JPH06150987A - Pressure contact terminal and connecting method for covered electric wire using pressure contact terminal - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the mechanical strength of the insulation displacement terminal that holds the covered electric wire. [Constitution] Coated electric wire (15) press-fitted into the press contact blade (4)
An insulation barrel (5) capable of bending and fixing and holding the electric wire on the bottom side (3b) at a position corresponding to the front end (15a) ahead of the press contact blade of the electric wire.
And the front end of the covered electric wire is approximately 1
A locking portion (7) is provided that is folded back by 80 degrees and locked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-welded terminal capable of press-fitting a coated wire coated with an insulating material such as synthetic resin into a pressure-contact blade to make a conductive connection, and a method of connecting a coated wire using the terminal. .

[0002]

2. Description of the Related Art Conventionally, there are various types of connectors used in, for example, automobile electric wires (wire harnesses) and various other fields, and various connection terminals are used for these connectors and the like. There are various types. This connection terminal is usually formed by cutting out a conductive metal plate. A pressure contact terminal with a pressure contact blade is often used, which can easily connect the terminal and the covered electric wire without stripping the covering of the electric wire.

As shown in FIG. 11, the press contact terminal 70 has a press contact blade 7 forming a slot 71 into which a covered electric wire 73 is press fitted.
2 and an electric wire connecting portion 70a in which an insulation barrel 78 of two arrays in which the electric wire covering 74 is crimped and wound from the outer periphery in order to fix the covered electric wire 73 in the slot 71 is erected from the bottom portion 76 and other terminals. There is one having a configuration including an electric connecting portion 70b for connection (actually disclosed in Japanese Utility Model Publication No. 4-151).
No. 60).

Then, the electric wire 73 is press-fitted into the press-contact blade 72 having the substantially U-shaped slot 71 opening upward, so that the cover 74 is cut and the press-contact blade 72 is connected to the electric wire 7.
The conductor portion 75 of No. 3 is brought into pressure contact with the conductor portion 75 to establish conduction. Here, the press-contact portion formed of the U-shaped slot 71 is
Since it has a drawback that it is structurally weak against the external force of pulling the electric wire generated in the direction indicated by the arrow P, a convex portion 79 is formed between the insulation barrels 78 at the rear of the press contact blades 72, and the barrels 78 are provided. By adopting a configuration in which the outer periphery of the electric wire coating 74 is crimped and the electric wire 73 is appropriately curved by the convex portion 79, the pull-out resistance of the electric wire 73 can be increased and it is possible to resist external force.

[0005]

However, in a wire harness or the like using the pressure contact terminal having the above-mentioned structure, for example, when a wire harness is actually installed in a vehicle, a large wire pulling external force is applied to the terminal and at the same time vibration during running is generated. Join,
These external forces acted on the electric wire bent by the insulation barrel and the convex portion by using the shoulder portion of the convex portion, particularly the shoulder portion toward the front (shown by a chain line F in the figure) as an edge. As a result, stress was applied to the electric wire, the edge bited into the coating, and the coating was peeled off. Once the edge stripped off the coating to make the wire thinner, the wire pulled out suddenly due to pulling stress, and moved backward. As a result, the press contact terminal substantially reduces the fixing force at the insulation barrel, which seriously affects the wire connection at the press contact blade.

The present invention has been made in view of the above circumstances, and eliminates the adverse effect of the shoulder portion on the front side of the convex portion that bends the covered electric wire for improving the electric wire holding force and removes the covered electric wire behind. It is an object of the present invention to provide a press contact terminal that can improve prevention. Another object of the present invention is to provide a method of connecting a covered electric wire using the pressure contact terminal having the above-mentioned structure, which can improve the mechanical strength.

[0007]

The above object of the present invention is to provide a bottom portion of an insulation barrel, which is formed behind a press-contact blade for press-fitting a coated electric wire and which holds the coated electric wire, in a raised-bottomed electric wire receiving convex portion. In the crimp terminal used,
A locking portion for holding the front end of the covered electric wire, which is raised and placed on the electric wire receiving convex portion, in a linear shape having substantially the same height, is provided at a bottom portion closer to the front side from the press contact blade. This is achieved by a pressure contact terminal characterized in that

Another object of the present invention is to provide a bottom portion of an insulation barrel, which is formed behind a press-contact blade for press-fitting a covered electric wire and holds the covered electric wire, on a raised-bottomed electric wire receiving convex portion. In the method for connecting the covered electric wire using a crimp terminal, the covered electric wire is placed on the electric wire receiving convex portion and is press-fitted into the press contact blade, and then held by the insulation barrel, and further forward from the press contact blade. A pressure contact terminal is provided, which is provided at a bottom portion near the front end of the covered electric wire and holds the front end of the covered electric wire in a straight line at substantially the same height and is crimped by being guided to a locking portion for locking by folding back. This is achieved by the method of connecting the covered electric wire.

[0009]

In the pressure contact terminal having the above structure, the shoulder portion of the electric wire receiving convex portion for bending the covered electric wire in the front portion does not act as an edge with respect to the covered electric wire, so that damage to the electric wire covering can be eliminated. That is, the pressure contact terminal is configured such that the front end of the covered electric wire, which is supported by the electric wire receiving convex portion so as to be lifted up, passing through the press contact blade is placed on the locking portion separated from the electric wire receiving convex portion, and the electric wire is substantially Since the shoulders on the front side of the wire receiving protrusions are supported in a straight line at the same height and are not bent, it is possible to avoid damage due to edges at the shoulders.

Further, in the pressure contact terminal, since the front end of the covered electric wire ahead of the pressure contact blade is bent so as to be folded back by about 180 degrees and locked to the locking portion, the front end is provided in a straight shape. The holding force can be improved as compared with the conventional structure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pressure contact terminal according to the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of a pressure contact terminal according to the present invention, FIG. 1 is a perspective view in which a part of the pressure contact terminal is broken, and FIG. 2 shows a covered electric wire connected to the pressure contact terminal. It is a perspective view showing a situation. Also, FIG.
FIG. 3 is a sectional view of a portion taken along the line AA of FIG. 2.

As shown in FIGS. 1 and 2, the pressure contact terminal 1 of the present invention is formed by cutting out a conductive metal plate in the same manner as in the conventional case, and an electric connection portion 2 for connecting to another terminal.
And the electric wire connecting portion 3 for connecting and locking the covered electric wire 15. The electric wire connecting portion 3 is formed behind the press contact blade 4 and the press contact blade 4 forming a slot 4a into which the covered electric wire 15 is press-fitted, and the covered electric wire 15 is elastically sandwiched from both sides in the slot. It is provided with an insulation barrel 5 that can be fixed. The insulation barrel 5 has an upper part of the side wall 3a folded back inward, and is bent so as to form a raised bottom part to form an electric wire receiving convex part 5a. Further, the rear end portion of the electric wire receiving convex portion 5a is provided on a tongue-shaped electric wire guide piece 5b that hangs down toward the bottom portion 3b. At the rear end of the insulation barrel 5, an electric wire crimping portion 6 for crimping and winding a covered electric wire having a structure similar to the conventional one is provided.

A characteristic feature of the present invention is that the bottom portion 3b is partially cut and raised so as to form an opening 7a in the electric wire connecting portion 3 which is located forward of the press contact blade 4, and the bottom portion 3b is cut and raised. A brim-shaped locking portion 7 is bent along the electrical connection portion 2 side. The engaging portion 7 is provided at a height such that the cut-and-raised surface 7b thereof substantially coincides with the wire receiving convex portion 5a. Further, at the position of the bottom portion 3b substantially corresponding to the protruding end of the locking portion 7, the bottom portion 3b is cut and raised so as to have an inclined surface 8a inclined toward the bottom portion 3b in the bending direction of the locking portion 7. A guide projection 8 is provided.

When the covered electric wire 15 is connected to the pressure contact terminal 1 as described above, the electric wire 15 is crimped by the electric wire crimping portion 6 as shown in FIGS. While standing up so that it is located on 5a,
By being held by the insulation barrel 5, it is pressed into the slot 4 a of the press contact blade 4.
Further, the electric wire 15 is arranged such that the front end 15a ahead of the press contact blade 4 is disposed on the cut-and-raised surface 7b of the locking portion 7, and
It is formed into a hook shape that is folded back approximately 180 degrees and is locked to the locking portion 7. When the electric wire 15 is placed on the locking portion 7, the electric wire 15 is supported in a linear shape having substantially the same height as the electric wire receiving convex portion 5a, whereby the front side of the electric wire receiving convex portion 5a is supported. Shoulders do not act as edges. still,
When the front end 15a of the electric wire 15 is bent, the electric wire 15 is pressed from above so as to collide with the inclined surface 8a of the guide projection 8, so that the inclined surface 8a is slidably contacted and folded back appropriately. You will be guided to the stop 7.

FIG. 4 is applied to the front end 15a of the electric wire 15 of the molding jig for connecting the crimp terminal 1 to the covered electric wire 15 so that the electric wire 15 is attached to the locking portion 7. It is a molding jig for locking. This jig 20
Is a fixed portion 21 on which the crimp terminal 1 is placed, and the fixed portion 2
The movable part 22 is lowered onto the press-contact terminal placed on the terminal 1. The fixing portion 21 is configured to have a substantially rectangular pedestal 21b on a flat mounting table 21a. On the other hand, the movable part 22 acts on the front end 15a of the covered electric wire 15 placed at a position apart from the pedestal 21b, and abuts on the outer peripheral surface of the front end 15a to hold it in a gripping state. Cylindrical first and second groove portions 22a and 22b,
It has an inclined wall 22c that acts to bend the front end 15a appropriately.

