JP2012070508A - Electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic control device in which a projection of a cover joining face can be properly engaged with a seal groove of a case joining face.SOLUTION: First to fourth positioning fixation walls 31-34 are erected at the corner of a case 12 which accommodates a circuit board 11, while first to fourth positioning fixation pieces 41-44 for positioning a cover 13 relative to the case 12 by getting engaged with an inside face 37a of the positioning fixation walls 31-34 are provided on the cover 13 which is externally fitted to the case 12 to cover the circuit board 11. The positioning fixation pieces 41-44 are made to engage with the positioning fixation walls 31-34 before a fixing projection 39 provided on a bottom face 38a of a clamp part 38, or a joining face of the cover 13, touches adhesive 30 filled in a seal groove 27 provided on a clamp face 26, or a joining face of the case 12, in which way the case 12 and the cover 13 are positioned in place.

Description

  The present invention relates to an electronic control device mounted on, for example, an automobile and used for controlling an engine, a brake, and the like.

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

  In brief, in this electronic control device, a pair of positioning projections are provided at diagonal corners of the joint surface of the case, and the positioning projections provided on the joint surface of the cover on the pair of positioning projections. By associating the cut-out portion, the cover is positioned with respect to the case, thereby improving the assembly of the apparatus.

JP 2010-57345 A

  Here, in an electronic control device that may be exposed to moisture such as being placed in the engine room, the seal groove provided on the case joint surface is filled with a seal material, and the seal groove filled with the seal material is covered. By engaging a protrusion provided on the joint surface, a sealing material is interposed between the case and the cover, thereby preventing moisture from entering the housing.

  However, since the positioning according to the conventional electronic control device is not considered at all for engaging the protrusion into the seal groove, when the protrusion is engaged with the engagement groove, There is a possibility that the seal material in the seal groove may be scraped off by the protrusions, which causes a problem that sufficient waterproofing cannot be achieved.

  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 capable of appropriately engaging the protrusion on the cover joint surface with the seal groove on the case joint surface. Yes.

  The present invention provides a first member having a seal groove on its joint surface and a second member having a protrusion engaging with the seal groove on its joint surface via a seal material filled in the seal groove. In the electronic control device in which the circuit board is accommodated in the casing formed by joining the first member and the second member before the protrusion contacts the sealing material filled in the sealing groove. It is characterized in that positioning means for positioning the member is provided.

  According to the present invention, by providing the positioning means, it is possible to allow the protrusion to enter the seal groove in a state where the first member and the second member are positioned. Accordingly, when the apparatus is assembled, the ridge can be appropriately entered into the seal groove, and as a result, it is possible to suppress a problem that the ridge scrapes the adhesive in the seal groove.

It is the perspective view which looked at the electronic control unit concerning the present invention from the front side. It is the perspective view which looked at the electronic control unit concerning the present invention from the back side. FIG. 2 is an exploded perspective view of the electronic control device shown in FIG. 1. FIG. 3 is an exploded perspective view of the electronic control device shown in FIG. 2. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a principal part enlarged view of FIG. It is CC sectional view taken on the line of FIG. FIG. 9 is a cross-sectional view corresponding to FIG. 8 showing a state in which a positioning fixing piece is positioned by a positioning fixing wall. It is sectional drawing which shows the normal clearance between the case and cover in FIG. It is sectional drawing which shows the minimum clearance between the case and cover in FIG. It is sectional drawing equivalent to FIG. 8 showing other embodiment of this invention. It is a disassembled perspective view equivalent to FIG. 3 showing other embodiment of the temporary fixing structure of a case and a cover. It is the DD sectional view taken on the line of FIG. 13 equivalent to FIG. 9 showing other embodiment of the temporary fixing structure of a case and a cover. It is a perspective view equivalent to FIG. 2 showing other embodiment of the radiation fin.

  Embodiments of an electronic control device according to the present invention will be described below in detail with reference to the drawings. In the following embodiment, the electronic control device is applied to automobile engine control.

  That is, in the electronic control device 10 according to the present embodiment, as shown in FIGS. 1 to 4, a circuit board 11 on which predetermined electronic components 14 are mounted on the front and back surfaces, and the circuit board 11 are housed and fixed. A metal case 12 (corresponding to the first member according to the present invention) and a cover that is fitted from above the case 12 so as to cover the circuit board 11 and constitutes the casing according to the present invention together with the case 12 13 (corresponding to the second member according to the present invention), and is mounted in an engine room or the like of the vehicle.

