WO2008068084A2 - Fuel injection valve for internal combustion engines - Google Patents

Fuel injection valve for internal combustion engines Download PDF

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Publication number
WO2008068084A2
WO2008068084A2 PCT/EP2007/060732 EP2007060732W WO2008068084A2 WO 2008068084 A2 WO2008068084 A2 WO 2008068084A2 EP 2007060732 W EP2007060732 W EP 2007060732W WO 2008068084 A2 WO2008068084 A2 WO 2008068084A2
Authority
WO
WIPO (PCT)
Prior art keywords
valve
control
control sleeve
valve seat
fuel injection
Prior art date
Application number
PCT/EP2007/060732
Other languages
German (de)
French (fr)
Other versions
WO2008068084A3 (en
Inventor
Nestor Rodriguez-Amaya
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 AT07821100T priority Critical patent/ATE460583T1/en
Priority to CN200780045276XA priority patent/CN101548093B/en
Priority to EP07821100A priority patent/EP2100027B1/en
Priority to DE502007003108T priority patent/DE502007003108D1/en
Publication of WO2008068084A2 publication Critical patent/WO2008068084A2/en
Publication of WO2008068084A3 publication Critical patent/WO2008068084A3/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
    • 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
    • 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
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a fuel injection valve for internal combustion engines, as it is used for the injection of fuel directly into the combustion chambers of internal combustion engines and which is preferably used in so-called common rail systems.
  • the invention is based on a fuel injection valve, as is known from the laid-open specification EP 1 612 403 A1.
  • the injection valve described therein has a valve needle for opening and closing at least one injection opening, wherein the movement of the valve needle is controlled by the fact that the pressure in a control chamber is lowered or raised by a control valve.
  • the control valve controls a cross section between a non-pressurized leakage oil space, which is also present in the fuel injection valve, and the control chamber, wherein the control chamber is constantly connected via a high-pressure line with a high-pressure fuel source.
  • the control valve comprises a
  • Control sleeve which is arranged longitudinally displaceable and which is movable via an electromagnet in the longitudinal direction.
  • the control sleeve cooperates with a valve seat, so that when it rests against the valve seat, an annular space which is connected to the control chamber is closed against the leakage oil space. If the control sleeve lifts off the valve seat, a connecting cross-section is opened which connects the annular space and thus also the control chamber with the leakage oil space.
  • the closing of the control valve should be carried out as quickly as possible, so that the valve needle closes very quickly to prevent dripping of the fuel injection valve, which can reach unspent fuel into the combustion chamber, which would increase the hydrocarbon emissions.
  • the closing movement is effected by the force of a strong closing spring, which leads to a relatively violent impact of the control sleeve on the valve seat and thus to corresponding noise, which could interfere with and beyond the wear in the region of the valve seat elevated.
  • the fuel injection valve according to the invention has the advantage that the control sleeve is damped in the last portion of its closing movement seated on the valve seat, so that the forces are reduced in the region of the valve seat. This also reduces the wear, and the noise of the control valve is reduced.
  • the control sleeve has an outer cylindrical portion which faces an inner cylindrical portion on the throttle body upon contact of the control sleeve on the valve seat, so that between the two cylindrical sections, a throttle gap is formed, wherein the area between the control sleeve and the valve seat at open control valve is filled with fuel. During the closing movement of the control sleeve, this fuel is forced into the leakage oil space, which happens virtually without resistance in the known fuel injection valve.
  • both the valve seat and the sealing surface of the control sleeve, with which the control sleeve ultimately rests on the valve seat are substantially conically shaped, wherein the conical surfaces have a different opening angle, so that the control sleeve substantially at a sealing edge on the valve seat seated and ensures a better seal.
  • the inclination of the conical surfaces of the sealing surface and the valve seat is designed so that the sealing edge is formed on the inner edge of the control sleeve.
  • Figure 1 in longitudinal section the essential section of a fuel injection - valve, wherein the well-known from the prior art
  • Figure 2 is an enlargement of Figure 1 in the region of the valve seat of the control valve.
  • Figure 1 shows a longitudinal section through a fuel injection valve according to the invention, wherein only the essential components are drawn in the region of the control valve.
  • the other components known from the state of the art, in particular the injection nozzle, are for example in DE
  • the fuel injection valve has a housing 1 which comprises a control valve body 2 and a holding body 3.
  • a valve piston 10th illustrated which acts on the valve needle, not shown in the drawing, which ultimately opens and closes the injection openings, is injected through the fuel into the combustion chamber of the internal combustion engine.
  • the valve piston 10 is guided in a valve piece 12 which is arranged in the holding body 3.
  • a control chamber 15 is limited, which is filled via an inlet throttle 20, which is formed in the valve member 12, and formed in a holding body 3 inlet channel 19 with fuel at high pressure.
  • an outlet throttle 18 is provided in the valve piece 12, via which the fuel can be removed from the control chamber 15 into a leakage oil space 40 formed in the control valve body 2.
  • a valve body 25 is arranged in the control valve body 2, in which a bore 28 is formed, into which the outlet throttle 18 opens.
  • the bore 28 is at its end facing away from the holding body 3 in a transverse bore 29, wherein the transverse bore 29 opens into an annular space 30 which is formed in a spinous process 27 of the valve body 25.
