JP2006205911A - Sound absorbing device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound absorbing device for a vehicle, having excellent sound absorbing efficiency, and capable of preventing freezing of a sound absorbing means and a road surface even if water enters. <P>SOLUTION: The sound absorbing device for the vehicle comprises a sound absorbing material 5, and a draining means draining water absorbed by the sound absorbing material 5. A skin material 9 provided on a road surface side of a vehicle body, and a wire 8 penetrating the sound absorbing material 5 interposed between the skin material and a floor panel 3 are provided. The wire 8 is connected to a parking brake. When the parking brake is actuated, the wire 8 pulls up the skin material 9 to a vehicular height direction upper side by interlocking with the parking brake, and compresses the sound absorbing material 5 to drain the water. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle sound absorbing device that reduces traffic noise reaching a passenger compartment.

  When the vehicle travels, sound is emitted from the tires and the like, and reflection is repeated between the vehicle floor panel and the road surface, so that measures to reduce traffic noise have been conventionally taken. There are two ways to reduce traffic noise: a method to reduce the source itself and a method to reduce the reflection by absorbing the generated sound. As a method for reducing the reflection, there is a sound absorbing means for absorbing the sound in the lower part of the floor panel or the wheel house. May be placed.

  A sound absorbing device comprising a flat substrate and a sound absorbing material facing the substrate as sound absorbing means for reducing reflection, and further comprising a partition plate that divides an air layer between the substrate and the sound absorbing material into a plurality of lattice-like cells. Is known (for example, see Patent Document 1). The sound absorbing device can effectively attenuate the sound by setting the depth of each cell to about ¼ of the wavelength of the sound to be absorbed.

As a sound absorbing means for reducing reflection, a sound absorbing body in which a fiber-based sound absorbing material is packed inside a perforated plate and arranged at the bottom of a floor panel is known (for example, see Patent Document 2). The sound absorber absorbs the sound radiated from the tire by the fiber-based sound absorbing material, and warps the opening of the perforated plate so that the warped portion covers a corresponding portion of the opening, and the water to the sound absorbing material is absorbed. It tries to prevent intrusion.
JP 2004-170665 A Japanese Patent Laid-Open No. 6-298014

  However, since the depth of the cell structure is determined according to the sound to be absorbed in the sound absorbing device described in Patent Document 1, a space in which the cell structure having a depth for absorbing the sound radiated from the tire is disposed at the lower portion of the floor panel. It is often difficult to ensure

  In addition, since the sound absorber described in Patent Document 2 has an opening, it is difficult to prevent water from entering, and the sound absorber absorbs water by running on snowy roads or running on rainy weather. If the amount of absorbed water exceeds a certain amount, it will drip, but in winter and cold areas, if water drops after parking the vehicle, the water may freeze to connect the road surface to the sound absorber. . If the vehicle is started while the road surface and the sound absorber are frozen together, the sound absorber and the like may be damaged. Further, when water enters the sound absorbing body, the sound absorbing material gradually deteriorates and the sound absorbing performance may be lowered.

  Therefore, it is desirable that water does not enter the sound absorbing means having the fiber-based sound absorber, but there is a problem that it is difficult to design the sound absorbing means that prevents water from entering and efficiently absorbs sound.

  In view of the above problems, an object of the present invention is to provide a vehicle sound absorbing device that has excellent sound absorbing efficiency and can prevent freezing between the sound absorbing means and the road surface even when water enters.

  In order to solve the above problem, the present invention provides a vehicle sound absorbing device comprising a sound absorbing material and a discharging means for discharging water absorbed by the sound absorbing material.

  According to the vehicle sound absorbing device of the present invention, the sound absorbing efficiency is excellent and the freezing of the sound absorbing means and the road surface can be prevented even if water enters.

  Moreover, in one form of the vehicle sound absorbing device of the present invention, the discharging means squeezes the sound absorbing material and discharges water. According to the present invention, the water absorbed by the sound absorbing material can be squeezed and discharged.

  In the vehicle sound absorbing device of the present invention, the discharging means discharges water in conjunction with a parking brake of the vehicle. According to the present invention, when the parking brake is operated, the vehicle sound absorbing device can discharge water from the sound absorbing material.

