JPH08140246A - Grommet - Google Patents

Abstract

PURPOSE: To enhance the sealability between a grommet and a through hole provided in a panel and to prevent water from entering a car room by providing an annular substance of a semicircular cross section having a plurality of thin parts separated at required intervals in the circumferential direction, and having an outside hem on the tip side of a lip part and having an inside hem on one sidewall side of a fastening-by-hooking groove. CONSTITUTION: An annular member 13 has a plurality of thin parts provided at required intervals in the circumferential direction. If pressure is applied to the outside hem of the annular member 13, the thin parts deflect, and the whole of the inside hem of the annular member 13 protrude outward in the radial direction. Besides, the lip part 18 of a grommet body 12 and one sidewall of a fastening-by-hooking groove 14a adhere closely to a panel 2, and they are in a double sealed state. As a result of this, it becomes possible to seal a grommet 11 and a through hole 2a surely, and to prevent water from entering a car room surely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet mounted in a through hole for inserting a wire harness provided in a panel of an automobile or the like, and more particularly to improving the sealing property of the grommet.

[0002]

2. Description of the Related Art In a wire harness for an automobile, when the wire harness is passed through a through hole provided in a vehicle body or a panel of a device, the wire harness is previously inserted into a wire harness insertion hole provided in a grommet made of an elastic material such as rubber. After being inserted, the grommet is attached to the through hole in this state for waterproofing.

For example, as shown in FIG. 7, a wire harness W / H arranged from a luggage room 1 of an automobile to a fail pump (not shown) has a through hole 2a provided in a panel 2 of a vehicle body. The grommet 3 is attached to the through hole 2a.

As shown in FIG. 8, the grommet 3 has a cylindrical shape having a large-diameter portion 4 provided with a locking groove 4a into which the edge portion of the through hole 2a is fitted, and a wire harness insertion hole 5a, as shown in FIG. It has a small diameter portion 5a. Also, the above grommet 3
A lip 6 is formed on one side of the panel locking groove 4a. By abutting the lip portion 6 on the surface 2b on the outside A side of the panel 2 while being elastically pressed, the gap between the grommet 3 and the through hole 2a is sealed, and the inside of the luggage room 1 from the outside side A ( Water in the vehicle compartment B) is prevented.

[0005]

However, if only one lip 6 is provided around the engaging groove 4a as described above, for example, when a high-pressure jet flow is applied to the grommet 3 due to high-pressure car washing. The lip portion 6 is flipped up as shown by an arrow C in the figure, a gap is created between the panel 2 and the tip of the lip portion 6, and water may enter the vehicle compartment B from the outside A.

The present invention solves the above problems in the conventional grommets, improves the sealing performance between the grommets and the through holes formed in the panel of the vehicle body, and reliably prevents the entry of water into the vehicle interior. It was made for the purpose of doing.

[0007]

Therefore, a first aspect of the present invention is to provide an annular locking groove that engages with an edge portion of a through hole formed in a panel.
A grommet main body having an insertion hole for inserting a wire harness and a lip portion provided around the locking groove, a semicircular arc-shaped cross section, and a plurality of thin-walled portions at required intervals in the circumferential direction, Provided is a grommet including an annular body arranged in the grommet body such that an outer edge portion is located on the tip side of the lip portion and an inner edge portion is located on one side wall side of the locking groove. .

According to a second aspect of the present invention, an annular locking groove that engages with an edge of a through hole provided in the panel, an insertion hole through which the wire harness is inserted, and a lip portion provided around the locking groove. And a grommet body having a soft portion on one side wall of the locking groove, and a plurality of thin-walled portions having a semicircular arc-shaped cross section and spaced at required intervals in the circumferential direction, and the outer edge portion having the lip portion. A grommet is provided in the grommet main body so that the inner edge is provided with the soft part of the locking groove and is located on the side wall side.

[0009]

When the grommet according to claim 1 is attached to the through hole,
As the lip of the grommet body is pressed against the panel, the annular body is deformed so that the outer end opens outward and the inner end projects. Therefore, the lip portion of the grommet body is pressed against the panel by the outer edge portion of the annular body to be in close contact, and the side wall of the locking groove is pressed against the panel by the inner edge portion of the annular body to be in close contact.

When the grommet according to claim 2 is mounted in the through hole, the lip portion of the grommet body is pressed against the panel by the outer edge portion of the annular body so as to be in close contact, and the side wall of the locking groove is the inner edge portion of the annular body. Is pressed against the panel and comes into close contact. Further, since the soft portion is provided on one side wall of the locking groove, the degree of adhesion of the side wall to the panel is high.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in the drawings. 1 to 4 show a first embodiment of the present invention.
An example is shown. As shown in FIGS. 1A and 1B, the grommet 11 according to the first embodiment includes a grommet body 12 and an annular body 13. Grommet body 1
2 is made of a rubber-based elastic material such as EPDM, CR, NBR.

The grommet body 12 has a large-diameter portion 14 having an annular locking groove 14a on the outer periphery for engaging with the edge of the through hole 2a formed in the panel 2, and an insertion hole for inserting the wire harness W / H. The small-diameter portion 15 including the small-diameter portion 15a is provided, and the large-diameter portion 14 and the small-diameter portion 15 are integrally formed via the connecting portion 16 so as to be located on the same axis L.

Further, as shown in detail in FIG. 2, a pair of side walls 14b, 14 of the locking groove 14a provided in the large diameter portion 14 are provided.
Of c, the side wall 14b located on the outside A (outside the vehicle) when the grommet 11 is attached to the insertion hole 2a of the panel 2.
A lip portion 18 that surrounds the periphery of the locking groove 14a is formed on the side.

The annular body 13 is made of a resin such as PP, PA, ABS or the like, and has a semicircular arc cross section as shown in FIGS. 3 (A) and 3 (B).

Further, the annular body 13 is provided with a plurality of thin wall portions 13a, 13a, 13a ... At predetermined intervals in the circumferential direction, and a plurality of arcs connected by the thin wall portions 13a, 13a, 13a. The parts 13b, 13b, 13b ... Form a single ring. Therefore, the outer edge 1 of the annular body 13
When a force pressing outward is applied to the entire 3c as indicated by arrow E in the figure, the thin portion 13a is bent, and as shown by arrow F, the entire inner edge portion 13d of the annular body 13 has a diameter. Protrude outward in the direction.

The annular body 13 is disposed in the grommet main body 12 by insert molding as described later, the outer edge portion 13c is located at the tip end side of the lip portion 18, and the inner edge portion 13d is the engaging portion. It is located on one side wall 14b side of the stop groove 14a.

When molding the grommet of the first embodiment, first, as described above, the ring 13 is formed by resin molding.
Then, the molded annular body 13 is set in a mold for molding the grommet body 12, the rubber system is filled, and the annular body 13 is insert-molded in the grommet body 12.

Next, a method of using the grommet of the first embodiment will be described. When using this grommet 11, first, the wire harness insertion hole 1 of the small diameter portion 15 is used.
The diameter of 5a is expanded by a jig (not shown), and the wire harness W / H is inserted. In addition, the inserted wire harness W /
The adhesive tape 20 is wound around H and the small diameter portion 15 to fix the grommet 11 to the wire harness W / H. Next, the edge portion of the through hole 2a is engaged with the locking groove 14a provided in the large diameter portion 14 so that the small diameter portion 15 projects toward the vehicle compartment (inside) of the vehicle. At this time, as shown in FIG.
Is pressed against the lip portion 18 of the grommet main body 11, and the outer edge portion 13 of the annular body 13 located at the tip portion of the lip portion 18 is opened outward as indicated by arrow E. The force to do so acts. Therefore, the thin-walled portions 13a, 13a, 13a ... Are bent and the outer edge portion 13c of the annular body 13 is pushed downward in FIG. 4, while the inner edge portion 13d is moved upward in FIG. I try to stick to the side. Therefore, the lip portion 18 of the grommet main body 12 is pressed against the panel 2 by the outer edge portion 13c of the annular body 13, and the side wall 14b of the locking groove 14a.
Are pressed against the panel 2 by the inner edge 13e of the annular body 13. Thus, when the grommet 11 of the first embodiment is mounted on the panel 2, the lip portion 18 of the grommet main body 12 and one side wall of the locking groove 14a shown by 14b come into close contact with the panel 2 and, so to speak, a double seal. It becomes a state.
Therefore, in the grommet of the first embodiment, the grommet 1
1 and the through hole 2a can be reliably sealed, and even when a high-speed jet is received from the outer side A of the panel 2 during high-pressure car washing, etc., the water can surely enter the vehicle compartment side B. Can be prevented.

Next, a second embodiment shown in FIGS. 5 and 6 will be described. Grommet 11 'according to the second embodiment
Then, the annular body 1 of the one side wall 14b of the locking groove 14a.
3 has an annular soft portion 2 at a position facing the inner edge portion 13d.
0 is provided. This soft part 20 is the grommet body 1
Similar to item 2, it is made of a rubber-based elastic material such as EPDM, CR, NBR, etc., but by adjusting the composition and composition thereof, it is made more flexible and more elastic than the grommet body 12. Since the other structure of the grommet 11 'of the second embodiment is similar to that of the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

