EP0916022B1 - Cut-off for an internal combustion engine - Google Patents

Cut-off for an internal combustion engine Download PDF

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Publication number
EP0916022B1
EP0916022B1 EP97938863A EP97938863A EP0916022B1 EP 0916022 B1 EP0916022 B1 EP 0916022B1 EP 97938863 A EP97938863 A EP 97938863A EP 97938863 A EP97938863 A EP 97938863A EP 0916022 B1 EP0916022 B1 EP 0916022B1
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EP
European Patent Office
Prior art keywords
valve body
fuel injection
injection system
engine
inlet port
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
EP97938863A
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German (de)
French (fr)
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EP0916022A1 (en
Inventor
Herbert Geier
Günter Kampichler
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Motorenfabrik Hatz GmbH and Co KG
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Motorenfabrik Hatz GmbH and Co KG
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Publication of EP0916022A1 publication Critical patent/EP0916022A1/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
    • 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
    • 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
    • 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
    • F02M63/0205—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 for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • 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
    • F02M63/0205—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 for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/0215—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 for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits

Definitions

  • the invention relates to a fuel injection system for an internal combustion engine, in which for engine shutdown an interruption in fuel supply is provided.
  • Engine shutdowns or engine emergency shutdowns are already from the prior art, e.g. for the Operating truck diesel engines, known.
  • Such Devices are primarily for auto-igniting Internal combustion engines necessary to the engine shutdown or the engine in emergency situations turn off mechanically or automatically.
  • the engine is switched off by self-igniting Internal combustion engines the fuel supply interrupted, as this effectively continues can be prevented.
  • the injection pump is set to zero delivery, or through so-called fuel shut-off valves.
  • These valves are in the supply line to the injection pump, if possible immediately in front, attached and interrupt the Fuel supply with the disadvantage that the remaining Fuel volume between injection pump and Valve must be consumed and therefore the engine one runs for a certain time or overclocked. This is therefore not suitable for an emergency stop.
  • JP 06336962 A An attempt to avoid these disadvantages is given in JP 06336962 A is undertaken. It becomes spherical Valve body described on a return cable are attached. In the event of a trigger, the Valve body due to the negative pressure in the valve seat be sucked into the suction hole. Another Attempt the above To avoid disadvantages is in the DE 3122250 A1 undertaken. In it becomes an electric actuated, guided in a bore valve to Interruption of fuel supply proposed.
  • GB 996032 A also describes Emergency shutdown valve for an injection pump, the is operated electromagnetically. With this valve the fuel supply is rigid only valve tappet with little play between Fuel pump and distributor interrupted.
  • US-A-4497298 describes a pump control valve which prevents "valve pounding" should be that a damping material over a certain length of the valve stem is used.
  • the object of the present invention is now a simple and inexpensive engine shutdown or to provide a quick emergency stop, the also insensitive to assembly tolerances is.
  • the fuel injection system has a pump element with suction hole, whereby for interruption the fuel supply, the suction hole on the pump element is lockable and for closing the a self-centering suction hole forming a valve seat Valve body is provided, the Valve body attached to a flexible tappet is.
  • the self-centering valve body guaranteed in a surprisingly simple way that the suction hole is always securely sealed regardless of the exact location caused by the Screw-in position of the fuel injection pump in the Housing is defined and thus certain assembly tolerances subject to.
  • the present invention further provides that the self-centering valve body is conical or has a hemispherical sealing surface.
  • valve body fits in advantageously the conical or hemispherical trained valve seat of the suction hole.
  • the flexible Plunger is designed as a spring plunger.
  • the plunger can either be made of spring steel or a flexible plastic material or any other suitable elastic material.
  • the valve body itself can then e.g. over a shaft be connected to the plunger.
  • valve body is spring loaded.
  • an embodiment according to the invention provides before that the engine shutdown can be operated manually is.
  • the valve body can, for example, have a Bowden cable are brought into the closed position.
  • the Engine shutdown can be controlled automatically.
  • the shutdown takes place automatically when faults occur, e.g. to low oil pressure, excessive cylinder head temperature, Overspeed, etc.
  • the shutdown in generally take place via a regulation in which a Signaling device indicates the fault and the emergency shutdown activated.
  • the suction hole by electrical actuation of the valve body, e.g. B. powerless, lockable.
  • Figure 1 shows an "engine quick stop” or engine shutdown device 1, which is operated electrically.
  • 1 is the fuel injection pump 2 with the suction bore designed as a valve seat 3 shown leading to the fuel supply channel 4 is screwed open into the housing 5.
  • the fuel supply channel 4 is the plunger 6, at its front end, the valve body 7 located.
  • the electric engine shutdown device 1 is flanged to the housing 5 via screws 8.
  • the seal 9 prevents that fuel from the fuel supply channel 4th exit.
  • the compression spring 25 slides over the core 11 when the power is switched off, the plunger 6 in the direction of Suction hole 3. Furthermore, the fuel return channel 12 recognizable.
  • the engine shutdown device 13 mechanically operated.
  • the one with the injection pump 2 connected components and the Suction hole 3 and the valve body 7 correspond to the Components already described in Fig. 1, so that on these parts are not described again shall be.
  • the engine shutdown device 13 has the valve body 7, which with the flexible plunger 6th is connected and guided by the guide body 14 is, the sealing ring 15 and the pressure plate 16, the is connected to the housing 5 by screws 17, on. Furthermore, is connected to the plunger 6 Pressure pin 18, which is provided with a casing 19 is shown, which with a compression spring 26 in Standby position is held.
  • valve body 7 By pressing the push pin 18 elastic plunger 6 with the valve body 7 in Moved towards the suction hole 3, the Spring pressure of the spring 26 must be overcome. By Installation tolerances and due to settings the center line of the plunger 6 does not pass through the center the bore 3. Due to its hemispherical design the valve body 7 automatically centers itself in the conical valve seat of the suction hole 3 The valve body 7 first touches an edge of the Valve seat of the suction hole 3. Through the conical Shape of the valve seat and a corresponding Low-friction surface quality can also be avoided Material with low-friction surface properties manufactured valve body 7 slide into the valve seat. The plunger 6 deforms elastically.
  • Fig. 3 shows a detailed representation of the elastic Tappet 6, which is helical and the valve body 7 at one end thereof is connected via a shaft 20. Furthermore 3 shows the pump neck 21 with the suction bore 3, which has a conical valve seat 22. Moreover is a leak hole 23 on the suction hole 3 opposite pump neck side recognizable.

