WO2010000516A1 - Électrovanne à délimitation d'entrefer concave - Google Patents

Électrovanne à délimitation d'entrefer concave Download PDF

Info

Publication number
WO2010000516A1
WO2010000516A1 PCT/EP2009/055339 EP2009055339W WO2010000516A1 WO 2010000516 A1 WO2010000516 A1 WO 2010000516A1 EP 2009055339 W EP2009055339 W EP 2009055339W WO 2010000516 A1 WO2010000516 A1 WO 2010000516A1
Authority
WO
WIPO (PCT)
Prior art keywords
solenoid valve
armature
air gap
magnetic core
residual air
Prior art date
Application number
PCT/EP2009/055339
Other languages
German (de)
English (en)
Inventor
Holger Rapp
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 WO2010000516A1 publication Critical patent/WO2010000516A1/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
    • 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
    • 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

Definitions

  • DE 196 50 865 A1 relates to a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve, such as e.g. a common-rail high-pressure accumulator injection system.
  • a stroke movement of a valve piston is controlled, with which an injection port of the injection valve is opened or closed.
  • the solenoid valve comprises an electromagnet, a movable armature and a valve member moved by the armature and acted upon by a valve closing spring in the closing direction. This interacts with the valve seat of the solenoid valve and controls the fuel drain from the control chamber.
  • the swing occurring during operation of the armature and / or bouncing of the valve member has a disadvantageous effect.
  • a ringing of the impinging on the valve seat anchor plate this takes an undefined position.
  • different opening times of the solenoid valve occur and thus a scattering of the start of injection and the injection quantity.
  • the armature of the solenoid valve is designed as a two-part magnet armature so as to reduce the moving mass of the unit armature / valve member and thus the bouncing kinetic energy.
  • the two-piece executed anchor comprises an anchor bolt and an anchor bolt on the anchor bolt against the force of a return spring in the closing direction of the valve member under the action of their inertial mass slidably received anchor plate which is secured by a locking washer and a surrounding securing sleeve on the anchor bolt.
  • the locking sleeve and the locking washer are enclosed by the magnetic core, which, however, results in an increased space requirement and leads to a higher diameter in the magnetic core. Due to the higher diameter of the magnetic core in turn results in a limitation of the magnetic flux.
  • the dimensioning of the abutment surface is difficult because, due to the magnetic / hydraulic bonding, a very small abutment surface is required, which, however, can again lead to bouncing of the valve element when its upper stroke stop is reached.
  • Another problem is to guarantee the durability of the abutment surfaces, especially when the magnetic core is made of a very soft material. Again, often costly additional measures to improve the stability of the stop surfaces are necessary.
  • Another way to ensure the lowest possible residual distance and permanently maintain is to insert a thin, made of non-magnetic material disc between the valve element and the magnetic core.
  • This disk usually has a thickness of less than 0.1 mm.
  • the shape of this disc is designed so that bouncing of the valve element is avoided when striking the magnetic core by hydraulic damping.
  • it may be in the closing operation of the solenoid valve for adhering the disc to the valve element, i. come on the armature and / or the magnetic core, wherein the expression of the adjusting adhesive affects the refilling of the gap between the valve element and the core (nip) and thus the closing operation of the valve element.
  • the result is a variable, not reproducible valve dynamics during the closing process from control to control and / or injector to injector and / or over its life.
  • Another advantage of the proposed solution according to the invention lies in the reduction of the power requirement of the solenoid valve or of its magnet group for actuating a fuel injector. According to the invention, it is proposed to form the armature of an armature assembly of the solenoid valve at its pole face substantially concave.
  • the adhesiveness of the pane with its side facing the anchor or its plan side is considerably reduced in each case. If a flatness deviation of the armature or of its plan side can be kept small, there is a very small gap between the plan side of the armature and the disc, from which the fuel must be displaced and which is commonly referred to as a nip, shortly before reaching the stop. This serves for hydraulic damping to avoid bouncing of the valve element when reaching its upper stroke stop. Bouncing is understood to mean an unintended re-exit of a stop once reached by a valve element, which is triggered by a reverberation of moving components.
  • the inventively proposed, substantially concave surface formation of the armature can be made directly, for example by grinding the pole face and requires no additional process step.
  • Another advantage of the proposed solution according to the invention is to be seen in the fact that the distance between the magnetic core and the valve element in the region of the outer pole automatically decreases in comparison to a flat-shaped pole surface geometry on the end face of the magnetic core.
  • a comparable shape of the gap between the magnetic core and the valve element can be achieved if instead of the armature of the magnetic core of the magnetic group has a substantially concave surface formation.
  • FIG. 1 shows a magnet group of a magnet valve according to the prior art, in which an armature has a shoulder
  • Figure 2 shows another embodiment of a magnetic group with a residual air gap defining residual air gap disk between the front side of the magnetic core and
  • FIG. 1 shows that a solenoid valve 10, with which in particular a fuel injector of a high-pressure accumulator injection system (common rail) can be actuated, has a magnet group 12.
  • the magnet group 12 in turn comprises a magnetic coil 14 embedded in a magnetic core 15.
  • the front side of the magnetic core 15 opposite is an anchor group 16, which has an anchor plate 18.
  • Their plan page 20 is flat in the illustration of Figure 1 and has a stop 36 on the front side of the magnetic core 15 to.
  • the anchor plate 18 furthermore has a valve element 22, which is only indicated in the illustration according to FIG. sleeve-shaped.
  • the valve element 22 closes or opens a valve seat, which is not shown in the illustration according to FIG. 1, via which a control chamber acted upon by fuel under system pressure is depressurized or pressurized.
