JPH0527773Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to the shape of a connecting terminal portion of an electric wire, particularly for connection to another conductor by welding.

"Prior Art" When connecting an electric wire to another conductor by welding, such as connecting the inner conductor of a coaxial cable to the center conductor of a connector by welding, conventionally, as shown in FIG. The connecting terminal portion 51 to be welded to the connecting terminal portion 61 of the other conductor 60 may be made into a rectangular overall flat shape, or alternatively, as shown in FIG. The connecting terminal portion 51 to be welded to the connecting terminal portion 61 is circular and has a small thickness at the center portion in the longitudinal direction of the electric wire 50.

``Problem to be solved by the invention'' However, the connecting terminal portion of the electric wire has a shape in which the cross section of the electric wire 50 rapidly decreases from the circular portion to become flat, as shown in the connecting terminal portion 51 in FIG. In this case, there is an inconvenience that the strength of the connecting terminal portion 51 is reduced.

Moreover, if the connecting terminal part of the electric wire has a shape like the connecting terminal part 51 in FIG. As is clear from the comparison of the positional relationship between the connecting terminal portion 51 of the electric wire 50 and the welding electrode 70 on the electric wire 50 side when the electric wire 50 is tilted with respect to the connecting terminal portion 61 of the electric wire 50, the conductor of the electric wire 50 The bonding area between the connecting terminal portion 51 of the electric wire 50 and the connecting terminal portion 61 of the conductor 60 changes depending on the presence and degree of inclination of the wire 60 with respect to the connecting terminal portion 61, which has the drawback of causing variations in bonding strength.

Furthermore, when the connecting terminal part of the electric wire has a shape like the connecting terminal part 51 in FIG. When the connecting terminal portion 51 softens and thermally expands, the connecting terminal portion 51 bulges in a direction perpendicular to the longitudinal direction of the electric wire 50 as shown by the arrow, and as a result, the thickness of the connecting terminal portion 51 becomes smaller and the connecting terminal portion 51 In addition, the contact area between the connecting terminal portion 51 and the connecting terminal portion 61 of the conductor 60 increases, resulting in a disadvantage that a large amount of current must flow.

Furthermore, if the connection terminal part of the electric wire is
When the shape is like the connecting terminal part 51 in the figure,
Since the contact area between the connecting terminal portion 51 and the welding electrode 70 and the connecting area between the connecting terminal portion 51 and the connecting terminal portion 61 of the conductor 60 are approximately equal, and the pressure distribution is approximately uniform in each contact portion, The current is not sufficiently dispersed at the contact portion between the connecting terminal portion 51 and the welding electrode 70, and there is a risk that the two may be joined together, and the connecting terminal portion 51 and the conductor 6
At the contact portion with the connection terminal portion 61 of No. 0, the current does not concentrate at the center, and there is a drawback that the two are not bonded with sufficient bonding strength.

Therefore, this idea has been developed to increase the strength of the connecting terminal in electric wires that have connecting terminals that are connected to other conductors by welding, to prevent variations in the bonding strength, and to avoid softening of the connecting terminal due to energization and heat generation. The expansion does not cause a decrease in the strength of the connecting terminal, there is no risk of the connecting terminal and the welding electrode being joined, and the connecting terminal and the conductor's connecting terminal are joined with sufficient bonding strength. This is what I did.

``Means for solving the problem'' In this invention, the connection terminal part of the electric wire has a minimum thickness at the welding center in the longitudinal direction of the electric wire, and the thickness gradually increases in a straight line as it moves away from the welding center. The wire should have a shape that increases in size as the wire changes, and in the direction perpendicular to the longitudinal direction of the wire, the thickness is maximum at the welding center, and the thickness decreases linearly as it moves away from the welding center.

``Function'' In the electric wire of this invention configured as described above, the thickness of the connecting terminal portion decreases linearly and gradually as it approaches the welding center in the longitudinal direction of the wire, so that the connecting terminal The strength of the connecting terminal section is increased, and the connecting terminal section becomes strong against bending and tension.

In addition, the above-mentioned connecting terminal part is made so that the surface shape of the welding electrode on the wire side matches the surface shape of the connecting terminal part to be formed, and the welding electrode is attached to the electric wire on which the connecting terminal part is to be formed. It can be formed by crushing the wire by press-welding it, and as a result, the connection terminal part is always automatically aligned at the correct predetermined position with respect to the welding electrode on the wire side, so it remains in that state. By energizing, the bonding area between the connecting terminal portion and the connecting terminal portion of the conductor to be welded becomes constant, so that there is no variation in bonding strength.

Furthermore, when energizing, the connection terminal part is held down from both sides by the welding electrode on the wire side in the direction perpendicular to the longitudinal direction of the wire, and the distance between the welding electrode on the wire side and the connection terminal part of the conductor becomes smaller. Therefore, when the connecting terminal part of the electric wire softens and thermally expands due to energization, the connecting terminal part is prevented from bulging in the direction perpendicular to the longitudinal direction of the electric wire, and the thickness of the connecting terminal part is reduced. There is no reduction in strength, and there is no need for a large amount of current to flow due to an increase in the contact area between the connecting terminal portion and the connecting terminal portion of the conductor.

In addition, the contact area between the connecting terminal part and the welding electrode on the wire side becomes larger than the contact area between the connecting terminal part and the connecting terminal part of the conductor to be welded, and the contact area between the connecting terminal part of the electric wire and the connecting terminal part of the conductor The contact pressure is greatest at the center of the contact area, so
The current is sufficiently dispersed at the contact point between the connection terminal of the wire and the welding electrode on the wire side, so there is no risk of the two being joined, and at the contact point between the connection terminal of the wire and the connection terminal of the conductor, the current is sufficiently dispersed. Current is concentrated at the center, and the two are bonded with sufficient bonding strength.

``Example'' FIG. 1 shows an example of the electric wire of this invention together with a conductor to be welded thereto.

The end of the wire 10 is exposed, and a connection terminal portion 11 is formed at a portion near the tip.

In the longitudinal direction of the electric wire 10, the connection terminal portion 11 is
The thickness is minimum at welding center 11a, and welding center 1
It has a shape in which the thickness gradually increases linearly as it moves away from the welding center 1a, and in the direction perpendicular to the longitudinal direction of the electric wire 10, the thickness is maximum at the welding center 11a and increases as it moves away from the welding center 11a. The shape is shaped so that the thickness decreases in a linear manner. Specifically, the angle formed by the ridgeline 11b extending in one longitudinal direction of the electric wire 10 from the welding center 11a and the ridgeline 11c extending in the other direction is 90° between 90° and 180°.
be made sufficiently larger.

In this way, the thickness of the connecting terminal portion 11 decreases linearly and gradually as it approaches the welding center 11a in the longitudinal direction of the electric wire 10, so the strength of the connecting terminal portion 11 increases, and the thickness of the connecting terminal portion 11 becomes strong against bending and tension.

As shown in FIG. 2, the connection terminal part 11 is made to match the surface shape of the welding electrode 30 on the wire 10 side, and the other welding electrode 40, the connecting terminal part 21 of the conductor 20 to be welded to the connecting terminal part 11 is arranged, and the electric wire 10x to form the connecting terminal part 11 is placed on the connecting terminal part 21, and the welding electrode 30 is connected to the electric wire. Lower the electric wire 10 along 10x
Form by collapsing x.

As a result, as shown in FIG.
1 is always automatically aligned at a predetermined correct position with respect to the welding electrode 30 on the wire 10 side, and the welding electrode 30 on the wire 10 side remains in that state.
By applying current between the conductor 20 and the welding electrode 40 on the conductor 20 side, the bonding area between the connecting terminal portion 11 and the connecting terminal portion 21 of the conductor 20 becomes constant, and there is no variation in bonding strength.

Furthermore, when energizing, the connection terminal portion 11 is connected to the welding electrode 30 in a direction perpendicular to the longitudinal direction of the electric wire 10.
At the same time, the distance between the welding electrode 30 and the connecting terminal portion 21 of the conductor 20 becomes smaller, so that when the connecting terminal portion 11 softens and thermally expands due to energization, the connecting terminal portion 11 will be pressed against the wire 10. The bulge in the direction perpendicular to the longitudinal direction is suppressed, the thickness of the connecting terminal portion 11 is not reduced and the strength of the connecting terminal portion 11 is not reduced, and the connecting terminal between the connecting terminal portion 11 and the conductor 20 is There is no need for a large amount of current to flow due to an increase in the contact area with the portion 21.

In addition, the contact area between the connecting terminal portion 11 and the welding electrode 30 is smaller than the contact area between the connecting terminal portion 11 and the conductor 20.
1 and the contact pressure is greatest at the center of the contact area between the connecting terminal part 11 and the connecting terminal part 21 of the conductor 20, so that the contact area between the connecting terminal part 11 and the welding electrode 30 The current is sufficiently dispersed in the part, so there is no risk of the two being joined, and the connecting terminal part 11 and the conductor 2
At the contact portion with the connection terminal portion 21 of No. 0, a current is concentrated at the center thereof, and the two are joined with sufficient joint strength.

``Effects of the invention'' As described above, according to this invention, the strength of the connection terminal part is increased, there is no variation in bonding strength, and the connection terminal part becomes softer due to softening or thermal expansion due to energization. There is no risk of the connecting terminal portion and the welding electrode being joined together without causing a decrease in strength, and the connecting terminal portion and the connecting terminal portion of the conductor are joined with sufficient bonding strength.

[Brief explanation of the drawing]

Figure 1 shows an example of the electric wire of this invention together with a conductor to be welded to it, A is a perspective view, B is a plan view,
C is a side view, D is a cross-sectional view of B on line D-D, second
The figures show the method of forming the connection terminal part, A is a cross-sectional view along the longitudinal direction of the electric wire, B is a cross-sectional view along the direction perpendicular to the longitudinal direction of the electric wire, FIG. 3 shows the state when energized, B is a cross-sectional view along the longitudinal direction of the electric wire, B is a cross-sectional view along the direction perpendicular to the longitudinal direction of the electric wire, FIG. Side view, C is C-C of A
A cross-sectional view along the line, D is a plan view when the electric wire is inclined with respect to the connecting terminal portion of the conductor, FIG. 5 shows another example of a conventional electric wire together with a conductor to be welded to it, A is a plan view, B is a side view, and C is a sectional view taken along the line CC of A.

Claims (1)

[Scope of Claim for Utility Model Registration] In the longitudinal direction of the electric wire, the electric wire has a shape in which the thickness is minimum at the welding center, and the thickness gradually increases in a linear manner as the distance from the welding center increases. An electric wire with a connecting terminal portion having a shape in which the thickness is maximum at the welding center and the thickness decreases in a linear manner as it moves away from the welding center.