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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 Kraftstoffeinspritzanlage für eine Brennkraftmaschine, bei welcher zur Motorabschaltung eine Unterbrechung der Kraftstoffversorgung vorgesehen ist.The invention relates to a fuel injection system for an internal combustion engine, in which for engine shutdown an interruption in fuel supply is provided.

Motorabschaltungen bzw. Motornotabschaltungen sind bereits aus dem Stand der Technik, z.B. für das Betreiben von LKW-Dieselmotoren, bekannt. Derartige Vorrichtungen sind in erster Linie bei selbstzündenden Brennkraftmaschinen notwendig, um den Motor stillzusetzen oder bei Notsituationen den Motor mechanisch oder automatisch abzustellen.Engine shutdowns or engine emergency shutdowns are already from the prior art, e.g. for the Operating truck diesel engines, known. Such Devices are primarily for auto-igniting Internal combustion engines necessary to the engine shutdown or the engine in emergency situations turn off mechanically or automatically.

In der Regel wird zum Motorabschalten von selbstzündenden Brennkraftmaschinen die Kraftstoffzufuhr unterbrochen, da hierdurch ein Weiterlaufen effektiv unterbunden werden kann. Dies geschieht in der Regel bei Ein- oder Mehrzylindern im Baumaschinen- und Industriebereich durch den Drehzahlverstellhebel, der die Einspritzpumpe auf Nullförderung stellt, oder durch sog. Kraftstoffabsperrventile. Diese Ventile sind in der Zuleitung zur Einspritzpumpe, möglichst unmittelbar davor, angebracht und unterbrechen die Kraftstoffzufuhr mit dem Nachteil, daß das verbleibende Kraftstoffvolumen zwischen Einspritzpumpe und Ventil verbraucht werden muß und damit der Motor eine gewisse Zeit nachläuft bzw. nachtaktet. Dies ist damit für eine Notabstellung nicht geeignet.Usually, the engine is switched off by self-igniting Internal combustion engines the fuel supply interrupted, as this effectively continues can be prevented. This usually happens for single or multi-cylinders in construction machinery and Industrial area through the speed adjustment lever, the the injection pump is set to zero delivery, or through so-called fuel shut-off valves. These valves are in the supply line to the injection pump, if possible immediately in front, attached and interrupt the Fuel supply with the disadvantage that the remaining Fuel volume between injection pump and Valve must be consumed and therefore the engine one runs for a certain time or overclocked. This is therefore not suitable for an emergency stop.