Next, the method of connecting the covered electric wires using this forming jig will be sequentially described with reference to FIGS. In each drawing, the crimp terminal 1 is arranged on the mounting table 21a such that the base 21b of the jig is inserted into the opening 7a. With respect to the press-contact terminal 1 arranged in this way, as shown in FIG. 5, the electric wire 15 is arranged so that the vicinity of the front end 15a is located on the pedestal 21b. In this state, when the movable portion 22 corresponding to the fixed portion 21 is lowered, the front end 15a is pressed downward while being guided into the first groove 22a of the movable portion 22. Further, as the movable portion 22 descends, as shown in FIG. 6, the second groove 22b comes into contact with the outer peripheral surface of the electric wire 15 at a position close to the pedestal 21b, and moves the electric wire 15 further downward. Press. Also, due to this lowering of the movable part 22, the electric wire 1
5 is disposed on the locking portion 7 and is bent at a substantially right angle with the protruding end of the locking portion 7 as a bending point, and at the same time, the first
Is released from the groove 22a. When the movable part 22 continues to move and is lowered to the position just before the final molding position where the movable part 22 is substantially in contact with the press contact terminal 1, the front end 15a of the electric wire 15 collides with the guide protrusion 8 as shown in FIG. Then, it abuts against the inclined wall 22a of the movable portion 22 and is pushed out. As a result, the front end 15a comes into sliding contact with the inclined surface 8a and is further bent around the protruding end of the locking portion 7. Finally, as shown in FIG. 8, when the movable part 22 is lowered to the final molding position, the covered wire 15 has its front end 15a folded back approximately 180 degrees and is provided by the locking part 7. In the state of being drawn into the pocket, it is crimped from above and is locked by the locking portion 7.

On the other hand, as is apparent from FIG. 8, the covered electric wire 15 has the pressing blade 4 on the rear side of the pedestal 21b.
Is located above the lead-in end of the slot 4a and above the wire receiving protrusion 5a of the insulation barrel 5. Then, the covered electric wire 15 is press-fitted into the press-contact blade 4, the insulation barrel 5 and the electric wire crimping portion 6
The fixing by means of is carried out by a molding jig having a structure similar to the conventional one.

That is, as shown in FIG. 9, this jig is a press-contact jig 3 for press-fitting the covered electric wire 15 into the slot 4a.
0, the electric wire receiving convex portion 5 of the insulation barrel 5
It is composed of a fixing jig 40 for molding the barrel for pressing the electric wire on a and holding the electric wire 15, and a crimping jig 50 for molding the electric wire crimping portion 6. Then, the jigs 30, 40 and 50 are moved downward toward the fixing portion 21 in an integrated state. As a result, the press-connecting jig 30 can press the electric wire 15 into the slot. Further, the fixing jig 40 brings the electric wire 15 into contact with the electric wire receiving convex portion 5a of the insulation barrel 5, and at the same time, as will be described later in detail, the insulation barrel 5 has an elastic force. The barrel 5 is formed so as to sandwich the electric wire 15 from both sides. Further, the crimping jig 50 crimps the electric wire crimping portion 6 which crimps and winds the electric wire 15 to bring the electric wire 15 into pressure contact with the bottom portion 3b.

By applying these jigs, the press contact terminal 1 is fixed to the electric wire crimping portion 6 by the electric wire 1 described above.
5 is raised along the electric wire guide piece 5b (see FIG. 1) at the rear shoulder of the electric wire receiving convex portion 5a and bent, and further fixed by the insulation barrel 5. The front end 15a is firmly held together with the engagement at the engagement portion 7, so that the electric wire can be completely prevented from coming out backward.

Although not shown in detail in the drawing, the pedestal 21b is retracted into the fixed portion 21 when the jigs 30, 40, 50 are operated. Therefore, for example, when the front end 15a is pressure-contacted as described in the description of FIG. 8, a bulge is formed on the electric wire 15 by the protrusion of the pedestal 21b, and this bulge is caused by the electric wire guide. It is absorbed by the bending of the electric wire 15 at the piece 5b. As a result, the electric wire 15 is prevented from moving rearward from the front end 15a due to the bending of the electric wire guide piece 5b, and can be prevented from being detached from the locking portion 7. And in such a combined state,
The electric wire 15 is disposed on the electric wire receiving convex portion 5a on the front side and is supported on the locking portion 7 in a linear shape having substantially the same height. The front shoulder of the wire receiving protrusion 5a does not act as an edge.

