JPH0745312A - Crimp type connector - Google Patents

Abstract

PURPOSE:To provide a crimp type connector with a low contact resistance. CONSTITUTION:When a side of an electric wire is pressed down into a slit 21 of a peeling terminal 20 the cover layer of the wire is biten and cut by a cutting edge 26 at an open edge of the slit 21, and it enters the slit 21 under the biten conditions and reaches an opening piece 23 from a top piece. Since both opening piece 23 are widened left and right, the cut portion of the cover layer is pushed and widened to both sides by the pieces 23, and the cover layer is pulled and cut and divided, thereby exposing a conductor completely between the pieces 23. A contact part 32 of a contact terminal of U-shaped section 30 disposed between the pieces 23 is brought into contact with the side of conductor exposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure welding connector for connecting electric wires arranged in parallel.

[0002]

2. Description of the Related Art For example, in a wire harness in which a large number of electric wires are arranged to form a bundle of electric wires, electric wires arranged in parallel are formed by jointing some electric wires of the electric wire bundle in the middle of the route. A pressure contact connector is used to connect the two. As shown in FIG. 12, the press-connecting connector includes a housing 70 and a cover 71 that covers the opening 70 a of the housing 70.
Inside 0, a conductive pressure contact terminal 72 in which a thin plate is bent in an inverted U shape is installed. A plurality of slits 73 are formed in parallel from the upper surface of the press contact terminal 72 downward, and when the electric wire W is press-fit into each of the slits 73, the rim of the slit 73 is used as a cutting blade 74, which is shown in FIG. The coating layer a of the electric wire W is cut as shown in FIG.
Is exposed and the slit 7 is formed on the exposed conductor b.
Electrical contact is made with the edge surface of 3 as a contact portion.

[0003]

For this reason, in the pressure contact terminal 72 of this conventional example, a cutting blade 74 whose plate thickness surface (edge) cuts off the coating layer a of the electric wire W at the rim of the slit 73.
Therefore, the pressure contact terminal 72 is formed of a thin plate material. Further, since the contact portion that contacts the conductor b inside the slit 73 is also a plate thickness surface (edge), the contact area between the contact portion and the conductor b becomes small, and there is a problem that the contact resistance becomes large. It was

Further, since the slit width of the slit 73 is determined so that only the coating layer a is cut by the cutting blade 74 and the conductor b is not cut, when the conductor b is thinner than the slit width, The coating layer a cannot be cut completely, and the conductor b is not sufficiently exposed. For this reason, there is a possibility that the contact resistance may be further increased, or a contact failure may occur.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a press-connecting connector which has a small contact resistance by reliably contacting a conductor of an electric wire.

[0006]

In order to achieve the above object, in the invention of claim 1, the pressure contact terminal has an inverted Y-shaped cross section by an upper piece and an expanding piece that expands to the left and right continuously from the upper piece. The strip-shaped strip-shaped terminal is formed in a letter shape, and the contact terminal arranged between the spreading pieces, and the stripping terminal has a plurality of slits arranged in parallel from the upper piece to the spreading piece. The opening edge of each slit is a cutting blade that bites into the coating layer of the electric wire, and the contact terminal is provided with a contact portion that comes into contact with the conductor of the electric wire inserted in the slit.

[0007]

When the electric wire is press-fitted into the press-connecting connector of the first aspect of the invention and joined, the side surface of the electric wire is pushed down into the slit provided in the strip terminal. Then, the cutting edge provided at the opening edge of the slit bites into the coating layer of the electric wire and cuts it, and the electric wire further enters the slit in this biting state and reaches the expanding piece from the upper piece. The stripped terminal has an inverted Y-shaped cross section by the upper piece and the expanding piece, and since the expanding piece is expanded to the left and right, the cut portion of the coating layer is spread to both sides by both expanding pieces. Then, the covering layer is torn off and divided, so that the conductor between the two spreading pieces is completely exposed. Then, the contact portion of the contact terminal arranged between the spreading pieces contacts the side surface of the exposed electric wire of the conductor.
In this way, one electric wire is crimped, and then the next electric wire is subjected to a similar press-fitting operation in a plurality of slits formed in parallel. As a result, the plurality of pressure-welded electric wires are jointed.

[0008]

According to the first aspect of the present invention, the coating layer of the electric wire cut by the cutting blade bites into the slit, and the cut portion is further expanded by the spreading piece to expose the conductor across the width. However, since the exposed side surface of the conductor is brought into contact with the contact terminal, the conductor can be surely and sufficiently contacted, and the pressure contact connector with a small contact resistance can be obtained.

[0009]

【Example】

<Embodiment 1> Hereinafter, Embodiment 1 in which the pressure contact connector of the present invention is applied to a wire harness of an automobile will be described with reference to FIGS. As shown in FIG. 1, the press-connecting connector of the first embodiment is a box-shaped housing 1 having an open upper surface.
And a press-connecting terminal 2 installed in the housing 1, and a cover 4 detachably provided on the upper surface of the housing 1.

A plurality of opposing side walls of the housing 1 are provided at a plurality of opposing locations (six locations in the first embodiment).
The insertion grooves 11, 11 are cut out in parallel at equal intervals, and the projecting piece 12 having the guide surface 12a is provided at the opening edge thereof. As shown in FIGS. 2 and 3, a mounting base 13 is formed in a bulge shape at the center of the bottom of the housing 1.
11 and the mounting grooves 14 that are in line with each other. Further, as shown in FIG. 3, press-fitting grooves 15 for press-fitting a lower portion of a stripping terminal 20 to be described later are provided on both sides of the mounting base 13 in the longitudinal direction, and press-fitting holes 15 a are further formed in the bottom of the press-fitting grooves 15. Are formed. Further, a positioning projection 16 that engages with a positioning notch 33 of the contact terminal 30 which will be described later is formed on the upper surface of the mounting base 13 so as to project. An engaging protrusion 17 for locking the cover 4 is provided on the lower outer surface of the housing 1.

As shown in FIG. 1, the press contact terminal 2 is a contact terminal 30 made of a conductive strip-like plate bent substantially along the upper surface of the mounting base 13, and is stacked on the upper surface of the contact terminal 30. And a stripping terminal 20 which is also made of a conductive thin strip plate and is provided.

The stripping terminal 20 is formed by folding the center of a plate material in two, and is provided with an upper piece 22 that is folded 180 degrees from the bent edge and is in close contact with it. An expanding piece 23 is provided that is bent obliquely downward so as to spread in the direction of Y.
It is formed in the shape of a band and has a width H between the two expansion pieces 23, 23.
Gaps are formed. Further, in the expanding piece 23 of the first embodiment, the guide piece 24 bent further in parallel as the width H is further extended, and the press-fitting piece 25 is press-fitted into the press-fitting hole 15a at the center of the lower end of the guide piece 24. Is provided. Then, as shown in FIG.
The press-fitting piece 25 is press-fitted into the press-fitting hole 15a, and
It is fixed so as to straddle. The contact terminals 30 are pressed and fixed to the upper surface of the mounting base 13 by both ends of the expansion piece 23.

A plurality of slits 21 (six places in this embodiment) are formed in parallel in the stripping terminal 20 at equal intervals corresponding to the mounting groove 14. The slit 21 is cut out from the upper edge of the upper piece 22 to the guide piece 24, and the edge of the slit 21 has a widened inclination, and the edge surface of this inclination damages the coating layer a of the electric wire W. It is used as a cutting blade 26. The slit 21 is aligned with the insertion groove 11 of the housing 1, and when the electric wire W extending crossing the longitudinal direction of the housing 1 is pushed down from above the housing 1, the guide surface 12a is formed. The electric wire W guided by is arranged in the center of the insertion groove 11 and the slit 21, and then the cutting blade 26 bites into the coating layer a and linearly damages the coating layer a. The slit 21 has a slit width that is substantially the same as or slightly wider than the diameter of the conductor b of the electric wire W so that the conductor b is not damaged.

Further, the contact terminal 30 is, as shown in FIG.
A plurality of holding pieces 32 that are bent in a U shape corresponding to the slits 21 are provided. The holding groove 31 formed by the U-shaped holding piece 32 has a groove width slightly narrower than the slit width of the slit 21, and the electric wire W inserted in the slit 21.
The side surface of the conductor b is sandwiched by the sandwiching piece (contact portion) 32. The contact terminal 30 is
A positioning notch 33 provided between the sandwiching piece 32 and an adjacent sandwiching piece 32 is attached so as to engage with the positioning protrusion 16 and cover the upper surface of the mounting base 13.

As shown in FIG. 1, the cover 4 is formed in a cap shape so as to cover the upper surface and the side surface of the housing 1, and the side surface thereof is engaged with the engaging projection 17 of the housing 1. A hole 41 is provided. Also, the cover 4
An electric wire guide notch 42 for drawing out the electric wire W press-fitted into the housing 1 is provided at the lower edge of the.

Next, the operation of the first embodiment will be described. To construct a wire harness (not shown), the electric wire W to be jointed is selected from the arranged electric wire bundle and drawn out. And this selected wire W,
Arranged in a direction crossing the longitudinal direction of the housing 1,
The electric wire W is lowered after the positions thereof are aligned above the opposing insertion grooves 11, 11 to be inserted. Then, the electric wire W is on the guide surface 12
Guided by a, it is inserted into the insertion groove 11, 11 at the center position. At this time, as shown by the chain double-dashed line in FIG. 2, the electric wire W contacts the cutting blade 26 of the stripping terminal 20 arranged in the center of the housing 1. When the electric wire W is further pushed down in this state, the cutting blade 26 bites into the coating layer a, and the coating layer a of the electric wire W is cut on both the left and right sides in the radial direction. Enter inside (see Fig. 4). The left and right surfaces of the coating layer a of the electric wire W are cut so that the upper and lower surfaces are continuous, and the conductor b is exposed only on these left and right surfaces. At this time, if the conductor b is thinner than the groove width of the slit 21, the conductor b
The coating layer a is only partially cut without being exposed.

Further, when the electric wire W is pushed down along the slit 21 to reach the state of FIG. 5 from the state of FIG. 4 to the expanding piece 23 of FIG. 5, the edge of the slit 21 bites into the coating layer a. The covering layer a is pushed and spread in the length direction of the electric wire W by the two spreading pieces 23, 23. Then, the covering layer a is further spread to both sides by the expanding pieces 23, 23, and the covering layer a is completely torn and separated as shown in FIG. The side surface of the conductor b is completely exposed. Therefore, even when the coating layer a is not sufficiently cut, the edges of the slits 21 bite into the coating layer a, and when the spreading pieces 23 and 23 push the coating layer a to both sides, the coating layer a is completely removed. It is torn off and the side surface of the conductor b is exposed.

Further, when the electric wire W is pushed down along the slit 21 to the guide piece 24 to reach the state of FIG. 6, the conductor b is exposed by the width H with the expanding pieces 23, 23. In this state, the conductor b enters the holding piece 32 of the contact terminal 30 and both side surfaces of the conductor b exposed over the width H are held by the holding piece (contact portion) 32, and the conductor b makes sufficient electrical contact with the contact terminal 30. Is obtained.

When the above-described operation is sequentially performed on the electric wires W to be jointed, the inserted electric wires W are electrically connected to each other by the contact terminals 30. After mounting all the electric wires W to be jointed, as shown in FIG. 7, the housing 1 is covered with the cover 4, and the engaging projections 17 are engaged with the engaging holes 41 to be attached. At this time, the electric wire W is guided by the electric wire guide notch 42 so that the housing 1
Be pulled out of.

<Second Embodiment> Next, a second embodiment will be described with reference to FIGS. 8 and 9. Although the first embodiment shows an example in which the pressure contact terminal 2 is composed of two members, the peeling terminal 20 and the contact terminal 30, in the second embodiment, the pressure contact terminal 50 is composed of one member, and one of the pressure contact terminals 50. Since only the parts are different from the first embodiment, the same parts are designated by the same reference numerals, and the description thereof will be omitted.

The stripping terminal 51 of the pressure contact terminal 50 is the same as that of the first embodiment.
Similar to the stripping terminal 20, the center of the plate material is folded in two, and the upper piece 52, the expanding piece 53, and the guide piece 5
As shown in FIG. 8, the slits 21 are formed in parallel with each other, and the slits 21 are formed in parallel to form notches.

Then, as shown in FIG. 9, the guide piece 54
A rectangular window 55 is opened in the center. The window 55 is cut so as to form a double door, and the left and right sides are bent and opened. The portion corresponding to this door is bent so as to come into contact with the conductor b of the electric wire W accommodated between the slits 21 and 21, and the contact terminal piece 56 is formed at the tip thereof. Then, as shown in FIG. 9, both guide pieces 5
4 and the four contact terminal pieces 56 bent from the adjacent guide pieces 54, the side surfaces of the conductor b are sandwiched as the contact terminals 57 for sandwiching the conductor b. In the second embodiment, since the pressure contact terminal 50 is made of one plate material, the pressure contact terminal can be easily assembled.

The present invention is not limited to the above-described first embodiment or second embodiment, but can be implemented with the following modifications. (1) In the first embodiment, both the stripping terminal 20 and the contact terminal 30 are made of a conductive material. However, the stripping terminal 20 may be used as long as the contact terminal 30 can secure the electrical connection between the conductors b. It may be made of a non-conductive material.

(2) In the first and second embodiments, the strips 23 of the stripped terminal 20 are provided with the guide pieces 24, and the slits 21 are provided up to the guide pieces 24. It suffices that the side surface of the conductor b is exposed by the piece 23, and it is not always necessary to provide the slit 21 up to the guide piece 24.
When this structure is adopted, the contact terminal 30 shown in the first embodiment is provided further up and contacts the conductor b.

(3) In the first embodiment, the conductor b and the contact terminal 3
Although the electrical contact with 0 is made by sandwiching by the sandwiching piece 32, it is not always necessary to sandwich it, and it may be a contact portion that contacts only one side of the conductor b.

(4) In the second embodiment, the contact terminal 57 of the press contact terminal 50 is formed by bending the contact terminal piece 56 to the left and right so as to open the double door, but, for example, as shown in FIG. Two windows 55a may be formed on the right side and the left side of the guide piece 54 on one side, and the bent contact terminal pieces 56a may be provided on the adjacent slits 21 side.

Further, as shown in FIG. 11, the contact terminal piece 57c extending from the window 55b formed in the guide piece 54 on one side and the contact terminal piece 57c on the other side facing the contact terminal piece 57c are provided adjacent to each other. Contact terminal piece 57 extending from the opened window 55c
It is also possible to form a contact portion in which d is provided so as to face each other and the conductor b is sandwiched between the contact terminal pieces 57c and 57d.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a first embodiment.

FIG. 2 is a partial vertical sectional view of the same.

FIG. 3 is a vertical cross-sectional view taken along line III-III in FIG.

FIG. 4 is a vertical sectional view taken along line IV-IV of FIG. 2, showing a state in which an electric wire is cut.

FIG. 5 is an explanatory diagram showing a state in which the conductor is exposed in FIG. 4;

FIG. 6 is an explanatory diagram showing a state at the end of press fitting in FIG. 4;

FIG. 7 is an explanatory diagram showing a state in which a cover is attached in FIG.

FIG. 8 is a perspective view of a part of the press contact terminal according to the second embodiment.

FIG. 9 is a partial plan sectional view of the same.

FIG. 10 is a partial plan cross-sectional view showing another example.

FIG. 11 is a partial plan cross-sectional view showing another example.

FIG. 12 is an isolated perspective view showing a conventional example.

FIG. 13 is a partial plan sectional view showing a problem of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Press-contact terminal 20 ... Stripping terminal 21 ... Slit 22 ... Upper piece 23 ... Expanding piece 26 ... Cutting blade 30 ... Contact terminal 32 ... Clamping piece (contact part) W ... Electric wire a ... Coating layer b ... Conductor

Claims (3)

[Claims] 1. A press-fitting electric wire is provided with a press-contact terminal which is cut out of a coating layer of the press-fitting wire to expose a conductor and which is in contact with the exposed conductor. In the press-connecting connector for jointing, the press-connecting terminal includes a strip-shaped strip terminal having an inverted Y-shaped cross section by an upper piece and an expanding piece that expands to the left and right continuously from the upper piece, and the expanding piece. And a plurality of slits are formed in parallel on the stripping terminal from the upper piece to the spreading piece, and the opening edge of each slit bites into the coating layer of the electric wire. A press contact connector, which is a cutting blade, and in which the contact terminal is provided with a contact portion that comes into contact with a conductor of an electric wire inserted in the slit. 2. The press-connecting connector according to claim 1, wherein the press-connecting terminal is composed of separate members for the stripping terminal and the contact terminal. 3. The press-connecting connector according to claim 1, wherein the press-connecting terminal has a stripping terminal and a contact terminal which are formed of one member.