JP2003032858A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet capable of improving waterproofing. SOLUTION: This grommet 10 includes a thick-walled inclined part 13 for guiding a panel between a small-diameter electric wire holding cylinder 11 and a large-diametric panel fitting part 15 into which a wire harness 7 is inserted, and is provided with an annular recessed fitting groove 15d fitted into an edge part 9b of a through-hole 9a of a panel 9 on an outer wall surface 15a of the panel fitting part 15. In the grommet 10, a bellows connecting part 12 is provided between the electric wire holding cylinder 11 and the inclined part 13 to connect the electric wire holding cylinder 11 with the inclined part 13 via the bellows connecting part 12. Thus, even if the wire harness 7 is pressed against the panel 9, the bellows connecting part 12 causes the inclined part 13 to move in such a direction as to press the fitting groove 15d of the panel fitting part 15 against the edge part 9c of the through-hole 9b of the panel 9, and prevents generation of a clearance between the fitting groove 15d of the panel fitting part 15 and the edge part 9b of the through-hole 9a of the panel 9, thereby completely preventing generation of water invasion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet which is fitted in a through hole of a panel of a vehicle or the like and allows a wire harness (electric wire bundle) to be inserted therethrough, which is excellent in waterproofness.

[0002]

2. Description of the Related Art A grommet of this type is shown in FIG. This grommet 1 is a thick-walled panel guide for connecting a small-diameter electric wire holding tubular portion 2 into which a wire harness 7 is inserted and a large-diameter panel fitting portion 6 via respective connecting portions 3 and 5. The inclined portion 4 is provided, and the whole is integrally formed of an elastic material such as rubber.

The base end of the small-diameter wire-holding tubular portion 2 and the inner peripheral edge of the inner wall of the thick-walled inclined portion 4 are integrally connected by a ring-shaped plate-like connecting portion 3. Further, the outer wall surface 6a of the panel fitting portion 6 is formed with an annular concave fitting groove 6b which is fitted to the edge portion 9b of the through hole 9a of the panel 9.

[0004]

However, in the above-mentioned conventional grommet 1, the wire harness 7 is pressed against the panel 9 side as shown by the chain double-dashed line in FIG. 4 due to the relationship of the vehicle space on the engine room side and the like. When the wire harness 7 is inserted through the wire holding tubular portion 2, the thick inclined portion 4 is pulled in the direction of arrow A in FIG. 5 and the connecting portion 5 extends. There is a possibility that a gap t is generated between the fitting groove 6b of No. 6 and the edge portion 9b of the through hole 9a of the panel 9, and water may enter from the gap t.

Therefore, the present invention has been made to solve the above-mentioned problems, and a grommet capable of improving the waterproof property between the fitting groove of the panel fitting portion and the edge of the through hole of the panel. The purpose is to provide.

[0006]

According to a first aspect of the present invention, a thick wall inclination for guiding a panel is provided between a small-diameter wire holding tubular portion into which a wire harness is inserted and a large-diameter panel fitting portion. A grommet having a ring-shaped recessed groove that is fitted to the edge of the through hole of the panel on the outer wall surface of the panel fitting portion, and between the wire holding tubular portion and the inclined portion. Is provided with a bending corresponding portion, and the electric wire holding tubular portion and the inclined portion are connected via the bending corresponding portion.

In this grommet, even if the wire harness is regulated so as to be pressed against the panel side due to the vehicle space or the like, the inclined portion is separated from the panel by the bending corresponding portion connecting the electric wire holding tubular portion and the inclined portion. It does not move in the direction. Accordingly, no gap is generated between the fitting groove of the panel fitting portion and the edge of the through hole of the panel, and the waterproofness of the grommet is improved.

A second aspect of the present invention is the grommet according to the first aspect, characterized in that the bending corresponding portion is formed in a bellows shape that is folded back and extends in a V shape inside.

With this grommet, even if the wire harness is regulated so as to be pressed against the panel side, the V
The bellows-shaped bend corresponding portion that is folded back and extends in a letter shape surely prevents the inclined portion from moving in a direction in which the inclined portion is separated from the panel side. As a result, the adhesion between the fitting groove of the panel fitting portion and the edge of the through hole of the panel is constantly enhanced, and the waterproofness of the grommet is further improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a grommet according to an embodiment of the present invention, FIG. 2 is a sectional perspective view of the grommet, and FIG. 3 is an enlarged sectional view of a main part of the grommet.

