JPS6061376A - Sandwiched noise-proof and vibration-proof structure for car - Google Patents

Abstract

PURPOSE:To improve the noise-proof and vibration-proof effect by forming a thermally fusable type sheet layer and a thermally blowing type sheet layer between the car side panel and a stopper panel to produce a sandwiched noise- proof and vibration-proof structure thereby improving the tightness and fusability. CONSTITUTION:A sandwitch panel S is composed of a floor panel 1, sheet layer 2A composed of thermally fusable type sheet, floor upper panel 3 as a stopper panel and sheet layer 6A composed of thermally blowing type sheet. It is produced such that a thermally fusable type sheet 2 and thermally blowing type sheet 6 are laminated on the floor panel 1 then the floor upper panel 3 is mounted on said sheet 6 and pressed by a retainer 9. Thereafter, it is heated in a painting oven to fill the gap tightly through expansion pressure of said sheet 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sandwich type soundproofing and vibrationproofing structure for vehicles and a method for manufacturing the same.

(Prior art) Engine vibrations, exhaust system noise, etc. mainly act on the floor of a vehicle from below, and the vibrations are transmitted into the passenger compartment.
Alternatively, low-frequency noise enters the vehicle interior as so-called muffled noise, which tends to cause discomfort to the driver and passengers.

Therefore, vibration damping performance and sound insulation performance of the vehicle body floor are required, and these demands have become particularly important in recent years.

In order to meet the above-mentioned requirements, methods have recently begun to be adopted in which the vehicle body floor is constructed in the form of a so-called sandwich panel.

The structure of the conventional sandwich panel is as follows: First, for example, on the floor panel 1, there is a soundproofing material made of a polymeric viscoelastic material with a high specific gravity and a bituminous damping material (such as thermoplastic rubber) as the main material. , a so-called Melsheet 2 as a vibration isolating material is placed, and a floor upper panel 3, for example, is placed on top of it as a holding panel for the Melsheet 2, and the above is passed through a heating booth in an intermediate painting process. The Melsheet 2 is intended to be integrated with the floor panel 3 by heating and fusing the Melsheet 2.

The sandwich panel S cooperates with the felt 4 and the carpet 5, which have high sound absorption performance and are disposed thereon, and can dramatically improve vibration damping performance and sound insulation performance.

However, during the heat curing process, the Melsheet 2 first expands by a predetermined amount by heating and then contracts by fusing, so that after shrinking, the floor panel 1 and the Melsheet 2 or the Melsheet 2 and the floor upper panel 3.
There were cases in which a gap was created between the two and the above-mentioned Sand German p-nel S could not exhibit its intended performance.

That is, in the conventional sand inch panel S, it is relatively easy to ensure a good welding rate in areas where the surface changes are small, such as the needlework lower panel, but it is relatively easy to ensure a good welding rate in areas where the surface changes are small, such as the floor panel 1 described above. In areas with many irregularities, it was difficult to secure the desired welding rate using Melsheet 2 alone.

In the sand inch panel structure, if there is a gap (air layer) between the vehicle side panel and the holding panel, the presence of the gap will reduce the performance, especially from the standpoint of vibration damping performance, so it is difficult to improve flexibility from the quality perspective. Improving the delivery rate remained an issue to be solved.

(Objective of the Invention) An object of the present invention is to solve the above-mentioned conventional problems, improve the degree of adhesion and fusion of a sandwich structure for a vehicle, and enhance the soundproofing and vibrationproofing effects.

(Structure of the Invention) In order to achieve the above object, the sandwich type soundproofing and vibrationproofing structure for a vehicle according to the present invention includes a heat-welding type sheet layer and a heat-foaming type sheet layer between the vehicle side panel and the holding panel. It is characterized by the formation of

Furthermore, in order to achieve the above object, the method for manufacturing a soundproof and vibration-proof sandwich structure for a vehicle according to the present invention includes disposing a heat-welding type sheet and a heat-foaming type sheet on a vehicle side panel, It is characterized in that both sheets are pressed and fixed with a presser panel and then heated to expand the thermally foamable type sheet.

(Effects of the Invention) In the present invention having the above configuration, in addition to a heat-welding type sheet that has been commonly used as a soundproofing and vibration-proofing material for sandwich panels, a heat-foaming type sheet is combined. The heat-foamed sheet expands when heated and densely fills the gaps between the vehicle side panel and the holding panel, such as beads and embossments, without leaving any gaps. The reaction force from the heat welding sheet further increases the adhesion to the vehicle side panel and the presser panel, improving the binding force between the vehicle side panel and the presser panel, resulting in tight adhesion and welding as a sandwich-type structure. Since the degree of
It becomes possible to dramatically improve soundproofing and vibrationproofing performance.

(Example) Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a main part showing an embodiment of a sandwich panel S as a sandwich type soundproofing and vibrationproofing structure for a vehicle according to the present invention, in which 1 is a floor panel as a vehicle side panel, and 2A is a floor panel as a vehicle side panel. Sheet layer consisting of heat-welding type sheet, 3 is floor upper panel as pressed panel, 6A
is a sheet layer made of a heat-foamed type sheet.

