EP0649983A1 - Elektromagnetisch betätigbares Kraftstoffdosier- und Zerstäubungsventil - Google Patents

Elektromagnetisch betätigbares Kraftstoffdosier- und Zerstäubungsventil Download PDF

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Publication number
EP0649983A1
EP0649983A1 EP94116845A EP94116845A EP0649983A1 EP 0649983 A1 EP0649983 A1 EP 0649983A1 EP 94116845 A EP94116845 A EP 94116845A EP 94116845 A EP94116845 A EP 94116845A EP 0649983 A1 EP0649983 A1 EP 0649983A1
Authority
EP
European Patent Office
Prior art keywords
valve
former
casing
annular
tubular
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
EP94116845A
Other languages
English (en)
French (fr)
Other versions
EP0649983B1 (de
Inventor
Mirco Vignoli
Marcello Cristiani
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
Weber SRL
Magneti Marelli 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 Weber SRL, Magneti Marelli SpA filed Critical Weber SRL
Publication of EP0649983A1 publication Critical patent/EP0649983A1/de
Application granted granted Critical
Publication of EP0649983B1 publication Critical patent/EP0649983B1/de
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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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

Definitions

  • the present invention relates to an electromagnetically actuated fuel metering and atomising valve, intended to be fitted to the fuel supply device of an internal combustion engine.
  • valves of the above type include a man body internally housing an annular electromagnet, a core and a movable valve shutter element.
  • the electromagnet consists of a support former and an electrical winding.
  • a main disadvantage lies in the fact that the former and the main body are not directly fixed to each other, but are fixed indirectly by connection between the various fixed components of the valve. It is clear that clearances may exist between the former and the main body, which clearances could increase over time making the position of the electrical winding unstable relative to the axial air gap of the magnetic circuit defined in the valve. It is clear that this instability affects the axial component of the magnetic force controlling the stroke of the valve shutter element, meaning that for each similar command to the electromagnet the time taken for the valve shutter member to complete its stroke could be different. In addition, this clearance could compromise the fluid-tight seal of the valve as the seals would age prematurely as a result of the extra stress (vibration of the various elements) to which they were subjected.
  • the object of the present invention is to provide an electromagnetically operated fuel metering and atomising valve free from the above disadvantages, that is to say one provided with a system which prevents clearances from forming and at the same time provides a reliable fluid-tight seal.
  • An electromagnetically operated fuel metering and atomising valve manufactured according to the present invention and intended to be fitted in the fuel supply device of an internal combustion engine, includes: a tubular casing housing the lower portion of the said valve; an electromagnet consisting of a tubular forger and an electrical winding mounted in an annular seat formed within the interior of the said former; a tubular body with a lower portion made of ferromagnetic material to form the core of a magnetic circuit defined in the said valve; a movable valve shutter member operable to control the passage of fuel through an injection orifice; a movable tubular armature attracted by the said lower portion of the said body when the electromagnet is excited and supporting the said valve shutter member; a plate in which the injection orifice is formed; and a fuel inlet opening defined in the said body; characterised in that it includes an axial interlock between the said casing and the said former, this interlock having at least of a tongue formed in the said casing and a cavity formed in the said former and engaged by the said
  • a magnetically actuated fuel metering and atomising valve is intended to be fitted in the fuel supply device of an internal combustion engine.
  • the valve 1 comprises: a main body 2 forming a tubular casing for the lower part of the valve; an electromagnet 3 defined by a tubular former 4 and an electrical winding 5 mounted in an annular seat within the former 4; a tubular body 6 a lower portion of which is made of ferromagnetic material so as to form the core of a magnetic circuit defined in the valve 1; a movable valve shutter member 8 operable to control the passage of fuel through an injection orifice 11; a movable tubular armature 12 attracted by the portion 7 when the electromagnet 3 is excited and supporting the valve shutter member 8; a plate 13 with the injection orifice 11 formed therein; a fuel inlet 14 formed in an upper portion 15 of the body 6; and a filter 16 fitted in the inlet 14.
  • the former 4 is constituted by two tubular parts 4a and 4b, securely fixed one within the other and made of plastics material, defining within them the seat for the winding 5.
  • a body 17 extends obliquely upwards from an upper area of the outermost section 4b and constitutes an electrical connector as it houses blade-like pins 18 through which the winding 5 is supplied.
  • a wall 19 extends upwardly from an upper area of the section 4b, in a position diametrically opposite the body 17.
  • An annular recess 21 is formed in the inner surface of the upper end of the inner part 4a of the former 4 to house an annular seal 22 which is compressed radially by the portion 7 of the body 6.
  • the seat for the seal 22 is closed at the top by an annular shoulder 23 formed in the body 6.
  • the part 4a of the former 4 has an annular base wall from which an annular pressure foot 24 extends downwardly.
  • two small part-annular grooves 25 are formed in the outer surface of the part 4b.
  • one groove 25 is formed just beneath the lower end of the wall 19 and the other groove 25 is formed just beneath the lower end of the body 17.
  • the portion 7 of the body 6 is installed within the former 4 and contains an annular pin 26 the function of which is to engage against a coil spring 27 arranged fitted betwen the pin 26 and the valve shutter member 8 which is defined by a small plate.
  • the body 2 comprises: a lower portion 28 housing the plate 13; a central portion 31 having a smaller internal diameter than the portion 28 and within which the armature 12 and the valve shutter member 8 are slidable; and an upper portion 32 having a larger internal diameter than the portion 31 so as to define an annular wall 33 between the two.
  • the former 4 is housed in the portion 32, and the annular base wall of the part 4a of the former 4 and the wall 33 define between them an annular seat in which is fitted an annular seal 29 which is compressed axially by the part 4a.
  • the seat for the seal 29 is closed on the inside by the annular foot 24.
  • the seal 29 is first placed on the wall 33 then the former 4 is fitted into the portion 32 of the body 2, taking care to orientate the former 4 in such a way that the wall 19 and the body 17 are in correspondence with a respective notch 34.
  • the former 4 is then pressed against the wall 33 so as to compress the seal 29 in such a way that the tongues 36 are moved into correspondence with respective grooves 25.
  • the invention provides a valve which is simple to manufacture and easy to assemble; it can be assembled with the use of automated machinery.
  • the main advantage of the valve according to the present invention lies in having provided axial interlock between the valve casing and the electromagnet. This interlock enables the position of the electrical winding to be kept stable relative to the wall 33 and thus relative to the airgap of the magnetic circuit, this airgap being defined between the portion 7 of the body 6 and the armature 2.
  • the seal 29 in addition to its role in providing an axial, and therefore particularly effective, fluid-tight seal, the seal 29 also acts as an axial spring, maintaining constant the pressure of the bottom of the grooves 25 against the lower edge of the tongues 36.
  • the locking system between the casing and the electromagnet enables the size of the valve 1 to be kept compact.
  • valve 1 as described and illustrated here without thereby departing from the protective scope of the present invention.
  • interlocking system between the casing and the electromagnet may also be applied to valves which provide for the fuel to enter a central area.
  • this locking system may be made differently from the way described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)
EP94116845A 1993-10-26 1994-10-25 Elektromagnetisch betätigbares Kraftstoffdosier- und Zerstäubungsventil Expired - Lifetime EP0649983B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO930424 1993-10-26
IT93BO000424A IT1264720B1 (it) 1993-10-26 1993-10-26 Valvola dosatrice e polverizzatrice di carburante ad azionamento elettromagnetico.

