EP3542098B1 - Heat sink having variable thermal resistance - Google Patents

Heat sink having variable thermal resistance Download PDF

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Publication number
EP3542098B1
EP3542098B1 EP17794213.3A EP17794213A EP3542098B1 EP 3542098 B1 EP3542098 B1 EP 3542098B1 EP 17794213 A EP17794213 A EP 17794213A EP 3542098 B1 EP3542098 B1 EP 3542098B1
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EP
European Patent Office
Prior art keywords
heat sink
motor vehicle
vehicle headlamp
contact
elements
Prior art date
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Application number
EP17794213.3A
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German (de)
French (fr)
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EP3542098A1 (en
Inventor
Peter Mayer
Michael Brunner
Martin Ebner
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ZKW Group GmbH
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ZKW Group GmbH
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Publication of EP3542098A1 publication Critical patent/EP3542098A1/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
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F21S45/48—Passive cooling, e.g. using fins, thermal conductive elements or openings with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/657—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by moving light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F2013/005—Thermal joints
    • F28F2013/008—Variable conductance materials; Thermal switches

Definitions

  • the invention relates to a motor vehicle headlight with a headlight housing and a cover plate with at least one light source arranged in this motor vehicle headlight, wherein the light of the at least one light source can be imaged in the form of a defined light distribution in front of the motor vehicle headlight, and a heat sink device is provided for cooling the at least one light source is.
  • light sources such as, for example, incandescent lamps, high-intensity discharge lamps or light-emitting diodes, are generally arranged within the headlight housing.
  • these usual light sources and their components generate heat that needs to be dissipated.
  • Light-emitting diodes in particular should be kept below their maximum operating temperature in order to ensure optimum performance and longevity.
  • the ambient temperature of the vehicle headlight in operation is lower than inside the motor vehicle headlight itself, and so the most practical solution is to dissipate the heat generated inside the motor vehicle headlight to the ambient temperature.
  • a separate cooling device is provided , which is mounted so that it cools the interior of the motor vehicle headlight and the light sources arranged therein by emitting heat to the external environment.
  • Motor vehicle headlights are normally attached to a portion of the vehicle frame that adjoins the engine compartment, which is often temperatures significantly higher than the external ambient temperature. For example, during the During operation of the vehicle, heat is emitted in the engine compartment by the combustion engine and various components. The air in the engine compartment is also heated by solar energy when the vehicle is in use and not in use. It would therefore be obvious to determine the temperature inside the motor vehicle headlight as in the patent application DE 10 2006 057 569 B4 described to dissipate through the cover of a built-in motor vehicle headlight. However, for optical reasons and in order not to restrict the functionality of the cover panel, which can be partially transparent in the light-emitting direction of the motor vehicle headlight, this is not avoided.
  • heat sink devices are attached to the vehicle headlights in such a way that, when installed, they are arranged in the direction of the engine compartment.
  • the temperature in the engine compartment can optionally be the same or higher than the temperature inside the motor vehicle headlight.
  • the interior of the motor vehicle headlight cannot be cooled by the heat sink device arranged in the direction of the engine compartment, but would even heat it up. It is therefore advantageous to equip the motor vehicle headlight with a cooling device which shields the interior of the motor vehicle headlight and the light sources arranged therein from the relatively high temperatures in the engine compartment.
  • the object of the invention is to provide, in addition to the above-mentioned limitations and other disadvantages of the prior art, a motor vehicle headlight which has a heat sink device which cools the interior of the motor vehicle headlight and shields the light sources arranged therein from the relatively high temperatures in the engine compartment.
  • the heat sink device comprises two heat sink elements separated from one another by an air gap, which are arranged in such a way that a first heat sink element is attached in the interior of the motor vehicle headlight and a second heat sink element is attached outside the motor vehicle headlight, the heat sink device being provided with a contacting device, which is designed in such a way that heat exchange between the heat sink elements via them Contacting device takes place when the temperature in the interior of the motor vehicle headlight is higher than the temperature in the area outside the motor vehicle headlight on which the second heat sink element is attached, and that no heat exchange between the heat sink elements is possible when the temperature in the interior of the motor vehicle headlight is lower than the temperature in the area outside the motor vehicle headlight to which the second heat sink element is attached.
  • thermoelectric device provides that the heat sink elements are arranged in such a way that the first heat sink element is placed in heat transfer contact with the at least one light source arranged in the headlight housing.
  • the second heat sink element when the motor vehicle headlight is installed, is directed in the direction of the engine compartment, preferably positioned in an engine compartment.
  • heat sink elements are arranged in a fixed manner with respect to one another.
  • the contacting device can advantageously comprise at least one thermally conductive contact element which is movable with respect to the heat sink elements.
  • the contacting device comprises a contact element or a plurality of contact elements, which enables heat exchange between the heat sink elements when the temperature in the interior of the motor vehicle headlight is higher than the temperature in the area outside the motor vehicle headlight to which the second heat sink element is attached, wherein the contact element or the contact elements of the contacting device are in simultaneous thermally conductive contact with the first heat sink element and the second heat sink element, and that no heat exchange between the heat sink elements is possible if the temperature in the interior of the motor vehicle headlight is lower than the temperature in the area outside the motor vehicle headlight on which the second heat sink element is attached in that the comprised contact elements of the contacting device are only in contact with a respective heat sink element or no heat sink element.
  • the contact surfaces of the contact elements that touch each other in the above-described temperature condition in order to transfer heat can, for example, be flat or planar, wear and tear or other reasons can lead to the contact surfaces of the contact elements no longer fully touching each other. This is detrimental to optimal heat transfer and therefore, for example, a heat-conducting paste or other means that are suitable for improving the heat transfer between two objects can be used.
  • the contacting device comprises a first and a second contact element which enable heat exchange between the heat sink elements when the temperature in the interior of the motor vehicle headlight is higher than the temperature in the area outside the motor vehicle headlight to which the second heat sink element is attached , wherein the first contact element is in simultaneous thermally conductive contact with the first heat sink element and at the same time via the second contact element with the second heat sink element, and that no heat exchange between the heat sink elements is possible if the temperature in the interior of the motor vehicle headlight is lower than the temperature in the Area outside of the motor vehicle headlight, to which the second heat sink element is attached, in that the contact elements of the contacting device are only in contact with one heat sink element each, but not with one another .
  • At least one contact element of the contacting device is mounted displaceably in at least one recess in a heat sink element.
  • the contact elements of the contacting device can be moved by at least one control element assigned to the respective contact element.
  • a first control element is assigned to the first contact element and a second control element is assigned to the second contact element.
  • the first control element can be designed such that when the temperature in the interior of the motor vehicle headlight rises, the first contact element is extended by the first control element, so that a thermally conductive contact can be made with the second contact element.
  • the second control element is designed such that when the temperature rises in the area outside the motor vehicle headlight to which the second heat sink element is attached, the second contact element is retracted through the second control element, so that a thermally conductive contact with the first contact element can be prevented.
  • control elements are made of a material which expands or contracts as a function of temperature.
  • control elements are made of bimetal.
  • bimetals are used as control elements, the same bimetal could, for example, be used for all control elements. It should be noted here that when the contact elements are heated or cooled by a certain ⁇ T, if the control elements - i.e. the bimetals - are positioned in a mirror-inverted manner, they cover the same distance. For a general functioning of the invention it is advisable to define a "calibration position" at a certain temperature, at which the contact surfaces of the contact elements touch each other at the same temperature.
  • the position of the contact elements could be set so that they just touch each other at, for example, 70 ° C in the interior of the headlight housing and at 70 ° C in the area outside the motor vehicle headlight to which the second heat sink element is attached and establish a thermally conductive contact. It would also be conceivable that the contact elements are positioned or calibrated in such a way that they are at 71 ° C. in the interior of the headlight housing and at 70 ° C. in the area outside the motor vehicle headlight on which the second heat sink element is located is attached, just touch it and make a thermally conductive contact.
  • the first calibration or positioning would therefore be a thermally conductive contact between the contact elements at the same temperature
  • the second possible calibration position in which there is currently a thermally conductive contact between the contact elements, is for a temperature difference at which the temperature in the interior of the headlight housing is just is higher than the temperature in the area outside the motor vehicle headlight.
  • Fig. 1 the motor vehicle headlight 100 according to the invention is shown with a headlight housing 102 and a cover plate 103 .
  • Light sources 104, 105 are mounted inside the motor vehicle headlight 100 , each of which casts light onto an associated reflector which is arranged below each light source.
  • Directional indications such as “up”, “down”, “front” or “rear” relate to a motor vehicle headlight in the installed state.
  • the first heat sink element 106 of the heat sink device 200 is placed in heat transfer contact with the light source 104 arranged in the motor vehicle headlight 100 and a second heat sink element 107 is outside the motor vehicle headlight 100 when the motor vehicle headlight is installed 100 directed towards the engine compartment.
  • FIG Fig. 2 A detailed view of the heat sink device 200 and the included components is shown in FIG Fig. 2 shown.
  • the heat sink device 200 comprises two heat sink elements 201, 202 separated from one another by an air gap 209, the two heat sink elements 201, 202 being positioned in a fixed manner relative to one another.
  • the contacting device 210 which can produce thermal contact between the two separate heat sink elements 201, 202, is arranged between the heat sink elements 201, 202.
  • This contacting device 210 comprises the heat-conducting contact elements 203, 204, as well as the associated temperature-dependent control elements 207, 208.
  • a first contact element 203 is mounted in a recess 205 present in the first heat sink element 201 and a second contact element 204 is mounted displaceably in a recess 206 present in the second heat sink element 202.
  • a first control element 207 is assigned to the first contact element 203 and a second control element 208 is assigned to the second contact element 204.
  • the contact elements 203, 204 can be moved at least partially into or out of the recesses 205 , 206 by the respective control elements 207, 208, which are made of bimetal in the example shown.
  • FIG. 12 shows the state of the heat sink device 200 from FIG Fig. 2 , at which the temperature in the interior of the motor vehicle headlight 100 is higher than the temperature in the area of the second heat sink element 202 directed into the engine compartment, the first contact element 203 having been moved out of the recess 205 of the first heat sink element 201 by the temperature-dependent first control element 207 so as to produce heat-conductive contact with the second contact element 204 of the second heat sink element 202 and dissipate heat to the second heat sink element 202 .
  • Fig. 4 the state of the heat sink device 200 is off Fig. 2 ready, wherein been the temperature in the interior of the automotive lamp 100 is lower than the temperature in the range of the directed into the engine compartment, the second heat sink member 202, the second contact member 204 moves through the temperature-dependent second control member 208 in the recess 206 of the second heat sink member 202 so as to make contact with the first contact element 203 of the first heat sink element 201 interrupt, so that any heat exchange between the heat sink elements 201, 202 is prevented.
  • FIG. 5 two recesses 505, 506, 511, 512 are provided for each heat sink element 501, 502 , a first contact element 503 being assigned to the first heat sink element 501 and a second contact element 504 being assigned to the second heat sink element 502 and in this way in the existing recesses 505, 506, 511, 512 are arranged so that they cannot come into contact in any way by being at least partially pushed out of the recesses 505, 512 , with each contact element 503, 504 being at least partially moved into the recess 506, 511 opposite it, in order to exchange heat with to produce the heat sink element 501, 502 not assigned to it.
  • Fig. 6 shows a similar arrangement as in Fig. 5 , wherein the first and second contact element 603, 604 are assigned and arranged to a common second heat sink element 602 in separate recesses 606, 612 , and can each be moved out of these at least in part in order to establish a heat exchange with the first heat sink element 601 , which is provided without recesses and associated contact elements.
  • a similar example with only a single contact element 803, 904 is shown in FIG Figures 8 and 9 shown, where in Fig. 8 in contrast to Fig. 9 an additional recess 805 is provided in the first heat sink element 801 .
  • Fig. 7 shows, in contrast to the in Fig. 2
  • the embodiment shown has an additional second recess 712 in the second heat sink element 702, the second contact element 704 being shaped like a horseshoe so that it can be arranged in both recesses 706, 712 of the second heat sink element 702.
  • the first contact element 1003 is preferably movably arranged on the upper or lower side of the first heat sink element 1001 , the first heat sink element 1001 not having any recesses, and the second contact element 1004 is arranged in the recess 1006 of the second heat sink element 1002 and is shaped such that it can produce heat exchange with the preferably movable first contact element 1003 when it is at least partially pushed out of the recess 1006.
  • temperature sensors may be provided, with a temperature sensor in the interior of the motor vehicle headlight 100 and a further temperature sensor in the area outside the motor vehicle headlight 100 on which the second heat sink element 502, 602, 802, 902 is arranged.
  • a controller compares the temperatures recorded by the temperature sensors, compares them and shifts the respective contact element 503, 504, 603, 604, 803, 904 via the contact element 503, 504, 603, 604, 803, 904 assigned to the contact element 503, 504, 603, 604, 803, 904, not in these figures
  • Drawn control element 207 , 208 with the help of a drive, for example a linear motor or bellows and diaphragm drives, so that thermal contact can be established or prevented according to the temperature conditions described above.
  • Heat sink device 200 first heat sink element 106, 201, 501, 601, 701, 801, 901, 1001 second heat sink element 107, 202, 502, 602, 702, 802, 902, 1002 Air gap 209
  • Contacting device 210 first contact element 108, 203, 503, 603, 703, 803, 904, 1003 second contact element 109, 204, 504, 604, 704, 1004 first control 207 second control 208 Recess 205, 206, 505, 506, 511, 512, 606, 612, 705, 706, 712, 805, 806, 906, 1006

