EP2159486A1 - Vorrichtung zur Beleuchtung und/oder Signalisierung für Kraftfahrzeuge, die ein Wärmeleitrohr umfasst - Google Patents

Vorrichtung zur Beleuchtung und/oder Signalisierung für Kraftfahrzeuge, die ein Wärmeleitrohr umfasst Download PDF

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Publication number
EP2159486A1
EP2159486A1 EP09168673A EP09168673A EP2159486A1 EP 2159486 A1 EP2159486 A1 EP 2159486A1 EP 09168673 A EP09168673 A EP 09168673A EP 09168673 A EP09168673 A EP 09168673A EP 2159486 A1 EP2159486 A1 EP 2159486A1
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EP
European Patent Office
Prior art keywords
heat
heat pipe
lighting
light source
housing
Prior art date
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Granted
Application number
EP09168673A
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English (en)
French (fr)
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EP2159486B1 (de
Inventor
Jean-François Le Bars
Boris Wiegand
Pierre Smal
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.)
Valeo Vision SAS
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Valeo Vision SAS
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Publication date
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Publication of EP2159486A1 publication Critical patent/EP2159486A1/de
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Publication of EP2159486B1 publication Critical patent/EP2159486B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • 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]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • 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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/51—Cooling arrangements using condensation or evaporation of a fluid, e.g. heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/71—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
    • F21V29/713—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements in direct thermal and mechanical contact of each other to form a single system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention is in the field of lighting devices for motor vehicles in particular, and more particularly the projectors equipping such vehicles. It relates to a cooling device of a light source equipping the projector, and a projector equipped with such a cooling device.
  • the cooling device of the present invention is more precisely of the type according to which a heat pipe is installed inside a housing of the projector which houses the light source, and which is in relation with heat exchange means, such as a heat sink arranged as a finned radiator or the like.
  • Automotive headlamps are composed in their generality of a housing which is closed by a transparent closure glass through which emerge one or more light beams.
  • This housing houses at least one optical system associating a light source and means for reflecting the light produced by the light source for the emission of the light beam (s).
  • This housing is also capable of accommodating various functional elements, such as mobility means of the optical system, covers limiting the range of one or more light beams emitted by the projector, or even electronic and / or mechanical means of control of the implementation of the various members contained inside the housing, such as the light source and / or a movable actuator of the optical system and / or one or more caches.
  • the reflection means associated with the light source are not examples consisting of at least one reflector and / or a light guide.
  • a heat pipe associated with heat exchange means such as a heat sink arranged as a finned radiator
  • a heat pipe is an extended member capable of conveying calories by conduction from the material constituting it, and / or is arranged in a hermetically sealed conduit capable of conveying a heat-transfer fluid that it contains.
  • the coolant is, for example, water or any other fluid that can be used for heat exchange.
  • the closure of the duct is for example obtained from a closure of its ends, or from a closing of the loop duct on itself.
  • a proximal end of the heat pipe is related to the environment close to the light source to take the heat it produces.
  • the distal end of the heat pipe is in contact with the heat exchange means to evacuate the heat conveyed by the heat pipe.
  • the heat exchange between the heat pipe and the environment close to the light source induces a passage of the coolant in the gas phase, until its cooling in contact with the exchange means thermal with consequent its passage in liquid phase.
  • the heat transfer fluid in the liquid phase is then naturally conveyed by gravity and / or by capillarity along the heat pipe to the environment close to the light source.
  • LEDs Electrode Diodes
  • LEDs may be used for signaling lamps with low light output, or for lights requiring a high luminous intensity, such as for low beam, high beam or fog lights for example.
  • LEDs are light sources with lower power consumption than other types of light sources, such as halogen lamps or incandescent lamps traditionally used in the automotive field.
  • LEDs do not radiate omnidirectionally but more directionally than other light sources.
  • the LEDs are space-saving and can be placed in tight spaces inside the case, the remaining volume of which can be used to house additional accessories.
  • the small size of the LEDs and their directional light radiation can reduce the size and simplify the structure of the optical system, including reflection means.
  • the LEDs produce heat that is desirable to vent out of the housing.
  • the heating of the LEDs is detrimental to their operation, because the more a LED rises in temperature, the more its luminous flux decreases.
  • their heating is likely to affect other sensitive organs housed inside the housing.
  • the structure of the cooling devices operating a heat pipe must be adapted according to the application of the optical system. More particularly when the light source consists of one or more LEDs, it is necessary to adapt the general organization of the cooling device according to the number and the power of the LEDs used for a given optical system. Such an adaptation consists in particular in the organization of the heat pipe mounting means inside the housing, and in its connection with appropriate heat exchange means which offer specifically adapted capacities according to the heat produced by the LEDs. relationship with the heat pipe.
  • the optical system is organized to be constitutive of a traffic light or the like, for which the power required is low.
