EP2135264B1 - Circuit magnétique d'électrovanne - Google Patents

Circuit magnétique d'électrovanne Download PDF

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Publication number
EP2135264B1
EP2135264B1 EP08708193A EP08708193A EP2135264B1 EP 2135264 B1 EP2135264 B1 EP 2135264B1 EP 08708193 A EP08708193 A EP 08708193A EP 08708193 A EP08708193 A EP 08708193A EP 2135264 B1 EP2135264 B1 EP 2135264B1
Authority
EP
European Patent Office
Prior art keywords
pole
magnetic
magnetic core
magnetic circuit
disc
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
EP08708193A
Other languages
German (de)
English (en)
Other versions
EP2135264A2 (fr
Inventor
Holger Rapp
Friedrich Boecking
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2135264A2 publication Critical patent/EP2135264A2/fr
Application granted granted Critical
Publication of EP2135264B1 publication Critical patent/EP2135264B1/fr
Active legal-status Critical Current
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Classifications

    • 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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
    • 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
    • F02M2200/9092—Sintered 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
    • 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

Definitions

  • DE 196 50 865 A1 refers to a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve, such as a common rail injection system. About the fuel pressure in the control chamber, 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 which is moved with the armature and acted upon by a valve closing spring in the closing direction, which cooperates with the valve seat of the solenoid valve and thus controls the fuel drain from a control chamber.
  • the magnetic core is made either of powder composite material or of a solid ferromagnetic material.
  • the powder composite material has the advantage that it is electrically substantially nonconductive and thus almost no eddy currents occur which could undesirably affect the force build-up and the force reduction.
  • the magnetic field at the transition from the outer pole of the core, which is usually designed as a pot magnet, to the armature is guided deliberately over a constriction.
  • precisely the edge region of the magnetic core, at which the pole surface overlaps the armature is driven into the region of saturation induction, and the magnetic field strength H increases disproportionately in this region of the core. Since the magnetic field strength in turn determines the flooding demand and thus the power requirement of the magnetic circuit, this leads to an excessive power requirement of magnetic circuits with powder composite cores.
  • the simple solution of Use of a solid core in turn requires the need for elaborate eddy current reduction measures.
  • the invention it is proposed to reset the outer pole of a substantially cup-shaped magnetic core with respect to its axial length and to insert a pole disk made of a ferromagnetic material in the region of the magnetic core which is recessed thereby. It is a ferromagnetic solid material.
  • the pole disc covers at least the outer pole of the magnetic core at least partially.
  • the saturation induction of the pole piece made of solid material is significantly higher than that of the powder composite material from which the magnetic core is made.
  • the powder composite material is ferromagnetic. Eddy currents in the pole piece made of solid material, sound due to the small thickness of the ferromagnetic pole disk by several orders of magnitude faster than would be the case with a solid core of ferromagnetic material.
  • a narrow slot extending essentially in the radial direction may also be provided in the pole disk made of solid ferromagnetic material.
  • the magnetic flux already a much higher cross-sectional area available, compared to the overlap of Polin and anchor.
  • the "bottleneck" for the magnetic flux is in a high material Saturation induction and has no excessive magnetic field strength H result.
  • the powder composite material of the magnetic core is now no longer controlled in the region of its saturation, without this having a negative effect on the induction in the air gap and consequently to the magnetic force. Accordingly, the power consumption of such a designed magnetic circuit is much lower than that in the above to the state of Technique outlined solutions is the case.
  • the lower power requirement can be used either to a simple relief of the control unit power amplifier, or even to leave the rated current of the magnetic circuit unchanged and instead to reduce the number of turns of the coil, and so reduce the voltage required, in particular for the power.
  • the proposed solution according to the invention can also be used to increase the magnetic force. The prerequisite for this is that the armature is not already controlled in the region of its magnetic saturation.
  • the inserted into a recess on an end face of the magnetic core, made of ferromagnetic solid material Polcons be designed such that it also covers the inner pole and the outer pole of the magnetic core and there is a relief of the magnetic core or - in the case of incomplete coverage of mecanicpols - an increase in the air gap induction and thus the achievable magnetic force causes.
  • the inner and therelypol Scheme the ferromagnetic pole disc are connected by narrow webs. These are already at a low coil current in the magnetic saturation and are no longer relevant for further field construction for this reason.
  • FIG. 1 The representation according to FIG. 1 is to be taken from a known from the prior art magnetic circuit of a solenoid valve.
  • a magnetic circuit 10 comprises a magnetic core 12.
  • the magnetic core 12 has a first end face 14 and a second end face 16 and is traversed by a passage opening 18, in which optionally a spring, which acts on an armature 22, may be accommodated.
  • the axis of the magnetic core 12 is identified by reference numeral 20.
