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EP0357498B1 - Kraftstoffeinspritzvorrichtung mit einer Belüftungskammer - Google Patents

Kraftstoffeinspritzvorrichtung mit einer Belüftungskammer Download PDF

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Publication number
EP0357498B1
EP0357498B1 EP89402348A EP89402348A EP0357498B1 EP 0357498 B1 EP0357498 B1 EP 0357498B1 EP 89402348 A EP89402348 A EP 89402348A EP 89402348 A EP89402348 A EP 89402348A EP 0357498 B1 EP0357498 B1 EP 0357498B1
Authority
EP
European Patent Office
Prior art keywords
cap
nose
injector
passage
air
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
EP89402348A
Other languages
English (en)
French (fr)
Other versions
EP0357498A1 (de
Inventor
Roger Labouesse
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.)
Solex SA
Original Assignee
Solex SA
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 Solex SA filed Critical Solex SA
Publication of EP0357498A1 publication Critical patent/EP0357498A1/de
Application granted granted Critical
Publication of EP0357498B1 publication Critical patent/EP0357498B1/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
    • F02M61/18—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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
    • 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
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • 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

Definitions

  • the invention relates to fuel injection devices for an internal combustion engine; it finds a particularly important application in the injection devices for so-called "multi-point" systems, in which each combustion chamber of the engine is provided with an injection device which opens in the vicinity of the corresponding intake valve.
  • the nozzle of the injector is placed near the combustion chamber of the engine which tends to bring it to high temperature, which results in fouling of the nose by the products or additives contained in the fuel supplied. by the injector.
  • the invention aims to provide an injection device provided with a thermal protection cap, of the kind defined above, having improved fuel atomization characteristics at idle and at low engine loads, by air supply, and whose aeration chamber has well defined dimensions, and this by using only very simple means.
  • the invention proposes in particular a device in accordance with the characterizing part of claim 1.
  • the cap may have an opening significantly greater than that of a normal thermal protection cap: in this case, it is the central hole of the plate which has a diameter just sufficient to allow the jet of jet to pass through to the intake valve. fuel supplied by the injector, when the latter provides a single central jet.
  • the cap can be a simple molded piece of insulating plastic and the spacer plate can be a simple piece of shaped sheet metal.
  • the injection device 10 shown in FIG. 1 is fixed to the intake manifold 12 of an engine so as to project a jet of fuel towards an intake valve 14.
  • the injector is placed in a passage formed in the tubing 12 and opening onto the cylinder head. It can be viewed as comprising a rear body 16 connected to a fuel supply line 18 and to a connector 19 and a nose 20 of reduced diameter.
  • An O-ring 22 carried by the nose 20 of the injector bears against the wall of the passage formed in the tube 12 and separates said tube in a leaktight manner from the ambient atmosphere.
  • a fuel spouting channel 24 closable by a needle 26 whose movements are controlled by an electromagnetic coil housed in the body and not shown.
  • the needle is extended by a stud 28 of diameter smaller than that of the channel 24 and protruding from it, so that the fuel spurts in the passage limited by the channel 24 and the stud 28.
  • a cap 30 On the nose 20 of the injector is fitted a cap 30, generally made of insulating plastic. An internal circumferential rib 32 of this cap is provided for snapping into a groove 34 of the nozzle nose in order to lock the cap in a location such that an aeration chamber 38 remains between the nose and the bottom of the cap. .
  • the cap is pierced with a central opening 36 of sufficient diameter to allow the free exit of the jet of fuel supplied by the injector.
  • the chamber 38 is supplied with air, for example from the engine supply air inlet.
  • the side vents 40 of the cap four in number in the embodiment shown in Figures 2 and 3, communicate the aeration chamber 38 with an annular space 42 delimited in the passage of the tubing by the cap 30, the O-ring 22 and a second O-ring 44 trapped in the groove of the cap.
  • the annular space communicates with the air intake of the engine by a channel 46 formed in the tube and by a pipe 48 ( Figure 1).
  • a spacer plate 50 is disposed between the bottom of the cap 30 and the nose 20 of the injector.
  • This plate makes it possible to precisely adjust the spacing between the bottom of the cap and the nose.
  • it comprises several bosses 52, four in number in the embodiment shown in Figures 2 and 4, pressing against the nose, and a peripheral part intended to rest on the bottom of the cap via 'An O-ring 54.
  • This seal seals the connection between the spacer plate and the cap.
  • its elasticity keeps the bosses 52 applied against the nose 20.
  • the plate 50 is pierced with a calibrated central hole 56 surrounding the end of the stud with which it constitutes a calibrated passage for leaving the jet of fuel and air coming from. from the room. We see in Figure 2 that this arrangement leads to provide in the cap 30 an opening 36 of larger diameter, so as not to disturb the spraying of the fuel sent to the engine.
  • aeration air is sucked through the channel 46, the annular space 42, the vents 40 and the aeration chamber 38. This air mixes with the fuel and ensures that spraying remains satisfactory at idle and at low engine loads.
  • the cooling by the current of fresh air which sweeps the nose of the injector has an effect which is added to the thermal insulation provided by the cap 30 and the plate. spacer 50 and reduces the heating and fouling of the injector.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (4)

