JP6522358B2 - Electric drive device and electric power steering device - Google Patents

Description

  The present invention relates to an electric drive apparatus and an electric power steering apparatus, and more particularly to an electric drive apparatus and an electric power steering apparatus incorporating an electronic control unit.

  In the general industrial machine field, mechanical control elements are driven by an electric motor. Recently, an electronic control unit comprising a semiconductor element or the like for controlling the rotational speed and rotational torque of the electric motor is electrically operated. A so-called mechanical-electrical integrated type electric drive integrated with a motor has begun to be adopted.

  For example, in an electric power steering apparatus of an automobile, as an example of a motor-electrical integrated type electric drive apparatus, a driver detects a rotation direction and a rotation torque of a steering shaft which is rotated by operating a steering wheel. The electric motor is driven to rotate in the same direction as the rotation direction of the steering shaft based on the detected value, and a steering assist torque is generated. In order to control this electric motor, an electronic control unit (ECU: Electronic Control Unit) is provided in the power steering device.

  As a conventional electric power steering apparatus, for example, the one described in Japanese Patent Application Laid-Open No. 2013-60119 (Patent Document 1) is known. Patent Document 1 describes an electric power steering apparatus configured by an electric motor and an electronic control unit. The electric motor is housed in a motor housing having a tubular portion made of aluminum alloy or the like, and the electronic control unit is housed in an ECU housing disposed on the opposite side of the axial output shaft of the motor housing. There is. The electronic control unit housed inside the ECU housing includes a power conversion circuit including a power supply circuit, a MOSFET for driving and controlling an electric motor, or a power switching device such as an IGBT, and a control circuit for controlling the power switching device. The output terminal of the power switching element and the input terminal of the electric motor are electrically connected via a bus bar.

  Then, the electronic control unit housed in the ECU housing is supplied with power from the power supply through the connector terminal assembly made of synthetic resin, and detection signals such as the operating state are supplied from the detection sensors and the like. . The connector terminal assembly functions as a lid, is connected to the electronic control unit so as to close an opening formed in the ECU housing, and is fixed to the outer surface of the ECU housing by a fixing bolt.

  In addition to the above, as an electric drive unit in which an electronic control unit is integrated, an electric brake, an electric hydraulic controller for controlling various hydraulic pressure, and the like are known.

JP, 2013-60119, A

  By the way, since the electric power steering apparatus described in Patent Document 1 is disposed in an engine room of a car, it is necessary to be configured in a small size. In recent years, a lot of accessories such as exhaust gas control devices and safety control devices tend to be installed in the engine room of automobiles recently, and various accessories such as electric power steering devices should be miniaturized as much as possible. It is required to reduce the number of parts.

  In the electric power steering apparatus configured as described in Patent Document 1, the power supply circuit unit, the power conversion circuit unit, and the control circuit unit are mounted on two boards. Although not described in Patent Document 1, aluminum or an aluminum alloy having a thickness equal to or greater than a predetermined length is required to dissipate heat generated from the power supply circuit unit and the electric components constituting the power conversion circuit unit. And the heat dissipating base is disposed in the radial direction in the ECU housing or motor housing, and the metal substrate of the power supply circuit portion and the power conversion circuit portion on one side or both sides of the heat dissipating base It is effective that the heat dissipation base be bonded to the ECU housing to perform heat dissipation.

  When the heat dissipating substrate is used as described above, the metal substrates of the power supply circuit portion and the power conversion circuit portion are fixed to the heat dissipating substrate with the fixing screws. As described above, in order to satisfy the demand for downsizing, it is effective to mount the power supply circuit unit and the power conversion circuit unit at high density. However, the area of the metal substrate is extra due to the fixing screw for fixing the metal substrate to the heat dissipation base, and there is a problem that the miniaturization of the power supply circuit unit and the power conversion circuit unit is inhibited.

  In addition, the problem of increasing the number of parts by increasing the number of fixing screws for coupling the heat dissipation base and the metal substrate accompanying this, and further, since the number of parts is large, the assembly man-hour increases and it is comprehensive There has been a problem that the manufacturing cost is high.

  An object of the present invention is to provide a novel electric drive device and an electric power provided with a heat dissipating structure having a simple structure with the number of parts reduced as much as possible while suppressing the radial enlargement of the power supply circuit unit and the power conversion circuit unit. To provide a steering device.

  A feature of the present invention is that a metal heat dissipating base in thermal contact with the inner periphery of the ECU housing is disposed in the housing space of the ECU housing and the motor housing, and is disposed on the metal substrate of the circuit unit that controls the electric motor. The metal terminal of the circuit unit for controlling the electric motor is pressed and fixed to the heat dissipation base by the connector terminal connected to the connector.

  According to the present invention, since the fixing screw for fixing the metal substrate to the heat dissipation base can be omitted, the area of the metal substrate can be reduced by the fixing screw for fixing the metal substrate to the heat dissipation base. It can be miniaturized. Further, since the fixing screw for coupling the heat dissipation base and the metal substrate can be omitted, the number of parts can be reduced.

FIG. 1 is an overall perspective view of a steering device as one example to which the present invention is applied. FIG. 1 is an overall perspective view of an electric power steering apparatus as a machine-electric integrated electric drive apparatus. FIG. 1 is an exploded perspective view of an electric power steering apparatus according to an embodiment of the present invention. It is a perspective view of the power supply circuit unit shown in FIG. It is a perspective view of the power inverter circuit unit shown in FIG. It is a perspective view of the control circuit unit shown in FIG. It is a perspective view of a lid shown in FIG. It is the top view which looked at the lid side from the direction of the AA surface shown in FIG. It is sectional drawing which shows the cross section of the electric path | pass steering apparatus seen from the BB surface of FIG. However, the electric motor part is omitted. It is sectional drawing which shows the cross section of the electric path | pass steering apparatus seen from CC surface of FIG. However, the electric motor part is omitted. It is sectional drawing which shows the cross section of the electric path | pass steering apparatus seen from the DD surface of FIG. However, the electric motor part is omitted.

  Hereinafter, although the embodiment of the present invention will be described in detail with reference to the drawings, the present invention is not limited to the following embodiment, and various modifications and applications can be made within the technical concept of the present invention. Is also included in that range.

  A configuration of a steering apparatus as an example to which the present invention is applied before describing an embodiment of the present invention, and a configuration of an electric power steering apparatus as an electric drive apparatus of a mechanical-electrical integrated type are simple using FIGS. 1 and 2 Explain to.

  First, a steering device for steering a front wheel of a vehicle will be described. The steering device 1 is configured as shown in FIG. A pinion (not shown) is provided at the lower end of the steering shaft 2 connected to a steering wheel (not shown), and this pinion meshes with a rack (not shown) which is long in the left-right direction of the vehicle body. Tie rods 3 for steering the front wheels in the left and right direction are connected to both ends of the rack, and the rack is covered by a rack housing 4. A rubber boot 5 is provided between the rack housing 4 and the tie rod 3.

