JPH0436193Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to the case where a bundle of wire harnesses is inserted into a grommet and a filler is injected into the wire harness insertion part of the grommet to make the grommet waterproof. The present invention relates to a waterproof structure of a grommet capable of completely sealing a gap formed inside a bundle of wire harnesses by sufficiently permeating a filling material therein.

[Conventional technology and problems]

When a bundle of wire harnesses is inserted into a grommet, gaps are created between the grommet and the wire harnesses, and between the wire harnesses. Conventionally, a liquid hardening filler is poured into these gaps to seal them and make the grommet waterproof. As a technique, for example, there is a technique described in Japanese Utility Model Application Publication No. 59-152785.

That is, in FIG. 7, the grommet A has an enlarged diameter portion 1 that serves as a loose insertion hole for the wire harness 3.
and a diameter-reducing hole 2 that serves as a tightening hole for the wire harness 3.
are connected in series to form a wire harness insertion hole, and after inserting the wire harness 3 into the wire harness insertion hole, the groove-shaped engaging portion 4 provided around the outer periphery of the grommet A is inserted. There is a technique in which the expanded diameter portion 1 is filled with a liquid hardening filler 7 after being fitted and locked into the annular protrusion 6 of the wall 5 .

The filler 7 fills the gap created between the diameter-reduced hole 2 and the wire harness 3 and the plurality of wire harnesses 3.
It must be able to seep into the gaps that occur between them and seal even the smallest gaps.

For this purpose, the filler 7 injected into the enlarged diameter part 1 is
is extremely fluid and highly permeable, and as shown in FIG. It must be sufficiently permeable to the center.

However, the gap between the wire harnesses 3 that are tightened in the diameter reducing hole 2 and wrapped with tape on the outside of the grommet and crowded together is narrow, and for example, adjacent wire harnesses 3a and 3b may come into contact and close the gap. If the filler material 7 is present, entry of the filler material 7 is likely to be blocked.

Furthermore, the filler gradually hardens over time and its permeability deteriorates, so there is a risk of incomplete sealing.

In particular, if the number of wire harnesses 3 is large and the outer diameter of the bundle of wire harnesses 3 (the diameter indicated by the dashed line)
is large, it is difficult to completely seal the gap all the way to the center of the bundle.

The present invention has been developed in view of this problem, and provides a waterproof grommet structure in which the gap in the wire harness bundle is completely filled with a filler material.

[Means for solving problems]

The present invention involves inserting a wire harness into the hole of a grommet, which has an engaging portion on the outer periphery that fits into a panel, etc., and a hole for inserting the wire harness inside, and then injecting a liquid hardening filler. In the waterproof structure of the grommet that waterproofs the gap formed between the wire harness insertion hole and the wire harness, a plurality of legs bent into an annular portion are provided inside the wire harness inserted into the grommet. By inserting the provided spacer, a space is formed inside the distorted wire harness, and the hole is sealed with a liquid hardening filler injected into the outer periphery of the wire harness and into the space. At the same time, the spacer has a structure in which the tip of the leg is fixed.

[Effect]

The bundle of wire harnesses inserted into the grommet is densely packed, and if the filling material is only introduced from the outside of the bundle of wire harnesses, it is difficult to penetrate into the gaps inside the bundle. When a filler is injected into the wire harness, the filler flows into the bundle from the inside and outside, so that the filler permeates throughout the bundle of wire harnesses. In addition, the spacer fixed to the tip of the leg is elastically deformed substantially uniformly in response to external tension applied to the wire harness, so it serves to relieve the external tension.

〔Example〕

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

Note that the same parts as in the conventional example are given the same reference numerals.

In FIG. 1, a bundle of wire harnesses 3 inserted into a grommet A is tightened by a tube 8 having a diameter-reducing hole 2, and a tape 9 is further wound around the outside of the grommet to bring it into a tight state. There is.

When a round bar-shaped spacer 10 is inserted into the approximate center of the bundle of wire harnesses 3, the bundle of wire harnesses 3 is distorted and divided into two parts, and a space 1 is formed inside the bundle of wire harnesses 3 that is connected to the outside.
1 is formed.

As shown in FIG. 2, the shape of the space 11 is a vertically elongated shape that extends up to the diameter reduction hole 2 due to the rigidity of the wire harness 3.

Next, when the liquid hardening filler 7 is injected into the inside of the grommet A, the filler 7 flows from the outside of the bundle of wire harnesses 3 and the space 11 into the gap existing in the bundle, and the diameter-reducing hole 2 As shown in FIG. 3, the inside of the tube 8 having the bundle is filled without any gaps with the filling material 7 that permeates from the inside and outside of the bundle.

Further improved waterproof structures shown in FIG. 3 are shown in FIGS. 4 to 6. In this waterproof structure, a resin spacer 12 having a plurality of bent legs 12b erected on a flexible annular portion 12a is inserted into a bundle of wire harnesses 3, and the bundle is expanded substantially uniformly in the outer circumferential direction. It is something to be released.

In this case as well, the space 13 created inside has a vertically elongated shape that extends up to the diameter reducing hole 2 .

Since the bundle bulges out substantially uniformly in the outer circumferential direction, the filling material permeates into the inside of the bundle almost uniformly, and there is an advantage that no incomplete permeation occurs in any part.

In addition, the bundle of wire harnesses 3 is elastically deformed almost uniformly by the flexible spacers 12 fixed to the solidified filler 7 at the ends of the legs 12b, thereby alleviating the external tension applied to the wire harnesses 3. The wall body 5 has the function of
It has a function to prevent accidents where it comes off.

〔effect〕

There are many small gaps between the wire harnesses inserted into the grommets, and when creating a waterproof structure by sealing these gaps with a liquid hardening filler injected into the grommets, conventional wire harness There was a problem that the filling material did not penetrate sufficiently into the inside of the bundle, but in the present invention, a spacer is inserted into the bundle of wire harnesses that are inserted into the grommet and crowded together to form a space inside the bundle. By having a structure filled with filler, the filler permeates through the bundle without any gaps, resulting in a water-resistant structure. Further, spacers fixed to the tips of the plurality of legs have the effect of relieving external tension.

Moreover, since no complicated equipment or tools are required to form this structure, a reliable water-resistant structure can be obtained extremely easily.

[Brief explanation of drawings]

Figures 1 to 6 show embodiments of the present invention;
The figure is a perspective view of a grommet with a spacer inserted into a bundle of wire harnesses, Figure 2 is a vertical sectional view of the same as above, Figure 3 is a sectional view along AA of Figure 2, and Figure 4 is a perspective view of a grommet with a spacer inserted into a bundle of wire harnesses. FIG. 5 is a vertical cross-sectional view of the same as above, FIG. 6 is a perspective view of a spacer in the same embodiment, FIG. 7 is a vertical cross-sectional view of a conventional grommet, and FIG. The figure is a sectional view of a main part of a bundle of wire harnesses.

Claims (1)

[Scope of utility model registration request] After inserting the wire harness into the hole of the grommet, which has an engaging portion on the outer periphery that fits into a panel, etc. and a hole for inserting the wire harness inside, a liquid hardening filler is injected, and the wire harness is inserted. In the waterproof structure of the grommet that waterproofs the space between the hole and the wire harness, a spacer having a plurality of legs in an annular portion is inserted inside the wire harness inserted into the grommet. As a result, a space is formed inside the wire harness where the distortion occurs, and the hole is sealed by a liquid hardening filler injected into the outer periphery of the wire harness and into the space, and the legs of the spacer are sealed. A waterproof grommet structure characterized by a structure in which the tip of the grommet is fixed.