WO2014166651A1 - Fuel injection valve for internal combustion engines - Google Patents

Fuel injection valve for internal combustion engines Download PDF

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Publication number
WO2014166651A1
WO2014166651A1 PCT/EP2014/052642 EP2014052642W WO2014166651A1 WO 2014166651 A1 WO2014166651 A1 WO 2014166651A1 EP 2014052642 W EP2014052642 W EP 2014052642W WO 2014166651 A1 WO2014166651 A1 WO 2014166651A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
control valve
control
pressure
throttle
Prior art date
Application number
PCT/EP2014/052642
Other languages
German (de)
French (fr)
Inventor
Henning Kreschel
Holger Rapp
Thomas Schwarz
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
Priority to CN201480019989.9A priority Critical patent/CN105102804B/en
Priority to EP14703854.1A priority patent/EP2984328B1/en
Publication of WO2014166651A1 publication Critical patent/WO2014166651A1/en

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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
    • 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
    • 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
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/0077—Valve seat details
    • 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
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid 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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Definitions

  • the invention relates to a fuel injection valve for internal combustion engines, as it is used for fuel injection into the combustion chamber of an internal combustion engine.
  • Fuel injection valves as they are preferably used for fuel injection directly into the combustion chamber of an internal combustion engine, are known from the prior art.
  • compressed fuel is made available in a rail by means of a high-pressure pump and injected by means of injectors into the respective combustion chambers of an internal combustion engine.
  • the injection is controlled by means of a nozzle needle, which performs a longitudinal movement and thereby opens and closes one or more injection openings. Since it is not useful or not possible to move the nozzle needle directly by an electric actuator, in particular in the injection of fuel under high pressure, hydraulic forces exerted by the compressed fuel on the nozzle needle, used for driving. This is in the
  • Fuel injection valve a control chamber formed whose pressure acts directly or indirectly on the nozzle needle and thereby presses against a nozzle seat, so that the nozzle needle closes the injection openings.
  • the fuel pressure in the control chamber is influenced by means of a control valve, wherein the control chamber is alternately connected to a low-pressure chamber or this connection is interrupted by the control valve.
  • a fuel injection valve is known which has such a control valve.
  • the control valve is designed here as a so-called 3/2-way valve and controls the connection of the control room on the one hand to
  • the control valve has a control valve member, which can be moved by means of an electrical actuator, such as a magnet or a piezoelectric actuator, within the control valve chamber and thus cooperates with a first control valve seat and a second control valve seat. Is the control valve member in abutment with the first electrical actuator, such as a magnet or a piezoelectric actuator, within the control valve chamber and thus cooperates with a first control valve seat and a second control valve seat. Is the control valve member in abutment with the first
  • Low pressure space or a leakage connection which has a connection to a low pressure area, closed.
  • the control chamber is connected via an inlet throttle with the high-pressure passage and via an outlet throttle with the control valve chamber.
  • Claim 1 on the other hand, has the advantage that during the
  • Injection process essentially only the amount of fuel that is necessary to reduce the pressure in the control room, must be dissipated in the low pressure space. This increases the efficiency of the
  • the fuel injection valve to a pressure chamber in which a nozzle needle is arranged longitudinally displaceable, wherein the nozzle needle cooperates by its longitudinal movement with a nozzle seat and thereby opens at least one injection port and closes, wherein the nozzle needle directed by the pressure in a control chamber in the direction of the nozzle seat Closing force experiences.
  • a control valve is provided, through which the pressure in the control chamber is adjustable, wherein the control valve comprises a connectable to the control chamber control valve chamber, in which a control valve member
  • control valve chamber is connected to the control chamber via an outlet throttle and to the pressure chamber via an inlet throttle.
  • control valve chamber is connected via a bypass with the control room.
  • the control valve member can open and close the bypass and the inlet throttle.
  • Opening behavior of the nozzle needle can be determined.
  • control valve member is designed so that it opens the bypass and the inlet throttle when it rests against a first control valve seat and closes the connection between the control valve chamber and a low-pressure chamber, and when attached to a second
  • Control valve seat the connection between the control valve chamber and the
  • Low pressure chamber opens and closes the bypass and the inlet throttle. This allows a low Abgresmenge to start the injection process and a rapid pressure increase in the control room to terminate the
  • the second control valve seat is formed on a throttle plate, wherein the outlet throttle, the bypass and the inlet throttle are also formed in the throttle plate.
