JP2014170669A - Electronic controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a sealing function reliably exhibited regarding an electronic controller in which a circuit board having a connector mounted thereon is accommodated in an internal space of an enclosure and the internal space is sealed with a sealing material to constitute a water-proof space.SOLUTION: This electronic controller has a circuit board, a connector in which some of a plurality of terminals is held to a housing, a lower case as an enclosure having an opening in its top face, and an upper case disposed so as to cover the opening of the lower case. In the lower case, a substantially trapezoidal open part for the connector is formed so that a part of the housing protrudes to the outside of the enclosure. A sealing material is provided for making the inside of the enclosure constitute a water-proof space by the lower case and upper case. A recess is possessed in at least a trapezoidal leg part among the peripheral part of the lower case, and the housing surface has a projection engaging with the recess. At the bottom of the recess, a rib extending along the recess is formed. The rib is formed in plurality across a virtual line passing through a midpoint at the bottom of the recess in a cross section orthogonal to the extending direction of the recess.

Description

  The present invention relates to an electronic control device in which a circuit board on which a connector is mounted is accommodated in an internal space of a housing, and the internal space is made a waterproof space by a sealing material.

  Conventionally, in order to protect the electronic components constituting the electronic control unit (ECU) from moisture caused by raindrops, etc., the circuit board on which the electronic components are mounted is configured to be accommodated in a housing having a waterproof space. An electronic control device is known. For example, Patent Document 1 includes a substantially trapezoidal connector, a case configured to be fitted with the connector, and a sealing material that is disposed between the connector and the case and seals between them. Electronic control devices have been proposed.

JP 2004-319169 A

  However, when the casing is configured by fitting a plurality of members as in the electronic control device described in Patent Document 1, the seal material may be displaced at the connection portion between the members including the connector. is there. The displacement of the sealing material often occurs when the sealing material comes into contact with each member during alignment when the respective members are fitted. For example, the seal material applied to the case comes into contact with the connector before it is completely fitted, and is displaced during alignment. In particular, a substantially trapezoidal slope portion (a portion corresponding to a trapezoidal leg) into which the connector is fitted in the case has many chances of contact between the connector and the seal material, and therefore the seal material is likely to be displaced. For this reason, there exists a possibility that the sealing function of a sealing material may fall.

  The present invention has been made in view of the above problems, and an object of the present invention is to more reliably exhibit a sealing function.

In order to achieve the above object, the present invention provides a circuit board (20) on which an electronic component is mounted,
A part of a plurality of terminals for electrically connecting the circuit board and the external connector is divided in the thickness direction of the circuit board and the connector (30) respectively held by the housing (31) made of an insulating material. Has a lower case (41) in which a connector is fitted into one surface of the side surface (41a), and an upper case (43) arranged so as to cover the opening of the lower case. The remaining portion of the connector and the circuit board are accommodated in the internal space while part of the connector is exposed to the outside through the connector opening (44) formed in a state where the upper case and the lower case are assembled. Between the facing portion of the casing (40), the peripheral portion (41b) of the lower case, and the peripheral portion (43a) of the upper case, between the opposing portions of the peripheral portion of the lower case and the housing surface, Perimeter and c Respectively provided between the opposing portions interposed seal material between the managing surface (50), a
The sealing material includes an outer peripheral sealing material (51) disposed between the peripheral portion of the upper case and the peripheral portion of the lower case, and a connector upper sealing material disposed between the peripheral portion of the upper case and the housing surface. (52), and a connector lower seal material (53) disposed between the peripheral portion of the lower case and the housing surface, and an outer peripheral seal material (51) and a connector upper seal material (52). And the connector lower seal material (53) are connected to each other, and the internal space of the housing is a waterproof space,
In the peripheral portion of the lower case, the portion constituting the connector opening is trapezoidal, and at least the trapezoidal leg (41b1) has a recess (45) extending along the peripheral edge, The surface of the housing that faces the peripheral edge of the lower case has a convex part (32) corresponding to the concave part, and the rib ( 46), and a plurality of ribs are formed across a virtual line (C) passing through the midpoint of the bottom of the recess in a cross section perpendicular to the extending direction of the recess.

