JP2019067626A - Electronic equipment - Google Patents

Abstract

To reduce a stress generated at a connection part between a connector and a bus bar unit when an external force acts on the connector.SOLUTION: An electronic control unit 100 comprises: a heat radiation base 11; a power substrate 13 fixed to the heat radiation base 11; a bus bar unit 15 electrically connected with the power substrate 13; and a connector 14 connected with a mating terminal of a mating connector, and electrically connected with the bus bar unit 15. The connector 14 has a projection 191 not contacted with the heat radiation base 11 when no external force acts, and contacted with the heat radiation base 11 when an external force acts.SELECTED DRAWING: Figure 11

Description

  The present invention relates to an electronic device.

  An automobile is equipped with a large number of ECUs (Electronic Control Units) for controlling an electric power steering device, an engine, a drive system and the like. The ECU, which is an electronic device, is provided with a connector on which a connector (a mating connector) such as a power supply cable or a control signal cable is attached (see Patent Document 1).

  Patent Document 1 describes that a DC conductor module having a power connector and a control module having a signal connector are screwed to a metal casing. The DC conductor module is connected to the circuit board via a power lead frame (bus bar), and the control module is connected to the circuit board via a signal lead frame (bus bar).

JP, 2010-63242, A

  When inserting and removing the mating connector into the connector, a predetermined external force acts on the connector. Therefore, when an external force is applied, the connector is deformed, and stress is concentrated on the connection portion between the connection terminal of the connector and the bus bar connected to the circuit board, and the connection portion may be damaged.

  The present invention has been made in view of the above problems, and an object of the present invention is to reduce stress generated in a connection portion between a connector and a bus bar unit when an external force acts on the connector.

  A first invention relates to an electronic device, which is connected to a circuit board fixed to a base, a bus bar unit electrically connected to the circuit board, and a mating terminal of a mating connector and electrically connected to the bus bar unit The connector is characterized in that the connector is in noncontact with the base when no external force is applied, and has a restricting portion that contacts the base when the external force is applied.

  In the first aspect of the invention, when the connector and the bus bar unit are electrically connected by preventing the restricting portion of the connector from coming into contact with the base when an external force for inserting and removing the mating connector does not act on the connector. In addition, the restriction portion of the connector does not interfere with the alignment between the connector and the bus bar unit. When an external force is applied to the connector such as inserting and removing the mating connector, the restricting portion of the connector contacts the base, thereby reducing the stress applied to the connecting portion of the connector and the bus bar unit and suppressing damage to the connecting portion it can.

  In the second invention, the connector has a connection terminal connected to the mating terminal and a plurality of fixing portions fixed to the base, and the bus bar unit has one end connected to the circuit board and the other end connected to the connection terminal And a bus bar holding member for holding the bus bar, wherein the base is a mounting surface on which the circuit board is mounted, and a positioning surface which defines the position of the connector by contacting the fixing portion And.

  In the second aspect of the invention, positioning of the connector is performed by the fixing portion abutting on the positioning surface. That is, the connector is attached in the direction orthogonal to the positioning surface of the base. Thus, when an external force is applied to the connector in a direction different from the direction of attaching the connector to the base when inserting or removing the mating connector into the connector, the deformation of the connector can be effectively restricted by the regulating portion. .

  The third invention is characterized in that the positioning surface is set at a position higher than the mounting surface.

  In the third invention, since the position of the point of application of the external force acting on the connector and the position of the fixed fulcrum of the connector can be brought close to each other, the amount of bending of the connector can be suppressed more effectively.

  In a fourth aspect of the invention, the connector has a terminal holding portion for holding the connection terminal, and the base has a stepped surface located closer to the bottom surface of the base than the peripheral region of the mounting surface, and the restricting portion is a terminal The protrusion is a protrusion which protrudes from the bottom surface of the holding portion toward the step surface, and covers a gap between the peripheral region of the mounting surface and the terminal holding portion.

  In the fourth invention, the restricting portion covers the gap between the peripheral area of the mounting surface and the terminal holding portion, so that the appearance can be improved, and foreign matter such as dust and water droplets intrude inside the electronic device. Can be suppressed.

  In a fifth aspect of the invention, the connector has a terminal holding portion for holding the connection terminal, the base has a projection that protrudes from the peripheral region of the mounting surface, and the restricting portion is provided on the bottom surface of the terminal holding portion. The projection is a recess into which the projection is inserted, and the projection covers the gap between the peripheral area of the mounting surface and the terminal holding portion.

  In the fifth invention, since the projection covers the gap between the peripheral area of the mounting surface and the terminal holding portion, the appearance can be improved, and foreign substances such as dust and water droplets intrude inside the electronic device. Can be suppressed.

  A sixth invention is characterized in that the connection terminal includes a bus bar connection portion connected to the bus bar, and the bus bar connection portion includes a bent portion.

  In the sixth invention, the path length of the bus bar connecting portion can be increased by providing the bent portion in the bus bar connecting portion. Thereby, the influence which the external force which arises on a connector gives to the connection part of a connection terminal and a bus-bar can be suppressed, and the stress which generate | occur | produces in this connection part can be reduced.

  In a seventh aspect of the present invention, the restricting portion restricts the deformation of the connector in the first direction, and the second restricting portion restricts the deformation of the connector in the second direction opposite to the first direction. And.

  In the seventh invention, when attaching or detaching the mating connector to the connector, it is possible to restrict the bending of the connector due to the external force from various directions generated in the connector.

  According to the present invention, when an external force acts on the connector, it is possible to reduce the stress generated in the connection portion between the connector and the bus bar unit.

It is an exploded perspective view showing the electronic equipment concerning a 1st embodiment of the present invention. It is a perspective view which shows the assembly with which the power board | substrate, the bus-bar unit, and the connector were assembled | attached to the thermal radiation base. It is a perspective view of a connector. It is a perspective view of the connector seen from the direction different from Drawing 3A. It is a perspective view of a heat dissipation base. It is a perspective view of the thermal radiation base to which the power substrate was attached. It is a perspective view of the thermal radiation base in which the bus bar unit was attached to the power substrate. It is a top view of the thermal radiation base and connector to which the power substrate was attached, and shows the state before a connector is fixed to a thermal radiation base. It is a perspective view of the thermal radiation base in the state where the connector was positioned. It is a top view of the thermal radiation base to which the power substrate was attached, and shows the state after the connector was fixed to the thermal radiation base. It is an expanded sectional view which follows the XX line of FIG. 9, and shows the connection structure of the fixing | fixed part of a connector, and the reinforcement of the support | pillar of a base. It is an expanded sectional view which follows the XI-XI line of FIG. The electronic device which concerns on 1st Embodiment of this invention WHEREIN: It is a schematic diagram explaining the control of a deformation | transformation of the 1st direction of a connector. The electronic device which concerns on 2nd Embodiment of this invention WHEREIN: It is a schematic diagram explaining the control of a deformation | transformation of a 2nd direction of a connector. It is an exploded perspective view of the electronic equipment concerning the modification of a 2nd embodiment of the present invention. It is a schematic diagram which shows the shape of the connecting terminal of the connector used for the electronic device which concerns on 3rd Embodiment of this invention, and the positional relationship of a connecting terminal and a 1st positioning protrusion. It is a schematic diagram which shows the shape of the connection terminal of the connector used for the electronic device which concerns on the modification of 3rd Embodiment of this invention, and the positional relationship of a connection terminal and a 1st positioning protrusion. It is a cross-sectional schematic diagram which shows the control part of the connector used for the electronic device which concerns on this modification 1. FIG.

First Embodiment
Hereinafter, an electronic device according to a first embodiment of the present invention will be described with reference to the drawings. Note that for convenience of explanation, a coordinate system including an x axis, a y axis, and a z axis is set as illustrated, and the z axis direction is described as the vertical direction of the electronic device. The x-axis, y-axis and z-axis are orthogonal to one another.

