EP2607784B1 - Headlamp with means for air guidance within the headlamp housing - Google Patents

Headlamp with means for air guidance within the headlamp housing Download PDF

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Publication number
EP2607784B1
EP2607784B1 EP12191395.8A EP12191395A EP2607784B1 EP 2607784 B1 EP2607784 B1 EP 2607784B1 EP 12191395 A EP12191395 A EP 12191395A EP 2607784 B1 EP2607784 B1 EP 2607784B1
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EP
European Patent Office
Prior art keywords
headlight
air
hollow body
air outlet
component
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.)
Active
Application number
EP12191395.8A
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German (de)
French (fr)
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EP2607784A1 (en
Inventor
Andres Fähnle
Alexander Müller
Marc Weber
Peter Jauernig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli Automotive Lighting Reutlingen Germany GmbH
Original Assignee
Automotive Lighting Reutlingen GmbH
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Application filed by Automotive Lighting Reutlingen GmbH filed Critical Automotive Lighting Reutlingen GmbH
Publication of EP2607784A1 publication Critical patent/EP2607784A1/en
Application granted granted Critical
Publication of EP2607784B1 publication Critical patent/EP2607784B1/en
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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
    • 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
    • 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
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/43—Forced cooling using gas

Definitions

  • the present invention relates to a headlight for motor vehicles according to the preamble of claim 1.
  • Such a headlight is from the DE 101 35 849 A1 known.
  • Another headlamp with a dimensionally stable hollow body is made FR 2 946 730 Al known.
  • a fogged cover should be dried after a certain distance of the vehicle again. at the known headlights this is realized by ventilation and vents on the headlight. The difference in pressure between these openings during driving ensures that the air in the headlight is exchanged and thus the moisture is removed. The removal of the moisture is essentially influenced by the amount and speed of the air that meets or flows past the cover.
  • the amount and speed of the air flowing through the headlight also influences the dissipation of heat from the headlight, which is particularly important in the case of headlights with semiconductor light sources.
  • semiconductor light sources generally have metallic heat sinks that absorb heat released during operation of the semiconductor light sources in the semiconductor material and release it to the air in the headlight.
  • Headlights are used in modern motor vehicles as the appearance of the motor vehicle mit Weggende design elements. For this purpose, they have lying inside the housing cover elements, for example, hide technical elements of a light-generating assembly, which should not be visible from the outside hide. In this case, gaps occur between the cover elements and parts of the assemblies that are not to be concealed, in particular light exit surfaces of lenses and / or reflectors. Due to design specifications, such gaps are also being increasingly narrowed. The cover elements themselves and narrow designs remaining gap between the cover and the rest of the headlight inventory affect the flow of air within the headlight and thus a removal of moisture and / or heat from the headlight.
  • the object of the invention is to provide a headlamp of the type mentioned, which allows improved air exchange even at critical points in the interior of the housing.
  • the invention allows a targeted guidance of the headlamps flowing through the air flowing in the interior of the housing surfaces and / or areas, be it an inner surface of the transparent cover, a surface of a heat sink or another Area of the interior of the housing from which moisture and / or heat is dissipated.
  • a dimensionally stable hollow body also permits a distribution of the air flowing through the hollow body to a plurality of air outlets of the hollow body and thus to a plurality of locations within the housing.
  • a cover of several, distributed over the length of the cover air outlets are flown, which allows a targeted distribution of the air flowing to the cover.
  • the hollow body with its air inlets and its air outlets in the headlamp in a stable position and thus stable direction specification for the outflowing air in the housing can be arranged.
  • the high inherent rigidity also allows a molding of mounting geometries, the one position accurate and little positioning required requiring attachment of the hollow body in the housing.
  • the inherent rigidity and dimensional stability also allows a nozzle-like design of an air outlet of the hollow body.
  • the air can be targeted to predetermined areas, e.g. certain areas of the cover are steered
  • a preferred embodiment is characterized in that the ventilation opening is arranged on a different outer surface of the headlight than the vent opening.
  • the dimensionally stable hollow body is produced by thermoforming of plastic with a two-plate forming (Twin Sheet Forming).
  • the hollow body has fastening elements which are integrally formed on the hollow body and adapted to be connected by fastening types such as screws, clamps, clips, or clipping with the housing of the headlamp and / or the inventory of the headlamp to the To attach hollow body.
  • the dimensionally stable hollow body consists of a solid plastic such as polypropylene.
  • the dimensionally stable hollow body has at least one further air outlet between its air inlet and an air outlet which is farthest from the air inlet in relation to the air flowing in the hollow body.
  • leading to the outflow sections of the dimensionally stable hollow body have a uniform cross section over its length, or even have a nozzle-like narrowing cross-section, or that they have a Venturi nozzle-like widening cross-section.
  • the dimensionally stable hollow body is realized as a one-piece and thus cohesively coherent component.
  • the dimensionally stable hollow body is composed of a plurality of individual parts, in particular of a first component and a second component.
  • the first component has the air inlet and a first air outlet and that the second component has at least one second air outlet.
  • both components are connected to one another via a plug connection, in particular a plug connection, which is designed such that it has an open flow cross-section in the interface between the first component and the second component.
  • a further preferred embodiment is characterized in that the hollow body has at least one cooling air outlet which is arranged so that air flowing out there at least flows against a component to be cooled within the headlight 20.
  • the component to be cooled is a heat sink of a semiconductor light source of the headlight and / or a control unit of the headlight.
  • FIG. 1 shows in detail a known headlight 1 in a front view, ie from a direction which is directed opposite to the main emission of the headlight 1.
  • FIG. 2 shows a sectional view of this headlight.
  • the known headlight 1 has a ventilation opening 2 in a lower part of its housing 3 and a vent 4 in an upper part his housing 3 on.
  • the terms below and above refer to an orientation and arrangement of the headlamp when used as intended in a motor vehicle, so that the lower part of a road closer part of the housing of the headlamp 1 represents.
  • the orientation of the headlight 1 in the room in its intended use is illustrated by the specification of the x, y and z directions.
  • the x-direction is aligned parallel to a longitudinal axis of the motor vehicle, while the y-direction is parallel to a transverse axis and the z-direction is aligned parallel to a vertical axis of the motor vehicle.
  • This also applies analogously to the other figures, in which these directions are indicated, so that these directions each allow a reference between the different directions of view, from which the objects are considered in the various figures.
  • the volume of the interior of the housing 3 is divided by a flat cover 5 into two sub-volumes 6, 7.
  • a second partial volume 7 is located between the flat cover 5 and the rear wall 9 of the housing 3.
  • the planar cover has an outer edge 10 which fits closely to the cover 8 is present, so that between the cover 8 and the cover 5, only a narrow air gap is present.
  • the cover 5 has a central opening in or behind which a reflector 11 is arranged.
  • the function of the flat cover 5 is the technical structures arranged in the second partial volume of the headlamp inventory to hide from an outside observer, so that the appearance of the headlamp is just not marked by the technical inventory.
  • the outgoing light from the reflector 10 of a reflector 10 arranged in the light source 11 passes through the transparent cover 8 from the headlight 1 from.
  • the flat cover 5 in the vicinity of the ventilation opening 2, which is located in the lower part of the headlight housing 3, air inlet openings 13.
  • the planar cover of the vent opening 4 which is located in an upper part of the headlight housing 3, air outlet openings 14.
  • An alternative to a blower is to pneumatically couple the air inlet openings 13 and / or air outlet openings 14 via hoses or pipes to areas of the body in which an overpressure or a more or less pronounced negative pressure inevitably occurs during driving.
  • the air flows approximately in the direction of a diagonal within the first part volume 6 along the cover plate 8, the diagonal of the air inlet openings 13 right down to the air outlet openings 14 in the upper left in the FIG. 1 runs.
  • a condensate that has formed in the lower left corner, carried much slower out of the headlight 2 as a condensate, which has formed in the lower right corner.
  • FIG. 3 shows elements of an embodiment of a headlamp 20 according to the invention in a schematic form and in a perspective view.
  • the headlamp 20 has a housing 22 with a light exit opening.
  • the light exit opening is in the FIG. 3 the area bounded by edges 24, 26, 28 and 30 and is covered by a transparent cover.
  • the housing 22 has at least one ventilation opening 34 and a vent opening 36.
  • the vent 34 is preferably located further down than the vent 36 to create a chimney effect.
  • the ventilation opening 34 is moreover preferably arranged on another outer surface of the headlamp 20, as the vent opening 36. If one of the two openings 34 and 36 is arranged relatively far forward, the other of the two Openings preferably arranged relatively far back. It is also preferable that one opening is located far to the right and the other opening is located far to the left in the housing of the headlamp 20.
  • the conducting means in particular have a dimensionally stable hollow body 38.
  • the hollow body 38 has an air inlet 40 and at least one air outlet 42 and a dimensionally stable line section 44 lying between the air inlet 40 and the at least one air outlet 42.
  • the hollow body 38 is preferably arranged within the housing so that its air inlet 40 at the ventilation opening 34 in the housing 22 is applied so that via the ventilation opening into the housing 22 incoming air via the air inlet 40 of the dimensionally stable hollow body 38 enters into this.
  • the hollow body 38 rests with its air inlet 40 close to the edges of the ventilation opening 34 in the housing 22 of the headlamp 20, so that between the ventilation opening 34 in the housing 22 and the air inlet 40 of the hollow body 38 no pressure loss or vacuum loss, due to leakage air.
  • the air inlet 40 and the ventilation opening 34 are configured and arranged so that all of the above Vent opening 34 enters the interior of the headlight 20 entering air through the air inlet 40 into the dimensionally stable hollow body 38.
  • air 46 which enters the dimensionally stable hollow body 38 via the air inlet 40, flows to an air outlet of the hollow body 38, for example to the air outlet 42.
  • the air outlet 42 is located, for example, at a location which is without a special outlet Air flow would not or only to a small extent with air 46 would be flowed. This is, for example, a corner area located inside the housing 22 in the vicinity of the cover disk. The flow of air through the air outlet 42 in this region considerably improves the air exchange taking place there, and thus in particular also the removal of condensed moisture.
  • the dimensionally stable hollow body 38 has three air outlets 42, 48 and 50. These three air outlets are preferably arranged in a lower region of the headlamp 20 such that the air flow 46 exiting from them impinges on the cover plate, is deflected up there and brushes along the cover plate first further upwards and then to the vent opening 36 of the housing 22 to be led. The air flow then exits through the vent opening 36 from the headlight 20.
  • the air flow 46 in the interior of the housing 22 condensed moisture and transports it via the vent opening 36 from the headlight 20 out.
  • the dimensionally stable hollow body 38 is produced in a preferred embodiment by thermal deformation of plastic.
  • the so-called twin-sheet forming two-plate molding
  • This has the advantage of extensive design freedom of the geometry of the dimensionally stable hollow body 38 and its fastening elements 51st
  • Such fasteners 51 are preferably integrally formed on the hollow body 38 and adapted to be connected by fastening types such as screws, clamps, clips, clipping and so on to the housing 22 of the headlamp 20 and / or the inventory of the headlamp to the hollow body 38th to fix.
  • the term "inventory” means any component which is arranged within the housing 22 of the headlight 20.
  • These components include in particular technical structures for the realization of a variety of light functions, ie in particular the required optical elements, be it light sources, reflectors, optical fibers, transparent optical attachments (internal total reflections using optical elements) or lenses (optical refractive optical elements) and the required Holder and possibly also drive structures.
  • the inventory of modern headlamps includes structures that deliberately shape the appearance of the headlamp. These include in particular structures such as the flat cover 5 in the Figures 1 and 2 that serve to an outsider Observers to hide the underlying technical structures.
  • the entire inventory of such a headlamp is not shown except for the dimensionally stable hollow body 38. In the case of real headlamps, this inventory is of course always present and the dimensionally stable hollow body 38 then represents only one more element of the headlamp inventory.
  • the twin-sheet forming allows, for example, a very variable design of the course and the cross section of the dimensionally stable hollow body 38 in its arrangement between the surrounding it in the installed state other elements of the headlamp inventory.
  • a material for the dimensionally stable hollow body 38 a solid plastic such as polypropylene is used in a preferred embodiment.
  • the dimensionally stable hollow body has at least one further air outlet 48 and / or 50 and / or optionally also more than two further air outlet 42 between its air inlet 40 and air flowing in the hollow body 38 farthest from the air inlet 40 Air outlets 48, 50 on.
  • a more uniform distribution of the air flowing out of the hollow body 38 is achieved, as would be the case if the hollow body 38 had only a single air outlet 42.
  • This configuration thus allows a more uniform flow of the cover as a whole would be possible with only one air outlet.
  • the cross sections of the air outlets 42, 48, 50 depending on the configuration, different shapes are possible.
  • the outflow cross section round or has at least rounded parts of its edge.
  • the outflow cross-section is angular, in particular quadrangular, wherein the cross-section can be rectangular or square in particular. With a more rectangular design, a wider and thus more uniform air flow is achieved than with a square opening, for example.
  • the leading to the outflow sections of the dimensionally stable hollow body 38 may have a uniform over its length in cross-section, as is the case with the air outlet 50. Alternatively, however, they can also have a nozzle-like constricting cross-section, as is the case with the air outlet 48.
  • the cross-section or at least a width of the cross section may also Venturi-nozzle-like expand, as it is the air outlet 42 in the FIG.
  • hollow bodies 38 which have a plurality of air outlets, they can be equal to one another.
  • the cross sections are different from each other. This has the advantage that the air mass flows flowing out over the various cross sections can be determined in their relationship to one another by the geometry, size and arrangement of the cross sections in the design of the hollow body 38.
  • FIG. 5 shows an embodiment of a dimensionally stable hollow body 38 with a designed for a particular type of headlight individual geometry.
  • the dimensionally stable hollow body 38 has an air inlet 40 and a first air outlet 42A and a second Air outlet 42B on.
  • the dimensionally stable hollow body has fastening geometries 51A, 51B and 51C.
  • the dimensionally stable hollow body 38 is realized in a preferred embodiment as a one-piece and thus cohesively connected component.
  • the dimensionally stable hollow body 38 is composed of several individual parts.
  • the FIG. 4 shows an embodiment in which the dimensionally stable hollow body of a first component 52 and a second component 54 is composed.
  • the first component 52 has the air inlet 40 and a first air outlet 42A.
  • the second component 54 has a second air outlet 42B in the illustrated embodiment.
  • both components 52, 54 are connected to one another.
  • the plug connection is designed such that it has an open flow cross-section in the interface between the first component 52 and the second component 54.
  • the ratio of the partial air flows flowing over these cross sections to one another can be predetermined.
  • the air flowing into the first component 52 via the air inlet 40 in the first component 52 is split up into a first partial flow and a second partial flow.
  • the first partial flow exits from the first air outlet 40.
  • the second partial flow flows from the first component 52 into the second component 54 and exits from the second air outlet 42B.
  • the first component 52 may also be referred to as an air distributor.
  • the second component 54 represents a dimensionally stable line section, with which a partial flow of the ventilation air is guided into a partial area in the interior of the housing 22 of the headlight 20.
  • the partial area is an area in a corner in the interior of the headlight housing 22, which is delimited by the transparent cover pane.
  • first air outlet 42A flows against a first lower corner portion of the cover disk inside the housing 22, while the second air outlet 42B flows against the remaining other lower corner portion of the cover disk inside the housing 22.
  • FIG. 5 shows an alternative embodiment of a dimensionally stable hollow body 38 with a designed for a different type of headlight individual geometry.
  • the object of FIG. 5 differs from the subject of FIG. 4 by an additional third air outlet 42D and a fourth air outlet 42C, which are arranged distributed along the length of the dimensionally stable hollow body 38 between the first air outlet 42A and the second air outlet 42B.
  • the two differ in the FIGS. 4 and 5 not shown embodiments of dimensionally stable hollow body 38 in their geometry. So they are particularly useful in the same headlight housing.
  • the generated in the FIG. 5 illustrated embodiment a more uniform distribution of the ventilation air over the length of the hollow body 38 and thus also over the dimensions of the transparent cover, which is flowed with this air flow.
  • FIGS. 4 and 5 offer advantages in a particular case depends on the circumstances of the case.
  • the design after FIG. 4 has advantages in cases in which condensate is deposited preferentially in the corners.
  • the design after FIG. 5 has advantages if the condensate precipitation occurs more evenly distributed.
  • a comparison of FIGS. 4 and 5 illustrates an advantage of a multi-part design of the dimensionally stable hollow body 38. Both in the embodiment of the FIG. 4 as well as in the embodiment of the FIG. 5 the same air distributor, so the same component 52 is used, so that an adaptation to the requirements of different headlights can be done by a limited to the second component 54 individualization.
  • FIG. 6 shows the dimensionally stable hollow body 38 from the FIG. 5 in a specific embodiment of a headlight.
  • FIG. 6 shows in particular the high packing density in the interior of the housing 22 of the headlamp 20, which also results from the deliberately designed appearance of the headlamp 20 and the structures used for this purpose in the interior of the housing 22 of the headlamp 20.
  • the packing density is also due to the large number of light functions and the optical elements required for it, be it light sources, reflectors, optical fibers, attachment optics or lenses, or be it necessary holder and possibly also necessary drive structures.
  • Drive structures are required, for example, for a headlight range control, an aperture adjustment and / or a cornering light function. These structures are today usually hidden behind decorative frames, screens and the like. There are, among other things, these decorative frames and panels that complicate air circulation inside the housing 22 and thus an effective removal of condensate from the inside of the cover 8.
  • FIG. 6 illustrated by their sectional view that, in particular, if only narrow air gaps 56 between the various components, in particular different decorative frame and cover frame inside the Housing 22 are present, the invention allows a very targeted flow of this column 56, so that despite the narrowness of such a gap 56 still directed to the cover 8 preferred direction of the ventilation air inside the headlight housing 22 is generated.
  • FIG. 6 also illustrates that an elongate elongate shape of the air outlet cross-section of an air outlet 42C is favorable for flow of the gap 56.
  • the flow resistance which must overcome the air during the flow of the column 56, minimized.
  • Fig. 7 shows an embodiment which is characterized in that the hollow body 38 has a cooling air outlet 58 which is arranged so that there flowing out of air 46 flows to a component 60 to be cooled within the headlamp 20.
  • the component to be cooled is a heat sink 62 of a semiconductor light source 64, which is fastened to a circuit carrier 66 and electrically supplied and controlled via the circuit carrier, wherein the circuit carrier is in turn thermally coupled to the heat sink, so that the heat released in the semiconductor light source electrical heat loss is absorbed by the heat sink.
  • the component to be cooled is a control device of the headlight 20, with which the light source and / or a or multiple drives of the headlamp are controlled.
  • Such drives are present in modern headlamps for varying positions of apertures, for pivoting a light module to the right and left, and for pivoting a light module up and down.
  • the change of the diaphragm position is done to change a light distribution, for example, to switch between a high beam light distribution and a low beam light distribution.
  • the pivoting to the right and to the left is to achieve a cornering light function and the pivoting up and down to realize a headlight range control.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Description