Publications (2)

Publication Number Publication Date
EP0649983A1 true EP0649983A1 (de) 1995-04-26
EP0649983B1 EP0649983B1 (de) 1998-01-21

Family

ID=11339281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94116845A Expired - Lifetime EP0649983B1 (de) 1993-10-26 1994-10-25 Elektromagnetisch betätigbares Kraftstoffdosier- und Zerstäubungsventil

Country Status (4)

Country Link
EP (1) EP0649983B1 (de)
DE (1) DE69408084T2 (de)
ES (1) ES2113029T3 (de)
IT (1) IT1264720B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005861A1 (de) * 1996-08-02 1998-02-12 Robert Bosch Gmbh Brennstoffeinspritzventil und verfahren zur herstellung
WO1999040315A1 (en) * 1998-02-05 1999-08-12 Siemens Automotive Corporation Non-magnetic shell for welded fuel injector
WO2002038942A1 (de) * 2000-11-10 2002-05-16 Siemens Aktiengesellschaft Injektor zum einspritzen von kraftstoff in einen brennraum
EP3301293A1 (de) * 2016-09-30 2018-04-04 Continental Automotive GmbH Langer injektor für einen verbrennungsmotor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6939178B2 (en) * 2003-12-31 2005-09-06 Amphenol Corporation Fuel injector connector

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB804116A (en) * 1955-10-12 1958-11-05 Cav Ltd Liquid fuel injection nozzles for internal combustion engines
JPS59203866A (ja) * 1983-05-04 1984-11-19 Nippon Denso Co Ltd 電磁式燃料噴射弁
EP0536774A1 (de) * 1991-10-11 1993-04-14 WEBER S.r.l. Elektromagnetisch betätigbares Kraftstoff-Zerstäubung- und Dosierventil mit sehr kleinen Ausmassen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB804116A (en) * 1955-10-12 1958-11-05 Cav Ltd Liquid fuel injection nozzles for internal combustion engines
JPS59203866A (ja) * 1983-05-04 1984-11-19 Nippon Denso Co Ltd 電磁式燃料噴射弁
EP0536774A1 (de) * 1991-10-11 1993-04-14 WEBER S.r.l. Elektromagnetisch betätigbares Kraftstoff-Zerstäubung- und Dosierventil mit sehr kleinen Ausmassen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 73 (M - 368) 3 April 1985 (1985-04-03) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005861A1 (de) * 1996-08-02 1998-02-12 Robert Bosch Gmbh Brennstoffeinspritzventil und verfahren zur herstellung
WO1999040315A1 (en) * 1998-02-05 1999-08-12 Siemens Automotive Corporation Non-magnetic shell for welded fuel injector
WO2002038942A1 (de) * 2000-11-10 2002-05-16 Siemens Aktiengesellschaft Injektor zum einspritzen von kraftstoff in einen brennraum
EP3301293A1 (de) * 2016-09-30 2018-04-04 Continental Automotive GmbH Langer injektor für einen verbrennungsmotor

Also Published As

Publication number Publication date
ITBO930424A0 (it) 1993-10-26
EP0649983B1 (de) 1998-01-21
DE69408084T2 (de) 1998-06-10
DE69408084D1 (de) 1998-02-26
IT1264720B1 (it) 1996-10-04
ES2113029T3 (es) 1998-04-16
ITBO930424A1 (it) 1995-04-26

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