JP2012209508A - Electronic circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a connector and a cover comprising an electronic circuit device to be fixed to a case with an adhesive while maintaining a high accuracy in assembling the electronic circuit device.SOLUTION: An electronic circuit device 20 has a connector insertion part 33 in which a connector 22 is inserted from above into a sidewall 32 of a case 30 for storing a circuit board. The connector 22 is fixed to the connector insertion part 33 with an adhesive 50. The case 30, the connector 22, and a cover 40 have adhesive receiving parts 25, 35, and 45 for receiving the adhesive 50 overflowed upward from between the outer peripheries of the connector insertion part 33 and the connector 22.

Description

  The present invention covers a case having a bottom and a side wall formed so as to surround the outer periphery of the bottom, a circuit board accommodated in the case, a connector electrically connected to the circuit board, and a circuit board. And a cover fixed to the side wall of the case from above.

  Conventionally, as an electronic circuit device used as an engine control unit for automobiles, a circuit board on which electronic components are mounted, a connector for electrically connecting the circuit board and the outside, a circuit board is mounted and a connector 2. Description of the Related Art A metal base that is joined and a circuit board, a connector, and a sealing cover that covers part or all of the metal base are known (for example, see Patent Document 1). In this electronic circuit device, the connector is bonded and bonded to the metal base on which the circuit board is mounted via the first and second adhesive layers that also serve as the sealing material, and the cover is bonded to the metal base via the third adhesive layer. The connector and the cover are bonded and bonded via the fourth adhesive layer.

JP 2010-258360 A

  When the circuit board, connector, and cover are sequentially fixed to the metal base via a large number of adhesive layers as in the above-described conventional electronic circuit device, the excess adhesive that is hardened by protruding from the members interferes with the next object to be bonded. As a result, the assembly accuracy may deteriorate.

  Accordingly, the main object of the present invention is to make it possible to fix a connector and a cover constituting the electronic circuit device to the case with an adhesive while maintaining good assembly accuracy of the electronic circuit device.

  The electronic circuit device of the present invention employs the following means in order to achieve the main object described above.

An electronic circuit device according to the present invention comprises:
A case having a bottom and a side wall formed so as to surround the outer periphery of the bottom, a circuit board accommodated in the case, a connector electrically connected to the circuit board, and a circuit board covering the circuit board And an electronic circuit device including a cover fixed to the case from above,
The side wall of the case is formed with a connector insertion portion into which the connector is inserted from above, and the connector is fixed to the connector insertion portion via an adhesive, and the case, the connector, and the At least one of the covers is formed with an adhesive receiving portion that receives the adhesive protruding upward from between the connector insertion portion and the outer periphery of the connector.

  In this electronic circuit device, a connector insertion portion into which a connector is inserted from above is formed on a side wall of a case that accommodates a circuit board, and the connector is fixed to the connector insertion portion via an adhesive. At least one of the case, the connector, and the cover is formed with an adhesive receiving portion that receives the adhesive protruding upward from between the connector insertion portion and the outer periphery of the connector. As a result, even if excess adhesive protrudes when the connector is fixed to the connector insertion portion via the adhesive, the excess adhesive that protrudes is received by the adhesive receiving portion. When fixing to a side wall, it can suppress that the surplus adhesive agent and cover which protruded from between the connector insertion part and the outer periphery of the connector interfered with the cover. Therefore, it is possible to fix the connector and the cover to the case with the adhesive while maintaining the assembly accuracy of the electronic circuit device.

  The adhesive receiving portion may be formed on the side wall of the case so as to be positioned on both sides of the connector inserted into the connector insertion portion. As a result, the adhesive protruding upward from between the connector insertion portion and the outer periphery of the connector can be more reliably received by the adhesive receiving portion.

  Furthermore, the connector may have an adhesive receiving portion formed so as to be adjacent to the adhesive receiving portion on the case side. Thereby, it becomes possible to enlarge the adhesive receiving part which receives the adhesive protruded upward from between the connector insertion part and the outer periphery of the connector.

  In addition, an adhesive receiving portion may be formed on the cover so as to be positioned above both end portions of the connector insertion portion. Thereby, when fixing a cover to the side wall of a case, it becomes possible to suppress more reliably that a cover and the surplus adhesive agent hardened | cured interfere.

  Furthermore, a case-side engaging recess is formed on the side wall of the case so as to be recessed from the upper end surface toward the bottom, and a convex portion that can be engaged with the case-side engaging recess is formed on the inner surface of the cover. The adhesive receiving part may be a recessed part deeper than the case-side engaging recessed part engaged with the projecting part of the cover.

  The connector is formed as a connector-side engagement recess that can be engaged with the projection of the cover, and a recess deeper than the connector-side engagement recess so as to be positioned on both sides of the connector-side engagement recess. And an adhesive receiving part.

  Furthermore, the adhesive receiving part may be formed in the cover by denting at least the convex part located above both ends of the connector insertion part.

It is a perspective view which shows the electronic circuit apparatus 20 which concerns on one Example of this invention. It is sectional drawing along the II-II line in FIG. FIG. 3 is a plan view of the case 30 of the electronic circuit device 20 as viewed from above. It is the reverse view which looked at the cover 40 of the electronic circuit device 20 from the reverse side. 2 is a perspective view showing a main part of an electronic circuit device 20. FIG. FIG. 6 is an explanatory diagram for explaining an assembly procedure of the electronic circuit device 20. FIG. 6 is an explanatory diagram for explaining an assembly procedure of the electronic circuit device 20.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a perspective view showing an electronic circuit device 20 according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. The electronic circuit device 20 of the embodiment shown in these drawings is configured as an electronic control device for controlling a vehicle automatic transmission (not shown), and is fixed to a transmission case of the automatic transmission. The electronic circuit device 20 according to the embodiment includes a circuit board 21 on which a plurality of electronic components are mounted, and an external circuit such as another electronic control unit (not shown) that is electrically connected to the circuit board 21 and is not shown. A connector 22 used for electrical connection with a device, a case 30 to which the circuit board 21 and the connector 22 are fixed, and a cover fixed to the case 30 so as to cover the entire circuit board 21 and a part of the connector 22 40. The circuit board 21 includes electronic parts such as a board made of resin such as glass epoxy, a power supply IC mounted on the board, a solenoid drive circuit that drives a linear solenoid valve of a hydraulic circuit, and a control IC that controls the entire apparatus. Is included.

  The case 30 is made of a metal having high thermal conductivity such as aluminum, for example, and includes a bottom portion 31 and side walls 32 formed so as to rise substantially vertically from the outer periphery of the bottom portion 31 as shown in FIG. The back surface of the circuit board 21 is fixed to the upper surface of the bottom portion 31 using, for example, an adhesive or a bolt having excellent thermal conductivity. Further, as shown in FIGS. 2 and 3, a connector insertion portion 33 into which the connector 22 is inserted from above is formed on the side wall 32. The connector insertion portion 33 is formed by recessing a part of the side wall 32 from the upper end to the bottom portion 31 side according to the outer shape of the connector 22. Further, as shown in FIGS. 2 and 3, the side wall 32 including the connector insertion portion 33 is formed with a case-side engaging recess 34 that is a series of grooves over the entire circumference so as to be recessed from the upper end surface toward the bottom 31. ing.

  The cover 40 is made of a material (resin) having high corrosion resistance such as polybutylene terephthalate (PBT) resin, and is substantially similar to the bottom 31 of the case 30 so that the case 30 can be covered from above. A lid portion 41 having a slightly larger planar shape, and an outer peripheral wall 42 extending downward from the outer periphery of the lid portion 41. In the embodiment, as shown in FIGS. 1 and 4, the outer peripheral wall 42 is not formed in a portion of the case 30 located above the connector insertion portion 33 so as not to interfere with the connector 22. Further, a convex portion 44 that can be engaged with the case side engaging concave portion 34 is formed along the outer peripheral wall 42 on the inner surface of the lid portion 41 of the cover 40.

  Further, as shown in FIG. 2 and FIG. 5, a hook-like engagement convex portion 23 that can be engaged with a case-side engagement concave portion 34 formed in the connector insertion portion 33 at the lower portion and the side portion of the connector 22. Is formed. Further, a connector-side engagement recess (groove) 24 is formed on the upper portion of the connector 22 so as to be adjacent to the case-side engagement recess 34 formed in the side wall 32 of the case 30 when inserted into the connector insertion portion 33. Is formed. When the connector 22 is inserted into the connector insertion portion 33, the bottom surface of the case side engagement recess 34 formed in the side wall 32 of the case 30 and the bottom surface of the connector side engagement recess (groove) 24 of the connector 22 are , Almost the same level.

  In the embodiment, as shown in FIGS. 2 and 5, the adhesive receiving portion 35 is formed on the side wall 32 of the case 30 so as to be positioned on both sides of the connector 22 inserted into the connector insertion portion 33. Yes. The adhesive receiving portion 35 is a recess that is deeper (one step lower) than the case-side engaging recess 34 that engages with the protrusion 44 formed on the inner peripheral surface of the cover 40 on both sides of the connector insertion portion 33. Further, as shown in FIGS. 2 and 5, the connector 22 has an adhesive receiving portion 25 that is a recess deeper than the connector-side engagement recess 24 so as to be positioned on both sides of the connector-side engagement recess 24. Have. The adhesive receiving portion 25 is adjacent to the corresponding adhesive receiving portion 35 on the side of the adhesive receiving portion 35 of the case 30 when the connector 22 is inserted into the connector insertion portion 33 of the case 30. When the connector 22 is inserted into the connector insertion portion 33, the bottom surface of the adhesive receiving portion 25 of the connector 22 and the bottom surface of the adhesive receiving portion 35 of the case 30 are at the same level. Further, as shown in FIG. 4, an adhesive receiving portion 45 is formed on the cover 40 so as to be positioned above both ends of the connector insertion portion 33 of the case 30. The adhesive receiving portion 45 of the cover 40 does not form a convex portion 44 that engages with the case side engaging concave portion 34 at a position facing the both end portions of the connector insertion portion 33 on the inner surface of the lid portion 41, or the convex portion. An adhesive receiving portion 45 is formed by recessing 44.

  Next, an assembly procedure of the electronic circuit device 20 configured as described above will be described with reference to FIGS. 6 and 7. When the electronic circuit device 20 is assembled, the back surface of the circuit board 21 on which electronic components are mounted is bonded and fixed to the upper surface of the bottom of the case 30 using an adhesive or bolts. Next, for example, a thermosetting (addition type) silicone-based adhesive 50 is applied to the case-side engagement recess 34 formed in the connector insertion portion 33 of the case 30 and the engagement projection 23 of the connector 22. The connector 22 is electrically connected to the circuit board 21, and the engaging convex portion 23 of the connector 22 is inserted into the case-side engaging concave portion 34 of the connector insertion portion 33 from above, and the connector 22 is pressed against the case 30. While applying heat, the adhesive 50 is cured.

  Here, when the connector is fixed to the connector insertion portion 33 through the adhesive 50 in this way, as shown in FIG. 6, the connector insertion portion 33 (the case-side engagement recess 34) and the outer periphery of the connector 22 The adhesive sometimes protrudes upward from the gap. On the other hand, in the embodiment, the adhesive receiving portion 35 is formed on the side wall 32 of the case 30 so as to be located on both sides of the connector 22 inserted into the connector insertion portion 33. Adhesive receiving portions 25 are provided so as to be located on both sides of the side engaging recess 24. Therefore, even if the surplus adhesive protrudes when the connector 22 is fixed to the connector insertion portion 33 via the adhesive 50, the surplus adhesive that has protruded becomes the adhesive of the case 30 as shown in FIG. The adhesive 50 that is received by the adhesive receiving portion 25 of the receiving portion 35 and the connector 22 and protrudes from the adhesive receiving portion 35 of the case 30 and the adhesive receiving portion 25 of the connector 22 is cured to form an adhesive cured portion 51. Even so, it is possible to satisfactorily suppress the upper end of the adhesive curing portion 51 from exceeding the bottom surface of the case side engagement recess 34 and the bottom surface of the connector side engagement recess 24 upward.

  If the adhesive 50 is cured after the connector 22 is bonded to the connector insertion portion 33 of the case 30 in this way, the case-side engagement recess 34 formed on the side wall 32 of the case 30 and the connector-side engagement recess 24 of the connector 22 are formed. And applying the adhesive 50 to the convex portion 44 on the inner surface of the cover 40, and then fitting the convex portion 44 of the cover 40 into the case side engaging concave portion 34 of the case 30 and the connector side engaging concave portion 24 of the connector 22, The adhesive 50 is cured by applying heat while pressing the cover 40 against the case 30. At this time, in the embodiment, when the connector 22 is fixed to the case 30, the adhesive 50 protruding from between the connector insertion portion 33 and the outer periphery of the connector 22 is received by the adhesive receiving portion 35 of the case 30 or the adhesive receiving of the connector 22. Since the adhesive receiving portion 45 is formed so as to be received by the portion 25 and further positioned above both ends of the connector insertion portion 33 in the cover 40, the adhesive 50 is formed by curing. Interference between the adhesive curing part 51 and the cover 40 can be satisfactorily suppressed. As a result, it is possible to firmly fix the connector 22 and the cover 40 to the case 30 with the adhesive 50 while maintaining good assembly accuracy of the electronic circuit device 20. Moreover, in the said Example, since interference with the adhesive agent hardening part 51 and the cover 40 can be suppressed favorably, it becomes possible to harden the adhesive agent 50 rapidly by provision of heat, and, thereby, an electronic circuit device. The time required for assembling 20 can be shortened.

  As described above, in the electronic circuit device 20 according to the embodiment, the connector insertion portion 33 into which the connector 22 is inserted from above is formed on the side wall 32 of the case 30 that accommodates the circuit board 21. It is fixed to the connector insertion part 33 through 50. The case 30, the connector 22, and the cover 40 are formed with adhesive receiving portions 25, 35, 45 that receive the adhesive 50 protruding upward from between the connector insertion portion 33 and the outer periphery of the connector 22. ing. Thereby, even if the excess adhesive 50 protrudes when fixing the connector 22 to the connector insertion part 33 via the adhesive 50, the excess adhesive 50 (adhesive hardening part 51) which protruded is adhesive. Since it is received by the receiving portions 25, 35, and 45, when the cover 40 is fixed to the side wall 32 of the case 30, the excess adhesive 50 that has hardened by protruding from between the connector insertion portion 33 and the outer periphery of the connector 22. And the cover 40 can be prevented from interfering with each other. Accordingly, it is possible to firmly fix the connector 22 and the cover to the case 30 with the adhesive 50 while keeping the assembly accuracy of the electronic circuit device 20 good.

  Further, if the adhesive receiving portion 35 is formed on the side wall 32 of the case 30 so as to be located on both sides of the connector 22 inserted into the connector insertion portion 33, the gap between the connector insertion portion 33 and the outer periphery of the connector 22 is determined. It is possible to more reliably receive the adhesive 50 protruding upward from the adhesive receiving portion 35. Further, if the adhesive receiving portion 25 is formed adjacent to the adhesive receiving portion 35 on the case 30 side in the connector 22, the adhesive protruding upward from between the connector insertion portion 33 and the outer periphery of the connector 22 is removed. The volume of the adhesive receiving part to be received can be further increased. Further, if the adhesive receiving portion 45 is formed so as to be positioned above both ends of the connector insertion portion 33 with respect to the cover 40, the cover 40 and the cover 40 are cured when the cover 40 is fixed to the side wall 32 of the case 30. It is possible to more reliably suppress the interference with the excess adhesive 50, that is, the adhesive curing portion 51. However, it is not always necessary to provide the adhesive receiving portion in all of the case 30, the connector 22 and the cover 40, and any one or two adhesive receiving portions of the case 30, the connector 22 and the cover 40 may be omitted. .

  Here, the correspondence between the main elements of the embodiments and the modified examples and the main elements of the invention described in the column of means for solving the problems will be described. That is, in the said Example, the case 30 which has the side wall 32 formed so that the outer periphery of the bottom part 31 and the bottom part 31 may be enclosed, the circuit board 21 accommodated in the case 30, and the connector connected to the circuit board 21 22 and a cover 40 fixed from above to the side wall 32 of the case 30 so as to cover the circuit board 21 corresponds to an “electronic circuit device”, and the connector 22 is inserted from above. The connector insertion portion 33 formed on the side wall 32 of the 30 corresponds to a “connector insertion portion”, and includes an adhesive receiving portion 35 formed on the case 30, an adhesive receiving portion 25 formed on the connector 22, and a cover 40. The adhesive receiving portion 45 formed in (1) corresponds to an “adhesive receiving portion”. However, the correspondence between the main elements of these embodiments and modifications and the main elements of the invention described in the column of means for solving the problem is described in the column of means for the embodiment to solve the problem. Therefore, the present invention is not limited to the elements of the invention described in the column of means for solving the problem. In other words, the examples are merely specific examples of the invention described in the column of means for solving the problem, and the interpretation of the invention described in the column of means for solving the problem is described in the description of that column. Should be done on the basis.

  The embodiments of the present invention have been described above using the embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. Needless to say.

  The present invention can be used in the electronic circuit device manufacturing industry.

  20 electronic circuit device, 21 circuit board, 22 connector, 23 engaging convex part, 24 connector side engaging concave part, 25, 35, 45 adhesive receiving part, 30 case, 31 bottom part, 32 side wall, 33 connector insertion part, 34 Case side engagement concave part, 35 Adhesive receiving part, 40 Cover, 41 Lid part, 42 Outer peripheral wall, 44 Convex part, 45 Adhesive receiving part, 50 Adhesive, 51 Adhesive hardening part.

Claims (7)

A case having a bottom and a side wall formed so as to surround an outer periphery of the bottom; a circuit board housed in the case; a connector connected to the circuit board; and the case so as to cover the circuit board And an electronic circuit device including a cover fixed from above.
The side wall of the case is formed with a connector insertion portion into which the connector is inserted from above, and the connector is fixed to the connector insertion portion via an adhesive, and the case, the connector, and the At least one of the covers is formed with an adhesive receiving portion for receiving the adhesive protruding upward from between the connector insertion portion and the outer periphery of the connector. apparatus. The electronic circuit device according to claim 1,
The electronic circuit device according to claim 1, wherein the adhesive receiving portion is formed on the side wall of the case so as to be positioned on both sides of the connector inserted into the connector insertion portion. The electronic circuit device according to claim 1 or 2,
The electronic circuit device, wherein the connector includes an adhesive receiving portion formed adjacent to the adhesive receiving portion on the case side. In the electronic circuit device according to any one of claims 1 to 3,
The electronic circuit device according to claim 1, wherein an adhesive receiving portion is formed on the cover so as to be positioned above both ends of the connector insertion portion. The electronic circuit device according to claim 2,
A case-side engaging recess is formed on the side wall of the case so as to be recessed from the upper end surface toward the bottom side, and a convex portion that can be engaged with the case-side engaging recess is formed on the inner surface of the cover. And
The electronic circuit device according to claim 1, wherein the adhesive receiving portion is a concave portion deeper than the case-side engaging concave portion that engages with the convex portion of the cover. The electronic circuit device according to claim 5,
The connector is formed as a connector-side engagement recess that can be engaged with the projection of the cover, and a recess deeper than the connector-side engagement recess so as to be located on both sides of the connector-side engagement recess. An electronic circuit device comprising an agent receiving portion. The electronic circuit device according to claim 5 or 6,
The electronic circuit device according to claim 1, wherein an adhesive receiving portion is formed on the cover by denting at least the convex portions located above both ends of the connector insertion portion.

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