  As shown in FIGS. 3 and 4, the circuit board 11 is a so-called printed wiring board. For example, a wiring circuit pattern (not shown) is formed on the front and back surfaces of a plate material made of glass epoxy resin or the like. The electronic component 14 is electrically connected to the wiring circuit pattern by solder or the like.

  Here, as the electronic component 14, for example, a capacitor, a coil, a transistor, an IC, or the like is used. 3, 4, and 6 showing the electronic component 14, only the electronic components 14 a and 14 b (for example, MOS-FET, IC, etc.) having relatively high heat generation among these electronic components 14 are shown for convenience. Is illustrated.

  Further, a connector 15 having three first to third connection ports 16 to 18 respectively connected to an external connector (not shown) is attached to the circuit board 11 on a back surface 11b serving as a mounting surface for the case 12. It has been. The connector 15 is formed by integrating the connection ports 16 to 18 divided into three according to the connection destination through an attachment base 19 serving as a base, and through the attachment base 19. The circuit board 11 is fixed with a plurality of screws 20. As shown in FIGS. 2 and 4, the connector 15 includes a window portion 21 described later in which a series of connection ports 16 to 18 connected by the mounting base portion 19 are formed in the bottom wall 12 a of the case 12. And is connected to a connector (not shown) outside the case 12.

  As shown in FIG. 2, each of the connection ports 16 to 18 accommodates a plurality of male terminals 16a to 18a electrically connected to wiring circuit patterns outside the drawing. The male terminals 16a to 18a are connected to a plurality of female terminals housed in the connector not shown in the figure, whereby predetermined sensors such as sensors and pumps connected to the connector (female terminal) outside the figure are connected. It will be electrically connected to the equipment.

  As shown in FIGS. 3 and 4, the case 12 is integrally formed in a so-called box shape with a metal material having excellent heat dissipation such as iron or aluminum. Specifically, the case 12 has a substantially rectangular shape. First to fourth side walls 12b to 12e are erected on the outer peripheral edge (each side) of the bottom wall 12a, and are configured to open upward as a whole. The bottom wall 12 a of the case 12 is formed with a window portion 21 through which the connection ports 16 to 18 of the connector 15 are exposed to the outside of the case 12. By inserting the ports 16 to 18, the connection ports 16 to 18 protrude to the outside of the case 12.

  Further, as shown in FIG. 3, a plurality of board fixing portions 22 provided for fixing the circuit board 11 are erected on the inner side surface of the bottom wall 12 a of the case 12. Each of the board fixing portions 22 has a flat support surface 22a for supporting the circuit board 11 at its upper end, and each of the support faces 22a has a screw (not shown) used for fixing the circuit board 11. Is formed with a female screw hole 22b. With such a configuration, the circuit board 11 is fixed to each board by screwing the unillustrated screws, which are inserted into a plurality of screw insertion holes 11c provided at the outer peripheral edge of the circuit board 11, into the respective female screw holes 22b. It will be fixed to the case 12 while being supported by the portion 22.

  Further, on the inner side surface of the bottom wall 12 a of the case 12, a pair of first and second heat dissipations that are used to dissipate heat generated from the electronic components 14 (particularly the highly heat-generating electronic components 14 a and 14 b) in the circuit board 11. Bases 23a, 23b are provided in a protruding manner. As shown in FIG. 6, the first and second heat radiation bases 23a and 23b are arranged on the opposite side (front surface 11a) of the back surface 11b of the circuit board 11 when the circuit board 11 is assembled. The parts 14a and 14b are arranged so as to face predetermined areas on which the components 14a and 14b are mounted, and the predetermined areas are respectively disposed on the radiating bases 23a and 23b via the well-known first and second heat radiating sheets 24a and 24b, respectively. It comes to contact | abut arrangement | positioning. Here, each of the heat-dissipating sheets 24a and 24b may be, for example, heat-dissipating grease, and is not limited to a sheet-like material as long as it is a so-called heat conductive material.

  On the other hand, on the outer surface of the bottom wall 12a where the first and second heat radiation pedestals 23a and 23b are provided, first and second heat radiation fins 25a and 25b are provided for promoting heat radiation. As a result, the heat received by the radiating bases 23a and 23b is efficiently radiated and the cooling effect can be enhanced. In the present embodiment, the heat radiation fins 25a and 25b are provided along the longitudinal direction of the bottom wall 12a, that is, along the short side direction of the heat radiation bases 23a and 23b (FIG. 2, (See FIG. 4).

