JP2016115871A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of reducing the number of components and assembly man-hours.SOLUTION: An electronic apparatus 100 includes a heating component 12, a heat dissipation member 11, and a case 10. The heating component 12 is arranged on the heat dissipation member 11. The case 10 has a fixing part 17 for pressing and fixing the heating component 12 to the heat dissipation member 11, and is assembled to the heat dissipation member 11. Since the case 10 has the fixing part 17, the number of components can be reduced, and the assembly man-hours can also be reduced.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electronic device including a heat generating component.

  In recent years, an electronic control unit (ECU) including a power system board on which a power circuit is mounted and a control system board that generates a control signal is used as a control unit for electric power steering. The ECU drives, for example, a motor for assisting the driver's steering force based on outputs from a steering torque sensor, a vehicle speed sensor, and the like. For example, a heat-generating switching element such as a power MOSFET is used as a component constituting the circuit for driving the motor. For this reason, in the ECU, a heat sink for dissipating heat generated by the heat generating component is provided at the bottom, and a case configured as a side wall of a housing or the like is disposed around the heat sink.

  For example, Patent Document 1 describes a current switching circuit device having a plurality of switching transistors. In this current switching circuit device, each of the plurality of switching transistors is fixed to the heat sink by screws.

  However, when the number of heat generating components increases, the number of man-hours increases if each of the plurality of heat generating components is fixed with screws. Therefore, Patent Document 2 describes a metal fitting capable of pressing a plurality of heat generating components against a heat sink.

JP 2003-309384 A JP 2013-214770 A

  However, when the metal fitting described in Patent Document 2 is used, the number of parts is increased, and the number of assembly steps is increased because the metal fitting is attached. Further, when the number of heat generating parts is further increased, each of the many heat generating parts has to be sandwiched between the fixing portion of the metal fitting and the heat sink, which may increase the number of assembling steps.

  In view of the circumstances as described above, an object of the present invention is to provide an electronic device capable of reducing the number of parts and the number of assembly steps.

In order to achieve the above object, an electronic device according to an embodiment of the present invention includes a heat generating component, a heat radiating member, and a case.
The heat dissipating member is provided with the heat generating component.
The case includes a fixing portion that presses and fixes the heat generating component against the heat radiating member, and is assembled to the heat radiating member.

  According to the said structure, since a case has a fixing | fixed part, a number of parts can be reduced. Furthermore, since it is possible to save the trouble of attaching a fixing bracket or the like, which has been a problem in the past, to a heat sink or a case, the number of assembly steps can be reduced.

Specifically, the case further includes a support portion that supports the fixing portion and is formed integrally with the fixing portion.
The fixed part is
A rod-shaped connecting portion extending from the support portion toward the heat generating member;
And an end portion connected to the connecting portion and contacting the heat-generating component.

  According to the said structure, since a connection part is rod-shaped, the intensity | strength of the whole fixing | fixed part can be raised. Furthermore, by assembling the support portion after the heat generating component is disposed on the heat radiating member, the fixing portion is relatively deformed with respect to the support portion, and the heat generating component can be pressed by the elastic force. Thereby, an assembly man-hour can be reduced more.

  Furthermore, the fixing portion may be formed of a resin molded body that is formed integrally with the support portion.

  Thereby, a support part and a fixing part can be formed easily. Further, the fixing portion can be formed of a material having appropriate elasticity, and the heat generating component can be fixed by the elastic force of the fixing portion. Furthermore, the fixing portion can be formed of an insulating material, and problems such as short circuits can be prevented.

Alternatively, the support portion is formed of a resin material,
The fixing portion may be formed of a metal material that is insert-molded integrally with the support portion.

  Thereby, the intensity | strength of a fixing | fixed part can be raised and a stronger pressing force can be exerted with respect to a heat-emitting component.

Further, the heat generating component has a hole,
The end may be configured to engage with the hole.

  Thereby, a fixing | fixed part and a heat-emitting component can be engaged reliably, and a heat-generating component can be fixed more stably.

Further, the heat generating component is disposed at a peripheral edge of the heat dissipation member,
The support part has a side wall part arranged at the peripheral part of the heat dissipation member,
The fixing portion may be formed on the side wall portion.

  Thereby, a fixing | fixed part can be arrange | positioned in the vicinity of a heat-emitting component, and a stronger pressing force can be exerted on the heat-generating component.