  • the control valve element Bypass and inlet throttle can be opened and closed directly in a compact and easy-to-manufacture design.
  • a sleeve delimits the control chamber from a high-pressure-carrying pressure chamber and simultaneously performs the
  • Nozzle needle during the opening and closing movement Due to this simple yet reliable design, the nozzle-side openings of the bypass and the inlet throttle can be designed such that the bypass opens into the control chamber and the inlet throttle into the pressure chamber. In addition, for different settings, the volume of the control room can be easily varied.
  • Fig. 1 shows a longitudinal section through an inventive
  • Fuel injection valve with only the essential areas are shown schematically.
  • Fig. 1 shows schematically a fuel injection valve 11 according to the invention in longitudinal section.
  • the fuel injection valve 11 has a valve body 4 and a nozzle body 8, which are braced against each other with the interposition of a throttle plate 6 by means of a tensioning device, not shown. in the
  • Nozzle body 8 is a pressure chamber 14 is formed in which a piston-shaped nozzle needle 10 is arranged longitudinally displaceable.
  • the nozzle needle 10 has at its end facing the combustion chamber on a sealing surface 15, with which it cooperates with a nozzle seat 13 which is formed at the combustion chamber end of the pressure chamber 14. From the nozzle seat 13 go from one or more injection ports 12, which open in installation position of the fuel injection valve 11 directly into a combustion chamber of an internal combustion engine.
  • the nozzle needle 10 is pressed against the nozzle seat 13 by a closing spring 18, which acts on a shoulder 16 and is biased against the throttle plate 6 via a sleeve 22.
  • the sleeve 22 simultaneously serves to guide the longitudinal movement of the nozzle needle 10 and delimits a control chamber 20 from the pressure chamber 14.
  • a control valve 30 comprising a control valve chamber 31, a control valve member 34, two control valve seats 37 and 39 and a spring 38th arranged.
  • the control valve member 34 which can be moved via an actuator 41 arranged in a low pressure chamber 40, is arranged longitudinally displaceable in the control valve chamber 31 and forms at a sealing edge 50 with the
  • Valve body 4 a first control valve seat 37 and at a sealing surface 51 with the throttle plate 6, a second control valve seat 39 from. At her
  • Valve body side end serves the throttle disk 6 as a contact for the spring 38, which surrounds the control valve member 34 and this is acted upon by a force in the direction of the low pressure space 40.
  • the throttle body 6 are both an outlet throttle 1, a bypass 2 and an inlet throttle 3, as well as a high pressure bore 26, the pressure chamber 14 with the High pressure channel 25 connects, formed. It is the
  • Control valve chamber 31 via the outlet throttle 1 to the control chamber 20 and connected via the inlet throttle 3 to the pressure chamber 14.
  • the control valve member 34 can open and close the bypass 2 and the inlet throttle 3 and, on the other hand, the connection of the control valve chamber 31 to the low-pressure chamber 40.
  • the operation of the fuel injection valve is as follows: At the beginning of the injection, the low-pressure space 40 is without pressure or only at a very low pressure level, so that only very small forces are exerted on the control valve member 34 by it. In the control room 20 and in the
  • Control valve chamber 31 is a high fuel pressure, as he also in
  • Nozzle needle 10 presses against the nozzle seat 13. Since the nozzle needle 10 is in contact with the nozzle seat 13, the pressure chamber 14 is sealed against the injection openings 12, so that no fuel from the pressure chamber 14 can get into the combustion chamber of the internal combustion engine.
  • Control chamber 20 via the outlet throttle 1 nachströmende fuel in the
  • Control valve chamber 31 also leads in the control chamber 20 to a pressure drop.
  • the fuel pressure dissipating in the control chamber 20 leads to a reduced hydraulic force on the nozzle seat facing away from the end face of the nozzle needle 10, so that the hydraulic forces acting through the pressure in the pressure chamber 14 on the nozzle needle 10, in particular on parts of the sealing surface 15, that the nozzle needle 10 lifts off from the nozzle seat 13 and is moved counter to the force of the closing spring 18 in the direction of the valve body 4.
  • a gap is opened between the sealing surface 15 and the nozzle seat 13, flows through the fuel from the pressure chamber 14 to the injection openings 12 and is injected through the injection openings 12 in a combustion chamber of the internal combustion engine.
  • control valve member 34 is moved back into abutment against the first control valve seat 37 by means of the actuator 41. Thereby, the connection of the control valve chamber 31 with the low-pressure chamber 40th
  • control valve chamber 31 is connected via the inlet throttle 3 to the high-pressure-carrying pressure chamber 14.
  • the control valve chamber 31 is in turn connected both via the outlet throttle 1 and now also via the bypass 2 with the control chamber 20.
  • a high fuel pressure quickly builds up in the control valve chamber 31 and the control chamber 20 again.
  • Control chamber 20 both through the outlet throttle 1 and the bypass 2 to a very rapid increase in pressure in the control chamber 20.
  • the pressure reduction behavior can be designed on the outlet throttle 1, the pressure build-up behavior on the inlet throttle 3 and the bypass. 2

