EP3322891B1 - Soupape de commutation pour injecteur de carburant et injecteur de carburant - Google Patents

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

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Publication number
EP3322891B1
EP3322891B1 EP16732669.3A EP16732669A EP3322891B1 EP 3322891 B1 EP3322891 B1 EP 3322891B1 EP 16732669 A EP16732669 A EP 16732669A EP 3322891 B1 EP3322891 B1 EP 3322891B1
Authority
EP
European Patent Office
Prior art keywords
armature
switching valve
sleeve
valve according
fuel injector
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.)
Active
Application number
EP16732669.3A
Other languages
German (de)
English (en)
Other versions
EP3322891A1 (fr
Inventor
Michael Krause
Lars Olems
Tilman Miehle
Stephan Amelang
Thomas Nierychlo
Oezguer Tuerker
Axel Schnaufer
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 EP3322891A1 publication Critical patent/EP3322891A1/fr
Application granted granted Critical
Publication of EP3322891B1 publication Critical patent/EP3322891B1/fr
Active 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0073—Pressure balanced valves
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8046—Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal
    • 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

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.
  • a solenoid valve for a fuel injector of an air-compression type auto-ignition 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 respectively.
  • a material with a high carbide content is proposed.
  • ceramics, hard metals or cermets should be used as a material.
  • the anchor plate and the anchor shaft are firmly bonded together. Also from the EP 2 816 574 A2 Such a solenoid valve is known.
  • the present invention has the object to provide a switching valve for a fuel injector, which has an increased robustness, in particular with regard to thermal influences, and therefore a higher reliability.
  • 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 proposed switching valve comprises a liftable armature, which is penetrated by an axial bore for receiving and guiding a relative to the armature movable anchor bolt.
  • the armature has an axial bore at least partially limiting sleeve of a ceramic material. This means that in each case a ceramic material is included, which increases the wear resistance of the armature.
  • ceramic materials have a comparatively low thermal conductivity. Due to the arrangement of the ceramic material in the region of the guide of the anchor bolt in the armature a kind of thermal separation between the armature and the anchor bolt is thus achieved, which protects the anchor from the regularly occurring in the region of the high temperatures. This has the consequence that the temperature coefficient of the switching valve is lower. In particular, the armature stroke is removed from thermal influences, so that the reliability increases with the accuracy of the armature stroke.
  • the advantages mentioned above occur most clearly when using a ceramic sleeve in the guide region of the armature.
  • the use of a metal-ceramic composite has the advantage of simplifying the manufacture of the anchor.
  • the metal and ceramic components in the composite material are to be chosen such that it has sufficient magnetic properties and at the same time a low thermal conductivity.
  • the ceramic sleeve extends to at least one end face of the armature.
  • the sleeve is guided over the entire axial extent of the armature. That is, the axial bore serving to guide the anchor bolt is completely lined by the sleeve. In this way, a particularly effective thermal separation is effected.
  • at least one end face of the ceramic sleeve can be used as a stop and / or sealing surface, which in turn has a reducing effect on the wear.
  • the armature or the sleeve forms a sealing contour which cooperates sealingly with a valve seat of the switching valve.
  • a separate valve closing element is thus dispensable, which simplifies the construction of the switching valve.
  • the armature forms the sealing contour, it is preferably formed on a shaft-like section of the armature, which furthermore preferably is formed of a metal-ceramic composite material.
  • the sleeve forms the sealing contour, it is preferably realized on a collar portion of the sleeve in order to increase the wear resistance of the armature and the valve piece in the region of the sealing contour.
  • the material of the anchor and the material of the sleeve - if one is provided - have substantially the same coefficient of thermal expansion. This measure helps to avoid thermally induced stresses in the armature.
  • Zirconium oxide (ZrO 2 ) is preferably used as the ceramic material.
  • zirconium oxide has essentially the same coefficient of thermal expansion as, for example, steel.
  • the ceramic material of the sleeve is therefore likewise preferably zirconium oxide or at least zirconium oxide is contained in the ceramic material of the sleeve.
  • the thermal conductivity of zirconium oxide is about 2 to 3 W / mK and is thus significantly below that of steel (about 40 to 60 W / mK), so that this material is ideal for forming a thermal separation between the anchor and the anchor bolt.
  • armature surrounding the sleeve With regard to the required magnetic properties of the armature surrounding the sleeve, it is proposed that this be made wholly or partly of a ferromagnetic material, in particular of an iron-cobalt alloy. The focus in this case is clearly on the magnetic properties of the armature, while the wear resistance is ensured by the ceramic sleeve.
  • a fuel injector for a fuel injection system in particular a common rail injection system, proposed with a switching valve according to the invention for controlling the injections. Since the switching valve according to the invention is particularly insensitive to temperature, not only increases the reliability of the switching valve, but also that of the fuel injector. The injections can thus be precisely controlled.
  • That in the Fig. 1 illustrated switching arm comprises a trained as a flat armature anchor 1 with a plate-shaped portion 11 and a shaft-like portion 9.
  • the shaft-like portion 9 has an end face 5, which forms a cooperating with a valve seat 7 of the switching valve sealing contour 8.
  • the anchor 1 is penetrated by an axial bore 3.
  • the guide portion of the armature 1 is subjected to high mechanical stress during operation of the switching valve. It is therefore necessary to increase the mechanical strength of the armature 1 at least in the region of the guide. In addition, 12 high temperatures can develop in the guide gap, which in turn can have an influence on the stroke of the armature 1.
  • the armature 1 of the switching valve has the Fig. 1 a the axial bore 3 limiting ceramic sleeve 4, which can be firmly connected to the anchor 1.
  • the ceramic sleeve 4 not only increases the wear resistance of the armature 1 in the guide region, but also its temperature insensitivity. Because of the ceramic material of the sleeve 4 causes due to its comparatively low thermal conductivity, a thermal separation of the armature 1 from the anchor bolt 2, so that the temperature coefficient of the armature stroke is significantly reduced.
  • the ceramic material in the form of the sleeve 4 is restricted to the guide region, high magnetic forces can continue to be achieved.
  • the armature 1 can be made of a ferromagnetic material, for example of an iron-cobalt alloy.
  • this may otherwise be formed from a metal-ceramic composite material, provided that this material has satisfactory magnetic properties.
  • the anchor 1 completely from such a metal-ceramic composite material.
  • the Fig. 2 is a modification of the switching valve of Fig. 1 refer to.
  • the modification consists in a modified embodiment of the sleeve 4. For this is guided to the end face 5 of the shaft-like portion 9 of the armature 1 and has a collar portion 10, which now forms the cooperating with the valve seat 7 sealing contour 8.
  • the high wear resistance of the ceramic material of the sleeve 4 thus also comes into play in the region of the sealing seat.
  • the switching valve corresponds to the Fig. 2 the the Fig. 1 ,
  • the in the Fig. 1 and 2 shown switching valves work as follows: If a ring-shaped magnetic coil 13 arranged above the armature 1 is energized, a magnetic field is formed whose magnetic force moves the armature 1 upwards until it abuts against a pole body 14 with an end face 6. The armature 1 lifts off from the valve seat 7 and the switching valve opens. To close the switching valve, the energization of the solenoid 13 is terminated, so that the spring force of an armature spring 15, which is indirectly supported via an adjusting ring 16 on the end face 6 of the armature 1, the armature 1 is returned to the valve seat 7 and closes the switching valve.