  An electric power steering device 6 is provided to assist torque when the steering wheel is turned. That is, an electric motor unit 8 provided with a torque sensor 7 for detecting the rotational direction and rotational torque of the steering shaft 2 and applying a steering assist force to the rack via the gear 10 based on the detection value of the torque sensor 7 And an electronic control unit (ECU) unit 9 that controls an electric motor disposed in the electric motor unit 8. The electric motor unit 8 of the electric power steering apparatus 6 is connected to the gear 10 at three locations on the outer periphery on the output shaft side via bolts (not shown), and the electronic control unit on the opposite side of the output shaft of the electric motor 8 9 is provided.

  As shown in FIG. 2, the electric motor unit 8 is composed of a motor housing 11A having a cylindrical portion made of aluminum alloy or the like and an electric motor (not shown) housed therein, and the electronic control unit 9 is a motor housing An ECU housing 11B made of an aluminum alloy or the like and an electronic control assembly (not shown) housed in the ECU housing 11B are disposed on the side opposite to the axial output shaft 11A.

  The motor housing 11A and the ECU housing 11B are integrally fixed at their opposing end faces by fixing bolts. The electronic control assembly housed in the inside of the ECU housing 11B is a power conversion unit having a power supply circuit unit that generates a necessary power supply, and a power switching element such as a MOSFET or an IGBT that drives and controls the electric motor of the electric motor unit 8. A circuit and a control circuit unit for controlling the power switching element are provided, and the output terminal of the power switching element and the input terminal of the electric motor are electrically connected via a bus bar.

  A lid 12 made of synthetic resin, which also serves as a connector terminal assembly, is fixed to the end face of the ECU housing 11B by a fixing bolt. The cover 12 is provided with a connector terminal forming portion 12A for power supply, a connector terminal forming portion 12B for a detection sensor, and a connector terminal forming portion 12C for control state transmission for transmitting a control state to an external device. The electronic control assembly housed in the ECU housing 11B is supplied with power from the power supply through the connector terminal forming portion 12A for power supply of the lid 12 made of synthetic resin, and is operated from the detection sensors A detection signal of a state or the like is supplied through the connector forming terminal portion 12B for the detection sensor, and a control state signal of the current electric power steering apparatus is transmitted through the connector terminal forming portion 12C for control state transmission.

  Here, although the lid 12 is shaped to cover the entire opening of the ECU housing 11B, each connector terminal is formed in a small size, and the insertion hole formed in the ECU housing 11B is inserted into the electronic device. It may be configured to be connected to the control assembly.

  In the electric power steering apparatus 6 configured as described above, when the steering shaft 2 is turned in any direction by operating the steering wheel, the turning direction and the turning torque of the steering shaft 2 The torque sensor 7 detects the torque sensor 7, and the control circuit calculates the drive operation amount of the electric motor based on the detected value. The electric motor is driven by the power switching element of the power conversion circuit unit based on the calculated driving operation amount, and the output shaft of the electric motor is rotated so as to drive the steering shaft 1 in the same direction as the operation direction. The rotation of the output shaft is transmitted from a pinion (not shown) to a rack (not shown) via the gear 10 to steer the vehicle. Since these configurations and actions are already well known, further description is omitted.

  In such an electric power steering apparatus, aluminum or an aluminum alloy having a thickness equal to or greater than a predetermined length is used as a heat dissipation base in order to dissipate heat generated from electric components constituting the power supply circuit portion and the power conversion circuit portion. Then, the heat dissipating base is arranged radially in the ECU housing, and the power circuit and the power conversion circuit metal substrate are joined to one side or both sides of the heat dissipating base so that the heat dissipating base is It is effective to couple to the housing for heat dissipation.

  When the heat dissipating substrate is used as described above, the metal substrates of the power supply circuit portion and the power conversion circuit portion are fixed to the heat dissipating substrate with the fixing screws. As described above, in order to satisfy the demand for downsizing, it is effective to mount the power supply circuit unit and the power conversion circuit unit at high density. However, the area of the metal substrate is extra due to the fixing screw for fixing the metal substrate to the heat dissipation base, and there is a problem that the miniaturization of the power supply circuit unit and the power conversion circuit unit is inhibited. In addition, the problem of increasing the number of parts by increasing the number of fixing screws for coupling the heat dissipation base and the metal substrate accompanying this, and further, since the number of parts is large, the assembly man-hour increases and it is comprehensive There has been a problem that the manufacturing cost is high.

  From such a background, the present embodiment proposes an electric power steering apparatus having the following configuration.

  That is, in the present embodiment, a metal heat dissipating base in thermal contact with the inner periphery of the ECU housing is disposed in the housing space of the ECU housing and the motor housing, and on the metal substrate of the circuit portion that controls the electric motor. The metal substrate of the circuit unit for controlling the electric motor is pressed against the heat dissipation base by the connector terminal connected to the arranged connector, and fixed.

  More specifically, among the circuit units for controlling the electric motor, the power supply circuit unit, or the power conversion circuit unit, or the power supply circuit unit, the metal substrate of the power conversion circuit unit and the heat dissipation base are not used Power supply circuit unit or power conversion circuit unit or a connector terminal connected to the power supply circuit unit and a connector of the power conversion circuit unit, the power supply circuit unit or power conversion circuit unit or power supply circuit unit and power conversion circuit unit The metal substrate is pressed against the heat dissipation base and fixed.

  By this, the fixing screw for fixing the metal substrate to the heat dissipation base can be omitted, so the area of the metal substrate can be reduced by the fixing screw for fixing the metal substrate to the heat dissipation base, and the power circuit portion and the power conversion circuit portion can be miniaturized. can do. In addition, since the fixing screw for coupling the heat dissipation base and the metal substrate can be omitted concomitantly, the number of parts can be reduced.

  Hereinafter, although the configuration of the electric power steering apparatus according to an embodiment of the present invention will be described, the shape of the lid 12 shown in FIG. 2 is different in the following drawings. However, their functions are identical.

  An exploded perspective view of the electric power steering apparatus 6 is shown in FIG. Incidentally, an electric motor is usually accommodated in the motor housing 11A. As described above, the motor housing 11A and the ECU housing 11B are made of separate aluminum alloys, but both housings may be the same housing.

  The electronic control unit 9 includes an ECU housing 11B coupled to the motor housing 11A on the side opposite to the output shaft (not shown) of the electric motor and a lid 12 coupled to the ECU housing 11B by three fixing bolts 13. It is configured. The lid 12 also serves as a connector terminal assembly, as will be described later, and is formed by injection molding of synthetic resin. In addition, various connector wiring portions are simultaneously embedded in the lid 12 by insert molding as described later.

  A power supply circuit unit 14 is provided in a housing space formed by the ECU housing 11B and the lid 12, and a power conversion circuit unit 15 and a control circuit unit 16 are disposed in the housing space of the ECU housing 11B and the motor housing 11A. ing. The power supply circuit unit 14, the power conversion circuit unit 15, and the control circuit unit 16 constitute an electronic control assembly.

  A heat dissipation base 53 made of metal such as aluminum or aluminum alloy is disposed inside the ECU housing 11B. The heat dissipation base 53 is integrally formed with the ECU housing 11B. Further, metal substrates 17 and 18 on which electric components constituting the power supply circuit unit 14 and the power conversion circuit unit 15 are mounted are fixed on both surfaces of the heat dissipation base 53 by single-sided mounting.

  As described above, the heat dissipation base 53 made of aluminum or aluminum alloy having a predetermined thickness is disposed between the metal substrate 17 and the metal substrate 18, and the heat dissipation base 53 functions as a heat dissipation member as described later. It is integrally formed with the ECU housing 11B, and is configured to be able to dissipate heat from the ECU housing 11B to the outside air. Here, the metal substrates 17 and 18 and the heat dissipating substrate 53 have a heat dissipating adhesive such as a heat dissipating adhesive, a heat dissipating sheet, and a heat dissipating grease having good thermal conductivity to enhance thermal contact. Interspersed between.

  A power supply circuit whose main function is to generate a high voltage DC power supply used for an inverter device for driving an electric motor and a low voltage DC power supply used for a control circuit such as a microcomputer between the lid 12 and the heat dissipation base 53 The part 14 is arranged.

  As shown in FIG. 4, the power supply circuit unit 14 includes a capacitor 19, a coil 20, a switching element 21 made of a MOSFET, and a power supply side from a battery on one surface of a metal substrate 17 made of metal such as aluminum. The power supply side connector 22 to which the connector terminal is connected, the high voltage side connector 23 to which the high voltage side connector terminal supplying the high voltage power supply to the power conversion circuit unit 15 is connected, and the low voltage side connector terminal supplying the low voltage power supply to the control circuit unit 16 Electrical components such as the low voltage side connector 24 to be connected are mounted.

  The metal substrate 17 is formed by forming an insulating layer on an aluminum substrate, and printing a wiring pattern made of copper foil on the insulating layer, on which an electrical component is mounted for each electric The parts are electrically connected. The power supply circuit unit 14 uses electrical components such as the capacitor 19, the coil 20, and the connectors 22 to 24 which are relatively large (= tall).

  The connectors 22 and 23 are press-fit connectors, and have elasticity toward the inside. By simply inserting the connector terminals into the connectors 22 and 23, mutual connection can be easily performed without using solder. Can be secured. As shown in FIG. 4, the connectors 22 and 23 are formed by folding both ends of a single elongated metal plate inward, and further folding the folded area by two so that both end faces face each other.

  The opposite end face has elasticity, and the connector terminal pressed into this end face is in strong contact, and the pressing force given from the connector terminal can be transmitted to the metal substrate 17 through the connectors 22 and 23. is there. In this embodiment, the metal substrate 17 is not fixed to the heat dissipation base 53 by the fixing screw, and the metal base 17 and the heat dissipation base 53 are fixed by the pressing force applied from the connector terminals inserted into the connectors 22 and 23. It is configured. This will be described in detail using FIG. 9 and FIG.

  Further, on the side opposite to the side where the power supply circuit unit 14 of the heat dissipation base 53 is located, a power conversion circuit unit 15 is disposed which executes inverter control whose main function is driving of the electric motor. In the power conversion circuit unit 15, the metal substrate 18 of the power conversion circuit unit 15 is disposed to face the metal substrate 17 of the power supply circuit unit 14 with the heat dissipation base 53 as a boundary.

  The opposing surfaces of the metal substrate 18 of the power conversion circuit unit 15 and the metal substrate 17 of the power supply circuit unit 14 have substantially the same shape, and heat can easily be transmitted to the heat dissipation base 53. . Furthermore, a heat dissipating function material such as a heat dissipating adhesive, a heat dissipating sheet, a heat dissipating grease, and the like having good thermal conductivity is interposed between the metal substrates 17 and 18 and the heat dissipating base 53.

  As shown in FIG. 5, the power conversion circuit unit 15 includes a plurality of MOSFETs or power switching elements 25 made of IGBTs on a metal substrate 18 made of a metal having high thermal conductivity such as aluminum, and an output for output thereof. Connector terminals 27A to 27D are provided to feed back input signals such as gates, drains, sources, etc. that control the connectors 26U, 26V, 26W, and the switching element 25 and the operation status of the switching element 25 to the control circuit unit 16. It is done. In addition, an inverter-side connector 28 that receives supply of power from the power supply circuit unit 14 is also provided. In addition to the six switching elements 25 that control the electric motor, the switching element 25 is also provided with three switching elements 25 for failsafe.

  The connectors 26U, 26V, 26W for output are press-fit connectors, and have elasticity toward the inside, and the connector terminals of the bus bars connected to the electric motor to the connectors 26U, 26V, 26W. By simply inserting, it is possible to easily ensure mutual connection without using solder. As shown in FIG. 5, the connectors 26U, 26V, 26W for output are also formed by folding both ends of one elongated metal plate inwards, and further folding this folded area by two folds so that both end faces face each other. ing.

  However, as shown in FIG. 9, in the present embodiment, an example is shown in which the metal substrate 18 is fixed to the heat dissipation base 53 by fixing screws, but like the metal substrate 17, connectors 26 U for output, 26 V, It goes without saying that the metal substrate 17 and the heat dissipation base 53 may be fixed by the pressing force applied from the connector terminals of the bus bars inserted into 26 W.

  The metal substrate 18 is formed by forming an insulating layer on an aluminum substrate, and printing a wiring pattern made of copper foil on the insulating layer, on which an electrical component is placed for each of the electrical components. The parts are electrically connected. Although FIG. 5 shows the side on which the above-mentioned electric component is mounted for easy understanding, in fact, as shown in FIG. 3, the electric component is disposed so as to be on the lower side.

  Between the power conversion circuit unit 15 and the motor housing 11A, a control circuit unit 16 mainly having a switching control of the switching element 25 of the power conversion circuit unit 15 is disposed. A resin substrate mounting boss 29 is formed on the ECU housing 11B toward the motor housing 11A, and the resin substrate 31 of the control circuit section 16 is fixed to the resin substrate mounting boss 29 by a mounting bolt.

  As shown in FIG. 6, in the control circuit unit 16, a microcomputer 32 or the like for controlling the switching element 25 and the like is mounted on a resin substrate 31 made of synthetic resin or the like. As shown in FIG. 3, on the resin substrate 31, electrical components such as peripheral circuits of the microcomputer 32 are disposed, but these are omitted in FIG.

  The resin substrate 31 is disposed at a predetermined distance from the power conversion circuit unit 15, and the electrical components of the power conversion circuit unit 15 and the electrical components of the control circuit unit 16 are disposed in the space therebetween. The control circuit unit 16 and the power conversion circuit unit 15 are connected by the connector terminals 27A to 27D described above.

  The connector terminals 27A to 27D have a length exceeding a predetermined distance between the resin substrate 31 and the power conversion circuit unit 15. The connector terminal 27A is connected to the connection hole 33A of the resin substrate 31, the connector terminal 27B is connected to the connection hole 33B, the connector terminal 27C is connected to the connection hole 33C, and the connector terminal 27D is connected to the connection hole 33D. It is supposed to be. The connection holes 33E formed in the control board 31 are connected to control side connector terminals for signal transmission and low voltage power supply embedded in an insulating region of the lid 12 described later.

  As described above, the power supply circuit unit 14, the heat dissipation base 53, the power conversion circuit unit 15, and the control circuit unit 16 are disposed in this order from the cover 12 toward the motor housing 11 A. By arranging the control circuit unit 16 at such a distance from the power supply circuit unit 14, it is possible to provide a stable power supply to the control circuit unit 16 after removing power supply noise.

