EP2427649A1 - Device for injecting fuel - Google Patents

Device for injecting fuel

Info

Publication number
EP2427649A1
EP2427649A1 EP10707271A EP10707271A EP2427649A1 EP 2427649 A1 EP2427649 A1 EP 2427649A1 EP 10707271 A EP10707271 A EP 10707271A EP 10707271 A EP10707271 A EP 10707271A EP 2427649 A1 EP2427649 A1 EP 2427649A1
Authority
EP
European Patent Office
Prior art keywords
actuator
fuel
valve needle
pressure
side part
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
EP10707271A
Other languages
German (de)
French (fr)
Other versions
EP2427649B1 (en
Inventor
Ralph Engelberg
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 EP2427649A1 publication Critical patent/EP2427649A1/en
Application granted granted Critical
Publication of EP2427649B1 publication Critical patent/EP2427649B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • 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
    • F02M61/161—Means for adjusting injection-valve lift

Definitions

  • the present invention relates to a device for injecting fuel, which can be used in particular in internal combustion engines with direct injection in the stratified charge mode.
  • Devices for injecting fuel for internal combustion engines with direct injection are generally carried out in the prior art as high-pressure injection valves with outwardly opening valve needles, which are actuated by piezo actuators and controlled for the required highly dynamic switching times with complex power amplifiers.
  • High demands on the material quality and manufacturing tolerances of the individual components of these injectors lead to long processing test and production times and the resulting high production costs of these injectors.
  • the device according to the invention for injecting fuel with the features of claim 1 has the advantage that this has both a simpler and thus more cost-effective structure, as well as less critical in terms of the required manufacturing and position tolerances of the individual components.
  • This is inventively achieved in that the Device for injecting fuel, a multi-part, outwardly opening valve needle and a membrane which fluid-tightly divides an actuator space in a first fuel-filled area and a second fuel-free area and at the same time divides the valve needle into an injection-side part and an actuator-side part.
  • a pressure equalizing piston which is arranged on the injection-side part of the valve needle, while a fuel-filled pressure chamber is separated from the first fuel-filled portion of the actuator chamber.
  • the actuator is arranged here in the second fuel-free region of the actuator chamber, a cost-effective electromagnetic actuator can be used, which can achieve the desired highly dynamic switching times. Furthermore, the advantageous use of special soft magnetic materials in the actuator is possible because the actuator components are not exposed to any corrosive effect of the fuel.
  • the pressure compensation piston is slidably disposed with little play in a cylindrical bore of a valve body and provided with a sealing gap.
  • the device according to the invention preferably has a fuel return line from the first region of the actuator chamber to a fuel
  • an armature is arranged on the actuator-side part of the valve needle.
  • the actuator comprises a Freiwegfeder whose spring force is designed so that the actuator-side part of the valve needle is always applied to the diaphragm even when not actuated actuator.
  • Anchor is in a defined starting position.
  • the return element is designed so that the injection-side part of the valve needle, even when not actuated actuator, d. H. closed valve needle, always applied to the membrane. This will lift the
  • the actuator-side and the injection-side part are always in contact with the membrane in each operating state of the injection device.
  • the injection-side part of the valve needle is formed in two parts with a needle and the pressure compensation piston.
  • a membrane-facing end of the pressure-compensating piston and a membrane facing the end of the actuator-side part of the valve needle are each formed rounded.
  • a homogeneous edition of these ends, in particular in a shifted, d. H. bagged state of the membrane ensured and damage the membrane, z. B. by sharp edges of non-rounded end portions of the pressure compensating piston and the actuator-side part of the valve needle avoided.
  • Figure 1 is a schematically simplified sectional view of a
  • the device 1 for injecting fuel comprises a valve body 2 and an outwardly opening valve needle 3, which is formed from an injection-side part 3a and an actuator-side part 3b.
  • the injection-side part 3a of the valve needle 3 comprises a needle 31 and a pressure compensation piston 10, which are arranged in a pressure chamber 4, the fuel is supplied via a supply line 19 under pressure.
  • the pressure compensation piston 10 is slidably disposed in a cylindrical bore 16 of the valve body 2 with little play.
  • a return element 20 is further arranged, which is supported between the valve body 2 and the needle 31 and the valve needle 3 returns to an initial position after actuation.
  • an electromagnetic actuator 6 is arranged, which comprises a coil 8 and an armature 7, preferably of the type of one shown here
  • Flat anchor comprises, which is attached to the actuator-side part 3b of the valve needle 3.
  • a diaphragm 13 is further arranged, which is attached to the valve body 2 and on the one hand the valve needle 3 divided into the injection-side part 3a and the actuator-side part 3b, and on the other hand, the actuator chamber 9 in a first fuel-filled region 5 and a second fuel-free region 18 divided fluid-tight.
  • the first region 5 of the actuator chamber 9 is at least partially filled with fuel which enters the first fuel-filled region 5 via a sealing gap 17 formed on the surface of the pressure-compensating piston 10 as a result of the higher pressure from the pressure chamber 4.
  • an end 10a of the pressure-compensating piston 10 facing the diaphragm 13 and an end 15 of the actuator-side part 3b of the valve needle 3 facing the diaphragm 13 are in each case rounded. As a result, damage to the membrane 13 can be prevented by the possibly formed paragraphs or edges on the end of this
  • Components would be caused when moving or buckling of the membrane 13 during operation of the device 1.
  • a fuel return line 14 branches off from the first fuel-filled region 5 of the actuator chamber 9. Through this fuel
  • a free-return spring 12 is further arranged between the armature 7 and a closing element 21 and supports the actuator-side part 3b of the valve spring 3 with the armature 7 fixed thereto at a closing element 21.
  • An electrical connection line 22 for the actuator 6 is through the
  • the freewheeling spring 12 is designed so that the actuator-side part 3b of the valve spring 3 rests against the diaphragm 13 even when the actuator 6 is not actuated.
  • the geometry is designed so that the injection-side part 3a of the valve needle 3 rests against the diaphragm 13 even when the actuator 6 is not actuated (closed valve needle). Due to the two-sided concern of the actuator-side and injection-side parts 3a, 3b of Valve needle 3 in each operating state, a quasi-rigid component combination of the device 1 according to the invention for actuating the valve needle 3 is achieved. In this case, a small radial offset or a small angular offset on the diaphragm 13 between the actuator-side and injection-side parts 3a, 3b, if present after assembly, may be present
  • Valve needle 3 are tolerated, since this has no effect on the proper and reliable operation of the device 1 according to the invention.
  • Valve body 2 can be made separately and tested separately.

Landscapes

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

Abstract

The invention relates to a device for injecting fuel, comprising a valve body (2), a valve needle (3) which opens toward the outside and is arranged in the valve body (2) in a pressure chamber (4) which is filled with fuel and to which fuel is fed under pressure, a restoring element (20) which guides the valve needle (3) back into a starting position, an electromagnetic actuator (6) arranged in an actuator chamber (9) in order to actuate the valve needle (3), and a membrane (13) which is arranged in the actuator chamber (9) dividing the actuator chamber (9) into a first fuel-filled region (5) and a second fuel-free region (18) in a fluid-tight manner and dividing the valve needle (3) into an injection-side part (3a) and an actuator-side part (3b), wherein the injection-side part (3a) of the valve needle (3) comprises a pressure compensating piston (10) separating the pressure chamber (4) from the first fuel-filled region (5) of the actuator chamber (9), and wherein the actuator (6) is arranged in the second fuel-free region (18).

Description

Beschreibung description
Titeltitle
Vorrichtung zum Einspritzen von KraftstoffDevice for injecting fuel
Stand der TechnikState of the art
Die vorliegende Erfindung betrifft eine Vorrichtung zum Einspritzen von Kraftstoff, die insbesondere bei Verbrennungsmotoren mit Direkteinspritzung im Schichtladebetrieb einsetzbar ist.The present invention relates to a device for injecting fuel, which can be used in particular in internal combustion engines with direct injection in the stratified charge mode.
Vorrichtungen zum Einspritzen vom Kraftstoff für Verbrennungsmotoren mit Direkteinspritzung werden beim Stand der Technik im Allgemeinen als Hochdruckeinspritzventile mit nach außen öffnenden Ventilnadeln ausgeführt, die von Piezoaktoren betätigt und für die erforderlichen hochdynamischen Schaltzeiten mit aufwendigen Endstufen gesteuert werden. Hohe Anforderungen an die Materialqualität und Fertigungstoleranzen der einzelnen Bauteile dieser Einspritzventile führen zu langen Bearbeitungs- Prüf- und Fertigungszeiten und daraus resultierenden hohen Herstellkosten dieser Einspritzventile.Devices for injecting fuel for internal combustion engines with direct injection are generally carried out in the prior art as high-pressure injection valves with outwardly opening valve needles, which are actuated by piezo actuators and controlled for the required highly dynamic switching times with complex power amplifiers. High demands on the material quality and manufacturing tolerances of the individual components of these injectors lead to long processing test and production times and the resulting high production costs of these injectors.
Von daher sind diese Hochdruckeinspritzventile des Standes der Technik nur unzureichend geeignet, um eine einfache und kostengünstig herstellbare Vorrichtung zum Einspritzen vom Kraftstoff für Verbrennungsmotoren mit Direkteinspritzung im Schichtladebetrieb bereitzustellen.As such, these prior art high pressure injectors are poorly suited to provide a simple and inexpensive injectable fuel injector for direct injection ICE engines in stratified charge mode.
Offenbarung der ErfindungDisclosure of the invention
Die erfindungsgemäße Vorrichtung zum Einspritzen von Kraftstoff mit den Merkmalen des Anspruch 1 weist demgegenüber den Vorteil auf, dass diese sowohl einen einfacheren und damit kostengünstigeren Aufbau aufweist, als auch unkritischer hinsichtlich der benötigten Fertigungs- und Lagetoleranzen der einzelnen Bauteile ist. Dies wird erfindungsgemäß dadurch erreicht, dass die Vorrichtung zum Einspritzen von Kraftstoff eine mehrteilige, nach außen öffnende Ventilnadel und eine Membran aufweist, die einen Aktorraum in einen ersten kraftstoffgefüllten Bereich und einen zweiten kraftstofffreien Bereich fluiddicht unterteilt und gleichzeitig die Ventilnadel in einen einspritzseitigen Teil und einen aktorseitigen Teil unterteilt. Durch einen Druckausgleichskolben, der am einspritzseitigen Teil der Ventilnadel angeordnet ist, wird dabei ein mit Kraftstoff gefüllter Druckraum vom ersten kraftstoffgefüllten Bereich des Aktorraums getrennt. Weil der Aktor hierbei im zweiten kraftstofffreien Bereich des Aktorraums angeordnet ist, kann ein kostengünstiger elektromagnetischer Aktor eingesetzt werden, der die gewünschten hochdynamischen Schaltzeiten erreichen kann. Ferner ist die vorteilhafte Verwendung von speziellen weichmagnetischen Werkstoffen im Aktor