JP6652312B1 - Electronic control unit - Google Patents

Abstract

The present invention provides an electronic control device capable of improving the sealing performance of an annular seal formed at an outer peripheral position of a case and an outer peripheral position of a cover. An annular seal portion (600A) formed at an outer peripheral position of a case (200A) and an outer peripheral position of a cover (300A) includes a case-side annular seal surface (210), a cover-side annular seal surface (310). An annular sealing material (610) filled between the case-side annular sealing surface (210) and the cover-side annular sealing surface (310), and the case-side annular sealing surface (210) or the cover-side annular sealing surface ( 310), a case-side step (211A) or a cover-side step (311A) having a step size Δh protruding from the case-side annular seal surface (210) or the cover-side annular seal surface (310) to the convex side. ), The sealing surface opposed by the case-side step portion (211A) or the cover-side step portion (311A) is an annular seal portion (600A) that is engaged and fastened in a bent radial shape with a step size Δh. It has a closed structure. [Selection diagram] FIG.

Description

  TECHNICAL FIELD The present application relates to an electronic control device in which a circuit board is housed in a closed casing formed by a case and a cover.

  A sealed housing united and integrated by a case and a cover for accommodating a circuit board needs a waterproof function to protect the circuit board accommodated therein. A waterproof sealing material is filled in a joint portion of a plurality of sides of an outer peripheral position (peripheral edge) of the case and the cover to be integrated, and an intersection of the sides is integrally fastened by a fastening-related member as a fastening portion, and a liquid or the like is sealed. A waterproof structure is formed to prevent intrusion into the body.

  When the electronic control unit is assembled in a factory, the pressure inside and outside the sealed enclosure of the electronic control unit is the same, but when it is transported by air, or in a high altitude environment, the surrounding environment is lower than the assembled environment. In a situation where the temperature is rising and the electronic control unit operates and heat is generated from the electronic components, the pressure inside the sealed casing increases, and the pressure difference between the inside and outside of the sealed casing increases, and A force from the inside due to this pressure difference acts on the case and the cover that constitute it, and a tensile force also acts on the sealing material filled by the force that tries to open the sealing surface at the joint between the peripheral case and the cover. It will be.

  As described above, the pressure difference between the inside and outside of the closed casing is assumed to cause a large pressure difference when the inside pressure is higher than the outside pressure. is necessary.

  Conventionally, the sealing structure of the joint portion of the case and the cover that resists the pressure from the inside of the closed casing is formed by inserting a tongue-like ridge provided on the cover side into a groove provided on the outer peripheral edge of the case, and forming the groove. The seal structure is filled with a sealing material in the gap between the ridge and the ridge, and the sealing structure is waterproof. The adhesive surface of the sealing material holds the force to open the mating part of the sealed housing with the shear strength, and the adhesive strength is increased by increasing the contact surface with the sealing material to secure the adhesive strength. There is a problem that the waterproof structure to be ensured has a complicated structure in which the sealing structure of the mating portion is uneven, and the amount of the sealing material is large.

  To solve this problem, according to Patent Document 1, the following is described as a solution to provide an electronic control device having a small size and sufficient adhesive strength.

  A groove is provided at an end (outer peripheral flange) of the case body, and the groove is filled with an adhesive (sealant), and the cover has a cover flat portion adhered to the adhesive (sealant) in the groove. A seal having a stepped portion around the outer periphery of the groove, the cover flat portion and the stepped portion being brought into contact with each other, and the cover flat portion having a planar structure adhered to the sealing material filled in the groove in a planar manner. A structure has been proposed.

  Further, according to FIG. 4 of Patent Document 1, there is proposed a structure of a seal portion in which a protrusion that engages with a cover flat portion is provided on the step portion. In the paragraph [0012] of Patent Document 1, since the cover is provided with a flat portion that comes into contact with the adhesive, it is possible to maintain the adhesive strength between the case body and the cover with tensile strength, and the adhesive portion is It is said that sufficient adhesive strength can be obtained without increasing the size.

  Further, according to Patent Literature 2, the seal cross-sectional structure of each part of the side having the fastening and fixing portion between the case body and the cover as an end point is such that the seal cross-sectional area at the end of the side is reduced while ensuring waterproofness. An electronic control device of a housing structure characterized by having a structure of a sealing surface smaller than a cross-sectional area at a central portion. In the bonding surface width W and the bonding thickness G forming a sealing cross section, the bonding surface width W When the distance is fixed, the seal cross-sectional area at the end of the fixed point is smaller than the seal cross-sectional area at the center of the side remote from the fixed point.

Patent No. 5500681 (FIGS. 2 and 4, paragraphs [0007] and [0012]) Patent No. 6379204 (FIG. 6, paragraphs [0008], [0009], [0048])

  The sealed housing constructed by fastening the case and the cover changes the environment in which the product is used as an environment, which is built by applying an annular sealing material, and the internal pressure of the sealed housing in the operating environment is closed. When the pressure is higher than that of the outside of the housing, a pressure difference between the inside and outside of the closed housing causes a force in the direction of opening the joint between the case and the cover to act from inside the closed housing. Due to this force, the displacement of the members constituting the closed casing becomes largest at the center of the side having the fastening and fixing portion at the corner of the closed casing as the end point, and the stress generated in the annular sealing material Is also the largest.

  In general, when the case and cover are assembled, a force acts on the flat sealing surface to open the combined part of the sealed housing due to a pressure difference from the inside of the sealed housing. Material deformation occurs.

  The cover is fixed to the case by the fastening members at the four fastening portions at the four corners, but the cover tends to bulge outward from the inside of the sealed housing by the pressure P. The swelling displacement is greatest at the center of the plane of the cover, and the cover-side annular sealing surface is displaced in the opening direction with respect to the case-side annular sealing surface, and a tilt angle also occurs.

  For this reason, the outer side acts in the direction of holding down the annular sealing material and the inner side displaces the annular sealing material in the pulling direction on the side connecting the fastening and fixing portions. The largest displacement is where the stress generated on the annular seal material is high at the center of the side with the fastening fixed part as the end point. Where the seal strength of the annular seal material is required to be secured by the structure for suppressing deformation of the annular seal material Becomes

  Therefore, there is a method of suppressing the displacement by adding a fixing portion made of a fastening material at the center portion of the side where the displacement is large to enhance the sealing property, but the location of the fastening portion is doubled, and the structure of the product is doubled. It is not a good idea to increase the price of the product, as it becomes more complicated.

