EP0348786A2 - Soupape électromagnétique d'injection de combustible - Google Patents

Soupape électromagnétique d'injection de combustible Download PDF

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Publication number
EP0348786A2
EP0348786A2 EP89111120A EP89111120A EP0348786A2 EP 0348786 A2 EP0348786 A2 EP 0348786A2 EP 89111120 A EP89111120 A EP 89111120A EP 89111120 A EP89111120 A EP 89111120A EP 0348786 A2 EP0348786 A2 EP 0348786A2
Authority
EP
European Patent Office
Prior art keywords
injection valve
fuel injection
nozzle openings
valve according
fuel
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
EP89111120A
Other languages
German (de)
English (en)
Other versions
EP0348786A3 (en
EP0348786B1 (fr
Inventor
Mauro Forapianti
Alberto Manetti
Riccardo Toncelli
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0348786A2 publication Critical patent/EP0348786A2/fr
Publication of EP0348786A3 publication Critical patent/EP0348786A3/de
Application granted granted Critical
Publication of EP0348786B1 publication Critical patent/EP0348786B1/fr
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
    • 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
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0667—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature acting as a valve or having a short valve body attached thereto
    • 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
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • 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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the invention relates to an electromagnetic fuel injection valve for an internal combustion engine according to the preamble of claim 1.
  • the fuel jet can only be directed onto one of the inlet valves and the above requirements cannot be met.
  • a solution to this problem is described in GB 2 148 388.
  • a fuel injection valve with two nozzle openings at the lower end of an expansion chamber downstream of the valve seat is used. The cross-section and the alignment of these two nozzle openings inject the correct amount of fuel onto the inlet valves.
  • a disadvantage of this solution is the "dead volume" of the expansion chamber, which reduces the pressure available at the nozzle openings.
  • fuel can remain in this volume of the expansion chamber, and fuel can thus incorrectly get into the intake manifold even when the fuel injection valve is closed.
  • Another problem with this solution is that the two nozzle openings are located at the lower end of the fuel injection valve and are exposed there unprotected to the gases in the intake manifold. This quickly leads to deposits at the nozzle openings, which impair the function of the fuel injector.
  • the object of the present invention is therefore to design such a fuel injection valve in such a way that the disadvantages described above are avoided.
  • a movable armature with a plastic insert attached to its underside takes over the valve function together with a nozzle body.
  • the plastic insert has a flat sealing ring surface and the nozzle body has an annular valve seat that fit exactly together.
  • At least two nozzle openings extend from the bottom of this inner chamber and are directed in such a way that the fuel jet emerging from them hits the respective inlet valve of the associated cylinder.
  • the nozzle openings open into an outer chamber, which is symmetrical to the inner chamber but much larger than this.
  • This outer chamber is open at the bottom, so that it does not impair the fuel flow from the nozzle openings, but shields the nozzle openings from the gases in the intake manifold and thus does not shield itself Form deposits at the nozzle openings.
  • the length of the outer chamber is selected so that precipitation of fuel from the nozzle openings on its wall is avoided, but is large enough to provide a sealing element on the outer surface of the outer chamber between the injection valve and its receiving part in the intake manifold of the internal combustion engine.
  • Such a fuel injection valve avoids additional costs for a structurally complex large expansion chamber and does not limit the installation options of the valve on the engine. It also has a very small “dead volume" downstream of the valve seat, thus ensuring maximum pressure at the nozzle openings.
  • FIG. 1 shows an electromagnetic fuel injection valve with a longitudinal axis L and a housing 1 made of magnetizable material.
  • an electrical coil 2 is wound on a coil carrier 3, which surrounds a cylindrical magnetic core 4 made of magnetizable material.
  • a sleeve 5 made of non-magnetizable material is attached, which serves as a longitudinal guide for a pot-shaped movable armature 6.
  • This armature 6 forms, together with the housing 1 and the magnetic core 4, a magnetic circuit.
  • the movable armature 6 carries a plastic insert 7 which interacts with the top of a nozzle body 8. This forms a locking system for the fuel, which flows through an axial bore 9 and transverse holes 10 in the magnetic core 4. In the closed state, the locking system is kept closed via the force of a spring 11 on the armature 6, which is located in the magnetic core 4 and is supported in a receiving sleeve 12.
  • connection conductors 13 which are partially embedded in a plastic connector 14.
  • the armature 6 is pulled towards the magnetic core 4 by a magnetic force and thereby overcomes the counterforce through the spring 11. It thus moves away from the nozzle body 8 and thus allows fuel flow through nozzle openings 21 in the nozzle body 8.
  • the fuel injector also includes a series of seals and a spacer 16, the thickness of which determines the stroke of the armature 6. Furthermore, an inlet filter 17 is provided on the top of the fuel injection valve.
  • FIG 2 the part of the fuel injector essential to the invention is shown enlarged.
  • the plastic insert 7 at the lower end of the cup-shaped armature 6 is held in place by the slipped edge of the armature 6.
  • the plastic insert 7 On the downward-facing side, the plastic insert 7 has a flat sealing ring surface 18 which is opposite one another Valve seat 19 cooperates on the upwardly facing side of the nozzle body 8.
  • the nozzle body 8 is cup-shaped, with a transverse wall 80 upwards.
  • the sealing ring surfaces 18 and the valve seat 19 form the locking system, which releases or blocks the fuel flow to the nozzle openings 21.
  • the inner diameter of the valve seat 19 defines an inner chamber 20, the depth of which is not more than a quarter of this diameter. This dimensioning offers an optimum for the fuel flow to the nozzle openings 21.
  • the nozzle openings 21 at the bottom of the inner chamber 20 are directed in a straight line such that they each enclose an angle ⁇ with the longitudinal axis L of the fuel injection valve, but point in different directions.
  • the number of nozzle openings 21 and the respective angle ⁇ is chosen so that each inlet valve of the cylinder supplied by the fuel injection valve is supplied with the correct amount of fuel without wetting the intake manifold walls.
  • the nozzle openings 21 all have the same cross section. If, on the other hand, a stratified air-fuel ratio is required in the combustion chamber and thus different amounts of fuel have to be supplied to the individual intake valves, the nozzle openings 21 have different cross sections.
  • the nozzle openings 21 can be designed completely independently of one another or (as shown in FIG. 2) have a common inlet space at the bottom of the inner chamber 20.
  • a conical bulge 22 may be provided within the sealing ring surface 18, which partially fills the volume of the inner chamber 20.
  • Such a conical bulge 22 also acts as a guide surface for the precise guidance of the fuel flow to the nozzle openings 21. This guide surface function can be further improved by the fact that the bottom of the inner chamber 20 also has a conical shape.
  • the nozzle openings 21 open into an outer chamber 24 in the outer side 23.
  • This outer chamber 24 is significantly larger than the inner chamber 20.
  • a cylindrical wall 25 of the outer chamber 24 has the necessary length to keep the nozzle openings 21 free of deposits which are caused by the gas mixture flowing back from the suction pipe could arise.
  • this length is so limited that a free flow of fuel to the inlet valves is ensured without wetting an inner wall surface 26 of the cylindrical wall 25 of the outer chamber 24.
  • the fuel not only maintains the desired flow direction but also the original spray pattern.
  • a sealing element 27 in the form of an elastic O-ring, which seals the fuel injection valve with respect to its receiving part in the intake manifold of the internal combustion engine.
  • FIG. 3 shows a further solution for the locking function, in which a sealing ring surface 18 'of a plastic insert 7' and a surface of an inner chamber 20 'are flat.
  • Two nozzle openings 21 ' have different angles ⁇ ' and ⁇ ⁇ with respect to the longitudinal axis L of the fuel injector.
  • FIG. 4 shows a further solution for a nozzle body 81.
  • An outer side 23 ⁇ of a second chamber 24 ⁇ closes a 90 ° angle with the axes of Dü openings 21 ⁇ .
  • the outer surface of a cylindrical wall 25 ⁇ carries in addition to the O-ring a cap 29 which is intended to facilitate the insertion of the fuel injection valve when it is installed in its receiving part in the intake manifold of the internal combustion engine.
  • the nozzle openings 21 ⁇ also have curves at the transition to the inner chamber 20 ⁇ , which improve the fuel flow and make it more uniform. These curves can also be replaced by conical transitions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP89111120A 1988-06-28 1989-06-19 Soupape électromagnétique d'injection de combustible Expired - Lifetime EP0348786B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3821776 1988-06-28
DE3821776 1988-06-28

