EP1022457A2 - Fuel feed device - Google Patents

Fuel feed device Download PDF

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Publication number
EP1022457A2
EP1022457A2 EP00100871A EP00100871A EP1022457A2 EP 1022457 A2 EP1022457 A2 EP 1022457A2 EP 00100871 A EP00100871 A EP 00100871A EP 00100871 A EP00100871 A EP 00100871A EP 1022457 A2 EP1022457 A2 EP 1022457A2
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EP
European Patent Office
Prior art keywords
stage
fuel
preliminary stage
delivery unit
unit according
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.)
Granted
Application number
EP00100871A
Other languages
German (de)
French (fr)
Other versions
EP1022457B1 (en
EP1022457A3 (en
Inventor
Peter Marx
Christoph Schmidt
Hans-Dieter Wilhelm
Thomas Werner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Mannesmann VDO AG
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Application filed by Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP1022457A2 publication Critical patent/EP1022457A2/en
Publication of EP1022457A3 publication Critical patent/EP1022457A3/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
    • 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
    • F02M37/20—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 characterised by means for preventing vapour lock
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86187—Plural tanks or compartments connected for serial flow
    • Y10T137/86228—With communicating opening in common walls of tanks or compartments

Definitions

  • the invention relates to a fuel delivery unit for a motor vehicle with a for mounting in a fuel tank provided a preliminary and a main level having fuel pump, with one for filling provided by the pre-stage surge to collect of fuel for the intake from the swirl pot Main stage, with the preliminary stage and the main stage of a vertical shaft can be driven.
  • the preliminary stage and the main stage of the fuel pump are in the known fuel delivery unit designed as peripheral pumps and point to the vertical Shaft attached impellers.
  • the vertical wave is a motor shaft one also in the baffle arranged electric motor.
  • the preliminary stage is usually below arranged in the main stage and fills the baffle via a riser pipe.
  • the main stage sucks from the Baffle and creates one for an internal combustion engine of the motor vehicle necessary pressure.
  • the fuel delivery unit is very compact.
  • a disadvantage of the known fuel delivery unit is that it has very large dimensions and that the wheels the feed pump very high in the fuel feed unit are arranged. This is in the fuel tank and a very high one in the surge pot Level of fuel required so that Can promote fuel delivery unit. Especially with one Cornering of the fuel tank or when hot There is fuel in the fuel tank even at a very high level Fuel tank the risk that the precursor air or Fuel vapors suck in and foam with the fuel generated and promoted in the surge pot.
  • the invention is based on the problem of a fuel delivery unit of the type mentioned at the beginning that it is particularly compact and that the impellers of the feed pump are arranged as low as possible are.
  • the preliminary stage has a radially outward pointing and has an upwardly increasing outlet channel.
  • This design allows existing prepress Gas bubbles discharged very easily through its outlet channel become.
  • the outlet channel can be in outside of the feed pump the vertical riser of the known fuel delivery unit be redirected.
  • An existing one in the riser Liquid column can go up because of the rising outlet channel the escape of the gas bubbles do not interfere.
  • the impellers of the preliminary stage and the main level very close together and together Place very close to the bottom of the fuel tank. This is for the operation of the invention Fuel delivery unit a particularly low level required in the fuel tank.
  • the invention Fuel delivery unit is also special compact.
  • Fuel delivery unit helps when the Main stage a vertical one, from a delivery chamber of the Main stage led to the bottom area of the baffle Has inlet duct.
  • Another advantage of this design is that the feed pump, aside of the deflection on the riser pipe, straight inlet channels and Has outlet channels. This increases the risk of evaporation kept particularly low by hot fuel.
  • the feed pump is advantageous according to another Further development of the invention is structurally simple, if the outlet channel of the preliminary stage differs from its Delivery chamber from constantly expanding.
  • the preliminary stage could, for example, be a peripheral pump with blade chambers arranged in the circumference of the impeller be designed. However, this is an exact setting of the impeller on an axial play of the feed pump is required.