  Returning to FIG. 3, the cover 12 in which the connector wiring portion is embedded covers the opening of the ECU housing 11B, and as in the case shown in FIG. A terminal forming unit 12A, a connector terminal forming unit 12B for a detection sensor, and a connector terminal forming unit 12C for transmitting a control state for transmitting a control state to an external device are provided. The connector terminal forming portion 12B and the connector terminal forming portion 12C may be integrally formed. And electric power is supplied to the power supply circuit unit 14 from the power supply which is not shown in figure via these connector terminal formation parts 12A-12C. Similarly, a signal of a detection sensor or the like is input to the control circuit unit 16.

  Next, the configuration of the lid 12 will be described. As shown in FIG. 7, the lid 12 is formed of a synthetic resin, and the lid 12 doubles as a connector terminal assembly, and various connectors are internally provided. A wiring portion and its connector terminal are provided. Specific wiring portions will be described with reference to FIGS.

  First, the power supply side connector wiring portion, which is a connector wiring portion for supplying power, connecting the power supply circuit portion 14 and the connector terminal forming portion 12A connected to the external power supply (= vehicle battery) is buried in the lid 12 The power source side connector terminal 34 at the front end is exposed from the lid 12. The power supply side connector terminal 34 is located inside the side peripheral surface of the lid 12 (surface which forms a seal area with the ECU housing described later).

The power supply side connector terminal 34 is connected to the power supply side connector 22 of the power supply circuit unit 14, and the connection is completed simply by inserting the power supply side connector terminal 34 into the press fit type power supply side connector 22. It is. The power supply side connector wiring portion is shown in FIG . The power supply side connector terminal 34 is inserted into the press fit type power supply side connector 22 and has a function of strongly pressing the metal substrate 17 against the heat dissipation base 53.

Next, referring to FIGS. 8 and 10 , a high voltage side connector wiring portion, which is a connector wiring portion for supplying power, connecting the power supply circuit portion 14 and the power conversion circuit portion 15 is embedded in the lid 12. Both ends of the high voltage side connector wiring portion are formed as the high voltage side connector terminal 35 and the inverter side connector terminal 36 and exposed from the lid 12. One high voltage side connector terminal 35 is connected to the high voltage side connector 23 of the power supply circuit unit 14, and the other inverter side connector terminal 36 is connected to the inverter side connector 28 of the power conversion circuit unit 15.

  The high voltage side connector terminal 35 is connected to the high voltage side connector 23 of the power supply circuit section 14, and simply by inserting the high voltage side connector terminal 35 into the press fit type high voltage side connector 23, it is easy to use without solder. The connection is complete. The high voltage side connector terminal 35 is inserted into the press fit type high voltage side connector 23 and has a function of strongly pressing the metal substrate 17 against the heat dissipation base 53.

  The inverter-side connector terminal is connected to the inverter-side connector 28 of the power conversion circuit unit 15, and the connection is completed by TIG welding the inverter-side connector terminal 36 and the inverter-side connector 28.

The high-voltage connector wiring portion has a U-shaped cross section between the high-voltage connector terminal 35 and the inverter-side connector terminal 36 in which the inverter-side connector terminal is longer. This long portion is embedded in the synthetic resin forming the lid 12 to form a high voltage side insulating region 45. The high voltage side insulating region 45 is, as shown in FIG. The insertion portion formed at 53 is inserted to extend to the power conversion circuit unit 15. The insertion portion may be a "notch" formed on the outer peripheral side of the metal substrates 17 and 18 and the heat dissipation base 53, or may be an "insertion hole". Further, the high voltage side insulating region 45 constituting the high voltage side connector wiring portion is located between the outer peripheral side of the metal substrates 17 and 18 and the heat dissipation base 53 and the inside of the side peripheral surface of the lid 12. This will be described in more detail in FIG. 10.

Next, referring to FIG. 11 , a low voltage side connector wiring portion, which is a connector wiring portion for supplying power, connecting the power supply circuit portion 14 and the control circuit portion 16 is embedded in the lid 12. Both ends of the low voltage side connector wiring portion are formed as the low voltage side connector terminal 37 and the control side connector terminal 38 and are exposed from the lid 12. One low voltage side connector terminal 37 is connected to the low voltage side connector 24 of the power supply circuit unit 14, and the other control side connector terminal 38 is connected to the connection hole 33 E of the control circuit unit 16.

Further, the signal transmission connector wiring portion for signal transmission connected to the connector terminal forming portion 12B for the detection sensor and the connector terminal forming portion 12C for sending the control state adjacent to the low voltage side connector wiring portion is the lid 12 And the control side connector terminal 39 is exposed from the lid 12. Similarly, the low voltage side connector wiring portion is shown in FIG .

Next, referring to FIGS. 6 and 7, the low voltage side connector terminal 37 is connected to the low voltage side connector 24 of the power supply circuit section 14, and the low voltage side connector terminal is fitted to the socket type low voltage side connector 24. Connection is completed only by doing. Further, the control side connector terminal 38 and the control side connector terminal 39 for signal transmission are connected to the connection hole 33E of the control circuit section 16, and the control side connector terminals 38, 39 and the connection hole 33E are joined by solder. Connection is completed by doing.

The low voltage side connector wiring portion and the signal transmission connector wiring portion described above are embedded in the synthetic resin forming the lid 12 to form a low voltage side insulating region portion 46. This low voltage side insulating region portion 46 is shown in FIG. It extends to the control circuit portion 16 by inserting the insertion portion formed on the outer peripheral side end face of the metal substrates 17 and 18 in a certain manner. The insertion portion may be a "notch" formed on the outer periphery of the metal substrates 17, 18 and the heat dissipation base 53, or may be an "insertion hole". Further, the low voltage side insulating area portion 46 constituting the low voltage side connector wiring portion is located between the outer peripheral side of the metal substrates 17 and 18 and the inside of the side peripheral surface of the lid 12. This will be described in more detail in FIG. 11.

  As shown in FIG. 7, the power supply side connector terminal 34, the high voltage side connector terminal portion 35, and the inverter side connector terminal are arranged close to the outer peripheral side of each substrate of the power supply circuit unit 14, the power conversion circuit unit 15 and the control circuit unit 16. The portion 36, the low voltage side connector terminal portion 37, the control side connector terminal portion 38, and the control side connector terminal 39 are disposed so as to be located.

  As a result, the electric components constituting the power supply circuit unit 14, the power conversion circuit unit 15 and the control circuit unit 16 can be disposed close to the centers of the respective substrates, so that miniaturization can be achieved in the radial direction.

The order in which the electric power steering apparatus shown in FIG. 3 is assembled is as follows. First, the metal substrate 17 of the power supply circuit unit 14 is made to face the heat dissipation base 53, and the lid 12 is fixed to the ECU housing 11B in this state. At this time, the power supply side connector terminal 34 is inserted into the power supply side connector 22, and the high voltage side connector terminal 35 is inserted into the high voltage side connector 23, whereby the metal substrate 17 is pressed against the heat dissipation base 53 and fixed. In some cases, the low voltage side connector terminal 37 may be inserted into the low voltage side connector 24 to press the metal substrate 17 against the heat dissipation base 53.

  Therefore, in this state, the connection of the power supply side connector 22 and the power supply side connector terminal 34 of the power supply circuit unit 14 is completed, and the connection of the high voltage side connector 23 and the high voltage side connector terminal 35 of the high voltage side connector wiring portion is completed. Further, the connection between the low voltage side connector 24 and the low voltage side connector terminal 37 is completed.

  Next, the metal substrate 18 of the power conversion circuit unit 15 is fixed to the heat dissipation base 53 by fixing screws, and the power supply circuit unit 14, the power conversion circuit section 15 and the heat dissipation base 53 are integrated.

  In this state, since the high voltage side insulating region portion 45 protrudes from the power conversion circuit portion 15, the inverter side connector terminal 36 and the inverter side connector 28 exposed from here are joined using a TIG welding torch.

  Next, a fixing bolt is inserted into the control circuit portion 16 and screwed into the resin substrate mounting boss 29 to integrate the control circuit portion 11 and the ECU housing 11B.

  In this state, the connection holes 33A to 33E formed in the resin substrate 31 of the control circuit unit 14 and the corresponding connector terminals 27A to 27D, 38, 39 are soldered and joined. Thus, the electronic control unit 9 is completed.

  The motor housing 11A and the ECU housing 11B are integrated by fixing the electronic control unit 9 to the motor housing 11A with fixing bolts using a mounting flange formed on the ECU housing 11B.

  Next, the details of the configuration of the electronic control assembly housed in the ECU housing 11B will be described with reference to FIGS.

  FIG. 8 is a view of the lid 12 viewed from the plane A-A shown in FIG. 3, and shows the plane of the power conversion circuit unit 15. The detailed configuration of the power conversion circuit unit 15 is as shown in FIG. 5 and thus the description thereof is omitted, but the important point is that the insertion portions 40 and 47 formed on the outer peripheral side end face of the metal substrate 18 are formed It is.

The insertion portion 40 is a linear notch formed on the outer periphery of the metal substrate 18, and the low voltage side insulating region portion 46 described above extends through the insertion portion 40 to the control circuit portion 16 side. The reason why the linear “notches” are formed in this way is that the number of wiring portions passing through the low voltage side insulating area 46 is large, and the area of the “notches” is increased to insert the low voltage side insulating area 46. It is. Of course, the metal substrate 17 and the heat dissipation base 53 are also formed with the insertion portions 41 of the metal substrate 17 and the insertion portions 42 of the heat dissipation base 53 which coincide with the insertion portions 40 formed on the metal substrate 18 as shown in FIG. Needless to say,

Similarly, referring to FIG. 10, the insertion portion 47 is a “notch” formed on the outer periphery of the metal substrate 18, and the high voltage side insulation region portion 45 described above through the insertion portion 47 is on the power conversion circuit portion 15 side. It has been extended to It goes without saying that the metal substrate 17 and the heat dissipation base 53 are also formed with the insertion portion that matches the insertion portion 47 formed on the metal substrate 18.

  Next, a cross section of the electric power steering apparatus viewed from the B-B plane of FIG. 8 will be described based on FIG. 9, but the electric motor portion is omitted in FIG.

  In FIG. 9, the ECU housing 11B and the motor housing 11A are fixed by a plurality of fixing bolts 43 screwed into mounting flanges formed respectively. Similarly, the ECU housing 11B and the lid 12 are fixed by a plurality of fixing bolts 13 screwed into mounting flanges formed respectively.

  A portion of the lid 12 excluding the connector terminal forming portions 12A to 12C is housed in the opening of the ECU housing 11B, and the outer circumferential surface of the lid 12 is in close contact with the inner circumferential surface of the ECU housing 11B. A seal ring 52 is provided on the outer peripheral surface of the lid 12. The seal ring 52 prevents water or the like from entering between the lid 12 and the ECU housing 11B.

  A metal substrate mounting screw 54 for fixing the metal substrate 18 of the power conversion circuit unit 15 to the heat dissipation base 53 is formed on the heat dissipation base 53 on the motor housing 11A side. The metal board mounting screw portion 54 is generally formed in four places, but in the present embodiment, one place is omitted and formed in three places. The reason for this is to reduce the occupied area of the screw of the metal substrate 18 of the power conversion circuit unit 15 as much as possible and to reduce the number of fixing bolts.

  An insertion hole through which the fixing bolt 44 is inserted is formed in the metal substrate 18 of the power conversion circuit unit 15, and screwing the fixing bolt 44 from the metal substrate 18 side of the power conversion circuit unit 15 into the metal substrate mounting screw 54 Thus, the metal substrate 18 of the power conversion circuit unit 15 is firmly fixed to the metal substrate mounting screw 54. Furthermore, the metal substrate 17 and the metal substrate 18 are disposed facing each other with the heat dissipation base 53 interposed therebetween, so that heat can be transferred mutually.

  As described in FIG. 3, the heat dissipation base 53 has a function of releasing the heat from the power supply circuit unit 14 and the power conversion circuit unit 16 to the ECU housing 11 B through the metal substrates 17 and 18, and thus the ECU housing The inner peripheral side of 11 B and the outer peripheral side of the heat dissipation base 53 are in thermal contact with each other. In the present embodiment, the heat dissipation base 53 and the ECU housing 11B are integrally formed, but in order to form them separately and enhance the thermal contact between them, a heat transfer adhesive with good thermal conductivity It is also possible to interpose a heat dissipating function material such as an agent, a heat dissipating sheet, or a heat dissipating grease between the outer peripheral surface of the heat dissipating base 53 and the inner peripheral surface of the ECU housing 11B.

  In addition, between the metal substrate 17 of the power supply circuit unit 14 and the inner bottom surface of the lid 12, an electrical component having a large shape such as a capacitor or a coil constituting the power supply circuit unit 14 is accommodated. Because these electrical components are large in size, a large storage space is required. Therefore, in the present embodiment, a large storage space is formed by utilizing the fact that the seal area formed between the outer peripheral surface of the lid 12 and the inner peripheral surface of the ECU housing 11B is long.

  That is, since the electric power steering apparatus is disposed in the engine room of a car, when traveling on a road with rain or puddles, the electric power steering apparatus may be covered by rain water or puddle water. It often occurs. For this reason, the contact area of the ECU housing 11B and the lid 12 needs to ensure sufficient water tightness, and the seal area of both is lengthened, and two seal rings 52 are arranged in the seal area.

  As described above, since the seal ring 52 is provided in a double manner, reliable water tightness can be secured, and a long housing area forms a large housing space between the lid 12 and the metal substrate 17 of the power supply circuit portion 14. It is possible to easily fit the power supply circuit unit 15 composed of a large electric component. As described above, the space generated to ensure water tightness is effectively used to accommodate the power supply circuit unit 15 formed of a large electric component.

This makes it possible to shorten the axial length as much as possible. Further, since the power supply side connector terminal 34 connected to the power supply is directly inserted and connected facing the press-fit type power supply side connector 22 of the power supply circuit unit 14, the assembling work is easy. Become. This will be described in FIG. 11.

  Next, a cross section of the electric path-steering apparatus as viewed from the C-C plane of FIG. 8 will be described based on FIG. 10, but the electric motor portion is also omitted in FIG.

