JP2014069702A - Trim for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fender protector being capable of effective sound absorption and easy control of frequencies of sounds to be absorbed.SOLUTION: A body part 21 covering a part of a vehicle body is provided. A space part 38 communicating with outside air through a communication hole 37 is partitioned between the body part 21 and a space part forming member 22 by attaching the space part forming member 22 formed with the communication hole 37 to the body part 21. A sheet-like sound absorption material 23 is arranged in such a way as to be at least partially located in the space part 38.

Description

  The present invention relates to a vehicle trim that covers a part of a vehicle body.

  2. Description of the Related Art Conventionally, a fender protector is known that is attached to a fender panel of a vehicle such as an automobile and covers an upper portion of the tire and protects other parts of the vehicle body from mud, pebbles, and the like that are lifted by the tire. As such a fender protector, unpleasant noise such as engine (motor) noise, booming noise, pattern noise, road noise, chipping sound caused by collision with earth or sand or pebbles, or splash sound caused by collision of splashed water, etc. A device that absorbs noise of a frequency and improves the quietness of the passenger compartment is known.

  For example, a fender protector including a base material layer having a sound absorbing effect is known. In this base material layer, a water-resistant protective film made of LDPE (low density polyethylene) resin is integrally provided on a sheet made of a fiber web entangled with a main fiber and a binder fiber having a melting point lower than that of the main fiber. After that, the fender protector is three-dimensionally formed by hot press molding (see, for example, Patent Document 1).

  Further, by arranging a sheet-like sound absorbing material across the rib provided on the back surface of the fender protector, and configuring the space surrounded by the back surface of the fender protector and the rib and the sound absorbing material as a closed sound absorbing chamber, Abnormal noise is absorbed by the sound-absorbing material and the sound-absorbing chamber (see, for example, Patent Document 2).

Japanese Patent Laying-Open No. 2011-240821 (page 4-10, FIG. 1-4) Japanese Patent Laying-Open No. 2010-6313 (page 6-10, FIG. 1-5)

  In general, since the frequency at which sound absorption is desired differs from vehicle to vehicle, it is required to be able to tune the frequency at which sound is absorbed by the fender protector.

  However, in the case of the configuration described in Patent Document 1, the sound absorption is determined by the characteristics of the main fiber binder fiber and the thickness of the base material layer. Therefore, the material is reselected every time the frequency capable of sound absorption is changed. In addition to the necessity, a water-resistant protective film is integrally provided on the base material layer, and further, hot press molding is required, and the manufacturing becomes complicated.

  Further, for example, even in the case of the configuration described in Patent Document 2, it is necessary to use different materials for the sound absorbing material in order to change the frequency at which sound can be absorbed.

  The present invention has been made in view of these points, and an object of the present invention is to provide a vehicle trim that can effectively absorb sound and can easily control the frequency of sound absorption.

  The vehicle trim according to claim 1 is provided with a main body part that covers a part of the vehicle body and a communication hole, and is attached to the main body part so as to communicate with outside air through the communication hole. And a sheet-like porous material at least partially located in the space.

  A vehicle trim according to a second aspect is the vehicle trim according to the first aspect, wherein the porous material is filled in the space.

  A vehicle trim according to a third aspect is the vehicle trim according to the first or second aspect, wherein a locking claw provided in at least one of the main body and the space forming member, the main body, And a latch receiving portion that is provided on the other side of the space portion forming member and receives the latching claw portion.

  According to the vehicle trim of the first aspect, the space portion communicating with the outside air is defined between the main body portion and the space portion forming member attached to the main body portion by the communication hole provided in the space portion forming member. By disposing a sheet-like porous material located in at least a part of this space portion, the sound absorption effect by the space portion and the communication hole partitioned by the space portion forming member, and the sound absorption effect by the porous material The synergistic action enables effective sound absorption, and the sound-absorbing frequency includes the space forming member and the thickness of the space, the diameter of the communication hole, the opening ratio of the communication hole, and the porous material. It can be easily controlled based on the sound absorption characteristics.

