JP2002058144A - Still water grommet - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a waterproof grommet capable of improving soundproofing. SOLUTION: A small-diameter cylindrical portion 11 and a large-diameter cylindrical portion 13 into which a wire harness 18 is inserted are provided, and a cable penetrating cylindrical portion 1 is provided between the small-diameter cylindrical portion 11 and the large-diameter cylindrical portion 13.
4, a fitting portion 13b fitted to the through hole 21 of the panel 20 is provided on the outer peripheral surface 13a of the large-diameter cylindrical portion 13, and
On the inner side of the large-diameter tube portion 13, a water-stop cylinder portion 12 communicating with the small-diameter tube portion 11 is provided, while an end portion 12d of the water-stop cylinder portion 12 is provided.
A water-proof grommet 10 in which a soundproof film 16 that is folded outward to form an air layer Y is provided, and a space X defined by a water-stop cylinder portion 12 and a wire harness 18 is filled with a liquid curable sealing agent 17, The cable penetrating tube portion 14 is provided inside the water blocking tube portion 12, and the tip side of the inversion portion 16 c of the soundproof film 16 is allowed to come into close contact with the inner peripheral surface 13 c of the large-diameter tube portion 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof / soundproof waterproof grommet which is fitted in a through hole of a panel of a vehicle or the like and through which a wire harness (wire bundle) is inserted.

[0002]

2. Description of the Related Art FIG. 5 shows a water stop grommet of this type. In the water stopping grommet 1, the small-diameter cylindrical portion 2 and the large-diameter cylindrical portion 3 into which the wire harness 8 is inserted are integrally formed of an elastic material such as rubber, and the small-diameter cylindrical portion 2 and the large-diameter cylindrical portion 3 are connected to each other. Hood lock cable 8 'between
Are integrally formed with a plurality of cable penetration tubular portions 4 through which
A fitting groove 3a to be fitted into a through hole 9a of a body panel 9 of a vehicle is formed on an outer wall surface of the large-diameter cylindrical portion 3.

[0003] Further, inside the large-diameter tube portion 3, a water-stop cylinder portion 5 communicating with the small-diameter tube portion 2 is integrally formed to protrude. A soundproof film 6 that is folded outward to form an air layer Y is integrally formed on an end 5a of the water-stop cylinder 5 so as to protrude. The space X formed by the water-stop cylinder 5 and the wire harness 8 is filled with a liquid curable sealant 7.

[0004] A similar technique relating to the waterproof grommet 1 is disclosed in Japanese Utility Model Laid-Open No. 6-41324 and Japanese Patent Laid-Open No. 2000-1.
No. 04865 and the like.

[0005]

However, in the conventional waterproof grommet 1 described above, since the cable penetrating tubular portion 4 is outside the soundproofing film 6, when the inverted portion 6a of the soundproofing film 6 is turned outward, the cable penetrating portion 4a is turned off. A portion of the inverted portion 6a of the soundproof film 6 which faces the cable penetrating tube portion 4 is an inner wall surface 3b of the large-diameter tube portion 3.
Could not be closely contacted without any gap, which had an adverse effect on its soundproofing performance.

Further, since there is no difference in height between the cable penetrating cylinder part 4 and the water stopping cylinder part 5, water transmitted from the body panel 9 may enter the cable penetrating cylinder part 4.

Accordingly, the present invention has been made in order to solve the above-mentioned problems, and has as its object to provide a waterproof grommet that can improve soundproofing and waterproofness.

[0008]

According to a first aspect of the present invention, there is provided a small-diameter cylindrical portion and a large-diameter cylindrical portion into which a wire harness is inserted, and a cable between the small-diameter cylindrical portion and the large-diameter cylindrical portion. A water-stop cylinder having a through-cylinder portion, an outer peripheral surface of the large-diameter tube portion provided with a fitting portion to be fitted into a through-hole of the panel, and an inner side of the large-diameter tube portion communicating with the small-diameter tube portion; On the other hand, a soundproof film that is folded outward to form an air layer is provided at an end of the water-stop cylinder portion, and a liquid curable sealant is applied to a space formed by the water-stop cylinder portion and the wire harness. In the filled water-stop grommet, the cable penetrating tube portion is provided inside the water-stop tube portion, and a tip side of a reversal portion of the soundproof film is made to be able to come into close contact with an inner peripheral surface of the large-diameter tube portion. I do.

