EP1963659B1 - Fuel injector having a directly actuable injection valve element - Google Patents

Fuel injector having a directly actuable injection valve element Download PDF

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Publication number
EP1963659B1
EP1963659B1 EP06807287.5A EP06807287A EP1963659B1 EP 1963659 B1 EP1963659 B1 EP 1963659B1 EP 06807287 A EP06807287 A EP 06807287A EP 1963659 B1 EP1963659 B1 EP 1963659B1
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EP
European Patent Office
Prior art keywords
section
space
nozzle needle
fuel injector
coupler
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EP06807287.5A
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German (de)
French (fr)
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EP1963659A1 (en
Inventor
Wolfgang Stoecklein
Thomas Pauer
Christian Kuhnert
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Robert Bosch GmbH
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Robert Bosch 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • Such a fuel injector is out EP 1 079 095 A2 in which an actuator arranged in an injector body is connected to an actuator-side coupler piston which depressurizes or pressurizes a coupler space and in which a nozzle needle is exposed to a control space.
  • an intermediate disc is arranged, in which a throttle channel is formed, via which the coupler space and the control chamber are hydraulically connected.
  • the throttle channel has a leading into the coupler space first conical portion and a leading into the control chamber second conical portion. Between the two conical sections, which have a different flow cross-section, a substantially cylindrical third section is formed.

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

Description

Die Erfindung betrifft einen Kraftstoffinjektor für Brennkraftmaschinen nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injector for internal combustion engines according to the preamble of claim 1.

Stand der TechnikState of the art

Ein derartiger Kraftstoffinjektor ist aus EP 1 079 095 A2 bekannt, bei dem ein in einem Injektorkörper angeordneter Aktor mit einem aktorseitigen Kopplerkolben verbunden ist, der einen Kopplerraum druckentlastet oder mit Druck beaufschlagt, und bei dem eine Düsennadel einem Steuerraum ausgesetzt ist. Zwischen dem Kopplerraum und dem Steuerraum ist eine Zwischenscheibe angeordnet, in der ein Drosselkanal ausgebildet ist, über den der Kopplerraum und der Steuerraum hydraulisch verbunden sind. Der Drosselkanal weist einen in den Kopplerraum führenden ersten kegelförmigen Abschnitt und einen in den Steuerraum führenden zweiten kegelförmigen Abschnitt auf. Zwischen den beiden kegelförmigen Abschnitten, die einen unterschiedlichen Strömungsquerschnitt aufweisen, ist ein im Wesentlichen zylindrischer dritte Abschnitt ausgebildet.Such a fuel injector is out EP 1 079 095 A2 in which an actuator arranged in an injector body is connected to an actuator-side coupler piston which depressurizes or pressurizes a coupler space and in which a nozzle needle is exposed to a control space. Between the coupler space and the control chamber, an intermediate disc is arranged, in which a throttle channel is formed, via which the coupler space and the control chamber are hydraulically connected. The throttle channel has a leading into the coupler space first conical portion and a leading into the control chamber second conical portion. Between the two conical sections, which have a different flow cross-section, a substantially cylindrical third section is formed.

Aus der nachveröffentlichten EP 1 621 759 A1 ist ein Kraftstoffinjektor mit direkt angesteuerter Düsennadel bekannt, bei dem ein Kopplerraum und ein Steuerraum ebenfalls mit einem Drosselkanal hydraulisch verbunden sind. Der Drosselkanal weist hierbei vier verschiedene Abschnitte auf, wobei die in den Kopplerraum und in den Steuerraum weisenden Abschnitte unterschiedliche Strömungquerschnitt aufweisen.From the post-published EP 1 621 759 A1 a fuel injector with directly controlled nozzle needle is known in which a coupler chamber and a control chamber are also hydraulically connected to a throttle channel. The throttle channel in this case has four different sections, wherein the sections pointing into the coupler chamber and into the control chamber have different flow cross-sections.

