JPH10270098A - Pressure welding structure of insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press-fitting structure for a covered electric wire which has a simple structure and can be easily manufactured without increasing the insertion force of the covered electric wire into a slit. SOLUTION: A press-contact slit 13 which is provided on an outer periphery of a terminal plate 12 made of a conductive plate material and is provided so as to penetrate both sides of the terminal plate 12, and into which a covered electric wire 16 is inserted along a penetrating direction.
And inner walls 14a, 14 of the pressing slit 13 facing each other.
b, and extends toward the outer periphery of the terminal plate 12 to form an opening, from which the covered electric wire 16 has a pair of inclined introduction walls 15a and 15b through which the covered electric wire 16 is introduced into the press-fitting slit 13. And the introduction angle θ formed by the pair of inclined introduction walls 15a and 15b is set to 20 degrees or more and 60 degrees or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-connecting structure for press-connecting a covered electric wire.

[0002]

2. Description of the Related Art FIGS. 7A, 7B and 7C show a press contact terminal 1 described in Japanese Utility Model Laid-Open No. 2-87378.
In the press contact terminal 1, terminal plates 2 and 3 are bent and stacked. Slits 4 are formed in these terminal plates 2 and 3. The slit 4 is provided on the terminal plate 2, and is provided on the terminal plate 3. The insertion portion 7 has a slit width substantially equal to the outer diameter of the core wire 6 of the insulated wire 5. It is composed of a press-contact slit 4 formed on the rear side with a core wire press-contact insertion portion 8 having a short slit width.

When the covered electric wire 5 is inserted into the slit 4 as shown in FIG. 6A, the covered portion 10 of the covered electric wire is cut by the covering cutting insert 7, and in this state, the covered portion 10 is further inserted into the slit 4. When the core wire 6 is inserted, the core wire 6 is pressed against the insertion portion 8 for core wire pressure contact, and is electrically connected.

In this press contact terminal 1, the dimensions of the inside of the slit 4 are set in two stages, and after the covering portion of the covered wire 5 is cut, the core wire is pressed into contact with the wire. The insertion force at the time of insertion can be reduced.

[0005]

However, in the case of forming a press contact terminal in which the internal dimensions of the slit are set in two stages as described above, it is very difficult to manufacture the press contact terminals according to the set dimensions. Since dimensional accuracy is required, the manufacturing cost also increases.

Further, when a terminal for press-contacting a small-diameter covered electric wire, that is, a slit having a very small width, it is very difficult to form the slit.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a press-fitting structure for a covered electric wire which does not require a high insertion force of the covered electric wire into a slit, has a simple structure, and is easy to manufacture.

[0008]

In order to achieve the above object, a first aspect of the present invention is to provide a covered electric wire which is provided at an outer peripheral end of a terminal plate made of a conductive plate material and is provided through both sides of the terminal plate. Are formed along the through-hole in the press-contact slit, and are respectively connected to the inner walls of the press-contact slit and spread toward the outer peripheral end of the terminal plate to form the opening. A press-fitting structure of a covered electric wire having a pair of inclined introduction walls to be introduced, wherein an introduction angle formed by the pair of inclined introduction walls is set to be not less than 20 degrees and not more than 60 degrees.

[0009] In this press-fitting structure of a covered electric wire, the covered electric wire is inserted between a pair of inclined introduction walls set at an introduction angle of not less than 20 degrees and not more than 60 degrees, and is press-fitted into a press-fitting slit. The portion is cut by the inner wall of the press contact slit, and the core wire and the inner wall of the press contact slit come into contact and are electrically connected.

In this case, by setting the angle formed by the inclined introduction wall to be not less than 20 degrees and not more than 60 degrees, it is possible to reduce the insertion force of the insulated wire into the pressure welding slit.

According to a second aspect of the present invention, in the first aspect of the present invention, the angle between the pair of inclined introduction walls is in a range of 20 degrees or more and 60 degrees or less from the inner wall side to the opening side of the press-contact slit. It is characterized by comprising a plurality of inclined introduction walls that change continuously.

