JP2018079809A - Sound absorption material attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound absorption material attachment structure which improves the workability when a sound absorption material is attached to a vehicle interior material and achieves improvement of moldability.SOLUTION: A sound absorption material attachment structure G of a cargo chamber floor plate 10 includes: a plate-like base material part 11 having a through hole 12; a leg part 13 which continues into a part of a peripheral edge of the through hole 12 of the base material part 11 and protrudes from a rear surface of the base material part 11; and a head part 14 laterally protruding from a tip of the leg part 13 to the through hole 12 side. The head part 14 is disposed so as to be fitted in the through hole 12 when viewed in an axial direction of the through hole 12. The head part 14 has a conical shape guide surface 14a which tapers in a direction away from the base material part 11. The guide surface 14a is configured to guide a slit S of a sound absorption material 20 to the leg part 13. In a state where the leg part 13 is inserted into the slit S of the sound absorption material 20, a surface of the sound absorption material 20 which is opposite to the base material part 11 is engaged with the head part 14.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sound absorbing material mounting structure for mounting a sound absorbing material to a vehicle interior material.

A sound absorbing material is attached to an interior material for a vehicle of an automobile in order to reduce external noise from entering the vehicle interior space.
The sound absorbing material mounting structure for an automobile trim (interior material) shown in Patent Document 1 below includes a plate-like base material portion, leg portions having a U-shaped cross section protruding from the back surface of the base material portion, and It has a latching portion that protrudes laterally from a pair of side edges of the leg portion and faces the base material portion at an interval, and a flat plate-shaped clip seat that closes the tip of the leg portion.
The sound absorbing material has a hole, and with the leg portion inserted into the hole, the surface of the sound absorbing material opposite to the base material portion is locked by the pair of locking portions, so that the sound absorbing material is It is attached to the trim.

JP 2003-252125 A

  In the sound absorbing material mounting structure of Patent Document 1, since the clip seat at the tip of the leg portion is flat, the periphery of the hole of the sound absorbing material is caught by the clip seat when attaching the sound absorbing material, so that the work is smoothly performed. could not. Further, if the sound absorbing material is forcibly pushed while the peripheral edge of the hole is deeply caught in the clip seat, the sound absorbing material may be damaged.

  The present invention has been made in order to solve the above-described problem, and is a sound absorber mounting structure for a vehicle interior material, which includes a plate-like base material portion having a through hole, and a periphery of the through hole of the base material portion. A leg portion that protrudes from the back surface of the base material portion, and protrudes from the tip of the leg portion to the side of the through hole sideward, and when viewed from the axial direction of the through hole. And a head having a cone-shaped guide surface that tapers as it moves away from the base material portion, and the guide surface has a slit or hole in the sound absorbing material. The leg is inserted into the slit or hole of the sound absorbing material, and the surface of the sound absorbing material opposite to the base is engaged with the head. It is stopped.

According to the above configuration, when the sound absorbing material is positioned and pushed toward the vehicle interior material so that the slit or hole of the sound absorbing material substantially matches the guide surface of the head, the guide surface in which the slit or hole forms a cone shape. When it reaches the leg part past the head, it returns. Therefore, the work for attaching the sound absorbing material can be performed smoothly. In addition, since an excessive force is not applied to the sound absorbing material at the time of pressing, the damage can be prevented.
Further, since the head is disposed so as to be accommodated in the through hole when viewed from the axial direction of the through hole, the head and the base material are formed when the sound absorbing material mounting structure of the interior material is formed by injection molding or the like. There is no need for a slide mold for forming a space between the two parts, and the moldability is improved.

Preferably, the guide surface has a conical shape, a cross-sectional shape of the leg portion forms an arc, and the guide surface is continuous with an outer peripheral surface of the leg portion.
According to the said structure, the slit or hole of a sound-absorbing material can be guided more smoothly from the guide surface of a head to the outer peripheral surface of a leg part.

Preferably, the head has a locking projection protruding toward the base material on the opposite side of the leg.
According to the said structure, since a latching convex part pushes in a sound-absorbing material, the lateral shift of a sound-absorbing material can be prevented and a sound-absorbing material can be supported stably.

Preferably, a rib projecting from the back surface is formed on the base material portion in the vicinity of the leg portion.
According to the above configuration, the sound absorbing material is deformed by the rib in the direction opposite to the pressing direction of the head, so that the locking effect by the head can be enhanced and lateral displacement can also be prevented.

Preferably, a rib projecting from the back surface is formed on the base material portion in the vicinity of the leg portion, and the rib is disposed on the opposite side of the leg portion as viewed from the locking convex portion.
According to the above configuration, the sound absorbing material is deformed so as to draw an S shape by being pushed in from the opposite direction by the locking projection and the rib. Can be more reliably prevented.

  ADVANTAGE OF THE INVENTION According to this invention, while the workability | operativity at the time of attaching a sound absorption material to the vehicle interior material can be improved, the moldability of an attachment structure can be improved.

It is the perspective view which looked at the luggage compartment floor board 10 (vehicle interior material) which has the sound-absorbing-material attachment structure which concerns on one Embodiment of this invention from the back side (lower side). It is an expansion perspective view of the sound-absorbing material mounting structure. (A) And (B) is an expanded sectional view which shows in order the attachment process of the sound-absorbing material to the sound-absorbing material mounting structure. FIG. 5 is a cross-sectional view showing a mold shape particularly at a site where a sound absorbing material mounting structure is molded in the step of injection molding the cargo compartment floor plate 10. It is a principal part expanded bottom view of the cargo compartment floor board.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In this embodiment, the sound absorbing material 20 is attached to the back side (lower side; vehicle outer side) of the cargo compartment floor board 10 (vehicle interior material) of the automobile.

  The cargo floor 10 is made of resin such as polypropylene (PP) or filler-filled polypropylene (PPF), and has a rectangular shape with the vehicle width direction of the automobile as the longitudinal direction as shown in FIG. The cargo compartment floor board 10 has a plate-like base material portion 11 extending over substantially the entire area thereof.

  As shown in FIG. 1, the luggage compartment floor board 10 has a plurality of sound absorbing material mounting structures G in the form of dots on the back side thereof. As shown in FIG. 2, each sound absorbing material mounting structure G includes a base region 11 in a predetermined region, and a through hole 12 is formed in the base material 11 in the predetermined region.

Legs 13 are connected to the periphery of the through hole 12 of the base material part 11 and protrude from the back surface of the base material part 11. The leg 13 has an arc shape whose cross section is centered on the axis of the through hole 12 and is formed over about 130 degrees in this embodiment.
The leg portion 13 has a gradually decreasing arc diameter as it moves away from the base material portion 11, so that the longitudinal cross-sectional shape of the leg portion 13 increases as it moves away from the base material portion 11 as shown in FIG. It is gently inclined so as to approach the axis of the through hole 12.

  A hollow head 14 is connected to the tip of the leg 13. The head 14 protrudes laterally from the tip of the leg 13 toward the through hole 12 and is disposed so as to be accommodated in the through hole when viewed from the axial direction of the through hole 12.

The head portion 14 has a conical guide surface 14 a that tapers as it moves away from the base material portion 11. The guide surface 14a is continuous with the arc surface on the outer periphery of the leg 13.
The head 14 has a locking projection 14b formed on the opposite side of the leg 13 at the periphery. The locking convex part 14b protrudes toward the base material part 11, and the cross section has an arc shape and is formed over about 90 degrees. As shown in FIGS. 2 and 3, when viewed from the longitudinal direction of the cargo floor 10, the side of the head 14 is partitioned by a locking projection 14 b and a leg 13 and the through hole 12 side is open. A recessed portion 14c is formed.

  In all the sound-absorbing material mounting structures G, the leg portion 13 and the locking convex portion 14b face the same direction.

  On the back surface of the base material part 11, reinforcing ribs 16 having a lattice shape are formed over substantially the entire region. The legs 13 of each sound absorbing material mounting structure G are surrounded by these ribs 16. The leg portion 13 of the sound absorbing material mounting structure G shown in FIG. 2 is surrounded on all sides by four ribs 16. As shown in FIG. 3A, the rib 16 is higher than the tip of the locking projection 14b by ΔH.

  As shown in FIG. 1, a plurality of mounting boss portions 17 are formed in the form of dots on the back surface of the cargo floor 10 at a position away from the sound absorbing material mounting structure G. These mounting bosses 17 protrude higher than the head 14 of the sound absorbing material mounting structure G. A clip seat 17 a is formed at the tip of the mounting boss portion 17. As will be described later, the cargo floor plate 10 to which the sound absorbing material 20 has been attached is attached to the cargo compartment floor panel of the vehicle body via a clip attached to the clip seat 17a.

The cargo floor board 10 having the above structure is obtained by injection molding. Hereinafter, molding of the sound absorbing material mounting structure G will be described with reference to FIG.
The mold 30 has first and second molds 31 and 32. The first and second molds 31 and 32 have molding surfaces 31a and 32a that face each other. A molding convex portion 31 x is formed on the molding surface 31 a of the first mold 31. On the molding surface 32a of the second mold 32, a molding recess 32x that accommodates the molding projection 31x is formed. A concave portion 32y for molding the rib 16 is also formed on the molding surface 32a of the second mold.

  The base material portion 11 is molded by the resin supplied between the molding surfaces 31a and 32a in the clamped state, and the legs are formed by the resin supplied between the surface of the molding convex portion 31x and the surface of the molding concave portion 32x. The portion 13, the head portion 14, and the locking convex portion 14 b are formed, and the through hole 12 is formed by the root portion of the forming convex portion 31 x. Further, the rib 16 is formed by the resin supplied to the recess 32y.

By opening the first and second molds 31 and 32 after cooling and solidification of the molten resin, the sound absorbing material mounting structure G of the cargo floor 10 can be taken out.
As described above, the sound-absorbing material mounting structure G can be formed simply by clamping and opening the first and second molds 31 and 32 and sliding in a direction intersecting the mold clamping and mold opening directions. Therefore, the moldability can be improved.

Next, the sound absorbing material 20 will be described.
The sound absorbing material 20 is formed by laminating a plurality of fibers integrated into a sheet shape, and has flexibility. As shown in FIG. 3B, the sound absorbing material 20 is formed such that the thickness T is larger than the height H from the back surface of the base material portion 11 to the tip of the locking convex portion 14b. The sound absorbing material 20 is formed so that its planar shape can be accommodated in the cargo compartment floor board 10, and is superimposed on the back surface of the cargo compartment floor board 10 as shown in FIG.

  The sound absorbing material 20 is formed with a slit S that penetrates the sound absorbing material 20. The slit S is formed at the same time when the sound absorbing material 20 is punched out by the press machine, and corresponds to the position of the head 14 of the cargo floor 10. As shown in FIG. 5, in this embodiment, the visibility of the slit S is enhanced by forming the slit S in a waveform. The longitudinal direction of the slit S when the sound absorbing material 20 and the cargo compartment floor board 10 are viewed in plan is preferably formed so as to be parallel to the string connecting the ends of the arcs of the leg portions 13 having an arc shape.

Next, attachment of the sound absorbing material 20 to the luggage compartment floor plate 10 will be described.
The sound absorbing material 20 is positioned with respect to the cargo floor 10 by inserting a hole (not shown) formed in the sound absorbing material 20 into the mounting boss portion 17.

  When the sound absorbing material 20 is positioned with respect to the cargo floor 10, the slit S of the sound absorbing material 20 is positioned above the head 14 as shown in FIG. When the vicinity of the slit S of the sound absorbing material 20 is pushed toward the cargo compartment floor plate 10, the slit S is spread while sliding on the guide surface 14a of the head 14 having a conical shape. When further pushed in, the slit 14 is guided by the arc surface of the leg 13 connected to the guide surface 14a of the head 14, and reaches the leg 13 as shown in FIG.

