EP2691632B1 - Valve for metering a medium - Google Patents

Valve for metering a medium Download PDF

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Publication number
EP2691632B1
EP2691632B1 EP12705693.5A EP12705693A EP2691632B1 EP 2691632 B1 EP2691632 B1 EP 2691632B1 EP 12705693 A EP12705693 A EP 12705693A EP 2691632 B1 EP2691632 B1 EP 2691632B1
Authority
EP
European Patent Office
Prior art keywords
actuator
piston
valve
housing
guide
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.)
Not-in-force
Application number
EP12705693.5A
Other languages
German (de)
French (fr)
Other versions
EP2691632A1 (en
Inventor
Dietmar Schmieder
Thomas Sebastian
Andreas Jakobi
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2691632A1 publication Critical patent/EP2691632A1/en
Application granted granted Critical
Publication of EP2691632B1 publication Critical patent/EP2691632B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0059—Arrangements of valve actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8015—Provisions for assembly of fuel injection apparatus in a certain orientation, e.g. markings, notches or specially shaped sleeves other than a clip
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Definitions

  • the invention is based on a valve for metering a medium, in particular a fluid, according to the preamble of claim 1.
  • a known injection valve for a fluid ( DE 10 2009 026 532 A1 ) has a valve housing with a valve opening, a valve needle controlling the valve opening and a piezoelectric actuator for valve needle actuation.
  • a hydraulic coupler is clamped between the actuator and a fitting inserted into the valve housing.
  • the coupler has a coupler housing with a piston guide for an axially displaceable piston, whose one piston side with the coupler housing delimits a fluid-filled coupler gap.
  • the piston is axially displaceable and fixed non-rotatably on the coupler housing via a diaphragm.
  • the coupler housing is rigidly connected to the connector.
  • the actuator has a piezo module clamped between an end plate and an end body. Between the end plate of the actuator and the valve needle on the one hand and between the piston and the coupler housing on the other hand, in each case a gimbal bearing is formed, and the connecting body of the actuator is rigidly connected to the piston of the coupler.
  • the electrical connection to the piezoelectric module of the actuator is made via the electrically conductive parts of an actuator-side contact member, and a housing-side contact member, wherein the actuator-side contact member on the closing body of the actuator and the housing-side contact member on the fixedly connected to the valve housing fitting are fixed so that the electrically conductive parts of the contact members contact each other.
  • valve according to the invention with the features of claim 1 has the advantage that by the fixing of the rotational position position of the actuator in the valve housing vorescentde rotation torsional or torsional moments that occur in valve operation by energizing the valve member and valve housing gimbaled actuator at this, directly from Valve housing are received and do not affect the electrical connection to the actuator. This avoids mechanical damage to the electrical connection and increases the service life of the valve.
  • the inclusion of the contact members of the electrical connection to the actuator in the anti-rotation saves additional construction and assembly steps and allows the reduction of manufacturing costs.
  • the housing-side or the actuator-side contact member can be used for rotational position fixation of the actuator.
  • the coupling of the piston to the actuator is realized by means of a rigid connection to the valve housing side gimbal bearing of the actuator and the piston guide mounted in the valve housing gimbal.
  • the rotation is made between the housing-side contact member and the piston guide.
  • the inclusion of the housing-side contact member in the anti-rotation has the advantage that in this made with a rigid connection of actuator and piston cardanic mounting of the piston guide in the valve housing, the rotation without additional components with little processing effort is realized.
  • the cardanic bearing between a piston guide forming, the piston receiving guide pot and a fitting inserted into the valve body is made and the rotation through the guide pot and housing-side contact member, which on the connector is fastened, realized by the fact that the housing-side contact member engages the guide pot in the circumferential direction positively.
  • the housing-side contact member has two with parallel spacing axially extending contact tongues for contacting the actuator-side contact member.
  • the rotation is formed by the contact tongues, a formed on the guide pot, radially projecting between the contact tongues Fixiernase and an existing in the connector anyway axial guide groove for the contact tongues.
  • the contact tongues are based on the one hand on the fixing lug and on the other hand on the two groove walls of the guide groove, so that there is a positive connection in the circumferential direction between the guide pot and aktor workedem contact member.
  • the electrically conductive contact tongues are encased with plastic, at least in the region of the fixing nose and fixing groove, so that a conductive connection to a guide pot made of metal is prevented.
  • the piston guide is fixed to the housing and the coupling of the piston to the actuator as a cardanic bearing for housing side gimbal bearing of the actuator.
  • the rotation is made between the actuator-side contact member and the piston.
  • the displacement of the gimbal bearing away from the piston guide of the coupler and valve housing towards the actuator and piston of the coupler avoids a constructive collision between the gimbal bearing and the lead of the electrically conductive parts of the housing-side contact member to the actuator-side contact member, which require an opening in the gimbal bearing and thus whose mechanical stability would weaken. Due to the associated housing-side fixing of the piston guide, the radial forces acting on the piston are reduced even with radial accelerations. In addition, an improved heat transfer from the coupler to the valve housing is achieved. As a result of this gimbal bearing of the actuator, the actuator-side contact member provides a structurally advantageous condition for the realization of the rotation of the actuator.
  • the gimbal bearing is formed by a conical recess in a coaxial centering pin connected to the piston on the one hand and a bearing head formed on the actuator on the other hand, which is non-positively supported in the recess of the centering pin.
  • the anti-rotation has an axial groove and in the axial groove in the circumferential direction with little play positively engaging centering, whereby axial groove and centering are divided on centering and aktor workedes contact member, so either the axial groove in the centering pin and the centering on aktor remedyen contact member or vice versa the axial groove on the actuator side Contact member and the centering nose is arranged in Zentierbolzen.
  • valve for metering a medium in particular a fluid is used for example as an injection valve for injecting fuel into the combustion cylinder of an internal combustion engine.
  • the valve has a hollow cylindrical valve housing 11, one end of which is closed by a nozzle body 12 having an orifice 13.
  • the orifice 13 is controlled by an outwardly opening valve member 14, which is designed as a valve needle with a closing head, ie closed or released.
  • the valve member 14 is actuated by a piezoelectric actuator 16 against the restoring force of a valve member 14 and on the nozzle body 12 supporting return spring 15, wherein according to the size of an applied voltage to the piezoelectric actuator 16, the valve member 14 via its closing head the orifice 13 more or less releases.
