JP2700747B2 - IDT terminal and method of connecting insulated wire using the terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press contact terminal capable of press-fitting a covered electric wire covered with an insulating material such as a synthetic resin into a press contact blade for conducting connection and a method of connecting a covered electric wire using the terminal. .

[0002]

2. Description of the Related Art Conventionally, there have been various types of connectors used in, for example, automobile electric wires (wire harnesses) and other various fields, and various connection terminals have been used for such connectors. There are different types. This connection terminal is usually formed by cutting out a conductive metal plate. A press-connecting terminal with a press-connecting blade, which can be easily connected without stripping the coating of the wire when connecting the terminal and the coated wire, is often used.

As shown in FIG. 11, the press contact terminal 70 has a press contact blade 7 forming a slot 71 for press-fitting a covered electric wire 73.
2 and an electric wire connecting portion 70a in which an insulation barrel 78 of two arrangements for crimping and winding an electric wire covering 74 from the outer periphery to fix the covered electric wire 73 in the slot 71 is raised from a bottom portion 76 to another terminal. There is a configuration having an electrical connection portion 70b for connection (Japanese Utility Model Laid-Open No. 4-151).
No. 60).

[0004] Then, the electric wire 73 is press-fitted into a press-contact blade 72 having a substantially U-shaped slot 71 opened upward, thereby cutting the covering 74 to thereby make the press-contact blade 72 into the electric wire 7.
3 and is brought into contact with the conductor 75 by pressure. Here, the press-contact portion composed of the U-shaped slot 71 is shown in FIG.
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 projection 79 is formed between the insulation barrels 78 behind the press-contact blade 72, and the barrel 78 is used. By crimping the outer periphery of the electric wire covering 74 and appropriately bending the electric wire 73 by the convex portion 79, a configuration is adopted in which the withdrawal resistance of the electric wire 73 can be increased to counter external force.

[0005]

However, in a wire harness or the like using a press contact terminal having the above-described structure, for example, when a wire harness is installed in an actual vehicle, a large electric wire pulling force is applied to the terminal and vibrations during traveling are generated. Join
These external forces caused the shoulders of the projections, particularly the shoulders closer to the front (indicated by chain lines F in the figure) to act as edges on the electric wire curved by the insulation barrel and the projections. As a result, stress was applied to the electric wire, and the edge bitten into the coating, and the coating was peeled off. When the edge once peeled off the coating to make the wire thinner, the wire was slipped out at once by the pulling stress and moved backward. As a result, the pressure contact terminal substantially reduced the fixing force at the insulation barrel, and was seriously affected by the electric wire connection at the pressure contact blade.

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and eliminates the adverse effect of a shoulder on the forward side of a convex portion that curves an insulated wire by improving the wire holding force, thereby removing the insulated wire. It is an object of the present invention to provide a press contact terminal capable of improving prevention. Another object of the present invention is to provide a method for connecting a covered electric wire using the press contact terminal having the above-mentioned structure, which can improve mechanical strength.

[0007]

An object of the present invention is to provide an insulation barrel formed behind a press-contact blade for press-fitting an insulated wire and holding the insulated wire, wherein the bottom of the insulation barrel is provided on a raised bottom wire receiving convex portion. In the crimp terminal that is
The front end of the covered electric wire, which was raised and placed on the electric wire receiving convex portion, was held in a straight line having substantially the same height at the bottom portion closer to the front from the press contact blade, and the electric wire was folded back.
This is achieved by a press-contact terminal characterized in that a flange-shaped locking portion for locking in a state is provided.

Another object of the present invention is to form 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 bottom-shaped wire receiving convex portion. In the method of connecting the covered electric wire using the crimp terminal, the covered electric wire is placed on the convex portion of the electric wire receiving and pressed into the press contact blade, and then held by the insulation barrel. A press-connecting terminal is provided, which is provided at a lower bottom portion, guides and press-bonds a front end of the insulated wire in a straight line of substantially the same height, and guides and crimps the locking portion to be folded back and locked. This is achieved by a method of connecting a covered electric wire.

[0009]

In the pressure contact terminal having the above-described structure, the shoulder near the front of the wire receiving convex portion for bending the covered wire does not act as an edge with respect to the covered wire, so that damage to the wire covering can be eliminated. That is, the press-connecting terminal is placed on the engaging portion of the covered electric wire supported to be lifted by the wire receiving convex portion, the front end of the covered electric wire passing through the press-connecting blade being separated from the wire receiving convex portion, and the electric wire is substantially moved. Since the structure is supported in a straight line at the same height and is not bent at the shoulder on the front side of the wire receiving projection, damage due to the edge at the shoulder can be avoided.

