EP2871353B1 - Vanne pour le dosage de fluide - Google Patents

Vanne pour le dosage de fluide Download PDF

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Publication number
EP2871353B1
EP2871353B1 EP14183696.5A EP14183696A EP2871353B1 EP 2871353 B1 EP2871353 B1 EP 2871353B1 EP 14183696 A EP14183696 A EP 14183696A EP 2871353 B1 EP2871353 B1 EP 2871353B1
Authority
EP
European Patent Office
Prior art keywords
armature
valve
valve needle
stop
sleeve
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.)
Not-in-force
Application number
EP14183696.5A
Other languages
German (de)
English (en)
Other versions
EP2871353A1 (fr
Inventor
Ralf Kromer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2871353A1 publication Critical patent/EP2871353A1/fr
Application granted granted Critical
Publication of EP2871353B1 publication Critical patent/EP2871353B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/061—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
    • 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
    • F02M51/0685—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 and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals
    • F02M2200/9069—Non-magnetic metals

Definitions

  • the invention is based on a valve for metering fluid according to the preamble of claim 1, wherein the standing for a flowing or flowing medium, superordinate term fluid is used in accordance with the fluid flow theory for gases and liquids.
  • a known fuel injection valve ( DE 101 08 945 A1 ) has a sleeve-shaped nozzle body which is closed by a valve seat body with an injection opening enclosed by a valve seat.
  • a valve chamber which is in communication with a fuel inlet.
  • the injection opening controlling valve needle which carries a forming a sealing seat with the valve seat closing head.
  • the valve needle is acted upon at the end remote from the closing head needle end of a valve closing spring, which presses the closing head on the valve seat, so that the injection opening is closed.
  • the release of the ejection opening is effected by an electromagnet, which drives the valve needle against the force of the valve closing spring to a lifting head from the valve seat lifting hub.
  • an electromagnet which drives the valve needle against the force of the valve closing spring to a lifting head from the valve seat lifting hub.
  • a magnetic flux is produced which passes over an outer pole, an inner pole, an armature axially slidably seated on the valve needle and a working air gap enclosed between the armature and inner pole and generates a magnetic force in the working air gap which drives the armature for lifting movement in the direction of the inner pole.
  • a driver is fixed, which is guided axially displaceably in the interior of the hollow cylindrical inner pole and has a first anchor stop for the armature.
  • a second anchor stop is set on the valve needle, to which the armature is pressed by a between anchor and driver supporting Vorhubfeder.
  • the electromagnet When the electromagnet is energized, the armature initially executes a free travel or forward stroke relative to the valve needle until it abuts the driver on the first armature stop, gives the valve needle a mechanical opening impulse and carries the valve needle over the driver, whereby the closing head begins to lift off the valve seat .
  • the armature abuts against the pole face of the inner pole, and the injection opening is completely released, so that the fuel under pressure in the valve chamber is sprayed off in a metered quantity via the injection opening.
  • the valve closing spring presses the closing head on the valve seat via the valve needle and the Vorhubfeder the anchor against the second anchor stop.
  • valve according to the invention for metering fluid with the features of claim 1 has the advantage that on the one hand for the valve needle inexpensive, ferromagnetic material can be used and on the other hand by the compact, not made of magnetically or poorly conductive material, non-magnetic separation sleeve as solid Part of the armature a magnetic flux through the valve needle to the inner pole prevented and thus a loss of flux between the armature and the inner pole, combined with a lowering of the magnetic force is prevented.
  • the displacement of the stop surface required for anchoring to the valve needle at the end of Ankervorhubs or -freiwegs on the non-magnetic separation sleeve also prevents weakening of the magnetic force in the Ankervorhub subsequent working stroke of the armature to hit the pole face of the inner pole.
  • the separating sleeve is manufactured as a separate component and firmly connected to the anchor, preferably pressed into the anchor or welded to the anchor.
  • the anchor and separator sleeve can be made in one piece in a 2K MIM process.
  • a guide region for the armature axially displaceable relative to the valve needle is present, which advantageously has two axially spaced annular guide surfaces, of which a guide surface on the circumference of a fixedly connected to the valve needle ring is arranged on which the separating sleeve is supported radially, and the other guide surface is formed centrally in a sleeve bottom closing the separating sleeve, which is radially supported on the valve needle.
  • the division of the guide area on two axially spaced guide surfaces allows easy integration of the Vorhubfeder in the separating sleeve, resulting in an axially short valve construction.
  • the two guide surfaces bearing components ring and sleeve bottom are also used for the axial support of the Vorhubfeder.
  • the separating sleeve over the armature stop facing the front end of the armature is further reduced.
  • At least one radial or transverse bore opening in the interior of the separating sleeve is introduced in the projection region of the separating sleeve.
  • Sectionally shown in longitudinal section valve for metering fluid is preferably used as an injection valve for injecting fuel in a fuel injection system of internal combustion engines. However, it can also be used in gas engines or in heating systems for the metered metering of fluid fuel or as a metering valve for injecting a fluid reducing agent into the exhaust gas tract of an internal combustion engine for the purpose of reducing nitrogen oxides.
  • the valve has a metering port 12 communicating with a fluid inlet 11 and a valve needle 13 controlling the metering port 12 by means of a closing head 131 which is acted upon by a valve closing spring 14 to close the metering port 12 and by an electromagnet 15 to release the metering port 12 the closing force of the valve closing spring 14 is actuated.
  • the closing head 131 is guided in a valve seat body 16 which has the metering opening 12 and a valve seat 17 enclosing the metering opening 12 and forming a sealing seat with the closing head 131 of the valve needle 13.
  • valve seat body 16 closes off a kanness workedes end of a valve sleeve 18 from fluid-tight, with its other end to a radial flange 191 having a hollow valve body 19 firmly connected, z. B. welded, is
  • the electromagnet 15 has a magnetic coil 20, which can be supplied with current via a connector, not shown, on the valve.
  • a magnetic flux is formed in the electromagnet 15, which has an outer pole 21, a hollow cylindrical inner pole 22, a on the Valve needle 13 axially displaceable armature 23 and one of armature 23 and inner pole 22 limited working air gap 24 extends.
  • a driver 25 is fixed, for example, welded or integrally formed, which dips into the hollow cylindrical interior of the inner pole 22 and is guided axially displaceable therein.
  • the driver 25 has a radial stop shoulder 251 for the armature 23, which limits a relative to the axial gap width of the working air gap 24 smaller free travel or Vorhubweg 26 of the armature 23 relative to the valve needle 13 ( FIG. 2 ).
  • This Vorhubweg 26 of the armature 23 is fixed by an anchor stop 27, which on the side facing away from the driver 25 side of the armature 23 on the valve needle 13, z. B. welded or integrally formed, and a Freiweg- or Vorhubfeder 28 set, which presses the armature 13 to the anchor stop 27.
  • the free or Vorhubweg 26 of the armature 23 allows for energizing the solenoid 20 of the electromagnet 15 lifting the armature 23 from the armature stop 27 without the valve needle 13 is carried and the closing head 131 of the valve needle 13 lifts from the valve seat 17.
