JP2021007286A - Driving device - Google Patents

Abstract

To provide a driving device capable of preventing erroneous assembly.SOLUTION: A driving device 1 comprises: a plurality of first fixing parts 50 for fixing a connector unit 35 to a heat sink 245; a plurality of second fixing parts 52 and 54 for fixing substrates 230 and 235 to the heat sink 245; and a plurality of third fixing parts 56 for fixing the heat sink 245 to a motor 80. The plurality of first fixing parts 50 are disposed in point symmetry with respect to an axial center Ax of the motor 80. A connector assembly regulation part 505 which is formed in the connector unit 35 allows the connector unit 35 and the heat sink 245 to be combined in such a manner that one first through-hole 501 of the first fixing parts 50 is coincident with one first screw hole 502, and regulates the combination of the connector unit 35 and the heat sink 245 in such a manner that the one first through-hole 501 is coincident with the other first screw hole 502, by interfering the second fixing parts 52.SELECTED DRAWING: Figure 14

Description

The present invention relates to a drive device.

Conventionally, a drive device in which a motor and a control unit for controlling the motor are integrally provided is known. Patent Document 1 discloses a drive device used in an electric power steering device. In this drive device, the motor has two winding sets, and the control unit has two control unit units so that the current is independently supplied to each winding set. The control unit is provided with two connectors corresponding to each control unit unit. These connectors are integrally formed with a cover that covers each control unit unit.

Japanese Unexamined Patent Publication No. 2017-189034

By the way, when the control unit is configured into a plurality of systems to make it redundant, it is conceivable to arrange the parts of each system in a point symmetry or a line symmetry with respect to the motor axis, for example. In that case, there is a high possibility that the connector unit having a plurality of connectors and terminal groups corresponding to each system is also formed point-symmetrically or line-symmetrically with respect to the motor axis. Then, when assembling the connector unit to the heat sink, there is a concern that it may be assembled in the wrong direction. For example, in the case of two control units, there is a concern that the connector units may be assembled 180 ° in opposite directions.

The present invention has been made in view of the above points, and an object of the present invention is to provide a drive device capable of preventing erroneous assembly.

The drive device of the present invention includes a motor (80) having a plurality of winding sets (801 and 802), a heat sink (245) fixed to the motor, and a plurality of systems corresponding to the plurality of winding sets. A connector unit (230, 235) on which the electronic components of the above are mounted and fixed to a heat sink, and a connector unit (230, 235) having a plurality of terminals corresponding to each of a plurality of electronic components and fixed to the heat sink. 35) and. Further, the drive device includes a plurality of first fixing portions (50) for fixing the connector unit to the heat sink, a plurality of second fixing portions (52, 54) for fixing the substrate to the heat sink, and the heat sink as a motor. A plurality of third fixing portions (56) fixed to the above are provided.

The plurality of first fixed portions are arranged point-symmetrically or line-symmetrically with respect to the axial center (Ax) of the motor. The first fixing portion has a first through hole (501) formed in the connector unit, a first engaged hole (502) formed in the heat sink, and a first engaged hole through which the first through hole is inserted. Includes a first engaging member (157) engaged in. The connector assembly restricting unit (505) formed on the connector unit allows the connector unit and the heat sink to be combined so that the first through hole matches the first engaged hole. Interfering with the combination of the connector unit and the heat sink so that the first through hole of the connector matches the other first engaged holes except the one first engaged hole, the second fixing portion, the heat sink or the substrate. Regulate by doing.

As a result, even if the plurality of first fixing portions are arranged point-symmetrically or line-symmetrically with respect to the motor axis, when the orientation of the connector unit with respect to the heat sink is incorrect, the first through hole and the first cover are provided. It does not match the engagement hole and cannot be assembled. Therefore, it is possible to prevent erroneous assembly.

Further, since it is possible to prevent erroneous assembly without providing a means such as a fitting structure, it is possible to suppress an increase in manufacturing cost and an increase in size of the device.

