Harness heat dissipation structure

Abstract

To provide a harness heat radiation structure which can efficiently radiate heat generated in plate-like conductors of a wire harness.SOLUTION: A harness heat radiation structure 1 includes: a wire harness 3 arranged in a body panel 115 of a vehicle 100; and a pressing member 5 which presses the wire harness 3 against the body panel 115. The wire harness 3 has conductive bus bars 10. The bus bar 10 has a rectangular cross-sectional shape as seen in a direction orthogonal to an arrangement direction of the wire harness 3. The body panel 115 has, in a portion where the pressing member 5 is attached and each bus bar 10 of the wire harness 3 is pressed by the pressing member 5, a thick part 117 formed thicker than surrounding portions.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a harness heat dissipation structure. [Background technology]

[0002] Wire harnesses used in vehicles such as electric vehicles and plug-in hybrid vehicles include electric wires that electrically connect a high-voltage battery to an inverter or other electrical equipment (see, for example, Patent Document 1). The wire harness described in Patent Document 1 includes a plurality of electric wires, a pair of connectors attached to both ends of the electric wires, a plurality of exterior members into which the plurality of electric wires are inserted one by one, and a plurality of clamps. Each exterior member protects the electric wires from, for example, flying objects or water droplets. The plurality of exterior members are fixed to the vehicle body or the like by clamps. With this configuration, heat generated in the electric wires can be transferred to the vehicle body, which has a large surface area, through the exterior members and the clamps. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-21556 Summary of the Invention [Problem to be solved by the invention]

[0004] As vehicles become more electrified, larger currents flow through wire harnesses, and as this current increases, measures are needed to deal with Joule heat generated, particularly in the plate conductors (bus bars) of the wire harness. When a wire harness is fixed to a vehicle body for the purpose of heat dissipation, as in Patent Document 1, the vehicle body is generally made of iron or steel plate, and therefore has a relatively small heat capacity, so heat dissipation by thermal conduction from the plate conductors of the wire harness to the vehicle body may not be sufficient.

[0005] The present invention has been made in view of the problems inherent in the conventional art, and an object of the present invention is to provide a harness heat dissipation structure that can efficiently dissipate heat generated in the plate-like conductor of a wire harness. [Means for solving the problem]

[0006] A harness heat dissipation structure according to an embodiment of the present invention includes a wire harness arranged in a vehicle body and a pressing member that presses the wire harness against the vehicle body, wherein the wire harness has a conductive plate-shaped conductor that has a rectangular cross-sectional shape in a direction perpendicular to the wiring direction of the wire harness, and the vehicle body has a thick portion that is thicker than the surrounding area at a location where the pressing member is attached and where the plate-shaped conductor of the wire harness is pressed by the pressing member. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a harness heat dissipation structure that can efficiently dissipate heat generated in the plate-like conductor of the wire harness. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing a schematic configuration of high-voltage wiring of an electric vehicle to which the present embodiment is applied; [Figure 2] 1 is a schematic perspective view showing an example of a harness heat dissipation structure according to an embodiment of the present invention; [Figure 3] 1 is a schematic cross-sectional view showing an example of a harness heat dissipation structure according to an embodiment of the present invention. [Figure 4] FIG. 10 is a schematic cross-sectional view showing a harness heat dissipation structure according to another embodiment. [Figure 5] FIG. 10 is a schematic cross-sectional view showing a harness heat dissipation structure according to another embodiment. [Figure 6] FIG. 10 is a schematic cross-sectional view showing a harness heat dissipation structure according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The harness heat dissipation structure according to the present embodiment will be described in detail below with reference to the drawings. Note that the dimensional proportions in the drawings are exaggerated for the sake of convenience and may differ from the actual proportions.

[0010] The harness heat dissipation structure 1 according to this embodiment can be applied to high-voltage wiring of an electric vehicle as shown in FIG.

[0011] As shown in Fig. 1, a vehicle 100 has an inverter 101 and a motor 103 disposed as load units, for example, on the front side in the vehicle longitudinal direction. The inverter 101 is electrically connected to a high-voltage battery 107 via a front high-voltage wiring 105, and converts DC power supplied from the high-voltage battery 107 via the front high-voltage wiring 105 into AC power. The inverter 101 also supplies the converted AC power to the motor 103. The motor 103 is driven by the power supplied from the inverter 101, and rotates front wheels 109 via a drive shaft or the like of the vehicle 100.

[0012] Vehicle 100 also has a charging port 111 disposed, for example, on the rear side in the vehicle longitudinal direction. Charging port 111 has a charging inlet to which an external charging device (not shown) serving as a charger is connected. Charging port 111 is electrically connected to high-voltage battery 107 via rear high-voltage wiring 113, and supplies power from the external charging device via rear high-voltage wiring 113 to high-voltage battery 107.

