JP2007008423A - Shield conductive body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield conductive body capable of enhancing the heat radiation property. <P>SOLUTION: A pipe 22 has an air inlet 27 opened continuous to an in-cabin space R of an electric vehicle EV, and an air outlet 28 opened continuous to a ventilation space S. An air flow from the air inlet 27 to the air outlet 28 occurs in the pipe 22. In addition, the pipe 22 is arranged in an exposed manner to a part at which air flows as the electric vehicle EV travels. An outer surface of the pipe 22 is cooled by the air in addition to the outside air passing through the pipe, and the heat radiation property of a shield conductive body 1 is reliably enhanced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shield conductor.

For example, what is described in Patent Document 1 is known as a shield conductor used as a power circuit of an electric vehicle. This shield conductor has a structure in which a plurality of non-shielded electric wires are collectively shielded by being surrounded by a shield member made of a cylindrical braided wire obtained by knitting metal fine wires in a mesh shape. As a method for protecting the shield member and the electric wire in this type of shield conductor, generally, a means for surrounding the shield member with a protector made of synthetic resin is taken.
JP 2004-178913 A

  However, if the electric wire and the shield member are surrounded by the protector, heat generated from the electric wire during energization tends to be trapped in the protector, and the heat dissipation of the shield conductor may be reduced. Then, since the allowable current value of the electric wire becomes low, depending on the current value to be energized, there is a case where the cross-sectional area of the electric wire needs to be increased in order to suppress the amount of heat generated from the electric wire. However, increasing the diameter of the wire is not preferable because it increases the diameter and weight of the shield member and the protector.

  This invention is completed based on the above situations, Comprising: It aims at the improvement of the heat dissipation in a shield conductor.

  As a means for achieving the above object, the invention of claim 1 is a shield conductor for a vehicle in which an outer periphery of an electric wire is surrounded by a cylindrical protective member in a non-ventilated state, and the protective member includes Is characterized in that it is provided with an air supply opening that opens continuously in the passenger compartment of the vehicle and an exhaust opening that opens continuously with a space through which wind flows as the vehicle travels. .

  A second aspect of the invention is characterized in that, in the first aspect of the invention, the protective member is exposed and wired in a portion where wind flows as the vehicle travels.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the protection member is formed of a metal pipe having a shielding function.

<Invention of Claim 1>
According to the first aspect of the present invention, there is provided a shield conductor for a vehicle in which the outer periphery of the electric wire is surrounded by a cylindrical protective member in a non-ventilated state. There are provided an air supply port and an exhaust port that opens in connection with a space through which wind flows as the vehicle travels. According to such a configuration, the vicinity of the exhaust port becomes a negative pressure state due to the wind generated as the vehicle travels, and the air in the protection member is pulled toward the exhaust port side. Then, outside air is taken into the protective member through the air supply port, and an air flow from the air supply port toward the exhaust port is generated in the protective member. Thus, since the outside air passes through the inside of the protective member and is discharged from the exhaust port, it becomes difficult for heat to be trapped in the protective member, and the heat dissipation of the shield conductor is improved.

<Invention of Claim 2>
According to invention of Claim 2, the protection member is exposed and wired by the site | part where a wind flows along with driving | running | working of a vehicle. According to such a structure, when a vehicle drive | works, a wind will hit a protection member. Thereby, in addition to the outside air passing through the inside of the protective member, the outer peripheral surface is cooled by the wind, so that the heat dissipation of the shield conductor is reliably improved.

<Invention of Claim 3>
According to invention of Claim 3, the protection member is comprised with the metal pipes provided with the shield function. According to such a configuration, since it is not necessary to separately provide a shield member having a shield function and a protective member for protecting the electric wire, the number of parts can be reduced. Also, since it is made of metal, it has higher thermal conductivity than that made of synthetic resin, for example, and the heat generated from the wire can be efficiently released into the atmosphere, so the heat dissipation of the shield conductor is improved more reliably. To do.

  Embodiments of the present invention will be described below with reference to FIGS. The shield conductor 1 of the present embodiment is used as a power circuit for an electric vehicle EV.

  In FIG. 1, the side view which shows notionally the state by which the shield conductor 1 in this embodiment was used as a power circuit of the electric vehicle EV was shown. Hereinafter, in each component, the front of the electric vehicle EV in the traveling direction (left side in FIG. 1) will be described as the front, and the rear in the traveling direction (right side in FIG. 1) will be described as the rear.

  An engine room is provided in the front portion of the vehicle body 10 of the electric vehicle EV. In this engine room, an inverter I that constitutes a power circuit for driving a traveling motor and a gasoline-driven engine E are housed, and a motor M for driving front wheels is disposed below the inverter I. On the other hand, a battery B and a rear wheel drive motor (not shown) constituting a power circuit are arranged at the rear part of the vehicle body 10, and the battery B and the rear wheel drive motor are arranged at the front part. The inverter I is connected via the shield conductor 1. In the following description, shield conductor 1 disposed between battery B and inverter I will be described.

