Heat radiation body and box-shaped body

Abstract

To provide a heat radiation body having an excellent heat radiation performance.SOLUTION: A heat radiation body 30 that radiates heat generated by a heat source includes: a base portion 32 to which the heat is transferred; heat radiation fins 37a, 37b, 37c provided on the base portion 32; and wall portions 35, 34a, 34b provided on the base portion 32 and adjacent to the heat radiation fins 37a, 37b, 37c in a direction in which the heat radiation fins 37a, 37b, 37c extend. The wall portions 35, 34a, 34b have through holes 38a, 38b, 38c which open in faces of the wall portions 35, 34a, 34b that face the heat radiation fins 37a, 37b, 37c in the direction and pass through the wall portions 35, 34a, 34b. At least one of the plurality of through holes 38a, 38b, 38c opens in a position adjacent to a gap sandwiched between a pair of adjacent heat radiation fins 37a, 37b, 37c in the direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a heat radiator that radiates heat generated by a heat source, and a box-shaped body that includes the heat radiator as at least a part of its outer wall. [Background technology]

[0002] Electrical junction boxes mounted on vehicles, etc. have been proposed for some time. For example, one conventional electrical junction box accommodates electronic components, bus bars, etc. in its internal space to prevent accidental contact with these electronic components, etc. (See, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-240217 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-described type of electrical junction box may include heat dissipation fins for dissipating heat generated by electronic components during operation to the outside. However, if a power input terminal, which electrically connects the inside and outside of the electrical junction box for power supply, is located near the heat dissipation fins, the power input terminal itself or a base portion to which the power input terminal is fixed may obstruct the airflow along the heat dissipation fins, thereby impairing the heat dissipation performance of the electrical junction box. From the perspective of ensuring proper operation of the electrical junction box, it is desirable to improve the heat dissipation performance of the electrical junction box. As can be understood from the above description, it is desirable to improve the heat dissipation performance not only of electrical junction boxes but also of box-shaped structures capable of accommodating a heat source within its internal space. For these reasons, a heat dissipator with excellent heat dissipation performance that can be applied to box-shaped structures is desired.

[0005] An object of the present invention is to provide a heat sink having excellent heat dissipation performance, and a box-shaped body using the heat sink. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the heat sink and box-shaped body according to the present invention have the following features.

[0007] A heat sink that dissipates heat generated by a heat source, a base to which the heat is transferred, a heat dissipation fin provided on the base, and a wall provided on the base adjacent to the heat dissipation fin in an extension direction of the heat dissipation fin, The wall portion is a through hole that opens on a surface of the wall portion facing the heat dissipation fin in the direction and penetrates the wall portion; It must be a heat dissipator.

[0008] A box-shaped body capable of accommodating a heat source in an internal space, The above-mentioned heat dissipation body is provided as at least a part of the outer wall of the box-shaped body. It is box-shaped. [Effects of the Invention]

[0009] According to the heat sink of the present invention, the wall portion adjacent to the heat sink fin in the direction of extension of the heat sink fin has a through-hole that opens on the wall surface facing the heat sink fin and penetrates the wall portion. This allows air flowing along the heat sink fin to pass through the through-hole, even if a wall portion is present near the heat sink fin, and the air flow is less likely to be obstructed by the wall portion. Therefore, even when the wall portion and the heat sink fin are arranged in close proximity, such as when the wall portion and the heat sink fin are integrally formed on a base for use as a pedestal for fixing a power input terminal, heat can be efficiently dissipated from the heat sink fin. Therefore, the heat sink of the present invention has excellent heat dissipation performance.

[0010] According to the box-shaped body of the present invention, by providing the above-mentioned heat dissipation body as at least a part of the outer wall of the box-shaped body, the heat generated by the heat source inside the box-shaped body can be efficiently dissipated to the outside of the box-shaped body. Therefore, the box-shaped body of the present invention has excellent heat dissipation performance.

[0011] The present invention has been briefly described above. The details of the present invention will become clearer by reading the detailed description of the invention below in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing a box-shaped body according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of the box-shaped body shown in FIG. 1 as seen from the rear side. [Figure 3] FIG. 3 is an exploded perspective view of the box-shaped body shown in FIG. [Figure 4] FIG. 4 is an enlarged top view of part A in FIG. [Figure 5] 5 is a perspective view of the periphery of the base portion and the bolt mounting portion included in part A in FIG. 3, as viewed obliquely from below and behind. DETAILED DESCRIPTION OF THE INVENTION

[0013] <Embodiment> Hereinafter, a box-shaped body 1 according to an embodiment of the present invention will be described with reference to the drawings. The box-shaped body 1 accommodates various electronic components such as relays and fuses inside, and therefore can also be called an electronic component unit or an electrical junction box.

[0014] As shown in Figures 1 to 3, the box-shaped body 1 includes a circuit board 10, and a cover 20 and a case 30 that are arranged to sandwich the circuit board 10 from above and below and define an internal storage space for storing the circuit board 10. The box-shaped body 1 is typically attached to a dash panel that separates the engine room and passenger compartment (cabin) of a vehicle, and is used with the cover 20 exposed to the engine room of the vehicle. The case 30 corresponds to the "case" of the present invention, and the cover 20 corresponds to the "cover" of the present invention.

[0015] For the sake of convenience, the following definitions are used for the "front-rear direction," "up-down direction," "left-right direction," "front," "rear," "up," "down," "left," and "right" as shown in FIG. 1 and elsewhere. The "front-rear direction," "up-down direction," and "left-right direction" are perpendicular to one another. The up-down direction corresponds to the "direction in which the heat dissipation fins extend" in the present invention, and the left-right direction corresponds to the "direction intersecting the direction in which the heat dissipation fins extend" in the present invention. As will be described later, from the perspective of smoothly flowing air along the heat dissipation fins 37, it is preferable that the "up-down direction" in this example coincides with the up-down direction of the vehicle or the like when the box-shaped body 1 is mounted on the vehicle or the like. However, the "up-down direction" in this example does not necessarily correspond to the up-down direction of the vehicle or the like when the box-shaped body 1 is mounted on the vehicle or the like. Below, each component constituting the box-shaped body 1 will be described.

[0016] First, we will explain the circuit board 10. The circuit board 10 is a printed circuit board (PCB) on which various electronic components (not shown), such as relays and fuses, are mounted, and in this example, has a rectangular flat plate shape as shown in FIG.

[0017] Next, the cover 20 will be described. The cover 20 is a resin molded body and has a generally rectangular flat plate shape as shown in FIG. 3. The cover 20 constitutes a part of the outer wall of the box-shaped body 1. A connector portion 21 having a cylindrical portion extending forward (toward the outside of the box-shaped body 1) is provided at each of a plurality of locations on the front surface of the cover 20 (the surface exposed to the outside of the box-shaped body 1). Each connector portion 21 houses a metal terminal (not shown) electrically connected to a corresponding electronic component mounted on the circuit board 10. Each connector portion 21 is fitted with a mating connector (not shown) connected to an end of an electric wire extending from a device (not shown) outside the box-shaped body 1. As a result, each connector portion 21 functions to electrically connect the electronic component mounted on the circuit board 10 inside the box-shaped body 1 with the device outside the box-shaped body 1. Each connector portion 21 can be fitted with a mating connector in a watertight manner and has a waterproof function that can prevent water from entering from the outside when fitted with the mating connector. At each of the four corners of the periphery of the cover 20, a bolt insertion hole 22 is provided that penetrates the cover 20 in the thickness direction (front-rear direction).

[0018] Next, the case 30 will be described. The case 30 is made of metal (more specifically, aluminum die-cast) and functions as a heat sink, absorbing heat generated by various electronic components mounted on the circuit board 10 and releasing it to the outside. In this example, as shown in FIG. 3 , the case 30 has a generally rectangular box-like shape with an open front end, and integrally includes a generally rectangular cylindrical peripheral wall 31 extending in the front-rear direction and a generally rectangular flat bottom wall 32 closing the rear end opening of the peripheral wall 31. The case 30 (= peripheral wall 31 + bottom wall 32) forms a part of the outer wall of the box-shaped body 1. The circuit board 10 is placed on the inner surface (front surface) of the bottom wall 32 and fixed thereto by fastening or the like. Here, the case 30 corresponds to the "heat sink" of the present invention, and the bottom wall 32 corresponds to the "base" of the present invention.

[0019] A generally rectangular, annular recessed streak 33 is formed in the end face of the generally rectangular frame-shaped opening (front side) of the peripheral wall 31. The recessed streak 33 is recessed rearward and extends circumferentially around the entire circumference of the peripheral wall 31. A sealing material (e.g., a liquid gasket) is poured into the recessed streak 33. As shown in FIG. 2 and other figures, bolt mounting portions 34 having an outer shape that protrudes from the bottom wall 32 to the rear (outside the box-shaped body 1) are provided in the peripheral wall 31 and bottom wall 32 at each of the four corners of the periphery of the case 30, corresponding to each of the four bolt insertion holes 22 of the cover 20. A female thread is formed inside the bolt mounting portion 34 and opens to the front (toward the cover 20). The cover 20 is placed on the end surface of the peripheral wall 31 on the opening side so as to close the front-end opening of the case 30. The cover 20 is fastened to the case 30 by threading bolts (not shown) inserted through the bolt insertion holes 22 into the corresponding female threads of the bolt mounting portions 34. When the cover 20 is completely assembled to the case 30, the sealant injected into the grooves 33 seals the gap between the peripheral edges of the fixed cover 20 and case 30, thereby preventing water from entering the box-shaped body 1 from the outside to the inside. Hereinafter, for ease of explanation, of the four bolt mounting portions 34, the one located at the upper right corner of the case 30 will be referred to as the "bolt mounting portion 34a," and the one located at the upper left corner of the case 30 will be referred to as the "bolt mounting portion 34b." The bolt mounting portions 34 can also be used as locations for attaching a jig (a so-called bracket) for mounting the box-shaped body 1 on a vehicle or the like.

[0020] As shown in FIG. 2 and other figures, a pedestal 35 having an outer shape that protrudes rearward (outside the box-shaped body 1) from the bottom wall 32 is provided on the peripheral wall 31 and bottom wall 32 at a position on the upper edge extending in the left-right direction of the case 30, adjacent to the left side of the bolt mounting portion 34a. A power input terminal 36 electrically connected to various electronic components mounted on the circuit board 10 is fixed to the pedestal 35. A mating terminal (not shown) provided at the end of an electric wire extending from a power source (not shown) external to the box-shaped body 1 is connected to the power input terminal 36. As a result, power supplied from the power source is supplied to the various electronic components mounted on the circuit board 10 via the power input terminal 36. Here, the bolt mounting portions 34a and 34b correspond to the "wall portion" and "mounting portion" of the present invention, and the pedestal 35 corresponds to the "wall portion" and "pedestal" of the present invention.

[0021] 2 and other figures, a plurality of heat dissipation fins 37 are provided on the substantially rectangular rear surface (outer surface of the box-shaped body 1) of the bottom wall 32 of the case 30, excluding the areas where convex portions such as the four bolt mounting portions 34 and the pedestal portion 35 protruding outward (rearward) from the bottom wall 32 are arranged, extending vertically and equidistantly in the left-right direction. The heat dissipation fins 37 improve the heat dissipation performance of the case 30, which functions as a heat sink.

[0022] For ease of explanation, of the multiple heat dissipation fins 37, the multiple (seven in this example) fins located at the bottom of the base portion 35 protruding outward from the upper edge of the bottom wall portion 32 and arranged adjacent to (facing) the underside of the base portion 35 in the vertical direction will be referred to as "heat dissipation fins 37a" (see Figures 2 and 5), the multiple (three in this example) fins located at the bottom of the bolt mounting portion 34a protruding outward from the upper edge of the bottom wall portion 32 and arranged adjacent to (facing) the underside of the bolt mounting portion 34a in the vertical direction will be referred to as "heat dissipation fins 37b" (see Figures 2 and 5), and the multiple (three in this example) fins located at the bottom of the bolt mounting portion 34b protruding outward from the upper edge of the bottom wall portion 32 and arranged adjacent to (facing) the underside of the bolt mounting portion 34b in the vertical direction will be referred to as "heat dissipation fins 37c" (see Figure 2). The upper ends of the seven heat dissipation fins 37a are adjacent to the lower surface of the base 35 and are aligned vertically. The upper ends of the three heat dissipation fins 37b are adjacent to the lower surface of the bolt mounting portion 34a and are aligned vertically. The upper ends of the three heat dissipation fins 37c are adjacent to the lower surface of the bolt mounting portion 34b and are aligned vertically.

[0023] 2, 4, and 5, the base 35 is provided with a plurality of (four in this example) through-holes 38a that open on the underside thereof and penetrate the base 35 in the up-down direction, aligned at intervals in the left-right direction. The four through-holes 38a are arranged such that, when viewed from below, at least a portion of the lower end opening of each of the four through-holes 38a overlaps one or two adjacent gaps between a pair of adjacent heat dissipation fins 37a. In other words, the four through-holes 38a open into the gaps between a pair of adjacent heat dissipation fins 37a at positions adjacent to each other in the up-down direction.

[0024] The bolt mounting portion 34a is provided with one through-hole 38b that opens to its lower surface and passes through the bolt mounting portion 34a in the vertical direction. When viewed from below, one through-hole 38b is positioned so that at least a portion of its lower end opening overlaps one gap between a pair of adjacent heat dissipation fins 37b. In other words, one through-hole 38b opens into the gap between a pair of adjacent heat dissipation fins 37b at a position adjacent to the gap in the vertical direction.

[0025] The bolt mounting portion 34b is provided with one through-hole 38c that opens to its lower surface and passes through the bolt mounting portion 34b in the up-down direction (see FIG. 2). When viewed from below, one through-hole 38c is positioned so that at least a portion of its lower end opening overlaps one gap between a pair of adjacent heat dissipation fins 37c. In other words, one through-hole 38c opens into the gap between a pair of adjacent heat dissipation fins 37c at a position adjacent to the gap in the up-down direction.

[0026] The following describes the effects of providing through holes 38a, 38b, and 38c in base 35, bolt mounting portion 34a, and bolt mounting portion 34b, respectively. Heat generated from the various electronic components mounted on circuit board 10 is absorbed by peripheral wall 31 and bottom wall 32 of case 30, which function as heat sinks, and is released to the outside through the outer surfaces of peripheral wall 31 and bottom wall 32. At that time, the air present in the gaps between the multiple heat dissipation fins 37 receives the heat released from bottom wall 32 and the outer surfaces of heat dissipation fins 37, making its temperature higher than that of the surrounding air (i.e., its density becomes relatively lower), and therefore flows upward along heat dissipation fins 37 extending in the vertical direction.

[0027] Of the multiple heat dissipation fins 37, air flowing upward through the gaps between the heat dissipation fins 37 other than the heat dissipation fins 37a, 37b, and 37c (i.e., the heat dissipation fins 37 that do not have convex portions such as the bolt mounting portion 34 and the base portion 35 above the heat dissipation fins 37) can move upward from the upper end of the heat dissipation fins 37 (i.e., above the box-shaped body 1) without being obstructed from flowing upward.

[0028] On the other hand, air flowing upward through the gaps between the heat dissipation fins 37a may be blocked from the upper ends of the heat dissipation fins 37a due to collision with the base 35 or the like. In this regard, in this example, the four through holes 38a are formed in the base 35. Therefore, as shown in FIG. 5 , air flowing upward through the gaps between the heat dissipation fins 37a and into the region Sa between the heat dissipation fins 37a and the base 35 can pass upward through the through holes 38a in the base 35, as indicated by the white arrows in the figure. As described above, since each of the four through holes 38a opens at a vertically adjacent position in the gap between a pair of adjacent heat dissipation fins 37a, the air flowing into the region Sa can smoothly flow into the through holes 38a. Thus, even if the base 35 is present near the upper ends of the heat dissipation fins 37a, the upward flow of air flowing into the region Sa is not blocked, and heat dissipation performance is not easily impaired.

[0029] Similarly, air flowing upward through the gaps between the heat dissipation fins 37b may be blocked from the upper ends of the heat dissipation fins 37b by, for example, colliding with the bolt mounting portion 34a. In this regard, in this embodiment, the bolt mounting portion 34a is provided with the single through-hole 38b. Therefore, as shown in FIG. 5, air flowing upward through the gaps between the heat dissipation fins 37b and into the region Sb between the heat dissipation fin 37b and the bolt mounting portion 34a can pass upward through the through-hole 38b in the bolt mounting portion 34a, as indicated by the white arrows in the figure. Since the through-holes 38b open at vertically adjacent positions in the gaps between a pair of adjacent heat dissipation fins 37b, the air flowing into the region Sb can smoothly flow into the through-hole 38b. In this way, even if the bolt attachment portion 34a is present near the upper end of the heat dissipation fin 37b, the upward flow of air that has flowed into the region Sb is unlikely to be impeded, and therefore the heat dissipation performance is unlikely to be impaired.

[0030] Similarly, air flowing upward through the gaps between the heat dissipation fins 37c may be blocked from the upper end of the heat dissipation fin 37c due to collision with the bolt mounting portion 34b, etc. In this regard, in this example, the bolt mounting portion 34b is formed with the single through-hole 38c (see FIG. 2). Therefore, air flowing upward through the gaps between the heat dissipation fins 37c and into the region Sc (see FIG. 2) between the heat dissipation fin 37c and the bolt mounting portion 34b can pass upward through the through-hole 38c in the bolt mounting portion 34b, as indicated by the white arrow in the figure. In this case, since the through-hole 38c opens at vertically adjacent positions in the gaps between a pair of adjacent heat dissipation fins 37c, the air flowing into the region Sc can smoothly flow into the through-hole 38c. In this way, even if the bolt attachment portion 34b is present near the upper end of the heat dissipation fin 37c, the upward flow of air that has flowed into the area Sc is unlikely to be impeded, and therefore the heat dissipation performance is unlikely to be impaired.

[0031] <Actions and Effects> As described above, according to the heat sink (case 30) and box-shaped body 1 of this embodiment, the wall portion (base portion 35, bolt mounting portions 34a, 34b) arranged adjacent to the heat dissipation fins 37a, 37b, 37c in the direction in which the heat dissipation fins 37a, 37b, 37c extend (up and down direction) has through holes 38a, 38b, 38c that open to the surface (underside) of the wall portion facing the heat dissipation fins 37a, 37b, 37c in the direction in which the heat dissipation fins 37a, 37b, 37c extend and penetrate the wall portion. As a result, air flowing along the heat dissipation fins 37a, 37b, and 37c can pass through the through-holes 38a, 38c, and 38c of the walls 35, 34a, and 35b. Therefore, even if the walls 35, 34a, and 34b are located near the heat dissipation fins 37a, 37b, and 37c, as in this example, the heat dissipation fins 37a, 37b, and 37c are arranged in close proximity to the base 35 that secures the power input terminal 36 and the wall portions used for the bolt mounting portions 34a and 34b. Therefore, heat can be efficiently dissipated from the heat dissipation fins 37a, 37b, and 37c. Therefore, the heat dissipation body 30 and the box-shaped body 1 according to this embodiment have excellent heat dissipation performance.

[0032] Furthermore, at least one of the through holes 38a, 38b, and 38c opens in a gap between a pair of adjacent heat dissipation fins 37a, 37b, and 37c at a position adjacent to the extension direction of the heat dissipation fins 37a, 37b, and 37c. This allows air flowing through the gap to smoothly flow into the through holes 38a, 38b, and 38c. This improves the heat dissipation performance of the heat dissipation body 30.

[0033] Furthermore, since there is another wall portion (bolt mounting portion 34a) located adjacent to the wall portion (base portion 35) in a direction (left-right direction) intersecting the extension direction of the heat dissipation fins 37a, 37b, 37c, even if it is difficult for the air flowing along the heat dissipation fin 37a to flow around the wall portion 35, the air can pass through the through holes 38a, 38b in the wall portions 35, 34a, thereby improving the heat dissipation performance of the heat sink 30.

[0034] Furthermore, by providing the through holes 38a, 38b, and 38c, the weight of the box-shaped body 1 can be reduced.

[0035] <Other aspects> It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. are possible as appropriate. Furthermore, the material, shape, dimensions, number, location, etc. of each component in the above-described embodiments are arbitrary as long as they can achieve the present invention, and are not limited thereto.

[0036] Here, the features of the embodiments of the heat sink 30 and the box-shaped body 1 according to the present invention described above will be briefly summarized and listed below in [1] to [6].

[0037] [1] A heat sink (30) that dissipates heat generated by a heat source, a base (32) to which the heat is transferred, heat dissipation fins (37a, 37b, 37c) provided on the base (32), and wall portions (35, 34a, 34b) provided on the base (32) adjacent to the heat dissipation fins (37a, 37b, 37c) in an extension direction of the heat dissipation fins (37a, 37b, 37c), The wall portions (35, 34a, 34b) are through holes (38a, 38b, 38c) that open on the surfaces of the wall portions (35, 34a, 34b) facing the heat dissipation fins (37a, 37b, 37c) in the direction and penetrate the wall portions (35, 34a, 34b); Heat sink (30).

[0038] According to the heat sink having the configuration [1] above, the wall portion adjacent to the heat sink fin in the direction of extension of the heat sink fin has a through-hole that opens on the wall surface facing the heat sink fin and penetrates the wall portion. This allows air flowing along the heat sink fin to pass through the through-hole, even if a wall portion is present near the heat sink fin, making the air flow less likely to be obstructed by the wall portion. Therefore, even when the wall portion and the heat sink fin are closely arranged, such as when the wall portion and the heat sink fin are integrally formed on a base for use as a pedestal for fixing a power input terminal, heat can be efficiently dissipated from the heat sink fin. Therefore, the heat sink having this configuration has excellent heat dissipation performance.

[0039] [2] In the heat sink (30) described in [1] above, a plurality of the heat dissipation fins (37a, 37b, 37c) and a plurality of the through holes (38a, 38b, 38c), At least one of the plurality of through holes (38a, 38b, 38c) The heat dissipation fins (37a, 37b, 37c) are opened at positions adjacent to each other in the direction in the gap between the pair of adjacent heat dissipation fins (37a, 37b, 37c). Heat sink (30).

[0040] According to the heat sink having the configuration [2] above, at least one of the through holes is located adjacent to the gap between a pair of adjacent heat sink fins. This allows air flowing through the gap to smoothly flow into the through hole, thereby improving the heat dissipation performance of the heat sink.

[0041] [3] The heat sink (30) according to the above [1], Further, another wall portion (34a) is provided at a position adjacent to the wall portion (35) in a direction intersecting the above direction. Heat sink (30).

[0042] According to the heat sink having the configuration [3] above, even if the air flowing along the heat sink fins has difficulty flowing around the wall due to the presence of another wall adjacent to the wall, the air can pass through the through holes in the wall, thereby improving the heat dissipation performance of the heat sink.

[0043] [4] A box-shaped body (1) capable of accommodating a heat source in its internal space, The heat dissipation body (30) according to any one of [1] to [3] above is provided as at least a part of the outer wall of the box-shaped body (1). Box (1).

[0044] According to the box-shaped body of the configuration [4] above, by providing the heat dissipation body as at least a part of the outer wall of the box-shaped body, the heat generated by the heat source inside the box-shaped body can be efficiently dissipated to the outside of the box-shaped body. Therefore, the box-shaped body of this configuration has excellent heat dissipation performance.

[0045] [5] In the box-shaped body (1) described in [4] above, The wall portion of the heat dissipation body (30) is a base portion (35) on which a terminal (36) for electrically connecting the inside and outside of the box-shaped body (1) can be fixed; Box (1).

[0046] According to the box-shaped body of the configuration [5] above, the wall of the heat sink is used as a base to which terminals that electrically connect the inside and outside of the box-shaped body can be fixed, so that the base is less likely to interfere with heat dissipation.

[0047] [6] The box-shaped body (1) described in [4] above, The device includes a case (30) and a cover (20) that define the internal space, The wall portion of the heat dissipation body (30) is mounting portions (34a, 34b) to which a fastener for fastening the cover (20) to the case (30) can be attached; Box (1).

[0048] According to the box-shaped body of the configuration [6] above, the wall of the heat sink is used as a mounting part to which a fastener that fastens the case and cover that constitute the box-shaped body can be attached. For example, when a bolt is used as a fastener, even if the mounting part for providing the bolt fastening hole is provided near the heat dissipation fin, the mounting part is unlikely to hinder heat dissipation. [Explanation of symbols]

[0049] 1 Box-shaped body 20 Cover 30 Case (heat sink) 32 Bottom wall (base) 34a Bolt mounting part (wall part, mounting part) 34b Bolt mounting part (wall part, mounting part) 35 Base (wall) 36 Power input terminal (terminal) 37a Heat dissipation fin 37b Heat dissipation fin 37c Heat dissipation fin 38a through hole 38b Through hole 38c through hole

Claims

1. A heat sink that dissipates heat generated by a heat source, a base to which the heat is transferred, a heat dissipation fin provided on the base, and a wall provided on the base adjacent to the heat dissipation fin in an extension direction of the heat dissipation fin, The wall portion is a through hole that opens on a surface of the wall portion facing the heat dissipation fin in the direction and penetrates the wall portion; Heat sink.

2. The heat sink according to claim 1, a plurality of the heat dissipation fins and a plurality of the through holes; At least one of the plurality of through holes is The heat dissipation fins are opened at positions adjacent to each other in the direction in the gap between the pair of adjacent heat dissipation fins. Heat sink.

3. The heat sink according to claim 1, Further, another wall portion is provided at a position adjacent to the wall portion in a direction intersecting the direction. Heat sink.

4. A box-shaped body capable of accommodating a heat source in an internal space, The heat sink according to any one of claims 1 to 3 is provided as at least a part of the outer wall of the box-shaped body. Box-shaped body.

5. The box-shaped body according to claim 4, The wall portion of the heat sink is a base portion capable of fixing a terminal for electrically connecting the inside and outside of the box-shaped body; Box-shaped body.

6. The box-shaped body according to claim 4, a case and a cover that define the internal space; The wall portion of the heat sink is a mounting portion to which a fastener for fixing the cover to the case can be attached; Box-shaped body.

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