Electronic control device, assembly method for electronic control device, and connector

Abstract

To provide an electronic control device, an assembly method for the electronic control device, and a connector that can structurally prevent moisture from entering and can suppress the occurrence of leak defects due to a lack of sealing material.SOLUTION: An electronic control device 1 according to an embodiment includes a housing 5 that houses a circuit board 3 and a connector 4. The connector 4 includes a groove-shaped first seal portion 15 that fits into a lid-side protrusion 16 provided on a lid body 6, a protruding second seal portion 17 that fits into a box-side groove 18 provided on a box body 7, and an arm portion 19 that extends the first seal portion 15 rearward beyond the connection position with the second seal portion 17. The second seal portion 17 is connected to the back side of the first seal portion 15, and seal materials 10 are interposed between the first seal portion 15 and the lid body 6, between the second seal portion 17 and the box body 7, and between the arm portion 19 and an arm receiving portion 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an electronic control device, an assembling method for an electronic control device, and a connector. [Background technology]

[0002] Conventionally, there has been known an electronic control device in which a board on which electronic components are mounted is housed in a housing, and a connector connected to the board is partially exposed so that it can be connected to an external connector, as described in Patent Document 1. Such an electronic control device prevents moisture from entering the housing by interposing a sealant between the periphery of the connector, the lid, and the box. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4222571 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, since electronic control devices are expected to be installed in places such as the engine compartment of a vehicle, it is necessary to reliably prevent moisture from entering and to prevent leaks due to insufficient sealing material.

[0005] The present disclosure has been made in consideration of the above circumstances, and its purpose is to provide an electronic control device, an assembling method for an electronic control device, and a connector that can structurally prevent moisture from entering and suppress the occurrence of leak defects due to insufficient sealing material. [Means for solving the problem]

[0006] An electronic control device according to one embodiment of the present disclosure comprises a board on which electronic components are mounted, a connector connected to the board, and a housing having a lid body and a box body, exposing a portion of the connector to the outside while accommodating the remaining portion of the connector and the board inside, wherein the connector has a first seal portion formed in a groove shape that fits into a lid-side protrusion provided on the lid body, a second seal portion formed in a protrusion shape that fits into a box-side groove provided on the box body and connected to the back side of the first seal portion, and an arm portion that extends the first seal portion rearward beyond the connection position with the second seal portion, and the box body has an arm receiving portion that receives the arm portion when the connector is assembled, and sealing material is interposed between the first seal portion and the lid body, between the second seal portion and the box body, and between the arm portion and the arm receiving portion. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating a configuration of an electronic control device according to an embodiment. [Figure 2] Schematic diagram of the connector configuration [Figure 3] FIG. 1 is a diagram showing a schematic configuration of a lid body; [Figure 4] A diagram showing the structure of the box [Figure 5] FIG. 5 is an enlarged view of the V region in FIG. 4, showing a schematic configuration of the arm receiving portion. [Figure 6] 6 is a diagram schematically showing a cross section taken along lines L1 to L4 in FIG. 5; [Figure 7] A diagram explaining the workflow for assembling an electronic control unit [Figure 8] Diagram 1 showing the assembly of the electronic control device [Figure 9] Diagram 2 showing the assembly of the electronic control unit [Figure 10] FIG. 10 is a diagram showing a schematic view of the inclination of the connector; DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment will be described with reference to the drawings. As shown in a side view in Fig. 1, an electronic control device 1 according to this embodiment includes a board 3 on which electronic components 2 are mounted, a connector 4 connected to the board 3, and a housing 5 that exposes a portion of the connector 4 to the outside and houses the remaining portion of the connector 4 and the board 3. The housing 5 has a cover 6 and a box 7, and by assembling the cover 6 and the box 7, an internal space 8 that houses the board 3 and a portion of the connector 4, and an opening 9 for exposing the connector 4, as shown in a perspective view, are formed.

