EP1651859A1 - Hydraulic coupler and fuel injection valve - Google Patents

Hydraulic coupler and fuel injection valve

Info

Publication number
EP1651859A1
EP1651859A1 EP04738650A EP04738650A EP1651859A1 EP 1651859 A1 EP1651859 A1 EP 1651859A1 EP 04738650 A EP04738650 A EP 04738650A EP 04738650 A EP04738650 A EP 04738650A EP 1651859 A1 EP1651859 A1 EP 1651859A1
Authority
EP
European Patent Office
Prior art keywords
booster
piston
coupler according
booster piston
coupler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04738650A
Other languages
German (de)
French (fr)
Other versions
EP1651859B1 (en
Inventor
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1651859A1 publication Critical patent/EP1651859A1/en
Application granted granted Critical
Publication of EP1651859B1 publication Critical patent/EP1651859B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • 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
    • F02M2200/706—Valves for filling or emptying hydraulic chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow

Definitions

  • the invention relates to a hydraulic coupler for a fuel injection valve, with a booster piston that can be coupled to an actuator, in particular a piezo actuator, and with a further booster piston that can be coupled with a nozzle needle, a lifetime filling of a hydraulic medium being arranged between the two booster pistons to hydraulically couple the two booster pistons together.
  • the invention also relates to a fuel injection valve.
  • Hydraulic couplers are used to compensate for temperature differences between the actuator and the nozzle needle.
  • service life filling is intended to clarify that the coupler is filled with hydraulic medium before commissioning and that this filling is no longer replaced or supplemented during the entire service life.
  • high demands must be placed on tightness.
  • Conventional couplers are often of complex construction and / or can only be filled with great effort.
  • the object of the invention is therefore to provide a hydraulic coupler and a fuel injection valve of the type described at the outset, which are simple in construction and can be produced cost-effectively. representation Furthermore, the coupler to be created should be able to be filled with little effort.
  • the task is in a hydraulic coupler for a fuel injection valve, with a booster piston that can be coupled to an actuator, in particular with a piezo actuator, and with a further booster piston that can be coupled with a nozzle needle, a lifetime filling of a hydraulic medium between the two booster pistons is arranged in order to hydraulically couple the two booster pistons to one another, solved in that one end of one of the booster pistons is guided in one end of the other booster piston, and in that a booster chamber formed between the end faces of the one booster piston and the other booster piston also an additional receiving space for hydraulic medium is connected, which is sealed by a spring sealing element.
  • the spring sealing element serves on the one hand to seal the additional receiving space for hydraulic medium.
  • the preload for the filling pressure can be provided by the spring sealing element.
  • a preferred exemplary embodiment of the coupler is characterized in that a connecting channel is formed in the one booster piston, which connects the booster space to the additional receiving space for hydraulic medium. This considerably simplifies the construction of the coupler.
  • Another preferred exemplary embodiment of the coupler is characterized in that the connecting channel is equipped with a throttle.
  • the throttle enables the booster chamber to be filled after an injection and at the same time prevents a large volume flow of the hydraulic medium from escaping from the booster chamber in an uncontrolled manner.
  • Another preferred exemplary embodiment of the coupler is characterized in that the throttle is rounded on one side in the filling direction. This further simplifies filling the translator room.
  • the connecting channel comprises a through hole which runs in the longitudinal direction of the one booster piston. Through the through hole, the coupler can be filled easily before the first start-up.
  • Another preferred exemplary embodiment of the coupler is characterized in that the through hole on the side of the one booster piston facing away from the booster chamber is closed by a sealing element.
  • the sealing element can, for example, be a ball that is pressed against an associated seat by a screw.
  • Another preferred exemplary embodiment of the coupler is characterized in that the additional receiving space for hydraulic medium from. an annular space is formed, which is arranged radially outside the one piston.
  • the annular space is preferably connected to the transmission space via a through hole running in the radial direction in the one piston.
  • Another preferred exemplary embodiment of the coupler is characterized in that the annular space is partially delimited in the axial direction by the other piston and by a fixed housing. This arrangement is particularly easy to implement in terms of production technology.
  • Another preferred embodiment of the coupler is characterized in that between the other piston and the fixed housing part, a spring element is clamped.
  • the spring element forms a return spring for the other booster piston.
  • Another preferred exemplary embodiment of the coupler is characterized in that the additional receiving space for hydraulic medium is delimited radially on the outside by a corrugated bellows.
  • the corrugated bellows acts both as a sealing element and as a spring element.
  • Another preferred exemplary embodiment of the coupler is characterized in that the corrugated bellows is radial. Direction is deformable. As a result, the bellows can provide the pre-tension of the filling pressure.
  • Figure 1 shows a part of a fuel injector with a hydraulic coupler in longitudinal section
  • Figure 2 shows a bellows from Figure 1 in an enlarged view
  • Figure 3 shows a throttle from Figure 1 in an enlarged view. Description of the embodiment
  • a part of a fuel injector is shown in longitudinal section in FIG.
  • fuel injection valves are used to inject the fuel, in particular gasoline, into the combustion chamber.
  • the fuel injection valve comprises a valve housing 1, of which only an essentially circular body with a rectangular cross section is shown in FIG. 1 for reasons of clarity.
  • the injection is triggered by a piezo actuator 4, which acts on a first booster piston 6.
  • the first booster piston 6 is hydraulically coupled to a second booster piston 7.
  • an essentially circular end face 8 is formed, against which the piezo actuator 4 rests.
  • a central blind hole 9 is formed, which has a substantially circular cylindrical shape.
  • One end of the second booster piston 7 is guided in the blind hole 9 in a sealing manner.
  • the guide enables the two booster pistons 6 and 7 to move relative to one another in the axial direction.
  • the end face 12 of the second booster piston 7 facing the first booster piston 6 delimits a booster chamber 14 in the blind hole 9.
  • the booster room 14 is filled with a hydraulic medium, such as silicone oil, in order to enable hydraulic coupling between the two booster pistons 6 and 7.
  • the booster chamber 14 is connected to an additional receiving space 15, which is arranged radially outside the second booster piston 7 between the valve housing 1 and the first booster piston 6.
  • the additional receiving space 15 forms an annular space which is radially on the inside through the second translator column. ben 7, in the axial direction by the first booster piston 6 and the valve housing 1, and radially on the outside by a bellows 17.
  • the corrugated bellows 17 is fastened to the first booster piston 6 in a sealing manner with the aid of a weld seam 20. On the other hand is the bellows 17 with the help of a
  • a return spring 24 for example a helical compression spring, is biased in the axial direction between the first booster piston 6 and the valve housing 1.
  • the return spring 24 serves to reset the first booster piston 6 after actuation of the piezo actuator 4.
  • a central through hole 28 is provided in the second booster piston 7 and runs in the direction of the longitudinal axis of the piston.
  • a throttle 29 with a narrowed cross section is formed at the end of the through hole 28 facing the translation chamber 14. At the other end of the through hole 28 is one
  • Diameter extension 30 arranged with an internal thread.
  • a transverse bore 32 extends from the through hole 28 and opens into the additional receiving space 15.
  • the central through hole 28 is closed by a spherical sealing element 34 which is pressed against an associated seat by means of a screw 36 which is screwed into the internal thread of the diameter extension 30.
  • the translation chamber 14 and the additional receiving space 15 are filled with a hydraulic medium, such as silicone oil, via the through hole 28 and the transverse bore 32.
  • a hydraulic medium such as silicone oil
  • the through hole 28 is closed by the spherical sealing element 34 and the screw 36.
  • the over Setter space 14 communicates with the additional receiving space 15 via the through hole 28 and the transverse bore 32.
  • the corrugated bellows 17 can be deformed in the radial direction in the direction of an arrow 40 when the additional holding space 15 is filled. Such a radial deformation of the bellows 17 is indicated at 17 '.
  • the deformation of the corrugated bellows 17 to 17 ′ enables the filling pressure to be preloaded in the additional receiving space 15. This preload also acts in the transmission chamber 14 via the transverse bore 32, the through hole 28 and the throttle 29.
  • the booster chamber 14 is sealed by the guide between the two booster pistons 6 and 7.
  • the throttle 29 is used to quickly fill the booster chamber 14 after an injection.
  • the prestress for the pressure drop required to fill the booster chamber 14 is provided by the corrugated bellows 17, which exerts both a sealing effect and a spring effect.
  • the corrugated bellows 17 is designed such that it can expand not only in the axial direction but also in the radial direction.

Landscapes

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

Abstract

A hydraulic coupler for a fuel injection valve, having a first booster piston that can be coupled to an actuator and a second booster piston that can be coupled to a nozzle needle and a lifetime filling of a hydraulic fluid hydraulically coupling the two booster pistons to each other. One end of one of the second booster pistons is guided in an end of the first booster piston defined a booster chamber between the booster piston which communicates with an additional enclosure for hydraulic fluid, which is sealed shut by means of a spring/sealing element.

Description

Hydraulischer Koppler und KraftstoffeinspritzventilHydraulic coupler and fuel injector
Die Erfindung betrifft einen hydraulischen Koppler für ein Kraftstoffeinspritzventil, mit einem Ubersetzerkolben, der mit einem Aktor, insbesondere einem Piezoaktor, koppelbar ist, und mit einem weiteren Ubersetzerkolben, der mit einer Düsennadel koppelbar ist, wobei zwischen den beiden Ubersetzerkolben eine Lebensdauerbefüllung eines Hydraulikmediums angeordnet ist, um die beiden Ubersetzerkolben hydraulisch miteinander zu koppeln. Die Erfindung betrifft auch ein Kraftstoffeinspritzventil.The invention relates to a hydraulic coupler for a fuel injection valve, with a booster piston that can be coupled to an actuator, in particular a piezo actuator, and with a further booster piston that can be coupled with a nozzle needle, a lifetime filling of a hydraulic medium being arranged between the two booster pistons to hydraulically couple the two booster pistons together. The invention also relates to a fuel injection valve.
Stand der TechnikState of the art
Hydraulische Koppler dienen dazu, Temperaturunterschiede zwischen Aktor und Düsennadel auszugleichen. Der Begriff Lebensdauerbefüllung soll verdeutlichen, dass der Koppler vor der Inbetriebnahme mit Hydraulikmedium befüllt wird und diese Befüllung wäh- rend der gesamten Lebensdauer nicht mehr ersetzt oder ergänzt wird. Demzufolge sind an die Dichtigkeit hohe Anforderungen zu stellen. Herkömmliche Koppler sind oft kompliziert aufgebaut und/oder nur mit hohem Aufwand zu befüllen.Hydraulic couplers are used to compensate for temperature differences between the actuator and the nozzle needle. The term service life filling is intended to clarify that the coupler is filled with hydraulic medium before commissioning and that this filling is no longer replaced or supplemented during the entire service life. As a result, high demands must be placed on tightness. Conventional couplers are often of complex construction and / or can only be filled with great effort.
Aufgabe der Erfindung ist es daher, einen hydraulischen Koppler und ein Kraftstoffeinspritzventil der eingangs geschilderten Art zu schaffen, die einfach aufgebaut und kostengünstig herstellbar sind. Dar- über hinaus soll der zu schaffende Koppler mit geringem Aufwand zu befüllen sein.The object of the invention is therefore to provide a hydraulic coupler and a fuel injection valve of the type described at the outset, which are simple in construction and can be produced cost-effectively. representation Furthermore, the coupler to be created should be able to be filled with little effort.
Vorteile der ErfindungAdvantages of the invention
Die Aufgabe ist bei einem hydraulischen Koppler für ein Kraftstoffeinspritzventil, mit einem Ubersetzerkolben, der mit einem Aktor, insbesondere mit einem Piezoaktor, koppelbar ist, und mit einem weiteren Ubersetzerkolben, der mit einer Düsennadel koppelbar ist, wobei zwischen den beiden Ubersetzerkolben eine Lebensdauerbefüllung eines Hydraulikmediums angeordnet ist, um die beiden Ubersetzerkolben hydraulisch miteinander zu koppeln, dadurch gelöst, dass ein Ende eines der Ubersetzerkolben in einem Ende des anderen Ubersetzerkolben geführt ist, und dadurch, dass ein zwischen den Stirn- Seiten des einen Übersetzerkolbens und dem anderen Ubersetzerkolben ausgebildeter Ubersetzerraum mit einem zusätzlichen Aufnahmeraum für Hydraulikmedium in Verbindung steht, der durch ein Feder-Dichtelement abgedichtet ist. Das Feder-Dichtelement dient einerseits zur Abdichtung des zusätzlichen Aufnahmeraums für Hyd- raulikmedium. Andererseits kann durch das Feder-Dichtelement die Vorspannung für den Befüllungsdruck bereitgestellt werden.The task is in a hydraulic coupler for a fuel injection valve, with a booster piston that can be coupled to an actuator, in particular with a piezo actuator, and with a further booster piston that can be coupled with a nozzle needle, a lifetime filling of a hydraulic medium between the two booster pistons is arranged in order to hydraulically couple the two booster pistons to one another, solved in that one end of one of the booster pistons is guided in one end of the other booster piston, and in that a booster chamber formed between the end faces of the one booster piston and the other booster piston also an additional receiving space for hydraulic medium is connected, which is sealed by a spring sealing element. The spring sealing element serves on the one hand to seal the additional receiving space for hydraulic medium. On the other hand, the preload for the filling pressure can be provided by the spring sealing element.
