JP2014065339A - Head lamp for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head lamp for a motorcycle such that a plurality of radiation fins can be increased in strength.SOLUTION: A head lamp for a motorcycle is molded integrally including a first base part 38 fitted with a low-beam optical system, a second base part 40 fitted with a high-beam optical system, a plurality of radiation fins 44a, 44b, and 44c which are arranged at predetermined intervals in a vehicle-width direction with the first base part and second base part, and a third base part 42, and connecting the first base part and/or second base part, and the third base part, and a bottom surface 66 which closes a lower-end opening of at least one cylinder part 64 having four sides surrounded with the first base part and/or second base part, the third base part, and the plurality of radiation fins. The head lamp for the motorcycle includes an aiming mechanism which supports a common heat sink which radiates heat generated by first and second semiconductor light emitting elements for cooling inclinably to a housing, and at least the first and second base parts, the plurality of radiation fins, and the bottom surface are arranged in a lamp room.

Description

  The present invention relates to a motorcycle headlamp, and more particularly to a motorcycle headlamp using a semiconductor light emitting element.

  Conventionally, in the field of motorcycle headlamps, a headlamp using a semiconductor light emitting element has been proposed (see, for example, Patent Document 1).

  As shown in FIG. 26, a motorcycle headlamp 200 described in Patent Document 1 includes a light cover 210 and a pedestal 230 that forms a lamp chamber 220 in combination with the light cover 210. Accommodates a so-called projector-type optical system including the LED 240, the reflector 250, and the lens 260. Outside the lamp chamber 220, a heat sink 270 (a plurality of heat radiating fins) that radiates and cools the heat generated by the LEDs 240 is fixed to the pedestal portion 230 with screws.

  In the motorcycle headlamp 200 having the above configuration, since the heat sink 270 (a plurality of heat radiation fins) is provided outside the lamp chamber 220, the heat sink 270 (a plurality of heat radiation fins) is provided inside the lamp chamber 220; In comparison, the heat generated by the LED 240 can be efficiently radiated and cooled. In general, the heat sink is integrally formed by supplying a molten aluminum alloy into a cavity formed by combining dies (see, for example, Patent Document 2).

JP 2010-1225897 A JP 2011-1000067 A2

  However, in the motorcycle headlamp 200 configured as described above, since the plurality of radiating fins are arranged at predetermined intervals in the vehicle width direction, the strength of the plurality of radiating fins is weak, and is easily damaged or deformed. There's a problem.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a motorcycle headlamp capable of increasing the strength of a plurality of heat dissipating fins.

  In order to achieve the above object, according to a first aspect of the present invention, in a motorcycle headlamp, an outer lens, a housing that is combined with the outer lens to form a lamp chamber, a first lens, and the first lens are provided. A first semiconductor light emitting element that emits direct light that is transmitted forward through the lens and the outer lens, a low beam optical system disposed in the lamp chamber, a second lens, and the second lens A high-beam optical system disposed in the lamp chamber, and the low-beam optical system is attached to the second semiconductor light-emitting element. The first base part, the second base part to which the high beam optical system is attached, and the position shifted to the vehicle rear side from the first base part and the second base part A plurality of radiating fins arranged at a predetermined interval in the vehicle width direction and connecting between the first base part and / or the second base part and the third base part, with the arranged third base part And a bottom surface that closes a lower end opening of at least one cylindrical portion surrounded on all sides by the first base portion and / or the second base portion, the third base portion, and the plurality of radiating fins. And a common heat sink that radiates and cools the heat generated by the first semiconductor light emitting element and the second semiconductor light emitting element, and an aiming mechanism that supports the common heat sink so as to be tiltable with respect to the housing And at least the first base portion, the second base portion, the plurality of radiating fins, and the bottom surface are disposed in the lamp chamber.

  According to the first aspect of the present invention, the following advantages are obtained.

  First, it is possible to increase the strength of the plurality of radiating fins. This is because a plurality of heat dissipating fins are connected to the first base part and / or the second base part and the third base part to form at least one cylindrical part surrounded by four sides, and the lower end opening of the cylindrical part This is because the bottom is closed and reinforced.

  Secondly, it is possible to efficiently dissipate heat generated in the semiconductor light emitting element (for example, LED) and cool it. This is because the lower end opening of at least one cylindrical portion is closed with the bottom surface to increase the heat conduction path.

  Third, when a molten aluminum alloy is supplied into a cavity formed by combining molds and a common heat sink is formed, the molten aluminum alloy can be spread all over the cavity. . As a result, a common heat sink can be formed into a designed shape. This is because the cavity portion corresponding to the closed bottom surface functions as a passage for the molten aluminum alloy by closing the lower end opening of at least one cylindrical portion with the bottom surface. The inventors of the present application confirmed this by experiment.

  According to a second aspect of the present invention, in the first aspect of the present invention, upper and lower two vent holes communicating with the lamp chamber are formed on the back surface of the housing, and the two vent holes are respectively The vent hole is closed by a breathing cap, and the lower vent hole of the two vent holes is formed at a position below the bottom surface in the vertical direction.

  According to the second aspect of the present invention, it is possible to cool the low beam optical system and the high beam optical system (particularly, the first lens and the second lens). This is because a part of the outside air that has flowed into the lamp chamber from the lower vent hole is allowed to flow along the bottom surface and the low beam optical system (and the high beam) by the action of the bottom surface that closes the lower end opening of at least one cylindrical portion. This is due to the occurrence of convection that goes to the space between the optical system and the optical system, rises through the space, and flows out of the lamp chamber through the upper vent hole.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, at least one vent hole penetrating in the vertical direction is formed in the bottom surface.

