JPH0117475Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an insulator for an automobile, and particularly to an insulator with improved waterproofness and sound insulation.

Automotive insulators are installed on the front floor of the vehicle interior, that is, on the darts panel that separates the engine compartment from the vehicle interior, to reduce noise from vibrations from the engine compartment and maintain a quiet interior. Its constituent material is generally a sound-absorbing material made of a porous sheet such as felt, and a rubber or vinyl chloride sheet, or EVA.
A sound insulating layer made of a high specific gravity sheet such as a sheet is laminated in double layers, the outer periphery of the sound insulating layer is trimmed to match the shape of the floor surface, and the sound insulating layer is formed into a curved shape to match the curved surface.

A problem with the insulator configured as described above is that when the sound absorbing material is made of felt, the edges tend to fray if the outer periphery or the opening formed in correspondence with the steering shaft, etc. is simply trimmed. In addition to being unsightly, the sound absorbing material made of felt has water and oil absorbing properties, so if it is placed on the steel plate dash panel surface, it will not absorb water or water.
Alternatively, the felt is likely to be impregnated with oil, etc., which increases the weight, and also causes rust on the surface of the dash panel and deterioration of the felt itself.

Measures to prevent this kind of thing include, for example, compressing the outer periphery of the insulator tightly to prevent fraying, or applying large amounts of heat and pressure when molding the felt to prevent it from fraying as a whole. Although efforts have been made to make felt sound absorbing materials harder, all of these measures inevitably become negative factors in preventing vibration and noise.

Furthermore, in the case where the peripheral edge is simply cut in this way, for example, when joining this and the dash panel, the edge part has a thickness, which creates a step between it and the dash panel, which not only looks bad, but also Various problems have been pointed out, including large vibration and sound leakage from the parts.

This idea was devised in view of the conventional problems mentioned above, and its purpose was to trim the sound insulating sheet to be larger than the outer circumference of the felt sound absorbing material, and to overhang the inside of the component insertion hole opened in the sound absorbing material. A through hole is formed, and the sound insulating sheet is made to protrude from the inner and outer periphery of the sound absorbing material, and a sheet formed in the same shape as the sound insulating sheet is provided on the back side of the sound absorbing material, and the protrusion of each of these sheets is The present invention provides an insulator for an automobile in which the felt sound absorbing material is wrapped airtight by bonding the pieces together.

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

FIGS. 1 and 2 show an insulator for an automobile according to this invention. This insulator 1 is made by trimming a sound insulating sheet 2 made of a heavy sheet such as a rubber sheet, vinyl chloride, or EVA sheet in advance, and A curved surface is formed by heat compression or the like in accordance with the surface shape, and a trim-cut felt sound absorbing material 3 is attached to the lower surface of the curved surface by heat and pressure using an adhesive. At appropriate positions in the insulator 1, there are a large diameter through hole 4 for allowing parts such as shafts and pedals that protrude from the floor surface to penetrate therethrough, and a small diameter through hole for fitting other harnesses and the like. 5 is formed through the sound insulating sheet 2, and the outer periphery of the sound insulating sheet 2 is trimmed to be larger than the outer periphery of the felt sound absorbing material 3, so that a protruding piece, ie, a sealing tongue, protrudes from the edge of the felt sound absorbing material 3. Piece (peripheral area surrounded by dotted line in Figure 1) 2
a is provided in a protruding manner, and at the upper part of each of the through holes 4 and 5, a seal tongue piece 2b having a smaller diameter than the felt sound absorbing layer overhangs inside the through hole formed on the sound absorbing material 3 side. It is molded.

Next, in FIG. 2, reference numeral 6 denotes a sheet laid on the lower surface of the felt sound absorbing material 3 and trimmed to have the same shape as the sound insulating sheet 2, and the edge of this sheet 6 is attached to the seal tongue 2a. The opening 4 or 5 is bonded to the opening 4 or 5 by welding or the like.
The inwardly projecting protruding piece 6b is also joined to the sealing tongue piece 2b by welding, and the felt sound absorbing material 3 is wrapped airtightly between the sheet 6 and the sound insulating sheet 2.

