JPH07262809A - Water-proof structure of lighting fixture for vehicle - Google Patents

Abstract

PURPOSE:To prevent water drops flowing reversely from being sucked to a light chamber from a breathing member by providing a space to let flow a fluid between the lower end of the breathing member with a nearly U-shaped cross section communicating to the light chamber, and the hood at the bottom of a fitting member. CONSTITUTION:The front side opening of a housing 14 is closed by a lens 16, a bulb 18 is installed in a formed light chamber 17, and the light chamber 17 is installed in a car body 12 with a fitting member 13. Furthermore, the upper end 20b of a breathing member 20 with a nearly U-shaped cross section is fixed to the rear wall 14c of the housing 14, and it is communicated to the light chamber 17 through a breathing hole 14e engraved to the rear wall 14c, while its lower end 20a is opened opposing to the rear surface of the rear wall 14c providing a specific interval. In such a lighting fixture 10 for vehicle, a hood 13d at the lower part of the fitting member 13 is provided at the lower side of the light chamber 20 and projecting rearward from the rear wall 14c, and a space 21 is provided between the hood 13d and the lower end 20a of the breathing member 20, so as to make possible to let flow a fluid along the front side and the rear side of the lower end 20a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a vehicular lamp in which a breathing member having a substantially U-shaped cross section is used to communicate with the outside of the lamp chamber to prevent water droplets from being generated in the lamp chamber. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 4A and 4B, a vehicular lamp body 1 is mounted on a vehicle body 3 via mounting members 2 and 2.
It is known to be attached to.

In the vehicle lamp body 1, a lamp chamber 6 is formed by closing a front opening 4a of a housing 4 with a lens 5, and a lower end 7a opposed to a rear wall 4b of the housing 4 at a predetermined interval. An upper end 7b of a breathing member 7 having a substantially U-shaped cross section is held by a cylindrical portion 4c integral with the housing 4, and a breathing hole 4d that connects the lamp chamber 6 and the breathing member 7 is bored in the rear wall 4b. A roof portion 4e projecting rearward from a rear wall 4b is integrally formed so as to surround left and right sides from above the member 7, and an eaves portion 4f projecting rearward from the rear wall 4b is formed below the breathing member 7. It is formed integrally with 4.

The eaves portion 4f serves as a guide plate for avoiding the water droplets attached to the rear wall 4b and the outer surface of the breathing member 7 from being absorbed by the breathing member 7 from the lower end 7a. .

[0005]

By the way, in the waterproof structure of the vehicular lamp constructed as described above, for example,
In the process of water droplets adhering to the upper surface of the eaves portion 4f being guided to the edge of the eaves portion 4f, when a wind is generated from the rear wall 4b toward the lens 5 side, this wind causes the air flow as indicated by the arrow a. ,
There is a risk that water droplets may be reflected by the rear wall 4b and sucked in from the lower end 7a.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a waterproof structure for a vehicle lamp which can prevent the breathing member from being sucked into the breathing member even when water flows backward. It is what

[0007]

SUMMARY OF THE INVENTION In order to achieve the object of the present invention, a lamp chamber is formed by closing a front opening of a housing with a lens, and a predetermined distance is provided on a rear wall of the housing. An upper end of a breathing member having a substantially U-shaped cross section having opposite lower ends is held by the housing, and a breathing hole that connects the lamp chamber and the breathing member is formed in a rear wall of the housing. In a waterproof structure for a vehicular lamp, in which an eave portion protruding rearward from a rear wall of the housing is provided, a lower end of the breathing member of the rear wall is opposed to the eave portion and the breathing member. The gist of the present invention is to provide a space in which the fluid flows across the front and back of the portion to be filled.

[0008]

In such a structure, the lamp chamber is formed by closing the front opening of the housing with the lens, and the lower end of the breathing member having a substantially U-shaped cross section whose upper end is held by the housing is the rear wall of the housing. And a breathing hole for communicating the lamp chamber and the breathing member are formed in the rear wall of the housing, and an eave portion protruding rearward from the rear wall of the housing is provided below the breathing member. A space in which the fluid circulates across the front and rear of the portion of the rear wall facing the breathing member is provided between the eaves and the breathing member.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a waterproof structure for a vehicle lamp according to the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 (A) is a longitudinal sectional view of a main part of a vehicle lamp of the present invention, and FIG. 1 (B) is a rear view of the main part of the vehicle lamp of the present invention.

In FIG. 1, a vehicular lamp 10 comprises a lamp body 11 and a mounting member 13 for fixing the lamp body 11 to a vehicle body 12.

The lamp body 11 closes the front opening 14a through a housing 14 having a front opening 14a and a sealing material 15 filled in an annular groove 14b formed at the opening edge of the housing 14. As housing 14
The lens 16 held by the lens 16, the lamp chamber 17 formed by being closed by the lens 16, the bulb 18 positioned inside the lamp chamber 17, and the lamp 14 positioned behind the bulb 18 and held by the housing 14. The reflector 19 and the breathing member 20 mounted on the rear wall 14c of the housing 14 are provided.

On the rear wall 14c of the housing 14, the lower end 20a of the breathing member 20 is engaged with the upper end 20b of the breathing member 20 while facing the rear wall 14c at a predetermined interval.
Is integrally formed with a cylindrical portion 14d. Further, the rear wall 14c is provided with a breathing hole 14e that connects the lamp chamber 17 and the breathing member 20. Furthermore, the rear wall 14c
The roof portion 14f is integrally formed with the roof member 14 so as to surround the left and right sides of the breathing member 20 and project rearward.

