EP2146085B1 - Fuel injection valve device - Google Patents

Fuel injection valve device Download PDF

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Publication number
EP2146085B1
EP2146085B1 EP09100284.0A EP09100284A EP2146085B1 EP 2146085 B1 EP2146085 B1 EP 2146085B1 EP 09100284 A EP09100284 A EP 09100284A EP 2146085 B1 EP2146085 B1 EP 2146085B1
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EP
European Patent Office
Prior art keywords
valve piston
pressure
fuel injection
control space
valve device
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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.)
Not-in-force
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EP09100284.0A
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German (de)
French (fr)
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EP2146085A1 (en
Inventor
Andreas Gruenberger
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2146085A1 publication Critical patent/EP2146085A1/en
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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
    • 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
    • F02M47/027—Electrically actuated valves draining the chamber to release the 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0073—Pressure balanced valves

Definitions

  • the invention relates to a fuel injection valve device with a nozzle needle, which controls the opening of at least one injection opening by its longitudinal movement, and with a control chamber whose control chamber pressure acts at least indirectly on the nozzle needle and a reciprocating valve piston.
  • an injector with a control valve which has an axially pressure compensated valve piston (36) which is longitudinally movable by a magnetic actuator and thus affects the pressure in a control chamber.
  • the object of the invention is to provide a fuel injection valve device according to the preamble of claim 1, which is inexpensive to produce and has a long service life.
  • a fuel injection valve device with a nozzle needle, which controls the opening of at least one injection port by its longitudinal movement, and with a control chamber whose control chamber pressure acts at least indirectly on the nozzle needle and a reciprocable valve piston, achieved in that the valve piston two in Movement direction of the valve piston facing away from each other control pressure surfaces which are acted upon by the control chamber pressure.
  • a control pressure surface can be deliberately chosen to be slightly smaller in order to support the closing movement of the valve piston hydraulically.
  • a hydraulic sealing assistance or pressure support can be realized, which depends on the pressure in a central high-pressure fuel storage. By the sealing support or pressure support, the biasing force of a spring can be reduced, which serves to reset the valve piston in its closed position.
  • a preferred embodiment of the fuel injection valve device is characterized in that the valve piston has a shoulder on which one of the control pressure surfaces is formed.
  • This control pressure surface has essentially the shape of a circular disk.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the control pressure surface formed on the valve piston shoulder is arranged radially within a valve seat diameter.
  • a sealing surface or a sealing edge is provided on the valve piston paragraph, which cooperates with a sealing edge or sealing surface which is provided on a housing body of the fuel injection valve device. Through the interaction of sealing surface and sealing edge a sealing seat is created, which depends on the position the valve piston is open or closed. When the seal seat is opened, the control room pressure in the control room is released into a pressure relief space.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the control pressure surface formed on the valve piston shoulder defines a first partial control chamber.
  • the first partial control chamber is preferably designed as an annular space in a housing body of the fuel injection valve device.
  • the annular space is bounded radially inwardly by the valve piston.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the first partial control chamber communicates with a second partial control chamber, which is delimited by a sealing sleeve at one end of the valve piston.
  • the sealing sleeve is preferably arranged on the combustion chamber near the end of the valve piston.
  • a communication passage preferably extends through the valve piston end to connect the first to the second sub-control space.
  • a further preferred embodiment of the fuel injection valve device is characterized in that the end of the valve piston is arranged with the sealing sleeve in a pressure relief space.
  • the pressure relief space is preferably in communication with a return of the fuel injection valve device.
  • a further preferred embodiment of the fuel injection valve device is characterized in that the second control pressure surface is formed at the end of the valve piston.
  • the second control pressure surface is preferably arranged as a circular surface radially inside the sealing sleeve.
  • Another preferred embodiment of the fuel injection valve device is characterized in that the sealing sleeve is guided on a housing-fixed guide pin to and fro movable.
  • the sealing sleeve is preferably held by the already mentioned spring in sealing contact with the combustion chamber near the end of the valve piston with the second control pressure surface.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the guide pin comprises a connecting channel which connects the second partial control chamber to a third partial control chamber.
  • the connecting channel may be provided an outlet throttle.
  • the three sub-control rooms form together with the connecting channel or with the connecting channels the control room.
