JP5012720B2 - Vehicle door mirror structure - Google Patents

Description

  The present invention relates to a vehicle door mirror structure.

Conventionally, an outer mirror that has a guiding projection at the rear end of the hood and deflects the wind that flows over the hood toward the outer wall of the outer mirror, thereby reducing the turbulence of the air flow near the outer mirror and reducing wind noise. A wind noise prevention mechanism and prevention method are known (for example, see Patent Document 1).
JP-A-6-31673

  However, in the wind noise prevention mechanism and the prevention method having the above-described configuration, it is necessary to provide a guide convex shape on the hood, which causes a problem of deterioration in appearance and cost increase.

  An object of the present invention is to obtain a vehicle door mirror structure that can reduce wind noise and does not cause deterioration in appearance and cost.

  In order to solve the above-described problem, the vehicle door mirror structure according to the invention described in claim 1 is provided between the door of the vehicle and the door mirror main body, and has an inner surface facing inward in the vehicle width direction and an outer side in the vehicle width direction. The vehicle door mirror structure includes a mirror stay having an outer side facing the rear side and a rear side facing the rear side of the vehicle, and an angle θ between the inner side and the rear side is in a range of 44 degrees to 55 degrees. And the corner between the outer side surface and the rear side surface is formed in a curved surface, and the curvature radius R of the curved surface is set in a range of 3 mm to 10 mm. .

  In the vehicle door mirror structure according to the first aspect, an angle θ (so-called “dihedral angle”) formed by the inner side surface and the rear side surface of the mirror stay is set in a range of 44 degrees to 55 degrees. Moreover, the corner | angular part between the outer side surface and rear side surface of a mirror stay is formed in the curved surface shape, and the curvature radius R of the said curved surface is set in the range of 3 mm-10 mm. As a result, traveling wind that interferes with the mirror stay when the vehicle travels flows smoothly to the rear of the vehicle, and the generation of vortex flow around the mirror stay is suppressed. Thereby, the wind noise resulting from generation | occurrence | production of a vortex | eddy_current can be reduced. In addition, since the wind noise can be reduced only by making a part of the mirror stay a predetermined shape, the appearance is not deteriorated and the cost is not increased.

  As described above, in the vehicle door mirror structure according to the present invention, wind noise can be reduced, and appearance is not deteriorated and cost is not increased.

<First Embodiment>
FIG. 1 is a side view showing a partial configuration of a vehicle 12 to which a door mirror device 10 configured by applying the vehicle door mirror structure according to the first embodiment of the present invention is applied. FIG. 2 shows a side view of the door mirror device 10, and FIG. 3 shows a front view of the door mirror device 10. In the figure, an arrow FR indicates the front direction of the vehicle, an arrow UP indicates the upward direction of the vehicle, and an arrow IN indicates the inner side of the vehicle width.

  The door mirror device 10 according to the first embodiment includes a door mirror main body 14. The door mirror body 14 includes a mirror 16 (see FIG. 3) for visually recognizing the rear of the vehicle, and the mirror 16 is held by a mirror visor 18. The mirror visor 18 has a streamline shape, thereby reducing wind noise caused by the mirror visor 18 and improving the appearance of the mirror visor 18.

  The mirror visor 18 is connected to an outer panel 22 </ b> A of the front door 22 of the vehicle 12 via a mirror stay 20. The mirror stay 20 is formed in the shape of a prism having a trapezoidal cross section, and as shown in FIG. 4, an inner surface 20A facing inward in the vehicle width direction, an outer surface 20B facing outward in the vehicle width direction, and the front of the vehicle It has a front side 20C facing the side and a rear side 20D facing the vehicle rear side. The mirror stay 20 has a lower end portion fixed to the outer panel 22A, and a mirror visor 18 connected to the upper end portion.

  As shown in FIG. 5, the cross-sectional shape of the mirror stay 20 is long in the vehicle longitudinal direction and thin in the vehicle width direction (note that FIG. 5, FIG. 6, FIG. 7, and FIG. 10 described later). In FIG. 11, the hatching of the cross section is omitted for convenience of explanation). Further, the length dimension of the inner side surface 20A in the vehicle front-rear direction is formed shorter than the length dimension of the outer side surface 20B in the vehicle front-rear direction, and the front side surface 20C moves toward the vehicle rear side toward the vehicle width direction outer side. The rear side surface 20D is an inclined surface that faces the vehicle front side as it goes outward in the vehicle width direction.