Ein weiterer Kraftstoffinjektor mit direkt betätigbarem Einspritzventilglied und mit einer einstufigen Übersetzung des Aktorhubs mit einem ziehenden Aktor zum Öffnen der Düsennadel wird in DE 10 2004 005 452 A1 beschrieben. Dabei wirkt ein mittels eines Aktors betätigter aktorseitige Koppierkolben auf einen Kopplerraum und ein mit einer Düsennadel verbundener Kopplerkolben auf einen Steuerraum ein. Der Kopplerraum und der Steuerraum sind über einen Kanal mit gleichmäßigem Durchmesser hydraulisch verbunden. Der Kanal ist dabei in eine Zwischenscheibe eingebracht, die zwischen einem Injektorkörper und einem Düsenkörper angeordnet ist.Another fuel injector with directly actuatable injection valve member and with a single-stage translation of Aktorhubs with a pulling actuator to open the nozzle needle is in DE 10 2004 005 452 A1 described. In this case, an actuator-side coupling piston actuated by means of an actuator acts on a coupler space and a coupler piston connected to a nozzle needle acts on a control space. The coupler chamber and the control chamber are hydraulically connected via a channel of uniform diameter. The channel is in one Inserted intermediate disc, which is arranged between an injector body and a nozzle body.

Bei Betätigung des Aktors kommt es zu hohen Beschleunigungen und am Endhub des Aktors zu entsprechenden Schwingungen des Aktors, die über die hydraulischen Räume auf die Düsennadel übertragen werden, wodurch die Düsennadel mitschwingt. Diese Schwingungen führen zu Einspritzmengenschwankungen, da sich der Drosselquerschnitt der Düsennadel am Düsennadeldichtsitz verändert.Upon actuation of the actuator, high accelerations occur and, at the final stroke of the actuator, corresponding oscillations of the actuator are transmitted to the nozzle needle via the hydraulic chambers, as a result of which the nozzle needle resonates. These vibrations lead to injection quantity fluctuations, since the throttle cross-section of the nozzle needle changes at the nozzle needle sealing seat.

Aufgabe der vorliegenden Erfindung ist es, einen kompakt aufgebauten Kraftstoffinjektor zu schaffen, bei dem die Übertragung der Schwingungen des Aktorhubs auf die Düsennadel unterdrückt werden und trotzdem ein schnelles Öffnen und Schließen der Düsennadel erhalten bleibt.Object of the present invention is to provide a compact fuel injector, in which the transmission of the vibrations of Aktorhubs be suppressed to the nozzle needle and still maintain a rapid opening and closing of the nozzle needle.

Offenbarung der ErfindungDisclosure of the invention

Die Aufgabe der Erfindung wird mit einem Kraftstoffinjektor mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Die zwischen dem Kopplerraum des Aktors und dem Steuerraum der Düsennadel angeordnete hydraulische Drossel bewirkt, dass die Schwingungen des Aktors bei der Übersetzung des Aktorhubs auf den Düsennadelhub unterdrückt bzw. schnell gedämpft werden. Dies wird erreicht, indem dem ersten Abschnitt zum Kopplerraum hin ein dritter Abschnitt und dem zweiten Abschnitt zum Steuerraum hin ein vierter Abschnitt vorgelagert ist, und indem diese beiden Abschnitte im Wesentlichen den gleichen Strömungsquerschnitt besitzen, der wiederum größer ist als der größere Strömungsquerschnitt des zweiten Abschnitts.The object of the invention is achieved with a fuel injector having the characterizing features of claim 1. The arranged between the coupler space of the actuator and the control chamber of the nozzle needle hydraulic throttle causes the vibrations of the actuator are suppressed in the translation of Aktorhubs on the Düsennadelhub or quickly damped. This is achieved by a third portion and the second portion to the control chamber towards a fourth portion is upstream of the first portion to the coupler space, and in that these two portions have substantially the same flow cross section, which in turn is greater than the larger flow cross section of the second portion ,

Vorteilhafte Weiterbildungen der Erfindung sind durch die Maßnahmen der Unteransprüche möglich.Advantageous developments of the invention are possible by the measures of the subclaims.

