EP1342002B1 - Fuel pump for a motor vehicle - Google Patents

Fuel pump for a motor vehicle Download PDF

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Publication number
EP1342002B1
EP1342002B1 EP01984705A EP01984705A EP1342002B1 EP 1342002 B1 EP1342002 B1 EP 1342002B1 EP 01984705 A EP01984705 A EP 01984705A EP 01984705 A EP01984705 A EP 01984705A EP 1342002 B1 EP1342002 B1 EP 1342002B1
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EP
European Patent Office
Prior art keywords
fuel
electric motor
fuel pump
stage
main stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01984705A
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German (de)
French (fr)
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EP1342002A1 (en
Inventor
Rolf Reinhardt
Thomas Werner
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Siemens AG
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Siemens AG
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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
    • 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
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps
    • 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
    • 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
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank

Definitions

  • the invention relates to a fuel pump for a motor vehicle, consisting of a preliminary stage and a main stage, for delivering the fuel to one Internal combustion engine of the motor vehicle and an electric motor for driving the preliminary and main stages.
  • DE-U-9 104 511 describes such a fuel pump.
  • Such fuel pumps known for gasoline or diesel fuel are in today's motor vehicles are often used.
  • the fuel pump forms in the Usually with one to be inserted into an opening in the fuel tank Flange a pre-assembled, structural unit.
  • the flange carries one Connection piece on which a flow line leading to the internal combustion engine can be connected, and a connector for one of the Internal combustion engine returning return line.
  • the one from the internal combustion engine Returned fuel then becomes the fuel tank or fed to a baffle.
  • the pre-stage and the main stage often as an axial flow side channel pump or peripheral pump trained and together on the bottom of the baffle facing end of the electric motor.
  • a shaft of the electric motor drives an impeller of the pre-stage and the main stage.
  • the prepress and the main stage are together with the electric motor Housing arranged.
  • the electric motor is from that of the main stage flows through delivered fuel.
  • a disadvantage of known fuel pumps is that on the internal combustion engine fuel that is not required, but is heated by it via the Return line is led back into the baffle. With renewed funding of this fuel by the fuel pump, the fuel is particularly in the main stage warmed even further. This can cause problems as a result the low heat resistance of the electric motor, especially the coal collector system and the adjacent electrical wiring. Because of this, the temperature of the fuel is up after the main stage limited a permissible value, or the returned fuel had to be cooled become.
  • Another disadvantage is that the one promoted by the main stage Fuel swirls as it flows through the electric motor. This tends to Fuel to form vapor bubbles that form a foam with the fuel form the reliable supply of the internal combustion engine with fuel negatively affected.
  • the fuel pump comes to a standstill due to leakage between the main and preliminary stages of the fuel pump to an idle Fuel pump, the engine compartment of the fuel pump between the Pressure outlet and the main stage fills with air. Furthermore, the baffle can run down the same way to the level of the main tier storage location. This leads to the low fill level in the surge pot at one Restart of the internal combustion engine at relatively long start times or misfires the internal combustion engine.
  • the invention is based on the problems of a fuel pump at the outset mentioned type so that the electric motor of the fuel pump no longer thermally stressed by the fuel and a quick and secure supply of the internal combustion engine with fuel is guaranteed.
  • the main stage the fuel pump directly with the flow line to the internal combustion engine is connected and is fluidically decoupled from the electric motor.
  • the Intake manifold of the main stage connects to one of the preliminary stages Fuel-filled component, in particular a baffle or a fuel filter.
  • An advantage of the fuel pump according to the invention is that Volume of the flow line between the main stage and the internal combustion engine can be kept very small.
  • the Air cushions forming the fuel pump in the electric motor between the supply line and the main stage in previous fuel pumps is avoided. Therefore is when the engine starts with an almost empty fuel tank a delay in the delivery of fuel to the internal combustion engine kept particularly low.
