JPH10252951A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which is sufficient in sound-proof effect even when an engine room is arranged on either side of a grommet body. SOLUTION: An insertion hole 7 for a wire harness is provided in a grommet body 2 to be fitted in a panel hole 11 of a vehicle, etc., a shielding wall part 6 having the outer diameter approximately equal to that of the grommet body is formed around an opening of the insertion hole, and a first sound-proof means 20A is formed on one side of the shielding wall part, and a second sound-proof means 20B is formed on the other side of the shielding wall part, respectively. The first sound-proof means 20A and the second sound-proof means 20B are arranged in a deviated condition from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet mounted in a panel hole of a vehicle or the like.

[0002]

2. Description of the Related Art Conventionally, a grommet is mounted in a panel hole of a vehicle or the like to prevent noise from an engine room from being transmitted to a driver's seat. Therefore, as a soundproofing means for preventing noise generated in the engine room from being transmitted to the driver's seat, a practically open flat panel as shown in FIGS.
A grommet disclosed in Japanese Utility Model Publication No. 7-5318 has been proposed.

In FIGS. 13 and 14, this grommet 31A has an annular groove 37 in a grommet main body 33 fitted into a panel hole 32a formed in a panel 32 of a vehicle or the like. An insertion portion 36 for passing a wire harness (not shown) is provided, and a soundproof means 35 is provided in a thickness direction by a shielding wall portion 34 around the insertion portion 36. The grommet 31A (31B, 31C) is fitted into the panel hole 32a such that the insertion portion 36 of the grommet main body 33 is on the engine room (not shown) side.

The soundproofing means 35 includes a plurality of projections 35a provided on the outer wall surface of the shielding wall portion 34, a plurality of ridge ribs 35b arranged and formed in the same diameter, (FIGS. 15 and 16), or the same diameter. It is a plurality of holes 35c (FIGS. 17 and 18) arranged and formed in a shape. By forming such a soundproofing means 35 on the grommet main body 33, the grommet 31 is provided.
The soundproofing effect of A (31B, 31C) is improved.

However, the insertion portion 36 of the shielding wall portion 34
Since the soundproof means 35 is formed only on the side, there is a possibility that the grommet 31A (31B, 31C) cannot be expected to have a sufficient soundproof effect. Further, the insertion portion 3 of the shielding wall portion 34
When the side opposite to the sixth side is the engine room side, there is a problem that the soundproofing effect of the grommet 31A (31B, 31C) can hardly be expected.

[0006]

SUMMARY OF THE INVENTION In view of the above, the present invention provides a grommet which has a sufficient soundproofing effect on the grommet and which has a soundproofing effect even if the engine room comes to either side of the grommet body. The purpose is to do.

[0007]

In order to achieve the above object, the present invention provides an insertion hole for a wire harness inside a grommet body to be mounted in a panel hole of a vehicle or the like, and has a grommet body substantially equivalent to the grommet body. A grommet in which a shielding wall having an outer diameter of about 3 mm is formed around the opening of the insertion hole, and the first soundproofing means is formed on one side of the shielding wall and the second soundproofing means is formed on the other side. (Claim 1). A grommet disposed on the shielding wall with the first soundproofing means and the second soundproofing means shifted from each other is also effective (claim 2).

According to the first aspect, the shielding wall portion having an outer diameter substantially equal to that of the grommet body and formed around the opening of the insertion hole has the first soundproofing means on one side and the second soundproofing means on the other side. Therefore, when the grommet main body is mounted in the panel hole, soundproofing in the vehicle can be maintained regardless of which side of the grommet main body faces the vehicle. According to the second aspect, since the arrangement positions of the first soundproofing means and the second soundproofing means formed on the shielding wall are shifted from each other, the first soundproofing means and the second soundproofing means are disposed on the opposite side of the shielding wall where the first soundproofing means is formed. The second soundproofing means is not located.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the conventional example, the same components are given the same names, and detailed description is omitted. FIGS. 1 and 2 show a first embodiment of a grommet according to the present invention. 1 and 2, the grommet 1A
Is formed with an annular groove 4 in the peripheral wall 3 of the grommet body 2 to be mounted in a panel hole 11 formed in a panel 10 of a vehicle or the like, and an insertion hole 7 through which a wire harness (not shown) is passed through the grommet body 2. And a shielding wall 6 having substantially the same outer diameter as the grommet main body 2 is formed around the opening of the insertion hole 7, and the soundproofing means 20 is formed in the thickness direction of the shielding wall 6.

The soundproofing means 20 comprises a first soundproofing means 20A formed on one surface 6a of the shielding wall 6, and a second soundproofing means 20B provided on the other surface 6b. First soundproofing means 2
Reference numeral 0A denotes a plurality of first mountain-shaped protrusions 22a which stand on the periphery of a concentric circle on one surface 6a of the shielding wall 6, and the second soundproofing means 20B extends on the periphery of the concentric circle on the other surface 6b of the shielding wall 6. Is a second mountain-shaped projection 21b standing upright.

The first mountain-shaped projection 21a and the second mountain-shaped projection 2
1b has the same shape. Also, the arrangement of the first mountain-shaped projections 21a and the second mountain-shaped projections 21b is the same, that is, the second mountain-shaped projections 21b are symmetrically arranged immediately below the first mountain-shaped projections 21a.

As a modification of the above, as shown in FIG. 3, a tube-shaped insertion portion 5 for fixing a wire harness from the periphery of the insertion hole 7 of the shielding wall portion 6 to the outside is provided. 6 can be projected to the one surface 6a side. Also,
As shown in FIG. 4, the insertion portion 5 ′ may be provided on the other surface 6 b of the shielding wall 6. Further, as shown in FIG.
It is also possible to protrude the insertion portions 5, 5 'on both sides of the one surface 6a side and the other surface 6b side, respectively.

Instead of arranging the second peak-shaped projection 21b directly below the first peak-shaped projection 21a, that is, as shown in FIG.
It is also possible to displace the arrangement position of b ′ and make the arrangement of both asymmetric. Also in this case, an insertion portion can be provided in the shielding wall portion 6 corresponding to FIGS.

FIGS. 7 and 8 show a second embodiment of the grommet according to the present invention. The same components as those in the first embodiment are given the same numbers and the same names, and detailed explanations are omitted. Also in the second embodiment, it is possible to provide an insertion portion as shown in FIGS. 3 to 5 of the first embodiment. 7 and 8, the grommet 1B is
The first soundproofing means 20A and the second soundproofing means 20B formed on the shielding wall 6 of the grommet main body 2 are provided with a plurality of annular ridges 24.
a (24b).

First soundproofing means 20A and second soundproofing means 20
B is a first annular ridge 24 standing on the same circumference.
a and the second annular ridge 24b, and the second annular ridge 24b is located directly below the first annular ridge 24a. That is, the first annular ridge 24 a and the second annular ridge 24 b are in a symmetrical positional relationship with respect to the shielding wall 6. As shown in FIG. 9, it is also possible to shift the positions of the first annular ridge 24a and the second annular ridge 24b ', that is, the second annular ridge 24b is located immediately below the first annular ridge 24a. 'Is not located.

FIGS. 10 and 11 show a third embodiment of the grommet according to the present invention. The same components as those in the first embodiment are given the same numbers and the same names, and detailed explanations are omitted. Also, in the third embodiment, it is possible to provide an insertion portion as shown in FIGS. 3 to 5 of the first embodiment. In FIGS. 10 and 11, the grommet 1C includes a first soundproofing means 20A formed on the shielding wall 6 of the grommet body 2 formed to be thicker than the first embodiment (second embodiment), and a second soundproofing. This is the case where the means 20B is a plurality of first soundproof holes 26a and second soundproof holes 26b.

The first soundproofing means 20A and the second soundproofing means 20
B is a first soundproof hole 26a standing on the same circumference.
And the second soundproof hole 26b.
The second soundproof hole 26b is located directly below the second soundproof hole 26b. The first soundproof hole 26a is formed from the one surface 6a of the shielding wall portion 6 toward the other surface 6b, and is arranged so as to be adjacent to the entire surface 6a substantially all around the small hole 27a, and the small hole 27a. A large hole 28a having a larger capacity than the small hole 27a is formed continuously with the small hole 27a. The same applies to the structure of the second soundproof hole 26b.

The first soundproof hole 26 is formed with respect to the shielding wall 6.
a and the second soundproof hole 26b are symmetrical positions. As shown in FIG. 12, the first soundproof hole 26a and the second soundproof hole 26
It is also possible to shift the position with b '. That is, the second soundproof hole 26b 'is not located directly below the first soundproof hole 26a'.

As described above, the first soundproofing means 20A and the second soundproofing means 20B are provided on one surface 6a and the other surface 6b of the shielding wall 6.
Are formed, so that a sufficient soundproofing effect can be obtained as compared with the related art. Further, the soundproofing effect of the grommet 1A (1B, 1C) does not decrease regardless of which side of the grommet main body 2 has the engine room (not shown).

As a result, the grommet 1 is
The work can be performed without considering which side of A (1B, 1C) is to be the engine room side, and the work of mounting the grommet main body 2 into the panel hole 11 becomes quick. Furthermore, when the arrangement locations of the first soundproofing means 20A and the second soundproofing means 20B are different, the soundproofing effect (shielding effect) of the noise from the engine room is further improved as compared with the case where the arrangement places are the same. In addition, the first soundproofing means 20A or (and)
The second soundproofing means 20B has a mountain-shaped protrusion 21a (21b), an annular ridge 24a (24b), and a soundproof hole 26a (26b).
Can all be mixed.

[0021]

As described above, according to the present invention, the first soundproofing means and the second soundproofing means are respectively formed on one side and the other side of the shielding wall of the grommet body. Compared to the grommet, the soundproofing effect of the grommet is further improved, and the grommet can be mounted in the panel hole from either side of the grommet body. This makes it easy to change in advance which side of the grommet is to be mounted in the panel hole. Further, since the second soundproofing means is not located symmetrically on the opposite side of the shield wall where the first soundproofing means is formed, the first soundproofing means and the second soundproofing means are symmetrically overlapped at the shielding wall. There is more soundproofing effect than in the case.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a first embodiment of a grommet according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a partial cross-sectional view showing a case where an insertion portion is provided on one surface side of a shielding wall portion.

FIG. 4 is a partial cross-sectional view showing a case where an insertion portion is provided on the other surface side of the shielding wall portion.

FIG. 5 is a partial cross-sectional view showing a case where insertion portions are provided on both sides of a shielding wall portion.

FIG. 6 is a partial cross-sectional view showing a case where the positions of the first mountain-shaped projection and the second mountain-shaped projection are different.

FIG. 7 is a partial sectional view showing a second embodiment of the grommet according to the present invention.

FIG. 8 is a front view of FIG. 7;

FIG. 9 is a partial sectional view showing a case where the positions of the first annular ridge and the second annular ridge are different.

FIG. 10 is a partial sectional view showing a third embodiment of the grommet according to the present invention.

FIG. 11 is a front view of FIG. 10;

FIG. 12 is a partial sectional view showing a case where the positions of the first soundproof hole and the second soundproof hole are different.

FIG. 13 is a partial sectional view showing a conventional grommet.

FIG. 14 is a front view of FIG.

FIG. 15 is a partial cross-sectional view showing another conventional grommet.

FIG. 16 is a front view of FIG.

FIG. 17 is a partial cross-sectional view showing another conventional grommet.

18 is a front view of FIG.

[Explanation of symbols]

 1A, 1B, 1C Grommet 2 Grommet body 6 Shielding wall 7 Insertion hole 20A First soundproofing means 20B Second soundproofing means

Claims (2)

[Claims] An insertion hole for a wire harness is provided inside a grommet body to be mounted in a panel hole of a vehicle or the like, and a shielding wall portion having an outer diameter substantially equal to that of the grommet body is provided around an opening of the insertion hole. A grommet, wherein a first soundproofing means is formed on one side of the shielding wall and a second soundproofing means is formed on the other side. 2. The grommet according to claim 1, wherein the first soundproofing means and the second soundproofing means are arranged on the shielding wall in a mutually shifted state.