On the other hand, the mounting member 13 has two inner and outer layers of an inner cylinder member 13a and an outer cylinder member 1 which are opposed to each other so as to have a predetermined space.
3b and.

A drainage hole 13c is formed in the lower wall portion of the inner cylindrical member 13a located on the rear wall 14c side of the annular groove portion 14b.

An eave portion 13d is integrally formed with the outer cylinder member 13b. The eave portion 13d forms a space portion 21 that is located between the breathing member 20 and extends in the front-rear direction with respect to a portion facing the lower end 20a of the rear wall 14c. Further, the inner cylinder member 13a and the outer cylinder member 13b form a crank-shaped communication portion 22 that communicates the space on the front side with the space portion 21. In addition, a part of the space portion 21 and the communication portion 22 are formed over the entire left and right width of the lamp body 11.

In the above structure, the water droplets attached to the rear wall 14c of the housing 14, especially the vicinity including the roof portion 14f, flow downward and drop onto the upper surface 13e of the eave portion 13d.

The water droplets dropped on the upper surface 13e are emptied from the communicating portion 22 when, for example, the vehicle body is traveling forward, or when the wind is blowing from the front to the rear of the vehicle body. Air guided to the part 21 (arrow B direction)
Is guided to the tip of the eaves portion 13d and falls downward (in the direction of arrow C).

Further, for example, when the vehicle body is traveling backward, or when the wind is blowing from the rear side to the front side of the vehicle body, the air guided from the space portion 21 to the communication portion 22 ( When it is guided to the communicating portion 22 by the direction of arrow D), it falls (in the direction of arrow E).

At this time, the water droplets that have jumped from the upper surface 13e of the eaves portion 13d over the communication portion 22 and are guided between the housing 14 and the inner cylindrical member 13a fall through the water drain hole 13c.

Further, the air (in the direction of arrow B) guided from the communication portion 22 to the space portion 21 passes outside the housing 14, so that the temperature difference between the air in the lamp chamber 17 and the outside air is quickly balanced. It also plays the role of controlling. At this time, even if water droplets enter the communication portion 22 from the outside, since the communication portion 22 has a crank shape, the water droplets are not guided to the breathing member 20.

Further, since the eaves portion 13d is formed integrally with the outer tubular member 13b, the height of the lamp main body 11 and the size of the vehicle lamp 10 as a whole can be reduced.
The degree of freedom in designing the vehicular lamp 10 also increases.

As shown in FIG. 2 (A), a concave wall portion 14g is formed below the rear wall 14c of the housing 14 so as to enter the lamp chamber 17, and the space formed by the concave wall portion 14g is formed. The rear wall 1 is located between the eaves portion 13d and the breathing member 20 by facing the base end portion of the eaves portion 13d.
You may form the space part 21 'which circulates across the front and back with respect to the part which opposes the lower end 20a of 4c.

The space 21 'may be formed so as to extend in the width direction of the housing 14 as shown in FIG. 2 (B), or may be formed below the breathing member 20 as shown in FIG. You may form only in the part located. In addition, in FIGS. 2 and 3, the same components as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

[0025]

As described above, in the waterproof structure for a vehicular lamp of the present invention, between the eaves portion and the breathing member, a portion of the rear wall facing the lower end of the breathing member is provided. Since the space in which the fluid flows is provided across the front and rear, it is possible to prevent suction of the water droplets into the breathing member even when the water flows backward.

[Brief description of drawings]

FIG. 1 shows a first embodiment of a waterproof structure for a vehicle lamp of the present invention, (A) is a sectional view of the vehicle lamp, and (B) is a plan view of the vehicle lamp.

2A and 2B show a second embodiment of the waterproof structure for a vehicle lamp of the present invention, FIG. 2A is a sectional view of the vehicle lamp, and FIG. 2B is a plan view of the vehicle lamp.

FIG. 3 is a plan view of a vehicle lamp showing a modification of the second embodiment of the waterproof structure for a vehicle lamp of the present invention.

FIG. 4 shows a conventional waterproof structure for a vehicle lamp, (A) is a cross-sectional view of the vehicle lamp, and (B) is a plan view of the vehicle lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Vehicle lamp 11 ... Lamp main body 13 ... Mounting member 13d ... Eaves part 14 ... Housing 14a ... Front opening 14c ... Rear wall 14e ... Breathing hole 16 ... Lens 17 ... Lamp room 20 ... Breathing member 20a ... Lower end 21 ... Space part

Claims (1)

[Claims] 1. An upper end of a breathing member having a substantially U-shaped cross section, wherein a lamp chamber is formed by closing a front opening of a housing with a lens, and a rear wall of the housing has lower ends facing each other at a predetermined interval. Is held in the housing, a breathing hole that communicates the lamp chamber and the breathing member is formed in the rear wall of the housing, and an eave portion that projects rearward of the rear wall of the housing is provided below the breathing member. In a waterproof structure for a vehicle lamp provided, a space between the eaves and the breathing member, in which a fluid flows forward and backward with respect to a portion of the rear wall facing the lower end of the breathing member. A waterproof structure for a vehicular lamp, wherein: