JPH11297384A - Shield wire connection structure and connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and easily connect a fabricated part of a shield wire to a shielded grounding terminal. SOLUTION: In this structure for inserting a braided part 2 of a shield wire 1 from a split opening 6 in a circular part 4 of a terminal 3, a catching pawl 5 to the braided part 2 is protruded on the inner side of the circular part 4. The catching pawl 5 is protruded toward the split opening 6. Plural catching pawls 5 may be arranged in steps or in a zigzag form. Such a constitution includes a shielded grounding terminal to be installed on a connector housing, and a terminal at an end of the shielded wire 1, the shielded grounding terminal comprises a base plate part to be fixed to the connector housing, a bending part continuous with the base plate part, and a circular part 4 continuous with the bending part, and the circular part 5 is bent from the bending part to be engagable with the braided part of the shield wire through the split opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded wire connection structure and a connection method capable of securely and easily connecting a braided portion of a shielded wire to an annular portion of a shield ground terminal.

[0002]

2. Description of the Related Art FIGS. 11 to 12 show an example of a conventional shielded wire connection structure (connection method) (Japanese Patent Laid-Open No. 7-73948).
No.). In this structure (method), as shown in FIG. 11, the outer covering 56 is peeled off at the intermediate portion of the shielded electric wire 55 to expose a braided portion (braided wire) 57 which is a conductor for shield ground, and the braided portion 57 is shielded. An annular terminal 58 for grounding is fitted, and the terminal 58 is fixed to a vehicle body 59 and the like with a bolt 62 and grounded as shown in FIG. Reference numeral 60 denotes an internal conductor, and 61 denotes a protector for inserting a wire harness (not shown).

However, in the above-described conventional structure (method), although there is no problem when the braided portion 57 is tightened with the bolt 62, as shown in FIG. Shrink to braid 57
There is a concern that a gap 64 is formed between the terminal and the terminal 58, and the electrical contact is deteriorated. Further, in a structure in which the elastic force (restoring force in the diameter-reducing direction) of the annular terminal (58) comes into contact with the braided portion 57 of the shielded electric wire 55 without depending on the tightening of the bolt 62, other than the temporal change of the shielded electric wire 55 In addition, there is a concern that the elastic force of the terminal (58) is weakened, a gap (64) is generated between the terminal (58) and the braided portion 57, and electrical contact is deteriorated.

FIGS. 14 (a) and 14 (b) show another example of a conventional shielded wire connection structure (connection method).
According to this structure (method), the inner wire 66 is exposed at the end of the shielded wire 65, the braid 67 is twisted and connected to the ground wire 68, and the tubular body 69 is inserted into the end of the shielded wire 65. Then, the braided portion 67 is sandwiched between the tubular body 69 and the coating 70.

[0005] The braid 67 is connected to a ground wire 68 by a crimp terminal 71.
It is connected to the. A female terminal 72 is crimped to the ends of the ground wire 68 and the internal electric wire 66. As shown in FIG. 15, each terminal 72 is a connector housing 73 made of synthetic resin.
In the terminal receiving chamber 74.

However, in the above-mentioned conventional structure (method), the braided portion 67 is twisted, the crimp connection is made to the terminal 71 of the ground wire 68, or the internal electric wire 66 is separated from the ground wire 68 to form a cylindrical body. It takes a lot of trouble to insert the tubular body 69 into the end portion of the shielded wire 65 by inserting the tubular body 69 into the end portion of the shielded wire 65, and the operation is very troublesome. Further, there is a concern that the braided portion 67 is easily cut when the braided portion 67 is twisted and pressure-bonded, and the grounding property (shielding effect) may be reduced by half.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems in the prior arts, and has been developed in consideration of the aging of the shielded wire and the deterioration of the elastic force of the shielded ground ring terminal. It is an object of the present invention to provide a connection structure and a connection method of a shielded electric wire which can perform the connection operation between a braided portion and a terminal easily and reliably without deteriorating the contact property with the wire.