  In such a configuration, the bottom of the recess has a rib. A plurality of ribs are formed across an imaginary line passing through the midpoint of the bottom of the recess. According to this, in the step of applying the sealing material, the sealing material applied to the center of the recess is arranged in contact with the edge portion of the rib in the cross section orthogonal to the extending direction of the recess. For this reason, even if a housing contacts a sealing material, it can suppress that a sealing material approaches the one side surface of a recessed part, and is unevenly distributed by the drag by the edge part of a rib. Moreover, by having a rib, the creepage distance of the bottom part of a recessed part can be lengthened compared with the structure without a rib in the cross section orthogonal to the extending direction of a rib. For this reason, it is possible to lengthen the leak path between the inside and outside with the sealing material interposed therebetween. Therefore, the sealing function can be exhibited more reliably.

  In particular, in the lower case, the rib is formed in a portion corresponding to a trapezoidal leg (referred to as a trapezoidal leg in the claims) among the portions constituting the substantially trapezoidal connector opening. ing. Since the portion corresponding to the trapezoidal leg has many opportunities for contact between the connector and the sealing material, the sealing material is likely to be displaced. For this reason, at least the trapezoidal leg portion has the rib, thereby suppressing the displacement of the sealing material and improving the sealing function.

  More preferably, in a cross section orthogonal to the extending direction of the recess, a differentiable curved surface is formed by the opposing side surfaces (46a1, 46b1) of the adjacent ribs and the bottom of the recess, and the side surface of the recess ( 45b, 45c), a rib side surface (46a2, 46b2) facing the side surface of the concave portion, and a bottom portion of the concave portion may form a differentiable curved surface.

  Generally, the sealing material is injected and extended from a circular nozzle. For this reason, in the cross section orthogonal to the extending direction of the rib, the cross section of the sealing material is substantially circular. As described above, since the bottom of the concave portion of the case has a differentiable curved surface, in the step of applying the sealing material to the case, the substantially circular sealing material and the bottom of the curved concave portion are surfaces. A sealing material can be arranged to contact. For this reason, in the process of assembling the housing, the seal material can be sealed without leaving a void when the seal material is deformed.

It is a disassembled perspective view which shows the outline | summary of the electronic control apparatus which concerns on 1st Embodiment. It is a perspective view which shows the outline | summary of the electronic control apparatus after attaching a circuit board in a housing | casing. FIG. 3 is a cross-sectional view of the electronic control device when cut along the III plane shown in FIG. 2. It is sectional drawing which shows the detail of IV area | region shown in FIG. It is an expansion perspective view which shows a part of peripheral part in the lower case of the V area | region shown in FIG. 1, especially the trapezoid leg part. FIG. 4 is a cross-sectional view showing details of an IV region shown in FIG. 3 in an electronic control device according to a modified example of the first embodiment. FIG. 4 is a sectional view showing details of an IV region shown in FIG. 3 in an electronic control device according to a second embodiment. FIG. 4 is a cross-sectional view showing details of an IV region shown in FIG. 3 in an electronic control device according to another embodiment. FIG. 4 is a cross-sectional view showing details of an IV region shown in FIG. 3 in an electronic control device according to another embodiment. FIG. 4 is a cross-sectional view showing details of an IV region shown in FIG. 3 in an electronic control device according to another embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same reference numerals are given to the same or equivalent parts.

(First embodiment)
Initially, with reference to FIGS. 1-3, schematic structure of the electronic controller which concerns on this embodiment is demonstrated.

  The electronic control device 10 according to the present embodiment is an engine ECU mounted on a car, for example. As shown in FIG. 1, a circuit board 20 on which electronic components are mounted, a connector 30 fixed to the circuit board 20, a part of the connector 30 being exposed to the outside, and the remaining part of the connector 30 and the circuit board And a housing 40 for accommodating 20 in the internal space.

