JP2020178505A - Electronic control device - Google Patents

Abstract

To provide an electronic control device capable of improving the airtightness of an annular seal portion formed at an outer peripheral position of a case and an outer peripheral position of a cover.SOLUTION: An annular seal portion (600A) formed at the outer peripheral position of a case (200A) and the outer peripheral position of a cover (300A) includes a case side annular seal surface (210), a cover side annular seal surface (310), and an annular seal material (610) filled between the case side annular seal surface (210) and the cover side annular seal surface (310), and further includes a case side stepped portion (211A) or a cover side stepped portion (311A) having a step dimension Δh protruding from the case side annular seal surface (210) or the cover side annular seal surface (310) to the convex side on the peripheral edge of the case side annular seal surface (210) or the cover side annular seal surface (310), and has a sealed structure of the annular seal portion (600A) in which the seal surfaces facing each other by the case side stepped portion (211A) or the cover side stepped portion (311A) are engaged and fastened in a bent shape with the step dimension Δh recessed.SELECTED DRAWING: Figure 5

Description

The present application relates to an electronic control device in which a circuit board is housed in a sealed housing composed of a case and a cover.

The sealed housing that is united and integrated by the case and cover that houses the circuit board is required to have a waterproof function in order to protect the circuit board that is housed inside. A waterproof sealing material is filled in the mating parts on the multiple sides of the outer peripheral position (periphery) of the case and the cover to be integrated, and the intersection of the sides is used as the fastening fixing part to fasten and integrate with the fastening related members, and the liquid etc. is sealed. A waterproof structure is formed to prevent it from entering the inside of the body.

When the electronic control device is assembled in the factory, the pressure inside and outside the sealed housing of the electronic control device is the same, but when it is transported by air, and in a high altitude environment and around the assembled environment. When the temperature is rising and the electronic control device is operating and the electronic components generate heat, the pressure inside the sealed housing rises, the pressure difference between the inside and outside of the sealed housing increases, and the sealed housing is A force from the inside due to this pressure difference acts on the constituent case and cover, and a tensile force also acts on the sealing material filled by the force trying to open the sealing surface of the mating portion between the peripheral case and the cover. It will be.

As described above, the pressure difference between the inside and outside of the sealed housing is assumed to be large when the pressure inside is higher than the pressure outside, and the durability measures for the sealing of the sealed housing are taken. is necessary.

Conventionally, the seal structure of the joint portion between the case and the cover that resists the pressure from the inside of the sealed housing is such that the tongue-shaped ridge portion provided on the cover side is inserted into the groove portion provided on the outer peripheral edge of the case to form the groove portion. It is a waterproof structure with a concavo-convex sealing surface method in which a sealing material is filled and cured in the gap between the protrusion and the ridge. The structure is such that 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 ensure the adhesive strength. It is a waterproof structure to be secured, and there are problems such as a complicated structure in which the sealing structure of the mating portion becomes uneven, and an increase in the amount of the sealing material.

According to Patent Document 1, as a solution to this problem, as a means for providing an electronic control device which is miniaturized and has sufficient adhesive strength, it is described as follows.

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

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

Further, according to Patent Document 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 the end point is such that the seal cross-sectional area at the end of the side is the same as that of the side while ensuring waterproofness. It is an electronic control device having a housing structure characterized by having a seal surface structure smaller than the cross-sectional area at the central portion. In the adhesive surface width W and the adhesive thickness G forming the seal cross section, the adhesive surface width W is set. When it is constant, 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 away from the fixed point.

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

The sealed housing, which is constructed by fastening the case and cover, has a different environment in which it is incorporated by applying an annular sealing material and the environment in which it is used as a product, and the internal pressure of the sealed housing is sealed depending on the usage environment. When the pressure is higher than the outside of the housing, a force in the direction of opening the mating portion between the case and the cover acts from the inside of the sealed housing due to the pressure difference between the inside and the outside of the sealed housing. Then, due to this force, the displacement of the members constituting the sealed housing becomes the largest at the central portion of the side whose end point is the fastening and fixing portion at the corner of the sealed housing, and the stress generated in the annular sealing material is increased. Is also the maximum.

Generally, on the flat seal surface when the case and cover are assembled, a force acts from the inside of the sealed housing so that the combination part of the sealed housing opens due to the pressure difference, and the cover side annular seal surface is deformed and the annular seal is formed. Deformation of the material occurs.

The cover is fixed to the case by the fastening related members at the fastening fixing portions at the four corners, and the cover tends to swell outward from the inside of the closed housing in a drum shape by the pressure P. The displacement of the bulge is the largest at the center of the plane of the cover, the cover-side annular seal surface is displaced in the opening direction with respect to the case-side annular seal surface, and an inclination angle is also generated.

Therefore, with the side connecting the fastening and fixing portions as a boundary, the outer side acts in the direction of pressing the annular sealing material, and the inner side displaces the annular sealing material in the pulling direction. The largest displacement and the highest stress generated on the annular sealant are at the center of the side with the fastening and fixing portion as the end point, and it is required to secure the adhesive strength of the annular sealant by the deformation suppressing structure of the annular sealant. It becomes.

Therefore, there is a method of suppressing the displacement by adding a fixing part with a fastening material to the central part of the side with a large displacement to strengthen the sealing property, but the part of the fastening fixing part is doubled and the structure of the product It is not a good idea because the product price will rise due to the complexity of the product.

