JPH0924780A - Sound insulating structure for grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain vibration sounding from an engine from being permeated through a panel around a grommet installed to a body panel and the inside of the grommet. SOLUTION: A sound insulating and dumping seat 11 is bonded, to an inner surface 4b and/or an outer surface 4a of a cabin side at a circumferential periphery of a through hole 4x of a body panel 4, and area not covered by a silenser member 6 mounted over the inner surface at the cabin side of the body panel 4, shall be covered by the sound insulating and dumping seat 11. The sound insulating and dumping seat 11 is overlapped with the silencer member 6, and concurrently, a lip 10e for locking a grommet on to a body is pressed in contact with the sound insulating and dumping seat 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof structure for a grommet, and more specifically, a wire harness is inserted through a through hole provided in a dash panel for partitioning an engine room side and an interior side of an automobile through the grommet. It is possible to effectively suppress engine vibration noise and the like that is transmitted to the indoor side from the dash panel around the grommet and the inside of the grommet in the existing portion.

[0002]

2. Description of the Related Art As shown in FIG. 4, an engine room 2 and a vehicle room 3 of a vehicle 1 are partitioned by a dash panel 4, a grommet 5 is attached to a through hole formed in the dash panel 4, and the grommet 5 is attached. 5 in the engine room 2
A wire harness W / H for electrically connecting electrical components and the like between the vehicle interior 3 and the vehicle interior 3 passes therethrough.

In order to prevent the vibration noise on the engine room 2 side from penetrating into the vehicle compartment through the penetrating portion of this type of grommet, conventionally, a soundproof grommet shown in FIG. 5 (A) has been provided. (Japanese Utility Model Laid-Open No. 57-15626) In the grommet 5 ', the wire harness W / H is loosely inserted with the small-diameter wire insertion portion 5a' through which the wire harness W / H is closely attached and penetrates, and the outer surface. On dash panel 4
The vehicle body mounting portion 5b 'is provided with a locking groove 5c' to the inside of the vehicle body mounting portion 5b ', and the foam-shaped sound insulating material 7 made of urethane sponge or the like is loaded inside the vehicle body mounting portion 5b'.

[0004]

However, in the soundproof grommet 5 described above, it is difficult to match the inner surface of the vehicle body mounting portion 5b 'with the outer surface of the sound insulating material 7, and the gap t is likely to occur, so that the transmitted sound is sufficiently suppressed. could not. Further, the sound insulating material 7 is good if it is a completely independent urethane foam as shown in FIG. 5 (B) because it reflects vibration noise and the like, but if it is a continuous foam urethane foam as shown in FIG. 5 (C). If
It is defective because it allows vibrations and the like to pass through. However, since the former urethane foam is difficult to obtain, the latter urethane foam is often used, and the transmitted sound cannot be suppressed sufficiently from this point as well.

Conventionally, as shown in FIG. 6, a silencer material 6 is attached to the interior side of the dash panel 4, but a grommet 5 is attached at a place where a through hole 4x for passing a wire harness is formed. In order to facilitate the mounting, a mounting hole 6a having a larger diameter than the through hole 4x is provided.
That is, the periphery of the through hole 4x is not covered with the silencer material 6, and the dash panel 4 around the grommet 5 is not substantially soundproofed. Therefore, it was not possible to prevent the dash panel 4 from vibrating due to the vibration on the engine room side and transmitting the vibration sound on the engine room side to the indoor side.

The present invention has been made to solve the above problems, and is a grommet that can effectively suppress engine vibration noise and the like that penetrates into the vehicle from the panel around the grommet mounted on the vehicle panel and the inside of the grommet. The purpose is to provide a soundproof structure.

[0007]

In order to achieve the above object, according to claim 1 of the present invention, there is provided a soundproof structure for a portion where a wire harness penetrates through a through hole of a vehicle body panel via a grommet. , Around the through hole of the vehicle body panel,
Soundproofing on the inner and / or outer panel of the passenger compartment
Providing a grommet soundproofing structure characterized by sticking a vibration damping sheet and covering the area not covered by the silencer material attached to the inner surface of the vehicle body panel on the passenger compartment side with the soundproofing / vibration damping sheet. are doing.

As described above, the area of the vehicle body panel such as the dash panel which is not covered with the silencer material is soundproofed.
By covering with a damping sheet, the soundproofing effect can be enhanced. Particularly, the vibration transmitted directly to the vehicle body panel via the wire harness and the grommet can be absorbed and suppressed by the soundproofing / damping material attached to the peripheral edge of the through hole. Therefore, it is possible to effectively prevent or suppress the vibration sound on the engine room side from being transmitted to the vehicle compartment side.

