DE102012224408A1 - Fuel injection system e.g. common-rail injection system of internal combustion engine, has return-flow pipe whose downstream is connected with high-pressure pump that is integrated with spring-loaded valve which is check valve - Google Patents

Fuel injection system e.g. common-rail injection system of internal combustion engine, has return-flow pipe whose downstream is connected with high-pressure pump that is integrated with spring-loaded valve which is check valve Download PDF

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Publication number
DE102012224408A1
DE102012224408A1 DE201210224408 DE102012224408A DE102012224408A1 DE 102012224408 A1 DE102012224408 A1 DE 102012224408A1 DE 201210224408 DE201210224408 DE 201210224408 DE 102012224408 A DE102012224408 A DE 102012224408A DE 102012224408 A1 DE102012224408 A1 DE 102012224408A1
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Germany
Prior art keywords
pressure pump
injection system
fuel injection
valve
fuel
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Ceased
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DE201210224408
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German (de)
Inventor
Susanne Spindler
Christian Kuhnert
Stefan Kieferle
Martin Beck
Christian Schugger
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to DE201210224408 priority Critical patent/DE102012224408A1/en
Publication of DE102012224408A1 publication Critical patent/DE102012224408A1/en
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M63/0054—Check 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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

Abstract

The system has a high pressure pump (1) and a feed pump (2) that are provided, so that the suction of fuel from a fuel tank (3) and the promotion of high pressure through a feed line (4) of the high-pressure pump is enabled. A return-flow pipe (5) is provided for returning a leakage, lubricating and cooling amount of fuel. The downstream of the return-flow pipe is connected with the high-pressure pump integrated with a spring-loaded valve (6) which is a check valve or a relief valve. The return-flow pipe is attached to a thruster space (7) of the high pressure pump.

Description

Die Erfindung betrifft ein Kraftstoffeinspritzsystem mit den Merkmalen des Oberbegriffs des Anspruchs 1. The invention relates to a fuel injection system having the features of the preamble of claim 1.

Stand der Technik State of the art

Ein Kraftstoffeinspritzsystem der vorstehend genannten Art geht beispielsweise aus der Offenlegungsschrift DE 10 2010 043 923 A1 hervor. Es umfasst eine Hochdruckpumpe sowie eine Vorförderpumpe, mittels welcher der Hochdruckpumpe Kraftstoff aus einem Kraftstofftank zuführbar ist, um von der Hochdruckpumpe auf Hochdruck gefördert zu werden. Die Mengen- und Druckregelung erfolgt dabei über eine Zumesseinheit und/oder die Vorförderpumpe, die zu diesem Zweck als geregelte Elektrokraftstoffpumpe ausgelegt ist. Die Schmierung und/oder Kühlung der Hochdruckpumpe ist über eine parallel zu einem Zulauf der Hochdruckpumpe geschaltete Drossel sichergestellt. Über eine an die Hochdruckpumpe angeschlossene Rücklaufleitung wird die Schmier- und/oder Kühlmenge zurück in den Kraftstofftank geführt. Die Rücklaufleitung dient ferner der Rückführung einer Rücklaufmenge wenigstens eines Kraftstoffeinspritzventils, das der Einspritzung von Kraftstoff in einen Brennraum einer Brennkraftmaschine dient und an einen Hochdruckspeicher zur Speicherung des von der Hochdruckpumpe auf Hochdruck geförderten Kraftstoffs angeschlossen ist. A fuel injection system of the type mentioned above, for example, from the published patent application DE 10 2010 043 923 A1 out. It comprises a high-pressure pump and a prefeed pump by means of which the high-pressure pump fuel from a fuel tank can be fed to be promoted by the high-pressure pump to high pressure. The quantity and pressure control takes place via a metering unit and / or the prefeed pump, which is designed for this purpose as a regulated electric fuel pump. The lubrication and / or cooling of the high pressure pump is ensured via a parallel to an inlet of the high pressure pump connected throttle. About a connected to the high-pressure pump return line the lubricating and / or cooling amount is fed back into the fuel tank. The return line also serves to return a return amount of at least one fuel injection valve, which serves to inject fuel into a combustion chamber of an internal combustion engine and is connected to a high-pressure accumulator for storing the fuel pumped by the high-pressure pump to high pressure.

Ferner ist bekannt, bei Common-Rail-Einspritzsystemen, wie beispielhaft in der 1 dargestellt, ein nah an der Brennkraftmaschine angeordnetes Rückschlagventil zur Einstellung des Rücklaufgegendrucks an den Kraftstoffeinspritzventilen zu verwenden. Dieses muss bei Einspritzventilen, die als Magnetventile ausgelegt sind, einen engen Druckbereich zwischen nahezu dicht und Durchflüssen bis zu 45 l/h garantieren. Die Stützdruck-Randbedingungen können dabei sehr unterschiedlich sein. Zudem kann es durch kurzzeitige Druckunterschreitungen aufgrund von Druckpulsationen im Niederdruckkreis des Systems zu einem Druckeinbruch und damit zu Funktionsstörungen des Ventils kommen. Druckpulsationen im Niederdruckkreis werden insbesondere durch dynamische Effekte im Gegenspiel von Kraftstoffeinspritzventil und Hochdruckpumpe hervorgerufen. It is also known in common-rail injection systems, such as in the 1 illustrated to use a close to the internal combustion engine arranged check valve for adjusting the Rückrückgegendrucks to the fuel injection valves. In the case of injectors designed as solenoid valves, this must guarantee a narrow pressure range between almost tight and flow rates of up to 45 l / h. The support pressure boundary conditions can be very different. In addition, short-term pressure drops due to pressure pulsations in the low pressure circuit of the system can lead to a pressure drop and thus malfunction of the valve. Pressure pulsations in the low pressure circuit are caused in particular by dynamic effects in the counterplay of fuel injection valve and high pressure pump.

Ausgehend von dem vorstehend genannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Kraftstoffeinspritzsystem bereit zu stellen, das die vorstehend genannten Nachteile nicht oder zumindest in deutlich geminderter Form aufweist. Based on the above-mentioned prior art, the present invention has for its object to provide a fuel injection system that does not have the disadvantages mentioned above or at least in significantly reduced form.

Die Aufgabe wird gelöst durch ein Kraftstoffeinspritzsystem mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. The object is achieved by a fuel injection system having the features of claim 1. Advantageous developments of the invention are specified in the subclaims.

Offenbarung der Erfindung Disclosure of the invention

Das vorgeschlagene Kraftstoffeinspritzsystem, insbesondere Common-Rail- Einspritzsystem, umfasst eine Hochdruckpumpe und eine Vorförderpumpe, mittels welcher Kraftstoff aus einem Kraftstofftank ansaugbar und zur Förderung auf Hochdruck über eine Zulaufleitung der Hochdruckpumpe zuführbar ist. An die Hochdruckpumpe ist zur Rückführung einer Leckage-, Schmier- und/oder Kühlmenge eine Rücklaufleitung angeschlossen. Erfindungsgemäß ist in die Rücklaufleitung stromabwärts des Anschlusses der Hochdruckpumpe ein federbelastetes Ventil, insbesondere ein Rückschlagventil oder ein Überströmventil, integriert. Das stromabwärts des Anschlusses der Hochdruckpumpe in die Rücklaufleitung integrierte federbelastete Ventil vermag ein nah an der Brennkraftmaschine angeordnetes Rückschlagventil zu ersetzen, wobei es sich in dieser Anordnung als deutlich weniger störanfällig gegenüber Druckpulsationen erweist. Zudem werden die Temperaturanforderungen an das Ventil reduziert, da die Anordnung weiter entfernt von der Brennkraftmaschine erfolgt und das Ventil somit auf geringere Einsatztemperaturen ausgelegt werden kann. The proposed fuel injection system, in particular common-rail injection system, comprises a high-pressure pump and a prefeed pump, by means of which fuel from a fuel tank can be sucked and fed to promote high pressure via a supply line of the high-pressure pump. To the high-pressure pump, a return line is connected to return a leakage, lubrication and / or cooling. According to the invention, a spring-loaded valve, in particular a check valve or an overflow valve, is integrated in the return line downstream of the connection of the high-pressure pump. The spring-loaded valve integrated downstream of the connection of the high-pressure pump into the return line is able to replace a check valve arranged close to the internal combustion engine, whereby it proves to be significantly less susceptible to pressure pulsations in this arrangement. In addition, the temperature requirements are reduced to the valve, since the arrangement is further away from the engine and the valve can thus be designed for lower operating temperatures.