  • a traffic light or the like
  • the reflection means of the optical system may consist of a light guide cooperating with a reduced number of LEDs.
  • An application of such an optical system resides, for example, in a traffic light emitting a daytime illumination beam of long distance identification of the vehicle.
  • the projector incorporates means for diffusing a satisfactory light, and the LEDs are a light source with low heat production particularly suitable for such an application.
  • the LEDs are supported by a frame being oriented relative to each other in opposite manner, to emit light flows which are respectively oriented at one and the other end of a light guide constituting the reflection means of the optical system.
  • the use of the frame of reduced dimensions, makes it all the more difficult the assembly and the rigorous positioning of the heat pipe inside the housing.
  • there is the problem of linking the heat pipe with the heat exchange means which must be performed with limited space and through the simplest structure possible means. This connection must also avoid affecting the tightness of the projector, without further complicating the structure of the means implemented.
  • the optical system is organized to be constitutive of a fire requiring a high light intensity, such as for low beam, high beam or fog lights for example .
  • the number of LEDs and / or the power required for their operation are higher than for the previous application case.
  • a large number of LEDs and / or LEDs, called power LEDs, generally requiring a high power of operation are likely to be related to the same heat exchange means and / or heat exchange means which are respectively assigned to them, individually or in groups of LEDs.
  • such a high operating power is likely to be between 10 W and 60 W.
  • the assembly of the heat pipe must nevertheless be able to be achieved by means of simple structural elements which are easy to install on the housing and to guarantee an effective maintenance of the heat pipe in position, without affecting its qualities required to have to evacuate the heat. that he drives.
  • the cooling device must be as efficient as possible, reliable and durable, while being simple structure and offering ease of assembly of the various organs that compose it to reduce the costs of obtaining the projector and as a result to make it competitive.
  • the heat exchanges of the heat pipe with the heat exchange means and with the environment close to the light source must be optimized. It must still be taken into account that it is known to place the heat exchange means outside the housing because of the importance of their size, in order to optimize the availability of the interior volume of the housing for accommodate other components essential to the operation of the projector.
  • the arrangement of the heat exchange means outside the housing must not affect the necessary sealing of the housing against moisture and dust, and the cooling device must include in its organization provisions to obtain easily and cheaply such a seal, which must be reliable and durable.
  • the object of the present invention is to provide a lighting and / or signaling device of a motor vehicle comprising a cooling device of at least one light source of the lighting and / or signaling device.
  • Such a device is desired that can be exploited for both a light source of low operating power and high operating power. It is also the object of the present invention to allow such an operating power without inducing a large space requirement or a complex structure of the elements of the device contained inside the housing, nor without compromising the tightness of the projector. In general, it is the object of the present invention to propose that the lighting and / or signaling device best meets all the constraints and problems that have been stated.
  • the object of the present invention is a lighting and / or signaling device for a motor vehicle, comprising a cooling device and at least one light source, the cooling device comprising at least one minus a heat pipe in relation on the one hand at its proximal end with the light source and on the other hand at its distal end with heat transfer means able to evacuate the heat produced by the light source, the heat pipe being held in position at inside a housing of said lighting device and / or signaling between the light source and the heat transfer means through holding means.
  • the holding means comprise at least a first heat-conducting sleeve which is placed inside the casing by wrapping the heat pipe at its distal end.
  • This first sleeve is a dissipating member towards the inside of the housing of the heat that it receives by conduction from the distal end of the heat pipe.
  • This light source is preferably of the type employing one or more LEDs and is constitutive of an optical system in which one or more reflectors or similar member are associated with the light source.
  • Such reflectors are for example arranged at the rear of the light source relative to the mounting direction of the projector on the vehicle, or for example still are light guides receiving at at least one of their ends a luminous flux produced by the light source.
  • the device comprises at least one heat pipe in relation on the one hand at its proximal end with the light source and on the other hand at its distal end with heat transfer means able to evacuate the heat produced by the light source.
  • the heat pipe is held in position inside a projector housing between the light source and the heat transfer means, by means of holding means which are in particular housed at least partly inside the housing.
  • the first sheath is a member which comprises at least partially or entirely the heat transfer means by dissipating inwardly of the housing of the heat that it receives by conduction of the heat pipe.
  • this heat dissipation is optionally supplemented by transmission of the residual heat after dissipation from the first sleeve to heat exchange means which are placed outside the housing and that include if necessary the heat transfer means in complementarity of the first sheath.
  • the first sheath is advantageously provided with a fastening plate or similar fastening member, on a carrier member integral with the housing.
  • This sole preferably integrated in the first sleeve to participate in said heat dissipation, provides an additional heat exchange surface by dissipation between the first sleeve and the air contained inside the housing.
  • a soleplate makes it possible to fix the first sheath on a support member constituted either by a structural element of the casing, such as a wall element or the like, or, if appropriate, on a base in relation to the heat exchange means.
