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EP2798195A1 - Lever device and a fuel injection valve - Google Patents

Lever device and a fuel injection valve

Info

Publication number
EP2798195A1
EP2798195A1 EP12813825.2A EP12813825A EP2798195A1 EP 2798195 A1 EP2798195 A1 EP 2798195A1 EP 12813825 A EP12813825 A EP 12813825A EP 2798195 A1 EP2798195 A1 EP 2798195A1
Authority
EP
European Patent Office
Prior art keywords
lever
housing
coupled
injection valve
planar wall
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
EP12813825.2A
Other languages
German (de)
French (fr)
Other versions
EP2798195B1 (en
Inventor
Stefan Lehmann
Hellmut Freudenberg
Stefan Kohn
Robert Kuchler
Manuel Hannich
Roland Feigl
Wolfgang Wechler
Matthias Wicke
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2798195A1 publication Critical patent/EP2798195A1/en
Application granted granted Critical
Publication of EP2798195B1 publication Critical patent/EP2798195B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M61/04—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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M63/0014—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
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
    • F02M2200/702—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical with actuator and actuated element moving in different directions, e.g. in opposite directions

Definitions

  • the invention relates to a lever device for an injection valve having a housing, at least one lever element, a drive element and an output element.
  • the invention further relates to an injection valve for an internal combustion engine of a motor vehicle, which comprises the lever device and a valve needle which is coupled to the output element or which forms the output element.
  • Injection valves for an internal combustion engine of a motor vehicle may have actuators which are designed in particular as piezoactuators.
  • Such actuators have a piezoceramic material.
  • Such actuators may change their longitudinal extent depending on an electric field acting in the piezoceramic material.
  • a lever device can be provided which translates the stroke of the actuator.
  • Piezoelectric actuators which are used as actuators, in particular in injection valves for internal combustion engines in motor vehicles, are arranged in a housing so that a lifting movement in the axial direction can be performed.
  • the object of the invention is to provide a lever device for an injection valve, which is permanently reliable.
  • the object is also to provide an injection valve, which has a long life.
  • the invention is characterized by a lever device for an injection valve, with a housing having a housing recess, at least one lever element which is arranged in the housing recess, a drive element which is arranged in the housing recess and with the at least one Lever element is coupled to act on the at least one lever element in the direction of a
  • the output element is coupled to the at least one lever element such that the
  • Output element by means of the at least one lever element in the direction of the force action axis is movable.
  • the at least one lever element has a coupling section which is designed or arranged such that the at least one lever element is coupled to the housing or the driven element in a rotationally fixed manner with respect to the force action axis.
  • the at least one lever element is rotationally fixed with respect to the housing or the driven element with respect to the force axis of action.
  • the coupling portion of the lever member on a flat wall portion, and the output element has a flat wall portion.
  • the plane Wall portion of the lever member cooperates with the planar wall portion of the output element such that the at least one lever element is rotatably coupled to the output element with respect to the force action axis.
  • planar wall section of the lever element and the planar wall section of the output element are in particular planar in a plane which is approximately plane-parallel to the force action axis.
  • Output element can be reliably prevented.
  • the coupling section of the lever element has a planar wall section
  • the housing recess has a planar wall section.
  • the planar wall section of the lever element interacts with the planar wall section of the housing recess such that the at least one lever element is coupled to the housing in a rotationally fixed manner with respect to the force action axis.
  • planar wall section of the lever element and the planar wall section of the housing recess are in particular planar in a plane which is approximately plane-parallel to the force action axis.
  • lever element and the housing can be made in a very simple manner. Furthermore, can a rotational movement of the lever member relative to the housing to be reliably prevented.
  • the coupling portion of the lever element has a recess
  • the housing has a pin.
  • the pin is arranged in the recess of the coupling portion of the lever member such that the at least one lever member is rotatably coupled to the housing with respect to the force action axis.
  • the invention is characterized by an injection valve, which comprises the lever device and a valve needle.
  • the valve needle is coupled to the output element or forms the output element.
  • the drive element and the valve needle are coupled to one another via the lever device in such a way that, depending on a control signal, the valve needle prevents fluid flow through the injection valve in a closed position and otherwise releases it. Due to the coupling of the lever member relative to the housing or the valve needle, such a valve can be operated permanently reliable.
  • FIG. 1 shows a schematic representation of an injection valve
  • FIG. 2 shows a cross section through a lever device in a first embodiment
  • 3 shows a cross section through a lever device in a further embodiment
  • Figure 4 shows a cross section through a lever device in a further embodiment
  • Figure 5 shows a further cross section through the lever device of
  • FIG. 1 shows a valve, in particular an injection valve 10 for an internal combustion engine in a motor vehicle.
  • the injection valve 10 has a housing 12.
  • the housing 12 has an intermediate disc 12a, which is arranged between two tubular sections 12b of the housing 12.
  • the washer 12a and the two tubular portions 12b are fixedly coupled together and together form the housing 12.
  • a housing recess 14 with a fluid inlet 16 and a fluid outlet 18 is formed in the housing 12.
