WO1996041947A1 - Procede d'ajustage d'un entrefer d'un electro-aimant - Google Patents

Procede d'ajustage d'un entrefer d'un electro-aimant Download PDF

Info

Publication number
WO1996041947A1
WO1996041947A1 PCT/US1996/008228 US9608228W WO9641947A1 WO 1996041947 A1 WO1996041947 A1 WO 1996041947A1 US 9608228 W US9608228 W US 9608228W WO 9641947 A1 WO9641947 A1 WO 9641947A1
Authority
WO
WIPO (PCT)
Prior art keywords
armature
stator
air gap
poles
assembly
Prior art date
Application number
PCT/US1996/008228
Other languages
English (en)
Inventor
John S. Bright
Original Assignee
Siemens Automotive Corporation
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 Siemens Automotive Corporation filed Critical Siemens Automotive Corporation
Publication of WO1996041947A1 publication Critical patent/WO1996041947A1/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
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • 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
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • 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
    • H01F2007/085—Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material

Definitions

  • This invention relates to solenoid devices including an air gap and, in a particular embodiment, to a valve actuating solenoid in an engine fuel injector.
  • the solenoid may have an actuating coil surrounded on its inner, outer, and upper sides, for example, by a stator of magnetic material and having inner and outer annular poles extending to an open end.
  • a moveable armature is provided that is connected with an injector valve needle or other moveable element.
  • the armature has inner and outer poles, one of which, preferably the inner one, is engageable with the inner pole of the stator when the solenoid coil is energized.
  • the outer pole of the armature lies opposite a lower face of a flux washer which is mounted with its outer edge in engagement with the outer pole of the stator.
  • the stator, armature and flux washer are all made from magnetic material to concentrate the magnetic field developed by the coil.
  • the armature When the coil is energized, the armature is moved into engagement with the inner pole of the stator, leaving a preselected air gap between the outer pole of the armature and the opposed face of the flux washer.
  • the desired spacing of the air gap is obtained by selection of a washer of the proper thickness from a group of washers of various thicknesses made in advance and stored at the assembly location for use as needed.
  • This method requires some sorting of parts at the time of assembly and the keeping of an inventory of different sized washer elements within the tolerance range, Inevitably, some of the parts will be unusable due to tolerance stack-ups in manufacture and the gap may not be controlled to the desired tolerance.
  • the present invention provides a method for sizing the air gap at assembly without requiring an inventory of presized flux washers or other components and without requiring selection or sorting of these parts at the assembly station.
  • the method involves the steps of: determining the gap defining dimensions of all but one of the elements; determining the dimensions required for said one element to form the desired air gap upon assembly with the others of said elements; and sizing said one element to the required dimensions (the latter step was previously done by selection); characterized in that sizing of the one element to the required dimensions is carried out by deformation of a preform.
  • the preform which is sized is a flux washer preform which has been previously fabricated by machining, cold forming, powered metal processing, metal injection molding or any other suitable process. It may be plated with a suitable malleable coating for corrosion or magnetic reasons.
  • Sizing of the flux washer preform at assembly is preferably accomplished by crushing or squeezing the washer, or at least the gap forming portion thereof, to the required dimension determined for the particular solenoid assembly by the previous method steps. Such sizing by crushing is easily accomplished by a press located at the assembly site. The properly sized flux washer is then installed in the assembly to form the desired air gap in the specific injector assembly for which it has been sized. If necessary, magnetic degradation of the deformed flux washer component can be removed by induction annealing prior to assembly.
  • the air gap may be determined by crushing one of the pole faces of either the armature or the stator.
  • the air gap of the assembled unit may be obtained by bending the web portion of the stator located between the inner and outer cylindrical poles. The web of the armature could alternatively be bent for this purpose.
  • FIG. 1 is a cross-sectional view of an exemplary form of engine fuel injector having a valve actuating solenoid formed in accordance with the invention