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Description

Die Erfindung betrifft einen Kraftfahrzeugscheinwerfer mit einem Scheinwerfergehäuse und einer Abdeckscheibe mit zumindest einer in diesem Kraftfahrzeugscheinwerfer angeordneten Lichtquelle, wobei das Licht der zumindest einen Lichtquelle in Form einer definierten Lichtverteilung vor dem Kraftfahrzeugscheinwerfer abgebildet werden kann, und wobei zur Kühlung der zumindest einen Lichtquelle eine Kühlkörpervorrichtung vorgesehen ist.The invention relates to a motor vehicle headlight with a headlight housing and a cover plate with at least one light source arranged in this motor vehicle headlight, wherein the light of the at least one light source can be imaged in the form of a defined light distribution in front of the motor vehicle headlight, and a heat sink device is provided for cooling the at least one light source is.

Bei einem Kraftfahrzeugscheinwerfer sind im Allgemeinen Lichtquellen innerhalb des Scheinwerfergehäuses angeordnet, wie beispielsweise Glühlampen, Hochintensitätsentladungslampen oder Leuchtdioden. Beim Betrieb des Kraftfahrzeugscheinwerfers erzeugen diese üblichen Lichtquellen und ihre Komponenten Wärme, die es abzuführen gilt. Besonders Leuchtdioden sollten unterhalb ihrer maximalen Betriebstemperatur gehalten werden, um eine optimale Leistung und Langlebigkeit zu gewährleisten.In the case of a motor vehicle headlight, light sources, such as, for example, incandescent lamps, high-intensity discharge lamps or light-emitting diodes, are generally arranged within the headlight housing. When the motor vehicle headlight is in operation, these usual light sources and their components generate heat that needs to be dissipated. Light-emitting diodes in particular should be kept below their maximum operating temperature in order to ensure optimum performance and longevity.

