JP3279098B2 - Grommets for wire harness - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for mounting a wire harness which penetrates a partition plate of an automobile body or the like, to maintain the posture of the wire harness, and to waterproof the penetrating portion. More particularly, the present invention relates to a grommet having a waterproof lip that presses against the periphery of a through hole of a partition plate.

[0002]

2. Description of the Related Art There is a known grommet for a wire harness with a waterproof lip, such as Japanese Utility Model Application Laid-Open No. 2-218217. The grommet is provided in a through-hole portion for holding the wire harness in a waterproof manner and in a through hole in a vehicle body partition plate. An annular waterproof lip provided integrally with the attachment portion is pressed into contact with a peripheral portion of the through hole, and a partition plate through-hole in which a wire harness is provided through the attachment portion. It is designed to waterproof the part.

[0003]

The above-mentioned conventional grommet for a wire harness with a waterproof lip has a tentative waterproofing function, but when high pressure water such as car wash water hits the through hole thereof, the sealing portion is formed by the waterproof lip. There is a problem that water is infiltrated into the room through the air. An object of the present invention is to provide a grommet for a wire harness with a waterproof lip, which solves the above-mentioned disadvantages of the prior art and has excellent sealing performance.

[0004]

A grommet for a wire harness according to the present invention, which solves the above technical problem, has a shape attached to a through hole of a partition plate of a vehicle body or the like, and is pressed against a peripheral edge of the through hole. In a wire harness grommet having a diaphragm attaching portion around which a waterproof lip is provided, the dividing plate attaching portion includes:
Extending from a common fixed end that strikes the base of the diaphragm
Make the interspace a peripheral pocket for receiving the periphery of the through hole
The upper and lower clamping pieces of a pair of upper and lower annular cantilever elastic pieces
And at the bottom of the peripheral pocket,
Notched recesses are formed in the bulging space to reduce the thickness of the fixed end.
Further, two concentric circular waterproof lips are provided in the peripheral pocket on one side of the upper and lower sandwiching pieces, and the concentric circular two waterproof lips are formed in a free state. The height is made higher than the lip height of the small circular waterproof lip, and furthermore, a large circular waterproof lip is formed on the other side of the upper and lower sandwiching pieces by being concentric with the two concentric waterproof lips. Erected and the through hole in the peripheral pocket
When inserting the periphery, either the upper clamping piece or the lower clamping piece
The peripheral pocket is greatly opened by elastically bending
And attach the partition plate attachment part to the through hole.
When the upper clamping piece and the lower part are based on the fixed end
A structure in which the holding pieces are elastically deformed to press and hold the three waterproof lips on the periphery of the through hole. "

[0005]

The wire grommet for a wire harness of the present invention having the above-described structure has two concentric circles on one side having the above-mentioned height requirement and other.
Three waterproof lips on one side are pressed against the periphery of the through hole
Therefore, the posture of the elastic piece that elastically bends the free end portion due to the pressure contact force is slightly raised, and the amount of deflection of the outer waterproof lip having a large diameter becomes larger than the amount of deflection of the inner waterproof lip having a small diameter.
The difference in the amount of flexing absorbs the difference in the lip height, so that the two concentric waterproof lips on one side are pressed against and sealed to the peripheral edge by a substantially uniform pressing force.

Accordingly, the two waterproof lips effectively function as a double seal, and the sealing property of the portion is particularly improved, and even if high pressure water such as car wash water is received, water is discharged from the sealed portion. There is no risk of leaking water.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description will be given based on embodiments. First, with reference to FIG. 1 showing a first embodiment of the present invention, a partition plate for attaching and fixing a wire harness 10 to a through-hole 12 of a partition plate 11 of a vehicle body in an insertion tube portion 2 through which the wire harness 10 is inserted in a waterproof manner. In the grommet 1 for a wire harness in which the attaching portions 3 are continuously provided, a peripheral pocket 4 for receiving the peripheral portion 13 of the through hole 12 is provided around the partition attaching portion 3, and the peripheral pocket 4 is formed of the peripheral portion 1.
3 comprises an upper holding piece 6 and a lower holding piece 7 which are held on both sides of the watertight lip 5. Waterproof lips 5A, 5B and 5C which are pressed against the peripheral portion 13 are inserted into the inside of the peripheral pocket 4. It is bulged annularly toward it.

More specifically, the holding pieces 6 and 7 are attached to the partition plate attaching portion 3.
The connecting portion 14 of the partition plate attaching portion 3 and the insertion tube portion 2 corresponding to the base end of
The common fixed end 9 extends in the outer peripheral direction of the partition plate attaching portion 3
Upper and lower pair, and the middle space
An annular cantilever elastic piece is formed. And pinch
A peripheral pocket 4 which strikes the inside of the common fixed end 9 of the pieces 6 and 7
At the bottom of the cut, cut the fixed end 9 with a thinner
A notch 8 "is provided around the annular cantilever elastic piece.
The elasticity of the pieces 6 and 7 is intentionally improved.

