JP2601167Y2 - Respiration structure of vehicle lighting - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a headlamp,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breathing structure of a vehicular lamp in which fog lamps, rear combination lamps and the like communicate with each other in a lamp room, that is, inside and outside of a lamp housing, and inhale and exhaust air when air expands and contracts due to a temperature change in the lamp housing. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 3 and 4, by closing an open end of a lamp housing 2 with a lens 1, a lamp chamber 3 in the lamp housing 2 is closed and a lamp housing 2 is closed. There is a vehicular lamp T provided with breathing members 4 and 4 for communicating between the inside of the lamp chamber 3 and the outside, which is located on the outside side of the vehicle.

Each breathing member 4 is bent in a U-shape from an elastic cylinder made of rubber, resin, or the like, and has one end fitted on the outer periphery of a guide cylinder 2b projecting from the back surface 2a of the lamp housing 2. Wearing is fixed. In addition, a breathing passage 5 that allows the inside and the outside of the lamp housing 2 to communicate with each other is formed across the guide cylinder 2 b and the breathing member 4.

[0004] A temperature difference between the air in the lamp chamber 3 and the outside air occurs due to a temperature change in the lamp chamber 3 caused by turning on and off a bulb (not shown) provided in the lamp chamber 3. When it occurs,
Due to the pressure difference between the inside and outside of the lamp room 3 due to this temperature difference, the respiration of the lamp room 3 is performed through the breathing passage 5, and the temperature of the air (air) in the lamp room 3, the outside air temperature and Is reduced, and the effect of preventing water droplets from adhering to the inner surface of the lens 1 is obtained.

In the drawing, reference numeral 6 denotes a valve cap, 7 denotes an optical axis adjusting device for adjusting the optical axis of the reflector 8 in the vertical direction of the vehicle body, and 9 denotes an optical axis for adjusting the optical axis of the reflector 8 in the horizontal direction of the vehicle body. The adjusting device 10 is a hot-melt material provided at the joint between the lens 1 and the lamp housing 2 to ensure the jointability and airtightness between the lens 1 and the lamp housing 2.

On the back surface 2 a of the lamp housing 2, an upper impermeable wall 11 for projecting water flowing down from above the breathing member 4 provided with the breathing passage 5 downward from the side of the breathing passage 5 is provided. Have been. The upper impermeable wall 11 is composed of an upper inclined guide wall 11a that is gently inclined left and right, and side inclined guide walls 11b that extend from both left and right ends of the upper inclined guide wall 11a and diagonally downward sharply.

In this configuration, for example, even when raindrops flow from above the lamp housing 2 to the breathing member 4 during rainy weather traveling, the raindrops are guided by the upper water-impervious wall 11 and are directed to the side of the intake / exhaust port 5a. , And the raindrops that flow down are not sucked into the lamp chamber 3 by the respiration of the lamp chamber 3.

[0008]

However, if the water splashed by the wheels or the like during traveling adheres to the vicinity of the intake / exhaust port 5a of the breathing member 4, the adhered water will act as a respirator for the lamp chamber 3. Therefore, there is a possibility that it may be sucked into the lamp room 3, which is not preferable.

In order to solve this problem, as shown by a two-dot chain line, a mountain-shaped lower water-impervious wall 13 for preventing water splashed from below by a wheel from scattering toward the breathing passage 5 is shown in FIG. It is conceivable to protrude the rear surface 2a of the lamp housing 2 close to the intake / exhaust port 5a.

However, in this case, water flowing around the upper inclined guide wall 11a of the upper impermeable wall 11 due to surface tension as shown by the arrow 12 in FIG. 4 flows between the center of the lower impermeable wall 13 and the back surface 2a. When the pool of water accumulates in the corner and the pool of water increases, the water is regenerated by the light chamber
It is not preferable because it may be inhaled.

In view of the above, according to the present invention , the water flowing around the upper inclined guide wall of the upper impermeable wall due to surface tension and flowing toward the intake / exhaust port is collected at the corner between the center of the lower impermeable wall and the rear surface of the lamp housing. It is an object of the present invention to provide a breathing structure of a vehicular lamp capable of preventing the occurrence of a vehicle.

