JP2016096599A - Housing for electronic control unit and electronic control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a housing for an electronic control unit, capable of reducing an amount of thermal expansion/contraction of a resin part at a bottom of a housing body without increasing the number of components; and an electronic control unit.SOLUTION: A housing 12 for an electronic control unit includes: a resin-made housing body 14 which is formed in a bottomed box shape and in which a bus bar is inserted at a bottom 23 thereof; and a metal-made heat sink 16 assembled to the housing body 14 so as to close a top surface opening. A deformation suppression means is provided between joining surfaces of a peripheral wall part 24 of the housing body 14 and a peripheral edge part of the heat sink 16, the deformation suppressing means comprising a projecting portion 51 and a recessed channel portion 40 which are fitted to each other so as to suppress the deformation of the peripheral wall part 24 of the housing body 14 in a plate thickness direction.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an electronic control device housing and an electronic control device that house electronic components in the electronic control device.

  As a conventional example of a housing for an electronic control device, for example, there is one described in Patent Document 1. The housing for an electronic control device of Patent Document 1 is a resin-made housing main body formed in a bottomed box shape and having a bus bar inserted at the bottom, and a metal heat sink assembled so as to be superimposed on the bottom surface of the housing main body. It has.

JP 2004-120328 A

  Generally, the difference in linear expansion is greatly different between resin and metal. For this reason, in the resin-made housing main body in which the bus bar is inserted in the bottom portion, stress is applied to the bus bar due to a difference in linear expansion between the resin portion and the bus bar (metal portion) as the resin portion in the bottom portion thermally expands and contracts. If the stress is large, the bus bar may be deformed. The stress applied to the bus bar becomes more prominent as the shape of the housing body increases. Further, if the bus bar is severely deformed, disconnection or the like may occur at the joint between the bus bar and the terminal of the electronic component. Moreover, in patent document 1, although the heat sink is provided, the heat sink is not utilized for suppression of the thermal expansion-contraction amount of the resin part of the bottom part of a housing main body.

  The problem to be solved by the present invention is to provide a housing for an electronic control device and an electronic control device capable of suppressing the amount of thermal expansion and contraction of the resin portion at the bottom of the housing body without increasing the number of components. .

  According to a first aspect of the present invention, there is provided a resin-made housing body formed in a bottomed box shape and having a bus bar inserted at the bottom, and a metal heat sink assembled so as to close the upper surface opening with respect to the housing body. A housing for an electronic control device, wherein a deformation in the thickness direction of the peripheral wall portion of the housing main body is suppressed between the joint surfaces of the peripheral wall portion of the housing main body and the peripheral edge portion of the heat sink. Deformation suppressing means comprising a convex portion and a concave portion that are fitted to each other is provided. According to this configuration, the thickness of the peripheral wall portion of the housing body is obtained by fitting the convex portion and the concave portion of the deformation suppressing means provided between the joint surfaces of the peripheral wall portion of the housing body and the peripheral portion of the heat sink. Directional deformation can be suppressed. Thereby, the thermal expansion-contraction amount of the resin part of the bottom part of a housing main body can be suppressed. For this reason, the stress concerning a bus bar can be relieved by the linear expansion difference of the resin part of the bottom part of a housing main body, and a bus bar (metal part). Further, by using a heat sink, it is not necessary to increase the number of parts.

  According to a second invention, in the first invention, a resin-made resin cover for covering the housing body is provided. According to this configuration, the resin cover covering the housing main body can suppress deformation of the peripheral wall portion of the housing main body outward in the plate thickness direction.

  According to a third invention, in the second invention, a metal metal cover for covering the resin cover is provided. According to this configuration, the metal cover that covers the resin cover can indirectly suppress deformation of the peripheral wall portion of the housing body outward in the plate thickness direction via the resin cover. In addition, since the metal cover serves as an electromagnetic shield, the electromagnetic wave resistance of the electronic component can be improved.

