JP3085189B2 - Grommet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet for an automobile, and more particularly, to a grommet mounted on a wire harness penetrating a body panel or the like for partitioning an engine room from the interior of the vehicle. In the case of waterproofing, dustproofing, etc. by interposing, the sound insulation performance is also improved.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a grommet of this type has a small-diameter cylindrical reduced-diameter portion 1 made of rubber or an elastomer and is in close contact with the outer peripheral surface of a wire harness. It has a configuration in which the enlarged diameter portion 2 expanding in a conical tube shape is integrally formed. A wire harness W in which the wire group w is bundled with the tape T1 for the grommet 3
/ H, and is wound tightly around the outer peripheral surface of the reduced diameter portion 1 with a tape T2. Grommet 3
The wire harness W / H to which is attached is passed through the grommet 3 through the through hole 4a of the vehicle body panel 4 at the time of wiring to the automobile,
A locking recess 2a provided on the outer peripheral surface of the enlarged diameter portion 2 is locked and attached to the through hole 4a.

[0003]

The above-mentioned wire harness W
/ H is routed from the engine room side X to the room side Y, so that the grommet 3 once inserts the entire enlarged diameter portion 2 into the room side Y, then pulls it back to the engine room side X, and The stop recess 2a needs to be locked in the through hole 4a of the vehicle body panel 4. Therefore, the enlarged diameter portion 2 is bent and the through hole 4
a, the inclined portion 2b of the enlarged diameter portion 2 is made thin.

[0004] Therefore, an incident sound (shown by a solid arrow in the figure) including noise on the engine room X side is transmitted through the thin-walled enlarged portion 2 into the grommet 3, and the transmitted sound (shown by a dotted arrow in the figure). (Shown) enters the indoor side Y through the space S between the inner peripheral surface of the grommet 3 and the outer peripheral surface of the wire harness W / H inside the enlarged diameter portion 2 of the grommet 3. As described above, the conventional general grommet does not pay particular attention to the sound insulation performance, so that the sound insulation performance is low, the noise leaks from the wire harness insertion portion into the room, and the comfort performance in the vehicle interior is reduced. there were.

In order to improve the sound insulation performance, as shown in FIG. 6, a solid body 6 made of a rigid body is inserted into the inner space of the enlarged diameter portion 2 of the grommet 3 to seal the space. Is inserted, there is a problem that the work of penetrating the wire harness W / H is not easy and the workability is impaired. Further, a configuration in which the space S is filled with a sealant has been proposed, but there is a problem that the work of filling the sealant is troublesome. In addition, the grommet is hardly bent by the solid body 6 or the hardened sealant, so that the workability of inserting the grommet into the vehicle body panel is deteriorated. There is also a problem that the cable workability is deteriorated. As described above, when the sound insulation performance is to be improved, the workability is deteriorated, and the compatibility cannot be easily achieved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a grommet capable of improving the sound insulation performance without impairing the flexibility of the grommet and the flexibility of the wire harness and without requiring a large number of labor. It is intended to provide.

[0007]

In order to achieve the above object, according to the present invention, there is provided a fuel cell system comprising: a small-diameter cylindrical reduced-diameter portion; and a conical-tube-shaped enlarged diameter portion extending from one end of the reduced-diameter portion. And a wire harness, in which a group of electric wires is bundled, is passed through an electric wire insertion hole provided along the axis of the reduced diameter portion and the enlarged diameter portion, and a vehicle body locking recess is provided on an outer peripheral portion of the enlarged diameter portion. In the grommet, after projecting radially inward from the inner surface position on the reduced diameter portion side from the position where the vehicle body locking concave portion of the enlarged diameter portion is provided, the reduced diameter portion is inserted along the outer peripheral surface of the wire harness to be inserted. A thin inner peripheral wall portion extending to the distal end opening and further projecting from the distal end opening is integrally formed, and the inner peripheral partition wall portion and the outer peripheral wall constituting the reduced diameter portion and the enlarged diameter portion are formed. Filling the space between the inner part and the inner peripheral partition wall part extended from the tip opening after filling Folded to the outer peripheral wall portion provides a grommet, characterized in that it is fixedly fitted.

As the above liquid, liquid urethane or gel butyl having a large viscosity is preferably used.

The filling of the liquid agent between the outer peripheral wall portion and the inner peripheral partition wall portion may be performed before the wire harness is inserted, or after the wire harness is inserted through the grommet. Is also good. Also, after inserting the wire harness,
When a tape is wound around the outer peripheral surface of the inner peripheral partition wall that is folded back on the outer peripheral wall portion and fixed to the wire harness, the inner peripheral partition wall does not return and liquid leakage does not occur.

