EP3234452A1 - Mécanisme de coupure comportant une barrette actionnée par un électroaimant à deux entrefers - Google Patents
Mécanisme de coupure comportant une barrette actionnée par un électroaimant à deux entrefersInfo
- Publication number
- EP3234452A1 EP3234452A1 EP15805576.4A EP15805576A EP3234452A1 EP 3234452 A1 EP3234452 A1 EP 3234452A1 EP 15805576 A EP15805576 A EP 15805576A EP 3234452 A1 EP3234452 A1 EP 3234452A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ferromagnetic core
- mechanism according
- axis
- contact
- electromagnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 32
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 38
- 239000002184 metal Substances 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 230000005291 magnetic effect Effects 0.000 claims abstract description 18
- 230000009471 action Effects 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims abstract description 3
- 230000006698 induction Effects 0.000 claims description 9
- 238000013459 approach Methods 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 abstract 1
- 230000004913 activation Effects 0.000 description 7
- 238000004804 winding Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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 the light projectors and, more particularly, that of projectors for a motor vehicle.
- 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.
- the bar is electrically actuated to move, on command, between at least two angular positions in which it more or less obscures the light beam.
- the devices of the prior art which control the position of the bar are generally constituted by an actuating motor associated with a sensor of the position of the cutoff bar or a stop which defines the rest position of the bar.
- this rest position is associated with the code position, in order to avoid a glare of the drivers coming in the opposite direction in the event of a failure of the device for actuating the bar.
- the recall on the stop position or on the extreme position is generally ensured by a spring.
- an electromagnet which, against a return spring, exerts a force of attraction on a moving element connected to the cut-off bar.
- a metal casing 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. This core is fixed longitudinally in the coil and serves to serve as a point of attraction for the moving element when the coil is energized.
- the present invention therefore aims to provide a control mechanism of a cutoff bar which does not have the disadvantages of the prior art and in particular which, while remaining low cost, is not sensitive to the phenomenon of magnetic remanence and, therefore, does not exhibit bonding of the moving equipment at power failure.
- the invention relates to a cutting mechanism for a motor vehicle headlamp comprising a motor vehicle headlamp cutoff mechanism comprising a bar carried by a moving element and shaped to close more or less a light beam so as to to change the optical operating mode of said projector, said mechanism further comprising an actuating motor of said moving element with the aid of an electromagnet comprising an induction coil associated with a fixed ferromagnetic core positioned at its center and at a metal carcass surrounding said coil, said moving element being movable under the action of said electromagnet, against a return spring, between a position in contact and a remote position via a first gap h1, said ferromagnetic core, characterized in that said moving element is shaped to create a break in the continuity of the magnetic circuit ue formed by said ferromagnetic core, said metal carcass and said moving element, when it comes into contact with said ferromagnetic core. This break prevents the ferromagnetic parts constituting the control motor from being magnetized during the activation of
- said continuity break forms a second gap h2 in said magnetic circuit.
- said magnetic circuit generates in said second air gap a force of attraction on the moving element which tends to keep it in contact with the ferromagnetic core. This additional force makes it possible to size the main attraction force to a smaller value, without reducing the ability of the ferromagnetic parts to remain in contact during engine activation.
- said moving element 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 the alignment of a branch of the metal carcass.
- the upper plate extends substantially in alignment with said arm of the metal casing.
- said lower plate approaches a branch of the metal casing, 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 to actuate the movable element being then weak the attraction force on it may be low and the induction coil dimensioned accordingly.
- the invention also relates to a motor vehicle headlight comprising a cut-off mechanism as described above.
- FIG. 1 is a perspective view of an element of a vehicle headlight comprising a cut-off mechanism
- FIGS. 2 and 3 are front views of the cut-off mechanism of FIG. 1, positioned on an armature, respectively in the road and code position,
- FIG. 4 is a perspective view of a cut-off mechanism according to one embodiment of the invention, in assembled version,
- FIG. 5 is an exploded view showing, in perspective, the various elements constituting the cut-off mechanism of FIG. 4;
- FIG. 6 is a schematic view of the motor of the breaking mechanism, in the rest position.
- FIG. 7 is a schematic view of the motor of the cutoff mechanism, in the activation position.
- a motor vehicle headlight comprising a cylindrical lens holder 1 which extends forwardly from a frame 2 of rectangular shape. This extends in a plane perpendicular to the optical axis of the beam and is cut at its center to let said beam.