Die vorliegende Erfindung betrifft einen Scheinwerfer für Kraftfahrzeuge nach dem Oberbegriff des Anspruchs 1.The present invention relates to a headlight for motor vehicles according to the preamble of claim 1.

Ein solcher Scheinwerfer ist aus der DE 101 35 849 A1 bekannt. Ein weiterer Scheinwerfer mit einem formstabilen Hohlkörper ist aus FR 2 946 730 Al bekannt.Such a headlight is from the DE 101 35 849 A1 known. Another headlamp with a dimensionally stable hollow body is made FR 2 946 730 Al known.

Unter gewissen klimatischen Bedingungen kommt es vor, dass die Abdeckscheibe des Scheinwerfers von innen beschlägt. Dies geschieht vor allem beim Abkühlen nach dem Betrieb des Scheinwerfers, wenn die Feuchtigkeit der zunächst noch warmen Luft innerhalb des Scheinwerfers an der kühler werdenden Abdeckscheibe kondensiert. Das Kondensat beeinträchtigt das Erscheinungsbild und die Transmission der Abdeckscheibe im nachfolgenden Betrieb.Under certain climatic conditions, it happens that the cover of the headlight misted from the inside. This happens especially when cooling after the operation of the headlamp, when the moisture of the initially still warm air condenses within the headlight on the cooler becoming cover. The condensate affects the appearance and the transmission of the cover in subsequent operation.

