JP2018130993A - Helmholtz-type sound absorption structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a Helmholtz-type sound absorption structure that can be easily and inexpensively manufactured.SOLUTION: A Helmholtz-type sound absorption structure 1 is installed in a vertically extending pillar trim 2. The pillar trim 2 is formed by connecting a lower end of an upper member 3 and an upper end of a lower member 4 in such a manner that they overlap in a vehicle width direction. A swelling part 35 projecting to the vehicle outer side is formed in the lower end of the upper member 3. The vehicle compartment side of the swelling part 35 is provided as a recessed part 36 oriented to the upper end of the lower member 4. A closed space 10 is formed by closing the recessed part 36 from the vehicle compartment side by the upper end of the lower member 4. A through hole 11 continuous with the closed space 10 is formed in the swelling part 35.SELECTED DRAWING: Figure 3

Description

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

  A sound absorbing structure is attached to the vehicle in order to increase the quietness of the passenger compartment during traveling. Patent Document 1 discloses a Helmholtz type sound absorbing structure disposed on the back side (the vehicle outer side) of a pillar trim of a vehicle (FIGS. 4 and 7, paragraph 0033).

JP 2010-111347 A

  The sound-absorbing structure shown in Patent Document 1 is composed of one molded product that is separate from the pillar. Therefore, since the manufacturing process of the molded product and the assembly process of the molded product are required, the manufacturing cost increases.

In order to solve the above-described problem, the Helmholtz type sound absorbing structure for a vehicle of the present invention has two interior material ends that are separated from each other, and a closed space is formed between the end portions of the interior materials. One end of one interior material is formed with a through hole that is continuous with the closed space.
According to the above configuration, since the Helmholtz type sound absorbing structure is configured without using dedicated components, the manufacturing cost can be reduced.

Preferably, the end portions of the two interior materials are connected in an overlapped state, and at least one of the interior materials is formed with a recess that opens toward the end of the other interior material. The closed space is formed by bringing the peripheral edge of the recess into contact with the opposing surface of the end of the other interior material with a pressing force in the connected state.
According to the above configuration, the closed space can be formed when the interior material is connected.

In one mode, the peripheral part of the above-mentioned crevice and the above-mentioned counter surface are in contact via a seal member.
In another aspect, an annular projection surrounding the recess is formed on one of the peripheral edge of the recess and the facing surface, and the protrusion abuts the peripheral edge of the recess and the other of the facing surface. Yes.
According to the above configuration, the closed space can be satisfactorily sealed.

Preferably, the end portions of the two interior materials are overlapped in the vehicle width direction, and the through hole is formed in the end portion of the interior material located on the vehicle outer side.
According to the said structure, since a through-hole is formed in the edge part of the interior material of a vehicle outer side, when the edge part of the interior material of a vehicle interior becomes a design surface, the external appearance is not impaired.

Preferably, the two interior materials are an upper member and a lower member of a pillar trim, and a lower end portion of the upper member and an upper end portion of the lower member are coupled so as to overlap in the vehicle width direction, and the lower ends of these upper members The closed space is formed between the portion and the upper end portion of the lower member.
According to the above configuration, the Helmholtz type sound absorbing structure can be provided in the pillar trim without using a dedicated component.

Preferably, a bulging portion protruding outward is formed at a lower end portion of the upper member, and a passenger compartment side of the bulging portion is provided as a concave portion opening toward the upper end portion of the lower member, When the upper end of the lower member is closed from the vehicle compartment side, the closed space is formed, and the through hole is formed in the bulging portion.
According to the said structure, since the bulging part and the through-hole were formed in the lower end part of the upper member located in the vehicle outer side, the external appearance at the side of the compartment of a pillar trim is not impaired.

  Preferably, a belt guide portion for guiding the seat belt is formed in the bulging portion so as to extend in the vehicle length direction and further protrude outward from the bulging portion.

  According to the present invention, a Helmholtz type sound absorbing structure can be manufactured at low cost.

It is the front view which looked at the pillar trim which has a Helmholtz type sound absorption structure concerning a 1st embodiment of the present invention from the cabin side. It is a principal part enlarged front view of the pillar trim. It is the perspective view which looked at the same pillar trim from the vehicle outside. It is the disassembled perspective view which looked at the pillar trim from the vehicle outer side. It is a principal part expansion perspective view of FIG. It is AA arrow sectional drawing in FIG. It is a BB arrow sectional view in FIG. It is CC sectional view taken on the line in FIG. It is DD sectional view taken on the line in FIG. It is the figure equivalent to FIG. 6C which shows the Helmholtz type sound absorption structure which concerns on 2nd Embodiment of this invention. FIG. 6C is a view corresponding to FIG. 6C showing a Helmholtz type sound absorbing structure according to a third embodiment of the present invention.