The upper holding piece 6 has a partition plate attaching portion 3
2A concentric circular waterproof lip 5A / 5
B is erected with the tip facing the inside of the peripheral pocket 4, and the lip height of the outer waterproof lip 5 </ b> A having a large diameter is larger than the lip height of the inner waterproof lip 5 </ b> B having a small diameter.
When the upper holding piece 6 is in a free state, the upper holding piece 6 has a shape that becomes higher by a required amount (high difference amount in H in the drawing).

On the other hand, the above-mentioned waterproof lid is attached to the lower holding piece 7.
When a single waterproof lip 5C having a large diameter is formed in a circular shape and is concentric with the rims 5A and 5B, and the peripheral portion 13 is inserted into the peripheral pocket 4, three waterproof lips 5A, 5B and 5C are formed.
Are sandwiched and pressed against both surfaces of the peripheral portion 13 so as to waterproof the through hole 12 portion, and the upper portion of the partition plate attaching portion 3 near the insertion pipe portion 2 which receives high-pressure water such as car wash water has two sections. Are sealed by the waterproof lips 5A and 5B.

The wire harness glow according to the embodiment shown in FIG.
Met 1 is inserted into through hole 12 of diaphragm 11 by the following method.
Be attached. That is, the through hole of the partition plate 11 is formed in the peripheral pocket 4.
When inserting the peripheral part 13 of 12, the upper sandwiching piece 6
Peripheral pocket by elastically bending any one of the holding pieces 7
4 with a large opening at the entrance, followed by a fixed end
Restoration direction of upper sandwiching piece 6 and lower sandwiching piece 7 based on 9
The peripheral edge 13 is elastically flexed by itself.
I fix it. Thus, the upper clamping with the fixed end 9 as the base
The piece 6 and the lower holding piece 7 are elastically bent as shown by the dotted line in the drawing to be waterproof.
Each of the lips 5A, 5B, and 5C is press-fitted to the joint surface of the peripheral portion 13 to make the portion waterproof.

The amount of deflection of the waterproof lips 5A and 5B based on the elastic deflection of the upper holding piece 6 is such that the outer waterproof lip 5A near the free end is more flexible than the inner waterproof lip 5B near the fixed end 9. Since the height difference H is set to an appropriate amount in advance, the height difference H is absorbed by the difference in the amount of flexure, and the two concentric waterproof lips 5A and 5
B uniformly presses against the peripheral portion 13 with substantially the same degree of resilient pressure, exhibits an effective double sealing effect, and can accurately prevent leakage of high-pressure water such as car wash water into the room.

Next, another embodiment of the present invention will be described with reference to FIG. That is, in the embodiment of FIG. 2, the set of two concentric waterproof lips 5A, 5B and 5C, 5D having the same height difference H as that of the embodiment of FIG. Each of the holding pieces 7 is provided. In the embodiment of FIG. 2, the waterproofness of both sides of the peripheral portion 13 is naturally improved.

[0014]

As described above, the grommet for a wire harness according to the present invention has an effect of improving waterproof performance, preventing a trouble of infiltration into a vehicle interior or the like, and improving and stabilizing a grommet function.

[Brief description of the drawings]

1A and 1B show a wire harness grommet according to a first embodiment of the present invention, wherein FIG. 1A is a front sectional view, FIG. 1B is an enlarged front view of a main part, and FIG. Figure

FIG. 2 is an enlarged front view of a main part of a wire harness grommet according to another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 grommet for wire harness 2 insertion tube portion 3 partition plate attaching portion 4 peripheral pocket 5A, 5B, 5C, 5D waterproof lip 6 upper retaining piece 7 lower retaining piece 8 notch recess 9 fixed end 10 wire harness 11 partition plate 12 Through-hole 13 Peripheral part 14 Connecting part

Claims (1)

(57) [Claims] 1. A grommet for a wire harness having a shape to be attached to a through hole of a partition plate of a vehicle body or the like, and having a partition plate attachment portion provided with a waterproof lip provided in pressure contact with a peripheral edge of the through hole. The partition plate attachment portion is shared with the base of the partition plate attachment portion.
Extending from the fixed end of the through hole to receive the intermediate space at the periphery of the through hole.
A pair of upper and lower annular cantilevers in the peripheral pocket for receiving
It consists of an upper clamping piece and a lower clamping piece of the beam elastic piece, and
An inflated shape at the bottom of the peripheral pocket to reduce the thickness of the fixed end
A notch recess is formed in the space, and two concentric circular waterproof lips are erected in the peripheral pocket on either one of the upper and lower sandwiching pieces, and the concentric circular two ridges are free. The lip height of the large-diameter waterproof lip is required to be higher than the lip height of the small-diameter waterproof lip, and further, the other side of the upper and lower sandwiching pieces is concentric with the two concentric waterproof lips. and Takashi設waterproof lip of great circle diameter in the said peripheral edge
When inserting the periphery of the through hole into the pocket,
Either one of the piece and the lower holding piece
The edge pocket is opened widely, and the partition plate attaching portion
When attaching to the through hole, the fixed end is used as a base.
A grommet for a wire harness, wherein the upper holding piece and the lower holding piece are elastically bent to press and hold the three waterproof lips on the periphery of the through hole.