JPH07282945A - Wire connection method - Google Patents

Abstract

PURPOSE:To reduce the number of part items, and downsize a device by spirally winding a conductor of a branch line terminal around a branch line winding part, which is formed by folding a conductor exposed part at an intermediate part of a main line, and melting it for joining. CONSTITUTION:An exposed part 31 of a conductor 29, of which insulating body 27 is peeled on the way of a main line 23, is projected and folded in the direction for crossing the axial direction of the main line 23, and a branch line winding part 33 is formed. Both conductors of the main line 23 and the branch line 25 are welded with each other, and electrically and mechanically connected to each other by melting the tip 43 of a link part 35, which is formed by spirally winding conductors 37 of a terminal part of the branch line 25 around the winding part 33. With this jointing method, since a dedicated joint is unnecessary, the number of part items is reduced, and a device is downsized and lightened, and the manufacturing cost is reduced. Irradiation of the lase beam is desirably used to melt the tip 43.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire connecting method for connecting a branch line terminal in the middle of a trunk line.

[0002]

2. Description of the Related Art FIG. 4 shows the structure of a terminal portion disclosed in Japanese Utility Model Laid-Open No. 57-90576. In this structure, the disk-shaped fused portions 3 and 4 are formed at the tip of the terminal 1, and the terminal portion of the electric wire 7 is wound and connected between these fused portions 3 and 4. Then, the melting portion 3 on the tip end side is melted by irradiation with laser light or the like to connect the terminal portion of the electric wire 7 to the terminal 1.

FIG. 5 shows a connecting portion in which the middle of the trunk line 9 is connected to the middle of the branch line 11 by using the structure of the terminal portion. According to this connection method, the joint terminal 1 has disc-shaped fused portions 13, 15, and 17 at both ends and an intermediate portion.
9 is used.

In order to connect the terminal portion of the branch line 11 in the middle of the main line 9, first, the melting portions 15 and 1 of the joint terminal 19 are connected.
The conductor 21 exposed by peeling off the insulator is wound between 7 and connected. Next, after wrapping the end portion of the branch wire 11 between the melting portions 13 and 15, the melting portion 13 is melted by irradiation with laser light or the like, and the end portion of the branch wire 11 is welded to the joint terminal 19. As a result, the main line 9
The terminal portion of the branch line 11 is connected midway.

[0005]

However, in the above connection method, the dedicated joint terminal 19 for connecting the trunk line 9 and the branch line 11 is required, so that the trunk line 9
Is large, and the connection between branch line 11 and joint terminal 1
Weight increases by 9 minutes. Further, since the dedicated joint terminal 19 is required, there is a problem that the number of parts is large and the manufacturing cost is high.

[0006] Therefore, an object of the present invention is to provide a method of connecting electric wires which can reduce the number of parts, and can be reduced in size and weight.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 is an electric wire connecting method for connecting an end of a branch line in the middle of a main line covered with an insulator, in the middle of the main line. Part of the insulation of the part is peeled off to form an exposed part where the conductor is exposed. After forming the connecting portion by melting, the connecting portion is melted and the terminal of the branch line is connected in the middle of the trunk line.

The invention according to claim 2 is the invention according to claim 1, wherein the branch wire winding portion is formed in a convex shape in which a conductor is projected in a direction intersecting with an axis method of the trunk line. It is characterized by that.

The invention according to claim 3 is the invention according to claims 1 and 2, characterized in that the tip of the branch wire winding portion is melted.

The invention according to claim 4 is the invention according to claims 1, 2, and 3.
The invention described above is characterized in that the tip end portion of the branch wire winding portion is irradiated with laser light to be melted.

[0011]

According to the invention of claim 1, the insulator in the middle of the main line is peeled off to form the exposed portion of the conductor. After the exposed portion is bent to form the branch wire winding portion, the end portion of the branch wire is spirally wound around the branch wire winding portion to form the connecting portion. Then, this connecting portion is melted and the end portion of the branch line is welded to the conductor of the main line. As a result, the branch line is connected in the middle of the main line.

In this case, since it is not necessary to use a dedicated joint terminal, the number of parts can be reduced and the weight of the joint terminal can be reduced. Furthermore, the end of the branch line is directly connected to the conductor of the main line,
Since a dedicated joint terminal is not required, the connecting part becomes smaller.

According to the second aspect of the present invention, the branch line winding portion is formed into a convex shape, and the terminal portion of the branch line is wound around the convex portion, so that the conductor of the main line is easily melted. Strength can be improved.

According to the third aspect of the present invention, the end portion of the branch line can be firmly connected to the branch line winding section by melting the tip portion of the branch line winding section.

According to the invention of claim 4, since the laser beam is used to melt the branch wire winding portion, the tip portion of the branch wire winding portion is melted in a non-contact state with the connecting portion. You can

[0016]

EXAMPLES Examples of the electric wire connecting method according to the present invention will be described below. FIG. 1 shows a connecting portion of a trunk line 23 and a branch line 25 connected by this method, (a) is a perspective view,
(B) is sectional drawing of the state before melting, (c) is sectional drawing which shows the melted state. First, trunk line 23 and branch line 25
The connection part of will be described.

As shown in FIG. 1A, in the middle of the main line 23, an exposed portion 31 is formed in which the insulator 27 is peeled off and the conductor 29 is exposed. The exposed portion 31 has an intermediate portion protruding and bent in a direction intersecting the axial direction of the main line 23 to form a branch wire winding portion 33. A conductor 37 at the end of the branch line 25 is spirally wound around the branch line winding portion 33 to form a connecting portion 35. The tip end side of the connecting portion 35, that is, the tip end portion of the branch wire winding portion 33 is melted. In this molten portion, as shown in FIG. 1C, the branch line 25 spirally wound around the branch line winding portion 33.
A part of the conductor 37 of FIG.
Are welded together, and are electrically and mechanically connected.

Next, a connection method for connecting the terminal portion of the branch line 25 in the middle of the main line 23 will be described with reference to FIGS.
This will be described with reference to (c), FIGS. 3 (a) and 3 (b).

As shown in FIG. 2 (a), the insulator 27 at the middle portion of the main line 23 is provided with a peeling blade 3 of a peeling machine (not shown).
After cutting with 9, 39, open both sides of the cut,
As shown in FIG. 2B, the conductor 29 inside is exposed to form an exposed portion 31.

Next, as shown in FIG. 2C, the exposed portion 3
1 is projected in a direction intersecting the axial direction of the main line 23 and bent into a convex shape to form a branch line winding portion 33. Then, as shown in FIG. 3A, the conductor 37 at the end portion of the branch line 25 is spirally wound around the branch line winding portion 33. At this time, the conductor 37 at the end portion of the branch line 25 is wound so that the tip end portion 43 of the branch line winding portion 33 remains.

Then, as shown in FIG. 3B, the spot 41 of the laser light is applied to the tip portion 4 of the branch wire winding portion 33.
The tip end portion 43 of the branch wire winding portion 33 is heated and melted by hitting 3 against. When the tip portion 43 of the branch wire winding portion 33 is melted, the conductor 29 of the trunk wire 23 is melted so as to cover the conductor 37 of the terminal portion of the branch wire 25, as shown in FIG. As described above, the terminal portion of the branch line 25 is electrically and mechanically connected to the middle of the main line 23.

According to the electric wire connecting method of the present embodiment, the conductor 29 of the trunk line 23 is connected to the conductor 37 of the end portion of the branch line 25.
Since it is welded directly, joint terminals are not required. Therefore, since it is not necessary to set a dedicated joint terminal, the number of parts can be reduced.

Further, without using a joint terminal,
Since the terminal portion of the branch line 25 is directly welded to the conductor 29 of the main line 23 and the conductor 37, the connecting portion 35 is generally small and lightweight. Therefore, the manufacturing cost can be reduced.

In addition, in the connection method of this embodiment, the main line 23
A branch wire winding portion 33 having a convex shape is formed on the conductor 29, and the conductor 3 of the branch wire 25 is formed on the branch wire winding portion 33.
7 is spirally wound and the tip end of the branch wire winding portion 33 is melted, so that the wound branch wire 2 is wound.
The conductor 37 portion of No. 5 is covered with the molten portion. Therefore, the mechanical strength of the connecting portion can be improved.

In the above embodiment, the branch wire winding portion 33 is formed by irradiating with laser light and melting.
It is possible to melt around the tip part of. In addition to irradiation with laser light, an electrode or the like may be used as a means for melting the tip portion of the branch wire winding portion 33 so as to heat it.

[0026]

As described above, according to the invention of claim 1, the insulator in the middle portion of the main line is peeled off to form the exposed portion where the conductor is exposed, and the exposed portion of the end of the branch line. After connecting the conductors to form the connecting portion, the connecting portion is melted to connect the end of the branch line in the middle of the main line,
The need for joint terminals is eliminated, the number of parts can be reduced, and the size and weight can be reduced. Therefore, the cost can be reduced. Further, by spirally winding the conductor of the end of the branch line around the branch line winding portion to form the connecting portion, it is possible to improve the strength of the connection portion between the conductor of the trunk line and the conductor of the branch line. I can.

According to the invention of claim 2, the branch wire winding portion is formed in a convex shape in which the conductor is projected in a direction intersecting with the axis method of the trunk line, so that the branch wire and the branch wire are branched. The strength of the connecting portion of the wire with the conductor can be improved.

According to the invention of claim 3, in the inventions of claims 2 and 3, by melting the tip end of the branch wire winding portion, the melted portion covers the conductor of the branch wire. The strength of the connecting portion between the conductor of the trunk line and the conductor of the branch line can be improved.

According to the fourth aspect of the present invention, by irradiating the tip portion of the branch wire winding portion with laser light to melt it, only the tip portion of the branch wire winding portion can be surely melted. Furthermore, non-contact processing is possible and workability is improved.

[Brief description of drawings]

FIG. 1 shows a trunk line and a branch line connected by an electric wire connecting method according to the present invention, and FIG. 1 (a) is a perspective view showing a connecting portion;
(B) is sectional drawing which shows the connection part before melting, (c) is sectional drawing which shows the connection part after melting.

FIG. 2 shows a procedure of an electric wire connecting method according to the present invention,
(A) is a front view showing a state where an insulator in the middle of a trunk line is cut, (b) is a front view showing a state where an exposed part is formed in the middle of the trunk line, and (c) is a branch line winding part at the exposed part. It is a front view which shows the formed state.

FIG. 3 shows a procedure of an electric wire connecting method according to the present invention,
(A) is a perspective view showing a state in which a conductor of a branch line is spirally wound around a branch line winding part, and (b) is a perspective view showing a state where a tip end of the branch line winding part is irradiated with laser light. Is.

FIG. 4 shows a structure of a conventional terminal portion, (a) is a perspective view showing a state in which a melting portion is not melted, and (b) is a perspective view showing a state in which the melting portion is melted.

FIG. 5 is a perspective view showing a state in which a branch line is connected in the middle of a trunk line by a conventional wire connecting method.

[Explanation of symbols]

 23 Main line 25 Branch line 27 Insulator 29 Conductor 31 Exposed part 33 Branch line winding part 35 Connecting part 37 Conductor 43 Tip part

Claims (4)

[Claims] 1. A method of connecting an electric wire for connecting an end of a branch line in the middle of a trunk line covered with an insulator, wherein an insulator in an intermediate portion of the trunk line is peeled off to form an exposed portion where a conductor is exposed, The exposed portion is bent to form a branch wire winding portion, and the conductor of the end of the branch wire is spirally wound around the branch wire winding portion to form the connecting portion, and then the connecting portion is melted to form the trunk line. A method of connecting electric wires, characterized in that the end of the branch line is connected in the middle of the step. 2. The invention according to claim 1, wherein the branch wire winding portion is formed in a convex shape in which a conductor is projected in a direction intersecting with an axial method of the trunk line. How to connect electric wires. 3. The method according to claim 1, wherein the tip of the branch wire winding portion is melted. 4. The invention according to claim 1, 2, or 3,
A method for connecting electric wires, characterized in that the tip of the branch wire winding portion is irradiated with laser light to be melted.