In this water stopping grommet, the tip side of the inverted portion of the soundproof film is securely brought into close contact with the entire periphery of the inner peripheral surface of the large-diameter cylindrical portion.
An air layer is secured inside the large-diameter cylindrical portion. This further improves the soundproofing of the waterproof grommet.

According to a second aspect of the present invention, there is provided the waterproof grommet according to the first aspect, wherein the cable penetrating tubular portion is provided inside the inverted portion of the soundproof film, and the inverted portion of the large-diameter tubular portion is provided at the inverted portion. A plurality of locking portions that are locked to the plurality of locking portions on the peripheral surface are provided.

In this water stopping grommet, the cable penetrating cylindrical portion does not hinder the bending of the inverted portion of the soundproof film, and any one of the bent inverted portions is connected to the inside of the large-diameter cylindrical portion. The reversing portion of the soundproofing film can be easily attached to the inner peripheral surface side of the large-diameter cylindrical portion by a simple work of locking only one of the locking portions on the peripheral surface, and the reversing portion of the soundproofing film comes out. Is reliably prevented.

According to a third aspect of the present invention, there is provided the waterproof grommet according to the first aspect, wherein the waterproof grommet is provided between the cable penetrating tubular portion and a wall formed at a boundary between the small-diameter tubular portion of the water stopping tubular portion. It is characterized by having a concave portion for use.

In this waterproof grommet, a waterproof recess is provided between the cable penetrating tubular portion and the wall of the waterproof tubular portion.
Water transmitted from the panel flows toward the waterproof recess. This prevents water from penetrating into the cable penetrating tubular portion, and improves waterproofness.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an assembled state of a water stopping grommet according to an embodiment of the present invention, FIG. 2 is a sectional view showing a state before the soundproof film of the water stopping grommet is inverted, and FIG. FIG. 4 (a) is an explanatory view of the waterproof grommet viewed from the small-diameter cylindrical portion side.
Is an enlarged cross-sectional view of the cable penetration tube part of the water stop grommet,
FIG. 4B is an enlarged cross-sectional view of the cable through-tube portion when the post-processing is used.

As shown in FIGS. 1 and 2, the water stopping grommet 10 has a cylindrical small-diameter tube portion 11 into which a wire harness 18 is inserted, a cylindrical water stopping tube portion 12, and a substantially cylindrical large diameter. The cylindrical portion 13 is integrally formed of an elastic material such as rubber, and a cylindrical cable penetration cylindrical portion 14 through which a hood lock cable (cable) 19 is inserted between the small-diameter cylindrical portion 11 and the water-stopping cylindrical portion 12. Protruding large diameter cylindrical part 1
3 is formed with an annular recessed fitting groove (fitting portion) 13b fitted in the through hole 21 of the body panel (panel) 20 of the vehicle on the outer wall surface (outer peripheral surface) 13a.

The water-stopping cylinder 12 includes a small-diameter cylinder 11 and a large-diameter cylinder 1.
3 and is formed in a cylindrical shape. The boundary between the water stop cylinder 12 and the small diameter cylinder 11 is
The wall portions 15 which are vertically connected to the first and the second 12, respectively, are integrally formed. Further, an inner wall surface (inner peripheral surface) 12a of the water-stopping cylinder portion 12 is integrally formed with a rib 12b for preventing peeling of a sealant, and an inner wall surface 12a of the water-stopping cylinder portion 12 is formed.
A plurality of substantially triangular plate-like sealing agent peeling prevention ribs 12c are formed integrally with the inner wall surface of the wall portion 15 respectively. The space X formed by the inner wall surface 12a of the water blocking cylinder portion 12 and the outer peripheral surface of the wire harness 18 is filled with a liquid curable sealant 17.

