EP2226492A1 - Einspritzventil mit einer Bewegungsenergie absorbierenden Ventilnadel - Google Patents

Einspritzventil mit einer Bewegungsenergie absorbierenden Ventilnadel Download PDF

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Publication number
EP2226492A1
EP2226492A1 EP09003116A EP09003116A EP2226492A1 EP 2226492 A1 EP2226492 A1 EP 2226492A1 EP 09003116 A EP09003116 A EP 09003116A EP 09003116 A EP09003116 A EP 09003116A EP 2226492 A1 EP2226492 A1 EP 2226492A1
Authority
EP
European Patent Office
Prior art keywords
valve needle
sealing element
valve
needle body
injection
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Withdrawn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
EP09003116A
Other languages
English (en)
French (fr)
Inventor
Giovanni Guarneri
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 EP09003116A priority Critical patent/EP2226492A1/de
Publication of EP2226492A1 publication Critical patent/EP2226492A1/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Withdrawn legal-status Critical Current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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
    • 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
    • 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
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • 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 comprising a valve needle.
  • 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 valve 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.
  • US 6,523,759 B1 discloses that during operation of the injection valve, a close action of the valve needle to prevent dosing of fluid into the intake manifold or into the combustion chamber is followed by an unwanted reopen and close phase of the valve needle, called needle bounce.
  • a flow restrictor is disposed in an armature of the valve needle to restrict fluid flow towards an upstream end of the armature, resulting in a reduced bouncing of the valve needle.
  • 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 central longitudinal axis and a valve needle.
  • the valve needle comprises a valve needle body being actuated to move axially.
  • the valve needle further comprises a sealing element preventing a fluid injection in a closing position and permitting the fluid injection in further positions.
  • the valve needle comprises a guiding element being axially moveable and being fixedly coupled to the sealing element and being operable to couple the sealing element to the valve needle body.
  • the valve needle also comprises at least one spring element being preloaded and being adopted to supply the sealing element and/or the guiding element with a spring load to absorb at least partially a kinetic energy of the valve needle body, if the sealing element reaches its closing position.
  • valve needle body is coupled to an armature which is actuated by a solenoid in case of an electromagnetic actuated injection valve.
  • valve needle body is preferably coupled to a piezoelectric actuator.
  • the valve needle body and the sealing element are axially moveable relative to each other and are axially spaced to each other via the at least one spring element. In non-closing positions of the valve needle, the space between the sealing element and the valve needle body is maximal by way of the spring effect of the preloaded spring element.
  • the sealing element In the moment of reaching the closing position, the sealing element is basically decoupled from the movement of the valve needle body via the spring element and the guiding element.
  • the spring element at least partially absorbs the kinetic energy of the movement of the valve needle body.
  • the sealing element is basically not affected by the movement of the valve needle body, thus reducing the bouncing of the sealing element and an uncontrolled fuel injection.
  • the valve needle body comprises a cavity.
  • the guiding element is disposed at least partially within the cavity and is axially moveable within the cavity.
  • the guiding element is operable to arrange the sealing element coaxial to the valve needle body. This contributes to keep the sealing element coaxial to the valve needle body and by this facilitates a reliable and precise fuel injection.
  • the guiding element is axially guided by the inner wall of the cavity to keep the sealing element coaxial to the valve needle body.
  • the sealing element has a spherical or conical shape. This contributes to ensuring a reliable and precise function of the injection valve.
  • a first seat of the at least one spring element is formed by the valve needle body. This facilitates a simple manufacturing of the valve needle.
  • a second seat of the at least one spring element is formed by the sealing element. This facilitates a simple manufacturing of the valve needle.
  • the valve needle body comprises at least one projection which forms the first seat of the at least one spring element and/or where the guiding element rests on, if the sealing element is in further positions.
  • the further positions of the valve needle represent a non-closing position of the valve needle. In this position the guiding element rests on the projection of the valve needle body and by this pretends the maximal space between the sealing element and the valve needle body.
  • the maximal space between the sealing element and the valve needle body is predetermined in such a way, that the spring element is still preloaded.
  • FIG. 1 An exemplary embodiment of the invention is explained in the following with the aid of a schematic drawing.
  • the figure depicts an injection valve with a valve needle.
  • An injection valve 100 (figure), that is in particular suitable for dosing fuel into an internal combustion engine, comprises an injection valve housing 40 with a central longitudinal axis L, a valve needle 10 and a valve needle seat 70.
  • the valve needle 10 comprises a valve needle body 20, a sealing element 50, a guiding element 90 and a spring element 60.
  • the valve needle body 20 preferably has a cylindrical shape and is actuated by an actuator of the injection valve 100, e.g. an electromagnetic actuator or a piezoelectric actuator. While being actuated, the valve needle body 20 moves axially within the injection valve housing 40.
  • the valve needle body 20 comprises a cavity 30 wherein the guiding element 90 is partially disposed.
  • the guiding element 90 comprises a first and a second portion 110, 120 and is at least partially made of stainless steel.
  • the first portion 110 is disposed within the cavity 30 of the valve needle body 20 and has preferably a cylindrical shape with a diameter basically identical to an inner diameter of the cavity of the valve needle body 20.
  • the guiding element 90 is mainly guided in axial direction by its first portion 110, whereas the guiding element 90 is guided through the inner wall of the cavity 30.
  • the diameter of the second portion 120 is less than the diameter of the first portion 110.
  • the second portion 120 of the guiding element 90 preferably has a cylindrical shape and is fixedly coupled to the sealing element 50, e.g. welded.
  • the guiding element 90 is operable to keep the sealing element 50 basically coaxial to the valve needle body 20 and the guiding element 90 and the sealing element 50 are both axially moveable within the injection valve housing 40. This facilitates a precise and reliable fuel injection.
  • the valve needle body 20 comprises a projection 80, which forms a seat where the first portion of the guiding element 90 rests on, if the sealing element 50 is in a non-closing position.
  • the projection 80 may be formed by means of plastical deformation. The axial expansion of the second portion predetermines the maximal space between the sealing element 50 and the valve needle body 20.
  • the sealing element 50 has a spherical shape. Alternatively, the sealing element 50 can have a conical shape. In a closing position of the valve needle 10, the sealing element 50 sealingly rests on the valve needle seat 70, by this preventing a fluid flow through at least one injection nozzle of the injection valve 100.
  • the injection nozzle may be, for example, an injection hole. However, it may also be of some other type suitable for dosing fluid.
  • the sealing element 50 permits the fluid injection into the combustion chamber in further positions, i.e. when it does not rest on the valve needle seat 70. The further positions represent non-closing positions.
  • the sealing element 50 is mechanically coupled to the valve needle body 20.
  • the spring element 60 is a helical spring and preferably made of stainless steel.
  • the spring element 60 is arranged around the second portion 120 of the guiding element 90.
  • the projection 80 of the valve needle body 20 forms a first seat of the spring element 60 and the sealing element 50 itself forms a second seat of the spring element 60.
  • the spring element 60 is preloaded and keeps the guiding element 90 to rest on the projection 80, if the valve needle 10 is in a non-closing position.
  • the sealing element 50 is in the closing position, the axial space between the sealing element 50 and the projection 80 of the valve needle body 20 facilitates an axial movement, i.e. up and down movement, of the valve needle body 20 within a predetermined axial area.
  • the spring element 60 and the guiding element 90 basically decouple the sealing element 50 from the movements of the valve needle body 20.
  • the movements of the valve needle body 20 do not affect the position of the sealing element 50 which still rests on the valve needle seat 70, while the kinetic energy of the valve needle body 20 is at least partially absorbed by the spring element 60.
  • the valve needle body 20 typically oscillates in axial direction with decreasing oscillation amplitude.
  • a damping constant of the decreasing oscillation of the valve needle body 20 is, among other effects, dependent on the spring rate of the spring element 60.
  • the sealing element 50 Due to the decoupling of the axial oscillation of the valve needle body 20 and the sealing element 50, the sealing element 50 still rests on the valve needle seat 70 and by this contributes to eliminating a bouncing of the sealing element 50 after impacting the valve needle seat 70. This contributes to preventing an uncontrolled fuel injection during the closing phase of the injection valve 100.
  • the spring element 60 is arranged in such a way that it directly affects the guiding element 90, e.g. within the cavity 30 of the valve needle body 20.
  • valve needle 10 comprises more than one spring element.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP09003116A 2009-03-04 2009-03-04 Einspritzventil mit einer Bewegungsenergie absorbierenden Ventilnadel Withdrawn EP2226492A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09003116A EP2226492A1 (de) 2009-03-04 2009-03-04 Einspritzventil mit einer Bewegungsenergie absorbierenden Ventilnadel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09003116A EP2226492A1 (de) 2009-03-04 2009-03-04 Einspritzventil mit einer Bewegungsenergie absorbierenden Ventilnadel