  • an integrally formed here anchor 22 which includes an anchor bolt 26 and an integrally formed thereon anchor plate 24.
  • a magnetic coil 28 is inserted in the material of the magnetic core 12.
  • the magnetic core 12 made of a powder composite material is supported on a sleeve 30 preferably made of an amagnetic material.
  • the magnetic core 12 made of powder composite material has the advantage that the powder composite material is electrically substantially nonconductive and, therefore, almost no eddy currents occur in the latter which would undesirably impair the magnetic force build-up and the magnetic force reduction.
  • the powder composite material used as the material for the magnetic core 12 has the disadvantage that there is a small saturation induction of the powder composite material compared to a solid magnetic material.
  • FIG. 1 shows that at a transition point between the magnetic core 12 and the edge region of the armature plate 24, a high field concentration 32 of individual field lines 34 sets.
  • the cross sectional area for the magnetic flux in this area is as shown in FIG FIG. 1
  • the magnetic composite valve shown in the prior art extremely limited, the powder composite material of the magnetic core 12 is controlled in this area to its saturation, which has negative effects on the aspired in the air gap between the second end face 16 and the armature plate 24 high induction B.
  • FIG. 2 shows that the magnetic core 12, which is also made of powder composite material is formed flat on the first end face 14 and in the embodiment in the illustration according to FIG. 2 in the region of the second end face 16 comprises an inner pole 40 and a relation to the inner pole 40 in the axial direction with respect to the axis 20 slightly recessed outer pole 42 includes.
  • a receptacle is formed below the outer pole 42 of the magnetic core 12 into which a pole plate 44 is embedded.
  • the pole plate 44 is preferably made of a ferromagnetic solid material. The saturation induction of the pole disk 44 made of ferromagnetic solid material is significantly higher than that of the powder composite material from which the magnetic core 12 is made.
  • Eddy currents in the pole plate 44 be it with a radial slit, be it formed without a radial slit sound 44 due to the small thickness of the pole plate 44 by a few orders of magnitude faster than would be the case with a massive core of ferromagnetic material.
  • the powder composite material of the magnetic core 12 now no longer needs to be controlled in the region of its saturation, which would have negative effects on the induction in the air gap between the front side of the armature plate 24 of the armature 22 facing the second end face 16 of the magnetic core 12 of powder composite material.
  • the low power requirement of in FIG. 2 shown, as proposed according to the invention optimized magnetic circuit 10 can either be used to a simple discharge of the control unit output stage or even with unchanged rated current of the magnetic circuit 10 to reduce the number of turns of the solenoid 28 can be used.
  • integrally formed armature 22 the proposed solution according to the invention can also be used to increase the magnetic force generated. The prerequisite for this is that in accordance with FIG. 2 one-piece anchor 22 is not already controlled in the region of its magnetic saturation.
  • FIG. 2 shows that in the contact region of the pole plate 44, which in the embodiment according to FIG. 2 only covers the outer pole 42 of the magnetic core made of powder composite material 12, a reduced field concentration 46 is present.
  • a clamping point 48 Between the second end face 16 of the magnetic core made of powder composite material 12, ie the outer pole 42 and a shoulder on a sleeve preferably made of amagmeticianm material is a clamping point 48, on which the pole plate 44 preferably made of ferromagnetic material is arranged in the solenoid valve assembly.
  • the front side of the anchor plate 24 of the representation according to FIG. 2 integrally formed armature 22, with the first end face 16 of the powder composite material manufactured magnetic core 12 determines the residual air gap is identified by reference numeral 50.
  • the pole disc can be removed with an optional inner ring.
  • the pole plate 44 comprises at least one outer ring 52, which in FIG. 2 covers the outer pole 42 of the magnetic core 12 made of powder composite material.
  • the outer ring 52 made of ferromagnetic material Policrobial 44 is in the embodiment according to FIG. 3 a radial slot 54 is formed, which favors the magnetic properties of the pole plate 44 again.
  • the pole piece 44 may be configured to include, in addition to the outer ring 52 covering the outer pole 42, an inner ring 56 which could optionally cover the inner pole 40 of the magnetic core 12 made of powder composite material. This can also be there relief of the magnetic core 12, or in incomplete coverage of the inner pole 40, an increase in the air gap induction and thus an increase in the magnetic force can be achieved.
  • the inner ring 56 and the outer ring 52 of the pole plate 44 made of ferromagnetic solid material by narrow holding webs 60 are interconnected. These are already at a low coil current, with which the magnetic coil 28 of the magnetic circuit 10 is energized, in the magnetic saturation and are therefore no longer relevant to the further field structure.
  • FIG. 3 shows that for the fixation of the inner ring 56, three retaining webs 60 are present, which are positioned at an angle of about 120 ° to each other.
  • three holding webs 60 may also be a smaller or a larger number of retaining webs 60 for fixing the inner ring 56 of the pole plate 44 are used on the outer ring 52.
  • a pole piece 44 may be used which has comparable magnetic properties when made of sintered material or MIM technology instead of a ferromagnetic solid material. The electrical conductivity of such a material largely corresponds to that of a ferromagnetic solid material.

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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)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
  • Electromagnets (AREA)

Claims (8)

  1. Circuit magnétique (10) pour soupape magnétique, destiné à actionner un induit (22) et présentant un goujon d'induit (26) ainsi qu'une plaque d'induit (24) doté d'une bobine magnétique (28) incorporée dans un noyau magnétique (12) en matériau composite pulvérulent, le noyau magnétique (12) comportant un pôle intérieur (40) et un pôle extérieur (42), caractérisé en ce que
    une plaque polaire (44) en matériau ferromagnétique massif qui recouvre au moins en partie le pôle extérieur (42) du noyau magnétique (12) est insérée entre le noyau magnétique (12) et l'induit (22), dans une découpe formée par un retrait de la surface polaire du noyau magnétique (12).
  2. Circuit magnétique (10) selon la revendication 1, caractérisé en ce que la plaque polaire (44) est réalisée en matériau fritté ou par une technique MIM.
  3. Circuit magnétique (10) selon la revendication 1, caractérisé en ce que la plaque polaire (44) insérée dans la découpe formée par un retrait de la surface polaire du noyau magnétique (12) couvre le niveau du pôle extérieur (42) et au moins en partie le niveau du pôle intérieur (40).
  4. Circuit magnétique (10) selon la revendication 1, caractérisé en ce que la plaque polaire (44) est serrée entre une douille (30) réalisée en un matériau à magnétique et un côté frontal (16) du noyau magnétique (12).
  5. Circuit magnétique (10) selon la revendication 4, caractérisé en ce qu'un emplacement de serrage (48) sur lequel la plaque polaire (44) est disposée dans l'ensemble de soupape magnétique est situé entre le côté frontal (16) du noyau magnétique (12) et un appendice de la douille (30) réalisée en un matériau non magnétique.
  6. Circuit magnétique (10) selon la revendication 1, caractérisé en ce que la plaque polaire (44) présente un anneau extérieur (52) qui recouvre le pôle extérieur (42) du circuit magnétique (12) et qui présente au moins une fente radiale (54).
  7. Circuit magnétique (10) selon la revendication 1, caractérisé en ce que la plaque polaire (44) présente un anneau extérieur (52) qui recouvre le pôle extérieur (42) et un anneau intérieur (56) qui recouvre le pôle intérieur (40) du noyau magnétique (12).
  8. Circuit magnétique (10) selon la revendication 7, caractérisé en ce que l'anneau intérieur (56) est relié à l'anneau extérieur (52) de la plaque polaire (44) par au moins deux étroites nervures de maintien (60), l'anneau intérieur (56) de la plaque polaire (44) présentant au moins une fente radiale (58).
EP08708193A 2007-03-07 2008-01-25 Circuit magnétique d'électrovanne Active EP2135264B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710011050 DE102007011050A1 (de) 2007-03-07 2007-03-07 Magnetkreis für Magnetventil
PCT/EP2008/050857 WO2008107224A2 (fr) 2007-03-07 2008-01-25 Circuit magnétique d'électrovanne

Publications (2)

Publication Number Publication Date
EP2135264A2 EP2135264A2 (fr) 2009-12-23
EP2135264B1 true EP2135264B1 (fr) 2013-03-13

Family

ID=39665949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08708193A Active EP2135264B1 (fr) 2007-03-07 2008-01-25 Circuit magnétique d'électrovanne

Country Status (3)

Country Link
EP (1) EP2135264B1 (fr)
DE (1) DE102007011050A1 (fr)
WO (1) WO2008107224A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010026501A1 (de) * 2010-07-07 2012-01-12 Kendrion Binder Magnete Gmbh Druckregelventil
DE102012209175A1 (de) * 2012-05-31 2013-12-05 Robert Bosch Gmbh Magnetbaugruppe für ein Magnetventil

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB865238A (en) * 1957-08-16 1961-04-12 Renault Improvements in or relating to electromagnets
NL7012890A (fr) * 1970-08-31 1972-03-02
DE3332822A1 (de) * 1983-09-12 1985-03-28 Robert Bosch Gmbh, 7000 Stuttgart Magnetventil mit unelastischer ventildichtung
DE3912042A1 (de) * 1988-04-12 1990-01-11 Scholz Joachim Elektromagnet
DE4329760A1 (de) * 1993-09-03 1995-03-09 Bosch Gmbh Robert Elektromagnetisch betätigbares Proportionalventil
US5785298A (en) * 1996-04-15 1998-07-28 Teknocraft, Inc. Proportional solenoid-controlled fluid valve assembly
DE19650865A1 (de) 1996-12-07 1998-06-10 Bosch Gmbh Robert Magnetventil
JP2003156169A (ja) * 2001-09-04 2003-05-30 Denso Corp 電磁式流体制御装置

Also Published As

Publication number Publication date
WO2008107224A2 (fr) 2008-09-12
WO2008107224A3 (fr) 2008-11-20
EP2135264A2 (fr) 2009-12-23
DE102007011050A1 (de) 2008-09-11

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