Further, in Patent Document 1 described above, the groove formed at the peripheral end of the case body is filled with a sealing material, and the cover has a flat portion to be adhered to the sealing material in the groove, and is outside the case groove. A seal that abuts the stepped portion on the outer circumference and the end of the flat surface portion of the cover so that the adhesive strength of the sealing material between the case body and the cover can be held in the tensile direction, and is held at a tensile strength that is more advantageous than the shear strength. By adopting the structure, it is said that the sealing strength can be obtained without enlarging the adhesive portion.

Then, in the structure as shown in FIG. 2 of Patent Document 1, the contact portion between the stepped portion on the outer periphery of the case and the end portion of the flat portion of the cover is provided on the entire circumference. With respect to 100 μm, it is assumed that there is a variation of several hundred μm in the finished dimensions of the product between the case molded by die-casting and the case of the molded product cover by press working, and in such a state, the corresponding part is It is possible that they do not come into contact with each other.

In such a state, the deformation of the central part of the side of the sealed housing cannot be suppressed, and when a stress exceeding the strength of the annular sealing material is generated, the annular sealing material is broken and the sealing property of the sealed housing is impaired. It will be.
Further, it is assumed that the end face of the flat surface portion of the cover and the stepped portion on the outer periphery of the case are in contact with each other, so that they easily interfere with each other and it is difficult to incorporate the cover.

Further, in the case of the structure of FIG. 4 of Patent Document 1, a protrusion that engages with the flat surface portion of the cover is provided on the stepped portion on the outer periphery of the case to press the upper surface of the flat surface portion of the cover, but there are four side mating portions. To assemble a rectangular sealed housing so that the protrusions on the four sides are securely engaged with the flat surface of the cover, attach the cover to the stepped portion of the case and then bend the protrusions. There is a problem that the process becomes an engagement process, the assembly process is complicated, and the manufacturing manpower is required.

Further, in Patent Document 2 described above, the seal cross-sectional structure of each part of the side between the fastening and fixing portion between the case body and the cover is such that the seal cross-sectional area at the end of the side is the central portion of the side while ensuring waterproofness. It is an electronic control device having a sealed housing structure characterized by having a seal surface structure smaller than the cross-sectional area of the above, and the adhesive surface width is constant in the adhesive surface width W and the adhesive thickness G forming the seal cross section. If so, the cross-sectional area is changed depending on the thickness G.

However, the deformation caused by the force to open the fastening surface of the sealed housing is a deformation that inflates the cover constituting the sealed housing in a drum shape, and the mating surface is displaced in the direction of opening inside the side and annular on the outside. It is conceivable that the larger the adhesive thickness G, the larger the amount of deformation due to the displacement in the direction of pressing the sealing material, and the effect of sealing may not be obtained.

The present application discloses a technique for solving the above-mentioned problems, in which a circuit board is hermetically housed in a hermetically sealed housing composed of a case and a cover, and is located at the outer peripheral position of the case and the outer peripheral position of the cover. It is an object of the present invention to provide an electronic control device capable of improving the airtightness of the formed annular seal portion.

The electronic control device disclosed in the present application has a hermetically sealed housing composed of a case and a cover, and a connector housing that is hermetically housed inside the hermetically sealed housing and partially exposed from the opening of the case. An electron having a circuit board, 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 fastened and integrated by a fastening material at a fastening fixing portion of the outer peripheral position of the case and the outer peripheral position of the cover. In the control device, the annular seal portion includes a case-side annular seal surface at the outer peripheral position of the case, a cover-side annular seal surface at the 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 surfaces is provided, and the fastening fixing portion is provided with a fastening contact surface having a thickness Hs that is in contact with the cover-side annular sealing surface and determines the distance between the fastening sealing surfaces. The fastening seat is provided, and the fastening contact surface or the facing contact surface is provided at the center of the side having the fastening fixing portion as an end point on the peripheral edge of the case-side annular sealing surface or the cover-side annular sealing surface. A case-side step portion or a cover-side step portion having a step size Δh projecting from the case-side annular seal surface or the cover-side annular seal surface as a reference is provided, and the annular portion is provided inside the case-side step portion. It has a width and height that form a seal cross-sectional shape filled with the sealing material, and when the case and the cover are combined, the case-side stepped portion or the cover-side stepped portion first contacts the facing sealing surface. In the fastening fixing portion, when the cover is fastened to the fastening contact surface by the fastening material, the sealing surface facing the case side step portion or the cover side step portion is described as described above. It has a sealed structure of the annular seal portion that is engaged and fastened in a curved shape in a state of being bent by the step size Δh.

In the electronic control device disclosed in the present application, the circuit board is hermetically housed in a hermetically sealed housing composed of a case and a cover, and the airtightness of the annular seal portion formed at the outer peripheral position of the case and the outer peripheral position of the cover is improved. It is possible to obtain an electronic control device that can be used.

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

Embodiment 1.
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 name or reference numeral. In addition, duplicate explanations may be omitted.