Vorteilhaft ist, wenn der Kanal außermittig bezogen auf die Mittelachse des Steuerraums in der Zwischenscheibe angeordnet ist. Eine besonders wirkungsvolle Dämpfung und eine schnelle hydraulische Übertragung zwischen Kopplerraum und Steuerraum wird erzielt, wenn das Verhältnis des kleineren Strömungsquerschnitts des ersten Abschnitts der Drossel zur Querschnittsfläche des Steuerraums zwischen 0,05 und 0,1, vorzugsweise zwischen 0,075 bis 0,08 liegt. Vorteilhaft ist außerdem, wenn die Zwischenscheibe mindestens einen Verbindungskanal aufweist, der einen mit dem Hochdruckanschluss verbundenen Hochdruckraum mit dem Düsennadelraum hydraulische verbindet, wobei in der Zwischenscheibe mehrere um die Mittelachse des Steuerraums kreisförmig angeordnete Verbindungskanäle vorgesehen sind.It is advantageous if the channel is arranged off-center in relation to the central axis of the control chamber in the intermediate disc. A particularly effective damping and rapid hydraulic transmission between the coupler space and the control chamber is achieved when the ratio of the smaller flow cross section of the first portion of the throttle to the cross sectional area of the Control space between 0.05 and 0.1, preferably between 0.075 to 0.08. It is also advantageous if the intermediate disc has at least one connecting channel, which connects a high pressure connected to the high-pressure connection with the nozzle needle hydraulic space, wherein in the intermediate disc more circularly arranged around the central axis of the control chamber connecting channels are provided.

Ausführungsbeispielembodiment

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description.

Es zeigen:

Figur 1
ein Schnittdarstellung eines brennraumseitigen Teiles eines erfindungsgemäßen Kraftstoffinjektors,
Figur 2
einen Schnittdurchstellung einer Zwischenplatte und
Figur 3
einen vergrößerten Ausschnitt X der Zwischenplatte in Figur 2.
Show it:
FIG. 1
a sectional view of a combustion chamber-side part of a fuel injector according to the invention,
FIG. 2
a Schnittdurchstellung an intermediate plate and
FIG. 3
an enlarged section X of the intermediate plate in FIG. 2 ,

Der in Figur 1 dargestellte Kraftstoffinjektor weist ein Injektorgehäuse 10 mit einem Einspritzventilglied auf, das mit einem Düsenkörper 12 in einen Brennraum einer Brennkraftmaschine ragt. Im Düsenkörper 12 ist eine Düsennadel 13 axial verschiebbar geführt. Am Düsenkörper 12 ist an der Spitze der Düsennadel 1 ein Düsennadeldichtsitz 14 ausgebildet, dem in Einspritzrichtung im Düsenkörper 12 ausgebildete und in den Brennraum hinein ragende Einspritzdüsen 15 nachgeordnet sind. Dem Düsennadeldichtsitz 14 ist im Einspritzventilglied in Einspritzrichtung ein Düsennadeldruckraum 16, vorgelagert, dem ein an der Düsennadel 13 ausgebildete düsennadelseitige Druckschulter 17 ausgesetzt ist.The in FIG. 1 shown fuel injector has an injector 10 with an injection valve member which projects with a nozzle body 12 into a combustion chamber of an internal combustion engine. In the nozzle body 12, a nozzle needle 13 is guided axially displaceable. On the nozzle body 12, a nozzle needle sealing seat 14 is formed at the tip of the nozzle needle 1, which are arranged in the injection direction in the nozzle body 12 and projecting into the combustion chamber injectors 15 downstream. The nozzle needle sealing seat 14 is preceded by a nozzle needle pressure chamber 16 in the injection valve member in the injection direction, to which a nozzle needle-side pressure shoulder 17 formed on the nozzle needle 13 is exposed.

Das Injektorgehäuse 10 weist einen Druckraum 18 auf, der mit einem Anschluss 19 an ein nicht dargestelltes Hochdrucksystem, beispielsweise an ein Common-Rail-System einer Dieseleinspritzeinrichtung angeschlossen ist. Im Hochdruckraum 18 ist ein Piezo-Aktor 20 angeordnet, der mit einem aktorseitigen Kopplerkolben 21 fest verbunden ist. Der aktorseitigen Kopplerkolben 21 weist einen Führungsabschnitt 22 und einen ringförmigen Bund 23 auf. Am Führungsabschnitt 22 ist eine erste Schieberhülse 30 axial verschiebbar geführt, an der eine Druckfeder 25 angreift, die sich am Bund 23 des aktorseitigen Kopplerkolbens 21 abstützt. Damit der relativ lange Piezo-Aktor 20 bei seiner Längenänderung den Kopplerkolben 21 im Hochdruckraum 18 nicht verkantet, ist beispielsweise die Schieberhülse 30 zusätzlich mit nicht dargestellten Führungsflächen an einer Führungsbohrung 26 in axialer Richtung innerhalb des Injektorkörper 10 beführt.The injector housing 10 has a pressure chamber 18 which is connected by a connection 19 to a high-pressure system (not shown), for example to a common-rail system of a diesel injection device. In the high-pressure chamber 18, a piezoelectric actuator 20 is arranged, which is fixedly connected to an actuator-side coupler piston 21. The actuator-side coupler piston 21 has a guide portion 22 and an annular collar 23. At the guide portion 22, a first slide sleeve 30 is guided axially displaceable, on which a compression spring 25 engages, which is supported on the collar 23 of the actuator-side coupler piston 21. Thus, the relatively long piezoelectric actuator 20 does not tilt the coupler piston 21 in the high-pressure chamber 18 in its change in length, for example, the slide sleeve 30 additionally guides with not shown guide surfaces on a guide bore 26 in the axial direction within the injector body 10.