Here, the above-mentioned heat-welding type sheet is a polymeric viscoelastic material whose main material is Kaga front thread vibration damping material, and whose temperature is above a predetermined temperature (
Forming a thin sheet of material that softens when heated (in the case of this embodiment, approximately 110'C or higher) and can be welded to adjacent members (in this embodiment, the floor panel or floor upper panel 3). A typical example is Melcito.

The heat-foamed sheet is a foam containing a viscoelastic substance, which is compressed to a thickness of about 115 to 1/10 degrees using a heat-welding adhesive after foaming, and is heated to a predetermined temperature ( This is the melting temperature of the adhesive, which is at least below the temperature at which the heat-welding type sheet can be softened and welded, and when the adhesive melts, the restraining force of the compressed foam is released, and the thickness before compression is A type of sheet that expands and revives itself.

The heat-foamable sheet is made of, for example, a material (trade name;
Terror Magic).

Next, a method for manufacturing the sandwich panel S according to this embodiment will be explained with reference to FIGS. 4 to 8.

First, as shown in FIG. 4, in the painting intermediate process during the vehicle assembly and manufacturing process, a heat-welded type sheet is placed on the floor panel 1 which is integrally fixed to the inner panel 7 and the sill outer panel 8 as sill members, for example. 2 and the heat-foaming type sheet 6 are placed on top of each other at the same time, and then the floor upper panel 3 is placed on the heat-foaming type sheet 6 as shown in FIG. 3 is pressed and fixed using a suitable fixing member such as a retainer 9.

At this stage, for example, in areas such as the embossed portions 10 formed on the floor panel 1 and the floor upper panel 3, and the beads 11 formed continuously or intermittently at the end of the floor upper panel 3, both of the above-mentioned sheet 2,
A considerable gap 12 exists between the floor panel 6, the floor panel l, and the floor upper panel 3.

However, in this embodiment, after setting to the vehicle, for example,
Heat to 110℃ or higher in a painting oven (not shown) for about 2 hours.
Add for 0 to 30 minutes. Then, the adhesive that restrained the heat-foamed sheet 6 into a compressed shape first melts, the restraining force of the foam is released, and the sheet 6 does not expand to its pre-compressed state, softening and becoming weldable. Pressure is applied to the heat-welding type sheet 2 in this state. Due to the pressure, the seventh
As shown in the figure, a heat-welding type sheet 2 is welded without any gaps to a floor panel 1 having complicatedly shaped surfaces such as the embossed portions 10.

Furthermore, due to the expansion pressure of the heat-foamable type sheet 6 itself and the reaction force against the pressurization of the heat-welded type 2, the voids 12 are eliminated in the embossed portions IO and beads 11 formed on the floor upper panel 3, causing the expansion. The heat-foamed sheet 6 is densely packed, and the adhesion is significantly improved compared to the conventional example.

In addition, with respect to the clearance between the floor panel 1 and the floor upper panel 3 before heating, the thickness of the sandwich panel S after heat treatment is set to be larger than the clearance dimension to ensure adhesion.

After the heat treatment, finishing materials such as felt 4 and carpet 5 may be placed on the sandwich panel S as shown in FIG.

In this example, as mentioned above, due to the synergistic effect of the heat-foaming type sheet 6 and the heat-welding type sheet 2, the degree of adhesion and welding between the sandwich panels S and I is dramatically improved compared to the conventional example, and the generation of voids is prevented. Since the problem can be reliably solved, both soundproofing performance and vibrationproofing performance are improved, and in particular, it is characterized by a marked improvement in vibrationproofing performance.

In this embodiment, an example was shown in which a heat-foamable sheet was disposed on the upper surface of the heat-welding type sheet 2, but the configuration may be reversed.

Next, FIGS. 9(a) to 9(d) are drawings showing another method of manufacturing a sandwich type soundproofing and vibrationproofing structure for vehicles according to the present invention. In this example, in the intermediate painting process, Is there a heat-welding type sheet on the floor panel l as shown in Figure 9 (a)? The heat-foaming type sheet 6 is placed on the floor panel l by heating it to a predetermined temperature or higher in a coating oven to weld it to the floor panel l in advance, and then the heat-foaming type sheet 6 is attached to the heat-welding type sheet 2 as shown in FIG. Place the top and then the ninth
()\) As shown in the figure, after placing the floor upper nozzle 3 as a presser panel and suppressing and fixing it with a retainer 9, etc., it was placed in a coating oven for 110" as in the first embodiment. c or more for about 20 to 30 minutes to expand the heat foam type sheet 6 and form the sandwich panel S by densely filling the gap between the floor upper panel 3 and the heat welding type sheet 2. do.

In this embodiment, since the heat-welding type sheet 2 is welded to cloth in advance on the floor panel 1 as the vehicle side panel, the temperature is higher than the temperature sufficient for the heat-foaming type sheet 6 to expand during the second heating. All you have to do is heat it up.
Moreover, in the second heating, it is only necessary to expand the thermal foam type sheet 6 to fill the voids, so the expansion pressure etc. can be set lower than in the first embodiment, which is a unique effect. can be played.

Next, FIG. 10 shows another embodiment of the sandwich panel S as a sandwich-type soundproof and vibration-proof structure for vehicles according to the present invention. It has a three-layer sheet structure in which a welding type sheet layer 2A is formed.

Therefore, both of the above two manufacturing methods can be applied to the method of manufacturing the sandwich panel S of this embodiment.

In this embodiment, the upper and lower heat-welding type sheets 2 can be tightly welded to the floor panel 1 and the floor upper panel 3 due to the expansion pressure of the heat-foaming type sheet 6. Adhesion with the layer can be further improved.

In each of the above-mentioned embodiments, an example was shown in which a heat-foamed sheet 6 which was compressed and molded was used, but depending on the design conditions, a normal sheet 6 may be used instead of the sheet 6. It goes without saying that the foamable resin material may be foamed during heating to fill the voids.

Further, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the gist of the present invention.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a car body floor using a sandwich-type soundproofing and vibration-proofing structure, FIG. 2 is a sectional view of a main part showing an example of an assembly mode of the sandwich-type soundproofing and vibration-proofing structure, FIG. 3 is a sectional view of a main part showing a first embodiment of the soundproofing and vibrationproofing structure according to the present invention, and FIGS. 4 to 8 each show an example of the method for manufacturing the soundproofing and vibrationproofing structure. Explanatory diagrams shown in Figures 9 (a) to (
D) is an explanatory diagram showing a second embodiment of the method for manufacturing the soundproofing and vibrationproofing structure, and FIG. be. 5----Sandwich panel (sandwich type soundproof and vibration-proof structure) 1-m-Floor panel (vehicle side panel) 2-11 Heat-welded tie sheet 3-m-Floor upper panel (pressing panel) 6--
Thermal foam type sheet patent applicant Nissan Shatai Co., Ltd. Sub-agent Patent attorney Hiroshi Fujiwara ) February 14, 1980 1. Indication of the case 1988 Patent Application No. 169746 2. Title of the invention Sandwich-type soundproofing and vibration-proofing structure for vehicles and its manufacturing method 3. Person making the amendment Relationship with the case Patent Applicant Address: 10-1 Amanuma, Hiratsuka City, Kanagawa Prefecture Name: Nissan Shatai Co., Ltd. Representative: Hiroshi Urakawa 4, Agent Address: 19-807-6, 1-5 Shimomeguro, Meguro-ku, Tokyo
, "Sandwich-type soundproofing and vibration-proofing structure for vehicles and manufacturing method thereof" in column 7 of "Title of the invention" of the specification to be amended and "Title of invention" column of the statement of contents of the amendment has been changed to "Sandwich-type soundproofing and vibration-proofing structure for vehicles and its manufacturing method". "Sandwich-type soundproofing and vibration-proofing structure and its manufacturing method".

Claims (6)

[Claims] (1) A sandwich type soundproofing and vibrationproofing structure for a vehicle, characterized in that a heat-welding type sheet layer and a heat-foaming type sheet layer are formed between a vehicle side panel and a presser spring JU. (2) The heat-welding type sheet layer is a sheet layer made of a polymeric viscoelastic material and mainly made of a bituminous damping material, and is a sheet layer that is welded to the vehicle side panel or the presser panel at a predetermined temperature or higher. The sandwich type soundproofing and vibrationproofing structure for a vehicle according to item 1. (3) The thermal foaming type sheet layer is a foam containing a viscoelastic substance, and is made of a foam containing a viscoelastic substance, and is made of a foam containing a viscoelastic substance, and is made of a foam containing a viscoelastic substance, and is made of a foam containing a viscoelastic substance, and is
The sandwich type soundproofing and vibrationproofing structure for a vehicle according to claim 1, which is a sheet layer which is compression molded to a thickness of body. (4) Arranging a heat-welding type sheet and a heat-foaming type sheet on a vehicle side panel, pressing and fixing both sheets with a presser panel, and then heating to expand the heat-foaming type sheet. A method for manufacturing a sandwich-type anti-vibration structure for vehicles, characterized by: (5) In the painting intermediate process, the heat-welding type sheet and the heat-foaming type sheet are superimposed and arranged on the vehicle (1111 panel), and after being pressed and fixed with the presser panel, 1
5. The method of manufacturing a sandwich-type soundproofing and vibrationproofing structure for a vehicle according to claim 4, wherein heat of 10'C or higher is applied for 20 to 30 minutes. (6) In the intermediate painting process, after the heat-welding type sheet is fused onto the vehicle panel in a painting oven, the heat-foaming type sheet is placed on the heat-welding type sheet, and the holding panel is placed on the heat-welding type sheet. The sandwich type soundproofing for vehicles according to claim 4, characterized in that after being pressed and fixed, heat of 110@C or more is applied for 20 to 30 minutes.
A method for manufacturing a vibration isolation structure.