  • a control sleeve 32 is arranged longitudinally displaceable, which is connected to a magnet armature 38 and which is pressed by a closing spring 35 against a valve body 25 formed on the valve seat 42.
  • the support of the control sleeve 32 on the valve seat 42 takes place here with a sealing surface 43 which is formed on the valve seat side end of the control sleeve 32.
  • the movement of the control sleeve 32 is effected by means of an electromagnet 37 which surrounds the control sleeve 32 and is arranged within the control valve body 2.
  • the armature 38 connected to the control sleeve 32 is energized by the electromagnet 37 when energized, so that the electromagnet moves away from the holding body 3 and thereby entrains the control sleeve 32, which thus lifts off from the valve seat 42.
  • a cross section between the annular space 30 and the leakage oil space 40 is opened, so that the fuel in the annular space 30 is expanded into the leakage oil space 40.
  • About the transverse bore 29, the bore 28 and the outlet throttle 18 is thus the pressure in the control room
  • an inner cylindrical portion 48 is formed on the valve body 25, an inner cylindrical portion 48 is formed.
  • the inner cylindrical portion 48 is in the closed control valve 5, that is, when the control sleeve 32 is in contact with the valve seat 42, an outer cylindrical portion 49 opposite, which is formed on the inside of the control sleeve 32.
  • a throttle gap 50 is formed between the two cylindrical sections 48 and 49 which dampens the closing movement of the control sleeve 32. This happens because the fuel, which is present when the control valve 5 is open between the valve seat 42 and the sealing surface 43, is displaced by the closing movement in the control sleeve 32.
  • valve seat 42 and sealing surface 43 The exact configuration of valve seat 42 and sealing surface 43 is shown in FIG.
  • the valve seat 42 has a conical shape, which drops outwardly in the illustration of Figure 2 and merges into the inner cylindrical portion 48 at the outer edge.
  • the sealing surface 43 which is formed on the control sleeve 32, also has a conical shape, wherein the cone is formed here flatter than the valve seat 42.
  • the conical sealing surface 43 merges at its outer end in the outer cylindrical portion 49, the the inner cylindrical portion 48 is opposite. Due to the conical configuration of the surfaces 42, 43, a sealing edge 45 is formed on the sealing surface 43, with which the control sleeve 32 rests on the valve seat 42. By the sealing edge 45 is a increased sealing force formed at this point, which unfolds by the increased surface pressure a good sealing effect.
  • control sleeve 32 In addition to the movement of the control sleeve 32 by an electromagnet, it may also be provided to move the control sleeve 32 by another electric actuator, for example a piezoelectric actuator. Since the control sleeve 32 is pressure balanced, d. h., That by the fuel pressure in the annulus 30 no longitudinal force acting on the control sleeve 32 is exercised, 32 only little force necessary for the movement of the control sleeve, so that a piezoelectric actuator would be suitable, possibly with a corresponding Wegberger GmbH.

Abstract

Disclosed is a fuel injection valve for internal combustion engines, comprising a housing (1) and a control valve (5) which allows a control chamber (15) to be connected to a leakage oil chamber (40). The control valve (5) encompasses a valve body (25) and a control sleeve (32) that can be moved by means of a solenoid (37). The control sleeve (32) delimits, in a radially external direction, an annular space (30) that is connected to the control chamber (32). The control sleeve (32) cooperates with a valve seat (42) formed on the valve body (25) in order to open and close a cross-section that connects the annular space (30) to the leakage oil chamber (40). The control sleeve (32) has an external cylindrical section (49) which lies opposite an internal cylindrical section (48) on the valve body (25) when the control sleeve (32) rests on the valve seat (42) such that a throttling gap (50) is formed between the external cylindrical section (49) of the control sleeve (32) and the internal cylindrical section (48) of the valve body (25).

Description

Beschreibung description
Titeltitle
Kraftstoffeinspritzventil für BrennkraftmaschinenFuel injection valve for internal combustion engines
Die Erfindung betrifft ein Kraftstoffeinspritzventil für Brennkraftmaschinen, wie es zur Einspritzung von Kraftstoff direkt in die Brennräume von Brennkraftmaschinen verwendet wird und das vorzugsweise in sogenannten Common-Rail- Systemen verwendet wird.The invention relates to a fuel injection valve for internal combustion engines, as it is used for the injection of fuel directly into the combustion chambers of internal combustion engines and which is preferably used in so-called common rail systems.
