JP4951668B2 - Grounding structure of shielded wire - Google Patents

Description

  The present invention relates to a grounding structure for a shielded wire that grounds a braided wire at the end of the shielded wire.

  As an example of a conventional grounding structure of a shielded wire, at least one side of a shield terminal is placed on an insulating sheath, and ultrasonic vibration is performed in a state where a resin chip is overlaid on one side of the shield terminal. There is known a grounding structure for a shielded wire in which an insulating sheath is melted and scattered to form a shield conducting portion where one side of a shield terminal and a braided wire are in conductive contact (for example, see Patent Document 1).

  In addition, as another example of the conventional grounding structure of the shielded electric wire, the shield layer of the end of the shielded electric wire is folded back to the outer periphery of the insulating sheath, the shield layer folded back by the barrel of the metal shell is crimped, and the claw portion of the barrel There is known a grounding structure for a shielded electric wire that penetrates through a shield layer that is folded back, and is squeezed into an insulating sheath to crimp the insulating sheath (see, for example, Patent Document 2).

JP-A-11-135167 Japanese Patent Laid-Open No. 10-270123

  However, in Patent Document 1, the end portion of the lead wire is placed on an insulating outer shell, and a resin chip is stacked on the end, sandwiched between a pair of ultrasonic horns, and subjected to ultrasonic vibration while being pressurized from the upper side of the resin chip. Therefore, there is a possibility that a large load is applied to the braided wire and the core wire portion to damage them.

  Moreover, in the said patent document 2, in order for the nail | claw of a barrel to bite into a shield layer, there exists a possibility that a shield layer may fracture | rupture.

Normally, the braided wire in such shielded wires is braided in a net shape to cover the entire circumference of the signal line in the length direction, so that the ground circuit can be ensured so that noise caused by disturbance does not reach the signal line. It is desired to form.
However, as shown in FIG. 7, in the conventional shielded wire grounding structure, the sheath 51 of the shielded wire 50 is peeled off, the core wire 53 is pulled out from the braided wire 52, the end of the core wire 53 is peeled off, and the terminal 54 is crimped. Connecting. The braided wire 52 separated from the core wire 53 is twisted and then wound with a tape or covered with a shrink tube, and the tip is cut and trimmed to be crimped and connected to the terminal 55. Therefore, the working efficiency is low, and the braided wire 52 of the drawn portion is twisted in a linear shape, so that the capacity for shielding the disturbance is reduced, and the shielding effect on the drawn core wire 53 may be reduced. is there. On the other hand, in the core wire 53 drawn out from the braided wire 52 and separated, there is a non-shielded area that is not covered by the braided wire 52 as far as the terminals 54 are routed. Further, the braided wire 52 requires a large number of man-hours for additional work such as trimming to align the tips.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a grounding structure for a shielded electric wire capable of improving workability in processing and improving noise shielding performance. .

1) A grounding structure for a shielded electric wire according to the present invention includes a core wire portion made of a conductor, a core wire covering portion covering the core wire portion, a braided wire provided around the core wire covering portion, and a periphery of the braided wire A grounding structure for a shielded electric wire comprising: a core wire portion; a core wire covering portion; and a resin insulating sheath covering the braided wire, wherein the braided wire is drawn out in an outer peripheral direction of the core wire covering portion. forming a flange portion Te, a pair of side plates with a sleeve disposed to face each other with a press-contact blade is formed in a U-shaped cross-section having a conductivity across the shield wire, the collar-like portion to said pressure contact blades In addition, the accessory wire is press-fitted and the accessory wire is connected to the hook-shaped portion to perform grounding.

  According to the grounding structure of the shielded electric wire described in 1) above, the sleeve has the braided wire and the braided wire for electrically connecting the attached wire to the hook-shaped portion of the braided wire drawn out in the outer peripheral direction of the core wire covering portion. Since a large load is not applied to the core wire portion, the quality can be maintained without damaging or breaking them. Further, since the hook-shaped portion of the braided wire is formed in a hook shape, the shield capacity is not reduced, so that a reliable ground circuit can be formed. Furthermore, since the braided wire is electrically connected to the attached wire without additional work such as trimming, work efficiency can be improved. Accordingly, it is possible to improve workability in processing and improve noise shielding performance.