  • connection between the sole and the first sheath can be exploited to interpose between them heat dissipating elements, such as connecting members arranged in fins or the like, allowing the first sheath to increase its capacity to dissipating by dissipation to the inside of the housing the heat it receives by conduction from the distal end of the heat pipe.
  • heat dissipating elements such as connecting members arranged in fins or the like
  • This heat dissipation member placed inside the housing which preferably combines the first sheath, the sole and connecting members between the first sheath and the sole, is of a simple structure that can be easily obtained by folding a sheet, a sheet or a metal plate whose desired thickness is chosen according to its desired conductivity sampling and dissipation of the heat it receives from the heat pipe.
  • This heat dissipation member capable of constituting at least part of the heat transfer means, not only enables the distal end of the heat pipe to be positioned and maintained rigorously inside the housing. without having to cross the wall of the latter, but also allows to evacuate the heat produced by the light source by dissipation of this heat supplied to the distal end of the heat pipe.
  • the heat dissipating member is particularly usable in isolation in the case where the heat to be discharged is low.
  • Such a case corresponds to an application of the device to the evacuation of the heat produced by a light source with low operating power, such as constituted by one or more LEDs whose overall operating power does not exceed 6 W, up to 8 W.
  • the carrier member consists of a structural element of the housing, such as a wall element or a thermally conductive intermediate element interposed between the sole and the housing.
  • the carrier member is arranged in thermally conductive base junction between the holding means, and more particularly the first sleeve, with heat exchange means implanted outside the housing.
  • the base is a sealing member of a window formed through the wall of the housing. This window is dedicated to authorizing the connection between the heat exchange means and the holding means of the distal end of the heat pipe, first sheath in particular.
  • the mounting of the first sleeve inside the housing is simple and easy, and the sealing of the housing is completely preserved, because of the absence of crossing its wall by the heat pipe and / or the means used to maintain its distal end inside the housing.
  • the base is an intermediate member between the holding means and the heat exchange means for their mechanical and thermoconductive connection. The base makes it possible to position and facilitate the mounting of the first sleeve inside the housing in the case where the use of heat exchange means placed outside the housing is necessary.
  • the base whose extended surface is adapted to receive a said surface sole adapted to the needs, also facilitates the connection by heat conduction between the first sleeve and the heat exchange means.
  • the base is advantageously provided with fastening means of the sole, and a flange or like bearing member against the outer face of the wall of the housing.
  • the arrangement of the carrier member collar base allows its easy interposition between the heat exchange means and the first sleeve.
  • the flange allows the installation of a compressible sealing member interposed between the base and the wall of the housing.
  • the tightness of the housing of the projector is preserved reliably and perennially, including in the case where the carrier member, arranged in base, is likely to pass through the wall of the housing.
  • the fastening means of the sole on the carrier member are indifferently of the type by riveting, by interlocking cooperating members, by means of removable fasteners, and / or by sealing with a conductive material of heat.
  • the arrangement and the conformation of the carrier member, such as in base or the like integrated with the heat exchange means, have the advantage of conferring on it a simple structure and of allowing easy implantation of the heat exchange means to the outside of the case.
  • the connection between the heat pipe and the heat exchange means is also obtained from a simple structure combining the first sheath, preferably provided with the first sole and connecting members, and the base on which this sole is fixed. .
  • this cooling device comprises a member for dissipating the inside of the heat transmission unit transmitted to the first sleeve by the distal end of the heat pipe.
  • This heat dissipation member advantageously associates at least the first sheath wrapping the distal end of the heat pipe, a sole plate for fixing the first sheath to a carrier member secured to the housing, and junction members between the sole and the first sheath capable of forming fins or similar heat dissipating members; from the first sheath.
  • Such a heat dissipating member is adapted to provide its rigorous maintenance function in position of the distal end of the heat pipe inside the housing, as well as its function of heat dissipation towards the inside of the heat box. from the distal end of the heat pipe.
  • This dual function of the heat dissipating member is obtained either alone or in combination with the heat exchange means, without having to modify its structure or to have it pass through the wall of the housing to preserve the quality of its sound. seal.
  • the heat dissipating member is able to be operated in isolation, in particular for the evacuation of heat produced by a light source of low power of the order of 6 W, in connection with the heat exchange means for heat removal produced by one or more power LEDs.
  • these are arranged in fins radiator or similar member for heat dissipation outside the housing from an optimization of its contact surface with the ambiant air.
  • these consist of a conduit carrying a refrigerant fluid.
  • the refrigerant fluid is likely to be a gas, in particular air, or a heat transfer liquid, which are previously cooled by a cold generating apparatus equipping the vehicle, such as an apparatus constituting a ventilation, heating and / or or air conditioning.
  • the refrigerated air is likely to be taken from a constituent distribution of said installation.
