EP0351631B1 - Control device for a fuel injection nozzle - Google Patents

Control device for a fuel injection nozzle Download PDF

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Publication number
EP0351631B1
EP0351631B1 EP89112156A EP89112156A EP0351631B1 EP 0351631 B1 EP0351631 B1 EP 0351631B1 EP 89112156 A EP89112156 A EP 89112156A EP 89112156 A EP89112156 A EP 89112156A EP 0351631 B1 EP0351631 B1 EP 0351631B1
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EP
European Patent Office
Prior art keywords
valve
valve body
valve seat
pressure chamber
control device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89112156A
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German (de)
French (fr)
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EP0351631A1 (en
Inventor
Michael Dipl.-Ing. Zipprath
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INA Waelzlager Schaeffler OHG
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INA Waelzlager Schaeffler OHG
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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric 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
    • F02M63/0031—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
    • F02M63/0078—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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/502—Springs biasing the valve member to the open position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to a control device for a fuel injection nozzle of an internal combustion engine, in particular a diesel engine, with a tubular valve body which is displaceably guided in a valve housing on a guide diameter and controlled by a drive element and which can be placed at one end on a valve seat of the valve housing and an interior has, which is supported on the valve body, a pressure spring counteracting the force of the drive element, and with a fuel pressure chamber which is arranged in the valve housing between a fuel inlet and the valve seat, the valve seat being opposite the end of the valve body close to the inlet and at When the valve is closed, an injection pressure builds up in the pressure chamber for the injection nozzle and when the valve is open there is pressure equalization between the pressure chamber and a fuel outlet, the pressure chamber being open to the outlet through the interior through the valve seat is.
  • a control device for a fuel injector is described in document DE-A-3 704 743.
  • the drive element for example electronically controlled, emits a force-displacement pulse with which the valve seat is closed. This is in a fuel return line. By closing the valve seat, a desired, high injection pressure builds up on the injection nozzle of the relevant cylinder of the internal combustion engine.
  • valve seat is provided on the valve housing opposite the end of the valve body near the drain.
  • the volume of the pressure chamber is correspondingly large.
  • a large-volume pressure chamber is unfavorable, however, since a correspondingly large fuel volume must be pressurized when the valve is closed.
  • the fuel when the valve is opened, the fuel must flow outside the valve body. A comparatively high flow resistance is to be expected, which delays the pressure equalization.
  • the object of the invention is to improve a control device of the type mentioned in such a way that, on the one hand, the pressure builds up when the valve is closed and, on the other hand, the pressure equalization takes place quickly when the valve is open.
  • valve body When the valve is opened, the pressure chamber communicates with the comparatively large-volume interior of the valve body.
  • the flow resistance during pressure equalization is low, so that pressure equalization takes place quickly.
  • the valve body has a comparatively small moving mass. It has a tubular shape and does not need any outside Area where the fuel flows out when the pressure is equalized. Overall, the control characteristic of the control device is improved by the measures described.
  • valve seat diameter on the valve body is smaller than its guide diameter.
  • a tubular valve body (2) is slidably mounted in a valve housing (1).
  • the guide diameter of the valve body (2) in the valve housing (1) is designated D1.
  • a valve seat (4) is formed between one end edge (3) of the valve body (2) and the valve housing (1).
  • the valve seat diameter is designated D2. This is slightly smaller than the guide diameter D1.
  • the valve body (2) forms an interior (5).
  • the valve seat (4) is shown in its open position in the figure.
  • the compression spring (7) presses the valve body (2) with its end edge (8) facing away from the end edge (3) against a stop ring (9) via the snap ring (6).
  • cup part (10) On the front edge (8) there is a cup part (10) which is connected to a membrane (11).
  • the cup part (10) is provided with openings (12) which lead to an outlet (13) to lead.
  • the interior (5) is thus open to the drain (13).
  • a play compensation element (15) is arranged in an upper part (14) of the valve housing (1), which on the one hand abuts the cup part (10) and on the other hand is acted upon by a drive element (16).
  • An inlet (17) is provided on the valve body (2).
  • An annular pressure chamber (18) is formed between this and the valve seat (4).
  • the valve housing (1) is inserted into a base body (19). It is held in this by means of a screw sleeve (20).
  • the sequence (13) continues in the base body (19).
  • a further outlet (21) is provided on the valve body (2) in the area of the interior (5). This is assigned to a corresponding opening (22) in the base body (19).
  • the base body (19) is designed so that only one of the processes (13, 21) is effective.
  • the drain (13 or 21) is connected to the low pressure side of an injection pump, not shown.
  • An injection nozzle, not shown, and the inlet (17) are located on the high-pressure side thereof.
  • Fuel is supplied by the injection pump through the inlet (17), the pressure chamber (18), the valve seat (4), the interior (5) and the outlet (13 or 21) connected in each case. No pressure builds up in the pressure chamber (18), so that the injection nozzle is closed.
  • the compression spring (7) keeps the valve seat (4) open.
  • the drive element (16) If the drive element (16) is actuated, for example electronically controlled, then it presses the cup part (10) onto the valve body (2) via the play compensation element (15) so that the valve seat (4) counteracts the force of the compression spring (7). closes.
  • a high pressure for example 1000 bar, builds up in the pressure chamber (18) and opens the injection nozzle.
  • the locking force to be transmitted to the valve seat (4) is comparatively low, since the valve seat diameter (D2) and the guide diameter (D1) are essentially the same size.
  • valve body (2) moves under the action of the compression spring (7).
  • the opening effect is supported by the fact that the valve seat diameter (D2) is slightly smaller than the guide diameter (D1).
  • the valve seat (4) is opened, the pressure prevailing in the pressure chamber (18) quickly decreases via the interior (5).