  According to the third aspect of the present invention, the heat generated in the semiconductor light emitting element (for example, LED) can be dissipated more efficiently and cooled. This is because part of the outside air that has flowed into the lamp chamber from the lower ventilation hole is formed on the bottom surface by the action of at least one ventilation hole formed on the bottom surface that closes the lower end opening of the at least one cylindrical portion. This is due to the occurrence of convection that rises through the inside of the tube from the vent hole (chimney effect) and flows out of the lamp chamber from the upper vent hole.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the headlamp for motorcycles which can raise the intensity | strength of a several radiation fin.

1 is a side view of a motorcycle equipped with a motorcycle headlamp according to an embodiment of the present invention. 1 is a front view of a motorcycle equipped with a motorcycle headlamp. FIG. It is a front view of a headlamp. It is a perspective view (outer lens, housing, and extension omitted) of a headlamp. It is a perspective view (outer lens, housing abbreviation) of a headlamp. It is EE sectional drawing of the headlamp shown in FIG. It is AA sectional drawing of the headlamp shown in FIG. It is a rear view of a headlamp. FIG. 3 is a perspective view of a headlamp (outer lens, housing, extension, first lens, and second lens omitted). It is a front view of 28 A of 1st light sources (2nd light source 28B). It is a perspective view of a heat sink. (A) Top view of heat sink, (b) BB sectional view of the heat sink shown in FIG. It is an expansion perspective view near the 1st opening. 12B is a cross-sectional view of the heat sink shown in FIG. 12A (including the first light source 28A), and FIG. 12B is a cross-sectional view of the heat sink shown in FIG. 12A taken along line BB (the first light source 28A and the coupler 56). Included). FIG. 3 is a perspective view of the headlamp (outer lens, first lens, second lens, extension omitted). It is a perspective view of a coupler. It is sectional drawing for demonstrating the engagement relation of a coupler and a 1st light source. It is CC sectional drawing of the headlamp shown in FIG. FIG. 4 is a DD sectional view of the headlamp shown in FIG. 3. It is a perspective view (modification) of a heat sink. It is DD sectional drawing (modification) of the headlamp shown in FIG. It is a back perspective view of a headlamp. (A) The figure for demonstrating the problem in the case of shape | molding a heat sink by supplying the molten metal of aluminum alloy in the cavity comprised combining the metal mold | die containing the metal mold | die with a perpendicular direction (drawing direction) (front view) ), (B) It is a figure (front view) for demonstrating that the problem shown to Fig.23 (a) was improved. It is a figure for demonstrating a problem in case the lower end opening of a some cylinder part is not obstruct | occluded by the bottom face. It is a front view of a heat sink. It is an expansion perspective view of a base part (86a). It is a rear view of a headlamp. It is a figure for demonstrating arrangement | positioning of the conventional power supply circuit. It is a longitudinal cross-sectional view of the headlamp for motorcycles using the conventional semiconductor light-emitting device.

  Hereinafter, a motorcycle headlamp according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view of a motorcycle equipped with a motorcycle headlamp according to an embodiment of the present invention, and FIG. 2 is a front view of the motorcycle equipped with a motorcycle headlamp.

  A motorcycle headlamp 10 (hereinafter simply referred to as a headlamp 10) according to the present embodiment is a lamp unit that irradiates the front (traveling direction) of a motorcycle. As shown in FIGS. It is arrange | positioned at the right and left of the part, respectively.

  The headlamp 10L arranged on the left side and the headlamp 10R arranged on the right side are symmetrical and have substantially the same configuration. For this reason, the headlamp 10L disposed on the left side will be mainly described below, and the description of the headlamp 10R disposed on the right side will be omitted.

  3 is a front view of the headlamp, FIG. 4 is a perspective view of the headlamp (outer lens, housing, and extension omitted), FIG. 5 is a perspective view of the headlamp (outer lens, housing is omitted), and FIG. 6 is shown in FIG. FIG. 7 is a cross-sectional view of the headlamp taken along line E-E, FIG. 7 is a cross-sectional view of the headlamp shown in FIG.

  As shown in FIGS. 3 and 6, the headlamp 10 is a two-lamp type (low beam and high beam) headlamp. The outer lens 12, the housing 16 that is combined with the outer lens 12 to form the lamp chamber 14, the lamp A low beam optical system 18A and a high beam optical system 18B disposed in the chamber 14, a heat sink 20, an aiming mechanism 22 and the like are provided.

  The outer lens 12 is a transparent light-transmitting cover as a whole. As shown in FIGS. 3 and 7, the outer lens 12 includes a transparent portion 12a and a transparent portion 12a through which light from the low beam optical system 18A and the high beam optical system 18B is transmitted. An extension portion 12b and the like extending toward the rear side of the vehicle as it goes upward from the upper portion is included. A portion of the outer lens 12 other than the transparent portion 12a (see the hatched region in FIG. 3) is blackened to be an opaque portion.

  The extension 12b of the outer lens 12 is covered with a cowl 24 (see FIG. 7). The cowl 24 extends toward the vehicle rear side along the extension portion 12b of the outer lens 12 as it goes upward from the vicinity of the upper portion of the transparent portion 12a and travels between the extension portion 12b of the outer lens 12 (FIG. 7). (See the middle arrow) constitutes the passage S1.

  As shown in FIGS. 3 and 6, the low beam optical system 18 </ b> A and the high beam optical system 18 </ b> B are disposed in the lamp chamber 14 while being adjacent to the left and right and being fixed to the heat sink 20.

