JPH08168143A - Grommet - Google Patents

Abstract

PURPOSE: To enhance the durability by providing a filler containing part, having an opening larger than a wire inserting part, at the end part of a grommet body on the outer space side thereof and filling the containing part with a curing liquid filler thereby blocking intrusion of water into a grommet. CONSTITUTION: A hollow part 33 to be filled with a curing liquid tiller R is provided at the end part 9a of an outer space S0 of a grommet body 9. A grommet 31 held on the outer circumference of a wire harness W is erected such that the opening 35 at the filler containing part 33 is located above and then a curing liquid filler R is injected through the opening 35 into the filler containing part 33. Under a state where the grommet 31 is fitted in a hole part 5 of a panel 3, the gap between a cured filler R and a tape T wound around the wire harness W is blocked perfectly on the opening side of the filler containing part 33. This structure blocks intrusion of water into the grommet 31 perfectly thus enhancing the durability of the grommet 31 and the tape T.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof grommet which is fitted in a panel of a vehicle or the like and has an electric wire inserted therethrough.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional grommet 1 of this type (see Japanese Utility Model Laid-Open No. 24-42525).

As shown in FIG. 1, when the wire harness W is inserted into the panel 3 which defines the internal space Si and the external space So, the grommet 1 is fitted into the hole 5 formed in the panel 3 to form the wire harness. W is inserted into the grommet 1 and pulled out from the internal space Si to the external space So. The internal space Si is a space that requires waterproofing, such as the interior of an automobile, and the external space So is a space that does not require waterproofing, such as the engine room. In this case, the panel 3 corresponds to a dash panel.

The grommet 1 includes a cylindrical grommet body 9 having an electric wire insertion portion 7 on the inner side, and an elastic bulge portion 11 bulged on the outer periphery of the grommet body. A groove portion 13 to be fitted into the hole portion 5 of the panel 3 is formed at the tip. According to this grommet 1,
It is possible to prevent water and the like from entering the inner space Si from the outer space So through the hole 5.

Further, the wire harness W is composed of a plurality of electric wires Wa.
Are bundled by the tape T, and water and oil may leak from the gaps between the electric wires Wa. Therefore, in this conventional example, the grommet body 9 is provided with the pipe portion 15 communicating with the electric wire insertion portion 7. The protruding portion is provided, and the liquid curable filler R is injected and filled from the pipe portion 15 into the electric wire insertion portion 7. As a result, the gap between the electric wires Wa inserted in the electric wire insertion portion 7 is filled with the filler R, and the water blocking effect can be obtained in the electric wire insertion portion 7.

FIG. 7 shows another conventional grommet 21 (see Japanese Utility Model Laid-Open No. 1-66713).

This grommet 21, like the grommet 1 of FIG. 6, has a cylindrical grommet main body 9 having an electric wire insertion portion 7 on the inner side, and a groove 13 formed at the tip of the grommet main body 9 so as to bulge out. And an elastic swelling portion 11 having
The wire harness W has the elastic swelled portion 11 extending from the wire insertion portion 7.
Is inserted through the inside 11a. Inside of elastic bulge 11 1
A liquid curable filler R is filled in 1a and the gaps between the electric wires Wa are filled, and the same waterproofness as that of the grommet 1 in FIG. 6 can be obtained.

[0008]

However, in such a conventional grommet 1 or 21, the grommet body 9 and the wire harness W are completely closed at the end 9a of the grommet body 9 on the external space So side. Since water does not enter through the gap 15 between them, the end portion 9 of the grommet body 9
There is a possibility that water will remain in the wire insertion portion 7 between the a and the filler R. In particular, water that has entered the gaps between the electric wires Wa is difficult to escape, and due to such a pool of water, the tape T wound around the electric wires Wa and the external space So of the grommet body 9
However, the durability of the end portion 9a on the side may be reduced, which may be a concern.

Further, in the grommet 21 of FIG. 7, since the inside of the elastic bulging portion 11a is filled with the filler R,
When the elastic bulging portion 11 is formed large, a large amount of filler R
There was an inconvenience that it became necessary.

In view of the above circumstances, the present invention aims to provide a grommet capable of improving the durability by suppressing the amount of the filler to a small amount.

[0011]

According to a first aspect of the present invention, there is provided a grommet body having an electric wire insertion portion, and a hole of a panel which is formed by bulging on an outer periphery of the grommet body to divide an internal space and an external space. A grommet having an elastic swelling portion fitted to the portion, the filling having an opening at the end of the grommet body on the external space side, the opening having a diameter larger than that of the wire insertion portion and communicating with the wire insertion portion. It is characterized in that a drug container is provided.

The invention according to claim 2 is the grommet according to claim 1, wherein at least a part of the opening side of the filler accommodating portion is a cutout portion defined by a thin easily breakable portion. It is characterized by being.

