WO2017089012A1 - Soupape de commande pour injecteur de carburant et injecteur de carburant - Google Patents

Soupape de commande pour injecteur de carburant et injecteur de carburant Download PDF

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Publication number
WO2017089012A1
WO2017089012A1 PCT/EP2016/073286 EP2016073286W WO2017089012A1 WO 2017089012 A1 WO2017089012 A1 WO 2017089012A1 EP 2016073286 W EP2016073286 W EP 2016073286W WO 2017089012 A1 WO2017089012 A1 WO 2017089012A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic core
switching valve
fuel injector
valve according
magnetic
Prior art date
Application number
PCT/EP2016/073286
Other languages
German (de)
English (en)
Inventor
Frank Mertin
Martin Drexel
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 WO2017089012A1 publication Critical patent/WO2017089012A1/fr

Links

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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/081—Magnetic constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/127—Assembling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • 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
    • F02M2200/9007—Ceramic materials
    • 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 relates to a switching valve for a fuel injector with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector, in particular a common rail fuel injector, with such a switching valve.
  • a switching valve of the aforementioned type is used to control the lifting movement of a nozzle needle.
  • the nozzle needle loading hydraulic pressure is raised or lowered in a control room, so that when the pressure is increased, the nozzle needle is acted upon in the closing direction by a hydraulic closing force and relieved at reduced pressure.
  • the nozzle needle opens, d. H. it releases at least one injection port, via which the injection then takes place.
  • German Offenlegungsschrift DE 10 2011 077 179 A1 discloses a solenoid valve for a fuel injection valve of an air-compressing, self-igniting internal combustion engine which comprises an armature composed of an armature plate and an armature shaft.
  • the magnetic circuit of a magnetic actuator of the solenoid valve is closed via the armature plate.
  • priority is given to its magnetic properties.
  • a magnetic material for example iron and / or silicon and / or phosphorus, is selected for the armature.
  • the armature shaft of the armature has several functions. First, the anchor is guided along the length of the armature shaft. Second, a lower portion of the armature shaft closes the solenoid valve.
  • the material of the anchor shaft must therefore in particular a high wear and impact resistance exhibit.
  • a material with a high carbide content is proposed.
  • ceramics, hard metals or cermets should be used as a material. In order to ensure a firm bond, the anchor plate and the anchor shaft are firmly bonded together.
  • the present invention has the object to provide a switching valve for a fuel injector whose robustness is further increased.
  • a wear-related change of the armature stroke should be counteracted in order to avoid a negative armature stroke over the life of the switching valve or at least to keep it as low as possible. Because this can lead to a seat throttling and a concomitant massive decrease in the injection quantity.
  • the switching valve is proposed with the features of claim 1.
  • Advantageous developments of the invention can be found in the dependent claims.
  • a fuel injector in particular a common rail fuel injector, is specified with such a switching valve.
  • the switching valve proposed for a fuel injector in particular for a common rail fuel injector, comprises a magnetic core with an annular recess in which a magnetic coil is accommodated for acting on a liftable armature.
  • the magnetic core has an end face serving as a stroke stop for the armature, via which it is supported on an annular shoulder of a sleeve-shaped component in the axial direction.
  • the magnetic core according to the invention has an annular body made of a non-magnetic material.
  • the ring body must be made of a different material than the magnetic core.
  • the magnetic core is necessarily made of a magnetic material, since the main function of the magnetic core is to amplify the magnetic field generated by the magnetic coil.
  • the magnetic core is made of a material having very good magnetic properties.
  • materials with very good magnetic properties usually have only a low mechanical strength.
  • the magnetic core of the switching valve according to the invention also has the function to form a stroke stop for the armature, this has a disadvantageous effect on the wear resistance of the magnetic core. In particular, there is a risk that the sleeve-shaped component, on which the magnetic core is supported in the axial direction, digs over time into the magnetic core.
  • the magnetic core of the switching valve according to the invention in the region of its support on the sleeve-shaped component has an annular body which is made of a different material than the magnetic core.
  • the material of the ring body can therefore be selected with regard to a high wear resistance.
  • the annular body thus prevents a negative Ankerhubdrift and an associated decrease in the injection quantity.
  • the magnetic core is wholly or partly made of a soft magnetic material, in particular made of pure iron.
  • the magnetic core has a phosphate layer.
  • Soft magnetic materials have particularly good magnetic properties, but at the same time are less resistant to wear. The advantages of the invention therefore come particularly well in this embodiment of the magnetic core to bear.
  • the ring body is made of a ceramic material or of a metal-ceramic composite material. Such materials have a high
  • the annular body is preferably positively, positively and / or materially connected to the magnetic core.
  • the connection prevents a relative movement of the magnetic core relative to the annular body, so that the contact area between the magnetic core and the annular body is also protected against wear.
  • a frictional connection can be effected for example by a press fit of the annular body in the magnetic core.
  • the annular body with a pressing Oversize to form a corresponding recess of the magnetic core.
  • a positive connection can be effected by first making the ring body and then inserting the finished ring body into a mold for producing the magnetic core.
  • the cross section of the annular body is chosen in this case such that the magnetic core engages behind a projecting geometry of the annular body.
