EP3234452B1 - Cut-off mechanism including a strip actuated by an electromagnet comprising two air-gaps - Google Patents

Cut-off mechanism including a strip actuated by an electromagnet comprising two air-gaps Download PDF

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Publication number
EP3234452B1
EP3234452B1 EP15805576.4A EP15805576A EP3234452B1 EP 3234452 B1 EP3234452 B1 EP 3234452B1 EP 15805576 A EP15805576 A EP 15805576A EP 3234452 B1 EP3234452 B1 EP 3234452B1
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EP
European Patent Office
Prior art keywords
movable assembly
ferromagnetic core
air gap
axis
plate
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EP15805576.4A
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German (de)
French (fr)
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EP3234452A1 (en
Inventor
Daniel Lopez
Hassan Koulouh
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AML Systems SAS
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AML Systems SAS
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/686—Blades, i.e. screens moving in a vertical plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/16—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed
    • F21V11/18—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed movable, e.g. flaps, slides
    • F21V11/183—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed movable, e.g. flaps, slides pivotable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes

Definitions

  • the field of the present invention is that of light projectors and, more particularly, that of motor vehicle headlights.
  • Motor vehicle headlamps generally comprise a reflector in which are arranged a light source and means for controlling the shape of the beam to adapt it to the driving circumstances.
  • a cut-off strip allowing various phases of occultation of the light beam.
  • the strip is electrically actuated to move, on command, between at least two angular positions in which it more or less obscures the light beam.
  • This makes it possible to limit the range of the headlamp, for example to that of dipped beam headlights, called low beam position, so as not to dazzle drivers traveling in the opposite direction, or even to that of main beam headlights, called high beam position, in which it does not there is no concealment.
  • the devices of the prior art which control the position of the bar generally consist of an actuation motor associated with a sensor of the position of the cut-off bar or with a stop which defines the rest position of the bar.
  • this rest position is associated with the dipped position, in order to avoid dazzling drivers coming in the opposite direction in the event of a failure of the bar actuating device.
  • the return to the stop position or to the extreme position is generally ensured by a spring.
  • an electromagnet which exerts, against a return spring, an attraction force on a moving assembly connected to the cut-off bar. It also includes a metal carcass which forms a cradle for the electromagnet and which ensures its magnetic looping.
  • the electromagnet comprises an induction coil formed by turns which are supplied with electric current to actuate the motor, and a ferromagnetic core which is placed in the center of the coil. This core is fixed longitudinally in the coil and has the function of serving as a point of attraction for the moving assembly when the coil is energized.
  • the document EP 2 180 245 A1 describes a cut-off mechanism for headlights comprising a bar carried by a moving assembly and a motor for actuating said assembly with an electromagnet.
  • the object of the present invention is therefore to propose a control mechanism for a switch bar which does not have the drawbacks of the prior art and in particular which, while remaining low cost, is not sensitive to the phenomenon of magnetic remanence. and, consequently, does not exhibit any sticking of the moving assembly when the current is cut off.
  • the subject of the invention is a switch-off mechanism for a motor vehicle headlamp comprising a bar carried by a mobile rotating element and shaped to more or less block a light beam so as to change the optical operating mode of said headlamp.
  • said mechanism further comprising a motor for actuating said movable assembly using an electromagnet comprising an induction coil associated with a fixed ferromagnetic core positioned at its center and with a metal frame surrounding said coil, said movable assembly being movable, between a position in contact in which said movable assembly is in contact with the ferromagnetic core under the action of said electromagnet, against a return spring and a remote position in which said assembly moving part is at a distance from said ferromagnetic core via a first air gap under the action of the return spring, characterized in that said moving part is a a ferromagnetic plate formed by an upper plate and a lower plate extending on either side of the axis of rotation of the movable assembly, said axis of rotation
  • This break prevents the ferromagnetic parts constituting the control motor from becoming magnetized during the activation of this motor and from remaining stuck, even temporarily, to each other when this activation is stopped.
  • Said break in continuity forms a second air gap h2 in said magnetic circuit.
  • said magnetic circuit generates in said second air gap a force of attraction on the moving assembly which tends to keep it in contact with the ferromagnetic core. This additional force allows the main attraction force to be sized to a smaller value, without reducing the ability of the ferromagnetic parts to remain in contact during motor activation.
  • said movable assembly is a ferromagnetic plate formed by an upper plate and a lower plate extending on either side of an axis of rotation, said axis of rotation being placed, without contact, in alignment with a branch of the metal carcass.
  • the upper plate extends substantially in alignment with said branch of the metal carcass.
  • said lower plate approaches a branch of the metal carcass, until said second air gap h2 is created, in the rotation bringing the upper plate into contact with the ferromagnetic core.
  • the lower plate extends, in the rest position, substantially parallel to the axis of symmetry of said induction coil.
  • said axis of rotation is positioned above said induction coil.
  • the lever arm for actuating the moving assembly then being weak, the force of attraction thereon may be weak and the induction coil dimensioned accordingly.
  • the invention also relates to a headlamp for a motor vehicle comprising a cut-off mechanism as described above.
  • a motor vehicle headlamp comprising a lens holder 1 of cylindrical shape which extends forwards from a frame 2 of rectangular shape. This extends in a plane perpendicular to the optical axis of the beam and is cut out at its center to allow said beam to pass.
  • the cut-off mechanism On this frame is fixed the cut-off mechanism whose function is to more or less block the beam depending on the vehicle traffic conditions.
  • a light source generating the beam and a reflector which directs this beam forwards and towards the lens (not shown) which is installed at the front end of the lens holder 1.
  • the bar is retracted, that is to say it is inclined downwards and reveals the fixed cover 4, which allows almost all of the light beam to pass.
  • the bar is raised and it cuts the beam over a greater height than would the single fixed cover 4. After its reversal by the lens, the beam is then oriented downwards, which avoids dazzling the drivers of vehicles coming reverse.
  • the figure 4 and 5 show the cut-off mechanism 3 according to one embodiment, respectively, in the assembled position and in the exploded position.
  • This cut-off mechanism comprises a cut-off strip 5 which is rotatable around a first tenon 31 attached to a fixed structure 30 linked to the armature 2. It pivots around the first tenon 31, in response to a control of the actuating motor, under the action of a lever arm 42 of a moving element 40, as will be explained later.
  • This fixed structure 30 firstly comprises a plate 32 to which is attached an electromagnet coil 61 which is supplied, as needed, with electric current to rotate or release the mobile assembly and the bar of cut 5. It also comprises two supports 33, which are linked to the plate 32, and which have the function of receiving an axis of rotation 41 linked to the mobile assembly 40 which drives the bar 5. It finally comprises an electrical connector 34 through which the electromagnet control current flows.
  • the two supports 33 each have the shape of a V-piece with two uprights which gradually move away from each other to form a guide during the introduction of the axis of rotation 41 of the moving crew.
  • the bottom of the V has a cylindrical cutout serving as a housing for this axis of rotation once it is placed on the fixed structure 30.
  • the diameter of this cylindrical cutout is slightly greater than the spacing of the two branches at the bottom of the V, so as to form a retaining clip for this axis after its introduction.
  • the motor 6 for actuating the bar 5 is conventionally constituted by the winding 61, which is attached to the plate 32 at its upper part and to a second plate 32b at its lower part, and by a fixed ferromagnetic core 62, substantially cylindrical , which is placed in the center of this winding, along its axis of symmetry.
  • This ferromagnetic core 62 carries at its upper end a circular plate 63, of diameter greater than that of the core 62, which protrudes from the plate 32 and serves as a pole of attraction for the mobile assembly 40.
  • This core is positioned so fixed inside the winding 61 and serves as a guide, inside the winding, for the lines of force electromagnetic waves which are generated by the passage of a current in the electromagnet of motor 6. These lines of force are used to generate an attraction of the mobile assembly 40 by the circular plate 63.
  • the motor 6 further comprises a metal frame 64, in the shape of a U, which surrounds the coil 61 and which is conventionally intended to serve as a guide for the electromagnetic lines of force outside the coil 61. While the central branch of the carcass, formed by the bottom of the U, extends parallel to the axis of the coil 61, its lower branch comes into contact with the second plate 32b, at the level of the foot of the ferromagnetic core 62, and its upper branch returns towards the axis of the coil 61, in its upper part, while remaining however at a distance from the circular plate 63 of the core 62.
  • the moving assembly 40 consists mainly of an L-shaped ferromagnetic plate 43, the purpose of which is on the one hand to ensure continuity in the guiding of the electromagnetic lines of force, in the extension of the metal carcass 64 and in particular in the direction of the axis of the coil 61, and, on the other hand, to maintain an open air gap in this circuit, whether or not this movable plate 43 is in contact with the fixed circular plate 63 of the core of the coil d induction 61.
  • upper plate 43a For this one of the branches of the movable plate, called upper plate 43a, is substantially aligned with the upper branch of the metal carcass 64, between the terminal edge of this branch and the ferromagnetic core 62 while its other branch, said lower plate 43b, is substantially parallel to the central branch of this metal carcass.
  • This quasi-parallelism of the two parts of the movable ferromagnetic plate 43 with the central and upper branches of the metal carcass 64 makes it possible to give a certain continuity to the magnetic circuit around the coil 61 of the electromagnet.
  • the ferromagnetic plate 43 is mobile and carries for this, on its upper plate 43a, an axis of rotation 41, around which the entire mobile assembly 40 rotates.
  • This axis is located at a relatively short distance from the end of the upper plate. 43a, which is located opposite the circular plate 63, so as to reduce the actuating lever arm of the movable assembly by the force of attraction exerted by the ferromagnetic core 62.
  • This short lever arm makes it possible to reduce the size of the electromagnet, which is one of the aims pursued by the invention.
  • the axis of rotation is located laterally above the coil 61, inside the extension of the cylinder formed by the latter.
  • a return spring 45 which rests on the fixed structure 30 and which tends to return the upper plate 43a of the movable assembly away from the circular plate 63 of the ferromagnetic core 62 when no current circulates in the winding.
  • the bar 5 comprises a first cylindrical hole 51 in which is housed the first pin 31 which serves as a pivot for the bar 5, and a second cylindrical hole 54 in which is housed a second pin 44 which extends at the end of this arm 42, parallel to the axis of rotation 41, to serve as an actuating means for said bar.
  • the figures 6 and 7 show the relative arrangement of the movable plate 43 and of the metal carcass 64, respectively, in the two positions that the movable assembly 40 can take, that is to say, on the one hand, in the rest position ( figure 6 ) and, on the other hand, under the action of the passage of a current in the coil 61 ( figure 7 ).
  • the ferromagnetic core 62 attracts the upper plate 43a of the movable plate which comes into contact with it against the return spring 45.
  • the air gap h1 is then reduced to nothing.
  • the lower plate 43b approaches the central branch of the metal carcass 64 to the point of creating with it a second air gap h2, without contact.
  • the lines of force starting from the ferromagnetic core 62 pass through the lower branch then through the lower part of the central branch of the metal carcass 64; they then cross the air gap h2 to then follow the lower 43b then upper 43a plates and close the circuit by the contact between this upper plate and the circular plate 63.
  • the magnetic circuit has an air gap (h1 or h2) which opens the magnetic circuit and prevents its components from magnetizing when the winding is energized, which eliminates the risk of the upper plate 43a sticking against the circular plate 63 .
  • Mobile assembly 40 in its rest position, is moved away from ferromagnetic core 62 under the action of return spring 45 and leaves an air gap h1 between its upper plate 43a and circular plate 63 of this core.
  • This air gap is chosen to be of a relatively small size so that the upper plate 43a can be attracted by the magnetic core thanks to a low intensity current in the coil 61.
  • the coil 61 of the electromagnet can thus be chosen of small size, which is, here again, one of the aims pursued by the invention.
  • the lower plate 43b is relatively far from the metal carcass 64.
  • the space left free between the lower plate 43b and the central branch of the metal carcass 64 is calibrated so as to form a relatively small air gap h2 between these two parts. Because the magnetic circuit, in the activation position of the cut-off mechanism, passes through this lower plate and this central branch, an attraction is created between these two parts. This force is added to that of attraction of the upper plate 43a towards the circular plate 63 and makes it possible to guarantee permanent contact between the movable plate and the ferromagnetic core. This additional force makes it possible, for example, to take into account the jolts due to bumps in the road, which could separate these two parts. There is then no need to oversize the main force of attraction linked to the first air gap h1 to take these hazards into account.
  • the mobile assembly 40 is in the rest position or in the activation position, that the magnetic circuit passes through the axis of rotation 41.
  • this runs along the upper branch of the carcass to join the upper plate 43a at this axis of rotation; in the other case it circulates on the lower part of the central branch of the metal carcass 64 then on the movable plate 43 and therefore passes through the axis of rotation 41.
  • This situation gives complete freedom to position the axis of rotation laterally 41, as long as it remains in this magnetic circuit.
  • the invention thus makes it possible to place it as close as possible to the circular plate 63 and therefore to greatly reduce the lever arm which actuates the rotation of the mobile assembly 40.
  • the axis of rotation 41 is positioned laterally above the coil 61, secantly with the cylinder extending the latter upwards or downwards. And by arranging to balance the masses of the mobile assembly and of the cut-off bar around this axis of rotation 41, the force of attraction necessary to rotate this assembly can be relatively low. The invention then only requires a coil 61 of small size, contrary to what the prior art proposes.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

Le domaine de la présente invention est celui des projecteurs de lumière et, plus particulièrement, celui des projecteurs pour véhicule automobile.The field of the present invention is that of light projectors and, more particularly, that of motor vehicle headlights.

Les projecteurs de véhicule automobile comprennent généralement un réflecteur dans lequel sont disposés une source lumineuse et des moyens de contrôle de la forme du faisceau pour adapter celui-ci aux circonstances de la conduite.Motor vehicle headlamps generally comprise a reflector in which are arranged a light source and means for controlling the shape of the beam to adapt it to the driving circumstances.