Eine beschlagene Abdeckscheibe soll nach einer gewissen Fahrstrecke des Fahrzeugs wieder abgetrocknet sein. Bei dem bekannten Scheinwerfer wird dies durch Belüftungs- und Entlüftungsöffnungen am Scheinwerfer realisiert. Der im Fahrbetrieb entstehende Differenzdruck zwischen den genannten Öffnungen sorgt dafür, dass die Luft im Scheinwerfer ausgetauscht und somit die Feuchtigkeit abtransportiert wird. Der Abtransport der Feuchtigkeit wird im Wesentlichen durch die Menge und Geschwindigkeit der Luft, die auf die Abdeckscheibe trifft, bzw. dort vorbeiströmt, beeinflusst.A fogged cover should be dried after a certain distance of the vehicle again. at the known headlights this is realized by ventilation and vents on the headlight. The difference in pressure between these openings during driving ensures that the air in the headlight is exchanged and thus the moisture is removed. The removal of the moisture is essentially influenced by the amount and speed of the air that meets or flows past the cover.

Die Menge und Geschwindigkeit der den Scheinwerfer durchströmenden Luft beeinflusst darüber hinaus die Abfuhr von Wärme aus dem Scheinwerfer, was insbesondere bei Scheinwerfern mit Halbleiterlichtquellen von Bedeutung ist. Solche Halbleiterlichtquellen weisen in der Regel metallische Kühlkörper auf, die beim Betrieb der Halbleiterlichtquellen im Halbleitermaterial freiwerdende Wärme aufnehmen und an die Luft im Scheinwerfer abgeben.The amount and speed of the air flowing through the headlight also influences the dissipation of heat from the headlight, which is particularly important in the case of headlights with semiconductor light sources. Such semiconductor light sources generally have metallic heat sinks that absorb heat released during operation of the semiconductor light sources in the semiconductor material and release it to the air in the headlight.

Scheinwerfer dienen bei modernen Kraftfahrzeugen auch als das Erscheinungsbild des Kraftfahrzeugs mitprägende Designelemente. Zu diesem Zweck weisen sie im Inneren des Gehäuses liegende Abdeckelemente auf, die zum Beispiel technische Elemente einer Licht erzeugenden Baugruppe, die von außen nicht sichtbar sein sollen, verbergen. Dabei treten Spalte zwischen den Abdeckelementen und nicht zu verbergenden Teilen der Baugruppen, insbesondere Lichtaustrittsflächen von Linsen und/oder Reflektoren auf. Aufgrund gestalterischer Vorgaben werden auch solche Spalte zunehmend enger ausgeführt. Die Abdeckelemente selbst und enge Ausführungen verbleibender Spalte zwischen den Abdeckelementen und dem übrigen Scheinwerferinventar beeinträchtigen die Luftströmung innerhalb des Scheinwerfers und damit einen Abtransport von Feuchtigkeit und/oder Wärme aus dem Scheinwerfer.Headlights are used in modern motor vehicles as the appearance of the motor vehicle mitprägende design elements. For this purpose, they have lying inside the housing cover elements, for example, hide technical elements of a light-generating assembly, which should not be visible from the outside hide. In this case, gaps occur between the cover elements and parts of the assemblies that are not to be concealed, in particular light exit surfaces of lenses and / or reflectors. Due to design specifications, such gaps are also being increasingly narrowed. The cover elements themselves and narrow designs remaining gap between the cover and the rest of the headlight inventory affect the flow of air within the headlight and thus a removal of moisture and / or heat from the headlight.

Vor diesem Hintergrund besteht die Aufgabe der Erfindung darin, einen Scheinwerfer der eingangs genannten Art anzugeben, der einen verbesserten Luftaustausch auch an kritischen Stellen im Inneren des Gehäuses erlaubt.Against this background, the object of the invention is to provide a headlamp of the type mentioned, which allows improved air exchange even at critical points in the interior of the housing.

Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved with the features of claim 1.

Durch die Verwendung eines formstabilen Hohlkörpers als Mittel zur Leitung der Luft erlaubt die Erfindung eine gezielte Führung der den Scheinwerfer durchströmenden Luft an im Inneren des Gehäuses anzuströmende Flächen und/oder Bereiche, sei es eine Innenfläche der transparenten Abdeckscheibe, eine Fläche eines Kühlkörpers oder ein anderer Bereich des Innenraums des Gehäuses, aus dem Feuchtigkeit und/oder Wärme abzuführen ist.By using a dimensionally stable hollow body as a means for conducting the air, the invention allows a targeted guidance of the headlamps flowing through the air flowing in the interior of the housing surfaces and / or areas, be it an inner surface of the transparent cover, a surface of a heat sink or another Area of the interior of the housing from which moisture and / or heat is dissipated.

Die Verwendung eines formstabilen Hohlkörpers erlaubt auch eine Verteilung der durch den Hohlkörper strömenden Luft auf mehrere Luftauslässe des Hohlkörpers und damit auf mehrere Stellen innerhalb des Gehäuses. Damit kann zum Beispiel eine Abdeckscheibe aus mehreren, über die Länge der Abdeckscheibe verteilten Luftauslässen angeströmt werden, was eine gezielte Verteilung der die Abdeckscheibe anströmenden Luft erlaubt.The use of a dimensionally stable hollow body also permits a distribution of the air flowing through the hollow body to a plurality of air outlets of the hollow body and thus to a plurality of locations within the housing. Thus, for example, a cover of several, distributed over the length of the cover air outlets are flown, which allows a targeted distribution of the air flowing to the cover.

Durch die hohe Eigensteifigkeit, die das formstabile Bauteil zum Beispiel von einem handelsüblichen elastischen Schlauch unterscheidet, lässt sich der Hohlkörper mit seinen Lufteinlässen und seinen Luftauslässen im Scheinwerfer in stabiler Lage und damit stabiler Richtungsvorgabe für die ausströmende Luft im Gehäuse anordnen. Die hohe Eigensteifigkeit erlaubt darüber hinaus eine Anformung von Befestigungsgeometrien, die eine positionsgenaue und wenig Positionieraufwand erfordernde Befestigung des Hohlkörpers im Gehäuse erlauben.Due to the high inherent rigidity, which distinguishes the dimensionally stable component, for example, from a commercially available elastic hose, the hollow body with its air inlets and its air outlets in the headlamp in a stable position and thus stable direction specification for the outflowing air in the housing can be arranged. The high inherent rigidity also allows a molding of mounting geometries, the one position accurate and little positioning required requiring attachment of the hollow body in the housing.

Durch die hohe Eigensteifigkeit und die Möglichkeit der der Anformung von Befestigungsgeometrien wird darüber hinaus eine den Strömungsquerschnitt verringernde Quetschung, wie sie z.B. bei der Befestigung eines Schlauches mit einer Schlauchschelle auftreten kann, sicher vermieden. Vermieden werden auch andere Widerstände, die den Strömungswiderstand erhöhen, wie zum Beispiel Knickstellen eines elastischen Schlauches, die durch eine ungenaue Montage auftreten können.Due to the high intrinsic rigidity and the possibility of the formation of attachment geometries is also a flow cross-section reducing contusion, as e.g. can occur when attaching a hose with a hose clamp, safely avoided. Also avoided are other resistors that increase flow resistance, such as kinking of an elastic tube, which may occur due to inaccurate assembly.

Ein weiterer Vorteil der hohen Eigensteifigkeit liegt darin, dass der Querschnitt und der Verlauf des Hohlkörpers innerhalb des Gehäuses und inmitten des übrigen Scheinwerferinventars sehr variabel gestaltbar ist.Another advantage of the high inherent rigidity is that the cross section and the course of the hollow body within the housing and amid the rest of the headlamp inventory is very variable gestaltbar.

Die Eigensteifigkeit und Formstabilität erlaubt darüber hinaus eine düsenartige Ausführung eines Luftauslasses des Hohlkörpers. Damit kann die Luft gezielter an vorbestimmte Bereiche, z.B. bestimmte Bereiche der Abdeckscheibe gelenkt werdenThe inherent rigidity and dimensional stability also allows a nozzle-like design of an air outlet of the hollow body. Thus, the air can be targeted to predetermined areas, e.g. certain areas of the cover are steered

Eine bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass die Belüftungsöffnung auf einer anderen Außenfläche des Scheinwerfers angeordnet ist als die Entlüftungsöffnung.A preferred embodiment is characterized in that the ventilation opening is arranged on a different outer surface of the headlight than the vent opening.

Bevorzugt ist auch, dass der formstabile Hohlkörper durch thermisches Umformen von Kunststoff mit einem Zwei-Platten-Formen (Twin Sheet Forming) hergestellt wird.It is also preferred that the dimensionally stable hollow body is produced by thermoforming of plastic with a two-plate forming (Twin Sheet Forming).

Ferner ist bevorzugt, dass der Hohlkörper Befestigungselemente aufweist, die stoffschlüssig an den Hohlkörper angeformt und dazu eingerichtet sind, durch Befestigungsarten wie Schrauben, Klemmen, Klammern, oder Verclipsen mit dem Gehäuse des Scheinwerfers und/oder dem Inventar des Scheinwerfers verbunden zu werden, um den Hohlkörper zu befestigen.Further, it is preferred that the hollow body has fastening elements which are integrally formed on the hollow body and adapted to be connected by fastening types such as screws, clamps, clips, or clipping with the housing of the headlamp and / or the inventory of the headlamp to the To attach hollow body.

Bevorzugt ist auch, dass der formstabile Hohlkörper aus einem festen Kunststoff wie Polypropylen besteht.It is also preferred that the dimensionally stable hollow body consists of a solid plastic such as polypropylene.

Ferner ist bevorzugt, dass der formstabile Hohlkörper zwischen seinem Lufteinlass und einem in Bezug auf die im Hohlkörper strömende Luft am weitesten von dem Lufteinlass entfernten Luftauslass wenigstens einen weiteren Luftauslass aufweist.It is further preferred that the dimensionally stable hollow body has at least one further air outlet between its air inlet and an air outlet which is farthest from the air inlet in relation to the air flowing in the hollow body.

Weitere bevorzugte Ausgestaltungen zeichnen sich dadurch aus, dass die zu den Ausströmquerschnitten führenden Abschnitte des formstabilen Hohlkörpers einen über ihrer Länge gleichmäßigen Querschnitt aufweisen, oder aber auch einen sich düsenartig verengenden Querschnitt aufweisen, oder dass sie einen sich Venturi-Düsen-artig erweiternden Querschnitt aufweisen.Further preferred embodiments are characterized in that the leading to the outflow sections of the dimensionally stable hollow body have a uniform cross section over its length, or even have a nozzle-like narrowing cross-section, or that they have a Venturi nozzle-like widening cross-section.