  • the actuator 16 has an electrically controllable piezo module 19, which is clamped by means of a spring body formed as a hollow body 21 between a cover plate 18 and a closing body 20.
  • the actuator 16 engages via a gimbal bearing 17 on the valve member 14, wherein the gimbal bearing 17 is formed between the Schretekopffernen end of the valve needle of the valve member 14 and the end plate 18 of the actuator 16.
  • a connector 22 is inserted, which is provided with a fluid connection 23 and an electrical connector 24. From the connector 24 is by means of an actuator-side contact member 25 and a housing-side contact member 26th made an electrical connection to the piezo module 20 of the actuator 16.
  • the electrically conductive parts of the two contact members 25, 26 contact each other and are welded together at the contact points. Alternatively, the contacting parts of both contact members 25,26 also integrally with each other, the electrically conductive parts so one piece, running.
  • a hydraulic coupler 27 is arranged, via which the actuator 16 on the valve housing 11, more precisely on the fixedly connected to the valve housing 11 connecting piece 22 is supported.
  • Actuator 16 and coupler 27 are received in a tube 53, which on the one hand on the nozzle body 12 and on the other hand attached to the connector 22, z. B. welded, is.
  • annular gap 54 Between the tube 53 and the valve housing 11 remains an annular gap 54 through which there is a connection from the fluid inlet 23 to the interior of the nozzle body 12, in which the valve needle of the valve member 14 is guided axially displaceable.
  • the hydraulic coupler 27 has a piston guide 28 and an axially displaceable, non-rotatably held piston 29 which defines a liquid-filled coupler gap 30.
  • the piston guide 28 is formed by a guide pot 31 which is received in a cup-shaped recess 32 in the connecting piece 22.
  • the coupler gap 30 is connected via a bore 33 in the pot bottom of the guide pot 31 with a compensation chamber 34 in connection, which is bounded by the pot bottom and a outside the pot bottom spanning and fixed to the outer wall of the guide pot 31 membrane 35.
  • each gimbaled or mounted piezoelectric actuator 16 torsional or torques, which can lead to damage to the electrical connection to the piezo module 19 of the actuator 16.
  • an actuator 16 is provided in its rotational position fixing anti-rotation, each one of the contact members 25, 26 of the electrical connection to the actuator 16 included in the rotation.
  • the rotation on the housing-side contact member 26 or on the actuator-side contact member 25 is fixed.
  • the piston guide 28 in the valve housing 11 in the embodiment of the valve according to Figure 1 to 7 for the housing side gimbal bearing of the actuator 16, the piston guide 28 in the valve housing 11, more precisely, in the cup-shaped recess 32 of the fitting 22 inlaid guide pot 31 on the fixedly connected to the valve housing 11 connecting piece 22, gimbals and the coupling of the piston 29 to the Actuator 16 realized by means of a rigid connection.
  • the rotation is formed between the housing-side contact member 26 and the piston guide 28, so the guide pot 31.
  • a central centering pin 36 with a protruding from the piston 29, hollow bolt head 361 is inserted into the piston 29 and the closing body 20 of the actuator 16 is provided with an axially projecting pin 201, with a reduced diameter end portion in the hollow Bolt head 361 is pressed.
  • the actuator-side contact member 25 is attached on the pin 201.
  • the housing-side contact member 26 is fixed to the connecting piece 22 and engages the formation of the rotation in the circumferential direction positively on the guide pot 31.
  • the housing-side contact member 26 is in FIG. 5 in plan view and in FIG. 6 shown in longitudinal section. It has two contact tongues 37 which extend axially in the parallel spacing and form the electrically conductive parts of the housing-side contact member 26.
  • the contact tongues 37 are encapsulated with a plastic sheath 38 and held together by a plastic bridge 55, wherein the electrically conductive parts of the actuator-side contact member 25 contacting free ends of the contact blades 37 are excluded from the plastic sheath.
  • the housing-side contact member 26 is in the in FIG. 7 in longitudinal section enlarged connector shown 22 inserted.
  • the connecting piece 22 contains two parallel longitudinal bores 39 and a guide groove 40 which extends in the region of its recess 32 and projects into the two longitudinal bores 39 (cf.
  • FIG. 4 in which the two contact tongues 37 with a tongue section I ( FIG. 6 ) einre.
  • the two contact tongues 37 are on remote from one another longitudinal sides in the tongue section I on their plastic sheath 38 on the opposite groove walls 411 of the guide groove 40 at.
  • a radially projecting between the two contact tongues 37 fixing lug 41 is formed on the guide pot 31 so that the two contact tongues 37 at the one another facing longitudinal sides over their plastic sheath 38 abut the fixing lug 42.
  • Including the housing-side contact member 26 thus the rotation of the contact tongues 37, formed by the formed on the guide pot 31 fixing lug 42 and the connecting piece 22 formed in the guide groove 40.
  • FIG. 8 illustrated valve according to a second embodiment is largely consistent with the valve described above, so that the same components are denoted by the same reference numerals, but is in the range of in FIG. 8 modified section modified.
  • the piston guide 28 is fixed to the housing and the coupling of the piston 29 of the hydraulic coupler 27 to the actuator 16 as a cardanic bearing 43 to the valve housing side gimbal bearing of the actuator 16.
  • the rotation is made between the actuator-side contact member 25 and the non-rotatably held in the housing-fixed piston guide 28 piston 29.
  • the valve housing side fixing the piston guide 28 is achieved by connecting the recess 32 in the connector 22 inlaid guide pot 31 to the connector 22, z. B.
  • the gimbal bearing 43 is formed by a conical recess 44 in the bolt head 361 of the centering pin 36 inserted into the piston 29 and by a bearing head 45 formed on the actuator 16, which is supported non-positively in the recess 44.
  • the bearing head 45 is integrally formed on the free end of the end body 20 of the Aktors16 projecting pin 201.
  • an axial groove 46 ( FIG. 9 ) formed and at the seated on the pin 201 of the end body 20 actuator-side contact member 25 has a centering nose 47 which engages positively in the axial direction 46 in the circumferential direction.
  • the actuator-side contact member 25 is shown in perspective. It has a plastic body 48 which can be pushed onto the pin 201 of the end body 20 and can be fixed there, on which two contact sheets 49 are fastened.
  • the contact plates 49 are connected to terminal lugs 50, which are guided to the piezo module 19 of the piezoelectric actuator 16.
  • the free ends of the contact tongues 37 of the housing-side contact member are located 26 on the contact plates 49 of the actuator-side contact member 25 and are welded thereto.
  • the axially displaceable and non-rotatable mounting of the piston 29 is achieved in the piston guide 28 by means of a fixed to the piston 29 and piston guide 28 membrane 51 in the hydraulic coupler.
  • the membrane 51 is fastened with its outer edge to the guide pot 31 and with its inner edge on the centering pin 36 and / or on the piston 29, wherein the diaphragm 51 terminates a liquid-tight annular gap (52) between the piston 29 and the piston guide 28.
  • the inner edge of the membrane is z. B. on the centering pin 26, alternatively on the piston 29, welded or clamped by means of the centering pin 36 on the piston 29.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Ventil zum Zumessen eines Mediums, insbesondere eines Fluids, nach dem Oberbegriff des Anspruchs 1.The invention is based on a valve for metering a medium, in particular a fluid, according to the preamble of claim 1.