  • the accelerated by the magnetic force in the direction of driver 25 anchor 23 abuts against the stop shoulder 251 of the driver 25 and thereby transmits a mechanical impulse to the valve needle 13, which promotes the lifting of the closing head 131 from the valve seat 17, so that the opening dynamics of the valve is improved ,
  • the inner pole 22 is structurally formed by a hollow cylindrical magnetic core 30 and the outer pole 21 comprises the valve body 19 and a magnetic sleeve 31 seated concentrically to the magnetic coil 20 on the radial flange 191 of the valve body 19.
  • the magnetic sleeve 31 is open welded to the valve body 19 and connected via a magnetic yoke 32 to the magnetic core 30.
  • Magnetic core 30, magnetic sleeve 31, valve body 19 and armature 23 are usually made of a magnetically highly conductive material, eg. B. a ferromagnetic material.
  • Valve body 19 and magnetic core 30 are fixedly connected to each other, which is done to avoid an armature 23 bridging, magnetic short circuit between the inner and outer pole 22, 21 via an amagnetic intermediate part 29 with a high magnetic resistance.
  • the valve needle 13 is preferably integrally formed driver 25, anchor stop 27 and closing head 131 made of a magnetically conductive material, for. As a ferromagnetic material produced.
  • an amagnetic separating sleeve 33 is arranged, which is fixedly connected to the armature 23, z. B. is pressed centrally into the armature 23 and / or welded to the armature 23.
  • armature 23 and separator sleeve 33 are fabricated integrally in a 2K MIM process.
  • Amagnetic is understood to mean a material which is not magnetically or only poorly conductive, that is to say a material having a very high magnetic resistance.
  • a stop face 331 cooperating with the stop shoulder 251 on the driver 25 and a second stop face 332 cooperating with the anchor stop 27 are formed on front ends facing away from one another.
  • a guide portion for the relative to the valve needle 13 axially displaceable armature 23 is provided which is designed so that on the one hand arranged on the valve needle 13 Vorhubfeder 28 can be integrated into the separating sleeve 33 and on the other hand, a tilting of the armature 23rd is largely suppressed on the valve needle 13.
  • the armature guide region has two axially spaced, annular guide surfaces 34 and 35.
  • the one guide surface 34 forms the outer casing of a ring 36 fastened to the valve needle 13, on which the separating sleeve 33 is radially supported, and the other guide surface 35 is formed centrally in a sleeve bottom 333, which closes the separating sleeve 33 at its end facing the anchor stop 27 and is supported on the valve needle 13.
  • the Vorhubfeder 28 sits in a present between the two guide surfaces 34 and 35 so-called.
  • Vorhubfederraum 43 loosely on the valve needle 13 and is supported axially between the ring 36 and the sleeve bottom 333.
  • the first stop surface 331 communicating with the stop shoulder 251 on the driver 25 is at the opening edge of the separating sleeve 33 and the second stop surface 332 communicating with the anchor stop 27 is formed on the sleeve bottom 333.
  • the separating sleeve 33 is above the armature stop 27 facing the front end of the armature 23 via. This supernatant also opens up the possibility of introducing at least one transverse or radial bore 37, which completely penetrates the sleeve wall, into the separating sleeve 33 in order to open the preloading spring space 43 between the annular collar 36 and the sleeve bottom 333.
  • a fluid inlet 11 enclosing connection piece 38 is placed coaxially, and connecting piece 38 and magnetic core 30 are connected via a plastic sheath 39 firmly together.
  • a fluid filter 41 is used, which also serves as adjusting means for the closing force of the hollow magnetic core 30 received valve closing spring 14, which is supported for this purpose on the driver 25 and the fluid filter 41.
  • Fluid inlet 11 and the orifice 12 are connected via the hollow interior of the inner pole 22 representing magnetic core 30 and at least one held in the armature 23 axial channel 42 with each other.
  • at least one axialnectnanschliff 252 is provided in the guided in the inner pole 22 outer surface of the driver 25.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)

Claims (9)

  1. Soupape pour le dosage de fluide, avec une ouverture de dosage (12) reliée à une amenée de fluide (11), avec un pointeau de soupape (13) commandant l'ouverture de dosage (12) alimenté pour fermer l'ouverture de dosage (12) à l'aide d'un ressort de fermeture de soupape (14), avec un électroaimant (15) actionnant le pointeau de soupape (13) contre la force de fermeture du ressort de fermeture de soupape (14) pour libérer l'ouverture de dosage (12), ledit électroaimant comportant un pôle extérieur (21), un pôle intérieur (22) en forme de cylindre creux, une ancre (23) pouvant coulisser sur le pointeau de soupape (13) et une fente d'air de travail (24) délimitée par l'ancre (23) et le pôle intérieur (22), avec un doigt d'entraînement (25) guidé dans le pôle intérieur (22) comportant un épaulement de butée (251) pour l'ancre (23) ainsi qu'une butée d'ancre (27), ces deux éléments étant disposés fixement sur les côtés opposés de l'ancre (23) sur le pointeau de soupape (13) et délimitant une course libre ou d'avance (26) de l'ancre (23) par rapport au pointeau de soupape (13) inférieure à la largeur axiale de fente de la fente d'air de travail (24) et avec un ressort de course d'avance (28) s'appuyant entre le pointeau de soupape (13) et l'ancre (23) et comprimant l'ancre (23) contre la butée d'ancre (27), caractérisée en ce que le pointeau de soupape (13) et le doigt d'entraînement (25) sont fabriqués à partir d'une matière à conduction magnétique et qu'une douille de séparation (33) amagnétique reliée fixement à l'ancre (23) est disposée entre l'ancre (23) et le pointeau de soupape (13), ladite douille comportant une surface de butée (331) interagissant avec l'épaulement de butée (251) au niveau du doigt d'entraînement (25).
  2. Soupape selon la revendication 1, caractérisée en ce qu'une zone de guidage est réalisée entre la douille de séparation (33) et le pointeau de soupape (13) pour permettre le coulissement axial de l'ancre (23) sur le pointeau de soupape (13).
  3. Soupape selon la revendication 2, caractérisée en ce que la zone de guidage comporte une première et une deuxième surface de guidage (34, 35) de forme respectivement annulaire placée à une certaine distance dans le plan axial de la première surface, que la première surface de guidage (34) s'appuie sur la périphérie extérieure d'une bague (36) reliée fixement au pointeau de soupape (13) et sur laquelle la douille de séparation (33) s'appuie et que la deuxième surface de guidage (35) est réalisée de façon centrale dans un fond de douille (333) finissant la douille de séparation (33) et s'appuyant sur le pointeau de soupape (13) et que le ressort de course d'avance (28) repose dans la douille de séparation (33) et s'appuie dans le plan axial entre la bague (36) et le fond de douille (333).
  4. Soupape selon la revendication 3, caractérisée en ce que la surface de butée (331) interagissant avec l'épaulement de butée (251) est réalisée au niveau du doigt d'entraînement (25) au niveau du bord d'ouverture de la douille de séparation (33) et qu'une surface de butée (332) supplémentaire interagissant avec la butée d'ancre (27) est réalisée sur le fond de douille (333).
  5. Soupape selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la douille de séparation (33) ressort au-delà de l'extrémité frontale, orientée vers la butée d'ancre (27), de l'ancre (23).
  6. Soupape selon la revendication 5, caractérisée en ce qu'au moins un alésage radial (37) débouchant dans l'intérieur de la douille est amené dans la douille de séparation (33), dans la zone de saillie de la douille de séparation (33).
  7. Soupape selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la douille de séparation (33) est comprimée et/ou soudée dans l'ancre (23).
  8. Soupape selon l'une quelconque des revendications 1 à 6, caractérisée en ce que l'ancre (23) et la douille de séparation (33) sont fabriquées d'un seul tenant selon un procédé 2K-MIM.
  9. Soupape selon l'une quelconque des revendications 1 à 8, caractérisée en ce que la liaison entre l'amenée de fluide (11) et l'ouverture de dosage (12) est fabriquée via l'intérieur creux du pôle intérieur (22) et au moins un canal axial (42) prévu dans l'ancre (23) et qu'au moins une surface affûtée (252) est prévue pour le passage de fluide dans la surface extérieure, guidée dans le pôle intérieur, du doigt d'entraînement (25).
EP14183696.5A 2013-11-07 2014-09-05 Vanne pour le dosage de fluide Not-in-force EP2871353B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201310222596 DE102013222596A1 (de) 2013-11-07 2013-11-07 Ventil zum Zumessen von Fluid

Publications (2)

Publication Number Publication Date
EP2871353A1 EP2871353A1 (fr) 2015-05-13
EP2871353B1 true EP2871353B1 (fr) 2016-08-24

Family

ID=51492195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14183696.5A Not-in-force EP2871353B1 (fr) 2013-11-07 2014-09-05 Vanne pour le dosage de fluide

Country Status (2)

Country Link
EP (1) EP2871353B1 (fr)
DE (1) DE102013222596A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3156638B1 (fr) * 2015-10-14 2020-03-18 Vitesco Technologies GmbH Injecteur de carburant

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10108945A1 (de) 2001-02-24 2002-09-05 Bosch Gmbh Robert Brennstoffeinspritzventil
JP5218487B2 (ja) * 2009-12-04 2013-06-26 株式会社デンソー 燃料噴射弁
JP5822269B2 (ja) * 2011-11-11 2015-11-24 株式会社ケーヒン 電磁式燃料噴射弁

Also Published As

Publication number Publication date
EP2871353A1 (fr) 2015-05-13
DE102013222596A1 (de) 2015-05-07

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