JP2003298255A - Electronic controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic controller having a structure for uniformizing pressures in a casing and the outside, and being capable of preventing water droplets and the like from being sucked into the casing. <P>SOLUTION: The electronic controller 1 comprises a casing R (a case 20 in detail) for accommodating a circuit board 10 on which electronic parts 11 are mounted, and a cover 30 assembled across an opening 21 in the case 20. A recess 24 is formed in a mounting surface 22 of the opening 21 across which the cover 30 is assembled. A breather hole 25 communicating a space Rs in the casing R with the outside is formed by assembling the cover 30 and the case 20 with the recess 24 put therebetween. In the electronic controller 1, an opening area of the breather hole 25 is spread from the space to the outside. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control device, and more particularly to a structure mounted on a vehicle or the like for equalizing pressure between an internal space of the electronic control device and an external environment.

[0002]

2. Description of the Related Art As an electronic control device, for example, in an electronic control device as a control device for an internal combustion engine for an automobile (hereinafter referred to as an engine), a circuit board is housed in a housing space formed by a case and a cover. Some have a structure for equalizing the pressure between the accommodation space and the external environment.

FIG. 9 is an exploded perspective view showing a part of the above conventional structure, and a circuit board (not shown) is housed in a housing space Rs (see FIG. 10) formed by a case 920 and a cover 930. As shown in FIGS. 9 and 10,
As a structure for equalizing the pressure between the accommodation space Rs of the electronic control device and the external environment, the case 9 in which the cover 930 is assembled is used.
The groove 924 is provided on the mounting surface 921 on the 20 side, and the case 9
By assembling 20 and the cover 930, a plurality of breathing holes 925 are formed. In addition, this breathing hole 925
Has a function of blocking some harmful substances such as dust from the external environment to some extent, the size of the groove 924 is
In many cases, it is formed in a required minimum small state.

[0004]

In the conventional structure, since the breathing hole 925 is formed simply by being sandwiched between the case 920 and the cover 930 facing each other, the breathing hole 925 is inserted into the housing space Rs of the housing through the breathing hole 922. Insufficient consideration is given to prevent the entry of water droplets that may enter. That is, for example, when the internal temperature of the housing formed of the case 920 and the cover 930 decreases due to a change in the outside air temperature or the like, if liquid such as water droplets f adheres to the vicinity of the breathing hole 925, the inside of the accommodation space Rs There is a concern that a water drop may be easily sucked into the housing through the breathing hole 925 due to the breathing action due to the contraction of the internal air.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a structure for equalizing the pressures inside and outside the housing of an electronic control device.
An object is to provide an electronic control device that can prevent water droplets and the like from being sucked into the housing.

[0006]

According to a first aspect of the present invention, there is provided a housing having an opening for housing a circuit board on which electronic components are mounted, and a lid assembled to the opening of the housing. A recess is formed in the mounting surface of the opening to which the lid is assembled, and the lid and the housing are assembled with the recess sandwiched therebetween to form a breathing hole that communicates the space inside the housing with the outside. In the device, the opening area of the breathing hole is expanded from the space to the outside.

Thus, by increasing the opening area of the breathing hole located in the vicinity of the water droplet with respect to the water droplet that may be sucked through the breathing hole, the so-called suction force of the breathing hole can be reduced, and therefore It is possible to make it difficult for the breathing hole to inhale water drops.

For example, as a method of expanding the opening area of the breathing hole from the space to the outside, the groove depth of the recess formed in the mounting surface can be increased from the space to the outside. As a result, the opening area of the breathing hole on the side of the space inside the housing can be maintained to be a small area that also has a function of blocking harmful substances such as dust from the external environment to some extent. It is possible to prevent water droplets from being sucked in.

According to the second aspect of the present invention, the shape of the depression is such that the groove depth on the side closer to the space is smaller and the groove depth on the side closer to the outside is larger.