The soundproof film 1 which is folded outward to form a soundproof air layer Y is formed on the end 12d of the waterstop cylinder 12.
6 are integrally formed. The soundproof film 16 includes a flexible portion 16a whose diameter is increased in a conical shape, and a cylindrical reversing portion 16c which is bent outward with respect to the flexible portion 16a via a reversing bending portion 16b. , This reversing part 16c
Is in close contact with the entire circumference of the inner wall surface (inner peripheral surface) 13c of the large-diameter cylindrical portion 13. Further, the reversing unit 16
On the inner wall surface of c (the surface that is bent to become the outer wall surface), a plurality of engaging projections (engaging portions) 13d integrally formed on the inner wall surface 13c of the large-diameter cylindrical portion 13 are engaged and disengaged. Are formed integrally with each other. As shown in FIGS. 1 and 2, each locking protrusion 16 of the reversing portion 16 c
The size of the soundproofing air layer Y can be varied depending on the locking position of the locking projection 13d of the large-diameter cylindrical portion 13 with the locking projection 13d.

Further, the cable penetrating cylindrical portion 14 is
2 are provided inside. That is, as shown in FIG. 1 and FIG.
4 is also used, and the cable penetrating cylindrical portion 14 is located inside the reversing portion 16c of the soundproof film 16 and both ends thereof are provided with the water stopping cylindrical portion 12 as shown in FIG. It is provided so as to protrude from the opening end 13e of the wall portion 15 and the large-diameter cylindrical portion 13. Further, an annular space Z for maintaining the flexibility of the large-diameter cylindrical portion 13 of the waterproof grommet 10 is secured between the soundproof film 16 and the wire harness 18.

As shown in FIGS. 1 to 4, the wall 15 below the cable penetrating cylinder 14 between the wall 15 of the water stopping cylinder 12 and the cable penetrating cylinder 14 extends left and right. A waterproof concave portion 15a having a U-shaped cross section is formed. FIG.
As shown in (b), when the cover portion 14b at the end of the cable penetrating tube portion 14 is cut and opened by post-processing, and the hole is used (due to a dealer article, etc., the front end of the cable penetrating tube portion 14 is used later). (When the cover 14b is cut and drilled for use), the amount of protrusion H of the cut portion can be minimized.

According to the water stopping grommet 10 of the embodiment described above, the reversing portion 16c is moved from the state before the reversing portion 16c of the soundproof film 16 shown in FIG.
When folded to the 3c side, as shown in FIG.
The leading end side of c is in close contact with the entire circumference of the inner wall surface 13c of the large-diameter cylindrical portion 13 without any gap. And the air layer Y for soundproofing is formed by the locking of each locking projection 16d of the reversing portion 16c and each locking projection 13d of the large-diameter cylindrical portion 13.

In this state, as shown in FIG. 1, a space X formed by the inner wall surface 12a of the water-stop cylinder portion 12 and the outer peripheral surface of the wire harness 18 is filled with a liquid curable sealing agent 17 to form a cylindrical shape. The inner wall surface 12a of the water-stop cylinder portion 12, the sealant peel-off preventing rib 12b protruding from the inner wall surface 12a of the water-stop cylinder portion 12, the inner wall surface 12a of the water-stop cylinder portion 12, and the wall portion 1
A plurality of substantially triangular plate-like sealant peeling prevention ribs 12c projecting from the inner wall surface of the seal member 5 increase the adhesive strength between the inner wall surface 12a of the water-stop cylinder 12 and the liquid-curable sealant 17.