möglich, da die Aktorbauteile keiner korrosiven Wirkung des Kraftstoffs ausgesetzt sind.The device according to the invention for injecting fuel with the features of claim 1 has the advantage that this has both a simpler and thus more cost-effective structure, as well as less critical in terms of the required manufacturing and position tolerances of the individual components. This is inventively achieved in that the Device for injecting fuel, a multi-part, outwardly opening valve needle and a membrane which fluid-tightly divides an actuator space in a first fuel-filled area and a second fuel-free area and at the same time divides the valve needle into an injection-side part and an actuator-side part. By a pressure equalizing piston, which is arranged on the injection-side part of the valve needle, while a fuel-filled pressure chamber is separated from the first fuel-filled portion of the actuator chamber. Because the actuator is arranged here in the second fuel-free region of the actuator chamber, a cost-effective electromagnetic actuator can be used, which can achieve the desired highly dynamic switching times. Furthermore, the advantageous use of special soft magnetic materials in the actuator is possible because the actuator components are not exposed to any corrosive effect of the fuel.
Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The dependent claims show preferred developments of the invention.
Gemäß einer weiteren bevorzugten Ausgestaltung der Erfindung ist der Druckausgleichskolben mit geringem Spiel in einer zylindrischen Bohrung eines Ventilkörpers verschiebbar angeordnet und mit einem Dichtspalt versehen. Dadurch kann eine einfache und betriebssichere Reduzierung des im Druckraum anliegenden Kraftstoffdrucks zum angrenzenden ersten Bereich des Aktorraums erreicht werden.According to a further preferred embodiment of the invention, the pressure compensation piston is slidably disposed with little play in a cylindrical bore of a valve body and provided with a sealing gap. As a result, a simple and reliable reduction of the fuel pressure applied in the pressure chamber to the adjacent first region of the actuator chamber can be achieved.
Vorzugsweise weist die erfindungsgemäße Vorrichtung eine Kraftstoff- Rücklaufleitung vom ersten Bereich des Aktorraums zu einem Kraftstoff-The device according to the invention preferably has a fuel return line from the first region of the actuator chamber to a fuel
Vorratsbehälter auf. Hierdurch liegt im ersten kraftstoffgefüllten Bereich des Aktorraums im Wesentlichen der im Kraftstoff-Vorratsbehälter vorliegende Umgebungsdruck an, der auch auf die diesem Bereich zugewandte Seite der Membran einwirkt.Reservoir on. As a result, in the first fuel-filled region of the actuator chamber, substantially the ambient pressure present in the fuel reservoir is present, which also acts on the side of the diaphragm facing this region.
Da vorteilhafterweise auch im zweiten kraftstofffreien Bereich des Aktorraums und somit auf der anderen Membranseite lediglich Umgebungsdruck herrscht, kann aufgrund einer nicht vorhandenen bzw. nur geringen Druckbelastung eine einfache und kostengünstige, insbesondere dünne Ausführung der Membran eingesetzt werden. Weiterhin bevorzugt ist am aktorseitigen Teil der Ventilnadel ein Anker angeordnet. Hierdurch wird ein einfacher, und kostengünstiger Aufbau des Aktors mit einer minimierten Anzahl von Bauteilen und kompaktem Einbauvolumen erreicht.Since advantageously also in the second fuel-free region of the actuator chamber and thus on the other side of the membrane only ambient pressure prevails, can be used due to a non-existent or low pressure load a simple and inexpensive, especially thin design of the membrane. Further preferably, an armature is arranged on the actuator-side part of the valve needle. As a result, a simple, cost-effective construction of the actuator is achieved with a minimized number of components and compact installation volume.
Gemäß einer weiteren bevorzugten Ausgestaltung der Erfindung umfasst der Aktor eine Freiwegfeder, deren Federkraft so ausgelegt ist, dass der aktorseitige Teil der Ventilnadel auch bei nicht betätigtem Aktor immer an der Membran anliegt. Hierdurch werden eine übermäßige Beanspruchung und eine daraus resultierende verminderte Dauerhaltbarkeit der Membran vermieden und derAccording to a further preferred embodiment of the invention, the actuator comprises a Freiwegfeder whose spring force is designed so that the actuator-side part of the valve needle is always applied to the diaphragm even when not actuated actuator. As a result, excessive stress and a resulting reduced durability of the membrane can be avoided and the
