WO2008012406A1 - Electromagnetic holding flange actuator of the core - Google Patents

Electromagnetic holding flange actuator of the core Download PDF

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Publication number
WO2008012406A1
WO2008012406A1 PCT/FR2007/001118 FR2007001118W WO2008012406A1 WO 2008012406 A1 WO2008012406 A1 WO 2008012406A1 FR 2007001118 W FR2007001118 W FR 2007001118W WO 2008012406 A1 WO2008012406 A1 WO 2008012406A1
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WO
WIPO (PCT)
Prior art keywords
core
actuator
rigid frame
actuator according
coil
Prior art date
Application number
PCT/FR2007/001118
Other languages
French (fr)
Inventor
Mahmoud Sfaxi
Original Assignee
Valeo Systemes De Controle Moteur
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 Valeo Systemes De Controle Moteur filed Critical Valeo Systemes De Controle Moteur
Publication of WO2008012406A1 publication Critical patent/WO2008012406A1/en

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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
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • H01F7/1646—Armatures or stationary parts of magnetic circuit having permanent magnet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric 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
    • H01F7/081—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
    • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H01F7/122—Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2132—Biasing means
    • F01L2009/2134—Helical springs
    • F01L2009/2136—Two opposed springs for intermediate resting position of the armature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2146—Latching means
    • F01L2009/2148—Latching means using permanent magnet