  Hereinafter, a Helmholtz type sound absorbing structure for a vehicle (hereinafter, simply referred to as a sound absorbing structure) constituting a first embodiment of the present invention will be described with reference to FIGS. The sound absorbing structure 1 of the present embodiment is installed on a pillar trim 2 extending in the vertical direction.

As shown in FIGS. 1 and 2, the pillar trim 2 is configured by connecting a lower end portion of an upper member 3 (interior material) and an upper end portion of a lower member 4 (interior material).
The upper member 3 has a main wall portion 31 and side wall portions 32 and 32 and has a U-shaped cross section, and the lower member 4 also has a main wall portion 41 and side wall portions 42 and 42 and has a U-shaped cross section. ing. At the lower end portion of the upper member 3, the main wall portion 31 is retracted toward the vehicle outer side, and the side wall portions 32, 32 are retracted toward the inner side, and the upper end portion of the lower member 4 is overlapped with the lower end portion from the vehicle compartment side. Are connected together. In this connected state, the main wall portion 41 of the lower member 4 is flush with the main wall portion 31 except the lower end portion of the upper member 3, and the side wall portions 42 and 42 of the lower member 4 exclude the lower end portion of the upper member 3. It is flush with the side walls 32, 32.

Next, the connection structure of the lower end part of the upper member 3 and the upper end part of the lower member 4 is demonstrated.
At the lower end portion of the upper member 3, two engagement hole portions 33, 33 that are separated from each other in the vehicle length direction are formed in the main wall portion 31, and a notch portion 34 is formed in each side wall portion 32. The bottom edge of each notch 34 is a latch receiving portion 34a.

  At the upper end portion of the lower member 4, the main wall portion 41 is provided with two engaging projections 43, 43 that protrude to the outside of the vehicle and are separated in the vehicle length direction. Is provided. Each locking claw portion 44 protrudes inward (on the main wall portion 41 side), and as shown in FIG. 6B, a hooking flat surface 44 a facing the main wall portion 41 and a guide inclined surface facing the opposite side of the main wall portion 41. 44b.

  When connecting the upper member 3 and the lower member 4, as shown in FIGS. 6C and 6D, by inserting the engaging protrusions 43, 43 of the lower member 4 into the engaging hole portions 33, 33 of the upper member 3, The lower member 4 is positioned with respect to the upper member 3.

  When the lower member 4 is pushed into the upper member 3 in the above positioning state, the side wall portions 32, 32 of the upper member 3 hit the guide inclined surface 44b of the latching claw portion 44 of the lower member 4, and the lower member 4 is in the vehicle length direction. 5 and 6B, the side wall portion 32 of the upper member 3 returns to the original shape over the guide inclined surface 44b of the latching claw portion 44, as shown in FIGS. The latch receiving portion 34 a is locked to the latch plane 44 a of the latch claw portion 44.

  The sound absorbing structure 1 is provided at an overlapping portion between the lower end portion of the connected upper member 3 and the upper end portion of the lower member 4. Details will be described below.

  As shown in FIGS. 4, 5, and 6 </ b> A, the main wall portion 31 at the lower end portion of the upper member 3 is formed with a bulging portion 35 that protrudes outward of the vehicle. The passenger compartment side of the bulging portion 35 is provided as a recess 36 that opens toward the main wall portion 41 (opposing surface) of the upper end portion of the lower member 4. The recess 36 has a rectangular opening and a relatively shallow bottom. A peripheral edge 36 a of the opening of the recess 36 faces the main wall 41 of the lower member 4, and the seal member 5 is interposed between the peripheral edge 36 a and the main wall 41. The seal member 5 has an annular shape corresponding to the opening of the recess 36, and is formed of a porous sound absorbing material such as a nonwoven fabric or urethane, and has elasticity.

  As shown in FIG. 4, the seal member 5 is arranged on the vehicle exterior side of the main wall portion 41 at the upper end portion of the lower member 4 before the connecting step of the lower end portion of the upper member 3 and the upper end portion of the lower member 4 described above. Paste it on the surface. As shown in FIG. 6B, the lower end of the upper member 3 and the upper end of the lower member 4 are connected, and the latch receiving portion 34a of the upper member 3 is locked to the latching claws 44, 44 of the lower member 4. In this state, the peripheral edge 36a of the recess 36 and the main wall 41 of the lower member 4 come into contact with each other with a pressing force, and the seal member 5 is compressed. Thereby, since the recessed part 36 is airtightly closed by the main wall part 41, the closed space 10 is formed.

  As shown in FIGS. 5 and 6A, for example, four through holes 11 are formed in the bulging portion 35. The sound absorbing structure 1 is configured by the communication hole 11 communicating the closed space 10 with the outside outside the vehicle.

  A belt guide portion 37 that protrudes outward from the vehicle and extends in a belt shape in the vehicle length direction is provided at an intermediate portion in the vertical direction of the bulging portion 35. The belt guide portion 37 abuts on a seat belt (not shown) extending from a belt winding device (not shown) to guide the drawing and winding.

  The sound absorbing structure 1 having the above configuration is not formed by an independent dedicated molded product, but is formed at the joint portion by connecting the lower end portion of the upper member 3 and the upper end portion of the lower member 4 in the pillar trim 2. Therefore, manufacture is easy and manufacturing cost can be reduced.

  Next, another embodiment of the present invention will be described. In the following embodiment, only the configuration different from the above embodiment will be described, and the same components are denoted by the same reference numerals and the description thereof will be omitted.

  FIG. 7 shows a second embodiment of the present invention. In the second embodiment, the seal member 5 is formed in a sheet shape. The seal member 5 covers the opening of the concave portion 33 and is supported by being sandwiched between the peripheral edge portion 36 a and the main wall portion 41. In this embodiment, the sound absorbing action by the seal member 5 is obtained.

  FIG. 8 shows a third embodiment of the present invention. In the third embodiment, an annular protrusion 38 is formed on the peripheral edge 36 a of the recess 36 of the upper member 3 so as to surround the opening of the recess 36. The protrusion 38 is pressed against the main wall portion 41 of the lower member 4 to ensure the airtightness of the closed space 10.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, various modifications can be employ | adopted.
The lower member may have an internal space, and the closed space may be formed by closing the internal space with the upper member.
The lower end of the upper member may be overlapped with the upper end of the lower member from the passenger compartment side.
The through hole may be formed to connect the closed space and the vehicle compartment side.
The number of through holes may be one or more.
In the third embodiment, the protrusion is provided on the upper member, but may be provided on the main wall portion of the lower member.
There is no restriction | limiting in particular in the shape of a recessed part, You may make it circular.
The upper member and the lower member may be joined by welding or an adhesive.
In the above-described embodiment, the interior material is the upper member and the lower member of the pillar trim, but the interior material may be a door trim, an instrument panel, a roof trim, or the like.

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

DESCRIPTION OF SYMBOLS 1 Helmholtz type sound absorption structure 10 Closed space 11 Through hole 2 Pillar trim 3 Upper member (interior material)
35 bulging portion 36 concave portion 36a peripheral edge portion 37 belt guide portion 38 protrusion 4 lower member (interior material)
5 Seal members

Claims (8)

  End portions of two interior materials that are separate from each other are overlapped, a closed space is formed between the end portions of the interior materials, and a through hole that is connected to the closed space is formed at an end portion of one of the interior materials. A Helmholtz type sound absorbing structure for a vehicle.   The end portions of the two interior materials are connected in an overlapped manner, and at least one interior material end portion is formed with a recess opening toward the other interior material end portion. 2. The Helmholtz type for a vehicle according to claim 1, wherein the closed space is formed by abutting a portion and a facing surface of an end of the other interior material with a pressing force in the connected state. Sound absorbing structure.   The Helmholtz type sound absorbing structure for a vehicle according to claim 2, wherein a peripheral edge portion of the concave portion and the facing surface are in contact with each other via a seal member.   An annular protrusion surrounding the recess is formed on either the peripheral edge of the recess or the facing surface, and the protrusion is in contact with the peripheral edge of the recess and the other of the facing surface. The Helmholtz type sound absorbing structure for a vehicle according to claim 2.   The end portions of the two interior materials are overlapped in the vehicle width direction, and the through holes are formed in the end portions of the interior materials located outside the vehicle. Helmholtz type sound absorbing structure for vehicles.   The two interior materials are an upper member and a lower member of a pillar trim, and a lower end portion of the upper member and an upper end portion of the lower member are connected so as to overlap each other in the vehicle width direction. The Helmholtz type sound absorbing structure for a vehicle according to claim 1, wherein the closed space is formed between the upper end of the member.   A bulging portion protruding outward from the vehicle is formed at the lower end portion of the upper member, and the vehicle compartment side of the bulging portion is provided as a concave portion facing the upper end portion of the lower member, and this concave portion is provided as the upper end portion of the lower member. 7. The Helmholtz type sound absorbing structure for a vehicle according to claim 6, wherein the closed space is formed by closing from a passenger compartment side, and the through hole is formed in the bulging portion.   8. The bulge portion is formed with a belt guide portion for guiding a seat belt extending in the vehicle length direction and projecting further outward from the bulge portion. Helmholtz type sound absorbing structure for vehicles.

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