Bevorzugt ist auch, dass der formstabile Hohlkörper als einstückiges und damit stoffschlüssig zusammenhängendes Bauteil verwirklicht ist.It is also preferred that the dimensionally stable hollow body is realized as a one-piece and thus cohesively coherent component.

Alternativ ist bevorzugt, dass der formstabile Hohlkörper aus mehreren Einzelteilen, insbesondere aus einem ersten Bauteil und einem zweiten Bauteil zusammengesetzt ist.Alternatively, it is preferred that the dimensionally stable hollow body is composed of a plurality of individual parts, in particular of a first component and a second component.

Dabei ist bevorzugt, dass das erste Bauteil den Lufteinlass und einen ersten Luftauslass aufweist und dass das zweite Bauteil wenigstens einen zweiten Luftauslass aufweist.It is preferred that the first component has the air inlet and a first air outlet and that the second component has at least one second air outlet.

Dabei ist ferner bevorzugt, dass beide Bauteile über eine Steckverbindung miteinander verbunden sind, insbesondere eine Steckverbindung, die so ausgestaltet ist, dass sie einen offenen Strömungsquerschnitt in der Schnittstelle zwischen dem ersten Bauteil und dem zweiten Bauteil aufweist.It is further preferred that both components are connected to one another via a plug connection, in particular a plug connection, which is designed such that it has an open flow cross-section in the interface between the first component and the second component.

Eine weitere bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass der Hohlkörper wenigstens einen Kühlluftauslass aufweist, der so angeordnet ist, dass dort ausströmende Luft wenigstens ein zu kühlendes Bauteil innerhalb des Scheinwerfers 20 anströmt.A further preferred embodiment is characterized in that the hollow body has at least one cooling air outlet which is arranged so that air flowing out there at least flows against a component to be cooled within the headlight 20.

Dabei ist bevorzugt, dass es sich bei dem zu kühlenden Bauteil um einen Kühlkörper einer Halbleiterlichtquelle des Scheinwerfers und/oder um ein Steuergerät des Scheinwerfers handelt.It is preferred that the component to be cooled is a heat sink of a semiconductor light source of the headlight and / or a control unit of the headlight.

Weitere Vorteile ergeben sich aus den abhängigen Ansprüchen, der Beschreibung und den beigefügten Figuren.Further advantages will be apparent from the dependent claims, the description and the attached figures.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Zeichnungendrawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Dabei zeigen, jeweils in schematischer Form:

Figur 1
das technische Umfeld der Erfindung in Form einer stark schematisierten Vorderansicht eines Kraftfahrzeugscheinwerfers;
Figur 2
eine Schnittansicht des Scheinwerfers aus der Figur 1;
Figur 3
ein stark schematisiertes Ausführungsbeispiel der Erfindung;
Figur 4
eine Ausgestaltung eines formstabilen Hohlkörpers;
Figur 5
eine weitere Ausgestaltung eines formstabilen Hohlkörpers;
Figur 6
eine perspektivische Darstellung eines aufgeschnittenen Scheinwerfers mit einem Teil des Scheinwerferinventars und einer Ausgestaltung eines formstabilen Hohlkörpers; und
Figur 7
eine Ausgestaltung eines Hohlkörpers mit einem Kühlluftauslass zum Anströmen eines zu kühlenden Bauteils innerhalb des Scheinwerfers.
Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show, each in schematic Shape:
FIG. 1
the technical environment of the invention in the form of a highly schematic front view of a motor vehicle headlight;
FIG. 2
a sectional view of the headlamp from the FIG. 1 ;
FIG. 3
a highly schematic embodiment of the invention;
FIG. 4
an embodiment of a dimensionally stable hollow body;
FIG. 5
a further embodiment of a dimensionally stable hollow body;
FIG. 6
a perspective view of a cut headlight with a part of the headlamp inventory and a configuration of a dimensionally stable hollow body; and
FIG. 7
an embodiment of a hollow body with a cooling air outlet for flow of a component to be cooled within the headlight.

Figur 1 zeigt im Einzelnen einen bekannten Scheinwerfer 1 in einer Vorderansicht, also aus einer Richtung, die der Hauptabstrahlrichtung des Scheinwerfers 1 entgegengesetzt gerichtet ist. Figur 2 zeigt eine Schnittansicht dieses Scheinwerfers. Der bekannte Scheinwerfer 1 weist eine Belüftungsöffnung 2 in einem unteren Teil seines Gehäuses 3 und eine Entlüftungsöffnung 4 in einem oberen Teil seines Gehäuses 3 auf. Die Begriffe unten und oben beziehen sich dabei auf eine Ausrichtung und Anordnung des Scheinwerfers bei seiner bestimmungsgemäßen Verwendung in einem Kraftfahrzeug, so dass der untere Teil den einer Fahrbahn näheren Teil des Gehäuses des Scheinwerfers 1 darstellt. FIG. 1 shows in detail a known headlight 1 in a front view, ie from a direction which is directed opposite to the main emission of the headlight 1. FIG. 2 shows a sectional view of this headlight. The known headlight 1 has a ventilation opening 2 in a lower part of its housing 3 and a vent 4 in an upper part his housing 3 on. The terms below and above refer to an orientation and arrangement of the headlamp when used as intended in a motor vehicle, so that the lower part of a road closer part of the housing of the headlamp 1 represents.

Die Orientierung des Scheinwerfers 1 im Raum bei seiner bestimmungsgemäßen Verwendung wird durch die Angabe der x-, y- und z-Richtungen veranschaulicht. Die x-Richtung ist parallel zu einer Längsachse des Kraftfahrzeugs ausgerichtet, während die y-Richtung parallel zu einer Querachse liegt und die z-Richtung parallel zu einer Hochachse des Kraftfahrzeugs ausgerichtet ist. Dies gilt analog auch für die weiteren Figuren, in denen diese Richtungen angegeben sind, so dass diese Richtungsangaben jeweils einen Bezug zwischen den verschiedenen Blickrichtungen erlauben, aus denen die Gegenstände in den verschiedenen Figuren betrachtet werden.The orientation of the headlight 1 in the room in its intended use is illustrated by the specification of the x, y and z directions. The x-direction is aligned parallel to a longitudinal axis of the motor vehicle, while the y-direction is parallel to a transverse axis and the z-direction is aligned parallel to a vertical axis of the motor vehicle. This also applies analogously to the other figures, in which these directions are indicated, so that these directions each allow a reference between the different directions of view, from which the objects are considered in the various figures.

Das Volumen des Innenraums des Gehäuses 3 wird durch eine flächige Abdeckung 5 in zwei Teilvolumina 6, 7 geteilt. Ein erstes Teilvolumen 6 liegt zwischen einer transparenten Abdeckscheibe 8 und der flächigen Abdeckung 5. Ein zweites Teilvolumen 7 liegt zwischen der flächigen Abdeckung 5 und der Rückwand 9 des Gehäuses 3. Die flächige Abdeckung weist einen äußeren Rand 10 auf, der eng an der Abdeckscheibe 8 anliegt, so dass zwischen der Abdeckscheibe 8 und der Abdeckung 5 lediglich ein schmaler Luftspalt vorhanden ist. Darüber hinaus weist die Abdeckung 5 eine zentrale Öffnung auf, in der oder hinter der ein Reflektor 11 angeordnet ist.The volume of the interior of the housing 3 is divided by a flat cover 5 into two sub-volumes 6, 7. A second partial volume 7 is located between the flat cover 5 and the rear wall 9 of the housing 3. The planar cover has an outer edge 10 which fits closely to the cover 8 is present, so that between the cover 8 and the cover 5, only a narrow air gap is present. In addition, the cover 5 has a central opening in or behind which a reflector 11 is arranged.

Die Funktion der flächigen Abdeckung 5 besteht darin, die im zweiten Teilvolumen angeordneten technischen Strukturen des Scheinwerferinventars vor einem außenstehenden Betrachter zu verbergen, so dass das Erscheinungsbild des Scheinwerfers gerade nicht durch das technische Inventar geprägt wird.The function of the flat cover 5 is the technical structures arranged in the second partial volume of the headlamp inventory to hide from an outside observer, so that the appearance of the headlamp is just not marked by the technical inventory.

Das vom Reflektor 10 ausgehende Lichtbündel einer im Reflektor 10 angeordneten Lichtquelle 11 tritt durch die transparente Abdeckscheibe 8 aus dem Scheinwerfer 1 aus.The outgoing light from the reflector 10 of a reflector 10 arranged in the light source 11 passes through the transparent cover 8 from the headlight 1 from.

Beim Abkühlen des warmen Scheinwerfers nach dem Ausschalten des Lichtes kommt es häufig zu einer Kondensation von Luftfeuchtigkeit auf der dem Inneren des Scheinwerfers 1 zugewandten Seite der Abdeckscheibe. In der nächsten Betriebsphase soll dieses Kondensat möglichst schnell wieder verschwinden. Dies wird durch eine Durchströmung des ersten Teilvolumens 6 mit Luft erzielt.When the warm headlamp cools down after the light has been switched off, condensation of atmospheric moisture frequently occurs on the side of the cover pane facing the interior of the headlamp 1. In the next phase of operation, this condensate should disappear again as quickly as possible. This is achieved by a flow through the first part volume 6 with air.

Um eine Durchströmung des ersten Teilvolumens 6 mit Luft zu erreichen, weist die flächige Abdeckung 5 in der Nähe der Belüftungsöffnung 2, die sich im unteren Teil des Scheinwerfergehäuses 3 befindet, Lufteinlassöffnungen 13 auf. Darüber hinaus weist die flächige Abdeckung der Entlüftungsöffnung 4, die sich in einem oberen Teil des Scheinwerfergehäuses 3 befindet, Luftauslassöffnungen 14 auf.In order to achieve a flow through the first partial volume 6 with air, the flat cover 5 in the vicinity of the ventilation opening 2, which is located in the lower part of the headlight housing 3, air inlet openings 13. In addition, the planar cover of the vent opening 4, which is located in an upper part of the headlight housing 3, air outlet openings 14.

