WO2013079519A1 - Fuel delivery arrangement for a fuel injection system and fuel injection system - Google Patents

Fuel delivery arrangement for a fuel injection system and fuel injection system Download PDF

Info

Publication number
WO2013079519A1
WO2013079519A1 PCT/EP2012/073813 EP2012073813W WO2013079519A1 WO 2013079519 A1 WO2013079519 A1 WO 2013079519A1 EP 2012073813 W EP2012073813 W EP 2012073813W WO 2013079519 A1 WO2013079519 A1 WO 2013079519A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
valve
pump
injection system
shaft bearing
Prior art date
Application number
PCT/EP2012/073813
Other languages
German (de)
French (fr)
Inventor
Christian Langenbach
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2013079519A1 publication Critical patent/WO2013079519A1/en

Links

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
    • 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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • 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
    • 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

Definitions

  • the invention relates to a fuel delivery device for a fuel injection system, in particular a common rail injection system, with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injection system with such a fuel delivery device.
  • DE 10 2008 061 473 A1 discloses an injection system with at least one fuel pump, for example a pre-feed pump and / or a high-pressure pump.
  • the fuel pump is connected via at least one shaft bearing with a downstream purge line.
  • the arrangement of a throttle in the range of the fuel pump or the downstream-side purge line is proposed. This is to ensure that at different bearing clearance, for example due to manufacturing tolerances or aging of the shaft bearing, always enough fuel is available to supply the injection system with fuel.
  • the throttle may be upstream or downstream of the shaft bearing in the flow direction.
  • the throttle is formed as a thin plate or disc, in which a small bore is formed as Spülöl trimmann.
  • the plate or disc is installed transversely to the flow direction of the fuel so that a corresponding fuel pressure can build up before the bore.
  • the present invention seeks to provide a fuel delivery system for a fuel injection system, which ensures greater operational safety.
  • the object is achieved by a fuel delivery device with the features of claim 1.
  • Advantageous developments of the invention are specified in the subclaims.
  • a fuel injection system is claimed with such a fuel delivery device.
  • the proposed fuel delivery device comprises a prefeed pump, by means of which a quantity of fuel sucked from a fuel reservoir can be fed via a fuel line to an engine room of a high-pressure pump. Furthermore, the fuel delivery device comprises a return line.
  • a pump shaft In the engine room of the high pressure pump, a pump shaft is accommodated, which is rotatably supported via at least one shaft bearing.
  • the return line to the engine room of the high-pressure pump is hydraulically connected.
  • a valve is provided in the return line downstream of the at least one shaft bearing, by means of which depending on the respective pressure boundary conditions over the at least one shaft bearing flowing out of the engine room and the lubrication and / or cooling of the high-pressure pump serving amount of fuel is controllable.
  • the pressure boundary conditions are determined in particular by the inlet pressure prevailing in the engine room of the high-pressure pump and / or the return pressure prevailing in the return line.
  • the valve is therefore pressure-controlled in such a way that at standstill of the high pressure pump (no inlet pressure) assumes a switching position in which the flow is limited to a minimum, so that emptying of the engine room of the high-pressure pump is prevented or at least made more difficult.
