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EP0471212A1 - Kompakte elektromagnetische Brennstoffeinspritzdüse für eine Vorrichtung zur Zuführung von Brennstoff einer Brennkraftmaschine - Google Patents

Kompakte elektromagnetische Brennstoffeinspritzdüse für eine Vorrichtung zur Zuführung von Brennstoff einer Brennkraftmaschine Download PDF

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Publication number
EP0471212A1
EP0471212A1 EP91112264A EP91112264A EP0471212A1 EP 0471212 A1 EP0471212 A1 EP 0471212A1 EP 91112264 A EP91112264 A EP 91112264A EP 91112264 A EP91112264 A EP 91112264A EP 0471212 A1 EP0471212 A1 EP 0471212A1
Authority
EP
European Patent Office
Prior art keywords
valve
fact
sleeve
plate
anchor
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Withdrawn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
EP91112264A
Other languages
English (en)
French (fr)
Inventor
Francesco Morini
Mirco Vignoli
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.)
Weber SRL
Original Assignee
Weber SRL
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 Weber SRL filed Critical Weber SRL
Publication of EP0471212A1 publication Critical patent/EP0471212A1/de
Withdrawn legal-status Critical Current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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0646—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being a short body, e.g. sphere or cube
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0646—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being a short body, e.g. sphere or cube
    • F02M51/065—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being a short body, e.g. sphere or cube the valve being spherical or partly spherical