  • the armature plate 18 of the armature group 16 is acted upon by a closing force 24, which is generated by a closing spring (not shown in FIG. 1).
  • the magnet group 12 generates a magnetic force opposing the closing force 24, with which the armature plate 18 of the armature group 16 with the valve element 22 received thereon is opened against the action of the closing force 24, so that fuel flows out of the aforementioned control chamber.
  • the magnet group 12 shown in FIG. 1 is constructed symmetrically with respect to the axis 26, wherein the armature group 16, like the magnet group 12, is located in a low-pressure space filled with fuel 28. In this low-pressure space of the fuel diverted by the valve element 22 is opened when opening a valve seat, which consequently surrounds the magnet group 12 and the armature group 16.
  • the plan side 20 of the armature plate 18 assigning end face of the magnet group 12 having the recessed magnetic coil 14 which separates an inner pole 30 of the magnetic core 15 of the outer pole 32.
  • the resulting from the recessed arrangement of the magnetic coil 14 stage is indicated by reference numeral 34.
  • FIG. 1 further shows that the inner pole 30 has a stop 36, which is e.g. may be formed as a separate ring or the like.
  • the plan side 20 of the anchor plate 18 shown in Figure 1 also has a ground paragraph 38, which forms the counterpart to the annular configured stop 36 on the inner pole 30 of the magnetic core 15.
  • the residual air gap disk 44 is typically made of a non-magnetic material and has a thickness of about 0.1 mm or less. Due to the thickness of the residual air gap disk 44, an air gap 40 is generated whose gap height 42 corresponds to the thickness of the residual air gap disk 44.
  • the Restluftspaltopathy 44 of non-magnetic material is located both on the stop 36 of the inner pole 30, which runs flat, as well as on the plan formed plan side 20 of the anchor plate 18, on which the sleeve-shaped valve member 22 extends.
  • the armature plate 18 and the magnet group 12 according to the configuration in FIG. 2 are also located in the low-pressure space of a fuel injector and are surrounded by fuel 28. Both the magnet group 13 and the valve element 22 and the integrally formed therewith armature plate 18 are symmetrical to the axis 26 executed.
  • FIG. 3 shows the solution of a solenoid valve proposed according to the invention.
  • the solenoid valve 10 also includes the magnetic group 12, in which the magnetic coil 14 is embedded.
  • the armature plate 18 assigning end face of the magnetic core 15 is divided into the inner pole 30 and the outer pole 32.
  • the magnetic coil 14 is recessed by the step 34.
  • the inner pole 30 represents a stop 36 for a first surface 52 of the preferably non-magnetic material produced residual air gap disc 44.
  • the anchor plate 18 has an armature pole face 46 which has a substantially concave surface formation 48.
  • the substantially concave surface formation 48 on the armature pole surface 46 of the armature plate 18 causes a contact ring 50 to form on approaching the armature pole surface 46 to a second planar side 54 of the residual air gap disc 44 only in its outer region.
  • the contact area between the Ankerpol requirements 46 and the second plan side 54 of the residual air gap disc 44 compared to the solutions according to the prior art is many times smaller, so that hydraulic bonding significantly reduced, ideally can be completely avoided.
  • annular contact region 50 between the substantially concave surface formation 48 of the armature pole 46 of the second plan side 54 of the residual air gap 44 of preferably non-magnetic material and individual contact points between the substantially concave surface formation 48 of the Ankerpol requirements 46 and the second Surface 54 of the residual air gap disc 44 are created.
  • the residual air gap disc 44 which is preferably made of non-magnetic material is made to provide at its outer edge with individual slots.
  • individual contact points between the substantially concave surface formation 48 of the armature surface 46 and the tongues separated from each other by the slots in the remaining material of the residual air gap disc 44 are preferably made of non-magnetic material.
  • the adhesiveness of the residual air gap disk 44 with respect to the armature surface 46 of the armature 18 is considerably reduced. If the flatness deviation of the armature pole face 46 of the armature 18 can be kept small, there is shortly before reaching the stop 36, i. of the contact ring 50 or the contact points that form, nevertheless a very narrow wedge-shaped nip 58, in which a volume of fuel 28 can be compressed.
  • the wedge-shaped nip 58 which adjusts due to the substantially concave surface formation 48 between the second plane side 54 of the residual air gap disc 44 and the Ankerpol nature 46, runs starting from the contact ring 50 and the adjusting contact points in the radial direction inwards.
  • the wedge-shaped nip 58 accordingly opens in the radial direction inwards in the direction of the axis 26. Due to the trapped in the nip 58 fuel volume, which is compressed at the approach of the armature pole 46 to the residual air gap plate 44, thus still the occurrence of Prellerscheinened the valve element 18, 22 when reaching the upper Hubanschlages, ie the residual air gap disc 44 can be avoided.
  • the substantially concave surface formation 48 of the armature pole face 42 is produced directly, for example, during grinding of the armature pole face 46 and does not require any additional process step.
  • An additional advantage to be achieved with the solution proposed according to the invention is that a distance 56 between the magnetic core 15, in particular its outer pole 32, and the armature pole surface 46 with a substantially concave surface formation 48 decreases in comparison to the planar pole surface geometry.
  • the requirements to be placed on the control unit for actuating the fuel injector 10 or its magnet group can also be considerably simplified.
  • the solution proposed according to the invention has been described on the basis of an armature pole surface 46 having a substantially concave surface formation 48
  • the substantially concave surface formation 48 can just as well be based on the principle of kinematic reversal at the end face the magnet group 12, in particular on the end face of the magnetic core 15, be executed.
  • the same effect can be achieved as with the formation of a substantially concave surface formation 48 in the region of the armature pole surface 46 or alternatively in the end face of the magnetic core 15, which assigns the armature group 16.