The block diagram of the electric power steering apparatus to which the drive apparatus according to one Embodiment is applied. Vertical cross-sectional view of the drive unit. FIG. 2 is a sectional view taken along line III-III of FIG. The schematic diagram which shows the structure of a polyphase coaxial motor. A circuit configuration diagram of a drive device according to an embodiment. The control block diagram of the drive device by one Embodiment. It is a top view of the control part of the drive device by one Embodiment, and is the VII arrow view of FIG. It is a bottom view of the control part of the drive device according to one Embodiment, and is the VIII arrow view of FIG. It is a top view of the substrate and the heat sink of the drive device by one Embodiment, and is the figure corresponding to FIG. It is a figure which shows the state in the process of assembling the control part of the drive device by one Embodiment, and is the figure which shows the state of the connector unit in a normal posture with respect to a heat sink. XI-XI line sectional view of FIG. FIG. 10 is a sectional view taken along line XII-XII of FIG. It is a figure which shows the state in the process of assembling the control part of the drive device by one Embodiment, and is the figure which shows the state of the connector unit in a non-normal posture with respect to a heat sink. FIG. 13 is a sectional view taken along line XIV-XIV of FIG. It is a figure which shows the state in the process of assembling the control part of the drive device by one Embodiment, and is the figure which shows the state of the connector unit in a non-normal posture with respect to a heat sink. FIG. 15 is a sectional view taken along line XVI-XVI of FIG. It is a figure which shows the state in the process of assembling the control part of the drive device by one Embodiment, and is the figure which shows the state of the 1st substrate in a normal posture with respect to a heat sink. It is a figure which shows the state in the process of assembling the control part of the drive device by one Embodiment, and is the figure which shows the state of the 1st substrate in a non-normal posture with respect to a heat sink. It is a figure which shows the state in the process of assembling the control part of the drive device by one Embodiment, and is the figure which shows the state of the 2nd substrate in a normal posture with respect to a heat sink. It is a figure which shows the state in the process of assembling the control part of the drive device by one Embodiment, and is the figure which shows the state of the 2nd substrate in a non-normal posture with respect to a heat sink. It is the top view of the part excluding the cover of the drive device by one Embodiment, and is the figure corresponding to FIG. It is a figure which shows the state in the process of assembling the control part of the drive device by one Embodiment, and is the figure which shows the state of the control part in a normal posture with respect to a motor. It is a figure which shows the state in the process of assembling the control part of the drive device by one Embodiment, and is the figure which shows the state of the control part in a non-normal posture with respect to a motor.

Hereinafter, embodiments of the drive device will be described with reference to the drawings. The drive device is applied to the electric power steering device of the vehicle and outputs steering assist torque.

First, the configuration of the electric power steering device will be described with reference to FIGS. 1 to 4. FIG. 1 shows the overall configuration of the steering system 99 including the electric power steering device 90. The electric power steering device 90 shown in FIG. 1 is a rack assist type, but in other embodiments, the electric power steering device may be of another type such as a column assist type.

The steering system 99 includes a steering wheel 91, a steering shaft 92, a pinion gear 96, a rack shaft 97, wheels 98, an electric power steering device 90, and the like. The rotational motion of the handle 91 is transmitted to the pinion gear 96 via the steering shaft 92 and converted into a linear motion of the rack shaft 97. The pair of wheels 98 provided at both ends of the rack shaft 97 are steered at an angle corresponding to the amount of displacement of the rack shaft 97.

The electric power steering device 90 includes a steering torque sensor 93, a drive device 1, a speed reducer 94, and the like. The steering torque sensor 93 is provided in the middle of the steering shaft 92 and detects the steering torque. In the embodiment shown in FIG. 1, the duplicated steering torque sensor 93 includes the first torque sensor 931 and the second torque sensor 932, and detects the first steering torque trq1 and the second steering torque trq2 in duplicate. When the steering torque sensor is not provided redundantly, the detection value of one steering torque trq may be used in common for the two systems.