It is preferable that the soundproofing / damping sheet is overlapped with a silencer material attached to the inner surface of the vehicle body panel on the indoor side, and the vehicle body locking lip of the grommet is pressed against the soundproofing / vibration sheet. (Claim 2)

As described above, by overlapping the outer periphery of the soundproofing / damping sheet with the silencer material,
No gap is created between the soundproof sheet and the soundproof sheet, and vibration noise can be suppressed more effectively. Moreover, by bringing the lip for locking the vehicle body of the grommet into contact with the soundproofing / vibrating material, the vibration transmitted directly to the vehicle body panel through the grommet can be absorbed.

Further, the grommet has a small-diameter electric wire insertion portion through which the wire harness closely contacts and penetrates, and a diameter is expanded from one end of the electric wire insertion portion, and the vehicle body locking lip is provided on the outer peripheral portion thereof and the inside thereof is provided inside. It is preferable that the vehicle body mounting portion into which the wire harness is loosely inserted is provided, and the vehicle body locking lip is locked to an inner surface side or an outer surface side of the vehicle body panel, while the vehicle body mounting portion is filled with a sealing agent for soundproofing. . (Claim 3)

As described above, by filling the inside of the grommet with the sealant, it is possible to more effectively suppress the vibration noise passing through the grommet, and in combination with the soundproofing / vibration sheet, the periphery of the grommet and the inside of the grommet. The transmitted sound of can be completely suppressed. Further, by filling the inside of the grommet with the above-mentioned sealing agent and by mounting a foamed sound insulation material such as sponge described in the conventional example, the sound insulation performance can be further enhanced.

Specifically, the grommet has a small diameter wire insertion portion through which the wire harness closely contacts and the wire harness penetrates into the inside with a gap and contacts the outer surface of the vehicle body panel at the outer peripheral portion. A shape having a vehicle body mounting portion having a large diameter portion having a stop projection portion and a flange portion having a locking lip that abuts the inner surface of the panel, while a silencer material is attached to the inner surface of the panel, The silencer material is provided with a mounting hole having a diameter larger than the through hole of the panel, and the soundproofing / vibrating material is overlapped with the silencer material from a region not covered with the silencer material from the periphery of the through hole of the vehicle body panel. It extends to the position where it is attached and adhered, and the locking lip of the grommet is pressed against the soundproofing / vibration damping material.

Alternatively, the grommet includes a small-diameter electric wire insertion portion through which the wire harness closely contacts, a large-diameter portion through which the wire harness penetrates the interior with a gap, and a flange portion protruding from the large-diameter portion. And a locking lip projecting from the flange portion and contacting the outer surface of the vehicle body panel, and a metal cover that covers the outer surface of the grommet, and bolted to the vehicle body panel from the metal cover through the flange portion. While fixing the structure, the soundproofing / damping sheet is attached to the outer surface of the peripheral edge of the through hole of the vehicle body panel,
The damping sheet is overlapped with a silencer material attached to the inner surface side of the vehicle body panel, and the flange portion of the grommet is arranged so as to cover the soundproofing and damping sheet.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. The same components and operations as those of the prior art shown in FIG. 5 and subsequent figures are denoted by the same reference numerals, and detailed description is omitted. FIG. 1 shows a soundproof structure of a grommet 10 according to the first embodiment, which is attached by being fitted into a through hole 4x formed in a dash panel 4 of a vehicle. The through hole 4x has a shape in which an outer peripheral flange portion 4c is provided so as to protrude toward the engine room 2 side.

The grommet 10 is a wire harness W.
/ H is a shape having a small diameter electric wire insertion portion 10a through which the wire harness W / H closely contacts and a vehicle body mounting portion 10b into which the wire harness W / H is loosely inserted inside with a gap. The vehicle body mounting portion 10b
Is the outer peripheral flange portion 4 on the outer surface 4a side of the vehicle body panel 4.
Large-diameter portion 1 provided with a locking projection 10d that abuts the end surface of c
0f and a flange portion 10c having a vehicle body locking lip 10e located on the inner surface 4b side of the vehicle body panel 4 are projected on the outer peripheral surface.

The inner surface 4 of the dash panel 4 on the vehicle interior 3 side
A thick and flexible silencer material 6 is attached to b. The silencer material 6 is provided with a mounting hole 6a having a diameter larger than that of the through hole 4x formed in the dash panel 4.

On the inner surface 4b side of the dash panel 4,
From the peripheral edge of the through hole 4x, the mounting hole 6a of the silencer material 6
A soundproofing / vibration suppressing sheet 11 having a larger outer diameter is attached. That is, the area not covered with the silencer material 6 is covered with the soundproofing / vibration damping sheet 11 and overlapped with the silencer material 6 so that no gap is generated.

As shown in detail in FIG. 1 (B), the soundproofing / damping sheet 11 has an adhesive surface 11a coated on the sticking surface, peels off the release paper 11b, and sticks on the inner surface 4b of the dash panel 4. Attached. The silencer material 6 is attached to the inner surface 4 b of the dash panel 4 after the soundproofing / vibration sheet 11 is attached. As a result, the outer periphery of the soundproofing / damping sheet 11 overlaps the outer periphery of the mounting hole 6a of the silencer member 6.

The soundproofing / damping material 11 is conventionally used by being attached to a roof panel or the like as a damping material for an outer panel of an automobile, and has a vibration damping characteristic shown in FIG. In addition, it has a wide temperature range and is lightweight.

On the other hand, the wire harness W / H is penetrated through the grommet 10, and the outer circumference of the wire insertion portion 10a of the grommet 10 and the outer circumference of the wire harness W / H are fixed by winding a tape 12 at a predetermined position. In this state, a sealant 13 and a sound insulating material 14 made of urethane foam are loaded inside the vehicle body mounting portion 4b for soundproofing. The sealing agent 13
Is a two-part curable material and is filled so that there is no gap between the inner peripheral surface of the vehicle body mounting portion 4b of the grommet 4 and the wire harness W / H. After the sealing agent 13 is filled and hardened, the sound insulating material 14 is press-fitted from the opening side of the vehicle body mounting portion 4b and loaded into the vehicle body mounting portion 4b.

The wire harness W / H and the grommet 1
When assembling 0 into the dash panel 4, the wire harness W / H is penetrated through the through hole 4x of the dash panel 4, and the grommet 10 is passed from the silencer member 6 side. The grommet 10 has a locking projection 10d of the large diameter portion 10f.
Is brought into contact with the outer surface 4a of the dash panel 4, and the lip 10e for locking the vehicle body of the flange portion 10c is brought into contact with the soundproof / vibration sheet 11.

In the structure of the first embodiment, the dash panel 4 has a through hole 4x formed in the inner surface 4b on the vehicle interior side, around the through hole 4x.
Since the soundproofing / vibration sheet 11 covering the entire area not surrounded by the silencer material 6 is attached, engine vibration sound transmitted from the dash panel 4 around the grommet 10 without the silencer material 6 into the vehicle interior 3 is generated. It will be effectively suppressed. In particular, by overlapping the outer periphery of the soundproofing / damping sheet 11 with the silencer material 6, no gap is created between the soundproofing / vibration sheet 11 and the silencer material 6, so that vibration noise and the like can be more effectively suppressed.

Further, the vehicle body mounting portion 1 of the grommet 10
Since the sound insulating material 14 is fitted in the inside of 0b and the sealing agent 13 having a soundproof effect is filled therein, the grommet 10
Vibrational noises and the like that penetrate the inside are also effectively suppressed. Thus, the soundproofing / damping sheet 11, the sound insulating material 14, and the sealant 13 cooperate to completely suppress the sound transmitted around the grommet 10 and inside the grommet 10.

FIG. 3 shows the outer surface 4 of the dash panel 4 of the vehicle.
Grommet 1 of the second embodiment attached to a with a bolt
The soundproof structure of 0'is shown.

The grommet 10 'is provided with an electric wire insertion portion 10a' having a small diameter and a vehicle body mounting portion 10b ', and an open end of the vehicle body mounting portion 10b' is projected in the outer peripheral direction to form an outer surface 4a of the vehicle body panel 4. Lip 10 for locking the vehicle body to be brought into contact with the side
A flange portion 10c 'having e'is provided. The outer surface of the grommet 10 'is covered with a metal cover 24, and the grommet 10 is covered with bolts and nuts 15 penetrating the cover 24, the flange portion 10c' and the dash panel 4.
B'is attached to the dash panel 4.

In the second embodiment, the soundproof / vibration damping sheet 11 is used.
Is attached to the outer surface 4a side of the dash panel 4. The soundproofing / damping sheet 11 is provided at a portion where the silencer member 6 is not attached to the inner surface 4b of the dash panel, that is, between the through hole 4c and the mounting hole 6a, and a part of the silencer member 6 and the dash panel 4. It is attached at the overlapping position.

Also in the second embodiment, the grommet 1
The inside of 0'is filled with the sealing agent 13 and also loaded with the sound insulating material 14. In each of the first and second embodiments, the sealing agent 13 and the sound insulating material 14 are attached to the inside of the grommet, but it is not always necessary to attach them, and it is sufficient to attach the soundproofing / vibration damping sheet 11. There are some cases.

