JP5716647B2 - Electronic equipment - Google Patents

Description

The present invention is provided with a waterproof casing in which a case and a cover are screw-fastened and the inner space is made a waterproof space by a sealing material, and a part of a connector and a circuit board are placed in the inner space of the waterproof casing. Relates to contained electronic devices

  Conventionally, a case and cover are screw-fastened, and a waterproof housing is provided in which the internal space is made waterproof by a sealing material. Part of the connector and circuit board are housed in the internal space of the waterproof housing For example, an electronic device described in Patent Document 1 is known.

  As described in Patent Document 1, the sealing material (moisture-curing adhesive) is disposed in contact with the entire periphery of the peripheral portion of the case (base) and the peripheral portion of the cover. Moreover, in each peripheral part, the hole (for example, internal thread part) to which a screw is fastened is formed outside the annular seal region where the sealing material is placed in contact.

JP 2010-258360 A

  By the way, in the said structure, the application quantity of a sealing material is an important parameter with respect to waterproof performance, and if the application quantity is small, waterproofness cannot be ensured. On the other hand, if the application amount is large, the sealing material may protrude from the sealing region and the sealing material may enter the hole. When the sealing material is inserted into the hole, a desired axial force (clamping force) cannot be obtained due to the resistance of the sealing material even if the sealing material is fastened with a predetermined tightening torque. In such a state where the axial force is insufficient, the sealing material is not sufficiently crushed by the case and the cover, and the adhesive strength of the sealing material to the waterproof housing is reduced, so that it is conceivable that waterproofness cannot be ensured.

  For this reason, in order to ensure waterproofness and not to let out a sealing material, the application amount must be strictly controlled. However, since the allowable range of the appropriate coating amount is narrow and the coating amount from the coating machine also varies, adjustment takes a very long time. Although the above problem can be solved by separating the seal region and the hole, the size of the waterproof housing is increased, and the demand for miniaturization cannot be met.

In view of the above problems, an object of the present invention is to provide an electronic device that can ensure waterproofness without increasing the physique.

In order to achieve the above object, an electronic device according to claim 1 is provided.
A case and a cover, a curable sealing material that is disposed in contact with each other on the entire periphery of the case and a peripheral surface of the case, and a screw that fastens the case and the cover. The peripheral edge portion of the cover and the peripheral edge portion of the cover have a plurality of sets of screw fastening holes formed at positions facing each other outside the seal region where the sealing material is disposed. A waterproof housing in which the internal space configured in a fastened state is made waterproof by a sealing material ,
A circuit board;
A connector mounted on a circuit board,
In a state where the case and the cover are assembled by screw fastening, a part of the connector is exposed to the outside, and the remaining part of the connector and the circuit board are accommodated in the internal space of the waterproof housing,
The sealing material is disposed in contact with the peripheral edges of the case and the cover over the entire periphery, between the facing portions of the peripheral edge of the case and the peripheral edge of the cover, and between the peripheral edge of the housing and the connector. It is interposed between the opposing parts.

  And in at least one of the peripheral portion of the case and the peripheral portion of the cover, a storage groove for storing the sealing material protruding from the seal region is formed between at least one of the hole portions and the seal region. Features.

  In the present invention, even if the sealing material protrudes from the seal region, it can be stored in a storage groove provided between the hole and the seal region. Thereby, it can suppress that the sealing material which protruded from the seal | sticker area | region enters a hole part. Therefore, the sealing material is not sufficiently crushed by the case and the cover due to insufficient axial force, and the problem that the adhesive force of the sealing material to the waterproof casing is reduced can be made difficult to occur. Moreover, the distance which a sealing material reaches | attains from a seal | sticker area | region to a hole part can be earned by the depth of a storage groove. Thus, according to the present invention, waterproofness can be ensured without increasing the size of the waterproof casing.

  Moreover, since the protruding sealing material can be stored in the storage groove, the allowable range of the coating amount can be widened compared to the conventional case. Thereby, workability | operativity of sealing material application | coating can be improved (adjustment time is shortened).

As claimed in claim 2,
The storage groove is preferably formed at a position that does not overlap the seat surface of the screw.

  If the storage groove is directly below the seating surface, the screw tends to loosen. On the other hand, according to the present invention, loosening of the screw can be suppressed.

