JP3074437B2 - Terminal treatment structure of shield braid - Google Patents

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 knitted wire connected to various electric devices such as a motor mounted on an electric vehicle, and more particularly, to a shield connection process for a shielded knitted wire and waterproofing. The present invention relates to a terminal processing structure for a shield braided wire which can easily and reliably achieve processing with a minimum number of parts.

[Prior art]

2. Description of the Related Art In general, when an electric power supply or control signal wire is connected to an electric device mounted on a vehicle such as an electric vehicle, an electromagnetic shield connection process and a waterproof process are often required. On the other hand, the electromagnetic shield connection processing is required to prevent the operation of the device from becoming unstable due to noise. The other waterproof treatment is required in order to prevent raindrops and the like from entering the device from the insertion portion of the electric wire, thereby preventing electric contact portions and the like in the device from being soiled.

FIGS. 5A and 5B show an example of a conventional electric wire connection structure having been subjected to an electromagnetic shield connection process and a waterproof process as described above. FIG.
(A) shows a crimp terminal 32 at the end of the core wire.
Is inserted through the wire insertion hole 30a provided in the metal case 30 of the electric device into the case. Then, the crimp terminal 32 is screwed to a device-side connection terminal (not shown) in the metal case 30 to achieve electrical connection with the device. Further, the waterproof sealing material 33 is filled around the periphery of the electric wire insertion hole 30a so as to close the gap between the electric wire insertion hole 30a and the covered electric wire 31, thereby ensuring waterproofness in the electric wire insertion portion. Further, a shield tape 34 is wound around the waterproof seal material 33 and the covered electric wire 31 to perform electromagnetic shielding.

FIG. 5B shows an example in which a braided shield wire 35 is used in place of the insulated wire 31. The shield braided wire 35 is an electric wire having a configuration in which a braided wire (drain wire) 37 for shielding is covered around a core wire 36 coated with insulation, and further, an insulation coating 38 is provided on the outer periphery. The use of such a shield braided wire 35 eliminates the troublesome winding work of the shield tape 34, and makes it possible to greatly improve the workability.

However, when the shield braid 35 is used, the shield braid 37 of the shield braid 35 must be electrically connected to the metal case 30. FIG.
In the case of FIG. 3B, an electric connection between the knitted wire 37 and the metal case 30 can be obtained by tightly fitting the knitted wire 37 into the wire insertion hole 30a. However, in such a connection structure, the connection between the braided wire 37 and the metal case 30 is unstable, and the coating 3
When plastic deformation occurs in the braided wire 6 or the braided wire 37, there is a problem that the shielding performance is reduced.

[0006] Therefore, a terminal processing structure of the shield knitting wire shown in FIGS. 6 to 8 has been proposed. In the case of this shield braided terminal treatment structure, the core wire 4a of the shield braided wire 4 is exposed by peeling the inner insulating coating layer 4b covering it over a predetermined length. Further, the braided wire 4c for shielding connection, which covers the inner insulating coating layer 4b, is
It is folded back on the outer coating layer 4d cut at a position slightly lower than b. Then, a rubber stopper 6 having a locking projection 6a, a waterproof rubber stopper 5, and a metal connecting member 7 were mounted on the knitted wire 4c and the outer coating layer 4d, and the tip of the shield knitted wire 4 was further exposed. The terminal fixture 1 is fixed on the core wire 4a.

[0007] A connector housing 8 is externally fitted to the terminal fixture 1. The connector housing 8 includes a cylindrical housing body 9 that is fitted to the terminal fixing bracket 1,
A metal shell having a flange 11 externally fitted to the housing main body 9, a cylindrical main body 10a sandwiched between the housing main body 9 and the flange 11, and a flange 10b exposed on the front side of the flange 11. 10 and housing body 9
And a C-ring 13 for engaging the terminal fixture 1 inserted therein to prevent the terminal fixture 1 from coming off the housing body 9.

The terminal fixing bracket 1 has a female screw 2a formed on the front end face for screwing the connection terminal 18 on the device side, and a locking groove in which a C-ring 13 is engaged with the outer peripheral part on the front end side. 2b is formed. The base end face is provided with a core wire insertion hole 3a for inserting the core wire 4a. After the core wire 4a is inserted into the core wire insertion hole 3a, the core wire insertion hole 3a is inserted.
It is fixed to the core wire 4a by caulking the outer periphery of a. Further, the connecting member 7 is for bringing the knitted wire 4c into electrical contact with the metal case 14 of the electric device via the metal shell 10 described above, and is connected to the tubular portion pressed against the main body 10a of the metal shell 10. It has a structure in which a cylindrical portion pressed against the line 4c is integrally formed.