In this embodiment, a part 1 of the water stop cylinder 12
2e and the part 14e of the cable penetration tube part 14 are also used to integrally form the cable penetration tube part 14 inside the water stop cylinder part 12, so that it is integrally formed with the end part 12d of the water stop cylinder part 12 and the outside. Insulation film 1 which is folded back to form air layer Y
6 is located on the inner wall surface 13 of the large-diameter cylindrical portion 13
c can be securely brought into close contact with the entire circumference without any gap. Accordingly, an air layer Y surrounded by the outer wall surface of the water-stop cylinder portion 12, the soundproof film 16, and the inner wall surface 13c of the large-diameter tube portion 13 can be secured inside the large-diameter tube portion 13, and the water-stop grommet is provided. 10
Can be improved in soundproofing. As a result, the air layer Y reliably prevents noise from being transmitted from the engine room to the vehicle interior via the waterproof grommet 10. The sound insulation between the cable through-tube portion 14 and the hood lock cable 19 is reliably performed by a pair of soundproof films 14a, 14a integrally formed in the cable through-tube portion 14.

Further, the cable penetration cylindrical portion 14 is
A plurality of locking projections 16d which are provided on the inner side of the flexible portion 16a and the reversing portion 16c, and which are locked to the plurality of locking projections 13d of the inner wall surface 13c of the large-diameter cylindrical portion 13 by the reversing portion 16c.
Are formed integrally with each other, so that the cable penetrating cylindrical portion 14 does not hinder the bending of the inverted portion 16c of the soundproof film 16, and any one of the bent raised portions 16d of the bent inverted portion 16c can have a large diameter. The reversing portion 16c of the soundproof film 16 is connected to the large-diameter cylindrical portion 13 by a simple operation of locking only one of the locking protrusions 13d on the inner wall surface 13c of the cylindrical portion 13.
Can be easily attached to the inner wall surface 13c side, and the inversion portion 16c of the soundproof film 16 can be reliably prevented from coming off. At this time, the inversion part 16 of the soundproof film 16 is used.
c of each of the locking projections 16d on the inner wall surface 1 of the large-diameter cylindrical portion 13.
By locking each of the locking projections 13c of 3c,
The air layer Y can be reliably secured inside the large-diameter cylindrical portion 13, and the soundproof performance of the water stopping grommet 10 can be further enhanced.

As shown in FIG. 4A, a waterproof recess 15a is formed in the wall 15 of the water stopping cylinder 12 below the cable penetration cylinder 14 so that the hood lock cable is formed in the cable penetration cylinder 14. The water transmitted from the upper part of the body panel 20 via the lower part 19 flows downward from the waterproof outflow concave part 15 a of the water stopping cylindrical part 12,
Do not penetrate inside. Thereby, invasion of water into the cable penetration tube part 14 can be reliably prevented, and the waterproofness can be further improved.

Further, since the portion 12e of the water-stopping tube portion 12 and the portion 14e of the cable penetration tube portion 14 are also used, the structure of this portion can be simplified, and the molding cost and component cost can be reduced. Can be. In addition, the small-diameter cylindrical portion 11
The water-stop grommet 10 is disposed between the water-stop grommet 10 and the large-diameter tube 13 so that the water-stop grommet 10 is
At the time of the assembling operation of penetrating and fitting the large-diameter tube 1, the large-diameter cylindrical portion 13 is easily deformed, and the assembling operation is facilitated.

Further, as shown in FIG. 4 (b), when the lid portion 14b at the end of the cable penetration tube portion 14 is cut and drilled by post-processing or the like for use, the protrusion amount H of the cut portion is used. 4 (a) and 4 (b) can be minimized, so that the cable penetrating cylindrical portion 14 does not hinder the tape winding operation between the small diameter cylindrical portion 12 and the wire harness 18. The tape winding operation can be easily performed.

According to the above-described embodiment, an example is shown in which the hood lock cable is inserted through the cylindrical cable penetration tube formed between the small-diameter tube and the water-stop cylinder. The cable penetrated through the cable is not limited to the hood lock cable, but may be another cable such as a bonnet release wire. Further, a plurality of cable penetration tube portions may be provided.

