EP0297256B1 - Fuel supply device - Google Patents

Fuel supply device Download PDF

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Publication number
EP0297256B1
EP0297256B1 EP88107670A EP88107670A EP0297256B1 EP 0297256 B1 EP0297256 B1 EP 0297256B1 EP 88107670 A EP88107670 A EP 88107670A EP 88107670 A EP88107670 A EP 88107670A EP 0297256 B1 EP0297256 B1 EP 0297256B1
Authority
EP
European Patent Office
Prior art keywords
supply unit
fuel supply
fuel
unit according
tank
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
EP88107670A
Other languages
German (de)
French (fr)
Other versions
EP0297256A3 (en
EP0297256A2 (en
Inventor
Piet-Jürgen Reinhardt
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.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP0297256A2 publication Critical patent/EP0297256A2/en
Publication of EP0297256A3 publication Critical patent/EP0297256A3/en
Application granted granted Critical
Publication of EP0297256B1 publication Critical patent/EP0297256B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M37/08—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

Definitions

  • the invention relates to a fuel delivery unit according to the preamble of patent claim 1.
  • a fuel delivery unit known from DE-A-15 26 652 has an electric fuel pump which rests on the tank bottom via an elastic cushion and is suspended directly on the delivery pipe, this delivery pipe being of two parts and the two sections being connected to one another via a sleeve or sleeve are.
  • This sleeve or sleeve can be, for example, a plastic tube or another elastic, flexible device. The pump is pressed against the tank bottom via the pipe section, the carrier pipe and the sleeve forming a kind of preload.
  • the pump is also suspended from the delivery pipe, but can move axially sufficiently and is supported either directly or via a separate support foot on the tank bottom with the aid of damping elements.
  • a guide is provided on the tank cap, which engages in a frame by means of laterally projecting flanges and can be moved leads.
  • the fuel pump is arranged on this frame by means of damping elements.
  • return lines are provided below the fuel level in order to prevent unnecessary vapor formation.
  • the task of the invention is to design a generic fuel delivery unit in such a way that the suction connection of the fuel pump and the return line outlet are always directly above the tank bottom, even when the tank bottom is lowered.
  • the fuel delivery unit shown in Figure 1 consists of a tank cap 1 with a pressure line part 2 and a return line part 4.
  • a lower part 6 with further line parts 3, 9 of the pressure and the return line is pushed over these two line parts 2, 4, a compression spring 5 being pushed onto the return line part 4 between cover 1 and lower part 6, so that the lower part 6 extends the return line axis is supported under the force of this spring 5 on the tank bottom 7.
  • the pressure line 9 in the lower part 6 is connected to the pressure connection of an electric fuel pump 8 via a bellows 11 acting as a damping element.
  • the return line 3 in the lower part 6 opens out into the fuel tank via an outlet opening 14.
  • a sealing ring 17 is advantageously arranged in the region of the pressure line 9 for sealing the pressure line part 2.
  • spring elements 18 are provided for radial fixation, the filter element 12 being designed as a damping element which rests on the tank bottom and has a greater spring stiffness than that between the electric fuel pump 8 and the bellows 11 attached to the pressure line part 9.
  • the filter element 12 is connected to the electric fuel pump via a further damping element 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Vibration Dampers (AREA)

Description

Die Erfindung betrifft eine Brennstoffördereinheit nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a fuel delivery unit according to the preamble of patent claim 1.

Eine aus der DE-A-15 26 652 bekannte Brennstoffördereinheit weist eine elektrische, über ein elastisches Kissen am Tankboden anliegende Kraftstoffpumpe auf, die unmittelbar am Förderrohr aufgehängt ist, wobei dieses Förderrohr zweiteilig ausgeführt ist und die beiden Teilstücke über eine Hülse oder Muffe miteinander verbunden sind. Diese Hülse oder Muffe kann beispielsweise ein Kunststoffrohr oder eine andere elastische, nachgiebige Einrichtung sein. Die Pumpe ist über das Rohrstück gegen den Tankboden gedrückt, wobei das Trägerrohr und die Muffe eine Art Vorspannung bilden.A fuel delivery unit known from DE-A-15 26 652 has an electric fuel pump which rests on the tank bottom via an elastic cushion and is suspended directly on the delivery pipe, this delivery pipe being of two parts and the two sections being connected to one another via a sleeve or sleeve are. This sleeve or sleeve can be, for example, a plastic tube or another elastic, flexible device. The pump is pressed against the tank bottom via the pipe section, the carrier pipe and the sleeve forming a kind of preload.

Die in einer Größenordnung bis zu 15 mm zu erwartenden Höhentoleranzen heute verwendeter Brennstofftanks kann obige Pumpe durch senkrechtes Bewegungsspiel nicht ausgleichen, weil bei dieser Ausführung die Muffe verhältnismäßig starr ausgebildet sein muß, um eine ausreichende Lagesicherung der Pumpe zu gewährleisten und das parallel zum Tankboden laufende Förderrohr nur in begrenztem Maß ausgelenkt werden kann.The above-mentioned height tolerances of the fuel tanks used today cannot be compensated for by the vertical movement of the above pump, because in this version the sleeve must be relatively rigid to ensure that the pump is adequately secured and the delivery pipe running parallel to the tank bottom can only be deflected to a limited extent.

Bei einer Ausführung nach der DE-A-27 50 081 ist die Pumpe ebenfalls an dem Förderrohr aufgehängt, kann sich jedoch axial ausreichend verschieben und stützt sich entweder direkt oder über einen separaten Stützfuß am Tankboden unter Zuhilfenahme von Dämpfungselementen ab.In an embodiment according to DE-A-27 50 081, the pump is also suspended from the delivery pipe, but can move axially sufficiently and is supported either directly or via a separate support foot on the tank bottom with the aid of damping elements.

Um ein Verdrehen der Pumpe auf dem Förderrohr zu verhindern, ist am Tankverschlußdeckel eine Führung vorgesehen, die mittels seitlich abstehender Flansche in ein Gestell eingreift und dieses verschieblich führt. An dieses Gestell ist mittels Dämpfungselemente die Brennstoffpumpe angeordnet.In order to prevent the pump from rotating on the delivery pipe, a guide is provided on the tank cap, which engages in a frame by means of laterally projecting flanges and can be moved leads. The fuel pump is arranged on this frame by means of damping elements.

Für neuere Brennstoffördereinrichtungen ist eine Einmündung von Rücklaufleitungen unterhalb des Brennstoffspiegels vorgesehen, um überflüssige Dampfbildung zu verhindern.For newer fuel delivery systems, return lines are provided below the fuel level in order to prevent unnecessary vapor formation.

Vorteilhafterweise ist daher eine Rücklaufleitung mit an dem Tankverschlußdeckel anzuordnen, wobei auch hier Maßnahmen vorzusehen sind, den Rücklaufleitungsaustritt so tief wie möglich im Tank anzuordnen.It is therefore advantageous to arrange a return line with on the tank cap, whereby measures must also be taken here to arrange the outlet of the return line as deep as possible in the tank.

Hiervon ausgehend stellt sich die Erfindungsaufgabe, eine gattungsbildende Brennstoffördereinheit derart zu gestalten, daß sich der Sauganschluß der Brennstoffpumpe und der Rücklaufleitungsaustritt auch bei sich absenkendem Tankboden immer direkt über dem Tankboden befinden.Proceeding from this, the task of the invention is to design a generic fuel delivery unit in such a way that the suction connection of the fuel pump and the return line outlet are always directly above the tank bottom, even when the tank bottom is lowered.

Diese Aufgabe ist durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Vorteilhafter Weiterbildungen sind durch die Merkmale der Unteransprüche gekennzeichnet.This object is achieved by the characterizing features of claim 1. Advantageous further developments are characterized by the features of the subclaims.

Die durch die Erfindung erreichten Vorteile sind in der nachfolgenden Beschreibung eines in der Figur 1 dargestellten Ausführungsbeispiels angegeben.The advantages achieved by the invention are specified in the following description of an exemplary embodiment shown in FIG.

Es zeigen:

Fig. 1
einen Schnitt der Seitenansicht einer ersten Ausführungsform,
Fig. 2
einen Teilschnitt der Seitenansicht einer zweiten Ausführungsform.
Show it:
Fig. 1
2 shows a section of the side view of a first embodiment,
Fig. 2
a partial section of the side view of a second embodiment.

Die in Figur 1 dargestellte Brennstoffördereinheit besteht aus einem Tankverschlußdeckel 1 mit einem fest mit diesem verbundenen Druckleitungsteil 2 und einem Rücklaufleitungsteil 4.The fuel delivery unit shown in Figure 1 consists of a tank cap 1 with a pressure line part 2 and a return line part 4.

Über diese beiden Leitungsteile 2, 4 ist ein Unterteil 6 mit weiterführenden Leitungsteilen 3, 9 der Druck- und der Rücklaufleitung geschoben, wobei zwischen Deckel 1 und Unterteil 6 auf das Rücklaufleitungsteil 4 eine Druckfeder 5 aufgeschoben ist, so daß sich das Unterteil 6 in Verlängerung der Rücklaufleitungsachse unter der Kraft dieser Feder 5 am Tankboden 7 abstützt.A lower part 6 with further line parts 3, 9 of the pressure and the return line is pushed over these two line parts 2, 4, a compression spring 5 being pushed onto the return line part 4 between cover 1 and lower part 6, so that the lower part 6 extends the return line axis is supported under the force of this spring 5 on the tank bottom 7.

Die Druckleitung 9 im Unterteil 6 ist über einen als Dämpfungselement wirkenden Balg 11 mit dem Druckanschluß einer elektrischen Brennstoffpumpe 8 verbunden.The pressure line 9 in the lower part 6 is connected to the pressure connection of an electric fuel pump 8 via a bellows 11 acting as a damping element.

Die Rücklaufleitung 3 im Unterteil 6 mündet über eine Auslaßöffnung 14 in den Brennstofftank aus.The return line 3 in the lower part 6 opens out into the fuel tank via an outlet opening 14.

Dadurch wird gewährleistet, daß die Brennstofförderpumpe 8 mit ihrem Sauganschluß immer direkt über dem Tankboden steht und eine sichere Brennstofförderung auch bei Restmengen garantieren kann.This ensures that the fuel feed pump 8 is always directly above the tank bottom with its suction connection and can guarantee safe fuel delivery even with residual quantities.

Die durch die hydraulische Pulsation entstehenden Schwingungen und Vibrationen werden durch Dämpfungsmittel 13 im Lagerauge 10 und durch das die Pumpe 8 mit der Druckleitung 2 verbindende, als Balg ausgeführte Dämpfungselement 11, wodurch die Druckleitung 2 spannungsfrei wird, derart gedämpft, daß eine Geräuschübertragung auf den Tankverschlußdeckel 1 und damit auf den Brennstofftank vermieden wird.The oscillations and vibrations resulting from the hydraulic pulsation are damped by damping means 13 in the bearing eye 10 and by the damping element 11, which connects the pump 8 to the pressure line 2 and is designed as a bellows, as a result of which the pressure line 2 is de-energized, in such a way that noise is transmitted to the tank cap 1 and thus avoided on the fuel tank.

Das durch die Druckfeder 5 sich immer am Tankboden 7 abstützende Unterteil 6 bewirkt, daß sich die Auslaßöffnung 14 immer dicht über dem Tankboden befindet, wodurch auch bei kleinen Füllmengen der Brennstoffrücklauf unterhalb des Brennstoffspiegels stattfindet, so daß unnötige Gasbildung vermieden wird.The bottom part 6, which is always supported on the tank bottom 7 by the compression spring 5, causes the outlet opening 14 to always be located closely above the tank bottom, as a result of which, even with small fill quantities, the fuel return below the fuel level takes place so that unnecessary gas formation is avoided.

Eine an dem Tankverschluß 1 angebrachte Führungshülse 15, die beim Zusammenbau der Brennstoffördereinheit nach außen federt, greift hinter einen Sperransatz 16 am Unterteil 6 der Rücklaufleitung 3 und verhindert ein unkontrollierbares Auseinanderfallen des Systems im ausgebauten Zustand.A guide sleeve 15 attached to the tank cap 1, which springs outwards when the fuel delivery unit is being assembled, engages behind a locking projection 16 on the lower part 6 of the return line 3 and prevents the system from falling apart uncontrollably when it is removed.

Vorteilhafterweise ist zur Abdichtung des Druckleitungsteils 2 im Bereich der Druckleitung 9 ein Dichtring 17 angeordnet.A sealing ring 17 is advantageously arranged in the region of the pressure line 9 for sealing the pressure line part 2.

Aus Fig. 2 ersichtlich sind bei einer weiteren Ausführungsform zusätzlich zur axialen Fixierung der elektrischen Brennstoffpumpe Federelemente 18 zur radialen Fixierung vorgesehen, wobei das Filterelement 12 als Dämpfungselement ausgebildet ist, das auf dem Tankboden aufliegt und eine größere Federsteifigkeit als der zwischen der elektrischen Brennstoffpumpe 8 und dem Druckleitungsteil 9 angebrachte Balg 11 aufweist.
Das Filterelement 12 ist über ein weiteres Dämpfungselement 19 mit der elektrischen Brennstoffpumpe verbunden.From FIG. 2, in a further embodiment, in addition to the axial fixation of the electric fuel pump, spring elements 18 are provided for radial fixation, the filter element 12 being designed as a damping element which rests on the tank bottom and has a greater spring stiffness than that between the electric fuel pump 8 and the bellows 11 attached to the pressure line part 9.
The filter element 12 is connected to the electric fuel pump via a further damping element 19.

Claims (8)

  1. Fuel supply unit with an electrical fuel pump (8) which can be installed in a fuel tank of a motor vehicle, which fuel pump (8) is fastened by means of a noise-damping element (13) or by means of spring elements (18) to a lower part (6) which is pushed by means of a lower delivery conduit part (9), connected via a further noise-damping element (11) to the delivery connection of the fuel pump (8), onto an upper delivery conduit part (2) permanently connected to the tank sealing cap (1) and which is guided, so that it cannot rotate, by means of a guide permanently connected to the tank sealing cap (1) and is held by distance means at a defined distance from the tank bottom (7) under the force of a compression spring (5) acting on the lower part (6), characterised in that the guide is formed by an upper return conduit part (4) onto which is pushed the lower part (6) with a lower return conduit part (3) emerging into the fuel tank, the compression spring (5) being pushed onto the upper return conduit part (4) between the tank sealing cap (1) and the lower part (6) and the lower part (6) supporting itself on the tank bottom (7) along an extrapolation of the return conduit axis.
  2. Fuel supply unit according to Claim 1, characterised in that the lower part (6) pushed onto the upper return conduit part (4) is held axially, so that it cannot be lost, by means of a guide sleeve (15), which springs radially outwards when the parts are assembled, and a locking projection (16) located on the lower part (6).
  3. Fuel supply unit according to Claim 1 or 2, characterised in that a peripheral groove is fashioned in the lower delivery conduit part (9) accommodating the upper delivery conduit part (2), a sealing ring (18) (sic) being located in the peripheral groove.
  4. Fuel supply unit according to Claims 1 to 3, characterised in that the electrical fuel pump is pressed against an axial surface of a support ring (10) of the lower part (6) in a sprung manner by means of the damping element (11) designed as a bellows.
  5. Fuel supply unit according to Claim 4, characterised in that the noise-damping element (13) is located between axial surfaces and radial surfaces of the support ring (10) and the electrical fuel pump (8).
  6. Fuel supply unit according to one of the preceding Claims 1 to 5, characterised in that the end of the pump directed towards the tank bottom (7) has a filter element (12).
  7. Fuel supply unit according to Claim 6, characterised in that the filter element (12) is designed as a damping element which is in contact with the tank bottom and has a larger spring stiffness than the bellows (11) fitted between the electrical fuel pump (8) and the lower delivery conduit part (9).
  8. Fuel supply unit according to Claim 6 or 7, characterised in that the filter element (12) is connected to the electrical fuel pump by means of a further damping element (19).
EP88107670A 1987-07-03 1988-05-13 Fuel supply device Expired - Lifetime EP0297256B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3721977A DE3721977C2 (en) 1987-07-03 1987-07-03 Fuel delivery unit
DE3721977 1987-07-03

Publications (3)

Publication Number Publication Date
EP0297256A2 EP0297256A2 (en) 1989-01-04
EP0297256A3 EP0297256A3 (en) 1989-12-13
EP0297256B1 true EP0297256B1 (en) 1992-07-22

Family

ID=6330817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88107670A Expired - Lifetime EP0297256B1 (en) 1987-07-03 1988-05-13 Fuel supply device

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EP (1) EP0297256B1 (en)
DE (2) DE3721977C2 (en)
ES (1) ES2034015T3 (en)

Families Citing this family (23)

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JPH0617032Y2 (en) * 1987-11-18 1994-05-02 三菱電機株式会社 In-tank fuel pump
US4961693A (en) * 1988-12-16 1990-10-09 Walbro Corporation Fuel pump isolation mount
US4964787A (en) * 1989-04-06 1990-10-23 Walbro Corporation Electric vehicle pump isolation mount
US4945884A (en) * 1989-10-24 1990-08-07 General Motors Corporation Modular fuel delivery system
FR2681294B1 (en) * 1991-09-12 1997-04-25 Plastic Omnium Cie DEVICE FOR SUCTION OF FUEL FROM THE BOTTOM OF A DEFORMABLE TANK.
DE4141211A1 (en) * 1991-12-13 1993-06-17 Bayerische Motoren Werke Ag Fuel delivery system for motor vehicle - has fuel pump in housing, encapsulated by gas-filled housing, and pump elastically supported in second housing by springs and dampers
DE4142017A1 (en) * 1991-12-19 1993-06-24 Hasso Von Bluecher Filter for redn. of fuel emission from tanks - using adsorption film in form of three=dimensional support contg. adsorbents e.g. microporous carbon@ and porous styrene]-di:vinyl]-benzene polymers
US5165867A (en) * 1992-02-25 1992-11-24 General Motors Corporation Fuel pump mounting
FR2757572B1 (en) * 1996-12-20 1999-03-19 Marwal Systems MOTOR VEHICLE FUEL PUMPING KIT AND TANK AS FITTED
FR2779773B1 (en) * 1998-06-16 2000-09-01 Marwal Systems FUEL GAUGE AND PUMP SYSTEM FOR MOTOR VEHICLE RESERVOIR AND RESERVOIR THUS EQUIPPED
DE19933046B4 (en) * 1999-07-15 2004-08-26 Siemens Ag Delivery unit to be placed in a fuel tank
DE10027991B4 (en) * 2000-06-08 2005-11-10 Kautex Textron Gmbh & Co. Kg Fuel delivery unit
DE10132187B4 (en) * 2001-07-03 2016-07-07 Volkswagen Ag Fuel delivery system and fuel tank
DE10355309A1 (en) * 2003-11-27 2005-06-30 Siemens Ag Fuel delivery unit
JP4329037B2 (en) * 2004-12-28 2009-09-09 株式会社デンソー Fuel supply device
JP4356897B2 (en) * 2005-06-07 2009-11-04 株式会社デンソー Fuel supply device
DE102007015950A1 (en) 2007-04-03 2008-10-09 Ti Automotive (Neuss) Gmbh Fuel pump sleeve
EP2252476A1 (en) * 2008-02-12 2010-11-24 Continental Automotive Systems US, Inc. Fuel component carrier with double sleeve bearing
DE102010019700A1 (en) * 2010-05-07 2011-11-10 Emitec Gesellschaft Für Emissionstechnologie Mbh Container with a sampling line for a working fluid of a motor vehicle
KR101222013B1 (en) * 2010-06-24 2013-02-15 주식회사 코아비스 Fuel supply device for vehicle
US10247597B2 (en) 2016-07-28 2019-04-02 Nissan North America, Inc. Fuel pump assembly
US10173521B2 (en) 2016-07-28 2019-01-08 Nissan North America, Inc. Fuel tank vapor valve assembly
US10215614B2 (en) 2016-07-28 2019-02-26 Nissan North America, Inc. Fuel sender assembly

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Publication number Priority date Publication date Assignee Title
DE2723771C3 (en) * 1977-05-26 1981-12-03 Volkswagenwerk Ag, 3180 Wolfsburg Container arrangement, in particular a fuel container arrangement for a motor vehicle
DE2735917C2 (en) * 1977-08-10 1986-04-03 Robert Bosch Gmbh, 7000 Stuttgart Arrangement for pumping fuel from a storage tank to the internal combustion engine of a motor vehicle
DE2750081C2 (en) * 1977-11-09 1987-01-29 SWF Auto-Electric GmbH, 7120 Bietigheim-Bissingen Fuel feed unit
DE2936773A1 (en) * 1979-09-12 1981-04-02 SWF-Spezialfabrik für Autozubehör Gustav Rau GmbH, 7120 Bietigheim-Bissingen Fuel pump and gauge for IC engine - has pump inside dip tube with float round fuel pipe inside tube
DE3509309A1 (en) * 1985-03-15 1986-09-18 Robert Bosch Gmbh, 7000 Stuttgart Device for feeding fuel from a storage tank to the internal combustion engine of a motor vehicle
US4651701A (en) * 1986-02-13 1987-03-24 Steart-Warner Corp. Submersible fuel pump and sender assembly
US4694857A (en) * 1986-03-31 1987-09-22 Stant Inc. Fuel sender unit

Also Published As

Publication number Publication date
ES2034015T3 (en) 1993-04-01
EP0297256A3 (en) 1989-12-13
DE3721977C2 (en) 1997-02-06
DE3872965D1 (en) 1992-08-27
EP0297256A2 (en) 1989-01-04
DE3721977A1 (en) 1989-01-12

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