  FIG. 9 is a perspective view of the headlamp (outer lens, housing, extension, first lens, and second lens omitted).

  As shown in FIG. 9, the heat sink 20 is supported by the housing 16 so as to be tiltable in the vertical and horizontal directions via the aiming mechanism 22.

  The low beam optical system 18A is a so-called direct projection type (also referred to as a direct-light type) optical system, and is disposed behind the first lens 26A and the first lens 26A as shown in FIGS. 1st light source 28A etc. which emit the direct light which permeate | transmits 1 lens 26A and the outer lens 12, and is irradiated ahead are provided.

  As shown in FIGS. 4 and 6, the first lens 26 </ b> A is made of a transparent resin, and includes a lens portion 26 a having a convex front surface and a concave rear surface, and a flange portion 26 b disposed around the lens portion 26 a. Contains.

  As shown in FIG. 5, the first lens 26 </ b> A has the flange portion 26 b sandwiched between the heat sink 20 (the pedestal portion 86) and the common extension 36 fixed by screwing to the heat sink 20. And is arranged in front of the first light source 28A. The lens portion 26a of the first lens 26A protrudes forward from an opening 36a formed in the extension 36.

  FIG. 25 is a front view of the heat sink.

  As shown in FIG. 25, pedestal portions 86 (86a to 86d) with which the first lens 26A abuts are provided at four locations around the front surface 38a of the first base portion 38 to which the first light source 28A is fixed.

  FIG. 26 (a) is an enlarged perspective view of the pedestal portion 86a, and FIG. 26 (b) depicts a state where the first lens 26A and the pedestal portion 86a are in contact with each other.

  The pedestal portion 86a includes a protruding portion 86a1 that contacts the back surface of the first lens 26A (flange portion 26b), a protruding portion 86a2 that contacts the upper surface of the first lens 26A (flange portion 26b), and the first lens 26A (flange portion 26b). Projecting portion 86a3 and the like with which the side faces come into contact.

  Similarly to the pedestal portion 86a, the pedestal portions 86b to 86d also have a protruding portion with which the back surface of the first lens 26A (flange portion 26b) contacts, a protruding portion with which the upper surface or the lower surface of the first lens 26A (flange portion 26b) contacts, One lens 26 </ b> A (flange portion 26 b) is provided with a projecting portion with which the side surface abuts.

  The reason for providing the pedestal portion 86 (86a to 86d) is to finely adjust the position of the first lens 26A and adjust the light distribution of the low beam optical system 18A. Thereby, for example, when the design is changed and the position of the first lens 26A is finely adjusted, the range in which the mold is repaired can be reduced and easily adjusted.

  FIG. 10 is a front view of the first light source 28A.

  As shown in FIG. 10, the first light source 28 </ b> A includes a substrate 30, a plurality of semiconductor light emitting elements 32 mounted on the surface of the substrate 30, a plurality of substrate side terminals 34 electrically connected to the semiconductor light emitting elements 32, and the like. I have. The plurality of board-side terminals 34 are mounted on the surface of the board 30 along the upper edge of the board 30.

  A plurality of semiconductor light emitting elements 32 (for example, a 1 mm square light emitting surface × 4) are mounted in a line on the surface of a ceramic (or metal) substrate 30 to form a horizontally elongated light emitting surface 32a. The semiconductor light emitting element 32 may be a semiconductor light emitting element having a structure in which an LED chip (or laser diode) whose emission color is blue and a yellow fluorescent material (for example, a YAG fluorescent material) covering the LED chip. Alternatively, it may be a semiconductor light emitting device having a structure combining LED chips (or laser diodes) of RGB three colors, or may be a semiconductor light emitting device having another structure.

  As shown in FIG. 9 and the like, the first light source 28A is configured such that the long side of the horizontally-long rectangular light-emitting surface 32a is horizontal, the horizontally-long rectangular light-emitting surface 32a faces forward, and the plurality of substrate-side terminals 34 face upward. In this state, it is fixed to the heat sink 20 with screws N and N.

  The high beam optical system 18B is a so-called direct projection type (also referred to as a direct-light type) optical system, and is disposed behind the second lens 26B and the second lens 26B as shown in FIGS. And a second light source 28B that emits direct light that passes through the two lenses 26B and the outer lens 12 and is irradiated forward.

  Like the first lens 26A, the second lens 26B includes a lens portion 26a having a convex front surface and a concave rear surface, and a flange portion 26b disposed around the lens portion 26a. .

  The second lens 26B is fixed to the heat sink 20 with its flange portion 26b sandwiched between the heat sink 20 (pedestal portion 86) and the common extension 36 screwed to the heat sink 20. It is arranged in front of the light source 28B. The lens portion 26a of the second lens 26B protrudes forward from an opening 36b formed in the extension 36.

  As shown in FIG. 25, pedestal portions 86 (86e to 86g) with which the second lens 26B abuts are provided at three locations around the front surface 40a of the second base portion 40 to which the second light source 28B is fixed.

  Similarly to the pedestal portion 86a, the pedestal portions 86e to 86g have a protruding portion with which the back surface of the second lens 26B (flange portion 26b) contacts, a protruding portion with which the upper surface or the lower surface of the second lens 26B (flange portion 26b) contacts, The projection part etc. which the side surface of 2 lens 26B (flange part 26b) contact | abut are provided.

  The reason for providing the pedestal portion 86 (86e to 86g) is to finely adjust the position of the second lens 26B and adjust the light distribution of the high beam optical system 18B. Thereby, for example, when the design is changed and the position of the second lens 26B is finely adjusted, the range in which the mold is repaired can be reduced and easily adjusted.

