JP4952361B2 - Floor silencer with duct - Google Patents

Description

  The present invention relates to a floor silencer with a duct. More specifically, the present invention relates to a ducted floor silencer that is excellent in heat insulation and soundproofing and is lightweight.

Conventionally, as shown in FIG. 19 and FIG. 20 (schematic diagram for explaining the FF cross section in FIG. 19), the floor carpet 5 (front seat side) arranged in the vehicle is under the floor, An air duct 6 is provided for blowing fluid from the air conditioning equipment to the foot of the rear seat. As such an air duct, those composed mainly of a resin such as polyethylene (PE) or polypropylene (PP) (for example, see Patent Document 1 and Patent Document 2) are used.
Further, as shown in FIG. 19, a floor silencer 7 is disposed below the floor carpet 5 together with the air duct 6 in order to ensure soundproofing and heat insulation.

However, at present, the resin such as PP and PE used for the air duct does not have sufficient heat insulation performance to be possessed as an air duct and does not have soundproof performance. Due to design restrictions, as shown in FIGS. 19 and 20, the floor silencer 7 (71, 72, 73) needs to be divided around the air duct 6, and the air duct 6 is arranged. In these parts, sufficient heat insulation and sound insulation are not obtained. Furthermore, it is necessary to provide a predetermined gap between the air duct 6 and the floor silencer 7 (71, 72, 73) by design, and this gap also causes a decrease in soundproofing and heat insulating properties. Yes.
Further, the resin air duct is heavy and further weight reduction is desired.

JP 2004-276852 A JP 2004-268807 A

  This invention is made | formed in view of the said situation, and it aims at providing the floor silencer with a duct which is excellent in heat insulation and sound insulation, and is lightweight.

The present invention is as follows.
[1] A floor silencer with a duct which is disposed in a vehicle and is formed of a molded body of a soundproof material. The molded body has a cylindrical duct portion, and the duct portion is for air conditioning. Of fluid can be circulated,
The inner surface of the duct part is covered with a non-breathing layer ,
A floor silencer with a duct , wherein a side wall of the duct part is formed of a material having a higher density than a lower wall of the duct part on the vehicle body side .
[2] The floor silencer with duct according to [1], wherein an upper wall of the duct portion on the vehicle compartment side is formed of a material having a higher density than a lower wall of the duct portion on the vehicle body side. .
[3] The floor silencer with a duct according to the above [1] or [2] , wherein a rib is formed on an upper wall of the duct portion on the vehicle compartment side.
[4] The floor silencer with a duct according to [3], wherein a surface of the lower wall facing the vehicle body is a flat surface without a dent.
[5] The floor silencer with duct according to any one of [1] to [4], wherein the material of the non-ventilated layer is a polyethylene / polyamide laminated film or a polyethylene / polyamide / polyethylene laminated film.

In the floor silencer with duct of the present invention, the duct portion and the floor silencer portion, which are conventionally separately arranged, are integrated, so there is no gap between them, and the heat insulation and soundproofing properties are excellent. Moreover, since the duct part and the floor silencer part are integrated, it leads to reduction of the number of parts, reduction of assembly man-hours, weight reduction of parts, and the like, and productivity such as work time can be further improved. Furthermore, since the duct portion can be easily formed at a desired position, design restrictions are reduced, and a layout can be performed more freely than before.
In addition, when the upper wall on the passenger compartment side of the duct portion is formed of a material having a higher density than the lower wall on the vehicle body side of the duct portion, a floor silencer with a duct having sufficient strength and can do.
Since the side wall of the duct portion is formed of a material having a higher density than the lower wall of the duct portion on the vehicle body side, it has sufficient strength.
In addition, when a rib is formed on the upper wall of the duct portion on the vehicle compartment side, a floor silencer with a duct having higher strength can be obtained.

Hereinafter, embodiments of the present invention will be described in detail.
The floor silencer with a duct according to the present invention is arranged in a vehicle and is formed of a molded body of a soundproof material. This floor silencer with a duct is normally disposed below the floor carpet (front seat side) disposed in a vehicle such as an automobile.

