JPH0433287A - Manufacture of joint section for electric wire terminal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a joint portion of an electric wire end in a branch connection between a main line and a branch line of an automobile wiring harness.

[Conventional technology]

As shown in Fig. 7, the end insulation coatings C of the main lines a, a' and the branch lines were removed and the exposed conductors d were connected by thermocompression bonding, and the two insulating sheet pieces e were bonded together by thermocompression bonding. An insulating coating C portion is sandwiched from the conductor d, and ultrasonic welding portions f are provided around the four peripheries to seal the connection portion.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, since the two insulating sheet pieces e are used in contact with the front and back sides of the connecting conductor, it is difficult to position them in the case of ultrasonic welding, and the peeling strength of the insulating parts is low. Furthermore, when ultrasonically welding the tip of the wire sheath, as shown in Figure 8, the welding die gets caught due to the protrusion of the wire a', exposing the conductor d in this area and causing poor insulation. There is a risk that

The present invention has been made with attention to the above-mentioned points, and an object thereof is to provide a method for manufacturing a joint portion of an electric wire end, which overcomes these drawbacks.

[Means to solve the problem]

In order to achieve the above object, the present invention removes the terminal sheathing of a plurality of electric wires, heat-bonds the exposed conductors and gathers them together, and then covers the wires with an insulating tube from the gathered conductor to the insulation sheath of the electric wires. It is characterized in that the front and back parts of the tube are welded to the insulating coating of each electric wire at the inner end, and the front and back parts are welded to each other at the outer end.

〔Example〕

1 to 4 show the joint part A of the electric wire terminal according to the present invention, in which the insulation coatings 1a, 2a, 3a of the terminals of the main wires 1, 2 and branch wires 3 are removed, and then thermocompression bonding, ultrasonic welding or Cover the conductor B that has been crimped and connected to the main lines 1 and 2 and the branch line 3 with an insulating tube C made of PVC.
insulation coatings 1a, 2a, 3a by ultrasonic waves at the inner ends of
A welded part C' is formed between the front and back parts CI and C2, and a welded part C'' is formed between the front and back parts C, , C, which are overlapped at the outer ends.

FIG. 5 shows the manufacturing process. First, the insulation coatings 1a, 2a, 3a of the terminals of the electric wires 1, 2.3 are removed, and the conductors 1b, 2b,
3b (FIG. 5a), and then a pair of bonder electrodes to bond the conductors 1b, 2b.

3b to form a collective conductor B (Fig. 5b), and then put the cut PVC tube C, including the collective conductor B, over the ends of the electric wires 1, 2.3 (Fig. 5C), Next, ultrasonic waves are applied to the inner and outer ends of the tube C to form welds c', c'' (Fig. 5 d), and the unnecessary outer portion C3 is removed (Fig. 5 e).

In the embodiment shown in FIG. 6, at the inner end of the insulating tube C, the insulating coatings 1a, 2a, 3a and the front and back parts C, , C are formed, leaving non-welded parts between the front and back parts CI and C2 on both sides.
, forming a welded part C''.

In the above embodiment, the case where the outer end and the inner end of the insulating tube C are welded is shown, but only the inner end on the wire insertion side may be welded.

〔Effect of the invention〕

As described above, the present invention removes the terminal coverings of a plurality of electric wires, connects and collects the exposed conductors, and covers the insulating tube from the assembled conductor to the insulation coating of the wires, and Since the front and back parts are welded to each other through the insulating coating of each electric wire, there is no need to adjust the positioning between the insulating tube and the electric wire as in the past, making manufacturing easy and allowing the insulating tube to be covered. Since the ends of the connecting wires are restrained, the joint part can be constructed in an orderly manner, and furthermore, it has the advantage of increasing the peeling strength.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a perspective view of the same, FIG. 3 is a side view, FIG. 4 is a sectional view taken along the line rV-IV in FIG. a)
(bl (C) (dl (el is an explanatory diagram showing the manufacturing process, Fig. 6 is a perspective view of another embodiment of the present invention, Fig. 7 is a plan view of the conventional example, Fig. 8 is a perspective view of the same as above) A... Joint part, B... Collective conductor, C... Insulating tube, C,, C,... Front and back parts, c', c'', C
///...Welded part, l, 2, 3-...Electric wire, l
a, 2a, 3a...insulation coating, 1b, 2b, 3b...
·conductor. Figure 5

Claims (1)

[Claims] The terminal coverings of multiple electric wires are removed, the exposed conductors are connected and assembled, and an insulating tube is placed from the assembled conductor to the insulation coating of the electric wire, and the front and back sides of the tube are covered with the insulation coating of each electric wire at the inner end of the tube. A method for manufacturing a joint portion of an electric wire end, characterized by welding the joint portion to each other via a wire.