EP1391607A1 - Dosiergerät - Google Patents

Dosiergerät Download PDF

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Publication number
EP1391607A1
EP1391607A1 EP02018663A EP02018663A EP1391607A1 EP 1391607 A1 EP1391607 A1 EP 1391607A1 EP 02018663 A EP02018663 A EP 02018663A EP 02018663 A EP02018663 A EP 02018663A EP 1391607 A1 EP1391607 A1 EP 1391607A1
Authority
EP
European Patent Office
Prior art keywords
fluid
outlet passage
housing
metering device
supply duct
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Withdrawn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
EP02018663A
Other languages
English (en)
French (fr)
Inventor
designation of the inventor has not yet been filed The
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 EP02018663A priority Critical patent/EP1391607A1/de
Publication of EP1391607A1 publication Critical patent/EP1391607A1/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Withdrawn legal-status Critical Current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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • the present invention relates to a metering device for dosing pressurized fluids, particularly an injection valve for a fuel injection system in an internal combustion engine.
  • the metering device is of the type which comprises an axially extending housing having an end part provided with an outlet passage terminating with a metering opening and a fluid inlet for supplying the fluid under pressure arranged at the end part of the housing opposite to the end part provided with the outlet passage, an axially moveable valve needle passing through the outlet passage and controlling opening and closing of the metering opening by its axial movement, a piezoelectric actuator assembly in axial alignment with the valve needle and cooperating with the valve needle to control its axial movement, and a fluid supply duct communicating with the fluid inlet and the outlet passage for transmitting the pressurized fluid to be dosed to the outlet passage.
  • the housing includes a fluid chamber containing the pressurized gasoline which communicates via a line borehole with a fluid inlet.
  • the pressure of the gasoline in such injector valves is of the order of 200 bar. Because of the axial movements of the injector needle as it opens and closes the gap to allow the gasoline into the engine cylinder, the gasoline contained inside the injector is subjected to pressure peaks of between 20% and 50% compared with the above mentioned nominal value. These pressure fluctuations can overload elastic sealings of the valve body, separating the high pressure gasoline chamber from an actuator chamber at a lower pressure.
  • the fluid supply duct forms an axially extended annular supply duct within the housing that extends down to the outlet passage (20).
  • the volume of gasoline proximate to the valve body can be greatly increased, thus damping the pressure peaks arising form the opening/closing actions of the valve needle.
  • Furthermore conducts connecting the supply duct with the outlet passage can easily be made in the outlet passage, e. g. by simply drilling holes in the outlet passage. This enables a cheap and reliable manufacturing process of the metering device.
  • the housing comprises an inner tubular member containing the piezoelectric actuator assembly and an outer tubular member surrounding the inner tubular member and forming the outer jacket of the housing, wherein the fluid supply duct is formed between the inner tubular member and the outer tubular member.
  • annular fluid supply duct extends axially from the fluid inlet of the injector through fluid admission holes to the outlet passage.
  • the annular fluid supply duct extends axially over more than 20%, preferably over more than 30%, more preferably over more than 40% of the axial extension of the housing. This measure ensures a gasoline space of a large volume near the valve body.
  • the fluid inlet is formed by a fluid entry duct, arranged as a separate element at the end part of the housing opposite to the end part provided with the outlet passage.
  • the fluid inlet may be formed by a fluid entry duct integral with the inner tubular member. Thereby the number of parts is reduced and the assembly of the parts is simplified.
  • the housing comprises an outer flange for installing the metering device to a cylinder head of an internal combustion engine.
  • the metering device advantageously comprises spring means for urging the valve needle in the closing position and means for transmitting an axial extension of the piezoelectric actuator assembly to the valve needle to displace the needle from the closing position when activated.
  • Figure 1 shows an injection valve for direct-injection gasoline engines, generally designated by 10.
  • the injection valve has a housing 12, which comprises an outer tubular member 121 and an inner tubular member 123.
  • the outer tubular member 121 forms the outer jacket of the injection valve 10, and the inner tubular member 123 contains the piezoelectric actuator assembly 30.
  • the passage 14 formed between the outer tubular member 121 and the inner tubular member 123 provides a large annular pathway which transports the gasoline supplied by the gasoline entry duct 16 to the gasoline admission holes 28 and into the outlet passage 20 described below.
  • the valve body has an axial outlet passage 20 projecting through the lower part of the housing 12 and terminating in a metering opening 22.
  • the metering opening 22 is surrounded by a valve seat 26 which is opened or closed by the axial movement of the valve needle 24 passing through the outlet passage 20.
  • the closed state of the injection valve 10, where the needle 24 is pressed against the valve seat 26 is provided by the biased pressure of a helical spring 34 which rests on a snap ring 32.
  • a piezoelectric actuator which forms part of the piezoelectric actuator assembly 30 is activated. If an excitation voltage is applied to the piezoelectric actuator, it increases in length in axial direction by a predetermined amount, typically about several tens of micrometers. This extension in length is transmitted to the valve needle 24 which depresses the biasing spring 34 and lifts from the valve seat 26. In this position, the injection of pressurized gasoline in the cylinder starts.
  • a thermal compensator 36 is provided to fix the position of the piezoelectric actuator assembly 30 during fast changes of its length, but compensates for slow changes in the position of the piezoelectric actuator assembly 30 due to, for example, thermal changes.
  • the passage 14 forms a large annular pathway for the gasoline. Because of its large axial and annular extent, the passage 14 has a large volume compared to conventional gasoline supply ducts. The large volume of passage 14 limits the value of the peaks of pressure fluctuations arising from the opening and closing of the metering opening 22. Thus, the provision of the passage 14 leads to a stabilizing effect on the gasoline pressure.
  • FIG. 2 shows another embodiment of an injector 40 according to the invention. Elements which are similar to elements of Fig. 1 are designated by the same reference numerals and their discussion is omitted. While the embodiment of Fig. 1 shows the gasoline entry duct 16 to be a separate element, Fig. 2 shows an embodiment where the gasoline entry duct 161 is integral with the inner tubular member 123. As the inner tubular member 123 and the gasoline entry duct 161 are formed in one piece the number of mechanical parts is reduced. Also, in this embodiment, the thermal compensator 36 is arranged in the lower part of the housing 12, just above the snap ring 32.
  • FIG. 3 A further improvement of the embodiment of Fig. 2 is shown in Fig. 3.
  • the injector 50 has an outer flange 42 for fixing the injector 50 to a cylinder head of an internal combustion engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02018663A 2002-08-20 2002-08-20 Dosiergerät Withdrawn EP1391607A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02018663A EP1391607A1 (de) 2002-08-20 2002-08-20 Dosiergerät