  • a cohesive connection can be achieved at the same time.
  • a cohesive connection does not necessarily have to be accompanied by a form fit.
  • the annular body and the magnetic core can also be manufactured together, for example in a powder injection molding process ("Powder Injection Molding", PIM).
  • PIM powder injection molding process
  • the cohesive connection is then carried out in the production of the magnetic core and the ring body in the powder injection molding process. This has the advantage that the magnetic core and the ring body must not be added later, so that this step can be omitted. This has a favorable effect on the production costs.
  • the material of the magnetic core and the material of the annular body have substantially the same thermal expansion coefficient. In this way, thermally induced stresses in the magnetic core can be avoided.
  • the annular body is at least partially embedded in the end face of the magnetic core. This increases the contact area between the annular body and the magnetic core, so that a particularly strong force, positive and / or cohesive connection can be achieved.
  • the magnetic core is biased by means of a spring element, in particular by means of a plate spring, in the axial direction against the annular shoulder of the sleeve-shaped component. Due to the axial bias of the magnetic core is better able to the impact forces of the armature take. In particular, the axial bias counteracts a change in position of the magnetic core due to the impact forces.
  • the magnetic core is penetrated by a central through-hole.
  • the through hole may serve to receive a return spring to return the armature after completion of the energization of the solenoid.
  • a fuel injector for a fuel injection system in particular for a common rail injection system, proposed with a switching valve according to the invention for controlling the injections. Since in the switching valve according to the invention, the risk of wear-related change in the armature stroke, in particular a negative Ankerhubdrift is at least significantly reduced, can be counteracted over the life of the fuel injector seat throttling and thus a decrease in the injection quantity.
  • FIG. 1 shows a schematic longitudinal section through an inventive switching valve in the region of the magnetic coil and the magnetic core according to a first preferred embodiment
  • FIG. 2 is an enlarged view of the magnetic core of the switching valve of FIG. 1,
  • FIG. 3 shows a schematic longitudinal section through the region of the magnetic core support of a switching valve according to the invention according to a second preferred embodiment
  • FIG. 4 shows a schematic longitudinal section through the region of the magnetic core support of a switching valve according to the invention according to a third preferred embodiment.
  • the switching valve according to the invention shown only partially in FIG. 1 comprises a cup-shaped magnetic core 1, in which an annular recess 2 is formed.
  • a magnetic coil 3 is used to act on a trained as a flat armature anchor 4.
  • a magnetic field builds up, the magnetic force of which pulls the armature 4 in the direction of the magnetic core 1 in order to close a working air gap 12 between the armature 4 and the magnetic core 1.
  • the stroke of the armature 4 is limited by the magnetic core 1, so that the armature 4 facing end face 6 of the magnetic core 1 also serves as a stroke stopper 5.
  • the provision of the armature 4 in its initial position is effected by a spring, which is not shown in FIG.
  • the magnetic core 1 has a central through hole 11.
  • the magnetic core 1 is axially biased by a spring element 10, which is presently designed as a plate spring, against an annular shoulder 7 of a sleeve-shaped component 8 axially.
  • the magnetic core 1 is made of a magnetic, in particular soft magnetic material, which has a lower mechanical strength than the material of the sleeve-shaped member 8, the magnetic core 1 for protection against wear inserted into the end face 6 annular body 9 made of a particularly wear-resistant material on.
  • the support of the magnetic core 1 on the annular shoulder 7 of the sleeve-shaped component 8 thus takes place via the annular body 9.
  • the annular body 9 prevents in this way that the sleeve-shaped component 8 digs into the magnetic core 1 over time and thus leads to a negative Ankerhubdrift.
  • FIG. 2 An enlarged view of the annular body 9 is shown in FIG. 2. It has a simple rectangular cross-section and is completely embedded in the magnetic core 1. The connection is made via material connection, since the annular body 9 and the magnetic core 1 have been sintered together in a mold.
  • FIG. 1 An alternative embodiment, in which the annular body 9 and the magnetic core 1 are connected non-positively, is shown in FIG.
  • an annular groove 13 is formed, in which the annular body 9 is pressed.
  • the ring body 9 has over the annular groove 13 of the magnetic core 1 on a press excess.
  • FIG 4 shows an embodiment of a switching valve according to the invention, in which the annular body 9 and the magnetic core 1 are positively connected.
  • the positive connection is achieved here via a waisted cross-sectional shape of the annular body 9, in which the magnetic core 1 engages.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape de commande pour un injecteur de carburant, notamment un injecteur de carburant à rampe commune, comprenant un noyau magnétique (1) pourvu d'un évidement annulaire (2) dans lequel est logée une bobine d'électro-aimant (3) destinée à agir sur une armature (4) pouvant effectuer un mouvement alternatif. Le noyau magnétique (1) présente une face frontale (6) qui sert de butée de fin de course (5) pour l'armature (4) et qui permet au noyau magnétique de prendre appui dans le sens axial sur un épaulement annulaire (7) d'une pièce en forme de douille (8). Selon l'invention, le noyau magnétique (1) présente un corps annulaire (9) en matériau non magnétique dans la zone de contact avec l'épaulement annulaire (7) de la pièce en forme de douille (8). L'invention concerne en outre un injecteur de carburant muni d'une telle soupape de commande.
PCT/EP2016/073286 2015-11-24 2016-09-29 Soupape de commande pour injecteur de carburant et injecteur de carburant WO2017089012A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015223167.4A DE102015223167A1 (de) 2015-11-24 2015-11-24 Schaltventil für einen Kraftstoffinjektor sowie Kraftstoffinjektor
DE102015223167.4 2015-11-24