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

Description

Die Erfindung betrifft eine Steuereinrichtung für eine Kraftstoff-Einspritzdüse eines Verbrennungsmotors, insbesondere Dieselmotors, mit einem in einem Ventilgehäuse auf einem Führungsdurchmesser verschieblich geführten, von einem Antriebselement gesteuerten, rohrförmigen Ventilkörper, der mit seinem einen Ende an einen Ventilsitz des Ventilgehäuses anlegbar ist und einen Innenraum aufweist, wobei sich am Ventilkörper eine der Kraft des Antriebselements entgegenwirkende Druckfeder abstützt, und mit einem Kraftstoff-Druckraum, der in dem Ventilgehäuse zwischen einem Kraftstoff-Zulauf und dem Ventilsitz angeordnet ist, wobei der Ventilsitz dem dem Zulauf nahen Ende des Ventilkörpers gegenüberliegt und bei geschlossenem Ventil sich im Druckraum ein Einspritzdruck für die Einspritzdüse aufbaut und bei geöffnetem Ventil ein Druckausgleich zwischen dem Druckraum und einem Kraftstoff-Ablauf erfolgt, wobei der Druckraum über den Ventilsitz durch den Innenraum zum Ablauf offen ist.The invention relates to a control device for a fuel injection nozzle of an internal combustion engine, in particular a diesel engine, with a tubular valve body which is displaceably guided in a valve housing on a guide diameter and controlled by a drive element and which can be placed at one end on a valve seat of the valve housing and an interior has, which is supported on the valve body, a pressure spring counteracting the force of the drive element, and with a fuel pressure chamber which is arranged in the valve housing between a fuel inlet and the valve seat, the valve seat being opposite the end of the valve body close to the inlet and at When the valve is closed, an injection pressure builds up in the pressure chamber for the injection nozzle and when the valve is open there is pressure equalization between the pressure chamber and a fuel outlet, the pressure chamber being open to the outlet through the interior through the valve seat is.

Eine Steuereinrichtung für eine Kraftstoff-Einspritzdüse ist in dem Dokument DE-A-3 704 743 beschrieben. Das Antriebselement gibt, beispielsweise elektronisch gesteuert, einen Kraft-Weg-Impuls ab, mit dem der Ventilsitz geschlossen wird. Dieser liegt in einer Kraftstoff-Rückführungsleitung. Durch das Schließen des Ventilsitzes baut sich an der Einspritzdüse des betreffenden Zylinders des Verbrennungsmotors ein gewünschter, hoher Einspritzdruck auf.A control device for a fuel injector is described in document DE-A-3 704 743. The drive element, for example electronically controlled, emits a force-displacement pulse with which the valve seat is closed. This is in a fuel return line. By closing the valve seat, a desired, high injection pressure builds up on the injection nozzle of the relevant cylinder of the internal combustion engine.

Bei dieser Steuereinrichtung ist der Ventilsitz an dem Ventilgehäuse gegenüber dem dem Ablauf nahen Ende des Ventilkörpers vorgesehen.In this control device, the valve seat is provided on the valve housing opposite the end of the valve body near the drain.

Dementsprechend groß ist das Volumen des Druckraumes. Ein großvolumiger Druckraum ist jedoch ungünstig, da in diesem beim Schließen des Ventils ein entsprechend großes Kraftstoffvolumen unter Druck gesetzt werden muß. Außerdem muß beim Öffnen des Ventils der Kraftstoff außen an dem Ventilkörper abfließen. Dabei ist mit einem vergleichsweise hohen Strömungswiderstand zu rechnen, der den Druckausgleich verzögert.The volume of the pressure chamber is correspondingly large. A large-volume pressure chamber is unfavorable, however, since a correspondingly large fuel volume must be pressurized when the valve is closed. In addition, when the valve is opened, the fuel must flow outside the valve body. A comparatively high flow resistance is to be expected, which delays the pressure equalization.

Auch bei den aus den Dokumenten US-A-4 392 612 und US-A-4 550 875 bekannten Steuereinrichtungen erfolgt der mit einem Strömungswiderstand verbundene Kraftstoffabfluß jeweils außen am Ventilkörper, und zwar in einer Ringnut auf einem Teil der Ventilkörperlänge. Der Innenraum des Ventilkörpers, der im Vergleich mit dem Ringspalt der Ringnut einen wesentlich größeren Querschnitt aufweist, wird hier als Strömungsweg praktisch nicht ausgenutzt.Also in the control devices known from documents US-A-4 392 612 and US-A-4 550 875, the fuel outflow associated with a flow resistance takes place on the outside of the valve body, in an annular groove over part of the valve body length. The interior of the valve body, which has a substantially larger cross section in comparison with the annular gap of the annular groove, is practically not used here as a flow path.

Aufgabe der Erfindung ist es, eine Steuereinrichtung der eingangs genannten Art so zu verbessern, daß einerseits der Druckaufbau bei geschlossenem Ventil und andererseits der Druckausgleich bei geöffnetem Ventil schnell erfolgt.The object of the invention is to improve a control device of the type mentioned in such a way that, on the one hand, the pressure builds up when the valve is closed and, on the other hand, the pressure equalization takes place quickly when the valve is open.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der von dem Ventilsitz abgewandten Stirnkante des rohrförmigen Ventilkörpers ein Anschlagring zugeordnet ist und auf dieser Stirnkante ein Becherteil zum Antrieb des Ventilkörpers aufsteht, welches mit Öffnungen versehen ist, durch die der Innenraum des Ventilkörpers zum Ablauf hin offen ist, und daß sich die Druckfeder über einen Sprengring auf der Innenseite des Ventilkörpers abstützt.This object is achieved in that the end edge of the tubular valve body facing away from the valve seat is assigned a stop ring and on this end edge a cup part for driving the valve body stands, which is provided with openings through which the interior of the valve body is open to the drain , and that the compression spring is supported by a snap ring on the inside of the valve body.

