JP2012014977A - Ground connection structure of shielded wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground connection structure of a shielded wire which eliminates a risk of short-circuiting between a signal line and a shield layer, and which is also excellent in manufacturing workability.SOLUTION: A ground connection structure of a shielded wire comprises: a shield protruding portion 4A in which a shield layer of a shielded wire 1 is exposed in a state protruding outward of a sheath 5; a ground annular part 10 which is arranged at a position surrounding an outer periphery of the shielded wire 1 and includes a housing chamber 12 having an opening 13 along an annular shape with a ground wire 7 housed therein; and a push-in member 20 which is inserted in the housing chamber 12 of the ground annular part 10 from the opening 13 together with the shield protruding portion 4A so as to bring the shield protruding portion 4A and the ground wire 7 into close contact with each other.

Description

  The present invention relates to a ground connection structure for a shielded wire.

  As this type of conventional ground wire connecting structure for shielded wires, there are one disclosed in Patent Document 1 (hereinafter referred to as “first conventional example”) and one disclosed in Patent Document 2 (hereinafter referred to as “second conventional example”). .

  The structure of the first conventional example is shown in FIG. In FIG. 15, at the end of the shielded electric wire 100, the jacket 104, the shield layer 103, and the insulating layer 102 are all peeled off to expose the signal line 101. The outer cover 104 is stripped off with the longest dimension, and the exposed shield layer 103 is folded back on the outer cover 104. A grounding crimping member 112 is attached to the folded portion of the shield layer 104 and the end of the ground wire 111 by caulking.

  In the first conventional example, the shield layer 104 and the ground wire 111 are connected by a grounding crimping member 112.

  A second conventional example is shown in FIGS. 16 and 17, the shield electric wire 100 is formed with a shield protrusion 103 </ b> A that is exposed in a state where the shield layer 103 protrudes outward from the jacket 104. The shield protrusion 103A is sandwiched between the pair of sandwiching portions 121 of the ground sandwiching member 120. Clamping portions 121 a are provided at the tip portions of the pair of sandwiching portions 121, respectively. As shown in FIG. 18, both the crimping portions 121a are crimped so as to crimp the ground wire 111 (see FIG. 18). A pair of clamping parts 121 are fixed by both the crimping parts 121a.

  In the second conventional example, the shield layer 103 and the ground wire 111 are connected by a grounding clamping member 120.

JP-A-8-340615 (see FIG. 4) Japanese Patent Laying-Open No. 2006-344487 (see FIGS. 5A and 5B)

  However, in the first conventional example, the crimping force of the grounding crimping member 112 acts on the insulating layer 102 of the shielded electric wire 100, and the insulating layer 102 is compressed and deformed. Therefore, the signal line 101 and the shield layer 103 may be short-circuited. is there.

  In the second conventional example, since the compressive force does not act on the insulating layer 102, the above-described problems do not occur. However, since the grounding clamping member 120 needs to be crimped, there is a problem that the manufacturing workability is poor. is there.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a ground connection structure for a shielded electric wire that does not cause a short circuit between a signal line and a shield layer and that has good manufacturing workability. And

  The present invention provides the shield projecting portion exposed in a state in which the shield layer of the shielded electric wire is projected outward from the outer sheath, and the housing having an opening along the annular shape, disposed at a position surrounding the outer periphery of the shielded electric wire. An annular part for grounding in which a ground wire is accommodated in a chamber, and a push in which the shield projecting part and the ground wire are brought into close contact with the housing part of the annular part for grounding together with the shield projecting part from the opening And a member.

  The annular part for grounding can be elastically deformed in the direction of expanding the opening, and the push-in member is inserted into the storage chamber by expanding the opening of the storage chamber by elastic deformation, and the push-in member is You may make it the said opening part of the said storage chamber return to the original magnitude | size after inserting in the said storage chamber.

  The grounding annular part may have a locking claw protruding into the storage chamber, and the pushing member inserted into the storage chamber may be locked to the locking claw.

  It is preferable that each of the grounding annular part and the pushing member has a notch part in which a part of the annular shape is opened.

  The grounding annular component preferably has a slit that opens to the opening on the inner peripheral wall.

