JP2021086677A - Connection structure of shield wire - Google Patents

Abstract

To provide a connection structure of a shield wire that can prevent relative misalignment between a braid of the shield wire and a braid clamping piece of a shield shell even when a pulling force is applied on the shield wire in a direction away from the shield shell.SOLUTION: A connection structure of a shield wire comprises: an inner housing 18 to which a terminal 15 connected to an end 10a of a shield wire 10 is attached; a shield shell 17 having a housing accommodation part 17a accommodating the inner housing 18 and a braid clamping piece 17b clamping and connecting a braid 13 exposed at a cut section of the sheath 14 of the shield wire 10; and a cylindrical sleeve 16 having an outer circumferential surface 16a provided with a locking projection part 16b and installed to an outer circumference of the braid 13. The braid 13 has a folded-back part folded back so as to cover the locking projection part 16b of the cylindrical sleeve 16, and the locking projection part 16b of the cylindrical sleeve 16 is arranged at a position that is in contact with an end 17c of the braid clamping piece 17b of the shield shell 17.SELECTED DRAWING: Figure 2

Description

The present invention relates to a connection structure of a shielded electric wire.

As a shield connector to which this kind of shielded electric wire connection structure is applied, there is one described in Patent Document 1. The shield connector described in Patent Document 1 includes a dielectric accommodating an inner conductor terminal connected to a signal conductor of a terminal of a shielded electric wire, an outer conductor terminal accommodating the dielectric, and an insulator and a shield of the shielded electric wire. It is provided with a cylindrical sleeve that is inserted between conductors (braids). Further, the outer conductor terminal has a sheath crimping portion for crimping the sheath of the shielded electric wire and a shield conductor crimping portion for crimping the shield conductor exposed from the sheath.

Japanese Unexamined Patent Publication No. 2006-310135

However, in the shielded wire connection structure applied to the shielded connector described in Patent Document 1, when a tensile force is applied to the shielded wire in a direction away from the outer conductor terminal, the outer conductor terminal and the shielded wire are relative to each other. There is a risk of misalignment.

The present invention has been made in view of the problems of the prior art. An object of the present invention is the connection of a shielded electric wire that prevents the relative displacement between the braided shielded electric wire and the braided crimping piece of the shielded wire even when a tensile force is applied to the shielded electric wire in a direction away from the shield shell. To provide the structure.

In the shielded electric wire connection structure according to the aspect of the present invention, the inner housing to which the terminal connected to the terminal of the shielded electric wire is mounted, the housing accommodating portion accommodating the inner housing, and a part of the sheath of the shielded electric wire are cut off. It is provided with a shield shell having a braided crimping piece for crimping and connecting the exposed braid, and a tubular sleeve provided with a locking convex portion on the outer peripheral surface and attached to the outer periphery of the braid. The braid has a folded portion that is folded back to cover the locking convex portion of the tubular sleeve, and the locking convex portion of the tubular sleeve is of the braided crimping piece of the shield shell. It is a connection structure of a shielded electric wire arranged at a position where it comes into contact with an end portion.

It is preferable that the sleeve is formed in a cylindrical shape, and the locking convex portion has a taper that is inclined so as to be lowered toward the end portion side of the braided crimping piece.

It is preferable that the sleeve is formed in a cylindrical shape, and the locking convex portion has a protruding piece that presses the end portion of the braided crimping piece from above.

The shield shell preferably has a sheath crimping piece for crimping and connecting the sheath of the shielded electric wire.

It is preferable that the terminal is crimp-connected to a core wire exposed at each terminal of a plurality of internal electric wires of the shielded electric wire.

It is preferable that a metal impedance adjusting member having an insertion hole through which the terminal is inserted is interposed between the inner housing and the tubular sleeve.

According to the present invention, even if a tensile force is applied to the shielded wire in a direction away from the shield shell, the relative displacement between the braided shielded wire and the braided crimping piece of the shielded wire is prevented. Can be provided.