- the cutoff mechanism On this frame is fixed the cutoff mechanism whose function is to close more or less the beam depending on the traffic conditions of the vehicle.
- a light source generating the beam
- a reflector that directs the beam forward and to the lens (not shown) which is installed at the front end of the lens holder 1.
- the cut-off mechanism 3 which is mounted in a low position on the armature 2 is seen.
- This armature comprises, here in FIG. lower part of its central cutout, a fixed cover 4 which partially closes this cut and in front of which can move a cutoff bar 5 to modulate the shape of the beam output of the projector.
- This strip 5 is rotatable in a plane perpendicular to the light beam and is driven by an actuating motor 6.
- 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 the entire beam luminous.
- FIG. 3 corresponding to the code position, the bar is raised and it cuts the beam to a greater height than the only fixed cover 4. After its overthrow by the lens, the beam is then oriented downwards, which avoids dazzling drivers of vehicles coming reverse.
- Figures 4 and 5 show the cutting mechanism 3 according to an embodiment, respectively, in the assembled position and exploded position.
- This cutting mechanism comprises a cutoff bar 5 which is rotatable about a first pin 31 attached to a fixed structure 30 connected to the frame 2. It pivots around the first pin 31, in response to a control of the actuating motor, under the action of a lever arm 42 of a moving assembly 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 necessary, with electric current to rotate or release the mobile assembly and the bar of cutoff 5. It also comprises two supports 33, which are connected to the plate 32, and whose function is to receive an axis of rotation 41 connected to the moving element 40 which drives the bar 5. It finally comprises an electrical connector 34 through which the control current of the electromagnet passes.
- the two supports 33 each have the shape of a V-shaped piece with two uprights which gradually move apart from one another to form a guide when the axis of rotation 41 of the mobile crew.
- the bottom of the V comprises a cylindrical cut-out serving as a housing for this axis of rotation once it is put in place on the fixed structure 30.
- the diameter of this cylindrical cut is slightly greater than the spacing of the two branches at the bottom of the V, so as to form a retaining clipping for this axis after its introduction.
- the actuating motor 6 of the bar 5 is conventionally constituted by the coil 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 substantially cylindrical ferromagnetic core 62 , which is placed in the center of this coil, along its axis of symmetry.
- This ferromagnetic core 62 carries at its upper end, a circular plate 63, of greater diameter 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 that fixed inside the winding 61 and serves as a guide, inside the winding, to the lines of force electromagnetic which are generated by the passage of a current in the electromagnet of the engine 6. These lines of force are used to generate an attraction of the moving element 40 by the circular plate 63.
- the motor 6 further comprises a metal casing 64, U-shaped, which surrounds the coil 61 and which conventionally serves to guide 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 foot of the ferromagnetic core 62, and its upper branch returns towards the axis of its coil 61, in its upper part, however remaining away from the circular plate 63 of the core 62.
- the moving element 40 consists mainly of a L-shaped ferromagnetic plate 43, the object of which is, on the one hand, to provide continuity in guiding the electromagnetic lines of force, in the extension of the metal casing 64 and in particular in the direction of the axis of the coil 61, and, secondly, to maintain an open 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. induction 61.
- said upper plate 43a is aligned substantially with the upper branch of the metal casing 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.
- the ferromagnetic plate 43 is movable and carries for this, on its upper plate 43a, an axis of rotation 41, around which rotates all the mobile assembly 40.
- This axis is located at a relatively short distance from the end of the upper plate 43a, which is located in front of the circular plate 63, so as to reduce the operating lever arm of the moving equipment by the attractive force exerted by the ferromagnetic core 62.
- This short lever arm can 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 it.
- a return spring 45 which is supported on the fixed structure 30 and which tends to recall the upper plate 43a of the moving assembly remote 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 to the bar 5, and a second cylindrical hole 54 in which is housed a second pin 44 which extends to the end of this arm 42, parallel to the axis of rotation 41, to serve as actuating means for said bar.
- FIGS. 6 and 7 show the relative disposition of the movable plate 43 and the metal casing 64, respectively, in the two positions that the moving assembly 40 can take, that is to say, on the one hand, in the rest position ( Figure 6) and, secondly, 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 casing 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 and then through the lower part of the central branch of the metal casing 64; they then pass through the air gap h2 to follow then the lower plates 43b and then upper 43a and close the circuit by the contact between this upper plate and the circular plate 63.
- the magnetic circuit includes an air gap (h1 or h2) which opens the magnetic circuit and prevents its components from being magnetized when the winding is energized, which eliminates the risk of bonding the upper plate 43a against the circular plate 63 .
- the moving element 40 in its rest position, is remote from the ferromagnetic core 62 under the action of the return spring 45 and leaves a gap h1 between its upper plate 43a and the circular plate 63 of this core.
- This air gap is chosen to be relatively small in size so that the top plate 43a can be attracted to the magnetic core by a low current in the coil 61.
- the coil 61 of the electromagnet can thus be chosen to be small, which is, again, one of the aims pursued by the invention.
- the lower plate 43b is relatively far from the metal casing 64.
- the space left free between the lower plate 43b and the central branch of the metal casing 64 is calibrated so as to form a relatively small air gap h2 between these two parts. Since the magnetic circuit, in the activation position of the cutting 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 to the circular plate 63 and ensures a 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 jolts of the road, which could separate these two parts. There is no need to oversize the main attraction force related to the first gap h1 to account for these hazards.
- the mobile assembly 40 either in the rest position or in the activation position, that the magnetic circuit passes through the axis of rotation 41. In one case it 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 casing 64 and then on the movable plate 43 and thus passes through the axis of rotation 41. This situation gives complete freedom to position laterally the axis of rotation 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 moving equipment 40.
- the axis of rotation 41 is positioned laterally above the coil 61, secantly with the cylinder extending it upwardly or downwardly. And by arranging to balance the masses of the moving assembly and the cut-off bar around this axis of rotation 41, the attractive force necessary to turn this assembly can be relatively small.
- the invention then only requires a coil 61 of small size, contrary to what is proposed in the prior art.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1462712A FR3030686B1 (fr) | 2014-12-18 | 2014-12-18 | Mecanisme de coupure comportant une barrette actionnee par un electroaimant a deux entrefers. |
PCT/FR2015/052974 WO2016097505A1 (fr) | 2014-12-18 | 2015-11-04 | Mécanisme de coupure comportant une barrette actionnée par un électroaimant à deux entrefers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3234452A1 true EP3234452A1 (fr) | 2017-10-25 |
EP3234452B1 EP3234452B1 (fr) | 2022-04-13 |
Family
ID=52627417
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15805576.4A Active EP3234452B1 (fr) | 2014-12-18 | 2015-11-04 | Mécanisme de coupure comportant une barrette actionnée par un électroaimant à deux entrefers |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3234452B1 (fr) |
CN (1) | CN107002971B (fr) |
FR (1) | FR3030686B1 (fr) |
WO (1) | WO2016097505A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3046833B1 (fr) * | 2016-01-20 | 2020-02-07 | Aml Systems | Mecanisme de coupure pour projecteur de vehicule automobile, actionne par un electroaimant a deux entrefers. |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1389291A (en) * | 1920-01-08 | 1921-08-30 | Evan P Bone | Headlamp |
DE10008935A1 (de) * | 2000-02-25 | 2001-08-30 | Hella Kg Hueck & Co | Betätigungsvorrichtung für eine Blende in einem Kraftfahrzeugscheinwerfer |
ATE537407T1 (de) * | 2008-10-23 | 2011-12-15 | Hella Kgaa Hueck & Co | Scheinwerfer für ein kraftfahrzeug mit einer blendvorrichtung |
JP2012018862A (ja) * | 2010-07-09 | 2012-01-26 | Koito Mfg Co Ltd | 車輌用前照灯 |
DE202012006327U1 (de) * | 2012-06-27 | 2012-07-24 | Automotive Lighting Reutlingen Gmbh | Lichtmodul |
-
2014
- 2014-12-18 FR FR1462712A patent/FR3030686B1/fr not_active Expired - Fee Related
-
2015
- 2015-11-04 EP EP15805576.4A patent/EP3234452B1/fr active Active
- 2015-11-04 WO PCT/FR2015/052974 patent/WO2016097505A1/fr active Application Filing
- 2015-11-04 CN CN201580066614.2A patent/CN107002971B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
CN107002971B (zh) | 2020-03-24 |
FR3030686B1 (fr) | 2017-01-13 |
EP3234452B1 (fr) | 2022-04-13 |
FR3030686A1 (fr) | 2016-06-24 |
CN107002971A (zh) | 2017-08-01 |
WO2016097505A1 (fr) | 2016-06-23 |
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