Stand der TechnikState of the art
Die Erfindung geht von einem Kraftstoffeinspritzventil aus, wie es aus der Offen- legungsschrift EP 1 612 403 Al bekannt ist. Das dort beschriebene Einspritzventil weist eine Ventilnadel zum Öffnen und Schließen wenigstens einer Einspritz- Öffnung auf, wobei die Bewegung der Ventilnadel dadurch gesteuert wird, dass der Druck in einem Steuerraum durch ein Steuerventil gesenkt oder angehoben wird. Das Steuerventil steuert einen Querschnitt zwischen einem drucklosen Leckölraum, der ebenfalls im Kraftstoffeinspritzventil vorhanden ist, und dem Steuerraum, wobei der Steuerraum über eine Hochdruckleitung ständig mit einer Kraftstoffhochdruckquelle verbunden ist. Das Steuerventil umfasst dabei eineThe invention is based on a fuel injection valve, as is known from the laid-open specification EP 1 612 403 A1. The injection valve described therein has a valve needle for opening and closing at least one injection opening, wherein the movement of the valve needle is controlled by the fact that the pressure in a control chamber is lowered or raised by a control valve. The control valve controls a cross section between a non-pressurized leakage oil space, which is also present in the fuel injection valve, and the control chamber, wherein the control chamber is constantly connected via a high-pressure line with a high-pressure fuel source. The control valve comprises a
Steuerhülse, die längsverschiebbar angeordnet ist und die über einen Elektromagneten in Längsrichtung bewegbar ist. Die Steuerhülse wirkt mit einem Ventilsitz zusammen, sodass bei Anlage am Ventilsitz ein Ringraum, der mit dem Steuerraum verbunden ist, gegen den Leckölraum verschlossen wird. Hebt die Steuerhülse vom Ventilsitz ab, so wird ein Verbindungsquerschnitt aufgesteuert, der den Ringraum und damit auch den Steuerraum mit den Leckölraum verbindet.Control sleeve, which is arranged longitudinally displaceable and which is movable via an electromagnet in the longitudinal direction. The control sleeve cooperates with a valve seat, so that when it rests against the valve seat, an annular space which is connected to the control chamber is closed against the leakage oil space. If the control sleeve lifts off the valve seat, a connecting cross-section is opened which connects the annular space and thus also the control chamber with the leakage oil space.
Beim Betrieb des Kraftstoffeinspritzventils, insbesondere in schnelllaufenden Brennkraftmaschinen, sind sehr rasch aufeinander folgende Schaltvorgänge des Steuerventils nötig. Bei modernen Einspritzsystemen ist es darüber hinaus üblich, dass sich die Einspritzung auf mehrere Teileinspritzungen verteilt, um einen sanfteren Verbrennungsablauf und niedrigere Schadstoffemissionen zu ermöglichen.During operation of the fuel injection valve, in particular in high-speed internal combustion engines, very rapid successive switching operations of the Control valve needed. In addition, in modern injection systems, it is common for the injection to be distributed over several partial injections in order to allow a smoother combustion process and lower pollutant emissions.
Das Schließen des Steuerventils soll dabei möglichst rasch erfolgen, damit auch die Ventilnadel sehr rasch schließt, um ein Nachtropfen des Kraftstoffeinspritzventils zu verhindern, wodurch unzerstäubter Kraftstoff in den Brennraum gelangen kann, der die Kohlenwasserstoffemissionen erhöhen würde. Bei dem be- kannten Steuerventil wird die Schließbewegung jedoch durch die Kraft einer starken Schließfeder bewirkt, die zu einem relativ heftigen Aufschlagen der Steuerhülse auf den Ventilsitz führt und damit zu entsprechendem Geräusch, was sich störend auswirken könnte und darüber hinaus den Verschleiß im Bereich des Ventilsitzes erhöht.The closing of the control valve should be carried out as quickly as possible, so that the valve needle closes very quickly to prevent dripping of the fuel injection valve, which can reach unspent fuel into the combustion chamber, which would increase the hydrocarbon emissions. In the known control valve, however, the closing movement is effected by the force of a strong closing spring, which leads to a relatively violent impact of the control sleeve on the valve seat and thus to corresponding noise, which could interfere with and beyond the wear in the region of the valve seat elevated.