FIG. 1 is a perspective view showing the appearance of the cover in the electronic control device according to the first embodiment. FIG. 2 is a perspective view showing the appearance of the case in the electronic control device according to the first embodiment.
The sealed housing 100, which serves as an electronic control device, is formed of, for example, an aluminum material having heat dissipation, in which a part of a resin connector housing 500 is mounted so as to be exposed to the outside and a circuit board 400 described later is housed. The seal surface of the die-cast case 200 and the resin or metal cover 300 for covering the outer peripheral opening of the case 200 are aligned with each other, and the sealing surface of the mating surface is formed as an annular seal portion 600. It constitutes a seal structure filled with an annular seal material 610, which will be described later. The fastening and fixing portions 110 at the four corners have a structure in which the fastening member 130 such as a screw or caulking is inserted into the fastening member insertion portion 202 to fasten and integrate the case 200 and the cover 300.

FIG. 5 is a developed perspective view showing the electronic control device according to the first embodiment of the present application. It is a developed perspective view which disassembled the closed housing which becomes an electronic control device. FIG. 6 is an enlarged perspective view showing the details of part A in FIG. 5, and FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6, showing a state in which a cover is combined with the case side.

In FIG. 5, the sealed housing 100A is configured by the case 200A and the cover 300A. The circuit board 400 is equipped 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 of the connector housing 500 is exposed from the opening 203 of the case 200A.

The circuit board 400 is housed in a sealed housing 100A composed of a case 200A and a cover 300A, and the cover 300A is housed in the case 200A by a fastening material 130 such as a screw which is a fastening related member 120 at the fastening fixing portion 110 at the four corners. It is fixed to and integrated with each other to form a closed housing 100A.

The outer peripheral portion of the outline of the connector housing 500 exposed from the opening 203 of the case 200A is waterproofed and sealed by the coated connector portion sealing material around the opening 203.

Further, as shown in the enlarged perspective view of FIG. 6, a fastening fixing portion 110 at a corner for fastening the case 200A and the cover 300A is set as an end point at the central portion of the case-side annular seal 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 the peripheral end portion of the case-side annular seal surface 210 at the central portion C210 of the side. As an example, the case-side step portion 211A is arranged symmetrically with respect to the central portion C210 of the side having the fastening fixing portion 110 as an end point.

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

As described above, the outer peripheral end portion of the central portion of the plurality of sides of the case-side annular seal surface 210 of the case 200A has a case-side step portion 211A for facing the cover-side annular seal surface 310 to be combined. A semi-fluid and viscous annular sealing material 610 is applied to the sealing surface having a width Ws excluding the case-side step portion 211A and the continuous case-side annular sealing surface 210.

Then, in the fastening fixing portion 110, the fastening material 130 such as a screw, tapping screw, and caulking is inserted into the fastening material insertion portion 202, and the cover-side annular seal surface 310 is brought to the height Hs of the fastening contact surface 201S of the fastening seat 201. At the time of pressing and fixing, the annular seal material 610 applied to the case-side annular seal surface 210 fills and fits between the case-side annular seal surface 210 and the cover-side annular seal surface 310, and then the annular seal material 610 is applied. The mating surface of the case 200A and the cover 300A that has been cured has a sealed structure that becomes an annular seal portion 600A that is adhesively integrated with the annular seal material 610.

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

FIG. 8 shows the thickness of the cover 300A larger than the thickness of the cover 300A of FIG. 7, and FIG. 9 shows the concave case-side annular seal surface 210a and the concave cover-side annular seal surface 310a. FIG. 10 shows a stepped case-side annular seal surface 210b. As described above, the shape of the annular seal surface 210 of the case 200A and the annular seal surface 310 of the cover 300A may be either a flat shape or an uneven shape, and the inside of the case side step portion 211A or the cover side step portion 311A is annular. Any cross-sectional shape may be used as long as the sealing material 610 is filled and 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 according to the first embodiment of FIG. The case 200A and the cover 300A are combined in a state where the cover-side annular seal surface 310 is in contact with the upper surface of the case-side step portion 211A, and the step dimension between the fastening contact surface 201S is Δh. FIG. 12 is a cross-sectional view taken along the 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 seal surface 210, and the height of the case-side step portion 211A is Ht from the case-side annular seal surface 210. is there.

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

In FIG. 13, the cover-side stepped portion 311A is provided at the outer peripheral end of the cover-side annular seal surface 310, and the step dimension protruding from the contact surface of the cover-side annular seal surface 310 that abuts the fastening contact surface 201S to the convex side. It is Δh, and the height is Ht, and the shape is such that it comes into contact with the facing case-side annular seal surface 210.

In FIG. 14, the step portion is provided as the case side step portion 211A1 and the cover side step portion 311A1 at the outer peripheral end portions of the case side annular seal surface 210 and the cover side annular seal surface 310, respectively. When the portion 211A1 and the cover-side step portion 311A1 are combined, as shown in the embodiment of FIG. 12, the step size Δh projectes to the convex side with respect to the contact surface of the fastening contact surface 201S. In FIG. 14, the heights of the case-side step portion 211A1 and the cover-side step portion 311A1 are set to Ht / 2, respectively, with respect to the step portion height Ht. When it is desired to secure the strength of the outer peripheral edge of the cover with a thin metal press-molded cover, it is considered useful to have a structure in which a step portion is provided as a cover side step portion 311A1 on the cover side annular sealing surface 310.