  • Such an attitude can be according to one other advantageous development of the invention simply avoid if the preliminary stage is designed as a side channel pump and the delivery chamber only in one of their End faces is arranged. Hereby rule on the End faces of the impeller of the preliminary stage are different Press so that the impeller is to the side of the lesser Pressure is pressed. This effect is also caused by a Leakage from the main stage on the shaft to the preliminary stage overflowing fuel supported.
  • the feed pump can be advantageous according to another Further development of the invention is particularly inexpensive manufacture if the impeller of the preliminary stage together with a part of a delivery chamber housing part the fuel pump as a thrust bearing for the fuel pump and one driving the fuel pump Electric motor is designed.
  • the impeller and the housing part can for example to form the thrust bearing have a lubricious coating or pockets for Have generation of a sliding film from fuel.
  • Heating the fuel in the preliminary stage can be according to another advantageous one Avoid further development of the invention if a housing wall between the pre-stage and the main stage from one heat insulating material is made. This will the risk of fuel evaporating in the intake port the preliminary stage was kept particularly low.
  • a swirl of the fuel drawn in by the preliminary stage can be according to another advantageous development avoid the invention particularly reliably, if the baffle is one in the center of its base area Recess for the intake of fuel through the preliminary stage has and if an inlet channel of the preliminary stage is vertical the impeller of the preliminary stage is arranged tapered. Farther this creates the inventive Fuel delivery unit particularly compact.
  • the invention Conveyor unit is also easy to manufacture and assemble.
  • FIG. 1 shows schematically an inventive, in a fuel tank 1 mounted fuel delivery unit 2 in longitudinal section.
  • the fuel delivery unit 2 has a flange 3 and a swirl pot 4.
  • the flange 3 serves for fastening in a recess 5 of an upper one Wall 6 of the fuel tank 1.
  • the surge pot 4 is biased against a bottom 7 of the fuel tank 1.
  • In the surge pot 4 is one of an electric motor 8 driven feed pump 9 with a preliminary stage 10 and a main stage 11.
  • Prepress 10 serves to deliver fuel from the fuel tank 1 into the baffle 4.
  • the main stage 11 sucks Fuel from the surge pot 4 and promotes this one on the outside of the flange 3 of the fuel delivery unit 2 arranged connecting piece 12.
  • connection piece 12 can be one of a not shown Connect the flow line leading the internal combustion engine. Furthermore, the flange 3 has a connection piece 13 for a likewise not shown, of the Internal combustion engine returned to the fuel tank 1 Return line. Backflowing fuel arrives either directly into the surge pot 4 or initially to a fuel tank, also not shown 1 mounted suction jet pump. The suction jet pump then pumps fuel into the Swirl pot 4.
  • the preliminary stage 10 and the main stage 11 are each as Side channel pumps are designed and each have one a shaft 14 mounted impeller 15, 16.
  • In the shaft 14 is a motor shaft of the electric motor.
  • the precursor 10 has one of the bottom area of the fuel tank 1 taper perpendicular to the impeller 15 Inlet channel 17.
  • An outlet channel 18 of the preliminary stage 10 has radially outwards and rises upwards. Then the outlet channel 18 opens into an open at the top Riser 19.
  • One from the inlet duct 17 to the outlet duct 18 guided delivery chamber 20 is exclusive on the side of the impeller facing away from the main stage 11 15 arranged.
  • the delivery chamber 20 is each for Half in the impeller 15 and one opposite the impeller 15 Housing part 21.
  • the housing part 21 and that Impeller 15 form an axial bearing for the feed pump 9 and the electric motor 8.
  • the main stage 11 has two that Impeller 16 opposite housing parts 22, 23 with a through the impeller 16 from an inlet channel 24 to one Outlet channel 25 guided delivery chamber 26.
  • In the lower Housing part 23 is the inlet channel 24 of the main stage 11 arranged, while in the upper housing part 22nd the outlet channel 25 is located.
  • the cross-sectional area of the Delivery chamber 20 of precursor 10 has approximately twice as much large dimensions such as the cross-sectional area of the delivery chamber 26 of the main level 11.
  • FIG 2 shows a sectional view through the Feed pump 9 of Figure 1 along the line II - II that the impeller 15 of the preliminary stage 10 has a plurality of vane chambers 27 Has.
  • the blade chambers 27 are each of guide vanes 28 limited. Generate when the impeller 15 rotates the guide vanes 28 a circulation flow in the delivery chamber 20.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The priming stage (10) has an outlet duct (18) pointing radially outwards and rising upwards. The main stage (11) has a vertical inlet duct (24), led from a delivery chamber (26) of the main stage (11) up to the base region of the surge vessel (4). The outlet duct (18) of the priming stage (10) is continuously widened from the delivery chamber (20).

