EP2771564B1 - Lever device and a fuel injection valve - Google Patents

Lever device and a fuel injection valve Download PDF

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Publication number
EP2771564B1
EP2771564B1 EP12816266.6A EP12816266A EP2771564B1 EP 2771564 B1 EP2771564 B1 EP 2771564B1 EP 12816266 A EP12816266 A EP 12816266A EP 2771564 B1 EP2771564 B1 EP 2771564B1
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EP
European Patent Office
Prior art keywords
lever
housing
injection valve
coupled
coupling portion
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.)
Active
Application number
EP12816266.6A
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German (de)
French (fr)
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EP2771564A1 (en
Inventor
Stefan Lehmann
Hellmut Freudenberg
Stefan Kohn
Robert Kuchler
Manuel Hannich
Roland Feigl
Wolfgang Wechler
Matthias Wicke
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Continental Automotive GmbH
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Continental Automotive GmbH
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Publication date
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Publication of EP2771564A1 publication Critical patent/EP2771564A1/en
Application granted granted Critical
Publication of EP2771564B1 publication Critical patent/EP2771564B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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, comprising 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. 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 they can perform a lifting movement in the axial direction. The actuator may in particular be coupled to a lever device by means of which the stroke of the actuator can be translated.
  • the international publication WO 2007/116007 A1 discloses an injection valve having a lever member in a housing recess of the injection valve, which is able to convert the downward movement of an actuator of the injection valve in an upward movement of a nozzle needle of the injection valve.
  • 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, comprising a housing having a housing recess, at least one lever element which is arranged in the housing recess and has a coupling portion which is coupled to a portion of the housing Drive element which is arranged in the housing recess and is coupled to the at least one lever element for acting on the at least one lever element in the direction of a force action axis, and arranged in the housing recess output element which is coupled to the at least one lever element such that the output element of the at least one lever element is movable in the direction of the force action axis.
  • the coupling portion of the lever member has at least one recess, by means of which at least two contact surfaces of the coupling portion are formed, which are spaced apart and bear against the portion of the housing.
  • lever element in a region between the contact surfaces of the coupling portion can achieve a low rigidity. It can thus be achieved that mechanical irregularities on the at least one lever element and / or on the portion of the housing only slightly influence the movement of the lever element and thus changes in the injection quantities can be low or avoided. As a result, a long-term reliable operation of the lever device and thus of the injection valve can be made possible.
  • the at least two contact surfaces of the coupling portion are formed as convex curved surfaces. This has the advantage that the friction and the wear of the lever element can be very small. For example, a rolling rolling of the lever element keep the load on the contact surfaces low relative to the section of the housing. This can be made possible by the at least one lever element permanently reliable operation of the lever device.
  • 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 the valve needle in a closed position prevents fluid flow through the injection valve and otherwise releases it. Due to the distance between the at least two contact surfaces of the coupling portion such a valve can be operated permanently reliable.
  • 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 a plurality of sections 12a, 12b.
  • the housing 12 has, in particular, a disc-shaped section 12 a, which is arranged between two tubular sections 12 b of the housing 12.
  • the disc-shaped portion 12 a and the two tubular portions 12 b 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 is dependent on a control signal which 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 (see also FIGS FIG. 2 ).
  • 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 member 32nd
  • FIG. 2 shows an embodiment of the lever device 28 in a cross section.
  • the lever elements 30 each have a coupling region 134.
  • the output element 32 has two plane wall sections 136.
  • the planar wall sections 136 face one another with respect to the force action axis A of the output element 32.
  • the coupling regions 134 of the lever elements 30 each have a planar wall section 138.
  • the planar wall sections 138 of the lever elements 30 are assigned to the planar wall sections 136 of the output element 32. In each case one of the planar wall sections 138 of the lever element 30 is opposite to a planar wall section 136 of the output element 32.
  • planar wall portions 136 of the output member 32 cooperate with the planar wall portions 138 of the lever member 30, and thus allow the lever members 30 are rotatably coupled to the output member 32 with respect to the force axis A of action. 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 portions 134 of the lever members 30 have planar wall portions 138.
  • the housing recess 14 of the housing 12 has two planar wall portions 140, which face each other with respect to the force axis A of action.
  • one of the planar wall sections 138 of one of the lever elements 30 acts with one of plan wall portions 140 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.
  • FIGS. 3 to 6 show an embodiment of the lever member 30 in different views.
  • the lever member 30 has a coupling portion 34.
  • the coupling portion 34 is coupled to the disk-shaped portion 12a of the housing 12 (see also Figs FIG. 1 ).
  • the coupling portion 34 has a recess 36.
  • the recess 36 is formed such that on the coupling portion 34, two contact surfaces 38 are formed, which are spaced apart.
  • the two contact surfaces 38 of the coupling portion 34 abut against a contact surface 40 of the disk-shaped portion 12 a of the housing 12.
  • the contact surface 40 of the disk-shaped portion 12a of the housing 12 has a surface normal which is parallel to the force action axis A.
  • the two contact surfaces 38 of the coupling portion 34 are formed as convex curved surfaces. It can thus be achieved that the lever element 30 can roll over the disk-shaped section 12a of the housing 12 in a rolling manner.
  • the disc-shaped portion 12a of the housing 12 has a raised portion 44 which lies between the contact surfaces 38 of the coupling portion 34 in the region of the recess 36 of the coupling portion 34. Due to the design of the recess 36 of the coupling portion 34, the lever member 30 may be supported without interference by the survey 44 relative to the disc-shaped portion 12 a of the housing 12. A movement of the lever member 30 relative to the disk-shaped portion 12a of the housing 12 via the contact surfaces 38 of the coupling portion 34 and the contact surface 40 can be done so undisturbed by the survey 44.
  • the disk-shaped portion 12 a of the housing 12 has a further elevation 44 a, which lies in the region of one of the contact surfaces 38 of the coupling portion 34. Due to the formation of the recess 36 of the coupling portion 34, the lever member 30 in the region of the recess 36 has a low rigidity. It can thereby be achieved that upon movement of the lever element 30 relative to the disk-shaped section 12a of the housing 12, the lever element 30 can yield in the region of the recess 36. It can thereby be achieved that the further elevation 44a has only a slight influence on the movement of the lever element 30 and thus the movement of the output element 32.
  • the lever element 30 has further coupling sections 42a, 42b ( FIG. 9 ).
  • One of the further coupling sections 42a is coupled to the output element 32.
  • Another of the further coupling sections 42b is coupled to the bell-shaped component 27 of the drive element 26 (see FIG FIG. 1 ).
  • the further coupling section 42a which is coupled to the output element 32, is arranged opposite the further coupling section 42b, which is coupled to the drive element 26, such that the greatest possible distance to the lever element 30 is achieved between the further coupling sections 42a, 42b becomes.
  • the lever element 30 may have a lower rigidity in the area between the further coupling sections 42a, 42b than in the region of the further coupling sections 42a, 42b. It can thus be achieved that upon movement of the lever element 30 relative to the drive element 26 or the output element 32, the lever element 30 can yield in the region between the further coupling sections 42a, 42b. It can thus be achieved that mechanical irregularities on the drive element 26 or the output element 32 have only a small influence on the movement of the lever element 30 and, as a consequence, on the movement of the output element 32.
  • lever elements 30 with the recess 36 of the coupling portion 34 can be achieved that the lever elements 30 can interact via a plurality of injection operations with the disc-shaped portion 12 a of the housing 12 without the transfer behavior between the lever members 30 and the disk-shaped Section 12a of the housing 12 changed significantly.
  • 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, in particular of the lever element 30 and / or the disk-shaped portion 12a of the housing 12, such as by the elevations 44, 44a only to a small extent or not at all affect the injection quantities of the injection valve 10.

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

Description

Die 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, comprising 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. Piezoelektrische Aktuatoren, die als Stellglieder genutzt werden, insbesondere in Einspritzventilen für Brennkraftmaschinen in Kraftfahrzeugen, sind so in einem Gehäuse angeordnet, dass sie eine Hubbewegung in axialer Richtung ausführen können. Der Aktuator kann insbesondere mit einer Hebelvorrichtung gekoppelt sein, mittels der der Hub des Aktuators übersetzt werden kann.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. 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 they can perform a lifting movement in the axial direction. The actuator may in particular be coupled to a lever device by means of which the stroke of the actuator can be translated.

Die internationle Offenlegungsschrift WO 2007/116007 A1 offenbart ein Einspritzventil mit einem Hebelelement in einer Gehäuseausnehmung des Einspritzventils, das die Abwärtsbewegung eines Aktors des Einspritzventils in eine Aufwärtsbewegung einer Düsennadel des Einspritzventil zu wandeln vermag.The international publication WO 2007/116007 A1 discloses an injection valve having a lever member in a housing recess of the injection valve, which is able to convert the downward movement of an actuator of the injection valve in an upward movement of a nozzle needle of the injection valve.

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 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.The object is solved by the features of the independent claims. Advantageous developments of the invention are characterized in the subclaims.

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 und einen Kopplungsabschnitt aufweist, der mit einem Abschnitt des Gehäuses gekoppelt 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 Kraftwirkungsachse, und einem in der Gehäuseausnehmung angeordneten Abtriebselement, das derart mit dem mindestens einen Hebelelement gekoppelt ist, dass das Abtriebselement mittels des mindestens einen Hebelelements in Richtung der Kraftwirkungsachse bewegbar ist. Der Kopplungsabschnitt des Hebelelements weist mindestens eine Ausnehmung auf, mittels der mindestens zwei Kontaktflächen des Kopplungsabschnitts ausgebildet sind, die voneinander beabstandet sind und an dem Abschnitt des Gehäuses anliegen.According to a first aspect, the invention is characterized by a lever device for an injection valve, comprising a housing having a housing recess, at least one lever element which is arranged in the housing recess and has a coupling portion which is coupled to a portion of the housing Drive element which is arranged in the housing recess and is coupled to the at least one lever element for acting on the at least one lever element in the direction of a force action axis, and arranged in the housing recess output element which is coupled to the at least one lever element such that the output element of the at least one lever element is movable in the direction of the force action axis. The coupling portion of the lever member has at least one recess, by means of which at least two contact surfaces of the coupling portion are formed, which are spaced apart and bear against the portion of the housing.

Dies hat den Vorteil, dass das Hebelelement in einem Bereich zwischen den Kontaktflächen des Kopplungsabschnitts eine geringe Steifigkeit erreichen kann. Damit kann erreicht werden, dass mechanische Unregelmäßigkeiten an dem mindestens einen Hebelelement und/oder an dem Abschnitt des Gehäuses die Bewegung des Hebelelements nur gering beeinflussen und damit Veränderungen der Einspritzmengen gering sein oder vermieden werden können. Dadurch kann ein langfristig zuverlässiger Betrieb der Hebelvorrichtung und damit des Einspritzventils ermöglicht werden.This has the advantage that the lever element in a region between the contact surfaces of the coupling portion can achieve a low rigidity. It can thus be achieved that mechanical irregularities on the at least one lever element and / or on the portion of the housing only slightly influence the movement of the lever element and thus changes in the injection quantities can be low or avoided. As a result, a long-term reliable operation of the lever device and thus of the injection valve can be made possible.

In einer vorteilhaften Ausgestaltung sind die mindestens zwei Kontaktflächen des Kopplungsabschnitts als konvex gewölbte Flächen ausgebildet. Dies hat den Vorteil, dass die Reibung und der Verschleiß des Hebelelements sehr gering sein können. Beispielsweise kann ein wälzendes Abrollen des Hebelelements gegenüber dem Abschnitt des Gehäuses die Belastung der Kontaktflächen gering halten. Damit kann durch das mindestens eine Hebelelement ein dauerhaft zuverlässiger Betrieb der Hebelvorrichtung ermöglicht werden.In an advantageous embodiment, the at least two contact surfaces of the coupling portion are formed as convex curved surfaces. This has the advantage that the friction and the wear of the lever element can be very small. For example, a rolling rolling of the lever element keep the load on the contact surfaces low relative to the section of the housing. This can be made possible by the at least one lever element permanently reliable operation of the lever device.

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 die Ventilnadel in einer Schließposition einen Fluidfluss durch das Einspritzventil verhindert und diesen ansonsten freigibt. Aufgrund des Abstands zwischen den mindestens zwei Kontaktflächen des Kopplungsabschnitts 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 the valve needle in a closed position prevents fluid flow through the injection valve and otherwise releases it. Due to the distance between the at least two contact surfaces of the coupling portion such a valve can be operated permanently reliable.

Ausführungsbeispiele der Erfindung sind im Folgenden anhand der schematischen Zeichnungen erläutert. Es zeigen:

Figur 1
eine schematische Darstellung eines Einspritzventils,
Figur 2
und 2a Querschnitte durch eine Hebelvorrichtung in verschiedenen Ausführungsformen,
Figur 3
eine Aufsicht auf ein Hebelelement der Hebelvorrichtung,
Figur 4
eine Seitenansicht des Hebelelements,
Figur 5
ein Längsschnitt durch das Hebelelement,
Figur 6
eine weitere Ansicht des Hebelelements,
Figur 7
ein Längsschnitt durch das Hebelelement und einen Abschnitt eines Gehäuses des Einspritzventils,
Figur 8
ein Längsschnitt durch das Hebelelement und den Abschnitt des Gehäuses, und
Figur 9
eine weitere Aufsicht auf das Hebelelement.
Embodiments of the invention are explained below with reference to the schematic drawings. Show it:
FIG. 1
a schematic representation of an injection valve,
FIG. 2
2a shows cross sections through a lever device in various embodiments,
FIG. 3
a plan view of a lever element of the lever device,
FIG. 4
a side view of the lever element,
FIG. 5
a longitudinal section through the lever element,
FIG. 6
another view of the lever element,
FIG. 7
a longitudinal section through the lever element and a portion of a housing of the injection valve,
FIG. 8
a longitudinal section through the lever member and the portion of the housing, and
FIG. 9
another view of the lever element.

Elemente gleicher Konstruktion oder Funktion sind figurenübergreifend mit den gleichen Bezugszeichen versehen.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 mehrere Abschnitte 12a, 12b. Das Gehäuse 12 hat insbesondere einen scheibenförmigen Abschnitt 12a, der zwischen zwei rohrförmigen Abschnitten 12b des Gehäuses 12 angeordnet ist. Der scheibenförmige Abschnitt 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 a plurality of sections 12a, 12b. The housing 12 has, in particular, a disc-shaped section 12 a, which is arranged between two tubular sections 12 b of the housing 12. The disc-shaped portion 12 a and the two tubular portions 12 b 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 Antriebselements 26 ist abhängig von einer axialen Ausdehnung des piezoelektrischen Aktuators 24, die abhängig von einem Stellsignal ist, das dem piezoelektrischen Aktuator 24 zugeführt werden kann. Das Antriebselement 26 umfasst ferner ein vorzugsweise glockenförmiges Bauelement 27.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 is dependent on a control signal which 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 (siehe auch Figur 2). 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 (see also FIGS FIG. 2 ). 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.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 member 32nd

Figur 2 zeigt eine Ausführungsform der Hebelvorrichtung 28 in einem Querschnitt. FIG. 2 shows an embodiment of the lever device 28 in a cross section.

Die Hebelelemente 30 haben jeweils einen Kopplungsbereich 134. In der in Figur 2 gezeigten Ausführungsform hat das Abtriebselement 32 zwei plane Wandabschnitte 136. Die planen Wandabschnitte 136 liegen einander bezüglich der Kraftwirkungsachse A des Abtriebselements 32 gegenüber. Des Weiteren haben die Kopplungsbereiche 134 der Hebelelemente 30 jeweils einen planen Wandabschnitt 138. Die planen Wandabschnitte 138 der Hebelelemente 30 sind den planen Wandabschnitten 136 des Abtriebselements 32 zugeordnet. Jeweils einer der planen Wandabschnitte 138 des Hebelelements 30 liegt einem planen Wandabschnitt 136 des Abtriebselements 32 gegenüber. Damit wirken die planen Wandabschnitte 136 des Abtriebselements 32 mit den planen Wandabschnitten 138 des Hebelelements 30 zusammen, und ermöglichen somit, dass die Hebelelemente 30 mit dem 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.The lever elements 30 each have a coupling region 134. In the in FIG. 2 In the embodiment shown, the output element 32 has two plane wall sections 136. The planar wall sections 136 face one another with respect to the force action axis A of the output element 32. Furthermore, the coupling regions 134 of the lever elements 30 each have a planar wall section 138. The planar wall sections 138 of the lever elements 30 are assigned to the planar wall sections 136 of the output element 32. In each case one of the planar wall sections 138 of the lever element 30 is opposite to a planar wall section 136 of the output element 32. Thus, the planar wall portions 136 of the output member 32 cooperate with the planar wall portions 138 of the lever member 30, and thus allow the lever members 30 are rotatably coupled to the output member 32 with respect to the force axis A of action. 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 2a gezeigten Ausführungsform der Hebelvorrichtung 28 haben die Kopplungsbereiche 134 der Hebelelemente 30 plane Wandabschnitte 138. Die Gehäuseausnehmung 14 des Gehäuses 12 hat zwei plane Wandabschnitte 140, die einander bezüglich der Kraftwirkungsachse A gegenüberliegen. Jeweils einer der planen Wandabschnitte 138 eines der Hebelelemente 30 wirkt mit einem der planen Wandabschnitte 140 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 in FIG. 2a shown embodiment of the lever device 28, the coupling portions 134 of the lever members 30 have planar wall portions 138. The housing recess 14 of the housing 12 has two planar wall portions 140, which face each other with respect to the force axis A of action. In each case one of the planar wall sections 138 of one of the lever elements 30 acts with one of plan wall portions 140 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.

Die Figuren 3 bis 6 zeigen eine Ausführungsform des Hebelelements 30 in verschiedenen Ansichten.The FIGS. 3 to 6 show an embodiment of the lever member 30 in different views.

Das Hebelelement 30 hat einen Kopplungsabschnitt 34. Der Kopplungsabschnitt 34 ist mit dem scheibenförmigen Abschnitt 12a des Gehäuses 12 gekoppelt (siehe auch Figur 1). Der Kopplungsabschnitt 34 hat eine Ausnehmung 36. Die Ausnehmung 36 ist derart ausgebildet, dass an dem Kopplungsabschnitt 34 zwei Kontaktflächen 38 ausgebildet sind, die voneinander beabstandet sind. Die zwei Kontaktflächen 38 des Kopplungsabschnitts 34 liegen an einer Kontaktfläche 40 des scheibenförmigen Abschnitts 12a des Gehäuses 12 an. Die Kontaktfläche 40 des scheibenförmigen Abschnitts 12a des Gehäuses 12 hat eine Flächennormale, die parallel zu der Kraftwirkungsachse A ist.The lever member 30 has a coupling portion 34. The coupling portion 34 is coupled to the disk-shaped portion 12a of the housing 12 (see also Figs FIG. 1 ). The coupling portion 34 has a recess 36. The recess 36 is formed such that on the coupling portion 34, two contact surfaces 38 are formed, which are spaced apart. The two contact surfaces 38 of the coupling portion 34 abut against a contact surface 40 of the disk-shaped portion 12 a of the housing 12. The contact surface 40 of the disk-shaped portion 12a of the housing 12 has a surface normal which is parallel to the force action axis A.

In der in den Figuren 3 bis 6 gezeigten Ausführungsform des Hebelelements 30 sind die zwei Kontaktflächen 38 des Kopplungsabschnitts 34 als konvex gewölbte Flächen ausgebildet. Damit kann erreicht werden, dass sich das Hebelelement 30 wälzend gegenüber dem scheibenförmigen Abschnitt 12a des Gehäuses 12 abrollen kann.In the in the FIGS. 3 to 6 shown embodiment of the lever member 30, the two contact surfaces 38 of the coupling portion 34 are formed as convex curved surfaces. It can thus be achieved that the lever element 30 can roll over the disk-shaped section 12a of the housing 12 in a rolling manner.

Im Folgenden soll die Funktionsweise des Hebelelements 30 mit der Ausnehmung 36 des Kopplungsabschnitts 34 anhand der Figuren 7 und 8 erläutert werden:Below is the operation of the lever member 30 with the recess 36 of the coupling portion 34 on the basis of FIGS. 7 and 8 be explained:

In Figur 7 weist der scheibenförmige Abschnitt 12a des Gehäuses 12 eine Erhebung 44 auf, die zwischen den Kontaktflächen 38 des Kopplungsabschnitts 34 im Bereich der Ausnehmung 36 des Kopplungsabschnitts 34 liegt. Aufgrund der Ausbildung der Ausnehmung 36 des Kopplungsabschnitts 34 kann sich das Hebelelement 30 ohne Beeinflussung durch die Erhebung 44 gegenüber dem scheibenförmigen Abschnitt 12a des Gehäuses 12 abstützen. Eine Bewegung des Hebelelements 30 gegenüber dem scheibenförmige Abschnitt 12a des Gehäuses 12 über die Kontaktflächen 38 des Kopplungsabschnitts 34 und die Kontaktfläche 40 kann so ungestört von der Erhebung 44 erfolgen.In FIG. 7 the disc-shaped portion 12a of the housing 12 has a raised portion 44 which lies between the contact surfaces 38 of the coupling portion 34 in the region of the recess 36 of the coupling portion 34. Due to the design of the recess 36 of the coupling portion 34, the lever member 30 may be supported without interference by the survey 44 relative to the disc-shaped portion 12 a of the housing 12. A movement of the lever member 30 relative to the disk-shaped portion 12a of the housing 12 via the contact surfaces 38 of the coupling portion 34 and the contact surface 40 can be done so undisturbed by the survey 44.

In Figur 8 hat der scheibenförmige Abschnitt 12a des Gehäuses 12 eine weitere Erhebung 44a, die im Bereich einer der Kontaktflächen 38 des Kopplungsabschnitts 34 liegt. Aufgrund der Ausbildung der Ausnehmung 36 des Kopplungsabschnitts 34 hat das Hebelelement 30 im Bereich der Ausnehmung 36 eine geringe Steifigkeit. Damit kann erreicht werden, dass bei einer Bewegung des Hebelelements 30 gegenüber dem scheibenförmige Abschnitt 12a des Gehäuses 12 das Hebelelement 30 im Bereich der Ausnehmung 36 nachgeben kann. Damit kann erreicht werden, dass die weitere Erhebung 44a nur einen geringen Einfluss auf die Bewegung des Hebelelements 30 und damit die Bewegung des Abtriebselements 32 hat.In FIG. 8 the disk-shaped portion 12 a of the housing 12 has a further elevation 44 a, which lies in the region of one of the contact surfaces 38 of the coupling portion 34. Due to the formation of the recess 36 of the coupling portion 34, the lever member 30 in the region of the recess 36 has a low rigidity. It can thereby be achieved that upon movement of the lever element 30 relative to the disk-shaped section 12a of the housing 12, the lever element 30 can yield in the region of the recess 36. It can thereby be achieved that the further elevation 44a has only a slight influence on the movement of the lever element 30 and thus the movement of the output element 32.

Das Hebelelement 30 weist weitere Kopplungsabschnitte 42a, 42b auf (Figur 9) . Einer der weiteren Kopplungsabschnitte 42a ist mit dem Abtriebselement 32 gekoppelt. Ein anderer der weiteren Kopplungsabschnitte 42b ist mit dem glockenförmigen Bauelement 27 des Antriebselements 26 gekoppelt (siehe Figur 1). In der in Figur 9 gezeigten Ausführungsform ist der weitere Kopplungsabschnitt 42a, der mit dem Abtriebselement 32 gekoppelt ist, derart gegenüber dem weiteren Kopplungsabschnitt 42b, der mit dem Antriebselement 26 gekoppelt ist, angeordnet, dass zwischen den weiteren Kopplungsabschnitten 42a, 42b ein möglichst großer Abstand an dem Hebelelement 30 erreicht wird. Durch die Ausbildung eines möglichst großen Abstands zwischen den weiteren Kopplungsabschnitten 42a, 42b kann das Hebelelement 30 im Bereich zwischen den weiteren Kopplungsabschnitten 42a, 42b eine geringere Steifigkeit haben als im Bereich der weiteren Kopplungsabschnitte 42a, 42b. Damit kann erreicht werden, dass bei einer Bewegung des Hebelelements 30 gegenüber dem Antriebselements 26 beziehungsweise dem Abtriebselement 32 das Hebelelement 30 im Bereich zwischen den weiteren Kopplungsabschnitten 42a, 42b nachgeben kann. Damit kann erreicht werden, dass mechanische Unregelmäßigkeiten an dem Antriebselement 26 beziehungsweise dem Abtriebselement 32 nur einen geringen Einfluss auf die Bewegung des Hebelelements 30 und in der Folge auf die Bewegung des Abtriebselements 32 hat.The lever element 30 has further coupling sections 42a, 42b ( FIG. 9 ). One of the further coupling sections 42a is coupled to the output element 32. Another of the further coupling sections 42b is coupled to the bell-shaped component 27 of the drive element 26 (see FIG FIG. 1 ). In the in FIG. 9 In the embodiment shown, the further coupling section 42a, which is coupled to the output element 32, is arranged opposite the further coupling section 42b, which is coupled to the drive element 26, such that the greatest possible distance to the lever element 30 is achieved between the further coupling sections 42a, 42b becomes. By forming the largest possible distance between the further coupling sections 42a, 42b, the lever element 30 may have a lower rigidity in the area between the further coupling sections 42a, 42b than in the region of the further coupling sections 42a, 42b. It can thus be achieved that upon movement of the lever element 30 relative to the drive element 26 or the output element 32, the lever element 30 can yield in the region between the further coupling sections 42a, 42b. It can thus be achieved that mechanical irregularities on the drive element 26 or the output element 32 have only a small influence on the movement of the lever element 30 and, as a consequence, on the movement of the output element 32.

Durch die Ausbildung der Hebelelemente 30 mit der Ausnehmung 36 des Kopplungsabschnitts 34 kann erreicht werden, dass die Hebelelemente 30 auch über eine Vielzahl von Einspritzvorgängen mit dem scheibenförmigen Abschnitt 12a des Gehäuses 12 zusammenwirken können, ohne dass sich das Übertragungsverhalten zwischen den Hebelelementen 30 und dem scheibenförmigen Abschnitt 12a des Gehäuses 12 entscheidend verändert. 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 insbesondere des Hebelelements 30 und/oder des scheibenförmigen Abschnitts 12a des Gehäuses 12, wie beispielsweise durch die Erhebungen 44, 44a nur in geringem Maße oder gar nicht auf die Einspritzmengen des Einspritzventils 10 auswirken.Due to the design of the lever elements 30 with the recess 36 of the coupling portion 34 can be achieved that the lever elements 30 can interact via a plurality of injection operations with the disc-shaped portion 12 a of the housing 12 without the transfer behavior between the lever members 30 and the disk-shaped Section 12a of the housing 12 changed significantly. 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, in particular of the lever element 30 and / or the disk-shaped portion 12a of the housing 12, such as by the elevations 44, 44a only to a small extent or not at all affect the injection quantities of the injection valve 10.

Claims (3)

  1. Lever device (28) for a fuel injection valve with
    - a housing (12) which has a housing recess (14),
    - at least one lever element (30) which is arranged in the housing recess (14) and has a coupling portion (34) which is coupled to a portion (12a) of the housing (12),
    - a drive element (26) which is arranged in the housing recess (14) and is coupled to the at least one lever element (30) to act on the at least one lever element in the direction of the force-action axis (A), and
    - an output element (32) arranged in the housing recess (14) which is coupled to the at least one lever element (30) such that the output element (32) can be moved in the direction of the force-action axis (A) by means of the at least one lever element (30), characterized in that the coupling portion (34) of the lever element (30) has at least one recess (36), by means of which at least two contact faces (38) of the coupling portion (34) are formed which are spaced apart from each other and lie on the portion (12a) of the housing (12).
  2. Lever device (28) according to Claim 1, wherein the at least two contact faces (38) of the coupling portion (34) are formed as convex curved faces.
  3. Fuel injection valve (10) which comprises
    - a lever device (28) according to either of the preceding claims,
    - a valve needle (20) which is coupled to the output
    element (32) or which forms the output element (32),
    wherein the drive element (26) and the valve needle (20) are coupled together via the lever device (28) such that the valve needle (20) in a closed position prevents a fluid flow through the fuel injection valve (10), and otherwise allows a fluid flow through the fuel injection valve (10).
EP12816266.6A 2011-12-30 2012-12-19 Lever device and a fuel injection valve Active EP2771564B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011090200A DE102011090200A1 (en) 2011-12-30 2011-12-30 Lever and injector
PCT/EP2012/076158 WO2013098155A1 (en) 2011-12-30 2012-12-19 Lever device and a fuel injection valve

Publications (2)

Publication Number Publication Date
EP2771564A1 EP2771564A1 (en) 2014-09-03
EP2771564B1 true EP2771564B1 (en) 2015-10-14

Family

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Application Number Title Priority Date Filing Date
EP12816266.6A Active EP2771564B1 (en) 2011-12-30 2012-12-19 Lever device and a fuel injection valve

Country Status (4)

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US (1) US9376993B2 (en)
EP (1) EP2771564B1 (en)
DE (1) DE102011090200A1 (en)
WO (1) WO2013098155A1 (en)

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DE102011090200A1 (en) 2011-12-30 2013-07-04 Continental Automotive Gmbh Lever and injector
JP6443109B2 (en) 2015-02-17 2018-12-26 株式会社Ｓｏｋｅｎ Fuel injection valve

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US20150021418A1 (en) 2015-01-22
DE102011090200A1 (en) 2013-07-04
EP2771564A1 (en) 2014-09-03
US9376993B2 (en) 2016-06-28
WO2013098155A1 (en) 2013-07-04

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