JP7085439B2 - Electric drive device and electric power steering device - Google Patents

Description

The present invention relates to an electric drive device and an electric power steering device, and more particularly to an electric drive device having a built-in electronic control unit and an electric power steering device.

In the general industrial machinery field, mechanical control elements are driven by electric motors, but recently, electronic control units including semiconductor elements that control the rotational speed and rotational torque of electric motors are electrically operated. So-called mechanical and electrical integrated electric drive devices that are integrated into motors are beginning to be adopted.

As an example of an electric drive device integrated with mechanical and electrical equipment, for example, in an electric power steering device of an automobile, the rotation direction and rotation torque of the steering shaft that is rotated by the driver operating the steering wheel are detected, and the rotation torque is detected. The electric motor is driven so as to rotate in the same direction as the rotation direction of the steering shaft based on the detected value, and the 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 device, for example, the one described in Japanese Patent Application Laid-Open No. 2016-144380 (Patent Document 1) is known. Patent Document 1 describes an electric power steering device including an electric motor unit and an electronic control unit. The electric motor of the electric motor unit is housed in a storage space formed in a motor housing having a tubular portion made of an aluminum alloy or the like, and the substrate on which the electronic components of the electronic control unit are mounted is the shaft of the motor housing. The end face wall portion on the opposite side of the output shaft in the direction is housed in a storage space formed by a synthetic resin or metal cover.

The substrate of the electronic control unit attached to the end face wall of the motor housing controls a MOSFET that drives and controls an electric motor, or a power conversion circuit unit having a power switching element such as an IGBT, a power supply circuit unit, and a power switching element. The output terminal of the power switching element and the input terminal of the electric motor are electrically connected to each other via a bus bar.

Here, the circuit board of the power supply circuit unit (hereinafter referred to as a power supply circuit board) constituting the electronic control unit and the circuit board of the control circuit unit (hereinafter referred to as a control circuit board) have a space of a predetermined length. The power supply circuit board and the control circuit board are electrically connected to each other by using elongated flat plate-shaped terminals. However, when such a flat plate-shaped terminal is used, there are problems that the configuration becomes complicated, the assembly work becomes complicated, and the entire apparatus becomes large.

For this reason, recently, a configuration has been proposed in which a laminated power supply circuit board and a control circuit board are electrically connected by using a flexible wiring board that can be bent. As a flexible wiring board, for example, a flexible printed wiring board is known. This flexible printed wiring board is a board in which an electric wiring circuit is formed on a base film in which a base film made of a thin and soft polyimide or the like having an insulating property and a conductive metal such as a copper foil are bonded.

As described above, since the flexible printed wiring board can be bent and the stacked power supply circuit board and the control circuit board can be electrically connected with a simple configuration, the assembly becomes easy and the size can be reduced.

In addition to this, as an electric drive device integrated with an electronic control unit, an electric brake, an electric hydraulic controller for various hydraulic control, and the like are known, but in the following description, the electric power steering device is represented. explain.

Japanese Unexamined Patent Publication No. 2016-144380

By the way, in the power supply circuit board and the control circuit board, in addition to the connection by the flexible printed wiring board, the power receiving plug-in connection terminal fixed to the board surface of the power supply circuit board and the control circuit board facing the board surface of the power supply circuit board. It is necessary to connect the power supply plug connection terminal of the power supply side connector fixed to the board surface.

For example, as shown in FIG. 16, when the power supply circuit board 50 and the control circuit board 51 are connected by the flexible printed wiring board 52, the power supply side connector 53 is fixed to the control circuit board 51 with a fixing screw or the like. ing. A power supply circuit that generates a power supply voltage for the control circuit unit and the power conversion circuit unit is mounted on the power supply circuit board 50, and therefore it is necessary to supply power to the power supply circuit.

Therefore, the power supply side connector 53 is fixed to the control circuit board 51, and the power supply plug-in connection terminal 54 for power supply protrudes from the power supply side connector 53 so as to be exposed. On the other hand, a cylindrical power receiving plug-in connection terminal 55 is fixed to the power supply circuit board 50 in order to receive electric power. Then, in the assembling step, power can be supplied to the power supply circuit unit by inserting and connecting the power supply plug connection terminal 54 to the cylindrical power receiving plug connection terminal 55.

By the way, in the assembly process, the power supply plug connection terminal 54 of the power supply side connector 53 fixed to the control circuit board 51 to which the flexible printed wiring board 52 is connected is plugged into the power receiving plug connection terminal 55 of the power supply circuit board 50. In the case of connection, since there is a flexible printed wiring board 52, it is not possible to move the power supply plug connection terminal 54 of the power supply side connector 53 fixed to the control circuit board 51 in the vertical direction and plug it in. Therefore, the assembly machine moves the power feeding plug-in connection terminal 54 from diagonally above with the side of the flexible printed wiring board 52 as the center of rotation so as to draw an arc, and the plug-in connection is performed.

Therefore, the tubular power receiving plug-in connection terminal 55 and the power supply plug-in connection terminal 54 inevitably interfere with each other, and the power supply plug-in connection terminal 54 may be satisfactorily plugged and connected to the cylindrical power-receiving plug-in connection terminal 55. It raises the issue of not being able to do it. It should be noted that this problem is not limited to the power supply plug-in connection terminal for power supply and the power receiving plug-in connection terminal, and the same applies to the connection terminals of other circuit boards.

An object of the present invention is an electronic control unit in which a first circuit board and a second circuit board are connected by a flexible printed wiring board, and an insertion connection terminal fixed to the first circuit board is inserted into a second circuit board. It is an object of the present invention to provide a new electric drive device and an electric power steering device that can be well connected to a connection terminal.

The first feature of the present invention is an electronic control unit in which a first circuit board and a second circuit board are connected by a flexible printed wiring board, and a plug-in connection terminal fixed to the first circuit board is a flexible printed wiring. A tubular first plug-in connection terminal having an opening on the opposite side of the board is used, and a second plug-in connection terminal fixed to the second circuit board passes through the opening of the first plug-in connection terminal. 1 It is located where it is plugged and connected to the plug-in connection terminal.

The second feature of the present invention is an electronic control unit in which a first circuit board and a second circuit board are connected by a flexible printed wiring board, and a plug-in connection terminal fixed to the first circuit board is a flexible printed wiring. The second plug-in connection terminal fixed to the second circuit board is the first plug-in connection terminal, which is a tubular first plug-in connection terminal inclined in the direction away from the first circuit board toward the side opposite to the board. It is provided with an inclined portion along the shape of the first plug-in connection terminal in a state of being plugged and connected to.

According to the present invention, in the electronic control unit in which the first circuit board and the second circuit board are connected by a flexible printed wiring board, the plug-in connection terminal of the second circuit board is connected to the plug-in connection terminal fixed to the first circuit board. Can be connected smoothly and well.