Definitions

  • the present invention relates to an electromagnetic fuel metering and atomizing valve for an internal combustion engine fuel supply device.
  • valves of the aforementioned type substantially comprise a body defined by a lateral surface comprising a number of cylindrical surface portions of different diameters and the bottom end of which is fitted with a substantially cylindrical injection nozzle having at least one fuel injection orifice.
  • An elongated plunger slides inside an axial cavity in the nozzle and a hole in the body, and the body houses a ferromagnetic core and an excitation coil for producing a magnetic flux in the core, the body and an anchor fitted to the top end of the plunger, so as to attract the anchor to the core and so control displacement of the plunger for opening the injection orifice.
  • the plunger is normally kept in the closed position by a spring, the ends of which rest on respective shoulders on the plunger and core.
  • a major drawback of known valves of the type briefly described above lies in the large size, particularly lengthwise, of the valves, which are difficult to fit on to engines with limited valve seating space.
  • a first object of the present invention is therefore to provide a fairly compact valve, particularly lengthwise, enabling troublefree fitment on engines with limited valve seating space.
  • a further object of the present invention is to provide a valve of extremely straightforward design, comprising a small number of component parts, and enabling fast, troublefree assembly.
  • an electromagnetic fuel metering and atomizing valve for an internal combustion engine fuel supply device, said valve substantially comprising an axially-sliding plunger for controlling fuel passage through at least one injection orifice and activated by an electromagnet; characterised by the fact that it comprises:
  • the valve according to the present invention substantially comprises a ferromagnetic sleeve 1 fitted and forming a single unit with a plastic spool 2 conveniently injection molded directly on to outer surface 3 of sleeve 1.
  • annular grooves 4 may conveniently be formed in known manner on surface 3, and sleeve 1 used as an insert inside the mold of spool 2 according to known injection molding techniques.
  • the valve also comprises a winding 5 of electrically-conductive wire coated with insulating material, defining an annular electromagnet, and formed by winding a given number of turns of said wire on to spool 2.
  • the valve also comprises an enclosure 6 made of plastic material containing ferromagnetic material, and enclosing and forming a single unit 7 (Fig.1) with sleeve 1, spool 2 and winding 5.
  • Enclosure 6 is formed by injection molding said plastic material on to said unit comprising sleeve 1, spool 2 and winding 5.
  • Unit 7 is defined at the bottom by a flat surface 8, and enclosure 6 laterally by a substantially cylindrical surface 9. As shown in Fig.1, the ends 12 of the wires of winding 5 are fitted through both spool 2 and enclosure 6, and come out through the upper surface of enclosure 6.
  • the valve comprises at least one round plate 13 having at least one injection orifice 14 (in the Fig.1 embodiment, several orifices are provided).
  • Plate 13 is defined at the top and bottom by respective flat surfaces 15 and 16 substantially parallel to flat surface 8 of unit 7, and laterally by a cylindrical surface substantially coinciding with cylindrical surface 9 externally defining enclosure 6.
  • a cup-shaped housing 17 houses plate 13, unit 7 and an annular spacer 18 inserted between plate 13 and unit 7 so as to define a chamber 19 of predetermined size.
  • Injection orifices 14 come out inside a hole 23 in bottom wall 20 of housing 17, which presents a top cover 24, the top wall of which presents a hole 25 housing the top end of sleeve 1 as shown in Fig.1.
  • the valve also comprises a disk-shaped anchor 26 housed in and moving axially inside chamber 19, and fitted with a disk 27 resting on top surface 15 of plate 13 and defining the valve plunger.
  • anchor 26 and disk 27 may be made of any permeable material. e.g. soft material, in which case, they are formed in one piece and chromium-plated to produce a surface hardness sufficient to withstand working stress.
  • the end surface of sleeve 1 facing anchor 26 may also conveniently be chromium-plated.
  • An end portion of hole 29 in sleeve 1 is fitted with an annular element 28, which fits inside a hole in anchor 26 for guiding axial slide of the same.
  • Anchor 26 is thrust against plate 13 by a helical spring 30 housed inside hole 29 in sleeve 1 and inside annular element 28.
  • the ends of spring 30 conveniently rest respectively on disk 27 and on a shoulder formed by a tube 31 force-fitted inside hole 29.
  • the lateral wall of housing 17 presents at least one radial hole 33, and spacer 18 presents at least one slot 34 communicating with chamber 19 and radial hole 33, so as to form a fuel supply duct to chamber 19. Provision is conveniently made for two diametrically-opposed radial holes 33 and slots 34, so as to form two ducts for supplying and draining fuel to and from chamber 19.
  • the inner surface of bottom wall 20 of housing 17 is flat for supporting the flat bottom surface 16 of plate 13, and the cylindrical inner surface of the lateral wall of housing 17 substantially mates with the outer surface 9 of enclosure 6.
  • Top surface 15 of plate 13 conveniently presents an annular recess 36 defining a corresponding annular projection 37 for seating disk 27.
  • disk 27 presents a substantially spherical bottom surface 38 mating with a spherical surface portion formed on plate 13.
  • plate 13 which in this case presents an axial hole 39 instead of injection orifices, provision is made between plate 13 and bottom wall 20 of housing 17 for a thin plate 40 in which injection orifices 14 are formed.
  • a sealing ring 41 is conveniently inserted between plate 13 (Fig.3) and the lateral wall of housing 17.
  • a sealing ring 41 is inserted between plates 13 and 40 and the lateral wall of housing 17.
  • housing 17 and cover 24 enclosing all the valve components may be replaced by the walls of a fuel manifold forming part of the vehicle fuel supply device, in which case, the manifold presents appropriate seats defining cavities similar to those formed inside housing 17 and cover 24.
  • Pressurized fuel is fed through injection orifice 33 to fill chamber 19, from which it is injected through orifices 14 when anchor 26 is detached from plate 13. Any unused fuel flows back through orifice 33 diametrically opposite the inlet orifice.
  • valve described above is evidently highly compact, particularly lengthwise, due to integration of spool 2 and sleeve 1, and the ferromagnetic properties of enclosure 6 surrounding sleeve 1, spool 2 and winding 5, which effectively contributes towards producing the magnetic circuit on the valve.
  • valve presents injection orifices formed directly on plate 13, while anchor 26 is so designed as to be of minimum length.
  • valve according to the present invention is extremely straightforward in design, due to the small number of component parts and the manner in which these are connected.
  • Spool 2 and enclosure 6, in fact, are so designed as to enable troublefree manufacture and simultaneous connection to sleeve 1, while unit 7, plate 13 and spacer 18 provide for fast, troublefree assembly inside housing 17 with no special positioning required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Exhaust Gas After Treatment (AREA)
EP91112264A 1990-07-31 1991-07-22 Kompakte elektromagnetische Brennstoffeinspritzdüse für eine Vorrichtung zur Zuführung von Brennstoff einer Brennkraftmaschine Withdrawn EP0471212A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6761290 1990-07-31
IT67612A IT1240525B (it) 1990-07-31 1990-07-31 Valvola dosatrice e polverizzatrice di carburante ad azionamento elettromagnetico per un dispositivo di alimentazione di un motore a combustione interna avente ingombro molto ridotto.

