JP2016081892A - Ventilation structure of vehicle lighting appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the ventilation performance of a vehicle lighting appliance while suppressing the intrusion of foreign matters into the vehicle lighting appliance.SOLUTION: A headlight-side end 52 of a communication pipe 50 is connected to a ventilation port 40 of a headlight 20. A cylinder member 60 is arranged inside the headlight 20 in a vehicle width direction. The cylinder member 60 is arranged along the vehicle width direction, an upstream-side opening part 62 is opened at a front side of a vehicle fore-and-aft direction, and a downstream-side opening part 64 is opened at a rear side of the vehicle fore-and-aft direction. A cylinder-member side connecting part 54 of the communication pipe 50 is connected to a diameter-contracted part 72 of the cylinder member 60. The cylinder-member side connecting part 54 of the communication pipe 50 is extended to the inside of the cylinder member 60, and bent to a downstream side (rear side of vehicle fore-and-aft direction), and a communication pipe opening part 56 is opened at a low-pressure part 74 toward a downstream side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a ventilation structure for a vehicular lamp.

  A vehicle in which a bulb that is a light source, a reflector that reflects light from the bulb, and an extension that covers a gap between the reflector and the housing are housed in a lamp chamber that is separated by a housing and a lens that covers the opening. Lamps are known. Then, a breathing hole is formed in the rear surface of the housing in such a vehicle lamp, the lamp chamber is communicated with the outside through the breathing hole, and the lamp chamber is ventilated by air convection due to a temperature difference in the lamp chamber. Therefore, it has been conventionally performed to suppress the fogging of the inner surface of the lens.

  Patent Document 1 discloses a technique for forcibly cooling the lighting control circuit by forcibly flowing outside air into a space surrounded by the reflector and the lamp housing in the vehicle headlamp and accommodating the lighting control circuit. In this prior art, outside air is forced to flow by connecting via a connecting pipe to a venturi in which traveling wind flows and generates negative pressure in the space that houses the lighting control circuit.

  However, in the above prior art, the connecting pipe is opened in the peripheral wall of the venturi. Therefore, since the negative pressure is small when the traveling wind is slow, it is conceivable that the traveling wind flowing through the venturi enters the connecting pipe and further enters the vehicle headlamp from the connecting pipe. Therefore, there is room for improvement in this respect.

JP 2002-124123 A

  An object of the present invention is to improve the ventilation performance of a vehicular lamp while preventing the traveling wind from entering the vehicular lamp in consideration of the above facts.

  The ventilation structure for a vehicular lamp according to claim 1 includes a vehicular lamp provided with an intake port and an exhaust port, an upstream opening into which a travel wind taken in during travel of the vehicle is introduced, and the travel wind is discharged. A downstream opening, a first end connected to the exhaust port of the vehicular lamp, one end connected to the exhaust port of the vehicular lamp, and the other end connected to the tube A communication pipe that is connected between the upstream opening and the downstream opening of the member and that extends inward and opens toward the downstream side in the direction of ventilation of the traveling wind.

  In the ventilating structure for a vehicle lamp according to the first aspect, the traveling wind taken during traveling of the vehicle is introduced from the upstream opening of the tubular member and discharged from the downstream opening.

  The region where the other end portion of the communication pipe in the cylindrical member is connected and opened has a smaller area (ventilation area) for ventilation by the area of the other end portion. Therefore, due to the Venturi effect, the flow velocity of the traveling wind increases and the negative pressure increases around the other end of the communication pipe. Therefore, the suction force due to the negative pressure is increased, and the ventilation performance of the vehicular lamp is improved.

  Further, the other end of the communication pipe extends inside the cylindrical member and opens toward the downstream side in the ventilation direction of the traveling air of the cylindrical member. Therefore, even when the traveling wind is slow and the negative pressure is small, the traveling wind does not enter from the opening at the other end of the communication pipe. Therefore, invasion of the running wind into the vehicular lamp is prevented. Moreover, since the invasion of the running wind into the vehicular lamp is prevented, for example, foreign matter can be prevented from entering the vehicular lamp together with the running wind.

  Therefore, the ventilation performance in the vehicular lamp is improved while preventing the traveling wind from entering the vehicular lamp.

  The ventilation structure for a vehicular lamp according to claim 2 is the structure according to claim 1, wherein an intake port for taking in the traveling wind is provided at the front end portion of the vehicle, and the upstream side of the cylindrical member is provided at the intake port. Side openings are connected.