It is an overall perspective view of the steering apparatus as an example to which this invention is applied. It is an exploded perspective view of the electric power steering apparatus shown in FIG. It is a perspective view of the motor housing shown in FIG. FIG. 3 is a cross-sectional view taken along the axis of the motor housing shown in FIG. It is a perspective view which shows the state which the power conversion circuit part was placed and fixed in the motor housing shown in FIG. It is a perspective view which shows the state which the power supply circuit part was placed and fixed in the motor housing shown in FIG. It is a perspective view which shows the state which the control circuit part was placed and fixed in the motor housing shown in FIG. FIG. 3 is a perspective view showing a state in which the connector terminal assembly is placed and fixed on the motor housing shown in FIG. 7. It is explanatory drawing which shows the state in which the power supply circuit board and the control circuit board which become 1st Embodiment of this invention are electrically connected. 9 is a cross-sectional view showing a cross section taken along the line AA of the plug-in connection terminal portion shown in FIG. It is sectional drawing which shows the modification of the plug-in connection terminal part shown in FIG. It is an explanatory part which shows the state which the power supply circuit board and the control circuit board are electrically connected, which becomes the 2nd Embodiment of this invention. It is sectional drawing which shows the BB cross section of the plug-in connection terminal part shown in FIG. FIG. 3 is a cross-sectional view of an embodiment in which the connection terminal portion of FIG. 10 is coated with a resin. 11 is a cross-sectional view of an embodiment in which the connection terminal portion of FIG. 11 is coated with a resin. It is explanatory drawing explaining the state which electrically connects a conventional power supply circuit board and a control circuit board.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiments, and various modifications and applications are included in the technical concept of the present invention. Also included in the scope thereof. Before explaining the embodiment of the present invention, the configuration of the steering device as an example to which the present invention is applied and the basic configuration of the electric power steering device will be described with reference to FIGS. 1 to 8. I will explain briefly.

First, a steering device for steering the front wheels of an automobile will be described. The steering device 1 is configured as shown in FIG. A pinion 3 is provided at the lower end of a steering shaft 2 connected to a steering wheel (not shown), and the pinion 3 meshes with a rack shaft long in the left-right direction of the vehicle body. Tie rods 5 for steering the front wheels in the left-right direction are connected to both ends of the rack shaft, and the rack shaft is covered with the rack housing 4. A rubber boot 6 is provided between the rack housing 4 and the tie rod 5.

An electric power steering device 7 is provided to assist the torque when rotating the steering wheel. That is, a torque sensor 8 and a steering angle sensor 9 for detecting the rotation direction and the rotation torque of the steering shaft 2 are provided, and steering assistance is provided to the rack shaft via the reduction gear portion 10 based on the detection value of the torque sensor 8. An electric motor unit 11 that applies force and an electronic control unit 12 that controls the electric motor and are arranged adjacent to the electric motor unit 11 are provided. Further, the electric motor portion 11 of the electric power steering device 7 is connected to the reduction gear portion 10 via bolts (not shown) at three locations on the outer peripheral portion on the output shaft side, and is on the side opposite to the output shaft of the electric motor 11 portion. An electronic control unit 12 is provided.

In the electric power steering device 7, when the steering shaft 2 is rotated in either direction by operating the steering wheel, the torque sensor 8 determines the rotation direction and rotation torque of the steering shaft 2. It is detected, and the control circuit unit of the electronic control unit 12 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 drive operation amount, and the output shaft of the electric motor is rotated so as to be driven in the same direction as the operation direction of the steering shaft 2. The rotation of the output shaft is transmitted from a pinion (not shown) to the rack shaft via the reduction gear portion 10, and the automobile is steered. Since these configurations and actions are already well known, further description thereof will be omitted.

FIG. 2 shows the electric power steering device 7. The electric power steering device 7 has a different configuration of the electronic control unit 12 of the electric power steering device 7 shown in FIG. 1, but has the same function. ..

Next, the configuration of the electric power steering device will be briefly described with reference to FIGS. 2 to 8. However, the electric power steering devices shown in FIGS. 2 to 8 do not show the features of the present invention, but are for roughly explaining the configuration of the electric power steering device.

FIG. 2 is a drawing in which the components of the electric power steering device are disassembled and viewed from an oblique direction, and FIGS. 3 to 8 are drawings showing a state in which the components are assembled according to the assembly order of the components. Is. Therefore, in the following description, the description will be given with reference to each drawing as appropriate.

FIG. 2 shows an exploded perspective view of the electric power steering device 7. As shown in FIG. 2, the electric motor portion 11 constituting the electric power steering device is a motor housing 13 having a tubular portion made of an aluminum-based metal such as aluminum or an aluminum alloy, and an electric motor unit (not shown) housed therein. The electronic control unit 12 is composed of a motor and is made of aluminum, an aluminum metal such as an aluminum alloy, or an iron metal arranged on the side opposite to the axial output shaft of the motor housing 13. It is composed of a metal cover 14 and an electronic control unit EC housed therein.

The motor housing 13 and the metal cover 14 are integrally fixed by crimping and fixing or bolting in a fixing region portion in the outer peripheral direction formed on the facing end faces thereof. The electronic control unit EC housed inside the metal cover 14 has a power supply circuit unit that generates a necessary power source, a MOSFET that drives and controls the electric motor of the electric motor unit 11, or a power switching element including an IGBT or the like. It consists of a conversion circuit and a control circuit unit that controls the power switching element, and the output terminal of the power switching element and the coil input terminal of the electric motor are electrically connected via a bus bar.

The connector terminal assembly 19 is exposed from a hole formed in the metal cover 14 on the end surface of the metal cover 14 on the opposite side of the motor housing 13. The metal cover 14 is formed so as to cover all of the electronic control unit EC fixed to the end face side of the motor housing 13 and a part of the connector terminal assembly 19 that connects the electronic control unit EC to an external device. The control unit EC is mechanically and electrically protected.

The connector terminal assembly 19 is a resin connector made of synthetic resin, and the connector terminal assembly 19 and the metal cover 14 are liquidtightly engaged in an assembled state. For example, the two are pressure-welded and engaged via a seal ring made of silicon, whereby a liquid-tight structure can be ensured. Alternatively, liquid tightness can be ensured by forming a groove on the surface of the connector terminal assembly 13 for accommodating the end face of the metal cover, filling the groove with a liquid sealant, and accommodating the end face of the metal cover.

Further, the connector terminal assembly 19 is fixed to the fixing portion formed in the motor housing 13 by a fixing screw. The connector terminal assembly 19 includes a connector terminal forming portion for power supply, a connector terminal forming portion for a detection sensor, and a connector terminal forming portion for transmitting a control state to an external device.

The electronic control unit EC housed in the metal cover 14 is supplied with power from a power source via a connector terminal forming unit for power supply made of synthetic resin, and detects an operating state or the like from detection sensors. The signal is supplied via the connector terminal forming portion for the detection sensor, and the control state signal of the current electric power steering device is transmitted through the connector terminal forming portion for transmitting the control state.

