JPS6325239Y2 - - Google Patents

Description

[Detailed Description of the Invention] The object of the present invention is to prevent noise generated at the mounting portion of a headlamp door when an automobile is running.

The headlamp door, which is installed in a frame shape around the headlamp at the front of the car, is attached to the body with screws, bolts, etc., but be careful not to expose the heads of the screws and spoil the appearance. Due to this, a cylindrical mounting hole with an opening on the door surface is made to protrude toward the back of the door on the outer periphery of the headlamp door, and the bottom of the mounting hole and the body are brought into close contact with each other, and secured with screws inserted through the opening. Generally, this method is taken.

In this case, since the mounting hole has a cylindrical shape with an opening at the front and a bottom, air flowing into the mounting hole through the opening when the vehicle is running causes an air column resonance phenomenon within the hole, thereby generating resonance noise. This resonance sound is close to a pure tone, so even if it passes into the passenger compartment, it can be distinguished from other sounds and is unpleasant to the ears. Particularly in recent years, as efforts have been made to reduce interior noise and make the interior of a vehicle quieter, the above-mentioned resonance noise has become a problem.

Therefore, the present invention prevents the occurrence of air column resonance by providing a through hole in the cylindrical side of the conventional mounting hole to communicate the inside and outside of the hole, thereby solving the above problem. It is something.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

In the embodiment shown in FIGS. 1 to 3, 1
2 is a headlamp, and 2 is a headlamp door. The corner portion of the headlamp door 2 is fixed to a body panel 3 at the front of the automobile.

A cylindrical mounting hole 5 is formed in a corner of the headlamp door 2 and protrudes toward the back surface thereof.
is opened on the headlamp door surface, and the bottom surface 5 is located at the tip.
1 is formed. On the other hand, a bracket 6 is welded to the body panel 3 at a position facing the mounting hole 5. Then, the bottom surface 51 of the mounting hole 5 is placed on top of the bracket 6, and both are fastened together with a screw 7 inserted into the mounting hole 5 through its opening. A circular through hole 52 is formed in the side wall surface of the mounting hole 5 near the bottom surface 51, so that the inside and outside of the mounting hole 5 communicate with each other.

By providing the through hole 52, air flowing into the mounting hole 5 during running immediately flows out through the through hole 52.

Figure 6 shows the mounting structure of the above embodiment of the present invention (solid line) and the conventional mounting structure without through holes (broken line).
This shows a comparison of indoor sound pressure levels between
As shown in the figure, the mounting structure of the present invention can shift the generation of the maximum resonance sound to the higher vehicle speed side, and can also lower the level of the maximum resonance sound itself, contributing to the reduction of unpleasant noise inside the vehicle.

Note that the shape of the through hole 52 is not limited to the above-mentioned embodiment, and may be square, for example, as shown in FIG. 4. Furthermore, a slit may be formed in the side wall from the opening side of the mounting hole 5 to the bottom side.

As mentioned above, the present invention has a mounting structure in which the headlamp door is fastened to the body with screws, etc. on the lower side of a closed tubular mounting hole that is open on one side. By opening the hole, the air column resonance phenomenon in the mounting hole is prevented from occurring, thereby contributing to the prevention of unpleasant noise in automobiles. In particular, the present invention has an extremely practical effect because it can prevent unpleasant noises from the headlamp door by simply providing a through hole in the conventional mounting hole without adding any other members.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, in which FIG. 1 is a plan view of a corner of a headlamp door, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. The figure is a sectional view taken along the line B--B of FIG. 2, FIGS. 4 and 5 are sectional views of other embodiments, and FIG. 6 is a sound pressure level/vehicle speed diagram. 1...Head lamp, 2...Head lamp door, 3...Body panel, 5...Mounting hole, 52
...Through hole, 7...screws.

Claims (1)

[Scope of utility model registration request] In a headlamp door installed in a frame shape around the outer circumference of an automobile headlamp, a cylindrical mounting hole with a front opening that protrudes toward the back side of the headlamp door is formed in the headlamp door, and the mounting hole is fixed to the front body of the automobile with screws, etc. at the bottom of the mounting hole. A mounting hole structure for a headlamp door, characterized in that a through hole is formed on the side of the mounting hole to communicate the inside and outside of the mounting hole.