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

The cover-side annular seal surface 310 is pushed and fastened to the contact surface of the fastening contact surface 201S of the fastening seat 201 by the fastening member 130. The height Hs of the fastening contact surface 201S is the thickness of the annular sealing material 610 in the vicinity of the fastening fixing 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 facing cover-side annular seal surface 310. In the fastened state, the cover-side annular seal surface 310 is fixed at the position of the fastening fixing portion 110 with both ends of the case-side step portion 211A having a length Lt and a height Ht as contact points. ..

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

The cover 300A can be manufactured by pressing a metal such as iron or aluminum into a thin-walled shape, and even under the condition of bending and fixing by several hundred μm, there is no problem in strength within the allowable range of elastic deformation. Details of the engaged state of the seal surface in contact with the step portion will be described with reference to FIG. 18 described later.

FIG. 16 is a cross-sectional view showing another modified form 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 stepped portion 211A shown in FIG. 16, the stepped portions are divided and arranged on the left and right sides with the contact point with the cover-side annular seal surface 310 at the same position. The case-side stepped portion 211B1 and the case-side stepped portion 211B2 are divided into two parts. Similar to FIG. 15, the step portion and the surface of the fastening contact surface 201S have a step size Δh protruding to the convex side. Although there is a space between the case-side stepped portion 211B1 and the case-side stepped portion 211B2 which are separately arranged on the left and right, the cover-side annular seal surface 310 is the case-side stepped portion 211B1 and the case side as in the first embodiment described above. The annular seal portion 600A is engaged with both ends of the step portion 211B2 as contact points.

FIG. 17 is a cross-sectional view showing another modified form of FIG. 15 in the electronic control device according to the first embodiment, and is a case-side step portion 211B1 and a case-side step portion separately arranged on both sides with respect to the modified form of FIG. In addition to the 211B2, the case-side step portion 211C is provided at the central portion between the case-side step portion 211B1 and the case-side step portion 211B2. That is, it is divided into three parts, both ends and the center.

Then, the cover-side annular seal surface 310 is abutted and fastened at the end points of the case-side stepped portion 211B1 and the case-side stepped portion 211B2, and the shape of the deflection in the central portion and the case-side stepped portion 211C in the central portion are abutted and fastened. The step size is Δhc so as to abut.

FIG. 18 is an enlarged side view showing the details of the portion B of FIG. 15 in the first embodiment, showing a state in which the case 200A and the cover 300A are fastened and combined. The configuration is as shown in FIG. 15, and the sealing surfaces facing each other at both ends of the case-side step portion 211A are engaged and supported. Although there is a flexible shape surface and a gap in the central portion, the inside of the case side step portion 211A is a part of the sealing surface, and the coated annular sealing material 610 is filled, and the waterproof property is not impaired.

FIG. 19 is an enlarged side view showing the details of the portion C of FIG. 17 in the first embodiment, showing a state in which the case 200A and the cover 300A are fastened to each other. The configuration is as shown in FIG. 17, and the step of the case-side step portion 211C in the center has a step dimension Δhc with the surface of the fastening contact surface 201S larger than the step dimension Δh of the case-side step portions 211B1 at both ends. It is large, and the step size is set along the bending shape of the step size Δh by the fastening member 130 at the fastening fixing portion 110 from the state where the cover side annular seal surface 310 is in contact with the case side step portion 211B1.

Therefore, the cover-side annular seal surface 310 is in contact with each other at both the case-side stepped portion 211B1, the case-side stepped portion 211B2, and the case-side stepped portion 211C, and is engaged and fixed, and the integrated case according to the first embodiment. The inclination of the sealing surface that comes into contact with the side step portion 211A is suppressed at the central portion of the side, and a more effective sealing structure of the annular sealing portion 600A can be 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. I will do it.

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

FIG. 3A is a cross-sectional view of the case 200 and the cover 300 assembled when the thickness of the annular sealing material 610 is Tss. FIG. 3B shows the pressure inside the sealed housing being higher than that outside. It is a figure which showed the deformed state of the cover 300 and the annular seal material 610 in the state which the force is acting so that the mating part of a closed housing is opened by a pressure difference.

The cover 300 is fixed to the case 200 by the fastening material 130 at the fastening fixing portions 110 at the four corners, but 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 sealed housing 100. The largest displacement occurs at the center of the surface of the cover 300 surrounded by the fixed portions at the four corners, and the cover-side annular sealing surface 310 is displaced in the opening direction from the case-side annular sealing surface 210, and FIG. As shown in the cross-sectional view of the above, deformation occurs with an inclination of an angle θab with respect to the case-side annular seal surface 210.

Therefore, the annular sealing material 610, which is an elastic body, is compressed by the inclination of the sealing surface on the outside and in the tensile direction due to the displacement by the pressure P and the inclination of the sealing surface on the outside with the side with each fastening fixing portion 110 as the end point. It is displaced and the displacement is greatest at the center of the side.

Further, FIG. 4A shows a state in which the case 200 and the cover 300 are assembled in the case of Tsd by increasing the thickness of the annular sealing material 610 from the structure of FIG. 3A with the aim of improving the adhesive strength of the sealing material. It is a cross-sectional view in.

FIG. 4B shows a state in which the pressure inside the sealed housing 100 is higher than that outside the outside as in FIG. 3B, and a force is applied so as to open the mating portion of the sealed housing 100 due to the pressure difference. It is a figure.