An annular iron side yoke (not shown) is fitted inside the motor housing 13, and an electric motor (not shown) is housed in the side yoke. The output unit of the electric motor applies steering assist force to the rack via gears. Since the specific structure of the electric motor is well known, the description thereof is omitted here.

The motor housing 13 is made of an aluminum alloy, and functions as a heat sink member that releases heat generated by an electric motor and heat generated by a power supply circuit unit and a power conversion circuit unit, which will be described later, to the outside atmosphere. The electric motor unit 11 is composed of the electric motor and the motor housing 13.

An electronic control unit EC is attached to an end face portion 15 of the motor housing 13 on the opposite side of the output portion of the electric motor unit 11. The electronic control unit EC includes a power conversion circuit unit 16, a power supply circuit unit 17, a control circuit unit 18, and a connector terminal assembly 19. The end face portion 15 of the motor housing 13 is integrally formed with the motor housing 13, but in addition to this, only the end face portion 15 may be formed separately and integrated with the motor housing 13 by screws or welding.

Here, the power conversion circuit unit 16, the power conversion circuit unit 17, and the control circuit unit 18 form a redundant system, and form a dual system of a first electronic control unit and a second electronic control unit. Normally, the electric motor is controlled and driven by the first electronic control unit, but when an abnormality or failure occurs in the first electronic control unit, the motor is switched to the second electronic control unit to control and drive the electric motor. To. In addition, the first electronic control unit and the second electronic control unit are combined to function as a regular electronic control unit, and if an abnormality or failure occurs in one electronic control unit, the other electronic control unit has half the capacity of the electric motor. It is also possible to control and drive. In this case, the capacity of the electric motor is halved, but the so-called "power steering function" is secured.

The electronic control unit EC is composed of a power conversion circuit unit 16, a power supply circuit unit 17, a control circuit unit 18, and a connector terminal assembly 19, and the power conversion circuit unit 16 and a power supply are provided in a direction away from the end face portion 15 side. The circuit unit 17, the control circuit unit 18, and the connector terminal assembly 19 are arranged in this order.

The control circuit unit 18 generates a control signal for driving the switching element of the power conversion circuit unit 16, and is composed of a microcomputer, peripheral circuits, and the like. The power supply circuit unit 17 generates a power supply for driving the control circuit unit 18 and a power supply for the power conversion circuit unit 16, and is composed of a capacitor, a coil, a switching element, and the like. The power conversion circuit unit 16 adjusts the power flowing through the coil of the electric motor, and is composed of switching elements and the like that form the three-phase upper and lower arms.

A connector terminal assembly 19 made of synthetic resin is provided between the control circuit unit 18 and the metal cover 14, and is connected to a vehicle battery (power supply) or an external other control device (not shown). Of course, it goes without saying that the connector terminal assembly 19 is electrically connected to the power conversion circuit unit 16, the power supply circuit unit 17, and the control circuit unit 18.

The metal cover 14 has a function of accommodating a power conversion circuit unit 16, a power supply circuit unit 17, and a control circuit unit 18 and sealing them in a liquid-tight manner. In the present embodiment, the metal cover 14 is crimped and fixed. Is fixed to the motor housing 13.

Next, the configuration and assembly method of each component will be described with reference to FIGS. 3 to 8. First, FIG. 3 shows the appearance of the motor housing 13, and FIG. 4 shows the axial cross section thereof.

In FIGS. 3 and 4, the motor housing 13 is formed in a cylindrical shape and closes the side peripheral surface portion 13A, the end surface portion 15 that closes one end of the side peripheral surface portion 13A, and the other end of the side peripheral surface portion 13A. It is composed of an end face portion 37. In the present embodiment, the motor housing 13 has a bottomed cylindrical shape, and the side peripheral surface portion 13A and the end surface portion 15 are integrally formed. Further, the end surface portion 37 has a function of a lid, and after the electric motor is housed in the side peripheral surface portion 13A, the other end of the side peripheral surface portion 13A is closed.

Further, an annular groove portion (hereinafter referred to as a motor housing side annular groove portion) 35 is provided on the entire peripheral surface of the end surface portion 15, and the opening of the metal cover 14 shown in FIG. 8 is provided in the motor housing side annular groove portion 35. The end (hereinafter referred to as the annular tip on the metal cover side) is stored. The portion between the annular groove portion on the motor housing side and the annular tip portion on the metal cover side of the metal cover 14 is liquidtightly joined by a so-called liquid sealant.

As shown in FIG. 4, a stator 21 in which a coil 20 is wound around an iron core is fitted inside the side peripheral surface portion 13A of the motor housing 13, and a permanent magnet is embedded inside the stator 21. The rotor 22 is rotatably housed. A rotation shaft 23 is fixed to the rotor 22, one end of which is an output unit 38, and the other end of which is a rotation detection unit 24 for detecting the rotation phase and rotation speed of the rotation shaft 23. A permanent magnet is provided in the rotation detection unit 24, and penetrates through the through hole 25 provided in the end face portion 15 and protrudes to the outside. Then, the rotation phase and the rotation speed of the rotation shaft 23 are detected by a magnetic sensing portion composed of a GMR element or the like (not shown).

Returning to FIG. 3, the power conversion circuit unit 16 and the heat radiation units 15A and 15B of the power supply circuit unit 17 are formed on the surface of the end surface portion 15 located on the opposite side of the rotation shaft 23 from the output portion 38. A substrate / connector fixing convex portion 26 is integrally planted at the four corners of the end face portion 15, and a screw hole 26S is formed inside.

The board / connector fixing convex portion 26 is provided for fixing the board of the control circuit unit 18 described later and the connector terminal assembly 19. Further, in the substrate / connector fixed convex portion 26 planted from the power conversion heat dissipation region 15A described later, a substrate receiving portion 27 having the same axial height as the power supply heat dissipation region 15B described later is formed on the substrate. A screw hole 27S is formed in the receiving portion 27. The substrate receiving portion 27 is for mounting and fixing a power supply circuit board 31 made of a glass epoxy board constituting the power supply circuit portion 17, which will be described later.

The radial plane region orthogonal to the rotation axis 23 forming the end face portion 15 is divided into two. One forms a power conversion heat dissipation region 15A to which a power conversion circuit unit 16 composed of a switching element such as a MOSFET is attached, and the other forms a power supply heat dissipation region 15B to which a power supply circuit unit 17 is attached. In the present embodiment, the power conversion heat dissipation region 15A has a larger area than the power supply heat dissipation region 15B. This is because the dual system is adopted as described above, so that the installation area of the power conversion circuit unit 16 is secured.

