EP2013471B1 - High-pressure fuel delivery device - Google Patents

High-pressure fuel delivery device Download PDF

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Publication number
EP2013471B1
EP2013471B1 EP07726366A EP07726366A EP2013471B1 EP 2013471 B1 EP2013471 B1 EP 2013471B1 EP 07726366 A EP07726366 A EP 07726366A EP 07726366 A EP07726366 A EP 07726366A EP 2013471 B1 EP2013471 B1 EP 2013471B1
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EP
European Patent Office
Prior art keywords
pressure
flow path
delivery device
fuel delivery
pump
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Not-in-force
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EP07726366A
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German (de)
French (fr)
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EP2013471A1 (en
Inventor
Sascha Ambrock
Andreas Dutt
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2013471A1 publication Critical patent/EP2013471A1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • 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
    • F02M63/0275—Arrangement of common rails
    • F02M63/028—Returnless common rail system
    • 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 high-pressure fuel delivery device according to the preamble of claim 1.
  • Such a fuel high-pressure conveyor for an internal combustion engine is characterized by the WO 02/40857 A known.
  • This high-pressure fuel delivery device has a high-pressure pump and a low-pressure flow path that leads from a fuel inlet of the high-pressure fuel delivery device to a receiving space for a drive shaft of the high-pressure pump and to at least one inlet valve of the high-pressure pump.
  • a return flow path is provided, is returned via the leakage and / or lubricating fuel.
  • the return flow path leads out of the high pressure pump and flows into a return line to a tank and thus into a low pressure flow path. At least one further connection for the return flow path is thus required in addition to the fuel inlet at the high-pressure fuel delivery device, which leads to a complicated construction of the high-pressure fuel delivery device.
  • a high-pressure fuel conveyor in the form of a high-pressure pump is known, in which the high-pressure pump is shown only symbolically.
  • the high pressure pump does not have a return flow path for leakage and / or lubricating fuel. How a required lubrication of the high pressure pump is not specified here. From a connection between the high-pressure pump and a fuel reservoir performs a return flow path, which opens into a low-pressure flow path to the high-pressure pump. Both the return flow path and the low-pressure flow path are arranged outside the high-pressure pump.
  • the present invention has the object, a high-pressure fuel conveyor of the to provide the aforementioned type, which allows a cheaper construction of the fuel system.
  • the return flow path does not leave the high-pressure fuel delivery device, but is integrated into it.
  • the fuel passing through, for example, the shaft bearings and / or shaft seals of the drive shaft is not returned to the tank but remains within the high pressure fuel delivery by being introduced into the low pressure flow path. In this way, an undesirable heating of the fuel stored in the fuel tank is avoided.
  • An advantageous embodiment of the fuel high-pressure conveyor according to the invention is characterized in that it comprises an integrated prefeed pump. This creates a particularly compact and powerful high-pressure fuel delivery device.
  • the prefeed pump is arranged in the low-pressure flow path, and that the return flow path upstream of the prefeed pump in the low pressure flow path opens.
  • a fuel system with such designed high-pressure fuel delivery device is particularly simple and compact.
  • a mechanical pressure control valve may be provided with a return channel, which opens into the low-pressure flow path upstream of the prefeed pump.
  • a return channel which opens into the low-pressure flow path upstream of the prefeed pump.
  • the high-pressure fuel delivery device can be connected to an external feed pump.
  • an external feed pump Such may, for example, be provided in the region of the tank of the fuel system to which the high-pressure fuel delivery device belongs. In this way it is avoided that a fuel line with comparatively low pressure is present between the high-pressure fuel conveyor and the tank, in which, for example, vapor bubbles can form.
  • a particularly advantageous development of the high-pressure fuel delivery device is characterized in that a suction jet pump is arranged in the low-pressure flow path, which is driven by the fuel flowing to the inlet valve and into which the return flow path opens.
  • the passing through the shaft bearings for example, amount of fuel is sucked in this way by the suction jet pump.
  • the sum of the amount of fuel flowing directly from the receiving space to the intake valve and the amount of flow recirculated via the return flow path is then available as a high-pressure delivery quantity.
  • Such a high-pressure fuel delivery device has a good efficiency, and moreover, the lubrication of the bearings is improved by the forced extraction of the lubricating fuel.