Il est connu d'utiliser une barrette de coupure permettant diverses phases d'occultation du faisceau lumineux. La barrette est actionnée électriquement pour se déplacer, sur commande, entre au moins deux positions angulaires dans lesquelles elle occulte plus ou moins le faisceau lumineux. Ceci permet de limiter la portée du projecteur, par exemple à celle des feux de croisement, dite position code, pour ne pas éblouir les conducteurs circulant en sens inverse, ou encore à celle des feux de route, dite position route, dans laquelle il n'y a pas d'occultation.It is known to use a cut-off strip allowing various phases of occultation of the light beam. The strip is electrically actuated to move, on command, between at least two angular positions in which it more or less obscures the light beam. This makes it possible to limit the range of the headlamp, for example to that of dipped beam headlights, called low beam position, so as not to dazzle drivers traveling in the opposite direction, or even to that of main beam headlights, called high beam position, in which it does not there is no concealment.

Les dispositifs de l'art antérieur qui commandent la position de la barrette sont généralement constitués par un moteur d'actionnement associé à un capteur de la position de la barrette de coupure ou à une butée qui définit la position de repos de la barrette. Pour des raisons de sécurité cette position de repos est associée à la position code, afin d'éviter un éblouissement des conducteurs venant en sens inverse dans le cas d'une panne du dispositif d'actionnement de la barrette. Le rappel sur la position de butée ou sur la position extrême est généralement assuré par un ressort.The devices of the prior art which control the position of the bar generally consist of an actuation motor associated with a sensor of the position of the cut-off bar or with a stop which defines the rest position of the bar. For safety reasons, this rest position is associated with the dipped position, in order to avoid dazzling drivers coming in the opposite direction in the event of a failure of the bar actuating device. The return to the stop position or to the extreme position is generally ensured by a spring.

Pour la réalisation des moteurs d'actionnement il est connu d'utiliser un électroaimant qui exerce, à l'encontre d'un ressort de rappel, une force d'attraction sur un équipage mobile lié à la barrette de coupure. Il comprend également une carcasse métallique qui forme un berceau pour l'électroaimant et qui assure son bouclage magnétique. L'électroaimant comprend une bobine d'induction formée par des spires qui sont alimentées en courant électrique pour actionner le moteur, et un noyau ferromagnétique qui est placé au centre du bobinage. Ce noyau est fixe longitudinalement dans la bobine et a pour fonction de servir de point d'attraction pour l'équipage mobile lorsque la bobine est alimentée.For the realization of the actuation motors it is known to use an electromagnet which exerts, against a return spring, an attraction force on a moving assembly connected to the cut-off bar. It also includes a metal carcass which forms a cradle for the electromagnet and which ensures its magnetic looping. The electromagnet comprises an induction coil formed by turns which are supplied with electric current to actuate the motor, and a ferromagnetic core which is placed in the center of the coil. This core is fixed longitudinally in the coil and has the function of serving as a point of attraction for the moving assembly when the coil is energized.

Le document EP 2 180 245 A1 décrit un mécanisme de coupure pour des phares comprenant une barrette portée par un équipage mobile et un moteur d'actionnement dudit équipage avec un électroaimant.The document EP 2 180 245 A1 describes a cut-off mechanism for headlights comprising a bar carried by a moving assembly and a motor for actuating said assembly with an electromagnet.

Un des problèmes rencontrés avec un tel électroaimant est que le noyau ferromagnétique, même s'il est réalisé en fer ou en acier doux, se magnétise quelque peu pendant le passage du courant et qu'il conserve un magnétisme rémanent après la coupure du courant. On assiste alors à un phénomène de collage de l'équipage mobile pendant un temps qui, même s'il est très court, reste incompatible des délais de réaction qui sont demandés pour la rotation d'une barrette d'un mécanisme de coupure.One of the problems encountered with such an electromagnet is that the ferromagnetic core, even if it is made of iron or mild steel, becomes somewhat magnetized during the passage of the current and that it retains a remanent magnetism after the current has been cut. There is then a phenomenon of sticking of the moving assembly for a time which, even if it is very short, remains incompatible with the reaction times which are required for the rotation of a strip of a cut-off mechanism.

Des solutions ont été proposées, telles que l'introduction d'un matériau non ferromagnétique, comme par exemple du cuivre, entre le noyau de l'électroaimant et l'équipage mobile, ou bien une disposition qui tend à augmenter le couple de rappel sur cet équipage mobile. Il peut s'agir, pour cela, d'une augmentation de la force de rappel du ressort ou d'une augmentation du bras de levier par lequel ce ressort agit. Ces solutions ont pour désavantage, soit d'être relativement chères (cas du cuivre), soit de nécessiter un électroaimant de taille supérieure, ce qui n'est pas souhaitable tant sur le plan du prix que de celui de l'encombrement.Solutions have been proposed, such as the introduction of a non-ferromagnetic material, such as copper, between the core of the electromagnet and the moving assembly, or else an arrangement which tends to increase the restoring torque on this moving crew. It may be, for this, an increase in the return force of the spring or an increase in the lever arm by which this spring acts. These solutions have the disadvantage either of being relatively expensive (case of copper), or of requiring an electromagnet of greater size, which is undesirable both in terms of price and size.

La présente invention a donc pour but de proposer un mécanisme de commande d'une barrette de coupure qui ne présente pas les inconvénients de l'art antérieur et notamment qui, en restant à bas coût, n'est pas sensible au phénomène de rémanence magnétique et, par conséquent, ne présente pas de collage de l'équipage mobile à la coupure du courant.The object of the present invention is therefore to propose a control mechanism for a switch bar which does not have the drawbacks of the prior art and in particular which, while remaining low cost, is not sensitive to the phenomenon of magnetic remanence. and, consequently, does not exhibit any sticking of the moving assembly when the current is cut off.

A cet effet, l'invention a pour objet un mécanisme de coupure pour projecteur de véhicule automobile comprenant une barrette portée par un équipage mobile en rotation et conformée pour obturer plus ou moins un faisceau lumineux de manière à changer le mode de fonctionnement optique dudit projecteur, ledit mécanisme comprenant en outre un moteur d'actionnement dudit équipage mobile à l'aide d'un électro-aimant comportant une bobine d'induction associée à un noyau ferromagnétique fixe positionné en son centre et à une carcasse métallique entourant ladite bobine, ledit équipage mobile étant mobile, entre une position au contact dans laquelle ledit équipage mobile est en contact avec le noyau ferromagnétique sous l'action dudit électro-aimant, à l'encontre d'un ressort de rappel et une position à distance dans laquelle ledit équipage mobile est à distance dudit noyau ferromagnétique via un premier entrefer sous l'action du ressort de rappel,caractérisé en ce que ledit équipage mobile est une plaque ferromagnétique formée par une plaque supérieure et une plaque inférieure s'étendant de part et d'autre de l' axe de rotation de l'équipage mobile, ledit axe de rotation étant placé, sans contact, dans l'alignement d'une branche supérieure de la carcasse métallique, ledit équipage mobile étant conformé, quand un courant circule dans la bobine pour créer un second entrefer dans le circuit magnétique formé par ledit noyau ferromagnétique, ladite carcasse métallique et ledit équipage mobile, la plaque supérieure venant alors au contact dudit noyau ferromagnétique par l'attraction du noyau ferromagnétique sur la plaque supérieure de l'équipage mobile à l'encontre du ressort de rappel, la plaque inférieure s'approchant d'une branche centrale de la carcasse métallique sans contact jusqu'à créer ledit second entrefer le premier entrefer étant réduit à néant.To this end, the subject of the invention is a switch-off mechanism for a motor vehicle headlamp comprising a bar carried by a mobile rotating element and shaped to more or less block a light beam so as to change the optical operating mode of said headlamp. , said mechanism further comprising a motor for actuating said movable assembly using an electromagnet comprising an induction coil associated with a fixed ferromagnetic core positioned at its center and with a metal frame surrounding said coil, said movable assembly being movable, between a position in contact in which said movable assembly is in contact with the ferromagnetic core under the action of said electromagnet, against a return spring and a remote position in which said assembly moving part is at a distance from said ferromagnetic core via a first air gap under the action of the return spring, characterized in that said moving part is a a ferromagnetic plate formed by an upper plate and a lower plate extending on either side of the axis of rotation of the movable assembly, said axis of rotation being placed, without contact, in alignment with a upper branch of the metal carcass, said mobile assembly being shaped, when a current flows in the coil to create a second air gap in the magnetic circuit formed by said ferromagnetic core, said metal carcass and said assembly movable, the upper plate then coming into contact with said ferromagnetic core by the attraction of the ferromagnetic core on the upper plate of the moving assembly against the return spring, the lower plate approaching a central branch of the metallic carcass without contact until said second air gap is created, the first air gap being reduced to nothing.