  As described above, the work of attaching the sound absorbing material 20 can be improved by the guiding action of the guide surface 14a of the head 14, and the sound absorbing material 20 can be prevented from being caught by the head 14 and being damaged. .

  The slit S narrows again due to the elasticity of the sound absorbing material 20 when it passes over the head 14. When the leg portion 13 is inserted through the slit S in this way, the head portion 14 locks the surface of the sound absorbing material 20 on the opposite side of the base material portion 10, so that the sound absorbing material 20 does not come off and the cargo compartment floor plate. 10 is held.

In the present embodiment, the locking convex portion 14b of the head portion 14 pushes in the sound absorbing material 20 that is about to return to its original thickness due to elasticity, and the surface of the sound absorbing material 20 opposite to the base material portion 11 is the concave portion 14c. Since the sound absorbing material 20 is hooked by being pressed against the bottom of the sound absorbing material 20, the sound absorbing material 20 can be stably held.
Furthermore, since the rib 16 surrounding the leg portion 13 pushes the sound absorbing material 20 in the direction opposite to the pressing direction of the locking convex portion 14b, the lateral shift of the sound absorbing material 20 is prevented.
In particular, as shown in FIG. 3B, the rib 16 and the locking projection 14b arranged so as to face the leg 13 via the locking projection 14b cooperate to make the sound absorbing material 20 S-shaped. Therefore, a strong locking action is obtained, and the effect of preventing the lateral displacement of the sound absorbing material 20 can be further enhanced.

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.
In the above embodiment, the head is conical, but it may be pyramidal.
The slit S of the sound absorbing material 20 may be formed linearly. Further, instead of the slit S, a hole smaller than the head 14 may be formed.
The resin vehicle interior material having the sound absorbing material mounting structure of the present invention may be a pillar, a door trim, an instrument panel, or the like in addition to the cargo floor.
The sound absorbing material only needs to have flexibility, and felt, urethane, or the like may be used.

  The present invention can be applied to a sound absorbing material mounting structure for mounting a sound absorbing material to a vehicle interior material.

G Sound-absorbing material mounting structure 10 Cargo floor (board interior material)
DESCRIPTION OF SYMBOLS 11 Base part 12 Through-hole 13 Leg part 14 Head 14a Guide surface 14b Locking convex part 16 Rib 20 Sound-absorbing material S Slit

Claims (5)

A sound absorbing material mounting structure for a vehicle interior material,
A plate-like base material portion having a through hole; and
A leg part that is connected to a part of the periphery of the through hole of the base part and protrudes from the back surface of the base part,
A head that protrudes laterally from the tip of the leg to the side of the through-hole and that is disposed so as to fit within the through-hole when viewed from the axial direction of the through-hole;
The head has a conical guide surface that tapers as it moves away from the base material, and the guide surface guides the slit or hole of the sound absorbing material to the leg. An interior material for a vehicle, wherein a surface of the sound absorbing material opposite to the base material portion is locked to the head in a state where the leg portion is inserted into a slit or a hole of the sound absorbing material. Sound absorbing material mounting structure.   2. The vehicle interior according to claim 1, wherein the guide surface has a conical shape, a cross-sectional shape of the leg portion forms an arc, and the guide surface is continuous with an outer peripheral surface of the leg portion. Sound absorbing material mounting structure.   The sound absorbing material mounting structure for an interior material for a vehicle according to claim 1 or 2, wherein the head portion has a locking convex portion protruding toward the base material portion on the opposite side of the leg portion. .   The sound absorbing material mounting structure for a vehicle interior material according to any one of claims 1 to 3, wherein a rib projecting from the back surface is formed on the base material portion in the vicinity of the leg portion. In the vicinity of the leg part, the base part is formed with a rib protruding from the back surface,
The sound absorbing material mounting structure for a vehicle interior material according to claim 3, wherein the rib is disposed on the opposite side of the leg portion as viewed from the locking projection.

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