JPH11341651A - Grommet silencing element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bend a wiring harness in a silencing element fitted in a grommet to bend the wiring harness sidewise without a large detour. SOLUTION: The entering hole 10a of a wiring harness W/H is formed at the center of the one end surface of a silencing element 10 made of foamed material with a strength, and the exit hole 10b of the wiring harness W/H is formed at a position offset from the center of the other end surface of the silencing element 10. Further, a through-hole 10c with which the entering hole 10a and the exit hole 10b are connected to each other is provided, and a slit 10d through which the through-hole 10c and the outer circumferential surface of the silencing element 10 are linked with each other is provided. After the wiring harness W/H is made to penetrate through a grommet 2, the silencing element 10 is attached to the wiring harness W/H with the slit 10d and fitted in the grommet 2 so as to have the direction of the sidewise bending of the wiring harness W/H same as the direction of the offset of the exit hole 10b. With this constitution, the wiring harness W/H can be bent sidewise without a large detour.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound deadening material mounted in a grommet, and more particularly, to a case where a wire harness penetrating the sound deadening material is bent inside the sound deadening material and a wiring direction is changed near an outlet of the sound deadening material. , So that the wire harness can be bent sideways without becoming large.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, in order to suppress the vibration noise of an engine which enters a vehicle compartment 8 and the like, a silencing material 1 made of foam is provided inside a large-diameter cylindrical portion 2a of a grommet 2. In some cases. The wire harness W / H penetrates the grommet 2 and the sound deadening material 1 locked to the vehicle body panel 3 and is routed to the vehicle compartment 8 and the engine room 9.

[0003] The wire harness W / H arranged in the cabin 8
Is limited because of limited wiring space,
Immediately after leaving b, the vehicle is laterally bent at an angle X of 90 degrees so as to be parallel to the vehicle body panel 3.
It is much larger than. Also, wire harness W /
Since the horizontal bending of H is performed with the outlet 1b of the sound deadening material 1 in contact with the inside of the horizontal bent portion M as a fulcrum, the void portion of the foam near the outlet 1b inside the horizontal bent portion M It is compressed and crushed, and the outlet 1b is provided outside the lateral bending portion M.
There is a possibility that a gap 4 is generated between the wire harness W / H and the wire harness W / H.

[0006] As another conventional example, as shown in FIG. 6, when the number of electric wires constituting the wire harness W / H is large and the rigidity of the wire harness W / H is further stronger, the sound damping material 1 is used.
When a 90-degree side bending is performed after exiting from the takeout opening 1b, the wiring direction is forcibly changed by winding and attaching the L-shaped bracket 5 together with the wire harness W / H with the adhesive tape 6.

[0005]

In order to change the wiring direction immediately after exiting the sound-muffling material take-out port, the lateral bending of the wire harness requires a large turn due to the rigidity of the wire harness. However, there is a problem that extra wiring space is required. In addition, the hole near the outlet of the sound deadening material is crushed inside the horizontal bent portion, and a gap is formed between the outlet and the wire harness outside the horizontal bent portion, thereby reducing the sound deadening effect. There is.

Furthermore, when the number of electric wires constituting the wire harness to be used is large, the rigidity of the wire harness is further increased, and unless the L-shaped bracket is attached, the wiring direction cannot be changed, and it takes time to attach. However, there is a problem that costs increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and utilizes a sound deadening material attached to the inside of an expanded cylindrical portion of a grommet to bend a wire harness penetrating the grommet inside the sound deadening material. It is an object to enable the wire harness to bend laterally without making a large turn.

[0008]

In order to solve the above-mentioned problems, according to the present invention, there is provided a small-diameter tubular portion closely fitted to a wire harness and a wire continuously connected to one end of the small-diameter tubular portion. A sound-absorbing material which is internally fitted to the enlarged-diameter tube portion of an elastomer or rubber grommet provided with an enlarged-diameter tube portion through which a harness penetrates; With an entrance in the center of
On the other end surface, an outlet is provided at a position offset from the center corresponding to the bending direction of the wire harness, and a through hole for inserting a wire harness that connects the entrance and the outlet is provided. We provide a grommet silencer that attaches to a grommet that does.

The sound deadening material is made of a material such as a foam having relatively rigidity and strength so that the wire harness is bent in the direction of the through hole of the sound deadening material. The diameter of the through-hole in the sound-absorbing material is made slightly smaller than the outer diameter of the wire harness, and the wire harness is attached to the through-hole by press-fitting, so there is a gap between the wire harness and the through-hole. It does not occur and enhances the silencing effect. When attaching the silencer to the grommet, the direction in which the wire harness is laterally bent and the direction in which the outlet of the silencer is offset are the same.

The grommet sound-absorbing material according to claim 1, wherein a slit is formed in the outer peripheral surface so as to communicate with the through hole for inserting the wire harness, and the wire harness can be inserted through the slit (claim 2). By providing the slit, the muffling material can be attached to the wire harness even after penetrating the wire harness through the grommet, so that the workability of attaching the muffling material is improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A shows a sound deadening material 10 of the present invention.
The silencing material 10 is made of strong, independent urethane foam, is molded with an outer diameter slightly larger than the inner diameter of the enlarged-diameter cylindrical portion 2a of the grommet 2, and peels off the release paper 7 on one end surface. And the adhesive-coated surface 10e is exposed. The reason why the outer diameter of the silencer 10 is made larger than the inner diameter of the grommet 2 is that when the silencer 10 is fitted inside the grommet 2, no gap is formed between the outer peripheral surface of the silencer 10 and the grommet 2. The reason why the pressure-sensitive adhesive applied surface 10e is provided is to prevent the sound deadening material 10 from being displaced in the grommet 2 due to vibration due to running of the vehicle body or the like.

As shown in FIG. 1B, an entrance 10a for a wire harness W / H is provided at the center of one end face of the sound deadening material 10, and a wire harness outlet 10b is provided at the other end face at a position offset from the center. Is provided, and an inclined through hole 10c communicating the entrance 10a and the outlet 10b is provided.
This inclination angle is determined by the wire harness W passing through the through hole 10c.
/ H is the entrance 10a and the exit 10b of the silencing material 10
Are bent at the angles Y and Z shown in FIG. 4 so that the relationship of Y + Z = 90 degrees is established.

As shown in FIG. 1 (C), the shape of the outlet 10b is an elliptical shape having a major axis length corresponding to the amount of offset from the center. The amount of offset is set so that the distance S between the outer periphery of the outlet 10b and the periphery of the end face is closest to each other is 5 mm. Also, the through hole 10c
Of the wire harness W / H to be used is 1 to
It is reduced by 3 mm so that no gap is generated when the wire harness W / H is attached. A slit 10d having an opening of 1 to 2 mm is provided on the outer peripheral surface of the sound deadening material 10 so as to communicate with the through hole 10c, so that the wire harness W / H can be inserted into the through hole 10c through the slit 10d.

The grommet 2 in which the silencer 10 is to be fitted has the same shape as that of the prior art, and is made of an elastomer or rubber.
A small-diameter tube portion 2b closely fitted to the wire harness, and the large-diameter tube portion 2a continuously penetrating the wire harness at one end of the small-diameter tube portion; A vehicle body locking recess 2c is provided.

When assembling the wire harness W / H, the grommet 2 and the muffler 10, first, as shown in FIG. 2, the wire harness W / H is inserted through the enlarged diameter cylindrical portion 2a of the grommet 2. Next, as shown in FIG. 3, the wire harness W / H is inserted into the through-hole 10c by widening the slit 10d such that the adhesive-applied surface 10f is on the grommet side, as shown in FIG. At this time, the direction in which the outlet 10b is offset is the same as the direction in which the wire harness W / H is bent laterally.

With the wire harness W / H inserted, the sound deadening material 10 is peeled off the release paper 7 and the adhesive applied surface 10e
As shown in FIG. 4, the pressure-sensitive adhesive is pressed into the inside of the enlarged-diameter cylindrical portion 2a of the grommet 2, and the adhesive-applied surface 10e is stuck to the opposing surface of the grommet 2 and securely attached.