  According to a fourth invention, in the first invention, a metal metal cover for covering the housing body is provided. According to this configuration, the metal cover covering the housing main body can suppress deformation of the peripheral wall portion of the housing main body outward in the plate thickness direction. In addition, since the metal cover serves as an electromagnetic shield, the electromagnetic wave resistance of the electronic component can be improved.

  In a fifth aspect based on the third or fourth aspect, the metal cover is fixed to the heat sink. According to this configuration, the metal cover fixed to the heat sink can suppress deformation of the peripheral wall portion of the housing body outward in the plate thickness direction.

  According to a sixth invention, in any one of the first to fifth inventions, the convex portion and / or the concave portion of the deformation suppressing means is linearly extending continuously or intermittently in the circumferential direction over the entire circumference. Is formed. According to this configuration, the deformation in the plate thickness direction of the peripheral wall portion of the housing body can be suppressed as compared to the case where the convex portions and the concave portions of the deformation suppressing means are dispersedly arranged so as to be scattered in the circumferential direction.

  A seventh invention is an electronic control device including the electronic control device housing according to any one of the first to sixth inventions.

1 is a perspective view showing an electronic control device according to Embodiment 1. FIG. It is a perspective view which decomposes | disassembles and shows a housing. It is a top view which shows a housing main body. It is a bottom view which shows a heat sink. It is a top view which shows a housing cover. It is sectional drawing which shows the fastening part of the heat sink with respect to a housing main body. It is sectional drawing which shows a deformation | transformation suppression means. It is sectional drawing which shows the engaging part of the housing cover with respect to a housing main body. It is sectional drawing which shows the principal part concerning Embodiment 2. FIG. It is sectional drawing which shows the principal part concerning Embodiment 3.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1] Embodiment 1 will be described. The electronic control device of this embodiment is a fuel pump controller that drives and controls a fuel pump that supplies fuel to an internal combustion engine (engine) mounted on a vehicle such as an automobile. The fuel pump controller is installed in the trunk room of the vehicle. The fuel pump controller is connected to a fuel pump provided in the fuel tank and an engine control device (ECU) that comprehensively controls the internal combustion engine. Thereby, a fuel pump controller controls the electric power supplied to a fuel pump based on the control signal from an engine control apparatus (ECU). FIG. 1 is a perspective view showing an electronic control unit. For convenience of explanation, each direction is determined as indicated by an arrow based on the perspective view of FIG. 1, but it does not specify the arrangement direction of the electronic control unit.

  As shown in FIG. 1, the electronic control device 10 includes a long rectangular box-shaped housing 12. A plurality of electronic components related to the fuel pump controller are accommodated in the housing 12. The housing 12 includes a housing main body 14, a heat sink 16, and a housing cover 18. 2 is an exploded perspective view showing the housing, FIG. 3 is a plan view showing the housing body, FIG. 4 is a bottom view showing the heat sink, and FIG. 5 is a plan view showing the housing cover. In FIG. 2 and FIG. 3, electronic components are omitted. For convenience of explanation, the housing main body 14, the heat sink 16, and the housing cover 18 will be described in order, and then the assembly procedure thereof will be described.

  The housing body 14 will be described. As shown in FIG. 3, the housing body 14 is made of resin, and a plurality of bus bars 22 are inserted therein. The resin part which makes the main body of the housing main body 14 is formed in the bottomed long rectangular box shape which opens an upper surface (refer FIG. 2). The resin part has a bottom part 23 and a peripheral wall part 24. The bottom 23 is formed in a long rectangular flat plate shape. The peripheral wall portion 24 is formed in a rectangular tube shape that rises on the peripheral edge portion of the bottom portion 23, and includes a front wall portion 26, a rear wall portion 27, a left wall portion 28, and a right wall portion 29. The rear wall portion 27 is formed with a left connector portion 31 and a right connector portion 32 that protrude rearward. Although not shown, the left connector portion 31 is connected to an external connector of wiring for the fuel pump. The right connector portion 32 is connected to an external connector having wiring for an engine control unit (ECU).

  The plurality of bus bars 22 are made of metal, and are embedded or inserted into the bottom 23 of the housing body 14. Among the plurality of bus bars 22, the plurality of bus bars 22 arranged at the rear portion of the housing body 14 have a connection terminal portion 34 extending rearward via the rear wall portion 27. For example, the left four connection terminal portions 34 are exposed in the left connector portion 31. Further, the three right side connection terminal portions 34 are exposed in the right connector portion 32.

  The plurality of bus bars 22 are connected to each other via a tie bar portion at the time of insert molding of the housing main body 14, and are electrically independent by removing the tie bar portion after the insert molding. Further, the plurality of bus bars 22 may be individually arranged at the time of insert molding of the housing body 14. The bottom 23 is formed with a large number of opening holes that expose the connection portions of the bus bar 22 to the terminals of the electronic component. An electronic circuit is configured by joining terminals of electronic components to the bus bar 22 by welding or the like using the opening holes. Examples of the electronic component include a capacitor, a coil, and an IC.

  A plurality of (for example, two) cylindrical metal collars 36 are embedded in the bottom 23 of the housing body 14 together with the bus bar 22 by insert molding. The collar 36 is disposed at the left front portion and the right rear portion of the bottom portion 23.

  At the upper end of the peripheral wall portion 24 of the housing main body 14, a flange portion 38 that protrudes outward is formed over the entire circumference (see FIG. 2). Thereby, the thickness of the upper end part of the surrounding wall part 24 is thickened. On the upper end surface including the flange portion 38 of the peripheral wall portion 24, a linear concave groove portion 40 extending continuously over the entire circumference is formed. In the peripheral wall portion 24, the front and rear two cutout missing portions 42 are formed symmetrically on the flange portion 38 in the left wall portion 28 and the right wall portion 29. For this reason, the groove part 40 is formed in the linear form extended intermittently in the circumferential direction. Engaging claws 44 are formed in the center part of the missing part 42 in the front-rear direction. The upper surface of the engaging claw 44 is disposed on the same surface as the groove bottom surface of the recessed groove portion 40 or below the groove bottom surface. The upper end surface of the peripheral wall portion 24 corresponds to a “joint surface” in this specification. Further, the concave groove portion 40 corresponds to a “concave portion” in this specification.

  The heat sink 16 will be described. As shown in FIG. 2, the heat sink 16 is made of a metal such as aluminum, and is formed in a rectangular plate shape that closes the upper surface opening of the housing body 14. At the front part of the heat sink 16, a horizontally elongated drooping portion 46 protruding downward is formed (see FIG. 4). The hanging portion 46 is disposed at a position corresponding to an electronic component with a large amount of heat generation among electronic components (not shown) disposed in the housing body 14, and abuts in surface contact with the upper surface of the electronic component. It is made possible.

  As shown in FIG. 4, a plurality of (for example, two) cylindrical fastening boss portions 48 projecting from the lower surface are formed on the lower surface of the heat sink 16. The fastening boss portion 48 is disposed at a position corresponding to the collar 36 of the housing body 14. A screw hole 49 is formed in the lower surface of the fastening boss portion 48. Further, the front fastening boss portion 48 is disposed adjacent to the hanging portion 46.

  On the lower surface of the peripheral edge portion of the heat sink 16, a protruding ridge portion 51 that extends continuously over the entire circumference is formed. The protruding portion 51 is disposed slightly inside the outer end of the lower surface of the heat sink 16. The ridge 51 is formed so as to be able to fit into the groove 40 (see FIG. 3) of the peripheral wall 24 of the housing body 14. The lower surface of the peripheral portion of the heat sink 16 corresponds to a “joint surface” in the present specification. Further, the ridge 51 corresponds to the “convex” in this specification.

  The housing cover 18 will be described. As shown in FIG. 5, the housing cover 18 is made of resin and is formed in a bottomed rectangular box shape having an open top surface (see FIG. 2). The housing cover 18 includes a bottom plate portion 53 and a peripheral frame portion 54. The bottom plate portion 53 is formed in a rectangular flat plate shape. The peripheral frame portion 54 is formed in a rectangular tube shape that rises on the peripheral edge portion of the bottom plate portion 53, and includes a front plate portion 56, a rear plate portion 57, a left plate portion 58, and a right plate portion 59. The rear plate portion 57 is formed with a U-shaped receiving groove portion 61 that can receive both connector portions of the housing body 14 from above (see FIG. 2).

  As shown in FIG. 2, two front and rear engagement pieces 63 are formed on the left plate portion 58 and the right plate portion 59 in a symmetrical manner. In the left plate portion 58 and the right plate portion 59, a pair of U-shaped groove-like cut grooves 64 adjacent to the front and rear of the engagement piece 63 are formed. Thereby, the engagement piece 63 is formed so as to be elastically deformed in the plate thickness direction (left-right direction), so-called bending deformation. A square hole-like engagement hole 65 is formed at the upper end of the engagement piece 63. The engagement hole 65 is formed to be engageable with the engagement claw 44 of the housing body 14 through elastic deformation of the engagement piece 63. The housing cover 18 corresponds to a “resin cover” in this specification.

  A procedure for assembling the housing main body 14, the heat sink 16, and the housing cover 18 will be described. It is assumed that necessary electronic components are mounted on the housing body 14 in advance. 6 is a cross-sectional view showing a fastening portion of the heat sink with respect to the housing body, FIG. 7 is a cross-sectional view showing the deformation suppressing means, and FIG. In the state shown in FIG. 2, the heat sink 16 is placed on the upper surface of the housing body 14 so as to overlap from above. Thereby, the upper surface opening part of the housing main body 14 is closed by the heat sink 16 (refer FIG.6 and FIG.8).

  At this time, the protrusion 51 of the heat sink 16 is fitted into the groove 40 of the peripheral wall 24 of the housing body 14 (see FIG. 7). Further, the lower surface of the peripheral portion of the heat sink 16 (specifically, the lower surface adjacent to the inner peripheral side and the outer peripheral side of the ridge 51) is brought into contact with the upper surface of the peripheral wall portion 24 of the housing body 14. In addition, the “deformation restricting means” referred to in the present specification is constituted by the recessed groove portion 40 and the protruding strip portion 51.

  Further, the lower end surface of the fastening boss portion 48 of the heat sink 16 is brought into concentric contact with the upper end surface of the collar 36 of the bottom portion 23 of the housing body 14 (see FIG. 6). In this state, a headed mounting screw 67 is fastened to the screw hole 49 of the heat sink 16 from below the housing body 14 through the hollow portion of the collar 36. The same applies to the fastening part including the remaining fastening boss part 48 and the collar 36. As described above, the heat sink 16 is assembled to the housing body 14 by fastening.

  Further, as shown in FIG. 8, the lower end surface of the hanging portion 46 of the heat sink 16 is brought into contact with the upper surface of a heat generating electronic component, for example, a package 69a of an IC 69. The heat sink 16 radiates heat generated by the IC 69. Note that the terminal 70 of the IC 69 is joined to the bus bar 22 by welding or the like.

  Next, the housing body 14 to which the heat sink 16 is assembled is fitted into the housing cover 18 from above (see FIGS. 6 and 8). Accordingly, each engagement piece 63 of the housing cover 18 is bent and deformed outward (see the two-dot chain line 63 in FIG. 8) while interfering with the engagement claw 44 of the housing body 14. Finally, at the same time as the engagement hole 65 is aligned with the engagement claw 44, the engagement piece 63 is elastically restored. Thereby, the engagement hole 65 engages with the engagement claw 44 (see the solid line 63 in FIG. 8). The same applies to the fastening portions between the remaining engaging claws 44 and the engaging holes 65 (see FIG. 1). As described above, the housing cover 18 is assembled to the housing body 14 by engagement, that is, snap fit.

  Accordingly, the connector portions 31 and 32 of the housing body 14 are received in the receiving groove 61 (see FIG. 2) of the housing cover 18 (see FIG. 1). As shown in FIGS. 6 and 8, the inner peripheral surface of the peripheral frame portion 54 of the housing cover 18 is in contact with the outer peripheral surface of the peripheral wall portion 24 of the housing body 14. Further, the peripheral edge portion of the bottom plate portion 53 of the housing cover 18 is brought into contact with the lower end surface of the peripheral wall portion 24 of the housing main body 14. As described above, the housing body 14 is covered with the housing cover 18.

  According to the electronic control device housing 12 described above, the protrusion 51 and the groove 40 of the deformation suppressing means provided between the joint surfaces of the peripheral wall 24 of the housing body 14 and the peripheral edge of the heat sink 16 are fitted. As a result, deformation in the thickness direction of the peripheral wall portion 24 of the housing body 14 can be suppressed. Thereby, the thermal expansion-contraction amount of the resin part of the bottom part 23 of the housing main body 14 can be suppressed. For this reason, the stress concerning the bus-bar 22 can be relieved by the linear expansion difference of the resin part of the bottom part 23 of the housing main body 14, and the bus-bar 22 (metal part). Further, by using the heat sink 16, it is not necessary to increase the number of parts.

  Further, the housing cover (resin cover) 18 that covers the housing body 14 can suppress deformation of the peripheral wall portion 24 of the housing body 14 outward in the plate thickness direction.

  Further, the protrusion 51 of the deformation suppressing means is formed in a linear shape extending continuously over the entire circumference, and the concave groove portion 40 is formed in a linear shape extending intermittently in the circumferential direction. . Therefore, the deformation in the plate thickness direction of the peripheral wall portion 24 of the housing body 14 can be suppressed as compared with the case where the convex portions and the concave portions of the deformation suppressing means are dispersedly arranged so as to be scattered in the circumferential direction.

  A front fastening boss portion 48 is disposed adjacent to the hanging portion 46. That is, the fastening portion by the mounting screw 67 between the housing main body 14 and the heat sink 16 is disposed at a position adjacent to the IC 69 with which the hanging portion 46 of the heat sink 16 contacts. Therefore, since the amount of displacement due to thermal expansion and contraction of the resin portion of the bottom 23 of the housing body 14 in the vicinity of the fastening portion is small, the stress applied to the joint portion between the bus bar 22 adjacent to the fastening portion and the terminal 70 of the IC 69 can be relieved. it can.

  Further, it is possible to provide the electronic control device 10 including the housing 12 that can suppress the amount of thermal expansion and contraction of the resin portion of the bottom portion 23 of the housing main body 14 without increasing the number of parts.

[Embodiment 2] Embodiment 2 will be described. Since the present embodiment is a modification of the first embodiment, the changed portion will be described and redundant description will be omitted. FIG. 9 is a cross-sectional view showing the main part. In the present embodiment, as shown in FIG. 9, the housing cover 18 in the first embodiment (see FIG. 8) is changed to a metal housing cover 72. Further, the engagement claw 44 of the housing body 14 in the first embodiment is omitted. For this reason, the missing portion 42 (see FIG. 2) of the flange portion 38 is omitted, and the concave groove portion 40 is continuously extended over the entire circumference by continuously forming the flange portion 38 over the entire circumference. Can be made.

  The housing cover 72 is formed in a bottomed long rectangular box shape having an upper surface opened, and includes a bottom plate portion 73 and a peripheral frame portion 74. The bottom plate portion 73 is in contact with the bottom portion 23 (specifically, the outer peripheral portion) of the housing main body 14. The peripheral frame portion 74 is in contact with the outer peripheral surface of the peripheral wall portion 24 (specifically, the flange portion 38) of the housing body 14. At the upper end of the peripheral frame portion 74, a plurality of bent pieces 76 (one is shown in FIG. 9) bent at right angles or substantially right angles inward are formed. The bent piece 76 is disposed so as to overlap the upper surface of the peripheral edge of the heat sink 16. A screw insertion hole 77 is formed in the bent piece 76. Further, a screw hole 79 corresponding to the screw insertion hole 77 is formed in the heat sink 16. A fixing screw 81 with a head is fastened from above the heat sink 16 to a screw hole 79 of the heat sink 16 through a screw insertion hole 77 of the bent piece 76. The housing cover 72 corresponds to a “metal cover” in the present specification.

