Heat discharging structure of headlamp

Abstract

To improve heat exhaust performance while suppressing adhesion of foreign matter.SOLUTION: The head lamp (51) irradiates the front of the vehicle. The heat exhaust structure of the head lamp is provided with a lamp cover (41) covering the periphery of a lens (52) of the head lamp, a housing (61) covering a rear surface of the head lamp from a rear side, and a front fender (24) installed below the housing. An intake hole (62) is formed in a lower surface of the housing, a heat discharge hole (63) is formed in an upper surface of the housing, and a front fender is positioned below the intake hole.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a heat dissipation structure for a headlamp. [Background technology]

[0002] Conventionally, straddle-type vehicles have been known in which the lens surface of a headlamp is exposed from an opening in a front cover (see, for example, Patent Document 1). The headlamp described in Patent Document 1 has a dome-shaped outer lens attached to the front opening of a lamp housing. A light source is installed on the rear surface of the lamp housing via a substrate, and an inner lens is installed inside the outer lens and in front of the light source. Light emitted from the light source passes through the inner lens and outer lens, and the light emitted to the outside from the outer lens illuminates the area ahead of the vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6490728 Summary of the Invention [Problem to be solved by the invention]

[0004] Anticipating that headlamps will become very hot, highly heat-resistant materials are used for the components around the headlamp and the gaps between the components are widened, which can increase costs and the size of the lamp. However, if the gaps between the components are widened too much to improve the headlamp's heat dissipation performance, there is a problem in that foreign matter such as water and mud can easily adhere to the headlamp.

[0005] The present invention has been made in view of the above points, and has an object to provide a heat dissipation structure for a headlamp that can improve heat dissipation performance while suppressing adhesion of foreign matter. [Means for solving the problem]

[0006] One aspect of the present invention provides a heat dissipation structure for a headlamp that illuminates the area in front of a vehicle, and includes a lamp cover that covers the area around the lens of the headlamp, a housing that covers the rear surface of the headlamp from the rear, and a front fender installed below the housing, with an air intake hole formed on the lower surface of the housing, a heat dissipation hole formed on the upper surface of the housing, and the front fender positioned below the air intake hole, thereby solving the above-mentioned problem. [Effects of the Invention]

[0007] According to one aspect of the headlamp heat dissipation structure of the present invention, the wind from traveling enters through the air intake holes on the bottom surface of the housing and hot air is pushed out through the heat dissipation holes on the top surface of the housing, improving the heat dissipation performance of the headlamp. Even if foreign objects such as water or mud are splashed up by the front wheel, the front fender protects the housing from the foreign objects. The front fender prevents foreign objects from entering the housing through the air intake holes, preventing the foreign objects from adhering to the headlamp. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a left side view of the vehicle interior structure of the present embodiment. [Figure 2] FIG. 2 is a left side view of the headlamp and its surroundings according to the present embodiment. [Figure 3] FIG. 2 is a front view of the headlamp and its surroundings according to the present embodiment. [Figure 4] FIG. 4 is a cross-sectional view of the headlamp periphery in FIG. 3 taken along line AA. [Figure 5] 3 is an explanatory diagram of the heat dissipation structure of the headlamp of the present embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] A headlamp according to one aspect of the present invention illuminates the area ahead of a vehicle. In this headlamp's heat dissipation structure, the area around the headlamp lens is covered with a lamp cover, the rear of the headlamp is covered with a housing, and a front fender is installed below the housing. An air intake hole is formed on the lower surface of the housing, and a heat exhaust hole is formed on the upper surface of the housing. Wind from driving enters through the air intake hole on the lower surface of the housing, and hot air is pushed out through the heat exhaust hole on the upper surface of the housing, thereby improving the headlamp's heat dissipation performance. In addition, the front fender is located below the housing's air intake hole, and the front fender protects the housing from foreign objects such as water or mud that are splashed up by the front wheel. The front fender prevents foreign objects from entering the housing through the air intake hole, preventing foreign objects from adhering to the headlamp. [Example]

[0010] A saddle-type vehicle according to this embodiment will now be described with reference to the accompanying drawings. Fig. 1 is a left side view of the internal structure of the vehicle according to this embodiment. In the following drawings, arrow Fr indicates the front of the vehicle, arrow Re indicates the rear of the vehicle, arrow L indicates the left side of the vehicle, and arrow R indicates the right side of the vehicle.