When the connector housing 8 is externally fitted on the terminal fixture 1, the waterproof rubber plug 5 is provided with a cylindrical portion of the flange 11 extending rearward and an outer coating layer of the shield braided wire 4. 4d is closed to keep the space between the connector housing 8 and the shield braided wire 4 watertight. On the other hand, the housing main body 9 of the connector housing 8 has a cylindrical shape whose front end is inserted into an electric wire insertion hole 15 formed in the metal case 14. A seal ring 12 for waterproofing between the wire 9 and the wire insertion hole 15 is mounted. Further, when the flange 11 externally fitted to the housing body 9 is screwed to the metal case 14 by the bolt 20,
The flange 10b of the metal shell 10 is formed so as to be securely pressed against the metal case 14.

As shown in FIG. 7, in the above-described terminal processing structure of the shield braid, the connector housing 8 is assembled to the terminal fixture 1 which is crimped to the core wire 4a of the shield braid 4. Next, as shown in FIG. 8, the tip of the housing body 9 of the connector housing 8 is
The flange 11 is fixed to the metal case 14 by bolts 20. If the connection terminal 18 on the device side is screwed to the tip of the terminal fixing bracket 1 with the bolt 21, the electrical connection between the core wire 4 a of the shield knitted wire 4 and the connection terminal 18 on the device side, and the knitting of the shield knitted wire 4 are performed. The shield connection process for electrically connecting the wire 4c to the metal case 14 and the waterproof process between the shield braided wire 4 and the wire insertion hole 15 are reliably achieved.

[0011]

However, the terminal processing structure of the shield braided wire shown in FIGS. 6 to 8 requires a large number of parts and requires high precision cutting. Therefore, there is a problem that the cost is increased.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is possible to easily and reliably perform shield connection processing and waterproof processing of a shield knitted wire, and furthermore, a shield knitted wire that uses a small number of parts and is inexpensive. To provide a terminal processing structure.

[0013]

SUMMARY OF THE INVENTION It is an object of the present invention to insert a core wire of a shield knitted wire through a wire insertion hole provided in a metal case of an electric device into the inside of the metal case and connect the device side in the metal case. A device for connecting a shield braid that is connected to a terminal and electrically connects the braid of the shield braid to the metal case, and watertightly closes a gap between the shield braid and the wire insertion hole. the a terminal processing structure of the shield braid to facilitate, inserted into the wire insertion hole
The end of the knitted wire to be inserted and the outer coating covering the knitted wire
The inner peripheral part has a coating contact part that adheres water tightly to
Water tightly in contact with the inner surface of the wire insertion hole or its periphery.
A substantially cylindrical waterproof grommet made of an insulating elastic material having an outer peripheral portion with a case close contact portion, and an inner cylindrical portion having a core wire.
Inserted between the insulating coating and the braided wire to make electrical contact with the braided wire and to protrude toward the inner peripheral surface side of the wire insertion hole.
Conductive outer tubular portion having a curved shaped contact piece of the metal case
Presses against the wire insertion hole to make electrical contact, and the waterproof grommet
A shield connection ring made of a conductive material of the double crown structure that covers the tip outer peripheral portion of the bets, before to secure the metal case
The grommet can be attained by a terminal processing structure of a shield knitted wire, which comprises a grommet pressing means externally fitted to an outer peripheral portion of the waterproof grommet .

[0014]

[0015]

[0016]

[0017]

[0018]

According to the terminal structure of the present invention, the end of the braided wire inserted into the wire insertion hole is provided.
And a coating densely adhered to the outer coating covering the knitted wire in a watertight manner.
Having an attachment portion on the inner periphery and an inner surface of the wire insertion hole;
Alternatively, attach the case contact portion that tightly adheres to the
A substantially cylindrical waterproof grommet made of an insulating elastic material and having an inner cylindrical portion fitted between the insulating coating of the core wire and the braided wire.
The wire insertion hole
With a contact piece that is curved to protrude toward the inner peripheral surface of the
The outer cylinder to be pressed against the wire insertion hole of the metal case
Touching and covering the outer periphery of the tip of the waterproof grommet.
A shield connection ring made of a conductive material having a double crown structure, and an outer periphery of the waterproof grommet for fixing to a metal case.
And a grommet pressing means externally fitted to the portion .

