JP4460263B2 - Waterproof cable manufacturing method and waterproof cable - Google Patents

Description

  The present invention further includes an insulating layer that further covers the covered electric wire, prevents liquid from entering between the insulating layer and the covered electric wire from the end portion of the insulating layer, and leaks between the insulating layer and the covered electric wire. It is related with the waterproof cable which prevents that the liquid leaks outside.

  For example, an automobile as a moving body is equipped with various electronic devices such as lamps and motors. For this reason, the automobile mentioned above has wired the wire harness in order to supply electric power and a signal to an electronic device. The wire harness includes a plurality of covered electric wires and connectors. The covered electric wire includes a conductive core wire and an insulating covering portion that covers the core wire. The connector includes a terminal fitting made of conductive sheet metal and a connector housing made of an insulating synthetic resin that accommodates the terminal fitting. The above-described wire harness is routed to an automobile, for example, by fitting the connector to the connector of the above-described electronic device, and supplies desired electric power and signals to each electronic device.

  As the above-described covered electric wire, a shielded electric wire is sometimes used mainly to prevent electrical noise from the outside from entering the core wire. The shielded electric wire includes a braid wound around the outer periphery of the covering portion serving as a shield layer in addition to the core wire and the covering portion described above, and an insulating layer covering the braid. The braid is composed of a plurality of strands made of conductive metal. The insulating layer is made of an insulating synthetic resin or the like. With this type of shielded wire, the braid prevents electrical noise from entering the core wire from the outside.

  In addition, the above-described shielded electric wire has one end arranged in a space in which liquid such as water enters from the outside such as the above-described automobile engine room, and the other end connected to an ECU (Electronic Control Unit) as an electronic device. There is. In this case, a liquid such as water may enter from the one end side described above between the insulating layer of the shielded wire and the covering portion.

  For this reason, in order to prevent liquid such as water that has entered between the insulating layer and the covering portion from the other end of the shielded wire from entering the ECU, various waterproof structures (that is, waterproof cables) have been conventionally used. For example, Patent Document 1) is used.

In the waterproof structure rule or waterproof cable described in Patent Document 1, the terminal of the insulating layer, the covered electric wire exposed from the terminal, and the shield layer are molded with resin. By doing so, the waterproof cable described above prevents liquid such as water that has entered between the insulating layer and the covered electric wire from leaking out from the other end and entering the ECU. . Of course, as described above, a terminal fitting is attached to the end of the covered electric wire molded with resin in order to connect the ECU and the covered electric wire.
JP 2002-42917 A

  In the waterproof cable shown in Patent Document 1 described above, after attaching the terminal metal fitting to the terminal of the covered wire, the terminal of the insulating layer, the covered wire exposed from the terminal, and the shield layer must be molded with resin. There wasn't. For this reason, after attaching a terminal metal fitting to the terminal of the above-mentioned covered electric wire, the part to be molded with resin is positioned between the molds for resin molding and molded.

  For this reason, the man-hour concerning the operation | work which positions the covered electric wire etc. which attached the terminal metal fitting once again between the molds which carry out resin molding tends to increase. Moreover, since the processing apparatus for attaching the terminal fitting to the covered electric wire and the processing apparatus for performing the resin molding described above are separate bodies, a series of molding with resin after attaching the terminal fitting to the covered electric wire. It was difficult to automate the work. For this reason, the efficiency of the above-described waterproof cable assembly work is low, and the time required for the assembly tends to be prolonged.

  Accordingly, it is an object of the present invention to provide a waterproof cable assembling method and a waterproof cable that can improve the efficiency of assembling work and can reduce the time and man-hour required for assembling.

In order to solve the above problems and achieve the object, the waterproof cable manufacturing method of the present invention according to claim 1 comprises a covered electric wire and a synthetic resin, further covering the covered electric wire and at the end of the covered electric wire. An insulating layer that exposes the liquid, and prevents liquid from entering between the insulating layer and the covered electric wire from the end portion of the insulating layer, and the liquid leaking from the end portion of the insulating layer is externally In the method of manufacturing a waterproof cable for preventing leakage, a terminal portion of the insulating layer and a covered electric wire exposed from the terminal portion of the insulating layer are passed through a waterproof tube made of synthetic resin, and one end portion of the waterproof tube By sandwiching a terminal portion of the insulating layer in the one end portion between a pair of electrodes to which a high-frequency voltage is applied, pressurizing the pair of electrodes in a direction approaching each other, and applying a high-frequency voltage between the pair of electrodes Wherein a terminal portion of the one end portion of the waterproof tube the insulating layer and welded to each other, and, and said covered wire on the other end and the other end portion of the waterproof tube between a pair of electrodes a high frequency voltage is applied By sandwiching and pressing the pair of electrodes in a direction approaching each other and applying a high frequency voltage between the pair of electrodes, the other end portion of the waterproof tube and the covering portion of the covered electric wire are welded to each other , and The pair of electrodes are attached with a pair of holding members made of an insulator that positions the waterproof tube between each other when the waterproof tube is sandwiched between the pair of electrodes. The electrodes are spaced apart from each other along a direction intersecting with each other, and the waterproof tube melted by application of the high-frequency voltage is protruded from between the pair of electrodes. It is characterized in that to prevent.