Zwischen dem Injektorkörper 10 und dem Düsenkörper 12 ist eine Zwischenplatte 40 angeordnet, die mittels einer Spannmutter 41 hydraulisch dicht verspannt ist. Die Zwischenplatte 40 weist beispielsweise mindestens zwei Verbindungskanäle 42 auf, über die der Hochdruckraum 18 mit dem Düsennadeldruckraum 16 hydraulisch verbunden ist. Die erste Schieberhülse 30 drückt mit einer Dichtkante 31 gegen eine an der Drosselplatte 40 ausgebildete aktorseitige Stirnfläche 43. Dadurch bildet sich innerhalb der ersten Schieberhülse 30 ein Kopplerraum 32 aus, dem der aktorseitige Kopplerkolben 21 mit einer Druckfläche 27 ausgesetzt ist.Between the injector body 10 and the nozzle body 12, an intermediate plate 40 is arranged, which is clamped by means of a clamping nut 41 hydraulically tight. The intermediate plate 40 has, for example, at least two connecting channels 42, via which the high-pressure chamber 18 is hydraulically connected to the nozzle needle pressure chamber 16. The first sliding sleeve 30 presses with a sealing edge 31 against a formed on the throttle plate 40 actuator-side end face 43. This forms within the first Slider sleeve 30 from a coupler space 32 from which the actuator-side coupler piston 21 is exposed to a pressure surface 27.

An der Düsennadel 13 ist ein düsennadelseitiger Kopplerkolben 34 ausgebildet, an dem eine weitere Schieberhülse 36 axial verschiebbar beführt ist. Die weitere Schiebehülse 36 drückt mit einer weiteren Dichtkante 37 gegen eine düsennadelseitige Stirnfläche 44 der Zwischenplatte 40. Die Druckkraft für die weitere Dichtkante 37 wird dabei mittels einer weiteren Druckfeder 28 aufgebracht.At the nozzle needle 13, a nozzle needle-side coupler piston 34 is formed on which a further slide sleeve 36 is axially displaceable. The further sliding sleeve 36 presses with a further sealing edge 37 against a nozzle needle-side end face 44 of the intermediate plate 40. The pressure force for the further sealing edge 37 is applied by means of a further compression spring 28.

Innerhalb der weiteren Schieberhülse 36 bildet sich ein Steuerraum 38 aus, dem der düsennadelseitige Kopplerkolben 34 mit einer Druckfläche 39 ausgesetzt ist. Um eine Hubübersetzung vom aktorseitigen Kopplerkolben 21 auf den düsennadelseitigen Kopplerkolben 34 von größer eins (>1) zu realisieren, ist es notwendig, dass der Durchmesser des aktorseitigen Kopplerkolbens 21 bzw. der Druckfläche 27 größer ist als der Durchmesser des düsennadelseitigen Kopplerkolbens 34 bzw. der weiteren Druckfläche 39.Within the further slide sleeve 36, a control chamber 38 is formed, to which the nozzle needle-side coupler piston 34 is exposed with a pressure surface 39. In order to realize a stroke ratio of the actuator-side coupler piston 21 on the nozzle needle-side coupler piston 34 of greater than one (> 1), it is necessary that the diameter of the actuator-side coupler piston 21 and the pressure surface 27 is greater than the diameter of the nozzle needle-side coupler piston 34 and further pressure surface 39.

