JP2006185927A - Conductive line provided with shield function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent interference by foreign matters from the outside without increasing the number of components. <P>SOLUTION: A cylindrical shield means 50 collectively surrounding a plurality of electric wires 30 is provided with a main shield part 51 composed of a metallic pipe. As the main shield part 51 is composed of the metallic pipe, not only does it exercise the shield function, but it can surely protect the electric wires from the interference of foreign matter. As the main shield part 51 is also functioned as a protecting means of the electric wires 30, the number of components can be reduced in comparison with the case that the protecting means is mounted independently from the shield means 50. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a conductive path having a shielding function.

  For example, when connecting devices such as an inverter device and a motor in an electric vehicle, a conductive path having a shield function is used. As this type of conductive path, the wire side terminal is fixed to the end of the conductor of the shielded wire, the wire side terminal is connected to the device side terminal provided in the shield case of the device, and the shield layer of the shielded wire Is connected to the shield case via a conductive connecting member (see, for example, Patent Document 1).

  However, in such a conductive path, the work of inserting the wire side terminal into the shield case and the work of connecting the connecting member to the shield case must be repeated as many times as the number of terminals (ie, the number of shielded wires). There is a problem that it takes time and effort.

Therefore, it is conceivable to use an electric wire that does not have a shield layer, and to cover the electric wire collectively with a flexible cylindrical shield member made of a braided wire knitted with a fine metal wire. According to this collective shield type conductive path, the work of connecting the shield function portion (shield member) to the shield case is performed only once regardless of the number of wires, so that workability is improved.
JP 11-26093 A

As described above, a conductive path in which a plurality of electric wires are surrounded by a shield member may be routed while being exposed to the outside of the vehicle body. In this case, the wires and shield members are made of metal for protection from stepping stones. Such a structure is adopted that it is housed in an outer case made of a material having high strength.
However, providing the exterior case separately from the conductive path not only increases the number of parts and the number of assembly steps, but also increases the cost.
The present invention has been made in view of the above circumstances, and an object thereof is to prevent foreign matter interference from outside without increasing the number of parts.

  As a means for achieving the above object, the invention of claim 1 is a conductive path routed in a vehicle, comprising a plurality of electric wires, and an electric wire side terminal fixed to a terminal portion of the electric wire, A device-side terminal provided in a shield case of the device, to which the wire-side terminal is connected, and bent along the routing route and fixed to the vehicle in the middle of the routing route, the plurality of wires It is characterized in that it is configured to have a shielding means including a metal pipe that surrounds all at once and is connected to the shield case.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the shield means is fixed to the vehicle by brackets at a plurality of locations in the middle of the routing route.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the most part of the shield means excluding the end portion has a circular cross section, and the end portion of the shield means is broadened to the left and right. It is characterized by its elliptical shape.

  According to a fourth aspect of the present invention, in the apparatus according to any one of the first to third aspects, the end of the shield means is connected so as to be conductive by contacting the outer surface of the shield case. Has characteristics.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, an attachment portion having a bolt hole is formed at an end portion of the shield means, and the attachment portion is formed on the shield case. It has a feature in that it is fixed by being in contact with the outer surface and screwed into the female screw hole of the shield case and tightened by a bolt inserted into the bolt hole.

  The invention of claim 6 is characterized in that, in any one of claims 1 to 4, the surface of the shield means is subjected to rust prevention plating.

  The invention according to claim 7 is the structure according to any one of claims 1 to 6, wherein the shield means is provided with a drain hole that opens substantially downward at the lowest point in the routing path. did.

<Invention of Claims 1-6>
Since the sealing means is provided with a metal pipe, it not only exhibits a shielding function but also can reliably protect foreign matter interference with the electric wire. Thus, since the shield means also serves as a protection means for the electric wire, the number of parts can be reduced as compared with the case where the protection means is provided separately from the shield means.

<Invention of Claim 7>
Since the water accumulated in the shield means can be discharged, problems such as corrosion due to the presence of moisture can be reliably prevented.

<First Embodiment>
A first embodiment embodying the present invention will be described below with reference to FIGS.

  The conductive path A having a shielding function of the present embodiment is used as a means for connecting the inverter device 10 (equipment that is a constituent element of the present invention) and the motor 20 (equipment that is a constituent element of the present invention) in an electric vehicle. .

  The inverter device 10 is provided in an engine room, and is configured by accommodating an inverter 12 and three device-side terminals 13 extended from the inverter 12 in a conductive shield case 11. The device side terminal 13 has a thick plate shape called a bus bar, and has a bolt hole 14 penetrating in the vertical direction. A side wall of the shield case 11 is formed with a horizontally long substantially elliptical attachment hole 15 corresponding to the three device side terminals 13, and a pair of female screws located on the left and right sides of the attachment hole 15. A hole 16 is formed.

  The motor 20 is provided on a wheel, and is configured by accommodating a coil (not shown) and a device-side terminal (not shown) connected to the coil in a conductive shield case 21. The device side terminal has a thick plate shape called a bus bar, like the device side terminal 13 of the inverter device 10, and has a bolt hole penetrating in the vertical direction. The side wall of the shield case 21 is formed with a horizontally long substantially elliptical attachment hole 25 corresponding to the three device side terminals, and a pair of female screw holes located on the left and right sides of the attachment hole 25. 26 is formed.

  Next, the conductive path A of this embodiment will be described.

  The conductive path A includes three electric wires 30, electric wire side terminals 40 fixed to both ends of each electric wire 30, and cylindrical shield means 50 that collectively surround the three electric wires 30. Has been.

  The electric wire 30 is formed by surrounding the outer periphery of the conductor 31 with an insulating coating 32. Unlike the shielded electric wire, the electric wire 30 is not provided with a shield layer.

  The electric wire side terminal 40 is made of a thick metal plate material, and the substantially first half portion is generally a flat plate shape and is a device connection portion 41 having a bolt hole 42 penetrating vertically, and the substantially latter half portion is an open barrel-like shape. An electric wire crimping portion 43 is formed. The conductor 31 of the electric wire 30 is connected to the electric wire crimping portion 43 so as to be conductive by crimping.

  The shield means 50 is long and has a main shield portion 51 having a length substantially covering the entire length of the conductive material, and a sub shield that is shorter than the main shield portion 51 and constitutes an end portion of the conductive path A on the inverter device 10 side. Part 53.

  The main shield 51 is made of a metal pipe (for example, iron, aluminum, copper, and stainless steel) and has an inner diameter that allows the three wires 30 to be inserted. The main shield part 51 is bent along the routing path of the conductive path A. That is, a portion of the main shield portion 51 in the vicinity of the motor 20 is a long horizontal portion 51a that extends substantially in the horizontal direction, and a portion of the long horizontal portion 51a is low. This lowered portion is the lowest lowest portion 51b in the routing path of the conductive path A, and a drain hole 52 that opens to the lower surface side is formed in the lowest portion 51b. A rising portion 51c extends upward from an end portion of the long horizontal portion 51a of the main shield portion 51 opposite to the motor 20, and a short horizontal portion 51d is connected to the inverter device 10 from an upper end portion of the rising portion 51c. It extends almost horizontally toward Further, the end portion of the long horizontal portion 51a on the motor 20 side is a substantially elliptical portion 51e that is tapered in the left-right direction. A pair of attachment portions 51f projecting in the left-right direction is formed at the opening edge of the substantially elliptical portion 51e, and a bolt hole 51g is formed in each attachment portion 51f. On the other hand, the end of the short horizontal portion 51d on the inverter device 10 side is circular.

  The sub-shield part 53 includes a tubular braided member 54, a connection pipe 55, and a shield shell 56.

  The tubular braided member 54 is obtained by braiding conductive fine metal wires (for example, copper) in a mesh shape, and one end (on the main shield part 51 side) is connected to the three electric wires 30 and the electric wires 30. A small-diameter portion 54a having a diameter necessary for inserting the connected electric wire side terminal 40 is formed, and the other end portion (on the inverter device 10 side) has three electric wire side terminals 40 spaced laterally. The large-diameter portion 54b has a substantially elliptical shape that can be accommodated in a lined state.

  The connection pipe 55 is made of metal (for example, iron, aluminum, copper, and stainless steel), and has a cylindrical shape that is substantially the same size as the short horizontal portion 51 d of the main shield portion 51. The connecting pipe 55 has a length necessary and sufficient for connecting the tubular braided member 54 and the main shield part 51, and the length dimension thereof is significantly shorter than that of the main shield part 51.

  The shield shell 56 is an integral part formed by deep drawing a metal plate material (for example, iron or copper), and has a cylindrical portion 57 that is a horizontally long and substantially elliptical shape, and a front edge of the cylindrical portion 57. It has a plate-like mounting portion 58 that projects from the left and right end portions (on the edge on the inverter device 10 side) to the left and right outer sides, and a bolt hole 59 is formed in the mounting portion 58. The front surface of the mounting portion 58 is in contact with the outer wall surface of the shield case 11 so as to come into contact with the outer wall surface.

  Further, the rear end of the connection pipe 55 (the end opposite to the inverter device 10) is connected to the main shield part 51. That is, the rear end surface of the connection pipe 55 is abutted against the front end surface of the short horizontal portion 51 d of the main shield portion 51, and the abutting portion is fixed by the welding M so as to be conductive. In the fixed state, the connecting pipe 55 and the short horizontal portion 51d are substantially coaxially continuous.

  The end portion of the inverter device 10 of the connecting pipe 55 is covered with a small-diameter portion 54a of the tubular braided member 54, and a caulking ring 60 is fitted from the outside, and the caulking ring 60 is caulked to thereby form a tubular braid. The small-diameter portion 54a of the member 54 is fixed to the front end portion (end portion on the inverter device 10 side) of the connection pipe 55 so as to be conductive. Further, a tin plating process (not shown) is applied to the outer peripheral surface of the connection pipe 55, that is, the surface in contact with the cylindrical braided member 54, and the connection pipe 55 and the cylinder are processed by the tin plating process. The contact resistance with the braided member 54 is reduced. In the present embodiment, the surface of the main shield part 51 to which the tubular braided member 54 does not directly contact is not subjected to a plating process for reducing the contact resistance, but rust-proof plating (for example, the main shield part 51). In the case where is made of iron, the surface thereof may be galvanized).

  The large-diameter portion 54b of the tubular braided member 54 is put on the tubular portion 57 of the shield shell 56, and a caulking ring 61 is fitted from the outside, and the caulking ring is caulked to thereby increase the large diameter of the tubular braided member 54. The portion is fixed to the cylindrical portion 57 of the shield shell 56 so as to be conductive.

  When connecting the conductive path A to the inverter device 10, first, the three electrical terminals 40 are inserted into the mounting holes 15 of the shield case 11, and the device connection part 41 is placed on the device side terminal 13. By screwing and tightening a nut 63 to a bolt 62 penetrating the holes 14 and 42, both terminals 13 and 40 are connected so as to be conductive. Thereafter, the shield shell 56 is brought into contact with the outer surface of the shield case 11, and a bolt (not shown) inserted into the bolt hole 59 of the shield shell 56 is screwed into the female screw hole 16 of the shield case 11 and tightened. The shield shell 56 is fixed to the shield case 11 so as to be conductive.

  On the other hand, the connection between the conductive path A and the motor 20 is similarly performed in the case of the inverter device 10 although illustration is omitted. That is, three electric wire side terminals (not shown) protruding from the substantially elliptical portion 51e which is the end of the long horizontal portion 51a are inserted into the mounting holes 25 of the shield case 21, and the device connecting portion is connected to the device side terminal. The terminal is placed on (not shown) and both terminals are connected to each other by a bolt and a nut so as to be conductive. Thereafter, the substantially oval part 51e and the attachment part 51f of the main shield part 51 are brought into contact with the outer surface of the shield case 11, and a bolt (not shown) inserted into the bolt hole 51g of the attachment part 51f is used as the female screw of the shield case 21. The main shield part 51 is fixed to the shield case 21 so as to be conductive by being screwed into the hole 26 and tightened. The main shield part 51 is fixed to a vehicle body (not shown) by a bracket or the like at a plurality of locations along the wiring path of the conductive path A.

  As described above, in the conductive path A of the present embodiment, the shield means 50 that collectively surrounds the three electric wires 30 is shorter than the main shield part 51 made of a metal pipe and the main shield part 51. The sub-shield part 53 is made deformable by using the tubular braided member 54 and has the following effects.

  Since the main shield part 51 is made of a metal pipe, not only can the shield function be exhibited, but also the interference of foreign matter with the electric wire 30 can be reliably protected. Thus, since the main shield part 51 which constitutes most of the shield means 50 also serves as a means for protecting the electric wire 30, the number of parts can be reduced as compared with the case where the protection means is provided separately from the shield means 50. .

  Moreover, since the main shield part 51 consists of metal pipes, if both ends thereof are directly fixed to the shield cases 11 and 21, there is a concern that stress due to vibration or the like is generated in the fixed parts. However, since the sub-shield part 53 has flexibility, it can absorb vibrations, thereby avoiding the generation of stress at the fixing part to the shield case 11.

  Further, the sub-shield part 53 includes a tubular braided member 54, but the tubular braided member 54 is formed by braiding a thin metal wire, so that it can be flexibly deformed. Therefore, it is possible to cope with the case where the electric wire 30 is bent with a large curvature in the vicinity of the device.

  Further, although the metal thin wire is likely to fray at the end of the tubular braided member 54, the end of the tubular braided member 54 is in a state before the tubular braided member 54 is connected to the main shield part 51 and the shield case 11. Since the portion is fixed to the connecting pipe 55 and the shield shell 56, fraying of the fine metal wire at the end portion is prevented.

  Further, since the tubular braided member 54 is made of a thin metal wire, the contact area with the connecting pipe 55 is reduced, and there is a concern that the reliability of both the members 54 and 55 may be reduced. However, in this embodiment, since the connection pipe 55 is subjected to the plating process for reducing the contact resistance with the cylindrical braided member 54, the connection pipe 55 has high contact reliability.

  In addition, the plating process is performed only with the connecting pipe 55 that contacts the tubular braided member 54, and the plating process is not required for the long main shield part 51, so that the cost is kept low.

  In addition, the main shield 51 of the shield means 50 is provided with a drain hole 52 that opens downward at the lowest point in the routing path, so that the water accumulated inside the shield means 50 is discharged. Thus, problems such as corrosion due to the presence of moisture are reliably prevented.

[Other Embodiments]
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the flexible shield part is provided between the shield case and the main shield part. However, according to the present invention, the flexible shield part is interposed between the two main shield parts. May be.
(2) In the above-described embodiment, the flexible shield part is configured by a braided wire. However, according to the present invention, a metal pipe that is formed into a bellows shape and can be expanded and contracted may be used as the flexible shield part. .
(3) In the above embodiment, the pipe of the main shield part and the connecting pipe are welded in a form in which both end faces are brought into contact with each other. However, according to the present invention, one pipe is externally fitted to the other pipe. You may make it weld.
(4) In the above embodiment, the sub shield part is connected to the inverter device. However, according to the present invention, the sub shield part can also be connected to the motor.
(5) In the above embodiment, most of the region except for the end portion of the main shield portion has a circular cross section. However, according to the present invention, the main shield portion may have an elliptical shape, an oval shape, a rectangular shape, or the like.
(6) In the above embodiment, the connecting pipe has a circular cross section. However, according to the present invention, the connecting pipe may have an elliptical shape, an oval shape, a rectangular shape, or the like.
(7) In the above embodiment, the tubular braided member is connected to the main shield part via the connection pipe. However, according to the present invention, the tubular braided member may be directly connected to the main shield part.
(8) Although the case where the conductive path is used as a means for connecting the inverter device of the electric vehicle and the motor has been described in the above embodiment, the present invention also applies to a conductive path routed between other devices. Can be applied.

The schematic side view of the state which wired the electrically conductive path in Embodiment 1 between apparatuses Horizontal sectional view showing the process of connecting the conductive path to the inverter device Longitudinal sectional view showing the state where the conductive path is connected to the inverter device Perspective view of the terminal portion of the conductive path on the inverter device side Perspective view showing the motor side end of the conductive path

Explanation of symbols

A ... Conductive path 10 ... Inverter device (equipment)
11, 21 ... Shield case 13 ... Equipment side terminal 20 ... Motor (equipment)
30 ... Electric wire 40 ... Electric wire side terminal 50 ... Shielding means 52 ... Drain hole

Claims (7)

A conductive path routed in a vehicle,
Multiple wires,
A wire side terminal fixed to a terminal portion of the wire;
A device-side terminal provided in a shield case of the device to which the wire-side terminal is connected;
Shielding means comprising a metal pipe that is bent along the routing path and fixed to the vehicle in the middle of the routing path, surrounds the plurality of electric wires at once, and is connected to the shield case A conductive path having a shielding function. 2. The conductive path having a shield function according to claim 1, wherein the shield means is fixed to the vehicle by brackets at a plurality of locations in the middle of the routing path. The majority of the area except the end of the shield means has a circular cross section,
The conductive path having a shield function according to claim 1 or 2, wherein an end of the shield means has a substantially elliptical shape extending to the left and right. The conductive path having a shield function according to any one of claims 1 to 3, wherein an end portion of the shield means is connected so as to be conductive by contacting an outer surface of the shield case. . An attachment portion having a bolt hole is formed at the end of the shield means,
2. The fixing portion according to claim 1, wherein the mounting portion abuts on an outer surface of the shield case and is fixed by screwing and tightening a bolt inserted into the bolt hole into a female screw hole of the shield case. A conductive path having a shielding function according to claim 4. 6. A conductive path having a shield function according to claim 1, wherein a surface of the shield means is rust-proof plated. 7. The shield function according to claim 1, wherein the shield means is provided with a drain hole that opens downward at the lowest point in the routing path. Conductive path.

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