JP5104210B2 - Interior materials for vehicles - Google Patents

Description

  The present invention relates to a vehicle interior material that has both impact absorption performance and sound absorption performance.

  Conventionally, for the purpose of improving the quietness of a vehicle interior when the vehicle is running, a technique for absorbing noise that has entered the vehicle interior as well as blocking noise from entering the vehicle interior from outside the vehicle interior has been proposed. Yes. For example, Patent Document 1 discloses a sound absorbing structure in which a recess is formed on the vehicle interior side of a vehicle interior material such as a door trim and a sound absorbing material is embedded in the recess. According to the sound absorbing structure disclosed in Patent Document 1, it is possible to absorb the noise that has entered the vehicle interior with the sound absorbing material. Further, by attaching the sound absorbing material above the seat surface of the seat, it is possible to more effectively absorb the noise that has entered the vehicle interior.

JP 2006-160177 A

  In order to absorb noise that has entered the passenger compartment, it is known that it is effective to attach a sound absorbing material near the ears of the passenger seated in the seat. Therefore, it is conceivable to attach a sound absorbing material to a vehicle interior material near the passenger's ear, for example, a pillar garnish positioned on the side of the head of the passenger seated on the rear seat.

  FIG. 6 is a perspective view showing a state of the passenger compartment where the conventional pillar garnish 100 is attached. FIG. 7 is a perspective view showing a state of the back side of the pillar garnish 100.

  As shown in FIG. 6, the pillar garnish 100 is attached to the vehicle interior side of the rear pillar 102 of the vehicle. The pillar garnish 100 is located substantially on the side of the head of the occupant seated on the rear seat 104.

  As shown in FIG. 7, a plurality of shock absorbing ribs 106 are provided on the back side of the pillar garnish 100. The rib 106 absorbs the impact at the time of the secondary collision by deformation of the rib 106 when the head of the occupant has a secondary collision with the interior side surface of the pillar garnish 100 when the vehicle collides. It is provided to protect the occupant's head.

  When the sound absorbing material is attached to the pillar garnish 100, it is preferable that the sound absorbing material is attached to a portion closest to the occupant's ear seated on the rear seat 104 among all the portions of the pillar garnish 100. This is because when the sound absorbing material is attached to such a part, the noise absorbing performance of the sound absorbing material is more effectively exhibited.

  However, the ribs 106 described above are provided on the back side of the pillar garnish 100. Therefore, even if an attempt is made to attach the sound absorbing material to a part closest to the occupant's ear seated on the rear seat 104, a plurality of ribs 106 are already provided at that part. There was a problem that the sound absorbing material had to be attached at a position deviated from the optimum attachment position because the material could not be attached.

  Thus, in the conventional vehicle interior material (especially pillar garnish), since the shock absorbing rib 106 is provided near the occupant's ear seated on the rear seat 104, the sound absorbing material is provided near the occupant's ear. Could not be installed. For this reason, it has been difficult to realize an interior material for a vehicle having both impact absorption performance and sound absorption performance.

  This invention is made | formed in view of the above situations, Comprising: It aims at providing the interior material for vehicles which has the impact absorption performance and the sound absorption performance.

In order to solve the above problems, an interior material for a vehicle according to the present invention includes a base material composed of a plate-like member having a concave portion formed on a surface thereof, and a skin material is coated on the surface of the base material. And a cavity capable of absorbing sound is formed between the concave portion formed on the surface of the base material and the skin material, and the vehicle interior material is provided between the base material and the skin material. it you wherein the rigid holding members for holding the rigidity of the surface portion of the sandwiched.

According to the present invention, the cavity formed between the concave portion formed on the surface of the base material and the skin material functions as a sound absorbing resonator, so that sound absorbing performance is exhibited. In addition, when a passenger's head collides with the surface of the base material, the side walls of the recesses formed on the surface of the base material serve as conventional ribs, and the ribs are deformed to cause impact. Absorption performance is demonstrated. Thereby, the interior material for vehicles which has the impact absorption performance and the sound absorption performance can be realized.

Further, according to the present invention, the rigidity holding member for holding the rigidity of the surface portion of the vehicle interior material is sandwiched between the base material and the skin material. Therefore, even when the surface portion of the vehicle interior material is pressed with, for example, a finger, it is possible to prevent the occurrence of problems such as deterioration in appearance due to the depression of the surface portion.