[0011] As shown in Fig. 1, the saddle-ride type vehicle 1 is configured by mounting various parts such as an engine 35 and an electrical system on a body frame 10. A pair of main frames 12 extend diagonally downward and rearward from a head pipe 11 of the body frame 10, and the rear portions of the pair of main frames 12 bend downward to form a pair of body frames 13. A down frame 14 also extends downward from the head pipe 11, and a pair of under loops 15 bent rearward are connected to the lower portion of the down frame 14. The rear ends of the pair of under loops 15 are connected to the lower portions of the pair of body frames 13, so that the body frame 10 is formed into a cradle shape.

[0012] A front fork 21 is steerably supported on the head pipe 11 via a steering shaft (not shown). Handlebars 22 are provided on the upper part of the front fork 21, and a front wheel 23 is rotatably supported on the lower part of the front fork 21. A front fender 24 is provided on the front fork 21, and the front wheel 23 is covered from above by the front fender 24. A fuel tank 25 is placed on the upper part of the pair of main frames 12, and the main frames 12 and the fuel tank 25 are covered from the sides by front side covers 26. A seat 27 is provided behind the fuel tank 25.

[0013] A swing arm 31 is swingably supported by the body frame 13. The swing arm 31 extends rearward from the body frame 13, and a rear wheel 32 is rotatably supported at the rear end of the swing arm 31. A rear fender 33 is provided behind the seat 27, and covers the rear wheel 32 from above. The engine 35 is a four-stroke single-cylinder engine, and is suspended inside the body frame 10 via multiple suspension brackets. A cylinder assembly, which includes a cylinder 37, a cylinder head 38, and a cylinder head cover 39, is attached to the top of a crankcase 36 of the engine 35.

[0014] Furthermore, a housing 61 is provided in front of the head pipe 11, and a meter 28 is attached to the upper part of the housing 61. The housing 61 is covered from the front by a lamp cover 41, and the lens of a headlamp 51 (see FIG. 3) is exposed through an opening in the lamp cover 41. Because the headlamp 51 is covered from the front and rear by the lamp cover 41 and the housing 61, it is necessary to improve the heat dissipation performance of the headlamp 51. Therefore, in this embodiment, a passage for the running wind to pass from the bottom to the top of the housing 61 is formed to improve the heat dissipation performance. Furthermore, the front fender 24 and the meter 28 prevent foreign matter such as water and mud from entering the housing 61.

[0015] The heat dissipation structure of the headlamp will be described with reference to Figures 2 to 4. Figure 2 is a left side view of the headlamp and its periphery in this embodiment. Figure 3 is a front view of the headlamp and its periphery in this embodiment. Figure 4 is a cross-sectional view of the headlamp and its periphery in Figure 3 taken along line AA.

[0016] As shown in Figures 2 and 3, a headlamp 51 that illuminates the area ahead of the vehicle is attached to the front of the saddle-type vehicle 1. The periphery of a lens 52 of the headlamp 51 is covered by a lamp cover 41. An inverted U-shaped bulge 42 is formed on the front surface of the lamp cover 41 so as to surround the top and both sides of the headlamp 51. A cover portion protrudes outward in the left-right direction and upward from the outer edge of the bulge 42, and the lens 52 of the headlamp 51 is exposed from an opening 43 inside the bulge 42. An annular rubber cover 44 is attached to the periphery of the headlamp 51, and the rubber cover 44 fills the gap between the opening 43 of the lamp cover 41 and the headlamp 51.