  Hereinafter, the case where the electronic device is the electronic control unit (ECU) 100 of the electric power steering apparatus will be described. The electric power steering apparatus assists the driver's steering of the vehicle by controlling a motor for assisting the driver's steering force based on the steering torque of the steering wheel and the vehicle speed. The electronic control unit 100 controls the drive of the motor based on information output from a torque sensor, a vehicle speed sensor, or the like.

  As shown in FIG. 1, the electronic control unit 100 includes a rectangular parallelepiped heat dissipating base 11, a power board 13 and a control board 16 as circuit boards fixed to the heat dissipating base 11, and a bus bar unit fixed to the power board 13. 15, a connector 14 electrically connected to the power substrate 13 via the bus bar unit 15, and a rectangular box-shaped cover 12 covering various components attached to the heat dissipation base 11.

  The heat dissipation base 11 is a heat sink that constitutes the bottom of the electronic control unit 100, and is formed of a metal material such as aluminum or an aluminum alloy. The heat dissipating base 11 is a flat plate portion 111 in a rectangular flat plate shape, a column 112 provided at four corners of the flat portion 111, and a pair of first positioning protrusions which project upward from the flat portion 111 and define the position of the power substrate 13. 113 and a second positioning protrusion 114.

  At a central portion of the flat plate portion 111, a rectangular mounting surface 111a on which the power substrate 13 is mounted is formed. The back surface of the power substrate 13 abuts on the mounting surface 111 a.

  The power substrate 13 is a circuit substrate responsible for driving a motor (not shown), and a bridge circuit including power semiconductor elements (not shown) such as MOSFETs and IGBTs is mounted. The power substrate 13 is a metal substrate formed of a metal material such as aluminum or an aluminum alloy.

  The control board 16 is mounted with a microcomputer for controlling a bridge circuit and the like mounted on the power board 13 and peripheral circuit elements, and is electrically connected to the power board 13. The control board 16 has a rectangular flat shape, and is disposed above the power board 13. The control substrate 16 is a glass epoxy based substrate.

  The power substrate 13 is disposed directly on the mounting surface 111 a of the flat plate portion 111 of the heat dissipation base 11 or via a flexible heat dissipation sheet or the like, and is fixed to the flat plate portion 111 by a screw. The control board 16 is supported by the four columns 112 and fixed to the tip of the column 112 by screws. By arranging the power substrate 13 having a larger amount of heat generation than the control substrate 16 on the mounting surface 111 a, the power substrate 13 can be cooled effectively. Further, by supporting the control board 16 by the support column 112, the control board 16 can be disposed at a predetermined distance from the power board 13 which is likely to generate heat. Therefore, the influence of the heat from the power board 13 on the control board 16 Can be reduced.

  Furthermore, the power substrate 13 and the control substrate 16 are arranged to overlap in the z-axis direction, which is the extending direction of the column 112. Thus, the dimensions of the electronic control unit 100 in the x direction and the y direction can be reduced as compared to the case where the power substrate 13 and the control substrate 16 are arranged side by side on the flat plate portion 111.

  As shown in FIG. 2, the bus bar unit 15 is mounted on the power substrate 13. The bus bar unit 15 includes a bus bar 151 having one end electrically connected to the power substrate 13 and the other end electrically connected to a connection terminal 141 of the connector 14 described later, and a bus bar holding member 152 for holding the bus bar 151 Have.

  The bus bar holding member 152 is formed of a non-conductive resin material or the like, and is disposed along the surface of the power substrate 13, that is, along the xy plane. The plurality of bus bars 151 are integrally molded on the bus bar holding member 152, whereby the bus bar unit 15 is formed.

  The bus bar holding member 152 has a beam 153 extending along the y axis, and a pair of pillars 154 provided at both ends of the beam 153 and extending along the z axis, and has a portal shape. The lower ends of the pair of columns 154 are inserted into the pair of holes provided in the power substrate 13. The pair of columns 154 is inserted into the holes of the power substrate 13 to temporarily fix the bus bar unit 15 to the power substrate 13.

  At the central portion in the longitudinal direction of the beam 153, a positioning pin 155 to be inserted into the positioning hole of the power substrate 13 is formed.

  The bus bar 151 is formed of a conductive metal material such as copper or nickel. The bus bar 151 is formed by bending a strip-like conductive plate. The bus bar 151 extends along the x-axis and is supported by the bus-bar holding member 152, and a terminal joint 151b extending upward along the z-axis from an end of the base 151a on the connector 14 side. A vertical portion 151c extending downward along the z-axis from an end opposite to the connector 14 in the base portion 151a, and a substrate bonding portion 151d extending along the x-axis from the lower end of the vertical portion 151c; Have.

  The terminal bonding portion 151 b has a contact surface that makes surface contact with the bus bar bonding portion 146 b of the connection terminal 141 of the connector 14 described later. The contact surface of the terminal bonding portion 151b in surface contact with the bus bar bonding portion 146b is formed to be parallel to the yz plane.

  The substrate bonding portion 151 d is bonded to a conductive land (not shown) disposed on the power substrate 13 by soldering.

  As shown in FIG. 1, the cover 12 has a rectangular flat plate-like top plate 121 and four side plates 122 extending downward from four sides of the top plate 121. Of the four side plates 122, a rectangular opening 122b to which the connector 14 is attached is formed in one side plate 122A disposed parallel to the yz plane.

  The connector 14 is connected to a mating connector (not shown) of a cable that connects an external device (not shown) and the electronic control unit 100. In the present embodiment, the connector 14 is used to output the current from the plurality of bus bars 151 to a motor (not shown) provided outside the electronic control unit 100.

  As shown in FIGS. 3A and 3B, the connector 14 includes a connection terminal 141 to which the other terminal of the other connector (not shown) is connected, a terminal holding portion 142 for holding the connection terminal 141, and the other connector (not shown). And a pair of fixing portions 140 fixed to the heat dissipation base 11. In addition, three or more fixing parts 140 may be provided.

  The connection terminal 141 is formed of a conductive metal material such as copper or nickel. The connection terminal 141 is formed by bending a strip-like conductive plate. The connection terminal 141 is a base 145 (see FIGS. 9 and 11) embedded in the terminal holding portion 142, a bus bar connection plate 146 exposed from the terminal holding portion 142 and extending toward the bus bar unit 15, and a terminal And an external conducting portion 147 (see FIGS. 9 and 11) exposed from the holding portion 142 and extending toward the side opposite to the bus bar unit 15.

  The base portion 145 and the external conducting portion 147 are formed in a rectangular plate shape extending along the x-axis. The bus bar connecting plate 146 has a horizontal portion 146a extending along the x axis from the end of the base portion 145, and a bus bar joint 146b extending upward along the z axis from the end of the horizontal portion 146a. Form an L-shape in side view. That is, between the horizontal part 146a and the bus bar joint part 146b is a bent part 146c bent 90 degrees. The bus bar joint portion 146 b has a contact surface that makes surface contact with the terminal joint portion 151 b of the bus bar 151 described above. The contact surface of the bus bar joint 146 b in surface contact with the terminal joint 151 b is formed to be parallel to the yz plane.

  The bus bar joint portion 146 b is joined to the terminal joint portion 151 b by welding. In the present embodiment, by providing the bent portion 146c in the bus bar connection plate 146, the path length of the bus bar connection plate 146 can be made longer as compared with the case where the bent portion is not provided. As a result, it is possible to suppress the influence exerted by the external force generated in the connector 14 on the connection portion between the connection terminal 141 and the bus bar 151, and to reduce the stress generated in the connection portion.

