JP2000071902A - Insulator dash for automobile - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an insulator dash mounted on the indoor side of a dash panel, to enhance the degree of freedom in molding, to improve the workability of mounting to the dash panel, and to reduce the cost. SOLUTION: The insulator dash upper 20 and the insulator dash lower 30 are divided into upper and lower two parts, and the insulator dash upper 20 is formed.
The joint between the dash lower and the insulator dash lower 30 is wrapped to enhance the sound insulation by the triple wall sound insulation function. Further, the basis weight of the insulator dash upper 20 and the insulator dash lower 30 is varied between the upper and the lower. Further, by inserting the insertion piece 43 of the dash panel 40 into the slit 34 of the insulator dash lower 30 or the mounting hole 33, stud bolts and clips are eliminated.

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 of a vehicle.

[0002]

2. Description of the Related Art As shown in FIG. 8, for example, a dash panel 1 for partitioning an engine room E and a vehicle compartment R of a vehicle has an indoor surface side on which noise is propagated from the engine room E into the vehicle compartment R. Insulator dash 2 for vehicles is installed in order to prevent
Is a sound insulating material layer 3 such as a (recycled) PVC sheet or a (recycled) rubber sheet mixed with a filler, felt, a bulky nonwoven fabric,
A laminate with a sound absorbing material layer 4 made of a porous base material such as polyurethane foam is generally used.

[0003] The sound absorbing material layer 4 absorbs noise from the engine room E, and the double-wall sound insulating effect between the dash panel 1 and the sound insulating material layer 3 provides good soundproofing properties in combination with the sound absorbing effect. To demonstrate.

As shown in FIG. 9, the insulator dash 2 is attached to each panel portion of the dash panel 1 such as an insulator dash upper portion 2a, an insulator dash lower portion 2b, and a toe board portion 2c from above. Since the insulator dash 2 is molded as an integral body, the insulator dash upper portion 2a is formed in an expanded shape as shown by a dotted line at the time of molding in consideration of die cutting, and when the insulator dash 2 is mounted on the dash panel 1, The fact is that the insulator dash upper portion 2a is bent and attached to the dash panel 1 on the boundary with the insulator dash lower portion 2b.

[0005]

As described above, in the conventional insulator dash 2, since the molding shape at the time of molding is set to an expanded shape in consideration of punching out from the molding die, it is a large part. In addition to this, there is a problem that the mold surface space is further required, the mold equipment becomes large, the load on the pressing device is increased, and the molding cost is increased.

In addition, since the insulator dash 2 is bent and operated to fix the insulator dash 2 to the dash panel 1 after molding, it is difficult to accurately position the insulator dash 2 on the dash panel 1 and smooth mounting workability cannot be expected. The problem has been pointed out at the same time.

[0007] The present invention has been made in view of such circumstances, and in an insulator dash for a vehicle mounted on the cabin side of a dash panel of a vehicle, the molding cost and press load can be reduced. It is an object of the present invention to provide an automobile insulator dash excellent in workability of mounting to a dash panel.

[0008]

In order to achieve the above object, the invention according to claim 1 of the present application is mounted on the interior surface side of a dash panel for partitioning an engine room and a vehicle compartment, and comprises a sound insulating material layer. And a sound absorbing material layer, the insulator dash is divided into an upper and lower part of an insulator dash upper attached to a dash panel upper part and an insulator dash lower attached to a dash panel lower part. The joint portion between the insulator dash upper and the insulator dash lower is formed of a body, and the joint portion has a triple wall structure because the both portions are appropriately overlapped with a wrap margin.

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

On the other hand, since the sound-absorbing material layer is required to be thermoformable and to have a formability corresponding to a complicated curved surface shape, polyester fiber, conjugate fiber, heat-fusible fiber and the like are appropriately mixed. A bulky nonwoven fabric entangled with the above, or a bulky nonwoven fabric obtained by mixing a thermoplastic resin binder with a polyester fiber or a conjugate fiber in an appropriate ratio is suitable. In addition, a felt for thermoforming and the like can be used.

Next, the invention described in claim 2 of the present application is:
The weight of the sound insulating material layer and the sound absorbing material layer in the insulator dash upper is different from the weight of the sound insulating material layer and the sound absorbing material layer in the insulator dash lower.

Here, the basis weight of the insulator dash upper and the insulator dash lower can be appropriately selected according to the sound transmission volume of the noise from the dash panel upper portion and the dash panel lower portion, and the insulator dash upper is connected to the insulator dash upper. It is preferable to increase the basis weight as compared with the dash lower.

For example, the weight of the sound insulating material layer in the insulator dash upper is 6 to 9 kg / m ² , and the weight of the sound absorbing material layer is 0.8 to 1.4 kg / m ² . On the other hand, the basis weight of the sound insulating material layer in the insulator dash lower is 4 to
6 kg / m ² , and similarly, the weight per unit area of the sound absorbing material layer is 0.8 to 1.4.
The range of kg / m ² is good.

Next, the invention described in claim 3 of the present application is:
The insulator dash lower and the insulator dash upper are superimposed on the surface of the boundary between the dash panel upper and the dash panel lower, and the stud bolts fixed to the dash panel are attached to the mounting holes of the insulator dash lower and the insulator dash upper. The clip is inserted and fixed to the dash panel by fitting and fixing the clip from the tip side of the stud bolt.

The insulator dash upper and the insulator dash lower are joined to each other at the insulator dash lower located on the surface of the insulator dash lower, and a stud bolt facing the indoor side projects from the dash panel surface at this portion. After the insulator dash lower and the mounting hole provided in the insulator dash upper are inserted into the stud bolt, a clip is attached and fixed from the front side of the stud bolt.

Next, according to a fourth aspect of the present invention, an insertion piece is provided at an appropriate interval on a joining flange between a dash panel upper portion and a dash panel lower portion to extend along an upper edge portion of an insulator dash lower. The insertion piece is inserted into a provided slit or a mounting hole, an insulator dash lower is held on a dash panel, and a surface side thereof is covered and mounted with an insulator dash upper.

As is apparent from the above configuration, claim 1
According to the invention described in (1), since the insulator dash is composed of the upper and lower divided bodies, the insulator dash upper and the insulator dash lower may be formed separately, and the mold surface space of the molding die can be reduced. Also, the insulator dash upper and the insulator dash lower can be set separately for the die-cutting direction. In addition, it becomes easy to perform the alignment work when positioning and mounting the insulator dash upper and the insulator dash lower on the dash panel.

Further, the joint between the insulator dash upper and the insulator dash lower has a triple wall structure between the dash panel and the joint because the two are appropriately overlapped with a wrap margin. ,
The sound insulation function can be enhanced.

Next, according to the second aspect of the present invention, since the basis weights of the sound insulating material layer and the sound absorbing material layer of the insulator dash upper and the insulator dash lower are variable, the dash panel is removed from the engine room. The weight per unit area of the sound insulating material layer and the sound absorbing material layer can be appropriately selected according to the transmitted sound volume of the noise transmitted through the vehicle interior, so that an efficient sound absorbing and sound insulating function can be achieved without excessive quality.

According to the third aspect of the present invention, the insulator dash lower and the insulator dash upper are jointly fastened and fixed to a stud bolt provided at a joint portion between the insulator dash lower and the insulator dash upper. Installation with the lower can be done skillfully.

According to the fourth aspect of the present invention, after the insertion piece provided on the joining flange of the dash panel is inserted into the slit of the insulator dash lower, the mounting portion of the insulator dash lower is covered with the insulator dash upper. Because it is a configuration to do
Stud bolts and clips can be eliminated.

[0022]

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 a front view showing an insulator dash upper and an insulator dash lower separately in a first embodiment of an automobile insulator dash according to the present invention, and FIG. 2 is a diagram showing the automobile insulator dash shown in FIG. FIGS. 3 and 4 are explanatory views showing a molding process of an insulator dash upper and an insulator dash lower in the automobile insulator dash shown in FIG. 1, and FIG. 5 is a vehicle insulator dash shown in FIG. It is explanatory drawing of the attachment structure to the dash panel in FIG.

FIGS. 6 and 7 show a second embodiment of the insulator dash for a vehicle according to the present invention.
FIG. 6 is an explanatory view showing a state in which the automobile insulator dash is attached to the dash panel, and FIG. 7 is a cross-sectional view showing a state in which the automobile insulator dash is attached to the dash panel.

Referring to FIGS. 1 to 5, an insulator dash 10 for an automobile according to the present invention comprises an insulator dash upper 20 and an insulator dash lower 30.
It is characterized by being composed of upper and lower two-part bodies.

More specifically, the insulator dash upper 20 is made of a sound insulating material made of a thermoplastic sheet material having a relatively high surface density, such as a (regenerated) PVC sheet or a (regenerated) rubber sheet filled with a filler having a high specific gravity. Layer 21
And a sound absorbing material layer 22 formed of a porous base material such as a molded felt or a molded nonwoven fabric having a desired sound absorbing function and integrated with the back surface of the sound insulating material layer 21.
It is attached to the dash panel upper part 40a.