The drive device 1 includes a motor 80 and a control unit 10 provided integrally with the motor 80. The motor 80 and the control unit 10 constitute a mechanical and electrical integrated drive device 1. In the form shown in FIG. 1, the control unit 10 is arranged coaxially with the motor 80 on the side opposite to the output side of the motor 80. In another embodiment, the control unit 10 may be arranged on the output side of the motor 80.

As shown in FIGS. 2 and 3, the motor 80 is a three-phase brushless motor and includes a stator 840, a rotor 860, and a housing 830 for accommodating them. The stator 840 has a stator core 845 fixed to the housing 830 and two sets of three-phase winding sets 801 and 802 assembled to the stator core 845. Lead wires 851, 853, and 855 extend from the phase windings constituting the first winding set 801. Lead wires 852, 854, and 856 extend from each phase winding constituting the second winding set 802.

The rotor 860 has a shaft 87 supported by a rear bearing 835 and a front bearing 836, and a rotor core 865 into which the shaft 87 is fitted. The rotor 860 is provided inside the stator 840 and is rotatable relative to the stator 840. A permanent magnet 88 is provided at one end of the shaft 87.

The housing 830 has a tubular motor case 834, a rear frame end 837 provided at one end of the motor case 834, and a front frame end 838 provided at the other end of the motor case 834. The rear frame end 837 and the front frame end 838 are fastened to each other by bolts or the like, and sandwich the motor case 834. The lead wires 851 to 856 are connected to the control unit 10 through the lead wire insertion holes 839 of the rear frame end 837.

As shown in FIG. 4, the winding sets 801 and 802 have the same electrical characteristics and are arranged on the common stator core 845 with an electric angle of 30 [deg].

As shown in FIG. 1, the control unit 10 acquires the steering torque trq1 and trq2 detected by the steering torque sensor 93 and the electric angles θ1 and θ2 of the motor 80 detected by the rotation angle sensor. The control unit 10 controls the drive of the motor 80 so as to generate a desired assist torque based on such information and information such as the motor current detected inside the control unit 10. The assist torque output by the motor 80 is transmitted to the rack shaft 97 via the speed reducer 94.

Hereinafter, the direction parallel to the axial center Ax of the motor 80 will be referred to as "axial direction". Further, the direction orthogonal to the axial center Ax of the motor 80 is described as "diameter direction".

[One Embodiment]
Next, the configuration of the drive device 1 of one embodiment will be described with reference to FIGS. 2 to 23. As shown in FIGS. 2 and 3, the control unit 10 is a connector unit for connecting the control unit 20, the cover 21 covering the control unit 20, and the control unit 20 to the external connectors 391 and 392 (see FIG. 1). Includes 35 and a sealing member 22 that seals the gap between the connector unit 35 and the cover 21. The external connectors 391 and 392 are connectors for an external cable. The cover 21 protects the control unit 20 from an external impact, and also prevents dust, water, and the like from entering the control unit 20.

The control unit 20 includes a heat sink 245 fixed to the rear frame end 837, substrates 230, 235 and power modules 241 and 242 fixed to the heat sink 245, and various electronic components mounted on the substrates 230 and 235. And have. In FIGS. 2 and 3, the electronic components are not shown. The boards 230 and 235 are provided with electronic component groups for two systems independently for each system, forming a redundant configuration. The power modules 241 and 242 have a switching element and are connected to lead wires 851 to 856 and the like.

The heat sink 245 is provided between the rear frame end 837 and the connector unit 35 in the cover 21, and is fixed to the rear frame end 837 by a screw 156. The substrate 230 is provided at a position facing the rear frame end 837, and is fixed to the heat sink 245 by a screw 158. The substrate 235 is provided at a position facing the connector unit 35, and is fixed to the heat sink 245 by a screw 159.

As shown in FIG. 5, the control unit 20 is a two-system motor control device including two inverters 601 and 602 and two microcomputers 401 and 402, and is a motor having two sets of winding sets 801 and 802. Power 80. Here, the unit of the component including the winding set, the inverter, and the microcomputer is defined as "system".

