JP2538697Y2 - Respiration structure of vehicle lighting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a breathing structure of a vehicle lamp.

[Conventional technology]

The breathing structure of vehicular lighting is provided mainly to prevent i. Damage due to internal pressure rise and ii. To prevent lens fogging due to changes in temperature and humidity.

Among the above, the prevention of breakage of item i is based on the fact that if the lamp housing and the front lens have a completely sealed structure, the air is thermally expanded due to the rise in temperature due to the lighting of the light source bulb, and any of the structural parts (the weakest part) ) Is intended to prevent damage, and the breathing structure provided for this purpose only needs to communicate between the inside and outside of the lamp housing. A device must be designed so that it does not enter the lamp housing through the breathing hole. Further, the breathing hole for preventing fogging of the lens of the item ii,
It is desirable to use a large-diameter hole in order to make the exchange (breathing) between the air and the air in the lamp chamber vibrant, but if a large-diameter breathing hole is provided, dust in the atmosphere can be sucked into the lamp chamber. , Rainwater and car wash water can easily enter the lamp room,
The diameter of the breathing hole is naturally limited.

FIG. 2A is a cross-sectional view of a vehicular lamp provided with a conventional breathing structure. The view on arrow B is shown in FIG.

A lens 2 is fixed to cover a front opening of a synthetic resin lamp housing 1.

In this conventional example, a lens leg 2a integrally formed around the lens 2 is inserted into a melt groove 1a integrally formed around the opening of the lamp housing 1, and a heat-softening adhesive (hot melt) is used. It is airtightly bonded. In this way, a lamp room A partitioned from the atmosphere is formed.

A breathing hole 4 is provided to allow the light room A to communicate with the atmosphere, and a grommet 5 is attached so that rainwater, car wash water, and water splashed during running do not enter through the breathing hole.

The grommet 5 has a substantially U-shaped hollow shape.
One end opening (upper end opening) of the grommet 5 is externally fitted to a breathing tube 1e (the breathing hole 4 is provided in the breathing tube 1e) which is integrally provided on the rear surface 1b of the lamp housing 1. Thus, the outside and the inside of the lamp room A are communicated through the grommet 5 and the breathing hole 4. The other end opening (lower end opening) of the grommet 5 is located below and faces the rear surface 1b of the lamp housing 1.

Reference numeral 3 denotes a reflector mounted in the lamp room A so as to be tiltable up, down, left and right. 3a is an adjusting screw for tilting the reflector 3 up and down (or left and right).

[Problems to be solved by the invention]

As described above, in the vehicular lamp formed by sealing the front opening of the lamp housing 1 with the lens 2, the change in the air pressure in the lamp chamber due to the temperature change is released, and the change is balanced with the atmosphere to prevent damage to the constituent members. Considering only that, the breathing hole 4 may be a pinhole. However, in order to reduce the occurrence of fogging of the lens 2 or to quickly eliminate the generated fogging, a corresponding opening area is required.

However, when the diameter of the breathing hole 4 is increased, there is a possibility that rainwater in rainy weather, washing water for car washing, or road water splashed up during traveling may enter the lamp room from the breathing hole.

In the conventional example shown in FIG. 2, a U-shaped grommet 5 is attached to the breathing hole 4 and a waterproof eave 6 is provided to cover the grommet 5 in an eave-like shape. Although the plate 7 is provided, it is not possible to completely prevent water from entering the lamp room A by this alone.

In particular, water adhering to the rear surface 1b of the lamp housing 1 does not necessarily flow down linearly and vertically. That is, the rear surface 1b of the lamp housing 1 may move so as to crawl obliquely and in a curved manner under the influence of the unevenness of the rear surface 1b and the surface tension of water. When this water moves so as to crawl obliquely and in a curve and gathers at the breathing part, particularly at the lower end opening of the grommet 5, this water is sucked into the lamp chamber A by the respiration of the lamp chamber A and enters the lamp chamber A. There are cases.

The present invention has been made in view of the above-described circumstances, and has a high reliability in preventing moisture from entering the lamp room without reducing the diameter of the breathing hole 4 or changing the shape and size of the grommet. It is an object of the present invention to provide a breathing structure of a vehicular lamp improved so as to be able to prevent the above problem.

