JP4087269B2 - Shielded wire terminal processing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield wire terminal processing structure applied to a shield connector for connecting a shield wire for a wire harness routed in an automobile or the like.
[0002]
[Prior art]
Conventionally, what is shown in FIG. 3 is known as an example of this type of shielded wire terminal processing structure. This terminal processing structure is composed of a small-diameter shield layer gripping portion 6A and a large-diameter seal portion 6B, and is a cylindrical rubber plug formed of conductive rubber fitted on the outer sheath 5 of the end of the shielded electric wire 1. 6 and a shield layer folded portion 4A formed by folding back the free end side of the shield layer 4 in the core wire 2, the insulation coating layer 3 and the shield layer 4 exposed by stepping off the end of the shielded electric wire 1 In the shield wire terminal processing structure, including a metal fixing member 7 for fixing the rubber plug 6 to the outer sheath 5 of the shielded electric wire 1. Is fitted through a metal inner fixing ring 8 that is directly fitted on the outer sheath 5 of the shielded electric wire 1, a shield layer folded portion 4 A that is sequentially placed thereon, and a shield layer gripping portion 6 A of the rubber plug 6. Metal exterior fixed 4, the outer fixing ring 9 is crimped and crimped to clamp the shield layer folded portion 4A and the shield layer gripping portion 6A between the inner and outer fixing rings 8 and 9, and the shield layer folded portion 4A is made of rubber. The rubber plug 6 is fixed to the outer sheath 5 of the shielded electric wire 1 while being held by the shield layer holding portion 6 </ b> A of the plug 6. Reference numeral 10 denotes a terminal connected to the core wire 2 of the shielded electric wire 1 by crimping (see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-340304 (paragraphs 0009 to 0012 in FIG. 1 in the Detailed Description of the Invention, FIG. 1)
[0004]
[Problems to be solved by the invention]
In the shielded wire end treatment structure, when the rubber plug 6 is fitted on the outer sheath 5 of the shielded electric wire 1, the rubber plug is based on the position of the stepped end portion 5 </ b> A of the outer sheath 5 of the shielded electric wire 1. It is desirable to position 6 and fit the shield layer gripping portion 6A of the rubber plug 6 at the designed predetermined position.
[0005]
However, in the conventional shielded wire terminal processing structure, the inner fixing ring 8 of the fixing member 7 is directly fitted on the outer sheath 5 of the shielded electric wire 1, and the shield layer 4 on the inner side of the outer sheath 5 is formed thereon. Since the shield layer folded portion 4A that is folded outward is covered, the stepped end portion 5A of the jacket 5 is covered with the shield layer folded portion 4A, and the position of the stepped end portion 5A cannot be visually observed from the outside.
[0006]
For this reason, it is not easy to position the shield layer gripping portion 6A of the rubber plug 6 that covers the shield layer folded portion 4A with reference to the position of the stepped end portion 5A of the outer sheath 5 of the shielded electric wire 1. The rubber plug 6 cannot be accurately fitted at a predetermined position on the outer cover 5, and the position of the rubber plug 6 is easily displaced.
[0007]
When the rubber plug 6 is fitted and fixed to the outer cover 5 in a state where the position of the rubber plug 6 is deviated from a predetermined position, when the terminal processing structure of the shielded electric wire 1 is connected to the mating connector, the seal portion 6B of the rubber plug 6 is It will not be fitted or closely attached to the rubber plug insertion port (not shown) of the mating connector. Further, since the metal internal fixing ring 8 having poor elasticity is directly fitted on the outer sheath 5 of the shielded electric wire 1 and a gap is easily formed between the outer sheath 5 and the rubber plug 6 and the outer sheath 5. Adhesion also decreases. As a result, the conventional terminal processing structure of the shielded electric wire 1 has a problem that the waterproof performance is lowered.
[0008]
Furthermore, in the conventional terminal processing structure, the shield layer folding portion 4A of the shield layer 4 is sandwiched between the metal inner and outer fixing rings 8 and 9 via the shield layer gripping portion 6A of the rubber plug 6, so that the shielded wire The rubber plug 6 must be made of conductive rubber so as to have conductivity so that one shield layer 4 can be dropped to the ground through the connector connecting portion. For this reason, there is a problem that the cost of manufacturing the rubber plug 6 is increased, and the cost of the terminal processing structure is increased.
[0009]
The present invention has been made in view of the above, and an object of the present invention is to provide a shielded wire terminal processing structure that is excellent in waterproof performance and inexpensive.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the shield wire end treatment structure of the present invention comprises a shield layer gripping portion and a seal portion, and is fitted with a rubber plug fitted on the sheath of the shield wire end, and the shield wire end The shield layer folded portion of the shield layer exposed by stepping off is gripped by the shield layer gripping portion of the rubber plug, and a metal fixing member for fixing the rubber plug to the outer sheath of the shielded electric wire is provided. In the terminal processing structure of shielded wire,
The fixing member is composed of an internal fixing ring that is fitted onto the shield layer gripping part of the rubber plug, and an external fixing ring that is fitted via a shield layer folded portion that is put on the fixing ring.
By pressing the outer fixing ring, the shield layer folded portion is sandwiched between the inner and outer fixed rings, and the shield layer folded portion is held above the shield layer holding portion of the rubber plug. .
[0011]
According to such a terminal treatment structure, after the rubber plug is fitted on the outer sheath of the shielded electric wire, the shield layer folded back in which the exposed free end of the shield layer is folded outward beyond the stepped end portion of the outer sheath. When the rubber plug is fitted on the outer cover, the stepped end of the outer cover of the shielded electric wire will still be put on the inner fixing ring fitted on the shield layer gripping part of the rubber plug However, it is not covered with the folded part of the shield layer, and the position of the stepped edge can be easily visually observed from the outside.
[0012]
Accordingly, it becomes easy to position the shield layer gripping portion of the rubber plug on the basis of the position of the stepped end portion of the outer cover of the shielded wire, and the rubber plug is accurately fitted at a predetermined position on the jacket. This can prevent the displacement of the rubber stopper.
[0013]
Therefore, when connecting the terminal treatment structure of the shielded wire to the mating connector, the rubber plug seal part fits and adheres to the mating connector's rubber plug insertion slot, and there is no gap between the rubber plug and the jacket. The adhesion between the rubber plug and the outer cover is increased by the elastic force of the rubber plug, and the waterproof performance of the terminal treatment structure of the shielded wire can be improved.
[0014]
In addition, since the shield layer folded portion of the shield layer is directly sandwiched between the metal inner and outer fixing rings, the shield layer of the shielded wire is grounded through the connector connection portion without the rubber plug having conductivity. Since it can be dropped, the cost of manufacturing the rubber plug is reduced, and an inexpensive terminal processing structure can be obtained.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings. 1A and 1B show an embodiment of a terminal processing structure of a shielded wire 11 according to the present invention. FIG. 1A is a longitudinal sectional view, and FIG. 1B is a transverse sectional view taken along line XX in FIG. .
[0016]
The terminal processing structure of the shielded electric wire 11 according to the present embodiment includes a small-diameter shield layer gripping portion 16A and a large-diameter seal portion 16B, and has an insulating property having elasticity to be fitted on the outer sheath 15 of the terminal of the shielded electric wire 1. The rubber plug 16 formed by molding rubber (cylindrical in the illustrated example), the core 12 exposed by stripping the end of the shielded wire 11, the rubber, and the plastic insulating material are extruded and coated. In the shield layer 14 formed by braiding the formed insulation coating layer 13 and a large number of braided wires made of, for example, fine copper wire, the shield layer folded portion 14A formed by folding the free end side of the shield layer 14 outward. Is held by the shield layer holding portion 16A of the rubber plug 16, and a metal fixing member 17 for fixing the rubber plug 16 to the outer jacket 15 of the shielded electric wire 11 is provided.
[0017]
More specifically, an annular corrugated protrusion 16B1 is formed on the inner and outer peripheral surfaces of the seal portion 16B of the rubber plug 16 along the longitudinal direction. It is preferable that the annular corrugated protrusion 16B1 is formed because the contact pressure between the outer cover 15 of the shielded electric wire 11 and the rubber plug insertion port (not shown) of the mating connector can be increased to further improve the sealing performance. .
[0018]
The fixing member 17 includes a metal internal fixing ring 18 having conductivity such as a copper material fitted on the shield layer gripping portion 16A of the rubber plug 16, and a shield of the shield layer 14 covered thereon. It consists of a metal external fixing ring 19 having conductivity such as a copper material fitted through the layer folding portion 14A. Then, the outer fixing ring 19 is crimped and crimped to hold the shield layer folded portion 14A between the inner and outer fixing rings 18 and 19, and the shield layer folded portion 14A is attached to the shield layer gripping portion 16A of the rubber plug 16. The rubber plug 16 is held and fixed to the outer sheath 15 of the shielded electric wire 11. Reference numeral 20 denotes a terminal connected to the core wire 12 of the shielded electric wire 11 by crimping. The terminal processing structure of the shielded electric wire 11 of the present embodiment is configured as described above.
[0019]
According to the terminal processing structure of the present invention, after the rubber plug 16 is fitted on the outer sheath 15 of the shielded electric wire 11, the exposed free end of the shield layer 14 extends beyond the stepped end portion 15 </ b> A of the outer sheath 15. When the shield layer folded portion 14A is folded over the inner fixing ring 18 fitted on the shield layer gripping portion 16A of the rubber plug 16, the rubber plug 16 is fitted to the outer cover 15. The stepped end portion 15A of the outer sheath 15 of the shielded electric wire 11 is not yet covered with the shield layer folded portion 14A, and the position of the stepped end portion 15A can be easily seen from the outside.
[0020]
Therefore, it becomes easy to position the shield layer gripping portion 16A of the rubber plug 16 on the basis of the position of the stepped end portion 15A of the jacket 15 of the shielded electric wire 11, and the rubber plug 16 is placed on the jacket 15 in a predetermined manner. The rubber plug 16 can be accurately fitted to the position, and displacement of the rubber plug 16 can be prevented.
[0021]
Therefore, when connecting the terminal processing structure of the shielded wire 11 to the mating connector, the seal portion 16B of the rubber plug 16 is fitted and closely attached to the rubber plug insertion port (not shown) of the mating connector. There is no gap between the cover 15 and the elastic force of the rubber plug 16 increases the adhesion between the rubber plug 16 and the jacket 15 and improves the waterproof performance of the terminal treatment structure of the shielded wire 11.
[0022]
Furthermore, since the shield layer folded portion 14A of the shield layer 14 is directly sandwiched between the metal inner and outer fixing rings 18 and 19, the shield layer of the shielded electric wire 11 can be provided without making the rubber plug 16 conductive. 14 can be grounded through the connector connecting portion, so that the cost of manufacturing the rubber plug 16 can be reduced, and an inexpensive terminal processing structure can be obtained.
[0023]
Next, the terminal processing method for obtaining the terminal processing structure of the shielded electric wire according to the present invention will be described with reference to FIGS. First, as shown in FIG. 2A, the rubber plug 16 in a state where the internal fixing ring 18 of the fixing member 17 is previously fitted on the shield layer gripping portion 16A of the rubber plug 16 is connected to the shield layer gripping portion 16A. Is inserted from the free end side onto the outer sheath 15 of the terminal of the shielded electric wire 11 so as to face back so as not to interfere with the stepping process of the terminal of the shielded electric wire 11.
[0024]
Next, as shown in FIG. 2B, predetermined portions of the ends of the shielded wires 11 are stepped off sequentially from the outer sheath 15 side, and the core wire 12, the insulating coating layer 13, and the shield layer 14 are exposed for each predetermined length. Let the stripping process.
[0025]
Next, as shown in FIG. 2 (c), the rubber plug 16 in which the internal fixing ring 18 of the fixing member 17 is fitted on the shield layer gripping portion 16 </ b> A is moved from the back side position of the shielded cable 11 to the shielded cable. 11, the shield layer gripping portion 16A of the rubber plug 16 is positioned with reference to the position of the step peeling end portion 15A. In the illustrated example, positioning is performed such that the tip of the shield layer gripping portion 16A is aligned with the edge of the stepped end portion 15A of the outer jacket 15. In this way, the rubber plug 16 is fitted into a predetermined position on the outer jacket 15.
[0026]
Next, as shown in FIG. 2D, a shield layer formed by folding the exposed free end of the shield layer 14 of the shielded electric wire 11 180 degrees beyond the stepped end 15A of the outer jacket 15 outward. The folded portion 14A is put on the internal fixing ring 18 fitted on the shield layer gripping portion 16A of the rubber plug 16. Further, the outer fixing ring 19 of the fixing member 17 is fitted on the shield layer folded portion 14A.
[0027]
Next, the outer fixing ring 19 in the state shown in FIG. 2D is crimped by crimping from four directions at intervals of 90 degrees in the circumferential direction as shown in FIG. 14A is sandwiched between the inner and outer fixing rings 18 and 19, and the shield layer folded portion 14A is held by the shield layer holding portion 16A of the rubber plug 16, and the rubber plug 16 is fixed to the outer jacket 15 of the shielded electric wire 11 and shielded. A terminal 20 (see FIG. 1A) is connected to the core wire 12 of the electric wire 11 by crimping. In this way, a terminal processing structure configured as shown in FIGS. 1A and 1B is obtained.