Cette rupture évite que les pièces ferromagnétiques constituant le moteur de commande ne se magnétisent pendant l'activation de ce moteur et ne restent coller, même temporairement l'une à l'autre lors de l'arrêt de cette activation.This break prevents the ferromagnetic parts constituting the control motor from becoming magnetized during the activation of this motor and from remaining stuck, even temporarily, to each other when this activation is stopped.

Ladite rupture de continuité forme un second entrefer h2 dans ledit circuit magnétique.Said break in continuity forms a second air gap h2 in said magnetic circuit.

De façon plus préférentielle ledit circuit magnétique génère dans ledit second entrefer une force d'attraction sur l'équipage mobile qui tend à le maintenir en contact avec le noyau ferromagnétique. Cette force supplémentaire permet de dimensionner la force principale d'attraction à une valeur plus réduite, sans réduire la capacité des pièces ferromagnétiques à rester en contact pendant l'activation du moteur.More preferably, said magnetic circuit generates in said second air gap a force of attraction on the moving assembly which tends to keep it in contact with the ferromagnetic core. This additional force allows the main attraction force to be sized to a smaller value, without reducing the ability of the ferromagnetic parts to remain in contact during motor activation.

Avantageusement ledit équipage mobile est une plaque ferromagnétique formée par une plaque supérieure et une plaque inférieure s'étendant de part et d'autre d'un axe de rotation, ledit axe de rotation étant placé, sans contact, dans l'alignement d'une branche de la carcasse métallique.Advantageously, said movable assembly is a ferromagnetic plate formed by an upper plate and a lower plate extending on either side of an axis of rotation, said axis of rotation being placed, without contact, in alignment with a branch of the metal carcass.

De façon plus avantageuse la plaque supérieure s'étend sensiblement dans l'alignement de ladite branche de la carcasse métallique.More advantageously, the upper plate extends substantially in alignment with said branch of the metal carcass.

Selon l'invention, ladite plaque inférieure se rapproche d'une branche de la carcasse métallique, jusqu'à créer ledit second entrefer h2, dans la rotation amenant la plaque supérieure au contact du noyau ferromagnétique.According to the invention, said lower plate approaches a branch of the metal carcass, until said second air gap h2 is created, in the rotation bringing the upper plate into contact with the ferromagnetic core.

De façon préférentielle la plaque inférieure s'étend, en position de repos, sensiblement parallèlement à l'axe de symétrie de ladite bobine d'induction.Preferably, the lower plate extends, in the rest position, substantially parallel to the axis of symmetry of said induction coil.

Avantageusement ledit axe de rotation est positionné au dessus de ladite bobine d'induction. Le bras de levier pour actionner l'équipage mobile étant alors faible la force d'attraction sur celui-ci peut être faible et la bobine d'induction dimensionnée en conséquence.Advantageously said axis of rotation is positioned above said induction coil. The lever arm for actuating the moving assembly then being weak, the force of attraction thereon may be weak and the induction coil dimensioned accordingly.

L'invention porte également sur un projecteur pour véhicule automobile comprenant un mécanisme de coupure tel que décrit ci-dessus.The invention also relates to a headlamp for a motor vehicle comprising a cut-off mechanism as described above.

L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative détaillée qui va suivre, d'un mode de réalisation de l'invention donné à titre d'exemple purement illustratif et non limitatif, en référence aux dessins schématiques annexés.The invention will be better understood, and other aims, details, characteristics and advantages thereof will appear more clearly during the detailed explanatory description which follows, of an embodiment of the invention given by way of example. purely illustrative and non-limiting example, with reference to the accompanying schematic drawings.

Sur ces dessins :

  • la figure 1 est une vue en perspective d'un élément d'un phare de véhicule comportant un mécanisme de coupure,
  • les figures 2 et 3 sont des vues de face du mécanisme de coupure de la figure 1, positionné sur une armature, respectivement dans la position de route et de code,
  • la figure 4 est une vue en perspective d'un mécanisme de coupure selon un mode de réalisation de l'invention, en version assemblée,
  • la figure 5 est une vue éclatée montrant, en perspective, les divers éléments constituant le mécanisme de coupure de la figure 4,
  • la figure 6 est une vue schématique du moteur du mécanisme de coupure, en position de repos, et
  • la figure 7 est une vue schématique du moteur du mécanisme de coupure, en position d'activation.
In these drawings:
  • the figure 1 is a perspective view of an element of a vehicle headlight comprising a cut-off mechanism,
  • the figures 2 and 3 are front views of the cut-off mechanism of the figure 1 , positioned on an armature, respectively in the route and code position,
  • the figure 4 is a perspective view of a cut-off mechanism according to one embodiment of the invention, in the assembled version,
  • the figure 5 is an exploded view showing, in perspective, the various elements constituting the cut-off mechanism of the figure 4 ,
  • the figure 6 is a schematic view of the cut-off mechanism motor, in the rest position, and
  • the figure 7 is a schematic view of the cut-off mechanism motor, in the activation position.

Dans la description qui va suivre, les références longitudinales ou latérales se comprennent en référence à l'axe optique du réflecteur et les termes avant ou arrière renvoient à la direction dans laquelle se propage le faisceau lumineux.In the following description, the longitudinal or lateral references are understood with reference to the optical axis of the reflector and the terms front or rear refer to the direction in which the light beam propagates.

