EP2041425B1 - Injection system and method for producing an injection system - Google Patents

Injection system and method for producing an injection system Download PDF

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Publication number
EP2041425B1
EP2041425B1 EP06805998A EP06805998A EP2041425B1 EP 2041425 B1 EP2041425 B1 EP 2041425B1 EP 06805998 A EP06805998 A EP 06805998A EP 06805998 A EP06805998 A EP 06805998A EP 2041425 B1 EP2041425 B1 EP 2041425B1
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EP
European Patent Office
Prior art keywords
actuator
injection system
nozzle needle
compensator
lever
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EP06805998A
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German (de)
French (fr)
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EP2041425A1 (en
Inventor
Maximilian Kronberger
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Continental Automotive GmbH
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Continental Automotive GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/705—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49428—Gas and water specific plumbing component making

Definitions

  • the invention relates to an injection system and a method for producing an injection system.
  • Injection systems with at least one injector and in particular oil-less common-rail injection systems require a control element or an actuator, such as a piezo actuator in the high-pressure chamber of the injector.
  • the technical field of the invention relates in particular to common rail injectors or injection systems with an actuator or an actuator for opening and closing a nozzle by means of a nozzle needle in the high pressure chamber, which has a hydraulic longitudinal compensation device and a lever translator for actuating the nozzle needle.
  • the longitudinal compensation device has a piston engaging in a bore of the bottom plate of the piezo stack of the piezoactuator, a hydraulic volume, for example a fuel volume, between the bottom plate and the piston and a return spring for returning the piezoelectric stack.
  • Such an injection system is for example from the DE 101 45 620 B4 . DE 101 01 799A . DE10242376A or DE 102 54 186A known.
  • the above-mentioned lever translator has the function of translating the stroke provided by the piezo stack into a modified, in particular enlarged, stroke.
  • the lever translator usually has an actuator lever, which is coupled to the piezo-actuator, and a needle lever, which is coupled to the nozzle needle on.
  • the actuator lever and the needle lever form a two-stage lever device, which requires a large height due to the two-stage.
  • the applicant has found in an attempt with such a lever translator that when actuated the lever, the introduced tilting moment in the nozzle needle can have a negative effect on function.
  • Another object is to provide a simple and in particular cost-effective injection system with a lever translator with in particular minimal friction losses.
  • the compensation device results from the arrangement of the compensation device between the actuator and the lever device, that a potentially different force effect of the actuator is balanced on the one-armed lever of the lever device and thus no side force of the lever device can arise on the nozzle needle.
  • the one-armed levers of the lever device are symmetrical, in particular rotationally symmetrical, so that no transverse forces resulting from friction and transverse movements can be entered into the system both on the drive and on the needle, which in turn would lead to increased friction on the components coupled to them ,
  • a reduced friction between the components or components of the injection system is achieved by the inventive arrangement in the transmission of the stroke. This reduction of the friction losses according to the invention results in an improvement in the durability and the lifetime of the injection system.
  • Another advantage of the arrangement of the compensation device is that a non-coaxial arrangement of the actuator and the lever translation device is possible without having to accept an inhomogeneous force of the actuator on the one-armed lever of the lever translation device in purchasing. This results in a degree of freedom for the design of the design of the injection system.
  • Another advantage of the present invention is that no two-stage lever must be used. As a result of the use of one-armed lever results in a reduced or minimized length of the lever translation device and thus the Einspitzsystems. Furthermore, the injection system according to the invention, due to the elimination of components, in particular two equal levers, lower production costs.
  • the actuator is designed as a magnetic actuator or as a piezoelectric actuator.
  • the magnetic actuator on a flat armature or a plunger armature.
  • the magnetic Akor with the plunger anchor on a secondary air column is achieved by the use of the secondary air gap that the magnetic actuator can provide a linear force curve over the stroke.
  • the magnet actuator with the flat armature on a toroidal coil or a toroidal coil preferably has a square cross-section.
  • the one-armed levers are separated from each other by means of a separating gap.
  • a hydraulic compensator which has a Kompensatortopf and engaging in the Kompensatortopf piston, between the Kondensatordopf and the piston, a gap is formed, which is filled with a fluid, in particular the fuel, wherein the space for hydraulic compensation with a Equalizing volume is coupled via a flow gap.
  • a bottom plate of the piezoelectric actuator is coupled to the compensator and the compensation device has the piston.
  • the necessary for the force balance mobility of the compensation device or the compensation element is ensured by a relatively short cylindrical portion of the sealing surface of the piston. The maximum length of this range depends on the necessary clearance for the length compensation. Alternatively, a spherical sealing surface can be provided.
  • the bottom plate of the piezo-actuator is coupled to the piston and the compensation device has the Kompensatortopf.
  • the piezo actuator has a controllable piezo stack.
  • the controllable piezo stack provides the stroke for actuating the nozzle needle in a closing direction or in an opening direction as a function of a control signal.
  • the injection system 1 for injecting fuel P at a predetermined fuel pressure comprises an actuator 2, 3 and a lever transmission device 5 with a compensation device 6 and a lever device 7.
  • the actuator 2, 3 provides a lift for lifting a nozzle needle 4, which opens a nozzle into which the fuel P is injected.
  • the lever translation device 5 for translating the provided stroke in a modified stroke accordingly has the compensation device 6, which is coupled to the actuator 2, 3, and the lever device 7, which is coupled to the nozzle needle 4.
  • the lever device 7 at least two symmetrically arranged, one-armed lever 8a, 8b, which each contact by means of a single needle head rest 9a, 9b a nozzle needle head 10 of the nozzle needle 4 when lifting the nozzle needle 4.
  • the compensation device 6 according to the invention is suitable for compensating for a different or inhomogeneous force action of the actuator 2, 3 on the one-armed levers 8a, 8b.
  • the injection system 1 further comprises a hydraulic compensator 14.
  • the hydraulic compensator 14 has a Kompensatortopf 15 and an engaging in the Kompensatortopf 15 piston 16. Between the Kompensatortopf 15 and the piston 16, a gap 17 is formed, which is filled with a fluid, in particular the fuel P.
  • the intermediate space 17 is coupled to a compensation volume via a flow gap 18 for hydraulic compensation.
  • the injection system 1 a piezo actuator 3 as an actuator.
  • the piezo-actuator 3 has a controllable piezo-stack 19, which in response to a control signal (not shown) provides the stroke for actuating the nozzle needle 4 in a closing direction R1 or in an opening direction R2.
  • the piezo stack 19 is preferably surrounded by a corrugated tube (not shown).
  • the closing of the nozzle needle 4 in the closing direction R1 is, however, substantially by a spring (not shown), which generates the necessary closing force, which is suitable when the piezo-stack 19 is discharged and retracts to a predetermined starting position.
  • the injection system 1 according to the Fig. 1-5 a support device 21, which supports the lever device 7.
  • the one-armed levers 8a, 8b roll on the support device 21 during the transfer of the stroke.
  • the injection system 1 preferably has a return spring 22 for resetting the nozzle needle 4, which couples the nozzle needle 4 to the housing 20 or to the support device 21.
  • a bottom plate 23 of the piezo-actuator 3 is coupled to the Kompensatortopf 15 and the compensation device 6 has the piston 16.
  • the bottom plate 23 of the piezo-actuator 3 may be coupled to the piston 16 and the compensation device 6 may have a Kompensatortopf 15.
  • the Fig. 3 and 4 show detailed views of a section of a third embodiment of the injection system according to the invention 1.
  • the Fig. 3 and 4 in particular show the lever translation device 5 with the balancing device 6 and the lever device 7.
  • the lever device 7 has two symmetrically arranged, one-armed lever 8a, 8b.
  • a one-armed lever 8a, 8b is in the context of this application a lever, which is shaped at least on one side like a one-armed fork. This one side is the side of the lever with which it lifts the nozzle needle head 10.
  • the one-armed lever 8a, 8b is substantially U-shaped.
  • the one-armed levers 8a, 8b contact the nozzle needle head 10 of the nozzle needle 4 for lifting the nozzle needle 4 in each case by means of a single needle head rest 9a, 9b.
  • the nozzle needle 4 By lifting the nozzle needle 4 by the one-armed lever 8a, 8b, the nozzle needle 4 is lifted as it were in a rotational movement of the nozzle needle seat (not shown).
  • the one-armed levers 8a, 8b have a convex contour in a contact area with the support device 21 on which the one-sided levers 8a, 8b are mounted.
  • the one-armed levers 8a, 8b are separated from one another by means of a separating gap 13.
  • Reference numeral 24 in FIG Fig. 4 denotes a bore for the nozzle needle. 4
  • a fourth embodiment of the injection system 1 according to the invention is shown.
  • the fourth embodiment of the injection system 1 according to Fig. 5 differs in particular from the first and second embodiments according to the Fig. 1 and 2 to the effect that not a piezoelectric actuator 3, but a magnetic actuator 2 is used as the actuator.
  • Fig. 5 shows a solenoid actuator 2 with a plunger armature 11.
  • a magnet actuator 2 with a flat armature can be used.
  • the magnet actuator 2 according to Fig. 5 with the plunger armature 11 has a secondary air gap 12 between the coil 27 and the plunger armature 11.
  • the coil 27 is coupled to a magnet pot 26. In a vertical direction above the coil 27, a working air gap 25 is formed between the coil 27 and the plunger armature 11.
  • the stroke of the magnetic actuator 2 is transmitted to the compensating device 6 by means of a plunger 28.
  • the magnetic actuator 2 is in a low-pressure region ND of the injection system 1 and the lever translation device 5 and the nozzle needle 4 and potentially coupled therebetween devices are arranged in the high-pressure region HD of the injection system 1.
  • a high-pressure port 29 for supplying the fuel P at the predetermined fuel pressure which is in a range of 1,500-2,000 bar, for example. Further shows Fig. 5 a leakage oil port 30 which is coupled to the high-pressure region HD of the injection system 1.
  • Fig. 5 shows the arrangement of needle guides 31 in a needle shaft 32 for improved guidance of the nozzle needle 4.
  • the needle guides 31 can also be used in the previous embodiments.
  • a capsule 33 protects the magnetic actuator 2 from external influences.

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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)

Abstract

An injection system (1) for injecting fuel at a predetermined fuel pressure has: an actuator (2, 3) providing a stroke for lifting an injector needle (4) that opens a nozzle into which the fuel is injected; a leverage apparatus (5) for translating the provided stroke into a modified stroke, the apparatus has a compensating device (6) coupled to the actuator (2, 3), and a lever device (7), which is coupled to the injector needle (4), wherein the lever device has at least two symmetrically disposed, single-arm levers (8a, 8b), which each come in contact with an injector needle head (10) of the injector needle (4) when lifting the injector needle (4) by means of a single needle head support (9a, 9b); and wherein the compensating device (6) is suited to compensate a varying force application of the actuator (2, 3) on the single-arm lever (8a, 8b).

Description

Die Erfindung betrifft ein Einspritzsystem und ein Verfahren zum Herstellen eines Einspritzsystems.The invention relates to an injection system and a method for producing an injection system.

Einspritzsysteme mit zumindest einem Injektor und insbesondere lecköllose Common-Rail-Einspritzsysteme erfordern ein Steuerelement oder einen Aktor, wie beispielsweise einen Piezo-Aktor im Hochdruckraum des Injektors. Das technische Gebiet der Erfindung betrifft insbesondere Common-Rail-Injektoren oder Einspritzsysteme mit einem Aktor oder einem Aktuator zum Öffnen und Schließen einer Düse mittels einer Düsennadel im Hochdruckraum, der eine hydraulische Längsausgleichsvorrichtung und einen Hebelübersetzer zur Betätigung der Düsennadel aufweist. Die Längsausgleichsvorrichtung weist insbesondere einen in einer Bohrung der Bodenplatte des Piezo-Stapels des Piezo-Aktors eingreifenden Kolben, ein hydraulisches Volumen, beispielsweise ein Kraftstoffvolumen, zwischen der Bodenplatte und dem Kolben und eine Rückstellfeder zum Rückstellen des Piezo-Stapels auf. Ein solches Einspritzsystem ist beispielsweise aus der DE 101 45 620 B4 , DE 101 01 799A , DE10242376A oder DE 102 54 186A bekannt. Oben erwähnter Hebelübersetzer hat die Funktion, den von dem Piezo-Stapel bereitgestellten Hub in einen veränderten, insbesondere vergrößerten Hub zu übersetzen. Dazu weist der Hebelübersetzer in der Regel einen Aktorhebel, der mit dem Piezo-Aktor gekoppelt ist, und einen Nadelhebel, der mit der Düsennadel gekoppelt ist, auf. Der Aktorhebel und der Nadelhebel bilden eine zweistufige Hebelvorrichtung aus, welche infolge der Zweistufigkeit eine große Bauhöhe benötigt. Die Anmelderin hat in einem Versuch mit einem solchen Hebelübersetzer festgestellt, dass bei der Betätigung der Hebel das eingeleitete Kippmoment in die Düsennadel einen negativen Funktionseinfluss zur Folge haben kann. Insbesondere wirkt bei der Hubbewegung eine resultierende Seitenkraft auf die Düsennadel. Dadurch entsteht in der Nadelführung unerwünschte Reibkräfte, welche den Energiebedarf zum Heben der Düsennadel erhöhen. Weiterhin ist der Anmelderin intern bekannt, diesen negativen Funktionseinfluss mittels einer zusätzlichen Führung im Bereich des Nadelschafts zu korrigieren. Allerdings führt auch eine außermittige Krafteinleitung in den Hebelübersetzer zu erhöhten Reibspuren im Übergangsbereich der Baugruppen, beispielsweise zwischen Nadelhebel und Düsennadelkopf der Düsennadel. Dadurch entstehen hohe Reibverluste zwischen diesen Komponenten, beispielsweise zwischen dem Nadelhebel und dem Düsennadelkopf. Nachteiligerweise bedingen diese Reibverluste eine verkürzte Lebensdauer des Einspritzsystems. Auch verursachen diese Reibverluste einen Verlust an Energie bei der Übersetzung oder Übertragung des von dem Aktor bereitgestellten Hubes.Injection systems with at least one injector and in particular oil-less common-rail injection systems require a control element or an actuator, such as a piezo actuator in the high-pressure chamber of the injector. The technical field of the invention relates in particular to common rail injectors or injection systems with an actuator or an actuator for opening and closing a nozzle by means of a nozzle needle in the high pressure chamber, which has a hydraulic longitudinal compensation device and a lever translator for actuating the nozzle needle. In particular, the longitudinal compensation device has a piston engaging in a bore of the bottom plate of the piezo stack of the piezoactuator, a hydraulic volume, for example a fuel volume, between the bottom plate and the piston and a return spring for returning the piezoelectric stack. Such an injection system is for example from the DE 101 45 620 B4 . DE 101 01 799A . DE10242376A or DE 102 54 186A known. The above-mentioned lever translator has the function of translating the stroke provided by the piezo stack into a modified, in particular enlarged, stroke. For this purpose, the lever translator usually has an actuator lever, which is coupled to the piezo-actuator, and a needle lever, which is coupled to the nozzle needle on. The actuator lever and the needle lever form a two-stage lever device, which requires a large height due to the two-stage. The applicant has found in an attempt with such a lever translator that when actuated the lever, the introduced tilting moment in the nozzle needle can have a negative effect on function. In particular, a resultant lateral force acts on the nozzle needle during the lifting movement. This creates unwanted frictional forces in the needle guide, which increase the energy required to lift the nozzle needle. Furthermore, the applicant is internally known to correct this negative functional influence by means of an additional guide in the region of the needle shaft. However, an eccentric introduction of force into the lever translator also leads to increased friction marks in the transition region of the assemblies, for example between the needle lever and the nozzle needle head of the nozzle needle. This results in high friction losses between these components, for example between the needle lever and the nozzle needle head. Disadvantageously, these friction losses cause a shortened life of the injection system. Also, these frictional losses cause a loss of energy in the translation or transmission of the stroke provided by the actuator.