  • an external prefeed pump is provided, with which the fuel high-pressure conveyor is connectable, the return of the lubricating fuel is ensured even at low speeds of the high pressure pump by such a suction jet pump.
  • the adjustment of the prefeed pressure that is, the pressure with which the fuel through the receiving space to the intake valve is promoted, be particularly well adjusted.
  • a particularly compact high-pressure fuel delivery device can be created.
  • an adjustable throttle device may be disposed downstream of the mouth of the return flow path.
  • metering unit allows adjustment of the delivery of the high-pressure pump and thus the high-pressure fuel conveyor.
  • At least one flow restrictor may be arranged in the return flow path.
  • a fuel system carries the overall reference numeral 10. It belongs to an internal combustion engine, not shown, which in turn drives a motor vehicle, not shown.
  • the fuel system 10 includes a fuel tank 12 in which a liquid fuel, such as gasoline or diesel, is stored. From the fuel tank 12, a fuel line 14 via a filter 16 to a high-pressure fuel conveyor 18. In this, the fuel is compressed to a high pressure and conveyed to a fuel pressure accumulator 20, which is also referred to as "rail". To the rail 20 a plurality of fuel injectors 22 are connected, which inject the fuel directly into them associated combustion chambers (not shown) of the internal combustion engine. To the rail 20, a controllable pressure relief valve 24 is connected, from which a drain line 26 leads back to the fuel tank 12.
  • a liquid fuel such as gasoline or diesel
  • the high-pressure fuel delivery device 18 includes a fuel inlet 28 to which the fuel line 14 is connected. From the fuel inlet 28, a channel 30 leads to a prefeed pump 32, which is integrated into the high-pressure fuel delivery device 18. From the prefeed pump 32, a channel 34 leads to a high-pressure pump 36.
  • the high-pressure pump 36 as well as the prefeed pump 32 is mechanically driven by the internal combustion engine, for example by a camshaft of the internal combustion engine.
  • the high pressure pump 36 comprises a housing 38 having a receiving space 40 for a provided with a cam 42 drive shaft 44. This works with two pistons 46 a and 46 b together, the delivery spaces 48 a and 48 b limit.
  • a channel 50 leads to an adjustable throttling device 52, from which in turn pass channels 54a and 54b via intake valves 56a and 56b to the delivery chambers 48a and 48b.
  • Channels 58a and 58b connect delivery chambers 48a and 48b to exhaust valves 60a and 60b. These simultaneously form a fuel outlet of the high-pressure fuel delivery device, to which the rail 20 is connected.
  • the drive shaft 44 is mounted in the housing 38 of the high-pressure pump 36 by shaft bearings.
  • the receiving space 40 is sealed to the outside via corresponding shaft seals.
  • These are not absolutely tight and therefore in FIG. 1 by channels 62a and 62b and corresponding throttles 64a and 64b.
  • the throttle or shaft seal 64a is arranged in a housing cover, the throttle or shaft seal 64b in a housing body. About limiting throttles 65a and 65b lead the channels 62a and 62b back to the channel 30.
  • the mouth is designated 66.
  • an overflow channel 68 branches off, in which a mechanical pressure control or overflow valve 70 is arranged.
  • the overflow channel 68 opens into the channel 62 a and thus ultimately into the channel 30 at 66.
  • the fuel is sucked in by the prefeed pump 32 from the fuel tank 12 and compressed to a comparatively low prefeed pressure, for example 4 bar, and conveyed into the receiving space 40 at this pressure. There it serves to cool and lubricate the bearings of the drive shaft 44. From the receiving space 40, the fuel flows via the adjustable throttle 52 to the intake valves 56a, b and on into the delivery chambers 48a, b, where it is compressed and via the outlet valves 60a, b for Rail 20 is promoted.
  • a comparatively low prefeed pressure for example 4 bar
  • the fuel which passes through for the lubrication of the bearings of the drive shaft 44 and via the shaft seals 64a, b is conveyed via the return flow path 62a, b to the suction side (channel 30) of the prefeed pump 32 and sucked back therefrom.
  • FIG. 2 A fuel system 10 with an alternative embodiment of a high pressure fuel delivery device 18 is shown in FIG FIG. 2 shown. It is true that such elements and areas that have equivalent functions to previously described elements and areas, the same reference numerals and are not explained in detail again.
  • the prefeed pump 32 is not integrated into the high-pressure fuel conveyor 18, but arranged as an external prefeed pump 32 in the region of the fuel tank 12. It is also not powered by the internal combustion engine, but electrically.
  • the pressure control valve 70 with the overflow channel 68 is arranged in the region of the prefeed pump 32 close to the fuel tank 12.
  • an ejector 74 is arranged in the channel 50, which leads from the receiving space 40 via the adjustable throttle 52 to the channels 54a, b and on to the inlet valves 56a, b. This is thus driven by the fuel flowing from the receiving space 40 to the inlet valves 56a, b, and in 66 opens the return flow path 62a, b.