  According to the present invention, since the shield protrusion and the ground wire are brought into close contact with each other in the grounding annular part, no external force acts on a portion other than the shield protrusion, and thus the signal line and the shield layer are short-circuited. Does not occur. What is necessary is just to insert a pushing member into the annular ring part for grounding set on the outer periphery of the shielded wire together with the shield protrusion, and there is no need to perform troublesome caulking. From the above, there is no fear that the signal line and the shield layer are short-circuited, and the manufacturing workability is good.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the earth connection structure of a shielded wire which shows 1st Embodiment of this invention. 1 shows a first embodiment of the present invention, (a) is a left side view of an annular part for grounding, (b) is a front view of the annular part for grounding, and (c) is a cross-sectional view taken along line AA of (b). is there. 1 shows a first embodiment of the present invention, in which (a) is a front view of a pushing member, and (b) is a left side view of the pushing member. 1st Embodiment of this invention is shown, (a)-(d) is a front view which shows the formation process of a shield protrusion part, respectively. It is a perspective view which shows 1st Embodiment of this invention and shows the manufacture process of a ground connection structure. It is sectional drawing which shows 1st Embodiment of this invention and shows the manufacture process of a ground connection structure. It is sectional drawing of the earth connection structure of a shield wire which shows 2nd Embodiment of this invention. The 2nd Embodiment of this invention is shown, (a) is a front view of the cyclic | annular component for earth | grounds, (b) is BB sectional drawing of (a). The 2nd Embodiment of this invention is shown, (a) is a front view of a pushing member, (b) is a left view of a pushing member. It is sectional drawing which shows 2nd Embodiment of this invention and shows the manufacture process of a ground connection structure. It is sectional drawing of the earth connection structure of a shield wire which shows 3rd Embodiment of this invention. 3A and 3B show a third embodiment of the present invention, in which FIG. 5A is a left side view of an annular part for grounding, FIG. 5B is a front view of the annular part for grounding, and FIG. is there. The 3rd Embodiment of this invention is shown, (a) is a left view of a pushing member, (b) is a front view of a pushing member, (c) is the DD sectional view taken on the line of (b). It is sectional drawing which shows 3rd Embodiment of this invention and shows the manufacturing process of a ground connection structure. It is a perspective view of the ground connection structure of a shielded wire, showing a first conventional example. It is a front view of the earth connection structure of a shield electric wire which shows a 2nd prior art example. FIG. 17 shows a second conventional example and is a view on arrow E in FIG. 16. It is a figure which shows a 2nd prior art example and shows the caulking process of both caulking parts.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1-6 shows 1st Embodiment of the earth connection structure of the shielded electric wire 1 which concerns on this invention. First, the structure of the shielded electric wire 1 will be described. As shown in detail in FIG. 4, the shielded electric wire 1 includes a conductor signal line 2, an insulating layer 3 covering the outer periphery of the signal line 2, and a shield layer disposed so as to cover the outer periphery of the insulating layer 3. 4 and an insulating jacket 5 covering the outer periphery of the shield layer 4. The shield layer 4 is formed of a conductor braided wire or metal foil.

  A shield projecting portion 4 </ b> A in which the shield layer 4 projects outward from the jacket 5 is provided at an intermediate position of the shielded electric wire 1 configured in this way. As shown in FIG. 1, the shield protrusion 4 </ b> A is connected to the ground wire 7 using a grounding annular component 10 and a pushing member 20. Details will be described below.

  As shown in FIG. 1, the grounding annular component 10 is disposed at a position surrounding the outer periphery of the shielded electric wire 1. As shown in detail in FIG. 2, the ground annular part 10 is made of a conductive metal and is an annular part having a notch portion 11 having an open part. The cross-sectional shape is generally an elliptical frame shape. The grounding annular component 10 has a storage chamber 12 therein. An opening 13 is formed in the storage chamber 12 along an annular shape. The edge portion 10c of the outer peripheral wall 10a constituting the opening portion 13 has an outwardly spread shape so that the pushing member 20 can be smoothly inserted. The grounding annular component 10 can be elastically deformed in the direction of increasing the width of the opening 13. A plurality of slits 14 are formed in the inner peripheral wall 10b of the ground annular part 10 at intervals in the circumferential direction. Each slit 14 opens into the opening 13.

  In the accommodation chamber 12 of the grounding annular part 10, the one end side of the ground wire 7 from which the jacket has been peeled, the shield projecting portion 4A, and the pushing member 20 are accommodated in close contact.