Demnach ist es eine Aufgabe der vorliegenden Erfindung, ein Einspritzsystem zu schaffen, bei welchem eine aussermittige Krafteinleitung auf die Düsennadel ausgeglichen ist.Accordingly, it is an object of the present invention to provide an injection system in which an off-center force is balanced on the nozzle needle.

Des Weiteren ist es eine Aufgabe, ein Einspritzsystem mit reduzierten oder minimierten Reibverlusten bereitzustellen.Furthermore, it is an object to provide an injection system with reduced or minimized friction losses.

Eine weitere Aufgabe ist es, ein einfaches und insbesondere kostengünstiges Einspritzsystem mit einem Hebelübersetzer mit insbesondere minimalen Reibverlusten zu schaffen.Another object is to provide a simple and in particular cost-effective injection system with a lever translator with in particular minimal friction losses.

Außerdem ist es eine Aufgabe, ein einfaches und insbesondere kostengünstiges Einspritzsystem mit einer reduzierten oder minimierten Baulänge zu schaffen.Moreover, it is an object to provide a simple and in particular inexpensive injection system with a reduced or minimized length.

Erfindungsgemäß wird zumindest eine dieser gestellten Aufgaben durch ein Einspritzsystem mit den Merkmalen des Patentanspruchs 1 und/oder durch ein Verfahren zum Herstellen eines Einspritzsystems mit den Merkmalen des Patentanspruchs 10 gelöst.According to the invention, at least one of these objects is achieved by an injection system having the features of patent claim 1 and / or by a method for producing an injection system having the features of patent claim 10.

Demgemäß wird erfindungsgemäß ein Einspritzsystem zum Einspritzen von Kraftstoff unter einem vorbestimmten Kraftstoffdruck vorgeschlagen, welches aufweist:

  • einen Aktor, welcher einen Hub zum Heben einer Düsennadel bereitstellt, die eine Düse öffnet, in die der Kraftstoff eingespritzt wird;
  • eine Hebelübersetzungsvorrichtung zur Übersetzung des bereitgestellten Hubes in einen veränderten Hub, welche eine Ausgleichseinrichtung, die mit dem Aktor gekoppelt ist, und eine Hebeleinrichtung, die mit der Düsennadel gekoppelt ist, aufweist,
  • wobei die Hebeleinrichtung zumindest zwei symmetrisch angeordnete, einarmige Hebel aufweist, die jeweils mittels einer einzelnen Nadelkopfauflage einen Düsennadelkopf der Düsennadel beim Heben der Düsennadel kontaktieren; und
  • wobei die Ausgleichseinrichtung dazu geeignet ist, eine unterschiedliche Kraftwirkung des Aktors auf die einarmigen Hebel auszugleichen.
Accordingly, an injection system for injecting fuel under a predetermined fuel pressure is proposed according to the invention, which comprises:
  • an actuator which provides a lift for lifting a nozzle needle opening a nozzle into which the fuel is injected;
  • a lever translation device for translating the provided stroke into a modified stroke having a balancer coupled to the actuator and a lever coupled to the nozzle needle;
  • wherein the lever device has at least two symmetrically arranged, one-armed levers which each contact a nozzle needle head of the nozzle needle during lifting of the nozzle needle by means of a single needle head rest; and
  • wherein the compensation device is adapted to compensate for a different force effect of the actuator on the one-armed lever.

Außerdem wird ein Verfahren zum Herstellen eines Einspritzsystems zum Einspritzen von Kraftstoff unter einem vorbestimmten Kraftstoffdruck vorgeschlagen, welches folgende Schritte aufweist:

  • Anordnen eines Aktors in einem Gehäuse des Einspritzsystems, welcher einen Hub zum Heben einer Düsennadel bereitstellt, die eine Düse öffnet, in die der Kraftstoff eingespritzt wird;
  • Koppeln des Aktors mit einer Hebelübersetzungsvorrichtung zur Übersetzung des bereitgestellten Hubes in einen veränderten, insbesondere vergrößerten Hub, welcher eine Ausgleichseinrichtung, welche mit dem Aktor gekoppelt ist, und eine Hebeleinrichtung aufweist, welche mit der Düsennadel gekoppelt ist, wobei die Hebeleinrichtung zumindest zwei symmetrisch angeordnete, einarmige Hebel aufweist, die jeweils mittels einer einzelnen Nadelkopfauflage einen Düsennadelkopf der Düsennadel zum Heben der Düsennadel kontaktieren, wobei die Ausgleichseinrichtung dazu geeignet ist, eine unterschiedliche Krafteinwirkung des Aktors auf die einarmigen Hebel auszugleichen.
In addition, a method is proposed for producing an injection system for injecting fuel under a predetermined fuel pressure, comprising the following steps:
  • Arranging an actuator in a housing of the injection system, which provides a stroke for lifting a nozzle needle, which opens a nozzle, in which the fuel is injected;
  • Coupling of the actuator with a lever translation device for translating the provided stroke in a modified, in particular enlarged stroke, which has a compensation device which is coupled to the actuator, and a lever device which is coupled to the nozzle needle, wherein the lever device at least two symmetrically arranged, having one-armed lever, each contact by means of a single needle head support a nozzle needle head of the nozzle needle for lifting the nozzle needle, wherein the balancing device is adapted to a different Force of the actuator to compensate for the one-armed lever.