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

Abstract

A high-pressure fuel delivery device (18) for an internal combustion engine comprises a high-pressure pump (36) and a low-pressure flow path (72). Said low-pressure flow path (72) leads from a fuel inlet (28) of the high-pressure fuel delivery device (18) to a holding space (40) for a driveshaft (44) of the high-pressure pump (36) and onward to at least one inlet valve (56) of the high-pressure pump (36). Leakage and/or lubricating fuel is recirculated via a recirculation flow path (62). It is proposed that the recirculation flow path (62) opens out (66) into the low-pressure flow path (72).

Description

Die Erfindung betrifft eine Kraftstoff-Hochdruck-Fördereinrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a high-pressure fuel delivery device according to the preamble of claim 1.

Eine solche Kraftstoff-Hochdruck-Fördereinrichtung für eine Brennkraftmaschine ist durch die WO 02/40857 A bekannt. Diese Kraftstoff-Hochdruck-Fördereinrichtung weist eine Hochdruckpumpe und einen Niederdruck-Strömungsweg auf, der von einem Kraftstoffeinlass der Kraftstoff-Hochdruck-Fördereinrichtung zu einem Aufnahmeraum für eine Antriebswelle der Hochdruckpumpe und zu mindestens einem Einlassventil der Hochdruckpumpe führt. Außerdem ist ein Rückführ-Strömungsweg vorgesehen, über den Leckage- und/oder Schmierkraftstoff zurückgeführt wird. Der Rückführ-Strömungsweg führt aus der Hochdruckpumpe heraus und mündet in eine Rücklaufleitung zu einem Tank und somit in einen Niederdruck-Strömungsweg. An der Kraftstoff-Hochdruck-Fördereinrichtung ist somit zusätzlich zum Kraftstoffeinlass wenigstens ein weiterer Anschluss für den Rückführ-Strömungsweg erforderlich, was zu einem aufwendigen Aufbau der Kraftstoff-Hochdruck-Fördereinrichtung führt.Such a fuel high-pressure conveyor for an internal combustion engine is characterized by the WO 02/40857 A known. This high-pressure fuel delivery device has a high-pressure pump and a low-pressure flow path that leads from a fuel inlet of the high-pressure fuel delivery device to a receiving space for a drive shaft of the high-pressure pump and to at least one inlet valve of the high-pressure pump. In addition, a return flow path is provided, is returned via the leakage and / or lubricating fuel. The return flow path leads out of the high pressure pump and flows into a return line to a tank and thus into a low pressure flow path. At least one further connection for the return flow path is thus required in addition to the fuel inlet at the high-pressure fuel delivery device, which leads to a complicated construction of the high-pressure fuel delivery device.

Durch die DE 197 14 488 C1 , ist eine Kraftstoff-Hochdruck-Fördereinrichtung in Form einer Hochdruckpumpe bekannt, bei der die Hochdruckpumpe nur symbolisch dargestellt ist. Bei der Hochdruckpumpe ist kein Rückführ-Strömungsweg für Leckage- und/oder Schmierkraftstoff vorhanden. Wie eine erforderliche Schmierung der Hochdruckpumpe erfolgt ist hier nicht angegeben. Von einer Verbindung zwischen der Hochdruckpumpe und einem Kraftstoffspeicher führt ein Rückführ-Strömungsweg ab, der in einen Niederdruck-Strömungsweg zur Hochdruckpumpe mündet. Sowohl der Rückführ-Strömungsweg als auch der Niederdruck-Strömungsweg sind dabei außerhalb der Hochdruckpumpe angeordnet.By the DE 197 14 488 C1 , A high-pressure fuel conveyor in the form of a high-pressure pump is known, in which the high-pressure pump is shown only symbolically. The high pressure pump does not have a return flow path for leakage and / or lubricating fuel. How a required lubrication of the high pressure pump is not specified here. From a connection between the high-pressure pump and a fuel reservoir performs a return flow path, which opens into a low-pressure flow path to the high-pressure pump. Both the return flow path and the low-pressure flow path are arranged outside the high-pressure pump.

Offenbarung der ErfindungDisclosure of the invention

Die vorliegende Erfindung hat die Aufgabe, eine Kraftstoff-Hochdruck-Fördereinrichtung der eingangs genannten Art zu schaffen, welche einen preiswerteren Aufbau des Kraftstoffsystems ermöglicht.The present invention has the object, a high-pressure fuel conveyor of the to provide the aforementioned type, which allows a cheaper construction of the fuel system.

Technische LösungTechnical solution

Diese Aufgabe wird durch eine Kraftstoff-Hochdruck-Fördereinrichtung mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen sind in Unteransprüchen angegeben. Weitere für die Erfindung wesentliche Merkmale sind ferner in der nachfolgenden Beschreibung und der Zeichnung offenbart. Dabei können die einzelnen Merkmale in ganz unterschiedlichen Kombinationen für die Erfindung wesentlich sein, ohne dass hierauf explizit hingewiesen wird.This object is achieved by a high-pressure fuel conveyor with the features of claim 1. Advantageous developments are specified in subclaims. Further essential features of the invention are further disclosed in the following description and the drawings. In this case, the individual features in very different combinations for the invention may be essential, without being explicitly noted.

Vorteilhafte WirkungenAdvantageous effects

Bei Verwendung der erfindungsgemäßen Kraftstoff-Hochdruck-Fördereinrichtung kann auf eine zu einem Tank führende Rücklaufleitung verzichtet werden. Hierdurch wird der Aufbau eines Kraftstoffsystems, in welches die erfindungsgemäße Kraftstoff-Hochdruck-Fördereinrichtung eingebaut ist, vereinfacht, wodurch bei der Herstellung als auch bei Betrieb und Wartung Kosten gespart werden.When using the fuel high-pressure conveyor according to the invention can be dispensed with leading to a tank return line. As a result, the structure of a fuel system in which the fuel high-pressure conveyor according to the invention is installed, simplified, which costs in the production and during operation and maintenance costs are saved.

Erreicht wird dies dadurch, dass der Rückführ-Strömungsweg die Kraftstoff-Hochdruck-Fördereinrichtung nicht verlässt, sondern in diese integriert ist. Der beispielsweise durch die Wellenlager und/oder Wellendichtungen der Antriebswelle hindurchtretende Kraftstoff wird also nicht zum Tank zurückgeführt, sondern verbleibt innerhalb der Kraftstoff-Hochdruck-Fördereinrichtung, indem er in den Niederdruck-Strömungsweg eingeleitet wird. Auf diese Weise wird auch eine unerwünschte Erwärmung des im Kraftstofftank gelagerten Kraftstoffes vermieden.This is achieved by the fact that the return flow path does not leave the high-pressure fuel delivery device, but is integrated into it. Thus, the fuel passing through, for example, the shaft bearings and / or shaft seals of the drive shaft is not returned to the tank but remains within the high pressure fuel delivery by being introduced into the low pressure flow path. In this way, an undesirable heating of the fuel stored in the fuel tank is avoided.

