JP2006344487A - Earth wire connection structure of shield wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth wire connection structure of a shielded wire, where a connection fixture is connected and fixed to a shield layer strongly without operating clamping force in a compression direction to the shield wire itself. <P>SOLUTION: An earth wire 12 is connected to the middle of the shield wire 11, where the outer periphery of a signal conductor is coated with an insulating layer and a shield layer 11c and the outer periphery of the shield layer 11c is coated with a sheath 11d. A connection section 14 of the earth wire 12 is formed in the middle of the shield wire 11 by peeling the sheath 11d and exposing the shield layer 11c, the sheaths 11d positioned at both the sides of the connection section 14 are brought closer, an annular collar section 14a in which the shield layer 11c of the connection section 14 is inflated in the direction of the outer periphery to the axis of the shield wire 11 is formed, the collar section 14a has a pair of clamping plate sections 16a, 16b for compressing the collar section 14a from both the sides for clamping, and the connection fixture 14 to which the earth wire 12 is connected is fixed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ground wire connecting structure for a shielded electric wire, and more specifically, the ground wire is connected to a shield layer without tightening the shielded electric wire itself at an intermediate portion of the shielded electric wire.

Of the wire harnesses routed in the automobile, shielded wires are used particularly in places where shielding against noise is required. This shielded wire has a structure in which the signal conductor is covered with an insulating layer and a shield layer, and the outer periphery of the shield layer is covered with a sheath. Normally, it is necessary to connect a ground wire to the vehicle body for grounding. There is.
Patent Document 1 describes a structure in which a ground wire 2 is connected to a shield layer 1 a at an intermediate position of a shielded electric wire 1. That is, the outer sheath 1b is peeled off at a predetermined intermediate position of the shielded electric wire 1, the end of the ground wire 2 is disposed on the exposed shield layer 1a, and the shield layer 1a is formed using a separate terminal fitting 3. The ground wire 2 is fixed by crimping. Thereby, the ground wire 2 for vehicle body grounding can be connected to the required location of the shielded electric wire 1.

JP-A-8-340615

  The above-described conventional structure makes it possible to connect a ground wire to a required portion of the shielded electric wire. However, in order to stabilize the contact state and mechanical strength between the terminal fitting 3 to which the ground wire 2 is connected and the shield layer 1a. Needs to increase the compressive force applied to the shielded electric wire 1 by the terminal fitting 3. However, if the compressive force by the terminal fitting 3 is increased, the shield layer 1a and the signal conductor 1c may come into contact with each other or the signal conductor 1a may be disconnected. Further, in the case of a shielded electric wire in which the insulating layer 1d is made of a foam material, there is a concern that the possibility of the above problem occurring further increases.

  The present invention has been made in view of the above-described problems. The ground wire of the shielded electric wire that can firmly connect and fix the connection fitting to the shield layer without applying a tightening force in the compression direction to the shielded electric wire itself. It is an object to provide a connection structure.

In order to solve the above-described problems, the present invention has a structure in which the outer periphery of a signal conductor is covered with an insulating layer and a shield layer, and a ground wire is connected to an intermediate portion of a shielded electric wire formed by covering the periphery of the shield layer with a sheath. There,
The shield wire is peeled off at the middle portion of the shielded wire to expose the shield layer, thereby forming a ground wire connecting portion, and the sheath located on both sides of the connecting portion is brought close to shield the shield layer of the connecting portion. An annular flange that bulges in the outer peripheral direction with respect to the axis of the electric wire is formed, and the flange is provided with a pair of sandwiching plate portions that compress and clamp the flange from both sides and is connected to the ground wire Provided is a ground wire connection structure for a shielded wire, characterized in that a connection fitting is fixed.