The “molded body” is formed with a cylindrical duct portion through which air-conditioning fluid can flow. Specifically, it is formed at one end (front side of the vehicle) of the molded body and connected to the air conditioning unit of the vehicle, and is formed at the other end (rear side of the vehicle) of the molded body and blown from the air conditioning unit. A cylindrical duct portion including a fluid outlet for discharging the fluid to be discharged to the foot of the rear seat is formed.
In addition, the shape of the said molded object can be suitably adjusted according to the shape etc. of the vehicle body of the vehicle type by which the floor silencer with a duct of this invention is arrange | positioned, a floor carpet, etc.

  Moreover, the material of the said soundproof material is not specifically limited, The well-known material used for the conventional floor silencer can be used. Examples thereof include resin foams such as urethane, felts, foam beads, and nonwoven chip molds. Furthermore, recycled materials from industrial waste materials such as vehicle waste materials [“Recycled Sound-Proofing Products (RSPP)”] and the like can be mentioned. These may be used individually by 1 type, and 2 or more types may be mixed and used.

Density of the soundproofing material is preferably 0.02~0.25g / cm ^3, more preferably 0.06~0.2g / cm ^3, more preferably 0.08~0.12g / cm ³ It is. When this density is 0.02 to 0.25 g / cm ³ , a floor silencer with a duct excellent in soundproofing and heat insulating properties can be obtained.

In the molded body, the upper wall on the passenger compartment side of the duct portion is formed of a material having a higher density than the lower wall of the duct portion on the vehicle body side (hereinafter referred to as “high density material”). It is preferable. In this case, it can be set as the floor silencer with a duct provided with sufficient intensity | strength.
Further, the side walls of the duct part, since it is formed at high density material denser than the lower wall serving as a vehicle body side of the duct section, a ducted floor silencer with sufficient strength.

Examples of the high-density material include recycled fibers such as miscellaneous wool (anti-wool cotton), and thermoplastic resin fibers such as polyethylene, polypropylene, and polyethylene terephthalate (PET). Only one kind of these high-density materials may be used, or two or more kinds may be mixed and used.
When both the upper wall and the side wall of the duct part are formed of a high density material, the high density material forming the upper wall and the side wall may be the same or different.

Density of the high density material is preferably 0.15~2.0g / cm ^3, more preferably 0.2 to 1.0 g / cm ^3, more preferably 0.3 to 0.8 g / cm ³ . When this density is 0.15 to 2.0 g / cm ³ , a floor silencer with a duct having sufficient strength can be obtained.

Further, the thickness of the upper wall when the upper wall is formed of the high-density material can be appropriately adjusted as necessary, and is not particularly limited, but is preferably 0.5 to 10 mm, Preferably it is 1-5 mm, More preferably, it is 1-3 mm. When this thickness is 0.5-10 mm, it can be set as the floor silencer with a duct provided with sufficient intensity | strength.
Furthermore, the thickness of the side wall formed of the high-density material can be appropriately adjusted as necessary, and is not particularly limited, but is preferably 0.5 to 10 mm, more preferably 1 to 5 mm. More preferably, it is 1 to 3 mm. When this thickness is 0.5-10 mm, it can be set as the floor silencer with a duct provided with sufficient intensity | strength.

Further, the inner surface of the duct part is covered with a non-breathing layer.
The material of the non-breathable layer is not particularly limited as long as the duct portion can be kept airtight, and examples thereof include a resin film, a metal film, a rubber film, and a resin foam. Among these, resin films such as polyethylene and polyamide are preferable. In particular, a resin film made of a resin on which at least one surface can be heat-sealed is preferable, and specific examples include laminated films such as polyethylene / polyamide laminated films and polyethylene / polyamide / polyethylene laminated films.

  Although the thickness of the said non-breathable layer is not specifically limited, It is preferable that it is 5-300 micrometers, More preferably, it is 30-100 micrometers, More preferably, it is 45-60 micrometers. When this thickness is 5 to 300 μm, the duct portion can be kept sufficiently airtight.

The cross-sectional shape of the duct part is not particularly limited as long as a predetermined amount of fluid can flow therethrough.
The volume of the duct portion is not particularly limited, and can be appropriately adjusted according to the shape of the vehicle body or floor carpet of the vehicle type on which the floor silencer with duct of the present invention is disposed.

  Ribs can be formed on the upper wall of the duct portion on the vehicle compartment side in order to further improve the strength. The shape of the rib is not particularly limited, and can be, for example, a V-shaped section or a U-shaped section. In addition, such a rib may be formed only in one place and may be formed in two or more places.

Moreover, the said duct part may be formed only in one place, and may be formed in two or more places.
Further, in the duct portion, a plurality of the fluid blowing ports and / or fluid outlets are formed, and a branch is formed in the molded body, so that the duct portion is branched into a plurality of branches such as two or three forks. Also good.

Hereinafter, the present invention will be described in detail with reference to the drawings.
[ Reference Example 1]
<Configuration of Ducted Floor Silencer in Reference Example 1>
As shown in FIG. 1 and FIG. 2 (a schematic diagram for explaining the AA cross section in FIG. 1), a floor silencer 10 with a duct of Reference Example 1 includes a cylindrical duct portion 1, and the fluid is a fluid The air can be distributed from the air blowing port 11 to the fluid blowing port 12.
The floor silencer 10 body with duct is made of a soundproof material 2 [Material: RSPP (80% by mass of vehicle waste material such as urethane foam, 15% by mass of binder (low melting point PET core sheath fiber), 5% by mass of PET fiber), density; 0.08 g / cm ³ ].
The inner surface of the duct portion 1 is covered with a heat-fused non-venting layer 3 (material: polyethylene / polyamide / polyethylene laminated film, thickness: 45 μm).
The floor silencer with duct of Reference Example 1 shown in the figure is used on the left side of the vehicle, and the right-side floor silencer is symmetrical to the left-side one with the center of the vehicle as an axis.

[ Reference Example 2]
<Configuration of Ducted Floor Silencer in Reference Example 2>
As shown in FIG. 3 and FIG. 4 (schematic diagram for explaining the BB cross section in FIG. 3), in the floor silencer with duct 20 of Reference Example 2, the upper wall 13 (thickness) on the side of the passenger compartment of the duct portion 1. 2 mm) is composed of a high-density material [material: high-density fiber [50% by weight of anti-wool cotton, 50% by weight of binder (low melting point PET core-sheath structure fiber)], density: 0.4 g / cm ³ ]. The configuration is the same as that of Reference Example 1 described above except that A non-breathable layer 31 (material: polyethylene / polyamide / polyethylene laminated film, thickness: 45 μm) is formed on the surface of the high-density material on the duct side.

<Performance evaluation of Reference Examples 1 and 2>
(1) Evaluation of heat insulation The floor silencer with a duct of the reference example 1 was arrange | positioned to the left of the front side of the vehicle body in which the air conditioning equipment was arrange | positioned, and the fluid ventilation port in the duct part was fixed to the air conditioning equipment. On the other hand, as a comparative example 1, a conventional air duct and a floor silencer having the following configuration are arranged on the right side of the front side, and a fluid blower opening of the air duct is fixed to the air conditioning equipment.
Then, warm air is blown from the air conditioning equipment for 6 minutes, and the temperature of the fluid at each fluid outlet in the duct portion of Reference Example 1 and the air duct of Comparative Example 1 (that is, the temperature of the warm air that has passed through the duct) is measured. The results are shown in FIG.
Further, warm air is blown from the air conditioning equipment for 6 minutes, and the temperatures of the outer walls at the top of the duct 50 mm away from the fluid outlets in the duct portion of Reference Example 1 and the air duct of Comparative Example 1 (ie, the duct itself). The temperature was measured and the results are shown in FIG.
Also in Reference Example 2, evaluation was performed in the same manner as in Reference Example 1, and the results are shown in FIGS.