[0009] In the following description, the side of the housing 5 on which the connector 4 is exposed will be referred to as the front, the opposite side as the back, the lid 6 side as the top, and the box 7 side as the bottom. Note that the shapes and sizes of the board 3, connector 4, and housing 5 shown in Figure 1 etc. are merely examples and are not intended to be limiting. In addition, the connector 4 is not shown in the perspective view.

[0010] The housing 5 is provided with a sealant 10 between the lid 6 and the box 7, and between the connector 4 and the lid 6 and the box 7 at the opening 9. This sealant 10 may be a liquid adhesive type whose main component is silicone rubber or butyl rubber, for example. However, the components of the sealant 10 are not limited to these. By providing the sealant 10 in gaps in this manner, water is prevented from entering the housing 5.

[0011] 2, the connector 4 has a plurality of terminals 11 electrically connected to the circuit pattern formed on the substrate 3, and a housing 12 that holds some portions of the terminals 11 in a watertight manner. The housing 12 is formed of, for example, an insulating material, and holds the terminals 11 in a watertight manner. Note that the number and arrangement of the terminals 11 and the shape of the housing 12 are merely examples and are not limited to these.

[0012] As shown in a top view in Figure 2, the connector 4 has a groove-shaped first seal portion 15 sandwiched between an outer wall 13 and an inner wall 14. The first seal portion 15 extends in the left-right direction of the housing 12, and extends rearward from both the left and right ends. As will be described later, the first seal portion 15 fits into a lid-side protrusion 16 (see Figure 3) provided on the lid body 6.

[0013] 2 as viewed from the front and bottom, and also as shown in FIG. 1, connector 4 has second seal portions 17 that protrude outward from the surface of housing 12 and are provided on the bottom and both left and right side surfaces of housing 12. Second seal portion 17 is connected to the back surface of first seal portion 15 in a direction generally perpendicular to first seal portion 15. Second seal portion 17 is not directly connected to first seal portion 15, but is connected to the bottom surface of the portion forming first seal portion 15. Second seal portion 17 fits into box groove portion 18 (see FIG. 4) provided in box body 7 that forms the periphery of opening 9, as will be described later.

[0014] Furthermore, the connector 4 has arm portions 19 on the left and right side surfaces of the housing 12, which extend rearward on the opposite side from the opening 9. As shown in Fig. 5 described below, the arm portions 19 are groove-shaped between the outer wall 13 and the inner wall 14, and have a so-called split shape that resembles a divided pipe, and essentially extend the first seal portion 15 rearward.

[0015] In this embodiment, the arm portion 19 extends the first seal portion 15 rearward beyond the connection position with the second seal portion 17. Therefore, the second seal portion 17 is connected to the underside of the arm portion 19, and is therefore connected to the rear surface of the first seal portion 15. The rear end of the arm portion 19 is formed in a stepped shape with different positions in the front-rear direction in the left-right direction in the figure. The arm portion 19 is housed in an arm receiving portion 22 (see FIG. 4) provided on the box body 7, as will be described later.

[0016] The lid body 6 is formed in a generally flat plate shape as shown in a side view in Fig. 3. As shown in a bottom view, the lid body 6 has a protrusion projecting from the bottom surface, and has a lid-side protrusion 16 that surrounds the outer edge of the bottom surface. The lid body 6 is provided with a screw hole 6a at a predetermined fixing position for fixing to the box body 7, and a portion of the lid-side protrusion 16 is curved to avoid the screw hole 6a. The screw hole 6a may be a cast hole if the lid body 6 is formed by die-casting, or may be a punched hole if the lid body 6 is formed from a steel plate.

[0017] The portion of this lid-side protrusion 16 that is forward of the boundary position (P) indicated by the dashed line fits into the first seal portion 15, and the portion that is rearward of the boundary position (P) fits into an upper end groove portion 20 (see FIG. 4) provided in the box body 7. Note that the shape of the lid-side protrusion 16 and the position of the screw hole 6a provided in the lid body 6 are merely examples and are not limited to these.