  Since the second light source 28B has the same configuration as that of the first light source 28A, the same reference numerals are given and description thereof is omitted.

  11 is a perspective view of the heat sink, FIG. 12A is a top view, and FIG. 12B is a cross-sectional view of the heat sink shown in FIG.

  The heat sink 20 is made of aluminum die casting. As shown in FIGS. 11, 12A, and 25, the first base portion 38, the second base portion 40, the third base portion 42, and the plurality of heat radiation fins 44a to 44c. The first opening 46A and the second opening 46B into which the couplers 56 attached to the power supply cables C1 and C2 are inserted are provided, and a pair of flange portions 48 and 50 disposed on the left and right sides when viewed from the front.

  The heat sink 20 is a common heat sink that dissipates and cools the heat generated by the first light source 28A and the second light source 28B (semiconductor light emitting element 32), and two molds (not shown) that move relatively in the horizontal direction. ), By supplying a molten aluminum alloy into a cavity formed by combining a single mold (not shown) that moves in the vertical direction relative to the two molds. Molded. The arrow in FIG. 12A represents the moving direction (molding direction) of two molds that move relatively in the horizontal direction, and the dotted line in FIG. 12A represents the contact surface of the two molds. The arrow in FIG. 12 (b) represents the moving direction of the mold that moves in the vertical direction (mold removal direction).

  As shown to Fig.12 (a), each base part 38-42 is arrange | positioned in order of the 1st base part 38, the 2nd base part 40, and the 3rd base part 42 toward the vehicle rear side from the vehicle front side. ing. The second base portion 40 is disposed at a position shifted toward the vehicle side with respect to the first base portion 38.

As shown in FIG. 12B, the first base portion 38 includes a front surface 38a and a rear surface 38b opposite to the front surface 38a. Both the front 38a and rear surface 38b is a vertical plane perpendicular to the optical axis AX ₁ extending in the longitudinal direction of the vehicle.

  As shown in FIGS. 9, 11, 12 (a), 12 (b), and 13, the front surface 38 a of the first base portion 38 is provided with a first opening 46 </ b> A. FIG. 13 is an enlarged perspective view of the vicinity of the first opening 46A.

  As shown in FIG. 12B, FIG. 13 and the like, the first opening 46A has the headlamps 10L and 10R having a smaller size in the vehicle width direction and a smaller size in the vehicle longitudinal direction, and preventing the coupler 56 from falling off. From this point of view, the coupler 56 (see FIGS. 15 and 16) attached to the power supply cable C1 is an opening that is inserted from above rather than from the side, front, or rear.

  The first opening 46A includes a front surface 38a (upper region 38a1) of the first base portion 38, left and right walls 38c and 38d extending forward from left and right sides of the front surface 38a of the first base portion 38, and upper front ends of the left and right walls 38c and 38d. It is comprised by the flame | frame 38e which connects.

  Accordingly, the coupler 56 including the coupler side terminal 60 that supplies the driving current to be supplied to the semiconductor light emitting element 32 is inserted from above, so that the coupler side terminal 60 and the semiconductor light emitting element 32 (substrate side terminal 34) are electrically connected. Can be connected to each other. This is because the first opening 46A into which the coupler 56 is inserted from above is electrically connected to the board-side terminal 34 of the board 30 at the coupler-side terminal 60 of the coupler 56 inserted into the first opening 46A. It is because it is provided in the position.

  Further, the headlamps 10L and 10R can be miniaturized (the size in the vehicle width direction and the size in the vehicle longitudinal direction). This is because the coupler 56 is the first opening 46A that is inserted from above rather than from the side or rear.

  As shown in FIG. 12B, the front surface 38a of the first base portion 38 includes an upper region 38a1 and a lower region 38a2 protruding forward from the upper region 38a1.

  14A is a BB cross-sectional view of the heat sink shown in FIG. 12A (including the first light source 28A), and FIG. 14B is a BB cross-sectional view of the heat sink shown in FIG. It is a figure (the 1st light source 28A and the coupler 56 are included).

  The lower region 38a2 is a surface on which the first light source 28A is fixed. As shown in FIG. 14A, the first light source 28A has a horizontally elongated light emitting surface 32a whose horizontal side is horizontal, and the horizontally elongated light emitting surface 32a. Faces the front, the back surface of the substrate 30 and the front surface 38a (lower region 38a2) of the first base portion 38 of the heat sink 20 are in surface contact, and the upper portion 30a of the substrate 30 is above the upper edge of the lower region 38a2. In the protruding state, the heat sink 20 is fixed to the front surface 38a (lower region 38a2) of the first base portion 38 with screws.

As shown in FIG. 13, the front surface 38a of the first base portion 38 is wider than the substrate 30 in the vehicle width direction, and both left and right sides thereof extend forward to form left and right walls 38c and 38d. Both the left and right walls 38 c and 38 d are vertical surfaces orthogonal to the front surface 38 a of the first base portion 38. Front upper portions of the left and right walls 38c, 38d are connected by a frame 38e extending in the vehicle width direction. The frame 38e includes a front surface 38e1 and a rear surface 38e2 opposite to the front surface 38e1. Both front 38e1 and rear surfaces 38e2 is a vertical plane perpendicular to the optical axis AX ₁ extending in the longitudinal direction of the vehicle.

  The frame 38e is narrow in the vertical direction and horizontally long in the vehicle width direction, and is disposed at a position overlapping the front surface 38a (upper region 38a1) of the first base portion 38 in front view (see FIG. 12B). ). The substrate 30 is disposed not at the center of the first opening 46A but at a position shifted to the rear side in order to prevent erroneous insertion of the coupler 56 (see FIG. 14A).