[0008]

In order to achieve the above object, the present invention relates to a shielded wire connection structure in which a braided portion of a shielded wire is inserted into the annular portion of a terminal from a slit opening of the annular portion. The hook is formed on the inside of the annular portion so as to protrude from the braided portion (claim 1). It is also effective that the hook claws protrude toward the slit opening (claim 2). It is also effective that the plurality of hook claws are arranged stepwise or in a staggered manner. Also, a terminal portion for a shield ground mounted on the connector housing, and a terminal of a terminal of a shielded wire inserted into the connector housing, wherein the terminal for the shield ground is fixed to the connector housing and a substrate portion. Having a bendable portion following the substrate portion and an annular portion following the bendable portion, wherein the annular portion is bent from the bendable portion and can be fitted to a braided portion of the shielded electric wire from a slit opening. (Claim 4). The said annular part is Claim 1.
It is also effective to have the hook claw according to any one of (1) to (3). Further, the terminal portion of the shielded ground terminal is fixed to the connector housing, the terminal of the shielded electric wire is inserted into the connector housing, and the annular portion following the substrate portion is directed toward the braided portion of the shielded electric wire. A method of connecting a shielded wire in which the annular portion is fitted to the braided portion from the slit opening by bending is adopted (claim 6).

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show one embodiment of a connection structure of a shielded electric wire according to the present invention. As shown in FIG. 1, a braided portion (braided wire) 2 is exposed at an intermediate portion of the shielded electric wire 1, and a shield grounding terminal 3 for radially inserting the braided portion 2 has a plurality of connection annular portions 4. Are formed so as to protrude inward.

A part of the annular portion 4 in the circumferential direction is cut off,
A slit opening 6 for insertion into the braid 2 is provided.
A tapered guide portion 7 is formed at one end of the annular portion 4 following the slit opening 6, and a tab-like grounding connector 8 is formed at the other end of the annular portion 4 so as to protrude outward. An insertion hole 9 is formed.

As shown in FIG. 2, each hook 5 protrudes toward a slit opening 6 (the direction in which the braid 2 is inserted).
That is, each hooking claw 5 is formed and arranged symmetrically with respect to a half position (a position on the opposite side to the slit opening 6) of the circumferential length of the annular portion 4, and the inner peripheral surface of the annular portion 4. The hook 5 protrudes along the hook 4 a, and the tip 5 a of each hook 5 is located toward the end of the annular portion 4 on the near side, that is, toward the slit opening 6.

Each hooking claw 5 is formed by cutting and raising the annular portion 4 with, for example, a punch and a die. As shown in FIG.
The punching hole 10 is raised from the edge farthest from the slit opening 6, protrudes in a substantially triangular shape, and is formed to be slightly outwardly curved as shown in FIGS. It is sharply pointed. As shown in FIG. 2, it is preferable that the tip 5a of each hook 5 is formed gradually thinner.

In the present embodiment, six hooking claws 5 are symmetrically arranged three by three near each end (slit opening 6) of the annular portion 4. Each hooking claw 5 is disposed closer to the guide portion 7 and closer to the grounding connector 8, and the hooking claw 5 is not disposed on the bottom side of the annular portion 4 opposite to the slit opening 6. This is to ensure that each hook 5 rakes up the braid portion 2 when the braid portion 2 is inserted into the annular portion 4 from the slit opening 6 as described later.

As shown in FIG. 1, the braided portion 2 of the shielded electric wire 1 is joined to the annular portion 4 along the guide portion 7 of the terminal 3 and the grounding connector 8.
Will be guided inside. At this time, as shown in FIG. 2, the annular portion 4 is expanded outward, the slit opening 6 is enlarged, and the braided portion 2 is inserted into the annular portion 4. At the same time, each hook 5 protruding toward the slit opening 6 is connected to the braided portion 2 as shown in FIGS.
And the braided portion 2 is raked (converged) along the surface of the inner coating 11 of the shielded electric wire 1 and held up by being picked up. At the same time when the braided portion 2 is inserted into the annular portion 4, the annular portion 4 is restored to a perfect circle by a spring force.

Since each hook 5 is slightly curved outward, a part of the braided portion 2 is securely held and held. Note that the hooking and holding operation of the braided portion 2 is possible even if the hooking claws 5 are not curved outward.

Since the braid 2 is held so as to be hooked on the inside of the hook 5, even if the inner coating 11 contracts with the passage of time, a gap 12 (see FIG. 3) is formed between the braid 2 and the annular portion 4. ) Occurs, the electrical contact between the braided portion 2 and the hook 5 does not change at all.
The electrical connection between the terminal and the terminal 3 is kept good.

In the state shown in FIG. 3, the ground connector 8 is connected and fixed to a vehicle body or the like by bolts (not shown). In this example, the guide portion 7 is not fixed, but may be bolted integrally with the grounding connector 8.

It is preferable that a plurality of hooking claws 5 are arranged on the annular portion 4, but even if there is only one, there is no change in operation. In this embodiment, the plurality of hooking claws 5 are
Are arranged in series (one line) in the circumferential direction at the center in the width direction.

Even when the hook 5 does not protrude toward the slit opening 6 (FIG. 2), after the braided portion 2 is inserted into the annular portion 4, the annular portion 4 is moved in the circumferential direction of the braided portion 2. By rotating, the braided portion 2 can be hooked on the hooking claw 5 and converged.

FIGS. 5 and 6 show terminals 1 for shield ground.
5 shows an embodiment in which a plurality of hooking claws 5 are arranged in a zigzag pattern on an annular portion 4 of FIG. In this example, the same parts as those in the previous example will be described using the same reference numerals, and at least two hook claws 5 are required. When there are two hook claws 5, the upper two hook claws 5 ₁ and 5 _{2 in FIG.} As shown in FIG.

By arranging a plurality of hooking claws 5 in a staggered or staggered manner, for example, a second hooking claw 5 ₂ can be moved to a different position from the region where the first hooking claw 5 ₁ (FIG. 6) converges. There converge, the second hooking pawl 5 ₂ another site remote from the site of converged (first hooking portion far away from the site where the pawl 5 ₁ converges) the third hooking pawl 5 ₃ Converge.

That is, the braid 2 (FIG. 1)
Hanging claw 5₁The first pull
Claw 5₁The first hook claw 5₁
If there is a hook (not shown) directly under (nearest)
Indicates that the braid 2 (FIG. 1) is less likely to be caught,
According to the configuration of this example, there is no need to worry ₁
~ 5_ThreeThe braid 2 (Fig. 1) is securely and uniformly hooked
And the contact between the braided portion 2 (FIG. 1) and the annular portion 4
Is improved.

As shown in FIG. 5, the hooking claws 5 are arranged not rotationally symmetrically but rotationally symmetrically on the guide portion 7 side of the annular portion 4 and the grounding connector 8 side. With this configuration, the braided portion 2
(FIG. 1) is brought into contact with the annular portion 4 uniformly. Note that the shape of the hook claw itself is the same as that of the previous example, and a description thereof will be omitted. Each of the above embodiments is effective not only as a connection structure of a shielded wire, but also as a method of connecting a shield ground terminal and a shielded wire.

FIGS. 7 to 10 show a shielded wire connector to which the above-mentioned shield ground terminal is applied, and this configuration is effective as a shielded wire connection structure and connection method.

In FIG. 7, a female terminal 20 is provided on the inner conductor 19 at the end of the shielded electric wire 18 with a crimping piece 21 on the front side.
The female terminal 20 is inserted into the terminal accommodating chamber 23 of the male connector housing 22 made of synthetic resin. The female terminal 20 has an elastic contact piece 25 with the male terminal 24 on the other side. The outer covering 26 of the shielded electric wire 18 is fixed by crimping with a crimping piece 27 on the rear side of the terminal 20, and the outer covering 26 is peeled off behind the crimping piece 27 on the rear side to expose a braided portion (braided wire) 28, Braid part 28
The annular portion 31 of the shield grounding terminal 30 is fitted and connected to the terminal.

The annular portion 31 has a hook 32 similar to the previous example.
It is needless to say that is formed. In this example, the hooking claws 32 are arranged in a left-right pair in parallel. The shape of the hook 32 is the same as in the previous example, and a description thereof will be omitted.

As shown in FIG. 8 (a view as viewed from the bottom side in FIG. 7), the shield ground terminal 30 of this embodiment can be bent to a horizontal board portion 33 and a rear end of the board portion 33. It has a continuous bendable portion 34 and the annular portion 31 following the bendable portion 34. The board portion 33 includes a flexible lock piece 35 for the male connector housing 22 and an elastic contact piece 38 for a shield conductive plate 37 (FIG. 7) mounted on the mating female connector housing 36 (FIG. 7). It is integrally formed by cutting and raising. The lock piece 35 is formed near the front end of the board 33, and the elastic contact piece 38 is formed near the center of the board 33. Split opening 3 of annular part 31
On both sides of 9, a tapered guide portion 40 is formed so as to protrude.

