EP1837514A1 - Dispositif d'alimentation en carburant pour un moteur à combustion interne - Google Patents

Dispositif d'alimentation en carburant pour un moteur à combustion interne Download PDF

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Publication number
EP1837514A1
EP1837514A1 EP06425195A EP06425195A EP1837514A1 EP 1837514 A1 EP1837514 A1 EP 1837514A1 EP 06425195 A EP06425195 A EP 06425195A EP 06425195 A EP06425195 A EP 06425195A EP 1837514 A1 EP1837514 A1 EP 1837514A1
Authority
EP
European Patent Office
Prior art keywords
fuel
supply assembly
flexible membrane
pumping unit
filtering device
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.)
Withdrawn
Application number
EP06425195A
Other languages
German (de)
English (en)
Inventor
Lanfranco Toschi
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.)
Marelli Europe SpA
Original Assignee
Magneti Marelli Powertrain SpA
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 Magneti Marelli Powertrain SpA filed Critical Magneti Marelli Powertrain SpA
Priority to EP06425195A priority Critical patent/EP1837514A1/fr
Publication of EP1837514A1 publication Critical patent/EP1837514A1/fr
Withdrawn legal-status Critical Current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
    • F02M37/046—Arrangements for driving diaphragm-type pumps

Definitions

  • the present invention relates to a fuel-supply assembly for an internal-combustion engine.
  • the invention finds advantageous application an internal-combustion engine of a motor vehicle having a contained displacement (indicatively, 50 cc or 125 cc), to which the ensuing treatment will make explicit reference without this implying any loss of generality.
  • a fuel-supply assembly comprising a pumping unit designed to draw the fuel from a tank and to feed it in the first place through a filtering unit, then through a pressure-regulating unit, and finally to at least one injector associated to the internal-combustion engine.
  • Each of the pumping, filtering, and pressure-regulating units referred to above is housed in a housing seat of its own provided in the bodywork of the motor vehicle and is connected to the other units via connector pipes. Consequently, known fuel-supply assemblies of the type described above present certain serious drawbacks mainly resulting from the fact that their use is relatively complex and costly, in particular for large-scale production, in so far as it entails the bodywork of the motor vehicle being provided with a housing seat for each of the aforesaid pumping, filtering, and pressure-regulating units.
  • the aim of the present invention is to provide a fuel-supply assembly for an internal-combustion engine, said fuel-supply assembly being free from the drawbacks set forth above.
  • a fuel-supply assembly for an internal-combustion engine is provided according to what is claimed in the annexed claims.
  • the present invention will now be described with reference to the annexed drawing, which illustrates a nonlimiting example of embodiment thereof.
  • the attached figure is a schematic cross-sectional view, with parts removed for reasons of clarity, of a preferred embodiment of the fuel-supply assembly of the present invention.
  • the reference number 1 designates, as a whole, a fuel-supply assembly for an internal-combustion engine, which is designed to be installed on the bodywork of a motor vehicle for feeding the fuel from a tank to at least one injector of the internal-combustion engine itself.
  • the assembly 1 comprises a housing body 2, defined in which is a hydraulic circuit 3, which extends between a fuel-intake pipe 4 receiving the fuel from the tank and an outlet pipe 5 that carries the fuel to the internal-combustion engine and is parallel to the intake pipe 4.
  • a pumping unit 6, which is designed to draw the fuel from the tank and is housed in the housing body 2
  • a filtering device 7, which is designed to filter the fuel, is set downstream of the pumping unit 6, and is housed in the housing body 2
  • a pressure regulator 8 which is designed to control the pressure of the fuel, is set downstream of the filtering device 7, and is housed in the housing body 2.
  • the intake pipe 4 feeds the fuel to the pumping unit 6, and the outlet pipe 5 receives the fuel from the pressure regulator 8.
  • the pumping unit 6 comprises a pumping chamber 9 delimited by a flexible membrane 10, an eccentric cam 11 designed to deform the flexible membrane 10 cyclically, and an electric motor 12 for driving the eccentric cam 11 in rotation.
  • a pumping chamber 9 delimited by a flexible membrane 10, an eccentric cam 11 designed to deform the flexible membrane 10 cyclically, and an electric motor 12 for driving the eccentric cam 11 in rotation.
  • Set between the eccentric cam 11 and the flexible membrane 10 is an axially mobile pin 13, which on one side rests against the flexible membrane 10 and on the opposite side rests against the eccentric cam 11.
  • a rigid bridge 14 Preferably, set between the pin 13 and the flexible membrane 10 is a rigid bridge 14.
  • Housed in the pumping chamber 9 is a spring 15, which is compressed against the flexible membrane 10 and keeps the flexible membrane 10 itself pressed against the pin 13.
  • the eccentric cam 11 is coupled to a shaft 16 of the electric motor 12 by means of a roller-bearing cage 17. In this way, any friction on the movement of rotation is reduced to a minimum.
  • the flexible membrane 10 is preformed and hence has a non-plane section and can present pre-weakened annular areas to favour and guide deformation of the flexible membrane 10 itself. Thanks to the fact that the flexible membrane 10 is preformed, the pressure pulsations generated by the pumping unit 6 are considerably attenuated, the overall noise of the fuel-supply assembly 1 is reduced, and the stroke of the pin 13 is reduced, thus increasing the energy efficiency of the pumping unit 6.
  • the pumping unit 6 has a one-way intake valve 18, which is set between the intake pipe 4 and the pumping chamber 9, and a one-way delivery valve 19, which is set between the pumping chamber 9 and the filtering device 7.
  • the intake valve 18 is coaxial to the delivery valve 19 and to the intake pipe 4. In this way, machining of the housing body 2 is simplified.
  • the flexible membrane 10 is deformed in a direction perpendicular to the intake valve 18, to the delivery valve 19, and to the intake pipe 4.
  • the filtering device 7 comprises a drum filter 20 having a radial fuel inlet from the outside towards the inside and an axial fuel outlet.
  • outlet of the fuel from the filtering device 7 is coaxial to the outlet pipe 5.
  • machining of the housing body 2 is simplified.
  • the housing body 2 has a lid 21 that can be welded in the case where the drum filter 20 never has to be replaced, or else that can be screwed to enable replacement of the drum filter 20.
  • the pressure regulator 8 comprises a pressure-regulating chamber 22 delimited by a flexible membrane 23 and from which there originates the outlet pipe 5, a spring 24, which is compressed against the flexible membrane 23 and is set on the opposite side with respect to the pressure-regulating chamber 22, a discharge pipe 25, which originates in the pressure-regulating chamber 22, and a spherical open/close element 26, which is connected to the flexible membrane 23 and is designed to close an inlet mouth of the discharge pipe 25.
  • the discharge pipe 25 originates in the pressure-regulating chamber 22 and gives out into the intake pipe 4 and is straight and perpendicular to the intake pipe 4 itself.
  • the configuration is a returnless one, in which the excess fuel is recirculated within the fuel-supply assembly 1.
  • the discharge pipe 25 originates in the pressure-regulating chamber 22 and gives out into the tank.
  • the configuration is a classic one, in which the excess fuel is re-introduced into the tank.
  • the returnless configuration is simpler and less expensive to produce, but, on the other hand, tends to heat the fuel to a greater extent; consequently, said configuration can be used only if the fuel has not an excessive tendency to vaporize within the fuel-supply assembly 1.
  • an overpressure valve which constitutes a redundant safety device in regard to the pressure regulator 8.
  • the fuel-supply assembly 1 described above has numerous advantages, in so far as it is simple and inexpensive to produce and above all enables combination in one and the same assembly of the functions of fuel pumping, fuel filtering, and regulation of the pressure of the fuel; in this way, installation of the fuel-supply assembly 1 within a motor vehicle is simple and fast.
  • the fuel-supply assembly 1 described above presents an electrical consumption that is very contained and hence can be advantageously used for supplying the fuel to an internal-combustion engine having a small or very small displacement with a contained availability of electric power.
  • the fuel-supply assembly 1 described above enables supply of fuel at 300 kPa with a current absorption of approximately 0.6-0.7 A (obviously at a voltage of 12 V), whereas an electric fuel pump currently available on the market would require a current absorption of at least 2 A for supplying the fuel at 300 kPa.
  • said fuel-supply assembly 1 can be advantageously used also for applications other than the motorcycle sector; for example, it could be combined to an internal-combustion engine of a machine for agricultural/forestry purposes such as a chainsaw or a mowing machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP06425195A 2006-03-23 2006-03-23 Dispositif d'alimentation en carburant pour un moteur à combustion interne Withdrawn EP1837514A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06425195A EP1837514A1 (fr) 2006-03-23 2006-03-23 Dispositif d'alimentation en carburant pour un moteur à combustion interne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425195A EP1837514A1 (fr) 2006-03-23 2006-03-23 Dispositif d'alimentation en carburant pour un moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP1837514A1 true EP1837514A1 (fr) 2007-09-26

Family

ID=36764680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06425195A Withdrawn EP1837514A1 (fr) 2006-03-23 2006-03-23 Dispositif d'alimentation en carburant pour un moteur à combustion interne

Country Status (1)

Country Link
EP (1) EP1837514A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1240701B (de) * 1960-10-17 1967-05-18 Gen Motors Corp Regeleinrichtung einer Brennstoffeinspritzpumpe fuer Brennkraftmaschinen in Form einer Membranpumpe
US5649514A (en) * 1994-11-04 1997-07-22 Nippondenso Co., Ltd. Fuel supply apparatus
US20010018907A1 (en) * 2000-03-01 2001-09-06 Yasushi Kondou Fuel feeding device for fuel injector
EP1424491A1 (fr) * 2001-08-03 2004-06-02 Mikuni Corporation Systeme d'alimentation en carburant
EP1460260A2 (fr) * 2003-03-19 2004-09-22 Sofabex Pompe à carburant électrique du type à membrane pour véhicule automobile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1240701B (de) * 1960-10-17 1967-05-18 Gen Motors Corp Regeleinrichtung einer Brennstoffeinspritzpumpe fuer Brennkraftmaschinen in Form einer Membranpumpe
US5649514A (en) * 1994-11-04 1997-07-22 Nippondenso Co., Ltd. Fuel supply apparatus
US20010018907A1 (en) * 2000-03-01 2001-09-06 Yasushi Kondou Fuel feeding device for fuel injector
EP1424491A1 (fr) * 2001-08-03 2004-06-02 Mikuni Corporation Systeme d'alimentation en carburant
EP1460260A2 (fr) * 2003-03-19 2004-09-22 Sofabex Pompe à carburant électrique du type à membrane pour véhicule automobile

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