JP7671027B2 - Vent duct surrounding structure - Google Patents

Description

The present invention relates to the surrounding structure of a vent duct.

Patent Document 1 discloses a deck side trim that is attached to the inside of the side wall of the luggage compartment inside an automobile, and is made of an injection foam molded thermoplastic resin having a foamed layer and a non-foamed layer.

JP 2010-111016 A

However, in electric vehicles, road noise is more noticeable because there is no engine noise. For this reason, there is a demand to further improve the sound insulation of the vent duct, which is one of the paths through which road noise is transmitted into the vehicle interior.

The present invention was made in consideration of the above circumstances, and aims to provide a surrounding structure for a vent duct that can effectively block the sound transmitted through the vent duct.

In order to achieve the above object, the peripheral structure of the vent duct of the present invention comprises:
A vent duct provided in a body panel of a vehicle;
a sound insulation member installed on an inner side of the body panel;
Equipped with
The sound-proofing member is
a sound absorbing member provided at a position facing the vent duct;
An expandable bellows portion provided on the outer periphery;
has.

With this configuration of the vent duct peripheral structure, the distance and inclination of the sound absorbing member can be adjusted by expanding and contracting the bellows. This allows the sound absorbing member to be precisely positioned opposite the vent duct, whose position varies depending on the vehicle model, and the sound transmitted through the vent duct can be effectively absorbed and reduced by the sound absorbing member.

The vent duct peripheral structure of the present invention can provide a vent duct peripheral structure that can effectively block transmitted sound from the vent duct.

1 is a schematic cross-sectional view of one side of a rear portion of a vehicle provided with a vent duct; 2 is a schematic plan view of a rear portion of a vehicle in which a vent duct is provided, as viewed from the inside of the body. FIG. 3 is a schematic cross-sectional view of a sound-insulating member illustrating the structure of the sound-insulating member. FIG. 10A and 10B are schematic cross-sectional views of a sound-insulating member illustrating adjustment of the attitude of a sound-absorbing member in the sound-insulating member. 10A and 10B are schematic cross-sectional views of a sound-insulating member illustrating adjustment of the attitude of a sound-absorbing member in the sound-insulating member. 10A and 10B are schematic cross-sectional views of a sound-insulating member illustrating adjustment of the attitude of a sound-absorbing member in the sound-insulating member. FIG. 1 is a schematic cross-sectional view of one side of a rear portion of a vehicle provided with a vent duct, illustrating a reference example. 1 is a graph illustrating sound insulation in the surrounding structures of the vent duct of this embodiment and a reference example. 10 is a schematic cross-sectional view of a sound-proof member according to a first modified example. FIG. 11 is a schematic cross-sectional view of a sound-proof member according to a second modified example. FIG. 11 is a schematic cross-sectional view of a sound-proof member according to a third modified example. FIG. 13 is a schematic cross-sectional view of a sound-proof member according to a fourth modified example. FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
Fig. 1 is a schematic cross-sectional view of one side of a rear part of a vehicle provided with a vent duct, and Fig. 2 is a schematic plan view of the rear part of the vehicle provided with the vent duct as viewed from the inside of the body.

As shown in Figures 1 and 2, a vent duct 11 is provided in the rear of a vehicle such as an automobile. The vent duct 11 is provided in a side panel 13. The side panel 13 is joined to a floor panel 14 to form the body of the vehicle.

The vent duct 11 is constructed by assembling a resin duct body 16 into a hole 15 formed in a side panel 13. The duct body 16 is molded from a resin such as polypropylene (PP), and has a structure in which a butterfly valve (not shown) is provided at an air outlet through which air can pass.

A share panel 21 is provided on the vehicle inner side of the side panel 13. An opening 22 is formed in this share panel 21. This opening 22 has a larger opening area than the hole 15 of the vent duct 11, and the vent duct 11 is disposed within the range of the opening 22 in a plan view.

A soundproofing member 25 is attached to the shared panel 21, and the opening 22 is blocked by this soundproofing member 25.

An interior material 26 is provided on the inside of the vehicle in the share panel 21. This interior material 26 is a deck side trim that forms the inner wall of the luggage compartment, and has a convex portion 27 that protrudes to the outside of the vehicle. This interior material 26 is positioned so that a part of the convex portion 27 fits into the opening 22 of the share panel 21.

In addition, exterior materials 28 such as an outer panel and a rear bumper are provided on the vehicle exterior side of the side panel 13, and the exterior side of the vehicle of the vent duct 11 is enclosed by this exterior material 28.

The above-described structure of the vent duct 11 allows the air in the vehicle cabin to be smoothly discharged from the vent duct 11 when fresh air is introduced into the vehicle cabin by an air conditioning system or the like.