  In FIG. 10, a high voltage side insulating region 45 made of synthetic resin extends from the inner bottom surface of the lid 12 toward the control circuit 16 side. The high voltage side insulating region portion 45 is inserted into the insertion portion 48 provided on the outer peripheral portion of the metal substrate 17, the insertion portion 47 provided on the outer peripheral portion of the metal substrate 18, and the insertion portion 55 provided on the heat dissipation base 53. It extends to the part 15. The insertion portions 47 and 48 of the metal substrates 17 and 18 are formed between the outer peripheral surface of the metal substrates 17 and 18 and the side peripheral surface of the lid 12, and the insertion portions 55 of the heat dissipation base 53 are of the heat dissipation base 53. It is an insertion hole formed inside in the outer peripheral side.

  A high voltage side connector wiring portion 49 is embedded in the high voltage side insulating region portion 45. A high voltage side connector terminal 35 is formed on one side of the high voltage side connector wiring portion 49, and an inverter side connector terminal 36 is formed on the other side. Is formed. As described above, the insulation of the high voltage side connector wiring portion 49 and the metal substrates 17 and 18 and the heat dissipation base 53 is secured by the high voltage side insulation region portion 45.

  The high voltage side connector wiring portion 49 including the high voltage side connector terminal 35 and the inverter side connector terminal 36 is formed in the shape of "コ", and the high voltage side connector 23 of the power supply circuit portion 14 and the inverter of the power conversion circuit portion 15 Since the side connectors 28 are provided in the opposite direction, they can be connected to each other.

  Therefore, when the lid 12 is fixed to the ECU housing 11B, the high voltage side connector terminal 35 is connected by inserting it into the press fit type high voltage side connector 23, and the inverter side connector terminal 36 is TIG welded to the inverter side connector 28. Can be connected. At this time, the control circuit unit 16 is not provided, and the TIG welding torch can be easily brought close to the inverter-side connector terminal 36 and the inverter-side connector 28.

  Then, in the present embodiment, the connector 23 is formed by folding both ends of a single elongated metal plate inward, and further folding the folded area by two so that both end faces face each other. For this reason, the opposite end face is provided with elasticity, and the high voltage side connector terminal 35 pushed into this end face makes strong contact, and the pressing force given from the high voltage side connector terminal 35 is applied to the metal substrate 17 through the connector 23. It can be transmitted.

  In this embodiment, the metal substrate 17 is not fixed to the heat dissipation base 53 by the fixing screw, and the metal base 17 and the heat dissipation base 53 are fixed by the pressing force applied from the connector terminals inserted into the connectors 22 and 23. It is configured. Furthermore, a heat dissipating function material such as a heat dissipating sheet or heat dissipating grease is interposed between the metal substrate 17 and the heat dissipating base 53. Then, since the heat dissipating function material has elasticity, the pressing force from the high voltage side connector terminal 35 becomes a repulsive force and acts on the heat dissipating base 53 stably.

  In the present embodiment, the high voltage side insulating region portion 45 constituting the high voltage side connector wiring portion 49 is disposed outside the metal substrates 17 and 18 and the resin substrate 31, so the metal substrates 17 and 18 and the heat dissipation base Since the useless insertion portion is not formed on the inner peripheral side of 53, it is possible to obtain the effect that the cross-sectional area of the heat radiation passage can be sufficiently secured.

  Next, a cross section of the electric path-steering apparatus viewed from the D-D plane of FIG. 8 will be described based on FIG. 11, but the electric motor portion is also omitted in FIG.

  In FIG. 11, the power supply side connector wiring portion 50 connecting the external power supply and the power supply circuit portion 14 is embedded in the connector terminal forming portion 12A, and the power supply side connector terminal 34 at the tip of the power supply connector wiring portion 50 is It is exposed from the lid 12. The power supply side connector terminal 34 is connected to the power supply side connector 22 of the power supply circuit section 14, and simply by inserting the power supply side connector terminal 34 into the press fit type power supply side connector 22, soldering can be easily performed. The connection is complete.

  The power supply side connector 22 is also configured to fix the metal substrate 17 and the heat dissipation base 53 by the pressing force applied from the power supply side connector terminal 34 inserted. The opening directions of the opening 23A of the high voltage side connector 23 and the opening 22A of the power supply side connector 22 are disposed at an angle of 90 ° as shown in FIG. Therefore, even if the heat dissipation base 53 and the metal substrate 17 shift in the opening direction of the opening 22A of the power supply side connector 22, the opening 23A of the high voltage side connector 23 opens in the direction to block this. Deviation of the metal substrate 17 can be suppressed. Conversely, even if the heat dissipation base 53 and the metal substrate 17 shift in the opening direction of the opening 23A of the high voltage side connector 23, the opening 22A of the power supply side connector 22 opens in the direction to block this. And the displacement of the metal substrate 17 can be suppressed.

  Further, a low-pressure side insulating region portion 46 made of synthetic resin extends from the inner bottom surface portion of the lid 12 toward the control circuit portion 16 side. The low voltage side insulating region portion 46 extends to the control circuit portion 16 through the insertion portion 40 provided on the metal substrate 18, the insertion portion 41 provided on the metal substrate 17, and the insertion portion 42 provided on the heat dissipation base 53. . The metal substrates 17 and 18 and the insertion portions 40, 41 and 42 of the heat dissipation base 53 are formed between the outer peripheral surface of the metal substrates 17 and 18 and the side peripheral surface of the lid.

  The low voltage side connector wiring portion 51 is embedded in the low voltage side insulating region portion 46, and the low voltage side connector terminal 37 is formed on one side of the low voltage side connector wiring portion 51, and the control side connector terminal 38 is formed on the other side. Is formed. As described above, the insulation of the low voltage side connector wiring portion 51 with the metal substrates 17 and 18 and the heat dissipation base 53 is secured by the low voltage side insulation region portion 46.

  The low voltage side connector wiring portion 51 including the low voltage side connector terminal 37 and the control side connector terminal 38 is formed in a U shape, and the connection hole of the low voltage side connector 24 of the power supply circuit portion 14 and the control circuit portion 16 33E can be connected to each other. Therefore, when the lid 12 is to be fixed, the low voltage side connector terminal 37 is connected by inserting it into the low voltage side connector 24, and the control side connector terminal 38 is inserted into the connection hole 33 E of the resin substrate 31 of the control circuit portion 16. It can be connected by putting it on. At this time, the resin substrate 31 of the control circuit section 16 is fixed to the resin substrate mounting boss 29 by the fixing bolt 30, and in this state, the control side connector terminal 38 and the connection hole 33E can be joined by solder.

  The lid 12 is provided with an external connector terminal forming portion 12B for a detection sensor and an external connector terminal forming portion 12C for transmitting a control state. A signal transmission connector wiring portion (not shown) for transmitting signals of these terminal formation portions 12B and 12C is embedded in the lid 12, and the control side connector terminal 39 is exposed from the lid 12. The signal transmission connector wiring portion is embedded in the low voltage side insulating area portion 46 together with the low voltage side connector wiring portion 51 and is connected to the connection hole 33 E of the control circuit portion 16.

  In the present embodiment, the low voltage side insulating region portion 46 constituting the low voltage side connector wiring portion is disposed to be located on the outer peripheral side of the metal substrates 17 and 18 and the resin substrate 31. Since an unnecessary insertion portion is not formed on the inner peripheral side of the heat dissipation base 53, it is possible to obtain an effect that the heat dissipation passage cross-sectional area can be sufficiently secured.

  Further, as can be seen from the respective drawings, in this embodiment, the resin substrate 31 of the control circuit unit 16, the metal substrate 18 of the power conversion circuit unit 15, and the metal substrate 17 of the power supply circuit unit 14 are viewed in this order It is arranged. For this reason, the heat from the electric motor is blocked by the resin substrate 31 having a heat insulating property higher than that of the metal substrates 17 and 18. Therefore, the heat from the electric motor can be reduced.

  In the present embodiment, the fixing screw is omitted for the metal substrate 17 of the power supply circuit section 14 and the metal substrate 17 is pressed and fixed to the heat dissipation base 53 by the power connector terminal and the high voltage side connector terminal. It is also possible to press the output connectors 26U, 26V, 26W of the portion 15 against the metal substrate 18 by the bus bars and thereby press the metal substrate 18 against the heat dissipation base 53 and fix it. In addition, when the arrangement position of each connector is biased and the pressing force is unevenly distributed and can not be fixed well, it is possible to provide a simulated connector and a connector terminal and fix so that the pressing force is not unevenly distributed.

  As described above, in the present embodiment, the electronic control assembly includes the power supply circuit portion 14 mounted on the metal substrate 17 whose main function is the generation of a power supply, and the metal substrate 18 whose main function is the driving of the electric motor. By dividing the mounted power conversion circuit unit 15 and the control circuit unit 16 mounted on the resin substrate 31 whose main function is control of the power conversion circuit unit, the number of electrical components to be placed on each substrate can be reduced. Therefore, the radial size of each substrate can be reduced. Although the axial length is extended by the amount obtained by dividing the substrate into three, in the electric power steering apparatus, even if the axial length is slightly extended from the structural viewpoint, it is acceptable. The smaller the physical size, the greater the advantage over the entire product.

Further, without using fixing screws, the metal substrate of the power supply circuit unit or the power conversion circuit unit and the heat dissipation base are not connected with the connector of the power supply circuit unit or the power conversion circuit unit. The metal substrate of the circuit portion is pressed against the heat dissipation base and fixed.
Since the fixing screw for fixing the metal substrate to the heat dissipation base can be omitted, the area of the metal substrate can be reduced by the fixing screw for fixing the metal substrate to the heat dissipation base, and the power supply circuit portion and the power conversion circuit portion can be miniaturized. it can. Further, since the fixing screw for coupling the heat dissipation base and the metal substrate can be omitted, the number of parts can be reduced.

  Also, a connector terminal assembly including a connector wiring portion for supplying power from the power supply circuit portion 14 to the power conversion circuit portion 15 and the control circuit portion 16 and a connector wiring portion for transmitting input / output signals to the control circuit portion The power supply circuit unit, the power conversion circuit unit, and the corresponding connector terminals of the connector wiring portion for supplying high and low voltage power exposed from the connector terminal assembly and embedded in the connector terminal assembly. It is configured to be directly connected to the control circuit unit.

  Therefore, except for the wiring between the power conversion circuit unit 15 and the control circuit unit 16, each connector wiring unit is directly connected to the corresponding connector without using an extra relay connector part or the like. . Therefore, since no extra relay parts and the like are required, it is possible to reduce the number of parts and achieve miniaturization. Furthermore, since the configuration of the connector wiring portion is simple, it is possible to suppress an increase in the number of assembling steps and to suppress an increase in the unit price of the product.

  In addition, since the power supply circuit unit 14 using a large-sized electric component is housed in the housing space in which the relatively long seal area of the metal substrate 17 and the lid 12 exists, the storage space is effectively utilized. It is possible to shorten the axial length as much as possible.

  Furthermore, the power supply side connector terminal 34, the high voltage side connector terminal portion 35, the inverter side connector terminal portion 36, the low voltage side connector terminal portion 37, the control side connector terminal portion 38, and the control side connector terminal 39 It is disposed so as to be located closer to the outer peripheral side of the conversion circuit unit 15 and the control circuit unit 16. As a result, the electric components constituting the power supply circuit unit 14, the power conversion circuit unit 15 and the control circuit unit 16 can be disposed close to the centers of the respective substrates, so that miniaturization can be achieved in the radial direction. In addition, since the connector terminals are disposed on the outer side of the metal substrates 17 and 18, an unnecessary insertion portion is not formed on the inner peripheral side of the metal substrates 17 and 18, so that a heat radiation passage can be sufficiently secured.

  As described above, according to the present invention, the metal substrate of the power supply circuit or the power conversion circuit and the heat dissipation base are connected to the connector of the power supply circuit or the power conversion circuit without using fixing screws. The metal substrate of the power supply circuit unit or the power conversion circuit unit is pressed and fixed to the heat dissipation base by the terminal.

  According to this, since the fixing screw for fixing the metal substrate to the heat dissipation base can be omitted, the area of the metal substrate can be reduced by the fixing screw for fixing the metal substrate to the heat dissipation base. It can be miniaturized. Further, since the fixing screw for coupling the heat dissipation base and the metal substrate can be omitted, the number of parts can be reduced.

  The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

  DESCRIPTION OF SYMBOLS 6 ... Electric power steering apparatus, 11A ... Motor housing, 11B ... ECU housing, 12 ... Lid, 12A-12C ... Connector terminal part, 14 ... Power supply circuit part, 15 ... Power conversion circuit part, 16 ... Control circuit part, 17 18: metal substrate 19: capacitor 20: coil 21: switching element 22: power source side connector 23: high voltage side connector 24: low voltage side connector 25: switching element 26 U, 26 V, 26 W output connector , 27A, 27B, 27C, 27D: connector terminal, 28: inverter side connector, 34: power source side connector terminal, 35: high voltage side connector terminal, 36: inverter side connector, 37: low voltage side connector terminal, 38, 39: control Side connector terminal, 40 to 42 ... Insertion portion, 44 ... Fixing bolt, 45 ... High voltage side insulation area, 6 ... low voltage side insulation area part, 47, 48, 55 ... insertion part, 49 ... high voltage side connector wiring part, 50 ... power supply connector wiring part, 51 ... low voltage side connector wiring part, 53 ... heat dissipation base, 54 ... metal board mounting Screw part.

Claims (14)

An electric motor for driving a mechanical control element, and an electronic control unit disposed on the opposite side of the output shaft of the electric motor to control the electric motor, the electronic control unit containing the electric motor An electric drive comprising: an ECU housing coupled to the motor housing; and an electronic control assembly housed in the housing space of the ECU housing and the motor housing for driving and controlling the electric motor.
A power supply circuit portion or a power conversion circuit portion which arranges a metal heat dissipation base in thermal contact with the inner periphery of the ECU housing in the housing space of the ECU housing and the motor housing, and constitutes the electronic control assembly by the pressing force of the connector terminal to be connected to the arranged connector on a metal substrate, characterized in that securing against the power supply circuit section or the metal substrate of the power converter circuit unit to the heat dissipation base Electric drive. An electric motor for driving a mechanical control element, and an electronic control unit disposed on the opposite side of the output shaft of the electric motor to control the electric motor, the electronic control unit containing the electric motor An electric drive comprising: an ECU housing coupled to the motor housing; and an electronic control assembly housed in the housing space of the ECU housing and the motor housing for driving and controlling the electric motor.
The electronic control assembly includes: a power supply circuit unit mounted on a metal substrate whose main function is generation of a power supply; a power conversion circuit unit mounted on a metal substrate whose main function is driving the electric motor; Divided into a control circuit unit mounted on a resin substrate whose main function is control of the conversion circuit unit,
A metal heat dissipating substrate in thermal contact with the inner periphery of the ECU housing is disposed in the storage space, and the metal substrate of the power supply circuit portion and the power conversion circuit portion is fixed to both surfaces of the heat dissipating substrate. The heat from the power supply circuit unit and the power conversion circuit unit is dissipated to the ECU housing via the heat dissipation base,
The power supply circuit section or the power converter circuit unit, or with the metal substrate and the heat dissipation base of the said power supply circuit unit power converter circuit unit without the use of fixing screws, located on the metal substrate by the pressing force of the connector terminal that is connected to the connector, the electric drive unit, characterized in that securing against the metal substrate to the heat radiation substrate. In the electric drive device according to claim 1 or 2,
The electric motor is characterized in that the ECU housing and the heat dissipation base are integrally formed, or the ECU housing and the heat dissipation base are separately formed, and the space between them is thermally connected by a heat dissipation functional material. Drive device. In the electric drive unit according to claim 2,
A lid which doubles as a connector terminal assembly is provided at the opening of the ECU housing, and the power supply circuit portion is disposed in a space formed by the lid and the heat dissipation base, and the metal of the power supply circuit portion A substrate is fixed to one surface of the heat dissipation base so as to be able to transfer heat, the power conversion circuit section is disposed in a space formed by the heat dissipation base and the motor housing, and the metal substrate of the power conversion circuit section Electric drive is characterized in that heat transfer is fixed to the other surface of the heat dissipation base, and the control circuit is disposed in the space between the power conversion circuit and the electric motor of the motor housing. apparatus. In the electric drive unit according to claim 4,
The metal substrate of the power supply circuit unit includes a power supply side connector connected to an external power supply, a high voltage side connector for supplying a high voltage to the power conversion circuit unit, and a low voltage for supplying a low voltage to the control circuit unit. A side connector is disposed, and at least a power supply side connector terminal connected to the external power supply and connected to the power supply side connector provided on the lid, and the high voltage side connector connected to the power conversion circuit unit And a pressing force to the heat radiation base is applied to the metal substrate of the power supply circuit unit by a high voltage side connector terminal connected to the electric power source. In the electric drive unit according to claim 5,
The high-pressure connector of the power supply side connector and the power conversion circuit of the power supply circuit unit includes an electric drive unit which is a press-fit type connector. In the electric drive unit according to claim 6,
In the press-fit type connector, both ends of a single elongated metal plate are folded inward, and the folded area is further folded so that both opposing end faces have elasticity and are pressed into this end face The electric drive device according to claim 1, wherein each of the connector terminals is in contact with both of the end faces and transmits the pressing force applied from the respective connector terminals to the metal substrate. An electric motor for applying a steering assist force to a steering shaft, and an electronic control unit disposed on the opposite side of the output shaft of the electric motor to control the electric motor, the electronic control device includes the electric motor An electric power steering apparatus comprising: an ECU housing coupled to an accommodated motor housing; and an electronic control assembly accommodated in the housing space of the ECU housing and the motor housing for driving and controlling the electric motor.
A power supply circuit portion or a power conversion circuit portion which arranges a metal heat dissipation base in thermal contact with the inner periphery of the ECU housing in the housing space of the ECU housing and the motor housing, and constitutes the electronic control assembly by the pressing force of the connector terminal to be connected to the arranged connector on a metal substrate, characterized in that securing against the power supply circuit section or the metal substrate of the power converter circuit unit to the heat dissipation base Electric power steering device. An electric motor for applying a steering assist force to a steering shaft, and an electronic control unit disposed on the opposite side of the output shaft of the electric motor to control the electric motor, the electronic control device includes the electric motor An electric power steering apparatus comprising: an ECU housing coupled to an accommodated motor housing; and an electronic control assembly accommodated in the housing space of the ECU housing and the motor housing for driving and controlling the electric motor.
The electronic control assembly includes: a power supply circuit unit mounted on a metal substrate whose main function is generation of a power supply; a power conversion circuit unit mounted on a metal substrate whose main function is driving the electric motor; Divided into a control circuit unit mounted on a resin substrate whose main function is control of the conversion circuit unit,
A metal heat dissipating substrate in thermal contact with the inner periphery of the ECU housing is disposed in the storage space, and the metal substrate of the power supply circuit portion and the power conversion circuit portion is fixed to both surfaces of the heat dissipating substrate. The heat from the power supply circuit unit and the power conversion circuit unit is dissipated to the ECU housing via the heat dissipation base,
The power supply circuit section or the power converter circuit unit, or with the metal substrate and the heat dissipation base of the said power supply circuit unit power converter circuit unit without the use of fixing screws, located on the metal substrate by the pressing force of the connector terminal that is connected to the connector, the electric power steering apparatus characterized by securing against the metal substrate to the heat radiation substrate. The electric power steering apparatus according to claim 8 or 9,
The electric motor is characterized in that the ECU housing and the heat dissipation base are integrally formed, or the ECU housing and the heat dissipation base are separately formed, and the space between them is thermally connected by a heat dissipation functional material. Power steering device. In the electric power steering apparatus according to claim 9,
A lid which doubles as a connector terminal assembly is provided at the opening of the ECU housing, and the power supply circuit portion is disposed in a space formed by the lid and the heat dissipation base, and the metal of the power supply circuit portion A substrate is fixed to one surface of the heat dissipation base so as to be able to transfer heat, the power conversion circuit section is disposed in a space formed by the heat dissipation base and the motor housing, and the metal substrate of the power conversion circuit section Electric power is fixed to the other surface of the heat dissipation base so as to be able to transmit heat, and the control circuit is disposed in a space between the electric power conversion circuit and the electric motor of the motor housing. Steering device. In the electric power steering apparatus according to claim 11,
The metal substrate of the power supply circuit unit includes a power supply side connector connected to an external power supply, a high voltage side connector for supplying a high voltage to the power conversion circuit unit, and a low voltage for supplying a low voltage to the control circuit unit. A side connector is disposed, and at least a power supply side connector terminal connected to the external power supply and connected to the power supply side connector provided on the lid, and the high voltage side connector connected to the power conversion circuit unit An electric power steering apparatus characterized in that a pressing force to the heat dissipation base is applied to the metal substrate of the power supply circuit section by a high voltage side connector terminal connected to the power supply circuit section. In the electric power steering apparatus according to claim 12,
The high-pressure connector of the power supply side connector and the power conversion circuit of the power supply circuit unit, an electric power steering apparatus which is a press-fit type connector. The electric power steering apparatus according to claim 13.
In the press-fit type connector, both ends of a single elongated metal plate are folded inward, and the folded area is further folded so that both opposing end faces have elasticity and are pressed into this end face The electric power steering apparatus according to claim 1, wherein each of the connector terminals is in contact with both of the end surfaces to transmit a pressing force applied from the respective connector terminals to the metal substrate.

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