Landscapes

  • 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)

Abstract

The invention relates to a fuel injection valve for internal combustion engines for injecting highly pressurized fuel, comprising a pressure chamber (14) and a control valve (30) formed in a valve body (4). A nozzle needle (10) is arranged in the pressure chamber (14) in a longitudinally movable manner, said nozzle needle interacting with a nozzle seat (13) by means of the longitudinal movement of the nozzle needle and thereby opening and closing at least one injection opening (12). The nozzle needle (10) is subjected to a closing force directed in the direction of the nozzle seat (13) as a result of the pressure in a control chamber (20). The pressure in the control chamber (20) can be adjusted by means of the control valve (30), said control valve (30) comprising a control valve chamber (31) which can be connected to the control chamber (20) and in which a control valve element (34) is arranged in a longitudinally movable manner. An outlet throttle (1) connects the control chamber (20) to the control valve chamber (31), and an inlet throttle (3) connects the control chamber (14) to the valve chamber (31) in a switchable manner. The control valve chamber (31) can be connected to the control chamber (20) by means of a bypass (2), wherein the control valve element (34) can open and close the bypass (2) and the inlet throttle (3).

Description

Beschreibung  description
Titel title
Kraftstoffeinspritzventil für Brennkraftmaschinen  Fuel injection valve for internal combustion engines
Die Erfindung betrifft ein Kraftstoffeinspritzventil für Brennkraftmaschinen, wie es zur Kraftstoffeinspritzung in den Brennraum einer Brennkraftmaschine verwendet wird. The invention relates to a fuel injection valve for internal combustion engines, as it is used for fuel injection into the combustion chamber of an internal combustion engine.
Stand der Technik State of the art
Kraftstoffeinspritzventile, wie sie vorzugsweise zur Kraftstoffeinspritzung direkt in den Brennraum einer Brennkraftmaschine verwendet werden, sind aus dem Stand der Technik bekannt. Bei Einspritzsystemen, die nach dem sogenannten Common-Rail-Prinzip arbeiten, wird mittels einer Hochdruckpumpe verdichteter Kraftstoff in einem Rail zur Verfügung gestellt und mittels Injektoren in die jeweiligen Brennräume einer Brennkraftmaschine eingespritzt. Die Einspritzung wird mittels einer Düsennadel gesteuert, die eine Längsbewegung ausführt und dadurch eine oder mehrere Einspritzöffnungen öffnet und schließt. Da es insbesondere bei der Einspritzung von Kraftstoff unter hohem Druck nicht sinnvoll oder nicht möglich ist, die Düsennadel direkt durch einen elektrischen Aktor zu bewegen, werden hydraulische Kräfte, die der verdichtete Kraftstoff auf die Düsennadel ausübt, zur Ansteuerung verwendet. Hierzu ist im Fuel injection valves, as they are preferably used for fuel injection directly into the combustion chamber of an internal combustion engine, are known from the prior art. In injection systems which operate according to the so-called common rail principle, compressed fuel is made available in a rail by means of a high-pressure pump and injected by means of injectors into the respective combustion chambers of an internal combustion engine. The injection is controlled by means of a nozzle needle, which performs a longitudinal movement and thereby opens and closes one or more injection openings. Since it is not useful or not possible to move the nozzle needle directly by an electric actuator, in particular in the injection of fuel under high pressure, hydraulic forces exerted by the compressed fuel on the nozzle needle, used for driving. This is in the
Kraftstoffeinspritzventil ein Steuerraum ausgebildet, dessen Druck direkt oder indirekt auf die Düsennadel wirkt und sie dadurch gegen einen Düsensitz presst, so dass die Düsennadel die Einspritzöffnungen verschließt. Durch Änderung des Drucks im Steuerraum und damit der Schließkraft auf die Düsennadel kann die Längsbewegung der Düsennadel gezielt gesteuert werden. Fuel injection valve, a control chamber formed whose pressure acts directly or indirectly on the nozzle needle and thereby presses against a nozzle seat, so that the nozzle needle closes the injection openings. By changing the pressure in the control chamber and thus the closing force on the nozzle needle, the longitudinal movement of the nozzle needle can be controlled specifically.
Der Kraftstoffdruck im Steuerraum wird mittels eines Steuerventils beeinflusst, wobei der Steuerraum abwechselnd mit einem Niederdruckraum verbunden wird oder diese Verbindung wird durch das Steuerventil unterbrochen. Aus der DE 10 2008 001 330 AI ist ein Kraftstoffeinspritzventil bekannt, das ein solches Steuerventil aufweist. Das Steuerventil ist hier als sogenanntes 3/2-Wege- Ventil ausgeführt und steuert die Verbindung des Steuerraums einerseits zur The fuel pressure in the control chamber is influenced by means of a control valve, wherein the control chamber is alternately connected to a low-pressure chamber or this connection is interrupted by the control valve. From DE 10 2008 001 330 AI a fuel injection valve is known which has such a control valve. The control valve is designed here as a so-called 3/2-way valve and controls the connection of the control room on the one hand to
Hochdruckquelle, aus der der verdichtete Kraftstoff dem Einspritzventil zugeführt wird, und andererseits zu einem Niederdruckraum. Das Steuerventil weist ein Steuerventilglied auf, das mittels eines elektrischen Aktors, beispielsweise einem Magnet oder einem Piezoaktor, innerhalb des Steuerventilraums bewegt werden kann und so mit einem ersten Steuerventilsitz und einem zweiten Steuerventilsitz zusammenwirkt. Befindet sich das Steuerventilglied in Anlage am ersten High pressure source from which the compressed fuel is supplied to the injection valve, and on the other hand to a low pressure space. The control valve has a control valve member, which can be moved by means of an electrical actuator, such as a magnet or a piezoelectric actuator, within the control valve chamber and thus cooperates with a first control valve seat and a second control valve seat. Is the control valve member in abutment with the first
Steuerventilsitz, so wird die Verbindung des Steuerventilraums zum  Control valve seat, so the connection of the control valve chamber to
Niederdruckraum bzw. einem Leckageanschluss, der eine Verbindung zu einem Niederdruckbereich aufweist, geschlossen. Der Steuerraum ist über eine Zulaufdrossel mit dem Hochdruckkanal und über eine Ablaufdrossel mit dem Steuerventilraum verbunden. Low pressure space or a leakage connection, which has a connection to a low pressure area, closed. The control chamber is connected via an inlet throttle with the high-pressure passage and via an outlet throttle with the control valve chamber.
Bei dem Steuerventil aus der DE 10 2008 001 330 AI kommt es während des Einspritzvorganges, also bei geöffneter Stellung des Einspritzventils, zu einer Durchströmung des Injektors von der Zulaufdrossel über den Steuerraum und die Ablaufdrossel in den Niederdruckbereich des Injektors und dadurch zu einer Verringerung der Effizienz des Kraftstoffeinspritzventils und zu einem hohenIn the control valve from DE 10 2008 001 330 AI occurs during the injection process, ie in the open position of the injector, to a flow of the injector from the inlet throttle via the control chamber and the outlet throttle in the low pressure region of the injector and thereby to a reduction in efficiency of the fuel injection valve and to a high
Wärmeeintrag in den Niederdruckraum und damit in das Rücklaufsystem. Dies erhöht außerdem den Kraftstoffverbrauch der Brennkraftmaschine. Heat input into the low-pressure chamber and thus into the return system. This also increases the fuel consumption of the internal combustion engine.
Vorteile der Erfindung Advantages of the invention
Das erfindungsgemäße Kraftstoffeinspritzventil mit den Merkmalen des The fuel injection valve according to the invention with the features of
Patentanspruchs 1 weist demgegenüber den Vorteil auf, dass während desClaim 1, on the other hand, has the advantage that during the
Einspritzvorganges im Wesentlichen nur die Menge an Kraftstoff, die zur Druckerniedrigung im Steuerraum notwendig ist, in den Niederdruckraum abgeführt werden muss. Dadurch erhöht sich die Effizienz des Injection process essentially only the amount of fuel that is necessary to reduce the pressure in the control room, must be dissipated in the low pressure space. This increases the efficiency of the
Kraftstoffeinspritzventils bei gleichzeitiger Verringerung des Wärmeeintrags in Aktor und Rücklaufsystem. Der Kraftstoffverbrauch der Brennkraftmaschine wird somit verringert. Dazu weist das Kraftstoffeinspritzventil einen Druckraum auf, in dem eine Düsennadel längsverschiebbar angeordnet ist, wobei die Düsennadel durch ihre Längsbewegung mit einem Düsensitz zusammenwirkt und dadurch wenigstens eine Einspritzöffnung öffnet und schließt, wobei die Düsennadel durch den Druck in einem Steuerraum eine in Richtung des Düsensitzes gerichtete Schließkraft erfährt. Weiter ist ein Steuerventil vorhanden, durch welches der Druck im Steuerraum einstellbar ist, wobei das Steuerventil einen mit dem Steuerraum verbindbaren Steuerventilraum umfasst, in dem ein Steuerventilglied Fuel injector while reducing the heat input in the actuator and return system. The fuel consumption of the internal combustion engine is thus reduced. For this purpose, the fuel injection valve to a pressure chamber in which a nozzle needle is arranged longitudinally displaceable, wherein the nozzle needle cooperates by its longitudinal movement with a nozzle seat and thereby opens at least one injection port and closes, wherein the nozzle needle directed by the pressure in a control chamber in the direction of the nozzle seat Closing force experiences. Next, a control valve is provided, through which the pressure in the control chamber is adjustable, wherein the control valve comprises a connectable to the control chamber control valve chamber, in which a control valve member
längsbewegbar angeordnet ist. Der Steuerventilraum ist über eine Ablaufdrossel mit dem Steuerraum und über eine Zulaufdrossel mit dem Druckraum verbunden. Weiter ist der Steuerventilraum über einen Bypass mit dem Steuerraum verbunden. Das Steuerventilglied kann den Bypass und die Zulaufdrossel öffnen und schließen. is arranged longitudinally movable. The control valve chamber is connected to the control chamber via an outlet throttle and to the pressure chamber via an inlet throttle. Next, the control valve chamber is connected via a bypass with the control room. The control valve member can open and close the bypass and the inlet throttle.