Publications (1)

Publication Number Publication Date
WO2017089012A1 true WO2017089012A1 (fr) 2017-06-01

Family

ID=57018146

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/073286 WO2017089012A1 (fr) 2015-11-24 2016-09-29 Soupape de commande pour injecteur de carburant et injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102015223167A1 (fr)
WO (1) WO2017089012A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3501973A1 (de) * 1984-01-23 1985-07-25 Nippondenso Co., Ltd., Kariya, Aichi Brennstoff-einspritzduese
EP0971278A1 (fr) * 1998-07-07 2000-01-12 Fasco Controls Corporation Electrovanne avec capteur de pression
DE10136705A1 (de) * 2000-07-28 2002-03-07 Nippon Soken Elektromagnetventil
DE102009001706A1 (de) * 2009-03-20 2010-09-23 Robert Bosch Gmbh Restluftspaltscheibe
EP2253830A1 (fr) * 2009-05-19 2010-11-24 Robert Bosch GmbH Groupe d'aimants à baïonnette
DE102011077179A1 (de) 2011-06-08 2012-12-13 Robert Bosch Gmbh Anker für ein Magnetventil und Verfahren zur Herstellung eines Ankers
EP2905460A1 (fr) * 2014-02-10 2015-08-12 Robert Bosch Gmbh Plaque d'écartement pour l'air résiduel pour un composant magnétique d'une électrovanne et procédé de fabrication d'une plaque d'écartement pour l'air résiduel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3501973A1 (de) * 1984-01-23 1985-07-25 Nippondenso Co., Ltd., Kariya, Aichi Brennstoff-einspritzduese
EP0971278A1 (fr) * 1998-07-07 2000-01-12 Fasco Controls Corporation Electrovanne avec capteur de pression
DE10136705A1 (de) * 2000-07-28 2002-03-07 Nippon Soken Elektromagnetventil
DE102009001706A1 (de) * 2009-03-20 2010-09-23 Robert Bosch Gmbh Restluftspaltscheibe
EP2253830A1 (fr) * 2009-05-19 2010-11-24 Robert Bosch GmbH Groupe d'aimants à baïonnette
DE102011077179A1 (de) 2011-06-08 2012-12-13 Robert Bosch Gmbh Anker für ein Magnetventil und Verfahren zur Herstellung eines Ankers
EP2905460A1 (fr) * 2014-02-10 2015-08-12 Robert Bosch Gmbh Plaque d'écartement pour l'air résiduel pour un composant magnétique d'une électrovanne et procédé de fabrication d'une plaque d'écartement pour l'air résiduel

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Publication number Publication date
DE102015223167A1 (de) 2017-05-24

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