  According to the vehicle trim according to the second aspect, in addition to the effect of the vehicle trim according to the first aspect, the frequency at which sound can be absorbed can be controlled more easily by filling the space with the porous material.

  According to the vehicle trim according to claim 3, in addition to the effect of the vehicle trim according to claim 1 or 2, the locking claw provided in at least one of the main body and the space forming member is The space part forming member can be more easily attached to the main body part by receiving the locking part provided on the other of the part and the space part forming member.

It is sectional drawing which shows 1st Embodiment of the trim for vehicles of this invention. It is a perspective view which shows the trim for vehicles same as the above. It is a side view which shows a part of vehicle body which attached the trim for vehicles same as the above. It is a graph which shows the sound absorption characteristic of a vehicle trim same as the above. It is a perspective view which shows 2nd Embodiment of the trim for vehicles of this invention. It is a perspective view which shows 3rd Embodiment of the trim for vehicles of this invention. It is sectional drawing which shows 4th Embodiment of the trim for vehicles of this invention. It is sectional drawing which shows 5th Embodiment of the trim for vehicles of this invention. It is sectional drawing which shows 6th Embodiment of the trim for vehicles of this invention.

  A vehicle trim according to a first embodiment of the present invention will be described below with reference to the drawings.

  1 to 3, reference numeral 10 denotes a vehicle body constituting a vehicle. The vehicle body 10 includes a bumper portion 11 located at a front end portion and a fender portion 12 continuous to the rear side of the bumper portion 11. Yes. And, located on the side of the front engine room, a front wheel house 15 as a mounted part is constituted by being surrounded by the bumper part 11 and the fender part 12, and this wheel house 15 A tire 16 is disposed as a wheel. The wheel house 15 is provided with a fender protector 17 that is an exterior material for a vehicle as a vehicle trim, facing the outer peripheral surface of the tire 16, that is, covering the rear from the front of the tire 16 through the upper part, It is attached to the vehicle body 10. Hereinafter, directions such as front and rear, up and down, left and right will be described with reference to the straight traveling direction of the vehicle body 10, arrow F indicates the front and arrow W indicates the lateral direction of the vehicle. Hereinafter, in order to make the description clearer, the fender protector 17 that covers the tire 16 of the front wheel on one side (left side) of the vehicle body 10 will be described. When used as a fender protector that covers the front wheel tire 16 on the other side (right side) of the vehicle body 10, a fender protector 17 described below may be basically inverted with respect to the vehicle width direction.

  The fender protector 17 is also referred to as an inner fender or the like. For example, the main body portion 21 formed of synthetic resin, the space portion forming member 22 attached and locked to the main body portion 21, and these main body portions. And a sound absorbing material 23, which is a sheet-like porous material, disposed between the space 21 and the space forming member 22.

  The main body portion 21 is bent from the front end portion of the curved portion 24 that is substantially semicircular or substantially U-shaped (substantially inverted U-shaped) when viewed from the side facing the tire 16, and extends substantially horizontally. A front side mounting portion 25 that is one flange portion as a flange portion that is also referred to as a lower surface, and a rear side mounting that is the other flange portion of a flat plate extending substantially horizontally from the rear end portion of the curved portion 24 The unit 26 and the like are integrally provided.

