Electric connection box

Abstract

To provide an electric connection box for inhibiting a temperature of an electrification component housed inside a box body from increasing.SOLUTION: An electric connection box 1 comprises an electrification component 4 including a bus bar 2A and a box body 5 that houses the electrification component 4. The box body 5 includes a tabular frame 6 having a support part 60 for supporting the bus bar and a first cover 8 that is assembled to the frame 6. The first cover 8 includes a tabular first cover body 81 that covers one surface of the frame 6, a pressing part 71 that is provided at the first cover body 81 and can press the bus bar 2A, and a pressed part 72 that is provided on the side opposite to the pressing part 71 with the bus bar 2A interposed therebetween. The pressing part 71 comprises a cantilever-shaped arm body 710, and a pressing protrusion 711 provided at a free end of the arm body 710. The bus bar 2A is pressed onto the pressed part 72 by the pressing protrusion 711.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an electrical junction box. [Background technology]

[0002] One example of an electrical connection box mounted on an automobile is an electrical connection box that is configured by assembling electronic components such as fuses and relays, bus bars, etc. to a frame, an upper cover to the top surface of the frame, and a lower cover to the bottom surface of the frame (see, for example, Patent Document 1).

[0003] The electrical junction box disclosed in Patent Document 1 includes a base on which electrical components are mounted, a pair of sidewall members provided on both sides of the base, and a pair of bus bars sandwiched between the base and the sidewall members and connected to the electrical components. This electrical junction box has a heat dissipation space between the base and each bus bar. When the bus bars are energized, relatively low-temperature outside air flows into the heat dissipation space from below, generating an upward airflow. The airflow in the heat dissipation space removes heat from the bus bars and releases it into the atmosphere. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-161401 Summary of the Invention [Problem to be solved by the invention]

[0005] However, although the conventional electrical junction box disclosed in Patent Document 1 is configured to form a heat dissipation space and to exhaust the air inside the box body to the outside, the heat dissipation performance of the conventional electrical junction box is insufficient, and the electronic components and bus bars that serve as current-carrying components generate heat when current is applied, and there is a concern that the generated heat will cause the temperature inside the electrical junction box to rise beyond the allowable temperature of the components.

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide an electrical junction box that suppresses temperature rise of current-carrying components housed inside the box body. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the above-mentioned object, the invention described in claim 1 is an electrical connection box comprising: an electrically conductive component including a bus bar; and a box body that houses the electrically conductive component; the box body having a plate-shaped frame with a support portion for supporting the bus bar; and a first cover assembled to the frame; the first cover having a plate-shaped first cover body that covers one side of the frame; a pressing portion provided on the first cover body that can press the bus bar; and a pressed portion provided on the opposite side of the pressing portion across the bus bar; the pressing portion having a cantilever-shaped arm body and a pressing protrusion provided on a free end of the arm body; and the bus bar being pressed against the pressed portion by the pressing protrusion. [Effects of the Invention]

[0008] According to the invention as set forth in claim 1, it is possible to suppress a rise in temperature of the current-carrying parts housed inside the box body. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a plan view of an electrical junction box according to an embodiment of the present invention, viewed from above; [Figure 2] FIG. 2 is a diagram showing the electrical junction box in FIG. 1 with a first cover omitted. [Figure 3] 2 is a cross-sectional perspective view showing a main part of the electrical junction box shown in FIG. 1. FIG. [Figure 4] FIG. 4 is a diagram showing the electrical junction box in FIG. 3 with the bus bars constituting the box omitted. [Figure 5] FIG. 4 is a cross-sectional view taken along line II in FIG. [Figure 6] FIG. 10 is a cross-sectional perspective view showing a modified example of the electrical junction box. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will be described below with reference to Figs. 1 to 5. Fig. 1 is a plan view of an electrical junction box 1 according to an embodiment of the present invention, viewed from above. Fig. 2 is a view showing the electrical junction box 1 of Fig. 1, with an upper cover 8 (first cover) constituting the electrical junction box 1 omitted. Fig. 3 is a cross-sectional perspective view showing a main part of the electrical junction box 1 shown in Fig. 1. Fig. 4 is a view showing the electrical junction box 1 of Fig. 3, with a specific bus bar 2A (bus bar) constituting the electrical junction box 1 omitted. Fig. 5 is a cross-sectional view taken along line II in Fig. 3.

[0011] The electrical junction box 1 shown in FIG. 1 is mounted on an automobile and is disposed between a power source and a load to distribute power. As shown in FIGS. 1 and 2, the electrical junction box 1 includes: an electrically conductive component 4 (shown in FIG. 2) including bus bars 2A, 2B, 2C, and 2D and a pair of electronic components 3A and 3B; and a box body 5 that houses the electrically conductive component 4. As shown in FIGS. 1 and 3, the box body 5 includes a frame 6 that supports the electrically conductive component 4; an upper cover 8 (first cover) having a heat dissipation structure 7; and a lower cover 9 (second cover, shown in FIG. 3). The frame 6 and the upper cover 8 are assembled by a first assembly means (not shown); and the frame 6 and the lower cover 9 are assembled by a second assembly means (not shown). The upper cover 8 and the lower cover 9 are disposed opposite each other across the frame 6 when assembled to the frame 6. As shown in FIGS. 1 and 2, the electrical junction box 1 of this embodiment is formed in a rectangular shape that is horizontally elongated (in the left-right direction X) in a plan view.

[0012] In this embodiment, arrows X, Y, and Z are directions perpendicular to one another. In a plan view of the electrical junction box 1 shown in Figures 1 and 2, the longitudinal direction is indicated by arrow X and may be referred to as the "left-right direction X," the width direction is indicated by arrow Y and may be referred to as the "front-rear direction Y," and the direction perpendicular to arrows X and Y is indicated by arrow Z and may be referred to as the "up-down direction Z." In this embodiment, the up-down direction Z is the same direction as the vertical direction.

[0013] As shown in FIG. 2, the current-carrying component 4 includes a pair of electronic components 3A and 3B each formed of a fuse, a relay, or the like, and bus bars 2A, 2B, 2C, and 2D connected to the electronic components 3A and 3B, respectively.

[0014] As shown in FIG. 2 , of the bus bars 2A, 2B, 2C, and 2D, the bus bars 2A and 2B are electrically and mechanically connected to an electronic component 3A, and the bus bars 2C and 2D are electrically and mechanically connected to an electronic component 3B. Hereinafter, one of the pair of electronic components 3A and 3B may be referred to as the “first electronic component 3A,” and the other may be referred to as the “second electronic component 3B.” Furthermore, the pair of bus bars 2A and 2B connected to both ends of the first electronic component 3A may be referred to as the “pair of first connecting bus bars 2A and 2B,” and the pair of bus bars 2C and 2D connected to both ends of the second electronic component 3B may be referred to as the “pair of second connecting bus bars 2C and 2D.”

[0015] As shown in Fig. 2, when such a current-carrying component 4 is assembled to a frame 6, a first electronic component 3A and a second electronic component 3B are arranged side by side and spaced apart in the left-right direction X. A pair of first connection bus bars 2A, 2B electrically connected to both ends of the first electronic component 3A are arranged on both sides of the first electronic component 3A in the left-right direction X. A pair of second connection bus bars 2C, 2D electrically connected to both ends of the second electronic component 3B are arranged on one side of the second electronic component 3B in the front-rear direction Y and side by side in the left-right direction X. One of the pair of first connection bus bars 2A, 2B (hereinafter sometimes referred to as a "specific bus bar 2A (bus bar)") and one of the pair of second connection bus bars 2C, 2D, 2C, are electrically and mechanically connected to each other.

[0016] As shown in Fig. 2, the specific bus bar 2A is formed by punching and bending a metal plate. The specific bus bar 2A integrally includes a first bus bar portion 20 connected to a first electronic component 3A and a second bus bar portion 21 connected to a second electronic component 3B. The first bus bar portion 20 and the second bus bar portion 21 are arranged side by side in the front-to-rear direction Y. The first bus bar portion 20 is located between the pair of electronic components 3A and 3B, and the second bus bar portion 21 is located in front of the pair of electronic components 3A and 3B in the direction X1, and is not located between the pair of electronic components 3A and 3B.

[0017] As shown in Figures 2 and 3, the first bus bar portion 20 comprises a plate-shaped entering bus bar 22 that extends upward Z1 and enters between the pressing portion 71 and the pressed portion 72 of the heat dissipation structure portion 7 provided on the upper cover 8 described later, and a first connecting piece 23 (extending bus bar) that is bent and extended from the lower end of the entering bus bar 22 and is electrically connected to the first electronic component 3A.

[0018] As shown in FIG. 3, the entrance busbar 22 is supported by the frame 6 with its plate thickness direction aligned with the left-right direction X, and is configured to be pressed between a pressing portion 71 and a pressed portion 72 of the heat dissipation structure 7 provided on the upper cover 8, which will be described later.

[0019] 3, the first connection piece 23 is provided in a plate shape extending in the front-rear direction Y and the left-right direction X, and has a first bolt hole 23A in its center, through which a first bolt B1 is inserted. With the first bolt B1 inserted into the first bolt hole 23A, the first connection piece 23 is fastened to a bolt fastening portion 60 provided on the frame 6, which will be described later, together with a first extension piece 31 extending from the first electronic component 3A. With the first connection piece 23 fastened to the bolt fastening portion 60, the first connection piece 23 is fixed to the bolt fastening portion 60 provided on the frame 6 and is electrically and mechanically connected to the first electronic component 3A.

[0020] 2, the second bus bar portion 21 includes a continuous bus bar 24 that is continuous on the same surface as the incoming bus bar 22, and a second connection piece 25 that is bent at the lower end of the continuous bus bar 24 and extends in the opposite direction to the first connection piece 23 (toward the second electronic component 3B) and is electrically connected to the second electronic component 3B. The second connection piece 25 is bolted to the frame 6 using a second bolt B2, and is thereby electrically and mechanically connected to the second electronic component 3B via the second connection bus bar 2C.

[0021] The frame 6 is made of insulating synthetic resin. As shown in Fig. 3, the frame 6 has a plurality of compartments 61 separated by partition walls, and the electronic components 3A, 3B and the bus bars 2A, 2B, 2C, and 2D are fixed to these compartments 61. Hereinafter, among the plurality of compartments 61, the compartment 61 to which the specific bus bar 2A is attached may be referred to as the "specific compartment 61A."

[0022] 3, the specific partition 61A includes an extending wall 62 including a bolt fastening portion 60 (support portion), a plurality of lower partition walls 63 erected downward Z2 from the extending wall 62, and an upper partition wall 64 erected upward Z1 from the extending wall 62 and supporting the entrance bus bar 22 of the specific bus bar 2A. In the specific partition 61A, the extending wall 62 is provided at a position spaced upward Z1 from the lower end of the frame 6.

[0023] 3, the extending wall portion 62 includes a bolt fastening portion 60 (support portion) and a frame communication portion 65 that guides the outside air taken in by a lower ventilation portion 92 provided in the lower cover 9 (described later) upward Z1. The bolt fastening portion 60 and the frame communication portion 65 are arranged side by side in the left-right direction X.

[0024] The bolt fastening portion 60 is configured so that the first bolt B1 is screwed into the bolt fastening portion 60 via the screwing portion 66 when the first extension piece 31 of the first electronic component 3A and the first connection piece 23 of the specific bus bar 2A are overlapped. This allows the specific bus bar 2A and the first electronic component 3A to be bolt fastened to the bolt fastening portion 60.

[0025] 3, the frame communication portion 65 is provided on the side away from the first electronic component 3A (the side closer to the second electronic component 3B) across the bolt fastening portion 60 in the left-right direction X. The frame communication portion 65 is provided below Z2 the first connection piece 23 of the specific busbar 2A, and is provided opposite the first connection piece 23 in the up-down direction Z.

[0026] The frame communication portion 65 is configured to include a frame extension portion 68 that is provided continuous with the bolt fastening portion 60, and a plurality of through holes 68a that are provided in the frame extension portion 68 and that penetrate in the up-down direction Z. The frame extension portion 68 is configured in the shape of a plate that extends in the front-rear direction Y and the left-right direction X. The plurality of through holes 68a are provided side by side in the front-rear direction Y.

[0027] As shown in Figures 1 and 3, the upper cover 8 comprises an upper cover main body 81 (first cover main body) that covers the upper Z1 surface (one surface) of the frame 6, an upper peripheral portion 82 (shown in Figure 1) that extends downward Z2 from the periphery of the upper cover main body 81 and overlaps the periphery of the frame 6, a heat dissipation structure portion 7 provided on the upper cover main body 81, and an upper ventilation portion 83 (first ventilation portion) that is provided on the upper cover main body 81 and communicates with the inside and outside of the box main body 5, and is configured to be assembled to the frame 6 by a first assembly means not shown.

[0028] 3 and 5, the upper cover body 81 includes a first cover portion 810A having a first plate portion 81A, a second cover portion 810B having a second plate portion 81B, and a third cover portion 810C having a third plate portion 81C. The second cover portion 810B includes a second plate portion 81B and a second peripheral plate 81D that is continuous with the periphery of the second plate portion 81B. The heat dissipation structure 7 is surrounded by the first cover portion 810A, the second cover portion 810B, and the third cover portion 810C.

[0029] 3, the first plate portion 81A, the second plate portion 81B, and the third plate portion 81C are each configured as a plate extending in the front-rear direction Y and the left-right direction X. In the up-down direction Z, the first plate portion 81A is provided at approximately the same position as the upper end 22s of the entrance busbar 22, the second plate portion 81B is provided above the first plate portion 81A at a position Z1, and the third plate portion 81C is provided below the first plate portion 81A at a position Z2 and approximately the same position as the lower end 71d of the pressing portion 71.

[0030] As shown in Figures 3 and 5, the heat dissipation structure 7 has a heat dissipation main body 70 in the shape of a frame surrounding the entrance bus bar 22, and a pressing portion 71 and a pressed portion 72 provided on the heat dissipation main body 70 into which the entrance bus bar 22 enters (presses in).

[0031] The pressing portion 71 and the pressed portion 72 are provided opposite each other in the left-right direction X, and are provided with a distance therebetween that allows the entrance bus bar 22 to be press-fitted. That is, the distance between the pressing portion 71 and the pressed portion 72 is configured to be slightly smaller than the plate thickness of the entrance bus bar 22. Furthermore, when the upper cover 8 is attached to the frame 6, the upper end 22s of the entrance bus bar 22 and the first plate portion 81A of the upper cover 8 are provided at approximately the same height in the up-down direction Z.

[0032] As shown in Figures 3 and 4, the pressing portion 71 comprises an arm main body 710 extending downward Z2, and a pressing protrusion 711 provided at the free end of the arm main body 710 and protruding toward the pressed portion 72, and is configured to be able to press the incoming bus bar 22 toward the pressed portion 72.

[0033] 3 and 5, the arm body 710 is formed between a pair of slits 71a, 71a (shown in FIG. 5) that extend upward Z1 by cutting out the lower end of the heat dissipation unit body 70. The upper ends of this pair of slits 71a, 71a are located above the first plate portion 81A of the upper cover body 81 in the Z1 direction.

[0034] As shown in FIG. 4, the pressing protrusion 711 is provided between the first plate portion 81A and the third plate portion 81C of the upper cover main body 81 in the vertical direction Z.

[0035] As shown in Figure 3, the pressed portion 72 has a plate-shaped pressed portion main body 720 arranged opposite the pressing portion 71, and a plurality of fins 721 arranged to protrude from the pressed portion main body 720, and is configured to function as a heat dissipation portion.

[0036] 3, the pressed portion main body 720 is provided to extend in the vertical direction Z, and the upper end 72s of the pressed portion main body 720 is provided to protrude upward Z1 beyond the second plate portion 81B of the upper cover main body 81, and the lower end 72d of the pressed portion main body 720 is provided to extend downward Z2 beyond the third plate portion 81C of the upper cover main body 81. In other words, the pressed portion 72 is provided to protrude upward Z1 from the upper cover main body 81 away from the frame 6. This improves the heat dissipation function of the pressed portion 72.

[0037] The multiple fins 721 are arranged side by side at intervals in the front-rear direction Y. Each fin 721 is provided to protrude in a direction away from the entrance bus bar 22 (left-right direction X), and is provided continuously from the upper end 72s to the lower end 72d of the pressed portion main body 720.

[0038] As shown in Figure 5, the upper ventilation section 83 has a first upper section 83A located inside the heat dissipation section main body 70 and communicating with the inside and outside of the box main body 5, and a second upper section 83B formed by cutting out the first plate section 81A of the upper cover main body 81.

[0039] The first upper portion 83A is formed by a gap that is generated inside the heat dissipation portion main body 70 when the entering bus bar 22 is inserted between the pressing portion 71 and the pressed portion 72.

[0040] 5, the second upper portion 83B is provided on the opposite side of the incoming bus bar 22 with the pressing portion 71 interposed therebetween in the left-right direction X, and also serves as a deflection space for deflecting the pressing portion 71. The second upper portion 83B is provided continuous with a pair of slits 71a, 71a that form the arm main body 710 of the pressing portion 71.

[0041] As shown in FIG. 3, the lower cover 9 includes a plate-shaped lower cover main body 91 that covers the lower Z2 surface (the other surface) of the frame 6, and a lower ventilation section 92 (second ventilation section) formed by cutting out the lower cover main body 91, and is configured to be assembled to the frame 6 by a second assembly means (not shown).

[0042] The lower ventilation section 92 is provided below the frame communication section 65 provided in the frame 6 in a direction Z2. The lower ventilation section 92 and the frame communication section 65 are provided opposite each other in the up-down direction Z. The lower ventilation section 92 is configured with a plurality of through holes 92a that penetrate in the up-down direction Z, and the plurality of through holes 92a are provided side by side in the front-rear direction Y.

[0043] When assembling such an electrical junction box 1, the electronic components 3A and 3B and the bus bars 2B, 2C, and 2D are placed in partitions 61 provided in the frame 6. The specific bus bar 2A is brought close to the specific partition 61A, and the first connection piece 23 is overlapped with the first extension piece 31 extending from the first electronic component 3A. In this state, the first connection piece 23 and the first extension piece 31 are bolted to the bolt fastening portion 60 using a first bolt B1. Furthermore, the second connection piece 25 is bolted to the frame 6 together with the second connection bus bar 2C using a second bolt B2.

[0044] By repeating this process, all of the bus bars 2B, 2C, and 2D, including the specific bus bar 2A, the first electronic component 3A, and the second electronic component 3B are completely assembled to the frame 6. This electrically connects the first electronic component 3A and the second electronic component 3B via the specific bus bar 2A. At this time, the incoming bus bar 22, which is part of the specific bus bar 2A, is disposed between the first electronic component 3A and the second electronic component 3B in the left-right direction X and extends upward Z1.

[0045] Thereafter, when the upper cover 8 is assembled to the frame 6, the upper cover main body 81 is brought close to the frame 6 in a state in which it covers the upper Z1 surface of the frame 6. As a result, the tip of the incoming bus bar 22 approaches the area between the pressing portion 71 and the pressed portion 72 of the heat dissipation structure 7 and enters between them 71, 72. As the entry progresses, the tip of the incoming bus bar 22 abuts against the pressing protrusion 711 of the pressing portion 71. As the entry progresses further, the tip of the incoming bus bar 22 rides over the pressing protrusion 711, and the arm main body 710 becomes bent. At this time, the incoming bus bar 22 is pressed against the pressed portion 72 by the force of the arm main body 710 trying to return to its natural state (elastic restoring force). In this state, i.e., while the entering bus bar 22 is pressed against the pressed portion 72 by the pressing protrusion 711, the entering bus bar 22 continues to enter, and reaches a predetermined position between the pressing portion 71 and the pressed portion 72. At approximately the same time, the upper cover 8 is assembled to the frame 6 by the first assembly means. In this way, assembly of the upper cover 8 to the frame 6 is completed.

[0046] Furthermore, when assembling the lower cover 9 to the frame 6, the lower cover main body 91 is brought close to the frame 6 in a state in which it covers the lower Z2 surface of the frame 6. As a result, the lower ventilation portion 92 is brought close to a position facing the frame communication portion 65 of the frame 6 in the vertical direction Z. As the movement continues, the lower cover 9 is assembled to the frame 6 by the second assembly means, completing the assembly of the lower cover 9 to the frame 6. In this manner, the assembly of the electrical junction box 1 is completed. In this state, as shown in FIG. 3 , the first connection piece 23 of the specific bus bar 2A, the frame communication portion 65 of the frame 6, and the lower ventilation portion 92 of the lower cover 9 are arranged facing each other in the vertical direction Z.

[0047] Next, the function and effect of the electrical junction box 1 will be described.

[0048] In the above-described electrical junction box 1, since the incoming busbar 22 is located between the first electronic component 3A and the second electronic component 3B, heat tends to build up around the incoming busbar 22, and the temperature of the specific busbar 2A rises when power is applied. Here, the incoming busbar 22, which is part of the specific busbar 2A, is pressed against the pressed portion 72 by the elastic restoring force of the pressing portion 71, thereby ensuring a contact area between the incoming busbar 22 and the pressed portion 72, and heat from the incoming busbar 22 is transferred to the pressed portion 72. Furthermore, the pressed portion 72 is configured to have a plurality of fins 721 and function as a heat dissipation portion, and therefore heat from the incoming busbar 22 is dissipated to the outside via the pressed portion 72.

[0049] In addition, external air is taken into the box body 5 through the lower ventilation part 92, and the taken-in air passes through the frame communication part 65, removing heat from inside the box body 5, and is then discharged to the outside of the box body 5 through the upper ventilation part 83. In this way, convection is generated inside the box body 5 from the lower ventilation part 92 through the frame communication part 65 toward the upper ventilation part 83, so that heat from the current-carrying components 4, including the specific bus bar 2A, is transferred to the outside of the box body 5, and a rise in temperature of the current-carrying components 4 is suppressed.

[0050] According to the embodiment described above, the specific bus bar 2A (bus bar) is pressed against the pressed portion 72 by the pressing protrusion 711 of the pressing portion 71. This causes heat from the incoming bus bar 22 to be transferred to the pressed portion 72. By transferring heat from the specific bus bar 2A to the pressed portion 72 in this manner, a temperature rise in the air inside the box main body 5 is suppressed, and a temperature rise in the current-carrying component 4 is suppressed. This makes it possible to suppress a temperature rise in the current-carrying component 4 housed inside the box main body 5 from exceeding the component's allowable temperature.

[0051] Furthermore, the pressed portion 72 is configured to function as a heat dissipation portion, having a plate-shaped pressed portion main body 720 against which the specific bus bar 2A (bus bar) is pressed, and a plurality of fins 721 provided on the pressed portion main body 720 so as to protrude in a direction away from the specific bus bar 2A (left-right direction X). Thus, since the pressed portion 72 has the plate-shaped pressed portion main body 720, the contact area of ​​the entering bus bar 22 with the pressed portion main body 720 is ensured, and heat from the specific bus bar 2A is more efficiently conducted to the pressed portion main body 720 and dissipated to the outside by the plurality of fins 721.

[0052] Furthermore, the pressed portion 72 is provided to protrude from the upper cover main body 81 (first cover main body) in the upward direction Z1 away from the frame 6. This allows the heat of the specific bus bar 2A to be dissipated to the outside more efficiently.

[0053] The box body 5 also has a pair of electronic components 3A, 3B supported by the frame 6, and the specific bus bar 2A (bus bar) is located between the pair of electronic components 3A, 3B. Because the specific bus bar 2A is located between the pair of electronic components 3A, 3B, the temperature rise is significant. However, because the specific bus bar 2A is pressed against the pressed portion 72 by the pressing portion 71, the heat of the specific bus bar 2A is dissipated to the outside via the pressed portion 72, and the rise in temperature of the air inside the box body 5 is efficiently suppressed.

[0054] Furthermore, the box body 5 is configured so that air is taken into the box body 5 through the lower ventilation portion 92, and the air inside the box body 5 is discharged from the upper ventilation portion 83 via the frame communication portion 65. This generates convection inside the box body 5 so that outside air is taken into the box body 5 through the lower ventilation portion 92 and the air inside the box body 5 is discharged to the outside through the upper ventilation portion 83 via the frame communication portion 65, thereby allowing heat generated by the current-carrying components 4 to be discharged to the outside of the box body 5. This suppresses a temperature rise in the air inside the box body 5, and thereby suppresses a temperature rise in the current-carrying components 4.

[0055] The present invention is not limited to the above-described embodiment, but includes other configurations that can achieve the object of the present invention, and the following modifications are also included in the present invention.

[0056] In the above embodiment, the pressed portion 72 includes a pressed portion main body 720 against which the specific bus bar 2A (bus bar) is pressed and a plurality of fins 721 provided on the pressed portion main body 720 so as to protrude in a direction away from the specific bus bar 2A, and is configured to function as a heat dissipation portion. However, the present invention is not limited to this. FIG. 6 is a cross-sectional perspective view showing a modified example of the electric junction box 1. The pressed portion 72A in the modified electric junction box 1A shown in FIG. 6 may have inter-fin ventilation portions 722 communicating between the inside and outside of the box main body 5 between the plurality of fins 721 on the pressed portion main body 720. By providing the inter-fin ventilation portions 722, heat generated by the current-carrying components 4 can be more efficiently discharged to the outside of the box main body 5. This suppresses a temperature rise in the air inside the box main body 5, thereby suppressing a temperature rise in the current-carrying components 4, including the specific bus bar 2A (bus bar).

[0057] In the above embodiment, the pressed portion 72 is configured to function as a heat dissipation portion by including a pressed portion main body 720 against which the specific bus bar 2A (bus bar) is pressed and a plurality of fins 721 provided on the pressed portion main body 720 so as to protrude in a direction away from the specific bus bar 2A, but the present invention is not limited to this. The pressed portion 72 may be configured to include a plate-shaped pressed portion main body 720 against which the specific bus bar 2A is pressed, and the plurality of fins 721 may be omitted. In this case, the pressed portion main body 720 may be configured to be able to come into surface contact with the incoming bus bar 22. This results in a slightly lower heat dissipation performance than the above embodiment, but provides substantially the same effects as the above embodiment.

[0058] Although the best configurations and methods for carrying out the present invention have been disclosed above, the present invention is not limited thereto. That is, although the present invention has been particularly illustrated and described mainly with reference to specific embodiments, those skilled in the art can make various modifications to the above-described embodiments in terms of shape, material, quantity, and other detailed configurations without departing from the scope of the technical idea and purpose of the present invention. Therefore, the above-disclosed descriptions limiting the shape, material, etc. are provided as examples to facilitate understanding of the present invention and are not intended to limit the present invention. Therefore, descriptions using names of components that are free from some or all of the limitations on shape, material, etc. are included in the present invention. [Explanation of symbols]

[0059] 1. 1A Electrical Junction Box 2A Specific bus bar (bus bar) 22 Entrance bus bar 23 First connecting piece (extension bus bar) 3A, 3B A pair of electronic components 4. Current-carrying parts 5 Boxes 6 frames 60 Bolt fastening part (support part) 65 Frame connection part 71 Pressing part 711 Pressing protrusion 72, 72A Pressurized part 720 Pressed part body 721 Multiple Fins 722 Ventilation between fins 8 Upper cover (first cover) 81 Upper cover body (first cover body) 83 Upper ventilation section (first ventilation section) 9 Lower cover (second cover) 92 Lower ventilation section (second ventilation section)

Claims

1. The electrical wiring board includes an electrical wiring part including a bus bar, and a box body that houses the electrical wiring part. the box body includes a plate-shaped frame having a support portion for supporting the bus bar, and a first cover attached to the frame; the first cover includes a plate-shaped first cover body that covers one surface of the frame, a pressing portion that is provided on the first cover body and that can press the bus bar, and a pressed portion that is provided on the opposite side of the pressing portion across the bus bar, the pressing portion includes a cantilevered arm body and a pressing protrusion provided at a free end of the arm body, The bus bar is pressed against the pressed portion by the pressing protrusion.

2. 2. The electrical connection box according to claim 1, wherein the pressure-receiving portion has a plate-shaped pressure-receiving portion main body against which the bus bar is pressed, and a plurality of fins arranged on either side of the pressure-receiving portion main body and protruding in a direction away from the bus bar, and is configured to function as a heat dissipation portion.

3. 3. The electrical junction box according to claim 1, wherein the pressed portion is provided so as to protrude from the first cover body in a direction away from the frame.

4. the current-carrying component includes a pair of electronic components supported by the frame, 2. The electrical junction box according to claim 1, wherein the bus bar is provided between the pair of electronic components.

5. a second cover that is attached to the frame and is provided on the opposite side of the frame from the first cover, the bus bar is formed to extend in a direction intersecting the frame and includes: a plate-shaped entering bus bar that can enter between the pressing portion and the pressed portion; and an extending bus bar that is provided continuously with the entering bus bar, bent and extended, and supported by the support portion, the first cover has a first ventilation portion communicating with the inside and outside of the box body, the frame is provided on the opposite side of the incoming bus bar across the extending bus bar, and has a frame communication portion that communicates in the extending direction of the incoming bus bar, the second cover is provided at a position opposite the frame communication portion and has a second ventilation portion communicating with the inside and outside of the box body, 2. The electrical connection box according to claim 1, wherein air is taken into the interior of the box body through the second ventilation portion, and the air inside the box body is discharged through the first ventilation portion via the frame communication portion.

6. the pressed portion has a plate-shaped pressed portion main body against which the bus bar is pressed, and a plurality of fins provided to sandwich the pressed portion main body and protrude in a direction away from the bus bar, and is configured to function as a heat dissipation portion; 2. The electrical junction box according to claim 1, wherein an inter-fin ventilation section communicating the inside and outside of the box body is provided between the plurality of fins on the pressed portion body.

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