Eine vorteilhafte Ausgestaltung der erfindungsgemäßen Kraftstoff-Hochdruck-Fördereinrichtung zeichnet sich dadurch aus, dass sie eine integrierte Vorförderpumpe umfasst. Damit wird eine besonders kompakte und leistungsfähige Kraftstoff-Hochdruck-Fördereinrichtung geschaffen.An advantageous embodiment of the fuel high-pressure conveyor according to the invention is characterized in that it comprises an integrated prefeed pump. This creates a particularly compact and powerful high-pressure fuel delivery device.

In Weiterbildung hierzu ist es möglich, dass die Vorförderpumpe im Niederdruck-Strömungsweg angeordnet ist, und dass der Rückführ-Strömungsweg stromaufwärts von der Vorförderpumpe in den Niederdruck-Strömungsweg mündet. Ein Kraftstoffsystem mit einer derart ausgestalteten Kraftstoff-Hochdruck-Fördereinrichtung baut besonders einfach und kompakt.In a further development, it is possible that the prefeed pump is arranged in the low-pressure flow path, and that the return flow path upstream of the prefeed pump in the low pressure flow path opens. A fuel system with such designed high-pressure fuel delivery device is particularly simple and compact.

Dabei kann ein mechanisches Druckregelventil mit einem Rücklaufkanal vorgesehen sein, der stromaufwärts von der Vorförderpumpe in den Niederdruck-Strömungsweg mündet. Auf diese Weise wird ein konstanter Zulaufdruck zum Einlassventil der Hochdruckpumpe realisiert, und dennoch baut die Kraftstoff-Hochdruck-Fördereinrichtung kompakt und einfach, da ein separater Rücklaufkanal nicht erforderlich ist.In this case, a mechanical pressure control valve may be provided with a return channel, which opens into the low-pressure flow path upstream of the prefeed pump. In this way, a constant supply pressure to the inlet valve of the high-pressure pump is realized, and yet the high-pressure fuel delivery device is compact and simple, since a separate return channel is not required.

Alternativ kann die Kraftstoff-Hochdruck-Fördereinrichtung mit einer externen Vorförderpumpe verbindbar sein. Eine solche kann beispielsweise im Bereich des Tanks des Kraftstoffsystems vorgesehen sein, zu dem die Kraftstoff-Hochdruck-Fördereinrichtung gehört. Auf diese Weise wird vermieden, dass zwischen der Kraftstoff-Hochdruck-Fördereinrichtung und dem Tank eine Kraftstoffleitung mit vergleichsweise niedrigem Druck vorhanden ist, in der sich beispielsweise Dampfblasen bilden können.Alternatively, the high-pressure fuel delivery device can be connected to an external feed pump. Such may, for example, be provided in the region of the tank of the fuel system to which the high-pressure fuel delivery device belongs. In this way it is avoided that a fuel line with comparatively low pressure is present between the high-pressure fuel conveyor and the tank, in which, for example, vapor bubbles can form.

Eine besonders vorteilhafte Weiterbildung der erfindungsgemäßen Kraftstoff-Hochdruck-Fördereinrichtung zeichnet sich dadurch aus, dass im Niederdruck-Strömungsweg eine Saugstrahlpumpe angeordnet ist, die von dem zum Einlassventil strömenden Kraftstoff angetrieben wird und in die der Rückführung-Strömungsweg mündet. Die beispielsweise durch die Wellenlager hindurchtretende Kraftstoffmenge wird auf diese Weise von der Saugstrahlpumpe angesaugt. Die Summe der direkt vom Aufnahmeraum zum Einlassventil strömenden Kraftstoffmenge und der über den Rückfiihr-Strömungsweg rückgeführten Strömungsmenge steht dann als Hochdruckfördermenge zur Verfügung. Eine solche Kraftstoff-Hochdruck-Fördereinrichtung hat einen guten Wirkungsgrad, und darüber hinaus wird die Schmierung der Lager durch die Zwangsabsaugung des Schmierkraftstoffes verbessert. Vor allem dann, wenn eine externe Vorförderpumpe vorgesehen ist, mit der die Kraftstoff-Hochdruck-Fördereinrichtung verbindbar ist, wird durch eine solche Saugstrahlpumpe die Rückführung des Schmierkraftstoffes auch bei niedrigen Drehzahlen der Hochdruckpumpe gewährleistet.A particularly advantageous development of the high-pressure fuel delivery device according to the invention is characterized in that a suction jet pump is arranged in the low-pressure flow path, which is driven by the fuel flowing to the inlet valve and into which the return flow path opens. The passing through the shaft bearings, for example, amount of fuel is sucked in this way by the suction jet pump. The sum of the amount of fuel flowing directly from the receiving space to the intake valve and the amount of flow recirculated via the return flow path is then available as a high-pressure delivery quantity. Such a high-pressure fuel delivery device has a good efficiency, and moreover, the lubrication of the bearings is improved by the forced extraction of the lubricating fuel. Especially when an external prefeed pump is provided, with which the fuel high-pressure conveyor is connectable, the return of the lubricating fuel is ensured even at low speeds of the high pressure pump by such a suction jet pump.

Wenn die Vorförderpumpe elektrisch angetrieben wird, kann die Einstellung des Vorförderdrucks, also jenes Drucks, mit dem der Kraftstoff durch den Aufnahmeraum hindurch zum Einlassventil gefördert wird, besonders gut eingestellt werden. Darüber hinaus verfügt man dann über besonders viele Freiheitsgrade im Hinblick auf die Platzierung der Vorförderpumpe.When the prefeed pump is electrically driven, the adjustment of the prefeed pressure, that is, the pressure with which the fuel through the receiving space to the intake valve is promoted, be particularly well adjusted. In addition, one then has a particularly high degree of freedom with regard to the placement of the prefeed pump.

