EP0101822A1 - 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
EP0101822A1
EP0101822A1 EP83106278A EP83106278A EP0101822A1 EP 0101822 A1 EP0101822 A1 EP 0101822A1 EP 83106278 A EP83106278 A EP 83106278A EP 83106278 A EP83106278 A EP 83106278A EP 0101822 A1 EP0101822 A1 EP 0101822A1
Authority
EP
European Patent Office
Prior art keywords
fuel
injection
discharge hole
nozzle
valve needle
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
EP83106278A
Other languages
German (de)
English (en)
Other versions
EP0101822B1 (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 are used for example in diesel engines with a divided combustion chamber.
  • the special injection characteristics of these injection nozzles with pronounced preliminary and main jets enable low-noise combustion of the injected fuel. It is disadvantageous, however, that the combustion gases from the combustion chamber reach the mouth of the nozzle bore directly, so that the throttle point of the spray orifice is clogged relatively quickly by deposited soot particles from the combustion gases.
  • the arrangement according to the invention with the characterizing features of the main claim has the opposite advantage that no combustion gases can get to or into the throttle gap when the fuel is injected.
  • the combustion gases can penetrate into the protective channel However, they deposit the entrained soot particles from the S injection opening on the walls of the protection channel.
  • the spray jet sucks fuel gases through the side opening or openings as a result of the injector action, thereby preventing the spray jet from depositing on one side of the protective channel and taking on an undesirable shape when small amounts of injection are involved.
  • 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 tapered pin on the valve needle occurs without the provision of a protective channel, which promotes the penetration of soot and prevents its removal.
  • the protective channel is narrowed in a confuser-like manner as seen in the flow direction. This ensures that the spray jet only wets the trailing edge of the protective channel and the hydrocarbon pollutant emission remains within acceptable limits.
  • the side openings of the protection channel are particularly effective when they are closer to the start of the protection channel lie at the end of the combustion chamber.
  • the protective channel is expediently ventilated via at least three uniformly distributed openings which advantageously open tangentially into the protective channel.
  • the protective channel and the lateral openings are formed in a front part fastened to the nozzle body, 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 III-III 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 displaceably mounted b ar.
  • the valve needle 14 has a conical section 16, which forms a valve surface which cooperates with the valve seat 12.
  • the section 16 is followed by a throttle pin 18 which engages with little play through a nozzle bore 20 which, starting from the valve seat 12, leads 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 throttle gap between throttle pin 18 and nozzle bore 20.
  • the throttle pin 18 emerges from 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 throttle gap after closing the valve 12, 14 and gradually clog it.
  • part-load operation it can also happen that the fuel jet separates from the wall of the nozzle bore 20 and the taper pin 19 in the main injection phase.
  • an attachment part 58 is attached to the nozzle body 10 in the injection nozzle according to the invention, which has a central channel 60 through which the sprayed fuel jet passes.
  • the channel 60 has a cylindrical section 62, which is followed by a confuser 64. This ends in a narrow cylindrical ring edge 66 which encloses an outlet opening 68.
  • four transverse bores 70 open tangentially, the function of which is described below.
  • the spray jet entering the channel 60 sucks air or combustion gases through the transverse bores 70 as a result of the injector effect, which are then expelled again through the outlet opening 68 with the spray jet.
  • the spray jet thus receives a larger volume and, if the cross sections of the channel 60 and the transverse bores 70 are appropriately coordinated, fills the cross section of the cross section of the valve at each 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 channel 60 with small injection quantities, which could impair its protective function.
  • the spray jet emerging from channel 60 practically only wets the very narrow ring edge .66 of the wall of the channel, which increases the hydrocarbon School mission 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
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 true EP0101822A1 (fr) 1984-03-07
EP0101822B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314864A1 (fr) * 2001-11-27 2003-05-28 Toyota Jidosha Kabushiki Kaisha Injecteur pour dispositif de purification de gaz d'échappement

Families Citing this family (2)

* 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
JP5811979B2 (ja) 2012-09-24 2015-11-11 株式会社デンソー 燃料噴射弁

Citations (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
FR2147631A5 (fr) * 1971-07-23 1973-03-09 Kraus Werner
FR2344723A1 (fr) * 1976-03-16 1977-10-14 Inst Motorenbau Prof Huber Injecteur pour moteur a combustion avec formation interne du melange

Family Cites Families (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
JPS5510016A (en) * 1978-07-06 1980-01-24 Nissan Motor Co Ltd Fuel injection valve
DE2925187A1 (de) * 1979-06-22 1981-01-08 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen

Patent Citations (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
FR2147631A5 (fr) * 1971-07-23 1973-03-09 Kraus Werner
FR2344723A1 (fr) * 1976-03-16 1977-10-14 Inst Motorenbau Prof Huber Injecteur pour moteur a combustion avec formation interne du melange

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314864A1 (fr) * 2001-11-27 2003-05-28 Toyota Jidosha Kabushiki Kaisha Injecteur pour dispositif de purification de gaz d'échappement

Also Published As

Publication number Publication date
DE3374210D1 (en) 1987-12-03
EP0101822B1 (fr) 1987-10-28
JPS5943963A (ja) 1984-03-12
DE3229190A1 (de) 1984-02-09

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