  Further, in Patent Document 1 described above, a groove formed at the peripheral edge of the case main body is filled with a sealing material, and the cover has a flat portion adhered to the sealing material in the groove. A seal that abuts the stepped portion on the outer periphery with the end of the flat portion of the cover so that the adhesive strength of the sealing material between the case body and the cover can be maintained in the tensile direction, and is maintained at a tensile strength more advantageous than the shear strength. According to the structure, the sealing strength can be obtained without increasing the size of the bonding portion.

  In the structure shown in FIG. 2 of Patent Document 1, a contact portion between the step on the outer periphery of the case and the end of the flat portion of the cover is provided on the entire periphery. In the case of 100 μm, in the case of a case molded by die casting etc., and in the case of a molded product cover by press working, the variation in the finished size of the product is assumed to be several hundred μm. It is possible that they do not touch.

In such a state, the deformation of the central portion of the side of the closed casing cannot be suppressed, and when a stress exceeding the strength of the annular seal occurs, the annular seal is broken and the hermeticity of the closed casing is impaired. It will be.
Further, in the dimensional relationship where the end face of the cover flat portion and the step portion on the outer periphery of the case come into contact with each other, it is assumed that they are likely to interfere with each other and are difficult to assemble.

  Further, in the case of the structure shown in FIG. 4 of Patent Document 1, a protrusion engaging with the cover flat portion is provided on the step portion on the outer periphery of the case to press the upper surface of the cover flat portion. In order to assemble into a shape that ensures that the four-sided projections engage with the cover flat part in a rectangular-shaped closed casing, the cover flat part is bent by a method such as bending the protrusion after attaching the cover to the step part of the case. There is a problem that the steps are engaged, and the assembling step is complicated and the number of manufacturing steps is increased.

  Further, in Patent Document 2 described above, the seal cross-sectional structure of each part of the side between the fastening and fixing portion of the case body and the cover is such that the seal cross-sectional area at the end of the side is reduced while maintaining waterproofness. The electronic control device has a sealed housing structure characterized by having a structure of a sealing surface smaller than the cross-sectional area in the above. In the bonding surface width W and the bonding thickness G forming the sealing cross section, the bonding surface width is fixed. In this case, the sectional area is changed by the thickness G.

  However, the deformation due to the force to open the fastening surface of the closed casing is a deformation that causes the cover constituting the closed casing to expand in a drum shape. It is conceivable that the sealing material is displaced in a direction to hold the sealing material, and the larger the bonding thickness G is, the larger the deformation amount is, and the effect of the sealing property cannot be obtained.

  The present application discloses a technique for solving the above-described problem, in which a circuit board is hermetically housed in a sealed housing formed by a case and a cover, and is provided at an outer circumferential position of the case and an outer circumferential position of the cover. It is an object of the present invention to provide an electronic control device capable of improving the hermeticity of a formed annular seal portion.

  The electronic control device disclosed in the present application has a sealed housing configured by a case and a cover, and a connector housing that is hermetically housed in the sealed housing and partially exposed from an opening of the case. A circuit board, wherein an annular seal portion is formed at an outer peripheral position of the case and an outer peripheral position of the cover, and an electron is integrally fastened by a fastening material at a fastening portion at the outer peripheral position of the case and the outer peripheral position of the cover. The control device, wherein the annular seal portion includes a case-side annular seal surface at an outer peripheral position of the case, a cover-side annular seal surface at an outer peripheral position of the cover, the case-side annular seal surface, and the cover-side annular seal. An annular sealing material to be filled between the fastening seal portion and the fastening fixing portion, the thickness H being in contact with the cover-side annular sealing surface to determine an interval between the fastening sealing surfaces. The case-side annular sealing surface or the peripheral portion of the cover-side annular sealing surface includes a fastening seat having a fastening abutting surface. Or a case-side step or a cover-side step having a step size Δh protruding from the case-side annular seal surface or the cover-side annular seal surface to the convex side with respect to the opposing contact surface, and The inside of the portion has a width and a height that are a seal cross-sectional shape filled with the annular sealing material, and when the case and the cover are combined, the case-side step portion or the cover-side step portion faces each other. And the first contact surface is in contact with the sealing surface, and when the cover is fastened to the case by the fastening material up to the fastening contact surface in the fastening portion, the case-side step portion or the cover-side step is formed. The seal surface opposed by the difference portion has a hermetically sealed structure of the annular seal portion which is engaged and fastened in a radius shape bent in the step size Δh.

  In the electronic control device disclosed in the present application, a circuit board is hermetically housed in a closed casing formed by a case and a cover, and the sealing performance of an annular seal portion formed at an outer peripheral position of the case and an outer peripheral position of the cover is improved. And an electronic control device capable of performing the operation.

FIG. 3 is a perspective view illustrating an appearance of a cover in the electronic control device according to the first embodiment. FIG. 2 is a perspective view illustrating an appearance of a case in the electronic control device according to the first embodiment. It is sectional drawing which shows the general annular seal part for comparing the electronic control apparatus by Embodiment 1, (a) is sectional drawing which shows the state in which internal pressure is not applied, (b) is internal sectional pressure. FIG. 4 is a cross-sectional view showing a state in which the cover is folded. FIG. 9 is a cross-sectional view showing another modification of the general annular seal portion for comparing the electronic control device according to the first embodiment, in which (a) is a cross-sectional view showing a state where no internal pressure is applied, and (b) is a cross-sectional view. () Is a cross-sectional view showing a state where an internal pressure is applied. FIG. 2 is an exploded perspective view showing the electronic control device according to the first embodiment. FIG. 6 is an enlarged perspective view of a part A in FIG. 5 showing the electronic control device according to the first embodiment. FIG. 7 is a cross-sectional view of the electronic control device according to the first embodiment, taken along line VII-VII of FIG. 6. FIG. 3 is a cross-sectional view showing an annular seal portion in the electronic control device according to the first embodiment. FIG. 3 is a cross-sectional view showing an annular seal portion in the electronic control device according to the first embodiment. FIG. 3 is a cross-sectional view showing an annular seal portion in the electronic control device according to the first embodiment. FIG. 2 is a side view showing the electronic control device according to the first embodiment. FIG. 12 is a cross-sectional view of the electronic control device according to the first embodiment, taken along line XII-XII of FIG. 11. FIG. 13 is a cross-sectional view illustrating another modified example of FIG. 12 in the electronic control device according to the first embodiment. FIG. 13 is a cross-sectional view illustrating another modified example of FIG. 12 in the electronic control device according to the first embodiment. FIG. 12 is a side view showing a state in which the electronic control device according to the first embodiment is fastened and assembled in FIG. 11. FIG. 16 is a cross-sectional view illustrating another modified example of FIG. 15 in the electronic control device according to the first embodiment. FIG. 16 is a cross-sectional view illustrating another modified example of FIG. 15 in the electronic control device according to the first embodiment. FIG. 16 is an enlarged side view of a portion B of FIG. 15 showing the electronic control device according to the first embodiment. FIG. 18 is an enlarged side view of a part C in FIG. 17 illustrating the electronic control device according to the first embodiment. FIG. 4 is a cross-sectional view showing an annular seal portion in the electronic control device according to the first embodiment, where (a) is a cross-sectional view showing a state where no internal pressure is applied, and (b) is a cross-sectional view showing a state where an internal pressure is applied. is there. FIG. 13 is a perspective view showing a case in the electronic control device according to the second embodiment. FIG. 22 is a cross-sectional view of the electronic control device according to the second embodiment taken along line XX in FIG. 21, where (a) is a cross-sectional view showing a state where no internal pressure is applied, and (b) is a cross-sectional view showing a state where the internal pressure is applied. FIG. FIG. 22 is a perspective view showing another modified example of FIG. 21 in the electronic control device according to the second embodiment. FIG. 24 is a cross-sectional view of the electronic control device according to the second embodiment taken along line YY in FIG. 23, where (a) is a cross-sectional view illustrating a state where no internal pressure is applied, and (b) is a cross-sectional view illustrating a state where the internal pressure is applied. FIG. FIG. 13 is a cross-sectional view illustrating an annular seal portion in the electronic control device according to the third embodiment. FIG. 25 is a cross-sectional view showing another modified example of FIG. 24 in the electronic control device according to the third embodiment. FIG. 25 is a cross-sectional view showing another modified example of FIG. 24 in the electronic control device according to the third embodiment.

