JPH1146427A - Silencer for grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance sound insulation performance of a silencer. SOLUTION: A two-layer structure in which a resin skin 2b is adhered to a surface of a cylindrical sound absorption material 2a is provided. A slit 2c is cut out at a center from an outer periphery. A plurality of tongue pieces 6 for radially mounting a wire harness are formed at a center 2d on the skin 2b, and fixed to the wire harness W/H by tape winding. Thus, positional deviation generated from a slit position can be prevented. When mounted on a vehicle, a skin 5 of a sound insulation material 4 mounted at an indoor (Y) side of a partition panel 3 is abutted against an outer periphery 2f of the material 2a. Thus, even when a tensile force is loaded to the (Y) side to the harness W/H so that the silencer 2 is moved to the indoor (Y) side, the skin 5 of the material 4 mounted at the (Y) side of the panel 3 can be abutted against the outer periphery 2f of the material 2a to reduce noise transmitted to the (Y) side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet silencer, and more particularly, to a grommet which is mounted on a wire harness which is inserted into a through hole in a partition panel between an automobile room and an engine room to reduce noise on the engine room side. The purpose of the present invention is to reduce the transmission to the indoor side, and in particular, to prevent the silencer from being displaced so that no gap is formed between the silencer and the grommet.

[0002]

2. Description of the Related Art As shown in FIG. 4, a grommet 1 is attached to a wire harness W / H that is routed from an engine room (X) to a room (Y) of an automobile, and a partition panel 3 for separating the engine room from the room. In the through hole 3a to prevent water from entering the room.

Further, in order to reduce or prevent transmission of noise from the engine room (X) to the room (Y), a grommet 1 located on the room (Y) side has
The silencer 20 may be attached.

As shown in FIG. 4B, the silencer 20 has a two-layer structure in which a vinyl chloride skin 20b is adhered to a surface of a cylindrical sound absorbing material 20a, and the sound absorbing material 20a and the skin 20b are formed. Is provided with a slit 20d reaching the center hole 20c from the outer periphery. In addition, the epidermis 20b
The tongue piece 20e for attachment is formed by cutting and raising from the center of.

[0005] As shown in FIG. 5A, such a silencer 20 is attached to the wire harness W / H after the grommet 1 is attached to the wire harness W / H.
As shown in (B), the sound absorbing material 20a of the silencer 20
The silencer 20 is connected to the wire harness W / in a state where the end face 20f of the grommet 1 is in contact with the end face 1e of the grommet 1 without any gap.
H is attached. After opening the slit 20d and inserting the wire harness W / H through the center hole 20c, the silencer 20 attaches the mounting tongue piece 20e formed by cutting and raising from the center of the skin 20b to the wire harness W / H with a tape 7.
It is wrapped around and fixed.

[0006] After the wire harness W / H to which the grommet 1 and the silencer 20 are attached is once passed through the through hole 3a of the partition panel 3 from the engine room (X) side to the room (Y) side, as shown in FIG. As shown in FIG.
By pulling back to the engine room (X) side, FIG.
As shown in the figure, the grommet 1 is inserted into the through hole 3 of the partition panel 3.
a. In this state, the vinyl chloride skin 5 on the surface of the sound insulating material 4 made of urethane adhered to the room (Y) side of the partition panel 3 comes into contact with the vinyl chloride skin 20b of the silencer 20 to eliminate the gap. The noise in the engine room (X) is shielded.

[0007]

SUMMARY OF THE INVENTION The above silencer 20
Tongue piece 2 for fixing wire to wire harness W / H
0e is cut and raised at a position approximately 90 degrees apart from the position divided by the slit 20d, so that the mounting tongue piece 20e can be wound around the wire harness W / H with the tape 7, It is in the state of being held and supported, and misalignment is likely to occur on the other side across the slit 20d.

In particular, when the wiring harness W / H is inserted from the engine room (X) into the room (Y) and routed,
Since the silencer 20 and the grommet 1 pass through the through hole 3a by force, the misalignment is likely to occur.

Further, in the silencer 20, the epidermis 2
0b, the skin 5 of the partition panel 3 on the indoor (Y) side is slightly overlapped to eliminate the gap, so that the thickness Q of the sound absorbing material 20a of the silencer 20 is slightly smaller than that of the skin 5 of the partition panel 3 in the room ( It is thin and protrudes to the Y) side. Therefore, as shown in FIG. 6, when a downward pulling force (arrow P) is applied to the wire harness W / H on the indoor (Y) side, for example, the partition panel 3 starts from the upper end of the skin 20b of the silencer 20. There is a risk that the outer skin 5 may be easily detached, and also in this case, there is a possibility that a positional shift across the slit 20d may occur similarly to the above.