  In the ventilation structure for a vehicle lamp according to claim 2, the traveling wind is efficiently taken in and the traveling wind is efficiently taken in from the intake opening by providing the intake port for taking in the traveling wind at the front end of the vehicle. Is introduced into the upstream opening of the tubular member. Accordingly, since the air volume (wind speed) of the traveling wind passing through the cylindrical member is ensured, the suction force due to the negative pressure is increased, and the ventilation performance of the vehicular lamp is further improved.

  The ventilation structure for a vehicular lamp according to claim 3 is the structure according to claim 1 or 2, wherein a ventilation area of a portion of the cylindrical member where the other end of the communication pipe is opened is the upstream side. It is set to be smaller than the opening cross-sectional area of the opening.

  In the ventilation structure for a vehicular lamp according to a third aspect of the present invention, the ventilation area of the portion of the tubular member where the other end of the communication pipe is opened is smaller than the opening cross-sectional area of the upstream opening. Therefore, due to the venturi effect, the flow velocity of the traveling wind at the portion where the other end of the communication pipe in the cylindrical member is opened increases, and the negative pressure increases. Accordingly, the suction force due to the negative pressure is increased, and the ventilation performance of the vehicular lamp is further improved.

  The ventilation structure for a vehicle lamp according to claim 4 is the structure according to any one of claims 1 to 3, wherein a filter for capturing foreign matter or a maze structure is provided in the exhaust port or the communication pipe. Is provided.

  In the ventilating structure for a vehicle lamp according to claim 4, even if foreign matter such as water or dust that has entered the tubular member due to traveling wind enters from the communication pipe, it is captured by the foreign matter capturing filter or the maze structure. Accordingly, foreign matter such as water and dust is prevented from entering the vehicle lamp from the exhaust port via the communication pipe.

  The ventilation structure for a vehicle lamp according to claim 5 is the structure according to any one of claims 1 to 4, wherein the downstream opening is positioned below the upstream opening. Is set to

  In the vehicle lamp ventilation structure according to the fifth aspect, the downstream opening is positioned below the upstream opening. Therefore, foreign matters such as water and dust that have entered the cylindrical member are likely to be discharged from the downstream opening. Accordingly, foreign matter such as water and dust is prevented from entering the vehicle lamp from the exhaust port via the communication pipe.

  The ventilation structure for a vehicle lamp according to a sixth aspect is the structure according to any one of the first to fifth aspects, wherein the exhaust port is provided at one end of the vehicle lamp in the vehicle width direction. In addition, the intake port is provided at the other end of the vehicle lamp in the vehicle width direction.

  In the vehicle lamp lighting structure according to the sixth aspect, the air is sucked from the air inlet at the other end of the vehicle lamp in the vehicle width direction and is exhausted from the air outlet at the one end in the vehicle width direction. Therefore, ventilation is performed over substantially the entire region of the vehicle lamp in the vehicle width direction. Therefore, the ventilation performance of the vehicular lamp is further improved.

  According to the first aspect of the present invention, it is possible to improve the ventilation performance in the vehicular lamp while preventing the traveling wind from entering the vehicular lamp.

  According to invention of Claim 2, the ventilation performance in a vehicle lamp can further be improved.

  According to invention of Claim 3, the ventilation performance in a vehicle lamp can further be improved.

  According to invention of Claim 4, the penetration | invasion of the foreign material in a vehicle lamp can be suppressed.

  According to the invention described in claim 5, it is possible to suppress the entry of foreign matter into the vehicular lamp.

  According to the sixth aspect of the present invention, the ventilation performance of the vehicular lamp can be further improved.

1 is a front view of a vehicle to which a ventilation structure for a vehicle lamp according to the present invention is applied. It is a horizontal sectional view of the headlight to which the ventilation structure of the vehicular lamp of the first embodiment of the present invention is applied. It is a horizontal sectional view of the important section of the ventilation structure of the vehicular lamp of the first embodiment of the present invention. It is a vertical sectional view along the vehicle front-back direction of the cylinder member and communication pipe which constitute the ventilation structure of the vehicular lamp of a first embodiment of the present invention. It is a horizontal sectional view of the cylinder member and communication pipe which constitute the ventilation structure of the vehicular lamp of a second embodiment of the present invention. It is a horizontal sectional view of the important section of the headlight to which the ventilation structure of the vehicular lamp of the third embodiment of the present invention is applied. It is a graph which shows the relationship between the surface temperature of the inner surface of a lens, and the dew point temperature in a headlight (lamp room | chamber interior) in the headlight to which the cylinder member was connected, and the headlight of the comparative example to which the cylinder member is not connected. It is sectional drawing of a maze structure part.

