JP2003007361A - Crimp terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crimp terminal that can firmly units a wire having a core in a conductor with a large retaining force. SOLUTION: The crimp terminal firmly unites the wire 10A, in which a conductor 11 is arranged in the circumference of the core of the wire 10A and a shell 12 is arranged on the outer circumference of the conductor. A clump part 220 is formed in the order of a core caulking part 221, a conductor caulking part 222 and a skin caulking part 223 from the side close to an electric junction part 210 in the crimp terminal 200. Thus, a large retaining force is given by the crimping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimp terminal useful for crimping an electric wire in which a core material is placed in a conductor.

[0002]

2. Description of the Related Art Conventionally, various types of crimp terminals for electric wires have been proposed. For example, FIGS.
The crimp terminal 100 shown in FIG. 3 is manufactured from a thin metal plate such as copper or copper alloy, and has a substantially U-shaped groove-shaped crimp portion 120 provided from the base of the electrical connection portion 110 having a ring shape or the like. The crimping portion 120 includes a conductor crimping portion 1 including two crimping pieces 121 a and 121 a on the left and right sides from the electric connection portion 110 side.
21 and the left and right caulking pieces 122a, 122a are formed in this order.

After the electric wire 10 is exposed, first, the conductor 11 portion is crimped to the conductor crimping portion 121.
It is fitted between 21a and 121a and has an outer cover (cover) 1
2 parts are caulking pieces 122a, 1 of the outer caulking portion 122.
It fits in between 22a. Next, each crimping piece is squeezed in sequence and crimped.

As a result, the electric wire 10 can be electrically connected by crimping the conductor 11 portion, and at the same time, can be mechanically firmly fixed by crimping the conductor 11 portion and the outer skin 12 portion.

[0005]

However, in the case of an electric wire in which a core material is put in a conductor and the electric wire itself is extremely thin, when observed carefully, the electric wire is It was found that even if pressure was applied at two points on the outer skin, it was still insufficient.

[0006] For example, in the case of an electric wire with a core material used in a wire harness for automobiles, the thickness is 0.18 mm.
Around the middle core material [high tension material (tension member), usually stainless steel wire etc.], stranded a conductor (using fine copper wire etc., usually 6) of approximately the same diameter, and lay it on this conductor Although the outer cover is applied, the total outer diameter including this outer cover is at most about 1.2 mm.

In the electric wire having such a structure, the conductor is
When crimping with the crimping piece of the conductor crimping part, the inner core material has high strength, but since the copper thin wire of the conductor surrounding it is a relatively soft material, it is easily crushed and sufficient clamping force Was difficult to obtain. However, if the caulking piece is crushed with an excessively strong force, the copper thin wire of the conductor may be excessively deformed or broken, which may cause a problem in electrical connection.

The present invention has been made in view of the above situation. That is, in the crimp terminal of the present invention, basically, in addition to the conductor crimping portion and the outer crimping portion, the core crimping portion is provided in the crimping portion to ensure a more stable crimping force (clamping force). It is the one.

[0009]

The present invention according to claim 1 is a crimp terminal in which a conductor is arranged around a core material and an electric wire having an outer skin is crimped to the outer periphery of the conductor. Then, the crimping portion is formed by forming the crimping portion of the core material, the crimping portion of the conductor, the crimping portion of the conductor, and the crimping portion of the outer cover in this order from the side closer to the electrical connection portion.

According to a second aspect of the present invention, the central core material caulking portion and the conductor caulking portion are integrated, and at the time of caulking, the central core material caulking portion is crushed more largely than the conductor caulking portion. The crimp terminal according to claim 1, wherein:

According to a third aspect of the present invention, a cut is formed at the boundary between the caulked portion of the core material and the caulked portion of the conductor, and at the time of caulking, the caulked portion of the core material is more crushed than the caulked portion of the conductor. The crimp terminal according to claim 1, wherein the crimp terminal is crimped.

The present invention according to claim 4 is the crimp terminal according to claim 1, 2 or 3, wherein the caulking portion of the core material is caulked together with the core material of the electric wire and the conductor.

According to a fifth aspect of the present invention, there is provided a crimp terminal according to the first, second or third aspect, in which only the core material of the electric wire is caulked to the caulking portion of the core material.

[0014]

FIG. 1 shows an example of a crimp terminal according to the present invention. This crimp terminal 200A includes a crimp portion 220 extending from a male type electrical connection portion (tab) 210.
However, it has a substantially U-shaped groove shape (other shapes are also possible), and the central core material caulking portion 221 and the conductor caulking portion 222 are integrally formed from the side closer to the electrical connection portion, and subsequently, The outer skin caulking portion 223 is formed. of course,
The terminal material is a thin metal plate such as copper or copper alloy.

Each of the caulking portions 221 to 223 is a pair of left and right caulking pieces 221a, 221 and 222, respectively.
a, 222a, 223a, 223a. here,
The height of each caulking piece 223a, 223a of the outer caulking portion 223 is higher than that of each caulking piece 221a, 222a, 223a of the center core material caulking portion 221 and the conductor caulking portion 222.
It is formed higher. These are adapted to the outer diameters of the conductor portion and the outer skin portion of the corresponding electric wires. Further, as a preferable shape, each of the pair of left and right caulking pieces is formed in a substantially U-shaped groove shape, but the invention is not limited to this and may be a square groove shape or the like. It is also possible to appropriately adjust the groove width, for example, the groove of the outer skin portion is wide and the groove of the conductor portion is narrow according to the corresponding portion of the electric wire.

FIG. 2 shows another example of the crimp terminal according to the present invention. This crimp terminal 200B is basically also composed of:
It is almost the same as that of FIG.
A cut 224 is formed at the boundary between the conductor 21 and the conductor caulking portion 222.

Crimping terminal 200 having such a structure
According to A, 200B, in the form as shown in FIGS.
The target electric wire 10A can be crimped. In this crimping, as shown in FIG.
Only 2 is stripped off, and the core material 13 [high tension material (tension member), usually stainless steel wire etc.] and the conductor of almost the same diameter (use copper thin wire etc., usually 6) 11 Cut together. This finding has the advantage of being extremely easy to perform. Here, the outer diameter of the core material is 0.18.
mm, the outer diameter of the entire conductor portion is about 0.54 mm, and the total outer diameter of the electric wire is about 1.2 mm.

Then, the core portion 13 of the electric wire 10A and the conductor portion of the conductor 11 which are cut together are fitted into the core portion caulking portion 221 and the conductor caulking portion 222 of each terminal,
The outer skin 12 portion is fitted into the outer skin crimp portion 223. After that, the respective caulking pieces 221a, 222a, 223a are crushed to crimp the corresponding portions of the electric wire 10A.

At this time, the crushing amount (size) of the conductor crimping portion 222 is set within a range such that the conductor 11 portion is not excessively deformed or broken. This provides good electrical connection. Further, since excessive weight is not applied to the conductor 11 portion, stable connection can be obtained over time.

On the other hand, in the center core material caulked portion 221,
Compared with the conductor crimped portion 222, the conductor is crimped and pressed. Thereby, a larger fixing force can be obtained for the core material 13. In other words, the core material 13 itself is made of a high-strength material and can withstand stronger stress. as a result,
A greater clamping force can be obtained for the electric wire 10A. Even if the conductor 11 portion is excessively stressed by the large crimping, a good electrical connection is secured by the crimping of the conductor caulking portion 222 as described above. It never becomes.

Further, in FIG. 3, the crimp terminal 200A is used, and the diameter of the core crimping portion 221 is continuously reduced from the end of the conductor crimping portion 222. In FIG. 4, the crimping terminal 200B is used. Since the cut 224 is formed at the boundary portion between the conductor crimped portion 222 and the core crimped portion 221, the core crimped portion 221 can be crimped independently of the conductor crimped portion 222. As a result, a smoother crimping of the caulked portion 221 of the core material becomes possible.

FIG. 6 shows another example of how the electric wire 10A is exposed. In this case, the outer core 12 of the electric wire 10A is stripped off, and at the same time, the conductor 11 is stripped off from the core 13 to extend the core 13. Even with the electric wire 10A thus exposed, it is possible to crimp it to the crimp terminals 200A and 200B, in substantially the same manner as in FIGS. 3 to 4. In this mode, the electric wire is slightly troublesome to expose, but it is possible to reliably fix the core material 13 portion. That is, the core material 13 made of a high tensile strength material is directly and firmly pressure-bonded to the terminal side member without the conductor 11 made of a soft copper thin wire being interposed. If the groove space of the caulked portion is larger than the outer diameter of the core 13, the core 13 may be partially folded back or another suitable spacer piece may be inserted to fill the groove space. Good.

In the above embodiment, the caulking part 221 and the caulking part 222 of the conductor are formed by the integrated caulking pieces of the same height in order to facilitate manufacture. The invention is not limited to this, and makes them independent,
Also, their heights can be different. In addition, the crimp terminals 200A and 200B of the above embodiment
In the above, the tab shape of the electrical connection portion 210 is a male shape, but the present invention is not particularly limited to this. For example, it may have a ring shape as shown in FIG. 7, a tubular shape, a box shape, or the like.

[0024]

As is apparent from the above description, according to the crimp terminal of the present invention, since the crimping portion is at three places, a large clamping force can be obtained. In particular, in the case of an electric wire with a core material used for a wire harness for automobiles, the outer diameter of the core material is about 0.18 mm and the total outer diameter including the outer cover is 1.2.
Even with a diameter of about mm, the core material made of a high-strength material is firmly pressure-bonded by the caulking piece of the caulking portion of the core material, so that a large gripping force which has never been obtained can be obtained. By the way, as a result of a test conducted by the present inventor, it was found that the tensile strength was improved by about 30% as compared with a structure having the same structure but without the caulking portion of the core material. In addition, the amount of pressure that can be strongly applied to the core material side,
Since the crimping on the conductor side may be relatively small, deformation or breakage of the conductor portion can be prevented, and stable and highly reliable electrical connection can be obtained for a long period of time. In other words, it is not necessary to squeeze and crimp a conductor portion that is relatively soft and has low strength more than necessary, so that the conductor portion can be protected.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing another embodiment of the crimp terminal according to the present invention.

3 is a perspective view showing a state in which an electric wire is crimped by the crimp terminal of FIG.

FIG. 4 is a perspective view showing a state in which an electric wire is crimped by the crimp terminal of FIG.

FIG. 5 is a perspective view showing an example of an outlet of an electric wire crimped by a crimp terminal according to the present invention.

FIG. 6 is a perspective view showing another example of exposing the electric wire crimped by the crimp terminal according to the present invention.

FIG. 7 is a perspective view showing a conventional crimp terminal.

FIG. 8 is a perspective view showing a state in which an electric wire is crimped by a conventional crimp terminal.

[Explanation of symbols]

10A electric wire 11 conductor wire 12 outer skin 13 Core material 200A, 200B Crimp terminal 210 Electrical connection 220 Crimp part 221 Medium core material caulked part 222 Conductor caulking part 223 Caulking section 221a to 223a Caulking piece

Claims (5)

[Claims] 1. A conductor is arranged around a core material, and
A crimp terminal for crimping an electric wire with an outer cover on the outer periphery of the conductor, wherein the crimping part is formed in the order of a core material caulking part, a conductor caulking part, and an outer skin caulking part from the electric connection part side. Crimp terminal characterized in that 2. The central core material caulked portion and the conductor caulked portion are integrated, and at the time of caulking, the central core material caulked portion is more largely crushed than the conductor caulked portion and is caulked. Crimp terminal according to 1. 3. A cut is formed at a boundary between the caulked portion of the core material and the caulked portion of the conductor, and at the time of caulking, the caulked portion of the core material is more largely crushed than the conductor caulked portion and caulked. The crimp terminal according to claim 1. 4. The crimp terminal according to claim 1, wherein the caulking portion of the core material is caulked together with the core material of the electric wire and the conductor. 5. The crimp terminal according to claim 1, wherein only the core material of the electric wire is caulked to the caulking portion of the core material.