  The circuit board 20 has a circuit pattern and electronic components (not shown), and these electronic components control an automobile engine and engine peripheral devices. The circuit board 20 is fixed to the housing 40 by screws 21.

  The connector 30 has a housing 31. A part of a terminal 32 (shown in FIG. 3) for electrically connecting an external connector (not shown) and an electronic component mounted on the circuit board 20 is fixed to the housing 31. By fitting the external connector into the connector 30, the electronic component and the external circuit are electrically connected.

  The housing 40 includes a lower case 41 whose upper surface is open, and an upper case 43 that is fixed to the lower case 41 with screws 42 so as to cover the opening of the lower case 41. In the present embodiment, the circuit board 20 is fixed to the lower case with screws 21. On one side surface 41 a of the lower case 41, a connector opening 44 for exposing a part of the housing 31 of the connector 30 to the outside of the housing 40 is formed. The connector opening 44 in the present embodiment has a substantially trapezoidal shape so that the housing 31 of the connector 30 is fitted therein. More specifically, in the trapezoidal shape, the lower case constitutes the upper bottom (41b2 shown in FIG. 1) and two legs (41b1 shown in FIG. 1), and the upper case constitutes the lower bottom. Forms a trapezoid.

  That is, as shown in FIG. 2, the electronic control device 10 according to the present embodiment has a connector opening formed in the side surface 41 a in a state where the upper case 43 and the lower case 41 constituting the housing 40 are assembled. A part of the connector 30 (a part of the housing 31) is exposed to the outside via 44, and the circuit board 20 is positioned in the internal space of the housing 40.

  As shown in FIG. 3, the electronic control device 10 according to the present embodiment has an internal space of the housing 40 in a state where the upper case 43, the lower case 41, the circuit board 20 and the connector 30 are assembled. A sealing material 50 is provided so as to provide a waterproof space. The sealing material 50 includes an outer peripheral sealing material 51 disposed between the peripheral edge 43 a of the upper case 43 and the peripheral edge 41 b of the lower case 41. In addition, the connector upper sealing member 52 is provided between the peripheral portion 43 a of the upper case 43 and the surface of the housing 31. Furthermore, a connector lower seal material 53 is provided between the peripheral edge portion 41 b of the lower case 41 and the surface of the housing 31. The sealing material 50 in this embodiment is configured such that the outer peripheral sealing material 51, the connector upper sealing material 52, and the connector lower sealing material 53 are connected to each other and the internal space of the housing 40 is sealed.

  Next, with reference to FIGS. 4 and 5, the shapes of the peripheral portions 41 b and 43 a and the housing 31 that are in contact with the sealing material 50, which are features of the present invention, will be described. Below, the shape of the part which comprises the opening part 44 for connectors among the housing | casing 40 is demonstrated in detail. That is, of the peripheral portion 41b of the lower case 41, the shape of the upper bottom portion 41b2 constituting a substantially trapezoid, the trapezoidal leg portion 41b1, and the surface of the housing 31 facing the peripheral portion 41b will be described in detail.

  The peripheral portion 41b (including the upper bottom portion 41b1 and the leg portion 41b2) of the lower case 41 has a recess 45. The recessed part 45 is extended so that the circumference may be drawn over the whole peripheral part 41b. And the housing 31 of the connector 30 has the convex part 32 corresponding to the recessed part 45 in the surface 31a facing the peripheral part 41b. In the conventional waterproof structure, the concave portion 45 of the lower case 41 and the convex portion 32 of the housing 31 are engaged with each other via the connector lower seal portion 53 to suppress the displacement of the sealing material. On the other hand, in this embodiment, in order to further suppress the displacement of the sealing material, in addition to the conventional configuration, as shown in FIG. 4, two ribs 46 a and 46 b (hereinafter, a plurality of ribs 46 a) The reference numerals of the ribs are collectively indicated as 46). Similarly to the recess 45, the rib 46 extends so as to draw a circumference along the recess 45. Further, in the cross section orthogonal to the extending direction of the concave portion 45 (the cross section shown in FIG. 4), two ribs 46 are formed across an imaginary line C passing through the midpoint of the bottom portion 45 a of the concave portion 45. In particular, in the present embodiment, the ribs 46 a and the ribs 46 b are arranged symmetrically with respect to the virtual line C.

