阅读说明：本技术 电子控制装置 (Electronic control device ) 是由 药泽健太 执行俊和 于 2019-08-27 设计创作，主要内容包括：本发明课题为提供具有在产生腐蚀的环境下抑制镀层的腐蚀并对基板侧进行完全密封的构造的电子控制装置。电子控制装置(1)具有：印刷布线基板(10),其设置有电子部件；外壳(20),其收容有印刷布线基板(10)；以及罩(22),其设置于外壳(20),在外壳(20)与罩(22)之间具有使各自的表面对置地经由密封材料(28)连接的接合面,在接合面设置有贯通罩(22)或者外壳(20)的螺钉(30),在设置有螺钉(30)贯通的贯通孔的外壳(20)或者罩(22)的表面设置有镀层(24),在外壳(20)或者罩(22)的内侧且比贯通孔靠外壳(20)的内部侧,具有镀层(24)部分地被剥落而形成的母材的露出部(25a),密封材料(28)浸入至母材的露出部(25a)。(The invention provides an electronic control device having a structure for inhibiting corrosion of a plating layer under an environment where corrosion occurs and completely sealing a substrate side. An electronic control device (1) is provided with: a printed wiring board (10) on which electronic components are provided; a housing (20) which houses the printed wiring board (10); and a cover (22) provided to the housing (20), wherein a joint surface is provided between the housing (20) and the cover (22) and the surfaces of the joint surface are opposed to each other and connected by a sealing material (28), a screw (30) penetrating the cover (22) or the housing (20) is provided at the joint surface, a plating layer (24) is provided on the surface of the housing (20) or the cover (22) provided with a through hole through which the screw (30) penetrates, an exposed portion (25a) of a base material formed by partially peeling off the plating layer (24) is provided on the inner side of the housing (20) or the cover (22) and on the inner side of the housing (20) than the through hole, and the sealing material (28) is immersed in the exposed portion (25a) of the base material.)

1. An electronic control device, comprising:

a printed wiring board on which an electronic component is provided;

a housing that houses the printed wiring board; and

a cover disposed at the housing,

between the housing and the cover there are joining surfaces with their respective surfaces facing each other and joined by means of an adhesive material,

a screw is provided on the joint surface, the screw penetrating the cover or the housing,

a plating layer is provided on the surface of the housing or the cover having a through hole through which the screw passes,

an exposed portion of a base material formed by partially peeling off the plating layer is provided inside the case or the cover and inside the case from the through hole,

the sealing material is impregnated into the exposed portion of the base material.

2. The electronic control device according to claim 1,

a processed part is provided inside the cover to form an exposed part of the base material formed by partially peeling off the plating layer,

the sealing material is impregnated into the exposed portion of the base material.

3. The electronic control device according to claim 1,

the cover has an exposed portion of a base material formed by partially peeling off the plating layer by providing a one-step drawing of a contact portion between the inside of the cover and the housing base,

the sealing material is impregnated into the exposed portion of the base material.

4. The electronic control device according to claim 1,

a concave processing part of a circular groove is arranged in a mode of surrounding the contact part of the inner side of the cover and the shell base, so that the exposed part of the base material formed by partially peeling the coating layer is provided,

the sealing material is impregnated into the exposed portion of the base material.

5. The electronic control device according to claim 1,

a recessed processing part of a triangular groove is provided so as to surround a contact part between the inside of the cover and the housing base, and the exposed part of the base material formed by partially peeling the plating layer is provided,

the sealing material is impregnated into the exposed portion of the base material.

6. The electronic control device according to claim 1,

the cover has an exposed portion of a base material formed by partially peeling off the plating layer by providing a string-like uneven work on the case inside of a contact portion surface between the cover and the case base,

the sealing material is impregnated into the exposed portion of the base material.

7. The electronic control device according to claim 1,

the cover is provided with a processing for coating crack inside, so as to have an exposed part of the base material formed by partially peeling off the coating layer,

the sealing material is impregnated into the exposed portion of the base material.

8. The electronic control device according to claim 1,

the cover has an exposed portion of a base material formed by partially peeling the plating layer by providing a scribing process for removing the plating layer on the case inside side of a contact portion surface between the cover and the case base,

the sealing material is impregnated into the exposed portion of the base material.

9. The electronic control device according to claim 1,

the cover has an exposed portion of a base material formed by partially peeling off the plating layer by providing a sand treatment process for removing the plating layer on the case inside side of a contact portion surface between the cover inside and the case base, and the sealing material is impregnated into the exposed portion of the base material.