  • FIG. 2 is an enlarged cross-sectional view showing one form of flux washer used with the solenoid of FIG. 1 ;
  • FIG. 3 is a view similar to FIG. 2 but showing an alternative embodiment of flux washer
  • FIG. 4 is a view similar to FIGS. 2-3 but showing another embodiment of flux washer.
  • numeral 10 generally indicates an engine fuel injector having a body 1 2 carrying an injection nozzle 14 controlled by a reciprocable valve needle 1 6.
  • the valve needle is urged in a closing direction by a spring 1 8 and is actuated open by the force of a solenoid generally indicated by numeral 20.
  • Solenoid 20 includes a coil 22, stator 24, armature 26 and flux washer 28.
  • the stator, armature and flux washer are all made of magnetic material for concentrating the magnetic force generated by the coil 22.
  • the coil 22 is formed as a cylindrically wound electric coil enclosed in a cylindrical casing.
  • the stator includes a web 30 extending across the upper end of the coil and connecting with a cylindrical inner pole 32 and a cylindrical outer pole 34 that extend from the web along inner and outer sides of the coil to spaced lower ends.
  • the armature 26 is fixed to the valve needle 1 6 and reciprocable therewith.
  • the armature 26 includes an inner pole 36 having an annular face that is engageable with the lower end of the inner pole 32 of the stator. Pole 36 is connected by a short web 37 with an outer pole 38 having an annular face spaced outwardly and downwardly from that of the inner pole.
  • the flux washer 28 is secured within the body 1 2 and has an upwardly facing outer surface
  • Washer 28 also has a downwardly facing inner face 42 which is located in opposed relation to the annular end of the outer pole 38 of the armature.
  • FIGS. 2, 3 and 4 illustrate three differing forms of flux washers which could be used in a solenoid according to the invention.
  • the flux washer 28 is shown as having a flat lower wall 46 and a parallel upper wall 48 with a raised outer rim 50 having an upper face 40 engageable with the annular end of outer pole 34 of the stator.
  • the inner portion of the lower wall 46 defines the inner face 42 of the flux washer and the air gap 44 is shown between face 42 and the annular face of the armature outer pole 38.
  • FIG. 3 shows an alternative embodiment of flux washer 52 wherein like numerals are used for like features. Washer 52 differs in its provision of an inner rim 54 on the inner edge of the upper wall 48 for a purpose to be subsequently described.
  • FIG. 4 another embodiment of flux washer 56 is illustrated in which both rims of the previous designs are omitted and the lower and upper walls 46, 48 are both flat.
  • the outer portion of upper wall 48 defines the outer face, while the inner portion of lower wall 46 defines the inner face 42.
  • the invention provides a novel process including the following steps for use in the manufacturing process:
  • the elevations of the inner poles may be summed, the elevations of the outer poles added together and the difference between the elevations of the inner and outer poles determined by substraction. This difference is adjusted by adding or subtracting the desired air gap for the finished assembly and the resulting dimension represents the overall thickness of the flux washer which will provide the desired air gap.
  • a preformed flux washer member is sized to the desired thickness by deformation.
  • the outer rim 50 of flux washer 28 may be crushed until the thickness dimension between the outer face 40 and the inner face 42 of lower wall 46 is equal to the desired dimension.
  • This deforming step may easily be accomplished by placing the deformable flux washer in a press which may be controllably actuated to crush the flux washer to the desired thickness dimension. While crushing of the flux washer element is a preferred manner of carrying out the process according to the invention, it is within the scope of the invention to alternatively deform other portions or elements of the magnetic assembly represented by the stator 24, armature 26 and flux washer 28.
  • the outer or inner ends of the poles of either the armature or tr e stator could be crushed or squeezed to alter their elevational dimensions and thereby obtain the desired air gap 44.
  • the web 30 of the stator or the corresponding web of the armature could be bent a small amount in order to alter the relative elevations of the inner and outer poles of the stator or armature in order to obtain the desired air gap.
  • the corresponding web of the armature could be bent.
  • the addition of the inner rim 54 to the flux washer 52 may be advantageous in helping to avoid bowing of the flux washer during sizing by crushing.
  • the flat flux washer 56 of FIG. 4 is proposed for use when the dimensions of the flux washer are not altered but the sizing of the air gap is accomplished by plastic deformation of either the armature or the stator, either by crushing the poles or bending the web as previously mentioned.