With the above construction, a thin-walled reduced-diameter portion forming the outer peripheral wall portion of the grommet, a thinned-diameter enlarged portion on the reduced-diameter portion side from the position where the vehicle body locking concave portion is provided, and a wire harness insertion portion are provided. Is filled with the liquid material, and the inner peripheral partition wall is in close contact with the outer peripheral surface of the wire harness, so that noise from the engine room side and the like and transmission of the incident sound to the room side and the like can be prevented. Can be suppressed. In addition, since the liquid material having viscosity is filled, the grommet does not impair flexibility,
While not reducing the workability of attaching to the body panel, the flexibility of the wire harness inserted through the grommet is not impaired,
Does not lower the workability of wiring the wiring harness.

Further, it is preferable that the outer peripheral surface of the electric wire group of the wire harness penetrated through the electric wire insertion hole is wound with a tape, and the inside thereof is filled with a sealant. (Claim 2) As the sealant, a two-part urethane or the like, which has a lower viscosity than the above liquid agent and easily penetrates into the gaps of the electric wire group, is preferably used.

By filling the inside of the wire harness with the sealant as described above, noise that is likely to enter through the gap between the electric wire groups can be prevented, and the sound insulation performance can be further improved. In addition, the filling of the sealing agent can enhance the waterproof performance.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment. A grommet 10 according to the first embodiment includes a small-diameter cylindrical reduced-diameter portion 11 and a large-diameter portion 12 that expands from one end of the reduced-diameter portion 11 into a conical cylindrical shape. And an inner peripheral partition wall portion 14 protruding from the inner peripheral surface of the outer peripheral wall portion 13 are integrally formed of rubber. A vehicle body engaging recess 15 having a concave cross section is provided in an annular shape on the outer periphery of the enlarged diameter portion 12, the thickness is increased from the vehicle body engaging concave portion 15 toward the front end opening side, and the other enlarged diameter portion 12 and the reduced diameter are provided. The thickness of the portion 11 is thin. A projection 15a is provided on the bottom surface of the vehicle body locking recess 15.
2 and, as shown in FIG.
The protrusion 12a is pressed against the outer peripheral surface of the flange portion 4c bent toward the engine room side X from b.

The inner peripheral partition wall portion 14 has a reduced thickness so that it can be easily bent.
After projecting radially inward from the inner surface position on the
It is folded back to one side and extended so as to protrude from the opening at the end of the reduced diameter portion 11. That is, the inner peripheral partition wall portion 14 includes a radially projecting portion 14a and an axially extending cylindrical portion 14b, and a rib 14c is provided at the tip of the cylindrical portion 14b projecting from the leading end opening of the reduced diameter portion 11.

Before the wire harness W / H in which the outer circumferences of a large number of electric wires w are wound around with the tape T1 as shown in FIG. 2 is inserted into the grommet 10, as shown in FIG. The space defined by the inner peripheral partition wall portion 14 is filled with a liquid material Q having a high viscosity. As the liquid Q, liquid urethane or gel-like butyl is preferably used. After filling the liquid material Q, the distal end of the inner peripheral partition wall portion 14 protruding from the reduced diameter portion 11 is turned outward in the direction indicated by the arrow in FIG. 1 and externally fitted to the outer peripheral wall portion 13 as shown in FIG. It is stuck.

In contrast to the grommet 10, the wire harness W / H is, as shown in FIG.
The wire harness W / H is inserted through the connector 19 attached to the distal end of the wire harness W / H with the reduced diameter portion 11 and the inner peripheral partition wall portion 14 filled with the liquid agent Q expanded. At this time, since the inner peripheral partition wall portion 14 of the grommet 10 is only filled with the liquid agent Q, the inner peripheral partition wall portion 14 has flexibility and elasticity, easily spreads, and works for inserting the wire harness W / H. There is no loss of sex.

After the wire harness W / H is passed through the grommet 10 in the above state, as shown in FIG.
2 is wound from the outer peripheral surface of the reduced diameter portion 11 to the outer surface of the inner peripheral partition wall portion 14 fitted outside, and further to the outer surface of the wire harness W / H, and the wire harness W / H is grommet 10.
And the inner peripheral partition wall portion 14 is kept folded so that liquid leakage does not occur.

When the wire harness W / H to which the grommet 10 is attached is inserted into the through hole 4a of the vehicle body panel 4, the entire enlarged portion 12 of the grommet 10 is once inserted from the engine room side X to the indoor side Y. At this time, it is necessary to bend the enlarged diameter portion 12 so as to have a small diameter. However, this operation can be performed without any problem because the grommet is easily bent. After the enlarged diameter portion 12 is inserted into the room side Y, it is pulled back to the engine room side X, and the vehicle body locking concave portion 15 is locked in the through hole 4b. At that time, the projection 12a is pressed by the flange 4c, and the sealing property is improved.