In the specification, if necessary, the component or signal of the first system is prefixed with "first" or "first system", and the component or signal of the second system is prefixed with "second". "Or" second system "is added to distinguish. Items common to each system are described together without adding "1st and 2nd" and "1st and 2nd systems". In addition, except for the components of the switching element and the connector unit, "1" is added to the end of the code of the component or signal of the first system, and "2" is added to the end of the code of the component or signal of the second system. I will write it with.

The control unit 20 includes inverters 601 and 602, power supply relays 141 and 142, rotation angle detection units 251 and 252, microcomputers 401 and 402, and the like. In this embodiment, power is independently supplied to each system from the two power supplies 111 and 112.

The inverters 601 and 602 each have six switching elements 611-616 and 621-626, such as bridge-connected, for example, MOSFETs. The first inverter 601 performs a switching operation by a drive signal from the first microcomputer 401, converts the DC power of the first power supply 111, and supplies it to the first winding set 801. The second inverter 602 performs switching operation by the drive signal from the second microcomputer 402, converts the DC power of the second power supply 112, and supplies it to the second winding set 802.

The power relays 141 and 142 are provided in the power supply lines of the input units of the inverters 601 and 602. The power supply relays 141 and 142 illustrated in FIG. 5 include a protection function at the time of reverse power supply connection in which two switching elements in which the parasitic diodes are oriented in opposite directions are connected in series. However, the power relay may be composed of one switching element or a mechanical relay that does not include the reverse connection prevention function. Further, capacitors 161 and 162 are provided at the input portions of the inverters 601 and 602. The capacitors 161 and 162 smooth the power input from the power supply and prevent the outflow of noise due to the switching operation of the switching element and the like. Further, the capacitors 161 and 162 form a filter circuit together with an inductor (not shown).

The first rotation angle detection unit 251 detects the electric angle θ1 of the motor 80 and outputs it to the first microcomputer 401. The second rotation angle detection unit 252 detects the electric angle θ2 of the motor 80 and outputs it to the second microcomputer 402. The first rotation angle detection unit 251 has a power supply line and a signal line independent of the second rotation angle detection unit 252. The first rotation angle detection unit 251 and the second rotation angle detection unit are both packaged to form the rotation angle sensor 25.

The first microcomputer 401 calculates a drive signal commanded to the first inverter 601 based on feedback information such as steering torque trq1, current Im1, and rotation angle θ1. The second microcomputer 402 calculates a drive signal commanded to the second inverter 602 based on feedback information such as steering torque trq2, current Im2, and rotation angle θ2.

FIG. 6 shows the control configuration of the drive device 1. In FIG. 6, the first system and the second system are composed of two sets of completely independent element groups, and form a redundant configuration. Among the control units 20, each electronic component of the first system that controls energization of the winding set 801 constitutes the first system control unit unit 201. Further, among the control units 20, each electronic component of the second system that controls energization of the winding set 802 constitutes the second system control unit unit 202.

The connector unit 35 is connected to the first system terminal group connected to the first system control unit unit 201, the first system connector 351 holding the first system terminal group, and the second system control unit unit 202. It has a second system terminal group and a second system connector 352 that holds the second system terminal group.

In the first system terminal group, signals are input to the first power supply terminals (that is, the first power supply bus bar) 121 and 131 for supplying power to the first system control unit unit 201 and the first system control unit unit 201. A first vehicle communication terminal 311 and a first torque signal terminal 331 for the purpose are included. In the second system terminal group, signals are input to the second power supply terminals (that is, the second power supply bus bar) 122 and 132 for supplying power to the second system control unit unit 202 and the second system control unit unit 202. A second vehicle communication terminal 312 and a second torque signal terminal 332 for the purpose are included.

