Power distribution lines

Abstract

To provide a power wiring path capable of easily performing waterproof processing between a power cable and a power cable termination connection part.SOLUTION: A power wiring path 8 comprises a power cable 1, a power cable termination connection part 2, and a shrinkable tube 6. The power cable 1 includes a central conductor 11, an insulation layer 12, a shield layer 13 consisting of a plurality of shield wires 131 and a sheath 14 and is stripped stepwise in such a manner that the central conductor 11 and the insulation layer 12 are exposed from the sheath 14 and the shield layer 13. The power cable termination connection part 2 includes: a cable holder 3 including an insertion hole 20 in which the central conductor 11 and the insulation layer 12 are inserted; and a tubular member 4 which is fixed to an end of the cable holder 3 and in which the sheath 14 is stored. The shrinkable tube 6 covers an outer peripheral surface 14a of the sheath 14 exposed from the tubular member 4, is adhered to an outer peripheral surface 422a of the tubular member 4 and forms a waterproof structure which prevents infiltration of water from a gap between the tubular member 4 and the sheath 14.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to power distribution lines used, for example, in railway vehicles. [Background technology]

[0002] Conventionally, a power cable for transmitting electric power in, for example, a railway vehicle has a central conductor, an insulating layer covering the outer periphery of the central conductor, a shielding layer consisting of a plurality of shield wires arranged to surround the outer periphery of the insulating layer, and a sheath covering the outer periphery of the shielding layer. At the termination of the power cable, a step stripping process is performed so that the central conductor and the insulating layer are exposed from the shielding layer and the sheath, and this step stripped termination of the power cable is connected to a termination connection part using an insulator made of a polymer-based material.

[0003] The polymer joint for power cables described in Patent Document 1 includes a polymer porcelain bushing with a cable insertion hole into which the end of a stepped stripped power cable is inserted, a protective metal fitting that protects the rear end of the polymer porcelain bushing, and a waterproofing treatment that seals the gap between the protective metal fitting and the power cable. The waterproofing treatment is formed by wrapping a resin tape, such as polyethylene tape with an adhesive layer or epoxy tape, which has good water resistance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-116281 Summary of the Invention [Problem to be solved by the invention]

[0005] When forming a waterproofing treatment by wrapping resin tape around the power cable, as described in Patent Document 1, the resin tape must be wrapped around the outer circumference of the power cable by hand in multiple layers, which is a time-consuming task.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a power wiring path that allows easy waterproofing between a power cable and a power cable terminal connection portion. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention provides a power wiring line comprising: a power cable for transmitting electric power; a power cable termination connection part to which an end of the power cable is connected; and a shrink tube arranged on the outer periphery of the power cable, wherein the power cable has a center conductor, an insulating layer covering the outer periphery of the center conductor, a shielding layer made of a plurality of shield wires arranged to surround the outer periphery of the insulating layer, and a sheath covering the outer periphery of the shielding layer, and is stepped stripped at the end so that the center conductor and the insulating layer are exposed from the sheath and the shielding layer, and the power cable termination connection part has a cable holder provided with insertion holes into which the center conductor and the insulating layer exposed from the sheath are inserted, and a metal tubular member fixed to the end of the cable holder and accommodating the sheath, wherein the shrink tube covers the outer periphery of the sheath exposed from the tubular member and is in close contact with the outer periphery of the tubular member, forming a waterproof structure that prevents water from entering through a gap between the tubular member and the sheath. [Effects of the Invention]

[0008] According to the present invention, it is possible to easily perform waterproofing between a power cable and a power cable termination connection portion in a power wiring path. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a configuration diagram showing a power wiring path according to an embodiment of the present invention; [Figure 2] 4 is a cross-sectional view showing a power cable termination connection portion on the first railway vehicle side, together with the power cable and one end of the shrink tube. FIG. [Figure 3] 3 is a cross-sectional view of the power cable and the shrinkable tube taken along line AA in FIG. 2. [Figure 4]1(a) is a perspective view showing a tubular member of a power cable, and FIG. 1(b) is a perspective cross-sectional view of the tubular member at line BB in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Embodiment Mode] An electric power distribution line according to an embodiment of the present invention will be described with reference to Figures 1 to 4. Figure 1 is a configuration diagram showing an electric power distribution line for a railway vehicle according to an embodiment of the present invention.

[0011] This power distribution line 8 relays power between first and second railway cars 91, 92 connected by a coupler (not shown), and includes a power cable 1, a pair of power cable terminal connections 2, 2 connected to one end and the other end of the power cable 1, and a shrinkable tube 6 covering the outer periphery of the power cable 1 between these power cable terminal connections 2, 2. For convenience, FIG. 1 shows the power cable 1 inside a portion of the shrinkable tube 6 broken away. The power cable 1 is a crossover cable that is suspended between the first and second railway cars 91, 92.

[0012] The power cable connection terminals 2, 2 are installed on the roofs of the first and second railway cars 91, 92. A first exterior cover 912 is attached to the roof 911 of the first railway car 91. The power cable connection terminal 2 on the first railway car 91 side is disposed inside the first exterior cover 912, and the power cable 1 and the shrink tube 6 are inserted into an insertion hole 912a provided in the first exterior cover 912.

[0013] Similarly, a second exterior cover 922 is attached to the roof 921 of the second railway car 92, and the power cable termination connection part 2 on the second railway car 92 side is disposed inside the second exterior cover 922, and the power cable 1 and shrink tube 6 are inserted into an insertion hole 922a provided in the second exterior cover 922. Between the first exterior cover 912 and the second exterior cover 922, the power cable 1 is entirely covered with the shrink tube 6.

[0014] Fig. 2 is a cross-sectional view showing the power cable connection terminal 2 on the first railway vehicle 91 side, together with the power cable 1 and one end of the shrinkable tube 6. Fig. 3 is a cross-sectional view of the power cable 1 and the shrinkable tube 6 taken along line AA in Fig. 2. Although not shown, the power cable connection terminal 2 on the second railway vehicle 92 side is configured in the same manner.

[0015] The power cable 1 transmits electric power to an object to be supplied with electric power, and as shown in Fig. 3, has a central conductor 11 formed by twisting together a plurality of wires 111, an insulating layer 12 covering the outer periphery of the central conductor 11, a shielding layer 13 made up of a plurality of shield wires 131 arranged to surround the outer periphery of the insulating layer 12, and a sheath 14 covering the outer periphery of the shielding layer 13. In this embodiment, an inner semiconductive layer 15 is provided between the central conductor 11 and the insulating layer 12, and an outer semiconductive layer 16 is provided between the insulating layer 12 and the shielding layer 13. A pressure wrapping tape 17 is spirally wound around the outer periphery of the shielding layer 13, and the outside of that is covered by the sheath 14.

[0016] The wires 111 of the central conductor 11 can be made of a wire material made of a highly conductive metal, such as a tin-plated annealed copper wire. The central conductor 11 transmits a high voltage of, for example, 7000 V or more. The insulating layer 12 is formed by extrusion molding a material such as ethylene propylene rubber, vinyl chloride, cross-linked polyethylene, silicone rubber, or a fluorine-based material. The sheath 14 is formed by extrusion molding a rubber, such as natural rubber, butyl rubber, halogenated butyl rubber, or non-halogenated polyolefin elastomer, to which a cross-linking agent or the like has been added. The shield wire 131 is made of a wire material, such as a tin-plated annealed copper wire, and is wound helically.

[0017] The inner and outer semiconductive layers 15, 16 are provided to reduce the concentration of electric fields and are mainly made of polymeric materials, which are formed by extrusion molding of conductive materials with conductive powder dispersed therein. The pressure wrapping tape 17 can be a strip made of, for example, plastic or rayon.

[0018] The power cable 1 is stripped in stages at the end connected to the power cable termination 2, exposing each layer in stages. Specifically, parts of the sheath 14 and the pressure wrapping tape 17 are removed to expose the multiple shield wires 131, parts of the outer semiconductive layer 16 are removed to expose the insulating layer 12, and parts of the insulating layer 12 and the inner semiconductive layer 15 are removed to expose the center conductor 11.

[0019] A compression terminal 10 is attached to the central conductor 11 exposed from the insulating layer 12. The compression terminal 10 has a cylindrical crimped portion 101 that is crimped to compress the central conductor 11, and a flat connecting portion 102 that is formed integrally with the crimped portion 101. An accommodating hole 101a that accommodates the central conductor 11 is formed in the crimped portion 101. An equipment connecting hole 102a is formed at the tip of the connecting portion 102.

[0020] The connection portion 102 of the compression terminal 10 is connected to the terminal 90 by a nut 100 inside the power cable termination 2. The terminal 90 has a tapered bushing 901 and a conductor 902 exposed from the bushing 901. A male thread 902a is formed at the tip of the conductor 902.

[0021] The power cable termination connection part 2 includes a cable holder 3 having an insertion hole 20 into which the central conductor 11 and insulating layer 12 of the power cable 1 exposed from the sheath 14 and shielding layer 13 are inserted, a metal tubular member 4 fixed to the end of the cable holder 3, an insulating plug 51 that connects the compression terminal 10 to the conductor 902 of the terminal 90, and a protective cap 52 that protects the insulating plug 51.

[0022] Insulating plug 51 includes a molded insulator 511, a high-voltage electrode 512 provided at one end of insulator 511, and a voltage detector electrode 513 provided at the other end of insulator 511. High-voltage electrode 512 is formed with a counterbore 512a corresponding to the shape of nut 100 and an internal thread 512b into which external thread 902a of conductor 902 screws. Voltage detector electrode 513 is formed with a tool fitting hole 513a into which the tip of a tool such as a socket wrench fits. Insulator 511 is molded integrally with high-voltage electrode 512 and voltage detector electrode 513.

[0023] Protective cap 52 is made of semiconductive rubber and is formed in a cylindrical shape with a bottom, integrally having a disk-shaped bottom wall 521 and a cylindrical side wall 522. Bottom wall 521 covers insulating plug 51. Side wall 522 has an annular protrusion 522a formed on its inner circumferential surface for fixing to cable holder 3.

[0024] The cable holder 3 has an insertion hole 20 formed in the center and includes a holding tubular portion 3A that holds the central conductor 11 and insulating layer 12 of the power cable 1, and a connecting tubular portion 3B that houses the connection portion between the compression terminal 10 and the conductor 902 of the terminal 90. In this embodiment, the axial direction of the connecting tubular portion 3B is perpendicular to the axial direction of the holding tubular portion 3A, and the cable holder 3 is formed into a T-shape. Hereinafter, in the axial direction of the holding tubular portion 3A (the left-right direction in FIG. 1), the side of the connecting tubular portion 3B will be referred to as the front end side, and the opposite side (the tubular member 4 side) will be referred to as the rear end side.

[0025] The cable holder 3 includes an insulator 30 made of a polymer material and first to third semi-conductors 31 to 33 made of a polymer material that has been made conductive by dispersing a conductivity-imparting agent. The insulator 30 is provided across the holding tubular portion 3A and the connecting tubular portion 3B, and is provided around the insertion hole 20 in the holding tubular portion 3A. The insulator 30 in the connecting tubular portion 3B is formed with a bushing insertion hole 301 into which a bushing 901 is inserted and an insulating plug insertion hole 302 into which an insulating plug 51 is inserted. The first to third semi-conductors 31 to 33 are formed integrally with the insulator 30 and mitigate the electric field around the power cable 1. The third semi-conductor 33 has a shielding function that prevents the electric field around the power cable 1 from leaking to the outside.

[0026] For example, silicone rubber, ethylene propylene rubber (EPM), ethylene propylene diene rubber (EPDM), etc. can be used as the polymer material of the insulator 30 and the first to third semi-conductors 31 to 33 in the cable holder 3. For example, conductive fine powder such as carbon black can be used as the conductivity imparting agent.

[0027] The first to third semi-conductors 31 to 33 are molded bodies that are injection-molded before forming the insulator 30. The first semi-conductor 31 surrounds the compression terminal 10 from the tip end of the cylindrical holding portion 3A to the cylindrical connecting portion 3B. The first semi-conductor 31 is formed with a terminal insertion hole 311 into which the compression terminal 10 is inserted together with a longitudinal portion of the center conductor 11 and the insulating layer 12, and an accommodating hole 312 that accommodates portions of the bushing 901 and the insulating plug 51. The second semi-conductor 32 is disposed closer to the rear end of the cylindrical holding portion 3A than the first semi-conductor 31.

[0028] The insertion hole 20 is formed by a small diameter hole portion 21 having an inner diameter corresponding to the outer diameter of the insulating layer 12 of the power cable 1, a large diameter hole portion 23 provided at the end portion on the rear end side, and a tapered hole portion 22 whose inner diameter gradually increases from the small diameter hole portion 21 toward the large diameter hole portion 23. A portion of the small diameter hole portion 21 on the front end side is formed by a first semi-conductor 31, and a portion of the rear end side is formed by a second semi-conductor 32. Between the first semi-conductor 31 and the second semi-conductor 32, the small diameter hole portion 21 is formed by an insulator 30.

[0029] The third semi-conductor 33 integrally includes a cylindrical portion 331 that covers the insulator 30 around the insertion hole 20 in a portion of the tip side of the holding cylindrical portion 3A including the outer periphery of the first semi-conductor 31, first and second protrusions 332, 333 that protrude radially outward from the outer circumferential surface 331a of the cylindrical portion 331, and an outer shell portion 334 that forms the outer shell of the connecting cylindrical portion 3B. The outer shell portion 334 is formed with an annular recess 334a that engages with a protrusion 522a formed on the side wall 522 of the protective cap 52.

[0030] An earth wire 71 is connected to the first protrusion 332. The earth wire 71 has an earth wire body 711 made of an insulated wire whose core wire is covered with an insulator, and an earth terminal 712 attached to the tip of the earth wire body 711. The earth terminal 712 is attached to the first protrusion 332 by a bolt 72 and a nut (not shown) that screws onto the bolt 72.

[0031] The tubular member 4 is fixed to the rear end of the cable holder 3, and allows the central conductor 11 and insulating layer 12 of the power cable 1 to pass through it, while also accommodating the shielding layer 13 and part of the sheath 14. The tubular member 4 is made of a highly conductive metal such as brass or an aluminum alloy. The multiple shield wires 131 of the shielding layer 13 are led out of the sheath 14 inside the tubular member 4, folded back around the outer periphery of the sheath 14, and led out of the tubular member 4 from between the outer periphery 14a of the sheath 14 and the inner periphery 4a of the tubular member 4.

[0032] Fig. 4(a) is a perspective view showing the tubular member 4. Fig. 4(b) is a perspective cross-sectional view of the tubular member 4 taken along line BB in Fig. 4(a). The tubular member 4 integrally comprises an embedded portion 41 embedded in the cable holder 3 and a cylindrical portion 42 exposed from the cable holder 3. The tubular member 4 is fixed to the cable holder 3 by embedding the embedded portion 41 in the insulator 30 of the cable holder 3.

[0033] Embedded portion 41 is cylindrical, and has through holes 410 formed at multiple locations (four locations in this embodiment) in the circumferential direction, penetrating embedded portion 41 in the axial direction. Insulator 30 fits into the multiple through holes 410. Embedded portion 41 is embedded in insulator 30 in a portion of tapered hole portion 22 of insertion hole 20 and in a portion that corresponds to the outer circumferential side of large diameter hole portion 23.

[0034] The embedded portion 41 and the cylindrical portion 42 are aligned in the axial direction along the longitudinal direction of the power cable 1 inside the tubular member 4. The cylindrical portion 42 further has a large diameter portion 421 and a small diameter portion 422 which have different outer diameters. The large diameter portion 421 is formed continuously with the embedded portion 41. The small diameter portion 422 has an outer diameter smaller than that of the large diameter portion 421, and is formed continuously with the end of the large diameter portion 421 on the opposite side to the embedded portion 41.

[0035] The outer circumferential surface 422a of the small diameter portion 422 of the tubular member 4 is covered almost entirely by the shrink tube 6. Note that it is sufficient that the shrink tube 6 covers a portion of the outer circumferential surface 422a on the opening side from which the sheath 14 is led out in the axial direction of the small diameter portion 422. In other words, it is sufficient that at least a portion of the outer circumferential surface 422a of the small diameter portion 422 in the axial direction is covered by the shrink tube 6.

[0036] The inner circumferential surface 4a of the tubular member 4 has a large-diameter inner circumferential surface 4b in which the multiple shield wires 131 and the sheath 14 are housed, a small-diameter inner circumferential surface 4c having an inner diameter smaller than that of the large-diameter inner circumferential surface 4b, and a tapered surface 4d having a partial conical shape between the large-diameter inner circumferential surface 4b and the small-diameter inner circumferential surface 4c. The central conductor 11 and the insulating layer 12 exposed from the sheath 14 are inserted inside the small-diameter inner circumferential surface 4c and the tapered surface 4d.

[0037] The embedded portion 41 is formed to have a smaller outer diameter than the large diameter portion 421 and the small diameter portion 422 of the cylindrical portion 42. The thickness T2 of the small diameter portion 422 is formed to be thinner than the thickness T1 of the large diameter portion 421 and the thickness T0 of the embedded portion 41. The outer peripheral surface 421a of the large diameter portion 421 is not covered by the insulator 30 of the cable holder 3 and is exposed to the outside. The insulator 30 of the cable holder 3 is in close contact with the outer peripheral surface 41a of the embedded portion 41 and the axial end face 421b of the large diameter portion 421 on the embedded portion 41 side.

[0038] Furthermore, the tubular member 4 has an earth wire connection portion 401 to which the earth wire 73 is connected, and shield wire connection portions 402 to which multiple shield wires 131 are connected, provided on the cylindrical portion 42. The earth wire connection portion 401 is provided in a portion that is not covered by the shrink tube 6, and the shield wire connection portions 402 are provided in a portion that is covered by the shrink tube 6. In this embodiment, the earth wire connection portion 401 is provided at one circumferential position on the large diameter portion 421, and the shield wire connection portions 402 are provided at multiple circumferential positions on the small diameter portion 422. The earth wire connection portion 401 is part of the large diameter portion 421, and the shield wire connection portions 402 are part of the small diameter portion 422.

[0039] 2, connection terminals 74 are attached to the tips of the multiple shield wires 131. In the present embodiment, the shielding layer 13 includes 20 shield wires 131, and ten of these shield wires 131 are electrically connected to the tubular member 4 by two connection terminals 74. That is, in the present embodiment, two shield wire connection portions 402 are provided on the tubular member 4, and these shield wire connection portions 402 are provided at positions 180° apart in the circumferential direction of the small diameter portion 422. The shrinkable tube 6 covers the 20 shield wires 131 extending from the tubular member 4 together with the two connection terminals 74.

[0040] The two connection terminals 74 are each connected to the shield wire connection portion 402 by a bolt 75. A threaded hole 402a into which the bolt 75 is threaded is formed in the shield wire connection portion 402. In this embodiment, the threaded hole 402a passes radially through the small diameter portion 422. However, the threaded hole 402a does not have to pass through the small diameter portion 422. The periphery of the opening of the threaded hole 402a on the outer circumferential surface 422a of the small diameter portion 422 is formed as a flat surface 402b perpendicular to the central axis of the threaded hole 402a so that the connection terminals 74 are reliably connected by tightening the bolt 75.

[0041] The earth wire 73 has an earth wire body 731 made of an insulated wire whose core is covered with an insulator, and an earth terminal 732 attached to the tip of the earth wire body 731. The earth wire connection part 401 has a threaded hole 401a into which a bolt 76 for connecting the earth terminal 732 is threaded, the threaded hole 401a opening in the outer circumferential surface 421a of the large diameter part 421 of the tubular member 4 so as not to penetrate the tubular member 4. The periphery of the opening of the threaded hole 401a in the outer circumferential surface 421a of the large diameter part 421 forms a flat surface 401b perpendicular to the central axis of the threaded hole 401a to ensure reliable connection of the earth terminal 732 by tightening the bolt 76.

[0042] The shrinkable tube 6 is a heat-shrinkable tube that shrinks radially when heated, and includes a tubular base layer 61 and an adhesive layer 62 provided on the inside of the base layer 61. The base layer 61 is made of a resin material that shrinks when heated, such as polyolefin or fluoropolymer. The adhesive layer 62 is made of a hot-melt adhesive, more specifically, a polyolefin such as polyethylene, a thermoplastic polyester, an ethylene-vinyl acetate copolymer, or a polyamide.

[0043] The shrinkable tube 6 covers the outer peripheral surface 14a of the sheath 14 exposed from the tubular member 4 and is in close contact with the outer peripheral surface 422a of the small diameter portion 422 of the tubular member 4, forming a waterproof structure that prevents water from entering through the gap between the tubular member 4 and the sheath 14. As shown in FIG. 1 , the shrinkable tube 6 also covers the entire power cable 1 between the power cable terminal connection part 2 connected to one end of the power cable 1 and the power cable terminal connection part 2 connected to the other end of the power cable 1.

[0044] In this embodiment, the shrink tube 6 is shrunk by heating over the entire longitudinal direction, but this is not limiting, and for example, the shrink tube 6 does not have to be shrunk between the first outer cover 912 and the second outer cover 922, which is not related to the waterproofing of the power cable connection termination 2. Furthermore, the adhesive layer 62 does not have to be provided inside the base material layer 61 in the portion not related to waterproofing.

[0045] (Actions and Effects of the Embodiments) According to the embodiment described above, the following actions and effects can be obtained.

[0046] (1) The shrinkable tube 6 covers the outer surface 14a of the sheath 14 exposed from the tubular member 4 and is in close contact with the outer surface 422a of the small diameter portion 422 of the tubular member 4, forming a waterproof structure that prevents water from entering through the gap between the tubular member 4 and the sheath 14. This eliminates the need to wrap a resin tape around the sheath 14 as described in Patent Document 1, for example, and makes it possible to easily waterproof the area between the power cable 1 and the power cable termination connection part 2.

[0047] (2) Since the earth wire connection portion 401 is provided in a location that is not covered by the shrink tube 6, the earth wire 73 can be easily connected, and even if the earth wire 73 is broken, the earth wire 73 can be quickly replaced.

[0048] (3) In the tubular member 4, the ground wire connection portion 401 to which the ground wire 73 is connected is provided in the large diameter portion 421, and multiple shield wire connection portions 402 are provided in the small diameter portion 422. This allows the outer diameter of the shrinkable tube 6 at the outer periphery of the small diameter portion 422 to be reduced, and also ensures sufficient current capacity in the large diameter portion 421, where a relatively large current is likely to occur. Furthermore, the thread depth of the screw hole 401a in the ground wire connection portion 401 can be increased, allowing the ground terminal 732 to be firmly connected by the bolt 76. Furthermore, by forming the screw hole 401a so as not to penetrate the tubular member 4, waterproofing can be improved.

[0049] (4) The multiple shield wires 131 are led out from the sheath 14 inside the tubular member 4, folded back at the end of the sheath 14, and led out to the outside of the tubular member 4. This makes it possible to easily wire the shield wires 131 while making the tubular member 4 small and lightweight.

[0050] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiments will be described by using the reference numerals and the like in the embodiments. However, the reference numerals in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0051] [1] A power cable (1) for transmitting electric power, a power cable termination (2) to which an end of the power cable (1) is connected, and a shrinkable tube (6) arranged on the outer periphery of the power cable (1), wherein the power cable (1) has a central conductor (11), an insulating layer (12) covering the outer periphery of the central conductor (11), a shielding layer (13) consisting of a plurality of shield wires (131) arranged to surround the outer periphery of the insulating layer (12), and a sheath (14) covering the outer periphery of the shielding layer (13), and is stepped at the end so that the central conductor (11) and the insulating layer (12) are exposed from the sheath (14) and the shielding layer (13). The power cable termination (2) has a cable holder (3) having an insertion hole (20) into which the central conductor (11) and the insulating layer (12) exposed from the sheath (14) are inserted, and a metal tubular member (4) fixed to the end of the cable holder (3) and accommodating the sheath (14), and the shrinkable tube (6) covers an outer peripheral surface (14a) of the sheath (14) exposed from the tubular member (4) and is in close contact with an outer peripheral surface (422a) of the tubular member (4), forming a waterproof structure that prevents water from entering through a gap between the tubular member (4) and the sheath (14).

[0052] [2] The power wiring path (8) according to the above item [1], wherein the plurality of shield wires (131) are led out from the sheath (14) inside the tubular member (4), the tubular member (4) is provided with shield wire connection portions (402) to which the plurality of shield wires (131) are connected, and an earth wire connection portion (401) to which an earth wire is connected, the shield wire connection portion (402) being provided in a portion covered by the shrink tube (6), and the earth wire connection portion (401) being provided in a portion not covered by the shrink tube (6).

[0053] [3] The power wiring path (8) according to the above [2], wherein the tubular member (4) integrally comprises an embedded portion (41) embedded in the cable holder (3), a large diameter portion (421) formed continuous with the embedded portion (41), and a small diameter portion (422) having an outer diameter smaller than that of the large diameter portion (421), and the earth wire connection portion (401) is provided in the large diameter portion (421), and a plurality of the shield wire connection portions (131) are provided in the small diameter portion (422).

[0054] [4] The power wiring path (8) described in [2] or [3] above, wherein the plurality of shield wires (131) are led out from between the outer peripheral surface (14a) of the sheath (14) and the inner peripheral surface (4a) of the tubular member (4) to the outside of the tubular member (4).

[0055] [5] The power wiring path (8) according to the above [4], wherein terminals (75) are attached to the tip ends of the plurality of shielded wires (131), the shrinkable tube (6) covers the plurality of shielded wires (131) led out from the tubular member (4) together with the terminals (75), and the shielded wire connection portion (402) is formed with a screw hole (402a) into which a bolt (76) for connecting the terminals (75) is threaded.

[0056] [6] The power wiring path (8) according to any one of [1] to [5] above, wherein both ends of the power cable (1) are connected to the power cable termination connection parts (2), and the shrinkable tube (6) covers the entire power cable (1) between the power cable termination connection part (2) connected to one end of the power cable (1) and the power cable termination connection part (2) connected to the other end of the power cable (1).

[0057] Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the embodiments described above. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. [Explanation of symbols]

[0058] 1...Power cable 11...Center conductor 12...insulating layer 13...shielding layer 131...Shield wire 14...Sheath 2...Power cable terminal connection part 20...Socket hole 3... Cable holder 4... Tubular member 401...Ground wire connection part 401a...Screw hole 402...Shield wire connection part 402a...Screw hole 41...Embedded portion 421...Large diameter portion 422...Small diameter part 4a...Inner peripheral surface 6... Shrink tube 73... Ground wire 75...Connection terminal 76...Volt 8…Power wiring path

Claims

1. a power cable that transmits electric power; a power cable terminal connection part to which an end of the power cable is connected; and a shrink tube that is disposed around the outer periphery of the power cable; the power cable has a central conductor, an insulating layer covering the outer periphery of the central conductor, a shielding layer made of a plurality of shield wires arranged so as to surround the outer periphery of the insulating layer, and a sheath covering the outer periphery of the shielding layer, and is stepped at the end portion so that the central conductor and the insulating layer are exposed from the sheath and the shielding layer; the power cable termination connection portion includes a cable holder having an insertion hole into which the central conductor and the insulating layer exposed from the sheath are inserted, and a metal tubular member fixed to an end of the cable holder and accommodating the sheath, the shrinkable tube covers an outer peripheral surface of the sheath exposed from the tubular member and is in close contact with the outer peripheral surface of the tubular member, forming a waterproof structure that prevents water from entering through a gap between the tubular member and the sheath, the plurality of shield wires are led out from the sheath inside the tubular member, the tubular member is provided with a shield wire connection portion to which the plurality of shield wires are connected and a ground wire connection portion to which a ground wire is connected, the shield wire connection portion is provided in a portion covered by the shrink tube, The earth wire connection portion is provided in a portion not covered by the shrinkable tube. Power wiring path.

2. the tubular member integrally includes an embedded portion embedded in the cable holder, a large diameter portion formed continuous with the embedded portion, and a small diameter portion having an outer diameter smaller than that of the large diameter portion, The large diameter portion is provided with the earth wire connection portion, a plurality of the shield wire connection portions are provided on the small diameter portion; The power distribution line of claim 1 .

3. the plurality of shield wires are led out from between the outer peripheral surface of the sheath and the inner peripheral surface of the tubular member to the outside of the tubular member; 3. The power wiring path according to claim 1 or 2.

4. Terminals are attached to the tip ends of the plurality of shield wires, the shrinkable tube covers the plurality of shield wires extending from the tubular member together with the terminals; The shield wire connection portion has a screw hole into which a bolt for connecting the terminal is screwed. The power distribution line of claim 3 .

5. Both ends of the power cable are connected to the power cable termination connection parts, the shrinkable tube covers the entire power cable between the power cable termination connection part connected to one end of the power cable and the power cable termination connection part connected to the other end of the power cable.

5. The power distribution line according to claim 1.

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