JP2011103191A - Water cutoff structure of shield wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent water from infiltrating among strands from a drain wire of a shield wire to an extension line, and effect connection and waterproof treatment of the drain wire and the extension line in a compact way with the less number of components and less manhour. <P>SOLUTION: In a structure in which an end part 5a of the extension line 5 is connected to the drain wire 2 of the shield wire 1 through a terminal and the other end part of the extension line is arranged inside a waterproof connector 11, the terminal 12 is provided with a cylindrical part 13 for liquid-tightly inserting the one end part 5a of the extension line 5 and a sealing wall 14 forming a space for sealing in the one end part in the cylindrical part, with the one end part and the drain wire isolated with the sealing wall. For instance, a terminal part 6 of a drain wire side or the drain wire 2 is connected to a terminal part 16 protruded from the sealing wall 14 to a side opposite to the cylindrical part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a water stop structure for a shielded electric wire for stopping water between the strands of a drain wire for grounding a shielded electric wire that connects, for example, an engine room and a vehicle compartment side of an automobile.

  10 (a) and 10 (b) show one form of a conventional water stop structure for electric wires (see Patent Document 1).

  In this structure, as shown in FIG. 10A, a round plate terminal (LA terminal) 72 is connected to one end of an electric wire 71, a waterproof connector 73 is connected to the other end of the electric wire 71, and an intermediate portion of the electric wire 71 is cut off. The core wire portion 71a is exposed by peeling, and the branch wire 74 is jointly connected to the core wire portion 71a as shown in FIG. 10B, and a sealing agent 75 is filled around the core wire portion 71a and sealed with a waterproof film 76. It is a thing.

  The core wire portion 71a is composed of a plurality of strands. The sealant 75 waterproofs the strands, and water is prevented from being transmitted between the strands by a capillary phenomenon. The terminal 72 in FIG. 10A is non-waterproof, and is connected to a body panel or the like in an automobile engine room, and the waterproof connector 73 is disposed on the vehicle compartment side.

  For example, Patent Document 2 describes that a conductive adhesive is filled in a terminal into which a core wire portion of an electric wire is inserted, and Patent Document 3 describes a round plate terminal as a water-stop structure other than the above. It is described that a heat-shrinkable tube with an adhesive is placed on the outer periphery of the electric wire connecting portion (not shown).

  FIG. 11 shows one form of a water-stop structure for an existing shielded electric wire implemented by the present applicant.

  In this structure, an extension wire (general wire) 5 ′ is joint-connected to the grounding drain wire 2 of the shielded wire 1 through an abutting intermediate wire 77, and a connecting portion 78 between the drain wire 2 and the intermediate wire 77 is The connection portion 79 between the intermediate wire 77 and the extension wire 5 ′ is waterproofed with an adhesive for waterproofing between strands and a heat-shrinkable tube, and the terminal 9 on the distal end side of the extension wire 5 ′ and the shield wire 1 The terminal 19 on the main line 3 side is inserted into the waterproof connector 11 together with each waterproof rubber plug 10.

  By using the intermediate electric wire 77, the drain wire 2 and the extended electric wire 5 ′ are separated, and water transmitted between the strands of the drain wire 2 is prevented from entering between the individual wires of the extended electric wire 5 ′. The This prevents water from entering due to the breathing action between the wires due to changes in atmospheric pressure and temperature in the engine room.

Japanese Utility Model Publication No. 6-86221 (FIGS. 1 and 7) Japanese Patent Laying-Open No. 2004-200094 (FIG. 2) JP 2000-259883 A (FIG. 2)

  However, in the conventional water blocking structure of the shielded wire shown in FIG. 11, the intermediate wire 77, the joint terminal, the joint tape, the connection means such as heat welding, the adhesive, the heat shrinkable tube, and other parts and joints. There is a problem in that it requires a connection man-hour and a water stop man-hour, resulting in high costs. Moreover, in order to improve the waterproof workability with the extension wire, the intermediate wire 77 must be formed longer, the total length of the drain wire 2, the intermediate wire 77, and the extension wire 5 'increases, and the structure is enlarged. There was a problem of increasing the weight and weight.

  In view of the above points, the present invention can reliably prevent water from entering between the strands from the drain wire to the extension wire, as well as reducing the connection between the drain wire and the extension wire and waterproofing treatment. It aims at providing the waterproof structure of the shield electric wire which can be performed compactly by parts and man-hours.

  In order to achieve the above-mentioned object, a water stop structure for a shielded wire according to claim 1 of the present invention is such that one end of an extension wire is connected to the drain wire of the shield wire via a terminal, and the other end of the extension wire. In the structure in which the terminal is disposed in the waterproof connector, the terminal forms a cylindrical part for liquid-tightly inserting one end part of the extension wire, and a sealing wall that forms a space for confining the one end part in the cylindrical part The one end and the drain wire are isolated from each other through the sealing wall.