Beim Öffnen des Ventils steht der Druckraum mit dem vergleichsweise großvolumigen Innenraum des Ventilkörpers in Verbindung. Der Strömungswiderstand beim Druckausgleich ist gering, so daß der Druckausgleich schnell vor sich geht. Ein weiterer Vorteil besteht darin, daß der Ventilkörper eine vergleichsweise kleine bewegte Masse aufweist. Er hat rohrförmige Gestalt und benötigt außen keinen Bereich, an dem der Kraftstoff beim Druckausgleich abfließt. Insgesamt ist durch die beschriebenen Maßnahmen die Steuercharakteristik der Steuereinrichtung verbessert.When the valve is opened, the pressure chamber communicates with the comparatively large-volume interior of the valve body. The flow resistance during pressure equalization is low, so that pressure equalization takes place quickly. Another advantage is that the valve body has a comparatively small moving mass. It has a tubular shape and does not need any outside Area where the fuel flows out when the pressure is equalized. Overall, the control characteristic of the control device is improved by the measures described.

In bevorzugter Ausgestaltung der Erfindung ist der Ventilsitzdurchmesser am Ventilkörper kleiner als dessen Führungsdurchmesser. Dadurch wirkt der Druck des Druckraums so, daß er das Öffnen des Ventilsitzes unterstützt.In a preferred embodiment of the invention, the valve seat diameter on the valve body is smaller than its guide diameter. As a result, the pressure of the pressure chamber acts so that it supports the opening of the valve seat.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispiels. Die Figur zeigt eine Steuereinrichtung im Schnitt.Further advantageous refinements of the invention result from the following description of an exemplary embodiment. The figure shows a control device in section.

In einem Ventilgehäuse(1) ist ein rohrförmiger Ventilkörper(2) verschieblich gelagert. Der Führungsdurchmesser des Ventilkörpers(2) im Ventilgehäuse(1) ist mit D1 bezeichnet.A tubular valve body (2) is slidably mounted in a valve housing (1). The guide diameter of the valve body (2) in the valve housing (1) is designated D1.

Zwischen der einen Stirnkante(3) des Ventilkörpers(2) und dem Ventilgehäuse(1) ist ein Ventilsitz(4) ausgebildet. Der Ventilsitzdurchmesser ist mit D2 bezeichnet. Dieser ist geringfügig kleiner als der Führungsdurchmesser D1.A valve seat (4) is formed between one end edge (3) of the valve body (2) and the valve housing (1). The valve seat diameter is designated D2. This is slightly smaller than the guide diameter D1.

Der Ventilkörper(2) bildet einen Innenraum(5). Innen am Ventilkörper(2) sitzt ein Sprengring(6), an dem sich eine Druckfeder(7) abstützt. In der Figur ist der Ventilsitz(4) in seiner Offenstellung gezeigt. Dabei drückt die Druckfeder(7) über den Sprengring(6) den Ventilkörper(2) mit seiner der Stirnkante(3) abgewandten Stirnkante(8) gegen einen Anschlagring(9).The valve body (2) forms an interior (5). On the inside of the valve body (2) there is a snap ring (6) on which a compression spring (7) is supported. The valve seat (4) is shown in its open position in the figure. The compression spring (7) presses the valve body (2) with its end edge (8) facing away from the end edge (3) against a stop ring (9) via the snap ring (6).

Auf der Stirnkante(8) steht ein Becherteil(10) auf, das mit einer Membran(11) verbunden ist. Das Becherteil(10) ist mit Öffnungen(12) versehen, die zu einem Ablauf(13) führen. Der Innenraum(5) ist dadurch zum Ablauf(13) hin offen.On the front edge (8) there is a cup part (10) which is connected to a membrane (11). The cup part (10) is provided with openings (12) which lead to an outlet (13) to lead. The interior (5) is thus open to the drain (13).

In einem Oberteil(14) des Ventilgehäuses(1) ist ein Spiel-Ausgleichselement(15) angeordnet, das einerseits an dem Becherteil(10) ansteht und das andererseits von einem Antriebselement(16) beaufschlagt ist.A play compensation element (15) is arranged in an upper part (14) of the valve housing (1), which on the one hand abuts the cup part (10) and on the other hand is acted upon by a drive element (16).

Am Ventilkörper(2) ist ein Zulauf(17) vorgesehen. Zwischen diesem und dem Ventilsitz(4) ist ein ringförmiger Druckraum(18) ausgebildet.An inlet (17) is provided on the valve body (2). An annular pressure chamber (18) is formed between this and the valve seat (4).