1. Einspritzvorrichtung umfassend eine elektrisch gesteuerte Einspritzeinrichtung mit: einem Körper, versehen mit Befestigungseinrichtungen in einem Durchlaß, der in einen Rohransatz mündet und eine Nase (20) mit vermindertem Durchmesser aufweist; einer Verschlußkappe (30) mit der Nase (20) der Einspritzeinrichtung eingepaßt, durchbohrt von einer Öffnung (36) zum Herauslassen des Kraftstoffstrahls, der durch die Einspritzeinrichtung abgegeben wird, wobei die Verschlußkappe unter der Nase der Einspritzeinrichtung in einer Stellung befestigt ist, so daß sie mit ihr eine Belüftungskammer (38) begrenzt und von seitlichen Einlässon (40) durchbohrt ist, zum Erstellen einer Verbindung der Belüftungskammer (38) mit einem Raum (42), der zwischen der Verschlußkappe und der Wandung des Durchlasses in dem Rohransatz angeordnet und mit einer Luftzuführung verbunden ist, und einer zwischen der Verschlußkappe (30) und der Nase (20) angeordneten stegplatte (50), die durchbohrt ist, um einen genau bemessenen Durchlaß zum Herauslassen des Kraftstoffstrahls und der Luft vorzusehen, dadurch gekennzeichnet, daß die stegplatte (50) eine Anlageleiste, die bestimmt ist zum Anlegen an den Boden der Verschlußkappe unter Zwischenlage einer wulstförmigen Dichtung (54), und Anlagehöcker (52) hat zum Anliegen auf der Nase der Einsgritzeinrichtung, um den Abstand zwischen dem Boden der Verschlußkappe und der Nase festzulegen.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Raum (42) ringförmig ist und begrenzt ist durch die Verschlußkappe, durch die Wandung des Durchlasses in dem Rohransatz und durch die wulstförmigen Dichtungen (22, 44) in Anlage an der Wandung, die jeweils durch die Nase und an der Verschlußkappe gebildet werden.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß Einrichtungen zum Einklinken der Verschlußkappe auf der Nase der Einspritzeinrichtung durch eine innere Umfangsrippe (32) 4er Verschlußkappe ausgebildet sind, die bestimmt ist zum Einfügen in eine Vertiefung (34) der Nase (20).
4. Vorrichtung nach dem Anspruch 1, 2 oder 3 dadurch gekennzeichnet, daß die Stegplatte (50) durch ein geformtes Blechteil ausgebildet ist,
EP89402348A 1988-08-30 1989-08-28 Kraftstoffeinspritzvorrichtung mit einer Belüftungskammer Expired - Lifetime EP0357498B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8811376A FR2635827B1 (fr) 1988-08-30 1988-08-30 Dispositif d'injection de combustible a chambre d'aeration
FR8811376 1988-08-30

Publications (2)

Publication Number Publication Date
EP0357498A1 EP0357498A1 (de) 1990-03-07
EP0357498B1 true EP0357498B1 (de) 1992-07-29

Family

ID=9369607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402348A Expired - Lifetime EP0357498B1 (de) 1988-08-30 1989-08-28 Kraftstoffeinspritzvorrichtung mit einer Belüftungskammer

Country Status (5)