The action of the cover 300 to bulge outward in a drum shape due to the pressure difference P between the inside and outside of the sealed housing 100 is the same as in FIG. 3B, but the case side of the cover-side annular seal surface 310 at the center of the side. The inclination of the annular sealing surface 210 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 Tss <Tsd. Therefore, the inclination of the covering-side annular sealing surface 310 is θab <θcd. Therefore, the effect of suppressing the deformation of the annular sealing material 610 is small, and it can be said that the means for increasing the thickness of the annular sealing material 610 for improving the adhesive strength of the annular sealing material 610 has little effect of improving the sealing performance.

20A and 20B are cross-sectional views showing an annular seal portion in the electronic control device according to the first embodiment, FIG. 20A is a cross-sectional view showing a state in which internal pressure is not applied, and FIG. 20B shows a state in which internal pressure is applied. It is a sectional view. FIG. 20B is a view showing a cross section of the annular seal portion 600A in a state where the cover-side annular seal surface 310 facing the case-side step portion 211A is engaged with the case-side step portion 211A in FIG. 20 (a). It shows the state of the cover-side annular sealing surface 310 in a state where the pressure P different from the outside air is acting from the inside of the cover side.

The cover 300A receives a force due to the pressure P so that the central portion of the surface swells like a drum, but the cover-side annular seal surface 310 has a case-side step portion 211A having a convex step dimension Δh on the convex side with the fastening contact surface 201S. It is engaged with the rigid body of the above in a shape that is bent by the step size, and the deformation is limited to the inclination angle θt with respect to the case-side annular seal surface 210.

This inclination angle θt is θt <θab as compared with the case where there is no step portion, for example, FIG. 3B, and the action of deforming the annular sealing material 610, which is an elastic body, is suppressed, and the fastening is performed. It is possible to obtain an electronic control device having an optimum sealed structure of the annular sealing portion 600A that can secure the adhesive strength for the annular sealing material 610 in which the displacement of the surface is suppressed.

Next, the features of each embodiment and the claims will be described. The electronic control device according to claims 1 and 2 in this embodiment is a case 200A and a cover 300A in which a circuit board 400 on which a resin connector housing 500 is mounted is hermetically housed in a sealed housing 100A. A fastening seat 201 is provided on the fastening fixing portion 110 at the four corners of the outer periphery of the 300A, and a half is provided 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. An annular sealing material 610, which is an elastic body due to its fluidity and viscous characteristics, is filled, and when the case 200A and the cover 300A are fastened and integrated, the thickness of the annular sealing material 610 in the vicinity of the fastening fixing portion 110 is the fastening seat 201. It will be secured by the height of the fastening contact surface 201S.

Further, 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, they are the fastening surfaces of the case 200A and the cover 300A. Internal pressure acts on the case-side annular seal surface 210 and the cover-side annular seal surface 310 at the outer peripheral position in the opening direction, and the displacement is maximized at the center C210 position of the side with the fastening fixing portion 110 as the end point. At the peripheral end portions 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 facing seal surfaces when the case 200A and the cover 300A are combined are provided. The step portion 211A on the case side or the step portion 311A on the cover side is a step having a step size of Δh with the fastening contact surface 201S of the fastening seat 201, and the annular sealing material 610 is applied to the fastening surface at the outer peripheral position. Will be done.

After that, when the fastening member 130 pushes and fixes the fastening seat 201 to the fastening contact surface 201S at the position of the fastening fixing portion 110, the fastening surface formed by the sealing surface facing the case side step portion 211A or the cover side step portion 311A becomes The step size Δh is engaged in a bent shape, and the fastening surface is integrated in a bent shape corresponding to the strength.

By setting the step dimension Δh in consideration of the dimensional tolerance of the parts, it is necessary to take the most measures against airtightness without cutting the step height Ht of the case 200A and the cover 300A with high accuracy. The case 200A and the cover 300A can be brought into contact with each other at a certain center position of the 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 are engaged and fastened are strengthened in rigidity, and the case-side annular seal surface 210 and the cover-side annular seal surface 310 are deformed to open due to internal pressure. Is suppressed, and the amount of tensile deformation and the generated stress of the annular seal material 610 inside the case side annular seal surface 210 and the cover side annular seal surface 310 are reduced without pressing the annular seal material 610. The durability of the airtightness of the part 600A can be improved.

Since the structure can suppress the amount of deformation of the annular sealing material 610, it is easy to optimize the thickness of the annular sealing material 610, and there is an effect that the amount of the annular sealing material 610 used can be reduced.

Further, the structure in which the seal surface facing the step portion provided on the seal surface at the outer peripheral position of the case 200A or the cover 300A is engaged and integrated has an annular sealing material inside the case side step portion 211A or the cover side step portion 311A. A combination of sealing surfaces having a cross section for ensuring the adhesive strength of 610 is sufficient, and a processing step requiring flatness and parallelism of the sealing surfaces is unnecessary. The structure of the present application is the case side annular sealing surface 210 of the case 200A and the cover. Since the 300A does not have a complicated sealing structure in which a concave groove and a convex protrusion are formed on the cover-side annular sealing surface 310, there is an effect that the manufacturing price can be reduced.