Bevorzugt ist die Rücklaufleitung an einen Triebwerksraum der Hochdruckpumpe angeschlossen. Der Anschluss erfolgt dabei vorzugsweise über wenigstens ein Wellenlager der Hochdruckpumpe. Durch die erforderliche Schmier- bzw. Kühlmenge der Hochdruckpumpe, welche über das wenigstens eine Wellenlager der Rücklaufleitung zugeführt wird, ist sichergestellt, dass der Druck in der Rücklaufleitung auf einem konstanten Niveau gehalten wird. Dies hat zur Folge, dass ferner die Dichtheitsanforderungen an das Ventil reduziert werden können. Preferably, the return line is connected to an engine room of the high-pressure pump. The connection is preferably carried out via at least one shaft bearing of the high-pressure pump. By the required lubricating or cooling amount of the high-pressure pump, which is supplied via the at least one shaft bearing of the return line, it is ensured that the pressure in the return line is maintained at a constant level. This has the consequence that further the tightness requirements can be reduced to the valve.

Vorteilhafterweise ist die Rücklaufleitung an einen Hochdruckspeicher zur Speicherung des auf Hochdruck geförderten Kraftstoffs und/oder an wenigstens ein mit dem Hochdruckspeicher verbundenes Kraftstoffeinspritzventil angeschlossen. Auf diese Weise können die Rücklaufmengen des oder der Kraftstoffeinspritzventile und der Hochdruckpumpe zusammengeführt werden. Das stromabwärts des Anschlusses der Hochdruckpumpe in die Rücklaufleitung integrierte federbelastete Ventil stellt dabei den erforderlichen Gegendruck über den gesamten Arbeitsbereich des oder der Kraftstoffeinspritzventile sicher und unterbindet dynamische Effekte im Gegenspiel von Kraftstoffeinspritzventil und Hochdruckpumpe. Advantageously, the return line is connected to a high-pressure accumulator for storing the fuel delivered at high pressure and / or to at least one fuel injection valve connected to the high-pressure accumulator. In this way, the return quantities of the one or more fuel injection valves and the high-pressure pump can be brought together. The spring-loaded valve integrated into the return line downstream of the connection of the high-pressure pump ensures the required backpressure over the entire operating range of the fuel injection valve or valves and prevents dynamic effects in the counterplay of the fuel injection valve and high-pressure pump.

Der Anschluss der Rücklaufleitung an die Hochdruckpumpe und/oder den Hochdruckspeicher und/oder wenigstens ein Kraftstoffeinspritzventil erfolgt bevorzugt über eine Abzweigleitung. Das federbelastete Ventil ist in diesem Fall bevorzugt in der Rücklaufleitung stromabwärts einer Abzweigleitung angeordnet, welche dem Anschluss der Rücklaufleitung an die Hochdruckpumpe dient. Unter "Leitung" wird vorliegend auch eine Bohrung in einem Gehäuseteil einer Komponente verstanden, so dass die Anschlussleitung – zumindest abschnittsweise – auch als Bohrung in einem Gehäuseteil der Hochdruckpumpe ausgeführt sein kann. Gleiches gilt entsprechend für den Anschluss des Hochdruckspeichers und/oder des wenigstens einen Kraftstoffeinspritzventils sowie hiermit zusammenwirkender Komponenten. The connection of the return line to the high-pressure pump and / or the high-pressure accumulator and / or at least one fuel injection valve preferably takes place via a branch line. The spring-loaded valve is in this case preferably arranged in the return line downstream of a branch line which serves to connect the return line to the high-pressure pump. In the present case, "lead" is also understood to mean a bore in a housing part of a component, so that the connecting lead-at least in sections-can also be designed as a bore in a housing part of the high-pressure pump. The same applies accordingly to the connection of the high-pressure accumulator and / or the at least one fuel injection valve and hereby cooperating components.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist zwischen der Hochdruckpumpe und der Vorförderpumpe ein Kraftstofffilter angeordnet. Über den Kraftstofffilter werden im Kraftstoff enthaltene schädliche Partikel entfernt. Darüber hinaus können weitere Filter vorgesehen sein. According to a preferred embodiment of the invention, a fuel filter is arranged between the high-pressure pump and the prefeed pump. The fuel filter removes harmful particles contained in the fuel. In addition, other filters may be provided.

Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen: A preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. These show:

1 eine schematische Darstellung eines bekannten Kraftstoffeinspritzsystems und 1 a schematic representation of a known fuel injection system and

2 eine schematische Darstellung eines erfindungsgemäßen Kraftstoffeinspritzsystems. 2 a schematic representation of a fuel injection system according to the invention.

Ausführliche Beschreibung der Zeichnungen Detailed description of the drawings

Das in der 1 dargestellte bekannte Kraftstoffeinspritzsystem umfasst einen Kraftstofftank 3 und eine Vorförderpumpe 2, welche Kraftstoff aus dem Kraftstofftank 3 ansaugt und über eine Zulaufleitung 4 einer Hochdruckpumpe 1 zuführt. Zwischen der Vorförderpumpe 2 und der Hochdruckpumpe 1 ist ein Kraftstofffilter 11 angeordnet. Die Hochdruckpumpe 1 fördert einen Teil des über die Vorförderpumpe 2 zugeführten Kraftstoffs auf Hochdruck und führt diesen einem Hochdruckspeicher 8 zu. Über an den Hochdruckspeicher 8 angeschlossene Kraftstoffeinspritzventile 9 wird der auf Hochdruck geförderte Kraftstoff in einen Brennraum einer Brennkraftmaschine (nicht dargestellt) eingespritzt. Sowohl die Kraftstoffeinspritzventile 9 als auch die Hochdruckpumpe 1 sind unmittelbar oder mittelbar über eine Abzweigleitung 10 an eine Rücklaufleitung 5 angeschlossen. Zur Einstellung eines bestimmten Rücklaufgegendrucks in der Rücklaufleitung 5 ist in der Nähe des Brennraums der Brennkraftmaschine ein federbelastetes Ventil 6' in Form eines Rückschlagventils angeordnet. Aufgrund der Nähe zum Brennraum bestehen an das Ventil 6' erhöhte Temperaturanforderungen. Zudem werden die eingesetzten Kraftstoffeinspritzventile 9 immer stärker in der Leckage reduziert, womit ferner die Dichtheitsanforderungen an das Ventil 6' steigen. That in the 1 shown known fuel injection system comprises a fuel tank 3 and a prefeed pump 2 which fuel from the fuel tank 3 sucks and via a supply line 4 a high pressure pump 1 supplies. Between the pre-feed pump 2 and the high pressure pump 1 is a fuel filter 11 arranged. The high pressure pump 1 promotes a part of the pre-feed pump 2 supplied fuel to high pressure and leads this a high-pressure accumulator 8th to. About to the high-pressure accumulator 8th connected fuel injection valves 9 the fuel delivered at high pressure is injected into a combustion chamber of an internal combustion engine (not shown). Both the fuel injectors 9 as well as the high pressure pump 1 are directly or indirectly via a branch line 10 to a return line 5 connected. For setting a specific return backpressure in the return line 5 is a spring-loaded valve near the combustion chamber of the internal combustion engine 6 ' arranged in the form of a check valve. Due to the proximity to the combustion chamber exist on the valve 6 ' increased temperature requirements. In addition, the fuel injection valves used 9 increasingly reduced in the leakage, which further the tightness requirements for the valve 6 ' climb.