  Further, as shown in FIGS. 3 and 7, the case 12 includes a series of substantially flat mounting surfaces 26 used for mounting the cover 13 on the upper ends of the side walls 12 b to 12 e in the circumferential direction. A series of sealing grooves 27 filled with an adhesive 30 (corresponding to the sealing material according to the present invention) for fixing the case 12 and the cover 13 are cut out on the entire mounting surface 26. ing. That is, the fixing groove 39 described later provided on the cover 13 in a state where the adhesive 30 is filled is inserted into the sealing groove 27, and mainly the sealing groove 27 and the fixing groove are inserted. The case 12 and the cover 13 are fixed by adhering the protrusion 39 via the adhesive 30 (see FIG. 8).

  Here, the adhesive 30 is not particularly limited as long as it is a sealing material having fluidity. For example, epoxy, silicone, acrylic, etc., can be used as the specification of the electronic control device 10. You can choose freely according to your needs. Further, the adhesive 30 does not need to be filled in the seal groove 27, and is pushed into the gap L5 described later when the fixing protrusion 39 enters the seal groove 27, as will be described later. It is sufficient if the amount is sufficient.

  Further, on the outer side of the first and third side walls 12b and 12d in the case 12, as shown in FIGS. 1 to 4, a pair of first parts used for mounting the electronic control device 10 to a vehicle body (not shown). The second brackets 28 and 29 are integrally provided. The first bracket 28 is provided with a through hole 28a penetrating in the vertical direction, while the second bracket 29 is provided with a notch groove 29a that opens to the side. The through hole 28a and the notch Attachment to the vehicle body is performed with the groove 29a.

  Further, as shown in FIGS. 3 and 5, the first and second brackets 28 and 29 are provided with first and second engagement members 46a and 46b, which will be described later. Two engagement grooves 28b and 29b are formed in a notch. Here, each of the cutout grooves 28b and 29b is configured such that only the corresponding engagement protrusions 46a and 46b can be engaged with each other. That is, for example, the second engaging protrusion 46b is configured not to be engaged with the first cutout groove 28b, thereby preventing erroneous assembly of the case 12 and the cover 13.

  Further, as shown in FIGS. 3 and 7, the case 12 has a horizontal direction (horizontal rotation direction) of the cover 13 with respect to the case 12 at each corner (four corners) constituted by the side walls 12b to 12e. The first to fourth positioning fixing walls 31 to 34 (corresponding to the positioning and fixing means according to the present invention) for positioning are included and are configured integrally with the side walls 12b to 12e. In addition, since these positioning fixing walls 31 to 34 are all configured in the same shape, for the sake of convenience, only the first positioning fixing wall 31 is based on the illustrations of FIGS. This will be described below.

  That is, as shown in FIG. 7, the first positioning fixing wall 31 includes a first positioning wall 35 configured along the first side wall 12b and a second positioning wall 36 configured along the fourth side wall 12e. And a fixing wall 37 for connecting the positioning walls 35 and 36 to each other and for fixing the cover 13 to the case 12, and these are integrally formed.

  The first positioning wall 35 is engaged with a first engagement groove 45a of a first positioning fixing piece 41 described later provided on the cover 13, so that the first positioning wall 35 is located on the opposite side of the first positioning fixing wall 41. Along with the positioning wall 33a, the movement of the cover 13 in the long side direction (X-axis direction in FIG. 1) is mainly restricted (see FIG. 1).

  The second positioning wall 36 is engaged with a second engagement groove 45 b of a first positioning fixing piece 41 described later provided on the cover 13, so that the second positioning wall 36 of the third positioning fixing wall 33 that is positioned diagonally therewith is engaged. Along with the positioning wall 33b, the movement of the cover 13 in the short side direction (Y-axis direction in FIG. 1) is mainly restricted (see FIG. 1).

  As shown in FIGS. 7 to 9, the fixed wall 37 is positioned diagonally when the inner surface 37 a abuts on the outer surface 41 a of the first positioning fixed piece 41 described later provided on the cover 13. Together with the fixed wall 33c of the third positioning fixed wall 33, the cover 13 is mainly used for restricting the movement of the cover 13 in the diagonal direction (see FIG. 1).

  Further, a locking groove 37b configured to be locked to a locking projection 41b provided on the first positioning fixing piece 41 described later is formed at a predetermined position in the height direction on the inner side surface 37a of the fixed wall 37. (Corresponding to the locking portion according to the present invention) is drilled. Then, when the locking projection 41b is locked in the locking groove 37b, the movement of the cover 13 in the vertical direction (Z-axis direction in FIG. 1) with respect to the case 12 is restricted, and the first position located diagonally thereto. 3 The vertical movement of the cover 13 is restricted together with the fixed wall 33c of the positioning fixed wall 33 (see FIG. 1).

  Furthermore, the fixed wall 37 is provided with a tapered surface 37c that is inclined downward toward the inner side surface 37a at the inner upper end. In the present embodiment, the tapered surface 37c is formed smoothly. However, the tapered surface 37c is not necessarily smooth, and for example, the tapered surface 37c can be formed to have a convex arc shape outward.

  As shown in FIGS. 3 and 4, the cover 13 is integrally formed in a so-called box shape similar to the case 12 by a predetermined resin material that is lighter than a metal material, and has a substantially rectangular ceiling wall. The first to fourth side walls 13b to 13e are provided on the outer peripheral edge (each side edge) of 13a, and the whole is configured to open downward, covering the circuit board 11 accommodated and fixed in the case 12. As a result, the case 12 is assembled.

  As shown in FIGS. 3 and 7, the cover 13 has a series of mounting portions 38 facing the mounting surface 26 of the case 12 at the front ends of the first to fourth side walls 13 b to 13 e. As shown in FIGS. 4 and 8, a series of fixing ridges are formed in a substantially annular shape on the lower surface 38 a of the mounting portion 38 (the surface facing the mounting surface 26). 39 (corresponding to the protrusion according to the present invention) is formed so as to protrude over the entire circumference, and the fixing protrusion 39 engages with the seal groove 27 of the case 12 via the adhesive 30. 12 is fixed.

  As shown in FIGS. 8 and 9, the fixing protrusion 39 has a thickness width W 1 that is set sufficiently smaller than the groove width W 2 of the seal groove 27. A gap L6 is secured, and a sufficient amount of the adhesive 30 can be interposed with the gap L6. Further, the fixing protrusion 39 is set to be sufficiently smaller than the groove depth D1 of the seal groove 27 with respect to the protrusion amount L1, and the adhesive 30 may be cut in the seal groove 27. Is configured to not. That is, the protrusion amount L1 of the fixing protrusion 39 is set so that the tip of the fixing protrusion 39 does not contact the bottom of the seal groove 27, and the tip of the fixing protrusion 39 and the seal groove 27 It is possible to interpose a sufficient amount of adhesive between the bottom portion.

  Furthermore, the protrusion amount L1 of the fixing protrusion 39 is equal to or more than the distance L2 (the height width of the inner side surface 37a) from the lower end edge of the tapered surface 37c to the mounting surface 26 in the fixed wall 37. Is set to be smaller, that is, the relationship of “L1 ≦ L2” is established with the height width L2 of the inner side surface 37a. And, from such a configuration, the cover 13 is, for example, the first described below, at the same time or before the fixing protrusion 39 enters the adhesive 30 filled in the seal groove 27, or before entering. The horizontal positioning is performed with the first and third positioning and fixing walls 31 and 33 through the third positioning and fixing pieces 41 and 43.

  Further, as shown in FIGS. 3 and 7, the cover mounting portion 38 has first to fourth positioning fixings at the four corners thereof which face the first to fourth positioning fixing walls 31 to 34 of the case 12, respectively. The pieces 41 to 44 are extended and configured integrally with the cover 13. Since these positioning fixing pieces 41 to 44 are configured in the same shape as the positioning fixing walls 31 to 34, the configuration thereof is illustrated in FIGS. 7 to 9 for the sake of convenience. Only the first positioning and fixing piece 41 will be described below.

  That is, as shown in FIG. 7, the first positioning and fixing piece 41 is erected so as to be bent at a substantially right angle with respect to the mounting surface 26, and its outer surface 41 a is a fixing wall according to the first positioning and fixing wall 31. It is the structure which opposes the inner surface 37a of 37, and is in surface contact mutually. Furthermore, first and second engaging grooves 45a and 45b that can be engaged with the first and second positioning walls 35 and 36, respectively, are formed on both sides of the first positioning and fixing piece 41, and Each engagement groove 45a, 45b engages with each of the positioning walls 35, 36, thereby restricting the horizontal movement of the cover 13 together with the third positioning fixing piece 43 positioned diagonally thereto. The cover 13 can be positioned with respect to 12.

  Further, a locking projection 41b configured to be locked in a locking groove 37b of the fixed wall 37 is formed on the outer side surface 41a of the first positioning fixing piece 41 so as to protrude. Then, as shown in FIGS. 8 and 9, the locking projection 41b is fitted into the locking groove 37b and locked in the locking groove 37b, so that the third positioning fixing piece is positioned at the opposite corner. 43, the movement of the cover 13 in the vertical direction is restricted, whereby the cover 13 can be fixed (temporarily fixed) to the case 12.

  Here, the locking protrusion 41b is formed to have a substantially arc-shaped cross section, and a distance L3 from the center thereof to the lower surface 38a of the mounting portion 38 (hereinafter referred to as “an offset amount of the locking protrusion 41b”). .) Is smaller than a distance L4 from the center of the locking groove 37b to the mounting surface 26 in the fixed wall 37 (hereinafter referred to as “an offset amount of the locking groove 37b”), that is, the locking groove. It is set so that the relationship of “L3 <L4” is established with the offset amount L4 of 37b. In the state where the case 12 and the cover 13 are assembled, the mounting surface 26 of the case 12 and the mounting portion 38 of the cover 13 A predetermined gap L5 (L4-L3) is formed between the lower surface 38a). Further, the gap L5 is equal to or smaller than the gap L6 with the fixing protrusion 39 in the seal groove 27, that is, the relationship “L5 ≦ L6” is established with the gap L6. (See FIGS. 10 and 11). The locking protrusion 41b may be formed so as to have a substantially rectangular cross section together with the locking groove 37b, and has a shape capable of being engaged with the locking groove 37b. If so, the shape is not particularly limited.

  As shown in FIG. 8, the cover 13 enters the adhesive 30 in which the fixing protrusions 39 are previously filled in the seal groove 27, so that the adhesive 30 in the seal groove 27 is removed. A part of the adhesive 30 is filled between the mounting surface 26 of the case 12 and the lower surface 38a of the mounting portion 38 of the cover 13 in the vicinity of the seal groove 27 by being pushed into the gap L5. .

  Here, regarding the gap L5, the case where it is normally set in FIG. 10 and the case where it is set to the minimum in FIG. 11 are shown respectively. However, the gap L5 is not limited to the illustrated interval. As long as the adhesive 30 has an interval that allows the adhesive 30 to flow between the surface 26 and the lower surface 38a of the attachment portion 38 of the cover 13, the distance can be set arbitrarily within the range of “L5 ≦ L6”. . In addition, regarding the grounds for setting the upper limit value of the gap L5 to L6, when the gap L5 becomes larger than L6, a pressurizing action on the adhesive 30 described later cannot be sufficiently obtained, and the seal groove 27 and the fixing protrusion 39 and the adhesive 30 may not be sufficiently press-contacted, which may result in failure to ensure good adhesion between the case 12 and the cover 13.

  Further, as shown in FIG. 9, the first positioning and fixing piece 41 has an arcuate corner portion 41c formed by so-called chamfering outside the bent portion 41d on the base end side. With this configuration, when the cover 13 is assembled to the case 12, the arcuate corner portion 41 c slides down on the tapered surface 37 c of the fixed wall 37, so that the first positioning fixed piece provided on the opposite side thereof. 43, it is possible to perform so-called centering of the cover 13, which guides the horizontal position of the cover 13 toward the center side of the case 12. At this time, by providing the arc-shaped corner portion 41c outside the bent portion 41d, smooth contact between the bent portion 41d and the tapered surface 37c is obtained. Provided for smooth centering.

  Further, the first side corresponding to the engagement grooves 28b and 29b of the first and second brackets 28 and 29 is formed on the side portion of the mounting portion 38 adjacent to the first and second side walls 13b and 13c in the cover 13. The second engaging protrusions 46a and 46b are provided so as to protrude along the thickness width direction of the mounting portion 38, respectively. As a result, it is possible to prevent erroneous assembly of the cover 13 as described above.

  Further, as shown in FIGS. 1 and 3, the cover 13 has a substantially circular breathing hole 47 formed through the ceiling wall 13 a thereof. A breathing filter 48 is provided for adjusting the pressure difference between the inside and outside of the casing CS constituted by the cover 13 and the case 12. Note that a so-called dam wall 49 is provided at the outer peripheral edge of the breathing hole 47 over the entire circumference, so that the intrusion of water into the housing CS can be suppressed.

  Next, the assembly of the electronic control unit 10 configured as described above will be described. First, as shown in FIG. 3, the heat radiation sheets 24a and 24b are placed on the heat radiation bases 23a and 23b of the case 12, respectively. After the connector 15 is attached and fixed to the circuit board 11 with the screws 20, the circuit board 11 is fixed to the case 12 while the connection ports 16 to 18 of the connector 15 are inserted into the window portion 21. It mounts on the support surface 22a of the part 22, and it fixes to the case 12 with the screw outside a figure.

  Then, after filling the seal groove 27 of the case 12 to which the circuit board 11 is attached with the adhesive 30, the cover 13 is fitted on the case 12. Specifically, the direction of the cover 13 is adjusted so that the engagement protrusions 46 a and 46 b of the cover 13 can be engaged with the engagement grooves 28 b and 29 b of the case 12. The cover 13 is attached in such a manner that the four corners are aligned, that is, the lower end portions of the positioning fixing pieces 41 to 44 of the cover 13 are brought into contact with the upper end portions of the positioning fixing walls 31 to 34 of the case 12. It is placed on the case 12 from the part 38 side.

  Then, as shown by phantom lines in FIG. 9, the cover 13 slides down the arcuate corners 41 c of the positioning fixing pieces 41 to 44 on the tapered surfaces 37 c of the positioning fixing walls 31 to 34. By doing so, it is automatically guided to the center side of the case 12, and the cover 13 can be centered with respect to the case 12. Subsequently, when the centering is completed, the cover 13 is pushed downward to engage the positioning fixing pieces 41 to 44 and the positioning fixing walls 31 to 34 as indicated by solid lines in FIG. With the structure, the cover 13 is positioned with respect to the case 12 in the horizontal direction. As a result, the tip of the fixing protrusion 39 on the cover 13 side faces the vicinity of the center in the width direction of the seal groove 27.

  Then, by pushing the cover 13 further downward in this positioned state, as shown by phantom lines in FIG. 8, the locking projections 41b of the positioning fixing pieces 41 to 44 are moved to the positioning fixing walls. Each of the locking projections 41b slides on each of the inner side surfaces 37a in a state where the positioning fixing pieces 41 to 44 are elastically deformed inwardly by being pushed away by the inner side surfaces 37a of 31 to 34. When the positions of the respective locking grooves 37b are reached, as shown by solid lines in FIG. 8, the respective locking projections 41b are respectively brought into the respective locking grooves 37b with a restoring force based on the elastic deformation. Will be fitted and locked. Then, the vertical movement of the cover 13 with respect to the case 12 is restricted by the locking structure, and the cover 13 is fixed to the case 12.

  Here, in the present embodiment, since the cover 13 is made of resin, there is a possibility that so-called warpage deformation may occur at the time of molding. However, the mounting surface 26 of the case 12 and the lower surface 38a of the mounting portion 38 of the cover 13 By providing the gap L5 in between, even if the warp deformation occurs in the cover 13 and the attachment portion 38 of the cover 13 bulges downward, this can be absorbed by the gap L5, Thus, the locking and fixing by the locking grooves 37b and the locking projections 41b can be performed satisfactorily. In other words, if there is no gap L5, if the warping deformation has occurred in the cover 13, the mounting portion 38 of the cover 13 bulging downward as described above is the mounting surface of the case 12. However, in this embodiment, such inconvenience can be avoided.

  Further, as the cover 13 is pushed into the case 12, the fixing protrusion 39 of the cover 13 enters into the adhesive 30 in the seal groove 27, and the locking protrusions 41b. The fixing protrusions 39 are held in a state of being immersed in the adhesive 30 by being locked in the stop grooves 37b.

  At this time, in the present embodiment, because of the relationship of “L1 ≦ L2”, the fixing protrusion 39 enters the adhesive 30 in the seal groove 27 after the cover 13 is positioned. The fixing protrusion 39 enters substantially perpendicularly to the surface of the adhesive 30 (opening surface of the seal groove 27) in a state where the gap L6 is secured from the inner wall of the seal groove 27 by positioning the cover 13. Will be. Thus, when the fixing protrusion 39 enters the adhesive 30, the fixing protrusion 39 scratches the adhesive 30 and prevents the occurrence of problems.

  In the present embodiment, due to the relationship of “L3 <L4”, the predetermined gap L5 is provided between the attachment surface 26 of the case 12 and the lower surface 38a of the attachment portion 38 of the cover 13, and the gap L5. Is configured so as to satisfy the condition of “L5 ≦ L6”, a part of the adhesive 30 extruded by the fixing protrusion 39 entering the adhesive 30 is part of the gap L6. By being pushed into the relatively small gap L5, pressure acts on the adhesive 30 in the seal groove 27 (hereinafter referred to as “pressurizing action on the adhesive 30”). As a result, the adhesive 30 comes into pressure contact with the inner surface of the seal groove 27 and the outer surface of the fixing protrusion 39, and the adhesion between the sealing groove 27 and the fixing protrusion 39 and the adhesive 30 is enhanced. As a result, the familiarity of the adhesive 30 to the seal groove 27 and the fixing protrusion 39 is improved.

  Furthermore, since the clearance L5 is provided, the case 12 and the cover 13 can be locked and fixed satisfactorily (temporarily fixed) as described above. As a result, a good sealing property (waterproofness) by the adhesive 30 can be ensured.

  In this way, after the cover 13 is temporarily fixed to the case 12, the fixing protrusion 39 is held in the state where the fixing protrusion 39 enters the adhesive 30 with the locking structure. The adhesive 30 is cured, and the case 12 and the cover 13 are completely fixed. With this, the assembly of the electronic control device 10 is completed.

  As described above, according to the electronic control device 10 according to the present embodiment, at least a pair of the positioning fixing walls 31 to 34 is erected on the case 12, and the positioning fixing walls 31 to 34 are mounted on the cover 13. The positioning fixing pieces 41 to 44 that can be engaged with each other are provided so as to satisfy the condition of “L1 ≦ L2”. Since the strip 39 is made to enter the adhesive 30 in the seal groove 27, the fixing projection 39 is substantially straight with respect to the surface of the adhesive 30 (the opening surface of the seal groove 27) at an appropriate position in the width direction. Can enter. Accordingly, when the case 12 and the cover 13 are joined (assembled), when the fixing protrusion 39 enters the adhesive 30, the fixing protrusion 39 scrapes the adhesive 30 out. Is suppressed, and the device 10 can be easily and appropriately assembled.

  Further, in adopting the positioning structure, since the tapered surfaces 37c are provided inside the upper ends of the positioning fixing walls 31 to 34, the cover 13 is attached to the center of the case 12 by the tapered surfaces 37c. It is possible to guide to the side. Accordingly, the cover 13 can be easily positioned by the positioning fixing walls 31 to 34, and the assembly workability of the apparatus 10 can be improved.

  In addition, conventionally, the case 12 and the cover 13 are temporarily fixed using a plurality of screws. In this embodiment, the locking grooves are formed in at least a pair of the positioning fixing walls 31 to 34 of the case 12. 37b, and the positioning fixing pieces 41 to 44 of the cover 13 are provided with the locking protrusions 41b that can be locked to the locking grooves 37b, so that the cover 13 made of a resin material is provided. Since the case 12 and the cover 13 can be locked and fixed with a so-called snap-fit structure using elasticity, the temporary fixing of the both 12 and 13 can be easily performed. As a result, the assembly workability of the apparatus 10 can be further improved, and the use of a plurality of screws as in the prior art can contribute to weight reduction of the apparatus 10.

  Furthermore, by eliminating the conventional screw fixing, it is not necessary to process the screw hole particularly on the case 12 side, so that productivity can be improved and costs can be reduced by reducing the number of processing steps.

  In adopting the snap fit structure, in the present embodiment, due to the relationship of “L3 <L4”, a predetermined gap is provided between the mounting surface 26 of the case 12 and the lower surface 38a of the mounting portion 38 of the cover 13. Since L5 is provided and the gap L5 is configured to satisfy the condition of “L5 ≦ L6”, the gap generated when the fixing protrusion 39 enters the adhesive 30 in the seal groove 27 Due to the pressurizing action on the adhesive 30 by L5, the wettability of the adhesive 30 between the case 12 and the cover 13 can be improved. As a result, the case 12 and the cover 13 can be firmly bonded together, and a high sealing performance between the two 12 and 13 can be secured. As a result, the durability of the apparatus 10 is also improved.

  In the present embodiment, the case 12 that accommodates and fixes the circuit board 11 is formed of a metal material, and the cover 13 that is used to cover the circuit board 11 is formed of a resin material. Compared to the conventional case formed by the above, the weight of the casing CS is reduced, and the weight of the device 10 can be reduced. In adopting this configuration, the window portion 21 for exposing the connector 15 to the outside and the radiating bases 23a and 23b used for radiating heat of the electronic components 14a and 14b having high heat generation are highly rigid. Since it arrange | positions collectively in the case 12 which consists of a metal material excellent in heat dissipation, sufficient rigidity and heat dissipation as the apparatus 10 are securable.

  Although the breathing hole 47 used for pressure adjustment in the casing CS is provided in the cover 13 made of a resin material, the breathing hole 47 is an opening that is sufficiently smaller than the window portion 21 and the like. Therefore, there is no possibility that the rigidity of the cover 13 is extremely reduced. In addition, since moisture acts on the peripheral edge of the breathing hole 47, the breathing hole 47 is disposed not on the case 12 side made of a metal material but on the cover 13 side made of a resin material. There is no fear of 47 corrosion, and the durability of the apparatus 10 is further improved.