Technical Field

An electronic control device.

Background

There are many demands for electronic control devices mounted in engine rooms, such as water resistance, heat resistance, corrosion resistance, and EMC. Further, the product is required to have a long life, and it is necessary to ensure operation in such a use environment, which is difficult to satisfy at low cost.

Further, as the function of the vehicle is improved, the size of the control device is increased, and an inexpensive and high-quality design is required. The size of the sealing material increases, and the amount of the sealing material needs to be reduced to make the sealing material inexpensive. Further, although the deformation of the control device becomes large due to the environment (thermal deformation, height change, etc.), it is necessary to reduce the stress to the seal portion and increase the length of the seal. In addition, as a measure against corrosion of a steel sheet material, a measure using a special corrosion-resistant treatment can be adopted, but it is generally not distributed in the market, and therefore it is expensive. It is necessary to use a pre-plated material having practical performance without using a special corrosion-resistant treatment.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2015-174305

Patent document 2: japanese patent laid-open No. 2016 & 569338

Disclosure of Invention

Problems to be solved by the invention

In the structure disclosed in patent document 1, the degassing at the time of curing the sealing material is released from the screw portion, and a part of the periphery of the screw portion is not completely sealed. In some cases, the screw portion of the cover is immersed in saline from the gap between the spring washers due to the principle of crevice corrosion, and is communicated with the contact surface between the cover and the housing. The coating on the surface of the back side of the hood is in contact with salt water and the coating of the steel sheet hood corrodes. The plating layer corrodes, and the sealing material falls off, thereby causing leakage at the screw portion. In general, resin embedding and water sealing screws using screws are considered to prevent the intrusion of saline water from screw portions, but these are expensive because they are special screws that are not distributed in the market due to an increase in processes, and it is difficult to implement these measures. In the structure disclosed in patent document 1, it can be said that the periphery of the screw portion is easily corroded and easily comes off. The invention aims to provide an electronic control device having a structure which inhibits the corrosion of a plating layer under an environment where the corrosion is generated and completely seals a substrate side.

Means for solving the problems

An electronic control device, comprising: a printed wiring board on which an electronic component is provided; a housing that houses the printed wiring board; and a cover provided to the case, the cover having a joint surface between the case and the cover, the joint surface being connected to each other with a sealing material interposed therebetween, a screw provided on the joint surface, the screw penetrating through the cover or the case, a plating layer provided on a surface of the case or the cover, the surface of the case or the cover being provided with a through hole through which the screw penetrates, an exposed portion of a base material formed by partially peeling off the plating layer, the base material being provided inside the case or the cover and inside the case with respect to the through hole, and the sealing material being impregnated into the exposed portion of the base material.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the cover surface is coated with a plating layer for improving corrosion resistance, and the adhesive is impregnated into the plating layer at a portion where a crack is generated, thereby preventing corrosion of the plating layer. Effects and problems other than those described above will be apparent from the following embodiments.

Drawings

Fig. 1 is a perspective view of an electronic control device according to embodiment 1 of the present invention.

Fig. 2 is a sectional view of an essential part of an electronic control apparatus according to embodiment 1 of the present invention.

Fig. 3 is a sectional view of an essential part of a cover of an electronic control apparatus according to embodiment 1 of the present invention.

Fig. 4 is a sectional view of a main part of a cover of an electronic control device according to embodiment 1 of the present invention, which is a view for explaining a crack in a plating layer.

Fig. 5 is a sectional view of a main part of a cover of an electronic control device according to embodiment 1 of the present invention, and is a view for explaining effects of the present invention.

Fig. 6 is a front view of a main part of a cover of an electronic control device according to embodiment 1 of the present invention.

Fig. 7 is a sectional view of an essential part of a cover of an electronic control apparatus according to embodiment 1 of the present invention.

Fig. 8 is a front view of a main part of a cover of an electronic control device according to embodiment 2 of the present invention.

Fig. 9 is a sectional view of an essential part of a cover of an electronic control apparatus according to embodiment 2 of the present invention.

Fig. 10 is a front view of a main part of a cover of an electronic control device according to embodiment 3 of the present invention.

Fig. 11 is a sectional view of an essential part of a cover of an electronic control apparatus according to embodiment 3 of the present invention.

Fig. 12 is a front view of a main part of a cover of an electronic control device according to embodiment 4 of the present invention.

