectric actuator unit 5 and a hydraulic coupler module 6 are formed.

Das piezoelektrische Aktuatormodul 5 umfasst einen piezoelektrischen Aktor 7, der zwischen einem Aktorfuß 8 und einem Aktorkopf 9 angeordnet ist. Zum Schutz vor Kraftstoff ist die piezoelektrische Aktoreinheit 5 gekapselt, und zwar mittels einer rohrförmigen Hülse 10, die mit dem Aktorfuß 8 fest verbunden ist, und einer den Aktorkopf 9 umgebenden Wellbalgmembran 11, die mit der Hülse 10 verbunden ist und zur Aufnahme einer axialen Lagerung des piezoelektrischen Aktors 7 ausgelegt ist.The piezoelectric actuator module 5 comprises a piezoelectric actuator 7, which is arranged between an actuator base 8 and an actuator head 9. For protection against fuel, the piezoelectric actuator unit 5 is encapsulated, by means of a tubular sleeve 10 which is fixedly connected to the actuator base 8, and a 9 surrounding Wellbalgmembran 11, which is connected to the sleeve 10 and for receiving an axial bearing of the piezoelectric actuator 7 is designed.

Der Aktorkopf 9, der zur Übertragung der Längenveränderung des piezoelektrischen Aktors 7 auf das Kopplermodul 6 dient, greift an einer mit einer korrespondierenden Ausnehmung 12 versehenen Scheibe 13 an, die mit einem Stellkolben 14 des Kopplermoduls 6 fest verbunden ist, welcher wiederum über einen nicht dargestellten, als Hydraulikkammer ausgebildeten hydraulischen Koppler mit einem ebenfalls nicht dargestellten Betätigungskolben gekoppelt ist. Der Betätigungskolben ist wiederum mit einem Ventilschließglied verbunden, das mit einem Ventilsitz zusammenwirkt und bei dessen Betätigung eine Druckveränderung in einem Ventilsteuerraum des Düsenmoduls erfolgt, wodurch die Düsennadel eine axiale Verschiebung erfährt, so dass die Einspritzöffnungen geöffnet bzw. geschlossen werden.The actuator head 9, which serves to transmit the change in length of the piezoelectric actuator 7 on the coupler module 6, engages a provided with a corresponding recess 12 disc 13 which is fixedly connected to a control piston 14 of the coupler module 6, which in turn via a non-illustrated , designed as a hydraulic chamber hydraulic coupler is coupled to an actuating piston, also not shown. The actuating piston is in turn connected to a valve closing member, which cooperates with a valve seat and when actuated a pressure change in a valve control chamber of the nozzle module, whereby the nozzle needle undergoes an axial displacement, so that the injection openings are opened or closed.

Das Kopplermodul 6 umfasst des Weiteren eine Federhülse 15, mittels der eine Vorspannung des piezoelektrischen Aktormoduls 5 mit einer Kraft von etwa 700 N erfolgt.The coupler module 6 further comprises a spring sleeve 15, by means of which a bias voltage of the piezoelectric actuator module 5 takes place with a force of about 700 N.

Der Aktorfuß 8, der in Figur 2 näher dargestellt ist, ist gestuft ausgebildet und umfasst einen sich direkt an den piezoelektrischen Aktor 7 anschließenden, ersten Bereich 16, dessen Durchmesser etwa demjenigen des piezoelektrischen Aktors 7 entspricht und der in einen zweiten Bereich 17 mittleren Durchmessers übergeht, an welchen sich wiederum ein dritter Bereich 18 verringerten Durchmessers anschließt. Auf den Bereich verringerten Durchmessers ist eine O-Ringdichtung 20 aufgepresst bzw. aufgeschoben, die an der Wandung des Ventilgehäuses 2 anliegt. Der dritte Bereich 18 verringerten Durchmessers des Aktorfußes 8 hat einen Durchmesser D1, der etwas größer ist als der Innndurchmesser des O-Rings 20, so dass letzterer sicher auf dem dritten Bereich 18 verringerten Durchmessers des Aktorfußes 18 sitzt.The actuator foot 8, the in FIG. 2 is shown in more detail, is designed in a stepped manner and includes a directly to the piezoelectric actuator 7 subsequent, first region 16, whose diameter corresponds approximately to that of the piezoelectric actuator 7 and which merges into a second region 17 of average diameter, which in turn is followed by a third region 18 of reduced diameter. In the area of reduced diameter, an O-ring seal 20 is pressed or pushed, which rests against the wall of the valve housing 2. The third region 18 of reduced diameter of the actuator base 8 has a diameter D1, which is slightly larger than the inner diameter of the O-ring 20, so that the latter is securely seated on the third region 18 of reduced diameter of the actuator base 18.