  • the baffle or the Fuel tank fuel returned from the internal combustion engine can be supplied to a higher temperature, because with renewed funding by the main stage of the fuel which is now hot due to the warming no longer through the electric motor, but directly into the flow line. So unnecessary heating of the electric motor is prevented. This leads to a particularly long service life of the electric motor.
  • this design swirls the fuel delivered by the main stage avoided by the electric motor, so that foaming in the Flow line is prevented. With the fuel pump according to the invention thus ensuring a reliable supply of fuel to the internal combustion engine.
  • the main stage arranged on the side of the electric motor opposite the preliminary stage.
  • this arrangement has the advantage that this fuel pump is very quiet as it is mainly for noise Responsible main stage further from the bottom of the fuel tank is removed.
  • the Pressure line of the preliminary stage approximately at the level of the main stage or above the Intake nozzle opens into a baffle. This ensures that on the one hand, there is always a sufficient amount of fuel in the surge pot for the Main level is available and that on the other hand the main level is always with Fuel is full or at least instant fuel at start-up draws in fuel and therefore immediately after starting the electric motor promotes.
  • Suction of foamed fuel foam present in the swirl pot can be according to another advantageous development of the invention largely avoid if the main stage is outside the electric motor has suction line led into the bottom area of the baffle.
  • the fuel pump according to the invention is particularly easy to install, if the main stage on its side facing away from the electric motor Flange with one connection piece each for your suction line and your flow line having.
  • the pressure line of the preliminary stage is advantageously led by the electric motor.
  • the fuel pump according to the invention thereby lubricating the bearings and cooling the coal collector system at the same time allows. It is crucial, however, that the fuel warmed and outgassing fuel due to the delivery a component is reassured so that the intake manifold of the main stage Bubble-free fuel is drawn from this component.
  • a fuel pump 3 is arranged in a swirl pot 2 arranged near a bottom of a fuel tank 1.
  • the fuel pump 3 has a housing 4 made of aluminum or steel with an electric motor 5 arranged therein.
  • the electric motor 5 serves to drive a preliminary stage 6 and a main stage 7.
  • the preliminary stage 6 is arranged near a bottom of the baffle 2, while the main stage 7 is located on the opposite side of the electric motor 5.
  • the baffle 2 has an opening 8 in its bottom region, into which the fuel pump 3 is inserted in a sealing manner.
  • a fuel filter 9, 10 is located below the surge pot 2 and in the upper region thereof. Fuel can flow into the surge pot 2 through the upper fuel filter 10 when the level of fuel in the fuel tank 1 is sufficiently high.
  • the preliminary stage 6 and the main stage 7 are designed as side channel pumps and each have an impeller 12, 13 fastened to a shaft 11 of the electric motor 5.
  • the preliminary stage 6 is connected via a suction line 14 to the fuel filter 9 arranged below the swirl pot 2 and via a pressure line 15 to the swirl pot 2.
  • the preliminary stage 6 When the preliminary stage 6 is driven by the electric motor 5, the preliminary stage 6 thus sucks fuel from the fuel tank 1 and conveys it into the surge pot 2.
  • the pressure line 15 is guided through the electric motor 5 and ends at the level of the main stage 7.
  • the main stage 7 has, on its side facing away from the electric motor 5, a pressure connection 16 for a feed line 17 and a suction connection 18 arranged on the circumference of the fuel pump 3 for a suction line 19.
  • the suction line 19 is led into the bottom region of the surge pot 2 and sucks the from there Fuel.
  • the flow line is led upwards within the fuel tank 1.
  • Fuel delivered via the feed line 17 reaches an internal combustion engine (not shown) of the motor vehicle.
  • Fuel that is not required is fed into the surge pot 2 via a return 20. This fuel is conveyed via the suction line 19 from the main stage 7 to the internal combustion engine again without flowing through the electric motor 5 again.
  • FIG. 2 shows an embodiment of the inventive design that has changed in construction
  • Fuel pump 3 The fuel pump 3 is arranged in a fuel tank 1.
  • the pressure line 15 of the preliminary stage 6 is through the electric motor 5 to led to a fuel fine filter 21.
  • the main stage 7 is a gerotor pump.
  • On the side of the main stage 7 facing away from the electric motor 5 are the Sockets 16, 18 for the suction line 19 and the flow line 17 are arranged. From there, the fuel is discharged from the main stage 7 through the intake port 18 sucked in and conveyed further to the internal combustion engine via the feed line 17. Fuel that is not required is fed into the fuel tank via a return 20 1 headed.