Thus, the core wire covered with the insulation is first extended beyond the end of the braided wire for shield connection by a length necessary for the wiring in the metal case, and the grommet is fixed to the connection terminal. The holding means, the waterproof grommet, and the shield connection ring are externally fitted in this order. At this time, the waterproof grommet is attached to the shield braid so as to straddle the outer covering covering the braid and the end of the folded braid. Further, the shield connection ring is mounted so as to clamp the end of the braided wire whose inner tube portion and outer tube portion are folded back and the tip of the waterproof grommet.

Next, when the end of the assembled shield knitted wire is inserted into the wire insertion hole, the waterproof grommet interposed between the wire insertion hole and the shield knitted wire is inserted into the wire insertion hole and the shield knitted wire. To achieve a waterproof treatment. Also, a shield connection process in which the braided wire is electrically connected to the metal case is realized by the shield connection ring in which the inner tubular portion is pressed against the knitted wire and the outer tubular portion is pressed against the wire insertion hole. Then, an electrical connection between the core wire and the device-side connection terminal is realized by connecting the connection terminal such as a crimp terminal fixed to the core wire of the shield knitted wire to the device-side connection terminal.

Therefore, the waterproof grommet is fixed to the metal case by the grommet pressing means, whereby the shield connection ring and the waterproof grommet can be accurately and reliably positioned and fixed in the wire insertion hole. Therefore, the waterproofing process using the waterproof grommet and the shield connection process using the shield connection ring can be performed with high reliability and reliability.

Further, the waterproofing process and the shield connection process can be realized with a very small number of components such as a waterproof grommet, a shield connection ring, and a grommet pressing means. Moreover, the waterproof grommet can be formed by integral molding of synthetic rubber or the like, and the shield connection ring and grommet holding means can be easily formed by pressing a metal plate. Can be provided.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shield knitting terminal processing structure according to the present invention will be described with reference to FIGS. 1 is a sectional view showing an assembled state, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a plan view showing an assembled state, and FIG. 4 is a perspective view of a shield connection ring.

As shown in FIG. 1, in the terminal treatment structure of the shield knitted wire of the present embodiment, the core wire 41 of the shield knitted wire 40 is inserted into the metal case 42 from the electric wire insertion hole 43 provided in the metal case 42 of the electric equipment. It is inserted and connected to a device-side connection terminal (not shown) in the metal case 42. Further, the braided wire 45 of the shield braided wire 40 is electrically connected to the metal case 42, and the gap between the shield braided wire 40 and the wire insertion hole 43 is closed in a watertight manner.

That is, the core wire 41 of the shield braided wire 40 which is insulated is provided so as to extend from the end of the braided wire 45 for shield connection by a length necessary for routing in the metal case. A connection terminal 46 such as a crimp terminal required for connection with the device-side connection terminal is fixed to the distal end.

The end of the braided wire 45 of the shield braided wire 40 inserted into the electric wire insertion hole 43 and the outer covering 47 covering the braided wire 45 are covered with an insulating elastic material such as synthetic rubber. A waterproof grommet 5 integrally molded in a substantially cylindrical shape
3 is covered. At the inner peripheral portion of the waterproof grommet 53, coating contact portions 49 and 50 that are in close contact with the outer coating 47.
In addition, the outer peripheral portion has case contact portions 51 and 52 that are in close contact with the inner surface of the electric wire insertion hole 43 of the metal case 42 or the periphery thereof.

A shield connection ring 60 made of metal is mounted on the tip end of the waterproof grommet 53. The shield connection ring 60 is inserted between the insulating coating 55 of the core wire 41 and the knitted wire and covers the inner cylindrical portion 57 that makes electrical contact with the knitted wire 45 and the outer peripheral portion of the distal end of the waterproof grommet 53. It has a double crown structure having an outer cylindrical portion 58. The outer cylindrical portion 58 is provided with a contact piece 59 that presses against the metal case 42.

A grommet pressing means 61 for fixing the waterproof grommet 53 to the metal case 42 is provided on the waterproof grommet 53. The waterproof grommet 53 is a cylindrical body having a bellows portion formed at an intermediate portion, and a coating contact portion 49 formed at an inner peripheral portion of the waterproof grommet 53 has a number of ring-shaped protrusions closely contacting the outer coating 47 at a small interval. It has an arrayed configuration. Further, the coating contact portion 50 is formed by the outer coating 47.
A single ring-shaped protrusion is disposed in close contact with the substrate.
The case contact portion 51 protruding from the outer periphery of the waterproof grommet 53 is a ring-shaped projection that presses against the inner periphery of the wire insertion hole 43.
3 are flange-shaped protrusions that come into contact with the peripheral edge. The case contact portion 52 also functions as a step portion with which the grommet pressing means 61 is engaged.

The shield connection ring 60 is formed by pressing a thin metal plate having excellent spring characteristics. The contact piece 59 cuts and raises a part of the outer cylindrical portion 58 to form the inside of the wire insertion hole 43. A spring characteristic required as an electric contact piece is imparted by bending and molding so as to protrude toward the peripheral surface side.

As shown in FIG. 3, the grommet pressing means 6
Reference numeral 1 denotes a disk-shaped flange 66 fixed to the metal case 42 by bolts 65, and a step 67 formed on the inner peripheral side of the flange 66 so as to protrude into a dish-like shape and to receive and hold the case contact portion 52. With such a configuration, it is formed by pressing a metal plate or the like.

In the case of the above embodiment, the shielding braid 40
Is a state in which the core wire 41 coated in advance with insulation is extended from the end of the braided wire 45 for shield connection by a length necessary for routing in the metal case 42. Further, the grommet pressing means 61, the waterproof grommet 53, and the shield connection ring 60 are sequentially fitted to the outside, and a connection terminal 46 necessary for connection with the device-side connection terminal is fixed to the end of the core wire 41.

As shown in FIG. 1, a waterproof grommet 53 is provided.
Is mounted on the shield braided wire 40 so as to straddle the outer covering 47 covering the braided wire 45 and the end of the folded braided wire 45, and the shield connection ring 60 The end of the braided wire 45 folded back by the portion 58 and the waterproof grommet 5
3 is attached so as to sandwich the tip of the device.

When the end of the shield braided wire 40 assembled as described above is inserted into the wire insertion hole 43 provided in the metal case 42 of the electric device, the electric wire insertion hole 43 and the shield braided wire 40 are connected. Grommet 5 for waterproof interposed between
3 realizes a waterproof treatment between the electric wire insertion hole 43 and the shield braided wire 40. The shield connection ring 60 in which the inner cylindrical portion 57 is pressed against the knitted wire 45 and the outer cylindrical portion 58 is pressed against the wire insertion hole 43 realizes a shield connection process for electrically connecting the knitted wire 45 to the metal case 42. I do. And
The connection terminal 46 fixed to the core wire 41 of the shield braided wire 40 is connected to the device-side connection terminal, so that the core wire 41 is connected.
And the device-side connection terminal is electrically connected.

Further, by fixing the waterproof grommet 53 to the metal case 42 by the grommet pressing means 61, the shield connection ring 60 and the waterproof grommet 53 can be more accurately and reliably positioned and fixed in the wire insertion hole 43. Becomes Therefore, the waterproofing process by the waterproof grommet 53 and the shield connection process by the shield connection ring 60 are reliable and reliable.
Waterproofing and shield connection processing can be easily and reliably realized.

These waterproof processing and shield connection processing are as follows.
It can be realized with a very small number of parts such as the waterproof grommet 53, the shield connection ring 60, and the grommet pressing means 61. Moreover, the waterproof grommet 53 can be formed by integral molding of synthetic rubber or the like, and the shield connection ring 60 and the grommet pressing means 61 can be easily formed by pressing a metal plate or the like. Therefore, the connection between the shield braided wire 40 and the electric device can be realized at low cost.