  • fuel can be supplied to the injection valve 10 in the region of the fluid inlet 16.
  • a valve needle 20 is arranged axially movable, which closes an injection nozzle 22 in a closed position and otherwise allows fuel flow through the injection nozzle 22.
  • the injection valve 10 includes a piezoelectric actuator 24.
  • the piezoelectric actuator 24 may also be be provided other actuator, such as a magnetostrictive actuator or an electromagnetic actuator.
  • the injector 10 further includes a drive element 26 coupled to the actuator 24.
  • the drive element 26 preferably includes a pin or rod that transmits the stroke and a drive force of the actuator 24.
  • the actuator 24 and the drive element 26 are coupled together in the axial direction.
  • a stroke of the drive element 26 is dependent on an axial extent of the piezoelectric actuator 24, which depends on a
  • Control signal is that can be supplied to the piezoelectric actuator 24.
  • the drive element 26 further comprises a preferably bell-shaped component 27.
  • a lever device 28 is further arranged.
  • the lever device 28 comprises the drive element 26 and a lever element 30 or a plurality of lever elements 30.
  • the lever device 28 has two lever elements 30.
  • the lever elements 30 are coupled to the drive element 26.
  • the lever elements 30 are coupled to an output element 32.
  • the output element 32 is arranged in the housing recess 14.
  • the output element 32 is preferably coupled to the valve needle 20.
  • the valve needle 20 may also form the output element 32.
  • the drive member 26, the lever member 30 and the output member 32 cooperate such that the stroke of the drive member 26 is transmitted to the valve needle 20 and that the valve needle 20 is thus moved to its closed position or to an open position.
  • a force action axis A of a drive force of the drive member 26 passes through the drive member 26 and as a force action axis of a driven force further through the Output element 32.
  • the force action axis is offset by the drive element 26 to the force action axis by the output element 32.
  • Figure 2 shows a first embodiment of the lever device 28 in a cross section.
  • the lever elements 30 each have a coupling portion 34.
  • Figure 2 has the
  • Output element 32 has two planar wall sections 36.
  • the planar wall sections 36 are opposite to each other with respect to the force action axis A of the output element 32.
  • the coupling sections 34 of the lever elements 30 each have a planar wall section 38.
  • the planar wall sections 38 of the lever elements 30 are assigned to the planar wall sections 36 of the output element 32.
  • one of the planar wall sections 38 of the lever element 30 is opposite to a planar wall section 36 of the output element 32.
  • the planar wall portions 36 of the output member 32 cooperate with the planar wall portions 38 of the lever member 30, and thus allow the lever members 30 with the
  • Output element 32 rotatably with respect to the force axis A are coupled. It can thus be achieved that the lever elements 30 can no longer rotate with respect to the valve needle 20. Thus, the conditions in the injection of the injection valve 10 can be kept constant over many injection events.
  • the coupling sections 34 of the lever elements 30 have planar wall sections 38.
  • the housing recess 14 of the housing 12 has two planar wall sections 40 facing one another with respect to the force action axis A.
  • one of the planar wall sections 38 of one of the lever elements 30 acts with one of plan wall portions 40 of the housing recess 14 together. It can thereby be achieved that the lever element 30 is coupled to the housing 12 in a rotationally fixed manner with respect to the force action axis A.
  • the rotationally fixed coupling of the lever members 30 to the housing 12 it is possible that the contact conditions between the lever members 30 and the housing 12 can be kept constant over a long period of time.
  • the injection behavior of the injection valve 10 can be kept constant over a long period of time.
  • bores are arranged in the intermediate disk 12a of the housing 12.
  • the holes are formed in particular as blind holes.
  • pins 42 are arranged in the holes.
  • the coupling sections 34 of the lever elements 30 each have a recess 44.
  • the pins 42 engage in the recesses 44 of the coupling sections 34 of the lever elements 30. It can thus be achieved that the lever elements 30 are rotationally fixedly coupled to the intermediate disk 12a of the housing 12 with respect to the force action axis A.
  • lever elements 30 Due to the non-rotatable coupling between the lever members 30 and the housing 12 can be achieved that the lever elements 30 also a plurality of injection processes a fixed

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a lever device (28) for a fuel injection valve, comprising a housing (12) with a housing recess (14), at least one lever element (30) arranged in said housing recess (14), a drive element (26) arranged in the housing recess (14) and coupled to the at least one lever element (30) in order to act upon said at least one lever element in the direction of a force-action axis (A), and an output element (32) arranged in the housing recess (14) and coupled to said at least one lever element (30) such that this output element (32) may be moved in the force-action axis (A) direction by means of the at least one lever element (30). This at least one lever element (30) comprises a coupling section (34) that is designed or arranged in such a manner that said at least one lever element (30) is coupled to the housing (12), or to the output element (32), in a rotationally-fixed manner with respect to the force-action axis (A).

Description

Beschreibung description

Hebelvorrichtung und Einspritzventil Lever and injector

Die Erfindung betrifft eine Hebelvorrichtung für ein Einspritzventil mit einem Gehäuse, mindestens einem Hebelelement, einem Antriebselement und einem Abtriebselement. Die Erfindung betrifft ferner ein Einspritzventil für eine Brennkraftmaschine eines Kraftfahrzeugs, das die Hebelvorrichtung und eine Ventilnadel aufweist, die mit dem Abtriebselement gekoppelt ist oder die das Abtriebselement bildet. The invention relates to a lever device for an injection valve having a housing, at least one lever element, a drive element and an output element. The invention further relates to an injection valve for an internal combustion engine of a motor vehicle, which comprises the lever device and a valve needle which is coupled to the output element or which forms the output element.

Einspritzventile für eine Brennkraftmaschine eines Kraftfahrzeugs können Aktuatoren aufweisen, die insbesondere als Piezoaktuatoren ausgebildet sind. Derartige Aktuatoren weisen ein piezokeramisches Material auf. Derartige Aktuatoren können ihre Längsausdehnung verändern abhängig von einem elektrischen Feld, das in dem piezokeramischen Material wirkt. Des Weiteren kann eine Hebelvorrichtung vorgesehen sein, die den Hub des Aktuators übersetzt. Injection valves for an internal combustion engine of a motor vehicle may have actuators which are designed in particular as piezoactuators. Such actuators have a piezoceramic material. Such actuators may change their longitudinal extent depending on an electric field acting in the piezoceramic material. Furthermore, a lever device can be provided which translates the stroke of the actuator.

Piezoelektrische Aktuatoren, die als Stellglieder genutzt werden, insbesondere in Einspritzventilen für Brennkraftmaschinen in Kraftfahrzeugen, sind so in einem Gehäuse angeordnet, dass eine Hubbewegung in axialer Richtung ausgeführt werden kann. Piezoelectric actuators, which are used as actuators, in particular in injection valves for internal combustion engines in motor vehicles, are arranged in a housing so that a lifting movement in the axial direction can be performed.

Die Aufgabe der Erfindung ist, eine Hebelvorrichtung für ein Einspritzventil zu schaffen, die dauerhaft zuverlässig ist. Die Aufgabe ist ferner, ein Einspritzventil zu schaffen, das eine lange Lebensdauer hat. The object of the invention is to provide a lever device for an injection valve, which is permanently reliable. The object is also to provide an injection valve, which has a long life.

Die Aufgabe wird gelöst durch die Merkmale der unabhängigen Patentansprüche. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet. Gemäß eines ersten Aspekts zeichnet sich die Erfindung aus durch eine Hebelvorrichtung für ein Einspritzventil, mit einem Gehäuse, das eine Gehäuseausnehmung aufweist, mindestens einem Hebelelement, das in der Gehäuseausnehmung angeordnet ist, einem Antriebselement, das in der Gehäuseausnehmung angeordnet ist und mit dem mindestens einen Hebelelement gekoppelt ist zum Einwirken auf das mindestens eine Hebelelement in Richtung einer The object is solved by the features of the independent claims. Advantageous developments of the invention are characterized in the subclaims. According to a first aspect, the invention is characterized by a lever device for an injection valve, with a housing having a housing recess, at least one lever element which is arranged in the housing recess, a drive element which is arranged in the housing recess and with the at least one Lever element is coupled to act on the at least one lever element in the direction of a

Kraftwirkungsachse, und einem in der Gehäuseausnehmung angeordneten Abtriebselement. Das Abtriebselement ist derart mit dem mindestens einen Hebelelement gekoppelt, dass das Force action axis, and arranged in the housing recess output member. The output element is coupled to the at least one lever element such that the

Abtriebselement mittels des mindestens einen Hebelelements in Richtung der Kraftwirkungsachse bewegbar ist. Das mindestens eine Hebelelement weist einen Kopplungsabschnitt auf, der derart ausgebildet oder angeordnet ist, dass das mindestens eine Hebelelement mit dem Gehäuse oder dem Abtriebselement drehfest bezüglich der Kraftwirkungsachse gekoppelt ist. Output element by means of the at least one lever element in the direction of the force action axis is movable. The at least one lever element has a coupling section which is designed or arranged such that the at least one lever element is coupled to the housing or the driven element in a rotationally fixed manner with respect to the force action axis.

Das mindestens eine Hebelelement ist gegenüber dem Gehäuse oder dem Abtriebselement rotatorisch fixiert bezüglich der Kraft- wirkungsachse . The at least one lever element is rotationally fixed with respect to the housing or the driven element with respect to the force axis of action.

Dies hat den Vorteil, dass das mindestens eine Hebelelement gegenüber dem Gehäuse oder dem Abtriebselement an einer Rotationsbewegung gehindert ist, wodurch Veränderungen der Einspritzmengen, die durch eine derartige Rotationsbewegung des mindestens einen Hebelelements entstehen können, vermieden werden können. Das mindestens eine Hebelelement ist so zuverlässig gegenüber dem Gehäuse oder dem Abtriebselement positioniert. Dadurch kann ein dauerhaft zuverlässiger Betrieb der Hebelvorrichtung ermöglicht werden. This has the advantage that the at least one lever element relative to the housing or the driven element is prevented from rotating, whereby changes in the injection quantities, which can be caused by such a rotational movement of the at least one lever element, can be avoided. The at least one lever element is positioned so reliably relative to the housing or the driven element. As a result, a permanently reliable operation of the lever device can be made possible.

In einer vorteilhaften Ausgestaltung weist der Kopplungsabschnitt des Hebelelements einen planen Wandabschnitt auf, und das Abtriebselement weist einen planen Wandabschnitt auf. Der plane Wandabschnitt des Hebelelements wirkt derart mit dem planen Wandabschnitt des Abtriebselements zusammen, dass das mindestens eine Hebelelement mit dem Abtriebselement drehfest bezüglich der Kraftwirkungsachse gekoppelt ist. In an advantageous embodiment, the coupling portion of the lever member on a flat wall portion, and the output element has a flat wall portion. The plane Wall portion of the lever member cooperates with the planar wall portion of the output element such that the at least one lever element is rotatably coupled to the output element with respect to the force action axis.

Der plane Wandabschnitt des Hebelelements und der plane Wandabschnitt des Abtriebselements sind insbesondere plan in einer Ebene, die annähernd planparallel zur Kraftwirkungsachse ist . The planar wall section of the lever element and the planar wall section of the output element are in particular planar in a plane which is approximately plane-parallel to the force action axis.

Dies hat den Vorteil, dass die planen Wandabschnitte des Hebelelements und des Abtriebselements fertigungstechnisch besonders einfach zu realisieren sind. Damit können das Hebelelement und das Abtriebselement in sehr einfacher und zuver- lässiger Weise hergestellt werden. Des Weiteren kann eine Rotationsbewegung des Hebelelements gegenüber dem This has the advantage that the planar wall sections of the lever element and the output element are particularly easy to realize in terms of manufacturing technology. Thus, the lever element and the output element can be produced in a very simple and reliable manner. Furthermore, a rotational movement of the lever element relative to the

Abtriebselement zuverlässig verhindert werden. Output element can be reliably prevented.

In einer weiteren vorteilhaften Ausgestaltung weist der Kopplungsabschnitt des Hebelelements einen planen Wandabschnitt auf, und die Gehäuseausnehmung weist einen planen Wandabschnitt auf. Der plane Wandabschnitt des Hebelelements wirkt derart mit dem planen Wandabschnitt der Gehäuseausnehmung zusammen, dass das mindestens eine Hebelelement mit dem Gehäuse drehfest bezüglich der Kraftwirkungsachse gekoppelt ist. In a further advantageous refinement, the coupling section of the lever element has a planar wall section, and the housing recess has a planar wall section. The planar wall section of the lever element interacts with the planar wall section of the housing recess such that the at least one lever element is coupled to the housing in a rotationally fixed manner with respect to the force action axis.

Der plane Wandabschnitt des Hebelelements und der plane Wandabschnitt der Gehäuseausnehmung sind insbesondere plan in einer Ebene, die annähernd planparallel zur Kraftwirkungsachse ist. The planar wall section of the lever element and the planar wall section of the housing recess are in particular planar in a plane which is approximately plane-parallel to the force action axis.

Dies hat den Vorteil, dass das Hebelelement und das Gehäuse in sehr einfacher Weise gefertigt sein können. Des Weiteren kann eine Rotationsbewegung des Hebelelements gegenüber dem Gehäuse zuverlässig verhindert sein. This has the advantage that the lever element and the housing can be made in a very simple manner. Furthermore, can a rotational movement of the lever member relative to the housing to be reliably prevented.

In einer weiteren vorteilhaften Ausgestaltung weist der Kopplungsabschnitt des Hebelelements eine Ausnehmung auf, und das Gehäuse weist einen Stift auf. Der Stift ist derart in der Ausnehmung des Kopplungsabschnitts des Hebelelements angeordnet, dass das mindestens eine Hebelelement mit dem Gehäuse drehfest bezüglich der Kraftwirkungsachse gekoppelt ist. Dies hat den Vorteil, dass so eine Rotationsbewegung des Hebelelements gegenüber dem Gehäuse besonders zuverlässig verhindert werden kann . In a further advantageous embodiment, the coupling portion of the lever element has a recess, and the housing has a pin. The pin is arranged in the recess of the coupling portion of the lever member such that the at least one lever member is rotatably coupled to the housing with respect to the force action axis. This has the advantage that such a rotational movement of the lever member relative to the housing can be particularly reliably prevented.

Gemäß eines zweiten Aspekts zeichnet sich die Erfindung aus durch ein Einspritzventil, das die Hebelvorrichtung und eine Ventilnadel umfasst. Die Ventilnadel ist mit dem Abtriebselement gekoppelt oder bildet das Abtriebselement. Das Antriebselement und die Ventilnadel sind derart über die Hebelvorrichtung miteinander gekoppelt, dass abhängig von einem Stellsignal die Ventilnadel in einer Schließposition einen Fluidfluss durch das Einspritzventil verhindert und diesen ansonsten freigibt. Aufgrund der Kopplung des Hebelelements gegenüber dem Gehäuse beziehungsweise der Ventilnadel kann ein solches Ventil dauerhaft zuverlässig betrieben werden. According to a second aspect, the invention is characterized by an injection valve, which comprises the lever device and a valve needle. The valve needle is coupled to the output element or forms the output element. The drive element and the valve needle are coupled to one another via the lever device in such a way that, depending on a control signal, the valve needle prevents fluid flow through the injection valve in a closed position and otherwise releases it. Due to the coupling of the lever member relative to the housing or the valve needle, such a valve can be operated permanently reliable.

Ausführungsbeispiele der Erfindung sind im Folgenden anhand der schematischen Zeichnungen erläutert. Es zeigen: Embodiments of the invention are explained below with reference to the schematic drawings. Show it:

Figur 1 eine schematische Darstellung eines Einspritzventils, FIG. 1 shows a schematic representation of an injection valve,

Figur 2 einen Querschnitt durch eine Hebelvorrichtung in einer ersten Ausführungsform, Figur 3 einen Querschnitt durch eine Hebelvorrichtung in einer weiteren Ausführungsform, FIG. 2 shows a cross section through a lever device in a first embodiment, 3 shows a cross section through a lever device in a further embodiment,

Figur 4 einen Querschnitt durch eine Hebelvorrichtung in einer weiteren Ausführungsform, und Figure 4 shows a cross section through a lever device in a further embodiment, and

Figur 5 einen weiteren Querschnitt durch die Hebelvorrichtung der Figure 5 shows a further cross section through the lever device of

Ausführungsform der Figur 4. Elemente gleicher Konstruktion oder Funktion sind figurenübergreifend mit den gleichen Bezugszeichen versehen.  Embodiment of Figure 4. Elements of the same construction or function are provided across the figures with the same reference numerals.

Figur 1 zeigt ein Ventil, insbesondere ein Einspritzventil 10 für eine Brennkraftmaschine in einem Kraftfahrzeug. FIG. 1 shows a valve, in particular an injection valve 10 for an internal combustion engine in a motor vehicle.

Das Einspritzventil 10 hat ein Gehäuse 12. Das Gehäuse 12 hat eine Zwischenscheibe 12a, die zwischen zwei rohrförmigen Abschnitten 12b des Gehäuses 12 angeordnet ist. Die Zwischenscheibe 12a und die beiden rohrförmigen Abschnitte 12b sind fest miteinander gekoppelt und bilden zusammen das Gehäuse 12 aus. In dem Gehäuse 12 ist eine Gehäuseausnehmung 14 mit einem Fluideintritt 16 und einem Fluidaustritt 18 ausgebildet. Über einen nicht dargestellten Anschluss, der mit der Gehäuseausnehmung 14 hydraulisch gekoppelt ist, kann dem Einspritzventil 10 im Bereich des Fluideintritts 16 Kraftstoff zugeführt werden. The injection valve 10 has a housing 12. The housing 12 has an intermediate disc 12a, which is arranged between two tubular sections 12b of the housing 12. The washer 12a and the two tubular portions 12b are fixedly coupled together and together form the housing 12. In the housing 12, a housing recess 14 with a fluid inlet 16 and a fluid outlet 18 is formed. Via a connection, not shown, which is hydraulically coupled to the housing recess 14, fuel can be supplied to the injection valve 10 in the region of the fluid inlet 16.

In der Gehäuseausnehmung 14 ist axial bewegbar eine Ventilnadel 20 angeordnet, die in einer Schließposition eine Einspritzdüse 22 verschließt und anderenfalls einen Kraftstofffluss durch die Einspritzdüse 22 ermöglicht. In the housing recess 14, a valve needle 20 is arranged axially movable, which closes an injection nozzle 22 in a closed position and otherwise allows fuel flow through the injection nozzle 22.

Das Einspritzventil 10 umfasst einen piezoelektrischen Aktuator 24. Anstelle des piezoelektrischen Aktuators 24 kann auch ein anderer Aktuator vorgesehen sein, z.B. ein magnetostriktiver Aktuator oder ein elektromagnetischer Aktuator. The injection valve 10 includes a piezoelectric actuator 24. Instead of the piezoelectric actuator 24 may also be be provided other actuator, such as a magnetostrictive actuator or an electromagnetic actuator.

Das Einspritzventil 10 umfasst weiter ein mit dem Aktuator 24 gekoppeltes Antriebselement 26. Das Antriebselement 26 weist vorzugsweise einen Stift oder eine Stange auf, der beziehungsweise die den Hub und eine Antriebskraft des Aktuators 24 überträgt. Der Aktuator 24 und das Antriebselement 26 sind in axialer Richtung miteinander gekoppelt. Ein Hub des An- triebselements 26 ist abhängig von einer axialen Ausdehnung des piezoelektrischen Aktuators 24, die abhängig von einem The injector 10 further includes a drive element 26 coupled to the actuator 24. The drive element 26 preferably includes a pin or rod that transmits the stroke and a drive force of the actuator 24. The actuator 24 and the drive element 26 are coupled together in the axial direction. A stroke of the drive element 26 is dependent on an axial extent of the piezoelectric actuator 24, which depends on a

Stellsignal ist, das dem piezoelektrischen Aktuator 24 zugeführt werden kann. Das Antriebselement 26 umfasst ferner ein vorzugsweise glockenförmiges Bauelement 27. Control signal is that can be supplied to the piezoelectric actuator 24. The drive element 26 further comprises a preferably bell-shaped component 27.

In der Gehäuseausnehmung 14 des Einspritzventils 10 ist ferner eine Hebelvorrichtung 28 angeordnet. Die Hebelvorrichtung 28 umfasst das Antriebselement 26 und ein Hebelelement 30 oder mehrere Hebelelemente 30. In den gezeigten Ausführungsformen hat die Hebelvorrichtung 28 zwei Hebelelemente 30. Die Hebelelemente 30 sind mit dem Antriebselement 26 gekoppelt. Ferner sind die Hebelelemente 30 mit einem Abtriebselement 32 gekoppelt. Das Abtriebselement 32 ist in der Gehäuseausnehmung 14 angeordnet. Das Abtriebselement 32 ist vorzugsweise mit der Ventilnadel 20 gekoppelt. Die Ventilnadel 20 kann auch das Abtriebselement 32 bilden. Das Antriebselement 26, das Hebelelement 30 und das Abtriebselement 32 wirken derart zusammen, dass der Hub des Antriebselements 26 auf die Ventilnadel 20 übertragen wird und dass die Ventilnadel 20 damit in ihre Schließposition oder in eine Offenposition bewegt wird. In the housing recess 14 of the injection valve 10, a lever device 28 is further arranged. The lever device 28 comprises the drive element 26 and a lever element 30 or a plurality of lever elements 30. In the embodiments shown, the lever device 28 has two lever elements 30. The lever elements 30 are coupled to the drive element 26. Furthermore, the lever elements 30 are coupled to an output element 32. The output element 32 is arranged in the housing recess 14. The output element 32 is preferably coupled to the valve needle 20. The valve needle 20 may also form the output element 32. The drive member 26, the lever member 30 and the output member 32 cooperate such that the stroke of the drive member 26 is transmitted to the valve needle 20 and that the valve needle 20 is thus moved to its closed position or to an open position.

Eine Kraftwirkungsachse A einer Antriebskraft des Antriebselements 26 verläuft durch das Antriebselement 26 und als Kraftwirkungsachse einer Abtriebskraft weiter durch das Abtriebselement 32. In weiteren Ausführungsformen ist die Kraftwirkungsachse durch das Antriebselement 26 versetzt zu der Kraftwirkungsachse durch das Abtriebselement 32. Figur 2 zeigt eine erste Ausführungsform der Hebelvorrichtung 28 in einem Querschnitt. A force action axis A of a drive force of the drive member 26 passes through the drive member 26 and as a force action axis of a driven force further through the Output element 32. In further embodiments, the force action axis is offset by the drive element 26 to the force action axis by the output element 32. Figure 2 shows a first embodiment of the lever device 28 in a cross section.

Die Hebelelemente 30 haben jeweils einen Kopplungsabschnitt 34. In der in Figur 2 gezeigten Ausführungsform hat das The lever elements 30 each have a coupling portion 34. In the embodiment shown in Figure 2 has the

Abtriebselement 32 zwei plane Wandabschnitte 36. Die planen Wandabschnitte 36 liegen einander bezüglich der Kraftwirkungsachse A des Abtriebselements 32 gegenüber. Des Weiteren haben die Kopplungsabschnitte 34 der Hebelelemente 30 jeweils einen planen Wandabschnitt 38. Die planen Wandabschnitte 38 der Hebelelemente 30 sind den planen Wandabschnitten 36 des Abtriebselements 32 zugeordnet. Jeweils einer der planen Wandabschnitte 38 des Hebelelements 30 liegt einem planen Wandabschnitt 36 des Abtriebselements 32 gegenüber. Damit wirken die planen Wandabschnitte 36 des Abtriebselements 32 mit den planen Wandabschnitten 38 des Hebelelements 30 zusammen, und ermöglichen somit, dass die Hebelelemente 30 mit dem Output element 32 has two planar wall sections 36. The planar wall sections 36 are opposite to each other with respect to the force action axis A of the output element 32. Furthermore, the coupling sections 34 of the lever elements 30 each have a planar wall section 38. The planar wall sections 38 of the lever elements 30 are assigned to the planar wall sections 36 of the output element 32. In each case one of the planar wall sections 38 of the lever element 30 is opposite to a planar wall section 36 of the output element 32. Thus, the planar wall portions 36 of the output member 32 cooperate with the planar wall portions 38 of the lever member 30, and thus allow the lever members 30 with the

Abtriebselement 32 drehfest bezüglich der Kraftwirkungsachse A gekoppelt sind. Damit kann erreicht werden, dass sich die Hebelelemente 30 nicht mehr gegenüber der Ventilnadel 20 drehen können. Damit können auch die Verhältnisse bei der Einspritzung des Einspritzventils 10 über viele Einspritzvorgänge konstant gehalten werden. Output element 32 rotatably with respect to the force axis A are coupled. It can thus be achieved that the lever elements 30 can no longer rotate with respect to the valve needle 20. Thus, the conditions in the injection of the injection valve 10 can be kept constant over many injection events.

In der in Figur 3 gezeigten Ausführungsform der Hebelvorrichtung 28 haben die Kopplungsabschnitte 34 der Hebelelemente 30 plane Wandabschnitte 38. Die Gehäuseausnehmung 14 des Gehäuses 12 hat zwei plane Wandabschnitte 40, die einander bezüglich der Kraftwirkungsachse A gegenüberliegen. Jeweils einer der planen Wandabschnitte 38 eines der Hebelelemente 30 wirkt mit einem der planen Wandabschnitte 40 der Gehäuseausnehmung 14 zusammen. Dadurch kann erreicht werden, dass das Hebelelement 30 mit dem Gehäuse 12 drehfest bezüglich der Kraftwirkungsachse A gekoppelt ist. Durch die drehfeste Kopplung der Hebelelemente 30 mit dem Gehäuse 12 ist es möglich, dass die Kontaktbedingungen zwischen den Hebelelementen 30 und dem Gehäuse 12 über einen langen Zeitraum konstant gehalten werden können. Damit kann auch das Einspritzverhalten des Einspritzventils 10 über einen langen Zeitraum konstant gehalten werden. In the embodiment of the lever device 28 shown in FIG. 3, the coupling sections 34 of the lever elements 30 have planar wall sections 38. The housing recess 14 of the housing 12 has two planar wall sections 40 facing one another with respect to the force action axis A. In each case one of the planar wall sections 38 of one of the lever elements 30 acts with one of plan wall portions 40 of the housing recess 14 together. It can thereby be achieved that the lever element 30 is coupled to the housing 12 in a rotationally fixed manner with respect to the force action axis A. By the rotationally fixed coupling of the lever members 30 to the housing 12, it is possible that the contact conditions between the lever members 30 and the housing 12 can be kept constant over a long period of time. Thus, the injection behavior of the injection valve 10 can be kept constant over a long period of time.

In der in den Figuren 4 und 5 gezeigten Ausführungsform sind in der Zwischenscheibe 12a des Gehäuses 12 Bohrungen angeordnet. Die Bohrungen sind insbesondere als Sacklöcher ausgebildet. In den Bohrungen sind Stifte 42 angeordnet. In the embodiment shown in FIGS. 4 and 5, bores are arranged in the intermediate disk 12a of the housing 12. The holes are formed in particular as blind holes. In the holes pins 42 are arranged.

Die Kopplungsabschnitte 34 der Hebelelemente 30 haben jeweils eine Ausnehmung 44. Die Stifte 42 greifen in die Ausnehmungen 44 der Kopplungsabschnitte 34 der Hebelelemente 30 ein. Damit kann erreicht werden, dass die Hebelelemente 30 drehfest mit der Zwischenscheibe 12a des Gehäuses 12 bezüglich der Kraftwirkungsachse A gekoppelt sind. The coupling sections 34 of the lever elements 30 each have a recess 44. The pins 42 engage in the recesses 44 of the coupling sections 34 of the lever elements 30. It can thus be achieved that the lever elements 30 are rotationally fixedly coupled to the intermediate disk 12a of the housing 12 with respect to the force action axis A.

Durch die drehfeste Kopplung zwischen den Hebelelementen 30 und dem Gehäuse 12 kann erreicht werden, dass die Hebelelemente 30 auch über eine Vielzahl von Einspritzvorgängen eine festeDue to the non-rotatable coupling between the lever members 30 and the housing 12 can be achieved that the lever elements 30 also a plurality of injection processes a fixed

Position gegenüber dem Gehäuse 12 einnehmen können. Dadurch können auch über eine Vielzahl von Einspritzvorgängen des Einspritzventils 10 stabile Einspritzverhältnisse des Einspritzventils 10 erreicht werden. Dadurch kann erreicht werden, dass sich Bauteiltoleranzen nur geringfügig auf die Einspritzmengen des Einspritzventils 10 auswirken. Position opposite the housing 12 can take. As a result, 10 stable injection conditions of the injection valve 10 can be achieved via a variety of injection processes of the injection valve 10. It can thereby be achieved that component tolerances have only a slight effect on the injection quantities of the injection valve 10.

Claims

Patentansprüche claims 1. Hebelvorrichtung (28) für ein Einspritzventil, mit 1. lever device (28) for an injection valve, with - einem Gehäuse (12), das eine Gehäuseausnehmung (14) aufweist, - mindestens einem Hebelelement (30), das in der  a housing (12) having a housing recess (14), - at least one lever element (30), which in the Gehäuseausnehmung (14) angeordnet ist,  Housing recess (14) is arranged, - einem Antriebselement (26), das in der Gehäuseausnehmung (14) angeordnet ist und mit dem mindestens einen Hebelelement (30) gekoppelt ist zum Einwirken auf das mindestens eine Hebelelement in Richtung einer Kraftwirkungsachse (A) , und  a drive element (26) which is arranged in the housing recess (14) and is coupled to the at least one lever element (30) for acting on the at least one lever element in the direction of a force action axis (A), and - einem in der Gehäuseausnehmung (14) angeordneten  - One arranged in the housing recess (14) Abtriebselement (32), das derart mit dem mindestens einen Hebelelement (30) gekoppelt ist, dass das Abtriebselement (32) mittels des mindestens einen Hebelelements (30) in Richtung der Kraftwirkungsachse (A) bewegbar ist, Output element (32) which is coupled to the at least one lever element (30) such that the output element (32) is movable by means of the at least one lever element (30) in the direction of the force action axis (A), wobei das mindestens eine Hebelelement (30) einen Kopplungsabschnitt (34) aufweist, der derart ausgebildet oder angeordnet ist, dass das mindestens eine Hebelelement (30) mit dem Gehäuse (12) oder dem Abtriebselement (32) drehfest bezüglich der Kraftwirkungsachse (A) gekoppelt ist. wherein the at least one lever element (30) has a coupling section (34) which is designed or arranged such that the at least one lever element (30) is coupled to the housing (12) or the output element (32) in a rotationally fixed manner with respect to the force action axis (A) is. 2. Hebelvorrichtung (28) nach Anspruch 1, wobei der Kopplungsabschnitt (34) des Hebelelements (30) einen planen Wandabschnitt (38) aufweist, und das Abtriebselement (32) einen planen Wandabschnitt (36) aufweist, und der plane Wandabschnitt (38) des Hebelelements (30) derart mit dem planen Wandabschnitt (36) des Abtriebselements (32) zusammenwirkt, dass das mindestens eine Hebelelement (30) mit dem Abtriebselement (32) drehfest bezüglich der Kraftwirkungsachse (A) gekoppelt ist. Second lever device (28) according to claim 1, wherein the coupling portion (34) of the lever member (30) has a flat wall portion (38), and the output member (32) has a planar wall portion (36), and the planar wall portion (38). the lever element (30) cooperates with the planar wall section (36) of the driven element (32) such that the at least one lever element (30) is coupled to the output element (32) in a rotationally fixed manner relative to the force action axis (A). 3. Hebelvorrichtung (28) nach Anspruch 1 oder 2, wobei der Kopplungsabschnitt (34) des Hebelelements (30) einen planen Wandabschnitt (38) aufweist, und die Gehäuseausnehmung (14) einen planen Wandabschnitt (40) aufweist, und der plane Wandabschnitt (38) des Hebelelements (30) derart mit dem planen Wandabschnitt (40) der Gehäuseausnehmung (14) zusammenwirkt, dass das mindestens eine Hebelelement (30) mit dem Gehäuse (12) drehfest bezüglich der Kraftwirkungsachse (A) gekoppelt ist. 3. lever device (28) according to claim 1 or 2, wherein the coupling portion (34) of the lever member (30) has a planar wall portion (38), and the housing recess (14) has a planar wall portion (40), and the plane Wall section (38) of the lever member (30) in such a way with the planar wall portion (40) of the housing recess (14) cooperates, that the at least one lever element (30) with the housing (12) rotationally fixed with respect to the force axis of action (A) is coupled. 4. Hebelvorrichtung (28) nach einem der vorstehenden Ansprüche, wobei der Kopplungsabschnitt (34) des Hebelelements (30) eine Ausnehmung (44) aufweist, und das Gehäuse (12) einen Stift (42) aufweist, und der Stift (42) derart in der Ausnehmung (44) des Kopplungsabschnitts (34) des Hebelelements (30) angeordnet ist, dass das mindestens eine Hebelelement (30) mit dem Gehäuse (12) drehfest bezüglich der Kraftwirkungsachse (A) gekoppelt ist. 4. lever device (28) according to any one of the preceding claims, wherein the coupling portion (34) of the lever member (30) has a recess (44), and the housing (12) has a pin (42), and the pin (42) such in the recess (44) of the coupling portion (34) of the lever member (30) is arranged, that the at least one lever element (30) with the housing (12) rotatably coupled with respect to the force axis of action (A). 5. Einspritzventil (10), das aufweist 5. injection valve (10) having - ein Hebelvorrichtung (28) nach einem der vorstehenden Ansprüche, - A lever device (28) according to any one of the preceding claims, - eine Ventilnadel (20), die mit dem Abtriebselement (32) gekoppelt ist oder die das Abtriebselement (32) bildet, bei dem das Antriebselement (26) und die Ventilnadel (20) derart über die Hebelvorrichtung (28) miteinander gekoppelt sind, dass abhängig von einem Stellsignal die Ventilnadel (20) in einer Schließposition einen Fluidfluss durch das Einspritzventil (10) verhindert und ansonsten einen Fluidfluss durch das Einspritzventil (10) freigibt.  - A valve needle (20) which is coupled to the output member (32) or which forms the output member (32), wherein the drive element (26) and the valve needle (20) are coupled together via the lever device (28), that Depending on a control signal, the valve needle (20) in a closed position prevents fluid flow through the injection valve (10) and otherwise releases fluid flow through the injection valve (10).
EP12813825.2A 2011-12-30 2012-12-19 Lever device and a fuel injection valve Active EP2798195B1 (en)

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DE102011090196A DE102011090196A1 (en) 2011-12-30 2011-12-30 Lever and injector
PCT/EP2012/076183 WO2013098161A1 (en) 2011-12-30 2012-12-19 Lever device and a fuel injection valve

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US20150028135A1 (en) 2015-01-29
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DE102011090196A1 (en) 2013-07-04
US9500169B2 (en) 2016-11-22

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