Wird die Vorförderpumpe dagegen mindestens mittelbar von der Brennkraftmaschine angetrieben, kann eine besonders kompakte Kraftstoff-Hochdruck-Fördereinrichtung geschaffen werden.On the other hand, if the prefeed pump is driven at least indirectly by the internal combustion engine, a particularly compact high-pressure fuel delivery device can be created.

In dem Niederdruck-Strömungsweg kann stromabwärts von der Mündung des Rückführ-Strömungswegs eine verstellbare Drosseleinrichtung angeordnet sein. Eine solche, auch als "Zumesseinheit" bezeichnete Drosseleinrichtung ermöglicht eine Einstellung der Fördermenge der Hochdruckpumpe und damit der Kraftstoff-Hochdruck-Fördereinrichtung. Durch die erfindungsgemäß vorgeschlagene Platzierung der Drosseleinrichtung wird die Fördermenge durch die über den Rückführ-Strömungsweg rückgeführte Kraftstoffmenge nicht beeinflusst.In the low-pressure flow path, an adjustable throttle device may be disposed downstream of the mouth of the return flow path. Such, also referred to as "metering unit" throttle device allows adjustment of the delivery of the high-pressure pump and thus the high-pressure fuel conveyor. As a result of the placement of the throttle device proposed according to the invention, the delivery rate is not influenced by the amount of fuel returned via the return flow path.

In dem Rückführ-Strömungsweg kann mindestens eine Strömungsdrossel angeordnet sein. Durch diese kann die über den Rückführ-Strömungsweg rückgeführte Kraftstoffmenge gezielt eingestellt werden, was den Wirkungsgrad der erfindungsgemäßen Kraftstoff-Hochdruck-Fördereinrichtung nochmals verbessert.At least one flow restrictor may be arranged in the return flow path. Through this, the amount of fuel returned via the return flow path can be set specifically, which further improves the efficiency of the high-pressure fuel delivery device according to the invention.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Nachfolgend werden besonders bevorzugte Ausführungsbeispiele der vorliegenden Erfindung unter Bezugnahme auf die beiliegende Zeichnung näher erläutert. In der Zeichnung zeigen:

Figur 1
eine schematische Darstellung eines Kraftstoffsystems mit einer ersten Ausführungsform einer Kraftstoff-Hochdruck-Fördereinrichtung; und
Figur 2
eine Darstellung ähnlich Figur 1, jedoch mit einer zweiten Ausführungsform einer Kraftstoff-Hochdruck-Fördereinrichtung.
Hereinafter, particularly preferred embodiments of the present invention will be explained in more detail with reference to the accompanying drawings. In the drawing show:
FIG. 1
a schematic representation of a fuel system with a first embodiment of a high-pressure fuel conveyor; and
FIG. 2
a representation similar FIG. 1 but with a second embodiment of a high-pressure fuel delivery device.

Ausführungsformen der ErfindungEmbodiments of the invention

In Figur 1 trägt ein Kraftstoffsystem insgesamt das Bezugszeichen 10. Es gehört zu einer nicht gezeigten Brennkraftmaschine, die wiederum ein nicht gezeigtes Kraftfahrzeug antreibt.In FIG. 1 a fuel system carries the overall reference numeral 10. It belongs to an internal combustion engine, not shown, which in turn drives a motor vehicle, not shown.

Das Kraftstoffsystem 10 umfasst einen Kraftstofftank 12, in dem ein flüssiger Kraftstoff, beispielsweise Benzin oder Diesel, bevorratet ist. Von dem Kraftstofftank 12 führt eine Kraftstoffleitung 14 über einen Filter 16 zu einer Kraftstoff-Hochdruck-Fördereinrichtung 18. In dieser wird der Kraftstoff auf einen hohen Druck komprimiert und zu einem Kraftstoff-Druckspeicher 20 gefördert, der auch als "Rail" bezeichnet wird. An das Rail 20 sind mehrere Kraftstoff-Einspritzvorrichtungen 22 angeschlossen, die den Kraftstoff direkt in ihnen zugeordnete Brennräume (nicht dargestellt) der Brennkraftmaschine einspritzen. An das Rail 20 ist ein steuerbares Überdruckventil 24 angeschlossen, von dem eine Ablaufleitung 26 zum Kraftstofftank 12 zurückführt.The fuel system 10 includes a fuel tank 12 in which a liquid fuel, such as gasoline or diesel, is stored. From the fuel tank 12, a fuel line 14 via a filter 16 to a high-pressure fuel conveyor 18. In this, the fuel is compressed to a high pressure and conveyed to a fuel pressure accumulator 20, which is also referred to as "rail". To the rail 20 a plurality of fuel injectors 22 are connected, which inject the fuel directly into them associated combustion chambers (not shown) of the internal combustion engine. To the rail 20, a controllable pressure relief valve 24 is connected, from which a drain line 26 leads back to the fuel tank 12.