  • the coolant liquid may be taken from an air conditioning loop constituting said installation.
  • the cooling device preferably comprises a heat dissipating member which associates at least the first sheath enveloping the distal end of the heat pipe, the sole of attachment of the first sheath to a carrier member integral with the casing, and junction members between the soleplate. and the first sheath.
  • These connecting members are able to form fins for dissipating heat from the first sheath.
  • the first sheath, the sole and the associated connecting members form the means for holding the heat pipe.
  • the structure of these holding means is axially extended for a given transverse dimension of the first sheath corresponding to that of the distal end of the heat pipe.
  • the heat exchange surface between the holding means and the distal end of the heat pipe may advantageously be optimized by increasing the surface area of the holding means, and in particular by increasing the area between the first sheath and the distal end of the heat pipe. .
  • the heat dissipation capacity of the holding means can be easily optimized not only from such an increase in heat exchange area between the holding means and the heat pipe, but also by an increase in the surface area of the connecting and connecting members. the sole. Such an optimization is obtained in particular by increasing the axial dimension of the first sheath, or even possibly the connecting members and the sole.
  • the adjustment of the heat dissipation capacity by the holding means can be easily performed as needed without significant structural modification of the holding means.
  • the heat exchange surface between the holding means and the heat pipe is advantageously adjustable according to needs from a transversal optimization of the peripheral contact surface between the distal end of the heat pipe with the first sheath, and from a selective determination of the axial extension of the first sheath around the distal end of the heat pipe.
  • transverse dimension any dimension orthogonal to the axial extension of the heat pipe, and therefore the first sheath, being also understood that said axial reference extension is that corresponding to the heat pipe.
  • the transverse dimension of the first sheath to be considered is oriented along its diameter.
  • the first sheath it is arranged in a tube inside which is housed the distal end of the heat pipe.
  • the soleplate is for example arranged in a radially median plane of the first sheath.
  • a clearance is likely to be provided inside the base for the at least partial passage of the first sleeve and the sole for their attachment and their contact with the base.
  • the first sheath is likely to be composed of two half-shells which are assembled to one another and which jointly envelop the distal end of the heat pipe.
  • Such an arrangement of the first sleeve allows an easy radial introduction of the heat pipe inside a first of the half-shells, the second half-shell then being assembled to the first half-shell by capping the heat pipe.
  • the assembly of the half-shells between them is advantageously achieved by means of sole elements that they respectively comprise.
  • the tube arrangement of the first sheath is also likely to be structurally exploited to obtain said heat dissipating member.
  • the constituent tube of the first sleeve is connected to the sole via the connecting members.
  • the first sheath it is arranged as an elastically deformable clamp and comprising jaws, said clamp being adapted to grip the outer wall of the distal end of the heat pipe.
  • Mounting the heat pipe on the first sheath allows the desired optimization of the heat exchange surface between the heat pipe and the first sheath, while allowing a quick, easy and reliable installation of the heat pipe inside the housing.
  • the jaws of the clamp which together form the first sheath, are preferably two in number and are of hemicylindrical conformation.
  • the introduction into force of the heat pipe inside the first sheath is carried out with balanced efforts promoting the guiding of the distal end of the heat pipe to the first sheath.
  • the first sleeve radially envelops the distal end of the heat pipe over almost all of its periphery with the advantage of optimizing the heat exchange between them.
  • the jaws of the clamp are extended by outwardly flared returns, which are adapted to promote the guiding and the force introduction of the heat pipe by an operator between the jaws of the clamp.
  • a comfortable pushing force for the operator is of the order of between 500 g and 3 kg.
  • Such a thrust force is also able to satisfactorily immobilize the heat pipe, making it possible to avoid any movement of the heat pipe likely to lead to a degradation of the quality of the thermal contact.
  • the arrangement of the first clamp sleeve extended by the connecting members to the sole allows obtaining the heat dissipating member at lower costs.
  • the clip is adapted to be easily obtained by cutting and folding and / or deformation of a sheet, sheet or plate of metal.
  • the heat dissipation provided by the heat dissipating member of which the first sheath is arranged as a clamp is satisfactory so as not to affect the operation of the projector, especially in an application of the cooling device to the heat evacuation. from a light source with low operating power.
  • the operation of such a heat dissipation member facilitates the easy assembly of the heat pipe and its firm holding in a strictly determined position, while providing the desired heat dissipation towards the inside of the housing at a tolerable threshold for a light source. whose operating power is low, indicatively between 1 Watts and 6 Watts.
  • the clamp can be easily assembled to the base via the sole, and be easily exploitable for quick and easy assembly of the distal end of the heat pipe.
  • the organization of the holding means proposed by the present invention allows to arrange them for the positioning and cooling of a plurality of heat pipes in particular assigned to a respective light source.
  • first sleeves are assigned to a respective heat pipe being attached to the same carrier member.
  • the different first sleeves may be interconnected by the same sole which is common to them, forming an assembly comprising means for maintaining a plurality of heat pipes.
  • the holding means are adapted to be adapted without substantial structural modification for the reception of a plurality of heat pipes particularly assigned to the cooling of respective light sources.
  • the exchange surfaces between the first sleeves and the distal ends of the heat pipes they receive respectively can be freely and easily adapted according to the specific needs for different light sources, without impairing the necessary exchange surfaces between the other first sleeves and the distal ends of the corresponding heat pipes.
  • the methods of mounting the first sleeves on the carrier member are unchanged regardless of the number of first sleeves constituting means of maintenance, or even are facilitated when the first sleeves are gathered in one set via a common sole.
  • the holding means also preferably comprise at least one second heat-conducting sleeve which wraps the end proximal of the heat pipe and which is integrated with a frame for holding the light source and at least one light guide associated with this light source.
  • a holding frame has an optimized surface for taking the heat produced by the light source.
  • the holding frame integrates the second sleeve, and is in close relationship with the environment close to the light source it envelopes to take the heat produced by the light source during operation.
  • the chassis is associated with a thermally conductive element which carries the light source and envelops its surrounding environment to collect and transmit by conduction the heat produced by the light source to the second sheath.
  • the carrier element of the light source is assembled and / or integrated into the chassis in a direction orthogonal to the general extension of the proximal end of the heat pipe.
  • the chassis is arranged as a tunnel for receiving the carrier element of the light source, its connection connector to the electrical circuit of the vehicle, and the light guide.
  • the second sleeve is laterally extended by the frame, which has side walls and a cover wall surrounding the light source carrying member.
  • the frame and / or the carrier element of the light source are advantageously each made by cutting and folding and / or deformation of a piece of metal, such as a sheet, a sheet or a plate whose thickness is chosen according to the desired heat extraction capabilities according to the operating power of the light source.
  • the frame and / or the carrier element comprise for at least one of them claws or similar members for fixing the frame and the carrier element to one another.
  • the means for maintaining and relating the proximal end of the heat pipe to the environment close to the light source are obtained at lower cost for taking the heat produced by the light source and conduction of this heat to the light source.
  • proximal end of the heat pipe which are optimized.
  • the proposed arrangement of the cooling device allows various applications of the cooling device without significant changes in its structure. More particularly, the cooling device proposed in the present invention allows its application for any lighting and / or signaling devices, and in particular regardless of the operating power of the light source or sources that these lighting devices comprise. and / or signaling.
  • the lighting and / or signaling device is a signaling device, the light source consisting of at least one LED and whose overall operating power is between 1 Watts and 6 Watts,
  • the dissipation of the heat produced and to be discharged can be carried out in isolation by the holding means of the distal end of the heat pipe, in particular arranged as a dissipation member heat to the inside of the case.
  • the traffic light is likely to be a DRL (Decline Day Time Running Light).
  • the lighting and / or signaling device may also be a lighting module of a projector, the light source being composed of at least one power LED, the overall operating power of which is between 20 Watts and 50 Watts.
  • a lighting light is for example a short range fire, such as code light or fog lamp, or a long range light such as a high beam.
  • the operating power of the light source being important, the axial extension characteristics of the sleeves, or even the heat dissipating member as a whole, are easily adaptable without complicating their structure.
  • the member for dissipating heat and maintaining the distal end of the heat pipe is preferably in connection with the heat exchange means implanted outside the housing.
  • a cooling device is intended to equip a projector of a motor vehicle. More particularly, this device is intended for cooling the light source 1 of an optical system 2 housed inside a housing 3 of the projector.
  • the system Optical 2 is arranged for projection of a daytime running light.
  • This optical system 2 associates in particular a pair of LEDs which are carried by a frame 4 and which are oriented at the end of an annular conforming light guide 5.
  • the cooling device comprises a heat pipe 6 whose proximal end 7 is in relation with the environment close to the LEDs to take the heat released by the light source 1 that they compose. Such a connection is in particular carried out via the frame 4.
  • the distal end 8 of the heat pipe 6 is connected with heat transfer means for discharging at its distal end 8 the heat which it conveys, after removal of this heat at its proximal end 7.
  • the heat transfer means comprise a first sleeve 10 which surrounds the distal end 8 of the heat pipe 6.
  • These heat transfer means constitute means for holding the heat pipe 6 inside the housing via its distal end 8
  • the first sheath 10 constitutes not only means for holding the heat pipe 6 inside the casing 3, but also means for dissipating the inside of the casing 3 from the heat that it receives from the distal end. 8 of the heat pipe 6.
  • the first sleeve 10 is provided with a sole 11 for attachment to a carrier member 12.
  • the carrier member 12 consists of a structural element 13 constituting the housing 3 , or in a similar manner to any member integral with the housing 3.
  • the axial extension of the first sleeve 10 makes it possible to reinforce the maintenance of the heat pipe 6, and to optimize the heat exchange between the distal end 8 of the heat pipe 6 and the first sleeve 10.
  • the first sleeve 10 and the sole 11 are connected to one another by means of junction members 14, which are arranged in fins capable of increasing the dissipation inside.
  • the assembly comprising the first sheath 10, the junction members 14 and the sole 11 is generally a heat dissipating member 9.
  • the first sheath 10 is arranged in a clip 16 elastically deformable, adapted to grip the outer wall of the distal end of the heat pipe 6.
  • the jaws of the clamp 16 constituting the first sheath 10 are extended by returns 17 flared outwardly.
  • the fig.4 and fig.5 represent an alternative embodiment of the holding means of the distal end 8 of the heat pipe 6.
  • the sole 11 equipping the first sleeve 10 is used for fixing the clamp 16 on a carrier member 12 arranged in thermally conductive base 18.
  • the extension transverse of the sole 11 is optimized, to promote the heat exchange between the first sleeve 10 and the thermoconductive base 18.
  • This heat conductive base 18 is in relation, or is integrated, with heat exchange means 19 formed on the example embodiment shown by a finned radiator 20.
  • These heat exchange means 19 are placed outside the housing 3 to remove the heat from the sole 11 out of the housing 3.
  • a window 21 is formed through the wall 22 of the housing 3.
  • thermoconductive base 18 is provided with a collar 23 constituting a base for the heat exchange means 19.
  • a peripheral seal 24 of the edge of the window 21 is interposed between the flange 23 and the outer face of the wall 22 of the housing 3. This peripheral seal 24 is able to be compressed during assembly of the heat exchange means 19 outside the housing 3, by application against the wall 22 of the housing 3.
  • the heat transfer means associates the heat dissipating member 9 composed of the first sheath 10, the sole 11 and the connecting members 14, the thermoconductive base 18 and the heat exchange means 19.
  • the heat fed to the distal end 8 of the heat pipe 6 is transmitted by conduction to the first sheath 10, then to the sole 11 by means of the junction members 14, then to the thermoconductive base 18, then finally to the heat exchange means 19.
  • thermoconductive base 18 also has the advantage of allowing a plurality of heat pipes 6 to be brought into contact with the heat exchange means 19 placed outside the housing 3.
  • two heat pipes 6 are assigned to a respective light source, not shown on the fig.2 to fig.6 and their distal ends 8 are each wrapped by respective first sleeves 10.
  • Each of these first sleeves 10 is fixed on the thermoconductive base 18 via the sole 11 which they are respectively provided.
  • the holding means of the distal end 8 of the heat pipe 6 are likely to include a sole 11 carrying a plurality of first sleeves 10 assigned to respective heat pipes 6.
  • the soleplate 11 is for example fixed to the thermoconductive base 18 by means of interlocking members, but other fastening means may be envisaged.
  • the simplicity of the connection structure between the distal end 8 of the heat pipe 6 and the holding means included in the heat transfer means makes it possible to easily implement any means of attachment between the soleplate 11 and the thermoconductive base. 18.
  • the first sleeve 10 which comprises the holding means is arranged in tube, inside which is housed the distal end 8 of the heat pipe 6.
  • the sole 11 is disposed in a radially central plane of the first sleeve 10.
  • the tube is may be composed of two half-shells assembled together, to facilitate mounting of the distal end 8 of the heat pipe 6 inside the first sheath 10.
  • the holding means which combine in particular the first sleeve 10 and the first sole 11, are fixed on a thermoconductive base in relation to heat exchange means 19, in the manner of the embodiment shown in FIG. fig.4 .
  • the device is used for the cooling of LEDs 27 used in association with one or more light guides 5.
  • a frame 26 constitutes a second sleeve 28 that comprises the holding means of the device.
  • This frame 26 is associated with a thermoconductive element 30, 32 carrying one or more LEDs 27 and the light guide or guides 5 assigned to them.
  • the frame 26 is arranged to constitute a sampling body by conduction of the heat produced by the light source 1.
  • thermodonductive element 30 is disposed in an orientation orthogonal to the general extension of the proximal end of the heat pipe 6 maintained by the chassis 26 constituting the second sleeve 28.
  • the axial extension of the second sleeve 28 constituted by the frame 26 is of the order of 3.5 cm, for a width of about 1 cm and a height of about 1 cm.
  • the thermally conductive element 30 is in turn substantially constituted by a stop cube of the order of 1 cm.
  • the frame 26 and the thermoconductive element 30 have a surface of the order of 18 cm 2 to 20 cm 2 and ideally behave like a radiant emissivity body with a coefficient of 0.8, capable of discharging 0.42 W for a temperature rise of 40 ° C, ie a thermal resistance of the order of 100 ° C / W.