  The ground wire 7 is accommodated in the accommodating chamber 12 at one end side where the outer sheath is peeled off. The other end of the ground wire 7 is connected to the vehicle body when the shielded electric wire 1 is routed to a vehicle, for example.

  The shield protrusion 4 </ b> A enters the housing chamber 12 through each slit 14 of the grounding annular part 10 and is in close contact with the ground wire 7.

  As shown in detail in FIGS. 3A and 3B, the push-in member 20 is a ring-shaped component that is made of a conductive metal and has a cutout portion 21 that is partially opened. The pushing member 20 has a diameter that is slightly larger than the width of the opening 13 of the grounding annular part 10. Therefore, once the push-in member 20 is inserted into the storage chamber 12, the width of the opening 13 returns to the original size, so that the housed push-in member 20 does not fall out of the opening 13.

  Next, a procedure for assembling the ground connection structure of the shielded electric wire 1 will be briefly described. First, processing of the shielded electric wire 1 will be described. As shown to Fig.4 (a), it cuts in the outer cover 5 of the position which wants to connect the ground wire 7 in the intermediate location of the shielded electric wire 1 over the perimeter. Next, it moves in the direction in which the outer casing 5 on both sides of the notch a is a boundary. As a result, the shield layer 4 is exposed in the separated region of the outer jacket 5. Next, the moved outer jacket 5 is moved to the original position. Then, the exposed shield layer 4 bulges outward. When the outer jackets 5 on both sides have moved to the adjacent positions, the bulging shield layer 4 forms a shield protrusion 4A.

  Next, as shown in FIG. 5, one end of the ground wire 7 from which the jacket has been peeled is housed in the housing chamber 12 of the grounding annular component 10.

  Next, as shown in FIG. 6, the grounding annular part 10 is arranged on the outer periphery of the shielded electric wire 1 fixed by the jig 30 using the notch 11, and the grounding annular part 10 is formed in the slit 14. It moves to a position where the shield protrusion 4A enters.

  Next, the pushing member 20B is inserted into the accommodation chamber 12 of the ground annular part 10 from the rear surface of the shield protrusion 4A through the opening 13 thereof. Then, the shield protrusion 4A is pushed in and gradually enters the storage chamber 12. When the pushing member 20 is inserted to the position of the opening 13 of the storage chamber 12, the grounding annular component 10 is elastically deformed in the direction of increasing the width of the opening 13 and the pushing member 20 is allowed to be inserted. When the push-in member 20 is completely inserted into the storage chamber 12, the grounding annular part 10 is elastically deformed so that the width of the opening 13 is restored. As a result, the push-in member 20 is held in the storage chamber 12 without dropping from the opening 13. When the member 30 to be pushed in is completely housed in the housing chamber 12, the inside of the housing chamber 12 is in a state where there is almost no gap between the ground wire 7, the shield protrusion 4A, and the push member 20, and the ground wire 7 and the shield protrusion 4A are It is firmly attached.

  Note that when the grounding annular component 10 is disposed on the outer periphery of the shielded electric wire 1, the opening 13 of the grounding annular component 10 may be set at a position that is simply close to and opposed to the shield protrusion 4A. Then, the shield protrusion 4A may be inserted into the slit 14 in the process of inserting the pushing member 20 together with the shield protrusion 4A into the storage chamber 12 of the grounding annular component 10.

  As described above, the shield protrusion 4A exposed in a state where the shield layer 4 of the shielded electric wire 1 protrudes outside the outer sheath 5 and the position surrounding the outer periphery of the shielded electric wire 1 are arranged, and along the annular shape. The grounding annular component 10 in which the ground wire 7 is accommodated in the accommodation chamber 12 having the opening 13, and the push-in member 20 inserted into the accommodation chamber 12 of the grounding annular component 10 together with the shield protrusion 4 </ b> A from the opening 13. I have. Accordingly, since the shield protrusion 4A and the ground wire 7 are brought into close contact with each other in the grounding annular component 10, no compressive force acts on the insulating layer 3 of the shielded electric wire 1, so that the signal wire 2 and the shield layer 4 are short-circuited. Nothing happens. Further, it is only necessary to insert the pushing member 20 into the grounding annular part 10 set on the outer periphery of the shielded electric wire 1, and there is no need to perform troublesome caulking. From the above, there is no fear that the signal line 2 and the shield layer 4 are short-circuited, and the manufacturing workability is good.

  The grounding annular component 10 can be elastically deformed in the direction of expanding the opening 13, and the push-in member 20 is inserted into the storage chamber 12 by expanding the opening 13 of the storage chamber 12 by elastic deformation. After being inserted into the storage chamber 12, the opening 13 of the storage chamber 12 returns to its original size. Therefore, it is possible to prevent the pushing member 20 from falling out of the storage chamber 12 with a simple configuration.

  Since the annular part 10 for grounding has the notch part 11 by which the partial area | region of annular shape was opened, the setting to the outer periphery of the shielded electric wire 1 is easy.

  Since the grounding annular part 10 has the slit 14 opened to the opening 13 in the inner peripheral wall 10b, the shield protrusion 4A of the shielded electric wire 1 can easily enter the interior of the housing chamber 12 of the grounding annular part 10. Therefore, a stable contact state between the shield protrusion 4A and the ground wire 7 is obtained. The grounding annular part 10 is made of a conductive metal, and the shield protrusion 4A bites into the slit 14, so that the grounding annular part 10 and the shield protrusion 4A are in electrical contact with each other. As described above, since the shield projection 4A and the ground wire 7 are reliably connected even through the grounding annular component 10, the shield wire 4 can be reliably dropped to the ground potential.

(Second Embodiment)
7-10 shows 2nd Embodiment of the earth connection structure of the shielded electric wire 1 which concerns on this invention. The ground connection structure of the second embodiment is different from that of the first embodiment only in that the slit 14 is not provided in the ground annular part 10A, and the other configurations are all the same. . Accordingly, in FIGS. 7 to 10, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  Also in the second embodiment, the same operations and effects as those of the first embodiment can be obtained except for the operations and effects of the slit 14.

(Third embodiment)
FIGS. 11-14 shows 3rd Embodiment of the earth connection structure of the shielded electric wire 1 which concerns on this invention. In FIG. 11, as in the first and second embodiments, the shield protrusion 4A of the shielded electric wire 1 is in close contact with the ground wire 7 by the grounding annular component 10B and the pushing member 20B. And the configuration of the pushing member 20B are different. This will be described below.

  As shown in detail in FIG. 12, the grounding annular part 10B is made of a conductive metal and is an annular part having a notch 11 having an opening in a partial region, but the cross-sectional shape is substantially a square frame. It is a shape.

  The grounding annular component 10 </ b> B has a storage chamber 12 inside. An opening 13 is formed in the storage chamber 12 along an annular shape. On the outer peripheral wall 10a of the grounding annular part 10B, locking claws 15 by cutting and raising are provided at a plurality of positions at intervals. Each locking claw 15 protrudes into the storage chamber 12.

  As shown in detail in FIG. 13, the pushing member 20 </ b> B is made of a conductive metal, and is an annular part having a notch portion 21 with a partial area opened. The cross-sectional shape of the pushing member 20B is a substantially square frame shape. The width of the push-in member 20B is slightly smaller than the width of the storage chamber 12 of the grounding annular part 10B, and is set to a size that fits into the storage chamber 12. A storage chamber 22 is also formed in the pushing member 20B. An opening 23 is formed in the storage chamber 22 along an annular shape. The outer peripheral wall 20a of the pushing member 20B is provided with a plurality of locking holes 24 at intervals. When the locking claws 15 of the grounding annular part 10B are locked in the locking holes 24, the push-in member 20B does not fall out of the storage chamber 12 of the grounding annular part 10B.

  Next, a procedure for assembling the ground connection structure of the shielded electric wire 1 will be briefly described. Since the processing of the shielded electric wire 1 is the same as that in the first and second embodiments, the description thereof is omitted.

  When the processing of the shielded electric wire 1 is completed, the end of the ground wire 7 is accommodated in the accommodating chamber 12 of the grounding annular component 10B. Next, as shown in FIG. 14, the opening 13 is close to the outer periphery of the shielded electric wire 1 fixed by the jig 30 and to the shield protrusion 4 </ b> A by using the notch 11 of the grounding annular part 10 </ b> B. The grounding annular component 10B is set at the opposing position.

  Next, the pushing member 20B is inserted into the housing chamber 12 of the ground annular component 10B from the rear surface of the shield protrusion 4A through the opening 13. Then, the shield protrusion 4A is pushed in and gradually enters the storage chamber 12. When the pushing member 20B is completely inserted, the respective locking claws 15 of the grounding annular part 10B are locked in the locking holes 24 of the pushing member 20B. Thereby, the pushing member 20 </ b> B is held in the storage chamber 12 without dropping from the opening 13. When the member 20B to be pushed in is completely accommodated in the accommodation chamber 12, the inside of the accommodation chamber 12 is substantially free of gaps between the ground wire 7, the shield projection 4A, and the pushing member 20B (in other words, both the accommodation chambers 12 are provided). , 22, the ground wire 7 and the shield protrusion 4 </ b> A are substantially free from gaps), and the ground wire 7 and the shield protrusion 4 </ b> A are brought into close contact with each other.

  As described above, also in the third embodiment, as in the first and second embodiments, the shield protrusion 4A and the ground wire 7 are brought into close contact with each other in the ground annular component 10B. Since no compressive force acts on the signal line 2, the situation where the signal line 2 and the shield layer 4 are short-circuited does not occur. Further, it is only necessary to insert the pushing member 20B together with the shield protrusion 4A into the ground annular part 10B set on the outer periphery of the shielded electric wire 1, and it is not necessary to perform troublesome caulking. From the above, there is no fear that the signal line 2 and the shield layer 4 are short-circuited, and the manufacturing workability is good.

  The grounding annular component 10 </ b> B has a locking claw 15 protruding into the storage chamber 12, and the pushing member 20 </ b> B inserted into the storage chamber 12 is locked to the locking claw 15. Therefore, it is possible to reliably prevent the pushing member 20B from dropping out of the storage chamber 12.

  Since the annular part 10B for grounding has the cutout part 11 in which a partial region of the annular shape is opened, it is easy to set the shield wire 1 on the outer periphery.

  In addition, you may provide the slit opened to the opening part 13 similarly to the said 1st Embodiment in the internal peripheral wall 10b of the cyclic | annular component 10B for earth | ground. If a slit is provided in the inner peripheral wall 10b, the shield protrusion 4A of the shielded electric wire 1 can easily enter the interior of the storage chamber 12 of the grounding annular part 10B, so that the shield protrusion 4A and the ground wire 7 are stable. A close contact state is obtained.

DESCRIPTION OF SYMBOLS 1 Shield electric wire 4 Shield layer 4A Shield protrusion part 7 Ground wire 10, 10A, 10B Grounding annular parts 11, 21 Notch part 12 Storage chamber 13 Opening part 14 Slit 15 Locking claw 20, 20B Pushing member

Claims (5)

A shield protrusion exposed in a state in which the shield layer of the shielded electric wire protrudes outward from the jacket;
An annular part for grounding which is disposed at a position surrounding the outer periphery of the shielded electric wire, and an earth wire is accommodated in the accommodating chamber having an opening along the annular shape,
A grounding connection for a shielded electric wire, comprising: a pressing member that is inserted into the housing chamber of the grounded annular part together with the shield projecting portion from the opening to closely contact the shield projecting portion and the ground wire. Construction. The shield wire ground connection structure according to claim 1,
The annular part for grounding can be elastically deformed in the direction of expanding the opening, and the push-in member is inserted into the storage chamber by expanding the opening of the storage chamber by elastic deformation, and the push-in member is The shield wire ground connection structure, wherein the opening of the storage chamber returns to its original size after being inserted into the storage chamber. The shield wire ground connection structure according to claim 1,
The grounding annular part has a latching claw protruding into the housing chamber, and the pushing member inserted into the housing chamber is latched by the latching claw, and a ground connection of a shielded wire Construction. A ground connection structure for a shielded wire according to any one of claims 1 to 3,
The grounding connection structure for a shielded electric wire, wherein the grounding annular part and the push-in member each have a notch part in which a part of the annular shape is opened. A ground connection structure for a shielded wire according to any one of claims 1 to 4,
The grounding annular structure for a shielded electric wire, wherein the grounding annular part has a slit opened in the opening on an inner peripheral wall.

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