EP0277850A1 - Motor vehicle headlamp comprising ventilation means - Google Patents

Motor vehicle headlamp comprising ventilation means Download PDF

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Publication number
EP0277850A1
EP0277850A1 EP88400047A EP88400047A EP0277850A1 EP 0277850 A1 EP0277850 A1 EP 0277850A1 EP 88400047 A EP88400047 A EP 88400047A EP 88400047 A EP88400047 A EP 88400047A EP 0277850 A1 EP0277850 A1 EP 0277850A1
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EP
European Patent Office
Prior art keywords
openings
circumferential direction
projector according
windscreen
projector
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Granted
Application number
EP88400047A
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German (de)
French (fr)
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EP0277850B1 (en
Inventor
Victor Achiaga
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Valeo Vision SAS
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Cibie Projecteurs SA
Valeo Vision SAS
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Publication of EP0277850A1 publication Critical patent/EP0277850A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps

Definitions

  • the present invention relates generally to motor vehicle headlamps, and more particularly relates to a sealed housing headlamp equipped with ventilation means.
  • Motor vehicle headlamps are generally housed in closed boxes which prevent the penetration of water or dust to their various parts.
  • Ventilation means are already known in the prior art which make it possible to establish a permanent exchange of air between the interior space of the projector and the exterior, while preventing the penetration into the projector of solid or liquid foreign matter. This avoids the accumulation of water inside the projector during repeated heating and cooling cycles due for example to successive ignition / extinction of the lamp.
  • German patent DAS 1 116 087 describes a projector in which an annular ventilation channel extending in a vertical plane and centered on the axis of the projector opens onto the interior space of the projector in its upper region and opens onto the external environment in its lower region.
  • the channel thus ensures the ventilation of the projector, avoiding the phenomena of condensation inside it, while preventing the penetration of water, mud or dust.
  • the present invention aims to overcome these drawbacks of the prior art and to provide ventilation means in which this risk of blockage is greatly reduced.
  • Another object of the present invention is to provide ventilation means that are particularly easy to produce in large series.
  • the present invention relates to a motor vehicle headlamp, of the type comprising a housing and a closing window defining an interior space, a windscreen closing the housing in its rear region, a lamp and a reflector situated in the interior space.
  • a motor vehicle headlamp of the type comprising a housing and a closing window defining an interior space, a windscreen closing the housing in its rear region, a lamp and a reflector situated in the interior space.
  • Such a configuration is advantageous for the following reasons: - without increasing the size of the windscreen in depth, the openings have a sufficient section to ensure satisfactory ventilation, - the openings being in the form of a slot, their risk of obstruction by runoff of water from inside the channel is considerably reduced, because no capillarity phenomenon takes place, likewise the projections of mud in the direction of the openings n '' are unlikely to obstruct the openings along their entire length; and - the low walls prevent dripping water outside the projector, which can be abundant, from obstructing the slits by capillary action.
  • a protective screen extends opposite the slot-shaped opening or openings between the lower end edges of the two walls.
  • the cross-sectional area of the annular channel is between 6 and 10 mm3.
  • a reduction in this section has the effect of accelerating the elimination of the condensation. This can be explained as follows: when the projector is turned on, its temperature rises and there is an air exchange with the outside, which tends to stabilize this temperature at a value which depends on the channel section. By reducing this usually large section in the above range of values, the equilibrium temperature is slightly increased and the elimination of condensation is accelerated.
  • a motor vehicle headlamp equipped with ventilation means in accordance with the present invention comprises an external housing 10 forming a reflector, a front window 12 closing the housing in a sealed manner 'before this, a filament lamp 16 cooperating with the internal reflecting surface 14 of the housing and a windscreen assembly, generally designated by the reference 18, closing the housing by coming to be applied on the flange 10a provided at its end rear for the passage of the lamp 16.
  • the assembly 18 comprises a rigid ring 20, for example metallic, serving as a support for the lamp 16 by means of appropriate attachment means (not shown), a gasket sealing 22 interposed between the ring 20 and the outer surface of the housing 10, and a windscreen 24 which is applied to the rear of the ring 20.
  • Fixing means (not shown) are provided between the ring 20 and the housing 10, so that their implementation brings the seal 22 in compression to establish an appropriate seal.
  • the ring 20 comprises a radial part 20a delimiting a central opening of the size of the collar 10a, an axial annular boss 20b ensuring the maintenance of the seal 22 (the latter comprising for this purpose a groove complementary), a first cylindrical axial part 20c, a second cylindrical axial part 20d, of diameter slightly greater than the first, and an end bead 20e projecting radially outwards.
  • the windshield 24 made of an elastically deformable material such as rubber, comprises a blind sleeve 24a centrally for receiving the base 16a of the lamp 16, a radial circular part 24b having in an intermediate zone an annular gathering 24c of section in "u" for absorbing any deviations in position in the axial direction between the lamp 16 and the ring 20 secured to the housing 10, a peripheral flange 24d directed towards the housing 10, a radial annular rib 24e extending towards the interior from an intermediate region of the rim, and an annular surface forming a collar 24f projecting vertically inwardly from the end edge of the rim 24d over a greater extent than the rib 24e.
  • a first groove 24g is defined between the rib 24e and the bottom of the windscreen and is capable of receiving, during the mounting of said windscreen on the ring 20, the end bead 20e of the latter, for locking purposes.
  • the respective internal free ends of the rib 24e and the re-entrant collar 24f, which define between them a second groove, come respectively to be applied elastically against the cylindrical surfaces 20d and 20c of the ring 20 when the windscreen is put in place.
  • an annular channel 28 which extends over 360 ° at the periphery of said cup is defined, in part by the windscreen 24 and in part by the ring 20.
  • An opening 30 is provided in the upper region of the windscreen 24 to put the upper end of the annular channel 28 into communication with the interior space of the projector.
  • This opening has the combined form of a rupture of the rib 24e and a recess towards the rear 24g formed in the bottom 24b of the windscreen, which allows air to bypass the end bead from the rear. posterior 20c of the ring 20.
  • the annular channel 28 is placed in communication with the outside by means of two through openings 26a, 26b in the form of slots formed in the rim 24d of the windscreen 24 and extending aligned one with the other in the circumferential direction of the latter.
  • the two slots are arranged symmetrically on either side of the axial vertical plane of the windscreen and, between them, the bottom wall of the channel 28 adopts a dome profile as indicated in 28a, in order to avoid the accumulation of water in this region.
  • the slots may have a width of the order of 2 to 4 mm and a length of the order of 10 to 20 mm, being spaced apart from each other by approximately 5 to 10 mm, these values making it possible to achieve the objectives mentioned above in terms of resistance to obstruction by capillary film and / or by spraying of mud. But it is understood that one can also provide a single opening in the form of a slot, or on the contrary more than two openings.
  • two lateral walls 29a have been provided, 29b, preferably formed in one piece with the windshield, which protrude downwards therefrom by framing the two openings 26a, 26b. It is clear, in particular from FIG. 2, that these two walls protect the openings 26a, 26b both against runoff and against tangential projections.
  • the walls 29a, 29b will advantageously have a height of the order of 5 to 10 mm.
  • a projector is thus produced, the interior space of which, normally closed in a relatively sealed manner, is placed in communication with the exterior by an annular ventilation channel while preventing any foreign material from entering the projector.
  • the shape and arrangement of the openings 26a, 26b opening onto the outside, ensuring simultaneously and under good conditions the exit of the water which has condensed on the walls of the channel at the outer edges of the two slots, and the air outlet and inlet, through the remaining central part of said slots.
  • the protection of the openings 26 to 26b can be further improved by providing, as illustrated in FIG. 4, a screen 31 extending between the lower end edges of the two walls 29a, 29b, facing the openings 26a. , 26b and at a certain distance therefrom, for example at a distance of the order of 5 to 10 mm.
  • a median upright 32 makes it possible to prevent the screen 31 from pressing against the openings and obstructing good ventilation.
  • the windscreen 24 will be made of synthetic rubber loaded with a hydrophobic material.
  • the tendency to form films of water capable of covering the opening or openings for communication with the outside is thus further reduced.
  • the water then condenses in the form of very fine droplets which slide easily on the walls of the channel and the opening (s) to discharge outwards.

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

Abstract

The headlamp is of the type comprising a housing (10) and a sealed glass lens (12) defining an inner space, a cover (24) sealing the housing in its rear region, a lamp (16) and a reflector located inside the inner space and means for ventilating the inner space in the form of an annular channel (28) open to the inner space of the headlamp in its upper region and open to the outside in its lower region. The channel (28) is defined by a groove on the inner surface of a peripheral rim axial to the said cover and is open to the outside by at least one slit-shaped opening (26a) formed in the said rim in a circumferential direction. Furthermore, there are formed, on either side of the opening or openings in the said circumferential direction and transversely to the latter, two small walls (29b) projecting downwards from the said rim. <IMAGE>

Description

La présente invention concerne d'une façon générale les projecteurs de véhicules automobiles, et concerne plus particulièrement un projecteur à boîtier étanche équipé de moyens de ventilation.The present invention relates generally to motor vehicle headlamps, and more particularly relates to a sealed housing headlamp equipped with ventilation means.

Les projecteurs de véhicules automobiles sont généralement abrités dans des boîtiers clos qui permettent d'éviter la pénétration d'eau ou de poussières vers leurs divers organes.Motor vehicle headlamps are generally housed in closed boxes which prevent the penetration of water or dust to their various parts.

Cependant, dans une fabrication en grande sé­rie, il apparaît impossible de donner au boîtier, avec un coût raisonnable, une étanchéité parfaite vis-à-vis de l'environnement extérieur et, à long terme, de l'air char­gé d'humidité est toujours susceptible de pénétrer à l'in­térieur du projecteur.However, in mass production, it appears impossible to give the housing, at a reasonable cost, a perfect seal vis-à-vis the external environment and, in the long term, air laden with moisture is still likely to get inside the projector.

On connaît déjà dans la technique antérieure des moyens de ventilation qui permettent d'établir un échan­ge d'air permanent entre l'espace intérieur du projecteur et l'extérieur, tout en empêchant la pénétration dans le projecteur de matières étrangères solides ou liquides. On évite ainsi l'accumulation d'eau à l'intérieur du projec­teur lors des cycles répétés d'échauffement et de refroidis­sement dus par exemple à des allumages/extinctions succes­sifs de la lampe.Ventilation means are already known in the prior art which make it possible to establish a permanent exchange of air between the interior space of the projector and the exterior, while preventing the penetration into the projector of solid or liquid foreign matter. This avoids the accumulation of water inside the projector during repeated heating and cooling cycles due for example to successive ignition / extinction of the lamp.

En particulier, le brevet allemand DAS 1 116 087 décrit un projecteur dans lequel un canal de ventilation annulaire s'étendant dans un plan vertical et centré sur l'axe du projecteur s'ouvre sur l'espace intérieur du projec­teur dans sa région supérieure et s'ouvre sur l'environnement extérieur dans sa région inférieure. Le canal assure ainsi la ventilation du projecteur, en évitant les phénomènes de condensation à l'intérieur de celui-ci, tout en empêchant la pénétration d'eau, de boue ou de poussière.In particular, the German patent DAS 1 116 087 describes a projector in which an annular ventilation channel extending in a vertical plane and centered on the axis of the projector opens onto the interior space of the projector in its upper region and opens onto the external environment in its lower region. The channel thus ensures the ventilation of the projector, avoiding the phenomena of condensation inside it, while preventing the penetration of water, mud or dust.

Cependant, un fonctionnement satisfaisant de tels moyens de ventilation demande de trouver un compromis concer­ nant notamment la taille de l'ouverture mettant le canal annulaire en communication avec l'extérieur, et en pratique, dans un environ­nement fortement humide, on a constaté avec tous les systèmes de la technique antérieure une tendance de la ou des ouvertures mettant le canal en communication avec l'extérieur à se boucher, soit par for­mation d'un film d'eau capillaire en travers de celles-ci, soit par accumulation de boue ou analogue.However, satisfactory operation of such ventilation means requires a compromise to be found. nant in particular the size of the opening putting the annular channel in communication with the outside, and in practice, in a highly humid environment, it has been observed with all the systems of the prior art a tendency of the opening (s) putting the channel in communication with the outside to be blocked, either by forming a film of capillary water across them, or by accumulation of mud or the like.

La présente invention vise à pallier ces inconvénients de la technique antérieure et à proposer des moyens de ventilation dans lesquels ce risque d'obturation soit fortement atténué.The present invention aims to overcome these drawbacks of the prior art and to provide ventilation means in which this risk of blockage is greatly reduced.

Un autre objet de la présente invention est de proposer des moyens de ventilation particulièrement faciles à réaliser en grande série.Another object of the present invention is to provide ventilation means that are particularly easy to produce in large series.

A cet effet, la présente invention concerne un projecteur de véhicule automobile, du type comprenant un boîtier et une glace de fermeture définissant un espace intérieur, une bonnette fermant le boîtier dans sa région postérieure, une lampe et un réflecteur situés dans l'espace intérieur, et des moyens de ventilation de l'espace inté­rieur sous la forme d'un canal annulaire ouvert sur l'espace intérieur du projecteur dans sa région supérieure et ouvert sur l'extérieur dans sa région inférieure, caractérisé en ce que le canal est défini par une gorge à la surface intérieure d'un rebord périphérique axial de ladite bonnette et est ouvert sur l'extérieur par au moins une ouverture en forme de fente formée dans ledit rebord dans une direction circonféren­tielle, et en ce que sont formés de part et d'autre de la ou des ouver­tures dans ladite direction circonférentielle, transversalement à celles-­ci, deux murets en saillie vers le bas à partir dudit rebord.To this end, the present invention relates to a motor vehicle headlamp, of the type comprising a housing and a closing window defining an interior space, a windscreen closing the housing in its rear region, a lamp and a reflector situated in the interior space. , and means for ventilating the interior space in the form of an annular channel open to the interior space of the projector in its upper region and open to the exterior in its lower region, characterized in that the channel is defined by a groove on the inner surface of an axial peripheral rim of said windscreen and is open to the outside by at least one slit-shaped opening formed in said rim in a circumferential direction, and in that are formed on the side and on the other side of the opening (s) in said circumferential direction, transverse thereto, two low walls projecting downwards from said flange.

Une telle configuration est avantageuse pour les raisons suivantes :
- sans augmenter l'encombrement de la bonnette en profon­deur, les ouvertures ont une section suffisante pour assurer une venti­lation satisfaisante,
- les ouvertures étant en forme de fente, leur risque d'obstruction par ruissellement d'eau depuis l'intérieur du canal est considérablement réduit, car aucun phénomène de capillarité n'a lieu, de même les projections de boue en direction des ouvertures n'auront que peu de chances d'obstruer les ouvertures sur toute leur longueur; et
- les murets empêchent que les ruissellements d'eau à l'extérieur du projecteur, qui peuvent être abondants, n'obstruent les fentes par capillarité.Such a configuration is advantageous for the following reasons:
- without increasing the size of the windscreen in depth, the openings have a sufficient section to ensure satisfactory ventilation,
- the openings being in the form of a slot, their risk of obstruction by runoff of water from inside the channel is considerably reduced, because no capillarity phenomenon takes place, likewise the projections of mud in the direction of the openings n '' are unlikely to obstruct the openings along their entire length; and
- the low walls prevent dripping water outside the projector, which can be abundant, from obstructing the slits by capillary action.