Publications (1)

Publication Number Publication Date
EP0471212A1 true EP0471212A1 (de) 1992-02-19

Family

ID=11303873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91112264A Withdrawn EP0471212A1 (de) 1990-07-31 1991-07-22 Kompakte elektromagnetische Brennstoffeinspritzdüse für eine Vorrichtung zur Zuführung von Brennstoff einer Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP0471212A1 (de)
IT (1) IT1240525B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1612400A1 (de) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Methode zur Herstellung eines Brennstoffeinspritzventils für eine Brennkraftmaschine und Einspritzventil hergestellt gemäss dieser Methode
WO2014206766A1 (de) * 2013-06-25 2014-12-31 Robert Bosch Gmbh Magnetventil und kraftstoffinjektor mit einem magnetventil

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2058466A (en) * 1979-09-08 1981-04-08 Bosch Gmbh Robert Electromagnetic fuel injection valve
EP0144082A2 (de) * 1983-12-02 1985-06-12 Hitachi, Ltd. Elektromagnetisches Kraftstoff-Einspritzventil
DE3520154A1 (de) * 1985-06-05 1986-12-11 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares ventil
GB2178483A (en) * 1985-07-31 1987-02-11 Lucas Ind Plc Fuel injector for I.C. engines
DE3727342A1 (de) * 1987-08-17 1989-03-02 Bosch Gmbh Robert Elektromagnetisch betaetigbares kraftstoffeinspritzventil
EP0352444A1 (de) * 1988-07-23 1990-01-31 Robert Bosch Gmbh Elektromagnetisch betätigbares Ventil und Verfahren zur Herstellung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2058466A (en) * 1979-09-08 1981-04-08 Bosch Gmbh Robert Electromagnetic fuel injection valve
EP0144082A2 (de) * 1983-12-02 1985-06-12 Hitachi, Ltd. Elektromagnetisches Kraftstoff-Einspritzventil
DE3520154A1 (de) * 1985-06-05 1986-12-11 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares ventil
GB2178483A (en) * 1985-07-31 1987-02-11 Lucas Ind Plc Fuel injector for I.C. engines
DE3727342A1 (de) * 1987-08-17 1989-03-02 Bosch Gmbh Robert Elektromagnetisch betaetigbares kraftstoffeinspritzventil
EP0352444A1 (de) * 1988-07-23 1990-01-31 Robert Bosch Gmbh Elektromagnetisch betätigbares Ventil und Verfahren zur Herstellung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1612400A1 (de) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Methode zur Herstellung eines Brennstoffeinspritzventils für eine Brennkraftmaschine und Einspritzventil hergestellt gemäss dieser Methode
US7464912B2 (en) 2004-06-30 2008-12-16 C.R.F. Societa Consortile Per Azioni Method for obtaining a fuel injector for an internal-combustion engine, and an injector made according to said method
US8020834B2 (en) 2004-06-30 2011-09-20 C.R.F. Societa Consortile Per Azoni Method for obtaining a fuel injector for an internal-combustion engine, and an injector made according to said method
WO2014206766A1 (de) * 2013-06-25 2014-12-31 Robert Bosch Gmbh Magnetventil und kraftstoffinjektor mit einem magnetventil

Also Published As

Publication number Publication date
IT1240525B (it) 1993-12-17
IT9067612A1 (it) 1992-01-31
IT9067612A0 (it) 1990-07-31

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