Aufgrund des Verschließens der Zulaufdrossel durch das Steuerventilglied strömt während des Einspritzvorgangs kein Kraftstoff aus dem Druckraum in den Steuerventilraum nach, so dass der Verlust an verdichtetem Kraftstoff minimiert wird. Zusätzlich kann über die Auslegung von Zulaufdrossel und Bypass das Schließverhalten und über die Auslegung der Ablaufdrossel das Due to the closing of the inlet throttle by the control valve member, no fuel flows from the pressure space into the control valve chamber during the injection process, so that the loss of compressed fuel is minimized. In addition, the design of the inlet throttle and bypass the closing behavior and the design of the outlet throttle the
Öffnungsverhalten der Düsennadel bestimmt werden. Opening behavior of the nozzle needle can be determined.
In einer vorteilhaften Ausgestaltung der Erfindung ist das Steuerventilglied so ausgebildet, dass es bei Anlage an einem ersten Steuerventilsitz den Bypass und die Zulaufdrossel öffnet und die Verbindung zwischen dem Steuerventilraum und einem Niederdruckraum schließt, und bei Anlage an einem zweiten In an advantageous embodiment of the invention, the control valve member is designed so that it opens the bypass and the inlet throttle when it rests against a first control valve seat and closes the connection between the control valve chamber and a low-pressure chamber, and when attached to a second
Steuerventilsitz die Verbindung zwischen dem Steuerventilraum und dem Control valve seat the connection between the control valve chamber and the
Niederdruckraum öffnet und den Bypass und die Zulaufdrossel verschließt. Das ermöglicht eine geringe Absteuermenge zum Start des Einspritzvorgangs und eine schnelle Druckerhöhung im Steuerraum zur Beendigung des Low pressure chamber opens and closes the bypass and the inlet throttle. This allows a low Absteuermenge to start the injection process and a rapid pressure increase in the control room to terminate the
Einspritzvorgangs. Injection.
In einer weiteren vorteilhaften Ausgestaltung ist der zweite Steuerventilsitz an einer Drosselscheibe ausgebildet, wobei die Ablaufdrossel, der Bypass und die Zulaufdrossel ebenfalls in der Drosselscheibe ausgebildet sind. Bei diesem kompakten und leicht zu fertigenden Aufbau kann das Steuerventilglied Bypass und Zulaufdrossel direkt öffnen und verschließen. In a further advantageous embodiment, the second control valve seat is formed on a throttle plate, wherein the outlet throttle, the bypass and the inlet throttle are also formed in the throttle plate. In this The control valve element Bypass and inlet throttle can be opened and closed directly in a compact and easy-to-manufacture design.
In einer weiteren vorteilhaften Ausgestaltung grenzt eine Hülse den Steuerraum von einem hochdruckführenden Druckraum ab und führt gleichzeitig die In a further advantageous embodiment, a sleeve delimits the control chamber from a high-pressure-carrying pressure chamber and simultaneously performs the
Düsennadel bei der Öffnungs- und Schließbewegung. Durch diesen einfachen und gleichzeitig zuverlässigen Aufbau können die düsenseitigen Öffnungen von Bypass und Zulaufdrossel so ausgebildet werden, dass der Bypass in den Steuerraum mündet und die Zulaufdrossel in den Druckraum. Zudem kann für verschiedene Einstellungen das Volumen des Steuerraums leicht variiert werden. Nozzle needle during the opening and closing movement. Due to this simple yet reliable design, the nozzle-side openings of the bypass and the inlet throttle can be designed such that the bypass opens into the control chamber and the inlet throttle into the pressure chamber. In addition, for different settings, the volume of the control room can be easily varied.
Zeichnung drawing
Fig. 1 zeigt einen Längsschnitt durch ein erfindungsgemäßes Fig. 1 shows a longitudinal section through an inventive
Kraftstoffeinspritzventil, wobei nur die wesentlichen Bereiche schematisch gezeigt sind. Fuel injection valve, with only the essential areas are shown schematically.
Beschreibung description
Fig. 1 zeigt schematisch ein erfindungsgemäßes Kraftstoffeinspritzventil 11 im Längsschnitt. Das Kraftstoffeinspritzventil 11 weist einen Ventilkörper 4 und einen Düsenkörper 8 auf, die unter Zwischenlage einer Drosselscheibe 6 mit Hilfe einer nicht dargestellten Spannvorrichtung gegeneinander verspannt sind. Im Fig. 1 shows schematically a fuel injection valve 11 according to the invention in longitudinal section. The fuel injection valve 11 has a valve body 4 and a nozzle body 8, which are braced against each other with the interposition of a throttle plate 6 by means of a tensioning device, not shown. in the
Düsenkörper 8 ist ein Druckraum 14 ausgebildet, in dem eine kolbenförmige Düsennadel 10 längsverschiebbar angeordnet ist. Die Düsennadel 10 weist an ihrem dem Brennraum zugewandten Ende eine Dichtfläche 15 auf, mit der sie mit einem Düsensitz 13 zusammenwirkt, der am brennraumseitigen Ende des Druckraums 14 ausgebildet ist. Vom Düsensitz 13 gehen eine oder mehrere Einspritzöffnungen 12 ab, die in Einbaulage des Kraftstoffeinspritzventils 11 direkt in einen Brennraum einer Brennkraftmaschine münden. Die Düsennadel 10 wird durch eine Schließfeder 18, die an einem Absatz 16 angreift und über eine Hülse 22 gegen die Drosselplatte 6 vorgespannt ist, gegen den Düsensitz 13 gepresst. Die Hülse 22 dient gleichzeitig der Führung der Längsbewegung der Düsennadel 10 und grenzt einen Steuerraum 20 vom Druckraum 14 ab. Nozzle body 8 is a pressure chamber 14 is formed in which a piston-shaped nozzle needle 10 is arranged longitudinally displaceable. The nozzle needle 10 has at its end facing the combustion chamber on a sealing surface 15, with which it cooperates with a nozzle seat 13 which is formed at the combustion chamber end of the pressure chamber 14. From the nozzle seat 13 go from one or more injection ports 12, which open in installation position of the fuel injection valve 11 directly into a combustion chamber of an internal combustion engine. The nozzle needle 10 is pressed against the nozzle seat 13 by a closing spring 18, which acts on a shoulder 16 and is biased against the throttle plate 6 via a sleeve 22. The sleeve 22 simultaneously serves to guide the longitudinal movement of the nozzle needle 10 and delimits a control chamber 20 from the pressure chamber 14.