In der Regel ist die Umgebungstemperatur des in Betrieb stehenden Fahrzeugscheinwerfers niedriger als im Inneren des Kraftfahrzeugscheinwerfers selbst, und so ist die praktikabelste Lösung jene, die erzeugte Wärme im Inneren des Kraftfahrzeugscheinwerfers an die Umgebungstemperatur abzugeben.As a rule, the ambient temperature of the vehicle headlight in operation is lower than inside the motor vehicle headlight itself, and so the most practical solution is to dissipate the heat generated inside the motor vehicle headlight to the ambient temperature.

Da das Scheinwerfergehäuse eines Kraftfahrzeugscheinwerfers und eine den vorderen Bereich des Gehäuses abdeckende Abdeckscheibe jedoch üblicherweise den Innenraum des Kraftfahrzeugscheinwerfers von der Umgebung fluidisch abtrennen, um Verunreinigungen, wie Staub oder andere Schmutzpartikel, am Eindringen in den Innenraum des Kraftfahrzeugscheinwerfers zu hindern, ist eine eigene Kühlvorrichtung vorgesehen, die so angebracht ist, dass sie den Innenraum des Kraftfahrzeugscheinwerfers und die darin angeordneten Lichtquellen kühlt, indem sie Wärme an die äußere Umgebung abgibt.Since the headlight housing of a motor vehicle headlight and a cover plate covering the front area of the housing usually fluidically separate the interior of the motor vehicle headlight from the environment in order to prevent contaminants such as dust or other dirt particles from entering the interior of the motor vehicle headlight, a separate cooling device is provided , which is mounted so that it cools the interior of the motor vehicle headlight and the light sources arranged therein by emitting heat to the external environment.

Kraftfahrzeugscheinwerfer sind normalerweise an einem Abschnitt des Fahrzeugrahmens befestigt, der an den Motorraum angrenzt, der oftmals erheblich höhere Temperaturen aufweist als die äußere Umgebungstemperatur. Zum Beispiel wird während des Fahrzeugbetriebs im Motorraum Wärme durch den Verbrennungsmotor und verschiedenste Komponenten abgegeben. Ebenso wird die Luft im Motorraum bei Gebrauch als auch Nichtgebrauch des Fahrzeugs durch Sonnenenergie erwärmt. Naheliegend wäre es deshalb, die Temperatur im Inneren des Kraftfahrzeugscheinwerfers wie in der Patentanmeldung DE 10 2006 057 569 B4 beschrieben, über die Abdeckscheibe eines eingebauten Kraftfahrzeugscheinwerfers abzuführen. Davon wird jedoch aus optischen Gründen und um die Funktionalität der Abdeckscheibe, die in lichtemittierender Richtung des Kraftfahrzeugscheinwerfers zum Teil transparent ausgebildet sein kann, nicht einzuschränken abgesehen.Motor vehicle headlights are normally attached to a portion of the vehicle frame that adjoins the engine compartment, which is often temperatures significantly higher than the external ambient temperature. For example, during the During operation of the vehicle, heat is emitted in the engine compartment by the combustion engine and various components. The air in the engine compartment is also heated by solar energy when the vehicle is in use and not in use. It would therefore be obvious to determine the temperature inside the motor vehicle headlight as in the patent application DE 10 2006 057 569 B4 described to dissipate through the cover of a built-in motor vehicle headlight. However, for optical reasons and in order not to restrict the functionality of the cover panel, which can be partially transparent in the light-emitting direction of the motor vehicle headlight, this is not avoided.

Um nicht durch weitere bauliche Maßnahmen in die äußere Optik des Fahrzeugs einzugreifen, werden Kühlkörpervorrichtungen so an den Fahrzeugscheinwerfer angebracht, dass sie im eingebauten Zustand in Richtung Motorraum angeordnet sind. Wie bereits erwähnt, kann die Temperatur gegebenenfalls im Motorraum gleich hoch, bzw. höher sein als die Temperatur im Inneren des Kraftfahrzeugscheinwerfers. In diesem Fall kann das Innere des Kraftfahrzeugscheinwerfers durch die in Richtung Motorraum angeordnete Kühlkörpervorrichtung nicht gekühlt werden, sondern würde sie sogar noch aufheizen. Deshalb ist es von Vorteil, den Kraftfahrzeugscheinwerfer mit einer Kühlvorrichtung auszustatten, die das Innere des Kraftfahrzeugscheinwerfers und die darin angeordneten Lichtquellen gegen die relativ hohen Temperaturen im Motorraum abschirmt. Die DE 10 2007 057056 A1 offenbart einen Kraftfahrzeugscheinwerfer des Stands der Technik.In order not to interfere with the external appearance of the vehicle through further structural measures, heat sink devices are attached to the vehicle headlights in such a way that, when installed, they are arranged in the direction of the engine compartment. As already mentioned, the temperature in the engine compartment can optionally be the same or higher than the temperature inside the motor vehicle headlight. In this case, the interior of the motor vehicle headlight cannot be cooled by the heat sink device arranged in the direction of the engine compartment, but would even heat it up. It is therefore advantageous to equip the motor vehicle headlight with a cooling device which shields the interior of the motor vehicle headlight and the light sources arranged therein from the relatively high temperatures in the engine compartment. the DE 10 2007 057056 A1 discloses a prior art automotive headlamp.

Aufgabe der Erfindung ist es, zu oben erwähnten Einschränkungen und anderen Nachteilen des Standes der Technik einen Kraftfahrzeugscheinwerfer bereitzustellen, der eine Kühlkörpervorrichtung aufweist, die das Innere des Kraftfahrzeugscheinwerfers kühlt und die darin angeordneten Lichtquellen gegen die relativ hohen Temperaturen im Motorraum abschirmt.The object of the invention is to provide, in addition to the above-mentioned limitations and other disadvantages of the prior art, a motor vehicle headlight which has a heat sink device which cools the interior of the motor vehicle headlight and shields the light sources arranged therein from the relatively high temperatures in the engine compartment.

Diese Aufgabe wird dadurch gelöst, dass die Kühlkörpervorrichtung zwei durch einen Luftspalt voneinander getrennte Kühlkörperelemente umfasst, welche derart angeordnet sind, dass ein erstes Kühlkörperelement im Innenraum des Kraftfahrzeugscheinwerfers und ein zweites Kühlkörperelement außerhalb des Kraftfahrzeugscheinwerfers angebracht ist, wobei die Kühlkörpervorrichtung mit einer Kontaktiervorrichtung versehen ist, die derart ausgebildet ist, dass Wärmeaustausch zwischen den Kühlkörperelementen über diese Kontaktiervorrichtung stattfindet, wenn die Temperatur im Innenraum des Kraftfahrzeugscheinwerfers höher ist als die Temperatur in dem Bereich außerhalb des Kraftfahrzeugscheinwerfers, an dem das zweite Kühlkörperelement angebracht ist, und dass kein Wärmeaustausch zwischen den Kühlkörperelementen möglich ist, wenn die Temperatur im Innenraum des Kraftfahrzeugscheinwerfers niedriger ist als die Temperatur in dem Bereich außerhalb des Kraftfahrzeugscheinwerfers, an dem das zweite Kühlkörperelement angebracht ist.This object is achieved in that the heat sink device comprises two heat sink elements separated from one another by an air gap, which are arranged in such a way that a first heat sink element is attached in the interior of the motor vehicle headlight and a second heat sink element is attached outside the motor vehicle headlight, the heat sink device being provided with a contacting device, which is designed in such a way that heat exchange between the heat sink elements via them Contacting device takes place when the temperature in the interior of the motor vehicle headlight is higher than the temperature in the area outside the motor vehicle headlight on which the second heat sink element is attached, and that no heat exchange between the heat sink elements is possible when the temperature in the interior of the motor vehicle headlight is lower than the temperature in the area outside the motor vehicle headlight to which the second heat sink element is attached.