As described above, in a state where the wire harness W / H is passed through the grommet 2 in which the sound deadening material 10 is fitted, FIG.
As shown in FIG. 5, the grommet 2 is passed through the through hole 3a of the vehicle body panel 3, and the locking concave portion 2c provided on the outer periphery of the enlarged diameter portion 2a of the grommet 2 is fitted and attached to the periphery of the through hole 3a.

Since the wire harness W / H projects obliquely from the outlet 10b of the grommet 10 in the cabin 8, the wire harness W / H is bent laterally by the angle Z, and Routed parallel to 3. The wire harness W / H is bent from the engine room side to the vehicle room side at two points of the entrance 10a and the exit 10b of the silencing material 10, and as described above, the bending angles Y and Z are
Since the relation of Y + Z = 90 degrees is established, the wire harness W / H is bent at 90 degrees.

As described above, the sound deadening material 1 inside the grommet 2
Since the wire harness is inclined at 90 ° by being inclined at 0, the wire harness W / H is not burdened as compared with the conventional example in which the wire harness W / H is bent at one place. , The wire harness W / H does not make a large turn. Further, even in the case where the number of electric wires constituting the wire harness W / H is large, by applying the present invention, it is possible to perform a lateral bending without a large turn without using an L-shaped bracket.

[0021]

As is clear from the above description, the use of the sound deadening material of the present invention makes it possible to change the wiring direction by bending the wire harness sideways immediately after coming out of the grommet in the cabin. Since it can be performed without making a large turn, the efficiency of the work of arranging the wire harness can be increased and the wiring space can be reduced. Further, since the above can be applied even when the number of electric wires constituting the wire harness is large, the L-shaped bracket used for lateral bending, and
Since the work of attaching the L-shaped bracket is not required, it is possible to reduce the wiring harness wiring work time and the cost.

Further, since the wire harness through hole of the sound deadening material is inclined in advance in the direction in which the wire harness is bent,
Even if the wire harness is laterally bent, the sound absorbing material on the inner peripheral side in the bending direction of the wire harness is not compressed, and no gap is generated between the sound absorbing material on the outer peripheral side and the inner peripheral surface of the grommet,
It can maintain the noise reduction effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sound deadening material according to the present invention, in which (A) is viewed from an entrance, (B) is a cross-sectional view cut along a slit surface, (C)
FIG. 3 is a plan view as viewed from an outlet.

FIG. 2 is a perspective view showing a state in which a wire harness penetrates a grommet.

FIG. 3 is a perspective view showing a state in which the silencing material of the present invention is attached to a wire harness by widening a slit.

FIG. 4 is a cross-sectional view showing a state in which the sound deadening material of the present invention is attached and the wire harness is laterally bent.

FIG. 5 is a cross-sectional view showing a state in which a conventional sound deadening material is attached and a wire harness is laterally bent.

FIG. 6 is a cross-sectional view showing a state in which a wire harness is laterally bent by attaching an L-shaped bracket with the conventional sound deadening material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 10 Silencer 1a, 10a Inlet 1b, 10b Outlet 1c, 10c Through-hole 2 Grommet 2a Large-diameter cylindrical part 2b Small-diameter cylindrical part 3 Car body panel 7 Release paper 8 Car room 9 Engine room 10d Slit 10e Adhesive coated surface L Ideal wiring line M Side bending part W / H Wire harness

Claims (2)

[Claims] 1. An elastomer or rubber grommet comprising a small-diameter tubular portion closely fitted to a wire harness and externally fitted thereto, and a large-diameter tubular portion continuously penetrating the wire harness at one end of the small-diameter tubular portion. A sound-absorbing material which is internally fitted to the enlarged-diameter tube portion, wherein an entrance is provided at the center of one end surface facing the small-diameter tube portion side when the grommet is internally fitted, and the other end surface is provided in the bending direction of the wire harness. A grommet sound-absorbing material attached to a grommet, characterized in that an outlet is provided at a position correspondingly offset from the center, and a through hole for inserting a wire harness connecting the entrance and the outlet is provided. 2. The sound deadening material for a grommet according to claim 1, wherein a slit is formed in the outer peripheral surface in communication with the through hole for inserting the wire harness, and the wire harness can be inserted through the slit.