  As shown in FIGS. 12B and 13, the first opening 46 </ b> A is inserted into the first opening 46 </ b> A from above (for example, the upper portion of the first base portion 38 and the upper portion of the frame 38 e). The couplers 56 are in contact with each other, and guide portions 52 and 54 for guiding (sliding) the contacted coupler 56 toward the first opening 46A are provided. The guide portions 52 and 54 include surfaces 52a and 54a with which a coupler 56 inserted from above contacts.

  FIG. 15 is a perspective view of the headlamp (outer lens, first lens, second lens, and extension omitted).

  As shown in FIG. 15, the coupler 56 is attached to the front ends of the power supply cables C1 and C2. The base ends of the power supply cables C1 and C2 are electrically connected to a power supply circuit (not shown) accommodated in the housing 84 via a connector fixed to the housing 16.

  FIG. 16 is a perspective view of the coupler 56.

  As shown in FIGS. 14B and 16, the coupler 56 includes a coupler main body 58 having an opening 58a into which the upper portion 30a of the substrate 30 is inserted. The coupler main body 58 is inserted into the opening 58a. A plurality of coupler-side terminals 60 that are in electrical contact with a plurality of substrate-side terminals 34 mounted on the upper portion 30a of the substrate 30 and notches 30b formed on both sides of the upper portion 30a of the substrate 30 inserted into the opening 58a. , 30b (see FIG. 10).

  FIG. 17 is a cross-sectional view for explaining the engagement relationship between the coupler and the first light source.

  When the coupler 56 having the above configuration is inserted into the first opening 46A in the correct direction from above, the upper portion 30a of the substrate 30 is inserted into the opening 58a of the coupler 56, as shown in FIGS. The claw portions 62, 62 provided in the coupler 56 engage with the notches 30b, 30b formed on both sides of the upper portion 30a of the substrate 30 inserted into the coupler 56, and the coupler-side terminal 60 is connected to the substrate. Electrically connected to the side terminal 34. This prevents the coupler 56 inserted from above into the first opening 46A and having the coupler-side terminal 60 electrically connected to the board-side terminal 34 from dropping out of the first opening 46A. (Prevention means).

As shown in FIG. 12A, the second base portion 40 includes a front surface 40a and a rear surface 40b on the opposite side. Both the front 40a and rear surface 40b is a vertical plane perpendicular to the optical axis AX ₂ extending in the longitudinal direction of the vehicle.

  As shown in FIGS. 11 and 12A, a second opening 46 </ b> B is provided on the front surface 40 a of the second base portion 40.

  As shown in FIG. 12B and the like, the second opening 46B is formed from the viewpoint of reducing the size of the headlamps 10L and 10R in the vehicle width direction and the size of the vehicle longitudinal direction and preventing the coupler 56 from falling off. The coupler 56 (see FIGS. 15 and 16) attached to the power supply cable C2 is an opening that is inserted from above rather than from the side, front, or rear.

  Since the second opening 46B has the same configuration as the first opening 46A, the same reference numerals are given and description thereof is omitted.

As shown in FIG. 12A, the third base portion 42 includes a front surface 42a and a rear surface 42b opposite to the front surface 42a. Both the front 42a and rear surface 42b is a vertical plane perpendicular to the optical axis AX ₁ extending in the longitudinal direction of the vehicle. The front surface 42a includes a portion facing the first base portion 38 and a portion facing the second base portion 40.

  As shown in FIGS. 11 and 12A, the plurality of heat radiating fins 44a are arranged at a predetermined interval in the vehicle width direction, and the first base portion 38 (rear surface 38b) and the second base portion 40 (rear surface 40b). ) And the third base portion 42 (front surface 42a). As a result, a plurality of cylindrical portions 64 are configured that are surrounded on all sides by the first base portion 38, the second base portion 40, the third base portion 42, and the plurality of heat radiation fins 44a. A lower end opening of each of the plurality of cylindrical portions 64 is closed by a bottom surface 66.

  Thereby, the strength of the plurality of heat radiation fins 44a can be increased. This is because the plurality of radiating fins 44a are connected to the first base portion 38 and / or the second base portion 40 and the third base portion 42 to constitute at least one cylindrical portion 64 surrounded on all sides, This is because the bottom end opening of the cylindrical portion 64 is closed by the bottom surface 66 and reinforced.

  Further, the heat generated in the semiconductor light emitting element 32 can be efficiently radiated and cooled. This is because the lower end opening of at least one cylindrical portion 64 is closed with the bottom surface 66 to increase the heat conduction path.

  In addition, when forming a heat sink 20 by supplying a molten aluminum alloy into a cavity configured by combining molds, the molten aluminum alloy can be spread throughout the cavity (not shown). It becomes. As a result, the heat sink 20 can be formed into a designed shape. This is because the cavity portion (not shown) corresponding to the closed bottom surface 66 functions as a passage for the molten aluminum alloy by closing the lower end opening of at least one cylindrical portion 64 with the bottom surface 66. Is. The inventors of the present application confirmed this by experiment.

  The rear surface 40b of the second base portion 40 is provided with a plurality of radiating fins 44b extending toward the rear of the vehicle at a predetermined interval in the vehicle width direction. The rear surface 42b of the third base portion 42 is provided with a plurality of radiating fins 44c extending toward the rear of the vehicle at a predetermined interval in the vehicle width direction.