The cross-sectional area of the annular sealing material 610 on the fastening surface is designed to have sufficient adhesive strength under the conditions in which the electronic control device is used, but the thickness of the annular sealing material 610 is fastened in the vicinity of the fastening fixing portion 110. The height of the fastening contact surface 201S of the seat 201 can be determined, the process control of the coating amount of the annular seal material 610 in the assembly process is easy, and the variation in the thickness of the annular seal material 610 in the assembly can be suppressed. It also has the effect of stabilizing the quality of the airtightness of the annular seal portion 600A.

In relation to claims 3 and 4 of the electronic control device in this embodiment, the central portion C210 of the side having the case-side step portion 211A or the cover-side step portion 311A as the end point is symmetrically divided and arranged. A sealed housing 100A having a structure of an annular seal portion 600A, and when the case 200A and the cover 300A are combined, the step portion 211A on the case side or the step portion on the cover side has a step dimension of Δh from the fastening contact surface 201S. When the 311A and the facing sealing surface first come into contact with each other and then pushed and fixed by the fastening member 130 at the fastening fixing portion 110, the case-side annular sealing surface 210 and the cover-side annular sealing surface 310 to be fastened and integrated are the fastening seats. It is engaged and integrated with the fastening contact surface 201S of 201 in a shape bent by a step size Δh.

Then, the case-side stepped portions 211B and 211C or the cover-side stepped portions 311B and 311C (not shown) come into contact with the flexible shape, so that the case-side annular seal surface is further more than that of the embodiment of claims 1 and 2. 210, the cover-side annular seal surface 310 has been reinforced in rigidity, so that the cover-side annular seal surface 310 does not press the annular seal material 610 due to deformation that tends to open due to internal pressure, and displacement in the opening direction is also suppressed. At the same time, the amount of tensile deformation and the generated stress of the annular sealing material 610 can be reduced, and the durability of the sealing performance of the annular sealing portion 600A can be improved.

Since the structure can suppress the amount of deformation of the annular sealing material 610, it is easy to optimize the thickness of the annular sealing material 610, and there is an effect that the amount of the annular sealing material 610 used can be reduced. Further, by separately arranging the case-side step portions 211B and 211C or the cover-side step portions 311B and 311C (not shown) at necessary positions, there is an effect of reducing the manufacturing price by reducing the material.

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 as targets, but the present invention is not limited to this, and the cover side step portion 311A is also similarly described. It may be divided into a plurality of parts, and may be divided into two parts, a cover-side step portion 311B1 (not shown) and a cover-side step portion 311B2 (not shown), or a cover-side step portion 311B1 (not shown). The cover-side step portion 311C (not shown) may be arranged separately between the cover-side step portion 311B2 (not shown) and the cover-side step portion 311B2 (not shown), and the same effect can be obtained. Alternatively, the case side step portion 211A, the case side step portion 211B, the case side step portion 211C, the cover side step portion 311B1 (not shown), the cover side step portion 311B2 (not shown), and the cover side step portion 311C (FIG. (Not shown) may be provided, and the same effect can be obtained.

Embodiment 2.
Hereinafter, the 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 taken along the line XX of FIG. 21 showing the electronic control device according to the second embodiment, FIG. 22A is a cross-sectional view showing a state in which no internal pressure is applied, and FIG. 22B is a cross-sectional view showing a state in which internal pressure is applied. It is sectional drawing which shows the state. FIG. 23 is a perspective view showing another modification of FIG. 21 in the electronic control device according to the second embodiment. FIG. 24 is a cross-sectional view taken along the line YY of FIG. 23 showing the electronic control device according to the second embodiment, (a) is a cross-sectional view showing a state in which no internal pressure is applied, and (b) is an internal pressure applied. It is sectional drawing which shows the state. The structure, action, and features thereof will be described with reference to FIGS. 21 to 24.

FIG. 21 shows a seal surface structure in which the case 200B is used and the case seal annular inclined surface 212 is provided on the entire inner circumference of the case side annular seal surface 210 with respect to the first embodiment of the case 200A which is the subject of the present application. Is. The inclined shape of the case seal annular sealing surface 212 may be formed by a straight line or a curved line as long as it is smoothly connected to the case-side annular sealing surface 210.

FIG. 22A shows a case seal annular inclined surface 212 having an inclined surface connected to the case side annular seal surface 210 of the case 200B provided on the entire circumference, and the sealing portion at the center of the side having the fastening fixing portion 110 as an end point. In the cross-sectional view, FIG. 22B shows a deformed state of the seal surface in a state where the pressure P inside the closed housing 100B in the second embodiment is applied.

The thickness of the annular seal material 610 in the cross section of the case-side step portion 211A is the sum of the inclination height Hsk of the case seal annular inclined surface 212 and the height Ht of the case-side step portion 211A from the case-side annular seal surface 210. It is a sealed structure with an annular seal portion 600B having a thick thickness.

Since the cover-side annular seal surface 310 facing the case-side step portion 211A is engaged and fixed in a flexible shape having a step dimension Δh with the surface of the fastening contact surface 201S at the time of fastening, the cover-side annular seal surface 310 Is suppressed from being tilted with respect to the case-side annular seal surface 210.

In the cross-sectional view of FIG. 22A, the annular seal material 610 is an annular seal material in which the height Hsk of the inclined surface and the height Ht of the step portion 211A on the case side are added to the innermost part of the case seal annular inclined surface 212. The thickness is 610, which has the effect of suppressing the deformation rate of the annular sealing material 610 and has a structure in which the airtightness is improved.

As described above, in relation to claims 5 and 6 of the electronic control device in this embodiment, the inner annular seal material 610 on the case seal annular inclined surface 212 connected to the seal surface provided inside the case side annular seal surface 210. The thickness of is thicker than the seal thickness of the flat seal surface in consideration of the inclination height.

Then, under the condition that the closed housing 100B receives an internal pressure load, the cover 300B restrained by the fastening and fixing portions 110 at the four corners of the outer periphery of the closed housing 100B swells from the center of the surface to the apex and is deformed. In response to this deformation, the inner part of the cover-side annular sealing surface 310 is deformed on the pulling side, but the same amount of displacement is obtained because the relationship is that the thickness of the annular sealing material on the flat sealing surface <the thickness of the annular sealing material on the inclined surface. The rate of deformation of the annular sealing material 610 with respect to the relative is smaller than that of the flat sealing surface, which has the effect of suppressing the deformation rate of the annular sealing material 610, and can improve the resistance of the annular sealing portion 600B to the internal pressure load of the sealed housing 100B. There is a feature that becomes.

Further, the case seal annular inclined surface 212 of the case side annular sealing surface 210 may have an inclined surface inside starting from the root of the case side step portion 211A, but the amount of sealing material used increases due to the large inclined cross-sectional area. It will increase and the economic efficiency will deteriorate. Further, since the deformation of the sealing material is small in the vicinity of the root of the step portion 211A on the case side, the effect of improving the waterproof property is small even if an inclined surface is installed.

By appropriately setting the dimensions of the case seal annular inclined surface 212, it is possible to improve the adhesive strength of the sealing surface portion and improve the waterproof strength while suppressing the amount of the annular sealing material 610 used.

FIG. 23 is a modification of the case 200B, which is the subject of the present application, with respect to the second embodiment, centering on the central portion C210 of the side where the inclined surface smoothly connected to the case-side annular seal surface 210 has the fastening fixing portion 110 as an end point. The structure of the seal surface is symmetrically formed with the case seal central inclined surface 213 having a length Lk.

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

The thickness of the annular seal material 610 in the cross section of the case-side step portion 211A is the sum of 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 seal surface 210. It is a sealed structure with an annular seal portion 600B having a thick thickness.

Since the cover-side annular seal surface 310 facing the case-side step portion 211A is engaged and fixed in a flexible shape having a step dimension Δh with the surface of the fastening contact surface 201S at the time of fastening, the cover-side annular seal surface 310 Is suppressed from being tilted with respect to the case-side annular seal surface 210.

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

As described above, in relation to claims 7 and 8 of the electronic control device in this embodiment, the case side of the central portion is symmetrically centered on the central portion of the side having the fastening and fixing portion 110 of the sealed housing 100B as an end point. The thickness of the inner annular seal material 610 on the case seal central inclined surface 213 having a length of Lkt in the side direction with respect to the annular seal surface 210 is thicker than the seal thickness of the flat seal surface in consideration of the inclined height. ..

Then, under the condition that the closed housing 100B receives an internal pressure load, the cover 300B restrained by the fastening and fixing portion 110 at the corner of the outer periphery of the closed housing 100B swells and deforms with the center of the surface as the apex. In response to this deformation, the inner part of the cover-side annular seal surface 310 acts on the pulling side, but since the relationship is that the thickness of the annular seal material on the flat seal surface <the thickness of the annular seal on the inclined surface, the same displacement amount is applied. The deformation rate of the annular sealing material 610 is smaller than that of the flat sealing surface, which has the effect of suppressing the deformation rate of the annular sealing material 610, and can improve the resistance of the annular sealing portion 600B to the internal pressure load of the sealed housing 100B. There is a feature.

Further, by providing the case seal central inclined surface 213 at the central portion of the side having the fastening fixing portion 110 as an end point and having the largest deformation action, the annular seal is provided with respect to the embodiment related 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.

In FIGS. 21 to 24 described above, the case where the case seal annular inclined surface 212 or the case seal central inclined surface 213 is connected to the case side annular seal surface 210 has been described, but the present invention is not limited to this. The annular inclined surface 212 or the case seal central inclined surface 213 may be provided connected to the cover-side annular seal surface 310, and the same effect can be obtained.

Embodiment 3.
Hereinafter, the electronic control device according to the third embodiment of the present application will be described. FIG. 25 is a cross-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 modified form of FIG. 24 in the electronic control device according to the third embodiment. The structure, action, and features thereof will be described with reference to FIGS. 25 to 27.

FIG. 25 shows a sealed structure of the annular seal portion 600C provided with the cover inner inclined surface 312 inside the cover 300C with respect to the first embodiment of the case 200A which is the subject of the present application, as in the second embodiment described above. This is effective for a case 200C or the like which does not have a sufficient wall thickness to provide an inclined surface on the case-side annular seal surface 210.

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

The innermost thickness of the annular seal material 610 in the case of FIG. 27 is the total thickness Hss of the height Ht of the step portion 211A on the case side and the height Hsk of the cover inner inclined surface 312, and the annular seal in the case of FIG. 25. The innermost thickness of the material 610 is the sum of the height Ht of the step portion 211A on the case side, 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. It is Hss, and the structure of the case 200C and the cover 300C and the structure of the annular seal portion 600C according to the shape can be adopted.

FIG. 27 shows a 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 in combination. In the case where the case-side annular seal 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, it has a function as a case-side step portion 211A. Therefore, when the facing cover-side annular seal surface 310 is fastened, the step size of the cover-side annular seal surface 310 is pushed into the fastening contact surface 201S of the fastening seat 201 at the fastening fixing portion 110, and the fastening member 130 is used. It will be fixed, and the case-side step portion 211A and the cover-side annular seal surface 310 are engaged and fixed.

As described above, in relation to the ninth aspect of the electronic control device in this embodiment, since the annular seal material 610 is also filled in the cover inner inclined surface 312 provided inside the cover 300C, the thickness of the annular seal material 610 is increased. The innermost part of the seal surface has a thickness that takes into account the inclination height of the cover inner inclination portion 312.

Then, under the condition that the closed housing 100C receives an internal pressure load, the cover 300C restrained by the fastening and fixing portions 110 at the four corners of the outer periphery of the closed housing 100C swells from the center of the surface to the apex, causing deformation. In response to this deformation, the inner part of the cover-side annular seal surface 310 acts on the pulling side, but the same displacement because the relationship is such that the thickness of the annular seal material on the flat seal surface <the seal thickness on the inner inclined surface of the cover. The ratio of deformation of the annular sealing material 610 to the amount is smaller than that of the flat sealing surface, which has the effect of suppressing the deformation rate of the annular sealing material 610, and can improve the resistance of the sealing portion to the internal pressure load of the sealed housing 100C. There is a feature.

Further, the structure of the annular seal portion 600C is composed of a case-side step portion 211A or a cover-side step portion 311A provided on the case-side annular seal surface 210 or the cover-side annular seal surface 310, and an inclined portion of the cover inner inclined surface 312. Since the sealing can be achieved with a simple structure having a filled cross-sectional structure of the annular sealing material 610, there is an effect of suppressing the manufacturing price.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

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

100 sealed housing, 100A sealed housing, 100B sealed housing, 100C sealed housing, 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 seal surface, 210a case side annular seal surface, 210b case side annular seal surface, 211A case side step portion, 211A1 case side step portion, 211B1 case side step portion, 211B2 case side step portion, 211C Case side stepped portion, 212 Case seal annular sealing 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 part, 400 circuit board, 500 connector housing, 600 annular seal part, 600A annular seal part, 600B annular seal part, 600C annular seal part

Claims (9)

A closed housing composed of a case and a cover, and a circuit board having a connector housing that is hermetically stored inside the closed housing and partially exposed from an opening of the case, and is provided with an outer circumference of the case. An electronic control device in which an annular seal portion is formed at a position and an outer peripheral position of the cover, and is fastened and integrated by a fastening material at a fastening fixing portion at the outer peripheral position of the case and the 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. Equipped with a ring-shaped sealing material
The fastening fixing portion includes a fastening seat having a fastening contact surface that is in contact with the cover-side annular seal surface and has a thickness Hs that determines the distance between the fastening seal surfaces.
On the peripheral portion of the case-side annular seal surface or the cover-side annular seal surface, the case side is based on the fastening contact surface or the contact surface facing the fastening contact surface at the center of the side with the fastening fixing portion as an end point. A case-side step portion or a cover-side step portion having a step size Δh protruding from the annular seal surface or the cover-side annular seal surface on the convex side is provided, and the inside of the case-side step portion is filled with the annular seal material. It has a width and a height that form 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 the facing seal surface.
In the fastening fixing portion, when the cover is fastened to the case to the fastening contact surface by the fastening material, the sealing surface facing the case side step portion or the cover side step portion is flexed by the step dimension Δh. An electronic control device having a hermetically sealed structure of the annular seal portion that is engaged and fastened in a bent 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 with respect to the center of a side having the fastening fixing portion as an end point. .. The electronic control device according to claim 1 or 2, wherein the case-side step portion or the cover-side step portion is divided into a plurality of portions. The case-side step portion or the cover-side step portion is divided into three parts, both ends and the center, and the case-side step portion or the cover-side step portion located at both ends has the step dimension Δh and is located at the center. The step portion on the case side or the step portion on the cover side has a step dimension Δhc, and the size of the step dimension Δhc is larger than the step dimension Δh, any one of claims 1 to 3. The electronic control device according to the section. The electronic control device according to any one of claims 1 to 4, wherein the annular seal portion includes a case seal annular inclined surface inside the case-side annular seal surface. The electronic control device according to claim 5, wherein the width dimension Wk of the inclined portion of the case seal annular sealing surface is Wk = Ws / 2 with respect to the width Ws of the case side annular sealing surface. Claims 1 to 4, wherein the annular seal portion is provided with a case seal central inclined surface at 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 any one of the following items. The electronic control device according to claim 7, wherein the width dimension Wk of the inclined portion of the central inclined surface of the case seal is Wk = Ws / 2 with respect to the width Ws of the annular seal surface on the case side. Claim 1 is characterized in that, in the annular seal portion provided with the case-side step portion or the cover-side step portion, the cover inclined portion is provided inside the cover facing the seal surface of the case-side annular seal surface. The electronic control device according to any one of claims 8.

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