  Moreover, the cover 13 made of a resin material is not simply a lid shape, but a so-called box shape constituted by the ceiling wall 13a and the side walls 13b to 13e standing on the peripheral edge thereof. Thus, the rigidity of the cover 13 itself can be improved, and warpage deformation due to the heat effect of the cover 13 can be suppressed. Therefore, it can contribute to the further improvement of durability of apparatus 10 also from this viewpoint.

  The present invention is not limited to the configuration of the above-described embodiment. For example, both the case 12 and the cover 13 are made of a metal material, and the both 12 and 13 are temporarily fixed using a plurality of screws, as in the prior art. Even if it is performed, it is possible to obtain the positioning effect according to the embodiment.

  Further, even when one of the case 12 and the cover 13 is formed of a resin material as in the embodiment, for example, the circuit board 11 is attached and fixed to the cover 13, and the window portion 21 and each of the heat dissipations are attached to the cover 13. By providing the pedestals 23a and 23b, as shown in FIG. 12, the cover 13 may be formed of a metal material, and the case 12 may be formed of a resin material. In other words, as described above, when one of the case 12 and the cover 13 is formed of a resin material, the circuit board 11 provided with the window portion 21 and the radiating bases 23a and 23b is to be fixed. If the member is formed of a metal material, it does not matter whether it is the case 12 or the cover 13.

  In addition, the positioning fixing walls 31 to 34 are arranged at the four corners of the case 12 in the embodiment, but each of the positioning fixing walls 31 to 34 includes the first positioning fixing wall 31 and the first positioning wall 31. The three positioning fixing walls 33, the second positioning fixing wall 32, and the fourth positioning fixing wall 34, which face each other diagonally, function as a pair, and two pairs improve stability. However, the positioning action can be obtained with at least one pair. Therefore, it is not always necessary to provide at each corner, and can be freely changed according to, for example, the specifications of the electronic control device 10 and the specifications of the mounted automobile.

  Further, the pair of positioning fixing walls 31 to 34 are not necessarily provided at the corners of the case 12 as in the above-described embodiment. For example, as shown in FIGS. The fixing walls 31 to 34 may be provided on the side walls 12 b to 12 e of the case 12, and the pair of positioning fixing pieces 41 to 44 may be provided on the side walls 13 b to 13 e of the cover 13 in accordance with this. In other words, the locking means constituted by the positioning fixing walls 31 to 34 and the positioning fixing pieces 41 to 44 has the position of the electronic control device 10 or the specification of the mounted vehicle, etc. It is possible to change freely according to.

  Further, in the present embodiment, the radiation fins 23a and 23b are provided along the longitudinal direction of the bottom wall 12a, that is, along the short side direction of the radiation bases 23a and 23b. Thus, it is also possible to provide along the long side direction of each said heat radiation base 23a, 23b. In other words, the direction and size of each of the heat dissipating fins 25a and 25b is arbitrarily selected according to the specifications of the electronic control device 10 or the specifications of the mounted vehicle, such as the amount of heat generated by each of the electronic components 14a and 14b. However, the present invention is not limited to the configuration of the embodiment.

11 ... Circuit board 12 ... Case (first member)
13 ... Cover (second member)
26: Mounting surface (joint surface of the first member)
27 ... Seal groove 30 ... Adhesive (sealant)
31-34 ... 1st-4th positioning fixed wall (positioning means)
38a: The lower surface of the mounting portion (joint surface of the second member)
39 ... Fixing ridge (projection)
CS ... Case

Claims (3)

A first member having a seal groove on its joint surface;
A second member that has a protrusion that engages with the seal groove on the joint surface, and is assembled to the first member by engaging the protrusion with the seal groove;
A circuit board housed in a housing constituted by the first member and the second member;
A sealing material that fills the seal groove and seals between the joint surfaces of the first member and the second member in a liquid-tight manner by being interposed between the seal groove and the protrusion;
An electronic control device comprising: positioning means for positioning the first member and the second member before the protrusion contacts the sealing material. While one member of the first member or the second member is formed of a resin material,
The positioning means is a pair of positioning fixing walls that are erected on the outer edge of the joint surface of the other member that is not made of resin, and that each of the positioning means has a locking portion that can lock one of the resin members. Composed by
When the first member and the second member are assembled, the one member is engaged with the other member via the locking portion when the protrusion enters the predetermined depth position in the seal groove. The electronic control device according to claim 1, wherein the electronic control device is configured to be fixed. The electronic control device according to claim 2, wherein a taper surface that is inclined downward toward the inside of each positioning fixing wall is provided inside a tip end portion of each positioning fixing wall.

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