  • the valve assumes a switching position in which the flow rate is increased in such a way that sufficient lubrication and / or cooling of the high-pressure pump is ensured.
  • Valve can therefore occupy at least two switch positions and control in this way the flow rate. This is compared to a concept that provides for the use of a restrictor to restrict flow, not only greater flexibility in terms of setting the lubricant and / or cooling quantities, but also greater reliability.
  • at least one control line is provided to control the valve, via which the valve with the pressure prevailing in the engine room and / or in the return line pressure can be acted upon.
  • the valve between two switching positions represents a variable flow resistance. In this way, not only a minimum and a maximum flow can be realized, but the flow rate can be variably controlled. This further increases the flexibility of the concept.
  • the valve is acted upon in the direction of a switching position by the spring force of a spring.
  • the spring force of the spring acts in the closing direction of the valve. This means that to open the valve, the spring force of the spring must be overcome.
  • the opening behavior of the valve is adjustable via the spring force of the spring.
  • the prefeed pump is designed as a controllable electric fuel pump. About the electric fuel pump, the inlet pressure is adjustable so that it can be raised, for example, to force an opening of the valve, which allows for high load additional heat dissipation.
  • the prefeed pump may also be a mechanical prefeed pump, for example a gear pump, or a non-controllable electrically driven prefeed pump.
  • the fuel injection system has a high
  • FIG. 1 shows a low-pressure circuit according to the invention in a schematic representation.
  • the schematic representation of the single figure is shown in a preferred embodiment of a fuel delivery device according to the invention.
  • This comprises a controllable electric fuel pump as a prefeed pump 2, by means of which an amount of fuel from a fuel tank 1 via a fuel line 3 an engine room 4 and a high pressure area (not shown) of a high-pressure pump 5 can be fed.
  • the engine compartment 4 serves to receive a pump shaft 6, which in the present case is designed as a camshaft and is rotatably mounted via at least one shaft bearing 7 formed in the housing (not shown) of the high-pressure pump 5.
  • About the shaft bearing 7 of the engine room 4 of the high pressure pump 5 is connected to a return line 8, which leads over the shaft bearing 7 effluent lubricant and / or cooling back into the fuel tank 1.
  • the shaft bearing 7 itself is due to the bearing gap hydraulically a throttle point and is marked accordingly with a throttle symbol.
  • the shaft bearing 7 is followed by a pressure-controlled valve 9, which can be acted upon by control lines 10, 11 on the one hand with the pressure prevailing in the engine compartment 4 and on the other hand with the pressure prevailing in the return line 8. Further, the valve 9 is acted upon by the spring force of a spring 12, wherein the spring force acts in the closing direction of the valve 9.
  • a variable flow resistance can be represented by the valve 9 or a movable valve element (not shown) of the valve 9 between two switching positions, which allow a minimum flow (closed position) and a maximum flow (open position) in such a way and is movable, that it is able to take intermediate positions.
  • the valve 9 is shown in the closed position, in which the valve 9 is held by the spring force of the spring 12. If the inlet pressure rises in Engine room 4 of the high pressure pump 5, so that the spring force of the spring 12 is overcome, opens the valve. 9
  • the high-pressure pump 5 has a further shaft bearing 7 (not shown), this is optionally connected to the shaft via a connecting line (not shown)