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Kraftstoffeinspritzventil weist demgegenüber den Vorteil auf, dass die Steuerhülse im letzten Abschnitt ihrer Schließbewegung gedämpft auf den Ventilsitz aufsitzt, so dass die Kräfte im Bereich des Ventilsitzes vermindert werden. Dies senkt damit auch der Verschleiß, und das Geräusch des Steuerventils wird gemindert. Zu diesem Zweck weist die Steuerhülse einen äußeren zylindrischen Abschnitt auf, der bei Anlage der Steuerhülse auf den Ventilsitz einen inneren zylindrischen Abschnitt am Drosselkörper gegenüberliegt, so dass zwischen den beiden zylindrischen Abschnitten ein Drosselspalt gebildet wird, wobei der Bereich zwischen der Steuerhülse und dem Ventilsitz bei geöffnetem Steuerventil mit Kraftstoff gefüllt ist. Bei der Schließbewegung der Steuerhülse wird dieser Kraftstoff in den Leckölraum gedrückt, was bei dem bekannten Kraftstoffeinspritzventil praktisch ohne Widerstand geschieht. Durch die Ausbildung der beiden zylindrischen Abschnitte wird dieser Kraftstoff jedoch über den gebildeten Drosselspalt relativ langsam in den Leckölraum gedrückt, so dass sich ein Kraftstoff po Ister bildet, welches das Aufsetzen der Steuerhülse auf den Ventilsitz dämpft und so die oben beschriebenen Vorteile entstehen lässt. Durch die abhängigen Ansprüche sind vorteilhafte Weiterbildungen des Gegenstandes der Erfindung möglich. So sind sowohl der Ventilsitz, als auch die Dichtfläche der Steuerhülse, mit der die Steuerhülse letztendlich auf den Ventilsitz aufsetzt, im Wesentlichen konisch geformt, wobei die Konusflächen einen unter- schiedlichen Öffnungswinkel aufweisen, so dass die Steuerhülse im Wesentlichen an einer Dichtkante auf den Ventilsitz aufsitzt und eine bessere Abdichtung gewährleistet. Durch die unterschiedlichen Öffnungswinkel lässt sich außerdem das Volumen zwischen der Steuerhülse und dem Ventilsitz einstellen und damit auch die Dämpfungswirkung des Kraftstoffpolsters. In vorteilhafter Weise ist hier- bei die Neigung der konischen Flächen von Dichtfläche und Ventilsitz so ausgebildet, dass die Dichtkante am inneren Rand der Steuerhülse ausgebildet ist. Dadurch kann das Volumen in weiten Grenzen eingestellt werden, um die gewünschte Dämpfungswirkung zu erreichen.In contrast, the fuel injection valve according to the invention has the advantage that the control sleeve is damped in the last portion of its closing movement seated on the valve seat, so that the forces are reduced in the region of the valve seat. This also reduces the wear, and the noise of the control valve is reduced. For this purpose, the control sleeve has an outer cylindrical portion which faces an inner cylindrical portion on the throttle body upon contact of the control sleeve on the valve seat, so that between the two cylindrical sections, a throttle gap is formed, wherein the area between the control sleeve and the valve seat at open control valve is filled with fuel. During the closing movement of the control sleeve, this fuel is forced into the leakage oil space, which happens virtually without resistance in the known fuel injection valve. However, due to the formation of the two cylindrical sections, this fuel is pressed relatively slowly into the leakage oil space via the throttle gap formed, so that a fuel is formed, which dampens the seating of the control sleeve on the valve seat and thus gives rise to the advantages described above. By the dependent claims advantageous developments of the subject invention are possible. Thus, both the valve seat and the sealing surface of the control sleeve, with which the control sleeve ultimately rests on the valve seat, are substantially conically shaped, wherein the conical surfaces have a different opening angle, so that the control sleeve substantially at a sealing edge on the valve seat seated and ensures a better seal. Due to the different opening angle can also adjust the volume between the control sleeve and the valve seat and thus also the damping effect of the fuel cushion. Advantageously, the inclination of the conical surfaces of the sealing surface and the valve seat is designed so that the sealing edge is formed on the inner edge of the control sleeve. As a result, the volume can be adjusted within wide limits in order to achieve the desired damping effect.
Zeichnungdrawing
In der Zeichnung ist ein erfindungsgemäßes Kraftstoffeinspritzventil dargestellt. Es zeigtIn the drawing, an inventive fuel injection valve is shown. It shows
Figur 1 im Längsschnitt den wesentlichen Ausschnitt eines Kraftstoff einspritz - ventils, wobei die aus dem Stand der Technik hinreichend bekannteFigure 1 in longitudinal section the essential section of a fuel injection - valve, wherein the well-known from the prior art
Einspritzdüse nicht dargestellt ist undInjector is not shown and
Figur 2 eine Vergrößerung von Figur 1 im Bereich des Ventilsitzes des Steuerventils.Figure 2 is an enlargement of Figure 1 in the region of the valve seat of the control valve.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Figur 1 zeigt einen Längsschnitt durch ein erfindungsgemäßes Kraftstoffeinspritzventil, wobei nur die wesentlichen Komponenten im Bereich des Steuerventils gezeichnet sind. Die übrigen aus dem Stand der Technik hinreichend bekann- ten Komponenten, insbesondere die Einspritzdüse, sind beispielsweise in der DEFigure 1 shows a longitudinal section through a fuel injection valve according to the invention, wherein only the essential components are drawn in the region of the control valve. The other components known from the state of the art, in particular the injection nozzle, are for example in DE
198 27 267 Al ausführlich dargestellt und hier der Übersichtlichkeit halber weggelassen.198 27 267 Al shown in detail and omitted here for clarity.