With this, by reducing the groove depth of the depression near the space, the opening area of the breathing hole on the space side in the housing can be kept small, and a function of blocking harmful substances such as dust to some extent. It is possible to secure a predetermined small opening area that also has Further, by increasing the groove depth of the depression on the side closer to the outside, the opening area of the breathing hole located near the water droplet can be increased. Therefore, the suction force for sucking the water droplets into the housing can be reduced according to the increase in the opening area, so that the water droplets and the like can be prevented from entering the housing.

According to a third aspect of the present invention, there is provided a case having an opening for accommodating the circuit board on which the electronic component is mounted, and a lid assembled to the opening of the case, and the opening to which the lid is assembled. In the electronic control device in which a recess is formed on the mounting surface of the portion, and the breathing hole that connects the space inside the housing and the outside is formed by assembling the lid and the housing with the recess sandwiched, the mounting surface is , Is provided at a position separated by a predetermined length from the opening end of the opening.

Thus, the position of the breathing hole is provided at a position separated from the opening end of the opening, that is, the outer circumference of the housing by a predetermined length, so that, for example, the movement path to the water drop and the like adhering to the outer circumference of the housing and the breathing hole is long. However, it is possible to reduce the possibility of water droplets reaching the breathing holes.

As described in claim 6 of the present invention, it is desirable that the opening end of the opening, that is, the side where the opening of the housing is formed has a product mounting surface for mounting on a mounting object. . As a result, the position separated by the predetermined length means that the mounting surface is separated from the product mounting surface by a predetermined height, so that even if the suction force is not sufficiently small, for example, water droplets collected on the product mounting surface. In order to reach the breathing hole, a suction force that exceeds the potential energy of a predetermined height is required, so that it is possible to make it difficult for the breathing hole to suck in water droplets.

According to the fourth aspect of the present invention, the lid is formed in a convex shape having a convex portion on the central portion side with respect to the mounting surface, and the convex portion is assembled to the mounting surface.

Thus, as a method of separating the mounting surface according to claim 3 from the opening end of the opening by a predetermined length, the lid is provided with a convex portion, and the convex portion can be assembled to the mounting surface. A gap between the mounting surface and the opening end is required at least at the convex portion as compared with the flat plate lid, and thus the mounting surface can be reliably separated from the opening end.

Further, as a method of forming the breathing hole for expanding the opening area toward the outside according to the first aspect, the lid is formed so as to have a convex portion at the central portion side, so that the outer peripheral side of the lid is attached. The surface can be separated from the surface. Therefore, it is possible to dispose the outer peripheral side of the lid away from the mounting surface, that is, the recess, and the opening area of the breathing hole formed by the mounting surface and the lid is increased by sandwiching the recess by the distance from the recess. can do.

According to a fifth aspect of the present invention, a central portion of the lid is formed in a concave shape having a concave portion with respect to the mounting surface,
The outer peripheral edge of the central portion is attached to the attachment surface.

As a result, the possibility of water droplets reaching the breathing hole can be reduced by separating the mounting surface from the open end of the opening by a predetermined length as described in claim 3, and the recess having the recess in the center of the lid can be reduced. Since it is formed in a shape, the internal space of the housing, that is, the accommodation space for accommodating the circuit board can be reliably ensured.

According to the seventh aspect of the present invention, the mounting surface in contact with the breathing hole is provided with a groove extending in the vertical direction at a predetermined distance from the breathing hole.

As a result, water drops or the like are drawn to this groove,
Separation from the breather can reduce the likelihood that water droplets will be inhaled through the breather.

By forming the groove to have a small width, for example, water droplets can be efficiently attached to the groove by utilizing surface tension such as capillary phenomenon. Further, by arranging a plurality of these thin grooves, the amount of water droplets attached, that is, the amount of water droplets to be attracted can be increased, so that the possibility that the water droplets are sucked into the breathing hole can be further reduced.

According to the eighth aspect of the present invention, a groove extending in the vertical direction is provided on the side close to the outside of the depression.

As a result, the groove extending in the vertical direction is formed in the recessed portion on the side closer to the outside among the recesses formed in the mounting surface, so that, for example, the housing is molded by aluminum alloy or the like. When molding, it is possible to suppress an increase in manufacturing cost due to the addition of a groove extending in the vertical direction.

