Electronic control unit

Abstract

A housing (2) accommodating a circuit board has a body member (3) covering one side of the circuit board, and a cover member (4) covering the side of the circuit board opposite the body member (3). The body member (3) has a sealing groove (8) which is located further outward than the accommodation position of the circuit board and is filled with a sealant, and a first linking section (15) provided inside the sealing groove (8). The cover member (4) has an outer peripheral cover wall (22), the leading edge of which is inserted into the sealing groove (8), and a second linking section (25) provided to the outer peripheral cover wall (22). The second linking section (25) links to the first linking section (15) inside the sealing groove (8) so as not to cause the leading edge of the outer peripheral cover wall (22) to slip out of the sealing groove (8).

Description

Technical Field

[0001] The present invention relates to an electronic control device.

Background Art

[0002] For example, Patent Document 1 discloses an electronic control device in which a circuit board is housed in a housing formed by joining a first case and a second case via a sealing material.

[0003] In this Patent Document 1, the first case and the second case are joined by inserting a joint portion formed by bending the side wall of the case body of the second case into a groove provided at the peripheral edge of the first case via a sealing material.

[0004] Also, in Patent Document 1, the first case and the second case are connected by a snap fit in which a case fixing projection of the second case is engaged with a case engagement groove of the first case. [[ID=2|1]]

[0005] The case engagement groove is provided in a bracket mounting portion adjacent to the groove at the peripheral edge of the first case.

[0006] The case fixing projection is formed by partially extending a folded-back portion constituting the joint portion of the second case and projecting it from the folded-back portion. The folded-back portion of the second case is formed by folding back the lower end portion of the side wall of the second case to the outside of the second case.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in Patent Document 1, the case engagement projection protrudes outward from the side wall of the second case. Furthermore, the case engagement groove into which this case engagement projection engages inevitably protrudes outward from the side wall of the second case.

[0009] In other words, while Patent Document 1 makes it possible to fix the first and second cases together using a case engagement groove and a case fixing projection, the case engagement groove and the case fixing projection protrude outwards, which results in the first and second cases becoming larger. [Means for solving the problem]

[0010] The electronic control device of the present invention has a housing for housing a circuit board on which electronic components are mounted, the housing comprising a first housing that covers one side of the circuit board and a second housing that covers one side of the circuit board from the opposite side of the first housing. The first housing has a seal groove located outside the housing position of the circuit board and filled with a sealing material, and a first connecting portion provided within the seal groove. The second housing has an outer peripheral wall whose tip is inserted into the seal groove, and a second connecting portion provided on the outer peripheral wall. The second connecting portion is connected to the first connecting portion so that the tip of the outer peripheral wall does not come out of the seal groove within the seal groove. Furthermore, the electronic control device may have a first connecting portion formed below the seal groove, and the second connecting portion may be connected to the first connecting portion by passing through a bottom wall through-hole formed in the bottom wall of the seal groove, so that the tip of the outer peripheral wall does not come out of the seal groove. [Effects of the Invention]

[0011] According to the present invention, the amount of expansion (bulging, protrusion) of the seal grooves on the outer circumference side of the first and second housings can be suppressed, and the housing as a whole can be made smaller. [Brief explanation of the drawing]

[0012] [Figure 1] Perspective view of an electronic control device according to the first embodiment of the present invention. [Figure 2] Front view of an electronic control device according to the first embodiment of the present invention. [Figure 3] Enlarged view of the main part in the sectional view taken along line A-A of FIG. 2. [Figure 4] Plan view of the body member of an electronic control device according to the first embodiment of the present invention. [Figure 5] Enlarged view of part B in FIG. 4. [Figure 6] Enlarged view of the main part in the sectional view taken along line C-C of FIG. 2. [Figure 7] Enlarged view of the main part of an electronic control device according to another embodiment of the present invention. [Figure 8] Front view of an electronic control device according to the second embodiment of the present invention. [Figure 9] Enlarged view of the main part in the sectional view taken along line D-D of FIG. 8. [Figure 10] Front view of an electronic control device according to the third embodiment of the present invention. [Figure 11] Enlarged view of the main part in the sectional view taken along line E-E of FIG. 10. [Figure 12] Cross-sectional view corresponding to the position along line F-F of FIG. 1. [Figure 13] Enlarged view of part G in FIG. 12. [Figure 14] Front view of an electronic control device according to the fourth embodiment of the present invention. [Figure 15] Enlarged view of the main part in the sectional view taken along line H-H of FIG. 14.

Mode for Carrying Out the Invention

[0013] Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

[0014] FIG. 1 is a perspective view of an electronic control device 1 according to a first embodiment of the present invention. FIG. 2 is a front view of the electronic control device 1 according to the first embodiment of the present invention. FIG. 3 is an enlarged view of a main part in a cross-sectional view taken along line A-A of FIG. 2. FIG. 4 is a plan view of a body member 3 of the electronic control device 1 according to the first embodiment of the present invention. FIG. 5 is an enlarged view of part B in FIG. 4. FIG. 6 is an enlarged view of a main part in a cross-sectional view taken along line C-C of FIG. 2.

[0015] The electronic control device 1 is used, for example, in an anti-lock brake system (ABS) for an automobile or a vehicle skid prevention system, etc., and controls various hydraulic control devices such as a hydraulic control solenoid. Specifically, for example, it is interposed between a master cylinder of a vehicle and a wheel cylinder of each wheel, and controls the brake hydraulic pressure supplied to the wheel cylinder of each wheel based on the wheel speed or the like.

[0016] The electronic control device 1 has a rectangular parallelepiped housing 2 in which a circuit board (not shown) on which a large number of electronic components are mounted is housed.

[0017] As shown in FIGS. 1 and 2, the housing 2 has a body member 3 as a first housing and a cover member 4 as a second housing.

[0018] The body member 3 is, for example, a die-molded product having a dish shape made of a hard synthetic resin material. The body member 3 has an outer shape in a plan view that is one size larger than that of the cover member 4 in a rectangular (rectangular) shape, and covers one side of the circuit board.

[0019] As shown in FIGS. 1 to 4, the body member 3 has a rectangular body bottom wall 5, a body first outer peripheral wall 6 and a body second outer peripheral wall 7 rising from the outer peripheral edge of the body bottom wall 5, and a seal groove 8 formed between the body first outer peripheral wall 6 and the body second outer peripheral wall 7.

[0020] The first outer peripheral wall 6 and the second outer peripheral wall 7 of the body are located on the outer periphery of the circuit board housing portion 9 in which the circuit board is housed, and are formed to be continuous in an annular manner around the entire outer edge of the body bottom wall 5. The first outer peripheral wall 6 of the body is the outermost outer peripheral wall of the body member 3 and is formed to be continuous around the entire outer edge of the body bottom wall 5. The second outer peripheral wall 7 of the body is an outer peripheral wall located on the inner periphery of the first outer peripheral wall 6 and is formed to be continuous around the entire outer edge of the body bottom wall 5.

[0021] The seal groove 8 is a groove with a substantially U-shaped cross-section and is located on the outer periphery of the second outer periphery wall 7 of the body. In other words, the seal groove 8 is located outside the housing position of the circuit board and is formed to be continuous in an annular manner around the entire circumference of the outer edge of the bottom wall 5 of the body. The seal groove 8 is formed on the outside of the second outer periphery wall 7 of the body and on the inside of the first outer periphery wall 6 of the body. The seal groove 8 has an inner wall surface 8a that is continuous with the outer surface 7a of the second outer periphery wall 7 of the body, an outer wall surface 8b that is continuous with the inner surface 6a of the first outer periphery wall 6 of the body, and a bottom surface 8c that is between wall surfaces 8a and 8b and continuous with both. The seal groove 8 is filled with, for example, a thermosetting sealant 10.

