EP1642022A1 - Valve for controlling liquids - Google Patents

Valve for controlling liquids

Info

Publication number
EP1642022A1
EP1642022A1 EP04721817A EP04721817A EP1642022A1 EP 1642022 A1 EP1642022 A1 EP 1642022A1 EP 04721817 A EP04721817 A EP 04721817A EP 04721817 A EP04721817 A EP 04721817A EP 1642022 A1 EP1642022 A1 EP 1642022A1
Authority
EP
European Patent Office
Prior art keywords
valve
actuator
ring seal
area
spherical surface
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
EP04721817A
Other languages
German (de)
French (fr)
Other versions
EP1642022B1 (en
Inventor
Dieter Kienzler
Dietmar Schmieder
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 EP1642022A1 publication Critical patent/EP1642022A1/en
Application granted granted Critical
Publication of EP1642022B1 publication Critical patent/EP1642022B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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 liquids according to the type defined in more detail in the preamble of claim 1.
  • Such a valve is known from DE 101 40 529 AI and can be used, for example, in a fuel injection valve, in particular in a common rail injector of a diesel engine of a motor vehicle.
  • the valve known from DE 101 40 529 AI comprises a piezoelectric actuator unit which has an actuator foot and an actuator head.
  • the actuator base is supported by a rounded, annular edge on a conical seat 30, which is formed on a valve housing.
  • the actuator head acts on a coupler module, one with the actuator head connected, so-called control piston, which is operatively connected to a so-called actuating piston via a hydraulic coupler.
  • the actuating piston acts on a valve closing element which interacts with a valve seat and by means of which a fluid flow can be controlled.
  • an O-ring is mounted in an annular groove in the area of the actuator base. The O-ring is located behind the rounded edge when viewed from the actuator head.
  • the assembly formed from the piezoelectric actuator unit and the coupler module forms a valve control unit of the fuel injection valve and is used to control a nozzle needle which is arranged in an injector module of the fuel injection valve and which cooperates with injection openings leading to a combustion chamber of the internal combustion engine.
  • the actuator foot When assembling the known valve, the actuator foot is prestressed by a spring sleeve which surrounds the coupler module with a force of approximately 700 N.
  • a frictional moment arises in the area of the rounded edge representing a ball bearing. This frictional torque generates bending stresses in the piezoelectric actuator unit, which can lead to damage.
  • the areas of the actuator foot that delimit the ring groove for the O-ring are arranged with a slight lateral play in the valve housing. The slight play disadvantageously leads to the fact that the possible rotation of the actuator foot is very small, as a result of which it is possible that the occurring tolerance-related rotations and assembly-related displacements of the actuator head cannot be sufficiently compensated for.
  • valve according to the invention for controlling liquids with the features according to the preamble of claim 1, in which valve the spherical surface of the actuator base is arranged behind the O-ring seal as seen from the actuator head, has the advantage that compared to by an appropriate arrangement of the spherical surface
  • a smaller friction radius can be achieved in the area of the ball bearing or the rounded edge, which causes a lower section modulus in the bearing area. This leads to tolerance-related Twists and assembly-related displacements of the actuator head to a smaller bending moment that is exerted on the piezoelectric actuator unit.
  • the friction radius and the bending stresses occurring 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 liquids forms in particular a valve control unit of a fuel injection valve, in particular a common rail valve.
  • the O-ring seal is pushed onto an area of reduced diameter of the actuator foot.
  • the ring seal which preferably has an inner diameter that is slightly smaller than the diameter of the area of the actuator foot with the reduced diameter, is thus easy and safe to install because of the risk of twisting of the O-ring, which disadvantageously lead to leaks during the Assembly is reduced.
  • Figure 1 shows a longitudinal section through a valve according to the invention in a fragmentary representation
  • Figure 2 is an enlarged view of the area II dashed in Figure 1.
  • valve control unit 1 of a fuel injection valve which serves as a common rail injector for injecting preferably diesel fuel into a combustion chamber of a diesel engine of a motor vehicle, not shown here.
  • the fuel injection valve comprises a nozzle module (not shown in more detail) in which an axially displaceable nozzle needle is arranged, which is operatively connected to so-called injection openings that lead 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, specifically by means of a tubular sleeve 10, which is firmly connected to the actuator base 8, and a corrugated bellows membrane 11 surrounding the actuator head 9, 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 interacts with a valve seat and when it is actuated there is a change in pressure in a valve control chamber of the nozzle module, as a result of which 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 the piezoelectric actuator module 5 is preloaded with a force of approximately 700 N.
  • the actuator base 8 which is shown in more detail in Figure 2, is stepped and includes one directly to the Piezoelectric actuator 7 adjoining, first area 16, the diameter of which corresponds approximately to that of the piezoelectric actuator 7 and which in a second area
  • the third area 18 of reduced diameter of the actuator base 8 has a diameter D1 which is somewhat larger than the inner diameter of the O-ring 20, so that the latter is securely on the third area 18 of reduced diameter of the actuator base
  • the third area 18 of reduced diameter of the actuator base 8 is adjoined in the direction facing away from the piezoelectric actuator 7 by a curved surface or spherical surface 21 which is designed as a ball bearing and 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 DR, referred to as the friction radius, and the actuator base 8 can be tilted via a pivot point X.
  • a gap S is formed between the second area 17 of medium diameter of the actuator foot 8 and the wall of the valve housing 2, which gap can be chosen to be large enough to allow any possible rotation due to tolerance and / or assembly-related displacements of the actuator head 9 in the radial direction, which is shown in FIG 1 are indicated as an example with a double arrow marked Y, can be compensated.
  • a small stood at A which is formed between the pivot point X and the transition between a cylindrical region 23 of reduced diameter of the receiving space 4 and a conical region 24 of the receiving space 4.

