JPH10112924A - Termination structure of shield cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the length of the terminal of a shield cable, and facilitate the attachment to its opposite terminal of a connector terminal, by turning up the braid of a shield cable projected from the housing, and covering the periphery of the housing with it, and crowning it with a shield connection ring. SOLUTION: A braid 26 is turned up so that the end 26A projecting from the housing 2 at the tip of the housing 2 may cover the periphery of the housing. A shield connection ring 30 is processed and molded of metallic material excellent in spring property, and also a hole 31 to pass a cable through is opened at the center thereby being made in cap form. The shield connection ring 30 is provided with lock pieces 32 cut and erected inward at specified angles at a plurality of places on the circumferential face, and the lock piece 32 is put in the lock groove 6 provided at the housing 2 together with the end 26A of the braid 26. Accordingly, the shield connection ring 30 regulates the position of the braid 26 at the same time when it catches the end 26A of the braid 26 to the housing 2 in such a way as to pressure-weld it and fixes it to the housing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for terminating a shielded electric wire connected to various electric devices such as a motor mounted on an electric vehicle. The present invention relates to a terminal processing structure of a shielded electric wire which is variable and can adjust a necessary length for routing.

[0002]

2. Description of the Related Art Generally, when an electric power supply or a control signal wire is connected to an electric device mounted on a vehicle such as an electric vehicle, an electromagnetic shielding treatment or a waterproof treatment is often required. The electromagnetic shielding process is performed to prevent the operation of the device from becoming unstable due to various kinds of noise. The waterproof treatment is performed in order to prevent the electrical contact portions and the like from being stained by raindrops or the like that enter the device through the electric wires.

As a conventional technique relating to the electromagnetic shielding processing and the waterproofing processing, for example, a terminal processing structure 100 as shown in FIG. 8 is known. This terminal processing structure 100
The shielded wire 101 exposing the braid 104 is inserted into the waterproof grommet 115 in a press-fit state and inserted into a metal case 111 of an electric device or the like, and a core wire 102 covered with an insulating coating 103 is formed inside the metal case. It is extended from the end of the braid 104 for shield connection by the length necessary for drawing. The core wire 102 has a connection terminal 1 such as a crimp terminal for connection with a device-side connection terminal (not shown).
Numeral 10 is fixed.

That is, as a waterproofing measure, the above-described waterproof grommet 115 made of an insulating material such as synthetic rubber is put on the shielded electric wire 101 and the waterproof grommet 115 is fitted into the insertion portion of the metal case 111 in a press-fit state. This is achieved by inserting and sealing the space between the outer cover 105 and the metal case 111 in a watertight manner.

[0005] As measures against electromagnetic shielding, braid 1
By attaching a metal shield connection ring 118 connected to the waterproof grommet 115 to the tip of the waterproof grommet 115, the braid 1
This is achieved by connecting the metal case 111 and the metal case 111. That is, the shield connection ring 118 is
Inner tube portion 119A which is inserted between the insulating coating 103 coated with the braid and the braid 104 to achieve electrical connection with the braid 104
And a metal cap 111 and an outer cylinder portion 119 </ b> B electrically connected to the outer peripheral portion of the waterproof grommet 115 to form a double crown structure. Therefore, the electromagnetic shielding is performed when the braid 104 of the shielded electric wire 101 is electrically connected to the metal case 111 via the shield connection ring 118.

[0006]

However, in the above-mentioned terminal processing structure 100, as described above, the inner cylindrical portion 119A of the shield connection ring 118 has the insulating coating 103 and the braid 10
4 and the outer cylinder part 119B is grommet 1
15 and the metal case 111, the shield connection ring 118 acts to fix the entire terminal of the shielded wire 100, thereby restricting the movement of the shielded wire 100 in the axial direction. For this reason, when connecting the connection terminal 110 to the device-side connection terminal, if there is a shortage in the length of the shielded wire 100 required for routing in the case, there is a problem that the length cannot be adjusted.

In addition, since the shield connection ring 118 cannot be provided with a simple locking means between the waterproof grommet 115 and the waterproof grommet 115 having elasticity, the waterproof grommet 1 is not provided.
15, the connection between the braid 104 and the metal case 111 may be damaged. Therefore, in the conventional structure, for example, as shown in FIG. 9, a metal case 111 is provided with a stepped wire insertion port 112, and the shield connection ring 118 is brought into contact with the wire insertion port 112, thereby forming the shield connection ring 118. From the waterproof grommet 115 was prevented. However, in such a case, the metal case 1
Since the eleventh processing is required, there is a problem that the manufacturing cost including the case processing cost is increased. The present invention has been made in view of the above circumstances, and provides a shielded wire terminal treatment structure that enables adjustment of the amount of deflection at the terminal portion of the shielded wire, thereby facilitating braided terminal treatment and ensuring reliable It is intended to improve the reliability of the shielding effect.

[0008]

According to an aspect of the present invention, there is provided a shielded wire terminal treatment structure, comprising: a housing fixedly attached to a mounting portion through a shielded wire; A shield connection ring through which a shielded wire passes, and a braid of the shielded wire protruding from the housing is folded back on the outer peripheral surface of the housing, and the shield connection ring is pressed against the outer peripheral surface of the housing to press the braid. It is characterized in that it is externally fitted to the housing.

Alternatively, a locking groove may be provided on the outer peripheral surface of the housing, and a locking piece lockable to the locking groove may be provided on the shield connection ring. Alternatively, an insulation ring for preventing conduction that prevents contact between the connection terminal connected to the core wire of the shielded wire and the shield connection ring is attached to an end of the insulation coating of the shielded wire protruding from the housing. May be a feature. Alternatively, an annular seal member may be disposed between an outer peripheral surface of the housing and a mounting portion of the housing. Alternatively, a waterproof plug may be provided between the outer covering of the shielded electric wire and the housing.

[0010] In addition, according to the invention, there is provided a terminal processing structure for a shielded electric wire, wherein the shielded electric wire is disposed on a housing fixedly attached to a mounting portion through a shielded electric wire. A metal shell partially engaged between the insulating coating and the braid of the shielded electric wire, and a shield connection ring that is mounted on the housing and penetrates the shielded electric wire, wherein the shield connection ring is formed of the metal. The outer peripheral surface of the shell and the inner peripheral surface of the mounting portion each have a spring piece elastically in contact therewith and are engaged with the housing.

The shield connection ring is mounted on the upper side of the braid folded back on the outer peripheral surface of the housing, and the braid is sandwiched between the outer peripheral surface of the housing and the shield connection ring. When the braid is brought into contact with the metal case, the braid is electrically connected to the metal case, and is grounded through the metal case. In addition, since only the braid is fixed to the outer peripheral surface of the housing, the braid is deformed so as to increase the amount of folding, for example, when the core wire is pulled in the terminal direction, and the length protruding from the metal case is extended. You.

Also, unlike the waterproof grommet of the conventional structure, the shield connection ring is attached to a rigid and non-deformable housing, so that it can be fixed in a stable state by providing a locking means. Also, if an insulating ring made of an insulating material for preventing conduction is attached to the end of the insulating coating exposing the core wire, the shield connection that occurs when the shielded wire is pulled out from the rear end of the housing Conductive contact between the ring and the connection terminal can be prevented.

[0013] Further, if a metal shell is provided which is fitted to the insulation coating, and the spring piece of the shield connection ring is elastically in contact with the metal shell and the mounting portion and is mounted on the housing, the shield piece extends in the axial direction of the shielded electric wire. Even if the metal shell moves with the movement of the braid, the braid connected to the metal shell,
Electrical conduction with the mounting portion is always maintained via the shield connection ring.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a shielded wire terminal processing structure according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a terminal treatment structure of a shielded wire according to the present invention, FIG. 2 is a detailed view of a part A of FIG. 1, FIG. 3 is a detailed view of a part B of FIG. FIG. 5 is a front view, and FIG. 5 is an external perspective view of the terminal processing structure. In the terminal treatment structure 1 for a shielded electric wire, a substantially cylindrical housing 2 into which the shielded electric wire 20 is inserted, and a braid 26 of the shielded electric wire 20 inserted through the housing 2 are folded on the outer peripheral surface of the housing at the distal end portion of the housing 2. In this state, a shield connection ring 30 attached to the housing 2 is provided.

The housing 2 is provided with a mounting flange 4 on the outer peripheral surface. The flange 4 is attached to the housing 2 by inserting the front end of the housing 2 into a mounting portion, for example, an electric wire insertion port 51 of a motor case 50. It is fixed to the motor case 50 with bolts 52. On the outer peripheral surface of the housing 2, a locking groove 6 and an annular groove 8 are sequentially recessed from a tip end portion fitted into the motor case 50 toward the flange portion 4. The annular groove 8 is formed over the entire circumference of the housing 2.
O-ring 10 as a sealing member for hermetically sealing the gap between 0 and
Is fitted.

In the shielded electric wire 20, at the terminal 29 inserted into the housing 2, the outer coating 28 exposes the braid 26, the insulating coating 24, and the core wire 22 in this order.
A connection terminal 55 connected to a motor terminal (not shown).
Are connected by crimping (see FIG. 4). The braid 26 is shown in FIG.
As shown in FIG. 3, an end 26A protruding from the housing 2 at the tip end of the housing 2 is folded back so as to cover the outer peripheral surface of the housing.

The shield connection ring 30 is formed by processing a metal material having excellent spring characteristics, and is formed in a cap shape with a hole 31 through which an electric wire penetrates opened at the center. Locking pieces 32 cut and raised inward at a predetermined angle are provided on the shield connection ring 30 at a plurality of locations on the circumferential surface, and the locking pieces 32 are provided on the housing 2 together with the end 26A of the braid 26. Inserted into the locking groove 6. Accordingly, the shield connection ring 30 is fixed to the housing 2 by sandwiching the end 26A of the braid 26 folded back on the outer peripheral surface of the housing so as to press the same, and at the same time, restricts the position of the braid 26 so as not to be displaced.

The shield connection ring 30 has a structure shown in FIG.
As shown in the figure, a plurality of spring pieces 34 projecting outward are provided on the circumference. The spring piece 34 is connected to the motor case 50.
Is resiliently connected to the electric wire insertion port 51 of FIG. Thereby, the braid 26 of the shielded electric wire 20 is grounded via the motor case 50.

An insulating ring 12 made of an insulating material for preventing conduction is fitted into an end portion 24A of the insulating coating 24 protruding from the front end portion of the housing 2 of the shielded electric wire 20. This insulating ring 12 is a shielded electric wire 20
Is pulled backwards, for example, as shown in FIG.
Even if the connection terminal 55 is brought close to the shield connection ring 30, the connection between the connection terminal 55 and the shield connection ring 30 is prevented, and the two are always kept in a non-conductive state.

The shielded electric wire 2 in the housing 2
A waterproof plug 13 for preventing raindrops or the like from penetrating into the housing 2 from the outer rear end side of the housing 2 is fitted to the outer coating 28 of the housing 2, and a shielded electric wire drawn out from the rear end side of the housing 2 At a location 20, a corrugated tube 14 for protecting the electric wire is mounted. That is, the shielded electric wire 20 is inserted into the housing 2 in a state of penetrating the corrugated tube 14.

The corrugated tube 14 is connected to the housing 2
The holder 16 is configured to have a locking projection 16A that is partially fitted to the outer surface of the housing and supports the end of the tube by fitting it inside. The holder 16 comes into contact with the waterproof plug 13 and regulates the escape of the waterproof plug 13.

The shielded electric wire 2 is located at a position substantially corresponding to the rear end of the housing 2 and drawn out of the housing 2.
At a position of 0, a stopper ring 18 that regulates a relative axial displacement between the corrugated tube 14 and the shielded electric wire 20 is crimped to the outer coating 28 of the shielded electric wire 20.

As described above, according to the shielded wire termination structure described above, the shielded wire 20 protruding from the housing 2 has the braid 26 folded back to cover the outer peripheral surface of the housing 2, and the shield connection ring 30 is further covered thereon. Since the end portion 26A of the braid 26 is locked together with the locking piece 32 in the locking groove 6 of the housing 2, the shield wire 20 is movable in the axial direction by increasing or decreasing the amount of bending caused by the folding of the braid 26. Becomes Therefore, for example, when the terminal 29 is pulled in the terminal direction, the braid 26 is deformed and the length of the terminal 29 is adjusted, so that the length necessary for the routing of the shielded electric wire 20 when the connection terminal 55 is connected to the motor. Can be secured.

The shield connection ring 30 is formed of a braid 26
The terminal processing structure 1 can be easily assembled, and the terminal processing can be performed reliably.
A locking groove 6 is provided on the outer peripheral surface of the housing 2, and a locking piece 32 lockable in the locking groove 6 is connected to the shield connection ring 3.
0, the shield connection ring 30 can be fixed to the housing 2 without providing a stepped hole or the like in the motor case 50 as in the prior art, and the machining of the motor case 50 is not required, thereby increasing the cost. Can be suppressed. Furthermore, since the waterproof plug 13 and the O-ring 10 are disposed between the housing 2 and the shielded electric wire 20, it is possible to reliably prevent raindrops or the like from entering the motor case 50 from the outside.