Further, the space portion forming member 22 is a sound absorbing structure integrally formed of, for example, a synthetic resin. The upper plate portion 31 as a facing portion facing the main body portion 21 and the outer edge portion of the upper plate portion 31 downward. And a side plate portion 32 that is lowered, and a locking receiving portion 33 that is an outer edge portion that protrudes outwardly from the lower end portion of the side plate portion 32 in a flange shape. Accordingly, the space forming member 22 is partitioned by a concave portion 34 surrounded by the upper plate portion 31 and the side plate portion 32 and recessed upward. Further, the space portion forming member 22 (upper plate portion 31) is formed in a substantially quadrangular shape that is long in the vehicle width direction, and interferes with the main body portion 21 side on one side of the central portion in the longitudinal direction. A cutout 35 for avoiding this is formed. Further, the upper plate portion 31 of the space portion forming member 22 is formed in a flat plate shape having a predetermined thickness (plate thickness) T1, and a plurality of communication holes 37 having a round hole shape set to a predetermined diameter dimension d. Are arranged in a two-dimensional manner such as a matrix or a staggered pattern at a predetermined pitch. The space portion forming member 22 is fixed to an upper portion of the bending portion 24 of the main body portion 21 with the concave portion 34 facing the main body portion 21 (curving portion 24). 24), a space 38 having a predetermined thickness T2 is defined. Therefore, the space portion 38 communicates with the outside air through each communication hole 37, and the communication hole 37 and the space portion 38 constitute a so-called Helmholtz type resonance sound absorbing device 39. Here, the thickness T2 of the space portion 38 is the depth dimension of the recess 34 of the space portion forming member 22 and the thickness of the outer edge portion 23a of the sound absorbing material 23 sandwiched between the main body portion 21 and the space portion forming member 22. Is defined as the sum of The sound absorption characteristic of the resonance sound absorbing device 39 is a curve having a peak at a predetermined resonance frequency f ₀ (α1 in FIG. 4). The resonance frequency f ₀ is the sound velocity c (m / s ² ), the aperture ratio of the space portion forming member 22 P (= ((area per one communication hole 37) · number of communication holes 37). / (Area of the upper plate portion 31)), it is obtained by f ₀ = c / 2π · √ (P / ((T1 + 0.8d) · T2)).

  The space portion forming member 22 can be fixed to the main body portion 21 by any method that usually joins synthetic resins, such as adhesive, double-sided tape, ultrasonic welding, or vibration welding. In the present embodiment, the locking receiving portion 33 is locked and fixed to a plurality of locking claw portions 41 protruding from the upper portion of the main body portion 21 (curved portion 24). These latching claw portions 41 are provided with claw portions 41a protruding toward the space portion forming member 22 side, and are formed on the space portion forming member 22 side and the opposite space portion forming member 22 side so as to be elastically deformable.

Further, the sound absorbing material 23 is a soft sheet having a predetermined constant thickness T3, for example, a non-woven fabric such as felt or Synsalate (registered trademark) having a number of fine air chambers (holes) communicating with the outside. It has become. Further, the sound absorbing material 23 is positioned inside the space portion 38 with the outer edge portion 23a sandwiched between the upper portion of the main body portion 21 (curved portion 24) and the locking receiving portion 33 of the space portion forming member 22, for example. doing. That is, the sound absorbing material 23 covers the entire bottom portion of the space portion 38 without a gap. In the present embodiment, the thickness T3 is set to be smaller than the thickness T2 of the space portion 38, and the upper portion of the sound absorbing material 23 and the space portion An air layer portion 43 is formed between the forming member 22 and the air. The sound absorbing material 23 absorbs sound in a high frequency band higher than the resonance frequency f ₀ of the sound absorbing characteristic (α 1 in FIG. 4) of the resonance sound absorbing device 39 (α 2 in FIG. 4).

  And the space part formation member which made the recessed part 34 face the lower part (main part 21) in the state which has arrange | positioned the sound-absorbing material 23 in the position between the latching claw parts 41 in the upper part of the main part 21 (curved part 24) When the latch receiving portion 33 of the space portion forming member 22 elastically deforms the latching claw portion 41 outward by pushing the 22 from the upper side to the lower side of the main body portion 21, the claw portion 41a is overcome. When the locking claw portion 41 is restored and deformed, the claw portion 41a engages with the locking receiving portion 33 and can be easily attached to the main body portion 21 with one touch. In this state, the space portion 38 is partitioned between the main body portion 21 (curved portion 24) and the space portion forming member 22, and the outer edge portion 23a of the sound absorbing material 23 is connected to the upper portion of the main body portion 21 (curved portion 24). The sound absorbing material 23 is sandwiched between the locking receiving portion 33 and fixed in a state where the sound absorbing material 23 is positioned in the space portion 38.

