JP2001006466A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring an annular groove into close contact with the inner circumferential edge of an opening hole by forming at least the bottom of the annular groove into the same shape as that of a bent portion of the opening hole. SOLUTION: Since the bottom 12a of an annular groove is formed into the same shape as that of an inner circumferential edge 17a of an opening hole, the bottom 12a and the inner circumferential edge 17a can correspond with each other when the groove 12 is fitted to the opening hole 17, and it can be brought into close contact with the inner circumferential edge 17a. As a result, even if a load is applied to a grommet 11 owing to an abrupt bending of a wire harness 15, the close contact therebetween can be maintained, thereby preventing deterioration of water resistance of the wire harness. Furthermore, when a cylindrical large diameter part 13 is formed in an elliptical shape and it is fitted to the opening hole 17 of an elliptical shape, it is possible to prevent rotation of the grommet 11 with respect to a vehicle body pannel 16 and the water resistance of the wire harness 15 can be maintained well through maintaining contact of the groove 12 and the edge 17a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a grommet,
Specifically, when a wire bundle such as a wire harness is inserted into an opening of a panel of a vehicle body, an electric device, or the like, while preventing the wire harness from coming into contact with the opening, water or the like enters the panel through the opening. The present invention relates to a grommet that can prevent intrusion.

[0002]

2. Description of the Related Art Generally, when a wire bundle such as a wire harness is inserted into an opening hole formed in a panel that partitions the outside and inside of a vehicle body, the opening hole and the wire harness are prevented from coming into contact with each other. A grommet is used to prevent the like from entering a panel (room) from a gap between an opening hole and a wire harness.

A conventional grommet of this type is shown, for example, in FIGS. 3 and 4, 1
The grommet 1 has a cylindrical large-diameter portion 2 having an outer peripheral portion formed with an annular groove 2a to be fitted into an opening 5a of a panel 5 of a vehicle body or an electric device, and the like. And a long cylindrical small diameter portion 3 protruding from the portion 2 and through which a wire harness 4 can be inserted.

In the grommet 1, after the wire harness 4 is inserted through the cylindrical large-diameter portion 2 and the cylindrical small-diameter portion 3, the grommet 1 is inserted into the opening hole 5a from the cylindrical small-diameter portion 3 side.
By fitting a into the opening hole 5a, the inside and outside of the vehicle body are liquid-tightly sealed. In addition, usually, in order to achieve waterproofness of the wire harness 4, the cylindrical small diameter portion 3 side is located outside the room.

[0005]

However, in such a conventional grommet 1, when the annular groove 2a of the grommet 1 is fitted into the opening 5a, the inner peripheral edge of the annular groove 2a and the opening 5a. Since the shapes do not match, the following problem has occurred.

That is, the inner peripheral edge A of the opening 5a is oriented in the insertion direction of the small cylindrical portion 3 indicated by an arrow in FIG. 3 (a) so that the grommet 1 can be smoothly attached to the opening 5. It is bent.

However, since the conventional annular groove 2a is not formed in conformity with the shape of the inner peripheral edge A of the opening 5a, when the annular groove 2a of the grommet 1 is fitted into the opening 5a, as shown in FIG. b) Since the inner peripheral edge of the annular groove 2a does not coincide with the inner peripheral edge of the opening hole 5a as shown in (c), when the opening hole 5a and the large cylindrical portion 2 are elliptical, the grommet 1 is And a gap is formed between the inner peripheral edge A of the opening 5a and the annular groove 2a.
However, there is a problem that the waterproofness is reduced.

Further, the conventional annular groove 2a is in contact with the inner peripheral edge A in a narrow area of two points, that is, a bottom part a and an upper part b.
As shown in FIG. 5A, when the wiring harness 4 is in a wiring state in which the wiring harness 4 is sharply bent upward, FIG.
As shown in (b), the large-diameter cylindrical portion 2 is deformed so that the upper part of the annular groove 2a moves clockwise with the lower part of the annular groove 2a as a fulcrum. As a result, the inner peripheral edge of the opening 5a is formed. There is a problem that a gap is generated between the wire harness A and the annular groove 2a, and the waterproofness of the wire harness 4 is reduced.

Accordingly, the present invention provides an annular groove that can be fitted at least to the inner peripheral edge of the opening when the annular groove is fitted into the opening. It is an object of the present invention to provide a grommet that can adhere to a large area in a wide area and can prevent the sealing performance from being reduced when a load is applied in a predetermined direction.

[0010]

According to the first aspect of the present invention,
In order to solve the above-mentioned problem, a grommet which can be attached to a counterpart member whose inner peripheral edge of an opening hole is bent in a predetermined direction, and an annular groove which is fitted to the opening hole is formed on an outer peripheral portion. A grommet having a cylindrical large-diameter portion and a cylindrical small-diameter portion protruding from the cylindrical large-diameter portion, and capable of mounting a wire bundle on an inner peripheral portion of the cylindrical large-diameter portion and the cylindrical small-diameter portion. Wherein at least the bottom of the annular groove is formed in the same shape as the bent portion of the opening.

In this case, since at least the bottom of the annular groove is formed in the same shape as the bent portion of the opening, when the annular groove is fitted into the opening, the bottom of the annular groove and the inner peripheral edge of the opening are formed. Can be fitted to the inner peripheral edge of the opening hole, so that the annular groove can be in close contact with a large area, and even if a load is applied to the grommet due to sudden bending of the wire bundle, the annular groove and the opening Adhesion of the inner peripheral edge of the hole can be maintained, and deterioration of the waterproofness of the wire bundle can be prevented.

According to a second aspect of the present invention, in order to solve the above-mentioned problem, in the first aspect of the present invention, the large-diameter cylindrical portion is elliptical.

[0013] In this case, when the annular groove is fitted into the elliptical opening, the annular groove can be brought into close contact with the inner peripheral edge of the opening over a wide area. It is possible to prevent the wire bundle from rotating, and to maintain the close contact between the annular groove and the inner peripheral edge of the opening hole to prevent the waterproof property of the wire bundle from deteriorating.

[0014]

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

FIGS. 1 and 2 show an embodiment of a method of using the grommet according to the present invention.

First, the configuration will be described. 1 and 2, reference numeral 11 denotes a grommet. The grommet 11 has a cylindrical large-diameter portion 13 having an annular groove 12 formed in an outer peripheral portion thereof so as to be fitted into an opening hole 17 of a vehicle body panel (partner member) 16. And a small cylindrical portion 14 protruding from the large cylindrical portion 13 and through which a wire harness (wire bundle) 15 is inserted.

The opening 17 has an elliptical shape, and the large-diameter cylindrical portion 13 and the annular groove 12 have an elliptical shape so as to fit into the opening 17. Also, the inner peripheral edge 17 of the opening hole 17
a is bent, and the bending direction of the inner peripheral edge 17a, which is the bent portion, is directed toward the outdoor side.

Further, at least the bottom 12a of the annular groove 12 is formed in the same shape as the inner peripheral edge 17a of the opening hole 17.

To attach the wire harness 15 to the grommet 11 having such a configuration, the wire harness 15 is inserted through the cylindrical large-diameter portion 13 and the cylindrical small-diameter portion 14, and then the grommet 11 is connected to the cylindrical small-diameter portion 14 side. Through the opening hole 17 through the annular groove 12
Into the opening hole 17. In addition, since the bending direction of the inner peripheral edge 17a is toward the outdoor side, the large cylindrical portion 12 can be smoothly inserted into the opening hole 17 along the inner peripheral edge 17a.

In this embodiment, since the bottom 12a of the annular groove 12 is formed in the same shape as the inner peripheral edge 17a of the opening 17, the annular groove 12
Is fitted into the opening 17, the bottom 12 a of the annular groove 12 and the inner peripheral edge 17 a of the opening 17 can be matched, and the inner peripheral
The annular groove 12 can be brought into close contact with 17a over a wide area.

Therefore, even when a load is applied to the grommet 11 due to the sharp bending of the wire harness 15, the adhesion between the annular groove 12 and the inner peripheral edge 17a can be maintained, and the waterproofness of the wire harness 15 can be maintained. Can be prevented from becoming worse.

When the cylindrical large-diameter portion 13 is formed into an elliptical shape and the cylindrical large-diameter portion 13 is fitted into the elliptical opening hole 17, the annular groove 12 has a large area with respect to the inner peripheral edge 17a. The grommet 11 can be prevented from rotating with respect to the vehicle body panel 16 and the annular groove 12 can be prevented.
And the inner peripheral edge 17a can be kept in close contact with each other to prevent the waterproof property of the wire harness 15 from deteriorating.

[0023]

According to the first aspect of the present invention, at least the bottom of the annular groove is formed in the same shape as the bent portion of the opening, so that when the annular groove is fitted into the opening,
The bottom of the annular groove can be aligned with the inner periphery of the opening, the annular groove can be in close contact with the inner periphery of the opening over a wide area, and a sudden bending of the bundle of wires applied a load to the grommet. Even in this case, it is possible to maintain the close contact between the annular groove and the inner peripheral edge of the opening hole, and prevent the waterproofness of the wire bundle from deteriorating.

According to the second aspect of the present invention, when the annular groove is fitted into the elliptical opening, the annular groove can be brought into close contact with the inner peripheral edge of the opening over a wide area. The grommet can be prevented from rotating with respect to the counterpart member, and the tightness between the annular groove and the inner peripheral edge of the opening can be maintained to prevent the waterproofness of the wire bundle from deteriorating. .

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a grommet according to the present invention, in which (a) is an external view of an opening hole portion and a grommet of a vehicle body panel, and (b) is a cross-sectional view of the grommet.

2A is a diagram showing a state in which the grommet of one embodiment is mounted on a vehicle body panel, and FIG. 2B is an enlarged cross-sectional view of a portion B in FIG.

3A is an external view of an opening hole portion of a vehicle body panel and a conventional grommet, and FIG. 3B is a diagram illustrating a state where the conventional grommet is mounted on the vehicle body panel.

4A is a cross-sectional view of a grommet showing a state in which a conventional grommet is inserted into an opening hole, FIG. 4B is a cross-sectional view of a grommet in a state where an annular groove is fitted in the opening hole, and FIG. It is an expanded sectional view of the A section of Drawing (b).

5A is a cross-sectional view illustrating a deformed state of the grommet when the wire harness is bent upward, and FIG. 5B is a diagram illustrating upper and lower ends of the grommet and an opening hole in the state of FIG. It is a figure which shows a periphery.

[Explanation of symbols]

 11 Grommet 12 Annular groove 13 Cylindrical large diameter part 14 Cylindrical small diameter part 15 Wire harness (wire rod bundle) 16 Body panel (counterpart member) 17 Opening hole

Claims (2)

[Claims] 1. A grommet mountable on a mating member having an inner peripheral edge of an opening hole bent in a predetermined direction, wherein the outer peripheral portion has an annular groove formed therein to be fitted into the opening hole. A grommet having a diameter portion and a cylindrical small-diameter portion protruding from the cylindrical large-diameter portion, and capable of mounting a wire bundle on an inner peripheral portion of the cylindrical large-diameter portion and the cylindrical small-diameter portion, A grommet, characterized in that at least the bottom of the annular groove is formed in the same shape as the bent portion of the opening. 2. The grommet according to claim 1, wherein said large-diameter cylindrical portion has an elliptical shape.