  • a further preferred exemplary embodiment of the fuel injection valve device is characterized in that the third partial control chamber is delimited by one end of the nozzle needle.
  • the nozzle needle may be one or more parts.
  • the third partial control chamber is preferably delimited by a further sealing sleeve which is remote from the combustion chamber End of the nozzle needle is guided back and forth movable.
  • FIG. 1 shows a section of a fuel injection valve device according to the invention in longitudinal section.
  • FIG. 1 a fuel injection valve device according to the invention with the fuel-supplying components is shown schematically in longitudinal section.
  • the fuel injection valve device comprises a holding body 1 and a nozzle body 2, in which a nozzle needle 3 is arranged longitudinally displaceable.
  • a nozzle needle tip 8 at the combustion chamber near the end of the nozzle needle 3 closes at least one injection opening 9, through which fuel from a pressure chamber is injected into a combustion chamber of an internal combustion engine, when the nozzle needle 3 opens.
  • a valve plate 4 and a throttle plate 5 are clamped between the holding body 1 and the nozzle body 2, a valve plate 4 and a throttle plate 5 are clamped.
  • the holding body 1, the nozzle body 2, the valve plate 4 and the throttle plate 5 together represent the housing of the fuel injection valve device, which is also referred to as an injector.
  • an inlet channel 10 which comprises three inlet channel sections 11, 12 and 13
  • high-pressure fuel passes from a central high-pressure fuel accumulator, which is also referred to as a rail, into a longitudinal bore 15 which is provided in the nozzle body 2.
  • a guide bore 18 is provided in the valve plate 4.
  • a valve piston 20 is guided to and fro movable.
  • the valve piston 20 has at its combustion chamber near end 22 a shoulder 24, which includes a first control pressure surface 26.
  • the first control pressure surface 26 has essentially the shape of a circular disk, which limits a first partial control chamber 31 of a control chamber 30 in the axial direction.
  • the first partial control chamber 31 is designed as an annular space in the valve plate 4 and is bounded radially inwardly by the valve piston 20.
  • the control chamber 30 comprises, in addition to the first partial control chamber 31, a second partial control chamber 32 and a third partial control chamber 33.
  • the first control pressure surface 26 is bounded radially outwardly by a valve seat diameter 35.
  • the valve seat diameter 35 defines a valve seat, which is formed by a sealing edge, which cooperates with a sealing surface.
  • the sealing edge may be provided on the valve piston 20 or on the valve plate 4.
  • the associated Sealing surface may be provided on the valve plate 4 or on the valve piston 20.
  • the first partial control chamber 31 communicates via a connecting channel 38 with the second partial control chamber 32 in connection.
  • the connecting channel 38 comprises at least one transverse bore and a longitudinal bore in the combustion chamber near end 22 of the valve piston 20.
  • the second part control chamber 32 is bounded in the radial direction by a sealing sleeve 40 which held by a compression spring 42 in sealing engagement with the combustion chamber near end 22 of the valve piston 20 becomes.
  • the limited by a sealing edge of the sealing sleeve 40 at the combustion chamber remote end 22 of the valve piston 20 surface represented a second control pressure surface 43, which faces the combustion chamber and the first control pressure surface 26 faces away.
  • the combustion chamber near end 22 of the valve piston 20 protrudes into a pressure relief space 44, in which the sealing sleeve 40 and the associated compression spring 42 are arranged.
  • the pressure relief chamber 44 is connected via a return passage 45 with a return of the fuel injection valve device in connection.
  • the sealing sleeve 40 is guided on a guide pin 46 movable back and forth, which starts from the throttle plate 5.
  • the guide mandrel 46 comprises a further connecting channel 48, which may contain an outlet throttle and connects the second partial control chamber 32 with the third partial control chamber 33.
  • the third partial control chamber 33 is connected via an inlet throttle channel 50 with the inlet channel 10 in connection. In the radial direction, the third part control chamber 33 is bounded by a further sealing sleeve 54, which is held by the biasing force of a nozzle needle spring 56 in sealing engagement with the throttle plate 5.
  • the pressure in the (not shown) central high-pressure fuel storage is also referred to as rail pressure or high pressure.
  • the inlet channel 12 and the inlet throttle channel 50 receives high-pressure fuel in the first part of control chamber 31.
  • About the connecting channel 48 of the high-pressure fuel into the second part control chamber 32 passes through the connecting channel 38 is supplied with high pressure fuel into the third part control chamber 31st
  • all three sub-control rooms 31 to 33 are subjected to high pressure.
  • valve piston 20 is pressure balanced. If the second control pressure surface 43 is slightly larger than the first control pressure surface 26, then the closing movement of the valve piston 20 is hydraulically assisted.
  • valve piston 20 When the valve piston 20 is actuated by means of an actuator (not shown), in particular a piezoelectric actuator is energized, then the valve piston 20 moves downward, so that at the valve seat diameter 35, a connection between the first part control chamber 31 and the pressure relief chamber 44 is released. As a result of the pressure decrease in the first partial control chamber 31, the control chamber pressure also drops in the second part control room 32 and the third part control room 33 from.
  • an actuator not shown
  • a piezoelectric actuator is energized

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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 eine Kraftstoffeinspritzventileinrichtung mit einer Düsennadel, die durch ihre Längsbewegung die Öffnung wenigstens einer Einspritzöffnung steuert, und mit einem Steuerraum, dessen Steuerraumdruck wenigstens mittelbar auf die Düsennadel und einen hin und her bewegbaren Ventilkolben wirkt.The invention relates to a fuel injection valve device with a nozzle needle, which controls the opening of at least one injection opening by its longitudinal movement, and with a control chamber whose control chamber pressure acts at least indirectly on the nozzle needle and a reciprocating valve piston.

Aus der DE 10 2006 050 032 A1 ist ein Injektor mit einem Steuerventil bekannt, der einen axial druckausgeglichenen Ventilkolben (36) aufweist, der durch einen Magnetaktor längsbewegbar ist und so den Druck in einer Steuerkammer beeinflusst.From the DE 10 2006 050 032 A1 an injector with a control valve is known, which has an axially pressure compensated valve piston (36) which is longitudinally movable by a magnetic actuator and thus affects the pressure in a control chamber.

Offenbarung der ErfindungDisclosure of the invention

Aufgabe der Erfindung ist es, eine Kraftstoffeinspritzventileinrichtung gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, die kostengünstig herstellbar ist und eine lange Lebensdauer aufweist.The object of the invention is to provide a fuel injection valve device according to the preamble of claim 1, which is inexpensive to produce and has a long service life.

Die Aufgabe ist bei einer Kraftstoffeinspritzventileinrichtung mit einer Düsennadel, die durch ihre Längsbewegung die Öffnung wenigstens einer Einspritzöffnung steuert, und mit einem Steuerraum, dessen Steuerraumdruck wenigstens mittelbar auf die Düsennadel und einen hin und her bewegbaren Ventilkolben wirkt, dadurch gelöst, dass der Ventilkolben zwei in Bewegungsrichtung des Ventilkolbens voneinander abgewandte Steuerdruckflächen aufweist, die mit dem Steuerraumdruck beaufschlagt sind. Dadurch wird auf einfache Art und Weise ein Druckausgleich an dem Ventilkolben ermöglicht, wenn die beiden Steuerdruckflächen die gleiche Größe aufweisen. Darüber hinaus kann auch eine Steuerdruckfläche bewusst etwas kleiner gewählt werden, um die Schließbewegung des Ventilkolbens hydraulisch zu unterstützen. Des Weiteren kann eine hydraulische Dichtunterstützung oder Druckunterstützung realisiert werden, die von dem Druck in einem zentralen Kraftstoffhochdruckspeicher abhängt. Durch die Dichtunterstützung oder Druckunterstützung kann die Vorspannkraft einer Feder reduziert werden, die dazu dient, den Ventilkolben in seine Schließstellung zurückzustellen.The object is achieved in a fuel injection valve device with a nozzle needle, which controls the opening of at least one injection port by its longitudinal movement, and with a control chamber whose control chamber pressure acts at least indirectly on the nozzle needle and a reciprocable valve piston, achieved in that the valve piston two in Movement direction of the valve piston facing away from each other control pressure surfaces which are acted upon by the control chamber pressure. Thereby a pressure equalization is made possible on the valve piston in a simple manner when the two control pressure surfaces have the same size. In addition, a control pressure surface can be deliberately chosen to be slightly smaller in order to support the closing movement of the valve piston hydraulically. Furthermore, a hydraulic sealing assistance or pressure support can be realized, which depends on the pressure in a central high-pressure fuel storage. By the sealing support or pressure support, the biasing force of a spring can be reduced, which serves to reset the valve piston in its closed position.

Ein bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzventileinrichtung ist dadurch gekennzeichnet, dass der Ventilkolben einen Absatz aufweist, an dem eine der Steuerdruckflächen ausgebildet ist. Diese Steuerdruckfläche hat im Wesentlichen die Gestalt einer Kreisringscheibe.A preferred embodiment of the fuel injection valve device is characterized in that the valve piston has a shoulder on which one of the control pressure surfaces is formed. This control pressure surface has essentially the shape of a circular disk.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzventileinrichtung ist dadurch gekennzeichnet, dass die an dem Ventilkolbenabsatz ausgebildete Steuerdruckfläche radial innerhalb eines Ventilsitzdurchmessers angeordnet ist. Vorzugsweise ist an dem Ventilkolbenabsatz eine Dichtfläche oder eine Dichtkante vorgesehen, die mit einer Dichtkante oder Dichtfläche zusammenwirkt, die an einem Gehäusekörper der Kraftstoffeinspritzventileinrichtung vorgesehen ist. Durch das Zusammenwirken von Dichtfläche und Dichtkante wird ein Dichtsitz geschaffen, der in Abhängigkeit von der Stellung des Ventilkolbens geöffnet oder geschlossen ist. Wenn der Dichtsitz geöffnet ist, dann wird der Steuerraumdruck in dem Steuerraum in einen Druckentlastungsraum entspannt.A further preferred exemplary embodiment of the fuel injection valve device is characterized in that the control pressure surface formed on the valve piston shoulder is arranged radially within a valve seat diameter. Preferably, a sealing surface or a sealing edge is provided on the valve piston paragraph, which cooperates with a sealing edge or sealing surface which is provided on a housing body of the fuel injection valve device. Through the interaction of sealing surface and sealing edge a sealing seat is created, which depends on the position the valve piston is open or closed. When the seal seat is opened, the control room pressure in the control room is released into a pressure relief space.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzventileinrichtung ist dadurch gekennzeichnet, dass die an dem Ventilkolbenabsatz ausgebildete Steuerdruckfläche einen ersten Teilsteuerraum begrenzt. Der erste Teilsteuerraum ist vorzugsweise als Ringraum in einem Gehäusekörper der Kraftstoffeinspritzventileinrichtung ausgeführt. Der Ringraum wird radial innen von dem Ventilkolben begrenzt.A further preferred exemplary embodiment of the fuel injection valve device is characterized in that the control pressure surface formed on the valve piston shoulder defines a first partial control chamber. The first partial control chamber is preferably designed as an annular space in a housing body of the fuel injection valve device. The annular space is bounded radially inwardly by the valve piston.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzventileinrichtung ist dadurch gekennzeichnet, dass der erste Teilsteuerraum mit einem zweiten Teilsteuerraum in Verbindung steht, der an einem Ende des Ventilkolbens von einer Dichthülse begrenzt wird. Die Dichthülse ist vorzugsweise an dem brennraumnahen Ende des Ventilkolbens angeordnet. Ein Verbindungskanal erstreckt sich vorzugsweise durch das Ventilkolbenende, um den ersten mit dem zweiten Teilsteuerraum zu verbinden.A further preferred exemplary embodiment of the fuel injection valve device is characterized in that the first partial control chamber communicates with a second partial control chamber, which is delimited by a sealing sleeve at one end of the valve piston. The sealing sleeve is preferably arranged on the combustion chamber near the end of the valve piston. A communication passage preferably extends through the valve piston end to connect the first to the second sub-control space.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzventileinrichtung ist dadurch gekennzeichnet, dass das Ende des Ventilkolbens mit der Dichthülse in einem Druckentlastungsraum angeordnet ist. Der Druckentlastungsraum steht vorzugsweise mit einem Rücklauf der Kraftstoffeinspritzventileinrichtung in Verbindung.A further preferred embodiment of the fuel injection valve device is characterized in that the end of the valve piston is arranged with the sealing sleeve in a pressure relief space. The pressure relief space is preferably in communication with a return of the fuel injection valve device.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzventileinrichtung ist dadurch gekennzeichnet, dass die zweite Steuerdruckfläche an dem Ende des Ventilkolbens ausgebildet ist. Die zweite Steuerdruckfläche ist vorzugsweise als Kreisfläche radial innerhalb der Dichthülse angeordnet.A further preferred embodiment of the fuel injection valve device is characterized in that the second control pressure surface is formed at the end of the valve piston. The second control pressure surface is preferably arranged as a circular surface radially inside the sealing sleeve.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzventileinrichtung ist dadurch gekennzeichnet, dass die Dichthülse auf einem gehäusefesten Führungsdorn hin und her bewegbar geführt ist. Die Dichthülse wird vorzugsweise durch die bereits genannte Feder in dichtender Anlage an dem brennraumnahen Ende des Ventilkolbens mit der zweiten Steuerdruckfläche gehalten.Another preferred embodiment of the fuel injection valve device is characterized in that the sealing sleeve is guided on a housing-fixed guide pin to and fro movable. The sealing sleeve is preferably held by the already mentioned spring in sealing contact with the combustion chamber near the end of the valve piston with the second control pressure surface.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzventileinrichtung ist dadurch gekennzeichnet, dass der Führungsdorn einen Verbindungskanal umfasst, der den zweiten Teilsteuerraum mit einem dritten Teilsteuerraum verbindet. In dem Verbindungskanal kann eine Ablaufdrossel vorgesehen sein. Die drei Teilsteuerräume bilden zusammen mit dem Verbindungskanal beziehungsweise mit den Verbindungskanälen den Steuerraum.A further preferred exemplary embodiment of the fuel injection valve device is characterized in that the guide pin comprises a connecting channel which connects the second partial control chamber to a third partial control chamber. In the connecting channel may be provided an outlet throttle. The three sub-control rooms form together with the connecting channel or with the connecting channels the control room.