Landscapes

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

Abstract

The invention relates to a fuel delivery arrangement for a fuel injection system, more particularly a common rail injection system comprising a pre-supply pump (2), by means of which a fuel quantity suctioned from a fuel storage tank (1) can be supplied via a fuel line (3) to a driving mechanism chamber (4) of a high-pressure pump (5), wherein accommodated in the driving mechanism chamber (4) of the high-pressure pump (5) is a pump shaft (6), which is rotatably mounted via at least one shaft bearing (7), further comprising a return line (8), which is hydraulically connected to the driving mechanism chamber (4) of the high-pressure pump (5) via the at least one shaft bearing (7). According to the invention, a valve (9) is provided in the return line (8) downstream of the at least one shaft bearing (7), by means of which valve, a fuel quantity flowing via the at least one shaft bearing (7) out of the driving mechanism chamber (4) and serving to lubricate and/or cool the high-pressure pump (5) can be controlled on the basis of the pressure boundary conditions. The invention further relates to a fuel injection system having such a fuel delivery arrangement.

Description

Beschreibung  description
Titel title
Kraftstofffördereinrichtung für ein Kraftstoffeinspritzsystem sowie Kraftstoffein- spritzsystem  Fuel delivery device for a fuel injection system and fuel injection system
Die Erfindung betrifft eine Kraftstofffördereinrichtung für ein Kraftstoffeinspritzsystem, insbesondere ein Common-Rail-Einspritzsystem, mit den Merkmalen des Oberbegriffs des Anspruchs 1. Des Weiteren betrifft die Erfindung ein Kraftstoffeinspritzsystem mit einer solchen Kraftstofffördereinrichtung. The invention relates to a fuel delivery device for a fuel injection system, in particular a common rail injection system, with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injection system with such a fuel delivery device.
Stand der Technik State of the art
Aus der DE 10 2008 061 473 A1 geht ein Einspritzsystem mit wenigstens einer Kraftstoffpumpe, beispielsweise einer Vorförderpumpe und/oder einer Hochdruckpumpe hervor. Die Kraftstoffpumpe ist über wenigstens ein Wellenlager mit einer abgangseitigen Spülleitung verbunden. Um den Spülöldurchfluss durch das Wellenlager zu begrenzen, wird die Anordnung einer Drossel im Bereich der Kraftstoffpumpe oder der abgangseitigen Spülleitung vorgeschlagen. Dadurch soll sichergestellt werden, dass bei unterschiedlichem Lagerspiel, beispielsweise aufgrund von Fertigungstoleranzen oder Alterung des Wellenlagers, immer genügend Kraftstoff zur Verfügung steht, um das Einspritzsystem mit Kraftstoff zu versorgen. Die Drossel kann dem Wellenlager in Flussrichtung vor- oder nachgeschaltet sein. Bevorzugt ist die Drossel als dünne Platte oder Scheibe ausgebildet, in welcher eine kleine Bohrung als Spülöldurchfluss ausgebildet ist. Die Platte oder Scheibe wird quer zur Flussrichtung des Kraftstoffs eingebaut, so dass sich vor der Bohrung ein entsprechender Kraftstoffdruck aufbauen kann. DE 10 2008 061 473 A1 discloses an injection system with at least one fuel pump, for example a pre-feed pump and / or a high-pressure pump. The fuel pump is connected via at least one shaft bearing with a downstream purge line. In order to limit the Spülöldurchfluss through the shaft bearing, the arrangement of a throttle in the range of the fuel pump or the downstream-side purge line is proposed. This is to ensure that at different bearing clearance, for example due to manufacturing tolerances or aging of the shaft bearing, always enough fuel is available to supply the injection system with fuel. The throttle may be upstream or downstream of the shaft bearing in the flow direction. Preferably, the throttle is formed as a thin plate or disc, in which a small bore is formed as Spülöldurchfluss. The plate or disc is installed transversely to the flow direction of the fuel so that a corresponding fuel pressure can build up before the bore.
Ausgehend von dem vorstehend genannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Kraftstofffördereinrichtung für ein Kraftstoffeinspritzsystem anzugeben, welche eine größere Betriebsicherheit gewährleistet. Die Aufgabe wird gelöst durch eine Kraftstofffördereinrichtung mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. Darüber hinaus wird ein Kraftstoffeinspritzsystem mit einer solchen Kraftstofffördereinrichtung beansprucht. Based on the above-mentioned prior art, the present invention seeks to provide a fuel delivery system for a fuel injection system, which ensures greater operational safety. The object is achieved by a fuel delivery device with the features of claim 1. Advantageous developments of the invention are specified in the subclaims. In addition, a fuel injection system is claimed with such a fuel delivery device.
Offenbarung der Erfindung Disclosure of the invention
Die vorgeschlagene Kraftstofffördereinrichtung umfasst eine Vorförderpumpe, mittels welcher eine aus einem Kraftstoffvorratsbehälter angesaugte Kraftstoffmenge über eine Kraftstoffleitung einem Triebwerksraum einer Hochdruckpumpe zuführbar ist. Ferner umfasst die Kraftstofffördereinrichtung eine Rücklaufleitung. Im Triebwerksraum der Hochdruckpumpe ist eine Pumpenwelle aufgenommen, die über wenigstens ein Wellenlager drehbar gelagert ist. Über das wenigstens eine Wellenlager ist die Rücklaufleitung mit dem Triebwerksraum der Hochdruckpumpe hydraulisch verbunden. Erfindungsgemäß ist in der Rücklaufleitung stromabwärts des wenigstens einen Wellenlagers ein Ventil vorgesehen, mittels dessen in Abhängigkeit von den jeweiligen Druckrandbedingungen eine über das wenigstens eine Wellenlager aus dem Triebwerksraum abströmende und der Schmierung und/oder Kühlung der Hochdruckpumpe dienende Kraftstoffmenge steuerbar ist. Die Druckrandbedingungen werden vorliegend insbesondere durch den im Triebwerksraum der Hochdruckpumpe herrschenden Zulaufdruck und/oder den in der Rücklaufleitung herrschenden Rücklaufdruck bestimmt. Das Ventil ist demnach druckgesteuert und zwar in der Weise, dass es bei Stillstand der Hochdruckpumpe (kein Zulaufdruck) eine Schaltstellung einnimmt, in welcher der Durchfluss auf ein Minimum begrenzt wird, so dass ein Leerlaufen des Triebwerkraums der Hochdruckpumpe verhindert oder zumindest erschwert wird. Im Normalbetrieb der Hochdruckpumpe nimmt das Ventil dagegen eine Schaltstellung ein, in welcher der Durchfluss derart erhöht wird, dass eine ausreichen- de Schmierung und/oder Kühlung der Hochdruckpumpe sichergestellt ist. DasThe proposed fuel delivery device comprises a prefeed pump, by means of which a quantity of fuel sucked from a fuel reservoir can be fed via a fuel line to an engine room of a high-pressure pump. Furthermore, the fuel delivery device comprises a return line. In the engine room of the high pressure pump, a pump shaft is accommodated, which is rotatably supported via at least one shaft bearing. About the at least one shaft bearing, the return line to the engine room of the high-pressure pump is hydraulically connected. According to the invention, a valve is provided in the return line downstream of the at least one shaft bearing, by means of which depending on the respective pressure boundary conditions over the at least one shaft bearing flowing out of the engine room and the lubrication and / or cooling of the high-pressure pump serving amount of fuel is controllable. In the present case, the pressure boundary conditions are determined in particular by the inlet pressure prevailing in the engine room of the high-pressure pump and / or the return pressure prevailing in the return line. The valve is therefore pressure-controlled in such a way that at standstill of the high pressure pump (no inlet pressure) assumes a switching position in which the flow is limited to a minimum, so that emptying of the engine room of the high-pressure pump is prevented or at least made more difficult. In normal operation of the high-pressure pump, however, the valve assumes a switching position in which the flow rate is increased in such a way that sufficient lubrication and / or cooling of the high-pressure pump is ensured. The
Ventil kann demzufolge wenigstens zwei Schaltstellungen einnehmen und auf diese Weise die Durchflussmenge steuern. Damit ist gegenüber einem Konzept, das den Einsatz einer Drossel zur Durchflussbegrenzung vorsieht, nicht nur eine größere Flexibilität im Hinblick auf die Einstellung der Schmier- und/oder Kühl- mengen, sondern auch eine größere Betriebssicherheit gegeben. Bevorzugt ist zur Steuerung des Ventils wenigstens eine Steuerleitung vorgesehen, über welche das Ventil mit dem im Triebwerksraum und/oder in der Rücklaufleitung herrschenden Druck beaufschlagbar ist. Weiterhin bevorzugt ist eine erste Steuerleitung mit dem Triebwerksraum und eine zweite Steuerleitung mit der Rücklaufleitung verbunden, so dass die Steuerung des Ventils über dieValve can therefore occupy at least two switch positions and control in this way the flow rate. This is compared to a concept that provides for the use of a restrictor to restrict flow, not only greater flexibility in terms of setting the lubricant and / or cooling quantities, but also greater reliability. Preferably, at least one control line is provided to control the valve, via which the valve with the pressure prevailing in the engine room and / or in the return line pressure can be acted upon. Further preferably, a first control line to the engine room and a second control line connected to the return line, so that the control of the valve over the
Druckdifferenz zwischen dem im Triebwerksraum und dem in der Rücklaufleitung herrschenden Druck erfolgt. Bei einer großen Druckdifferenz, welche beispielsweise auf ein enges Lagerspiel des Wellenlagers zurückzuführen ist, öffnet das Ventil, um den Durchfluss zu erhöhen. Bei einer kleinen Druckdifferenz, welche wiederum auf ein entsprechend großes Lagerspiel zurückgeführt werden kann, schließt das Ventil, um den Durchfluss zu begrenzen. Pressure difference between the pressure prevailing in the engine room and the pressure prevailing in the return line. At a large pressure difference, which is due for example to a tight bearing clearance of the shaft bearing, the valve opens to increase the flow. At a small pressure difference, which in turn can be attributed to a correspondingly large bearing clearance, the valve closes to limit the flow.
Gemäß einer Weiterbildung der Erfindung wird vorgeschlagen, dass das Ventil zwischen zwei Schaltstellungen einen variablen Durchflusswiderstand darstellt. Auf diese Weise ist nicht nur ein minimaler und ein maximaler Durchfluss realisierbar, sondern die Durchflussmenge variabel steuerbar. Dadurch wird die Flexibilität des Konzepts weiter erhöht. According to one embodiment of the invention, it is proposed that the valve between two switching positions represents a variable flow resistance. In this way, not only a minimum and a maximum flow can be realized, but the flow rate can be variably controlled. This further increases the flexibility of the concept.
Des Weiteren wird vorgeschlagen, dass das Ventil in Richtung einer Schaltstel- lung von der Federkraft einer Feder beaufschlagt ist. Vorzugsweise wirkt die Federkraft der Feder in Schließrichtung des Ventils. Das heißt, dass zum Öffnen des Ventils die Federkraft der Feder überwunden werden muss. Über die Federkraft der Feder ist demnach das Öffnungsverhalten des Ventils einstellbar. Vorteilhafterweise ist die Vorförderpumpe als regelbare Elektrokraftstoffpumpe ausgelegt. Über die Elektrokraftstoffpumpe ist der Zulaufdruck regelbar, so dass dieser angehoben werden kann, um beispielsweise ein Öffnen des Ventils zu erzwingen, was bei großer Belastung eine zusätzliche Wärmeabfuhr ermöglicht. Alternativ kann die Vorförderpumpe aber auch eine mechanische Vorförderpumpe, beispielsweise eine Zahnradpumpe, oder eine nicht regelbare elektrisch angetriebene Vorförderpumpe sein. Furthermore, it is proposed that the valve is acted upon in the direction of a switching position by the spring force of a spring. Preferably, the spring force of the spring acts in the closing direction of the valve. This means that to open the valve, the spring force of the spring must be overcome. Accordingly, the opening behavior of the valve is adjustable via the spring force of the spring. Advantageously, the prefeed pump is designed as a controllable electric fuel pump. About the electric fuel pump, the inlet pressure is adjustable so that it can be raised, for example, to force an opening of the valve, which allows for high load additional heat dissipation. Alternatively, however, the prefeed pump may also be a mechanical prefeed pump, for example a gear pump, or a non-controllable electrically driven prefeed pump.
Des Weiteren wird ein Kraftstoffeinspritzsystem zur Einspritzung von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einem erfindungsgemäßen Nie- derdruckkreislauf vorgeschlagen. Das Kraftstoffeinspritzsystem weist eine hoheFurthermore, a fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine with a low-pressure circuit according to the invention is proposed. The fuel injection system has a high
Betriebssicherheit auf, da der Niederdruckkreislauf eine optimale Schmierung und/oder Kühlung der Hochdruckpumpe in allen Betriebszuständen gewährleistet. Operational safety, since the low-pressure circuit optimal lubrication and / or cooling the high-pressure pump in all operating conditions guaranteed.
Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnung näher erläutert. Die Zeichnung zeigt einen erfindungsgemäßen Niederdruckkreislauf in einer schematischen Darstellung. A preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. The drawing shows a low-pressure circuit according to the invention in a schematic representation.
Ausführliche Beschreibung der Zeichnung Detailed description of the drawing