  According to the grounding structure of the shielded wire of the present invention, since a large load is not applied to the braided wire and the core wire part, the workability in the grounding is improved and the noise shielding performance is improved to provide a high-quality shielded wire. The effect that it can be obtained is acquired.

It is sectional drawing of the shielded electric wire produced by the reference example of the earth processing structure of the shielded electric wire which concerns on this invention. It is sectional drawing of the shield electric wire shown in FIG. It is sectional drawing of the modification of the earth processing structure of the shield wire shown in FIG. It is sectional drawing of the shielded electric wire of another form. It is an external appearance perspective view of the sleeve used for the embodiment of the earthing | grounding structure of the shielded wire which concerns on this invention. FIG. 6 is a side view of a shielded electric wire assembled with the sleeve shown in FIG. 5. It is an external view of the conventional shielded electric wire.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below in detail with reference examples with reference to the drawings.

(Reference example)
FIG. 1 is a cross-sectional view of a shielded electric wire produced by a reference example of a grounding structure for a shielded electric wire according to the present invention, FIG. 2 is a cross-sectional view of the shielded electric wire shown in FIG. 1, and FIG. Sectional drawing of the modification of a structure, FIG. 4 is sectional drawing of the shielded electric wire of another form.

  As shown in FIG. 1, a shielded electric wire 10 having a grounding structure for a shielded electric wire which is a reference example of the present invention includes a core wire portion 11 made of a conductor, a core wire covering portion 12 covering the core wire portion 11, and a core wire covering portion 12. It consists of a braided wire 14 provided around, and a core insulating part (sheath) 15 provided around the braided wire 14 and covering the core wire part 11, the core wire covering part 12, and the braided wire 14.

  The first feature of the shielded electric wire 10 is that the braided wire 14 is drawn out in the outer peripheral direction of the insulating sheath 15 to form the hook-shaped portion 16. Since the hook-like portion 16 is formed in a hook shape and is arranged in a cylindrical shape on the outer periphery of the insulating skin 15, the entire surface area is not reduced, so that a large grounding capacity is maintained and a reliable ground circuit is provided. Contribute to the formation of

  The second feature of the shielded electric wire 10 is that the first sleeve 17 and the second sleeve 18 are assembled to the hook-shaped portion 16 of the braided wire 14 so that they can be electrically connected.

  The first sleeve 17 is formed in an annular shape with a conductive material having an inner diameter slightly larger than the outer diameter of the insulating outer skin 15 and a predetermined outer diameter. In the manufacturing process, the first sleeve 17 is assembled to the insulating outer shell 15 before the braided portion 16 of the braided wire 14 is pulled out, and the hooked portion 16 drawn out to the outer peripheral portion is disposed. Since the first sleeve 17 has a length substantially the same as the length of the pulled-out hook-shaped portion 16, the first sleeve 17 is electrically connected to the inner periphery of the hook-shaped portion 16 with a large area.

  The second sleeve 18 is formed in an annular shape having a larger inner diameter than the first sleeve 17 and a predetermined outer diameter by a conductive material. In the manufacturing process, the second sleeve 18 is attached to the outer peripheral portion of the hook-like portion 16 in which the first sleeve 17 is inserted together with the core wire 20 of the attached wire 19 connected to the ground circuit. Since the second sleeve 18 has a length substantially the same as the length of the drawn hook-shaped portion 16, the second sleeve 18 is electrically connected to the outer periphery of the hook-shaped portion 16 with a large area.

  As shown in FIG. 2, the shielded electric wire 10 is formed by drawing the outer diameter into a circular shape by swaging when the first sleeve 17 and the second sleeve 18 are assembled. As a result, the flange-shaped portion 16 of the braided wire 14 is electrically connected to the first sleeve 17 on the inner peripheral side with a large contact area, and the outer peripheral side is in great contact with the second sleeve 18 together with the core wire 20 of the attached wire 19. Electrically connected by area. At this time, since the first sleeve 17 and the second sleeve 18 that have been subjected to the swaging process do not apply a large load to the insulating sheath 15, the braided wire 14, and the core wire covering portion 12, the braided wire 14 and the core wire portion 11 may be damaged. It will not break.

  Such a shielded electric wire 10 is manufactured by the following processes.

  First, the insulating outer skin 15 is cut at a predetermined position, and the braided wire 14 is drawn out in the outer peripheral direction of the insulating outer skin 15 to form the hook-shaped portion 16. A terminal 21 is crimped and connected to the core wire portion 11 from which the insulating sheath 15 has been removed.

  Next, the first sleeve 17 is assembled to the inner peripheral portion of the hook-shaped portion 16 of the braided wire 14, and the second sleeve 18 is assembled to the outer peripheral portion of the hook-shaped portion 16, and swaging is performed together with the core wire 20 of the attached wire 19. Is done. As a result, the first and second sleeves 17 and 18 are electrically connected to the flange-shaped portion 16 having a large area with a large contact area, and the second sleeve is electrically connected to the flange-shaped portion 16 with a large contact area. The core wire 20 of the attached wire 19 is electrically connected to 18. At this time, the core part 11 has a small non-shielding range and is electrically connected to the terminal 21.

  Next, a modified example of the shielded electric wire 10 will be described with reference to FIG. In this modification, hexagonal caulking is used. In this case, when the first sleeve 17 and the second sleeve 18 are assembled, the shielded electric wire 10 is caulked and formed with a hexagonal outer diameter by hexagonal caulking. As a result, the flange-shaped portion 16 of the braided wire 14 is electrically connected to the first sleeve 17 on the inner peripheral side with a large contact area, and the outer peripheral side is in great contact with the second sleeve 18 together with the core wire 20 of the attached wire 19. Electrically connected by area. At this time, the first sleeve 17 and the second sleeve 18 that have been subjected to hexagonal caulking process do not apply a large load to the insulating sheath 15, the braided wire 14, the core wire covering portion 12, and the core wire portion 11, so the braided wire 14 and the core wire portion 11 is not damaged or broken. Further, since the outer periphery of the second sleeve 18 is formed into a hexagonal outer periphery, the second sleeve 18 can exhibit a function of preventing rotation when being inserted into a connector (not shown).

  As described above, according to the grounding structure of the shielded electric wire of this reference example, the first sleeve 17 is large on the inner peripheral side of the hook-shaped portion 16 of the braided wire 14 drawn out in the outer peripheral direction of the insulating sheath 15. The second sleeve 18 is electrically connected in a large area and is electrically connected in a large area to the outer peripheral side of the bowl-shaped portion 16, so that the sealing capacity is not reduced, and the attached line 19 is not reduced. A reliable ground circuit can be formed. Moreover, since a large load is not applied to the braided wire 14 and the core wire portion 11, the quality can be maintained without damaging or breaking them. Furthermore, since the braided wire 14 is electrically connected to the core wire 20 of the attached wire 19 without additional work such as trimming, work efficiency can be improved. In addition, since the core wire part 11 has a small non-shielding range, the shield effect can be obtained in a wide range with respect to the core wire part 11. As a result, it is possible to improve workability in processing and improve noise shielding performance. In addition, since a uniform outer diameter can be obtained by swaging or hexagonal caulking, it is possible to improve the shielding property against disturbance and make it less susceptible to noise.