As described above, if the silencer 20 is displaced across the slit 20d or a tensile force is applied to the wire harness W / H, a gap C1 is generated between the silencer 20 and the grommet 1. At the same time, a gap C2 is generated between the silencer 20 and the skin 7 attached to the interior (Y) side of the partition panel 3. Thus, when the gaps C1 and C2 occur, the gaps C1 and C2
The noise of the engine room (X) is transmitted through the vehicle to the room (Y), the sound insulation effect is reduced, and the function of the silencer is not performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and prevents a displacement of a silencer from occurring to enhance a sound insulation effect without generating a gap between a grommet and a skin on the inner surface side of a partition panel. Further, an object of the present invention is to provide a grommet silencer that can obtain a sound insulating effect even when a tensile force is applied to a wire harness.

[0012]

In order to solve the above-mentioned problems, the present invention is directed to claim 1, which is attached to a wire harness which is routed from an engine room side of an automobile to a room side. A grommet silencer attached to the wire harness in contact with the indoor side end surface of the grommet attached to the through hole of the partition panel,
A two-layer structure in which a resin-made skin is adhered to the surface of a sound-absorbing material made of a cylindrical foam, and a slit for attaching a wire harness is cut from the outer peripheral surface to the center and provided continuously to the sound-absorbing material and the skin. In addition, the grommet silencer has a configuration in which a plurality of cuts are radially provided in the center of the skin to form a plurality of tongues for attaching a wire harness, and the tongues are fixed to the wire harness by tape winding. Is provided.

As described above, a plurality of tongues are radially provided at the center of the epidermis of the silencer, and these tongues are fixed to the wire harness by tape winding, thereby preventing the displacement from occurring from the slit position. Can be. Therefore, the silencer can be brought into contact with the surface of the sound insulating material attached to the interior side of the grommet and the partition panel without any gap,
Noise transmitted from the engine room side to the room side can be reduced.

Further, the silencer is attached to the wire harness in contact with the indoor end surface of the grommet, and when the grommet with the silencer is mounted in the through hole of the partition panel, the silencer protrudes to the indoor side. The skin of the sound insulating material attached to the interior side of the partition panel comes into contact. Accordingly, even if a pulling force is applied to the wire harness toward the indoor side, no displacement occurs in the silencer, and even if the silencer follows the wire harness and moves to the indoor side, the outer peripheral surface of the sound absorbing material In addition, the skin of the sound insulating material attached to the interior side of the partition panel can be brought into contact with no gap, so that noise transmitted from the engine room side to the interior side can be reduced.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the grommet 1 made of an elastomer has a conical cylindrical enlarged portion 1 b continuous from a small-diameter cylindrical portion 1 a that closely fits the outer periphery of the wire group of the wire harness W / H, and The vehicle body locking groove 1c is recessed on the outer peripheral surface. The annular end surface 1e on the periphery of the opening 1d on the maximum diameter side of the enlarged diameter portion 1b is a flat surface.

The silencer 2 is mounted so as to contact the annular end face 1e of the grommet 1.
The silencer 2 has a skin 2 made of a vinyl chloride resin sheet on the surface of a cylindrical sound absorbing material 2a made of urethane foam.
b has a two-layered structure. The sound absorbing material 2a is made up of the skin 5 of the sound insulating material 4 attached to the indoor side (Y) of the partition panel 3.
It has a thickness W that protrudes significantly to the indoor side X more than that. The center hole 2d of the sound absorbing material 2a is connected to the wire harness W.
/ H is set to a size that closely fits. Also, the outer peripheral surface 2
One slit 2c is formed by cutting from f to the center hole 2d.

The outer skin 2b has a slit 2c cut from the outer peripheral surface 2f at the same position as the slit 2c of the sound absorbing material 2a. Further, at the center position corresponding to the center hole of the sound absorbing material 2a, a plurality of angled cuts are provided radially to form a plurality of angled tongue pieces 6 for attaching a wire harness.

As shown in FIG. 2A, the wire harness W / H is attached to the grommet 1 and the silencer 2 after the wire harness W / H is passed through the grommet 1 as shown in FIG. 2B. As described above, the silencer 2 is attached from the direction perpendicular to the axis of the wire harness W / H. That is, as shown in FIG. 1C, the slit 2c is opened, and the wire harness W / H is inserted into the center hole 2d.