Further, air permeability of the skin material can be made equal to or less than 8cc ^/ cm 2 · sec or more 200cc ^/ cm 2 · sec.

With such a configuration, since the surface of the base material is covered with the skin material, the concave portion formed on the surface of the base material can be hidden by the skin material. Therefore, it is possible to realize a vehicular interior material having a high design property. Moreover, in order to air permeability of the skin material is set to be no greater than 8cc ^/ cm 2 · sec or more 200cc ^/ cm 2 · sec, the sound absorbing performance of the cavity by the air permeability of the hollow portion from the skin material is maintained Can be maximized.

Moreover, the air permeability of the said rigid holding member shall be 200 cc / cm < ² > * sec or more .

With such a configuration, since the air permeability of the rigid holding member is set to 200 cc / cm ² · sec or more, the air permeability from the rigid holding member to the hollow portion is maintained, so that the sound absorption of the hollow portion is maintained. Almost no performance degradation.

Further , a sound absorbing material may be attached to the back surface of the base material .

With such a configuration , since the sound absorbing material is attached to the back surface of the base material, it is possible not only to absorb noise entering the vehicle interior, but also to block noise entering the vehicle interior from outside the vehicle interior. It is.

Moreover, the vehicle interior material of the present invention can be a pillar garnish attached to the vehicle interior side of the rear pillar of the vehicle .

With such a configuration, the pillar garnish is located near the ears of the occupant seated on the rear seat, so that the shock absorbing performance and the sound absorbing performance can be most effectively exhibited.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the vehicle interior material which has the impact absorption performance and the sound absorption performance.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the present embodiment, a pillar garnish that is a kind of vehicle interior material will be described as an example.

  FIG. 1 is a perspective view showing a state in a vehicle compartment to which a pillar garnish 10 is attached. As shown in FIG. 1, the pillar garnish 10 is attached to the vehicle interior side of the rear pillar 12 of the vehicle. The pillar garnish 10 is located approximately on the side of the head of an occupant seated on the rear seat 14.

FIG. 2 is an exploded perspective view of the pillar garnish 10. FIG. 3 is a cross-sectional view taken along line AA of the pillar garnish 10 shown in FIG.
As shown in FIGS. 2 and 3, the pillar garnish 10 includes a base material 16, a skin material 18, a rigid holding member 20, and a sound absorbing material 22.

  The base material 16 is comprised by the plate-shaped member shape | molded by injection molding, press molding, etc. Materials for the base material 16 include thermoplastic synthetic resins such as polypropylene resin (PP resin) and acrylonitrile butadiene styrene resin (ABS resin), thermosetting synthetic resins such as melamine resin, and binders such as synthetic resin mixed with wood fibers. The material etc. which were made can be used. The thickness of the base material 16 can be 1-10 mm, for example. The surface of the base material 16 is formed in an uneven shape over substantially the entire surface. The base material 16 formed in this concavo-convex shape is constituted by a substantially cubic concave portion 26 and a flat portion 28 formed between adjacent concave portions 26.

  As the material of the skin material 18, for example, woven fabric, non-woven fabric, knit, leather having a large number of minute ventilation holes, or the like can be used. A cushion material 19 made of foamed synthetic resin material (for example, urethane foam) or the like is attached to the back surface of the skin material 18 (see FIG. 3). By attaching the cushion material 19 to the back surface of the skin material 18, the feeling when the vehicle occupant touches the surface portion of the pillar garnish 10 is improved. The total thickness of the skin material 18 and the cushion material 19 can be set to 1 to 5 mm, for example.

In the present embodiment, the air permeability of the skin material 18 is set below 8cc ^/ cm 2 · sec or more 200cc ^/ cm 2 · sec. The “air permeability” used in the present specification is the air permeability according to the fragile method defined in JIS L 1096. “The air permeability of the skin material” means that when the cushion material 19 is attached to the back surface of the skin material 18 as in the present embodiment, the overall air permeability of the skin material 18 and the cushion material 19 combined. It points to that. On the other hand, when the cushion material 19 is not attached to the back surface of the skin material 18, the air permeability of only the skin material 18 is indicated.