Ein bekanntes Einspritzventil für ein Fluid ( DE 10 2009 026 532 A1 ) weist ein Ventilgehäuse mit einer Ventilöffnung, eine die Ventilöffnung steuernde Ventilnadel sowie einen piezoelektrischen Aktor zur Ventilnadelbetätigung auf. Zum Ausgleich der unterschiedlichen Wärmeausdehnungskoeffizienten zwischen dem piezoelektrischen Aktor und metallischen Bauteilen des Einspritzventils, insbesondere dem Ventilgehäuse, ist zwischen dem Aktor und einem in das Ventilgehäuse eingesetzten Anschlussstück ein hydraulischer Koppler eingespannt. Der Koppler weist ein Kopplergehäuse mit einer Kolbenführung für einen axial verschieblichen Kolben auf, dessen eine Kolbenseite mit dem Kopplergehäuse einen fluidgefüllten Kopplerspalt begrenzt. Der Kolben ist über eine Membran axial verschieblich und undrehbar am Kopplergehäuse festgesetzt. Das Kopplergehäuse ist starr mit dem Anschlussstück verbunden. Der Aktor besitzt einen zwischen einer Abschlussplatte und einem Abschlusskörper eingespannten Piezomodul. Zwischen der Abschlussplatte des Aktors und der Ventilnadel einerseits und zwischen dem Kolben und dem Kopplergehäuse andererseits ist jeweils ein kardanisches Lager ausgebildet, und der Anschlusskörper des Aktors ist starr mit dem Kolben des Kopplers verbunden. Die elektrische Verbindung zum Piezomodul des Aktors ist über die elektrisch leitenden Teile eines aktorseitigen Kontaktglieds, und eines gehäuseseitigen Kontaktglieds hergestellt, wobei das aktorseitige Kontaktglied an dem Abschlusskörper des Aktors und das gehäuseseitige Kontaktglied auf dem mit dem Ventilgehäuse fest verbundenen Anschlussstück so befestigt sind, dass die elektrisch leitenden Teile der Kontaktglieder einander kontaktieren.A known injection valve for a fluid ( DE 10 2009 026 532 A1 ) has a valve housing with a valve opening, a valve needle controlling the valve opening and a piezoelectric actuator for valve needle actuation. To compensate for the different thermal expansion coefficients between the piezoelectric actuator and metallic components of the injection valve, in particular the valve housing, a hydraulic coupler is clamped between the actuator and a fitting inserted into the valve housing. The coupler has a coupler housing with a piston guide for an axially displaceable piston, whose one piston side with the coupler housing delimits a fluid-filled coupler gap. The piston is axially displaceable and fixed non-rotatably on the coupler housing via a diaphragm. The coupler housing is rigidly connected to the connector. The actuator has a piezo module clamped between an end plate and an end body. Between the end plate of the actuator and the valve needle on the one hand and between the piston and the coupler housing on the other hand, in each case a gimbal bearing is formed, and the connecting body of the actuator is rigidly connected to the piston of the coupler. The electrical connection to the piezoelectric module of the actuator is made via the electrically conductive parts of an actuator-side contact member, and a housing-side contact member, wherein the actuator-side contact member on the closing body of the actuator and the housing-side contact member on the fixedly connected to the valve housing fitting are fixed so that the electrically conductive parts of the contact members contact each other.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Ventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass durch die eine Fixierung der Drehlageposition des Aktors im Ventilgehäuse vornehmende Verdrehsicherung Dreh- oder Torsionsmomente, die im Ventilbetrieb durch Bestromen des zwischen Ventilglied und Ventilgehäuse kardanisch gelagerten Aktors an diesem auftreten, direkt vom Ventilgehäuse aufgenommen werden und nicht auf die elektrische Verbindung zum Aktor wirken. Dadurch werden mechanische Schäden an der elektrischen Verbindung vermieden, und die Standzeit des Ventils wird erhöht. Das Einbeziehen der Kontaktglieder der elektrischen Verbindung zum Aktor in die Verdrehsicherung spart zusätzliche Konstruktions- und Montageschritte und ermöglicht die Senkung der Fertigungskosten. Je nach Art der gehäuseseitigen kardanischen Lagerung des Aktors kann das gehäuseseitige oder das aktorseitige Kontaktglied zur Drehlagefixierung des Aktors eingesetzt werden.The valve according to the invention with the features of claim 1 has the advantage that by the fixing of the rotational position position of the actuator in the valve housing vornehmende rotation torsional or torsional moments that occur in valve operation by energizing the valve member and valve housing gimbaled actuator at this, directly from Valve housing are received and do not affect the electrical connection to the actuator. This avoids mechanical damage to the electrical connection and increases the service life of the valve. The inclusion of the contact members of the electrical connection to the actuator in the anti-rotation saves additional construction and assembly steps and allows the reduction of manufacturing costs. Depending on the type of housing-side gimbal bearing of the actuator, the housing-side or the actuator-side contact member can be used for rotational position fixation of the actuator.

Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruchs 1 angegebenen Ventils möglich.The measures listed in the further claims advantageous refinements and improvements of claim 1 valve are possible.

Gemäß einer vorteilhaften Ausführungsform der Erfindung ist zur ventilgehäuseseitigen kardanischen Lagerung des Aktors die Ankopplung des Kolbens an den Aktor mittels einer starren Verbindung realisiert und die Kolbenführung im Ventilgehäuse kardanisch gelagert. Die Verdrehsicherung ist zwischen dem gehäuseseitigen Kontaktglied und der Kolbenführung hergestellt. Die Einbeziehung des gehäuseseitigen Kontaktglieds in die Verdrehsicherung hat den Vorteil, dass bei dieser mit starrer Verbindung von Aktor und Kolben vorgenommenen kardanischen Lagerung der Kolbenführung im Ventilgehäuse die Verdrehsicherung ohne zuzätzliche Bauteile mit wenig Bearbeitungsaufwand realisiert wird. Bevorzugt wird dabei die kardanische Lagerung zwischen einem die Kolbenführung bildenden, den Kolben aufnehmenden Führungstopf und einem in das Ventilgehäuse eingesetzten Anschlussstück vorgenommen und die Verdrehsicherung durch Führungstopf und gehäuseseitigem Kontaktglied, das auf dem Anschlussstück befestigt wird, dadurch realisiert, dass das gehäuseseitige Kontaktglied am Führungstopf in Umfangsrichtung formschlüssig angreift.According to an advantageous embodiment of the invention, the coupling of the piston to the actuator is realized by means of a rigid connection to the valve housing side gimbal bearing of the actuator and the piston guide mounted in the valve housing gimbal. The rotation is made between the housing-side contact member and the piston guide. The inclusion of the housing-side contact member in the anti-rotation has the advantage that in this made with a rigid connection of actuator and piston cardanic mounting of the piston guide in the valve housing, the rotation without additional components with little processing effort is realized. Preferably, the cardanic bearing between a piston guide forming, the piston receiving guide pot and a fitting inserted into the valve body is made and the rotation through the guide pot and housing-side contact member, which on the connector is fastened, realized by the fact that the housing-side contact member engages the guide pot in the circumferential direction positively.

Gemäß einer vorteilhaften Ausführungsform der Erfindung weist das gehäuseseitige Kontaktglied zwei sich mit Parallelabstand axial erstreckende Kontaktzungen zum Kontaktieren des aktorseitigen Kontaktglieds auf. Die Verdrehsicherung ist durch die Kontaktzungen, eine am Führungstopf ausgeformte, radial zwischen die Kontaktzungen hineinragende Fixiernase und eine im Anschlussstück ohnehin vorhandene axiale Führungsnut für die Kontaktzungen gebildet. Die Kontaktzungen stützen sich einerseits an der Fixiernase und andererseits an den beiden Nutwänden der Führungsnut ab, so dass sich ein Formschluss in Umfangsrichtung zwischen Führungstopf und aktorseitigem Kontaktglied ergibt. Vorteilhaft sind dabei die elektrisch leitenden Kontaktzungen zumindest im Bereich der Fixiernase und Fixiernut mit Kunststoff ummantelt, so dass eine leitende Verbindung zu einem aus Metall hergestellten Führungstopf unterbunden ist.According to an advantageous embodiment of the invention, the housing-side contact member has two with parallel spacing axially extending contact tongues for contacting the actuator-side contact member. The rotation is formed by the contact tongues, a formed on the guide pot, radially projecting between the contact tongues Fixiernase and an existing in the connector anyway axial guide groove for the contact tongues. The contact tongues are based on the one hand on the fixing lug and on the other hand on the two groove walls of the guide groove, so that there is a positive connection in the circumferential direction between the guide pot and aktorseitigem contact member. Advantageously, the electrically conductive contact tongues are encased with plastic, at least in the region of the fixing nose and fixing groove, so that a conductive connection to a guide pot made of metal is prevented.