  According to a third aspect of the present invention, the storage groove is preferably formed so that the longitudinal direction thereof follows the outer contour of the seating surface. In addition, as described in claim 4, the storage groove may be formed along the seal region in the longitudinal direction.

  According to these, the size of the waterproof housing can be further reduced.

As claimed in claim 5,
Storage grooves may be formed on the peripheral edge of the case and the peripheral edge of the cover, respectively.

  According to this, more sealing material can be stored compared with the structure in which the storage groove is formed only in one of the case and the cover. Thus, the storage effect can be enhanced and the penetration of the sealing material into the hole can be effectively suppressed.

As claimed in claim 6,
It is good also as a structure which a storage groove opens to the outer peripheral end surface of a peripheral part.

  According to this, even if the amount of the sealing material that protrudes from the sealing region is large, it can escape to the outside of the waterproof housing through the storage groove. Thereby, the penetration | invasion to the sealing material in a hole can be suppressed effectively.

As claimed in claim 7 ,
In a state where the screw is fastened, a part of the connector is exposed to the outside through the connector opening constituted by the case and the cover,
The seal member is interposed between the facing part of the peripheral part of the case and the connector and between the peripheral part of the cover and the facing part of the connector, respectively.
Among the plurality of hole portions, a sealing material interposed between the facing portions of the peripheral portion of the case and the connector, a sealing material interposed between the facing portions of the peripheral portion of the cover and the connector, and the peripheral portion of the case and the cover It is preferable that a storage groove is formed with respect to a hole portion close to the three-forked joint portion where the sealing material interposed between the opposing portions of the peripheral portion of the first and second peripheral portions is joined.

  Since the trifurcated junction is a junction of the sealing material, the sealing material tends to protrude from the seal region. On the other hand, in this invention, since a storage groove is provided with respect to the hole part close | similar to a trident junction part among several hole parts, even if a sealing material protrudes, waterproofness can be ensured.

It is the top view seen from the cover side which shows schematic structure of the housing | casing for waterproofing and electronic control apparatus which concern on 1st Embodiment. It is the perspective view which decomposed | disassembled the case and the cover in the electronic control unit. It is the perspective view which decomposed | disassembled the circuit board and case where the connector was mounted in the electronic control unit. It is the perspective view which decomposed | disassembled the connector, the circuit board, and the case in an electronic control unit. It is a top view of a case It is sectional drawing which follows the VI-VI line of FIG. It is sectional drawing which shows the modification of a storage groove part, and respond | corresponds to FIG. It is sectional drawing which shows the modification of a storage groove part, and respond | corresponds to FIG. It is a top view which shows the modification of a storage groove part, and respond | corresponds to FIG. It is a top view which shows the modification of a storage groove part, and respond | corresponds to FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings shown below, common or related elements are given the same reference numerals.

  In the present embodiment, an example of an electronic control device having a waterproof structure used as an engine ECU (Electric Control Unit) of a vehicle is shown as the electronic device. In the present embodiment, the thickness direction of the circuit board is simply referred to as the thickness direction, and the direction perpendicular to the thickness direction is simply referred to as the vertical direction.

  As shown in FIGS. 1 to 4, the electronic control device 10 includes a circuit board 11 on which an electronic component 21 is mounted on an insulating base material 20, a connector 12 mounted on the circuit board 11, and one connector 12. A housing 13 for housing the circuit board 11, a sealing material 14 for hermetically sealing the internal space of the housing 13, and a screw for assembling the case 40 and the cover 41 to form the housing 13. 15. Note that a case 40 and a cover 41, a sealing material 14, and a screw 15 described later constituting the housing 13 correspond to the waterproof housing described in the claims. That is, the screw 15 corresponds to the screw described in the claims.

  First, schematic configurations of the housing 13 and the electronic control device 10 will be described with reference to FIGS.

  As shown in FIGS. 2 to 4, the circuit board 11 is made of an electrically insulating material such as a resin, and includes an insulating base material 20 on which wiring including lands is formed, a microcomputer mounted on the insulating base material 20, And an electronic component 21 such as a power transistor, a resistor, and a capacitor. The wiring and the electronic component 21 constitute a circuit. In the present embodiment, the electronic component 21 includes a heating element such as a power MOSFET that generates a particularly large amount of heat. The electronic component 21 is mounted on both the one surface 11a of the circuit board 11 and the back surface 11b opposite to the one surface 11a, and the heating element is mounted on the back surface 11b (not shown). The circuit board 11 has a through hole 22 formed corresponding to the terminal 31 of the connector 12, and a land (not shown) is formed on the wall surface of the through hole 22.

