EP1391610A1 - Soupape à pointeau et dispositif de dosage comprenant une telle soupape - Google Patents

Soupape à pointeau et dispositif de dosage comprenant une telle soupape Download PDF

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Publication number
EP1391610A1
EP1391610A1 EP02018664A EP02018664A EP1391610A1 EP 1391610 A1 EP1391610 A1 EP 1391610A1 EP 02018664 A EP02018664 A EP 02018664A EP 02018664 A EP02018664 A EP 02018664A EP 1391610 A1 EP1391610 A1 EP 1391610A1
Authority
EP
European Patent Office
Prior art keywords
valve
needle
guide element
valve needle
fuel
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Withdrawn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
EP02018664A
Other languages
German (de)
English (en)
Inventor
Fabrizio Biagetti
Luca Matteucci
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.)
Continental Automotive Italy SpA
Original Assignee
Siemens VDO Automotive SpA
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 Siemens VDO Automotive SpA filed Critical Siemens VDO Automotive SpA
Priority to EP02018664A priority Critical patent/EP1391610A1/fr
Publication of EP1391610A1 publication Critical patent/EP1391610A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the present invention relates to a valve needle for a high-pressure fuel injector, in which axial movement of the valve needle in a valve seat controls opening and closing of a metering opening of the injector, comprising a needle body with a cylindrical upper portion, the needle body having an end part provided with a plunger for closing the metering opening.
  • the present invention further relates to a metering device for dosing pressurized fluids, particularly an injection valve for a fuel injection system in an internal combustion engine, comprising such a valve needle.
  • the fit between the valve needle and its seat presents onerous geometrical and manufacturing requirements. These requirements relate, for example, to the clearances of the sliding motion of the needle in the seat, the coaxial arrangement of the guide elements formed on the injector needle and their seats, and to the cylindrical shape and roughness that must be achieved for the components to function properly.
  • the valve needle is provided with a lower guide element and an upper guide element. Both of these elements have the function to precisely guide the sliding movement of the valve needle in its seat.
  • the upper guide element has further the function to dampen the pressure peaks arising from the opening and closing action of the valve needle, heading upstream to the dynamic sealing area. If not damped, these pressure peaks may damage or even break the bellows separating the fuel space from an actuator chamber at lower pressure. In view of the compact dimensions and the high precision requirements, the manufacturing of such an injector needle is complicated and expensive.
  • valve needle of the above mentioned type which is easier and more economic to manufacture. Especially, this object should be attained while the needle is still precisely guided in its seat and no excessive pressure peaks propagate upstream to the bellows area.
  • valve needle with the features of appended claim 1.
  • Advantageous embodiments of the invention are disclosed in the dependent claims 2 to 5.
  • the invention also contains a metering device for dosing pressurized fluids comprising such a valve needle according to independent claim 6.
  • the valve needle with the features of the preamble of claim 1 has a single guide element surrounding the needle body, the guide element providing a close sliding fit of the valve needle in the valve seat.
  • the invention is thus based on the idea to replace the two guide elements of current designs by a single guide element.
  • This makes it possible to arrange the guide element in a higher position thereby increasing the volume of the fuel accumulation chamber located immediately upstream of the plunger of the valve.
  • upstream of the guide element at the upper end of the needle body there is more space available on the seat of the needle, to accommodate the fuel admission holes.
  • This characteristic not only facilitates stabilization of the flow in the region of the valve body but also simplifies the associated machining, such as the burr removal.
  • the guide element has a polygonal cross section to ensure a precise sliding fit of the valve needle relative to the outer seat and to transfer the fuel under pressure directly into the combustion chamber.
  • a peripheral recess is preferably formed between the single guide element and the plunger to provide a fuel accumulation chamber between the valve needle and the valve seat, wherein the axial extension of the peripheral recess is in the range of 1.6 to 2.5 times the diameter d of the cylindrical portion of the needle body.
  • a large fuel accumulation chamber may thus be formed.
  • the guide element has an axial extension in the range of 4.0 to 5.0 times the diameter d of the cylindrical portion of the needle body to form an elongated single guide element.
  • a metering device for dosing pressurized fluids particularly an injection valve for a fuel injection system in an internal combustion engine, comprises a housing having an end part provided with fuel admission holes leading to an outlet passage terminating with a metering opening, the lower part of the housing forming a valve seat surrounding the outlet passage.
  • Figure 1 illustrates a valve needle 10 for a high-pressure fuel injector according to a specific embodiment of the invention.
  • the needle body 12 of the needle 10 comprises a top portion 18 for making contact with a piezoelectric actuator assembly (not shown), a cylindrical upper portion 14, a portion containing the single guide element 16, a recessed portion 18 and a plunger 20.
  • the needle 10 slides in the outlet passage 30 of the injector which terminates in a metering opening 36.
  • the outlet passage 30 is surrounded by the seat 40 of the valve needle. Pressurized fuel to be injected in an engine cylinder enters the outlet passage 30 via the fuel admission holes 42.
  • the guide element 16 may have a polygonal cross section with four flat surfaces 161 separated by rounded portions 163 that provide the close sliding fit of the valve needle 10.
  • the single guide element 16 is arranged in a higher position compared to conventional designs with two guide elements. Thereby, the volume of the fuel accumulation chamber 34 located immediately upstream of the plunger 20 of the valve can be increased.
  • Figure 3 shows an alternative shape of the cross section of the guide element 16, with three flat surfaces 161 separated by rounded portions 163. Again, the rounded portion 163 provide a close sliding fit of the valve needle 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02018664A 2002-08-20 2002-08-20 Soupape à pointeau et dispositif de dosage comprenant une telle soupape Withdrawn EP1391610A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02018664A EP1391610A1 (fr) 2002-08-20 2002-08-20 Soupape à pointeau et dispositif de dosage comprenant une telle soupape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02018664A EP1391610A1 (fr) 2002-08-20 2002-08-20 Soupape à pointeau et dispositif de dosage comprenant une telle soupape

Publications (1)

Publication Number Publication Date
EP1391610A1 true EP1391610A1 (fr) 2004-02-25

Family

ID=30775824

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02018664A Withdrawn EP1391610A1 (fr) 2002-08-20 2002-08-20 Soupape à pointeau et dispositif de dosage comprenant une telle soupape

Country Status (1)

Country Link
EP (1) EP1391610A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161743A (en) * 1986-10-24 1992-11-10 Nippondenso Co., Ltd. Electromagnetic fuel injection valve for internal combustion engine
EP0867611A1 (fr) * 1997-03-26 1998-09-30 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Buse d'injection de combustible pour un moteur à combustion interne
US6363913B1 (en) * 2000-06-09 2002-04-02 Caterpillar Inc. Solid state lift for micrometering in a fuel injector
WO2002038948A1 (fr) * 2000-11-13 2002-05-16 Siemens Vdo Automotive Corporation Compensateur magnetique-hydraulique pour injecteur de carburant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161743A (en) * 1986-10-24 1992-11-10 Nippondenso Co., Ltd. Electromagnetic fuel injection valve for internal combustion engine
EP0867611A1 (fr) * 1997-03-26 1998-09-30 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Buse d'injection de combustible pour un moteur à combustion interne
US6363913B1 (en) * 2000-06-09 2002-04-02 Caterpillar Inc. Solid state lift for micrometering in a fuel injector
WO2002038948A1 (fr) * 2000-11-13 2002-05-16 Siemens Vdo Automotive Corporation Compensateur magnetique-hydraulique pour injecteur de carburant

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