JPH0433286A - Electric wire pressure-welding method to pressure terminal - Google Patents

Abstract

PURPOSE:To secure good electrical connection performance without extending a pressure edge too long by restricting the outward expansion on both the right and left sides of the upper end portion of the U-shaped slot pressure edge, holding both the right and left sides below the upper end portion expandably outward, and pressing and connecting an electric wire. CONSTITUTION:The upper portion of the periphery wall of the terminal slot 6 of a connector housing 11 storing a pressure terminal 12 is formed into an outside restricting section 7 expanded inward, the right and left interval at the lower portion of the outside restricting section 7 is widened, the upper end portion 5 of the pressure terminal 12 inserted into the terminal slot 6 in advance is pinched and held by the outside restricting section 7, deflection clearances 8 are provided on both sides of the lower portion other than the upper end portion 5, and an electric wire 2 is inserted by pressure from the above and connected. The inserted electric wire 2 in a U-shaped slot pressure edge 1 is pressed and stored in a bag groove with a narrow outlet and a wide inside, the storage volume of the electric wire 2 is increased, the harmful force pushing up the electric wire 2 occurs very rarely, and the electrical connection state between the electric wire 2 and the U-shaped slot pressure edge 1 is satisfactorily stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for press-welding an electric wire to a press-contact terminal in which the electric wire is press-fitted into the press-contact blade of the figure-8 slot of the press-contact terminal to establish connection and conduction.

"Prior Art" and "Problem to be Solved by the Invention" A pressure contact terminal has a pressure contact blade 1 with an 8-shaped slot opening upward as shown in FIG. The electrical wire 2 is press-fitted, the sheath 3 of the wire 2 is cut open by the edge of the pressure contact blade 1, and the conductor 4 and the pressure contact blade 1 are pressed into contact with each other to establish connection and conduction.

However, when the electric wire 2 is press-fitted, in the case of a large-diameter electric wire with a large press-fit resistance, the press-fitting blade 1 whose upper part is open-free will move upward due to the press-fitting force, as shown in Fig. 3 (B). The electric wire 2 is deformed and is press-fitted by the reaction force.
There is a problem in that the electrical connection performance becomes unstable due to the force pushing upward. Therefore, the electric wire to which the press-fitting terminal can be applied has low press-fit resistance and does not cause the above-mentioned deformation as shown in FIG.
The stranded wire is limited to a narrow range, and furthermore, the stranded wire, which has difficulty in stably contacting with the pressure welding blade 1, has the disadvantage that it is difficult to obtain stable electrical performance.

On the other hand, as an improved press-contact terminal that solves the above-mentioned drawbacks, one has been proposed in which the figure-8 slot is deepened to form a two-stage structure, and the bottom of the press-contact blade section is made into a wire accommodating section. However, with this deep slot type, the insulation displacement terminal increases in height, so the connector housing also inevitably becomes larger.In the case of a connector structure in which the electric wire is taken out in the same direction as the terminal mating direction, this increase in size will have an effect. becomes extremely large.

The present invention provides a method for press-connecting an electric wire to a press-contact terminal, which eliminates the drawbacks of the conventional means described above.

The present invention, which solves the above-mentioned technical problems, is based on the following method, with reference to FIG. 1(A) showing its basic concept. When making a press-fit connection, the left and right sides of the upper end portion 5 of the U-shaped slot pressure welding blade 1 are restricted from expanding outward, and the left and right sides below the upper end portion 5 are held so as to be freely expandable outward, and the electric wire 2 is press-fit connected. How to do it.

That is, the specific means for restricting outward expansion and freely expanding outward in one or more press-fit connection methods is to inflate the upper part of the peripheral wall of the terminal housing chamber 6 of the connector housing 11 that accommodates the pressure contact terminal 12 inward, as shown in FIG. At the same time as putting it on the outer regulating part 7 that has come out,
The lower part of the outer regulating part 7 is shaped with a wider left-right interval, and the upper end part 5 of the pressure contact terminal 12 inserted in advance into the terminal accommodating chamber 6 is clamped and held by the outer regulating part 7.
Flexible clearances 8 on both sides of the lower part other than the upper end part 5
is provided, and the electric wire 2 is press-fitted from above. Alternatively, it has an outer regulating portion 7 having the same shape as the terminal accommodating chamber 6 described above.

In addition, the pressure contact terminal 12 is inserted into the press-fit connection jig 9 having a groove-shaped cavity 10 with a wide left-right distance below it, and the electric wire I12 is press-fitted from above. 12 is slid and inserted from the press-fit connection jig 9 into the terminal accommodating chamber 6.

"Function" According to the press-fitting connection method of the present invention described above, when a large-diameter electric wire with a large press-fitting resistance is press-fitted, the upper end of the U-shaped slot pressure welding blade 1 receives the maximum press-fitting resistance, as shown in FIG. 1(B). Part 5 is prevented from expanding outward and maintains its original shape, and the lower parts other than the upper end part 5 are plastically deformed outward in proportion to the press-fitting stress, and the "inlet is narrowed and expanded inward." It has a bag-like slot shape and is configured to receive the electric wire 2.

Therefore, the press-fit electric wire 2 in the U-shaped slot pressure welding blade 1 is in a state of being press-fitted into the bag groove of "outlet depression and inner bulge", and the storage capacity of the electric wire 2 is also increased, so that a harmful force pushing up the electric wire 2 is generated. The electrical connection between the electric wire 2 and the U-shaped slot pressure welding blade 1 is excellent and stable.

When the U-shaped slot pressure welding blade 1 undergoes the above-mentioned plastic deformation, the pressure contact force between the edge of the U-shaped slot pressure welding blade l and the electric wire 2 becomes extremely strong, so that the outer periphery of the electric wire 2 is Further cuts are made to create a clean contact surface,
There is an interlocking type that has a good pressure contact relationship with the − stage.

On the other hand, when press-fitting and connecting a small diameter electric wire 2 with low press-fit resistance, use the U-shaped slot pressure welding blade 1 as shown in the first Wl (C>).
Since no stress is generated that is sufficient to expand and deform the lower portion outward, the above-mentioned plastic deformation effect does not occur, but a press-fit connection similar to that of the conventional structure can be obtained.

Further, when stranded electric wires are press-fitted together, a good connection and conduction state can be obtained by the same effect as in the case of the large-diameter electric wires.

"Effects of the Invention" As explained above, according to the method for press-fitting and connecting electric wires to press-fitting terminals of the present invention, the length of the U-shaped slot press-welding blade can be reduced even in the case of large-diameter electric wires and stranded electric wires that have high press-fit resistance. Since a good electrical connection performance can be obtained without any damage, the disadvantages of the conventional means described above are overcome, and there is an effect of improving the performance of a compact pressure contact terminal that can be usefully used for a wide range of electric wires.

[Brief explanation of the drawing]

Figure 1: Shows the basic concept of the press-fit connection method of the present invention, (A
) is a front view thereof, (B) and (C) are front views showing its working state, FIGS. 2(A) and (B) are perspective views illustrating the specific means of the present invention, and FIG. B) (C): A conventional press-fit connection method is shown, and (A) is a front view thereof. (B) (C) is a front view code indicating its operating state, 1:U
shaped slot pressure welding blade, 2: electric wire, 3: covering, 4: conductor, 5
: Upper end portion of pressure contact blade, 6: Terminal accommodation chamber, 7: Outer regulation portion, 8: Flexible clearance, 9: Press-fit connection jig, 10: Groove cavity 11: Connector housing, 12: Pressure contact terminal patent applicant Sumitomo Wiring Systems Co., Ltd.

Claims (1)

[Claims] (1) When press-fitting and connecting an electric wire to the U-shaped slot crimping blade of a crimping terminal, both the left and right sides of the upper end of the U-shaped slot crimping blade are restricted from expanding outward, and both the left and right sides below the upper end are expanded outward. A method for pressure welding an electric wire to a pressure contact terminal, which is characterized in that the wire is held in a freely expandable manner and the wire is press-fitted.