According to the ninth aspect of the present invention, the lid assembled to the mounting surface of the opening is formed in a convex shape having a projection on the side of the central portion corresponding to the opening.

With this, it is possible to collect the water droplets on the outer peripheral side of the convex portion located at a position lower than the convex portion.
In other words, by collecting the water droplets attached to the lid on the outer peripheral side of the central portion having the convex portion, the water droplets can be introduced into the breathing hole provided on the outer peripheral side. Therefore, even if water droplets are sucked in, the degree of discharge of water droplets to the outside again via the breathing hole can be improved.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an electronic control device of the present invention will be described.
An embodiment embodied by being applied to an electronic control device that is mounted on an internal combustion engine for an automobile (hereinafter, referred to as an engine) and controls an engine that is a drive device of a vehicle will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a partial sectional view showing a configuration of an electronic control device according to an embodiment of the present invention.
As shown in FIG. 1, the electronic control device 1 includes a circuit board 10 on which an electronic component 11 such as an IC or a semiconductor element is mounted, and a first housing member 20 that holds the circuit board 10 on which the electronic component 11 is mounted. And a second accommodating member 30 that accommodates the circuit board 10 in combination with the first accommodating member 20. The electronic control unit 1 is a control device that controls the engine and the like, and is a well-known fuel injection means (not shown) for injecting fuel to the engine according to the engine speed, load condition, etc. Well-known ignition means (not shown) for igniting the supplied fuel is PWM-controlled or P
The electronic component 11 mounted on the circuit board 10 for FM control or the like includes an electronic component having a heat generating property such as a semiconductor switching element. Here, the electronic control device 1 is not limited to a control device that controls an engine (hereinafter, referred to as an ECU), and may be a vehicle equipped with an engine,
It may be one that controls a rotating electric machine such as a generator, or one that controls an electric drive motor of an electric vehicle,
The electronic control device 1 may be attached to a mounting target such as an internal combustion engine or an electric drive motor, and may have any structure as long as it has a structure for equalizing the internal pressure of the electronic control device and the pressure of the external environment. In addition, the first housing member 20 and the second
The housing member 30 constitutes a housing R of the electronic control device 1.

The electronic control unit 1 described in this embodiment is an ECU for controlling the engine 100,
In the embodiment, it is assumed that the engine 100 is mounted around the engine 100, for example, in an engine block.

The first housing member (hereinafter referred to as a case) 20 and the second housing member (hereinafter referred to as a cover) 30 as the casing R of the electronic control unit 1 are each made of a metal material such as aluminum or aluminum alloy. The bottom surface of the case 20 is opened, and the cover 30 is formed so as to close the bottom opening (hereinafter referred to as opening) 21 of the case 20 (see FIG. 1). It is formed in a flat plate shape. The case 20 and the cover 30 are not limited to cast molding, but may be press molding or the like.

The members of the case 20 and the cover 30 that hold the circuit board 10 are not limited to those that fix the circuit board 10 to the inner peripheral surface 20a of the case 20 by adhesion or the like as shown in FIG. , The one that fixes the circuit board 10 to the inner peripheral surface 30a of the cover 30, especially the central portion 30a1 of the inner peripheral surface 30a by adhesion or the like, or the case 20 or the cover 3
It may be fixed to a boss (not shown) formed in 0, and may be arranged at substantially the center in the housing R.

In the following description of the present embodiment, the product mounting surface to be mounted on the engine block or the like as the mounting target 100 on which the housing R is mounted is formed at the opening end 23 of the opening 21 of the case 20, and Is set at the ceiling portion inside the housing R (specifically, the inner peripheral surface 20 of the case 20).
The description will be given assuming that they are arranged in a).

Circuit board (hereinafter referred to as a printed circuit board) 1
Reference numeral 0 is configured to include an electronic component 11 including a heat generating element such as a semiconductor switching element, and a substrate 12 on which the electronic component 11 is mounted. The substrate 12 is configured to include an insulating base material 12a and circuit wiring (not shown) arranged on the surface or inside of the insulating base material 12a, and the circuit wiring is electrically connected to the electronic component 11. ing.

The printed circuit board 10 is provided with a connector portion (not shown) which is an external connection portion so as to operate the electronic component 11 via the circuit wiring. Specifically, in the printed circuit board 10, the electronic component 11 is mounted on the circuit wiring, and the circuit wiring and the connector portion are electrically connected to each other. Through the connector portion and the circuit wiring, an external signal output or the like to the electronic component 11 is performed. Electrical signals are being input / output.

The connector portion as the external connection portion is not limited to the structure arranged to extend in a direction substantially orthogonal to the engine block as the mounting target 100 shown in FIG. May be provided in the engine block 100 so as to extend substantially parallel to the engine block 100 (specifically, in the left-right direction in FIG. 1).

The case 20 and the cover 30 are combined and fixed with screws (not shown) or the like, and the circuit board 1
A case R that accommodates 0 is formed. Case 2
The configuration for fixing the 0 and the cover 30 in combination is not limited to the configuration in which they are screwed and fixed by a screw or the like, and for example, the case 20
It may be configured such that an assembling hole (not shown) provided on the cover and a protrusion (not shown) provided on the cover 30 are fitted and fixed, or that they are fixed by adhesion. The base 20 and the cover 30 described in the present embodiment will be described below as being screwed and fixed.

Here, with respect to the structure which is characteristic of the present invention, is provided with a structure for equalizing the pressure between the inside of the housing R and the external environment, and preventing the water droplets and the like from being sucked into the inside of the housing R,
This will be described below.

A cover 30 is provided in the opening 21 of the case 20.
Is formed on the mounting surface 22. The mounting surface 22 has a recess 24 as shown in FIG. Accordingly, when the case 20 and the cover 30 are assembled to form the housing R, the recess 24 (specifically, the recess 2
4 inner peripheral surface 24a) and the cover 30 (specifically, the inner peripheral surface 3).
A breathing hole 25 surrounded by 0a) is formed. The breathing hole 25 connects a space (hereinafter, referred to as a housing space of the circuit board 10) Rs defined by the inner peripheral surfaces 20a and 30a in the housing R and an external environment, and the housing space R and the external environment ( Hereinafter, it will be referred to as “outside”).

Further, in this embodiment, the shape of the depression 24 as the breathing hole 25 (specifically, the shape of the inner peripheral surface 24a).
Is formed so that the groove depth h1 of the recessed portion 24a1 on the side closer to the accommodation space Rs is smaller, and the recessed portion 24a2 on the side closer to the outside is formed.
The groove depth h2 is formed to be large (groove depth h1 <h2).

As a result, the opening area of the breathing hole 25 can be expanded outward from the accommodation space Rs.
That is, by increasing the opening area of the breathing hole located in the vicinity of the water droplet f with respect to the water droplet f that may be sucked through the breathing hole 25, the suction force of the breathing hole 25 can be reduced, and thus the breathing can be performed. The holes can make it difficult for water droplets to be sucked in (see FIG. 1).

The suction force means the operating state of the engine 100 in which the electronic control unit 1 is mounted or the engine 100.
When the temperature of the housing R (specifically, the accommodation space Rs) decreases due to a change in the environment in which the housing R is left, for example, a change in the outside temperature, the interior partitioned into the space Rs due to the decrease in the accommodation space Rs. Respiratory action caused by the contraction of air. The suction force due to the breathing action is dispersed because the opening area is enlarged, and on the side of the breathing hole 25 near the outside, because the opening area is enlarged, the suction force can be attenuated. .

As a method for expanding the opening area of the breathing hole 25 from the accommodation space Rs to the outside, the groove depths h1 and h2 of the depression 24 as shown in FIG. 1 are changed in two steps. The groove depth of the depression 24 is not limited to the accommodation space R
A configuration in which the taper is inclined from s toward the outside may be used. In this case, it is possible to maintain the opening area of the breathing hole 25 on the accommodation space Rs side to a small area that can block harmful substances such as external dust to some extent, and the opening area of the breathing hole 25 on the outside side. By enlarging, it is possible to prevent water droplets f and the like from being sucked into the housing R (specifically, the accommodation space Rs).

Here, since the depression 24 of this embodiment has a configuration in which the groove depths h1 and h2 are changed in two steps, the opening area that can shield harmful substances such as external dust to some extent is set to the groove depth. It can be reliably ensured within the hole length range of the breathing hole corresponding to h1.

As described above, in the present embodiment, the shape of the recess 24 is changed as a method of expanding the opening area of the breathing hole 25 from the accommodation space Rs to the outside.
The configuration may be changed.

For example, by forming the lid 30 to have a convex portion on the central portion side, the outer peripheral side of the lid 30 is attached to the mounting surface 22 due to the convex lid 30 having the convex portion on the central portion side.
That is, it is possible to dispose it away from the recess 24. Therefore, the opening area of the breathing hole 25 (in particular, the opening area of the breathing hole 25 on the outer side) can be increased. At this time, it is not necessary to form the entire outer peripheral side of the lid 30 away from the mounting surface 22, and the inner peripheral surface 30a of the lid 30 may be formed.
Of these, the shape may be separated from the recess 24 only around the inner peripheral surface 30a forming the inner periphery of the breathing hole 25.

(Second Embodiment) In the second embodiment, as the position of the breathing hole 25 described in the first embodiment, as shown in FIG. It is provided at a position separated from the end 23 by a predetermined length. FIG. 2 is a partial cross-sectional view showing the configuration of the electronic control device according to the embodiment of the present invention.

As a result, the position of the breathing hole 25 is set to the open end 2
3 That is, since it is provided at a position apart from the outer periphery of the casing R by a predetermined length, the movement path between the water droplet f and the like attached to the outer periphery of the casing R and the breathing hole 25 is lengthened, and the water droplet f may reach the breathing hole 25. Can be made smaller.

Further, in this embodiment, since the opening end 23 is the product mounting surface, the mounting surface 22 is separated from the product mounting surface 23 by a predetermined height from the position separated by the predetermined length. Therefore, even if the suction force is not sufficiently small, as shown in FIG. 2, in order that the water droplets f accumulated on the product mounting surface 23 reach the breathing hole 25,
Since the suction force that exceeds the potential energy for the predetermined height is required, it is possible to make it difficult for the breathing hole 25 to suck the water droplet f.

(Third Embodiment) In the third embodiment, as a means for changing the position of the breathing hole 25 described in the second embodiment, as shown in FIG. 3, the shape of the lid 30 is changed. May be FIG. 3 is a partial cross-sectional view showing the configuration of the electronic control device according to the embodiment of the present invention.

As shown in FIG. 3, the lid 30 has a mounting surface 2
2 is formed in a convex shape having a convex portion 31 on the center side, and the convex portion 31 is assembled to the mounting surface 22.

As a result, the lid 30 is provided with the convex portion 31 as a means for separating the position of the mounting surface 22, that is, the breathing hole 25 from the opening end 23 which is the product mounting surface by a predetermined length, and the convex portion 31 makes the mounting surface 22 on the mounting surface 22. Since they are assembled, a gap between the mounting surface 22 and the product mounting surface 23 is required by at least the convex portion 31 compared to a flat plate lid, and therefore the mounting surface 22 can be reliably separated from the product mounting surface 23. it can.

Further, as shown in FIG. 3, due to the convex lid 30 having the convex portion on the center side, the outer peripheral side of the lid 30 is arranged so as to be separated from the mounting surface 22, that is, the recess 24.

As a result, the opening area of the breathing hole 25 (in particular, the opening area of the breathing hole 25 on the outside) can be increased. That is, in addition to expanding the opening area of the breathing hole 25 by the groove depths h1 and h2 of the depression 24, the opening area can be further expanded by the distance Δh2 away from the mounting surface 22 on the outer peripheral side 30a1 of the lid 30.

(First Modification) As a first modification,
In the lid 30 described in the third embodiment, as shown in FIG. 4, the central portion may have a recess 32 with respect to the mounting surface 22. FIG. 4 is a partial cross-sectional view showing the configuration of the electronic control device of this modification.

As a result, the possibility of the water droplet f reaching the breathing hole 25 can be reduced by the means for changing the position of the breathing hole 25 described in the third embodiment, and the recess 32 is formed in the central portion of the lid 30. Thus, the internal space of the housing R, that is, the accommodation space Rs for accommodating the circuit board 10 can be reliably ensured.

(Fourth Embodiment) As a fourth embodiment, the recess 24 formed in the mounting surface 22 described in the first embodiment is close to the outside of the recess 24 as shown in FIG. A groove 26 that extends vertically (hereinafter referred to as a vertical groove) 26 is provided on the side 24ao. FIG. 5 is a partial cross-sectional view showing the configuration of the electronic control device according to the embodiment of the present invention. Note that FIG. 6 shows the opening 21 of the casing R shown in FIG.
In particular, it is a perspective sectional view showing the periphery of the mounting surface 22.

As shown in FIG. 5, a vertical groove 26 is provided on the mounting surface 22 which is in contact with the breathing hole 25 and is separated from the breathing hole 25 by a predetermined distance L26. The predetermined distance L26 of the vertical groove 26 is greater than the predetermined distance L25 from the breathing hole 25 of the depression 24 (L26> L24).

As a result, the water droplet f or the like is drawn to the groove 26 and separated from the breathing hole 25, so that the water droplet f is made into the breathing hole 25.
Can reduce the chance of being sucked through.

Further, in this embodiment, the vertical groove 26
As shown in FIGS. 5 and 6, among the recesses 24 formed in the mounting surface 22, the recesses 24a on the side closer to the outside are formed, so that the case 20 is molded with an aluminum alloy or the like. In the case of molding by, it is possible to suppress an increase in manufacturing cost due to the addition of the vertical groove 26 extending in the vertical direction.

As the vertical groove 26 described in the present embodiment, the width W26 of the groove 26 is formed to be small,
Water droplets can be efficiently attached to the grooves 26 by utilizing surface tension such as a capillary phenomenon. Therefore, the vertical groove 26
By efficiently adhering the water droplet f to the recess 24, it is possible to make it difficult for the water droplet f to adhere to the depression 24.

Furthermore, by arranging a plurality of the thin grooves 26 (see FIG. 6), it is possible to increase the attachment amount of the water droplet f, that is, the amount of the water droplet f to be attracted, so that the water droplet f is sucked into the breathing hole 25. It is possible to further reduce the possibility of being affected.

(Fifth Embodiment) As the fifth embodiment, in the lid 30 described in the first embodiment, as shown in FIG. 7, the opening 21 is provided on the central side of the lid 30. Thus, the convex portion (hereinafter, second convex portion) 33 is provided. FIG. 7 is a partial cross-sectional view showing the configuration of the electronic control device of this embodiment.

As shown in FIG. 7, the lid 30 is attached to the mounting surface 22.
Is attached to the central portion of the lid 30,
A second convex portion 33 corresponding to the opening 21 (specifically, insertable into the accommodation space Rs corresponding to the shape of the opening 21) is provided.

As a result, it is possible to collect the water droplets f on the outer peripheral side of the lid 30 located at a position lower than the second convex portion 33. In other words, the water droplet f attached to the lid 33
Can be introduced into the breathing hole 25 provided on the outer peripheral side instead of the central portion having the second convex portion (see FIG. 7) (the water droplets f are collected on the outer peripheral side of the lid 30). Means). Therefore, even if the water droplet f is sucked into the housing R, that is, the housing space Rs, the degree of discharge of the water droplet f to the outside through the breathing hole 25 can be improved.

(Second Modification) As a second modification,
In the lid 30 described in the fifth embodiment, as shown in FIG. 8, of the second protrusions 33 that can be inserted into the accommodation space Rs corresponding to the shape of the opening 21, on the center side, A configuration is provided in which a recess (second recess) 34 is provided.

As a result, by the means for collecting the water droplets f on the outer peripheral side of the lid 30 described in the fifth embodiment, the discharge degree of discharging the water droplets f to the outside through the breathing hole 25 can be improved, and at the same time, A second recess 34 is formed in the center of the lid 30.
Since the space is formed, the accommodation space Rs can be reliably ensured.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing the configuration of an electronic control device according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a configuration of an electronic control device according to a second embodiment.

FIG. 3 is a partial cross-sectional view showing a configuration of an electronic control device of a third modified example.

FIG. 4 is a partial cross-sectional view showing a configuration of an electronic control device of a first modified example.

FIG. 5 is a partial cross-sectional view showing the configuration of an electronic control device according to a fourth embodiment.

6 is a perspective cross-sectional view showing an opening of the housing shown in FIG. 5, particularly around the mounting surface.

FIG. 7 is a partial cross-sectional view showing a configuration of an electronic control device of a fifth embodiment.

FIG. 8 is a partial cross-sectional view showing a configuration of an electronic control device of a second modified example.

FIG. 9 is an exploded perspective view showing a part of the structure of a conventional electronic control device.

10 is a partial cross-sectional view showing the conventional configuration shown in FIG.

[Explanation of symbols]

1 Electronic control equipment 10 circuit board 11 electronic components 12 substrates 20 cases (first housing member) 20a inner peripheral surface 21 Opening (bottom opening) 22 Mounting surface 23 Open end (product mounting surface) 24 hollow 24a inner peripheral surface 25 breathing holes 26 Vertically extending groove (vertical groove) 30 cover (second containing member) 30a inner peripheral surface 31 convex 32 recess 33 convex part (second convex part) 34 recess (second recess) 100 Internal combustion engine (engine block) R housing Rs space (accommodation space)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Keiichi Kato             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F-term (reference) 4E360 AB12 CA02 EA03 EA27 EB03                       ED02 ED03 ED07 GA22 GA29                       GA60 GB97 GC04

Claims (9)

[Claims] 1. A mounting method, comprising: a housing having an opening for accommodating a circuit board on which an electronic component is mounted; and a lid attached to the opening of the housing, the opening being attached to the lid. In the electronic control device, a recess is formed on the surface, and a breathing hole that connects the space inside the housing and the outside is formed by assembling the lid and the housing with the recess sandwiched therebetween. The opening area of is expanded from the space toward the outside, the electronic control device. 2. The electron according to claim 1, wherein the shape of the recess is formed such that the groove depth on the side closer to the space is smaller and the groove depth on the side closer to the outside is larger. Control equipment. 3. A housing having an opening for accommodating a circuit board on which an electronic component is mounted, and a lid assembled to the opening of the housing, wherein the opening is attached to the lid. In the electronic control device, a recess is formed in a surface, and a breathing hole that connects the space inside the housing and the outside is formed by assembling the lid and the housing with the recess sandwiched therebetween. Is provided at a position separated by a predetermined length from the opening end of the opening. 4. The lid is formed in a convex shape having a convex portion on a central portion side with respect to the mounting surface, and the convex portion is assembled to the mounting surface. The electronic control device according to any one of claims 1 to 3. 5. The central portion of the lid is formed in a concave shape having a concave portion with respect to the mounting surface, and an outer peripheral edge portion of the central portion is mounted on the mounting surface. The electronic control device according to any one of claims 1 to 4. 6. The product mounting surface for mounting on a mounting object is provided on a side of the housing on which the opening is formed, according to claim 1. Electronic control equipment. 7. The mounting surface in contact with the breathing hole is provided with a groove extending in a vertical direction at a predetermined distance from the breathing hole. The electronic control device according to item. 8. The electronic control device according to claim 7, wherein the groove extending in the vertical direction is provided on a side of the recess that is closer to the outside. 9. The lid, which is assembled to the mounting surface of the opening, is formed in a convex shape having a projection on the center side corresponding to the opening.
9. The electronic control device according to any one of claims 3 to 6 and claim 8.