JPH08242519A - Grommet - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a grommet capable of further improving the sealing function. According to the present invention, a plurality of electric wires 19 are inserted in a close contact state, an electric wire insertion portion 21, a fitting portion 23 that is fitted into a mounting hole 7a of a vehicle body panel 7, and an opening peripheral edge 29 of the mounting hole 7a. .Seal portion 25 that abuts and seals with the panel 7
In the grommet 17 provided with, at least the seal portion 25 is formed of an oil-containing rubber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet for inserting a plurality of electric wires in a mounting state of a vehicle body panel in a sealed state.

[0002]

2. Description of the Related Art FIG. 3 shows a grommet 1 described in Japanese Utility Model Laid-Open No. 64-38720. The grommet 1 includes an electric wire insertion portion 5 into which a plurality of electric wires 3 are inserted, a fitting portion 9 fitted into a mounting hole 7 a of a vehicle body panel 7, and a fitting portion 9 formed in the fitting portion 9. The annular mounting groove 11 is engaged with the opening edge of the mounting hole 7a.

After the annular water swelling material member 13 is fitted in the annular mounting groove 11, the mounting hole 7 of the vehicle body panel 7 is inserted.
The opening edge of a is fitted into the annular mounting groove 11. When the opening edge portion 15 of the mounting hole 7a is fitted into the annular mounting groove 11, as shown in FIG.
As shown in, the water swelling material member 13 is sandwiched between the opening edge portion 15 of the mounting hole 7 a and the inner wall 11 a of the annular mounting groove 11. When water enters between the opening edge portion 15 and the inner wall 11a of the annular mounting groove 11 from this state, the water swelling material member 13 absorbs the water and swells to change into a jelly shape, and the opening edge portion A close contact is made between 15 and the annular mounting groove 11.

According to the grommet 1 using the water swelling material member 13, the water swelling material member 13 absorbs and swells the water invading between the mounting hole 7a and the annular mounting groove 11 to seal the seal. Performance is improved and multiple wires can be attached to the mounting hole 7a.
It can be inserted in a sealed state.

[0005]

However, in the grommet 1 described above, it takes time for the water swelling material member 13 to absorb the invading water and to swell. Therefore, the annular mounting groove 11 and the mounting hole are required before the water swelling material member 13 swells. Water enters through the gap between the opening edge of 7a.

Further, if the water that has entered is swollen and swells to form a jelly, it is easily deformed and its shape is changed by vibration, and the annular mounting groove 11 and the opening edge portion 15 of the mounting hole 7a are changed.
There is a problem in that a gap is created between them and the sealing function deteriorates.

Therefore, an object of the present invention is to provide a grommet capable of further improving the sealing function.

[0008]

In order to achieve the above object, the invention according to claim 1 is an electric wire insertion portion through which a plurality of electric wires are inserted in a close contact state, and a fitting portion which is fitted into a mounting hole of a vehicle body panel. A grommet including a seal portion that closely adheres to and abuts on the opening periphery of the mounting hole to seal between the panel and
It is characterized in that at least the seal portion is made of oil-containing rubber.

The invention according to claim 2 is the invention according to claim 1, characterized in that the seal portion is formed of an annular convex portion that is in close contact with and abuts over the entire circumference of the opening peripheral edge of the mounting hole.

The invention according to claim 3 is the invention according to claim 2, wherein the convex portion comprises an inner projection having an arcuate cross section and an outer projection having a rectangular cross section provided outside the inner projection. Is characterized by.

[0011]

According to the first aspect of the invention, when the seal portion made of oil-containing rubber is brought into close contact with and abuts on the opening peripheral edge of the mounting hole, the oil contained in the seal portion exudes and is attached to the seal portion. It is interposed between the opening peripheral edge of the hole. Therefore, the oil is interposed between the seal portion and the peripheral edge of the opening of the mounting hole to seal the gap between them.

According to the second aspect of the present invention, when the fitting portion is fitted into the mounting hole, the annular convex portion comes into close contact with and abuts over the entire circumference of the opening peripheral edge of the mounting hole, and the annular convex portion and the mounting hole The oil contained between the edge of the opening and the edge of the opening exudes and intervenes between the convex portion and the edge of the opening.

According to the third aspect of the present invention, when the fitting portion is fitted into the mounting hole, the inner projection and the outer projection are brought into close contact with and abut against the peripheral edge of the opening of the mounting hole. When the inner protrusion and the outer protrusion come into close contact with and abut on the opening peripheral edge of the mounting hole, the contained oil exudes, and the oil is present between the opening peripheral edge and the inner protrusion and the outer protrusion.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the grommet according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the inside of the grommet 17, and FIG. 2 is an enlarged sectional view of a portion A in FIG.

As shown in FIG. 1, the grommet 1 of the present embodiment.
Reference numeral 7 is a wire insertion portion 21 through which a plurality of electric wires 19 are inserted in a close contact state, a fitting portion 23 fitted into a mounting hole 7a of the vehicle body panel 7, and an opening peripheral edge 15 of the mounting hole 7a. And a seal portion 25 for sealing the gap with the panel 7.