Fig. 13 is a sectional view of an essential part of a cover of an electronic control apparatus according to embodiment 4 of the present invention.

Fig. 14 is a front view of a main part of a cover of an electronic control device according to embodiment 5 of the present invention.

Fig. 15 is a front view of a main part of a cover of an electronic control device according to embodiment 6 of the present invention.

Detailed Description

Hereinafter, the configuration and the operation and effects of the electronic control device according to embodiments 1 to 6 of the present invention will be described with reference to the drawings. The electronic control device controls, for example, an engine, a transmission, and the like. In the drawings, the same reference numerals denote the same parts.

Example 1

Fig. 1 is a perspective view of an electronic control device 1 according to embodiment 1 of the present invention. In addition, electronic components and the like mounted on the substrate are omitted for easy visibility of the drawings.

As shown in fig. 1, the electronic control device 1 mainly includes a printed wiring board 10, a housing 20, a cover 22, and 3 connectors 32.

The printed wiring board 10 has electronic components and the like mounted thereon. The housing 22 protects the printed wiring substrate 10. In the housing 20, at least 3 wide openings 21 through which the connectors 32 are inserted are provided on a flat surface.

The cover 22 is fixed to the housing 20, and seals the opening 20b of the housing 20. The connector 32 is electrically connected to the printed wiring board 10. The sealing material 28 seals the gap between the opening edge 20c of the housing 20 and the inner surface of the peripheral edge 22d of the cover 22. The sealing member 28 seals the space between the housing groove 32d of the connector 32 and the projections around the plurality of wide openings of the housing 20.

The printed wiring board 10 is fixed to the housing 20 by screws 31. Here, the heat dissipation adhesive 29 is interposed between the printed wiring board 10 and the case 20. The cover 22 is fixed to the housing 20 with screws 30.

The housing 20 accommodates the printed wiring board 10 therein in conformity with the cover 22, and protects the printed wiring board 10 mounted with the electronic components from water, foreign substances, and the like. The housing 20 is preferably made of metal, preferably aluminum, for radiating heat generated by the electronic component and shielding noise. The housing 20 is formed by aluminum die casting using a die.

In the case of the electronic control device 1 configured by electronic components that do not require heat dissipation or shielding, the material of the housing 20 may be resin. In the case of resin, the housing 20 is molded by injection molding.

As shown in the drawing, the outer shape of the housing 20 is 240mm × 160mm, and the electronic control device 1 disposed in the engine room has a relatively large size and a rectangular shape.

As shown in the drawing, a peripheral edge portion 22d is provided on the entire inner peripheral portion of the cover 22. A sealing material 28 is applied between the peripheral edge portion 22d of the cover 22 and the opening edge portion 20c of the housing 20, thereby protecting the electronic components from foreign matter such as salt water.

The material of the cover 22 is preferably an iron-based or aluminum-based steel plate, but may be resin or aluminum die-cast. In the case of metal, the electromagnetic wave is not affected to the outside. In addition, the electromagnetic wave is not affected by other objects.

The sealing material 28 is preferably a silicon adhesive material. In particular, the deformation of the center of the long side of the housing 20 is maximized because the long side of the housing 20 is deformed by the internal pressure applied to the housing 20 due to the change in pressure inside the housing 20 caused by the change in temperature and the center of the housing 20 is deformed to bend outward. Therefore, the sealing material 28 has an adhesive force capable of withstanding deformation.

Cover through holes 22b through which screws 30 fixed to the housing 20 are inserted are provided at four corners of the cover 22. The cover 22 and the housing 20 are fixed together with the sealing material 28 by screws 30. It is preferable to arrange the screws 30 at the four corners of the cover 22 to avoid the complicated application trace of the sealing material 28. In the present embodiment, since the size is 1.5 times larger than that of the conventional electronic control device 1, a thin material is selected as the cover 22, and a rib, a small recess, a step, and the like are provided to secure strength.

Fig. 2 is a sectional view of an essential part of an electronic control device 1 according to embodiment 1 of the present invention.

In order to fit the housing 20 and the cover 22, the screws 30 are passed through the housing through-holes 20d and the cover through-holes 22b provided in the housing and the cover. To prevent loosening, a spring washer 30a and a flat washer 30b are sandwiched between the screws 30. In order to dispense out the degassing generated when the sealing material 28 is cured, a degassing discharge portion 20a is provided in the housing through hole 20d and the cover through hole 22 b.