  • the heat pipe 6 is capable of corresponding to a maximum thermal resistance of the order of 0.5 ° C / W.
  • the first sleeve 10 has an axial extension of the order of 3.5 cm to enclose the periphery of the distal end 8 of the heat pipe 6. The heat transfer occurs naturally by conduction between the heat pipe 6 and the sleeves 28, 10, the thermal grease being preferentially interposed between the sleeves 28,10 and the corresponding ends 7,8 of the heat pipe 6. The heat transfer between the sleeves 28,10 and the corresponding ends 7,8 of the heat pipe 6 are obtained on a surface of the order of 120 cm 2 .
  • the heat dissipation from the distal end 8 of the heat pipe 6 via the first sleeve 10 is of the order of 2.5 W for a temperature rise of the order of 30 ° C, ie a thermal resistance of 12 ° C / W.
  • the second sleeve 28 is integrated in the frame 26 being formed by rolling a sheet, a plate, a sheet of metal or the like material.
  • the second sleeve 28 is extended by the frame 26, which is folded on itself to form a tunnel 31.
  • the tunnel arrangement 31 of the frame 26 gives it the ability to receive the carrier element 32 of the light source 1 , its connector 33 and one or more light guide, not shown.
  • the frame 26 comprises, by cutting and folding, claws 34 for holding the carrying member 32.
  • the heat transfer from the light source 1 to the heat pipe 6 is optimized from the tunnel arrangement 31 of the frame 26, which envelops the carrier member 32.
  • the heat removal is optimized, and its conduction to the second sleeve 28 is favored by the integration of the frame 26 and the second sleeve 28 in the same piece of metal.
  • the heat pipe holding means 6 are used to connect the distal end 8 of the heat pipe 6 with heat transfer means.
  • These heat transfer means are likely to be constituted by the holding means of the heat pipe 6 by its distal end only, which are formed by a heat dissipating member 9 associating the first sheath 10, the connecting flanges 14 and the sole 11.
  • This heat dissipating member 9 is adapted to be fixed on any carrier member 12 located inside the housing 3, and in particular a structural element 13 of its wall 22.
  • the heat transmitted to the first sleeve 10 through the distal end 8 of the heat pipe 6 is dissipated inside the housing 3.
  • Such a structure of the cooling device is rather adapted to the evacuation of heat from the heat pipe 6, the proximal end of which 7 is in connection with a light source 1 with low operating power comprising one or more LEDs.
  • the heat transfer means are also capable of associating the heat dissipating member 9 and heat exchange means 19 placed outside the housing 3.
  • the means for holding the heat pipe through its distal end 8 forming heat transfer means by conduction of heat from the distal end 8 of the heat pipe 6 to the first sleeve 10, then to the sole 11 of attachment of the heat dissipating member 9 on a thermoconductive base 18 in relation to heat exchange means 19 fixed outside the housing 3.
  • the base 18 constitutes a shutter member of a window 21 formed through the wall 22 of the housing 3, to allow the connection both by mechanical fixing and thermal transfer by conduction, between the holding means consisting of the heat dissipating member 9 and the means
  • This type of structure of the cooling device is rather adapted to the evacuation of the heat coming from the distal end 8 of the heat pipe 6, whose proximal end 7 is in relation with a light source 1 to high operating power, in particular consisting of one or more power LEDs.
  • thermoconductive base 18 to carry the holding means also makes it possible to use a plurality of holding means respectively assigned to heat pipes 6 for cooling respective light sources 1, and to allow heat transfer between the distal end 8 the heat pipe 6 and the heat exchange means 19 without significant modification of the holding means assigned to each of the heat pipes 6.
  • the arrangement at least of the first sheath 10 gripping 16 resiliently gripping the periphery of the corresponding end of the heat pipe 6 according to a determined axial extension allows for the holding means heat pipe 6 at lower cost.
  • This clamp 16 can effectively maintain the heat pipe 6 in position inside the housing.
  • This clamp 16 also allows the adjustment of its axial extension in a simple and inexpensive way, to finally allow to adjust its heat dissipation capabilities according to the heat transmitted by the distal end 8 of the heat pipe 6.
  • This clamp 16 also makes it possible to connect the first sheath 10 and the soleplate 11 by junction members 14 shaped as heat dissipating fins optimizing the intrinsic faculty of the heat dissipating member 9 to remove heat from the distal end 8 of the heat pipe 6 towards the interior of the housing 3.
  • the heat dissipating member 9, comprising the clamp 16 connected to the soleplate 11 by means of the connecting members 14, can be shaped and / or arranged freely and easily at lower costs, by folding a sheet of metal in particular.
  • the arrangement of the first sheath 10 clamp 16 allows easy attachment through the sole 11 which it is provided on any carrier member 12, see a heat-conducting base 18 or the like arranged to be reported externally housing 3 without compromising the tightness of the latter.