It is a perspective view which shows an example which applied the connection structure of the shield electric wire which concerns on 1st Embodiment of this invention to the inner module of a shield connector. It is an exploded perspective view of the said inner module. It is a perspective view of the cylindrical sleeve used for the said inner module. (A) is a perspective view of a terminal portion of the shielded electric wire of the inner module, and (b) is a perspective view showing a state in which the braid is folded back at the terminal portion of the shielded electric wire. It is a side view of the said inner module. It is sectional drawing of the main part of the said inner module. It is an exploded perspective view which shows an example which applied the connection structure of the shield electric wire which concerns on 2nd Embodiment of this invention to the inner module of a shield connector. It is a perspective view of the cylindrical sleeve used for the inner module of the 2nd Embodiment. (A) is a perspective view of a terminal portion of the shielded electric wire of the inner module of the second embodiment, and (b) is a perspective view showing a state in which the braid is folded back at the terminal portion of the shielded electric wire. It is a side view of the inner module of the 2nd Embodiment. It is sectional drawing of the main part of the inner module of the 2nd Embodiment.

Hereinafter, the connection structure of the shielded electric wire according to the embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example in which the connection structure of the shielded electric wire according to the first embodiment of the present invention is applied to the inner module of the shielded connector. FIG. 2 is an exploded perspective view of the inner module. FIG. 3 is a perspective view of a cylindrical sleeve used for the inner module. FIG. 4A is a perspective view of the terminal portion of the shielded electric wire of the inner module. FIG. 4B is a perspective view showing a state in which the braid is folded back at the terminal portion of the shielded electric wire. FIG. 5 is a side view of the inner module. FIG. 6 is a cross-sectional view of a main part of the inner module.

As shown in FIGS. 1 and 2, the shield connector 1 is for high-speed transmission, and accommodates an inner module 2 connected to the terminal of an STP (Shielded Twisted Pair) electric wire, which is a shielded electric wire 10, and the inner module 2. The outer housing 3 is provided.

The outer housing 3 is formed of a resin in a box shape, and has a module housing portion 3a in which the inner module 2 is housed. Further, on the upper surface 3b side of the outer housing 3, a lock arm 3c for maintaining a fitted state when mated with a mating connector (not shown) is provided.

Further, as shown in FIG. 2, the shielded wire connection structure 5 applied to the inner module 2 includes a shielded wire 10, a female terminal (terminal) 15, a sleeve 16, a shield shell 17, and an inner housing 18. , And an impedance adjusting member 19.

As shown in FIGS. 2, 4 (a), 4 (b), and 6, the shielded electric wire 10 includes two twisted internal electric wires 11 and 11 and two internal electric wires via a shield foil 12. A braid 13 that covers 11 and 11 and a resin sheath 14 that covers the braid 13 are provided. Each internal electric wire 11 has a core wire 11a and a resin insulating coating 11b that covers the core wire 11a. The two internal electric wires 11 and 11 exposed on the terminal 10a side of the shielded electric wire 10 are untwisted, and the crimping portion 15b of the female terminal 15 is crimped to the core wire 11a exposed from each of the insulating coatings 11b. It is made to be crimped and connected by processing.

As shown in FIGS. 3 and 4 (a) and 4 (b), the sleeve 16 is formed in a metal cylindrical shape, and a part of the sheath 14 of the shielded electric wire 10 is cut off to expose the braid 13. It is designed to be attached to the outer circumference. A locking convex portion 16b is provided so as to project from the front end side of the outer peripheral surface 16a of the cylindrical sleeve 16. As shown in FIG. 6, the locking convex portion 16b is attached to the end portion 17c of the braided crimping piece 17b when the braided crimping piece 17b of the shield shell 17, which will be described later, is crimped to the braided 13 of the shielded electric wire 10. It is placed at the abutting position. Further, the locking convex portion 16b has a taper 16c that is inclined so as to be lowered toward the end portion 17c side of the braided crimping piece 17b. Then, as shown in FIG. 4B, the locking convex portion 16b of the cylindrical sleeve 16 is covered with the folded braid 13. That is, the braid 13 has a folded-back portion 13a that is folded back by the cylindrical sleeve 16.

As shown in FIG. 2, the shield shell 17 is formed by sheet metal processing using a sheet metal material. The shield shell 17 has a tubular housing accommodating portion 17a for accommodating the inner housing 18. Further, the shield shell 17 crimps a pair of braided crimping pieces 17b and 17b for crimping and connecting the braids 13 exposed by cutting off a part of the sheath 14 of the shielded wire 10 and the sheath 14 of the shielded wire 10. It has a pair of sheath crimping pieces 17d and 17d that are connected to each other. As shown in FIG. 6, the braided crimping piece 17b of the shield shell 17 crimps the sleeve 16 attached to the outer circumference of the braid 13 exposed from the sheath 14 of the shielded electric wire 10, and locks the cylindrical sleeve 16. The folded-back portion 13a of the braid 13 that covers the convex portion 16b is also crimped and connected.

As shown in FIG. 2, the inner housing 18 is formed of an elliptical columnar shape made of synthetic resin, and a pair of left and right terminals accommodating the contact portions 15a of the female terminals 15 connected to the terminals of the shielded electric wires 10 on both sides thereof. It has chambers 18a and 18a. Further, in the center of the rear side of the upper and lower surfaces 18b and 18c of the inner housing 18, engaging recesses 18d with which the pair of locking arm portions 19b and 19b of the impedance adjusting member 19 described later are engaged are formed, respectively.

As shown in FIG. 2, the impedance adjusting member (insertion member) 19 is interposed between the inner housing 18 and the cylindrical sleeve 16 to suppress impedance mismatch and suppress the impedance mismatch of the inner module 2 of the shield connector 1. It improves the transmission performance. The impedance adjusting member 19 is a metal tubular shape having a pair of insertion holes 19a and 19a through which the untwisted portions of the internal electric wires 11 and 11 crimp-connected to the two female terminals 15 and 15 are inserted. Is formed in. Further, the impedance adjusting member 19 is provided with locking arm portions 19b that engage with the upper and lower engaging recesses 18d and 18d of the inner housing 18 in front of the center of the upper and lower portions, respectively.

Next, the procedure for assembling the inner module 2 of the shield connector 1 described above will be described.

First, as shown in FIG. 4A, a part of the sheath 14 of the terminal 10a of the shielded electric wire 10 is cut off to expose the braid 13, and a cylindrical sleeve 16 is attached to the outer periphery of the exposed braid 13. Then, as shown in FIG. 4B, the end portion of the braid 13 is folded back so that the folded portion 13a of the braid 13 covers the locking convex portion 16b of the cylindrical sleeve 16.

Next, the crimping portion 15b of the female terminal 15 is crimp-connected to the core wire 11a exposed from each of the insulating coatings 11b of the two internal wires 11 and 11 exposed on the terminal 10a side of the shielded wire 10. After that, the two female terminals 15 and 15 are inserted into the pair of insertion holes 19a and 19a of the impedance adjusting member 19 and housed in the pair of terminal accommodating chambers 18a and 18a of the inner housing 18.

Then, the locking arm portion 19b of the impedance adjusting member 19 is engaged with the engaging recess 18d of the inner housing 18, and the inner housing 18 is accommodated in the housing accommodating portion 17a of the shield shell 17. After that, the braided crimping piece 17b of the shield shell 17 is crimped to the braided piece 13 of the shielded electric wire 10, and the sheath crimping piece 17d is crimped to the sheath 14 of the shielded electric wire 10. That is, the connection structure 5 of the shielded electric wire is completed.

According to the connection structure 5 of the shielded electric wire, as shown in FIG. 5, even if a tensile force is applied to the shielded electric wire 10 in the direction P away from the shield shell 17, the braid 13 of the shielded electric wire 10 and the shield shell 17 Relative displacement of the braided crimping piece 17b is prevented.

That is, as shown in FIG. 6, the folded-back portion 13a of the braid 13 covering the locking convex portion 16b of the cylindrical sleeve 16 is crimped by the braided crimping piece 17b of the shield shell 17, and the sleeve 16 is crimped. The locking convex portion 16b is in contact with the end portion 17c of the braided crimping piece 17b. By this crimping and contacting, even if a force that causes a relative displacement between the shield shell 17 and the shielded electric wire 10 is applied, the shield shell 17 and the shielded electric wire 10 are prevented from being relatively displaced. By preventing the shield shell 17 and the shielded electric wire 10 from being relatively displaced from each other, it is possible to secure a contact area between the braided 13 of the shielded electric wire 10 and the braided crimping piece 17b of the shield shell 17. Therefore, the reliability of the electrical connection between the braid 13 of the shielded electric wire 10 and the braided crimping piece 17b of the shield shell 17 can be improved. Further, since the deviation is prevented, the holding force of the shielded electric wire 10 of the inner module 2 is also improved.

FIG. 7 is an exploded perspective view showing an example in which the connection structure of the shielded electric wire according to the second embodiment of the present invention is applied to the inner module of the shielded connector. FIG. 8 is a perspective view of a cylindrical sleeve used for the inner module. FIG. 9A is a perspective view of the terminal portion of the shielded electric wire of the inner module. FIG. 9B is a perspective view showing a state in which the braid is folded back at the terminal portion of the shielded electric wire. FIG. 10 is a side view of the inner module. FIG. 11 is a cross-sectional view of a main part of the inner module.

In the shielded electric wire connection structure 5 of the second embodiment, as shown in FIG. 11, the locking convex portion 16b of the cylindrical sleeve 16 presses the end portion 17c of the braided crimping piece 17b of the shield shell 17 from above. It differs from that of the first embodiment in that it has a protruding piece 16d. Since the other configurations are the same as those in the first embodiment, the same components are designated by the same reference numerals and detailed description thereof will be omitted.

More specifically, as shown in FIG. 10, in a state where the braided portion 13 of the shielded electric wire 10 and its folded portion 13a are crimped by the braided crimping piece 17b of the shield shell 17, the edge and braid of the protruding piece 16d of the sleeve 16 The edges of the end 17c of the crimping piece 17b are close to each other in the axial direction X. That is, these boundaries are line L.

According to the second embodiment, when a tensile force is applied to the shielded electric wire 10 in the direction P of the arrow shown in FIG. 10, that is, when a force is applied in the direction in which the shield shell 17 and the shielded electric wire 10 are separated from each other. The shielded electric wire 10 and the shield shell 17 cause a relative deviation. This relative (primary) deviation is indicated by reference numeral S in FIGS. 10 and 11. However, as shown in FIG. 11, the protruding piece 16d of the locking convex portion 16b of the cylindrical sleeve 16 is positioned so as to be overlapped with the folded portion 13a of the braid 13 on the outside of the braided crimping piece 17b of the shield shell 17. , The locking convex portion 16b comes into contact with the end portion 17c of the braided crimping piece 17b. As a result, the shielded electric wire 10 and the shield shell 17 are prevented from being relatively displaced from each other by more than the primary deviation S, and the same actions and effects as those of the first embodiment are obtained.

Although the present embodiment has been described above, the present embodiment is not limited to these, and various modifications can be made within the scope of the gist of the present embodiment.

That is, according to each of the above-described embodiments, the sleeve is formed in a cylindrical shape, but it may be formed in a cylindrical shape such as an elliptical cylinder shape or a square cylinder shape.

5 Shielded wire connection structure 10 Shielded wire 10a Terminal 11 Internal wire 11a Core wire 13 Braided 13a Folded part 14 Sheath 15 Female terminal (terminal)
16 Cylindrical (cylindrical) sleeve 16a Peripheral surface 16b Locking convex part 16c Taper 16d Protruding piece 17 Shield shell 17a Housing housing part 17b Braided crimping piece 17c End 17d Sheath crimping piece 18 Inner housing 19 Impedance adjusting member 19a Insertion hole

Claims (6)

The inner housing to which the terminal connected to the end of the shielded wire is mounted,
A shield shell having a housing accommodating portion for accommodating the inner housing and a braided crimping piece for crimping and connecting a braid exposed by cutting a part of the sheath of the shielded electric wire.
A tubular sleeve having a locking protrusion on the outer peripheral surface and attached to the outer circumference of the braid,
With
The braid has a folded portion that is folded back to cover the locking convex portion of the tubular sleeve.
The locking convex portion of the tubular sleeve is a connection structure of a shielded electric wire arranged at a position where it abuts on an end portion of the braided crimping piece of the shield shell. The connection structure for a shielded electric wire according to claim 1, wherein the sleeve is formed in a cylindrical shape, and the locking convex portion has a taper that is inclined so as to be lowered toward the end side of the braided crimping piece. .. The connection structure for a shielded electric wire according to claim 1, wherein the sleeve is formed in a cylindrical shape, and the locking convex portion has a protruding piece that presses an end portion of the braided crimping piece from above. The connection structure for a shielded electric wire according to any one of claims 1 to 3, wherein the shield shell has a sheath crimping piece for crimping and connecting the sheath of the shielded electric wire. The connection structure for a shielded electric wire according to any one of claims 1 to 4, wherein the terminal is crimp-connected to a core wire exposed to each terminal of a plurality of internal electric wires of the shielded electric wire. The invention according to any one of claims 1 to 5, wherein a metal impedance adjusting member having an insertion hole through which the terminal is inserted is interposed between the inner housing and the tubular sleeve. Connection structure of shielded wire.

Images