[Configuration of Comparative Example 1]
The material of the air duct in Comparative Example 1 (see the air duct 6 in FIGS. 19 and 20) is polyethylene (PE). Further, the shapes and dimensions of the fluid blowing port and the fluid blowing port in the air duct are formed substantially the same as in Reference Example 1.
Further, the material of each floor silencer in Comparative Example 1 (see floor silencer 7 (71, 72, 73 in FIGS. 19 and 20)) is RSPP (80% by mass of vehicle waste material such as urethane foam, binder (low melting point PET). Core-sheath structure fiber) 15% by mass, PET fiber 5% by mass].

(2) Evaluation of soundproofing properties Transmission loss and sound absorption rate were measured as follows and evaluated for soundproofing properties.
(Transmission loss)
The transmission loss in the thickness direction in the vicinity of the fluid outlets of Reference Examples 1 and 2 and Comparative Example 1 (specifically, the region from the fluid outlet to the front side of the vehicle up to 50 mm) was measured according to JIS A 1416 ( However, based on the intensity method, the measurement chamber was an anechoic chamber, the volume of the anechoic chamber was set small, and the size of the measurement sample was set small.) At this time, the measurement was performed separately for (i) when the entire thickness [upper wall + air layer (duct thickness) + lower wall) is constant, and (ii) when the thickness of the air layer is constant, (i 9) shows the result in the case of (ii), and FIG. 10 shows the result in the case of (ii). Table 1 shows the structures of the upper wall and the lower wall in each reference example and comparative example. Further, the thicknesses of the upper wall, the air layer, and the lower wall were set as shown in Table 1.

[Sound absorption rate]
The sound absorption coefficient in the vicinity of the fluid outlets of Reference Examples 1 and 2 and Comparative Example 1 (specifically, the region from the fluid outlet to the front side of the vehicle up to 50 mm) was measured according to JIS A 1409 (however, reverberation) The volume of the chamber was set small, and the size of the measurement sample was set small.) At this time, the measurement is performed separately for the cases (i) and (ii) described above, and the result in the case (i) is shown in FIG. 11, and the result in the case (ii) is shown in FIG.

<Effects of Reference Examples 1 and 2>
(About heat insulation)
According to FIG. 5, the fluid temperature at the fluid outlet in Reference Example 1 is closer to the air-conditioning temperature [warm air; about 55 ° C. (at the start of air blowing; about 47 ° C.)] than Reference Example 1; It was found that can blow air without missing the hot air from the air conditioning equipment. Specifically, the reference example 1 is 9 ° C. higher than the comparative example 1 at the start of air blowing, and the reference example 1 is about 4% more than the comparative example 1 after the air conditioning temperature becomes constant. Hot air could be blown at a high temperature.
Then, according to FIG. 6, the outer wall temperature above the duct portion in Comparative Example 1 is closer to the air conditioning temperature [warm air; about 55 ° C. (at the start of air blowing; about 47 ° C.)] than the reference example 1. It was confirmed that Example 1 missed the heat of the warm air from the air conditioning equipment.

In addition, according to FIG. 7, towards the fluid temperature of the fluid air outlet in Reference Example 2 than Comparative Example 1, air-conditioning temperature [warm air; about 60 ° C. (start of air blowing time: about 50 ° C.)] close to, reference It turned out that the direction of Example 2 can ventilate without missing the heat of the warm air from an air conditioner. Specifically, the reference example 2 is up to 15 ° C. higher than the comparative example 1 at the start of air blowing, and the reference example 2 is about 5% more than the comparative example 1 even after the air conditioning temperature becomes constant. Hot air could be blown at a high temperature.
Then, according to FIG. 8, the outer wall temperature above the duct portion in Comparative Example 1 is closer to the air conditioning temperature [warm air; about 60 ° C. (at the start of air blowing; about 50 ° C.)] than in Reference Example 2. It was confirmed that Example 1 missed the heat of the warm air from the air conditioning equipment.

(About soundproofing)
According to FIGS. 9 and 10, in both cases (i) when the entire thickness of the duct portion is constant and (ii) when the thickness of the air layer of the duct portion is constant, Reference Example 1 and Reference It was confirmed that the transmission loss of Example 2 was higher than that of Comparative Example 1.
Further, according to FIGS. 11 and 12, in both cases (i) when the entire thickness of the duct portion is constant and (ii) when the thickness of the air layer of the duct portion is constant, Reference Example 1 It was confirmed that the sound absorption rate of Reference Example 2 was higher than that of Comparative Example 1.

From the above, it was found that the floor silencers with ducts of Reference Example 1 and Reference Example 2 have excellent heat insulation and soundproofing properties.
In addition, each of the floor silencers with ducts of Reference Example 1 and Reference Example 2 has a duct portion and a floor silencer portion that have been separately arranged in the past, so there is no gap between them, and heat insulation and soundproofing Excellent in properties. Furthermore, since the duct part and the floor silencer part are integrated, the number of parts is reduced, the number of assembling steps is reduced, the weight of the parts is reduced, and the productivity such as working time can be further improved. Furthermore, since the duct portion can be easily formed at a desired position, design restrictions are reduced, and a layout can be performed more freely than before.
Moreover, in the floor silencer with a duct of Reference Example 2, because the upper wall on the vehicle compartment side of the duct portion is formed of a material having a higher density than the lower wall on the vehicle body side of the duct portion, Excellent strength.

Further, in the present invention, it may be exemplified Examples 1-2 and Reference Example 3 below as another embodiment. Hereinafter, Examples 1 and 2 and Reference Example 3 will be described with reference to the drawings. In addition, about the structure same as the above-mentioned reference example 1, the same code | symbol is attached | subjected and description of a structure, its effect, etc. is abbreviate | omitted.

[Example 1 ]
<Configuration and Effect of Floor Silencer with Duct of Example 1 >
As shown in FIG. 13 and FIG. 14 (schematic diagram for explaining the CC cross section in FIG. 13), in the floor silencer 30 with duct of the first embodiment, the upper wall 13 (on the vehicle compartment side of the duct portion 1) Thickness: 2 mm) and side wall 14 (thickness: 2 mm) are high-density material [material: high-density fiber (50% by weight of anti-wool cotton, binder (low melting point PET core-sheath structure fiber) 50% by weight)], density: 0 .4 g / cm ³ ], the configuration is the same as that of Reference Example 1 described above. A non-breathable layer 31 (material: polyethylene / polyamide / polyethylene laminated film, thickness: 45 μm) is formed on the surface of the high-density material on the duct side.
In the floor silencer 30 with the duct according to the first embodiment, the upper wall 13 on the vehicle compartment side of the duct portion 1 and the side wall 14 of the duct portion 1 are higher in density than the lower wall 15 on the vehicle body side of the duct portion 1. Since it is formed of a high-density material, it has excellent strength.

[Example 2 ]
<Configuration and Effect of Floor Silencer with Duct of Example 2 >
As shown in FIGS. 15 and 16 (schematic diagram for explaining a DD cross section in FIG. 15), in the floor silencer 40 with a duct of the second embodiment, the upper wall 13 (on the vehicle compartment side of the duct portion 1 ( Thickness: 2 mm) and side wall 14 (thickness: 2 mm) are high-density material [material: high-density fiber (50% by weight of anti-wool cotton, binder (low melting point PET core-sheath structure fiber) 50% by weight)], density: 0 .4 g / cm ³ ] and the above-mentioned Reference Example 1 except that the rib 4 having a V-shaped cross section is formed on the upper wall made of this high-density material. It is the same composition. A non-breathable layer 31 (material: polyethylene / polyamide / polyethylene laminated film, thickness: 45 μm) is formed on the surface of the high-density material on the duct side.
In the floor silencer 40 with a duct according to the second embodiment, the upper wall 13 on the side of the passenger compartment of the duct part 1 and the side wall 14 of the duct part 1 are more dense than the lower wall 15 on the vehicle body side of the duct part 1. Since the rib 4 is formed in the upper wall 13 of the duct part 1, it is excellent in intensity | strength from the high density material.

[ Reference Example 3 ]
<Configuration and effect of floor silencer with duct of Reference Example 3 >
As shown in FIGS. 17 and 18 (schematic diagram for explaining the EE cross section in FIG. 17), in the floor silencer 50 with a duct of Reference Example 3 , the duct portion 1 includes a fluid blowing port 11 and a fluid blowing port. Except that the fluid can flow from the fluid blowing port 11 to the fluid blowing ports 121, 122. The configuration is the same as that of Reference Example 1.
According to the floor silencer 50 with a duct of the reference example 3 , the structure and arrangement position of the duct portion in the floor silencer with a duct according to the present invention can be easily changed and formed as necessary. It can be seen that the layout and the silencer are excellent in layout compared to the conventional case where the part and the silencer are formed separately.

The present invention is not limited to the specific examples described above, and various modifications can be made within the scope of the present invention depending on the purpose and application. For example, the duct part in each of the floor silencers with ducts of Examples 1 and 2 may have a structure branched into a plurality of branches, such as a bifurcated floor silencer as in Reference Example 3 .

It is a schematic diagram explaining the silencer with a duct of the reference example 1. FIG. It is a schematic diagram explaining the AA cross section in FIG. It is a schematic diagram explaining the silencer with a duct of the reference example 2. FIG. It is a schematic diagram explaining the BB cross section in FIG. It is a graph which shows the temperature change of the fluid of a fluid outlet. It is a graph which shows the temperature change of the outer wall of a duct part upper side. It is a graph which shows the temperature change of the fluid of a fluid outlet. It is a graph which shows the temperature change of the outer wall of a duct part upper side. It is a graph which shows a transmission loss. It is a graph which shows a transmission loss. It is a graph which shows a sound absorption coefficient. It is a graph which shows a sound absorption coefficient. It is a schematic diagram explaining the silencer with a duct of Example 1. FIG. It is a schematic diagram explaining the CC cross section in FIG. It is a schematic diagram explaining the silencer with a duct of Example 2. FIG. It is a schematic diagram explaining the DD cross section in FIG. It is a schematic diagram explaining the silencer with a duct of the reference example 3. FIG. It is a schematic diagram explaining the EE cross section in FIG. It is a schematic diagram explaining the conventional air duct and a silencer. It is a schematic diagram explaining the FF cross section in FIG.

  10, 20, 30, 40, 50; floor silencer with duct, 1; duct portion, 11; fluid blowing port, 12, 121, 122; fluid outlet, 13; upper wall, 14; side wall, 15; 2; soundproofing material, 3, 31; non-breathing layer, 4; rib, 5; floor carpet, 6; air duct, 7, 71, 72, 73;

Claims (5)

A floor silencer with a duct arranged in a vehicle and made of a molded body of soundproof material,
In the molded body, a cylindrical duct portion is formed, and air conditioning fluid can be circulated in the duct portion.
The inner surface of the duct part is covered with a non-breathing layer ,
A floor silencer with a duct , wherein a side wall of the duct part is formed of a material having a higher density than a lower wall of the duct part on the vehicle body side .   The floor silencer with a duct according to claim 1, wherein an upper wall of the duct portion on the vehicle compartment side is formed of a material having a higher density than a lower wall of the duct portion on the vehicle body side. The floor silencer with a duct according to claim 1 or 2 , wherein a rib is formed on an upper wall of the duct portion on a vehicle compartment side. The floor silencer with a duct according to claim 3, wherein a surface of the lower wall facing the vehicle body is a flat surface without a dent. The floor silencer with a duct according to any one of claims 1 to 4, wherein a material of the non-ventilated layer is a polyethylene / polyamide laminated film or a polyethylene / polyamide / polyethylene laminated film.

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