Eine vorteilhafte Weiterbildung der erfindungsgemäßen Vorrichtung sieht vor, dass die Kühlkörperelemente derart angeordnet sind, dass das erste Kühlkörperelement in Wärmeübertragungskontakt mit der zumindest einen im Scheinwerfergehäuse angeordneten Lichtquelle platziert ist.An advantageous development of the device according to the invention provides that the heat sink elements are arranged in such a way that the first heat sink element is placed in heat transfer contact with the at least one light source arranged in the headlight housing.

Weiters kann es zweckmäßig sein, wenn das zweite Kühlkörperelement im eingebauten Zustand des Kraftfahrzeugscheinwerfers in Richtung Motorraum gerichtet ist, vorzugsweise in einem Motorraum positioniert ist.Furthermore, it can be expedient if the second heat sink element, when the motor vehicle headlight is installed, is directed in the direction of the engine compartment, preferably positioned in an engine compartment.

Vorteilhaft kann es sein, wenn die Kühlkörperelemente in Bezug zueinander feststehend angeordnet sind.It can be advantageous if the heat sink elements are arranged in a fixed manner with respect to one another.

Vorteilhafterweise kann die Kontaktiervorrichtung zumindest ein wärmeleitendes Kontaktelement umfassen, welches bezüglich der Kühlkörperelemente beweglich ist.The contacting device can advantageously comprise at least one thermally conductive contact element which is movable with respect to the heat sink elements.

Erfindungsgemäß ist es vorgesehen, dass die Kontaktiervorrichtung ein Kontaktelement oder mehrere Kontaktelemente umfasst, welches Wärmeaustausch zwischen den Kühlkörperelementen ermöglicht, wenn die Temperatur im Innenraum des Kraftfahrzeugscheinwerfers höher ist als die Temperatur in dem Bereich außerhalb des Kraftfahrzeugscheinwerfers, an dem das zweite Kühlkörperelement angebracht ist, wobei das Kontaktelement oder die Kontaktelemente der Kontaktiervorrichtung dabei in gleichzeitigem wärmeleitenden Kontakt mit dem ersten Kühlkörperelement und dem zweiten Kühlkörperelement sind, und dass kein Wärmeaustausch zwischen den Kühlkörperelementen möglich ist, wenn die Temperatur im Innenraum des Kraftfahrzeugscheinwerfers niedriger ist als die Temperatur in dem Bereich außerhalb des Kraftfahrzeugscheinwerfers, an dem das zweite Kühlkörperelement angebracht ist, indem die umfassten Kontaktelemente der Kontaktiervorrichtung dabei nur in Kontakt mit jeweils einem Kühlkörperelement oder keinem Kühlkörperelement stehen.According to the invention, it is provided that the contacting device comprises a contact element or a plurality of contact elements, which enables heat exchange between the heat sink elements when the temperature in the interior of the motor vehicle headlight is higher than the temperature in the area outside the motor vehicle headlight to which the second heat sink element is attached, wherein the contact element or the contact elements of the contacting device are in simultaneous thermally conductive contact with the first heat sink element and the second heat sink element, and that no heat exchange between the heat sink elements is possible if the temperature in the interior of the motor vehicle headlight is lower than the temperature in the area outside the motor vehicle headlight on which the second heat sink element is attached in that the comprised contact elements of the contacting device are only in contact with a respective heat sink element or no heat sink element.

Da die Kontaktflächen der Kontaktelemente, die sich bei oben beschriebener Temperaturbedingung berühren, um Wärme zu übertragen, beispielsweise eben bzw. plan ausgeführt sein können, kann es durch Abnutzung oder anderen Gründen dazu führen, dass sich die Kontaktflächen der Kontaktelemente nicht mehr vollflächig berühren. Dies ist einer optimalen Wärmeübertragung abträglich und deshalb kann hierfür beispielsweise eine Wärmeleitpaste oder sonstige Mittel, die dazu geeignet sind die Wärmeübertragung zwischen zwei Objekten zu verbessern, eingesetzt werden.Since the contact surfaces of the contact elements that touch each other in the above-described temperature condition in order to transfer heat can, for example, be flat or planar, wear and tear or other reasons can lead to the contact surfaces of the contact elements no longer fully touching each other. This is detrimental to optimal heat transfer and therefore, for example, a heat-conducting paste or other means that are suitable for improving the heat transfer between two objects can be used.

Weiters kann es vorteilhaft sein, wenn die Kontaktiervorrichtung ein erstes und ein zweites Kontaktelement umfasst, welche Wärmeaustausch zwischen den Kühlkörperelementen ermöglichen, wenn die Temperatur im Innenraum des Kraftfahrzeugscheinwerfers höher ist als die Temperatur in dem Bereich außerhalb des Kraftfahrzeugscheinwerfers, an dem das zweite Kühlkörperelement angebracht ist, wobei das erste Kontaktelement dabei in gleichzeitigem wärmeleitenden Kontakt mit dem ersten Kühlkörperelement und zugleich über das zweite Kontaktelement mit dem zweiten Kühlkörperelement ist, und dass kein Wärmeaustausch zwischen den Kühlkörperelementen möglich ist, wenn die Temperatur im Innenraum des Kraftfahrzeugscheinwerfers niedriger ist als die Temperatur in dem Bereich außerhalb des Kraftfahrzeugscheinwerfers, an dem das zweite Kühlkörperelement angebracht ist, indem die Kontaktelemente der Kontaktiervorrichtung dabei nur in Kontakt mit jeweils einem Kühlkörperelement stehen, aber nicht miteinander.Furthermore, it can be advantageous if the contacting device comprises a first and a second contact element which enable heat exchange between the heat sink elements when the temperature in the interior of the motor vehicle headlight is higher than the temperature in the area outside the motor vehicle headlight to which the second heat sink element is attached , wherein the first contact element is in simultaneous thermally conductive contact with the first heat sink element and at the same time via the second contact element with the second heat sink element, and that no heat exchange between the heat sink elements is possible if the temperature in the interior of the motor vehicle headlight is lower than the temperature in the Area outside of the motor vehicle headlight, to which the second heat sink element is attached, in that the contact elements of the contacting device are only in contact with one heat sink element each, but not with one another .

Es kann vorgesehen sein, dass zumindest ein Kontaktelement der Kontaktiervorrichtung in zumindest einer Ausnehmung in einem Kühlkörperelement verschiebbar gelagert ist.It can be provided that at least one contact element of the contacting device is mounted displaceably in at least one recess in a heat sink element.

Es ist zweckmäßig, wenn genau zwei Kontaktelemente der Kontaktiervorrichtung in jeweils einer Ausnehmung in den Kühlkörperelementen verschiebbar gelagert sind.It is expedient if exactly two contact elements of the contacting device are each slidably mounted in a recess in the heat sink elements.