Embodiment 1 FIG.
Hereinafter, embodiments of the electronic control device of the present application will be described in detail below. In each embodiment, the same components are given the same names or reference numerals. In addition, the overlapping description may be omitted.

FIG. 1 is a perspective view showing an appearance of a cover in the electronic control device according to the first embodiment. FIG. 2 is a perspective view showing an appearance of a case in the electronic control device according to the first embodiment.
A sealed housing 100 serving as an electronic control unit is formed of a heat-dissipating aluminum material or the like in which a part of a resin connector housing 500 is housed to accommodate a circuit board 400 described later mounted so as to be exposed to the outside. The sealing surfaces of the die-cast case 200 and the resin or metal cover 300 for covering the outer peripheral opening of the case 200 are joined together. A sealing structure in which an annular sealing material 610 described later is filled is formed. In the four corner fixing portions 110, the case 200 and the cover 300 are integrally fastened by inserting a fastening material 130 such as a screw or a caulking into the fastening material insertion portion 202.

  FIG. 5 is an exploded perspective view showing the electronic control device according to the first embodiment of the present application. FIG. 3 is an exploded perspective view in which a closed casing serving as an electronic control device is exploded. FIG. 6 is an enlarged perspective view showing the details of the portion A in FIG. 5, and FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6, showing a state where the cover is combined with the case side.

  In FIG. 5, a closed casing 100A is constituted by a case 200A and a cover 300A. The circuit board 400 is mounted with a resin connector housing 500 having a plurality of connection terminals connected to the wiring pattern of the board, and has a structure in which a part is exposed from the opening 203 of the case 200A.

  The circuit board 400 is housed in a closed casing 100A constituted by a case 200A and a cover 300A, and the cover 300A is fixed to the case 200A by a fastening member 130 such as a screw, which is a fastening related member 120, at a fastening fixing portion 110 at four corners. To form a sealed housing 100A.

  The outer peripheral portion of the contour of the connector housing 500 exposed from the opening 203 of the case 200A is waterproof-sealed by a connector sealing material applied around the opening 203.

  In addition, as shown in the enlarged perspective view of FIG. 6, the corner fixing fastening portion 110 for fastening the case 200A and the cover 300A is defined as an end point at the center of the case-side annular sealing surface 210 at the outer peripheral position of the case 200A. A case-side step portion 211A having a length Lt, a height Ht, and a depth dimension of Wt in the side direction is provided at a peripheral edge of the case-side annular sealing surface 210 at a center portion C210 of the side. As an example, the case-side step portion 211A is arranged symmetrically with respect to a center portion C210 of a side having the fastening fixing portion 110 as an end point.

  The case-side step portion 211A is a step projecting to the convex side from the fastening contact surface 201S of the fastening seat 201. As shown in FIG. 7, when the case 200A is combined with the cover 300A, the case-side step portion 211A opposes. The outer peripheral surface of the cover 300A is in contact with the cover-side annular seal surface 310 with the step dimension Δh as shown in FIG. 11 described later with reference to the surface of the fastening contact surface 201S.

  As described above, the case-side annular sealing surface 210 has a case-side stepped portion 211A at the outer peripheral end at the center of the plurality of sides of the case-side annular sealing surface 210 to face the cover-side annular sealing surface 310 to be combined. The semi-fluid and viscous annular sealing material 610 is applied to the sealing surface having the width Ws excluding the case-side step portion 211A and the continuous case-side annular sealing surface 210.

  Then, in the fastening portion 110, the fastening material 130 such as a screw, a tapping screw, and a caulking is inserted into the fastening material insertion portion 202, and the cover-side annular sealing surface 310 is moved up to the height Hs of the fastening contact surface 201 </ b> S of the fastening seat 201. At the time of pressing and fixing, the annular sealing material 610 applied to the case-side annular sealing surface 210 is filled between the case-side annular sealing surface 210 and the cover-side annular sealing surface 310, and thereafter, the annular sealing material 610 is applied. The sealing mating surface between the case 200A and the cover 300A is hardened to form an annular seal portion 600A bonded and integrated with the annular seal material 610 to form a sealed structure.

  The shapes of the annular sealing surface 210 of the case 200A and the annular sealing surface 310 of the cover 300A are not limited to the above-described structure of FIG. 7, but may be other structures. For example, a structure as shown in FIGS. 8, 9, and 10 can be adopted. FIG. 8 is a sectional view showing an annular seal portion in the electronic control device according to the first embodiment. FIG. 9 is a sectional view showing an annular seal portion in the electronic control device according to the first embodiment. FIG. 10 is a sectional view showing an annular seal portion in the electronic control device according to the first embodiment.

  FIG. 8 shows a case where the thickness of the cover 300A is larger than the thickness of the cover 300A of FIG. 7, and FIG. 9 shows a case-shaped annular sealing surface 210a having a concave shape and a cover-side annular sealing surface 310a having a concave shape. FIG. 10 shows a case-shaped annular sealing surface 210b having a stepped shape. As described above, the shape of the annular sealing surface 210 of the case 200A and the annular sealing surface 310 of the cover 300A may be any of a planar shape or an uneven shape, and the annular shape is provided inside the case-side step portion 211A or the cover-side step portion 311A. Any shape may be used as long as the sealing material 610 is filled so that the sealing property can be ensured.

  FIG. 11 is a side view showing the electronic control device according to the first embodiment, and is a side view showing the case-side step portion 211A in the first embodiment of FIG. With the cover-side annular sealing surface 310 in contact with the upper surface of the case-side step portion 211A, the case 200A and the cover 300A are combined, and the step size between the fastening contact surface 201S is Δh. FIG. 12 is a sectional view taken along line XII-XII in FIG.

  In FIG. 12, the case-side step portion 211A is provided at the outer peripheral end of the case-side annular sealing surface 210, and the height of the case-side step portion 211A is Ht from the case-side annular sealing surface 210. is there.

  13 and 14 each show another modification of FIG. 12, and FIG. 13 is a cross-sectional view showing another modification of FIG. 12 in the electronic control unit according to the first embodiment. FIG. 14 is a cross-sectional view showing another modification of FIG. 12 in the electronic control device according to the first embodiment.

  In FIG. 13, the cover-side step portion 311A is provided at the outer peripheral end of the cover-side annular seal surface 310 and protrudes from the contact surface of the cover-side annular seal surface 310 that comes into contact with the fastening contact surface 201S on the convex side. Δh, and the height thereof is Ht, and the shape is in contact with the opposed case-side annular sealing surface 210.

  In FIG. 14, the steps are provided on the outer peripheral ends of the case-side annular sealing surface 210 and the cover-side annular sealing surface 310 as a case-side step 211A1 and a cover-side step 311A1, respectively. The portion 211A1 and the cover-side step portion 311A1 have a step size Δh protruding toward the convex side with respect to the contact surface of the fastening contact surface 201S as shown in the embodiment of FIG. In FIG. 14, the height of the case-side step 211A1 and the height of the cover-side step 311A1 are set to Ht / 2, respectively, with respect to the step height Ht. When it is desired to secure the strength of the outer peripheral edge of the cover with a thin metal press-formed cover, a method in which a step portion is provided as the cover-side step portion 311A1 on the cover-side annular sealing surface 310 is considered to be useful.

  FIG. 15 is a side view of the electronic control device according to the first embodiment in a state in which the fastening and assembling of FIG. 11 is assembled, and is a side view in a state where the case 200A and the cover 300A are fastened and fixed.

  The cover-side annular sealing surface 310 is pushed by the fastening material 130 to the contact surface of the fastening contact surface 201S of the fastening seat 201 and is fastened. The height Hs of the fastening contact surface 201S is the thickness of the annular seal member 610 in the vicinity of the fastening portion 110. When the case 200A and the cover 300A are combined, the case-side step portion 211Aa having a step size Δh protruding to the convex side with reference to the surface of the fastening contact surface 201S is in contact with the opposing cover-side annular sealing surface 310. When the cover-side annular seal surface 310 is fastened, both ends of the case-side step portion 211A having a length Lt and a height Ht are contact points, and are fixed at the position of the fastening fixing portion 110. .

  Accordingly, as shown in FIG. 15, the cover-side annular sealing surface 310 has a shape in which the case-side step portion 211A is bent by the dimension of the step size difference Δh with respect to the fastening contact surface 201S of the fastening seat 201, and has a case-side step portion 211A. Is fixed by the rigid body.

  Then, the cover 300A can be manufactured in a thin and thick shape by pressing a metal such as iron or aluminum. Even under the condition where the cover 300A is bent and fixed by several hundred μm, there is no strength problem within the allowable range of the elastic deformation. The details of the engaged state of the sealing surface that contacts the step portion will be described later with reference to FIG.

FIG. 16 is a cross-sectional view showing another modification of FIG. 15 in the electronic control device according to the first embodiment.
With respect to the shape of the length Lt of the case-side step portion 211A shown in FIG. 16, the contact point to the cover-side annular sealing surface 310 is set to the same position, and the step portion is divided into a plurality of left and right portions. A case-side stepped portion 211B1 and a case-side stepped portion 211B2 are divided and arranged. The step portion similar to FIG. 15 and the surface of the fastening contact surface 201S have a step size Δh protruding toward the convex side. Although a space is provided between the case-side step portion 211B1 and the case-side step portion 211B2 which are separately arranged on the left and right, as in the first embodiment described above, the cover-side annular sealing surface 310 is formed between the case-side step portion 211B1 and the case side. An annular seal portion 600A engaged with both ends of the step portion 211B2 as contact points.

  FIG. 17 is a cross-sectional view showing another modification of FIG. 15 in the electronic control device according to the first embodiment, and is different from the modification of FIG. 16 in the case-side step portion 211B1 and the case-side step portion which are separately arranged on both sides. In addition to the case 211B2, a case-side step 211C is provided at the center between the case-side step 211B1 and the case-side step 211B2. That is, it is divided and arranged at three ends, both ends and the center.

  The cover-side annular sealing surface 310 is abutted and fastened at the ends of the case-side step portion 211B1 and the case-side step portion 211B2, so that the shape of the central bent portion and the central case-side step portion 211C are provided. Are set to the step size Δhc so as to abut.

  FIG. 18 is an enlarged side view showing details of part B of FIG. 15 in the first embodiment, and shows a state where case 200A and cover 300A are fastened and combined. The configuration is as shown in FIG. 15, and opposing sealing surfaces are engaged and supported at both ends of the case-side step portion 211A. And although there is a bent shape surface and a gap in the central part, the inside of the case-side step part 211A is a part of the sealing surface and is filled with the applied annular sealing material 610, and the waterproofness is not impaired.

  FIG. 19 is an enlarged side view showing details of a portion C in FIG. 17 in the first embodiment, and shows a state where case 200A and cover 300A are fastened. The configuration is as shown in FIG. 17, and the step of the case-side step portion 211C at the center is larger than the step size Δh of the case-side step portion 211B1 at both ends with respect to the surface of the fastening contact surface 201S. From the state where the cover-side annular sealing surface 310 is in contact with the case-side step portion 211B1, the fastening fixing portion 110 has a step size along the bending shape of the step size Δh by the fastening material 130 in the fastening portion 110.

  Accordingly, the cover-side annular sealing surface 310 is in contact with and engaged with both the case-side step portion 211B1, the case-side step portion 211B2, and the case-side step portion 211C, and the integrally formed case according to the first embodiment. The inclination of the sealing surface in contact with the central portion of the side of the side step portion 211A is suppressed, and a more effective sealing structure of the annular seal portion 600A is obtained.

  In the description of the configuration of FIGS. 11 to 19, as an example of one step portion, for example, the configuration as the case-side step portion 211A has been described, but it is stated that there are various combinations of the shape of the step portion and the mounting portion. Keep it.

  Next, the operation will be described. The sealing structure of the mating surface of the case 200A and the cover 300A will be described by comparing the case before and after the means for solving the problem are implemented.

  FIG. 3A is a cross-sectional view of a state in which the case 200 and the cover 300 are assembled when the thickness of the annular sealing material 610 is Tss. FIG. FIG. 13 is a diagram illustrating a deformed state of the cover 300 and the annular sealing member 610 in a state where a force is applied so that a joint portion of the closed casing is opened by a pressure difference.

  Although the cover 300 is fixed to the case 200 by the fastening members 130 at the four fastening portions 110 at the corners, the cover 300 tends to bulge outward in a drum shape due to the pressure P of the pressure difference between the inside and outside of the closed casing 100. The displacement is greatest at the center of the surface of the cover 300 surrounded by the four corner fixing portions, and the cover-side annular sealing surface 310 is displaced in a direction to open from the case-side annular sealing surface 210, and FIG. As shown in the cross-sectional view of FIG.

  Therefore, on the outer side, the annular sealing material 610, which is an elastic body, is compressed by the inclination of the sealing surface, and the inner side is compressed in the pulling direction by the displacement due to the pressure P and the inclination of the sealing surface on the outer side of the side having the fastening fixing portion 110 as an end point. It is displaced, and the displacement becomes the largest at the center of the side.

  FIG. 4A shows a state in which the thickness of the annular sealing material 610 is increased from the structure of FIG. 3A and the case 200 and the cover 300 are assembled at Tsd in order to improve the adhesive strength of the sealing material. FIG.

  FIG. 4B shows a state in which the pressure inside the closed casing 100 is higher than the outside and a force is applied so that the mating portion of the closed casing 100 is opened due to the pressure difference as in FIG. 3B. FIG.

  The action of the cover 300 swelling outward in a drum shape due to the pressure difference P between the inside and outside of the closed casing 100 is the same as that of FIG. 3B, but the case side of the cover-side annular sealing surface 310 at the center of the side. The displacement of the inclination with respect to the annular sealing surface 210 is easily deformed because the thickness of the annular sealing material 610, which is an elastic body, is increased to Tss <Tsd. Therefore, the inclination of the cover-side annular sealing surface 310 is θab <θcd. Thus, the effect of suppressing the deformation of the annular sealing material 610 is small, and it can be said that a means of increasing the thickness of the annular sealing material 610 to improve the adhesive strength of the annular sealing material 610 has little effect of improving the sealing performance.

  FIG. 20 is a cross-sectional view showing an annular seal portion in the electronic control device according to the first embodiment, where (a) is a cross-sectional view showing a state where no internal pressure is applied, and (b) is a cross-sectional view showing a state where the internal pressure is applied. It is sectional drawing. FIG. 20B is a view showing a cross section of the annular seal portion 600A in a state in which the cover-side annular seal surface 310 is engaged with the case-side step portion 211A in FIG. 3 shows a state of the cover-side annular sealing surface 310 in a state in which a pressure P different from the outside air acts from the inside.

  The cover 300A is subjected to a force such that the central portion of the cover swells like a drum by the pressure P, but the cover-side annular sealing surface 310 has a case-side step portion 211A having a step size Δh protruding from the fastening contact surface 201S on the convex side. And is deformed at a tilt angle θt with respect to the case-side annular sealing surface 210.

  This inclination angle θt has no stepped portion, for example, θt <θab as compared with the case of FIG. 3B, and the effect of deforming the annular sealing material 610 which is an elastic body is suppressed. It is possible to obtain an electronic control device having an optimally sealed structure of the annular seal portion 600A that can secure the adhesive strength for the annular seal member 610 whose surface displacement is suppressed.

  Next, features of each embodiment and claims will be described. The electronic control device according to claims 1 and 2 in this embodiment is a device in which a circuit board 400 on which a resin connector housing 500 is mounted is hermetically housed in a sealed housing 100A formed of a case 200A and a cover 300A. The fastening fixing portions 110 at the four corners of the outer periphery of 300A are provided with fastening seats 201, and there is a half between the case-side annular sealing surface 210 on the outer periphery of the case 200A and the cover-side annular sealing surface 310 on the outer periphery of the cover 300A. When the case 200A and the cover 300A are fastened and integrated with each other, the thickness of the annular seal material 610 in the vicinity of the fastening portion 110 is reduced to the fastening seat 201 when the case 200A and the cover 300A are fastened and integrated. Is secured by the height of the fastening contact surface 201S.

  In addition, when the ambient temperature rises due to use as an electronic control device, the electronic components on the circuit board 400 operate and generate heat, and the internal pressure of the sealed housing 100A rises, when the internal surfaces of the case 200A and the cover 300A are fastened to each other. The inner pressure acts on the case-side annular sealing surface 210 and the cover-side annular sealing surface 310 at the outer peripheral position in the opening direction, and the displacement becomes maximum at the center C210 of the side having the fastening fixing portion 110 as an end point. At the peripheral edge of the side annular seal surface 210 and the cover side annular seal surface 310, a case-side step portion 211A or a cover-side step portion 311A that first comes into contact with the seal surface facing when the case 200A and the cover 300A are combined. The case-side step portion 211A or the cover-side step portion 311A has a step size of Δh with respect to the fastening contact surface 201S of the fastening seat 201. That a stepped, annular seal member 610 is applied to the fastening surface of the peripheral position.

  After that, when the fastening member 130 is pushed and fixed to the fastening contact surface 201S of the fastening seat 201 at the position of the fastening fixing portion 110 by the fastening material 130, the fastening surface formed by the sealing surface facing the case-side step portion 211A or the cover-side step portion 311A is: The engagement is performed with the step size Δh bent, and the fastening surface is integrated with the bent shape corresponding to the strength.

  By setting the step size Δh in consideration of the dimensional tolerance of the parts, the height Ht of the step portion between the case 200A and the cover 300A is not precisely processed by a cutting process or the like, and a measure against the hermeticity is required most. The case 200 </ b> A and the cover 300 </ b> A can be brought into contact with each other at a center position of a side having the fastening fixing portion 110 as an end point.

  The case-side annular seal surface 210 and the cover-side annular seal surface 310 that have been engaged and fastened are stiffened, and the case-side annular seal surface 210 and the cover-side annular seal surface 310 tend to open due to internal pressure. Is suppressed, and the amount of tensile deformation and generated stress of the annular seal member 610 inside the case-side annular seal surface 210 and the cover-side annular seal surface 310 is reduced without pressing the annular seal member 610. The durability of the sealing performance of the part 600A can be improved.

  And since it is a structure which can control the amount of deformation of annular sealant 610, it is easy to aim at optimization of thickness of annular sealant 610, and there is an effect which can reduce the usage of annular sealant 610.

  Further, the structure in which the stepped portion provided on the seal surface at the outer peripheral position of the case 200A or the cover 300A is engaged and integrated with the sealing surface facing the stepped portion, the annular sealing material is provided inside the case-side stepped portion 211A or the cover-side stepped portion 311A. 610 may be a combination of sealing surfaces having a cross section that secures adhesive strength, and a processing step that requires flatness and parallelism of the sealing surface is unnecessary. The structure of the present application employs the case-side annular sealing surface 210 of the case 200A and the cover. Since there is no complicated seal structure in which the concave annular groove and the convex ridge are formed on the cover side annular sealing surface 310 of 300A, there is an effect that the manufacturing cost can be reduced.

  The cross-sectional area of the annular sealing material 610 on the fastening surface is designed to have a sufficient adhesive strength under the conditions in which the electronic control device is used, but the thickness of the annular sealing material 610 is reduced in the vicinity of the fastening portion 110. It can be determined by the height of the fastening contact surface 201S of the seat 201, the process control of the application amount of the annular sealing material 610 in the assembling process is easy, and the thickness variation of the annular sealing material 610 in the assembling can be suppressed. Also, there is an effect that the quality of the hermeticity of the annular seal portion 600A can be stabilized.

  In relation to the third and fourth aspects of the electronic control device according to this embodiment, a central portion C210 of a side having the case-side step portion 211A or the cover-side step portion 311A as an end point of the fastening portion 110 is symmetrically divided into a plurality of portions. A sealed housing 100A having a structure of an annular seal portion 600A, wherein when the case 200A and the cover 300A are combined, a case-side step portion 211A or a cover-side step portion whose step size from the fastening contact surface 201S is Δh. When the sealing surface 311A and the opposing sealing surface first contact each other, and then are pushed and fixed by the fastening material 130 in the fastening portion 110, the case-side annular sealing surface 210 and the cover-side annular sealing surface 310, which are integrated into one piece, Thus, the engagement abutment surface 201 </ b> S 201 is integrally engaged with the engagement abutment surface 201 </ b> S in a shape bent by the step size Δh.

  Then, the case-side annular sealing surfaces are further provided by the case-side step portions 211B and 211C or the cover-side step portions 311B and 311C (not shown) abutting on the bent shape. 210, the cover-side annular seal surface 310 is strengthened in rigidity, so that the cover-side annular seal surface 310 does not press the annular seal member 610 due to the deformation of the cover-side annular seal surface 310 due to the internal pressure, and the displacement in the opening direction is also suppressed. In addition, the amount of tensile deformation and generated stress of the annular seal member 610 is reduced, and the durability of the hermeticity of the annular seal portion 600A can be improved.

  And since it is a structure which can control the amount of deformation of annular sealant 610, it is easy to aim at optimization of thickness of annular sealant 610, and there is an effect which can reduce the usage of annular sealant 610. In addition, the case side step portions 211B and 211C or the cover side step portions 311B and 311C (not shown) are divided and arranged at required positions, so that there is an effect of reduction in manufacturing cost due to material reduction.

  In FIGS. 15 to 20 described above, the case-side step portion 211A, the case-side step portion 211B, and the case-side step portion 211C have been described. However, the present invention is not limited thereto. The cover side step 311B1 (not shown) and the cover side step 311B2 (not shown) may be divided and arranged, or the cover side step 311B1 (not shown). ) And the cover-side step 311B2 (not shown), the cover-side step 311C (not shown) may be divided into three parts, and the same effect can be obtained. Alternatively, case side step 211A, case side step 211B, case side step 211C, cover side step 311B1 (not shown), cover side step 311B2 (not shown), cover side step 311C (FIG. (Not shown) may be provided, and the same effect is obtained.

Embodiment 2 FIG.
Hereinafter, an electronic control device according to the second embodiment of the present application will be described. FIG. 21 is a perspective view showing a case in the electronic control device according to the second embodiment. 22 is a cross-sectional view of the electronic control device according to the second embodiment taken along line XX in FIG. 21, (a) is a cross-sectional view showing a state where no internal pressure is applied, and (b) is a cross-sectional view showing a state where internal pressure is not applied. FIG. 4 is a cross-sectional view showing a state in which the cover is folded. FIG. 23 is a perspective view showing another modified example of FIG. 21 in the electronic control device according to the second embodiment. 24 is a cross-sectional view of the electronic control device according to the second embodiment, taken along line YY in FIG. 23. FIG. 24A is a cross-sectional view illustrating a state where no internal pressure is applied, and FIG. FIG. 4 is a cross-sectional view showing a state in which the cover is folded. The structure, operation, and characteristics of the device will be described with reference to FIGS.

  FIG. 21 shows a case 200B according to the first embodiment of the present application, in which the case 200B has a seal surface structure in which a case seal annular inclined surface 212 is provided on the entire inner periphery of the case-side annular seal surface 210. It is. If the inclined shape of the case seal annular inclined surface 212 is smoothly connected to the case-side annular seal surface 210, the inclined shape may be constituted by a straight line or a curved line.

  FIG. 22A shows a case seal annular inclined surface 212 provided on the entire circumference with an inclined surface connected to the case-side annular seal surface 210 of the case 200B. FIG. 22B is a cross-sectional view illustrating a deformed state of the sealing surface in a state where the pressure P inside the sealed casing 100B according to the second embodiment is applied.

  The thickness of the annular sealing material 610 in the cross section of the case-side step portion 211A is obtained by adding the height Hsk of the case-side step portion 211A from the case-side annular sealing surface 210 to the height Hsk of the case-sealing annular inclined surface 212. The sealing structure is an annular sealing portion 600B having a large thickness.

  The cover-side annular sealing surface 310 is engaged with and fixed to the cover-side annular sealing surface 310 opposed by the case-side step portion 211A in a bent shape having a step size Δh with respect to the surface of the fastening contact surface 201S at the time of fastening. The deformation of the tilt with respect to the case-side annular sealing surface 210 is suppressed.

  In the sectional view of FIG. 22A, the annular seal member 610 is a ring seal member in which the height Hsk of the inclined surface and the height Ht of the case-side step portion 211A are added at the innermost part of the case seal annular inclined surface 212. 610, which has an effect of suppressing the deformation rate of the annular sealing material 610, and has a structure in which the sealing property is enhanced.

  As described above, in relation to the fifth and sixth aspects of the electronic control device according to this embodiment, the inner annular seal member 610 on the case seal annular inclined surface 212 connected to the seal surface provided inside the case-side annular seal surface 210. Is thicker than the seal thickness of the flat sealing surface, taking into account the inclination height.

  Then, under the condition that the closed casing 100B receives the internal pressure load, the cover 300B restrained by the fastening fixing portions 110 at the four corners on the outer periphery of the closed casing 100B bulges from the center of the surface to the top, and deforms. In response to this deformation, the portion inside the cover-side annular sealing surface 310 is deformed on the pulling side. However, since the thickness of the annular sealing material on the flat sealing surface is smaller than the thickness of the annular sealing material on the inclined surface, the displacement amount is the same. The ratio of the deformation of the annular sealing material 610 to that of the flat sealing surface is smaller than that of the flat sealing surface, and has an effect of suppressing the deformation rate of the annular sealing material 610, and the resistance of the annular sealing portion 600B to the internal pressure load of the closed casing 100B can be improved. There is a feature.

  In addition, the case seal annular inclined surface 212 of the case-side annular seal surface 210 may have an inclined surface starting from the root of the case-side stepped portion 211A. And increase economic efficiency. Further, since the deformation of the sealing material is small in the vicinity of the base of the case-side step portion 211A, even if an inclined surface is provided, the effect of improving waterproofness is small.

  Properly setting the dimensions of the case seal annular inclined surface 212 has the effect of improving the adhesive strength of the seal surface portion and improving the waterproof strength while suppressing the amount of the annular seal material 610 used.

  FIG. 23 is a modified example of the case 200B of the present application with respect to the second embodiment. The inclined surface smoothly connected to the case-side annular sealing surface 210 is centered on the center C210 of the side having the fastening fixing portion 110 as an end point. The seal surface has a structure of a case seal central inclined surface 213 having a length Lk symmetrically.

  FIG. 24A shows a case seal center inclined surface 213 provided at the center of a side having the fastening portion 110 as an end point on the case-side annular sealing surface 210 of the case 200B. FIG. 24B is a cross-sectional view of the central seal portion, and shows a deformed state of the seal surface in a state where the pressure P inside the sealed housing 100B according to the second embodiment is applied.

  The thickness of the annular sealing material 610 in the cross section of the case-side step portion 211A is obtained by adding the inclination height Hsk of the case seal central inclined surface 213 and the height Ht of the case-side step portion 211A from the case-side annular sealing surface 210. The sealing structure is an annular sealing portion 600B having a large thickness.

  The cover-side annular sealing surface 310 is engaged with and fixed to the cover-side annular sealing surface 310 opposed by the case-side step portion 211A in a bent shape having a step size Δh with respect to the surface of the fastening contact surface 201S at the time of fastening. The deformation of the tilt with respect to the case-side annular sealing surface 210 is suppressed.

  In the sectional view of FIG. 24A, the annular seal member 610 is a ring seal member in which the height Hsk of the inclined surface and the height Ht of the case-side step portion 211A are added at the innermost part of the case seal central inclined surface 213. 610, which has the effect of suppressing the deformation rate of the annular sealing material 610, and has a structure in which the sealing performance is improved.

  As described above, in relation to the seventh and eighth aspects of the electronic control device according to the present embodiment, the center side of the central portion of the side centered on the side having the fastening and fixing portion 110 of the closed casing 100B as the end point is symmetrical with respect to the case side of the central portion. The thickness of the inner annular seal member 610 on the case seal center inclined surface 213 which is Lkt in the side direction on the annular seal surface 210 is larger than the seal thickness of the flat seal surface, taking into account the inclination height. .

  Then, under the condition that the closed casing 100B receives the internal pressure load, the cover 300B restrained by the fastening fixing portion 110 at the corner of the outer periphery of the closed casing 100B bulges at the center of the surface and deforms. In response to this deformation, the portion inside the cover-side annular sealing surface 310 functions as a pulling side, but since the thickness of the annular sealing material on the flat sealing surface is smaller than the thickness of the annular sealing material on the inclined surface, the same displacement amount is obtained. The rate of deformation of the annular sealing material 610 is smaller than that of the flat sealing surface, and has an effect of suppressing the deformation rate of the annular sealing material 610, and the resistance of the annular sealing portion 600B to the internal pressure load of the closed casing 100B can be improved. There are features.

  In addition, the case seal center inclined surface 213 is provided at the center of the side having the fastening and fixing portion 110 as an end point, at the portion where the deformation action is greatest, so that the annular seal is different from the embodiment according to claims 5 and 6. The amount of the annular sealing material 610 used can be suppressed while maintaining the waterproof strength of the portion 600B.

  21 to 24 described above, the case where the case seal annular inclined surface 212 or the case seal central inclined surface 213 is provided so as to be connected to the case-side annular seal surface 210 is described. The annular inclined surface 212 or the case seal central inclined surface 213 may be provided so as to be connected to the cover-side annular sealing surface 310, and the same effect is obtained.

Embodiment 3 FIG.
Hereinafter, an electronic control device according to Embodiment 3 of the present application will be described. FIG. 25 is a sectional view showing an annular seal portion in the electronic control device according to the third embodiment. FIG. 26 is a cross-sectional view showing another modification of FIG. 24 in the electronic control device according to the third embodiment. FIG. 27 is a cross-sectional view showing another modification of FIG. 24 in the electronic control device according to the third embodiment. The structure, operation, and characteristics of the device will be described with reference to FIGS.

  FIG. 25 shows a closed structure of an annular seal portion 600C in which a cover inner inclined surface 312 is provided inside a cover 300C as compared with Embodiment 1 of the case 200A to be covered by the present application, as in Embodiment 2 described above. This is effective for the case 200C or the like that does not have a sufficient thickness to provide an inclined surface on the case-side annular sealing surface 210.

  FIG. 26 shows the sealing of an annular seal portion 600C using a case seal annular inclined surface 212 and a case seal central inclined surface 213 that smoothly connect the inclined surface to the cover inner inclined surface 312 of the cover 300C, the case-side annular seal surface 210 of the case 200C. It is a structure.

  The innermost thickness of the annular seal member 610 in the case of FIG. 27 is the thickness Hss obtained by adding the height Ht of the case-side step portion 211A and the height Hsk of the cover inner inclined surface 312, and the annular seal in the case of FIG. The innermost thickness of the material 610 is the sum of the height Ht of the case-side step portion 211A, the height of the case seal annular inclined surface 212, the height of the case seal central inclined surface 213, and the height of the cover inner inclined surface 312 of the cover 300C. Hss, and the structure of the annular seal portion 600C according to the structure and shape of the case 200C and the cover 300C is possible.

  FIG. 27 shows a case in which the cross section of the case seal annular inclined surface 212 of the case side annular seal surface 210 of the case 200C, the case seal central inclined surface 213, and the cover inner inclined surface 312 of the cover 300C are used together. In the case where the case-side annular sealing surface 210 projects to the convex side with respect to the fastening contact surface 201S of the fastening seat 201 of the fastening fixing portion 110 of the case 200C, the case 200C has a function as a case-side step portion 211A. Therefore, when the opposed cover-side annular seal surface 310 is fastened, the cover-side annular seal surface 310 is pressed down to the fastening contact surface 201S of the fastening seat 201 in the fastening portion 110 at the fastening portion 110, and the fastening material 130 The case-side step portion 211A and the cover-side annular sealing surface 310 are engaged and fixed.

  As described above, in relation to the ninth aspect of the electronic control device according to this embodiment, the annular sealing material 610 is also filled into the cover inner inclined surface 312 provided inside the cover 300C. In addition, the thickness becomes a thickness in consideration of the height of the inclined portion 312 on the innermost side of the seal surface.

  Then, under the condition that the closed casing 100C receives the internal pressure load, the cover 300C restrained by the fastening fixing portions 110 at the four corners on the outer periphery of the closed casing 100C bulges from the center of the surface to the top, and deforms. In response to this deformation, the portion inside the cover-side annular sealing surface 310 functions as a pulling side, but since the thickness of the annular sealing material on the flat sealing surface <the sealing thickness on the inclined surface on the inside of the cover, the same displacement occurs. The ratio of the deformation of the annular sealing material 610 to the amount is smaller than that of the flat sealing surface, and has an effect of suppressing the deformation rate of the annular sealing material 610, and it is possible to improve the strength of the sealing portion against the internal pressure load of the closed casing 100C. There are features.

  In addition, the structure of the annular seal portion 600C is configured by the case-side step portion 211A or the cover-side step portion 311A provided on the case-side annular seal surface 210 or the cover-side annular seal surface 310 and the inclined portion of the cover inner inclined surface 312. Since the sealing property can be achieved with a simple structure in which the annular sealing material 610 is filled with a cross-sectional structure, there is an effect of suppressing the manufacturing cost.

Although this application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments may apply to particular embodiments. However, the present invention is not limited to this, and can be applied to the embodiment alone or in various combinations.
Accordingly, innumerable modifications not illustrated are contemplated within the scope of the technology disclosed herein. For example, a case where at least one component is deformed, added or omitted, and a case where at least one component is extracted and combined with components of other embodiments are included.

  INDUSTRIAL APPLICABILITY The present application is suitable for realizing an electronic control device capable of improving the hermeticity of an annular seal portion formed at an outer peripheral position of a case and an outer peripheral position of a cover.

  100 Closed case, 100A Closed case, 100B Closed case, 100C Closed case, 110 Fastening fixing part, 130 Fastening material, 200 case, 200A case, 200B case, 200C case, 201 Fastening seat, 201S Fastening contact surface , 203 opening, 210 case-side annular sealing surface, 210a case-side annular sealing surface, 210b case-side annular sealing surface, 211A case-side step, 211A1 case-side step, 211B1 case-side step, 211B2 case-side step, 211C Case-side stepped portion, 212 Case seal annular inclined surface, 213 Case seal central inclined surface, 300 cover, 300A cover, 300B cover, 300C cover, 310 cover-side annular seal surface, 310a cover-side annular seal surface, 311A cover-side step , 311a1 cover side stepped portion, 400 the circuit board 500 the connector housing, 600 annular seal portion, 600A annular seal portion, 600B annular seal portion, 600C annular seal portion

Claims (9)

A closed housing constituted by a case and a cover; and a circuit board having a connector housing hermetically housed in the closed housing and partially exposed from an opening of the case, and an outer periphery of the case. An electronic control device, wherein an annular seal portion is formed at a position and an outer peripheral position of the cover, and is integrated and fastened by a fastening material at an outer peripheral position of the case and an outer peripheral position of the cover.
The annular seal portion is filled between the case-side annular seal surface at the outer peripheral position of the case, the cover-side annular seal surface at the outer peripheral position of the cover, and the case-side annular seal surface and the cover-side annular seal surface. Provided with the annular sealing material,
The fastening fixing portion includes a fastening seat that has a thickness Hs that is in contact with the cover-side annular sealing surface and has a thickness Hs that determines an interval between the fastening sealing surfaces,
In the peripheral portion of the case-side annular sealing surface or the cover-side annular sealing surface, the case side with respect to the fastening contact surface or the abutting surface facing the center of a side having the fastening fixing portion as an end point. An annular sealing surface or a case-side step portion or a cover-side step portion having a step size Δh protruding from the cover-side annular sealing surface on the convex side, and the annular sealing material is filled inside the case-side step portion; It has a width and a height that become a seal cross-sectional shape, and when the case and the cover are combined, the case-side step portion or the cover-side step portion is in a relationship of first contacting an opposing seal surface,
In the fastening portion, when the cover is fastened to the case up to the fastening contact surface by the fastening material, a sealing surface opposed by the case-side step portion or the cover-side step portion has a deflection of the step size Δh. An electronic control device, characterized in that it has a hermetically sealed structure of the annular seal portion which is engaged and fastened in a bent radial shape.   The electronic control device according to claim 1, wherein the case-side step portion or the cover-side step portion has a length Lt symmetrical about a center of a side having the fastening fixing portion as an end point. .   The electronic control device according to claim 1, wherein the case-side step portion or the cover-side step portion is divided and arranged in a plurality.   The case-side step portion or the cover-side step portion is divided and arranged at both ends and a center, and the case-side step portion or the cover-side step portion located at both ends is the step size Δh, and is located at the center. 4. The case-side step portion or the cover-side step portion to be formed has a step size Δhc, and the size of the step size Δhc is larger than the step size Δh. Electronic control device according to the item.   5. The electronic control device according to claim 1, wherein the annular seal portion includes a case seal annular inclined surface inside the case-side annular seal surface. 6.   6. The electronic control device according to claim 5, wherein a width dimension Wk of the inclined portion of the case seal annular inclined surface is Wk = Ws / 2 with respect to a width Ws of the case-side annular seal surface.   5. The case according to claim 1, wherein the annular seal portion includes a case seal central inclined surface in the center of a side having the fastening fixing portion as an end point, inside the case side annular seal surface. The electronic control device according to claim 1.   8. The electronic control device according to claim 7, wherein a width dimension Wk of the inclined portion of the case seal central inclined surface is Wk = Ws / 2 with respect to a width Ws of the case-side annular seal surface. 9.   2. The annular seal portion provided with the case-side step portion or the cover-side step portion, wherein a cover inclined portion is provided inside the cover facing a sealing surface of the case-side annular seal surface. The electronic control device according to claim 1.

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