On the other hand, the insulator dash lower 30
Is the sound insulating material layer 2 of the insulator dash upper 20
1 and a laminated body of a sound insulating material layer 31 and a sound absorbing material layer 32 of the same material as the sound absorbing material layer 22, and are attached to the dash panel lower part 40b and the toe board part 40c.

The thickness of the sound insulating material layers 21 and 31 is 1.5 to
The thickness of the sound absorbing material layers 22 and 32 is 3.5 mm, preferably about 2 mm, and the thickness of the raw material (molded nonwoven fabric) of 20 to 40 mm is drawn and formed between 6 and 30 mm. In particular, in the present embodiment, the insulator dash upper 20 and the insulator dash lower 30 are characterized by being constituted by a two-piece body, and thus the thickness of the sound insulating material layers 21 and 31 and the sound absorbing material layers 22 and 32, so-called basis weight. By making the amount different between the insulator dash upper 20 and the insulator dash lower 30, the dash panel 40 is moved from the engine room E to the vehicle compartment R.
The sound insulation and the sound absorption function can be effectively achieved in accordance with the transmission volume of the noise transmitted therethrough.

For example, the weight of the sound insulating material layer 21 in the insulator dash upper 20 is 6 to 9 kg / m ² ,
The basis weight of the sound absorbing material layer 22 is 0.8 to 1.4 kg / m ² .

On the other hand, the weight of the sound insulating material layer 31 in the insulator dash lower 30 is preferably in the range of 4 to 6 kg / m ² , and similarly, the weight of the sound absorbing material layer 32 is preferably in the range of 0.8 to 1.4 kg / m ² .

As described above, by constituting the upper and lower halves of the insulator dash upper 20 and the insulator dash lower 30, the weight per unit area can be made different, thereby preventing excessive quality and achieving an effective soundproofing function. Since the insulator dash upper 20 and the insulator dash lower 30 can be separately molded in addition to the function and effect of the present invention, large mold equipment and excessive press load are not required unlike the related art.

For example, FIG. 2 shows a state in which the insulator dash upper 20 and the insulator dash lower 30 are mounted on the dash panel 40, respectively. When the drawing direction is indicated by arrow B, in the molding dies 50 and 51 of the insulator dash upper 20 shown in FIG. 3, the operation direction of the upper molding die 51 is made to coincide with the arrow A, and similarly, the insulator dash lower shown in FIG. 30 molding dies 52,5
In No. 3, the operation direction of the upper mold 53 may be made to coincide with the arrow B, and the molding can be easily performed by the small molding dies 50, 51, 52, and 53. Smooth molding can be expected.

Next, a structure for attaching the insulator dash 10 to the dash panel 40 will be described with reference to FIGS. 2 and 5. In the present embodiment, the fixing point of the dash panel 40 has a surface protruding toward the indoor side. The stud bolts 41 are fixed by welding to appropriate places, and mounting holes 23 and 33 are formed in the insulator dash upper 20 and the insulator dash lower 30 corresponding to the stud bolts 41, respectively. After the stud bolt 41 is inserted into the stud bolts 23 and 33, the clip 6
By fitting and fixing 0, the insulator dash upper 20 and the insulator dash lower 30 are attached to the dash panel 40.

Further, both are wrapped along the upper edge of the insulator dash lower 30 and the lower edge of the insulator dash upper 20 (the wrap portion is indicated by oblique lines a and b in FIG. 1). 5 will be described in detail. As shown in FIG. 5, a stud bolt 41 is first inserted through a mounting hole 33 formed near an upper edge portion of the insulator dash lower 30, and then the insulator dash lower 30 is provided on the surface of the insulator dash lower 30. After passing the mounting hole 23 of the insulator dash upper 20 into the stud bolt 41 so that the dash upper 20 is located, the clip 60 is fitted and fixed from the tip end side of the stud bolt 41, so that the wrap portion is fixed.

As described above, since the insulator dash 10 for a vehicle according to the present invention is composed of the upper and lower halves of the insulator dash upper 20 and the insulator dash lower 30, it is formed in a developed shape as in the prior art. It is not necessary to perform an operation of bending the object to match the shape of the dash panel 40, and the insulator dash upper 20 and the insulator dash lower 30 preformed in the shape of the dash panel 40 are adjusted to the surface shape of the dash panel 40. Since it is sufficient to fix via the clip 60, the mounting workability is remarkably improved.

In particular, the insulator dash upper 2
In the lap portion between the dash panel 0 and the insulator dash lower 30, the dash panel 40 and the sound insulator layer 31 of the insulator dash lower 30 and the insulator layer 21 of the insulator dash upper 20 have a triple wall structure.
The cowl box, which has a relatively large transmission volume, allows the triple wall structure to work effectively.In addition to improving the mounting workability by fixing together, the sound insulation performance of the parts with high sound pressure rise is improved. There is an additional benefit that can be enhanced.