[0018] As shown in top and side views in Fig. 4, the box 7 is generally rectangular parallelepiped-shaped and is formed with an opening on the top surface facing the lid 6 and the front surface on which the connector 4 is disposed. A groove-shaped box-side groove 18 that engages with the second seal 17 is provided on the front surface of the box 7 along the periphery of the opening 9. Note that, although the present embodiment illustrates a configuration in which the side surfaces of the box 7 are generally aligned in the vertical direction and the housing 5 is generally formed in a rectangular parallelepiped shape as a whole, the box 7 may also be configured such that the side surfaces are inclined downward and the housing 5 is formed into a truncated quadrangular pyramid in which the top surface is larger than the bottom surface.

[0019] The box 7 has groove-shaped upper grooves 20 formed at the upper end of each wall portion to fit over the lid protrusions 16. The upper grooves 20 are shaped to correspond to the lid protrusions 16, e.g., curved in part to avoid the screw holes 7a, and are formed to frame the outer edge of the box 7. In this embodiment, the screw holes 7a of the box 7 are internally threaded and fastened with screws that penetrate the lid 6. Note that the screw holes 7a can also be formed as through holes and fastened with screws and nuts. The upper grooves 20 can also be shaped to frame the outer edge of the box 7 when not curved.

[0020] An arm receiving portion 22 is provided at the front end of the upper groove 20 to accommodate the arm 19 when the connector 4 is assembled. As shown in the plan view of FIG. 5 , the inner surface of the outer wall 23 that forms the upper groove 20 is slightly expanded outward, making the arm receiving portion 22 wider than the upper groove 20. In this case, the arm receiving portion 22 is sized so that the outer wall 13 and the outer wall 23 are generally flush with each other, and the inner wall 14 and the inner wall 24 are also generally flush with each other. Therefore, in a plan view, the arm receiving portion 22 connects the first seal portion 15 and the upper groove 20 in a generally linear manner. The arm receiving portion 22 on the left side of the housing 5 is formed in a symmetrical shape.

[0021] 4, the arm receiving portion 22 is sized so that its bottom surface is positioned lower than the bottom surface of the upper groove portion 20. Therefore, as shown as the L1 cross section in FIG. 6, a step is formed between the bottom surface of the arm receiving portion 22 and the bottom surface of the upper groove portion 20 in the cross section taken along line L1. This step is formed to a size roughly equal to the thickness of the arm portion 19, and as shown as the L1 assembled cross section in FIG. 6, when the arm portion 19 is housed, the bottom surface of the first seal portion 15 and the bottom surface of the upper groove portion 20 are roughly at the same height.

[0022] As a result, in the arm receiving portion 22, the first seal portion 15 and the upper end groove portion 20 are generally connected even in a cross-sectional view. In this way, the first seal portion 15 and the upper end groove portion 20 are generally continuous in a plan view and a cross-sectional view, so that a continuous filling path for the sealant 10 is formed at the upper end of the box body 7 that faces the lid body 6. In other words, it is possible to interpose the sealant 10 seamlessly between the lid body 6 and the connector 4 / box body 7.

[0023] 6, the sealing material 10 is not shown, but is applied to the first seal portion 15, the upper end groove portion 20, the arm receiving portion 22, and the box side groove portion 18. Therefore, the space (S1) between the connector 4 and the lid body 6, and the space (S2) between the connector 4 and the box body 7 at the arm receiving portion 22 are filled with the sealing material 10, and the arm portion 19 is sandwiched between the sealing material 10 from above and below as viewed in the figure.

[0024] 5, the front end of the upper groove 20 is formed in a stepped shape with different positions in the front-rear direction in the left-right direction of the figure. Therefore, as shown in the assembled plan view that schematically illustrates the state in which the connector 4 is assembled to the box body 7, when the arm 19 is housed, the rear end of the arm 19 and the front end of the upper groove 20 are nested within each other. In this case, water that has entered from the right side in the figure, for example, must travel through the gap between the arm 19 and the upper groove 20 to enter the interior of the housing 5. However, because the gap is stepped, the gap in the plan view becomes a so-called labyrinth structure, making it possible to structurally suppress water intrusion.

[0025] 6 shows the shapes of the arm portion 19 and the arm receiving portion 22 as viewed from the L1 to L4 cross sections. If water enters from the right side of the drawing and then enters the interior of the housing 5 on the left side of the drawing, it must travel along the bottom surface of the arm receiving portion 22. In this case, the water intrusion path has a so-called labyrinth structure even in the cross section. As a result, it is possible to make the so-called leak path longer. The leak path corresponds to the actual path length traveled by water entering the housing 5 at a position where there is a gap between components.

[0026] That is, the electronic control device 1 is capable of structurally suppressing water intrusion by providing the arm portion 19 and the arm receiving portion 22. Note that the L1 cross section is a cross section forward of the second seal portion 17, and therefore water does not enter the internal space 8 of the housing 5 at this L1 cross section position, and the positions where water may enter the internal space 8 are behind the second seal portion 17, such as the positions in the L2 to L4 cross sections.

[0027] Additionally, water is prevented from entering the housing 5 from the front by the second seal portion 17, the box side groove portion 18, and the sealant 10 applied thereto. As shown in Figures 4 and 5, the box side groove portion 18 is formed in the shape of a groove sandwiched between the front wall 25 and the rear wall 26, and is provided so as to frame the opening 9 on the box body 7 side.

[0028] At this time, when assembling the connector 4 to the box body 7, it is necessary to insert the second seal portion 17 from above into the box groove portion 18 and fit it. However, if the second seal portion 17 is inserted into the box groove portion 18 from above, the seal material 10 applied to the box groove portion 18 will be pressed down by the second seal portion 17, and there is a risk that the seal material 10 on the upper end side of the box groove portion 18 will be insufficient.

[0029] Therefore, in this embodiment, a structure is adopted in which the box-side groove portion 18 is connected to the arm receiving portion 22, and the second seal portion 17 is connected to the back surface of the first seal portion 15 within the arm receiving portion 22. Below, we will explain the operation and effect of this structure, along with the assembly method of the electronic control device 1. Note that the connector 4 is connected to the board 3, and the combination of the connector 4 and the board 3 will be referred to as a board assembly for convenience.

[0030] As shown in Fig. 7, when assembling the electronic control device 1, the sealant 10 is applied to the box groove 18 of the box body 7 (S1), and also to the arm receiving portion 22 (S2). As a result, as shown after step S2 in Fig. 8, the sealant 10 is filled in the area where the connector 4 is to be disposed. Note that steps S1 and S2 can be performed in any order, and step S5, which will be described later, may also be performed at this point.

[0031] Next, the substrate assembly is assembled into the box body 7 (S3). At this time, as shown in Fig. 8 as step S3, the second seal portion 17 is inserted into the box groove portion 18 from above and fitted thereto, so if the seal material 10 in the region (X) at the upper end of the box groove portion 18 is pressed downward by the second seal portion 17, there is a risk that the seal material 10 in the region (X) will be insufficient.

[0032] In contrast, in this embodiment, because the box groove 18 is connected to the arm receiver 22, the sealing material 10 can be replenished from the arm receiver 22 to the region (X) where the sealing material 10 is insufficient, as shown by the arrow F after step S3. At this time, because the arm 19 is accommodated in the arm receiver 22 from above, the box groove 18 serves as an escape route for the sealing material 10 pressed by the arm 19. As a result, the pressed sealing material 10 moves toward the box groove 18, making it possible to efficiently replenish the sealing material 10 in the box groove 18. In other words, the assembly method of this embodiment also contributes to resolving any shortage of sealing material 10.