[Means for solving the problem]

According to the present invention, in order to achieve the above object, a plurality of ridges or grooves in a substantially vertical direction are located on the left and right sides of the grommet on the rear surface of the lamp housing, and the lower ends of the ridges or grooves are formed at the lower end of the grommet. It is provided so as to be located below the opening.

In the present invention, the back surface of the lamp housing refers to an outer surface of a wall on a side opposite to a light emitting direction of the vehicle lamp.

[Action]

According to the above configuration, the water adhering to the rear surface of the lamp housing is guided by the vertical ridges (or grooves) and flows downward substantially linearly, so that the water moves so as to crawl obliquely and in a curved manner. Therefore, there is no possibility of gathering at the breathing part, especially at the lower end opening of the grommet. That is, it is possible to prevent water from concentrating on the breathing unit by giving directionality to the water flowing down from above to the breathing unit, and to maintain stable waterproof performance.

Therefore, the protrusions (or grooves) according to the present invention can effectively prevent external water from entering the lamp room.

Furthermore, by using the present invention in combination with a known technique (for example, a grommet, a waterproof eave, and a water shield) for waterproofing the breathing hole, a more complete waterproofing effect can be obtained.

〔Example〕

FIG. 1 shows a vehicular lamp provided with one embodiment of a breathing structure according to the present invention.

This embodiment is a modification of the conventional example shown in FIG. 2 by applying the present invention. The same reference numerals as in FIG. 2 denote the same or similar components as those in the conventional example. is there.

The lamp housing 1 'is a similar component corresponding to the lamp housing 1 in the conventional example, and has a plurality of vertical projections on a back surface 1b thereof (an outer surface of the vehicle lighting device opposite to the light projection direction). The ridge 1c (three on each side in this example) is positioned on the left and right of the grommet 5, and the lower end of the ridge 1c is positioned below the other end opening (lower end opening) of the grommet 5. Is provided.

As a result, a groove 1d is formed between the ridges.

When the present invention is carried out, a ridge having a shape protruding from the rear surface 1b of the lamp housing 1 may be provided as in the above embodiment, or a groove formed by cutting the rear surface 1b may be provided. As a result, corrugated (or similar) irregularities in which ridges and grooves are alternately arranged are formed.

The water adhering to the back surface 1b of the lamp housing 1 is guided by the vertical ridges 1c or the grooves 1d and flows downward substantially linearly. In particular, there is no danger of gathering at the lower end opening of the grommet 5. That is, it is possible to prevent water from concentrating on the breathing unit by giving directionality to the water flowing down from above to the breathing unit, and to maintain stable waterproof performance.

[Effect of the invention]

As described above, the breathing structure of the present invention can prevent water from concentrating on the breathing unit by giving directionality to the water flowing down from above to the breathing unit, and maintain stable waterproof performance. .

[Brief description of the drawings]

FIG. 1A is a sectional view of a main part of a vehicular lamp provided with an embodiment of a breathing structure according to the present invention, and FIG. 1B is a rear view of the part. FIG. 2A is a cross-sectional view of a conventional vehicular lamp having a breathing structure, and FIG. 1,1 '…… Lamp housing, 1a …… Melt groove, 1b ……
Back, 1c ridge, 1d Groove, 2 Lens, 2a Lens leg, 3 Reflector, 4 Breathing hole, 5 Grommet, 6 Waterproof eaves, 7 Shield Water plate.

Claims (1)

(57) [Scope of request for utility model registration] 1. A method for covering a front opening of a lamp housing,
A lens is hermetically mounted, and a breathing hole is provided through the rear wall of the lamp housing. One end opening of a grommet communicates with the breathing hole in the rear wall of the lamp housing. In the breathing structure of a vehicular lamp in which the other end opening of the grommet is located below, a plurality of substantially vertical ridges or grooves are provided on the rear surface of the lamp housing, A breathing structure for a vehicular lamp, which is provided so as to be positioned on the left and right of the grommet and so that the lower end of the ridge or groove is positioned below the other end opening of the grommet.