Description

Die Erfindung betrifft eine Kraftstoffpumpe für ein Kraftfahrzeug, bestehend aus einer Vorstufe und einer Hauptstufe, zum Fördern des Kraftstoffes zu einer Brennkraftmaschine des Kraftfahrzeuges und einem Elektromotor zum Antrieb der Vorstufe und Hauptstufe. DE-U-9 104 511 beschreibt solch eine Kraftstoffpumpe.The invention relates to a fuel pump for a motor vehicle, consisting of a preliminary stage and a main stage, for delivering the fuel to one Internal combustion engine of the motor vehicle and an electric motor for driving the preliminary and main stages. DE-U-9 104 511 describes such a fuel pump.

Solche für Benzin oder Dieselkraftstoff bekannte Kraftstoffpumpen werden in heutigen Kraftfahrzeugen häufig eingesetzt. Die Kraftstoffpumpe bildet in der Regel mit einem in eine Öffnung des Kraftstoffbehälters einzusetzenden Flansch eine vormontierbare, bauliche Einheit. Der Flansch trägt dabei einen Anschlußstutzen, an dem eine zu der Brennkraftmaschine führende Vorlaufleitung angeschlossen werden kann, und einen Anschlußstutzen für eine von der Brennkraftmaschine zurückführende Rücklaufleitung. Der von der Brennkraftmaschine zurückgeführte Kraftstoff wird anschließend dem Kraftstoffbehälter oder einem Schwalltopf zugeführt. Hierbei sind die Vorstufe und die Hauptstufe häufig jeweils als axial durchströmte Seitenkanalpumpe oder Peripheralpumpe ausgebildet und gemeinsam an dem zum Bodenbereich des Schwalltopfes weisenden Ende des Elektromotors angeordnet. Eine Welle des Elektromotors treibt jeweils ein Laufrad der Vorstufe und der Hauptstufe an. Die Vorstufe und die Hauptstufe sind dabei zusammen mit dem Elektromotor in einem gemeinsamen Gehäuse angeordnet. Der Elektromotor wird von dem von der Hauptstufe geförderten Kraftstoff durchströmt.Such fuel pumps known for gasoline or diesel fuel are in today's motor vehicles are often used. The fuel pump forms in the Usually with one to be inserted into an opening in the fuel tank Flange a pre-assembled, structural unit. The flange carries one Connection piece on which a flow line leading to the internal combustion engine can be connected, and a connector for one of the Internal combustion engine returning return line. The one from the internal combustion engine Returned fuel then becomes the fuel tank or fed to a baffle. Here are the pre-stage and the main stage often as an axial flow side channel pump or peripheral pump trained and together on the bottom of the baffle facing end of the electric motor. A shaft of the electric motor drives an impeller of the pre-stage and the main stage. The prepress and the main stage are together with the electric motor Housing arranged. The electric motor is from that of the main stage flows through delivered fuel.

Ein Nachteil bekannter Kraftstoffpumpen besteht darin, daß an der Brennkraftmaschine nicht benötigter, jedoch von ihr aufgeheizter Kraftstoff über die Rücklaufleitung wieder in den Schwalltopf geführt wird. Bei erneuter Förderung dieses Kraftstoffs durch die Kraftstoffpumpe wird der Kraftstoff insbesondere in der Hauptstufe noch weiter erwärmt. Dadurch kann es zu Problemen infolge der geringen Hitzebeständigkeit des Elektromotors, insbesondere des Kohle-Kollektor-Systems und der angrenzenden elektrischen Beschaltung kommen. Aus diesem Grund ist die Temperatur des Kraftstoffs nach der Hauptstufe auf einen zulässigen Wert begrenzt, bzw. der zurückgeführte Kraftstoff mußte gekühlt werden.A disadvantage of known fuel pumps is that on the internal combustion engine fuel that is not required, but is heated by it via the Return line is led back into the baffle. With renewed funding of this fuel by the fuel pump, the fuel is particularly in the main stage warmed even further. This can cause problems as a result the low heat resistance of the electric motor, especially the coal collector system and the adjacent electrical wiring. Because of this, the temperature of the fuel is up after the main stage limited a permissible value, or the returned fuel had to be cooled become.

Ein weiterer Nachteil besteht darin, daß der von der Hauptstufe geförderte Kraftstoff beim Durchfließen des Elektromotors verwirbelt. Hierdurch neigt der Kraftstoff zur Bildung von Dampfblasen, die mit dem Kraftstoff einen Schaum bilden, der die zuverlässige Versorgung der Brennkraftmaschine mit Kraftstoff negativ beeinträchtigt.Another disadvantage is that the one promoted by the main stage Fuel swirls as it flows through the electric motor. This tends to Fuel to form vapor bubbles that form a foam with the fuel form the reliable supply of the internal combustion engine with fuel negatively affected.