En se référant à la figure 1, on voit la partie avant d'un projecteur de véhicule automobile comprenant un porte-lentille 1 de forme cylindrique qui s'étend vers l'avant à partir d'une armature 2 de forme rectangulaire. Celle-ci s'étend dans un plan perpendiculaire à l'axe optique du faisceau et est découpée en son centre pour laisser passer ledit faisceau. Sur cette armature est fixé le mécanisme de coupure dont la fonction est d'obturer plus ou moins le faisceau en fonction des conditions de circulation du véhicule. De façon non visible, sont disposés en arrière de cette armature, une source lumineuse génératrice du faisceau et un réflecteur qui oriente ce faisceau vers l'avant et vers la lentille (non illustrée) qui est installée à l'extrémité avant du porte-lentille 1.By referring to the figure 1 , we see the front part of a motor vehicle headlamp comprising a lens holder 1 of cylindrical shape which extends forwards from a frame 2 of rectangular shape. This extends in a plane perpendicular to the optical axis of the beam and is cut out at its center to allow said beam to pass. On this frame is fixed the cut-off mechanism whose function is to more or less block the beam depending on the vehicle traffic conditions. In a non-visible way, are arranged behind this frame, a light source generating the beam and a reflector which directs this beam forwards and towards the lens (not shown) which is installed at the front end of the lens holder 1.

En se référant aux figures 2 et 3 on voit, en vue de face, respectivement en position de route et en position de code, le mécanisme de coupure 3 qui est monté en position basse sur l'armature 2. Cette armature comporte, ici en partie basse de sa découpe centrale, un cache fixe 4 qui obture en partie cette découpe et devant lequel peut se mouvoir une barrette de coupure 5 pour moduler la forme du faisceau en sortie du projecteur. Cette barrette 5 est mobile en rotation dans un plan perpendiculaire au faisceau lumineux et est mue par un moteur d'actionnement 6.By referring to figures 2 and 3 we see, in front view, respectively in the driving position and in the low position, the cut-off mechanism 3 which is mounted in the low position on the armature 2. This armature comprises, here in the lower part of its central cutout, a fixed cover 4 which partially closes off this cutout and in front of which a cut-off bar 5 can move to modulate the shape of the beam exiting from the headlamp. This bar 5 is rotatable in a plane perpendicular to the light beam and is driven by an actuating motor 6.

Sur la figure 2, correspondant à la position de route, la barrette est escamotée, c'est-à-dire qu'elle est inclinée vers le bas et laisse apparaître le cache fixe 4, ce qui laisse passer la quasi-totalité du faisceau lumineux. Sur la figure 3, correspondant à la position code, la barrette est relevée et elle coupe le faisceau sur une plus grande hauteur que ne le ferait le seul cache fixe 4. Après son renversement par la lentille, le faisceau est alors orienté vers le bas, ce qui évite d'éblouir les conducteurs des véhicules venant en sens inverse.On the figure 2 , corresponding to the road position, the bar is retracted, that is to say it is inclined downwards and reveals the fixed cover 4, which allows almost all of the light beam to pass. On the picture 3 , corresponding to the code position, the bar is raised and it cuts the beam over a greater height than would the single fixed cover 4. After its reversal by the lens, the beam is then oriented downwards, which avoids dazzling the drivers of vehicles coming reverse.

Les figures 4 et 5 montrent le mécanisme de coupure 3 selon un mode de réalisation, respectivement, en position assemblée et en position éclatée.The figure 4 and 5 show the cut-off mechanism 3 according to one embodiment, respectively, in the assembled position and in the exploded position.

Ce mécanisme de coupure selon l'invention comporte une barrette de coupure 5 qui est mobile en rotation autour d'un premier tenon 31 rattaché à une structure fixe 30 liée à l'armature 2. Elle pivote autour du premier tenon 31, en réponse à une commande du moteur d'actionnement, sous l'action d'un bras de levier 42 d'un équipage mobile 40, comme cela sera expliqué plus loin.This cut-off mechanism according to the invention comprises a cut-off strip 5 which is rotatable around a first tenon 31 attached to a fixed structure 30 linked to the armature 2. It pivots around the first tenon 31, in response to a control of the actuating motor, under the action of a lever arm 42 of a moving element 40, as will be explained later.

Cette structure fixe 30 comprend tout d'abord, une platine 32 à laquelle est attaché un bobinage d'électroaimant 61 qui est alimenté, en tant que de besoin, en courant électrique pour mettre en rotation ou relâcher l'équipage mobile et la barrette de coupure 5. Elle comprend également deux supports 33, qui sont liés à la platine 32, et qui ont pour fonction de recevoir un axe de rotation 41 lié à l'équipage mobile 40 qui entraîne la barrette 5. Elle comprend enfin un connecteur électrique 34 par lequel transite le courant de commande de l'électroaimant.This fixed structure 30 firstly comprises a plate 32 to which is attached an electromagnet coil 61 which is supplied, as needed, with electric current to rotate or release the mobile assembly and the bar of cut 5. It also comprises two supports 33, which are linked to the plate 32, and which have the function of receiving an axis of rotation 41 linked to the mobile assembly 40 which drives the bar 5. It finally comprises an electrical connector 34 through which the electromagnet control current flows.

Les deux supports 33 ont, chacun, la forme d'une pièce en V avec deux montants qui s'écartent progressivement l'un de l'autre pour former un guide lors de l'introduction de l'axe de rotation 41 de l'équipage mobile. Le fond du V comporte une découpe cylindrique servant de logement pour cet axe de rotation une fois qu'il est mis en place sur la structure fixe 30. Le diamètre de cette découpe cylindrique est légèrement supérieur à l'écartement des deux branches en fond du V, de façon à former un clipsage de retenue pour cet axe après son introduction.The two supports 33 each have the shape of a V-piece with two uprights which gradually move away from each other to form a guide during the introduction of the axis of rotation 41 of the moving crew. The bottom of the V has a cylindrical cutout serving as a housing for this axis of rotation once it is placed on the fixed structure 30. The diameter of this cylindrical cutout is slightly greater than the spacing of the two branches at the bottom of the V, so as to form a retaining clip for this axis after its introduction.

Le moteur 6 d'actionnement de la barrette 5 est constitué classiquement par le bobinage 61, qui est attaché à la platine 32 à sa partie supérieure et à un seconde platine 32b à sa partie inférieure, et par un noyau ferromagnétique fixe 62, sensiblement cylindrique, qui est placé au centre de ce bobinage, le long de son axe de symétrie. Ce noyau ferromagnétique 62 porte à son extrémité supérieure, une plaque circulaire 63, de diamètre supérieur à celui du noyau 62, qui dépasse de la platine 32 et sert de pole d'attraction à l'équipage mobile 40. Ce noyau est positionné de façon fixe à l'intérieur du bobinage 61 et sert de guide, à l'intérieur du bobinage, aux lignes de force électromagnétiques qui sont générées par le passage d'un courant dans l'électroaimant du moteur 6. Ces lignes de force servent à générer une attraction de l'équipage mobile 40 par la plaque circulaire 63.The motor 6 for actuating the bar 5 is conventionally constituted by the winding 61, which is attached to the plate 32 at its upper part and to a second plate 32b at its lower part, and by a fixed ferromagnetic core 62, substantially cylindrical , which is placed in the center of this winding, along its axis of symmetry. This ferromagnetic core 62 carries at its upper end a circular plate 63, of diameter greater than that of the core 62, which protrudes from the plate 32 and serves as a pole of attraction for the mobile assembly 40. This core is positioned so fixed inside the winding 61 and serves as a guide, inside the winding, for the lines of force electromagnetic waves which are generated by the passage of a current in the electromagnet of motor 6. These lines of force are used to generate an attraction of the mobile assembly 40 by the circular plate 63.

