JPH0828240B2 - Crimping connection structure for electric wires and crimping connection method - Google Patents

Description

The present invention relates to an electric wire crimp connection structure and an electric wire crimp connection method for improving electric characteristics of electric wires.

[Conventional technology]

FIG. 7 is a plan view showing a crimp connection structure of electric wires using joint terminals, and FIG. 8 is a BB sectional view thereof.

The joint terminal 28 is formed by connecting a pair of crimping pieces 30, 30 facing each other on both sides of a board part 29, and the core wire 33, of the two covered electric wires 31, 32 with respect to the board 29. 34 are placed in parallel, and the crimping pieces 30, 30 are crimped to the core wires 33, 34 by a crimping tool (not shown). Where each core wire 3
3, 34 are arranged side by side, and are in contact with each other via the central portion (shown by a chain line B in FIG. 8) and the substrate 29.

However, in the above conventional structure, the crimping piece 3
0, 30 crimping direction (indicated by arrow C in Fig. 8) and core wire 3
The directions of contact with each other (arrow D) are orthogonal to each other. Therefore, since the contact force between the core wires 33 and 34 is weak, the contact area and the degree of adhesion between the wires are small, and the electrical resistance of the contact portion B increases. In addition, the wires 31 and 32
The fixing force when they were mutually pulled in the direction of the arrow huh in the figure was also weak.

[Problems to be Solved by the Invention]

In view of the above points, it is an object of the present invention to provide a crimp connection structure and a crimp connection method for electric wires, which can improve electric characteristics (contact resistance) and mechanical characteristics (fixing force) between electric wires. And

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention relates to a terminal in which a crimping piece is formed on both sides of a board part, the core wires of a plurality of electric wires are superposed on the board part, and the electric wire is crimped and crimped by the crimp piece In the crimp connection structure according to claim 1, the core wires of the plurality of electric wires are flattened and widened and overlapped with respect to the board part, and the crimp connection structure of the wires is crimped to both sides of the board part. In the crimp connection method of superposing core wire of a plurality of electric wires on the board part of the terminal which is connected in series and crimping and crimping with the crimping piece, the core wire of one of the electric wires is placed on the board part, The core wire is compressed by a press to flatten the surface of the core wire,
Each of the crimp connection methods is characterized in that the core wire of the other electric wire is superposed on the surface of the core wire and compressed by a press, and then the crimping piece is caulked and crimped.

[Work]

By expanding the core wire of each wire in the flat shape and overlapping them on the board, the contact area between the core wire of one wire and the core wire of the other wire is wider than when not flattening. The electrical contactability and the mechanical fixing property of the electric wires are increased. In addition, by compressing the core wire of one of the electric wires, and compressing the core wire of the other electric wire by superimposing it on the surface of the core wire,
The adhesion of the wires to each other is increased, as is the electrical contact and mechanical adhesion.

〔Example〕

FIG. 1 is a plan view showing a crimp connection structure of electric wires according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

In the crimp connection structure, the core wire 4 of one covered electric wire 3 is flatly widened and placed on the board portion 2 of the joint terminal 1 similar to the conventional one, and is placed on the one core wire 4. Similarly, the core wire 6 of the other covered electric wire 5 is flattened and placed in the same manner, that is, the core wires 4 and 6 are superposed on the substrate portion 2 in two upper and lower layers, and the joint terminal 1 The crimping pieces 7, 7 are crimped to the other core wire 6 in the stacking direction of the core wires 4, 6. Where each core wire 4,6
Are in contact with each other at almost the center of the height h (shown by the chain line a).

Here, it is also possible to superimpose the core wires 4, 6, ... Of the plurality of electric wires 3, 5 ,. Further, instead of the joint terminal 1, a crimp terminal 8 as shown in FIG. 3 can be used. In this case, the substrate 9 is covered with a covered electric wire.
The core wires 12 and 13 of 10 and 11 are piled up in layers and crimped pieces 14 and 14
The caulking is similar to the above example. In the figure, 15 indicates a crimping piece for the covering portion 16.

FIGS. 4A to 4E are vertical cross-sectional views showing the crimping and connecting method according to the present invention in the order of steps.

That is, first, the terminal 18 is set on the anvil 17, and one core wire 20 is placed on the substrate portion 19 of the terminal 18 (FIG. (A)). Next, an indenter 22 having a rectangular pressing plane 21 attached to a pressing machine (not shown) compresses the core wire 20 to widen it into a flat shape to form a flat surface 23 (FIG. (B)). ). Further, the other core wire 24 is placed on the flat surface 23 (Fig. (C)), and is compressed again from above the core wire 24 by the indenter 22 (Fig. (D)). Lastly, the crimping pieces 27, 27 are curled inward by a crimper 26 having a pair of troughs 25, and a crimping force is applied in the superposing direction of the core wires 20, 24 to complete the crimping. It is also possible to omit the crimping step shown in FIG. 6D and substitute compression in the crimping step shown in FIG. Further, without using the press machine (indenter 22), the core wires 20 and 24 are manually overlaid on each other (that is, the steps of FIGS. (B) and (d) described above are omitted), and the direct drawing (e Even if pressure is applied in the crimping step of), a considerable effect can be obtained.

That is, a plurality of core wires 20, 24 are superposed on the substrate portion 19 in layers, and the crimping piece 27 is caulked in the superposing direction. ,
24 The mutual contact force increases, the contact resistance decreases, and the fixing force increases.

FIG. 5 is a comparison data (average value) of electrical characteristics (residual resistance ratio) between the present invention and a conventional structure, and FIG. 6 is a comparison data of mechanical characteristics (fixing force) (solid line ... The present invention, Dashed line ...
(Conventional), and the effect of the present invention is remarkably exhibited. In the figure, the horizontal axis shows the swaging height h (see FIG. 2).

〔The invention's effect〕

As described above, according to the present invention, the contact area and adhesion between the core wire of one electric wire and the core wire of the other electric wire are increased, so that the electrical characteristics of the connected electric wires are improved and the contact resistance is improved. Is reduced. At the same time, the fixing force between the electric wires is increased to prevent the wires from coming off due to an unexpected pull or the like.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the crimp connection structure of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a perspective view showing another example, and FIG. ) To (e) are longitudinal sectional views showing one embodiment of the crimp connection method, FIGS. 5 to 6 are graphs showing effects, FIG. 7 is a plan view showing a conventional example, and FIG. 8 is FIG. FIG. 1 …… Joint terminal, 2,9,19 …… Board part, 3,5,10,11 …… Electric wire, 4,6,12,13,20,24 …… Core wire, 7,1
4,27 …… Crimping piece, 8 …… Crimping terminal, 18 …… Terminal, 22 ……
Indenter, 23 ... flat surface.

Claims (2)

[Claims] 1. A crimp connection structure of electric wires in which core wires of a plurality of electric wires are superposed on the board portion of a terminal in which crimp pieces are connected to both sides of a board portion and crimped and crimped by the crimp pieces. A crimping and connecting structure for electric wires, wherein core wires of the plurality of electric wires are flattened and widened and superposed on a substrate portion. 2. A crimp connection method in which core wires of a plurality of electric wires are superposed on the board portion of a terminal in which crimp pieces are connected to both sides of the board portion, and the crimp pieces are crimped and crimped to each other. One core wire of the electric wire is placed, the core wire is compressed by a press to form a flat surface of the core wire, and the core wire of the other electric wire is superposed on the surface of the core wire. A crimping and connecting method characterized in that the crimping piece is crimped and crimped after being compressed by a press.