WO2012023403A1

WO2012023403A1 - Terminal structure of shielded cable and terminal processing method

Info

Publication number: WO2012023403A1
Application number: PCT/JP2011/067344
Authority: WO
Inventors: 豊寺坂
Original assignee: 矢崎総業株式会社
Priority date: 2010-08-20
Filing date: 2011-07-28
Publication date: 2012-02-23
Also published as: RU2524390C1; CN103081250B; CN103081250A; BR112013003475A2; JP5826995B2; JP2012043681A

Abstract

An objective of the present invention is to prevent unintended unraveling of a shielded conductor that is wound in a spiral shape, such as a braided wire. In a shielded cable (1) in which a braided wire (3) is wound in a spiral shape around the exterior of wires (2) and an insulating coating (4) sheathes the exterior of the braided wire (3), the leading edge part (5) of the braided wire (3) is linearly positioned in the wire axis direction along the inner face (4b) of the insulating coating, and the leading edge part (5) and edge parts (6, 7) of both sides of the braided wire (3) in the width direction thereof are crossed at an angle. The leading end portion (4a) of the insulating sheath (4) is peeled back, exposing the leading end braid portion (3a) of the braided wire (3), and at least a cross part (8) where the edge part (6) of one side in the width direction that is opposite to the end parts (2a) of the wires (2) crosses the leading edge part (5), forming an obtuse angle, is brought into contact with the interior face (4b) of the insulating sheath (4).

Description

Terminal structure of shielded wire and terminal processing method

The present invention relates to a shield wire terminal structure and a terminal processing method in which a shield conductor such as a strip-shaped braided wire is spirally wound and connected to the ground side.

FIG. 3 shows an embodiment of a conventional shield wire terminal structure (see Patent Document 1).

In this terminal structure, the insulating sheath 42 is melted by ultrasonic vibration in a state where the base end portion of the ground wire 43 is pressed against the insulating sheath (sheath) 42 of the shielded electric wire 41, and the conductive metal inside the insulating sheath 42 is made. The base end portion of the ground wire 43 is ultrasonically welded to the braided wire (shield conductor) 44, and the terminal 45 at the tip of the ground wire 43 is connected to the ground side. The insulating endothelium 46 is positioned inside the braided wire 44, and a terminal 48 is crimped to the core wire 47 inside the insulating endothelium 46 and connected to the main circuit.

FIG. 4 shows another form of a conventional shielded wire terminal structure (see Patent Document 2).

In this terminal structure, a conductive cloth (shield conductor) 53 is spirally wound around the outer sides of the plurality of covered electric wires 51 and the ground conductor 52, and the insulating outer skin 54 is attached to the outer side of the spiral conductive cloth 53. As shown by the arrows in FIG. 4, the tip 54 a of the insulating sheath 54 is peeled off, the exposed conductive cloth 53 is unwound, and a terminal (not shown) is connected to the exposed core wire (not shown) at the tip of each covered wire 51. The conductive cloth 53 accommodated in a connector housing (not shown) is rewound, and the tip 54a of the insulated outer sheath 54 is again covered with the conductive cloth 53, and the ground conductor 52 is insulated with the insulating outer sheath. 54 protrudes to the outside.

As another form of the conventional terminal structure of a shielded electric wire, for example, in Patent Document 3, an insulating inner skin is arranged outside the inner conductor of the coaxial cable, and a shield conductor such as a braided wire or a metal foil is arranged outside the insulating inner skin. In addition, it is described that a plurality of stranded conductors (outer conductor layers) are arranged in a spiral shape on the outside of the shield conductor, and an insulating sheath is arranged on the outside of the outer conductor layer. A metal foil (shield conductor) such as aluminum or copper is spirally wound around the outer periphery, a heat shrink tube is attached to the outer periphery of the metal foil, the core body is pulled out, and the end of the metal foil is unwound to the printed circuit board of the device It is described that a caulking connection is made.