[0022] A first connecting portion 15 is formed on the inner wall surface 8a of the seal groove 8. In other words, the body member 3 has a first connecting portion 15. One first connecting portion 15 is formed on each side of the body member 3, for example. Here, each side of the body member 3 refers to the outer contour line that constitutes the outline of the body member 3 when viewed from above, and in this embodiment there are four sides. In the first embodiment, the first connecting portion 15 is a projection that protrudes outward from the wall surface 8a. Also, the first connecting portion 15 is located inside the seal groove 8.

[0023] Furthermore, the body member 3 has a bag-shaped pocket portion 16 capable of accommodating the second connecting portion 25, which will be described later. The pocket portion 16 is formed at the location where the first connecting portion 15 is formed, and is formed in such a way that the seal groove 8 is deeper than at the location where the first connecting portion 15 is not formed. This is because, at the location where the second connecting portion 25, which will be described later, is formed, the length of the outer peripheral wall 22 (described later) of the cover is partially longer in a direction perpendicular to the cover bottom wall 21 (described later). The bottom surface of the pocket portion 16 is the bottom surface 8c of the seal groove 8.

[0024] A through-hole 17 is formed in the pocket portion 16 of the body member 3, opening into the outer wall surface 8b of the seal groove 8. In other words, the first outer peripheral wall 6 of the body member 3 has a through-hole 17 formed in a position facing the first connecting portion 15. This through-hole 17 is used, for example, for demolding the mold for forming the first connecting portion 15. That is, one through-hole 17 is formed on each side (4 sides) of the body member 3.

[0025] As shown in Figures 4 to 6, the body member 3 has guide ribs 18 as positioning projections that guide the outer peripheral wall 22 (described later) of the cover member 4 into the seal groove 8 when the cover member 4 is assembled to the body member 3. As shown in Figures 4 to 6, the guide ribs 18 are formed on the inner wall surface 8a of the seal groove 8 so as to be continuous along the depth direction of the seal groove 8. The guide ribs 18 protrude in the width direction of the seal groove 8, and the tips that protrude into the seal groove 8 are formed to be continuously acute along the depth direction of the seal groove 8.

[0026] The upper surface of the guide rib 18 has an inclined surface 18a on the side of the seal groove 8, which increases in area while sloping toward the bottom surface 8c of the seal groove 8. This inclined surface 18a has a triangular shape when viewed from above.

[0027] Guide ribs 18 are formed in pairs on each of the four sides of the body member 3. Note that guide ribs 18 may not be formed on all four sides of the body member 3, but rather on three different sides. In other words, guide ribs 18 may be provided on multiple sides of the body member 3 when viewed from above.

[0028] The cover member 4 is made of, for example, a press-formed metal plate or a dish-shaped casting made of aluminum alloy. In plan view, the cover member 4 has a rectangular shape that is slightly smaller than the body member 3, and covers one side of the circuit board from the opposite side of the body member 3. As shown in Figures 1 to 3, the cover member 4 has a rectangular cover bottom wall 21 and a cover outer peripheral wall 22 that rises from the outer peripheral edge of the cover bottom wall 21.

[0029] The outer peripheral wall 22 of the cover has, for example, one tongue-shaped protruding wall 23 on each side of the cover member 4, corresponding to the first connecting portion 15. The protruding wall 23 corresponds to a leg that protrudes toward the seal groove bottom wall 11, and as shown in Figure 3, it is formed to protrude from the tip of the outer peripheral wall 22 of the cover toward the bottom surface 8c of the seal groove 8. That is, the cover member 4 has a protruding wall 23 at a part of the tip of the outer peripheral wall 22 of the cover that protrudes toward the bottom surface 8c of the seal groove 8 (seal groove bottom wall 11). The top surface of the seal groove bottom wall 11 is the bottom surface 8c.

[0030] The protruding wall 23 is housed in the pocket portion 16 of the body member 3 when the cover member 4 is assembled to the body member 3.

[0031] The outer peripheral wall 22 of the cover has a second connecting portion 25 formed at the position where the protruding wall 23 is formed in the circumferential direction. In other words, the cover member 4 has a second connecting portion 25 on which the outer peripheral wall 22 of the cover is provided.

[0032] The second connecting portion 25 is formed to be located within the seal groove 8 when the cover member 4 is assembled to the body member 3. In other words, the second connecting portion 25 is formed at the tip of the outer peripheral wall 22 of the cover, which will be located within the seal groove 8 when the cover member 4 is assembled to the body member 3.

[0033] In the first embodiment, the second connecting portion 25 is a through hole formed on the tip side of the outer peripheral wall 22 of the cover, into which the first connecting portion 15 can enter. In other words, in the first embodiment, the second connecting portion 25 is a recess into which the first connecting portion 15 catches. Also, in the first embodiment, the first connecting portion 15 is a projection into which the second connecting portion 25 catches. In short, the first connecting portion 15 and the second connecting portion 25 are connected by a snap fit so that the tip of the outer peripheral wall 22 of the cover does not come out of the seal groove 8.

[0034] In the first embodiment, the first connecting portion 15 and the second connecting portion 25 are connected within the seal groove 8 such that the tips of the outer peripheral wall 22 of the cover interlock with each other in the direction in which they exit the seal groove 8.

[0035] The tip of the protruding wall 23 is in a non-contact state with the bottom surface 8c of the seal groove 8 when the first connecting portion 15 and the second connecting portion 25 are connected.

[0036] Furthermore, the cover member 4 may be formed such that the tip of the protruding wall 23 is in contact with the bottom surface 8c of the seal groove 8, as shown in Figure 7, while the tip of the outer peripheral wall 22 of the cover is not in contact with the bottom surface 8c of the seal groove 8 in positions where the protruding wall 23 is not provided. Figure 7 is an enlarged view of the main part of the cross-sectional view corresponding to the position along line AA in Figure 2.

[0037] In the first embodiment, the electronic control device 1 has the first connecting portion 15 and the second connecting portion 25 connected within the seal groove 8. This allows for suppression of the expansion (bulging, protrusion) of the body member 3 and cover member 4 toward the outer circumference of the seal groove 8, and overall, the housing 2 can be made smaller.

[0038] In the first embodiment, the electronic control device 1 can hold the cover member 4 to the body member 3 by connecting the first connecting portion 15 and the second connecting portion 25 until the sealing material 10 is fixed, thus ensuring sealing stability by the sealing material 10.

[0039] In the first embodiment, the electronic control unit 1 undergoes thermal expansion when curing (thermal curing) the sealing material 10. As a result, the tip of the outer peripheral wall 22 of the cover member 4 tends to lift (separate) from the bottom wall 11 of the sealing groove 8.

[0040] However, in the first embodiment of the electronic control device 1, since the first connecting portion 15 of the body member 3 and the second connecting portion 25 of the cover member 4 are connected, the reaction force of the sealing material 10 and the thermal expansion of the body member 3 and the cover member 4 increase the bonding force between the first connecting portion 15 and the second connecting portion 25. In other words, in the first embodiment of the electronic control device 1, the reaction force of the sealing material 10 and the deformation due to thermal expansion of the body member 3 and the cover member 4 act in a direction that increases the bonding force between the first connecting portion 15 and the second connecting portion 25.

[0041] Therefore, even if the first connecting portion 15 and the second connecting portion 25 are miniaturized, the electronic control device 1 of the first embodiment can ensure sufficient connection strength when the first connecting portion 15 and the second connecting portion 25 are connected.