FIGS. 6 and 7 show a second embodiment of an insulator dash 10 for a vehicle according to the present invention, which is composed of an upper and lower divided body of an insulator dash upper 20 and an insulator dash lower 30. Although the basic configuration is the same as that of the first embodiment, the difference from the first embodiment lies in the structure of the joint between the insulator dash upper 20 and the insulator dash lower 30 and the mounting structure for the dash panel 40.

That is, the dash panel 40 includes a dash panel upper section 40a and a dash panel lower section 40a.
The connection flange 43 is formed at the connection flange 43 at an appropriate pitch interval along the vehicle width direction and the insulator dash lower 30 is formed so as to correspond thereto. A slit 34 is formed near the upper edge.

Therefore, to attach the insulator dash lower 30 and the insulator dash upper 20 to the dash panel 40, the dash panel lower portion 40
The insulator dash lower 30 is attached and fixed in accordance with the inner surface of the dash panel 40c and the joining flange 42 of the dash panel 40 in a slit 34 provided at an upper edge portion of the insulator dash lower 30. By inserting the inserted piece 43, the upper edge portion of the insulator dash lower 30 is held and fixed to the dash panel 40 side.

In this case, in order to firmly fix the upper edge portion of the insulator dash lower 30 to the dash panel 40 side, a stopper piece 44 facing upward is formed at the tip of the insertion piece 43. Well, the slit 34
Instead, a narrow mounting hole 33 may be used.

After attaching the insulator dash lower 30 to the dash panel 40 side, the insulator dash upper 20 is connected to the dash panel upper section 4.
In this case, the slits 34 provided in the insertion piece 42 and the insulator dash lower 30 can be covered by the insulator dash upper 20, and the appearance performance and the sealing performance are not deteriorated.

If desired, a hook-and-loop fastener or the like is attached to the lower surface of the lower surface of the insulator dash upper 20, and the insulator dash is attached to the insulator dash lower 30 by an engaging action with the hook-and-loop fastener provided at a position corresponding to the surface. The lower edge of the upper 20 may be held and fixed.

Thus, according to the mounting structure of the insulator dash 10 according to the second embodiment, the stud bolt 41 and the clip 60 can be eliminated, and the panel shape in which the insertion piece 43 is formed on the flange 42 of the dash panel 40. By simply devising the above, it is possible to greatly reduce the number of fixtures and equipment, and to reduce costs accompanying cost reduction.

In addition, in terms of mounting workability, it is only necessary to insert the upper edge portion of the insulator dash lower 30 into the insertion piece 43, and the mounting work can be simplified.

[0045]

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

(1) According to the first aspect of the invention, since the insulator dash mounted on the indoor side of the dash panel is constituted by the upper and lower divided bodies, the molding die equipment can be downsized. At the same time, there is an effect that the shaping shape of the insulator dash can be freely set without being restricted by the die-cutting direction or the like.

(2) According to the first aspect of the present invention, since the insulator dash mounted on the indoor side of the dash panel is composed of upper and lower divided bodies, the insulator dash is formed in an expanded shape. After that, there is no need to bend and install according to the shape of the dash panel, and it is only necessary to attach the insulator dash lower and the insulator dash upper individually to the dash panel. Can be improved.

(3) According to the first aspect of the present invention, the insulator dash is composed of the upper and lower divided bodies, and the joint between the insulator dash upper and the insulator dash lower is appropriately overlapped with a wrap margin. Therefore, the triple wall structure formed by the insulator dash lower and the insulator dash upper and the dash panel can be applied particularly to the flange portion where sound is likely to leak in a cowl box having a high sound pressure. This has the effect that sound leakage to the indoor side can be prevented as much as possible.

(4) According to the second aspect of the present invention, the weight of the sound insulating material layer and the sound absorbing material layer in the insulator dash upper and the insulator dash lower composed of the upper and lower divided bodies can be varied between the upper and the lower. The sound insulation function required for each part,
Since the basis weight of the upper and the lower may be adjusted in accordance with the sound absorbing function, there is an effect that an effective sound absorbing and sound insulating function can be achieved without excessive quality.

(5) According to the third aspect of the invention, a stud bolt is formed so as to protrude at a position near a boundary between the dash panel upper portion and the dash panel lower portion, and the insulator dash is formed on the stud bolt. Lore,
Since each mounting hole of the insulator dash upper is inserted, a clip is fitted to the tip side of the stud bolt, and the insulator dash lower and the insulator dash upper are fastened and fixed together, the attachment of the insulator dash lower and the insulator dash upper Can be performed efficiently, and the mounting workability is improved.

