JPH08185745A - Grommet for wire harness - Google Patents

Abstract

PURPOSE: To provide a sufficient sealing property between a grommet main body and a vehicle body panel. CONSTITUTION: A grommet main body 12 and an inner member 13 are integrated. The grommet main body 12 is constituted of a barrel section and a flange section 14, and an outer periphery side circular press section 17 and an inner periphery side circular press section 18 are formed on the flange section 14. The outer periphery of the flange section 14 is made thick, and the circular end face of the flange section 14 is extended obliquely outward to form the outer periphery side circular press section 17. The portion extended inward to hold the inner member 13 is extended obliquely outward to form the inner periphery side circular press section 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire harness grommet which is used when a wire harness is inserted into a panel of an automobile or the like and is composed of a rubber main body and a resin inner member.

[0002]

2. Description of the Related Art Conventionally, some wire harness grommets include, for example, a rubber grommet body 1 and a resin inner member 2 as shown in FIG. 62131).

The grommet body 1 comprises a flange portion 3 and a body portion 4, and an annular pressure contact portion 5 is formed on the peripheral edge of the flange portion 3. Ribs 6 are provided at a plurality of locations on the annular pressure contact portion 5, and when the grommet is attached to the vehicle body panel 7,
The annular press contact portion 5 is prevented from bending inward.

On the other hand, the inner member 2 is the grommet body 1
It is embraced and integrated with the flange portion 3, and a locking portion 8 is formed on the outer peripheral surface.

In the grommet having the above-mentioned structure, the annular pressure contact portion 5 is pressed against the vehicle body panel 7 in a state where the locking portion 8 of the inner member 2 is locked in the insertion hole 7a formed in the vehicle body panel 7. In addition to obtaining the locked state, the annular pressure contact portion 5 is brought into close contact with the vehicle body panel 7 to obtain a predetermined waterproof property.

[0006]

However, in the above-mentioned conventional grommet, since the rib 6 is provided,
Although the bending rigidity of the annular pressure contact portion 5 is increased, the amount of elastic deformation is suppressed, so that when a bending force is applied to the inserted wire harness 9, a gap is generated between the annular pressure contact portion 5 and the vehicle body panel 7, and the desired waterproofness is obtained. May not be obtained.

Therefore, in view of the above problems, it is an object of the present invention to provide a grommet capable of obtaining a sufficient sealing property between the grommet body and the vehicle body panel.

[0008]

In order to achieve the above object, the present invention provides a rubber grommet main body including a flange portion and a body portion, and a resin grommet that is held on the inner circumference of the flange portion of the grommet main body. Consisting of the inner member of, and in a state where the locking portion of the inner member is locked to the inner edge of the insertion hole formed in the vehicle body panel, by pressing the annular pressure contact portion formed in the flange portion of the grommet body to the vehicle body panel, In a grommet for a wire harness designed to obtain desired waterproofness, the outer peripheral surface of the flange portion is made thick, and the outer peripheral side annular pressure contact portion is formed by extending obliquely outward from the annular end surface of the flange portion. And an inner peripheral side annular pressure contact portion formed by extending obliquely outward from a portion extending inwardly for holding the inner member, thereby forming the annular pressure contact portion. Than it is.

[0009]

According to the present invention, when the engaging portion of the inner member is engaged with the insertion hole of the vehicle body panel, both annular pressure contact portions are brought into pressure contact with the vehicle body panel, and a desired sealing state is obtained. Here, when a bending force is applied to the wire harness, the body portion of the grommet body is elastically deformed, but since the outer peripheral side annular pressure contact portion is formed thick, a sufficient pressure contact force is maintained against the vehicle body panel. .

[0010]

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

FIG. 1 is a sectional view showing a state in which a wire harness 10 is inserted into a grommet according to the present invention and mounted in an insertion hole 11a of a vehicle body panel 11. This grommet is
As in the prior art, it is composed of a rubber grommet body 12 and a resin inner member 13.

The grommet body 12 comprises a flange portion 14 and a body portion 15. Since the peripheral edge of the flange portion 14 is formed in an annular shape having a substantially U-shaped cross section, the inner member 13
Is an inner member holding portion 16 for holding. Further, an outer peripheral side annular pressure contact portion 17 and an inner peripheral side annular pressure contact portion 18 are provided on the flange portion 14 so as to project obliquely outward. As shown in FIG. 3, the outer peripheral side annular pressure contact portion 17 is not on the outer surface end portion 14 a of the flange portion 14 but on the outer surface base portion 1.
By being formed from 4b, it has a thick wall that bulges from the outer peripheral surface of the flange portion 14. As a result, the elastic force of the outer peripheral side annular pressure contact portion 17 is enhanced, and a desired pressure contact force can be obtained when the outer peripheral side annular pressure contact portion 17 is mounted in the insertion hole 11a of the vehicle body panel 11. On the other hand, as shown in FIG. 4, the inner peripheral side annular pressure contact portion 18 has the outer peripheral side annular pressure contact portion 17 even if it is elastically deformed.
The elastic force is smaller than that of the outer peripheral side annular pressure contact portion 17, and is formed so as to be smaller than that of the outer peripheral side annular pressure contact portion 17.

A bellows-shaped bent portion 19 is formed in the body portion 15 within a predetermined dimension from the flange portion 14. The bent portion 19 gives flexibility to the body portion 15 and can follow the movement of the inserted wire harness 10. Further, the tip portion of the body portion 15 is inserted into the outer peripheral portion of the wire harness 10 in a close contact state,
A desired waterproof property can be obtained by filling a resin between the electric wires constituting the.

The inner member 13 has an insertion hole 13a at the center thereof.
Is formed into a disk shape, and is held and integrated with an inner member holding portion 16 formed on the flange portion 14 of the grommet body 12. On the end surface of the inner member 13, locking pieces 20 are provided at four locations in the circumferential direction so as to be equally divided. At the tip of the locking piece 20, the locking claw 2 protruding outward is provided.
0a is formed, and the outer surface thereof is gradually inclined inwardly toward the tip.

The locking piece 20 is inserted through the locking claw 2
The insertion hole 11a of the vehicle body panel 11 to which 0a is locked is a locking receiving portion 21 that projects cylindrically in the direction in which the locking piece 20 is inserted (the side opposite to the position where the grommet is mounted).
have.

In the grommet having the above structure, the inner member 13 is integrated with the grommet body 12,
The wire harness 10 is inserted through both the insertion holes 12a and 13a, and is attached to the insertion hole 11a of the vehicle body panel 11.

That is, when the locking piece 20 is inserted into the insertion hole 11a formed in the vehicle body panel 11, the locking claw 20 is inserted.
The inclined surface of a contacts the edge of the insertion hole 11a,
Elastically deforms inward. Then, the locking claw 20 a is elastically restored to the original shape after passing over the locking receiving portion 21, and is locked to the locking receiving portion 21. In this state, the outer peripheral side annular pressure contact portion 17 and the inner peripheral side annular pressure contact portion 18 formed on the grommet body 12 are in pressure contact with the vehicle body panel 11.

By the way, the pressure contact force of the outer peripheral side annular pressure contact portion 17 to the vehicle body panel 11 is reinforced by the outer peripheral side annular pressure contact portion 17 being formed so as to have a large thickness outward. Therefore, the locked state between the locking claw 20a and the insertion hole 11a becomes strong. As a result, even if the body part of the grommet is elastically deformed by the bending force acting on the wire harness 10, the pressure contact force between the outer peripheral side annular pressure contact part 17a and the vehicle body panel 11 becomes a predetermined value or more, so that both There will be no problems such as a gap being formed between them and the desired waterproofness being not obtained. In addition, the pressure contact force of the inner peripheral side annular pressure contact portion 18 to the vehicle body panel 11 is set to be smaller than that of the outer peripheral side annular pressure contact portion 17, and the outer peripheral side annular pressure contact portion 17 plays an auxiliary role on the waterproof surface.

As described above, according to the grommet according to the present embodiment, the outer peripheral side annular pressure contact portion 17 is formed thicker toward the outside, so that the pressure contact force is maintained while maintaining a predetermined deformation amount. Since it is reinforced, the state where the locking claw 20a is locked to the locking receiving portion 21 of the insertion hole 11a of the vehicle body panel 11 can be firmly maintained. Therefore, even if the bending force acts on the wire harness and the body portion 15 of the grommet is elastically deformed, the minimum necessary pressure contact force is applied to the portion where the outer peripheral side annular pressure contact portion 17 and the vehicle body panel 11 have the lowest pressure contact force. Can be secured. As a result, desired waterproofness can be obtained, and it is possible to reliably prevent water from entering.

[0020]

As is apparent from the above description, according to the present invention, the outer peripheral side annular pressure contact portion and the outer peripheral side annular pressure contact portion are formed on the flange portion of the grommet body, and the outer peripheral side annular pressure contact portion is formed. Since it is thickened to bulge from the outer peripheral surface of the flange portion, even if the bending force acts on the wire harness and the grommet is deformed, at least the necessary pressure contact force can be obtained by the annular pressure contact portion. It is possible to maintain waterproofness.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a grommet according to this embodiment is attached to a vehicle body panel.

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

FIG. 3 is a partially enlarged cross-sectional view showing an annular pressure contact portion of the grommet of FIG.

FIG. 4 is a partially enlarged sectional view of FIG.

FIG. 5 is a front view of a grommet according to a conventional example.

[Explanation of symbols]

 12 Grommet body 13 Inner member 14 Flange portion 17 Outer peripheral side annular pressure contact portion 18 Inner peripheral side annular pressure contact portion

Claims (1)

[Claims] 1. A rubber grommet main body including a flange portion and a body portion, and a resin inner member held on the inner circumference of the flange portion of the grommet main body. In a state in which it is locked to the inner edge of the insertion hole formed in the panel, by pressing the annular pressure contact portion formed in the flange portion of the grommet body to the vehicle body panel, in the wire harness grommet to obtain the desired waterproofness, The outer peripheral surface of the flange portion has a large thickness, and the outer peripheral side annular pressure contact portion formed by extending obliquely outward from the annular end surface of the flange portion and the inner peripheral member extending inward to hold the inner member. A grommet for a wire harness, characterized in that the annular press-contact portion is formed of an inner peripheral side annular press-contact portion formed by extending obliquely outward from the provided portion.