JP6346048B2 - Electronic control unit - Google Patents

Description

  The present invention relates to an electronic control device for a vehicle in which a circuit board is housed in a waterproof space inside a housing.

  Electronic control devices mounted on a vehicle such as a general engine control unit or a control unit for an automatic transmission are provided in a protective space (waterproof space) formed by joining a plurality of casing members. The circuit board on which various electronic components are mounted is accommodated.

  Such an electronic control device is mounted in a vehicle engine room or the like, and thus requires high waterproofness. However, if the inside of the housing is a completely sealed space, the pressure inside the housing increases and decreases. There is a possibility that excessive stress is generated in the casing and its seal portion, resulting in a decrease in durability and reliability.

  Therefore, a housing having a so-called breathing filter function has been studied. For example, as shown in Patent Document 1, a housing through-hole penetrating in the thickness direction of the housing member and an outer opening of the housing through-hole are disclosed. A protective wall (a filter cover in Patent Document 1) that covers the portion with the outer opening provided with a ventilation gap, and penetrates the protective wall in the thickness direction of the protective wall (for example, the housing through hole A configuration including a protective wall through-hole that penetrates in the radial direction and communicates with the ventilation gap, and a breathable and waterproof breathable waterproof film attached to the inner opening of the housing through-hole.

JP 2006-5162 A

  However, in the case of the configuration in which the housing through hole that penetrates in the thickness direction of the housing member is simply formed and the outer opening of the housing through hole is covered with the protective wall as described above, the protective wall The outer peripheral side has a protruding shape, and is easily damaged when the electronic control device is handled (for example, when transported or attached to a vehicle), and the electronic control device is increased in size.

  The present invention has been made in view of such circumstances, and provides an electronic control device capable of suppressing the protrusion of the casing to the outer peripheral side and obtaining air permeability and waterproofness inside the casing. There is.

  The electronic control device according to the present invention is a creation that can solve the above-described problems. One aspect of the electronic control device is a circuit board on which electronic components are mounted in an internal space of a casing formed by joining a plurality of casing members. In the electronic control device, at least one of the casing members is a plurality of outer wall surfaces that are spaced apart from each other on a peripheral side of the outer wall surface in the thick part of the casing member A thick part through-hole having an opening and formed between each outer wall opening, and a communication hole communicating between the inner wall of the thick part and the thick part through-hole; And a breathable and waterproof breathable waterproof film attached to the opening inside the housing of the communication hole.

  As described above, according to the present invention, it is possible to suppress the protrusion of the casing to the outer peripheral side, and to obtain air permeability and waterproofness inside the casing.

The schematic perspective view which shows an example of the electronic controller in this embodiment (the exploded perspective view which faced from the cover 3 side). 1 is a schematic cross-sectional view (an exploded perspective view from the case 2 side) illustrating an example of an electronic control device according to the present embodiment. Schematic of the electronic control unit 10 (top view after joining the case 2, the cover 3, etc.). FIG. 4 is a schematic cross-sectional view of the electronic control device 10 (cross-sectional view taken along line XX in FIG. 3). FIG. 5 is a partially enlarged view of FIG. 4 (enlarged view of a surrounding line 4A of FIG. 4). The schematic perspective view of the cover 3 provided with the ventilation waterproof membrane 7 (the perspective view which faced the ventilation waterproof membrane 7). The schematic sectional drawing of the cover 3 (YY sectional view taken on the line of FIG. 6). FIG. 7 is a schematic sectional view of the cover 3 (a sectional view taken along the line ZZ in FIG. 6). Schematic which shows an example of the mounting attitude | position of the electronic control apparatus. FIG. 7 is a schematic cross-sectional view showing a modification of the corner portion 30 of the electronic control device 10 (a view corresponding to a cross section taken along the line ZZ in FIG. 6). FIG. 7 is a schematic cross-sectional view showing a modification of the corner portion 30 of the electronic control device 10 (a view corresponding to a cross section taken along the line ZZ in FIG. 6). FIG. 6 is a schematic perspective view (partial cross-sectional view) showing a modification of the electronic control device 10. FIG. 13 is a partially enlarged view of FIG. 12 (enlarged view of a surrounding line 12A of FIG. 12).

  An electronic control device according to an embodiment of the present invention has a configuration in which, for example, a housing through hole that penetrates in the thickness direction of a housing member is simply formed as in the prior art, and an outer opening of the housing through hole is covered with a protective wall. And has a plurality of outer wall surface openings spaced from each other on the peripheral edge side of the outer wall surface in the thick part of the casing member, and between the outer wall surface openings. A thick part through-hole formed through, a communication hole communicating between the inner wall surface of the thick part and the thick part through-hole, and an opening inside the housing of the communication hole are attached. A breathable and waterproof breathable waterproof membrane, and a vent passage between the outer wall surface opening and the breathable waterproof membrane (a configuration having a so-called breathing filter function).

  According to the present embodiment, the thick air through hole, the communication hole, etc. are formed in the thick part of the casing member (formed so as to be embedded in the thick part of the casing member). Since the passage is provided, it is not necessary to provide a protective wall as in the prior art, and it is possible to suppress the protrusion of the casing to the outer peripheral side and to obtain the air permeability and waterproofness inside the casing.

  As described above, the electronic control device according to the present embodiment has a configuration in which the thick portion through-hole, the communication hole, and the like are formed in the thick portion of the casing member as described above. A known technique can be applied as appropriate to change to various forms, and each of them can have useful effects.

  For example, the casing member may have a shape having a thick portion capable of forming the thick portion through hole or the communication hole as described above, and various shapes can be applied. The shape of the portion (for example, the thickness dimension) and the formation position can be variously set. A specific example thereof is a housing member having adjacent outer wall surfaces inclined at different angles, and can be formed with thick-wall through holes and communication holes in the thick wall portions between the respective outer wall surfaces. A casing member (for example, a cover 3 to be described later) capable of forming a plurality of outer wall surface openings at a distance from each other is provided on the peripheral edge side of the outer wall surface in the thick portion. The thick part through hole and the communication hole can be applied in various forms as long as they have a waterproof and breathable shape inside the housing.

  For example, in the case of a thick part through hole, it may be formed through a plurality of (two in the configuration example described later) outer wall surface openings formed on the peripheral side of the outer wall surface in the thick part. What is necessary is just to set the shape (for example, cross-sectional shape, penetration direction dimension) etc. of the said thick part through-hole variously. For example, in the case of the above-described specific example of the housing member, a shape extending so as to penetrate linearly between the outer wall surface openings can be mentioned, but in addition to the linear shape, a curved shape or a meandering shape can be mentioned. It may have an extended shape. The outer wall surface opening may have any shape that can be formed on the peripheral side of the outer wall surface in the thick portion, and examples thereof include a perfect circle, an ellipse, and a polygon, but are not particularly limited.

  In the case of the communication hole, the inner wall surface of the thick portion and the through hole of the thick portion are communicated, and the ventilation waterproof film provided in the opening inside the housing in the communication hole and the opening portion of the outer wall surface. The shape of the communication hole (for example, the cross-sectional shape, the dimension in the communication direction) and the like can be set variously. For example, in the case of the above-described specific example of the casing member, a shape extending so as to communicate linearly between the inner wall surface of the thick portion and the thick portion through-hole can be mentioned. In addition, the shape may extend in a curved shape or a meandering shape.

≪Example of electronic control unit configuration≫
Hereinafter, an example in which the electronic control device according to the present embodiment is applied to an engine control unit of an automobile will be described in detail based on the drawings. First, with reference to FIGS. 1 to 5 in particular, the electronic control device 10 in which the circuit board 4 is accommodated in a space inside the casing 1 formed by joining a plurality of casing members (case 2, cover 3 and the like described later). The basic configuration will be described. In the description here, for the sake of convenience, the vertical direction of FIG. 1, that is, the thickness direction of the circuit board 4 may be described as the vertical direction of the device 10 itself. For example, when the mounted state is the vertical posture, the vertical direction of the device 10 in FIG. 4 is along the front-rear direction and the left-right direction of the vehicle.

  The electronic control device 10 includes a case 1 formed by liquid-tightly bonding a substantially plate-like case 2 and a substantially box-shaped cover 3 attached to a vehicle body side (not shown) (joined via a seal material 1a described later). The circuit board 4 is housed in a protective space inside the housing 1 and mounted with various electronic components. The circuit board 4 is mounted in the engine room of the vehicle body and serves as a mounting surface for the vehicle body. The bottom surfaces (lower side surfaces) 2d of the brackets 2a and 2b are attached to the vehicle body side. The mounting surface (bottom surface 2d) on the vehicle body side is configured in parallel with the back surface 21b of the bottom wall 21 of the case 2 in this embodiment, but the shape of the mounting portions (brackets 2a and 2b) on the vehicle body side is used. In some cases, the inclination may be inclined with respect to the back surface 21b.

  Specifically, each component will be described. The circuit board 4 has a non-heat-generating component that does not generate heat relatively on its upper side surface (the surface on the cover 3 side) 4a or does not require special heat-dissipation treatment such as a heat sink. 41a (for example, a capacitor, a coil, etc.) 41a and a heat-generating component (for example, an arithmetic processing unit, a transistor, an IC, etc.) 41b that is more likely to generate heat than the non-heat-generating component 41a and that preferably performs heat dissipation, for example, are mounted. A so-called printed wiring board, for example, a wiring circuit pattern (not shown) is formed on the front and back surfaces of a plate material made of glass epoxy resin or the like, and a non-heat generating component 41a and a heat generating component 41b are formed on the wiring circuit pattern. Each is electrically connected by solder or the like. For example, in the case of the circuit board 4 shown in the figure, the heat generating component 41b is also mounted on the lower side surface (surface on the case 2 side) 4b.

  Further, a connector 42 having a connection port 42 a connected to an external connector is attached to a part of the peripheral side of the circuit board 4. The connector 42 is fixed to the circuit board 4 via the mounting base 42 b (for example, fixed by a plurality of screws), and a connection port 42 a connected by the mounting base 42 b is formed between the case 2 and the cover 3. It faces the outside through a window 43 that is a space to be connected to a connector on the vehicle side. The connector 42 is provided with a plurality of male terminals 42c electrically connected to the wiring circuit pattern on the circuit board 4, and the male terminals 42c are accommodated in a plurality of female terminals accommodated in a connector not shown. By being connected to the mold terminal, it is electrically connected to a predetermined device such as a sensor or a pump connected to a connector (female terminal) outside the figure.

  The case 2 is made of, for example, a metal material having excellent thermal conductivity such as aluminum, and is integrally formed in a substantially plate shape having a predetermined thickness, more specifically, a shallow box shape in which the periphery slightly rises. Is. Specifically, the side wall 22 is erected on the outer peripheral edge (each side) of the substantially rectangular bottom wall 21, and the whole is configured to open upward. Cover fixing portions 23 for attaching and fixing the cover 3 are formed at the four corners of the side wall 22, and each of these cover fixing portions 23 is provided with a through hole 23a penetrating in the vertical direction.

  The circuit board 4 is mounted and fixed via a board mounting portion 20 erected on the peripheral edge of the bottom wall 21 of the case 2 on the inner wall surface 21a side. The board mounting portion 20 has a flat support surface 20a for supporting the circuit board 4 at its upper end, and the female screw holes 20b formed in the support faces 20a are inserted into the periphery of the circuit board 4. A screw 44 that passes through the through hole 44a on the edge side and serves for fixation is screwed. Thus, the screw 44 is screwed into each female screw hole 20 b, whereby the circuit board 4 is fixed to the case 2 while being supported by each board mounting portion 20. In the board mounting portion 20, a guide pin 20c is erected from the board mounting portion 20 (in the figure, erected from two board mounting portions 20), and the guide pin 20c is opposed to the erected position. The circuit board 4 can be guided to a predetermined position (by being guided so that the screw 44 can be screwed into each female screw hole 20b) by being able to pass through the positioning hole 44b formed on the peripheral edge side of 4. It becomes possible.

  On the inner wall surface 21 a side of the bottom wall 21 of the case 2, a heat radiating portion 24 is formed at a position facing the mounting position of the heat-generating component 41 b of the circuit board 4, and the circuit board 4 ( And a shape protruding so as not to interfere with the exothermic component 41b). The heat radiating portion 24 can absorb, for example, heat generated from the heat-generating component 41b, and contributes to radiating the heat to the outside of the housing 1 (for example, radiating through the bottom wall 21).

  A pair of brackets 2 a and 2 b for integrally mounting the electronic control device 10 to a vehicle body (not shown) are integrally provided on the outer side portion of the side wall 22 in the case 2. These brackets 2a and 2b are respectively provided with a notch groove 2aa that opens to the side and a through-hole 2bb that penetrates in the vertical direction, and a bolt or the like that is inserted through the notch groove 2aa and the through-hole 2bb. Installation on the vehicle body side is performed. Furthermore, as shown in FIG. 5, a plurality of strip-shaped heat radiation fins 21 bb are provided in parallel at predetermined intervals on the back surface 21 b side of the bottom wall 21 in the case 2.

The cover 3 is integrally formed in a substantially box shape using a predetermined synthetic resin material, which is lighter and lower in cost than a metal material, for example, and includes an upper wall portion 31 that covers the circuit board 4 and the connector 42 and the upper wall portion 31. And a side wall portion 32 that surrounds the three sides of the peripheral edge of the upper wall portion 31 excluding the window portion 43 , and has a shape having a predetermined thickness. Positioning projections 3a having a shape penetrating through the through holes 23a of the cover fixing portion 23 are formed at positions facing the cover fixing portion 23 of the case 2 in the side wall portion 32, and the positioning protrusions 3a are respectively inserted into the through holes. The cover 3 is supported on each cover fixing portion 23 by passing the tip end side of each positioning projection 3a protruding through each through hole 23a (projecting toward the bottom wall 21) and caulking (thermal caulking). In this state, it can be fixed to the case 2.

  A joint portion between the upper peripheral portion of the case 2 and the lower peripheral portion of the cover 3, a joint portion between the upper peripheral portion of the case 2 and the lower peripheral portion of the connector 42, and the outer peripheral portion of the connector 42 Each of the joint portions of the window 43 with the inner peripheral edge is liquid-tight via a sealing material 1a (the shape after the liquid sealing material is cured in FIGS. 1 and 2) in order to ensure waterproofness. It is joined. These joint portions can be sealed by various seal structures. For example, in the joint portion between the upper peripheral edge portion of the case 2 and the lower peripheral edge portion of the cover 3, a seal groove 1b is formed in one of them. The length of the sealing material filled in the gap between the seal groove 1b and the protrusion 1c is formed by providing the protrusion 1c on the other side and inserting the protrusion 1c into the seal groove 1b with a gap. The so-called seal length is sufficiently secured, and a desired sealing property can be obtained. Examples of the sealing material 1a include a liquid sealing material having fluidity that can be poured into the sealing groove 1b. Specific examples of the sealing material 1a include an epoxy type, a silicone type, an acrylic type, and the like according to the specifications and requirements of the electronic control device 10. However, it is not particularly limited.

  As described above, in the device 10 in which the circuit board 4 is accommodated in the protective space inside the housing 1 that joins the case 2 and the cover 3, a connector 42 that opens to the side is attached to one end of the circuit board 4. It becomes a structure. In this relationship, the cover 3 of the housing 1 has a stepped shape corresponding to each of the circuit board 4 and the connector 42 having different dimensions (heights) in the thickness direction of the circuit board 4. Specifically, an upper step portion 31 a and a lower step portion 31 b parallel to the bottom surface 2 d of the case 2 are provided on the upper wall portion 31 of the cover 3 that faces the case 2 with the circuit board 4 and the connector 42 interposed therebetween. . The upper step portion 31 a covering the upper portion of the connector 42 is set to have a larger dimension in the thickness direction of the circuit board 4 than the lower step portion 31 b covering the upper portion of the circuit board 4. And the inclined wall part 31c which connects smoothly the upper step part 31a and lower step part 31b from which height differs in this way is provided. The inclined wall portion 31c is flatly inclined at a predetermined inclination angle (for example, an inclination angle of about 45 degrees) with respect to the bottom surface 2d of the case 2, and therefore, the same applies to the upper step portion 31a and the lower step portion 31b. It is inclined at an inclination angle.

  Further, the casing 1 as described above has a plurality of outer wall surfaces inclined at various angles, for example, the outer wall surface 33 of the lower step portion 31b of the upper wall portion 31 and the outer wall surfaces 34a and 34b of the side wall portion 32. , 34c (hereinafter collectively referred to as the outer wall surface 34), the shape extends in a direction intersecting each other. Further, corner portions 35 and corner portions 30 and 30 a are formed between the outer wall surface 33 and the outer wall surface 34 in the housing 1.

  In the corner portion 30 located between the outer wall surfaces 34a and 34b, the thick portion through-hole 5 (described later in detail) that passes through between the outer wall surface openings 36a and 36b formed in the outer wall surfaces 34a and 34b. ) And a communicating hole 6 (which will be described in detail later) that communicates between the thick part through hole 5 and the inner wall surface 37 of the corner part 30 (the thick part through hole 5 communicates with the inside of the housing 1). The breathable and waterproof breathable waterproof film 7 attached to the inner opening 6a on the inside of the housing 1 of the communication hole 6 has a breathing filter function.

  The breathable waterproof membrane 7 can be appropriately applied as long as it has both waterproofness and breathability. For example, a thin-film nonwoven fabric member such as Gore-Tex (registered trademark) may be used. Instead of simply applying a shape that can cover the inner opening 6 a of the communication hole 6, the board mounting portion 20 (for example, a screw) at a position facing the ventilation waterproof film 7 (and the corner portion 30) in the circuit board 4. 44) and a shape that does not interfere with the shape (disc shape in the figure). For example, by appropriately designing the shape of the housing so that a sufficient gap can be formed between the breathable waterproof membrane 7 (and the corner portion 30) and the board mounting portion 20, the two are prevented from interfering with each other. it can.

  Further, by forming a C-shaped guide 37a extending along the opening edge surface of the inner opening 6a and having a diameter larger than that of the ventilation waterproof film 7, the ventilation waterproof film 7 is predetermined. While being able to attach while guiding to a position (position which can cover the inner side opening part 6a), the position shift of the said ventilation waterproofing membrane 7 can be suppressed. Furthermore, the inner wall surface 37 has a shape that is flatly inclined with respect to the bottom surface 2d of the case 2 at a predetermined inclination angle (for example, an inclination angle of about 45 degrees).

≪Example of configuring respiratory filter function≫
Hereinafter, in the electronic control device 10, an example of the configuration of the respiratory filter function by the corner portion 30 having the thick portion through hole 5, the communication hole 6, and the ventilation waterproof film 7 will be described. 1 and 2 are given the same reference numerals, and the detailed description thereof is omitted.

  The corner portion 30 shown in FIG. 6 to FIG. 8 has a conical shape (conical shape with a trapezoidal bottom surface (inner wall surface 37) in the drawings) and a shape having a desired thickness, and the corner portion 30 30, a thick-walled through-hole 5 having a trapezoidal cross-sectional shape passes linearly between the outer wall surface openings 36 a and 36 b formed in the outer wall surfaces 34 a and 34 b of the cover 3. The inner wall surface 37 is formed so as to extend in the same direction.

  Between the central part of the thick part through hole 5 and the central part of the inner wall surface 37, a communication hole 6 having a circular cross section is provided between the thick part through hole 5 and the inner wall surface 37. The thick part through hole 5 extends in a direction that intersects with the thick part through hole 5 and the inner wall surface 37 and communicates with the thick part through hole 5 with the inside of the housing 1.

  With the configuration in which the thick part through-hole 5 and the communication hole 6 intersect each other as described above, the ventilation passage 50 is formed between the outer wall surface openings 36a and 36b and the inner opening 6a of the communication hole 6, A bent portion 51 is formed at the center of the ventilation passage 50. Thus, the wall surface of the ventilation passage 50 having the bent portion 51 (for example, the surface near the bent portion 51), for example, the inner wall surface 52 of the thick portion through hole 5 and the hole of the communication hole 6 as shown in FIG. The inner wall surface 61 (and the opening edge surface of the outer opening 6b, etc.) functions as a barrier. For example, the intruding water S (high-pressure water or the like) that linearly enters from the outside of the housing 1 into the ventilation passage 50 It becomes easy to collide with the barrier (details will be described later).

  Here, paying attention to a general mounting posture of the electronic control device 10 with respect to the vehicle body, in many cases, for example, as shown in FIG. 4, the circuit board 4 is in a substantially horizontal direction (for example, a direction intersecting the vertical direction in the figure). ), That is, the horizontal position in which the bottom surface 2d serving as the mounting surface with respect to the vehicle body extends in the substantially horizontal direction, and the bottom surface 2d serving as the mounting surface as illustrated in FIGS. One of various vertical postures extended in the vertical direction in the figure. If the device 10 is attached to the vehicle body in each of these postures, in the ventilation passage 50, the thick portion through hole 5, the communication hole 6 (and the inner opening 6a, the outer opening 6b, the ventilation waterproof film 7). ) Extends in the same direction as or intersects with the inner wall surface 37, and is inclined at a predetermined angle with respect to the bottom surface 2 d serving as a mounting surface of the apparatus 10 on the vehicle body side.

  For this reason, even if accumulated water (not shown) due to the intrusion water S or the like accumulates in the communication hole 6, the accumulated water at the time before the communication hole 6 is full (when a certain amount of accumulated water has accumulated). A part (water surface) reaches the upper end (outer opening 6b) of the communication hole 6 that is inclined, and is drained to the outside through the thick part through-hole 5, so that it is possible to suppress accumulation of accumulated water. . Therefore, the air-permeable waterproof membrane 7 is prevented from being blocked by the intruding water S and the like, and the air-permeable waterproof membrane 7 ensures the desired air permeability and breathability while being simple and reliable and durable. Can be improved. In the thick part through hole 5 and the communication hole 6 (and the inner opening 6a, the outer opening 6b, and the ventilation waterproof film 7), the inclination angle with respect to the bottom surface 2d is not particularly limited, but for example 45 degrees or 45 It may be set as appropriate within a predetermined range centered on degrees (an inclination angle of about 30 to 60 degrees).

≪Example of ventilation passage 50≫
The intrusion water S that enters the ventilation passage 50 can enter the ventilation passage 50 at various angles from the outer peripheral side of the housing 1 through the outer wall surface openings 36a and 36b. For example, the intrusion water S enters linearly. Although the water pressure of the intrusion water S may be relatively high, the shape of the thick part through hole 5, the communication hole 6, the outer wall surface openings 36a, 36b, etc. (hereinafter referred to as the thick part through hole 5 etc. as appropriate) By setting appropriately, the high water pressure intrusion water S as described above easily collides with the wall surface of the ventilation passage 50, and the water pressure of the intrusion water S can be sufficiently reduced. As one of the methods for reducing the water pressure of the intrusion water S as described above, for example, an angle at which the intrusion water S can enter is defined as shown below, and the shape of the thick part through hole 5 or the like is defined. It is possible to set.

First, the intrusion water S entering the inside of the ventilation passage 50 through the outer wall surface openings 36a and 36b is assumed as a projection line, and the projection line (that is, the intrusion water) S and the inner opening of the communication hole 6 are shown in FIG. The angle formed by the portion 6 a is θ ₁ , the opening width of the inner opening 6 a in the direction perpendicular to the two vertical lines perpendicular to the inner opening 6 a of the communication hole 6 from the projection line S is W, and the communication hole 6 The length in the communication direction is D, and the ratio D / W between W and D is tan θ ₂ . As tan θ ₁ becomes smaller than tan θ ₂ , the linear intrusion water S easily collides with the inner wall of the ventilation passage 50, so that the tan θ ₁ becomes relatively small (for example, the relational expression tan θ ₂ > The thick part through-hole 5 and the like are designed so that tan θ ₁ is satisfied (hereinafter referred to as relational expression α).

  In this way, by setting the thick part through-hole 5 and the like assuming an angle at which the intrusion water S can enter, the wall surface of the ventilation passage 50, that is, the inner wall surface 52 and the communication hole of the thick part through-hole 5 are provided. The inner wall surface 61 of the hole 6 (and the edge surface of the outer opening 6b and the like) easily functions as a barrier against the intrusion water S, and the water pressure of the intrusion water S that collides with the barrier is reduced. And in the ventilation waterproofing membrane 7 attached to the inner side opening part 6a of the communicating hole 6, the direct collision, damage, etc. by the intrusion water S which penetrates the inside of the ventilation path 50 linearly as mentioned above are suppressed. become.

The angle θ ₁ related to the intruding water S is formed, for example, by the mounting position of the electronic control device 10 with respect to the vehicle body, the shape of the housing 1 (the case 2 or the cover 3), or the thick part through hole 5 or the like. The range is determined by the position of the corner portion 30 (or the corner portion 35, etc.), and even if the intruding water S enters the inside of the ventilation passage 50 through the outer wall surface openings 36a and 36b within the range, tan θ1 Need only be provided with the thick part through hole 5 having a shape designed so as to be relatively small (for example, designed to satisfy the relational expression α), the shape of the thick part through hole 5 is required. As described above, the direct collision of the intrusion water S with respect to the ventilation waterproof film 7 is suppressed without reducing the distance or increasing the distance between the communication hole 6 and the outer wall surface openings 36a and 36b more than necessary. it can.

  For example, as shown in FIG. 10, even when the protrusion 62 is provided on the edge surface of the outer opening 6b (or the inner opening 6a) of the communication hole 6, tan θ1 can be easily reduced (the relational expression α is Easier to meet). In addition, for example, as shown in FIG. 11, when a protrusion 53 protruding in the direction of the communication hole 6 from a position facing the communication hole 6 on the inner wall surface 52 of the thick part through-hole 5 is provided, the protrusion The part 53 functions as a barrier against the ingress water S, and the direct collision of the ingress water S with respect to the communication hole 6 is further suppressed.

For example, as shown in FIG. 1, the distance between the communication hole 6 and the outer wall surface openings 36a and 36b is L, the opening width (height) of the outer wall surface openings 36a and 36b is H, L and H as tan .theta ₃ ratio H / L of the tan .theta ₃ so that the relatively small (e.g., equation tanθ _1> tanθ ₃ (hereinafter, so as to satisfy the referred relationship beta)) designed thick portion through hole Even when 5 or the like is applied, the inner wall surface 52 of the thick-walled through hole 5, the inner wall surface 61 of the communication hole 6 (and the edge surface of the outer opening 6b, etc.) function as a barrier against the intrusion water S. The water pressure of the intrusion water S is reduced, and as a result, the direct collision of the intrusion water S against the ventilation waterproofing membrane 7 is further suppressed.

  Further, by chamfering the corners of the thick-walled through-holes 5 and the like as appropriate to make them tapered, accumulated water due to, for example, intrusion water S (intrusion water whose water pressure is reduced by the barrier) or the like enters the communication holes 6 or the like. When it accumulates, it becomes easy to discharge the accumulated water from the inside of the communication hole 6 to the outside.

  Further, as described above, as a method for testing the airtightness in the electronic control device 10 having the filter function by the thick part through-hole 5 or the like, the outer wall surface openings 36a and 36b are sealed, for example, by a worker's hand. Alternatively, a method of sealing with a desired member and blowing air from the connector 42 side is known. However, if the opening edge surfaces of the outer wall surface openings 36a and 36b are flat, the sealing operation is performed. It becomes easy and it becomes possible to contribute to the efficiency improvement of an airtightness test. In the case of the electronic control device 10 shown in the drawing, each corner 35 formed between the outer wall surface 33 of the lower step portion 31 b and the outer wall surfaces 34 a and 34 b of the side wall portion 32 tapers as it approaches the corner portion 30. (In the so-called fillet-shaped corner 35, the shape gradually changed as the corner portion 30 is approached), whereby the area of the opening edge surfaces of the outer wall surface openings 36a, 36b of the outer wall surfaces 34a, 34b. Can be made sufficiently large, and it becomes easy to contribute to the efficiency of the sealing work.

≪Position of forming thick part through hole 5 etc.≫
The formation position of the thick part through-hole 5 and the like can be set as appropriate in the housing 1, and in addition to being formed in the corner portion 30 at a position facing the substrate mounting portion 20, the outer wall surface 33 in the housing 1. Formed in the corner 35 between the outer wall surface 34 and the outer wall surface 34, for example, outer wall surface openings 36a and 36b are formed in the outer wall surfaces 33 and 34, respectively, and the thick portion through-holes are formed so as to penetrate between the outer wall surfaces 33 and 34. 5 is formed, and a communication hole 6 that communicates the thick-walled portion through-hole 5 and the inside of the housing 1 is formed. The configuration includes various electronic components (non-heat generating property) of the circuit board 4. The position is preferably set so as not to interfere with the component 41a, the heat generating component 41b, and the like.

  Further, as shown in FIGS. 12 and 13, when the exothermic component 41 b is mounted on the peripheral side of the board mounting portion 20 on the circuit board 4 at a position close to the board mounting portion 20, the exothermic component 41 b emits. For example, the heat generation is absorbed by the board mounting portion 20 (screw 44 or the like) through the circuit board 4 as shown by the black arrow in FIG. Since heat is radiated through the ventilation passage 50 as indicated by the black arrows in the figure, it is possible to improve the heat radiation performance.

  Further, since the heat generated from the heat-generating component 41b has a characteristic of increasing, the general mounting posture of the electronic control device 10 with respect to the vehicle body, for example, the bottom surface 2d as the mounting surface as shown in FIG. For example, in the case of a vertically placed posture extended in the vertical direction in the figure and the corner portion 30 is located on the upper side, as shown by a black arrow in the figure, the ventilation passage 50 is used. It is easy to dissipate heat and it becomes possible to further improve the heat dissipating performance.

  Although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various modifications can be made within the scope of the technical idea of the present invention. It is natural that such changes and the like belong to the scope of the claims.

Here, technical ideas other than the claims that can be grasped from each of the embodiments and the like described above are listed below.
<A> An electronic control device characterized in that a vent passage between the outer wall surface opening and the vent waterproof membrane is bent.
<B> An electronic control device characterized in that the outer wall surfaces on which the respective outer wall surface openings are formed are inclined at different angles (intersecting angles).
<C> The electronic control characterized in that the opening (or / and the ventilation waterproof film) on the inside of the housing of the communication hole is formed at a position facing the board mounting portion for attaching the circuit board and the housing member. apparatus.
<D> An electronic control device characterized in that the thick portion is formed at a corner or corner of the casing member.
<E> An electronic control device characterized in that the opening edge surface of each outer wall surface opening is planar.
<F> The electronic control device, wherein the casing is attached to the vehicle body in such a posture that each outer wall surface opening is positioned above the vehicle body.
<G> An electronic control device characterized in that the inner wall surface of the communication hole and the ventilation waterproof film are formed at a predetermined angle with respect to the mounting surface of the housing on the vehicle body side.

1 ... Case 2 ... Case (Case member)
3. Cover (housing member)
DESCRIPTION OF SYMBOLS 4 ... Circuit board 5 ... Thick part through-hole 6 ... Communication hole 7 ... Breathable waterproof film 10 ... Electronic control unit 20 ... Board attachment part 30 ... Corner part (thick part)
35 ... Corner (thick part)
36a, 36b ... Opening of outer wall surface 50 ... Ventilation passage 50a ... Bending part

Claims (7)

An electronic control device in which a circuit board on which electronic components are mounted is housed in an internal space of a housing formed by joining a plurality of housing members,
And the outer wall surface opening you position at a distance from one another on the outer wall surface of said housing member,
A through-hole penetrating between each of the outer wall surface openings through the inside of the outer wall surface of the corner portion where the wall portions of the casing member forming the inner space intersect ,
A communication hole communicating between the internal space of the housing and the through hole;
A breathable and waterproof breathable waterproof membrane attached to the opening inside the housing of the communication hole;
Electronic control apparatus characterized by comprising a. The wall portion is a side wall portion of the housing member,
The outer wall surface opening is located on the outer wall surface of each side wall portion where the corner portions are formed by crossing each other;
The electronic control device according to claim 1. The wall portion is an upper wall portion of the housing member that covers a side wall portion of the housing member and an upper portion of the circuit board,
The outer wall surface opening is located on the side wall and the upper wall,
The through hole passes through the inside of the outer wall surface at the corner where the side wall and the upper wall intersect,
The electronic control device according to claim 1. The corner is an inclined surface;
The electronic control device according to claim 2 or 3, wherein The corner portion has a thick portion,
The through hole and the communication hole are provided in the thick portion;
The electronic control device according to any one of claims 2 to 4. 6. The electronic control device according to claim 5 , wherein the thick portion is formed at a position facing a substrate mounting portion for attaching the circuit board and the housing member. The electronic control device according to claim 6 , wherein the heat generating component mounted on the circuit board is located on a peripheral side of the board mounting portion of the circuit board.

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