The first power supply terminals 121 and 131 are connected to the first power supply 111. The electric power of the first power supply 111 is supplied to the first winding set 801 via the first power supply terminals 121 and 131, the first power supply relay 141 and the first inverter 601. Further, the power of the first power supply 111 is also supplied to the first microcomputer 401 and the sensors of the first system.

The second power supply terminals 122 and 132 are connected to the second power supply 112. The electric power of the second power supply 112 is supplied to the second winding set 802 via the second power supply terminals 122 and 132, the second power supply relay 142, and the second inverter 602. Further, the electric power of the second power source 112 is also supplied to the second microcomputer 402 and the sensors of the second system.

When CAN is redundantly provided as a vehicle communication network, the first vehicle communication terminal 311 is connected between the first CAN 301 and the first vehicle communication circuit 321. The second vehicle communication terminal 312 is connected between the second CAN 302 and the second vehicle communication circuit 322. If the CAN is not provided redundantly, the two vehicle communication terminals 311 and 312 may be connected to a common CAN. Further, as a vehicle communication network other than CAN, a network of any standard such as CAN-FD (CAN with Flexible Data rate) or FlexRay may be used.

The first torque signal terminal 331 is connected between the first torque sensor 931 and the first torque sensor input circuit 341. The first torque sensor input circuit 341 notifies the first microcomputer 401 of the steering torque trq1 detected by the first torque signal terminal 331. The second torque signal terminal 332 is connected between the second torque sensor 932 and the second torque sensor input circuit 342. The second torque sensor input circuit 342 notifies the second microcomputer 402 of the steering torque trq2 detected by the second torque signal terminal 332.

The microcomputers 401 and 402 can transmit and receive information to each other by communication between the microcomputers. When an abnormality occurs in one system, the control unit 20 continues motor control in the other normal system.

As shown in FIGS. 2, 3 and 7, the connector unit 35 has a base portion 350, a connector portion 351 and a connector fixing boss portion 354, a cover fixing boss portion 355, and each system terminal group. The base portion 350 is provided in the cover 21. The connector portion 351 has two connectors 351 and 352. The connectors 351 and 352 project axially from the base portion 350 to the outside of the cover 21 through the opening 211.

The first system connector 351 has a connection frontage 356 to the external connector 391. The first power supply terminals 121 and 131, the first vehicle communication terminal 311 and the first torque signal terminal 331 are arranged in the connection frontage 356. The second system connector 352 has a connection frontage 357 to the external connector 392. Second power supply terminals 122 and 132, a second vehicle communication terminal 312, and a second torque signal terminal 332 are arranged at the connection frontage 357.

The connector fixing boss portion 354 is formed so as to protrude outward in the radial direction from the base portion 350. The connector unit 35 is fixed to the heat sink 245 by a screw 157 through which the connector fixing boss portion 354 is inserted. The cover fixing boss portion 355 is formed radially outward with respect to the connector portion 351 of the base portion 350. The cover 21 is fixed to the cover fixing boss portion 355 by a screw 155.

Next, the arrangement of the components of the control unit 10 and the fixing structure of each member will be described. As described above, the control unit 10 is composed of two completely independent component groups, and has a redundant configuration. The component groups of each system are arranged point-symmetrically with respect to the axial center Ax of the motor 80. Specifically, two systems of electronic components are arranged point-symmetrically with respect to the axis Ax on the boards 230 and 235, and two systems of connectors and terminal groups are arranged on the connector unit 35 at the axis Ax. It is arranged point-symmetrically with respect to.

The lead wires 851, 853, 855 of the first system and the lead wires 852, 854, 856 of the second system are arranged point-symmetrically with respect to the axial center Ax. Further, as shown in FIG. 8, the plurality of terminals 171 of the power module 241 of the first system and the plurality of terminals 172 of the power module 242 of the second system, which are the connection destinations thereof, are also point-symmetric with respect to the axial center Ax. Is located in.