  With the above configuration, the water transmitted through the drain wire (for example, between the individual wires or between the braided wires) is blocked by the sealing wall of the terminal, and the water is prevented from propagating to one end of the extension wire. This prevents water from the drain wire from passing through the extension wire and entering the waterproof connector. At one end of the extension wire, for example, the outer peripheral surface of the insulating coating is elastically liquid-tightly contacted (adhered) to the inner peripheral surface of the cylindrical portion. Alternatively, the insulating coating and the cylindrical portion can be liquid-tight via a waterproofing means such as a sealing agent, an adhesive, or a rubber plug.

  The water stop structure for a shielded electric wire according to claim 2 is the water stop structure for the shielded electric wire according to claim 1, wherein a terminal portion protruding from the sealing wall to the side opposite to the tubular portion is provided on the drain wire side. A terminal portion or a drain wire is connected.

  With the above configuration, the drain wire side terminal portion (female terminal portion) is inserted and connected and locked to the terminal portion (for example, male terminal portion) protruding from the terminal sealing wall, or protruded from the terminal sealing wall. A drain wire (exposed core wire) is connected to a terminal portion (for example, the other cylindrical portion or the open barrel portion where the cylindrical portion is one side) by caulking or the like. Since the opening of the other cylindrical part is far away from the opening of the one cylindrical part, the creeping distance of the water along the cylindrical part increases, and even if the water along the drain line comes out of the other opening. No worries about reaching one of the openings.

  The waterproof structure of the shielded electric wire according to claim 3 is the waterproof structure of the shielded electric wire according to claim 1, wherein the sealing wall or the sealing rubber plug as the sealing wall is provided in the middle of the conductive pipe as the terminal. One end of the extension wire is inserted into one cylindrical portion of the conductive pipe, and the drain wire is inserted and connected to the other.

  With the above configuration, the conductive pipe is partitioned by an integral or separate sealing wall or a separate sealing rubber plug, and the water transmitted through the drain wire inserted into the other side of the conductive pipe and connected by caulking or the like is sealed. Water is blocked by a wall or a sealing rubber stopper, and the propagation of water to one end of the extension wire inserted into one of the conductive pipes is blocked by the sealing wall or the sealing rubber stopper. A sealing rubber stopper is also a kind of sealing wall. Since the opening of the other cylindrical portion of the conductive pipe is greatly separated from the opening of the one cylindrical portion, the creeping distance of the water along the cylindrical portion is increased, and the water transmitted through the drain wire is discharged to the outside from the other opening. Even so, there is no worry of reaching one of the openings.

  The water stop structure for a shielded wire according to claim 4 is the water stop structure for a shielded wire according to any one of claims 1 to 3, wherein the opening of the tubular portion and the outer peripheral surface of one end of the extension wire are It is characterized by being liquid-tightly sealed with a waterproofing means such as a sealing agent, an adhesive, or a waterproof rubber stopper.

  With the above configuration, in addition to the drain water between drain wires, the penetration of external water from the opening for inserting the extension wire into the cylindrical portion into the cylindrical portion is waterproof, such as a sealant, adhesive, waterproof rubber plug, etc. It is reliably prevented by means.

  According to the first aspect of the present invention, inter-element flooding from the drain wire to the extension wire can be reliably prevented by the sealing wall of the terminal, thereby improving the reliability of the electrical connection of the waterproof connector. be able to. In addition, since conventional intermediate wires and their joints are not required, connection between drain wires and extension wires and waterproofing can be performed at low cost with few parts and man-hours, and the total length of drain wires and extension wires The structure can be made compact by shortening the length.

  According to the second aspect of the invention, for example, the drain wire side terminal portion is inserted into the terminal portion of the terminal connected to the extension wire, and the connection is locked, thereby easily connecting the extension wire and the drain wire. be able to. Alternatively, by connecting the drain wire directly to the terminal portion of the terminal connected to the extension wire by caulking or the like, the terminal portion on the drain wire side is unnecessary, and the number of parts can be further reduced.

  According to the invention described in claim 3, by accommodating both the extension wire and the drain wire through the sealing wall or the sealing rubber plug in the conductive pipe, the water transmitted through the drain wire in the conductive pipe can be used. The creepage distance to the extension wire can be increased, and the propagation of water to the extension wire can be reliably prevented. Further, the terminal can be easily formed by using a separate sealing wall or sealing rubber plug.

  According to the invention described in claim 4, in addition to the inter-strand water stop of the drain wire, the entry of external water into the cylindrical portion from the opening for inserting the extension wire in the cylindrical portion is prevented with a sealing agent, an adhesive, It can be reliably prevented by waterproof means such as a waterproof rubber stopper.