[0012]

In order to achieve this object, the present invention provides a lamp housing in which a bulb is housed .
A lamp having an intake / exhaust port facing at a distance on the back surface and the lamp
The interior of the housing and the atmosphere are communicated with the atmosphere via the intake and exhaust ports.
A respiratory passage, an upper water-impervious wall protruding from the rear surface, and allowing water flowing down from above the respiratory passage to flow downward from the side of the intake / exhaust port of the respiratory passage; and
Protruding from a position below the intake / exhaust port on the back side in close proximity
And a mountain-shaped lower water-impervious wall for preventing water splashed from below from scattering toward the breathing passage , wherein the upper water-impervious wall is located above the breathing passage and extends left and right.
And a wall extending downward from both sides of the wall and
In a breathing structure of a vehicle lighting device having walls respectively located on both sides of an intake / exhaust port of a road, in a breathing structure of a vehicle lighting device, the above- mentioned upper and lower impermeable walls are provided with: a pair of left and right tilt <br/> swash water guide portion extending downward in a truncated reverse V shape to both end portions of the lower water-impervious wall is integrally projects on the back, the intake and exhaust
The mouth has a breathing structure of a vehicular lamp disposed at the center between the left and right inclined water guides .

[0013]

According to this configuration, when the vehicle travels in rainy weather, the water flowing down from the upper portion of the lamp housing to the upper impermeable wall wraps around the upper inclined guide wall due to surface tension, and the water flows into the intake / exhaust port side. Even if the water flows, the water is guided to both sides of the lower impermeable wall by the inclined water guide extending in an eight-shape, and then flows downward, so that the center of the lower impermeable wall and the back of the lamp housing Water is prevented from accumulating in the corners where

[0014]

FIG. 2 shows a vehicle lamp 20 such as a headlamp, a fog lamp, a rear combination lamp, and the like. The vehicular lamp 20 has a lamp housing 21 whose opening end is hermetically closed by a lens (not shown).
Inside the lamp housing 21 is a lamp room 22 (see FIG. 1).
Is formed, and a bulb B is accommodated in the lamp chamber 22.

On the back surface 21a of the lamp housing 21,
As shown in FIG. 1, a guide cylinder 23 formed integrally with the lamp housing 21 and communicating with the lamp chamber 22 is provided in a protruding manner. One end of a breathing cylinder (breathing member) 24 formed in a tubular shape from an elastic material such as rubber or resin and bent in a substantially U-shape is fitted and fixed to the guide tubular portion 23. . In addition, a breathing passage 25 that connects the inside and the outside of the lamp housing 21 is formed across the guide cylinder 23 and the breathing member 24.

Also, the rear surface 21a of the lamp housing 21
Water flowing down from above the breathing member 24 is
An upper impermeable wall 26 protruding downward from the side of the intake / exhaust port 25a of No. 5 protrudes. The upper water impervious wall 26 is an upper inclined guide wall 26a that is gently inclined left and right and extends left and right.
From the left and right ends of the upper inclined guide wall 26a with a steep inclination.
It is composed of a side inclined guide wall 26b extending in the direction .
In addition, the intake / exhaust port 25a faces the rear surface 21a of the lamp housing 21 with an interval as is apparent from FIG.

Further, the rear surface 21a of the lamp housing 21
A mountain-shaped lower water-impervious wall 27 formed integrally with the lamp housing 21 and configured to prevent water splashed from below by wheels from scattering toward the breathing passage 25 near the intake / exhaust port 25a. It is protruding . Also ramp-how
On the back surface 21a of the jing 21, both sides of the intake / exhaust port 25a are provided.
And left and right side inclined guide walls 26a, 26 of the upper impermeable wall 26
The inclined water guides 28, 28 extending in a figure-eight shape from between the upper and lower ends of the lower impermeable wall 27 are provided. Each of the inclined water guides 28 includes a plurality of parallel inclined water guide walls 28a.
(Inclined ribs).

Some of the plurality of inclined water guide walls 28a intersect with the lower impermeable wall 27 to reinforce both ends of the lower impermeable wall 27, and both ends of the upper impermeable wall 26. It extends up to the end of the upper impermeable wall 26.

It is to be noted that an inclined guide wall 28a is provided near the innermost inclined guide walls 28a, 28a of the inclined water guide portions 28, 28 as shown by a two-dot chain line. You may comprise so that an upper end may be located in the lower part of both sides of the guide cylinder part 23. In this case, the upper impermeable wall 26
Can be more reliably prevented from flowing to the lower impermeable wall 27 side. Further, the inclination angle of the inclined guide wall 28a indicated by the two-dot chain line may be further increased so that the upper end of the inclined guide wall 28a enters below the guide cylinder 23.