Das Kraftstoffeinspritzventil weist ein Gehäuse 1 auf, das einen Steuerventilkör- per 2 und einen Haltekörper 3 umfasst. Im Haltekörper 3 ist ein Ventilkolben 10 dargestellt, der auf die in der Zeichnung nicht dargestellte Ventilnadel wirkt, welche letztendlich die Einspritzöffnungen öffnet und schließt, durch die Kraftstoff in den Brennraum der Brennkraftmaschine eingespritzt wird. Der Ventilkolben 10 ist in einem Ventilstück 12 geführt, das im Haltekörper 3 angeordnet ist. Durch die im Ventilstück 12 ausgebildete Bohrung und die Stirnseite des Ventilkolbens 10 wird ein Steuerraum 15 begrenzt, der über eine Zulaufdrossel 20, die im Ventilstück 12 ausgebildet ist, und einen im Haltekörper 3 ausgebildeten Zulaufkanal 19 mit Kraftstoff unter hohem Druck befüllbar ist. Im Ventilstück 12 ist darüber hinaus eine Ablaufdrossel 18 vorgesehen, über die der Kraftstoff aus dem Steu- erraum 15 in einen im Steuerventilkörper 2 ausgebildeten Leckölraum 40 abgeführt werden kann. Hierzu ist im Steuerventilkörper 2 ein Ventilkörper 25 angeordnet, in dem eine Bohrung 28 ausgebildet ist, in die die Ablaufdrossel 18 mündet. Die Bohrung 28 geht an ihrem dem Haltekörper 3 abgewandten Ende in eine Querbohrung 29 über, wobei die Querbohrung 29 in einen Ringraum 30 mündet, der in einem Dornfortsatz 27 des Ventilkörpers 25 ausgebildet ist. Auf dem Dornfortsatz 27 ist eine Steuerhülse 32 längsverschiebbar angeordnet, die mit einem Magnetanker 38 verbunden ist und die durch eine Schließfeder 35 gegen einen am Ventilkörper 25 ausgebildeten Ventilssitz 42 gedrückt wird. Die Auflage der Steuerhülse 32 auf den Ventilsitz 42 geschieht hierbei mit einer Dichtfläche 43, die am ventilsitzseitigen Ende der Steuerhülse 32 ausgebildet ist.The fuel injection valve has a housing 1 which comprises a control valve body 2 and a holding body 3. In the holding body 3 is a valve piston 10th illustrated, which acts on the valve needle, not shown in the drawing, which ultimately opens and closes the injection openings, is injected through the fuel into the combustion chamber of the internal combustion engine. The valve piston 10 is guided in a valve piece 12 which is arranged in the holding body 3. By formed in the valve piece 12 bore and the end face of the valve piston 10, a control chamber 15 is limited, which is filled via an inlet throttle 20, which is formed in the valve member 12, and formed in a holding body 3 inlet channel 19 with fuel at high pressure. In addition, an outlet throttle 18 is provided in the valve piece 12, via which the fuel can be removed from the control chamber 15 into a leakage oil space 40 formed in the control valve body 2. For this purpose, a valve body 25 is arranged in the control valve body 2, in which a bore 28 is formed, into which the outlet throttle 18 opens. The bore 28 is at its end facing away from the holding body 3 in a transverse bore 29, wherein the transverse bore 29 opens into an annular space 30 which is formed in a spinous process 27 of the valve body 25. On the spinous process 27, a control sleeve 32 is arranged longitudinally displaceable, which is connected to a magnet armature 38 and which is pressed by a closing spring 35 against a valve body 25 formed on the valve seat 42. The support of the control sleeve 32 on the valve seat 42 takes place here with a sealing surface 43 which is formed on the valve seat side end of the control sleeve 32.
Die Bewegung der Steuerhülse 32 geschieht mittels eines Elektromagneten 37, der die Steuerhülse 32 umgibt und innerhalb des Steuerventilkörpers 2 angeordnet ist. Der mit der Steuerhülse 32 verbundene Magnetanker 38 wird bei Bestro- mung durch den Elektromagneten 37 angezogen, so dass sich der Elektromagnet vom Haltekörper 3 wegbewegt und dadurch die Steuerhülse 32 mitnimmt, die so vom Ventilsitz 42 abhebt. Dadurch wird ein Querschnitt zwischen dem Ringraum 30 und dem Leckölraum 40 aufgesteuert, so dass der Kraftstoff im Ringraum 30 in den Leckölraum 40 entspannt wird. Über die Querbohrung 29, die Bohrung 28 und die Ablaufdrossel 18 wird damit auch der Druck im SteuerraumThe movement of the control sleeve 32 is effected by means of an electromagnet 37 which surrounds the control sleeve 32 and is arranged within the control valve body 2. The armature 38 connected to the control sleeve 32 is energized by the electromagnet 37 when energized, so that the electromagnet moves away from the holding body 3 and thereby entrains the control sleeve 32, which thus lifts off from the valve seat 42. As a result, a cross section between the annular space 30 and the leakage oil space 40 is opened, so that the fuel in the annular space 30 is expanded into the leakage oil space 40. About the transverse bore 29, the bore 28 and the outlet throttle 18 is thus the pressure in the control room
15 entlastet, wobei die Ablaufdrossel 18 und die Zulaufdrossel 20 so dimensioniert sind, dass bei geöffnetem Steuerventil 5 mehr Kraftstoff aus dem Steuerraum 15 abfließt als über die Zulaufdrossel 20 zufließt. Durch die Druckabsenkung im Steuerraum 15 vermindert sich die hydraulische Kraft auf die Stirnseite des Ventilkolbens 10, so dass die in der Zeichnung nicht dargestellte Ventilnadel, angetrieben durch den von einem Hochdruckspeicher zur Verfügung gestellten Kraftstoffdruck, den Ventilkolben 10 in Richtung des Steuerventils 5 verschiebt und dadurch die Einspritzöffnungen freigibt. Zur Beendigung der Einspritzung wird die Bestromung des Elektromagneten 37 zurückgefahren, so dass die Schließfeder 35 die Steuerhülse 32 erneut in ihre Schließstellung, d. h. in Anlage an den Ventilsitz 42, bringt.15 relieved, wherein the outlet throttle 18 and the inlet throttle 20 are dimensioned so that when open control valve 5 more fuel flows from the control chamber 15 than flows through the inlet throttle 20. Due to the pressure reduction in the control chamber 15, the hydraulic force decreases to the end face of the valve piston 10, so that the valve needle, not shown in the drawing, driven by the provided by a high-pressure accumulator fuel pressure, the valve piston 10 moves in the direction of the control valve 5 and thereby releases the injection ports. To end the injection, the energization of the electromagnet 37 is moved back so that the closing spring 35, the control sleeve 32 again in its closed position, ie in abutment against the valve seat 42 brings.