Le moteur 6 comprend en outre une carcasse métallique 64, en forme de U, qui entoure le bobinage 61 et qui a classiquement pour objet de servir de guide aux lignes de force électromagnétiques à l'extérieur de la bobine 61. Alors que la branche centrale de la carcasse, formée par le fond du U, s'étend parallèlement à l'axe de la bobine 61, sa branche inférieure vient au contact de la seconde platine 32b, au niveau du pied du noyau ferromagnétique 62, et sa branche supérieure revient vers l'axe de la bobine 61, dans sa partie supérieure, en restant cependant à distance de la plaque circulaire 63 du noyau 62.The motor 6 further comprises a metal frame 64, in the shape of a U, which surrounds the coil 61 and which is conventionally intended to serve as a guide for the electromagnetic lines of force outside the coil 61. While the central branch of the carcass, formed by the bottom of the U, extends parallel to the axis of the coil 61, its lower branch comes into contact with the second plate 32b, at the level of the foot of the ferromagnetic core 62, and its upper branch returns towards the axis of the coil 61, in its upper part, while remaining however at a distance from the circular plate 63 of the core 62.

Entre la partie terminale de la branche supérieure de la carcasse 64 et la plaque circulaire 63 est positionné l'équipage mobile 40, dont les caractéristiques sont décrites ci-dessous. L'équipage mobile 40 est constitué principalement par une plaque ferromagnétique 43 en forme de L, dont l'objet est d'une part d'assurer une continuité dans le guidage des lignes de force électromagnétiques, dans le prolongement de la carcasse métallique 64 et notamment en direction de l'axe de la bobine 61, et, d'autre part, de maintenir un entrefer ouvert dans ce circuit, que cette plaque mobile 43 soit ou non en contact avec la plaque circulaire fixe 63 du noyau de la bobine d'induction 61. Pour cela une des branches de la plaque mobile, dite plaque supérieure 43a, est alignée sensiblement avec la branche supérieure de la carcasse métallique 64, entre le bord terminal de cette branche et le noyau ferromagnétique 62 tandis que son autre branche, dite plaque inférieure 43b, est sensiblement parallèle à la branche centrale de cette carcasse métallique. Ce quasi-parallélisme des deux parties de la plaque ferromagnétique mobile 43 avec les branches centrale et supérieure de la carcasse métallique 64 permet de donner une certaine continuité au circuit magnétique autour de la bobine 61 de l'électroaimant.Between the terminal part of the upper branch of the carcass 64 and the circular plate 63 is positioned the moving assembly 40, the characteristics of which are described below. The moving assembly 40 consists mainly of an L-shaped ferromagnetic plate 43, the purpose of which is on the one hand to ensure continuity in the guiding of the electromagnetic lines of force, in the extension of the metal carcass 64 and in particular in the direction of the axis of the coil 61, and, on the other hand, to maintain an open air gap in this circuit, whether or not this movable plate 43 is in contact with the fixed circular plate 63 of the core of the coil d induction 61. For this one of the branches of the movable plate, called upper plate 43a, is substantially aligned with the upper branch of the metal carcass 64, between the terminal edge of this branch and the ferromagnetic core 62 while its other branch, said lower plate 43b, is substantially parallel to the central branch of this metal carcass. This quasi-parallelism of the two parts of the movable ferromagnetic plate 43 with the central and upper branches of the metal carcass 64 makes it possible to give a certain continuity to the magnetic circuit around the coil 61 of the electromagnet.

La plaque ferromagnétique 43 est mobile et porte pour cela, sur sa plaque supérieure 43a, un axe de rotation 41, autour duquel tourne tout l'équipage mobile 40. Cet axe est situé à une distance relativement courte de l'extrémité de la plaque supérieure 43a, qui est située en face de la plaque circulaire 63, de façon à réduire le bras de levier d'actionnement de l'équipage mobile par la force d'attraction exercée par le noyau ferromagnétique 62. Ce bras de levier court permet de réduire la taille de l'électroaimant, ce qui est un de buts poursuivis par l'invention. De façon préférentielle l'axe de rotation se situe latéralement au dessus de la bobine 61, à l'intérieur du prolongement du cylindre formée par celle-ci.The ferromagnetic plate 43 is mobile and carries for this, on its upper plate 43a, an axis of rotation 41, around which the entire mobile assembly 40 rotates. This axis is located at a relatively short distance from the end of the upper plate. 43a, which is located opposite the circular plate 63, so as to reduce the actuating lever arm of the movable assembly by the force of attraction exerted by the ferromagnetic core 62. This short lever arm makes it possible to reduce the size of the electromagnet, which is one of the aims pursued by the invention. Preferably, the axis of rotation is located laterally above the coil 61, inside the extension of the cylinder formed by the latter.

Sur cet axe de rotation est positionné un ressort de rappel 45, qui prend appui sur la structure fixe 30 et qui tend à rappeler la plaque supérieure 43a de l'équipage mobile à distance de la plaque circulaire 63 du noyau ferromagnétique 62 quand aucun courant ne circule dans le bobinage.On this axis of rotation is positioned a return spring 45, which rests on the fixed structure 30 and which tends to return the upper plate 43a of the movable assembly away from the circular plate 63 of the ferromagnetic core 62 when no current circulates in the winding.

Enfin, de cet axe de rotation 41 s'étend radialement, sur le côté de la plaque mobile 43, un bras 42 formant levier pour la mise en rotation de la barrette de coupure 5, simultanément avec l'équipage mobile 40. A cette fin la barrette 5 comporte un premier trou cylindrique 51 dans lequel vient se loger le premier tenon 31 qui sert de pivot à la barrette 5, et un second trou cylindrique 54 dans lequel vient se loger un second tenon 44 qui s'étend à l'extrémité de ce bras 42, parallèlement à l'axe de rotation 41, pour servir de moyen d'actionnement à ladite barrette.Finally, from this axis of rotation 41 extends radially, on the side of the movable plate 43, an arm 42 forming a lever for the rotation of the cut-off bar 5, simultaneously with the movable assembly 40. To this end the bar 5 comprises a first cylindrical hole 51 in which is housed the first pin 31 which serves as a pivot for the bar 5, and a second cylindrical hole 54 in which is housed a second pin 44 which extends at the end of this arm 42, parallel to the axis of rotation 41, to serve as an actuating means for said bar.

Les figures 6 et 7 montrent la disposition relative de la plaque mobile 43 et de la carcasse métallique 64, respectivement, dans les deux positions que peut prendre l'équipage mobile 40, c'est-à-dire, d'une part, dans la position de repos (figure 6) et, d'autre part, sous l'action du passage d'un courant dans la bobine 61 (figure 7).The figures 6 and 7 show the relative arrangement of the movable plate 43 and of the metal carcass 64, respectively, in the two positions that the movable assembly 40 can take, that is to say, on the one hand, in the rest position ( figure 6 ) and, on the other hand, under the action of the passage of a current in the coil 61 ( figure 7 ).

Dans la position de repos (figure 6), aucun courant ne passe dans le bobinage 61 et le noyau ferromagnétique 62 n'exerce aucune attraction sur la plaque mobile 43. La plaque supérieure 43a de celle-ci est alors éloignée de la plaque circulaire 63 du noyau ferromagnétique 62, sous l'action du ressort de rappel 45. Il n'y a pas de contact entre ces deux pièces qui sont séparées l'une de l'autre par un entrefer h1. Les lignes de force du circuit magnétique en partant du noyau ferromagnétique 62, passent ainsi par la carcasse métallique 64 puis par la plaque supérieure 43a et se referment sur le noyau 62 au travers de l'entrefer h1In the rest position ( figure 6 ), no current passes through the winding 61 and the ferromagnetic core 62 exerts no attraction on the movable plate 43. The upper plate 43a thereof is then moved away from the circular plate 63 of the ferromagnetic core 62, under the action of the return spring 45. There is no contact between these two parts which are separated from each other by an air gap h1. The lines of force of the magnetic circuit starting from the ferromagnetic core 62, thus pass through the metal carcass 64 then through the upper plate 43a and close on the core 62 through the air gap h1

Dans la position d'activation (figure 7) où un courant circule dans la bobine 61, le noyau ferromagnétique 62 attire la plaque supérieure 43a de la plaque mobile qui vient à son contact à l'encontre du ressort de rappel 45. L'entrefer h1 est alors réduit à néant. En revanche la plaque inférieure 43b se rapproche de la branche centrale de la carcasse métallique 64 au point de créer avec elle un second entrefer h2, sans contact. Dans cette configuration les lignes de force en partant du noyau ferromagnétique 62, passent par la branche inférieure puis par la partie basse de la branche centrale de la carcasse métallique 64 ; elles traversent alors l'entrefer h2 pour suivre ensuite les plaques inférieure 43b puis supérieure 43a et refermer le circuit par le contact entre cette plaque supérieure et la plaque circulaire 63.In the activation position ( figure 7 ) where a current flows in the coil 61, the ferromagnetic core 62 attracts the upper plate 43a of the movable plate which comes into contact with it against the return spring 45. The air gap h1 is then reduced to nothing. On the other hand, the lower plate 43b approaches the central branch of the metal carcass 64 to the point of creating with it a second air gap h2, without contact. In this configuration, the lines of force starting from the ferromagnetic core 62, pass through the lower branch then through the lower part of the central branch of the metal carcass 64; they then cross the air gap h2 to then follow the lower 43b then upper 43a plates and close the circuit by the contact between this upper plate and the circular plate 63.

Dans les deux cas le circuit magnétique comporte un entrefer (h1 ou h2) qui ouvre le circuit magnétique et empêche que ses composants se magnétisent quand le bobinage est alimenté, ce qui élimine le risque de collage de la plaque supérieure 43a contre la plaque circulaire 63.In both cases the magnetic circuit has an air gap (h1 or h2) which opens the magnetic circuit and prevents its components from magnetizing when the winding is energized, which eliminates the risk of the upper plate 43a sticking against the circular plate 63 .

On va maintenant décrire le fonctionnement du mécanisme de coupure selon l'invention. L'équipage mobile 40, dans sa position de repos, est éloigné du noyau ferromagnétique 62 sous l'action du ressort de rappel 45 et laisse un entrefer h1 entre sa plaque supérieure 43a et la plaque circulaire 63 de ce noyau. Cet entrefer est choisi d'une dimension relativement faible pour que la plaque supérieure 43a puisse être attirée par le noyau magnétique grâce à un courant de faible intensité dans la bobine 61. La bobine 61 de l'électroaimant peut ainsi être choisie de faible dimension, ce qui est, là encore, un des buts poursuivis par l'invention. Parallèlement la plaque inférieure 43b est relativement éloignée de la carcasse métallique 64.We will now describe the operation of the cut-off mechanism according to the invention. Mobile assembly 40, in its rest position, is moved away from ferromagnetic core 62 under the action of return spring 45 and leaves an air gap h1 between its upper plate 43a and circular plate 63 of this core. This air gap is chosen to be of a relatively small size so that the upper plate 43a can be attracted by the magnetic core thanks to a low intensity current in the coil 61. The coil 61 of the electromagnet can thus be chosen of small size, which is, here again, one of the aims pursued by the invention. At the same time, the lower plate 43b is relatively far from the metal carcass 64.

Lorsqu'un courant est envoyé dans la bobine 61 pour déclencher le passage en position de route pour le projecteur, la plaque supérieure 43a est attirée contre la plaque circulaire 63. Les deux pièces viennent alors en contact mais le circuit magnétique généré par l'électroaimant ne se referme pas pour autant, puisque l'équipage mobile 40 est conformé de façon que la plaque inférieure 43b ne vienne pas en contact avec la carcasse métallique 64. L'écart restant entre ces deux pièces forme le second entrefer h2. On évite ainsi une magnétisation de cette plaque mobile 43 et une rémanence qui produirait un effet de collage de la plaque mobile 43 sur la plaque circulaire 63.When a current is sent through the coil 61 to trigger the switch to the driving position for the headlight, the upper plate 43a is attracted against the circular plate 63. The two parts then come into contact but the magnetic circuit generated by the electromagnet does not close for all that, since the moving assembly 40 is shaped so that the lower plate 43b does not come into contact with the metal carcass 64. The gap remaining between these two parts forms the second air gap h2. This avoids magnetization of this movable plate 43 and remanence which would produce a sticking effect of the movable plate 43 on the circular plate 63.

Par ailleurs l'espace laissé libre entre la plaque inférieure 43b et la branche centrale de la carcasse métallique 64 est calibré de façon à former un entrefer h2 relativement petit entre ces deux pièces. Du fait que le circuit magnétique, en position d'activation du mécanisme de coupure, passe par cette plaque inférieure et cette branche centrale, une attraction se crée entre ces deux pièces. Cette force s'ajoute à celle d'attraction de la plaque supérieure 43a vers la plaque circulaire 63 et permet de garantir une permanence du contact entre la plaque mobile et le noyau ferromagnétique. Cette force supplémentaire permet, par exemple, de prendre en compte les soubresauts dus aux cahots de la route, qui pourraient désolidariser ces deux pièces. Il n'est alors pas besoin de surdimensionner la force d'attraction principale liée au premier entrefer h1 pour tenir compte de ces aléas.Furthermore, the space left free between the lower plate 43b and the central branch of the metal carcass 64 is calibrated so as to form a relatively small air gap h2 between these two parts. Because the magnetic circuit, in the activation position of the cut-off mechanism, passes through this lower plate and this central branch, an attraction is created between these two parts. This force is added to that of attraction of the upper plate 43a towards the circular plate 63 and makes it possible to guarantee permanent contact between the movable plate and the ferromagnetic core. This additional force makes it possible, for example, to take into account the jolts due to bumps in the road, which could separate these two parts. There is then no need to oversize the main force of attraction linked to the first air gap h1 to take these hazards into account.