Der schematischen Darstellung der einzigen Figur ist eine bevorzugte Ausführungsform einer erfindungsgemäßen Kraftstofffördereinrichtung zu entnehmen. Diese umfasst eine regelbare Elektrokraftstoffpumpe als Vorförderpumpe 2, mittels welcher eine Kraftstoffmenge aus einem Kraftstoffvorratsbehälter 1 über eine Kraftstoffleitung 3 einem Triebwerksraum 4 und einem Hochdruckbereich (nicht dargestellt) einer Hochdruckpumpe 5 zuführbar ist. Der Triebwerksraum 4 dient der Aufnahme einer Pumpenwelle 6, welche vorliegend als Nockenwelle ausgebildet ist und über wenigstens ein im Gehäuse (nicht dargestellt) der Hochdruckpumpe 5 ausgebildetes Wellenlager 7 drehbar gelagert ist. Über das Wellenlager 7 ist der Triebwerksraum 4 der Hochdruckpumpe 5 mit einer Rücklaufleitung 8 verbunden, welche eine über das Wellenlager 7 abströmende Schmierund/oder Kühlmenge zurück in den Kraftstoffvorratsbehälter 1 führt. Das Wellenlager 7 selbst stellt aufgrund des Lagerspaltes hydraulisch eine Drosselstelle dar und ist dementsprechend mit einem Drosselsymbol gekennzeichnet. Zur Steuerung der Schmier- und/oder Kühlmenge ist dem Wellenlager 7 ein druckgesteuertes Ventil 9 nachgeschaltet, das über Steuerleitungen 10, 1 1 einerseits mit dem im Triebwerksraum 4 und andererseits mit dem in der Rücklaufleitung 8 herrschenden Druck beaufschlagbar ist. Ferner wir das Ventil 9 von der Federkraft einer Feder 12 beaufschlagt, wobei die Federkraft in Schließrichtung des Ventils 9 wirkt. Über das Ventil 9 ist ein variabler Durchflusswiderstand darstellbar, indem das Ventil 9 bzw. ein bewegliches Ventilelement (nicht dargestellt) des Ventils 9 zwischen zwei Schaltstellungen, welche einen minimalen Durchfluss (Schließstellung) und einen maximalen Durchfluss (Offenstellung) ermöglichen, in der Weise hin und her bewegbar ist, dass es Zwischenstellungen einzunehmen vermag. In der Figur ist das Ventil 9 in Schließstellung gezeigt, in der das Ventil 9 von der Federkraft der Feder 12 gehalten wird. Steigt der Zulaufdruck im Triebwerksraum 4 der Hochdruckpumpe 5 an, so dass die Federkraft der Feder 12 überwunden wird, öffnet das Ventil 9. The schematic representation of the single figure is shown in a preferred embodiment of a fuel delivery device according to the invention. This comprises a controllable electric fuel pump as a prefeed pump 2, by means of which an amount of fuel from a fuel tank 1 via a fuel line 3 an engine room 4 and a high pressure area (not shown) of a high-pressure pump 5 can be fed. The engine compartment 4 serves to receive a pump shaft 6, which in the present case is designed as a camshaft and is rotatably mounted via at least one shaft bearing 7 formed in the housing (not shown) of the high-pressure pump 5. About the shaft bearing 7 of the engine room 4 of the high pressure pump 5 is connected to a return line 8, which leads over the shaft bearing 7 effluent lubricant and / or cooling back into the fuel tank 1. The shaft bearing 7 itself is due to the bearing gap hydraulically a throttle point and is marked accordingly with a throttle symbol. To control the amount of lubricant and / or cooling, the shaft bearing 7 is followed by a pressure-controlled valve 9, which can be acted upon by control lines 10, 11 on the one hand with the pressure prevailing in the engine compartment 4 and on the other hand with the pressure prevailing in the return line 8. Further, the valve 9 is acted upon by the spring force of a spring 12, wherein the spring force acts in the closing direction of the valve 9. Via the valve 9, a variable flow resistance can be represented by the valve 9 or a movable valve element (not shown) of the valve 9 between two switching positions, which allow a minimum flow (closed position) and a maximum flow (open position) in such a way and is movable, that it is able to take intermediate positions. In the figure, the valve 9 is shown in the closed position, in which the valve 9 is held by the spring force of the spring 12. If the inlet pressure rises in Engine room 4 of the high pressure pump 5, so that the spring force of the spring 12 is overcome, opens the valve. 9
Weist die Hochdruckpumpe 5 ein weiteres Wellenlager 7 auf (nicht dargestellt), ist dieses wahlweise über eine Verbindungsleitung (nicht dargestellt) an dieIf the high-pressure pump 5 has a further shaft bearing 7 (not shown), this is optionally connected to the shaft via a connecting line (not shown)
Rücklaufleitung 8 angebunden, welche stromaufwärts des Ventils 9 in die Rücklaufleitung 8 mündet. Auf diese Weise kann die Lagerdurchflussmenge beider Wellenlager 7 über ein Ventil 9 gesteuert werden. Return line 8 connected, which opens upstream of the valve 9 in the return line 8. In this way, the bearing flow rate of both shaft bearings 7 can be controlled via a valve 9.