Gemäß einer alternativen Ausführungsform der Erfindung ist zur gehäuseseitigen kardanischen Lagerung des Aktors die Kolbenführung gehäusefest und die Ankopplung des Kolbens an den Aktor als kardanisches Lager ausgebildet. Die Verdrehsicherung ist zwischen dem aktorseitigen Kontaktglied und dem Kolben hergestellt.According to an alternative embodiment of the invention, the piston guide is fixed to the housing and the coupling of the piston to the actuator as a cardanic bearing for housing side gimbal bearing of the actuator. The rotation is made between the actuator-side contact member and the piston.

Die Verlegung der kardanischen Lagerung weg von Kolbenführung des Kopplers und Ventilgehäuse hin zu Aktor und Kolben des Kopplers vermeidet eine konstruktive Kollision zwischen dem kardanischen Lager und der Hinführung der elektrisch leitenden Teile des gehäuseseitigen Kontaktglieds zum aktorseitigen Kontaktglied, die einen Durchbruch im kardanischen Lager erfordern und damit dessen mechanische Stabilität schwächen würde. Durch die damit einhergehende gehäuseseitige Festlegung der Kolbenführung reduzieren sich auch bei radialen Beschleunigungen die auf den Kolben wirkenden Radialkräfte. Zudem wird ein verbesserter Wärmeübergang vom Koppler zum Ventilgehäuse erzielt. Infolge dieser kardanischen Lagerung des Aktors bietet das aktorseitige Kontaktglied eine konstruktiv vorteilhafte Voraussetzung zur Realisierung der Verdrehsicherung für den Aktor.The displacement of the gimbal bearing away from the piston guide of the coupler and valve housing towards the actuator and piston of the coupler avoids a constructive collision between the gimbal bearing and the lead of the electrically conductive parts of the housing-side contact member to the actuator-side contact member, which require an opening in the gimbal bearing and thus whose mechanical stability would weaken. Due to the associated housing-side fixing of the piston guide, the radial forces acting on the piston are reduced even with radial accelerations. In addition, an improved heat transfer from the coupler to the valve housing is achieved. As a result of this gimbal bearing of the actuator, the actuator-side contact member provides a structurally advantageous condition for the realization of the rotation of the actuator.

Gemäß einer vorteilhaften Ausführungsform der Erfindung ist das kardanische Lager von einer kegelförmigen Vertiefung in einem mit dem Kolben verbundenen koaxialen Zentrierbolzen einerseits und einem am Aktor ausgeformten Lagerkopf andererseits gebildet, der sich kraftschlüssig in der Vertiefung des Zentrierbolzens abstützt. Die Verdrehsicherung weist eine Axialnut und eine in die Axialnut in Umfangsrichtung mit geringem Spiel formschlüssig eingreifende Zentriernase auf, wobei Axialnut und Zentriernase auf Zentrierbolzen und aktorseitiges Kontaktglied aufgeteilt sind, also entweder die Axialnut im Zentrierbolzen und die Zentriernase am aktorseitigen Kontaktglied oder umgekehrt die Axialnut am aktorseitigen Kontaktglied und die Zentriernase im Zentierbolzen angeordnet ist. Durch diese konstruktiven Maßnahmen wird ohne zusätzliche Bauelemente mit minimalem Bearbeitungsaufwand eine die Drehlageposition des Aktors zuverlässig fixierende Verdrehsicherung zwischen dem aktorseitigen Kontaktglied und dem Kolben des Kopplers hergestellt, der seinerseit undrehbar in der im Ventilgehäuse festgelegten Kolbenführung gehalten ist.According to an advantageous embodiment of the invention, the gimbal bearing is formed by a conical recess in a coaxial centering pin connected to the piston on the one hand and a bearing head formed on the actuator on the other hand, which is non-positively supported in the recess of the centering pin. The anti-rotation has an axial groove and in the axial groove in the circumferential direction with little play positively engaging centering, whereby axial groove and centering are divided on centering and aktorseitiges contact member, so either the axial groove in the centering pin and the centering on aktorseitigen contact member or vice versa the axial groove on the actuator side Contact member and the centering nose is arranged in Zentierbolzen. These constructive measures a rotational position of the actuator reliably fixing rotational position between the actuator-side contact member and the piston of the coupler is made without additional components with minimal processing effort, which is held in rotation rotatably in the fixed in the valve housing piston guide.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Erfindung ist anhand von in den Zeichnungen dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

  • Figur 1 ausschnittweise einen Längsschnitt eines Ventils zum Zumessen eines Fluids,
  • Figur 2 eine vergrößerte Darstellung des Ausschnitts A in Figur 1,
  • Figur 3 einen Schnitt längs der Linie III - III in Figur 2,
  • Figur 4 eine vergrößerte Darstellung des Ausschnitts IV in Figur 3,
  • Figur 5 eine Draufsicht eines gehäuseseitigen Kontaktglieds im Ventil gemäß Figur 1 bis 4,
  • Figur 6 einen Schnitt längs der Linie VI - VI in Figur 5,
  • Figur 7 einen vergrößerten Längsschnitt eines Anschlussstücks im Ventil gemäß Figur 1 bis 4,
  • Figur 8 eine vergrößerte Darstellung des Ausschnitts A in Figur 1 eines gegenüber dem Ventil gemäß Figur 1 modifizierten Ventils,
  • Figur 9 einen Schnitt längs der Linie IX- IX in Figur 8 bei entferntem gehäuseseitigen Kontaktglied,
  • Figur 10 eine perspektivische Ansicht eines aktorseitigen Kontaktglieds im Ventil gemäß Figur 8 und 9.
The invention is explained in more detail in the following description with reference to exemplary embodiments illustrated in the drawings. Show it:
  • FIG. 1 1 is a longitudinal section of a valve for metering a fluid,
  • FIG. 2 an enlarged view of the section A in FIG. 1 .
  • FIG. 3 a section along the line III - III in FIG. 2 .
  • FIG. 4 an enlarged view of the section IV in FIG. 3 .
  • FIG. 5 2 a top view of a housing-side contact element in the valve according to FIGS. 1 to 4,
  • FIG. 6 a section along the line VI - VI in FIG. 5 .
  • FIG. 7 an enlarged longitudinal section of a fitting in the valve according to Figure 1 to 4 .
  • FIG. 8 an enlarged view of the section A in FIG. 1 one opposite the valve according to FIG. 1 modified valve,
  • FIG. 9 a section along the line IX-IX in FIG. 8 with the housing-side contact member removed,
  • FIG. 10 a perspective view of an actuator-side contact member in the valve according to FIGS. 8 and 9 ,