[0013] As shown in FIGS. 2 and 3, the harness heat dissipation structure 1 according to this embodiment includes a wire harness 3 and a pressing member 5.

[0014] The wire harness 3 is routed in a body panel 115 (see FIG. 1) that constitutes a part of the body of the vehicle 100. The wire harness 3 has a bus bar 10 as a conductive plate-shaped conductor, and the bus bar 10 is made of a metal material such as copper or aluminum. The wire harness 3 has a plurality of bus bars 10 (two in this embodiment), but is not limited thereto, and the wire harness 3 may have a single bus bar 10.

[0015] The busbar 10 has a rectangular cross section in a direction perpendicular to the wiring direction of the wire harness 3. The busbar 10 has a pair of long side surfaces 11, 11 and a pair of short side surfaces 13, 13, and is formed to have a rectangular cross section.

[0016] In this embodiment, the busbar 10 is disposed lying on its side so that the pair of long side surfaces 11, 11 are parallel to the upper surface of the body panel 115. Therefore, the upper surface of the busbar 10 (one of the pair of long side surfaces 11, 11) faces an upper surface 21 of the pressing member 5, which will be described later, and the lower surface of the busbar 10 (the other of the pair of long side surfaces 11, 11) faces a thick portion 117 of the body panel 115, which will be described later.

[0017] The pressing member 5 is used to press the wire harness 3 against the body panel 115. The pressing member 5 may be made of a synthetic resin material or a metal material. In this embodiment, the pressing member 5 has an upper surface portion 21 extending in a direction intersecting the routing direction of the wire harness 3, and a pair of side surface portions 23, 23 extending from both ends of the upper surface portion 21 in the extending direction toward the thick portion 117 of the body panel 115. The pressing member 5 further has a pair of flange portions 25, 25 extending in directions away from each other from the lower end of the side surface portion 23 and joined to the thick portion 117 using a joining member such as a bolt 7, and is formed into a hat-shaped cross section.

[0018] Furthermore, a partition wall portion 27 extending toward the thick portion 117 of the body panel 115 is formed at a location between the plurality of bus bars 10 on the upper surface portion 21 of the pressing member 5 .

[0019] Bus bar 10 pressed against body panel 115 is arranged in a space surrounded by upper surface portion 21 of pressing member 5, a pair of side surfaces 23, 23, and thick portion 117 of body panel 115.

[0020] In addition, a heat dissipation sheet 30 serving as a heat dissipation member having thermal conductivity is disposed between the bus bar 10 and the thick portion 117 of the body panel 115 in order to efficiently transfer heat generated in the bus bar 10 to the thick portion 117 of the body panel 115. This heat dissipation sheet 30 is also called a thermally conductive sheet, and is disposed in close contact with the bus bar 10 and the thick portion 117 of the body panel 115.

[0021] The wire harness 3 and the pressing member 5 are disposed on the interior side of the body panel 115 (above the floor).

[0022] The body panel 115 has a thick portion 117 formed thicker than the surrounding portion at a location where the pressing member 5 is attached and where the bus bar 10 of the wire harness 3 is pressed by the pressing member 5. A general portion 119 that is thinner than the thick portion 117 is formed around the thick portion 117 in the body panel 115. The thick portion 117 is formed so as to protrude into the passenger compartment of the body panel 115. A metal plate that forms part of the thick portion 117 may be attached by welding or the like to the body panel 115 made of an iron plate or steel plate. When the body panel 115 is produced by casting, the thick portion 117 may be molded integrally with the body panel 115 during casting. That is, the thick portion 117 may be formed integrally with the body panel 115, or may be formed separately from the body panel 115 and attached to the body panel 115.

[0023] As described above, the harness heat dissipation structure 1 according to this embodiment includes the wire harness 3 arranged in the vehicle body (body panel 115) of the vehicle 100, and the pressing member 5 that presses the wire harness 3 against the vehicle body (body panel 115). The wire harness 3 has a conductive plate-shaped conductor (bus bar 10), and the plate-shaped conductor (bus bar 10) has a rectangular cross section in a direction perpendicular to the wiring direction of the wire harness 3. The vehicle body (body panel 115) has a thick portion 117 that is thicker than the surrounding area at a location where the pressing member 5 is attached and where the pressing member 5 presses the plate-shaped conductor (bus bar 10) of the wire harness 3.

[0024] By using the pressing member 5 to press the bus bar 10 against the body panel 115, Joule heat generated in the bus bar 10 can be transferred to the body panel 115 and dissipated, thereby suppressing a temperature rise in the wire harness 3. This makes it possible to avoid increasing the size of the components (particularly the bus bar 10) that make up the wire harness 3 in order to suppress heat generation in the wire harness 3, thereby making it possible to reduce the weight of the wire harness 3 and the manufacturing cost.

[0025] Furthermore, by forming thick portions 117 at the locations of the body panel 115 where the busbar 10 is pressed by the pressing member 5, it is possible to increase the heat capacity of the body panel 115, thereby suppressing or delaying the temperature rise time of the wire harness 3. This makes it possible to avoid increasing the size of the components (particularly the busbar 10) that constitute the wire harness 3 in order to suppress heat generation in the wire harness 3, thereby enabling reductions in the weight and manufacturing costs of the wire harness 3.

[0026] As described above, according to this embodiment, it is possible to provide the harness heat dissipation structure 1 that can efficiently dissipate heat generated in the plate-like conductor (bus bar 10) of the wire harness 3.

[0027] In the harness heat dissipation structure 1, a heat dissipation member (heat dissipation sheet 30) having thermal conductivity may be disposed between the plate-shaped conductor (bus bar 10) and the thick portion 117 of the vehicle body (body panel 115).

[0028] By placing the heat dissipation sheet 30 on the portion of the bus bar 10 that contacts the body panel 115, the gap between the bus bar 10 and the body panel 115 can be filled, allowing heat to be efficiently transferred from the bus bar 10 to the body panel 115.

[0029] In the harness heat dissipation structure 1, the pressing member 5 may have an upper surface portion 21 extending in a direction intersecting the routing direction of the wire harness 3, and a pair of side surfaces 23, 23 extending from both ends of the upper surface portion 21 in the extending direction toward a thick portion 117 of the vehicle body (body panel 115). The pressing member 5 may further have a pair of flanges 25, 25 extending in directions away from each other from the lower end of the side surface portion 23 and coupled to the thick portion 117, and may be formed with a hat-shaped cross section. The plate-shaped conductor (bus bar 10) pressed against the vehicle body (body panel 115) may be disposed in a space surrounded by the upper surface portion 21 of the pressing member 5, the pair of side surfaces 23, 23, and the thick portion 117 of the vehicle body (body panel 115).

[0030] By pressing the bus bar 10 against the body panel 115 using a pressing member 5 formed with a hat-shaped cross section, the heat generated in the bus bar 10 can be sufficiently transferred to the body panel 115, thereby improving the heat dissipation performance of the harness heat dissipation structure 1.

[0031] [Other embodiments] Harness heat dissipation structures 1A, 1B, and 1C according to other embodiments will be described below with reference to Figures 4 to 6. Components that are substantially the same as those in the harness heat dissipation structure 1 described above will be assigned the same reference numerals, and descriptions thereof will be omitted.

[0032] As shown in FIG. 4 , in the harness heat dissipation structure 1A, a plurality of heat dissipation fins 121 are formed on the outer side of the vehicle cabin (under the floor) of the body panel 115 where the thick-walled portion 117 is formed. The attachment direction and shape of the heat dissipation fins 121 can be appropriately set so that air heated by heat conduction from the bus bar 10 does not stagnate between the plurality of heat dissipation fins 121. The metal material constituting the heat dissipation fins 121 may be attached to the body panel 115 made of an iron plate or a steel plate by welding or the like. When the body panel 115 is produced by casting, the heat dissipation fins 121 may be molded integrally with the body panel 115 during casting. That is, the heat dissipation fins 121 may be formed integrally with the body panel 115, or may be formed separately from the body panel 115 and attached to the body panel 115.

[0033] In this way, in the harness heat dissipation structure 1A, the wire harness 3 and the pressing member 5 may be arranged on the passenger compartment side (above the floor) of the vehicle body (body panel 115). A heat dissipation fin 121 may be formed on the passenger compartment side (under the floor) of the vehicle body (body panel 115) at a location where the thick-walled portion 117 is formed.

[0034] By forming heat dissipation fins 121 on the back side of the mounting surface of the bus bar 10 in the body panel 115 and increasing the area (surface area) of the body panel 115 that comes into contact with the outside air, it is possible to further improve the heat dissipation performance of the harness heat dissipation structure 1.

[0035] 5, in the harness heat dissipation structure 1B, the bus bar 10 is arranged upright so as to be perpendicular to the body panel 115. Therefore, the upper surface of the bus bar 10 (one of the pair of short side surfaces 13, 13) faces the upper surface 21 of the pressing member 5, which will be described later, and the lower surface of the bus bar 10 (the other of the pair of short side surfaces 13, 13) faces the thick portion 117 of the body panel 115.

[0036] In this way, in the harness heat dissipation structure 1B, the plate-shaped conductor (bus bar 10) may be arranged upright so as to be perpendicular to the vehicle body (body panel 115).

[0037] Depending on the installation requirements for the wire harness 3 on the vehicle 100, the bus bar 10 may be installed with its longitudinal direction in an upright position as shown in FIG. 5. Even in this case, the heat generated in the bus bar 10 can be efficiently transferred to the thick portion 117 of the body panel 115.

[0038] 6, in the harness heat dissipation structure 1C, a rib portion 123 serving as a wall portion standing perpendicular to the body panel 115 is formed on a thick portion 117 of a body panel 115, and the bus bar 10 is pressed against the rib portion 123 by a spring member 31. Therefore, one side surface of the bus bar 10 (one of the pair of long side surfaces 11, 11) faces the rib portion 123 of the body panel 115, and the other side surface of the bus bar 10 (the other of the pair of long side surfaces 11, 11) faces the spring member 31. In addition, heat-conducting members 40 are disposed between the bus bar 10 and the thick portion 117 of the body panel 115, and between the bus bar 10 and the rib portion 123 of the body panel 115, respectively. The heat conduction member 40 is intended to efficiently conduct heat generated in the bus bar 10 to the thick portion 117 and the rib portion 123 of the body panel 115, and is made of, for example, thermal paste or a thermally conductive resin. The harness heat dissipation structure 1C also uses a case 41 with an L-shaped cross section, whose main purpose is to hold the bus bar 10 when the pressing member 5 is attached to the body panel 115. The case 41 is made of, for example, a synthetic resin material.

[0039] In this manner, in the harness heat dissipation structure 1C, a wall portion (rib portion 123) that stands perpendicular to the vehicle body (body panel 115) may be formed on the thick-walled portion 117 of the vehicle body (body panel 115). The plate-shaped conductor (bus bar 10) may be pressed against the wall portion (rib portion 123) by the spring member 31.

[0040] When busbar 10 is mounted with its longitudinal direction standing as shown in Fig. 5, only short side surface 13 of busbar 10 faces thick portion 117, and it is predicted that the heat dissipation effect will be smaller than when long side surface 11 of busbar 10 faces thick portion 117. For this reason, as shown in Fig. 6, by forming rib portion 123 on thick portion 117 of body panel 115 and pressing busbar 10 against rib portion 123 using spring member 31, it is possible to improve the heat dissipation effect.

[0041] Although the present embodiment has been described above, the present embodiment is not limited to this, and various modifications are possible within the scope of the gist of the present embodiment. [Explanation of symbols]

[0042] 1. Harness heat dissipation structure 3 Wire harness 5 Pressing member 10 Busbar 21 Top part 23 Side part 25 flange 30 Heat dissipation sheet 31 Spring member 40 Thermal Conduction Material 100 vehicles 115 body panels 117 Thick wall part 121 Heat dissipation fin 123 Rib section

Claims

1. a wire harness arranged in a vehicle body; a pressing member that presses the wire harness against the vehicle body, The wire harness has a conductive plate-shaped conductor, The plate-shaped conductor has a rectangular cross section in a direction perpendicular to the wiring direction of the wire harness, the vehicle body has a thick portion formed to be thicker than a surrounding portion at a location where the pressing member is attached and where the plate-shaped conductor of the wire harness is pressed by the pressing member, the thick portion is integrally formed with the vehicle body, and the pressing member is connected to the thick portion using a connecting member. Harness heat dissipation structure.

2. The harness heat dissipation structure according to claim 1 , further comprising a heat-conductive heat dissipation member disposed between the plate-shaped conductor and the thick portion of the vehicle body.

3. the wire harness and the pressing member are disposed on the interior side of the vehicle body, a heat dissipation fin is formed on the outer side of the vehicle cabin at a location where the thick-walled portion is formed in the vehicle body; The harness heat dissipation structure according to claim 1 or 2.

4. The harness heat dissipation structure according to claim 1 or 2, wherein the plate-shaped conductor is disposed upright so as to be perpendicular to the vehicle body.

5. a wall portion that stands perpendicular to the vehicle body is formed in the thick-wall portion of the vehicle body, The plate-shaped conductor is pressed against the wall portion by a spring member. The harness heat dissipation structure according to claim 4.

6. The pressing member is an upper surface portion extending along a direction intersecting a wiring direction of the wire harness; a pair of side surfaces extending from both ends of the upper surface portion in an extension direction toward the thick portion of the vehicle body; a pair of flange portions extending from lower ends of the side surfaces in directions away from each other and connected to the thick-walled portion; and the flange portions are formed in a hat-shaped cross section; the plate-shaped conductor pressed against the vehicle body is disposed in a space surrounded by an upper surface of the pressing member, the pair of side surfaces, and the thick portion of the vehicle body. The harness heat dissipation structure according to claim 1 or 2.

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