Country Link
US (1) US4957241A (de)
EP (1) EP0357498B1 (de)
JP (1) JP2667017B2 (de)
DE (1) DE68902289T2 (de)
FR (1) FR2635827B1 (de)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4004897C1 (en) * 1990-02-16 1991-06-06 Robert Bosch Gmbh, 7000 Stuttgart, De IC engine fuel charge feed - has mix injection orifice coaxial to valve axis in base of sleeve
DE4014245A1 (de) * 1990-05-04 1991-11-07 Bosch Gmbh Robert Vorrichtung zur einspritzung eines brennstoff-gas-gemisches
DE4019752A1 (de) * 1990-06-21 1992-01-02 Bosch Gmbh Robert Brennstoffeinspritzventil
US5220900A (en) * 1991-02-07 1993-06-22 Siemens Automotive L.P. Air assist atomizer for fuel injector
DE4104020A1 (de) * 1991-02-09 1992-08-13 Bosch Gmbh Robert Vorrichtung zur einspritzung eines brennstoff-gas-gemisches
US5449120A (en) * 1991-06-11 1995-09-12 Nippondenso Co., Ltd. Fuel feed apparatus of internal combustion engine
DE4129834A1 (de) * 1991-09-07 1993-03-11 Bosch Gmbh Robert Vorrichtung zur einspritzung eines brennstoff-gas-gemisches
US5174505A (en) * 1991-11-01 1992-12-29 Siemens Automotive L.P. Air assist atomizer for fuel injector
DE4205709A1 (de) * 1992-02-25 1993-08-26 Bosch Gmbh Robert Gasverteiler fuer brennstoffeinspritzanlagen
DE4312756A1 (de) * 1993-04-20 1994-10-27 Bosch Gmbh Robert Vorrichtung zur Einspritzung eines Brennstoff-Gas-Gemisches
DE4415992A1 (de) * 1994-05-06 1995-11-09 Bosch Gmbh Robert Brennstoffeinspritzventil
DE4416610A1 (de) * 1994-05-11 1995-11-16 Bosch Gmbh Robert Brennstoffeinspritzventil
DE4431044A1 (de) 1994-09-01 1996-03-07 Bosch Gmbh Robert Gasverteilereinrichtung für Brennstoffeinspritzanlagen
DE19503269A1 (de) * 1995-02-02 1996-08-08 Bosch Gmbh Robert Brennstoffeinspritzventil für Brennkraftmaschinen
DE69612135T2 (de) * 1995-05-19 2001-09-06 Siemens Automotive Corp., Auburn Hills Luftunterstütztereinspritzventil und Umfassungsbuchse des Ventils
US5785251A (en) * 1995-06-27 1998-07-28 Siemens Automotive Corporation Air assist fuel injector
DE19827136A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Brennstoffeinspritzventil
US20090235898A1 (en) * 2008-03-19 2009-09-24 Short Jason C Fuel injector isolator
JP6376655B2 (ja) * 2014-09-17 2018-08-22 ダイハツ工業株式会社 内燃機関

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1189160A (fr) * 1956-09-10 1959-09-30 Gen Motors Corp Injecteur pour moteurs à combustion interne
DE2038646A1 (de) * 1970-08-04 1972-03-16 Bosch Gmbh Robert Elektromagnetisch betaetigbares Einspritzventil fuer Saugrohreinspritzanlagen
JPS50109023U (de) * 1974-02-19 1975-09-06
FR2281506A1 (fr) * 1974-08-06 1976-03-05 Motobecane Ateliers Support d'injecteur pour moteurs a injection directe
DE2641377A1 (de) * 1976-09-15 1978-03-16 Kloeckner Humboldt Deutz Ag Zylinderkopf fuer eine hubkolbenbrennkraftmaschine
JPS5482528A (en) * 1977-12-14 1979-06-30 Toyota Motor Corp Engine air-fuel-mixture supply system
JPS5543269A (en) * 1978-09-22 1980-03-27 Toyota Central Res & Dev Lab Inc Intermittent gas injection valve
DE3135878C2 (de) * 1981-09-10 1993-10-28 Bosch Gmbh Robert Vorrichtung zur Kühlung eines an einer Brennkraftmaschine mit einem Luftansaugrohr angeordneten Kraftstoffeinspritzventiles
JPS58195058A (ja) * 1982-05-07 1983-11-14 Toyota Motor Corp 燃料噴射式内燃機関のエアアシスト装置
JPS59131575U (ja) * 1983-02-23 1984-09-04 トヨタ自動車株式会社 電子制御機関用燃料噴射弁
US4836453A (en) * 1988-02-22 1989-06-06 Outboard Marine Corporation Fuel injector with continuous air flow

Also Published As

Publication number Publication date
FR2635827A1 (fr) 1990-03-02
FR2635827B1 (fr) 1993-11-26
US4957241A (en) 1990-09-18
JP2667017B2 (ja) 1997-10-22
DE68902289T2 (de) 1992-12-10
DE68902289D1 (de) 1992-09-03
EP0357498A1 (de) 1990-03-07
JPH02140458A (ja) 1990-05-30

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