JPH01241768A - Wire pressing terminal - Google Patents

Abstract

PURPOSE:To improve the pressing/holding force by forming the edge of the core wire calking part in a concave and a convex form or an uneven form. CONSTITUTION:By forming the edge 10b from which the tip 42a of a core wire 42 projects in a concave almost in a circular arc form (in a concave form), the contact length of the core wire 42 can be made large enough. This edge 10b is formed together with the core wire calking part 10 and the coverage calking part 20 simultaneously when the development plate of a wire pressing terminal is made in a punching process. By making the contact length between the edge 10b of the core wire calking part and the core wire 42 sufficiently large in such a way, the pressing/holding force of a wire 40 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a wire crimp terminal with improved crimp holding power for wires.

(Prior Art) Wire crimp terminals used in connectors and the like are manufactured by punching a thin plate of copper, copper alloy, etc. into a predetermined shape and then bending it. As shown, an electrical contact part 30 having a semicircular elastic piece 31, 31 into which a tab terminal is inserted is provided at one end in the longitudinal direction, and a core wire crimping having a roughly U-shaped cross section is provided at the other end. Like the section 10, a covering crimping section 20 having a roughly U-shaped cross section is provided.

Here, on the inner surface of the core wire crimping part 10, a plurality of serrations 11 extending in a direction orthogonal to the longitudinal direction are formed at appropriate intervals.

FIGS. 9 and 10 show a state in which the wire 40 is crimped and held on the wire crimp terminal. In this case, first, the insulating coating 41 is peeled off to expose the core wire 42, and the wire end portion is inserted into the core wire crimping part 10 and the covering crimping part 20, and then the core wire crimping part 10 is inserted into the core wire crimping part 10 by a crimping device (not shown). The core wire 42 is swaged with
1 to crimp and hold the electric wire 40. In addition, the core wire 42
The tip end portion 42a is located at one end edge 10 of the core wire crimping portion 10.
It is made to protrude from a. Further, the compression ratio when crimping the core wire 42 is set to 100% or less. This compression ratio is expressed as follows.

(Left below) Compression rate of inner cross-sectional area of crimping X100% Cross-sectional area of strand before crimping Here, looking at the core wire 42, as shown in FIG. 11, it is compressed by the core wire crimping part 10, The tip portion 42a protruding from the core wire crimping portion 10 expands in a trumpet shape and comes into contact with the edge 10a of the core wire crimping portion 10, while a portion of the core wire 42 bites into the serrations 11. In this case, the resistance force against the force that causes the core wire 42 and the core wire crimping part 10 to separate from each other, that is, the crimping holding force (the force that maintains the crimping tensile strength) is the l between the core wire 42 and the inner surface of the core wire crimping part 42. ! j frictional force, the reaction force of the force trying to pull out the core wire 42 biting into the serrations 11, and the tip portion 4
This force is the sum of the reaction force generated at the edge 10a against the force that attempts to constrict the trumpet-shaped expansion of 2a.

In addition, as another wire crimp terminal, for example, as shown in FIG. A method has been proposed (see Japanese Utility Model Application Publication No. 49-60277).

(Problems to be Solved by the Invention) However, the core wire 42 is easily damaged at the edge portions of the serrations 11 and the edge portions of the slits 12, causing core wire breakage, etc., and there is a fear that the crimping holding force may be reduced due to the W.

This invention was made in order to solve the problems of the above-mentioned conventional technology, and its purpose is to provide a wire crimp terminal that can improve the crimp holding force without causing core breakage or the like. be. .

[Structure J of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention provides a wire crimp terminal having a core wire crimping portion for crimping and holding the core wire of an electric wire. It is characterized in that the edge of the portion is formed in a concave, convex, or uneven shape.

In this invention, "formed in a concave, convex, or uneven shape" means
It means to form in a concave, convex or uneven shape from the viewpoint of increasing the contact length between the edge of the core wire crimping part and the core wire,
The concave shape is not limited to a case where the width is concave in an arc shape, and the concave and convex shape includes not only a gently wavy shape but also an LTA shape.

(Function) When the core wire is crimped with the core wire crimping part, the tip of the core wire expands into a trumpet shape, and the tip comes into contact with the edge of the core wire crimping part, but this edge has a concave, convex, or uneven shape. This allows for a longer contact length with the core wire than in the case of conventional wire crimp terminals that are formed in a straight line, and the reaction force against the force that compresses the tip portion increases accordingly.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 to 5 show a first embodiment of the wire crimp terminal of the present invention, in which the same components as those shown in FIGS. 8 to 11 are denoted by the same reference numerals.

That is, the wire crimp terminal shown here is also manufactured by punching a thin plate of copper, copper alloy, etc. into a predetermined shape and then bending it, and a tab terminal is inserted at one end in the longitudinal direction. An electrical contact portion 30 having four semicircular elastic pieces 31 and 31 is provided, and a covering crimping portion having a roughly U-shaped cross section similar to the core wire crimping portion 10 having a roughly U-shaped cross section is provided on the other end side. 20 are provided. An important point of this invention is that the contact length between the edge 10b of the core wire crimping portion 10 and the core wire 42 is increased to improve the crimp holding force of the electric wire 1140.

In this first embodiment, the end edge 10b of the core wire 42 on the side from which the tip portion 42a protrudes is formed to be concave (concave) in a substantially circular arc shape, thereby increasing the length of contact with the core wire 42. . This edge 10b is formed at the same time as the core wire crimping part 10, the covering crimping part 20, etc. when punching out the expansion plate of the wire crimp terminal (see FIG. 1).

In this way, when the core wire 42 is crimped by the core wire crimping section 10, the contact length between the end edge 10b and the tip portion 42a of the core wire 42 is equal to the conventional straight edge 10a (see FIG. 9). As a result, the reaction force against the force that tends to compress the distal end portion 42a of the core wire 42, which has expanded into a trumpet shape, increases.

Furthermore, since the end edge 10b is concave in a substantially arc shape, some of the core wires 42 are pushed laterally when a force is applied to close the tip portion 42a, so that the straight f! The core wires 42 interfere with each other in a more complicated manner than in the case of the J edge 10a, and this interference generates a new reaction force against the force that attempts to pull out the core wire 42 from the core wire crimping portion 10.

Furthermore, because the core wires 42 interfere with each other in a complicated manner,
Changes in the relative positional relationship between the core wire crimping section 10 and the core wire 42 are also reduced, and a decrease in the frictional force between the inner surface of the core wire crimping section 10 and the core wire 42 is also prevented.

As a result, serration 11 (see Figures 8 and 11)
Even without providing the slit 12 (see FIG. 12), the crimp holding force of the electric wire 40 can be improved. In other words, there is no fear that the core wire will break, and the crimp holding force can be improved.

6 and 7 show a second embodiment of the present invention, in which the end edge 10b is formed in an uneven shape, and other points are the same as the first embodiment.

In this way, the length of contact between the edge 10b and the core wire 42 can be better than in the first embodiment, and
It becomes possible to improve the crimping holding force of 0.

Note that the edge 10b may be formed in a convex shape. Further, the core wire crimping portion 10 is formed to have a substantially U-shaped cross section, and the crimping piece 13
．． 13 shows a case in which the bundle of core wires 42 is divided into two parts υ1 and crimped and held (see FIG. 5), but the present invention is not limited to this. Furthermore, the edge of the covering crimping portion 20 may be similarly formed into a concave, convex, or uneven shape. Furthermore, it goes without saying that the present invention can also be applied to a so-called wire crimping terminal of the type in which the core wires are crimped together, which does not include the covering crimping part 20 or the electrical contact part 30.

[Effects of the Invention] As explained above, according to the present invention, the edge of the core wire crimping portion is formed in a concave, convex, or uneven shape, so that the crimp holding force is improved without causing core wire breakage or the like. I can do it.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the wire crimp terminal of the present invention, FIG. 1 is a developed view of the wire crimp terminal, and FIG.
The figure is a perspective view showing the state before the wire is crimped and held, FIG. 3 is a plan view showing the state where the wire is crimped and held, FIG. 4 is a side view of the same, and FIG. 5 is the v-v line of FIG. 4. 6 and 7 do not show the second embodiment, FIG. 6 is a developed view, and FIG. 7 is a plan view showing a state in which the electric wire is crimped and held; [Figures 8 to 11 show the prior art. Figure 8 is a perspective view showing the state before the wire is crimped and held, and Figure 9 is the state after the wire is crimped and held. Plan view, Figure 10 is the same side view, Figure 11 is XI-X in Figure 9.
It is an enlarged sectional view taken along the line I, and FIG. 12 is a side view showing another conventional technique. 10... Core wire crimping part 10b... End edge 20... Covering crimping part 30... Electrical contact part 40... Electric wire 42... Core wire

Claims (1)

[Scope of Claims] An electric wire crimping terminal having a core wire crimping portion for crimping and holding the core wire of an electric wire, wherein the edge of the core wire crimping portion is formed in a concave, convex, or uneven shape. Characteristic wire crimp terminal.