Next, another embodiment of the shielded wire terminal processing structure according to the present invention will be described. FIG. 6 is a cross-sectional view showing another embodiment of the structure for terminating the shielded electric wire, and FIG. Note that the same reference numerals are used for the same parts and parts as in the previous embodiment. The shielded wire terminal treatment structure 1 </ b> A includes a substantially cylindrical housing 2 through which the shielded wire 20 is inserted, an outer sheath 24 of the shielded wire 20 inserted through the housing 2, and an insulation coating 24 of the shielded wire 20. And braid 26
A substantially cylindrical metal shell 60 partially engaged between
And a shield connection ring 70 which is mounted on the front end of the housing 2 and through which the shielded electric wire 20 penetrates.

The housing 2 is attached to the motor case 50 with its distal end fitted into a mounting portion, for example, an electric wire insertion opening 51 of the motor case 50. On the outer peripheral surface of the housing 2, a locking groove 6 and an annular groove 8 are sequentially recessed from a front end portion to be fitted into the motor case 50 toward a rear end portion. The annular groove 8 is formed over the entire circumference of the housing 2, and an O-ring 10 as a seal member for sealing the space between the housing 2 and the motor case 50 is fitted in the annular groove 8.

A plurality of locking grooves 6 are provided at predetermined intervals in the circumferential direction of the housing 2, and the outer peripheral surface and the inner peripheral surface of the front end portion of the housing corresponding to the locking grooves 6 are described later. The recesses 3 and 5 for accommodating the spring pieces of the shield connection ring 70 are provided. That is, the locking grooves 6 and the depressions 3 are provided alternately in the circumferential direction on the outer peripheral surface. The depressions 3 and 5 are provided so as to face positions on the inner peripheral surface and the outer peripheral surface, respectively.

In the shielded electric wire 20, at the terminal 29 inserted into the housing 2, the outer covering 28 exposes the braid 26, the insulating covering 24, and the core wire (see FIG. 1) in this order.
A connection terminal connected to the motor terminal portion is crimp-connected to the core wire as in the previous embodiment.

A metal shell 60 has one end of the insulating coating 24 and the braid 26 exposed at the terminal 29.
In a state of being engaged between the braid 26 and the braid 26, it is externally fitted to the insulating coating 24. At one end of the metal shell 60, a pressure contact portion 62 having a slightly reduced diameter in the radial direction is formed.
Numeral 2 presses the outer peripheral surface of the insulating coating 24 to prevent the metal shell 60 from inadvertently moving on the shielded electric wire 20.
In addition, the braid 26 arranged on the press contact portion 62 is
2 is held in a strongly pressurized state by a clip 64 having a cross-sectional shape substantially coinciding with FIG. Note that the other end of the metal shell 60 extends toward the front end of the housing 2.

The shield connection ring 70 is formed of a metal material having excellent spring characteristics, and is formed in a cap shape with a hole 71 through which the electric wire and the metal shell 60 penetrate open at the center. Locking pieces 72 cut and raised inward at a predetermined angle are provided on the shield connection ring 70 at a plurality of locations on the circumferential surface.
No. 0 is fixed to the housing 2 by inserting the locking piece 72 into the locking groove 6.

The shield connection ring 70 is provided with a plurality of first spring pieces 74 protruding outward and a plurality of second spring pieces 76 protruding inward on the circumference. These spring pieces 74 and 76 are accommodated in the recesses 3 and 5 of the housing 2 so as to be elastically deformable. The first spring piece 74 elastically contacts the wire insertion port 51 of the motor case 50,
The second spring piece 76 elastically contacts the outer peripheral surface of the metal shell 60. In particular, the second spring piece 76 is slidably provided on the outer peripheral surface of the metal shell 60. Therefore, shielded wire 2
When 0 is pulled and moves in the axial direction, the metal shell 60 that moves with the shielded electric wire 20 and the second spring piece 76 are always electrically connected. This allows
The braid 26 of the shielded electric wire 20 is grounded via the metal shell 60, the shield connection ring 70, and the motor case 50.

At the rear end of the housing 2, a corrugated tube 14 for protecting electric wires is held and mounted on a holder 17 which is engaged with the housing 2. A waterproof plug 13 is provided between the housing 2 and the outer cover 28.