<First embodiment>
The ventilation structure of the vehicular lamp according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4 and FIG. 7.

(Construction)
As shown in FIG. 1, headlights 20 as an example of a pair of left and right vehicle lamps are disposed at both ends of the vehicle front end 16 of the vehicle 10 in the vehicle width direction. The shape of the headlight 20 viewed from the front is a substantially parallelogram shape whose longitudinal direction is the vehicle width direction.

  As shown in FIGS. 1 and 2, the vehicle width direction outer side portion of the headlight 20 is curved to the rear side in the vehicle front-rear direction and wraps around the fender 14 side on the front wheel 12 (see FIG. 1).

  In the following description, the right headlight 20 and a cylindrical member 60 described later are illustrated and described, but the left headlight 20 and the cylindrical member 60 have the same structure except that they are symmetrical.

  As shown in FIG. 2, the headlight 20 includes a resin housing 22 in which an opening 23 having an opening on the front side in the vehicle front-rear direction is formed. A lens 24 is assembled in the opening 23 of the housing 22 (see also FIG. 1). A joint portion between the outer peripheral edge of the lens 24 and the opening 23 of the housing 22 is sealed by a seal member (not shown). In the present embodiment, a space formed by the housing 22 and the lens 24 is a lamp chamber 26.

  The lamp chamber 26 is provided with a concave mirror surface (saddle shape) reflector 28 and a reflector 29 that reflect light forward in the vehicle front-rear direction, arranged side by side in the vehicle width direction. A beam valve 30 as an example of a light source is disposed at a substantially central predetermined position of the reflector 28, and a beam valve 31 as an example of a light source is disposed at a substantially central predetermined position of the reflector 29.

  Resin extensions 32 and 34 are provided between the outer edge portions of the reflectors 28 and 29 in the lamp chamber 26 and the housing 22.

  An intake port 36 that opens toward the rear side in the vehicle front-rear direction is formed at the rear end of the housing 22 (lamp chamber 26) on the outer side in the vehicle width direction. The intake port 36 is provided with an intake port side filter 38 for capturing foreign matter. The inlet side filter 38 is detachable (replaceable).

  An exhaust port 40 that opens toward the rear side in the vehicle front-rear direction is formed at the rear end of the housing 22 (lamp chamber 26) in the vehicle width direction. A headlight side end 52 of a communication pipe 50 (see FIG. 3) described later is connected to the exhaust port 40. An exhaust port side filter 42 for capturing foreign matter is provided at a connection portion between the headlight side end portion 52 of the communication pipe 50 and the exhaust port 40.

  As shown in FIG. 3, a tubular member 60 is disposed inside the headlight 20 in the vehicle width direction. As shown in FIGS. 3 and 4, the tubular member 60 is disposed along the vehicle front-rear direction, and an upstream opening 62 opens on the front side of the vehicle front-rear direction, and a downstream opening on the rear side of the vehicle front-rear direction. 64 is open. Further, as shown in FIG. 4, the cylindrical member 60 is disposed to be inclined downward as it goes rearward in the vehicle front-rear direction, and the downstream opening 64 of the cylindrical member 60 is more downstream than the upstream opening 62. Is located on the lower side.

  As shown in FIG. 3, the upstream opening 62 of the cylindrical member 60 is connected to an intake port 18 provided on the inner side in the vehicle width direction of the headlight 20 in the front grille 19 of the vehicle front end portion 16 shown in FIG. 1. Yes. As shown in FIG. 3, when the vehicle travels, the cylindrical member 60 introduces the traveling wind taken from the intake port 18 into the cylindrical member 60 from the upstream opening 62 and discharges it from the downstream opening 64. It is configured to be. In addition, the arrow V of FIG. 3 has shown the flow of driving | running | working wind.

  As shown in FIGS. 3 and 4, the front portion of the cylindrical member 60 is a reduced diameter portion 72 that is reduced in diameter toward the downstream side of the traveling wind V (in the present embodiment, the rear side in the vehicle front-rear direction). A negative pressure portion 74 having a constant or substantially constant cylinder diameter (the reason for the negative pressure will be described later) is formed on the downstream side of the traveling wind V of the reduced diameter portion 72 (the rear side in the vehicle longitudinal direction in this embodiment). Yes. On the downstream side of the traveling wind V of the negative pressure portion 74 (the rear side in the vehicle front-rear direction in the present embodiment), a diameter-expanded portion 76 that has a diameter increased toward the downstream side is formed.

  As shown in FIG. 3, the above-described tube member side connection portion 54 of the communication pipe 50 is connected to the reduced diameter portion 72 of the tube member 60. As shown in FIGS. 3 and 4, the tubular member side connection portion 54 of the communication pipe 50 extends inside the tubular member 60 and is curved downstream (rear side in the vehicle front-rear direction), and the negative pressure portion 74. The communication pipe opening 56 opens toward the downstream side.

As shown in FIG. 4, the opening cross-sectional area of the upstream opening 62 in the cylindrical member 60 is S11, the ventilation area of the negative pressure portion 74 is S12, and the opening cross-sectional area of the downstream opening 64 is S14. If the opening cross-sectional area of the 50 communicating pipe openings 56 is S13,
S11>S12> S13
S12 <S14
Is set to

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  As shown in FIG. 3, the traveling wind V taken in from the intake port 18 (see FIG. 1) of the vehicle front end portion 16 during vehicle traveling is introduced from the upstream opening 62 of the tubular member 60 and the downstream opening 64. Discharged from. A negative pressure is generated around the communication pipe opening 56 of the communication pipe 50 due to a difference in speed between the traveling wind V passing through the cylindrical member 60 and the headlight 20 (in the lamp chamber 26). Air is sucked from the tube 50.

  By this suction, as shown in FIG. 2, the air in the headlight 20 (in the lamp chamber 26) is exhausted from the exhaust port 40, whereby the inside of the headlight 20 is ventilated. In the present embodiment, as in the ventilation wind indicated by the arrow Q, outside air is sucked from the intake port 36 at the rear end of the headlight 20 (the lamp chamber 26) in the vehicle width direction, and is applied to the inner surface 24A of the lens 24. It flows along the vehicle width direction and is exhausted from the exhaust port 40 at the rear end portion on the inner side in the vehicle width direction. Therefore, substantially the entire region (between both ends) of the headlight 20 (lamp chamber 26) in the vehicle width direction is effectively ventilated.

  Here, as shown in FIGS. 3 and 4, the tubular member side connection portion 54 of the communication pipe 50 extends into the cylindrical member 60 and is curved downstream, and the negative pressure portion 74 opens the communication pipe. The part 56 is opened toward the downstream side. Therefore, in the negative pressure portion 74 of the cylindrical member 60, the cross-sectional integration of the communication pipe opening 56 and the region (ventilation area) through which the traveling wind V passes are narrowed.

  Further, the cylindrical member 60 is formed with a reduced diameter portion 72 having a diameter reduced from the upstream opening 62 toward the negative pressure portion 74, and the ventilation area of the negative pressure portion 74 is larger than the opening cross-sectional area S 11 of the upstream opening 62. S12 is narrower (S11> S12).

  Thus, the flow velocity of the traveling wind V increases due to the venturi effect due to the narrow ventilation region (area) of the negative pressure portion 74 in the cylindrical member 60. Therefore, the negative pressure around the communication pipe opening 56 of the communication pipe 50 increases.

  Furthermore, as indicated by the arrow V <b> 1, the traveling wind merges at the downstream side of the communication tube opening 56 of the tube member side connection portion 54 of the communication tube 50 by the reduced diameter portion 72. Therefore, the negative pressure around the communication pipe opening 56 of the communication pipe 50 increases.

  In addition, the downstream side of the cylindrical member 60 is enlarged to form an enlarged diameter part 76, and the opening cross-sectional area S14 of the downstream side opening 64 is larger than the ventilation area S12 of the negative pressure part 74 (S12 <S14). ). Therefore, the exhaust resistance of the traveling wind V is lowered and the exhaust is smoothly performed.

  Thus, since the negative pressure is large and the traveling wind V is smoothly exhausted, the suction force is increased, and the ventilation performance of the headlight 20 is improved. In addition, suction force (ventilation performance) is ensured even during low-speed traveling.

  Further, by providing the intake port 18 (see FIG. 1) for taking in the traveling wind V in the vehicle front end portion 16, for example, the traveling wind V is taken in more efficiently than in the case where the intake port is provided in the vehicle side portion. It is. The traveling wind V thus efficiently taken in from the intake port 18 is introduced into the upstream opening 62 of the cylindrical member 60. Therefore, since the air volume (wind speed) of the traveling wind V passing through the tubular member 60 is ensured, the suction force due to the negative pressure is increased, and the ventilation performance of the headlight 20 (the lamp chamber 26) is improved.

  As shown in FIGS. 3 and 4, the tubular member side connection portion 54 of the communication pipe 50 is connected to the cylindrical member 60 and extends into the tubular member 60, and the communication pipe opening 56 is directed toward the downstream side. It is open. Therefore, the traveling wind V is prevented from entering from the communication tube opening 56 of the communication tube 50.

  Accordingly, foreign matter such as water and dust that has entered the tubular member 60 due to the traveling wind V is prevented from entering the headlight 20 (lamp chamber 26) from the communicating tube opening 56 of the communicating tube 50 together with the traveling wind V. .

  Further, as shown in FIG. 4, the tubular member 60 has the downstream opening 64 positioned on the lower side of the upstream opening 62. Therefore, foreign matters such as water and dust that have entered the cylindrical member 60 due to the traveling wind V are likely to be discharged from the downstream opening 64 even when the traveling wind V is not ventilated (when not traveling).

  As shown in FIGS. 2 and 3, an exhaust port side filter 42 is provided at a connection portion between the headlight side end 52 of the communication pipe 50 and the exhaust port 40.

  Therefore, even if foreign matter such as water or dust enters the communication pipe 50, it is captured by the exhaust port side filter 42 described above, so that water, dust, or the like is discharged from the exhaust port 40 of the headlight 20 through the communication pipe 50. Intrusion of foreign matter into the lamp chamber 26 of the headlight 20 is suppressed or prevented. The foreign matter captured by the exhaust port side filter 42 is discharged into the cylindrical member 60 by the ventilation air Q during traveling.

  Further, as shown in FIG. 2, an intake port side filter is provided at the intake port 36 that opens toward the rear side in the vehicle front-rear direction of the rear end portion of the housing 22 (lamp chamber 26) of the headlight 20 on the outer side in the vehicle width direction. 38 is provided. Therefore, foreign matters such as water and dust are captured by the air inlet side filter 38, so that intrusion of foreign matters into the headlight 20 (inside the lamp chamber 26) is prevented or suppressed. The inlet side filter 38 is detachable (replaceable). Therefore, even if foreign matter is trapped in the intake side filter 38, the intake performance (ventilation performance) is restored by replacing the intake side filter 38.

  Here, the temperature of the headlight 20 (the lamp chamber 26) rises due to heat from an engine (not shown), radiation heat of sunlight, heat when the beam bulbs 30 and 31 are turned on, and the like. . Due to this temperature rise, moisture is released from the resin components (for example, the housing 22) constituting the headlight 20 into the headlight 20 (in the lamp chamber 26), and the dew point temperature in the headlight 20 (in the lamp chamber 26) (absolute Humidity) increases.

  As described above, the dew point temperature (absolute humidity) in the headlight 20 (in the lamp chamber 26) is increased, and each member in the headlight 20 (in the lamp chamber 26) due to a car wash, rain, a decrease in the outside air temperature, or the like. Condensation occurs when the surface temperature of the liquid drops below the dew point temperature. In particular, since the temperature of the inner surface 24A of the lens 24 of the headlight 20 tends to decrease, condensation tends to occur on the inner surface 24A of the lens 24.

  However, in the headlight 20 of the present embodiment, air is sucked from the communication pipe 50 by the negative pressure formed in the cylindrical member 60 as described above. Then, the ventilation air Q sucked from the intake port 36 at the rear end portion outside the vehicle width direction of the headlight 20 by this suction flows along the inner surface 24A of the lens 24 and is exhausted from the rear end portion inside the vehicle width direction. It exhausts from the opening | mouth 40 (refer FIG. 2). Thus, by ventilating the inside of the headlight 20 (in the lamp chamber 26), moisture released from the resin parts into the headlight 20 (inside the lamp chamber 26) is discharged, and the dew point temperature (absolute humidity) is increased. Decrease (dew point temperature (absolute humidity) becomes the same level as the outside air).

  Therefore, it is prevented or suppressed that the surface temperature of each member in the headlight 20 (in the lamp chamber 26), particularly the inner surface 24A of the lens 24, is lower than the dew point temperature due to car washing, rain, and a decrease in the outside air temperature. As a result, the occurrence of condensation on the inner surface 24A of the lens 24 is prevented or suppressed.

