EP1793120A1 - Soupape d'un injecteur - Google Patents

Soupape d'un injecteur Download PDF

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Publication number
EP1793120A1
EP1793120A1 EP05026380A EP05026380A EP1793120A1 EP 1793120 A1 EP1793120 A1 EP 1793120A1 EP 05026380 A EP05026380 A EP 05026380A EP 05026380 A EP05026380 A EP 05026380A EP 1793120 A1 EP1793120 A1 EP 1793120A1
Authority
EP
European Patent Office
Prior art keywords
valve
chamber
valve needle
fluid
outlet portion
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Withdrawn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
EP05026380A
Other languages
German (de)
English (en)
Inventor
Giovanni Corbinelli
Gianbattista Fischetti
Simone Morfini
Marco Salvini
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
Siemens AG
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 AG filed Critical Siemens AG
Priority to EP05026380A priority Critical patent/EP1793120A1/fr
Publication of EP1793120A1 publication Critical patent/EP1793120A1/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Withdrawn legal-status Critical Current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
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means

Definitions

  • the invention relates to a valve assembly for an injection valve and an injection valve for a combustion chamber of a combustion engine.
  • Injection valves are in widespread use, in particular for internal combustion engines where they may be arranged in order to dose 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 or a piezoelectric actuator.
  • the respective injection valve may be suited to dose fluids under very high pressures.
  • the pressures may be in the case of a gasoline engine in the range of up to 200 bar and in the case of a diesel engine in the range of up to 2 000 bar, for example.
  • the object of the invention is to create a valve assembly which may be manufactured in a simple way and which facilitates a reliable and precise function.
  • valve assembly for an injection valve, comprising a valve body including a central longitudinal axis, the valve body comprising a cavity with a fluid outlet portion, a valve needle axially movable in the cavity, the valve needle having a front surface turned away from the fluid outlet portion and a recess which is arranged in direction of the central longitudinal axis from the front surface over a portion of the axial length of the valve needle, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in further positions, and the valve needle having a surface facing the fluid outlet portion, one component of the normal of the surface extending in parallel to the central longitudinal axis.
  • the valve assembly comprises a main fluid line enabling the fluid flow through the fluid outlet portion comprising the recess of the valve needle and the cavity of the valve body, a chamber arranged between the surface of the valve needle and the valve body in direction of the central longitudinal axis, and a channel forming a single hydraulic coupling of the chamber with the main fluid line and forming a throttle element for the fluid flow between the chamber and the main fluid line.
  • the chamber is coupled with the main fluid line via the channel which is the only hydraulic connection path between the chamber and the main fluid line. Therefore a fluid flow between the chamber and the main fluid line can only occur via the channel.
  • valve assembly the chamber with the fluid in combination with the channel is acting as a dampening element during the movement of the valve needle.
  • the volume of the chamber is increasing and fluid has to flow from the main fluid line to the chamber through the channel.
  • the volume of the chamber is decreasing and the fluid has to flow from the chamber to the main fluid line through the channel.
  • the channel is formed as a throttle element the fluid flow between the chamber and the main fluid line can be retarded and consequently the velocity of the movement of the valve needle can be reduced. Due to that the movement of the valve needle can be dampened because it is coupled with a time consuming fluid flow through the channel from the chamber to the main fluid line or reverse. Consequently, the chamber with the fluid contained in the chamber in combination with the channel acts as a hydraulic dampening element.
  • a further advantage of the valve assembly is that during the movement of the valve needle into the closing position an anti-bounce effect occurs. This is due to the fact that the movement of the valve needle can be dampened and therefore an optimal closing velocity of the valve needle can be obtained by dimensioning the cross section area of the channel and the volume of the chamber appropriately.
  • the chamber is arranged axially symmetric relative to the central longitudinal axis.
  • valve assembly comprises a return fluid line communicating with the chamber and a sealing element is arranged between the chamber and the return fluid line.
  • an end section of the channel orientated away from the chamber comprises a chamfer.
  • An injection valve 10 may be used as a fuel injection valve for a combustion chamber of an internal combustion engine and comprises a valve assembly 14, an actuator unit 16 and a fuel connector 18.
  • the fuel connector 18 is designed to be connected to a high-pressure fuel chamber of the internal combustion engine, the fuel is stored under high pressure, for example, under the pressure of about 200 bar in the case of a gasoline engine or of about 2000 bar in the case of a diesel engine.
  • the fuel connector 18 has an inlet tube 19 and is fixed to a housing 12 of the actuator unit 16 on one of its free ends.
  • the fuel connector 18 On its upper end the fuel connector 18 comprises a fluid inlet portion 26.
  • the valve assembly 14 comprises a valve body 20 with a central longitudinal axis L and a cavity 24 which is axially led through the valve body 20.
  • the valve assembly 14 further comprises a valve needle 22 taken in the cavity 24 of the valve body 20.
  • the valve needle 22 comprises an end section 22a and an armature 22b. Alternatively the valve needle 22 may be made in one piece or the valve needle 22 may comprise further parts.
  • the armature 22b is fixed to the end section 22a of the valve needle 22.
  • the valve needle 22 has a front surface 37 turned away from a fluid outlet portion 28 of the cavity 24 and a recess 38 which is arranged in direction of the central longitudinal axis L from the front surface 37 over a portion of the axial length of the valve needle 22.
  • the armature 22b has openings 25 which couple the recess 38 of the valve needle 22 and the cavity 24 of the valve body 20 hydraulically.