Anker liegt in einer definierten Startposition.Anchor is in a defined starting position.
Vorzugsweise ist das Rückstellelement so ausgelegt, dass der einspritzseitige Teil der Ventilnadel auch bei nicht betätigtem Aktor, d. h. geschlossener Ventilnadel, immer an der Membran anliegt. Hierdurch werden ein Abheben desPreferably, the return element is designed so that the injection-side part of the valve needle, even when not actuated actuator, d. H. closed valve needle, always applied to the membrane. This will lift the
Druckausgleichskolbens an der Membran und eine Stoßbeanspruchung auf die Membran vermieden, was wiederum zu einer erhöhten Haltbarkeit bzw. Lebensdauer der Membran beiträgt. Besonders bevorzugt liegen in jedem Betriebszustand der Einspritzvorrichtung der aktorseitige und der einspritzseitige Teil immer an der Membran an.Pressure compensation piston on the membrane and a shock load on the membrane avoided, which in turn contributes to increased durability and life of the membrane. Particularly preferably, the actuator-side and the injection-side part are always in contact with the membrane in each operating state of the injection device.
Gemäß einer weiteren bevorzugten Ausgestaltung der Erfindung ist der einspritzseitige Teil der Ventilnadel zweiteilig mit einer Nadel und dem Druckausgleichskolben ausgebildet. Hierdurch wird die separate Fertigung und Bearbeitung dieser Bauteile mit den jeweils erforderlichen Maßtoleranzen ermöglicht, was zu einer weiteren Kostenersparnis beiträgt.According to a further preferred embodiment of the invention, the injection-side part of the valve needle is formed in two parts with a needle and the pressure compensation piston. As a result, the separate production and processing of these components with the respective required dimensional tolerances is possible, which contributes to a further cost savings.
Vorzugsweise sind ein der Membran zugewandtes Ende des Druckausgleichskolbens und ein der Membran zugewandtes Ende des aktorseitigen Teils der Ventilnadel jeweils abgerundet ausgebildet. Hierdurch wird eine homogene Auflage dieser Enden insbesondere in einem verschobenen, d. h. ausgebeulten Zustand der Membran sichergestellt und eine Beschädigung der Membran, z. B. durch scharfe Kanten von nicht abgerundeten Endbereichen des Druckausgleichskolbens und des aktorseitigen Teils der Ventilnadel, vermieden.Preferably, a membrane-facing end of the pressure-compensating piston and a membrane facing the end of the actuator-side part of the valve needle are each formed rounded. As a result, a homogeneous edition of these ends, in particular in a shifted, d. H. bagged state of the membrane ensured and damage the membrane, z. B. by sharp edges of non-rounded end portions of the pressure compensating piston and the actuator-side part of the valve needle avoided.
Kurze Beschreibung der Zeichnung Nachfolgend wird ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die begleitende Zeichnung im Detail beschrieben. In der Zeichnung ist:Short description of the drawing Hereinafter, an embodiment of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:
Figur 1 eine schematisch vereinfachte Schnittdarstellung einesFigure 1 is a schematically simplified sectional view of a
Ausführungsbeispiels der erfindungsgemäßen VorrichtungEmbodiment of the device according to the invention
Ausführungsform der ErfindungEmbodiment of the invention
Nachfolgend wird unter Bezugnahme von Figur 1 eine Vorrichtung zum Einspritzen von Kraftstoff gemäß einem bevorzugten Ausführungsbeispiel der Erfindung im Detail beschrieben.Hereinafter, with reference to Figure 1, a device for injecting fuel according to a preferred embodiment of the invention will be described in detail.
Wie aus der schematischen Schnittdarstellung von Figur 1 ersichtlich, umfasst die Vorrichtung 1 zum Einspritzen von Kraftstoff einen Ventilkörper 2 sowie eine nach außen öffnende Ventilnadel 3, die aus einem einspritzseitigen Teil 3a und einem aktorseitigen Teil 3b gebildet ist. Der einspritzseitige Teil 3a der Ventilnadel 3 umfasst eine Nadel 31 und einen Druckausgleichskolben 10, die in einem Druckraum 4 angeordnet sind, dem Kraftstoff über eine Zulaufleitung 19 unter Druck zugeführt wird. Der Druckausgleichskolben 10 ist in einer zylindrischen Bohrung 16 des Ventilkörpers 2 mit geringem Spiel verschiebbar angeordnet.As can be seen from the schematic sectional illustration of FIG. 1, the device 1 for injecting fuel comprises a valve body 2 and an outwardly opening valve needle 3, which is formed from an injection-side part 3a and an actuator-side part 3b. The injection-side part 3a of the valve needle 3 comprises a needle 31 and a pressure compensation piston 10, which are arranged in a pressure chamber 4, the fuel is supplied via a supply line 19 under pressure. The pressure compensation piston 10 is slidably disposed in a cylindrical bore 16 of the valve body 2 with little play.