  The graph of FIG. 7 shows the surface temperature of the inner surface 24A of the lens 24 and the inside of the headlight in the headlight 20 to which the cylindrical member 60 of the present embodiment is connected and the headlight of the comparative example to which the cylindrical member 60 is not connected. The relationship with the dew point temperature in the lamp chamber 26 is shown. Note that the solid line is the dew point temperature of the headlight 20 of the present embodiment, the broken line (dotted line) is the dew point temperature of the headlight of the comparative example, and the dashed line is the surface temperature of the inner surface 24A of the lens 24.

  In addition, the initial state is a state in which the resin parts constituting the headlight contain the most moisture. Specifically, the vehicle is parked (leaved) for a long time in the humid summer.

  When the engine is started from the initial state, the light is turned on, and idling is started, the dew point temperature in the headlight (in the lamp chamber 26) rises and becomes higher than the surface temperature of the inner surface 24A of the lens 24, causing condensation. .

  However, when traveling (in this example, 50 km / h) is started, the dew point temperature (absolute humidity) and the surface temperature of the inner surface 24 </ b> A of the lens 24 decrease for both the headlight 20 of the embodiment and the headlight of the comparative example. Since the headlight 20 of this embodiment has improved ventilation performance, the dew point temperature is lower than the surface temperature of the inner surface 24A of the lens 24, and condensation is eliminated. On the other hand, since the headlight of the comparative example does not have sufficient ventilation performance, the dew point temperature remains higher than the surface temperature of the inner surface 24A of the lens 24, and dew condensation is not eliminated.

  Further, when the vehicle is stopped after the running and is in an idling state, since the moisture is released from the resin parts constituting the headlight, the release of moisture from the resin parts is small. Since the headlight 20 of the present embodiment is ventilated during traveling and has an absolute humidity similar to that of the outside air, the dew point temperature is maintained lower than the surface temperature of the inner surface 24A of the lens 24, and condensation occurs. Prevented or suppressed. On the other hand, since the headlight of the comparative example has insufficient ventilation performance and high absolute humidity, the dew point temperature is higher than the temperature of the inner surface 24A of the lens 24, and condensation occurs.

<Second embodiment>
The ventilation structure of the vehicular lamp according to the second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment, and the overlapping description is abbreviate | omitted.

(Construction)
Since the structure of the headlight 20 is the same as that of the first embodiment, the description thereof is omitted. The communication pipe 150 of the present embodiment is the same as the communication pipe 50 of the first embodiment (see FIGS. 3 and 4) except for the cylindrical member side connection portion 154.

  As shown in FIG. 5, the cylindrical member 160 of the second embodiment has a shape curved in an L shape in a plan view, and an upstream opening 162 opens on the front side in the vehicle front-rear direction. A downstream opening 164 is opened inside.

  An upstream portion 172 of the cylindrical member 160 extends rearward in the vehicle front-rear direction, and a curved portion 178 curved in an arc shape is formed at the downstream end. The downstream portion 176 of the cylindrical member 160 extends from the outside in the vehicle width direction on the downstream side of the upstream portion 172 to the inside in the vehicle width direction. Further, the downstream portion 176 is enlarged in diameter toward the inner side in the vehicle width direction. Note that a joint end portion of the downstream portion 176 with the upstream portion 172 is referred to as a negative pressure portion 174.

  A tubular member side connecting portion 154 of the communication pipe 150 is connected to a wall surface on the outer side in the vehicle width direction of the upstream portion 172 of the tubular member 160. The tubular member side connecting portion 154 of the communication pipe 150 extends toward the downstream opening 164 inside the tubular member 160, and the communication pipe opening 156 opens toward the downstream side in the negative pressure portion 174. Yes. Further, the cylindrical member side connection portion 154 is reduced in diameter toward the communication tube opening 156.

Note that the opening cross-sectional area of the upstream opening 162 in the cylindrical member 160 is S21, the ventilation area of the negative pressure part 174 is S22, the opening cross-sectional area of the downstream opening 164 is S24, and the communication pipe opening of the communication pipe 150 If the opening cross-sectional area of the portion 156 is S23,
S21>S22> S23
S22 <S24
Is set to

(Function and effect)
Next, functions and effects of the present embodiment will be described. In addition, since description overlaps with the effect | action and effect similar to 1st embodiment, description is abbreviate | omitted.

  The tubular member side connecting portion 154 of the communication pipe 150 extends toward the downstream opening 164 inside the tubular member 160, and the communication pipe opening 156 opens in the negative pressure portion 174. Therefore, the negative pressure portion 174 of the cylindrical member 160 has a narrow area (area) through which the traveling wind V is vented by the area of the communication pipe opening 156.

