JPH06104020A - Crimping connection terminal - Google Patents

Abstract

PURPOSE:To widen the range of crimping size in which conductivity and tensile force of an electric wire are both good, and to improve the reliability of electric connection by providing an uneven part on the front end part of a wire barrel to be pressed to a conductor, and by having the front end part of the wire barrel bitten into the conductor at the time of crimping. CONSTITUTION:An uneven part is provided on a front end part 12a of a wire barrel 12 of a crimping terminal 11 to be connected to an electric wire 1, and when it is crimped on a core wire (conductor) 2, the front part 12a is made to be bitten into the core wire 2. Cleaning effect is enhanced at the contact part between the core wire 2 and the front end part 12a of the wire barrel 12, due to plastic deformation stream at the time of crimping and mechanical brushing. Clean contact between metals can thus be expected regardless of an oxide film of a material or dust, and high conductivity is thereby achieved. High electric wire tensile force is ensured due to the bitten part even when the crimping size is enlarged. Reliability in the electric connection is thus improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open barrel type crimp connection terminal crimped to an electric wire and used for electric wiring.

[0002]

2. Description of the Related Art FIG. 6 is a development view showing a conventional general crimp connection terminal, and FIG. 7 is an external view showing a state in which the crimp connection terminal of FIG. 6 is connected to an electric wire. In the figure, 1 is an electric wire, 2 is a core wire which is a conductor of the electric wire 1, 3 is a crimp connection terminal connected to the electric wire 1, 4 is a wire barrel formed on the crimp connection terminal 3 and crimped to the core wire 4, 4a is a wire It is the tip of the barrel 4.

Next, a method of crimping the wire barrel 4 to the core wire 2 will be described. Crimping is one of the electrical connection techniques for permanently connecting terminals and wire conductors by mechanically applying high pressure. Specifically, the core wire 2 is held in the wire barrel 4, a large compressive load is applied by a tool, and both are plastically deformed to form a crimping portion.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7, in which the wire barrel 4 surrounds the core wire 2, and the tip 4a of the wire barrel 4 extends into the core wire 2. The dimension h of the crimp portion in the height direction is called the crimp dimension, and the crimp portion is managed by setting the crimp dimension h. 9 is a cross-sectional view taken along the line IX-IX in FIG. 8, in which the core wire 2 is compressed in parallel by the tip portion 4a of the wire barrel 4.

Here, the performance to be secured by the crimping portion is the conductivity and the electric wire pulling force which is the tensile strength of the electric wire. These two performances have characteristics peculiar to the crimping dimension h. is there. FIG. 10 is a characteristic diagram thereof. When the crimping dimension h is small, the core wire 2 of the electric wire 1 and the wire barrel 4 are in close contact with each other, so that high conductivity 5a is obtained, but the core wire 2 is deformed too much. Since the electric wire is easily broken, the electric wire pulling force 6a is reduced. Further, if the crimping dimension h is too small, the cross-sectional area of the core wire 2 of the crimping portion becomes small, so that the conductivity 5a deteriorates.

On the contrary, when the crimping dimension h becomes large, the core wire 2
Since the contact pressure between the wire barrel 4 and the wire barrel 4 becomes low, the conductivity 5a becomes low. However, since the core wire 2 is not excessively deformed, a large wire pulling force 6a can be secured. Further, if the crimping dimension h is too large, the electric wire may come off, and the electric wire pulling force 6a may also decrease.

Therefore, in the conventional crimp connection terminal 3, the crimp dimension h is overlapped with the crimp dimension h range 7a in which high conductivity can be secured and the crimp dimension h range 8a in which a large electric wire pulling force can be secured. Is set. As a result, high conductivity and a large electric wire pulling force can be secured at the same time.

[0008]

In the conventional crimp connection terminal 3 having the above-described structure, the two crimping portions are required to have good two performances, namely, conductivity and electric wire pulling force. Since the range 9a of the crimping dimension h is narrow, it is very difficult to set the crimping dimension h, and in some cases, there is no choice but to crimp at the sacrifice of either conductivity or electric wire tensile force. There was a point.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and widens the range of the crimping dimension in which both the conductivity and the tensile force of the wire are good, and sets the crimping dimension. It is an object of the present invention to provide a crimp connection terminal that can facilitate the above-mentioned process and can improve the reliability of electrical connection by increasing the conductivity.

[0010]

The crimp connection terminal according to the present invention is such that the tip of the wire barrel pressed against the conductor is provided with irregularities.

[0011]

In the present invention, since the tip of the wire barrel is provided with irregularities, the conductor of the electric wire bites into the irregularities during crimping, and good conductivity is obtained.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a development view showing a crimp connection terminal according to an embodiment of the present invention, FIG. 2 is an external view showing a state in which the crimp connection terminal of FIG. 1 is connected to an electric wire, and FIG. 3 is taken along line III-III of FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and the electric wire 1 and its core wire 2 are the same as in the conventional example.