  According to the heat sink 20 having the above-described configuration, the heat generated in the semiconductor light emitting element 32 can be “dissipated” more efficiently and cooled. This is because the heat sink 20 is integrally formed as one part including the first base portion 38, the second base portion 40, the third base portion 42, and the plurality of heat radiation fins 44a to 44c. This is because no gap occurs between the heat sinks 270 (radiation fins) and the pedestal portion 230, and no contact thermal resistance due to the gap occurs.

  Moreover, according to the heat sink 20 of the said structure, reduction of a number of parts, reduction of an assembly man-hour, and the improvement of an assembly precision are attained. This is because the heat sink 20 is not a plurality of components, but as a single component including the first base portion 38, the second base portion 40, the third base portion 42, the openings 46A and 46B, and the plurality of heat radiation fins 44a to 44c. This is due to being molded.

  As shown in FIGS. 6 and 7, at least the first base portion 38 and the second base portion 40 are disposed in the lamp chamber 14, and the third base portion 42 is formed in the housing 16. As shown in FIGS. 9 and 18, the opening 16 a is covered and a plurality of radiating fins 44 c protrudes from the opening 16 a formed in the housing 16 to the housing 16 via the aiming mechanism 22. It is supported so that it can tilt. 18 is a cross-sectional view taken along the line CC of the headlamp shown in FIG.

  Thereby, the heat generated in the semiconductor light emitting element 32 can be efficiently radiated and cooled. This is because at least a part of the heat sink 20 (a plurality of heat radiation fins 44 c) protrudes outside the lamp chamber 14 from the opening 16 a formed in the housing 16.

  As shown in FIGS. 9 and 18, the aiming mechanism 22 includes a frame 70 that extends in the vehicle width direction above the heat sink 20 and connects a pair of flange portions 48 and 50 arranged on the left and right sides in a front view. A connecting portion 72 (for example, an aiming screw 72a and a nut 72b) for connecting one end side of the frame 70 and the housing 16 such that one end side of the frame 70 serves as a fulcrum when the heat sink 20 is tilted, and a first aiming screw 74 ( An optical axis adjusting screw) and a second aiming screw 76 (optical axis adjusting screw).

  The first aiming screw 74 is screwed into a first nut 78 attached to the other end side of the frame 70 via a first through hole 16 b formed in the housing 16. The second aiming screw 76 is screwed into a second nut 80 attached to a heat sink portion located below the connecting portion 72 through a second through hole 16 c formed in the housing 16.

  As a result, the size of the motorcycle headlamp can be reduced. This is because the first nut 78 into which the connecting portion 72 and the first aiming screw 74, which are fulcrums at the time of tilting, are screwed is attached not to the heat sink 20 but to the frame 70.

  That is, when the heat sink 20 is formed by supplying a molten aluminum alloy into a cavity formed by combining a mold including a mold having a vertical direction (see an arrow in FIG. 23A), In relation to the removal direction of the mold, a portion that becomes a fulcrum when tilting (see symbol A1 in FIG. 23A), a portion to which a nut to which the aiming screw is screwed is attached (in FIG. 23A) As a result of protruding outward (see reference signs A2 and A3), there is a problem that the motorcycle headlamp cannot be reduced in size.

  On the other hand, in the present embodiment, a frame 70 that is a separate component from the heat sink 20 is connected to the pair of flange portions 48 and 50 above the heat sink 20 in the vehicle width direction, as shown in FIGS. As shown in (b), the connecting portion 72 serving as a fulcrum during tilting and the first nut 78 into which the first aiming screw 74 is screwed are attached to the frame 70 instead of the heat sink 20. As a result, as shown in FIG. 23 (b), the portion to which the connecting portion 72, which serves as a fulcrum at the time of tilting, and the nuts 78 and 80 to which the aiming screws 74 and 76 are screwed is attached to the heat sink 20 that does not protrude outward. It becomes possible to mold. As a result, a small motorcycle headlamp can be realized.

  In addition, the strength of the heat sink 20 can be increased. This is because the pair of flange portions 48 and 50 of the heat sink 20 are connected by the frame 70 and reinforced.

  As shown in FIGS. 6 to 8, the gap S <b> 2 between the opening 16 a formed in the housing 16 and the plurality of radiating fins 44 c protruding from the opening 16 a formed in the housing 16 is a single cover 68 that can be expanded and contracted. It is covered with (waterproof rubber cover). The inner periphery of the cover 68 is fitted to the heat radiating fins 44 c (and / or the third base part 42), and the outer periphery thereof is fitted around the opening 16 a of the housing 16.

  By adjusting the screwing amounts of the aiming screws 74 and 76 to the nuts 78 and 80, the optical axes of the low beam optical system 18A and the high beam optical system 18B accommodated in the lamp chamber 14 are collectively adjusted. It becomes possible. This is because the low beam optical system 18A and the high beam optical system 18B are attached to a common heat sink 20, and the heat sink 20 to which the low beam optical system 18A and the high beam optical system 18B are attached is tilted with respect to the housing 16. This is because the aiming mechanism 22 is provided so as to support it.

  Further, water or water enters the lamp chamber 14 from the gap S2 between the opening 16a formed in the housing 16 and at least a part of the heat sink 20 (a plurality of heat radiating fins 44c) protruding out of the lamp chamber 14 from the opening 16a. It is possible to prevent dust and the like from entering. In particular, as the heat sink 20 tilts, there is a gap S2 between the opening 16a formed in the housing 16 and at least a part of the heat sink 20 (a plurality of radiation fins 44c) protruding from the opening 16a to the outside of the lamp chamber 14. Even if it changes, it becomes possible to prevent water, dust and the like from entering the lamp chamber 14 from the gap S2. This is because the gap S2 between the opening 16a formed in the housing 16 and at least a part of the heat sink 20 protruding from the opening 16a (the plurality of heat radiation fins 44c) can follow the change of the gap S2. This is because the cover 68 is covered with a stretchable cover 68 (for example, a rubber cover).

  FIG. 19 is a cross-sectional view of the headlamp shown in FIG.

  As shown in FIG. 19, two upper and lower ventilation holes 16 d and 16 e communicating with the inside of the lamp chamber 14 are formed on the rear surface of the housing 16. Each of the two vent holes 16d and 16e is closed by a breathing cap 82 (see FIG. 8).

  The breathing cap 82 includes a labyrinth-like air passage and / or a breathing filter communicating with the vent holes 16d and 16e. The breathing cap 82 allows a breathing action in the lamp chamber 14 by the air passage and / or the breathing filter. 14 is used to prevent water from entering the inside. As such a breathing cap 82, the thing as described in Unexamined-Japanese-Patent No. 2010-170751 and Unexamined-Japanese-Patent No. 2011-181220 can be used, for example. Of the two ventilation holes 16d and 16e, the lower ventilation hole 16e is formed at a position below the bottom surface 66 in the vertical direction (see FIG. 19).

  Thereby, the low beam optical system 18A and the high beam optical system 18B (particularly, the resin-made first lens 26A and second lens 26B) can be cooled. This is because, as shown in FIG. 19, due to the action of the bottom surface 66 that closes the lower end opening of at least one cylindrical portion 64, a part of the outside air that has flowed into the lamp chamber 14 from the lower vent hole 16 e Along the outer lens 12 and the low beam optical system 18A (and the high beam optical system 18B) toward the space S3, passes through the space S3, and rises from the upper vent hole 16d to the outside of the lamp chamber 14. This is due to the occurrence of convection that flows into

  If the lower end opening of each of the plurality of cylindrical portions 64 is not closed by the bottom surface 66, as shown in FIG. 24, the space between the outer lens 12 and the low beam optical system 18A (and the high beam optical system 18B). Since convection toward S3 does not occur, it is difficult to efficiently cool the low beam optical system 18A and the high beam optical system 18B (particularly, the first lens 26A and the second lens 26B made of resin).

  The bottom surface 66 may be formed with at least one vent hole 66a penetrating in the vertical direction, as shown in FIGS.

  Thereby, the heat generated in the semiconductor light emitting element 32 can be dissipated more efficiently and cooled. This is caused by the action of at least one vent hole 66a formed in the bottom surface 66 that closes the lower end opening of at least one cylindrical portion 64, and flows into the lamp chamber 14 from the lower vent hole 16e as shown in FIG. Part of the outside air that has passed through the inside of the cylindrical portion 64 rises from the vent hole 66a formed in the bottom surface 66 (chimney effect), and convection flows out of the lamp chamber 14 from the upper vent hole 16d. It is by doing.

  22 is a rear perspective view of the headlamp (without stay 88), and FIG. 27 is a rear view of the headlamp (with stay 88).

  As shown in FIGS. 6, 7, 22, and 27, a power supply circuit (see FIG. A housing 84 that houses (not shown) is disposed. The housing 84 is electrically connected to the first light source 28A and the second light source 28B (semiconductor light emitting element) disposed in the left lamp chamber 14, and the first light source 28A and the second light source 28B (semiconductor light emitting element). ) And a first light source 28A and a second light source 28B (semiconductor light emitting element) disposed in the right lamp chamber 14 and electrically connected to the first light source 28A, The two light sources 28B (semiconductor light-emitting elements) are a common housing that includes two power supply circuits for supplying a drive current.

  The casing 84 is made of resin and travel wind (see arrow in FIG. 7) flowing through the passage S <b> 1 formed between the extension 12 b of the outer lens 12 and the cowl 24 is common to the casing 84. Along the plurality of heat dissipating fins 44 c along the headlamp 10 </ b> L, the vehicle is located behind the housing 16 and between the headlamp 10 </ b> L disposed on the left and the headlamp 10 </ b> R disposed on the right (FIG. 6). , See FIG.

  Thereby, the heat generated in the semiconductor light emitting element 32 can be dissipated more efficiently and cooled. This is because the traveling wind (see the arrow in FIG. 7) flowing through the passage S1 between the extension 12b of the outer lens 12 and the cowl 24 is controlled by the common casing 84, and a plurality of radiating fins. This is due to forced cooling of 44c (see FIG. 7).

  In addition, the size of the motorcycle headlamps 10R, 10L can be reduced. This is because a power supply circuit (two in total on the left and right) provided for each of the left and right lamp chambers is housed in a single casing 84 (see, for example, Japanese Patent Application Laid-Open No. 2004-276739). is there.

  In addition, the number of parts and assembly man-hours can be reduced. This is because a conventional housing (for example, see Japanese Patent Application Laid-Open No. 2004-276739) that houses a power supply circuit provided for each of the left and right lamp chambers (two in total on the left and right, see FIG. 28). This is because the body 84 is used.

  For example, as shown in FIG. 27, the common casing 84 is held by the housing 16 or the like by a stay 88 fixed to the housing 16 or the like, while the vehicle body (vehicle body frame, front fork or the like), the housing 16 or the like. It is clamped between and fixed.

  As described above, according to the headlamps 10L and 10R of the present embodiment, the following advantages are produced.