Mit Vorteil ist vorgesehen, wenn die Kontaktelemente der Kontaktiervorrichtung durch zumindest ein dem jeweiligen Kontaktelement zugeordnetes Steuerelement bewegt werden können.It is advantageously provided if the contact elements of the contacting device can be moved by at least one control element assigned to the respective contact element.

Weiter ist mit Vorteil vorgesehen, wenn dem ersten Kontaktelement ein erstes Steuerelement zugeordnet ist und dem zweiten Kontaktelement ein zweites Steuerelement zugeordnet ist.It is further advantageously provided if a first control element is assigned to the first contact element and a second control element is assigned to the second contact element.

Beispielsweise kann das erste Steuerelement derart ausgebildet sein, dass bei steigender Temperatur im Innenraum des Kraftfahrzeugscheinwerfers das erste Kontaktelement durch das erste Steuerelement ausgefahren wird, sodass ein wärmeleitender Kontakt mit dem zweiten Kontaktelement hergestellt werden kann.For example, the first control element can be designed such that when the temperature in the interior of the motor vehicle headlight rises, the first contact element is extended by the first control element, so that a thermally conductive contact can be made with the second contact element.

Weiters ist es günstig, wenn das zweite Steuerelement derart ausgebildet ist, dass bei steigender Temperatur in dem Bereich außerhalb des Kraftfahrzeugscheinwerfers, an dem das zweite Kühlkörperelement angebracht ist, das zweite Kontaktelement durch das zweite Steuerelement eingefahren wird, sodass ein wärmeleitender Kontakt mit dem ersten Kontaktelement unterbunden werden kann.Furthermore, it is advantageous if the second control element is designed such that when the temperature rises in the area outside the motor vehicle headlight to which the second heat sink element is attached, the second contact element is retracted through the second control element, so that a thermally conductive contact with the first contact element can be prevented.

Es ist zweckmäßig, wenn die Steuerelemente aus einem Material beschaffen sind, welches sich temperaturabhängig ausdehnt bzw. zusammenzieht.It is useful if the control elements are made of a material which expands or contracts as a function of temperature.

Bei einer Ausführungsform ist vorgesehen, dass die Steuerelemente aus Bimetall gefertigt sind.In one embodiment it is provided that the control elements are made of bimetal.

Bei Verwendung von Bimetallen als Steuerungselemente könnte beispielsweise für alle Steuerungselemente das gleiche Bimetall verwendet werden. Hierbei ist zu beachten, dass bei Erwärmung oder Abkühlung um ein bestimmtes ΔT die Kontaktelemente bei spiegelverkehrter Positionierung der Steuerungselemente - also der Bimetalle - im Betrag die gleiche Wegstrecke zurücklegen. Für ein allgemeines Funktionieren der Erfindung ist es ratsam eine "Eichposition" bei bestimmter Temperatur festzulegen, bei der die Kontaktflächen der Kontaktelemente sich bei gleicher Temperatur berühren.If bimetals are used as control elements, the same bimetal could, for example, be used for all control elements. It should be noted here that when the contact elements are heated or cooled by a certain ΔT, if the control elements - i.e. the bimetals - are positioned in a mirror-inverted manner, they cover the same distance. For a general functioning of the invention it is advisable to define a "calibration position" at a certain temperature, at which the contact surfaces of the contact elements touch each other at the same temperature.

Hierzu könnte die Position der Kontaktelemente so eingestellt sein, dass diese sich bei beispielsweise 70°C im Innenraum des Scheinwerfergehäuses und bei 70°C im Bereich außerhalb des Kraftfahrzeugscheinwerfers, an dem das zweite Kühlkörperelement angebracht ist, gerade berühren und einen wärmeleitenden Kontakt herstellen. Ebenso wäre denkbar, dass die Kontaktelemente so positioniert bzw. geeicht werden, dass diese sich bei beispielsweise 71°C im Innenraum des Scheinwerfergehäuses und bei 70°C im Bereich außerhalb des Kraftfahrzeugscheinwerfers, an dem das zweite Kühlkörperelement angebracht ist, gerade berühren und einen wärmeleitenden Kontakt herstellen. Die erste Eichung bzw. Positionierung wäre also ein wärmeleitender Kontakt zwischen den Kontaktelementen bei gleicher Temperatur, wobei die zweite mögliche Eichposition, bei der gerade ein wärmeleitender Kontakt zwischen den Kontaktelementen vorhanden ist, für einen Temperaturunterschied ist, bei welchem die Temperatur im Innenraum des Scheinwerfergehäuses gerade höher ist als die Temperatur in dem Bereich außerhalb des Kraftfahrzeugscheinwerfers.For this purpose, the position of the contact elements could be set so that they just touch each other at, for example, 70 ° C in the interior of the headlight housing and at 70 ° C in the area outside the motor vehicle headlight to which the second heat sink element is attached and establish a thermally conductive contact. It would also be conceivable that the contact elements are positioned or calibrated in such a way that they are at 71 ° C. in the interior of the headlight housing and at 70 ° C. in the area outside the motor vehicle headlight on which the second heat sink element is located is attached, just touch it and make a thermally conductive contact. The first calibration or positioning would therefore be a thermally conductive contact between the contact elements at the same temperature, the second possible calibration position, in which there is currently a thermally conductive contact between the contact elements, is for a temperature difference at which the temperature in the interior of the headlight housing is just is higher than the temperature in the area outside the motor vehicle headlight.

Im Folgenden ist die Erfindung an Hand der Zeichnungen näher erläutert. In dieser zeigt

  • Fig. 1 einen Querschnitt eines beispielhaften Kraftfahrzeugscheinwerfers,
  • Fig. 2 eine Seitenansicht einer erfindungsgemäßen Kühlkörpervorrichtung,
  • Fig. 3 eine Seitenansicht der Kühlkörpervorrichtung aus Fig. 2 im Zustand des Wärmeaustausches,
  • Fig. 4 eine Seitenansicht der Kühlkörpervorrichtung aus Fig. 2 im Zustand, bei dem kein Wärmeaustausch stattfindet,
  • Fig. 5, 6, 7, 8, 9 und 10 zeigen weitere mögliche Ausführungsformen der Kühlkörpervorrichtung.
The invention is explained in more detail below with reference to the drawings. In this shows
  • Fig. 1 a cross section of an exemplary motor vehicle headlight,
  • Fig. 2 a side view of a heat sink device according to the invention,
  • Fig. 3 Figure 3 is a side view of the heat sink device Fig. 2 in the state of heat exchange,
  • Fig. 4 Figure 3 is a side view of the heat sink device Fig. 2 in the state in which there is no heat exchange,
  • Figures 5, 6, 7, 8, 9 and 10 show further possible embodiments of the heat sink device.

In Fig. 1 ist der erfindungsgemäße Kraftfahrzeugscheinwerfer 100 mit einem Scheinwerfergehäuse 102 und einer Abdeckscheibe 103 abgebildet. Innerhalb des Kraftfahrzeugscheinwerfers 100 sind Lichtquellen 104, 105 angebracht, die jeweils Licht auf einen zugeordneten Reflektor werfen, der unterhalb jeder Lichtquelle angeordnet ist. Richtungsangaben wie "oben", "unten", "vorn" oder "hinten" beziehen sich auf einen Kraftfahrzeugscheinwerfer in eingebautem Zustand.In Fig. 1 the motor vehicle headlight 100 according to the invention is shown with a headlight housing 102 and a cover plate 103 . Light sources 104, 105 are mounted inside the motor vehicle headlight 100 , each of which casts light onto an associated reflector which is arranged below each light source. Directional indications such as “up”, “down”, “front” or “rear” relate to a motor vehicle headlight in the installed state.

Wie in Fig. 1 zu sehen, ist das erste Kühlkörperelement 106 der Kühlkörpervorrichtung 200 in Wärmeübertragungskontakt mit der im Kraftfahrzeugscheinwerfer 100 angeordneten Lichtquelle 104 platziert und ein zweites Kühlkörperelement 107 ist außerhalb des Kraftfahrzeugscheinwerfers 100 im eingebauten Zustand des Kraftfahrzeugscheinwerfers 100 in Richtung Motorraum gerichtet. Eine Detailansicht der Kühlkörpervorrichtung 200 und der umfassten Komponenten ist in Fig. 2 dargestellt.As in Fig. 1 As can be seen, the first heat sink element 106 of the heat sink device 200 is placed in heat transfer contact with the light source 104 arranged in the motor vehicle headlight 100 and a second heat sink element 107 is outside the motor vehicle headlight 100 when the motor vehicle headlight is installed 100 directed towards the engine compartment. A detailed view of the heat sink device 200 and the included components is shown in FIG Fig. 2 shown.

Wie in Fig. 2 zu sehen, umfasst die Kühlkörpervorrichtung 200 zwei durch einen Luftspalt 209 voneinander getrennte Kühlkörperelemente 201, 202, wobei beide Kühlkörperelemente 201, 202 zueinander feststehend positioniert sind. Zwischen den Kühlkörperelementen 201, 202 ist die Kontaktiervorrichtung 210 angeordnet, die einen Wärmekontakt zwischen den beiden getrennten Kühlkörperelementen 201, 202 herstellen kann. Diese Kontaktiervorrichtung 210 umfasst die wärmeleitenden Kontaktelemente 203, 204, sowie die zugehörigen temperaturabhängigen Steuerelemente 207, 208. As in Fig. 2 As can be seen, the heat sink device 200 comprises two heat sink elements 201, 202 separated from one another by an air gap 209, the two heat sink elements 201, 202 being positioned in a fixed manner relative to one another. The contacting device 210 , which can produce thermal contact between the two separate heat sink elements 201, 202, is arranged between the heat sink elements 201, 202. This contacting device 210 comprises the heat-conducting contact elements 203, 204, as well as the associated temperature-dependent control elements 207, 208.

Ein erstes Kontaktelement 203 ist in einer im ersten Kühlkörperelement 201 vorhandenen Ausnehmung 205 und ein zweites Kontaktelement 204 ist in einer im zweiten Kühlkörperelement 202 vorhandenen Ausnehmung 206 verschiebbar gelagert. Dem ersten Kontaktelement 203 ist ein erstes Steuerelement 207 und dem zweiten Kontaktelement 204 ein zweites Steuerelement 208 zugeordnet.A first contact element 203 is mounted in a recess 205 present in the first heat sink element 201 and a second contact element 204 is mounted displaceably in a recess 206 present in the second heat sink element 202. A first control element 207 is assigned to the first contact element 203 and a second control element 208 is assigned to the second contact element 204.

Die Kontaktelemente 203, 204 können durch die jeweiligen Steuerelemente 207, 208, welche in dem gezeigten Beispiel aus Bimetall gefertigt sind, in die bzw. aus den Ausnehmungen 205, 206 zumindest zum Teil hinein bzw. heraus bewegt werden.The contact elements 203, 204 can be moved at least partially into or out of the recesses 205 , 206 by the respective control elements 207, 208, which are made of bimetal in the example shown.

Fig. 3 zeigt den Zustand der Kühlkörpervorrichtung 200 aus Fig. 2 , bei dem die Temperatur im Innenraum des Kraftfahrzeugscheinwerfers 100 höher ist als die Temperatur im Bereich des in den Motorraum gerichteten, zweiten Kühlkörperelements 202, wobei das erste Kontaktelement 203 durch das temperaturabhängige, erste Steuerelement 207 aus der Ausnehmung 205 des ersten Kühlkörperelements 201 bewegt worden ist, um so wärmeleitenden Kontakt mit dem zweiten Kontaktelement 204 des zweiten Kühlkörperelements 202 herzustellen und Wärme an das zweite Kühlkörperelement 202 abzuführen. Fig. 3 FIG. 12 shows the state of the heat sink device 200 from FIG Fig. 2 , at which the temperature in the interior of the motor vehicle headlight 100 is higher than the temperature in the area of the second heat sink element 202 directed into the engine compartment, the first contact element 203 having been moved out of the recess 205 of the first heat sink element 201 by the temperature-dependent first control element 207 so as to produce heat-conductive contact with the second contact element 204 of the second heat sink element 202 and dissipate heat to the second heat sink element 202 .

In Fig. 4 ist der Zustand der Kühlkörpervorrichtung 200 aus Fig. 2 abgebildet, bei dem die Temperatur im Innenraum des Kraftfahrzeugscheinwerfers 100 niedriger ist als die Temperatur im Bereich des in den Motorraum gerichteten, zweiten Kühlkörperelements 202, wobei das zweite Kontaktelement 204 durch das temperaturabhängige, zweite Steuerelement 208 in die Ausnehmung 206 des zweiten Kühlkörperelements 202 bewegt worden ist, um so den Kontakt mit dem ersten Kontaktelement 203 des ersten Kühlkörperelements 201 zu unterbrechen, sodass jeglicher Wärmaustausch zwischen den Kühlkörperelementen 201, 202 unterbunden wird.In Fig. 4 the state of the heat sink device 200 is off Fig. 2 ready, wherein been the temperature in the interior of the automotive lamp 100 is lower than the temperature in the range of the directed into the engine compartment, the second heat sink member 202, the second contact member 204 moves through the temperature-dependent second control member 208 in the recess 206 of the second heat sink member 202 so as to make contact with the first contact element 203 of the first heat sink element 201 interrupt, so that any heat exchange between the heat sink elements 201, 202 is prevented.

Weitere mögliche Ausführungsformen der gegenständlichen Erfindung sind in den weiteren Figuren dargestellt, so können mehrere Ausnehmungen 505, 506, 511, 512, 606, 612, 705, 706, 712 für die jeweiligen Kühlkörperelemente 501, 502, 601, 602, 701, 702 vorgesehen sein, wie in Fig. 5, 6 und 7 gezeigt.Further possible embodiments of the present invention are shown in the further figures, so several recesses 505, 506, 511, 512, 606, 612, 705, 706, 712 can be provided for the respective heat sink elements 501, 502, 601, 602, 701, 702 be like in Figures 5, 6 and 7 shown.

In Fig. 5 sind je Kühlkörperelement 501, 502 zwei Ausnehmungen 505, 506, 511, 512 vorgesehen, wobei ein erstes Kontaktelement 503 dem ersten Kühlkörperelement 501 und ein zweites Kontaktelement 504 dem zweiten Kühlkörperelement 502 zugeordnet sind und derart in den vorhandenen Ausnehmungen 505, 506, 511, 512 angeordnet sind, dass diese in keiner Weise durch ein zumindest teilweises Herausschieben aus den Ausnehmungen 505, 512 in Kontakt treten können, wobei jedes Kontaktelement 503, 504 in die ihm jeweils gegenüberliegende Ausnehmung 506, 511 zumindest zum Teil bewegt werden kann, um einen Wärmeaustausch mit dem ihm nicht zugeordneten Kühlkörperelement 501, 502 herzustellen.In Fig. 5 two recesses 505, 506, 511, 512 are provided for each heat sink element 501, 502 , a first contact element 503 being assigned to the first heat sink element 501 and a second contact element 504 being assigned to the second heat sink element 502 and in this way in the existing recesses 505, 506, 511, 512 are arranged so that they cannot come into contact in any way by being at least partially pushed out of the recesses 505, 512 , with each contact element 503, 504 being at least partially moved into the recess 506, 511 opposite it, in order to exchange heat with to produce the heat sink element 501, 502 not assigned to it.