  • the clamp arrangement 16 of the first sheath 10 also facilitates the mounting of the device within the housing 3, and more particularly the assembly of the heat pipe 6 and the retaining means of its distal end 8 , in the presence or absence of the heat exchange means 19.
  • the structure of the heat dissipating member 9 in one piece allows the adaptation of the heat pipe holding means 6 according to the required characteristics of thermal resistance and / or dissipation heat sought inward of the housing 3, without significant changes in the structure of the device and lower costs.
  • the arrangement of the means for holding the ends of the heat pipe 6 in ducts makes it possible to easily adapt the heat transfer capacity of the heat pipe 6 with the heat exchange means and the light source 1 respectively.
  • the capacity of the assembly members that comprise the holding means to dissipate heat from the distal end 8 of the heat pipe 6 inside the housing 3 can be easily adapted.
  • This adaptation is obtained in particular by varying the axial extension of the sleeves 10,26 in relation to the corresponding ends 7,8 of the heat pipe 6, according to the specific needs and more particularly according to the operating power of the light source 1 whose heat is to evacuate.
  • the conduction ability of each of these holding means can be adapted specifically and independently depending on the heat pipe that is assigned to them.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
EP09168673A 2008-09-01 2009-08-26 Vorrichtung zur Beleuchtung und/oder Signalisierung für Kraftfahrzeuge, die ein Wärmeleitrohr umfasst Active EP2159486B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0804796A FR2935461B1 (fr) 2008-09-01 2008-09-01 Dispositif d'eclairage et/ou de signalisation de vehicule automobile comprenant un caloduc

Publications (2)

Publication Number Publication Date
EP2159486A1 true EP2159486A1 (de) 2010-03-03
EP2159486B1 EP2159486B1 (de) 2011-10-19

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EP09168673A Active EP2159486B1 (de) 2008-09-01 2009-08-26 Vorrichtung zur Beleuchtung und/oder Signalisierung für Kraftfahrzeuge, die ein Wärmeleitrohr umfasst

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EP (1) EP2159486B1 (de)
AT (1) ATE529697T1 (de)
FR (1) FR2935461B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014217043A1 (de) * 2014-08-27 2016-03-03 Volkswagen Aktiengesellschaft Kraftfahrzeug-Beleuchtungsvorrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004127782A (ja) 2002-10-04 2004-04-22 Ichikoh Ind Ltd 車両用灯具および灯火装置
WO2006052022A1 (en) 2004-11-12 2006-05-18 Showa Denko K.K. Automotive lighting fixture and lighting device
JP2006164967A (ja) * 2004-11-12 2006-06-22 Showa Denko Kk 車両用灯具及び灯火装置
DE202006019381U1 (de) * 2006-12-22 2007-02-22 Lin, Chun-Hen, Shulin City Wassergekühlte Wärmeableitevorrichtung für Fahrzeuge
DE102007028301A1 (de) * 2007-06-20 2007-12-13 Daimlerchrysler Ag Fahrzeugscheinwerfer mit Halbleiterlichtquelle
EP1881262A1 (de) 2006-07-21 2008-01-23 Valeo Vision Beleuchtungsvorrichtung mit Elektrolumineszenzdioden, die mit einem Außenkühlungssystem ausgerüstet ist
US20080247177A1 (en) * 2007-02-09 2008-10-09 Toyoda Gosei Co., Ltd Luminescent device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004127782A (ja) 2002-10-04 2004-04-22 Ichikoh Ind Ltd 車両用灯具および灯火装置
WO2006052022A1 (en) 2004-11-12 2006-05-18 Showa Denko K.K. Automotive lighting fixture and lighting device
JP2006164967A (ja) * 2004-11-12 2006-06-22 Showa Denko Kk 車両用灯具及び灯火装置
EP1881262A1 (de) 2006-07-21 2008-01-23 Valeo Vision Beleuchtungsvorrichtung mit Elektrolumineszenzdioden, die mit einem Außenkühlungssystem ausgerüstet ist
DE202006019381U1 (de) * 2006-12-22 2007-02-22 Lin, Chun-Hen, Shulin City Wassergekühlte Wärmeableitevorrichtung für Fahrzeuge
US20080247177A1 (en) * 2007-02-09 2008-10-09 Toyoda Gosei Co., Ltd Luminescent device
DE102007028301A1 (de) * 2007-06-20 2007-12-13 Daimlerchrysler Ag Fahrzeugscheinwerfer mit Halbleiterlichtquelle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014217043A1 (de) * 2014-08-27 2016-03-03 Volkswagen Aktiengesellschaft Kraftfahrzeug-Beleuchtungsvorrichtung

Also Published As

Publication number Publication date
FR2935461A1 (fr) 2010-03-05
ATE529697T1 (de) 2011-11-15
EP2159486B1 (de) 2011-10-19
FR2935461B1 (fr) 2014-10-17

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