It is a top view which shows 1st embodiment of the water stop structure of the shield electric wire which concerns on this invention. The connection structure of an extension electric wire and a terminal is similarly shown, (a) is a side view with a part in cross section, and (b) is a main part cross-sectional view. 2A and 2B show a second embodiment of a waterproof structure of a shielded wire, in which FIG. 4A is a cross-sectional view of a connection structure between an extension wire and a terminal, and FIGS. 5B and 5C are side views of the connection structure of a terminal and a drain wire. The example which used the other terminal in 2nd embodiment is shown, (a) is sectional drawing of the connection structure of an extension electric wire and a terminal, (b) (c) is a side view of the connection structure of a terminal and a drain wire. . 3A and 3B show a third embodiment of a waterproof structure of a shielded wire, (a) is a side view of the extension wire, (b) is a sectional view of the connection structure of the extension wire and the terminal, and (c) is a connection of the terminal and the drain wire. It is the side view which made a part of structure a section. 4A and 4B show a fourth embodiment of a waterproof structure for shielded wires, (a) is a side view of an extended wire, (b) and (c) are perspective views of a connection structure between the extended wire and a terminal, and (d) is a terminal and drain. It is a perspective view of the connection structure of a line. The example which used the other terminal in 4th embodiment is shown, (a) (b) is a perspective view of the connection structure of an extension electric wire and a terminal, (c) is a perspective view of the connection structure of a terminal and a drain wire. . The fifth embodiment of the waterproof structure of the shielded wire is shown, (a) is a side view of the extension wire, (b) is a perspective view of the connection structure of the extension wire and the terminal, (c) is a sectional view, (d) ) Is a perspective view of a connection structure between a terminal and a drain wire. It is a top view which shows collectively the completion state of the water stop structure of the shield electric wire of 2nd-5th embodiment. The one form of the conventional water stop structure of an electric wire is shown, (a) is a top view of an electric wire, and (b) is an important section sectional view of a water stop structure. It is a top view which shows one form of the conventional water stop structure of a shield electric wire.

  1 to 2 show a first embodiment of a waterproof structure for a shielded wire according to the present invention.

  In this structure, as shown in FIG. 1, a non-waterproof female terminal (terminal part) 6 is crimped and connected to the tip of the grounding drain wire 2 of the shielded wire 1, and an extension wire (general wire) as shown in FIG. 2) A terminal 9 for insertion into the waterproof connector 11 is connected to the core wire portion 7 on the distal end side of 5, and a waterproof rubber plug 10 is attached to the outer periphery of the insulating coating 8 of the extension wire 5, as shown in FIG. The insulation coating 8a on the proximal end side of the extension wire 5 is inserted into the bottomed tubular portion 13 of the closed barrel terminal (terminal) 12 and forward from the bottom sealing wall 14 in the tubular portion 13. The protruding needle pin 15 is inserted and connected to the core portion 7a on the proximal end side, and the male terminal portion (terminal portion) 16 protruding backward from the sealing wall 14 is inserted into the female terminal 6 and crimped as shown in FIG. (Crimping) Connect.

  The female terminal 6 is also referred to as a terminal lance (positive terminal), and is composed of an electrical contact portion 6a with a first half locking lance and a wire connecting portion 6b in the latter half, and the end of the drain wire 2 is inserted into the wire connecting portion 6b. The male terminal portion 16 of the terminal 12 on the extension wire 5 side is inserted and connected and locked in the electrical contact portion 6a. The drain wire 2 is composed of a plurality of strands 2a made of conductive metal. It is also possible to use a twisted conductive metal braided wire (not shown) as the drain wire 2.

  As shown in FIGS. 2 (a) and 2 (b), the closed barrel terminal 12 is also called a joint terminal, and is a conductive metal circular shape having a space 17 into which the base end portion 5a of the extension wire 5 is inserted from the opening 17a at the front end. The cylindrical portion 13, the bottom portion of the cylindrical portion 13, the circular sealing wall 14 that seals the proximal end portion 5 a of the extension wire 5 in the cylindrical portion 13, and the space 17 of the cylindrical portion 13 A sharp metallized pin 15 made of conductive metal protruding forward from the sealing wall 14 and a male terminal portion 16 having a constant diameter or a constant thickness protruding rearward from the sealing wall 14 are configured. It is also possible to replace the male terminal portion 16 with a female terminal portion and the female terminal 6 (FIG. 1) with a male terminal.

  In FIG. 2B, it is also possible to insert a base end portion 5 a of the extension wire 5 with a sealing agent (adhesive) (not shown) in the cylindrical portion 13. The cylindrical part 13 is crimped in a form such as hexagonal caulking with a pressing jig from above the base end part 5 a of the extension wire 5. In FIG. 1, in a state where the closed barrel terminal 12 and the female terminal 6 are connected, the insulating sheath 4 of the shielded electric wire 1, the main wire 3, the drain wire 2, the terminals 6, 12, and the extension wire 5 are connected with the insulating tape winding 18. Bundle and fix without looseness.

  As shown in FIG. 1, the proximal end of the extension wire 5 is located on the inner surface side of the sealing wall 14, and the distal end of the drain wire 2 is located on the outer surface side of the sealing wall 14. Since the end and the tip of the drain wire 2 are isolated from each other, the intrusion of water from the female terminal 6 side into the tubular portion 13 is prevented.

  In addition, the outer peripheral surface of the insulating coating 8a on the proximal end side of the extension wire 5 is elastically adhered to the inner peripheral surface of the cylindrical portion 13, and preferably the outer peripheral surface of the insulating coating 8a is the inner peripheral surface 13a of the cylindrical portion 13. By adhering to each other with a sealing agent or an adhesive, water can be prevented from entering the cylindrical portion 13 along the insulating coating 8.