  • the recess 38 of the valve needle 22, the openings 25 and the cavity 24 of the valve body 20 are parts of a main fluid line which allows a fluid flow from the fluid inlet portion 26 to the fluid outlet portion 28.
  • the valve needle 22 comprises a surface 23 facing the fluid outlet portion 28.
  • One component of the normal of the surface 23 is extending in parallel to the central longitudinal axis L.
  • the surface 23 is preferably located on the armature 22b and borders a chamber 40 together with the valve body 20.
  • the fluid outlet portion 28 is formed which is closed or opened depending on the axial position of the valve needle 22.
  • a closing position of the valve needle 22 it rests sealingly on a seat 29 thereby preventing a fluid flow through at least one injection nozzle 30 in the valve body 20.
  • the injection nozzle 30 may be for example an injection hole, but it may also be of some other type suitable for dosing fluid.
  • the seat 29 may be made in one part with the valve body 20 or may also be a separate part from the valve body 20.
  • a spring 31 is arranged in the recess 38 of the valve needle 22 preferably to rest on a first spring rest 32 and a second spring rest 34 of the valve needle 22. By this the spring 31 is mechanically coupled to the valve needle 22.
  • An adjusting tube 35 is provided in the recess 38 of the valve needle 22. The adjusting tube 35 comprises the first spring rest 32 for the spring 31 and may be moved axially during the manufacturing process of the injector in order to preload the spring 31 in a desired way.
  • the injector is provided with a drive, that is preferably an electromagnetic drive, comprising a coil 36, which is preferably extrusion-coated, the valve body 20, the armature 22b and the inlet tube 19 all forming an electromagnetic circuit.
  • the armature 22b preferably has a large diameter compared to the diameter of the end section 22a of the valve needle 22. The large diameter enables a proper electromagnetic flow through the armature 22b which contributes to a proper controllability of the end section 22a of the valve needle 22.
  • the coil 36 If the coil 36 is energized this results in an electromagnetic force acting on the valve needle 22.
  • the electromagnetic force acts against the mechanical force obtained from the spring 31.
  • the valve needle 22, in particular the end section 22a of the valve needle 22 may in that way be moved away from its closing position which results in a fluid flow through the injection nozzle 30. After a predetermined time the coil 36 may be de-energized again.
  • Figures 2 and 3 show a section of the valve assembly 14 in an enlarged detailed view.
  • the chamber 40 is arranged which is coupled hydraulically with the recess 38 of the valve needle 22 by a channel 42.
  • the chamber 40 is arranged axially symmetric relative to the central longitudinal axis L.
  • the channel 42 has preferably a circular cross section shape with a diameter D.
  • the valve needle 22 comprises preferably a sealing element 44, which is preferably made of plastics, in particular made of rubber, and can reduce the fluid flow from the chamber 40 to an return fluid line 46 between the valve body 20 and the valve needle 22.
  • the sealing element 44 can be avoided if the valve body 20 and the valve needle 22 are dimensioned in an appropriate manner to reduce the fluid flow from the chamber 40 to the return fluid line 46.
  • the sealing element 44 has preferably to be dimensioned in a way that the fluid flow from the chamber 40 to the return fluid line 46 is much smaller than the fluid flow from the chamber 40 to the recess 38 via the channel 42.
  • the valve body 20 comprises a protrusion 47 which limits the chamber 40 at its lower end.
  • the protrusion 47 of the valve body 20 has a sealing layer 48 which provides a sealing between the valve body 20 and the valve needle 22 which can avoid a leak fluid flow from the chamber 40 to the fluid outlet portion 28.
  • FIGS 2 and 3 show the valve needle 22 in a position when it is moved away from its closing position in maximum. This can result in a fluid flow through the injection nozzle 30. Furthermore, a lowest level 50 of the armature 22b is shown if the valve needle 22 is in its closing position. This results in a working lift W which represents the vertical difference between the maximum opening position and the closing position of the valve needle 22 defined by the lowest level 50 of the armature 22b. Consequently, the chamber 40 has a volume difference 54 between the maximum position and the minimum position of the valve needle 22.
  • an end section 58 of the channel 42 orientated away from the chamber 40 comprises a chamfer 56 which facilitates the fluid flow between the recess 38 of the valve needle 22 and the chamber 40.
  • valve needle 22 If the valve needle 22 is moving upward from its closing to an opening position fluid may flow from the recess 38 of the valve needle 22 through the channel 42 to the chamber 40.
  • the fluid flow through the channel 42 depends on the diameter D of the channel 42 and the volume of the chamber 40.
  • the chamber 40 in combination with the channel 42 may reduce the velocity of the valve needle 22. This affects the movement of the whole valve needle 22. Therefore it is possible to adjust the movement of the valve needle 22 by adjusting the diameter D of the channel 42 and the volume of the chamber 40. By this a damping effect can be achieved which affects the movement of the valve needle 22. This contributes to a precise dosing of the fluid.
  • valve needle 22 If the valve needle 22 is moving downward from an opening position to the closing position the volume of the chamber 40 has to be reduced and fluid can flow from the chamber 40 through the channel 42 to the recess 38 of the valve needle 22.
  • the closing movement of the valve needle 22 is influenced dependent on the quantity of the fluid flow from the chamber 40 to the recess 38 through the channel 42. Therefore, the movement of the valve needle 22 may be adjusted by adjusting the diameter D of the channel 42 and the volume of the chamber 40. This may create a damping effect which influences the movement of the valve needle 22 and therefore contributes to a precise dosing of the fluid.
  • valve needle 22 As the opening and closing movement of the valve needle 22 is affected by the chamber 40 and the channel 42 according to their geometry, oscillations of the valve needle 22 may be reduced and therefore a anti-bouncing effect and a more precise dosing of the fluid is achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP05026380A 2005-12-02 2005-12-02 Soupape d'un injecteur Withdrawn EP1793120A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05026380A EP1793120A1 (fr) 2005-12-02 2005-12-02 Soupape d'un injecteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05026380A EP1793120A1 (fr) 2005-12-02 2005-12-02 Soupape d'un injecteur

Publications (1)

Publication Number Publication Date
EP1793120A1 true EP1793120A1 (fr) 2007-06-06

Family

ID=36097242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05026380A Withdrawn EP1793120A1 (fr) 2005-12-02 2005-12-02 Soupape d'un injecteur

Country Status (1)

Country Link
EP (1) EP1793120A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2067983A1 (fr) 2007-12-04 2009-06-10 Continental Automotive GmbH Ensemble de vanne pour soupape d'injection, et soupape d'injection
CN105849403A (zh) * 2013-10-14 2016-08-10 大陆汽车有限公司 喷射阀

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1285153A (en) * 1971-02-01 1972-08-09 Barkas Werke Ifa Kom Fuer Kraf Improvements in and relating to injection valves for internal combustion engines
DE3841322A1 (de) * 1988-12-08 1990-06-13 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE10062960A1 (de) * 2000-12-16 2002-06-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP1416152A1 (fr) * 2002-10-31 2004-05-06 Robert Bosch Gmbh Soupape pour le contrôle des fluides avec alimentation d'un fluide sous pression
US20050072865A1 (en) * 2003-10-01 2005-04-07 Nippon Soken, Inc. Fuel injection valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1285153A (en) * 1971-02-01 1972-08-09 Barkas Werke Ifa Kom Fuer Kraf Improvements in and relating to injection valves for internal combustion engines
DE3841322A1 (de) * 1988-12-08 1990-06-13 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE10062960A1 (de) * 2000-12-16 2002-06-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP1416152A1 (fr) * 2002-10-31 2004-05-06 Robert Bosch Gmbh Soupape pour le contrôle des fluides avec alimentation d'un fluide sous pression
US20050072865A1 (en) * 2003-10-01 2005-04-07 Nippon Soken, Inc. Fuel injection valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2067983A1 (fr) 2007-12-04 2009-06-10 Continental Automotive GmbH Ensemble de vanne pour soupape d'injection, et soupape d'injection
EP2067983B1 (fr) * 2007-12-04 2014-07-16 Continental Automotive GmbH Ensemble de vanne pour soupape d'injection, et soupape d'injection
CN105849403A (zh) * 2013-10-14 2016-08-10 大陆汽车有限公司 喷射阀

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