The wire harness W / H and the grommet 1
When assembling 0 ′ to the dash panel 4, the wire harness W / H is penetrated through the through hole 4x of the dash panel 4, the flange portion 10c ′ covers the soundproofing / damping sheet 11, and The lip 10e 'is brought into contact with the outer surface 4a of the dash panel 4 and tightened with the bolts and nuts 15. As a result, the grommet 10 'is attached to the dash panel 4 with the bolts and nuts 15 together with the wire harness W / H.

According to the structure of the second embodiment, as in the first embodiment, the soundproofing / vibrating sheet 11 is attached around the through hole 4x of the outer surface 4a of the dash panel 4, so that the silencer is used. Engine vibration noise and the like that penetrates into the vehicle interior 3 from the dash panel 4 around the grommet 10 ′ that is not covered with the material 6 is effectively suppressed.

In the first embodiment, the soundproof / vibration damping sheet 1 is used.
1 is attached to the inner surface 4b side of the dash panel 4 and to the outer surface 4a side of the dash panel 4 in the second embodiment, respectively, it will be even better if the dash panel 4 is sandwiched between the inner surface 4b and the outer surface 4a. The soundproof effect of Further, it goes without saying that the invention is not limited to the dash panel and can be applied to a vehicle body panel in which a wire harness is inserted through a grommet.

[0032]

As is clear from the above description, the soundproof structure for the grommet of the present invention is applicable to both the grommet of the type fitted into the through hole of the vehicle body panel and the type of the grommet attached to the panel with bolts. The soundproofing / vibration sheet attached around the through hole of the vehicle body panel can effectively suppress engine vibration noise and the like that penetrates into the vehicle from the panel around the grommet which is not covered with the silencer material.

Further, by overlapping the outer periphery of the soundproofing / vibrating sheet with the soundproofing sheet, no gap is formed between the soundproofing sheet and the soundproofing sheet, and vibration noise can be suppressed more effectively.

Further, by fitting a sound insulation material such as urethane foam into the vehicle body mounting portion of the grommet and filling a sealant having a soundproof effect, it is possible to effectively suppress the vibration sound passing through the grommet, Together with the soundproofing / vibration suppressing sheet, the sound transmitted around the grommet and inside the grommet can be completely suppressed.

[Brief description of drawings]

FIG. 1A is a sectional view of a grommet soundproof structure according to a first embodiment of the present invention, and FIG. 1B is an enlarged sectional view of a main part of a soundproofing / vibration damping sheet.

FIG. 2 is a diagram showing a vibration damping characteristic of the soundproofing / vibration damping sheet.

FIG. 3 is a sectional view of a grommet soundproof structure according to a second embodiment.

FIG. 4 is a schematic diagram of a vehicle.

5A is a cross-sectional view of a conventional grommet soundproof structure, and FIGS. 5B and 5C are cross-sectional views showing a sound insulating effect of a sound insulating material.

FIG. 6 is a cross-sectional view showing a conventional problem.

[Explanation of symbols]

 W / H wire harness 1 vehicle 4 dash panel 4a engine room side outer surface 4b vehicle compartment side inner surface 4c through hole 6 silencer material 6a mounting hole 10, 10 'grommet 10a wire insertion portion 10b vehicle body mounting portion 10e vehicle body locking lip 11 Soundproofing / damping sheet 13 Sealant 14 Sound insulation material 15 Bolts / nuts 24 Metal cover

Claims (3)

[Claims] 1. A soundproof structure for a portion in which a wire harness penetrates through a through hole of a vehicle body panel via a grommet, wherein the inner surface and / or the outer surface on the vehicle interior side is at the periphery of the through hole of the vehicle body panel. The soundproofing / damping sheet is attached to the panel surface of the vehicle body, and the area not covered by the silencer material attached to the inner surface of the vehicle body panel on the passenger compartment side is covered with the soundproofing / damping sheet. Grommet soundproof structure. 2. The soundproofing / vibration damping sheet is overlapped with the silencer material, and a lip of a grommet for locking the vehicle body is pressed against the soundproofing / vibration damping sheet. Grommet soundproof structure. 3. The grommet is provided with a small-diameter electric wire insertion portion through which a wire harness closely contacts and penetrates, and has a diameter expanded from one end of the electric wire insertion portion, and the outer peripheral portion thereof is provided with the vehicle body locking lip. The vehicle body mounting portion into which the wire harness is loosely inserted is provided, and the vehicle body locking lip is locked to the inner surface side or the outer surface side of the vehicle body panel, while the vehicle body mounting portion is filled with a sealing agent for soundproofing. The soundproof structure of the grommet according to claim 1 or 2, which is provided.