  The terminal 9 on the distal end side of the extension wire 5 may be a male terminal or a female terminal (the terminal 9 is shown in a simplified manner in the figure), and is crimped to the extension wire 5 (in the case of pressure connection, the insulation coating 8 is provided). Skinning is not necessary). The waterproof rubber plug 10 includes an inner diameter portion (not shown) that is in close contact with the surface of the insulating coating 8 of the extension wire 5 and an inner surface of a terminal housing chamber (not shown) of an insulating resin connector housing (represented by reference numeral 11). And an outer diameter portion (lip) 10a that is in close contact with each other. The terminal 9 has, for example, a pair of left and right front core wire crimping pieces and a rear insulation coating crimping piece (not shown). The insulation coating crimping piece is fastened together with the insulating coating 8 at the tip of the waterproof rubber plug 10. Fix it. The terminal 19 on the front end side of the main electric wire 3 and the waterproof rubber plug 10 are the same (the main terminal 19 can be made larger than the ground terminal 9).

  Both terminals 9 and 19 are inserted into the terminal housing chambers of the connector housing 11 together with the waterproof rubber plugs 10 and locked by locking lances (not shown) in the terminal housing chamber, and at least the connector housing 11 and the terminals 9 and 9 19 and each waterproof rubber plug 10 constitute a waterproof connector. The shielded electric wire 1 includes a main electric wire 3 for energization, a drain wire 2 for grounding, and an insulating sheath 4 that covers both electric wires 2 and 3. When a braided wire is used as the drain wire 2, the braided wire covers the main electric wire 3, and the braided wire is covered by the insulating sheath 4.

  According to the embodiment of FIG. 1, the conventional intermediate wire is not required, so the total length (full length) of the drain wire 2 and the extension wire 5 is shortened. The connection (crimping) of the female terminal 6 to the drain wire 2 can be performed even if the drain wire 2 is short. Further, the proximal end portion 5a side of the extension wire 5 is not folded back as in the conventional case, and the distal end side of the flexible drain wire 2 having no insulation coating than the extension wire 5 may be folded back (the folded portion is indicated by reference numeral 2b). Good connection workability. If the extension wire 5 is formed shorter than the main wire 3, it is not necessary to fold the drain wire 2 into an S shape.

  The crimping of the closed barrel terminal 12 to the extension wire 5 and the crimping of the female terminal 6 to the drain wire 2 can be performed by an automatic machine, and the connection between the closed barrel terminal 12 and the female terminal 6 is also automated. Can be done. Moreover, when using an aluminum electric wire as the extension electric wire 5, moisture can be prevented in the closed barrel terminal 12, and the generation | occurrence | production of the oxide film of the base end part 5a of an aluminum electric wire can be prevented. These effects are also exhibited in each embodiment described later.

  3 and 4 show a second embodiment of the waterproof structure for shielded wires according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The extension wire 5, the terminal 9 at the tip thereof, and the waterproof rubber plug 10 are the same as those shown in FIG. In the first embodiment, the extension wire 5 and the drain wire 2 are connected using the closed barrel terminal 12 and the female terminal 6, but in this embodiment, only the closed barrel terminal (joint terminal) 20 is used for both. Connect wires 2 and 5.

  3A to 3C show an example in which a closed barrel terminal (terminal) 20 having closed barrel portions 21 and 22 integrally in front and rear is used. As shown in FIG. 3A, the closed barrel portion 21 on the front side includes a circular cylindrical portion 24 having an opening 23 a at the front end, a sealing wall (partition wall or partition wall) 25 on the bottom side, and a sealing wall 25. The rear closed barrel portion 22 is composed of a cylindrical portion (terminal portion) 26 and a common sealing wall 25 on the bottom side.

  As shown in FIG. 3B, the base end portion 5a of the extension wire 5 that is not peeled is inserted into the space 23 of the cylindrical portion 24 of the closed barrel portion 21 on the front side, and preferably the base end portion 5a is covered with insulation. A sealant (not shown) is loaded between 8a and the inner surface of the front cylindrical portion 24, the needle pin 15 is inserted into the core wire portion 7a and connected, and the front cylindrical portion 24 is tightened with hexagonal caulking or the like. It crimps with a jig | tool (a crimping part is shown with the code | symbol 27), and it fixes to the insulation coating 8a. Next, the drain wire 2 of the shielded electric wire 1 (FIG. 1) is inserted into the space 28 of the cylindrical portion 26 of the rear closed barrel portion 22, and the rear cylindrical portion 26 is pressed as shown in FIG. Crush it with a jig and fix it to the drain wire 2 by caulking.

  3, the base end of the extension wire 5 is located on one side of the sealing wall 25, the tip of the drain wire 2 is located on the other side of the sealing wall 25, and the base of the extension wire 5 is placed. Since the end and the tip of the drain wire 2 are isolated via the sealing wall 25, the water transmitted through the drain wire 2 is blocked by the sealing wall 25, and intrusion into the closed barrel portion 21 on the front side is prevented. Thus, the ingress of water into the extension wire 5 is prevented.

  In addition, the outer surface of the insulating coating 8 of the extension wire 5 and the inner surface of the front cylindrical portion 24 are in close contact with each other, and preferably sealed with a sealant or an adhesive, so that the opening 23a of the front cylindrical portion 24 is opened. Intrusion of water into the space 23 is prevented. As in the example of FIG. 1, the terminal 8 at the tip of the extension wire 5 and the waterproof rubber plug 10 (FIG. 1) are connected together with the terminal 19 at the tip of the main wire 3 of the shielded wire 1 and the waterproof rubber plug 10 in the waterproof connector 11. Inserted into.

  4A to 4C show an example in which a joint terminal (terminal) 29 integrally including a closed barrel portion 30 on the front side and an open barrel portion (terminal portion) 31 on the rear side is shown. As shown in FIG. 4A, the closed barrel portion 30 on the front side includes a circular cylindrical portion 33 having a front opening 32a, a bottom-side sealing wall (partition wall) 34, and a front side from the sealing wall 34. The rear opened barrel portion 31 is constituted by a protruding needle pin 15, and a substrate portion 35 following the sealing wall 34 and a pair of crimping pieces 36 protruding upward on the left and right sides of the substrate portion 35. Has been.

  As shown in FIG. 4B, the base end portion 5a of the extension wire 5 that is not peeled is inserted into the space 32 of the cylindrical portion 33 of the closed barrel portion 30 on the front side. A sealant or the like is loaded between 8a and the inner surface of the cylindrical portion 33, the needle pin 15 is stabbed into the core wire portion 7a and connected, and the cylindrical portion 33 is crimped with a jig such as hexagonal caulking (caulking). The fastening portion is fixed to the insulating coating 8a (indicated by reference numeral 37). Next, the drain wire 2 of the shielded electric wire 1 (FIG. 1) is inserted and set in the open barrel portion 31 on the rear side, and as shown in FIG. 4C, the pair of crimping pieces 36 are drained with a press jig (anvil and crimper). Crimp to 2 and fix.

  4, the proximal end of the extension wire 5 is located on the inner surface side of the sealing wall 34, the distal end of the drain wire 2 is located on the outer surface side of the sealing wall 34, and the proximal end of the extension wire 5 and the drain wire 2 is isolated through the sealing wall 34, the water transmitted through the drain wire 2 is blocked by the sealing wall 34, and the intrusion into the closed barrel portion 30 on the front side is prevented. 5 is prevented from entering water.

  Further, the outer surface of the insulating coating 8a of the extension wire 5 and the inner surface of the cylindrical portion 33 are in close contact with each other, and preferably sealed with a sealant or the like, so that water enters from the opening 32a of the closed barrel portion 30 on the front side. Is prevented. As in the example of FIG. 1, the terminal 9 on the distal end side of the extension wire 5 and the waterproof rubber plug 10 are inserted into the waterproof connector 11 together with the terminal 19 on the distal end side of the main wire 3 of the shielded wire 1 and the waterproof rubber plug 10. Is done.

  FIG. 5 shows a third embodiment of the waterproof structure for shielded wires according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The terminal 9 of the extension wire 5 and the waterproof rubber plug 10 are the same as those shown in FIG. In the first embodiment, the base end portion 5a of the extension wire 5 is connected to the closed barrel terminal 12 without peeling off, but in this embodiment, the base end portion 5a of the extension wire 5 is shown in FIG. The insulation coating 8a is peeled off to expose the core portion 7a and connect to the closed barrel terminal 39 in FIG.

  As shown in FIG. 5B, the closed barrel terminal (terminal) 39 includes a cylindrical section 41 with a bottom section having a circular shape in the first half having a space 40 into which the base end portion 5a of the extension wire 5 is inserted from the opening 40a at the front end. The bottom-side sealing wall 42 and a hollow-bottomed male terminal portion having a small-diameter hole 43 that protrudes rearward from the sealing wall 42 and penetrates the sealing wall 42 from the space 40 in the tubular portion 41 ( Terminal portion) 44. The tip 44a of the male terminal portion 44 is closed. The core wire portion 7 a of the extension wire 5 is inserted (accommodated) in the hole portion 43. The outer peripheral surface of the insulating coating 7a of the base end portion 5a of the extension wire 5 is bonded to the inner peripheral surface of the cylindrical portion 41 via a sealing agent 45 such as a self-bonding butyl sheet.

  As shown in FIG. 5 (c), the cylindrical portion 41 is crimped with a jig such as hexagonal caulking (the caulking portion is indicated by reference numeral 46a) and fixed to the insulating coating 8a, and the male terminal portion 44 is fixed to a small hexagon. It is crimped with a jig such as caulking (the caulking portion is indicated by reference numeral 46b) and connected and fixed to the core wire portion 7a. A female terminal (also referred to as a terminal lance or a positive terminal) 6 with a locking lance is crimped and connected to the drain wire 2 of the shielded electric wire 1. Next, the male terminal portion 44 is inserted and connected and locked to the female terminal 6.

  5, the base end of the extension wire 5 is located on the inner surface side of the sealing wall 42, the tip of the drain wire 2 is located on the outer surface side of the sealing wall 42, and the base end of the extension wire 5 and the drain wire 2 is isolated via the sealing wall 42, the water transmitted through the drain wire 2 is blocked by the bottomed male terminal portion 44 and the sealing wall 42, and enters the front tubular portion 41. Intrusion is prevented and water intrusion into the extension wire 5 is prevented.

  Further, the outer surface of the insulating coating 8a and the inner surface of the cylindrical portion 41 are in close contact with each other, and preferably sealed with a sealing agent 45 such as a butyl sheet, so that water from the front opening 40a of the cylindrical portion 41 is sealed. Intrusion is prevented. As in the example of FIG. 1, the terminal 9 on the tip side of the extension wire 5 and the waterproof rubber plug 10 are inserted into the waterproof connector together with the terminal 19 on the tip side of the main wire 3 of the shielded wire 1 and the waterproof rubber plug 10. The

  6 and 7 show a fourth embodiment of the waterproof structure for shielded wires according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the present embodiment, the drain wire 2 and the extension wire 5 are connected by using a metal conductive pipe (terminal) 48 having a sealed middle portion as a closed barrel terminal without using the female terminal 6 of FIG. is doing. As shown in FIG. 6 (a), the extension wire 5, its terminal 9, and the waterproof rubber plug 10 on the tip side are the same as those in FIG. 5 (a), and the extension wire 5 is peeled off to expose the core portion 7a. A similar waterproof rubber plug 49 is attached to the proximal end portion 5a in the reverse direction. The extension wire 5 shown in FIG. 6A is used in the same manner in the example shown in FIG.

  In the examples of FIGS. 6A to 6D, as closed barrel terminals, conductive pipes made of aluminum or copper each having a large-diameter cylindrical portion 50 in the first half and a small-diameter cylindrical portion (terminal portion) 51 in the second half ( Terminal) 48 is used to connect extension wire 5 and drain wire 2 of shielded wire 1. As shown in FIG. 6B, the through hole 53 of the small-diameter cylindrical portion 51 in the latter half is sealed at the intermediate portion with a sealing rubber plug 52 or a sealing wall made of metal or the like. The sealing rubber plug 52 and the sealing wall are preferably press-fitted into the hole 53 of the small-diameter cylindrical portion 51. The sealing wall (52) may be formed integrally with the small diameter cylindrical portion 51. The sealing rubber stopper 52 is a kind of sealing wall.

  As shown in FIG. 6C, the base end portion 5 a of the extension wire 5 is inserted into the internal space 54 from the opening 54 a at the front end of the large-diameter cylindrical portion 50, and the exposed core portion 7 a is the small-diameter cylindrical portion 51. The insulating cover 8a and the waterproof rubber plug 49 are housed in the large-diameter cylindrical portion 50, and the outer peripheral lip 49a of the waterproof rubber plug 49 is formed on the inner peripheral surface of the large-diameter cylindrical portion 50. By adhering, the front opening 54a of the large-diameter cylindrical portion 50 is liquid-tightly sealed, and the small-diameter cylindrical portion 51 is caulked with a jig such as hexagonal caulking from above the core wire portion 7a ( The caulking portion is indicated by reference numeral 55 a), and the core wire portion 7 a is connected and fixed to the small-diameter cylindrical portion 51.

  The drain wire 2 is inserted into the hole portion 53 in the first half of the small diameter cylindrical portion 51 as shown in FIG. 6 (d), and the small diameter cylindrical portion 51 is joined from above the drain wire 2 with a jig such as hexagonal caulking. By tightening (a caulking portion is indicated by reference numeral 55b), the drain wire 2 is connected and fixed to the cylindrical portion 51 having a small diameter. The sealing rubber plug 52 or the sealing wall is located between the front and rear caulking portions 55a and 55b.

  6, the base end of the extension wire 5 is positioned on one surface side of the sealing rubber plug 52 or the sealing wall, and the distal end of the drain wire 2 is the other surface of the sealing rubber plug 52 or the sealing wall. Since the proximal end of the extension wire 5 and the distal end of the drain wire 2 are separated from each other via the sealing rubber plug 52 or the sealing wall, the water transmitted through the drain wire 2 is sealed with the sealing rubber plug 52 or It is blocked by the sealing wall, preventing entry into the large-diameter cylindrical portion 50 on the front side, and preventing entry of water into the extension wire 5.

  Further, the outer surface of the insulating coating 8a and the inner surface of the large-diameter cylindrical portion 50 are in close contact with each other via the waterproof rubber plug 49, thereby preventing water from entering from the front opening 54a of the large-diameter cylindrical portion 50. Is done. As in the example of FIG. 1, the terminal 9 on the tip side of the extension wire 5 and the waterproof rubber plug 10 are inserted into the waterproof connector together with the terminal 19 on the tip side of the main wire 3 of the shielded wire 1 and the waterproof rubber plug 10. The

  In the example of FIGS. 7A to 7C, as shown in FIG. 7A, a conductive pipe (terminal) 57 having a uniform cross section made of aluminum or copper is used as a closed barrel terminal. A sealing rubber wire 52 or a sealing wall is provided in the middle of the through-hole 58, and a cylindrical cover (cylindrical portion) 61 having a circular cross section made of synthetic resin is provided on the outer surface of the front end of the cylindrical portion 59 of the first half of the conductive pipe 57. 7B, a waterproof rubber stopper 49 of the extension wire 5 is attached in the cylindrical cover 61 as shown in FIG. 7B, and the space of the cylindrical portion 59 on the front side of the conductive pipe 57 as shown in FIG. The drain wire 2 is inserted into the space 58 of the exposed core wire portion 7a of the base end portion 5a of the extension wire 5 and the rear cylindrical portion (terminal portion) 60 in the 58a, and is connected by crimping.

  The cylindrical cover 61 is press-fitted into the outer surface side of the first half cylindrical portion 59 using, for example, a flexible resin material such as PVC, or is fixed using an adhesive or the like. The cylindrical cover 61 becomes a part of the cylindrical portion 59 in the first half. As shown in FIG. 7A, the front part of the conductive pipe 57 is press-fitted into the hole (space) 62 through which the cylindrical cover 61 passes, and is preferably fixed with an adhesive or the like.

  As shown in FIG. 7B, the insulation covering portion 8a of the extension wire 5 is inserted into the cylindrical portion 59 of the first half of the conductive pipe 57 together with the core wire portion 7a, and the waterproof rubber plug 49 is press-fitted into the cylindrical cover 61. It adheres to the inner surface of the cylindrical cover and prevents water from entering through the front end opening of the conductive pipe 57.

  The cylindrical portion 59 of the first half is crimped from above the core wire portion 7a with a jig such as hexagonal caulking (the crimped portion is indicated by reference numeral 63a), and the core wire portion 7a and the cylindrical portion 59 of the first half are connected and fixed. As shown in FIG. 7C, the drain wire 2 is inserted into the cylindrical portion 60 in the latter half of the conductive pipe 57, and the cylindrical portion 60 in the latter half is joined from above the drain wire 2 with a jig such as hexagonal caulking. The drain wire 2 and the cylindrical portion 60 in the latter half are connected and fixed by being tightened (a caulking portion is denoted by reference numeral 63b). The sealing rubber plug 52 or the sealing wall is held between the front and rear caulking portions 63a and 63b. The sealing rubber stopper 52 is a kind of sealing wall.

  7, the base end of the extension wire 5 is positioned on one surface side of the sealing rubber plug 52 or the sealing wall, and the distal end of the drain wire 2 is the sealing rubber plug 52 or the other surface of the sealing wall. Since the proximal end of the extension wire 5 and the distal end of the drain wire 2 are separated from each other via the sealing rubber plug 52 or the sealing wall, the water transmitted through the drain wire 2 is sealed with the sealing rubber plug 52 or It is blocked by the sealing wall, and the intrusion into the cylindrical portion 59 in the first half of the conductive pipe 57 is prevented, and the ingress of water into the extension wire 5 is prevented.

  Further, the outer surface of the insulating coating 8a and the inner surface of the cylindrical cover 61 are in close contact with each other through the waterproof rubber plug 49, and the inner surface of the cylindrical cover 61 and the outer surface of the cylindrical portion 59 in the first half of the conductive pipe 57 are in close contact with each other. This prevents water from entering the conductive pipe 57 from the front opening 62 a of the cylindrical cover 61. As in the example of FIG. 1, the terminal 9 on the distal end side of the extension wire 5 and the waterproof rubber plug 10 are inserted into the waterproof connector together with the terminal 19 on the distal end side of the main wire 2 of the shielded wire 1 and the waterproof rubber plug 10. The

  FIG. 8 shows a fifth embodiment of the waterproof structure for shielded wires according to the present invention. The same components as those in the first and fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, instead of the cylindrical cover 61 and the waterproof rubber plug 49 of FIG. 7, a waterproof rubber plug (waterproof seal member) 66 having a circular cross section is used, and a conductive pipe 57 is inserted into the waterproof rubber plug 66. Infiltration from the front opening 58b of the conductive pipe 57 is prevented, and the transmission of water from the drain wire 2 is prevented by the sealing rubber plug 52 or the sealing wall in the conductive pipe 57 as in FIG. The sealing rubber stopper 52 is a kind of sealing wall.

  As shown in FIG. 8A, a waterproof rubber plug 66 is attached to the outer periphery of the insulating coating 8 a on the proximal end side of the extension wire 5. As shown in FIG. 8B, the waterproof rubber plug 66 has a first-half small-diameter hole 67a through which the extension wire 5 is inserted and a second-half large-diameter hole 67b following the hole 67a. As shown in FIG. 8C, the front portion of the tubular portion 59 of the front half of the aluminum or copper conductive pipe (terminal) 57 is inserted into the large-diameter hole 67b, and the inner lip of the large-diameter hole 67b is inserted. The front outer peripheral surface of the first-half tubular portion 59 is in close contact, and the outer peripheral surface of the insulating coating 8 of the extension wire 5 is in close contact with the inner peripheral lip of the first half hole 67a.

  As shown in FIG. 8C, the core wire portion 7a of the base end portion 5a of the extension wire 5 and the insulating coating 8a are inserted into the space 58a of the cylindrical portion 59 of the first half of the conductive pipe 57 from the front opening 58b. Each of them is crimped with a jig such as hexagonal crimping (the crimped portions are indicated by reference numerals 63a and 63c) and fixed. A sealing rubber stopper 52 or a separate sealing wall is disposed in the middle in the longitudinal direction of the conductive pipe 57.