  Moreover, in this embodiment, as shown in FIG. 4, the circuit board 11 (insulating base material 20) has a substantially convex outline in a plane along the vertical direction, and the protruding portion is the connector 12 among them. This is the arrangement area. In addition, through holes 23 for fixing the circuit board 11 to the case 40 are formed at the four corners of the substantially rectangular portion excluding the region where the connector 12 is disposed in the insulating base 20. In addition, a through hole 24 into which a protrusion 35 (described later) of the connector 12 is inserted is formed in the protruding portion where the connector 12 is disposed.

  On such a circuit board 11, a connector 12 that electrically relays a circuit configured on the circuit board 11 and an external device is mounted. The connector 12 is mainly disposed on the one surface 11 a of the circuit board 11.

  As shown in FIGS. 2 to 4, the connector 12 includes a housing 30 made of an electrically insulating material, and a plurality of terminals 31 that are held in the housing 30 and substantially relay a circuit and an external device electrically. ,have. The plurality of terminals 31 are arranged in multiple stages in the thickness direction with respect to the housing 30 and are arranged along one direction parallel to the vertical direction. One end of the terminal 31 protrudes from the housing 30 and is electrically connected to a corresponding land of the circuit board 11. The other end of the terminal 31 is exposed to the outside from the connector opening 44 of the housing 13 in the housing 30. It is exposed in the port part 32 which is a part to be exposed. In the present embodiment, the terminal 31 is inserted into the through hole 22 of the circuit board 11 and soldered to a land formed on the wall surface of the through hole 22. However, the mounting structure of the terminal 31 is not limited to such an insertion mounting structure, and a surface mounting structure can also be adopted.

  The housing 30 has a protruding strip (not shown) at a portion facing the case 40 and a groove 33 at a portion facing the cover 41 as a sealing region where the sealing material 14 is placed in contact. Then, the ridge portion and the groove portion 33 are connected to each other, and are provided in an annular shape along a portion of the housing 30 facing the housing 13, that is, the connector opening 44. Also, reference numeral 34 shown in FIG. 4 is a tie bar (alignment plate) for aligning the plurality of terminals 31.

  Furthermore, as shown in FIGS. 3 and 4, the housing 30 has a protrusion 35 extending along the thickness direction at a portion facing the one surface 11 a of the circuit board 11. The protrusion 35 is for positioning the connector 12, the circuit board 11, and the case 40 together. In the present embodiment, the contour shape of the cross section along the vertical direction of the protrusion 35 is a perfect circle. The protrusions 35 are provided at both ends of the connector 12 in the longitudinal direction, more specifically, at portions outside the holding region of the terminals 31 in the housing 30 in the longitudinal direction. That is, the two protruding portions 35 are provided so as to sandwich the plurality of terminals 31.

  The housing 13 is made of a metal material such as aluminum or iron, or a resin material, and accommodates a part of the connector 12 or the circuit board 11 therein to protect them. As shown in FIG. 2, the housing 13 includes two members divided in the thickness direction. Specifically, it consists of two members, a box-like case 40 having a shallow bottom with one surface (top surface) opened, and a cover 41 that closes the opening of the case 40. The case 40 is a member to which the circuit board 11 is fixed (assembled). The case 40 and the cover 41 are assembled by the screw 15, and a housing 13 that accommodates a part of the connector 12 and the circuit board 11 is configured. In this embodiment, the case 40 is formed by a die casting method using an aluminum-based material, and the cover 41 is formed by a pressing method using an iron-based material.

  The peripheral portions 42 and 43 of the case 40 and the cover 41 are partially opposed to each other, and the remaining portions are opposed to the housing 30 of the connector 12. As described above, a connector opening 44 for exposing a part of the connector 12 to the outside is formed in a portion of the peripheral portions 42 and 43 of the case 40 and the cover 41 facing the housing 30 of the connector 12. Yes.

  As shown in FIG. 5, a groove 45 as a sealing region in which the sealing material 14 is disposed in contact is formed in an annular shape around the entire circumference of the peripheral portion 42 of the case 40 so as to surround the inner space. A part of the groove 45 is opposed to the ridge portion of the housing 30, and the remaining portion is opposed to the ridge portion 56 of the cover 41. As shown in FIGS. 2 to 5, a screw hole 46 (in which a screw 15 (male screw) is inserted when the cover 41 is assembled to the case 40 is formed in a portion (outer peripheral portion) outside the groove portion 45 in the peripheral portion 42. A female thread) and a projection 47 serving as a position reference when the cover 41 is assembled to the case 40 are formed. The screw hole 46 corresponds to the hole described in the claims. As shown in FIG. 5, the screw holes 46 are formed in the vicinity of the four corners of the case 40 in the case 40 in which the planar shape perpendicular to the thickness direction forms a substantially rectangular shape. That is, four screw holes 46 are formed in the peripheral portion 42 of the case 40. Two of the screw holes 46 are located in the vicinity of a trifurcated junction 59 described later. Further, the peripheral portion 42 has a flange portion 48 that does not face the cover 41, and a hole portion 49 for attaching the electronic control device 10 to the vehicle is provided in the flange portion 48.

  As shown in FIG. 5, a mounting portion 50 that protrudes from the inner surface to place the circuit board 11 on the inner side (inner peripheral portion) of the case 40 than the groove portion 45 is just inside the groove portion 45. Are provided at four locations while being separated from each other. The mounting portion 50 has a flat surface facing the circuit board 11 so that the circuit board 11 can be supported by the surface. Each mounting portion 50 is provided with a hole 51 for fixing the circuit board 11 to the case 40. A screw 52 is inserted into the hole 51 through the through hole 23 of the circuit board 11, and the circuit board 11 is It is fixed to the case 40. In addition, a pedestal 53 that protrudes from the inner surface is provided at a portion facing the electronic component 21 (heat generating element) mounted on the back surface 11b of the circuit board 11, and through a heat dissipation member (not shown) such as a gel, Heat can be dissipated from the electronic component 21 to the pedestal 53 (case 40). Moreover, the base part 54 which protrudes from an inner surface is provided also in the other site | part of an inner surface so that heat can be radiated from the circuit board 11 to the base part 54 (case 40) via heat dissipation members (not shown) such as gel. It has become. In the present embodiment, the pedestal 54 is provided at a position overlapping the electronic component 21 mounted on the one surface 11 a of the circuit board 11, and the heat of the electronic component 21 constitutes the circuit board 11. It is transmitted to the pedestal portion 54 through the insulating base material 20 to be performed.

  In addition, the case 40 has a hole 55 in the mounting portion 50 into which the protruding portion 35 of the housing 30 is inserted. Then, the protrusion 35 is inserted into the hole 55 of the case 40 through the through hole 24 of the circuit board 11, thereby determining the relative positions of the circuit board 11, the connector 12, and the case 40 in the vertical direction. ing. Two through holes 24 and two hole portions 55 are also provided corresponding to the protrusions 35. The opening shape of one through hole 24 and hole 55 is a perfect circle, and the opening shape of the other through hole 24 and hole 55 is an oval that is long in the longitudinal direction of the connector 12. This is because the oval through hole 24 and the hole 55 absorb the positional deviation within the allowable tolerance with reference to the perfect circular through hole 24 and the hole 55. However, both the through holes 24 and the hole portions 55 may have the same shape (for example, a perfect circle shape).

  On the other hand, on the peripheral edge portion 43 of the cover 41, a ridge portion 56 shown in FIG. 6 as a sealing region in which the sealing material 14 is disposed in contact is formed in an annular shape over the entire circumference so as to surround the internal space. A part of the ridge 56 faces the groove 33 of the housing 30, and the remaining part faces the groove 45 of the case 40. Further, as shown in FIG. 2, a through hole 57 into which the screw 15 is inserted when the cover 41 is assembled to the case 40, and the case 40, in the outer peripheral portion of the peripheral edge portion 43 of the cover 41, as shown in FIG. A through hole 58 for positioning into which the protrusion 47 is inserted is formed. The through hole 57 corresponds to the hole portion described in the claims together with the screw hole 46 described above. The through holes 57 are respectively formed at positions corresponding to the screw holes 46 in the peripheral edge 43 of the cover 41. That is, four screw holes 46 are formed in the peripheral edge portion 43 of the cover 41.

  The sealing material 14 is a curable sealing material that hardens after disposing a liquid material. The internal space of the housing 13 is hermetically sealed against, for example, an engine room, and water enters the internal space. It fulfills the function of preventing In the present embodiment, a silicon-based moisture curable adhesive is used as the sealing material 14. The sealing material 14 is disposed between the portions of the peripheral edge portion 42 of the case 40 and the peripheral edge portion 43 of the cover 41 that face each other. Further, the connector 12 is also disposed between the facing portions of the housing 30 and the case 40 and between the facing portions of the housing 30 and the cover 41. And the sealing material 14 arrange | positioned between each opposing site | part merges in the longitudinal direction both ends of the housing 30, and comprises the trident junction part 59. FIG.

  Next, a procedure for assembling the electronic control device 10 will be described.

  First, the case 40 is prepared, and the liquid sealing material 14 is applied in the groove 45 of the case 40. Next, the circuit board 11 on which the connector 12 is mounted is positioned and placed on the case 40. At this time, the projecting portion 35 of the housing 30 is inserted into the hole portion 55 of the case 40 through the through hole 24 of the circuit board 11 to determine the position. At this point, the ridge formed on the housing 30 comes into contact with the sealing material 14 in the groove 45. Next, the liquid sealing material 14 is applied to the groove 33 of the housing 30 constituting the connector 12. Then, the cover 41 is positioned and placed on the case 40 so that the peripheral portions 42 and 43 face each other. At this time, the protrusion 47 of the case 40 is inserted into the through hole 58 of the cover 41, and the position is determined. At this time, the convex strip 56 of the cover 41 contacts the sealing material 14 disposed in the groove 33 and the sealing material 14 disposed in the groove 45. Then, the screw 15 is screwed into the screw hole 46 of the case 40 through the through hole 57 of the cover 41. That is, the case 13 is formed by fastening the case 40 and the cover 41 with the screw 15. Next, the electronic control device 10 can be obtained by curing the sealing material 14.

  Next, the structure of the characteristic part of the housing | casing 13 and the electronic control apparatus 10 which concern on this embodiment, and an effect are demonstrated.

  In the present embodiment, as shown in FIGS. 5 and 6, the storage groove portion 60 between the groove portion 45 and the screw hole 46 in the peripheral portion 42 of the case 40 among the case 40 and the cover 41 constituting the housing 13. Is formed. The storage groove portion 60 protrudes in order to prevent the liquid sealing material 14 protruding from, for example, the groove portion 45 as a sealing region from flowing into the screw hole 46 and the through hole 57 as the hole portion to which the screw 15 is fastened. The function of storing the sealing material 14 is fulfilled. The storage groove 60 corresponds to the storage groove described in the claims. The storage groove portion 60 is integrally formed when the case 40 is formed by a die casting method.

  More specifically, storage groove portions 60 are respectively provided for the four screw holes 46, and each storage groove portion 60 is provided so as to block the corresponding screw hole 46 from the annular groove portion 45. Moreover, each storage groove part 60 is formed in the position which does not overlap with the seat surface 15a of the screw | thread 15, as shown in FIG. Furthermore, as shown in FIG. 5, the longitudinal direction of the storage groove 60 is formed along the outer contour of the seating surface 15 a of the screw 15. That is, the storage groove 60 is formed in an arc shape. The storage groove 60 has a narrower width and a shallower depth than the groove 45. 2 to 4, the storage groove 60 is omitted for convenience.

  Thus, in this embodiment, the storage groove part 60 is provided in the peripheral part 42 of the case 40. Therefore, even if the liquid sealing material 14 protrudes from, for example, the groove 45 as the seal region, it can be stored in the storage groove 60 provided between the screw hole 46 and the groove 45. Thereby, it is possible to prevent the protruding sealing material 14 from entering the screw hole 46 or the through hole 57. Therefore, even if the sealing material 14 becomes a resistance and the screw 15 is fastened with a predetermined tightening torque, a desired axial force (fastening force) cannot be obtained, and the sealing material for the case 40 and the cover 41 due to insufficient axial force. It is possible to suppress the occurrence of the problem that the adhesive strength of the sheet is reduced and waterproofness cannot be ensured. The storage groove 60 is formed to extend in the thickness direction. Therefore, as compared with a configuration in which the distance between the groove 45 and the screw hole 46 is simply separated in the vertical direction, the distance that the sealing material 14 reaches the screw hole 46 from the groove 45 is obtained by the depth of the storage groove 60. Can do. As described above, according to the present embodiment, waterproofness can be ensured without increasing the size of the housing 13.

  Further, since the protruding sealing material 14 can be stored in the storage groove 60, the allowable range of the coating amount can be widened compared to the conventional case. Thereby, the workability | operativity of application | coating of the sealing material 14 can also be improved (adjustment time can be shortened).

  By the way, if the storage groove portion 60 is directly below the seat surface 15a, the screw 15 is likely to be loosened. On the other hand, in this embodiment, the storage groove part 60 is formed in the position which does not overlap with the seat surface 15a of the screw 15. FIG. Therefore, loosening of the screw 15 can be suppressed.

  Moreover, in this embodiment, the longitudinal direction of the storage groove part 60 is formed along the external shape outline of the seat surface 15a. For this reason, the physique of case 40 and by extension, housing 13 can also be made smaller.

  Further, since the trifurcated joining portion 59 is a joining portion of the sealing material 14 as described above, the sealing material 14 easily protrudes from, for example, the groove portion 45 as a sealing region. On the other hand, in this embodiment, the storage groove part 60 is formed with respect to all the screw holes 46. That is, the storage groove 60 is formed in the screw hole 46 close to the trifurcated junction 59. Therefore, waterproofness can be ensured.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In this embodiment, the case where the housing | casing 13 is applied to the electronic control apparatus 10 was shown. However, the present invention can be applied to devices other than the electronic control device 10. The member accommodated in the internal space of the housing 13 is not limited to the circuit board 11 on which the connector 12 is mounted. Further, a part of the member accommodated in the internal space is not limited to the configuration exposed to the outside of the housing 13. For example, the housing 13 may have a configuration in which the peripheral edge portion 42 of the case 40 and the peripheral edge portion 43 of the cover 41 face each other around the entire periphery. That is, it is good also as a structure which does not have the opening part 44 for connectors. Further, even if the circuit board 11 on which the connector 12 is mounted is accommodated, for example, a connector opening is provided on the bottom surface of the box-shaped cover 41, and the housing 30 is formed at the peripheral edge of the connector opening. It is good also as a structure which interposes the sealing material 14 in between and the peripheral parts 42 and 43 oppose on the perimeter.

  The storage groove 60 includes at least one of a screw hole 46 and a through hole 57 as a hole, a groove 45 as a seal region, and a protrusion on at least one of the peripheral edge 42 of the case 40 and the peripheral edge 43 of the cover 41. What is necessary is just to form between the strips 56. FIG. In this embodiment, the example which provides the storage groove part 60 in case 40 was shown. However, as shown in FIG. 7, the storage groove 61 may be provided not only in the case 40 but also in the cover 41. The storage groove 61 is formed in the peripheral portion 43 of the cover 41 between the protruding strip portion 56 as a seal region and the through hole 57 as a hole portion. In FIG. 7, the storage groove portion 60 of the case 40 and the storage groove portion 61 of the cover 41 face each other to form one storage space. As described above, when the storage groove portions 60 and 61 are provided in the case 40 and the cover 41, respectively, a larger amount of the sealing material 14 can be provided compared to the configuration in which the storage groove portions 60 and 61 are formed only in one of the case 40 and the cover 41. Can be stored. Thus, the storage effect can be enhanced and the penetration of the sealing material 14 into the screw hole 46 and the through hole 57 can be effectively suppressed. Furthermore, it is good also as a structure which provided the storage groove part 61 in the cover 41, without providing the storage groove part 60 in the case 40. FIG.

  In this embodiment, the example in which the storage groove part 60 is formed with respect to all the screw holes 46 was shown. However, as described above, the sealing material 14 tends to protrude in the vicinity of the trifurcated junction 59. Therefore, it is preferable to provide the storage groove portion 60 with respect to the screw hole 46 close to at least the trident junction portion 59.

  In this embodiment, the example in which the storage groove part 60 is formed in the position which does not overlap with the seat surface 15a of the screw 15 was shown. However, as shown in FIG. 8, the storage groove 60 may be formed so as to overlap a part of the seating surface 15 a of the screw 15.

  In this embodiment, the example in which the storage groove part 60 was formed so that a longitudinal direction followed the outer diameter outline of the seat surface 15a was shown. However, the shape of the storage groove 60 is not limited to the above example. For example, as shown in FIG. 9, a storage groove 60 may be provided so that the longitudinal direction is along the groove 45 serving as a seal region. Even with such a configuration, the physique of the case 40 and thus the housing 13 can be further reduced in size.

  Furthermore, as illustrated in FIG. 10, the storage groove 60 may be configured to open to the outer peripheral end surface of the peripheral edge 42 of the case 40. According to this, for example, even if the amount of the sealing material 14 protruding from the groove 45 is large, it can escape to the outside of the housing 13 through the storage groove 60. Thereby, the penetration | invasion to the sealing material 14 in the screw hole 46 and the through-hole 57 can be suppressed effectively.

  As the storage groove portions 60 and 61, for example, a linear shape can also be adopted. Moreover, it is good also as an annular | circular shape so that the groove part 45 may be surrounded. Furthermore, for example, multiple storage groove portions 60 may be provided between the groove portion 45 and the screw hole 46.

  In the present embodiment, the connector 12, the circuit board 11, and the case 40 (housing 13) are collectively positioned by the protrusion 35 provided on the connector 12, the through hole 24 of the circuit board 11, and the hole 55 of the case 40. An example to do. However, the positioning of the connector 12, the circuit board 11, and the case 40 is not limited to the above example. For example, the position of the connector 12 with respect to the case 40 may be determined by inserting the positioning pins of the case 40 into the positioning holes of the circuit board 11 with the connector 12 mounted on the circuit board 11. Moreover, it is good also as a structure which provides the positioning hole in the connector 12 and inserts the positioning pin of case 40 in this positioning hole.

10 ... Electronic control device (electronic device)
11 ... Circuit board (circuit board)
12 ... Connector (connector)
13 ... Case (waterproof casing)
14 ... Sealing material 15 ... Screw (screw)
15a ... Seating surface 40 ... Case 41 ... Covers 42, 43 ... Peripheral part 45 ... Groove (seal area)
46 ... Screw hole (hole)
56 ... ridge (seal area)
57 ... through hole (hole)
59 ... Trident junction 60 ... Reservation groove (reservation groove)
61... Storage groove (storage groove)

Claims (7)

A case and a cover; a curable sealing material arranged in contact with each other over the entire periphery of the peripheral portion of the case and the peripheral portion of the cover; and a screw for fastening the case and the cover; The peripheral portion of the case and the peripheral portion of the cover have a plurality of sets of screw fastening holes formed at positions facing each other outside a sealing region where the sealing material is disposed, A waterproof housing in which an internal space configured in a state where the case and the cover are fastened by a screw is a waterproof space by the sealing material ;
A circuit board;
A connector mounted on the circuit board,
In a state where the case and the cover are assembled by screw fastening, a part of the connector is exposed to the outside, and the remaining part of the connector and the circuit board are accommodated in the internal space of the waterproof housing,
The sealing material is arranged in contact with the peripheral edges of the case and the cover over the entire circumference, between the opposing portions of the peripheral edge of the case and the peripheral edge of the cover, and of the casing. Intervening between the opposing part of the peripheral part and the connector,
In at least one of the peripheral portion of the case and the peripheral portion of the cover, a storage groove for storing the sealing material protruding from the seal region is formed between at least one of the hole portions and the seal region. An electronic device characterized by comprising: The electronic device according to claim 1, wherein the storage groove is formed at a position that does not overlap the seating surface of the screw. The electronic device according to claim 1, wherein the storage groove has a longitudinal direction formed along an outer contour of a seating surface of the screw. The electronic device according to claim 1, wherein the storage groove has a longitudinal direction formed along the seal region. 5. The electronic device according to claim 1, wherein the storage grooves are formed in a peripheral edge portion of the case and a peripheral edge portion of the cover, respectively. The electronic device according to claim 1, wherein the storage groove is opened on an outer peripheral end surface of the peripheral edge. In a state where the screw is fastened, a part of the connector is exposed to the outside through a connector opening constituted by the case and the cover,
The sealing member is interposed between the peripheral portion of the case and the facing portion of the connector, and between the peripheral portion of the cover and the facing portion of the connector, respectively.
Among the plurality of hole portions, a sealing material interposed between the peripheral portion of the case and the facing portion of the connector, a sealing material interposed between the peripheral portion of the cover and the facing portion of the connector, and the above claims are sealing material interposed between opposing portions of the peripheral portion and the peripheral portion of the cover of the case with respect to the hole closer to the trigeminal merging unit for merging, wherein the storage groove is formed The electronic device according to any one of 1 to 6 .

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