Description

Die Erfindung betrifft eine Kraftstoffördereinheit für ein Kraftfahrzeug mit einer zur Montage in einem Kraftstoffbehälter vorgesehenen, eine Vorstufe und eine Hauptstufe aufweisenden Kraftstoffpumpe, mit einem zur Befüllung durch die Vorstufe vorgesehenen Schwalltopt zum Sammeln von Kraftstoff für die aus dem Schwalltopf ansaugende Hauptstufe, wobei die Vorstufe und die Hauptstufe von einer vertikalen Welle antreibbar sind.The invention relates to a fuel delivery unit for a motor vehicle with a for mounting in a fuel tank provided a preliminary and a main level having fuel pump, with one for filling provided by the pre-stage surge to collect of fuel for the intake from the swirl pot Main stage, with the preliminary stage and the main stage of a vertical shaft can be driven.

Solche Kraftstoffördereinheiten werden in heutigen Kraftfahrzeugen häufig eingesetzt und sind aus der Praxis bekannt. Die Vorstufe und die Hauptstufe der Kraftstoffpumpe sind bei der bekannten Kraftstoffördereinheit jeweils als Peripheralpumpen gestaltet und weisen auf der vertikalen Welle befestigte Laufräder auf. Die vertikale Welle ist eine Motorwelle eines ebenfalls in dem Schwalltopf angeordneten Elektromotors. Die Vorstufe ist meist unterhalb der Hauptstufe angeordnet und befüllt den Schwalltopf über ein Steigrohr. Die Hauptstufe saugt aus dem Schwalltopf an und erzeugt einen für eine Brennkraftmaschine des Kraftfahrzeuges notwendigen Druck. Hierdurch gestaltet sich die Kraftstoffördereinheit sehr kompakt.Such fuel delivery units are used in today's motor vehicles frequently used and are known from practice. The preliminary stage and the main stage of the fuel pump are in the known fuel delivery unit designed as peripheral pumps and point to the vertical Shaft attached impellers. The vertical wave is a motor shaft one also in the baffle arranged electric motor. The preliminary stage is usually below arranged in the main stage and fills the baffle via a riser pipe. The main stage sucks from the Baffle and creates one for an internal combustion engine of the motor vehicle necessary pressure. Hereby the fuel delivery unit is very compact.

Nachteilig bei der bekannten Kraftstoffördereinheit ist, daß sie sehr große Abmessungen aufweist und daß die Laufräder der Förderpumpe sehr hoch in der Kraftstoffördereinheit angeordnet sind. Hierdurch ist in dem Kraftstoffbehälter und in dem Schwalltopf jeweils ein sehr hoher Füllstand an Kraftstoff erforderlich, damit die Kraftstoffördereinheit fördern kann. Insbesondere bei einer Kurvenfahrt des Kraftstoffbehälters oder bei heißem Kraftstoff besteht auch bei einem sehr hohen Füllstand im Kraftstoffbehälter die Gefahr, daß die Vorstufe Luft oder Kraftstoffdämpfe ansaugt und mit dem Kraftstoff Schaum erzeugt und in den Schwalltopf fördert.A disadvantage of the known fuel delivery unit is that it has very large dimensions and that the wheels the feed pump very high in the fuel feed unit are arranged. This is in the fuel tank and a very high one in the surge pot Level of fuel required so that Can promote fuel delivery unit. Especially with one Cornering of the fuel tank or when hot There is fuel in the fuel tank even at a very high level Fuel tank the risk that the precursor air or Fuel vapors suck in and foam with the fuel generated and promoted in the surge pot.

Der Erfindung liegt das Problem zugrunde, eine Kraftstoffördereinheit der eingangs genannten Art so zu gestalten, daß sie besonders kompakt aufgebaut ist und daß die Laufräder der Förderpumpe möglichst niedrig angeordnet sind.The invention is based on the problem of a fuel delivery unit of the type mentioned at the beginning that it is particularly compact and that the impellers of the feed pump are arranged as low as possible are.

Dieses Problem wird erfindungsgemäß dadurch gelöst, daß die Vorstufe einen radial nach außen hin weisenden und nach oben hin ansteigenden Auslaßkanal hat.This problem is solved according to the invention in that the preliminary stage has a radially outward pointing and has an upwardly increasing outlet channel.