  As shown in FIG. 8 (d), the drain wire 2 is inserted into the cylindrical portion 60 in the latter half of the conductive pipe 57 from the rear opening and crimped in the radial direction from the outside (the crimped portion is indicated by reference numeral 63b). Fixed. The sealing rubber plug 52 or the sealing wall is held between the front and rear caulking portions 63a and 63b. The same applies to the example of FIG. 7, but the sealing rubber plug 52 or the sealing wall can be prevented from being pulled back by another caulking portion (not shown) adjacent to the rear.

  8, the base end of the extension wire 5 is located on one surface side of the sealing rubber plug 52 or the sealing wall, and the distal end of the drain wire 2 is the other surface of the sealing rubber plug 52 or the sealing wall. Since the proximal end of the extension wire 5 and the distal end of the drain wire 2 are separated from each other via the sealing rubber plug 52 or the sealing wall, the water transmitted through the drain wire 2 is sealed with the sealing rubber plug 52 or It is blocked by the sealing wall, and the intrusion into the cylindrical portion 59 in the first half of the conductive pipe 57 is prevented, and the ingress of water into the extension wire 5 is prevented.

  Further, since the fitting portion between the extension wire 5 and the conductive pipe 57 is covered with the waterproof rubber plug 66, the intrusion of water from the front opening 58 b of the conductive pipe 57 is prevented. As in the example of FIG. 1, the terminal 9 on the tip side of the extension wire 5 and the waterproof rubber plug 10 are inserted into the waterproof connector together with the terminal 19 on the tip side of the main wire 3 of the shielded wire 1 and the waterproof rubber plug 10. The

  FIG. 9 illustrates the completed state of the water stop structure of the shielded electric wire according to each of the embodiments shown in FIGS. 3 to 8 described above. The large-diameter cylindrical portion indicated by the symbol A in FIG. 4 of the first half of the closed barrel terminal 20, the cylindrical portion 33 of the joint terminal 29 of FIG. 4, the cylindrical portion 41 of the closed barrel terminal 39 of FIG. 5, and the first half of the conductive pipe 48 of FIG. The cylindrical portion 50, the cylindrical cover 61 shown in FIG. 7, and the waterproof rubber plug 66 shown in FIG. 8 respectively correspond to the small-diameter cylindrical portion indicated by B in FIG. 9, and the latter half of the closed barrel terminal 20 shown in FIG. 4, the open barrel portion 31 in the latter half of the joint terminal 29 in FIG. 4, the female terminal 6 in FIG. 5, the cylindrical portion 51 in the latter half of the conductive pipe 48 in FIG. 7 corresponds to the latter half of the conductive pipe 57 and the latter half of the conductive pipe 57 of FIG.

  As in the embodiment of FIG. 1, the insulating sheath 4, the main wire 3, the drain wire 2, the extension wire 5, and the connection portion between the two wires 2, 5 of the shielded wire 1 are fixed to each other without play by the insulating tape winding 18. . Reference numeral 11 denotes a waterproof connector.

  The water stop structure for a shielded wire according to the present invention is used to prevent water from entering a waterproof connector from a drain wire for shield ground in a wire harness that connects, for example, an engine room and a vehicle compartment side of an automobile. be able to.

DESCRIPTION OF SYMBOLS 1 Shield electric wire 2 Drain wire 5 Extension electric wire 5a One end part 6 Terminal part 11 Waterproof connector 12, 20, 29, 39 Terminal 13, 24, 33, 41, 50, 59 Cylindrical part 14, 25, 34, 42 Sealing wall 16, 26, 31, 44 Terminal portion 17, 23, 32, 40, 54, 62, 58 Space 17a, 23a, 32a, 40a, 54a, 62a, 58b Opening 45 Sealant 48, 57 Conductive pipe (terminal)
49,66 Waterproof rubber stopper 52 Sealing rubber stopper (sealing wall)
61 Cylindrical cover (cylindrical part)

Claims (4)

  In the structure in which one end of the extension wire is connected to the drain wire of the shielded wire via the terminal, and the other end of the extension wire is disposed in the waterproof connector, the terminal is liquid-tightened to the one end of the extension wire. A cylindrical portion for insertion and a sealing wall that forms a space for confining the one end portion in the cylindrical portion, and the one end portion and the drain wire are isolated via the sealing wall. Shielded water structure for shielded wires.   The water stop structure for a shielded electric wire according to claim 1, wherein a terminal portion or a drain wire on the drain wire side is connected to a terminal portion that protrudes from the sealing wall to the side opposite to the cylindrical portion.   A sealing rubber plug as the sealing wall or a sealing wall is provided in the middle of the conductive pipe as the terminal, one end portion of the extension wire is provided on one cylindrical portion of the conductive pipe, and the drain wire is provided on the other side. The water stop structure for a shielded electric wire according to claim 1, wherein each is inserted and connected.   The opening of the said cylindrical part and the outer peripheral surface of the one end part of the said extension electric wire were liquid-tightly sealed with waterproofing means, such as a sealing agent, an adhesive agent, and a waterproof rubber plug. The water stop structure of the shielded electric wire according to any one of the above.

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