EP0101822B1 - Buse d'injection de carburant pour moteurs à combustion interne - Google Patents

Buse d'injection de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP0101822B1
EP0101822B1 EP19830106278 EP83106278A EP0101822B1 EP 0101822 B1 EP0101822 B1 EP 0101822B1 EP 19830106278 EP19830106278 EP 19830106278 EP 83106278 A EP83106278 A EP 83106278A EP 0101822 B1 EP0101822 B1 EP 0101822B1
Authority
EP
European Patent Office
Prior art keywords
fuel
discharge hole
chamber
nozzle
injection
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
Application number
EP19830106278
Other languages
German (de)
English (en)
Other versions
EP0101822A1 (fr
Inventor
Katsuoki Dipl.-Ing. Itoh
Iwan Komaroff
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0101822A1 publication Critical patent/EP0101822A1/fr
Application granted granted Critical
Publication of EP0101822B1 publication Critical patent/EP0101822B1/fr
Expired 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
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/06—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves being furnished at seated ends with pintle or plug shaped extensions
    • 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

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • Injectors of this type e.g. are known from EP-A-0 020 888, are used in diesel engines with a divided combustion chamber.
  • the special injection characteristics of these injection nozzles with a pronounced pre-jet and main jet enable low-noise combustion of the injected fuel.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that no combustion gases can get into or into the fuel outlet opening when the fuel is injected.
  • the combustion gases can penetrate into the outlet chamber, but they deposit the soot particles carried away on the walls of the outlet chamber away from the fuel outlet opening.
  • the spray jet sucks fuel gases through the side channel or channels, which prevents the spray jet from depositing on one side of the outlet chamber with small injection quantities and taking on an undesirable shape.
  • the conically narrowing section of the outlet opening ensures that the spray jets only wet the edge at the outlet opening of the outlet chamber and the hydrocarbon pollutant emission remains within acceptable limits.
  • the arrangement according to the invention is particularly advantageous in the case of injection nozzles in which the throttle pin of the valve needle is provided on the end face with a taper pin which is smaller in diameter and which, when the valve is fully open, plunges at least a bit into the nozzle bore.
  • a flow separation on the wall of the nozzle bore and of the taper pin on the valve needle occurs without the arrangement of an outlet chamber with small injection quantities, which promotes the penetration of soot and prevents its removal.
  • the side channels of the outlet chamber are particularly effective if they are closer to the beginning of the outlet chamber than to the outlet opening.
  • the outlet chamber is expediently ventilated via at least three evenly distributed channels which advantageously open tangentially into the outlet chamber.
  • the front part is an individual part placed on the nozzle housing, the other parts of the injection nozzle can largely have the conventional structure.
  • FIG. 1 shows a side view of the exemplary embodiment, partly in section
  • FIG. 2 enlarges area A of FIG. 1
  • FIG. 3 shows a section along line 111-111 in FIG. 2.
  • the injection nozzle has a nozzle body 10, in which a valve seat 12 is formed and a valve needle 14 is slidably mounted.
  • the valve needle 14 has a conical section 16, which forms a valve surface which cooperates with the valve seat 12. Closes at section 16 a throttle pin 18 engages, which engages with little play through a nozzle bore 20, which leads from the valve seat 12 to the end face 22 of the nozzle body 10 on the combustion chamber side.
  • a taper pin 19 with a smaller diameter is formed on the throttle pin 18 and is used for shaping the spray jet in the usual use of the injection nozzle.
  • the nozzle body 10 is clamped together with an washer 24 to a nozzle holder 28 by means of a union nut 26.
  • This is provided with a connecting piece 30 for a fuel supply line, which is connected via channels 32, 34, 36, 38 and 40 to a pressure chamber 42 in the nozzle body 10.
  • the pressure chamber 42 is connected to the nozzle bore 20 via the valve seat 12 and in the region of the pressure chamber 42 the valve needle 14 is provided with a pressure shoulder 44.
  • the valve needle 14 has a pin 46 upstream, which projects into a stepped center bore of the intermediate disk 24 and carries a pressure piece 48, via which a closing spring 52 arranged in a chamber 50 of the nozzle holder 28 acts on the valve needle 14 in the closing direction.
  • the force of the closing spring 52 is directed against the pressure of the fuel which it exerts in the annular space 42 on the pressure shoulder 44 of the valve needle 14.
  • the structure described so far corresponds to that of a conventional throttle pin nozzle.
  • a quantity-limited pre-jet first squirts out through the fuel outlet opening, which is formed at the combustion chamber-side opening of the throttle gap between the throttle pin 18 and the nozzle bore 20.
  • the main jet of fuel is sprayed out through the then substantially larger annular gap between the nozzle bore 20 and the taper pin 19.
  • the combustion gases can enter the fuel outlet opening after closing the valve 12, 14 and gradually clog it.
  • the fuel jet separates from the wall of the nozzle bore 20 and the taper pin 19 in the main injection phase. This favors the penetration of soot into the nozzle bore 20 and thereby the premature clogging of the fuel outlet opening, which in turn changes the injection process and worsens engine operation.
  • an attachment part 58 is attached to the nozzle body 10 in the injection nozzle according to the invention, which has a central outlet chamber 60 through which the sprayed fuel jet passes.
  • the outlet chamber 60 has a cylindrical section 62 which is adjoined by a conically narrowing section 64. This ends in a narrow cylindrical ring edge 66 which encloses an outlet opening 68.
  • Four channels 70 open tangentially in section 62, the function of which is described below.
  • the spray jet entering the outlet chamber 60 sucks air or combustion gases out of the combustion chamber through the channels 70 as a result of the injector action, and these are expelled again with the spray jet through the outlet opening 68.
  • the spray jet thus receives a larger volume and, if the cross-sections of the outlet chamber 60 and the channels 70 are appropriately coordinated, fills the cross-section of the cross-section of the at every operating point of the machine and at least approximately over the entire opening stroke of the valve needle 14, with the other parameters determining the injection quantity and the course of the injection Exit opening 68 fully out.
  • the spray jet would deposit on one side of the outlet chamber 60 with small injection quantities, which could impair its protective function.
  • the spray jet emerging from the outlet chamber 60 practically only wets the very narrow ring edge 66, as a result of which an increased hydrocarbon emission is avoided.
  • the proposal according to the invention can be usefully supplemented by keeping the length of the nozzle bore 20 as short as possible.