Publications (1)

Publication Number Publication Date
EP2226492A1 true EP2226492A1 (de) 2010-09-08

Family

ID=41037684

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09003116A Withdrawn EP2226492A1 (de) 2009-03-04 2009-03-04 Einspritzventil mit einer Bewegungsenergie absorbierenden Ventilnadel

Country Status (1)

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EP (1) EP2226492A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017133892A1 (en) * 2016-02-01 2017-08-10 Delphi International Operations Luxembourg S.À R.L. Fuel injector nozzle and needle arrangement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002006664A1 (de) * 2000-07-15 2002-01-24 Robert Bosch Gmbh Brennstoffeinspritzventil
WO2002046604A2 (de) * 2000-12-05 2002-06-13 Robert Bosch Gmbh Brennstoffeinspritzventil
US6523759B1 (en) 2000-06-27 2003-02-25 Siemens Automotive Corporation Adjustable anti-bounce armature disk
DE10325734A1 (de) * 2003-06-06 2004-12-23 Robert Bosch Gmbh Ventil zum Steuern eines Fluids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6523759B1 (en) 2000-06-27 2003-02-25 Siemens Automotive Corporation Adjustable anti-bounce armature disk
WO2002006664A1 (de) * 2000-07-15 2002-01-24 Robert Bosch Gmbh Brennstoffeinspritzventil
WO2002046604A2 (de) * 2000-12-05 2002-06-13 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10325734A1 (de) * 2003-06-06 2004-12-23 Robert Bosch Gmbh Ventil zum Steuern eines Fluids

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017133892A1 (en) * 2016-02-01 2017-08-10 Delphi International Operations Luxembourg S.À R.L. Fuel injector nozzle and needle arrangement

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