FIG. 3 is a schematic cross-sectional view of the sound-insulating member, illustrating the structure of the sound-insulating member.
As shown in Fig. 3, the sound insulation member 25 has a sound absorbing member 31 and a bellows portion 35. The sound absorbing member 31 is, for example, a porous material such as felt or glass wool formed into a plate shape. The sound insulation member 25 has a plate-shaped portion 32, and the sound absorbing member 31 is attached to the surface of the plate-shaped portion 32. The bellows portion 35 is integrally formed on the outer edge of the plate-shaped portion 32. The bellows portion 35 is disposed on the side opposite to the attachment side of the sound absorbing member 31, and is capable of expanding and contracting in the thickness direction of the sound insulation member 25. The sound insulation member 25 also has an edge portion 33 on the side of the bellows portion 35 opposite to the plate-shaped portion 32.

As shown in FIG. 1, the sound insulation member 25 is assembled to the share panel 21 from the inside of the vehicle so that the sound absorbing member 31 fits into the opening 22, and the edge 33 is fixed to the inner peripheral edge of the opening 22 by a mounting clip 41. As a result, the opening 22 of the share panel 21 is sealed by the sound insulation member 25. Then, when the sound insulation member 25 is assembled to the share panel 21, the sound absorbing member 31 of the sound insulation member 25 is positioned opposite the vent duct 11. In addition, the sound absorbing member 31 positioned opposite the vent duct 11 is positioned with a gap between it and the vent duct 11.

With the above-mentioned peripheral structure of the vent duct, even if road noise or other noise is transmitted through the vent duct 11, this transmitted sound S can be absorbed by the sound absorbing member 31 of the sound insulation member 25 arranged opposite the vent duct 11. This makes it possible to suppress the intrusion of road noise and other noise into the vehicle interior.

The sound-proofing member 25 is capable of adjusting the distance and inclination of the sound-absorbing member 31 attached to the plate-shaped portion 32 with respect to the edge portion 33 fixed to the inner peripheral edge of the opening 22 by expanding and contracting the bellows portion 35. This allows the bellows portion 35 to be contracted to reduce the amount of protrusion of the sound-absorbing member 31 depending on the position of the vent duct 11, as shown in FIG. 4, or the bellows portion 35 to be expanded to increase the amount of protrusion of the sound-absorbing member 31 depending on the position of the vent duct 11. Also, the amount of expansion and contraction of the bellows portion 35 can be partially adjusted to tilt the bellows portion 35 depending on the inclination relative to the vent duct 11, as shown in FIG. 6.

Here, a reference example will be described.
FIG. 7 is a schematic cross-sectional view of one side of a rear portion of a vehicle provided with a vent duct for explaining a reference example.

As shown in FIG. 7, the reference example does not include a sound-proofing member 25, and the opening 22 is open. In addition, in this reference example, a plate-shaped sound-absorbing member 51 is provided on the vehicle-outer surface of the convex portion 27 of the interior material 26.

In this reference example, the position of the sound-absorbing member 51 cannot be adjusted, so if the positional relationship with the vent duct 11 differs depending on the vehicle model, the sound-absorbing member 51 cannot be positioned in a position opposite the vent duct 11 that is appropriate for absorbing sound. Moreover, in the reference example, the structure is such that the transmitted sound S from the vent duct 11 is suppressed only by the interior material 26 having the sound-absorbing member 51. For this reason, in the reference example, it is difficult to sufficiently suppress the intrusion of the transmitted sound S from the vent duct 11. Furthermore, because there are gaps 52a, 52b between the share panel 21 and the interior material 26, the transmitted sound is more likely to intrude into the vehicle cabin in the reference example of Figure 7 than in Figure 1.

In contrast, according to the peripheral structure of the vent duct of this embodiment, the bellows portion 35 can be expanded or contracted to adjust the position and attitude of the sound absorbing member 31, thereby enabling the sound absorbing member 31 to be precisely positioned opposite the vent duct 11 in a position that can effectively absorb sound. Furthermore, the opening 22 of the share panel 21 is sealed by the sound insulation member 25 without leaving any gaps, so that transmitted sound cannot enter the vehicle interior through the gaps 52a, 52b between the share panel 21 and the interior material 26.

In other words, even if the positional relationship between the vent duct 11 and the opening 22 differs for each vehicle model, the sound-proofing member 25 can be easily attached and the sound-absorbing member 31 can be precisely positioned opposite the vent duct 11, so that the transmitted sound S from the vent duct 11 can be effectively absorbed and reduced by the sound-absorbing member 31.

In addition, the sound-absorbing material 31 of the sound-proofing material 25 and the interior material 26 are overlapped with an air layer between them to form a double structure, so the intrusion of transmitted sound S from the vent duct 11 can be effectively suppressed.

FIG. 8 is a graph illustrating the sound insulation properties of the peripheral structures of the vent ducts of the present embodiment and the reference example.
As shown in FIG. 8, according to the structure of this embodiment, the transmitted sound S can be suppressed over substantially the entire frequency range, and the sound insulation performance can be significantly improved, compared to the structure of the reference example.