Insbesondere bei fahrendem Fahrzeug ergeben sich in der Regel Druckdifferenzen zwischen der Belüftungsöffnung 2 und der Entlüftungsöffnung 4, beziehungsweise zwischen den Lufteinlassöffnungen 13 auf der einen Seite und den Luftaustrittsöffnungen 14 auf der anderen Seite. Es ist von den an einem konkreten Fahrzeug herrschenden aerodynamischen Bedingungen abhängig, ob ein solcher Differenzdruck entsteht und wie stark er gegebenenfalls ist. Unter Umständen ist es erforderlich, eine Druckdifferenz aktiv zu erzeugen. Dies kann durch ein Gebläse erfolgen. Eine Alternative zu einem Gebläse besteht darin, die Lufteinlassöffnungen 13 und/oder Luftauslassöffnungen 14 über Schläuche oder Rohre pneumatisch mit Bereichen der Karosserie zu koppeln, in denen sich beim Fahren zwangsläufig ein Überdruck oder ein mehr oder weniger stark ausgeprägter Unterdruck einstellt.Pressure differences between the ventilation opening 2 and the ventilation opening 4, or between the air inlet openings 13 on the one side and the air outlet openings 14 on the other side, generally arise when the vehicle is moving. It depends on the aerodynamic conditions prevailing on a specific vehicle, whether such a differential pressure arises and how much it is possibly. It may be necessary to have a To generate pressure difference active. This can be done by a blower. An alternative to a blower is to pneumatically couple the air inlet openings 13 and / or air outlet openings 14 via hoses or pipes to areas of the body in which an overpressure or a more or less pronounced negative pressure inevitably occurs during driving.

In dem Beispiel, das in den Figuren 1 und 2 dargestellt ist, strömt die Luft etwa in Richtung einer Diagonalen innerhalb des ersten Teilvolumens 6 an der Abdeckscheibe 8 entlang, wobei die Diagonale von den Lufteinlassöffnungen 13 rechts unten zu den Luftauslassöffnungen 14 links oben in der Figur 1 verläuft. Das hat zur Folge, dass der Luftaustausch längs dieser Hauptströmungsrichtung effektiver erfolgt als abseits dieser Hauptströmungsrichtung. Als Folge wird ein Kondensat, das sich in der linken unteren Ecke gebildet hat, wesentlich langsamer aus dem Scheinwerfer 2 herausgetragen, als ein Kondensat, das sich in der rechten unteren Ecke gebildet hat.In the example that is in the Figures 1 and 2 is shown, the air flows approximately in the direction of a diagonal within the first part volume 6 along the cover plate 8, the diagonal of the air inlet openings 13 right down to the air outlet openings 14 in the upper left in the FIG. 1 runs. This has the consequence that the air exchange along this main flow direction is more effective than away from this main flow direction. As a result, a condensate that has formed in the lower left corner, carried much slower out of the headlight 2, as a condensate, which has formed in the lower right corner.

Figur 3 zeigt Elemente eines Ausführungsbeispiels eines erfindungsgemäßen Scheinwerfers 20 in schematischer Form und in einer perspektivischen Darstellung. Der Scheinwerfer 20 weist ein Gehäuse 22 mit einer Lichtaustrittsöffnung auf. Die Lichtaustrittsöffnung ist in der Figur 3 die von Kanten 24, 26, 28 und 30 begrenzte Fläche und wird von einer transparenten Abdeckscheibe abgedeckt. Das Gehäuse 22 weist wenigstens eine Belüftungsöffnung 34 und eine Entlüftungsöffnung 36 auf. Die Belüftungsöffnung 34 ist bevorzugt weiter unten angeordnet als die Entlüftungsöffnung 36, um einen Kamineffekt zu erzeugen. FIG. 3 shows elements of an embodiment of a headlamp 20 according to the invention in a schematic form and in a perspective view. The headlamp 20 has a housing 22 with a light exit opening. The light exit opening is in the FIG. 3 the area bounded by edges 24, 26, 28 and 30 and is covered by a transparent cover. The housing 22 has at least one ventilation opening 34 and a vent opening 36. The vent 34 is preferably located further down than the vent 36 to create a chimney effect.

Um eine Durchströmung des gesamten Scheinwerfers zu erzielen, ist die Belüftungsöffnung 34 darüber hinaus bevorzugt auf einer anderen Außenfläche des Scheinwerfers 20 angeordnet, als die Entlüftungsöffnung 36. Wenn die eine der beiden Öffnungen 34 und 36 relativ weit vorne angeordnet ist, ist die andere der beiden Öffnungen bevorzugt relativ weit hinten angeordnet. Bevorzugt ist auch, dass die einer Öffnung weit rechts und die andere Öffnung weit links im Gehäuse des Scheinwerfers 20 angeordnet ist.In order to achieve a flow through the entire headlight, the ventilation opening 34 is moreover preferably arranged on another outer surface of the headlamp 20, as the vent opening 36. If one of the two openings 34 and 36 is arranged relatively far forward, the other of the two Openings preferably arranged relatively far back. It is also preferable that one opening is located far to the right and the other opening is located far to the left in the housing of the headlamp 20.

Darüber hinaus weist der Scheinwerfer 20 Leitmittel auf, die einen von der Belüftungsöffnung 34 zur Entlüftungsöffnung 36 innerhalb des Gehäuses 22 strömenden Luftstrom lenken. Die Leitmittel weisen insbesondere einen formstabilen Hohlkörper 38 auf. Der Hohlkörper 38 weist einen Lufteinlass 40 und wenigstens einen Luftauslass 42 sowie einen zwischen dem Lufteinlass 40 und dem wenigstens einen Luftauslass 42 liegenden formstabilen Leitungsabschnitt 44 auf. Der Hohlkörper 38 ist dabei innerhalb des Gehäuses bevorzugt so angeordnet, dass sein Lufteinlass 40 an der Belüftungsöffnung 34 im Gehäuse 22 so anliegt, dass über die Belüftungsöffnung in das Gehäuse 22 einströmende Luft über den Lufteinlass 40 des formstabilen Hohlkörpers 38 in diesen eintritt.In addition, the headlight 20 on guide means which direct a flowing from the ventilation opening 34 to the vent opening 36 within the housing 22 air flow. The conducting means in particular have a dimensionally stable hollow body 38. The hollow body 38 has an air inlet 40 and at least one air outlet 42 and a dimensionally stable line section 44 lying between the air inlet 40 and the at least one air outlet 42. The hollow body 38 is preferably arranged within the housing so that its air inlet 40 at the ventilation opening 34 in the housing 22 is applied so that via the ventilation opening into the housing 22 incoming air via the air inlet 40 of the dimensionally stable hollow body 38 enters into this.

In einer besonders bevorzugten Ausgestaltung liegt der Hohlkörper 38 mit seinem Lufteinlass 40 dicht an den Rändern der Belüftungsöffnung 34 im Gehäuse 22 des Scheinwerfers 20 an, so dass zwischen der Belüftungsöffnung 34 im Gehäuse 22 und dem Lufteinlass 40 des Hohlkörpers 38 kein Druckverlust, beziehungsweise Unterdruckverlust, durch Leckluft auftritt. Mit anderen Worten: Es ist bevorzugt, dass der Lufteinlass 40 und die Belüftungsöffnung 34 so ausgestaltet und angeordnet sind, dass sämtliche über die Belüftungsöffnung 34 in das Innere des Scheinwerfers 20 eintretende Luft über den Lufteinlass 40 in den formstabilen Hohlkörper 38 eintritt.In a particularly preferred embodiment, the hollow body 38 rests with its air inlet 40 close to the edges of the ventilation opening 34 in the housing 22 of the headlamp 20, so that between the ventilation opening 34 in the housing 22 and the air inlet 40 of the hollow body 38 no pressure loss or vacuum loss, due to leakage air. In other words, it is preferable that the air inlet 40 and the ventilation opening 34 are configured and arranged so that all of the above Vent opening 34 enters the interior of the headlight 20 entering air through the air inlet 40 into the dimensionally stable hollow body 38.

Über den formstabilen Leitungsabschnitt 44 strömt Luft 46, die über den Lufteinlass 40 in den formstabilen Hohlkörper 38 eintritt, zu einem Luftauslass des Hohlkörpers 38, zum Beispiel zu dem Luftauslass 42. Der Luftauslass 42 befindet sich zum Beispiel an einer Stelle, die ohne eine spezielle Luftführung nicht oder nur in einem geringen Ausmaß mit Luft 46 angeströmt werden würde. Dies ist zum Beispiel ein im Inneren des Gehäuses 22 in der Nähe der Abdeckscheibe liegender Eckbereich. Durch die über den Luftauslass 42 erzielte Anströmung dieses Bereichs wird der dort erfolgende Luftaustausch und damit insbesondere auch der Abtransport kondensierter Feuchtigkeit ganz wesentlich verbessert.Via the dimensionally stable line section 44, air 46, which enters the dimensionally stable hollow body 38 via the air inlet 40, flows to an air outlet of the hollow body 38, for example to the air outlet 42. The air outlet 42 is located, for example, at a location which is without a special outlet Air flow would not or only to a small extent with air 46 would be flowed. This is, for example, a corner area located inside the housing 22 in the vicinity of the cover disk. The flow of air through the air outlet 42 in this region considerably improves the air exchange taking place there, and thus in particular also the removal of condensed moisture.

In der Ausgestaltung, die in der Figur 3 dargestellt ist, weist der formstabile Hohlkörper 38 drei Luftauslässe 42, 48 und 50 auf. Diese drei Luftauslässe sind in einem unteren Bereich des Scheinwerfers 20 bevorzugt so angeordnet, dass der aus ihnen austretende Luftstrom 46 auf die Abdeckscheibe trifft, dort nach oben umgelenkt wird und an der Abdeckscheibe entlang streichend zunächst weiter nach oben und dann zur Entlüftungsöffnung 36 des Gehäuses 22 geführt wird. Der Luftstrom tritt dann über die Entlüftungsöffnung 36 aus dem Scheinwerfer 20 aus. Bei der Durchströmung des Scheinwerfers 20 und insbesondere beim Vorbeistreichen an der Abdeckscheibe nimmt der Luftstrom 46 im Inneren des Gehäuses 22 kondensierte Feuchtigkeit auf und transportiert diese über die Entlüftungsöffnung 36 aus dem Scheinwerfer 20 heraus.In the embodiment, in the FIG. 3 is shown, the dimensionally stable hollow body 38 has three air outlets 42, 48 and 50. These three air outlets are preferably arranged in a lower region of the headlamp 20 such that the air flow 46 exiting from them impinges on the cover plate, is deflected up there and brushes along the cover plate first further upwards and then to the vent opening 36 of the housing 22 to be led. The air flow then exits through the vent opening 36 from the headlight 20. When the headlamp 20 flows through and in particular when passing on the cover, the air flow 46 in the interior of the housing 22 condensed moisture and transports it via the vent opening 36 from the headlight 20 out.

Der formstabile Hohlkörper 38 wird in einer bevorzugten Ausgestaltung durch thermisches Umformen von Kunststoff hergestellt. Als Herstellungsverfahren wird dabei insbesondere das sogenannte Twin-Sheet-Forming (Zwei-Platten-Formen) bevorzugt. Dies hat den Vorteil einer weitgehenden Gestaltungsfreiheit der Geometrie des formstabilen Hohlkörpers 38 und seiner Befestigungselemente 51.The dimensionally stable hollow body 38 is produced in a preferred embodiment by thermal deformation of plastic. As a manufacturing method in particular the so-called twin-sheet forming (two-plate molding) is preferred. This has the advantage of extensive design freedom of the geometry of the dimensionally stable hollow body 38 and its fastening elements 51st

Solche Befestigungselemente 51 sind bevorzugt an den Hohlkörper 38 stoffschlüssig angeformt und dazu eingerichtet, durch Befestigungsarten wie Schrauben, Klemmen, Klammern, Verclipsen und so weiter mit dem Gehäuse 22 des Scheinwerfers 20 und/oder dem Inventar des Scheinwerfers verbunden zu werden, um den Hohlkörper 38 zu befestigen. Dabei wird unter dem Begriff des Inventars jedes Bauteil verstanden, das innerhalb des Gehäuses 22 des Scheinwerfers 20 angeordnet ist. Zu diesen Bauteilen gehören insbesondere technische Strukturen zur Verwirklichung einer Vielzahl von Lichtfunktionen, also insbesondere die dafür benötigten optischen Elemente, seien es Lichtquellen, Reflektoren, Lichtleiter, transparente Vorsatzoptiken (interne Totalreflexionen nutzende optische Elemente) oder Linsen (Lichtbrechungen nutzende optische Elemente) und die erforderlichen Halter und gegebenenfalls auch Antriebsstrukturen.Such fasteners 51 are preferably integrally formed on the hollow body 38 and adapted to be connected by fastening types such as screws, clamps, clips, clipping and so on to the housing 22 of the headlamp 20 and / or the inventory of the headlamp to the hollow body 38th to fix. In this case, the term "inventory" means any component which is arranged within the housing 22 of the headlight 20. These components include in particular technical structures for the realization of a variety of light functions, ie in particular the required optical elements, be it light sources, reflectors, optical fibers, transparent optical attachments (internal total reflections using optical elements) or lenses (optical refractive optical elements) and the required Holder and possibly also drive structures.

Antriebsstrukturen sind zum Beispiel für eine Blendenverstellung eines Projektionssystems, eine Leuchtweitenregelung oder eine Kurvenlichtfunktion erforderlich. Darüber hinaus gehören zum Inventar moderner Scheinwerfer Strukturen, mit denen ein Erscheinungsbild des Scheinwerfers bewusst gestaltet wird. Dazu gehören insbesondere Strukturen wie die flächige Abdeckung 5 in den Figuren 1 und 2, die dazu dienen, einem außenstehenden Betrachter die dahinter liegenden technischen Strukturen zu verbergen. In der Figur 3 ist das gesamte Inventar eines solchen Scheinwerfers bis auf den formstabilen Hohlkörper 38 nicht dargestellt. Bei realen Scheinwerfern ist dieses Inventar natürlich immer vorhanden und der formstabile Hohlkörper 38 stellt dann lediglich ein weiteres Element des Scheinwerferinventars dar.Drive structures are required, for example, for a diaphragm adjustment of a projection system, a headlight range control or a cornering light function. In addition, the inventory of modern headlamps includes structures that deliberately shape the appearance of the headlamp. These include in particular structures such as the flat cover 5 in the Figures 1 and 2 that serve to an outsider Observers to hide the underlying technical structures. In the FIG. 3 the entire inventory of such a headlamp is not shown except for the dimensionally stable hollow body 38. In the case of real headlamps, this inventory is of course always present and the dimensionally stable hollow body 38 then represents only one more element of the headlamp inventory.

Das Twin-Sheet-Forming erlaubt zum Beispiel auch eine sehr variable Gestaltung des Verlaufs und des Querschnitts des formstabilen Hohlkörpers 38 in seiner Anordnung zwischen den ihn im eingebauten Zustand umgebenden anderen Elementen des Scheinwerferinventars. Als Material für den formstabilen Hohlkörper 38 wird in einer bevorzugten Ausgestaltung ein fester Kunststoff wie Polypropylen verwendet. Dadurch ist die angestrebte Formstabilität des Hohlkörpers 38 und die Positionierbarkeit und Montierbarkeit des Hohlkörpers 38 im Scheinwerfer 20 gewährleistet.The twin-sheet forming allows, for example, a very variable design of the course and the cross section of the dimensionally stable hollow body 38 in its arrangement between the surrounding it in the installed state other elements of the headlamp inventory. As a material for the dimensionally stable hollow body 38, a solid plastic such as polypropylene is used in a preferred embodiment. As a result, the desired dimensional stability of the hollow body 38 and the positionability and mountability of the hollow body 38 in the headlight 20 is ensured.

In einer bevorzugten Ausgestaltung weist der formstabile Hohlkörper zwischen seinem Lufteinlass 40 und einem in Bezug auf die im Hohlkörper 38 strömende Luft am weitesten von dem Lufteinlass 40 entfernten Luftauslass 42 wenigstens einen weiteren Luftauslass 48 und/oder 50 und/oder gegebenenfalls auch mehr als zwei weitere Luftauslässe 48, 50 auf. Dadurch wird eine gleichmäßigere Verteilung der aus dem Hohlkörper 38 ausströmenden Luft erzielt, als dies der Fall wäre, wenn der Hohlkörper 38 nur einen einzigen Luftauslass 42 aufweisen würde. Diese Ausgestaltung erlaubt damit insgesamt eine gleichmäßigere Anströmung der Abdeckscheibe als dies mit nur einem Luftauslass möglich wäre. In Bezug auf die Querschnitte der Luftauslässe 42, 48, 50 sind, je nach Ausgestaltung, verschiedene Formen möglich. In einer Ausgestaltung ist der Ausströmquerschnitt rund oder weist zumindest gerundete Teile seines Randes auf.In a preferred embodiment, the dimensionally stable hollow body has at least one further air outlet 48 and / or 50 and / or optionally also more than two further air outlet 42 between its air inlet 40 and air flowing in the hollow body 38 farthest from the air inlet 40 Air outlets 48, 50 on. As a result, a more uniform distribution of the air flowing out of the hollow body 38 is achieved, as would be the case if the hollow body 38 had only a single air outlet 42. This configuration thus allows a more uniform flow of the cover as a whole would be possible with only one air outlet. With respect to the cross sections of the air outlets 42, 48, 50, depending on the configuration, different shapes are possible. In one embodiment, the outflow cross section round or has at least rounded parts of its edge.

Eine solche Ausgestaltung ist in den Figuren 4 und 5 dargestellt. In einer anderen Ausgestaltung ist der Ausströmquerschnitt eckig, insbesondere viereckig, wobei der Querschnitt insbesondere rechteckig oder quadratisch sein kann. Mit einer eher rechteckigen Ausgestaltung wird eine breitere und damit gleichmäßigere Luftströmung erzielt als mit einer zum Beispiel quadratischen Öffnung. Die zu den Ausströmquerschnitten führenden Abschnitte des formstabilen Hohlkörpers 38 können einen über ihrer Länge gleichmäßigen Querschnitt aufweisen, wie es beim Luftauslass 50 der Fall ist. Alternativ dazu können sie aber auch einen sich düsenartig verengenden Querschnitt aufweisen, wie es beim Luftauslass 48 der Fall ist. In einer weiteren Ausgestaltung kann sich der Querschnitt oder zumindest eine Breite des Querschnitts auch Venturi-düsen-artig erweitern, wie es beim Luftauslass 42 in der Figur 3 der Fall ist.
In Ausgestaltungen von Hohlkörpern 38, die mehrere Luftauslässe aufweisen, können diese untereinander gleich sein. In einer anderen Ausgestaltung sind die Querschnitte untereinander verschieden. Dies hat den Vorteil, dass die über die verschiedenen Querschnitte ausströmenden Luftmassenströme in ihrem Verhältnis zueinander durch die Geometrie, Größe und Anordnung der Querschnitte bei dem Entwurf des Hohlkörpers 38 festgelegt werden können.Such an embodiment is in the FIGS. 4 and 5 shown. In another embodiment, the outflow cross-section is angular, in particular quadrangular, wherein the cross-section can be rectangular or square in particular. With a more rectangular design, a wider and thus more uniform air flow is achieved than with a square opening, for example. The leading to the outflow sections of the dimensionally stable hollow body 38 may have a uniform over its length in cross-section, as is the case with the air outlet 50. Alternatively, however, they can also have a nozzle-like constricting cross-section, as is the case with the air outlet 48. In a further embodiment, the cross-section or at least a width of the cross section may also Venturi-nozzle-like expand, as it is the air outlet 42 in the FIG. 3 the case is.
In embodiments of hollow bodies 38, which have a plurality of air outlets, they can be equal to one another. In another embodiment, the cross sections are different from each other. This has the advantage that the air mass flows flowing out over the various cross sections can be determined in their relationship to one another by the geometry, size and arrangement of the cross sections in the design of the hollow body 38.

Figur 5 zeigt eine Ausgestaltung eines formstabilen Hohlkörpers 38 mit einer für einen bestimmten Scheinwerfertyp entworfenen individuellen Geometrie. In der Ausgestaltung, die in der Figur 4 dargestellt ist, weist der formstabile Hohlkörper 38 einen Lufteinlass 40 und einen ersten Luftauslass 42A sowie einen zweiten Luftauslass 42B auf. Darüber hinaus weist der formstabile Hohlkörper Befestigungsgeometrien 51A, 51B und 51C auf. Der formstabile Hohlkörper 38 ist einer bevorzugten Ausgestaltung als einstückiges und damit stoffschlüssig zusammenhängendes Bauteil verwirklicht. In einer alternativen und ebenfalls bevorzugten Ausgestaltung ist der formstabile Hohlkörper 38 aus mehreren Einzelteilen zusammengesetzt. FIG. 5 shows an embodiment of a dimensionally stable hollow body 38 with a designed for a particular type of headlight individual geometry. In the embodiment, in the FIG. 4 is shown, the dimensionally stable hollow body 38 has an air inlet 40 and a first air outlet 42A and a second Air outlet 42B on. In addition, the dimensionally stable hollow body has fastening geometries 51A, 51B and 51C. The dimensionally stable hollow body 38 is realized in a preferred embodiment as a one-piece and thus cohesively connected component. In an alternative and likewise preferred embodiment, the dimensionally stable hollow body 38 is composed of several individual parts.