  Furthermore, in the cylindrical member 160, the ventilation area S22 of the negative pressure portion 174 is narrower than the opening cross-sectional area S21 of the upstream opening 162 (S21> S22).

  As described above, the flow area of the negative pressure portion 174 in the cylindrical member 160 is narrowed, so that the flow velocity of the traveling wind V is increased due to the venturi effect. Therefore, the negative pressure around the communication tube opening 156 of the communication tube 150 increases.

  Further, as indicated by the arrow V2, the traveling wind is merged downstream of the communication pipe opening 156 of the cylindrical member side connection portion 154 by the wall surface 154A of the cylindrical member side connection portion 154 that is reduced in diameter toward the downstream side. To do. Therefore, the negative pressure around the communication tube opening 156 of the communication tube 150 increases.

  Moreover, the downstream part 176 of the cylindrical member 160 is expanded in diameter, and the opening cross-sectional area S24 of the downstream opening 164 is larger than the ventilation area S22 of the negative pressure part 174 (S22 <S24). Therefore, the exhaust resistance of the traveling wind V is lowered and the exhaust is smoothly performed.

  Thus, since the negative pressure is large and the traveling wind V is smoothly exhausted, the suction force is increased, and the ventilation performance of the headlight 20 is improved. In addition, suction force (ventilation performance) is ensured even during low-speed traveling.

  Further, the tubular member side connecting portion 154 of the communicating pipe 150 is connected to the tubular member 160 and extends into the tubular member 160, and the communicating pipe opening 156 opens toward the downstream side. Therefore, the traveling wind V is prevented from entering from the communication tube opening 156 of the communication tube 150.

  Accordingly, foreign matter such as water and dust that has entered the cylindrical member 160 due to the traveling wind V is prevented from entering the headlight 20 (lamp chamber 26) together with the traveling wind V from the communicating tube opening 156 of the communicating tube 150. .

<Third embodiment>
A ventilation structure for a vehicle lamp according to a third embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment and 2nd embodiment, and the overlapping description is abbreviate | omitted.

(Construction)
As shown in FIG. 6, the headlight 200 of the present embodiment has a substantially similar structure except for the arrangement structure of the headlight 20 (see FIG. 2) and the exhaust port 40 of the first embodiment.

  An exhaust port 240 that opens toward the inner side in the vehicle width direction is formed at a side end portion of the housing 222 (lamp chamber 26) of the headlight 200 on the inner side in the vehicle width direction. An end 252 of the communication pipe 250 is connected to the exhaust port 240 at the side end. Further, an exhaust port side filter 42 for capturing foreign matter is provided at a connection portion between the end 252 of the communication pipe 250 and the exhaust port 240.

  The cylinder member to which the communication pipe 250 is connected is the cylinder member 60 (see FIGS. 3 and 4) of the first embodiment or the cylinder member 160 of the second embodiment. The tubular member side connecting portion of the communication pipe 250 has the same structure as the tubular member side connecting portion 54 or the tubular member side connecting portion 154 connected to the tubular member 60 or the tubular member 160.

(Function and effect)
Next, functions and effects of the present embodiment will be described.

  A communication pipe opening (communication pipe opening) of the communication pipe 250 in the cylindrical member (the cylindrical member 60 or the cylindrical member 160) by the traveling wind V taken in from the intake port 18 (see FIG. 1) of the vehicle front end portion 16 when the vehicle travels. A negative pressure is generated around the portion 56 or the communication tube opening 156), and air is sucked from the communication tube 250 by this negative pressure (see FIGS. 3 to 5).

  Due to this suction, outside air is sucked from the intake port 36 (see FIG. 2) at the rear end of the headlight 200 (the lamp chamber 26) in the vehicle width direction as in the ventilation wind Q shown in FIG. It flows along the inner surface 24A and is exhausted from the exhaust port 240 at the side end on the inner side in the vehicle width direction.

  The exhaust port 240 of the present embodiment is opened toward the inner side in the vehicle width direction at the side end portion on the inner side in the vehicle width direction of the housing 222 (lamp chamber 26) of the headlight 200. Therefore, the ventilation air Q flowing along the inner surface 24A of the lens 24 is exhausted from the exhaust port 240 without being bent greatly, and thus the exhaust resistance is small. Therefore, the ventilation performance of the headlight 200 (lamp chamber 26) is improved.

