JP7384709B2 - Electric power steering device and manufacturing method - Google Patents

Description

The present invention relates to an electric power steering device and a manufacturing method.

2. Description of the Related Art Conventionally, there has been known a technology related to an electric power steering device that is provided by integrating an electric motor that drives a steering mechanism of a vehicle and a circuit for controlling the electric motor. For example, Patent Document 1 discloses a novel electric power steering system that suppresses the radial enlargement of the housing in which the electronic control device is housed, reduces the number of parts such as relay connectors as much as possible, and has a simple heat dissipation structure. Disclose the device. This electric power steering device includes a power supply circuit section mounted on a metal substrate, a power conversion circuit section mounted on a metal substrate, and a control circuit section mounted on a resin substrate. A connector terminal assembly made of synthetic resin includes a power supply connector wiring section that supplies power from the power supply circuit section to the power conversion circuit section and the control circuit section, and a signal transmission connector wiring section that transmits input/output signals to the control circuit section. The connector terminals of the power supply connector wiring section and the signal transmission connector wiring section exposed from the connector terminal assembly are embedded in the connector terminal assembly and placed on the outer circumferential side of the metal substrate. Connected directly to the connector on the

Moreover, Patent Document 2 discloses an electric power steering device that can suppress wiring space in a configuration including a plurality of boards. In this electric power steering device, the connector has a terminal connected to the first board or the second board, and is provided on the opposite side of the motor section with the board in between. In the first substrate, there are two or more non-overlapping regions that do not overlap with the second substrate when projected in the axial direction of the motor section. At least one of the non-overlapping areas is a connector connection area connected to a connector terminal, and at least one of the non-overlapping areas other than the connector connection area is a motor connected to a winding set for each phase. This is the motor line connection area connected to the line. Thereby, the wiring space can be suppressed.

Japanese Patent Application Publication No. 2016-144382 Japanese Patent Application Publication No. 2017-189034

As described above, electric power steering devices are required to be as compact as possible because they are installed in the engine room of a vehicle. On the other hand, electric power steering devices require high heat dissipation because they house electronic components that generate a large amount of heat, and they are also required to reduce manufacturing costs by improving assembly ease during manufacturing. There is. However, in the above-mentioned conventional technology, the heat sink is located in the middle of the device, so it cannot be said that the heat dissipation is good, and no special measures are taken when assembling the multiple boards in the control unit or the control unit and the electric motor. Not yet.

The present invention was devised in view of the above circumstances, and provides an electric power steering device having good heat dissipation and good assemblability due to modularization, and a method for manufacturing the same.

In order to solve the above problems, an electric power steering device includes a motor housing that houses an electric motor that drives a steering mechanism for a vehicle, and a control unit that is disposed on the opposite side of the output shaft of the electric motor. The housing is electrically connected to the electric motor and includes a motor connection terminal extending toward a control unit, and the control unit is disposed at a position furthest from the electric motor and has a plurality of terminals for connecting to an external cable. A connector assembly with a connector formed thereon, a heat sink cover that is equipped with the connector assembly and fixed to the motor housing, and a drive electronic component for driving the electric motor, and the side opposite to the side on which the drive electronic components are mounted. The drive board is placed with the surface facing the heat sink cover side, and the power supply electronic components for generating power for the drive board are mounted, and the surface on which the power supply electronic components are mounted is facing the drive board side, and the output axis direction is a power supply board disposed closer to the electric motor than the drive board; a receiving part for receiving the drive electronic components and the power supply electronic parts; and a holding part for holding the drive board and the power supply board at a predetermined distance; It is equipped with a board holding member placed between them, a rotation sensor for detecting the rotation of the output shaft, and a control unit for controlling the drive electronic components, with the surface on which the rotation sensor is mounted facing the electric motor side. An electric power steering device is provided, which includes: a control board disposed closer to the electric motor than the power supply board in the output shaft direction;
According to this, a heat sink is provided at the end of the device near the drive board that generates a large amount of heat, the heat sink is placed in direct contact with the outside air, and a board holding member is provided between the boards in the control unit. As a result, it is possible to provide an electric power steering device having good heat dissipation properties and good assemblability due to modularization.