Im Ventilkörper 4 ist ein Steuerventil 30 umfassend einen Steuerventilraum 31, ein Steuerventilglied 34, zwei Steuerventilsitze 37 und 39 und eine Feder 38 angeordnet. Das Steuerventilglied 34, das über einen in einem Niederdruckraum 40 angeordneten Aktor 41 bewegt werden kann, ist im Steuerventilraum 31 längsverschiebbar angeordnet und bildet an einer Dichtkante 50 mit dem In the valve body 4 is a control valve 30 comprising a control valve chamber 31, a control valve member 34, two control valve seats 37 and 39 and a spring 38th arranged. The control valve member 34, which can be moved via an actuator 41 arranged in a low pressure chamber 40, is arranged longitudinally displaceable in the control valve chamber 31 and forms at a sealing edge 50 with the
Ventilkörper 4 einen ersten Steuerventilsitz 37 und an einer Dichtfläche 51 mit der Drosselscheibe 6 einen zweiten Steuerventilsitz 39 aus. An ihrem Valve body 4, a first control valve seat 37 and at a sealing surface 51 with the throttle plate 6, a second control valve seat 39 from. At her
ventilkörperseitigen Ende dient die Drosselscheibe 6 als Anlage für die Feder 38, die das Steuerventilglied 34 umgibt und dieses mit einer Kraft in Richtung des Niederdruckraums 40 beaufschlagt. An ihrem düsenkörperseitigen Ende grenzt die Drosselscheibe 6 sowohl an den Druckraum 14 als auch an den Steuerraum 20. In der Drosselscheibe 6 sind sowohl eine Ablaufdrossel 1, ein Bypass 2 und eine Zulaufdrossel 3, als auch eine Hochdruckbohrung 26, die den Druckraum 14 mit dem Hochdruckkanal 25 verbindet, ausgebildet. Dabei ist der Valve body side end serves the throttle disk 6 as a contact for the spring 38, which surrounds the control valve member 34 and this is acted upon by a force in the direction of the low pressure space 40. In the throttle body 6 are both an outlet throttle 1, a bypass 2 and an inlet throttle 3, as well as a high pressure bore 26, the pressure chamber 14 with the High pressure channel 25 connects, formed. It is the
Steuerventilraum 31 über die Ablaufdrossel 1 mit dem Steuerraum 20 und über die Zulaufdrossel 3 mit dem Druckraum 14 verbunden. Weiter ist der Control valve chamber 31 via the outlet throttle 1 to the control chamber 20 and connected via the inlet throttle 3 to the pressure chamber 14. Next is the
Steuerventilraum 31 über den Bypass 2 mit dem Steuerraum 20 verbunden. Das Steuerventilglied 34 kann einerseits den Bypass 2 und die Zulaufdrossel 3 und andererseits die Verbindung des Steuerventilraums 31 zum Niederdruckraum 40 öffnen und schließen. Control valve chamber 31 via the bypass 2 connected to the control chamber 20. On the one hand, the control valve member 34 can open and close the bypass 2 and the inlet throttle 3 and, on the other hand, the connection of the control valve chamber 31 to the low-pressure chamber 40.
Die Funktionsweise des Kraftstoffeinspritzventils ist wie folgt: Zu Beginn der Einspritzung ist der Niederdruckraum 40 ohne Druck oder nur auf einem sehr geringen Druckniveau, so dass durch ihn nur sehr geringe Kräfte auf das Steuerventilglied 34 ausgeübt werden. Im Steuerraum 20 und im The operation of the fuel injection valve is as follows: At the beginning of the injection, the low-pressure space 40 is without pressure or only at a very low pressure level, so that only very small forces are exerted on the control valve member 34 by it. In the control room 20 and in the
Steuerventilraum 31 liegt ein hoher Kraftstoff druck an, wie er auch im Control valve chamber 31 is a high fuel pressure, as he also in
Hochdruckkanal 25 herrscht. Dadurch befindet sich das Steuerventilglied 34 in Anlage am ersten Steuerventilsitz 37. Durch den Kraftstoffdruck im SteuerraumHigh pressure channel 25 prevails. As a result, the control valve member 34 is in contact with the first control valve seat 37. By the fuel pressure in the control chamber
20 wird auf die düsensitzabgewandte Stirnseite der Düsennadel 10 eine hydraulische Kraft in Richtung auf den Düsensitz 13 ausgeübt, der die 20, a hydraulic force is exerted on the nozzle seat facing away from the end face of the nozzle needle 10 in the direction of the nozzle seat 13, the
Düsennadel 10 gegen den Düsensitz 13 drückt. Da die Düsennadel 10 in Anlage am Düsensitz 13 ist, wird der Druckraum 14 gegen die Einspritzöffnungen 12 abgedichtet, so dass kein Kraftstoff aus dem Druckraum 14 in den Brennraum der Brennkraftmaschine gelangen kann. Nozzle needle 10 presses against the nozzle seat 13. Since the nozzle needle 10 is in contact with the nozzle seat 13, the pressure chamber 14 is sealed against the injection openings 12, so that no fuel from the pressure chamber 14 can get into the combustion chamber of the internal combustion engine.
Soll eine Einspritzung erfolgen, wird mittels des Aktors 41 das Steuerventilglied 34 vom ersten Steuerventilsitz 37 weg in Anlage an den zweiten Steuerventilsitz 39 gedrückt. Dadurch wird zwischen der Dichtkante 50 des Steuerventilglieds 34 und dem ersten Steuerventilsitz 37 eine Verbindung aufgesteuert, die den Steuerventilraum 31 mit dem Niederdruckraum 40 verbindet. Durch die Anlage des Steuerventilglieds 34 am zweiten Steuerventilsitz 39 werden über die Dichtfläche 51 des Steuerventilglieds 34 die Zulaufdrossel 3, und damit die Verbindung des Steuerventilraums 31 zum Druckraum 14, und der Bypass 2 geschlossen. In dieser Stellung des Steuerventils 30 fällt der Druck wegen des abfließenden Kraftstoffs im Steuerventilraum 31 rasch ab. Der aus dem If an injection is to take place, by means of the actuator 41, the control valve member 34 from the first control valve seat 37 away in abutment against the second control valve seat 39 pressed. As a result, a connection is opened between the sealing edge 50 of the control valve member 34 and the first control valve seat 37, which connects the control valve chamber 31 with the low-pressure chamber 40. By the installation of the control valve member 34 on the second control valve seat 39, the inlet throttle 3, and thus the connection of the control valve chamber 31 to the pressure chamber 14, and the bypass 2 are closed via the sealing surface 51 of the control valve member 34. In this position of the control valve 30, the pressure drops rapidly because of the outflowing fuel in the control valve chamber 31. The from the
Steuerraum 20 über die Ablaufdrossel 1 nachströmende Kraftstoff in den Control chamber 20 via the outlet throttle 1 nachströmende fuel in the
Steuerventilraum 31 führt auch im Steuerraum 20 zu einem Druckabfall. Der sich im Steuerraum 20 abbauende Kraftstoffdruck führt zu einer verminderten hydraulischen Kraft auf die düsensitzabgewandte Stirnfläche der Düsennadel 10, so dass die hydraulischen Kräfte, die durch den Druck im Druckraum 14 auf die Düsennadel 10, insbesondere auf Teile der Dichtfläche 15 wirken, dazu führen, dass die Düsennadel 10 vom Düsensitz 13 abhebt und entgegen der Kraft der Schließfeder 18 in Richtung des Ventilkörpers 4 bewegt wird. Hierdurch wird zwischen der Dichtfläche 15 und dem Düsensitz 13 ein Spalt aufgesteuert, durch den Kraftstoff aus dem Druckraum 14 zu den Einspritzöffnungen 12 fließt und durch die Einspritzöffnungen 12 in einen Brennraum der Brennkraftmaschine eingespritzt wird. Control valve chamber 31 also leads in the control chamber 20 to a pressure drop. The fuel pressure dissipating in the control chamber 20 leads to a reduced hydraulic force on the nozzle seat facing away from the end face of the nozzle needle 10, so that the hydraulic forces acting through the pressure in the pressure chamber 14 on the nozzle needle 10, in particular on parts of the sealing surface 15, that the nozzle needle 10 lifts off from the nozzle seat 13 and is moved counter to the force of the closing spring 18 in the direction of the valve body 4. In this way, a gap is opened between the sealing surface 15 and the nozzle seat 13, flows through the fuel from the pressure chamber 14 to the injection openings 12 and is injected through the injection openings 12 in a combustion chamber of the internal combustion engine.
Zur Beendigung der Einspritzung wird mittels des Aktors 41 das Steuerventilglied 34 zurück in Anlage an den ersten Steuerventilsitz 37 bewegt. Dadurch wird die Verbindung des Steuerventilraums 31 mit dem Niederdruckraum 40 To end the injection, the control valve member 34 is moved back into abutment against the first control valve seat 37 by means of the actuator 41. Thereby, the connection of the control valve chamber 31 with the low-pressure chamber 40th
unterbrochen. Gleichzeitig hebt die Dichtfläche 51 vom zweiten Steuerventilsitz 39 ab, so dass der Steuerventilraum 31 über die Zulaufdrossel 3 mit dem hochdruckführenden Druckraum 14 verbunden wird. Der Steuerventilraum 31 ist wiederum sowohl über die Ablaufdrossel 1 als jetzt auch über den Bypass 2 mit dem Steuerraum 20 verbunden. Dadurch baut sich in Steuerventilraum 31 und Steuerraum 20 rasch wieder ein hoher Kraftstoff druck auf. interrupted. At the same time, the sealing surface 51 lifts off from the second control valve seat 39, so that the control valve chamber 31 is connected via the inlet throttle 3 to the high-pressure-carrying pressure chamber 14. The control valve chamber 31 is in turn connected both via the outlet throttle 1 and now also via the bypass 2 with the control chamber 20. As a result, a high fuel pressure quickly builds up in the control valve chamber 31 and the control chamber 20 again.
Bei Beendigung der Einspritzung kommt es wegen der Befüllung des Upon completion of the injection, it comes because of the filling of the
Steuerraums 20 sowohl durch die Ablaufdrossel 1 als auch den Bypass 2 zu einem sehr raschen Druckanstieg im Steuerraum 20. Das Druckabbauverhalten kann über die Ablaufdrossel 1 gestaltet werden, das Druckaufbauverhalten über die Zulaufdrossel 3 und den Bypass 2. Control chamber 20 both through the outlet throttle 1 and the bypass 2 to a very rapid increase in pressure in the control chamber 20. The pressure reduction behavior can be designed on the outlet throttle 1, the pressure build-up behavior on the inlet throttle 3 and the bypass. 2

Claims

Patentansprüche claims
1. Kraftstoffeinspritzventil für Brennkraftmaschinen zur Einspritzung von Kraftstoff unter hohem Druck mit einem Druckraum (14), in dem eine Düsennadel (10) längsverschiebbar angeordnet ist, wobei die Düsennadel (10) durch ihre Längsbewegung mit einem Düsensitz (13) zusammenwirkt und dadurch wenigstens eine Einspritzöffnung (12) öffnet und schließt, und wobei die 1. Fuel injection valve for internal combustion engines for the injection of fuel at high pressure with a pressure chamber (14) in which a nozzle needle (10) is arranged longitudinally displaceable, wherein the nozzle needle (10) by their longitudinal movement with a nozzle seat (13) cooperates and thereby at least one Injection opening (12) opens and closes, and wherein the
Düsennadel (10) durch den Druck in einem Steuerraum (20) eine in Richtung des Düsensitzes (13) gerichtete Schließkraft erfährt, und mit einem in einem Nozzle needle (10) by the pressure in a control chamber (20) in the direction of the nozzle seat (13) directed closing force undergoes, and with a in a
Ventilkörper (4) ausgebildeten Steuerventil (30), durch welches der Druck im Steuerraum (20) einstellbar ist, wobei das Steuerventil (30) einen mit dem Valve body (4) formed control valve (30) through which the pressure in the control chamber (20) is adjustable, wherein the control valve (30) one with the
Steuerraum (20) verbindbaren Steuerventilraum (31) umfasst, in dem ein Control chamber (20) connectable control valve chamber (31), in which a
Steuerventilglied (34) längsbewegbar angeordnet ist, und mit einer Ablaufdrossel (1), die den Steuerraum (20) mit dem Steuerventilraum (31) verbindet, und einer Zulaufdrossel (3), die den Druckraum (14) schaltbar mit dem Ventilraum (31) verbindet, dadurch gekennzeichnet, dass der Steuerventilraum (31) durch einen Bypass (2) mit dem Steuerraum (20) verbindbar ist, wobei das Steuerventilglied (34) den Bypass (2) und die Control valve member (34) is arranged longitudinally movable, and with an outlet throttle (1) which connects the control chamber (20) with the control valve chamber (31), and an inlet throttle (3), the pressure chamber (14) switchable with the valve chamber (31) connects, characterized in that the control valve chamber (31) by a bypass (2) with the control chamber (20) is connectable, wherein the control valve member (34) the bypass (2) and the
Zulaufdrossel (3) öffnen und schließen kann. Inlet throttle (3) can open and close.
2. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass das Steuerventilglied (34) bei Anlage an einem ersten Steuerventilsitz (37) den Bypass (2) und die Zulaufdrossel (3) öffnet und die Verbindung zwischen dem Steuerventilraum (31) und einem Niederdruckraum (40) schließt, und bei Anlage an einem zweiten Steuerventilsitz (39) die Verbindung zwischen dem 2. Fuel injection valve according to claim 1, characterized in that the control valve member (34) when applied to a first control valve seat (37) opens the bypass (2) and the inlet throttle (3) and the connection between the control valve chamber (31) and a low pressure chamber ( 40), and when connected to a second control valve seat (39) the connection between the
Steuerventilraum (31) und dem Niederdruckraum (40) öffnet und den Bypass (2) und die Zulaufdrossel (3) verschließt. Control valve chamber (31) and the low-pressure chamber (40) opens and closes the bypass (2) and the inlet throttle (3).
3. Kraftstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, dass der zweite Steuerventilsitz (39) an einer Drosselscheibe (6) ausgebildet ist und dass die Ablaufdrossel (1), der Bypass (2) und die Zulaufdrossel (3) in der Drosselscheibe (6) ausgebildet sind. 3. Fuel injection valve according to claim 2, characterized in that the second control valve seat (39) on a throttle plate (6) is formed and that the outlet throttle (1), the bypass (2) and the inlet throttle (3) in the throttle plate (6). are formed.
4. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass eine Hülse (22) den Steuerraum (20) begrenzt. 4. Fuel injection valve according to claim 1, characterized in that a sleeve (22) delimits the control chamber (20).
PCT/EP2014/052642 2013-04-11 2014-02-11 Fuel injection valve for internal combustion engines WO2014166651A1 (en)

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EP14703854.1A EP2984328B1 (en) 2013-04-11 2014-02-11 Fuel injection valve for internal combustion engines

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WO2005050003A1 (en) * 2003-11-14 2005-06-02 Robert Bosch Gmbh Injector used to inject fuel into internal combustion chambers in internal combustion engines, particularly, a piezo-actuator controlled common-rail-injector
JP2007205324A (en) * 2006-02-06 2007-08-16 Denso Corp Fuel injection valve
EP2019198A2 (en) * 2007-07-24 2009-01-28 Robert Bosch GmbH Injector
DE102009000283A1 (en) * 2008-02-04 2009-08-06 Robert Bosch Gmbh Fuel injector, particularly common-rail injector for injecting fuel into combustion chamber of internal-combustion engine, has sealing edge that is formed at front wall of injection valve element
DE102008001330A1 (en) 2008-04-23 2009-10-29 Robert Bosch Gmbh Fuel injection valve for internal combustion engines

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DE10205970A1 (en) * 2002-02-14 2003-09-04 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE102006057025A1 (en) * 2006-12-04 2008-06-05 Robert Bosch Gmbh Fuel injector for injecting fuel into combustion chamber of internal combustion engine, has pressure-compensating magnetic valve with valve element that opens or locks valve seat, where valve element or piece of valve has spherical surface

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WO2005050003A1 (en) * 2003-11-14 2005-06-02 Robert Bosch Gmbh Injector used to inject fuel into internal combustion chambers in internal combustion engines, particularly, a piezo-actuator controlled common-rail-injector
JP2007205324A (en) * 2006-02-06 2007-08-16 Denso Corp Fuel injection valve
EP2019198A2 (en) * 2007-07-24 2009-01-28 Robert Bosch GmbH Injector
DE102009000283A1 (en) * 2008-02-04 2009-08-06 Robert Bosch Gmbh Fuel injector, particularly common-rail injector for injecting fuel into combustion chamber of internal-combustion engine, has sealing edge that is formed at front wall of injection valve element
DE102008001330A1 (en) 2008-04-23 2009-10-29 Robert Bosch Gmbh Fuel injection valve for internal combustion engines

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CN105102804A (en) 2015-11-25
CN105102804B (en) 2018-04-27

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