JPH0697575B2 - Wire for pressure contact terminal and connection structure with pressure contact terminal - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a technique for press-connecting an electric wire to a terminal fitting in an automobile wire harness or the like.

[Conventional technology]

To connect a terminal fitting to an electric wire in a wire harness for an automobile, the conductor exposed by previously removing the insulating coating from the end is placed in the U-shaped crimp piece of the terminal fitting, and the U-shaped crimp piece is molded by a mold. This was done by crimping and crimping the conductor, but recently, the electric wire was immediately pressed into the U-shaped press-contact groove of the terminal fitting without removing the insulating coating, and at this time, the U-shaped The conductor is brought into contact with the U-shaped press contact blade while cutting the insulating coating with the press contact blade of the press contact groove.

That is, in FIG. 7, 1 is an insulation-coated wire, 1a is a conductor, 1b is an insulation coating, 2 is a pressure contact terminal in a state where only the wire connection part is shown with the electric contact part omitted, and 21 is a pressure contact groove. is there.
Tapered blade portions 22, 22 for guiding the electric wire 1 are formed at the inlets of the two pressure contact grooves 21, 21 formed in front of and behind the pressure contact terminal 2, and the pressure contact blades 23 face each other. There is.

The wire 1 is pressed in the direction of the arrow, and the tapered blades 22,22
The insulation coating 1b is cut by and enters the pressure welding groove 21
It is sandwiched between 23 and 23 and electrically connected to the press contact terminal 2.
FIG. 8 shows a pressure contact state of the electric wire 1 and the pressure contact terminal 2, (a)
Shows the case where the conductor 1a is a single wire, and (b) shows the case where the conductor 1a 'is a stranded wire.

[Problems to be Solved by the Invention]

By the way, in the above-mentioned prior art, in order to secure sufficient contact between the pressure contact terminal 2 and the electric wire 1, the diameter d of the circular conductor 1a is required.
(Fig. 7) and the width a of the press contact groove 21 are a <b so that an appropriate contact pressure is maintained between the conductor and the press contact groove after press contact, and the conductor is broken or the press contact blade is plastically deformed. It is necessary to set it within the range that does not cause, and if the diameter of the conductor 1a changes due to the size change of the electric wire 1, a dedicated pressure contact terminal having a pressure contact groove with a width corresponding to this is required, and therefore the pressure contact terminal There is a problem that the number of types increases, the usage becomes complicated, and the cost of the pressure contact terminal becomes high.

The present invention has been made by paying attention to the above points, and enables electric wires of various sizes to be press-contacted to a common press-contact terminal even if the size of the electric wire is changed.

[Means for Solving the Problems]

In order to achieve the above object, in the electric wire of the present invention,
An electric wire for a pressure contact terminal made up of a plurality of types, characterized in that the conductor has an oval cross section with the same minor diameter dimension and an insulating coating layer is provided around the conductor, and the minor diameter side of the conductor is pressure bonded to the terminal fitting. The present invention provides a contact structure for contacting a press contact blade in a groove.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 4 are views showing an embodiment of the present invention. In these drawings, 1 is an electric wire, 11 is an elliptic conductor having an elliptical cross section, and 12 is an insulating coating layer. The minor diameter dimension of the conductor 11 having an oval cross section is b, and the major diameter dimension is c. 2 is a pressure contact terminal, 21
Is a pressure contact groove in which a pressure contact blade 23 is formed, 22 is a tapered blade portion for guiding the electric wire 1, and two pressure contact grooves 21, 21 are provided in front of and behind one pressure contact terminal 2. The width of the pressure contact groove 21 is a.

FIG. 2 shows a cross section of an electric wire 1 having a conductor 11 having an oval cross section according to the present invention. The conductor 11 having an elliptical cross section is composed of a plurality of conductors formed by changing the major diameter dimension c in various ways while keeping the minor diameter dimension b constant.

For example, when the minor axis dimension b = 0.9 mm, the electric wire has a cross-sectional area of 0.5 mm ² with c = 0.9 mm.

An electric wire with a cross-sectional area of 0.85 mm ² at c = 1.2 mm.

An electric wire with a cross-sectional area of 1.25 mm ² at c = 1.9 mm.

As shown in FIGS. 3A and 3B, the width a of the press contact groove 21 is
Is formed to have an optimum width with respect to the minor axis dimension b = 0.9 mm.
Can be connected by pressure welding.

The pressure contact terminal 2 and the electric wire 1 are connected as follows. First, as shown in FIGS. 4 (a) and 4 (b), an electric wire is placed on the tapered blade portion 22, and the electric wire 1 is slowly moved, for example, by an arrow R.
Direction to determine the insertion posture for the press contact groove 21. When the electric wire 1 is press-fitted into the press-contact groove 21 in this state, the insulating coating 12 is cut by the tapered blade portion 22 and the conductor having an oval cross section.
When the short diameter of 11 and the press contact groove 21 coincide with each other, the electric wire 1 enters the press contact groove 21 as shown in FIG. 4 (c), and the electric wire 1 and the press contact terminal 2 are connected.

In this case, if the pressing direction is clearly known from the outside, the work will be easy. For example, if the insulating coating layer 12 has the same thickness in any direction, the outer shape of the electric wire 1 also becomes oval in cross section, and the pressure contact direction can be easily seen from the outside.
On the other hand, the pressure contact direction can also be known by forming the outer shape of the electric wire 1 into a circular shape and, instead, attaching a mark such as a minute groove or rib to a position corresponding to the major axis or the minor axis of the conductor 11 having an oval cross section. .

FIG. 3 (a) shows the pressure contact state of the electric wire 1 and the pressure contact terminal 2 when the conductor 11 having an oval cross section is a single wire, and FIG. 3 (b) shows the pressure contact state when the conductor 11 is also a stranded wire.

Next, a method of manufacturing the electric wire 1 having the conductor 11 having an oval cross section will be described with reference to FIGS.

As shown in FIG. 5 (a), a conventional conductor 1 having a normal circular cross section from the wire 11 ″ is formed by the extrusion molding machine 3.
Mold 1 '.

As shown in FIG. 5 (b), this conductor 11 'is sandwiched between a pair of rollers 4 and 4 which rotate in the direction of the arrow to form a flat shape.
A conductor 11 having an oval cross section is obtained. At this time, a conductor with an oval cross section
The minor axis dimension b of 11 is formed to be the same dimension for a group of electric wires, that is, electric wires of a plurality of sizes having different major axis dimensions.

Next, as shown in FIG. 5C, the conductor 11 having an oval cross section is supplied to the insulator extruder 5. At this time, the roller
The insulator extruder 5 is installed immediately after 4, 4 and the like so that the direction of the major axis or the minor axis of the conductor 11 having an oval cross section is kept constant. There is an insulating coating material 12 'that has been heated and melted in the insulator extruder 5, and a conductor having an oval cross section when pressure P is applied.
The insulating coating 12 is formed by covering the periphery of the wire 11, and the electric wire 1 having the conductor 11 having an oval cross section is completed.

Since the electric wire 1 of each size formed in this manner has the same minor axis dimension b, it is possible to press-connect to one type of press-contact terminal. As for the minor axis dimension b, it is preferable that the electric wires are divided into groups according to the size of the cross-sectional area of the conductor, and each group has a uniform dimension.

The cross-sectional shape of the insulating coating 12 can be freely set by the shape of the outlet 51 of the extruder. That is, it is not limited to the case where the conductor 11 having an elliptical cross section as shown in FIG. 6 (a) has an elliptical cross section corresponding to that of the conductor 11 having a circular cross section as shown in FIG. 6 (b). In this case, the outer surface of the insulating coating 12 'is provided with a mark 12a' such as a groove or rib to indicate the posture of the conductor 11 having an oval cross section.

Even if the conductor 11 is a stranded wire, it can be formed in the same manner according to the above method.

〔The invention's effect〕

As described above, according to the present invention, it is possible to press-connect electric wires of a plurality of sizes to one type of press-connecting terminal, greatly reducing the type of press-connecting terminal and facilitating management.

Moreover, since the number of types is reduced, the pressure contact terminal can be easily selected, and the use is facilitated.

Further, since the types are reduced, the types of jigs for forming the pressure contact terminals can be reduced and the cost of the pressure contact terminals can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electric wire having an oval-shaped conductor in cross section and a pressure contact terminal before pressure welding, FIG. 2 is a sectional view of an electric wire having an oval-shaped conductor in cross section, and FIG. FIG. 3 is a diagram showing a pressure contact state between a pressure contact terminal and an electric wire having a conductor having an oval cross section, (a) shows a case where the conductor is a single wire, and (b) also includes a case where the conductor is a stranded wire. 4 (a), (b), and (c) are diagrams showing a process of pressure-welding an electric wire having a conductor having an oval cross-section to a pressure-contact terminal, and FIGS. 5 (a), (b), and (c) are cross-sections. The figure which shows the process of manufacturing the electric wire which has an elliptical conductor, FIG.6 (a), (b) is a perspective view which shows the Example of the electric wire which concerns on this invention, FIG.7 is a conventional electric wire and a pressure welding terminal. Fig. 8 is a perspective view of the state before pressure welding of Fig. 8, Fig. 8 is a diagram showing the pressure welding state of the pressure welding terminal and the conventional electric wire, (a) is the case where the conductor is a single wire, (b) is the same case when it is a stranded wire is there. 1 ... Electric wire, 11 ... Oval cross-section conductor, 12 ... Insulation coating, 2 ... Press contact terminal, 21 ... Press contact groove, 23 ... Press contact blade, a
...... Pressure groove width, b ... Short diameter dimension, c ... Long diameter dimension.

Continuation of the front page (56) Reference JP-A-51-99280 (JP, A) JP-A-51-99289 (JP, A) JP-A-51-104575 (JP, A) Actual development-Sho 54-64266 (JP , U) Actual opening Sho 56-82823 (JP, U) Actual opening Sho 60-50423 (JP, U) Actual opening Sho 62-137519 (JP, U) Actual public Sho 37-2760 (JP, Y1) Actual public Sho 37-2762 (JP, Y1)

Claims (4)

[Claims] 1. An electric wire for a pressure contact terminal, which comprises a plurality of kinds of electric wires for a pressure contact terminal, the conductor having the same minor diameter and an oval cross section, and an insulating coating layer provided around the conductor. 2. The electric wire for a pressure contact terminal according to claim 1, wherein the insulating coating layer is formed in an elliptical cross section so as to correspond to the conductor having an oval cross section. 3. An electric wire for a pressure contact terminal according to claim 1, wherein the insulating coating layer is formed into an elliptical cross section, and the surface of the insulating coating layer is provided with an indication indicating the direction of the length and the minor axis of the conductor. 4. A press-fitting blade for press-fitting an insulating coated electric wire having a conductor having an oval cross-section having a major diameter dimension and a minor diameter dimension into a pressure-contact groove of a pressure-contact terminal, the minor-diameter side of the conductor being the pressure-contact blade of the pressure-contact groove. A structure for connecting a pressure contact terminal and an electric wire, which is characterized in that it is formed by contacting with a wire.