As shown in FIGS. 1 and 2, the grommet 10
Is a thin-walled, cylindrical wire-holding tubular portion 11 into which the wire harness 7 is inserted, and a panel guide thickness integrally formed on the wire-holding tubular portion 11 via a connecting portion (bending corresponding portion) 12. The slanted portion 13 having a substantially conical tubular shape with meat and the slanted portion 13
A thick and substantially cylindrical panel fitting portion 15 integrally formed with the connecting portion 14 and an inclined portion 13 between the wire holding tubular portion 11 and the panel fitting portion 15 are integrally formed to project. A soundproof film that extends from the inner tip of the optional pre-penetrating tubular portion 16 and the lightening portion 15c on the back surface of the panel fitting portion 15 to a position in close contact with the wire harness 7 and forms an air layer Y for soundproofing inside. 18 and a lip portion 19 having a substantially V-shaped cross section, which is integrally formed so as to project outward from the outer peripheral surface (outer wall surface) 15a of the panel fitting portion 15 and is in close contact with a vehicle panel 9 described later.
The electric wire holding cylinder portion 11, the inclined portion 13, the panel fitting portion 15 and the like are integrally formed of an elastic material such as rubber.

As shown in FIGS. 1 and 2, the wire holding tubular portion 1
1, the center is inclined and the diameter of the tip opening 11a side is smaller than that of the base end side, and a plurality of bulging portions 11c having different inner diameters are integrally and integrally formed in an inner wall 11b. And
The wire harness 7 penetrating into the electric wire holding tubular portion 11 is tightened by the respective bulging portions 11c, and is held by the electric wire holding tubular portion 11 with no gap by the adhesive tape T wrapped around the outer circumference of the electric wire holding tubular portion 11. Has become.
An annular tape stop portion 11d is integrally formed on the outer wall of the wire holding cylinder portion 11 so as to project therefrom.

As shown in FIGS. 1 to 3, a connecting portion 12 serving as a bending-corresponding portion is formed in a bellows shape that is folded back to have a V-shaped cross section and extends inward to integrally form the wire holding cylinder portion 11 and the inclined portion 13. Are linked together. That is, this bellows-shaped connecting portion 1
The distal end of 2 is integrally formed with the base end of the electric wire holding tubular portion 11, and the base end of the bellows-shaped connecting portion 12 is integrally formed inside the inner wall 13 a of the inclined portion 13.

On the outer peripheral surface 15a of the panel fitting portion 15, there is formed an annular concave fitting groove 15d which is fitted to the edge portion 9b of the through hole 9a of the vehicle panel 9. Further, the panel fitting portion 15 has a thinned portion 15c formed on the back surface thereof to have a predetermined thickness, and the lip portion 19 having a large amount of undercut when the mold for molding (not shown) is released (mold open). By elastically deforming to the side of the lightening portion 15c, the mold of the molding die can be easily opened.

As shown in FIG. 2, the optional pre-penetrating cylinder portion 16 is formed in a cylindrical shape, and is disposed inside the panel fitting portion 15 and the soundproof film 18. A hood lock cable (not shown) is penetrated and held in the preliminary penetrating cylinder portion 16. Further, the front end side of the preliminary penetrating cylinder portion 16 is closed by a lid portion 16a, which is used after the lid portion 16a is cut and a hole is opened when an option is attached.

As shown in FIGS. 1 and 2, the soundproof film 18 is
A curved portion 18a that extends toward the wire harness 7 side from the inner tip of the lightening portion 15c on the back surface of the panel fitting portion 15, a bent portion 18b that is folded back inward from the curved portion 18a in a V-shaped cross section, and this bent portion The wire holding cylinder portion 18c has a substantially cylindrical shape and extends from the portion 18b to a position in close contact with the wire harness 7. A plurality of reduced diameter portions 18d are integrally formed in the longitudinal direction of the electric wire holding tubular portion 18c so as to project outward in a U-shaped cross section.
The wire harness 7 penetrating inside is reduced in diameter by the adhesive tape T wrapped around the outer circumference of the electric wire holding tubular portion 18c.
d is pressed without a gap and held in the electric wire holding tubular portion 18c without a gap. As a result, the space formed between the wire holding tubular portion 11, the inclined portion 13, the panel fitting portion 15, and the soundproof film 18 serves as a soundproof air layer Y. It should be noted that the tape stopper 1 is provided on the outer wall of the wire holding tubular portion 18c.
8e is integrally formed.

According to the grommet 10 of the above embodiment,
As shown in FIG. 1, the wire harness 7 is provided in the cylindrical electric wire holding tubular portion 11 and the cylindrical electric wire holding tubular portion 18 of the soundproof film 18.
After being penetrated into the electric wire holding tubular portion 11, the adhesive tape T is wrapped around the outer circumference of the electric wire holding tubular portion 11 to hold the wire harness 7 in the electric wire holding tubular portion 11 without a gap, and the electric wire holding tubular portion 18c.
Wrap the adhesive tape T around the outer circumference of the wire holding tubular portion 18c
By holding the wire harness 7 without any gap inside,
A soundproof air layer Y is formed between the wire holding tubular portion 11, the inclined portion 13, the panel fitting portion 15, and the soundproof film 18. This air layer Y can reliably prevent noise from being transmitted from the engine room side to the vehicle interior through the grommet 10.

Further, the wire harness 7 may be restricted so as to be pressed against the panel 9 side shown in the direction of arrow B in FIG. 1 depending on the vehicle space on the engine room side. In this case, the wire holding tubular portion 11 through which the wire harness 7 is inserted bends in the direction of arrow B. Due to the bending of the electric wire holding tubular portion 11, the lower portion of the bellows-like connecting portion 12 in FIG. 1 is elastically deformed so as to be crushed, and the upper portion of the bellows-like connecting portion 12 in FIG. Elastically deforms to extend to. Due to the elastic deformation of the upper portion of the bellows-shaped connecting portion 12 extending upward, the inclined portion 13 moves so as to be lifted in the direction indicated by the arrow C in FIGS. By the movement of the inclined portion 13, the side wall portion of the fitting groove 15d of the panel fitting portion 15 is pressed in the direction of arrow D in FIG. 3 via the connecting portion 14. As a result, the side wall portion of the fitting groove 15d of the panel fitting portion 15 is always pressed against the edge portion 9b of the through hole 9a of the panel 9, so that the fitting groove 15d of the panel fitting portion 15 and the panel 9 penetrate. The adhesiveness between the hole 9a and the edge portion 9b is constantly enhanced, and the waterproof property of the grommet 10 can be improved. Therefore, no gap is generated between the fitting groove 15d of the panel fitting portion 15 and the edge portion 9c of the through hole 9b of the panel 9, and the intrusion of water can be reliably prevented.

According to the above-mentioned embodiment, the example of the grommet attached to the vehicle panel is shown, but the object to which the grommet is attached is not limited to the vehicle.

[0021]

As described above, according to the first aspect of the present invention, since the wire holding cylinder portion and the inclined portion are connected through the bending corresponding portion, the wire harness is installed on the panel side due to the vehicle space and the like. Even if it is regulated to be pressed against
The bending corresponding portion connecting the electric wire holding tubular portion and the inclined portion prevents the inclined portion from moving in a direction away from the panel.
As a result, no gap is generated between the fitting groove of the panel fitting portion and the edge of the through hole of the panel, and the waterproofness of the grommet can be improved.

According to the invention of claim 2, since the bending corresponding portion is formed in a bellows shape which is folded back in a V shape and extends inward, the bellows shape is formed even if the wire harness is regulated so as to be pressed against the panel side. The bending-corresponding portion can reliably prevent the inclined portion from moving in a direction in which the inclined portion tends to separate from the panel. Thereby, the adhesion between the fitting groove of the panel fitting portion and the edge of the through hole of the panel can be constantly enhanced, and the waterproofness of the grommet can be further improved.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional perspective view of the grommet.

FIG. 3 is an enlarged sectional view of a main part of the grommet.

FIG. 4 is a cross-sectional view of a conventional grommet.

FIG. 5 is an enlarged sectional view of a main part of the grommet of the conventional example.

[Explanation of symbols]

7 wire harness 9 panels 9a through hole 9b edge 10 Grommet 11 Electric wire holding cylinder 12 Bellows-shaped connecting part (flexing part) 13 Inclined part 15 Panel fitting part 15a Outer peripheral surface (outer wall surface) 15d Fitting groove

Claims (2)

[Claims] 1. A thick-walled inclined portion for guiding a panel is provided between a small-diameter wire holding tubular portion through which a wire harness is inserted and a large-diameter panel fitting portion, and the panel fitting portion A grommet having an annular concave fitting groove that is fitted to an edge of a through hole of a panel on an outer wall surface, wherein a bending corresponding portion is provided between the wire holding tubular portion and the inclined portion, and the bending corresponding portion is provided. A grommet characterized in that the electric wire holding tubular portion and the inclined portion are connected to each other via. 2. The grommet according to claim 1, wherein the bending corresponding portion is formed into a bellows shape that is folded back in a V shape and extends inside.