Japanese Unexamined Patent Publication No. 11-135167 (FIG. 1) Japanese Unexamined Patent Publication No. 2007-194084 (FIGS. 4 to 9) Japanese Unexamined Patent Publication No. 2007-250421 (FIG. 1) Japanese Unexamined Patent Publication No. 2004-158618 (FIGS. 3 and 9)

In the terminal structure of the shielded electric wire shown in FIG. 3 (Patent Document 1), it is not necessary to peel off the insulating outer sheath 42 for exposing the braided wire (shield conductor) 44, but an ultrasonic welding machine is large. Equipment is required. Moreover, in the terminal structure of the shielded electric wire of FIG. 4 (Patent Document 2) and Patent Document 4, it is necessary to peel off the insulating outer sheath 54. For example, as compared with the exposure work of the shield conductor of Patent Document 3 The work of drawing out the spiral shield conductor 53 and extending it linearly is easy.

However, in the terminal structure of the shielded electric wire shown in FIG. 4 (Patent Document 2) and Patent Document 4, before the insulating outer skin 54 is peeled off or after the insulating outer skin 54 is peeled off, it is spiraled against the operator's intention. When the shield shield 53 is unraveled naturally, the amount of exposure of the shield conductor 53 cannot be stopped (the shield conductor 53 is excessively exposed beyond the necessary exposure length). It is necessary to rewind the shield conductor 53 to a necessary exposed length, or the shield conductor 53 is connected to the ground side while it is long, and the slack portion of the shield conductor 53 is damaged or interfered with the outside, or excessively damaged. There is a concern that the shielding (electromagnetic shielding) property of the shielded electric wire 55 is lowered by the amount exposed to the wire.

In view of the above points, the present invention provides a shielded wire in which a shield conductor such as a braided wire is wound in a spiral shape to facilitate the extension of the shield conductor. Shielded wire end structure that can prevent unintentional unwinding, and shielded wire end structure and shielded wire that can prevent unintentional unwinding of the spiral shield conductor even after the insulation sheath is peeled off An object of the present invention is to provide a terminal processing method.

The above object of the present invention can be achieved by the following constitution.
(1) A shielded electric wire in which a strip-shaped shield conductor is spirally wound on the outer side of an electric wire, and an insulating outer cover is attached to the outer side of the shield conductor, and a tip side portion of the shield conductor is the insulating outer cover A terminal structure of a shielded electric wire which is linearly positioned along the inner surface in the direction of the electric wire axis and intersects in a state where the tip side and the sides on both sides in the width direction of the shield conductor are inclined.

Due to the terminal structure of the shielded electric wire having the above configuration (1), the tip side of the shield conductor is positioned in parallel with the insulating outer skin and the wire axial direction before the insulation sheath is peeled off, and the tip side is on the inner surface of the insulating skin. It abuts by line contact or surface contact and exhibits high sliding frictional resistance. Thereby, inadvertent unraveling of the tip end portion of the shield conductor from the end portion of the insulating skin before peeling off the insulating skin is prevented. Therefore, it is possible to prevent the shield conductor from being damaged or damaged due to interference between the shield conductor unintentionally uncovered and the outside, and to eliminate the troublesome work of unwinding the shield conductor.
The shield conductor is a braided wire or a metal foil.

(2) In the terminal structure of the shielded electric wire configured as described in (1) above, the front end side of the insulating sheath is peeled off, the front end side of the shield conductor is exposed, and the width direction one side opposite to the front end of the electric wire is exposed. A terminal structure of a shielded electric wire in which at least a crossing portion that intersects an obtuse angle between the side portion and the tip end side portion is in contact with an inner surface of the insulating sheath.

According to the terminal structure of the shielded electric wire having the configuration (2) above, after the insulation sheath is peeled off, at least one side of the shield conductor tip side portion, that is, the corner portion is in front of the insulation sheath cutting tip. The inner surface abuts on the inner surface, and the frictional resistance thereby prevents the shield conductor from being inadvertently unwound from the cutting tip of the insulating shell. Therefore, the troublesome work of unwinding the shield conductor that has been unintentionally unraveled can be eliminated, and the shield conductor can be unwound at a specified length without causing any harmful slack on the ground side of equipment, vehicle bodies, etc. It can be grounded safely with good workability.

(3) A strip-shaped shield conductor is spirally wound around the outside of the electric wire, an insulating sheath is applied to the outside of the shield conductor, the tip end side of the insulating sheath is peeled off, and the tip end side of the shield conductor is exposed. A shield wire terminal treatment method, wherein a tip side of the shield conductor is linearly positioned along the inner surface of the insulating sheath in the direction of the wire axis, and is provided on both sides of the tip side and the shield conductor in the width direction. The tip side is cut and formed so as to intersect with the side in an inclined state, and intersects at an obtuse angle between the side on one side in the width direction opposite to the tip of the electric wire and the tip side. A shielded wire terminal treatment method in which a tip end side of the insulating outer skin is peeled off so that an intersecting portion comes into contact with an inner surface of the insulating outer skin.

According to the method for treating a shielded electric wire having the above configuration (3), after the insulation sheath is peeled off, at least one crossing portion, that is, the corner portion of the tip side of the shield conductor is in front of the cutting tip of the insulation sheath. The inner surface of the shield is brought into contact with it, and the frictional resistance caused thereby prevents the shield conductor from being inadvertently unwound from the cutting tip of the insulating sheath. Therefore, the troublesome work of unwinding the shield conductor that has been unintentionally unraveled can be eliminated, and the shield conductor can be unwound at a specified length without causing any harmful slack on the ground side of equipment, vehicle bodies, etc. It can be grounded safely with good workability.

FIG. 1 is a cross-sectional view showing an embodiment of a shield wire terminal structure and a terminal processing method according to the present invention. FIG. 2 is a front view showing one example of use in the terminal structure and terminal processing method of the shielded electric wire. FIG. 3 is a perspective view showing one embodiment of a conventional shield wire terminal structure. FIG. 4 is a front view showing another embodiment of a conventional shield wire terminal structure.

As shown in FIG. 1, the terminal structure of the shielded electric wire according to the present embodiment is a strip of conductive metal braided wire (shield conductor) 3 outside a plurality (two in the present embodiment) of signal wires (electric wires) 2. In the shielded electric wire 1 wound in a spiral shape in the state of a flat braided wire and covered with an insulating outer sheath (sheath) 4 on the outer side of the spiral braided wire 3, the tip portion (terminal portion on the leading end side) 4a of the insulating sheath 4 In the state where the wire is peeled off, the tip side 5 of the spiral braided wire 3 is positioned linearly along the inner surface 4b of the insulating skin 4 in the direction of the electric wire axis, and the tip side 5 and the spiral braided wire 3 The side portions 6 and 7 on both sides in the width direction intersect with each other in an inclined state, and one side portion 6 (that is, the side portion on one side in the width direction opposite to the front end (front end) of the signal line 2). 6) and an obtuse angle between the front end side 5 (the crossing angle is indicated by the symbol θ ₁ ) and the rear crossing portion 8 is the cutting tip ( Abruptly unraveling the braided wire 3 because the intersecting portion 8 is hooked (contacted) with the inner surface 4b of the insulating outer skin 4 and is located on the inner side (rear side) of the insulating outer skin 4 with respect to the cut end 4c. Protrusion is prevented.

The cutting tip 4c of the insulating outer skin 4 is cut in the electric wire radial direction substantially orthogonal to the electric wire axial direction. The tip side 5 of the braided wire 3 protrudes (exposes) forward from the cutting tip 4c of the insulating skin 4 except for the rear crossing portion 8. The other side (front side) 7 of the braided wire 3 located near the tip of the signal line 2 (that is, the side 7 on the one side in the width direction on the tip side of the signal line 2) and the tip side 5 cross each other at an acute angle. (The crossing angle is indicated by the symbol θ ₂ ), and the crossing portion 9 protrudes forward in the braided wire 3.

The outer peripheral surface 10 of the braided wire 3 is positioned without being exposed along the inner surface 4b of the insulating outer skin 4 at a position 180 degrees opposite to the distal end side portion 5 in the electric wire radial direction, and is approximately 180 ° opposite to the front end 10a of the outer peripheral surface 10. The rear crossing portion 8 of the front end side 5 is located at the front end side in a range between a position slightly ahead from the rear crossing portion 8 and the front end 10a of the outer peripheral surface 10 and the front crossing portion 9. The braided portion 3a protrudes (exposes) forward from the cutting tip 4c of the insulating skin 4.

In the present embodiment, the braided wire 3 is spirally wound at an inclination angle of approximately 30 to 40 °, and the adjacent front and rear winding

portions

3 ₁ and 3 ₂ extend back and forth over the entire length of the braided wire 3. It may be wrapped with some wrapping (overlapping). The braided wire 3 is formed in advance as a straight belt-like flat knitted wire, and the leading end of the braided wire 3 is cut in a slanted state (cut across the slanted state, not perpendicular to both sides 6 and 7) The braided wire 3 is spirally wound around the outside of the signal line 2 from the rear end to the front end 2a of the signal line 2 in the counterclockwise direction.

Here, when the front end side 5 of the braided wire 3 is cut perpendicularly to both sides 6 and 7, line contact is made with the inner surface 4 b of the insulating outer skin 4 like the inclined front end side 5. Or, since there is no surface contact portion (the rear crossing portion 8 comes into contact with the inner surface 4b of the insulating outer skin 4 not by line contact but by point contact), the hooking margin by the crossing portion 8 is small, and the hooking force is weak. Line 3 is easily unintentionally unraveled.

The two signal lines 2 protrude forward from the cutting tip 4c of the insulating sheath 4 through the inside of the braided portion 3a on the tip side of the braided wire 3, and the insulating coating (insulating endothelium) 2b on the tip side of each signal line 2 is the skin. The core wire 2c made of a plurality of strands is exposed, and a terminal (not shown) is connected to the core wire 2c by means such as crimping. The number of signal lines 2 is not limited to two. In the case of two, the cross section of the shielded electric wire 1 becomes an oval shape, and the cross section approaches a circle as the number increases.

The insulating skin 4 is an existing one made of synthetic resin. As a terminal processing method for a shielded wire according to the present embodiment, when the insulating sheath 4 is cut (peeled off), the insulating sheath 4 is cut so that the tip side portion 5 of the braided wire 3 covers the cutting tip 4c of the insulating sheath 4. . It is not always necessary to cut so that only the rear crossing portion 8 is hooked as shown in FIG. 1 (at least the rear crossing portion 8 is hooked), for example, the front half portion of the front end side portion 5 is exposed, The latter half portion of the tip side portion 5 may be caught (contacted) with the inner surface 4 b of the insulating outer skin 4. However, the longer the protruding (exposed) length of the signal line 2 is, the better the connection workability of the terminal (not shown) is. Therefore, it is also effective to cut so that only the rear intersection 8 is caught. After the insulating skin 4 is cut in the radial direction, the front end portion 4a of the insulating skin 4 is removed by pulling forward.

From the state shown in FIG. 1, the braided wire 3 on the exposed tip side of the braided wire 3 is gripped by hand and pulled forward, so that the spiral braided wire 3 is drawn out from the cut tip 4 c of the insulating skin 4 to an appropriate length. . Since the front end side 5 extends linearly in the direction of the electric wire axis, it is easy to grasp the intersection 9 on the front side of the front end side 5 with fingers, and the unwinding workability is good.
As shown in FIG. 2, a grounding terminal 11 is crimped and connected to the tip of the drawn-out braided wire 3, and is tightened and connected to a metal panel 12 such as a vehicle body with a bolt 13. The terminal 11 of this embodiment is an LA terminal (round plate terminal).

The pair of crimping pieces 11 a on the front side of the terminal 11 and the pair of crimping pieces 11 b on the rear side are both crimped to the tip of the braided wire 3. Connection is possible only with the front crimping piece 11a without the rear crimping piece 11b. A signal terminal (not shown) is connected to the signal line 2, and the signal terminal is accommodated in a connector housing, for example, as a connector (not shown) to a signal circuit (not shown) on the other side. Connected.

FIG. 1 shows a skinning process, and FIG. 2 shows a grounding process. The tip side 5 of the braided wire 3 in FIG. 1 is the inner surface 4b of the insulating skin 4 after the skinning process and before the grounding process. The tip side 5 is in contact with the inner surface 4b of the insulating outer skin 4 by the restoring force (spring force) in the diameter increasing direction of the braided wire 3 spirally wound. The workability problem that the braided wire 3 is excessively exposed against the operator's intention is eliminated at the stage before the braided wire 3 is drawn out to connect the terminal 11 to the tip. Therefore, the crimping connection of the terminal 11 to the braided wire 3 is performed smoothly with good workability, and the exposed length of the braided wire 3 in FIG. 2 is set to an optimum length, and the exposed length of the braided wire 3 is too long. The resulting interference with the outside, hooking, and accompanying damage are prevented.

In FIG. 1, the tip side 5 of the braided wire 3 is in line contact or surface contact with the inner surface 4 b of the insulating skin 4 (elongation of the tip side 5) before the tip 4 a of the insulating skin 4 is peeled off. For example, when the tip side 5 is cut in a direction orthogonal to the sides 6 and 7 on both sides in the width direction, the crossing portion 8 on the rear side of the tip side 5 is almost the same. Compared to abutting on the inner surface of the insulating outer skin 4 by point contact, the sliding frictional resistance between the tip side 5 and the inner surface 4b of the insulating outer shell 4 is increased, and the unraveling of the spiral braided wire 3 is prevented. Is done.

In the above embodiment, the braided wire 3 is used as the shield conductor. However, instead of the braided wire 3, a metal foil (not shown) such as a copper foil or an aluminum foil is used as in the braided wire 3 of FIG. It is also possible to adopt the form (structure having the tip side part 5 inclined with respect to the side parts 6 and 7 on both sides in the width direction). The configuration of the braided wire (shield conductor) 3 is also applied when an unillustrated electric wire (coaxial wire) made up of one core wire and the outer insulating endothelium instead of the plurality of signal wires 2 is arranged. Is possible.

Although the shield wire terminal structure and terminal processing method of the present invention have been described in detail and with reference to specific embodiments, the present invention is not limited to the above-described embodiments, and appropriate modifications, improvements, and the like are possible. It is.
This application is based on a Japanese patent application filed on Aug. 20, 2010 (Japanese Patent Application No. 2010-184787), the contents of which are incorporated herein by reference.

The terminal structure of the shielded wire and the terminal processing method according to the present invention can be used for grounding a shield conductor, such as a braided wire of a shielded wire, with a specified length and good workability, for example, on the body of an automobile.

1 Shielded wire 2 Signal wire (electric wire)
2a Front end 3 Braided wire (shield conductor)
3a Braided portion on the tip side 4 Insulating skin

4a Tip portion

4b Inner surface 5 Tip side portion 6 Side portion on one side in the width direction opposite to the tip of the electric wire 7 Side portion on the one side in the width direction on the tip side of the electric wire 8 Rear side Crossing (crossing obtuse angle)

Claims

A shielded electric wire in which a strip-shaped shield conductor is spirally wound on the outer side of the electric wire, and an insulating sheath is attached to the outer side of the shield conductor,
A shield in which the tip side of the shield conductor is positioned linearly along the inner surface of the insulating sheath in the direction of the electric wire axis, and the tip side and the sides on both sides in the width direction of the shield conductor intersect with each other Electric wire terminal structure.
The front end side of the insulating outer skin is peeled off, the front end side of the shield conductor is exposed, and at least a crossing portion that intersects the obtuse angle between the side portion on one side in the width direction opposite to the front end of the electric wire and the front end side portion The terminal structure of the shielded electric wire according to claim 1, wherein is in contact with an inner surface of the insulating outer skin.
A shielded electric wire in which a strip-shaped shield conductor is spirally wound on the outer side of the electric wire, an insulating outer skin is attached to the outer side of the shield conductor, the front end side of the insulating outer skin is peeled off, and the front end side of the shield conductor is exposed The terminal processing method of
The front end side of the shield conductor is linearly positioned along the inner surface of the insulating sheath in the direction of the electric wire axis so that the front end side and the sides on both sides in the width direction of the shield conductor intersect with each other in an inclined state. The tip side is cut and formed, and at least the intersecting portion that intersects at an obtuse angle between the side on one side in the width direction opposite to the tip of the electric wire and the tip side comes into contact with the inner surface of the insulating sheath Thus, the terminal processing method of the shielded electric wire which peels the front end side of the said insulation outer skin.