Die Kraftstoff-Hochdruck-Fördereinrichtung 18 umfasst einen Kraftstoffeinlass 28, an den die Kraftstoffleitung 14 angeschlossen ist. Vom Kraftstoffeinlass 28 führt ein Kanal 30 zu einer Vorförderpumpe 32, die in die Kraftstoff-Hochdruck-Fördereinrichtung 18 integriert ist. Von der Vorförderpumpe 32 führt ein Kanal 34 zu einer Hochdruckpumpe 36. Die Hochdruckpumpe 36 wird ebenso wie die Vorförderpumpe 32 mechanisch von der Brennkraftmaschine, beispielsweise von einer Nockenwelle der Brennkraftmaschine, angetrieben. Die Hochdruckpumpe 36 umfasst ein Gehäuse 38 mit einem Aufnahmeraum 40 für eine mit einem Nocken 42 versehene Antriebswelle 44. Diese arbeitet mit zwei Kolben 46a und 46b zusammen, die Förderräume 48a beziehungsweise 48b begrenzen.The high-pressure fuel delivery device 18 includes a fuel inlet 28 to which the fuel line 14 is connected. From the fuel inlet 28, a channel 30 leads to a prefeed pump 32, which is integrated into the high-pressure fuel delivery device 18. From the prefeed pump 32, a channel 34 leads to a high-pressure pump 36. The high-pressure pump 36 as well as the prefeed pump 32 is mechanically driven by the internal combustion engine, for example by a camshaft of the internal combustion engine. The high pressure pump 36 comprises a housing 38 having a receiving space 40 for a provided with a cam 42 drive shaft 44. This works with two pistons 46 a and 46 b together, the delivery spaces 48 a and 48 b limit.

Vom Aufnahmeraum 40 führt ein Kanal 50 zu einer verstellbaren Drosseleinrichtung 52, von der wiederum Kanäle 54a und 54b über Einlassventile 56a und 56b zu den Förderräumen 48a und 48b führen. Kanäle 58a und 58b verbinden die Förderräume 48a und 48b mit Auslassventilen 60a und 60b. Diese bilden gleichzeitig einen Kraftstoffauslass der Kraftstoff-Hochdruck-Fördereinrichtung, an den das Rail 20 angeschlossen ist.From the receiving space 40, a channel 50 leads to an adjustable throttling device 52, from which in turn pass channels 54a and 54b via intake valves 56a and 56b to the delivery chambers 48a and 48b. Channels 58a and 58b connect delivery chambers 48a and 48b to exhaust valves 60a and 60b. These simultaneously form a fuel outlet of the high-pressure fuel delivery device, to which the rail 20 is connected.

Die Antriebswelle 44 ist im Gehäuse 38 der Hochdruckpumpe 36 durch Wellenlager gelagert. Der Aufnahmeraum 40 ist über entsprechende Wellendichtungen nach außen hin abgedichtet. Diese sind jedoch nicht absolut dicht und daher in Figur 1 durch Kanäle 62a und 62b und entsprechende Drosseln 64a und 64b bezeichnet. Die Drossel beziehungsweise Wellendichtung 64a ist dabei in einem Gehäusedeckel, die Drossel beziehungsweise Wellendichtung 64b in einem Gehäusekörper angeordnet. Über Begrenzungsdrosseln 65a und 65b führen die Kanäle 62a und 62b zum Kanal 30 zurück. Die Mündung ist mit 66 bezeichnet. Vom Kanal 50 zweigt noch ein Überströmkanal 68 ab, in dem ein mechanisches Druckregel- beziehungsweise Überströmventil 70 angeordnet ist. Der Überströmkanal 68 mündet in den Kanal 62a und somit letztlich bei 66 in den Kanal 30.The drive shaft 44 is mounted in the housing 38 of the high-pressure pump 36 by shaft bearings. The receiving space 40 is sealed to the outside via corresponding shaft seals. However, these are not absolutely tight and therefore in FIG. 1 by channels 62a and 62b and corresponding throttles 64a and 64b. The throttle or shaft seal 64a is arranged in a housing cover, the throttle or shaft seal 64b in a housing body. About limiting throttles 65a and 65b lead the channels 62a and 62b back to the channel 30. The mouth is designated 66. From the channel 50, an overflow channel 68 branches off, in which a mechanical pressure control or overflow valve 70 is arranged. The overflow channel 68 opens into the channel 62 a and thus ultimately into the channel 30 at 66.

In den Kanälen 30, 34, im Aufnahmeraum 40, im Kanal 50 und in den Kanälen 54a und 54b herrscht ein vergleichsweise niedriger Druck. Dieser Strömungsweg wird daher auch als "Niederdruck-Strömungsweg" bezeichnet. Er trägt insgesamt das Bezugszeichen 72. Der durch die Wellendichtungen 64a und 64b hindurchtretende Kraftstoff wird über die Kanäle 62a und 62b zur Mündung 66 zurückgeführt. Die Kanäle 62a und 62b werden daher auch als "Rückführ-Strömungsweg" bezeichnet.In the channels 30, 34, in the receiving space 40, in the channel 50 and in the channels 54a and 54b, there is a comparatively low pressure. This flow path is therefore also referred to as "low-pressure flow path". Overall, it bears the reference numeral 72. The fuel passing through the shaft seals 64a and 64b is returned to the orifice 66 via the channels 62a and 62b. The channels 62a and 62b are therefore also referred to as the "return flow path".