  In the present embodiment, in a cross section orthogonal to the extending direction of the recess 45, a curve constituted by the side surfaces 46a1 and 46b1 facing each other of the adjacent ribs 46a and 46b and a part of the bottom 45a is configured as a differentiable string. . Further, a curve constituted by one side surface 45b of the recess 45, a side surface 46a2 of the rib 46 facing the side surface 45b, and a part of the bottom portion 45a is configured as a differentiable string. Further, a curved line constituted by a part of the other side surface 45c of the recess 45, a side surface 46b2 of the rib 46 facing the side surface 45c, and a bottom portion 45a is configured as a differentiable string. These strings are curves that protrude toward the bottom 45a of the recess 45. The string is continuous in the extending direction of the recess 45, and the rib 46 is disposed in the recess 45 of the lower case 41, and the bottom 45 a and the side surfaces 45 b and 45 c of the recess 45, and the side surface of the rib 46. 46a1, 46a2, 46b1, and 56b2 are configured as smooth curved surfaces.

  In the present embodiment, the second rib 33 different from the rib 46 is extended on the tip end surface 32 a of the convex portion 32 of the housing 31. The second ribs 33 are formed alternately with the ribs 46 in a cross section orthogonal to the extending direction of the recess 45. Further, the second rib 33 has a curved surface shape corresponding to the curved surface between the adjacent ribs 46 a and 46 b formed in the lower case 41. Specifically, in the cross section orthogonal to the extending direction of the rib 33, the rib 33 is formed to have a convex cross section on the bottom 45 side of the lower case 41, and the vertex of the curved surface is on the imaginary line C. Located in.

  In the present embodiment, not only the peripheral portion 41b of the lower case 41 and the surface of the housing 31 opposed to the peripheral portion 41b sandwiching the connector lower seal material 53 as described above, but also the outer periphery as shown in FIG. The shape of the peripheral portion 41b of the lower case 41 and the shape of the peripheral portion 43a of the upper case 43 facing the peripheral portion 41b sandwiching the sealing material 51 is also configured. That is, the above-described housing 31 is replaced with the upper case 43. 5 is an enlarged view of the region V in FIG. 1. A broken line in FIG. 5 indicates a hidden line of the lower case 41, and a two-dot chain line indicates the sealing material 50 immediately after application. Similarly, the surface of the housing 31 and the shape of the peripheral edge 43a of the upper case 43 that sandwich the connector upper sealing material 52 are configured in the same manner. That is, the above-described housing 31 is replaced with the upper case 43, and the lower case 41 is replaced with the housing 31.

  When the width of the bottom 45a of the lower case 41 is approximately 3 mm, for example, and the distance between the bottom 45a and the front end surface 32a of the convex portion 32 of the housing 30 is approximately 1 mm, for example, the height of the rib 46 is approximately It may be 0.5 mm or less.

  Next, functions and effects resulting from having the electronic control device 10 according to the present embodiment, in particular, having the rib 46 and the second rib 33 will be described.

  In the configuration described above, the bottom 45 a of the recess 45 has the rib 46. A plurality of ribs 46 are formed across an imaginary line C passing through the midpoint of the bottom 45a. According to this, in the step of applying the sealing material 50, the sealing material 50 applied to the center of the recess 45 in the cross section orthogonal to the extending direction of the recess 45 becomes the edge portion of the rib 46 (E and E in FIG. 4). The portion shown in FIG. For this reason, even if the housing 31 comes into contact with the sealing material 50, the sealing material 50 is unevenly distributed near one of the side surfaces 45 b and 45 c of the concave portion 45 due to the drag by the edge portion E of the rib 46. Can be suppressed. That is, the sealing material 50 is fixed around a recess formed between the adjacent ribs 46a and 46b. For this reason, the sealing material 50 can be arrange | positioned substantially uniformly over the recessed part 45 whole. In addition, by having the ribs 46, the creepage distance of the bottom 45 a of the recess 45 can be made longer in the cross section perpendicular to the extending direction of the ribs 46 than in the configuration without the ribs 46. For this reason, the leak path can be lengthened between the inside and outside with the sealing material 50 interposed therebetween. Therefore, the sealing function can be exhibited more reliably.