Weiterhin kommt es im Stillstand der Kraftstoffpumpe aufgrund von Leckage zwischen der Haupt- und Vorstufe der Kraftstoffpumpe zu einem Leerlaufen der Kraftstoffpumpe, wobei sich der Motorraum der Kraftstoffpumpe zwischen dem Druckabgang und der Hauptstufe mit Luft füllt. Des weiteren kann der Schwalltopf über den gleichen Weg bis auf die Höhe der Hauptstufenlagerstelle leerlaufen. Das führt infolge des zu geringen Füllstandes im Schwalltopf bei einem Neustart der Brennkraftmaschine zu relativ langen Startzeiten, bzw. zu Aussetzern der Brennkraftmaschine.Furthermore, the fuel pump comes to a standstill due to leakage between the main and preliminary stages of the fuel pump to an idle Fuel pump, the engine compartment of the fuel pump between the Pressure outlet and the main stage fills with air. Furthermore, the baffle can run down the same way to the level of the main tier storage location. This leads to the low fill level in the surge pot at one Restart of the internal combustion engine at relatively long start times or misfires the internal combustion engine.

Der Erfindung liegen die Probleme zugrunde, eine Kraftstoffpumpe der eingangs genannten Art so zu gestalten, daß der Elektromotor der Kraftstoffpumpe durch den Kraftstoff thermisch nicht mehr belastet und eine schnelle und sichere Versorgung der Brennkraftmaschine mit Kraftstoff gewährleistet wird.The invention is based on the problems of a fuel pump at the outset mentioned type so that the electric motor of the fuel pump no longer thermally stressed by the fuel and a quick and secure supply of the internal combustion engine with fuel is guaranteed.

Diese Probleme werden erfindungsgemäß dadurch gelöst, daß die Hauptstufe der Kraftstoffpumpe unmittelbar mit der Vorlaufleitung zur Brennkraftmaschine verbunden ist und vom Elektromotor fluidisch entkoppelt ist. Dazu besitzt der Ansaugstutzen der Hauptstufe eine Verbindung zu einem von der Vorstufe mit Kraftstoff gefülltem Bauteil, insbesondere einem Schwalltopf oder einem Kraftstoffilter.According to the invention, these problems are solved in that the main stage the fuel pump directly with the flow line to the internal combustion engine is connected and is fluidically decoupled from the electric motor. For that the Intake manifold of the main stage connects to one of the preliminary stages Fuel-filled component, in particular a baffle or a fuel filter.

Ein Vorteil der erfindungsgemäßen Kraftstoffpumpe besteht darin, daß sich das Volumen der Vorlaufleitung zwischen der Hauptstufe und der Brennkraftmaschine sehr klein halten läßt. Insbesondere das sich bei einem Stillstand der Kraftstoffpumpe bildende Luftpolster im Elektromotor zwischen der Vorlaufleitung und der Hauptstufe bei bisherigen Kraftstoffpumpen wird vermieden. Deshalb wird bei einem Start der Brennkraftmaschine mit fast leerem Kraftstoffbehälter eine Verzögerung der Förderung des Kraftstoffs zu der Brennkraftmaschine besonders gering gehalten. Weiterhin kann dem Schwalltopf oder dem Kraftstoffbehälter von der Brennkraftmaschine zurückgeführter Kraftstoff mit einer höheren Temperatur zugeführt werden, da bei erneuter Förderung durch die Hauptstufe der infolge der Erwärmung nunmehr heiße Kraftstoff nicht mehr durch den Elektromotor, sondern direkt in die Vorlaufleitung geführt wird. So wird eine unnötige Aufheizung des Elektromotors verhindert. Dies führt zu einer besonders hohen Lebensdauer des Elektromotors. Darüber hinaus wird durch diese Gestaltung eine Verwirbelung des von der Hauptstufe geförderten Kraftstoffs durch den Elektromotor vermieden, so daß eine Schaumbildung in der Vorlaufleitung verhindert wird. Mit der erfindungsgemäßen Kraftstoffpumpe ist somit eine zuverlässige Versorgung der Brennkraftmaschine mit Kraftstoff sichergestellt.An advantage of the fuel pump according to the invention is that Volume of the flow line between the main stage and the internal combustion engine can be kept very small. In particular, when the Air cushions forming the fuel pump in the electric motor between the supply line and the main stage in previous fuel pumps is avoided. Therefore is when the engine starts with an almost empty fuel tank a delay in the delivery of fuel to the internal combustion engine kept particularly low. Furthermore, the baffle or the Fuel tank fuel returned from the internal combustion engine can be supplied to a higher temperature, because with renewed funding by the main stage of the fuel which is now hot due to the warming no longer through the electric motor, but directly into the flow line. So unnecessary heating of the electric motor is prevented. This leads to a particularly long service life of the electric motor. In addition, by this design swirls the fuel delivered by the main stage avoided by the electric motor, so that foaming in the Flow line is prevented. With the fuel pump according to the invention thus ensuring a reliable supply of fuel to the internal combustion engine.