Im Betrieb wird der Kraftstoff von der Vorförderpumpe 32 aus dem Kraftstofftank 12 angesaugt und auf einen vergleichsweise niedrigen Vorförderdruck, beispielsweise 4 bar, verdichtet und mit diesem Druck in den Aufnahmeraum 40 gefördert. Dort dient er zur Kühlung und Schmierung der Lager der Antriebswelle 44. Vom Aufnahmeraum 40 strömt der Kraftstoff über die verstellbare Drossel 52 zu den Einlassventilen 56a, b und weiter in die Förderräume 48a, b, wo er komprimiert und über die Auslassventile 60a, b zum Rail 20 gefördert wird. Der für die Schmierung der Lager der Antriebswelle 44 und über die Wellendichtungen 64a, b hindurchtretende Kraftstoff wird über den Rückführ-Strömungsweg 62a, b auf die Saugseite (Kanal 30) der Vorförderpumpe 32 gefördert und von dieser wieder angesaugt.In operation, the fuel is sucked in by the prefeed pump 32 from the fuel tank 12 and compressed to a comparatively low prefeed pressure, for example 4 bar, and conveyed into the receiving space 40 at this pressure. There it serves to cool and lubricate the bearings of the drive shaft 44. From the receiving space 40, the fuel flows via the adjustable throttle 52 to the intake valves 56a, b and on into the delivery chambers 48a, b, where it is compressed and via the outlet valves 60a, b for Rail 20 is promoted. The fuel which passes through for the lubrication of the bearings of the drive shaft 44 and via the shaft seals 64a, b is conveyed via the return flow path 62a, b to the suction side (channel 30) of the prefeed pump 32 and sucked back therefrom.

Ein Kraftstoffsystem 10 mit einer alternativen Ausführungsform einer Kraftstoff-Hochdruck-Fördereinrichtung 18 ist in Figur 2 dargestellt. Dabei gilt, dass solche Elemente und Bereiche, die äquivalente Funktionen zu vorab beschriebenen Elementen und Bereichen aufweisen, die gleichen Bezugszeichen tragen und nicht nochmals näher erläutert sind.A fuel system 10 with an alternative embodiment of a high pressure fuel delivery device 18 is shown in FIG FIG. 2 shown. It is true that such elements and areas that have equivalent functions to previously described elements and areas, the same reference numerals and are not explained in detail again.

Bei dem Kraftstoffsystem 10 von Figur 2 ist die Vorförderpumpe 32 nicht in die Kraftstoff-Hochdruck-Fördereinrichtung 18 integriert, sondern als externe Vorförderpumpe 32 im Bereich des Kraftstofftanks 12 angeordnet. Sie wird ferner nicht von der Brennkraftmaschine, sondern elektrisch angetrieben. Auch das Druckregelventil 70 mit dem Überströmkanal 68 ist im Bereich der Vorförderpumpe 32 nahe zum Kraftstofftank 12 angeordnet.In the fuel system 10 of FIG. 2 the prefeed pump 32 is not integrated into the high-pressure fuel conveyor 18, but arranged as an external prefeed pump 32 in the region of the fuel tank 12. It is also not powered by the internal combustion engine, but electrically. The pressure control valve 70 with the overflow channel 68 is arranged in the region of the prefeed pump 32 close to the fuel tank 12.

Im Kanal 50, der vom Aufnahmeraum 40 über die verstellbare Drossel 52 zu den Kanälen 54a, b und weiter zu den Einlassventilen 56a, b führt, ist eine Saugstrahlpumpe 74 angeordnet. Diese wird also von dem vom Aufnahmeraum 40 zu den Einlassventilen 56a, b strömenden Kraftstoff angetrieben, und in sie mündet in 66 der Rückführ-Strömungsweg 62a, b.In the channel 50, which leads from the receiving space 40 via the adjustable throttle 52 to the channels 54a, b and on to the inlet valves 56a, b, an ejector 74 is arranged. This is thus driven by the fuel flowing from the receiving space 40 to the inlet valves 56a, b, and in 66 opens the return flow path 62a, b.

Claims (11)