Landscapes

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

Claims (9)

  1. Soupape de commutation pour un injecteur de carburant, notamment pour un injecteur de carburant à rampe commune, qui comprend une ancre (1) pouvant se déplacer selon un mouvement de levage et qui comporte une section (9) de type tige traversée par un alésage axial (3) destiné à loger et à guider un boulon d'ancre (2) mobile par rapport à l'ancre (1) ;
    caractérisée en ce que :
    l'ancre (1) comporte une douille (4) délimitant au moins en partie l'alésage axial (3) et se composant d'une matière céramique, la douille (4) revêtant entièrement l'alésage axial (3) et servant au guidage du boulon d'ancre (2).
  2. Soupape de commutation selon la revendication 1, caractérisée en ce que la douille (4) s'étend jusqu'à au moins une surface avant (5, 6) de l'ancre (1).
  3. Soupape de commutation selon la revendication 1 ou 2, caractérisée en ce que l'ancre (1) ou la douille (4) forme un contour étanche (8) qui interagit de façon étanche avec un siège de soupape (7) de la soupape de commutation, le contour étanche (8) étant de préférence réalisé au niveau d'une section (9) de type tige de l'ancre (1) ou au niveau d'une section de liaison (10) de la douille (4).
  4. Soupape de commutation selon l'une quelconque des revendications précédentes, caractérisée en ce que l'ancre (1) et/ou la douille (4) est fabriquée et/ou sont fabriquées selon un procédé de moulage par injection de poudre.
  5. Soupape de commutation selon l'une quelconque des revendications précédentes, caractérisée en ce que la douille (4) est reliée de façon permanente à l'ancre (1) .
  6. Soupape de commutation selon l'une quelconque des revendications précédentes, caractérisée en ce que la matière de l'ancre (1) et la matière de la douille (4) possèdent pour l'essentiel le même coefficient de dilatation thermique.
  7. Soupape de commutation selon l'une quelconque des revendications précédentes, caractérisée en ce que la matière céramique de la douille (4) est en oxyde de zirconium ou elle en contient.
  8. Soupape de commutation selon l'une quelconque des revendications précédentes, caractérisée en ce que l'ancre (1) est entièrement ou en partie fabriquée à partir d'un matériau ferromagnétique, notamment à partir d'un alliage de fer et de cobalt.
  9. Injecteur de carburant pour un système d'injection de carburant, notamment pour un système à rampe commune d'injection, avec une soupape de commutation selon l'une quelconque des revendications précédentes destinée à commander les injections.
EP16732669.3A 2015-07-14 2016-06-29 Soupape de commutation pour injecteur de carburant et injecteur de carburant Active EP3322891B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015213141.6A DE102015213141A1 (de) 2015-07-14 2015-07-14 Schaltventil für einen Kraftstoffinjektor sowie Kraftstoffinjektor
PCT/EP2016/065088 WO2017009041A1 (fr) 2015-07-14 2016-06-29 Soupape de commutation pour injecteur de carburant et injecteur de carburant

Publications (2)

Publication Number Publication Date
EP3322891A1 EP3322891A1 (fr) 2018-05-23
EP3322891B1 true EP3322891B1 (fr) 2019-08-07

Family

ID=56263727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16732669.3A Active EP3322891B1 (fr) 2015-07-14 2016-06-29 Soupape de commutation pour injecteur de carburant et injecteur de carburant

Country Status (5)

Country Link
EP (1) EP3322891B1 (fr)
KR (1) KR102551023B1 (fr)
CN (1) CN107835896B (fr)
DE (1) DE102015213141A1 (fr)
WO (1) WO2017009041A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016209813A1 (de) * 2016-06-03 2017-12-07 Robert Bosch Gmbh Magnetventil und Kraftstoffinjektor mit einem Magnetventil

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2480083C (fr) * 2002-03-22 2012-01-24 Chrysalis Technologies Inc0Rporated Injecteur de moteur a combustion interne
DE102005053115A1 (de) * 2005-11-08 2007-05-10 Robert Bosch Gmbh Optimierte Ankergruppenführung für Magnetventile
US8070464B2 (en) * 2007-06-01 2011-12-06 Caterpillar Inc. Retention system
DE102007060396A1 (de) * 2007-12-03 2009-06-04 Robert Bosch Gmbh Mechanische Löschung von Schließprellern bei Einspritzdüsen
DE102008002717A1 (de) * 2008-06-27 2010-01-14 Robert Bosch Gmbh Kraftstoffinjektor mit zweiteiligem Magnetanker
DE102011077179A1 (de) 2011-06-08 2012-12-13 Robert Bosch Gmbh Anker für ein Magnetventil und Verfahren zur Herstellung eines Ankers
DE102011078407A1 (de) * 2011-06-30 2013-01-03 Robert Bosch Gmbh Schaltventil zur Steuerung eines Kraftstoffinjektors und Kraftstoffinjektor
DE102012209229A1 (de) * 2012-05-31 2013-12-05 Robert Bosch Gmbh Kraftstoffinjektor
DE102013211294A1 (de) * 2013-06-17 2014-12-18 Robert Bosch Gmbh Anker für ein Magnetventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
KR102551023B1 (ko) 2023-07-05
CN107835896A (zh) 2018-03-23
KR20180030622A (ko) 2018-03-23
WO2017009041A1 (fr) 2017-01-19
EP3322891A1 (fr) 2018-05-23
CN107835896B (zh) 2021-06-08
DE102015213141A1 (de) 2017-01-19

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