Des weiteren ist aus dem Stand der Technik bekannt, daß bei kritischen Betriebsbedingungen, z.B. bei Überdrehzahl, die Kraftstoffzufuhr unterbrochen wird. Dies kann, z.B. bei einer elektronischen Einspritzpumpe durch Unterbrechung der Kraftstoffzufuhr mittels Abschaltung der Kraftstoffeinspritzung erfolgen.Furthermore, it is known from the prior art that in critical operating conditions, e.g. at Overspeed, the fuel supply is interrupted. This can e.g. with an electronic injection pump by interrupting the fuel supply by switching off the fuel injection respectively.

Alle diese Motorabschaltungen sind technisch aufwendig und daher mit erheblichen Kosten verbunden, besonders dann, wenn eine Freigabe der Startbereitschaft manuelle Arbeiten erfordert und der Ort des Geschehens sich an unzugänglichen Stellen befindet.All of these engine shutdowns are technically complex and therefore associated with considerable costs, especially when the readiness to start is released requires manual work and the location of the Happening in inaccessible places.

Ein Versuch, diese Nachteile zu vermeiden, wird in der JP 06336962 A unternommen. Darin werden kugelförmige Ventilkörper beschrieben, die an einem Rückholseilzug befestigt sind. Im Auslösefall sollen die Ventilkörper durch den Unterdruck in den Ventilsitz in der Saugbohrung angesaugt werden. Ein weiterer Versuch, die o.g. Nachteile zu umgehen, wird in der DE 3122250 A1 unternommen. Darin wird ein elektrisch betätigtes, in einer Bohrung geführtes Ventil zum Unterbrechen der Kraftstoffzufuhr vorgeschlagen.An attempt to avoid these disadvantages is given in JP 06336962 A is undertaken. It becomes spherical Valve body described on a return cable are attached. In the event of a trigger, the Valve body due to the negative pressure in the valve seat be sucked into the suction hole. Another Attempt the above To avoid disadvantages is in the DE 3122250 A1 undertaken. In it becomes an electric actuated, guided in a bore valve to Interruption of fuel supply proposed.

Ferner beschreibt die GB 996032 A ein Notabschaltventil für eine Einspritzpumpe, das elektromagnetisch betätigt wird. Mit diesem Ventil wird die Kraftstoffzufuhr mittels eines starren nur geringes Spiel aufweisenden Ventilstößels zwischen Kraftstoffpumpe und Verteiler unterbrochen.GB 996032 A also describes Emergency shutdown valve for an injection pump, the is operated electromagnetically. With this valve the fuel supply is rigid only valve tappet with little play between Fuel pump and distributor interrupted.

Die US-A-4497298 beschreibt ein Pumpensteuerventil, bei dem ein "Ventil-Schlagen" dadurch verhindert werden soll, daß ein dämpfendes Material über eine gewisse Länge des Ventilschafts verwendet wird.US-A-4497298 describes a pump control valve which prevents "valve pounding" should be that a damping material over a certain length of the valve stem is used.

Aufgabe der vorliegenden Erfindung ist es nun, eine einfache und kostengünstige Motorabschaltung bzw. einen schnellen Notstop vorzusehen, die bzw. der außerdem gegenüber Montagetoleranzen unempfindlich ist.The object of the present invention is now a simple and inexpensive engine shutdown or to provide a quick emergency stop, the also insensitive to assembly tolerances is.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.This object is achieved by the features of claim 1 solved.