Fig. 6 zeigt eine ähnliche Anordnung wie in Fig.5 , wobei das erste und zweite Kontaktelement 603, 604 einem gemeinsamen zweiten Kühlkörperelement 602 in voneinander getrennten Ausnehmungen 606, 612 zugeordnet und angeordnet sind, und jeweils aus diesen zumindest zum Teil heraus bewegt werden können, um einen Wärmeaustausch mit dem ersten Kühlkörperelement 601 herzustellen, welches ohne Ausnehmungen und zugeordneten Kontaktelementen vorgesehen ist. Ein ähnliches Beispiel mit lediglich einem einzigen Kontaktelement 803, 904 ist in Fig. 8 und 9 gezeigt, wobei in Fig. 8 im Unterschied zu Fig. 9 eine zusätzliche Ausnehmung 805 in dem ersten Kühlkörperelement 801 vorgesehen ist. Fig. 6 shows a similar arrangement as in Fig. 5 , wherein the first and second contact element 603, 604 are assigned and arranged to a common second heat sink element 602 in separate recesses 606, 612 , and can each be moved out of these at least in part in order to establish a heat exchange with the first heat sink element 601 , which is provided without recesses and associated contact elements. A similar example with only a single contact element 803, 904 is shown in FIG Figures 8 and 9 shown, where in Fig. 8 in contrast to Fig. 9 an additional recess 805 is provided in the first heat sink element 801 .

Fig. 7 zeigt zum Unterschied der in Fig. 2 dargestellten Ausführungsform eine zusätzliche zweite Ausnehmung 712 im zweiten Kühlkörperelement 702, wobei das zweite Kontaktelement 704 hufeisenartig ausgeformt ist, sodass es in beiden Ausnehmungen 706, 712 des zweiten Kühlkörperelements 702 angeordnet werden kann. Fig. 7 shows, in contrast to the in Fig. 2 The embodiment shown has an additional second recess 712 in the second heat sink element 702, the second contact element 704 being shaped like a horseshoe so that it can be arranged in both recesses 706, 712 of the second heat sink element 702.

In Fig. 10 ist das erste Kontaktelement 1003 auf der oberen bzw. unteren Seite des ersten Kühlkörperelements 1001 vorzugsweise beweglich angeordnet, wobei das erste Kühlkörperelement 1001 keine Ausnehmungen aufweist, und das zweite Kontaktelement 1004 in der Ausnehmung 1006 des zweiten Kühlkörperelements 1002 angeordnet und derart ausgeformt ist, dass es beim zumindest teilweisen Herausschieben aus der Ausnehmung 1006 Wärmeaustausch mit dem vorzugsweise beweglichen ersten Kontaktelement 1003 herstellen kann.In Fig. 10 the first contact element 1003 is preferably movably arranged on the upper or lower side of the first heat sink element 1001 , the first heat sink element 1001 not having any recesses, and the second contact element 1004 is arranged in the recess 1006 of the second heat sink element 1002 and is shaped such that it can produce heat exchange with the preferably movable first contact element 1003 when it is at least partially pushed out of the recess 1006.

Es ist noch anzumerken, dass in den Fig. 5, 6, 7, 8, 9 und 10 auf ein Einzeichnen der jeweiligen Steuerungselemente 207, 208 verzichtet worden ist, wobei die Kontaktelemente dieser Ausführungsformen sehr wohl mit oben beschriebenen Steuerungselementen 207, 208 bewegt werden können.It should also be noted that in the Figures 5, 6, 7, 8, 9 and 10 the respective control elements 207, 208 have not been drawn in, the contact elements of these embodiments being able to be moved with the control elements 207, 208 described above.

Weiters können bei den in Fig. 5, 6, 8 und 9 dargestellten Ausführungsformen Temperatursensoren vorgesehen sein, wobei hierbei ein Temperatursensor im Innenraum des Kraftfahrzeugscheinwerfers 100 und ein weiterer Temperatursensor in dem Bereich außerhalb des Kraftfahrzeugscheinwerfers 100, an dem das zweite Kühlkörperelement 502, 602, 802, 902 angeordnet ist, angebracht ist. Eine Steuerung vergleicht die von den Temperatursensoren jeweils erfassten Temperaturen, vergleicht diese und verschiebt das jeweilige Kontaktelement 503, 504, 603, 604, 803, 904 über das dem Kontaktelement 503, 504, 603, 604, 803, 904 zugeordnete, in diesen Figuren nicht eingezeichnete Steuerungselement 207, 208 mit Hilfe eines Antriebs, beispielsweise einem Linearmotor oder Balg- und Membranantriebe, sodass nach den oben beschriebenen Temperaturbedingungen Wärmekontakt hergestellt oder unterbunden werden kann. BEZUGSZEICHENLISTE Kraftfahrzeugscheinwerfer 100 Scheinwerfergehäuse 102 Abdeckscheibe 103 Lichtquellen 104,105 Kühlkörpervorrichtung 200 erstes Kühlkörperelement 106, 201, 501, 601, 701, 801, 901, 1001 zweites Kühlkörperelement 107, 202, 502, 602, 702, 802, 902, 1002 Luftspalt 209 Kontaktiervorrichtung 210 erstes Kontaktelement 108, 203, 503, 603, 703, 803, 904, 1003 zweites Kontaktelement 109, 204, 504, 604, 704, 1004 erstes Steuerelement 207 zweites Steuerelement 208 Ausnehmung 205, 206, 505, 506, 511, 512, 606, 612, 705, 706, 712, 805, 806, 906, 1006 Furthermore, with the in Figs. 5 , 6 , 8 and 9 The illustrated embodiments temperature sensors may be provided, with a temperature sensor in the interior of the motor vehicle headlight 100 and a further temperature sensor in the area outside the motor vehicle headlight 100 on which the second heat sink element 502, 602, 802, 902 is arranged. A controller compares the temperatures recorded by the temperature sensors, compares them and shifts the respective contact element 503, 504, 603, 604, 803, 904 via the contact element 503, 504, 603, 604, 803, 904 assigned to the contact element 503, 504, 603, 604, 803, 904, not in these figures Drawn control element 207 , 208 with the help of a drive, for example a linear motor or bellows and diaphragm drives, so that thermal contact can be established or prevented according to the temperature conditions described above. <b> REFERENCE CHARACTERISTICS LIST </b> Automotive headlights 100 Headlight housing 102 Cover panel 103 Light sources 104.105 Heat sink device 200 first heat sink element 106, 201, 501, 601, 701, 801, 901, 1001 second heat sink element 107, 202, 502, 602, 702, 802, 902, 1002 Air gap 209 Contacting device 210 first contact element 108, 203, 503, 603, 703, 803, 904, 1003 second contact element 109, 204, 504, 604, 704, 1004 first control 207 second control 208 Recess 205, 206, 505, 506, 511, 512, 606, 612, 705, 706, 712, 805, 806, 906, 1006

Claims (14)

  1. Motor vehicle headlamp (100) having a headlamp housing (102) and a cover lens (103) and having at least one light source (104, 105) arranged in this motor vehicle headlamp (100), it being possible for the light from the at least one light source (104, 105) to be imaged in the form of a defined light distribution in front of the motor vehicle headlamp (100), and a heat sink device (200) being provided for cooling the at least one light source (104, 105),
    wherein
    the heat sink device (200) comprises two heat sink elements (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002) separated from each other by an air gap (209), which are arranged in such a way that a first heat sink element (106, 201, 501, 601, 701, 801, 901, 1001) is mounted inside the motor vehicle headlamp (100) and a second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002) is mounted outside the motor vehicle headlamp (100), wherein the heat sink device (200) is provided with a contacting device (210), which contacting device (210) comprises a contact element (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) or a plurality of contact elements (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) which enables a heat exchange between the heat sink elements (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002) when the temperature in the interior of the motor vehicle headlamp (100) is higher than the temperature in the area outside the motor vehicle headlamp (100) to which the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002) is attached, wherein the contact element (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) or the contact elements (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) of the contacting device (210) thereby being in simultaneous thermally conductive contact with the first heat sink element (106, 201, 501, 601, 701, 801, 901, 1001) and the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002), characterized in that no heat exchange is possible between the heat sink elements (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002), when the temperature in the interior of the motor vehicle headlamp (100) is lower than the temperature in the region outside the motor vehicle headlamp (100) to which the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002) is attached, in that the contact elements (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) of the contacting device (210) thereby only being in contact with one heat sink element (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002) or no heat sink element (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002).
  2. Motor vehicle headlamp (100) according to claim 1, characterized in that the heat sink elements (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002) are arranged such that the first heat sink element (106, 201, 501, 601, 701, 801, 901, 1001) is placed in heat transfer contact with the at least one light source (104, 105) arranged in the motor vehicle headlamp (100).
  3. Motor vehicle headlamp (100) according to claim 1 or 2, characterized in that the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002)) is arranged outside the motor vehicle headlamp on the side of the headlamp housing facing away from the cover lens, preferably the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002) being positioned in an engine compartment in the installed state of the motor vehicle headlamp (100).
  4. Motor vehicle headlamp (100) according to claim 1 to 3, characterized in that the heat sink elements (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002) are arranged fixed with respect to each other.
  5. Motor vehicle headlamp (100) according to claim 1 to 4, characterized in that the contacting device (210) comprises at least one thermally conductive contact element (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) which is movable with respect to the heat sink elements (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002).
  6. Motor vehicle headlamp (100) according to claim 1 to 5, characterized in that the contacting device (210) comprises a first and a second contact element (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) which allow a heat exchange between the heat sink elements (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002), if the temperature in the interior of the motor vehicle headlamp (100) is higher than the temperature in the region outside the motor vehicle headlamp (100) at which the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002) is mounted, the first contact element (108, 203, 503, 603, 703, 803, 904, 1003) thereby being in simultaneous heat-conducting contact with the first heat sink element (106, 201, 501, 601, 701, 801, 901, 1001) and at the same time via the second contact element (109, 204, 504, 604, 704, 1004) with the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002), and that no heat exchange takes place between the heat sink elements (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002) is possible when the temperature in the interior of the motor vehicle headlamp (100) is lower than the temperature in the region outside the motor vehicle headlamp (100), to which the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002) is attached, in that the contact elements (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) of the contacting device (210) are thereby only in contact with one heat sink element (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002) each, but not with each other.
  7. Motor vehicle headlamp (100) according to claim 5 or 6, characterized in that at least one contact element (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) of the contacting device (210) is located in at least one recess (205, 206, 505, 506, 511, 512, 606, 612, 705, 706, 712, 805, 806, 906, 1006) in at least one heat sink element (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002) in a displaceable manner.
  8. Motor vehicle headlamp (100) according to claim 5 to 7, characterized in that exactly two contact elements (106, 109, 203, 204, 503, 504, 603, 604, 703, 704, 1003, 1004) of the contacting device (210) are mounted in a respective associated recess (205, 206, 505, 506, 511, 512, 606, 612, 705, 706, 712, 805, 806, 906, 1006) in the heat sink elements (106, 107, 201, 202, 501, 502, 601, 602, 701, 702, 801, 802, 901, 902, 1001, 1002).
  9. Motor vehicle headlamp (100) according to claim 5 to 8, characterized in that the contact elements (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004) of the contacting device (210) can be moved by at least one control element (207, 208) assigned to the respective contact element (108, 109, 203, 204, 503, 504, 603, 604, 703, 704, 803, 904, 1003, 1004).
  10. Motor vehicle headlamp (100) according to claim 6 to 9, characterized in that a first control element (207) is associated with the first contact element (108, 203, 503, 603, 703, 803, 904, 1003) and a second control element (208) is associated with the second contact element (109, 204, 504, 604, 704, 1004).
  11. Motor vehicle headlamp (100) according to claim 10, characterized in that the first control element (207) is designed in such a way that, when the temperature in the interior of the motor vehicle headlamp (100) rises, the first contact element (108, 203, 503, 603, 703, 803, 904, 1003) is at least partially pushed out of the associated recess (205, 505, 506, 606, 705, 805, 806, 906) by the first control element (207), so that a thermally conductive contact can be established with the second contact element (109, 204, 504, 604, 704, 1004) or the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002).
  12. Motor vehicle headlamp (100) according to claim 10 or 11, characterized in that the second control element (208) is designed in such a way that, when the temperature rises in the area outside the motor vehicle headlamp (100) to which the second heat sink element (107, 202, 502, 602, 702, 802, 902, 1002) is attached, the second contact element (109, 204, 504, 604, 704, 1004) is retracted further into the associated recess (206, 511, 512, 612, 706, 712, 1006) by the second control element (208), so that heat-conducting contact with the first contact element (108, 203, 503, 603, 703, 1003) or the first heat sink element (106, 201, 501, 601, 701, 801, 901, 1001) can be prevented.
  13. Motor vehicle headlamp (100) according to claim 9 to 12, characterized in that the control elements (207, 208) are procured from a material which expands or contracts depending on the temperature.
  14. Motor vehicle headlamp (100) according to claim 9 to 13, characterized in that the control elements (207, 208) are made of bimetal.
EP17794213.3A 2016-11-17 2017-10-25 Heat sink having variable thermal resistance Active EP3542098B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA51043/2016A AT518977B1 (en) 2016-11-17 2016-11-17 Heat sink with variable thermal resistance
PCT/AT2017/060287 WO2018090067A1 (en) 2016-11-17 2017-10-25 Heat sink having variable thermal resistance

Publications (2)

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EP3542098A1 EP3542098A1 (en) 2019-09-25
EP3542098B1 true EP3542098B1 (en) 2021-12-15

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EP (1) EP3542098B1 (en)
JP (1) JP6893982B2 (en)
KR (1) KR102200885B1 (en)
CN (1) CN109964079B (en)
AT (1) AT518977B1 (en)
WO (1) WO2018090067A1 (en)

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AT518977A4 (en) 2018-03-15
JP6893982B2 (en) 2021-06-23
CN109964079A (en) 2019-07-02
WO2018090067A1 (en) 2018-05-24
EP3542098A1 (en) 2019-09-25
KR20190080913A (en) 2019-07-08
KR102200885B1 (en) 2021-01-12
JP2019536229A (en) 2019-12-12
US20200072435A1 (en) 2020-03-05
US10605429B2 (en) 2020-03-31
AT518977B1 (en) 2018-03-15
CN109964079B (en) 2022-01-11

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