Am Ventilkörper 25 ist ein innerer zylindrischer Abschnitt 48 ausgebildet. Dem inneren zylindrischen Abschnitt 48 liegt bei geschlossenem Steuerventil 5, also dann, wenn die Steuerhülse 32 in Anlage am Ventilsitz 42 ist, ein äußerer zylindrischer Abschnitt 49 gegenüber, der an der Innenseite der Steuerhülse 32 ausgebildet ist. Zwischen den beiden zylindrischen Abschnitten 48 und 49 wird da- durch ein Drosselspalt 50 gebildet, der die Schließbewegung der Steuerhülse 32 dämpft. Dies geschieht dadurch, dass der Kraftstoff, der bei geöffnetem Steuerventil 5 zwischen dem Ventilsitz 42 und der Dichtfläche 43 vorhanden ist, durch die Schließbewegung in der Steuerhülse 32 verdrängt wird. Sobald der innere zylindrische Abschnitt 48 und der äußere zylindrische Abschnitt 49 einander ge- genüber liegen und den Drosselspalt 50 bilden, kann dieser Kraftstoff nur noch verzögert durch den Drosselspalt 50 in den Leckölraum gedrückt werden. Das sich dadurch bildende Kraftstoffpolster dämpft die Bewegung der Steuerhülse 32, die dadurch sanfter auf den Ventilsitz 42 aufsetzt, als dies bei dem bekannten Steuerventil der Fall ist.On the valve body 25, an inner cylindrical portion 48 is formed. The inner cylindrical portion 48 is in the closed control valve 5, that is, when the control sleeve 32 is in contact with the valve seat 42, an outer cylindrical portion 49 opposite, which is formed on the inside of the control sleeve 32. As a result, a throttle gap 50 is formed between the two cylindrical sections 48 and 49 which dampens the closing movement of the control sleeve 32. This happens because the fuel, which is present when the control valve 5 is open between the valve seat 42 and the sealing surface 43, is displaced by the closing movement in the control sleeve 32. As soon as the inner cylindrical section 48 and the outer cylindrical section 49 lie opposite each other and form the throttle gap 50, this fuel can only be pressed through the throttle gap 50 into the leakage oil space with a delay. The thereby forming fuel cushion dampens the movement of the control sleeve 32, which thereby gently touches on the valve seat 42, as is the case with the known control valve.
Die genaue Ausgestaltung von Ventilsitz 42 und Dichtfläche 43 ist in Figur 2 dargestellt. Der Ventilsitz 42 weist eine konische Form auf, die in der Darstellung der Figur 2 nach außen abfällt und am äußeren Rand in den inneren zylindrischen Abschnitt 48 übergeht. Die Dichtfläche 43, die an der Steuerhülse 32 aus- gebildet ist, weist ebenfalls eine Konusform auf, wobei der Konus hier flacher ausgebildet ist als am Ventilsitz 42. Die konische Dichtfläche 43 geht an ihrem äußeren Ende in den äußeren zylindrischen Abschnitt 49 über, der dem inneren zylindrischen Abschnitt 48 gegenüberliegt. Durch die konische Ausgestaltung der Flächen 42, 43 wird an der Dichtfläche 43 eine Dichtkante 45 gebildet, mit der die Steuerhülse 32 auf dem Ventilsitz 42 aufliegt. Durch die Dichtkante 45 wird eine erhöhte Dichtkraft an dieser Stelle gebildet, die durch die erhöhte Flächenpressung eine gute Dichtwirkung entfaltet.The exact configuration of valve seat 42 and sealing surface 43 is shown in FIG. The valve seat 42 has a conical shape, which drops outwardly in the illustration of Figure 2 and merges into the inner cylindrical portion 48 at the outer edge. The sealing surface 43, which is formed on the control sleeve 32, also has a conical shape, wherein the cone is formed here flatter than the valve seat 42. The conical sealing surface 43 merges at its outer end in the outer cylindrical portion 49, the the inner cylindrical portion 48 is opposite. Due to the conical configuration of the surfaces 42, 43, a sealing edge 45 is formed on the sealing surface 43, with which the control sleeve 32 rests on the valve seat 42. By the sealing edge 45 is a increased sealing force formed at this point, which unfolds by the increased surface pressure a good sealing effect.