Durch diese Gestaltung können in der Vorstufe vorhandene Gasblasen sehr einfach über dessen Auslaßkanal abgeführt werden. Der Auslaßkanal kann außerhalb der Förderpumpe in das senkrechte Steigrohr der bekannten Kraftstoffördereinheit umgelenkt werden. Eine in dem Steigrohr vorhandene Flüssigkeitssäule kann wegen des nach oben hin ansteigenden Auslaßkanals das Entweichen der Gasblasen nicht beeinträchtigen. Da der Auslaßkanal der Vorstufe radial geführt ist, lassen sich die Laufräder der Vorstufe und der Hauptstufe sehr nahe beisammen und gemeinsam sehr nahe an dem Bodenbereich des Kraftstoffbehälters anordnen. Hierdurch ist für den Betrieb der erfindungsgemäßen Kraftstoffördereinheit ein besonders geringer Füllstand im Kraftstoffbehälter erforderlich. Die erfindungsgemäße Kraftstoffördereinheit gestaltet sich zudem besonders kompakt.This design allows existing prepress Gas bubbles discharged very easily through its outlet channel become. The outlet channel can be in outside of the feed pump the vertical riser of the known fuel delivery unit be redirected. An existing one in the riser Liquid column can go up because of the rising outlet channel the escape of the gas bubbles do not interfere. Because the outlet channel of the preliminary stage is guided radially, the impellers of the preliminary stage and the main level very close together and together Place very close to the bottom of the fuel tank. This is for the operation of the invention Fuel delivery unit a particularly low level required in the fuel tank. The invention Fuel delivery unit is also special compact.

Zur weiteren Verringerung der Abmessungen der erfindungsgemäßen Kraftstoffördereinheit trägt es bei, wenn die Hauptstufe einen vertikalen, von einer Förderkammer der Hauptstufe bis zu dem Bodenbereich des Schwalltopfes geführten Einlaßkanal hat. Ein weiterer Vorteil dieser Gestaltung besteht darin, daß die Förderpumpe, abgesehen von der Umlenkung am Steigrohr, gerade Einlaßkanäle und Auslaßkanäle hat. Hierdurch wird die Gefahr eines Verdampfens von heißem Kraftstoff besonders gering gehalten.To further reduce the dimensions of the invention Fuel delivery unit helps when the Main stage a vertical one, from a delivery chamber of the Main stage led to the bottom area of the baffle Has inlet duct. Another advantage of this design is that the feed pump, aside of the deflection on the riser pipe, straight inlet channels and Has outlet channels. This increases the risk of evaporation kept particularly low by hot fuel.

Die Förderpumpe ist gemäß einer anderen vorteilhaften Weiterbildung der Erfindung konstruktiv einfach aufgebaut, wenn sich der Auslaßkanal der Vorstufe von deren Förderkammer aus stetig erweitert.The feed pump is advantageous according to another Further development of the invention is structurally simple, if the outlet channel of the preliminary stage differs from its Delivery chamber from constantly expanding.

Die Vorstufe könnte beispielsweise als Peripheralpumpe mit im Umfang des Laufrades angeordneten Schaufelkammern gestaltet sein. Hierdurch ist jedoch eine genaue Einstellung des Laufrades auf ein Axialspiel der Förderpumpe erforderlich. Eine solche Einstellung läßt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung einfach vermeiden, wenn die Vorstufe als Seitenkanalpumpe ausgebildet und die Förderkammer ausschließlich in einer ihrer Stirnseiten angeordnet ist. Hierdurch herrschen auf den Stirnseiten des Laufrades der Vorstufe unterschiedliche Drücke, so daß das Laufrad zu der Seite des geringeren Drucks gedrückt wird. Dieser Effekt wird zudem durch eine Leckage von aus der Hauptstufe an der Welle zu der Vorstufe überströmendem Kraftstoff unterstützt. The preliminary stage could, for example, be a peripheral pump with blade chambers arranged in the circumference of the impeller be designed. However, this is an exact setting of the impeller on an axial play of the feed pump is required. Such an attitude can be according to one other advantageous development of the invention simply avoid if the preliminary stage is designed as a side channel pump and the delivery chamber only in one of their End faces is arranged. Hereby rule on the End faces of the impeller of the preliminary stage are different Press so that the impeller is to the side of the lesser Pressure is pressed. This effect is also caused by a Leakage from the main stage on the shaft to the preliminary stage overflowing fuel supported.

Die Förderpumpe läßt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung besonders kostengünstig fertigen, wenn das Laufrad der Vorstufe zusammen mit einem einen Teil einer Förderkammer aufweisenden Gehäuseteil der Kraftstoffpumpe als Axiallager für die Kraftstoffpumpe und einem die Kraftstoffpumpe antreibenden Elektromotor gestaltet ist. Das Laufrad und das Gehäuseteil können zur Bildung des Axiallagers beispielsweise eine gleitfähige Beschichtung aufweisen oder Taschen zur Erzeugung eines Gleitfilms aus Kraftstoff aufweisen.The feed pump can be advantageous according to another Further development of the invention is particularly inexpensive manufacture if the impeller of the preliminary stage together with a part of a delivery chamber housing part the fuel pump as a thrust bearing for the fuel pump and one driving the fuel pump Electric motor is designed. The impeller and the housing part can for example to form the thrust bearing have a lubricious coating or pockets for Have generation of a sliding film from fuel.

Meist wird von der Brennkraftmaschine des Kraftfahrzeuges in den Kraftstoffbehälter zurückfließender Kraftstoff dem Schwalltopf zugeführt. Eine Aufheizung des Kraftstoffs in der Vorstufe läßt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung vermeiden, wenn eine Gehäusewand zwischen der Vorstufe und der Hauptstufe aus einem wärmeisolierenden Material gefertigt ist. Hierdurch wird die Gefahr eines Verdampfens des Kraftstoffs in dem Einlaßkanal der Vorstufe besonders gering gehalten.Mostly of the internal combustion engine of the motor vehicle fuel flowing back into the fuel tank Swirl pot fed. Heating the fuel in the preliminary stage can be according to another advantageous one Avoid further development of the invention if a housing wall between the pre-stage and the main stage from one heat insulating material is made. This will the risk of fuel evaporating in the intake port the preliminary stage was kept particularly low.

Zur weiteren Verringerung der Wärmeübertragung von der Hauptstufe auf die Vorstufe trägt es gemäß einer anderen vorteilhaften Weiterbildung der Erfindung bei, wenn Schaufelkammern der Vorstufe an der der Hauptstufe abgewandten Stirnseite angeordnet sind.To further reduce heat transfer from the It carries the main level to the preliminary stage according to another advantageous development of the invention when Blade chambers of the preliminary stage facing away from the main stage Are arranged.

Eine Verwirbelung des von der Vorstufe angesaugten Kraftstoffs läßt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung besonders zuverlässig vermeiden, wenn der Schwalltopf im Zentrum seines Bodenbereichs eine Ausnehmung zur Ansaugung von Kraftstoff durch die Vorstufe hat und wenn ein Einlaßkanal der Vorstufe vertikal auf das Laufrad der Vorstufe zulaufend angeordnet ist. Weiterhin gestaltet sich hierdurch die erfindungsgemäße Kraftstoffördereinheit besonders kompakt. Die erfindungsgemäße Fördereinheit läßt sich zudem einfach herstellen und montieren.A swirl of the fuel drawn in by the preliminary stage can be according to another advantageous development avoid the invention particularly reliably, if the baffle is one in the center of its base area Recess for the intake of fuel through the preliminary stage has and if an inlet channel of the preliminary stage is vertical the impeller of the preliminary stage is arranged tapered. Farther this creates the inventive Fuel delivery unit particularly compact. The invention Conveyor unit is also easy to manufacture and assemble.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips ist eine davon in der Zeichnung dargestellt und wird nachfolgend beschrieben. Diese zeigt in

Fig.1
eine schematische Darstellung einer erfindungsgemäßen Kraftstoffördereinheit in einem Längs schnitt
Fig.2
eine Schnittdarstellung durch eine Vorstufe der Kraftstoffördereinheit aus Figur 1 entlang der Linie II - II.
The invention permits numerous embodiments. To further clarify its basic principle, one of these is shown in the drawing and is described below. This shows in
Fig. 1
a schematic representation of a fuel delivery unit according to the invention in a longitudinal section
Fig. 2
a sectional view through a preliminary stage of the fuel delivery unit of Figure 1 along the line II - II.