Im Druckraum 4 ist ferner ein Rückstellelement 20 angeordnet, das sich zwischen dem Ventilkörper 2 und der der Nadel 31 abstützt und die Ventilnadel 3 nach der Betätigung in eine Ausgangsposition zurückführt.In the pressure chamber 4, a return element 20 is further arranged, which is supported between the valve body 2 and the needle 31 and the valve needle 3 returns to an initial position after actuation.
In einem Aktorraum 9 ist ein elektromagnetischer Aktor 6 angeordnet, der eine Spule 8 und einen Anker 7, vorzugsweise vom Typ eines hier dargestelltenIn an actuator chamber 9, an electromagnetic actuator 6 is arranged, which comprises a coil 8 and an armature 7, preferably of the type of one shown here
Flachankers, umfasst, der am aktorseitigen Teil 3b der Ventilnadel 3 befestigt ist.Flat anchor, comprises, which is attached to the actuator-side part 3b of the valve needle 3.
Im Aktorraum 9 ist ferner eine Membran 13 angeordnet, die am Ventilkörper 2 befestigt ist und einerseits die Ventilnadel 3 in den einspritzseitigen Teil 3a und den aktorseitigen Teil 3b unterteilt, sowie andererseits den Aktorraum 9 in einen ersten kraftstoff gefüllten Bereich 5 und einen zweiten kraftstofffreien Bereich 18 fluiddicht unterteilt. Der erste Bereich 5 des Aktorraums 9 ist zumindest teilweise mit Kraftstoff gefüllt, der über einen auf der Oberfläche des Druckausgleichskolbens 10 ausgebildeten Dichtspalt 17 infolge des höheren Drucks vom Druckraum 4 in den ersten kraftstoffgefüllten Bereich 5 eintritt.In the actuator chamber 9, a diaphragm 13 is further arranged, which is attached to the valve body 2 and on the one hand the valve needle 3 divided into the injection-side part 3a and the actuator-side part 3b, and on the other hand, the actuator chamber 9 in a first fuel-filled region 5 and a second fuel-free region 18 divided fluid-tight. The first region 5 of the actuator chamber 9 is at least partially filled with fuel which enters the first fuel-filled region 5 via a sealing gap 17 formed on the surface of the pressure-compensating piston 10 as a result of the higher pressure from the pressure chamber 4.
Wie aus der Figur 1 ferner ersichtlich ist, sind ein der Membran 13 zugewandtes Ende 10a des Druckausgleichskolbens 10 und ein der Membran 13 zugewandtes Ende 15 des aktorseitigen Teils 3b der Ventilnadel 3 jeweils abgerundet ausgebildet. Dadurch werden Beschädigungen der Membran 13 verhindert, die durch ggf. ausgebildete Absätze oder Kanten auf den Endbereichen dieserAs can also be seen from FIG. 1, an end 10a of the pressure-compensating piston 10 facing the diaphragm 13 and an end 15 of the actuator-side part 3b of the valve needle 3 facing the diaphragm 13 are in each case rounded. As a result, damage to the membrane 13 can be prevented by the possibly formed paragraphs or edges on the end of this
Bauteile beim Verschieben bzw. Ausbeulen der Membran 13 während der Betätigung der Vorrichtung 1 verursacht werden würden.Components would be caused when moving or buckling of the membrane 13 during operation of the device 1.
Wie in Figur 1 dargestellt, zweigt eine Kraftstoff-Rücklaufleitung 14 aus dem ersten kraftstoff gefüllten Bereich 5 des Aktorraums 9 ab. Durch diese Kraftstoff-As shown in FIG. 1, a fuel return line 14 branches off from the first fuel-filled region 5 of the actuator chamber 9. Through this fuel