Selon une variante de réalisation, un écran de protection s'étend en regard de la ou des ouvertures en forme de fente entre les bords d'extrémité inférieure des deux murets.According to an alternative embodiment, a protective screen extends opposite the slot-shaped opening or openings between the lower end edges of the two walls.

De façon préférée, la surface de la section trans­versale du canal annulaire est comprise entre 6 et 10 mm³. On a constaté en effet de façon surprenante qu'une dimi­nution de cette section avait pour effet d'accélérer l'éli­mination de la condensation. Ceci peut s'expliquer de la façon suivante : lorsqu'on allume le projecteur, sa tem­pérature s'élève et il se produit alors un échange d'air avec l'extérieur, qui tend à stabiliser cette température à une valeur qui dépend de la section du canal. En rédui­sant cette section, habituellement importante, dans la gamme de valeurs ci-dessus, la température d'équilibre est légèrement augmentée et l'élimination de la condensa­tion est accélérée.Preferably, the cross-sectional area of the annular channel is between 6 and 10 mm³. Surprisingly, it has been found that a reduction in this section has the effect of accelerating the elimination of the condensation. This can be explained as follows: when the projector is turned on, its temperature rises and there is an air exchange with the outside, which tends to stabilize this temperature at a value which depends on the channel section. By reducing this usually large section in the above range of values, the equilibrium temperature is slightly increased and the elimination of condensation is accelerated.

L'invention sera mieux comprise à la lecture de la description détaillée suivante de formes de réalisation préférées de celle-ci, donnée à titre d'exemple et faite en référence aux dessins annexés, sur lesquels :

  • - la figure 1 est une vue en coupe verticale longi­tudinale d'un projecteur incorporant des moyens de venti­lation selon une première forme de réalisation de l'inven­tion,
  • - la figure 2 est une vue en coupe selon la ligne II-II de la figure 1,
  • - la figure 3 est une vue de dessous partielle d'une partie des moyens de ventilation, et
  • - la figure 4 est une vue en coupe transversale d'une variante de réalisation de l'invention.
The invention will be better understood on reading the following detailed description of preferred embodiments thereof, given by way of example and made with reference to the accompanying drawings, in which:
  • FIG. 1 is a view in longitudinal vertical section of a projector incorporating ventilation means according to a first embodiment of the invention,
  • FIG. 2 is a sectional view along the line II-II of FIG. 1,
  • FIG. 3 is a partial bottom view of part of the ventilation means, and
  • - Figure 4 is a cross-sectional view of an alternative embodiment of the invention.

En référence aux dessins, et tout d'abord aux figures 1 à 3 un projecteur de véhicule automobile équipé de moyens de ventilation conformes à la présente invention comprend un boîtier extérieur 10 formant ré­flecteur, une glace frontale 12 fermant le boîtier de ma­nière étanche à l'avant de celui-ci, une lampe à filament 16 coopérant avec la surface réfléchissante interne 14 du boîtier et un ensemble à bonnette, globalement désigné par la référence 18, fermant le boîtier en venant s'appli­quer sur la collerette 10a prévue à son extrémité arrière pour le passage de la lampe 16. L'ensemble 18 comprend une bague rigide 20, par exemple métallique, tenant lieu de support de la lampe 16 par l'intérmédiaire de moyens d'accrochage appropriés (non représentés), un joint d'étan­chéité 22 interposé entre la bague 20 et la surface exté­rieure du boîtier 10, et une bonnette 24 venant s'appliquer à l'arrière de la bague 20. Des moyens de fixation (non-­représentés) sont prévus entre la bague 20 et le boîtier 10, de manière que leur mise en oeuvre amène le joint 22 en compression pour établir une étanchéité appropriée.With reference to the drawings, and firstly to FIGS. 1 to 3, a motor vehicle headlamp equipped with ventilation means in accordance with the present invention comprises an external housing 10 forming a reflector, a front window 12 closing the housing in a sealed manner 'before this, a filament lamp 16 cooperating with the internal reflecting surface 14 of the housing and a windscreen assembly, generally designated by the reference 18, closing the housing by coming to be applied on the flange 10a provided at its end rear for the passage of the lamp 16. The assembly 18 comprises a rigid ring 20, for example metallic, serving as a support for the lamp 16 by means of appropriate attachment means (not shown), a gasket sealing 22 interposed between the ring 20 and the outer surface of the housing 10, and a windscreen 24 which is applied to the rear of the ring 20. Fixing means (not shown) are provided between the ring 20 and the housing 10, so that their implementation brings the seal 22 in compression to establish an appropriate seal.

