JPH06217439A - Fixing method of grommet to wire harness - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for assembling a grommet to a wire harness, which allows easy insertion of the wire harness into the grommet and also provides sufficient sealing performance. [Structure] The grommet 2 has a thick large opening portion 5 in which a seal portion 3 which is an annular groove portion for fitting into a mounting hole formed in a vehicle body panel is formed, and a wire harness 4 is inserted and fitted. The small opening 6 for fitting is integrally formed via a flexible tubular member 9. The inner diameter of the small opening 6 is formed to be larger than the diameter of the wire harness 4 and smaller than the outer diameter of the rod-shaped member 1. The rod-shaped member 1 is sufficiently longer than the length of the tubular portion of the small opening 6 of the grommet 2, and has a slit formed over the entire length along the longitudinal direction and from the surface to the hollow portion. Further, a taper portion is formed at the front end in the insertion direction into the small opening 6.

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 (hereinafter, simply referred to as a grommet) used for inserting and assembling a wire harness into a hole formed in a panel of a vehicle or the like. Regarding the assembly method.

[0002]

2. Description of the Related Art As a conventional grommet used for inserting and assembling a wire harness into a mounting hole formed in a vehicle body panel, there is, for example, a structure as shown in FIGS. The grommet 12 is made of an elastic material such as synthetic rubber, and has a thick large opening 15 in which a seal portion 13 that is an annular groove for fitting into a mounting hole formed in a vehicle body panel 17 is formed, and a wire. The small opening 16 into which the harness 14 is fitted and inserted is integrally formed via a flexible tubular member 19. To attach the wire harness 14 to the grommet 12 having such a structure,
Before or after fitting the grommet 12 to the vehicle body panel 17, the wire harness 14 is inserted through the small opening, and then the tape is wound around the small opening 16 of the grommet 12 over the wire harness 14.

[0003] As another conventional example, the actual construction of Shokai 55-1
The grommet disclosed in Japanese Patent No. 53713 is shown in FIG. The grommet 22 is formed by integrally molding a large opening portion 23 having a seal portion 23a for fitting on a vehicle body panel 27 and a small opening portion 25 via a flexible portion 26, and a peripheral wall of the small opening portion 25. A notch opening 28 is formed in the axial direction from the tip of the above, and a floating piece 29 is provided. With this structure, the long small opening 25 allows a wire harness having a slightly different outer diameter to be inserted with a comparatively small expansion force, and after the insertion, the portion of the floating piece 29 is strongly wound with a tape, so that the grommet is attached to the grommet. It fixes the wire harness.

[0004]

However, in the former grommet 12, in order to secure the close contact between the wire harness 14 and the inner wall of the small opening 16, the inner diameter of the small opening 16 is smaller than the diameter of the wire harness. Needs to be small. Therefore, the frictional resistance at the time of inserting the wire harness becomes large, and it is necessary to expand the small opening 16 by using a special jig.
6 may be damaged. Moreover, after the insertion, it is necessary to wind a tape to fix the wire harness 14 to the grommet 12, and the workability is very poor. Further, in the latter grommet 22, since the small opening 25 is relatively long, it is necessary to perform expansion work with a special jig when inserting the wire harness, and it is also necessary to wind the tape around the floating piece 29 as described above. There is also. Therefore, the assembling work for fixing the wire harness 24 requires a long time, and there is a problem in work efficiency. The object of the present invention is made in view of the above-mentioned problems, and provides a method for assembling a grommet to a wire harness, which allows easy insertion of the wire harness into the grommet and yet has sufficient sealing property. Especially.

[0005]

The above object of the present invention is to fit a large-thickness opening having an annular groove for fitting into a mounting hole formed in a vehicle body panel and a wire harness. A method of assembling a grommet into a wire harness, in which a thin small opening for insertion is integrally formed via a flexible tubular member, in a wire harness having a diameter smaller than the inner diameter of the small opening. A rod-shaped member having an outer diameter larger than the inner diameters of the hollow portion and the small opening for externally inserting the wire harness at a predetermined position and having a taper portion formed at the front end in the insertion direction is externally inserted to the wire harness, and then the rod-shaped member This can be achieved by a method of assembling a grommet to a wire harness, characterized in that a member is press-fitted into the small opening. Further, the above-mentioned object is that the rod-shaped member is formed with a slit having a depth extending from the surface to the hollow portion along the entire length in the longitudinal direction, and the adhesive is filled from the slit after the wire harness is assembled. It can be reliably achieved by fixing it to the wire harness.

[0006]

As described above, in the present invention, the wire harness having the diameter smaller than the inner diameter of the small opening of the grommet has the outer diameter larger than the inner diameter of the small opening of the grommet and the tapered portion is formed at the front end. The rod member is externally inserted, and the rod member is closely fitted to the inner wall of the small opening while the wire harness is inserted into the small opening of the grommet, whereby the grommet is attached to the wire harness very easily. Moreover, the close contact can ensure a sufficient sealing property with respect to the grommet of the wire harness.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. However, it goes without saying that the present invention is not limited to the following examples. FIG. 1 is a perspective view showing an assembled state of a grommet to a wire harness which is an embodiment of the present invention, FIG. 2 is a perspective view of a rod-shaped member according to the present invention, and FIG. FIG. 4 is a cross-sectional view showing the state of FIG. 4, and FIG. 4 is a cross-sectional view showing the state where the grommet is assembled to the wire harness.

As shown in FIG. 1, the grommet 2 has a large-thickness opening 5 in which a seal portion 3 which is an annular groove for fitting into a mounting hole formed in a vehicle body panel is formed, and a wire harness. A small opening 6 for inserting and fitting 4 is formed integrally with a flexible tubular member 9. The inner diameter of the small opening 6 is formed to be larger than the diameter of the wire harness 4 and smaller than the outer diameter of the rod-shaped member 1. As shown in FIG. 2, the rod-shaped member 1 is a slit having a length sufficiently longer than the length of the tubular portion of the small opening 6 of the grommet 2 and extending along the longitudinal direction along the entire length and from the surface to the hollow portion 8. 11 is formed. Further, a taper portion 10 is formed at the front end in the insertion direction into the small opening 6.

Next, the assembly of the wire harness 4 to the grommet 2 will be described. To fix the wire harness 4 to the grommet 2 as shown in FIG.
The slit 11 is opened to fit the wire harness 4 into the hollow portion 8 or the end portion of the wire harness 4 is inserted into the hollow portion 8 of the rod-shaped member 1. Next, when the adhesive is filled from the slit 11, the adhesive also wraps around the inner wall 8a of the hollow portion 8 and the wire harness 4 and the rod-shaped member 1 are firmly fixed by the curing of the adhesive. The bonding work is performed outside the large opening 5 of the grommet 2.

Then, as shown in FIG. 4, when the adhesive hardens, the wire harness 4 is pulled toward the small opening 6 of the grommet 2 and is pushed into the small opening 6 from the tapered portion 10 of the rod-shaped member 1 first. Therefore, the rod-shaped member 1 is relatively easily fitted while expanding the small opening 6, and the wire harness 4 is fitted to the grommet 2. Further, since the wire harness 4 is in close contact with the small opening 6, it prevents the ingress of water or the like from the outside. It is also possible to first fit the grommet 2 to the vehicle body panel 7 and then insert the wire harness 4 to fit them. Furthermore, by using rod-shaped members having different outer diameters, it is possible to adapt to various grommets, so that it is excellent in versatility.

[0011]

As described above, according to the present invention, by fixing the rod-shaped member at a desired position of the wire harness, the grommet can be easily inserted into the wire harness and good sealing performance can be maintained. , Workability can be greatly improved. Further, the wire harness can be assembled while the grommet is fitted to the vehicle body panel in advance.
Furthermore, since bar-shaped members having different outer diameters can be applied to various grommets, they are excellent in versatility.

[Brief description of drawings]

FIG. 1 is a perspective view showing an assembled state of a grommet in a wire harness according to the present invention.

FIG. 2 is a perspective view of a rod-shaped member according to the present invention.

FIG. 3 is a cross-sectional view showing a state before the grommet is attached to the wire harness.

FIG. 4 is a cross-sectional view showing a state in which the grommet is completely attached to the wire harness.

FIG. 5 is a perspective view showing an assembled state of a conventional grommet to a wire harness.

FIG. 6 is a cross-sectional view showing an assembled state of a conventional grommet to a wire harness.

FIG. 7 is a cross-sectional view showing a state in which another conventional grommet is attached to a wire harness.

[Explanation of symbols]

 1 bar-shaped member 2 grommet 3 seal part 4 wire harness 5 large opening part 6 small opening part 7 vehicle body panel 8 hollow part 9 tubular member 10 taper part 11 slit

Claims (2)

[Claims] 1. A large thick opening having an annular groove for fitting into a mounting hole formed in a vehicle body panel, and a small small opening for fitting a wire harness. A method of assembling a grommet integrally formed with a flexible tubular member into a wire harness, wherein the grommet is externally inserted into the wire harness at a predetermined position of the wire harness having a diameter smaller than the inner diameter of the small opening. A rod-shaped member having an outer diameter larger than the inner diameters of the hollow portion and the small opening and having a tapered portion formed at the front end in the insertion direction is externally inserted into the wire harness, and then the rod-shaped member is press-fitted into the small opening. A method for assembling a grommet to a wire harness. 2. The rod-shaped member has slits formed along the longitudinal direction over the entire length and from the surface to the hollow portion, and after the wire harness is assembled, an adhesive is filled from the slits. The method of assembling a grommet to a wire harness according to claim 1, wherein the grommet is fixed to the wire harness.