In einer besonders vorteilhaften Ausgestaltung der Erfindung ist die Hauptstufe auf der der Vorstufe gegenüberliegenden Seite des Elektromotors angeordnet. Neben der Verkürzung der Vorlaufleitung hat diese Anordnung den Vorteil, daß diese Kraftstoffpumpe sehr leise ist, da die hauptsächlich für die Geräuschbildung verantwortliche Hauptstufe weiter vom Boden des Kraftstoffbehälters entfernt ist. In a particularly advantageous embodiment of the invention, the main stage arranged on the side of the electric motor opposite the preliminary stage. In addition to shortening the flow line, this arrangement has the advantage that this fuel pump is very quiet as it is mainly for noise Responsible main stage further from the bottom of the fuel tank is removed.

In einer weiteren Ausgestaltung der Erfindung ist es vorteilhaft, wenn die Druckleitung der Vorstufe in etwa auf Höhe der Hauptstufe oder oberhalb des Ansaugstutzens in einen Schwalltopf mündet. Dadurch wird gewährleistet, daß zum einen im Schwalltopf immer eine ausreichende Menge an Kraftstoff für die Hauptstufe zur Verfügung steht und daß zum anderen die Hauptstufe stets mit Kraftstoff gefüllt ist oder zumindestens beim Anlaufen augenblicklich Kraftstoff ansaugt und daher unverzüglich nach einem Start des Elektromotors Kraftstoff fördert.In a further embodiment of the invention, it is advantageous if the Pressure line of the preliminary stage approximately at the level of the main stage or above the Intake nozzle opens into a baffle. This ensures that on the one hand, there is always a sufficient amount of fuel in the surge pot for the Main level is available and that on the other hand the main level is always with Fuel is full or at least instant fuel at start-up draws in fuel and therefore immediately after starting the electric motor promotes.

Eine Ansaugung von in dem Schwalltopf vorhandenem, aufgeschäumten Kraftstoffschaum läßt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung weitgehend vermeiden, wenn die Hauptstufe eine außerhalb des Elektromotors bis in den Bodenbereich des Schwalltopfes geführte Saugleitung hat.Suction of foamed fuel foam present in the swirl pot can be according to another advantageous development of the invention largely avoid if the main stage is outside the electric motor has suction line led into the bottom area of the baffle.

Die erfindungsgemäße Kraftstoffpumpe läßt sich besonders einfach montieren, wenn die Hauptstufe an ihrer dem Elektromotor abgewandten Seite einen Flansch mit jeweils einem Anschlußstutzen für ihre Saugleitung und ihre Vorlaufleitung aufweist.The fuel pump according to the invention is particularly easy to install, if the main stage on its side facing away from the electric motor Flange with one connection piece each for your suction line and your flow line having.

In einer anderen Ausgestaltung ist die Druckleitung der Vorstufe vorteilhafterweise durch den Elektromotor geführt. Neben des besonders geringen baulichen Aufwandes zur Fertigung der erfindungsgemäßen Kraftstoffpumpe wird dadurch gleichzeitig eine Schmierung der Lagerstellen und Kühlung des Kohle-Kollektor-Systems ermöglicht. Entscheidend ist jedoch, daß der Kraftstoff dadurch erwärmte und zum Ausgasen neigende Kraftstoff durch die Förderung zu einem Bauteil wieder beruhigt wird, so daß über den Ansaugstutzen der Hauptstufe aus diesem Bauteil blasenfreier Kraftstoff angesaugt wird.In another embodiment, the pressure line of the preliminary stage is advantageously led by the electric motor. In addition to the particularly low structural Effort to manufacture the fuel pump according to the invention thereby lubricating the bearings and cooling the coal collector system at the same time allows. It is crucial, however, that the fuel warmed and outgassing fuel due to the delivery a component is reassured so that the intake manifold of the main stage Bubble-free fuel is drawn from this component.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips sind zwei davon in den Zeichnungen dargestellt und nachfolgend beschrieben. Diese zeigen in