[0010] Further, since the press-connecting terminal is bent so that the front end of the insulated wire ahead of the press-contact blade is turned substantially 180 degrees and is 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 having the conventional structure.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a press contact terminal according to the present invention. 1 to 3 show an embodiment of a press contact terminal according to the present invention. FIG. 1 is a perspective view in which a part of the press contact terminal is broken, and FIG. 2 shows a case where a covered electric wire is connected to the press contact terminal. It is a perspective view showing a situation. FIG.
FIG. 3 is a cross-sectional view of a portion taken along line AA of FIG. 2.

As shown in FIGS. 1 and 2, the press contact terminal 1 of the present invention is formed by cutting a conductive metal plate in the same manner as in the prior art, and is formed by an electric connection portion 2 connected to another terminal.
And an electric wire connection portion 3 for connecting and locking the covered electric wire 15. The wire connecting portion 3 is formed behind a press-contact blade 4 forming a slot 4a for press-fitting the insulated wire 15 and the press-contact blade 4, and has a resilient force to sandwich the insulated wire 15 from both sides. It comprises an insulation barrel 5 that can be fixed. The insulation barrel 5 has an upper portion of the side wall 3a turned inward and bent so as to form a raised bottom, thereby forming a wire receiving convex portion 5a. Further, the rearward end of the wire receiving convex portion 5a is provided on a tongue-shaped wire guide piece 5b hanging down toward the bottom 3b. At the rear end of the insulation barrel 5, there is provided an electric wire crimping portion 6 having the same structure as that of the related art and for crimping and winding a covered electric wire.

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

When the coated electric wire 15 is connected to the press contact terminal 1, the electric wire 15 is crimped by the electric wire crimping portion 6 as shown in FIGS. While being launched to be located on 5a,
By being held by the insulation barrel 5, it is press-fitted 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 in a hook shape bent approximately 180 degrees and is locked by 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. The 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 in contact with the inclined surface 8a to be folded back. It is guided to the stop 7.

FIG. 4 is a sectional view of a forming jig for connecting the crimping terminal 1 to the covered electric wire 15, which is applied to a front end 15 a of the electric wire 15 so that the electric wire 15 is connected to the locking portion 7. This is a molding jig for locking. This jig 20
Is a fixing portion 21 on which the crimp terminal 1 is placed, and the fixing portion 2
And a movable portion 22 which is lowered onto the press-contact terminal mounted on the first 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 portion 22 acts on the front end 15a of the insulated wire 15 placed at a position deviated from the pedestal 21b, contacts the outer peripheral surface of the front end 15a, and can hold it in a gripped state. First and second cylindrical grooves 22a and 22b,
And an inclined wall 22c that acts to suitably bend the front end 15a.

Next, a method of connecting a covered electric wire using this molding jig will be described sequentially with reference to FIGS. In each of the drawings, the crimp terminal 1 is placed on a mounting table 21a such that the pedestal 21b of the jig is inserted into the opening 7a. As shown in FIG. 5, the electric wire 15 is arranged such that the vicinity of the front end 15a is located on the pedestal 21b with respect to the press-connecting terminal 1 thus arranged. 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 by 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 abuts on 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. The lowering of the movable part 22 causes the electric wire 1 to move.
5 is disposed on the locking portion 7 and is bent at a substantially right angle with the projecting end of the locking portion 7 as a bending point, and at the same time, the first
From the groove 22a. When the movable portion 22 continues to move and is lowered to a position immediately before the final molding position where the movable portion 22 is substantially in contact with the press contact terminal 1, as shown in FIG. And comes into contact with the inclined wall 22a of the movable portion 22 and is pushed out. Thereby, the front end 15a slides on 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 portion 22 is lowered to the final molding position, the covered wire 15 has the front end 15 a bent approximately 180 degrees and provided by the locking portion 7. It is pressed from above in a state where it is guided into the pocket, and is locked by the locking portion 7.

On the other hand, as is apparent from FIG. 8, the covered electric wire 15 is provided at the rear side of the pedestal 21b.
Are located above the leading end of the slot 4a and the wire receiving projection 5a of the insulation barrel 5. Then, press-fitting the insulated wire 15 into the press-contact blade 4, the insulation barrel 5 and the wire crimping portion 6
Is performed by a molding jig having substantially the same configuration as before.

That is, as shown in FIG. 9, the jig 3 is a press-fitting jig 3 for press-fitting the insulated wire 15 into the slot 4a.
0, the wire receiving projection 5 of the insulation barrel 5
It comprises a fixing jig 40 for molding the barrel to press the electric wire on a and hold the electric wire 15, and a crimping jig 50 for forming 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. Thereby, the press-fitting jig 30 can press-fit the electric wire 15 into the slot. Further, the fixing jig 40 causes the electric wire 15 to contact the electric wire receiving convex portion 5a of the insulation barrel 5, and at the same time, the insulation barrel 5 has an elastic force, which will be described in detail later. Thus, the barrel 5 is formed so as to sandwich the electric wire 15 from both sides. Further, the crimping jig 50 crimps the wire crimping portion 6 for crimping and winding the wire 15 to bring the wire 15 into pressure contact with the bottom 3b.