  The terminal holding portion 142 is formed of a non-conductive resin material or the like, and is formed in a substantially rectangular parallelepiped shape in which the y-axis direction is a longitudinal direction. The mounting portion 143 has a recess into which the mating connector is fitted, and an external conducting portion 147 (see FIGS. 9 and 11) to which the mating terminal of the mating connector is electrically connected is disposed inside.

  The terminal holding portion 142 includes a pair of belt-like flat plates 190A and 190B facing each other, a pair of connecting plates 148 connecting both ends of the pair of belt-like flat plates 190A and 190B in the y-axis direction, and a pair of connecting plates 148 The plurality of reinforcing plates 149 connecting the strip-like flat plates 190A and 190B to each other and the plurality of embedded portions 144 in which the base portion 145 of the connection terminal 141 is embedded.

  As shown in FIG. 1, one belt-like flat plate 190 </ b> A of the pair of belt-like flat plates 190 </ b> A and 190 </ b> B is a decorative board covering the opening 122 b of the cover 12. The connector 14 is fixed to the heat dissipation base 11 by a screw 195. The details of the positioning structure and fixing structure of the connector 14 with respect to the heat dissipation base 11 will be described later.

  As shown in FIG. 4, the mounting surface 111 a is formed at a position slightly higher than the peripheral region 111 b around the mounting surface 111 a. The mounting surface 111a and the peripheral region 111b may be formed flush with each other.

  The flat plate portion 111 is provided with a pair of first positioning protrusions 113 and a single second positioning protrusion 114 protruding upward from the peripheral region 111b. The pair of first positioning protrusions 113 is in the shape of a rectangular flat plate, and is disposed along one side of the mounting surface 111 a extending along the y axis. The single second positioning projection 114 is in the form of a rectangular flat plate, and is disposed along one side extending along the x-axis of the mounting surface 111a.

  As shown in FIG. 5, the power substrate 13 is mounted on the mounting surface 111 a and fixed to the heat dissipation base 11 by screws. One side surface of the power substrate 13 extending along the y-axis is formed as a first reference surface 131. One side surface of the power substrate 13 extending along the x-axis is formed as a second reference surface 132.

  As shown in FIGS. 4 and 5, the first positioning protrusion 113 has an x-axis inner contact surface 113 a that contacts the first reference surface 131 of the power substrate 13. The x-axis inner contact surface 113 a and the first reference surface 131 are flat surfaces parallel to the yz plane. The pair of first positioning protrusions 113 abuts on the first reference surface 131 of the power substrate 13 to define the position of the power substrate 13 with respect to the heat dissipation base 11 in the x-axis direction. When the x-axis direction is defined based on the power substrate 13, the x-axis direction is a direction orthogonal to the first reference surface 131 of the power substrate 13.

  The second positioning projection 114 has a y-axis inner abutment surface 114 a that abuts on the second reference surface 132 of the power substrate 13. The y-axis inner contact surface 114 a and the second reference surface 132 are flat surfaces parallel to the xz plane. The single second positioning protrusion 114 abuts on the second reference surface 132 of the power substrate 13 to define the position of the power substrate 13 with respect to the heat dissipation base 11 in the y-axis direction. When the y-axis direction is defined based on the power substrate 13, the y-axis direction is a direction orthogonal to the second reference surface 132 of the power substrate 13, that is, a direction parallel to the first reference surface 131 of the power substrate 13.

  An example of the procedure for attaching the power substrate 13 to the heat dissipation base 11 is as follows. The first reference surface 131 of the power substrate 13 is brought into contact with each of the x-axis inner contact surfaces 113 a of the pair of first positioning protrusions 113. Next, the power substrate 13 is slid in the y-axis direction while maintaining the first reference surface 131 in contact with the first positioning projection 113. The power substrate 13 is slid until the second reference surface 132 abuts on the y-axis inner contact surface 114 a of the second positioning projection 114. Finally, by fixing the power substrate 13 to the flat plate portion 111 with a screw, the attachment of the power substrate 13 to the heat dissipation base 11 is completed.

  As described above, by arranging the power substrate 13 such that the first reference surface 131 abuts on the pair of first positioning protrusions 113, positioning of the power substrate 13 with respect to the heat dissipation base 11 in the x-axis direction can be performed easily and accurately. be able to. Furthermore, by arranging the power substrate 13 so that the second reference surface 132 abuts on the second positioning projection 114, the positioning of the power substrate 13 with respect to the heat dissipation base 11 in the y-axis direction can be performed easily and accurately.

  As shown in FIG. 6, the bus bar unit 15 is fixed to the power substrate 13. An example of the procedure for attaching the bus bar unit 15 to the power substrate 13 is as follows. The positioning pins 155 of the bus bar unit 15 are fitted into the positioning holes of the power substrate 13, and the pair of pillars 154 are inserted into the pair of holes provided in the power substrate 13. Next, after the bus bar unit 15 is installed on the power substrate 13, the substrate bonding portion 151 d of the bus bar 151 is soldered to the land of the power substrate 13, and the substrate bonding portion 151 d is bonded to the power substrate 13.

  The positioning structure and fixing structure of the connector 14 with respect to the heat dissipation base 11 will be described in detail below with reference to FIGS. 3A, 3B, and 7 to 10.

  As shown in FIGS. 3A and 3B, the terminal holding portion 142 of the connector 14 is provided with a pair of L-shaped convex portions 180A and 180B that exhibit an L shape when the connecting plate 148 is viewed from the z-axis direction. . The L-shaped convex portion 180A protruding from one of the pair of connecting plates 148 is a first flat surface 181 which is a flat surface parallel to the yz plane and a second flat surface 182 which is a flat surface parallel to the xz plane. And. The L-shaped convex portion 180B protruding from the other of the pair of connecting plates 148 is a first flat surface 181 which is a flat surface parallel to the yz plane and a second flat surface 182 which is a flat surface parallel to the xz plane. And.

  As shown in FIGS. 7 and 9, the first flat surface 181 of the L-shaped convex portions 180A and 180B abuts on the first reference surface 131 of the power substrate 13. The power substrate 13 abuts on the first flat surface 181 to define the position of the connector 14 with respect to the heat dissipation base 11 in the x-axis direction. When the x-axis direction is defined based on the connector 14, the x-axis direction is a direction orthogonal to the first plane 181 of the connector 14.

  One of the pair of first positioning protrusions 113 of the heat dissipating base 11 described above (the first positioning protrusion 113 on the right side in the figure) abuts on the second flat surface 182 of the L-shaped convex portion 180A of the connector 14 It has a contact surface 113b. The y-axis outer contact surface 113 b is a flat surface parallel to the xz plane. The first positioning projection 113 abuts on the second flat surface 182 of the L-shaped convex portion 180A of the connector 14 to thereby define the position of the connector 14 with respect to the heat dissipation base 11 in the y-axis direction. When the y-axis direction is defined based on the connector 14, the y-axis direction is a direction orthogonal to the second plane 182 of the connector 14, that is, a direction parallel to the first plane 181 of the connector 14. In the present embodiment, the L-shaped convex portion 180B of the connector 14 has the same shape as the L-shaped convex portion 180A and has the second flat surface 182, but the pair of first positioning protrusions 113 It does not abut on the other (the first positioning projection 113 on the left side in the figure).

  The first positioning projection 113 on the right side of the drawing has a function of defining the position of the connector 14 in the y-axis direction with respect to the heat dissipating base 11 in addition to the function of defining the position of the power substrate 13 with respect to the heat dissipating base 11 in the x-axis direction. Therefore, compared to the case where the member for defining the position of the power substrate 13 in the x-axis direction with respect to the heat dissipating base 11 and the member for defining the position of the connector 14 in the y-axis direction with respect to the heat dissipating base 11 are provided separately The manufacturing cost of the control unit 100 can be reduced.