Rücklaufleitung 14 wird der Kraftstoff in einen hier nicht dargestellten Kraftstoff- Vorratsbehälter zurückgeführt, der sich durch den Dichtspalt 17 des Druckausgleichskolbens 10 infolge des Druckabbaus vom Druckraum 4 zum ersten Bereich 5 ansammelt. Da im Kraftstoff-Vorratsbehälter und demzufolge auch im ersten Bereich 5 des Aktorraums 9 Umgebungsdruck herrscht, erfolgt die Kraftstoff-Rückführung aus dem ersten kraftstoffgefüllten Bereich 5 des Aktorraums 9 in den Kraftstoff-Vorratsbehälter drucklos. Da im zweiten kraftstofffreien Bereich 18 des Aktorraums 9 ebenfalls Umgebungsdruck herrscht, liegt auf beiden Seiten der Membran 13 im Wesentlichen der gleiche Druck an. Somit herrscht an der Membran 13 ein Druckgleichgewicht.Return line 14, the fuel is returned to a fuel reservoir, not shown here, which accumulates through the sealing gap 17 of the pressure compensation piston 10 due to the pressure reduction from the pressure chamber 4 to the first region 5. Since there is ambient pressure in the fuel storage container and consequently also in the first region 5 of the actuator chamber 9, the fuel return from the first fuel-filled region 5 of the actuator chamber 9 takes place without pressure in the fuel reservoir. Since there is also ambient pressure in the second fuel-free region 18 of the actuator chamber 9, essentially the same pressure is applied to both sides of the membrane 13. Thus, there is a pressure equilibrium on the membrane 13.
Im Aktorraum 9 ist ferner eine Freiwegfeder 12 zwischen dem Anker 7 und einem Abschlusselement 21 angeordnet und stützt das aktorseitige Teil 3b der Ventilfeder 3 mit dem daran fixierten Anker 7 an einem Abschlusselement 21 ab. Eine elektrische Anschlussleitung 22 für den Aktor 6 ist durch dasIn the actuator chamber 9, a free-return spring 12 is further arranged between the armature 7 and a closing element 21 and supports the actuator-side part 3b of the valve spring 3 with the armature 7 fixed thereto at a closing element 21. An electrical connection line 22 for the actuator 6 is through the
Abschlusselement 21 hindurch nach außen geführt. Die Freiwegfeder 12 ist so ausgelegt, dass der aktorseitige Teil 3b der Ventilfeder 3 auch bei nicht betätigtem Aktor 6 an der Membran 13 anliegt. Darüber hinaus ist die Geometrie so ausgelegt, dass der einspritzseitige Teil 3a der Ventilnadel 3 auch bei nicht betätigtem Aktor 6 (geschlossene Ventilnadel) an der Membran 13 anliegt. Durch das beidseitige Anliegen der aktorseitigen und einspritzseitigen Teile 3a, 3b der Ventilnadel 3 in jedem Betriebszustand wird eine quasi starre Bauteilekombination der erfindungsgemäßen Vorrichtung 1 zur Betätigung der Ventilnadel 3 erreicht. Hierbei kann ein nach dem Zusammenbau ggf. vorhandener geringer radialer Versatz oder ein geringer Winkelversatz an der Membran 13 zwischen den aktorseitigen und einspritzseitigen Teilen 3a, 3b derEnd element 21 passed through to the outside. The freewheeling spring 12 is designed so that the actuator-side part 3b of the valve spring 3 rests against the diaphragm 13 even when the actuator 6 is not actuated. In addition, the geometry is designed so that the injection-side part 3a of the valve needle 3 rests against the diaphragm 13 even when the actuator 6 is not actuated (closed valve needle). Due to the two-sided concern of the actuator-side and injection-side parts 3a, 3b of Valve needle 3 in each operating state, a quasi-rigid component combination of the device 1 according to the invention for actuating the valve needle 3 is achieved. In this case, a small radial offset or a small angular offset on the diaphragm 13 between the actuator-side and injection-side parts 3a, 3b, if present after assembly, may be present
Ventilnadel 3 toleriert werden, da dieser keinen Einfluss auf die einwandfreie und betriebssichere Funktion der erfindungsgemäßen Vorrichtung 1 hat.Valve needle 3 are tolerated, since this has no effect on the proper and reliable operation of the device 1 according to the invention.
Durch die oben beschriebene Anordnung und Auslegung der einzelnen Bauteile ist eine hinsichtlich der Maß- und Lagetoleranzen einfachere und schnellereDue to the above-described arrangement and design of the individual components is a simpler and faster in terms of dimensional and position tolerances
Fertigung erreichbar, da der Aktor 6 mit dem aktorseitigen Teil 3b der VentilnadelManufacture achievable, since the actuator 6 with the actuator-side part 3b of the valve needle
3 und der einspritzseitige Teil 3a der Ventilnadel 3 mit dem umgebenden3 and the injection-side part 3a of the valve needle 3 with the surrounding
Ventilkörper 2 getrennt voneinander hergestellt und geprüft werden können.Valve body 2 can be made separately and tested separately.
Dies hat sowohl einen insgesamt geringeren Prüf- und Fertigungsaufwand als auch ein geringeres Risiko von Ausschussteilen zur Folge und trägt zu einer beachtlichen Kostenersparnis bei den Herstellkosten dieserThis results both in a lower overall testing and production cost and a lower risk of rejects result and contributes to a considerable cost savings in the cost of these
Hochdruckeinspritzventile bei. High-pressure injectors at.

