JPH10324201A - Insulator dash for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify manufacturing process and metal molding arrangement, and improve formability of an insulator dash and sealability around a penetration hole in such an insulator dash for automobile that an inexpensive nonforming type of felt, nonwoven fabric are used for a base sound absorbing material, and a thickening sound absorbing material. SOLUTION: As a base sound absorbing material 31, a nonforming type of flat sheet is used and set up as to be 8 mm or less in thickness. Thereby, a sound insulating material 20, the base sound absorbing material 31 and a thickening sound absorbing material 30 can be press solidified while followability of the sound absorbing materials 31 and 32 to the sound insulating material 20 is improved, without shape collapse of a product, further, a penetration hole 12 can be set up to be a small diameter so that sound insulation performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator dash for an automobile mounted on the interior side of a dash panel. In particular, the invention uses an inexpensive non-molded type sound absorbing material as a base sound absorbing material and a thickened sound absorbing material. , The number of manufacturing steps can be simplified, and there is no
The present invention relates to an insulator dash for a vehicle capable of improving sound insulation performance.

[0002]

2. Description of the Related Art As shown in FIG. 8, a dash panel 1 for dividing a vehicle into an engine room E and a vehicle room R is provided with a sound insulating dash 2 for a vehicle. The insulator dash 2 is made of a sound insulating material 3 having a high surface density, such as a thermoplastic resin sheet or a recycled rubber sheet mixed with a filler having a high specific gravity, and a porous material such as a felt, a nonwoven material, etc. integrated on the back side thereof. And a sound absorbing material 4 made of a laminated body.

[0003] The insulator dash 2
In order to achieve a good double-wall sound insulation function between the dash panel 1 and the sound insulating material 2, it is preferable that the dash panel 1 be fitted tightly along the interior surface of the dash panel 1 having a complicated surface shape. The clearance, that is, the thickness of the sound absorbing material 4 is set to be thick at a portion having a high transmittance from the room E to the cabin R so that a desired soundproof function is achieved.

[0004] Therefore, although a molded felt and a bulky molded nonwoven fabric are used as the sound absorbing material 4 and molded into an uneven shape, a general-purpose insulator dash 2 is used.
In FIG. 9, as shown in FIG. 9, the sound absorbing material 4 installed on the inner surface side of the sound insulating material 3 is composed of two layers: a base sound absorbing material 4a and a thickened sound absorbing material 4b which is partially adhered only to the thickened portion. ,
Insulator dashes 2 are manufactured using inexpensive non-molded felt or non-molded nonwoven fabric, both of which reduce product cost.

[0005] An insulator dash 2 using two layers of the sound absorbing material 4 of the base sound absorbing material 4a and the thickened sound absorbing material 4b.
Referring to the flow chart shown in FIG. 10, the sound insulating material 3 is softened by a heating process, and a hot melt adhesive such as polyethylene powder is applied to one surface of the base sound absorbing material 4a. The sound insulating material 3 and the base sound absorbing material 4a are set in a press die, and the sound insulating material 3 is set.
Is formed into a required shape, and a base sound absorbing material 4 a is integrally attached to the inner surface side of the sound insulating material 3.

Then, after applying a hot melt adhesive to the thickened sound absorbing material 4b, the thickened sound absorbing material 4b is adhered to a predetermined portion of the base sound absorbing material 4a by using another crimping die.
The pier trim processing is performed to complete the manufacture of the insulator dash 2.

As a material of the sound insulating material 3 and the sound absorbing material 4 used in the conventional insulator dash 2, a rubber sheet is used as the sound insulating material 3, and a base sound absorbing material 4 is used.
a is a cured felt (non-molded type) having a heat of 10 mm, and as the thickened sound absorbing material 4b, a flat sheet such as a non-molded type cured felt having a thickness of 8 to 15 mm is used.

[0008]

As described above, in the insulator dash 2 conventionally using a non-molding type fiber mat material such as a cured felt as the base sound absorbing material 4a and the thickened sound absorbing material 4b, the sound insulating material 3 And a pressing step of integrating the base sound absorbing material 4a with the base sound absorbing material 4a and a pressing step of integrating the thickened sound absorbing material 4b with a pressing mold are required, and two press dies are required. The mold equipment is bulky and the number of steps is large, which has been a major factor in causing a decrease in productivity.