With the end surface 2e of the sound absorbing material 2 in contact with the annular end surface 1e of the grommet 1, the tongue piece 6 of the skin 2b is placed along the outer peripheral surface so as to surround the wire harness W / H, and the tape 7 is wound. Thus, the silencer 2 is fixed to the wire harness W / H (see FIG. 1D).

After the wire harness W / H to which the grommet 1 and the silencer 2 are attached is once passed through the through hole 3a of the partition panel 3 from the engine room (X) side to the room (Y) side, as shown in FIG. As shown in FIG. 2C, the grommet 1 is pulled back to the engine room (X) side, and as shown in FIG.
To lock. In this state, the skin 5 made of vinyl chloride on the surface of the sound insulating material 4 made of urethane adhered to the room (Y) side of the partition panel 3 comes into contact with the outer peripheral surface 2f of the sound absorbing material 2a of the silencer 2 to form a gap. I have lost it.

Since the tongue 6 of the skin 2b is fixed to the wire harness W / H along the outer peripheral surface so as to surround the wire harness W / H, the two sides separated by the slit 2c No displacement occurs, and no gap is generated between the end surface 2e of the sound absorbing material 2a and the grommet 1.

Also, when the wiring harness W / H is subjected to, for example, a downward pulling force (arrow P) from the room (Y) side as shown in FIG.
The silencer 2 moves to the room (Y) side following the wire harness W / H without any displacement of the silencer 2.

As described above, even when the silencer 2 moves toward the room (Y), the sound absorbing material 2a of the silencer 2 has a thickness W that protrudes significantly toward the room, and therefore the outer peripheral surface 2f of the sound absorbing material 2a. Further, the skin 5 of the sound insulating material 4 attached to the room (Y) side of the partition panel 3 can be brought into contact with no gap. Thus, noise transmitted from the engine room (X) side to the room (Y) side can be reduced. Since no gap is generated in this way, transmission of noise from the engine room (X) side to the room (Y) side can be reduced.

[0024]

As is clear from the above description, in the grommet silencer according to the present invention, a plurality of tongues are radially provided at the center of the skin of the silencer, and the tongues are fixed to a wire harness by tape winding. Therefore, it is possible to prevent both sides separated by the slit from being displaced.

Further, when the silencer is mounted on the vehicle, the outer surface of the silencer projecting into the cabin is brought into contact with the skin of the sound insulating material mounted on the cabin side of the partition panel of the vehicle. Accordingly, even if the wire harness is loaded with a pulling force toward the indoor side and the silencer moves toward the indoor side, the skin of the sound insulating material attached to the indoor side of the partition panel on the outer peripheral surface of the sound absorbing material without a gap. Can be abutted. Therefore, it is possible to reduce or prevent transmission of the noise in the engine room to the room side, and it is possible to enhance the sound insulation performance.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention, in which FIG. 1A is a cross-sectional view of a grommet with a silencer attached to an automobile, FIG. 1B is a perspective view of the silencer, and FIGS. 1C and 1D are attached to a wire harness. It is a perspective view of the silencer which was made.

FIG. 2 shows an embodiment of the present invention, wherein (A), (B),
(C), (D) is a process drawing which attaches a silencer and a grommet to a wire harness and a vehicle.

FIG. 3 shows the embodiment of the present invention and is a cross-sectional view in a state where a tensile force is applied to the wire harness.

4A and 4B show a conventional example, in which FIG. 4A is a cross-sectional view of a state in which a grommet with a silencer is attached to an automobile, and FIG.

FIG. 5 shows a conventional example, in which (A), (B), (C),
(D) is a process drawing of attaching a silencer and a grommet to a wire harness and a vehicle.

FIG. 6 is a cross-sectional view showing a conventional example in a state where a tensile force is applied to a wire harness.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet 2 Silencer 2a Sound absorbing material 2b Skin 2c Slit 2d Center hole 3 Partition panel 3a Through hole 6 Tongue piece for attaching wire harness 7 Tape W / H Wire harness X Engine room Y Room W Width of sound absorbing material

Claims (1)

[Claims] 1. A wire harness which is attached to a wire harness which is routed from an engine room side to a room side of an automobile and which comes into contact with a room side end surface of a grommet mounted in a through hole of a partition panel between the engine room and the room. A grommet silencer that can be attached, with a two-layer structure in which a resin-made skin is adhered to the surface of a sound-absorbing material made of a cylindrical foam, and a slit for attaching a wire harness connected to the sound-absorbing material and the skin. In addition to being cut from the surface to the center, a plurality of cuts are provided radially in the center of the skin to form a plurality of tongues for attaching a wire harness, and the tongues are fixed to the wire harness by tape winding. A grommet silencer with a configuration.