Ein bevorzugtes Ausführungsbeispiel des Kopplers ist dadurch gekennzeichnet, dass in dem einen Ubersetzerkolben ein Verbindungs- kanal ausgebildet ist, der den Ubersetzerraum mit dem zusätzlichen Aufnahmeraum für Hydraulikmedium verbindet. Dadurch wird der Aufbau des Kopplers erheblich vereinfacht.A preferred exemplary embodiment of the coupler is characterized in that a connecting channel is formed in the one booster piston, which connects the booster space to the additional receiving space for hydraulic medium. This considerably simplifies the construction of the coupler.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kopplers ist da- durch gekennzeichnet, dass der Verbindungskanal mit einer Drossel ausgestattet ist. Die Drossel ermöglicht eine Befüllung des Übersetzerraums nach einer Einspritzung und verhindert gleichzeitig, dass ein großer Volumenstrom des Hydraulikmediums unkontrolliert aus dem Ubersetzerraum austritt. Ein weiteres bevorzugtes Ausführungsbeispiel des Kopplers ist dadurch gekennzeichnet, dass die Drossel in Befüllungsrichtung einseitig verrundet ist. Dadurch wird das Befüllen des Übersetzerraums weiter vereinfacht.Another preferred exemplary embodiment of the coupler is characterized in that the connecting channel is equipped with a throttle. The throttle enables the booster chamber to be filled after an injection and at the same time prevents a large volume flow of the hydraulic medium from escaping from the booster chamber in an uncontrolled manner. Another preferred exemplary embodiment of the coupler is characterized in that the throttle is rounded on one side in the filling direction. This further simplifies filling the translator room.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kopplers ist dadurch gekennzeichnet, dass der Verbindungskanal ein Durchgangsloch umfasst, das in Längsrichtung des einen Übersetzerkolbens ver- läuft. Durch das Durchgangsloch kann der Koppler vor der ersten Inbetriebnahme auf einfache Art und Weise befüllt werden.Another preferred exemplary embodiment of the coupler is characterized in that the connecting channel comprises a through hole which runs in the longitudinal direction of the one booster piston. Through the through hole, the coupler can be filled easily before the first start-up.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kopplers ist dadurch gekennzeichnet, dass das Durchgangsloch auf der dem Über- setzerraum abgewandten Seite des einen Übersetzerkolbens durch ein Dichtelement verschlossen ist. Bei dem Dichtelement kann es sich zum Beispiel um eine Kugel handeln, die durch eine Schraube gegen einen zugehörigen Sitz gedrückt wird.Another preferred exemplary embodiment of the coupler is characterized in that the through hole on the side of the one booster piston facing away from the booster chamber is closed by a sealing element. The sealing element can, for example, be a ball that is pressed against an associated seat by a screw.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kopplers ist dadurch gekennzeichnet, dass der zusätzliche Aufnahmeraum für Hydraulikmedium von . einem Ringraum gebildet wird, der radial außerhalb des einen Kolbens angeordnet ist. Vorzugsweise steht der Ringraum über ein in radialer Richtung in dem einen Kolben verlaufendes Durchgangsloch mit dem Ubersetzerraum in Verbindung.Another preferred exemplary embodiment of the coupler is characterized in that the additional receiving space for hydraulic medium from. an annular space is formed, which is arranged radially outside the one piston. The annular space is preferably connected to the transmission space via a through hole running in the radial direction in the one piston.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kopplers ist dadurch gekennzeichnet, dass der Ringraum in axialer Richtung durch den anderen Kolben und durch ein feststehendes Gehäuse teilbe- grenzt wird. Diese Anordnung ist fertigungstechnisch besonders einfach zu realisieren.Another preferred exemplary embodiment of the coupler is characterized in that the annular space is partially delimited in the axial direction by the other piston and by a fixed housing. This arrangement is particularly easy to implement in terms of production technology.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kopplers ist dadurch gekennzeichnet, dass zwischen dem anderen Kolben und dem feststehenden Gehäuseteil ein Federelement eingespannt ist. Das Federelement bildet eine Rückstellfeder für den anderen Ubersetzerkolben.Another preferred embodiment of the coupler is characterized in that between the other piston and the fixed housing part, a spring element is clamped. The spring element forms a return spring for the other booster piston.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kopplers ist dadurch gekennzeichnet, dass der zusätzliche Aufnahmeraum für Hydraulikmedium radial außen von einem Wellbalg begrenzt wird. Der Wellbalg wirkt sowohl als Dichtelement als auch als Federelement.Another preferred exemplary embodiment of the coupler is characterized in that the additional receiving space for hydraulic medium is delimited radially on the outside by a corrugated bellows. The corrugated bellows acts both as a sealing element and as a spring element.
Ein weiteres bevorzugtes Ausführungsbeispiel des Kopplers ist dadurch gekennzeichnet, dass der Wellbalg in radialer. Richtung verformbar ist. Dadurch kann der Wellbalg die Vorspannung des Befül- lungsdrucks bereitstellen.Another preferred exemplary embodiment of the coupler is characterized in that the corrugated bellows is radial. Direction is deformable. As a result, the bellows can provide the pre-tension of the filling pressure.