Ein weiteres bevorzugtes Ausführungsbeispiel der Kraftstoffeinspritzventileinrichtung ist dadurch gekennzeichnet, dass der dritte Teilsteuerraum von einem Ende der Düsennadel begrenzt wird. Die Düsennadel kann ein oder mehrteilig ausgeführt sein. Der dritte Teilsteuerraum wird vorzugsweise von einer weiteren Dichthülse begrenzt, die an dem brennraumfernen Ende der Düsennadel hin und her bewegbar geführt ist.A further preferred exemplary embodiment of the fuel injection valve device is characterized in that the third partial control chamber is delimited by one end of the nozzle needle. The nozzle needle may be one or more parts. The third partial control chamber is preferably delimited by a further sealing sleeve which is remote from the combustion chamber End of the nozzle needle is guided back and forth movable.

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.Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, an embodiment is described in detail.

Kurze Beschreibung der ZeichnungShort description of the drawing

Die einzige beiliegende Figur 1 zeigt einen Ausschnitt einer erfindungsgemäßen Kraftstoffeinspritzventileinrichtung im Längsschnitt.The only enclosed FIG. 1 shows a section of a fuel injection valve device according to the invention in longitudinal section.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist eine erfindungsgemäße Kraftstoffeinspritzventileinrichtung mit den Kraftstoff zuführenden Komponenten schematisch im Längsschnitt dargestellt. Die Kraftstoffeinspritzventileinrichtung umfasst einen Haltekörper 1 und einen Düsenkörper 2, in welchem eine Düsennadel 3 längs verschiebbar angeordnet ist. In Figur 1 sieht man das brennraumferne Ende der Düsennadel 3. Eine Düsennadelspitze 8 am brennraumnahen Ende der Düsennadel 3 verschließt mindestens eine Einspritzöffnung 9, durch welche Kraftstoff aus einem Druckraum in einen Brennraum einer Brennkraftmaschine eingespritzt wird, wenn die Düsennadel 3 öffnet.In FIG. 1 a fuel injection valve device according to the invention with the fuel-supplying components is shown schematically in longitudinal section. The fuel injection valve device comprises a holding body 1 and a nozzle body 2, in which a nozzle needle 3 is arranged longitudinally displaceable. In FIG. 1 A nozzle needle tip 8 at the combustion chamber near the end of the nozzle needle 3 closes at least one injection opening 9, through which fuel from a pressure chamber is injected into a combustion chamber of an internal combustion engine, when the nozzle needle 3 opens.

