JPH10172360A - Wire harness waterproofing method and water stopping agent ejector for use therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a grommet to be waterproofed on the assembly line of wire harness. SOLUTION: When wires W are laid during the assembly of wire harness, those wires which are to be waterproofed are arranged adjacent to one another and in a line, and water stopping agent discharging elements 21c, 21d from which numerous nozzles 21g are projected are opposed to each other on both sides of the wires W. The numerous nozzles 21g are inserted into the gaps among the wires, a water stopping agent having the required viscosity is ejected from the nozzles 21g in such a way as to be infused among the wires, the parts to which the water stopping agent was applied are covered with film and rolled into a circular cross section, the outer periphery of the film is wrapped with tape, and the wires are passed through a grommet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for waterproofing a wire harness for waterproofing between wires of a wire harness inserted into a grommet for installation in a through-hole for a vehicle, and a water-stopping material discharger used therefor. It is about.

[0002]

2. Description of the Related Art In a wiring harness for an automobile, when a wiring harness is wired through a panel or the like that separates an engine room and a cabin of the automobile, a rubber grommet is attached to a through hole formed in the panel, and the grommet is mounted. The wiring harness is routed through to prevent water from entering the cabin.

The grommet has a panel engaging portion provided on an outer peripheral surface of an enlarged portion having a substantially conical cylindrical shape, and the panel engaging portion is engaged with an inner peripheral edge of the panel through-hole. The gap is securely sealed for waterproofing, and the wire harness is passed through the grommet to the reduced diameter tube portion extending to the reduced end side of the enlarged diameter portion.

[0004] If there are gaps between the electric wires of the wire harness through which the grommet is inserted and between the electric wires and the grommet tube, water is generated in the vehicle interior from the engine room side through the gaps. Need to be sealed.

As the waterproof structure between lines, as shown in FIG.
Is provided to infiltrate each gap of the electric wire w. Alternatively, using an elastic cap provided with a plurality of holes through which each wire of the wire harness is inserted one by one, fitting the elastic cap into the grommet tube while the wires are passed through the holes of the elastic cap, From the inside to the inside of the elastic cap. (Japanese Utility Model Application Laid-Open No. 1-66713, Japanese Utility Model Application Laid-Open No. 2-1)
No. 15221, Japanese Utility Model Laid-Open No. 4-23812)

[0006]

In the case of the former waterproof structure shown in FIG. 5, unless the fluid sealing material has a low viscosity (for example, 100 poise or less), it hardly penetrates into the gaps between the electric wires, and conversely has a low viscosity. In this case, complete waterproofing cannot be expected because there is a possibility that the water will flow out of each gap until the resin is cured. Therefore, in general, a grommet 1 is used at a predetermined position of the wire harness W / H as shown in FIG.
After filling, the grommet 1 is filled with a two-component urethane or the like while being mixed, and is dried and cured after filling.

However, it is troublesome to use a mixture of two liquids such as two-part urethane, and the liquids mixed at one time are easily cured in the air.
Very difficult to handle. In addition, there is a problem that the equipment for mixing the two liquids is large-sized and cannot be operated on a wire harness assembly line, and a separate process must be provided to fill the sealing material.

On the other hand, in the latter waterproof structure, since a gap is reliably formed between the electric wires, even if the fluid sealing material has a high viscosity, it can easily penetrate into the gap between the electric wires to achieve perfect waterproofing. In addition, a separate elastic cap is required, and the number of steps for inserting each electric wire through the cap and the step of fitting the cap to the grommet are increased. In addition, there is a problem that the diameter of the enlarged portion of the grommet is increased by an amount corresponding to the gap between the electric wires, and the grommet is enlarged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the process is relatively simple and the cost is small.
An object of the present invention is to provide a waterproofing method for a wire harness that can be completely waterproofed, and a waterproofing agent discharger used for the method.

[0010]

In order to solve the above-mentioned problems, according to the present invention, there is provided a wire harness for waterproofing between wires of a wire harness which is inserted into a mounting grommet into a panel through hole. When laying the wire group at the time of assembling the wire harness, the wire groups at the locations where the waterproofing is to be performed between the wires are arranged side by side in a row, and a number of nozzles project from both sides of the side-by-side wire group. Attached water-stopping agent discharge bodies are provided, and a number of nozzles are inserted into gaps between wires to discharge a water-stopping agent having a required viscosity from the nozzles so as to penetrate between wires. A method for providing a waterproofing method for a wire harness, comprising: covering a portion of the film to which the water-stopping agent has been applied with a film, rolling the film into a circular cross section, winding the outer periphery of the film with a tape, and passing the film through the grommet. I have.

As described above, when the electric wires are laid on the wire harness assembly line, the electric wires are aligned in a line, and a large number of the water-blocking agent discharge bodies are arranged to be sandwiched from both sides with respect to the electric wire group in this state. A gap can be formed between the electric wires by the nozzle. Then, by discharging a water-stopping agent having a required viscosity from a large number of nozzles, the water-stopping agent can also penetrate into the gap between the wires, so that the water-stopping agent can be reliably applied to the surface of the wires and between the wires. Can be applied. After that, when a film is put on these wire groups and taken out, the wires are taken out without attaching the waterproofing agent to the hands of the workers, and the wire groups that are arranged in a line from the film on the surface side are rounded into a circular cross section. Can be easily done. After that, if the tape is wound in order to hold in this state, it is possible to maintain the shape of the portion filled with the water-stopping agent and to prevent the flow and diffusion of the water-stopping agent. In this state, if the grommet is passed in close contact with the inside (reduced diameter portion) of the grommet, reliable waterproofing can be easily provided.

Further, according to the present invention, there is provided a pair of waterproofing agent discharge bodies having a flat holding surface opposed to both side surfaces of a group of electric wires arranged in parallel. A water-stopping agent storage chamber to which a water-stopping agent is supplied is provided inside, and a number of nozzles inserted into the gaps of the electric wire group are provided on the holding surface so as to communicate with the water-stopping agent storage chamber. In addition, the present invention provides a water-stopping agent discharging machine characterized in that both opposing water-stopping agent discharging bodies are connected so as to be openable and closable.

[0013] According to the above structure, the two side surfaces of the electric wire group arranged in a line are sandwiched between the pair of waterproofing agent discharge bodies, so that a large number of nozzles protruding from the holding surface of the waterproofing agent discharge body are forced. The wire group can be inserted between the wires in an unraveled state, and a gap can be formed between the wires. In such a state, by discharging the water-stopping agent from a large number of nozzles, the water-stopping agent is effectively filled in the gaps between the wires, and the surfaces of the wires and between the wires can be reliably treated with the water-stopping agent. .

[0014] The nozzles projecting from the pair of water-stopping agent discharge bodies are arranged to face each other with their positions shifted from each other.

[0015] Thus, a large number of nozzles are inserted into the electric wire group without interfering with each other, and the action of loosening the electric wire group and filling the gap with the waterproofing agent can be more effectively performed.

[0016]

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

FIGS. 1 and 2 show a waterproof jig 11 and a waterproofing agent discharger 21 installed on a wiring board 10 for assembling a wire harness. The waterproofing jig 11 includes a support shaft 12 which is detachably mounted on the wiring board 10, a substrate 13 fixed to the upper end of the support shaft 12, and a pair of protrusions protruding from the substrate 13 at a required interval. Wire holding members 14 and 15 are provided.

The support shaft 12 is supported so as to be able to move up and down through a mounting hole 10 a formed in the wiring board 10, and is capable of engaging and disengaging a locking means 16 for temporarily fixing the substrate 13 at a predetermined height with respect to the support shaft 12. Provided, the substrate 1 is released by releasing the locking means 16.
3 can be lowered to the upper surface of the wiring board 10. The pair of wire holding members 14 and 15 are fixed to the upper surface of the substrate 13, and the wire w is inserted from the upper end openings 14b and 15b, and the inserted wire w is arranged in a line. , 15a, and both ends 14c, 15c of the upper end openings of the wire insertion slots 14a, 15a have their tips inclined in the opening direction.

The water-stopping agent discharger 21 is formed by a pair of electric wire holding members 14 and 15 by the electric wire insertion slots 14a and 15a.
A pair of waterproofing agent discharge bodies 21c and 21d having flat holding surfaces 21a and 21b opposed to both side surfaces of the wire group W held in parallel in a row are provided. The waterproofing agent discharge body 2
1c and 21d are provided with water-stopping agent storage chambers 21e and 21f for introducing the supplied water-stopping agent 22, respectively, and the holding surfaces 21a and 21b communicate with the water-stopping agent storage chambers 21e and 21f. The nozzles 21g are provided so as to project in directions facing each other. The nozzle 21g is formed into a small-diameter pipe shape that can be inserted between the wires of the wire group W and is tapered.
The opposed nozzles 21g of 1c and 21d are arranged so as to be shifted from each other.

The water-stopping agent discharging members 21c and 21d are
At the upper end portion of the waterproofing agent introduction section 21h, the waterproofing agent storage chamber 21e, 2
1f so as to communicate with each other, so that one of the waterproofing agent discharge bodies 21d is hinged to the other waterproofing agent discharge body 21c.
i can be opened and closed. A cartridge 23 filled with the water-stopping agent 22 is detachably connected to the upper part of the water-stopping agent introduction section 21h,
The water stopping agent 22 delivered at a is discharged from the nozzle 21g toward the wire group W. The nozzle 21
g protrudes in a range of a width corresponding to the waterproof section X, which is the application range of the water stopping agent 22.

Next, a method of waterproofing the wire harness using the waterproofing jig 11 and the waterproofing agent discharger 21 will be described with reference to FIG. The electric wire w is held and wired by the electric wire receiving jig 20 (shown in FIG. 2). A waterproofing jig 11 is arranged at a position where the grommet 1 is attached, and the wire group W is inserted between the pair of wire holding members 14 and 15. At the time of the insertion, the wire holding members 14 and 15 have the wire insertion slots 14a, 1
In FIG. 5a, since both ends of the upper end openings 14b and 15b are open, even if the wire group W is arranged in a lump, when the wire group W is pushed in, the wire insertion length is kept in a state where the wires w are aligned one by one. It is pushed into the holes 14a, 15a. That is, as shown in FIGS. 4A and 4B, in the waterproof section X, the wires are laid in a state where they are arranged adjacent to one another in the vertical direction.

After completing the wiring of the wire group W on the wiring board 10, as shown in FIGS. 4B and 4C, the waterproofing agent discharger 21 is provided on both side surfaces of the wire group W arranged in a line. Clamping surfaces 21a, 2
1b are opposed to each other, and the waterproofing agent discharge bodies 21c, 21d
Place. At this time, one of the waterproofing agent discharge bodies 21d is in an open state so as to easily pinch the wire group W. After disposing on both sides of the wire group W and closing it, a large number of nozzles 21g can be connected to the wire group W. And the electric wire group W is loosened. Then, the water-stopping agent 22 is sent out from the cartridge 23, so that both the water-stopping agent discharging members 21c,
The waterproofing agent 22 is discharged from both sides from the nozzle 21g of 1d toward the wire group W, and the waterproofing agent 22 permeates between the wires w.

The water-stopping agent 13 has a viscosity of 1000-2000.
Poise, a silicone-based water stopping agent, a modified ester resin, a synthetic rubber-based water stopping agent, etc. are used.

Next, the discharging operation of the water stopping agent 22 is completed,
As shown in FIG. 4D, the locking means 16 of the waterproof jig 11
Is released and the substrate 13 is lowered, so that the wire holding material 1
The wire group W is removed by lowering the water waterproofing agent discharge body 21d and lowering the water stopping agent discharger 21 from the wire group W.

After removing from the waterproof jig 11 as described above,
A thin film 24 made of PVC or the like is put on the surface of the electric wire group W to which the waterproofing agent 22 of the waterproof section X is applied. This is to prevent the waterproofing agent 22 from sticking to the hands of the worker. After covering the film 24, the electric wire w is rolled up inside the film 24 as shown in FIG. Shape.

Then, as shown in FIG. 4 (F), a tape 25 is wound around the outer periphery of the film 24 to keep the wire group W in a circular cross section, and the applied waterproofing agent 22 diffuses and leaks. To prevent Thereafter, the grommet 1 is attached to the wire group W by passing the grommet 1 through the waterproof section X as shown in FIG.

[0027]

As is clear from the above description, according to the method for waterproofing a wire harness according to the present invention, a portion where a grommet needs to be attached and subjected to waterproofing at the time of wiring a wire in a wire harness assembly line. A waterproofing agent can be applied to the electric wire group. That is, conventionally,
The waterproofing agent application step, which had to be performed in a separate step, can be performed on the wire harness assembly line, and the waterproofing step can be simplified and speeded up.

For a group of electric wires arranged in a line,
To discharge the water-stopping agent by inserting a number of nozzles projecting from the water-stopping agent discharge body from both sides, the wires are loosened and the gap between the wires is effectively filled with the water-stopping agent And the operation can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a waterproofing jig and a waterproofing agent discharger.

FIG. 2 is a perspective view showing a state where the waterproofing jig and the waterproofing agent discharger are attached to a wiring board.

FIG. 3 is a perspective view of a waterproofing agent discharger.

FIGS. 4A to 4G are views showing a waterproofing step.

FIG. 5 is a sectional view showing a waterproof structure of a conventional grommet.

FIG. 6 is a schematic view showing a conventional grommet waterproofing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet w Electric wire W Electric wire group 10 Wiring board 11 Waterproof jig 14, 15 Electric wire holding material 21 Waterproofing agent discharger 21a, 21b Clamping surface 21c, 21d Waterproofing agent discharge body 21e, 21f Waterproofing agent storage chamber 21g Nozzle 22 Waterproofing agent 24 Film

Claims (3)

[Claims] 1. A part for waterproofing between wires of a wire harness inserted into a mounting grommet in a panel through-hole, and a part for waterproofing between the wires when a wire group is laid when a wire harness is assembled. Are arranged side by side in a row so that a plurality of nozzles are protrudingly provided on both sides of the side-by-side wire group. In such a way as to be inserted into the gap, a water-stopping agent having a required viscosity is discharged from these nozzles so as to penetrate between the wires, and then a film is put on the portion where the water-stopping agent is applied and rounded into a circular cross section. A method for waterproofing a wire harness, comprising: winding a tape around the outer periphery of the film; and passing the film through the grommet. 2. A water-stopping agent discharger used in the waterproofing method according to claim 1, wherein a pair of water-stopping agent dischargers have a flat holding surface opposed to both side surfaces of a group of electric wires arranged side by side. A body is provided, and a water-stopping agent storage chamber to which a water-stopping agent is supplied is provided inside the water-stopping agent discharge body, and the holding surface is connected to the water-stopping agent storage chamber so that a wire group is formed. Protruding a number of nozzles inserted into the gap,
A water-stopping agent discharging machine characterized in that both opposing water-stopping agent discharge plates are connected so as to be opened and closed. 3. The water-stopping agent discharging machine according to claim 2, wherein the nozzles projecting from the pair of water-stopping agent discharge plates are arranged to face each other with their positions shifted from each other.