Dabei weist die Kraftstoffeinspritzanlage ein Pumpenelement mit Saugbohrung auf, wobei zur Unterbrechung der Kraftstoffversorgung die Saugbohrung am Pumpenelement verschließbar ist und zum Verschließen der einen Ventilsitz bildenden Saugbohrung ein selbstzentrierender Ventilkörper vorgesehen ist, wobei der Ventilkörper an einem flexiblen Stößel angebracht ist.The fuel injection system has a pump element with suction hole, whereby for interruption the fuel supply, the suction hole on the pump element is lockable and for closing the a self-centering suction hole forming a valve seat Valve body is provided, the Valve body attached to a flexible tappet is.

Durch diese Maßnahme werden in überraschend einfacher Weise gleich mehrere Vorteile erzielt. So wird durch das Anbringen des Ventilkörpers an einem flexiblen Stößel ein montagebedingter Versatz zwischen der Achse des Stößels und dem Zentrum der Saugbohrung ausgeglichen. Dies erleichtert das Hineingleiten des Ventilkörpers in den Ventilsitz und gewährleistet dadurch den sicher dichtenden Sitz des Ventilkörpers. Ferner wird die Kraftstoffzufuhr kurz vor dem Einspritzpumpenelement unterbrochen, was einen sofortigen Motorstop bewirkt, und zum anderen wird ein Nachlaufen und Nachtakten des Motors vermieden, weil kein Schadvolumen verbraucht werden muß. Das Pumpenelement ist direkt im Motorgehäuse an gut zugänglicher Stelle positioniert, was eine Anbringung der Abstelleinrichtung sowohl in manueller als auch in elektrischer Ausführung erleichtert. Des weiteren schreiben EU-Sicherheitsvorschriften eine zweite unabhänginge Motorabschaltung vor, was bei zusätzlichem Anbringen der erfindungsgemäßen Vorrichtung auch abgedeckt ist.This measure will be surprisingly easier Way achieved several advantages. So through attaching the valve body to a flexible Ram an assembly-related offset between the Axis of the ram and the center of the suction hole balanced. This makes it easier to slide the Valve body in the valve seat and guaranteed thereby the securely sealing seat of the valve body. Furthermore, the fuel supply shortly before Injection pump element interrupted what a immediate engine stop, and on the other hand avoid overrun and overclocking of the engine, because no damage volume has to be consumed. The Pump element is good in the motor housing accessible location, what an attachment the parking facility in both manual and relieved in electrical execution. Furthermore EU security regulations write a second independent engine shutdown before what additional attachment of the invention Device is also covered.

Weiterhin wird durch den selbstzentrierenden Ventilkörper auf überraschend einfache Weise gewährleistet, daß das Saugloch immer sicher dicht verschlossen wird, unabhängig von der exakten Lage, die durch die Einschraubposition der Kraftstoffeinspritzpumpe im Gehäuse definiert ist und somit gewissen Montagetoleranzen unterliegt. Furthermore, the self-centering valve body guaranteed in a surprisingly simple way that the suction hole is always securely sealed regardless of the exact location caused by the Screw-in position of the fuel injection pump in the Housing is defined and thus certain assembly tolerances subject to.

Des weiteren sieht die vorliegende Erfindung vor, daß der selbstzentrierende Ventilkörper eine konische oder halbkugelförmige Dichtfläche aufweist.The present invention further provides that the self-centering valve body is conical or has a hemispherical sealing surface.

Diese Formgebung des Ventilkörpers paßt sich in vorteilhafter Weise dem konisch oder halbkugelförmig ausgebildeten Ventilsitz des Sauglochs an.This shape of the valve body fits in advantageously the conical or hemispherical trained valve seat of the suction hole.

Außerdem ist es höchst vorteilhaft, daß der flexible Stößel als Federstößel ausgebildet ist.It is also highly advantageous that the flexible Plunger is designed as a spring plunger.

Dabei kann der Stößel sowohl aus Federstahl oder aus einem flexiblen Kunststoffmaterial oder jedem anderen geeigneten elastischen Material hergestellt sein. Der Ventilkörper selbst kann dann z.B. über einen Schaft mit dem Stößel verbunden werden.The plunger can either be made of spring steel or a flexible plastic material or any other suitable elastic material. The The valve body itself can then e.g. over a shaft be connected to the plunger.

Weiterhin ist es vorteilhaft, daß der Ventilkörper federbelastet ist.It is also advantageous that the valve body is spring loaded.