Durch die Drosselplatte 40 führt eine Kanal 50, der den Kopplerraum 32 mit dem Steuerraum 38 hydraulisch verbindet. Der Kanal 50, der außermittig von der Mittelachse 49 des Steuerraums 38 in der Zwischenplatte 40 angeordnet ist, weist eine hydraulische Drossel 51 auf (Figur 2).Through the throttle plate 40 performs a channel 50 which connects the coupler chamber 32 with the control chamber 38 hydraulically. The channel 50, which is arranged off-center of the central axis 49 of the control chamber 38 in the intermediate plate 40, has a hydraulic throttle 51 ( FIG. 2 ).

Der Kopplerraum 32 und der Steuerraum 38 wirken als Übersetzungsräume, indem der Hub des aktorseitigen Kopplerkolben 21 aufgrund der größeren Druckfläche 27 gegenüber der kleineren Druckfläche 39 des düsennadelseitigen Kopplerkolbens 34 höher übersetzt wird. Der zur Übersetzung dienende Kraftstoff als hydraulisches Medium wird dabei über den Kanal 50 mit der Drossel 51 übertragen. Um sowohl eine schnelle als auch dämpfende Übertragung des Kraftstoffes zu gewährleisten, weist gemäß Figur 3 die Drossel 51 einen ersten Abschnitt 52 mit einem kleinen Strömungsquerschnitt und einen zweiten Abschnitt 53 mit einem größeren Strömungsquerschnitt auf, wobei der erste Abschnitt 52 mit dem kleinen Strömungsquerschnitt dem Kopplerraum 32 und der zweite Abschnitt 53 mit dem größeren Strömungsquerschnitt dem Steuerraum 38 zugewandt ist. Außerdem ist dem ersten Abschnitt 52 zum Kopplerraum 32 hin ein dritter Abschnitt 54 und dem zweiten Abschnitt 53 zum Steuerraum 38 hin ein vierter Abschnitt 55 vorgelagert. Die Abschnitt 54 und 55 besitzen dabei im Wesentlichen den gleichen Strömungsquerschnitt, der wiederum größer ist als der größere Strömungsquerschnitt des zweiten Abschnitts 53. Ferner ist zwischen dem dem Steuerraum 38 zugeordneten Abschnitt 55 und dem zweiten Abschnitt 53 der Drossel 51 ein zum zweiten Abschnitt 53 hin sich verjüngender, konisch verlaufender Übergang 56 ausgebildet.The coupler space 32 and the control chamber 38 act as translation spaces by the stroke of the actuator-side coupler piston 21 is translated higher due to the larger pressure surface 27 against the smaller pressure surface 39 of the nozzle needle-side coupler piston 34. The serving for translation fuel as a hydraulic medium is transmitted via the channel 50 with the throttle 51. In order to ensure both a fast and a damping transfer of the fuel, according to FIG. 3 the throttle 51 has a first section 52 with a small flow cross section and a second section 53 with a larger flow cross section, the first section 52 with the small flow cross section facing the coupler chamber 32 and the second section 53 with the larger flow cross section facing the control chamber 38. In addition, the first portion 52 to the coupler space 32 toward a third portion 54 and the second portion 53 to the control chamber 38 towards a fourth section 55 upstream. The sections 54 and 55 have substantially the same Flow cross-section, which in turn is greater than the larger flow cross-section of the second portion 53. Further, between the control chamber 38 associated portion 55 and the second portion 53 of the throttle 51 to the second portion 53 toward tapering, conical transition 56 is formed.

Entscheiden für eine wirkungsvolle Schwingungsdämpfung ist ferner das Verhältnis des Durchmessers bzw. der Querschnittfläche der Drossel 51 und der Durchmesser bzw. die Querschnittsfläche des Steuerraums 38. Es wurde gefunden, dass die Schwingung der Düsennadel 13 aufgrund der Übersetzung des Aktorhubs wirkungsvoll unterdrückt wird, wenn das Verhältnis der Fläche AD des kleineren Strömungsquerschnitts des ersten Abschnitts 52 der Drossel 51 zur Querschnittsfläche AK des Steuerraums 38 zwischen 0,05 und 0,1, vorzugsweise bei 0,075 bis 0,08 liegt.Decide for an effective vibration damping is also the ratio of the diameter or the cross-sectional area of the throttle 51 and the diameter or the cross-sectional area of the control chamber 38. It has been found that the vibration of the nozzle needle 13 is effectively suppressed due to the translation of Aktorhubs when the Ratio of the area AD of the smaller flow cross-section of the first portion 52 of the throttle 51 to the cross-sectional area AK of the control chamber 38 between 0.05 and 0.1, preferably 0.075 to 0.08.

