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EP2363592A1 - Einspritzventil - Google Patents

Einspritzventil Download PDF

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Publication number
EP2363592A1
EP2363592A1 EP10001953A EP10001953A EP2363592A1 EP 2363592 A1 EP2363592 A1 EP 2363592A1 EP 10001953 A EP10001953 A EP 10001953A EP 10001953 A EP10001953 A EP 10001953A EP 2363592 A1 EP2363592 A1 EP 2363592A1
Authority
EP
European Patent Office
Prior art keywords
armature
cavity
injection valve
valve
powder
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Withdrawn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
EP10001953A
Other languages
English (en)
French (fr)
Inventor
Ileana Romeo
Matteo Soriani
Francesco Lenzi
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 GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP10001953A priority Critical patent/EP2363592A1/de
Publication of EP2363592A1 publication Critical patent/EP2363592A1/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Withdrawn legal-status Critical Current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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • 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
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means

Definitions

  • the invention relates to an injection valve.
  • Injection valves are in widespread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • injection valves are manufactured in various forms in order to satisfy the various needs for the various combustion engines. Therefore, for example, their length, their diameter and also various elements of the injection valve being responsible for the way the fluid is dosed may vary in a wide range.
  • injection valves may accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator.
  • the respective injection valve may be suited to dose fluids under very high pressures.
  • the pressures may be in case of a gasoline engine, for example, in the range of up to 200 bar and in the case of diesel engines in the range of up to 2000 bar.
  • the object of the invention is to create an injection valve which facilitates a reliable and precise function.
  • the invention is distinguished by an injection valve, comprising a valve body with a central longitudinal axis and a first cavity and a second cavity.
  • the injection valve further comprises a valve needle which is axially moveable at least in the second cavity and which prevents a fluid injection in a closing position and permits the fluid injection in further positions.
  • the injection valve comprises an armature which is axially moveable at least partially within the first cavity and which is fixedly coupled to the valve needle.
  • the armature comprises at least one armature cavity which is at least partially filled with a powder which features magnetic characteristics.
  • the injection valve also comprises an actuator unit which is operable to magnetically actuate the armature to move axially.
  • the advantage is that a bouncing of the valve needle can be significantly reduced so that the injection valve facilitates a reliable and precise function.
  • the armature basically behaves like an armature being solidly made of steel if the armature is actuated by the actuator unit.
  • the powder preferably dissipates a resulting impact energy by an internal friction among the powder particles. This contributes to reducing, in particular preventing, a bouncing of the valve needle after impacting the valve needle seat.
  • the powder has preferably ferromagnetic characteristics.
  • the at least one armature cavity is preferably completely filled with the powder.
  • the at least one armature cavity is loosely filled with the powder. That means, the powder is not actively compressed while filling it into the at least one armature cavity. If the at least one armature cavity is partially filled with powder, the valve needle is preferably guided in the second cavity of the valve body in such a way that an accumulation of the powder, resulting in an unbalanced weight distribution of the armature, results in no tilting and canting of the armature within the first cavity.
  • the powder comprises metallic chippings. In a further advantageous embodiment of the invention, the powder comprises ferric chippings. This contributes to reliably actuating the armature by the actuator unit.
  • the at least one armature cavity is encapsulated in such a way that the powder stays in the at least one armature cavity while the armature moves axially. This contributes to reliably actuating the armature by the actuator unit.
  • the at least one armature cavity is shaped and/or positioned within the armature in such a way that a resulting centroid of the armature is in an area of a radial centre point of the armature. This contributes to reliably actuating the armature by the actuator unit.
  • the centroid in the area of the radial centre point of the armature represents a balanced weight distribution of the armature.
  • the powder is allocated in the at least one armature cavity in such a way that the resulting centroid of the armature is in the area of the radial centre point of the armature. This contributes to reliably actuating the armature by the actuator unit.
  • FIG. 2 A section of an injection valve 2, that is in particular suitable for dosing fuel to an internal combustion engine, is shown in Fig. 2 in a longitudinal section view.
  • the injection valve 2 comprises an injector body 8 with an injection valve cavity 6.
  • the injection valve 2 also comprises a valve body 4 which is at least partially arranged within the injection valve cavity 6.
  • the valve body 4 comprises a central longitudinal axis L and a first cavity 16 and a second cavity 18.
  • the valve body 4 takes in a valve needle 10 in its first and second cavity 16, 18.
  • an armature 12 is arranged in the first cavity 16.
  • the armature 12 is fixedly coupled to the valve needle 10, for example by welding.
  • the armature 12 comprises an armature cavity 14 which is typically filled with powder.
  • the armature 12 may also comprise multiple armature cavities 14, each being filled with the powder.
  • the powder features ferromagnetic characteristics and comprises by way of example ferric chippings.
  • the armature cavity 14 is preferably encapsulated in such a way that the powder stays in the armature cavity 14 while the armature moves axially.
  • the injection valve 2 is provided with an actuator unit 20 being by way of example a coil assembly that comprises an electromagnetic actuator.
  • the actuator unit 20 comprises preferably a bobbin that retains a coil which is preferably overmolded.
  • the injector body 8 and the armature 12 filled with powder are forming a magnetic circuit if the actuator unit 20 is actuated accordingly.
  • the armature 12 is supplied with a magnetic force if the actuator unit 20 is actuated, thus resulting in an axial movement of the armature 12 and the valve needle 10 acting against a spring load of a bias spring 22 to open the injection valve 2 for injecting fluid through at least one injection nozzle.
  • the injection nozzle may by way of example be an injection hole. However, it may also be of some other type suitable for dosing fluid.
  • valve needle 10 In a closing position of the valve needle 10 it sealingly rests on a valve needle seat by this preventing a fluid flow.
  • the armature 12 and the valve needle 10 are typically moving axially towards the valve needle seat driven by the spring load of the bias spring 22.
  • the powder within the armature cavity 14 typically dissipates an impact energy resulting from the impact event by an internal friction among the powder particles. This contributes to reducing, in particular preventing, a bouncing of the valve needle after impacting the valve needle seat.
  • the impact event may also result if the armature 12 and/or valve needle 10 impact an inlet tube impact face which restricts an axial movement in an opening phase of the injection valve 2.
  • the powder contributes to dissipating the impact energy by internal friction also during the opening phase of the injection valve 2 to at least reduce the bouncing of the valve needle 10 after the opening impact event.

