EP0638720A1 - Einspritzdüse mit hoher Zerstäubungskapazität, insbesondere für Kraftstoffversorgung der Fahrzeugmotoren - Google Patents

Einspritzdüse mit hoher Zerstäubungskapazität, insbesondere für Kraftstoffversorgung der Fahrzeugmotoren Download PDF

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Publication number
EP0638720A1
EP0638720A1 EP94111906A EP94111906A EP0638720A1 EP 0638720 A1 EP0638720 A1 EP 0638720A1 EP 94111906 A EP94111906 A EP 94111906A EP 94111906 A EP94111906 A EP 94111906A EP 0638720 A1 EP0638720 A1 EP 0638720A1
Authority
EP
European Patent Office
Prior art keywords
jet
fuel
atomization
respect
casing
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Withdrawn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
EP94111906A
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English (en)
French (fr)
Inventor
Massimo Armaroli
Roberto Consolini
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 EP0638720A1 publication Critical patent/EP0638720A1/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Withdrawn legal-status Critical Current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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/047—Injectors peculiar thereto injectors with air chambers, e.g. communicating with atmosphere for aerating the nozzles
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air

Definitions

  • the present invention relates to an electromagnetically controlled fuel injector, in particular for supplying fuel to motor vehicle engines, of the type in which atomization of the injected fuel is obtained partly by effecting injection through one or more atomizer holes formed through a delivery element designed to provide a so-called "thin wall outflow" and partly by the delivery, through the injector, of an auxiliary air flow in addition to the fuel.
  • Electromagnetic injectors for vehicle engines of the so-called “Pico" type are known, in which the obturator operated by an electromagnetic actuator regulates the outflow of the fuel through holes formed in a portion of a delivery plate or disc defined by a wall of very small thickness, of the order of only a few tenths of a millimetre or less; in this type of injector, atomization of the injected fuel (usually petrol) is achieved by means of the aero- and hydro-dynamic effects which occur, as is well known in rheology, when the outflow of a liquid (the fuel) occurs through a hole formed in a thin wall or through a hole whose length is very small compared to its diameter.
  • the aim of the invention is to provide a fuel injector capable of achieving a high degree of atomization of the injected fuel whilst avoiding the risks of premature wear and/or blockage of the injection holes.
  • a further aim of the invention is to provide an injector which is able to provide a more or less greater degree of atomization by means of the simple addition or replacement of a small number of inexpensive constructional components.
  • a high-capacity atomization injector for supplying fuel to motor vehicle engines, of the type comprising an electromagnetic actuator, a delivery element provided with at least one atomization hole, and an obturator element operated by the said electromagnetic actuator so as to control the formation of at least one jet of fuel through the said atomization hole, characterized in that it is provided with auxiliary atomization means comprising: at least one surface arranged so as to be transversely oblique with respect to the said jet of fuel, at a predetermined and relatively large distance from the atomization hole with respect to the jet diameter, such that the surface is struck by the jet at a predetermined point; and means for delivering a jet of auxiliary air oriented so as to direct the jet of air against the said oblique surface, substantially at the point of impact thereon of the said jet of fuel.
  • the said auxiliary atomization means are all contained in a cap mounted removably on the outside of the injector casing, in the region of and axially projecting from one end of the latter provided with atomizaton hole(s) and the associated delivery element.
  • a fuel injector is denoted in its entirety by 1, said injector, which is intended in particular for supplying fuel to motor vehicle engines, comprising a casing 2 of the known type inside which there is defined a fuel supply duct 3 connected to a known attachment union 4 extending outside the casing 2, in line with the latter; the duct 3 ends in the region of a fuel delivery element 5 defined by a disc mounted fluid-tightly, in a known manner, so as to close off a bottom end 6 of the casing 2 opposite the union 4 which defines conversely the top end of the casing itself; the latter has a substantially cylindrical symmetry in accordance with which the duct 3, union 4 and disc 5 are arranged in a substantially coaxial manner.
  • the casing 2 has accommodated inside it an electromagnetic actuator 7 of the known type arranged coaxially in a ring around the duct 3 and operated and powered via a known electric socket 8 which is arranged on the outside of the casing 2 in the vicinity and on one side of the union 4.
  • the actuator 7 is formed by a ferromagnetic armature 9 which is designed to be displaced axially against the action of an opposition spring 10 by operation of the electromagnetic actuator 7 and to which there is integrally fixed, by means of welding in the case in question, an obturator element 11 defined by a metal disc arranged facing and parallel with the disc 5 defining the aforementioned delivery element.
  • the delivery element 5 is of the "thin wall” type since it is provided with a central circular portion 12 ( Figure 2) with a smaller thickness compared to that of the disc 5 as a whole, defined as the end wall of a frustoconical cavity 13 formed in the disc 5 on the opposite side to the obturator 11, i.e. on the outside of the casing 2.
  • the thin wall defined by the portion 12 has, passing through it, at least one pair of atomization holes 14, of the known type, of relatively short length compared to the diameter, opening of which for a predetermined duration is controlled by an axial sliding movement of the obturator 11, in turn operated by the movement of the armature 9.
  • the actuator 7 When the actuator 7 is de-energised, the obturator disc 11 is kept by the spring 10 in fluid-tight contact with the disc 5, thus hydraulically isolating the holes 14 from the duct 3; conversely, when the actuator 7 is energised, the disc 11 is moved away from contact with the disc 5, thereby establishing hydraulic communication between the holes 14 and the duct 3 into which pressurised fuel is supplied through the union 4.
  • the injector 1 comprises moreover auxiliary atomization means for each jet 15, which are formed in an atomizer element 20 arranged immediately downstream, with respect to the direction of delivery of the jets 15, of the delivery element 5, in axial abutment against the latter, on the opposite side to the obturator disc 11.
  • this atomizer element 20 is defined by a cap which is separate from the casing 2 and mounted externally on the casing 2, coaxially with respect to the latter and in the region of the end 6, axially projecting from the end 6 itself; for example, the cap 20 is provided with snap-engagement fastening means (which are known and not shown) cooperating with corresponding means provided on the casing 2, so as to be able to fix the cap 20 on the latter in a removable manner.
  • the auxiliary atomization means of each jet 15 provided on the element 20 comprise at least one surface 21 arranged so as to be transversely oblique with respact to the jet of fuel 15, at a predetermined and relatively large distance from the atomization hole 14 with respect to the diameter of the jet 15, such that the surface 21 is struck by the jet 15 at a predetermined point 22; and means for delivering a jet of auxiliary air 23 oriented so as to direct the jet of air 23 against the oblique surface 21, substantially at the point of impact 22 thereon of the corresponding jet of fuel 15.
  • delivery of the jet of auxiliary air 23 for each jet 15 of fuel is effected by means a respective hole 25 formed so as to pass through the cap 20 in a radial direction, at a predetermined distance in the axial direction from the end 6 of the casing 2.
  • each surface 21 designed to receive the impact of a jet 15 is formed internally in the cap 20, inside a duct 27 for delivering a highly atomized jet 28 of fuel and air; in fact, inside each duct 27 there emerges laterally a corresponding radial hole 25 for a jet of auxiliary air 23 and the holes 23 are oriented obliquely with respect to the axis of symmetry of the casing 2 and in particular converge towards the latter in the direction of delivery of the fuel; furthermore, each surface 21 is arranged so as to be struck by the jet of fuel 15 with an angle of impact other than 0° and 90° and in particular, between these values.
  • the auxiliary air necessary for operation of the injector 1 may be taken in a known manner, not illustrated for the sake of simplicity, from the induction manifold of the engine and conveyed into the holes 25 by means of suitable ducts; in the case in question the radial holes 25 are connected on the outside of the atomizer element 20 to a manifold 38 defined by respective bevels or chamfers 39 formed on the external lateral surface of the element 20 in line with the holes 25 for facilitating (inviting) entry of the air into the latter, and by a corresponding annular chamber 40 formed in the case in question inside a seat 41 for the injector 1, in which the latter is mounted in fluid-tight manner by means of a seal 42 mounted on the cap 20 and a second seal 43 mounted around the casing 2, so that the bevels 39 are kept facing the chamber 40; the latter is in turn connected, in a manner not illustrated for the sake of simplicity, via ducts formed in the cylinder head, to the induction manifold of the engine itself.
  • the manifold 38 may on the other hand be formed as one piece with the injector 1, for example inside the cap 20, and be connected to the induction manifold of the engine via a flexible pipe.
  • the manifold 38 receives during use a flow of auxiliary air of suitable throughput supplied from the induction manifold and directs it inside the holes 25 so as to create the directed jets of air 23 which help form highly atomized jets 28 of fuel which emerge eventually from the injector 1 and are conveyed to the engine via the ducts 27.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP94111906A 1993-08-06 1994-07-29 Einspritzdüse mit hoher Zerstäubungskapazität, insbesondere für Kraftstoffversorgung der Fahrzeugmotoren Withdrawn EP0638720A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930585A IT1260961B (it) 1993-08-06 1993-08-06 Iniettore ad alta capacita' di atomizzazione, in particolare per l'alimentazione di motori di autoveicoli
ITTO930585 1993-08-06

Publications (1)

Publication Number Publication Date
EP0638720A1 true EP0638720A1 (de) 1995-02-15

Family

ID=11411668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111906A Withdrawn EP0638720A1 (de) 1993-08-06 1994-07-29 Einspritzdüse mit hoher Zerstäubungskapazität, insbesondere für Kraftstoffversorgung der Fahrzeugmotoren

Country Status (2)

Country Link
EP (1) EP0638720A1 (de)
IT (1) IT1260961B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997006365A1 (de) * 1995-08-10 1997-02-20 Robert Bosch Gmbh Brennstoffeinspritzventil
WO1997011271A1 (de) * 1995-09-22 1997-03-27 Siemens Aktiengesellschaft Kraftstoff-einspritzvorrichtung
EP0691470B1 (de) * 1994-07-07 2000-11-29 Yamaha Hatsudoki Kabushiki Kaisha Brennkraftmaschine und Verfahren zur Luft-Kraftstoffgemischbildung dafür
FR2919028A1 (fr) * 2007-07-17 2009-01-23 Peugeot Citroen Automobiles Sa Injecteur de carburant pour moteur a explosion, et moteur ainsi equipe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4982716A (en) * 1988-02-19 1991-01-08 Toyota Jidosha Kabushiki Kaisha Fuel injection valve with an air assist adapter for an internal combustion engine
DE4103918A1 (de) * 1990-02-15 1991-08-22 Aisan Ind Mehrloch-einspritzdueseneinrichtung
DE4209154A1 (de) * 1991-03-20 1992-09-24 Hitachi Ltd Kraftstoffeinspritzventil
US5224458A (en) * 1991-10-31 1993-07-06 Aisan Kogyo Kabushiki Kaisha Multi-hole injector with improved atomization and distribution
WO1994002736A1 (en) * 1992-07-16 1994-02-03 Unisia Jecs Corporation Fuel injection valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4982716A (en) * 1988-02-19 1991-01-08 Toyota Jidosha Kabushiki Kaisha Fuel injection valve with an air assist adapter for an internal combustion engine
DE4103918A1 (de) * 1990-02-15 1991-08-22 Aisan Ind Mehrloch-einspritzdueseneinrichtung
DE4209154A1 (de) * 1991-03-20 1992-09-24 Hitachi Ltd Kraftstoffeinspritzventil
US5224458A (en) * 1991-10-31 1993-07-06 Aisan Kogyo Kabushiki Kaisha Multi-hole injector with improved atomization and distribution
WO1994002736A1 (en) * 1992-07-16 1994-02-03 Unisia Jecs Corporation Fuel injection valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691470B1 (de) * 1994-07-07 2000-11-29 Yamaha Hatsudoki Kabushiki Kaisha Brennkraftmaschine und Verfahren zur Luft-Kraftstoffgemischbildung dafür
WO1997006365A1 (de) * 1995-08-10 1997-02-20 Robert Bosch Gmbh Brennstoffeinspritzventil
WO1997011271A1 (de) * 1995-09-22 1997-03-27 Siemens Aktiengesellschaft Kraftstoff-einspritzvorrichtung
FR2919028A1 (fr) * 2007-07-17 2009-01-23 Peugeot Citroen Automobiles Sa Injecteur de carburant pour moteur a explosion, et moteur ainsi equipe

Also Published As

Publication number Publication date
ITTO930585A1 (it) 1995-02-06
IT1260961B (it) 1996-04-29
ITTO930585A0 (it) 1993-08-06

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