Dies ermöglicht zum Beispiel, daß bei einer automatisch betätigten Notabschaltung der Ventilkörper bei Stromausfall automatisch durch die Federwirkung in die Sauglochbohrung geschoben wird. Diese "Fail-Safe-Funktion" gestaltet das System besonders sicher.This enables, for example, an automatic actuated emergency shutdown of the valve body Power failure automatically due to the spring action the suction hole is pushed. This "fail-safe function" makes the system particularly secure.

Des weiteren sieht eine erfindungsgemäße Ausführungsform vor, daß die Motorabschaltung manuell betätigbar ist.Furthermore, an embodiment according to the invention provides before that the engine shutdown can be operated manually is.

Dabei kann der Ventilkörper beispielsweise über einen Bowdenzug in die Verschlußstellung gebracht werden.The valve body can, for example, have a Bowden cable are brought into the closed position.

Weiterhin ist es erfindungsgemäß vorteilhaft, daß die Motorabschaltung automatisch ansteuerbar ist. It is also advantageous according to the invention that the Engine shutdown can be controlled automatically.

Bei dieser Ausführungsform erfolgt die Abschaltung automatisch bei Auftreten von Störungen, wie z.B. zu niedrigem Öldruck, überhöhter Zylinderkopftemperatur, Überdrehzahl, usw. Dabei wird die Abschaltung im allgemeinen über eine Regelung erfolgen, bei der ein Signalgeber die Störung anzeigt und die Notabschaltung aktiviert.In this embodiment, the shutdown takes place automatically when faults occur, e.g. to low oil pressure, excessive cylinder head temperature, Overspeed, etc. The shutdown in generally take place via a regulation in which a Signaling device indicates the fault and the emergency shutdown activated.

Schließlich sieht eine vorteilhafte Ausführungsform der vorliegenden Erfindung vor, daß die Saugbohrung durch elektrische Betätigung des Ventilkörpers, z. B. stromlos setzen, verschließbar ist.Finally, see an advantageous embodiment the present invention that the suction hole by electrical actuation of the valve body, e.g. B. powerless, lockable.

Dies kann in der Weise erfolgen, daß der an dem Stößel befindliche Ventilkörper durch eine als Elektromagnet wirkende Spule gegen die Federbelastung zurückgehalten wird und bei Unterbrechung der Stromzufuhr aufgrund der Federbelastung in den Ventilsitz gedrückt wird.This can be done in such a way that the Valve body located by a as Electromagnet acting coil against the spring load is held back and when the power supply is interrupted due to the spring load in the valve seat is pressed.

Vorteilhafte Ausführungsformen der vorliegenden Erfindung werden im folgenden anhand der beigefügten Zeichnungen in Verbindung mit der folgenden Beschreibung näher erläutert. Dabei zeigen

Fig. 1
eine Ausführungsform der vorliegenden Erfindung, wobei die Betätigung der Motorabschaltung elektrisch erfolgt;
Fig. 2
eine Ausführungsform der vorliegenden Erfindung, wobei die Motorabschaltung mechanisch erfolgt; und
Fig. 3
eine Detailzeichnung, die den Ventilkörper und die Saugbohrung darstellt.
Advantageous embodiments of the present invention are explained in more detail below with reference to the accompanying drawings in conjunction with the following description. Show
Fig. 1
an embodiment of the present invention, wherein the actuation of the engine shutdown takes place electrically;
Fig. 2
an embodiment of the present invention, wherein the engine shutdown takes place mechanically; and
Fig. 3
a detailed drawing showing the valve body and the suction hole.