Comme on peut l'observer, la bague 20 comporte une partie radiale 20a délimitant une ouverture centrale de la taille de la collerette 10a, un bossage annulaire axial 20b assurant le maintien du joint d'étanchéité 22 (ce der­nier comportant à cet effet une rainure complémentaire), une première partie axiale cylindrique 20c, une seconde partie axiale cylindrique 20d, de diamètre légèrement su­périeur à la première, et un bourrelet d'extrémité 20e en saillie radialement vers l'extérieur.As can be observed, the ring 20 comprises a radial part 20a delimiting a central opening of the size of the collar 10a, an axial annular boss 20b ensuring the maintenance of the seal 22 (the latter comprising for this purpose a groove complementary), a first cylindrical axial part 20c, a second cylindrical axial part 20d, of diameter slightly greater than the first, and an end bead 20e projecting radially outwards.

La bonnette 24, réalisée en une matière élastique­ment déformable telle qu'un caoutchouc, comprend centrale­ment un manchon borgne 24a pour la réception du culot 16a de la lampe 16, une partie circulaire radiale 24b présen­tant dans une zone intermédiaire un froncement annulaire 24c de section en "u" permettant d'absorber les éventuels écarts de position en direction axiale entre la lampe 16 et la bague 20 solidaire du boîtier 10, un rebord péri­phérique 24d dirigé vers le boîtier 10, une nervure annulaire radiale 24e s'étendant vers l'intérieur à partir d'une région intermédiaire du rebord, et une sur­face annulaire formant collet 24f en saillie verticale­ment vers l'intérieur à partir du bord d'extrémité du rebord 24d sur une plus grande étendue que la nervure 24e. Une première gorge 24g est définie entre la nervure 24e et le fond de la bonnette et est apte à recevoir, lors du montage de ladite bonnette sur la bague 20, le bourrelet d'extrémité 20e de cette dernière, à des fins de verrouil­lage. De plus, lors de ce montage, les extrémités libres intérieures respectives de la nervure 24e et du collet rentrant 24f, qui définissent entre elles une seconde gorge, viennent respectivement s'appliquer élastiquement contre les surfaces cylindriques 20d et 20c de la bague 20 lorsque la bonnette est mise en place. De cette manière, est défini, en partie par la bonnette 24 et en partie par la bague 20, un canal annulaire 28 qui sʹétend sur 360° à la périphérie de ladite bonnette.The windshield 24, made of an elastically deformable material such as rubber, comprises a blind sleeve 24a centrally for receiving the base 16a of the lamp 16, a radial circular part 24b having in an intermediate zone an annular gathering 24c of section in "u" for absorbing any deviations in position in the axial direction between the lamp 16 and the ring 20 secured to the housing 10, a peripheral flange 24d directed towards the housing 10, a radial annular rib 24e extending towards the interior from an intermediate region of the rim, and an annular surface forming a collar 24f projecting vertically inwardly from the end edge of the rim 24d over a greater extent than the rib 24e. A first groove 24g is defined between the rib 24e and the bottom of the windscreen and is capable of receiving, during the mounting of said windscreen on the ring 20, the end bead 20e of the latter, for locking purposes. In addition, during this mounting, the respective internal free ends of the rib 24e and the re-entrant collar 24f, which define between them a second groove, come respectively to be applied elastically against the cylindrical surfaces 20d and 20c of the ring 20 when the windscreen is put in place. In this way, an annular channel 28 which extends over 360 ° at the periphery of said cup is defined, in part by the windscreen 24 and in part by the ring 20.

Une ouverture 30 est prévue dans la région supé­rieure de la bonnette 24 pour mettre en communication l'ex­trémité haute du canal annulaire 28 avec l'espace intérieur du projecteur. Cette ouverture présente la forme combinée d'une rupture de la nervure 24e et d'un décrochement vers l'arrière 24g formé dans le fond 24b de la bonnette, qui permet à l'air de contourner par l'arrière le bourrelet d'extrémité postérieure 20c de la bague 20.An opening 30 is provided in the upper region of the windscreen 24 to put the upper end of the annular channel 28 into communication with the interior space of the projector. This opening has the combined form of a rupture of the rib 24e and a recess towards the rear 24g formed in the bottom 24b of the windscreen, which allows air to bypass the end bead from the rear. posterior 20c of the ring 20.

Dans sa partie inférieure, le canal annulaire 28 est mis en communication avec l'extérieur par l'inter­médiaire de deux ouvertures traversantes 26a, 26b en for­me de fentes pratiquées dans le rebord 24d de la bonnette 24 et s'étendant alignées l'une avec l'autre dans la direc­tion circonférentielle de cette dernière. Les deux fentes sont disposées symétriquement de part et d'autre du plan vertical axial de la bonnette et, entre celles-ci, la paroi inférieure du canal 28 adopte un profil en dôme comme in­diqué en 28a, afin d'éviter les accumulations d'eau dans cette région.In its lower part, the annular channel 28 is placed in communication with the outside by means of two through openings 26a, 26b in the form of slots formed in the rim 24d of the windscreen 24 and extending aligned one with the other in the circumferential direction of the latter. The two slots are arranged symmetrically on either side of the axial vertical plane of the windscreen and, between them, the bottom wall of the channel 28 adopts a dome profile as indicated in 28a, in order to avoid the accumulation of water in this region.