Claims

Kraftstofffördereinrichtung für ein Kraftstoffeinspritzsystem, insbesondere ein Common-Rail-Einspritzsystem, umfassend eine Vorförderpumpe (2), mittels welcher eine aus einem Kraftstoffvorratsbehälter (1) angesaugte Kraftstoffmenge über eine Kraftstoffleitung (3) einem Triebwerksraum (4) einer Hochdruckpumpe (5) zuführbar ist, wobei im Triebwerksraum (4) der Hochdruckpumpe (5) eine Pumpenwelle (6) aufgenommen ist, die über wenigstens ein Wellenlager (7) drehbar gelagert ist, ferner umfassend eine Rücklaufleitung (8), welche über das wenigstens eine Wellenlager (7) mit dem Triebwerksraum (4) der Hochdruckpumpe (5) hydraulisch verbunden ist, Fuel delivery device for a fuel injection system, in particular a common rail injection system, comprising a prefeed pump (2), by means of which a fuel from a fuel tank (1) sucked amount of fuel via a fuel line (3) an engine compartment (4) of a high-pressure pump (5) can be fed wherein in the engine room (4) of the high-pressure pump (5) a pump shaft (6) is received, which is rotatably mounted on at least one shaft bearing (7), further comprising a return line (8), which via the at least one shaft bearing (7) with the Engine room (4) of the high pressure pump (5) is hydraulically connected,
dadurch gekennzeichnet, dass in der Rücklaufleitung (8) stromabwärts des wenigstens einen Wellenlagers (7) ein Ventil (9) vorgesehen ist, mittels dessen in Abhängigkeit von den jeweiligen Druckrandbedingungen eine über das wenigstens eine Wellenlager (7) aus dem Triebwerksraum (4) abströmende und der Schmierung und/oder Kühlung der Hochdruckpumpe (5) dienende Kraftstoffmenge steuerbar ist. characterized in that in the return line (8) downstream of the at least one shaft bearing (7), a valve (9) is provided, by means of which depending on the respective pressure boundary conditions via the at least one shaft bearing (7) from the engine room (4) and the amount of fuel serving to lubricate and / or cool the high pressure pump (5) is controllable.
Kraftstofffördereinrichtung nach Anspruch 1 , Fuel delivery device according to claim 1,
dadurch gekennzeichnet, dass zur Steuerung des Ventils (9) wenigstens eine Steuerleitung (10, 1 1 ) vorgesehen ist, über welche das Ventil (9) mit dem im Triebwerksraum (4) und/oder in der Rücklaufleitung (6) herrschenden Druck beaufschlagbar ist. characterized in that for controlling the valve (9) at least one control line (10, 1 1) is provided, via which the valve (9) in the engine room (4) and / or in the return line (6) prevailing pressure can be acted upon ,
Kraftstofffördereinrichtung nach Anspruch 1 oder 2, Fuel delivery device according to claim 1 or 2,
dadurch gekennzeichnet, dass das Ventil (9) zwischen zwei Schaltstellungen einen variablen Durchflusswiderstand darstellt. characterized in that the valve (9) represents a variable flow resistance between two switching positions.
Kraftstofffördereinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Ventil (9) in Richtung einer Schaltstellung von der Federkraft einer Feder (12) beaufschlagt ist. Kraftstofffördereinrichtung nach Anspruch 4, Fuel delivery device according to one of the preceding claims, characterized in that the valve (9) is acted upon in the direction of a switching position by the spring force of a spring (12). Fuel delivery device according to claim 4,
dadurch gekennzeichnet, dass die Federkraft der Feder (12) in Schließrichtung des Ventils (8) wirkt. characterized in that the spring force of the spring (12) acts in the closing direction of the valve (8).
Kraftstofffördereinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Vorförderpumpe (2) als regelbare Elek- trokraftstoffpumpe ausgelegt ist. Fuel delivery device according to one of the preceding claims, characterized in that the prefeed pump (2) is designed as a controllable electric fuel pump.
Kraftstoffeinspritzsystem zur Einspritzung von Kraftstoff in den Brennraum einer Brennkraftmaschine mit einer Kraftstofffördereinrichtung nach einem der vorhergehenden Ansprüche. Fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine with a fuel delivery device according to one of the preceding claims.
PCT/EP2012/073813 2011-11-29 2012-11-28 Fuel delivery arrangement for a fuel injection system and fuel injection system WO2013079519A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011087266.3 2011-11-29
DE201110087266 DE102011087266A1 (en) 2011-11-29 2011-11-29 Fuel delivery device for a fuel injection system and fuel injection system

Publications (1)

Publication Number Publication Date
WO2013079519A1 true WO2013079519A1 (en) 2013-06-06

Family

ID=47263356

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/073813 WO2013079519A1 (en) 2011-11-29 2012-11-28 Fuel delivery arrangement for a fuel injection system and fuel injection system

Country Status (2)