Abstract

The invention relates to a valve which is used to control fluids. Said valve comprises a piezoelectric actuator unit (5) comprising an actuator leg (8) and an actuator head acting upon a coupler module which is connected to the valve closing element which co-operates with the valve seat. The actuator leg (8) is supported by means of a spherical surface (21) on a spherical seat (22) of a valve housing (2) and supports an O-ring seal (20) on the periphery thereof. The spherical surface (21) of the actuator leg (8) is arranged on the side of the O-ring seal (20) facing away from the actuator head (9).

Description

L0L0
Ventil zum Steuern von FlüssigkeitenValve for controlling liquids
L5 Stand der TechnikL5 state 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 liquids according to the type defined in more detail in the preamble of claim 1.
2020
Ein derartiges Ventil ist aus der DE 101 40 529 AI bekannt und beispielsweise bei einem Kraftstoffeinspritzventil, insbesondere bei einem Common-Rail-Injektor einer Dieselbrennkraftmaschine eines Kraftfahrzeuges einsetzbar.Such a valve is known from DE 101 40 529 AI and can be used, for example, in a fuel injection valve, in particular in a common rail injector of a diesel engine of a motor vehicle.
_5_5
Das aus der DE 101 40 529 AI 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, 30 der an einem Ventilgehäuse ausgebildet ist. Der Aktorkopf wirkt auf ein Kopplermodul, das einen mit dem Aktorkopf verbundenen, sogenannten Stellkolben umfasst, der über einen hydraulisehten 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.The valve known from DE 101 40 529 AI comprises a piezoelectric actuator unit which has an actuator foot and an actuator head. The actuator base is supported by a rounded, annular edge on a conical seat 30, which is formed on a valve housing. The actuator head acts on a coupler module, one with the actuator head connected, so-called control piston, which is operatively connected to a so-called actuating piston via a hydraulic coupler. The actuating piston acts on a valve closing element which interacts with a valve seat and by means of which a fluid flow can be controlled.
Durch die Lagerung des Aktorfußes über die abgerundete Kante an der Kegelfläche des Ventilgehäuses können toleranzbedingte Schrägstellungen und montagebedingte Verschiebungen des Aktorköpfes 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.By mounting the actuator foot over 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 purposes, an O-ring is mounted in an annular groove in the area of the actuator base. The O-ring is located behind the rounded edge when viewed 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 from the piezoelectric actuator unit and the coupler module forms a valve control unit of the fuel injection valve and is used to control a nozzle needle which is arranged in an injector module of the fuel injection valve and which cooperates with injection openings leading to a combustion chamber of the internal combustion engine.
Bei der Montage des bekannten Ventils wird der Aktorfuß durch eine Federhülse, die das Kopplermodul umgibt, mit ei- ner 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. 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 ausge- glichen werden können.When assembling the known valve, the actuator foot is prestressed by a spring sleeve which surrounds the coupler module with a force of approximately 700 N. When compensating for a tolerance-related inclination and assembly-related displacements of the actuator head, a frictional moment arises in the area of the rounded edge representing a ball bearing. This frictional torque generates bending stresses in the piezoelectric actuator unit, which can lead to damage. In order to avoid leaks in the area of the O-ring seal, the areas of the actuator foot that delimit the ring groove for the O-ring are arranged with a slight lateral play in the valve housing. The slight play disadvantageously leads to the fact that the possible rotation of the actuator foot is very small, as a result of which it is possible that the occurring tolerance-related rotations and assembly-related displacements of the actuator head cannot be sufficiently compensated for.
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 0- Rings führen kann, wobei letztgenannte Verdrehungen in nachteilhafter Weise zu Undichtigkeiten' führen können.Furthermore, there is the problem with the known valve that the O-ring must be stretched considerably for assembly in the annular groove, which on the one hand represents an increased assembly effort and on the other hand can increasingly lead to twists of the O-ring, the latter twists disadvantageously Leaks'.
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 er- reicht 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 piezoelektri- sehen Aktuatoreinheit können im Vergleich zu dem bekannten Ventil um bis zu 50 Prozent reduziert werden.The valve according to the invention for controlling liquids with the features according to the preamble of claim 1, in which valve the spherical surface of the actuator base is arranged behind the O-ring seal as seen from the actuator head, has the advantage that compared to by an appropriate arrangement of the spherical surface In the known valve described in the introduction, a smaller friction radius can be achieved in the area of the ball bearing or the rounded edge, which causes a lower section modulus in the bearing area. This leads to tolerance-related Twists and assembly-related displacements of the actuator head to a smaller bending moment that is exerted on the piezoelectric actuator unit. The friction radius and the bending stresses occurring 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 Kraft- stoffeinspritzventils, insbesondere eines Common-Rail-The valve according to the invention for controlling liquids forms in particular a valve control unit of a fuel injection valve, in particular a common rail valve.
