JPH036116Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wire harness, and more specifically, to a water stop structure for preventing water from seeping between the wires of a wire bundle of a wire harness.

[Prior art] and [Problems to be solved by the invention] In general, wire harnesses installed in automobile bodies are wire harnesses installed at key points on the outer periphery in order to prevent water from entering the wire bundle and stabilize electrical performance. is being wrapped with tape. However, since gaps between the wires are unavoidable in wire bundles, moisture that enters through the gaps between the tape wrappings or areas where there is no tape wrapping causes capillary action and propagates through the gaps between the wires, causing water to gradually infiltrate. This is unavoidable, and there is a common drawback that sufficient waterproof performance cannot be obtained.

The purpose of the present invention is to solve the above-mentioned conventional difficulties, and to provide a wire harness in which water-stop portions are provided at important points in the wire bundle.

[Means for Solving the Problems] The present invention, which achieves the above objectives, is based on the following: ``A water stop part is installed at key points of the wire bundle of the wire harness with water stop pieces made of a hydrophilic material interposed between the wires. The water stopper piece has a structure in which water that is sequentially transmitted between the lines is absorbed by the water stop piece, and the water is allowed to drip to prevent the water from progressing.

[Example] and [Operation] The following is a detailed explanation using Examples. first,
Referring to FIG. 1 showing one embodiment, a water stopper is installed at a key point of the wire harness 1 (in this embodiment, a grommet 5 that extends and holds the wire harness 1 through the vehicle body mounting hole). A water stop portion 2 is provided, and a water stop piece 3 made of a hydrophilic material is attached to the water stop portion 2 with a water stop piece 3 interposed therebetween.

That is, the water stop part 2 causes the water stop piece 3 to absorb water that enters from the outer periphery of the water stop part 2 or from the front and back of the water stop part 2, and removes water saturated with water absorption by draining it from the water stop piece 3. It was provided with the intention of preventing further flooding, and the water stop piece 3 is, for example, Sanhuain QA (trade name) manufactured by Asahi Kasei Corporation.
etc., microporous membranes, microporous hollow fibers, or hydrophilic (affinity) materials obtained by sintering polyolefin, polyamide, polymethyl methacrylate, etc., and are formed into tangible bodies, and are interposed in contact between the wires. be.

Specifically, the water stop piece 3 of this embodiment is formed into a star shape with a large number of blades 4 arranged radially from the center, and the electric wire of the wire harness 1 is inserted between the blades 4 in sections to separate the blades 4. The surface of the wire is brought into contact with the surface of the wire so as to be interposed between the wires, and the tip of the blade 4 is mounted so as to protrude from the outer periphery of the bundle of wires. The water stop part 2 with the water stop piece 3 attached thereto is housed in the hollow part 6 of the grommet 5, and a drainage hole 7 is provided at the lower end of the hollow part 6.

Note that 8 in the figure indicates tape wrapping applied to the wire bundle before and after the water stop portion 2.

In the water stop section 2 having the above configuration, when water intrudes from the front and back of the water stop section 2 and sequentially propagates through the gaps between the lines, the water stop piece 3 interposed between the lines absorbs the water. When the amount of water absorbed reaches the saturation amount of the water stop piece 3, the water stop piece 3 acts as a drain and releases the water. Drainage is concentrated from hole 7. Therefore, water that passes through the gaps between the wires of the wire harness 1 is absorbed and discharged by the water stop section 2.
The water is concentrated and dispersed to the outside of the wire harness 1 and has the effect of effectively preventing water from entering the water stop portion 2 and beyond.

Next, another embodiment of the present invention will be described with reference to FIG. The water stop part 2 of this embodiment includes an inner fitting water stop piece 3A having a plurality of contact pieces 10 protruding from inside a cutout cylindrical main part 9, and a donut-shaped outer fitting externally fitting to the inner fitting water stop piece 3A. The water stop piece 3 is formed in combination with the water stop piece 3B, and both the water stop piece 3A and the water stop piece 3B are made of the hydrophilic material. be. Then, insert the electric wire of the wire harness 1 inside the inner water stopper piece 3A, bring the wire surface into contact with the contact piece 10, interpose the water stopper piece between the wires, and then insert the outer water stopper piece into the inner water stopper piece 3A. The water pieces 3B are combined and attached to the hollow part 6 of the grommet 5.

According to this embodiment, two separate pieces 3A, 3
Since the water stop piece 3 is made up of B, the amount of water absorbed by the water stop piece 3 is increased, and there is an advantage that the water absorption and drainage action described above becomes more active.

That is, the wire harness 1 of the present invention has a blade 4 or a contact piece 10 interposed between the wires of the wire harness, and an outer edge portion (tip portion of the blade 4, Alternatively, since the water stop part 2 is equipped with a "water stop piece 3" made of a hydrophilic material having a shape that has an outer peripheral part of the inner water stop piece 3A and an outer water stop piece 3B), water can leak between the wire harnesses 1. is blade 4・
Water is actively absorbed by the contact piece 10, and the absorbed moisture is dripped and drained from the outer edge of the water cutoff piece 3 to the outside of the wire bundle, effectively preventing water from seeping between the wire harnesses after the water cutoff portion 2. It has a special effect to prevent

In addition, in the configuration of the present invention described above, the water stop piece 3 does not necessarily have to be built into the hollow part 6 of the grommet 5, but the water stop part 2 is provided at a key point other than the grommet 5, and the water stop piece 3 is provided with a water drain that covers the water stop piece 3. A cover etc. may be attached.

[Effects of the invention] As described above, the wire harness of the present invention having the water stop portion 2 has the effect of effectively preventing water from progressing between the wires, and stabilizes the electrical performance of the wire harness. .

[Brief explanation of the drawing]

Figure 1: Shows the water stop part of the wire harness according to one embodiment of the present invention, (A) is a front view thereof, (B) is a perspective view showing the water stop piece, Figure 2: Another embodiment of the present invention FIG. 2 shows a water stop part of the example wire harness, with (A) being a front view thereof, and (B) being a perspective view showing a water stop piece thereof. Main symbols: 1...Wire harness, 2...Water stop part,
3... Water stop piece, 4... Blade, 5... Grommet, 6... Hollow part, 7... Drain hole, 9... Piece main part,
10...Contact piece.

Claims (1)

[Scope of utility model registration request] Water stop sections are provided at important points in the wiring harness.
The water stop part is made of "a water stop piece that is made of a hydrophilic material, has a blade or a contact piece interposed between the wires of the wire harness, and has an outer edge portion that protrudes from the outer periphery of the wire bundle." A wire harness characterized by comprising an attached structure.