  In this way, the fender protector 17 in which the space portion forming member 22 (resonance sound absorbing device 39) and the sound absorbing material 23 are attached to the main body portion 21 is attached to the vehicle body 10 by using a fitting such as a rivet (not shown) or by fitting. Assembled. At this time, for example, the curved portion 24 is fixed to the fender portion 12, the front mounting portion 25 is fixed to a wind guide plate (not shown), which is a separate fixing member, for example, located in the bumper portion 11, and the rear mounting portion 26 is For example, it is fixed to the lower surface of the vehicle body 10. Therefore, the space forming member 22 (resonance sound absorbing device 39) and the sound absorbing material 23 are covered with the fender protector 17 and are hidden behind the fender protector 17.

Then, in the fender protector 17, the synergistic effect of the resonance sound absorber 39 and the sound absorbing material 23, the resonance sound absorption device 39 of the resonance frequency f ₀ lower than the resonance frequency f (e.g. 1000 Hz), the attenuation at the resonance frequency f ₀ The sound absorption characteristic has a peak larger than the rate (α3 in FIG. 4). That is, the sound absorption characteristic of the fender protector 17 is not a simple addition of the sound absorption characteristic of the resonance sound absorbing device 39 and the sound absorption characteristic of the sound absorbing material 23, but is a synergistic sound absorption characteristic.

  That is, effective sound absorption is achieved by a synergistic action of the sound absorption effect by the resonance sound absorbing device 39 formed by the space portion 38 and the communication hole 37 partitioned by the space portion forming member 22 and the sound absorption effect by the sound absorbing material 23. For example, it is possible to absorb unpleasant frequency noises such as engine noise, road noise, and chipping noise, and to improve the quietness of the vehicle interior. 22 (upper plate portion 31) and the thickness T1, T2 of the space portion 38, the diameter d of the communication hole 37, the opening ratio of the communication hole 37, and the sound absorption characteristics of the sound absorbing material 23 can be easily controlled. It can be easily adjusted so as to absorb sound in a specific frequency range.

  Further, the fender protector 17 can be easily manufactured because it can obtain a sound absorbing effect by attaching the space forming member 22 and the sound absorbing material 23 formed separately, without making a major design change to the main body 21. .

  In addition, the space portion forming member 22 may be formed in a box shape provided with the communication holes 37, so that it does not have a complicated shape that causes, for example, an undercut, and can be easily formed by injection molding.

  Further, by receiving the locking claw portion 41 provided on the main body portion 21 by the locking receiving portion 33 provided on the space portion forming member 22, the space portion forming member 22 can be more easily attached to the main body portion 21. it can.

  Furthermore, since the space forming member 22 and the sound absorbing material 23 also function as an impact absorber, an impact absorbing effect can be obtained by arranging the space forming member 22 and the sound absorbing material 23.

  Next, a second embodiment will be described with reference to FIG. In addition, about the structure similar to the said 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the second embodiment, the space portion forming member 22 and the sound absorbing material 23 are used for a back door trim 45 which is a vehicle interior material as a vehicle trim.

  The back door trim 45 is attached to the passenger compartment side at a position below the back door glass of a back door (not shown) as a mounted portion of the vehicle body 10, and is formed of, for example, a synthetic resin, for example, a vehicle width. A flat plate-like main body 47 extending longitudinally in the direction, an upper protrusion 48 protruding rearward from the upper edge of the main body 47, and protruding rearward from both side edges of the main body 47. The side protrusions 49 and 49 and a lower protrusion 50 protruding rearward from the lower edge of the main body 47 are integrally provided, and the space portion forming member 22 and the sound absorbing material 23 are provided at the rear of the main body 47. It is attached.