Next, the breathing structure of the vehicle lamp having such a configuration will be described.

In such a configuration, a difference in temperature between the air in the lamp chamber 22 and the outside air occurs due to a temperature change in the lamp chamber 22 caused by turning on and off the bulb B provided in the lamp chamber 22. When this occurs, the pressure difference between the inside and outside of the lamp chamber 22 due to this temperature difference causes the breathing action of the lamp chamber 22 via the breathing passage 25,
Due to this respiratory action, the difference between the temperature of the air (air) in the lamp chamber 22 and the outside air temperature is reduced, and an effect of preventing water droplets from adhering to the inner surface of the lens is obtained.

Also, for example, even when raindrops flow down from above the lamp housing 21 to the breathing member 24 during running on rainy weather, the raindrops are guided by the upper water-impervious wall 26, and from below the side of the suction / exhaust port 25a. Therefore, the raindrops flowing down will not be sucked into the lamp chamber 22 by the respiration of the lamp chamber 22.

At this time, water flowing down from the upper part of the lamp housing 21 to the upper impermeable wall 26 wraps around the upper inclined guide wall 26a due to the surface tension, and flows into the intake / exhaust port 2.
Even when the water flows to the 5a side, the water is guided to both end sides of the lower impermeable wall 27a by the inclined water guide wall 28a extending in an eight-shape, and is caused to flow downward, so that the center of the lower impermeable wall 27 is formed. Water is prevented from accumulating at the corner between the lamp housing 21 and the rear surface 21a.

[0024]

[Effect] The present invention is, As described above, figure-eight shape downwardly from between the right and left walls of the both sides in the vicinity of the suction-exhaust opening upper water shield wall to both end portions of the lower water shield wall Extending left and right pair
Inclined water guiding portion is projected integrally with the rear surface of the intake
Since the exhaust port is arranged at the center between the left and right inclined water guides , the upper part of the upper impermeable wall is formed by surface tension.
Around the wall extending to the left and right of the
Along the pair of left and right inclined water guides, both ends of the lower impermeable wall
Water guided to both ends of this lower impermeable wall
Is lower than both ends of the lower impermeable wall due to the inclination of the lower impermeable wall.
And flow around the first wall.
Therefore, it is possible to prevent water flowing toward the intake / exhaust port from collecting in the corner between the center of the lower impermeable wall and the back of the lamp housing.

[Brief description of the drawings]

1A is an explanatory view of a main part showing a breathing structure of a vehicular lamp of the present invention, and FIG. 1B is a cross-sectional view taken along line AA of FIG.

FIG. 2 is a rear view of the vehicular lamp having the breathing structure of FIG.

FIG. 3 is a rear view of a conventional vehicular lamp having a breathing structure.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 Reference Signs List 20 vehicle lamp 21 lamp housing 21a rear surface 25 breathing passage 25a intake / exhaust port 26 upper water barrier 27 lower water barrier 28a inclined water guide wall

Claims (1)

(57) [Scope of request for utility model registration] 1. A lamp housing in which a bulb is housed .
A lamp having an intake / exhaust port facing at a distance on the back surface and the lamp
The interior of the housing and the atmosphere are communicated with the atmosphere via the intake and exhaust ports.
A respiratory passage, an upper water-impervious wall protruding from the rear surface, and allowing water flowing down from above the respiratory passage to flow downward from the side of the intake / exhaust port of the respiratory passage; and
Protruding from a position below the intake / exhaust port on the back side in close proximity
And a mountain-shaped lower water-impervious wall for preventing water splashed from below from scattering toward the breathing passage , wherein the upper water-impervious wall is located above the breathing passage and
And a wall extending downward from both sides of the wall,
Has walls on both sides of the intake and exhaust ports of the breathing passage
In the breathing structure of a vehicle lamp, the vicinity of both sides of the intake and exhaust ports and the left and right walls of the upper impermeable wall
Downward truncated reverse V shape from between the to ends of the lower water shield wall
A pair of left and right inclined water guides extending to the rear is integrally protruded from the rear surface, and the suction / exhaust port is provided between the left and right inclined water guides.
A breathing structure for a vehicular lamp, which is disposed at the center .