Furthermore, the board holding member has a holding member connection terminal that is connected to the motor connection terminal, and when the motor connection terminal is pushed into the holding member connection terminal to assemble the control unit and the motor housing, the drive board and the power supply board are connected. It may be characterized by having a function of maintaining a predetermined distance.
According to this, ease of assembly can be improved by having a function of maintaining a predetermined distance between the drive board and the power supply board when pushing in the terminals to assemble the control unit and the electric motor.

Furthermore, the drive board has a power drive terminal that electrically connects the power board, and the board holding member has a function of guiding the power drive terminal when assembling the power board and the drive board. Good too.
According to this, when assembling a plurality of boards in the control unit, ease of assembly can be improved by having the function of guiding the terminals that electrically connect the boards.

Furthermore, one end of the holding part may be fixed to a surface of the power supply board on which the power supply electronic components are mounted, and the other end of the holding part may be fixed to a surface of the drive board on which the drive electronic components are mounted.
According to this, with such a board holding member, it is not necessary to provide a support for fixing the power supply board on the heat sink cover, and the area of the drive board can be increased.

Furthermore, the connector assembly includes a power terminal for connecting the power cable connected to the connector assembly and the power supply board, and a control terminal for connecting the control cable and the control board connected to the connector assembly. It may be characterized in that it is arranged radially outward of the output shaft from the power supply terminal.
According to this, by adopting such an arrangement, there is no need to provide an opening in the power supply board to avoid interference with the control terminal, and it becomes easy to route the pattern wiring on the power supply board.

Further, the substrate holding member may include a holding member fixing portion for fixing the control board to the outside of the holding portion in the radial direction of the output shaft, and the control board may be fixed to the holding member fixing portion.
According to this, by fixing the control board to the board holding member, better assemblability can be obtained through modularization.

Furthermore, the heat sink cover may include a cover fixing part for fixing the control board to the outside of the holding part in the radial direction of the output shaft, and the control board may be fixed to the cover fixing part.
According to this, by fixing the control board to the heat sink cover, it is possible to minimize the positional deviation between the sensor that detects the rotation of the output shaft and the central axis of the output shaft.

Furthermore, the electric motor has two windings that function as a redundant system, and the plurality of connectors of the connector assembly, the control board, the drive board, and the power board have a redundant system corresponding to the redundant system of the electric motor. may be a feature.
According to this, it is possible to provide a compact electric power steering device even if it has a redundant system and a large number of parts.

In order to solve the above problems, a manufacturing method for manufacturing a control unit disposed on the opposite side of the output shaft of the electric motor in an electric power steering device including an electric motor that drives a steering mechanism for a vehicle, comprising: The control unit is equipped with a heat sink cover fixed to a motor housing that houses the electric motor, and drive electronic components for driving the electric motor, with the surface opposite to the surface on which the drive electronic components are mounted facing the heat sink cover side. A drive board is mounted facing the drive board, and a power supply electronic component for generating power for the drive board is mounted, with the side on which the power supply electronic components are mounted facing the drive board side, and the side closer to the electric motor than the drive board in the output shaft direction. A board disposed between the drive board and the power supply board, the board having a receiving part that receives the drive electronic components and the power supply electronic components, and a holding part that holds the drive board and the power supply board at a predetermined distance. It is equipped with a holding member, a rotation sensor for detecting the rotation of the output shaft, and a control unit for controlling the drive electronic components, and the power supply board is mounted in the direction of the output shaft, with the surface on which the rotation sensor is mounted facing the electric motor side. a control board disposed closer to the electric motor; the drive electronic component is fitted into the receiving part; the drive board and the board holding member are fixed; and the drive board is driven on the surface opposite to the surface on which the board holding member is fixed. Fix the board to the heat sink cover, fit the power supply electronic components into the receiving part, fix the power supply board to the side of the board holding member opposite to the side on which the drive board is fixed, and insert the control board from the fixed power supply board side. A manufacturing method for fixing to a heat sink cover is provided.
According to this, a heat sink is provided at the end of the device near the drive board that generates a large amount of heat, the heat sink is placed in direct contact with the outside air, and a board holding member is provided between the boards in the control unit. Thus, it is possible to provide a method for manufacturing an electric power steering device that has good heat dissipation properties and good assemblability due to modularization.

As described above, according to the present invention, it is possible to provide an electric power steering device having good heat dissipation and ease of assembly, and a method for manufacturing the same.

(A) Plan view, (B) Right side view, (C) Front view, (D) Perspective view from above, (E) Perspective view from below of the electric power steering device according to the first embodiment of the present invention. figure. (A) A plan view, (B) A cross-sectional view taken along the line BB in (A), and (C) A cross-sectional view taken along the line A-A in (A) of the electric power steering device according to the first embodiment of the present invention. . FIG. 1A is an exploded perspective view from above, and FIG. 3B is an exploded perspective view from below, of an electric power steering device according to a first embodiment of the present invention. (A) A plan view, (B) a right side view, (C) a front view, and (D) a perspective view from above of a drive board of an electric power steering device according to a first embodiment of the present invention. (A) Top view, (B) right side view, (C) front view, (D) bottom view, and (E) top view of the board holding member of the electric power steering device according to the first embodiment of the present invention. Perspective view. (A) Top view, (B) right side view, (C) front view, (D) bottom view, and (E) perspective view from above of the power supply board of the electric power steering device according to the first embodiment of the present invention figure. (A) Top view, (B) right side view, (C) front view, (D) bottom view, and (E) perspective view from above of the control board of the electric power steering device according to the first embodiment of the present invention. figure. In the electric power steering device of the first embodiment of the present invention, (A) top view, (B) right side view, (C) front view, and (D) when the drive board and the board holding member are fixed. Bottom view, (E) perspective view from above. In the electric power steering device of the first embodiment of the present invention, (A) top view, (B) right side view, (C) front view, and (D) top view when fixed from the heat sink cover to the power supply board. A perspective view from. In the electric power steering device of the first embodiment of the present invention, (A) top view, (B) right side view, (C) front view, and (D) top view when everything from the heat sink cover to the control board is fixed. A perspective view from. In the electric power steering device according to the first embodiment of the present invention, when the heat sink cover is fixed to the control board, (A) a plan view, (B) a sectional view taken along the EE cross section in (A), and (C ) A sectional view taken along the line FF in (A). In an electric power steering device according to a modification of the first embodiment of the present invention, (A) a plan view, (B) a right side view, (C) a front view, ( D) Perspective view from above. FIG. 3 is a schematic diagram showing the relationship between a substrate holding member and another substrate in an electric power steering device according to a modification of the first embodiment of the present invention. FIG. 1 is a functional block diagram of an electric power steering device according to an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.
<First example>
An electric power steering device 1 in this embodiment will be described with reference to FIGS. 1 to 14. The electric power steering device 1 includes a motor housing 200 that accommodates an electric motor MT that drives a vehicle steering mechanism, and a control unit 100 that is disposed on the opposite side of the output shaft RT that is the rotor of the electric motor MT. . The electric motor MT generates assist steering torque to the steering mechanism in order to assist the driver of the vehicle with torque when rotating the steering wheel. Control unit 100 is a control device for controlling electric motor MT that generates assist steering torque.

In the electric power steering device 1 in this embodiment, as shown in FIG. 14, the electric motor MT is composed of a first electric motor MTA and a second electric motor MTB, and the control unit 100 is composed of a first control system 100A and a second control system. It consists of 100B. The electric power steering device 1 as a whole includes a first system 10A consisting of a first electric motor MTA and a first control system 100A, and a second system 10B consisting of a second electric motor MTB and a second control system 100B. Consisting of In this way, since each of the two systems is redundant, even if an abnormality occurs in either system, control as the electric power steering device 1 can be continued. In this embodiment, the first electric motor MTA and the second electric motor MTB have a redundant system because the windings are composed of a first winding set and a second winding set, and the rotors are shared. ing. However, the present invention is not limited thereto, and the first electric motor MTA and the second electric motor MTB may be two separate electric motors.

As shown in FIGS. 1 and 14, the first control system 100A/second control system 100B connects a power source electronic component 151 that constitutes a power source section on a power source board 150 from a vehicle battery via a power cable and a power connector 1111. to supply power. The power connector 1111 is connected to a power terminal 112 formed on the substrate side of the connector assembly 110. In addition, the first control system 100A/second control system 100B configures a control unit on the control board 160 via a CAN connector 1112 that is connected to a CAN (Car Area Network, not shown) via a control cable. A vehicle speed signal is supplied to the microcomputer 162 that Further, the first control system 100A/second control system 100B supplies a steering torque signal, a steering angle signal, etc. to the microcomputer 162 via a sensor connector 1113 connected to a sensor that detects information on various parts of the vehicle.

The sensor connector 1113 is connected to a control terminal 113 formed on the substrate side of the connector assembly 110. The control terminal 113 is arranged radially outward of the output shaft RT from the power supply terminal 112. In this way, by arranging the control terminal 113 connected to the control board 160 located far away from the power supply terminal 112 connected to the power supply board 150 located close to the outside in the radial direction. There is no need to provide an opening in the power supply board 150 to avoid interference with the control terminals 113, and pattern wiring can be easily routed in the power supply board 150.

The driver IC, which is the drive electronic component 131 on the drive board 130, receives a control signal from the microcomputer 162 on the control board 160 and drive power from the power supply section on the power supply board 150, and connects each motor connection terminal 210. The first electric motor MTA and the second electric motor MTB are driven through the motor. An MR sensor 161 (Magnetic Resistance sensor) that detects the rotational position of the rotor of the first electric motor MTA/second electric motor MTB is provided on the control board 160 and inputs the detected motor rotation angle signal to the microcomputer 162. . In this way, the connectors 111 such as the power connector 1111 and the CAN connector 1112, the control board 160, the drive board 130, and the power board 150 have redundant systems corresponding to the first electric motor MTA and the second electric motor MTB, respectively. As shown in FIG. 1(A), the control unit 100 is divided into a first control system 100A and a second control system 100B above and below a center line CT connecting the center of the sensor connector 1113 and the rotation axis of the electric motor MT. It is located. Even in the case where there is a redundant system and a large number of parts, by arranging it in this manner, it is possible to provide a compact electric power steering device 1.

Motor housing 200 includes a motor connection terminal 210 that is electrically connected to electric motor MT. Motor connection terminal 210 extends toward control unit 100, is electrically connected to the board, and transmits a drive current for driving electric motor MT. Since the electric motor MT has three phases, the motor connection terminals 210 form a set of three terminals, and as shown in FIG. 2(B), two terminals correspond to the first control system 100A and the second control system 100B, respectively. Consists of pairs.

As shown in FIG. 3, the control unit 100 includes a connector assembly 110, a heat sink cover 120, a drive board 130, a board holding member 140, a power supply board 150, and a control board 160 in order from the motor housing 200 housing the electric motor MT. Be prepared. The connector assembly 110 is disposed at the farthest position from the motor housing 200 that accommodates the electric motor MT, and has a plurality of connectors 111 formed therein for connection to external cables such as a battery, CAN, and sensor. The connector 111 includes a power connector 1111, a CAN connector 1112, and a sensor connector 1113 corresponding to external cables. The heat sink cover 120 mounts the connector assembly 110 on about 2/3 of its upper surface, is fixed to the motor housing 200, and radiates heat generated by the plurality of boards on the remaining upper surface and side surfaces. The drive board 130, which generates a particularly large amount of heat, is placed in contact with the heat sink cover 120. Note that, since the heat sink cover 120 is separated from the motor housing 200, it is not easily affected by the heat generated by the electric motor MT itself.

In order to drive the electric motor MT, the drive board 130 includes a pre-driver that generates a PWM signal from the control signal of the microcomputer 162, and a pre-driver that generates a PWM signal from the control signal of the microcomputer 162, and a pre-driver that generates a first winding set and a second winding set of the three-phase electric motor MT using the PWM signal. It is equipped with drive electronic components 131 including a bridge circuit composed of switching elements to be driven, a shunt resistor for detecting the current of each phase of the bridge circuit, and the like. Note that the drive electronic component 131 may be a driver IC in which multiple functions and circuits are integrated into one component, or may be mounted on the drive board 130 as individual components or circuits. Further, as shown in FIG. 4, the drive board 130 has a power drive terminal 132 that is electrically connected to the power supply board 150. A part of the power drive terminals 132 transmits a drive current from the power supply board 150, and the other part transmits a control signal from the control board 160 via the power supply board 150. The drive board 130 is arranged with the surface on which these drive electronic components 131 are mounted facing the power supply board 150 (substrate holding member 140), and the surface opposite to this surface facing the heat sink cover 120 side. The substrate of the drive board 130 is preferably made of metal (particularly aluminum) in order to easily conduct heat to the heat sink cover 120.

The power supply board 150 mounts a power supply electronic component 151 for generating power to the drive board 130, as shown in FIG. The power supply electronic component 151 constitutes a power supply section for converting the power from the battery obtained through the power supply connector 1111 into a power supply suitable for the electric motor MT and the microcomputer 162 on the control board 160. Further, the power supply board 150 has a power supply control terminal 152 electrically connected to the control board 160 on the surface opposite to the surface on which the power supply electronic component 151 is mounted. A portion of the power supply control terminal 152 transmits a control signal from the drive board 130 to the control board 160 via the power supply board 150, or transmits a signal from the control board 160 to the drive board 130. Moreover, the power supply board 150 has a power supply terminal connection hole 153 connected to the power supply terminal 112 at the end. The power supply board 150 is arranged closer to the electric motor MT than the drive board 130 in the axial direction of the output shaft RT, with the surface on which the power supply electronic component 151 is mounted facing the drive board 130 side.

As shown in FIG. 5, the board holding member 140 has a receiving portion 1421 on one surface for receiving the drive electronic component 131 protruding from the drive board 130, and a receiving portion 1421 for receiving the drive electronic component 131 protruding from the power supply board 150 on the other surface. 151 has a receptacle 1422 for receiving. The board holding member 140 has a receiving part 1421 for receiving the drive electronic component 131 facing the drive board 130 side (heat sink cover 120 side), and a receiving part 1422 for receiving the power supply electronic component 151 facing the power board 150 side (motor board 150 side). It is arranged between the drive board 130 and the power supply board 150 toward the housing 200 side). Since the receiving part 1421 and the receiving part 1422 are arranged at positions shifted from each other in a plan view, the height from the surface of the drive electronic component 131 and the power supply electronic component 151 can be absorbed, and the distance in the direction of the rotation axis can be shortened. be able to.

The substrate holding member 140 has holding parts 141 that hold the drive board 130 and the power supply board 150 at a predetermined distance at four corners of the rectangular part. The predetermined distance is a distance such that the tallest component among the drive electronic component 131 and the power supply electronic component 151 does not come into contact with the opposing substrate. One end of the holding portion 141 is fixed to the surface of the power supply board 150 on which the power supply electronic component 151 is mounted, and the other end is fixed to the surface of the drive board 130 on which the drive electronic component 131 is mounted. According to this, with the substrate holding member 140, there is no need to provide the heat sink cover 120 with a support for fixing the power supply board 150, and the area of the drive board 130 can be increased.

Further, the substrate holding member 140 has a holding member connecting terminal 143 connected to the motor connecting terminal 210. Since the board holding member 140 is provided with the holding member connecting terminal 143 to which the motor connecting terminal 210 is connected in order to assemble the control unit 100 and the motor housing 200, when the motor connecting terminal 210 is pushed into the holding member connecting terminal 143, the driving The substrate 130 and the power supply substrate 150 can be maintained at a predetermined distance. In this way, by having the function of maintaining the drive board 130 and the power supply board 150 at a predetermined distance when pushing the motor connection terminal 210 in order to assemble the control unit 100 and the electric motor MT, it is possible to apply a load to the assembled part. Assembleability can be improved without any problems.

The board holding member 140 has a guide hole 145 that guides the power supply drive terminal 132 when assembling the power supply board 150 and the drive board 130. The diameter of the guide hole 145 is large on the surface facing the drive board 130 and small on the surface facing the power supply board 150, so it has the function of guiding the power supply terminal 132 provided on the drive board 130 during assembly. In this way, when assembling a plurality of boards in the control unit 100, by having the function of guiding the terminals that electrically connect the boards, ease of assembly can be improved. Further, the board holding member 140 includes a press-in cover 146 for protecting the holding member connecting terminal 143 and guiding the motor connecting terminal 210 when the motor connecting terminal 210 is pushed into the holding member connecting terminal 143.

The control board 160 has a rotation sensor 161 (MR sensor 161) for detecting the rotation of the rotating shaft of the electric motor MT on one surface, and a microcomputer 162 (see FIG. (not shown) is installed in 7. The control board 160 is arranged closer to the electric motor MT than the power supply board 150 in the axial direction of the output shaft RT, with the surface on which the rotation sensor 161 is mounted facing the electric motor MT side. The control board 160 has a control board connection terminal hole 163 for connecting the power supply control terminal 152. Further, the control board 160 has a control terminal connection hole 164 connected to the control terminal 113 at the end.

As described above, the control unit 100 of the electric power steering device 1 is equipped with the connector assembly 110 located farthest from the electric motor MT, the heat sink cover 120 fixed to the motor housing 200, and the drive electronic component 131. The drive board 130 is arranged with the surface opposite to the surface on which it is mounted facing the heat sink cover 120 side, and the surface on which the power supply electronic component 151 is mounted faces the drive board 130 side and is placed closer to the electric motor MT side than the drive board 130. It has a power supply board 150 to be placed, a receiving part 1421/1422 that receives the driving electronic components 131, etc., and a holding part 141 that holds the driving board 130 and the power supply board 150 at a predetermined distance. The control board 160 is provided with a board holding member 140 disposed therebetween, and a control board 160 mounted with a control unit 162 for controlling the drive electronic component 131 and disposed on the electric motor MT side from the power supply board 150. According to this, a heat sink is provided at the end of the device near the drive board 130 that generates a large amount of heat, and the heat sink is placed in direct contact with the outside air, and a board holding member is placed between the boards in the control unit 100. By providing 140, it is possible to provide the electric power steering device 1 that has good heat dissipation and good assemblability due to modularization.

The control unit 100 described above is preferably assembled as follows. First, as shown in FIG. 8, the drive board 130 and the board holding member 140 are assembled. That is, the power supply terminal 132 of the drive board 130 is inserted into the guide hole 145 of the board holding member 140 while being guided, and is fitted into the receiving part 1421 that receives the drive electronic component 131 . Then, the drive board 130 and the board holding member 140 are fixed at one end of the holding part 141.

Next, the drive board 130 and the board holding member 140 are integrated, and the drive board 130 is fixed to the heat sink cover 120 on the opposite side to the face on which the board holding member 140 is fixed. Note that the drive board 130 has a fixing hole 133, and is attached to a boss provided on the heat sink cover 120 with a screw through the fixing hole 133. Note that the substrate holding member 140 has a screw prevention portion 148 at a position corresponding to the fixing hole 133, making it easy to attach with screws.

Next, as shown in FIG. 9, the power supply board 150 is attached to the integrated structure from the heat sink cover 120 to the board holding member 140. That is, the power supply electronic component 151 of the power supply board 150 is fitted into the receiving part 1422 of the board holding member 140, and the other end of the holding part 141 is attached to the surface of the board holding member 140 opposite to the surface on which the drive board 130 is fixed. Fix the power supply board 150. Then, as shown in this figure, the power control terminal 152 of the power supply board 150, the cover fixing part 121 provided on the heat sink cover 120, and the control terminal 113 protrude from the upper surface of the control unit 100.

Next, as shown in FIG. 10, from the side of the fixed power supply board 150, fit the control board connection terminal hole 163 and the control terminal connection hole 164 of the control board 160 with the power supply control terminal 152 and the control terminal 113. Then, the control board 160 is fixed to the cover fixing part 121 of the heat sink cover 120. By fixing the control board 160 to the heat sink cover 120 in this way, the positional deviation between the rotation sensor 161 that detects the rotation of the rotation shaft of the electric motor MT and the center of the rotation shaft can be minimized. Note that the method of attaching the control board 160 is not limited to this, and for example, as shown in FIG. The control board 160 may include a holding member fixing part 144 and be fixed to the holding member fixing part 144 . By fixing the control board 160 to the board holding member 140 in this manner, better assembly efficiency can be obtained through modularization.