  According to the present embodiment, the housing cover 72 as a metal cover covering the housing body 14 can suppress deformation of the peripheral wall portion 24 of the housing body 14 outward in the plate thickness direction. Moreover, since the housing cover 72 serves as an electromagnetic shield, the electromagnetic wave resistance of the electronic component can be improved.

  Further, the housing cover 72 fixed to the heat sink 16 by the fixing screw 81 can suppress the deformation of the peripheral wall portion 24 of the housing body 14 outward in the plate thickness direction.

  The bent piece 76 may be formed for each plate portion of the peripheral frame portion 74. In this case, it is preferable to form at least one screw insertion hole 77 in each bent piece 76. Further, the bent piece 76 may be formed continuously over the entire circumference of the peripheral frame portion 74. In this case, it is preferable to form at least two screw insertion holes 77 in the bent piece 76 in a dispersed manner.

[Embodiment 3] Embodiment 3 will be described. Since the present embodiment is a modification of the first embodiment, the changed portion will be described and redundant description will be omitted. FIG. 10 is a cross-sectional view showing the main part. In this embodiment, as shown in FIG. 10, the housing cover 72 in the second embodiment is applied as a metal cover that covers the housing cover (resin cover) 18 in the first embodiment. Regarding the housing cover 72, the same parts as those in the second embodiment are denoted by the same reference numerals. Further, the bottom plate portion 73 is in contact with the bottom plate portion 53 (specifically, the outer peripheral portion) of the housing cover 18. The peripheral frame portion 74 is in contact with the outer peripheral surface of the peripheral frame portion 54 of the housing cover 18.

  According to the present embodiment, the housing cover 72 as a metal cover covering the housing cover (resin cover) 18 indirectly deforms the peripheral wall portion 24 of the housing body 14 outward in the plate thickness direction via the housing cover 72. Can be suppressed.

[Other Embodiments]
The present invention is not limited to the embodiments, and can be modified without departing from the gist of the present invention. For example, the present invention may be applied to a housing of an electronic control device other than the fuel pump controller. Further, the convex portion of the deformation suppressing means may be disposed on the housing body 14 and the concave portion may be disposed on the heat sink 16. Moreover, you may form a convex part in the linear form extended intermittently in the circumferential direction. Moreover, you may form a recessed part in the linear form extended continuously over the perimeter.

10. Electronic control unit 12 ... Housing (housing for electronic control unit)
14 ... Housing body 16 ... Heat sink 18 ... Housing cover (resin cover)
22 ... Bus bar 23 ... Bottom 24 ... Peripheral wall 40 ... Concave groove (depression of deformation suppressing means)
51 ... ridge (projection of deformation suppressing means)
72. Housing cover (metal cover)

Claims (7)

A resin-made housing body formed in a bottomed box shape and having a bus bar inserted in the bottom,
A housing for an electronic control device, comprising: a metal heat sink assembled so as to close an upper surface opening with respect to the housing body,
A deformation composed of a convex portion and a concave portion that are fitted to each other so as to suppress deformation in the thickness direction of the peripheral wall portion of the housing main body between the joint surfaces of the peripheral wall portion of the housing main body and the peripheral edge portion of the heat sink. A housing for an electronic control device provided with a suppression means. The electronic control device housing according to claim 1,
A housing for an electronic control device comprising a resin cover made of resin that covers the housing body. The electronic control device housing according to claim 2,
A housing for an electronic control device, comprising a metallic metal cover that covers the resin cover. The electronic control device housing according to claim 1,
A housing for an electronic control device, comprising a metallic metal cover that covers the housing body. A housing for an electronic control device according to claim 3 or 4,
The metal cover is a housing for an electronic control device fixed to the heat sink. A housing for an electronic control device according to any one of claims 1 to 5,
The convex portion and / or the concave portion of the deformation suppressing means is a housing for an electronic control device formed in a linear shape extending continuously or intermittently in the circumferential direction over the entire circumference. The electronic control apparatus provided with the housing for electronic control apparatuses as described in any one of Claims 1-6.

Images