Fig. 1 zeigt eine "Motorquickstop-" oder Motorabschaltvorrichtung 1, die elektrisch betätigt wird. Des weiteren ist in Fig. 1 die Kraftstoffeinspritzpumpe 2 mit der als Ventilsitz ausgebildeten Saugbohrung 3 gezeigt, die zum Kraftstoffzufuhrkanal 4 hin offen in das Gehäuse 5 eingeschraubt ist. In dem Kraftstoffzufuhrkanal 4 befindet sich der Stößel 6, an dessen vorderen Ende sich der Ventilkörper 7 befindet. Die elektrische Motorabschaltvorrichtung 1 ist über Schrauben 8 an das Gehäuse 5 angeflanscht. Des weiteren wird durch die Dichtung 9 verhindert, daß Kraftstoff aus dem Kraftstoffzufuhrkanal 4 austritt. Die Druckfeder 25 schiebt über den Kern 11 bei Stromabschaltung den Stößel 6 in Richtung der Saugbohrung 3. Des weiteren ist der Kraftstoffrücklaufkanal 12 zu erkennen.Figure 1 shows an "engine quick stop" or engine shutdown device 1, which is operated electrically. 1 is the fuel injection pump 2 with the suction bore designed as a valve seat 3 shown leading to the fuel supply channel 4 is screwed open into the housing 5. By doing The fuel supply channel 4 is the plunger 6, at its front end, the valve body 7 located. The electric engine shutdown device 1 is flanged to the housing 5 via screws 8. Furthermore, the seal 9 prevents that fuel from the fuel supply channel 4th exit. The compression spring 25 slides over the core 11 when the power is switched off, the plunger 6 in the direction of Suction hole 3. Furthermore, the fuel return channel 12 recognizable.

Bei Betätigung der Motorabschaltvorrichtung 1 wird im vorliegenden Fall Spannung von der Spule 10 genommen, wodurch die Druckfeder 25 den schwimmenden Kern 11 aus der Spule 10 herausschiebt. Dadurch wird der mit dem Kern 11 verbundene flexible Stößel 6 in Richtung der Saugbohrung 3 verschoben. Dabei ist deutlich zu erkennen, daß die Mittellinie des Stößels 6 und damit die Mittellinie des mit dem Stößel verbundenen Ventilkörpers 7 parallel oberhalb zu der Mittellinie der Saugbohrung 3 verläuft. Durch die halbkugelförmige Ausbildung des Ventilkörpers 7 und die flexible Gestaltung des Stößels 6 zentriert sich der Ventilkörper 7 automatisch in dem Ventilsitz der Saugbohrung 3. Bei Anlegen einer Spannung an die Spule 10 wird der Eisenkern 11 in die Spule hineingezogen und damit der Kraftstoffzulauf zum Saugloch 3 des Pumpenelementes freigegeben. Damit ist die Startbereitschaft erreicht. When the engine shutdown device 1 is actuated in the present case, voltage is removed from the coil 10, whereby the compression spring 25 the floating core 11th slides out of the coil 10. This means that with the core 11 connected flexible plunger 6 in the direction the suction hole 3 shifted. It is clearly too recognize that the center line of the plunger 6 and thus the center line of the connected to the ram Valve body 7 parallel above the center line the suction bore 3 runs. Through the hemispherical Formation of the valve body 7 and the flexible Design of the plunger 6 centers the valve body 7 automatically in the valve seat of the suction hole 3. When a voltage is applied to the coil 10 the iron core 11 is drawn into the coil and thus the fuel supply to the suction hole 3 of the pump element Approved. This is the readiness to start reached.

Fig. 2 zeigt eine weitere Ausführungsform der vorliegenden Erfindung. Dabei ist die Motorabschaltvorrichtung 13 mechanisch betätigbar. Die mit der Einspritzpumpe 2 zusammenhängenden Bauelemente sowie die Saugbohrung 3 und der Ventilkörper 7 entsprechen den in Fig. 1 bereits beschriebenen Bauteilen, so daß auf eine erneute Beschreibung dieser Teile verzichtet werden soll. Die Motorabschaltvorrichtung 13 weist den Ventilkörper 7, der mit dem flexiblen Stößel 6 verbunden ist und durch den Führungskörper 14 geführt wird, den Dichtring 15 sowie die Druckplatte 16, die durch Schrauben 17 mit dem Gehäuse 5 verbunden ist, auf. Des weiteren ist der mit dem Stößel 6 verbundene Druckstift 18, der mit einer Ummantelung 19 versehen ist, dargestellt, welcher mit einer Druckfeder 26 in Bereitschaftsposition gehalten wird.2 shows another embodiment of the present Invention. The engine shutdown device 13 mechanically operated. The one with the injection pump 2 connected components and the Suction hole 3 and the valve body 7 correspond to the Components already described in Fig. 1, so that on these parts are not described again shall be. The engine shutdown device 13 has the valve body 7, which with the flexible plunger 6th is connected and guided by the guide body 14 is, the sealing ring 15 and the pressure plate 16, the is connected to the housing 5 by screws 17, on. Furthermore, is connected to the plunger 6 Pressure pin 18, which is provided with a casing 19 is shown, which with a compression spring 26 in Standby position is held.

Durch die Betätigung des Druckstifts 18 wird der elastische Stößel 6 mit dem Ventilkörper 7 in Richtung der Saugbohrung 3 verschoben, wobei der Federdruck der Feder 26 überwunden werden muß. Durch Montagetoleranzen und einstellungsbedingt verläuft die Mittellinie des Stößels 6 nicht durch das Zentrum der Bohrung 3. Durch seine halbkugelförmige Ausbildung zentriert sich der Ventilkörper 7 automatisch in dem konischen Ventilsitz der Saugbohrung 3. Dabei berührt der Ventilkörper 7 zunächst eine Kante des Ventilsitzes der Saugbohrung 3. Durch die konische Formgebung des Ventilsitzes und eine entsprechend reibungsarme Oberflächengüte kann der ebenfalls aus Material mit reibungsarmer Oberflächenbeschaffenheit gefertigte Ventilkörper 7 in den Ventilsitz gleiten. Dabei verformt sich der Stößel 6 elastisch. By pressing the push pin 18 elastic plunger 6 with the valve body 7 in Moved towards the suction hole 3, the Spring pressure of the spring 26 must be overcome. By Installation tolerances and due to settings the center line of the plunger 6 does not pass through the center the bore 3. Due to its hemispherical design the valve body 7 automatically centers itself in the conical valve seat of the suction hole 3 The valve body 7 first touches an edge of the Valve seat of the suction hole 3. Through the conical Shape of the valve seat and a corresponding Low-friction surface quality can also be avoided Material with low-friction surface properties manufactured valve body 7 slide into the valve seat. The plunger 6 deforms elastically.

Fig. 3 zeigt eine Detaildarstellung des elastischen Stößels 6, der schraubenfederförmig ausgebildet ist und der an seinem einen Ende mit dem Ventilkörper 7 über einen Schaft 20 verbunden ist. Des weiteren zeigt Fig. 3 den Pumpenhals 21 mit der Saugbohrung 3, die einen konischen Ventilsitz 22 aufweist. Außerdem ist eine Leckagebohrung 23 auf der der Saugbohrung 3 gegenüberliegenden Pumpenhalsseite erkennbar.Fig. 3 shows a detailed representation of the elastic Tappet 6, which is helical and the valve body 7 at one end thereof is connected via a shaft 20. Furthermore 3 shows the pump neck 21 with the suction bore 3, which has a conical valve seat 22. Moreover is a leak hole 23 on the suction hole 3 opposite pump neck side recognizable.

In Fig. 3 ist deutlich zu erkennen, daß die Mittellinie des Stößels 6 zu derjenigen der Saugbohrung 3 versetzt verläuft. Durch die Vorwärtsbewegung des Stößels 6 wird der halbkugelförmige Ventilkörper 7 gegen die Kante des Ventilsitzes 22 gedrückt. Durch die elastische Ausbildung des Stößels 6 läßt dieser eine Verformung zu, so daß ein Fluchten des Ventilkörpers 7 in den konischen Ventilsitz 22 möglich wird. Dies ist in strichpunktierten Linien dargestellt. Dabei gibt der Stößel 6 nur soweit nach, daß während der Vorwärtsbewegung ein Selbstzentrieren des Ventilkörpers stattfinden kann. Sobald eine Umfangslinie des Ventilkörpers den Ventilsitz 22 dichtend berührt, wird die Kraftstoffzufuhr in die Kraftstoffeinspritzpumpe ohne Nachlaufen des Motors unterbrochen.In Fig. 3 it can be clearly seen that the center line of the plunger 6 to that of the suction bore 3 staggered. By moving forward Ram 6 becomes hemispherical valve body 7 pressed against the edge of the valve seat 22. By the elastic design of the plunger 6 leaves it a deformation too, so that an alignment of the valve body 7 possible in the conical valve seat 22 becomes. This is shown in dash-dotted lines. The plunger 6 only yields to the extent that self-centering of the Valve body can take place. Once a perimeter of the valve body sealing the valve seat 22 Touches the fuel supply to the fuel injection pump without engine overrun interrupted.