In this press-fitting structure of a covered electric wire, when the covered electric wire is inserted into the press-fitting slit, the covering portion is cut stepwise by the inclined introduction wall portion, and finally, the core portion of the coated electric wire is press-fitted into the press-fitting slit. Is done.

A third aspect of the present invention is the invention according to the second aspect, wherein a continuous portion of the plurality of inclined introduction wall portions is continuously formed in an arc shape.

In this press-fitting structure of the covered electric wire, the covered portion of the covered electric wire is smoothly cut when the covered electric wire is inserted into the press-fitting slit and the covered portion is cut stepwise by the inclined introduction wall portion.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a press-fitting structure of a covered electric wire according to the present invention will be described. FIG. 1 (a)
FIG. 1 is a perspective view showing a terminal 11 formed by bending a conductive plate material, and FIG. 1B is a front view showing the terminal plates 12.

As shown in FIG. 1A, the terminal 11 is formed by bending a conductive plate material into a U-shape. The terminal 11 is formed with two terminal plates 12, 12, and these terminal plates 12, 12 are formed with press-contact slits 13, 13, respectively. The press-contact slit 13 opens at the upper outer peripheral end of the terminal plate 12 and is provided to penetrate both sides of the terminal plate 12.

The terminal plate 12 has a press-contact slit 13.
Are connected to the inner walls 14a and 14b facing each other, and are spread toward the upper outer peripheral end of the terminal plate 12 so that the press-contact slit 13
Are provided with a pair of inclined introduction wall portions 15a and 15b. In addition, these inclined introduction walls 15a,
15b is set to be not less than 20 degrees and not more than 60 degrees.

Then, as shown in FIG. 2 (a), a covered electric wire 16 is placed between the inclined introduction walls 15a and 15b.
As shown in FIG. 2B, the pressing is performed by a press-fitting jig (not shown) toward the space between the press-contact slits 13. When the coated electric wire 16 is press-fitted between the press-fitting slits 13, the inclined introduction wall portions 15a, 1
The covering portion 17 of the covered electric wire 16 is cut by the end face of 5b, and as shown in FIG. 2C, the core wire portion 18 is inserted into the press contact slit 13 while deforming to the width of the press contact slit 13. Finally, the insulated wire 16 is
2D, the core wire portion 18 is inserted between the pressure contact slits 13, and the core wire portion 18 and the inner walls 14a, 14b of the pressure contact slit 13 are brought into contact with each other to be electrically connected. You.

Next, the electric wire insertion force (N) with respect to the insertion stroke shown in FIG. 3 will be described. In FIG. 3, the curve A indicates that the angle θ formed by the inclined introduction walls 15a and 15b is 120.
And the curve B shows the case where the angle θ is 90 degrees. Curve C shows a case where the angle θ is not less than 20 degrees and not more than 60 degrees.

As shown in the figure, curves A and B show that the wire insertion force peaks when the insertion stroke is short, whereas curve C shows the wire insertion force when the insertion stroke is about half. Peaks. Therefore, the angles θ formed by the curves A and B, that is, the inclined introduction wall portions 15a and 15b are 120
In the case of 90 degrees, the insulated wire 16 is
Immediately after the insertion between the three, the wire insertion force becomes maximum, and the maximum force is required immediately after press-fitting.

On the other hand, in the curve C, that is, the angle θ between the inclined introduction walls 15a and 15b is not less than 20 degrees and not more than 6 degrees.
If the angle is 0 degrees or less, the insulated wire 1
6, the wire insertion force reaches its peak after a while. Moreover, the electric wire insertion force at the peak is represented by curve A,
The value is about 20 N lower than that of B.

The reason for this is that the inclined introduction wall 15a,
15b is not less than 20 degrees and not more than 60 degrees, the covering portion 1 of the covered electric wire 16 is placed in the state shown in FIG.
7 easily breaks at the end surfaces of the inclined wall portions 15a and 15b. In this state, the core wire portion 18 has not yet been inserted into the press-contact slit 13, so that the electric wire insertion force does not increase. Then, as shown in FIG. 2C, only the core wire portion 18 is press-fitted into the press-fitting slit 13 in a state where the covered portion 17 of the covered wire 16 is completely cut, so that the peak of the wire insertion force is low. Value.

Next, the terminal contact load (N) with respect to the insertion stroke shown in FIG. 4 will be described.

In FIG. 3, a curve A represents the inclined introduction wall portion 15.
a and 15b show the case where the angle θ is 120 degrees, and the curve B shows the case where the angle θ is 90 degrees. Curve C shows a case where the angle θ is not less than 20 degrees and not more than 60 degrees.

As shown in the figure, the curve C is obtained from the curves A and B
This indicates that a higher terminal contact load was obtained.
That is, the angle θ between the inclined introduction wall portions 15a and 15b is 120 degrees and 90 degrees.
A higher terminal contact load was obtained when the angle θ formed by b was not less than 20 degrees and not more than 60 degrees.

The reason for this is that, as described above, FIG.
In the state of (b), only the covering portion 17 of the covered electric wire 16 is cut, and the core wire portion 18 has not yet been inserted into the press-contact slit 13, and furthermore, the inclined introduction wall portions 15a, 15
Since the core portion 18 is not cut at b, there is no cutting of the core portion 18. As a result, as shown in FIG. 2C, only the core wire portion 18 is inserted into the pressure contact slit 13 and there is no variation in the core wire, so that the core wire portion 18 between the pressure contact slits 13 can obtain a high contact load.

As described above, according to the present embodiment, by setting the angle θ between the inclined introduction walls 15a and 15b to be not less than 20 degrees and not more than 60 degrees, the insertion force of the insulated wire 16 into the press-fitting slit 13 is set. The height is not increased, and the angles of the inclined introduction wall portions 15a, 15b are simply set, so that the manufacturing is easy with a simple structure.

Further, since a high terminal contact load can be obtained, high reliability in electrical connection can be obtained.

Next, another embodiment shown in FIGS. 5 and 6 will be described. The embodiment shown in FIG. 5 is an example in which the angle formed by the inclined introduction wall portions 22a and 22b is changed in two stages. That is, the inclined wall portion 2 of the terminal plate 21 of this embodiment
2a, 22b are inner walls 14a, 14
The first inclined wall portions 23a and 23b following the second inclined wall portion b, and the second inclined wall portions 24a and 24b extending from the first inclined wall portions 23a and 23b to the opening are formed. Then, the angle θ formed by the first inclined wall portions 23a and 23b is set to 20 degrees, and the angle θ formed by the second inclined wall portions 24a and 24b is 60 degrees.
Set to degree.

The inclined walls 26a and 26b of the terminal plate 25 of the embodiment shown in FIG. 6 are examples in which the angle θ formed by the inclined walls 26a and 26b is changed in four stages. That is, the inclined walls 26a, 26b of the terminal plate 25 of the present embodiment are composed of first inclined walls 27a, 27b following the inner walls 14a, 14b of the press-contact slit 13, and the first inclined walls 27a, 27b.
b, a second inclined wall portion 28a, 28b following the second inclined wall portion 28a, 28b, and a third inclined wall portion 29a, following the second inclined wall portion 28a, 28b.
29b, and fourth inclined wall portions 30a and 30b extending from the third inclined wall portions 29a and 29b to the opening side.

The angle θ formed by the first inclined wall portions 27a and 27b is set to 30 degrees, and the second inclined wall portion 28
a and 28b are set to 40 degrees, the angle θ between the third inclined wall portions 29a and 29b is set to 50 degrees, and the angle θ between the fourth inclined wall portions 30a and 30b is 60 degrees.
Set to degree.

As shown in FIGS. 5 and 6, by changing the inclined introduction wall portions 22a, 22b, 26a, 26b stepwise within the range of 20 degrees or more and 60 degrees or less, the same effect as in the above embodiment is obtained. In addition to the effect, the covered portion 17 of the covered wire 16 is more easily cut, and the
6 can be inserted smoothly because it is not hooked, and the wire insertion force is further reduced.

The electric wire insertion force can be further reduced by connecting the continuous portions of the inclined introduction walls to each other in an arc shape.

[0034]

As described above, according to the first aspect of the present invention, by setting the angle formed by the inclined introduction wall to be not less than 20 degrees and not more than 60 degrees, the insertion force of the insulated wire into the press-fitting slit is reduced. can do. Accordingly, it is possible to provide a press-fitting structure of a covered electric wire which does not increase the insertion force of the covered electric wire into the slit, has a simple structure, and is easy to manufacture.

According to the second aspect of the present invention, when the covered electric wire is inserted into the press-contact slit, the covering portion is cut stepwise by the inclined introduction wall portion, and finally, the core wire portion of the covered electric wire is inserted into the press-contact slit. Since it is press-fitted, only the covered electric wire can be cut by the inclined introduction wall portion, and the core portion is not cut, so that the core wire can be prevented from coming apart.

According to the third aspect of the present invention, when the covered wire is inserted into the press-contact slit and the covered portion is cut stepwise by the inclined introduction wall portion, only the covered portion of the covered wire is cut smoothly. be able to.

[Brief description of the drawings]

FIGS. 1A and 1B show a terminal to which a press-contact structure of a covered electric wire according to the present invention is applied, wherein FIG. 1A is a perspective view and FIG. 1B is a front view.

FIGS. 2A and 2B show a procedure for press-fitting a covered wire into a terminal to which a press-fitting structure of a covered wire according to the present invention is applied, and FIG. 2A is a front view showing a state where the covered wire is placed on a press-fitting slit;
Is a front view showing a state in which a covered portion of the covered wire is cut by inserting a covered wire between the inclined introduction wall portions, (c) is a front view showing a state in which a core portion is pressed into a press-fitting slit, and (c) is a front view. It is a front view showing the state where a covered electric wire was finally press-fitted in the press-fitting slit.

FIG. 3 is a diagram showing a change in electric wire insertion force with respect to an insertion stroke.

FIG. 4 is a diagram showing a change in terminal contact load with respect to an insertion stroke.

FIG. 5 is a front view showing a terminal board of another embodiment in which the inclined introduction wall is formed in two stages.

FIG. 6 is a front view showing a terminal plate according to another embodiment in which an inclined introduction wall portion is formed in four stages.

FIG. 7 shows a conventional pressure contact terminal, (a) is a front view,
(B) is a side view, and (c) is a rear view.

[Explanation of symbols]

 12, 21, 25 Terminal plate 13 Pressure contact slit 14a, 14b Inner wall 15a, 15b Inclined introduction wall 16 Insulated wire 17 Covered portion 18 Core line 22a, 22b Inclined introduction wall 23a, 23b First inclined introduction wall 24a, 24b Second inclined introduction wall 26a, 26b Inclined introduction wall 27a, 27b First inclined introduction wall 28a, 28b Second inclined introduction wall 29a, 29b Third inclined introduction wall 30a, 30b Fourth Inclined wall

Claims (3)

[Claims] 1. A pressure contact slit which is provided at an outer peripheral end of a terminal plate made of a conductive plate material and is provided through both sides of the terminal plate, and in which a covered electric wire is inserted along a penetrating direction, and a pressure contact slit facing the pressure contact slit. And a pair of inclined introduction walls, each of which is continuous with the inner wall to be extended toward the outer peripheral end of the terminal plate to form the opening, and through which the covered electric wire is introduced into the press-fitting slit. Wherein the introduction angle formed by the pair of inclined introduction walls is set to not less than 20 degrees and not more than 60 degrees. 2. The invention according to claim 1, wherein the angle formed by the pair of inclined introduction walls is stepwise continuously from the inner wall side to the opening side of the press contact slit in a range of 20 degrees or more and 60 degrees or less. A press-fitting structure for a covered electric wire, comprising a plurality of changing inclined introduction walls. 3. The pressure-welded structure for a covered electric wire according to claim 2, wherein a continuous portion of the plurality of inclined introduction wall portions is formed continuously in an arc shape.