Landscapes

  • 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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention porte sur un entrefer (44) dans un dispositif à électro-aimant, un injecteur de carburant de moteur par exemple, que l'on ajuste en cours d'assemblage en déterminant l'interstice définissant les dimensions de tous les éléments magnétiques de l'électro-aimant, à l'exception de l'un d'eux, puis en déterminant les dimensions de l'élément nécessaire à la constitution de l'entrefer désiré lors de son montage avec les autres éléments et en le dimensionnant aux cotes souhaitées par déformation d'une ébauche. Dans un mode de réalisation préféré, on forme une rondelle d'étanchéité de flux (28), destinée à entrer en contact avec un pôle d'un stator (24) et à séparer d'un autre pôle (38) d'une armature (26) par un entrefer (44), avant de la monter à une épaisseur prédéfinie, conçue pour ménager l'entrefer désiré, lors du montage avec des éléments mesurés au préalable dans un assemblage. Le dimensionnement de la rondelle d'étanchéité de flux ou d'un autre élément magnétique par déformation plastique comme le formage évite de trier un jeu de rondelles de tailles diverses stockées sur le lieu de montage et d'en sélectionner une, réduisant, de ce fait, à leur minimum le temps d'assemblage et les coûts.
PCT/US1996/008228 1995-06-08 1996-05-31 Procede d'ajustage d'un entrefer d'un electro-aimant WO1996041947A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US48847295A 1995-06-08 1995-06-08
US08/488,472 1995-06-08

Publications (1)

Publication Number Publication Date
WO1996041947A1 true WO1996041947A1 (fr) 1996-12-27

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1103718A2 (fr) * 1999-11-23 2001-05-30 Siemens Aktiengesellschaft Réglage de la course entre un actionneur et un élément de transmission pour une soupape dans un injecteur de combustible
WO2000068563A3 (fr) * 1999-05-07 2001-07-19 Siemens Ag Procede pour positionner l'entrainement de reglage dans un injecteur de carburant, et dispositif pour la mise en oeuvre de ce procede
GB2378985A (en) * 2001-07-09 2003-02-26 Bosch Gmbh Robert Adjusting the magnet stroke in fuel injection solenoid valves
GB2388165A (en) * 2002-03-19 2003-11-05 Visteon Global Tech Inc Fuel injector with flux washer
WO2004070196A1 (fr) * 2003-02-04 2004-08-19 Siemens Aktiengesellschaft Procede pour determiner une position d'un element dans un alesage etage d'un carter et injecteur pour l'injection de carburant
US6971172B2 (en) * 2003-08-08 2005-12-06 Cummins Inc. Piezoelectric control valve adjustment method
EP1845256A1 (fr) * 2006-04-11 2007-10-17 C.R.F. Societa' Consortile per Azioni Injecteur de carburant pour moteur à combustion interne avec servo soupape réglable de dosage
EP1826394A3 (fr) * 2006-02-27 2009-04-08 Denso Corporation Actionneur électromagnétique à réponse rapide
EP2112366A1 (fr) * 2008-04-23 2009-10-28 MAGNETI MARELLI POWERTRAIN S.p.A. Injecteur de carburant électromagnétique pour carburants gazeux avec dispositif d'arrêt anti-usure
JP2016125518A (ja) * 2014-12-26 2016-07-11 株式会社デンソー 電磁バルブ製造方法
GB2576559A (en) * 2018-08-24 2020-02-26 Delphi Automotive Systems Lux Solenoid activated fuel injector with flux washer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2058466A (en) * 1979-09-08 1981-04-08 Bosch Gmbh Robert Electromagnetic fuel injection valve
US4475690A (en) * 1981-10-06 1984-10-09 Robert Bosch Gmbh Magnetic valve, in particular a fuel injection valve
US4610080A (en) * 1985-07-29 1986-09-09 Allied Corporation Method for controlling fuel injector lift
EP0215527A1 (fr) * 1985-09-19 1987-03-25 WEBER S.r.l. Electro-injecteur d'alimentation de combustible pour moteurs à combustion interne et son procédé de fabrication
EP0216943A1 (fr) * 1985-08-06 1987-04-08 Ibm Deutschland Gmbh Dispositif d'actionnement électromagnétique notamment de marteaux d'impression
US5417373A (en) * 1994-02-10 1995-05-23 Siemens Automotive L.P. Electromagnet for valves

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2058466A (en) * 1979-09-08 1981-04-08 Bosch Gmbh Robert Electromagnetic fuel injection valve
US4475690A (en) * 1981-10-06 1984-10-09 Robert Bosch Gmbh Magnetic valve, in particular a fuel injection valve
US4610080A (en) * 1985-07-29 1986-09-09 Allied Corporation Method for controlling fuel injector lift
EP0216943A1 (fr) * 1985-08-06 1987-04-08 Ibm Deutschland Gmbh Dispositif d'actionnement électromagnétique notamment de marteaux d'impression
EP0215527A1 (fr) * 1985-09-19 1987-03-25 WEBER S.r.l. Electro-injecteur d'alimentation de combustible pour moteurs à combustion interne et son procédé de fabrication
US5417373A (en) * 1994-02-10 1995-05-23 Siemens Automotive L.P. Electromagnet for valves

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000068563A3 (fr) * 1999-05-07 2001-07-19 Siemens Ag Procede pour positionner l'entrainement de reglage dans un injecteur de carburant, et dispositif pour la mise en oeuvre de ce procede
EP1103718A2 (fr) * 1999-11-23 2001-05-30 Siemens Aktiengesellschaft Réglage de la course entre un actionneur et un élément de transmission pour une soupape dans un injecteur de combustible
EP1103718A3 (fr) * 1999-11-23 2003-04-02 Siemens Aktiengesellschaft Réglage de la course entre un actionneur et un élément de transmission pour une soupape dans un injecteur de combustible
DE19956256B4 (de) * 1999-11-23 2004-04-08 Siemens Ag Leerhubeinstellung zwischen einem Aktor und einem Übertragungselement eines Ventils in einem Kraftstoffinjektor
GB2378985A (en) * 2001-07-09 2003-02-26 Bosch Gmbh Robert Adjusting the magnet stroke in fuel injection solenoid valves
GB2378985B (en) * 2001-07-09 2003-12-31 Bosch Gmbh Robert Method and arrangement for adjusting the magnet stroke in fuel injectors
GB2388165A (en) * 2002-03-19 2003-11-05 Visteon Global Tech Inc Fuel injector with flux washer
US7543382B2 (en) 2003-02-04 2009-06-09 Continental Automotive Gmbh Method for determining the position of a component in a stepped bore of a housing, and an injector for fuel injection
EP1965072A1 (fr) * 2003-02-04 2008-09-03 Continental Automotive GmbH Injecteur pour l'injection de carburant
WO2004070196A1 (fr) * 2003-02-04 2004-08-19 Siemens Aktiengesellschaft Procede pour determiner une position d'un element dans un alesage etage d'un carter et injecteur pour l'injection de carburant
US6971172B2 (en) * 2003-08-08 2005-12-06 Cummins Inc. Piezoelectric control valve adjustment method
EP1826394A3 (fr) * 2006-02-27 2009-04-08 Denso Corporation Actionneur électromagnétique à réponse rapide
EP1845256A1 (fr) * 2006-04-11 2007-10-17 C.R.F. Societa' Consortile per Azioni Injecteur de carburant pour moteur à combustion interne avec servo soupape réglable de dosage
US7552909B2 (en) 2006-04-11 2009-06-30 C.R.F. Societa Consortile Per Azioni Fuel injector with adjustable-metering servo valve for an internal-combustion engine
EP2112366A1 (fr) * 2008-04-23 2009-10-28 MAGNETI MARELLI POWERTRAIN S.p.A. Injecteur de carburant électromagnétique pour carburants gazeux avec dispositif d'arrêt anti-usure
US8245956B2 (en) 2008-04-23 2012-08-21 Magneti Marelli Electromagnetic fuel injector for gaseous fuels with anti-wear stop device
JP2016125518A (ja) * 2014-12-26 2016-07-11 株式会社デンソー 電磁バルブ製造方法
GB2576559A (en) * 2018-08-24 2020-02-26 Delphi Automotive Systems Lux Solenoid activated fuel injector with flux washer

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