Definitions

  • the present invention relates to an electromagnetic actuator used in particular for moving valves of an internal combustion engine such as those used to move motor vehicles.
  • An electromagnetic actuator generally comprises an actuating member associated with a movable pallet under the action of at least one electromagnet.
  • the electromagnet comprises a housing in which are fixed a coil and a core arranged to channel a stream of the coil so that the flow of the coil is closed in the pallet.
  • the core is formed of a bundle of ferromagnetic sheets contiguous and cut in E so that the core comprises a base from which branches extend, including a central branch around which the coil extends. It is known to make the central branch in two parts, namely a foot portion integral with the base and an end portion resting on the foot portion via permanent magnets. Fixing the end portion of the central branch of the core is difficult because of the constitution of the core sheet package.
  • An object of the invention is to provide a solution for fixing at least a portion of the core to the housing.
  • an electromagnetic actuator comprising an actuating member associated with a pallet and a casing in which are fixed a coil and at least one core arranged for channeling a stream of the coil so that it closes in the pallet, the actuator comprising a flange for attaching at least a portion of the core to the housing, the flange having a rigid frame which has two opposed portions projecting from the core and which is held in a direction perpendicular to the pallet against said portion of the core by two legs each having an end fixed to the housing and an end fixed to one of the portions of the frame projecting from the core.
  • the tabs extend on each side of the core so that it is not necessary to pierce it.
  • the rigidity of the frame allows it to exert a uniform effort on the whole core.
  • the tabs preferably have a sufficiently small thickness to be received between the core and the coil.
  • the tabs are elastic so as to resiliently apply the rigid frame against said part of the core and, preferably, the tabs are dimensioned to exert a predetermined force for a theoretical minimum height of said part of the core, taking into account manufacturing tolerances. the actuator.
  • the elasticity of the tabs makes it possible in particular to prevent an accumulation of stresses which would result from a differential expansion of the elements constituting the actuator.
  • the elasticity of the tabs further allows the latter to make up the manufacturing sets so that the tabs allow a correct application of the frame on the core part regardless of the dimensional dispersions existing in a series of parts.
  • the core comprises a base from which branches extend, including a central branch around which the coil extends, the central branch comprising a foot portion secured to the base and an end portion against which is applied the rigid frame of the flange and optionally at least one permanent magnet is disposed between the foot part and the end part of the central branch of the core.
  • the flange thus ensures the attachment of the end portion of the central branch of the core and the permanent magnet by plating them against the foot portion of the central branch.
  • the central branch of the core is traversed by a guide stud comprising a bore slidably receiving the actuating member, the rigid frame extending around an end of the bore opening at the level of the terminal part of the central branch.
  • the fixing of the core is not affected by the presence of the guide pin so that the same flange can be used for the core located on the side of the actuating member and for the core lying on the side of the actuator. the pallet opposite to the actuating member.
  • the rigid frame is open.
  • the rigid frame behaves like a coil and interferes in the operation of one actuator.
  • FIG. 1 is a partial schematic view in longitudinal section of an actuator according to the invention