Bei einem Kraftstoffeinspritzventil ist die oben angegebene Aufgabe durch einen vorab beschriebenen Koppler gelöst.In the case of a fuel injection valve, the above-mentioned object is achieved by a coupler described above.
Zeichnungdrawing
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel im Einzelnen beschrieben ist. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Korn- bination erfindungswesentlich sein. Es zeigen:Further advantages, features and details of the invention result from the following description, in which an exemplary embodiment is described in detail with reference to the drawing. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. Show it:
Figur 1 einen Teil eines Kraftstoffeinspritzventils mit einem hydraulischen Koppler im Längsschnitt;Figure 1 shows a part of a fuel injector with a hydraulic coupler in longitudinal section;
Figur 2 einen Wellbalg aus Figur 1 in vergrößerter Darstellung undFigure 2 shows a bellows from Figure 1 in an enlarged view
Figur 3 eine Drossel aus Figur 1 in vergrößerter Darstellung. Beschreibung des AusführungsbeispielsFigure 3 shows a throttle from Figure 1 in an enlarged view. Description of the embodiment
In Figur 1 ist ein Teil eines Kraftstoffeinspritzventils im Längsschnitt dargestellt. Kraftstoffeinspritzventile dienen in modernen Brennkraft- maschinen, insbesondere Verbrennungsmotoren in Kraftfahrzeugen, dazu, den Kraftstoff, insbesondere Benzin, in den Brennraum einzuspritzen. Das Kraftstoffeinspritzventil umfasst ein Ventilgehäuse 1, von dem in Figur 1 aus Gründen der Übersichtlichkeit nur ein im Wesentlichen kreisringförmiger Körper mit einem rechteckigen Quer- schnitt dargestellt ist. Die Einspritzung wird durch einen Piezoaktor 4 ausgelöst, der einen ersten Ubersetzerkolben 6 beaufschlagt. Der erste Ubersetzerkolben 6 ist hydraulisch mit einem zweiten Ubersetzerkolben 7 gekoppelt. An einem Ende des ersten Übersetzerkolbens 6 ist eine im Wesentlichen kreisschreibenförmige Stirnfläche 8 ausgebildet, an der der Piezoaktor 4 anliegt. An dem anderen Ende des ersten Übersetzerkolbens 6 ist ein zentrales Sackloch 9 ausgebildet, das eine im Wesentlichen kreiszylinderförmige Gestalt aufweist.A part of a fuel injector is shown in longitudinal section in FIG. In modern internal combustion engines, in particular internal combustion engines in motor vehicles, fuel injection valves are used to inject the fuel, in particular gasoline, into the combustion chamber. The fuel injection valve comprises a valve housing 1, of which only an essentially circular body with a rectangular cross section is shown in FIG. 1 for reasons of clarity. The injection is triggered by a piezo actuator 4, which acts on a first booster piston 6. The first booster piston 6 is hydraulically coupled to a second booster piston 7. At one end of the first booster piston 6, an essentially circular end face 8 is formed, against which the piezo actuator 4 rests. At the other end of the first booster piston 6, a central blind hole 9 is formed, which has a substantially circular cylindrical shape.
In dem Sackloch 9 ist ein Ende des zweiten Übersetzerkolbens 7 in abdichtender Art und Weise geführt. Durch die Führung wird eine Relativbewegung der beiden Ubersetzerkolben 6 und 7 zueinander in axialer Richtung ermöglicht. Die dem ersten Ubersetzerkolben 6 zugewandte Stirnseite 12 des zweiten Übersetzerkolbens 7 begrenzt in dem Sackloch 9 einen Ubersetzerraum 14. Der Ubersetzerraum 14 ist mit einem Hydraulikmedium, wie Silikonöl, befüllt, um eine hydraulische Kopplung zwischen den beiden Ubersetzerkolben 6 und 7 zu ermöglichen.One end of the second booster piston 7 is guided in the blind hole 9 in a sealing manner. The guide enables the two booster pistons 6 and 7 to move relative to one another in the axial direction. The end face 12 of the second booster piston 7 facing the first booster piston 6 delimits a booster chamber 14 in the blind hole 9. The booster room 14 is filled with a hydraulic medium, such as silicone oil, in order to enable hydraulic coupling between the two booster pistons 6 and 7.
Der Ubersetzerraum 14 steht mit einem zusätzlichen Aufnahmeraum 15 in Verbindung, der radial außerhalb des zweiten Übersetzerkolbens 7 zwischen dem Ventilgehäuse 1 und dem ersten Ubersetzerkolben 6 angeordnet ist. Der zusätzliche Aufnahmeraum 15 bildet einen Ringraum, der radial innen durch den zweiten Übersetzerkol- ben 7, in axialer Richtung durch den ersten Ubersetzerkolben 6 und das Ventilgehäuse 1 , und radial außen durch einen Wellbalg 17 begrenzt wird. Der Wellbalg 17 ist mit Hilfe einer Schweißnaht 20 in abdichtender Art und Weise an dem ersten Ubersetzerkolben 6 be- festigt. Auf der anderen Seite ist der Wellbalg 17 mit Hilfe einerThe booster chamber 14 is connected to an additional receiving space 15, which is arranged radially outside the second booster piston 7 between the valve housing 1 and the first booster piston 6. The additional receiving space 15 forms an annular space which is radially on the inside through the second translator column. ben 7, in the axial direction by the first booster piston 6 and the valve housing 1, and radially on the outside by a bellows 17. The corrugated bellows 17 is fastened to the first booster piston 6 in a sealing manner with the aid of a weld seam 20. On the other hand is the bellows 17 with the help of a
Schweißnaht 21 in abdichtender Art und Weise an dem Ventilgehäuse 1 befestigt.Welded 21 attached to the valve housing 1 in a sealing manner.
In dem zusätzlichen Aufnahmeraum 15 ist eine Rückstellfeder 24, zum Beispiel eine Schraubendruckfeder, in axialer Richtung zwischen dem ersten Ubersetzerkolben 6 und dem Ventilgehäuse 1 vorgespannt. Die Rückstellfeder 24 dient dazu, den ersten Ubersetzerkolben 6 nach einer Betätigung des Piezoaktors 4 wieder zurückzustellen.In the additional receiving space 15, a return spring 24, for example a helical compression spring, is biased in the axial direction between the first booster piston 6 and the valve housing 1. The return spring 24 serves to reset the first booster piston 6 after actuation of the piezo actuator 4.
In dem zweiten Ubersetzerkolben 7 ist ein zentrales Durchgangsloch 28 vorgesehen, das in Richtung der Kolbenlängsachse verläuft. An dem dem Ubersetzerraum 14 zugewandten Ende des Durchgangslochs 28 ist eine Drossel 29 mit einem verengten Querschnitt ausge- bildet. An dem anderen Ende des Durchgangslochs 28 ist eineA central through hole 28 is provided in the second booster piston 7 and runs in the direction of the longitudinal axis of the piston. A throttle 29 with a narrowed cross section is formed at the end of the through hole 28 facing the translation chamber 14. At the other end of the through hole 28 is one
Durchmessererweiterung 30 mit einem Innengewinde angeordnet. Im Bereich des Wellbalgs 17 geht von dem Durchgangsloch 28 eine Querbohrung 32 aus, die in den zusätzlichen Aufnahmeraum 15 mündet. Auf der dem Ubersetzerraum 14 abgewandten Seite ist das zentrale Durchgangsloch 28 durch ein kugelförmiges Dichtelement 34 verschlossen, das mit Hilfe einer Schraube 36, die in das Innengewinde der Durchmessererweiterung 30 eingeschraubt ist, gegen einen zugehörigen Sitz gepresst wird.Diameter extension 30 arranged with an internal thread. In the area of the corrugated bellows 17, a transverse bore 32 extends from the through hole 28 and opens into the additional receiving space 15. On the side facing away from the translator space 14, the central through hole 28 is closed by a spherical sealing element 34 which is pressed against an associated seat by means of a screw 36 which is screwed into the internal thread of the diameter extension 30.
Vor der ersten Inbetriebnahme wird der Ubersetzerraum 14 und der zusätzliche Aufnahmeraum 15 über das Durchgangsloch 28 und die Querbohrung 32 mit einem Hydraulikmedium, wie Silikonöl, befüllt. Nach dem Befüllen wird das Durchgangsloch 28 durch das kugelförmige Dichtelement 34 und die Schraube 36 verschlossen. Der Über- setzerraum 14 steht über das Durchgangsloch 28 und die Querbohrung 32 mit dem zusätzlichen Aufnahmeraum 15 in Verbindung.Before the first start-up, the translation chamber 14 and the additional receiving space 15 are filled with a hydraulic medium, such as silicone oil, via the through hole 28 and the transverse bore 32. After filling, the through hole 28 is closed by the spherical sealing element 34 and the screw 36. The over Setter space 14 communicates with the additional receiving space 15 via the through hole 28 and the transverse bore 32.
In Figur 2 sieht man, dass der Wellbalg 17 beim Befüllen des zusätz- liehen Aufnahmeraums 15 in Richtung eines Pfeils 40 in radialer Richtung verformt werden kann. Eine solche radiale Verformung des Weilbalgs 17 ist bei 17' angedeutet. Durch die Verformung des Wellbalgs 17 nach 17' wird eine Vorspannung des Befüllungsdrucks in dem zusätzlichen Aufnahmeraum 15 ermöglicht. Diese Vorspannung wirkt über die Querbohrung 32, das Durchgangsloch 28 und die Drossel 29 auch in dem Ubersetzerraum 14.In FIG. 2 it can be seen that the corrugated bellows 17 can be deformed in the radial direction in the direction of an arrow 40 when the additional holding space 15 is filled. Such a radial deformation of the bellows 17 is indicated at 17 '. The deformation of the corrugated bellows 17 to 17 ′ enables the filling pressure to be preloaded in the additional receiving space 15. This preload also acts in the transmission chamber 14 via the transverse bore 32, the through hole 28 and the throttle 29.
In Figur 3 sieht man, dass die Drossel 29 auf ihrer dem Ubersetzerraum 14 abgewandten Seite verrundet ausgebildet ist. Durch die Rundung wird das Befüllen des Übersetzerraums 14 vereinfacht.In FIG. 3 it can be seen that the throttle 29 is rounded on its side facing away from the translation chamber 14. The rounding simplifies the filling of the translator room 14.
Der Ubersetzerraum 14 wird durch die Führung zwischen den beiden Ubersetzerkolben 6 und 7 abgedichtet. Die Drossel 29 dient zur schnellen Befüllung des Übersetzerraums 14 nach einer Einsprit- zung. Die Vorspannung für das zur Befüllung des Übersetzerraum14 notwenige Druckgefälle wird durch den Wellbalg 17 bereitgestellt, der sowohl eine Dichtwirkung als auch eine Federwirkung entfaltet. Der Wellbalg 17 ist so ausgelegt, dass er sich nicht nur in axialer Richtung sondern auch in radialer Richtung ausdehnen kann. The booster chamber 14 is sealed by the guide between the two booster pistons 6 and 7. The throttle 29 is used to quickly fill the booster chamber 14 after an injection. The prestress for the pressure drop required to fill the booster chamber 14 is provided by the corrugated bellows 17, which exerts both a sealing effect and a spring effect. The corrugated bellows 17 is designed such that it can expand not only in the axial direction but also in the radial direction.

Claims

Patentansprüche claims
1. Hydraulischer Koppler für ein Kraftstoffeinspritzventil mit einem Ubersetzerkolben (6), der mit einem Aktor (4), insbesondere einem Piezoaktor, koppelbar ist, und mit einem weiteren Ubersetzerkolben (7), der mit einer Düsennadel koppelbar ist, wobei zwischen den beiden Ubersetzerkolben (6, 7) eine Lebensdauerbefüllung eines Hydraulikmediums angeordnet ist, um die beiden Ubersetzerkolben (6, 7) hydraulisch miteinander zu koppeln, dadurch gekennzeichnet, dass ein Ende eines der Ubersetzerkolben (7) in einem Ende des anderen Ü- bersetzerkolbens (6) geführt ist, und dadurch, dass ein zwischen der Stirnseite (12) des einen Übersetzerkolbens (7) und dem anderen Ubersetzerkolben (6) ausgebildeter Ubersetzerraum (14) mit einem zusätzlichen Aufnahmeraum (15) für Hydraulikmedium in Verbindung steht, der durch ein Feder- Dichtelement (17) abgedichtet ist.1. Hydraulic coupler for a fuel injection valve with a booster piston (6) which can be coupled with an actuator (4), in particular a piezo actuator, and with a further booster piston (7) which can be coupled with a nozzle needle, between the two booster pistons (6, 7) a lifetime filling of a hydraulic medium is arranged in order to hydraulically couple the two booster pistons (6, 7) to one another, characterized in that one end of one of the booster pistons (7) is guided in one end of the other booster piston (6) is, and in that a between the end face (12) of the one booster piston (7) and the other booster piston (6) trained booster chamber (14) is connected to an additional receiving space (15) for hydraulic medium, which is connected by a spring sealing element (17) is sealed.
2. Koppler nach Anspruch 1 , dadurch gekennzeichnet, dass in dem einen Ubersetzerkolben (7) ein Verbindungskanal (28, 32), ausgebildet ist, der den Ubersetzerraum (14) mit dem zu- sätzlichen Aufnahmeraum (15) für Hydraulikmedium verbindet.2. Coupler according to claim 1, characterized in that in the one booster piston (7) a connecting channel (28, 32) is formed, which connects the booster chamber (14) with the additional receiving space (15) for hydraulic medium.
3. Koppler nach Anspruch 2, dadurch gekennzeichnet, dass der Verbindungskanal (28, 32) mit einer Drossel (29) ausges- tattet ist.3. Coupler according to claim 2, characterized in that the connecting channel (28, 32) is equipped with a throttle (29).
4. Koppler nach Anspruch 3, dadurch gekennzeichnet, dass die Drossel (29) in Befüllungsrichtung einseitig verrundet ist. 4. Coupler according to claim 3, characterized in that the throttle (29) is rounded on one side in the filling direction.
5. Koppler nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass der Verbindungskanal ein Durchgangsloch (28) umfasst, das in Längsrichtung des einen Übersetzerkolbens (7) verläuft.5. Coupler according to one of claims 2 to 4, characterized in that the connecting channel comprises a through hole (28) which extends in the longitudinal direction of the one booster piston (7).
6. Koppler nach Anspruch 5, dadurch gekennzeichnet, dass das Durchgangsloch (28) auf der dem Ubersetzerraum (14) abgewandten Seite des einen Übersetzerkolbens (7) durch ein Dichtelement (34) verschlossen ist.6. Coupler according to claim 5, characterized in that the through hole (28) on the side facing away from the translator space (14) of the one translator piston (7) is closed by a sealing element (34).
7. Koppler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der zusätzliche Aufnahmeraum (15) für Hydraulikmedium von einem Ringraum gebildet wird, der radial außerhalb des einen Kolbens (7) angeordnet ist.7. Coupler according to one of the preceding claims, characterized in that the additional receiving space (15) for hydraulic medium is formed by an annular space which is arranged radially outside the one piston (7).
8. Koppler nach Anspruch 7, dadurch gekennzeichnet, dass der Ringraum (15) in axialer Richtung durch den anderen Kolben (6) und durch ein feststehendes Gehäuseteil (1) begrenzt wird.8. Coupler according to claim 7, characterized in that the annular space (15) is limited in the axial direction by the other piston (6) and by a fixed housing part (1).
9. Koppler nach Anspruch 8, dadurch gekennzeichnet, dass zwischen dem anderen Kolben (6) und dem feststehenden Gehäuseteil (1) ein Federelement (24) eingespannt ist.9. Coupler according to claim 8, characterized in that a spring element (24) is clamped between the other piston (6) and the fixed housing part (1).
10. Koppler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der zusätzliche Aufnahmeraum (15) für Hydraulikmedium radial außen von einem Wellbalg (17) begrenzt wird.10. Coupler according to one of the preceding claims, characterized in that the additional receiving space (15) for hydraulic medium is delimited radially on the outside by a corrugated bellows (17).
11. Koppler nach Anspruch 10, dadurch gekennzeichnet, dass der Wellbalg (17) in radialer Richtung verformbar ist.11. Coupler according to claim 10, characterized in that the corrugated bellows (17) is deformable in the radial direction.
12. Kraftstoffeinspritzventil mit einem hydraulischen Koppler nach einem der vorhergehenden Ansprüche. 12. Fuel injection valve with a hydraulic coupler according to one of the preceding claims.
EP04738650A 2003-07-19 2004-06-09 Hydraulic coupler and fuel injection valve Expired - Lifetime EP1651859B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10332874A DE10332874A1 (en) 2003-07-19 2003-07-19 Hydraulic coupler and fuel injector
PCT/DE2004/001198 WO2005010343A1 (en) 2003-07-19 2004-06-09 Hydraulic coupler and fuel injection valve

Publications (2)

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EP1651859A1 true EP1651859A1 (en) 2006-05-03
EP1651859B1 EP1651859B1 (en) 2010-11-03

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US (1) US20060214021A1 (en)
EP (1) EP1651859B1 (en)
JP (1) JP4478681B2 (en)
KR (1) KR20060060659A (en)
AT (1) ATE487051T1 (en)
DE (2) DE10332874A1 (en)
TW (1) TW200504282A (en)
WO (1) WO2005010343A1 (en)

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DE102004005456A1 (en) 2004-02-04 2005-08-25 Robert Bosch Gmbh Fuel injector with direct-acting injection valve member
EP2273099B1 (en) * 2009-06-17 2012-02-22 Delphi Technologies, Inc. Fuel injector with lash compensator
DE102010029123A1 (en) 2010-05-19 2011-11-24 Robert Bosch Gmbh Fuel injector with hydraulic coupler unit
US9562497B2 (en) 2014-06-18 2017-02-07 Caterpillar Inc. Engine system having piezo actuated gas injector

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JPH0656162B2 (en) * 1987-03-03 1994-07-27 トヨタ自動車株式会社 Variable stroke device
DE4306072C2 (en) * 1993-02-26 1994-12-08 Siemens Ag Device for opening and closing a passage opening in a housing
DE29708546U1 (en) * 1997-05-14 1998-09-10 FEV Motorentechnik GmbH & Co. KG, 52078 Aachen Electric solid state actuator with hydraulic transmission
DE19838862A1 (en) * 1998-08-26 2000-03-09 Siemens Ag Rapid mixing injection valve for internal combustion engine
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DE10332874A1 (en) 2005-02-10
KR20060060659A (en) 2006-06-05
JP2006528295A (en) 2006-12-14
EP1651859B1 (en) 2010-11-03
DE502004011854D1 (en) 2010-12-16
ATE487051T1 (en) 2010-11-15
US20060214021A1 (en) 2006-09-28
WO2005010343A1 (en) 2005-02-03
TW200504282A (en) 2005-02-01
JP4478681B2 (en) 2010-06-09

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