Since the brine enters from the degassing discharge part 20a, the sealing material 28 is provided on the cover inner side 22c closer to the sealed space than the cover through hole, thereby preventing the brine from entering.

Fig. 3 is a sectional view of an essential part of a cover 22 of the electronic control device 1 of embodiment 1 of the present invention. In the cover 22, a plating layer 24 having a thickness of about several tens of micrometers is applied to the cover base material 25. In addition, in order to prevent the plating layer 24 from being oxidized, the surface of the plating layer 24 is subjected to a chemical conversion treatment 23 having a thickness of about several um. The plating layer 24 is mainly composed of molten zinc, contains a large amount of impurities such as aluminum, magnesium, and silicon, and is more likely to cause plating cracks as the thickness of the plating layer becomes thicker. The cover base material 25 is a rolled iron-based material.

Fig. 4 is a sectional view of a main part of the cover 22 of the electronic control device 1 according to embodiment 1 of the present invention, and is a view for explaining the plating cracks 24 a. The cover 22 shown in fig. 3 is formed with a plating crack 24a by molding or the like, and is provided with an exposed portion 25a of the base material. The exposed portion is impregnated with the sealing material 28.

Fig. 5 is a sectional view of a main part of a cover 22 of an electronic control device 1 according to embodiment 1 of the present invention, and is a view for explaining the effects of the present invention. The exposed portion 25a of the base material formed by molding or the like is wetted with the sealing material 28, and the plating corrosion 24b is stopped at the portion wetted with the sealing material 28, thereby preventing leakage. In general, it is known that zinc of the plating layer 24 corrodes more easily than iron, so zinc corrodes preferentially, thereby having an effect of preventing corrosion of iron.

Fig. 6 is a front view of a main part of a cover 22 of the electronic control device 1 according to embodiment 1 of the present invention.

In order to forcibly generate the plating crack 24a, a drawn portion 33a is provided in the vicinity of the contact portion 22a between the inside of the cover and the case base.

Fig. 7 is a sectional view of an essential part of a cover 22 of the electronic control device 1 of embodiment 1 of the present invention. As shown in fig. 6, a processed portion 33 is provided in the vicinity of the contact portion 22a between the inside of the cover and the case base, and a plating crack 24a exposing the base material is generated. In order to generate the plating cracks 24a, a drawn portion 33a is provided in the vicinity of the contact portion 22a between the inside of the cover and the housing base, and plating cracks 33b are generated at the portion of the drawn portion. The plating cracks 24a expose the base material, and the wetting sealant 28 wets, thereby delaying the plating corrosion 24 b. Further, by providing the plating cracks 24a in the vicinity of the contact portion 22a between the inside of the cover and the case base, the plating corrosion 24b starting from the cover through hole 22b can be delayed.

According to the present embodiment, the corrosion resistance of the cover of the electronic control device 1, which is increased in size with the increase in functionality, can be improved.

Example 2

Fig. 8 is a front view of a main part of a cover 22 of an electronic control device 1 according to embodiment 2 of the present invention.

In order to forcibly generate the plating crack 24a, a circular groove portion 33c is provided on the periphery of the contact portion 22a between the inside of the cover and the case base.

Fig. 9 is a sectional view of an essential part of a cover 22 of an electronic control device 1 according to embodiment 2 of the present invention. As shown in fig. 8, a processed portion 33 is provided in the vicinity of a contact portion 22c between the inside of the cover and the case base, and a plating crack 24a exposing the base material is generated. In order to generate the plating cracks 24a, a circular groove portion 33c is provided in the vicinity of the contact portion 22a between the inside of the cover and the case base, and a plating crack 33d is generated at the portion of the circular groove portion. The plating cracks 24a expose the base material, and the wetting sealant 28 wets, thereby delaying the plating corrosion 24 b.

According to the present embodiment, the corrosion resistance of the cover of the electronic control device 1, which is increased in size with the increase in functionality, can be improved.

Example 3

Fig. 10 is a front view of a main part of a cover 22 of an electronic control device 1 according to embodiment 3 of the present invention.

In order to forcibly generate the plating crack 24a, a triangular groove portion 33e is provided in the periphery of the contact portion 22a between the inside of the cover and the base of the case.

Fig. 11 is a sectional view of an essential part of a cover 22 of an electronic control device 1 according to embodiment 2 of the present invention. As shown in fig. 8, a processed portion 33 is provided in the vicinity of a contact portion 22c between the inside of the cover and the case base, and a plating crack 24a exposing the base material is generated. In order to generate the plating cracks 24a, a triangular groove portion 33c is provided in the vicinity of the contact portion 22a between the inside of the cover and the case base, and a plating crack 33f is generated at the position of the triangular groove portion. The plating cracks 24a expose the base material, and the wetting sealant 28 wets, thereby delaying corrosion 24b of the plating layer.

According to the present embodiment, the corrosion resistance of the cover of the electronic control device 1, which is increased in size with the increase in functionality, can be improved.

Example 4

Fig. 12 is a front view of a main part of a cover 22 of an electronic control device 1 according to embodiment 4 of the present invention. In order to forcibly generate the plating cracks 24a, a string-like uneven portion 33g is provided on the cover inner side 22c on the sealed space side of the cover through hole.

Fig. 13 is a sectional view of an essential part of a cover of an electronic control apparatus according to embodiment 4 of the present invention.

A string-shaped concave-convex processed part 33g is provided on the cover inner side 22c closer to the sealed space than the cover through hole, and a plating crack 24a exposing the base material is generated. A coating crack 33h was generated at the position of the string-like uneven worked portion. The plating cracks 24a expose the base material, and the wetting sealant 28 wets, thereby delaying the plating corrosion 24 b. Since the string-like uneven portion processed portion 33g can process a flat portion of the cover, the string-like uneven portion processed portion 33g can be freely moved. The string-like uneven worked portion 33g is provided on the cover inner side 22c on the sealed space side with respect to the cover through hole, and is effective for the plating corrosion 24b that enters the cover inner side 22c on the sealed space side from the cover through hole. Further, since the plating corrosion 24b can be delayed at a plurality of locations by providing the processed portion 33 in the vicinity of the contact portion 22c between the inside of the cover and the housing base and the cover inside 22c on the sealed space side of the cover through hole, it is most preferable to provide the processed portion at a plurality of locations for the plating corrosion 24 b.

According to the present embodiment, the corrosion resistance of the cover of the electronic control device 1, which is increased in size with the increase in functionality, can be improved.

Example 5

Fig. 14 is a front view of a main part of a cover 22 of an electronic control device 1 according to embodiment 5 of the present invention. The exposed portion 25a of the base material due to the plated crack 24a by the working is impregnated with the sealing material 28, and the corrosion resistance is improved, but the same effect can be obtained by treating the cover surface in addition to the exposure of the base material by the working.

As shown in fig. 14, the plating layer 24 is removed by scribing 34a with a line having a width of several mm on the plating layer surface of the cover inner side 22c of the cover 22 on the sealed space side of the cover through hole, thereby exposing the base material, and the sealing material 28 is impregnated into the exposed portion of the base material, thereby delaying the plating corrosion 24 b.

Example 6

Fig. 15 is a front view of a main part of a cover 22 of an electronic control device 1 according to embodiment 6 of the present invention. As shown in fig. 15, the plating layer 24 is removed by sand treatment 34b on the plating layer surface of the cover inner side 22c provided on the cover 22 on the sealed space side from the cover through hole, thereby exposing the base material, and the sealing material 28 is impregnated into the exposed portion of the base material, thereby delaying the plating corrosion 24 b.

Description of the symbols

1 … electronic control device

10 … printed wiring board

20 … casing

20a … degassing discharge part

20b … opening part

20c … opening edge part

20d … casing through hole

21 … wide mouth

22 … cover

22a … contact part of inner side of cover and base of casing

22b … cover through hole

22c … is located on the cover inner side of the sealed space side with respect to the cover through hole

22d … peripheral edge

23 … chemical conversion treatment

24 … coating

24a … coating crack

24b … corrosion of plating

25 … cover base material

25a … exposed part of parent material

26 … heat sink

27 … sealing material

28 … sealing material

29 … Heat dissipating adhesive

30 … screw

30a … spring washer

30b … flat gasket

31 … screw

32 … connector

32a … No. 1 connector

32b … No. 2 connector

32c … No. 3 connector

32d … casing groove

33 … processing part

33a … deep drawing part

Crack of plating layer at 33b … deep drawing part

33c … circular groove part

Coating cracks at the location of the 33d … circular groove

33e … Square groove

Crack in plating layer at the position of 33f … square groove

33g … rope-shaped concave-convex processing part

Coating cracks at the positions of 33h … rope-shaped concave-convex processing parts

34 … plated surface treatment

34a … scribing process

34b … sand treatment.