[0042] In the first embodiment of the electronic control device 1, since the body member 3 has a pocket portion 16, the extruded (flowed out) sealing material 10 can be received in the pocket portion 16. Therefore, in the first embodiment of the electronic control device 1, the space between the body member 3 and the cover member 4 is sealed even within the pocket portion 16, and the contact area (creepage distance) between the sealing material 10 and the body member 3 and the cover member 4 can be increased, thereby improving the sealing strength. In other words, it becomes possible to increase the shortest distance from the inside to the outside of the body member 3 at the contact surface between the body member 3 and the sealing material 10, and the shortest distance from the inside to the outside of the cover member 4 at the contact surface between the cover member 4 and the sealing material 10, thereby improving the sealing strength.

[0043] Other embodiments of the present invention will be described below. Components that overlap with those described above are denoted by the same reference numerals, and redundant descriptions are omitted.

[0044] The electronic control device 31 of the second embodiment of the present invention will be described with reference to Figures 8 and 9. Figure 8 is a front view of the electronic control device 31 according to the second embodiment of the present invention. Figure 9 is an enlarged view of the main part in the cross-sectional view along line DD in Figure 8.

[0045] The electronic control device 31 of the second embodiment has substantially the same configuration as the electronic control device 1 of the first embodiment described above, but a bottom wall through-hole 32 is formed in the bottom wall 11 of the seal groove of the body member 3, and the protruding wall 23 and the second connecting portion 25 pass through the bottom wall through-hole 32. The second connecting portion 25 is connected to the first connecting portion 15 which is formed below the seal groove 8.

[0046] In other words, the first connecting portion 15 of the second embodiment is formed below the seal groove 8. More specifically, the first connecting portion 15 of the second embodiment is formed directly below the seal groove 8. Furthermore, the first connecting portion 15 of the second embodiment is formed in a position that overlaps with the seal groove 8 when the body member 3 is viewed from above.

[0047] In the second embodiment, the second connecting portion 25 penetrates the bottom wall through hole 32 and connects to the first connecting portion 15 so that the tip of the outer peripheral wall 22 of the cover does not come out of the seal groove 8. In other words, in the second embodiment, the first connecting portion 15 and the second connecting portion 25 are connected by a snap fit directly below the seal groove 8 so that they interlock with each other in the direction in which the tip of the outer peripheral wall 22 of the cover comes out of the seal groove 8.

[0048] In the second embodiment, the first connecting portion 15 is a projection formed to protrude from the side surface of the body bottom wall 5 located below the seal groove 8 toward the outer circumference of the body member 3.

[0049] In the electronic control device 31 of the second embodiment, the body member 3 does not have a pocket portion 16, and the bottom surface 8c of the seal groove 8 is formed to be on the same plane over its entire circumference. In other words, in the electronic control device 31 of the second embodiment, the seal groove 8 is formed to the same depth over its entire circumference.

[0050] Although the shape of the electronic control device 31 in this second embodiment is more complex than that of the first embodiment due to the formation of a bottom wall through-hole 32 in the bottom wall 11 of the seal groove of the body member 3, it can achieve substantially the same effects as the electronic control device 1 of the first embodiment described above.

[0051] The electronic control device 41 of the third embodiment of the present invention will be described using Figures 10 to 13. Figure 10 is a front view of the electronic control device 41 according to the third embodiment of the present invention. Figure 11 is an enlarged view of the main part in the cross-sectional view along line EE in Figure 10. Figure 12 is a cross-sectional view corresponding to the position along line FF in Figure 1. Figure 13 is an enlarged view of section G in Figure 12.

[0052] The electronic control device 41 of the third embodiment has substantially the same configuration as the electronic control device 1 of the first embodiment described above, but the bottom wall through hole 32 formed in the bottom wall 11 of the seal groove of the body member 3 becomes the first connecting portion 15, and the second connecting portion 25 is formed at the tip of the outer peripheral wall 22 of the cover member 4.

[0053] The second connecting portion 25 of the third embodiment has a pair of first protruding pieces 42 that protrude from the tip of the outer peripheral wall 22 of the cover toward the first connecting portion 15 (bottom wall through hole 32), and a pair of second protruding pieces 43 that protrude from the tips of the pair of first protruding pieces 42.