Vorteilhafterweise ergibt sich durch die Anordnung der Ausgleichseinrichtung zwischen dem Aktor und der Hebeleinrichtung, dass eine potentiell unterschiedliche Kraftwirkung des Aktors auf die einarmigen Hebel der Hebeleinrichtung ausgeglichen wird und somit keine Seitenkraftwirkung der Hebeleinrichtung auf die Düsennadel entstehen kann. Daraus ergibt sich zum einen eine geringere Verschleißwirkung infolge der reduzierten Reibung und zum anderen ein niedrigerer Energiebedarf zum Heben der Düsennadel. Weiter sind die einarmigen Hebel der Hebeleinrichtung symmetrisch, insbesondere rotationssymmetrisch aufgebaut, sodass sowohl am Antrieb als auch an der Nadel keine aus Reibung und Querbewegungen resultierenden Querkräfte in das System eingetragen werden können, welche wiederum zu einer erhöhten Reibung an den an sie gekoppelten Bauteilen führen würden. Insgesamt wird durch die erfindungsgemäße Anordnung bei der Übertragung des Hubes eine verminderte Reibung zwischen den Komponenten oder Bauteilen des Einspritzsystems erreicht. Aus dieser erfindungsgemäßen Reduzierung der Reibungsverluste resultiert eine Verbesserung der Dauerhaltbarkeit und der Lebenszeit des Einspriztsystems.Advantageously, results from the arrangement of the compensation device between the actuator and the lever device, that a potentially different force effect of the actuator is balanced on the one-armed lever of the lever device and thus no side force of the lever device can arise on the nozzle needle. This results in a lower wear effect due to the reduced friction and on the other hand a lower energy requirement for lifting the nozzle needle. Furthermore, the one-armed levers of the lever device are symmetrical, in particular rotationally symmetrical, so that no transverse forces resulting from friction and transverse movements can be entered into the system both on the drive and on the needle, which in turn would lead to increased friction on the components coupled to them , Overall, a reduced friction between the components or components of the injection system is achieved by the inventive arrangement in the transmission of the stroke. This reduction of the friction losses according to the invention results in an improvement in the durability and the lifetime of the injection system.

Ein weiterer Vorteil der Anordnung der Ausgleichseinrichtung liegt darin, dass eine nicht-koaxiale Anordnung des Aktors und der Hebelübersetzungsvorrichtung möglich ist, ohne eine inhomogene Kraftwirkung des Aktors auf die einarmigen Hebel der Hebelübersetzungsvorrichtung in Kauf nehmen zu müssen. Damit ergibt sich ein Freiheitsgrad für die Ausgestaltung der Bauform des Einspritzsystems.Another advantage of the arrangement of the compensation device is that a non-coaxial arrangement of the actuator and the lever translation device is possible without having to accept an inhomogeneous force of the actuator on the one-armed lever of the lever translation device in purchasing. This results in a degree of freedom for the design of the design of the injection system.

Ein weiterer Vorteil der vorliegenden Erfindung liegt darin, dass keine zweistufigen Hebel eingesetzt werden müssen. Infolge der Verwendung einarmiger Hebel ergibt sich eine reduzierte bzw. minimierte Baulänge der Hebelübersetzungsvorrichtung und somit des Einspitzsystems. Weiterhin weist das erfindungsgemäße Einspritzsystem aufgrund des Entfalls von Bauteilen, insbesondere zweier gleicher Hebel, niedrigere Herstellungskosten auf.Another advantage of the present invention is that no two-stage lever must be used. As a result of the use of one-armed lever results in a reduced or minimized length of the lever translation device and thus the Einspitzsystems. Furthermore, the injection system according to the invention, due to the elimination of components, in particular two equal levers, lower production costs.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen sowie der Beschreibung unter Bezugnahme auf die Zeichnungen.Advantageous embodiments and modifications of the invention will become apparent from the dependent claims and the description with reference to the drawings.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist der Aktor als ein Magnet-Aktor oder als ein Piezo-Aktor ausgebildet.According to a preferred embodiment of the invention, the actuator is designed as a magnetic actuator or as a piezoelectric actuator.

Gemäß einer bevorzugten Weiterbildung der Erfindung weist der Magnet-Aktor einen Flachanker oder einen Tauchanker auf.According to a preferred embodiment of the invention, the magnetic actuator on a flat armature or a plunger armature.

Gemäß einer weiteren bevorzugten Weiterbildung weist der Magnet-Akor mit dem Tauchanker eine Nebenluftspalte auf. Vorteilhafterweise wird durch den Einsatz des Nebenluftspaltes erreicht, dass der Magnet-Aktor einen linearen Kraftverlauf über den Hub bereitstellen kann.According to a further preferred development, the magnetic Akor with the plunger anchor on a secondary air column. Advantageously, it is achieved by the use of the secondary air gap that the magnetic actuator can provide a linear force curve over the stroke.

Gemäß einer weiteren bevorzugten Ausgestaltung weist der Magnet-Aktor mit dem Flachanker eine Torus-Spule oder eine Toroid-Spule auf. Der Flachanker weist vorzugsweise einen quadratischen Querschnitt auf.According to a further preferred embodiment, the magnet actuator with the flat armature on a toroidal coil or a toroidal coil. The flat anchor preferably has a square cross-section.

Gemäß einer weiteren bevorzugten Ausgestaltung sind die einarmigen Hebel mittels eines Trennspaltes voneinander getrennt.According to a further preferred embodiment, the one-armed levers are separated from each other by means of a separating gap.