Das Ventilgehäuse(1) ist in einen Grundkörper(19) eingesetzt. Es ist in diesem mittels einer Schraubhülse(20) gehalten.The valve housing (1) is inserted into a base body (19). It is held in this by means of a screw sleeve (20).

Der Ablauf(13) setzt sich im Grundkörper(19) fort. Am Ventilkörper(2) ist im Bereich des Innenraums(5) ein weiterer Ablauf(21) vorgesehen. Dieser ist einer entsprechenden Durchbrechung(22) des Grundkörpers(19) zugeordnet. Im Regelfall ist der Grundkörper(19) so gestaltet, daß nur einer der Abläufe(13,21) wirksam ist.The sequence (13) continues in the base body (19). A further outlet (21) is provided on the valve body (2) in the area of the interior (5). This is assigned to a corresponding opening (22) in the base body (19). As a rule, the base body (19) is designed so that only one of the processes (13, 21) is effective.

Der Ablauf(13 bzw. 21) ist mit der Niederdruckseite einer nicht näher dargestellten Einspritzpumpe verbunden. An deren Hochdruckseite liegen eine nicht näher dargestellte Einspritzdüse und der Zulauf(17).The drain (13 or 21) is connected to the low pressure side of an injection pump, not shown. An injection nozzle, not shown, and the inlet (17) are located on the high-pressure side thereof.

Die Funktionsweise der beschriebenen Einrichtung ist ausgehend von der in der Figur dargestellten Stellung etwa folgende:Starting from the position shown in the figure, the functioning of the described device is approximately as follows:

Von der Einspritzpumpe wird durch den Zulauf(17), den Druckraum(18), den Ventilsitz(4), den Innenraum(5) und den jeweils angeschlossenen Ablauf(13 oder 21) Kraftstoff gefördert. Dabei baut sich im Druckraum(18) kein Druck auf, so daß die Einspritzdüse geschlossen ist. Die Druckfeder(7) hält den Ventilsitz(4) offen.Fuel is supplied by the injection pump through the inlet (17), the pressure chamber (18), the valve seat (4), the interior (5) and the outlet (13 or 21) connected in each case. No pressure builds up in the pressure chamber (18), so that the injection nozzle is closed. The compression spring (7) keeps the valve seat (4) open.

Wird nun das Antriebselement(16), beispielsweise elektronisch gesteuert, betätigt, dann drückt es über das Spielausgleichselement(15) das Becherteil(10) auf den Ventilkörper(2), so daß der Ventilsitz(4) gegen die Kraft der Druckfeder(7) schließt. Im Druckraum(18) baut sich ein hoher Druck, beispielsweise 1000 bar, auf, der die Einspritzdüse öffnet.If the drive element (16) is actuated, for example electronically controlled, then it presses the cup part (10) onto the valve body (2) via the play compensation element (15) so that the valve seat (4) counteracts the force of the compression spring (7). closes. A high pressure, for example 1000 bar, builds up in the pressure chamber (18) and opens the injection nozzle.

Die auf den Ventilsitz(4) zu übertragende Zuhaltekraft ist vergleichsweise gering, da der Ventilsitzdurchmesser(D2) und der Führungsdurchmesser(D1) im wesentlichen gleich groß sind.The locking force to be transmitted to the valve seat (4) is comparatively low, since the valve seat diameter (D2) and the guide diameter (D1) are essentially the same size.

Solange der Ventilkörper(2) in Schließstellung gehalten ist, tritt zwangsläufig längs der Außenfläche(2′) des Ventilkörpers(2) Kraftstoff aus dem Druckraum(18) in den Ablauf(13). Die Schließstellung bleibt dabei jedoch aufrechterhalten.As long as the valve body (2) is held in the closed position, fuel inevitably occurs along the outer surface (2 ') of the valve body (2) from the pressure chamber (18) in the outlet (13). However, the closed position is maintained.

Schaltet das Antriebselement(16) ab, dann verschiebt sich der Ventilkörper(2) unter der Wirkung der Druckfeder(7). Die Öffnungswirkung ist dadurch unterstützt, daß der Ventilsitzdurchmesser(D2) geringfügig kleiner als der Führungsdurchmesser(D1) ist. Beim öffnen des Ventilsitzes(4) baut sich der im Druckraum(18) herrschende Druck schnell über den Innenraum(5) ab.If the drive element (16) switches off, the valve body (2) moves under the action of the compression spring (7). The opening effect is supported by the fact that the valve seat diameter (D2) is slightly smaller than the guide diameter (D1). When the valve seat (4) is opened, the pressure prevailing in the pressure chamber (18) quickly decreases via the interior (5).

Claims (2)

  1. Control device for a fuel injection nozzle of an internal combustion engine, in particular of a diesel engine, comprising a tubular valve body (2) displaceably guided on a guide diameter (D1) in a valve housing (1) and controlled by a driving element (16), which valve body is able to bear by one of its ends against a valve seat (4) on the valve housing (1) and comprises an inner space (5), a compression spring (7) acting against the force of the driving element (16) being supported on the valve body (2), the control device further comprising a fuel pressure chamber (18) arranged in the valve housing (1) between a fuel inlet (17) and the valve seat (4), said valve seat being arranged opposite the end of the valve body (2) located near the inlet (17), wherein injection pressure for the injection nozzle is built up in the pressure chamber (18) when the valve is closed and pressure equalisation between the pressure chamber (18) and a fuel outlet (13) is effected when the valve is open, said pressure chamber (18) being in communication with the outlet (13) via the valve seat (4) and the inner space (5), characterized in that a stop ring (9) is associated with the end edge (8) of the tubular valve body (2) facing away from the valve seat (4), a cup member (10) for driving the valve body (2) is disposed on this end edge (8) and comprises openings (12) through which the inner space (5) of the valve body (2) communicates with the outlet (13), and the compression spring (7) bears against the inside of the valve body (2) via a snap ring (6).
  2. Control device according to claim 1, characterized in that the valve seat diameter (D2) on the valve body (2) is smaller than the guide diameter (D1) of the valve body (2).
EP89112156A 1988-07-20 1989-07-04 Control device for a fuel injection nozzle Expired - Lifetime EP0351631B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3824644A DE3824644A1 (en) 1988-07-20 1988-07-20 CONTROL DEVICE FOR A FUEL INJECTION NOZZLE
DE3824644 1988-07-20

Publications (2)

Publication Number Publication Date
EP0351631A1 EP0351631A1 (en) 1990-01-24
EP0351631B1 true EP0351631B1 (en) 1992-11-11

Family

ID=6359152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89112156A Expired - Lifetime EP0351631B1 (en) 1988-07-20 1989-07-04 Control device for a fuel injection nozzle

Country Status (4)

Country Link
US (1) US5137256A (en)
EP (1) EP0351631B1 (en)
JP (1) JPH0267457A (en)
DE (2) DE3824644A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8967591B2 (en) * 2011-02-24 2015-03-03 Wabtec Holding Corp. Trip cock fault detector

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633857A (en) * 1949-07-06 1953-04-07 Worthington Corp Governor steam control and emergency valve for steam turbines
DD122574A1 (en) * 1975-10-24 1976-10-12 Karl Marx Stadt Automobilbau
US4392612A (en) * 1982-02-19 1983-07-12 General Motors Corporation Electromagnetic unit fuel injector
US4463900A (en) * 1983-01-12 1984-08-07 General Motors Corporation Electromagnetic unit fuel injector
US4550875A (en) * 1984-08-06 1985-11-05 General Motors Corporation Electromagnetic unit fuel injector with piston assist solenoid actuated control valve
DE3704739A1 (en) * 1987-02-14 1988-06-09 Daimler Benz Ag Piezoelectric control valve

Also Published As

Publication number Publication date
DE58902666D1 (en) 1992-12-17
JPH0267457A (en) 1990-03-07
US5137256A (en) 1992-08-11
DE3824644A1 (en) 1990-01-25
EP0351631A1 (en) 1990-01-24

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