JPS6242410Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a waterproof structure for an automobile lamp. FIG. 1 is a horizontal sectional view of an example of a commonly used automotive lamp, and FIG. 2 is a vertical sectional view thereof.

1 is a light bulb, 2 is a reflector, and 3 is a lamp housing. In order to waterproof the rear end portion of the lamp housing 3, a cylindrical portion 3a is integrally connected to the rear end of the rear portion 3c of the lamp housing, and a flange-like projection 3b is integrally formed on the rear end. On the other hand, a waterproof cover 4 is constituted by integrally molding a cylindrical portion 4a that fits onto the cylindrical portion 3a described above from a flexible material such as rubber. A stepped portion 4b that engages with the protrusion 3b is formed to prevent the waterproof cover 4 from coming off. The hole 4d shown in FIG. 2 is a ventilation hole for both ventilation and water drainage. These vent holes and drain holes function to release moisture condensed within the lamp housing to the outside due to temperature changes.

In this conventional waterproof structure, a lip 4c that expands like a flap is integrally molded at the tip of a cylindrical portion 4a of a waterproof cover 4 made of an elastic material such as rubber.
The tip of c is elastically brought into close contact with the rear part 3c of the lamp housing 3 to achieve a waterproof function.

However, recently, in order to reduce the air resistance of automobiles, the front of the vehicle body has become lower, and accordingly, the holes for mounting the lamps have become smaller and the lamps have also become flatter. For this reason, it has become increasingly difficult to attach and detach the waterproof cover to the lamp housing.

In view of the above-mentioned circumstances, the present invention aims to provide a waterproof structure for automotive lighting that is easy to install and remove even if the lighting installation hole on the vehicle body side is small, has excellent waterproof function, and is simple and inexpensive. It is something.

In order to achieve the above object, the waterproof structure of the present invention includes a cylindrical part integrally connected to the rear end of the lamp housing, and two outer flange-shaped parts at the front and rear ends of the cylindrical part. The projection is formed so that its opposing rear and front surfaces have a certain width dimension W, and at least one
a plurality of intermediate outer flange-like protrusions are formed, and the outer circumferential surface of the cylindrical portion is configured in a stepped shape such that the diameter becomes smaller on the rear side with the intermediate outer flange-like protrusions as a boundary; a waterproof cover having a cylindrical portion that fits over the cylindrical portion of the housing;
and forming an inner flange-like protrusion on the inner surface of the cylindrical part of the waterproof cover to engage with the outer flange-like protrusion on the rear end side and the intermediate outer flange-like protrusion formed on the cylindrical part of the lamp housing, Dimension between the rear surface of the inner flange-like projection that engages with the outer flange-like projection on the rear end side and the front end surface of the cylindrical part
W' is made slightly larger than the width W between the outer flange-like protrusions of the lamp housing, and the inner flange-like protrusion of the waterproof cover is fitted into the outer flange-like protrusion of the lamp housing. Between the opposing rear and front surfaces of the outer flange-like projections formed at the front and rear ends, the front end surface of the cylindrical portion of the waterproof cover and the rear surface of the inner flange-like projections are connected by the above-mentioned W′>W. It is characterized by being held in a compressed state.

Next, an embodiment of the present invention will be described with reference to FIGS. 3 to 7.

The lamp housing 5 shown in FIG. 3 is an example of a lamp housing constructed by applying the present invention, and has a cylindrical portion 5b integrally formed in the rear portion 5a, and three outer flange-like projections 5c, 5d. , 5e are provided. Of these three outer flange-like projections, the rearmost projection 5c is a component corresponding to the flange-like projection 3b in the conventional device (FIGS. 1 and 2).
The inner flange is integrally connected to the outer flange. The outer flange-like protrusions 5d and 5e are newly installed components by applying the present invention, and the illustrated W indicates the opposing front and rear surfaces of the outer flange-like protrusion 5c at the rear end and the flange-like protrusion 5e at the front end. This is the width dimension between.

The diameter of the outer periphery of the cylindrical portion 5b is configured in a stepped manner, with the rear diameter _D1 being smaller than the front diameter _D2 , with the intermediate outer flange-like projection 5d as a boundary.

When implementing the present invention, the number of the outer flange-like protrusions to be installed is 3 or an arbitrary number N of 3 or more.
(However, N can be an integer). In this case, the number of intermediate outer flange-like protrusions located between the outer flange-like protrusions at the front end and the flange-like protrusions at the rear end is N-2, so the outer periphery of the cylindrical portion is N-2.
It is formed into a stepped cylindrical surface of N-2 steps with two outer flange-like protrusions as boundaries.

FIG. 4 shows an example of a waterproof cover constructed by applying the present invention. The waterproof cover 6 of this embodiment is made of rubber and has a cylindrical portion 6a that fits over the lamp housing cylindrical portion 5b.

N-1 inner flange-like projections are formed on the cylindrical portion 6a, corresponding to the number N of outer flange-like projections provided on the lamp housing cylindrical portion. In this example, since the number of outer flange-like projections installed is N=3, N-1=2 inner flange-like projections are provided. 6b and 6c are two inner flange-like projections set as described above.

The diameters D ₁ ′ and D ₂ ′ of the tops of the two inner flange-like projections 6b and 6c are determined as appropriate depending on the diameters D ₁ and D ₂ of the stepped portion of the lamp housing cylindrical portion 5b, respectively. Set to have a tightening allowance. Since D ₁ <D ₂ as described above, D ₁ ′<D ₂ ′ accordingly.

W′ in Fig. 4 is the inner flange-like projection 6b on the rear side.
This is the dimension from the rear surface to the front end surface 6a-1 of the cylindrical portion. The value of W' is set so as to have an appropriate interference compared to the dimension W explained with reference to FIG. 6d is a ventilation/drainage hole.