The electronic device further includes a circuit board electrically connected to the heat generating component,
The case may further include a housing portion that is surrounded by the side wall portion and houses the circuit board, and a connector formed on the side wall portion.

  As a result, the case can also serve as a connector for housing the circuit board and the connector, and the number of components can be further reduced.

Alternatively, the electronic device includes a plurality of heat generating components,
The case may include a plurality of fixing portions that correspond one-to-one to the plurality of heat generating components.

  Thereby, even if the number of heat generating components increases, each heat generating component can be reliably pressed by each fixing portion, and each heat generating component can be stably fixed.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which can reduce a number of parts and an assembly man-hour can be provided.

It is a perspective view which shows the electronic device which concerns on the 1st Embodiment of this invention. It is a disassembled perspective view of the said electronic device. It is the principal part perspective view which removed the case of the said electronic device. It is a perspective view which shows the main body of the said case. It is principal part sectional drawing which shows the structural example of the fixing | fixed part of the said electronic device. It is a figure which shows the other structural example of the fixing | fixed part of the said electronic device, A is principal part sectional drawing, B is a principal part perspective view. It is a principal part perspective view of the electronic device which concerns on the 2nd Embodiment of this invention. It is principal part sectional drawing of the said electronic device. It is principal part sectional drawing of the electronic device which concerns on the modification of the said embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figure, the X axis, Y axis, and Z axis indicate three axes orthogonal to each other, the X axis and Y axis directions indicate the in-plane direction, and the Z axis direction indicates the thickness direction (vertical direction).

<First Embodiment>
[Overview of electronic equipment]
The electronic device according to the present embodiment is used as an electronic control unit (ECU) for electric power steering, for example. The electric power steering system is a mechanism that assists the steering of the vehicle driver by controlling a motor for assisting the steering force of the driver based on the steering torque of the steering wheel and the vehicle speed. The electronic device controls the driving of the motor based on output from a torque sensor, a vehicle speed sensor, or the like. Hereinafter, the configuration of the electronic apparatus will be described.

[Configuration of electronic equipment]
FIG. 1 is a perspective view showing an electronic apparatus according to the first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the electronic apparatus. The electronic device 100 is formed in, for example, a rectangular parallelepiped shape as a whole, and includes a heat radiating member 11, a plurality of heat generating components 12, a circuit board 13, and a case 10.

  The heat dissipating member 11 is a heat sink that constitutes the bottom of the electronic device 100, and may be formed of aluminum, for example. A plurality of heat generating components 12 are arranged on the heat radiating member 11. The heat radiating member 11 includes a central portion 111 facing the circuit board 13 and a peripheral edge portion 112 around the central portion 111, and is configured in a rectangular plate shape as a whole. The central portion 111 may be formed in a concave shape in the present embodiment, and an electronic component or the like (not shown) may be disposed. The peripheral portion 112 is configured to be flat, for example.

  The heat generating component 12 is configured as a semiconductor switching element such as a power MOSFET, for example, and is disposed on the heat dissipation member 11. In the present embodiment, the heat generating component 12 is arranged in the peripheral portion 112. The interval between adjacent heat generating components 12 may or may not be constant. The number of heat generating components 12 is not particularly limited, and can be appropriately selected according to the circuit configuration. Moreover, the heat-emitting component 12 can be arrange | positioned through the heat dissipation sheet which is not shown in figure on the heat radiating member 11, for example. The heat dissipation sheet may have adhesiveness, for example.

  FIG. 3 is a perspective view of the main part of the electronic device 100 with the case 10 removed. As shown in the figure, the heat generating component 12 includes a main body 121 and a terminal 122 extending from the main body 121. The main body 121 is typically configured in a substantially rectangular parallelepiped shape as a whole, in which elements are sealed with a mold resin. The terminal 122 includes, for example, three terminals of a gate, a drain, and a source, and is configured in a pin shape. The terminal 122 extends, for example, in a direction substantially parallel to the X-axis direction, and then bends upward in the Z-axis direction. In FIG. 2, the terminal 122 is not shown.

  The main body 121 of the heat generating component 12 has a front surface 123, a back surface 124, and a peripheral surface 125 that connects these. A screw hole 126 as a hole may be formed on the surface 123. The back surface 124 is configured as a heat generating surface and is in contact with the heat radiating member 11. A terminal 122 protrudes from the peripheral surface 125.

  With reference to FIG. 2, the circuit board 13 is configured as a power board for driving the motor in the present embodiment. That is, the circuit board 13 is a wiring board that is electrically connected to the heat generating component 12 that is a switching element, and the circuit board 13 includes a bridge circuit including these heat generating components 12. The circuit board 13 may be a glass epoxy board or a metal board made of aluminum or the like.

  The circuit board 13 is accommodated in an accommodating portion 152 of the main body 15 described later, and is disposed to face the central portion 111 of the heat dissipation member 11. As shown in FIG. 3, the circuit board 13 is connected to the terminal 122 bent upward in the Z-axis direction, and thus is disposed above the surface of the peripheral edge 112 in the present embodiment. A through hole (not shown) through which the terminal 122 can be inserted is formed in the circuit board 13, and the terminal 122 inserted through the through hole can be soldered to the circuit board 13. As a result, the circuit board 13 can be electrically connected to the heat generating component 12. Moreover, the length of the terminal 122 should just be a length of the extent which the circuit board 13 and the heat radiating member 11 do not contact. Moreover, the circuit board 13 may be supported by a protrusion (not shown) provided on the heat dissipation member 11 as an example. The height of the protrusion is configured to be higher than the thickness of the heat generating component 12, for example. In the present embodiment, the central portion 111 is configured in a concave shape, so that even if the terminal 122 is configured to be short, the circuit board 13, components mounted on the circuit board 13, or the like cannot be brought into contact with the heat dissipation member 11. .

Furthermore, the electronic device 100 according to the present embodiment may include the control board 14 accommodated in the accommodating portion 152 of the main body 15 described later.
The control board 14 is a wiring board on which a microcomputer for controlling a bridge circuit and the like mounted on the circuit board 13 and peripheral circuit elements are mounted, and is electrically connected to the circuit board 13. The control board 14 is disposed, for example, above the circuit board 13 and can be configured in a rectangular shape having the same size as the circuit board 13 in plan view. The control board 14 may be a glass epoxy board.

  The case 10 is configured as a housing of the electronic device 100 and includes, for example, a main body 15, a lid portion 16, and a fixing portion 17. In this embodiment, the case 10 is assembled to the heat radiating member 11 constituting the bottom portion through a seal ring (not shown). The fixing structure of the case 10 and the heat radiating member 11 is not particularly limited, and typically, using a plurality of fasteners such as screws and bolts inserted through the four corners of the case 10 (the main body 15 and the lid portion 16), Case 10 and heat dissipation member 11 are coupled to each other.

  The main body 15 functions as a support portion 18 that supports the fixing portion 17 and is formed integrally with the fixing portion 17 in the present embodiment. The main body 15 is disposed on the heat radiating member 11, and more specifically, is disposed so as to surround the heat generating component 12 along the periphery of the heat radiating member 11. The material of the main body 15 is selected in view of heat resistance and rigidity, and may be a resin such as PPS (polyphenylene sulfide resin) or PBT (polybutylene terephthalate resin).

FIG. 4 is a perspective view showing the main body 15.
The main body 15 has a side wall 151 and is configured in a frame shape as a whole. The side wall 151 constitutes a side surface of the electronic device 100 and is disposed along the peripheral edge 112 of the heat dissipation member 11. Although not shown, the side wall 151 may be integrally formed with a connection member that can connect the circuit board 13 and the control board 14. The connection member may include a bus bar, for example, and may be configured to connect each of the circuit board 13 and the control board 14 to the connection member. Alternatively, the connection member may include a flexible substrate, for example, and may be configured to be able to connect the circuit board 13 and the control board 14 to each other.

The main body 15 further includes a housing part 152 surrounded by the side wall part 151 and a plurality of connectors 153 formed on the side wall part 151.
The accommodating portion 152 accommodates the heat generating component 11, the circuit board 13, and the control board 14.
The connector 153 includes a connector terminal (not shown), and is electrically connected to the circuit board 13, the control board 14, and the like, and can be connected to an external part such as a torque sensor, a vehicle speed sensor, and a motor (not shown). Thereby, the connection between these external components and the circuit board 13, the control board 14, etc. is securable. Since the main body 15 has the connector 153, it is not necessary to assemble a separate part for the connector, the number of parts can be reduced, and the number of assembling steps can be reduced.

  As shown in FIG.1 and FIG.2, the cover part 16 is arrange | positioned on the main body 15 through the seal ring which is not shown in figure. The lid portion 16 constitutes the upper surface of the electronic device 100 and may be configured in a rectangular shape having substantially the same size as the heat dissipation member 11 and the main body 15 in plan view. The material of the lid portion 16 is also selected in view of heat resistance and rigidity, but like the main body 15, it may be a resin such as PPS or PBT, or may be a metal.

  As shown in FIG. 4, the fixing portion 17 is formed integrally with the main body 15, and presses and fixes the heat generating component 12 to the heat radiating member 11 when the main body 15 is assembled to the heat radiating member 11. The fixing portion 17 is formed on the side wall portion 151 and is formed of, for example, a resin molded body that is formed integrally with the main body 15 (supporting portion 18). In addition, the fixed portion 17 has a distance along the Z-axis direction between a portion that contacts the heat-generating component 12 (an end portion 172 described later in the present embodiment) and a bottom surface disposed on the heat dissipation member 11 of the main body 15. It is comprised so that it may become below the thickness of the heat-emitting component 12. FIG.

  In the present embodiment, as will be described later, after the heat generating component 12 is disposed between the fixing portion 17 and the heat radiating member 11, the case 10 is assembled to the heat radiating member 11 using a plurality of screws or the like. At this time, the end of the fixing portion 17 that contacts the heat generating component 12 is deformed upward relative to the main body 15, and the heat generating component 12 is sandwiched between the fixing portion 17 and the heat radiating member 11 by the elastic force. The As a result, the heat generating component 12 is pressed and held on the peripheral edge 112 of the heat radiating member 11. Furthermore, since the fixing portion 17 is integrally formed with the main body 15, the main body 15 can be easily formed, and since the fixing portion 17 is formed of an insulator, a short circuit between the fixing portion 17 and the heat generating component 12, etc. Problems can be prevented.

  In the present embodiment, the case 10 has a plurality of fixing portions 17. These fixing portions 17 are arranged on the inner peripheral surface of the main body 15 and can be arranged to correspond to each of the plurality of heat generating components 12 on a one-to-one basis, for example. Thereby, even when the number of the heat generating components 12 is increased, each of the fixing portions 17 can stably fix the heat generating components 12.

The fixing portion 17 includes a connection portion 171 and an end portion 172 in the present embodiment.
The connecting portion 171 extends from the main body 15 (supporting portion 18) toward the heat radiating member 11, and is configured in a rod shape. In the present embodiment, the connecting portion 171 extends in a direction that forms an acute angle with the inner surface of the side wall portion 151, and is configured to extend obliquely downward from the main body 15. The connection part 171 may have substantially the same cross-sectional area orthogonal to the extending direction or may be different.
The end portion 172 is connected to the connection portion 171 and abuts against the heat generating component 12. The end portion 172 can take various configurations as described below.

[Configuration example of fixed part]
FIGS. 5 and 6 are diagrams showing a configuration example of the fixing portion 17. FIGS. 5A, 5 </ b> B, and 6 </ b> A are main part sectional views, and FIG. 6B is a main part perspective view. 5 and 6A, the illustration of the terminal 122 of the heat generating component 12 is omitted. Each of the fixing portions 17A, 17B, and 17C shown in these drawings has a connection portion 171 having the same configuration, but the shapes of the end portions 172A, 172B, and 172C are different.

  An end 172A of the fixing portion 17A shown in FIG. 5A is configured to bend downward in the Z-axis direction from a connection portion 171 extending obliquely downward from the main body 15, and abuts the surface 123 of the heat generating component 12 by the end surface. With the fixing portion 17A having such a configuration, the contact area between the end portion 172A and the heat generating component 12 can be reduced, and the heat generating component 12 can be pressed downward in the Z-axis direction with a relatively strong pressure.

  An end 172B of the fixing portion 17B shown in FIG. 5B is bent to a side parallel to the X-axis direction from the connecting portion 171 extending obliquely downward, and has a shape along the surface 123 of the heat generating component 12. That is, the end portion 172B contacts the surface 123 of the heat generating component 12 by the side surface. With the fixing portion 17B having such a configuration, the heat generating component 12 can be contacted with a relatively large area, and the heat generating component 12 can be stably fixed.

  The end portion 172C of the fixing portion 17C shown in FIGS. 6A and 6B is formed in a substantially disk shape connected to the tip of the connection portion 171 extending obliquely downward, and can be engaged with the screw hole 126 of the heat generating component 12. Can be configured. With the fixing portion 17C having such a configuration, the heat generating component 12 can be pressed downward, and the fixing portion 17C can be firmly engaged with the heat generating component 12, thereby fixing the heat generating component 12 more stably. The shape of the end portion 172C is not limited to a substantially disk shape, and various structures that engage with the screw hole 126 can be adopted.

  Then, the manufacturing method of the electronic device 100 of the said structure is demonstrated.

[Manufacturing method of electronic equipment]
First, referring to FIG. 3, the heat radiating member 11 is prepared. Subsequently, the heat generating component 12 is disposed on the peripheral edge 112 of the heat radiating member 11. At this time, a heat radiating sheet (not shown) may be disposed at a predetermined position of the heat radiating member 11, and the heat generating component 12 may be disposed on the heat radiating sheet. Moreover, the position of the heat-emitting component 12 can be provisionally determined by using an adhesive heat dissipation sheet. Then, the terminal 122 is inserted into the circuit board 13, and the circuit board 13 is disposed above the central portion 111.

  Subsequently, the main body 15 is disposed on the heat radiating member 11 so that the plurality of fixing portions 17 (17C) are positioned on the respective heat generating components 12. Thereafter, the circuit board 13 and the connector 153 are connected.

  Next, referring to FIG. 2, the control board 14 is arranged above the circuit board 13 in the Z-axis direction, and wiring necessary for driving the electronic device 100 is secured. Finally, the lid portion 16 is disposed on the side wall portion 151 of the main body 15, and the whole is screwed together with screws or the like penetrating the heat radiating member 11, the main body 15 and the lid portion 16.

  When the main body 15 is assembled to the heat radiating member 11 with screws or the like, the fixing portion 17 is elastically deformed by contact with the heat generating component 12, and each heat generating component 12 is fixed between the fixing member 17 and the heat radiating member 11 by the elastic force. Sandwiched between. The elastic force of the fixing part 17 is set to a value sufficient to stably position and hold the heat generating component 12 on the heat radiating member 11. Further, the pressing force of each fixing portion 17 may be adjusted at the screw fastening position. For example, the screw holes are not limited to the example formed only at the four corners of the main body 15, and a plurality of screw holes may be formed at predetermined intervals on the side wall portion 151 where the fixing portion 17 is disposed. The main body 15 is not limited to the example in which the main body 15 is screwed to the heat radiating member 11 together with the lid portion 16 as described above, and may be screwed to the heat radiating member 11 separately from the lid portion 16 before the lid portion 16 is disposed. Good.

[Effects of electronic equipment]
As described above, according to the electronic apparatus 100 according to the present embodiment, the fixing portion 17 that fixes the heat generating component 12 is configured integrally with the main body 15, so that the number of parts is reduced and the fixing portion 17 is connected to the main body 15. This saves the trouble of attaching to the camera.

  Furthermore, since the connecting portion 171 of the fixing portion 17 is configured in a rod shape, each of the plurality of fixing portions 17 is pressed against the heat generating component 12 when the main body 15 is assembled to the heat radiating member 11. The trouble of fixing each of 12 can be saved. As a result, it is possible to significantly reduce the number of assembly steps without providing a process for fixing the heat generating component 12 separately from the main body arranging process, as in the case of using a fixing bracket or screwing the heat generating component 12. it can. Therefore, the cost for manufacturing the electronic device 100 can be suppressed and the productivity can be increased.

  In addition, the heat generating component 12 can be easily fixed by the fixing portion 17 formed in the main body 15 by being arranged at the peripheral edge portion 112. Further, since the fixing portion 17 is formed on the side wall portion 151, the fixing portion 17 can be disposed closer to the heat generating component 12 disposed on the peripheral edge portion 112 of the heat radiating member 11. Thereby, it is set as the structure which the fixing | fixed part 17 tends to exert a pressing force with respect to the heat-emitting component 12, and the heat-generating component 12 can be fixed stably.

<Second Embodiment>
FIG. 7 is a perspective view of main parts of an electronic device 200 according to the second embodiment of the present invention, and FIG. 8 is a cross-sectional view of main parts of the electronic device 200. As shown in these drawings, the electronic device 200 includes a heat radiating member 21, a plurality of heat generating components 22, a circuit board 23, and a case 20. In addition, the same code | symbol is attached | subjected about the structure similar to the above-mentioned 1st Embodiment, and the description is abbreviate | omitted.

  The heat radiating member 21 has a central portion 211 that faces the circuit board 23 and a peripheral edge portion 212 around the central portion 211. In the present embodiment, a mounting table 213 on which the electronic component 22 is mounted is formed on the peripheral portion 212.

  The heat generating component 22 is disposed on the mounting table 213 and has a main body 221 and a terminal 222 extending from the main body 221, similarly to the heat generating component 12. Unlike the terminal 122, the terminal 222 is bent downward in the Z-axis direction.

The case 20 includes a main body 25, a lid portion (not shown in FIGS. 7 and 8) 16, and a fixing portion 27.
The main body 25 also functions as a support portion 28 that supports the fixing portion 27 and is formed integrally with the fixing portion 27 in this embodiment. The main body 25 is disposed on the heat radiating member 21 and is formed of a resin material. The main body 25 includes a side wall portion 251 and a housing portion 252. The side wall part 251 is arranged along the periphery of the heat radiating member 21, and a part thereof is arranged around the mounting table 213. The accommodating part 252 is surrounded by the side wall part 251 and accommodates a circuit board 23 described later.

  The fixing portion 27 is formed integrally with the main body 25 and presses and fixes the heat generating component 22 to the heat radiating member 21. In this embodiment, the fixing | fixed part 27 is formed with the metal material insert-molded integrally with the resin-made main bodies 25 (support part 28). Thereby, the intensity | strength of the fixing | fixed part 27 can be raised and the heat-emitting component 22 can be pressed with stronger force. Further, since the fixing portion 27 is formed of a material different from the constituent material of the main body 25 (supporting portion 28), the degree of freedom of the material of the fixing portion 27 is increased, and a desired strength and elastic force as the material of the fixing portion 27 are obtained. A material that can be obtained can be used.

  The fixing part 27 has a connection part 271 and an end part 272, similarly to the fixing part 17 described above. The connection part 271 extends from the main body 25 (support part 28) toward the heat radiating member 21, and is configured in a rod shape. The end portion 272 is connected to the connection portion 271 and abuts against the heat generating component 22.

The circuit board 23 is electrically connected to the heat generating component 22 and is accommodated in the accommodating portion 252. The circuit board 23 is disposed opposite to the central portion 211 of the heat radiating member 21 in the same manner as the circuit board 13 and is disposed below the surface of the mounting table 213 in the Z-axis direction as shown in FIG. Is done.
Although not shown, the electronic device 200 may include a control board.

  Also with the electronic apparatus 200 having such a configuration, it is possible to reduce the number of parts and the number of assembly steps. Moreover, the fixing | fixed part 27 can be arrange | positioned in the vicinity of the heat generating component 22 arrange | positioned at the peripheral part 212 of the thermal radiation member 21, and the heat generating component 12 can be fixed stably.

[Modification]
The shape of the fixing portion is not limited to the shape described in the above embodiment.
For example, like the fixing portion 17D shown in FIG. 9, after the rod-shaped connecting portion 171D extends substantially parallel to the X-axis direction, it may be bent downward in the Z-axis direction. In this case, the end portion 172D includes, for example, the end surface of the fixed portion 17D.

  In addition to this, although not shown in the drawings, each connecting portion may have a plurality of branch portions extending from the main body and a plurality of branch portions and one joint portion connected to one end portion. it can. Moreover, each connection part can also be set as the structure which has one junction part extended from the main body and several branch parts branched from the junction part and each connected to the edge part.

  Alternatively, although not illustrated, a part or the whole of the fixing portion may be configured by a spring member. Also with such a fixing portion, the heat generating component 12 can be fixed by an elastic force.

  Moreover, it is not limited to the structure by which the fixing | fixed part 17 is arrange | positioned at the side wall part 151. FIG. For example, when the main body is configured integrally with the lid portion, a fixing portion may be formed on the lid portion.

  Or the structure which fixes a several heat-emitting component with one fixing | fixed part may be sufficient, and a some fixing | fixed part may respond | correspond with respect to one heat-emitting component conversely.

  In the above-described embodiment, an example in which the hole portion of the heat generating component is configured as a screw hole is shown, but the present invention is not limited to this, and a hole that does not function as a screw hole may be used. Moreover, a through-hole as shown in FIG. 6 may be sufficient and the hole which does not penetrate may be sufficient.

  In the above-described embodiment, it has been described that the heat generating component 12 is disposed on the peripheral edge 112 of the heat radiating member 11, but is not limited thereto, and may be disposed in the center, for example. Further, the heat generating component is not limited to the configuration arranged on the flat surface, and may be arranged on a slope, for example. In this case, the fixed portion can be appropriately adjusted in shape and arrangement so that the heat generating component can be pressed against the heat radiating member.

  Furthermore, in the above-described embodiment, it has been described that the main body 15 functions as the support portion 18, but is not limited thereto. For example, the lid portion may function as a support portion that supports the fixing portion and is formed integrally with the fixing portion. In this case, the lid portion may be made of a resin material, and the fixed portion may be made of a resin molded body that is formed integrally with the lid portion. Alternatively, the fixing portion may be formed of a metal material that is insert-molded integrally with the lid portion.

  Moreover, although it demonstrated that the heat radiating member comprised the bottom part of an electronic device in the above-mentioned embodiment, the member which comprises a part of bottom part may be sufficient, for example, and a case may comprise a bottom part separately from a heat radiating member. You may have a member.

  Moreover, although it demonstrated that the electronic device of this invention was equipped with a heat-emitting component, it is not limited to this, You may provide the electronic component which does not have exothermic property. Moreover, the electronic device of this invention is not limited to the structure provided with a heat radiating member, The structure provided with the support body which supports an electronic component may be sufficient.

  Although the electronic device according to the present invention has been described as an ECU for electric power steering, the electronic device is not limited to this, and is an in-vehicle ECU or the like in an automobile engine control system, brake control system, suspension control system, or the like. May be.

DESCRIPTION OF SYMBOLS 10,20 ... Case 11,21 ... Heat dissipation member 112,212 ... Rim peripheral part 12,22 ... Heat-generating component 126 ... Screw hole (hole part)
DESCRIPTION OF SYMBOLS 13,23 ... Circuit board 15,25 ... Main body 151,251 ... Side wall part 152,252 ... Accommodating part 153 ... Connector 17,17 ... Fixed part 171,271 ... Connection part 172,272 ... End part 18,28 ... Supporting part 100, 200 ... Electronic equipment

Claims (8)

Heat-generating parts,
A heat dissipating member in which the heat generating component is disposed;
An electronic device comprising: a fixing part that presses and fixes the heat generating component against the heat radiating member; and a case assembled to the heat radiating member. The electronic device according to claim 1,
The case further includes a support portion that supports the fixed portion,
The fixing part is
A rod-shaped connecting portion extending from the support portion toward the heat generating member;
An electronic device having an end portion connected to the connecting portion and abutting against the heat generating component. The electronic device according to claim 2,
The fixing unit is an electronic device configured of a resin molded body formed integrally with the support unit. The electronic device according to claim 2,
The support portion is formed of a resin material,
The fixing portion is an electronic device formed of a metal material that is insert-molded integrally with the support portion. The electronic device according to any one of claims 2 to 4,
The heat generating component has a hole,
The end portion is an electronic device that engages with the hole. The electronic device according to any one of claims 1 to 5,
The heat generating component is disposed at a peripheral portion of the heat dissipation member,
The support part has a side wall part arranged at a peripheral part of the heat dissipation member,
The fixing part is an electronic device formed on the side wall part. The electronic device according to claim 6,
A circuit board electrically connected to the heat-generating component;
The case further includes an accommodating portion that is surrounded by the side wall portion and accommodates the circuit board, and a connector formed on the side wall portion. The electronic device according to any one of claims 1 to 7,
A plurality of heat generating components;
The case includes an electronic device including a plurality of fixing portions that correspond one-on-one to the plurality of heat generating components.

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