When the grommet 11 'of the second embodiment is attached to the panel 2, the lip portion 18 of the grommet body 12 is pressed against the panel 2 as shown in FIG.
The outer edge 13c of the annular body 13 is pushed downward in FIG. 6, while the inner edge 6 is pushed upward in FIG. Therefore, the lip portion 18 of the grommet body 12 is pressed against the panel 2 by the outer edge portion 13c of the annular body 13 so as to be in close contact with the side wall 1 of the locking groove 14a.
The soft portion 20 provided at 4b is the inner edge portion 13d of the annular body 13.
As a result, it is pressed against the panel 2 and comes into close contact therewith, so to speak of a double seal. Therefore, the grommet 11 'and the through hole 2a are reliably sealed, and even when a high-speed jet is applied from the outside A of the panel 2 during high-pressure car washing, the entry of water into the passenger compartment B is ensured. Can be prevented.
Particularly, in the second embodiment, the side wall 14b of the locking groove 14a facing the inner edge 13d of the annular body 13 as described above.
In addition, since the soft portion 20 is provided, the adhesiveness to the panel 2 is high, and it is possible to more reliably prevent the entry of moisture into the vehicle interior side.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, the grommet body 12 is not limited to a rubber-based elastic material, but a vinyl chloride-based TPE, an olefin-based TPE, a styrene-based TP.
It may be formed of an elastomer-based material such as E. Further, the annular body 13 may be formed of a metal such as aluminum or steel.

[0022]

As is apparent from the above description, when the grommet according to claim 1 is mounted in the through hole, the lip of the grommet body is pressed against the panel, so that the outer end of the annular body opens outward and the inner side of the annular body opens. It deforms so that the ends protrude. Therefore, the lip portion of the grommet body is pressed against the panel by the outer edge portion of the annular body so that the side wall of the locking groove is pressed against the panel by the inner edge portion of the annular body. It becomes a heavy seal. Therefore, the gap between the grommet and the through hole is surely sealed, and even when a high-speed jet flow is applied from the outside of the panel during high-pressure car washing or the like, it is possible to reliably prevent water from entering the passenger compartment.

When the grommet is mounted in the through hole, the lip portion of the grommet main body is pressed against the panel by the outer edge portion of the annular body so as to be in close contact, and the side wall of the locking groove is the inner edge portion of the annular body. As a result, it is pressed against the panel and comes into close contact with it, resulting in a double seal. In addition, claim 2
Then, since the soft portion is provided on one side wall of the locking groove, the degree of adhesion of the side wall to the panel is high. Therefore, with the grommet according to the second aspect, the gap between the grommet and the through hole is more surely sealed, and it is possible to more reliably prevent water from entering the vehicle interior side.

[Brief description of drawings]

FIG. 1A is a perspective view showing a grommet according to a first embodiment of the present invention, and FIG. 1B is a sectional view taken along line I-I of FIG.

FIG. 2 is a partially enlarged view of a portion II of FIG.

3A is a perspective view showing a ring-shaped body, and FIG. 3B is a sectional view taken along line III-III of FIG. 3A.

FIG. 4 is a partially enlarged cross-sectional view showing a state in which the grommet of the first embodiment is attached to the through hole.

FIG. 5 is a partially enlarged cross-sectional perspective view showing a grommet according to a second embodiment of the present invention.

FIG. 6 is a partially enlarged cross-sectional view showing a state in which the grommet of the second embodiment is attached to the through hole.

FIG. 7 is a perspective view showing an example of a place where a grommet is used.

FIG. 8 is a sectional view showing a conventional grommet.

[Explanation of symbols]

 2 panel 2a through hole 11, 11 'grommet 12 grommet body 13 annular body 13a thin portion 13c outer edge 13d inner edge 14 large diameter portion 14a locking groove 15 small diameter portion 15a insertion hole 18 lip portion 20 soft portion W / H Wire harness

Claims (2)

[Claims] 1. An annular locking groove that engages with an edge portion of a through hole provided in a panel, and an insertion hole through which a wire harness is inserted,
A grommet body having a lip portion provided around the locking groove, a semi-circular cross-section, and a plurality of thin-walled portions that are spaced apart at required intervals in the circumferential direction, and the outer edge portion has a tip end side of the lip portion. And a ring-shaped body disposed inside the grommet body such that the inner edge portion is located on one side wall side of the locking groove. 2. An annular locking groove that engages with an edge portion of a through hole provided in a panel, and an insertion hole that inserts a wire harness,
A grommet main body having a lip portion provided around the locking groove, and a soft portion provided on one side wall of the locking groove; and a plurality of semicircular arc-shaped cross sections with a required interval in the circumferential direction. And an annular body arranged in the grommet main body so that the outer edge portion is located on the tip side of the lip portion and the inner edge portion is provided on the side wall side with the soft portion of the locking groove provided. Prepared grommet.