  • FIG. 2 is an elevational view with an exploded actuator according to a second embodiment
  • FIG. 3 is a partial view of the actuator of FIG.
  • the electromagnetic actuator of the invention comprises two electromagnets 2a, 2b arranged facing each other on either side. a pallet 3 integral with a pusher 4 movable along an axis X perpendicular to the pallet 3. Each electromagnet 2a, 2b exerts an electromagnetic force on the pallet 3 in a controlled manner.
  • Each electromagnet 2a_, 2b comprises a housing 5a, 5b in which are mounted a coil 6a., 6b and a core 7a, 7b.
  • Each core 7a., 7b is formed of a bundle of plates joined and cut into the shape of E.
  • Each core 7a., 7b thus comprises a base 8a, 8b from which extend two lateral branches 9a, 9b and a central branch 10a, 10b around which extends the coil 6a., 6b.
  • the central branch comprises a foot portion 11a, 11b provided with two portions having facing faces to form a V and supporting the permanent magnets 12a, 12b so that they extend obliquely with respect to the axis.
  • the central branch comprises an end portion 13a., 13b bearing against the magnets 12a, 12b.
  • the end portion 13a., 13b is held against the magnets 12a, 12b by a fastening flange comprising a rigid frame 14a., 14b which extends in the parallel grooves 17a, 17b formed on the free face of the end portion 13a. , 13b (the free face is opposite the pallet 3) and which has opposite portions 15a, 15b protruding from the core 7a, 7b (the portions of the frame 14a in overflow of the core 7a are not visible in the figures).
  • the rigid frame 14a, 14b is here formed of a circular section wire shaped rectangle, the ends of the wire being disjointed so that the rigid frame 14a., 14b is open.
  • the rigid frame 14a, 14b is applied against the end portion 13a, 13b by tabs 16b (the brackets of the frame 14a are not visible in the figures but are identical to the tabs 16b) extending between the core 7a, 7b and the coil 6a, 6b and each having an end connected to one of the overflow portions 15a, 15b and an opposite end fixed to the housing 5a, 5b. Fixing is done by screwing or riveting.
  • the tabs 16b are elastic and exert on the rigid frame 14a., 14b a force in the direction X applying the end portion 13a, 13b against the magnets 12a, 12b.
  • the tabs 16b are sized to exert a predetermined force for a theoretical minimum height of said portion 13a, 13b of the core 7a, 7b given production tolerances of one actuator. Note that the tabs here are slightly arched so that they are elastically deformable between an arcuate rest state and a substantially straight deformed state.
  • the central branch 10b of the core 7b is traversed by a guide stud 18 secured to the housing 5b and provided with a bore 19 slidably receiving the pusher 4.
  • Two parallel grooves 20 extend on either side of the bore 19 in the extension of the grooves 17b to receive the rigid frame 14b
  • the rigid frame 14b thus extends around the end of the bore 19 opening on the side of the free face of the end portion 13b.
  • Such an actuator 1 is for example used to actuate an internal combustion engine valve, one actuator being arranged so that the pusher 5 extends along the sliding axis of the valve.
  • the end of the pusher 5 and the end of the valve are recalled to each other by opposing springs defining an equilibrium position of the pusher-valve assembly in which the pallet extends substantially midway between the two electromagnets.
  • the fixing flange may be arranged to also retain the coil (part of the frame then also extends on the coil).
  • the mounting flange can also be used to secure the entire core to the housing.
  • brackets of the mounting flange may be welded to the housing or partially embedded therein.
  • the central branch of the core comprises a foot portion and an end portion between which are placed flat magnets. Fixing the end portion is performed by a fastening flange identical to that described above.
  • the central branch, or even the actuator, may not be equipped with permanent magnets.
  • the legs may not be elastic.

