JPH07296860A - Crimp terminal for wire - Google Patents

Abstract

PURPOSE:To reduce the number of processes for wire connection by boring at least one through hole in the center portion of the wire barrel of a crimp terminal, projecting the edge of the through hole in the direction of crimping of the wire, and enabling the wire to be crimped without peeling the enamel of an enameled wire. CONSTITUTION:A crimp terminal 1 has a mounting hole 4 bored through the end portion of a wire barrel 3 against which a wire 2 is crimped, so that the terminal is screwed to a terminal board or the like by way of the hole 4. Two through holes 5, for example, are bored on the same line through the wire barrel 3, with the edge of each through hole 5 projected upwards and forming an annular edge 6. Both ends of the width of the barrel 3 are curved in the direction of the edges 6 and inclined. The wire 2 is pressed and crimped by the linearly-chamfered tooth shape 91 of a crimping machine 9 and by an anvil 92 having a saucer-shaped top surface. Therefore, the edges 6 break the enamel coating of an enameled wire and bite into the wires 2, thereby securing conductivity and the tensile strength of the wire 2 simultaneously. Since the surface of the wire 2 can be made to escape into the through holes 5, the edges 6 easily bite into the wire 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimp terminal structure for crimping and locking the tip of an electric wire, and more particularly to a crimp terminal suitable for connecting an enamel wire.

[0002]

2. Description of the Related Art Conventionally, a terminal component 10 as shown in FIG. 5A is generally used for screwing an end of an electric wire of an electric device to a terminal board or the like. To crimp the tip of the electric wire 2 to the wire barrel 11 of the terminal component 10, the electric wire 2 may be soldered to the wire barrel 11, or both ends of the wire barrel 11 may be bent as shown in FIG. It is pressed and fixed to 2. Therefore, connect the electric wire 2 to this terminal component 1
It is necessary to completely remove the insulating material coating 12 at the tip end of the electric wire 2 in order to completely connect it to 0 and secure the electric conductivity and the mechanical strength.

When the insulating coating 12 is made of rubber or synthetic resin, it can be peeled off relatively easily by a peeling device, so various automatic peeling devices have been put into practical use, but in the case of an enameled wire. Since an insulating varnish (enamel) is baked and coated on this, it is not easy to peel off this enamel. As described, the enamel must be mechanically removed after the part to be peeled is immersed in a peeling solution, heated, or cooled to a very low temperature. There is a problem that the work efficiency is low as well as complicated, laborious and expensive. Further, there is a problem that the electric wire is deteriorated and its durability is lowered by the chemical and physical actions during the peeling work and the soldering.

Further, the wire barrel 11 of the conventional terminal component 10 as shown in FIG. 5 is bent in a U shape. Then, in order to crimp the electric wire 2, as shown in FIG. 5 (C), the crimping machine 15 as shown in FIG. 5 (B) is pressed by the double-edged blade die 16 and the anvil 17 having a depressed upper surface. Although crimping was performed, at that time, the electric wire 2 was easily displaced, positioning was difficult, and crimping was sometimes incomplete.

As a component for connecting the tips of a plurality of electric wires, as shown in FIG. 6, a groove-shaped projection 1 is formed on the inner surface.
There is a conductive connector 13 provided with 4, and when the electric wire 2 from which the insulating coating 12 has been peeled off is crimped, it is effective to dig into the oxide film on the surface of the electric wire and increase the electric conductivity. However, it was difficult to destroy an enamel coating film such as an enamel wire and to make a complete connection with only the protrusions 14 as described above.

[0006]

SUMMARY OF THE INVENTION The present invention has been developed to develop a crimp terminal which can be crimped without peeling off the enamel of an electric wire, mainly an enamel wire, has a high positional accuracy, and which can be completely connected, thereby making it possible to connect electric wires. The purpose is to reduce labor and cost and improve work efficiency.

[0007]

According to the present invention, at least one through hole is formed in the center of a wire barrel of a crimp terminal, and the edge portion of the through hole is projected in the wire crimping direction to form an edge portion. It has an edge formed on it. Further, according to the present invention, both end portions in the width direction of the wire barrel of the crimp terminal are bent in the direction in which the electric wire is crimped to form an inclined structure.

[0008]

Operation: At least one through hole is formed in the center of the wire barrel of the crimp terminal, and the edge of this through hole is formed as an edge for crimping the wire. This edge breaks the enamel-like insulating coating of the wire and cuts into the wire, resulting in a complete electrical and mechanical connection. Therefore, it is not necessary to peel off the enamel in advance. If both widthwise ends of the wire barrel of the crimp terminal are bent and inclined in the crimping direction, when crimping the wire, the wire is positioned at the center of the wire barrel and completely crimped to the edge.