The power conversion heat dissipation region 15A and the power supply heat dissipation region 15B have steps having different heights in the axial direction (direction in which the rotating shaft 23 extends). That is, the power supply heat dissipation region 15B is formed with a step in the direction away from the power conversion heat dissipation region 15A when viewed in the direction of the rotating shaft 23 of the electric motor. This step is set to a length at which the power conversion circuit unit 16 and the power supply circuit unit 17 do not interfere with each other when the power supply circuit unit 17 is installed after the power conversion circuit unit 16 is installed.

In the power conversion heat dissipation region 15A, three elongated rectangular protruding heat radiation portions 28 are formed. The protruding heat radiating unit 28 is provided with a dual power conversion circuit unit 16 described later. Further, the protruding heat radiating portion 28 projects and extends in a direction away from the electric motor when viewed in the direction of the rotating shaft 23 of the electric motor.

Further, the power dissipation region 15B is flat, and a power supply circuit unit 17, which will be described later, is installed. Therefore, the protruding heat radiating unit 28 functions as a heat radiating unit that transfers the heat generated by the power conversion circuit unit 16 to the end face portion 15, and the power supply radiating region 15B transfers the heat generated by the power supply circuit unit 17 to the end face portion 15. It functions as a heat radiating part that transfers heat.

Next, FIG. 5 shows a state in which the power conversion circuit unit 16 is installed in the ridge heat dissipation unit 28 (see FIG. 3). As shown in FIG. 5, a power conversion circuit unit 16 composed of a dual system is installed above the protruding heat radiating unit 28 (see FIG. 3) formed in the power conversion heat radiating region 15A. The switching element constituting the power conversion circuit unit 16 is mounted on a metal substrate (here, an aluminum-based metal is used), and is configured to easily dissipate heat. The metal substrate is welded to the protruding heat radiating portion 28 by friction stir welding.

Therefore, the metal substrate is firmly fixed to the protruding heat radiating portion 28 (see FIG. 3), and the heat generated by the switching element can be efficiently transferred to the protruding heat radiating portion 28 (see FIG. 3). The heat transferred to the protruding heat radiating portion 28 (see FIG. 3) is diffused to the power conversion radiating region 15A, and further transferred to the side peripheral surface portion 13A of the motor housing 13 to be radiated to the outside. Here, as described above, the height of the power conversion circuit unit 16 in the axial direction is lower than the height of the power supply heat dissipation region 15B, so that the power conversion circuit unit 16 does not interfere with the power supply circuit unit 17, which will be described later.

As described above, the power conversion circuit unit 16 is installed above the protruding heat radiating unit 28 formed in the power conversion heat radiating region 15A. Therefore, the heat generated by the switching element of the power conversion circuit unit 16 can be efficiently transferred to the protruding heat radiating unit 28. Further, the heat transferred to the protruding heat radiating portion 28 is diffused to the power conversion heat radiating region 15A, transferred to the side peripheral surface portion 13A of the motor housing 13, and radiated to the outside.

Next, FIG. 6 shows a state in which the power supply circuit unit 17 is installed from above the power conversion circuit unit 16. As shown in FIG. 6, a power supply circuit unit 17 is installed above the power dissipation region 15B. The capacitor 29, the coil 30, and the like constituting the power supply circuit unit 17 are mounted on the power supply circuit board 31 made of a glass epoxy board. A dual system is also adopted for the power supply circuit unit 17, and as can be seen from the figure, a power supply circuit composed of a capacitor 29, a coil 30, and the like is formed symmetrically. An electric element such as a capacitor other than the switching element of the power conversion circuit 16 is mounted on the power supply circuit board 31.

The surface of the power supply circuit board 31 on the power supply heat dissipation region 15B (see FIG. 5) side is fixed to the end face portion 15 so as to be in contact with the power supply heat dissipation region 15B. As shown in FIG. 6, the fixing method is fixed by a fixing screw (not shown) in the screw hole 27S provided in the board receiving portion 27 of the board / connector fixing convex portion 26. Further, it is also fixed to a screw hole 27S provided in the power dissipation region 15B (see FIG. 5) by a fixing screw (not shown).

Since the power supply circuit unit 17 is formed of the power supply circuit board 31, double-sided mounting is possible. A rotation phase and rotation speed detection unit including a GMR element (not shown) and a detection circuit thereof are mounted on the surface of the power supply circuit board 31 on the power dissipation region 15B (see FIG. 5) side, and the rotation shaft 23 (see FIG. 5). In cooperation with the rotation detection unit 24 (see FIG. 4) provided in (see FIG. 4), the rotation phase and the number of rotations are detected.

In this way, since the power supply circuit board 31 is fixed so as to be in contact with the power supply heat dissipation area 15B (see FIG. 5), the heat generated in the power supply circuit unit 17 is efficiently transferred to the power supply heat dissipation area 15B (FIG. 5). Can be heat-transferred to (see). The heat transferred to the power supply heat dissipation region 15B (see FIG. 5) is diffused to the side peripheral surface portion 13A of the motor housing 13 and transferred to the outside to be dissipated to the outside. Here, by interposing any one of an adhesive having good heat transfer, a heat-dissipating grease, and a heat-dissipating sheet between the power supply circuit board 31 and the heat-dissipating region 15B for power supply (see FIG. 5), the heat transfer performance is further improved. Can be improved.

As described above, the power supply circuit unit 17 is installed above the power dissipation region 15B. The surface of the power supply circuit board 31 on which the circuit element of the power supply circuit unit 17 is mounted on the power supply heat dissipation region 15B side is fixed to the end surface portion 15 so as to be in contact with the power supply heat dissipation region 15B. Therefore, the heat generated in the power supply circuit unit 17 can be efficiently transferred to the power dissipation region 15B. The heat transferred to the power supply heat dissipation region 15B is diffused to the side peripheral surface portion 13A of the motor housing 13 and transferred to the outside to be dissipated to the outside.

Next, FIG. 7 shows a state in which the control circuit unit 18 is installed from above the power supply circuit unit 17. As shown in FIG. 7, a control circuit unit 18 is installed above the power supply circuit unit 17. The microcomputer 32 and the peripheral circuit 33 constituting the control circuit unit 18 are mounted on the control circuit board 34 made of a glass epoxy board. A dual system is also adopted for the control circuit unit 18, and as can be seen from the figure, a control circuit composed of a microcomputer 32 and a peripheral circuit 33 is formed symmetrically with each other. The microcomputer 32 and the peripheral circuit 33 may be provided on the surface of the control circuit board 34 on the power supply circuit 17 side.

As shown in FIG. 7, the control circuit board 34 is a fixing screw (not shown) sandwiched by a connector terminal assembly 13 in a screw hole 26S provided at the top of a board / connector fixing convex portion 26 (see FIG. 6). Between the power supply circuit board 31 of the power supply circuit unit 17 (see FIG. 6) and the control circuit board 34 of the control circuit unit 18, a connector 29, a coil 30 and the like of the power supply circuit unit 17 shown in FIG. It is a space to be placed.