Die Figur 4 zeigt eine Ausgestaltung, bei der der formstabile Hohlkörper aus einem ersten Bauteil 52 und einem zweiten Bauteil 54 zusammengesetzt ist. Das erste Bauteil 52 weist den Lufteinlass 40 und einen ersten Luftauslass 42A auf. Das zweite Bauteil 54 weist in der dargestellten Ausgestaltung einen zweiten Luftauslass 42B auf. Über eine Steckverbindung sind beide Bauteile 52, 54 miteinander verbunden. Dabei ist die Steckverbindung so ausgestaltet, dass sie einen offenen Strömungsquerschnitt in der Schnittstelle zwischen dem ersten Bauteil 52 und dem zweiten Bauteil 54 aufweist.
Über eine entsprechende Dimensionierung der Querschnitte des genannten offenen Strömungsquerschnitts in der Schnittstelle zwischen dem ersten Bauteil 52 und dem zweiten Bauteil 54 auf der einen Seite und dem ersten Luftauslass 42A auf der anderen Seite kann das Verhältnis der über diese Querschnitte strömenden Teilluftströme zueinander vorbestimmt werden. Im Ergebnis wird die über den Lufteinlass 40 in das erste Bauteil 52 einströmende Luft im ersten Bauteil 52 auf einen ersten Teilstrom und einen zweiten Teilstrom aufgeteilt.The FIG. 4 shows an embodiment in which the dimensionally stable hollow body of a first component 52 and a second component 54 is composed. The first component 52 has the air inlet 40 and a first air outlet 42A. The second component 54 has a second air outlet 42B in the illustrated embodiment. Via a plug-in connection, both components 52, 54 are connected to one another. In this case, the plug connection is designed such that it has an open flow cross-section in the interface between the first component 52 and the second component 54.
By way of a corresponding dimensioning of the cross sections of said open flow cross section in the interface between the first component 52 and the second component 54 on the one side and the first air outlet 42A on the other side, the ratio of the partial air flows flowing over these cross sections to one another can be predetermined. As a result, the air flowing into the first component 52 via the air inlet 40 in the first component 52 is split up into a first partial flow and a second partial flow.

Der erste Teilstrom tritt aus dem ersten Luftauslass 40 aus. Der zweite Teilstrom strömt vom ersten Bauteil 52 in das zweite Bauteil 54 über und tritt aus dem zweiten Luftauslass 42B aus. Aufgrund seiner die Luft verteilenden Funktion kann das erste Bauteil 52 auch als Luftverteiler bezeichnet werden. Das zweite Bauteil 54 stellt einen formstabilen Leitungsabschnitt dar, mit dem ein Teilstrom der Belüftungsluft in einen Teilbereich im Inneren des Gehäuses 22 des Scheinwerfers 20 geführt wird. Bei dem Teilbereich handelt es sich zum Beispiel um einen Bereich in einer Ecke im Inneren des Scheinwerfergehäuses 22, die von der transparenten Abdeckscheibe begrenzt wird.The first partial flow exits from the first air outlet 40. The second partial flow flows from the first component 52 into the second component 54 and exits from the second air outlet 42B. Because of its circulating air Function, the first component 52 may also be referred to as an air distributor. The second component 54 represents a dimensionally stable line section, with which a partial flow of the ventilation air is guided into a partial area in the interior of the housing 22 of the headlight 20. By way of example, the partial area is an area in a corner in the interior of the headlight housing 22, which is delimited by the transparent cover pane.

Für die Ausgestaltung eines formstabilen Hohlkörpers 38, die in der Figur 4 dargestellt ist, kann man zur Veranschaulichung annehmen, dass der erste Luftauslass 42A einen ersten unteren Eckbereich der Abdeckscheibe im Inneren des Gehäuses 22 anströmt, während der zweite Luftauslass 42B den verbleibenden anderen unteren Eckbereich der Abdeckscheibe im Inneren des Gehäuses 22 anströmt.For the design of a dimensionally stable hollow body 38, which in the FIG. 4 For illustration, it may be assumed that the first air outlet 42A flows against a first lower corner portion of the cover disk inside the housing 22, while the second air outlet 42B flows against the remaining other lower corner portion of the cover disk inside the housing 22.

Es sind gerade diese Eckbereiche, die für eine Ansammlung von kondensierter Feuchtigkeit besonders anfällig sind. Dies liegt zum einen daran, dass sie, bezogen auf das Fahrzeug, weit außen liegen und damit schnell abkühlen. Außerdem liegen sie unten, so dass Feuchtigkeit, die sich an höher gelegenen Stellen der Abdeckscheibe niederschlägt, aufgrund der Schwerkraft nach unten wandern kann. Beim Stand der Technik, wie er unter Bezug auf die Figuren 1 und 2 erläutert worden ist, liegt zumindest eine der Ecken auch noch abseits des diagonal durch das Innere des Gehäuses des Scheinwerfers strömenden Belüftungsstroms. Beide Effekte führen in der Summe dazu, dass es beim Stand der Technik vergleichsweise häufig störende Ansammlungen kondensierter Feuchtigkeit gibt, und dass vergleichsweise viel Zeit erforderlich ist, um diese kondensierte Feuchtigkeit durch eine bei fahrendem Fahrzeug erfolgende Belüftung wieder zu entfernen. Durch die Erfindung lässt sich die Belüftung eines solchen kritischen Bereichs gezielt verbessern.It is these very corner areas that are particularly vulnerable to accumulation of condensed moisture. This is partly due to the fact that they are located far outside with respect to the vehicle and thus cool down quickly. In addition, they lie down so that moisture, which precipitates at higher points of the cover, due to gravity can migrate down. In the state of the art, as he with reference to the Figures 1 and 2 has been explained, at least one of the corners is also off the diagonal flowing through the interior of the housing of the headlamp ventilation stream. Overall, both effects lead to relatively frequent disturbing accumulations of condensed moisture in the prior art, and comparatively much time is required to remove this condensed moisture by means of aeration taking place when the vehicle is moving. By The invention makes it possible to specifically improve the ventilation of such a critical area.

Figur 5 zeigt eine alternative Ausgestaltung eines formstabilen Hohlkörpers 38 mit einer für einen anderen Scheinwerfertyp entworfenen individuellen Geometrie. Der Gegenstand der Figur 5 unterscheidet sich vom Gegenstand der Figur 4 durch einen zusätzlichen dritten Luftauslass 42D und einen vierten Luftauslass 42C, die auf der Länge des formstabilen Hohlkörpers 38 verteilt zwischen dem ersten Luftauslass 42A und dem zweiten Luftauslass 42B angeordnet sind. FIG. 5 shows an alternative embodiment of a dimensionally stable hollow body 38 with a designed for a different type of headlight individual geometry. The object of FIG. 5 differs from the subject of FIG. 4 by an additional third air outlet 42D and a fourth air outlet 42C, which are arranged distributed along the length of the dimensionally stable hollow body 38 between the first air outlet 42A and the second air outlet 42B.

Im übrigen unterscheiden sich die beiden in den Figuren 4 und 5 dargestellten Ausgestaltungen formstabiler Hohlkörper 38 in ihrer Geometrie nicht. Sie sind also insbesondere im gleichen Scheinwerfergehäuse verwendbar. Dabei erzeugt die in der Figur 5 dargestellte Ausgestaltung eine gleichmäßigere Verteilung der Belüftungsluft über die Länge des Hohlkörpers 38 und damit auch über die Abmessungen der transparenten Abdeckscheibe, die mit dieser Luftströmung angeströmt wird.For the rest, the two differ in the FIGS. 4 and 5 not shown embodiments of dimensionally stable hollow body 38 in their geometry. So they are particularly useful in the same headlight housing. The generated in the FIG. 5 illustrated embodiment a more uniform distribution of the ventilation air over the length of the hollow body 38 and thus also over the dimensions of the transparent cover, which is flowed with this air flow.

Welche der beiden Ausgestaltungen nach den Figuren 4 und 5 in einem konkreten Fall Vorteile bietet, hängt von den Umständen des Einzelfalls ab. Die Ausgestaltung nach Figur 4 besitzt Vorteile in Fällen, in denen sich Kondenswasser bevorzugt in den Ecken niederschlägt. Die Ausgestaltung nach Figur 5 besitzt dann Vorteile, wenn der Kondenswasserniederschlag gleichmäßiger verteilt auftritt. Ein Vergleich der Figuren 4 und 5 verdeutlicht einen Vorteil einer mehrteiligen Ausführung des formstabilen Hohlkörpers 38. Sowohl bei der Ausgestaltung nach der Figur 4 als auch bei der Ausgestaltung nach der Figur 5 wird der gleiche Luftverteiler, also das gleiche Bauteil 52 verwendet, so dass eine Anpassung an die Erfordernisse verschiedener Scheinwerfer durch eine auf das zweite Bauteil 54 beschränkte Individualisierung erfolgen kann.Which of the two embodiments according to the FIGS. 4 and 5 offers advantages in a particular case depends on the circumstances of the case. The design after FIG. 4 has advantages in cases in which condensate is deposited preferentially in the corners. The design after FIG. 5 has advantages if the condensate precipitation occurs more evenly distributed. A comparison of FIGS. 4 and 5 illustrates an advantage of a multi-part design of the dimensionally stable hollow body 38. Both in the embodiment of the FIG. 4 as well as in the embodiment of the FIG. 5 the same air distributor, so the same component 52 is used, so that an adaptation to the requirements of different headlights can be done by a limited to the second component 54 individualization.

Die Figur 6 zeigt den formstabilen Hohlkörper 38 aus der Figur 5 in einer konkreten Ausführungsform eines Scheinwerfers. Figur 6 zeigt insbesondere die hohe Packungsdichte im Inneren des Gehäuses 22 des Scheinwerfers 20, die sich auch aus dem bewusst gestalteten Erscheinungsbild des Scheinwerfers 20 und der dafür verwendeten Strukturen im Inneren des Gehäuses 22 des Scheinwerfers 20 ergibt. Darüber hinaus wird die Packungsdichte auch durch die Vielzahl von Lichtfunktionen und der dafür benötigten optischen Elemente, seien es Lichtquellen, Reflektoren, Lichtleiter, Vorsatzoptiken oder Linsen, oder seien es die dafür notwendigen Halter und gegebenenfalls auch notwendigen Antriebsstrukturen.The FIG. 6 shows the dimensionally stable hollow body 38 from the FIG. 5 in a specific embodiment of a headlight. FIG. 6 shows in particular the high packing density in the interior of the housing 22 of the headlamp 20, which also results from the deliberately designed appearance of the headlamp 20 and the structures used for this purpose in the interior of the housing 22 of the headlamp 20. In addition, the packing density is also due to the large number of light functions and the optical elements required for it, be it light sources, reflectors, optical fibers, attachment optics or lenses, or be it necessary holder and possibly also necessary drive structures.

Antriebsstrukturen sind zum Beispiel für eine Leuchtweitenregelung, eine Blendenverstellung und/oder eine Kurvenlichtfunktion erforderlich. Diese Strukturen werden heute in der Regel hinter Zierrahmen, Blenden und dergleichen verborgen. Es sind unter anderem diese Zierrahmen und Blenden, die eine Luftzirkulation im Inneren des Gehäuses 22 und damit einen wirkungsvollen Abtransport von Kondensat von der Innenseite der Abdeckscheibe 8 erschweren.Drive structures are required, for example, for a headlight range control, an aperture adjustment and / or a cornering light function. These structures are today usually hidden behind decorative frames, screens and the like. There are, among other things, these decorative frames and panels that complicate air circulation inside the housing 22 and thus an effective removal of condensate from the inside of the cover 8.

Figur 6 verdeutlicht durch ihre Schnittdarstellung, dass insbesondere dann, wenn nur noch enge Luftspalte 56 zwischen den verschiedenen Bauteilen, insbesondere verschiedenen Zierrahmen und Abdeckrahmen im Inneren des Gehäuses 22 vorhanden sind, die Erfindung eine ganz gezielte Anströmung dieser Spalte 56 erlaubt, so dass trotz der Enge eines solchen Spalts 56 noch eine zur Abdeckscheibe 8 gerichtete Vorzugsrichtung der Belüftungsluft im Innern des Scheinwerfergehäuses 22 erzeugt wird. FIG. 6 illustrated by their sectional view that, in particular, if only narrow air gaps 56 between the various components, in particular different decorative frame and cover frame inside the Housing 22 are present, the invention allows a very targeted flow of this column 56, so that despite the narrowness of such a gap 56 still directed to the cover 8 preferred direction of the ventilation air inside the headlight housing 22 is generated.

Die Figur 6 verdeutlicht auch, dass eine länglich gestreckte Form des Luftauslassquerschnitts eines Luftauslasses 42C für eine Anströmung des Spalts 56 günstig ist. Dies gilt insbesondere für die dargestellte Ausgestaltung, bei der der Luftauslassquerschnitt des Luftauslasses 42C des formstabilen Hohlkörpers 38 in einer zur Längsausdehnung der Spalte 56 parallelen Richtung verbreitert ist. Dadurch wird der Strömungswiderstand, den die Luft beim Anströmen der Spalte 56 überwinden muss, minimiert.The FIG. 6 also illustrates that an elongate elongate shape of the air outlet cross-section of an air outlet 42C is favorable for flow of the gap 56. This applies in particular to the illustrated embodiment, in which the air outlet cross-section of the air outlet 42C of the dimensionally stable hollow body 38 is widened in a direction parallel to the longitudinal extent of the column 56. As a result, the flow resistance, which must overcome the air during the flow of the column 56, minimized.

Fig. 7 zeigt eine Ausgestaltung, die sich dadurch auszeichnet, dass der Hohlkörper 38 einen Kühlluftauslass 58 aufweist, der so angeordnet ist, dass dort ausströmende Luft 46 ein zu kühlendes Bauteil 60 innerhalb des Scheinwerfers 20 anströmt. Bei dem zu kühlenden Bauteil handelt es sich in einer Ausgestaltung um einen Kühlkörper 62 einer Halbleiterlichtquelle 64, die auf einem Schaltungsträger 66 befestigt und über den Schaltungsträger elektrisch mit Energie versorgt und gesteuert wird, wobei der Schaltungsträger seinerseits thermisch mit dem Kühlkörper gekoppelt ist, so dass die die in der Halbleiterlichtquelle freiwerdende elektrische Verlustwärme vom Kühlkörper aufgenommen wird. Fig. 7 shows an embodiment which is characterized in that the hollow body 38 has a cooling air outlet 58 which is arranged so that there flowing out of air 46 flows to a component 60 to be cooled within the headlamp 20. In one embodiment, the component to be cooled is a heat sink 62 of a semiconductor light source 64, which is fastened to a circuit carrier 66 and electrically supplied and controlled via the circuit carrier, wherein the circuit carrier is in turn thermally coupled to the heat sink, so that the heat released in the semiconductor light source electrical heat loss is absorbed by the heat sink.

In einer alternativen Ausgestaltung handelt es sich bei dem zu kühlenden Bauteil um ein Steuergerät des Scheinwerfers 20, mit dem die Lichtquelle und/oder ein oder mehrere Antriebe des Scheinwerfers gesteuert werden. Solche Antriebe sind in modernen Scheinwerfern zum Verändern von Positionen von Blenden, zum Schwenken eines Lichtmoduls nach rechts und links und zum Schwenken eines Lichtmoduls nach oben und unten vorhanden. Die Veränderung der Blendenposition erfolgt zum Verändern einer Lichtverteilung, zum Beispiel zum Umsteuern zwischen einer Fernlicht-Lichtverteilung und einer Abblendlicht-Lichtverteilung. Das Schwenken nach rechts und nach links erfolgt zur Verwirklichung einer Kurvenlichtfunktion und das Schwenken nach oben und unten erfolgt zum Verwirklichen einer Leuchtweitenregelung.In an alternative embodiment, the component to be cooled is a control device of the headlight 20, with which the light source and / or a or multiple drives of the headlamp are controlled. Such drives are present in modern headlamps for varying positions of apertures, for pivoting a light module to the right and left, and for pivoting a light module up and down. The change of the diaphragm position is done to change a light distribution, for example, to switch between a high beam light distribution and a low beam light distribution. The pivoting to the right and to the left is to achieve a cornering light function and the pivoting up and down to realize a headlight range control.

Claims (10)

  1. A headlight (20) for motor vehicles, having:
    - a housing (22, 8), having a light exit opening, with a transparent cover disk (8) which covers the light exit opening,
    - at least one air supply opening (34) and at least one air vent opening (36) in the housing, which serve to supply air to and ventilate the headlight housing itself,
    wherein the headlight has guide means, which an air stream (46), flowing from the air supply opening to the air vent opening inside the housing, and which have a dimensionally stable hollow body (38) with an air inlet (40), at least one air outlet (42), and a dimensionally stable duct segment (44) located between the air inlet and the air outlet,
    characterized in that decorative frames and covering frames are located in the interior of the housing (22, 8),
    and the headlight, in its interior, has an air gap between decorative frames and covering frames,
    and an air outlet cross section (42) of the hollow body (38) has a longitudinally elongated shape,
    and the air outlet cross section is widened in a direction parallel to the longitudinal extent of the gap,
    so that by means of a very purposeful oncoming flow to the gap, despite the narrowness of such a gap, a preferential direction, aimed at the cover disk (8), of the air for the air supply is generated in the interior of the headlight housing (22).
  2. The headlight (20) of claim 1, characterized in that the hollow body has fastening elements (51), which are formed materially onto the hollow body and are arranged for being connected to the housing of the headlight and/or to the equipment inside the headlight by means of such fastening types as screws, clamps, staples, or clips, in order to secure the hollow body.
  3. The headlight (20) of one of the foregoing claims, characterized in that the dimensionally stable hollow body consists of a solid plastic, such as polypropylene.
  4. The headlight (20) of one of the foregoing claims, characterized in that the dimensionally stable hollow body, between its air inlet (40) and an air outlet (42) which with respect to the air flowing in the hollow body is located the farthest away from the air inlet (40), have at least one further air outlet (48).
  5. The headlight (20) of one of the foregoing claims, characterized in that the dimensionally stable hollow body is realized as a one-piece and hence materially cohesive component.
  6. The headlight (20) of one of claims 1 through 4, characterized in that the dimensionally stable hollow body is composed of a plurality of individual parts (52, 54).
  7. The headlight (20) of claim 6, characterized in that the dimensionally stable hollow body is composed of a first component (52) and a second component (54), and the first component has the air inlet (40), and the air outlet is divided into a first air outlet (42A) and at least one second air outlet, and the first component has the first air outlet and the second component has the at least one second air outlet (42B) .
  8. The headlight (20) of one of the foregoing claims, characterized in that the hollow body has a cooling air outlet (58), which is located such that air (46) flowing out there flows to a component (60) inside the headlight, which component is to be cooled.
  9. The headlight (20) of claim 8, characterized in that the component to be cooled is a heat sink (62) of a semiconductor light source (64).
  10. The headlight (20) of claim 8, characterized in that the component to be cooled is a control unit of the headlight (20).
EP12191395.8A 2011-12-21 2012-11-06 Headlamp with means for air guidance within the headlamp housing Active EP2607784B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011089494A DE102011089494A1 (en) 2011-12-21 2011-12-21 Headlight with means for guiding air inside the headlight housing

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EP2607784A1 EP2607784A1 (en) 2013-06-26
EP2607784B1 true EP2607784B1 (en) 2019-04-03

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EP12191395.8A Active EP2607784B1 (en) 2011-12-21 2012-11-06 Headlamp with means for air guidance within the headlamp housing

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EP (1) EP2607784B1 (en)
CN (1) CN103175083B (en)
DE (1) DE102011089494A1 (en)

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Publication number Publication date
CN103175083A (en) 2013-06-26
DE102011089494A1 (en) 2013-06-27
CN103175083B (en) 2017-05-17
EP2607784A1 (en) 2013-06-26

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