  According to the above configuration, the shield layer and the ground wire are connected via the connection fitting, and the pair of clamping portions of the connection fitting are compressed from both sides of the flange portion of the shield layer that bulges in the outer peripheral direction. Since the holding and fixing are performed, the insulating layer and the signal conductor are not compressed even when the compressive force on the shield layer is increased when the connection fitting is fixed. Therefore, it is possible to expect a stable connection state and mechanical strength between the shield layer and the ground wire via the connection fitting without damaging the insulating layer and the signal conductor.

Specifically, the sandwiching plate portion is composed of a pair of metal plates formed separately, and the sandwiching plate portion is fixed by screws with bolts sandwiching the flange portion of the shield layer.
In this way, the connection fitting can be clamped and fixed to the shield layer by tightening the bolts, so that a stable connection state and mechanical strength can be maintained over a long period of time.

Further, the sandwiching plate portion is formed by bending a single metal plate, and an end portion of each sandwiching plate portion is provided with a crimping portion for connecting a ground wire, and the ground wire is connected in a state where the crimping portion is overlapped. You may make it clamp the collar part of the said shield layer with the said clamping board part simultaneously with crimping | bonding.
If comprised in this way, the compression clamping by the clamping board part from the both sides of a shield layer can be performed simultaneously with the crimping | compression-bonding process of the earth wire to the crimping part of a connection metal fitting. Therefore, the connection process of the ground wire can be further simplified.

  The both sandwiching plate portions are arranged with the flange portion of the shielded electric wire sandwiched from both sides, and a locking piece protruding from one sandwiching plate portion is bent toward the other sandwiching plate portion side to fix the both. May be. According to such a structure, both clamping board parts can be fixed, without requiring clamping members, such as a volt | bolt, separately.

  As is clear from the above description, according to the ground wire connection structure of the shielded electric wire of the present invention, when connecting the ground wire to the shield layer, the ground wire is connected to the flange portion of the shield layer bulged outward. The ground wire can be connected to the shield layer only by compressing the pair of holding plate portions connected to each other from both sides. Therefore, the connection force of the connection fitting does not directly act on the insulating layer or signal conductor with the connection of the ground wire, and high connection stability and mechanical strength are ensured while preventing damage to the insulating layer and signal conductor. be able to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of a shielded wire ground wire connection structure, which is composed of a shield wire 11 and a connection fitting 13 to which a ground wire 12 is connected. The shielded electric wire 11 includes a signal conductor 11a disposed at the center, an insulating layer 11b covering the outer periphery of the signal conductor 11a, a shield layer 11c including a braided wire disposed on the outer periphery of the insulating layer 11b, and a shield layer 11c. And a sheath 11d that covers the outer periphery of the sheath.

  The connection fitting 13 is made of a metal plate material for fixing the connection portion 14 of the shield layer 11c exposed at the intermediate portion of the shielded electric wire 11 to the flange portion 14a bulged toward the outer peripheral direction. As shown in FIG. 2, the connection fitting 13 includes a pair of separate holding plate portions 16a and 16b having U-shaped openings 15a and 15b capable of receiving the shielded electric wire 11, and one holding plate portion. A barrel portion 13a for crimping the core wire 12a of the ground wire 12 is provided at the base portion of 16a. The through holes 18a and 18b through which the bolts B for overlapping and fixing the clamping plate portions 16a and 16b can be inserted at intermediate positions of the opposing arm portions 17a and 17b of the clamping plate portions 16a and 16b, respectively. Is formed.

Next, the process of connecting the ground wire 12 to the shield layer 11c of the shielded electric wire 11 using the connection fitting 13 will be described.
First, as shown in FIG. 3A, a cut 19 is made in the sheath 11d at the intermediate required position of the shielded electric wire 11. Next, as shown in FIG. 3B, the connection portion 14 of the shield layer 11c is exposed by shifting the separated sheath 11d-1 to one side. Next, when the shifted sheath 11d-1 is gradually returned to the original position, as shown in FIG. 3 (C), the exposed connection portion 14 bulges in the outer peripheral direction, and finally, as shown in FIG. 3 (D). Thus, the annular flange 14a is formed.

  Next, as shown in FIG. 4 (A), the one clamping plate portion 16a of the connection fitting 13 is fitted into the outer periphery of the shielded electric wire 11 using the opening 15a to form the connection portion 14 of the shield layer 11c. It is made to contact | abut on one surface of the part 14a. A core wire 12a previously exposed at one end of the ground wire 12 is crimped to the clamping plate portion 16a via the barrel portion 13a, and the other end of the ground wire 12 is connected to a ground terminal (for connection to the vehicle body of the automobile). (Not shown) is crimped. Next, the other clamping plate portion 16b is similarly fitted to the outer periphery of the shielded electric wire 11 on the opposite surface side of the flange portion 14a, and is brought into contact with the opposite surface of the flange portion 14a as shown in FIG. In this way, after the collar portion 14a is clamped by the pair of clamping plate portions 16a and 16b, the bolt B is inserted through the through holes 18a and 18b, and the clamping plate portions 16a and 16b are tightened and fixed via the nut N. .

  According to the said structure, the collar part 14a which consists of the shield layer 11c is firmly compressed by the clamping board parts 16a and 16b from both sides, as shown to FIG. A stable electrical connection state and mechanical connection strength can be obtained. Further, the compressive force by the sandwiching plate portions 16a and 16b of the connection fitting 13 only acts on the flange portion 14a of the shield layer 11c, and other portions such as the shield layer 11c of the shielded electric wire 11, that is, the insulating layer 11b and the signal conductor 11a. There is no damage or other effects. Moreover, the collar part 14a can be easily formed only by making the cut | notch 19 in the arbitrary locations of the shield electric wire 11, and shifting the sheath 11d-1.

  FIGS. 5 and 6 show a second embodiment of the shielded wire ground wire connection structure, which differs from the first embodiment in that the sandwiching plate portions 26a and 26b are made of an integral metal plate as the connection fitting 23. FIG. That is, as shown in FIGS. 6A to 6C, the connection fitting 23 can be vertically stacked by bending a single metal plate at a central bent portion. Barrel portions 23a and 23b for crimping core wire 12a of ground wire 12 are formed at the bases of both sandwiching plate portions 26a and 26b, respectively. In this state, the ground wire 12 is crimped and connected.

Further, the openings 25a and 25b formed in the sandwiching plate portions 26a and 26b are formed in directions different from each other. When the sandwiching plate portions 26a and 26b are fitted into the outer periphery of the shielded electric wire 11, FIG. ), The sandwiching plate portions 26a and 26b are opposed to both surfaces of the flange portion 14a of the shield layer 11c so as to be sandwiched from both sides in a state where the distance between both is widened.
And in order to connect the ground wire 12 to the collar part 14a via the connection metal fitting 23, the clamping board parts 26a and 26b are made to oppose the both sides of the collar part 14a. Thereafter, as the barrel portions 23a and 23b are overlapped, the flange portion 14a is firmly sandwiched and fixed by the sandwiching plate portions 26a and 26b, and the ground wire 12 is crimped to the barrel portions 23a and 23b. By sandwiching the sandwiching plate portions 26a and 26b, the flange portion 14a can be firmly compressed and fixed by the sandwiching plate portions 26a and 26b from both sides (FIGS. 5A and 5B). Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.
Thus, in 2nd Embodiment, clamping members, such as a volt | bolt, are not required separately, and pinching plate part 26a, 26b is clamped and fixed with respect to the collar part 14a simultaneously with crimping | compression-bonding operation of the ground wire 12 to barrel part 23a, 23b. Therefore, workability for ground connection can be improved.

7 (A) and 7 (B) show a third embodiment of the shielded wire ground wire connection structure, which is composed of the clamping plate portions 36a and 36b of the connection fitting 33 provided separately as in the first embodiment. A barrel portion 33a for connecting the ground wire 12 to one base portion is provided. In order to fix the flange portion 14a of the shield layer 11c with the sandwiching plate portions 36a and 36b, the locking piece A protruding from the end portion of the one sandwiching plate portion 36b is fixed to the outer surface of the other sandwiching plate portion 36a. The two are fixed by crimping them so that they are folded back. In addition, since the other structure is the same as that of 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
Thus, in 3rd Embodiment, since clamping members, such as a volt | bolt, are not required separately, a number of parts can be reduced.

  In each of the above embodiments, an example in which a braided wire is used as the shield layer of the shielded electric wire has been described. However, it can be similarly applied to a horizontally wound shield layer. In the first embodiment, an example in which a nut for tightening a bolt is used has been described. However, a screw may be applied to the through hole of the clamping plate portion so that the nut is not used. Further, the fixing structure of the pair of clamping plate portions by the locking piece A shown in the third embodiment can be simultaneously employed for the purpose of further improving the connectivity as an additional configuration of the first embodiment and the second embodiment. .

The earth wire connection structure of the shield wire concerning the present invention is shown, (A) is a front view of a 1st embodiment, and (B) is a side view. It is a disassembled perspective view of the connection metal fitting of a 1st embodiment. (A)-(D) are figures which show the process of the shield layer with respect to a shielded electric wire. (A) (B) is a figure which shows the process of fixing a connection metal fitting with respect to the collar part of a shield layer, (C) is a principal part expanded sectional view of the clamp | tightening state. The earth wire connection structure of the shield electric wire of 2nd Embodiment is shown, (A) is a front view, (B) is a side view. (A) is a front view of the connection metal fitting of 2nd Embodiment, (B) is a side view, (C) is a side view of the state which accumulated the clamping board part and the barrel part. (A) is a disassembled perspective view of the connection metal fitting of 3rd Embodiment, (B) is a principal part enlarged view which shows the overlapping fixed state of a clamping board part. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Connection structure 11 Shielded electric wire 11a Signal conductor 11b Insulating layer 11c Shielding layer 11d Sheath 11d-1 Sheath 12 Ground wire 13, 23, 33 Connection metal fitting 13a, 23a, 23b, 33a Barrel part 14 Connection part 14a Gutter part 16a, 16b, 26a, 26b, 36a, 36b Holding plate part B Bolt N Nut A Locking piece

Claims (4)

The outer periphery of the signal conductor is covered with an insulating layer and a shield layer, and the ground wire is connected to the intermediate portion of the shielded electric wire formed by covering the outer periphery of the shield layer with a sheath,
The shield wire is peeled off at the middle portion of the shielded wire to expose the shield layer, thereby forming a ground wire connecting portion, and the sheath located on both sides of the connecting portion is brought close to shield the shield layer of the connecting portion. An annular flange that bulges in the outer peripheral direction with respect to the axis of the electric wire is formed, and the flange is provided with a pair of sandwiching plate portions that compress and clamp the flange from both sides and is connected to the ground wire A ground wire connection structure for shielded wires, characterized in that the connection fittings are fixed.   2. The shielded wire grounding device according to claim 1, wherein the sandwiching plate portion is composed of a pair of metal plates formed separately, and the sandwiching plate portion is fixed by screwing with a bolt across a flange portion of the shield layer. Wire connection structure.   The clamping plate portion is formed by bending a single metal plate, and each clamping plate portion is provided with a crimping portion for connecting a ground wire to the end portion of the clamping plate portion. The ground wire connection structure for a shielded electric wire according to claim 1, wherein the flange portion of the shield layer is sandwiched at the same time by the sandwiching plate portion.   The both sandwiching plate portions are arranged with the flange portion of the shielded electric wire sandwiched from both sides, and a locking piece protruding from one sandwiching plate portion is bent toward the other sandwiching plate portion side to fix the both. The ground wire connection structure for a shielded electric wire according to any one of claims 1 to 3.

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