Abstract

Electromagnetic actuator (4) comprising an actuating component (4) associated with a relay armature (3) and a housing (5a, 5b) in which are secured a coil (6a, 6b) and at least one core (7a, 7b) arranged so as to channel a flow from the coil so that it is closed in the relay armature, the actuator comprising a flange for attaching at least one part (13a, 13b) of the core to the housing, the flange comprising a rigid frame (14a, 14b) that has two opposite portions (15a, 15b) projecting from the core and which is held, along a direction perpendicular to the relay armature, against said part of the core by two tabs each having one end attached to the housing and one end attached to one of the portions of the frame extending from the core.

Description

Actionneur électromagnétique à bride de maintien du noyau Electromagnetic actuator with a kernel holding flange
La présente invention concerne un actionneur électromagnétique utilisable notamment pour déplacer des soupapes d'un moteur thermique à combustion interne tel que ceux utilisés pour mouvoir les véhicules automobiles.The present invention relates to an electromagnetic actuator used in particular for moving valves of an internal combustion engine such as those used to move motor vehicles.
ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION
Un actionneur électromagnétique comprend généralement un organe d'actionnement associé à une palette mobile sous l'action d'au moins un électroaimant. L 'électroaimant comporte un boîtier dans lequel sont fixés une bobine et un noyau agencé pour canaliser un flux de la bobine pour que le flux de la bobine se referme dans la palette. Le noyau est formé d'un paquet de tôles ferromagnétiques accolées et découpées en E de manière que le noyau comporte une base de laquelle s'étendent des branches dont une branche centrale autour de laquelle s'étend la bobine. Il est connu de réaliser la branche centrale en deux parties, à savoir une partie de pied solidaire de la base et une partie terminale reposant sur la partie de pied par l'intermédiaire d'aimants permanents. La fixation de la partie terminale de la branche centrale du noyau s ' avère difficile du fait de la constitution du noyau en paquet de tôles .An electromagnetic actuator generally comprises an actuating member associated with a movable pallet under the action of at least one electromagnet. The electromagnet comprises a housing in which are fixed a coil and a core arranged to channel a stream of the coil so that the flow of the coil is closed in the pallet. The core is formed of a bundle of ferromagnetic sheets contiguous and cut in E so that the core comprises a base from which branches extend, including a central branch around which the coil extends. It is known to make the central branch in two parts, namely a foot portion integral with the base and an end portion resting on the foot portion via permanent magnets. Fixing the end portion of the central branch of the core is difficult because of the constitution of the core sheet package.
OBJET DE L'INVENTIONOBJECT OF THE INVENTION
Un but de 1 ' invention est de proposer une solution pour la fixation d'au moins une partie du noyau au boîtier.An object of the invention is to provide a solution for fixing at least a portion of the core to the housing.
RESUME DE L ' INVENTIONSUMMARY OF THE INVENTION
A cet effet, on prévoit, selon l'invention, un actionneur électromagnétique comportant un organe d'actionnement associé à une palette et un boîtier dans lequel sont fixés une bobine et au moins un noyau agencé pour canaliser un flux de la bobine pour qu'il se referme dans la palette, l'actionneur comprenant une bride de fixation d'au moins une partie du noyau au boîtier, la bride comportant un cadre rigide qui possède deux portions opposées débordant du noyau et qui est maintenu appliqué selon une direction perpendiculaire à la palette contre ladite partie du noyau par deux pattes ayant chacune une extrémité fixée au boîtier et une extrémité fixée à une des portions du cadre débordant du noyau.For this purpose, according to the invention, an electromagnetic actuator is provided comprising an actuating member associated with a pallet and a casing in which are fixed a coil and at least one core arranged for channeling a stream of the coil so that it closes in the pallet, the actuator comprising a flange for attaching at least a portion of the core to the housing, the flange having a rigid frame which has two opposed portions projecting from the core and which is held in a direction perpendicular to the pallet against said portion of the core by two legs each having an end fixed to the housing and an end fixed to one of the portions of the frame projecting from the core.