Bei dem in der 2 dargestellten erfindungsgemäßen Kraftstoffeinspritzsystem ist anstelle eines brennraumnahen Rückschlagventils 6' ein federbelastetes Ventil 6 stromabwärts der Abzweigleitung 10 vorgesehen, welche die Hochdruckpumpe 1 mit der Rücklaufleitung 5 verbindet, um einen als Schmier- und Kühlmenge dienenden Teil des zugeführten Kraftstoffs aus dem Triebwerksraum 7 der Hochdruckpumpe 1 in den Kraftstofftank 3 zurückzuführen. Die Anordnung des Ventils 6 erfolgt entfernt von dem Brennraum der Brennkraftmaschine, so dass das Ventil 6 auf geringere Einsatztemperaturen hin ausgelegt werden kann. Ferner bestehen geringere Anforderungen an die Dichtheit des Ventils 6, da die aus dem Triebwerksraum 7 der Hochdruckpumpe 1 abgeführte Schmier- und Kühlmenge für ein konstantes Druckniveau sorgt. Durch die Integration des Ventils 6 in den Gesamtrücklauf von Hochdruckpumpe 1 und Kraftstoffeinspritzventilen 9 ist der erforderliche Rücklaufgegendruck über den gesamten Einsatzbereich der Kraftstoffeinspritzventile 9 sichergestellt. Damit ist das Ventil 6 zudem deutlich weniger störanfällig gegenüber Druckpulsationen. In the in the 2 illustrated fuel injection system according to the invention is instead of a combustion chamber close check valve 6 ' a spring-loaded valve 6 downstream of the branch line 10 provided which the high pressure pump 1 with the return line 5 connects to serving as a lubricating and cooling portion of the supplied fuel from the engine room 7 the high pressure pump 1 in the fuel tank 3 due. The arrangement of the valve 6 takes place away from the combustion chamber of the internal combustion engine, so that the valve 6 can be designed for lower operating temperatures. Furthermore, there are lower requirements for the tightness of the valve 6 since the engine room 7 the high pressure pump 1 discharged lubricating and cooling amount ensures a constant pressure level. By integrating the valve 6 in the total return of high pressure pump 1 and fuel injection valves 9 is the required return back pressure over the entire range of use of the fuel injectors 9 ensured. This is the valve 6 In addition, significantly less susceptible to interference with pressure pulsations.

Das erfindungsgemäße Kraftstoffeinspritzsystem vereinfacht nicht nur die Auslegung des Niederdruckkreises, sondern ermöglicht ferner eine Vereinheitlichung der Auslegung, da sie sich als kompatibel im Hinblick auf unterschiedliche Systeme erweist. Durch ein einfaches und kostengünstiges Bauteil in Form des federbelasteten Ventils 6 kann somit die Varianz beim Kunden reduziert werden. The fuel injection system according to the invention not only simplifies the design of the low-pressure circuit, but also enables a standardization of the design, since it proves to be compatible with respect to different systems. By a simple and inexpensive component in the form of the spring-loaded valve 6 Thus, the variance can be reduced at the customer.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 102010043923 A1 [0002] DE 102010043923 A1 [0002]

Claims (6)

Kraftstoffeinspritzsystem, insbesondere Common-Rail-Einspritzsystem, umfassend eine Hochdruckpumpe (1) und eine Vorförderpumpe (2), mittels welcher Kraftstoff aus einem Kraftstofftank (3) ansaugbar und zur Förderung auf Hochdruck über eine Zulaufleitung (4) der Hochdruckpumpe (1) zuführbar ist, wobei an die Hochdruckpumpe (1) eine Rücklaufleitung (5) zur Rückführung einer Leckage-, Schmier- und/oder Kühlmenge angeschlossen ist, dadurch gekennzeichnet, dass in die Rücklaufleitung (5) stromabwärts des Anschlusses der Hochdruckpumpe (1) ein federbelastetes Ventil (6), insbesondere ein Rückschlagventil oder ein Überströmventil, integriert ist. Fuel injection system, in particular common-rail injection system, comprising a high-pressure pump ( 1 ) and a prefeed pump ( 2 ), by means of which fuel from a fuel tank ( 3 ) and for conveying to high pressure via a supply line ( 4 ) of the high-pressure pump ( 1 ) can be supplied, wherein the high-pressure pump ( 1 ) a return line ( 5 ) is connected to the return of a leakage, lubricating and / or cooling amount, characterized in that in the return line ( 5 ) downstream of the connection of the high pressure pump ( 1 ) a spring-loaded valve ( 6 ), in particular a check valve or an overflow valve, is integrated. Kraftstoffeinspritzsystem nach Anspruch 1, dadurch gekennzeichnet, dass die Rücklaufleitung (5) an einen Triebwerksraum (7) der Hochdruckpumpe (1) angeschlossen ist, wobei der Anschluss vorzugsweise über wenigstens ein Wellenlager der Hochdruckpumpe (1) erfolgt. Fuel injection system according to claim 1, characterized in that the return line ( 5 ) to an engine room ( 7 ) of the high-pressure pump ( 1 ), wherein the connection preferably via at least one shaft bearing of the high-pressure pump ( 1 ) he follows. Kraftstoffeinspritzsystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Rücklaufleitung (5) an einen Hochdruckspeicher (8) zur Speicherung des auf Hochdruck geförderten Kraftstoffs und/oder an wenigstens ein mit dem Hochdruckspeicher (8) verbundenes Kraftstoffeinspritzventil (9) angeschlossen ist. Fuel injection system according to claim 1 or 2, characterized in that the return line ( 5 ) to a high-pressure accumulator ( 8th ) for storing the fuel delivered at high pressure and / or to at least one with the high-pressure accumulator ( 8th ) connected fuel injection valve ( 9 ) connected. Kraftstoffeinspritzsystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Anschluss an die Hochdruckpumpe (1) und/oder den Hochdruckspeicher (8) und/oder wenigstens ein Kraftstoffeinspritzventil (9) über eine Abzweigleitung (10) erfolgt. Fuel injection system according to one of the preceding claims, characterized in that the connection to the high pressure pump ( 1 ) and / or the high-pressure accumulator ( 8th ) and / or at least one fuel injection valve ( 9 ) via a branch line ( 10 ) he follows. Kraftstoffeinspritzsystem nach Anspruch 4, dadurch gekennzeichnet, dass das federbelastete Ventil (6) in der Rücklaufleitung (5) stromabwärts einer Abzweigleitung (10) angeordnet ist, welche dem Anschluss der Rücklaufleitung (5) an die Hochdruckpumpe (1) dient. Fuel injection system according to claim 4, characterized in that the spring-loaded valve ( 6 ) in the return line ( 5 ) downstream of a branch line ( 10 ) is arranged, which the connection of the return line ( 5 ) to the high pressure pump ( 1 ) serves. Kraftstoffeinspritzsystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen der Hochdruckpumpe (1) und der Vorförderpumpe (2) ein Kraftstofffilter (11) angeordnet ist. Fuel injection system according to one of the preceding claims, characterized in that between the high pressure pump ( 1 ) and the feed pump ( 2 ) a fuel filter ( 11 ) is arranged.
DE201210224408 2012-12-27 2012-12-27 Fuel injection system e.g. common-rail injection system of internal combustion engine, has return-flow pipe whose downstream is connected with high-pressure pump that is integrated with spring-loaded valve which is check valve Ceased DE102012224408A1 (en)

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CN110199110A (en) * 2017-03-23 2019-09-03 大陆汽车有限责任公司 Valve module and fuel injection system for fuel injection system

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Publication number Priority date Publication date Assignee Title
CN110199110A (en) * 2017-03-23 2019-09-03 大陆汽车有限责任公司 Valve module and fuel injection system for fuel injection system

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