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02018663A EP1391607A1 (de) 2002-08-20 2002-08-20 Dosiergerät

Publications (1)

Publication Number Publication Date
EP1391607A1 true EP1391607A1 (de) 2004-02-25

Family

ID=30775823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02018663A Withdrawn EP1391607A1 (de) 2002-08-20 2002-08-20 Dosiergerät

Country Status (1)

Country Link
EP (1) EP1391607A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1724464A1 (de) * 2005-05-09 2006-11-22 Siemens Aktiengesellschaft Einspritzventil und Ventilgruppe für das Einspritzventil
EP1734253A1 (de) * 2005-06-17 2006-12-20 Siemens Aktiengesellschaft Einspritzventil mit einem Gehäuse und Verfahren zur Herstellung eines Gehäuses
WO2012048999A3 (de) * 2010-10-14 2012-08-16 Robert Bosch Gmbh Vorrichtung zum einspritzen von kraftstoff

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1046809A2 (de) 1999-04-20 2000-10-25 Siemens Aktiengesellschaft Fluiddosiervorrichtung
WO2001006115A1 (de) * 1999-07-14 2001-01-25 Robert Bosch Gmbh Brennstoffeinspritzventil
US6302333B1 (en) * 1998-04-18 2001-10-16 Daimlerchrysler Ag Injector for fuel injector systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6302333B1 (en) * 1998-04-18 2001-10-16 Daimlerchrysler Ag Injector for fuel injector systems
EP1046809A2 (de) 1999-04-20 2000-10-25 Siemens Aktiengesellschaft Fluiddosiervorrichtung
WO2001006115A1 (de) * 1999-07-14 2001-01-25 Robert Bosch Gmbh Brennstoffeinspritzventil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1724464A1 (de) * 2005-05-09 2006-11-22 Siemens Aktiengesellschaft Einspritzventil und Ventilgruppe für das Einspritzventil
EP1734253A1 (de) * 2005-06-17 2006-12-20 Siemens Aktiengesellschaft Einspritzventil mit einem Gehäuse und Verfahren zur Herstellung eines Gehäuses
WO2012048999A3 (de) * 2010-10-14 2012-08-16 Robert Bosch Gmbh Vorrichtung zum einspritzen von kraftstoff
JP2013539838A (ja) * 2010-10-14 2013-10-28 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 燃料噴射装置

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