Country Link
DE (1) DE102011087266A1 (en)
WO (1) WO2013079519A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2310458A (en) * 1995-11-09 1997-08-27 Bosch Gmbh Robert Leakage fault recognition in the fuel supply of an i.c. engine with high-pressure fuel injection
EP1088984A2 (en) * 1999-09-30 2001-04-04 Siemens Aktiengesellschaft Fuel injection system for an internal combustion engine
US20030101970A1 (en) * 2001-12-04 2003-06-05 Yasutaka Utsumi Fuel injection pump having feed pump assembly
EP1457667A1 (en) * 2003-03-11 2004-09-15 Denso Corporation Fuel supply pump which is lubricated by the fuel
DE102008061473A1 (en) 2008-12-10 2010-06-24 Continental Automotive Gmbh Throttle i.e. thin plate, for electrically operated high-pressure fuel pump of common rail injection system for motor vehicle, has borehole for limiting fuel flow, where throttle is arranged before and/or after shaft bearing
DE102009037407A1 (en) * 2009-08-13 2011-04-21 Continental Automotive Gmbh High-pressure pump for conveying fuel into injector of injection system utilized for injecting fuel into diesel internal-combustion engine of motor vehicle, has flow control valve arranged in flushing pipe that flushes recess and bearing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2310458A (en) * 1995-11-09 1997-08-27 Bosch Gmbh Robert Leakage fault recognition in the fuel supply of an i.c. engine with high-pressure fuel injection
EP1088984A2 (en) * 1999-09-30 2001-04-04 Siemens Aktiengesellschaft Fuel injection system for an internal combustion engine
US20030101970A1 (en) * 2001-12-04 2003-06-05 Yasutaka Utsumi Fuel injection pump having feed pump assembly
EP1457667A1 (en) * 2003-03-11 2004-09-15 Denso Corporation Fuel supply pump which is lubricated by the fuel
DE102008061473A1 (en) 2008-12-10 2010-06-24 Continental Automotive Gmbh Throttle i.e. thin plate, for electrically operated high-pressure fuel pump of common rail injection system for motor vehicle, has borehole for limiting fuel flow, where throttle is arranged before and/or after shaft bearing
DE102009037407A1 (en) * 2009-08-13 2011-04-21 Continental Automotive Gmbh High-pressure pump for conveying fuel into injector of injection system utilized for injecting fuel into diesel internal-combustion engine of motor vehicle, has flow control valve arranged in flushing pipe that flushes recess and bearing

Also Published As

Publication number Publication date
DE102011087266A1 (en) 2013-05-29

Similar Documents

Publication Publication Date Title
EP2032832B1 (en) Fuel injection device for an internal combustion engine
EP2635791B1 (en) Fuel injection system of an internal combustion engine
EP2467591B1 (en) Fuel delivery device for a fuel injection device of an internal combustion engine
WO2012089561A1 (en) Fuel injection system of an internal combustion engine, and associated pressure regulating method
DE10057244A1 (en) Fuel injection system for internal combustion engines with improved starting behavior
DE102007039589A1 (en) Regular oil pump with adjustment-dependent oil pressure control
EP1911964B1 (en) High-pressure fuel pump and fuel injection system for a combustion engine
DE10218024A1 (en) Fuel injection device for an internal combustion engine
WO2011131448A1 (en) Pump assembly
DE102004008478B4 (en) Flow control of a high pressure pump
WO2013037538A1 (en) Low-pressure circuit for a fuel-injection system and fuel-injection system
WO2013037481A1 (en) High-pressure pump system
DE102008061473B4 (en) Fuel injection system
WO2007107411A2 (en) High-pressure fuel pump and fuel injection system for an internal combustion engine
EP2659125B1 (en) Pressure regulating arrangement of a fuel injection system having a valve at the pressurized side of the pump
DE102012203724A1 (en) Fuel conveying device for common-rail injection system in combustion engine, has flow path arranged in valve for hydraulic connection of shaft bearing of high pressure pump with return-flow pipe, where throttle is integrated into flow path
DE102005059160A1 (en) Fuel system for an internal combustion engine
WO2013079519A1 (en) Fuel delivery arrangement for a fuel injection system and fuel injection system
DE102009058784A1 (en) High-pressure pump for use in fuel-injection system of internal-combustion engine of motor vehicle, has damping element arranged at upstream of pressure chamber inlet valve, where damping element is designed as line with wall section
DE102009029159A1 (en) fluid injection system
DE102011089623A1 (en) Fuel conveying device for use in common-rail injection system for combustion engine, has return-flow pipe for returning lubricant-, coolant- and/or leakage amount into container or inlet line, and valves arranged in inlet line and/or pipe
DE102009024698A1 (en) Characteristic-map-controlled lubricant pump system, has pressure chambers arranged in lubricant pump and used for moving actuating unit toward spring, where one of pressure chambers has smaller dimension than that of other pressure chamber
DE10261414B4 (en) Fuel injection system
DE102007002729B3 (en) Fuel pump for high pressure fuel injection system i.e. common rail injection system, has valve arranged in housing at highest position with smallest opening pressure and other valves arranged at lowest position with largest opening pressure
DE102009047488A1 (en) Fuel injection device for internal combustion engine, has low pressure area and high pressure area, where supply pump is provided in low pressure area, where fuel is supplied from fuel tank to high pressure pump through supply pump

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12794316

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 12794316

Country of ref document: EP

Kind code of ref document: A1