WO1991006109A1 - Electro-aimant - Google Patents

Electro-aimant Download PDF

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Publication number
WO1991006109A1
WO1991006109A1 PCT/DE1990/000703 DE9000703W WO9106109A1 WO 1991006109 A1 WO1991006109 A1 WO 1991006109A1 DE 9000703 W DE9000703 W DE 9000703W WO 9106109 A1 WO9106109 A1 WO 9106109A1
Authority
WO
WIPO (PCT)
Prior art keywords
pot
magnet
electromagnet
armature
radial slots
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.)
Ceased
Application number
PCT/DE1990/000703
Other languages
German (de)
English (en)
Inventor
Nestor Rodriguez-Amaya
Friedrich Weiss
Alfred Schmitt
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 WO1991006109A1 publication Critical patent/WO1991006109A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • 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
    • H01F2007/1676—Means for avoiding or reducing eddy currents in the magnetic circuit, e.g. radial slots

Definitions

  • the invention is based on an electromagnet, in particular for use in switching valves for direct control of the fuel injection quantity
  • Fuel injection pumps the type defined in the preamble of claim 1.
  • the quantity of fuel metered per pump piston stroke is usually divided into a pre-injection quantity and a main injection quantity, which can vary greatly in terms of time and mass depending on the load and speed of the internal combustion engine.
  • An electromagnetic switching valve with extremely short is important for the highly precise metering and thus for the formation of stable operating states of the internal combustion engine Switching times, which responds by applying a control pulse with an extremely low delay. Short switching times of the electromagnet are achieved by laminating the magnetic circuit, since this reduces the formation of eddy currents in the soft iron and the magnetic flux in the magnetic circuit is built up and broken down much faster.
  • cup-shaped electromagnets are used because of the limited installation space. The sheet must therefore be made in the radial direction.
  • the necessary lamination in the radial direction is achieved in that the magnet pot and, if appropriate, the magnet armature consist of a ring of soft iron sheet folded in the circumferential direction (see there FIGS. 1-3). will be produced. After folding, the ring is tapped on the outside, so that the outer connections of the individual folding strips are separated, and held together with an outer cover. Because of the outwardly increasing diameter of the folded ring, the individual folding strips are designed with different radial lengths. Such a manufacturing process is very complex and accordingly expensive.
  • the electromagnet according to the invention with the characterizing features of claim 1 has the advantage that the magnetic circuit of the electromagnet can be manufactured inexpensively in solid construction and then provided with the slots according to the invention. This is cost-saving, since all of the labor-intensive work required for a laminated magnetic pot or magnet armature
  • FIG. 1 shows a longitudinal section of an electromagnetic switching valve for a fuel injection pump
  • Fig. 2 each a plan view of a magnetic pot in up to 4 electromagnets of the switching valve in Fig. 1 according to three embodiments. Description of the embodiments
  • DE-OS 35 23 536 defines fuel injection is known and described in DE-OS 35 23 536 in its structure and its operation in connection with a fuel injection pump designed as a pump nozzle. It has a valve body 11 which has a valve chamber 12 and an axial guide 13 for
  • valve needle 14 cooperates with a valve seat 15 which surrounds a valve opening 16.
  • the valve opening 16 divides the valve chamber 12 into a high-pressure and a low-pressure section, each at a high-pressure bore
  • Bores 17, 18 open into the end face of the valve body 11 designed as a sealing surface.
  • valve body 11 and the housing connector are connected by means of a union nut 19.
  • a valve cover 21 is placed on the valve body 11 and is attached to the valve body by means of a sleeve 22
  • valve body 11 is screwed.
  • Valve cover 21 an electromagnet 20 is clamped for actuating the valve needle 14, which in the de-energized electromagnet 20 under the action of a valve opening spring 23 on a stroke stop 24 in
  • the electromagnet 20 has a magnetic pot 25 made of soft magnetic material inserted ring-shaped excitation coil 30, an annular yoke 26 covering the end face of the magnetic pot 25 and one opposite the magnetic pot 25 while leaving an inner air gap 27 and the return yoke 26 while leaving an outer air gap 28, in
  • the magnet pot 25 has an outer hollow cylindrical pot wall 31, an inner, coaxial hollow cylindrical pot core 32 and a pot wall 31 and pot core 32 integrally connecting the pot bottom 33.
  • the hollow cylindrical pot core 32 is seated on a nozzle 34 on the valve body 11.
  • the excitation coil 30 which is wound on a bobbin 36 made of insulating material and the two winding ends of which are each connected to a connection contact 37, 38 which acts as a connector 39, 40 on the top of the Project valve cover 21 axially.
  • the magnetic pot 25 made of solid, soft magnetic material has eight radial slots 41 which penetrate the magnetic pot 25 in its full axial length, two groups of differently designed radial slots 41a and 41b being present. Both groups of radial slots 41a and 41b are nested one inside the other, so that a radial slot of group 41b follows a radial slot of group 41a in the circumferential direction.
  • the radial slots of group 41a extend from the outer lateral surface 311 of the outer pot wall 31, extend close to the inner lateral surface 321 of the pot core 32 and end there while leaving a material web 42.
  • the radial slots of group 41b extend from the inner lateral surface 321 , extend to close to the outer lateral surface 311 and end there while leaving a web of material 43. Successive radial slots 41 are offset from one another by the same circumferential angle, here by 45 °.
  • This arrangement of the radial slots 41 enforces a meandering course of the eddy currents, as indicated by dash-dotted lines in FIG. 2 and indicated by arrows. Due to this forced course of the eddy currents, the eddy current resistance of the magnetic pot 25 is significantly increased, thus the build-up and breakdown of the magnetic flux in the magnetic circuit is considerably accelerated, so that the electromagnet 20 has extremely short switching times.
  • the magnetic pot 25 shown in plan view in FIG. 3 has a total of twelve radial slots 41, which are distributed uniformly over the circumference of the magnetic pot 25 in the two groups of differently designed radial slots 41a, 41b.
  • the radial slots 41a and 41b are formed as in FIG. 2.
  • both the number and the length of the radial slots 41 - or the width of the remaining material webs 42, 43 - can be varied.
  • the number of radial slots 41 is always an even number, but at least four. 4 shows a magnetic pot 25 which has a total of six radial slots 41, the radial slots 41a of one group only reaching as far as the pot core 32 and the radial slots 41b of the other group only reaching as far as the pot wall 31.
  • the remaining material webs 42, 43 are therefore essential 2 and correspond to the radial width of the pot core 32 or pot wall 31.
  • the dynamic behavior of an electromagnet 20 equipped with this magnet pot 25 is significantly worse than that of an electromagnet 20 with a
  • the invention is not restricted to the exemplary embodiments described. To further improve the dynamic behavior, it is advantageous to also slit the magnet armature .29 and the yoke 26 in the same manner as described for the magnet pot 25. However, it is not necessary to provide the same number of slots in magnet armature 29 and / or yoke 26 as in magnet pot 25. The slots open out in the same way as described for the magnetic pot 25 alternately in the inner and outer lateral surface of the magnet armature 29 or yoke 26, while a material web remains on the respective other lateral surface.