  Note that the grounding structure of the shielded electric wire according to the present reference example can be applied to a shielded electric wire having a single-core wire portion in addition to the shielded electric wire having the pair of core wire portions described above. That is, a shielded electric wire 10A as shown in FIG. 4 includes a core wire portion 11 made of a single wire conductor, an insulating endothelium 13 covering the core wire portion 11, a braided wire 14 provided around the insulating endothelium 13, and a braided wire 14 And an insulating outer shell 15 provided on the outer periphery of the outer shell. Since the grounding structure is the same as the above-described reference example, the description is omitted.

(Embodiment)
Next, an embodiment of the grounding structure for shielded wires according to the present invention will be described with reference to FIGS. In addition, about the component etc. which overlap with the shield electric wire 10 already demonstrated, description is simplified or abbreviate | omitted by attaching | subjecting the same code | symbol or an equivalent code | symbol in a figure.

  FIG. 5 is an external perspective view of a sleeve used in the embodiment of the grounding structure of the shielded wire according to the present invention, and FIG. 6 is a side view of the shielded wire assembled with the sleeve shown in FIG.

  As shown in FIG. 5, the sleeve 30 used for the grounding structure of the shielded wire according to the embodiment of the present invention is formed in a U-shape by a conductive material, and a pair of side plates 31 arranged to face each other. , 31 have press contact blades 32, 32 at the upper end.

  As shown in FIG. 6, in the shielded electric wire 40 created using the sleeve 30, the sleeve 30 is arranged in accordance with the flange portion 16 of the braided wire 14 drawn out in the outer peripheral direction of the core wire covering portion 12. Then, the hook-shaped portion 16 and the core wire 20 of the attached wire 19 are press-fitted into the press contact blades 32, 32 of the sleeve 30. Since the press contact blades 32 and 32 usually have a gap smaller than the total width of the flanged portion 16 and the core wire 20, when the flanged portion 16 and the core wire 20 of the attached wire 19 are press-fitted, The two are pressed and electrically connected.

  According to the shielded wire grounding structure of the present embodiment, the sleeve 30 is for electrically connecting the core wire 20 of the attached wire 19 to the flange portion 16 of the braided wire 14 drawn out in the outer peripheral direction of the insulating sheath 15. Moreover, since a large load is not applied to the braided wire 14 and the core wire portion 11, the quality can be maintained without damaging or breaking them. Further, since the hook-like portion 16 of the braided wire 14 drawn out in the outer peripheral direction of the insulating outer skin 15 is formed in a hook-like shape, the shield capacity does not become small, so that a reliable ground circuit can be formed. . Furthermore, since the braided wire 14 is electrically connected to the core wire 20 of the attached wire 19 without additional work such as trimming, work efficiency can be improved. Accordingly, it is possible to improve workability in processing and improve noise shielding performance.

  The present invention is not limited to the reference examples and embodiments described above, and modifications, improvements, and the like can be made as appropriate. For example, the shape of the first and second sleeves in the reference example may be a polygonal shape instead of the illustrated annular shape.

  Further, in the sleeve in the embodiment, the connection terminal may be formed integrally, so that the ground circuit can be formed in another circuit through the connection terminal.

10, 40 Shielded wire 11 Core wire portion 12 Core wire covering portion 13 Insulating endothelium
14 Braided wire 15 Insulating outer skin 16 Saddle-shaped part 17 First sleeve (sleeve)
18 Second sleeve (sleeve)
19 Attached wire 20 Core wire 30 Sleeve

Claims (1)

A core portion made of a conductor;
A core wire covering portion covering the core wire portion;
A braided wire provided around the core wire covering portion;
A grounding structure for a shielded electric wire comprising a core wire portion, the core wire covering portion, and a resin insulation sheath covering the braided wire provided around the braided wire,
The braided wire is drawn out in the outer circumferential direction of the core wire covering portion to form a hook-like portion, and is formed in a U-shaped cross section having conductivity, and a pair of side plates are arranged opposite to each other with a pressure contact blade across the shielded electric wire. A grounding structure for a shielded wire, wherein a grounding treatment is performed by press-fitting the hook-like portion and the attached wire into the press contact blade and connecting the attached wire to the hook-like portion.

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