Further, since the thickness of the base sound-absorbing material 4a is large, the thickness of the thickened sound-absorbing material 4b becomes thin, so that the thickened sound-absorbing material 4b is easily displaced in the pressing step and the thickness of the base sound-absorbing material 4a. Because of the large thickness, there is a problem that the shape is not easily adapted to the shape of the sound insulating material 3, the shape easily collapses, and satisfactory molding accuracy cannot be obtained.

In addition, since the thickness of the base sound absorbing material 4a is large, a single thickened sound absorbing material 4b is not sufficient, and a plurality of thickened sound absorbing materials 4b are required. The adhesive used for the thick sound-absorbing material 4b must also use a high-cost hot-melt type adhesive, which takes a lot of man-hours.
This was a factor that raised costs.

Further, since the base sound absorbing material 4a is thick, there is a disadvantage that the sealing performance around the through hole 5 is reduced. That is, as shown in FIG. 11, when fixing the mounting piece 6a of the air conditioner 6 such as a cooler unit via the bolt 7 planted on the bracket 1a of the dash panel 1, the bolt 7 is inserted into the through hole of the insulator dash 2. 5, and after being inserted into the mounting hole 6b provided in the mounting piece 6a of the air conditioner 6, the nut 7a is tightened and fixed from the tip side. However, since the thickness of the base sound absorbing material 4a in the insulator dash 2 is large, the bracket 1a To avoid interference with
The diameter of the through-hole 5 must be set relatively large, and the sealing performance around the through-hole 5 is poor, so that sound leakage easily occurs from this portion, and this has been a factor that significantly reduces the sound insulation performance.

The present invention has been made in view of such circumstances, and a non-molding type base sound absorbing material is adhered to the inner surface of a sound insulating material, and the non-molding type sound absorbing material is applied only to a portion having a large clearance between the panel and the panel. For automotive insulator dash with thickened sound absorbing material, mold equipment and molding process can be simplified, and product cost can be reduced.
An object of the present invention is to provide an insulator dash for an automobile having excellent molding accuracy, no sound leakage from a through hole, and improved sound insulation performance.

[0013]

In order to achieve the above-mentioned object, the present invention provides a dash panel for partitioning an engine room and a passenger compartment, the dash panel being provided on a vehicle interior surface, and a sound absorbing material provided on a back surface of the sound insulating material. The sound-absorbing material consists of a base sound-absorbing material that has almost the same shape as the sound-insulating material, and a thickened sound-absorbing material that is attached only to the area where the clearance between the dash panel and the sound insulating material is set large. In the automotive insulator dash has been, the base sound absorbing material,
The thickness is set to be 8 mm or less, and the thickened sound absorbing material is formed of a non-molded type fiber mat material having a thickness greater than that of the non-molded type fiber mat material. .

Here, the sound insulating material may be appropriately selected from thermoformable thermoplastic sheets, such as a (regenerated) PVC sheet and a (regenerated) rubber sheet mixed with a filler having a high specific gravity.

On the other hand, the sound absorbing material includes a base sound absorbing material attached to the back surface over substantially the entire surface of the sound insulating material and a thick sound absorbing material adhered and fixed to the back surface of the base sound absorbing material only in the thickened portion. It is composed of two layers. First, as a sound absorbing material for the base, a non-molded flat sheet is used as cure felt,
An inexpensive material such as a cured PET (polyester) non-woven fabric sheet having a thickness of 8 mm or less is used.

Similarly, as a material of the thickened sound absorbing material, a non-molded flat sheet, such as Cure Felt or Cure PE is used.
It is a T nonwoven fabric sheet or the like, the thickness of which is greater than the thickness of the base sound absorbing material.

Further, the present invention is characterized in that the base sound absorbing material and the thickened sound absorbing material are adhered and integrated along the inner surface shape of the sound insulating material when the sound insulating material is formed.

As is apparent from the above configuration, according to the present invention, since the thickness of the base sound absorbing material is set to be thin, if the three members of the sound insulating material, the base sound absorbing material, and the thickened sound absorbing material are pressed, the thickness is increased. Since the pressing pressure is applied to the sound absorbing material, the three members can be integrated in one pressing step.

Further, since the base sound absorbing material is of a thin type,
The ability to follow the sound insulating material is good, the shape of the product does not collapse, the base sound absorbing material is thin, and the periphery of the through hole does not interfere with the bracket or the like, so that the through hole can be set to a small diameter.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a vehicle insulator dash according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an external view of an insulator dash for a vehicle according to the present invention, FIG. 2 is a cross-sectional view showing a configuration of the insulator dash, FIG. 3 is a front view of a base sound absorbing material in the insulator dash, and FIG. FIG. 5 is a front view of the thickened sound absorbing material in the dash, FIG. 5 is a flowchart showing a manufacturing process of the insulator dash, FIG. 6 is a schematic diagram of a press integration process in the manufacturing process of the insulator dash, and FIG. It is a principal part sectional view which shows the structure around a hole.

In FIG. 1 and FIG. 2, an automotive insulator dash 10 is mounted on a cabin side of a dash panel 11 for partitioning an engine room E and a cabin R. The insulator dash 10 contains a filler having a high specific gravity. A sound insulating material 20 made of a thermoplastic sheet material having a relatively high surface density, such as a filled PVC sheet, a recycled PVC sheet, a rubber sheet, a recycled rubber sheet, etc., and a sound absorbing function which is integrated on the back surface side of the sound insulating material 20 and has a desired sound absorbing function. The sound absorbing material 30 includes a base sound absorbing material 30 installed over the entire surface of the sound insulating material 20 and a thickened sound absorbing material 32 selectively installed only in the thickened portion. It is composed of a laminate.

More specifically, in the present invention, a non-molded type cured felt having a thickness of 8 mm is used as the base sound absorbing material 31, and a non-molded type cured felt having a thickness of 12mm is also used as the thickened sound absorbing material 32. You are using

As described above, in the insulator dash 10 of the present invention, the thickness of the base sound-absorbing material 31 is set to be thin so that the shape of the sound-insulating material 20 can be reliably followed. Since it is rigid and does not induce shape collapse of the product, it is excellent in shape retention, and the base sound absorbing material 31 is thin, so that the sound insulating material 20, the base sound absorbing material 31, and the thickened sound absorbing material will be described later. 32
Of the three parties can be integrated.

The base sound absorbing material 31 and the thickened sound absorbing material 32
3 and 4 and Table 1 shows combinations of materials used.

As described above, according to the present invention, an inexpensive non-molding type sound absorbing material, for example, a non-molded cured felt and a non-molded cured PET non-woven fabric can be appropriately combined.

[0027]

[Table 1]

Next, the manufacturing process of the insulator dash 10 will be described with reference to the flow chart of FIG. 5 and the schematic diagram of FIG. 6. The sound insulating material 20 is heated to a softening temperature by a heater device, and a base sound absorbing material. Lumber 31
A hot-melt adhesive a such as polyethylene resin powder is applied to the opposite surface side of the sound insulating material 20, and the hot-melt adhesive b is also applied to the thick sound absorbing material 32 on the opposite side to the base sound absorbing material 31. Apply.

Then, a cold press molding die (lower die 4)
A thickened sound absorbing material 32 and a base sound absorbing material 31 are set on a lower mold 40 (a split mold of the upper mold 41), and a peripheral edge of the preheat-treated sound insulating material 20 is held thereon by a clamp 42. When the upper and lower dies 40 and 41 are clamped and cold-pressed, the sound insulating material 20 is formed into a required shape, and the base sound absorbing material 3 is provided on the back side of the sound insulating material 20.
1 and the thickened sound absorbing material 32
Is fixedly adhered.

Therefore, in the conventional method, two steps, ie, a pressing step of the sound insulating material and the base sound absorbing material, and a pressing step of the thickened sound absorbing material and two dies are required. By setting the thickness of 31 to be thin, the three members can be integrated in one press step, and the mold equipment and the number of manufacturing steps can be simplified.

This is presumed to be because the base sound absorbing material 31 is set to be thin, so that the pressing pressure works effectively up to the thickened sound absorbing material 32 and the residual heat of the sound insulating material 20 can be effectively used.

As described above, according to the present invention, in spite of using an inexpensive non-molding type fiber material, for example, a cured felt, a cured non-woven fabric, etc., in place of an expensive molded felt or a molded non-woven fabric, the molding is performed. In addition to the advantages of high accuracy, fewer steps, and simplified mold equipment,
As will be described later, the sound insulation is also improved.

FIG. 7 shows the structure of the mounting portion of the cooler unit 50. In the insulator dash 10 for an automobile according to the present invention, a small-diameter mounting hole 12 is formed through the sound insulating material 20 and the base sound absorbing material 31. The thickened sound absorbing material 32 has a mounting space for the bracket 60 fixed to the dash panel 11 by welding.