In addition, according to this embodiment, the opening 22 of the share panel 21 is sealed without gaps by the sound-proofing member 25, and the position of the sound-absorbing member 31 of the sound-proofing member 25 can be adjusted, so that the sound-absorbing member 31 can be positioned with high precision in a position that effectively prevents dust, exhaust gas, etc. from entering through the vent duct 11, thereby enhancing the effect of preventing the intrusion of dust, exhaust gas, etc.

Next, various modified examples of the sound-proofing member 25 will be described.

(Variation 1)
FIG. 9 is a schematic cross-sectional view of a sound-proof member according to the first modification.
9, the sound insulation member 25 according to the first modification has an air vent hole 32a in the plate-like portion 32 to which the sound absorbing member 31 is attached. According to the sound insulation member 25 according to the first modification, air can be passed through the hole 32a when the vehicle door is opened or closed, thereby allowing the air to be vented satisfactorily.

(Variation 2)
FIG. 10 is a schematic cross-sectional view of a sound-proof member according to the second modification.
10, sound insulation member 25 according to modification 2 has two bellows portions 35A, 35B. One bellows portion 35A is provided on the plate-shaped portion 32 side, and the other bellows portion 35B is provided on the outer periphery side of one bellows portion 35A. These bellows portions 35A, 35B are connected to each other by a connecting plate portion 36. According to sound insulation member 25 according to modification 2, the posture of sound absorbing member 31 can be more satisfactorily adjusted by expanding and contracting two bellows portions 35A, 35B, respectively.

(Variation 3)
FIG. 11 is a schematic cross-sectional view of a sound-proof member according to the third modification.
11 , in the sound insulation member 25 according to the third modification, the bellows portion 35 provided on the edge portion of the plate-like portion 32 is made expandable and contractable along the surface direction of the sound insulation member 25. In the sound insulation member 25 according to the third modification, by expanding and contracting the bellows portion 35, the sound absorbing member 31 attached to the plate-like portion 32 can be moved in the surface direction of the sound insulation member 25 to adjust its position.

(Variation 4)
FIG. 12 is a schematic cross-sectional view of a sound-proof member according to the fourth modification.
As shown in Fig. 12, the sound insulation member 25 according to the fourth modification has two bellows portions 35A and 35B. One bellows portion 35A is provided on the plate-shaped portion 32 side. The other bellows portion 35B is provided on the outer periphery of the one bellows portion 35A and is disposed at a position shifted in the thickness direction of the sound insulation member 25 from the one bellows portion 35A. These bellows portions 35A and 35B are each capable of expanding and contracting along the surface direction of the sound insulation member 25, and the bellows portions 35A and 35B are connected to each other by a connecting plate portion 36. In the sound insulation member 25 according to the fourth modification, the bellows portions 35A and 35B can be expanded and contracted respectively, so that the position along the surface direction of the sound absorbing member 31 attached to the plate-shaped portion 32 can be more appropriately adjusted.

In connected cars, which are constantly connected to the cloud while driving and receive information services through in-car conversation functions, improved voice recognition performance is desirable. Therefore, to improve voice recognition performance, it is necessary for the sensor microphone to be able to detect conversations more clearly, and it is essential to reduce the noise level inside the vehicle, which can hinder detection by the sensor microphone.

In addition, in electric vehicles, the power plant is replaced by a motor from an engine, and as a result, the noise level of the power plant system changes, resulting in increased quietness around low frequencies. As a result, the ratio of interior noise, which is mainly high-frequency wind noise and road noise, increases, making it more noticeable inside the vehicle cabin. Furthermore, vehicles such as electric vehicles require a reduction in high-frequency noise, such as switching noise, that originates from motors and power control units.

In autonomous driving situations, it is necessary to ensure a vehicle interior space that allows occupants to talk clearly with each other as a comfortable mobile space element. Articulation Index (AI value) is an evaluation index that is weighted most heavily near high frequencies, and high-frequency noise must be reduced to improve it. To meet these needs, a sound-absorbing structure with high sound-absorbing performance is desired. As described above, in this embodiment, the sound-absorbing member 31 can be precisely positioned opposite the vent duct 11, and the transmitted sound S from the vent duct 11 can be effectively absorbed and reduced by the sound-absorbing member 31.

11 Vent duct 13 Body panel 25 Sound insulation member 31 Sound absorbing member 35 Bellows portion

Claims (1)

A vent duct provided in a body panel of a vehicle;
a sound insulation member installed on an inner side of the body panel;
Equipped with
The sound-proofing member is
a sound absorbing member provided at a position facing the vent duct;
An expandable bellows portion provided on the outer periphery;
having
Surrounding structure of vent duct.

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