EP0347914B1 - Elektromagnetisches Kraftstoffdosier- und Kraftstoffzerstäubungsventil - Google Patents

Elektromagnetisches Kraftstoffdosier- und Kraftstoffzerstäubungsventil Download PDF

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Publication number
EP0347914B1
EP0347914B1 EP89111393A EP89111393A EP0347914B1 EP 0347914 B1 EP0347914 B1 EP 0347914B1 EP 89111393 A EP89111393 A EP 89111393A EP 89111393 A EP89111393 A EP 89111393A EP 0347914 B1 EP0347914 B1 EP 0347914B1
Authority
EP
European Patent Office
Prior art keywords
hole
axial
cavity
fuel
armature
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.)
Expired - Lifetime
Application number
EP89111393A
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English (en)
French (fr)
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EP0347914A1 (de
Inventor
Francesco Morini
Massimo Lolli
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
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Filing date
Publication date
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Publication of EP0347914A1 publication Critical patent/EP0347914A1/de
Application granted granted Critical
Publication of EP0347914B1 publication Critical patent/EP0347914B1/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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • 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
    • F02M51/0671—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 having an elongated valve body attached thereto
    • F02M51/0675—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 having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—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 having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • 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

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 cylindrical supporting body having a first axial cavity housing an electromagnet, and an axial hole communicating with said cavity and housing an axially-sliding anchor integral with a mobile plugging member.
  • Said valves also comprise a nozzle secured to and projecting axially from the supporting body, and in which is formed a fuel outlet hole communicating with said axial cavity and controlled by said plugging member. This is designed to move, by virtue of said electromagnet, between a first closed position wherein it is pushed by a spring against a seat on the nozzle, thus closing the fuel outlet hole, and an open position wherein the fuel outlet hole is opened.
  • Said valves present a duct for feeding the fuel (piped to the valve) into a chamber communicating with said fuel outlet hole.
  • Said fuel duct usually comprises an axial hole through the core and anchor on the valve, and further passages formed between further members and said supporting body and nozzle. On said valves, therefore, fuel is fed into said chamber along a duct orignating at the top end and extending along the entire axial length of the valve.
  • a major drawback of known valves of the aforementioned type is the formation of fuel vapours inside the fuel duct, which results in impaired operation of the valve in terms of metering and atomizing performance. This is particularly noticeable when operating with high-temperature fuel, as when the vehicle is left in the sun for prolonged periods of time.
  • the pressure at which the fuel is fed into the chamber communicating with the fuel supply hole is not strictly constant, and rarely corresponds to the set pressure.
  • the fuel supply circuit to the valve presents a pressure regulator for maintaining substantially constant fuel supply pressure.
  • the pressure inside the chamber differs from that of said upstream portion due to the resistance encountered by the fuel in the duct portion formed inside the valve.
  • valves failure of such valves to provide for strictly constant fuel pressure, corresponding to the set pressure, immediately upstream from the fuel outlet hole, invariably results, as already state, in impaired metering and atomising performance.
  • the chamber formed inside the valve, immediately upstream from the fuel outlet hole is supplied with fuel through holes formed inside a portion of the nozzle close to the chamber itself.
  • a valve of this type is described in JP-A-60/79154; this valve comprises a series of holes disposed in the lateral wall of the nozzle and designed to feed the fuel to the outlet hole of the valve and a series of holes disposed in the cylindrical body of the valve and designed to discharge the unemployed fuel and a small part of fuel vapours.
  • valves of the aforementioned type fail to provide a solution to the drawbacks caused by the formation of fuel vapours.
  • valves of this sort featuring fuel outlet holes on the nozzle involve fairly complex machining operations, thus resulting in high manufacturing cost of the valve as a whole.
  • the aim of the present invention is to provide an electromagnetic fuel metering and atomising valve for an internal combustion engine fuel supply device which includes a fuel supply duct, said valve comprising: a substantially cylindrical supporting body having an external lateral surface, a first axial cavity, and a first axial hole, said first axial cavity being in communication with said first axial hole, said supporting body having an electromagnet and a core disposed within said first axial cavity, said supporting body having an armature partially disposed in said first axial hole and partially disposed in said first axial cavity; said core and said armature being substantially tubular in order to define respective cavities in which is housed a spring; a nozzle secured to and projecting axially from said supporting body, said nozzle including a seat, an outlet hole in communication with said first axial cavity, a second axial hole, and a sliding rod with an integral mobile plugging member