As shown in FIG. 8, the plurality of lead wires 181 extending from the power module 241 to the substrate 230 and the plurality of lead wires 182 extending from the power module 242 to the substrate 230 are arranged point-symmetrically with respect to the axial center Ax. There is. Further, the substrate holes 261 and the substrate holes 262 of the substrate 230 to which they are connected are also arranged point-symmetrically with respect to the axial center Ax.

As shown in FIG. 9, the plurality of lead wires 191 extending from the power module 241 to the substrate 235 and the plurality of lead wires 192 extending from the power module 242 to the substrate 235 are arranged point-symmetrically with respect to the axial center Ax. There is. Further, the substrate holes 271 and the substrate holes 272 of the substrate 230 to which they are connected are also arranged point-symmetrically with respect to the axial center Ax.

As shown in FIG. 8, the first vehicle communication terminal 311 and the first torque signal terminal 331 extending from the connector unit 35 to the substrate 230 and the second vehicle communication terminal 312 and the second torque signal terminal 332 have an axial center Ax. It is arranged point-symmetrically with respect to. Further, the substrate holes 281 and the substrate holes 282 of the substrate 230 to which they are connected are also arranged point-symmetrically with respect to the axial center Ax.

As shown in FIG. 7, the first power supply terminals 121 and 131 extending from the connector unit 35 to the substrate 235 and the second power supply terminals 122 and 132 are arranged point-symmetrically with respect to the axial center Ax. Further, the substrate holes 291 and the substrate holes 292 of the substrate 230 to which they are connected are also arranged point-symmetrically with respect to the axial center Ax.

Since the component groups of each system are arranged point-symmetrically in this way, each member provided with them, that is, the heat sink 245, the substrate 230, 235, and the connector unit 35 also has a substantially point-symmetrical shape. .. Then, when assembling each member, there is a concern that they are assembled in the opposite directions by 180 °. In this embodiment, the following configuration is provided in order to solve the above problem.

As shown in FIGS. 2, 7, 8 and 9, the drive device 1 has a plurality of first fixing portions 50 fixing the connector unit 35 to the heat sink 245 and the substrate 230 fixed to the heat sink 245. A plurality of second fixing portions 52, a plurality of second fixing portions 54 fixing the substrate 235 to the heat sink 245, and a plurality of third fixing portions 56 fixing the heat sink 245 to the rear frame end 837. I have.

As shown in FIGS. 2 and 7, the two first fixing portions 50 are arranged point-symmetrically with respect to the axial center Ax. The first fixing portion 50 includes a first through hole 501 formed in the connector fixing boss portion 354 of the connector unit 35, a first screw hole 502 as a first engaged hole formed in the heat sink 245, and a first screw hole 502. It includes a screw 157 as a first engaging member through which the through hole 501 is inserted and engaged with the first screw hole 502.

As shown in FIGS. 10 to 12, the facing wall 503 of the connector unit 35 with the substrate 235 is formed in a shape that is non-point symmetric with respect to the axial center Ax. As shown in FIG. 11, the facing wall 503 is formed with a relief portion 504 that allows the head of the screw 159 to escape when assembled in a normal posture. Further, as shown in FIGS. 13 and 14, when the facing wall 503 is assembled in a non-regular posture in the opposite direction by 180 °, the connector assembly regulation that interferes with the head of the screw 159 during the assembly is restricted. The portion 505 is formed. The connector assembly restricting unit 505 is composed of a part of the facing wall 503.

As shown in FIGS. 10 to 12, the connector assembly restricting unit 505 combines the connector unit 35 and the heat sink 245 so that the first through hole 501 coincides with the first screw hole 502. Tolerate. On the other hand, as shown in FIGS. 13 to 16, in the connector assembly restricting unit 505, the connector unit 35 and the heat sink 245 are combined so that the other first through hole 501 matches the first screw hole 502. This is regulated by interfering with the head of the screw 159 of the second fixing portion 52.

As shown in FIG. 8, the two second fixing portions 52 are arranged non-point symmetric with respect to the axial center Ax. As shown in FIGS. 8 and 17, the second fixing portion 52 includes a second through hole 521 formed in the substrate 230 and a second screw hole 522 as a second engaged hole formed in the heat sink 245. Includes a screw 158 as a second engaging member that is inserted through the second through hole 521 and engaged with the second screw hole 522.

As shown in FIGS. 17 and 18, one second through hole 521 is in a state in which the substrate 230 engages with the lead wires 181, 182 of the power modules 241 and 242 as "electronic components fixed to the heat sink 245". In, only one second screw hole 522 is matched, and the other second screw hole 522 is not matched. That is, as shown in FIG. 17, when assembled in a normal posture, one second through hole 521 corresponds to one second screw hole 522, and the other second through hole 521 is another second screw hole 522. Matches. On the other hand, as shown in FIG. 18, when assembled in a non-regular posture in the opposite direction of 180 °, one second through hole 521 does not match the other second screw hole 522, and the other second through hole 521 Does not match the first second screw hole 522.

As shown in FIG. 9, the two second fixing portions 54 are arranged non-point symmetric with respect to the axial center Ax. As shown in FIGS. 9 and 19, the second fixing portion 54 includes a second through hole 541 formed in the substrate 235 and a second screw hole 542 as a second engaged hole formed in the heat sink 245. , Includes a screw 159 as a second engaging member that is inserted through the second through hole 541 and engaged with the second screw hole 542.

As shown in FIGS. 19 and 20, one second through hole 541 is a state in which the substrate 235 engages with the lead wires 191 and 192 of the power modules 241 and 242 as "electronic components fixed to the heat sink 245". In, only one second screw hole 542 is matched, and the other second screw hole 542 is not matched. That is, as shown in FIG. 19, when assembled in a normal posture, one second through hole 541 corresponds to one second screw hole 542, and the other second through hole 541 is another second screw hole 542. Matches. On the other hand, as shown in FIG. 20, when assembled in a non-regular posture in the opposite direction of 180 °, one second through hole 541 does not match the other second screw hole 542, and the other second through hole 541 Does not match the first second screw hole 542.

As shown in FIGS. 21 and 22, the two third fixing portions 56 are arranged point-symmetrically with respect to the axial center Ax. The third fixing portion 56 is inserted through the third through hole 561 formed in the heat sink 245, the third screw hole 562 as the third engaged hole formed in the motor 80, and the third through hole 561. 3 Includes a screw 156 as a third engaging member that engages the screw hole 562.

As shown in FIGS. 9 and 21, when the direction parallel to the axial center Ax is the axial direction, the outer shape of the heat sink 245 in the axial direction is formed non-point symmetric with respect to the axial center Ax. Specifically, it is a portion that protrudes radially outward from the base portion of the heat sink 245, and the protruding portion provided with the first screw hole 502 and the third through hole 561 is formed non-point symmetrically. One of the two protruding portions is provided with a heat sink assembly restricting portion 565 that protrudes in the circumferential direction. The heat sink assembly restricting portion 565 is composed of a part of a portion forming the outer shape of the heat sink 245 in the axial direction.

As shown in FIGS. 7 and 8, the heat sink assembly restricting unit 565 is used from both the axial direction side and the axial direction other side in a state where the substrate 230, 235 and the connector unit 35 are assembled to the heat sink 245. It is visible.

As shown in FIG. 22, the heat sink assembly restricting unit 565 allows the heat sink 245 and the motor 80 to be combined so that the first third through hole 561 coincides with the first third screw hole 562. On the other hand, as shown in FIG. 23, the heat sink assembly restricting unit 565 indicates that the heat sink 245 and the motor 80 are combined so that the other third through hole 561 matches the one third screw hole 562. It is regulated by interfering with the assembly jig 45 as a "member provided integrally with the motor 80". The heat sink 245 is assembled to the motor 80 with the assembly jig 45 integrally provided with the motor 80.