FIG. 4 shows the measurement result of the sound absorption rate when the air permeability of the skin material 18 is changed. The sound absorption coefficient is measured according to JIS A 1405 “Measurement method of normal incidence sound absorption coefficient of building materials by pipe method”.
As shown in FIG. 4, while air permeability of up 0~8cc ^/ cm 2 · sec is the sound absorption coefficient increases rapidly, air permeability sound absorption rate is too not rise in a range of more than 8cc ^/ cm 2 · sec The high sound absorption rate is maintained. Therefore, the air permeability of the skin material 18 is preferably set to 8 cc / cm ² · sec or more.
On the other hand, when the air permeability of the skin material 18 exceeds 200 cc / cm ² · sec, the surface of the skin material 18 becomes rough, and the base material 16 and the rigid holding member 20 are seen through. Is not preferred. Therefore, the air permeability of the skin material 18 is preferably set to 200 cc / cm ² · sec or less.

  The rigid holding member 20 is made of, for example, punching metal, punching plastic, punching paper, wire mesh, or the like. The punching metal is a thin metal member having a large number of holes. Punched plastic is a thin plastic member with many holes. Punching paper is paper with a large number of holes. The thickness of the rigid holding member 20 can be set to 1 mm or less, for example.

In the present embodiment, the air permeability of the rigid retaining member 20 is preferably set to 200 cc / cm ² · sec or more. This is because, when the air permeability of the rigid retaining member 20 is 200 cc / cm ² · sec or more, there is almost no influence on the noise absorption performance by the cavity 30 described later, and the surface portion of the pillar garnish 10 is pointed at. This is because it is possible to ensure the necessary rigidity to the extent that the surface portion does not sink when it is pushed by, for example.

  The sound absorbing material 22 is made of a material having a sound absorbing effect. As a material of the sound absorbing material 22, for example, felt can be used. As the felt material, PET fiber, PP fiber, half-hair fiber, fiber material recovered from waste, or the like can be used.

  As shown in FIGS. 2 and 3, the surface of the base material 16 is covered with a skin material 18, and a sound absorbing material 22 is attached to the back surface of the base material 16. A rigid retaining member 20 is sandwiched between the base material 16 and the skin material 18. That is, the pillar garnish 10 is configured by laminating the skin material 18, the rigidity holding member 20, the base material 16, and the sound absorbing material 22.

  As shown in FIG. 3, a cavity 30 is formed between the recess 26 formed on the surface of the substrate 16 and the skin material 18. The hollow portion 30 functions as a resonator for absorbing noise in the vehicle interior.

  That is, noise that hits the surface of the pillar garnish 10 enters the inside of the cavity 30. Since the skin material 18 and the rigid holding member 20 have air permeability, noise in the vehicle compartment can pass through the skin material 18 and the rigid holding member 20 and enter the inside of the cavity 30. Then, noise (vibration energy of air) that has entered the inside of the cavity 30 is converted into frictional heat between the inner wall of the cavity 30 and the like. Thereby, the noise in the passenger compartment is converted into heat energy or the like inside the hollow portion 30 and absorbed.

A flat portion 28 is formed on the surface of the substrate 16. The flat portion 28 constitutes the surface of the pillar garnish. And the side wall which forms the recessed part 26 exhibits the function similar to the rib for shock absorption of the conventional pillar garnish.
That is, when a passenger's head or the like collides with the surface of the pillar garnish 10 at the time of a vehicle collision, the side wall of the concave portion 26 is deformed to absorb the impact at the time of the secondary collision. Thereby, it is possible to protect a passenger | crew's head from the impact at the time of a secondary collision, etc.

  On the other hand, a sound absorbing material 22 is attached to the back surface of the substrate 16. Therefore, the pillar garnish 10 can not only absorb the noise in the vehicle interior by the hollow portion 30, but can also block the noise entering the vehicle interior from the outside of the vehicle interior by the sound absorbing material 22. In addition, since the through-hole etc. are not provided in the base material 16, the noise which penetrate | invades into a vehicle interior from the vehicle interior can be interrupted | blocked effectively.

  According to the pillar garnish 10 of this embodiment, since the surface of the base material 16 is covered with the skin material 18, the uneven shape formed on the surface of the base material 16 can be hidden by the skin material 18. It is. Therefore, the pillar garnish 10 with high designability can be realized.

Further, the cavity by the air permeability of the skin material 18 is to be set below 8cc ^/ cm 2 · sec or more 200cc ^/ cm 2 · sec, it maintained breathable to the cavity portion 30 from the skin 18 It is possible to maximize the sound absorption performance of 30.

  Further, since the rigidity holding member 20 for holding the rigidity of the surface portion of the pillar garnish 10 is sandwiched between the base material 16 and the skin material 18, the surface portion of the pillar garnish 10 is pressed with, for example, a finger. Even if it is a case, generation | occurrence | production of malfunctions, such as a bad appearance, can be prevented because this surface part dents.

In addition, since the air permeability of the rigid holding member 20 is set to 200 cc / cm ² · sec or more, the air permeability from the rigid holding member 20 to the hollow portion 30 is maintained, so that the sound absorption performance is minimized. It is possible to suppress it.

  In addition, since the sound absorbing material 22 is attached to the back surface of the base material 16, not only the noise that has entered the vehicle interior can be absorbed, but also the noise intrusion from outside the vehicle interior to the vehicle interior can be blocked.

  Further, since the pillar garnish 10 is located near the ears of the occupant seated on the rear seat 14, the shock absorbing performance by the concave portion 26 formed on the surface of the base material 16 and the sound absorbing performance by the hollow portion 30. Can be effectively exhibited.

  In the examples, the noise level was measured when the pillar garnish of the present invention was installed in the vehicle interior. As a comparative example, the noise level was measured when a conventional pillar garnish without a sound absorbing cavity was installed in the passenger compartment. The noise level was measured by installing a microphone for collecting sound near the headrest in the rear seat when the vehicle was swept at a speed of 40 to 80 km / h. The measurement results are shown in FIG.

  As shown in FIG. 5, when the pillar garnish of the present invention was installed in the vehicle interior, the noise level in the vehicle interior as a whole was lower than when the conventional pillar garnish was installed. In particular, the noise level in the frequency region of 630 Hz or higher that requires sound absorption has decreased. This proved that the sound absorption effect of the pillar garnish of the present invention is higher than that of the conventional pillar garnish.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the pillar garnish is taken as an example of one of the vehicle interior materials, but the present invention is not limited to such an embodiment. The present invention can also be applied to other vehicle interior materials such as door trims, instrument panels, roof trims, deck boards, and package trays.
(2) In the above-described embodiment, the example in which the shape of the recess 26 is substantially cubic has been described, but the present invention is not limited to such an aspect. The shape of the recess 26 may be, for example, a substantially cylindrical shape.
(3) In the above embodiment, the example in which the recesses 26 are separated from each other has been described. However, the corners of the recesses 26 are adjacent to the corners of the other recesses 26, such as a so-called check pattern. You may make it a shape. Further, in this embodiment, a hollow portion is formed between the sound absorbing material 22 provided on the back surface of the base material and the concave portion formed on the back surface of the base material, and the hollow portion has a function as a resonator. Yes.

It is a perspective view which shows the state of the vehicle interior in which the pillar garnish is attached. It is a disassembled perspective view of a pillar garnish. It is AA sectional view taken on the line of the pillar garnish shown in FIG. The measurement result of the sound absorption rate when changing the air permeability of the skin material is shown. The measurement result of the noise level at the time of attaching the pillar garnish of this invention in a vehicle interior is shown. It is a perspective view which shows the state of the vehicle interior to which the conventional pillar garnish is attached. It is a perspective view which shows the state of the back surface of the conventional pillar garnish.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pillar garnish 12 ... Rear pillar 14 ... Rear seat 16 ... Base material 18 ... Skin material 19 ... Cushion material 20 ... Rigidity holding member 22 ... Sound absorbing material 26 ... Recess 28 ... Planar part 30 ... Hollow part

Claims (3)

It is provided with a base material composed of a plate-like member having a recess formed on the surface,
The surface of the base material is covered with a skin material,
A cavity capable of absorbing sound is formed between the recess formed on the surface of the base material and the skin material,
Between the base material and the skin material, a rigidity holding member for holding the rigidity of the surface portion of the vehicle interior material is sandwiched ,
Air permeability of the skin material is a 8cc ^/ cm 2 · sec or more 200cc ^/ cm 2 · sec or less,
The air permeability of the rigid holding member is 200 cc / cm ² · sec or more,
The interior material for a vehicle , wherein the concave portion has a side wall portion capable of absorbing an impact by being deformed at the time of a vehicle collision . The vehicle interior material according to claim 1,
An interior material for a vehicle, wherein a sound absorbing material is attached to the back surface of the base material. The vehicle interior material according to claim 1 or 2,
An interior material for a vehicle which is a pillar garnish attached to a vehicle interior side of a rear pillar of the vehicle .

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