FIG. 10 shows the fixing jig 40.
The jig 40 has a molding surface 40a formed by cutting out in a substantially mountain shape.
And a pressing portion 40b hanging from the top of the mountain shape. Then, the jig 40 is lowered in the direction indicated by the arrow X so that the pressing portion 40b abuts and the electric wire 15 is inserted into the electric wire receiving convex portion 5a, and at the same time, the molding surface 40a causes the insulation. The side walls 3a on both sides forming the barrel 5 are slidably contacted to
Transform each other inward. Thereby, the electric wire 15
Is disposed on the electric wire receiving convex portion 5a, and is elastically clamped in the direction indicated by the arrow R by the insulation barrel 5 formed by bending the upper side of the side wall inward and fixedly held on the barrel 5.

In the crimp terminal 1, since the insulation barrel 5 has such an elastic portion and holds the electric wire 15, an external impact acting on the electric wire holding is applied to the elastic portion. Can be absorbed and alleviated by the bending, and therefore the electric wire fixing force can be improved as compared with the conventional crimp winding. In the connection method described above, the jig for forming the locking portion and the jig for fixing and holding the electric wire are described to work sequentially, but these jigs work substantially simultaneously to reduce the molding time. It is common to plan.

[0023]

As described above, according to the pressure contact terminal and the method for connecting a covered electric wire using the terminal according to the present invention, the pressure contact terminal is mounted on the wire receiving convex portion in order to increase the pull-out resistance. Since the bent electric wire is arranged on the locking portion provided on the front side of the electric wire and supported in a linear shape having substantially the same height as the electric wire receiving convex portion, the electric wire on the front side of the electric wire receiving convex portion is Since the shoulder portion does not act as an edge on the electric wire, damage to the electric wire coating by the edge can be prevented.

Further, since the locking portion of the press contact terminal locks the electric wire whose front end is bent, the pulling resistance of the electric wire can be particularly increased to improve the holding force. Furthermore, since the insulation barrel has an elastic force to fix and hold the electric wire, it is possible to enhance the impact resistance and improve the mechanical strength of the press contact terminal.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a pressure contact terminal according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing a state in which a covered electric wire is connected to the press contact terminal of FIG.

3 is a vertical cross-sectional view of the pressure contact terminal taken along the line AA of FIG.

FIG. 4 is a perspective view of a jig applied to the connection method of the present invention.

FIG. 5 is a view for explaining the connection method of the present invention and is a partial cross-sectional view showing an initial state in which the front end of the electric wire is locked by the locking portion.

FIG. 6 is a partial cross-sectional view in which the connection is further advanced from the state of FIG.

FIG. 7 is a partial cross-sectional view in which the connection is further advanced from the state of FIG.

FIG. 8 is a partial cross-sectional view showing a final state in which the connection is further advanced from the state of FIG. 7 and the front end of the electric wire is locked by the locking portion.

FIG. 9 includes a portion in which a covered electric wire is press-fitted into a press-contact blade,
It is a fragmentary sectional view explaining the connection method with a terminal.

10 is an enlarged perspective view of the fixing jig 40 shown in FIG.

FIG. 11 is a perspective view of a conventional pressure contact terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crimp terminal 2 Electric connection part 3 Electric wire connection part 4 Pressure contact blade 4a Slot 5 Insulation barrel 5a Electric wire receiving convex part 7 Locking part 8 Guide protrusion 8a Sloping surface 15 Coated electric wire 15a Front end 20, 30, 40, 50 Forming cure Tool 21 Fixed part 22 Movable part 40a Molding surface 40b Pressing part

Claims (2)

[Claims] 1. A crimp terminal formed at the rear of a press-contact blade for press-fitting a coated electric wire, wherein the bottom of an insulation barrel for holding the covered electric wire is provided on a raised-bottomed electric wire receiving convex portion, wherein the press-contacting is performed. At the bottom part closer to the front from the blade, there is provided a locking part for holding the front end of the covered electric wire which is raised and placed on the electric wire receiving convex part in a linear shape of substantially the same height. Characteristic pressure contact terminal. 2. The coated electric wire using a crimp terminal, which is formed behind a press-contact blade for press-fitting the coated electric wire, and in which a bottom portion of an insulation barrel for holding the coated electric wire is provided in a raised-bottomed electric wire receiving convex portion. In the connection method, the coated electric wire is placed on the electric wire receiving convex portion and is held by the insulation barrel after being press-fitted into the press-contact blade,
Further, the front end of the covered electric wire is held in a straight line at substantially the same height from the press contact blade, and the front end of the covered electric wire is guided and crimped to a locking portion which is folded and locked. Method for connecting covered electric wire using pressure contact terminal.