Injektors einer Brennkraftmaschine eines Kraftfahrzeuges.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 verrin- gerten Durchmessers des Aktorfußes aufgeschoben. Die 0-In a preferred embodiment of the valve according to the invention, the O-ring seal is pushed onto an area of reduced diameter of the actuator foot. The 0-
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.The ring seal, which preferably has an inner diameter that is slightly smaller than the diameter of the area of the actuator foot with the reduced diameter, is thus easy and safe to install because of the risk of twisting of the O-ring, which disadvantageously lead to leaks during 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 object according to the invention can be found in the description, the drawing and the patent claims.
Zeichnungdrawing
Ein Ausführungsbeispiel des Ventils nach der Erfindung ist in der Zeichnung schematisch vereinfacht dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Es zeigenAn embodiment of the valve according to the invention is shown schematically and simplified in the drawing is explained in more detail in the following description. Show it
Figur 1 einen Längsschnitt durch ein Ventil nach der Erfindung in einer ausschnittsweisen Darstellung; undFigure 1 shows a longitudinal section through a valve according to the invention in a fragmentary representation; and
Figur 2 eine vergrößerte Darstellung des in Figur 1 gestrichelt umrandeten Bereichs II.Figure 2 is an enlarged view of the area II dashed in Figure 1.
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.1 and 2 show a valve control unit 1 of a fuel injection valve which serves as a common rail injector for injecting 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 .In addition to the valve control unit 1, the fuel injection valve comprises a nozzle module (not shown in more detail) in which an axially displaceable nozzle needle is arranged, which is operatively connected to so-called injection openings that lead 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. 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 Aktorköpf 9 umgebenden Wellbalgmembran 11, die mit der Hülse 10 verbunden ist und zur Aufnahme einer axialen Lagerung des piezoelektrischen Aktors 7 ausgelegt ist.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. To protect against fuel, the piezoelectric actuator unit 5 is encapsulated, specifically by means of a tubular sleeve 10, which is firmly connected to the actuator base 8, and a corrugated bellows membrane 11 surrounding the actuator head 9, 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 ver- bunden, 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 is used to transmit the change in length of the piezoelectric actuator 7 to the coupler module 6, engages on a disk 13 provided with a corresponding recess 12, which is firmly connected to an actuating piston 14 of the coupler module 6, which in turn is via a not shown , Coupled 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 interacts with a valve seat and when it is actuated there is a change in pressure in a valve control chamber of the nozzle module, as a result of which 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 the piezoelectric actuator module 5 is preloaded with a force of approximately 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 BereichThe actuator base 8, which is shown in more detail in Figure 2, is stepped and includes one directly to the Piezoelectric actuator 7 adjoining, first area 16, the diameter of which corresponds approximately to that of the piezoelectric actuator 7 and which in a second area
17 mittleren Durchmessers übergeht, an welchen sich wieder- um 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 ei- nen Durchmesser Dl, der etwas größer ist als der Innndurch- messer des O-Rings 20, so dass letzterer sicher auf dem dritten Bereich 18 verringerten Durchmessers des Aktorfußes17 of medium diameter merges, which in turn is followed by a third region 18 of reduced diameter. An O-ring seal 20, which rests on the wall of the valve housing 2, is pressed or pushed onto the area of reduced diameter. The third area 18 of reduced diameter of the actuator base 8 has a diameter D1 which is somewhat larger than the inner diameter of the O-ring 20, so that the latter is securely on the third area 18 of reduced diameter of the actuator base
18 sitzt.18 sits.
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 aus- gebildet 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.*The third area 18 of reduced diameter of the actuator base 8 is adjoined in the direction facing away from the piezoelectric actuator 7 by a curved surface or spherical surface 21 which is designed as a ball bearing and 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 DR, referred to as the friction radius, and the actuator base 8 can be tilted via a pivot point X. *
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 Ab- stand 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. A gap S is formed between the second area 17 of medium diameter of the actuator foot 8 and the wall of the valve housing 2, which gap can be chosen to be large enough to allow any possible rotation due to tolerance and / or assembly-related displacements of the actuator head 9 in the radial direction, which is shown in FIG 1 are indicated as an example with a double arrow marked Y, can be compensated. A small stood at A, which is formed between the pivot point X and the transition between a cylindrical region 23 of reduced diameter of the receiving space 4 and a conical region 24 of the receiving space 4.