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

Claims (3)

1. Buse d'injection de carburant pour moteurs à combustion interne, avec un corps de buse, dans lequel est formé un siège de soupape et est guidé un pointeau de soupape mobile, s'ouvrant contre l'écoulement de carburant, soumis à l'action d'un ressort de fermeture et opposé à cet effet à la pression de carburant, qui plonge avec un jeu de laminage dans un alésage de buse raccordé en aval au siège de soupape et limitant une ouverture de sortie de carburant avec la paroi de l'alésage de buse, caractérisée en ce qu'une pièce de raccordement (58) avec une chambre de sortie (60) est disposée en aval de la sortie de carburant, en ce que la chambre de sortie (60) possède une section (62) de forme cylindrique concentrique à l'ouverture de sortie de carburant, qui est raccordée, avec un diamètre plus grand que celui de l'ouverture de sortie de carburant, à la paroi qui possède l'ouverture de sortie de combustible et qui possède une section (64) se rétrécissant coni- quement dans le sens de l'écoulement, qui se raccorde à la section cylindrique (62), qui s'étend jusqu'à l'ouverture de sortie (68) qui est située côté chambre de combustion, en ce qu'au moins un canal (70) s'ouvrant vers la chambre de combustion se jette dans la section cylindrique (62) pour la ventilation de la chambre de sortie (60) et en ce que les sections de la chambre de sortie (60) et du canal (70) sont déterminées entre-elles et par rapport aux paramètres caractérisant le débit d'injection et le déroulement de l'injection, en ce que le jet d'injection remplit complètement l'ouverture de sortie (68) de la chambre de sortie (60), au moins de manière approximative sur l'ensemble de la course d'ouverture du pointeau de soupape (14) et en chaque point de fonctionnement du moteur à combustion interne.
2. Buse d'injection selon la revendication 1, caractérisée en ce qu'au moins trois canaux (70) décalés entre eux de manière régulière sont prévus, qui se jettent dans la chambre de sortie, plutôt au début de la chambre de sortie (60) qu'à l'ouverture de sortie et ce, avantageusement de manière tangentielle.
3. Buse d'injection selon la revendication 1 ou 2, caractérisée en ce que la pièce d'adaptation (58) est une pièce indépendante appliquée sur le corps de buse.
EP19830106278 1982-08-05 1983-06-28 Buse d'injection de carburant pour moteurs à combustion interne Expired EP0101822B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3229190 1982-08-05
DE19823229190 DE3229190A1 (de) 1982-08-05 1982-08-05 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0101822A1 EP0101822A1 (fr) 1984-03-07
EP0101822B1 true EP0101822B1 (fr) 1987-10-28

Family

ID=6170162

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830106278 Expired EP0101822B1 (fr) 1982-08-05 1983-06-28 Buse d'injection de carburant pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0101822B1 (fr)
JP (1) JPS5943963A (fr)
DE (2) DE3229190A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01300057A (ja) * 1988-05-30 1989-12-04 Isuzu Motors Ltd 燃料噴射ノズル
EP1314864B1 (fr) * 2001-11-27 2007-01-03 Toyota Jidosha Kabushiki Kaisha Injecteur pour dispositif de purification de gaz d'échappement
JP5811979B2 (ja) * 2012-09-24 2015-11-11 株式会社デンソー 燃料噴射弁

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1330181A (en) * 1970-09-25 1973-09-12 Petrol Injection Ltd Fuel injection nozzles
EP0007724A1 (fr) * 1978-07-06 1980-02-06 Nissan Motor Co., Ltd. Clapet d'injection
EP0020888A1 (fr) * 1979-06-22 1981-01-07 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1843821A (en) * 1929-09-30 1932-02-02 Joslyn Diesel Engine Company L Fuel atomizing nozzle
CH356636A (de) * 1956-06-15 1961-08-31 Exxon Research Engineering Co Einspritzventil für einen Dieselmotor sowie Verfahren zum Betrieb desselben
DE2137030A1 (de) * 1971-07-23 1973-02-01 Werner Dipl Phys Kraus Kraftstoffeinspritzvorrichtung
DE2610927C2 (de) * 1976-03-16 1983-01-27 Institut für Motorenbau Prof. Huber e.V., 8000 München Einspritzdüse zur Kraftstoffeinspritzung in den Brennraum einer Brennkraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1330181A (en) * 1970-09-25 1973-09-12 Petrol Injection Ltd Fuel injection nozzles
EP0007724A1 (fr) * 1978-07-06 1980-02-06 Nissan Motor Co., Ltd. Clapet d'injection
EP0020888A1 (fr) * 1979-06-22 1981-01-07 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne

Also Published As

Publication number Publication date
EP0101822A1 (fr) 1984-03-07
DE3229190A1 (de) 1984-02-09
DE3374210D1 (en) 1987-12-03
JPS5943963A (ja) 1984-03-12

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