The size and number of the through holes and the edges may be appropriately selected according to the diameter and number of the electric wire, and the through hole is also a long hole extending over the side surface of the wire barrel so that the protrusions can be inserted from above and below the electric wire. You may do it. Furthermore, the same effect can be obtained when the crimp terminal is used not only for the enamel wire but also for a general electric wire with the coating of the tip portion peeled off, and such a structure can also be applied to an electric wire connecting tool. The through hole and the edge of the wire barrel and the bending structure of the wire barrel are effective if they are carried out at the same time, but the desired effects can be obtained even if they are carried out independently depending on the application.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged view of the crimp terminal 1, and FIG.
FIG. 3 is a partial explanatory view showing a situation in which the electric wire 2 is crimped onto the crimp terminal 1, and FIG. 3 is a sectional view taken along the arrow a in FIG. At the tip of the wire barrel 3 for crimping the electric wire 2, to the crimp terminal 1,
A mounting hole 4 for screwing the terminal board or the like with a screw or the like is formed. For example, two through holes 5 are formed in the wire barrel 3 on the same center line, and the edge portions of each through hole 5 project upward to form an annular edge 6. In order to form such an edge 6, first, a through hole 5 is formed by a usual drilling method using a die and a punch (not shown), and then, as shown in FIG. A die 7 having a hole diameter and a hammer 8 having a diameter slightly larger than the diameter of the through hole 5 are used, and the hammer 8 is press-fitted from the sagging side of the through hole 5. Further, both ends in the width direction of the wire barrel 3 are bent and inclined in the direction of the edge 6 as shown in FIG.

To crimp an electric wire 2 such as an enamel wire to the crimp terminal 1, as shown in FIG. 2 (A), a blade die 91 having a linear round groove of a crimping machine 9 and an anvil 92 having a dish-shaped upper surface. Press with and press-fit as shown in FIG. By doing so, as shown in FIG. 3, the edge 6 breaks the surface coating of the electric wire 2, that is, the enamel coating of the enamel wire, and bites into the electric wire 2, and conductivity can be secured at this biting portion, and at the same time, the tensile strength of the electric wire 2 increases. Reserved. At this time, since the surface of the electric wire 2 is escaped into the through hole 5, the electric wire 2 of the edge 6
It becomes easy to bite into. Further, since the wire barrel 3 is bent and inclined in the direction of the edge 6, the electric wire 2 is positioned at the center in the longitudinal direction when being pressed by the blade die 91, and the edge 6 should bite into the electric wire 2 uniformly. You can

Although the example of one electric wire has been described above, the present invention can be similarly used for connecting a plurality of electric wires 2. Also,
In order to position the electric wire 2 when it is applied to the edge 6, the edge 6 is not formed at the portion to which the electric wire 2 is applied, but it is formed into a recessed shape and the edge 6 is formed only on both sides of the electric wire 2. The positioning of the electric wire 2 is ensured before the operation. In this case, the outer diameter of the seam 8 may be reduced at the portion where the edge 6 is not formed.

[0013]

As described above, when the crimp terminal of the present invention is used, when the wire is crimped, the edge of the wire barrel breaks the insulating coating of the wire, such as enamel, and bites into the wire. , Mechanically fully connected. Therefore, it is not necessary to peel off the enamel in advance, a complicated device is not required, and workability can be significantly improved.

If both ends of the crimp terminal in the width direction of the wire barrel are bent and inclined in the direction of crimping the wire, the wire is positioned at the center of the wire barrel when crimping the wire and is not displaced. Fully crimped on the edge.

Further, according to this crimp terminal, not only the enameled wire but also a general electric wire whose coating is stripped off at the tip end portion can secure reliable conductivity and sufficient tensile strength. In addition, such a structure can be applied to a connecting tool for electric wires, and has a practically remarkable effect.

[Brief description of drawings]

FIG. 1 shows a crimp terminal of the present invention, (A) is a plan view,
(B) is a front view.

FIG. 2 shows a situation in which an electric wire is crimped to a crimp terminal, (A)
FIG. 3B is a front view before pressure bonding, and FIG.

3 is an enlarged sectional view of a part in the direction of arrow a in FIG.

FIG. 4 is an enlarged cross-sectional view of a step of forming an edge on an edge of a through hole.

FIG. 5 shows a conventional terminal component, (A) is a perspective view of the terminal component, (B) is an explanatory view of a conventional crimping mechanism, and (C) is a front view showing a state in which an electric wire is crimped to the conventional terminal component. It is a figure.

FIG. 6 is a perspective view of a conventional connector.

[Explanation of symbols]

 1 Crimping terminal 2 Electric wire 3 Wire barrel 4 Mounting hole 5 Through hole 6 Edge 7 Die 8 Shigoki 9 Crimping machine

Claims (2)

[Claims] 1. A wire barrel for crimping a tip of an electric wire is provided with at least one through hole at a central portion thereof, and an edge portion of the through hole projects in a crimping direction of the electric wire to form an edge. A crimp terminal for electric wires, which is characterized in that 2. The crimp terminal for an electric wire according to claim 1, wherein both ends in the width direction of the wire barrel for crimping the tip of the electric wire are bent and inclined in a direction for crimping the electric wire.