La double attraction créée par les deux entrefers permet de réduire la taille de la bobine 61 et globalement de tout l'électroaimant, et donc du moteur d'actionnement 3 de la barrette de coupure 5.The double attraction created by the two air gaps makes it possible to reduce the size of the coil 61 and overall of the entire electromagnet, and therefore of the actuating motor 3 of the cut-off bar 5.

On note enfin, que l'équipage mobile 40 soit en position de repos ou en position d'activation, que le circuit magnétique passe par l'axe de rotation 41. Dans un cas celui-ci court le long de la branche supérieure de la carcasse pour rejoindre la plaque supérieure 43a au niveau de cet axe de rotation ; dans l'autre cas il circule sur la partie basse de la branche centrale de la carcasse métallique 64 puis sur la plaque mobile 43 et donc passe par l'axe de rotation 41. Cette situation donne toute liberté pour positionner latéralement l'axe de rotation 41, du moment qu'il reste dans ce circuit magnétique. L'invention permet ainsi de le placer au plus près de la plaque circulaire 63 et donc, de diminuer fortement le bras de levier qui actionne la rotation de l'équipage mobile 40. Dans un mode préférentiel (non illustré sur les figures 6 et 7), l'axe de rotation 41 est positionné latéralement au dessus de la bobine 61, de façon sécante avec le cylindre prolongeant celle-ci vers le haut ou vers le bas. Et en s'arrangeant pour équilibrer les masses de l'équipage mobile et de la barrette de coupure autour de cet axe de rotation 41, la force d'attraction nécessaire pour faire tourner cet ensemble peut être relativement faible. L'invention ne nécessite alors qu'une bobine 61 de faible dimension, contrairement à ce que propose l'art antérieur.Finally, it is noted that the mobile assembly 40 is in the rest position or in the activation position, that the magnetic circuit passes through the axis of rotation 41. In one case, this runs along the upper branch of the carcass to join the upper plate 43a at this axis of rotation; in the other case it circulates on the lower part of the central branch of the metal carcass 64 then on the movable plate 43 and therefore passes through the axis of rotation 41. This situation gives complete freedom to position the axis of rotation laterally 41, as long as it remains in this magnetic circuit. The invention thus makes it possible to place it as close as possible to the circular plate 63 and therefore to greatly reduce the lever arm which actuates the rotation of the mobile assembly 40. In a preferential mode (not illustrated on the figures 6 and 7 ), the axis of rotation 41 is positioned laterally above the coil 61, secantly with the cylinder extending the latter upwards or downwards. And by arranging to balance the masses of the mobile assembly and of the cut-off bar around this axis of rotation 41, the force of attraction necessary to rotate this assembly can be relatively low. The invention then only requires a coil 61 of small size, contrary to what the prior art proposes.

Claims (6)

  1. A cut-off mechanism for an automotive vehicle headlamp comprising a bar (5) carried by a movable assembly (40) movable in rotation and is shaped to block greater or less a light beam so as to change the optical operating mode of said headlamp, said mechanism comprising further a motor (6) for actuating said movable assembly (40) using an electromagnet comprising an inductive coil (61) associated with a fixed ferromagnetic core (62) positioned in its centre and with a metal carcass (64) surrounding said coil (61), said movable assembly (40) being movable, between a contact position in which said movable assembly (40) is in contact with the ferromagnetic core (62) under the action of said electromagnet, against the action of a return spring (45), and a distance position in which said movable assembly (40) is distant from said ferromagnetic core (62) via a first air gap (h1) under the action of the return spring (45),
    characterised in that said movable assembly (40) is a ferromagnetic plate (43) formed by an upper plate (43a) and a lower plate (43b) extending on either side of the axis of rotation (41) of the movable assembly (40), said axis of rotation (41) being placed without contact, in alignment with an upper branch of the metal carcass (64), said movable assembly (40) being shaped, when a current flows in the coil (61), to create a second air gap (h2) in the magnetic circuit formed by said ferromagnetic core (62), said metal carcass (64) and said movable assembly (40), the upper plate coming then into contact with said ferromagnetic core (62) by the attraction of the ferromagnetic core (62) on the upper plate (43a) of the movable assembly (40) against the return spring (45), the lower plate (43b) approaching a central branch of the metal carcass (64) in a noncontacting manner until said second air gap (h2) is created, the first air gap (h1) being reduced to zero.
  2. The mechanism according to claim 1 wherein said magnetic circuit generates in said second air gap (h2) an attractive force on the movable assembly (40) which tends to keep it in contact with the ferromagnetic core (62).
  3. The mechanism according to claim 1 wherein the upper plate (43a) extends substantially in alignment with said upper branch of the metal carcass (64).
  4. The mechanism according to claim 1 wherein the lower plate (43b) extends, in a rest position, substantially parallel to the axis of symmetry of said inductive coil (61).
  5. The mechanism according to one of claims 1 to 4 wherein said axis of rotation (41) is positioned above said inductive coil (61).
  6. An automotive vehicle headlamp comprising a cut-off mechanism according to one of claims 1 to 5.
EP15805576.4A 2014-12-18 2015-11-04 Cut-off mechanism including a strip actuated by an electromagnet comprising two air-gaps Active EP3234452B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1462712A FR3030686B1 (en) 2014-12-18 2014-12-18 CUTTING MECHANISM COMPRISING A BAR ACTUATED BY A TWO GAP ELECTROSIMMER.
PCT/FR2015/052974 WO2016097505A1 (en) 2014-12-18 2015-11-04 Cut-off mechanism including a strip actuated by an electromagnet comprising two air-gaps

Publications (2)

Publication Number Publication Date
EP3234452A1 EP3234452A1 (en) 2017-10-25
EP3234452B1 true EP3234452B1 (en) 2022-04-13

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Application Number Title Priority Date Filing Date
EP15805576.4A Active EP3234452B1 (en) 2014-12-18 2015-11-04 Cut-off mechanism including a strip actuated by an electromagnet comprising two air-gaps

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EP (1) EP3234452B1 (en)
CN (1) CN107002971B (en)
FR (1) FR3030686B1 (en)
WO (1) WO2016097505A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3046833B1 (en) 2016-01-20 2020-02-07 Aml Systems SWITCHING MECHANISM FOR A MOTOR VEHICLE PROJECTOR, ACTUATED BY AN ELECTROMAGNET WITH TWO GAPS.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1389291A (en) * 1920-01-08 1921-08-30 Evan P Bone Headlamp
DE10008935A1 (en) * 2000-02-25 2001-08-30 Hella Kg Hueck & Co Actuating device for a panel in a motor vehicle headlight
ATE537407T1 (en) * 2008-10-23 2011-12-15 Hella Kgaa Hueck & Co HEADLIGHT FOR A MOTOR VEHICLE HAVING A GLARE DEVICE
JP2012018862A (en) * 2010-07-09 2012-01-26 Koito Mfg Co Ltd Headlight for vehicle
DE202012006327U1 (en) * 2012-06-27 2012-07-24 Automotive Lighting Reutlingen Gmbh light module

Also Published As

Publication number Publication date
EP3234452A1 (en) 2017-10-25
CN107002971A (en) 2017-08-01
FR3030686B1 (en) 2017-01-13
FR3030686A1 (en) 2016-06-24
CN107002971B (en) 2020-03-24
WO2016097505A1 (en) 2016-06-23

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