  Here, in the first embodiment, the angle θ (dihedral angle) formed by the inner side surface 20A and the rear side surface 20D is set within a range of 44 degrees to 55 degrees, and the inclination of the rear side surface 20D is It is set large. Further, a corner 20E between the outer side surface 20B and the rear side surface 20D (a connection portion between the outer side surface 20B and the rear side surface 20D) is formed in a curved surface, and the curvature radius R (hereinafter referred to as “rear side”) of the curved surface. End angle R ”) is set within a range of 3 mm to 10 mm.

  Next, the operation of the first embodiment will be described.

  In the door mirror device 10 having the above-described configuration, the traveling wind flowing under the mirror visor 18 during vehicle traveling hits the front side surface 20C of the mirror stay 20 as shown by the arrow W1 in FIG. It flows to the vehicle rear side along 20B. At this time, in this door mirror device 10, the angle θ formed by the inner side surface 20A of the mirror stay 20 and the rear side surface 20D is set to be large and the rear end angle R is set to be small, so that the traveling wind can easily go straight. Thus, the traveling wind is prevented from flowing around the rear side of the door mirror body 14.

  On the other hand, for example, in the case of the mirror stay 100 in which the rear end angle R is set large as shown in FIG. 7, the traveling wind (see arrow W <b> 2) around the rear of the mirror stay 100 causes the rear of the door mirror body to move backward. Fluctuating vortices are generated. Although this fluctuating vortex generates a wind noise, the wind noise generated by the fluctuating vortex can be reduced because the generation of the fluctuating vortex is suppressed in the door mirror device 10.

  In particular, in the door mirror device 10, the angle θ formed by the inner side surface 20A of the mirror stay 20 and the rear side surface 20D is set in the range of 44 degrees to 55 degrees, and the rear end angle R is in the range of 3 mm to 10 mm. As shown in FIG. 8 and FIG. 9, the wind noise can be effectively reduced.

  Here, FIG. 8 is a diagram showing the relationship between the angle θ formed and the wind noise when the rear end angle R is set to 10 mm. It can be seen from FIG. 8 that the wind noise is reduced below the reference value when the angle θ formed is in the range of 44 degrees to 55 degrees. FIG. 9 is a diagram showing the relationship between the rear end angle R and the wind noise when the angle θ formed is set to 47 degrees. From FIG. 9, it can be seen that the wind noise is reduced below the reference value when the rear end angle R is in the range of 3 mm to 10 mm. 8 and 9, it can be seen that the formed angle θ is preferably set to 47 to 52 degrees and the rear end angle R is set to 3 to 8 mm. The black circles (●) shown in FIGS. 8 and 9 are experimental data actually obtained. Further, since the rear end angle R cannot be 2.5 mm or less due to the outer collision requirement, a range of less than 3 mm is excluded as an unmanufacturable region.

  As described above, the door mirror device 10 pays attention to the high contribution of the shape of the mirror stay 20 as a cause of the generation of the vortex, and suppresses the generation of the vortex by causing the running wind to flow smoothly behind the mirror stay 20. Thus, the generation of wind noise is suppressed. For this reason, for example, it is particularly effective for a vehicle having a low noise level inside the vehicle, such as a so-called luxury vehicle, where noise outside the vehicle is conspicuous. Further, it is also effective for a vehicle in which the mirror stay 20 is increased in size with an increase in the size of the mirror 16 (mirror visor 18) due to a request for expanding the field of view. In addition, the door mirror device 10 is preferable because the wind noise is reduced only by making a part of the mirror stay 20 into a predetermined shape, so that the appearance is not deteriorated and the cost is not increased.