[0013]

According to the first aspect of the present invention, the grommet main body is provided with a filler accommodating portion having an opening whose diameter is larger than that of the wire insertion portion at the end of the grommet main body on the side of the outer space, and the liquid accommodating portion is liquid curable. Since the filler is filled in, the gap between the cured filler and the electric wire is completely closed on the opening side of the filler containing portion. As a result, it is possible to completely prevent water from entering the inside of the grommet and prevent the occurrence of water pools.

If the filler is also filled between the electric wires in the filler accommodating portion, the gap between the electric wires is filled with the filler, so that the water blocking effect can be obtained.

Further, since the filler accommodating portion is provided separately from the elastic swelling portion, the dimension and shape of the filler accommodating portion can be set to the minimum regardless of the dimension and shape of the elastic swelling portion. The amount can be kept small.

According to the second aspect of the invention, in addition to the function of the first aspect of the invention, at least a part of the opening side of the filler accommodating portion is a cutout portion, and the filler is injected and cured. Later, the excision is cut off. At this time, since the cutout portion is partitioned by the thin easily breakable portion, the operator can easily separate the cutout portion from the filler accommodating portion along the easy breakable portion. Then, after the filler is injected and cured, the excision part is cut off, so even if the filler injection amount increases a little, it is possible to prevent the filler from overflowing the opening, and when using the excision part. Since water flows down from the part where the parts are separated, it is possible to prevent water from being accumulated between the opening and the filler.

[0017]

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

FIG. 1 is a sectional view showing a use state of a grommet according to an embodiment of the present invention. FIG. 2 is a view showing a state before using the grommet of FIG. 1, (a) is a plan view,
(B) is a side sectional view. FIG. 3 is an enlarged view of part A of FIG. The same parts as those of the related art are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, the grommet 31 of this embodiment has an end portion 9a of the grommet body 9 on the external space So side.
In addition, a filler containing portion 33, which is hollow and filled with a liquid curable filler R, is provided inside. Filler container 3
3 is bulged from the end 9a of the grommet body 9 toward the inner side of the external space So, and an opening 35 is provided at the tip thereof. The opening 35 communicates with the wire insertion portion 7, and the outer diameter of the opening 35 is larger than the outer diameter of the wire insertion portion 7. Further, the inside 33 a of the filler accommodating portion 33 has a smaller diameter than the inside 11 a of the elastic bulging portion 11.

As shown in FIG. 2 (b), the filler accommodating portion 3
On the inner peripheral wall of 3, protrusions 37 for preventing peeling of the hardened filler R (see FIG. 1) are provided in upper and lower two stages (37a, 37a,
37b). As shown in FIGS. 2A and 2B, two cutout portions 39 facing each other are provided on the opening 35 side of the filler containing portion 33. The excision part 39 is
It is divided into the thin easily breakable portions 41 and is integrally formed with the filler accommodating portion 33. The lower side of the easily breakable portion 41 has an opening 35.
It almost coincides with the upper end of the upper protrusion 37a located on the side.

As shown in FIG. 3, the thickness d of the easily breakable portion 41.
Is formed by the cutout groove 43.
The thickness is about 1/3 of the wall thickness D of 9. Thereby, the worker can easily cut the easily breakable portion 41 from the filler accommodating portion 33 along the easy breakable portion 41 by the force of the fingertip.

Further, on the inner peripheral wall of the grommet body 9 on the side of the end 9a, there is provided a protrusion 17 that is pressed against the outer periphery of the wire harness W (see FIG. 1) inserted into the wire insertion portion 7.

When the grommet 31 is used, first, the wire harness W is inserted from the opening 35 of the filler accommodating portion 33 into the wire insertion portion 7 of the grommet main body 9 and held at a predetermined position of the wire harness W. At this time, when the wire harness W is not sufficiently pressed by the protrusion 37, in order to reliably prevent the filler R from flowing into the wire insertion portion 7 side, as shown in FIG. A tape Ta is wound around the outer periphery of the end portion 9a side, and the wire harness W is fastened from the outside of the grommet body 9 with the tape Ta.

Next, as shown in FIG. 5, the grommet 31 held on the outer periphery of the wire harness W is erected so that the opening 35 of the filler accommodating portion 33 is located above, and the opening 3 is opened.
The liquid curable filler R is injected into the filler storage portion 33 from 5. When the filler R is injected, the top surface of the filler R is projected by the ridge 37a.
When the upper end of the breakable portion 41 is reached, that is, when the lower edge of the easily breakable portion 41 is reached. At this time, even if the injection amount of the filler R is slightly increased, the filler R is opened by the cutting portion 39.
5 can be prevented from overflowing.

After the injected filler R has hardened, the cutout 39 is separated from the filler accommodating portion 33, and the elastic swelling portion 1 is cut off.
The groove 13 of No. 1 is fitted into the hole 5 of the panel 3.