Die Figur 1 zeigt schematisch eine erfindungsgemäße, in einem Kraftstoffbehälter 1 montierte Kraftstoffördereinheit 2 im Längsschnitt. Die Kraftstoffördereinheit 2 hat einen Flansch 3 und einen Schwalltopf 4. Der Flansch 3 dient zur Befestigung in einer Ausnehmung 5 einer oberen Wandung 6 des Kraftstoffbehälters 1. Der Schwalltopf 4 ist gegen einen Boden 7 des Kraftstoffbehälters 1 vorgespannt. In dem Schwalltopf 4 ist eine von einem Elektromotor 8 angetriebene Förderpumpe 9 mit einer Vorstufe 10 und einer Hauptstufe 11 angeordnet. Zur Vereinfachung der Zeichnung sind der Elektromotor 8 und der Schwalltopf 4 nur teilweise geschnitten dargestellt. Die Vorstufe 10 dient zur Förderung von Kraftstoff aus dem Kraftstoffbehälter 1 in den Schwalltopf 4. Die Hauptstufe 11 saugt Kraftstoff aus dem Schwalltopf 4 an und fördert diesen zu einem an der Außenseite des Flansches 3 der Kraftstoffördereinheit 2 angeordneten Anschlußstutzen 12. An dem Anschlußstutzen 12 läßt sich eine zu einer nicht dargestellten Brennkraftmaschine führende Vorlaufleitung anschließen. Weiterhin hat der Flansch 3 einen Anschlußstutzen 13 für eine ebenfalls nicht dargestellte, von der Brennkraftmaschine in den Kraftstoffbehälter 1 zurückgeführte Rücklaufleitung. Zurückfließender Kraftstoff gelangt entweder unmittelbar in den Schwalltopf 4 oder zunächst zu einer ebenfalls nicht dargestellten, im Kraftstoffbehälter 1 montierten Saugstrahlpumpe. Die Saugstrahlpumpe fördert anschließend Kraftstoff in den Schwalltopf 4.Figure 1 shows schematically an inventive, in a fuel tank 1 mounted fuel delivery unit 2 in longitudinal section. The fuel delivery unit 2 has a flange 3 and a swirl pot 4. The flange 3 serves for fastening in a recess 5 of an upper one Wall 6 of the fuel tank 1. The surge pot 4 is biased against a bottom 7 of the fuel tank 1. In the surge pot 4 is one of an electric motor 8 driven feed pump 9 with a preliminary stage 10 and a main stage 11. To simplify the Drawing are the electric motor 8 and the baffle 4th shown only partially cut. Prepress 10 serves to deliver fuel from the fuel tank 1 into the baffle 4. The main stage 11 sucks Fuel from the surge pot 4 and promotes this one on the outside of the flange 3 of the fuel delivery unit 2 arranged connecting piece 12. On the connecting piece 12 can be one of a not shown Connect the flow line leading the internal combustion engine. Furthermore, the flange 3 has a connection piece 13 for a likewise not shown, of the Internal combustion engine returned to the fuel tank 1 Return line. Backflowing fuel arrives either directly into the surge pot 4 or initially to a fuel tank, also not shown 1 mounted suction jet pump. The suction jet pump then pumps fuel into the Swirl pot 4.

Die Vorstufe 10 und die Hauptstufe 11 sind jeweils als Seitenkanalpumpen ausgebildet und haben jeweils ein auf einer Welle 14 montiertes Laufrad 15, 16. Bei der Welle 14 handelt es sich um eine Motorwelle des Elektromotors. Die Vorstufe 10 hat einen von dem Bodenbereich des Kraftstoffbehälters 1 senkrecht auf das Laufrad 15 zulaufenden Einlaßkanal 17. Ein Auslaßkanal 18 der Vorstufe 10 weist radial nach außen hin weg und steigt nach oben hin an. Anschließend mündet der Auslaßkanal 18 in ein oben offenes Steigrohr 19. Eine von dem Einlaßkanal 17 zu dem Auslaßkanal 18 geführte Förderkammer 20 ist ausschließlich auf der der Hauptstufe 11 abgewandten Seite des Laufrades 15 angeordnet. Die Förderkammer 20 befindet sich je zur Hälfte in dem Laufrad 15 und einem dem Laufrad 15 gegenüberstehenden Gehäuseteil 21. Das Gehäuseteil 21 und das Laufrad 15 bilden ein Axiallager für die Förderpumpe 9 und den Elektromotor 8. Die Hauptstufe 11 hat zwei dem Laufrad 16 gegenüberstehende Gehäuseteile 22, 23 mit einer durch das Laufrad 16 von einem Einlaßkanal 24 zu einem Auslaßkanal 25 geführten Förderkammer 26. In dem unteren Gehäuseteil 23 ist der Einlaßkanal 24 der Hauptstufe 11 angeordnet, während sich im oberen Gehäuseteil 22 der Auslaßkanal 25 befindet. Die Querschnittsfläche der Förderkammer 20 der Vorstufe 10 hat ungefähr doppelt so große Abmessungen wie die Querschnittsfläche der Förderkammer 26 der Hauptstufe 11. The preliminary stage 10 and the main stage 11 are each as Side channel pumps are designed and each have one a shaft 14 mounted impeller 15, 16. In the shaft 14 is a motor shaft of the electric motor. The precursor 10 has one of the bottom area of the fuel tank 1 taper perpendicular to the impeller 15 Inlet channel 17. An outlet channel 18 of the preliminary stage 10 has radially outwards and rises upwards. Then the outlet channel 18 opens into an open at the top Riser 19. One from the inlet duct 17 to the outlet duct 18 guided delivery chamber 20 is exclusive on the side of the impeller facing away from the main stage 11 15 arranged. The delivery chamber 20 is each for Half in the impeller 15 and one opposite the impeller 15 Housing part 21. The housing part 21 and that Impeller 15 form an axial bearing for the feed pump 9 and the electric motor 8. The main stage 11 has two that Impeller 16 opposite housing parts 22, 23 with a through the impeller 16 from an inlet channel 24 to one Outlet channel 25 guided delivery chamber 26. In the lower Housing part 23 is the inlet channel 24 of the main stage 11 arranged, while in the upper housing part 22nd the outlet channel 25 is located. The cross-sectional area of the Delivery chamber 20 of precursor 10 has approximately twice as much large dimensions such as the cross-sectional area of the delivery chamber 26 of the main level 11.