  As shown in FIGS. 9 and 10, the connector 14 is placed on the reinforcing portion 112 a of the support 112 of the heat dissipation base 11 and fixed to the reinforcing portion 112 a by the screw 195. The reinforcing portion 112 a is a protruding portion that protrudes from the column main body in the x-axis direction at the proximal end portion of the support column 112. The upper surface of the reinforcing portion 112 a is a flat surface parallel to the xy plane, and is a positioning surface 112 b that defines the position of the connector 14 in the z-axis direction with respect to the heat dissipation base 11 by abutting on the fixing portion 140 of the connector 14. . That is, the connector 14 is attached in a direction (z-axis direction) orthogonal to the positioning surface 112 b of the heat dissipation base 11.

  The base end side of the reinforcing portion 112 a is continuous with the flat plate portion 111, and has a function of suppressing deformation of the support column 112 and the heat dissipating base 11. Furthermore, the reinforcing portion 112 a also has a function as a mounting table that defines the position of the connector 14 in the z-axis direction with respect to the heat dissipation base 11 by mounting the connector 14. Therefore, the manufacturing cost of the electronic control unit 100 can be reduced as compared with the case where the reinforcing portion 112 a and the mounting table are provided separately.

  The fixing portion 140 of the connector 14 is fixed to the reinforcing portion 112 a of the support 112 by the screw 195. As shown in FIGS. 7 and 9, the fixing portion 140 is provided so as to protrude outward in the y-axis direction from the pair of connecting plates 148 of the terminal holding portion 142.

  As shown in FIGS. 7, 8 and 10, the fixing portion 140 is provided with a through hole penetrating in the z-axis direction, and a metal collar 140a is inserted into the through hole. The collar 140a is formed in a cylindrical shape and is fixed so as not to cause displacement in the through hole. The collar 140a is fixed to the through hole, for example, by insert molding. In this case, it is preferable to provide a recess or a protrusion on the outer peripheral surface of the collar 140a so that the collar 140a is not displaced in the through hole.

  As shown in FIG. 10, both ends of the collar 140 a protrude from the fixing portion 140. The lower end surface of the collar 140 a abuts on the upper surface (the positioning surface 112 b) of the reinforcing portion 112 a of the support column 112. The shaft portion of the screw 195 is inserted into the inside of the collar 140a. At the tip of the screw 195, a male screw portion is formed to be screwed to a female screw portion formed on the inner peripheral surface of the screw hole 112c of the reinforcing portion 112a. The screw holes 112 c may not penetrate the heat dissipation base 11 as shown in the drawing, or may penetrate the heat dissipation base 11.

  An example of the procedure for attaching the connector 14 to the heat dissipation base 11 is as follows. As shown in FIG. 8, the pair of fixing portions 140 of the connector 14 is mounted on the reinforcing portion 112 a of the column 112 which is a mounting table.

  As shown in FIG. 9, the first flat surface 181 of the L-shaped convex portions 180A and 180B is brought into contact with the first reference surface 131 of the power substrate 13 fixed to the heat dissipation base 11. Next, the connector 14 is slid in the y-axis direction while maintaining the L-shaped convex portions 180A and 180B in contact with the first reference surface 131. The connector 14 is slid until the second flat surface 182 of the L-shaped convex portion 180A abuts on the y-axis outer side contact surface 113b of the first positioning projection 113 disposed on the right side of the drawing. When the L-shaped convex portion 180A is in contact with the first positioning projection 113 disposed on the right side in the drawing, the distance between the first positioning projection 113 and the L-shaped convex portion 180B disposed on the left side in the drawing A gap is formed.

  Finally, as shown in FIG. 10, the screw 195 is passed through the inside of the collar 140a, and the male screw formed at the tip of the screw 195 is screwed into the female screw of the screw hole 112c of the reinforcing portion 112a. When the connector 14 is fixed to the reinforcing portion 112 a by the screw 195, the attachment of the connector 14 to the heat dissipation base 11 is completed.

  As shown in FIG. 11, after connector 14 is fixed to heat dissipation base 11, terminal junction 151b of bus bar 151 and busbar junction 146b of connection terminal 141 are brought into surface contact with each other to make terminal junction 151b and busbar junction. Join with 146b by welding. The welding method can employ various methods such as TIG welding, laser welding, electron beam welding, and the like. Further, instead of welding, the bus bar 151 and the connection terminal 141 may be joined by another joining method such as adhesion with conductive adhesive or pressure bonding.

  By mounting the metal collar 140 a on the reinforcing portion 112 a as a metal mounting table, positioning of the connector 14 with respect to the heat dissipation base 11 in the z-axis direction can be performed easily and accurately. Thus, the positioning accuracy of the relative position in the z-axis direction between the bus bar joint 146 b of the connection terminal 141 and the terminal joint 151 b of the bus bar 151 can be improved. As a result, the front end surface (upper end surface) of the bus bar joint portion 146 b and the front end surface (upper end surface) of the terminal joint portion 151 b can be set substantially flush. Thereby, the welding workability between the end of the bus bar joint 146b and the end of the terminal joint 151b can be improved.

  By arranging the connector 14 so that the first flat surface 181 of the connector 14 abuts on the first reference surface 131 of the power substrate 13, positioning of the relative position between the power substrate 13 and the connector 14 in the x-axis direction is easy and accurate It can be done well. Since the positioning accuracy of the relative position between the bus bar joint 146b of the connection terminal 141 and the terminal joint 151b of the bus bar 151 can be improved, the occurrence of welding defects at the weld 170 between the connection terminal 141 and the bus bar 151 can be reduced. can do.

  By arranging the connector 14 so that the second flat surface 182 of the connector 14 abuts on the y-axis outer side contact surface 113b of the first positioning projection 113, positioning of the connector 14 relative to the heat dissipation base 11 in the y-axis direction is easy and accurate. It can be done well.

  As described above, the power substrate 13 is positioned in the y-axis direction with respect to the heat dissipation base 11 by the second positioning protrusion 114. Therefore, by positioning the connector 14 in the y-axis direction with respect to the heat dissipation base 11, the relative position between the power substrate 13 and the connector 14 in the y-axis direction can be determined. Thus, the positioning accuracy of the relative position in the y-axis direction between the bus bar joint 146 b of the connection terminal 141 and the terminal joint 151 b of the bus bar 151 can be improved. As a result, it is possible to prevent the distance in the y-axis direction between the predetermined connection terminal 141 and the bus bar 151 disposed adjacent to the bus bar 151 joined to the predetermined connection terminal 141 from being reduced. Thereby, since the insulation distance between the conductive members can be secured, the highly reliable electronic control unit 100 can be provided.

  In this embodiment, the screw 195 for fixing the connector 14 to the heat dissipation base 11, the screw for fixing the power substrate 13 to the heat dissipation base 11, and the screw for fixing the control substrate 16 to the heat dissipation base 11 are all z. Arranged parallel to the axis. For this reason, the worker only needs to attach a screw from the upper side of the heat dissipation base 11, so that the workability is good. When the electronic control unit 100 is manufactured by a work machine instead of the worker, the electronic control unit 100 can be completed only by access from above in the manufacturing line. Thereby, the manufacturing efficiency can be improved, and the manufacturing cost of the electronic control unit 100 can be reduced.

  Next, when inserting and removing a mating connector (not shown) in the connector 14, a configuration for reducing stress generated in the welded portion 170 between the terminal joint portion 151 b and the bus bar joint portion 146 b will be described.

  As shown in FIGS. 3A and 3B, the lower end portion of the belt-like flat plate (decorative plate) 190A is a projecting portion 191 that protrudes below the bottom surfaces of the connection plate 148 and the reinforcing plate 149. The protrusion 191 extends from one connecting plate 148 to the other connecting plate 148.

  As shown in FIGS. 4 and 7, a step is formed at the corner on the upper end side in the thickness direction (z-axis direction) of the flat plate portion 111 of the heat dissipation base 11. The upper surface of the step (hereinafter referred to as the step surface 111c) is located closer to the bottom surface of the flat portion 111 of the heat dissipation base 11 than the mounting surface 111a and the peripheral region 111b of the power substrate 13.

  As shown in FIG. 11, in the state where the connector 14 is attached to the heat dissipating base 11, the protrusion 191 of the connector 14 and the step surface 111 c of the heat dissipating base 11 are disposed to face each other in the z-axis direction. As described above, the position of the connector 14 in the z-axis direction with respect to the heat dissipation base 11 is defined by the reinforcing portion 112 a of the support 112 and the collar 140 a of the fixing portion 140. For this reason, a gap 199 in the z-axis direction is formed between the peripheral edge region 111 b of the flat plate portion 111 and the bottom surface of the terminal holding portion 142. The projecting portion 191 protrudes from the bottom surface of the terminal holding portion 142 toward the step surface 111 c and covers the gap 199 between the peripheral region 111 b of the flat plate portion 111 and the bottom surface of the terminal holding portion 142.

  Since the gap 199 between the peripheral area 111b of the flat plate portion 111 and the bottom surface of the terminal holding portion 142 is configured so as not to be visible from the outside by the protruding portion 191, the appearance can be improved. In addition, by covering the gap 199 with the projecting portion 191, it is possible to suppress foreign matter such as dust and water droplets from invading the inside of the electronic control unit 100.

  The protruding portion 191 has a function as a restricting portion which restricts the deformation of the connector 14 and reduces the stress generated in the welded portion 170, in addition to the function of improving the appearance. As described above, the position of the connector 14 in the z-axis direction with respect to the heat dissipation base 11 is defined by the reinforcing portion 112 a of the support 112 and the collar 140 a of the fixing portion 140. Therefore, a predetermined gap 198 is formed between the protrusion 191 and the step surface 111c.

  The dimension D1 of the gap 198 is set to a value as small as possible within the range in which the tolerance can be absorbed, in order to suppress the amount of bending (the amount of deformation) of the connector 14 which is deformed due to the external force acting on the connector 14. For example, as shown in FIG. 12, when pulling out the mating connector from the connector 14, an external force F 11 that pulls the connector 14 toward the outside of the electronic control unit 100 or an external force F 12 that pushes the connector 14 downwards is When it acts, a rotational moment M1 acts on the connector 14 with the boundary portion between the fixing portion 140 and the reinforcing portion 112a in the shaft portion of the screw 195 as a fixing fulcrum P. As a result, the connector 14 bends (deforms) counterclockwise in the drawing.

  When the connector 14 bends, the protrusion 191 contacts the step surface 111c (D1 = 0), and the deformation of the connector 14 is restricted so that the amount of bending of the connector 14 is not further increased.

  Thus, the protrusion 191 is not in contact with the step surface 111c when no external force is applied to the connector 14, and contacts the step surface 111c when external forces F11 and F12 are applied to the connector 14 Regulate the deflection of 14 When the projecting portion 191 contacts the step surface 111c, the contact area between the connector 14 and the heat dissipation base 11 temporarily increases. Thereby, when external force F11 or external force F12 acts on connector 14, it is possible to reduce the stress generated in welded portion 170 between connection terminal 141 of connector 14 and bus bar 151.

  In addition, even when a resilient force that causes the connector 14 to rotate in the direction (x-axis direction) of inserting and removing the mating connector acts on the connector 14, the projecting portion 191 abuts on the step surface 111 c, and the connector 14 bends. It is regulated so that the amount does not increase further. For this reason, it is possible to reduce the stress generated in the welded portion 170 between the connection terminal 141 of the connector 14 and the bus bar 151 when the connector 14 is subjected to a strain.

  Since the connector 14 is attached to the opening 122a of the side plate 122A of the cover 12, the point of force of the external force generated when attaching the mating connector (not shown) to the connector 14 is located above the flat plate portion 111. Become. As the distance between the fixed fulcrum P and the force point in the z-axis direction is shorter, the rotational moment M1 is smaller, and the amount of deflection (the amount of deformation) of the connector 14 is suppressed. Therefore, in the present embodiment, the positioning surface 112b of the heat dissipating base 11 on which the fixing portion 140 is mounted is set at a position higher than the mounting surface 111a by a predetermined height. As a result, the amount of bending of the connector 14 generated when the mating connector (not shown) is inserted into and removed from the connector 14 as compared to the case where the positioning surface 112 b of the heat dissipation base 11 is set to the same height as the mounting surface 111 a Can be made smaller.

  Further, as the positioning surface 112b on which the fixing portion 140 is mounted is made higher from the mounting surface 111a, the engagement margin of the screw 195 can be made longer, and the connection strength and stability of the connector 14 to the heat dissipation base 11 can be improved. Can be

  In the present embodiment, in addition to the function of restricting the bending of the connector 14, the projection 191 is between the peripheral area 111 b of the mounting surface 111 a on which the power substrate 13 is mounted and the terminal holder 142 of the connector 14. Has a function of covering the gap 199 of Therefore, it is not necessary to provide a dedicated part having only the function of covering the gap 199 between the peripheral area 111b of the mounting surface 111a and the terminal holding part 142 separately from the restricting part. Therefore, the manufacturing cost of the electronic control unit 100 can be reduced.

  According to the above-described first embodiment, the following effects can be obtained.

  (1) The terminal holding portion 142 has a first flat surface 181 in direct contact with the first reference surface 131 of the power substrate 13. The first reference surface 131 is parallel to the contact surface of the bus bar 151 in contact with the connection terminal 141. It is formed to be Therefore, by arranging the connector 14 so that the first flat surface 181 of the connector 14 abuts on the first reference surface 131 of the power substrate 13, positioning of the relative position between the power substrate 13 and the connector 14 in the x-axis direction can be achieved. It can be done easily and accurately. That is, the relative position between the bus bar 151 connected to the power substrate 13 and the connection terminal 141 of the connector 14 can be easily and accurately positioned. Since the positioning accuracy of the connection terminal 141 and the bus bar 151 can be improved, the occurrence of welding defects can be reduced when welding the connection terminal 141 and the bus bar 151. Further, since positioning can be easily performed with high accuracy, the number of manufacturing steps of the electronic control unit 100 can be reduced, and the manufacturing cost can be reduced.

  (2) A projecting portion as a restricting portion that restricts the bending (deformation) of the connector 14 by contacting the heat dissipation base 11 when an external force acts on the connector 14 by inserting and removing the mating connector in the connector 14 191 is provided. Therefore, when an external force is applied to the connector 14, the bending (deformation) of the connector 14 is restricted by the protrusion 191. Thereby, when an external force acts on the connector 14, it is possible to reduce the stress generated in the welded portion 170 which is a connection portion between the connection terminal 141 of the connector 14 and the bus bar 151. When no external force is applied to the connector 14 for inserting and removing the mating connector, the protrusion 191 does not contact the heat dissipation base 11. Therefore, when positioning the connector 14 with respect to the bus bar unit 15, the protrusion 191 does not disturb the positioning operation. That is, the protrusion 191 as the restricting portion does not interfere with the alignment between the connector 14 and the bus bar unit 15.

Second Embodiment
An electronic control unit 100 according to a second embodiment of the present invention will be described with reference to FIG. In the following description, differences from the first embodiment are mainly described, and in the figure, the same reference numerals are given to the same or corresponding components as the components described in the first embodiment, and the description is omitted. .

  In the first embodiment, as shown in FIG. 12, when an external force F11 or an external force F12 acts on the connector 14, a projection 191 which restricts the connector 14 from being deformed in the first direction in the counterclockwise direction shown in the drawing. Has been described. On the other hand, in the connector 214 according to the second embodiment, as shown in FIG. 13, in addition to the projecting portion 191 which regulates the deformation of the connector 214 in the first direction, the illustration opposite to the first direction is shown. A restricting portion 291 is provided which restricts the deformation of the connector 214 in the clockwise second direction.