  The space portion forming member 22 (upper plate portion 31) is formed in, for example, a rectangular shape that is long in the vehicle width direction, and a plurality of the space portion forming members 22 (upper plate portions 31) are arranged at positions closer to the lower side of the main body portion 47 in the vehicle width direction. The sound absorbing material 23 is disposed in each space portion 38 formed between each of the space portion forming members 22 and the main body portion 47.

  The back door trim 45 accommodates the space portion forming member 22 (resonance sound absorbing device 39) and the sound absorbing material 23 between the back door, that is, the space portion forming member 22 (resonance sound absorbing device 39) and the sound absorbing material. It can be attached to the back door with screws, etc. with 23 facing away from the passenger compartment (rear). Accordingly, the space forming member 22 (resonance sound absorbing device 39) and the sound absorbing material 23 are covered with the back door trim 45 and are hidden behind the back door trim 45.

  The back door trim 45 has a space portion 38 communicating with outside air through a communication hole 37 provided in the space portion forming member 22 between the main body portion 47 and the space portion forming member 22 attached to the main body portion 47. By partitioning and arranging the sheet-like sound absorbing material 23 positioned in the space 38, the sound absorbing effect by the space 38 and the communication hole 37 (resonance sound absorbing device 39) partitioned by the space forming member 22, Synergistic action with the sound absorbing effect of the sound absorbing material 23 enables effective sound absorption, for example, can absorb unpleasant frequency noise such as road noise, and improve the quietness of the passenger compartment. The sound absorbing frequency can be easily controlled based on the thickness of the space forming member 22 and the space 38, the diameter of the communication hole 37, the opening ratio of the communication hole 37, and the sound absorption characteristics of the sound absorbing material 23. Absorbs the target specific frequency range. It can be easily adjusted to.

  Next, a third embodiment will be described with reference to FIG. In addition, about the structure similar to said each embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the third embodiment, the space portion forming member 22 and the sound absorbing material 23 are used for an engine undercover 52 which is a vehicle exterior material as a vehicle trim.

  The engine under cover 52 is attached so as to cover a lower portion of an engine room (not shown) of the vehicle body 10, and is formed of, for example, a synthetic resin, and extends, for example, in a longitudinal direction in the vehicle width direction. A front flange portion 55 that protrudes in a flange shape from the front portion of the portion 54 toward the front, and side flange portions 56 and 56 that protrude in a flange shape from both side edges of the main body portion 54 to the sides; A rear flange portion 57 projecting in a flange shape from the rear portion of the main body portion 54 toward the rear is integrally provided, and the space portion forming member 22 and the sound absorbing material 23 are attached to the upper portion of the main body portion 54.

  In the main body portion 54, a stepped portion 58 is formed in a longitudinal shape along the vehicle width direction at an intermediate position in the front-rear direction. The stepped portion 58 is inclined downward from the front side to the rear side. The space portion forming member 22 (upper plate portion 31) is formed in a substantially rectangular shape that is long in the vehicle width direction. For example, a notch portion corresponding to the shape of the outer edge portion of the main body portion 54 is formed on a part of the rear side. 59 is continuously cut out on one side. Further, the space forming member 22 is disposed across the stepped portion 58. Therefore, since the thickness T2 of the space portion 38 is different between the upper portion and the lower portion of the step portion 58, in the present embodiment, the upper plate portion 31 and the main body portion 54 of the space portion forming member 22 The thickness T2 of the space 38 is defined as the average value of the distances between the two.

  The engine under cover 52 is attached to the vehicle body 10 by rivets or bolts with the space portion forming member 22 (resonance sound absorbing device 39) and the sound absorbing material 23 facing the engine room (upward). Accordingly, the space forming member 22 (resonance sound absorbing device 39) and the sound absorbing material 23 are covered with the engine under cover 52 and are hidden behind the engine under cover 52.

