Coil device and onboard device

Abstract

A coil device (20) compries: a coil (23) that is wound around a central axis; and a casing (21) that is a casting or an injection-molded article having a cavity therein, the casing (21) accommodating the coil (23) in the cavity. The casing (21) is accommodated in a duct (11), which extends in a direction intersecting the vertical direction inside the housing of an onboard device and forms a space into which air outside the housing flows, in a state in which at least a portion of the bottom surface (21a) of the casing (21) is in contact with a first wall surface (11a) that is the inner surface on the vertically lower side of the duct (11). The casing (21) is fixed to the first wall surface (11a) and a second wall surface (11b) that is the inner surface on the vertically upper side of the duct (11).

Description

Coil devices and in-vehicle equipment

[0001] The present disclosure relates to a coil device and an in-vehicle device including the coil device.

[0002] Some in-vehicle equipment includes a coil device such as a reactor or transformer. To prevent damage to the coil device due to heat generated when current is applied, the in-vehicle equipment has a structure that dissipates heat generated by the coil device. An example of this type of in-vehicle equipment is disclosed in Patent Document 1. The choke coil of the inverter circuit included in the electric motor disclosed in Patent Document 1 is installed at the bottom of a structural member suspended from the motor housing. The heat generated by the choke coil is dissipated to the outside of the electric motor via the structural member and the motor housing.

[0003] Japanese Patent Application Laid-Open No. 2018-026508

[0004] Compared to on-board equipment for automobiles, on-board equipment for railway vehicles requires a larger current to flow through its main circuit, and therefore requires a reactor with a larger capacity. In other words, the size and weight of the coil device provided in on-board equipment for railway vehicles are larger than those provided in on-board equipment for automobiles. Therefore, in order to install the electric motor disclosed in Patent Document 1 in a railway vehicle, the thickness of the portion of the motor housing from which the structural member is suspended must be increased, and the structural member must be more firmly attached to the motor housing. This increases the overall size of the electric motor device. This issue is not limited to motor devices, but can occur in any on-board equipment equipped with a coil device.

[0005] The present disclosure has been made in view of the above circumstances, and aims to provide a coil device that enables miniaturization of the in-vehicle equipment to be mounted thereon, and a compact in-vehicle equipment.

[0006] To achieve the above object, the coil device of the present disclosure includes a coil and a casing. The coil is wound around a central axis. The casing is a cast or injection-molded product having an internal cavity, and the coil is housed in the cavity. The casing is housed in a duct that extends in a direction intersecting the vertical direction inside a housing of an in-vehicle device and forms a space into which air outside the housing flows, with at least a portion of the bottom surface of the casing abutting against a first wall surface that is the inner surface of the duct on the lower side in the vertical direction. The casing is fixed to the first wall surface and a second wall surface that is the inner surface of the duct on the upper side in the vertical direction.

[0007] According to the coil device of the present disclosure, the casing, which is a cast or injection-molded product that houses the coil, is fixed to the first wall surface, which is the inner surface of the duct on the lower side in the vertical direction, with at least a portion of the bottom surface of the casing abutting against the first wall surface. The casing is also fixed to the second wall surface, which is the inner surface of the duct on the upper side in the vertical direction. Therefore, a member for supporting the coil, such as a structural member suspended from a housing to support the coil, is not required. This makes it possible to miniaturize on-board equipment that includes the coil device.

[0008] 1 of the in-vehicle device according to the first embodiment; sectional view taken along line II-II in FIG. 1 of the in-vehicle device according to the first embodiment; sectional view taken along line III-III in FIG. 2 of the in-vehicle device according to the first embodiment; sectional view of the coil device according to the first embodiment; sectional view of the in-vehicle device according to the second embodiment; sectional view of the in-vehicle device according to the second embodiment;

[0009] Hereinafter, a coil device and an in-vehicle device according to an embodiment of the present disclosure will be described in detail with reference to the drawings, in which the same or equivalent parts are designated by the same reference numerals.

[0010] (Embodiment 1) In Embodiment 1, an on-board device 1 will be described using an on-board device mounted on a railway vehicle as an example. The on-board device 1 shown in Fig. 1, Fig. 2 which is a cross-sectional view taken along line II-II in Fig. 1, and Fig. 3 which is a cross-sectional view taken along line III-III in Fig. 2 is attached to a railway vehicle and includes a housing 10 having a duct 11 therein. The on-board device 1 includes a coil device 20 housed in the duct 11, a first fastening member 31 and a second fastening member 32 which fix the coil device 20 to the duct 11, and a heat receiving block 41 which forms part of the duct 11.

[0011] The heat receiving block 41 has a first main surface 41a facing the inside of the duct 11 and a second main surface 41b located on the opposite side of the first main surface 41a. In the first embodiment, the on-vehicle device 1 includes an electronic component 42 attached to the second main surface 41b and a heat dissipation member 43 housed in the duct 11. In Figures 1 to 3, the Z axis indicates the vertical direction when the railway vehicle is positioned horizontally. The X axis indicates the direction of travel of the railway vehicle, and the Y axis indicates the width direction of the railway vehicle. The X axis, Y axis, and Z axis are perpendicular to one another.

[0012] The on-board device 1 is, for example, a power conversion device that converts power supplied from an overhead line into three-phase AC power for supplying to an electric motor that generates propulsion power for a railway vehicle, and supplies the three-phase AC power to the traction motor. The coil device 20 provided in the on-board device 1, which is a power conversion device, is, for example, a reactor that generates heat when current is applied, and is housed in the duct 11. The heat generated by the coil device 20 is dissipated into air flowing from the outside of the housing 10 into the duct 11, thereby cooling the coil device 20. Because the casing 21 of the coil device 20 is fixed to the duct 11, there is no need to provide an additional member for supporting the coil device 20, and the on-board device 1 can be made smaller.

[0013] Each part of the on-board device 1 will now be described in detail. The housing 10 is attached to the underfloor of the railway vehicle by means of mounting members (not shown). Ventilation holes 10a and 10b communicating with the duct 11 are formed on two opposing sides of the housing 10 in the Y-axis direction. The ventilation holes 10a and 10b are formed at positions opposing each other in the Y-axis direction.

[0014] The duct 11 extends inside the housing 10 in a direction intersecting the vertical direction to form a space into which air outside the housing 10 flows in. In the first embodiment, the duct 11 extends horizontally when the railway vehicle on which the on-vehicle device 1 is mounted is positioned horizontally. The duct 11 houses the coil device 20 and the heat dissipation member 43. The duct 11 is supported by a support member 12 attached to the inner surface of the housing 10.

[0015] In the first embodiment, the duct 11 is formed by a duct lower portion 13 having a portion perpendicular to the Z axis and a portion perpendicular to the Y axis, and a part of the heat receiving block 41 .

[0016] The duct 11 has a lower duct portion 13 that vertically supports the coil device 20 housed in the duct 11. The duct 11 has a strength sufficient to prevent deformation due to vibrations caused by the running of the railway vehicle. Specifically, the lower duct portion 13 is preferably a cast or injection-molded product made of a material that can provide sufficient strength, such as a metal material such as aluminum, iron, or stainless steel. Specifically, the lower duct portion 13 may be a cast or injection-molded product having a thickness of at least 10 millimeters at any point.

[0017] The in-vehicle device 1 is required to have a level of sealing that can prevent air from outside the housing 10 from flowing into the space 10c surrounded by the outer surface of the duct 11 and the inner surface of the housing 10, in which the electronic components 42 are housed. For this reason, it is preferable that the end faces of the duct lower part 13 and the heat receiving block 41 in the Y-axis direction are smooth flat surfaces that abut against the housing 10. It is preferable that the end faces of the duct lower part 13 and the heat receiving block 41 on the positive side of the Y-axis are smoothly connected to each other, and that the end faces of the duct lower part 13 and the heat receiving block 41 on the negative side of the Y-axis are smoothly connected to each other. A smooth connection means that the slope of the tangent plane is continuous.

[0018] In embodiment 1, the end faces of the duct lower portion 13 and the heat receiving block 41 on the positive side of the Y axis are located on the same plane, and the end faces of the duct lower portion 13 and the heat receiving block 41 on the negative side of the Y axis are located on the same plane.

[0019] In order to improve the airtightness of the vehicle-mounted equipment 1, it is preferable that the vehicle-mounted equipment 1 be provided with an airtight material, such as a waterproof and dustproof resin, that is filled between the end faces in the Y-axis direction of the duct lower part 13 and the heat receiving block 41 and the housing 10.

[0020] The coil device 20 shown in Figures 1 to 4 comprises a casing 21 which is a cast or injection-molded product having a cavity inside, a plurality of fins 22 attached to the side of the casing 21 and housed in the duct 11, a coil 23 housed in the cavity of the casing 21, and a conductor 24 whose one end is connected to the coil 23 and which is routed outside the casing 21.

[0021] In the first embodiment, the casing 21 includes a box with an opening at the top in the vertical direction and a lid that can open and close the opening at the top in the vertical direction of the box. Like the duct 11, the casing 21 is a cast or injection-molded product, and therefore has a smaller size tolerance than a processed product formed by bending metal. Therefore, as shown in FIG. 2 , the bottom surface 21 a of the casing 21 can abut against the first wall surface 11 a, which is the inner surface of the lower vertical side of the duct 11, and the top surface 21 b of the casing 21 can abut against the second wall surface 11 b, which is the inner surface of the upper vertical side of the duct 11. As a result, the coil device 20 including the casing 21 is fixed to and supported by the duct 11.

[0022] The casing 21 abuts against the first wall surface 11a and the second wall surface 11b of the duct 11, so that the coil device 20 serves as a structural member that maintains the internal space of the duct 11. For this reason, the casing 21 preferably has a strength sufficient to prevent deformation due to vibrations caused when the railway vehicle is running. The casing 21 may be formed, for example, from an aluminum plate having a thickness of at least 10 millimeters.

[0023] The fins 22 are provided on the side surfaces of the casing 21, specifically, on surfaces of the casing 21 that intersect with the X-axis. The fins 22 are preferably flat, plate-like members. The main surfaces of the fins 22 extend in the extension direction of the duct 11. In the first embodiment, the fins 22 are attached to the casing 21 with the main surfaces of the fins 22 oriented parallel to the XY plane. The fins 22 extend in the extension direction of the duct 11, i.e., in the direction of air flow inside the duct 11. Therefore, heat generated in the coil 23 is efficiently transferred from the fins 22 to the air inside the duct 11. As a result, the coil 23 is cooled.

[0024] The fins 22 are preferably formed of a material with high thermal conductivity, for example, a metal such as copper or aluminum. The fins 22 are fixed to the side surfaces of the casing 21 by any attachment method, such as fitting, brazing, welding, bonding with an adhesive, or fastening with a fastening member. Specifically, the fins 22 need only be fixed to the casing 21 with enough strength that the positional relationship between the fins 22 and the casing 21 does not change when subjected to vibrations while the railway vehicle is running.

[0025] In the first embodiment, the fin 22 located at the lower end in the vertical direction is fixed to the first wall surface 11a by the first fastening member 31 with the fin 22 abutting the first wall surface 11a with its surface. The fin 22 located at the upper end in the vertical direction is fixed to the second wall surface 11b by the second fastening member 32 with the fin 22 abutting the second wall surface 11b with its surface. As described above, the fin 22 located at the lower end in the vertical direction and the fin 22 located at the upper end in the vertical direction abut the first wall surface 11a and the second wall surface 11b with their surfaces, respectively, so that heat generated in the coil 23 is efficiently transferred from the fin 22 to the duct 11. As a result, the cooling performance of the coil device 20 in the in-vehicle device 1 can be improved.

[0026] Coil 23 is housed in casing 21 in any orientation. Coil 23 is preferably housed in casing 21 with its central axis parallel to the Z-axis or Y-axis. Coil 23 is housed in a box that casing 21 has, and casing 21 is housed in duct 11 with the opening of the box closed by a lid that casing 21 has, so that contact of coil 23 with air outside housing 10 containing dust, moisture, etc. is prevented.

[0027] One end of the conductor 24 is disposed inside the casing 21 and connected to the coil 23. The conductor 24 is routed through a through-hole formed in the lid of the casing 21 and the heat receiving block 41, inside the housing 10, and to the outside of the duct 11. The other end of the conductor 24 is connected to an electronic device (not shown) inside the housing 10.

[0028] The first fastening member 31 includes a bolt that penetrates the duct lower portion 13 and the fin 22 at the lower end in the vertical direction, and a nut that fastens the bolt. The bolt penetrates the fin 22 at the lower end in the vertical direction and is disposed in the gap 22a between the fins 22 shown in FIG. 4 .

[0029] The second fastening member 32 has a bolt that penetrates the heat receiving block 41 that forms the duct 11 and the fin 22 at the vertical upper end, and a nut that tightens the bolt. The bolt penetrates the fin 22 at the vertical upper end and is disposed in the gap 22b between the fins 22 shown in FIG. 4.

[0030] The heat receiving block 41 has a first main surface 41a and a second main surface 41b located opposite the first main surface 41a. The heat receiving block 41 is preferably a flat, plate-like member. In the first embodiment, the first main surface 41a and the second main surface 41b face each other in the Z-axis direction. The heat receiving block 41 forms the duct 11. Specifically, a portion of the first main surface 41a of the heat receiving block 41 corresponds to the second wall surface 11b of the duct 11. A plurality of heat dissipation members 43 are attached to the first main surface 41a facing the inside of the duct 11. An electronic component 42, which is a heat-generating element, is attached to the second main surface 41b located opposite the first main surface 41a of the heat receiving block 41.

[0031] The heat receiving block 41 is attached to the vertical upper end of the duct lower part 13, and forms the duct 11 together with the duct lower part 13. The heat receiving block 41 may be attached to the duct lower part 13 by any attachment method such as fitting, brazing, welding, bonding with an adhesive, or fastening with a fastening member, as long as it is strong enough to prevent the positional relationship between the heat receiving block 41 and the duct lower part 13 from changing when subjected to vibrations while the railway vehicle is running.

[0032] Since the heat receiving block 41 forms part of the duct 11, it is preferable that the heat receiving block 41, like the duct 11, has a strength sufficient to prevent deformation due to vibrations caused when the railway vehicle is running. The heat receiving block 41 also preferably has a thermal conductivity sufficient to transfer heat generated by the electronic components 42 to the heat dissipation member 43. The heat receiving block 41 is preferably made of a material that has sufficient strength and high thermal conductivity, such as aluminum. Specifically, the heat receiving block 41 may be made of an aluminum plate having a thickness of at least 10 millimeters.

[0033] The electronic component 42 is, for example, a switching element included in a power conversion circuit, and generates heat when current is applied. The electronic component 42 is attached to the second main surface 41 b located opposite the first main surface 41 a forming the second wall surface 11 b of the duct 11. This prevents the air outside the housing 10 that flows into the inside of the duct 11 from coming into contact with the electronic component 42.

[0034] A plurality of heat dissipation members 43 are attached to the first main surface 41a of the heat receiving block 41. In the first embodiment, the plurality of heat dissipation members 43 are arranged side by side in the X-axis direction, with a gap between adjacent heat dissipation members 43. The heat dissipation members 43 dissipate heat transferred from the electronic components 42 via the heat receiving block 41 to air passing through the gap. In the first embodiment, the heat dissipation members 43 have a fin shape. The main surfaces of the heat dissipation members 43 extend in the extension direction of the duct 11. In the first embodiment, the heat dissipation members 43 are attached to the heat receiving block 41 with their main surfaces oriented parallel to the YZ plane. Because the heat dissipation members 43 extend in the extension direction of the duct 11, i.e., in the direction of air flow inside the duct 11, heat generated by the electronic components 42 is efficiently transferred from the heat dissipation members 43 to the air inside the duct 11. As a result, the electronic components 42 are cooled.

[0035] The heat dissipation member 43 is preferably formed of a material with high thermal conductivity, for example, a metal such as copper or aluminum. The heat dissipation member 43 is fixed to the first main surface 41a of the heat receiving block 41 by any attachment method such as fitting, brazing, welding, bonding with an adhesive, or fastening with a fastening member. Specifically, the heat dissipation member 43 only needs to be fixed to the heat receiving block 41 with enough strength that the positional relationship between the heat dissipation member 43 and the heat receiving block 41 does not change when subjected to vibrations while the railway vehicle is running.

[0036] Each heat dissipation member 43 transfers heat transferred from the electronic components 42 via the heat receiving block 41 to the air flowing into the duct 11. As a result, the electronic components 42 are cooled. In the first embodiment, the heat dissipation member 43 has a fin shape, and the main surface of the heat dissipation member 43 extends in the extension direction of the duct 11. Specifically, the heat dissipation member 43 is attached to the heat receiving block 41 with the main surface of the heat dissipation member 43 oriented parallel to the YZ plane.

[0037] In the in-vehicle device 1 having the above configuration, for example, air that flows into the duct 11 from the ventilation hole 10a passes between the fins 22 or between the heat dissipation members 43 and flows out of the housing 10 from the ventilation hole 10b. Heat generated in the coil 23 is transferred to the air passing between the fins 22, thereby cooling the coil 23. Heat generated in the electronic component 42 is transferred to the air passing between the heat dissipation members 43, thereby cooling the electronic component 42.

[0038] As described above, the coil device 20 according to embodiment 1 has a casing 21 that is a cast or injection-molded product with a small tolerance, so there is no need to provide clearance around the casing 21 within the duct 11, and the casing 21 can be accommodated in the duct 11 in a state where it abuts against the first wall surface 11a and the second wall surface 11b of the duct 11.

[0039] The duct 11 supports the coil device 20 including the casing 21 abutting against the first wall surface 11a, eliminating the need to provide an additional member for supporting the coil device 20. Therefore, the size of the in-vehicle device 1 is smaller than that of an in-vehicle device that includes a member for supporting a coil device.

[0040] Since the casing 21 abuts against the first wall surface 11a and the second wall surface 11b of the duct 11, the vibrations caused when the railway vehicle is running are suppressed, which causes the coil 23 housed in the casing 21 to vibrate together with the casing 21.

[0041] The casing 21 abuts against the first wall surface 11a and the second wall surface 11b of the duct 11, thereby serving as a structural member for maintaining the internal space of the duct 11. Therefore, there is no need to provide an additional strength member for maintaining the internal space of the duct 11, and the size of the duct 11 in the in-vehicle device 1 is smaller than that of a power conversion device provided with a strength member for maintaining the internal space of the duct.

[0042] The fins 22 located at the lower end in the vertical direction and the fins 22 located at the upper end in the vertical direction are in surface contact with the first wall surface 11a and the second wall surface 11b, respectively, so that heat generated in the coil 23 is efficiently transferred from the fins 22 to the duct 11. As a result, the cooling performance of the coil device 20 in the in-vehicle equipment 1 is improved.

[0043] Second Embodiment The method of arranging the coil device 20 is not limited to the above example. A power conversion device in which the coil device 20 is arranged in a manner different from that of the first embodiment will be described in a second embodiment, focusing on the differences from the first embodiment.

[0044] 5 is similar to the configuration of the in-vehicle device 1 according to the embodiment 1. In the in-vehicle device 2, a portion of the coil device 20 protrudes into the space 10c outside the duct 11.

[0045] As shown in FIG. 5 and FIG. 6, which is a cross-sectional view taken along the line VI-VI in FIG. 5, the upper part of the casing 21 in the vertical direction is located vertically above the heat receiving block 41.

[0046] 7, in which the coil device 20 is omitted from FIG. 6, a communication hole 41c is formed in the heat receiving block 41. The casing 21, which passes through the communication hole 41c and protrudes into the space 10c, is preferably fixed to the duct 11 in a state of abutting against a hole wall surface 41d, which is the wall surface of the communication hole 41c. To prevent air inside the duct 11 from flowing into the space 10c, it is preferable that the hole wall surface 41d be coated with, for example, a waterproof and dustproof resin.

[0047] As described above, the coil device 20 provided in the in-vehicle device 2 according to the second embodiment is fixed to the duct 11 with a portion thereof protruding outside the duct 11. This makes it possible to determine the size of the coil device 20 independently of the size of the duct 11, thereby increasing the degree of freedom in designing the coil device 20.

[0048] The present disclosure is not limited to the above-described embodiments. In the above-described embodiments, "fixed" includes "integrally formed." For example, as shown in FIG. 8 , the casing 21 and the fins 22 may be integrally formed. By integrally forming the casing 21 and the fins 22, heat is efficiently transferred from the coil 23 housed in the casing 21 to the fins 22 via the casing 21.

[0049] The number of coil devices provided in the in-vehicle device is arbitrary. As an example, the in-vehicle device 3 shown in Fig. 9 includes two coil devices 20 housed in the same duct 11 and heat dissipation members 43 and 44. The configuration of each coil device 20 is similar to that of the coil device 20 provided in the in-vehicle device 1 shown in embodiment 1. The vertical length of the heat dissipation member 44 is longer than the vertical length of the heat dissipation member 43. The in-vehicle device 3 may include multiple coil devices 20, each of which partially protrudes outside the duct 11, as shown in embodiment 2.

[0050] The shape of the heat dissipation members 43, 44 is not limited to the example of the above embodiment, and may be any shape that can transfer heat to the air flowing into the duct 11. As an example, each of the heat dissipation members 43, 44 may be a protrusion that extends in a direction away from the first main surface 41a that forms the second wall surface 11b. In this case, it is preferable that the tip of each of the heat dissipation members 43, 44 be thinner than the portion that is fixed to the first main surface 41a.

[0051] The heat dissipation members 43, 44 may be heat pipes. In this case, the heat dissipation members 43, 44 preferably have a main pipe embedded in the heat receiving block 41 and extending along the air flow in the duct 11, and a branch pipe connected to the main pipe and extending in a direction away from the heat receiving block 41. Fins may also be provided to be fixed to the branch pipe.

[0052] To prevent air from outside the housing 10 from flowing into the space 10c from the duct 11, it is preferable to perform a waterproof and dustproof treatment at the point where the vertical upper end of the duct lower portion 13 abuts against the heat receiving block 41. The waterproof and dustproof treatment can be, for example, the application of a waterproof and dustproof resin.

[0053] The on-board devices 1, 2, and 3 are not limited to power conversion devices that convert power supplied from an overhead line into three-phase AC power for supplying to a main motor, but may be any device that has a heating element and is mounted on a vehicle. The on-board devices 1, 2, and 3 are not limited to railway vehicles, but may be mounted on any moving object such as an automobile, an airplane, or a ship.

[0054] The housing 10 may be mounted on the roof of a railway vehicle. The orientation in which the housing 10 is mounted on the railway vehicle is not limited to the example described above. As an example, the on-board device 1-3 may be mounted on the railway vehicle with the extension direction of the duct 11 perpendicular to the X-axis direction.

[0055] The structure of the duct 11 is not limited to the above example, and may be any structure that allows air to flow into the housing 10 and can accommodate the coil device 10. As one example, the duct 11 may be attached directly to the bottom surface of the housing 10. As another example, the inner surface of the housing 10 may form the first wall portion 11a.

[0056] The arrangement position and shape of the fins 22 are not limited to the above example, and may be any arrangement position and shape that allows heat transferred from the coil device 23 to be dissipated to the air inside the duct 11. As one example, the fins 22 may be provided on a surface of the casing 21 that is perpendicular to the Y-axis direction. As another example, the fin 22 located at the lower end in the vertical direction may be located away from the first wall surface 11a of the duct 11. In this case, it is preferable that the bottom surface 21a of the casing 21 abuts the first wall surface 11a with a surface and is fixed to the first wall surface 11a. Similarly, the fin 22 located at the upper end in the vertical direction may be located away from the second wall surface 11b of the duct 11. In this case, it is preferable that the top surface 21b of the casing 21 abuts the second wall surface 11b with a surface.

[0057] The in-vehicle device 1-3 may include a blower for forcibly sending air into the duct 11. The blower may be provided outside the duct 11 to send air into the duct 11, or may be provided inside the duct 11 to suck air outside the housing 10 into the duct 11.

[0058] The present disclosure allows various embodiments and modifications without departing from the broad spirit and scope of the present disclosure. Furthermore, the above-described embodiments are intended to illustrate the present disclosure and do not limit the scope of the present disclosure. That is, the scope of the present disclosure is defined by the claims, not the embodiments. Various modifications made within the scope of the claims and the meaning of equivalent disclosures are considered to be within the scope of the present disclosure.

[0059] REFERENCE SIGNS LIST 1, 2, 3 In-vehicle equipment, 10 Housing, 10a, 10b Ventilation hole, 10c Space, 11 Duct, 11a First wall surface, 11b Second wall surface, 12 Support member, 13 Lower part of duct, 20 Coil device, 21 Casing, 21a Bottom surface, 21b Top surface, 22 Fins, 22a, 22b Air gap, 23 Coil, 24 Conductor, 31 First fastening member, 32 Second fastening member, 41 Heat receiving block, 41a First main surface, 41b Second main surface, 41c Communication hole, 41d Hole wall surface, 42 Electronic component, 43, 44 Heat dissipation member.

Claims

1. A coil device comprising: a coil wound around a central axis; and a casing which is a casting or injection molded product having an internal cavity and which houses the coil in the cavity, wherein the casing is housed in a duct which extends in a direction intersecting the vertical direction inside a housing for in-vehicle equipment and forms a space into which air outside the housing flows in, with at least a part of the bottom surface of the casing abutting a first wall surface which is the inner surface of the duct on the vertical lower side, and the casing is fixed to the first wall surface and to a second wall surface which is the inner surface of the duct on the vertical upper side.

2. The coil device according to claim 1, wherein the casing is accommodated in the duct with the bottom surface in surface contact with the first wall surface.

3. The coil device according to claim 2, wherein the casing is fixed to the first wall surface with the bottom surface abutting the first wall surface.

4. The coil device according to any one of claims 1 to 3, wherein the casing is accommodated in the duct with at least a portion of an upper surface thereof abutting against the second wall surface.

5. The coil device according to claim 4, wherein the casing is accommodated in the duct with the upper surface in surface contact with the second wall surface.

6. A coil device according to claim 4 or 5, wherein the casing is fixed to the second wall surface with the upper surface in surface contact with the second wall surface.

7. A coil device as claimed in any one of claims 1 to 4, wherein the casing protrudes from a communication hole formed in a portion of the second wall surface into a space surrounded by the outer surface of the duct and the inner surface of the housing, and is fixed to the duct in a state of abutment against a hole wall surface which is the wall surface of the communication hole.

8. A coil device according to any one of claims 1 to 7, further comprising a plurality of fins provided on a side surface of the casing, the main surfaces of which extend in the extension direction of the duct, and which are accommodated in the duct.

9. The coil device according to claim 8, wherein the fin located at the lower end in the vertical direction is fixed to the first wall surface with the fin abutting the first wall surface with its surface in contact.

10. A coil device as described in claim 8 or 9, wherein the fin located at the upper end in the vertical direction is fixed to the second wall surface with the fin abutting the second wall surface with its surface in contact.

11. A coil device according to any one of claims 8 to 10, wherein the casing and the plurality of fins are integrally formed.

12. An on-board device to be mounted on a vehicle, comprising: a coil device as described in any one of claims 1 to 11; a housing extending in a direction intersecting the vertical direction to form a space into which external air flows, and having a duct therein for accommodating the coil device in the space; a first fastening member for fixing the casing to a first wall surface which is the inner surface of the duct on the vertical lower side with at least a portion of the bottom surface of the casing abutting the first wall surface; and a second fastening member for fixing the casing to a second wall surface which is the inner surface of the duct on the vertical upper side.

13. The in-vehicle device according to claim 12, further comprising: a heat receiving block whose first main surface forms the second wall surface, and whose second main surface is located opposite the first main surface, and a heat generating element is attached to the second main surface; and a heat dissipation member attached to the first main surface and located inside the duct, for dissipating heat transferred from the heating element via the heat receiving block to the air flowing into the duct.

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