Die Figur 2 zeigt in einer Schnittdarstellung durch die Förderpumpe 9 aus Figur 1 entlang der Linie II - II, daß das Laufrad 15 der Vorstufe 10 mehrere Schaufelkammern 27 hat. Die Schaufelkammern 27 sind jeweils von Leitschaufeln 28 begrenzt. Bei einer Drehung des Laufrades 15 erzeugen die Leitschaufeln 28 eine Zirkulationsströmung in der Förderkammer 20.Figure 2 shows a sectional view through the Feed pump 9 of Figure 1 along the line II - II that the impeller 15 of the preliminary stage 10 has a plurality of vane chambers 27 Has. The blade chambers 27 are each of guide vanes 28 limited. Generate when the impeller 15 rotates the guide vanes 28 a circulation flow in the delivery chamber 20.

Claims (8)

Kraftstoffördereinheit für ein Kraftfahrzeug mit einer zur Montage in einem Kraftstoffbehälter vorgesehenen, eine Vorstufe und eine Hauptstufe aufweisenden Kraftstoffpumpe, mit einem zur Befüllung durch die Vorstufe vorgesehenen Schwalltopf zum Sammeln von Kraftstoff für die aus dem Schwalltopf ansaugende Hauptstufe, wobei die Vorstufe und die Hauptstufe von einer vertikalen Welle antreibbar sind, dadurch gekennzeichnet, daß die Vorstufe (10) einen radial nach außen hin weisenden und nach oben hin ansteigenden Auslaßkanal (18) hat.Fuel delivery unit for a motor vehicle with a fuel pump provided for mounting in a fuel tank and having a preliminary stage and a main stage, with a baffle provided for filling by the preliminary stage for collecting fuel for the main stage sucking out of the baffle, the preliminary stage and the main stage being of a vertical shaft can be driven, characterized in that the preliminary stage (10) has a radially outwardly pointing and upwardly increasing outlet channel (18). Kraftstoffördereinheit nach Anspruch 1, dadurch gekennzeichnet, daß die Hauptstufe (11) einen vertikalen, von einer Förderkammer (26) der Hauptstufe (11) bis zu dem Bodenbereich des Schwalltopfes (4) geführten Einlaßkanal (24) hat.Fuel delivery unit according to Claim 1, characterized in that the main stage (11) has a vertical inlet channel (24) which leads from a delivery chamber (26) of the main stage (11) to the bottom region of the swirl pot (4). Kraftstoffördereinheit nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sich der Auslaßkanal (18) der Vorstufe (10) von deren Förderkammer (20) aus stetig erweitert.Fuel delivery unit according to claim 1 or 2, characterized in that the outlet channel (18) of the preliminary stage (10) continuously widens from its delivery chamber (20). Kraftstoffördereinheit nach zumindest einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Vorstufe (10) als Seitenkanalpumpe ausgebildet und die Förderkammer (20) ausschließlich in einer ihrer Stirnseiten angeordnet ist.Fuel delivery unit according to at least one of the preceding claims, characterized in that the preliminary stage (10) is designed as a side channel pump and the delivery chamber (20) is arranged exclusively in one of its end faces. Kraftstoffördereinheit nach zumindest einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Laufrad (15) der Vorstufe (10) zusammen mit einem einen Teil der Förderkammer (20) aufweisenden Gehäuseteil (21) der Förderpumpe (9) als Axiallager für die Förderpumpe (9) und einem die Förderpumpe (9) antreibenden Elektromotor (8) gestaltet ist.Fuel delivery unit according to at least one of the preceding claims, characterized in that the impeller (15) of the preliminary stage (10) together with a housing part (21) of the feed pump (9) having part of the feed chamber (20) as an axial bearing for the feed pump (9) and