JP3583017B2 - Shielded wire terminal treatment structure and shielded connector - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shielded wire terminal processing structure and a shielded connector.
[0002]
[Prior art]
FIG. 7 shows one of the conventional shielded wire termination structures. As shown in the figure, a terminal fitting 3 is fixed to the exposed core wire 2 at the end of the shielded electric wire 1, and a barrel portion 6 provided integrally with the shield shell 5 is formed on a similarly exposed shield layer 4 by a tool. It is crimped. Then, a terminal portion of the shielded electric wire 1 is attached to a shield connector (not shown).
Such a device is disclosed in Japanese Patent Application Laid-Open No. 7-245153.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional terminal processing structure of the shielded wire, in order to crimp the barrel portion 6, the exposed length of the shield layer 4 must be secured, and the terminal processing portion of the shielded wire 1 becomes longer as a whole, As a result, there is a problem that the length of the shield connector is also increased. Even if the barrel portion 6 is strongly caulked against the shield layer 4, the internal insulating layer 7 inside the shield layer 4 is creeped and deformed with the passage of time so that the contact pressure between the barrel portion 6 and the shield layer 4 is reduced. It weakened and the connection reliability was not sufficiently obtained.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shielded wire terminal processing structure and a shielded connector that can make a terminal portion of the shielded wire compact.
[0004]
[Means for Solving the Problems and Functions / Effects]
<Invention of claim 1>
The terminal treatment structure of the shielded wire according to the invention of claim 1 is a terminal treatment structure of a shielded wire for electrically connecting a shield layer exposed at a terminal portion of the shielded wire and a shield shell covering the terminal portion of the shielded wire, A pair of holding plates hold the exposed portion of the shield layer in a state of being protruded from the shielded wire in a flange shape with the exposed portion interposed therebetween, and these holding plates are fixed to each other. It is characterized by being in contact with
According to this configuration, since the shield shell and the shield layer are connected by holding the exposed portion of the shield layer in a flange shape by the holding plate, the connection portion becomes compact in the axial direction of the shielded electric wire. Further, unlike the conventional one, there is no need to worry about creep deformation of the shielded wire, and the reliability of the connection is improved. Further, since the holding plates are fixed to each other with the collar-shaped shield layer interposed therebetween, the holding plate has a shape holding ability in this state, and even a soft shield layer can be reliably brought into contact with the shield shell.
[0006]
<Invention of Claim 2 >
According to a second aspect of the present invention, in the second aspect, a surrounding wall is provided which protrudes from a peripheral portion of one of the holding plates and surrounds the other holding plate, and an outer peripheral surface of the surrounding wall is provided on an inner peripheral surface of the shield shell. It is characterized by its close contact.
In this configuration, since the surrounding wall is provided on the holding plate and the peripheral surfaces of the surrounding wall and the shield shell are brought into close contact with each other, a large conductive area can be secured, and the connection is stabilized.
[0007]
<Invention of Claim 3 >
According to a third aspect of the present invention, in any one of the first and second aspects, the holding plate is welded together with the shield layer.
According to this configuration, the shield layer and the holding plate are welded to each other, so that the conductive connection is reliably performed.
[0008]
<Invention of Claim 4 >
A shielded connector according to a fourth aspect of the present invention provides a connector housing for holding a terminal fitting fixed to a shielded wire, a shield shell for covering the terminal fitting, and a shield layer exposed at a terminal portion of the shielded wire. Since the portion for conducting connection with the shield shell is provided with the shielded wire terminal treatment structure according to any one of claims 1 to 3 , the connection portion between the shield layer and the shield shell is formed by the shaft of the shielded wire. The connector becomes compact in the direction, and the size of the entire connector can be reduced.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
<First embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the shielded electric wire 10 includes a core wire 11, an inner insulating layer 12, a shield layer 13, and an outer coating 14 from the axial center side. The inner insulating layer 12 and the shield layer 13 are sequentially exposed from the tip side.
[0010]
As shown in FIG. 2, the shield connector 20 of the present embodiment includes a cavity 23 inside a connector housing 22 (hereinafter, referred to as “housing 22”) having a cylindrical hood portion 21 at the tip. A terminal fitting 24 fixed to the core wire 11 of the shielded electric wire 10 is accommodated in the cavity 23, and a distal end portion 24 </ b> A of the terminal fitting 24 protrudes forward from a deep portion of the hood 21. In addition, between the terminal fitting 24 and the cavity 23, a not-shown locking mechanism for preventing the terminal fitting 24 from coming off is provided.
[0011]
A cylindrical shield shell 25 is inserted into the housing 22 at a position surrounding the cavity 23. The terminal structure of the shielded wire according to the present invention is applied to a conductive connection portion between the rear end of the shield shell 25 and the shield layer 13 of the shielded wire 10. That is, the first holding plate 31 and the second holding plate 32 are attached to a portion of the shielded electric wire 10 facing the rear end of the shield shell 25. The first holding plate 31 is formed, for example, by punching a metal plate into a donut plate shape as shown in FIG. 1, and has a center hole 31A having a diameter that allows the internal insulating layer 12 of the shielded electric wire 10 to be inserted exactly. I have. On the other hand, the second holding plate 32 is formed, for example, by punching a metal plate into a donut plate shape having an outer diameter equal to that of the first holding plate 31, and drawing the cylindrical portion 33 from the edge of the center hole 32A of the donut portion 34. To form a protruding structure. The inner diameter of the cylindrical portion 33 has a diameter that allows the outer sheath 14 of the shielded wire 10 to be inserted therethrough.
[0012]
As shown in FIG. 2, a rubber plug 35 that is in close contact with both the housing 22 and the outer coating 14 of the shielded electric wire 10 is inserted into the rear end of the housing 22, and the rubber plug 35 is retained by a rubber plug retainer 36. Have been.
[0013]
Next, a process of attaching the shield connector 20 of the present embodiment to the shield wire 10 will be described. First, a rubber stopper 36 and a rubber stopper 35 are inserted through the shielded electric wire 10, and further, the second holding plate 32 is inserted through the distal end side of the cylindrical portion 33 so as to be fitted to the outer coating 14 of the shielded electric wire 10 (FIG. 3). Due to the fitting of the cylindrical portion 33 and the outer covering 14, the donut portion 34 of the second holding plate 32 is regulated so as not to fall down, and is held in a state of protruding laterally from the shielded electric wire 10. Then, the exposed portion of the shield layer 13 of the shielded electric wire 10 is spread in a flange shape as shown in the same figure, and then the first holding plate 31 is inserted through the shielded electric wire 10 as shown in FIG. , 32 between the flange portions 13A of the shield layer 13.
[0014]
Next, in order to hold the shield layer 13 sandwiched between the two holding plates 31 and 32, for example, laser light is irradiated from the first holding plate 31 side to partially melt the shield layer 13, and the shield layer 13 is placed on the second holding plate 32 side. 13 and welded together.
[0015]
Next, the terminal fitting 24 is crimped to the core wire 11 of the shielded electric wire 10, and the terminal fitting 24 is inserted into the cavity 23 of the shield connector 20. Then, the terminal fitting 24 is prevented from falling into the cavity 23 by a locking mechanism (not shown), and the outer peripheral surfaces of both the holding plates 31 and 32 and the inner peripheral surface of the shield shell 25 are brought into close contact with each other. The electric wire 10 is conductively connected to the electric wire 10 via the holding plates 31 and 32. Then, the rubber stopper 35 and the rubber stopper 36 are pushed into the housing 22 to complete the assembly of the shield connector.
[0016]
As described above, according to the present embodiment, the shield shell 13 and the shield layer 13 are connected by holding the exposed part of the shield layer 13 in a flange shape by the holding plates 31 and 32. The shield connector is made compact in the axial direction, and the overall size of the shield connector is reduced. Further, since the holding plate is welded together with the shield layer 13, there is no need to worry about creep deformation of the shielded electric wire 10 as in the conventional case, and the connection reliability is improved.
[0017]
<Second embodiment>
This embodiment is shown in FIG. 5, and is different from the first embodiment only in the structure of the peripheral portion of the first holding plate 31 and the structure of the rear end of the shield shell 25. Other configurations are the same as those of the first embodiment, and therefore, the same configurations are denoted by the same reference numerals, and redundant description will be omitted. Only different configurations will be described below.
[0018]
The first holding plate 31 of the present embodiment has a structure in which a hood-shaped surrounding wall 41 protrudes from a peripheral portion thereof. The surrounding wall 41 slightly expands in a tapered shape toward the open end side to surround the second holding plate 32, and the outer peripheral surface of the surrounding wall 41 has a tapered portion 42 formed at the rear end of the shield shell 25. In close contact with the inner peripheral surface of
[0019]
The assembly of this embodiment is as follows. In other words, the shield layer 13 is made to face the donut portion 34 of the second holding plate 32 with the flange-shaped shield layer 13, and the first holding plate 31 is inserted through the shielded electric wire 10 with the open end side of the surrounding wall 41 first. Then, the second holding plate 32 is accommodated in the inner part of the surrounding wall 41, and the shield layer 13 is sandwiched between the two holding plates 31, 32. Then, the holding plates 31 and 32 are welded in the same manner as in the first embodiment.
[0020]
Next, the shielded electric wire 10 is inserted into the shield shell 25 from the rear end. Here, since the rear end of the shield shell 25 is expanded by the tapered portion 42, the insertion operation can be easily performed. Then, the outer peripheral surface of the surrounding wall 41 of the first holding plate 31 is in close contact with the inner peripheral surface of the tapered portion 42 of the shield shell 25, and the shield layer 13 and the shield shell 25 are electrically connected. As described above, in the present embodiment, since the surrounding wall 41 is provided on the first holding plate 31 and the peripheral surfaces of the surrounding wall 41 and the shield shell 25 are brought into close contact with each other, a large conductive area can be secured, and the connection is stable. I do.
[0021]
<Other embodiments>
The present invention is not limited to the embodiments described above with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention. Can be implemented with various modifications.
[0022]
(1) In the first and second embodiments, the shield layer 13 is sandwiched between the pair of holding plates 31 and 32. However, in the first embodiment, the second holding is performed without providing the first holding plate 31. Only the plate 32 may be provided, and the shield layer 13 may be fixed to the second holding plate 32 with, for example, a conductive adhesive.
[0023]
(2) In the second embodiment, the holding plates 31 and 32 are fixed by welding so that the shield layer 13 is interposed therebetween. For example, as shown in FIG. A portion 43 may be provided, and the holding plates 31 and 32 may be fixed by locking the locking protrusion 43.
[Brief description of the drawings]
FIG. 1 is a perspective view of a shielded electric wire and a holding plate according to a first embodiment of the present invention. FIG. 2 is a side sectional view of a shielded connector. FIG. 3 is a side view showing a state where a second holding plate is attached to the shielded electric wire. FIG. 4 is a side sectional view showing a state where both holding plates are attached to a shielded electric wire. FIG. 5 is a side sectional view showing a shield connector according to a second embodiment. FIG. 6 is a side sectional view showing a modification. FIG. Perspective view showing the wire termination structure.
DESCRIPTION OF SYMBOLS 10 ... Shield electric wire 13 ... Shield layer 20 ... Shield connector 22 ... Connector housing 23 ... Cavity 24 ... Terminal fitting 25 ... Shield shell 31 ... First holding plate 32 ... Second holding plate 33 ... Cylindrical part 34 ... Doughnut part 41 ... Enclosure wall

Claims (4)

In a shielded wire terminal treatment structure for electrically connecting a shield layer exposed at a terminal portion of a shielded wire and a shield shell covering the terminal portion of the shielded wire, an exposed portion of the shield layer is sandwiched by a pair of holding plates. Characterized in that the holding plate is held in a state of being protruded from the shielded wire in a flange shape, the holding plates are fixed to each other, and the holding plate or the shield layer is brought into contact with the shield shell. Terminal processing structure. 2. The device according to claim 1, further comprising: a surrounding wall protruding from a peripheral portion of the one holding plate and surrounding the other holding plate, and an outer peripheral surface of the surrounding wall is closely attached to an inner peripheral surface of the shield shell. A terminal treatment structure for a shielded electric wire. The terminal holding structure for a shielded electric wire according to claim 1, wherein the holding plate is welded together with the shield layer . A connector housing for holding a terminal fitting fixed to the shielded wire, and a shield shell for covering the terminal fitting are provided, and a shield layer exposed at a terminal portion of the shielded wire and a portion for electrically connecting the shield shell to the shield layer. A shielded connector comprising the shielded wire terminal treatment structure according to any one of claims 1 to 3 .

Images