  The shield conductor 1 is routed in the front-rear direction under the floor of the vehicle body 10, that is, along the lower surface of the floor plate 11, and the shield conductor 1, the inverter I, and the battery B are connected to the front and rear ends, respectively. An in-vehicle conductive path 20 is connected. The space above the floor plate 11 is a vehicle interior space R of the electric vehicle EV, and the space below is a ventilation space S through which wind flows as the electric vehicle EV travels.

  The in-vehicle conductive path 20 is bent and routed in the engine room in which the inverter I is accommodated and in the accommodation room in which the battery B is disposed. A connector (not shown) is attached to the end of the in-vehicle conductive path 20, and this connector is fitted to the inverter I and the battery B, respectively. The inverter I and the front wheel drive motor M are also connected by the in-vehicle conductive path 20.

  The shield conductor 1 is obtained by inserting three electric wires 21 into a cylindrical pipe 22 (corresponding to the protective member of the present invention). FIG. 2 is an enlarged cross-sectional view showing a state where the shield conductor 1 is attached to the vehicle body 10.

  The electric wire 21 inserted through the pipe 22 is obtained by surrounding the outer periphery of a conductor 21A made of a single core wire made of metal (for example, aluminum alloy or copper alloy) with an insulating coating 21B made of synthetic resin. The three electric wires 21 are arranged in the pipe 22 so as to form a stacked shape (a form in which a substantially equilateral triangle is drawn when the centers of the electric wires 21 are connected), and the electric wires 21 and the electric wires 21 and the pipe 22 are arranged. There is a gap between them. Both end portions of each electric wire 21 are led out from both end edges of the pipe 22, and metal connection members (not shown) each provided with a pair of caulking pieces are fixed to the both ends. A conductor of an in-vehicle electric wire (not shown) of the in-vehicle conductive path 20 is fastened to the caulking piece, and the in-vehicle electric wire and the electric wire 21 of the shield conductor 1 are connected.

  The pipe 22 surrounding the electric wire 21 is made of metal (for example, an aluminum alloy, a copper alloy, or stainless steel), and has a long shape as a whole (see also FIG. 3). The pipe 22 has a form in which a front end portion rises forward along the lower surface of the floor plate 11, while a rear side is bent upward at a rear position, and an upper end portion thereof is provided on the floor plate 11. The wiring hole 12 is penetrated to reach the vehicle interior space R. A flange 23 is fixed to the end portion on the vehicle interior space R side, and the pipe 22 is formed by introducing the front end side from the flange 23 to the vehicle interior space R and fixing the flange 23 to the floor plate 11 with bolts 24. It is attached to the vehicle body 10.

  Further, the intermediate portion of the pipe 22 is fixed in a state of being suspended below the floor plate 11 by a metal bracket 30. The bracket 30 includes an attachment portion 31 that is fixed to the lower surface of the floor plate 11, an arm portion 32 that hangs downward from the attachment portion 31, and a pipe mounting portion 33 that is provided at the lower end of the arm portion 32. . The attachment portion 31 has a plate shape and is fixed to the lower surface of the floor plate 11 by bolting or welding. The pipe mounting portion 33 has a cylindrical shape that is externally fitted to the pipe 22, and the pipe 22 is mounted in a state in which displacement is restricted in the radial direction by passing through the pipe mounting portion 33 in the axial direction. The pipe 22 is arranged at a position below the lower surface of the floor plate 11 by the amount of the arm portion 32 hanging down, and a gap is provided between the outer periphery of the pipe 22 and the lower surface of the floor plate 11. Wind is easy to flow over the outer periphery of the. In this way, the pipe 22 is routed in a state where most of the pipe 22 is exposed to the lower side of the floor plate 11 (portion where the wind flows as the electric vehicle EV travels).

  Caps 25 are respectively placed on both ends of the pipe 22. The cap 25 is made of an elastic member and is in close contact with the opening of the pipe 22 in an airtight manner. Each of the caps 25 is formed with three through holes 26 that penetrate the caps 25 in the wiring direction of the electric wires 21. The electric wires 21 pass through the through holes 26 one by one and are led out from both end edges of the pipe 22. In addition, the outer periphery of the electric wire 21 and the inner periphery of the through hole 26 are also in close contact with each other in an airtight manner.

