JP2018030414A - Vehicle helmholtz type sound absorption structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle with a Helmholtz type sound absorbing structure for reducing low frequency noise at low cost.
[Solution]
The Helmholtz-type sound absorbing structure 1 includes a vehicle interior material 10 facing the passenger compartment and a container component 15 that is a separate body from the vehicle interior material 10. The specific part 11 of the vehicle interior material 10 and the container component 15 are airtightly joined to each other and form a closed space 18 in cooperation. A vent hole 15 b for communicating the closed space 18 to the outside is formed in one of the specific portion 11 and the container component 15.
[Selection] Figure 1

Description

  The present invention relates to a Helmholtz type sound absorbing structure installed in a vehicle.

  It is well known to use a foam material as a sound absorbing structure of a vehicle. However, although the foam material can absorb high-frequency noise, it cannot absorb low-frequency noise such as engine sound.

  Patent Document 1 discloses a sound absorbing structure that is installed on the back side of an instrument panel of a vehicle and can absorb low-frequency noise. FIG. 22 shows a container having a closed space and a vent hole as a Helmholtz type sound absorbing structure.

JP 2010-52632 A

Since the container which comprises the Helmholtz type sound absorption structure shown in FIG. 22 of patent document 1 is comprised separately from the instrument panel, and is comprised by one molded product which has closed space, manufacturing cost increases.
Patent Document 1 also describes that the container may be formed integrally with an instrument panel, but it is difficult and possible to form a container having a closed space integrally with an instrument. However, the manufacturing cost increases.

The present invention has been made to solve the above problems, and in a Helmholtz type sound absorbing structure for a vehicle, includes a vehicle interior material facing a passenger compartment, and a container constituent member that is separate from the vehicle interior material, The specific part of the vehicle interior material and the container constituent member are airtightly joined to each other and form a closed space in cooperation with each other, and the closed space is formed in one of the specific part and the container constituent member. A vent hole for communicating with the outside is formed.
According to the said structure, the low frequency noise in a vehicle can be reduced by the Helmholtz type sound absorption structure which has closed space and a vent hole. Moreover, since the closed space is formed by joining a specific part of the vehicle interior material and the container constituent member, the manufacturing is simple and the manufacturing cost can be reduced.

Preferably, the vehicle interior material and the container constituent member are connected by fastening means, and the specific portion of the vehicle interior material and the container constituent member are joined together with a pressing force by the fastening means.
According to the said structure, the specific site | part of a vehicle interior material and a container structural member can be joined with high airtightness, and a high sound absorption effect can be exhibited.

Preferably, the fastening means includes a locking hook portion formed on the container component member and an elastic claw formed on the vehicle interior material, and the locking hook is provided at a distal end portion of the elastic claw. An inclined surface that hits the portion is formed.
According to the said structure, the attachment to the vehicle interior material of a container structural member is easy. Moreover, the pressing force which goes to a vehicle interior material can be provided to a locking collar part by the inclined surface of an elastic nail | claw.

Preferably, the container component is disposed on the back side of the vehicle interior material, and is airtightly joined to a back surface of a specific portion of the vehicle interior material, and the vent hole is formed in the container component. .
According to the above configuration, since the sound absorbing structure does not appear on the vehicle interior side surface of the vehicle interior material, the appearance is not impaired even when the front surface of the vehicle interior material is exposed to the vehicle interior.

Preferably, the container constituent member has an internal space where the vehicle interior material side is opened, and an opening peripheral edge of the internal space is airtightly joined to a back surface of a specific portion of the vehicle interior material.
According to the said structure, even if it provides a sound absorption structure, it can avoid that the shape of a vehicle interior material becomes complicated.

Preferably, the specific site | part of the said vehicle interior material and the said container structural member are joined via the sealing material.
According to the said structure, the airtightness of the junction part of the specific site | part of a vehicle interior material and a container structural member can be improved.

Preferably, an annular convex portion narrower than the surface of the locking hook portion is provided on either the surface of the locking hook portion of the container component or the annular region on the back surface of the specific portion corresponding to the locking hook portion Is formed.
According to the said structure, the airtightness of the junction part of the specific site | part of a vehicle interior material and a container structural member can be improved.

  In one aspect, the vehicle interior material is a door trim, and the container component is disposed between the door trim and an outer door panel.