FIG. 5 is a vertical sectional view of the lamp housing 5 with the waterproof cover 6 fitted. FIG. 6 shows the state in the middle of the fitting operation. It is generally very difficult to externally fit a flexible cylindrical member having multi-stage inner flange-like protrusions onto a cylindrical member having multi-stage outer flange-like protrusions. However, in the present invention, as previously explained with reference to FIG. 4, the diameter D 2 of the inner periphery of the inner flange-like projection 6c on the front side is smaller than the diameter D ₁ ' of the inner periphery of the inner flange-like projection 6b on the rear side _. ' is configured to have a large diameter, so that the inner flange-like projection 6c, which has a large inner circumferential diameter, easily climbs over the outer flange-like projection 5 to reach the state shown in the figure. After doing this, when the inner flange-like protrusion 6b with the smaller inner diameter is placed against the outer flange-like protrusion 5c and is made to ride over the outer flange-like protrusion 5c, the inner flange-like protrusion 6c with the larger inner circumference diameter is almost the same as the outer flange-like protrusion 5d. Easily overcome without interference. When the waterproof cover 6 is fitted in this manner, the state shown in FIG. 5 is achieved, and the side surfaces of the outer flange-like projection and the inner flange-like projection are in close contact with each other.

Dimensions shown in Figure 4 for dimension W shown in Figure 3
Since W' is slightly larger, the cylindrical portion 6a of the waterproof cover 6 is slightly compressed in the axial direction in the state shown in FIG. For this reason, since the front end surface 6a-1 of the cylindrical portion of the waterproof cover and the rear surface of the inner flange-like projection 6b are compressed between the outer flange-like projections 5c and 5e, this portion The most effective sealing function is performed.

In this embodiment, the case where the number N of outer flange-like protrusions on the lamp housing side is 3 has been described, but even when N is 4 or more, the cylindrical part of the lamp housing is stepped in the rear side. By making the inner peripheral surface of the inner flange-like protrusion of the cylindrical part of the waterproof cover smaller in diameter in a stepwise manner on the rear side, the inner circumferential surface of the inner flange-like protrusion of the cylindrical part of the waterproof cover is made smaller in diameter. Multi-stage flange parts can be fitted together. If the number N is changed as described above, the watertightness will be further improved.

7 shown in FIG. 5 is a part of the vehicle body, and 7a is a hole for attaching a lamp. If the mounting hole 7a is small as in this example, it is not possible to mount a waterproof cover having a flap-like lip 4c as in a conventional waterproof structure. If the cylindrical portion 5b is made to protrude from the mounting hole 7a, the cylindrical portion 6a of the waterproof cover 6 can be fitted into the cylindrical portion 5b to achieve the waterproof function, and the waterproof cover 6 can be quickly attached. , can be easily attached and detached. Furthermore, since there is no need to form the flap-like lip 4c on the waterproof cover, the manufacturing cost of the waterproof cover can be reduced.

As detailed above, the waterproof structure of the automotive lamp of the present invention has a simple and inexpensive structure that provides excellent waterproof function, and can be easily installed and removed even if the installation hole of the lamp is small. .

[Brief explanation of the drawing]

1 and 2 show the waterproof structure of a conventional automobile lamp, with FIG. 1 being a horizontal sectional view and FIG. 2 being a vertical sectional view. 3 to 6 show an embodiment of the present invention, in which FIG. 3 is a vertical sectional view of the lamp housing, FIG. 4 is a sectional view of the waterproof cover, FIG. 5 is a vertical sectional view of the assembled state, and FIG. FIG. 6 is an explanatory diagram of the assembly work. DESCRIPTION OF SYMBOLS 1... Light bulb, 2... Reflector, 3... Lamp housing, 4... Waterproof cover, 5... Lamp housing, 5a... Same conical part, 5b... Same cylindrical part, 5c, 5d, 5e... ... Same outer flange-like projection, 6... Waterproof cover, 6a... Same cylindrical part, 6
b, 6c...inner flange-like projections, 4d, 6d...
...Vent hole and water drain hole, 7...Vehicle body, 7a...Light fitting hole.

Claims (1)

[Scope of utility model registration request] In an automobile lamp having a lamp housing, a cylindrical part is integrally connected to the rear end of the lamp housing, and two outer flange-like protrusions are provided on the front side and the rear end of the cylindrical part to face each other. The side surface and the front surface are formed to have a certain width dimension W, and at least one
a plurality of intermediate outer flange-like protrusions are formed, and the outer circumferential surface of the cylindrical portion is configured in a stepped shape such that the diameter becomes smaller on the rear side with the intermediate outer flange-like protrusions as a boundary; a waterproof cover having a cylindrical portion that fits over the cylindrical portion of the housing;
and forming an inner flange-like protrusion on the inner surface of the cylindrical part of the waterproof cover to engage with the outer flange-like protrusion on the rear end side and the intermediate outer flange-like protrusion formed on the cylindrical part of the lamp housing, Dimension between the rear surface of the inner flange-like projection that engages with the outer flange-like projection on the rear end side and the front end surface of the cylindrical part
W' is made slightly larger than the width W between the outer flange-like protrusions of the lamp housing, and the inner flange-like protrusion of the waterproof cover is fitted into the outer flange-like protrusion of the lamp housing. Between the opposing rear and front surfaces of the outer flange-like projections formed at the front and rear ends, the front end surface of the cylindrical portion of the waterproof cover and the rear surface of the inner flange-like projections are connected by the above-mentioned W′>W. A waterproof structure for an automobile lamp characterized by being clamped in a compressed state.