JPH06267596A - Crimp metal fitting for electric wire - Google Patents

Abstract

PURPOSE:To reduce contact resistance without inviting the decrease in fastening force by integrally forming a crimp part to be applied crimp only and a crimp part to be crimped and then welded with a metal fitting base. CONSTITUTION:A crimp metal fitting 20 is integrally formed of crimp segments 22 at both ends located at the front and the back of a metal fitting base 21 and a crimp segment 24 at the central part. In connecting electrical wires 26a-26c, core parts 27a-27c are interposed on the metal fitting 20 at its upper side. The crimp parts 23a, 23b, 25 of the crimp segments 22, 24 are bent and deformed by means of a crimp tool for crimping to each core part 27a-27c. Welding is then applied to a crimp part 25 only by means of resistance welding device or an ultrasonic welding device. Thus, damage to the electrical wires due to welding is limited to the position of the crimp part 25 to reduce contact resistance while retaining sufficient fastening force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire crimp fitting used for joining electric wires between electric wires or between electric wires and terminals of a wire harness for automobiles and the like.

[0002]

2. Description of the Related Art Conventionally, in a wire harness of a moving body such as an automobile, a ship, an airplane or the like, or an industrial machine, when joining electric wires or electric wires or terminals to each other, mechanical crimping of crimp metal fittings is generally performed. And is crimped as shown in FIG. 7, for example.

That is, as shown in FIG.
The crimping metal fitting 3 used for joining the metal plates has a substantially U-shaped cross section, and one end of each of the plurality of metal fittings 3 is integrally connected to the long feed plate 4 at regular intervals. Is moved in one direction by a moving means (not shown), and the respective metal fittings 3 are sequentially conveyed to the position of the pressure device described later.

At this time, the feed plate 4 is provided with the feed holes 5 at the same pitch as the intervals of the metal fittings 3, and the metal fittings 3 are detected based on the positions of the feed holes 5.

Further, each metal fitting 3 is adapted to be pressure-bonded as described later and, at the same time, separated from the feed plate 4.

Next, the pressurizing device will be described. As shown in FIG. 7, it comprises an anvil 11 and a crimper 12. The anvil 11 is fixed at a predetermined position, and its upper surface 13 is fixed.
Has a slightly concave curved surface, the metal fitting 3 is placed on the upper surface 13 of the anvil 11, and the exposed core portions of the electric wires 1 and 2 are arranged inside the metal fitting 3.

The crimper 12 is arranged above the anvil 11 so as to be movable up and down, and a depression 14 for pressurization is formed on the lower surface. The metal fitting 3 deformed by the pressure of the crimper 12 is guided into the depression 14. A pair of concave curved surfaces 14a and a convex portion 14b located at the confluence of the both concave curved surfaces 14a and protruding toward the anvil 11 are formed.
The lower part of the is expanded outward so that the metal fitting 3 can be easily guided.

The crimper 12 is moved up and down by a hydraulic cylinder (not shown).

When the metal plate 3 is conveyed onto the anvil 11 by the movement of the feed plate 4, the cores of the electric wires 1 and 2 are arranged inside the metal plate 3, and the crimper 12 moves downward to move the metal plate 3 Is pressed and deformed by the anvil 11 and the crimper 12, and the metal fitting 3 is crimped to the core wires of the electric wires 1 and 2,
The metal fitting 3 is cut and separated from the feed plate 4.

By the way, in the case of such mechanical crimping, a high fixing force can be obtained, but the electrical contact resistance of the joining portion becomes large. Therefore, in order to reduce the contact resistance, the joining portion after mechanical crimping is heat-welded or other resistance is applied. Welding or ultrasonic welding is considered, and this heat welding is performed as shown in FIG. 8, for example.

That is, as shown in FIG. 8, a lower electrode 15 and an upper electrode 16 having the same shapes as the anvil 11 and the crimper 12, respectively, are provided, and the upper electrode 16 moves up and down by a hydraulic cylinder or the like like the crimper 12. The metal fitting 3 after pressure bonding is placed on the lower electrode 15 and then the upper electrode 16 moves downward, and the metal fitting 3 is held in a state of being pressed by both electrodes 15, 16. A DC power supply 17 for heat welding connected to both electrodes 15, 16 is used for both electrodes 15, 1.
An electric current is passed between 6 and the joint portions of the electric wires 1 and 2 are heat-welded by the heat generation of the electrodes 15 and 16 to reduce the contact resistance.

In addition to the above-mentioned heat welding, it is also considered that the contact resistance of the joint portion between the electric wires 1 and 2 is achieved by known resistance welding or ultrasonic welding.

[0013]

However, when welding or the like is performed after the mechanical crimping as described above, the contact resistance of the joint portion of the two electric wires 1 and 2 is lower than that in the case of only the mechanical crimping, but the heat or There is a problem that the electric wire is damaged by the vibration, the electric strength of the electric wire is deteriorated, and the fixing force of the joint portion between the electric wires 1 and 2 is reduced.

A similar problem also occurs in joining the wire and the terminal.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a wire crimping metal fitting capable of reducing the contact resistance without lowering the fixing force.

[0016]

A wire crimping metal fitting according to the present invention is an electric wire crimping metal fitting, in which resin of an electric wire is peeled off and crimped to an exposed core wire portion and then welded. A base and a first crimp portion that is crimped to the core wire portion by bending the two crimp pieces by integrally bending the pair of crimp pieces on a part of the base; It is characterized by comprising a pair of crimping pieces integrally formed on the portion, and a second crimping portion which is crimped to the core wire portion by bending of these crimping pieces and then welded.

[0017]

According to the present invention, the first crimping portion, which is only crimped, and the second crimping portion, which is welded after crimping, are integrally formed on the metal fitting base.
The contact resistance can be reduced by welding at the second crimping portion while maintaining a predetermined fixing force by the first crimping portion only at the position of the crimping portion.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of an embodiment of a crimp fitting for electric wires according to the present invention, FIG. 2 is a perspective view in a crimped state, FIG. 3 is a side view in which a part of FIG. 2 is cut, FIG. 5 is an operation explanatory diagram, FIG.
[Fig. 6] is a plan view of another embodiment.

As shown in FIG. 1, the crimping metal fitting 20 comprises a long metal fitting base 21 and crimping pieces 22 integrally formed in pairs at both front and rear ends of the base 21. The first crimping portion 2 that is crimped to the exposed core wire portion by stripping the insulating coating resin of a plurality of electric wires by bending the piece 22
3a and 23b, and a pair of crimping pieces 24 integrally formed in substantially the central portion of the base body 21. The second crimping pieces 24 are crimped to the above-described core wire portion by bending and then welded. It is constituted by the crimping portion 25.

Then, as shown in FIGS. 2 and 3, when the three electric wires 26a, 26b and 26c are joined, the insulating coating resin at the ends of the electric wires 26a to 26c is peeled off and exposed. Core wire portions 27a, 27b, 27c are crimp fittings 20
Of the anvil and crimper shown in FIG. 7, the crimping device having the same configuration as the crimping device 20 shown in FIG. The core portions 27a to 27c are crimped.

After that, the second crimping portion 25 of the metal fitting 20 is crimped by the resistance welding device or the ultrasonic welding device.
Welding is applied only to each wire 2 by crimp fitting 3
The joining of 6a to 26c is completed.

The electric wires 26a to 26 joined in this way
Comparing the fixing force and contact resistance of c with the case where only the metal fitting 3 is crimped as shown in FIG. 7 and when the metal fitting 3 is crimped with welding as shown in FIG. The results shown in are obtained. Here, the wire size is 0.5 mm
3 of ² are used, and ○ mark in Fig. 4 and Fig. 5 shows this embodiment, △ mark indicates the case of crimping only (conventional), □ mark indicates the case of welding the crimping (conventional). Shown respectively.

As is clear from the results of the fixing force shown in FIG. 4, in the case of this embodiment, a higher fixing force can be obtained as compared with the case where welding is added to the crimping, although it is not sufficient in the case of only crimping. As is clear from the results of the contact resistance shown in FIG. 5, in the case of the present embodiment, the contact resistance is almost the same as that when welding is added to the crimping, which is almost 1 in comparison with the case where only crimping is performed.
An order of magnitude lower resistance is obtained.

This is the second crimp portion 25 of the crimp fitting 20.
By welding only on the
The contact resistance is limited to the vicinity of the crimping portion 25, and the contact resistance can be reduced without significantly lowering the fixing force.
This is because 3b can provide a sufficient fixing force.

Therefore, according to the above embodiment, it is possible to reduce the contact resistance while maintaining a sufficient fixing force when joining the plurality of electric wires 26a to 26c.

The number of electric wires to be joined is not limited to the above three, but the same effect can be obtained even if the number of electric wires is two or four or more.

FIG. 6 is a plan view of another embodiment,
This is an example applied when joining an electric wire and a terminal.

As shown in FIG. 6, the metal fitting base 2 shown in FIG.
A pair of resin gripping pieces 31 for gripping the resin at the stripping end of the electric wire by bending deformation are integrally formed at the front end of the base wire 1, and a terminal 32 is integrally formed at the rear end of the base body 21 to form a crimp fitting 33. Is configured.

Therefore, according to the crimp fitting 33, it is possible to reduce the contact resistance while maintaining a sufficient fixing force when joining the electric wire and the terminal.

In both of the above embodiments, the case where two first crimp portions are formed has been described, but the number of the first crimp portions may be one or three or more, and the number of the second crimp portions is two or more. Of course, it is okay.

[0031]

As described above, according to the electric wire crimping fitting of the present invention, the first crimping portion that is only crimped and the second crimping portion that is welded after crimping are integrally formed on the fitting base. By forming the wire, damage to the electric wire due to welding is limited to the position of the second crimping portion, so that when the electric wire and the terminal are joined, the contact resistance can be reduced while maintaining a sufficient fixing force. Energy loss due to heat generation can be prevented in a power supply circuit or the like, and deterioration of signal characteristics can be prevented or reduced in a low-voltage low-current circuit such as a sensor.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of an electric wire crimping fitting of the present invention.

FIG. 2 is a perspective view showing a state in which the metal fitting of FIG. 1 is crimped.

FIG. 3 is a side view in which a part of FIG. 2 is cut.

FIG. 4 is an operation explanatory diagram of FIG. 1.

5 is an operation explanatory diagram of FIG. 1. FIG.

FIG. 6 is a plan view of another embodiment of the present invention.

FIG. 7 is an explanatory diagram of a conventional example.

FIG. 8 is an explanatory diagram of another conventional example.

[Explanation of symbols]

 21 metal fitting base 22,24 crimping piece 23a, 23b first crimping section 25 second crimping section 26a, 26b, 26c electric wire 27a, 27b, 27c core section

Claims (1)

[Claims] 1. A crimp metal fitting for an electric wire, which is formed by stripping resin of an electric wire and crimping to an exposed core wire portion, and then welding, which is formed integrally with a long metal fitting base and a part of the base. A pair of crimping pieces, the first crimping portion being crimped to the core wire portion by bending both of these crimping pieces, and a pair of crimping pieces integrally formed on the other part of the base. A crimp metal fitting for an electric wire, comprising: a second crimp portion which is crimped to the core wire portion by bending the both crimping pieces and then welded.