JP2023151844A - Vehicle approach notification device mounting structure - Google Patents

Abstract

To reduce sound transmitted into a cabin and suppress deterioration of aerodynamic performance of a vehicle when a vehicle approach notification device is mounted on the vehicle.SOLUTION: A plurality of slit-like holes 16 are formed in an undercover 14 constituting a part of a vehicle floor part 12. The slit-like holes 16 extend in a longitudinal direction (width direction) of a vehicle 10. On the undercover 14, an inclined wall 18 is installed for each hole 16. The inclined wall 18 is a component which covers a part of the hole 16 along the hole 16. A speaker 22 is installed above the holes 16 so that a sound production surface of the speaker 22 faces the holes 16.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a mounting structure for a vehicle approach notification device that notifies pedestrians and the like of the approach of a vehicle.

2. Description of the Related Art Vehicle approach notification devices are known that are mounted on vehicles such as electric cars and hybrid cars and emit notification sounds to alert pedestrians and the like to the approach of a vehicle.

When the vehicle approach notification device is installed in a closed space such as an engine compartment or a bumper, the notification sound is less likely to be emitted outside the vehicle, and as a result, the sound pressure level of the notification sound outside the vehicle is reduced. Additionally, the notification sound is more likely to propagate into the vehicle interior. In order to ensure the sound pressure level of the notification sound outside the vehicle (for example, to obtain a sound pressure level higher than the level specified by law), increase the sound pressure level of the notification sound emitted from the vehicle approach notification device. is possible. However, increasing the sound pressure level increases the amount of sound transmitted into the vehicle interior, which increases the noise inside the vehicle interior. As described above, when a vehicle approach notification device is installed in a closed space, it is difficult to simultaneously increase the sound pressure level of the notification sound outside the vehicle and reduce the sound transmitted into the vehicle interior. Become.

In order to deal with this, it is conceivable to form an opening in the vehicle floor and install a vehicle approach notification device over the opening.

For example, the vehicle approach notification device described in Patent Document 1 is installed on an opening formed in an undercover that constitutes a part of the vehicle floor. The notification sound emitted from the vehicle approach notification device is emitted from the opening toward the road surface, and propagates through the space between the vehicle floor and the road surface.

Japanese Patent Application Publication No. 2011-235774

By installing the vehicle approach notification device over the opening formed in the vehicle floor, the notification sound is radiated from the opening to the outside of the vehicle, thereby reducing the amount of sound transmitted into the vehicle interior. However, if an opening is formed in the vehicle floor, air may enter the vehicle from outside the vehicle through the opening while the vehicle is running, which may reduce the aerodynamic performance of the vehicle.

An object of the present disclosure is to reduce sound transmitted into the vehicle interior and to suppress deterioration of the aerodynamic performance of the vehicle when a vehicle approach notification device is mounted on the vehicle.

One aspect of the present disclosure is a mounting structure for a vehicle approach notification device installed above a slit-like hole formed in an undercover of a vehicle, the structure including a sloped wall that covers a part of the slit-like hole. This is a vehicle approach notification device mounting structure characterized by having the following features.

According to the above configuration, the notification sound emitted from the vehicle approach notification device is radiated to the outside of the vehicle from the slit-shaped hole, so that it is possible to reduce the sound transmitted into the vehicle interior. Further, since a portion of the slit-shaped hole is covered by the inclined wall, the vehicle is less susceptible to air resistance through the hole. As a result, deterioration in the aerodynamic performance of the vehicle can be suppressed.

The vehicle approach notification device mounting structure described above may further include a rib surrounding the vehicle approach notification device installed above the slit-shaped hole.

The slit-shaped hole may extend in the width direction of the vehicle, and the inclined wall may be installed along the slit-shaped hole.

According to the configuration of the present disclosure, when the vehicle approach notification device is mounted on a vehicle, it is possible to reduce sound transmitted into the vehicle interior and to suppress deterioration of the aerodynamic performance of the vehicle.

FIG. 3 is a plan view of the front part of the vehicle seen from below. FIG. 3 is a plan view of a slit-shaped hole formed in the undercover, viewed from below the vehicle. FIG. 2 is a perspective view of a slit-shaped hole viewed diagonally from above the vehicle. FIG. 3 is a perspective view showing a speaker installed above a slit-shaped hole. FIG. 3 is a plan view of a slit-shaped hole viewed from above the vehicle. 2 is a sectional view taken along line VI-VI in FIG. 1. FIG. It is a graph showing the sound pressure level of notification sound outside the vehicle. 2 is a sectional view taken along line VI-VI in FIG. 1. FIG.

Hereinafter, a structure in which a vehicle approach notification device is mounted will be described with reference to FIGS. 1 to 6. FIG. 1 is a plan view of the front portion of a vehicle viewed from below. FIG. 2 is a plan view of a slit-shaped hole formed in the undercover viewed from below the vehicle. FIG. 3 is a perspective view of the slit-shaped hole viewed from diagonally above the vehicle. FIG. 4 is a perspective view showing a speaker installed above a slit-shaped hole. FIG. 5 is a plan view of the slit-shaped hole viewed from above the vehicle. FIG. 6 is a sectional view taken along line VI-VI in FIG.

The vehicle 10 is an electric vehicle, a hybrid vehicle, or the like. As shown in FIG. 1, an undercover 14 that constitutes a part of the vehicle floor 12 is attached to the lower part of the vehicle 10. The undercover 14 is a member that covers the engine compartment installed at the front of the vehicle 10 from below.

A plurality of slit-shaped holes 16 are formed in the undercover 14. Each hole 16 is an elongated hole extending in the left-right direction (vehicle width direction) of the vehicle 10, and is formed in line in the front-rear direction of the vehicle 10. For example, the plurality of holes 16 are formed on the driver's seat side, the passenger seat side, or between them. Here, as an example, three holes 16 are formed in the undercover 14, but the number is not particularly limited.

As shown in FIGS. 3 to 6, the undercover 14 is provided with an inclined wall 18 that covers a portion of each hole 16. The inclined wall 18 is installed inside the vehicle 10 (that is, on the upper side of the vehicle 10 with respect to the undercover 14). The inclined wall 18 is installed to extend in the left-right direction of the vehicle 10 along the hole 16 at a position on the rear side in the longitudinal direction of the vehicle 10 with the hole 16 in between. The sloped wall 18 slopes forward from its rear position to partially cover the hole 16. The angle of inclination is, for example, 45°, but its value may vary depending on the shape of the vehicle body, etc.

Furthermore, ribs 20 (projecting members) surrounding the plurality of holes 16 are installed on the undercover 14 . For example, circular ribs 20 are installed to surround the plurality of holes 16.

As shown in FIGS. 4 and 6, the speaker 22 is arranged above the plurality of holes 16 so that the sounding surface of the speaker 22 faces the hole 16 (that is, the sounding surface faces downward from the vehicle 10). will be installed. Since the speaker 22 is installed above the plurality of holes 16, the speaker 22 is surrounded by the ribs 20. The speaker 22 is an example of a vehicle approach notification device. For example, speaker 22 is installed within the engine compartment. The notification sound emitted from the speaker 22 is emitted from the hole 16 toward the outside of the vehicle 10 (for example, the road surface). As shown in FIG. 6, the speaker 22 is attached to the vehicle body 28 of the vehicle 10 using a mounting bracket 24, a bolt 26, or the like. In this way, the speaker 22 is not attached directly to the undercover 14 but to the vehicle body 28. Since it is not necessary to directly attach the speaker 22 to the undercover 14, there is no need to change the mounting structure of the vehicle approach notification device depending on the shape of the vehicle body, and the mounting structure according to the embodiment can be applied to a plurality of different vehicle types. Can be done.

Further, the speaker 22 is electrically connected to the control device 30. In response to the output signal from the control device 30, a notification sound is emitted from the speaker 22.

According to the embodiment described above, since the sound-producing surface of the speaker 22 faces the hole 16, the notification sound emitted from the speaker 22 is radiated from the hole 16 to the outside of the vehicle 10. Therefore, compared to the case where no holes are formed, sound transmitted into the vehicle interior can be reduced. In this way, the notification sound is efficiently radiated to the outside of the vehicle 10, so even if the sound pressure level of the notification sound emitted from the speaker 22 is not increased, the target sound pressure level (for example, the (Sound pressure level higher than the level specified by) can be obtained. Further, since the hole 16 has a slit-like shape, it is possible to prevent foreign substances such as mud and stones from entering the inside of the vehicle 10.