As shown in FIGS. 10 and 11, a rotation sensor 161 is arranged at a position corresponding to the tip of the rotating shaft of the electric motor MT. Further, the holding member connection terminal 143 to which the motor connection terminal 210 extending from the motor housing 200 to be attached next is connected is visible from the electric motor MT side, and the control unit 100 and the motor housing 200 can be attached. The electric power steering device 1 is completed by attaching the motor housing 200 to the assembly from the heat sink cover 120 to the control board 160 so that the motor connection terminals 210 and the holding member connection terminals 143 are matched. According to this, a heat sink is provided at the end of the device near the drive board 130 that generates a large amount of heat, and the heat sink is placed in direct contact with the outside air, and the board holding member 140 is placed between the boards in the control unit. By providing this, it is possible to provide a method for manufacturing the electric power steering device 1 that has good heat dissipation and good assemblability due to modularization.

Note that although the timing for fixing the drive board 130 to the heat sink cover 120 is described above as being when the drive board 130 and the board holding member 140 are assembled, the timing is not limited to this, and the timing is not limited to this, but it may be fixed to the heat sink cover 120 at a timing such as that shown in FIG. The drive board 130, the board holding member 140, and the power supply board 150 may be in an assembled state. In one embodiment, the driving board 130, the board holding member 140, the power supply board 150, and the control board 160 may be in an assembled state.

Moreover, although the example in which the control board 160 is fixed to the cover fixing part 121 of the heat sink cover 120 has been described above, the control board 160 is not limited to this, and the control board 160 may be fixed to the board holding member 140. For example, as shown in FIG. 13, the board holding member 140 includes a holding member fixing part 144 for fixing the control board 160 on the outside of the holding part 141 in the radial direction of the output shaft RT. It may be fixed to the fixed part 144. By fixing the control board 160 to the board holding member 140 in this manner, better assembly efficiency can be obtained through modularization.

It should be noted that the present invention is not limited to the illustrated embodiments, and can be implemented with configurations within a range that does not depart from the content described in each section of the claims. That is, although the present invention has been particularly illustrated and described primarily with respect to particular embodiments, there may be other modifications to the embodiments described above without departing from the spirit and scope of the invention. Various modifications can be made by those skilled in the art in other detailed configurations.

For example, in the electric power steering device 1 of the above embodiment, the electric motor and the control unit each have two redundant systems, but they may not be redundant, and the number of redundant systems may be three or more. Good too.

1 Electric power steering control device 10A/B 1st system/2nd system 100 (100A/B) Control unit (1st control system/2nd control system)
110 Connector assembly 111 Connector 112 Power supply terminal 113 Control terminal 120 Heat sink cover 121 Cover fixing part 130 Drive board 131 Drive electronic component 132 Power drive terminal 133 Fixing hole 140 Board holding member 141 Holding part 1421/1422 Receiving part 143 Holding member Connection terminal 144 Holding member fixing part 145 Guide hole 146 Press-in cover 148 Screw removal part 150 Power supply board 151 Power supply electronic component 152 Power supply control terminal 153 Power supply terminal connection hole 160 Control board 161 Rotation sensor (MR sensor)
162 Control unit (microcomputer)
163 Control board connection terminal hole 164 Control terminal connection hole 200 Motor housing 210 Motor connection terminal MTA 1st electric motor MTB 2nd electric motor RT Output shaft of electric motor

Claims (9)

