JPH0535879Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle mirror device that is attached to a door or fender of an automobile, and in particular, the outer surface of the housing or the base portion of the housing while the vehicle is running. The present invention relates to a vehicle mirror device that aims to prevent wind noise caused by screw holes, drain holes, etc. provided in a vehicle.

[Prior Art] Conventionally, this type of mirror device has a drain hole for draining rainwater that has entered the base during rainfall, and a screw hole for attaching the mirror unit to the base or the lower part of the mirror housing. It is formed.

When the air flow generated while the vehicle is running at high speed hits such a mirror device from the front, wind noise is generated due to the air being handled at the drain hole 10, as shown in FIG. That is, when the airflow that hits the mirror device flows toward the rear of the vehicle, the hole 1
Since there is a difference in pressure between the inside and outside of 0, air is sucked out and wind noise is generated. It has been confirmed through experiments that the maximum volume of this wind noise occurs when the hole diameter is approximately 4 to 6 mm. Therefore,
Conventionally, measures have been taken to suppress the generation of wind noise, such as making the hole diameter considerably larger or smaller than the one described above, or closing the hole with a rubber plug-like member (grommet). Ta.

[Problems to be solved by the invention] However, if the diameter of the drain hole is made large, the appearance of the device will be spoiled, while if the diameter is made small, the water draining performance will deteriorate. Furthermore, the use of grommets or the like is not preferable because it increases the cost of the product.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mirror device capable of solving the above-mentioned conventional problems.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides one or more holes such as drain holes or mounting screw holes on the outer surface of the mirror housing or its base. In the mirror device for a vehicle, a recess or a protrusion for forming turbulent flow is provided near the hole and at least at a position in front of the vehicle from the hole.

[Function] When the mirror device having the above-described structure is attached to a vehicle and the vehicle is driven, the recess or protrusion acts as a baffle plate or guide member for the airflow flowing on the outer surface of the mirror housing or the base portion. As a result of the rectified airflow becoming turbulent when it hits the recess or protrusion, the pressure difference between the inside and outside of the hole becomes small.
Wind noise caused by air being sucked out can be suppressed.

[Example] Hereinafter, the present invention will be specifically explained based on the drawings.

Figures 1 to 3 show one embodiment of the present invention, with Figure 1 being a front view showing the whole, Figure 2 being a vertical sectional view of the main part of the mirror housing, and Figure 3 being a plan view of the same. This is what is shown. In other words, 1 in the figure
is a mirror housing, and a space for accommodating the mirror glass 2 is formed inside the mirror housing. At least the lower wall of the mirror housing 1 is provided with one or more drainage holes for discharging running water or tightening adjustment holes 3 for screws for attaching the mirror unit. A protrusion 4 is provided near the hole 3 and at least at a position on the front side of the vehicle than the hole, which protrudes outward from the lower surface of the hole. As shown in FIG. 2, the protrusion 4 has a bulge (thickness) that increases from the front side of the vehicle toward the rear side, and is formed like a dam with a gently streamlined sloped outer surface. The weir-like protrusion 4 is formed in a half-moon shape on the front side of the outer periphery of the hole 3 when viewed from the front.
(see figure).

According to the mirror device of the present invention configured as described above, the rectified airflow flowing on the outer surface of the protrusion 4 as shown by the dotted line in FIG. It becomes turbulent and flows away towards the rear of the vehicle. Therefore, there is no difference in air pressure between the inside and outside of the hole 3, and wind noise due to air being sucked out can be prevented.

By the way, the shape of the protruding part is not limited to the weir-like shape as shown in FIGS. 2 and 3, but the protruding part can be formed in the front position of the hole by counterboring the circumference of the hole 3 as shown in FIG. 5 may be formed. Incidentally, FIG. 4 shows an example in which the structure of the present invention is applied to the base portion 8. In this case, it is preferable that the lower surface of the base is a curved surface 6 that projects outward.

In the example shown in FIG. 5, a bent portion 7 projecting outward is formed on the lower surface of the base, and a hole 3 is provided at a position on the rear side of the vehicle than the bent portion.
Incidentally, even in this case, the protrusion 5 may be formed by counterboring the circumference of the hole 3.

Figure 6 shows a recess 9 for forming turbulent flow around the hole 3.
This figure shows an example in which . As shown in FIG. 7, the recess 9 is formed at least toward the front of the vehicle than the hole 3, but it may be formed all around the recess. Note that the groove width of the recess in the example is 2 to 5.
It is formed into an arch-shaped groove having dimensions of about 1 to 5 mm and a depth of about 1 to 5 mm. Instead of a groove like this, a diameter of 10
An opening having a diameter of mm or more may be formed in front of the hole 3. As described above, the recess as used in the present invention includes the groove and the opening.

[Effects of the invention] As described above, the present invention is provided with a recess or protrusion for forming turbulent flow near the hole and at least in front of the vehicle. When the air flow generated in the housing or the base part flows on the outer surface of the housing or the base part and hits the recess or protrusion, the air flow in a flow-regulated state becomes turbulent due to the recess or protrusion, resulting in a pressure difference between the inside and outside of the hole. This makes it possible to prevent the generation of wind noise due to air being sucked out, and there is no need to reduce the hole diameter or block the hole with special parts as in the past. , prevents water drainage,
This has excellent effects such as no need to prepare special parts and increase costs.

[Brief explanation of the drawing]

Figures 1 to 3 are views showing one embodiment of the present invention, in which Figure 1 is a front view showing the whole, Figure 2 is a vertical sectional view of the main part of the mirror housing, and Figure 3 is the same as above. A plan view, FIGS. 4 and 5 are longitudinal cross-sectional views of main parts showing a modification of the present invention, FIG. 6 is a cross-sectional view of main parts showing another modification of the present invention, and FIG. 7 is a plan view of the same. FIG. 8 is a longitudinal cross-sectional view of a main part of a conventional mirror housing. 1...Housing, 2...Mirror glass, 3...
...hole, 4, 5... protrusion, 6... curved part, 7...
...Bent part, 8...Base part, 9...Concave part.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a vehicle mirror device in which one or more holes such as drain holes or mounting screw holes are provided on the outer surface of the mirror housing or its base,
A mirror device for a vehicle having a wind noise prevention structure including a recess or a protrusion for forming turbulent flow near the hole and at least at a position on the front side of the vehicle from the hole. 2. The vehicle mirror device having a wind noise prevention structure according to item 1, wherein the protruding portion is provided in the shape of a dam around the hole. 3. The vehicle mirror device having a wind noise prevention structure according to claim 1, wherein the protrusion is formed by counterboring the periphery of the hole. 4. A bent part that projects outward is formed on the outer surface of the housing or its base, and one or more drain holes or screw tightening holes are formed at a position on the rear side of the vehicle than the bent part. A vehicle mirror device having the wind noise prevention structure according to item 1. 5. The vehicle mirror device having a wind noise prevention structure according to item 1, wherein the recess is a groove or an opening provided around the hole.