Zwischen dem Haltekörper 1 und dem Düsenkörper 2 sind eine Ventilplatte 4 und eine Drosselplatte 5 eingespannt. Der Haltekörper 1, der Düsenkörper 2, die Ventilplatte 4 und die Drosselplatte 5 stellen gemeinsam das Gehäuse der Kraftstoffeinspritzventileinrichtung dar, die auch als Injektor bezeichnet wird. Über einen Zulaufkanal 10, der drei Zulaufkanalabschnitte 11, 12 und 13 umfasst, gelangt mit Hochdruck beaufschlagter Kraftstoff aus einem zentralen Kraftstoffhochdruckspeicher, der auch als Rail bezeichnet wird, in eine Längsbohrung 15, die in dem Düsenkörper 2 vorgesehen ist.Between the holding body 1 and the nozzle body 2, a valve plate 4 and a throttle plate 5 are clamped. The holding body 1, the nozzle body 2, the valve plate 4 and the throttle plate 5 together represent the housing of the fuel injection valve device, which is also referred to as an injector. Via an inlet channel 10, which comprises three inlet channel sections 11, 12 and 13, high-pressure fuel passes from a central high-pressure fuel accumulator, which is also referred to as a rail, into a longitudinal bore 15 which is provided in the nozzle body 2.

Koaxial zu der Längsbohrung 15 ist eine Führungsbohrung 18 in der Ventilplatte 4 vorgesehen. In der Führungsbohrung 18 ist ein Ventilkolben 20 hin und her bewegbar geführt. Der Ventilkolben 20 weist an seinem brennraumnahen Ende 22 einen Absatz 24 auf, der eine erste Steuerdruckfläche 26 umfasst. Die erste Steuerdruckfläche 26 hat im Wesentlichen die Gestalt einer Kreisringsscheibe, die einen ersten Teilsteuerraum 31 eines Steuerraums 30 in axialer Richtung begrenzt. Der erste Teilsteuerraum 31 ist als Ringraum in der Ventilplatte 4 ausgeführt und wird radial innen von dem Ventilkolben 20 begrenzt. Der Steuerraum 30 umfasst neben dem ersten Teilsteuerraum 31 einen zweiten Teilsteuerraum 32 und einen dritten Teilsteuerraum 33.Coaxially with the longitudinal bore 15, a guide bore 18 is provided in the valve plate 4. In the guide bore 18, a valve piston 20 is guided to and fro movable. The valve piston 20 has at its combustion chamber near end 22 a shoulder 24, which includes a first control pressure surface 26. The first control pressure surface 26 has essentially the shape of a circular disk, which limits a first partial control chamber 31 of a control chamber 30 in the axial direction. The first partial control chamber 31 is designed as an annular space in the valve plate 4 and is bounded radially inwardly by the valve piston 20. The control chamber 30 comprises, in addition to the first partial control chamber 31, a second partial control chamber 32 and a third partial control chamber 33.

Die erste Steuerdruckfläche 26 wird radial außen von einem Ventilsitzdurchmesser 35 begrenzt. Der Ventilsitzdurchmesser 35 definiert einen Ventilsitz, der von einer Dichtkante gebildet wird, die mit einer Dichtfläche zusammenwirkt. Die Dichtkante kann an dem Ventilkolben 20 oder an der Ventilplatte 4 vorgesehen sein. Analog kann die zugehörige Dichtfläche an der Ventilplatte 4 oder an dem Ventilkolben 20 vorgesehen sein.The first control pressure surface 26 is bounded radially outwardly by a valve seat diameter 35. The valve seat diameter 35 defines a valve seat, which is formed by a sealing edge, which cooperates with a sealing surface. The sealing edge may be provided on the valve piston 20 or on the valve plate 4. Analogously, the associated Sealing surface may be provided on the valve plate 4 or on the valve piston 20.

Der erste Teilsteuerraum 31 steht über einen Verbindungskanal 38 mit dem zweiten Teilsteuerraum 32 in Verbindung. Der Verbindungskanal 38 umfasst mindestens eine Querbohrung und eine Längsbohrung in dem brennraumnahen Ende 22 des Ventilkolbens 20. Der zweite Teilsteuerraum 32 wird in radialer Richtung von einer Dichthülse 40 begrenzt, die durch eine Druckfeder 42 in dichtender Anlage an dem brennraumnahen Ende 22 des Ventilkolbens 20 gehalten wird.The first partial control chamber 31 communicates via a connecting channel 38 with the second partial control chamber 32 in connection. The connecting channel 38 comprises at least one transverse bore and a longitudinal bore in the combustion chamber near end 22 of the valve piston 20. The second part control chamber 32 is bounded in the radial direction by a sealing sleeve 40 which held by a compression spring 42 in sealing engagement with the combustion chamber near end 22 of the valve piston 20 becomes.

Die von einer Dichtkante der Dichthülse 40 an dem brennraumfernen Ende 22 des Ventilkolbens 20 begrenzte Fläche stellte eine zweite Steuerdruckfläche 43 dar, die dem Brennraum zugewandt und der ersten Steuerdruckfläche 26 abgewandt ist. Das brennraumnahe Ende 22 des Ventilkolbens 20 ragt in einen Druckentlastungsraum 44, in welchem auch die Dichthülse 40 und die zugehörige Druckfeder 42 angeordnet sind. Der Druckentlastungsraum 44 steht über einen Rücklaufkanal 45 mit einem Rücklauf der Kraftstoffeinspritzventileinrichtung in Verbindung.The limited by a sealing edge of the sealing sleeve 40 at the combustion chamber remote end 22 of the valve piston 20 surface represented a second control pressure surface 43, which faces the combustion chamber and the first control pressure surface 26 faces away. The combustion chamber near end 22 of the valve piston 20 protrudes into a pressure relief space 44, in which the sealing sleeve 40 and the associated compression spring 42 are arranged. The pressure relief chamber 44 is connected via a return passage 45 with a return of the fuel injection valve device in connection.

Die Dichthülse 40 ist auf einem Führungsdorn 46 hin und her bewegbar geführt, der von der Drosselplatte 5 ausgeht. Der Führungsdorn 46 umfasst einen weiteren Verbindungskanal 48, der eine Ablaufdrossel enthalten kann und den zweiten Teilsteuerraum 32 mit dem dritten Teilsteuerraum 33 verbindet. Der dritte Teilsteuerraum 33 steht über einen Zulaufdrosselkanal 50 mit dem Zulaufkanal 10 in Verbindung. In radialer Richtung wird der dritte Teilsteuerraum 33 von einer weiteren Dichthülse 54 begrenzt, die durch die Vorspannkraft einer Düsennadelfeder 56 in dichtender Anlage an der Drosselplatte 5 gehalten wird.The sealing sleeve 40 is guided on a guide pin 46 movable back and forth, which starts from the throttle plate 5. The guide mandrel 46 comprises a further connecting channel 48, which may contain an outlet throttle and connects the second partial control chamber 32 with the third partial control chamber 33. The third partial control chamber 33 is connected via an inlet throttle channel 50 with the inlet channel 10 in connection. In the radial direction, the third part control chamber 33 is bounded by a further sealing sleeve 54, which is held by the biasing force of a nozzle needle spring 56 in sealing engagement with the throttle plate 5.

Der Druck in dem (nicht dargestellten) zentralen Kraftstoffhochdruckspeicher wird auch als Raildruck oder Hochdruck bezeichnet. Durch den Zulaufkanal 12 und den Zulaufdrosselkanal 50 gelangt mit Hochdruck beaufschlagter Kraftstoff in den ersten Teilsteuerraum 31. Über den Verbindungskanal 48 gelangt der mit Hochdruck beaufschlagte Kraftstoff in den zweiten Teilsteuerraum 32. Über den Verbindungskanal 38 gelangt mit Hochdruck beaufschlagter Kraftstoff in den dritten Teilsteuerraum 31. Somit sind alle drei Teilsteuerräume 31 bis 33 mit Hochdruck beaufschlagt.The pressure in the (not shown) central high-pressure fuel storage is also referred to as rail pressure or high pressure. Through the inlet channel 12 and the inlet throttle channel 50 receives high-pressure fuel in the first part of control chamber 31. About the connecting channel 48 of the high-pressure fuel into the second part control chamber 32 passes through the connecting channel 38 is supplied with high pressure fuel into the third part control chamber 31st Thus, all three sub-control rooms 31 to 33 are subjected to high pressure.

Wenn die beiden Steuerdruckflächen 26 und 43 gleich groß sind, dann ist der Ventilkolben 20 druckausgeglichen. Wenn die zweite Steuerdruckfläche 43 etwas größer als die erste Steuerdruckfläche 26 ist, dann wird die Schließbewegung des Ventilkolbens 20 hydraulisch unterstützt.If the two control pressure surfaces 26 and 43 are the same size, then the valve piston 20 is pressure balanced. If the second control pressure surface 43 is slightly larger than the first control pressure surface 26, then the closing movement of the valve piston 20 is hydraulically assisted.