Next, another embodiment of the present invention will be described. In addition, about the structure and operation | movement fundamentally similar to the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is provided, and the description is abbreviate | omitted.
<Second Embodiment>
FIG. 10 is a cross-sectional view of a mirror stay 30 that is a constituent member of a door mirror device configured by applying a vehicle door mirror structure according to a second embodiment of the present invention. The mirror stay 30 has basically the same configuration as the mirror stay 20 according to the first embodiment, and includes an inner side surface 20A, an outer side surface 20B, a front side surface 20C, and a rear side surface 20D. However, in this mirror stay 30, the outer surface 20B is recessed in a curved shape toward the inner side in the vehicle width direction, and the angle formed by the vehicle rear side portion of the outer surface 20B and the rear side surface 20D is small.

In this embodiment, the traveling wind that flows toward the rear side of the vehicle along the outer surface 20B is deflected toward the outer side in the vehicle width direction as indicated by an arrow W3 in FIG. The wraparound is more effectively suppressed. Thereby, since generation | occurrence | production of the vortex | eddy_current behind the door mirror main body 14 is suppressed favorably, generation | occurrence | production of the wind noise resulting from generation | occurrence | production of a vortex | eddy_current can be suppressed further more favorably.
<Third Embodiment>
FIG. 11 is a cross-sectional view of a mirror stay 40 that is a constituent member of a door mirror device configured by applying a vehicle door mirror structure according to a third embodiment of the present invention. The mirror stay 40 has basically the same configuration as the mirror stay 20 according to the first embodiment, and includes an inner side surface 20A, an outer side surface 20B, a front side surface 20C, and a rear side surface 20D. However, in this mirror stay 40, the outer surface 20B is inclined so as to go outward in the vehicle width direction toward the vehicle rear side, and the cross-sectional area of the mirror stay 40 is enlarged on the vehicle rear side.

  In this embodiment, the traveling wind that flows toward the rear side of the vehicle along the outer surface 20B is deflected outward in the vehicle width direction as indicated by an arrow W4 in FIG. The wraparound is more effectively suppressed. Thereby, since generation | occurrence | production of the vortex | eddy_current behind the door mirror main body 14 is suppressed favorably, generation | occurrence | production of the wind noise resulting from generation | occurrence | production of a vortex | eddy_current can be suppressed further more favorably.

1 is a side view showing a partial configuration of a vehicle to which a door mirror device configured by applying a vehicle door mirror structure according to a first embodiment of the present invention is attached. It is a side view of the door mirror apparatus shown by FIG. It is a front view of the door mirror apparatus shown by FIG. It is a perspective view of the mirror stay which comprises the door mirror apparatus shown by FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is sectional drawing corresponding to FIG. 5, and is a figure for demonstrating the state which traveling wind interfered with the mirror stay. It is sectional drawing which shows the comparative example of the mirror stay which concerns on the 1st Embodiment of this invention. It is a diagram which shows the relationship between the angle (theta) which the inner surface and rear side surface of the mirror stay concerning the 1st Embodiment of this invention make, and a wind noise. It is a diagram which shows the relationship between the curvature radius R of the corner | angular part between the outer side surface and rear side surface of the mirror stay which concerns on the 1st Embodiment of this invention, and a wind noise. It is a cross-sectional view of the mirror stay which is a structural member of the door mirror apparatus comprised by applying the vehicle door mirror structure which concerns on the 2nd Embodiment of this invention. It is a cross-sectional view of the mirror stay which is a structural member of the door mirror apparatus comprised by applying the vehicle door mirror structure which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Door mirror apparatus 12 Vehicle 14 Door mirror main body 20 Mirror stay 20A Inner side surface 20B Outer side surface 20D Rear side surface 20E Corner 22 Front door 30 Mirror stay 40 Mirror stay

Claims (1)

A vehicle comprising a mirror stay provided between a door of a vehicle and a door mirror body and having an inner surface facing inward in the vehicle width direction, an outer surface facing outward in the vehicle width direction, and a rear side facing toward the rear side of the vehicle Door mirror structure,
An angle θ between the inner side surface and the rear side surface is set within a range of 44 degrees to 55 degrees, and a corner portion between the outer side surface and the rear side surface is formed in a curved shape, A vehicle door mirror structure, wherein a radius of curvature R is set in a range of 3 mm to 10 mm.

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