Landscapes

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

Abstract

Un électro-aimant, en particulier pour l'utilisation dans des soupapes de commande pour la commande directe d'une quantité d'injection de carburant dans le cas de pompes d'injection de carburant, présente un aimant en pot (25) en matériau magnétique doux, une bobine d'excitation annulaire (30) et un noyau d'aimant (29) situé, avec un entrefer de travail, devant l'aimant en pot (25). En vue de l'amélioration du comportement dynamique de l'électro-aimant (20), c'est-à-dire en vue de l'obtention de temps de commutation extrêmement courts, le circuit magnétique étant d'une conception très simple du point de vue de la technique de fabrication, l'aimant en pot (25) et/ou noyau d'aimant (29), fabriqué comme partie massive, est muni d'un nombre pair d'au moins quatre fentes radiales (41) qui partagent l'aimant en pot (25) ou noyau d'aimant (29) dans toute sa longueur axiale. Des fentes radiales successives (41a, 41b) s'étendent alternativement depuis l'enveloppe extérieure ou intérieure (311 ou 321) jusqu'à proximité de l'enveloppe intérieure ou extérieure (321 ou 311) et s'y terminent chaque fois en laissant un pont de matériau (42 ou 43).
PCT/DE1990/000703 1989-10-10 1990-09-13 Electro-aimant Ceased WO1991006109A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3933758.8 1989-10-10
DE19893933758 DE3933758A1 (de) 1989-10-10 1989-10-10 Elektromagnet

Publications (1)

Publication Number Publication Date
WO1991006109A1 true WO1991006109A1 (fr) 1991-05-02

Family

ID=6391158

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1990/000703 Ceased WO1991006109A1 (fr) 1989-10-10 1990-09-13 Electro-aimant

Country Status (2)

Country Link
DE (1) DE3933758A1 (fr)
WO (1) WO1991006109A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0570649A1 (fr) * 1992-05-19 1993-11-24 New Sulzer Diesel Ag Dispositif de commande de l'alimentation en fluide hydraulique, notamment pour l'injection du carburant d'un moteur à combustion interne
WO1993024750A1 (fr) * 1992-06-03 1993-12-09 Siemens Automotive Corporation Clapet d'injecteur commande par solenoide
WO1998013837A1 (fr) * 1996-09-24 1998-04-02 Robert Bosch Gmbh Soupape d'injection de carburant
WO2000074086A1 (fr) * 1999-05-29 2000-12-07 Daimlerchrysler Ag Actionneur pour la commande de soupape par voie electromagnetique
EP1059646A1 (fr) * 1999-05-29 2000-12-13 DaimlerChrysler AG Actionneur pour commande électromagnétique de soupape
FR2916103A1 (fr) * 2007-05-11 2008-11-14 Cnes Epic Actionneur electromagnetique a reluctance variable
GB2455403B (en) * 2007-12-04 2012-12-26 Caterpillar Inc Solenoid assembly having slotted stator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6168135B1 (en) 1998-05-15 2001-01-02 Siemens Automotive Corporation Slotted housing for fuel injector
DE102012209229A1 (de) * 2012-05-31 2013-12-05 Robert Bosch Gmbh Kraftstoffinjektor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55108712A (en) * 1979-02-13 1980-08-21 Nissin Electric Co Ltd Dc electromagnet
GB2201039A (en) * 1987-02-13 1988-08-17 Bosch Gmbh Robert A solenoid valve for a fuel injection pump of an internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55108712A (en) * 1979-02-13 1980-08-21 Nissin Electric Co Ltd Dc electromagnet
GB2201039A (en) * 1987-02-13 1988-08-17 Bosch Gmbh Robert A solenoid valve for a fuel injection pump of an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 4, no. 157 (E-32)(639) 04 November 1980, & JP-A-55 108712 (NITSUSHIN DENKI K.K.) siehe das ganze Dokument *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0570649A1 (fr) * 1992-05-19 1993-11-24 New Sulzer Diesel Ag Dispositif de commande de l'alimentation en fluide hydraulique, notamment pour l'injection du carburant d'un moteur à combustion interne
WO1993024750A1 (fr) * 1992-06-03 1993-12-09 Siemens Automotive Corporation Clapet d'injecteur commande par solenoide
WO1998013837A1 (fr) * 1996-09-24 1998-04-02 Robert Bosch Gmbh Soupape d'injection de carburant
WO2000074086A1 (fr) * 1999-05-29 2000-12-07 Daimlerchrysler Ag Actionneur pour la commande de soupape par voie electromagnetique
EP1059646A1 (fr) * 1999-05-29 2000-12-13 DaimlerChrysler AG Actionneur pour commande électromagnétique de soupape
US6322048B1 (en) 1999-05-29 2001-11-27 Daimlerchrysler Ag Actuator for electromagnetic valve control
FR2916103A1 (fr) * 2007-05-11 2008-11-14 Cnes Epic Actionneur electromagnetique a reluctance variable
WO2008152237A1 (fr) * 2007-05-11 2008-12-18 Centre National D'etudes Spatiales (C.N.E.S.) Actionneur électromagnétique à réluctance variable
US7978038B2 (en) 2007-05-11 2011-07-12 Centre National D'etudes Spatiales (C.N.E.S.) Electromagnetic actuator with variable reluctance
GB2455403B (en) * 2007-12-04 2012-12-26 Caterpillar Inc Solenoid assembly having slotted stator

Also Published As

Publication number Publication date
DE3933758A1 (de) 1991-04-18

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