Ainsi, les pattes s'étendent de chaque côté du noyau de sorte qu'il n'est pas nécessaire de percer celui-ci. En outre, la rigidité du cadre lui permet d'exercer un effort uniforme sur tout le noyau. Les pattes ont de préférence une épaisseur suffisamment faible pour pouvoir être reçues entre le noyau et la bobine.Thus, the tabs extend on each side of the core so that it is not necessary to pierce it. In addition, the rigidity of the frame allows it to exert a uniform effort on the whole core. The tabs preferably have a sufficiently small thickness to be received between the core and the coil.
Avantageusement, les pattes sont élastiques de manière à appliquer élastiquement le cadre rigide contre ladite partie du noyau et, de préférence, les pattes sont dimensionnées pour exercer un effort prédéterminé pour une hauteur minimale théorique de ladite partie du noyau compte tenu de tolérances de fabrication de l'actionneur.Advantageously, the tabs are elastic so as to resiliently apply the rigid frame against said part of the core and, preferably, the tabs are dimensioned to exert a predetermined force for a theoretical minimum height of said part of the core, taking into account manufacturing tolerances. the actuator.
L'élasticité des pattes permet notamment d'empêcher une accumulation de contraintes qui résulteraient d'une dilatation différentielle des éléments constituant l'actionneur. L'élasticité des pattes permet en outre à celles-ci de rattraper les jeux de fabrication de sorte que les pattes permettent une application correcte du cadre sur la partie de noyau quelles que soient les dispersions dimensionnelles existant dans une série de pièces.The elasticity of the tabs makes it possible in particular to prevent an accumulation of stresses which would result from a differential expansion of the elements constituting the actuator. The elasticity of the tabs further allows the latter to make up the manufacturing sets so that the tabs allow a correct application of the frame on the core part regardless of the dimensional dispersions existing in a series of parts.
Selon un mode de réalisation particulier, le noyau comprend une base de laquelle s'étendent des branches dont une branche centrale autour de laquelle s'étend la bobine, la branche centrale comportant une partie de pied solidaire de la base et une partie terminale contre laquelle est appliqué le cadre rigide de la bride et, éventuellement, au moins un aimant permanent est disposé entre la partie de pied et la partie terminale de la branche centrale du noyau.According to a particular embodiment, the core comprises a base from which branches extend, including a central branch around which the coil extends, the central branch comprising a foot portion secured to the base and an end portion against which is applied the rigid frame of the flange and optionally at least one permanent magnet is disposed between the foot part and the end part of the central branch of the core.
La bride assure ainsi la fixation de la partie terminale de la branche centrale du noyau et de l'aimant permanent en plaquant ceux-ci contre la partie de pied de la branche centrale.The flange thus ensures the attachment of the end portion of the central branch of the core and the permanent magnet by plating them against the foot portion of the central branch.
Selon une caractéristique particulière, la branche centrale du noyau est traversée par un plot de guidage comportant un alésage recevant à coulissement l'organe d ' actionnement , le cadre rigide s 'étendant autour d'une extrémité de l'alésage débouchant au niveau de la partie terminale de la branche centrale.According to a particular characteristic, the central branch of the core is traversed by a guide stud comprising a bore slidably receiving the actuating member, the rigid frame extending around an end of the bore opening at the level of the terminal part of the central branch.
Ainsi, la fixation du noyau n'est pas affectée par la présence du plot de guidage de sorte que la même bride peut être utilisée pour le noyau se trouvant du côté de l'organe d' actionnement et pour le noyau se trouvant du côté de la palette opposée à l'organe d' actionnement .Thus, the fixing of the core is not affected by the presence of the guide pin so that the same flange can be used for the core located on the side of the actuating member and for the core lying on the side of the actuator. the pallet opposite to the actuating member.
Avantageusement, le cadre rigide est ouvert.Advantageously, the rigid frame is open.
Ainsi, on évite que le cadre rigide se comporte comme une bobine et n'interfère dans le fonctionnement de 1 'actionneur.Thus, it is avoided that the rigid frame behaves like a coil and interferes in the operation of one actuator.
D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit d'un mode de réalisation particulier non limitatif de l'invention.Other features and advantages of the invention will become apparent on reading the following description of a particular non-limiting embodiment of the invention.
BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS
II sera fait référence aux dessins annexés, parmi lesquels :Reference will be made to the appended drawings, among which:
- la figure 1 est une vue schématique partielle en coupe longitudinale d'un actionneur conforme à l'invention ;- Figure 1 is a partial schematic view in longitudinal section of an actuator according to the invention;
- la figure 2 est une vue en élévation avec écor- ché d'un actionneur conforme à un deuxième mode de réalisation ; - la figure 3 est une vue partielle de l'action- neur de la figure 1.Figure 2 is an elevational view with an exploded actuator according to a second embodiment; FIG. 3 is a partial view of the actuator of FIG.
DESCRIPTION DETAILLEE DE L'INVENTION En référence à la figure 1, l'actionneur électromagnétique de l'invention, généralement désigné en 1, comporte deux électroaimants 2a, 2b, disposés en regard l'un de l'autre de part et d'autre d'une palette 3 solidaire d'un poussoir 4 mobile selon un axe X perpendiculaire à la palette 3. Chaque électroaimant 2a, 2b exerce de façon commandée un effort électromagnétique sur la palette 3.DETAILED DESCRIPTION OF THE INVENTION With reference to FIG. 1, the electromagnetic actuator of the invention, generally designated at 1, comprises two electromagnets 2a, 2b arranged facing each other on either side. a pallet 3 integral with a pusher 4 movable along an axis X perpendicular to the pallet 3. Each electromagnet 2a, 2b exerts an electromagnetic force on the pallet 3 in a controlled manner.
Chaque électroaimant 2a_, 2b comporte un boîtier 5a, 5b dans lequel sont montés une bobine 6a., 6b et un noyau 7a, 7b. Chaque noyau 7a., 7b est formé d'un paquet de tôles accolées et découpées en forme de E . Chaque noyau 7a., 7b comporte ainsi une base 8a, 8b de laquelle s'étendent deux branches latérales 9a., 9b et une branche centrale 10a., 10b autour de laquelle s'étend la bobine 6a., 6b. La branche centrale comporte une partie de pied lia., 11b pourvue de deux portions ayant des faces inclinées en regard pour former un V et supportant les aimants 12a_, 12b permanents de sorte que ceux-ci s'étendent obliquement par rapport à l'axe X. La branche centrale comprend une partie terminale 13a., 13b en appui contre les aimants 12a, 12b.Each electromagnet 2a_, 2b comprises a housing 5a, 5b in which are mounted a coil 6a., 6b and a core 7a, 7b. Each core 7a., 7b is formed of a bundle of plates joined and cut into the shape of E. Each core 7a., 7b thus comprises a base 8a, 8b from which extend two lateral branches 9a, 9b and a central branch 10a, 10b around which extends the coil 6a., 6b. The central branch comprises a foot portion 11a, 11b provided with two portions having facing faces to form a V and supporting the permanent magnets 12a, 12b so that they extend obliquely with respect to the axis. X. The central branch comprises an end portion 13a., 13b bearing against the magnets 12a, 12b.
La partie terminale 13a., 13b est maintenue appliquée contre les aimants 12a, 12b par une bride de fixation comprenant un cadre rigide 14a., 14b qui s'étend dans les rainures parallèles 17a, 17b ménagées sur la face libre de la partie terminale 13a, 13b (la face libre est en regard de la palette 3) et qui a des portions 15a, 15b opposées débordant du noyau 7a, 7b (les portions du cadre 14a en débordement du noyau 7a ne sont pas visibles sur les figures) . Le cadre rigide 14a, 14b est ici formé d'un fil de section circulaire conformé en rectangle, les extrémités du fil étant disjointes de manière que le cadre rigide 14a., 14b soit ouvert. Le cadre rigide 14a., 14b est appliqué contre la partie terminale 13a., 13b par des pattes 16b (les pattes de fixation du cadre 14a. ne sont pas visibles sur les figures mais sont identiques aux pattes 16b) s ' étendant entre le noyau 7a., 7b et la bobine 6a_, 6b et ayant chacune une extrémité reliée à une des portions 15a., 15b en débordement et une extrémité opposée fixée au boîtier 5a, 5b. La fixation est réalisée par vissage ou rivetage. Les pattes 16b sont élastiques et exercent sur le cadre rigide 14a., 14b un effort selon la direction X appliquant la partie terminale 13a, 13b contre les aimants 12a, 12b. Les pattes 16b sont dimensionnées pour exercer un effort prédéterminé pour une hauteur minimale théorique de ladite partie 13a, 13b du noyau 7a, 7b compte tenu de tolérances de fabrication de 1 'actionneur . On notera que les pattes sont ici légèrement arquées de sorte qu'elles sont déformables élastiquement entre un état de repos arqué et un état déformé sensiblement rec- tiligne.The end portion 13a., 13b is held against the magnets 12a, 12b by a fastening flange comprising a rigid frame 14a., 14b which extends in the parallel grooves 17a, 17b formed on the free face of the end portion 13a. , 13b (the free face is opposite