The electric wire insertion portion 21 is cylindrical and has a plurality of electric wires inserted therein. The outer peripheral portion of the fitting portion 23 formed integrally with the wire insertion portion 21 and having a diameter larger than that of the wire insertion portion 21 is formed of oil-containing rubber (oil-containing silicone rubber, oil-containing NBR, oil-containing CR). Further, a fitting groove 27 is formed on the entire outer circumference of the oil-impregnated rubber. The opening peripheral edge 29 of the mounting hole 7a is fitted in the fitting groove 27. An annular protrusion 31 is formed on one inner wall of the fitting groove 27 so as to come into close contact with and abut on the entire circumference of the opening peripheral edge 29 of the mounting hole 7a. The convex portion 31 is
The inner projections 33 and 35 have an arcuate cross section, and the outer projection 37 has a rectangular cross section and is provided outside the inner projection 35.

When the opening peripheral edge 29 of the mounting hole 7a is fitted in the fitting groove 27, the inner projections 33 and 35 and the outer projection 37 are brought into close contact with and abut one surface of the opening peripheral edge 29. As a result, the inner protrusions 33, 35 and the outer protrusion 37 are bent, and as shown in FIG.
When squeezed out, one side of the panel 7 and the inner protrusions 33, 3
5, intervening between the outer protrusion 37. In this case, the tops 33a, 35a of the inner protrusions 33, 35 that come into contact with the panel 7
The oil components 39 and 41 are always retained on both of the outer protrusions 37a.

According to the present embodiment, by forming the seal portion 25 of the oil-containing rubber, the inner projections 33, 35, the outer projection 37 and the panel 7 can be reliably sealed and the waterproof property can be improved. I can.

According to this embodiment, the inner protrusion 33,
Since the 35 and the outer protrusion 37 are formed in an annular shape, the waterproof property can be further improved.

Further, according to this embodiment, since the outer peripheral portion of the fitting portion 23 is integrally formed of the oil-impregnated rubber, the coefficient of friction between the outer peripheral surface of the grommet and the panel is reduced.
It is possible to improve the assemblability of the grommet 17 to the panel 7.

In this embodiment, the outer peripheral portion of the fitting portion 23 is made of oil-impregnated rubber, but the inner projection 3 of the seal portion 25 is formed.
Even if only 3, 35 and the outer protrusion 37 are made of oil-containing rubber, the waterproofness can be improved.

Further, in the above embodiment, the inner protrusions 33, 3
Although the example in which 5 is provided has been described, only the inner protrusion 33 or the inner protrusion 35 may be provided.

[0023]

As described above, according to the first aspect of the invention, when the seal portion formed of the oil-impregnated rubber is brought into close contact with the opening peripheral edge of the mounting hole, the oil contained in the seal portion is removed. Since it exudes and intervenes between the seal portion and the opening edge of the attachment hole, the seal portion and the opening edge of the attachment hole are sealed, and the waterproof property can be improved.

According to the second aspect of the present invention, when the fitting portion is fitted into the mounting hole, the annular convex portion comes into close contact with and abuts the entire circumference of the opening peripheral edge of the mounting hole, and the annular convex portion and the mounting hole Since the oil contained between the opening and the peripheral edge of the opening exudes and intervenes between the convex portion and the peripheral edge of the opening, the seal portion and the peripheral edge of the opening of the mounting hole are sealed to improve waterproofness. Can be done.

According to the third aspect of the present invention, when the fitting portion is fitted into the mounting hole, the inner protrusion and the outer protrusion are brought into close contact with and abut on the opening peripheral edge of the mounting hole. When the inner and outer protrusions come into close contact with and abut the opening rim of the mounting hole, the oil contained oozes out, and oil is present between the rim of the opening and the inner and outer projections. The gap between the opening and the periphery of the opening is sealed, and the waterproof property can be improved.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of a portion A of FIG.

FIG. 3 is a cross-sectional view showing a grommet using a conventional water-swelling material member.

FIG. 4 is an enlarged sectional view of a part of the conventional grommet shown in FIG.

[Explanation of symbols]

 7 Body Panel 7a Mounting Hole 17 Grommet 19 Electric Wire 21 Wire Insertion Part 23 Fitting Part 25 Sealing Part 29 Opening Edge 31 Convex Part 33, 35 Inner Protrusion 37 Outer Protrusion 39, 41 Oil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Izumi Nomura 252 Kawashimada, Gotemba City, Shizuoka Prefecture Yazaki Parts Co., Ltd.

Claims (3)

[Claims] 1. An electric wire insertion portion through which a plurality of electric wires are inserted in a close contact state, a fitting portion which is fitted into a mounting hole of a vehicle body panel, and a panel which is brought into close contact with and abuts against an opening peripheral edge of the mounting hole. A grommet having a seal portion for sealing, wherein at least the seal portion is formed of an oil-containing rubber. 2. The grommet according to claim 1, wherein the seal portion comprises an annular convex portion that is in close contact with and abuts the entire circumference of the opening peripheral edge of the mounting hole. 3. The grommet according to claim 2, wherein the protrusion comprises an inner protrusion having an arcuate cross section and an outer protrusion having a rectangular cross section provided outside the inner protrusion. .