Publications (3)

Publication Number Publication Date
EP0348786A2 true EP0348786A2 (fr) 1990-01-03
EP0348786A3 EP0348786A3 (en) 1990-08-22
EP0348786B1 EP0348786B1 (fr) 1992-08-26

Family

ID=6357425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89111120A Expired - Lifetime EP0348786B1 (fr) 1988-06-28 1989-06-19 Soupape électromagnétique d'injection de combustible

Country Status (2)

Country Link
EP (1) EP0348786B1 (fr)
DE (1) DE58902133D1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100457A1 (de) * 1990-01-17 1991-07-18 Weber Srl Ventil in einer versorgungsanlage eines motors mit interner verbrennung
DE4113682A1 (de) * 1991-04-26 1992-10-29 Bosch Gmbh Robert Einspritzventil
EP0676542A1 (fr) * 1994-04-09 1995-10-11 Robert Bosch Gmbh Injecteur électromagnétique de carburant
FR2744766A1 (fr) * 1996-02-14 1997-08-14 Peugeot Motocycles Sa Electrovanne notamment d'impact pour un systeme d'injection de carburant par effet de coup de belier dans un moteur thermique de vehicule
WO1999013213A1 (fr) 1997-09-06 1999-03-18 Robert Bosch Gmbh Injecteur de carburant
NL1009348C2 (nl) * 1998-06-09 1999-12-10 Helvoet B V Magneetanker.
WO2002084104A1 (fr) * 2001-04-11 2002-10-24 Robert Bosch Gmbh Soupape d'injection de combustible
DE10142299A1 (de) * 2001-08-29 2003-04-17 Bosch Gmbh Robert Brennstoffeinspritzsystem

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2518031Y2 (ja) * 1990-12-19 1996-11-20 株式会社ユニシアジェックス 燃料噴射弁
DE4325842A1 (de) * 1993-07-31 1995-02-02 Bosch Gmbh Robert Brennstoffeinspritzventil
DE4421429A1 (de) * 1994-06-18 1995-12-21 Bosch Gmbh Robert Elektromagnetisch betätigbares Brennstoffeinspritzventil
DE19512339B4 (de) * 1995-04-01 2010-06-10 Robert Bosch Gmbh Elektromagnetisch betätigbares Brennstoffeinspritzventil
DE10124744A1 (de) 2001-05-21 2003-01-23 Bosch Gmbh Robert Brennstoffeinspritzventil

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB400836A (en) * 1932-03-19 1933-11-02 Schweizerische Lokomotiv Improvements in or relating to fuel nozzles for internal combustion engines
US4139158A (en) * 1975-09-01 1979-02-13 Diesel Kiki Co., Ltd. Fuel discharge nozzle
FR2436887A1 (fr) * 1978-09-22 1980-04-18 Nissan Motor Soupape d'injection de fluide
GB2034816A (en) * 1978-11-24 1980-06-11 Maschf Augsburg Nuernberg Ag Multi-aperture injection nozzle for an air compression internal combustion engine
GB2057193A (en) * 1979-08-03 1981-03-25 Alfa Romeo Spa Rapid transient fuel electroinjector
EP0197567A2 (fr) * 1985-02-07 1986-10-15 WEBER S.r.l. Injecteur électromagnétique pour un moteur à combustion interne
US4657189A (en) * 1985-03-13 1987-04-14 Aisan Kogyo Kabushiki Kaisha Electromagnetic fuel injection valve for an internal combustion engine having a plurality of intake valves
DE8709111U1 (fr) * 1987-07-01 1987-09-17 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
WO1987007334A2 (fr) * 1986-05-31 1987-12-03 Robert Bosch Gmbh Soupape d'injection de carburant

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB400836A (en) * 1932-03-19 1933-11-02 Schweizerische Lokomotiv Improvements in or relating to fuel nozzles for internal combustion engines
US4139158A (en) * 1975-09-01 1979-02-13 Diesel Kiki Co., Ltd. Fuel discharge nozzle
FR2436887A1 (fr) * 1978-09-22 1980-04-18 Nissan Motor Soupape d'injection de fluide
GB2034816A (en) * 1978-11-24 1980-06-11 Maschf Augsburg Nuernberg Ag Multi-aperture injection nozzle for an air compression internal combustion engine
GB2057193A (en) * 1979-08-03 1981-03-25 Alfa Romeo Spa Rapid transient fuel electroinjector
EP0197567A2 (fr) * 1985-02-07 1986-10-15 WEBER S.r.l. Injecteur électromagnétique pour un moteur à combustion interne
US4657189A (en) * 1985-03-13 1987-04-14 Aisan Kogyo Kabushiki Kaisha Electromagnetic fuel injection valve for an internal combustion engine having a plurality of intake valves
WO1987007334A2 (fr) * 1986-05-31 1987-12-03 Robert Bosch Gmbh Soupape d'injection de carburant
DE8709111U1 (fr) * 1987-07-01 1987-09-17 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100457A1 (de) * 1990-01-17 1991-07-18 Weber Srl Ventil in einer versorgungsanlage eines motors mit interner verbrennung
DE4113682A1 (de) * 1991-04-26 1992-10-29 Bosch Gmbh Robert Einspritzventil
EP0676542A1 (fr) * 1994-04-09 1995-10-11 Robert Bosch Gmbh Injecteur électromagnétique de carburant
FR2744766A1 (fr) * 1996-02-14 1997-08-14 Peugeot Motocycles Sa Electrovanne notamment d'impact pour un systeme d'injection de carburant par effet de coup de belier dans un moteur thermique de vehicule
WO1999013213A1 (fr) 1997-09-06 1999-03-18 Robert Bosch Gmbh Injecteur de carburant
NL1009348C2 (nl) * 1998-06-09 1999-12-10 Helvoet B V Magneetanker.
WO2002084104A1 (fr) * 2001-04-11 2002-10-24 Robert Bosch Gmbh Soupape d'injection de combustible
DE10118163B4 (de) * 2001-04-11 2007-04-19 Robert Bosch Gmbh Brennstoffeinspritzventil
US7306173B2 (en) 2001-04-11 2007-12-11 Robert Bosch Gmbh Fuel injection valve
DE10142299A1 (de) * 2001-08-29 2003-04-17 Bosch Gmbh Robert Brennstoffeinspritzsystem

Also Published As

Publication number Publication date
EP0348786A3 (en) 1990-08-22
DE58902133D1 (de) 1992-10-01
EP0348786B1 (fr) 1992-08-26

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