An den dritten Bereich 18 verringerten Durchmessers des Aktorfußes 8 schließt sich in der dem piezoelektrischen Aktor 7 abgewandten Richtung eine als Kugellagerung ausgebildete gekrümmte Fläche bzw. Kugelfläche 21 an, welche sich an einem Kegelsitz 22 abstützt, der an dem Ventilgehäuse 2 ausgebildet ist. Die Kugelfläche 21 ist durch einen als Reibradius bezeichneten Radius DR definiert, wobei eine Verkippung des Aktorfußes 8 über einen Drehpunkt X erfolgen kann.At the third region 18 of reduced diameter of the Aktorfußes 8 is followed in the direction away from the piezoelectric actuator 7 a trained as a ball bearing curved surface or spherical surface 21, which is supported on a conical seat 22 which is formed on the valve housing 2. The spherical surface 21 is defined by a radius designated DR radius DR, wherein a tilting of the actuator base 8 via a pivot point X can take place.

Zwischen dem zweiten Bereich 17 mittleren Durchmessers des Aktorfußes 8 und der Wandung des Ventilgehäuses 2 ist ein Spalt S ausgebildet, der so groß gewählt werden kann, dass gegebenenfalls auftretende, toleranzbedingte Verdrehungen und/oder montagebedingte Verschiebungen des Aktorkopfes 9 in radialer Richtung, die in Figur 1 exemplarisch mit einem mit Y gekennzeichneten Doppelpfeil angedeutet sind, ausgeglichen werden können. Hierzu trägt auch ein kleiner Abstand A bei, der zwischen dem Drehpunkt X und dem Übergang zwischen einem zylindrischen Bereich 23 verringerten Durchmessers des Aufnahmeraums 4 und einem konischen Bereich 24 des Aufnahmeraums 4 ausgebildet ist.Between the second region 17 of average diameter of the actuator base 8 and the wall of the valve housing 2, a gap S is formed, which can be chosen so large that any occurring, tolerance-related rotations and / or assembly-related displacements of the actuator head 9 in the radial direction, in FIG. 1 exemplified by a double arrow marked Y, can be compensated. This is also a small distance A, which is formed between the pivot point X and the transition between a cylindrical portion 23 of reduced diameter of the receiving space 4 and a conical portion 24 of the receiving space 4.

Claims (3)

  1. Valve for the control of liquids, with a piezoelectric actuator unit (5) which has an actuator foot (8) and an actuator head (9) acting on a coupler module (6) connected to a valve-closing member which cooperates with a valve seat, the actuator foot (8) being supported via a spherical surface (21) on a conical seat (22) of a valve housing (2) and carrying on the circumference an O-ring seal (20), characterized in that the spherical surface (21) of the actuator foot (8) is arranged on that side of the O-ring seal (20) which faces away from the actuator head (9).
  2. Valve according to Claim 1, characterized in that the O-ring seal (20) is pushed onto a region (18) of reduced diameter (D1) of the actuator foot (8) .
  3. Valve according to Claim 2, characterized in that the O-ring seal (20) has an inside diameter which is slightly smaller than the diameter (D1) of the region (18) of reduced diameter (D1) of the actuator foot (8).
EP04721817A 2003-05-20 2004-03-19 Valve for controlling liquids Expired - Fee Related EP1642022B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10322673A DE10322673A1 (en) 2003-05-20 2003-05-20 Valve for controlling liquids
PCT/DE2004/000568 WO2004104404A1 (en) 2003-05-20 2004-03-19 Valve for controlling liquids

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EP1642022A1 EP1642022A1 (en) 2006-04-05
EP1642022B1 true EP1642022B1 (en) 2009-04-15

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EP04721817A Expired - Fee Related EP1642022B1 (en) 2003-05-20 2004-03-19 Valve for controlling liquids

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US (1) US8091859B2 (en)
EP (1) EP1642022B1 (en)
JP (1) JP4537401B2 (en)
KR (1) KR20060015732A (en)
DE (2) DE10322673A1 (en)
WO (1) WO2004104404A1 (en)

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DE102007004380A1 (en) 2007-01-29 2008-07-31 Robert Bosch Gmbh Injector with piezoelectric actuator
DE102007006942A1 (en) 2007-02-13 2008-08-14 Robert Bosch Gmbh Injector for injecting fuel into combustion chamber of internal-combustion engine, has actuator head connected with valve component, where actuator area is sealed by ring seal arranged between actuator head and injector component
JP4770847B2 (en) * 2008-02-27 2011-09-14 株式会社デンソー Diaphragm device and fuel injection device having the same
US8608127B2 (en) * 2011-01-24 2013-12-17 Fluke Corporation Piezoelectric proportional control valve
DE102013012444A1 (en) * 2013-07-29 2015-01-29 Astrium Gmbh Valve assembly for switching and / or regulating a media flow of a spacecraft and spacecraft

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US20060278837A1 (en) 2006-12-14
KR20060015732A (en) 2006-02-20
EP1642022A1 (en) 2006-04-05
WO2004104404A1 (en) 2004-12-02
JP4537401B2 (en) 2010-09-01
US8091859B2 (en) 2012-01-10
DE502004009360D1 (en) 2009-05-28
DE10322673A1 (en) 2004-12-09
JP2006529013A (en) 2006-12-28

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