JP2677924B2 - Grommet - Google Patents

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 attached to a vehicle panel and holds a wire harness which passes through the panel.

[0002]

2. Description of the Related Art When inserting a wire harness into a mounting hole provided in a panel, the wire harness is attached to the panel via a grommet in order to prevent the wire harness from being damaged at the periphery of the panel mounting hole. A method has been proposed. Among such grommets, one shown in FIG. 5 is one of so-called two-body grommets for sandwiching and fixing the panel from both sides (actual flat part 2-461).
No. 86).

This grommet 1 is, as shown in FIG.
It consists of a hard grommet 3 and a soft grommet 5. The hard grommet 3 is formed of a synthetic resin into a substantially cylindrical shape, and an insertion hole 7 through which the wire harness W is inserted is provided at the center of the hard grommet 3. Further, a flange portion 9 is provided on the outer circumference of one end of the hard grommet 1 in a direction perpendicular to the axial direction, and four flexible locking arms 11 are equidistantly provided on the outer circumference of the other end. It is provided (however, only two flexible locking arms 11 are shown in FIG. 5). Locking step portions 13 are formed at the distal ends of these flexible locking arms 11.

On the other hand, the soft grommet 5 is composed of a cylindrical base portion 15 having an insertion hole 21 through which the wire harness W is inserted, and an elastic seal portion 17 provided on the outer periphery of the base portion 15. These are integrally formed by a rubber member. Further, a fitting recess 19 into which the flange portion 9 of the hard grommet 3 is fitted is formed between the inner wall of the base portion 15 and the elastic seal portion 17.

By fitting the flange portion 9 of the hard grommet 3 in the fitting recess 19 of the soft grommet 5, the hard grommet 3 and the soft grommet 5 are integrated.
Further, when the hard grommet 3 integrated with the soft grommet 5 is inserted into the mounting hole 23 formed in the panel P, the flexible locking arm 11 projects to the opposite side of the panel P,
The locking step portion 13 is locked to the opening edge portion of the mounting hole 23, and the elastic seal portion 17 contacts the panel P in a bent state. In this state, the panel P is sandwiched between the flexible locking arm 11 and the elastic seal portion 17, and the grommet 1 is fixed to the panel P.

[0006]

By the way, FIG. 6 (a)
As shown in, the flange portion 9 is fitted into the fitting recess 19 so that the outer peripheral portion of the soft grommet 5 wraps the flange portion 9 of the hard grommet 3 from the outside. For this reason, when assembling the grommet 1 to the vehicle (especially the work of penetrating the wire harness from the fender side to the engine room side)
Moreover, when the outer peripheral end 5a of the soft grommet 5 is rubbed with the body, the outer peripheral end 5a may ride on the flange 9 as shown in FIG. When the grommet 1 is attached to the vehicle in such a blind state, there is a problem that the prevention performance is significantly lowered, and in the worst case, the waterproof property is lost.

In view of the above circumstances, it is an object of the present invention to provide a grommet capable of preventing a state in which the outer peripheral portion of a soft grommet gets on a hard grommet.

[0008]

To achieve the above object, the invention according to claim 1 fits in a panel mounting hole and has a locking step portion which is engaged with an opening edge portion of the mounting hole. And a hard grommet integrally formed on the outer peripheral portion of the flexible locking arm of the portion, and is integrated with the hard grommet by a coupling means, and abutting on the opening peripheral edge of the mounting hole, the hard grommet described above. In a grommet consisting of a soft grommet integrally provided at the outer peripheral end with a seal part for sandwiching the panel with the flexible locking arm, a circle in which an insertion hole through which a wire harness is inserted is formed in the center part. The soft grommet is formed from a plate-shaped base portion and a flexible plate portion that is integrally formed on the outer periphery of the base portion and presses the seal portion of the outer peripheral end portion toward the panel, and the outer periphery is formed from the insertion hole. Radiate towards It is characterized in a reinforcing rib extending to the formation in the base and the flexible plate.

[0009]

According to the first aspect of the invention, the soft grommet and the hard grommet are connected by the connecting means to be integrated. When the grommet is attached to the panel mounting hole in this state, the grommet can be fixed to the panel by sandwiching the panel between the flexible locking arm and the seal portion. In this case, since the flexible plate portion presses the seal portion toward the panel, it is possible to seal between the panel and the grommet. Further, by providing the reinforcing ribs on the flexible plate portion and the base portion, the pressing force of the sealing portion against the panel becomes stronger, and the sealing performance is further improved.

[0010]

Embodiments of the grommet according to the present invention will be described below with reference to the drawings.

1 and 2 show a grommet 29 consisting of a hard grommet 25 and a soft grommet 27. The soft grommet 27 of the present embodiment has a disc-shaped base portion 2 having an insertion hole 21 through which the wire harness W is inserted in the central portion thereof.
7a and a flexible plate portion 27b extending from the base portion 27a
And are integrally formed.

An elastic seal portion 31 is formed inside the outer periphery of the flexible plate portion 27b so that the front end portion gradually becomes thinner. The inner wall 33a is provided with a fitting recess 33 that is open to the inside and outward of the elastic seal portion 31.
The flexible plate portion 2 is used as a starting point near the root of the fitting recess 33.
7b is flexible. Further, on the outer periphery of the soft grommet 27, a plurality of reinforcing ribs 37 extending radially extending from the base portion 27a to the flexible plate portion 27b are formed.

On the other hand, in the hard grommet 25 of this embodiment, the flange portion 35 is directed inward from the flexible locking arm 11.
Are formed. Further, the fitting concave portion 33 and the flange portion 35 constitute a coupling means.

Next, the procedure for assembling the grommet 29 and the procedure for attaching the assembled grommet 29 to the panel will be described.

First, the flange portion 3 of the hard grommet 25.
5 is fitted in the fitting recess 33 of the soft grommet 27 to integrate the hard grommet 25 and the soft grommet 27. When the hard grommet 25 is inserted into the mounting hole 23 of the panel P, the flexible locking arm 11 projects to the opposite side of the panel P, and the locking step 13 is locked to the opening edge of the mounting hole 23. At the same time, the tip end of the elastic seal portion 31 contacts the panel P, and sandwiches the panel P with the flexible locking arm 11. Thereby, the grommet 11 can be fixed to the panel P. At this time, the flexible plate portion 27b bends toward the opposite side of the fitting concave portion 33 starting from the vicinity of the root of the fitting concave portion 33 and presses the tip end of the elastic seal portion 31 toward the panel P. As a result, the space between the panel P and the soft grommet 27 is sealed.

In this case, even when the outer peripheral portion of the soft grommet 27 is rubbed with the body or the like during the assembling work to the vehicle, the elastic seal portion 31 does not ride on the flange portion 35. That is, in the grommet 29 of the present embodiment, the fitting recess 33 provided in the soft grommet 27 is opened inside and outward of the elastic seal portion 31 and fits into the fitting recess 33. Since the flange portion 35 of the hard grommet 25 is formed toward the inside of the flexible locking arm 11, even if the outer periphery of the soft grommet 27 is rubbed, the flange portion 35 does not come off from the fitting recess 33.

Further, in this embodiment, since the elastic seal portion 31 is pressed toward the panel by the flexible plate portion 27b,
This also makes it possible to prevent the soft grommet 27 from being scraped. Therefore, the integrated grommet 2
The waterproof performance of No. 9 does not deteriorate, and it is possible to ensure waterproofing.

Furthermore, since the plurality of reinforcing ribs 37 are formed on the soft grommet 27 of this embodiment from the base portion 27a to the flexible plate portion 27b, the pressing force of the elastic seal portion 31 against the panel P is increased. , This also ensures waterproofing.

Further, the hard grommet 25 of this embodiment is
Since it is not a two-divided piece but an integrated piece, it has high strength when the panel P is sandwiched in a state of being integrated with the soft grommet 27. Further, since the hard grommet 25 is integrally formed, the number of parts does not increase, and the number of man-hours is reduced during the assembly work with the soft grommet 27, so that the manufacturing cost can be reduced.

Further, in the grommet 29 of this embodiment, since the flexible plate portion 27b extends from the disk-shaped base portion 27a, the reinforcing rib 3 extends from the base portion 27a to the flexible plate portion 27a.
When 7 is provided, the reinforcing effect is great, the elastic seal portion 31 can be pressed toward the panel P with a stronger force, and the waterproof performance can be improved.

Next, another embodiment will be described with reference to FIG. In this embodiment, the means for connecting the hard grommet 25 and the soft grommet 27 is different. As shown in FIG. 4, a through hole 25a is formed in the hard grommet 25, and the engaging pin 39 has a soft grommet 2 corresponding to the through hole 25a.
7 is formed.

The hard grommet 25 and the soft grommet 27 can be integrated by inserting and engaging the engaging pin 39 into the through hole 25a.

Also in this embodiment, since the flexible plate portion 27b bends starting from the vicinity of the root of the engaging pin 39, the elastic seal portion 31 is pressed against the panel P and sealed.

Also in this embodiment, as in the above-mentioned embodiment, the elastic seal portion 31 does not turn up on the hard grommet 25, and reliable waterproofing is possible.

[0025]

As described above, according to the grommet according to the present invention, the disk-shaped base portion having the insertion hole through which the wire harness is inserted is formed in the central portion, and is integrally formed on the outer periphery of the base portion. In addition, since the soft grommet is formed from the flexible plate part that presses the elastic seal part of the outer peripheral end toward the panel, it is possible to prevent the outer peripheral end of the soft grommet from climbing over the hard grommet. . Therefore, reliable waterproofing is possible.

Furthermore, the rigidity of the flexible plate portion can be improved by providing the reinforcing ribs radially from the disk-shaped base portion to the flexible plate portion, and the pressing force of the elastic seal portion against the panel is increased. Therefore, more reliable waterproof performance can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a grommet.

FIG. 3 is an enlarged view showing a flange portion of a hard grommet and a fitting concave portion of a soft grommet, FIG. Is.

FIG. 4 is a sectional view showing another embodiment.

FIG. 5 is a cross-sectional view showing a conventional grommet.

FIG. 6 is an enlarged view of a flange portion and a fitting concave portion of a conventional grommet, (a) is a sectional view showing a state where the flange portion is fitted in the fitting concave portion, and (b) is an elastic seal portion. FIG. 7 is a cross-sectional view showing a state in which the flange is turned up.

[Explanation of symbols]

 11 flexible locking arm 13 locking step 21 insertion hole 23 mounting hole 25 hard grommet 27 soft grommet 27a base 27b flexible plate part 29 grommet 31 elastic seal part 33 fitting recess 35 flange part 37 reinforcing rib

Claims (1)

(57) [Claims] 1. A flexible locking arm which is fitted in a panel mounting hole and has a locking step portion at a tip end portion which engages with an opening edge portion of the mounting hole is integrally formed on an outer peripheral portion. A hard grommet and a seal part that is integrated with the hard grommet by a coupling means and that abuts on the peripheral edge of the opening of the mounting hole to sandwich the panel between the flexible grommet and the flexible locking arm. In a grommet consisting of a soft grommet integrally provided at the outer peripheral end, a disc-shaped base portion having an insertion hole for inserting a wire harness formed in the center portion, and an integrally formed outer periphery of the base portion, The flexible grommet is formed from a flexible plate portion that presses the seal portion of the outer peripheral end portion toward the panel,
A grommet characterized in that reinforcing ribs radially extending from the insertion hole toward the outer periphery are formed in the base portion and the flexible plate portion.