The power supply circuit board 31 of the power supply circuit unit 17 and the control circuit board 34 of the control circuit unit 18 are electrically connected by a flexible wiring board 39 that can be bent. As a wiring board having flexibility, for example, a flexible printed wiring board 39 is known. The flexible printed wiring board 39 is a board in which an electric wiring circuit is formed on a base film in which a base film made of a thin and soft polyimide or the like having an insulating property and a conductive metal such as a copper foil are bonded. Since the flexible printed wiring board 39 can be bent and the stacked power supply circuit board 31 and the control circuit board 34 can be electrically connected with a simple configuration, assembly becomes easy and miniaturization can be achieved.

Next, FIG. 8 shows a state in which the connector terminal assembly 19 is installed from above the control circuit unit 18. As shown in FIG. 8, a connector terminal assembly 19 is installed above the control source circuit unit 18. The connector terminal assembly 19 is fixed by the fixing screw 36 so as to sandwich the control circuit portion 18 in the screw hole provided at the top of the board / connector fixing convex portion 26. In this state, the connector terminal assembly 19 is connected to the power conversion circuit unit 16, the power supply circuit unit 17, and the control circuit unit 18.

Further, after this, the metal cover side annular tip portion of the metal cover 14 is housed in the motor housing side annular groove portion 35 of the motor housing 13, and is fixed by a crimping fixing portion provided along the outer peripheral direction of the metal cover 14.

In the electric power steering device described above, in the power supply circuit board 31 and the control circuit board 34, in addition to the connection of the flexible printed wiring board 39, the power receiving plug-in connection terminal fixed to the board surface of the power supply circuit board 31 It is necessary to connect the power supply plug-in connection terminal of the power supply side connector fixed to the board surface of the control circuit board 34 facing the board surface of the power supply circuit board 31.

Therefore, when the power supply circuit board 31 and the control circuit board 34 are connected by the flexible printed wiring board 39, the connector terminal assembly 19 is fixed to the control circuit board 34 with a fixing screw, unlike the above-described configuration. .. Then, a through hole is formed on the substrate surface of the control circuit board 34, and the plug-in connection terminal for power supply for power supply of the connector terminal assembly 19 is projected from the through hole so as to be exposed.

On the other hand, a cylindrical power receiving plug-in connection terminal is fixed to the power supply circuit board 31 in order to receive electric power. Then, in the assembling process, power can be supplied to the power supply circuit unit by inserting and connecting the power supply plug-in connection terminal to the cylindrical power-receiving plug-in connection terminal.

However, in the assembly process, when the power supply plug-in connection terminal of the connector terminal assembly 19 fixed to the control circuit board 34 is inserted into the power-receiving plug-in connection terminal of the power supply circuit board 31 and connected, flexible printing is performed by the assembling machine. Since the power supply plug-in connection terminal is moved in an arc from diagonally above with the wiring board 39 as the center of rotation, the cylindrical power-receiving plug-in connection terminal and the power supply plug-in connection terminal inevitably interfere with each other. There arises a problem that the power supply plug-in connection terminal cannot be satisfactorily plugged and connected to the cylindrical power receiving plug-in connection terminal.

Against this background, the present invention proposes an electric power steering device having the following configuration.

In the first embodiment of the present invention, the power supply circuit board and the control circuit board are connected by a flexible printed wiring board, and the power receiving plug-in connection terminal fixed to the power supply circuit board is a flexible printed circuit board. A tubular power receiving plug-in connection terminal with an opening on the opposite side of the wiring board, and a power supply plug-in connection terminal fixed to the control circuit board passes through the power receiving plug-in connection terminal opening to become a power-receiving plug-in connection terminal. It is configured to be plugged in.

Next, a specific configuration of the electric power steering device according to the first embodiment of the present invention will be described in detail with reference to FIGS. 9 to 11.

Here, in FIG. 9, the power supply circuit board 31 and the control circuit board 34 omit the display of the electronic parts and the electric parts constituting the power supply circuit unit 17 and the control circuit unit 18, and the power supply circuit board 31 is used. Only the power receiving plug-in connection terminal 40 that supplies power to the mounted power supply circuit and the power supply plug-in connection terminal 41 that supplies power from the vehicle battery (power supply) are displayed.

The power supply circuit board 31 and the control circuit board 34 are connected by a flexible printed wiring board 39, and the flexible printed wiring board 39 is curved while the power supply circuit board 31 and the control circuit board 34 are arranged in parallel. It bends and supplies a power supply voltage from the power supply circuit 17 to the control circuit 18.

Further, the connector terminal assembly 19 is integrally fixed to the control circuit board 34 by a fixing screw (not shown). Therefore, in the following, the connector terminal assembly 19 is also included in the control circuit board 34. Although not shown in the connector terminal assembly 19, it is configured to be fixed to the motor housing 13 side by a fixing screw 36 as shown in FIG. 8 in the final assembly process.

A through hole 42 is formed in a part of the control circuit board 34, and the connector terminal assembly 19 is integrally fixed to the control circuit board 34, and the power feeding plug-in connection terminal 41 is the control circuit base. It protrudes from the plate through hole 42 of 34 in a form exposed. The power supply plug-in connection terminals 41 are provided in pairs (two), and are connected to the positive electrode and the negative electrode of the vehicle battery (power supply), respectively.

A power receiving plug-in connection terminal 40 is provided on the board surface of the power supply circuit board 31 facing the board surface of the control circuit board 34 where the power supply plug-in connection terminal 41 is located. When assembled in a normal state, the power feeding plug connection terminal 40 and the power receiving plug connection terminal 41 are arranged at positions where they are coupled to each other.

Here, the two power receiving plug-in connection terminals 40 and the two power supply plug-in connection terminals 41 are arranged in order on the same straight line toward the flexible printed wiring board 39, and the two power receiving plug-in terminals are arranged in order. The distance between the connection terminals 40 is set to a length that does not interfere with the arc-shaped locus Trj to which the power feeding plug-in connection terminal 41 moves when the control circuit board 34 is assembled. Here, the locus Trj means the locus of the intermediate point of the tip of the power feeding plug-in connection terminal 41.

When arranging the two power receiving plug-in connection terminals 40 and the two power supply plug-in connection terminals 41 on a straight line orthogonal to the straight line toward the flexible printed wiring board 39, consideration for such interference is necessary. Instead, they can be arranged side by side on a straight line orthogonal to the straight line toward the flexible printed wiring board 39.

As shown in FIGS. 9 and 10, the power receiving plug-in connection terminal 40 has a cross section parallel to the power supply circuit board 31 formed into an elongated rectangular cylinder along the direction of a straight line toward the flexible printed wiring board 39. Has been done. Moreover, it has an opening 40C formed by cutting out the wall surface on the side opposite to the flexible printed wiring board 39, and two wall surfaces 40A along the direction of a straight line toward the flexible printed wiring board 39 and the wall surface 40A. It is formed from a wall surface 40B which is connected to and orthogonal to the wall surface 40B. Therefore, the power receiving plug-in connection terminal 40 has a cross section parallel to the power supply circuit board 31 formed in a “U” shape.

A storage space 43 for the power supply plug connection terminal 41 is formed by the two wall surfaces 40A and the wall surface 40B, and the power supply plug connection terminal 41 is stored in the storage space 43. Since the distance between the two wall surfaces 40A is set to be slightly shorter than the width of the power supply plug connection terminal 41, the power supply plug connection terminal 41 is elastically held when it is stored in the storage space 43. ..

The tip of the power supply plug connection terminal 41 on the flexible printed wiring board 39 side has a chamfered portion 44 at a corner when viewed in a cross section parallel to the power supply circuit board 31, and is formed on the power receiving plug connection terminal 40. It is designed so that it can smoothly enter the opened opening 40C. As a result, it is possible to reduce the possibility that the power feeding plug connection terminal 41 is caught in the opening 40C formed in the power receiving plug connection terminal 40.

Then, as shown in FIG. 9, in the assembly process, the power supply plug-in connection terminal 41 of the connector terminal assembly 19 fixed to the control circuit board 34 is inserted into the power receiving plug-in connection terminal 40 of the power supply circuit board 31 for connection. In this case, the assembly machine moves the power supply plug-in connection terminal 41 in an arc with the flexible printed wiring board 39 as the center of rotation.

In this case, the power supply plug connection terminal 41 passes through the opening 40C of the power receiving plug connection terminal 40, so that the power receiving plug connection terminal 40 does not interfere with the power receiving plug connection terminal 40 as in the conventional case. You can enter the storage space 43. According to this, the power supply plug-in connection terminal 41 of the control circuit board can be smoothly and satisfactorily connected to the power receiving plug-in connection terminal 40 fixed to the power supply circuit board 31.

Next, a modification of the first embodiment will be described with reference to FIG. In the embodiment shown in FIG. 10, the cross-sectional shape parallel to the power supply circuit board 31 is a "U" shape including two wall surfaces 40A and wall surfaces 40B connected to and orthogonal to the two wall surfaces 40A.

On the other hand, in the modified example, as shown in FIG. 11, the power receiving plug-in connection terminal 40 has a cross section parallel to the power supply circuit board 31 and has an elongated passage shape along the direction of a straight line toward the flexible printed wiring board 39. Is formed in. Therefore, it has a wall surface on the opposite side of the flexible printed wiring board 39 and openings 40C and 40D formed by cutting out the wall surface facing the wall surface, and is in the direction of a straight line toward the flexible printed wiring board 39. It is formed from two wall surfaces 40A along the line. Therefore, the power receiving plug-in connection terminal 40 has a cross section parallel to the power supply circuit board 31 formed in a passage shape.

A storage space 43 for the power supply plug connection terminal 41 is formed on the two wall surfaces 40A, and the power supply plug connection terminal 41 is stored in the storage space 43. Since the distance between the two wall surfaces 40A is set to be slightly shorter than the width of the power feeding plug connection terminal 41, the power feeding plug connection terminal 41 is elastically held when it is stored in the storage space 43. According to this, since only two wall surfaces 40A are formed, the configuration becomes simple.

Further, in the opening 40C on the opposite side of the flexible printed wiring board 39, an expansion portion 45 that expands in an arc shape toward the outside is formed. Therefore, the chamfered portion 44 and the expanding portion 45 of the power feeding plug connection terminal 41 can smoothly enter the power feeding plug connection terminal 41 into the opening 40C formed in the power receiving plug connection terminal 40, and the power feeding plug connection terminal 41 can be smoothly inserted. However, it is possible to reduce the risk of being caught in the opening 40C formed in the power receiving plug-in connection terminal 40.

Next, the electric power steering device according to the second embodiment of the present invention will be described.

In the second embodiment of the present invention, the power supply circuit board and the control circuit board are connected by a flexible printed wiring board, and the power receiving plug-in connection terminal fixed to the power supply circuit board is a flexible printed circuit board. It is a tubular power receiving plug-in connection terminal that is inclined toward the opposite side of the wiring board. The configuration is such that it is formed in an inclined shape along the shape of the power receiving plug-in connection terminal.

A specific configuration of the electric power steering device according to the second embodiment will be described in detail with reference to FIGS. 12 to 13.

Here, also in FIG. 12, the power supply circuit board 31 and the control circuit board 34 omit the display of the electronic parts and the electric parts constituting the power supply circuit unit 17 and the control circuit unit 18, and the power supply circuit board 31 is used. Only the power receiving plug-in connection terminal 46 that supplies power to the mounted power supply circuit and the power supply plug-in connection terminal 47 that supplies power from the vehicle battery (power supply) are displayed.

The power supply circuit board 31 and the control circuit board 34 are connected by a flexible printed wiring board 39, and the flexible printed wiring board 39 is curved while the power supply circuit board 31 and the control circuit board 34 are arranged in parallel. It bends and supplies a power supply voltage from the power supply circuit 17 to the control circuit 18.

Further, as in the first embodiment, the connector terminal assembly 19 is integrally fixed to the control circuit board 34 by a fixing screw (not shown). Although not shown in the connector terminal assembly 19, it is configured to be fixed to the motor housing 13 side by a fixing screw 36 as shown in FIG. 8 in the final assembly process.

A through hole 42 is formed in a part of the control circuit board 34, and the power feeding plug-in connection terminal 47 is inserted from the through hole 42 in a state where the connector terminal assembly 19 is integrally fixed to the control circuit board 34. It is projected in an exposed form. The power supply plug-in connection terminals 47 are provided in pairs (two), and are connected to the positive electrode and the negative electrode of the vehicle battery (power supply), respectively.

A power receiving plug-in connection terminal 46 is provided on the board surface of the power supply circuit board 31 facing the board surface of the control circuit board 34 where the power supply plug-in connection terminal 47 is located. When assembled in the normal state, the power feeding plug connection terminal 46 and the power receiving plug connection terminal 47 are arranged at positions where they are coupled to each other.

Here, as in the first embodiment, the two power receiving plug-in connection terminals 46 and the two power supply plug-in connection terminals 47 are arranged in order on the same straight line toward the flexible printed wiring board 39. The distance between the two power receiving plug-in connection terminals 46 is set to a length that does not interfere with the arc-shaped locus Trj to which the power supply plug-in connection terminal 47 moves when the control circuit board 34 is assembled.

When arranging the two power receiving plug-in connection terminals 46 and the two power supply plug-in connection terminals 47 on a straight line orthogonal to the straight line toward the flexible printed wiring board 39, such consideration is not necessary. It can be arranged side by side on a straight line orthogonal to the straight line toward the flexible printed wiring board 39.

As shown in FIG. 12, the power receiving plug-in connection terminal 46 fixed to the power supply circuit board 31 is a power source on the opposite side of the flexible printed wiring board 39 when viewed in the direction of a straight line toward the flexible printed wiring board 39. It is a tubular power receiving plug-in connection terminal 46 that is inclined by a predetermined angle toward the direction away from the circuit board 31. Further, a storage space 48 is formed in the power receiving plug-in connection terminal 46, and the storage space 48 is also inclined by a predetermined angle following the power receiving plug-in connection terminal 46.

The tilt angle of the power receiving plug-in connection terminal 46 and the storage space 48 is set to the tilt angle along the arcuate locus Trj in which the power supply plug-in connection terminal 47 moves when the control circuit board 34 is assembled. Here, too, the locus Trj means the locus of the midpoint of the tip of the power feeding plug-in connection terminal 41.

Along with this, an inclined portion 47A is also formed on the tip end side of the power feeding plug connection terminal 47 of the connector terminal assembly 19 fixed to the control circuit board 34, and the inclined power receiving plug connection terminal 46 is formed. The entire inclined portion 47A is stored in the storage space 48 formed in the above. The inclined portion 47A of the power feeding plug-in connection terminal 47 is viewed from the middle of the power feeding plug-in connection terminal 47 toward the flexible printed wiring board 39 when viewed in the direction of a straight line toward the flexible printed wiring board 39. It is tilted by the tilt angle.

This tilt angle is set to a tilt angle that matches the tilt of the storage space 48 of the power receiving plug-in connection terminal 46 when the power supply plug-in connection terminal 47 is connected to the power-receiving plug-in connection terminal 46 at a regular position. .. Therefore, when the control circuit board 34 is assembled, even if the power supply plug connection terminal 47 moves along the arcuate locus Trj to which the power supply plug connection terminal 47 moves, the power supply plug connection terminal 47 does not interfere with the power reception plug connection terminal 46. , Can be plugged into and connected to the storage space 48. In this case, the shape of the storage space 48 of the power receiving plug-in connection terminal 48 is formed according to the movement locus of the power supply plug-in connection terminal 47.

The power receiving plug-in connection terminal 46 has a cross section parallel to the power supply circuit board 31 formed into an elongated rectangular cylinder along the direction of a straight line toward the flexible printed wiring board 39. The power receiving plug-in connection terminal 46 is formed of two wall surfaces 46A along the direction of a straight line toward the flexible printed wiring board 39, and wall surfaces 46B and 46C connected to and orthogonal to the wall surface 46A.

A storage space 48 for the inclined portion 47A of the power feeding plug connection terminal 47 is formed by the four wall surfaces 46A to 46C, and the power feeding plug connection terminal 47 is stored in this storage space 48. Since the distance between the two wall surfaces 46A is formed to be slightly shorter than the width of the power supply plug connection terminal 47, the power supply plug connection terminal 47 is elastically held when it is stored in the storage space 48. ..

The tip of the inclined portion 47A of the power feeding plug connection terminal 47 is chamfered at the corner area on the wall surface 46A side forming the storage space 48, and is smoothly inserted into the opening of the storage space 48 formed in the power receiving plug connection terminal 46. It is said that it is possible to enter. As a result, it is possible to reduce the possibility that the inclined portion 47A of the power feeding plug connection terminal 47 is caught in the opening formed in the storage space 48 of the power receiving plug connection terminal 46.

Then, as shown in FIG. 12, in the assembly process, the power supply plug-in connection terminal 47 of the connector terminal assembly 19 fixed to the control circuit board 34 is inserted into the power receiving plug-in connection terminal 46 of the power supply circuit board 31 for connection. In this case, the assembly machine moves the power supply insertion connection terminal 47 from diagonally above with the side of the flexible printed wiring board 39 as the center of rotation so as to draw an arc.

In this case, the power supply plug connection terminal 47 of the power receiving plug connection terminal 46 does not interfere with the power receiving plug connection terminal 46 as in the conventional case due to the opening of the storage space 48 of the power receiving plug connection terminal 46. You can enter the storage space 48. According to this, the power supply plug-in connection terminal 47 of the control circuit board 34 can be smoothly and satisfactorily connected to the power receiving plug-in connection terminal 46 fixed to the power supply circuit board 31.

Here, in the present embodiment, the shape of the storage space 48 and the power feeding plug connection terminal 47 can be formed in an arc shape according to the locus Trj, and this arc shape is also a concept of “inclination”. It is included.

Further, as shown in FIGS. 14 and 15, a coating film 49 made of an electrically insulating synthetic resin may be formed around the outside of the power receiving plug-in connection terminal 46. In this way, by forming the coating film 49 made of the electrically insulating protective resin on the outer peripheral surface of the power receiving insertion terminal, deterioration of the terminal material can be prevented, and deterioration of the terminal material can be prevented, and the contact with other conductors or the like can prevent the deterioration of the terminal material. The risk of electrical short circuit can be reduced. In this embodiment, the power receiving plug-in connection terminal 46 may be arranged so as to partially exist in the resin coating as long as the contact with the power supply plug-in connection terminal 47 is maintained.

In the above-described embodiment, the power supply plug connection terminal and the power receiving plug connection terminal for supplying power to the power supply circuit unit are shown, but the present invention is not limited to the power supply plug connection terminal and the power receiving plug connection terminal. The same can be applied to connection terminals of circuit boards other than the above.

As described above, according to the present invention, the first circuit board and the second circuit board are electronic control units connected by a flexible printed wiring board, and the plug-in connection terminal fixed to the first circuit board is flexible. A tubular first plug-in connection terminal having an opening on the side opposite to the printed wiring board and a surface facing the second circuit board, and a second plug-in connection terminal fixed to the second circuit board. Is configured to be plugged and connected to the first plug-in connection terminal through the opening of the first plug-in connection terminal.

Further, according to the present invention, the first circuit board and the second circuit board are an electronic control unit connected by a flexible printed wiring board, and the plug-in connection terminal fixed to the first circuit board is a flexible printed wiring board. It is a tubular first plug-in connection terminal that is inclined in a direction away from the first circuit board toward the opposite side, and the second plug-in connection terminal fixed to the second circuit board becomes the first plug-in connection terminal. In the state of being plugged and connected, the configuration is such that an inclined portion along the shape of the first plug-in connection terminal is provided.

According to this, in the electronic control unit in which the first circuit board and the second circuit board are connected by the flexible printed wiring board, the plug-in connection terminal of the second circuit board is attached to the plug-in connection terminal fixed to the first circuit board. The connection can be made smoothly and well.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

7 ... Electric power steering device, 13 ... Electric motor unit, 12 ... Electronic control unit, 13 ... Motor housing, 14 ... Metal cover, 15 ... End face part, 15A ... Power conversion heat dissipation area, 15B ... Power supply heat dissipation area, 16 ... Power conversion circuit unit, 17 ... Power supply circuit unit, 18 ... Control circuit unit, 19 ... Connector terminal assembly, 31 ... Power supply circuit board, 34 ... Control circuit board, 39 ... Flexible printed wiring board, 40 ... Power receiving plug-in connection Terminal, 41 ... Power supply plug connection terminal, 42 ... Through hole, 43 ... Storage space, 46 ... Power receiving plug connection terminal, 47 ... Power supply plug connection terminal, 47A ... Inclined part, 48 ... Storage space.

Claims (11)

The electric motor for driving the mechanical control element, the motor housing in which the electric motor is housed, and the end face wall portion of the motor housing on the side opposite to the output portion of the rotation shaft of the electric motor are arranged. An electric drive device including an electronic control unit for driving the electric motor.
The electronic control unit includes at least a first circuit board and a second circuit board, and the first circuit board and the second circuit board are connected by a flexible printed wiring board.
The plug-in connection terminal fixed to the first circuit board is a tubular first plug-in connection terminal having an opening on the surface facing the second circuit board and the side opposite to the flexible printed wiring board. ,
An electric drive device characterized in that a second plug-in connection terminal fixed to the second circuit board is plugged and connected to the first plug-in connection terminal through the opening of the first plug-in connection terminal. .. In the electric drive device according to claim 1,
The first circuit board is a power supply circuit board, the first plug-in connection terminal is a power receiving plug-in connection terminal, the second circuit board is a control circuit board, and the second plug-in connection terminal is a power supply plug-in connection terminal. The power supply circuit board and the control circuit board are electrically connected by the flexible printed wiring board, and are also connected.
The power receiving plug-in terminal fixed to the power supply circuit board has a tubular opening having an opening on a surface facing the second circuit board and an opening on the side opposite to the flexible printed wiring board. The connection terminal is characterized in that the power supply plug connection terminal fixed to the control circuit board is plugged and connected to the power receiving plug connection terminal through the opening of the power receiving plug connection terminal. Electric drive device. In the electric drive device according to claim 2,
The power supply plug-in connection terminal is provided in the connector terminal assembly connected to the power supply side.
The connector terminal assembly is an electric drive device fixed to the control circuit board, and the power feeding plug-in connection terminal is exposed and protrudes from a through hole formed in the control circuit board. The electric motor for driving the mechanical control element, the motor housing in which the electric motor is housed, and the end face wall portion of the motor housing on the side opposite to the output portion of the rotation shaft of the electric motor are arranged. An electric drive device including an electronic control unit for driving the electric motor.
The electronic control unit includes at least a first circuit board and a second circuit board, and the first circuit board and the second circuit board are connected by a flexible printed wiring board.
The plug-in connection terminal fixed to the first circuit board is a cylindrical first plug-in connection terminal inclined in a direction away from the first circuit board toward the side opposite to the flexible printed wiring board.
The second plug-in connection terminal fixed to the second circuit board is characterized by having an inclined portion along the shape of the first plug-in connection terminal in a state of being plugged and connected to the first plug-in connection terminal. Electric drive device. In the electric drive device according to claim 4,
The first circuit board is a power supply circuit board, the first plug-in connection terminal is a power receiving plug-in connection terminal, the second circuit board is a control circuit board, and the second plug-in connection terminal is a power supply plug-in connection terminal. The power supply circuit board and the control circuit board are electrically connected by the flexible printed wiring board, and are also connected.
An electric drive device characterized in that the inclined portion of the power feeding plug-in connection terminal fixed to the control circuit board is inclined from the middle of the power feeding plug-in connection terminal. In the electric drive device according to claim 5,
The power supply plug-in connection terminal is provided in the connector terminal assembly connected to the power supply side.
The connector terminal assembly is an electric drive device fixed to the control circuit board, and the power feeding plug-in connection terminal is exposed and protrudes from a through hole formed in the control circuit board. An electric motor that applies steering assist force to the steering shaft based on the output from the torque sensor that detects the rotation direction and rotation torque of the steering shaft, the motor housing in which the electric motor is housed, and the rotation of the electric motor. An electronic control unit for driving the electric motor, which is arranged on the end face wall side of the motor housing on the side opposite to the output unit of the shaft, and
An electric power steering device including a cover that covers the electronic control unit.
The electronic control unit has a power supply circuit unit whose main function is to generate a power source, a power conversion circuit unit whose main function is to drive an electric motor, and a control circuit unit whose main function is to control the power conversion circuit unit. Consists of and
At least, the power supply circuit board constituting the power supply circuit unit and the control circuit board constituting the control circuit unit are electrically connected by a flexible printed wiring board and are also connected.
The power receiving plug-in connection terminal fixed to the power supply circuit board has a tubular plug-in connection terminal having an opening on the side facing the control circuit board and the side opposite to the flexible printed wiring board. The electric power steering is characterized in that the power supply plug connection terminal fixed to the control circuit board is plugged and connected to the power receiving plug connection terminal through the opening of the power receiving plug connection terminal. Device. In the electric power steering device according to claim 7.
The power supply plug-in connection terminal is provided in the connector terminal assembly connected to the power supply side.
The connector terminal assembly is an electric power steering device fixed to the control circuit board, and the power feeding plug-in connection terminal is exposed and protrudes from a through hole formed in the control circuit board. An electric motor that applies steering assist force to the steering shaft based on the output from the torque sensor that detects the rotation direction and rotation torque of the steering shaft, the motor housing in which the electric motor is housed, and the rotation of the electric motor. Electric power steering provided with an electronic control unit for driving the electric motor and a cover covering the electronic control unit, which are arranged on the end face wall side of the motor housing on the side opposite to the output unit of the shaft. It ’s a device,
The electronic control unit has a power supply circuit unit whose main function is to generate a power source, a power conversion circuit unit whose main function is to drive an electric motor, and a control circuit unit whose main function is to control the power conversion circuit unit. Consists of and
At least, the power supply circuit board constituting the power supply circuit unit and the control circuit board constituting the control circuit unit are electrically connected by a flexible printed wiring board and are also connected.
The plug-in connection terminal fixed to the power supply circuit board is a cylindrical power receiving plug-in connection terminal inclined in a direction away from the power supply circuit board toward the side opposite to the flexible printed wiring board.
The power supply plug-in connection terminal fixed to the control circuit board is characterized by having an inclined portion along the shape of the power-receiving plug-in connection terminal in a state of being plugged and connected to the power-receiving plug-in connection terminal. Electric power steering device. In the electric power steering apparatus according to claim 9,
An electric power steering device characterized in that the inclined portion of the power feeding plug-in connection terminal fixed to the control circuit board is inclined from the middle of the power feeding plug-in connection terminal. In the electric power steering apparatus according to claim 9,
The power supply plug-in connection terminal is provided in the connector terminal assembly connected to the power supply side.
The connector terminal assembly is an electric power steering device fixed to the control circuit board, and the power feeding plug-in connection terminal is exposed and protrudes from a through hole formed in the control circuit board.

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