As shown in the dashed line in FIG. 7 and in FIG. 8, the bendable portion 34 extends in the longitudinal direction of the substrate portion 33 before being connected to the ground, and bends at a right angle in the same direction as the protruding direction of the lock piece 35 and the elastic contact piece 38. And continues to the front end of the annular portion 31.
As shown in FIG. 8, the bendable portion 34 is formed to be narrower than the outer diameter of the annular portion 31, and can be bent at a right angle integrally with the annular portion 31 at a boundary 34 a with the substrate portion 33.

The annular portion 31 is connected to the boundary 3 with the substrate portion 33.
The bending may be performed not at 4a but at the boundary 34b with the bendable portion 34. In this example, since there is a gap between the substrate 33 and the braided portion 28 in FIG. If there is no gap, the bendable part (34) is raised from the substrate part 33 at a right angle, and the bendable part (34) is raised.
The annular portion 31 may be extended in the same direction as the above. In this example, there is a gap in the length of the bendable portion 34 and the bending point (34)
a) is away from the shielded electric wire 18, the annular portion 31 rotates with a large rotation radius, and the braided portion 28
1 fits smoothly.

As shown in FIG. 8, the bottom wall 41 of the male connector housing 22 has a slide engagement portion 42 for the board portion 33.
Are formed integrally, and the lock pieces 3 are
5 and a holding groove 44 for the elastic contact piece 38 are formed. By inserting the board portion 33 into the slide engagement portion 42 from behind, the tip of the lock piece 35 contacts the terminal end 43a of the engagement groove 43 as shown in FIG.
The elastic contact piece 38 projects from the holding groove 44 and comes into contact with the shield conductive plate 37 on the female connector housing 36 (FIG. 7) side. Terminal 3 before earth connection in FIG.
The 0 annular portion 31 projects from the male connector housing 22 at a right angle.

After the board portion 33 of the terminal 30 is inserted into the male connector housing 22 as shown in FIG. 9, the female terminal 20 (FIG. 7) of the shielded electric wire 18 is connected as shown in FIG. 10 (an inverted view of FIG. 9). It is inserted into the male connector housing 22. The female terminal 20 is locked by a flexible locking lance 45 (FIG. 7).

Next, as shown in FIG.
Is bent (rotated) by 90 ° from the root of the bendable portion 34 (boundary 34a in FIG. 7) in the lifting direction as shown by the arrow A, and the braided portion 28 of the shielded electric wire 18 is inserted into the annular portion 31. At the same time as the insertion of the braided portion 28, the hook 32 (FIG. 7) of the annular portion 31 pierces the braided portion 28, and converges and holds a part of the braided portion 28 as in the previous example. As a result, reliable contact between the annular portion 31 and the braided portion 28 without change over time is possible.

After connecting the annular portion 31 to the braid portion 28,
As shown in FIG. 7, the male connector 46 (male connector housing 22
(With the female terminal 20 inserted into the female connector 47). Male connector 46 at the same time as connector mating
Is fixed to the female connector 47 by a lock arm 48, and the male terminal 24 is connected to the elastic contact portion 25 of the female terminal 20. The shield conducting plate 37 is a female connector housing 36
The elastic contact piece 38 of the shield ground terminal 30 is connected to the exposed portion 37a in the first half.

The shield conducting plate 37 is connected to a warning circuit (not shown) such as a ground circuit of a vehicle body and a meter. The braided portion 28 of the shielded electric wire 18 is an annular portion 3
1 is connected to the shield conductive plate 37 through the elastic contact piece 38 of the board portion 33. If there is a shield abnormality, for example, a warning lamp is turned on to notify the driver of the abnormality.

In this embodiment, the hook 32 is shown in FIGS.
The embodiments described in the above embodiments can be applied. Further, the structure of this example can be applied to a shield ground terminal having no hook. After inserting the terminal 20 of the terminal of the shielded electric wire 18 into the male connector housing 22, the annular portion 31 of the terminal 30 for shield ground is rotated from the bendable portion 34 to be fitted and connected to the braided portion 28 of the shielded electric wire 18. By that
The connection operation of the shielded electric wire 18 can be easily and reliably performed with one touch. Thereby, the conventional (FIG. 14)
This eliminates the need for twisting the braided portion and crimping the terminal to the ground wire, and eliminates the need for crimping terminals and reduces the number of components. The above configuration is also effective as a method for connecting shielded wires.

[0036]

As described above, according to the first aspect of the present invention, the braided portion of the shielded wire is inserted into the annular portion of the terminal, and at the same time, the hooking claws of the annular portion converge so as to collect the braided portion. Even if the inner covering of the shielded wire contracts due to aging over time and a gap is created between the annular portion and the braided portion, the hook claws ensure electrical contact with the braided portion, and The deterioration of the grounding property is prevented. Further, according to the second aspect of the present invention, the braid portion is securely inserted into the hook at the same time as the braid portion is inserted into the annular portion from the slit opening, and the effect of the first aspect is reliably exhibited. According to the third aspect of the present invention, even when the braided portion is raked by the adjacent hooking claws and deflected, the intervals between the hooking claws are wide, so that the hooking claws surely scrape the braided portion. And the reliability of the shield grounding property is improved. According to the fourth and sixth aspects of the present invention, after the terminal of the terminal of the shielded wire is inserted into the connector housing, the annular portion is bent from the board portion, so that the annular portion is in one-touch with the braided portion of the shielded wire. The connection work between the braided portion and the shield ground terminal is facilitated. According to the fifth aspect of the present invention, the connection between the braided portion and the shield grounding terminal is reliably performed as in the first to third aspects.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of a connection structure of a shielded electric wire according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state where a braided portion of a shielded electric wire is inserted into an annular portion of a terminal.

FIG. 3 is a longitudinal sectional view showing a state where each hook claw is engaged with a braid portion.

FIG. 4 is a view showing a state in which the hook claws converge on the braid portion.
FIG.

FIG. 5 is a perspective view showing another embodiment of a shield ground terminal.

FIG. 6 is a side view showing the terminal.

FIG. 7 is an exploded perspective view showing an application example of a connection structure of a shielded electric wire.

FIG. 8 is an exploded perspective view showing a state where a terminal for shield ground is inserted into the connector housing.

FIG. 9 is a perspective view showing a state where terminals are inserted into the connector housing.

FIG. 10 is a perspective view showing a state where the annular portion of the terminal is bent and fitted to the braid portion of the shielded electric wire.

FIG. 11 is an exploded perspective view showing a conventional example.

FIG. 12 is a longitudinal sectional view showing a state in which a terminal for a shield ground is fixed.

FIG. 13 is a longitudinal sectional view showing a conventional problem.

14A and 14B show another conventional example, in which FIG. 14A is an exploded perspective view before assembling, and FIG. 14B is a perspective view after assembling.

FIG. 15 is a perspective view showing a state where terminals are inserted into the connector housing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS _1, 18 Shielded electric wire 2, 28 Braided part ₃ , 30 Shield ground terminal 4, 31 Annular part 5, 51-53, 32 Hook claw 6, 39 Split opening 20 Terminal of terminal 22 Male connector housing 33 Board Part 34 bendable part

Claims (6)

[Claims] In a connection structure for a shielded electric wire in which a braided portion of a shielded wire is inserted into the annular portion from a slit opening of an annular portion of a terminal, a hook claw for the braided portion projects inside the annular portion. A connection structure for a shielded wire, wherein the connection structure is formed. 2. The shielded wire connection structure according to claim 1, wherein said hook claws protrude toward said slit opening. 3. The connection structure for a shielded electric wire according to claim 1, wherein the plurality of hooking claws are arranged in a stepped or staggered manner. 4. A terminal for shield ground mounted on the connector housing and a terminal of a terminal of a shielded wire inserted into the connector housing, wherein the terminal for shield ground is fixed to the connector housing. A substrate portion, a bendable portion following the substrate portion, and an annular portion following the bendable portion, wherein the annular portion is bent from the bendable portion and cuts into a braided portion of the shielded electric wire from a slit opening. A connection structure for a shielded electric wire, which can be fitted. 5. The connection structure for a shielded electric wire according to claim 4, wherein the annular portion has the hook claw according to any one of claims 1 to 3. 6. A terminal portion of a shielded earth terminal is fixed to a connector housing, a terminal of a terminal of the shielded electric wire is inserted into the connector housing, and an annular portion following the substrate portion is a braided portion of the shielded electric wire. And connecting the annular portion to the braided portion from the slit opening by bending toward the braided portion.