Claims

Ansprüche claims
1. Vorrichtung zum Einspritzen von Kraftstoff, umfassend1. A device for injecting fuel, comprising
- einen Ventilkörper (2),a valve body (2),
- eine nach außen öffnende Ventilnadel (3), welche im Ventilkörper (2) in einem mit Kraftstoff gefüllten Druckraum (4) angeordnet ist, dem- An outwardly opening valve needle (3), which in the valve body (2) in a fuel-filled pressure chamber (4) is arranged, the
Kraftstoff unter Druck zugeführt wird,Fuel is supplied under pressure,
- ein Rückstellelement (20), welches die Ventilnadel (3) in eine Ausgangsposition zurückführt,a return element (20) which returns the valve needle (3) to a starting position,
- einen elektromagnetischen Aktor (6), der in einem Aktorraum (9) angeordnet ist, um die Ventilnadel (3) zu betätigen, und- An electromagnetic actuator (6) which is arranged in an actuator chamber (9) to actuate the valve needle (3), and
- eine Membran (13), die im Aktorraum (9) angeordnet ist und den Aktorraum (9) in einen ersten kraftstoff gefüllten Bereich (5) und einen zweiten kraftstofffreien Bereich (18) fluiddicht unterteilt, und die Ventilnadel (3) in einen einspritzseitigen Teil (3a) und einen aktorseitigen Teil (3b) unterteilt,- A membrane (13) which is arranged in the actuator chamber (9) and the actuator chamber (9) in a first fuel-filled region (5) and a second fuel-free region (18) fluid-tight divided, and the valve needle (3) in a injection-side Divided part (3a) and an actuator-side part (3b),
- wobei der einspritzseitige Teil (3a) der Ventilnadel (3) einen Druckausgleichskolben (10) umfasst, der den Druckraum (4) von dem ersten kraftstoff gefüllten Bereich (5) des Aktorraums (9) trennt, und wobei der Aktor (6) im zweiten kraftstofffreien Bereich (18) angeordnet ist.- wherein the injection-side part (3a) of the valve needle (3) comprises a pressure compensation piston (10) which separates the pressure chamber (4) from the first fuel-filled region (5) of the actuator chamber (9), and wherein the actuator (6) second fuel-free region (18) is arranged.
2. Vorrichtung zum Einspritzen von Kraftstoff nach Anspruch 1 , dadurch gekennzeichnet, dass der Druckausgleichskolben (10) in einer zylindrischen Bohrung (16) des Ventilkörpers (2) mit geringem Spiel angeordnet ist und einen Dichtspalt (17) zum Abbau des Drucks vom Druckraum (4) zum ersten Bereich (5) des Aktorraums (9) aufweist.2. A device for injecting fuel according to claim 1, characterized in that the pressure compensation piston (10) in a cylindrical bore (16) of the valve body (2) is arranged with little clearance and a sealing gap (17) for reducing the pressure from the pressure chamber ( 4) to the first region (5) of the actuator chamber (9).
3. Vorrichtung zum Einspritzen von Kraftstoff nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass eine Kraftstoff-Rücklaufleitung (14) vom ersten Bereich (5) des Aktorraums (9) zu einem Kraftstoff-Vorratsbehälter abzweigt. 3. A device for injecting fuel according to claim 1 or 2, characterized in that a fuel return line (14) branches off from the first region (5) of the actuator chamber (9) to a fuel reservoir.
4. Vorrichtung zum Einspritzen von Kraftstoff nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass auf beiden Seiten der Membran (13) im ersten kraftstoffgefüllten Bereich (5) und im zweiten kraftstofffreien Bereich (18) der gleiche oder im Wesentlichen der gleiche Druck anliegt.4. An apparatus for injecting fuel according to any one of the preceding claims, characterized in that on both sides of the membrane (13) in the first fuel-filled region (5) and in the second fuel-free region (18) bears the same or substantially the same pressure.
5. Vorrichtung zum Einspritzen von Kraftstoff nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Anker (7) am aktorseitigen Teil (3b) der Ventilnadel (3) angeordnet ist.5. An apparatus for injecting fuel according to one of the preceding claims, characterized in that an armature (7) on the actuator-side part (3b) of the valve needle (3) is arranged.
6. Vorrichtung zum Einspritzen von Kraftstoff nach einem der vorhergehenden6. A device for injecting fuel according to one of the preceding
Ansprüche, dadurch gekennzeichnet, dass der Aktor (6) ferner eine Freiwegfeder (12) umfasst, welche so ausgelegt ist, dass der aktorseitige Teil (3b) der Ventilnadel (3) auch bei nicht betätigtem Aktor (6) an der Membran (13) anliegt.Claims, characterized in that the actuator (6) further comprises a Freiwegfeder (12) which is designed so that the actuator-side part (3b) of the valve needle (3) even when not actuated actuator (6) on the membrane (13) is applied.
7. Vorrichtung zum Einspritzen von Kraftstoff nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Rückstellelement (20) so ausgelegt ist, dass der einspritzseitige Teil (3a) der Ventilnadel (3) auch bei nicht betätigtem Aktor (6) an der Membran (13) anliegt.7. A device for injecting fuel according to one of the preceding claims, characterized in that the return element (20) is designed so that the injection-side part (3a) of the valve needle (3) even when not actuated actuator (6) on the membrane ( 13) is applied.
8. Vorrichtung zum Einspritzen von Kraftstoff nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der einspritzseitige Teil (3a) der Ventilnadel (3) zweiteilig mit einer Nadel (31 ) und dem Druckausgleichskolben (10) gebildet ist.8. A device for injecting fuel according to one of the preceding claims, characterized in that the injection-side part (3a) of the valve needle (3) is formed in two parts with a needle (31) and the pressure equalizing piston (10).
9. Vorrichtung zum Einspritzen von Kraftstoff nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Druckausgleichskolben (10) ein der Membran (13) zugewandtes abgerundetes Ende (10a) und der aktorseitige Teil (3b) der Ventilnadel (3) ein der Membran (13) zugewandtes abgerundetes Ende (15) aufweisen. 9. A device for injecting fuel according to one of the preceding claims, characterized in that the pressure equalizing piston (10) one of the membrane (13) facing the rounded end (10 a) and the actuator-side part (3b) of the valve needle (3) one of the membrane ( 13) facing the rounded end (15).
EP10707271.2A 2009-05-06 2010-03-05 Device for injecting fuel Not-in-force EP2427649B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009002840A DE102009002840A1 (en) 2009-05-06 2009-05-06 Device for injecting fuel
PCT/EP2010/052814 WO2010127887A1 (en) 2009-05-06 2010-03-05 Device for injecting fuel