  In the second embodiment, the terminal holding portion 242 is formed longer in the x-axis direction than the terminal holding portion 142 of the first embodiment, and the lower end portion of the strip-like flat plate 190B is configured as the restricting portion 291.

  The protrusion 191 is provided at a predetermined distance away from the fixed fulcrum P in the x-axis direction on one side (left in the figure), and the restricting part 291 is predetermined on the other in the x-axis direction (right in the figure) It is provided at a distance.

  A predetermined gap 298 is formed between the restricting portion 291 and the peripheral region 111b. The dimension D2 of the gap 298 is set as small as possible within the range in which the tolerance can be absorbed, in order to suppress the amount of bending (the amount of deformation) of the connector 214 that is deformed due to the external force acting on the connector 214. For example, when an external force F21 which pushes the connector 214 toward the inside of the electronic control unit 100 when inserting the mating connector into the connector 214 or an external force F22 which pushes the connector 214 upward acts, as shown in FIG. A rotational moment M2 acts on the connector 214. As a result, the connector 214 bends (deforms) clockwise in the figure.

  The restriction portion 291 of the strip-like flat plate 190B is disposed to face the peripheral region 111b. The restricting portion 291 is not in contact with the peripheral area 111b when no external force is applied to the connector 214, and contacts the peripheral area 111b when external forces F21 and F22 are applied to the connector 214, thereby bending the connector 214. regulate. When the restricting portion 291 contacts the peripheral region 111b (D2 = 0), the contact area between the connector 214 and the heat dissipation base 11 temporarily increases. Thereby, when external force F21 or external force F22 acts on connector 214, it is possible to reduce the stress generated in welded portion 170 which is a connection portion between connection terminal 141 of connector 214 and bus bar 151.

  According to the second embodiment, in addition to the effects of the first embodiment, even when the external force F21 or the external force F22 acts on the connector 214, it is possible to suppress the bending of the connector 214. That is, according to the second embodiment, when attaching or detaching the mating connector to / from the mounting portion 143, it is possible to restrict the bending of the connector 214 caused by the external force from various directions generated in the connector 214. Thereby, the stress generated in the welding portion 170 which is a connection portion between the connection terminal 141 of the connector 214 and the bus bar 151 can be more effectively reduced.

Modification of Second Embodiment
Although the example which comprises the lower end part of the strip | belt-shaped flat plate 190B as the control part 291 was demonstrated in the said 2nd Embodiment, this invention is not limited to this. The upper end portion of the belt-like flat plate 190A may be configured as the restricting portion 391. As shown in FIG. 14, the pair of columns 322 aligned in the y-axis direction is provided with protrusions 322 b protruding inward in the y-axis direction. A restricting portion 391 of a strip-like flat plate 190A which is a decorative plate of the connector 314 is disposed to face the projecting portion 322b. The restricting portion 391 is not in contact with the projecting portion 322b when no external force is applied to the connector 314, and contacts the projecting portion 322b when external forces F21 and F22 are applied to the connector 314, thereby bending the connector 314. regulate.

  According to such a configuration, as in the second embodiment, even when any of the external forces F11, F12, F21, and F22 acts on the connector 314, bending of the connector 314 is suppressed, and connection of the connector 314 is established. It is possible to reduce the stress generated in the welding portion 170 which is a connection portion between the terminal 141 and the bus bar 151.

Third Embodiment
An electronic control unit 100 according to a third embodiment of the present invention will be described with reference to FIG. In the following description, differences from the first embodiment are mainly described, and in the figure, the same reference numerals are given to the same or corresponding components as the components described in the first embodiment, and the description is omitted. .

  As shown in FIG. 15, the bus bar connecting plate 446 of the connection terminal 441 of the connector 414 has three bent portions 441a, 441b and 441c. The bus bar connection plate 446 has a step-like shape in a side view.

  The bus bar connecting plate 446 includes a first extending portion 446a extending from the terminal holding portion 142, a second extending portion 446b extending from a tip end of the first extending portion 446a, and a second extending portion 446b. A third extending portion 446c extending from the tip end and a bus bar joint portion 146b extending from the tip end of the third extending portion 446c.

  The first extending portion 446 a is provided parallel to the xy plane, and extends from the terminal holding portion 142 toward the first positioning protrusion 113. The second extending portion 446 b is formed by bending the tip end portion of the first extending portion 446 a 90 degrees as the bending portion 441 a. The second extending portion 446 b is provided in parallel to the yz plane, and extends upward from the tip end of the first extending portion 446 a, that is, in a direction away from the flat plate portion 111. The third extending portion 446c is formed by bending the tip end portion of the second extending portion 446b by 90 degrees as the bending portion 441b.

  The third extending portion 446 c is provided in parallel to the xy plane, and extends from the tip of the second extending portion 446 b toward the terminal bonding portion 151 b of the bus bar 151. The bus bar joint portion 146 b is formed by bending the tip end portion of the third extending portion 446 c as a bending portion 441 c by 90 degrees. The bus bar joint portion 146 b is provided parallel to the yz plane, and extends upward from the tip end of the third extending portion 446 c, that is, in the direction away from the flat plate portion 111. The tip of the bus bar joint 146 b is joined to the terminal joint 151 b of the bus bar 151.

  The third extending portion 446 c is disposed to pass immediately above the first positioning protrusion 113. That is, by setting the bending portion 441a, which is the boundary between the first extending portion 446a and the second extending portion 446b, between the first positioning projection 113 and the mounting portion 143, the connection terminal 441 and the first positioning projection can be obtained. Interference with 113 is avoided.

  Thus, in the third embodiment, the bus bar connection plate 446 is provided with a greater number of bent portions than in the first embodiment. The path length of the bus bar connecting plate 446 from the terminal holding portion 142 to the bus bar 151 can be made longer than the path length of the bus bar connecting plate 146 of the first embodiment. It can be absorbed. Therefore, when an external force is generated in connector 414, it is possible to suppress the influence of the bending of connector 414 on weld 170 which is the connection portion between bus bar connection plate 446 and bus bar 151. As a result, it is possible to further reduce the stress generated in weld portion 170 which is a connection portion between bus bar connection plate 446 and bus bar 151.

  Further, in the third embodiment, by providing the bent portions of the bus bar connecting plate 446 at three locations, the path length of the bus bar connecting plate 446 can be increased while reducing the dimension in the x-axis direction of the electronic control unit 100. . Furthermore, in the third embodiment, since the bus bar connection plate 446 and the first positioning projection 113 can be arranged to overlap each other when viewed from the z-axis direction, the electronic control unit 100 in the y-axis direction The dimensions can be reduced. That is, according to the third embodiment, the degree of freedom in the arrangement of the connection terminals 441 can be improved.

<Modification of Third Embodiment>
In the third embodiment, the bus bar connecting plate 446 having a step-like side view is described, but the present invention is not limited to this. For example, as shown in FIG. 16, the bus bar connection plate 546 of the connection terminal 541 of the connector 514 may be provided with a U-shaped folded portion in a side view. The bus bar connecting plate 546 is bent by 90 degrees from the end of the first extending portion 546a extending from the terminal holding portion 142 toward the first positioning projection 113 and the end of the first extending portion 546a, and extends upward. It bends 180 degrees from the end of the existing second extending portion 546b and the second extending portion 546b, extends downward, further bends 90 degrees, and extends toward the terminal junction 151b of the bus bar 151. The third extending portion 546c and the bus bar joint portion 146b bent 90 degrees from the end of the third extending portion 546c and extending upward are provided.

  The third extending portion 546 c of the connection terminal 541 is disposed to pass immediately above the first positioning protrusion 113. According to such a configuration, the same effects as those of the third embodiment can be obtained.

  The following modifications are also within the scope of the present invention, and the configuration shown in the modification and the configuration described in the above embodiment may be combined, the configurations described in the different embodiments above may be combined, or the following differences It is also possible to combine the configurations described in the modification.

(Modification 1)
In the first embodiment, when the external force F11 or F12 acts on the connector 14, the protrusion 191 contacts the step surface 111c to limit the bending of the connector 14, but the present invention is not limited thereto. It is not limited. For example, the first embodiment can be modified as follows.

  FIG. 17 is a schematic cross-sectional view showing the restricting portion of the connector 14 used in the electronic device according to the first modification. In the first modification, a protrusion 111 d protruding upward from the peripheral region 111 b is provided in the peripheral region 111 b of the mounting surface 111 a of the heat dissipation base 11. The bottom surface of the terminal holding portion 142 of the connector 14 is provided with a recess 691 into which the protrusion 111 d is inserted. The protrusion 111 d is provided to extend in the y-axis direction between the pair of columns 112 disposed on the connector 14 side. The recess 691 extends in the y-axis direction from one connecting plate 148 to the other connecting plate 148. The protrusion 111 d covers the gap 199 between the peripheral region 111 b of the flat plate portion 111 and the bottom surface of the terminal holding portion 142.

  As shown in FIG. 17, in the first modification, the recess 691 functions as a restricting portion that restricts the deformation of the connector 14 in the first direction in the counterclockwise direction in the drawing. That is, when the external forces F11 and F12 act on the connector 14, the bottom surface of the recess 691 contacts the tip of the protrusion 111d, whereby the bending of the connector 14 is restricted. According to such a first modification, the same operation and effect as those of the first embodiment can be obtained.

(Modification 2)
In the above embodiment, the electronic control unit 100 used as an electronic control unit (ECU) of the electric power steering apparatus has been described as an example, but the present invention is not limited to this. The present invention can be applied to electronic devices used as various on-vehicle ECUs in automobile engine control devices, brake control devices, suspension control devices and the like.

(Modification 3)
Although the said embodiment supports the example which the base which supports a circuit board is formed as the thermal radiation base 11, this invention is not limited to this. The present invention can also be applied to an electronic device in which a circuit board is supported on a support base that does not have a heat dissipation function.

(Modification 4)
Although the said embodiment demonstrated the example in which the rectangular box-like cover 12 was attached to the thermal radiation base 11 which has four support | pillars 112, this invention is not limited to this. For example, instead of the cover 12, a rectangular flat lid member may be provided, the heat dissipation base may be formed into a rectangular box shape, and the lid member may be attached to the opening of the heat dissipation base. In this case, the connector 14 is attached to the opening provided in the side wall of the heat dissipation base.

(Modification 5)
In the first and second embodiments, an example in which the bus bar connection plate 146 has one bending portion is described, and in the third embodiment, an example in which the bus bar connection plate 446 has three bending portions is described. Moreover, although the modification of 3rd Embodiment demonstrated the example which the bus-bar connecting plate 546 has a bending part of four places, this invention is not limited to these. The number of bent portions of the bus bar connection plate may be two or five or more.

(Modification 6)
Although the said embodiment demonstrated the example which performs positioning of z axial direction of the connector 14 with respect to the thermal radiation base 11 by mounting the metal collar 140a in the reinforcement part 112a of the support | pillar 112, this invention limits to this I will not. The color 140a may be omitted. In this case, in order to prevent the resin parts constituting the connector from being warped or shrunk due to heat, a metal reinforcing member is provided, or the resin parts are formed of a resin material which is not easily thermally deformed. Is preferred. Furthermore, when attaching the screw 195, the fixing portion 140 is preferably formed of a resin material having a predetermined strength so that the fixing portion 140 is not damaged.

(Modification 7)
In the above embodiment, an example in which the first reference surface 131 of the power substrate 13 and the second flat surface 182 of the connectors 14, 214, 314, 414, 514 abut the first positioning protrusion 113 has been described. The invention is not limited to this. Positioning projections to be in contact with the first reference surface 131 of the power substrate 13 and positioning projections to be in contact with the second flat surface 182 of the connectors 14, 214, 314, 414, 514 may be separately provided.

(Modification 8)
Although the said embodiment demonstrated the example which performs positioning of the power substrate 13 with respect to the thermal radiation base 11 in three places of a pair of 1st positioning projection 113 and the single 2nd positioning projection 114 to the thermal radiation base 11, this invention It is not limited to. By sufficiently taking the length in the longitudinal direction of the first positioning protrusion 113, positioning of the power substrate 13 with respect to the heat dissipation base 11 at two points of the single first positioning protrusion 113 and the single second positioning protrusion 114 You may go.

(Modification 9)
In the first embodiment, a flat surface is provided as a contact surface for contacting the first reference surface 131 of the power substrate 13 with each of the pair of L-shaped convex portions 180A and 180B provided in the terminal holding portion 142 of the connector 14 Although the example in which the first plane 181 is provided is described, the present invention is not limited thereto. For example, instead of the first flat surface 181 provided on each of the pair of L-shaped convex portions 180A and 180B, a curved surface (arc surface) exhibiting a semicircular shape in plan view may be provided. In this case, the curved surfaces (arc surfaces) provided at two locations of the terminal holding portion 142 abut on the first reference surface 131 of the power substrate 13 to define the relative position between the power substrate 13 and the connector 14. Ru.

(Modification 10)
By bringing at least the first reference surface 131 of the power substrate 13 into contact with the first flat surface 181 of the connectors 14, 214, 314, 414, 514, the power substrate 13 and the connectors 14, 214, 314, 414, 514 Positioning of the relative position of can be performed with high accuracy. For this reason, the method of positioning the power substrate 13 with respect to the heat dissipation base 11 is not limited to the above embodiment. For example, the power substrate 13 may be positioned with respect to the heat dissipating base 11 based on the mark attached to the heat dissipating base 11, and the power substrate 13 may be fixed to the heat dissipating base 11 with a screw.

(Modification 11)
Although the said embodiment demonstrated the example used as the mounting base in which the reinforcement part 112a of the support | pillar 112 mounts the fixing | fixed part 140 of the connectors 14, 214, 314, 414, 514, this invention is not limited to this . The support column 112 and the mounting table may be provided separately.

(Modification 12)
Although the said embodiment demonstrated the electronic control unit 100 provided with two circuit boards, this invention is not limited to this. For example, the present invention may be applied to an electronic device provided with a single circuit board having the functions of the power board 13 and the control board 16.

  Hereinafter, the configuration, operation, and effects of the embodiment of the present invention will be collectively described.

  The electronic control unit 100 is connected to the heat dissipation base 11, the power substrate 13 fixed to the heat dissipation base 11, the bus bar unit 15 electrically connected to the power substrate 13, and the other terminal of the other connector. And the connectors 14, 214, 314, 414, 514 electrically connected to the connector 14, and the connectors 14, 214, 314, 414, 514 are not in contact with the heat dissipation base 11 when no external force is applied, It has the control part (191, 291, 391, 691) which contacts with the thermal radiation base 11 when external force acts.

  In this configuration, when an external force is not applied to the connectors 14, 214, 314, 414, 514 so as to insert or remove the mating connector, the restricting portions (191, 291, 391, When the connectors 14, 214, 314, 414, 514 and the bus bar unit 15 are electrically connected by preventing the contact 691) from contacting the heat dissipation base 11, the connectors 14, 214, 314, 414, 514 The restriction portions (191, 291, 391, 691) do not interfere with the alignment between the connectors 14, 214, 314, 414, 514 and the bus bar unit 15. When an external force is applied to the connectors 14, 214, 314, 414, 514 so as to insert and remove the mating connector, the restriction portions (191, 291, 391, 691) of the connectors 14, 214, 314, 414, 514 release the heat radiation base 11. Contact with the connector 14 can reduce stress applied to the connection portion (welding portion 170) of the connector 14, 214, 314, 414, 514 and the bus bar unit 15, and can suppress damage to the connection portion (welding portion 170). .

