Noise reduction member and vent duct with the same

Abstract

To obtain a noise reduction member which makes assembly of a vent duct to a body panel easy.SOLUTION: A noise reduction member 30 is attached to a vent duct 20 including a duct body part 22 assembled to an opening formed at a body panel and having a communication port which allows communication between the vehicle inner side and the vehicle outer side, and an on-off valve which may open or close the communication port. The noise reduction member 30 includes: a noise reduction part 32 disposed at the vehicle inner side relative to the duct body part 22 and having cylinder parts 34 in each of which one end is open to the communication port side and the other end is open to the vehicle inner side; and attachment parts 36 which attach the noise reduction part 32 to the duct body part 22.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vent duct for a vehicle, and more particularly to a sound deadening member attached to the vent duct. [Background technology]

[0002] In the vehicle bend duct disclosed in the following Patent Document 1, a duct body that is attached to an opening formed in a body panel and multiple cylindrical sound deadening parts are integrally molded. Reflected sound and incident sound cancel each other out in the sound deadening parts, thereby suppressing the intrusion of noise from the outside to the inside of the vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-158704 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned prior art, the multiple cylindrical silencer parts integrally molded with the duct main body have a predetermined length. When assembling the vent duct to the vehicle body, it is necessary to assemble the duct main body to the body panel while passing the multiple cylindrical silencer parts through an opening formed in the body panel, which makes the assembly work complicated.

[0005] In consideration of the above, an object of the present invention is to provide a sound deadening member and a vent duct with a sound deadening member that facilitates assembly of the vent duct to a body panel. [Means for solving the problem]

[0006] The first aspect of the sound-absorbing member of the present invention is a sound-absorbing member that is assembled to an opening formed in a body panel and attached to a vent duct that includes a duct main body having a communication port that connects the inside and outside of the vehicle, and an opening / closing valve that can open and close the communication port, and is equipped with: a sound-absorbing part that is arranged on the inside of the vehicle relative to the duct main body, and has a tubular part with one end that opens toward the communication port and the other end that opens toward the inside of the vehicle, and an attachment part that attaches the sound-absorbing part to the duct main body.

[0007] In a first aspect, a sound deadening member attached to a vent duct that is assembled to an opening formed in a body panel and includes a duct main body having a communication port that communicates between the inside and outside of the vehicle, and an opening / closing valve that can open and close the communication port of the duct main body, includes a sound deadening part and an attachment part. The sound deadening part is disposed on the inside of the vehicle relative to the duct main body, and has a cylindrical part with one end opening to the communication port side and the other end opening to the inside of the vehicle. The attachment part attaches the sound deadening part to the duct main body. In this aspect, after the duct main body of the vent duct is assembled to the opening formed in the body panel, the sound deadening member can be assembled to the duct main body from the inside of the vehicle. This makes it easier to assemble the vent duct to the body panel.

[0008] A sound deadening member according to a second aspect of the present invention is the sound deadening member according to the first aspect, wherein the sound deadening portion has a plurality of the cylindrical portions having different lengths.

[0009] In the second aspect, the muffling section has a plurality of cylindrical sections of different lengths, and the plurality of cylindrical sections function as parts of the side branch type muffler, thereby making it possible to reduce sounds of a plurality of frequencies.

[0010] A third aspect of the present invention relates to the sound deadening member of the first aspect, wherein the sound deadening portion has a lattice frame shape in which the plurality of cylindrical portions are arranged in a lattice pattern.

[0011] In the third aspect, since the sound-absorbing part is formed in a lattice frame shape as described above, for example, when the sound-absorbing member is manufactured by injection molding of resin, it is possible to simplify the shape of the molding die, thereby enabling reduction in manufacturing costs.

[0012] A fourth aspect of the sound deadening member of the present invention is any one of the first to third aspects, wherein at least an inner wall surface of the cylindrical portion of the sound deadening portion is made of a porous material.

[0013] In the fourth aspect, since it is configured as described above, the sound absorbing effect of the inner wall surface of the cylindrical portion can improve the sound deadening performance.

[0014] A vent duct with a sound-absorbing member of a fifth aspect of the present invention comprises a duct main body that is attached to an opening formed in a body panel and has a communication port that connects the inside and outside of the vehicle, and a vent duct that has an opening valve that can open and close the communication port, and a sound-absorbing member of any one of the first to fourth aspects.

[0015] In a fifth aspect, a duct body of a vent duct is assembled to an opening formed in a body panel. The duct body has a communication port that communicates between the inside and outside of the vehicle, and the communication port is opened and closed by an opening / closing valve. A sound deadening member has a sound deadening section disposed on the inside of the vehicle relative to the duct body, and the sound deadening section is attached to the duct body by an attachment section. The sound deadening member is any one of the first to fourth aspects, and therefore the above-mentioned effects can be obtained. Effect of the Invention

[0016] As described above, according to the present invention, the vent duct can be easily attached to the body panel. [Brief description of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a state in which a vent duct with a sound deadening member according to an embodiment is attached to a body panel. FIG. [Diagram 2] FIG. 2 is a perspective view showing a vent duct with a sound deadening member according to the embodiment. [Diagram 3] FIG. 2 is a rear view showing the vent duct with sound deadening members according to the embodiment. [Figure 4] FIG. 2 is a side view showing the vent duct with the sound deadening member according to the embodiment. [Diagram 5] FIG. 1 is a perspective view showing a vent duct provided in a vent duct with a sound deadening member according to an embodiment, as viewed from the rear side; [Figure 6] FIG. 4 is a partial cross-sectional view showing a state in which the sound deadening member is being attached to the vent duct. [Figure 7] FIG. 4 is a partial cross-sectional view showing a state in which the sound deadening member has been completely attached to the vent duct. [Figure 8] FIG. 4 is a side view showing a first modified example of the sound deadening member. [Figure 9] FIG. 11 is a partial cross-sectional view showing a second modified example of the sound deadening member. [Figure 10] FIG. 11 is a partial cross-sectional view showing a third modified example of the sound deadening member. [Figure 11] 1 is a conceptual diagram illustrating a typical behavior of sound when the outer side of the vehicle is open in a cylindrical portion of the sound deadening member; FIG. [Figure 12] 10 is a conceptual diagram illustrating the behavior of sound when the outer side of the cylindrical portion of the sound deadening member is closed; FIG. [Figure 13] FIG. 11 is a partial cross-sectional view showing a fourth modified example of the sound deadening member. [Figure 14] FIG. 11 is a partial cross-sectional view showing a fifth modified example of the sound deadening member. [Figure 15] FIG. 13 is a partial cross-sectional view showing a sixth modified example of the sound deadening member. [Figure 16] FIG. 13 is a partial cross-sectional view showing a seventh modified example of the sound deadening member. [Figure 17] FIG. 13 is a partial cross-sectional view showing an eighth modified example of the sound deadening member. [Figure 18] 10 is a partial cross-sectional view for explaining the sound absorbing effect when the sound deadening member is made of a porous material. FIG. [Figure 19] 4 is a schematic diagram showing an example in which a cylindrical portion of a sound deadening member has a two-layer structure of resin and porous material. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, a bend duct 10 with a sound deadening member according to an embodiment of the present invention will be described with reference to Figs. 1 to 19. In each drawing, some reference numerals may be omitted in order to make the drawing easier to see. In addition, an arrow FR shown as appropriate in each drawing indicates the vehicle front side of a vehicle 12 to which the vent duct 20 is attached, an arrow UP indicates the vehicle upper side of the vehicle 12, and an arrow OUT indicates the outer side of the vehicle 12 in the vehicle width direction.

[0019] As shown in Fig. 1, a bend duct 10 with a sound deadening member is attached to a quarter panel 16 that constitutes a part of the rear side of a vehicle in a body panel 14 of a vehicle 12. The bend duct 10 with a sound deadening member is covered from the outside of the vehicle by a rear bumper cover (not shown).

[0020] As shown in Fig. 2 to Fig. 4, the bend duct 10 with a sound absorbing member is composed of a vent duct 20 and a sound absorbing member 30. As shown in Fig. 1 to Fig. 5, the vent duct 20 includes a duct main body 22 assembled to an opening 18 (see Fig. 4) formed in a quarter panel 16, and a plurality (five in this case) of on-off valves 26 (see Fig. 1) attached to the duct main body 22. The duct main body 22 is manufactured by, for example, injection molding of a resin, and includes a frame 22A, an outer peripheral wall 22B, an inner peripheral wall 22C, a plurality (four in this case) of vertical partitions 22D, and a plurality (three in this case) of horizontal partitions 22E.