Die Einspritzung mit dem Kraftstoffinjektor wird mit einem ziehenden Piezo-Aktor 20 eingeleitet. Dazu liegt im geschlossenen Zustand der Einspritzdüsen 15 am Piezo-Aktor 20 eine Spannung an. Zum Einleiten der Einspritzung wird die Spannung reduziert oder auf Null geschaltet, sodass sich der Piezo-Aktor 20 verkürzt und dadurch ein ziehender Hub mit dem aktorseitigen Kopplerkolben 21 eingeleitet wird. Diese Art der Ansteuerung bei Kraftstoffinjektoren wird auch als inverse Ansteuerung des Piezo-Aktors 20 bezeichnet.The injection with the fuel injector is initiated with a pulling piezoelectric actuator 20. For this purpose, in the closed state of the injectors 15 at the piezo-actuator 20 to a voltage. To initiate the injection, the voltage is reduced or switched to zero, so that the piezoelectric actuator 20 is shortened, thereby initiating a pulling stroke with the actuator-side coupler piston 21. This type of control in fuel injectors is also referred to as inverse control of the piezo actuator 20.

Der vom aktorseitigen Kopplerkolben 21 realisierte ziehende Hub fühlt zu einer Vergrößerung des Kopplerraums 32, wodurch der Druck im Kopplerraum 32 unterhalb des Rail-Drucks bzw. Systemdrucks abfällt. Der abfallende Druck im Kopplerraum 32 wird über den Kanal 50 mit der Drossel 51 auf den Steuerraum 38 übertragen, wodurch der im Düsennadeldruckraum 16 auf die Druckschalter 17 wirkende Rail-Druck höher ist als der auf die Druckfläche 39 wirkende Druck im Steuerraum 38. Dadurch, dass die Druckfläche 39 kleiner ist als die Druckfläche 27 wird die Düsennadel 13 mit einem größeren Hub als der Hub des Piezo-Aktors 20 vom Düsennadeldichtsitz 14 abgehoben. Durch das Abheben der Düsennadel 13 vom Düsennadeldichtsitz 14 werden die Einspritzdüsen 15 freigegeben, sodass über die Einspritzdüsen 15 der Kraftstoff mit dem im Düsennadeldruckraum 16 anliegenden Rail-Druck bzw. Systemdruck eingespritzt wird.The pulling stroke realized by the actuator-side coupler piston 21 senses an enlargement of the coupler space 32, as a result of which the pressure in the coupler space 32 drops below the rail pressure or system pressure. The falling pressure in the coupler chamber 32 is transmitted via the channel 50 with the throttle 51 to the control chamber 38, whereby the pressure acting in the nozzle needle chamber 16 on the pressure switch 17 rail pressure is higher than the pressure acting on the pressure surface 39 pressure in the control chamber 38. that the pressure surface 39 is smaller than the pressure surface 27, the nozzle needle 13 is lifted from the nozzle needle sealing seat 14 with a larger stroke than the stroke of the piezo-actuator 20. By lifting the nozzle needle 13 from Düsennadeldichtsitz 14, the injectors 15 are released so that the fuel is injected via the injectors 15 with the voltage applied in the nozzle needle pressure chamber 16 rail pressure or system pressure.

Zum Schließen des Dichtsitzes 14 wird der Piezo-Aktor 20 mit einer Spannung beaufschlagt, die eine Längenausdehnung des Piezo-Aktors 20 bewirkt, wodurch der aktorseitige Kopplerkolben 21 in den Kopplerraum 32 drückt und dort den Druck erhöht. Die Druckerhöhung wird über den Kanal 50 und die Drossel 51 in den Steuerraum 38 übertragen, der dort auf die weitere Druckfläche 39 des düsennadelseitigen Kopplerkolbens 35 wirkt. Dadurch wird die Düsennadel 13 unterstützt durch die Druckfeder 28 wieder in den Düsennadeldichtsitz 14 gestellt.To close the sealing seat 14, the piezo-actuator 20 is subjected to a voltage which causes a longitudinal expansion of the piezo-actuator 20, whereby the actuator-side coupler piston 21 presses in the coupler chamber 32 and there increases the pressure. The pressure increase is transmitted via the channel 50 and the throttle 51 in the control chamber 38, which acts there on the further pressure surface 39 of the nozzle needle-side coupler piston 35. As a result, the nozzle needle 13 is supported by the compression spring 28 again in the nozzle needle sealing seat 14.