A titre indicatif, les fentes pourront avoir une largeur de l'ordre de 2 à 4 mm et une longueur de l'ordre de 10 à 20 mm, en étant espacées l'une de l'autre d'environ 5 à 10 mm, ces valeurs permettant d'atteindre les objectifs évoqués plus haut en matière de résistance à l'obstruction par film capillaire et/ou par projection de boue. Mais il est bien entendu que l'on pourra également prévoir une seule ouverture en forme de fente, ou au contraire plus de deux ouvertures.As an indication, the slots may have a width of the order of 2 to 4 mm and a length of the order of 10 to 20 mm, being spaced apart from each other by approximately 5 to 10 mm, these values making it possible to achieve the objectives mentioned above in terms of resistance to obstruction by capillary film and / or by spraying of mud. But it is understood that one can also provide a single opening in the form of a slot, or on the contrary more than two openings.

Afin d'éviter d'une part, le ruissellement de l'eau depuis la surface extérieure du projecteur vers les ouvertu­res 26a, 26b, un tel ruissellement risquant d'obstruer ces dernières par formation d'un film capillaire stable s'il est trop abondant, et d'autre part, l'entrée dans le canal 28 de gouttelettes d'eau ou de boue projetées à vitesse élevée vers les ouvertures 26a, 26b dans une direction essentiellement tangente à la bonnette, on a prévu deux murets latéraux 29a, 29b, formés de préférence d'un seul tenant avec la bonnette, qui font saillie vers le bas à partir de celle-ci en encadrant les deux ouvertures 26a, 26b. Il est clair, notamment à partir de la figure 2, que ces deux murets protègent les ouvertures 26a, 26b à la fois contre le ruissellement et contre les pro­jections tangentielles.In order to avoid, on the one hand, the runoff of water from the exterior surface of the projector towards the openings 26a, 26b, such runoff running the risk of obstructing the latter by the formation of a stable capillary film if it is too abundant, and on the other hand, the entry into the channel 28 of water or mud droplets projected at high speed towards the openings 26a, 26b in a direction essentially tangent to the windscreen, two lateral walls 29a have been provided, 29b, preferably formed in one piece with the windshield, which protrude downwards therefrom by framing the two openings 26a, 26b. It is clear, in particular from FIG. 2, that these two walls protect the openings 26a, 26b both against runoff and against tangential projections.

Les murets 29a, 29b auront avantageusement une hau­teur de l'ordre de 5 à 10 mm.The walls 29a, 29b will advantageously have a height of the order of 5 to 10 mm.

On réalise ainsi un projecteur dont l'espace intérieur, normalement fermé de manière relativement étan­che, est mis en communication avec l'extérieur par un canal de ventilation annulaire en empêchant toute matière étrangère de pénétrer dans le projecteur.A projector is thus produced, the interior space of which, normally closed in a relatively sealed manner, is placed in communication with the exterior by an annular ventilation channel while preventing any foreign material from entering the projector.

En outre, la forme et la disposition des ouver­tures 26a, 26b débouchant sur l'extérieur permettant d'as­surer simultanément et dans de bonnes conditions la sortie de l'eau qui s'est condensée sur les parois du canal au niveau des bords extérieurs des deux fentes, et la sortie et l'entrée de l'air, à travers la partie centrale restan­te desdites fentes.In addition, the shape and arrangement of the openings 26a, 26b opening onto the outside, ensuring simultaneously and under good conditions the exit of the water which has condensed on the walls of the channel at the outer edges of the two slots, and the air outlet and inlet, through the remaining central part of said slots.

En outre, on peut améliorer encore la protection des ouvertures 26 à 26b en prévoyant, comme l'illustre la figure 4, un écran 31 s'étendant entre les bords d'extré­mité inférieure des deux murets 29a, 29b, en regard des ouvertures 26a, 26b et à une certaine distance de celles-­ci, par exemple à une distance de l'ordre de 5 à 10 mm. On évite ainsi également les risques d'obstruction des ou­vertures par projection de boue directement sur celles-ci du bas vers le haut. Un montant médian 32 permet d'éviter que l'écran 31 ne vienne se plaquer contre les ouvertures et faire obstacle à une bonne ventilation.In addition, the protection of the openings 26 to 26b can be further improved by providing, as illustrated in FIG. 4, a screen 31 extending between the lower end edges of the two walls 29a, 29b, facing the openings 26a. , 26b and at a certain distance therefrom, for example at a distance of the order of 5 to 10 mm. This also avoids the risk of obstruction of the openings by spraying mud directly onto them from bottom to top. A median upright 32 makes it possible to prevent the screen 31 from pressing against the openings and obstructing good ventilation.

De façon préférée, quelle que soit la forme de réalisation envisagée, la bonnette 24 sera réalisée en un caoutchouc synthétique chargé d'un matériau hydrophobe. La tendance à la formation de films d'eau susceptibles de recouvrir la ou les ouvertures de communication avec l'ex­térieur est ainsie encore réduite. L'eau se condense alors sous forme de très fines gouttelettes qui glissent facilement sur les parois du canal et de la ou des ouvertures pour se décharger vers l'extérieur.Preferably, whatever the embodiment envisaged, the windscreen 24 will be made of synthetic rubber loaded with a hydrophobic material. The tendency to form films of water capable of covering the opening or openings for communication with the outside is thus further reduced. The water then condenses in the form of very fine droplets which slide easily on the walls of the channel and the opening (s) to discharge outwards.