[0017] The rear face of headlamp 51 is covered from the rear side by housing 61. Housing 61 is formed in a box shape with an open front, and lamp cover 41 is attached to housing 61 so as to cover the front of housing 61. Meter 28 is attached to the top face of housing 61, and headlamp controller 55 is attached to the lower rear face of housing 61. An upper part of housing 61 is supported by upper bracket 72 of front fork 21 via support bracket 71, and a lower part of housing 61 is supported by lower bracket 74 of front fork 21 via support bracket 73.

[0018] The headlamp 51 is also formed so that its optical axis can be adjusted (aimed) from the outside of the housing 61. The headlamp 51 is supported inside the housing 61 via a lamp bracket (not shown) so that it can swing up and down. An elongated hole (not shown) is formed in the left side surface of the housing 61, and the optical axis of the headlamp 51 is adjusted within the range of the elongated hole by an optical axis adjustment bolt 75 provided in the elongated hole. As described above, the rubber cover 44 is attached around the headlamp 51, and the rubber cover 44 deforms in response to the swing of the headlamp 51, allowing the optical axis of the headlamp 51 to be adjusted.

[0019] A beak-shaped front fender 24 is attached to the lower bracket 74, and the front fender 24 protects the headlamp 51 and other components from foreign objects that may be kicked up by the front wheel 23 (see FIG. 1). The front fender 24 is installed below the housing 61, and covers the lamp cover 41 and the housing 61 from below. In a side view, the front fender 24 curves so that it rises from the front end toward the lamp cover 41, and a groove 66 is formed in the upper surface of the front fender 24 from the front end side to below the lamp cover 41. A slope 67 is formed behind the groove 66 of the front fender 24.

[0020] As shown in Figures 3 and 4, the headlamp 51 is constructed by attaching a lens 52 to the front of a lamp housing 53. A heat sink 54 is formed on the upper side of the lamp housing 53. Heat generated in the headlamp 51 is dissipated to the outside by the heat sink 54. The heat sink 54 of the headlamp 51 is housed inside a housing 61. An air intake hole 62 is formed on the bottom surface of the housing 61, and a heat exhaust hole 63 is formed from the top surface to the rear surface of the housing 61. The airflow from the air intake hole 62 to the heat exhaust hole 63 exposes the heat sink 54 to the airflow, thereby effectively cooling the headlamp 51.

[0021] Wires 57 extending from the headlamp 51 are passed through intake holes 62 on the bottom surface of the housing 61, and wires 29 extending from the meter 28 are passed through heat exhaust holes 63 on the top surface of the housing 61. In this way, the through holes for wires 57, 29 are used as intake holes 62 and heat exhaust holes 63. Note that intake holes 62 and heat exhaust holes 63 are larger than wires 57, 29, respectively, and sufficient gaps are provided between wires 57, 29 and each hole. Also, a gap 68 is provided between lamp cover 41 and housing 61, and traveling wind also enters housing 61 through gap 68 between lamp cover 41 and housing 61.

[0022] The front fender 24 is located below the air intake holes 62 of the housing 61. Even if foreign objects such as water or mud are kicked up by the front wheel 23 (see FIG. 1), the front fender 24 prevents the foreign objects from entering the housing 61 through the air intake holes 62. The top surface of the housing 61 is inclined so that it slopes downward toward the rear, and the meter 28 is attached to the inclined surface of this housing 61. A heat exhaust hole 63 is formed on the rear side of the top surface of the housing 61, and the meter 28 is located above the heat exhaust hole 63. Even if foreign objects such as rain or snow fall from above, the meter 28 prevents the foreign objects from entering the housing 61 through the heat exhaust hole 63.

[0023] As described above, a long groove 66 is formed in the front-to-rear direction in the center of the upper surface of the front fender 24 in the vehicle width direction. Groove 66 of the front fender 24 extends from a position forward of the front surface of the lamp cover 41 to a position rearward of the front surface of the lamp cover 41. The front end of groove 66 is located outside of the lamp cover 41, and the rear end of groove 66 is located inside of the lamp cover 41 and in front of the air intake hole 62 of the housing 61. Even if the gap between the lamp cover 41 and the front fender 24 is narrowed to prevent foreign matter from entering the housing 61 through the air intake hole 62, groove 66 of the front fender 24 allows sufficient airflow during riding to be guided to the air intake hole 62 of the housing 61.

[0024] The underside 45 of the lamp cover 41 faces the bottom surface of the groove 66 of the front fender 24. The underside 45 of the lamp cover 41 is inclined so that the rear end of the underside of the lamp cover 41 is lower than the front end of the underside. A portion of the underside 45 of the lamp cover 41 fits into the groove 66 of the front fender 24. The underside 45 of the lamp cover 41 is brought close to the bottom surface of the groove 66 of the front fender 24, narrowing the passage for airflow between the lamp cover 41 and the front fender 24. The gap between the lamp cover 41 and the front fender 24 prevents foreign matter from entering, while the inclination of the underside 45 of the lamp cover 41 guides airflow into the groove 66 of the front fender 24.

[0025] A slope 67 is formed on the rear side of the groove 66 of the front fender 24. The slope 67 is inclined so that it rises toward the rear, and the rear end of the slope 67 is located rearward of the front end 64 of the underside of the housing 61. A recess 65 that is recessed upward is provided in the underside of the housing 61, and an air intake hole 62 is formed in the bottom surface of this recess 65. The slope 67 of the front fender 24 fits into the recess 65 of the housing 61, narrowing the passage for the airflow between the slope 67 and the recess 65. The gap between the recess 65 and the slope 67 prevents foreign matter from entering, and the inclination of the slope 67 guides the airflow to the air intake hole 62.

[0026] The flow of the wind while traveling will be described with reference to Figure 5. Figure 5 is an explanatory diagram of the heat dissipation structure of the headlamp of this embodiment. Note that Figure 5(A) shows the flow of the wind while traveling near the intake hole, and Figure 5(B) shows the flow of the wind while traveling near the heat dissipation hole.

[0027] As shown in Figure 5(A), a passage for the traveling wind is formed between the lamp cover 41 and the front fender 24. A groove 66 is formed in the upper surface of the front fender 24, and the underside 45 of the lamp cover 41 is inclined downward toward the rear. The traveling wind F flows along the front fender 24 and the underside 45 of the lamp cover 41, and is taken into the inside of the lamp cover 41 through the groove 66 of the front fender 24. The underside 45 of the lamp cover 41 fits into the groove 66 of the front fender 24, narrowing the passage for the traveling wind F, making it difficult for foreign matter such as mud and water splashed up by the front wheel 23 (see Figure 1) to enter the inside of the lamp cover 41.

[0028] When the road wind F enters the inside of the lamp cover 41, part of the road wind F1 flows into a gap 68 between the lamp cover 41 and the housing 61. A connector 56 is located below the lens 52 of the headlamp 51, and the road wind F1 flows around the connector 56 and upward toward the heat sink 54 of the headlamp 51. The other part of the road wind F2 flows through a slope 67 of the front fender 24 into an intake hole 62 in a recess 65 of the headlamp 51. Wiring 57 of the headlamp 51 passes through the intake hole 62, and the road winds F1 and F2 pass through the gap between the intake hole 62 and the wiring 57 and flow upward toward the heat sink 54 of the headlamp 51.

[0029] As the airflow F1, F2 passes through the heat sink 54 of the headlamp 51, heat is exchanged between the heat sink 54 and the airflow F1, F2, effectively cooling the headlamp 51. The intake hole 62 of the housing 61 is covered from below by the front fender 24, preventing foreign matter from entering the intake hole 62. Even if the intake hole 62 for the headlamp 51 is formed in the housing 61, preventing foreign matter from entering the intake hole 62 prevents foreign matter from adhering to the headlamp 51. As the intake hole 62 utilizes a through hole for the wiring 57, there is no need to form a new hole in the housing 61.

[0030] As shown in Figure 5(B), a heat exhaust hole 63 is formed below the meter 28, extending from the top surface to the rear surface of the housing 61. The heat exhaust hole 63 on the top surface of the housing 61 is covered from above by the meter 28, and the heat exhaust hole 63 on the rear surface of the housing 61 is open toward the rear. Some of the running wind F3 flows from below the meter 28 toward the front through the heat exhaust hole 63 on the top surface of the housing 61, while other running wind F4 flows toward the rear of the meter 28 through the heat exhaust hole 63 on the rear surface of the housing 61. The wiring 29 of the meter 28 passes through the heat exhaust hole 63, and the running winds F3 and F4 flow out through the gap between the heat exhaust hole 63 and the wiring 29.

[0031] As the winds F3 and F4 pass through the heat exhaust holes 63, the hot air inside the housing 61 is pushed out by the winds F3 and F4. The heat exhaust holes 63 on the top surface of the housing 61 are covered by the meter 28, but the heat exhaust holes 63 on the rear surface of the housing 61 are open, so the hot air inside the housing 61 is exhausted to the outside while preventing foreign matter from entering the heat exhaust holes 63. Even if the heat exhaust holes 63 for the headlamps 51 are formed in the housing 61, the entry of foreign matter into the heat exhaust holes 63 is prevented, preventing foreign matter from adhering to the headlamps 51. The heat exhaust holes 63 utilize the through holes for the wiring 29, so there is no need to form new holes in the housing 61.

[0032] As described above, with the heat dissipation structure of the headlamp 51 of this embodiment, airflow enters through the air intake holes 62 on the bottom surface of the housing 61 and hot air is pushed out through the heat dissipation holes 63 on the top surface of the housing 61, improving the heat dissipation performance of the headlamp 51. Even if foreign matter such as water or mud is splashed up by the front wheel 23, the front fender 24 protects the housing 61 from the foreign matter. The front fender 24 prevents foreign matter from entering the housing 61 through the air intake holes 62, preventing the adhesion of foreign matter to the headlamp 51.

[0033] In this embodiment, the air intake holes and heat exhaust holes are formed in the housing by utilizing the wire passage holes, but the air intake holes and heat exhaust holes may be formed in the housing separately from the wire passage holes.

[0034] Furthermore, in this embodiment, grooves and slopes are formed in the front fender, but as long as the wind from traveling passes through the gap between the lamp cover and the front fender and is directed toward the intake hole, grooves and slopes do not have to be formed in the front fender.

[0035] In addition, in this embodiment, the heat exhaust holes are formed from the top surface to the rear surface of the housing, but it is sufficient that the heat exhaust holes are formed at least on the top surface of the housing.

[0036] The heat dissipation structure of this embodiment is not limited to the saddle-ride type vehicle described above, and may be adopted in other types of saddle-ride type vehicles. Note that the saddle-ride type vehicle is not limited to all vehicles in which the rider sits astride the seat, but also includes scooter-type vehicles in which the rider does not sit astride the seat.

[0037] As described above, the first aspect is a heat dissipation structure for a headlamp (51) that illuminates the area ahead of a vehicle, and includes a lamp cover (41) that covers the periphery of the headlamp lens (52), a housing (61) that covers the rear of the headlamp from the rear, and a front fender (24) installed below the housing. The housing has an air intake hole (62) formed in its lower surface and a heat exhaust hole (63) formed in its upper surface, with the front fender (24) positioned below the air intake hole. With this configuration, traveling wind enters through the air intake hole on the lower surface of the housing and hot air is pushed out through the heat exhaust hole on the upper surface of the housing, improving the heat dissipation performance of the headlamp. Even if foreign objects such as water or mud are splashed up by the front wheel, the front fender protects the housing from the foreign objects. The front fender prevents foreign objects from entering the housing through the air intake hole, preventing the foreign objects from adhering to the headlamp.

[0038] In the second aspect, in the first aspect, a groove (66) is formed on the upper surface of the front fender, extending from a position forward of the front surface of the lamp cover to a position rearward of the front surface of the lamp cover. With this configuration, even if the gap between the lamp cover and the front fender is narrowed to prevent foreign matter from entering, the groove in the front fender can still guide sufficient airflow into the intake holes in the housing.