[0028]
In the terminal processing method, the internal fixing ring 18 of the fixing member 17 is previously fitted on the shield layer gripping portion 16A of the rubber plug 16, but the rubber plug 16 is inserted into the terminal of the shielded electric wire 11. After or after the end of the shielded wire 11 is stepped off as shown in FIG. 2 (b), or as shown in FIG. After moving to the vicinity of the portion 15A and fitting at a predetermined position on the jacket 15, it may be inserted into the end of the shielded electric wire 11 and fitted onto the shield layer gripping portion 16A of the rubber plug 16. . Further, the connection of the terminal 20 is performed during any terminal processing step from the step of stripping the terminal of the shielded electric wire 11 to the time when the external fixing ring 19 of the fixing member 17 is fitted to the rubber plug 16 side and crimped. You may go on.
[0029]
【The invention's effect】
As described above, according to the shield wire end treatment structure of the present invention, the shield layer folded portion of the shield layer exposed by stepping off the shield wire end is gripped by the shield layer gripping portion of the rubber plug, and the rubber A metal fixing member that fixes the plug to the outer sheath of the shielded electric wire is fitted via an internal fixing ring that is fitted on the shield layer gripping part of the rubber plug, and a shield layer folded portion that is placed on the inner fixing ring. Since the shield layer folded portion is sandwiched between the inner and outer fixing rings by crimping the outer fixing ring, when the rubber plug is fitted to the jacket, The stepped end portion of the outer sheath of the shielded electric wire is not covered with the shield layer folded portion, and the position of the stepped end portion 5A can be easily seen from the outside.
[0030]
Accordingly, it becomes easy to position the shield layer gripping portion of the rubber plug on the basis of the position of the stepped end portion of the outer cover of the shielded wire, and the rubber plug is accurately fitted at a predetermined position on the jacket. This can prevent the displacement of the rubber stopper.
[0031]
Therefore, when connecting the terminal treatment structure of the shielded wire to the mating connector, the rubber plug seal part fits and adheres to the mating connector's rubber plug insertion slot, and there is no gap between the rubber plug and the jacket. The adhesion between the rubber plug and the outer cover is increased by the elastic force of the rubber plug, and the waterproof performance of the terminal treatment structure of the shielded wire can be improved.
[0032]
In addition, since the shield layer folded portion of the shield layer is directly sandwiched between the metal inner and outer fixing rings, the shield layer of the shielded wire is grounded through the connector connection portion without the rubber plug having conductivity. Since it can be dropped, the cost of manufacturing the rubber plug is reduced, and an inexpensive terminal processing structure can be obtained.
[Brief description of the drawings]
1A and 1B show an embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view, and FIG. 1B is a transverse sectional view taken along line XX in FIG.
FIG. 2 is a longitudinal sectional view showing a terminal processing method for obtaining a terminal processing structure for a shielded electric wire according to the present invention in the order of steps, wherein (a) shows a state in which a rubber plug is inserted in the terminal of the shielded electric wire in advance; ) Shows a state in which the end of the shielded wire has been stripped, and (c) shows a state in which a rubber plug is fitted in the vicinity of the stripped end portion of the sheath of the shielded wire.
FIG. 3 is a partial cross-sectional front view showing a conventional shielded wire terminal processing structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Shield electric wire 12 Core wire 13 Insulation coating layer 14 Shield layer 14A Shield layer folding | returning part 15 Outer sheath 15A Stepped end part 16 Rubber stopper 16A Shield layer holding part 16B Seal part 16B1 Annular corrugated protrusion 17 Fixing member 18 Internal fixing ring 19 External Fixing ring 20 terminal

Claims (1)

A rubber plug comprising a shield layer gripping part and a seal part, and fitted on the outer sheath of the shielded wire end, and the shield layer folded portion of the shield layer exposed by stripping the end of the shielded wire. In the terminal processing structure of the shielded electric wire, comprising a metal fixing member that holds the rubber plug to the outer sheath of the shielded electric wire,
The fixing member is composed of an internal fixing ring that is fitted onto the shield layer gripping part of the rubber plug, and an external fixing ring that is fitted via a shield layer folded portion that is put on the fixing ring.
By crimping the outer fixing ring, the shield layer folded portion is sandwiched between inner and outer fixing rings, and the shield layer folded portion is gripped above the shield layer gripping portion of the rubber plug. Terminal processing structure for shielded wire.

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