[0036]

As described above, according to the structure for terminating the shielded braided wire of the present invention, the braid inserted into the wire insertion hole is provided.
Watertightly adheres to the end of the wire and the outer coating covering the knitted wire
The inner peripheral portion has a covering contact portion which is
Case contact area that is in water-tight contact with the inner surface of the hole or its periphery
A substantially cylindrical waterproof grommet made of an insulating elastic material having an outer peripheral portion, and an inner cylindrical portion having a core wire insulation coating and a knitted wire.
Fitted interpolated in addition to braided electrical contact between the conductive
The contact is curved and formed to protrude toward the inner peripheral side of the wire insertion hole.
The outer cylinder with the contact piece presses against the wire insertion hole of the metal case.
To make electrical contact with the outer periphery of the tip of the waterproof grommet.
A shield connection ring made of a conductive material having a double crown structure to be covered, and the waterproof grommet for fixing to a metal case.
And a grommet pressing means externally fitted to the outer peripheral portion of the grommet.

As a result, the shield connection ring and the waterproof grommet can be more accurately and reliably positioned and fixed in the wire insertion hole, and the waterproofing by the waterproof grommet and the shield connection by the shield connection ring can be performed reliably. It can be high and certain. Therefore, the waterproof treatment and shield connection processing of the shield braided wire,
It can be realized easily and reliably.

The waterproofing process and the shield connection process can be realized with a very small number of components such as a waterproof grommet, a shield connection ring, and a grommet pressing means. Therefore, the connection between the shield braided wire and the electric device can be realized easily and inexpensively.

[Brief description of the drawings]

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

FIG. 2 is a side view of FIG.

FIG. 3 is an exploded view of FIG.

FIG. 4 is a perspective view of a shield connection ring in FIG. 1;

FIG. 5 is a partial sectional view showing a conventional electric wire connection structure;
(A) is a connection structure of a covered electric wire, and (b) is a connection structure of a shield braid.

FIG. 6 is an exploded view showing a conventional shield knitting terminal processing structure.

FIG. 7 is an explanatory diagram showing an assembly completed state in FIG. 6;

FIG. 8 is an explanatory diagram showing a connection completed state in FIG. 6;

[Explanation of symbols]

 41 Core Wire 42 Metal Case 43 Electric Wire Insertion Hole 45 Braided Wire 47 External Cover 49,50 Coating Adhesive Part 51,52 Case Adhering Part 53 Waterproof Grommet 55 Insulating Coating 57 Inner Tube 58 Outer Tube 59 Contact Piece 60 Shield Connection Ring 61 Grommet holding means 65 Bolt 66 Flange 67 Step

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-6468 (JP, A) JP-A-4-220977 (JP, A) JP-A-5-122824 (JP, A) 12273 (JP, U) Real opening 63-127074 (JP, U) Real opening 56-2721 (JP, U) Real opening 58-20571 (JP, U) Real opening 64-36931 (JP, U) Japanese Utility Model 4-25417 (JP, U) Japanese Utility Model 4-33267 (JP, U) Japanese Utility Model 4-72818 (JP, U) Japanese Utility Model 5-91997 (JP, U) Japanese Utility Model 6-41075 (JP, U) Japanese Utility Model Application Hei 6-43467 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02G 15/00-15/196

Claims (1)

(57) [Claims] 1. A core wire of a shield braided wire is inserted through a wire insertion hole provided in a metal case of an electric device into a metal case and connected to a device-side connection terminal in the metal case. A terminal of a shield knitting wire for electrically connecting the knitting wire to the metal case and facilitating a device connection work of the shield knitting wire for closing a gap between the shield knitting wire and the electric wire insertion hole in a watertight manner. An end portion of the knitted wire inserted into the wire insertion hole and the knitting structure
Inner perimeter of the coating contact area that tightly adheres to the outer coating covering the wire
And the inner surface of the wire insertion hole or the
A substantially cylindrical waterproof grommet made of an insulating elastic material having a case contact portion on the outer periphery that is in close contact with the periphery in a watertight manner, and an inner cylinder portion is inserted between the insulating coating of the core wire and the knitted wire. While making electrical contact with the braided wire, the inner peripheral surface side of the wire insertion hole
An outer cylindrical portion having a contact piece curved and formed so as to protrude is brought into pressure contact with an electric wire insertion hole of a metal case to make electrical contact therewith, and
A shield connection ring made of a conductive material having a double crown structure that covers the outer periphery of the tip of the waterproof grommet, and is externally fitted to the outer periphery of the waterproof grommet to be fixed to a metal case.
And a grommet holding means.