  In particular, in the lower case 41, the rib 46 is formed on the trapezoidal leg portion 41b1 among the portions constituting the connector opening having a substantially trapezoidal shape. In the trapezoidal leg portion 41b1, since there are many opportunities for contact between the connector 30 and the sealing material 50, the sealing material 50 is likely to be displaced. For this reason, at least the trapezoidal leg portion 41b1 has the ribs 46, thereby suppressing the displacement of the sealing material 50 and improving the sealing function.

  In the electronic control device 10 of the present embodiment, the bottom 45a and the side surfaces 45b and 45c of the recess 45 in which the rib 46 is formed, and the side surfaces 46a1, 46a2, 46b1, and 56b2 of the rib 46 are configured as smooth curved surfaces. . In general, the sealing material 50 is injected and extended from a circular nozzle. For this reason, in the cross section orthogonal to the extending direction of the rib 46, the cross section of the sealing material 50 is substantially circular. As described above, the bottom 45a and the side surfaces 45b and 45c of the recess 45 and the side surfaces 46a1, 46a2, 46b1, and 56b2 of the rib 46 are differentiable curved surfaces, so that the sealing material 50 is applied to the lower case 41. The sealing material is arranged so that the substantially circular sealing material 50 and the bottom of the curved concave portion (the portion constituted by the bottom 45a and the side surfaces 46a1 and 46b1 of the rib 46) are in surface contact with each other. can do. For this reason, in the process of assembling the housing, the seal material can be sealed without leaving a void when the seal material is deformed. Further, since the other bottom portion (the portion constituted by the bottom portion 45a, the side surfaces 45b and 45c, and the side surfaces 46a2 and 46b2 of the rib 46) is a curved surface, in the process of assembling the housing, It is possible to suppress a gap from being formed between the lower case 41 and the lower case 41. Therefore, the sealing function can be exhibited more reliably.

  Further, in the present embodiment, the second rib 33 is provided on the tip surface 32 a of the convex portion 32 of the housing 31. Since the second rib 33 is formed corresponding to the shape of the recess between the ribs 46a and 46b, the anchor effect for the sealing material 50 can be exhibited. Thereby, the shift | offset | difference of the sealing material 50 can be suppressed more, and a sealing function can be exhibited reliably.

(Modification of the first embodiment)
In the above-described embodiment, the second rib 33 is provided on the distal end surface 32a of the convex portion 32 of the housing 31, but the second rib 33 is not necessarily formed. As shown in FIG. 6, at least the rib 46 may be formed on the bottom 45 of the recess.

(Second Embodiment)
In 1st Embodiment, the rib 45 formed in the recessed part 45 of the lower case 41 showed the form which has a curved surface. On the other hand, in the present embodiment, as shown in FIG. 7, an example in which the rib 46 has a triangular cross section in the cross section orthogonal to the extending direction of the recess 45 is shown.

  The bottom 45a of the recess 45 has two ribs 46a and 46b. The rib 46 in the present embodiment is also extended so as to draw a circumference along the recess 45. Further, in the cross section orthogonal to the extending direction of the recess 45 (the cross section shown in FIG. 7), two imaginary lines C are formed, and the ribs 46 a and the ribs 46 b are arranged symmetrically with respect to the imaginary line C. The

  The rib 46 in this embodiment has a triangular cross section. That is, the side surfaces 46a1 and 46a2 of the rib 46a are inclined with respect to the bottom 45a (having an angle greater than 0 degrees and smaller than 90 degrees). Further, the side surfaces 46b1 and 46b2 of the rib 46b are inclined with respect to the bottom 45a.

  Further, similarly to the first embodiment, a second rib 33 different from the rib 46 is extended on the tip surface 32 a of the convex portion 32 of the housing 31. The second rib 33 has a shape corresponding to a substantially trapezoidal depression formed by the side surfaces 46a1 and 46b1 of the adjacent ribs 46a and 46b formed on the lower case 41 and the bottom 45a. In the present embodiment, in the cross section orthogonal to the extending direction of the rib 33, the rib 33 is formed to have a triangular cross section that protrudes toward the bottom 45 of the lower case 41, and the apex that faces the lower case 41 is virtual. Located on line C.

  Also in the above-described configuration, the sealing material 50 is fixed around the recess formed between the adjacent ribs 46a and 46b. For this reason, as in the first embodiment, the sealing material 50 can be prevented from being unevenly distributed near one side surface (45b or 45c) of the recess 45. In addition, by having the ribs 46, the creepage distance of the bottom 45 a of the recess 45 can be made longer in the cross section perpendicular to the extending direction of the ribs 46 than in the configuration without the ribs 46. For this reason, the leak path can be lengthened between the inside and outside with the sealing material 50 interposed therebetween. Therefore, the sealing function can be exhibited more reliably.

  In the present embodiment, the side surfaces 46a1 and 46a2 of the rib 46a are inclined with respect to the bottom 45a. Further, the side surfaces 46b1 and 46b2 of the rib 46b are inclined with respect to the bottom 45a. According to this, in the step of applying the sealing material 50 to the lower case 41, the sealing material 50 and the recessed portion are brought into more surface contact than when the side surface of the rib 46 is perpendicular to the bottom 45a. State. For this reason, it can seal without leaving a void. Therefore, the sealing function can be exhibited more reliably.

  Also in the present embodiment, the second rib 33 is provided on the tip surface 32 a of the convex portion 32 of the housing 31. Since the second rib 33 is formed corresponding to the shape of the recess between the ribs 46a and 46b, the anchor effect for the sealing material 50 can be exhibited.

(Other embodiments)
The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In each of the above embodiments, two ribs 46 of the lower case 41 are formed and one second rib 33 of the housing 31 is formed. However, the present invention is not limited to the above example. For example, as shown in FIG. 8, three ribs 46 may be formed. And in the form shown in FIG. 8, the 2nd rib 33 corresponding to the shape of the dent formed between the adjacent ribs 46 is formed. Also in the present embodiment, at least a pair of ribs 46 are formed across a virtual line C passing through the midpoint of the bottom 45a of the recess 45.

  In each of the above-described embodiments, the example in which the second rib 33 is formed is shown, but the second rib 33 is not necessarily formed. However, the anchor effect with respect to the sealing material 50 can be exhibited by providing the second rib 33.

  Further, the cross-sectional shape of the rib 46 formed in the recess 45 of the lower case 41 and the second rib 33 formed on the surface of the housing 31 is not limited to the above example. For example, as shown in FIG. 9, the rib 46 may have a rectangular cross section, or may have a semicircular shape as shown in FIG. 9 and 10 show an example in which the second rib 33 is not formed.

  In the above description, the peripheral shape 41b of the lower case 41 that sandwiches the connector lower seal portion 53 and the shape of the surface of the housing 31 that faces the peripheral portion 41b have been described. However, the lower case 41 that sandwiches the outer seal portion 51 is described. The same applies to the shape of the peripheral edge portion 41b of the upper case 43 that faces the peripheral edge portion 41b and the peripheral edge portion 41b. In this case, the above-described housing 31 may be replaced with the upper case 43. Similarly, the present invention can be applied to the shape of the surface of the housing 31 and the peripheral portion 43a of the upper case 43 that sandwich the connector upper seal portion 52. In this case, the housing 31 described above may be replaced with the upper case 43, and the lower case 41 may be replaced with the housing 31.

  In each of the above-described embodiments, the example in which the rib 46 is formed in a circumferential shape over the entire peripheral edge portion 41b of the lower case 41 has been described. However, the rib 46 does not necessarily have to be formed over the whole. It suffices to form at least the trapezoidal leg portion 41b1, which is a portion into which the connector 30 is fitted. In the connector opening 44, the fitting shape with the connector 30 is more complicated than the peripheral edge 41 b except for the connector opening 44. For this reason, when the lower case 41 and the connector 30 are fitted, the connector lower seal portion 53 tends to be unevenly distributed in the recess 45 of the lower case 41. On the other hand, by using the lower case 41 in which the ribs 46 are formed as in the above-described embodiments, the sealing function can be more reliably exhibited.

DESCRIPTION OF SYMBOLS 10 ... Electronic control unit 30 ... Connector 31 ... Housing 32 ... Protruding part 33 ... Second rib 41 ... Lower case, 41b1 ... Trapezoidal leg part 45 ... Recess, 45a ... bottom 46a, 46b ... rib

Claims (6)

A circuit board (20) on which electronic components are mounted;
A connector (30) in which one part of a plurality of terminals for electrically connecting the circuit board and the external connector is held in a housing (31) made of an insulating material,
A lower case (41) that is divided in the thickness direction of the circuit board, has an upper surface opened, and is adapted to fit the connector on one surface of the side surface (41a), and covers the opening of the lower case. And a part of the connector is exposed to the outside through a connector opening (44) formed in a state where the upper case and the lower case are assembled. A housing (40) for accommodating the remaining portion of the connector and the circuit board in an internal space,
Between the opposing part of the peripheral part (41b) of the lower case and the peripheral part (43a) of the upper case, between the opposing part of the peripheral part of the lower case and the housing surface, and the peripheral part of the upper case A sealing material (50) interposed between portions facing the housing surface,
The sealing material is disposed between an outer peripheral sealing material (51) disposed between a peripheral portion of the upper case and a peripheral portion of the lower case, and between the peripheral portion of the upper case and the surface of the housing. A connector upper seal material (52), and a connector lower seal material (53) disposed between a peripheral edge of the lower case and the housing surface;
The outer peripheral sealing material (51), the connector upper sealing material (52), and the connector lower sealing material (53) are connected to each other so that the internal space of the housing is a waterproof space. Because
In the peripheral portion of the lower case, the portion constituting the connector opening is trapezoidal,
At least the trapezoidal leg (41b1) has a recess (45) extending along the periphery, and the housing surface of the connector facing the periphery of the lower case is a protrusion corresponding to the recess. Part (32),
A rib (46) extending along the recess is formed at the bottom (45a) of the recess at the peripheral edge of the lower case,
The electronic control device according to claim 1, wherein a plurality of the ribs are formed across a virtual line (C) passing through a midpoint of the bottom of the recess in a cross section orthogonal to the extending direction of the recess. The concave portion formed in the peripheral portion of the lower case and the rib are formed over the entire peripheral portion of the lower case, and
2. The electronic control device according to claim 1, further comprising: a convex portion corresponding to the concave portion over the entire periphery of the upper case facing the peripheral portion of the lower case. In a cross section perpendicular to the extending direction of the recess,
A differentiable curved surface is formed by the opposing side surfaces (46a1, 46b1) of the adjacent ribs and the bottom of the recess,
A differentiable curved surface is formed by the side surface (45b, 45c) of the recess, the side surface (46a2, 46b2) of the rib facing the side surface of the recess, and the bottom of the recess. The electronic control device according to claim 1 or 2.   The electronic control device according to claim 1, wherein a side surface of the rib is inclined with respect to a bottom surface of the recess. In a cross section perpendicular to the extending direction of the recess,
The electronic control device according to claim 4, wherein the rib has a triangular shape. A second rib (33) extending along the extending direction of the rib on the front end surface (32a) of the convex portion of the connector corresponding to the concave portion in which the rib is formed;
6. The electronic control device according to claim 1, wherein the second rib is formed alternately with the rib in a cross section orthogonal to the extending direction of the concave portion.

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