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

Abstract

L'invention concerne une électrovanne (10) comportant un ensemble magnétique (12) comprenant une bobine magnétique (14) et un noyau magnétique (15). L'électrovanne (10) comporte en outre une armature (18) et un élément de soupape (22), ainsi qu'une butée (36) dans la zone d'une face frontale du noyau magnétique (15). L'invention est caractérisée en ce que soit la face frontale du noyau magnétique (15) soit une face polaire (46) de l'armature (18) présente une surface (48) à géométrie sensiblement concave.
PCT/EP2009/055339 2008-07-02 2009-05-04 Électrovanne à délimitation d'entrefer concave WO2010000516A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008040068.8A DE102008040068B4 (de) 2008-07-02 2008-07-02 Konkave Luftspaltbegrenzung bei Magnetventil
DE102008040068.8 2008-07-02

Publications (1)

Publication Number Publication Date
WO2010000516A1 true WO2010000516A1 (fr) 2010-01-07

Family

ID=40943565

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/055339 WO2010000516A1 (fr) 2008-07-02 2009-05-04 Électrovanne à délimitation d'entrefer concave

Country Status (2)

Country Link
DE (1) DE102008040068B4 (fr)
WO (1) WO2010000516A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012111196A1 (fr) 2011-02-16 2012-08-23 オムロン株式会社 Système de détection d'objet

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2829719A1 (fr) * 2013-07-23 2015-01-28 Delphi International Operations Luxembourg S.à r.l. Soupape électromagnétique
GB201513847D0 (en) * 2015-08-05 2015-09-16 Delphi Int Operations Luxembourg Sarl Actuator arrangement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0184126A1 (fr) * 1984-12-06 1986-06-11 VDO Adolf Schindling AG Injecteur de combustible à commande électromagnétique
DE4131500A1 (de) * 1991-09-21 1993-03-25 Bosch Gmbh Robert Elektromagnetisch betaetigbares einspritzventil
US6267350B1 (en) * 1999-05-19 2001-07-31 Hydraforce, Inc. Valve having a mechanism for controlling a nonlinear force
US20050189512A1 (en) * 2004-02-27 2005-09-01 Takashi Kaneko Electromagnetic valve gear

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4108665C2 (de) 1990-05-26 1997-04-10 Bosch Gmbh Robert Einstellbuchse für ein elektromagnetisch betätigbares Ventil
DE19650865A1 (de) 1996-12-07 1998-06-10 Bosch Gmbh Robert Magnetventil
DE19708104A1 (de) 1997-02-28 1998-09-03 Bosch Gmbh Robert Magnetventil
DE10016599A1 (de) 1999-11-16 2001-05-17 Continental Teves Ag & Co Ohg Elektromagnetventil
DE10311486A1 (de) 2002-09-27 2004-04-08 Continental Teves Ag & Co. Ohg Elektromagnetventil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0184126A1 (fr) * 1984-12-06 1986-06-11 VDO Adolf Schindling AG Injecteur de combustible à commande électromagnétique
DE4131500A1 (de) * 1991-09-21 1993-03-25 Bosch Gmbh Robert Elektromagnetisch betaetigbares einspritzventil
US6267350B1 (en) * 1999-05-19 2001-07-31 Hydraforce, Inc. Valve having a mechanism for controlling a nonlinear force
US20050189512A1 (en) * 2004-02-27 2005-09-01 Takashi Kaneko Electromagnetic valve gear

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012111196A1 (fr) 2011-02-16 2012-08-23 オムロン株式会社 Système de détection d'objet

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Publication number Publication date
DE102008040068B4 (de) 2019-07-18
DE102008040068A1 (de) 2010-01-07

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