EP1783359A1 - Verbesserte Steuerventilanordnung - Google Patents

Verbesserte Steuerventilanordnung Download PDF

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Publication number
EP1783359A1
EP1783359A1 EP06251832A EP06251832A EP1783359A1 EP 1783359 A1 EP1783359 A1 EP 1783359A1 EP 06251832 A EP06251832 A EP 06251832A EP 06251832 A EP06251832 A EP 06251832A EP 1783359 A1 EP1783359 A1 EP 1783359A1
Authority
EP
European Patent Office
Prior art keywords
pintle
fuel
fuel injector
spray aperture
support
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Withdrawn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
EP06251832A
Other languages
English (en)
French (fr)
Inventor
Guy Hoffman
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Priority to EP06251832A priority Critical patent/EP1783359A1/de
Publication of EP1783359A1 publication Critical patent/EP1783359A1/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Withdrawn legal-status Critical Current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
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle 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
    • 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
    • F02M61/08—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 opening in direction of fuel flow
    • 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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type

Definitions

  • This invention relates to fuel injectors for internal combustion engines, and in particular outwardly opening solenoid actuated fuel injectors for direct injection of gasoline.
  • One known type of fuel injector is that having an outwardly opening pintle, biased towards the closed position by a spring and opened by an actuator such as a solenoid or piezo-stack.
  • the pintle is typically slidable within upper and lower guides, and its opening is limited by an end stop which is typically the top surface of the upper guide.
  • the pintle Due to packaging constraints of the injector tip, the pintle has to be relatively long. During engine operation the injector housing heats up and expands. The pintle however is cooled by the flow of fuel around it and does not show a similar expansion. The difference in expansion leads to a decrease in stroke, which shifts the fuel delivery characteristic in the lean direction. During engine operation the pintle is typically cooled to the fuel temperature of approximately 50°C, while the injector housing can be heated to a temperature of over 100°C. This temperature difference between the injector housing and the pintle can cause a reduction in pintle stroke of more than 20 ⁇ m.
  • FIG 1 shows diagrammatically a prior art approach to dealing with this problem.
  • the injector has a body 10 and a pintle 12 having an external head 14 which is sealingly engageable with a spray aperture 16 of the body 10.
  • the pintle 12 is axially movable in upper and lower guides 18 and 20 by an actuator 22 such as the armature of a solenoid.
  • a return spring 24 biases the pintle 12 to the closed position.
  • An end stop 26 on the pintle 12 cooperates with the upper surface of the upper guide 18 to limit extension of the pintle 12.
  • a swirler (not seen in Figure 1) is placed in the fuel flow path so as to induce swirling of the fuel, as indicated at 28. This promotes heat transfer between the body 10 and the pintle 12 and thus reduces the temperature differential discussed above.
  • the present invention provides a fuel injector comprising an injector body having a tip portion defining a spray aperture; a pintle extending within the tip portion; guide means within the tip portion guiding the pintle for axial movement between an extended and a retracted position, the pintle having an external head engageable with the spray aperture in said retracted position to seal the spray aperture; resilient means biasing the pintle to said retracted position; actuating means for selectively moving the pintle into said extended position; and an end stop engageable with the pintle to limit the extension of the pintle; and is characterised in that the end stop is mounted on a support extending within the housing from a location adjacent the spray aperture and spaced from the housing so as to be, is use, substantially surrounded by fuel.
  • a support 30 in the form of a tube extends from a location adjacent the spray aperture 16 axially within the body 10.
  • the upper and lower pintle guides 18, 20 are secured to the support 30.
  • the support 30 is cooled by flow of fuel around it with the result that the support 30 and the pintle 12 are at approximately the same temperature.
  • the spacing between the supports 18, 20 is affected by approximately the same thermal expansion and contraction as the pintle 12, and a reduction in pintle stroke is avoided.
  • the support 30 may be provided with apertures 32 above the lower pintle guide 20 to permit fuel to flow both around and inside the support 30.
  • the apertures 32 may be omitted, and apertures (not shown in Figure 2) may be provided below the lower pintle guide 20 to permit fuel to flow as indicated at 34 to the spray aperture 16.

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)
EP06251832A 2005-11-02 2006-03-31 Verbesserte Steuerventilanordnung Withdrawn EP1783359A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06251832A EP1783359A1 (de) 2005-11-02 2006-03-31 Verbesserte Steuerventilanordnung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05256794 2005-11-02
EP06251832A EP1783359A1 (de) 2005-11-02 2006-03-31 Verbesserte Steuerventilanordnung

Publications (1)

Publication Number Publication Date
EP1783359A1 true EP1783359A1 (de) 2007-05-09

Family

ID=37913842

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06251832A Withdrawn EP1783359A1 (de) 2005-11-02 2006-03-31 Verbesserte Steuerventilanordnung

Country Status (1)

Country Link
EP (1) EP1783359A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156414A (en) * 1962-11-30 1964-11-10 Int Harvester Co Fuel injection nozzle
US3249308A (en) * 1962-08-02 1966-05-03 Citroen Sa Andre Fuel injector for internal combustion engines
US3791589A (en) * 1972-03-03 1974-02-12 Gkn Transmissions Ltd Fuel injection apparatus for internal combustion engines
US4653720A (en) * 1985-03-02 1987-03-31 Robert Bosch Gmbh Electromagnetically actuatable fuel injection valve
US5190223A (en) * 1988-10-10 1993-03-02 Siemens Automotive L.P. Electromagnetic fuel injector with cartridge embodiment
US20010030248A1 (en) * 2000-01-12 2001-10-18 Woodward Governor Company Hydraulically actuated fuel injector cartridge and system for high pressure gaseous fuel injection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249308A (en) * 1962-08-02 1966-05-03 Citroen Sa Andre Fuel injector for internal combustion engines
US3156414A (en) * 1962-11-30 1964-11-10 Int Harvester Co Fuel injection nozzle
US3791589A (en) * 1972-03-03 1974-02-12 Gkn Transmissions Ltd Fuel injection apparatus for internal combustion engines
US4653720A (en) * 1985-03-02 1987-03-31 Robert Bosch Gmbh Electromagnetically actuatable fuel injection valve
US5190223A (en) * 1988-10-10 1993-03-02 Siemens Automotive L.P. Electromagnetic fuel injector with cartridge embodiment
US20010030248A1 (en) * 2000-01-12 2001-10-18 Woodward Governor Company Hydraulically actuated fuel injector cartridge and system for high pressure gaseous fuel injection

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