JPH11213774A - Forming method for twisted and paired electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form twisted and paired electric wires while inserting electric wire terminals into connectors. SOLUTION: While terminals of both ends of respective electric wires constituting a wire harness being inserted into housing 2A, 2B of a connector or an electric connection box, prescribed two electric wires w1, w2 laid adjacently are pulled out and the center parts of these two electric wires are chucked and the chucked parts are rotated to twist the two electric wires. After that, a tape T is wound on the chucked parts to prevent the two electric wire from being untwisted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a twisted pair electric wire, and more particularly, to a method in which two electric wires are twisted in order to suppress the generation of electromagnetic waves or to absorb the electromagnetic waves, and in particular, are connected to the ends of each electric wire. After the terminals are accommodated in the connector and assembled, the electric wires are twisted.

[0002]

2. Description of the Related Art It is necessary to block generation of noise due to electromagnetic waves in electric wires constituting a circuit connected to a speaker or the like. Therefore, twisted pair wires are used, which are formed by twisting a pair of wires forming a single circuit consisting of a wire connecting the power supply and the speaker and a wire connecting the speaker and the ground, to block electromagnetic waves.

As shown in FIG. 4A, when the twisted pair wires are effective for shielding electromagnetic waves, when the wires w1 and w2 are parallel lines, the magnetic flux density B in the direction of arrow Y1 perpendicular to the parallel lines. When a wire is present, an electromotive force E is applied to the electric wire so that a current flows through directional arrows X1 and X2 that prevent a change in magnetic flux.
1, E2 occurs, and this becomes noise. On the other hand, as shown in FIG. 4B, when the electric wires w1 and W2 are twisted, the electromotive forces E1 and E2 generated by the magnetic flux density B become
Since current flows in the direction of canceling each other for one electric wire, the electromotive forces cancel each other, and therefore, no noise is generated.

According to the above-mentioned principle, a twisted pair wire is effective for shielding electromagnetic waves. Conventionally, as shown in FIG. 5, terminals T are crimped to both ends of scaled and cut wires w1 and w2. Later, the two electric wires w1 and w2 are twisted. That is, the electric wires w1 and w2 are made parallel,
Both ends of these electric wires are sandwiched between chucks C1 and C2, and the chuck C1 at one end is fixed, and the chuck C2 at the other end is rotated in the direction of the arrow, so that the electric wires w1 and w2 are rotated.
2 is a twisted pair twisted.

[0005]

Recently, automatic assembly of a wire harness has been advanced, and a method of automatically connecting an electric wire to a terminal set in a connector is often adopted.
As described above, after the terminal of the electric wire terminal is inserted into the connector, when the connector at one end of the electric wire is rotated by the method shown in FIG. 5, the other electric wires incorporated in the connector may be twisted. Therefore, the above method cannot be adopted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made after connecting both ends to a connector and assembling.
The object is to make the required two electric wires into a twisted pair.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a connector or a housing of an electric connection box, in which terminals at both ends of each wire constituting a wire harness are inserted into adjacent housings. Take out the two wires that were wired in the manner described above, chuck the center of these two wires, twist the two wires by rotating the chucking part, and then tape-wrap the chucking portion. There is provided a method for forming a twisted pair electric wire which is fixed so that the twisting of two electric wires does not return. In the above-mentioned tape winding of the chucking portion, another electric wire group may be tape-wound so that the twisting of the two electric wires does not return.

When the two electric wires are rotated in the chucking portion while integrally rotating the two electric wires while keeping the two electric wires in parallel, the two electric wires can be twisted together. Alternatively, the two electric wires may be chucked one by one at the center, and these two electric wires may be twisted together.

Further, when rotating the above two required electric wires, the root portions on both ends of the housing for inserting the housing are chucked so that the terminal connecting portion inserted into the terminal insertion chamber of the housing is not twisted. preferable.

According to the above-described method of the present invention, even after the wire ends of the wire harness are connected to the housing by the automatic assembling process, twisted pair wires are easily formed by twisting two wires arranged adjacent to each other. be able to. As a result, generation of noise due to electromagnetic waves in these twisted pair wires can be easily prevented.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the steps shown in FIGS. 1A, 1B, and 1C, the twisted pair wires 1 are formed in the temporarily tied wire harness W / H. The wire harness W / H shown in FIG. 1A has terminals (not shown) connected to both ends of each electric wire w.
Are temporarily bound (sub-assembled) inserted and locked in the terminal receiving chambers of the connectors 2A and 2B. The temporary binding wire harness is formed by press-connecting each electric wire w to an insulation displacement terminal set in advance in a terminal receiving chamber of the connector 2A, 2B by an automatic insulation displacement machine. Note that the present invention is not limited to the mode in which the wire end is connected to the connector by pressure welding, but is also applicable to a case where the terminal is crimped to the wire end and the crimp terminal is connected to the connector.

The temporary binding wire harness is shown in FIG.
As shown in FIG. 2, two electric wires w which are the twisted pair electric wires 1
1. The tape T1 is wound around the central part in the length direction of w2 in parallel and chucked. The remaining wire group W3 is tape T
In step 2, wrap it around temporarily so as not to interfere with the work. Furthermore, the terminals inserted into the connectors 2A and 2B of the wires w1 and w2 to be twisted by winding the tapes T3 and T4 around the wires w1 and w2 to be the twisted pair and the roots connected to the connectors 2A and 2B of the other wire group 3. Ensure that the connection does not twist during rotation.

Further, another wire group W which is not a twisted pair
3, when the wires w1 and w2 are rotated and twisted, the wire group W3 is not held in a linearly pulled state so as not to hinder the rotation, and as shown in FIG.
The connectors 2A and 2B are brought close to each other and are in a state of being dubbed to some extent.

In this state, as shown in FIG. 1C, the central chucking portions of the electric wires w1 and w2 are rotated as shown by arrows in the drawing. By this rotation, both ends are tape T3,
The electric wires w1 and w2 fixed at T4 are twisted as shown. With the wires w1 and w2 twisted,
The temporary binding tape T2 of the other wire group W3 is unwound, and the tape T5 is newly wound around the wire group W3 together with the wires w1 and w2 and fixed. By winding the tape T5 in this manner, the twisted electric wires w1 and w2 can be held in a state where the twist does not return. Further, the tapes T3 and T4 wound around the connector base are removed.

In the above method, the electric wires w1 and w2 become the twisted pair electric wire 1. As shown in FIG. 2, the twisted pair electric wire 1 has the same form as the twisted pair electric wire shown in FIG. Therefore, the electromotive forces E1 and E2 generated on the electric wire w1 cancel each other with respect to the magnetic flux density D, and the electromotive forces E1 ′ and E2 ′ generated on the electric wire w2 also cancel each other, and the electromagnetic waves are generated on the electric wires w1 and w2. Noise can be prevented.

FIG. 3 shows another method of twisting the wires w1 and w2. That is, in the method of FIG. 1, the electric wires w1 and w2
Are rotated in a state in which the electric wires w1 and w2 are held in parallel, but in the method shown in FIG. 3, the central portions of the electric wires w1 and w2 are separately held, and the upper electric wire w1 is moved downward from below w2 to the front from the rear. Then, the wire w2, which has been turned upward, is turned from the rear to the front under the wire w1, and this is repeated to twist the wires w1 and w2 together. Also according to this method, the electric wires w1 and w2 can be twisted.

[0017]

As is apparent from the above description, according to the present invention, a twisted pair wire can be easily formed even after the wire terminal is connected to a connector or an electric junction box by an automatic machine. Therefore, even when twisted pair wires are included, the wire harness can be assembled by an automatic machine, the range of automation of wire harness assembly can be expanded, and the productivity of the wire harness can be increased.

Further, in the present invention, with the both ends inserted into the housing of the connector, the central part of the wire as a twisted pair is chucked and rotated, and after being twisted by the rotation, fixed with tape and twisted. Since this is a simple operation for preventing the alignment from being returned, the operation can be easily performed without requiring any equipment.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are process diagrams of an embodiment of the present invention.

FIG. 2 is a view showing a formed twisted pair electric wire.

FIG. 3 is an explanatory diagram showing another method.

FIGS. 4A and 4B are diagrams for explaining the effect of an electromagnetic wave on an electric wire.

FIG. 5 is a schematic view showing a conventional twisted pair forming method.

[Explanation of symbols]

 w1, w2 Twisted pair wire W3 Other wire group W / H Wire harness T1-T5 Tape 1 Twisted pair wire 2A, 2B Connector

Claims (3)

[Claims] In a state in which terminals at both ends of each wire constituting a wire harness are inserted into a connector or a housing of an electric junction box, two required adjacent wires are taken out, and these two wires are taken out. Chucking the central part of the electric wire, twisting the two electric wires by rotating the chucking part, and then fixing the chucking portion with tape so that the two electric wires are not twisted back. Method of forming twisted pair wires. 2. The tape winding of the chucking portion is as follows.
The method for forming a twisted pair electric wire according to claim 1, wherein the wire is wound together with another non-twisted electric wire group. 3. The method according to claim 1, wherein when the two electric wires are rotated, a root portion on an insertion side is chucked to the housing of the electric wire so that the terminal connection portion inserted into the terminal insertion chamber of the housing is not twisted. The method for forming a twisted pair electric wire according to claim 1 or 2.