[0021] The frame portion 22A has a rectangular frame shape when viewed from the vehicle width direction, and the inside of the frame portion 22A is a communication port 24 that is open in the vehicle width direction. An outer peripheral wall portion 22B is provided on the vehicle outer side of the frame portion 22A, and an inner peripheral wall portion 22C is provided on the vehicle inner side of the frame portion 22A. The outer peripheral wall portion 22B extends outward in the vehicle width direction from the frame portion 22A and is provided so as to surround the communication port 24 except for the vehicle lower side when viewed from the vehicle width direction, and the portion on the outer side in the vehicle width direction is formed into a flange shape.

[0022] 5, the inner peripheral wall portion 22C has a rectangular frame shape surrounding the communication opening 24 when viewed from the vehicle width direction. The inner peripheral wall portion 22C fits into an opening 18 provided in the quarter panel 16. Four locking claws 22C1 are provided on the outer circumferential surface of the inner peripheral wall portion 22C, and each of the locking claws 22C1 is hooked onto the periphery of the opening 18, thereby fixing the duct main body 22 to the quarter panel 16.

[0023] The vertical partitions 22D are each formed in a plate shape extending in the vehicle front-rear direction with the plate thickness direction being in the vehicle vertical direction, and are arranged so as to divide the communication opening 24 into five in the vehicle vertical direction. The horizontal partitions 22E are each formed in a rod shape extending in the vehicle vertical direction, and are arranged so as to divide the communication opening 24 into four in the vehicle front-rear direction. In the following description, the parts of the communication opening 24 divided into five in the vehicle vertical direction as described above will be referred to as the first communication opening 24A, the second communication opening 24B, the third communication opening 24C, the fourth communication opening 24D, and the fifth communication opening 24E, in that order from the upper side of the vehicle.

[0024] 1 is a rectangular sheet-like member made of an elastically deformable material (elastic body) such as rubber. The on-off valves 26 are disposed for the first communication port 24A, the second communication port 24B, the third communication port 24C, the fourth communication port 24D, and the fifth communication port 24E, respectively. Under normal circumstances, the first communication port 24A, the second communication port 24B, the third communication port 24C, the fourth communication port 24D, and the fifth communication port 24E are closed by the on-off valves 26.

[0025] Three locking holes (reference numerals omitted) are formed at intervals in the vehicle front-rear direction on the edge of the on-off valve 26 on the vehicle upper side, and three locking protrusions 25 corresponding to the locking holes are provided on the edges of the first communication port 24A, the second communication port 24B, the third communication port 24C, the fourth communication port 24D and the fifth communication port 24E on the vehicle upper side. Then, each locking protrusion 25 is fitted into each locking hole of each on-off valve 26, so that each on-off valve 26 is swingably suspended from the duct main body 22.

[0026] In the vent duct 20 configured as described above, when the air pressure inside the vehicle (inside the passenger compartment) becomes higher than the air pressure outside the vehicle, such as when an air conditioning system (not shown) is operated or when the vehicle 12 is traveling at a predetermined speed or above, each opening / closing valve 26 is pushed by the air inside the vehicle and swings, thereby connecting the inside and outside of the vehicle through the communication port 24.

[0027] 2 to 4, the sound deadening member 30 is made up of a sound deadening section 32 arranged on the vehicle interior side with respect to the duct body 22 of the vent duct 20, and an attachment section 36 that attaches the sound deadening section 32 to the duct body 22. The sound deadening section 32 is manufactured, for example, by injection molding of resin, and has a frame-shaped section 32A, a plurality (four in this case) of horizontal lattice sections 32B, and a plurality (three in this case) of vertical lattice sections 32C, all of which are integral with each other, forming a lattice frame shape.

[0028] The frame-shaped portion 32A has a rectangular frame shape similar to the inner peripheral wall portion 22C of the duct main body 22, and is arranged in contact with the inner side of the inner peripheral wall portion 22C. The communication port 24 of the duct main body 22 communicates with the inner side of the vehicle through the inside of the frame-shaped portion 32A. The horizontal lattice portions 32B are each plate-shaped with the plate thickness direction being the vehicle vertical direction and extending in the vehicle front-rear direction, and are arranged so as to divide the inner side of the frame-shaped portion 32A into five in the vehicle vertical direction. The vertical lattice portions 32C are each plate-shaped with the plate thickness direction being the vehicle front-rear direction and extending in the vehicle vertical direction, and are arranged so as to divide the inner side of the frame-shaped portion 32A into four in the vehicle vertical direction. The horizontal lattice portions 32B are arranged at positions overlapping with the vertical partition portions 22D of the duct main body 22 when viewed from the vehicle width direction, and the vertical lattice portions 32C are arranged at positions overlapping with the horizontal partition portions 22E of the duct main body 22 when viewed from the vehicle width direction.

[0029] The muffling section 32 configured as described above has a plurality of (here, 20) square cylindrical tubular sections 34. As an example, the plurality of tubular sections 34 are set to the same size, and have the same length along the vehicle width direction. Each tubular section 34 has one end 34A (see Figs. 11 and 12) that is the end on the vehicle exterior side opening toward the communication port 24, and the other end 34B (see Figs. 11 and 12) that is the end on the vehicle interior side opening toward the vehicle interior side. The one end 34A of each tubular section 34 can be opened and closed by the opening / closing valve 26. When the air pressure inside the vehicle is equal to or lower than the air pressure outside the vehicle, the one end 34A of each tubular section 34 is configured to be closed by the opening / closing valve 26.

[0030] As shown in Fig. 2, Fig. 6 and Fig. 7, the mounting portion 36 is composed of a plurality of (four in this example) mounting claws 38 extending integrally from the frame-shaped portion 32A of the sound deadening portion 32. These mounting claws 38 are plate-shaped with the plate thickness direction being in the vertical direction of the vehicle, and are elastically deformable in the vertical direction. Two of the four mounting claws 38 extend from the upper end of the frame-shaped portion 32A toward the vehicle exterior, are aligned at intervals in the vehicle front-rear direction, and have barbs (reference numerals omitted) protruding toward the vehicle lower side at their tips. The remaining two of the four mounting claws 38 extend from the lower end of the frame-shaped portion 32A toward the vehicle exterior, are aligned at intervals in the vehicle front-rear direction, and have barbs (reference numerals omitted) protruding toward the vehicle upper side at their tips.

[0031] The sound deadening member 30 having the above-mentioned mounting portion 36 can be attached from the vehicle interior side to the duct body 22 of the vent duct 20 assembled to the quarter panel 16. During this attachment, as shown in Figures 6 and 7, two attachment claws 38 extending from the upper end of the frame-shaped portion 32A are hooked onto the upper end of the duct body 22, and two attachment claws 38 extending from the lower end of the frame-shaped portion 32A are hooked onto the lower end of the duct body 22. This completes the attachment of the sound deadening member 30 to the duct body 22.

[0032] 6 to 10, the duct body 22 and the sound deadening member 30 are shown in a schematic manner. The structure for mounting the sound deadening member 30 to the duct body 22 is not limited to the above and can be modified as appropriate. For example, as shown in FIG. 8, a configuration may be adopted in which a plurality of mounting claws 38 extending from the sound deadening member 32 are inserted into a plurality of mounting holes 23 (see FIG. 3 and FIG. 5) formed in the frame portion 22A of the duct body 22 to be locked. For example, as shown in FIG. 9, a configuration may be adopted in which the flange portion 22C2 extending from the frame portion 22A of the duct body 22 and the flange portion 32A1 extending from the frame portion 32A of the sound deadening member 30 are fastened with a fastening member 40 such as a screw or a clip. For example, as shown in FIG. 10, a configuration may be adopted in which the flange portion 22C2 of the duct body 22 and the flange portion 32A1 of the sound deadening member 30 are attached with an attachment member 42 such as a magnet or a double-sided adhesive tape.

[0033] In the bend duct 10 with the sound deadening member having the above-mentioned configuration, when the air pressure inside the vehicle is higher than the air pressure outside the vehicle, the on-off valve 26 is pushed by the air inside the vehicle, and the communication port 24 of the duct main body 22 and one end 34A of the cylindrical portion 34 are opened as shown in Fig. 11. At this time, a part of the sound S3 traveling inside the cylindrical portion 34 from the outside to the inside of the vehicle is reflected near the other end 34B of the cylindrical portion 34 due to the difference in acoustic impedance between the inside of the cylindrical portion 34 and the inside of the vehicle. As a result, the sound S3 traveling inside the cylindrical portion 34 from the outside to the inside of the vehicle and the reflected sound S4 of this sound cancel each other out.

[0034] On the other hand, as shown in FIG. 12, when the communication port 24 of the duct main body 22 and one end 34A of the tubular portion 34 are closed by the on-off valve 26, the tubular portion 34 and the on-off valve 26 function as a side branch type silencer.

[0035] In detail, when one end 34A of the cylindrical portion 34 is closed by the on-off valve 26, a part of the sound S1 traveling from the vehicle interior enters the cylindrical portion 34 near the other end 34B of the cylindrical portion 34, and the sound S2 is reflected by the on-off valve 26. At this time, the sound S2 reflected by the on-off valve 26 is delayed in phase with respect to the sound S1 that did not travel into the cylindrical portion 34 by the amount of time it travels back and forth inside the cylindrical portion 34. When the length of the cylindrical portion 34 is a quarter of the wavelength of the sound traveling from the vehicle interior, the sound S2 reflected by the on-off valve 26 and the sound S1 that did not travel into the cylindrical portion 34 are in opposite phase and cancel each other out.

[0036] In this manner, in this embodiment, by setting the length of the cylindrical portion 34 to a predetermined length, i.e., a quarter of the wavelength of the sound, depending on the frequency of the sound to be silenced, it is possible to reduce the sound of that frequency traveling from the inside of the vehicle. Therefore, in this embodiment, it is possible to silence noise from both the outside and the inside of the vehicle.

[0037] Furthermore, in this embodiment, after the duct body 22 of the vent duct 20 is assembled to the opening 18 formed in the quarter panel 16, the sound deadening member 30 can be assembled to the duct body 22 from the vehicle interior side. This makes it easier to assemble the vent duct 20 to the quarter panel 16. That is, when the duct body and multiple cylindrical sound deadening parts are integrally molded as in the prior art described in the Background Art section, when assembling the vent duct to the vehicle body, it is necessary to assemble the duct body to the body panel while passing the multiple cylindrical sound deadening parts through the opening of the body panel. As a result, the assembling work of the vent duct becomes complicated, but this can be avoided in this embodiment.

[0038] In addition, in this embodiment, the sound deadening section 32 of the sound deadening member 30 has a lattice frame shape in which a plurality of cylindrical sections 34 are arranged in a lattice shape, so that when the sound deadening member 30 is manufactured by injection molding of resin, for example, the shape of the molding die can be simplified, and manufacturing costs can be reduced. In addition, the moldability of the sound deadening section 32 is improved, and the yield of the sound deadening member 30 is improved.

[0039] Moreover, in this embodiment, the frame-shaped portion 32A of the sound-absorbing portion 32 of the sound-absorbing member 30 has a rectangular frame shape similar to the inner peripheral wall portion 22C of the duct main body 22, so that the mounting structure of the sound-absorbing member 30 to the duct main body 22 can be made simple.

[0040] Furthermore, in this embodiment, the multiple horizontal lattice portions 32B of the muffling section 32 are arranged at positions overlapping with the multiple vertical partition portions 22D of the duct main body 22 when viewed from the vehicle width direction, and the multiple vertical lattice portions 32C of the muffling section 32 are arranged at positions overlapping with the multiple horizontal partition portions 22E of the duct main body 22 when viewed from the vehicle width direction. This reduces the viscous resistance of air passing through the communication port 24 of the duct main body 22 and the inside of the muffling section 32, making it easier to ensure the ventilation performance of the vehicle 12.

[0041] The arrangement and number of the horizontal lattice portion 32B and the vertical lattice portion 32C are not limited to those described above and can be changed as appropriate. For example, as shown in Fig. 13, the arrangement and number of the horizontal lattice portion 32B and the vertical lattice portion 32C (i.e., the arrangement and number of the cylindrical portion 34) may be changed.

[0042] In the above embodiment, the multiple cylindrical parts 34 are configured to have the same size, but the present invention is not limited to this, and may include cylindrical parts 34 of different sizes, as shown in Fig. 14. This makes it possible to reduce sounds of multiple frequencies.

[0043] In the above embodiment, the multiple tubular portions 34 are formed in a rectangular tube shape, but the present invention is not limited to this. For example, as shown in Fig. 15, the multiple tubular portions 34 may be formed in a tube shape with a hexagonal cross section, or as shown in Fig. 16, the multiple tubular portions 34 may be formed in a cylindrical shape. Although not shown in the drawings, the multiple tubular portions may have a triangular cross section.

[0044] In the above embodiment, the multiple cylindrical parts 34 are configured to have the same length, but this is not limited to the above. For example, as shown in Fig. 17, the multiple cylindrical parts 34 may have different lengths. In the example shown in Fig. 17, the multiple cylindrical parts 34 each having a hexagonal cross section are configured to have different lengths, and sounds of multiple frequencies can be reduced.

[0045] In the above embodiment, the sound deadening member 30 is made of resin, but the present invention is not limited to this. For example, the sound deadening performance can be improved by making the sound deadening member 30 of a porous material. Examples of porous materials include those made by compressing a foam such as urethane foam, those made by compressing felt, and those made by compressing nonwoven fabric.

[0046] When the sound deadening member 30 is made of a porous material, as shown in Fig. 18, the sound S is absorbed when it is reflected on the inner wall surface of the cylindrical portion 34, improving the sound deadening performance. This type of sound absorption also occurs when the sound deadening member 30 is made of resin, but using a porous material can improve the sound absorption properties.

[0047] It is not necessary that the entire sound deadening member 30 is made of a porous material, but it is sufficient that at least the inner wall surface of the cylindrical portion 34 is made of a porous material. For example, as shown in Fig. 19, an outer portion 341 of the cylindrical portion 34 may be made of resin, and an inner portion 342 of the cylindrical portion 34 may be made of a porous material.

[0048] In addition, in the above embodiment, a configuration has been described in which the bend duct 10 with a sound-absorbing material is provided on the quarter panel 16 of the vehicle 12, but this is not limited to this, and the bend duct 10 with a sound-absorbing material may be provided on another portion of the body panel 14 of the vehicle 12.

[0049] In addition, the present invention can be implemented in various modifications without departing from the spirit and scope of the present invention. Furthermore, the scope of the present invention is not limited to the above-described embodiment. [Explanation of symbols]

[0050] 10 Vent duct with sound absorbing material 12 Vehicles 14 Body Panel 18 Openings 20 Vent Duct 22 Duct body 24 Connecting port 26 On-off valve 30 Sound deadening materials 32 Silencer 34 Cylindrical section 34A One end 34B Other end 36 Mounting part

Claims

1. A sound deadening member to be attached to a vent duct, the sound deadening member being assembled to an opening formed in a body panel, the vent duct having a duct body having a communication port that communicates between an inside side of a vehicle and an outside side of the vehicle, and an opening / closing valve that can open and close the communication port, a muffling section that is disposed on the vehicle interior side of the duct main body and has a cylindrical section with one end that opens to the communication port side and the other end that opens to the vehicle interior side; an attachment portion for attaching the muffling portion to the duct main body; A sound-deadening member comprising:

2. The sound deadening member according to claim 1 , wherein the sound deadening portion has a plurality of the cylindrical portions each having a different length.

3. The sound deadening member according to claim 1 , wherein the sound deadening portion has a lattice frame shape in which the plurality of cylindrical portions are arranged in a lattice pattern.

4. The sound deadening member according to any one of claims 1 to 3, wherein at least an inner wall surface of the cylindrical portion of the sound deadening portion is made of a porous material.

5. a vent duct having a duct body portion attached to an opening formed in a body panel and having a communication port that communicates between an inside side of the vehicle and an outside side of the vehicle, and an opening / closing valve that can open and close the communication port; A sound deadening member according to any one of claims 1 to 3; A vent duct with a sound-absorbing member.

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