[0039] In the third aspect, in the second aspect, the underside (45) of the lamp cover faces the groove in the front fender, and the underside of the lamp cover is inclined so that the rear end of the underside is lower than the front end of the underside. With this configuration, the gap between the lamp cover and the front fender prevents foreign matter from entering, and the inclination of the underside of the lamp cover guides the wind generated by driving into the groove in the front fender.

[0040] In a fourth aspect, in the second or third aspect, a slope (67) that increases in height toward the rear is formed on the rear side of the groove of the front fender, and the rear end of the slope of the front fender is located rearward of the front end (64) of the lower surface of the housing. With this configuration, the slope of the front fender guides the airflow toward the intake holes of the housing, thereby improving the heat dissipation performance of the headlamp.

[0041] In a fifth aspect, in the fourth aspect, an intake hole is formed in a recess (65) provided on the underside of the housing, and a slope of the front fender fits into the recess of the housing. With this configuration, the gap between the recess and the slope prevents foreign matter from entering, and the inclination of the slope guides the airflow from traveling to the intake hole.

[0042] A sixth aspect is any one of the first to fifth aspects, further comprising a meter (28) attached to the upper surface of the housing and positioned above the heat release hole. With this configuration, even if foreign matter such as rain or snow falls from above, the meter prevents the foreign matter from entering the housing through the heat release hole.

[0043] In a seventh aspect, in the sixth aspect, a heat exhaust hole is formed below the meter from the top surface to the rear surface of the housing. With this configuration, the meter can prevent foreign matter from entering the heat exhaust hole, while allowing hot air inside the housing to be exhausted to the outside.

[0044] Although the present embodiment has been described, other embodiments may be made by combining the above-described embodiments and modifications in whole or in part.

[0045] Furthermore, the technology of the present invention is not limited to the above-described embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to technological advances or other derived technologies, it may be implemented using that method. Therefore, the claims cover all embodiments that may fall within the scope of the technical idea. [Explanation of symbols]

[0046] 24: Front fender 28: Meter 41: Lamp cover 45: Underside of lamp cover 51: Headlamp 52: Lens 61: Housing 62: Air intake hole 63: Heat exhaust hole 64: Front end of the bottom of the housing 65: Recess 66: Groove 67: Slope

Claims

1. A heat dissipation structure for a headlamp that illuminates the front of a vehicle, a lamp cover that covers the periphery of the headlamp lens; a housing that covers the rear surface of the headlamp from the rear side; a front fender installed below the housing, a heat dissipation structure for a headlamp, wherein an air intake hole is formed in the lower surface of the housing, a heat dissipation hole is formed in the upper surface of the housing, and the front fender is located below the air intake hole.

2. 2. The headlamp heat dissipation structure according to claim 1, wherein a groove portion is formed on the upper surface of the front fender, the groove portion extending from a position forward of the front surface of the lamp cover to a position rearward of the front surface of the lamp cover.

3. The lower surface of the lamp cover faces the groove portion of the front fender, 3. The headlamp heat dissipation structure according to claim 2, wherein the lower surface of the lamp cover is inclined so that the rear end of the lower surface of the lamp cover is lower than the front end of the lower surface.

4. A slope that increases in height toward the rear is formed on the rear side of the groove of the front fender, 4. The headlamp heat dissipation structure according to claim 2, wherein a rear end of the slope of the front fender is located rearward of a front end of the lower surface of the housing.

5. The intake hole is formed in a recess provided on the lower surface of the housing, 5. The headlamp heat dissipation structure according to claim 4, wherein the slope of the front fender is recessed into the recess of the housing.

6. a meter attached to the top surface of the housing; 3. The headlamp heat dissipation structure according to claim 1, wherein the meter is located above the heat dissipation hole.

7. 7. The headlamp heat dissipation structure according to claim 6, wherein the heat dissipation hole is formed below the meter from the upper surface to the rear surface of the housing.

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