[0054] The pair of second protruding pieces 43 are formed to protrude in opposite directions along the circumferential direction of the cover member 4.

[0055] In the third embodiment, the second connecting portion 25 is connected to the first connecting portion 15 by a pair of second protruding pieces 43 that catch on the opening edge of the first connecting portion 15 (bottom wall through hole 32). In other words, in the third embodiment, the first connecting portion 15 and the second connecting portion 25 are connected by a snap fit such that the tip of the outer peripheral wall 22 of the cover catches on each other in the direction in which it exits the seal groove 8.

[0056] In this third embodiment, the pocket portion 16 is set to cover the connecting portion between the first connecting portion 15 and the second connecting portion 25.

[0057] The electronic control device 41 of this third embodiment can achieve substantially the same effects as the electronic control device 1 of the first embodiment described above.

[0058] Furthermore, the electronic control device 41 of the third embodiment, compared to the electronic control device 31 of the second embodiment described above, is structurally able to reduce the size of the first connecting portion 15 (bottom wall through-hole 32). As a result, the electronic control device 41 of the third embodiment, compared to the electronic control device 31 of the second embodiment, relatively reduces the amount of sealing material 10 flowing out of the sealing groove 8 through the first connecting portion 15 (bottom wall through-hole 32), and relatively improves the sealing strength within the sealing groove.

[0059] The electronic control device 51 of the fourth embodiment of the present invention will be described with reference to Figures 14 and 15. Figure 14 is a front view of the electronic control device 51 according to the fourth embodiment of the present invention. Figure 15 is an enlarged view of the main part in the cross-sectional view along line HH in Figure 14.

[0060] The electronic control device 51 of the fourth embodiment has substantially the same configuration as the electronic control device 1 of the first embodiment described above, but the first connecting portion 15 is a recess formed in the inner wall surface 8a of the seal groove 8, and the second connecting portion 25 is a protruding portion formed by bending a part of the tip of the outer peripheral wall 22 of the cover toward the inside (inner circumference) of the cover member 4. The second connecting portion 25 of the fourth embodiment is formed by bending a part of the tip of the outer peripheral wall 22 of the cover toward the inner wall surface 8a of the seal groove 8 so that it catches on the recess which is the first connecting portion 15. In other words, the second connecting portion 25 of the fourth embodiment is formed by bending the protruding wall 23 toward the inner wall surface 8a of the seal groove 8.

[0061] In the fourth embodiment, the second connecting portion 25 is connected to the first connecting portion 15 by hooking onto it. In other words, in the fourth embodiment, the first connecting portion 15 and the second connecting portion 25 are connected by a snap fit such that the tip of the outer peripheral wall 22 of the cover hooks onto each other in the direction in which it exits the seal groove 8.

[0062] In the electronic control device 51 of the fourth embodiment, the body member 3 does not have a pocket portion 16, and the bottom surface 8c of the seal groove 8 is formed to be on the same plane over its entire circumference. In other words, in the electronic control device 51 of the fourth embodiment, the seal groove 8 is formed to the same depth over its entire circumference.

[0063] The electronic control device 51 of this fourth embodiment can achieve substantially the same effects as the electronic control device 1 of the first embodiment described above.

[0064] Furthermore, the electronic control device 51 of the fourth embodiment allows for a simplified shape of the second connecting portion 25 of the cover member 4.

[0065] In addition, in the fourth embodiment, the electronic control device 51 may be formed such that the length of the outer peripheral wall 22 of the cover is partially extended in a direction perpendicular to the bottom wall 21 of the cover at the position where the second connecting portion 25 is formed, and a pocket portion 16 is formed at the position where the first connecting portion 15 is formed.

[0066] Although specific embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention.

[0067] For example, in each of the embodiments described above, the body member 3 may be provided with a guide rib 18 at the position where the first connecting portion 15 is provided.

[0068] For example, in the first and second embodiments described above, the second connecting portion 25 may be a recess into which the first connecting portion 15 catches, rather than a through hole.

Claims

1. It has a housing that contains a circuit board on which electronic components are mounted, The above-mentioned housing comprises a first housing that covers one side of the circuit board and a second housing that covers one side of the circuit board from the opposite side of the first housing. The first housing has a seal groove located outside the housing position of the circuit board and filled with a sealing material, and a first connecting portion provided within the seal groove. The second housing has an outer peripheral wall whose tip is inserted into the seal groove, and a second connecting portion provided on the outer peripheral wall, The first connecting portion described above is a projection that protrudes from the side wall of the seal groove toward the outer circumference of the first housing, The second connecting portion is a recess into which the projection catches, and is connected to the first connecting portion so that the tip of the outer peripheral wall does not come out of the seal groove within the seal groove. The second housing described above has a leg portion at a part of the tip of the outer peripheral wall that protrudes toward the bottom wall of the seal groove, and the leg portion contacts the bottom wall of the seal groove, so that the tip of the outer peripheral wall where the leg portion is not provided is in a non-contact state with the bottom wall of the seal groove.

2. It has a housing that contains a circuit board on which electronic components are mounted, The above-mentioned housing comprises a first housing that covers one side of the circuit board and a second housing that covers one side of the circuit board from the opposite side of the first housing. The first housing has a seal groove located outside the housing position of the circuit board and filled with a sealing material, and a first connecting portion formed below the seal groove, The second housing has an outer peripheral wall whose tip is inserted into the seal groove, and a second connecting portion provided on the outer peripheral wall, The electronic control device is characterized in that the second connecting portion penetrates a bottom wall through-hole formed in the bottom wall of the seal groove and is connected to the first connecting portion such that the tip of the outer peripheral wall does not come out of the seal groove.

3. The electronic control device according to claim 1, characterized in that the first housing has a bag-shaped pocket capable of accommodating the second connecting portion.

4. The first connecting portion is a projection that protrudes from the first housing toward the outer periphery of the first housing, The electronic control device according to claim 2, characterized in that the second connecting portion is a recess into which the projection catches.

5. The electronic control device according to claim 1 or 2, characterized in that the second connecting portion is connected to the first connecting portion by a snap fit.

6. The first connecting portion described above is the bottom wall through hole formed in the bottom wall of the seal groove, The second connecting portion has a pair of first protruding pieces that project from the tip of the outer peripheral wall of the second housing toward the bottom wall through hole, and a pair of second protruding pieces that project from the tips of the pair of first protruding pieces. The pair of second protruding pieces described above are formed to protrude in opposite directions from one another in the circumferential direction of the housing, The electronic control device according to claim 2, characterized in that the second connecting portion is connected to the first connecting portion by the pair of second protruding pieces catching on the opening edge of the bottom wall through hole.

7. The first connecting portion described above is a recess formed in the side wall of the seal groove, The electronic control device according to claim 1, characterized in that the second connecting portion is a protruding portion formed by bending a part of the tip of the outer peripheral wall of the second housing toward the side wall on the side where the recess of the seal groove is formed, so as to catch on the recess.

8. The electronic control device according to claim 1 or 2, characterized in that a positioning projection is formed on the side wall of the seal groove, along the depth direction of the seal groove, and the tip protruding into the seal groove is sharp-angled.

9. The above enclosure has a rectangular parallelepiped shape, The electronic control device according to claim 8, characterized in that the positioning protrusions are provided on three different sides of the first housing in a plan view of the first housing.

10. The electronic control device according to claim 8, characterized in that the upper surface of the positioning projection has an inclined surface on the seal groove side that increases in area while being inclined toward the bottom wall side of the seal groove.

11. The electronic control device according to claim 8, characterized in that the positioning projection is provided at the position where the first connecting portion is provided.

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