The grommet 10 attached to the vehicle body panel 4 as described above is provided between the thin-walled reduced-diameter portion 11 and the enlarged-diameter portion 12 and the wire harness W / H even when noise enters from the engine room side X. Is filled with the liquid agent Q via the inner peripheral partition wall portion 14 and the gap is eliminated, so that transmission of noise is suppressed and sound leakage to the indoor side Y is suppressed.

FIG. 4 shows the second embodiment. The difference from the first embodiment is that the wire harness W / H inserted through the grommet 10 is made of two-component urethane or the like from the reduced diameter portion 11 side. A wire harness W filled with a sealing agent 20 having a relatively low viscosity and mainly located inside the reduced diameter portion 11.
/ H is filled with the sealant 20 in the gap between the electric wire groups w.
The grommet 10 itself is the same as in the first embodiment.

As described above, when the gap between the electric wire groups w of the wire harness W / H is also filled with the sealing agent 20, noise entering through the gap between the electric wire groups w can be prevented, and the sound insulation performance can be further improved.

[0022]

As is apparent from the above description, in the grommet according to the present invention, the inner peripheral partition is provided inside the conventional grommet, and the space between the inner peripheral partition and the outer peripheral wall is provided. The grommet is thin and the outer wall is thin, so even if noise is transmitted inside, the transmission of sound is cut off or suppressed, and the noise from the engine room side to the indoor side is filled. Is reduced, and the sound insulation performance can be improved.

Furthermore, since the grommet is filled with the liquid agent, the flexibility of the grommet is not impaired, and neither the workability of inserting the wire harness into the grommet nor the workability of inserting the grommet into the through hole of the vehicle body panel is impaired. It is possible to achieve both sound insulation and workability.

Further, when the wire group of the wire harness inserted into the grommet is filled with a sealant, it is possible to prevent intrusion of noise from a gap between the wire groups and further improve the sound insulation performance.

In particular, in the case of automobiles, it is very important to prevent noise from entering the cabin in order to improve the comfortable performance of the living space in the cabin. In that case, the noise from the engine room side is important. The point is to eliminate or suppress leakage. By using the grommet of the present invention, it is possible to almost completely block low noise and suppress loud noise as well, thereby preventing and suppressing sound leakage into the vehicle interior and improving comfort performance. This has a specific effect that can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a state in which a wire harness is inserted into the grommet of FIG. 1 and locked to a vehicle body.

FIG. 3 is a schematic sectional view showing an operation of inserting a wire harness into the grommet.

FIG. 4 is a cross-sectional view showing a state where a wire harness is inserted through a grommet according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a state where a wire harness is inserted through a conventional grommet.

FIG. 6 is a sectional view showing another conventional grommet.

[Explanation of symbols]

 Reference Signs List 4 vehicle body panel 4b through hole 10 grommet 11 reduced diameter portion 12 enlarged diameter portion 13 outer peripheral wall portion 14 inner peripheral partition wall portion 15 vehicle body locking concave portion 20 sealant Q liquid agent w electric wire W / H wire harness

Claims (2)

(57) [Claims] 1. A small-diameter cylindrical reduced-diameter portion, and a diameter-enlarging portion that expands in a conical cylindrical shape from one end of the reduced-diameter portion, and are provided along the axis of the reduced-diameter portion and the enlarged-diameter portion. In a grommet in which a wire harness in which a group of wires is bundled is passed through a wire insertion hole and a vehicle body locking concave portion is provided on an outer peripheral portion of the enlarged diameter portion, a diameter is reduced from a position where the vehicle body locking concave portion of the enlarged diameter portion is provided. After projecting radially inward from the inner surface position on the part side, extending along the outer peripheral surface of the wire harness to be inserted to the leading end opening of the reduced diameter portion, and further projecting from the leading end opening, the thin inner periphery The partition wall portion is integrally formed, and a space between the inner peripheral partition wall portion and the outer peripheral wall portion constituting the reduced diameter portion and the enlarged diameter portion is filled with a liquid agent, and after filling, extends from the distal end opening. The inner peripheral partition wall portion is folded back to the outer peripheral wall portion and externally fitted and fixed. Met. 2. The grommet according to claim 1, wherein an outer peripheral surface of a group of electric wires of the wire harness penetrated through the electric wire insertion hole is tape-wrapped, and the inside thereof is filled with a sealant.