JPH07193935A - Waterproofing method of wire joint - Google Patents

Abstract

PURPOSE:To spread a sealing material over all the corners of a wire joint by winding a liquid absorbing material, containing a predetermined quantity of water swelling single liquid elastic sealant and cut into a required size, around a part where stripped wires are jointed and then winding a waterproof insulating film for predetermined number of turns. CONSTITUTION:A liquid absorbing material 11, e.g. paper or sponge, is cut into a required size and a stripped wire joint 4 is set thereon. A predetermined quantity of water swelling single liquid elastic sealant 12 having low viscosity is dripped and absorbed by the liquid absorbing material 11. The water absorbing sheet 11 is then wound around the wire joint 4 followed by winding of an electric insulating vinyl tape 13. Consequently, the sealant 12 oozes out from the water absorbing sheet 11 and spreads over all corners of the wire joint 4 thus facilitating the waterproofing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method for an electric wire connecting portion to which an end portion of an electric wire having a stripped coating is connected, and more particularly to a waterproofing method for an electric wire connecting portion of a wire harness used in an automobile or the like.

[0002]

2. Description of the Related Art An electric wire connecting portion to which an end portion of an electric wire, which is stripped of a coating, is connected has a structure as shown in FIG. 3, for example. In the figure, 1 is a connection terminal, 2 is an electric wire, and 3 is a bare wire from which the coating of the electric wire 2 has been peeled off. The electric wire connecting portion 4 requires waterproofing in order to prevent an electrical short circuit and prevent corrosion. Conventional waterproofing methods include
For example, there are the following methods. That is, 1) A pad of a viscous sealant is adhered to an elastic sheet, and the pad is wound around an electric wire connecting portion (Japanese Patent Laid-Open Publication No. Hei 1
-206573). 2) A fixed amount of waterproof insulating adhesive is laid on the waterproof insulating waterproof film, and the electric wire connection part with the waterproof insulating auxiliary waterproof film attached on the upper side is pressed as it is and embedded in the laid sealant part. The waterproof film is wound around the electric wire connecting portion (Japanese Patent Laid-Open No. 4-334917).
No.). 3) Cover the wire connection with a vinyl tube and seal both ends of the vinyl tube by high frequency welding.

[0003]

However, the conventional waterproofing methods have the problems that the steps are complicated, the workability is poor, and the mass productivity is not achieved. That is, 1) In the first method, only a high-viscosity putty-like sealant can be used, and a pressure treatment is required to spread this sealant to the wire connection portion. 2) In the second method, a low viscosity sealant cannot be used. 3) In the third method, it is necessary to pass the electric wire through the vinyl tube before connecting the electric wire, which makes the work difficult.

[0004]

SUMMARY OF THE INVENTION The present invention provides a method for waterproofing an electric wire connecting portion which solves the above-mentioned problems. It is a liquid-absorbing material obtained by quantitatively measuring a water-expandable one-liquid elastic sealant and cutting it into a required size. Wrap the liquid-absorbent material around the wire connecting part where the coating is peeled off and the wires are connected to each other, and then the waterproof insulating film cut to the required size is wound around the outside of the liquid-absorbent material. Sealing is the first invention, and a water-expandable one-liquid elastic sealant is quantitatively measured and dropped onto a half-cracked insulating tube cut into a required size to form a sealant part, and then the sealant part is formed. A second aspect of the present invention is to embed a wire connection part in which the coating is peeled off to connect the wires to each other, and then wind and seal a waterproof insulating film cut into a required size.

[0005]

[Function] The water-swellable one-liquid elastic sealant has a pasty viscosity and adhesiveness, is cured after a certain period of time and has the same function as a rubber material, and absorbs moisture in the air, When it comes into contact with water, it has the property of expanding its volume several times. Therefore,
As described above, when the electric wire connection part is embedded in the water-swellable one-liquid elastic sealant and the waterproof insulating film is wrapped around the outside, if water or moisture enters the inside of the waterproof insulating film, water expansion will occur. The one-liquid elastic sealant expands, the gap between the electric wire connecting portion and the waterproof insulating film wound around the electric wire connecting portion is filled, and the electric wire connecting portion is effectively waterproofed. Therefore, as in the first invention, a water-swellable one-liquid elastic sealant is quantitatively included in a liquid-absorbent material that is cut to a required size, the coating is peeled off, and the above-mentioned suction is applied to a wire connecting portion where wires are connected to each other. When a liquid substance is wrapped around, a low-viscosity sealant can be used, so that the sealant can be spread to every corner of the wire connection portion. Further, when the waterproof insulating film is wound around the outside of the liquid-absorbent material, the sealing agent partially exudes and further spreads to a small void in the electric wire connecting portion. Further, when the expansive one-liquid elastic sealant is dropped on the half-divided insulating tube to form the sealant portion as in the second aspect of the invention, the low-viscosity sealant is not diffused, and the desired size is obtained. Since the sealing agent portion can be formed, when the electric wire connecting portion is embedded in the sealing agent portion, the sealing agent can be effectively spread only to the electric wire connecting portion to be waterproof.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. Example 1 FIG. 1 is a work process explanatory view of an example of a waterproofing method for an electric wire connecting portion according to the present invention. In this embodiment, the electric wire connecting portion shown in FIG. 3 used in the description of the prior art is waterproofed, and the process is as follows. That is, 1) The electric wire connecting portion 4 is placed on a water-absorbent sheet 11 such as paper or sponge, and a low-viscosity water-expandable one-liquid elastic sealant 12 is quantitatively dropped to the water-absorbent sheet 11 The elastic sealant 12 is absorbed. 2) Next, the water-absorbent sheet 11 is wound around the wire connecting portion 4, and the outer side thereof is wrapped with the vinyl tape 13 for electrical insulation. Then, the water-swellable one-liquid elastic sealant 12 exudes from the water-absorbent sheet 11 and spreads into the voids of the electric wire connecting portion 4. In this embodiment, since the water-swellable one-liquid elastic sealant 12 is absorbed by the water absorbent sheet 11, it does not leak outside the wound vinyl tape 13 for electrical insulation.

Embodiment 2 FIG. 2 is an explanatory view of working steps of another embodiment according to the present invention. The process is as follows. That is, 1) A low-viscosity water-expandable one-liquid elastic sealant 12 is dropped on a half-divided vinyl tube 14 in a fixed amount. 2) Next, the electric wire connecting portion 4 is embedded in the water-swellable one-liquid elastic sealant 12. Then, the water-swellable one-liquid elastic sealant 12 spreads to the voids of the electric wire connecting portion 4 without leaking to the surroundings. 3) Then, from the outside, vinyl tape for electrical insulation 1
Wrap 3

[0008]

As described above, according to the present invention, a water-expandable one-liquid elastic sealant is quantitatively included in a liquid-absorbent material cut into a required size, and the coating is peeled off to connect electric wires to each other. Wrap the liquid absorbing material around the electric wire connection part, or
A fixed amount of water-expandable one-liquid elastic sealant is dropped onto a half-divided insulating tube cut to the required size to form a sealant section, and then the coating is peeled off from the sealant section to connect the wires to each other. Embedded in the wire connection part, and then wound around it with a waterproof insulating film cut to the required size for sealing, so using a low-viscosity one-liquid elastic sealant, the wire connection part There is an excellent effect that the sealing agent can be spread over the voids in every corner of the.

[Brief description of drawings]

FIG. 1 is a work process explanatory view of an embodiment of a waterproofing method for an electric wire connecting portion according to the present invention.

FIG. 2 is a work process explanatory diagram of another embodiment according to the present invention.

FIG. 3 is a perspective explanatory view of an electric wire connecting portion.

[Explanation of symbols]

 1 Connection Terminal 2 Wire 3 Bare Wire 4 Wire Connection 11 Water Absorbing Sheet 12 Water-Expandable One-Liquid Elastic Sealant 13 Vinyl Tape 14 Vinyl Tube

Claims (2)

[Claims] 1. A water-expandable one-liquid elastic sealant is quantitatively included in a liquid-absorbent material cut to a required size, and the coating is peeled off to attach the liquid-absorbent material to an electric wire connecting portion where electric wires are connected to each other. A method for waterproofing a wire connecting portion, which comprises winding and then winding and sealing a waterproof insulating film cut to a required size on the outside of the liquid absorbent material. 2. A fixed amount of a water-expandable one-liquid elastic sealant is dropped onto a semi-cracked insulating tube cut into a required size to form a sealant portion, and then the coating is peeled off from the sealant portion. A method for waterproofing an electric wire connecting portion is characterized in that the electric wire connecting portion in which electric wires are connected to each other is embedded, and then a waterproof insulating film cut to a required size is wound and sealed.