In the cooler unit 50, mounting pieces 51 are formed corresponding to the bolts 61 planted in the bracket 60, and the insulator dash 10 is installed at an appropriate position on the dash panel 11, and the bracket 60 is mounted. After inserting the bolt 61 into the small-diameter through hole 12 of the insulator dash 10 and the mounting hole 52 of the cooler unit 50, the nut 62 is tightened from the tip side, whereby the cooler unit 50 is firmly fixed to the dash panel 11. .

At this time, the sound insulating material 20 and the base sound absorbing material 3
7 is deformed along the mounting piece 51 of the cooler unit 50 as shown in FIG. 7, the sealing performance around the through hole 12 can be maintained well, and good sound insulation performance without sound leakage is expected. it can.

[0036]

As described above, the automotive insulator dash according to the present invention has the following special effects.

(1) According to the first and second aspects of the present invention,
Since the sound absorbing material is composed of a laminated body of the base sound absorbing material and the thickened sound absorbing material, and the thickness of the base sound absorbing material is set to be as thin as 8 mm or less, the followability of the sound absorbing material to the sound insulating material is good, and the molding is performed. This has the effect that the initial shape can be maintained for a long time without subsequent shape collapse or the like.

(2) According to the first and second aspects of the invention,
The sound absorbing material is composed of a laminated body of the base sound absorbing material and the thickened sound absorbing material, and the thickness of the base sound absorbing material is set to be thin, so that the through hole can be set to a small diameter and the interference action around the through hole is suppressed. Therefore, the sealing performance around the through hole is improved, and an effect that good sound insulation performance can be expected.

(3) According to the third aspect of the present invention, the base sound absorbing material and the thickened sound absorbing material are formed of a laminated body as the sound absorbing material, and the sound insulating material, the base sound absorbing material and the thickened sound absorbing material are combined. Since the structure is such that the presses are integrated in one process, the number of steps can be reduced by half and the mold equipment can be simplified as compared with the conventional method, which has the effect of significantly reducing costs.

[Brief description of the drawings]

FIG. 1 is an external view showing an embodiment of a vehicle insulator dash according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a front view of a base sound absorbing material in the automotive insulator dash shown in FIG. 1;

FIG. 4 is a front view of a thickened sound absorbing material in the automotive insulator dash shown in FIG. 1;

FIG. 5 is a flowchart showing a manufacturing process of the automotive insulator dash shown in FIG. 1;

FIG. 6 is a schematic view showing a press integration step in a manufacturing process of the automotive insulator dash shown in FIG. 1;

FIG. 7 is a sectional view showing a seal structure around a through hole of the insulator dash for a vehicle according to the present invention.

FIG. 8 is an explanatory view showing a place where a conventional insulator dash is installed.

FIG. 9 is a sectional view showing a configuration of a conventional insulator dash.

FIG. 10 is a flowchart showing a manufacturing process of a conventional insulator dash.

FIG. 11 is a cross-sectional view showing a structure near a through hole in a conventional insulator dash.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulator dash for automobiles 11 Dash panel 12 Through hole 20 Sound insulating material 30 Sound absorbing material 31 Base sound absorbing material 32 Thickened sound absorbing material 40, 41 Cold press molding die 50 Cooler unit 51 Mounting piece 60 Bracket 61 Bolt 62 Nut a, b Hot Melt adhesive

Claims (3)

[Claims] 1. A sound absorbing material (30) is installed on the interior surface of a dash panel (11) that partitions an engine room (E) and a vehicle room (R), and is mounted on the back surface of a sound insulating material (20). The sound absorbing material (30) is formed as
0) and a thickened sound absorbing material (32) that is attached only to a portion where the clearance between the dash panel (11) and the sound insulating material (20) is set to be large. In the configured automotive insulator dash, the base sound absorbing material (31) is set to a thickness of 8 mm or less, is made of a non-molded type fiber mat material, and the thickened sound absorbing material (32) is more than that. An insulator dash for an automobile, comprising a non-molded type fiber mat material having a thickness of. 2. The base sound absorbing material (31) and the thickened sound absorbing material (32) are made of a non-molded type felt or a non-molded type bulky nonwoven fabric. The automotive insulator dash according to the description. 3. The sound absorbing material (31) and the thickened sound absorbing material (32) are adhered and integrated along the inner surface shape of the sound insulating material (20) when the sound insulating material (20) is formed. The automotive insulator dash according to claim 1 or 2, wherein: