JP2002044839A - Silencer for grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate noise by making no displacement at the silencer slit position for the grommet even the wire harness vibrates in a running car and preventing the silencer from colliding with the grommet even if it shifts at the slit position. SOLUTION: The grommet silencer 1 is attached on the cabin side surface of a grommet 10 fitted in a through hole on the wall partitioning the engine room and the cabin to retain the wire harness 11. It consists of two layers of a cylindrical sound absorber foam 2 and a sound shield disk 3 adhered each other with a first slit 7 extending from the center to the outer periphery on the above sound absorber and a second slit 8 extending from the center to the outer periphery on the sound shield 3. Both slits are positioned staggering each other to retain a wire harness 11 between them by opening and closing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet silencer in which a wire harness equipped with a grommet reduces the noise generated by hitting the grommet or silences the grommet. The present invention relates to a grommet silencer that does not emit noise.

[0002]

2. Description of the Related Art Generally, when laying out a wire harness from an engine room side of an automobile to a room side, a grommet is attached to the wire harness and attached to a partition panel that separates the engine room from the room.
This grommet generally has a configuration as shown in FIG. In other words, the grommet 10 is a cylindrical electric wire insertion portion 12 through which the wire harness 11 is inserted.
A bulging portion 13 is formed at one end of the electric wire insertion portion 12 so as to bulge outwardly from the end of the electric wire insertion portion 12 in a trumpet shape. Is formed. The annular end 15 around the periphery of the opening 14 on the maximum diameter side of the bulging portion 13 is formed as a flat surface. Although not shown, for example, a groove is formed on the outer peripheral surface of the bulging portion 13 so as to fit into a mounting hole formed in a partition panel for separating an engine room and a room of an automobile.

[0003] Using such a grommet 10, the grommet 10 is attached to a wire harness 11 and attached to a partition panel that separates an engine room from a room, and the wire harness is routed from the engine room side of the automobile to the room side. Is performed. When this grommet 10 is used, the vibration caused by the running of the automobile is transmitted to the wire harness 11 attached to the wire insertion portion 12 of the grommet 10, and the wire harness 11 hits the bulging portion 13 of the grommet 10 and generates noise. Therefore, in recent years, in order to eliminate this noise, grommet 1
In some cases, a silencer (silencer) is attached to the annular end 15 of the periphery of the opening 14 of the zero bulge 13.

[0004] Conventionally, this grommet silencer has been
It has a configuration as shown in FIG. That is, the grommet silencer 20 is a cylindrical foam (for example,
A sound absorbing material 21 made of urethane resin);
A sound insulating material 22 formed in the shape of a donut made of vinyl chloride resin is adhered so as to cover one surface of the sound absorbing material, and has a two-layer structure of a sound absorbing material 21 and a sound insulating material 22. A center hole 23 formed at the center of the grommet silencer 20
Is equipped with a wire harness (W / H) 11.

[0005] A sound insulating material 22 having a center hole 23 formed therein.
The inner end 24 corresponding to the center hole 23 side of the
Harness mounting tongue piece 2 formed by cutting and raising from the center of
5 are formed. This harness mounting tongue piece 25 is
The wire harness (W / H) 11 is attached to the center hole 23 of the grommet silencer 20, and the grommet silencer 20 is attached and fixed to the wire harness (W / H) 11. The harness mounting tongue piece 25 is in a raised state in FIG. 5, but is normally cut out at the center of the sound insulating material 22.

The sound absorbing member 21 of the grommet silencer 20 is provided with a slit 26 cut from the outer peripheral surface to the center hole 23. Furthermore, sound insulation material 2
2 is provided with a slit 27 cut from the outer peripheral surface to the center hole 23 at the same position as the slit 26 formed in the sound absorbing material 21.

[0007] The wire harness 11 is attached to the grommet 10 and the grommet silencer 20 by passing the wire harness 11 through the wire insertion portion 12 of the grommet 10 as shown in FIG. 4 and then connecting the grommet silencer 20 to the wire harness. 11 is installed from the direction perpendicular to the axis. That is, first, the slit 26 formed in the sound absorbing material 21 of the grommet silencer 20 and the slit 27 formed in the sound insulating material 22 of the grommet silencer 20 are attached in the direction of opening as shown by arrows A and B in FIG. Open up. After a while, this open slit 2
6. Pass the wire harness 11 from between the slits 27 and insert the wire harness 11 into the center hole 23. Then, the slit 26 formed in the sound absorbing material 21 of the grommet silencer 20 and the grommet silencer 20 are formed.
The slit 27 formed in the sound insulating material 22 is closed by releasing the bias in the opening direction.

FIG. 7 shows a state in which the wire harness 11 is attached to the grommet 10 and the grommet silencer 20 in this manner.

[0009]

In such a conventional silencer for a grommet, a wire harness 1 is provided.
1, a slit 26 formed in the sound absorbing material 21 of the grommet silencer 20 formed to insert the wire harness 11 into the center hole 23 of the grommet silencer 20, and a slit formed in the sound insulating material 22 of the grommet silencer 20. 27 is cut at the same position from the outer peripheral surface to the center hole 23,
When the wire harness 11 vibrates as the vehicle travels, there is a problem that the vibration easily shifts at the positions where the slits 26 and 27 are formed.

Further, in the conventional grommet silencer, the sound absorbing material 2 of the grommet silencer 20 is used.
1 and the slit 27 formed in the sound insulating material 22 of the grommet silencer 20 are cut at the same position from the outer peripheral surface to the center hole 23. There is a problem that the sound absorbing material 21 and the sound insulating material 22 adhered to each other of the silencer 20 are displaced at the positions where the slits 26 and 27 are formed, and the grommet silencer 20 hits the grommet 10 and generates noise in accordance with the traveling of the automobile. I have.

It is an object of the present invention to provide a grommet silencer in which slits are not formed even when the wire harness vibrates as the vehicle travels. The purpose of this is to eliminate the noise of the grommet silencer for the grommet due to the misalignment.

[0012]

In order to achieve the above object, a grommet silencer according to claim 1 of the present application is mounted on a wire harness arranged from an engine room side of a car to a room side, and is connected to an engine room and a room. A grommet silencer attached to a wire harness in contact with the indoor side end surface of a grommet that holds a wire harness by being attached to a through hole of a partition panel of the grommet, wherein the sound absorbing material is formed by forming a foam into a cylindrical shape; A two-layer structure in which a plate-shaped sound insulating material is bonded to the surface of the material, a first slit extending from the center to the outer peripheral surface in the sound absorbing material, and a second slit extending from the center to the outer peripheral surface in the sound insulating material Is provided at a position different from the position where the first slit is formed, and is opened and closed at the positions of the first slit and the second slit. Those configured to be worn. With this configuration, claim 1 of the present application is provided.
According to the invention described in the above, even if the wire harness vibrates with the running of the car, there is no displacement at the slit forming position of the grommet silencer even when the car runs, and the gap does not occur at the slit forming position of the grommet silencer even when the car runs. The grommet silencer can be prevented from hitting the grommet and no noise is generated.

In order to achieve the above object, a grommet silencer according to a second aspect of the present invention provides a wire harness having a sound absorbing material and a sound insulating material that are not bonded to each other between a first slit and a second slit. After mounting, when the grommet silencer is closed, the sound insulating material is configured to overlap the sound absorbing material. With this configuration, according to the invention as set forth in claim 2 of the present application, even when the wire harness vibrates as the vehicle travels, it is possible to reliably suppress the occurrence of a displacement at the slit forming position of the grommet silencer. it can.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a grommet silencer according to the present invention will be described. FIG. 1 shows an embodiment of a grommet silencer according to the present invention.

In FIG. 1, reference numeral 1 denotes a grommet silencer. The grommet silencer 1 is a sound absorbing material 2 made of a cylindrical foam (for example, urethane resin).
And a sound insulating material 3 formed in the shape of a donut made of vinyl chloride resin so as to cover one surface of the sound absorbing material 2,
It has a two-layer structure of a sound absorbing material 2 and a sound insulating material 3. A center hole 4 formed at the center of the grommet silencer 1 is adapted to mount a wire harness (W / H) 11.

A harness mounting tongue piece 6 cut out from the center of the sound insulating material 3 is formed at an inner end 5 of the sound insulating material 3 where the center hole 4 is formed. . The tongue piece 6 for attaching a harness is provided in the center hole 4 of the grommet silencer 1 with a wire harness (W / H).
11 is for attaching and fixing the grommet silencer 1 to the wire harness (W / H) 11. Although the harness mounting tongue piece 6 is in the raised state in FIG. 1, it is usually formed in a state cut out at the center of the sound insulating material 4. The tongue piece 6 for attaching a harness is raised when the wire harness (W / H) 11 is attached to the center hole 4 formed at the center of the grommet silencer 1 and attached to the center hole 4 of the grommet silencer 1. Along with the wire harness (W / H) 11, the tongue piece 6 for attaching the harness is connected to the wire harness (W / H).
H) Attach and fix by winding tape around 11.

Further, the sound absorbing material 2 of the grommet silencer 1 is provided with a slit 7 cut from the outer peripheral surface to the center hole 4. Further, the sound insulating material 3 is provided with a slit 8 cut from the outer peripheral surface to the center hole 5 at a position different from the slit 7 formed in the sound absorbing material 2. That is, the slit 7 formed in the sound absorbing material 2
The slit 8 formed in the sound insulating material 3 is formed at a shifted position. Then, the shifted portion forms a lap margin L. That is, the grommet silencer 1 has a two-layer structure in which the sound absorbing material 2 and the sound insulating material 3 are adhered to each other, but as shown in FIG. The sound absorbing material 2 and the sound insulating material 3 are not attached to the lap allowance L up to the position of the slit 8 formed in FIG.

In FIG. 2, the grommet silencer 1 is open at the slit forming portion. However, when the slit forming portion of the grommet silencer 1 is closed, as shown in FIG. The open portion 3A of the sound insulating material 3 to which the sound absorbing material 2 is not bonded is covered by the open portion 2A to which the sound insulating material 3 is not bonded, and the sound insulating material 3 holds down the sound absorbing material 2. Accordingly, the position of the slit 7 formed in the sound absorbing material 2 is regulated by the sound absorbing material 2, and the sound absorbing material 2 is prevented from shifting at the position of the slit 7 formed in the sound absorbing material 2. Can be.

The grommet silencer 1 constructed as described above and the wiring harness 11 are attached to the grommet 10 shown in FIG. 4 by passing the wire harness 11 through the wire insertion portion 12 of the grommet 10 as shown in FIG. After that, the grommet silencer 1 is attached from the direction perpendicular to the axis of the wire harness 11. That is, first, the center hole 4 of the sound insulating material 3 of the grommet silencer 1
Raise the harness mounting tongue piece 6 formed on the inner end 5 corresponding to the side. Then, the slits 7 formed in the sound absorbing material 2 of the grommet silencer 1 and the slits 8 formed in the sound insulating material 3 of the grommet silencer 1 are urged in the opening directions as shown by arrows C and D in FIG. Open as shown in FIG. Thereafter, the wire harness 11 is passed through the space between the opened slits 7 and 8 and the wire harness 11 is inserted into the center hole 4. After that, the opening of the slit 7 formed in the sound absorbing material 2 of the grommet silencer 1 and the slit 8 formed in the sound insulating material 3 of the grommet silencer 1 are released, and the slit of the grommet silencer 1 is opened. The part closes.

Further, the raised harness mounting tongue piece 6
Is attached to the wire harness (W / H) 11 attached to the center hole 4 of the grommet silencer 1, and the wire harness (W / H) 11 is attached and fixed to the harness attaching tongue piece 6 by tape winding. FIG. 3 shows a state in which the wire harness 11 is attached to the grommet 10 and the grommet silencer 1 in this manner.

Therefore, according to the present embodiment, the slit formed in the sound absorbing material 2 of the grommet silencer 1 formed for inserting the wire harness 11 into the center hole 4 of the grommet silencer 1 through the wire harness 11. 7 and the slit 8 formed in the sound insulating material 3 of the grommet silencer 1 are cut from the outer peripheral surface to the center hole 4 with a lap margin L, so that the wire harness 11 vibrates as the automobile runs. Even so, the joint of the slit 7 formed in the sound absorbing material 2 of the grommet silencer 1 is pressed by the sound insulating material 3 of the grommet silencer 1, and it is possible to prevent the formation position of the slit from being shifted by this vibration.

Further, according to the present embodiment, the slit formed in the sound absorbing material 2 of the grommet silencer 1 formed for inserting the wire harness 11 into the center hole 4 of the grommet silencer 1 through the wire harness 11. 7 and the slit 8 formed in the sound insulating material 3 of the grommet silencer 1 are cut from the outer peripheral surface to the center hole 4 with a lap margin L, so that the grommet silencer 1 can be moved by the automobile.
Is not displaced at the positions where the slits 7 and 8 are formed, and the grommet silencer does not hit the grommet in accordance with the running of the vehicle, so that noise can be prevented.

[0023]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, even if the wire harness vibrates as the vehicle travels, no displacement occurs at the slit forming position of the grommet silencer, and the grommet is used even when the vehicle travels. At the slit forming position of the silencer, the grommet can be prevented from hitting the grommet due to misalignment, so that no noise is generated.

According to the second aspect of the present invention, even if the wire harness vibrates as the automobile travels, it is possible to reliably prevent the gap from being generated at the slit forming position of the grommet silencer.

[Brief description of the drawings]

FIG. 1 is an overall configuration perspective view showing an embodiment of a grommet silencer according to the present invention.

FIG. 2 is a view showing a state in which a slit portion of the grommet silencer is opened when a wire harness is attached to the grommet silencer shown in FIG.

FIG. 3 is a view showing a state where a wire harness is attached to the grommet silencer and the grommet shown in FIG. 1;

FIG. 4 is an overall configuration diagram of a grommet.

FIG. 5 is a perspective view showing the entire structure of a conventional grommet silencer.

6 is a view showing a state in which a slit portion of the conventional grommet silencer is opened when a wire harness is attached to the conventional grommet silencer shown in FIG.

7 is a diagram showing a state in which a wire harness is attached to the conventional grommet silencer and the grommet shown in FIG.

[Explanation of symbols]

 1. Silencer for grommet 2. Sound absorbing material 3. Sound insulating material 4. Center hole 6. Harness Mounting tongue 7 Slit 8 Slit 8 Slit 10 Grommet 11 Wire harness

Claims (2)

[Claims] 1. A grommet which is attached to a wire harness which is routed from an engine room side of a car to a room and which is attached to a through-hole of a partition panel between the engine room and the room to contact a grommet holding a wire harness with the indoor side end surface. A grommet silencer to be attached to a wire harness, which has a two-layer structure in which a foamed material is formed into a cylindrical shape, and a plate-shaped sound insulating material is attached to the surface of the sound absorbing material. And a second slit extending from the center to the outer peripheral surface of the sound insulating material.
Wherein a slit is provided at a position different from a position where the first slit is formed, and a wire harness is mounted by opening and closing at the positions of the first slit and the second slit. . When the grommet silencer is closed after the wire harness is attached without attaching the sound absorbing material and the sound insulating material between the first slit and the second slit, The silencer for a grommet according to claim 1, wherein a sound insulating material is configured to overlap with the sound absorbing material.