JP6926687B2 - Electronic device - Google Patents

Description

The disclosure herein relates to a waterproof electronic device.

As disclosed in Patent Document 1, a waterproof electronic device mounted on a vehicle is known. The electronic device comprises a waterproof enclosure that is watertightly sealed with a sealant. A circuit board is housed in the internal space of this waterproof housing. Further, on the outer surface side of the wall portion of the waterproof housing, heat radiating fins for radiating heat generated from the circuit board to the outside of the electronic device are provided.

Japanese Unexamined Patent Publication No. 2016-143852

By the way, electronic devices have become smaller as the mounting environment of vehicles has become narrower. Therefore, in the electronic device, the installation area of the heat radiating fin becomes narrower with the miniaturization of the electronic device, and it is difficult to secure the heat radiating property.

The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide an electronic device capable of realizing miniaturization while suppressing imposing mounting restrictions on the vehicle side.

To achieve the above objectives, this disclosure is:
An electronic device mounted on a vehicle
A waterproof housing (20, 20a, 30) having a wall portion (21, 21a) formed with a through hole (25), and a waterproof housing (20, 20a, 30).
The circuit board (60) housed in the internal space of the waterproof housing and
From the blade portion (120), the housing (200) that rotatably accommodates the blade portion and is arranged in the wall portion so as to have a portion facing the outer surface or the inner surface of the wall portion and close the through hole, and the housing. Blowers having electrical connection terminals (140 to 142) protruding into the internal space and forming an air flow along the outer surface through vents (201, 212) provided in the housing as the blades rotate. Unit (100) and
A sealing member (50) is interposed between the wall portion and the housing, and has a waterproof sealing portion (51) that watertightly seals around the through hole.
The blower unit is provided at a position where the electrical connection terminal is surrounded by a waterproof seal, and is electrically connected to the circuit board via the electrical connection terminal .
The housing is located on the first vent, which is at least partly above the blade in the rotation axis direction of the blade, and on the waterproof housing side, which is at least part below the blade in the rotation axis direction. It is characterized by having a plurality of second vents formed so as to be formed and opened in different directions from each other.

As described above, in the present disclosure, since the circuit board is housed in the waterproof housing, the heat generated from the circuit board is dissipated to the waterproof housing. Further, in the present disclosure, since the air flow along the outer surface is formed by the blower fan, heat dissipation of the waterproof housing can be promoted. Further, since the present disclosure has a waterproof seal portion, it is possible to ensure the waterproofness of the waterproof housing while electrically connecting the blower unit and the circuit board.

Further, in the present disclosure, the blower unit and the circuit board are electrically connected via an electric connection terminal protruding from a position surrounded by a waterproof seal portion into an internal space. Therefore, in the present disclosure, the circuit board and the blower unit are connected via a wire harness or the like provided outside the waterproof housing, or an electronic device or the like provided in a vehicle different from the circuit board and the blower unit are used. There is no need to make a direct electrical connection. Therefore, the present disclosure can suppress imposing mounting restrictions on the vehicle side. Further, in the present disclosure, the configuration can be simplified and the physique can be miniaturized. Further, the present disclosure can reduce the man-hours required to electrically connect the blower unit to the circuit board.

In addition, the blower unit forcibly creates an air flow to cool the waterproof housing. Therefore, it can be said that the electronic control device to which the blower unit is attached is superior in heat dissipation performance to the electronic control device to which only the heat dissipation fins are attached. That is, when the area occupied by the waterproof housing is the same, the electronic control device to which the blower unit is attached has better heat dissipation performance than the electronic control device to which only the heat dissipation fins are attached. Conversely, when comparing electronic control devices with the same heat dissipation performance, the area required by the waterproof housing of the electronic control device with the blower unit is the area occupied by the waterproof housing of the electronic control device with only the heat dissipation fins. Smaller than Therefore, in the present disclosure, the physique can be made smaller than the case where the heat radiation fins are provided in order to secure the same cooling performance as the blower unit.

The scope of claims and the reference numerals in parentheses described in this section indicate the correspondence with the specific means described in the embodiment described later as one embodiment, and the technical scope of the present disclosure. Is not limited to.

It is a perspective view which shows the schematic structure of the electronic device in 1st Embodiment. It is sectional drawing which follows the line II-II of FIG. It is a perspective view which shows the schematic structure of the electronic device in 2nd Embodiment. It is sectional drawing which follows the IV-IV line of FIG. It is a perspective view which shows the schematic structure of the electronic device in 3rd Embodiment. It is sectional drawing which follows the VI-VI line of FIG. It is sectional drawing which shows the schematic structure of the electronic apparatus in 4th Embodiment. It is sectional drawing which shows the schematic structure of the electronic apparatus in 5th Embodiment. It is sectional drawing which shows the schematic structure of the electronic apparatus in 6th Embodiment. It is sectional drawing which shows the schematic structure of the electronic apparatus in 7th Embodiment. It is sectional drawing which shows the schematic structure of the electronic apparatus in 8th Embodiment.

Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each form, the same reference numerals may be given to the parts corresponding to the matters described in the preceding forms, and duplicate explanations may be omitted. In each form, when only a part of the configuration is described, the other parts of the configuration can be applied with reference to the other forms described above. In the following, the three directions orthogonal to each other are referred to as the X direction, the Y direction, and the Z direction. Further, the plane defined by the X direction and the Y direction is referred to as an XY plane, and the plane defined by the X direction and the Z direction is referred to as an XZ plane.

(First Embodiment)
A schematic configuration of the electronic device 10 according to the present embodiment will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the electronic device 10 includes a waterproof housing including a case 20 and a cover 30, a circuit board 60, and a blower fan 100. The electronic device 10 can be applied as, for example, an electronic control unit (ECU) that controls an engine of a vehicle. Note that FIG. 2 is a partial cross-sectional view of the electronic device 10 in the XZ plane.

The waterproof housing provides a waterproof space as an internal space S1 for accommodating the circuit board 60. The waterproof housing is divided into two members in the Z direction, which is the thickness direction of the circuit board 60. One of the two members is the case 20 and the other is the cover 30. The waterproof housing is configured by assembling the case 20 and the cover 30 to each other via a seal member (not shown). That is, in the waterproof housing, the case 20 and the cover 30 are assembled via a sealing member to provide a waterproof space.

The case 20 has a box shape with one side open. In this embodiment, the case 20 is formed of a metal material such as aluminum in order to improve heat dissipation. That is, the case 20 can protect the circuit board 60 even if it is formed by using a resin material. However, by forming the case 20 using a metal material, heat dissipation can be improved as compared with the case 20 formed by using a resin material. As the case 20, for example, one molded by aluminum die casting can be adopted.

The wall portion 21 of the case 20 has, for example, a substantially rectangular shape in a plane. The wall portion 21 of the case 20 corresponds to the wall portion of the waterproof housing. A notch (not shown) is provided on one of the four side walls connected to the wall portion 21. This notch leads to an opening on one side of the case 20. Further, the notch is provided to expose a part of the connector 40 to the outside of the waterproof housing.

The wall portion 21 is formed with a fan mounting opening 25 that penetrates the wall portion 21 in the plate thickness direction. The fan mounting opening 25 is an opening for mounting the blower fan 100 to the case 20 of the waterproof housing. The fan mounting opening 25 is formed over the outer and inner surfaces of the case 20. That is, the fan mounting opening 25 is a through hole that communicates the internal space S1 and the external space of the waterproof housing. Further, the fan mounting opening 25 corresponds to a through hole formed in the wall portion 21.

In this embodiment, as an example, a case 20 is adopted in which a portion where the fan mounting opening 25 is formed is recessed with respect to another portion (connector mounting portion 22 or the like) of the wall portion 21. .. That is, the case 20 includes a portion of the wall portion 21 that protrudes from the portion where the fan mounting opening 25 is formed. The connector mounting portion 22 is provided on one end side in the X direction so as to accommodate the connector 40. However, depending on the electrical connection structure between the circuit board 60 and the external device, the connector mounting portion 22 may not be formed on the case 20.

Further, in the present embodiment, the wall portion 21 accommodates a tall component such as an aluminum electrolytic capacitor constituting the circuit board 60 as a portion protruding from the portion where the fan mounting opening 25 is formed. The case 20 in which the portion is formed is adopted as an example. The tall accommodating portion of the present embodiment extends in the X direction from the connector mounting portion 22. However, when the circuit board 60 does not include the tall component, the tall accommodating portion may not be formed in the case 20.

As described above, the fan mounting opening 25 is formed in the wall portion 21 except for the connector mounting portion 22 and the tall accommodating portion. Further, the fan mounting opening 25 is formed in a substantially flat portion of the wall portion 21.

Reference numeral 23 shown in FIG. 1 is a vehicle body fixing portion for attaching the electronic device 10 to the vehicle with screws or the like. Reference numeral 24 is a housing fixing hole for fixing the case 20 and the cover 30. A screw (not shown) is inserted into the housing fixing hole 24. The vehicle body fixing portion 23 and the housing fixing hole 24 are provided integrally with the case 20.

However, the electronic device 10 may be attached to the vehicle by a clip or an adhesive. In this case, the case 20 does not have to be provided with the vehicle body fixing portion 23. Further, the case 20 and the cover 30 may be fixed by a clip or an adhesive. In this case, the case 20 does not have to be provided with the housing fixing hole 24.

The cover 30 and the case 20 form an internal space S1 of the waterproof housing. By assembling the case 20 and the cover 30, the cover 30 closes the opening on one surface of the case 20. Further, the cover 30 closes the opening on one surface of the case 20 to partition the notch formed in the side wall, resulting in an opening (not shown). A part of the connector 40 is exposed to the outside by this opening. At least a part of the connector 40 is arranged in the internal space S1, and the remaining part is arranged in the external space.

In the present embodiment, in order to improve heat dissipation, a cover 30 formed of a metal material such as aluminum can be adopted as in the case 20. Further, as the cover 30, as in the case 20, a cover 30 formed by, for example, aluminum die casting can be adopted. The cover 30 has a box shape with one side open. In the present embodiment, as an example, a cover 30 having a plurality of heat radiation fins 31 formed on the outer surface side is adopted. However, the cover 30 does not have to have the heat radiation fins 31 formed.

The sealing member of the waterproof housing is such that the internal space S1 is the external space of the waterproof housing via the case 20 and the cover 30, the case 20 and the connector 40, and the cover 30 and the connector 40. It is provided to block communication. This seal member is arranged on the peripheral edge of the case 20 and the cover 30 so as to surround the internal space S1. The peripheral portions of the case 20 and the cover 30 are watertightly sealed by the sealing member. As the sealing member, for example, a liquid adhesive before curing can be adopted. Further, the sealing member is not limited to this, and any member such as an O-ring or an annular rubber sheet that is watertightly sealed by elastic deformation can be adopted.

The circuit board 60 is housed in the internal space S1 of the waterproof housing, and is fixed to the case 20 or the cover 30. Further, the circuit board 60 may be sandwiched between the case 20 and the cover 30 and fixed to the case 20 and the cover 30. The fixed structure of the circuit board 60 with respect to the case 20 and the cover 30 is not particularly limited.

The circuit board 60 has a printed circuit board and a circuit element 61 mounted on the printed circuit board. The printed circuit board is formed by arranging wiring on a base material formed of, for example, an electrically insulating material such as resin. A circuit of the circuit board 60 is formed by wiring and a circuit element 61. The printed circuit board has, for example, a substantially rectangular shape in a plane. The circuit element 61 is mounted on at least one of the surface on the case 20 side and the surface on the cover 30 side of the printed circuit board.

In the present embodiment, among the circuit elements 61, a heat generating element such as a power MOSFET is a surface on the case 20 side of the printed circuit board as shown in FIG. 2, and is around the blower fan 100 in a plan view in the Z direction. Have been placed. It is preferable that the electronic device 10 positively cools the periphery of the heat generating element, that is, the region of the wall portion 21 facing the heat generating element. Therefore, it is preferable that the heat generating element is provided around the blower fan 100 and at a position along the opening direction of the second vent 212, which will be described later. That is, it is preferable that the blower fan 100 is configured to be able to supply wind to the region of the wall portion 21 facing the heat generating element. The electronic device 10 can be configured so that air can be supplied to a region of the wall portion 21 facing the heat generating element depending on the position of the blower fan 100 on the wall portion 21, the position of the second vent 212 on the blower fan 100, and the like. be.

Further, in the present embodiment, a printed circuit board on which the through holes 62 are formed is adopted. Then, in the circuit board 60, for example, the circuit element 61 and the printed circuit board (wiring) are electrically connected in a state where the terminal of the circuit element 61 is inserted into the through hole 62.

A connector 40 is mounted on the circuit board 60. The connector 40 is an electronic component for electrically connecting the circuit board 60 and an electronic device provided outside the electronic device 10. The connector 40 is mounted on one end side of the circuit board 60 in the X direction and is electrically connected to the wiring of the printed circuit board. A part of the connector 40 is exposed to the outside through the above-mentioned opening of the waterproof housing, and the remaining part is housed in the internal space S1.

The connector 40 has a housing formed of a resin material and a plurality of terminals formed of a conductive material and held in the housing. That is, in the connector 40, a plurality of terminals are electrically connected to the wiring of the printed circuit board. The connector 40 may be electrically connected to the wiring of the printed circuit board with a plurality of terminals inserted into the through holes 62.

The blower fan 100 corresponds to a blower unit. The blower fan 100 is attached to the wall portion 21 of the case 20. The blower fan 100 is attached to the fan mounting opening 25 of the case 20. The blower fan 100 is provided to cool the circuit board 60. The blower fan 100 forms an air flow as shown by the alternate long and short dash line in FIG. 2 by the rotation of the blade portion 120, and supplies the wind to the case 20. That is, the blower fan 100 forms an air flow along the outer surface of the wall portion 21 through the vents 201 and 212 provided in the housing 200 as the blade portion 120 rotates. Further, the blower fan 100 can form an air flow as shown by the alternate long and short dash line in FIG. 2 by configuring the positions and opening directions of the first vent 201 and the second vent 212 to be described later. can.

The blower fan 100 cools the circuit board 60 by supplying air to the case 20. That is, it can be said that the blower fan 100 cools the circuit board 60 in the case 20 by cooling the case 20. Therefore, the blower fan 100 can be said to be a cooling fan. As the blower fan 100, for example, a well-known axial flow fan can be adopted.

The blower fan 100 includes a fan mechanism that supplies air to the case 20 and a housing 200 that holds the fan mechanism. The blower fan 100 is fixed to the case 20 via the seal member 50 and is electrically connected to the circuit board 60.

The fan mechanism includes, for example, a shaft portion 110, a blade portion 120, a fan circuit board 130, a terminal 140, a potting portion 150, and the like. Since the fan mechanism can adopt a well-known structure for an axial fan, the shaft portion 110, the blade portion 120, and the like are shown in a simplified manner in FIG. 2 and the like.

For example, the shaft portion 110 is arranged around the rotating shaft 111, which is the rotating shaft of the blade portion 120, the bearing for forming the rotating shaft rotatably with respect to the housing 200 and the coil, and the housing 200. Includes fixed coils and the like. The coil is electrically connected to the fan circuit board 130, and is energized from the fan circuit board 130. The coils are provided at a plurality of locations around the rotating shaft.

The rotary shaft 111 is provided perpendicular to the circuit board 60 with the blower fan 100 attached to the case 20 and the circuit board 60. The blower fan 100 is attached to the case 20 so that the axial direction of the rotating shaft 111, that is, the direction of the rotating shaft of the blade portion 120 coincides with the Z direction. That is, the blower fan 100 is arranged on the wall portion 21 in a state where the rotation axis of the blade portion 120 coincides with the plate thickness direction of the circuit board 60, that is, in a state along the Z direction. Therefore, in the blower fan 100, the blade portion 120 rotates along the XY plane.

Further, for example, a plurality of blade portions 120 are provided around the coil at equal intervals, and magnets are attached at positions facing the coil. The blade portion 120 is fixed to the rotating shaft, and is configured to be rotatable with respect to the housing 200 as the rotating shaft rotates.

As described above, it can be said that the fan mechanism includes a rotor configured to be rotatable with respect to the housing 200 and a stator fixed to the housing 200. The rotor includes, for example, a rotating shaft 111, a blade portion 120, and the like. On the other hand, the stator includes, for example, a coil and a bearing. Further, it can be said that the fan mechanism includes a motor and a blade portion 120 that rotates with the rotation of the motor.

In the blower fan 100, the blade portion 120 rotates when the coil is energized. Then, the blower fan 100 takes in air from the first vent 201 and discharges it from the second vent 212 by rotating the blade portion 120. In this case, the first vent 201 may be referred to as a suction port, and the second vent 212 may be referred to as an discharge port.

The blower fan 100 may be configured to take in air from the second vent 212 and discharge it from the first vent 201 by rotating the blade portion 120. In this case, the second vent 212 can be referred to as a suction port, and the first vent 201 can be referred to as an discharge port.

In this embodiment, the potting portion 150 is adopted in order to protect the fan circuit board 130130. However, the present disclosure is not limited to this, and the fan circuit board 130130 and the terminal 140 may be insert-molded together with the housing 200 described later. Further, the blower fan 100 does not have to be provided with the potting portion 150. The fan mechanism adopted in this embodiment is an example. The fan mechanism can be adopted, for example, even if it has the same configuration as the centrifugal fan.

The housing 200 houses the fan mechanism in a state in which rotors such as the rotating shaft 111 and the blade portion 120 can be rotated. The housing 200 includes a first vent 201, a side wall 210, a side wall end 211, a second vent 212, a bottom 220, a flange 221 and the like. In the blower fan 100, since the fan mechanism is surrounded by the side wall 210 of the housing 200, it is possible to prevent foreign matter such as stepping stones from hitting the fan mechanism, and it is possible to protect the blade portion 120 of the fan mechanism and the like.

The housing 200 is arranged so as to cover the fan mounting opening 25 while facing the peripheral portion of the fan mounting opening 25 on the inner surface of the wall portion 21 so as to close the fan mounting opening 25. That is, the housing 200 is arranged in the wall portion 21 so as to close the fan mounting opening 25 while having a portion facing the inner surface of the wall portion 21. A plurality of vents 201 and 212 are formed in the housing 200. The plurality of vents are formed at different positions in the Z direction so that an air flow along the outer surface of the wall portion 21 is formed as the blade portion 120 rotates.

In this embodiment, the housing 200 in which the first vent 201 and the second vent 212 are formed is adopted. One of the first vent 201 and the second vent 212 functions as an air inlet, and the other functions as an exhaust port.

Both the first vent 201 and the second vent 212 are formed in the Z direction above the outer surface around the opening of the fan mounting opening 25 in the wall portion 21, that is, at a position away from the circuit board 60. There is. The first vent 201 is formed so that at least a part thereof is located above the blade portion 120 in the Z direction, and the second vent 212 is formed so that at least a part thereof is located below the blade portion 120 in the Z direction. There is. Further, the second vent 212 is provided at a position where the blower fan 100 is arranged outside the waterproof housing in a state of being attached to the case 20. That is, the second vent 212 is provided at a position opposite to the internal space S1 with respect to the outer surface of the wall portion 21.

Further, the first vent 201 is open in the Z direction. On the other hand, the second vent 212 opens in the direction along the XY plane (hereinafter, the XY plane direction). As described above, the first vent 201 and the second vent 212 have different opening directions. Therefore, it can be said that the flow of wind passing through the first vent 201 when the blade portion 120 rotates is in the Z direction. On the other hand, it can be said that the flow of wind passing through the second vent 212 when the blade portion 120 rotates is in the XY plane direction. It can be said that the blower fan 100 is configured so that the direction of the wind passing through the suction port and the direction of the wind passing through the discharge port can be changed. Further, the blower fan 100 is configured so that the air sucked in the XY plane direction can be discharged in the Z-axis direction or the air sucked in the Z-axis direction can be discharged in the XY plane direction by rotating the blade portion 120. It can be said that there is.

In this embodiment, the housing 200 has a side wall 210, a bottom 220, and a flange 221. The housing 200 is formed using, for example, a resin material. The side wall 210 and the bottom 220 have a bottomed tubular shape with one end opening in the Z direction. The opening of this cylinder is the first vent 201. The entire first vent 201 is provided above the blade portion 120 in the Z direction.

The housing 200 has, for example, a bottom portion 220 having a substantially rectangular shape in a plane and four side walls 210 connected to the bottom portion 220. A second vent 212 is formed on at least one of the side walls 210. In the present embodiment, a second vent 212 is formed on each of the four side walls 210. The second vent 212 is a through hole that penetrates the side wall 210. The second vent 212 is formed so that the Z direction is the lateral direction and the direction orthogonal to the Z direction is the longitudinal direction. However, the opening shape of the second vent 212 is not limited to this. The opening shape of the second vent 212 may be circular or square, and is not particularly limited.

The side wall 210 has a second vent 212 formed at a position separated from the bottom 220 in the Z direction. The side wall 210 is provided with a side wall end portion 211 at an end portion on the bottom portion 220 side. The side wall end portion 211 is a portion of the side wall 210 between the second vent 212 and the bottom 220. In the side wall end portion 211, the distance between the bottom portion 220 and the flange portion 221 and the second vent 212 in the Z direction is longer than the thickness of the wall portion 21. As a result, in the housing 200, the second vent 212 is arranged outside the waterproof housing. However, in the housing 200, the second vent 212 does not communicate with the internal space S1, and at least a part of the second vent 212 may be arranged outside the waterproof housing.

Further, in order to maintain the waterproofness of the waterproof housing attached to the case 20, the housing 200 does not have a hole for communicating the accommodation space accommodating the blade portion 120 and the like with the internal space S1. That is, for example, the bottom 220 is not provided with a through hole or the like that reaches the internal space S1. It can be said that the bottomed tubular member composed of the side wall 210 and the bottom 220 is not provided with an opening at the bottom.

However, in the housing 200, as will be described later, a terminal 140 for electrically connecting the blower fan 100 and the circuit board 60 projects into the internal space S1. Therefore, the terminal 140 is configured to protrude from the housing 200 in a watertight state with the housing 200. This can be achieved by insert molding the terminal 140 or the like when forming the housing 200.

In this embodiment, the housing 200 has an R-shaped corner portion of adjacent side walls 210, that is, a connecting portion. The second vent 212 is formed in a flat portion excluding the R-shaped portion. However, the housing 200 is not limited to this, and may not have an R shape, and a second vent 212 may be formed in a portion having an R shape.

Further, in the present embodiment, the housing 200 in which the second vents 212 are formed at four locations is adopted. However, the housing 200 is not limited to this, and the second vents 212 may be formed at three or less places, or the second vents 212 may be formed at five or more places. Further, the housing 200 may have a round shape in a plan view in the Z direction.

As shown in FIG. 2, the housing 200 is inserted into the fan mounting opening 25. The housing 200 is arranged inside and outside the case 20 through the fan mounting opening 25. At least a part of the bottom 220 is arranged in the internal space S1. A part of the side wall 210 is arranged in the fan mounting opening 25, and the other part of the side wall 210 projects upward from the outer surface of the wall portion 21. In the present embodiment, a part of the side wall end portion 211 is arranged in the fan mounting opening 25 with the housing 200 inserted in the fan mounting opening 25. That is, the side wall end portion 211 faces the side wall of the case 21 constituting the fan mounting opening 25 in the direction orthogonal to the Z direction.

The flange portion 221 is integrally formed with the side wall 210 and the bottom 220 so as to spread from the lower end of the cylinder formed by the side wall 210 and the bottom 220 to the periphery. The flange portion 221 is provided so as to face the wall portion 21 on the entire circumference around the fan mounting opening 25. In the present embodiment, the flange portion 221 is connected to the lower end of the side wall 210 and the outer peripheral end of the bottom portion 220. That is, it can be said that the flange portion 221 is a portion protruding along the XY plane from the lower end of the side wall 210 and the outer peripheral end of the bottom portion 220. Further, the flange portion 221 faces the peripheral portion of the fan mounting opening 25 on the inner surface of the wall portion 21. The flange portion 221 corresponds to a portion of the wall portion 21 facing the inner surface.

The blower fan 100 is fixed to the case 20 at least at the flange portion 221. In the electronic device 10, a waterproof seal portion 51 is formed by a part of a portion facing the housing 200 and the case 20. The waterproof seal portion 51 includes a seal member 50 interposed at a portion facing at least the flange portion 221 and the case 20. In the present embodiment, in addition to the facing portion between the flange portion 221 and the case 20, the sealing member 50 is interposed in the facing portion between the side wall end portion 211 and the case 20. The facing portion between the flange portion 221 and the case 20 can be rephrased as a region between the flange portion 221 and the case 20 or a facing region. Similarly, the facing portion between the side wall end portion 211 and the case 20 can be rephrased as a region between the side wall end portion 211 and the case 20 or a facing region.

The waterproof seal portion 51 is provided in an annular shape so as to surround the fan mounting opening 25. Of the housing 200 and the case 20, the portion of the housing 200 and the case 20 that overlaps with the seal member 50 in a plan view in the Z direction is a portion that constitutes the waterproof seal portion 51. In the present embodiment, in addition to the facing portion between the flange portion 221 and the case 20, the facing portion between the side wall end portion 211 and the case 20 is a waterproof seal portion 51. As described above, the electronic device 10 has a waterproof seal portion 51 in which the seal member 50 is interposed between the wall portion 21 and the housing 200 and the fan mounting opening 25 is watertightly sealed. It can be said that there is.

However, the electronic device 10 is not limited to this, and for example, the seal member 50 may not be provided at the portion where the side wall end portion 211 and the case 20 face each other. In this case, the electronic device 10 is provided with the seal member 50 in a portion within a predetermined range from the tip of the flange portion 221 and this portion becomes the waterproof seal portion 51.

The electronic device 10 is not limited to these, and is the entire circumference of the fan mounting opening 25, and is a part of the facing portion between the flange portion 221 and the case 20 and the facing portion between the side wall 210 and the case 20. It suffices if the seal member 50 is provided.

Further, as the seal member 50, a liquid adhesive can be adopted before curing. The blower fan 100 is fixed to the case 20 by the waterproof seal portion 51.

The terminal 140 corresponds to an electrical connection terminal, projects from the housing 200 toward the internal space S1, and is electrically connected to the circuit board 60. The blower fan 100 includes, for example, three terminals 140. The terminal 140 penetrates the bottom 220 of the housing 200. The terminal 140 projects into the internal space S1 from the portion of the housing 200 surrounded by the waterproof seal portion 51. That is, it can be said that the terminal 140 is in the Z direction from the bottom 220 and projects toward the circuit board 60 side. A part of the terminal 140 is electrically connected to the fan circuit board 130 arranged in the housing 200, and the other part is electrically connected to the circuit board 60.

In this way, in the electronic device 10, the fan circuit board 130, that is, the blower fan 100 and the circuit board 60 are electrically connected via the terminal 140. Further, the blower fan 100 is provided at a position where the terminal 140 is surrounded by the waterproof seal portion 51, and is electrically connected to the circuit board 60 via the terminal 140.

The metal terminal 140 is insert-molded into the resin housing 200 and integrated. Further, the terminal 140 is partially arranged in, for example, a through hole 62 provided in the circuit board 60, that is, is inserted into the through hole 62, and is wired to the circuit board 60 by a conductive connecting member 63 such as solder. Is electrically connected to.

A drive circuit for rotating the blade portion 120 is formed on the fan circuit board 130. The coil in the shaft portion 110 is electrically connected to the fan circuit board 130. In the blower fan 100, the rotor is rotated in the positive direction when the coil is energized through the circuit board 60, the terminal 140, and the fan circuit board 130. Then, in the blower fan 100, a pressure difference of air is generated in the housing 200 due to the predetermined shape of the blade portion 120, and as shown in FIG. 2, the air sucked from the first vent 201 is taken from the second vent 212. It is discharged. When the rotor is rotated in the direction opposite to the forward direction of the blower fan 100, the air sucked from the second vent 212 is discharged from the first vent 201.

The fan circuit board 130 is arranged in the housing 200 below the blade portion 120, that is, on the circuit board 60 side. The fan circuit board 130 is fixed to the housing 200. In the present embodiment, a part of the fan circuit board 130 and the terminal 140 is embedded in the potting portion 150 and sealed by the potting portion 150. Therefore, a part of the fan circuit board 130 and the terminal 140 is protected by the potting portion 150. That is, the blower fan 100 can suppress the adhesion of liquid such as water to the fan circuit board 130 and the terminals 140 covered with the potting portion 150. In other words, the blower fan 100 is waterproofed by the potting portion 150.

The potting portion 150 is provided in the housing 200 so as not to block the second vent 212 and not to hinder the movement of the rotor such as the blade portion 120. In the present embodiment, as an example, an example in which the potting portion 150 is formed in the space from the bottom 220 to the second vent 212, that is, the space surrounded by the side wall end 211 on the bottom 220 is adopted. There is.

The fan circuit board 130 may be supported by a support portion different from the terminal 140. The fan circuit board 130 may be fixed to the inner surface of the bottom 220, that is, the surface of the bottom 220 on the external space side. Further, the sealing of the fan circuit board 130 is not limited to the potting portion 150. For example, the fan circuit board 130 on which the terminals 140 are mounted can be adopted even if it is insert-molded in the housing 200 and sealed by the bottom 220.

Next, an example of the procedure for assembling the electronic device 10 described above will be described.

First, the case 20, the cover 30, the circuit board 60, and the blower fan 100 are prepared. Then, the blower fan 100 is mounted on the circuit board 60. In this embodiment, the insertion-mounted terminal 140 is adopted, the terminal 140 is inserted into the through hole 62 of the circuit board 60, and the circuit board 60 and the terminal 140 are electrically connected by the connecting member 63. In this way, the circuit board 60 and the blower fan 100 are integrated.

The connector 40 may be mounted on the circuit board 60 at the same timing as the blower fan 100, or may be mounted at a timing different from that of the blower fan 100. In this embodiment, the circuit element 61, the connector 40, and the blower fan 100 to be inserted and mounted are soldered at the same timing.

Next, the circuit board 60 is attached to the case 20. For example, the case 20 has a pedestal (not shown) on the inner surface side of the wall portion 21, and the circuit board 60 is arranged on the pedestal and fixed by screws.

When the circuit board 60 is attached, the blower fan 100 is also attached to the case 20. Before arranging the circuit board 60 on the pedestal of the case 20, the seal member 50 is applied to the flange portion 221 and the side wall end portion 211. Further, a seal member (not shown) is also applied to the peripheral portion of the case 20 where the housing of the connector 40 faces. The seal member 50 may be applied to a portion of the case 20 facing the flange portion 221 and the side wall end portion 211.

Then, the circuit board 60 is arranged on the pedestal with the blower fan 100 positioned with respect to the fan mounting opening 25. As a result, the seal member 50 is formed between the case 20 and the flange portion 221 and the side wall end portion 211. The seal member 50 comes into contact with the case 20, the flange portion 221 and the side wall end portion 211. Then, the waterproof seal portion 51 is formed by fixing the circuit board 60 to the case 20.

Next, a seal member is applied to the peripheral edge of the case 20 and the portion of the connector 40 facing the cover 30, and then the cover 30 is assembled to the case 20. From the above, the above-mentioned electronic device 10 can be obtained.

As described above, in the electronic device 10, the blower fan 100 and the circuit board 60 are electrically connected via the terminal 140 protruding from the position surrounded by the waterproof seal portion 51 into the internal space S1. Therefore, the electronic device 10 does not need to electrically connect the electronic device or the like provided in the vehicle different from the circuit board 60 to the blower fan 100, and can suppress imposing mounting restrictions on the vehicle side. Further, the electronic device 10 connects the circuit board 60 and the blower fan 100 via a wire harness or the like provided outside the waterproof housing, or connects with an electronic device provided in a vehicle different from the circuit board 60. There is no need to directly electrically connect to the blower fan 100. Therefore, the electronic device 10 can suppress imposing mounting restrictions on the vehicle side. As a result, the electronic device 10 can be simplified in configuration and can be miniaturized in size. Further, the electronic device 10 can reduce the man-hours required for electrically connecting the blower fan 100 to the circuit board 60.

Further, the blower fan 100 forcibly creates an air flow to cool the case 20. Therefore, it can be said that the electronic device 10 to which the blower fan 100 is attached is superior in heat dissipation performance to the electronic device to which only the heat radiation fins are attached. That is, when the area occupied by the waterproof housing is the same, the electronic device 10 to which the blower fan 100 is attached is superior in heat dissipation performance to the electronic control device to which only the heat dissipation fins are attached. On the contrary, when comparing electronic devices having the same heat dissipation performance, the area required by the waterproof housing of the electronic device 10 to which the blower fan 100 is attached is larger than the area occupied by the waterproof housing of the electronic device to which only the heat dissipation fins are attached. Is also small. Therefore, the electronic device 10 can be made smaller than the case where the heat radiation fins are provided in order to secure the same cooling performance as the blower fan 100.

Further, in order to cool the waterproof housing and the circuit board, it is conceivable to arrange engine cooling water or the like around the waterproof housing and cool it with the engine cooling water. Further, in order to cool the waterproof housing and the circuit board, it is conceivable to arrange the electronic device at a position where the wind from the radiator fan hits and cool it by the wind from the radiator fan.

However, in the electronic device 10, the blower fan 100 is attached to the case 20 as described above, and the blower fan 100 cools the device 10. Therefore, the electronic device 10 does not need to arrange the engine cooling water around the waterproof housing or the electronic device 10 at a position where the wind from the radiator fan hits, and imposes mounting restrictions on the vehicle side. Can be suppressed.

It is also conceivable that the blower fan 100 is arranged on the wall portion 21 in a state where the rotation axis of the blade portion 120 is orthogonal to the Z direction. However, in the electronic device 10, the rotation axis is arranged on the wall portion 21 in a state where the rotation axis coincides with the plate thickness direction of the circuit board 60. Therefore, the electronic device 10 can be made smaller in the Z direction than when the electronic device 10 is arranged on the wall portion 21 in a state where the rotation axis is orthogonal to the Z direction.

In particular, in the present embodiment, a part of the blower fan 100 is arranged in the fan mounting opening 25. Therefore, the electronic device 10 can be further miniaturized in the Z direction. Further, since the electronic device 10 has a part of the blower fan 100 arranged in the internal space S1, the physique can be further reduced in the Z direction.

Further, in the electronic device 10, the blower fan 100 and the case 20 are assembled so that the flange portion 221 of the housing 200 faces the inner surface of the wall portion 21. Therefore, in the electronic device 10, the blower fan 100 can be mounted on the circuit board 60, and then the case 20 can be assembled to the blower fan 100. As a result, the electronic device 10 can easily insert the terminal 140 exposed from the blower fan 100 into the through hole 62 of the circuit board 60. Further, the electronic device 10 can handle the blower fan 100 as one of the electronic components mounted on the circuit board 60, and can simplify the assembly.

The electronic device 10 can attach the blower fan 100 to the case 20 without changing the outer shape of the cover 30, the outer shape of the circuit board 60, and the manufacturing process, as opposed to the configuration in which heat is dissipated by the heat radiation fins provided in the case 20. can.

In the electronic device 10, since the circuit board 60 is housed in the waterproof housing, the heat generated from the circuit board 60 is dissipated to the waterproof housing. Then, in the electronic device 10, since the air flow along the outer surface is formed by the blower fan 100, heat dissipation of the waterproof housing can be promoted. Since the electronic device 10 cools the circuit board 60 by the wind generated by the blower fan 100, the waterproof housing and the circuit board 60 are rapidly cooled rather than the configuration in which the waterproof housing and the circuit board 60 are cooled by the heat radiation fins. Can be done.

That is, in the present embodiment, the blower fan 100 is attached to the case 20 so that the rotation axis of the blade portion 120 substantially coincides with the Z direction, which is the plate thickness direction of the circuit board 60. Then, in the housing 200, the first vent 201 and the second vent 201 and the second vent are located at different positions in the Z direction so that an air flow along the outer surface of the case 20 is formed with the rotation of the blade portion 120. 212 is formed. Therefore, the blower fan 100 can efficiently cool the case 20 and the circuit board 60.

In particular, in the present embodiment, the first vent 201 is a suction port and the second vent 212 is a discharge port. According to this, the flow velocity on the outer surface of the case 20 can be increased even at the same rotation speed as compared with the configuration in which the second vent 212 is the suction port and the first vent 201 is the discharge port. That is, the temperature of the case 20 and eventually the circuit board 60 can be lowered. This point has been confirmed by simulation.

As described above, in the configuration in which the bottom wall of the case is not provided with a through hole, a connector is provided in the blower unit, and an electrical connection is made outside the waterproof housing. Therefore, the harness connected to the connector is arranged on the outer surface of the case, which hinders cooling. That is, the arrangement of the heat generating element, which is an electronic component, is also limited. On the other hand, in the present embodiment, the terminal 140 of the blower fan 100 is connected to the circuit board 60. Therefore, since the above-mentioned connector and harness are not obstructed, the degree of freedom in arranging the circuit element 61 can be improved.

As described above, in this embodiment, the second vent 212 is formed on all four side walls 210 of the housing 200 so that the connector and the harness are not obstructed. As a result, the air sucked from the first vent 201 spreads on the outer surface of the case 20 in all directions. Therefore, the case 20 can be effectively cooled. Further, since the electronic device 10 has the waterproof seal portion 51, it is possible to ensure the waterproofness of the waterproof housing while electrically connecting the blower fan 100 and the circuit board 60.

In this embodiment, a liquid adhesive is used as the seal member 50 before curing. However, the seal member 50 is not limited to this, and any member that watertightly seals around the fan mounting opening 25 by elastic deformation can be adopted. The seal member 50 is an O-ring, an annular rubber sheet, or the like, and is provided at a position surrounding the fan mounting opening 25. The fan mounting opening 25 is sandwiched between the housing 200 and the case 20 and elastically deformed. Seal the area around the water tightly. In this case, the electronic device 10 preferably includes a fixing mechanism for fixing the blower fan 100 to the case 20. Moreover, this point is the same in other embodiments.

The preferred embodiments of the present disclosure have been described above. However, the present disclosure is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present disclosure. Hereinafter, the second to eighth embodiments will be described as other embodiments of the present disclosure. The above-described embodiment and the second to eighth embodiments can be carried out individually, but can also be carried out in combination as appropriate. The present disclosure is not limited to the combinations shown in the embodiments, but can be implemented in various combinations.

(Second Embodiment)
A schematic configuration of the electronic device 10a according to the second embodiment will be described with reference to FIGS. 3 and 4. Here, the points different from the electronic device 10 in the electronic device 10a will be mainly described. The electronic device 10a differs from the electronic device 10 in the configuration of the blower fan 100a, mainly the configuration of the housing 200a. In the electronic device 10a, the same reference numerals are given to the same components as those of the electronic device 10. Therefore, the components having the same reference numerals can be applied with reference to the above embodiment.

The blower fan 100a includes a fan mechanism similar to the above and a housing 200a. The housing 200a is arranged in the wall portion 21 so as to close the fan mounting opening 25 while having a portion facing the outer surface of the wall portion 21. Unlike the housing 200, the housing 200a is not provided with the flange portion 221. Further, the housing 200a includes a recess 230, an intermediate portion 240 connected to the recess 230 and the side wall end portion 211.

The recess 230 is a portion to be inserted into the fan mounting opening 25 with the blower fan 100a mounted on the case 20. The recess 230 is an end of the housing 200a on the bottom 220 side, and is a recessed portion with respect to the side wall 210. The housing 200a is recessed over the entire circumference around the rotation axis to form a recess 230. Therefore, the opening surface surrounded by the side wall of the recess 230 has a smaller area than the opening surface surrounded by the side wall 210. It can be said that the recess 230 has a bottomed tubular shape with one end opening in the Z direction. Further, in the housing 200a, the bottom of the recess 230 is the bottom 220.

The intermediate portion 240 is a portion facing the outer surface of the wall portion 21 with the blower fan 100a attached to the case 20. The intermediate portion 240 is provided, for example, in parallel with the outer surface of the wall portion 21. The intermediate portion 240 is provided at the open end of the recess 230 over the entire circumference.

The housing 200a is arranged in the wall portion 21 so that the recess 230 is inserted into the fan mounting opening 25 and closes the fan mounting opening 25 while the intermediate portion 240 faces the outer surface of the wall portion 21. In the present embodiment, in addition to the facing portion between the intermediate portion 240 and the case 20, the sealing member 50 is interposed in the facing portion between the recess 230 and the case 20. As described above, the electronic device 10a has a waterproof seal portion 51 in which the seal member 50 is interposed between the wall portion 21 and the housing 200a and the fan mounting opening 25 is watertightly sealed. It can be said that it is.

However, in the electronic device 10a, the seal member 50 is provided on the entire circumference of the fan mounting opening 25, and a part of the facing portion between the recess 230 and the case 20 and the facing portion between the intermediate portion 240 and the case 20. I just need to be there. It is preferable that the electronic device 10a is provided with the seal member 50 over the entire area facing the intermediate portion 240 and the case 20 because it is possible to prevent liquid from entering between the case 20 and the intermediate portion 240. Further, in the electronic device 10a, the waterproof property can be improved if the sealing member 50 is provided in the entire area of the concave portion 230 and the case 20 in addition to the entire area of the intermediate portion 240 and the case 20 facing each other. , Even more preferable.

The assembly procedure of the electronic device 10a is different from that of the electronic device 10. For example, first, the blower fan 100a is attached to the case 20. At this time, in the blower fan 100a, although the recess 230 is inserted into the fan mounting opening 25, the intermediate portion 240 comes into contact with the wall portion 21 via the seal member 50. After that, the cover 30 and the case 20 are assembled with the circuit board 60 housed therein.

Alternatively, first, the cover 30 and the case 20 are assembled with the circuit board 60 housed therein. After that, the blower fan 100a may be mounted on the circuit board 60 while the blower fan 100a is attached to the case 20. At this time, in the blower fan 100a, although the recess 230 is inserted into the fan mounting opening 25, the intermediate portion 240 comes into contact with the wall portion 21 via the seal member 50. In this case, it is preferable to use the press-fit terminal described later as the terminal 140.

Therefore, in the electronic device 10a, the height of the blower fan 100a with respect to the circuit board 60 can be defined by the wall portion 21. In other words, the electronic device 10a can specify the insertion amount when the terminal 140 is inserted into the through hole 62. Further, it can be said that the electronic device 10a can specify the amount of movement when the blower fan 100a is assembled to the case 20 and the circuit board 60.

The electronic device 10a can have the same effect as the electronic device 10. Further, since the electronic device 10a does not need to provide the flange portion 221 arranged in the internal space S1, it is possible to prevent the volume of the internal space S1 from becoming small. Further, since the electronic device 10a does not need to be provided with the flange portion 221, the configuration of the housing 200a can be simplified.

The electronic device 10a is not provided with the seal member 50 between the intermediate portion 240 and the wall portion 21, and is a through hole that penetrates the potting portion 150 and the intermediate portion 240 in the Z direction as the second vent 212. May be formed. In this case, the blower fan 100a can suck in air and discharge the air in the Z direction.

(Third Embodiment)
A schematic configuration of the electronic device 10b according to the third embodiment will be described with reference to FIGS. 5 and 6. Here, the points different from the electronic device 10 in the electronic device 10b will be mainly described. The electronic device 10b is different from the electronic device 10 in the configuration of the case 20a, the configuration of the blower fan 100b, and mainly the configuration of the housing 200b. In the electronic device 10b, the same reference numerals are given to the same components as those of the electronic device 10. Therefore, the components having the same reference numerals can be applied with reference to the above embodiment. The waterproof seal portion 51 of the electronic device 10b is provided with a convex portion on one of the wall portion 21a and the housing 200b, and a concave portion facing the convex portion on the other side of the wall portion 21a and the housing 200b.

The case 20a is provided with a case-side convex portion 26 and a case-side groove portion 27 at positions on the wall portion 21a facing the flange portion 221a. That is, the case-side convex portion 26 and the case-side groove portion 27 are provided on the inner surface side of the wall portion 21a. The case-side convex portion 26 corresponds to the convex portion and is a portion protruding from the periphery. On the other hand, the case side groove portion 27 corresponds to a recess and is a portion recessed from the periphery.

The case-side convex portion 26 and the case-side groove portion 27 are provided in an annular shape so as to surround the fan mounting opening 25. Further, the case-side groove portion 27 is provided in an annular shape so as to surround the case-side convex portion 26. In the present embodiment, the case 20a provided with the case-side convex portion 26 is adopted as the opening end portion of the fan mounting opening 25.

The housing 200b is provided with a fan-side groove portion 222 and a fan-side convex portion 223 at positions on the flange portion 221a facing the wall portion 21a. The fan-side convex portion 223 corresponds to the convex portion and is a portion protruding from the periphery. On the other hand, the fan-side groove portion 222 corresponds to a recess and is a portion recessed from the periphery.

The fan-side groove portion 222 and the fan-side convex portion 223 are provided in an annular shape so as to surround the fan mounting opening 25 with the blower fan 100b mounted on the case 20a. Further, the fan-side convex portion 223 is provided in an annular shape so as to surround the fan-side groove portion 222.

In this embodiment, the housing 200b including the protruding portion 250 in which a part of the side wall end portion 211 protrudes is adopted. As a result, when the housing 200b is resin-molded using the mold, the housing 200b can be easily taken out from the mold. However, the housing 200b may not be provided with the protrusion 250.

The electronic device 10b is configured such that the case-side convex portion 26 and the fan-side groove portion 222 face each other, and the fan-side convex portion 223 and the case-side groove portion 27 face each other with the blower fan 100b attached to the case 20a. ing. That is, the electronic device 10b includes a portion having a concave-convex shape so that the flange portion 221a and the wall portion 21a mesh with each other in a state where the blower fan 100b is attached to the case 20a. However, the electronic device 10b is not limited to this, and at least one of the fan-side convex portion 223 and the case-side groove portion 27, and the fan-side groove portion 222 and the case-side convex portion 26 may be provided.

Similar to the electronic device 10, the electronic device 10b has a seal member 50 interposed in the facing portion between the flange portion 221a and the case 20a and the facing portion between the side wall end portion 211 (protruding portion 250) and the case 20a. The example is adopted. Therefore, the electronic device 10b is provided with a seal member 50 at a portion facing the case-side convex portion 26 and the fan-side groove portion 222, and at a portion facing the fan-side convex portion 223 and the case-side groove portion 27. However, the electronic device 10b is not limited to this, and is the entire circumference of the fan mounting opening 25, and is a part of the facing portion between the flange portion 221a and the case 20a and the facing portion between the side wall 210 and the case 20a. It suffices if the seal member 50 is provided.

The electronic device 10b can have the same effect as the electronic device 10. Further, the electronic device 10b is provided with a seal member 50 at a portion facing the case-side convex portion 26 and the fan-side groove portion 222, or at a portion facing the fan-side convex portion 223 and the case-side groove portion 27. Therefore, the electronic device 10b can have a longer distance between the internal space S1 and the external space at the portion where the case 20a and the housing 200b face each other than the electronic device 10. Therefore, the electronic device 10b can make the waterproof seal portion 51 wider than the electronic device 10. Therefore, the electronic device 10b can improve the waterproof performance as compared with the electronic device 10. It can be said that the electronic device 10b can suppress a leak path connecting the internal space S1 and the external space more than the electronic device 10.

(Fourth Embodiment)
A schematic configuration of the electronic device 10c according to the fourth embodiment will be described with reference to FIG. 7. Here, the points different from the electronic device 10a in the electronic device 10c will be mainly described. The electronic device 10c differs from the electronic device 10a in the configuration of the case 20b, the configuration of the blower fan 100c, and mainly the configuration of the housing 200c. In the electronic device 10c, the same reference numerals are given to the same components as those of the electronic device 10a. Therefore, the components having the same reference numerals can be applied with reference to the above embodiment.

The waterproof seal portion 51 of the electronic device 10c is provided with a convex portion on one of the wall portion 21b and the housing 200c, and a concave portion facing the convex portion on the other side of the wall portion 21b and the housing 200c. That is, the fourth embodiment can be regarded as an example in which the configuration (convex portion, concave portion) of the third embodiment is applied to the configuration of the second embodiment.

The case 20b is provided with a case-side convex portion 28 and a case-side groove portion 29 at positions on the wall portion 21b facing the intermediate portion 240a. That is, the case-side convex portion 28 and the case-side groove portion 29 are provided on the outer surface side of the wall portion 21b. The case-side convex portion 28 corresponds to the convex portion and is a portion protruding from the periphery. On the other hand, the case side groove 29 corresponds to a recess and is a portion recessed from the periphery.

The case-side convex portion 28 and the case-side groove portion 29 are provided in an annular shape so as to surround the fan mounting opening 25. Further, the case-side groove 29 is provided in an annular shape so as to surround the case-side convex portion 28. In the present embodiment, the case 20b provided with the case-side convex portion 28 is adopted as the opening end portion of the fan mounting opening 25.

The housing 200c is provided with a fan-side groove portion 241 and a fan-side convex portion 242 at positions in the intermediate portion 240a facing the wall portion 21b. The fan-side convex portion 242 corresponds to the convex portion and is a portion protruding from the periphery. On the other hand, the fan-side groove portion 241 corresponds to a recess and is a portion recessed from the periphery.

The fan-side groove portion 241 and the fan-side convex portion 242 are provided in an annular shape so as to surround the fan mounting opening 25 with the blower fan 100c mounted on the case 20b. Further, the fan-side convex portion 242 is provided in an annular shape so as to surround the fan-side groove portion 241.

The electronic device 10c is configured such that the case-side convex portion 28 and the fan-side groove portion 241 face each other, and the fan-side convex portion 242 and the case-side groove portion 29 face each other with the blower fan 100c attached to the case 20b. ing. That is, the electronic device 10c includes a portion having a concave-convex shape so that the intermediate portion 240a and the wall portion 21b mesh with each other in a state where the blower fan 100c is attached to the case 20b. However, the electronic device 10c is not limited to this, and it is sufficient that at least one of the fan-side convex portion 242 and the case-side groove portion 29, and the fan-side groove portion 241 and the case-side convex portion 28 is provided.

Similar to the electronic device 10a, the electronic device 10c employs an example in which the seal member 50 is interposed in the facing portion between the recess 230 and the case 20b in addition to the facing portion between the intermediate portion 240a and the case 20b. There is. For this reason, the electronic device 10c is provided with a seal member 50 at a portion facing the case-side convex portion 28 and the fan-side groove portion 241 and at a portion facing the fan-side convex portion 242 and the case-side groove portion 29. However, the electronic device 10c is not limited to this, and is the entire circumference of the fan mounting opening 25, and is a part of the facing portion between the recess 230 and the case 20b and the facing portion between the intermediate portion 240a and the case 20b. It suffices if the seal member 50 is provided.

The electronic device 10c can exhibit the same effects as the electronic device 10, the electronic device 10a, and the electronic device 10b.

(Fifth Embodiment)
A schematic configuration of the electronic device 10d according to the fifth embodiment will be described with reference to FIG. Here, the differences between the electronic device 10d and the electronic device 10b will be mainly described. The electronic device 10d differs from the electronic device 10b in the configuration of the circuit board 60a and the configuration of the blower fan 100d, mainly the configuration of the housing 200d. In the electronic device 10d, the same reference numerals are given to the same components as those of the electronic device 10b. Therefore, the components having the same reference numerals can be applied with reference to the above embodiment.

The electronic device 10d is fixed to the housing 200d and the circuit board 60a, and includes a substrate fixing portion 260 for fixing the position of the housing 200d with respect to the circuit board 60a in a plane direction orthogonal to the plate thickness direction of the circuit board 60a. The substrate fixing portion 260 is provided so as to project from the bottom portion 220 of the housing 200d in the direction of the circuit board 60a. The substrate fixing portion 260 is provided with a spring portion 261 at the tip thereof. The spring portion 261 is inserted into the fixing hole portion 64, which will be described later.

In this embodiment, the substrate fixing portion 260 provided integrally with the housing 200d is adopted. That is, the substrate fixing portion 260 includes a resin holding portion formed at the same time as the housing 200d and a spring portion 261 held by the holding portion. However, the substrate fixing portion 260 is not limited to this, and is provided separately from the housing 200d and may be attached to the housing 200d.

Further, in the present embodiment, the spring portion 261 is adopted as a portion to be inserted into the fixing hole portion 64. However, the present embodiment is not limited to this, and as a portion to be inserted into the fixing hole portion 64, when it is inserted into the fixing hole portion 64, it is deformed by the stress from the fixing hole portion 64 and its reaction force. Can be adopted even if it is an elastic portion that can apply the above to the circuit board 60a.

The circuit board 60a is provided with a fixing hole portion 64 into which the spring portion 261 of the substrate fixing portion 260 is inserted. The fixing hole portion 64 is a hole smaller than the diameter of the spring portion 261 in a state where it is not inserted into the fixing hole portion 64. In this embodiment, the fixing hole portion 64 that penetrates the printed circuit board in the plate thickness direction is adopted. However, the fixing hole portion 64 can be adopted even if it is a concave hole that does not penetrate the printed circuit board.

Here, the procedure for mounting the blower fan 100d on the circuit board 60a will be described. First, the spring portion 261 is inserted into the fixing hole portion 64, and the blower fan 100d is arranged on the circuit board 60a. When the spring portion 261 is inserted into the fixing hole portion 64, the spring portion 261 is deformed by the stress from the fixing hole portion 64. Then, the blower fan 100d is fixed to the circuit board 60a by the reaction force to the circuit board 60a when the spring portion 261 is deformed. At this time, the terminal 140 is only inserted into the through hole 62 and is not fixed by the connecting member 63. Therefore, it can be said that the blower fan 100d is temporarily fixed to the circuit board 60a.

Then, the blower fan 100d is temporarily fixed to the circuit board 60a, and the terminal 140 and the circuit board 60a are electrically connected by the connecting member 63. As a result, the blower fan 100d is fixed to the circuit board 60a. Then, as described in the first embodiment, the circuit board 60a is attached to the case 20.

The electronic device 10d can have the same effect as the electronic device 10b. Further, since the electronic device 10d has the spring portion 261 inserted into the fixing hole portion 64, the blower fan 100d can be temporarily fixed to the circuit board 60a. Therefore, the electronic device 10d can perform positioning when the blower fan 100d is mounted on the circuit board 60a. That is, the electronic device 10d can perform positioning in the XY plane direction when the terminal 140 and the circuit board 60a are electrically connected by the connecting member 63.

The substrate fixing portion 260 can also be applied to the electronic devices 10, 10a and 10c. Further, the substrate fixing portion 260 can also be applied to the electronic devices 10f to 10g described later. In this case, each electronic device includes a circuit board 60a provided with a fixing hole portion 64.

(Sixth Embodiment)
A schematic configuration of the electronic device 10e according to the sixth embodiment will be described with reference to FIG. Here, the points different from the electronic device 10b in the electronic device 10e will be mainly described. The electronic device 10e differs from the electronic device 10b in the configuration of the blower fan 100e, mainly the configuration of the press-fit terminal 141. In the electronic device 10e, the same reference numerals are given to the same components as those of the electronic device 10b. Therefore, the components having the same reference numerals can be applied with reference to the above embodiment.

The blower fan 100e includes a press-fit terminal 141 as a terminal for electrically connecting to the circuit board 60. The press-fit terminal 141 is a well-known technique and includes a portion to be press-fitted into the through hole 62. When the press-fit terminal 141 is inserted into the through hole 62, the press-fit terminal 141 is deformed by the stress from the circuit board 60, and the reaction force thereof can be applied to the circuit board 60. The portion press-fitted into the through hole 62 can be said to be an elastic portion for terminals or a spring portion for terminals. The press-fit terminal 141 corresponds to an electrical connection terminal and a press-fit terminal. The through hole 62 corresponds to an insertion hole.

The electronic device 10e can have the same effect as the electronic device 10b. Further, in the electronic device 10e, since the blower fan 100e has the press-fit terminal 141, the blower fan 100e can be positioned when it is mounted on the circuit board 60a without providing the board fixing portion 260. That is, the electronic device 10e can exert the same effect as the electronic device 10d.

The press-fit terminal 141 can also be applied to the electronic device 10 and the electronic devices 10a to 10d. Further, the substrate fixing portion 260 can also be applied to the electronic device 10 g described later.

(7th Embodiment)
A schematic configuration of the electronic device 10f according to the seventh embodiment will be described with reference to FIG. Here, the points different from the electronic device 10e in the electronic device 10f will be mainly described. The electronic device 10f differs from the electronic device 10e in the configuration of the blower fan 100f, mainly the configuration of the housing 200e and the press-fit terminal 142. In the electronic device 10f, the same reference numerals are given to the same components as those of the electronic device 10e. Therefore, the components having the same reference numerals can be applied with reference to the above embodiment.

The press-fit terminal 142 includes a support portion 143 that is a portion that protrudes in the XY plane direction from the periphery in addition to the portion that is press-fitted into the through hole 62. That is, the press-fit terminal 142 includes a support portion 143 that protrudes in a direction orthogonal to the direction in which the press-fit terminal 142 is inserted into the through hole 62 (hereinafter, the insertion direction). The support portion 143 is provided to prevent the press-fit terminal 142 from moving in the direction opposite to the insertion direction.

The housing 200e includes a protrusion 270 at a portion facing the circuit board 60. That is, the protrusion 270 is provided on the bottom 220. Further, the protrusion 270 protrudes toward the circuit board 60 from the periphery in a state where the blower fan 100f is mounted on the circuit board 60. Therefore, it can be said that the protrusion 270 is thicker than the periphery of the bottom 220. The protrusion 270 is provided around each press-fit terminal 142. That is, each press-fit terminal 142 is provided so as to project from the protrusion 270.

In this embodiment, the protrusion 270 provided integrally with the housing 200e is adopted. That is, the protrusion 270 is a resin portion formed at the same time as the housing 200e. However, the protrusion 270 is not limited to this, and is provided separately from the housing 200e and may be attached to the housing 200e.

The support portion 143 is supported by a portion of the housing 200e that faces the circuit board 60. More specifically, the press-fit terminal 142 is provided so that the support portion 143 is in contact with the internal space S1 side of the protrusion 270.

The electronic device 10f can have the same effect as the electronic device 10e. Further, the blower fan 100f includes a support portion 143 supported by the housing 200e. Therefore, in the blower fan 100f, the stress generated by inserting the press-fit terminal 142 into the through hole 62 is applied to the housing 200e.

Therefore, the electronic device 10f can suppress the stress applied to the fan circuit board 130 when the press-fit terminal 142 is inserted into the through hole 62. Therefore, the electronic device 10f can suppress an abnormality caused by applying stress to the fan circuit board 130.

Further, the housing 200e may not be provided with the protrusion 270. However, in the housing 200e, when the protrusion 270 is provided, the thickness of the bottom 220 can be partially increased. The housing 200e can receive stress from the press-fit terminal 142 at the protruding portion 270 having an increased thickness, and can suppress the occurrence of cracks and the like.

(8th Embodiment)
The schematic configuration of the electronic device 10g according to the eighth embodiment will be described with reference to FIG. Here, the points different from the electronic device 10f in the electronic device 10g will be mainly described. The electronic device 10g differs from the electronic device 10f in the configuration of the blower fan 100g, mainly the configuration of the housing 200f. In the electronic device 10g, the same reference numerals are given to the same components as those of the electronic device 10f. Therefore, the components having the same reference numerals can be applied with reference to the above embodiment.

The housing 200f is provided with a protrusion 280 like the housing 200e. However, the protrusion 280 is provided with a rattling prevention portion 281 that comes into contact with the circuit board 60 when the blower fan 100 g is mounted on the circuit board 60. That is, the backlash prevention portion 281 is a portion that protrudes from the protrusion 280 toward the circuit board 60 in a state where the blower fan 100 g is mounted on the circuit board 60. The backlash prevention unit 281 is in contact with the surface of the circuit board 60 facing the housing 200f, and can define the distance between the housing 200f and the circuit board 60. The backlash prevention unit 281 corresponds to a regulation unit.

Further, the backlash prevention portion 281 is provided around the support portion 143 in the protrusion 280. Therefore, the backlash prevention unit 281 comes into contact with the periphery of the through hole 62 in the circuit board 60.

In this embodiment, the rattling prevention portion 281 provided integrally with the housing 200f is adopted. That is, the backlash prevention portion 281 is a resin portion formed at the same time as the housing 200f. However, the backlash prevention portion 281 is not limited to this, and is provided separately from the housing 200f and may be attached to the housing 200f.

The electronic device 10g can have the same effect as the electronic device 10f. Further, since the electronic device 10g includes the backlash prevention unit 281, it is possible to prevent the blower fan 100g from wobbling when the blower fan 100g is mounted on the circuit board 60. Therefore, the electronic device 10 g can improve the assembling accuracy when assembling the case 20 to the blower fan 100 g. That is, the electronic device 10g suppresses contact between the blower fan 100g and the case 20a when the blower fan 100g is inserted into the fan mounting opening 25 or after the blower fan 100g is inserted into the fan mounting opening 25. can. As a result, the electronic device 10g can prevent the sealing member 50 from deteriorating the waterproof property.

The same effect can be obtained even with the electronic device 10d. However, unlike the electronic device 10d, the electronic device 10g does not need to provide the fixing hole portion 64 in the circuit board 60. Therefore, the electronic device 10g can suppress the mounting area of the circuit board 60 from becoming smaller than that of the electronic device 10d.

The backlash prevention portion 281 may be provided around the protrusion 280. Further, the backlash prevention unit 281 may be applied to electronic devices 10, 10a to 10e and the like. However, when the housing 200f is provided with the rattling prevention portion 281 around the support portion 143 of the protrusion 280, the dead space around the through hole 62 can be effectively utilized to suppress wobbling.

10,10a-10g ... Electronic device, 20,20a ... Case, 21,21a ... Wall part, 22 ... Connector mounting part, 23 ... Body fixing part, 24 ... Housing fixing hole, 25 ... Fan mounting opening, 30 ... Cover, 31 ... Heat dissipation fin, 40 ... Connector, 50 ... Seal member, 51 ... Waterproof seal part, 60 ... Circuit board, 61 ... Circuit element, 62 ... Through hole, 63 ... Connection member, 100, 100a-100g ... Blower fan , 110 ... Shaft, 120 ... Blade, 130 ... Fan circuit board, 140 ... Terminal, 150 ... Potting, 200, 200a-200f ... Housing, 201 ... Opening, 210 ... Side wall, 211 ... Side wall end, 212 ... Vent, 220 ... Bottom, 221 ... Flange

Claims (9)

An electronic device mounted on a vehicle
A waterproof housing (20, 20a, 30) having a wall portion (21, 21a) formed with a through hole (25), and a waterproof housing (20, 20a, 30).
The circuit board (60) housed in the internal space of the waterproof housing and
A housing (200) that rotatably accommodates the blade portion (120) and the blade portion, and is arranged in the wall portion so as to close the through hole while having a portion facing the outer surface or the inner surface of the wall portion. And an electrical connection terminal (140 to 142) protruding from the housing into the internal space, and on the outer surface via vents (201, 212) provided in the housing as the blades rotate. A blower unit (100) that forms a flow of air along it,
A sealing member (50) is interposed between the wall portion and the housing, and has a waterproof sealing portion (51) that watertightly seals around the through hole.
The blower unit is provided at a position where the electrical connection terminal is surrounded by the waterproof seal portion, and is electrically connected to the circuit board via the electrical connection terminal .
The housing has a first vent whose at least a part is located above the blade portion in the rotation axis direction of the blade portion and at least a part below the blade portion in the rotation axis direction as the ventilation port. An electronic device having a plurality of second vents formed so as to be located on the waterproof housing side and opened in different directions from each other. The blower unit, an electronic device according to claim 1, before Kikai rotating shaft direction is disposed in the wall portion in a state that matches the thickness direction of the circuit board. The electronic device according to claim 1 or 2, wherein the housing has a portion facing the inner surface and is arranged on the wall portion so as to close the through hole. The electronic device according to claim 1 or 2, wherein the housing has a portion facing the outer surface and is arranged on the wall portion so as to close the through hole. Claims 1 to 4 of the waterproof seal portion, wherein a convex portion is provided on one of the wall portion and the housing, and a concave portion facing the convex portion is provided on the other side of the wall portion and the housing. The electronic device according to any one item. Claims 1 to 5 provided with a fixing portion (260) fixed to the housing and the circuit board and fixing the position of the housing with respect to the circuit board in a plane direction orthogonal to the plate thickness direction of the circuit board. The electronic device according to any one of the above. The circuit board is provided with an insertion hole (62) into which the electrical connection terminal is inserted and is electrically connected to the electrical connection terminal.
The electronic device according to any one of claims 1 to 6, wherein the electrical connection terminal is a press-fit terminal including a portion to be press-fitted into the insertion hole. The electronic device according to claim 7, wherein the electrical connection terminal includes a support portion (143) supported at a portion of the housing facing the circuit board. The electronic device according to any one of claims 1 to 8, which is in contact with a surface of the circuit board facing the housing and includes a defining portion (281) that defines a distance between the housing and the circuit board.

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