JP2017168695A - Electronic controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic controller capable of reducing the cost by commonizing the design, regardless of whether or not there is a waterproof structure.SOLUTION: In a state where a circuit board 30 is housed in a case 10, and one end side opening 10a of the case 10 is closed by a connector 20 consisting of the connector body 21 and a flange wall 22, multiple insertion pins 15 projecting from the opening side end face 10b of the case 10 are inserted into insertion holes 25 penetrating the flange wall 22, and a reinforcement plate 16 projecting from the outer peripheral edge of the one end side opening 10a of the case 10 so as to face vertically, and deformable flexibly with the base side as a fulcrum, projects over the flange wall 22.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electronic control device that is mounted, for example, outside a vehicle interior of an automobile and used to control an internal combustion engine or the like.

  As a conventional electronic control device, for example, one described in Patent Document 1 below is known.

  That is, the electronic control device is configured such that the opening of the bottomed rectangular tube-like case in which the circuit board is accommodated is opened by the connector connected to the circuit board and the cover surrounding the outer peripheral side of the connector. The part is closed and a so-called snap-fit structure is adopted for fixing the case.

JP 2005-150545 A

  However, since the conventional electronic control device employs a snap-fit structure for fixing the cover, when the waterproof seal is interposed between the case and the cover, the waterproof seal can be interposed. The case and the cover need to be manufactured separately, which has led to an increase in manufacturing costs such as mold costs for manufacturing the case and the cover.

  The present invention has been devised in view of such technical problems, and an object of the present invention is to provide an electronic control device that can reduce the cost by sharing the design regardless of the presence or absence of a waterproof structure.

  The present invention provides a substantially cylindrical case in which one end side is formed with an opening and the other end side is closed, and at least an opening end is formed of a resin material, and a circuit board that is accommodated in the case and on which an electronic component is mounted. And a connector pin to be connected to the circuit board, a connector for connection to an external device, a flange wall that extends to an outer peripheral area of the connector and closes the opening of the case together with the connector, A groove formed in one of the opening end surface of the case and the facing end surface of the flange wall facing the opening end surface; and a resin projecting from the opening end surface of the case along the opening direction of the opening end surface A first protrusion made of material, an insertion hole formed through the flange wall and through which the first protrusion is inserted, and an outer peripheral edge of the opening end of the case along the opening direction of the opening end Established A second projecting portion formed so as to be able to bend and deform with the base side as a fulcrum, in a state where the circuit board is accommodated in the case and the opening of the case is closed by the connector and the flange wall The first protrusion is inserted into the insertion hole, and the second protrusion protrudes beyond the flange wall.

  According to the present invention, when the waterproof seal structure is adopted, the sealing material can be filled in the groove portion, whereby contamination can be prevented from entering the case by the seal material. At this time, the connector can be caulked and fixed to the case by melting the tip side of the first projecting portion that has penetrated the flange wall through the insertion hole. For example, when the snap-fit structure is adopted, the connector is fixed. There is no risk of adversely affecting the sealing material, such as the sealing material flowing out of the groove due to vibrations that are sometimes generated, and the case and the flange wall can be well sealed.

  On the other hand, when the waterproof seal structure is not adopted, the tip of the second projecting portion is formed in a bowl shape and is engaged with the edge of the flange wall on the side opposite to the case by using the bending deformation of the second projecting portion. By using a so-called snap-fit structure, in addition to abolishing the sealing material, the fixing operation of the connector becomes easy, and the manufacturing cost of the electronic control device can be further reduced.

  In this way, by sharing the basic structure of the case and the flange wall regardless of the presence or absence of the waterproof seal structure, there is no need to prepare a mold for forming the case and the flange wall according to the presence or absence of the waterproof seal structure. The manufacturing cost concerning the apparatus can be reduced.

  In adopting the snap-fit structure, by using a case mold as a nested mold, the mold can be shared, and the manufacturing cost can be reduced.

1 is an exploded perspective view of an electronic control device according to a first embodiment of the present invention. It is a perspective view which shows the assembly state of the electronic control apparatus shown in FIG. It is the sectional view on the AA line of FIG. It is an expanded sectional view of the base part vicinity of the electronic control apparatus shown in FIG. It is a principal part enlarged view of the BB line cross section of FIG. It is a figure which shows the penetration pin part which concerns on the embodiment, Comprising: (a) is a principal part enlarged view of FIG. 1, (b) is the arrow line view seen from the C direction of the figure (a). It is a figure which shows the other example of the form of an insertion pin part, Comprising: (a) is a principal part enlarged view of FIG. 1, (b) is the arrow line view seen from the C direction of the same figure (a). It is a principal part enlarged view of FIG. It is a figure which shows the manufacturing process (assembly process) of the electronic control apparatus which concerns on the embodiment, (a) is the state before insertion of a circuit board, (b) is the state immediately after insertion of a circuit board, (c) is It is a longitudinal cross-sectional view of the electronic control apparatus showing the state after caulking of an insertion pin part. It is a disassembled perspective view of the electronic control apparatus which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the assembly state of the electronic control apparatus shown in FIG. It is the sectional view on the AA line of FIG. It is a principal part enlarged view of FIG. It is a figure which shows the manufacturing process (assembly process) of the electronic control apparatus which concerns on the embodiment, Comprising: (a) is the state before insertion of a circuit board, (b) is the state just before fixing of a connector, (c) is a connector It is a longitudinal cross-sectional view of the electronic control apparatus showing the state immediately after fixing.

  Hereinafter, an embodiment of an electronic control device according to the present invention will be described in detail with reference to the drawings. In the following embodiments, the electronic control device is applied to an electronic control device mounted on an automobile as in the conventional case.

[First Embodiment]
[Configuration of electronic control unit]
1 to 9 show a first embodiment of an electronic control device according to the present invention. As shown in FIGS. 1 to 3, the electronic control device 1 is disposed in a substantially square cylindrical case 10 and is not shown. And is fixed to the vehicle body via a bracket or the like not shown in the form of being exposed in the engine room of an automobile not shown. Be placed.

  The case 10 is formed of a predetermined resin material as a whole, and has a substantially bottomed rectangular tube shape with one end opened and the other end closed. Then, the one end side opening 10 a of the case 10 is closed by the connector 20 connected to the circuit board 30.

  Further, the one end side opening portion 10a of the case 10 is provided with a thick edge portion 11 formed by enlarging the peripheral edge portion in a stepped shape. The thick edge portion 11 has an opening side end face 10b facing a flange wall 22 (to be described later) of the connector 20 formed in a substantially flat shape in the circumferential direction. A series of groove portions 12 filled with a sealing material 13 used for waterproofing and dustproofing at a joint portion between the connector 10 and the connector 20 are notched over the entire circumference.

  That is, a ridge 26 that projects from the connector 20 (a flange wall 22 described later) in a state in which the sealing material 13 is filled is inserted into the groove 12, and the groove 12 is interposed between the groove 12 and the ridge 26. By interposing the sealing material 13, the joint between the case 10 and the connector 20 is hermetically sealed (see FIGS. 5 and 8). Thereby, intrusion of moisture and contamination into the case 10 can be suppressed, and the electronic control device 1 can be arranged outside the passenger compartment as in the present embodiment. Therefore, the layout of the electronic control device 1 (free layout) Degree of improvement).

  In addition, from the above-described configuration, the sealing material 13 is not limited to any particular composition as long as it is a curable liquid sealing material having fluidity before curing, such as epoxy, silicone, acrylic, etc. It can be freely selected according to the specifications of the device 1.

  Further, the thick edge portion 11 is slightly higher than the opening-side end surface 10b at intermediate positions of the upper side portion 11a, the lower side portion 11b, the left side portion 11c, and the right side portion 11d. A pedestal portion 14 that is formed in a stepped convex shape and forms a predetermined gap C1 between the connector 20 (flange wall 22) and the inner edge of the groove portion 12 is provided, and these pedestal portions 14 are described later. Insertion pin portions 15, which are first projecting portions configured to be able to be inserted through the respective insertion holes 25, are provided so as to project toward the connector 20 side.

  The pedestal portion 14 is provided on the outer peripheral side of the thick edge portion 11 so as to be offset in a substantially arc convex shape, and is configured to avoid interference between the insertion pin portions 15 and the groove portions 12. Thereby, the said groove part 12 is linearly formed in each said edge part 11a-11d with a fixed groove width in the circumferential direction.

  As shown in FIGS. 4 and 6, the insertion pin portions 15 are formed in substantially the same diameter over the entire region in the projecting direction at the substantially center of the pedestal portion 14. 25 so as to be slightly smaller in diameter than 25. Then, after each insertion pin portion 15 is inserted into each insertion hole 25, as shown in FIG. 5 in particular, the distal end side that penetrates each insertion hole 25 is thermally melted and crushed. By applying a so-called thermal caulking process that locks the melted portion 15a crushed into the back side hole edge 25a that is the hole edge on the side opposite to the case 10 of each insertion hole 25, the case 10 and the connector 20 Are fixed integrally.

  In the present embodiment, from the viewpoint of formability, the insertion pin portions 15 are formed to have the same diameter, but the embodiment is not limited thereto. In other words, from the viewpoint of the insertion property to the insertion hole 25 described later, as shown in FIG. 7, it is possible to arbitrarily change according to the purpose and specifications, such as forming the outer peripheral side of the tip portion in a conical taper shape.

  In addition to the insertion pin portions 15, the upper side portion 11 a and the lower side portion 11 b of the thick edge portion 11 are second projecting portions on both sides of the insertion pin portions 15. The reinforcing plate portions 16 project toward the connector 20 so as to be substantially parallel in the vertical direction (so as to face each other in the vertical direction).

  Each of the reinforcing plate portions 16 has a flat plate shape formed with a certain thickness width capable of suppressing the bending deformation of the thick edge portion 11 which is thinned by the formation of the groove portion 12, and the thick edge portion 11. The upper side 11a and the lower side 11b are extended from the rear ends of the sides 11a and 11b so as to be substantially horizontal and substantially parallel to the upper and lower sides of the side 11a and 11b. It is comprised so that it may straddle the flange wall 22 mentioned later.

  Here, the vertical distance between the reinforcing plate portions 16 is set to be slightly larger than the vertical width dimension of the flange wall 22, and the insertion pin portions 15 will be described later by the reinforcing plate portions 16. The flange wall 22 can be guided (supported) when being inserted into each insertion hole 25.

  Further, a substantially circular breathing hole 17 is formed through the upper wall of the case 10 as shown in FIG. 1, and the breathing hole 17 has a case 10 as shown in FIGS. A well-known breathing filter 18 for adjusting the internal / external pressure difference is provided.

  The circuit board 30 is a so-called printed wiring board, and is a wiring circuit pattern (not shown) made of a plurality of conductor patterns on the front and back surfaces and inside of a board made of a non-conductive resin material typified by glass epoxy resin. The electronic circuit (not shown) is electrically connected to the wiring circuit pattern by solder or the like.

  Further, as shown in FIGS. 1 and 3, a connector 20 for electrical connection with an external device not shown is integrally provided at one end of the circuit board 30. The connector 20 is attached and fixed to one end side of the circuit board 30, and extends to the outer peripheral area of the connector body 21, and closes the one end side opening 10 a of the case 10 together with the connector body 21. A flange wall 22, and is fixedly attached to the case 10 via the flange wall 22.

  The connector main body 21 has a substantially rectangular tube shape made of a predetermined resin material, and receives a mating connector (not shown) on the external device side, and a proximal end opening of the cylindrical portion 21a. And a plurality of connector pins 23, which are male terminals electrically connected to the wiring circuit pattern (not shown), are inserted into the partition wall 21b.

  The flange wall 22 is integrally formed of the same predetermined resin material as that of the connector main body 21 so as to extend in a flange shape on the outer periphery of the base end portion of the connector main body 21, and is substantially the same as the opening-side end face 10 b of the case 10. It is configured to polymerize without excess or deficiency. The upper side 22a, the lower side 22b, the left side 22c and the right side 22d constituting the outer peripheral edge of the flange wall 22 are respectively overlapped with the pedestals 14 at intermediate positions. Insertion hole forming portions 24 that are substantially arcuate in shape are projected, and insertion holes 25 through which the respective insertion pin portions 15 are inserted are formed at substantially central positions of the respective insertion hole forming portions 24. .

  Further, on the flange wall 22, a protrusion 26, which is a series of protrusions configured in a substantially annular shape that can engage with the groove 12, protrudes over the entire circumference at a position facing the groove 12 of the case 10. Since the protrusion 26 is formed and engages with the groove portion 12 filled with the sealing material 13, the joint portion between the case 10 and the connector 20 is hermetically sealed.

  In this way, by inserting the protrusion 26 into the sealing material 13 filled in the groove 12, it becomes possible to secure a longer seal length between the case 10 and the flange wall 22, and the case 10 and the connector 20 can be secured. This is used to improve the sealing performance at the joint portion of the (flange wall 22).

  Therefore, the protrusion 26 has a thickness width smaller than the groove width of the groove portion 12 and is set to a protruding amount smaller than the depth of the groove portion 12 and is inserted at a substantially central position of the groove portion 12. Accordingly, a sufficient amount of the sealing material 13 is interposed between the groove 12 and the entire outer peripheral surface of the protrusion 26.

[Method of manufacturing electronic control unit]
Below, the manufacturing method (assembly method) of the electronic control apparatus 1 which concerns on this embodiment is demonstrated based on FIG.

  First, as shown in FIG. 9 (a), a circuit board 30 having one end connected and fixed to the connector 20 and integrally formed with the connector 20, and a case 10 in which a groove 12 is previously filled with a sealing material 13 are provided. It inserts in the one end side opening part 10a.

  Specifically, as shown in FIG. 9B, the insertion hole forming portions 24 of the flange wall 22 are inserted into the insertion holes 25 of the connector 20 while the insertion pin portions 15 of the case 10 are inserted into the insertion holes 25. The connector 20 is pushed in until it contacts the pedestals 14 of the case 10.

  The insertion pin portions 15 of the case 10 pass through the insertion holes 25 of the connector 20, and the insertion hole forming portions 24 of the flange wall 22 are in contact with the pedestal portions 14 of the case 10. As shown in FIG. 9 (c), the front end side of each of the insertion pin portions 15 penetrating each of the insertion holes 25 is thermally melted, so that the melting portion 15 a becomes the back side hole edge 25 a of each insertion hole 25. The electronic control device 1 is completed by fixing the connector 20 to the case 10 by heat caulking.

[Effects of this embodiment]
Below, the characteristic thing is demonstrated among the effects of the electronic control apparatus 1 which concerns on this embodiment.

  In the conventional electronic control device, since a so-called snap-fit structure is employed for fixing the cover holding the connector, it is necessary to adopt a waterproof structure in which a waterproof seal is interposed between the joint surface of the case and the cover Therefore, it is necessary to separately prepare a case and a cover that can be provided with the waterproof seal, and this has led to an increase in manufacturing cost such as a mold cost for manufacturing the case and the cover.

  On the other hand, in the electronic control device 1 according to the present embodiment, since the groove portion 12 is provided on the opening side end surface 10b of the case 10 facing the flange wall 22 of the connector 20, a waterproof seal structure is employed. The filling of the groove portion 12 with the sealing material 13 can suppress the entry of moisture and contamination into the case 10 by the sealing material 13.

  When such a waterproof seal structure is employed, the insertion pin portions 15 are provided on the opening-side end surface 10 b of the case 10, and the insertion holes 25 are formed through the flange wall 22 of the connector 20. The connector 20 can be caulked and fixed to the case 10 by thermally melting the distal end side of each insertion pin portion 15 that has penetrated the flange wall 22 through each insertion hole 25. For example, the conventional snap-fit structure Thus, the gap between the case 10 and the flange wall 22 can be satisfactorily sealed without adversely affecting the sealing material 13 such as the sealing material 13 flowing out of the groove portion 12 due to vibration generated during fixing.

  On the other hand, when the waterproof seal structure is not employed, the sealing material 13 may be eliminated, and therefore it is not necessary to separately prepare the case 10 depending on the presence or absence of the waterproof seal structure. That is, the case 10 can be made common regardless of the presence or absence of the waterproof seal structure, and the manufacturing cost of the electronic control device 1 can be reduced.

  Furthermore, since each insertion pin portion 15 is configured to be inserted into each insertion hole 25, even when deformation or distortion occurs in the one end side opening 10 a (thick edge portion 11) of the case 10, By inserting the insertion pin portions 15, the deformation and distortion of the thick edge portion 11 can be corrected. Thereby, the adhesiveness of case 10 and the flange wall 22 improves, and the penetration | invasion of the contamination etc. from the outside can be suppressed more effectively.

  In addition, by inserting the insertion pin portions 15 into the insertion holes 25, the insertion pin portions 15 function as guides when the circuit board 30 is inserted into the case 10. As a result, the electronic control device 1 Assembling workability can be improved.

  Further, by providing the reinforcing plate portion 16 on the thick edge portion 11 of the case 10, it is possible to increase the rigidity of the thick edge portion 11 in which the groove portion 12 is recessed. Deformation and distortion can be suppressed. Thereby, the insertion property of each insertion pin portion 15 into each insertion hole 25 is improved, the assembly workability of the electronic control device 1 is improved, and the adhesion between the case 10 and the flange wall 22 is also improved. Thus, it is possible to more effectively suppress the entry of contamination and the like from the outside.

  Further, in the present embodiment, the groove portion 12 is filled with a curable liquid sealing material 13, and the case 10 and the flange wall 22 are connected via the sealing material 13, and are inserted into the insertion holes 25. The distal end sides of the respective insertion pin portions 15 are thermally melted and are in close contact with the hole edges of the respective insertion holes 25 with a diameter larger than that of the respective insertion holes 25. For this reason, the positional deviation between the case 10 and the flange wall 22 is suppressed, and the stress load on the sealing material 13 can be reduced. As a result, the spread and damage of the sealing material 13 before curing can be suppressed.

  Further, the case 10 and the flange wall 22 are formed by adopting a configuration in which the conventional snap-fit structure is not adopted as the case 10 and the flange wall 22 are joined by thermally melting the insertion pin portions 15. The impact acting on the sealing material 13 when combined is also suppressed, and the deterioration of the sealing material 13 and the deterioration of the sealing performance can be suppressed.

  Further, in the present embodiment, a protrusion 26 is provided on the opposite end surface of the flange wall 22 facing the opening side end surface 10 b of the case 10, and the protrusion 26 is inserted into the sealing material 13 filled in the groove portion 12. Yes. On the other hand, in the present embodiment, the distal end side of each insertion pin portion 15 inserted through each insertion hole 25 is in close contact with the edge of each insertion hole 25 by thermal melting (thermal crimping). As a result of the positional deviation between the case 10 and the flange wall 22 being suppressed, there is no possibility that the protrusion 26 contacts the inner surface of the groove portion 12, and good sealing performance by the sealing material 13 can be ensured.

  Furthermore, the stress acting on the direction in which the protrusion 26 is detached from the groove portion 12 is relieved by the fastening force by the thermal caulking that the tip side of each insertion pin portion 15 is in close contact with the hole edge of each insertion hole 25 by thermal melting. Therefore, there is an advantage that the deterioration of the sealing material 13 can be suppressed.

  Further, in the present embodiment, a protrusion 26 is provided on the opposite end surface of the flange wall 22 facing the opening-side end surface 10b of the case 10, and the protrusion 26 is inserted into the sealing material 13 filled in the groove portion 12, The outer peripheral edge of the opening 10a on the one end side of the case 10 is provided with the pedestal portions 14 that are formed larger in diameter than the insertion pin portions 15 and on which the flange walls 22 are seated. A gap C <b> 1 is formed between the flange wall 22 and the inner edge of the groove portion 12 in a state of being seated on the portion 14. As a result, even when the flange wall 22 is distorted or warped, it is possible to release such distortion or warpage to the gap C1 and suppress rattling of the connector 20 caused by the distortion or warpage. be able to.

  Furthermore, by letting the distortion and warpage of the flange wall 22 escape to the gap C1, the insertion depth of the protrusion 26 with respect to the sealing material 13 is also stabilized, and good sealing performance can be ensured.

[Second Embodiment]
10 to 13 show a second embodiment of the electronic control device according to the present invention, in which the fixing means for the case 10 and the connector 20 according to the first embodiment is changed. Since the basic configuration other than the change is the same as that in the first embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

[Configuration of electronic control unit]
That is, the electronic control device 2 according to the present embodiment is applied to an electronic control device that does not require a waterproof seal structure, for example, when the electronic control device 2 is disposed in a vehicle interior. Then, as shown in FIGS. 10 to 13, the insertion pin portions 15 are only inserted into the insertion holes 25, and the heat caulking fixing by the insertion pin portions 15 is abolished. At the front end of the plate portion 16, a hook-like portion 19 having a locking portion 19 a that can be locked to the upper end edge and the lower end edge on the back side, which is the edge on the side opposite to the case 10 of the flange wall 22, is provided.

  The hook-shaped portion 19 has an inclined surface 19b that descends from the outer peripheral side to the inner peripheral side of the one end side opening 10a of the case 10 from the distal end side toward the locking portion 19a side. 19a side is comprised so that it may become wider than the general part 16a of each said reinforcement board part 16. As shown in FIG.

  In forming the bowl-shaped portion 19, the mold for the case 10 according to the first embodiment is a nested mold so that the mold is shared with the case 10 according to the first embodiment. can do.

  Moreover, in this embodiment, from the relationship which employ | adopts the said non-waterproof structure, the filling of the sealing material 13 to the said groove part 12 is abolished, and it has the structure that only the protrusion 26 is inserted in the groove part 12. With this configuration, a gap C2 formed in a so-called labyrinth shape that is folded back into a substantially U-shaped cross section in the groove portion 12 is defined (see FIG. 13).

[Method of manufacturing electronic control unit]
Below, the manufacturing method (assembly method) of the electronic control apparatus 2 which concerns on this embodiment is demonstrated based on FIG.

  First, as shown in FIG. 14A, one end of the case 10 in which the groove portion 12 is filled with the sealing material 13 in advance is connected to the circuit board 30 that is connected and fixed to the connector 20 at one end side. It inserts in the side opening part 10a.

  Specifically, the insertion hole forming portions 24 of the flange wall 22 contact the pedestal portions 14 of the case 10 while the insertion pin portions 15 of the case 10 are inserted through the insertion holes 25 of the connector 20. The connector 20 is pushed in until it comes into contact.

  At this time, when the upper end edge and the lower end edge of the flange wall 22 approach the tip of the flange-shaped portion 19 of each reinforcing plate 16 in the insertion process, as shown in FIG. The respective hook-like portions 19 are pushed and spread along the inclined surfaces 19b of the respective hook-like portions 19, and the respective reinforcing plate portions 16 are bent and deformed so as to tilt outward with the base end side as a fulcrum.

  And when the said flange wall 22 arrives at the latching | locking part 19a of each said hook-shaped part 19, as shown in FIG.14 (c), each insertion hole formation part 24 of the flange wall 22 is each pedestal part of case 10. As shown in FIG. 14 and the respective locking portions 19a are locked to the upper and lower edges of the flange wall 22 on the back side, whereby the electronic control device 2 is completed.

[Effects of this embodiment]
Below, the characteristic thing among the effects of the electronic control apparatus 2 which concerns on this embodiment is demonstrated.

  That is, in the electronic control device 2 according to the present embodiment, while adopting a non-waterproof seal structure in which the seal material 13 is eliminated, the basic configuration of the case 10 such as the insertion pin portions 15 and the reinforcing plate portions 16 is as follows. By using the waterproof seal structure according to the first embodiment in common, the manufacturing cost of the electronic control device 2 can be reduced.

  In addition, in the electronic control device 2 that does not employ the waterproof seal structure, a hook-like portion 19 is provided at the distal end portion of each reinforcing plate portion 16 that is configured to be able to bend and deform with a base end portion as a fulcrum. The connector 20 is fixed to the case 10 by using a so-called snap-fit structure in which the locking portion 19a of the portion 19 is locked to the upper end edge and the lower end edge on the back side which is the opposite edge of the flange wall 22 on the case 10 side. It can be done easily.

  In adopting such a snap-fit structure, it is possible to achieve a common mold with the case 10 according to the first embodiment by using a mold for the case 10 as a nested mold. The manufacturing cost of the electronic control device 2 can be reduced.

  Further, each of the reinforcing plate portions 16 is configured to suppress the deformation of deformation on the base side by securing a relatively large amount of bending on the distal end side with the base end side as a fulcrum. There is an advantage that the load acting on the thick edge portion 11 of the case 10 (particularly the outer wall of the groove portion 12) can be reduced along with the fixation.

  Moreover, even when not adopting the waterproof seal structure as in the present embodiment, the provision of the groove portion 12 can ensure a long distance from the outer peripheral edge to the inner peripheral edge of the one end side opening 10a of the case 10. Contaminants and the like can be collected in the groove portion 12 and used to suppress the entry of contaminants and the like into the case 10. As a result, unintentional continuity and short circuit on the wiring circuit pattern of the circuit board 30 can be suppressed.

  Furthermore, since the U-shaped gap C2 is defined by inserting the ridge 26 into the groove portion 12, it is more effective to infiltrate contamination from the outside as in the so-called labyrinth structure. Can be suppressed.

  As mentioned above, this embodiment only illustrated what comprised the said electronic control apparatus 2 most simply, and an application object is not limited to the thing of a non-waterproof structure. In other words, waterproofing may be achieved by filling the groove portion 12 with the sealing material 13 in the same manner as in the first embodiment while adopting the snap-fit structure as described above.

  The present invention is not limited to the configuration of each of the embodiments described above, and can be freely changed according to the specifications and costs of the application target as long as the above-described effects of the present invention can be achieved. .

  In particular, in each of the above embodiments, the groove portion 12 is provided on the opening-side end surface 10b of the case 10 and the protrusion 26 is provided on the opposing flange wall 22, but the groove portion 12 is provided on the connector 20 side, It is good also as a structure which provides the protrusion 26 in this.

  As the electronic control device based on the above-described embodiment, for example, the following modes can be considered.

  That is, such an electronic control device has an approximately cylindrical case in which one end side is formed with an opening and the other end side is closed, and at least an opening end portion is formed of a resin material. A circuit board, a connector pin connected to the circuit board, a connector provided for connection with an external device, and an outer peripheral area of the connector, and closes the opening of the case together with the connector A flange wall, a groove formed in one of the opening end face of the case and the facing end face of the flange wall facing the opening end face, and the opening end face of the case along the opening direction of the opening end face A first projecting portion made of a resin material, an insertion hole formed through the flange wall and through which the first projecting portion is inserted, and an outer peripheral edge of the opening end portion of the case. A second projecting portion projecting along the mouth direction and formed so as to be able to bend and deform with the base side as a fulcrum, and the circuit board is accommodated in the case, and the opening of the case is the connector and the flange The first projecting portion is inserted into the insertion hole while being blocked by a wall, and the second projecting portion projects beyond the flange wall.

  In a preferred aspect of the electronic control device, the groove is filled with a curable liquid sealing material, the case and the flange wall are connected via the sealing material, and the first protrusion is inserted through the insertion hole. The tip end side of the portion is melted by heat, and is in close contact with the edge of the through-case side hole of the insertion hole in a state where the diameter is larger than that of the insertion hole by the heat melting.

  In another preferred aspect, in any one of the aspects of the electronic control device, a protrusion that engages with the groove is provided on the other of the opening end surface of the case and the facing end surface of the flange wall that faces the opening end surface. The protrusion is provided and inserted into the sealing material filled in the groove.

  In still another preferred aspect, in any one of the aspects of the electronic control device, a protrusion that engages with the groove is provided on the other of the opening end face of the case and the opposite end face of the flange wall that faces the opening end face. The protrusion is inserted into the sealing material filled in the groove, and is formed on the outer peripheral edge of the opening of the case to have a larger diameter than the first protrusion, and the flange A pedestal portion for seating on the wall is provided, and a gap is formed between the flange wall and the inner edge of the groove portion in a state where the flange wall is seated on the pedestal portion.

  In still another preferred aspect, in any one of the aspects of the electronic control device, an inner periphery from an outer peripheral side of the opening portion of the case toward a proximal end side of the second protruding portion is provided at a distal end portion of the second protruding portion. An inclined surface that is inclined downward to the side, and is provided with a flange-like portion formed thicker than the general portion of the second projecting portion by the inclination, and the flange-like portion is on the opposite side of the flange wall from the case The connector is fixed to the case by engaging with an end edge.

10 ... Case 12 ... Groove part 15 ... Insertion pin part (first protrusion)
16 ... Reinforcing plate (second protrusion)
21 ... Connector body (connector)
22 ... Flange wall 23 ... Connector pin 25 ... Insertion hole 30 ... Circuit board

Claims (3)

A substantially cylindrical case in which one end side is opened and the other end side is closed, and at least the opening end is formed of a resin material;
A circuit board housed in the case and mounted with electronic components;
A connector pin connected to the circuit board, and a connector for connection to an external device;
A flange wall extending in an outer peripheral area of the connector and closing the opening of the case together with the connector;
A groove formed in either one of the opening end surface of the case and the facing end surface of the flange wall facing the opening end surface;
A first projecting portion made of a resin material projecting from the opening end surface of the case along the opening direction of the opening end surface;
An insertion hole formed through the flange wall and through which the first protrusion is inserted;
A second protrusion formed on the outer peripheral edge of the opening end of the case along the opening direction of the opening end, and formed to bend and deform with the base side as a fulcrum;
With
In a state where the circuit board is accommodated in the case and the opening of the case is closed by the connector and the flange wall, the first protrusion is inserted into the insertion hole, and the second protrusion is An electronic control device configured to protrude beyond a flange wall. The groove is filled with a curable liquid sealing material, and the case and the flange wall are connected via the sealing material,
The front end side of the first projecting portion inserted through the insertion hole is thermally melted, and in close contact with the opposite case side hole edge of the insertion hole in a state where the diameter is larger than that of the insertion hole by the heat melting. The electronic control device according to claim 1, wherein The distal end portion of the second projecting portion has an inclined surface that inclines downward from the outer peripheral side of the opening portion of the case toward the inner peripheral side toward the proximal end side of the second projecting portion. A hook-shaped part formed thicker than the general part of the protrusion is provided,
The electronic control device according to claim 1, wherein the connector is fixed to the case by the hook-like portion being engaged with an edge of the flange wall opposite to the case.

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