Erfindungsgemäß ist ein hydraulischer Kompensator vorgesehen, welcher einen Kompensatortopf und einen in den Kompensatortopf eingreifenden Kolben aufweist, wobei zwischen dem Kondensatortopf und dem Kolben ein Zwischenraum ausgebildet ist, der mit einem Fluid, insbesondere dem Kraftstoff gefüllt ist, wobei der Zwischenraum zum hydraulischen Ausgleich mit einem Ausgleichsvolumen über einen Strömungsspalt gekoppelt ist. Durch Einsatz des hydraulischen Kompensators können vorteilhafterweise Toleranzen der Bauteile des Einspitzsystems sowie Temperaturdehnungseffekte ausgeglichen werden.According to the invention, a hydraulic compensator is provided, which has a Kompensatortopf and engaging in the Kompensatortopf piston, between the Kondensatordopf and the piston, a gap is formed, which is filled with a fluid, in particular the fuel, wherein the space for hydraulic compensation with a Equalizing volume is coupled via a flow gap. By using the hydraulic compensator can advantageously tolerances of Components of the Einspitzsystems and temperature expansion effects are compensated.

Gemäß einer weiteren bevorzugten Ausgestaltung ist eine Bodenplatte des Piezo-Aktors mit dem Kompensator gekoppelt und die Ausgleichseinrichtung weist den Kolben auf. Die für den Kraftausgleich notwendige Beweglichkeit der Ausgleichseinrichtung oder des Ausgleichselementes wird durch einen verhältnismäßig kurzen zylindrischen Bereich der Dichtfläche des Kolbens sichergestellt. Die maximale Länge dieses Bereichs ist vom notwendigen Spiel für den Längenausgleich abhängig. Alternativ kann auch eine kugelförmige Dichtfläche vorgesehen werden.According to a further preferred embodiment, a bottom plate of the piezoelectric actuator is coupled to the compensator and the compensation device has the piston. The necessary for the force balance mobility of the compensation device or the compensation element is ensured by a relatively short cylindrical portion of the sealing surface of the piston. The maximum length of this range depends on the necessary clearance for the length compensation. Alternatively, a spherical sealing surface can be provided.

Gemäß einer weiteren bevorzugten Ausgestaltung ist die Bodenplatte des Piezo-Aktors mit dem Kolben gekoppelt und die Ausgleichseinrichtung weist den Kompensatortopf auf.According to a further preferred embodiment, the bottom plate of the piezo-actuator is coupled to the piston and the compensation device has the Kompensatortopf.

Gemäße einer weiteren bevorzugten Ausgestaltung weist der Piezo-Aktor einen steuerbaren Piezo-Stapel auf. Der steuerbare Piezo-Stapel stellt in Abhängigkeit eines Steuersignals den Hub zum Betätigen der Düsennadel in einer Schließrichtung oder in einer Öffnungsrichtung bereit.According to another preferred embodiment, the piezo actuator has a controllable piezo stack. The controllable piezo stack provides the stroke for actuating the nozzle needle in a closing direction or in an opening direction as a function of a control signal.

Die Erfindung wird nachfolgend anhand der in den schematischen Figuren der Zeichnungen angegebenen Ausführungsbeispiele näher erläutert. Es zeigen:

Fig. 1
ein schematisches Blockschaltbild eines ersten Ausführungsbeispiels des erfindungsgemäßen Einspritzsystems;
Fig. 2
ein schematisches Blockschaltbild eines zweiten Ausführungsbeispiels des erfindungemäßen Einspritzsystem;
Fig. 3, 4
Detailansichten eines Ausschnitts eines dritten Ausführungsbeispiels des erfindungsgemäßen Einspritzsystems;
Fig. 5
ein schematisches Blockschaltbild eines vierten Ausführungsbeispiels des erfindungsgemäßen Einspritzsystems; und
Fig. 6
ein schematisches Ablaufdiagramm eines bevorzugten Ausführungsbeispiels des erfindungsgemäßen Verfahrens;
The invention will be explained in more detail with reference to the exemplary embodiments indicated in the schematic figures of the drawings. Show it:
Fig. 1
a schematic block diagram of a first embodiment of the injection system according to the invention;
Fig. 2
a schematic block diagram of a second embodiment of erfindungemäßen injection system;
Fig. 3, 4
Detailed views of a section of a third embodiment of the injection system according to the invention;
Fig. 5
a schematic block diagram of a fourth embodiment of the injection system according to the invention; and
Fig. 6
a schematic flow diagram of a preferred embodiment of the method according to the invention;

In allen Figuren sind gleiche bzw. funktionsgleiche Elemente und Vorrichtungen - sofern nichts anderes angegeben ist - mit denselben Bezugszeichen versehen worden.In all figures, identical or functionally identical elements and devices have been provided with the same reference numerals, unless stated otherwise.

Die Ausführungsbeispiele des Einspritzsystems 1 zum Einspritzen von Kraftstoff P unter einem vorbestimmten Kraftstoffdruck gemäß der Figuren 1 - 5 haben gemein, dass das erfindungsgemäße Einspritzsystem 1 einen Aktor 2, 3 und eine Hebelübersetzungsvorrichtung 5 mit einer Ausgleichseinrichtung 6 und einer Hebeleinrichtung 7 aufweist. Dabei stellt der Aktor 2, 3 einen Hub zum Heben einer Düsennadel 4 bereit, welche eine Düse öffnet, in die der Kraftstoff P eingespritzt wird. Die Hebelübersetzungsvorrichtung 5 zur Übersetzung des bereitgestellten Hubes in einem veränderten Hub hat demnach die Ausgleichseinrichtung 6, die mit dem Aktor 2, 3 gekoppelt ist, und die Hebeleinrichtung 7, die mit der Düsennadel 4 gekoppelt ist. Dabei weist die Hebeleinrichtung 7 zumindest zwei symmetrisch angeordnete, einarmige Hebel 8a, 8b auf, welche jeweils mittels einer einzelnen Nadelkopfauflage 9a, 9b einen Düsennadelkopf 10 der Düsennadel 4 beim Heben der Düsennadel 4 kontaktieren. Des Weiteren ist die Ausgleichseinrichtung 6 erfindungsgemäß dazu geeignet, eine unterschiedliche oder inhomogene Kraftwirkung des Aktors 2, 3 auf die einarmigen Hebel 8a, 8b auszugleichen.The embodiments of the injection system 1 for injecting fuel P at a predetermined fuel pressure according to Figures 1 - 5 have in common that the injection system 1 according to the invention comprises an actuator 2, 3 and a lever transmission device 5 with a compensation device 6 and a lever device 7. In this case, the actuator 2, 3 provides a lift for lifting a nozzle needle 4, which opens a nozzle into which the fuel P is injected. The lever translation device 5 for translating the provided stroke in a modified stroke accordingly has the compensation device 6, which is coupled to the actuator 2, 3, and the lever device 7, which is coupled to the nozzle needle 4. In this case, the lever device 7 at least two symmetrically arranged, one-armed lever 8a, 8b, which each contact by means of a single needle head rest 9a, 9b a nozzle needle head 10 of the nozzle needle 4 when lifting the nozzle needle 4. Furthermore, the compensation device 6 according to the invention is suitable for compensating for a different or inhomogeneous force action of the actuator 2, 3 on the one-armed levers 8a, 8b.