Preferably, the specific part and the container component are disposed at a height facing the occupant's waist in the door trim, and the container component has a bottom wall located on the opposite side of the opening peripheral edge. The bottom wall is separated from the door trim and approaches the door panel, and the container component has a partition that extends in the vehicle width direction and divides the internal space into a plurality of divided spaces. Is closed by the door trim and provided as the closed space, and the vent hole is formed in the bottom wall of the container component for each of the plurality of closed spaces.
According to the above configuration, the Helmholtz type sound absorbing structure can play a role of absorbing collision energy by being brittlely destroyed at the time of a vehicle side collision.

In another aspect, an upper member of the console armrest is provided as the vehicle interior material, a lower member of the console armrest is provided as the container component, and one of the upper member and the lower member is the upper member and the lower member. It has an annular rib that extends toward the other side of the member and whose tip is joined to the other side in an airtight manner.
According to the said structure, a Helmholtz type sound absorption structure can be comprised with the upper member and lower member of the existing console armrest, without adding a container structural member newly.

  According to the present invention, a Helmholtz type sound absorbing structure that reduces low frequency noise can be provided in a vehicle at low cost.

It is sectional drawing of the Helmholtz type sound absorption structure for vehicles which concerns on 1st Embodiment of this invention. It is a disassembled perspective view of the sound absorption structure. It is sectional drawing of the Helmholtz type sound absorption structure for vehicles which concerns on 2nd Embodiment of this invention. It is sectional drawing of the Helmholtz type sound absorption structure for vehicles which concerns on 3rd Embodiment of this invention. It is sectional drawing of the Helmholtz type sound absorption structure for vehicles which concerns on 4th Embodiment of this invention. (A) is the longitudinal cross-sectional view of the vehicle door incorporating the Helmholtz type sound absorption structure which concerns on 5th Embodiment of this invention, (B) is the principal part expanded sectional view. It is a side view of the console armrest of the vehicle incorporating the Helmholtz type sound absorption structure which concerns on 6th Embodiment of this invention. It is AA arrow sectional drawing in FIG. It is a principal part expanded sectional view of FIG.

Hereinafter, a Helmholtz sound absorbing structure for a vehicle according to a first embodiment of the present invention (hereinafter simply referred to as a sound absorbing structure) will be described with reference to FIGS. 1 and 2.
The sound absorbing structure 1 includes a container component member 15 on the back surface (opposite the vehicle interior) of a vehicle interior material 10 (hereinafter simply referred to as an interior material) such as an instrument panel, a door trim, and a roof trim facing the vehicle interior. It is configured by mounting.

The interior material 10 has a flat rectangular specific portion 11 in a range indicated by an imaginary line in FIG.
On the back surface of the interior material 10, elastic claws 12 are formed at positions away from the center of each side of the specific part 11 by a slight distance. A convex portion 12 a that protrudes inward (specific portion 11 side) is formed at the tip of the elastic claw 12. The convex portion 12 a has an inclined surface 12 b that faces the opposite side of the specific portion 11 and an inclined surface 12 c that faces the specific portion 11.

  The container component 15 has a relatively shallow container shape that forms a rectangle. The container constituent member 15 has an annular locking collar 15a projecting outward from the peripheral edge of the opening, and has a vent hole 15b in the center of the bottom wall opposite to the peripheral edge of the opening. The surface facing the opposite side of the bottom wall of the locking collar 15a is provided as a joining margin 15x described later.

  When the container component 15 is attached to the interior material 10, a sheet-like sealing material 16 having the same shape as the specific portion 11 is attached to the back surface of the specific portion 11 of the interior material 10. This sealing material is made of a discontinuous porous resin and has elasticity.

  When the container constituent member 15 is pushed from the back side of the interior material 10 toward the specific portion 11, the locking hook portion 15 a of the container constituent member 15 hits the inclined surfaces 12 b of the four elastic claws 12, thereby pushing the elastic claws 12. spread.

  When the container constituting member 15 is further pushed in, the locking hook portion 15 a passes over the convex portion 12 a of the elastic claw 12 and reaches the sealing material 16. In this state, since the locking collar 15 is pushed by the inclined surface 12c of the elastic claw 12, the joining margin 15x of the locking collar 15a is changed to the joining margin 11x of the specific portion 11 in a state where the sealing material 16 is compressed. Airtightly joined. As is clear from this explanation, the locking collar 15a and the elastic claw 12 constitute a fastening means T for fastening the container component 15 toward the specific part 11.

  The closed space 18 is obtained by closing the internal space of the container component 15 at the specific portion 11. The closed space 18 communicates with the outside (specifically, the space on the back side of the interior material 10) through the vent hole 15b.