Fig. 1:
einen Längsschnitt durch eine Kraftstoffpumpe,
Fig. 2:
einen Längsschnitt durch eine andere Ausführung einer Kraftstoffpumpe.
The invention allows numerous embodiments. To further clarify its basic principle, two of them are shown in the drawings and described below. These show in
Fig. 1:
a longitudinal section through a fuel pump,
Fig. 2:
a longitudinal section through another embodiment of a fuel pump.

In Figur 1 ist in einem nahe eines Bodens eines Kraftstoffbehälters 1 angeordneten Schwalltopfs 2 montierte Kraftstoffpumpe 3 angeordnet. Die Kraftstoffpumpe 3 hat ein aus Aluminium oder Stahl gefertigtes Gehäuse 4 mit einem darin angeordneten Elektromotor 5. Der Elektromotor 5 dient zum Antrieb einer Vorstufe 6 und einer Hauptstufe 7. Die Vorstufe 6 ist nahe eines Bodens des Schwalltopfes 2 angeordnet, während sich die Hauptstufe 7 auf der gegenüberliegenden Seite des Elektromotors 5 befindet. Der Schwalltopf 2 hat in seinem Bodenbereich eine Öffnung 8, in die die Kraftstoffpumpe 3 abdichtend eingesetzt ist. Unterhalb des Schwalltopfes 2 und in dessen oberen Bereich befindet sich jeweils ein Kraftstoffilter 9, 10. Durch den oberen Kraftstoffilter 10 kann bei ausreichend hohem Füllstand an Kraftstoff im Kraftstoffbehälter 1 Kraftstoff in den Schwalltopf 2 hineinströmen. Zur Verdeutlichung sind die Strömungen des Kraftstoffs in der Zeichnung mit Pfeilen gekennzeichnet. Die Vorstufe 6 und die Hauptstufe 7 sind als Seitenkanalpumpen ausgebildet und weisen jeweils ein auf einer Welle 11 des Elektromotors 5 befestigtes Laufrad 12, 13 auf.
Die Vorstufe 6 ist über eine Saugleitung 14 mit dem unterhalb des Schwalltopfes 2 angeordneten Kraftstoffilter 9 und über eine Druckleitung 15 mit dem Schwalltopf 2 verbunden. Bei einem Antrieb der Vorstufe 6 durch den Elektromotor 5 saugt die Vorstufe 6 damit Kraftstoff aus dem Kraftstoffbehälter 1 an und fördert diesen in den Schwalltopf 2. Die Druckleitung 15 ist hierbei durch den Elektromotor 5 geführt und endet in Höhe der Hauptstufe 7.
Die Hauptstufe 7 hat auf ihrer dem Elektromotor 5 abgewandten Seite einen Druckstutzen 16 für eine Vorlaufleitung 17 und einen am Umfang der Kraftstoffpumpe 3 angeordneten Ansaugstutzen 18 für eine Saugleitung 19. Die Saugleitung 19 ist bis in den Bodenbereich des Schwalltopfes 2 geführt und saugt von dort den Kraftstoff an. Die Vorlaufleitung ist innerhalb des Kraftstoffbehälters 1 nach oben geführt. Über die Vorlaufleitung 17 geförderter Kraftstoff gelangt zu einer nicht dargestellten Brennkraftmaschine des Kraftfahrzeuges. Nicht benötigter Kraftstoff wird über einen Rücklauf 20 in den Schwalltopf 2 geleitet. Dieser Kraftstoff wird über die Saugleitung 19 von der Hauptstufe 7 ohne nochmaliges Durchströmen des Elektromotors 5 wieder zur Brennkraftmaschine gefördert.In FIG. 1, a fuel pump 3 is arranged in a swirl pot 2 arranged near a bottom of a fuel tank 1. The fuel pump 3 has a housing 4 made of aluminum or steel with an electric motor 5 arranged therein. The electric motor 5 serves to drive a preliminary stage 6 and a main stage 7. The preliminary stage 6 is arranged near a bottom of the baffle 2, while the main stage 7 is located on the opposite side of the electric motor 5. The baffle 2 has an opening 8 in its bottom region, into which the fuel pump 3 is inserted in a sealing manner. A fuel filter 9, 10 is located below the surge pot 2 and in the upper region thereof. Fuel can flow into the surge pot 2 through the upper fuel filter 10 when the level of fuel in the fuel tank 1 is sufficiently high. For clarity, the flows of the fuel are marked with arrows in the drawing. The preliminary stage 6 and the main stage 7 are designed as side channel pumps and each have an impeller 12, 13 fastened to a shaft 11 of the electric motor 5.
The preliminary stage 6 is connected via a suction line 14 to the fuel filter 9 arranged below the swirl pot 2 and via a pressure line 15 to the swirl pot 2. When the preliminary stage 6 is driven by the electric motor 5, the preliminary stage 6 thus sucks fuel from the fuel tank 1 and conveys it into the surge pot 2. The pressure line 15 is guided through the electric motor 5 and ends at the level of the main stage 7.
The main stage 7 has, on its side facing away from the electric motor 5, a pressure connection 16 for a feed line 17 and a suction connection 18 arranged on the circumference of the fuel pump 3 for a suction line 19. The suction line 19 is led into the bottom region of the surge pot 2 and sucks the from there Fuel. The flow line is led upwards within the fuel tank 1. Fuel delivered via the feed line 17 reaches an internal combustion engine (not shown) of the motor vehicle. Fuel that is not required is fed into the surge pot 2 via a return 20. This fuel is conveyed via the suction line 19 from the main stage 7 to the internal combustion engine again without flowing through the electric motor 5 again.

Figur 2 zeigt eine im Aufbau veränderte Ausführung der erfindungsgemäßen Kraftstoffpumpe 3. Die Kraftstoffpumpe 3 ist in einem Kraftstoffbehälter 1 angeordnet. Die Druckleitung 15 der Vorstufe 6 ist durch den Elektromotor 5 bis zu einem Kraftstoff-Feinfilter 21 geführt. Die Hauptstufe 7 ist eine Gerotorpumpe. Auf der dem Elektromotor 5 abgewandten Seite der Hauptstufe 7 sind die Stutzen 16, 18 für die Saugleitung 19 und die Vorlaufleitung 17 angeordnet. Von dort wird der Kraftstoff durch den Ansaugstutzen 18 von der Hauptstufe 7 angesaugt und über die Vorlaufleitung 17 weiter zur Brennkraftmaschine gefördert. Nicht benötigter Kraftstoff wird über einen Rücklauf 20 in den Kraftstoffbehälter 1 geleitet.FIG. 2 shows an embodiment of the inventive design that has changed in construction Fuel pump 3. The fuel pump 3 is arranged in a fuel tank 1. The pressure line 15 of the preliminary stage 6 is through the electric motor 5 to led to a fuel fine filter 21. The main stage 7 is a gerotor pump. On the side of the main stage 7 facing away from the electric motor 5 are the Sockets 16, 18 for the suction line 19 and the flow line 17 are arranged. From there, the fuel is discharged from the main stage 7 through the intake port 18 sucked in and conveyed further to the internal combustion engine via the feed line 17. Fuel that is not required is fed into the fuel tank via a return 20 1 headed.

Claims (7)

  1. Fuel pump for a motor vehicle, having a preliminary stage (6) delivering into a component, preferably a surge chamber (2) or a filter, having a main stage (7) for delivering fuel via a forward-flow line (17) to an internal combustion engine and an electric motor (5) for driving the preliminary stage and main stage (6, 7), the main stage (7) being arranged directly upstream of the forward-flow line (17) to the internal combustion engine, characterized in that the main stage (7) sucks in fuel directly from the component (2, 21), and in that the component (2, 21) is independent of a housing (4) accommodating the electric motor (5).
  2. Fuel pump according to Claim 1, characterized in that the main stage (7) is arranged on a side of the electric motor (5) which lies opposite the preliminary stage (6).
  3. Fuel pump according to either of Claims 1 and 2, characterized in that a discharge line (15) of the preliminary stage (6) opens into the surge chamber (2) in the region of the main stage (7).
  4. Fuel pump according to Claim 3, characterized in that the discharge line (15) of the preliminary stage (6) opens into the surge chamber (2) above the suction branch (18) of the main stage (7).
  5. Fuel pump according to at least one of Claims 1 to 4, characterized in that the main stage (7) has a suction line (19) which is guided outside the electric motor (5) into the bottom region of the surge chamber (2).
  6. Fuel pump according to at least one of Claims 1 to 5, characterized in that a discharge branch (16) and a suction branch (18) are arranged on the main stage (7), on its side facing away from the electric motor (5), preferably on a flange.
  7. Fuel pump according to at least one of Claims 1 to 6, characterized in that the discharge line (15) of the preliminary stage (6) is guided through the electric motor (5).
EP01984705A 2000-12-14 2001-12-13 Fuel pump for a motor vehicle Expired - Lifetime EP1342002B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10062452 2000-12-14
DE10062452A DE10062452A1 (en) 2000-12-14 2000-12-14 Fuel pump for a motor vehicle
PCT/DE2001/004674 WO2002048535A1 (en) 2000-12-14 2001-12-13 Fuel pump for a motor vehicle

Publications (2)

Publication Number Publication Date
EP1342002A1 EP1342002A1 (en) 2003-09-10
EP1342002B1 true EP1342002B1 (en) 2004-06-09

Family

ID=7667222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01984705A Expired - Lifetime EP1342002B1 (en) 2000-12-14 2001-12-13 Fuel pump for a motor vehicle

Country Status (9)

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US (1) US20040052654A1 (en)
EP (1) EP1342002B1 (en)
JP (1) JP2004515705A (en)
KR (1) KR20030068554A (en)
CN (1) CN1481473A (en)
BR (1) BR0116137A (en)
DE (2) DE10062452A1 (en)
ES (1) ES2223009T3 (en)
WO (1) WO2002048535A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4875398B2 (en) * 2006-04-21 2012-02-15 株式会社ケーヒン Fuel supply module
KR100974309B1 (en) * 2008-08-22 2010-08-05 김명숙 Cigar jack
WO2014020865A1 (en) * 2012-07-31 2014-02-06 トヨタ自動車株式会社 Fuel vapor processing apparatus
US9200603B2 (en) * 2013-02-11 2015-12-01 Coachman Performance, Llc Anti-surge tank housed within a fuel vessel
DE102016217800B4 (en) * 2016-09-16 2021-12-23 Vitesco Technologies GmbH Fluid delivery device

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US3094272A (en) * 1960-12-09 1963-06-18 Trane Co Motor-compressor apparatus
JPS5971984U (en) * 1982-11-06 1984-05-16 三菱電機株式会社 pump equipment
DE9104511U1 (en) * 1991-04-13 1992-08-13 Robert Bosch Gmbh, 7000 Stuttgart, De
US5111844A (en) * 1991-10-28 1992-05-12 General Motors Corporation Automotive fuel system
US6012904A (en) * 1994-05-17 2000-01-11 Walbro Corporation Vented fuel module reservoir with two-stage pump
DE4425670C2 (en) * 1994-07-20 2000-08-24 Mannesmann Vdo Ag Fuel supply unit for a motor vehicle with a diesel engine
DE19530421A1 (en) * 1995-08-18 1997-02-20 Vdo Schindling Conveyor unit
US5809975A (en) * 1996-05-06 1998-09-22 Walbro Corporation In tank fuel pump and reservoir with stand pipe
DE19627581A1 (en) * 1996-07-09 1998-01-15 Pierburg Ag Arrangement of a fuel pump
JP2001221199A (en) * 2000-02-08 2001-08-17 Toshiba Tec Corp Electrically driven pump
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US6397822B1 (en) * 2000-04-18 2002-06-04 Uis, Inc. Integrated fuel system unit with two-stage marine fuel pump

Also Published As

Publication number Publication date
BR0116137A (en) 2003-10-21
CN1481473A (en) 2004-03-10
DE50102559D1 (en) 2004-07-15
WO2002048535A1 (en) 2002-06-20
KR20030068554A (en) 2003-08-21
JP2004515705A (en) 2004-05-27
EP1342002A1 (en) 2003-09-10
US20040052654A1 (en) 2004-03-18
ES2223009T3 (en) 2005-02-16
DE10062452A1 (en) 2002-06-20

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