Furthermore, since the inclined wall 18 covering a portion of the hole 16 is installed, the vehicle 10 is less susceptible to air resistance caused by air entering the vehicle 10 through the hole 16. As a result, it is possible to suppress deterioration of the aerodynamic performance of the vehicle 10 compared to the case where the inclined wall 18 is not installed.

Moreover, since the rib 20 is installed so as to surround the speaker 22, it is possible to suppress the notification sound emitted from the speaker 22 from propagating into the vehicle 10. As a result, it is possible to reduce the sound transmitted into the vehicle interior.

Referring to FIG. 7, the sound pressure level of the notification sound outside the vehicle 10 will be described. FIG. 7 is a graph showing the sound pressure level. The horizontal axis shows the frequency [Hz] of the notification sound, and the vertical axis shows the sound pressure level [dB] of the notification sound. The sound pressure level shown in FIG. 7 is a value measured outside the vehicle 10 (eg, below the undercover 14).

The symbol A in FIG. 7 indicates the sound pressure level obtained by the configuration according to the embodiment (the configuration in which the hole 16 is formed and the rib 20 is installed). The symbol B indicates the sound pressure level obtained by the configuration according to the comparative example (the configuration in which the hole 16 is not formed and the rib 20 is not installed). The sound pressure level obtained by the embodiment and the sound pressure level obtained by the comparative example are the same in the sound pressure level of the notification sound emitted from the speaker 22.

According to the embodiment, a higher sound pressure level can be obtained outside the vehicle 10 than in the comparative example. Since the notification sound emitted from the speaker 22 can be efficiently radiated to the outside of the vehicle 10, the sound transmitted into the vehicle interior can be reduced compared to the comparative example. For example, the sound pressure level of sound transmitted into the vehicle interior can be reduced by about 10 dB.

In order to obtain the same sound pressure level as in the embodiment in the comparative example, it is necessary to increase the sound pressure level itself of the notification sound emitted from the speaker 22. However, in this case, the sound transmitted into the vehicle interior also increases, resulting in an increase in the noise inside the vehicle interior. According to the embodiment, since there is no need to increase the sound pressure level of the notification sound emitted from the speaker 22, the sound transmitted into the vehicle interior does not increase.

The size of the holes 16, the number of holes 16, the distance between the speaker 22 and the holes 16, etc. are designed according to the structure of the vehicle body so that the notification sound is efficiently radiated to the outside of the vehicle 10. be done. Further, the shape of the hole 16 is not limited to a slit-like shape, but may be a circular shape, a rectangular shape, an elliptical shape, or the like. Even in this case, an inclined wall covering a part of the hole is installed for each hole.

In the embodiment described above, the inclined wall 18 which is a separate member from the undercover 14 is installed, but the inclined wall 18 may constitute a part of the undercover 14. For example, as shown in FIG. 8, the hole 16 may be formed by punching, and the punched portion may be bent to form the inclined wall 18.

Reference Signs List 10 vehicle, 12 vehicle floor, 14 undercover, 16 hole, 18 inclined wall, 20 rib, 22 speaker, 24 mounting bracket, 26 bolt, 28 vehicle body, 30 control device.

Claims (3)

A mounting structure for a vehicle approach notification device installed above a slit-shaped hole formed in an undercover of a vehicle,
A structure for mounting a vehicle approach notification device, characterized in that it has an inclined wall that covers a part of the slit-shaped hole. The vehicle approach notification device mounting structure according to claim 1,
further comprising a rib surrounding the vehicle approach notification device installed above the slit-shaped hole;
A vehicle approach notification device mounting structure characterized by the following. In the vehicle approach notification device mounting structure according to claim 1 or claim 2,
The slit-shaped hole extends in the width direction of the vehicle,
The inclined wall is installed along the slit-shaped hole,
A vehicle approach notification device mounting structure characterized by the following.

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