According to the shielded wire end treatment structure described above, the shield connection ring 70 elastically contacts the first spring piece 74 to the motor case 50 and also connects the second spring piece 76 to the braid 26. Conducted metal shell 6
Since it is always in contact with 0, even if the electric wire is pulled in the terminal direction, for example, the conduction state between the braid 26 and the motor case 50 is maintained, and the reliability of the shielding effect is secured. When a metal shell is provided, the metal shell
In the prior art, it is common to be integrated with the housing by insert molding.
Since the housing 2 is formed separately from the housing 4, the molding of the housing 2 is not complicated. That is, the moldability of the housing 2 is not impaired.

[0034]

As described above, according to the present invention,
In the case where the braid of the shielded wire protruding from the housing is folded back to cover the outer peripheral surface of the housing and the shield connection ring is mounted thereon, only the braided shielded wire is locked to the housing, Axial movement can be performed. Therefore, the length of the shielded wire at the end can be adjusted according to the routing of the shielded wire, and it becomes easy to attach the connection terminal to the mating terminal (not shown). Further, since the shield connection ring is merely put on the braid, the assembly becomes easy. Alternatively, a locking groove is provided on the outer peripheral surface of the housing, and a locking piece that can be locked in the locking groove is provided in the shield connection ring, so that a stepped hole or the like is not provided in the motor case as in the related art. Since the shield connection ring can be fixed to the housing, the shape of the motor case can be simplified and cost increase can be suppressed. Alternatively, since a waterproof plug and an O-ring are arranged between the housing and the shielded electric wire,
Water can be reliably prevented from entering the motor case. Further, according to the present invention, in the case where the metal shell and the shield connection ring elastically slidably contacting the metal shell and being connected to the motor case are provided, the shielded wire can be moved, A reduction in the shielding effect can be prevented. Alternatively, occurrence of inconvenience such as poor molding of the housing can be avoided by separating the metal shell.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a shielded wire terminal processing structure according to the present invention.

FIG. 2 is a detailed view of a portion A in FIG.

FIG. 3 is a detailed view of a portion B in FIG. 1;

FIG. 4 is a front view of a shielded wire terminal processing structure according to the present invention.

FIG. 5 is an external perspective view of a shielded wire terminal processing structure according to the present invention.

FIG. 6 is a cross-sectional view showing another embodiment of the present invention.

FIG. 7 is an enlarged view of a main part of FIG. 6;

FIG. 8 is a sectional view showing a conventional example.

FIG. 9 is a partial sectional view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A Shield wire terminal processing structure 2 Housing 3, 5 dent 6 Lock groove 8 Annular groove 10 O-ring 12 Insulation ring 13 Waterproof plug 14 Corrugated tube 16 Holder 18 Stopper ring 20 Shield wire 22 Core wire 26 Braid 30, 70 Shield Connection ring 32 Locking piece 34, 74, 76 Spring piece 50 Motor case (mounting part) 55 Connection terminal 60 Metal shell

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirotaka Fukushima 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Yazaki Parts Co., Ltd. (72) Toshiaki Hasegawa 206-1 Nunobikihara, Harihara-cho, Haibara-gun, Shizuoka Parts Co., Ltd.

Claims (6)

[Claims] 1. A braided shield wire protruding from the housing, comprising: a housing fixedly attached to a mounting portion through a shielded wire, and a shield connection ring which is fitted to the housing and penetrates the shielded wire. A shield connection ring, wherein the shield connection ring is externally fitted to the housing by pressing the braid against the outer circumference of the housing. 2. The shielded electric wire according to claim 1, wherein a locking groove is provided on an outer peripheral surface of the housing, and a locking piece lockable with the locking groove is provided on the shield connection ring. Terminal processing structure. 3. An insulation ring for preventing conduction, which prevents contact between a connection terminal connected to a core wire of the shielded wire and the shield connection ring, at an end of the insulation coating of the shielded wire protruding from the housing. The structure for terminating a shielded electric wire according to claim 1, wherein the terminal is attached. 4. The structure according to claim 1, wherein an annular seal member is disposed between an outer peripheral surface of the housing and the mounting portion. 5. The terminal treatment structure for a shielded electric wire according to claim 1, wherein a waterproof plug is disposed between an outer coating of the shielded electric wire and the housing. 6. A housing fixedly attached to a mounting portion through a shielded electric wire, and externally fitted to an insulating coating of the shielded electric wire, and partially engaged between the insulating coating and a braid of the shielded electric wire. A metal shell; and a shield connection ring which is mounted on the housing and through which the shielded electric wire passes, wherein the shield connection ring resiliently contacts an outer peripheral surface of the metal shell and an inner peripheral surface of the mounting portion. A terminal wire treatment structure for a shielded electric wire, the terminal treatment structure comprising: