JP4710315B2 - Shielded wire, casing connected to it, method for connecting them, and shielded wire unit - Google Patents

Description

  The present invention relates to a shielded electric wire for power supply of equipment, and more particularly to a shielded electric wire used for power supply to various equipment of an automobile.

  The shielded electric wire has a braided shield composed of braids such as a copper wire and a tin-plated copper wire having a wire diameter of several tens to several hundreds of μm on the outside of the covered electric wire. By connecting a metal connector to both ends of the braided shield and grounding the connector, a shielding effect for preventing malfunction due to electromagnetic waves or the like can be obtained.

  In recent years, in automobiles, the spread of hybrid cars and the electrification of equipment are progressing. For this reason, in shielded wires used in various devices of automobiles, higher voltages and higher currents have been achieved. In addition, as the number of wiring materials (shielded wires) tends to increase with the spread of hybrid vehicles and the electrification of equipment, the space for installing wiring materials can be saved (bending of wiring materials is easy). Is required).

  As shown in FIG. 35, connection terminals 356 and 356 are crimped to both ends of the shielded electric wire 350, and a crimp mark 356a is formed in the crimping portion. As shown in FIG. 36, the shield wire 350 has an insulator 355, a braided shield 352, a coating layer (insulator) 351 on the outer periphery of the conductor 357 in this order from the inner periphery side. Have As shown in FIG. 37, a cross-sectional view taken along line 37-37 of the shielded electric wire 350 is to peel off the covering material 351 at both ends of the shielded electric wire, fold back the braided shield 352, and crimp it to the folded back end of the braided shield 352. A ring 353 is provided. A shield connector 354 is provided at the folded base of the braided shield 352 (the boundary between the braided wire 352 and the insulator 355). The shield connector 354 has a screw terminal (not shown) for grounding, and is grounded via this terminal.

  As shown in FIG. 38, a shielded wire unit 380 formed by connecting a shielded wire and a transmission-side power supply housing has a plurality (six in FIG. 38) of shielded wires 350 and a resin casing 381. The housing 381 includes a bottomed frame body 382 and a housing cover 383 that covers the upper surface of the frame body 382, and the frame body 382 and the housing cover 383 are fixed by a fixing screw 384. In addition, recently, there is a case in which the frame is configured by a metal shield case (for example, see Patent Document 1).

  A plurality of openings are provided in the side wall of the frame body 382, and the shielded electric wire 350 is inserted into the frame body 381 through the openings. A waterproof cover 385 for preventing water from entering from outside is provided in the gap between the shielded electric wire 350 and the opening. The bottom portion 382a of the frame body 382 is made of an insulating material, and the terminal block 386 and the ground terminal block 387 are placed on the bottom portion 382a. Although not shown, the terminal block 386 includes wiring for supplying a current to the transmission, and the ground terminal block 387 is structured to be grounded to the outside.

  The connection terminal 356 of the shielded electric wire 350 is screwed to the terminal block 386 by a washer 388 and a bolt 389. Further, the shield connector 354 of the shielded electric wire 350 is screwed to the ground terminal block 387 with a bolt 390.

JP 2002-208456 A

  Since the conventional shielded wire 350 uses a heat-resistant resin as the insulator 355 and is entirely covered with the braided shield 352, the bendability is not good. For this reason, when the shielded electric wire 350 is attached to the vehicle body or the like, it is difficult to bend the shielded electric wire 350 along the shape of the attachment location, and there is a difficulty in handling at the time of attachment.

  Further, it is necessary to attach the shield connector 4 to the ground terminal block 387 after the shield wire 350 is attached to a predetermined attachment position of the housing 381, but there is a problem that this attachment work efficiency is not good.

  Furthermore, depending on the location where the shielded electric wire 350 is attached, muddy water, gravel, or the like may fly, and the gravel may hit the shielded electric wire 350, so that the covering material 1 may be broken.

  In addition, when the shielded electric wire 350 is attached to a location close to the engine of an automobile, it is exposed to vibration and high temperature. Therefore, if the heat resistance limit is exceeded, the coating material 351 may crack and the braided shield 352 may be corroded or broken. As a result, there is a problem that the shielding effect is lowered. For this reason, it is necessary to make the coating | covering material 351 into the strong structure and material which can endure a vibration and high temperature. In particular, it is necessary to flow a large current through a shielded electric wire used for connection with a power supply housing on the transmission side, and naturally a current also flows through a braided shield 352 used as a shield. As a result, the braided shield 352 generates heat, and there is a possibility that the resistance value at the connection portion between the power supply housing and the shielded electric wire becomes high. Further, as a result of the braided shield 352 being heated, the covering material 351 may be exposed to a high temperature, and the covering material 351 may be cracked.

  The object of the present invention, which was created in view of the above circumstances, is to provide a shielded electric wire with good bendability, impact resistance, and heat resistance, a casing connected thereto, a method for connecting them, and a shielded electric wire unit. There is to do.

In order to achieve the above object, a shielded electric wire according to the present invention is a shielded electric wire comprising an electric wire main body formed by coating a conductor made of a single wire or a stranded wire with an insulator, and a shield member provided on the outer periphery of the electric wire main body. The shield member is composed of a cylindrical body provided with a braided shield and an outer sleeve around the inner sleeve, and a metal pipe provided in abutment with the cylindrical body. one end of the outer sleeve and one end of the metal pipe and connected by Ri electrical to the fusion bonding is obtained by inlaid tubular connecting member to the non-cylindrical side of the metal pipe.

Here, it is preferable to provide a cone-shaped enlarged portion at the other end of the metal pipe.

  The connecting member may be a nut member having a female screw portion on its inner peripheral portion. Moreover, the connection member may have an external thread part in the outer peripheral part.

  The metal pipe and the connection member are preferably made of aluminum or an aluminum alloy.

Moreover, the connection method of the shielded electric wire and the housing according to the present invention includes: an electric wire main body in which the shield electric wire covers a conductor made of a single wire material or a stranded wire material with an insulator; and a shield provided on an outer periphery of the electric wire main body. The shield member is composed of a cylindrical body in which a braided shield and an outer sleeve are sequentially provided around the inner sleeve, and a metal pipe provided in abutment with the cylindrical body, and is composed of metal. The housing includes at least one convex shielded wire connecting portion, and the shielded wire connecting portion has a wire main body insertion hole at a central portion thereof, and one end of the outer sleeve on one end side of the cylindrical body. and a step of electrically connecting by melt bonding the one end of the metal pipe, comprising the steps of inlaid tubular connecting member to the other end of the metal pipe, the other end of the metal pipe The parts are those comprising the steps of abutting on the shield wire connecting portion, and the step of mechanically connecting said connecting member and said shield wire connecting portion.

Here, after the fitting step, a step of expanding the end of the other end of the metal pipe in a cone shape may be further provided.

Abutting step, the electric wire body which projects from the other end of the metal pipe, inserted into the electric wire body insertion hole of the shielded wire connecting portion, the end of the other end portion of the metal pipe to the shield wire connecting portion It may be something to be seated.

  The mechanical connection step may be such that the female screw portion formed on the inner peripheral portion of the connecting member and the male screw portion formed on the outer peripheral surface of the shielded wire connecting portion are screwed together.

  The mechanical connection step may screw the male screw portion formed on the outer peripheral portion of the connecting member and the female screw portion formed on the inner peripheral surface of the wire main body insertion hole of the shielded electric wire connecting portion.

The shielded electric wire unit according to the present invention is a shielded electric wire unit in which at least one shielded electric wire and a housing are connected, and the shielded electric wire covers a conductor made of a single wire or a stranded wire with an insulator. An electric wire body, and a shield member provided on the outer periphery of the electric wire body, and the shield member is provided with a braided shield and an outer sleeve around the inner sleeve, and the cylindrical body. The casing made of metal is provided with a metal pipe provided in contact with each other, and has at least one convex shielded wire connecting portion, and the shielded wire connecting portion has a wire body insertion hole at the center thereof. is intended to electrically connect by melt bonding the end of the outer sleeve and the metal pipe at one end of the tubular body, the tubular to the other end of the metal pipe The connection member was inlaid, the other end of the metal pipe, butt to the shield wire connection portion is obtained by mechanically connecting the connecting member and the shield wire connecting portion.

  According to the present invention, an excellent effect is obtained that a shielded electric wire having excellent impact resistance, heat resistance, and connectivity with a housing is obtained.

  A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows a plan view of a shielded electric wire according to a preferred embodiment of the present invention.

  As shown in FIG. 1, the shielded electric wire according to the present embodiment is provided with a shield member around an electric wire body 20 formed by covering a conductor 17 made of a single wire or a stranded wire with an insulator 15. The connection terminals 16 and 16 are connected to both ends of the shielded electric wire. The connection terminal 16 on one side (left side in FIG. 1) is connected to, for example, an inverter side described later, and the connection terminal 16 on the other side (right side in FIG. 1) is connected to, for example, a transmission side described later.

  The shield member includes a cylindrical body 50 shown in FIG. 5 and a metal pipe 11 shown in FIG. The cylindrical member 50 and the metal pipe 11 are provided to face each other, and the cylindrical member 50 and the metal pipe 11 are electrically connected via the welded portion 140, whereby the shield member is formed. As shown in FIGS. 5 and 6, the cylindrical body 50 is formed by sequentially providing a braided shield 12 and an outer sleeve 22 around the inner sleeve 21. The braided shield 12 is a long member provided over the entire length of the cylindrical body 50. The inner sleeve 21 and the outer sleeve 22 are short members that cover the vicinity of the transmission side end portion of the cylindrical body 50.

  The shield layer in the shield member is different in the longitudinal direction of the shielded electric wire, and specifically, it is different at the outer sleeve 22 portion of the cylindrical body 50 as a boundary. That is, the shield layer on the inverter side is the braided shield 12, and the shield layer on the transmission side is the metal pipe 11. For this reason, the cross-sectional shape of the outer sleeve 22 is varied in the longitudinal direction.

  As shown in FIG. 2, the outer sleeve 22 on the inverter side is a molded portion 22 a having a polygonal cross section (hexagonal shape in FIG. 2). As shown in FIG. 3, the outer sleeve 22 on the transmission side is a non-molded portion 22b having a circular cross section.

  The shield member is provided so as to surround the electric wire main body 20, and has a space portion 23 for enclosing the electric wire main body therein (see FIGS. 2 to 4). That is, a gap is provided between the electric wire body 20 and the shield member. As a result, the bendability of the shielded electric wire is improved, and no stress is applied to the electric wire body 20 when the shielded electric wire is bent.

  As shown in FIG. 30, it is tubular on the end of the shielded wire on the transmission side (right side in FIG. 30) and on the non-cylindrical side (transmission side, right side in FIG. 31) of the metal pipe 11 as shown in FIG. A connecting member (for example, a long nut member) 310 and a washer 315 are sequentially fitted. A female screw portion 312 is formed on the transmission side of the inner peripheral surface 311 of the connection member 310. After fitting the connecting member 310 and the washer 315, a cone-shaped enlarged diameter portion 320 is formed at the transmission side end of the metal pipe 11, as shown in FIG. By forming the enlarged diameter portion 320, the connecting member 310 and the washer 315 are prevented from falling off. The inner diameter of the inner peripheral surface 311 of the connection member 310 is set to be slightly larger than the outer shape of the metal pipe 11. The female screw portion 312 may be formed partway along the length direction of the inner peripheral surface 311 (left and right direction in FIG. 31), or may be formed over the entire length of the inner peripheral surface 311.

  A crimp ring 13 is provided near the end of the braided shield 12 on the inverter side of the cylindrical body 50. A shield connector 14 is provided at the end of the braided shield 12 on the inverter side. The shield connector 14 has a screw terminal 14a for grounding, and is grounded via the terminal 14a. The braided shield 12 between the crimp ring 13 and the outer sleeve 22 is covered by an insulating coating 18.

  The outer sleeve 22, the metal pipe 11, the connecting member 310, and the washer 315 are preferably made of the same material (or a material having substantially the same chemical composition). Specifically, as the constituent material of the outer sleeve 22, the metal pipe 11, the connection member 310, and the washer 315, aluminum or an aluminum alloy, preferably an Al—Si—Mg alloy having good corrosion resistance and brazing properties can be given. . As the outer sleeve 22 and the metal pipe 11, for example, a tube material made of A6063 and having an inner diameter of 10 mm and a wall thickness of 1 mm is used. As the connection member 310, for example, a nut member made of A6063 and having an inner diameter of 16 mm is used. The washer 315 is made of, for example, A6063, and has an outer diameter of 14 mm, an inner diameter of 12 mm, and a thickness of 2 mm.

  Here, by configuring the metal pipe 11 with aluminum or an aluminum alloy, the metal pipe 11 can protect the electric wire body 20 from high heat even if a shielded electric wire is laid near a device that is lightweight and generates high temperature. This is because the heat generated in the braided shield 12 can be efficiently radiated. The reason why the outer sleeve 22, the metal pipe 11, the connection member 310, and the washer 315 are made of the same material (or a material having substantially the same chemical composition) is to join the same kind of metal. This is because in the case where the joining is between different metals, if moisture adheres to the joining portion, a potential difference is generated and corrosion may occur.

  Examples of the constituent material of the inner sleeve 21 include stainless steel, preferably austenitic stainless steel. As the inner sleeve 21, for example, a tube material made of SUS304 (JIS standard) and having an outer diameter of 9 mm and a wall thickness of 0.2 mm is used.

  Examples of the constituent material of the braided shield 12 include aluminum or an aluminum alloy, preferably an Al—Fe—Zr alloy having high heat resistance, bending resistance and good elongation and high strength. As the braided shield 12, for example, a braided wire made of an Al—Fe—Zr alloy and having a wire diameter of 0.2 mm is used. The length of the braided shield 12 varies depending on the use of the shielded wire and the installation location, but is, for example, 200 mm in length.

  The conductor 17 may be either a single wire material or a stranded wire material obtained by twisting a plurality of single wire materials, and all conductors conventionally used as shielded wires are applicable. For example, 19 tin-plated copper wires having an outer diameter of 0.32 mm are twisted to form a core wire, and 19 more core wires are twisted to form a stranded wire material (conductor 17). In addition, as the insulator 15 covering the conductor 17, all insulators conventionally used as shielded wires can be applied, and examples thereof include Frontrex (registered trademark).

  As the connection terminal 16, all connection terminals conventionally used as shielded wires can be applied, for example, 38-S6 (the inner diameter of the wire gripping portion is 9.4 mm, the outer diameter is 13.3 mm, and the length is 14 mm). Can be mentioned.

  Next, the manufacturing method of the shielded wire according to the present embodiment will be described.

  First, the cylinder 50 shown in FIGS. 5 and 6 is prepared. As shown in FIG. 7, the cylinder 50 is arranged in a space 74 formed by the die surfaces 73a and 73b of the compression dies 71 and 72. To do. At this time, the outer sleeve 22 on the inverter side is disposed in the space 74.

  Thereafter, as shown in FIG. 8, the compression dies 71 and 72 are moved in directions close to each other, whereby the outer sleeve 22 is compressed from the outside. Thereafter, dies 81 and 82 are also inserted into the internal space 80 of the cylindrical body 50 in the compression-molded portion, and the outer sleeve 22 is compression-molded from the outside and the inside. Accordingly, as shown in FIGS. 9 and 10, the inner sleeve 21, the braided shield 12, and the outer sleeve 22 are mechanically joined to the portion of the outer sleeve 22 sandwiched between the dies 71, 72 and 81, 82. The formed portion 22a is formed, and the remaining outer sleeve 22 becomes the unformed portion 22b.

  Here, the forming portion 22a is formed in order to secure a contact area between the braided shield 12 and the outer sleeve 22 and increase electrical contact, and the braided shield 12 and the outer sleeve 22 are integrally joined. This is to ensure the mechanical strength of the braided shield 12 in the molding portion 22a.

  On the other hand, as shown in FIG. 11, an electric wire body 20 in which the conductor 17 is covered with an insulator 15 is prepared, and one end side (right side in FIG. 11) of the electric wire body 20 is inserted into the metal pipe 11. In a state where the electric wire body 20 is inserted into the metal pipe 11, a predetermined bending process is performed on the metal pipe 11 prior to fusion bonding described later. This bending process may be performed after the melt bonding.

  Next, as shown in FIG. 12, the other end side (the left side in FIG. 12) of the electric wire body 20 is inserted into the cylindrical body 50 shown in FIG. As a result, the unformed portion 22b of the outer sleeve 22 in the cylindrical body 50 and the metal pipe 11 are brought into contact with each other.

  Next, as shown in FIG. 13, the braided shield 12 exposed from the unmolded portion 22 b of the cylindrical body 50 (hereinafter referred to as an exposed shield 130) is expanded radially outward, and a metal is interposed between the braided shield 12 and the inner sleeve 21. The pipe 11 is inserted and brought close to the extent that the unformed portion 22b of the outer sleeve 22 and the metal pipe 11 are almost in contact with each other. As a result, the exposure shield 130 is covered on the cylindrical body side end portion (the left end portion in FIG. 13) of the metal pipe 11.

In the following, as shown in FIG. 14, laser welding machine (e.g., YAG laser welding machine) 141 to oscillate the laser beam L from the laser welding machine head 142, with the laser beam L, unshaped outer sleeve 22 The adjacent portion between the portion 22b and the metal pipe 11 is fusion bonded. That is, in this proximity portion, the end surface of the outer sleeve 22 and the end surface of the metal pipe 11 are welded with the braided shield 12 interposed. This fusion bonding is continuously performed over the entire circumference of the proximity portion. As a result, the metal pipe 11, the outer sleeve 22, and the braided shield 12 are reliably welded at the melt-bonded portion 140 and are joined metallically. As a result, corrosion and heat generation at the melt bonded portion 140 are suppressed. Further, by performing fusion bonding of the proximity portion with the exposure shield 130 placed on the cylindrical body side end portion of the metal pipe 11, the electrical connection of the metal pipe 11, the outer sleeve 22, and the braided shield 12 becomes more reliable. .

  Thereafter, the braided shield 12 exposed from the exposed shield 130 and the molded portion 22a of the cylindrical body 50 (hereinafter referred to as the exposed shield 145) is insulated. For example, heat-shrinkable tubes each having a length that completely covers the exposure shields 130 and 145 are prepared, and the heat-shrinkable tubes are shrunk by hot blow after being placed on the exposure shields 130 and 145 so as to adhere to the shield member. And insulate.

  In the shielded electric wire according to the present embodiment, the metal pipe 11 is not used over the entire length in the longitudinal direction as the shield layer of the shield member, but the side exposed to high temperatures (for example, the transmission side) is strong and heat resistant. Is constituted by a good metal pipe 11, and the other side (for example, the inverter side) is constituted by a braided shield 12. When the entire shield layer is composed of the metal pipe 11, the heat resistance of the shield member becomes good over the entire length of the shielded electric wire. However, since the shock caused by vibration concentrates on the connection portion of the shielded wire on the transmission side, it is not preferable. Therefore, in the shielded electric wire according to the present embodiment, a braided shield 12 having flexibility is used to avoid impact concentration, and a hybrid structure of the braided shield 12 and the metal pipe 11 is used.

  In the shielded electric wire according to the present embodiment, the inverter side of the outer sleeve 22 in the cylindrical body 50 constituting the shield member is compression-molded into a molded portion 22a having a polygonal cross section. Thereby, the outer sleeve 22 and the braided shield 12 are pressure-bonded, and a contact area between them, that is, electrical contact can be sufficiently ensured. Here, since the outer sleeve 22, the metal pipe 11, and the braided shield 12 are melt-bonded, the current flowing through the braided shield 12 of the shield member is the current of the braided shield 12 → the braided shield 12 and the outer sleeve 22 → the metal pipe 11. It flows in order. Since a large current flows through the braided shield 12, Joule heat is generated. At this time, if the electrical contact between the outer sleeve 22 and the braided shield 12 is insufficient, the current is less likely to flow through the outer sleeve 22, resulting in an increase in resistance and the braided shield 12, outer sleeve 22, and aluminum. The temperature of the melt joint 140 of the pipe 11 rises. As this temperature rises, a vicious cycle occurs in which the resistance value of the melt-bonded portion 140 is further increased. As a result, the melt-bonded portion 140 is melted, and the joining between the cylinder 50 and the metal pipe 11 may be insufficient.

  In the shielded electric wire according to the present embodiment, the transmission side of the outer sleeve 22 in the cylindrical body 50 constituting the shield member is formed as a non-molded portion 22b having a circular cross section without being compression molded. As a result, the metal pipe 11 having a circular cross section and the cylindrical body 50 can be easily and reliably joined.

  In the shielded electric wire according to the present embodiment, the shape of the braided shield 12 can be satisfactorily maintained during compression molding of the molded portion 22a by configuring the inner sleeve 21 with stainless steel having excellent strength. Further, since the inner sleeve 21 is made of stainless steel having a low thermal conductivity, the thermal effect is not exerted on the electric wire body 20 inside the shield member when the cylindrical body 50 and the metal pipe 11 are melt-bonded.

  The shielded electric wire according to the present embodiment has a higher shielding effect and higher reliability than conventional materials. In the conventional shielded wire 350 shown in FIG. 35, when the coating layer 351 of the shield member is broken due to high temperature, vibration, etc., the braided shield 352 is corroded and disconnected, and there is a possibility that the shielding effect cannot be obtained. In the shielded electric wire according to the present embodiment, the shield layer at a location exposed to high temperature and vibration is made of the metal pipe 11, for example, an aluminum pipe. Therefore, the aluminum pipe has an effect of conducting heat and radiating heat. Moreover, even when the coating layer is broken and the aluminum pipe is exposed, the shielding effect is maintained because the aluminum pipe has good strength and heat resistance. Moreover, since an oxide film is formed on the surface of aluminum, the aluminum pipe is excellent in corrosion resistance.

  As described above, the shielded electric wire according to the present embodiment is expected to be subjected to external impact such as vibration, and can be attached to a location where the temperature becomes high, and a heat generation phenomenon in the shield member can be avoided. Therefore, the shielded electric wire according to the present embodiment has heat resistance and corrosion resistance, such as a portion (engine, motor, transmission, etc.) near the engine that becomes high temperature, an electric braking device, an electric steering device, etc. It is suitable for devices that are strongly required.

  In the manufacturing method of the shielded electric wire according to the present embodiment, as shown in FIG. 13, after the exposure shield 130 is put on the cylindrical body side end portion of the metal pipe 11, the unformed portion 22 b of the outer sleeve 22 and the metal pipe 11 are covered. Although the case where the adjacent part of the material is melt-bonded has been described, the present invention is not particularly limited thereto.

  For example, as shown in FIG. 15, the metal pipe 11 prepared in advance is placed on the exposure shield 130, and the unformed portion 22 b of the outer sleeve 22 and the metal pipe 11 are brought into contact with each other. Thereafter, as shown in FIG. 16, the contact portion may be melt-bonded to form a melt-bonded portion 140. The inner diameter of the metal pipe 11 is formed slightly larger than the outer diameter of the braided shield 12.

  Further, as shown in FIG. 17, after the exposure shield 130 is folded back (turned up) to the unformed portion 22b side of the outer sleeve 22, the metal pipe 11 prepared in advance is put on the inner sleeve 21 and the outer sleeve 22 is covered. The unformed part 22 b of the sleeve 22 and the metal pipe 11 are brought into contact with each other through the exposure shield 130. Thereafter, as shown in FIG. 18, the contact portion may be melt-bonded to form a melt-bonded portion 140. The inner diameter of the metal pipe 11 is formed slightly larger than the outer diameter of the inner sleeve 21.

  In addition, as shown in FIG. 19, after the exposure shield 130 is folded back toward the non-molded portion 22 b of the outer sleeve 22, the metal pipe 11 prepared in advance is covered to the tip 191 of the folded portion of the exposure shield 130. After that, as shown in FIG. 20, melt bonding may be performed at the position of the tip 191 of the folded portion to form the melt bonded portion 140. The inner diameter of the metal pipe 11 is slightly larger than the outer diameter of the folded portion of the exposure shield 130.

  In the shielded wire manufacturing method according to the present embodiment, the case where the unformed portion 22b of the outer sleeve 22 and the adjacent portion of the metal pipe 11 are melt-bonded by laser welding has been described. It is not limited to. For example, fusion methods other than laser welding, for example, welding methods such as electron beam welding, TIG welding, and MIG welding may be used. Since electron beam welding is performed in a vacuum chamber, the generation of oxides can be suppressed, and the number of heat-affected zones other than the portion to be melted can be reduced. For this reason, the strength reduction in the melt bonded portion 140 is reduced. TIG welding can prevent oxidation by the shielding gas, and the apparatus is simple, so the welding cost is low. In MIG welding, welding metal is supplied and welding is performed while preventing oxidation with a shielding gas, so that the thin wire constituting the braided shield 12 can be pressed in with molten metal, and the appearance is a beautiful fusion joint 140 can be obtained. Further, instead of welding, an ultrasonic bonding method that is solid phase bonding, a friction diffusion bonding (FSW) method, or the like may be used.

  Next, a housing according to a preferred embodiment of the present invention will be described.

  FIG. 26 shows a partially broken plan view of the housing according to the preferred embodiment of the present invention.

  As shown in FIG. 26, the casing 260 according to the present embodiment is connected to at least one shielded electric wire (six in FIG. 26) according to the present embodiment shown in FIG.

  The housing 260 mainly includes a frame body 261 having a bottom portion 262 and a housing cover 263 that is a lid of the frame body 261. The housing cover 263 and the frame body 261 are fixed with screws by fastening means 264 such as bolts and screws.

  A convex shield electric wire connecting portion 290 is provided on a side surface (left side surface in FIG. 26) of the frame body 261. The number of shielded wire connection portions 290 corresponds to the number of shielded wires. As shown in FIG. 29, the shielded electric wire connecting portion 290 has a cylindrical protruding portion 271 protruding from the frame body 261, and a male screw portion 273 is formed on the outer periphery of the protruding portion 271. In addition, an insertion hole (electric wire main body insertion hole) 274 for inserting the electric wire main body is provided at the central portion of the shielded electric wire connecting portion 290.

  A terminal block 265 is provided on the bottom 262 of the frame 261. A wiring (not shown) provided through the bottom 262 is connected to the terminal block 265.

  The lower surface of the housing 260, that is, the lower surface of the frame body 261 is installed, for example, on the casing surface of the transmission and is in a grounded state.

  In addition, annular grooves are formed on the upper surface and the lower surface of the frame 261, respectively. A sealing member such as an O-ring is fitted in this groove. By this seal member, airtightness between the casing 260 and the transmission casing and between the frame body 261 and the housing cover 263 is ensured.

  The casing 260 is made of metal, preferably aluminum or aluminum alloy, except for the bottom 262 of the frame 261. The housing cover 263 may be made of a material other than metal, for example, resin. The bottom portion 262 is made of an insulating material.

  As a constituent material of the housing 260 and the shielded electric wire connecting portion 290, aluminum or an aluminum alloy, preferably an Al—Si—Mg alloy having good corrosion resistance and brazing properties can be given. The casing 260 is made of, for example, A6063, and a box member having a thickness of 15 mm is used. Further, as the shielded electric wire connecting portion 290, for example, one made of A6063 having a connecting portion outer diameter of 16 mm and a connecting portion length of 20 mm with the housing 260 is used.

  An example of forming the shielded wire connecting portion 290 is shown below.

  As shown in FIG. 27, a through hole 275 is formed on the side surface of the frame 261. As shown in FIG. 28, a convex connection member 270 is fitted into the through hole 275. The connection member 270 includes a fitting portion 272 having the same shape and the same size as the through hole 275 and a cylindrical protruding portion 271. Thereafter, by welding the boundary portion 281 between the frame body 261 and the connecting member 270, the frame body 261 and the connecting member 270 are welded via the welded portion 291, and the shielded wire connecting portion 290 is obtained.

  In the case 260 according to the present embodiment, the case where the frame body 261 and the connection member 270 have separate structures has been described, but the present invention is not particularly limited thereto. For example, when casting the frame body of the housing 260, the frame body portion and the connection member portion may be integrally cast. A male screw portion 273 may be formed on the outer periphery of the protruding portion 271 of the connecting member provided integrally with the frame body, and the shielded wire connecting portion 290 may be formed.

  Further, in the case 260 according to the present embodiment, the case where the male screw portion 273 is formed on the outer periphery of the protruding portion 271 of the connection member 270 has been described, but the present invention is not particularly limited thereto. For example, a female screw portion may be formed on the inner peripheral surface of the insertion hole 274 of the connection member 270. In this connection member, the inner diameter of the female screw portion is larger than that of the insertion hole 274, and the enlarged diameter portion 320 (see FIG. 32) of the metal pipe 11 is applied to the stepped portion of the female screw portion and the insertion hole 274. Sit down and sit down. The connection member 310 (see FIG. 31) to be screwed with the connection member having the female screw portion has a male screw portion on the outer peripheral surface. The male screw portion of the connection member 310 and the female screw portion of the connection member 270 are screwed together as described later.

  Next, a method for connecting the shielded electric wire and the housing according to the present embodiment will be described.

  First, the wire body 20 extending from the end of the shielded wire metal pipe 11 having the end structure shown in FIG. 32 is inserted into the insertion hole 274 of the shielded wire connecting portion 290 in the frame 261 shown in FIG. To do. FIG. 33 shows this insertion state.

  Next, as shown in FIG. 34, the tip of the enlarged diameter portion 320 formed at the end of the metal pipe 11 is brought into contact with the tip of the connecting member 270 in the shielded wire connecting portion 290. Thereafter, the female screw portion 312 formed on the inner peripheral surface 311 of the connection member 310 and the male screw portion 273 formed on the outer peripheral surface of the connection member 270 are screwed together. In the process of screwing the female screw portion 312 and the male screw portion 273 over a sufficient length, the connecting member 310 presses the washer 315 against the enlarged diameter portion 320. By this pressing, the washer 315 is plastically deformed, and the opening diameter of the washer 315 is gradually increased. As a result, the gap between the female screw portion 312 in the connection member 310 and the male screw portion 273 in the connection member 270 is sealed, and the electrical connection between the metal pipe 11 and the frame body 261 becomes more reliable.

  Thereafter, the conductor 17 of the electric wire body 20 inserted into the frame body 261 is screwed with a bolt 266 via a terminal block 265 and a washer 267 provided on the bottom 262 shown in FIG. Thereby, the wire body 20 of the shielded wire and the housing 260 are electrically connected. Finally, the housing cover 263 is placed on the upper surface of the frame body 261, and the frame body 261 and the housing cover 263 are screwed and fixed by the fastening means 264. Thereby, the connection between the shielded electric wire and the housing 260 is completed, and the shielded electric wire unit 340 is obtained.

  According to the connection method according to the present embodiment, the end of the metal pipe 11 and the shielded electric wire connecting part 290 are electrically connected by screwing the connecting member 310 and the connecting member 270 of the shielded electric wire connecting part 290 together. The That is, the grounding connection between the shield member of the shielded wire and the housing 260 can be performed outside the housing 260. Therefore, according to the connection method according to the present embodiment, the shield connector of the shielded electric wire 350 is installed in the frame 382 of the casing 381 like the connection of the conventional shielded electric wire 350 and the casing 381 shown in FIG. The complicated process of screwing 354 and the ground terminal block 387 with the bolt 390 becomes unnecessary. That is, the connection workability between the shielded electric wire and the housing 260 is simple and good.

  Before the shielded wire metal pipe 11 is connected to the shielded wire connecting portion 290 in the housing 260, the metal pipe 11 is preliminarily bent in a predetermined shape. For this reason, when connecting the shielded electric wire and the housing 260, specifically, when connecting the metal pipe 11 and the shielded electric wire connecting portion 290, there is no possibility that an excessive force is applied to the connecting portion.

  By mechanically connecting the metal pipe 11 and the housing 260, stress is less likely to remain in the connection portions (shielded wire connection portion 290 and connection member 310) as compared to the connection by welding. For this reason, the strength reduction of the metal pipe 11 can be suppressed.

  On the other hand, according to the shielded electric wire unit according to the present embodiment, the shielded electric wire and the casing 260 are mechanically and electrically connected in advance. For this reason, for example, when this shielded electric wire unit is used as a power supply unit (for example, a transmission side power supply unit of an automobile), it is easy to attach to a device to which power is supplied, and the handleability is excellent. That is, by allowing the entire frame of the housing 260 to function as a grounding member, the shield wire and housing ground connection process that has been conventionally performed by each manufacturer (for example, an automobile manufacturer) can be omitted. .

  Next, a modified example of the shielded electric wire according to the present embodiment will be described based on the attached drawings.

  In the cylindrical wire 50 shown in FIG. 5 in the shielded electric wire according to the present embodiment, the inner sleeve 21, the braided shield 12, and the outer sleeve 22 are separate members.

  On the other hand, the cylindrical body of this modification is an integral member of the inner sleeve and the outer sleeve that constitute the cylindrical body. Specifically, as shown in FIG. 21, an inner sleeve 211, an outer sleeve having an inner diameter larger than the outer diameter of the inner sleeve 211, and a ring-shaped connection that integrally connects the inner sleeve 211 and the outer sleeve. A sleeve member 210 having a portion 213 is prepared. For example, the connecting portion 213 is provided in the middle portion of the sleeve member 210 in the longitudinal direction (the left-right direction in FIG. 21). The position of the connecting portion 213 is not limited and may be the end portion of the sleeve member 210. The sleeve member 210 is integrally formed by casting or the like. The sleeve member 210 has two space portions 214 and 215 with the connecting portion 213 sandwiched between the inner sleeve 211 and the outer sleeve. The braided shield 12 is inserted into one space (space 214 in FIG. 21), and the metal pipe 11 is inserted into the other space (space 215 in FIG. 21) as described later.

  Next, the braided shield 12 is inserted into the space 214 of the sleeve member 210. The portion of the braided shield 12 inserted into the space 214 becomes the overlapping portion 222. Thereafter, as shown in FIG. 22, a cylindrical jig 221 is inserted into the internal space 216 of the sleeve member 210. Thereafter, compression is performed by applying pressure from the outside of the outer sleeve 212 by a pressing means (for example, a jig) in the overlapping portion 222, and the outer sleeve 212, the braided shield 12, and the inner sleeve 211 are mechanically joined. . By this mechanical joining, a contact area between the braided shield 12 and the outer sleeve 212 and the inner sleeve 211 is secured, and electrical contact is increased. The compression molding is performed over the entire circumference of the sleeve member 210.

  Next, as shown in FIG. 23, a part of the overlapped portion 222 that has been mechanically joined is partially melted and solidified, and the braided shield 12, the outer sleeve 212, and the inner sleeve 211 in the partially melted and solidified portion 231 are formed. Fully electrically joined. Thereby, the cylindrical body 230 is obtained. This partial melting and solidification is performed by applying heat from the outside of the outer sleeve 212 by a technique such as TIG welding, MIG welding, electron beam welding, or laser welding.

  Next, as shown in FIG. 24, the metal pipe 11 is inserted into the space 215 of the sleeve member 210. The portion of the metal pipe 11 inserted into the space portion 215 becomes the overlapping portion 242. At this time, the electric wire main body 20 inserted in advance in the metal pipe 11 is inserted into the cylindrical body 230.

  Next, the boundary portion 241 between the cylindrical body 230 and the metal pipe 11 is melt-bonded by MIG welding or the like to form a melt-bonded portion 251 as shown in FIG. This fusion bonding is continuously performed over the entire circumference of the cylindrical body 230. As a result, the metal pipe 11 and the sleeve member 210 in the cylindrical body 230 are reliably electrically connected at the melt joint portion 251.

  Finally, the sleeve member 210 is insulated. For example, heat-shrinkable tubes each having a length that completely covers the sleeve member 210 are prepared, and after covering the sleeve member 210, hot blow is performed so that the heat-shrinkable tube is shrunk to be in close contact with the shield member. Do.

  According to the shielded wire using the cylindrical body 230, the braided shield 12 and the sleeve member 210 are electrically joined by direct contact, and the sleeve member 210 and the metal pipe 11 are electrically joined by direct contact. . That is, the braided shield 12 and the metal pipe 11 are indirectly electrically connected via the sleeve member 210. Here, since the braided shield 12 has a net-like porous structure, if spot welding is performed in a state where the braided shield 12 and the metal pipe 11 are in direct contact, the electrical contact at the welded portion is not very good. However, in the shielded electric wire using the cylindrical body 230, the braided shield 12 and the sleeve member 210, and the sleeve member 210 and the metal pipe 11 are electrically joined in a planar shape over a wide range. For this reason, by electrically connecting the braided shield 12 and the metal pipe 11 indirectly via the sleeve member 210, the electrical connection becomes more reliable.

  As described above, the present invention is not limited to the above-described embodiment, and it goes without saying that various other things are assumed.

1 is a plan view of a shielded electric wire according to a preferred embodiment of the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. It is a top view of a cylinder. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is sectional drawing which shows the state before giving compression molding to a cylinder. It is sectional drawing of the cylinder in compression molding. It is a top view of the cylinder after performing compression molding. FIG. 10 is a sectional view taken along line 10-10 in FIG. 9; It is a top view at the time of making the electric wire main body penetrate the metal pipe. It is a top view at the time of butting | matching the cylinder of FIG. 9 and the metal pipe of FIG. It is a top view at the time of connecting a cylinder and a metal pipe. It is a top view at the time of welding a cylinder and a metal pipe. It is a top view which shows the 1st modification of FIG. It is a top view at the time of welding a cylinder and a metal pipe after the connection of FIG. It is a top view which shows the 2nd modification of FIG. It is a top view at the time of welding a cylinder and a metal pipe after the connection of FIG. It is a top view which shows the 3rd modification of FIG. It is a top view at the time of welding a cylinder and a metal pipe after the connection of FIG. It is sectional drawing which shows the 1st modification of the cylinder of FIG. It is sectional drawing at the time of performing a joining process to the cylinder of FIG. It is sectional drawing after giving an electrical joining process to the cylinder which performed the joining process. It is sectional drawing after connecting the cylinder and metal pipe of FIG. It is sectional drawing after welding a cylinder and a metal pipe. It is a partial fracture top view of a case concerning a suitable 1 embodiment of the present invention. It is a top view which shows the state which attaches a shield wire connection part to the frame of a housing | casing. It is a top view after attaching a shield wire connection part to a frame. It is a top view after welding a shield electric wire connection part and a frame. It is a principal part enlarged view of the shielded electric wire of FIG. It is a top view which shows the state which penetrated the connection member to the non-cylinder side of the metal pipe in a shield electric wire. FIG. 32 is a plan view of the shielded wire of FIG. 31 after the diameter expansion process is performed on the non-cylindrical side end of the metal pipe. It is a top view at the time of butting the frame which welded the shield electric wire and shielded electric wire connection part after giving a diameter expansion process. It is a top view after connecting a shield electric wire and a shield electric wire connection part with a connection member. It is a top view of the conventional shielded electric wire. FIG. 36 is a cross-sectional view taken along line 36-36 in FIG. 35. It is the 37-37 sectional view taken on the line of FIG. It is a top view of the conventional shielded electric wire unit.

Explanation of symbols

11 Metal pipe 12 Braided shield (cylinder)
15 Insulator 17 Conductor 20 Electric Wire Body 21 Inner Sleeve (Cylinder)
22 Outer sleeve (cylinder)
50 cylinder 310 connecting member

Claims (11)

In a shielded electric wire provided with a wire body formed by coating a conductor made of a single wire or a stranded wire with an insulator, and a shield member provided on the outer periphery of the wire body,
The shield member is composed of a cylindrical body in which a braided shield and an outer sleeve are sequentially provided around the inner sleeve, and a metal pipe provided to face the cylindrical body, and the outer sleeve is provided at one end side of the cylindrical body. One end of the metal pipe and one end of the metal pipe are electrically connected by fusion bonding , and a tubular connection member is fitted on the outer periphery of the other end of the metal pipe.   The shielded electric wire according to claim 1, wherein a cone-shaped enlarged diameter portion is provided at the other end of the metal pipe.   The shielded electric wire according to claim 1 or 2, wherein the connecting member is a nut member having a female screw portion on an inner peripheral portion thereof.   The shielded electric wire according to claim 1 or 2, wherein the connecting member has a male screw portion on an outer peripheral portion thereof.   The shielded electric wire according to any one of claims 1 to 4, wherein the metal pipe and the connecting member are made of aluminum or an aluminum alloy. In the method of connecting a shielded wire and a housing, the shielded wire includes a wire body formed by coating a conductor made of a single wire or a stranded wire with an insulator, and a shield member provided on the outer periphery of the wire body, The shield member is composed of a cylindrical body in which a braided shield and an outer sleeve are sequentially provided around the inner sleeve, and a metal pipe provided in abutment with the cylindrical body. Two projecting shielded wire connecting portions, the shielded wire connecting portion having a wire main body insertion hole at the center thereof, one end of the outer sleeve and one end of the metal pipe at one end side of the cylindrical body preparative a step of electrically connecting by melt bonding, the steps of inlaid tubular connection member and the outer circumferential other end side of the metal pipe, the other end of the metal pipe A method of connecting a shielded electric wire and a housing, comprising: abutting an end part with the shielded electric wire connecting part; and mechanically connecting the connecting member and the shielded electric wire connecting part. .   The method of connecting a shielded electric wire and a housing according to claim 6, further comprising a step of expanding the diameter of the other end of the metal pipe in a cone shape after the fitting step.   The abutting step inserts the electric wire main body protruding from the other end of the metal pipe into the electric wire main body insertion hole of the shielded electric wire connecting portion, and the other end of the metal pipe is connected to the shielded electric wire. The method for connecting a shielded electric wire and a housing according to claim 6 or 7, wherein the method is to be seated on a connecting portion.   9. The mechanical connection step of screwing a female screw portion formed on an inner peripheral portion of the connecting member and a male screw portion formed on an outer peripheral surface of the shielded wire connecting portion. The connection method of the shielded electric wire and housing | casing of description. The mechanical connection step is for screwing a male screw portion formed on an outer peripheral portion of the connecting member and a female screw portion formed on an inner peripheral surface of an electric wire main body insertion hole of the shielded electric wire connecting portion. The connection method of the shielded electric wire and housing | casing of 6 or 7 . A shielded electric wire unit in which at least one shielded electric wire and a housing are connected, wherein the shielded electric wire has a conductor made of a single wire or a stranded wire covered with an insulator, and the electric wire main body A shield member provided on the outer periphery, and the shield member is configured by a cylindrical body provided with a braided shield and an outer sleeve sequentially around the inner sleeve, and a metal pipe provided in abutment with the cylindrical body, The case made of metal includes at least one convex shielded wire connecting portion, and the shielded wire connecting portion has a wire main body insertion hole at the center thereof, and at one end side of the cylindrical body the one end of the outer sleeve and the metal pipe and electrically connected by fusion bonding, an other end of the metal pipe and inlaid tubular connection member on the outer periphery thereof, the metal Pas The other end of the flop, butt to the shield wire connection portion, the shielded cable unit, characterized in that the mechanically connecting the connecting member and the shield wire connecting portion.

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