  The connectors 14, 214, 314, 414, 514 have connection terminals 141, 441, 541 electrically connected to the mating terminals, and a plurality of fixing portions 140 fixed to the heat dissipation base 11, and the bus bar unit The bus 15 includes a bus bar 151 having one end connected to the power substrate 13 and the other end connected to the connection terminals 141, 441 and 541, and a bus bar holding member 152 for holding the bus bar 151. It has a mounting surface 111 a on which the substrate 13 is mounted, and a positioning surface 112 b that defines the position of the connectors 14, 214, 314, 414, 514 by contacting the fixing portion 140.

  In this configuration, when the fixing portion 140 abuts on the positioning surface 112b, the connectors 14, 214, 314, 414, 514 are positioned. That is, the connectors 14, 214, 314, 414, 514 are attached in the direction (z-axis direction) orthogonal to the positioning surface 112 b of the heat dissipation base 11. As a result, when the mating connector is inserted into and removed from the connector 14, 214, 314, 414, 514, the connector 14, 214, 314, 414, 514 can be used as the heat dissipating base 11 for the connector 14, 214, 314, 414, 514. When the external force acts in a direction different from the mounting direction (z-axis direction), the deformation of the connectors 14, 214, 314, 414, 514 is effectively restricted by the restriction portions (191, 291, 391, 691) Can.

  In the electronic control unit 100, the positioning surface 112b is set at a position higher than the mounting surface 111a.

  In this configuration, the position of the point of application of the external force acting on the connectors 14, 214, 314, 414, 514 can be brought close to the position of the fixed support point P of the connectors 14, 214, 314, 414, 514. , 214, 314, 414, 514 can be suppressed more effectively.

  In the electronic control unit 100, the connectors 14, 214, 314, 414, 514 have terminal holding portions 142, 242 for holding the connection terminals 141, 441, 541, and the heat dissipation base 11 is a peripheral region of the mounting surface 111a. It has a step surface 111c located on the bottom side of the heat dissipation base 11 rather than 111b, and the restricting portion is a projection 191 projecting from the bottom of the terminal holding portion 142, 242 toward the step surface 111c. The gap 199 between the peripheral region 111b of the terminal and the terminal holding portions 142 and 242 is covered.

  In this configuration, since the protrusion 191 covers the gap 199 between the peripheral area 111b of the mounting surface 111a and the terminal holding portion 142, 242, the appearance can be improved, and foreign matter such as dust, water droplets and the like are electronic Intrusion inside control unit 100 can be suppressed.

  In the electronic control unit 100, the connector 14 has a terminal holding portion 142 for holding the connection terminal 141, the heat dissipation base 11 has a protrusion 111d that protrudes from the peripheral area 111b of the mounting surface 111a, and the restricting portion is It is a concave portion 691 provided on the bottom surface of the terminal holding portion 142 and into which the protrusion 111 d is inserted, and the protrusion 111 d covers the gap 199 between the peripheral region 111 b of the mounting surface 111 a and the terminal holding portion 142.

  In this configuration, since the protrusion 111 d covers the gap 199 between the peripheral area 111 b of the mounting surface 111 a and the terminal holding portion 142, the appearance can be improved, and foreign substances such as dust and water droplets are included in the electronic control unit 100. It can control that it invades inside.

  The electronic control unit 100 has bus bar connection plates 146, 446, 546 in which connection terminals 141, 441, 541 are connected to the bus bars 151, and the bus bar connection plates 146, 446, 546 have bending portions 146c, 441 a, 441 b. , 441c.

  In this configuration, by providing the bent portions 146c, 441a, 441b, 441c in the bus bar connection plates 146, 446, 546, the path lengths of the bus bar connection plates 146, 446, 546 can be made longer. This suppresses the influence exerted by the external force generated on connectors 14, 214, 314, 414, 514 on the connection portion (welding portion 170) between connection terminals 141, 441, 541 and bus bar 151, and this connection portion (welding portion 170). Stress) can be reduced.

  In the electronic control unit 100, the restricting portion restricts the deformation of the connectors 214 and 314 in the first direction (the protruding portion 191), and the connector 214 in the second direction opposite to the first direction. , 314, and a second restricting portion (regulating portions 291 and 391) for restricting the deformation.

  In this configuration, when attaching or detaching the mating connector to / from the connectors 214/314, bending of the connectors 214/314 due to external force from various directions generated in the connectors 214/314 can be restricted.

  As mentioned above, although the embodiment of the present invention was described, the above-mentioned embodiment showed only a part of application example of the present invention, and in the meaning of limiting the technical scope of the present invention to the concrete composition of the above-mentioned embodiment. Absent.

  11 ... heat radiation base (base), 13 ... power board (circuit board), 14, 214, 314, 414, 514 ... connector, 15 ... bus bar unit, 100 ... electronic control unit ( Electronic device) 111a: mounting surface 111b: peripheral region 111c: step surface 111d: projection 112b: positioning surface 140: fixing portion 141, 441, 541 · · · connection terminals, 142, 242 · · · terminal holding portion, 146, 446, 546 · · · bus bar connection plate (bus bar connection portion), 146 c · · · bent portion, 151 · · bus bar, 152 · · · · Bus bar holding member, 191 · · · · · · · · · Protrusions (regulating portion, first regulating portion), 199 · · · · ·, 291, 391 · · · regulating portion (second regulating portion), 441a, 441b, 441 c Bow Department, 691 ... recess (regulating portion)

Claims (7)

Base and
A circuit board fixed to the base;
A bus bar unit electrically connected to the circuit board;
A connector connected to the mating terminal of the mating connector and electrically connected to the bus bar unit;
The electronic device is characterized in that the connector is not in contact with the base when an external force is not applied, and has a restricting portion that is in contact with the base when an external force is applied. In the electronic device according to claim 1,
The connector includes a connection terminal electrically connected to the mating terminal, and a plurality of fixing portions fixed to the base,
The bus bar unit has a bus bar having one end connected to the circuit board and the other end connected to the connection terminal, and a bus bar holding member for holding the bus bar.
Electronic equipment, characterized in that the base has a mounting surface on which the circuit board is mounted, and a positioning surface that defines the position of the connector by coming into contact with the fixing portion. In the electronic device according to claim 2,
The electronic apparatus characterized in that the positioning surface is set at a higher position than the mounting surface. In the electronic device according to claim 2 or 3,
The connector has a terminal holding portion for holding the connection terminal,
The base has a stepped surface located closer to the bottom of the base than the peripheral area of the mounting surface,
The restricting portion is a projecting portion that protrudes from the bottom surface of the terminal holding portion toward the step surface, and covers a gap between the peripheral region of the mounting surface and the terminal holding portion. machine. In the electronic device according to claim 2 or 3,
The connector has a terminal holding portion for holding the connection terminal,
The base has a projection projecting from a peripheral area of the mounting surface,
The restriction portion is a concave portion provided on the bottom surface of the terminal holding portion and into which the protrusion is inserted.
The electronic device is characterized in that the protrusion covers a gap between a peripheral region of the mounting surface and the terminal holding portion. The electronic device according to any one of claims 2 to 5,
The connection terminal includes a bus bar connection portion connected to the bus bar,
The said bus-bar connection part has a bending part. The electronic device characterized by the above-mentioned. The electronic device according to any one of claims 1 to 6.
The regulatory unit
A first restricting portion that restricts deformation of the connector in a first direction;
And a second restricting portion that restricts deformation of the connector in a second direction opposite to the first direction.

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