the pallet 3) and which has opposite portions 15a, 15b protruding from the core 7a, 7b (the portions of the frame 14a in overflow of the core 7a are not visible in the figures). The rigid frame 14a, 14b is here formed of a circular section wire shaped rectangle, the ends of the wire being disjointed so that the rigid frame 14a., 14b is open. The rigid frame 14a, 14b is applied against the end portion 13a, 13b by tabs 16b (the brackets of the frame 14a are not visible in the figures but are identical to the tabs 16b) extending between the core 7a, 7b and the coil 6a, 6b and each having an end connected to one of the overflow portions 15a, 15b and an opposite end fixed to the housing 5a, 5b. Fixing is done by screwing or riveting. The tabs 16b are elastic and exert on the rigid frame 14a., 14b a force in the direction X applying the end portion 13a, 13b against the magnets 12a, 12b. The tabs 16b are sized to exert a predetermined force for a theoretical minimum height of said portion 13a, 13b of the core 7a, 7b given production tolerances of one actuator. Note that the tabs here are slightly arched so that they are elastically deformable between an arcuate rest state and a substantially straight deformed state.
La branche centrale 10b du noyau 7b est traversée par un plot de guidage 18 solidaire du boîtier 5b et pourvu d'un alésage 19 recevant à coulissement le poussoir 4. Deux rainures 20 parallèles s'étendent de part et d'autre de l'alésage 19 dans le prolongement des rainures 17b pour recevoir le cadre rigide 14b Le cadre rigide 14b s'étend ainsi autour de l'extrémité de l'alésage 19 débouchant du côté de la face libre de la partie terminale 13b.The central branch 10b of the core 7b is traversed by a guide stud 18 secured to the housing 5b and provided with a bore 19 slidably receiving the pusher 4. Two parallel grooves 20 extend on either side of the bore 19 in the extension of the grooves 17b to receive the rigid frame 14b The rigid frame 14b thus extends around the end of the bore 19 opening on the side of the free face of the end portion 13b.
Un tel actionneur 1 est par exemple utilisé pour actionner une soupape de moteur à combustion interne, 1' actionneur étant disposé de sorte que le poussoir 5 s'étende selon l'axe de coulissement de la soupape. L'extrémité du poussoir 5 et l'extrémité de la soupape sont rappelées l'une vers l'autre par des ressorts antagonistes définissant une position d'équilibre de l'ensemble poussoir-soupape dans laquelle la palette s'étend sensiblement à mi-chemin entre les deux électroaimants.Such an actuator 1 is for example used to actuate an internal combustion engine valve, one actuator being arranged so that the pusher 5 extends along the sliding axis of the valve. The end of the pusher 5 and the end of the valve are recalled to each other by opposing springs defining an equilibrium position of the pusher-valve assembly in which the pallet extends substantially midway between the two electromagnets.
Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et on peut y apporter des variantes de réalisation sans sortir du cadre de 1 ' invention tel que défini par les revendications.Of course, the invention is not limited to the embodiments described and variations can be made without departing from the scope of the invention as defined by the claims.
En particulier, la bride de fixation peut être agencée pour retenir également- -la—bobine (une partie du cadre s'étend alors également sur la bobine). En outre, la bride de fixation peut également être utilisée pour fixer l'ensemble du noyau au boîtier.In particular, the fixing flange may be arranged to also retain the coil (part of the frame then also extends on the coil). In addition, the mounting flange can also be used to secure the entire core to the housing.
Au lieu d'être fixées au boîtier par rivetage ou vissage, les pattes de la bride de fixation peuvent être soudées au boîtier ou être noyées en partie dans celui- ci .Instead of being fastened to the housing by riveting or screwing, the brackets of the mounting flange may be welded to the housing or partially embedded therein.
En variante, la branche centrale du noyau comporte une partie de pied et une partie terminale entre lesquelles sont disposés à plat des aimants. La fixation de la partie terminale est réalisée par une bride de fixation identique à celle décrite précédemment.Alternatively, the central branch of the core comprises a foot portion and an end portion between which are placed flat magnets. Fixing the end portion is performed by a fastening flange identical to that described above.
La branche centrale, voire 1 ' actionneur, peuvent ne pas être équipés d'aimants permanents.The central branch, or even the actuator, may not be equipped with permanent magnets.
Par ailleurs, les pattes peuvent ne pas être élastiques . In addition, the legs may not be elastic.