Claims (7)

  1. Fuel injection system for an internal combustion engine in which the fuel supply is interrupted to cut off the engine, the fuel injection system having a pump unit with an inlet port (3), the inlet port (3) at the pump unit being closable to stop the fuel supply and a self-centring valve body (7) being provided to close the inlet port (3) forming a valve seat, characterised in that the valve body (7) is arranged on a resilient tappet (6) to allow self-centring even in the case of an assembly-related offset between the axis of the tappet (6) and the centre of the inlet port (3).
  2. Fuel injection system according to Claim 1, characterised in that the self-centring valve body (7) has a conical or semi-spherical sealing face.
  3. Fuel injection system according to Claim 1, characterised in that the resilient tappet (6) is designed as a spring tappet.
  4. Fuel injection system according to the Claim 1, characterised in that the valve body (7) is spring-loaded.
  5. Fuel injection system according to Claim 1, characterised in that the inlet port (3) is closable by mechanical actuation of the valve body (7).
  6. Fuel injection system according to Claim 1, characterised in that the engine cut-off is automatically controllable.
  7. Fuel injection system according to Claim 1, characterised in that the inlet port (3) is closable by electrical actuation of the valve body (7).
EP97938863A 1996-08-05 1997-08-01 Cut-off for an internal combustion engine Expired - Lifetime EP0916022B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19631655 1996-08-05
DE19631655A DE19631655C2 (en) 1996-08-05 1996-08-05 Engine shutdown for an internal combustion engine
PCT/EP1997/004208 WO1998005862A1 (en) 1996-08-05 1997-08-01 Cut-off for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP0916022A1 EP0916022A1 (en) 1999-05-19
EP0916022B1 true EP0916022B1 (en) 2001-12-19

Family

ID=7801883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97938863A Expired - Lifetime EP0916022B1 (en) 1996-08-05 1997-08-01 Cut-off for an internal combustion engine

Country Status (5)

Country Link
US (1) US6101997A (en)
EP (1) EP0916022B1 (en)
JP (1) JP2000515602A (en)
DE (2) DE19631655C2 (en)
WO (1) WO1998005862A1 (en)

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DE295420C (en) *
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GB1109387A (en) * 1964-06-30 1968-04-10 Schwermaschb Karl Liebknecht Improvements in or relating to devices for cutting off the fuel supply in injection type internal combustion engines
US3472481A (en) * 1965-10-22 1969-10-14 Air Reduction Self-aligning valve closure
DE2503345C2 (en) * 1975-01-28 1986-12-18 Robert Bosch Gmbh, 7000 Stuttgart Fuel injection pump for internal combustion engines
US4196886A (en) * 1975-07-21 1980-04-08 Industrial Electronic Rubber Co. Fluid control valve
DE3014712A1 (en) * 1980-04-17 1981-10-22 Robert Bosch Gmbh, 7000 Stuttgart CONTROL DEVICE FOR STOPPING A DIESEL INTERNAL COMBUSTION ENGINE
DE3122250A1 (en) * 1981-06-04 1982-12-23 Robert Bosch Gmbh, 7000 Stuttgart OVER-TURN LOCKING FOR FUEL INJECTION PUMPS FROM INTERNAL COMBUSTION ENGINES
JPH0650090B2 (en) * 1983-05-17 1994-06-29 日産自動車株式会社 Fuel cutoff valve for distributed fuel injection pump
US4497298A (en) * 1984-03-08 1985-02-05 General Motors Corporation Diesel fuel injection pump with solenoid controlled low-bounce valve
DE3427730A1 (en) * 1984-07-27 1986-02-06 Motorenfabrik Hatz Gmbh & Co Kg, 8399 Ruhstorf FUEL INJECTION SYSTEM
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Also Published As

Publication number Publication date
US6101997A (en) 2000-08-15
WO1998005862A1 (en) 1998-02-12
JP2000515602A (en) 2000-11-21
EP0916022A1 (en) 1999-05-19
DE19631655C2 (en) 2003-03-27
DE19631655A1 (en) 1998-02-12
DE59705902D1 (en) 2002-01-31

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