A waterproof cable manufacturing method according to a second aspect of the present invention is the waterproof cable manufacturing method according to the first aspect , wherein the waterproof cable is housed in the insulating layer and covers the covered electric wire and is made of a conductor. A shield layer; a drain wire housed in the insulating layer and electrically connected to the shield layer; and a second covered electric wire electrically connected to the drain wire; When welding the end portion and the covering portion of the covered electric wire to each other, sandwiching the second covered electric wire between a pair of electrodes, the other end portion of the waterproof tube and the covering portion of the second covered electric wire, Are further welded together.

The waterproof cable of the present invention according to claim 3 includes a covered electric wire and an insulating layer made of a synthetic resin and further covering the covered electric wire and exposing a terminal portion of the covered electric wire. A waterproof cable that prevents liquid from entering between the insulating layer and the covered electric wire from the terminal portion and prevents liquid leaking from the terminal portion of the insulating layer from leaking to the outside. And a waterproof tube through which a terminal portion of the insulating layer and a covered electric wire exposed from the terminal portion of the insulating layer are passed , a shield layer which is accommodated in the insulating layer and covers the covered electric wire and is made of a conductor, and the insulation comprising a drain line connected accommodated and to the shielding layer and the electrically to the layer, and the second covered wires connected the the drain line electrically, the one end portion and said one end of the waterproof tube By sandwiching the terminal portion of the insulating layer in between a pair of electrodes to which a high frequency voltage is applied, pressurizing the pair of electrodes in a direction approaching each other, and applying a high frequency voltage between the pair of electrodes, One end of the waterproof tube and the end portion of the insulating layer are welded to each other , and the other end of the waterproof tube and the covered electric wire in the other end are connected between a pair of electrodes The other end portion of the waterproof tube and the covering portion of the covered electric wire are welded to each other by applying a high frequency voltage between the pair of electrodes by pressurizing the pair of electrodes in a direction approaching each other. In addition, the covering portion of the second covered electric wire and the other end portion of the waterproof tube are sandwiched between the pair of electrodes, and a high frequency voltage is applied to the pair of electrodes to be welded to each other. and features that you are There.

  According to the method for manufacturing a waterproof cable of the present invention described in claim 1, the insulating wire and the covered electric wire exposed from the terminal portion of the insulating layer are passed through the waterproof tube, and the waterproof tube is applied between the electrodes to which the high frequency voltage is applied. The insulating layer and the waterproof tube are welded to each other by sandwiching them, and the covered electric wire and the waterproof tube are welded. In this way, the insulating layer and the waterproof tube are welded by so-called high frequency welding, and the liquid leaked from between the insulating layer and the covered wire is welded into the waterproof tube by welding the coated electric wire and the waterproof tube. Can be confined.

Such waterproof tube that a pair of holding members is melted from between the electrodes can be prevented from protruding from between the electrodes. For this reason, a waterproof tube and an insulating layer can be reliably high-frequency welded, and the space between them can be reliably kept watertight. In addition, the waterproof tube and the covered portion of the covered electric wire can be reliably welded with high frequency, and the space between them can be reliably kept watertight.

According to the waterproof cable manufacturing method of the present invention described in claim 2 , the second covered electric wire connected to the drain wire and the waterproof tube are welded by so-called high frequency welding. For this reason, between the 2nd covered electric wire and a waterproof tube can be reliably kept watertight.

According to the waterproof cable of the present invention described in claim 3 , the insulating layer and the waterproof tube are welded by so-called high-frequency welding, and the covered electric wire and the waterproof tube are welded. For this reason, the liquid leaking from between the insulating layer and the covered electric wire can be reliably confined in the waterproof tube. Thus, it is assembled by welding an insulating layer, each covered electric wire, and a waterproof tube by high frequency welding.

A second covered wires connected with drain lines and waterproof tube is welded by a so-called high-frequency welding. For this reason, between the 2nd covered electric wire and a waterproof tube can be reliably kept watertight.

  As described above, the present invention according to claim 1 welds the insulating layer and the waterproof tube and waterproofs the coated electric wire and the waterproof wire by high-frequency welding capable of welding the welding objects by applying a high-frequency voltage for a short time. The waterproof cable can be assembled by welding the tube. For this reason, the assembly work of a waterproof cable can be performed easily. Therefore, the efficiency of the assembling work of the waterproof cable can be improved, and the required time and man-hours for assembling can be suppressed.

  Moreover, since each of the insulating layer and the covered electric wire and the waterproof tube are heated from the inside by high frequency heating, they can be heated uniformly and welded together. Moreover, since the insulating layer and each of the covered electric wires and the waterproof tube are heated from the inside by high-frequency heating, it is possible to prevent the insulating layer and the covered electric wires other than the portion sandwiched between the electrodes and the waterproof tube from being heated. Damage can be reliably prevented.

A waterproof tube and between the insulating layer can be maintained between the covering portion of the waterproof tube covered wire to reliably watertight. For this reason, the liquid leaking from between the insulating layer and the covered electric wire can be confined in the waterproof tube. Therefore, it is possible to reliably prevent the liquid leaking from between the insulating layer and the covered electric wire from leaking outside the waterproof cable. Of course, liquid such as water can be prevented from entering between the insulating layer and the covered electric wire from the end portion of the insulating layer.

According to the second aspect of the present invention, the space between the second covered electric wire connected to the drain wire and the waterproof tube can be reliably kept watertight. For this reason, the liquid leaking from between the insulating layer and the covered electric wire can be reliably prevented from leaking outside the waterproof cable through the gap between the second covered electric wire and the waterproof tube. It is possible to prevent liquid such as water from entering the waterproof tube through between the electric wire and the waterproof tube.

The present invention according to claim 3 is to weld the insulating layer and the waterproof tube and weld the covered electric wire and the waterproof tube by high frequency welding for welding the welding objects to be applied with a high frequency voltage for a short time, Assembled. For this reason, assembly work can be easily performed. Therefore, it is possible to improve the efficiency of the assembly work, and it is possible to reduce the time and man-hours required for assembly.

Between the second covered wires connected with drain lines and the waterproof tube she can be kept reliably watertight. For this reason, the liquid leaking from between the insulating layer and the covered electric wire can be reliably prevented from leaking outside the waterproof cable through the gap between the second covered electric wire and the waterproof tube. It is possible to prevent liquid such as water from entering the waterproof tube through between the electric wire and the waterproof tube.

  Hereinafter, a waterproof cable and a method of manufacturing the waterproof cable according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the waterproof cable 1 shown in FIG. 2 or the like constitutes a wire harness 9 that is routed in an automobile with connectors 8 attached to both ends. One end of the wire harness 9 is positioned in a space 20 into which a liquid such as water can enter from the outside such as an engine room. For this reason, one terminal part 2b of the below-mentioned covered electric wire 2 of the waterproof cable 1 is arranged in the space 20 mentioned above.

  The connector 8 of the wire harness 9 includes a terminal fitting (not shown) made of a conductive sheet metal and a connector housing 21 made of an insulating synthetic resin. One connector 8 is connected to an electronic device arranged in the above-described space 20 such as an engine room, and the other connector 8 is connected to an ECU (Electronic Control Unit) 22 as an electronic device.

  As shown in FIGS. 1 and 2, the waterproof cable 1 includes a plurality of covered electric wires 2, one drain wire 3, a conductor sheet 4 (shown in FIG. 3) as a shield layer, and a sheath as an insulating layer. 5, a second covered electric wire 23, and a waterproof tube 24.

  The covered electric wires 2 are arranged in parallel to each other. In the illustrated example, three covered electric wires 2 are provided. As shown in FIGS. 3 and 4, the covered electric wire 2 includes a core wire 6 and a covering portion 7. The core wire 6 is formed by twisting a plurality of strands. The strand is made of a conductive metal. For this reason, the core wire 6 consists of an electroconductive metal. The core wire 6 has a round cross section. Moreover, the core wire 6 may be comprised from one strand. The covering portion 7 is formed in a circular tube shape, is made of an insulating synthetic resin, and covers (accommodates) the core wire 6. The covered electric wire 2 includes the core wire 6 and the covering portion 7 described above, and is formed in a round cross section. The covered electric wire 2 has flexibility.

  Furthermore, the above-described connector 8 is attached to one end portion 2b of the covered electric wire 2, and is arranged in the above-described space such as the engine room. The connector 8 connected to the ECU 22 described above is attached to the other terminal portion 2a of the covered electric wire 2.

  The drain wire 3 is arranged in parallel with the plurality of covered electric wires 2. The drain wire 3 is formed by twisting a plurality of strands. The strand is made of a conductive metal. Therefore, the drain line 3 is made of a conductive metal. The drain line 3 has a round cross section. Moreover, the drain line 3 may be comprised from one strand.

  The conductor sheet 4 is made of a conductive metal such as aluminum or an aluminum alloy, and is formed in a sheet shape. The conductor sheet 4 has flexibility. The conductor sheet 4 is wound around the outer periphery of the above-described covered electric wire 2 and drain wire 3 to cover (cover) them. The conductor sheet 4 is electrically and mechanically connected to the drain wire 3. The conductor sheet 4 prevents electrical noise from entering the core wire 6 of the covered electric wire 2 from the outside, and prevents electrical noise from being released from the core wire 6 of the covered electric wire 2 to the outside. The electrical noise described above is led to a ground circuit (not shown) to be described later via the drain line 3.

  The sheath 5 is made of an insulating synthetic resin or the like and is formed in a circular pipe (pipe) shape. The sheath 5 has flexibility. As shown in FIG. 3, the sheath 5 accommodates the plurality of covered electric wires 2 and drain wires 3 for each conductor sheet 4 described above. For this reason, the sheath 5 covers (covers) the covered electric wire 2. Further, the sheath 5 accommodates the above-described center portion in the longitudinal direction of the covered electric wire 2 and the drain wire 3, and exposes both end portions 2a, 2b of the covered electric wire 2 and the end portion 3a of the drain wire 3. Yes.

  Since the second covered electric wire 23 (shown in FIG. 4 and the like) has the same configuration as the above-described covered electric wire 2, the same parts as those of the covered electric wire 2 are denoted by the same reference numerals and description thereof is omitted. The core wire 6 of the second covered electric wire 23 is electrically and mechanically connected to the terminal portion 3a of the drain wire 3 by a joint terminal 25 (shown in FIGS. 1 and 2). The second covered electric wire 23 is connected to a ground circuit (not shown) of the ECU 22 via a terminal fitting (not shown) of the connector 8. The second covered electric wire 23 transmits the above-described electrical noise from the drain wire 3 and guides it to a ground circuit (not shown).

  The waterproof tube 24 is made of an insulating synthetic resin or the like and is formed in a circular pipe (pipe) shape, that is, a tube shape. The waterproof tube 24 includes a terminal portion 5a near the ECU 22 of the sheath 5, the covered electric wire 2 and the drain wire 3 exposed from the terminal portion 5a, and the joint terminal 25 and the second covered electric wire 23 near the joint terminal 25. A terminal part is accommodated. As described above, the waterproof tube 24 passes the terminal portion 5a of the sheath 5 and the covered electric wire 2 and the drain wire 3 exposed from the terminal portion 5a of the sheath 5 inside.

  The waterproof cable 1 includes a first welded portion 1 a where one end 24 a of the waterproof tube 24 and the sheath 5 are welded, a second end 24 b of the waterproof tube 24, a covered electric wire 2, and a covered portion of the second covered electric wire 23. 7 is welded to the second welded portion 1b. In the first welding location 1a, as shown in FIG. 3, the one end portion 24a of the waterproof tube 24 and the portion accommodated in the one end portion 24a of the terminal portion 5a of the sheath 5 and overlapping the one end portion 24a are all. It is welded over the circumference.

  At the first welding location 1a, the one end portion 24a of the waterproof tube 24 and the above-described portion of the end portion 5a of the sheath 5 are in close contact with each other without generating a gap. In the 1st welding location 1a, between the one end part 24a of the waterproof tube 24 welded mutually and the part mentioned above of the terminal part 5a of the sheath 5 is watertight. That is, in the first welding location 1a, a liquid such as water enters the waterproof tube 24 from the outside through between the one end portion 24a of the waterproof tube 24 and the above-described portion of the end portion 5a of the sheath 5 that are welded to each other. In addition, the liquid such as water in the waterproof tube 24 is prevented from leaking out of the waterproof tube 24 through between the one end portion 24a of the waterproof tube 24 and the aforementioned portion of the terminal portion 5a of the sheath 5.

  In the second welding location 1b, the other end portion 24b of the waterproof tube 24 and the portion accommodated in the other end portion 24b of the covering portion 7 of the covered electric wires 2 and 23 and overlapping the other end portion 24b are all around the circumference. It is welded over. At the second welding location 1b, the other end portion 24b of the waterproof tube 24 and the above-described portion of the covering portion 7 of the covered electric wires 2 and 23 are in close contact with each other without generating a gap. At the second welding location 1b, the other end portion 24b of the waterproof tube 24 and the above-described portion of the covering portion 7 of the covered electric wires 2 and 23 are watertight.

  That is, at the second welding location 1b, a liquid such as water enters the waterproof tube 24 from the outside through the gap between the other end portion 24b of the waterproof tube 24 and the aforementioned portion of the covering portion 7 of the covered electric wires 2 and 23. Liquid such as water in the waterproof tube 24 passes outside the waterproof tube 24 through between the other end 24b of the waterproof tube 24 and the aforementioned portion of the cover 7 of the covered electric wires 2 and 23. Prevent leakage.

  In this way, the waterproof tube 24 covers the terminal portion 5a of the sheath 5 and the covered electric wires 2 and 23 and is welded thereto, so that the waterproof cable 1 is connected to the sheath 5 and the covered electric wire from the terminal portion 5a of the sheath 5. 2 and 23 to prevent liquid from entering. Further, since the waterproof tube 24 covers and welds the terminal portion 5a of the sheath 5 and the covered electric wires 2 and 23, the waterproof cable 1 leaks into the waterproof tube 24 from the terminal portion 5a of the sheath 5. The liquid is prevented from leaking out of the waterproof tube 24.

  In the waterproof cable 1 having the above-described configuration, the above-described welding locations 1a and 1b are formed by the high-frequency welding apparatuses 10a and 10b shown in FIGS. That is, the waterproof cable 1 has the one end 24a of the waterproof tube 24 and the sheath 5 welded by the high-frequency welding devices 10a and 10b shown in FIGS. 5 to 9, and the other end 24b of the waterproof tube 24 and the sheath. The covering portions 7 of the electric wires 2 and 23 are welded.

  As shown in FIGS. 5 to 9, the high-frequency welding devices 10 a and 10 b include a pair of electrodes 11 a and 11 b, an AC power source 12, a pair of guide plates 14 as a holding member, and the like. The electrodes 11a and 11b are made of a conductive metal, and are disposed opposite to each other with a space therebetween. Concavities and convexities are formed on the surfaces 13 of the electrodes 11a and 11b facing each other along the outer shape of the welded portions 1a and 1b of the waterproof cable 1 described above.

  Further, the pair of electrodes 11a and 11b are supported so as to be movable so that the aforementioned surfaces 13 are in contact with and away from each other. In addition, approaching / separating means approaching or separating from each other. The AC power supply 12 applies a high-frequency voltage of 0.5 kHz (kilohertz) to several tens of MHz (megahertz) such as 40 MHz (megahertz) between the pair of electrodes 11a and 11b.

  Each of the guide plates 14 is made of wood as an insulator and is formed in a plate shape. The guide plate 14 is attached to the electrode 11a. The pair of guide plates 14 are spaced apart from each other along a direction orthogonal (crossing) to a direction in which the electrodes 11a and 11b are in contact with (separate from) each other. The guide plate 14 is attached to the surface of the electrode 11a which is continuous with the surface 13 and can position the waterproof cable 1 on the surface 13 between each other. The guide plate 14 is detachably attached to the electrode 11a with a bolt or the like (not shown). Further, the guide plate 14 is in close contact with each of the electrodes 11a and 11b that are close to each other. The guide plate 14 prevents the object to be welded, which is positioned between the electrodes 11a and 11b and melted by high frequency heating, from protruding between the electrodes 11a and 11b.

  The high-frequency welding apparatuses 10a and 10b having the above-described configuration sandwich a plurality of welding objects to be welded between the aforementioned surfaces 13 of the pair of electrodes 11a and 11b, and pressurize these electrodes 11a and 11b in a direction to bring them closer to each other. In this state, a high frequency voltage is applied from the AC power supply 12 between the pair of electrodes 11a and 11b. The high-frequency welding apparatuses 10a and 10b heat (heat) the welding target object by the dielectric loss of the welding target object sandwiched between the electrodes 11a and 11b. The high frequency welding apparatuses 10a and 10b melt at least a part of the welding objects and weld these welding objects to each other. Thus, the high frequency welding apparatuses 10a and 10b heat the welding object so-called high frequency.

  The waterproof cable 1 having the above-described configuration is assembled as follows. First, the terminal metal fitting of the connector 8 is attached to both terminal portions 2a and 2b of the covered electric wire 2, and the conductor sheet 4 with the drain wire 3 attached to the outer periphery of the plurality of covered electric wires 2 is wound. At this time, the drain wire 3 is covered with the conductor sheet 4 and the drain wire 3 is made parallel to the covered electric wire 2. A plurality of covered electric wires 2 and drain wires 3 are covered with a sheath 5 for each conductor sheet 4. At this time, the covered electric wire 2 is exposed from both end portions 5a and 5b of the sheath 5, and the drain wire 3 is exposed from the end portion 5a. The drain wire 3 and the second covered electric wire 23 are connected by the joint terminal 25.

  The sheath 5, the covered electric wire 2, the drain wire 3, the joint terminal 25, and the second covered electric wire 23 exposed from the terminal portion 5 a of the sheath 5 are inserted into the waterproof tube 24. The waterproof tube 24 covers the end portion 5a of the sheath 5 on the side away from the space 20 and the portion of the covered wires 2 and 23 near the sheath 5. Thereafter, the one end 24a of the waterproof tube 24 and the sheath 5 are welded as follows, and the other end 24b of the waterproof tube 24 and the sheath 7 of the covered electric wires 2 and 23 are welded as follows. That is, the welding locations 1a and 1b described above are assembled as follows.

  When welding the one end portion 24a of the waterproof tube 24 and the sheath 5, that is, when assembling the first welding location 1a, first, as shown in FIG. 5, the pair of electrodes 11a and 11b are separated from each other. Then, one end 24a of the waterproof tube 24 is formed on the aforementioned surface 13 of one electrode 11a located in the lower part of FIG. 5, and the sheath 5, the conductor sheet 4, the covered electric wire 2, and the drain wire positioned in the one end 24a. Put three.

  Then, the pair of electrodes 11a and 11b are pressurized in a direction to approach each other. As shown in FIG. 6, the one end 24a of the waterproof tube 24 and the sheath 5, the conductor sheet 4, the covered electric wire 2, and the drain wire 3 positioned in the one end 24a are sandwiched between the pair of electrodes 11a and 11b. Then, a high frequency voltage is applied from the AC power source 12 between the pair of electrodes 11a and 11b. Then, the polarities of the electrodes 11a and 11b change at the frequency described above.

  The high frequency welding apparatus 10a moves the dipoles of the molecules constituting the waterproof tube 24 and the sheath 5 all at once, and collides, vibrates, and frictions with each other so that the one end 24a of the waterproof tube 24 and the sheath 5 are attached to each other. Generate heat from inside. In other words, the high-frequency welding apparatus 10a heats the one end 24a of the waterproof tube 24 and the sheath 5 due to dielectric loss of the waterproof tube 24 and the sheath 5 and the like. For this reason, the one end 24a of the waterproof tube 24 sandwiched between the pair of electrodes 11a and 11b, the sheath 5 and the like are uniformly heated in a short time (so-called high-frequency heating), and the portion sandwiched between the electrodes 11a and 11b. Do not heat anything. At least a part of the one end 24a of the heated (heated) waterproof tube 24 and the sheath 5 is melted.

  Then, when a predetermined time elapses after applying the high frequency voltage, the application of the high frequency voltage from the AC power supply 12 to the pair of electrodes 11a and 11b is stopped. Then, at least a part of the one end portion 24a of the heated waterproof tube 24 (heated) and the sheath 5 are melted, so that they are cooled and stick to each other. Thus, the one end 24a of the waterproof tube 24 and the sheath 5 are welded to each other. And as shown in FIG. 6, the 1st welding location 1a in which the one end part 24a and the sheath 5 of the waterproof tube 24 were welded to each other over the perimeter is formed.

  When welding the other end portion 24b of the waterproof tube 24 and the covering portion 7 of the covered electric wires 2 and 23, that is, when assembling the second welding portion 1b, first, as shown in FIG. , 11b are separated from each other. Then, the other end portion 24b of the waterproof tube 24 and the covered electric wires 2 and 23 positioned in the other end portion 24b are placed on the above-described surface 13 of the one electrode 11a located in the lower part of FIG.

  Then, the pair of electrodes 11a and 11b are brought close to each other. Then, since the waterproof tube 24 has flexibility, it is deformed into a flat shape so that the thickness gradually decreases as shown in FIG. 8 by being pushed by the electrodes 11a and 11b. Thereafter, the pair of electrodes 11a and 11b are pressurized in a direction to approach each other. As shown in FIG. 9, the other end 24b of the waterproof tube 24 and the covered electric wires 2 and 23 positioned in the other end 24b are sandwiched between the pair of electrodes 11a and 11b. Then, a high frequency voltage is applied from the AC power source 12 between the pair of electrodes 11a and 11b. Then, the polarities of the electrodes 11a and 11b change at the frequency described above.

  The high frequency welding apparatus 10b moves the molecular dipoles constituting the waterproof tube 24 and the covered portion 7 of the covered wires 2 and 23 all at once, and collides, vibrates and rubs with each other, thereby causing the other end 24b of the waterproof tube 24 to move. And the covered portions 7 of the covered electric wires 2 and 23 generate heat from their own. That is, the high frequency welding apparatus 10 b heats the other end 24 b and the covering portion 7 of the waterproof tube 24 due to dielectric loss between the waterproof tube 24 and the covering portion 7. For this reason, the other end portion 24b of the waterproof tube 24 sandwiched between the pair of electrodes 11a and 11b and the covering portion 7 of the covered electric wires 2 and 23 are uniformly heated in a short time (so-called high-frequency heating), and the electrodes No part other than the portion sandwiched between 11a and 11b is heated. At least a part of the other end 24 b of the heated (heated) waterproof tube 24 and the covering 7 of the covered electric wires 2 and 23 is melted.

  When a predetermined time elapses after applying the high frequency voltage, the application of the high frequency voltage from the AC power source 12 to the pair of electrodes 11a and 11b is stopped. Then, at least a part of the other end 24b of the heated waterproof tube 24 (heated) and the covering 7 of the covered electric wires 2 and 23 are melted, so that they are cooled and stick to each other. Thus, the other end 24b of the waterproof tube 24 and the covering portion 7 of the covered electric wire 2 are welded to each other. And as shown in FIG. 9, the 2nd welding location 1b in which the other end part 24b of the waterproof tube 24 and the coating | coated part 7 of the covered electric wires 2 and 23 welded each other over the perimeter is formed. Thus, the above-described waterproof cable 1 is obtained.

  The waterproof cable 1 obtained in this way is assembled to the wire harness 9 by inserting terminal fittings attached to both terminal portions 2 a and 2 b into the connector housing 21. In the wire harness 9, the connector 8 attached to the terminal portion 2b is connected to the electronic device arranged in the space 20, and the connector 8 attached to the terminal portion 2a is connected to the ECU 22 described above. The covered electric wire 23 is connected to a predetermined ground circuit or the like and wired in an automobile or the like. Thus, the terminal portion 2b of the covered electric wire 2 is disposed in the space 20 into which liquid such as water enters from the outside such as the engine room.

  The waterproof cable 1 causes the electrical noise to enter the core wire 6 of the covered electric wire 2 and the electric noise to be emitted from the core wire 6 of the covered electric wire 2 to the conductor sheet 4 and the conductor sheet 4. The ground circuit, that is, the outside of the waterproof cable 1 is released through the connected drain wire 3 or the like. Thus, the waterproof cable 1 electrically shields the core wire 6 of the covered electric wire 2.

  Further, liquid such as water that has entered between the terminal portion 2 b of the covered electric wire 2 and the terminal portion 5 b of the sheath 5 disposed in the space 20 is waterproof from between the terminal portion 5 a of the sheath 5 and the covered electric wire 2. It may be guided into the tube 24. At this time, the sheath 5 and the waterproof tube 24 are welded at the first welding location 1a, and the covering portion 7 of the covered electric wires 2 and 23 and the waterproof tube 24 are welded at the second welding location 1b. A liquid such as water that has entered the tube 24 is confined in the waterproof tube 24. In this manner, liquid such as water that has entered the waterproof tube 24 does not leak out of the waterproof tube 24, that is, the waterproof cable 1.

  According to the present embodiment, the sheath 5 and the covered electric wires 2 and 23 exposed from the end portion 5a of the sheath 5 are passed through the waterproof tube 24, and the waterproof tube 24 and the like are sandwiched between the electrodes 11a and 11b to which a high frequency voltage is applied. Then, the sheath 5 and the waterproof tube 24 are welded. Furthermore, the sheath 5, the covered electric wires 2 and 23, and the waterproof tube 24 are welded. Further, even if liquid such as water that has entered between the terminal portion 5 b positioned in the space 20 and the covered electric wire 2 leaks into the waterproof tube 24 from between the sheath 5 and the covered electric wires 2 and 23. Since the sheath 5 and the covered electric wires 2 and 23 and the waterproof tube 24 are welded by so-called high-frequency welding, the liquid can be confined in the waterproof tube 24. Therefore, the waterproof cable 1 can be assembled by welding the sheath 5 and the waterproof tube 24 by high-frequency welding, and by high-frequency welding the sheath 5, the covered electric wires 2 and 23, and the waterproof tube 24.

  For this reason, by applying a high frequency voltage for a very short time, the sheath 5 and the waterproof tube 24 are welded and the covered electric wires 2 and 23 and the waterproof tube 24 are welded by high frequency welding for welding the object to be welded. Thus, the waterproof cable 1 can be assembled. For this reason, the assembling work of the waterproof cable 1 can be easily performed. Furthermore, the time required for work can be shortened. Therefore, it is possible to improve the efficiency of the assembly work, and it is possible to reduce the time and man-hours required for assembly.

  Moreover, since the sheath 5, the covering portion 7 of the covered electric wires 2 and 23, and the waterproof tube 24 are heated from the inside by high-frequency heating, they can be heated uniformly and welded together. Further, since the sheath 5, the covering portion 7 of the covered wires 2 and 23, and the waterproof tube 24 are heated from inside by high frequency heating, the sheath 5 and the covered wires 2 and 23 other than the portion sandwiched between the electrodes 11a and 11b are waterproofed. It is possible to prevent the tube 24 from being heated and to reliably prevent such damage. Thereby, between the sheath 5 and the waterproof tube 24 can be kept watertight in the 1st welding location 1a, and between the coating | coated part 7 of the covered electric wires 2 and 23 and the waterproof tube 24 in the 2nd welding location 1b. Can be kept watertight.

  The pair of guide plates 14 prevent the sheath 5 melted from between the electrodes 11a and 11b, the covering portion 7 of the covered electric wires 2 and 23, the waterproof tube 24, and the like from protruding. For this reason, the waterproof tube 24 and the sheath 5 can be reliably high-frequency welded, and the space between them can be reliably kept watertight. Further, the waterproof tube 24 and the covering portion 7 of the covered electric wires 2 and 23 can be reliably welded with high frequency, and the space between them can be reliably kept watertight.

  The second covered electric wire 23 connected to the drain wire 3 and the waterproof tube 24 are welded by so-called high frequency welding. For this reason, between the 2nd covered electric wire 23 and the waterproof tube 24 can be reliably kept watertight.

  For this reason, the liquid leaked into the waterproof tube 24 from between the sheath 5 and the covered electric wire 2 can be confined in the waterproof tube 24. Therefore, it is possible to reliably prevent liquid leaking from between the sheath 5 and the covered electric wires 2 and 23 from leaking to the outside of the waterproof cable 1. Of course, liquid such as water can be prevented from entering between the sheath 5 and the covered wires 2 and 23 from the end portion 5a of the sheath 5.

  Further, by changing the polarity of the pair of electrodes 11a and 11b (by switching one of the electrodes 11a and 11b to a plus for a certain time and then switching the other to a plus), the waterproof tube 24 and the sheath 5 are adhered to each other. Therefore, the adhesion between the waterproof tube 24 and the covering portion 7 of the covered electric wires 2 and 23 can be improved. This is because if one of the electrodes 11a and 11b is positive and the other is negative during the welding operation, a high-frequency voltage is repelled to the core wire 6 and the like, and a portion that does not dissolve in the waterproof tube 24 is generated.

  Next, the inventors of the present invention confirmed the performance of the waterproof cable 1 of the present invention. The results are shown in Table 1.

  In the experiment whose results are shown in Table 1, the sealing properties were measured before and after the environmental test (thermal shock test) for each of the comparative examples and products of the present invention described later. In the thermal shock test, the comparative example and the product of the present invention were alternately left in an atmosphere of −50 ° C. and an atmosphere of + 120 ° C. for 1 hour and repeated 100 times.

  The comparative example is obtained by molding the covered electric wire 2 and the terminal portion 5a of the sheath 5 with a resin without using the waterproof tube 24 in the above-described embodiment. A gas of 50 kPa (kilopascal) was pressurized, and whether or not the pressurized gas leaked from between the sheathed electric wire 2 molded with resin and the sheath 5 was measured. The product of the present invention is the waterproof cable 1 according to the above-described embodiment. After the above-described test is performed, a gas of 50 kPa (kilopascal) is pressurized into the sheath 5 and applied from the above-mentioned welding locations 1a and 1b. It was measured whether the pressurized gas leaked.

  According to Table 1, in the product of the present invention, no gas leaked from the welding locations 1a and 1b in any case. For this reason, the waterproof tube 24 and the sheath 5 are welded by high-frequency welding using high-frequency heating, and the waterproof tube 24 and the covering portion 7 of the covered electric wires 2 and 23 are welded to ensure watertightness therebetween. It became clear that it was possible to.

  On the other hand, in the comparative example, before the environmental test (thermal shock test) was performed, no leakage was recognized even when the gas of 50 kPa was pressurized. However, in the comparative example, after applying an environmental test (thermal shock test), when a gas of 40 kPa was pressurized, gas leakage was recognized. For this reason, it became clear that it was difficult for the comparative example to keep watertight between the sheath 5 and the covered electric wire 2.

  In the embodiment described above, three covered electric wires 2 are provided. However, in the present invention, any number of covered wires 2 may be provided, that is, one or more wires may be provided.

  In the embodiment described above, both of the pair of guide plates 14 are attached to the electrode 11a. However, in the present invention, one guide plate 14 may be attached to the electrode 11a and the other guide plate 14 may be attached to the electrode 11b, or both of the pair of guide plates 14 may be attached to the electrode 11b. In short, in the present invention, the pair of guide plates 14 may be attached to either one of the electrodes 11a and 11b.

  Furthermore, in the present invention, any member made of an insulator other than the guide plate 14 may be provided as the holding member as long as the waterproof tube 24 or the like melted between the electrodes 11a and 11b can be prevented from protruding.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is a top view which shows the structure of the wire harness provided with the waterproof cable which concerns on one Embodiment of this invention. FIG. 2 is a plan view of the waterproof cable shown in FIG. 1. It is sectional drawing which follows the III-III line | wire in FIG. It is sectional drawing which follows the IV-IV line | wire in FIG. It is explanatory drawing which shows the state which put the one end part etc. of the waterproof tube before welding on one electrode of the high frequency welding apparatus which forms the 1st welding location of the waterproof cable shown by FIG. It is explanatory drawing which shows the state which formed the 1st welding location with the high frequency welding apparatus shown by FIG. It is explanatory drawing which shows the state which put the other end part of the waterproof tube before welding, etc. in one electrode of the high frequency welding apparatus which forms the 2nd welding location of the waterproof cable shown by FIG. FIG. 8 is an explanatory diagram illustrating a state where the electrodes illustrated in FIG. 7 are brought close to each other. It is explanatory drawing which shows the state which formed the 2nd welding location with the high frequency welding apparatus shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waterproof cable 2 Coated electric wire 2a, 2b Terminal part 3 Drain wire 4 Conductor sheet (shield layer)
5 Sheath (insulating layer)
5a terminal portion 7 covering portion 11a electrode 11b electrode 14 guide plate (holding member)
23 Second covered electric wire 24 Waterproof tube 24a One end 24b The other end

Claims (3)

A coated electric wire and an insulating layer made of a synthetic resin and further covering the coated electric wire and exposing a terminal portion of the coated electric wire, between the insulating layer and the coated electric wire from the terminal portion of the insulating layer In a method for manufacturing a waterproof cable, which prevents liquid from entering the liquid and leaks from the terminal portion of the insulating layer to the outside.
Passing the end portion of the insulating layer and the covered electric wire exposed from the end portion of the insulating layer through the waterproof tube made of synthetic resin,
One end of the waterproof tube and the end portion of the insulating layer in the one end are sandwiched between a pair of electrodes to which a high-frequency voltage is applied, and the pair of electrodes are pressed in a direction approaching each other, so By applying a high frequency voltage, the one end of the waterproof tube and the end of the insulating layer are welded to each other ; and
The other end portion of the waterproof tube and the covered electric wire in the other end portion are sandwiched between a pair of electrodes to which a high-frequency voltage is applied, and the pair of electrodes are pressed in a direction to approach each other, so By applying a voltage, the other end of the waterproof tube and the covering of the covered wire are welded together,
The pair of electrodes is attached with a pair of holding members made of an insulator that positions the waterproof tube between each other when the waterproof tube is sandwiched between them.
The pair of holding members are spaced apart from each other along a direction in which the pair of electrodes cross each other, and a waterproof tube melted by application of the high-frequency voltage is provided between the pair of electrodes. A method for manufacturing a waterproof cable, wherein the waterproof cable is prevented from protruding . The waterproof cable is accommodated in the insulating layer and covers the covered electric wire and is made of a conductor, and a shield layer,
A drain line housed in the insulating layer and electrically connected to the shield layer;
A second covered electric wire electrically connected to the drain wire,
When welding the other end portion of the waterproof tube and the covering portion of the covered electric wire, a second covered electric wire is further sandwiched between a pair of electrodes, and the other end portion of the waterproof tube and the second covering portion are sandwiched. The method for manufacturing a waterproof cable according to claim 1 , wherein the covering portion of the electric wire is further welded to each other. A coated electric wire and an insulating layer made of a synthetic resin and further covering the coated electric wire and exposing a terminal portion of the coated electric wire, between the insulating layer and the coated electric wire from the terminal portion of the insulating layer In a waterproof cable that prevents liquid from entering into and prevents liquid leaking from the terminal portion of the insulating layer from leaking outside,
A waterproof tube made of a synthetic resin and passing the coated electric wire exposed from the terminal portion of the insulating layer and the terminal portion of the insulating layer inside ,
A shield layer housed in the insulating layer and covering the covered electric wire and made of a conductor;
A drain line housed in the insulating layer and electrically connected to the shield layer;
A second covered electric wire electrically connected to the drain wire;
With
One end portion of the waterproof tube and the end portion of the insulating layer in the one end portion are sandwiched between a pair of electrodes to which a high frequency voltage is applied, and the pair of electrodes are pressed in a direction to approach each other, thereby By applying a high-frequency voltage to the one end of the waterproof tube and the end of the insulating layer , and
The other end of the waterproof tube and the covered electric wire in the other end are sandwiched between a pair of electrodes to which a high-frequency voltage is applied, and the pair of electrodes are pressed in a direction to approach each other, and By applying a high frequency voltage, the other end portion of the waterproof tube and the covering portion of the covered electric wire are welded together,
The covering portion of the second covered electric wire and the other end portion of the waterproof tube are sandwiched between the pair of electrodes and are welded to each other by applying a high frequency voltage to the pair of electrodes. Features a waterproof cable.

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