Neben der Bewegung der Steuerhülse 32 durch einen Elektromagneten kann es auch vorgesehen sein, die Steuerhülse 32 durch einen anderen elektrischen Aktor zu bewegen, beispielsweise einen Piezoaktor. Da die Steuerhülse 32 druckausgeglichen ist, d. h., dass durch den Kraftstoffdruck im Ringraum 30 keine in Längsrichtung wirkende resultierende Kraft auf die Steuerhülse 32 ausgeübt wird, sind für die Bewegung der Steuerhülse 32 nur geringe Kraft notwendig, so dass auch ein Piezoaktor geeignet wäre, ggf. mit einer entsprechenden Wegübersetzung. In addition to the movement of the control sleeve 32 by an electromagnet, it may also be provided to move the control sleeve 32 by another electric actuator, for example a piezoelectric actuator. Since the control sleeve 32 is pressure balanced, d. h., That by the fuel pressure in the annulus 30 no longitudinal force acting on the control sleeve 32 is exercised, 32 only little force necessary for the movement of the control sleeve, so that a piezoelectric actuator would be suitable, possibly with a corresponding Wegübersetzung.

Claims

Ansprüche claims
1. Kraftstoffeinspritzventil für Brennkraftmaschinen mit einem Gehäuse (1) und mit einem Steuerventil (5), über das ein Steuerraum (15) mit einem Lecköl- raum (40) verbindbar ist, und das Steuerventil (5) eine durch einen Elektromagneten (37) bewegbare Steuerhülse (32) und einen Ventilkörper (25) um- fasst, wobei die Steuerhülse (32) einen mit dem Steuerraum (15) verbundenen Ringraum (30) radial nach außen begrenzt und die Steuerhülse (32) mit einem an dem Ventilkörper (25) ausgebildeten Ventilsitz (42) zum Öffnen und Schließen eines den Ringraum (30) und den Leckölraum (40) verbindenden Querschnitts zusammenwirkt, dadurch gekennzeichnet, dass die Steuerhülse (32) einen äußeren zylindrischen Abschnitt (49) aufweist, der bei Anlage der Steuerhülse (32) auf dem Ventilsitz (42) einem inneren zylindri- sehen Abschnitt (48) am Ventilkörper (25) gegenüberliegt, so dass zwischen dem äußeren zylindrischen Abschnitt (49) der Steuerhülse (32) und dem inneren zylindrischen Abschnitt (48) des Ventilkörpers (25) ein Drosselspalt (50) gebildet wird.A fuel injection valve for internal combustion engines with a housing (1) and with a control valve (5) via which a control chamber (15) with a Lecköl- space (40) is connectable, and the control valve (5) by a solenoid (37) movable control sleeve (32) and a valve body (25) comprises, wherein the control sleeve (32) connected to the control chamber (15) annular space (30) bounded radially outward and the control sleeve (32) with a on the valve body (25 ) formed valve seat (42) for opening and closing a the annular space (30) and the leakage oil space (40) connecting cross-section, characterized in that the control sleeve (32) has an outer cylindrical portion (49) which upon installation of the control sleeve ( 32) on the valve seat (42) faces an inner cylindrical portion (48) on the valve body (25), so that between the outer cylindrical portion (49) of the control sleeve (32) and the inner cylindrical A Bschnitt (48) of the valve body (25), a throttle gap (50) is formed.
2. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der zwischen der Steuerhülse (32) und dem Ventilsitz (42) befindliche Kraftstoff bei der Schließbewegung durch den Drosselspalt (50) mit einem solchen Strömungswiderstand in den Leckölraum (40) gedrückt wird, dass die Bewegung der Steuerhülse (32) auf den Ventilsitz (42) zu gedämpft wird.2. Fuel injection valve according to claim 1, characterized in that the fuel between the control sleeve (32) and the valve seat (42) is pressed during the closing movement through the throttle gap (50) with such a flow resistance in the leakage oil chamber (40) that the Movement of the control sleeve (32) on the valve seat (42) is attenuated.
3. Kraftstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Ventilsitz (42) eine konische Fläche umfasst, auf der die Steuerhülse (32) im geschlossenen Zustand des Steuerventils (5) aufsetzt, wobei sich die zylindrische Fläche am Ventilkörper (25) an den radial äußeren Rand der konischen Fläche anschließt. 3. Fuel injection valve according to claim 1 or 2, characterized in that the valve seat (42) comprises a conical surface on which the control sleeve (32) in the closed state of the control valve (5) touches, wherein the cylindrical surface on the valve body (25). adjoins the radially outer edge of the conical surface.
4. Kraftstoffeinspritzventil nach Anspruch 3, dadurch gekennzeichnet, dass an der Steuerhülse (32) eine Dichtfläche (43) ausgebildet ist, mit der die Steuerhülse (32) auf dem Ventilsitz (42) im geschlossenen Zustand des Steuerventils (5) aufsitzt.4. Fuel injection valve according to claim 3, characterized in that on the control sleeve (32) has a sealing surface (43) is formed, with which the control sleeve (32) on the valve seat (42) in the closed state of the control valve (5).
5. Kraftstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet, dass die5. Fuel injection valve according to claim 4, characterized in that the
Dichtfläche (43) konisch ausgebildet ist und einen Öffnungswinkel aufweist, der größer als der des konischen Ventilsitzes (42) ist, so dass an der Dichtfläche (43) eine Dichtkante (45) ausgebildet ist, mit der die Steuerhülse (32) auf dem Ventilsitz (42) im geschlossenen Zustand des Steuerventils (5) auf- setzt. Sealing surface (43) is conical and has an opening angle which is greater than that of the conical valve seat (42), so that on the sealing surface (43) has a sealing edge (45) is formed, with which the control sleeve (32) on the valve seat (42) when the control valve (5) is closed.
PCT/EP2007/060732 2006-12-08 2007-10-10 Fuel injection valve for internal combustion engines WO2008068084A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT07821100T ATE460583T1 (en) 2006-12-08 2007-10-10 FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES
CN200780045276XA CN101548093B (en) 2006-12-08 2007-10-10 Fuel injection valve for internal combustion engines
EP07821100A EP2100027B1 (en) 2006-12-08 2007-10-10 Fuel injection valve for internal combustion engines
DE502007003108T DE502007003108D1 (en) 2006-12-08 2007-10-10 FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES

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DE102006057935A DE102006057935A1 (en) 2006-12-08 2006-12-08 Fuel injection valve for internal combustion engines
DE102006057935.6 2006-12-08

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2025922A3 (en) * 2007-08-10 2009-04-01 Robert Bosch Gmbh Fuel injector valve for combustion engines
CN102076950A (en) * 2008-06-27 2011-05-25 罗伯特·博世有限公司 Fuel injector with two-piece armature
CN102374084A (en) * 2011-09-20 2012-03-14 福建省莆田市中涵机动力有限公司 Static non-leakage high pressure common-rail injector

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602008005725D1 (en) * 2008-06-27 2011-05-05 Fiat Ricerche Fuel injection device with balanced measuring servo valve for an internal combustion engine
EP2138708B1 (en) * 2008-06-27 2010-11-03 C.R.F. Società Consortile per Azioni Fuel injector equipped with a metering servovalve for an internal combustion engine
US9464613B2 (en) 2008-06-27 2016-10-11 C.R.F. Societa Consortile Per Azioni Fuel injector equipped with a metering servovalve for an internal combustion engine
DE102009046830B4 (en) 2009-11-18 2023-02-02 Robert Bosch Gmbh Common rail system with a quantity control valve
DE102010043092A1 (en) * 2010-10-29 2012-05-03 Robert Bosch Gmbh Pressure control valve
DE102011076666A1 (en) 2011-05-30 2012-12-06 Robert Bosch Gmbh Fuel injector for use in common rail injection system of internal combustion engine, has sleeve having outer leakage side portion partially opened by control valve and configured to have a flow force due to fluid jet on sleeve
CN102852684B (en) * 2012-10-12 2014-09-17 福建省莆田市中涵机动力有限公司 Pressure balancing type external sealing plane control valve of common-rail oil sprayer
DE102012220031A1 (en) 2012-11-02 2014-05-08 Robert Bosch Gmbh Fuel injector for internal combustion engine, has one throttle gap that is formed in area of spill compound, where another throttle gap is provided in spill compound besides former throttle gap
DE102014212549A1 (en) * 2014-06-30 2015-12-31 Robert Bosch Gmbh Gas injector for injecting gaseous fuels
DE102015202978A1 (en) * 2015-02-19 2016-08-25 Robert Bosch Gmbh Pressure control valve
DE102015204515A1 (en) * 2015-03-12 2016-09-15 Robert Bosch Gmbh Control valve for a fuel injector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000055490A1 (en) * 1999-03-18 2000-09-21 Delphi Technologies Inc. Fuel injector
DE10131125A1 (en) * 2001-06-28 2002-09-12 Bosch Gmbh Robert Magnetic valve has damped, one-piece armature with armature plate and bolt, element damping upward motion of armature in valve seat associated with underside of armature plate
US20030106533A1 (en) * 2001-12-11 2003-06-12 Cummins Ins. Fuel injector with feedback control
EP1612403A1 (en) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Servo valve for controlling an internal combustion engine fuel injector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10335340A1 (en) * 2003-08-01 2005-02-24 Robert Bosch Gmbh Control valve for a pressure injector containing fuel injector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000055490A1 (en) * 1999-03-18 2000-09-21 Delphi Technologies Inc. Fuel injector
DE10131125A1 (en) * 2001-06-28 2002-09-12 Bosch Gmbh Robert Magnetic valve has damped, one-piece armature with armature plate and bolt, element damping upward motion of armature in valve seat associated with underside of armature plate
US20030106533A1 (en) * 2001-12-11 2003-06-12 Cummins Ins. Fuel injector with feedback control
EP1612403A1 (en) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Servo valve for controlling an internal combustion engine fuel injector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2025922A3 (en) * 2007-08-10 2009-04-01 Robert Bosch Gmbh Fuel injector valve for combustion engines
CN102076950A (en) * 2008-06-27 2011-05-25 罗伯特·博世有限公司 Fuel injector with two-piece armature
CN102374084A (en) * 2011-09-20 2012-03-14 福建省莆田市中涵机动力有限公司 Static non-leakage high pressure common-rail injector

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DE102006057935A1 (en) 2008-06-12
CN101548093A (en) 2009-09-30
EP2100027A2 (en) 2009-09-16
EP2100027B1 (en) 2010-03-10
WO2008068084A3 (en) 2008-07-24
DE502007003108D1 (en) 2010-04-22
ATE460583T1 (en) 2010-03-15
CN101548093B (en) 2012-08-08

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