Claims

Ansprüche Expectations
1. Ventil zum Steuern von Flüssigkeiten, mit einer piezoelektrischen Aktuatoreinheit (5) , die einen Aktorfuß (8) und einen Aktorkopf (9) aufweist, der auf ein Kopplermodul (6) wirkt, das mit einem Ventilschließglied verbunden ist, welches mit einem Ventilsitz zusammenwirkt, wobei der Aktorfuß (8) sich über eine Kugelflä- • ehe (21) an einem Kegelsitz (22) eines Ventilgehäuses (2) abstützt und am Umfang eine O-Ringdichtung (20) trägt, dadurch gekennzeichnet, dass die Kugelfläche (21) des Aktorfußes (8) auf der dem Aktorköpf (9) abgewandten Seite der O-Ringdichtung (20) angeordnet ist.1. Valve for controlling liquids, with a piezoelectric actuator unit (5) which has an actuator base (8) and an actuator head (9) which acts on a coupler module (6) which is connected to a valve closing member which is connected to a valve seat cooperates, the actuator base (8) being supported via a spherical surface • (21) on a conical seat (22) of a valve housing (2) and carrying an O-ring seal (20) on the circumference, characterized in that the spherical surface (21 ) of the actuator base (8) is arranged on the side of the O-ring seal (20) facing away from the actuator head (9).
2. Ventil nach Anspruch 1, dadurch gekennzeichnet, dass die O-Ringdichtung (20) auf einen Bereich (18) verringerten Durchmessers (Dl) des Aktorfußes (8) aufgeschoben ist.2. Valve according to claim 1, characterized in that the O-ring seal (20) is pushed onto an area (18) of reduced diameter (Dl) of the actuator base (8).
3. Ventil nach Anspruch 2, dadurch gekennzeichnet, dass die O-Ringdichtung (20) einen Innendurchmesser hat, der geringfügig kleiner als der Durchmesser (Dl) des Bereichs (18) verringerten Durchmessers (Dl) des Aktorfußes (8) ist. 3. Valve according to claim 2, characterized in that the O-ring seal (20) has an inner diameter that is slightly smaller than the diameter (Dl) of the area (18) of reduced diameter (Dl) of the actuator base (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

Publications (2)

Publication Number Publication Date
EP1642022A1 true EP1642022A1 (en) 2006-04-05
EP1642022B1 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

Country Status (6)

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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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Also Published As

Publication number Publication date
EP1642022B1 (en) 2009-04-15
US20060278837A1 (en) 2006-12-14
KR20060015732A (en) 2006-02-20
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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