[0033] In this embodiment, the protrusion amount of the second seal portion 17 is set so that it does not extend beyond the outer edge of the arm portion 19, as shown in Figures 5 and 6. As a result, the box side groove portion 18 is within the range of the bottom surface of the arm portion 19, and the seal material 10 pushed out by the arm portion 19 first heads toward the region (X).

[0034] 6, the extruded sealing material 10 spreads and fills the side surface of the arm portion 19, generally up to the upper ends of the box body 7 and the arm portion 19. As a result, the sealing material 10 that prevents water from entering from the front along the box-side groove portion 18 is interposed between the connector 4 and the box body 7 so as to border the opening 9.

[0035] Next, the sealant 10 is applied to the first seal portion 15 (S4), and also to the upper end groove portion 20 (S5). As a result, as shown in FIG. 8 after step S5, the sealant 10 is filled between the first seal portion 15 and the box body 7 and the lid body 6, and the sealant 10 that prevents water from entering between the box body 7 and the lid body 6 is interposed so as to frame the outer edges of the first seal portion 15 and the box body 7.

[0036] Then, after assembling the lid body 6 while fitting the lid-side protrusion 16 into the first seal portion 15 and the upper end groove portion 20 (S6), the lid body 6 and the box body 7 are screwed together (S7). As a result, as shown in Fig. 8 after step S7 and as shown in a perspective view in Fig. 1, the electronic control device 1 is assembled in a state in which the sealant 10 that prevents water from entering through the opening 9 and the sealant 10 that prevents water from entering between the lid body 6 are interposed. Note that the screws are not shown in the drawing.

[0037] In this way, the electronic control device 1 is structurally designed to be water-resistant, and it is possible to prevent a shortage of sealing material 10 during assembly.Furthermore, the assembly can be carried out in a simple procedure in which each component is basically assembled in order from above.

[0038] According to the embodiment described above, the following effects can be obtained. The electronic control device 1 according to the embodiment includes a board 3 on which an electronic component 2 is mounted, a connector 4 connected to the board 3, and a housing 5 having a cover 6 and a box 7, which houses the board 3 and a portion of the connector 4 exposed to the outside. The connector 4 includes a first seal portion 15 formed in a groove that fits into a cover-side protrusion 16 provided on the cover 6, a second seal portion 17 formed in a protrusion that fits into a box-side groove 18 provided on the box 7 and connected to the back side of the first seal portion 15, and an arm portion 19 extending from the first seal portion 15 to a position rearward beyond the connection position with the second seal portion 17. The box 7 also includes an arm receiving portion 22 that receives the arm portion 19 when the connector 4 is assembled. Sealants 10 are interposed between the first seal portion 15 and the cover 6, between the second seal portion 17 and the box 7, and between the arm portion 19 and the arm receiving portion 22.

[0039] With this configuration, the electronic control device 1 is structurally less susceptible to moisture intrusion into the housing 5, and can be assembled with the sealant 10 applied in the appropriate amount to the appropriate locations. Therefore, the electronic control device 1 can structurally prevent moisture intrusion and suppress the occurrence of leak defects due to insufficient sealant 10. Furthermore, the electronic control device 1 can be assembled basically by a simple procedure of assembling each component in order from above.

[0040] Furthermore, in the electronic control device 1, the box-side groove portion 18 is connected to the arm receiving portion 22, the second seal portion 17 is connected to the back surface of the first seal portion 15 within the arm receiving portion 22, and the arm portion 19 is sandwiched between the lid body 6 and the arm receiving portion 22 and by the seal material 10 interposed between the lid body 6 and the arm portion 19. As a result, the arm portion 19, which is formed separately from the lid body 6 and the box body 7 and has a gap between it and the lid body 6 and the box body 7, is covered from above and below by the seal material 10, thereby preventing moisture from entering.

[0041] Furthermore, the rear end of the arm portion 19 of the electronic control device 1 is formed in a half-split shape. This allows the sealing material 10 to be filled on the upper surface of the arm portion 19, and a sufficient amount of sealing material 10 can be interposed between the arm portion 19 and the cover 6. Furthermore, the rear end of the arm portion 19 of the electronic control device 1 is formed in a stepped shape, which allows the path for moisture to enter to have a labyrinth structure in plan view, thereby making it possible to suppress the intrusion of moisture.

[0042] Furthermore, electronic control device 1 has groove-shaped upper end groove 20 formed at the upper end of the wall of box 7 facing lid 6, which fits into lid-side protrusion 16, and arm 19 extends to connect first seal 15 to upper end groove 20. As a result, when connector 4 is attached, sealant 10 can be interposed along the outer edge of housing 5 between connector 4 and box 7 and lid 6, preventing water from entering the interior of housing 5.

[0043] Furthermore, a method for assembling the electronic control device 1 configured as described above includes the steps of applying sealant 10 to box groove 18 of box 7, assembling connector 4 to box 7 while fitting second seal 17 into box groove 18, applying sealant 10 to first seal 15, applying sealant 10 to a portion of box 7 facing lid 6, and assembling lid 6 to connector 4 and box 7 while fitting lid protrusion 16 into first seal 15. This allows each component to be easily assembled while preventing moisture from entering using sealant 10.

[0044] The connector 4 also includes a plurality of terminals 11 connected to a board 3 on which the electronic components 2 are mounted, a housing 12 that holds portions of the terminals 11, a groove-shaped first seal portion 15 that fits into a lid-side protrusion 16 provided on a lid body 6 that forms the housing 5 of the electronic control device 1, a protruding second seal portion 17 that fits into a box-side groove 18 provided on a box body 7 that forms the housing 5 of the electronic control device 1 and is connected to the back side of the first seal portion 15, and an arm portion 19 that extends the first seal portion 15 rearward beyond the connection position with the second seal portion 17. This structurally prevents intrusion into the housing 5 and also makes assembly easier.

[0045] In the embodiment, the rear end of arm portion 19 is shaped to generally coincide with the rear end of housing 12, but arm portion 19 may be shaped so that its rear end extends further rearward than the rear end of housing 12. In this case, as shown in a side view in Figure 10, arm portion 19 may be shaped so that its rear end extends to the vicinity of screw hole 6a, for example.

[0046] For example, when connecting external connector 30, it is assumed that connector 4 is scooped up and down as indicated by arrow R. There is a predetermined gap (D) between arm portion 19 and arm receiving portion 22. Therefore, when connector 4 is scooped up and down, connector 4 rotates around a certain rotation axis (J) and the rear end of arm portion 19 comes into contact with arm receiving portion 22. At this time, as shown as an example of a short length in FIG. 10 , in a situation where arm portion 19 is relatively short, connector 4 is tilted at a certain angle (α) and the rear end of arm portion 19 comes into contact with arm receiving portion 22.

[0047] In contrast, when arm portion 19 is relatively long, as shown in the long example in Figure 10, the displacement of the rear end of arm portion 19 is relatively small, and therefore the angle (β) at which connector 4 is tilted is smaller than the angle (α) in the short axis example. In other words, the further rearward the rear end of arm portion 19 is positioned, the smaller the tilt of connector 4 becomes. Therefore, by positioning the rear end of arm portion 19 rearward of the rear end of housing 12, the tilt of connector 4 when connector 4 is gouged can be reduced. In this case, the rear end of arm portion 19 can be made long rearward to the extent that it does not interfere with other structures, such as screw hole 6a.

[0048] Although the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments or structures. The present disclosure also encompasses various modifications and modifications within the scope of equivalents. In addition, various combinations and forms, as well as other combinations and forms including only one element, more than one element, or less than one element, are also within the scope and spirit of the present disclosure. [Explanation of symbols]

[0049] In the drawings, 1 is an electronic control device, 2 is an electronic component, 3 is a circuit board, 4 is a connector, 5 is a housing, 6 is a lid body, 7 is a box body, 9 is an opening, 10 is a sealing material, 11 is a terminal, 12 is a housing, 15 is a first seal portion, 16 is a protrusion on the lid side, 17 is a second seal portion, 18 is a groove portion on the box side, 19 is an arm portion, 20 is an upper end groove portion, and 22 is an arm receiving portion.

Claims

1. a substrate on which electronic components are mounted; a connector connected to the substrate; a housing having a lid and a box, exposing a portion of the connector to the outside and accommodating the remaining portion of the connector and the board therein; The connector has a first seal portion formed in a groove shape that fits into a lid-side protrusion provided on the lid body, a second seal portion formed in a protrusion shape that fits into a box-side groove provided on the box body and connected to the back side of the first seal portion, and an arm portion that extends the first seal portion rearward beyond a connection position with the second seal portion, the box body has an arm receiving portion that receives the arm portion when the connector is assembled, An electronic control device in which sealing materials are interposed between the first seal portion and the lid body, between the second seal portion and the box body, and between the arm portion and the arm receiving portion.

2. The box groove portion is connected to the arm receiving portion, the second seal portion is connected to a rear surface of the first seal portion within the arm receiving portion, 2. The electronic control device according to claim 1, wherein the arm portion is sandwiched between the cover body and the arm receiving portion and by the sealing material interposed between the arm portion and the cover body and the arm receiving portion.

3. 2. The electronic control device according to claim 1, wherein the rear end of the arm portion is formed in a half-split shape.

4. 2. The electronic control device according to claim 1, wherein the rear end of the arm portion is formed in a stepped shape.

5. The box has a wall portion facing the lid, and an upper end groove portion is formed at the upper end of the wall portion facing the lid, the upper end groove portion being fitted with the lid-side protrusion, The electronic control device according to claim 1 , wherein the arm portion extends so as to connect the first seal portion to the upper end groove portion.

6. The box has a wall portion facing the lid, and an upper end groove portion is formed at the upper end of the wall portion facing the lid, the upper end groove portion being fitted with the lid-side protrusion, 2. The electronic control device according to claim 1, wherein the rear end of the arm portion, which faces the upper groove portion, extends rearward beyond the rear end of the housing of the connector.

7. A method for assembling an electronic control device including a housing having a substrate on which electronic components are mounted, a connector connected to the substrate, a cover, and a box, the housing exposing a portion of the connector to the outside and accommodating the remaining portion of the connector and the substrate, The connector has a first seal portion formed in a groove shape that fits into a lid-side protrusion provided on the lid body, a second seal portion formed in a protrusion shape that fits into a box-side groove provided on the periphery of the opening of the housing and connected to the back side of the first seal portion, and an arm portion that extends the first seal portion rearward beyond the connection position with the second seal portion, the box body has an arm receiving portion that receives the arm portion when the connector is assembled, applying a sealant to the box groove portion of the box body; assembling the connector to the box body while fitting the second seal portion to the box groove; applying a sealant to the first seal portion; applying a sealant to a portion of the box body facing the lid body; assembling the lid body to the connector and the box body while fitting the lid-side protrusion to the first seal portion; A method for assembling an electronic control device, comprising:

8. a plurality of terminals connected to a substrate on which electronic components are mounted; a housing for holding a portion of the terminal; a first seal portion formed in a groove shape and fitted with a lid-side protrusion provided on a lid body forming a housing of the electronic control device; a second seal portion that is formed in a protruding shape and that fits into a box groove portion provided in a box body that forms the housing of the electronic control device, and that is connected to the back side of the first seal portion; an arm portion extending the first seal portion rearward beyond a connection position with the second seal portion; A connector comprising:

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