Gemäß Fig. 1 und gemäß Fig. 2 weist das Einspritzsystem 1 weiterhin einen hydraulischen Kompensator 14 auf. Der hydraulische Kompensator 14 besitzt einen Kompensatortopf 15 und einen in den Kompensatortopf 15 eingreifenden Kolben 16. Zwischen dem Kompensatortopf 15 und dem Kolben 16 ist ein Zwischenraum 17 ausgebildet, welche mit einem Fluid, insbesondere dem Kraftstoff P, gefüllt ist. Der Zwischenraum 17 ist zum hydraulischen Ausgleich mit einem Ausgleichsvolumen über einen Strömungsspalt 18 gekoppelt.According to Fig. 1 and according to Fig. 2 the injection system 1 further comprises a hydraulic compensator 14. The hydraulic compensator 14 has a Kompensatortopf 15 and an engaging in the Kompensatortopf 15 piston 16. Between the Kompensatortopf 15 and the piston 16, a gap 17 is formed, which is filled with a fluid, in particular the fuel P. The intermediate space 17 is coupled to a compensation volume via a flow gap 18 for hydraulic compensation.

Weiterhin hat das Einspritzsystem 1 gemäß den Fig. 1 und 2 einen Piezo-Aktor 3 als Aktor. Der Piezo-Aktor 3 weist einen steuerbaren Piezo-Stapel 19 auf, welcher in Abhängigkeit eines Steuersignals (nicht gezeigt) den Hub zum Betätigen der Düsennadel 4 in einer Schließrichtung R1 oder in einer Öffnungsrichtung R2 bereitstellt. Zur Abdichtung ist der Piezo-Stapel 19 vorzugsweise mit einem Wellrohr (nicht gezeigt) umgeben. Das Schließen der Düsennadel 4 in der Schließrichtung R1 wird allerdings im Wesentlichen durch eine Feder (nicht gezeigt), welche die nötige Schließkraft erzeugt, vorgenommen, welche dazu geeignet ist, wenn der Piezo-Stapel 19 entladen wird und sich in eine vorbestimmte Ausgangslage zurückzieht.Furthermore, the injection system 1 according to the Fig. 1 and 2 a piezo actuator 3 as an actuator. The piezo-actuator 3 has a controllable piezo-stack 19, which in response to a control signal (not shown) provides the stroke for actuating the nozzle needle 4 in a closing direction R1 or in an opening direction R2. For sealing, the piezo stack 19 is preferably surrounded by a corrugated tube (not shown). The closing of the nozzle needle 4 in the closing direction R1 is, however, substantially by a spring (not shown), which generates the necessary closing force, which is suitable when the piezo-stack 19 is discharged and retracts to a predetermined starting position.

Des Weiteren weist das Einspritzsystem 1 gemäß der Fig. 1 - 5 eine Auflagervorrichtung 21 auf, welche die Hebeleinrichtung 7 lagert. Insbesondere rollen die einarmigen Hebel 8a, 8b auf der Auflagervorrichtung 21 bei der Übertragung des Hubes ab. Weiterhin weist das Einspritzsystem 1 vorzugsweise eine Rückstellfeder 22 zur Rückstellung der Düsennadel 4 auf, welche die Düsennadel 4 mit dem Gehäuse 20 oder mit der Auflagervorrichtung 21 koppelt.Furthermore, the injection system 1 according to the Fig. 1-5 a support device 21, which supports the lever device 7. In particular, the one-armed levers 8a, 8b roll on the support device 21 during the transfer of the stroke. Furthermore, the injection system 1 preferably has a return spring 22 for resetting the nozzle needle 4, which couples the nozzle needle 4 to the housing 20 or to the support device 21.

Gemäß dem ersten Ausführungsbeispiel gemäß Fig. 1 ist eine Bodenplatte 23 des Piezo-Aktors 3 mit dem Kompensatortopf 15 gekoppelt und die Ausgleichseinrichtung 6 weist den Kolben 16 auf. Alternativ kann gemäß dem zweiten Ausführungsbeispiel gemäß Fig. 2 die Bodenplatte 23 des Piezo-Aktors 3 mit dem Kolben 16 gekoppelt sein und die Ausgleichseinrichtung 6 kann einen Kompensatortopf 15 aufweisen.According to the first embodiment according to Fig. 1 a bottom plate 23 of the piezo-actuator 3 is coupled to the Kompensatortopf 15 and the compensation device 6 has the piston 16. Alternatively, according to the second embodiment according to Fig. 2 the bottom plate 23 of the piezo-actuator 3 may be coupled to the piston 16 and the compensation device 6 may have a Kompensatortopf 15.

Die Fig. 3 und 4 zeigen Detailansichten eines Ausschnitts eines dritten Ausführungsbeispieles des erfindungsgemäßen Einspritzsystems 1. Die Fig. 3 und 4 zeigen insbesondere die Hebelübersetzungsvorrichtung 5 mit der Ausgleichseinrichtung 6 und der Hebeleinrichtung 7. Die Hebeleinrichtung 7 weist zwei symmetrisch angeordnete, einarmige Hebel 8a, 8b auf.The Fig. 3 and 4 show detailed views of a section of a third embodiment of the injection system according to the invention 1. The Fig. 3 and 4 in particular show the lever translation device 5 with the balancing device 6 and the lever device 7. The lever device 7 has two symmetrically arranged, one-armed lever 8a, 8b.

Ein einarmiger Hebel 8a, 8b ist im Sinne dieser Anmeldung ein Hebel, welcher zumindest an einer Seite wie eine einarmige Gabel geformt ist. Diese eine Seite ist die Seite des Hebels, mit der er den Düsennadelkopf 10 hebt. Der einarmige Hebel 8a, 8b ist im Wesentlichen U-förmig ausgebildet. Die einarmigen Hebel 8a, 8b kontaktieren den Düsennadelkopf 10 der Düsennadel 4 zum Anheben der Düsennadel 4 jeweils mittels einer einzelnen Nadelkopfauflage 9a, 9b. Durch das Anheben der Düsennadel 4 durch die einarmigen Hebel 8a, 8b wird die Düsennadel 4 gleichsam in einer Drehbewegung aus dem Düsennadelsitz gehoben (nicht gezeigt). Somit treten deutlich reduzierte Reibverluste zwischen dem Düsennadelkopf 10 und dem jeweiligen einarmigen Hebel 8a, 8b auf. Vorzugsweise haben die einarmigen Hebel 8a, 8b eine konvexe Kontur in einem Kontaktbereich zu der Auflagervorrichtung 21, auf welcher die einseitigen Hebel 8a, 8b gelagert sind. Insbesondere sind die einarmigen Hebel 8a, 8b mittels eines Trennspaltes 13 voneinander getrennt. Bezugszeichen 24 in Fig. 4 bezeichnet eine Bohrung für die Düsennadel 4.A one-armed lever 8a, 8b is in the context of this application a lever, which is shaped at least on one side like a one-armed fork. This one side is the side of the lever with which it lifts the nozzle needle head 10. The one-armed lever 8a, 8b is substantially U-shaped. The one-armed levers 8a, 8b contact the nozzle needle head 10 of the nozzle needle 4 for lifting the nozzle needle 4 in each case by means of a single needle head rest 9a, 9b. By lifting the nozzle needle 4 by the one-armed lever 8a, 8b, the nozzle needle 4 is lifted as it were in a rotational movement of the nozzle needle seat (not shown). Thus occur significantly reduced friction losses between the nozzle needle head 10 and the respective one-armed lever 8a, 8b. Preferably, the one-armed levers 8a, 8b have a convex contour in a contact area with the support device 21 on which the one-sided levers 8a, 8b are mounted. In particular, the one-armed levers 8a, 8b are separated from one another by means of a separating gap 13. Reference numeral 24 in FIG Fig. 4 denotes a bore for the nozzle needle. 4