  The sound absorbing structure 1 having the above-described configuration can absorb low-frequency noise such as engine sound as in a normal Helmholtz sound absorber. The closed space 18 is not formed by a single molded part, but is formed by joining the specific region 11 of the interior material 10 and the container component 15, so that the manufacturing is easy and the manufacturing cost is reduced. Can do.

  The shapes of the specific part 11 and the container component 15 are not particularly limited, and may be circular. The sealing material 16 may have an annular shape corresponding to the joint allowances 11x and 15x. Alternatively, the interior material 11 may have an internal space, and the internal space may be closed with a plate-shaped container component member 15 to form a closed space.

  Next, another embodiment of the present invention will be described with reference to the drawings. In these embodiments, components corresponding to the embodiments described earlier are denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 3 shows a second embodiment of the present invention. In this second embodiment, the sealing material 16 of the first embodiment is not used, and instead, a ring-shaped convex portion narrower than the surface of the locking collar 15a on the surface facing the interior material 10 of the locking collar 15a. 15y is formed. Since this convex part 15y is narrow, it is strongly joined to the specific part 11 by the pressing force from the elastic claw 12, and high airtightness is ensured.

  FIG. 4 shows a third embodiment of the present invention. In the third embodiment, the interior material 10 has a step portion 13, and the step portion 13 is included in the specific portion 11. In this embodiment, a notch 15 m for receiving the stepped portion 13 is formed in the peripheral wall of the container constituting member 15. In the present embodiment, the elastic claw 12 on the side of the step portion 13 presses the edge of the bottom wall of the container component 15.

  FIG. 5 shows a fourth embodiment of the present invention. In this 4th Embodiment, the connection part 14 of plate member 10a, 10b adjacent to the specific site | part 11 of the interior material 10 has crossed. In this embodiment, a notch 15 n for receiving the raised connecting portion 14 is formed in the peripheral wall of the container component 15.

  FIG. 6 shows a fifth embodiment of the present invention. In the fifth embodiment, the Helmholtz type sound absorbing structure 2 is provided on the door. The door includes a metal door panel and a door trim 20 (vehicle interior material). The door panel includes an outer panel (not shown) exposed to the outside and an inner panel 29. A door trim 20 is attached to the inner panel 29.

  In the door trim 20, a specific portion 21 is set at an intermediate height thereof, specifically, below the pull handle portion 20a and above the door pocket portion 20b. The specific part 21 corresponds to the height of the occupant's waist.

The container constituting member 25 is disposed on the back side of the specific portion 21 of the door trim 20, that is, between the door trim 20 and the inner panel 29 (door panel).
The container constituent member 25 has an internal space opened to the door trim 20 side, and a bottom wall located on the opposite side of the opening is away from the door trim 20 and is opposed to the inner panel 29. The container constituent member 25 has a plurality of partitions 25a. The partition 25a extends in the vehicle width direction and divides the internal space of the container component 25 into a plurality of spaces 25b. A vent hole 25c is formed in the bottom wall of the container component 25 for each of the plurality of divided spaces 25b.

  The container constituent member 25 is joined to the back surface of the specific portion 21 of the door trim 20 via a sheet-like sealing material 26. Specifically, the opening edge portion of the container constituent member 25 and the end portion of the partition 25 a are joined to the specific portion 21 via the sealing material 26. Thereby, the divided space 25b becomes a closed space.

In this embodiment, two types of fastening means T and T ′ are used. One fastening means T is comprised by the latching hook part 25d formed in the opening edge part of the container structural member 25 and the elastic nail | claw 22 formed in the door trim 20 similarly to 1st Embodiment.
The other fastening means T ′ has a fixing flange 25 e protruding from the peripheral wall along the door trim 20 in the vicinity of the opening edge of the container component 25 and a boss 23 protruding from the back surface of the door trim 20. The tip of the boss portion 23 passes through the fixed flange 25e and is welded to the fixed flange 25e.

  The container component 25 can absorb collision energy by brittle fracture at the time of a vehicle side collision. In a normal vehicle, a cushion for absorbing collision energy at the time of a side collision is arranged at a height corresponding to the occupant's waist, but the container component 25 also plays a role of this cushion. .

  7 to 9 show a sixth embodiment of the present invention. In the sixth embodiment, the Helmholtz-type sound absorbing structure 3 is provided on a console armrest 30b installed on the top of the console box 30a.

  The console armrest 30b includes an upper member 31 (vehicle interior material) and a lower member 35 (container constituent member). An annular rib 35 a protrudes upward from the center of the lower member 35. The upper end edge of the rib 35a is airtightly joined to the lower surface (rear surface) of the upper member 31 via the sealing material 36, whereby the internal space surrounded by the rib 35a becomes the closed space 38. In the upper member 31, a ventilation hole 31 b that connects the closed space 38 to the outside (in this embodiment, connects to the outside via the cushion material 39) is formed in the specific portion 31 a inside the rib 35 a.