Das in Figur 1 im Längsschnitt dargestellte Ventil zum Zumessen eines Mediums, insbesondere eines Fluids, wird beispielsweise als Einspritzventil zum Einspritzen von Kraftstoff in den Verbrennungszylinder einer Brennkraftmaschine eingesetzt. Das Ventil weist ein hohlzylindrischen Ventilgehäuse 11 auf, dessen eines Stirnende von einem eine Zumessöffnung 13 aufweisenden Düsenkörper 12 abgeschlossen ist. Die Zumessöffnung 13 wird von einem nach außen öffnenden Ventilglied 14, das als Ventilnadel mit Schließkopf ausgebildet ist, gesteuert, also geschlossen oder freigegeben. Das Ventilglied 14 wird von einem piezoelektrischen Aktor 16 gegen die Rückstellkraft einer an dem Ventilglied 14 und am Düsenkörper 12 sich abstützenden Rückstellfeder 15 betätigt, wobei entsprechend der Größe einer an dem piezoelektrischen Aktor 16 anliegenden elektrischen Spannung das Ventilglied 14 über seinen Schließkopf die Zumessöffnung 13 mehr oder weniger freigibt. Der Aktor 16 besitzt einen elektrisch ansteuerbaren Piezomodul 19, der mittels eines als Feder ausgebildeten Hohlkörpers 21 zwischen einer Abschlussplatte 18 und einem Abschlusskörper 20 eingespannt ist. Der Aktor 16 greift dabei über ein kardanisches Lager 17 an dem Ventilglied 14 an, wobei das kardanische Lager 17 zwischen dem schließkopffernen Ende der Ventilnadel des Ventilglieds 14 und der Abschlussplatte 18 des Aktors 16 ausgebildet ist.This in FIG. 1 shown in longitudinal section valve for metering a medium, in particular a fluid is used for example as an injection valve for injecting fuel into the combustion cylinder of an internal combustion engine. The valve has a hollow cylindrical valve housing 11, one end of which is closed by a nozzle body 12 having an orifice 13. The orifice 13 is controlled by an outwardly opening valve member 14, which is designed as a valve needle with a closing head, ie closed or released. The valve member 14 is actuated by a piezoelectric actuator 16 against the restoring force of a valve member 14 and on the nozzle body 12 supporting return spring 15, wherein according to the size of an applied voltage to the piezoelectric actuator 16, the valve member 14 via its closing head the orifice 13 more or less releases. The actuator 16 has an electrically controllable piezo module 19, which is clamped by means of a spring body formed as a hollow body 21 between a cover plate 18 and a closing body 20. The actuator 16 engages via a gimbal bearing 17 on the valve member 14, wherein the gimbal bearing 17 is formed between the Schließkopffernen end of the valve needle of the valve member 14 and the end plate 18 of the actuator 16.

In das vom Düsenkörper 12 abgekehrte Ende des Ventilgehäuses 11 ist ein Anschlussstück 22 eingesetzt, das mit einem Fluidanschluss 23 und einem elektrischen Anschlussstecker 24 versehen ist. Vom Anschlussstecker 24 ist mittels eines aktorseitigen Kontaktglieds 25 und eines gehäuseseitigen Kontaktglieds 26 eine elektrische Verbindung zum Piezomodul 20 des Aktors 16 hergestellt. Die elektrisch leitenden Teile der beiden Kontaktglieder 25, 26 kontaktieren einander und sind an den Kontaktstellen miteinander verschweißt. Alternativ können die einander kontaktierenden Teile beider Kontaktglieder 25,26 auch miteinander einstückig, die elektrisch leitenden Teile also einteilig, ausgeführt werden.In the remote from the nozzle body 12 end of the valve housing 11, a connector 22 is inserted, which is provided with a fluid connection 23 and an electrical connector 24. From the connector 24 is by means of an actuator-side contact member 25 and a housing-side contact member 26th made an electrical connection to the piezo module 20 of the actuator 16. The electrically conductive parts of the two contact members 25, 26 contact each other and are welded together at the contact points. Alternatively, the contacting parts of both contact members 25,26 also integrally with each other, the electrically conductive parts so one piece, running.

Auf der vom Ventilglied 14 abgekehrten Seite des Aktors 16 ist ein hydraulischer Koppler 27 angeordnet, über den sich der Aktor 16 am Ventilgehäuse 11, genauer gesagt an dem fest mit dem Ventilgehäuse 11 verbundenen Anschlussstück 22, abstützt. Aktor 16 und Koppler 27 sind in einem Rohr 53 aufgenommen, das einerseits am Düsenkörper 12 und andererseits am Anschlussstück 22 befestigt, z. B. verschweißt, ist. Zwischen dem Rohr 53 und dem Ventilgehäuse 11 verbleibt ein Ringspalt 54, über den eine Verbindung von dem Fluidzulauf 23 zum Innern des Düsenkörpers 12 besteht, in dem die Ventilnadel des Ventilglieds 14 axial verschieblich geführt ist. Der hydraulische Koppler 27 weist eine Kolbenführung 28 und einen darin axial verschieblichen, undrehbar gehaltenen Kolben 29 auf, der einen flüssigkeitsgefüllten Kopplerspalt 30 begrenzt. In den dargestellten Ausführungsbeispielen ist die Kolbenführung 28 von einem Führungstopf 31 gebildet, der in einer becherförmigen Ausnehmung 32 im Anschlussstück 22 aufgenommen ist. Der Kopplerspalt 30 steht über eine Bohrung 33 im Topfboden des Führungstopfes 31 mit einem Ausgleichsraum 34 in Verbindung, der von dem Topfboden und einer außen den Topfboden überspannenden und an der Außenwand des Führungstopfes 31 festgelegten Membran 35 begrenzt ist.On the side facing away from the valve member 14 side of the actuator 16, a hydraulic coupler 27 is arranged, via which the actuator 16 on the valve housing 11, more precisely on the fixedly connected to the valve housing 11 connecting piece 22 is supported. Actuator 16 and coupler 27 are received in a tube 53, which on the one hand on the nozzle body 12 and on the other hand attached to the connector 22, z. B. welded, is. Between the tube 53 and the valve housing 11 remains an annular gap 54 through which there is a connection from the fluid inlet 23 to the interior of the nozzle body 12, in which the valve needle of the valve member 14 is guided axially displaceable. The hydraulic coupler 27 has a piston guide 28 and an axially displaceable, non-rotatably held piston 29 which defines a liquid-filled coupler gap 30. In the illustrated embodiments, the piston guide 28 is formed by a guide pot 31 which is received in a cup-shaped recess 32 in the connecting piece 22. The coupler gap 30 is connected via a bore 33 in the pot bottom of the guide pot 31 with a compensation chamber 34 in connection, which is bounded by the pot bottom and a outside the pot bottom spanning and fixed to the outer wall of the guide pot 31 membrane 35.

Im Betrieb des Ventils treten an dem ventilgliedseitig und ventilgehäuseseitig jeweils kardanisch aufgehängten oder gelagerten piezoelektrischen Aktor 16 Torsions- oder Drehmomente auf, die zu einer Schädigung der elektrisch Verbindung zum Piezomodul 19 des Aktors 16 führen können. Um diese Drehmomente am Ventilgehäuse 11 abzufangen und damit von den elektrisch leitenden, einander kontaktierenden Teilen der Kontaktglieder 25, 26 fernzuhalten, ist eine den Aktor 16 in seiner Drehlageposition fixierende Verdrehsicherung vorgesehen, wobei jeweils eines der Kontaktglieder 25, 26 der elektrischen Verbindung zum Aktor 16 in die Verdrehsicherung einbezogen ist. Je nach Ausführung der ventilgehäuseseitigen kardanischen Lagerung des Aktors 16 ist die Verdrehsicherung am gehäuseseitigen Kontaktglied 26 oder am aktorseitige Kontaktglied 25 festgemacht.During operation of the valve occur on the valve member side and valve housing side each gimbaled or mounted piezoelectric actuator 16 torsional or torques, which can lead to damage to the electrical connection to the piezo module 19 of the actuator 16. In order to intercept these torques on the valve housing 11 and thus to keep away from the electrically conductive, contacting parts of the contact members 25, 26, an actuator 16 is provided in its rotational position fixing anti-rotation, each one of the contact members 25, 26 of the electrical connection to the actuator 16 included in the rotation. Depending on the design of the valve housing side gimbal bearing of the actuator 16, the rotation on the housing-side contact member 26 or on the actuator-side contact member 25 is fixed.

Im Ausführungsbeispiel des Ventils gemäß Figur 1 bis 7 ist zur gehäuseseitigen kardanischen Lagerung des Aktors 16 die Kolbenführung 28 im Ventilgehäuse 11, genauer gesagt der in der becherförmigen Ausnehmung 32 des Anschlussstücks 22 einliegende Führungstopf 31 an dem fest mit dem Ventilgehäuse 11 verbundenen Anschlussstück 22, kardanisch gelagert und die Ankopplung des Kolbens 29 an den Aktor 16 mittels einer starren Verbindung realisiert. Die Verdrehsicherung ist zwischen dem gehäuseseitigen Kontaktglied 26 und der Kolbenführung 28, also dem Führungstopf 31, ausgebildet. Zur Herstellung der starren Verbindung ist in den Kolben 29 ein zentraler Zentrierbolzen 36 mit einem vom Kolben 29 abstehenden, hohlen Bolzenkopf 361 eingesetzt und der Abschlusskörper 20 des Aktors 16 mit einem axial abstehenden Zapfen 201 versehen, der mit einem im Durchmesser reduzierten Endabschnitt in den hohlen Bolzenkopf 361 eingepresst ist. Auf dem Zapfen 201 ist das aktorseitige Kontaktglied 25 befestigt. Das gehäuseseitige Kontaktglied 26 ist am Anschlussstück 22 festgelegt und greift zur Ausbildung der Verdrehsicherung in Umfangsrichtung formschlüssig am Führungstopf 31 an.In the embodiment of the valve according to Figure 1 to 7 for the housing side gimbal bearing of the actuator 16, the piston guide 28 in the valve housing 11, more precisely, in the cup-shaped recess 32 of the fitting 22 inlaid guide pot 31 on the fixedly connected to the valve housing 11 connecting piece 22, gimbals and the coupling of the piston 29 to the Actuator 16 realized by means of a rigid connection. The rotation is formed between the housing-side contact member 26 and the piston guide 28, so the guide pot 31. To produce the rigid connection, a central centering pin 36 with a protruding from the piston 29, hollow bolt head 361 is inserted into the piston 29 and the closing body 20 of the actuator 16 is provided with an axially projecting pin 201, with a reduced diameter end portion in the hollow Bolt head 361 is pressed. On the pin 201, the actuator-side contact member 25 is attached. The housing-side contact member 26 is fixed to the connecting piece 22 and engages the formation of the rotation in the circumferential direction positively on the guide pot 31.

Das gehäuseseitige Kontaktglied 26 ist in Figur 5 in Draufsicht und in Figur 6 im Längsschnitt dargestellt. Es weist zwei sich im Parallelabstand axial erstreckende, die elektrisch leitenden Teile des gehäuseseitigen Kontaktglieds 26 bildende Kontaktzungen 37 auf. Die Kontaktzungen 37 sind mit einem Kunststoffmantel 38 umspritzt und über eine Kunststoffbrücke 55 zusammengehalten, wobei die die elektrisch leitenden Teile des aktorseitigen Kontaktglieds 25 kontaktierenden freien Enden der Kontaktzungen 37 von der Kunststoffummantelung ausgenommen sind. Das gehäuseseitige Kontaktglied 26 ist in das in Figur 7 im Längsschnitt vergrößert dargestellte Anschlussstück 22 eingesetzt. Das Anschlussstück 22 enthält hierzu zwei parallele Längsbohrungen 39 und eine im Bereich seiner Ausnehmung 32 verlaufende, in die beiden Längsbohrungen 39 hineinragende Führungsnut 40 (vgl. auch Figur 4), in der die beiden Kontaktzungen 37 mit einem Zungenabschnitt I (Figur 6) einliegen. Wie der Querschnitt gemäß Figur 3 und besser dessen vergrößerte Ausschnitt in Figur 4 zeigen, liegen die beiden Kontaktzungen 37 auf voneinander abgekehrten Längsseiten im Zungenabschnitt I über ihren Kunststoffmantel 38 an den einander gegenüberliegenden Nutwänden 411 der Führungsnut 40 an. Wie aus Figur 3 und 4 ersichtlich, ist am Führungstopf 31 eine radial zwischen die beiden Kontaktzungen 37 hineinragende Fixiernase 41 so ausgeformt, dass die beiden Kontaktzungen 37 an den einander zugekehrten Längsseiten über ihren Kunststoffmantel 38 an der Fixiernase 42 anliegen. Unter Einbeziehung des gehäuseseitigen Kontaktglieds 26 wird somit die Verdrehsicherung von den Kontaktzungen 37, von der am Führungstopf 31 ausgeformten Fixiernase 42 und der im Anschlussstück 22 ausgebildeten Führungsnut 40 gebildet.The housing-side contact member 26 is in FIG. 5 in plan view and in FIG. 6 shown in longitudinal section. It has two contact tongues 37 which extend axially in the parallel spacing and form the electrically conductive parts of the housing-side contact member 26. The contact tongues 37 are encapsulated with a plastic sheath 38 and held together by a plastic bridge 55, wherein the electrically conductive parts of the actuator-side contact member 25 contacting free ends of the contact blades 37 are excluded from the plastic sheath. The housing-side contact member 26 is in the in FIG. 7 in longitudinal section enlarged connector shown 22 inserted. For this purpose, the connecting piece 22 contains two parallel longitudinal bores 39 and a guide groove 40 which extends in the region of its recess 32 and projects into the two longitudinal bores 39 (cf. FIG. 4 ), in which the two contact tongues 37 with a tongue section I ( FIG. 6 ) einliegen. Like the cross section according to FIG. 3 and better its enlarged detail in FIG FIG. 4 show, the two contact tongues 37 are on remote from one another longitudinal sides in the tongue section I on their plastic sheath 38 on the opposite groove walls 411 of the guide groove 40 at. How out FIGS. 3 and 4 can be seen, a radially projecting between the two contact tongues 37 fixing lug 41 is formed on the guide pot 31 so that the two contact tongues 37 at the one another facing longitudinal sides over their plastic sheath 38 abut the fixing lug 42. Including the housing-side contact member 26 thus the rotation of the contact tongues 37, formed by the formed on the guide pot 31 fixing lug 42 and the connecting piece 22 formed in the guide groove 40.

Das ausschnittweise in Figur 8 dargestellte Ventil gemäß einem zweiten Ausführungsbeispiel stimmt weitgehend mit dem zuvor beschriebene Ventil überein, so dass gleiche Bauteile mit den gleichen Bezugszeichen gekennzeichnet sind, ist jedoch im Bereich des in Figur 8 dargestellten Ausschnitts modifiziert. Bei diesem Ventil ist zur ventilgehäuseseitigen kardanischen Lagerung des Aktors 16 die Kolbenführung 28 gehäusefest und die Ankopplung des Kolbens 29 des hydraulischen Kopplers 27 an den Aktor 16 als kardanisches Lager 43 ausgeführt. Die Verdrehsicherung ist zwischen dem aktorseitigen Kontaktglied 25 und dem undrehbar in der gehäusefesten Kolbenführung 28 gehaltenen Kolben 29 hergestellt. Die ventilgehäuseseitige Festlegung der Kolbenführung 28 wird durch Anbindung des in der Ausnehmung 32 im Anschlussstück 22 einliegenden Führungstopfes 31 an das Anschlussstück 22 erzielt, z. B. dadurch, dass der radial und axial in der Ausnehmung 32 zentrierte Führungstopf 31 am Anschlussstück 22 festgeschweißt wird. Das kardanische Lager 43 ist von einer kegelförmigen Vertiefung 44 im Bolzenkopf 361 des in den Kolben 29 eingesetzten Zentrierbolzens 36 und von einem am Aktor 16 ausgebildeten Lagerkopf 45 gebildet, der sich kraftschlüssig in der Vertiefung 44 abstützt. Der Lagerkopf 45 ist an das freie Ende des vom Abschlusskörper 20 des Aktors16 abstehenden Zapfens 201 angeformt. Zur Herstellung der Verdrehsicherung ist im Zentrierbolzen 36, genauer gesagt in dem am Zentrierbolzen 36 vorstehenden Bolzenkopf 361, eine Axialnut 46 (Figur 9) ausgeformt und an dem auf dem Zapfen 201 des Abschlusskörpers 20 sitzenden aktorseitigen Kontaktglied 25 eine Zentriernase 47 vorhanden, die in die Axialnut 46 in Umfangsrichtung formschlüssig eingreift.The cut-out in FIG. 8 illustrated valve according to a second embodiment is largely consistent with the valve described above, so that the same components are denoted by the same reference numerals, but is in the range of in FIG. 8 modified section modified. In this valve, the piston guide 28 is fixed to the housing and the coupling of the piston 29 of the hydraulic coupler 27 to the actuator 16 as a cardanic bearing 43 to the valve housing side gimbal bearing of the actuator 16. The rotation is made between the actuator-side contact member 25 and the non-rotatably held in the housing-fixed piston guide 28 piston 29. The valve housing side fixing the piston guide 28 is achieved by connecting the recess 32 in the connector 22 inlaid guide pot 31 to the connector 22, z. B. in that the radially and axially centered in the recess 32 guide pot 31 is welded to the connecting piece 22. The gimbal bearing 43 is formed by a conical recess 44 in the bolt head 361 of the centering pin 36 inserted into the piston 29 and by a bearing head 45 formed on the actuator 16, which is supported non-positively in the recess 44. The bearing head 45 is integrally formed on the free end of the end body 20 of the Aktors16 projecting pin 201. To produce the anti-rotation is in the centering pin 36, more precisely in the protruding on the centering pin 36 bolt head 361, an axial groove 46 ( FIG. 9 ) formed and at the seated on the pin 201 of the end body 20 actuator-side contact member 25 has a centering nose 47 which engages positively in the axial direction 46 in the circumferential direction.

In Figur 10 ist das aktorseitige Kontaktglied 25 perspektivisch dargestellt. Es weist einen auf den Zapfen 201 des Abschlusskörpers 20 aufschiebbaren und dort festsetzbaren Kunststoffkörper 48 auf, an dem zwei Kontaktbleche 49 befestigt sind. Die Kontaktbleche 49 sind mit Anschlussfahnen 50 verbunden, die zum Piezomodul 19 des piezoelektrischen Aktors 16 geführt sind. Bei endmontiertem Ventil liegen die freien Enden der Kontaktzungen 37 des gehäuseseitigen Kontaktglieds 26 auf den Kontaktblechen 49 des aktorseitigen Kontaktglieds 25 auf und sind mit diesen verschweißt.In FIG. 10 the actuator-side contact member 25 is shown in perspective. It has a plastic body 48 which can be pushed onto the pin 201 of the end body 20 and can be fixed there, on which two contact sheets 49 are fastened. The contact plates 49 are connected to terminal lugs 50, which are guided to the piezo module 19 of the piezoelectric actuator 16. When the valve is final, the free ends of the contact tongues 37 of the housing-side contact member are located 26 on the contact plates 49 of the actuator-side contact member 25 and are welded thereto.

Wie aus Figur 2 und Figur 8 ersichtlich ist, wird im hydraulischen Koppler die axial verschieblich und undrehbare Halterung des Kolbens 29 in der Kolbenführung 28 mittels einer an Kolben 29 und Kolbenführung 28 festgelegten Membran 51 erreicht. Die Membran 51 ist hierzu mit ihrem äußeren Rand am Führungstopf 31 und mit ihrem inneren Rand am Zentrierbolzen 36 und/oder am Kolben 29 befestigt, wobei die Membran 51 einen zwischen dem Kolben 29 und der Kolbenführung 28 vorhandenen Ringspalt (52) flüssigkeitsdicht abschließt. Der innere Membranrand ist z. B. am Zentrierbolzen 26, alternativ am Kolben 29, verschweißt oder mittels des Zentrierbolzens 36 am Kolben 29 eingespannt.How out FIG. 2 and FIG. 8 it can be seen, the axially displaceable and non-rotatable mounting of the piston 29 is achieved in the piston guide 28 by means of a fixed to the piston 29 and piston guide 28 membrane 51 in the hydraulic coupler. For this purpose, the membrane 51 is fastened with its outer edge to the guide pot 31 and with its inner edge on the centering pin 36 and / or on the piston 29, wherein the diaphragm 51 terminates a liquid-tight annular gap (52) between the piston 29 and the piston guide 28. The inner edge of the membrane is z. B. on the centering pin 26, alternatively on the piston 29, welded or clamped by means of the centering pin 36 on the piston 29.

Claims (10)

  1. Valve for metering a medium, in particular a fluid, having a valve housing (11) which has a metering opening (13), having a valve element (14) which controls the metering opening (13), having an electrically activatable piezoelectric actuator (16) for actuating the valve element, said actuator being cardanically mounted in each case at the valve element side and at the valve housing side, having a hydraulic coupler (27) which is arranged on that side of the actuator (16) which is averted from the valve element (14), which hydraulic coupler has a piston guide (28) and has a piston (29) which is held in axially displaceable and non-rotatable fashion in the piston guide (28) and which delimits a liquid-filled coupler gap (30) and which is coupled to the actuator (16), and having an electrical connection which is led to the actuator (16) for the activation thereof, which electrical connection has an actuator-side contact element (25) and, making contact therewith, a housing-side contact element (26), characterized in that a rotation prevention means is provided which fixes the actuator (16) in its rotational position, and one of the contact elements (25, 26) is incorporated into the rotation prevention means.
  2. Valve according to Claim 1, characterized in that, for the cardanic mounting of the actuator (16) at the valve housing side, the coupling of the piston (29) to the actuator (16) is realized by means of a rigid connection and the piston guide (28) is cardanically mounted in the valve housing (11), and in that the rotation prevention means is formed between the housing-side contact element (26) and the piston guide (28).
  3. Valve according to Claim 2, characterized in that the piston guide (28) is formed by a guide pot (31) which lies in a cup-shaped recess (32) of an attachment piece (22) fixedly inserted into the valve housing (11) and which is cardanically mounted on the attachment piece (22), and in that the housing-side contact element (26) is fixed to the attachment piece (22) and, to form the rotation prevention means, engages in positively locking fashion in a circumferential direction on the guide pot (31).
  4. Valve according to Claim 3, characterized in that the housing-side contact element (26) has two contact tongues (37) which extend axially in parallel with a spacing and which serve for the contacting of the actuator-side contact element (25), and in that the rotation prevention means is formed by the contact tongues (37), by a fixing lug (42) which protrudes from the guide pot (31) and which projects radially in between the contact tongues (37), and by an axial guide groove (40), formed in the attachment piece (22), for the contact tongues (37), which axial guide groove, by way of its groove walls (411), supports the two contact tongues (37) at least in a tongue section (l) at their longitudinal sides averted from the fixing lug (42).
  5. Valve according to Claim 4, characterized in that the contact tongues (37), which are composed of electrically conductive material, are surrounded with a plastics casing (38) at least in the region of fixing lug (42) and guide groove (40).
  6. Valve according to Claim 1, characterized in that, for the cardanic mounting of the actuator (16) at the housing side, the piston guide (28) is fixed with respect to the housing and the coupling of the piston (29) to the actuator (16) is in the form of a cardanic bearing (43), and in that the rotation prevention means is formed between the actuator-side contact element (25) and the piston (29).
  7. Valve according to Claim 6, characterized in that the cardanic bearing (43) is formed by a conical depression (44) in a central centring bolt (36) which is connected to the piston (29) and by a bearing head (45) which is formed on the actuator (16) and which is supported in non-positively locking fashion in the depression (44), and in that the rotation prevention means has an axial groove (46) and a centring lug (47) which engages in positively locking fashion in a circumferential direction into the axial groove (46), and the axial groove (46) and centring lug (47) are formed alternately on the centring bolt (36) and on the actuator-side contact element (25).
  8. Valve according to Claim 7, characterized in that the piezoelectric actuator (16) has a piezo module (19) which is braced between a closure plate (18), which bears against the valve element (14), and a closure body (20), and in that a peg (201) which supports the actuator-side contact element (25) projects axially from the closure body (20), on the free end of which peg the bearing head (45) is formed.
  9. Valve according to one of Claims 6 to 8, characterized in that the piston guide (28) is formed by a guide pot (31) which is fixed in a cup-shaped recess (32) of an attachment piece (22) which is fixedly inserted into the valve housing (11), and in that the housing-side contact element (26) is fastened to the attachment piece (22).
  10. Valve according to one of Claims 1 to 9, characterized in that the piston (29) is held in non-rotatable and axially displaceable fashion in the piston guide (28) by means of a diaphragm (51) which is fixed to the piston (29) and to the piston guide (28) and which covers an annular gap (52) which is present between the piston (29) and piston guide (28).
EP12705693.5A 2011-03-28 2012-02-24 Valve for metering a medium Not-in-force EP2691632B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110006202 DE102011006202A1 (en) 2011-03-28 2011-03-28 Valve for metering a medium
PCT/EP2012/053201 WO2012130538A1 (en) 2011-03-28 2012-02-24 Valve for metering a medium

Publications (2)

Publication Number Publication Date
EP2691632A1 EP2691632A1 (en) 2014-02-05
EP2691632B1 true EP2691632B1 (en) 2015-08-12

Family

ID=45757019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12705693.5A Not-in-force EP2691632B1 (en) 2011-03-28 2012-02-24 Valve for metering a medium

Country Status (4)

Country Link
EP (1) EP2691632B1 (en)
CN (1) CN103459821B (en)
DE (1) DE102011006202A1 (en)
WO (1) WO2012130538A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012214331A1 (en) 2012-08-10 2014-02-13 Robert Bosch Gmbh Method for providing electrical interconnection between electrically conductive elements by resistance welding, involves providing pressing force to electrode array and generating welding current between electrodes
DE102013202920A1 (en) 2013-02-22 2014-08-28 Robert Bosch Gmbh Valve for injecting liquid fuel into combustion chamber, has valve seat body at whose combustion-chamber-sided end, valve seat surrounding valve opening is formed, where sleeve is fitted on body area of valve seat body
DE102013203681A1 (en) 2013-03-05 2014-09-11 Robert Bosch Gmbh Valve for injecting fluid fuel
DE102013204103A1 (en) 2013-03-11 2014-09-11 Robert Bosch Gmbh Method for controlling an injection valve
WO2020193538A1 (en) * 2019-03-24 2020-10-01 Robert Bosch Gmbh Expansion valve

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10317148B4 (en) * 2003-04-14 2020-10-01 Robert Bosch Gmbh Fuel injector
DE10333696A1 (en) * 2003-07-24 2005-02-24 Robert Bosch Gmbh Fuel injector
DE102006013958B4 (en) * 2006-03-27 2016-11-10 Robert Bosch Gmbh Fuel injector
DE102006017927A1 (en) * 2006-04-18 2007-10-25 Robert Bosch Gmbh Fuel injection valve for external-ignited internal-combustion engine, has actuator staying in effective connection with valve body, and balancing volume formed at flow-off-side of actuator, where volume is filled with fuel
DE102006036447A1 (en) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injector for a fuel injection system
US7665445B2 (en) * 2008-04-18 2010-02-23 Caterpillar Inc. Motion coupler for a piezoelectric actuator
JP5382320B2 (en) * 2009-03-26 2014-01-08 セイコーエプソン株式会社 Piezoelectric motor, liquid ejecting apparatus and clock
DE102009026532A1 (en) 2009-05-28 2010-12-02 Robert Bosch Gmbh Fluid e.g. oil, injection valve for internal combustion engine, has piston and housing connected by diaphragm, which limits balancing area connected with gap and running over channel in piston and containing throttle point

Also Published As

Publication number Publication date
WO2012130538A1 (en) 2012-10-04
DE102011006202A1 (en) 2012-10-04
CN103459821A (en) 2013-12-18
CN103459821B (en) 2016-05-11
EP2691632A1 (en) 2014-02-05

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