JP3357258B2 - Terminal, its waterproof structure and its waterproofing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal for connecting a plurality of ground wires and the like to a mating power receiving unit and the like, a waterproof structure thereof, and a waterproof method thereof.

[0002]

2. Description of the Related Art The connection between an electric wire and a power receiving unit such as an appliance is performed by inserting a core wire at the end of the electric wire, from which insulation coating has been removed, into a crimp tube of a crimp terminal, and pressing the crimp tube to plastically deform the core wire. After crimping the parts, it is common to crimp the crimp terminals to the power receiving part using fixing means such as bolts. However, in the case of such crimping connection, if the core wire is damaged at the crimping part and the core wire is damaged due to vibration of the equipment in use, some of them will be cut off and the wire will fall off the crimp terminal. It is possible to do it.

To solve such a problem, there is a terminal connection method disclosed in Japanese Patent Application Laid-Open No. Sho 56-67177. In this method, as shown in FIG. 4, after crimping terminal 5 is crimped to core wire 3 of electric wire 1, crimping terminal 5 is immersed in solder bath 7 in which Pb-Su or the like is melted at about 260 ° C. As shown in FIG. 5, soldering is performed so as to penetrate and fill the spaces between the core wires 3 and between the core wires 3 and the crimp terminals 5.
I do. According to this electric wire connection method, the core wires 3 are connected to each other and the core wire 3 and the crimp terminal 5 are connected by soldering. Therefore, even if some of the core wires 3 are cut, no cut is generated. Thus, the wire 1 was prevented from falling off.

[0004]

However, in the above-mentioned conventional terminal connection method, since the immersion operation into the solder bath 7 containing Pb-Su as a main component is necessary, the worker is inconvenienced by lead poisoning or harmful gas. There is a possibility that the influence of the above may occur. In addition, the work of immersion in the solder bath 7 requires steps such as pretreatment, immersion, washing, and drying, and thus has a problem that the work is complicated. Further, in the above terminal connection method, the core wire 3
Solder can penetrate between each other and between the core wire 3 and the crimp terminal 5, but because the molten solder is at a high temperature, the solder cannot penetrate between the insulating coating and the core wire 1, The water that penetrates between the core wires 1 from the end of the insulating coating and cannot penetrate could be waterproofed. The present invention has been made in view of the above circumstances, it is not necessary to perform harmful and complicated immersion work in a solder bath, and a terminal capable of reliably waterproofing the end of the insulating coating and a waterproof structure thereof, and a terminal therefor. It is intended to provide a waterproofing method.

[0005]

According to a first aspect of the present invention, there is provided a terminal for fixing a board to which an electric wire is connected to a mating power receiving section by a fixing means such as a bolt. A through hole for the bolt is formed at the center of the portion, a thermocompression bonding portion for thermocompression bonding a conductor of an electric wire is formed at one end of the substrate portion with the through hole interposed, and a wire holding portion is formed at the other end of the substrate portion, An electric wire path partitioning wall located outside the bolt inserted into the through hole is provided upright at the center of the board portion. Further, the waterproof structure of the terminal according to the present invention is a waterproof structure for waterproofing between an insulating coating of an electric wire connecting a conductor to the terminal and the conductor, wherein the conductor exposed at the end of the electric wire is mounted on a substrate of the terminal. Thermocompression bonding at one end and holding the base end side of the electric wire at the other end of the substrate portion, and providing a bolt insertion space for detouring the electric wire at the center of the substrate portion,
The one end of the substrate, the conductor and the insulating coating are molded together with a thermoplastic resin. Furthermore, the terminal waterproofing method according to the present invention is a waterproofing method for waterproofing between the conductor and the insulating coating of an electric wire connecting the conductor to the terminal, wherein the conductor exposed at the end of the electric wire is connected to the terminal board. After thermocompression bonding to one end of the wire, holding the base end side of the wire crimped to the other end of the board portion, and then immersing the wire portion up to the insulating coating portion in a molten thermoplastic resin with one end of the board portion as the lower end. In this case, the one end of the substrate portion, the conductor, and the insulating coating are molded together with the thermoplastic resin.

In the terminal thus constructed, a thermocompression-bonding portion of the conductor is formed at one end of the substrate portion, and the tip of the electric wire connecting the conductor to the thermocompression-bonding portion, that is, the portion of the insulating coating end which needs to be waterproof is provided at the tip. Be placed. Further, in the waterproof structure of the terminal, one end of the substrate portion, the conductor and the insulating coating are molded together with a thermoplastic resin, so that water penetrating between the core wires from the end of the insulating coating and entering is waterproofed. Furthermore, in the waterproofing method of the terminal,
By dip-molding with a molten thermoplastic resin, one end of the substrate portion, the conductor and the insulating coating can be sealed at a time with the thermoplastic resin, eliminating the need for harmful and complicated immersion work in a solder bath.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a terminal, a waterproof structure thereof, and a waterproof method according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a terminal according to the present invention, and FIG. 2 is a perspective view of a state where an electric wire is connected to the terminal of FIG. The terminal 21 is formed by, for example, punching or bending a substrate portion 23 made of one conductive metal material. Further, the substrate portion 23 is formed, for example, in a disk shape that can secure a certain amount of electric wire mounting space. One end of the substrate portion 23 in the diameter direction is provided with the substrate portion 23.
Is formed to have a rectangular crimping portion 25 extending from the outer periphery.
The other end of the substrate portion 23 in the diametrical direction is the same as the substrate portion 2.
3 is formed with a rectangular electric wire holding portion 27 extending from the outer periphery.

The crimping portion 25 is formed with a predetermined thickness so that the conductor of the electric wire 29 can be thermocompression-bonded. In addition, upstanding walls 31, 31 are provided on both sides of the crimping portion 25, and the upstanding walls 31, 31 work to hold the conductor during thermocompression bonding. Wound pieces 33, 33 are provided on both sides of the electric wire holding portion 27, and the wrapped pieces 33, 33 are wound around the outer circumference of the bundle of electric wires 29 by being pressed, and the bundle of electric wires 29 is bundled in the substrate portion 23. To be held.

A through hole 35 is formed in the center of the substrate 23, and the through hole 35 allows a bolt 37 to be screwed into a power receiving unit (not shown). In the center of the board portion 23, for example, a pair of electric wire path partition walls 39, 39 with a through hole 35 interposed therebetween.
The wire path partition walls 39, 39 are capable of accommodating the head 37a of the bolt 37 in a space facing each other.

Next, a procedure for connecting the electric wire 29 to the terminal 21 configured as described above will be described with reference to FIG. FIG. 3 is an explanatory diagram showing a procedure for connecting an electric wire to the terminal of FIG.
First, the plurality of, for example, grounding wires 29 are cut off at the ends of the insulating coating 41 to expose the conductor 43. Electric wire 29
Is placed on the wire holding portion 27, and the conductor 43 exposed at the distal end of the electric wire 29 is matched with the crimping portion 25, and the conductor 43 is thermocompression-bonded to the crimping portion 25 (FIG. 3).
(A)).

Next, the electric wire 29 is connected to the electric wire path partition wall 39,
After being separated around the outer periphery of the wire 39, the winding pieces 33, 33 are pressed and wound around the outer periphery of the electric wire 29, and the electric wires 29 are collected and held by the electric wire holding portion 27 (FIG. 3B). Therefore, in this state, the electric wire 29 is a conductor 43 in which the terminal 21 is integrally attached at a portion behind the distal end and the distal end is thermocompression-bonded to the crimping portion 25 of the terminal 21. In this state, the electric wire 29 is supported with the crimping portion 25 and the conductor 43 facing downward, and the crimping portion 25 and the conductor 43 are immersed in a tank 47 in which the thermoplastic resin 45 is heated and melted. , And the insulating coating 41 are molded together (FIG. 3C). At this time, if the thermoplastic resin 45 is melted so as to have a viscosity of about 100 P (poise) or less, the thermoplastic resin 45 can penetrate into the space between the conductors 43 and be waterproofed by a more dense mold. Become. Thereby, the connection between the terminal 21 and the electric wire 29 is completed, and the terminal 21 is attached to the distal end side of the electric wire 29 (FIG. 3).
(D)).

Incidentally, as the thermoplastic resin 45, for example, PES-120L (polyester type) manufactured by Toa Gosei Chemical Industry Co., Ltd. can be used.

In the waterproof structure in which the terminal 21 and the electric wire 29 are connected in this manner, the tip of the electric wire 29 is
Between the conductor 43 and the insulating coating 41.
9, a bolt insertion space 51 is formed between the mold part 49 and the electric wire holding part 27 and secured by bypassing the electric wire 29 by the electric wire path partition walls 39, 39. The terminal 21 electrically connects the conductor 43 of the electric wire 29 to a device or the like by inserting the bolt 37 into the bolt insertion space 51 and screwing it into a mating power supply unit of a device or the like (not shown).

[0014]

As described above in detail, according to the terminal of the present invention, by forming the thermocompression bonding portion of the conductor at one end of the substrate, the tip of the electric wire connecting the conductor to the thermocompression bonding portion,
In other words, the portion of the insulating coating that needs to be waterproof can be placed at the tip, and only the portion that is desired to be sealed is easily dip-molded with respect to the conventional terminal provided with the electrical contact portion that interferes with waterproofing at the tip. Will be able to do it. Further, according to the waterproof structure of the terminal according to the present invention, the detachment of the electric wire can be prevented by the fixing portion of both the thermocompression bonding portion and the holding portion, and one end of the substrate portion, the conductor and the insulating coating are molded together with a thermoplastic resin. By doing so, it is possible to reliably waterproof the water that penetrates between the core wires from the end of the insulating coating and penetrates, and waterproof performance can be easily obtained regardless of the number of electric wires. Furthermore, according to the terminal waterproofing method of the present invention,
Since it is dip-molded with molten thermoplastic resin,
It is not necessary to perform harmful and complicated immersion work in the solder bath, so that work safety can be improved, and the work process can be simplified and workability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a terminal according to the present invention.

FIG. 2 is a perspective view showing a state where an electric wire is connected to the terminal of FIG. 1;

FIG. 3 is an explanatory view showing a procedure for connecting an electric wire to the terminal of FIG. 1;

FIG. 4 is a cross-sectional view showing a soldering state of a conventional terminal.

FIG. 5 is a sectional view of a conventional terminal in a state where electric wires are connected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Terminal 23 Board part 25 Thermocompression bonding part 27 Electric wire holding part 29 Electric wire 35 Through hole 37 Bolt 39 Electric wire path partition wall 41 Insulation coating 43 Conductor 45 Thermoplastic resin 51 Bolt insertion space

Continuation of the front page (56) References JP-A-8-37044 (JP, A) JP-A-60-95874 (JP, A) JP-A-59-63675 (JP, A) JP-A-63-116978 (JP) , U) Actually open 1987-200255 (JP, U) Actually open 1987-142171 (JP, U) Actually open 1979-65774 (JP, U) Actually open 1979-114068 (JP, U) 28-8969 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01R 11/12

Claims (3)

(57) [Claims] 1. A terminal for fixing a board portion to which an electric wire is connected to a mating power receiving portion by a fixing means such as a bolt, wherein a through hole for the bolt is formed in the center of the board portion, and the board is sandwiched between the through holes. One end is formed with a thermo-compression part for thermo-compressing the conductor of the electric wire, and the other end of the board is formed with a wire holding part, and the wire path partitioning wall located outside the bolt inserted into the through hole is connected to the board part. A terminal characterized by being erected in the center of the terminal. 2. A waterproof structure for waterproofing between an insulating coating of an electric wire connecting a conductor to a terminal and the conductor, wherein the conductor exposed at the end of the electric wire is thermocompression-bonded to one end of a substrate of the terminal. Holding the base end side of the electric wire at the other end of the substrate portion, providing a bolt insertion space for bypassing the electric wire in the center of the substrate portion, and molding the one end of the substrate portion, the conductor and the insulating coating together with a thermoplastic resin. Characteristic waterproof structure of terminals. 3. A waterproofing method for waterproofing between an insulating coating of an electric wire connecting a conductor to a terminal and the conductor, wherein the conductor exposed at the end of the electric wire is thermocompression-bonded to one end of a substrate of the terminal. After caulking and holding the base end side of the electric wire to the other end of the board portion, immersing up to the insulating coating portion of the electric wire in a molten thermoplastic resin with one end of the board portion as the lower end, the one end of the board portion, A method of waterproofing a terminal, wherein the conductor and the insulating coating are molded together with the thermoplastic resin.