At this time, since the cut portion 39 is divided into the thin easily breakable portions 41, the operator easily grips both sides of the easily breakable portion 41 with his fingertips and tears with the force of the fingertips. The cutout portion 39 can be easily separated along the fractured portion 41.

As shown in FIG. 1, in the use state in which the grommet 31 is fitted in the hole 5 of the panel 3, the filler accommodating portion 3 is used.
On the side of the opening 35 of 3, the cured filler R and the tape T wound around the outer periphery of the wire harness W are completely closed. As a result, the entry of water into the grommet 31 can be completely prevented, and the water pool inside the grommet 31 can be prevented from occurring.
Also, the durability of the tape T can be improved.

When used, the cutting portion 39 (see FIG. 2B)
Since water flows down from the part where the filler R is separated, it is possible to prevent water from accumulating between the opening 35 and the upper surface of the filler R, and a cutout portion 39 is provided to easily separate the filler R from the hardened portion. With such a structure and work, the durability of the grommet 31 and the tape T can be further improved.

Further, since the filler containing portion 33 is provided separately from the elastic bulging portion 11 and the inside 33a of the filler containing portion 33 has a smaller diameter than the inside 11a of the elastic bulging portion 11, the elastic bulging portion 11 is formed. The size and shape of the filler accommodating portion 33 can be set to a minimum regardless of the size and shape, and the required amount of the filler R can be suppressed to a small amount.

Further, since the cutout portions 39 are provided at the two opposite positions of the filler accommodating portion 33, the two tongue pieces 45 opposite to each other remain after the cutout portion 39 is cut off. By winding a tape (not shown) from the outside of 45, the grommet 31 and the wire harness W can be reliably fixed.

Further, if the tape T is not wound around the wire harness W in the filler accommodating portion 33, the filler R can be filled between the electric wires Wa, and the electric wires Wa can be filled with each other. Since the gap between them is filled with the filler R, it is possible to obtain a water blocking effect between the electric wires Wa.

In this embodiment, since the cutout portions 39 are provided at two opposite positions of the filler containing portion 33, the cutout portion 39 is provided.
After the separation, the two tongue pieces facing each other remain, and by winding the tape (not shown) from the outside of the tongue pieces, the grommet and the wire harness can be securely fixed.

However, the present invention is not limited to this, and for example, the filler accommodating portion 33 may be provided so that the entire circumference of the end portion on the opening 35 side is cut off.

[0034]

As described above, according to the first aspect of the present invention, between the cured filler and the electric wire is completely closed on the opening side of the filler containing portion. Therefore, it is possible to completely prevent the entry of water into the inside of the grommet and prevent the occurrence of water pool, and it is possible to improve the durability of the grommet and the tape.

Furthermore, since the filler accommodating portion is provided separately from the elastic bulging portion, the amount of the filler can be suppressed to a small amount regardless of the size and shape of the elastic bulging portion.

According to the invention of claim 2, claim 1
In addition to the curing of the invention described in (1), at least a part of the opening side of the filler accommodating portion is a cutout portion, so that when the filler is injected, the filler may overflow from the opening even if the injection amount is slightly increased. After curing, the cutout part can be easily separated from the filler storage part by the easily breakable part, and when the cutout part is cut off, water flows down from the part where the cutout part was cut off during use. It is possible to prevent the accumulation of water during. Therefore, the durability of the grommet and the tape can be further improved with a simple structure and work.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of a grommet according to an embodiment of the present invention.

2A and 2B are diagrams showing a state before use of the grommet of FIG. 1, in which FIG. 2A is a plan view and FIG. 2B is a side sectional view.

FIG. 3 is an enlarged view of part A of FIG.

FIG. 4 is a perspective view showing a state in which a wire harness is inserted into the grommet of FIG.

5 is a side sectional view showing a state where a filler is being injected into the grommet of FIG.

FIG. 6 is a sectional view showing a conventional example.

FIG. 7 is a sectional view of an essential part showing another conventional example.

[Explanation of symbols]

 3 Panel 5 Hole 7 Wire Insertion Section 9 Grommet Main Body 9a End on External Space Side 11 Elastic Swelling Section 31 Grommet 33 Filler Storage Section 35 Opening 39 Cutout Section 41 Easy Breaking Section Si Internal Space So External Space T Tape W Wire Harness Wa electric wire

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Mamoru Ono 2464-48 Washizu, Kosai City, Shizuoka Prefecture Yazaki Parts Co., Ltd.

Claims (2)

[Claims] 1. A grommet body having an electric wire insertion portion,
In a grommet provided with an elastic swelling portion formed to swell on the outer periphery of the grommet body and fitted into a hole of a panel for partitioning an inner space and an outer space, an end portion of the grommet body on the outer space side. The grommet is characterized in that a filler accommodating portion having an opening larger in diameter than the electric wire insertion portion and communicating with the electric wire insertion portion is provided. 2. The grommet according to claim 1, wherein at least a part of an opening side of the filler containing section is a cutout section partitioned by a thin easily breakable section. .