Claims

REVENDICATIONS
1. Actionneur (1) électromagnétique comportant un organe d' actionnement (4) associé à une palette (3) et un boîtier (5ει, 5b) dans lequel sont fixés une bobine (6a., 6b) et au moins un noyau (7a, 7b) agencé pour canaliser un flux de la bobine pour qu'il se referme dans la palette, caractérisé en ce qu'il comprend une bride de fixation d'au moins une partie (13a, 13b) du noyau au boîtier, la bride comportant un cadre rigide (14a., 14b) qui possède deux portions (15a, 15b) opposées débordant du noyau et qui est maintenu appliqué selon une direction perpendiculaire à la palette contre ladite partie du noyau par deux pattes (16b) ayant chacune une extrémité fixée au boîtier et une extrémité fixée à une des portions du cadre débordant du noyau.Electromagnetic actuator (1) comprising an actuating member (4) associated with a pallet (3) and a housing (5ει, 5b) in which a coil (6a, 6b) and at least one core (7a) are fixed. , 7b) arranged to channel a stream of the coil so that it closes in the pallet, characterized in that it comprises a flange for fixing at least a portion (13a, 13b) of the core to the housing, the flange having a rigid frame (14a, 14b) which has two opposed portions (15a, 15b) projecting from the core and which is maintained in a direction perpendicular to the pallet against said portion of the core by two tabs (16b) each having one end attached to the housing and an end attached to one of the portions of the frame projecting from the core.
2. Actionneur selon la revendication 1, dans lequel les pattes (16b) sont élastiques de manière à appliquer élastiquement le cadre rigide (14a., 14b) contre ladite partie (13a, 13b) du noyau (7a., 7b) .2. An actuator according to claim 1, wherein the tabs (16b) are resilient so as to resiliently apply the rigid frame (14a, 14b) against said portion (13a, 13b) of the core (7a, 7b).
3. Actionneur selon la revendication 2, dans lequel les pattes (16b) sont dimensionnées pour exercer un effort prédéterminé pour une hauteur minimale théorique de ladite partie (13a., 13b) du noyau (7a, 7b) compte tenu de tolérances de fabrication de 1 ' actionneur .3. An actuator according to claim 2, wherein the tabs (16b) are dimensioned to exert a predetermined force for a theoretical minimum height of said portion (13a, 13b) of the core (7a, 7b) taking into account manufacturing tolerances of 1 'actuator.
4. Actionneur selon la revendication 1, dans lequel le noyau (7a., 7b) comprend une base (8a., 8b) de laquelle s'étendent des branches (9a, 9b) dont une branche centrale (10a_, 10b) autour de laquelle s'étend la bobine (6a., 6b) , la branche centrale comportant une partie de pied (lia, llb) solidaire de la base et une partie terminale (13a., 13b) contre laquelle est appliqué le cadre rigide (14a., 14b) de la bride.4. An actuator according to claim 1, wherein the core (7a., 7b) comprises a base (8a., 8b) of which branches (9a, 9b) including a central branch (10a, 10b) extend around which extends the coil (6a, 6b), the central leg having a foot portion (11a, 11b) integral with the base and an end portion (13a, 13b) against which is applied the rigid frame (14a. , 14b) of the flange.
5. Actionneur selon la Revendication 4, dans lequel au moins un aimant permanent (12a, 12b) est disposé entre la partie de pied (lia., llb) et la partie terminale (13a, 13b) de la branche centrale (10a, 10b) du noyau (7a_, 7b) .An actuator according to claim 4, wherein at least one permanent magnet (12a, 12b) is disposed between the foot portion (11a, 11b) and the end portion (13a, 13b) of the central leg (10a, 10b) of the core (7a, 7b).
6. Actionneur selon la revendication 5, dans lequel deux aimants permanents (12a, 12b) sont disposés dans la branche centrale (10a_, 10b) pour former un V.6. An actuator according to claim 5, wherein two permanent magnets (12a, 12b) are arranged in the central branch (10a, 10b) to form a V.
7. Actionneur selon la revendication 4, dans lequel la branche centrale (10a_, 10b) du noyau (7b) est traversée par un plot de guidage (18) comportant un alésage (19) recevant à coulissement l'organe d' actionnement (4), le cadre rigide (14b) s 'étendant autour d'une extrémité de l'alésage débouchant au niveau de la partie terminale (13b) de la branche centrale (10b) .7. An actuator according to claim 4, wherein the central leg (10a, 10b) of the core (7b) is traversed by a guide pad (18) having a bore (19) slidably receiving the actuating member (4). ), the rigid frame (14b) extending around an end of the bore opening at the end portion (13b) of the central branch (10b).
8. Actionneur selon la revendication 1, dans lequel le cadre rigide (14a, 14b) est ouvert. 8. An actuator according to claim 1, wherein the rigid frame (14a, 14b) is open.
PCT/FR2007/001118 2006-07-25 2007-06-29 Electromagnetic holding flange actuator of the core WO2008012406A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0606801A FR2904467B1 (en) 2006-07-25 2006-07-25 ELECTROMAGNETIC ACTUATOR WITH CORE RETAINING FLANGE
FR0606801 2006-07-25

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WO2008012406A1 true WO2008012406A1 (en) 2008-01-31

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FR (1) FR2904467B1 (en)
WO (1) WO2008012406A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2793596A1 (en) * 1999-05-14 2000-11-17 Siemens Ag ELECTROMAGNETIC POSITION CONTROL DEVICE
US20050211200A1 (en) * 2004-03-25 2005-09-29 Feng Liang Enhanced permanent magnet electromagnetic actuator for an electronic valve actuation system of an engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2793596A1 (en) * 1999-05-14 2000-11-17 Siemens Ag ELECTROMAGNETIC POSITION CONTROL DEVICE
US20050211200A1 (en) * 2004-03-25 2005-09-29 Feng Liang Enhanced permanent magnet electromagnetic actuator for an electronic valve actuation system of an engine

Also Published As

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FR2904467A1 (en) 2008-02-01
FR2904467B1 (en) 2014-05-23

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