<Others>
The present invention is not limited to the above embodiment.

For example, in the above embodiment, the ventilation areas S12, S22 of the negative pressure portions of the cylindrical members 60, 160 and the opening cross-sectional areas S14, S24 of the downstream openings 64, 164 are:
S12 <S14
S22 <S24
However, the present invention is not limited to this.

S12 = S14
S22 = S24
May be set.

  Further, for example, the cylindrical member 160 of the second embodiment shown in FIG. 5 has a shape curved in an L shape in plan view, and an upstream opening 162 is opened on the front side in the vehicle front-rear direction, and a downstream opening is formed. The part 164 was disposed so as to open.

  However, the cylindrical member 160 of the second embodiment may be disposed such that the downstream opening 164 opens toward the lower side in the vehicle width direction (arrangement in which the arrow OUT in FIG. 5 points to the lower side). In this case, foreign matter such as water and dust that has entered the cylindrical member 160 is likely to fall and be discharged from the downstream opening 164 even when the traveling wind V is not ventilated (when not traveling). . Furthermore, since the communication pipe opening 156 of the communication pipe 150 is open downward, it has a structure in which foreign matter does not easily enter the communication pipe 150. In addition, even if a foreign substance enters the communication pipe 150, it falls.

  For example, as shown in FIG. 1, the intake 18 for the traveling wind V is provided on the inner side in the vehicle width direction of the headlight 20 in the front grille 19 of the vehicle front end portion 16, but is not limited thereto. As long as traveling wind V can be taken in, it may be provided anywhere. However, from the viewpoint of capture efficiency, it is desirable to provide the intake port 18 at the vehicle front end portion 16 indicated by a one-dot broken line in FIG. Moreover, the upstream opening part and intake port of a cylinder member may be connected with connection pipes, such as a tube.

  For example, although the exhaust port side filter 42 was provided in the connection site | part with the exhaust port 40, it is not limited to this. The communication pipes 50 and 150 may be provided between the exhaust port 40 and the communication pipe openings 56 and 156, or may be provided in the communication pipe openings 56 and 156.

  Further, for example, a foreign matter capturing member or mechanism other than the exhaust port side filter 42 may be provided. For example, the maze structure unit 300 shown in FIG. 8 may be used. The labyrinth structure part 300 has a structure in which the rib 310 and the rib 312 are alternately formed on the inner wall 302A of the communication pipe 302 so as to overlap each other in the axial direction, so that foreign matter does not easily enter.

  Furthermore, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

16 Vehicle front end 18 Intake port 20 Headlight (vehicle lamp)
36 Intake port 40 Exhaust port 42 Exhaust port filter (filter)
50 Communication pipe 52 Headlight side end (one end)
54 Tube member side connection (other end)
60 cylinder member 62 upstream opening 64 downstream opening 150 communication pipe 154 cylinder member side connection (other end)
160 Cylindrical member 162 Upstream opening 164 Downstream opening 240 Exhaust port 250 Communication pipe 252 Headlight side end (one end)
260 Tube member 300 Maze structure

Claims (6)

A vehicle lamp provided with an air inlet and an air outlet;
A cylindrical member having an upstream opening into which traveling wind taken in during vehicle travel is introduced, and a downstream opening through which the traveling wind is discharged;
One end is connected to the exhaust port of the vehicular lamp, and the other end is connected between the upstream opening and the downstream opening of the tubular member and extends to the inside. A communication pipe opened toward the downstream side in the ventilation direction of
Ventilation structure for vehicular lamps. The front end of the vehicle is provided with an intake for taking in the running wind,
The upstream opening of the cylindrical member is connected to the intake port;
The ventilation structure of the vehicular lamp according to claim 1. The ventilation area of the portion where the other end of the communication pipe in the cylindrical member is opened is set to be smaller than the opening cross-sectional area of the upstream opening,
The ventilation structure of the vehicular lamp according to claim 1 or 2. The exhaust port or the communication pipe is provided with a filter for capturing foreign matter or a maze structure.
The ventilation structure of the vehicle lamp of any one of Claims 1-3. The downstream opening is set so as to be positioned below the upstream opening,
The ventilation structure of the vehicle lamp of any one of Claims 1-4. The exhaust port is provided at one end of the vehicle lamp in the vehicle width direction, and the intake port is provided at the other end of the vehicle lamp in the vehicle width direction.
The ventilation structure of the vehicle lamp of any one of Claims 1-5.