  The pipe 22 is provided with an air supply port 27 and an exhaust port 28. The air supply port 27 is provided at a position closer to the front end side than the position where the flange 23 is fixed at the end of the pipe 22 on the vehicle interior space R side, that is, at a portion disposed in the vehicle interior space R. The air supply port 27 is formed so as to penetrate the peripheral wall in the wall thickness direction at the rear position of the peripheral wall of the pipe 22, and an air supply tube 27 </ b> A extends from the air supply port 27. The air supply pipe 27A has a cylindrical shape with a smaller diameter than the pipe 22, extends backward from the air supply port 27, and then bends upward. The extension end is located in the vehicle interior space R. The air supply port 27 and the vehicle interior space R communicate with each other through the air supply pipe 27A.

  On the other hand, the exhaust port 28 is provided at the front end position of a portion of the pipe 22 that is arranged almost horizontally. The exhaust port 28 is formed at a lower position of the peripheral wall of the pipe 22 so as to penetrate the peripheral wall in the wall thickness direction, and an exhaust pipe 28A extends from the exhaust port 28. The exhaust pipe 28A has a smaller diameter than the pipe 22, extends downward from the position of the exhaust port 28, and then bends backward (opposite to the traveling direction of the electric vehicle EV). The exhaust pipe 28A The exhaust port 28 and the ventilation space S are in communication with each other.

Next, the operation and effect of the present embodiment configured as described above will be described.
FIG. 3 is an enlarged conceptual diagram showing a state in which the outside air taken into the pipe 22 through the air supply port 27 in the present embodiment passes through the pipe 22 and is discharged from the exhaust port 28.

  When the traveling switch of the electric vehicle EV is turned on, the wind generated by the traveling of the electric vehicle EV causes a negative pressure in the vicinity of the extended end of the exhaust pipe 28A, so that the air in the exhaust pipe 28A is drawn out. Arise. Accordingly, the air in the pipe 22 is pulled toward the exhaust pipe 28A side, that is, the exhaust port 28 side. Then, as indicated by an arrow in FIG. 3, air is taken in from the extending end of the air supply pipe 27 </ b> A, and the air flows into the pipe 22 through the air supply port 27. The air that has flowed in is pulled toward the exhaust port 28, passes through the gaps between the electric wires 21 and between the electric wires 21 and the pipe 22 in the pipe 22, reaches the exhaust port 28, and from the tip of the exhaust pipe 28A to the external space. Discharged. Thus, an air flow from the air supply port 27 toward the exhaust port 28 is generated in the pipe 22. The air contacts the outer peripheral surface of the electric wire 21 to cool the electric wire 21, and the heat in the pipe 22 is discharged from the exhaust port 28 to the outside.

  In addition, when the electric vehicle EV is traveling, wind is generated along with the traveling. Here, the pipe 22 is routed in a state where most of the pipe 22 is exposed to a portion where the wind flows. Thus, the wind comes into contact with the outer peripheral surface of the pipe 22 and cools the pipe 22 from the outside. Therefore, the pipe 22 is cooled not only in its interior but also in the air due to the traveling air, so that the heat dissipation of the shield conductor 1 can be improved more reliably.

  Further, the metal pipe 22 has both a shielding function and a protection function for the electric wire 21. Thus, a shield member having a shield function, for example, a braided member made of a thin metal wire is surrounded by a protector made of a synthetic resin to protect the electric wires 21, and the shield member and the protection member need not be provided separately. Because it is good, the number of parts is small. Further, since the pipe 22 is made of metal, it has a higher thermal conductivity than that made of synthetic resin, and the heat generated from the electric wire 21 is efficiently transmitted to the pipe 22 and is dissipated from the outer peripheral surface of the pipe 22 to the atmosphere. The Therefore, the heat dissipation of the shield conductor 1 is further improved. In addition, since the pipe 22 is being fixed to the floor board 11 via the metal bracket 30, in addition to the heat transmitted from the electric wire 21 to the pipe 22 being radiated from the pipe 22 to the external space, the bracket 22 It is transmitted to the vehicle body 10 via 30 and is also radiated from there.

  When the heat dissipation of the shield conductor 1 is improved in this way, the allowable current value of the electric wire 21 is increased. Therefore, it is not necessary to increase the diameter of the electric wire 21 in order to secure a predetermined amount of electric current. Can also be planned.

  As described above, according to the present embodiment, the pipe 22 has the air supply port 27 that opens to the interior space R of the electric vehicle EV and the exhaust port that opens to the ventilation space S. 28 are provided. As a result, the vicinity of the exhaust port 28 is brought into a negative pressure state by the wind generated as the electric vehicle EV travels, and outside air is taken into the pipe 22 through the air supply port 27. An air flow toward the exhaust port 28 is generated. As described above, since the outside air passes through the inside of the pipe 22 and is discharged from the exhaust port 28, it becomes difficult for heat to be trapped in the pipe 22, and the heat dissipation of the shield conductor 1 is improved.

  Further, the pipe 22 is routed so as to be exposed at a portion where the wind flows as the electric vehicle EV travels. Thereby, in addition to the outside air passing through the inside of the pipe 22, the outer peripheral surface is cooled by the wind, so that the heat dissipation of the shield conductor 1 is reliably improved.

  The metal pipe 22 has both a shielding function and a protection function for the electric wire 21. Thereby, it is not necessary to separately provide a shield member having a shield function and a protective member for protecting the electric wire 21, and the number of components can be reduced. Further, since the pipe 22 is made of metal, for example, it has higher thermal conductivity than that made of synthetic resin, and heat generated from the electric wire 21 can be efficiently released into the atmosphere. Will improve more reliably.

<Other embodiments>
The present invention is not limited to the embodiments 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-described embodiment, the three electric wires 21 are arranged in a stacked manner in the pipe 22, but the number and arrangement of the electric wires may not be as such, for example, Two electric wires may be inserted into the pipe, or may be arranged in a line.

  (2) In the above embodiment, the pipe 22 has a cylindrical shape, but the pipe may have any shape as long as it has a shape that can surround the outer periphery of the electric wire. For example, the pipe 22 has a rectangular tube shape. Also good.

  (3) In the above embodiment, the pipe 22 is routed in a state where most of the pipe 22 is exposed to the lower side of the vehicle body 10, and is cooled by wind generated when the electric vehicle EV travels or air flowing in the pipe 22. However, if the air supply opening opens to the interior space and the exhaust opening opens in the ventilation space, most of the pipe itself is routed in the interior space. Of course, it may be cooled only by the air flowing in the pipe.

  (4) In the above embodiment, the air supply port 27 is configured to communicate with the space of the vehicle interior space R via the air supply tube 27A. However, the present invention is not limited to this, and for example, the air supply port is connected via the air supply tube. It may be configured to open directly into the vehicle interior space.

  (5) In the above embodiment, the exhaust port 28 communicates with the ventilation space S via the exhaust pipe 28A. However, the present invention is not limited to this. For example, the exhaust port directly passes through the ventilation space without passing through the exhaust pipe. You may be made into the form opened to.

  (6) In the above embodiment, one air supply port 27 and one air discharge port 28 are provided on the peripheral wall of the pipe 22, but the present invention is not limited to this. For example, two or more air supply ports 27 and exhaust ports 28 may be provided. Three vents and one exhaust port may be provided.

  (7) In the above-described embodiment, the air supply port 27 and the exhaust port 28 are formed so as to penetrate the peripheral wall of the pipe 22 in the wall thickness direction. May be formed so as to penetrate through a cap that covers the end of the pipe in the thickness direction.

  (8) In the above embodiment, the exhaust pipe 28A is provided so as to open toward the rear side of the electric vehicle EV. However, the exhaust pipe is provided so as to generate a negative pressure due to the wind accompanying the running of the electric vehicle. As long as it is open, it may be opened in any direction. For example, it may be opened obliquely or orthogonally to the front-rear direction of the electric vehicle.

  (9) In the above embodiment, the exhaust pipe 28A extends downward from the position of the exhaust port 28 of the pipe 22 and then bends backward. In addition, for example, as shown in FIG. A diaphragm plate 40 may be provided below the exhaust pipe 28A. The throttle plate 40 is a plate that is bent so as to gradually narrow the space around the exhaust pipe 28A from the front to the rear of the exhaust pipe 28A. As a result, the speed of the wind generated during traveling can be gradually increased from the front of the exhaust pipe 28A toward the extended end side. Then, since a larger negative pressure is generated in the vicinity of the extended end, the air cooling in the pipe 22 is more reliably performed.

The side view which shows notionally the state by which the shield conductor in this embodiment was used as a power circuit of an electric vehicle Enlarged sectional view showing a state where the shield conductor is attached to the vehicle body The expanded conceptual diagram which shows a mode that the external air taken in in the pipe via the air supply port in this embodiment passes through the inside of a pipe, and is discharged | emitted from an exhaust port. Partial enlargement conceptual diagram of the exhaust port portion in the shield conductor according to another embodiment (9)

Explanation of symbols

EV ... Electric car (vehicle)
R ... Vehicle interior space (vehicle interior)
S ... Ventilation space (space where wind flows as the electric vehicle runs)
DESCRIPTION OF SYMBOLS 1 ... Shield conductor 21 ... Electric wire 22 ... Pipe (protection member)
27 ... Air supply port 28 ... Exhaust port

Claims (3)

A shield conductor for a vehicle in which an outer periphery of an electric wire is surrounded by a cylindrical protective member in a non-ventilated state,
The protective member is provided with an air supply opening that is open to the vehicle interior of the vehicle and an exhaust opening that is open to a space through which wind flows as the vehicle travels. Shield conductor characterized by. 2. The shield conductor according to claim 1, wherein the protection member is exposed and arranged in a portion where wind flows as the vehicle travels. The shield conductor according to claim 1, wherein the protection member is formed of a metal pipe having a shield function.

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