  The engine under cover 52 has a space 38 that communicates with the outside air through a communication hole 37 provided in the space portion forming member 22 between the main body portion 54 and the space portion forming member 22 attached to the main body portion 54. The sound absorbing effect by the space 38 and the communication hole 37 (resonant sound absorbing device 39) partitioned by the space forming member 22 is obtained by arranging the sheet-like sound absorbing material 23 in the space 38. By synergistic action with the sound absorption effect by the sound absorbing material 23, effective sound absorption is possible, for example, noise of unpleasant frequencies such as engine sound, road noise and chipping sound can be absorbed, and the quietness in the passenger compartment The frequency capable of sound absorption depends on the thickness of the space portion forming member 22 and the space portion 38, the diameter of the communication hole 37, the opening ratio of the communication hole 37, and the sound absorption characteristics of the sound absorbing material 23. Because it can be easily controlled based on A specific range of a target frequency can be easily adjusted to sound absorption.

  Next, a fourth embodiment will be described with reference to FIG. In addition, about the structure similar to said each embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the fourth embodiment, the thickness T3 of the sound absorbing material 23 of each of the above embodiments is the same as the thickness T2 of the space 38. That is, in the present embodiment, the sound absorbing material 23 is filled in the space portion 38 without a gap. For this reason, the air layer portion 43 is not formed above the sound absorbing material 23 in the space portion 38.

  And by comprising in this way, the frequency which absorbs sound can be controlled more easily.

  In each of the above embodiments, the recess 34 may be provided in at least one of the main body 21 and the space forming member 22. For example, as in the fifth embodiment shown in FIG. 8, the concave portion 34 may be provided in the main body portion 21 (main body portions 47 and 54). Also in this case, the same effects as those of the above embodiments can be obtained.

  Further, in the fifth embodiment, as in the sixth embodiment shown in FIG. 9, the thickness T3 of the sound absorbing material 23 is the same as the thickness T2 of the space portion 38 and the sound absorbing material 23 is changed to the space portion 38. It is possible to fill the gap without any gap and to control the frequency of sound absorption more easily.

  Further, in each of the above embodiments, the locking claw portion may be provided on at least one of the main body portion 21 and the space portion forming member 22. In this case, the latch receiving portion is provided on the other side of the main body portion 21 and the space portion forming member 22, and the main body portion 21 and the space portion forming member 22 are received by receiving the locking claw portion by the lock receiving portion. Can be fixed to each other.

  In addition to the fender protector 17, the back door trim 45, or the engine under cover 52, the vehicle trim including the space forming member 22 and the sound absorbing material 23 is, for example, a garnish that decorates the pillar of the vehicle compartment, or the engine room. Any vehicle exterior material or vehicle interior material such as a dash lower panel disposed between the vehicle and the passenger compartment can be used.

  The present invention is suitably used for, for example, a fender protector disposed in a wheel house of a front wheel of an automobile.

10 body
17 Fender protector as a vehicle trim
21, 47, 54 Body
22 Space forming member
23 Sound absorbing material that is a porous material
33 Locking receiving part
37 Communication hole
38 Space
41 Locking claw
45 Back door trim as a vehicle trim
52 Engine undercover as a vehicle trim

Claims (3)

A body part covering a part of the vehicle body;
A space portion forming member that includes a communication hole, and that is attached to the main body portion so as to partition a space portion that communicates with outside air through the communication hole between the main body portion,
A vehicle trim, comprising: a sheet-like porous material at least a part of which is located in the space portion. The vehicle trim according to claim 1, wherein the porous material is filled in the space. A locking claw provided on at least one of the main body and the space forming member;
The vehicle trim according to claim 1, further comprising: a locking receiving portion that is provided on the other of the main body portion and the space forming member and receives the locking claw portion.

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