(6) According to the fourth aspect of the invention, slits are formed at appropriate intervals along the width direction in the vicinity of the upper edge of the insulator dash lower, and the slits are provided on the joining flange on the dash panel side. The insulator dash lower is held on the dash panel side by inserting and holding it through the inserted piece, and then it is only necessary to mount it so that the insulator dash upper is covered over this part.Therefore, mounting parts such as stud bolts and clips should be eliminated. Therefore, there is an effect that the cost can be reduced by improving the mounting workability and reducing the number of fixtures.

[Brief description of the drawings]

FIG. 1 is a front view showing an insulator dash upper and an insulator dash lower separately in a first embodiment of an automotive insulator dash according to the present invention.

FIG. 2 is a cross-sectional view showing a state where the automotive insulator dash shown in FIG. 1 is attached to a dash panel.

FIG. 3 is an explanatory view showing a forming process of an insulator dash upper in the automotive insulator dash shown in FIG. 1;

FIG. 4 is an explanatory view showing a forming process of an insulator dash lower in the automotive insulator dash shown in FIG. 1;

FIG. 5 is an explanatory view showing a structure for attaching a joint portion between an insulator dash upper and an insulator dash lower to a panel in the insulator dash shown in FIG. 1;

FIG. 6 is an exploded perspective view showing a second embodiment of an automotive insulator dash according to the present invention, showing a dash panel, an insulator dash lower, and an insulator dash upper.

FIG. 7 is a sectional view showing a state where the insulator dash lower and the insulator dash upper shown in FIG. 6 are attached to a dash panel.

FIG. 8 is a side view showing a portion near a dash panel of the automobile.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulator dash for automobiles 20 Insulator dash upper 21 Sound insulating material layer 22 Sound absorbing material layer 23 Mounting hole 30 Insulator dash lower 31 Sound insulating material layer 32 Sound absorbing material layer 33 Mounting hole 34 Slit 40 Dash panel 40a Dash panel upper part 40b Dash panel lower part 40c Toe board part 41 Stud bolt 42 Joining flange 43 Insertion piece 44 Detachment piece 50, 52 Molding lower mold 51, 53 Molding upper mold 60 Clip E Engine room R Car cabin

Continued on the front page (72) Inventor Yukimasa Saka 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Inside Nissan Motor Co., Ltd. (72) Inventor Michio Kudo 2 Takaracho, Kanagawa-ku, Yokohama City, Kanagawa Pref. Person Takashi Iwaki 3316 Miyayama, Samukawa-cho, Koza-gun, Kanagawa Prefecture Kasai Kogyo Co., Ltd.

Claims (4)

[Claims] 1. An automobile insulator dash mounted on the interior surface side of a dash panel (40) for partitioning an engine room (E) and a vehicle compartment (R) and comprising a laminate of a sound insulating material layer and a sound absorbing material layer. In (10), the insulator dash (10) includes an insulator dash upper (20) attached to a dash panel upper part (40a) and a dash panel lower part (4).
0b), the insulator dash lower (3
0), and a joint between the insulator dash upper (20) and the insulator dash lower (30) is formed by appropriately overlapping with a wrap margin. Has a triple wall structure. 2. A sound insulating layer (21) and a sound absorbing layer (22) in the insulator dash upper (20).
2. The insulator dash for an automobile according to claim 1, wherein the basis weight of the insulator dash lower and the basis weight of the sound insulating material layer (31) and the sound absorbing material layer (32) in the insulator dash lower (30) are different. 3. An insulator dash lower (30) and an insulator dash upper (20) are superimposed on a surface of a boundary between the dash panel upper part (40a) and the dash panel lower part (40b), and the dash panel (40) is provided. Stud bolt (41) fixed to the
The mounting holes (33, 23) for the insulator dash lower (30) and insulator dash upper (20)
The stud bolt (41) is attached and fixed to the dash panel (40) by inserting and fixing the clip (60) from the tip side of the stud bolt (41).
Or the insulator dash for motor vehicles of 2 characterized by the above-mentioned. 4. A joining flange (4) between a dash panel upper portion (40a) and a dash panel lower portion (40b).
2) Projecting pieces (43) are protruded at appropriate intervals, and are inserted into slits (34) provided along the upper edge of the insulator dash lower (30) or mounting holes (33). The insulator dash for an automobile according to claim 1 or 2, wherein an insulator dash lower (30) is held by a dash panel (40), and a surface side thereof is covered and mounted with an insulator dash upper (20). .