By applying these jigs, the press contact terminal 1 is connected to the electric wire 1 fixed by the electric wire crimping portion 6.
5 is raised and bent along the wire guide piece 5b (see FIG. 1) at a shoulder on the rear side of the wire receiving convex portion 5a, and further fixed by the insulation barrel 5. The front end 15a is firmly held in combination with the locking at the locking portion 7, and the wire can be completely prevented from slipping back.

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. Thus, for example, when the front end 15a is press-contacted as described in the description of FIG. 8, a bulge is formed in the electric wire 15 due to the projection of the pedestal 21b. It is absorbed by the bending of the electric wire 15 at the piece 5b. Thereby, the wire 15 is prevented from moving backward from the front end 15a due to the bending of the wire guide piece 5b, and can be prevented from being detached from the locking portion 7. And, in such a coupled state,
The front side of the electric wire 15 placed on the electric wire receiving convex portion 5a is disposed on the locking portion 7 and is supported in a linear shape having substantially the same height. The front shoulder of the wire receiving projection 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 down from the top of the chevron. When the jig 40 is lowered in the direction indicated by the arrow X, the pressing portion 40b abuts to insert the wire 15 into the wire receiving convex portion 5a, and at the same time, the molding surface 40a is Sliding contact is made with the side walls 3a on both sides forming the barrel 5, and the side walls 3a
Are deformed inward from each other. Thereby, the electric wire 15
Are elastically sandwiched in the direction indicated by arrow R by an insulation barrel 5 formed by bending the upper part of the side wall inward, and are fixedly held by the barrel 5.

Since the insulation barrel 5 has such an elastic portion and holds the electric wire 15, the crimp terminal 1 applies an external impact acting on the electric wire holding to the elastic portion. Can be absorbed and relieved by the bending of the wire, so that the wire fixing force can be improved as compared with the conventional crimping and 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 as acting sequentially. However, these jigs act substantially simultaneously to reduce the molding time. It is common to plan.

[0023]

As described above, according to the press-connecting terminal and the method for connecting a covered electric wire using the terminal according to the present invention, the press-connecting terminal is placed on the wire receiving projection to increase the pull-out resistance. Since the electric wire to be bent is arranged on the engaging portion provided on the front side of the electric wire and is supported in a straight line 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 provided. Since the shoulder does not act as an edge to the wire, damage to the 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, it is possible to increase the resistance to pulling out the electric wire and improve the holding force. Further, 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 the drawings]

FIG. 1 is a partially broken perspective view of a press contact terminal showing one embodiment of the present invention.

FIG. 2 is a partially broken perspective view showing a state where a covered electric wire is connected to the press contact terminal of FIG. 1;

FIG. 3 is a longitudinal sectional view of the press contact terminal along the line AA in FIG. 2;

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

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

FIG. 6 is a partial cross-sectional view in which connection has further progressed from the state of FIG. 5;

FIG. 7 is a partial cross-sectional view in which connection has further progressed from the state of FIG. 6;

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

FIG. 9 includes a portion where the coated electric wire is press-fitted into the press-connecting blade,
It is a fragmentary sectional view explaining the connection method with a terminal.

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

FIG. 11 is a perspective view of a conventional press 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 projection 8a Inclined surface 15 Coated electric wire 15a Front end 20, 30, 40, 50 Molding jig Tool 21 Fixed part 22 Movable part 40a Molding surface 40b Pressing part

Claims (2)

(57) [Claims] 1. A crimp terminal formed behind a press-contact blade for press-fitting a covered electric wire, wherein an insulation barrel holding the covered electric wire has a bottom portion provided on a raised bottom-shaped wire receiving convex portion. At the bottom near the front from the blade, the front end of the covered electric wire that is raised and placed on the electric wire receiving projection is held in a straight line having substantially the same height , and
A press-connecting terminal provided with a flange-shaped locking portion for locking the electric wire in a folded state . 2. An insulated wire formed using a crimp terminal formed behind a press-contact blade for press-fitting the insulated wire and holding an insulated barrel holding the insulated wire with a raised bottom-shaped wire receiving protrusion. In the connection method, the coated electric wire is placed on the electric wire receiving convex portion and held by the insulation barrel after being pressed into the press contact blade,
Further, the front end of the covered electric wire is provided at a bottom portion closer to the front from the press contact blade and holds the front end of the covered electric wire in a straight line having substantially the same height, and is guided and crimped by a locking portion that is folded back and locked. Method of connecting insulated wires using crimp terminals.