an electric motor (8) driving the feed pump (9) is designed. Kraftstoffördereinheit nach zumindest einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein Gehäuseteil (23) zwischen der Vorstufe (10) und der Hauptstufe (11) aus einem wärmeisolierenden Material gefertigt ist.Fuel delivery unit according to at least one of the preceding claims, characterized in that a housing part (23) between the preliminary stage (10) and the main stage (11) is made of a heat-insulating material. Kraftstoffördereinheit nach zumindest einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß Schaufelkammern (27) der Vorstufe (10) an der der Hauptstufe (11) abgewandten Stirnseite angeordnet sind.Fuel delivery unit according to at least one of the preceding claims, characterized in that blade chambers (27) of the preliminary stage (10) are arranged on the end face facing away from the main stage (11). Kraftstoffördereinheit nach zumindest einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Schwalltopf (4) im Zentrum seines Bodenbereichs eine Ausnehmung zur Ansaugung von Kraftstoff durch die Vorstufe (10) hat und daß ein Einlaßkanal (17) der Vorstufe (10) vertikal auf das Laufrad (15) der Vorstufe (10) zulaufend angeordnet ist.Fuel delivery unit according to at least one of the preceding claims, characterized in that the swirl pot (4) has a recess in the center of its base region for the suction of fuel through the preliminary stage (10) and that an inlet channel (17) of the preliminary stage (10) is vertical to the impeller (15) the preliminary stage (10) is arranged tapering.
EP20000100871 1999-01-22 2000-01-18 Fuel feed device Revoked EP1022457B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19902427 1999-01-22
DE1999102427 DE19902427C1 (en) 1999-01-22 1999-01-22 Fuel delivery unit

Publications (3)

Publication Number Publication Date
EP1022457A2 true EP1022457A2 (en) 2000-07-26
EP1022457A3 EP1022457A3 (en) 2000-12-20
EP1022457B1 EP1022457B1 (en) 2003-01-02

Family

ID=7895040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000100871 Revoked EP1022457B1 (en) 1999-01-22 2000-01-18 Fuel feed device

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US (1) US6425377B1 (en)
EP (1) EP1022457B1 (en)
AU (1) AU754374B2 (en)
BR (1) BR0000133A (en)
DE (2) DE19902427C1 (en)
ES (1) ES2189707T3 (en)

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DE102004002459A1 (en) * 2004-01-16 2005-08-11 Siemens Ag A method of adjusting the delivery rate of a fuel pump unit and fuel pump unit for fueling the fuel tank from the fuel tank
US7632060B2 (en) * 2005-01-24 2009-12-15 Ford Global Technologies, Llc Fuel pump having dual flow channel
US7165932B2 (en) * 2005-01-24 2007-01-23 Visteon Global Technologies, Inc. Fuel pump having dual single sided impeller
DE102006003669A1 (en) * 2006-01-26 2007-08-02 Bayerische Motoren Werke Ag Fuel delivery system in automobile, with pre-pump and main delivery pump, passes fuel flow developed by main pump through e.g. turbo-machine to drive pre-pump
JP4552906B2 (en) * 2006-02-24 2010-09-29 株式会社デンソー Fuel supply device
EP3004644A4 (en) 2013-05-31 2017-08-23 Intellectual Property Holdings, LLC Natural gas compressor

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Also Published As

Publication number Publication date
DE50000987D1 (en) 2003-02-06
US6425377B1 (en) 2002-07-30
BR0000133A (en) 2000-10-17
ES2189707T3 (en) 2003-07-16
AU1244100A (en) 2000-07-27
AU754374B2 (en) 2002-11-14
EP1022457B1 (en) 2003-01-02
EP1022457A3 (en) 2000-12-20
DE19902427C1 (en) 2000-08-24

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