The material of the sheet 6 may be the same or different from the sound insulating sheet, such as polyolefin or polyester film, nonwoven fabric, etc., and thinner than this, or other material that can be at least high-frequency welded. good. As described above, this sheet 6 works together with the sound insulating sheet to wrap the felt sound absorbing layer, and also functions as a sound insulating layer. Further, although the above-mentioned high-frequency welding method was used as the bonding method for this product, various other bonding methods such as hot pressing, bonding with an adhesive, blow molding, or cold pressing can be used.

And, such sealing tongue pieces 6a and 2a
When the insulator 1 is attached to the inner panel, the insulator 1 is provided with a seal tongue piece formed by laminating the
As shown in Figure 3, the edge of the dash panel P
When the sealing tongue comes into contact with the vertical wall of the panel P, the gap due to the thickness of the sound absorbing material 3 is completely covered up, and This means that vibration and sound leakage from this part can be prevented.

As explained in detail in the examples above, in the automobile insulator according to the invention, the sound insulating sheet is trimmed larger than the outer circumference of the felt sound absorbing material, and overhangs inside the component insertion hole opened in the sound absorbing material. forming an insertion hole formed by
The sound insulating sheet is made to protrude from the inner and outer peripheries of the sound absorbing material, and a sheet formed in the same shape as the sound insulating sheet is provided on the back side of the sound absorbing material, and the protruding pieces of these sheets are adhered to each other to form the felt. Because the sound-absorbing material is wrapped in an airtight manner, compared to conventional methods in which the side edges of the sound-absorbing material are simply trimmed and the cross section is exposed outward, the appearance is less likely to be affected by the fraying of the felt that makes up the sound-absorbing material. In addition to preventing deterioration, each felt sound absorbing material is entirely wrapped between the sheet and the sound insulation sheet, so there is no moisture or oil absorption in this area, and it is highly water and oil resistant. It is possible to prevent the influence of corrosion on the surface of the dashi panel being installed.

In addition, in this invention, a sealing tongue is formed by pasting the edges of each of the above-mentioned sheets to the opening and outer edge of the insulator. There is no difference in level between the edge and the inner panel, and it is covered by the sealing tongue, so it looks good, and it also prevents vibration and sound leakage from this end surface. It has various advantages.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the insulator according to this invention, Fig. 2 is a cross-sectional view taken along the line A in Fig. 1, and Fig. 3 shows the form of the insulator attached to the dash panel in the area surrounded by line A in Fig. 2. FIG. 1...Insulator, 2...Sound insulation sheet, 3
... Felt sound absorbing material, 2a, 2b... Seal tongue piece (protruding piece), 6... Sheet, 6a, 6b... Seal tongue piece (protruding piece).

Claims (1)

[Scope of utility model registration request] A felt sound absorbing material whose outer periphery is trimmed to match the shape of a vehicle body panel such as an automobile floor surface, and which is formed into a predetermined curved shape to be attached to the top surface of the vehicle body panel, and is laminated to the top surface of the felt sound absorbing material. In an automotive insulator equipped with a flexible sound insulating sheet made of a high specific gravity sheet such as rubber, vinyl chloride, EVA, etc., the sound insulating sheet is trimmed to be larger than the outer circumference of the felt sound absorbing material, and the sound absorbing material has openings. An insertion hole is formed to overhang the inside of the component insertion hole, and the sound insulation sheet is made to protrude from the inner and outer periphery of the sound absorbing material, and a sound insulation sheet is formed on the back surface of the sound absorbing material in the same shape as the sound insulation sheet. By arranging sheets having elasticity and flexibility, and bonding the protruding pieces of these sheets to each other to form a sealing tongue, the felt sound absorbing material is wrapped airtightly, and the sealing tongue An automotive insulator characterized by sealing a vehicle body panel.