In the figure, 11 is a crimp connection terminal connected to the electric wire 1, and 12 is a core wire 2 formed on the crimp connection terminal 11.
The wire barrel crimped to the wire barrel 12a.
The tip portion 12a has an uneven shape.

When the crimp connection terminal 11 as described above is used, the wire barrel 12 is crimped onto the core wire 2 as in the conventional example, but at this time, the shape of the tip portion 12a of the wire barrel 12 is uneven. , The tip portion 12a bites into the core wire 2. That is, as shown in FIG.
The biting part 2a into the concave portion of a is generated (3 in this embodiment).
Location). For this reason, at the contact portion between the core wire 2 and the tip portion 12a of the wire barrel 12, the plastic deformation flow at the time of crimping and the cleaning effect by mechanical wiping are greater than before. As a result, clean metals can be expected to come into contact with each other regardless of the oxide film and dust of the material, higher conductivity can be obtained, and highly reliable electrical connection can be performed.

Further, such a biting portion 2a of the core wire 2
Can be obtained by slightly increasing the crimping dimension h. Therefore,
Even if the crimping dimension h becomes large, the biting portion 2a of the core wire 2 can secure a high electric wire pulling force.

Here, FIG. 5 is a characteristic diagram of conductivity and electric wire pulling force with respect to the crimping dimension h in the crimping connection terminal 11 of this embodiment. In the figure, 5b is conductive, 6b is electric wire pulling force, 7b is range of crimping dimension h with good conductivity, 8b
Is a crimping dimension h range in which the wire pulling force is good, and 9a is a crimping dimension h range in which both conductivity and wire pulling force are good.

As described above, the range of the crimping dimension h with good conductivity is widened from 7a in FIG. 10 to 7b in FIG. 5 for the reason described above. On the other hand, in the range of the crimping dimension h where the wire pulling force is good, 8a in FIG. 10 to 8 in FIG.
Widen to b. Therefore, the range of the crimping dimension h in which both the conductivity and the tensile force of the wire are good is 9a in FIG. 10 to 9 in FIG.
It becomes wider to b, and it becomes easy to set the crimping dimension h.

In the above embodiment, an example of a male crimp connection terminal for a connector is shown, but the present invention is not limited to this. In the present invention, the wire barrel has a crimp connection terminal other than a tubular shape, that is, an open barrel crimp connection terminal. Applicable to all connection terminals.

Further, in the above-mentioned embodiment, the concave and convex portions of the tip portion 12a of the wire barrel 12 are shown to have three grooves, but the number of grooves may be increased from one to an arbitrary number.
The cross-sectional shape of the groove is not limited to a quadrangle, and may be, for example, a triangle or an arc. Further, projections may be added instead of grooves to form irregularities, and the shape and number of projections in this case are not particularly limited. Furthermore, in the above-mentioned embodiment, the concavities and convexities are formed symmetrically at the two tip portions 12a of the wire barrel 12, but they may be asymmetric.

[0020]

As described above, in the crimp connection terminal of the present invention, since the tip end portion of the wire barrel pressed against the conductor is provided with irregularities, the tip portion bites into the conductor, and as a result, the conductivity and the wire tension are pulled. It is possible to widen the range of crimp dimensions that are both good in force and to facilitate the setting of crimp dimensions, and to increase the conductivity to improve the reliability of electrical connection. Produce an effect.

[Brief description of drawings]

FIG. 1 is a development view showing a crimp connection terminal according to an embodiment of the present invention.

FIG. 2 is an external view showing a state in which the crimp connection terminal of FIG. 1 is connected to an electric wire.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a characteristic diagram showing the characteristics of conductivity and electric wire pulling force with respect to the crimping dimension of the crimping connection terminal of FIG.

FIG. 6 is a development view showing an example of a conventional crimp connection terminal.

FIG. 7 is an external view showing a state in which the crimp connection terminal of FIG. 6 is connected to an electric wire.

8 is a cross-sectional view taken along the line VIII-VIII of FIG.

9 is a sectional view taken along line IX-IX in FIG.

10 is a characteristic diagram showing the characteristics of conductivity and electric wire pulling force with respect to the crimp dimension of the crimp connection terminal of FIG. 7.

[Explanation of symbols]

 1 Electric Wire 2 Core Wire (Conductor) 11 Crimp Connection Terminal 12 Wire Barrel 12a Tip

Claims (1)

[Claims] 1. An open barrel type crimp connection terminal which is electrically and mechanically permanently connected to a conductor of an electric wire by crimping the wire barrel to the conductor of an electric wire, wherein the tip of the wire barrel is pressed against the conductor. A crimp connection terminal characterized by being provided with irregularities.