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EP2427649A1 true EP2427649A1 (en) 2012-03-14
EP2427649B1 EP2427649B1 (en) 2013-07-17

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US (1) US8960573B2 (en)
EP (1) EP2427649B1 (en)
JP (1) JP5490222B2 (en)
KR (1) KR101711851B1 (en)
CN (1) CN102414431B (en)
BR (1) BRPI1011824A2 (en)
DE (1) DE102009002840A1 (en)
ES (1) ES2424089T3 (en)
RU (1) RU2538146C2 (en)
WO (1) WO2010127887A1 (en)

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CN105370468B (en) * 2015-12-11 2017-09-29 中国北方发动机研究所(天津) Fuel injector pressure-control valve
DE102018212665A1 (en) * 2018-07-30 2020-01-30 Robert Bosch Gmbh Piston pump and fuel delivery device for cryogenic fuels

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Publication number Publication date
US8960573B2 (en) 2015-02-24
US20120074245A1 (en) 2012-03-29
RU2011149359A (en) 2013-06-20
JP5490222B2 (en) 2014-05-14
EP2427649B1 (en) 2013-07-17
KR20120014139A (en) 2012-02-16
CN102414431B (en) 2014-05-07
JP2012526226A (en) 2012-10-25
KR101711851B1 (en) 2017-03-03
RU2538146C2 (en) 2015-01-10
DE102009002840A1 (en) 2010-11-11
BRPI1011824A2 (en) 2016-03-22
CN102414431A (en) 2012-04-11
WO2010127887A1 (en) 2010-11-11
ES2424089T3 (en) 2013-09-27

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