  • valve according to the present invention will be described by way of example with reference to the accompanying drawing showing an axial section of the same.
  • the valve according to the present invention comprises a supporting body 1 defined by a substantially cylindrical lateral surface 2, and having a first axial cavity 3 housing an electromagnet 4, and an axial hole communicating with said cavity 3.
  • Axial hole 6 on electromagnet 4 houses a core 7, while axial hole 5 houses an axially-sliding anchor 8 integral with a mobile plugging member 9.
  • Supporting body 1 is fitted with a nozzle 12 in which is formed a fuel outlet hole 13 controlled by plugging member 9.
  • plugging member 9 is conveniently integral with a rod 14 sliding axially inside a cylindrical seat 15 on nozzle 12, and guided by a pair of annular projections 16 on which are formed flat portions 17, each defining a fuel passage together with the cylindrical surface of seat 15.
  • a spacer 18 is fitted between nozzle 12 and body 1, and nozzle 12 is secured to body 1 by permanently deforming the annular end edge 19 of body 1.
  • Anchor 8 is substantially tubular and secured to rod 14, e.g. by permanently deforming the end of anchor 8.
  • a helical spring 20 having one end resting on a push rod 22 force-fitted inside an axial hole 23 on core 7, and designed to normally maintain plugging member 9 against a seat 24 upstream from fuel outlet hole 13.
  • supporting body 1 presents a series of holes 25 designed to enable external communication of axial hole 5 through lateral surface 2 of body 1. As shown in the drawing, said holes 25 consist of radial holes coming out inside cavity 3 of body 1.
  • Spacer 18 presents a slot 30 for connecting axial hole 5 to seat 15 inside nozzle 12 and, consequently, to fuel outlet hole 13.
  • the end of rod 14 presents at least one hole 31 for connecting the hole in anchor 8 to seat 15 of nozzle 12.
  • body 1 and part of nozzle 12 are conveniently covered by a plastic casing 35 having holes corresponding with holes 25. Between cover 35 and body 1, there is provided a mesh filter 36.
  • the valve also comprises known electrical connecting members 38 for supplying electromagnet 4, a cap 39 for nozzle 12, and a sealing ring 40.
  • the valve according to the present invention operates as follows.
  • the valve according to the present invention When connected to a fuel circuit of the type shown in the drawing, the valve according to the present invention is housed inside a substantially cylindrical seat 45 having a hole 46 communicating with the manifold supplying the mixture to the engine.
  • a substantially cylindrical seat 45 having a hole 46 communicating with the manifold supplying the mixture to the engine.
  • pressure is exerted on the surface of hole 46 by sealing ring 40 which, together with a further sealing ring 48 between the valve and seat 45, seals the fuel inside seat 45.
  • Fuel is fed into seat 45 along a duct 49 preferably located in line with holes 25, and is drained from seat 45 by a further duct 50.
  • the fuel supplied by duct 49 is maintained at a predetermined pressure by a pressure regulator (not shown) on the fuel circuit upstream from duct 49.
  • the incoming fuel from duct 49 therefore fills seat 45 and enters the valve through holes 25, as shown by the black and white arrows in the drawing.
  • a first stream of fuel through holes 25 flows into cavity 3 and, through the hole in anchor 8 and the openings formed between anchor 8, core 7, body 1, spacer 18 and slot 30, into seat 15 on nozzle 12, and from there through the cavities formed between the flat portions of annular projections 16 and the surface of seat 15 to outlet hole 13.
  • a second stream of fuel through holes 25 flows into cavity 3 and, via the openings between core 7, anchor 8 and the surfaces of hole 5 in body 1 and hole 6 in electromagnet 4, flows over the outer surfaces of all the members inside cavity 3 and axial hole 5, and out along duct 50.
  • the presence of radial hole 32 in core 7 facilitates said passage.
  • Said first stream of fuel therefore substantially supplies outlet hole 13 along said route inside the valve, the reduced length and, consequently, reduced resistance of which provide for minimal load losses, so that the fuel at outlet hole 13 presents substantially the same pressure as inside supply duct 49.
  • said second stream of fuel flows through all the openings and holes inside body 1, particularly those at the top of the valve, thus providing for effective scavenging of any vapours formed inside the same.
  • valve according to the present invention has been found to overcome the drawbacks typically associated with known substantially axial fuel feed type valves, wherein the metering and atomizing efficiency of the valve is seriously impaired by the formation of vapours particularly at the top of the valve. Moreover, metering and atomizing performance is improved by virtue of the high, substantially constant fuel pressure maintained immediately upstream from outlet hole 13.

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)

Claims (1)

  1. Elektromagnetisches Kraftstoffdosier- und Kraftstoffzerstäubungsventil für die Kraftstoffzufuhrvorrichtung einer Brennkraftmaschine mit einem Kraftstoffzuleitungskanal (49), wobei das Ventil umfaßt:
    einen im wesentlichen zylindrischen Trägerkörper (1) mit einer äußeren Seitenfläche (2), einem ersten axialen Hohlraum (3) und einem ersten axialen Loch (5), wobei der erste axiale Hohlraum mit dem ersten axialen Loch in Verbindung steht, wobei der Trägerkörper mit einem Elektromagnet (4) und einem innerhalb des ersten axialen Hohlraums angeordneten Kern (7) versehen ist, wobei der Trägerkörper einen teilweise in dem ersten axialen Loch und teilweise in dem ersten axialen Hohlraum (3) angeordneten Anker (8) aufweist, wobei der Kern und der Anker im wesentlichen rohrförmig sind, um jeweils Hohlräume zu bilden, in denen eine Feder (20) untergebracht ist;
    eine Düse (12), die an dem Trägerkörper befestigt ist und axial von diesem absteht, wobei die Düse einen Sitz (24) ein mit dem ersten axialen Hohlraum (3) in Verbindung stehendes Auslaßloch (9), ein zweites axiales Loch (15) und eine Gleitstange (16) mit einem einstückig angeformten bewegten Verschlußglied in dem zweiten axialen Loch (15) enthält, wobei die Gleitstange mit dem Anker verbunden ist; und
    ein Abstandsstück (18), das zwischen dem Trägerkörper und der Düse angeordnet ist, wobei das Abstandsstück die Düse trägt und einen radialen Schlitz (30) aufweist, der mit dem ersten (5) und dem Zweiten (15) axialen Loch und dem Sitz in Verbindung steht;
    wobei das Verschlußglied mit Hilfe des Elektromagnets zwischen einer ersten geschlossenen Position, in der das Verschlußglied von der Feder gegen den Sitz (24) gestoßen wird und dadurch das Auslaßloch verschließt, und einer zweiten offenen Position, in der das Auslaßloch offen ist, bewegt wird;
    wobei der Trägerkörper eine Reihe von radialen Löchern (25) enthält, die über der Seitenfläche angeordnet sind und mit dem ersten axialen Hohlraum (3) in Verbindung stehen, wodurch für einen ersten Kraftstofffluß zwischen dem ersten axialen Hohlraum (3) und dem Kraftstoffzuleitungskanal (29) gesorgt wird;
    gekennzeichnet durch die Tatsache, daß die Stange (16) wenigstens ein Loch (31) enthält, das den Hohlraum in dem Anker (8) mit dem zweiten axialen Loch (15) verbindet, und daß der Kern (7) wenigstens ein radiales Loch (32) aufweist, wodurch für einen zweiten Kraftstofffluß gesorgt wird, der von der Reihe von radialen Löchern (25) kommt und durch das radiale Loch (32) und die in dem Anker (8) gebildeten Hohlräume und dem Kern (7) verläuft und aus dem Loch (31) erfolgt, das den Hohlraum in dem Anker (8) mit dem zweiten axialen Loch (15) verbindet, wodurch der zweite Fluß Dämpfe aus dem Hohlraum in dem Anker (8) ausspült.
EP89111393A 1988-06-23 1989-06-22 Elektromagnetisches Kraftstoffdosier- und Kraftstoffzerstäubungsventil Expired - Lifetime EP0347914B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67589/88A IT1219396B (it) 1988-06-23 1988-06-23 Valvola per la dosatura e la polverizzazione di carburante ad azionamento elettromagnetico provvista di fori laterali di ingresso del carburante
IT6758988 1988-06-23

Publications (2)

Publication Number Publication Date
EP0347914A1 EP0347914A1 (de) 1989-12-27
EP0347914B1 true EP0347914B1 (de) 1994-03-02

Family

ID=11303672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89111393A Expired - Lifetime EP0347914B1 (de) 1988-06-23 1989-06-22 Elektromagnetisches Kraftstoffdosier- und Kraftstoffzerstäubungsventil

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Country Link
EP (1) EP0347914B1 (de)
DE (1) DE68913368T2 (de)
ES (1) ES2051932T3 (de)
IT (1) IT1219396B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2050452A1 (en) * 1990-11-19 1992-05-20 John C. Hickey Integrally formed fuel rail/injectors and method for producing
US8434457B2 (en) 2010-06-29 2013-05-07 Caterpillar Inc. System and method for cooling fuel injectors

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2553834B1 (fr) * 1983-10-20 1988-02-26 Sibe Soupape d'injection pour moteur a combustion interne
DE3408012A1 (de) * 1984-03-05 1985-09-05 Gerhard Dipl.-Ing. Warren Mich. Mesenich Elektromagnetisches einspritzventil
DE3602956A1 (de) * 1986-01-31 1987-08-06 Vdo Schindling Elektromagnetisch betaetigbares kraftstoffeinspritzventil
IT1187924B (it) * 1986-02-19 1987-12-23 Weber Spa Valvola ad azionamento elettromagnetico per la dosatura e la polverizzazione del carburante per un dispositivo di alimentazione di un motore a combustione interna
GB2198589B (en) * 1986-11-15 1990-09-12 Hitachi Ltd Electromagnetic fuel injector
IT1211159B (it) * 1987-06-09 1989-09-29 Weber Srl Valvola per la dosatura e la polverizzazione di carburante per un dispositivo ad iniezione del carburante in un motore acombustione interna

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts fo Japan, vol. 11, no. 397 (M-655) (2844) 25 December 1987 *

Also Published As

Publication number Publication date
EP0347914A1 (de) 1989-12-27
ES2051932T3 (es) 1994-07-01
DE68913368D1 (de) 1994-04-07
IT1219396B (it) 1990-05-11
DE68913368T2 (de) 1994-06-01
IT8867589A0 (it) 1988-06-23

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