[0029]

As described above, according to the first aspect of the present invention, since the cable penetrating tubular portion is provided inside the water blocking tubular portion, it is provided at the end of the water blocking tubular portion and is folded outward. As a result, the tip side of the reversal portion of the soundproof film forming the air layer can be securely brought into close contact with the entire circumference of the inner peripheral surface of the large-diameter cylindrical portion without any gap. Thereby, the air layer can be reliably maintained inside the large-diameter cylindrical portion, and the soundproof performance of the water stopping grommet can be further enhanced.

According to the second aspect of the present invention, the cable penetrating tubular portion is provided inside the inverted portion of the soundproofing film, and is fixed to the inverted portion by the plurality of engaging portions on the inner peripheral surface of the large-diameter tubular portion. Since the plurality of locking portions are provided, the cable penetrating cylindrical portion does not hinder the bending of the inverted portion of the soundproof film, and any one of the bent inverted portions can be replaced with a large-diameter cylindrical portion. By simply engaging one of the locking portions on the inner peripheral surface of the large-diameter cylindrical portion, the inverted portion of the soundproof film can be easily mounted on the inner peripheral surface side of the large-diameter cylindrical portion. Can reliably be prevented from slipping out of the inversion portion.

According to the third aspect of the present invention, since the waterproof concave portion is provided between the cable penetrating tubular portion and the wall of the water stopping tubular portion,
Water transmitted from the panel can be surely flown to the waterproof concave side. Accordingly, it is possible to prevent water from entering the cable penetration tube portion, and it is possible to improve waterproofness.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a state before the soundproofing film of the waterproof grommet is inverted.

FIG. 3 is an explanatory view of the water stopping grommet as viewed from a small-diameter cylindrical portion side.

FIG. 4A is an enlarged cross-sectional view of a cable penetrating tubular part of the water stopping grommet, and FIG. 4B is an enlarged cross-sectional view of the cable penetrating tubular part in a case where it is used after being processed.

FIG. 5 is a cross-sectional view of a conventional waterproof grommet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Water stop grommet 11 Small diameter cylinder part 12 Water stop cylinder part 12d End part 13 Large diameter cylinder part 13a Outer wall surface (outer peripheral surface) 13b Fitting groove (fitting part) 13c Inner wall surface (inner peripheral surface) 13d Locking convex part ( Locking portion) 14 Cable penetrating cylindrical portion 15 Wall portion 15a Waterproof concave portion 16 Soundproof film 16c Inversion portion 16d Locking convex portion (locking portion) 17 Sealant 18 Wire harness 20 Body panel (panel) 21 Through hole X space Y Air layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 3/38 H02G 3/28 F

Claims (3)

[Claims] 1. A large-diameter cylinder having a small-diameter cylindrical portion and a large-diameter cylindrical portion into which a wire harness is inserted, and a cable penetration cylindrical portion between the small-diameter cylindrical portion and the large-diameter cylindrical portion. A fitting portion fitted into the through hole of the panel is provided on the outer peripheral surface of the portion, and a water-stop cylinder portion communicating with the small-diameter tube portion is provided inside the large-diameter tube portion. A water-proof grommet in which a sound-insulating film that is folded back outward to form an air layer is provided in a portion, and a space formed by the water-stop cylinder portion and the wire harness is filled with a liquid curable sealant; A water stopping grommet, wherein a portion is provided inside the water stopping cylinder portion, and a tip side of a reversing portion of the soundproofing film is allowed to come into close contact with an inner peripheral surface of the large diameter tube portion. 2. The water stopping grommet according to claim 1, wherein the cable penetrating tubular portion is provided inside an inverted portion of the soundproof film, and the inverted portion has a plurality of inner peripheral surfaces of the large-diameter tubular portion. A waterproof grommet comprising a plurality of locking portions locked to the locking portions. 3. The waterproof grommet according to claim 1, wherein a waterproof recess is provided between the cable penetrating tubular portion and a wall formed at a boundary between the small-diameter tubular portion of the waterproof tubular portion. Water-stop grommet characterized by the following.