  First, it is possible to increase the strength of the plurality of radiating fins 44a. This is because the plurality of radiating fins 44a are connected to the first base portion 38 and / or the second base portion 40 and the third base portion 42 to constitute at least one cylindrical portion 64 surrounded on all sides, This is because the bottom end opening of the cylindrical portion 64 is closed by the bottom surface 66 and reinforced.

  Second, the heat generated in the semiconductor light emitting element 32 can be efficiently radiated and cooled. This is because the lower end opening of at least one cylindrical portion 64 is closed with the bottom surface 66 to increase the heat conduction path.

  Third, when forming a common heat sink 20 by supplying a molten aluminum alloy into a cavity formed by combining molds, the molten aluminum alloy can be spread throughout the cavity. Become. As a result, the common heat sink 20 can be formed into a designed shape. This is because the cavity portion corresponding to the closed bottom surface 66 functions as a passage for the molten aluminum alloy by closing the lower end opening of at least one cylindrical portion 64 with the bottom surface 66. The inventors of the present application confirmed this by experiment.

  Fourth, the low beam optical system 18A and the high beam optical system 18B (particularly, the first lens 26A and the second lens 26B) can be cooled. This is because a part of the outside air that has flowed into the lamp chamber 14 from the lower vent hole 16e is caused to flow along the bottom surface 66 with the outer lens 12 by the action of the bottom surface 66 that closes the lower end opening of at least one cylindrical portion 64. The convection flows toward the space S3 between the low beam optical system 18A (and the high beam optical system 18B), passes through the space S3, rises, and flows out of the lamp chamber 14 from the upper vent hole 16d. It is because.

  Fifth, the heat generated in the semiconductor light emitting element 32 can be dissipated more efficiently and cooled. This is because a part of the outside air that has flowed into the lamp chamber 14 from the lower vent hole 16e by the action of the at least one vent hole 66a formed in the bottom surface 66 that closes the lower end opening of the at least one cylindrical portion 64, This is due to the occurrence of convection that rises from the vent hole 66a formed in the bottom surface 66 through the cylindrical portion 64 (chimney effect) and flows out of the lamp chamber 14 from the upper vent hole 16d.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

DESCRIPTION OF SYMBOLS 10 (10R, 10L) ... Motorcycle headlamp, 12 ... Outer lens, 12a ... Transparent part, 12b ... Extension part, 14 ... Light chamber, 16 ... Housing, 16a ... Opening, 16b, 16c ... Through-hole, 16d, 16e ... vent hole, 18A ... low beam optical system, 18B ... high beam optical system, 20 ... heat sink, 22 ... aiming mechanism, 24 ... cowl, 26A ... first lens, 26a ... lens part, 26b ... flange part, 28A ... 1st light source, 28B ... 2nd light source, 30 ... board | substrate, 30a ... upper part, 30b ... notch part, 32 ... semiconductor light emitting element, 32a ... light emission surface, 34 ... board | substrate side terminal, 36 ... extension, 36a ... opening, 38 ... 1st base part, 38a ... front surface, 38a1 ... upper region, 38a2 ... lower region, 38b ... rear surface, 38c, 38d ... left and right walls, 38e ... frame, 3 e1 ... front surface, 38e2 ... rear surface, 40 ... second base portion, 40a ... front surface, 40b ... rear surface, 42 ... third base portion, 42a ... front surface, 42b ... rear surface, 44a to 44c ... radiation fins, 46A ... first opening Part 46B ... 2nd opening part 48, 50 ... flange part 52, 54 ... guide part 56 ... coupler, 58 ... coupler body, 58a ... opening part, 60 ... coupler side terminal, 62 ... claw part, 64 ... Cylindrical part, 66 ... bottom surface, 66a ... vent hole, 68 ... cover, 70 ... frame, 72 ... connecting part, 72a ... aiming screw, 72b ... nut, 74, 76 ... aiming screw, 78, 80 ... nut, 82 ... breathing Cap, 84. Housing, 86 (86a to 86g) ... Base, 88 ... Stay

Claims (3)

In motorcycle headlamps,
An outer lens,
A housing constituting a lamp chamber in combination with the outer lens;
A low-beam optical system disposed in the lamp chamber, including a first lens, and a first semiconductor light emitting element that emits direct light that is transmitted forward through the first lens and the outer lens;
A high-beam optical system disposed in the lamp chamber, including a second lens, and a second semiconductor light emitting element that emits direct light that is transmitted forward through the second lens and the outer lens;
The first base portion to which the low beam optical system is attached, the second base portion to which the high beam optical system is attached, and a position shifted to the vehicle rear side from the first base portion and the second base portion. A plurality of radiating fins arranged at a predetermined interval in the vehicle width direction and connecting between the first base part and / or the second base part and the third base part, with the arranged third base part And a bottom surface that closes a lower end opening of at least one cylindrical portion surrounded on all sides by the first base portion and / or the second base portion, the third base portion, and the plurality of radiating fins. A common heat sink that is integrally formed with and radiates and cools the heat generated in the first semiconductor light emitting device and the second semiconductor light emitting device,
An aiming mechanism for tiltably supporting the common heat sink with respect to the housing;
With
A headlamp for a motorcycle, wherein at least the first base portion, the second base portion, the plurality of heat radiation fins, and the bottom surface are disposed in the lamp chamber. On the back of the housing, two upper and lower vent holes communicating with the lamp chamber are formed,
Each of the two vent holes is closed by a breathing cap,
2. The motorcycle headlamp according to claim 1, wherein the lower ventilation hole of the two ventilation holes is formed at a position below the bottom surface in the vertical direction.   The motorcycle headlamp according to claim 1 or 2, wherein at least one ventilation hole penetrating in the vertical direction is formed in the bottom surface.