JPH0448098Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a grommet that seals and supports multiple wire harnesses inserted into holes drilled in a wall such as a machine frame or a panel of equipment. It is related to waterproof structure.

[Conventional technology and problems]

As a conventional technique for a grommet that seals and supports a plurality of wire harnesses inserted into holes provided in a wall, there is, for example, a technique described in Japanese Utility Model Application Publication No. 152785/1985.

That is, in FIG. 3, grommet A is provided with a wire insertion hole consisting of an enlarged diameter hole 1 and a reduced diameter hole 2 connected to the enlarged diameter hole 1, and the wire harness 3 is passed through this wire insertion hole. At the same time, after filling the enlarged diameter portion 1 with the liquid hardening filler 7 without any gaps, the groove-shaped engaging portion 4 provided around the outer periphery of the grommet A is fitted into the annular protrusion 6 of the wall body 5. There is a technology to lock and match.

When filled, the filler 7 is a highly permeable liquid that completely seals the gap between the diameter-reduced hole 2 and the wire harness 3 and the gap between the electric wires of the wire harness 3, and saves time. It must solidify over time while maintaining a sealed state.

However, the properties of liquid curable fillers have the following problems.

(a) Fillers with long curing times have excellent permeability, but the long curing time reduces the productivity of filling operations.

(b) Using a filler with a short curing time increases the productivity of the filling operation, but it has the disadvantage of poor permeability and lack of waterproof function.

As mentioned above, the fluidity (permeability) and early hardening properties (productivity) required of liquid hardening fillers have contradictory properties, and there is no filler that satisfies both properties. Nakatsuta.

The present invention was developed by focusing on the above-mentioned conventional problems, and it completely seals the gaps that occur between the multiple electric wire insertion sections to ensure waterproofing, and also protects the opening of the grommet into which the filler is injected. The present invention provides a highly productive filler that can be cured in a short time.

[Means for solving problems]

The present invention has a wire insertion hole in the center of a grommet that has an engaging part that fits into a hole in a panel, etc. on the outer periphery, and is made up of an enlarged diameter hole and a reduced diameter hole connected to the enlarged diameter hole. In the waterproof structure of the grommet, the liquid curable filler is injected into the enlarged diameter hole to seal the gap in the wire insertion hole after the wire harness is inserted into the wire insertion hole. It is composed of two layers: a liquid curable filler with excellent permeability that is injected first, and a liquid curable filler of the same material that takes a short curing time and is injected later.

[Effect]

When a filler with a long hardening time is injected into the enlarged diameter hole of the wire insertion hole, the filler has excellent fluidity and permeability, so it spreads to minute gaps and reliably seals the gaps.

Next, when a filler with a short curing time is poured over it, the filler solidifies in a short time and firmly grips the grommet and wire harness, thereby shortening the filling operation time.

〔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 Figure 1, in the center of grommet B,
An electric wire insertion hole is composed of an enlarged diameter hole 1 having an opening 8 on one side, and a reduced diameter hole 2 that forms the inner surface of a protruding cylindrical tube 9 on the other side and is connected to the enlarged diameter hole 1. provided.

The enlarged diameter section 1 has a sufficient gap for the plural wire harnesses 3 to be inserted, but the reduced diameter section 2 has a diameter that is approximately equal to or smaller than the total diameter of the plurality of wire harnesses 3.

The outer circumference of the grommet B has an annular groove 4 that fits into a hole in the wall 5.

After inserting a plurality of wire harnesses 3 into the grommet B, a liquid curable filler 10 having a long curing time is injected through the opening 8.

Since the filler 10 has excellent fluidity and permeability, it fills all the gaps between the tube 9 and the wire harness 3 and the gaps between the plurality of wire harnesses 3, as shown in FIG.

Next, liquid curable filler 11 with short curing time
When injected through the opening 8, the filler 11 becomes the filler 1.
The top of 0 is sealed to form a two-layer structure.

Note that the two types of fillers 10 and 11 are made of the same material, and the reaction time differs depending on the amount of catalyst added, so the fillers 10 and 11 are integrally bonded without creating a boundary surface. do.

First, the filler 11 solidifies in a short time,
Firmly grasp grommet B and wire harness.

On the other hand, the solidification time of the filler 10 that has spread to minute gaps and reliably sealed them is delayed, but grommet B and wire harness 3 are both supported by the solidified filler 10, so deformation will not occur. Instead, the filler 10 gradually solidifies while being protected by the filler 11.

Therefore, the filling operation is completed when the filler 11 solidifies, without waiting for the filler 10 to completely solidify.

〔effect〕

The present invention uses a liquid curable filler, and injects the liquid curable filler with a short curing time onto the liquid curable filler with a long curing time, and hardens the surface side first. It has become possible to simultaneously satisfy the contradictory properties of permeability and productivity required for.

Therefore, it has become possible to manufacture waterproof grommets with high productivity.

In addition, since the highly permeable filler solidifies while being protected by the quickly solidifying filler, it has the advantage of high reliability in waterproofing.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention, Figure 1 is a longitudinal sectional view of the grommet after filling the filling material, Figure 2 is the AA sectional view of the same, and Figure 3 is the conventional filling of the grommet. FIG. 3 is a longitudinal cross-sectional view after material injection. A, B... Grommet, 1... Enlarged hole, 2... Diameter reduced hole, 3... Wire harness, 4... Engaging part,
5... Wall, 8... Opening, 9... Tube, 1
0,11...Filling material.

Claims (1)

[Scope of utility model registration request] A wire insertion hole consisting of an enlarged diameter hole and a reduced diameter hole connected to the enlarged diameter hole is provided in the center of the grommet, which has an engaging portion that fits into a hole in a panel, etc. on the outer periphery, and the wire is inserted into the grommet. In the waterproof structure of a grommet, in which a liquid hardening filler is injected into the enlarged diameter hole to seal the gap in the wire insertion hole after the wire harness is inserted into the insertion hole, the liquid hardenable filler is first injected. liquid hardening filler with excellent permeability,
A waterproof structure of a grommet characterized by having a two-layer structure with a liquid hardening filler made of the same material that is injected later and having a short hardening time.