An electric power steering device comprising: a motor housing that accommodates an electric motor that drives a vehicle steering mechanism; and a control unit disposed on the opposite side of the output shaft of the electric motor.
The motor housing includes a motor connection terminal that is electrically connected to the electric motor and extends toward the control unit;
The control unit includes:
a connector assembly disposed farthest from the electric motor and formed with a plurality of connectors for connecting to external cables;
a heat sink cover mounted with the connector assembly and fixed to the motor housing;
a driving board on which a driving electronic component for driving the electric motor is mounted, and the driving board is arranged with a surface opposite to a surface on which the driving electronic component is mounted facing the heat sink cover side;
A power supply electronic component for generating power for the drive board is mounted, and the power supply electronic component is disposed closer to the electric motor than the drive board in the direction of the output shaft, with the surface on which the power supply electronic component is mounted facing the drive board. a power supply board,
A board holding member that is disposed between the drive board and the power supply board, the member having a receiving part that receives the drive electronic component and the power supply electronic component, and a holding part that holds the drive board and the power supply board at a predetermined distance. and,
A rotation sensor for detecting the rotation of the output shaft and a control unit for controlling the drive electronic components are mounted, and the surface on which the rotation sensor is mounted faces the electric motor side, and the rotation sensor is mounted in the direction of the output shaft. a control board disposed closer to the electric motor than the power supply board;
An electric power steering device equipped with The board holding member has a holding member connection terminal connected to the motor connection terminal,
Claim characterized by having a function of maintaining the drive board and the power supply board at a predetermined distance when the motor connection terminal is pushed into the holding member connection terminal in order to assemble the control unit and the motor housing. 1. The electric power steering device according to 1. The drive board has a power drive terminal that electrically connects the power supply board,
The electric power steering device according to claim 1 or 2, wherein the board holding member has a function of guiding the power supply terminal when assembling the power supply board and the drive board. One end of the holding part is fixed to a surface of the power supply board on which the power supply electronic component is mounted,
The electric power steering device according to any one of claims 1 to 3, wherein the other end of the holding portion is fixed to a surface of the drive board on which the drive electronic component is mounted. The connector assembly includes a power supply terminal that connects a power cable connected to the connector assembly and the power supply board, and a control terminal that connects the control cable and the control board that are connected to the connector assembly,
The electric power steering device according to any one of claims 1 to 4, wherein the control terminal is arranged radially outward of the output shaft from the power supply terminal. The board holding member includes a holding member fixing part for fixing the control board radially outward of the output shaft from the holding part,
The electric power steering device according to any one of claims 1 to 5, wherein the control board is fixed to the holding member fixing part. The heat sink cover includes a cover fixing part for fixing the control board radially outward of the output shaft from the holding part,
The electric power steering device according to any one of claims 1 to 5, wherein the control board is fixed to the cover fixing part. The electric motor has two windings that function as a redundant system,
8. The plurality of connectors of the connector assembly, the control board, the drive board, and the power supply board have a redundant system corresponding to a redundant system of the electric motor. electric power steering device. In an electric power steering device including an electric motor that drives a steering mechanism for a vehicle, a manufacturing method for manufacturing a control unit disposed on a side opposite to an output shaft of the electric motor, the manufacturing method comprising:
The control unit includes:
a heat sink cover fixed to a motor housing housing the electric motor;
a driving board on which a driving electronic component for driving the electric motor is mounted, and the driving board is arranged with a surface opposite to a surface on which the driving electronic component is mounted facing the heat sink cover side;
A power supply electronic component for generating power for the drive board is mounted, and the power supply electronic component is disposed closer to the electric motor than the drive board in the direction of the output shaft, with the surface on which the power supply electronic component is mounted facing the drive board. a power supply board,
A board holding member that is disposed between the drive board and the power supply board, the member having a receiving part that receives the drive electronic component and the power supply electronic component, and a holding part that holds the drive board and the power supply board at a predetermined distance. and,
A rotation sensor for detecting the rotation of the output shaft and a control unit for controlling the drive electronic components are mounted, and the surface on which the rotation sensor is mounted faces the electric motor side, and the rotation sensor is mounted in the direction of the output shaft. a control board disposed closer to the electric motor than the power supply board;
Equipped with
fitting the drive electronic component into the receiving portion and fixing the drive board and the board holding member;
fixing the drive board to the heat sink cover on a surface opposite to the surface on which the board holding member is fixed;
fitting the power supply electronic component into the receiving portion, and fixing the power supply board to a surface of the board holding member opposite to the surface on which the drive board is fixed;
fixing the control board to the heat sink cover from the fixed power supply board side;
Production method.