In Fig. 5 ist ein viertes Ausführungsbeispiel des erfindungsgemäßen Einspritzsystems 1 dargestellt. Das vierte Ausführungsbeispiel des Einspritzsystems 1 gemäß Fig. 5 unterscheidet sich insbesondere von dem ersten und zweiten Ausführungsbeispiel gemäß der Fig. 1 und 2 dahingehend, dass als Aktor nicht ein Piezo-Aktor 3, sondern ein Magnet-Aktor 2 verwendet wird. Fig. 5 zeigt einen Magnet-Aktor 2 mit einem Tauchanker 11. Alternativ zur Ausgestaltung mit einem Tauchanker 11 kann auch ein Magnet-Aktor 2 mit einem Flachanker eingesetzt werden.In Fig. 5 a fourth embodiment of the injection system 1 according to the invention is shown. The fourth embodiment of the injection system 1 according to Fig. 5 differs in particular from the first and second embodiments according to the Fig. 1 and 2 to the effect that not a piezoelectric actuator 3, but a magnetic actuator 2 is used as the actuator. Fig. 5 shows a solenoid actuator 2 with a plunger armature 11. Alternatively to the embodiment with a plunger armature 11, a magnet actuator 2 with a flat armature can be used.

Der Magnet-Aktor 2 gemäß Fig. 5 mit dem Tauchanker 11 hat einen Nebenluftspalt 12 zwischen der Spule 27 und dem Tauchanker 11. Die Spule 27 ist mit einem Magnettopf 26 gekoppelt. In einer vertikalen Richtung oberhalb der Spule 27 ist zwischen der Spule 27 und dem Tauchanker 11 ein Arbeitsluftspalt 25 gebildet.The magnet actuator 2 according to Fig. 5 with the plunger armature 11 has a secondary air gap 12 between the coil 27 and the plunger armature 11. The coil 27 is coupled to a magnet pot 26. In a vertical direction above the coil 27, a working air gap 25 is formed between the coil 27 and the plunger armature 11.

Der Hub des Magnet-Aktors 2 wird mittels eines Stössels 28 auf die Ausgleichseinrichtung 6 übertragen. Dabei ist der Magnet-Aktor 2 in einem Niederdruckbereich ND des Einspritzsystems 1 und die Hebelübersetzungsvorrichtung 5 sowie die Düsennadel 4 und potentiell dazwischen gekoppelten Einrichtungen sind in dem Hochdruckbereich HD des Einspritzsystems 1 angeordnet.The stroke of the magnetic actuator 2 is transmitted to the compensating device 6 by means of a plunger 28. In this case, the magnetic actuator 2 is in a low-pressure region ND of the injection system 1 and the lever translation device 5 and the nozzle needle 4 and potentially coupled therebetween devices are arranged in the high-pressure region HD of the injection system 1.

Weiterhin zeigt Fig. 5 einen Hochdruckanschluss 29 zur Zuführung des Kraftstoffes P mit dem vorbestimmten Kraftstoffdruck, der beispielsweise in einem Bereich von 1500 - 2000 bar liegt. Weiterhin zeigt Fig. 5 einen Leckölanschluss 30, der mit dem Hochdruckbereich HD des Einspritzsystems 1 gekoppelt ist.Further shows Fig. 5 a high-pressure port 29 for supplying the fuel P at the predetermined fuel pressure which is in a range of 1,500-2,000 bar, for example. Further shows Fig. 5 a leakage oil port 30 which is coupled to the high-pressure region HD of the injection system 1.

Außerdem zeigt Fig. 5 die Anordnung von Nadelführungen 31 in einem Nadelschaft 32 zur verbesserten Führung der Düsennadel 4. Selbstverständlich können die Nadelführungen 31 auch bei den vorhergehenden Ausführungsbeispielen eingesetzt werden. Des Weiteren schützt eine Kapsel 33 den Magnet-Aktor 2 vor äußeren Einflüssen.Also shows Fig. 5 the arrangement of needle guides 31 in a needle shaft 32 for improved guidance of the nozzle needle 4. Of course, the needle guides 31 can also be used in the previous embodiments. Furthermore, a capsule 33 protects the magnetic actuator 2 from external influences.

Fig. 6 zeigt ein schematisches Ablaufdiagramm eines bevorzugten Ausführungsbeispiels des erfindungsgemäßen Verfahrens zum Herstellen des Einspritzsystems 1 zum Einspritzen von Kraftstoff P unter einem vorbestimmten Kraftstoffdruck. Nachfolgend wird das erfindungsgemäße Verfahren anhand des Blockschaltbildes in Fig. 6 erläutert. Das erfindungsgemäße Verfahren weist folgende Verfahrensschritte S1 und S2 auf:

  • Verfahrensschritt S1:
    • Es wird ein Aktor 2, 3 in einem Gehäuse 20 des Einspritzsystems 1 angeordnet, welcher einen Hub zum Heben einer Düsennadel 4 bereitstellt, welche eine Düse öffnet, in die der Kraftstoff P eingespritzt wird.
  • Verfahrensschritt S2:
    • Der Aktor 2, 3 wird mit einer Hebelübersetzungsvorrichtung 5 zur Übersetzung des bereitgestellten Hubes in einem veränderten, insbesondere vergrößerten Hub gekoppelt. Die Hebelübersetzungsvorrichtung 5 weist eine Ausgleichseinrichtung 6 oder Ausgleichsplatte, welche mit dem Aktor 2, 3 gekoppelt ist, und eine Hebeleinrichtung 7, welche mit der Düsennadel 4 gekoppelt ist, auf. Die Hebeleinrichtung 7 hat zumindest zwei symmetrisch angeordnete, einarmige Hebel 8a, 8b, welche jeweils mittels einer einzelnen Nadelkopfauflage 9a, 9b einen Düsennadelkopf 10 der Düsennadel 4 zum Heben der Düsennadel 4 kontaktieren. Weiterhin ist die Ausgleichseinrichtung 6 dazu geeignet, eine unterschiedliche oder inhomogene Kraftwirkung des Aktors 2, 3 auf die einarmigen Hebel 8a, 8b bei der Übertragung des Hubes auszugleichen.
Fig. 6 shows a schematic flow diagram of a preferred embodiment of the inventive method for manufacturing the injection system 1 for injecting fuel P at a predetermined fuel pressure. The method according to the invention will be described below with reference to the block diagram in Fig. 6 explained. The method according to the invention comprises the following method steps S1 and S2:
  • Process step S1:
    • An actuator 2, 3 is arranged in a housing 20 of the injection system 1, which provides a lift for lifting a nozzle needle 4, which opens a nozzle into which the fuel P is injected.
  • Step S2:
    • The actuator 2, 3 is coupled to a lever translation device 5 for translating the provided stroke in a modified, in particular enlarged stroke. The lever transmission device 5 has a compensating device 6 or compensating plate, which is coupled to the actuator 2, 3, and a lever device 7, which is coupled to the nozzle needle 4, on. The lever device 7 has at least two symmetrically arranged, one-armed levers 8a, 8b which each contact a nozzle needle head 10 of the nozzle needle 4 for lifting the nozzle needle 4 by means of a single needle head support 9a, 9b. Furthermore, the compensation device 6 is adapted to compensate for a different or inhomogeneous force of the actuator 2, 3 on the one-armed lever 8a, 8b in the transfer of the stroke.

Obwohl die vorliegende Erfindung vorstehend anhand der bevorzugten Ausführungsbeispiele beschrieben wurde, ist sie darauf nicht beschränkt, sondern auf vielfältige Art und Weise modifizierbar. Although the present invention has been described above with reference to the preferred embodiments, it is not limited thereto, but modified in many ways.

Claims (10)

  1. Injection system (1) for injecting fuel (P) at a predetermined fuel pressure, having:
    a) an actuator (2, 3) which provides a stroke for lifting a nozzle needle (4) which opens a nozzle into which the fuel (P) is injected,
    b) a lever transmission device (5) for converting the provided stroke into a changed stroke, which lever transmission device has a compensating device (6) coupled to the actuator (2, 3) and has a lever device (7) coupled to the nozzle needle (4),
    c) wherein the lever device (7) has at least two symmetrically arranged, single-armed levers (8a, 8b) which make contact, in each case via a single needle head contact point (9a, 9b), with a nozzle needle head (10) of the nozzle needle (4) during the lifting of the nozzle needle (4),
    d) wherein the compensating device (6) is suitable for compensating a varying exertion of force by the actuator (2, 3) on the single-armed levers (8a, 8b), characterized in that
    e) a hydraulic compensator (14) is coupled between the actuator (2, 3) and the compensating device (6), which hydraulic compensator has a compensator pot (15) and a piston (16) which engages into the compensator pot (15), wherein between the compensator pot (15) and the piston (16) there is formed an intermediate space (17) which is filled with a fluid, in particular the fuel (P), wherein for hydraulic compensation, the intermediate space (17) is coupled via a flow gap (18) to a compensating volume; and
    f) tolerances of the components of the injection system and temperature expansion effects can be compensated through the use of the hydraulic compensator (14).
  2. Injection system according to Claim 1,
    characterized
    in that the actuator (2, 3) is formed as a magnet actuator (2) or as a piezo actuator (3).
  3. Injection system according to Claim 2,
    characterized
    in that the magnet actuator (2) has a flat armature or a plunger armature (11).
  4. Injection system according to Claim 3,
    characterized
    in that the magnet actuator (2) with the plunger armature (11) has a secondary air gap (12).
  5. Injection system according to Claim 3,
    characterized
    in that the magnet actuator (2) with the flat armature has a torus coil or a toroid coil, wherein the flat armature has in particular a square cross section.
  6. Injection system according to Claim 1 or one of Claims 2 to 5,
    characterized
    in that the single-armed levers (8a, 8b) are separated from one another by a parting gap (13).
  7. Injection system according to Claim 1,
    characterized
    in that a base plate (23) of the piezo actuator (3) is coupled to the compensator pot (15) and the compensating device (6) has the piston (16).
  8. Injection system according to Claim 1,
    characterized
    in that a base plate (23) of the piezo actuator (3) is coupled to the piston (16) and the compensating device (6) has the compensator pot (15).
  9. Injection system according to Claim 2 or one or more of Claims 3 to 8,
    characterized
    in that the piezo actuator (3) has a controllable piezo stack (19) which, as a function of a control signal, provides the stroke for actuating the nozzle needle (4) in a closing direction (R1) or in an opening direction (R2).
  10. Method for producing an injection system (1) for injecting fuel (P) at a predetermined fuel pressure, having the steps:
    a) arranging an actuator (2, 3) in a housing (20) of the injection system (1), which actuator provides a stroke for lifting a nozzle needle (4) which opens a nozzle into which the fuel (P) is injected;
    b) coupling the actuator (2, 3) to a lever transmission device (5) for converting the provided stroke into a changed, in particular increased stroke, which lever transmission device has a compensating device (6) coupled to the actuator (2, 3) and has a lever device (7) coupled to the nozzle needle (4), wherein the lever device (7) has at least two symmetrically arranged, single-armed levers (8a, 8b) which make contact, in each case via a single needle head contact point (9a, 9b), with a nozzle needle head (10) of the nozzle needle (4) for the lifting of the nozzle needle (4), wherein the compensating device (6) is suitable for compensating a varying exertion of force by the actuator (2, 3) on the single-armed levers (8a, 8b), characterized by the following steps:
    c) coupling a hydraulic compensator (14) between the actuator (2, 3) and the compensating device (6), which hydraulic compensator has a compensator pot (15) and a piston (16) which engages into the compensator pot (15), wherein between the compensator pot (15) and the piston (16) there is formed an intermediate space (17) which is filled with a fluid, in particular the fuel (P), wherein for hydraulic compensation, the intermediate space (17) is coupled via a flow gap (18) to a compensating volume, such that tolerances of the components of the injection system and temperature expansion effects can be compensated.
EP06805998A 2006-07-07 2006-10-02 Injection system and method for producing an injection system Active EP2041425B1 (en)

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DE102006031567A DE102006031567A1 (en) 2006-07-07 2006-07-07 Injection system and method for manufacturing an injection system
PCT/EP2006/009554 WO2008003347A1 (en) 2006-07-07 2006-10-02 Injection system and method for producing an injection system

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EP (1) EP2041425B1 (en)
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DE102016101880B4 (en) 2015-02-17 2021-07-15 Denso Corporation Fuel injector

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US20090200406A1 (en) 2009-08-13
EP2041425A1 (en) 2009-04-01
DE102006031567A1 (en) 2008-01-10
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CN101479465A (en) 2009-07-08
US8807450B2 (en) 2014-08-19
ATE555300T1 (en) 2012-05-15
WO2008003347A1 (en) 2008-01-10

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