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)
EP10001953A 2010-02-25 2010-02-25 Einspritzventil Withdrawn EP2363592A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10001953A EP2363592A1 (de) 2010-02-25 2010-02-25 Einspritzventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10001953A EP2363592A1 (de) 2010-02-25 2010-02-25 Einspritzventil

Publications (1)

Publication Number Publication Date
EP2363592A1 true EP2363592A1 (de) 2011-09-07

Family

ID=42341452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10001953A Withdrawn EP2363592A1 (de) 2010-02-25 2010-02-25 Einspritzventil

Country Status (1)

Country Link
EP (1) EP2363592A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5284302A (en) * 1992-02-12 1994-02-08 Nippondenso Co., Ltd. Fuel injection valve
US5392811A (en) * 1993-11-02 1995-02-28 Caterpillar Inc. High pressure fuel system valve
DE4332117A1 (de) * 1993-09-22 1995-03-23 Bosch Gmbh Robert Elektromagnetventil
EP1371842A1 (de) * 2002-06-11 2003-12-17 General Motors Corporation Nicht aufprellendes Nadelventil für einen Kraftstoffeinspritzinjektor
EP1703120A1 (de) * 2005-02-24 2006-09-20 Mitsubishi Heavy Industries, Ltd. Elektromagnetisch gesteuerte Kraftstoffeinspritzanordnung mit Ventil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5284302A (en) * 1992-02-12 1994-02-08 Nippondenso Co., Ltd. Fuel injection valve
DE4332117A1 (de) * 1993-09-22 1995-03-23 Bosch Gmbh Robert Elektromagnetventil
US5392811A (en) * 1993-11-02 1995-02-28 Caterpillar Inc. High pressure fuel system valve
EP1371842A1 (de) * 2002-06-11 2003-12-17 General Motors Corporation Nicht aufprellendes Nadelventil für einen Kraftstoffeinspritzinjektor
EP1703120A1 (de) * 2005-02-24 2006-09-20 Mitsubishi Heavy Industries, Ltd. Elektromagnetisch gesteuerte Kraftstoffeinspritzanordnung mit Ventil

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