The fastening means T ″ for fastening the upper member 31 and the lower member 35 includes a boss portion 32 of the upper member 31 and a tapping screw 33 that passes through the lower member 35 and is screwed into the tapping hole 32 a of the boss portion 32. By this fastening means T ″, the leading edge of the rib 35a is pressed against the specific part 31a of the upper member 31 through the sealing material 36, and is joined with high airtightness.
In the above embodiment, an annular rib projecting downward may be formed on the upper member 31, and the annular rib may be airtightly joined to the lower member 35.

The present invention is not limited to the above-described embodiment, and various aspects can be made.
For example, the vehicle interior material and the container constituent member may be joined by welding or an adhesive.

  The present invention can be applied to a sound absorbing structure of a vehicle.

1, 2, 3 Helmholtz sound absorbing structure 10 Vehicle interior material 11 Specific portion 12 Elastic claw 12c Inclined surface 15 Container component 15a Locking flange portion 15b Vent hole 15y Annular convex portion 16 Sealing material 18 Closed space 20 Door trim (vehicle interior material) )
21 Specific part 25 Container component 25a Partition 25b Divided space (closed space)
25c Ventilation hole 26 Sealing material 29 Inner panel (door panel)
30b Console armrest 31 Upper member (vehicle interior material)
31a Specific part 31b Vent hole 35 Lower member 35a Annular rib 36 Sealing material 38 Closed space T, T ′, T ″ Fastening means

Claims (10)

  A vehicle interior material facing the vehicle compartment and a container component member that is separate from the vehicle interior material, and the specific portion of the vehicle interior material and the container component member are hermetically joined to each other and cooperate with each other. A vehicle-occluded space, and a vent hole for communicating the closed space to the outside is formed in one of the specific part and the container component member. Construction.   The vehicle interior material and the container constituent member are connected by fastening means, and the specific part of the vehicle interior material and the container constituent member are joined with a pressing force by the fastening means. Helmholtz type sound absorbing structure for vehicles as described.   The fastening means has a locking hook portion formed on the container component member and an elastic claw formed on the vehicle interior material, and a tip of the elastic claw is inclined to hit the locking hook portion. The Helmholtz type sound absorbing structure for a vehicle according to claim 2, wherein a surface is formed.   The container constituent member is disposed on the back side of the vehicle interior material, and is airtightly joined to a back surface of a specific part of the vehicle interior material, and the vent hole is formed in the container constituent member. The Helmholtz type sound absorbing structure for a vehicle according to any one of claims 1 to 3.   The container component has an internal space where the vehicle interior material side is open, and an opening peripheral edge of the internal space is airtightly joined to a back surface of a specific part of the vehicle interior material. The Helmholtz type sound absorbing structure for a vehicle according to claim 4.   The Helmholtz type sound absorbing structure for a vehicle according to any one of claims 1 to 5, wherein the specific part of the vehicle interior material and the container constituent member are joined via a sealing material.   An annular convex portion narrower than the surface of the locking hook portion is formed on either the surface of the locking hook portion of the container component or the annular region on the back surface of the specific portion corresponding to the locking hook portion. The Helmholtz type sound absorbing structure for a vehicle according to claim 3, wherein the sound absorbing structure is for a vehicle.   The Helmholtz type sound absorbing structure for a vehicle according to claim 5, wherein the vehicle interior material is a door trim, and the container component is disposed between the door trim and an outer door panel. The specific part and the container component are arranged at a height facing the occupant's waist in the door trim,
The container component has a bottom wall located on the opposite side of the peripheral edge of the opening, the bottom wall being away from the door trim and approaching the door panel,
Further, the container component member has a partition that extends in the vehicle width direction and divides the internal space into a plurality of parts, and the plurality of divided spaces are closed by the door trim and provided as the closed spaces, respectively. 9. The Helmholtz type sound absorbing structure for a vehicle according to claim 8, wherein the ventilation hole is formed in the bottom wall of each of the plurality of closed spaces. An upper member of the console armrest is provided as the vehicle interior material, a lower member of the console armrest is provided as the container component,
One of the upper member and the lower member has an annular rib that extends toward the other of the upper member and the lower member and whose tip is joined to the other in an airtight manner. The Helmholtz type sound absorbing structure for a vehicle according to claim 1 or 2.

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