  1. High-pressure fuel delivery device (18) for an internal combustion engine, the high-pressure fuel delivery device (18) comprising at least one high-pressure pump (36) and flow paths (30, 34, 40, 50, 58a, 58b, 72) through which fuel passes from a fuel inlet (28) of the high-pressure fuel delivery device (18) to a fuel outlet (60a, 60b) of the high-pressure fuel delivery device (18), wherein the flow paths (30, 34, 40, 50, 58a, 58b, 72) comprise a low-pressure flow path (72), which leads from a fuel inlet (28) of the high-pressure fuel delivery device (18) to a receiving chamber (40) for a drive shaft (44) of the high-pressure pump (36) and to at least one inlet valve (56) of the high-pressure pump (36), and having a return flow path (62) via which leakage and/or lubricating fuel is returned, wherein the return flow path (62) opens into the low-pressure flow path (72), characterized in that the low-pressure flow path (72) leads to the receiving chamber (40) and onward to the at least one inlet valve (56), in that the return flow path (62) is integrated into the high-pressure fuel delivery device (18) and does not exit the latter, and in that the return flow path (62) opens into the low-pressure flow path (72) within the high-pressure fuel delivery device (18).
  2. High-pressure fuel delivery device (18) according to Claim 1, characterized in that it comprises an integrated predelivery pump (32).
  3. High-pressure fuel delivery device (18) according to Claim 2, characterized in that the predelivery pump (32) is arranged in the low-pressure flow path (72), and in that the return flow path (62) opens (66) into the low-pressure flow path (72) upstream of the predelivery pump (32).
  4. High-pressure fuel delivery device (18) according to either of Claims 2 and 3, characterized in that it comprises a mechanical pressure-regulating valve (70) having an overflow duct (68) which opens into the low-pressure flow path (72) upstream of the predelivery pump (32).
  5. High-pressure fuel delivery device (18) according to Claim 1, characterized in that it can be connected to an external predelivery pump (32).
  6. High-pressure fuel delivery device (18) according to Claim 5, characterized in that the return flow path (62) opens (66) into the low-pressure flow path (72) between the receiving chamber (40) and the inlet valve (56).
  7. High-pressure fuel delivery device (18) according to one of the preceding claims, characterized in that a suction jet pump (74) is arranged in the low-pressure flow path (72), which suction jet pump is driven by the fuel flowing to the inlet valve (56) and opens (66) into the return flow path (62).
  8. High-pressure fuel delivery device (18) according to one of Claims 2 to 7, characterized in that the predelivery pump (32) is electrically driven.
  9. High-pressure fuel delivery device (18) according to one of Claims 2 to 7, characterized in that the predelivery pump (32) is driven at least indirectly by the internal combustion engine.
  10. High-pressure fuel delivery device (18) according to one of the preceding claims, characterized in that an adjustable throttle device (52) is arranged in the low-pressure flow path (72) downstream of the opening (66) of the return flow path (62).
  11. High-pressure fuel delivery device (18) according to one of the preceding claims, characterized in that at least one flow throttle (65) is arranged in the return flow path (62).
EP07726366A 2006-04-21 2007-02-14 High-pressure fuel delivery device Not-in-force EP2013471B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006018702A DE102006018702A1 (en) 2006-04-21 2006-04-21 Fuel high-pressure conveying device
PCT/EP2007/051410 WO2007122023A1 (en) 2006-04-21 2007-02-14 High-pressure fuel delivery device

Publications (2)

Publication Number Publication Date
EP2013471A1 EP2013471A1 (en) 2009-01-14
EP2013471B1 true EP2013471B1 (en) 2011-11-30

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EP07726366A Not-in-force EP2013471B1 (en) 2006-04-21 2007-02-14 High-pressure fuel delivery device

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EP (1) EP2013471B1 (en)
CN (1) CN101427020A (en)
AT (1) ATE535707T1 (en)
BR (1) BRPI0706557A2 (en)
DE (1) DE102006018702A1 (en)
WO (1) WO2007122023A1 (en)

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DE102008017222A1 (en) * 2008-04-04 2009-10-08 Continental Automotive Gmbh Pump arrangement for conveying a fluid
DE102008001704A1 (en) 2008-05-09 2009-11-12 Robert Bosch Gmbh Fuel conveying system for internal-combustion engine, has hydraulic control line in connection with return pipe over working throttle for hydraulically actuating valve piston, and pressure-relief valve switched parallel to working throttle
DE102010026159A1 (en) 2010-07-06 2012-01-12 Audi Ag Fuel system for an internal combustion engine
DE102010042587A1 (en) * 2010-10-18 2012-04-19 Robert Bosch Gmbh Fuel pump for a fuel injection system of an internal combustion engine
DE102011003089A1 (en) 2011-01-25 2012-07-26 Robert Bosch Gmbh Overflow valve of a force injection system
DE102011075474A1 (en) 2011-05-09 2012-11-15 Robert Bosch Gmbh High pressure pump for fuel injection system, has pump housing, in which pump element is received, where pump element is arranged radially around drive shaft
DE102011089623A1 (en) 2011-12-22 2013-06-27 Robert Bosch Gmbh 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
DE102012203724A1 (en) 2012-03-09 2013-09-12 Robert Bosch Gmbh 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
DE102012210177A1 (en) 2012-06-18 2013-12-19 Robert Bosch Gmbh Fuel feed device for, e.g. common-rail fuel injection system, has a pre-feed pump functioning as a regulated electrical fuel pump, and a machine room connected to return line through shaft bearings connected in parallel to a throttle
DE102012212062A1 (en) 2012-07-11 2014-01-16 Robert Bosch Gmbh Low pressure circuit for a fuel injection system, fuel injection system and method of operating a fuel injection system
DE102015217863A1 (en) * 2015-09-17 2017-03-23 Continental Automotive Gmbh Fuel injection system
EP3601777B1 (en) * 2017-03-29 2021-10-27 Wärtsilä Finland Oy A high pressure fuel pump assembly for an internal combustion piston engine

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DE19714488C1 (en) 1997-04-08 1998-09-03 Siemens Ag Fuel injection system for IC engine, particularly diesel engine
DE19941689A1 (en) * 1999-09-01 2001-03-15 Siemens Ag Fuel injection device for an automobile engine
DE10057244A1 (en) 2000-11-18 2002-06-06 Bosch Gmbh Robert Fuel injection system for internal combustion engines with improved starting behavior
DE10205187A1 (en) * 2002-02-08 2003-08-21 Bosch Gmbh Robert Fuel injection device for an internal combustion engine
JP3915718B2 (en) * 2003-03-11 2007-05-16 株式会社デンソー Fuel supply pump

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BRPI0706557A2 (en) 2011-03-29
ATE535707T1 (en) 2011-12-15
CN101427020A (en) 2009-05-06
WO2007122023A1 (en) 2007-11-01
EP2013471A1 (en) 2009-01-14
DE102006018702A1 (en) 2007-10-25

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