WO2008107224A2 - Circuit magnétique d'électrovanne - Google Patents

Circuit magnétique d'électrovanne Download PDF

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Publication number
WO2008107224A2
WO2008107224A2 PCT/EP2008/050857 EP2008050857W WO2008107224A2 WO 2008107224 A2 WO2008107224 A2 WO 2008107224A2 EP 2008050857 W EP2008050857 W EP 2008050857W WO 2008107224 A2 WO2008107224 A2 WO 2008107224A2
Authority
WO
WIPO (PCT)
Prior art keywords
pole
magnetic
magnetic core
magnetic circuit
armature
Prior art date
Application number
PCT/EP2008/050857
Other languages
German (de)
English (en)
Other versions
WO2008107224A3 (fr
Inventor
Holger Rapp
Friedrich Boecking
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
Priority to EP08708193A priority Critical patent/EP2135264B1/fr
Publication of WO2008107224A2 publication Critical patent/WO2008107224A2/fr
Publication of WO2008107224A3 publication Critical patent/WO2008107224A3/fr

Links

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 relates 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 virtually 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 throughput requirement and thus the current 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.
  • a pole disk made of a ferromagnetic material in the region thereby recessed.
  • This is preferably a ferromagnetic massive material.
  • the saturation induction of the preferably made of solid material Polusion 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.
  • a significantly higher cross-sectional area is already available to the magnetic flux, in comparison to the overlapping point of pole disk and armature.
  • the "bottleneck" for the magnetic flux is in a material with high saturation induction and results in no excessive magnetic field strength H.
  • the powder composite of the magnetic core is now no longer driven into the region of its saturation, without negatively affecting the induction Consequently, the power requirement of a magnetic circuit designed in this way is also considerably lower than is the case with the solutions outlined above with reference to the prior art. or also to leave the rated current of the magnetic circuit unchanged and instead to reduce the number of turns of the coil, and thus to reduce the voltage required, in particular for the force buildup Solution 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 Policrobial be designed such that it also covers the inner pole and the outer pole of the magnetic core and there also a discharge of the magnetic core or - in the case of incomplete Abde- Cushioning of the inner pole - an increase in the air gap induction and thus the achievable magnetic force causes.
  • the inner and the outer pole region of the ferromagnetic Polhunt are interconnected 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 shows the representation of a magnetic circuit with a powder composite magnetic core according to the prior art
  • Figure 2 shows the representation of the invention proposed magnetic circuit with recessed outer pole of the magnetic core
  • FIG. 3 is a plan view of the pole disk made of ferromagnetic solid material and inserted in a recess on the outer pole of the magnetic core with optionally slits.
  • FIG. 1 shows a magnetic circuit of a solenoid valve known from the prior art.
  • FIG. 1 shows that 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 armature 22 which is formed in one piece and which comprises an armature pin 26 and an armature plate 24 integrally formed thereon.
  • a magnetic coil 28 is inserted in the material -A- 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 composite powder material is essentially electrically nonconductive, and therefore virtually 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 however, has the disadvantage that there is a small saturation induction of the powder composite compared to a massive Magnetmateri- al.
  • the illustration according to FIG. 1 shows that a high field concentration 32 of individual field lines 34 is established at a transition point between the magnetic core 12 and the edge region of the armature plate 24.
  • the cross-sectional area for the magnetic flux in this area is extremely limited in the case of the magnetic valve shown in the illustration according to FIG. 1, the powder composite material of the magnetic core 12 is controlled in this area until it saturates, which has negative effects on the air gap between the second end face 16 and the anchor plate 24 aspired high induction B has.
  • FIG. 2 shows an optimized magnetic circuit of the solution proposed according to the invention.
  • Figure 2 shows that the magnetic core 12, which is also made of powder composite material is flat on the first end face 14 and in the embodiment in the representation of Figure 2 in the region of the second end face 16 an inner pole 40 and one with respect to the inner pole 40 in axial Direction with respect to the axis 20 slightly explain
  • th outer pole 42 includes.
  • 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 they 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 for a solid 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 power consumption of the magnetic circuit 10 shown in FIG. 2 is less than that in the magnetic circuit shown in connection with FIG.
  • the low power consumption of the illustrated in Figure 2, as proposed in the invention optimized magnetic circuit 10 can either be used for 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.
  • the proposed solution according to the invention can also be used to increase the magnetic force generated.
  • the prerequisite for this is that the armature 22, which is formed integrally in the representation according to FIG. 2, is not already controlled in the region of its magnetic saturation.
  • 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 preferably made of amag- matic material sleeve is a clamping point 48, on which the pole plate 44 preferably made of ferromagnetic solid material is arranged in the solenoid valve assembly.
  • the front side of the armature plate 24 of the integrally formed in the representation of Figure 2 anchor 22, which is connected to the first end face 16 of the powder from composite material manufactured magnetic core 12 determines the residual air gap is identified by reference numeral 50.
  • FIG. 3 shows the pole disk, with an optional inner ring.
  • the pole disk 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 of the pole plate 44 made of ferromagnetic material in the embodiment according to FIG. 3, a radial slot 54 is formed, which further favors the magnetic properties of the pole disk 44.
  • 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 disk 44 made of ferromagnetic solid material are interconnected by narrow holding webs 60. 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.

Abstract

L'invention concerne un circuit magnétique (10) d'électrovanne pour actionner un induit (22) présentant un boulon d'induit (26) et une plaque d'induit (24). Le circuit magnétique (10) comprend un noyau magnétique (12) à base de matériau composite pulvérulent dans lequel est noyée une bobine d'excitation (28). Ladite bobine d'excitation (12) contient un pôle intérieur (40) et un pôle extérieur (42). Un disque polaire (44) recouvrant au moins le pôle extérieur (42) du noyau magnétique (12) et consistant en matériau ferromagnétique se trouve entre le noyau magnétique (12) et l'induit (22).
PCT/EP2008/050857 2007-03-07 2008-01-25 Circuit magnétique d'électrovanne WO2008107224A2 (fr)

Priority Applications (1)

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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007011050.4 2007-03-07
DE200710011050 DE102007011050A1 (de) 2007-03-07 2007-03-07 Magnetkreis für Magnetventil

Publications (2)

Publication Number Publication Date
WO2008107224A2 true WO2008107224A2 (fr) 2008-09-12
WO2008107224A3 WO2008107224A3 (fr) 2008-11-20

Family

ID=39665949

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/050857 WO2008107224A2 (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

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP2135264A2 (fr) 2009-12-23
DE102007011050A1 (de) 2008-09-11
EP2135264B1 (fr) 2013-03-13
WO2008107224A3 (fr) 2008-11-20

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