Wenn der Ventilkolben 20 mit Hilfe eines (nicht dargestellten) Aktors betätigt wird, insbesondere ein Piezoaktor bestromt wird, dann bewegt sich der Ventilkolben 20 nach unten, so dass an dem Ventilsitzdurchmesser 35 eine Verbindung zwischen dem ersten Teilsteuerraum 31 und dem Druckentlastungsraum 44 freigegeben wird. Durch die Druckabnahme in dem ersten Teilsteuerraum 31 fällt auch der Steuerraumdruck in dem zweiten Teilsteuerraum 32 und dem dritten Teilsteuerraum 33 ab.When the valve piston 20 is actuated by means of an actuator (not shown), in particular a piezoelectric actuator is energized, then the valve piston 20 moves downward, so that at the valve seat diameter 35, a connection between the first part control chamber 31 and the pressure relief chamber 44 is released. As a result of the pressure decrease in the first partial control chamber 31, the control chamber pressure also drops in the second part control room 32 and the third part control room 33 from.

Wenn der Druck in dem dritten Teilsteuerraum 33 abnimmt, dann bewegt sich die Düsennadel 3 auf die Drosselplatte 5 zu, so dass mit Hochdruck beaufschlagter Kraftstoff eingespritzt wird. Wenn die Ansteuerung des Aktors beendet wird, dann wird der Ventilkolben 20 durch die Vorspannkraft der Druckfeder 42 und das eingestellte Flächenverhältnis zwischen den Steuerdruckflächen 26, 43 geschlossen.When the pressure in the third sub-control chamber 33 decreases, then the nozzle needle 3 moves toward the throttle plate 5, so that high-pressure fuel is injected. When the drive of the actuator is terminated, the valve piston 20 is closed by the biasing force of the compression spring 42 and the set area ratio between the control pressure surfaces 26, 43.

Claims (4)

  1. Fuel injection valve device having a nozzle needle (3) which, by way of its longitudinal movement, controls the opening of at least one injection opening (9), and having a control space (30), the control space pressure of which acts at least indirectly on the nozzle needle (3) and a valve piston (20) which moves to and fro, the valve piston (20) having two control pressure faces (26, 43) which face away from one another in the direction of movement of the valve piston (20) and are loaded with the control space pressure, and the valve piston (20) having a valve piston shoulder (24) with a control pressure face (26) which is formed thereon and delimits a first part control space (31), characterized in that the first part control space (31) is connected to the second part control space (32) which is delimited by a sealing sleeve (40) at one end (22) of the valve piston (20), the end (22) of the valve piston (20) with the sealing sleeve (40) being arranged in a pressure relief space (44), and the second part control space (32) being connected to a third part control space (33) which is delimited by one end of the nozzle needle (3), and the valve piston (20) opening and closing, depending on its position, a connection between the first part control space (31) and the pressure relief space (44), the second control pressure face (43) being formed on the end (22) of the valve piston (20).
  2. Fuel injection valve device according to Claim 1, characterized in that the control pressure face (26) which is formed on the valve piston shoulder (24) is arranged radially within a valve seat diameter (35).
  3. Fuel injection valve device according to Claim 1, characterized in that the sealing sleeve (40) is guided such that it can be moved to and fro on a guide mandrel (46) which is fixed to the housing.
  4. Fuel injection valve device according to Claim 3, characterized in that the guide mandrel (46) comprises a connecting duct (48) which forms the connection between the second part control space (32) and the third part control space (33).
EP09100284.0A 2008-07-16 2009-05-18 Fuel injection valve device Not-in-force EP2146085B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810040454 DE102008040454A1 (en) 2008-07-16 2008-07-16 Fuel injection valve device

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EP2146085A1 EP2146085A1 (en) 2010-01-20
EP2146085B1 true EP2146085B1 (en) 2015-07-29

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Application Number Title Priority Date Filing Date
EP09100284.0A Not-in-force EP2146085B1 (en) 2008-07-16 2009-05-18 Fuel injection valve device

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DE (1) DE102008040454A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404050C1 (en) * 1994-02-09 1994-12-01 Daimler Benz Ag Injector with solenoid-valve control for an internal combustion engine
DE10118053A1 (en) * 2001-04-11 2002-10-24 Bosch Gmbh Robert Valve for controlling liquids e.g. for vehicle fuel injection system, has hydraulic chamber that transfers control piston movement to actuating piston, which is in hydraulic force equilibrium with valve element closed
DE102006050032A1 (en) 2006-10-24 2008-04-30 Robert Bosch Gmbh Injector, particularly common-rail injector, for injecting fuel into combustion chambers of internal-combustion engines, has control valve, which influences pressure in control chamber

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DE102008040454A1 (en) 2010-01-21

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