  In one form of the vehicle sound absorbing device of the present invention, the discharging means includes a skin material provided on the road surface side of the vehicle body, the skin material, and a sound absorbing material interposed between the skin material and the vehicle body. When the wire is pulled upward in the vehicle height direction, the skin material compresses the sound absorbing material and discharges water from the sound absorbing material.

  According to the present invention, since the skin material compresses the sound absorbing material by pulling the wire, water can be discharged from the sound absorbing material.

  Moreover, in one form of the vehicle sound absorbing device of the present invention, the wire is connected to a parking brake. According to the present invention, since the wire is connected to the parking brake, water can be discharged from the sound absorbing material in conjunction with the operation of the parking brake.

  In one embodiment of the sound absorbing device for a vehicle according to the present invention, the sound absorbing material is disposed on a road surface side of a floor panel, a wheel house, an engine room, or a trunk room. ADVANTAGE OF THE INVENTION According to this invention, the sound which repeats reflection between a road surface and a vehicle can be absorbed by arrange | positioning a sound-absorbing material to a floor panel etc. Note that the vehicle sound absorbing device may be disposed in any part of the vehicle body, such as inside the door.

  It is possible to provide a vehicle sound absorbing device that has excellent sound absorbing efficiency and can prevent freezing between the sound absorbing means and the road surface even when water enters.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view of a vehicle in which a vehicle sound absorbing device 1 according to the present embodiment is disposed on a floor panel 3. FIG. 1A is a plan view of the vehicle, and FIG. 1B is a side view of the vehicle. In FIG. 1, one vehicle sound absorbing device 1 is disposed on the floor panel, but it is preferable that one or more vehicle sound absorbing devices 1 be disposed in accordance with the shape of the floor panel 3.

  The vehicle sound absorber 1 arranged as shown in FIG. 1 (a) or (b) absorbs the sound emitted by the tire 2 rotating on the road surface, the sound emitted from the engine or the transmission, etc., and reflected from the road surface. Reduce the number of times that the vehicle reaches the car. In addition, the vehicle sound absorbing device 1 arranged as shown in FIG. 1A or 1B is in contact with the water that the tire 2 springs up when running on rainy weather or running on a snowy road. The fiber-based sound absorbing material possessed by the water absorbs water.

  In FIGS. 1A and 1B, the vehicle sound absorbing device 1 is disposed on the floor panel 3, but the vehicle sound absorbing device 1 may be disposed in any part of the vehicle. For example, as shown in FIG. 1C, it may be disposed in the wheel house 14 or may be disposed on the road surface side of the engine room 15 or the trunk room 16.

  2A is an example of a cross-sectional view taken along line AA in FIG. 1A. FIG. 2B is a plan view of the vehicle sound absorbing device 1 in the vehicle width direction left portion 20 in FIG. Each is shown. In FIG. 2B, the floor panel 3 is omitted, and the sound absorbing material 5 and the skin material 9 have the same size.

  The vehicle sound absorbing device 1 is disposed between the road surface 10 and the floor panel 3. The vehicle sound absorbing device 1 is configured to include a sound absorbing material 5, a skin material 9, a wire 8, a pulley 6, a fastener 7, and a base material 4.

  A sound absorbing material 5 is disposed on the road surface side of the floor panel 3, and the sound absorbing material 5 is interposed between the skin material 9 and the floor panel 3. The skin material 9 is held on the vehicle by the base material 4. The base material 4 is fixed to the floor panel 3 with bolts or the like, and has one or more water outlets 11 in a holding portion 4 a that holds the skin material 9.

  The base material 4 has an opening 4b so that the skin material 9 faces substantially parallel to the road surface, and the skin material 9 is placed so that the end 9a of the skin material 9 overlaps the holding part 4a of the base material 4. keeping. That is, the area of the skin material 9 is larger than the area of the opening 4b, and the end portion 9a of the skin material 9 can swing by overlapping the end portion 9a of the skin material 9 and the holding portion 4a of the base material 4. The substrate 4 is held in a state.

  The wire 8 passes through the floor panel 3, the sound absorbing material 5 and the skin material 9, and is connected to a fastener 7 provided outside the skin material 9. The wire 8 is connected to predetermined wire pulling means via the pulley 6.

  The sound absorbing material 5 is made of, for example, a fiber material such as felt or glass wool. The sound-absorbing material is preferably one that efficiently absorbs sound, but may be a fiber, that is, a thin thread-like substance, whether it is woven or non-woven, or a mixture thereof. Also good. The surface of the fiber may be subjected to a water repellent treatment, and the fiber material may be a synthetic polymer compound such as polyester, acrylic or vinyl, carbon fiber, ceramic fiber or the like.

  The thickness of the sound-absorbing material 5 is designed so that it will not be damaged even if the vehicle climbs over a step or the like during traveling, and the sound to be absorbed can be absorbed sufficiently. For example, when absorbing a sound of 1 kHz, the thickness of the sound absorbing material 5 is about 10 mm to 20 mm. Since the thickness of the fiber-based sound absorbing material 5 can be reduced as compared with the sound absorbing device in which the air layer is divided into a plurality of lattice-like cells, the sound emitted from the tire or the like can be absorbed efficiently.

  It is preferable that the skin material 9 allows sound to pass through well and reduces the passage of water. In the present embodiment, the wire mesh is formed by knitting metal fibers such as aluminum. However, for example, the same material as the sound absorbing material 5, a resin material, or the like may be knitted. When the sound absorbing material 5 is made of the same material as the sound absorbing material 5, the sound absorbing material 5 and the skin material 9 can be formed integrally, so that the cost can be reduced.

  The skin material 9 made of a wire mesh or the like can be deformed when a load is applied in the vehicle height direction, and can return to its original shape by elasticity when the load is removed. Moreover, since the edge part 9a of the skin material 9 is hold | maintained at the base material 4 in the state which can rock | fluctuate, it permits that the skin material 9 deform | transforms with a load.

  The base material 4 should just be what can hold | maintain the sound-absorbing material 5 and the skin material 9 in a vehicle, and is comprised with metals, hard resin, etc., such as aluminum. Since the water outlet 11 is for discharging the water absorbed by the sound absorbing material 5, it is preferable to provide a plurality of water outlets 11 as shown in FIG.

  The wire 8 is formed by coating a steel wire or the like with vinyl or the like. When the wire 8 is pulled in the direction of the arrow B from the state of FIG. 2A, the fastener 7 connected to the wire 8 is pulled upward in the vehicle height direction. As the fastener 7 is pulled, a load is applied to the skin material 9 and the skin material 9 is deformed in the vehicle height direction to compress the sound absorbing material 5.

  Fig.3 (a) shows sectional drawing of the sound absorber for vehicles by which the fastener 7 was pulled to the vehicle height direction upper side. In FIG. 3A, the same components as those in FIG. 2A are denoted by the same reference numerals, and the description thereof is omitted. When the fastener 7 is pulled upward in the vehicle height direction, the skin material 9 is deformed into an arch shape on the floor panel 3 and the sound absorbing material 5 is compressed, so that the moisture contained in the sound absorbing material 5 is squeezed and discharged. be able to. The discharged water is removed from the water outlet 11.

  Thus, in the vehicle sound absorbing device of the present embodiment, the moisture contained in the sound absorbing material 5 can be squeezed and discharged by pulling the wire 8 by the wire pulling means. The wire pulling means may be any type, but it is preferable that the wire 8 is connected to the parking brake 12 as shown in FIG. The parking brake 12 is normally connected to the brake shoe of the rear tire via the parking brake cable 13, and the vehicle sound absorbing device 1 is interlocked with the parking brake 12 by connecting the middle of the parking brake cable 13 to the wire 8. Works.

  When the parking brake 12 is actuated when the vehicle is stopped, the wire 8 is pulled together with the parking brake cable 13 in the direction of arrow B, and the skin material 9 is deformed into an arch shape projecting toward the floor panel 3. And the sound absorbing material 5 between the skin material 9 and the skin material 9 are compressed. The water that is compressed and discharged from the sound absorbing material 5 is removed from the water flow port 11 of the substrate 4. Therefore, since the water contained in the sound absorbing material 5 is discharged early before freezing while the vehicle is parked or stopped, it is possible to prevent water dripped from the sound absorbing device 1 for the vehicle from being frozen together with the road surface. .

  The parking brake 12 may be a so-called electric type. In such a case, the actuator pulls the parking brake cable 13 and the wire 8 by pressing a switch for operating the parking brake 12, so that the water contained in the sound absorbing material 5 is removed. Discharged.

  When the parking brake 12 is released, the skin material 9 returns to a state substantially parallel to the road surface as shown in FIG. 2 (a) due to the elasticity of the skin material 9, so that the aerodynamic characteristics are reduced when the vehicle travels, and wind noise is reduced. Will not occur.

  As described above, according to the vehicle sound absorbing device 1 of the present embodiment, the sound absorbing efficiency is excellent and it is possible to prevent freezing between the sound absorbing means and the road surface even if water enters. Since the sound absorption can be efficiently performed by using the fiber-based sound absorbing material 5, it is not necessary to reduce the emitted sound, such as designing a tread pattern of the tire, and the deterioration of the basic performance of the tire can be avoided. Therefore, the vehicular sound absorbing device 1 according to the present embodiment can achieve both high-efficiency efficient absorption of tire radiated sound and prevention of aerodynamic characteristics and basic performance of the tire.

  Further, when operated in conjunction with the parking brake 12, the driver does not need to separately perform the operation of discharging the water contained in the sound absorbing material 5, so that the operator does not feel inconvenienced. Note that the vehicle sound absorbing device of the present embodiment may be designed not to be interlocked with the parking brake 12 but to periodically discharge water during traveling.

  The vehicle sound absorbing device of the present embodiment may be any device that can discharge water from the sound absorbing material 5. For example, the wire 8 may pull the plurality of fasteners 7 to compress the sound absorbing material 5. FIG. 4A illustrates an example of a vehicle sound absorbing device in which the wire 8 is branched and connected to two fasteners 7. In the vehicle sound absorbing device as shown in FIG. 4A, the amount of compression of the sound absorbing material 5 can be increased, so that the water contained in the sound absorbing material 5 can be discharged earlier.

  FIG.4 (b) shows an example of the top view of the sound absorber 1 for vehicles of Fig.4 (a). In the vehicle sound absorbing device of FIG. 4B, the fastener 7 has a long axis in the vehicle width direction. In such a configuration, since the area of the fastener 7 can be increased, the water contained in the sound absorbing material 5 can be discharged earlier. Further, the fastener 7 may have a plan view, a cross shape, an ellipse, a circle, or the like.

  2 to 4, the sound absorbing material 5 is compressed in the vehicle height direction, but the vehicle sound absorbing device of the present embodiment may compress the sound absorbing material 5 in the vehicle width direction or the vehicle front-rear direction. The compression amount of the sound absorbing material 5 can be further increased by compressing the sound absorbing material 5 in the vehicle width direction or the vehicle front-rear direction.

1 is a schematic view of a vehicle sound absorbing device disposed in a vehicle. It is AA sectional view taken on the line of FIG. It is the schematic of the sound absorber for vehicles connected to the parking brake. It is a figure which shows the structural example of the sound absorber for vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle sound-absorbing device 2 Tire 3 Floor panel 4 Base material 5 Sound-absorbing material 6 Pulley 7 Fastening device 8 Wire 9 Skin material 11 Flow outlet 12 Parking brake

Claims (6)

  A vehicle sound absorbing device comprising: a sound absorbing material; and a discharging means for discharging water absorbed by the sound absorbing material.   The vehicle sound absorbing device according to claim 1, wherein the discharging means squeezes the sound absorbing material to discharge water.   The vehicle sound absorbing device according to claim 1 or 2, wherein the discharging means discharges water in conjunction with a parking brake of the vehicle. The discharging means is a skin material provided on the road surface side of the vehicle body,
A wire penetrating the sound absorbing material interposed between the skin material and the skin material and the vehicle body,
When the wire is pulled upward in the vehicle height direction, the skin material compresses the sound absorbing material and discharges water from the sound absorbing material.
The vehicle sound absorbing device according to any one of claims 1 to 3.   The sound absorbing device for a vehicle according to claim 4, wherein the wire is connected to the parking brake.   6. The vehicle sound absorbing device according to claim 1, wherein the sound absorbing material is disposed on a road surface side of a floor panel, a wheel house, an engine room, or a trunk room.

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