En outre, et comme on l'a évoqué plus haut, on peut indiquer que des résultats satisfaisants, notamment en ce qui concerne la rapidité d'élimination de la conden­sation à l'intérieur du projecteur seront obtenus avec un canal de ventilation 28 ayant une section de l'ordre de 6 à 10 mm².In addition, and as mentioned above, it can be indicated that satisfactory results, in particular with regard to the speed of elimination of the condensation inside the projector will be obtained with a ventilation channel 28 having a section of the order of 6 to 10 mm².

Bien entendu, la présente invention n'est nulle­ment limitée aux formes de réalisation décrites ci-dessus et représentées sur les dessins, mais toute variante ou modification venant à l'esprit de l'homme de l'art pourra y être apportée sans sortir de son cadre.Of course, the present invention is in no way limited to the embodiments described above and shown in the drawings, but any variant or modification coming to the mind of those skilled in the art may be made without departing from its frame.

Claims (9)

1. Projecteur de véhicule automobile, du type com­prenant un boîtier (10) et une glace de fermeture (12) définissant un espace intérieur, une bonnette (24) fer­mant le boîtier dans sa région postérieure, une lampe (16) et un réflecteur situés dans l'espace intérieur, et des moyens de ventilation de l'espace intérieur sous la forme d'un canal annulaire (28) ouvert sur l'espace intérieur du projecteur dans sa région supérieure et ouvert sur l'extérieur dans sa région inférieure, caractérisé en ce que le canal (28) est défini par une gorge à la surface intérieure d'un rebord périphérique axial de ladite bon­nette et est ouvert sur l'extérieur par au moins une ouver­ture en forme de fente (26a, 26b) formée dans ledit rebord dans une direction circonférentielle et en ce que sont formés, de part d'autre de la ou des ouvertures dans ladite direction circonférentielle, et transversalement à celles-­ci, deux murets (29a, 29b) en saillie vers le bas à partir dudit rebord.1. Motor vehicle headlamp, of the type comprising a housing (10) and a closing glass (12) defining an interior space, a windscreen (24) closing the housing in its rear region, a lamp (16) and a reflector situated in the interior space, and means for ventilating the interior space in the form of an annular channel (28) open on the interior space of the projector in its upper region and open to the exterior in its lower region, characterized in that the channel (28) is defined by a groove on the inner surface of an axial peripheral rim of said windscreen and is open to the outside by at least one slot-shaped opening (26a, 26b) formed in said flange in a circumferential direction and in that there are formed, on either side of the opening (s) in said circumferential direction, and transversely to these, two walls (29a, 29b) projecting downward from said flange. 2. Projecteur selon la revendication 1, caractérisé en ce que la gorge définissant le canal annulaire (28) est formée entre une nervure annulaire (24e) et un collet annu­laire d'extrémité (24f) qui font saillie vers l'intérieur à partir du rebord périphérique (24d) de la bonnette et qui viennent en appui contre une bague intérieure rigide essen­tiellement cylindrique (20) fixée au boîtier.2. Projector according to claim 1, characterized in that the groove defining the annular channel (28) is formed between an annular rib (24e) and an annular end collar (24f) which project inwards from the peripheral rim (24d) of the windscreen and which come to bear against a rigid, essentially cylindrical inner ring (20) fixed to the housing. 3. Projecteur selon l'une des revendications 1 et 2, caractérisé en ce que les ouvertures en forme de fente (26a, 26b) sont au nombre de deux et sont disposées symétri­quement de part et d'autre d'un plan vertical axial de la bonnette (24).3. Projector according to one of claims 1 and 2, characterized in that the slot-shaped openings (26a, 26b) are two in number and are arranged symmetrically on either side of an axial vertical plane of the windscreen (24). 4. Projecteur selon la revendication 3, caractérisé en ce que les ouvertures en forme de fente ont une longueur comprise entre 10 et 20 mm, une largeur comprise entre 2 et 4 mm et sont séparées l'une de l'autre en direction circon­férentielle d'une distance comprise entre 5 et 10 mm.4. Projector according to claim 3, characterized in that the slot-shaped openings have a length between 10 and 20 mm, a width between 2 and 4 mm and are separated from each other in the circumferential direction d '' a distance between 5 and 10 mm. 5. Projecteur selon la revendication 4, caractérisé en ce que le canal annulaire (28) présente entre les deux ouvertures un profil en forme de dôme (28a).5. Projector according to claim 4, characterized in that the annular channel (28) has between the two openings a dome-shaped profile (28a). 6. Projecteur selon l'une des revendications 1 à 5, caractérisé en ce que les murets (29a, 29b) ont une hauteur comprise entre 5 et 10 mm.6. Projector according to one of claims 1 to 5, characterized in that the walls (29a, 29b) have a height between 5 and 10 mm. 7. Projecteur selon l'une des revendications 1 à 6, caractérisé en ce qu'un écran (31) s'étend en regard des ouvertures en forme de fente (26a, 26b) entre les bords d'extrémité inférieure des deux murets.7. Projector according to one of claims 1 to 6, characterized in that a screen (31) extends opposite the slot-shaped openings (26a, 26b) between the lower end edges of the two walls. 8. Projecteur selon l'une des revendications 1 à 7, caractérisé en ce que le canal annulaire a une surface de section transversale comprise entre 6 et 10 mm.²8. Projector according to one of claims 1 to 7, characterized in that the annular channel has a cross-sectional area between 6 and 10 mm.² 9. Bonnette de fermeture arrière pour projecteur de véhicule automobile, du type comprenant une partie circu­laire et un rebord périphérique axial, caractérisée en ce qu'une gorge (28) est formée à la surface intérieure dudit rebord et est ouverte sur l'extérieur dans sa région in­férieure par au moins une ouverture en forme de fente (26a, 26b) formée dans ledit rebord dans une direction cir­conférentielle, la gorge étant ainsi susceptible de définir un canal annulaire de ventilation du projecteur lorsque la bonnette est mise en place sur ce dernier, et en ce que sont formés, de part et d'autre de la ou des ouvertures dans la­dite direction circonférentielle, transversalement à celles-­ci, deux murets (29a, 29b) en saillie vers le bas à partir dudit rebord.9. Rear closure cup for a motor vehicle headlamp, of the type comprising a circular part and an axial peripheral rim, characterized in that a groove (28) is formed on the inner surface of said rim and is open to the outside in its lower region by at least one slot-shaped opening (26a, 26b) formed in said rim in a circumferential direction, the groove being thus capable of defining an annular ventilation channel of the projector when the windshield is placed on the latter , and in that there are formed, on either side of the opening or openings in said circumferential direction, transversely to these, two walls (29a, 29b) projecting downward from said flange.
EP88400047A 1987-01-13 1988-01-11 Motor vehicle headlamp comprising ventilation means Expired - Lifetime EP0277850B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8700265A FR2609526B1 (en) 1987-01-13 1987-01-13 MOTOR VEHICLE PROJECTOR COMPRISING VENTILATION MEANS
FR8700265 1987-01-13

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EP0277850A1 true EP0277850A1 (en) 1988-08-10
EP0277850B1 EP0277850B1 (en) 1990-11-14

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EP88400047A Expired - Lifetime EP0277850B1 (en) 1987-01-13 1988-01-11 Motor vehicle headlamp comprising ventilation means

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EP (1) EP0277850B1 (en)
DE (1) DE3861024D1 (en)
ES (1) ES2018612B3 (en)
FR (1) FR2609526B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0384968A1 (en) * 1989-03-01 1990-09-05 HUGO SCHNIPPERING GMBH &amp; CO. KG. Lamp mounting for motor vehicles
GB2304881A (en) * 1995-09-06 1997-03-26 Koito Mfg Co Ltd Sealing for vehicle lamps
CN101839408A (en) * 2010-03-25 2010-09-22 谢汉松 Ventilating lamp
CN102537685A (en) * 2010-12-09 2012-07-04 海洋王照明科技股份有限公司 Lamp

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2639587B1 (en) * 1988-11-29 1993-12-31 Cibie Projecteurs PROTECTIVE COVER, PARTICULARLY FOR MOTOR VEHICLE PROJECTOR
FR2669992A1 (en) * 1990-11-30 1992-06-05 Valeo Vision Device for protecting a system for ventilating a lighting or signalling apparatus, more particularly for motor vehicles

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1105617A (en) * 1965-12-28 1968-03-06 Stadium Ltd Improvements in or relating to lamps
DE2416162A1 (en) * 1974-04-03 1975-10-23 Westfaelische Metall Industrie Housing for motor vehicles headlight - is sealed at rear of reflector and has water outlet hole below air inlet hole

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1105617A (en) * 1965-12-28 1968-03-06 Stadium Ltd Improvements in or relating to lamps
DE2416162A1 (en) * 1974-04-03 1975-10-23 Westfaelische Metall Industrie Housing for motor vehicles headlight - is sealed at rear of reflector and has water outlet hole below air inlet hole

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0384968A1 (en) * 1989-03-01 1990-09-05 HUGO SCHNIPPERING GMBH &amp; CO. KG. Lamp mounting for motor vehicles
GB2304881A (en) * 1995-09-06 1997-03-26 Koito Mfg Co Ltd Sealing for vehicle lamps
GB2304881B (en) * 1995-09-06 1997-09-03 Koito Mfg Co Ltd Automotive lamps
US6241936B1 (en) 1995-09-06 2001-06-05 Koito Manufacturing Co., Ltd. Method of forming a gasket for automotive lamps
CN101839408A (en) * 2010-03-25 2010-09-22 谢汉松 Ventilating lamp
CN102537685A (en) * 2010-12-09 2012-07-04 海洋王照明科技股份有限公司 Lamp

Also Published As

Publication number Publication date
EP0277850B1 (en) 1990-11-14
DE3861024D1 (en) 1990-12-20
FR2609526B1 (en) 1991-05-17
FR2609526A1 (en) 1988-07-15
ES2018612B3 (en) 1991-04-16

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