Claims (6)

  1. Fuel injector for an internal combustion engine having an injection valve member which has a nozzle needle (13) which is guided axially movably in a nozzle body (12) and is connected to a nozzle needle-side coupler piston (34) which acts on a control space (38), and having an actuator (20) which is arranged in an injector body (10) and is connected to an actuator-side coupler piston (21) which relieves or pressurizes a coupler space (32), an intermediate disc (40) being arranged between the injector body (10) and the nozzle body (12), which intermediate disc (40) has a channel (50), to which the coupler space (32) and the control space (38) are connected hydraulically, and the nozzle needle (13) being raised up from a nozzle needle sealing seat (14) depending on the pressure in the control space (38) and, as a result, the fuel which prevails in a nozzle needle pressure space (16) and is loaded with system pressure being injected, the channel (40) containing a hydraulic throttle (51) which has at least two sections (52, 53) with different flow cross sections, and the first section (52) with the smaller flow cross section facing the coupler space (32) and the second section (53) with the larger flow cross section facing the control space (38), characterized in that a third section (54) is positioned upstream of the first section (52) towards the coupler space (32), and a fourth section (55) is positioned upstream of the second section (53) towards the control space (38), and in that the third section (54) and the fourth section (55) have substantially the same flow cross section which is in turn larger than the larger flow cross section of the second section (53).
  2. Fuel injector according to Claim 1, characterized in that a conically running transition (56) which tapers towards the second section (53) is configured between the fourth section (55) which is assigned to the control space (38) and the second section (53) of the throttle (51).
  3. Fuel injector according to Claim 1, characterized in that the channel (40) is arranged eccentrically in the intermediate disc (40) in relation to the centre axis of the control space (38).
  4. Fuel injector according to Claim 1, characterized in that the smaller flow cross section of the section (52) has an area AD and the control space (38) has a cross-sectional area AS, and in that the ratio of the surface AD to the cross-sectional area AS lies between 0.05 and 0.1, preferably at from 0.075 to 0.08.
  5. Fuel injector according to Claim 1, characterized in that the intermediate disc (40) has at least one connecting channel (45) which connects a high pressure space (17) to the nozzle needle space (16) hydraulically.
  6. Fuel injector according to Claim 5, characterized in that a plurality of connecting channels (45) which are arranged circularly around the centre axis of the control space (38) are provided in the intermediate disc (40).
EP06807287.5A 2005-12-12 2006-10-16 Fuel injector having a directly actuable injection valve element Not-in-force EP1963659B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005059169A DE102005059169A1 (en) 2005-12-12 2005-12-12 Fuel injector with directly actuatable injection valve member
PCT/EP2006/067428 WO2007068518A1 (en) 2005-12-12 2006-10-16 Fuel injector having a directly actuable injection valve element

Publications (2)

Publication Number Publication Date
EP1963659A1 EP1963659A1 (en) 2008-09-03
EP1963659B1 true EP1963659B1 (en) 2015-12-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06807287.5A Not-in-force EP1963659B1 (en) 2005-12-12 2006-10-16 Fuel injector having a directly actuable injection valve element

Country Status (6)

Country Link
US (1) US7926737B2 (en)
EP (1) EP1963659B1 (en)
JP (1) JP4898830B2 (en)
CN (1) CN101331312B (en)
DE (1) DE102005059169A1 (en)
WO (1) WO2007068518A1 (en)

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Also Published As

Publication number Publication date
EP1963659A1 (en) 2008-09-03
CN101331312B (en) 2011-05-25
CN101331312A (en) 2008-12-24
WO2007068518A1 (en) 2007-06-21
JP4898830B2 (en) 2012-03-21
US20080302887A1 (en) 2008-12-11
US7926737B2 (en) 2011-04-19
DE102005059169A1 (en) 2007-06-14
JP2009518586A (en) 2009-05-07

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