(effect)
As described above, in the present embodiment, the drive device 1 has a plurality of first fixing portions 50 fixing the connector unit 35 to the heat sink 245 and a plurality of second fixing portions 50 fixing the substrate 230 to the heat sink 245. It includes a fixing portion 52, a plurality of second fixing portions 54 fixing the substrate 235 to the heat sink 245, and a plurality of third fixing portions 56 fixing the heat sink 245 to the motor 80.

The plurality of first fixing portions 50 are arranged point-symmetrically with respect to the axial center Ax of the motor 80. In the connector assembly restricting portion 505 formed on the connector unit 35, the connector unit 35 and the heat sink 245 are combined so that the first through hole 501 of one of the first fixing portions 50 matches the first screw hole 502 of one. The combination of the connector unit 35 and the heat sink 245 so that one first through hole 501 matches the other first screw hole 502 is restricted by interfering with the second fixing portion 52. To do.

As a result, even if the two first fixing portions 50 are arranged point-symmetrically with respect to the motor axis Ax, when the orientation of the connector unit 35 with respect to the heat sink 245 is incorrect, the first through holes 501 and the first through holes 501 and the first 1 The screw hole 502 does not match and cannot be assembled. Therefore, it is possible to prevent erroneous assembly.

Further, since it is possible to prevent erroneous assembly without providing a means such as a fitting structure, it is possible to suppress an increase in manufacturing cost and an increase in size of the device.

Further, since erroneous assembly is prevented by interference with the second fixing portion 52, even if it interferes, it is not easily damaged and the performance of the drive device 1 is not affected.

Further, in the first embodiment, the facing wall 503 of the connector unit 35 with the substrate 235 is formed in a shape that is non-point symmetric with respect to the axial center Ax. The facing wall 503 is formed with a relief portion 504 that allows the head of the screw 159 to escape when assembled in a normal posture. Further, the facing wall 503 is formed with a connector assembly restricting portion 505 that interferes with the head of the screw 159 during assembly when assembled in a non-regular posture in the opposite direction of 180 °. The connector assembly restricting unit 505 is composed of a part of the facing wall 503. As a result, the connector assembly restricting unit 505 for preventing erroneous assembly of the connector unit 35 and the heat sink 245 can be provided.

Further, in the first embodiment, the two second fixed portions 52 are arranged non-point symmetric with respect to the axial center Ax. The two second fixing portions 54 are arranged non-point symmetric with respect to the axial center Ax. As a result, the boards 230 and 235 can be assembled to the heat sink 245 when they are in a normal posture, and the boards 230 and 235 can be assembled to the heat sink 245 when they are in a non-normal posture 180 ° opposite to each other. It can be disabled.

Further, in the first embodiment, the second through hole 521 of the second fixing portion 52 matches only the first second screw hole 522 in a state where the substrate 230 is engaged with the lead wires 181 and 182. It does not match the other second screw hole 522. The second fixing portion 54 has the same configuration. As a result, it is possible to prevent erroneous assembly of the substrate 230 and 235 and the heat sink 245.

Further, in the first embodiment, the two third fixed portions 56 are arranged point-symmetrically with respect to the axial center Ax. The heat sink assembly restricting portion 565 formed on the heat sink 245 combines the heat sink 245 and the motor 80 so that the third through hole 561 of one of the third fixing portions 56 matches the third screw hole 562 of one. Tolerate. On the other hand, the heat sink assembly restricting unit 565 is an assembly provided integrally with the motor 80 so that the heat sink 245 and the motor 80 are combined so that the other third through hole 561 matches the one third screw hole 562. It is regulated by interfering with the attached jig 45. This makes it possible to prevent erroneous assembly of the heat sink 245 and the motor 80.

Further, in the first embodiment, the outer shape of the heat sink 245 in the axial direction is formed non-point symmetric with respect to the axial center Ax. The heat sink assembly restricting portion 565 is composed of a part of a portion forming the outer shape of the heat sink 245 in the axial direction. In this way, the heat sink assembly restricting unit 565 can be provided.

Further, in the first embodiment, the heat sink assembly restricting unit 565 can be visually recognized from both the axial direction side and the axial direction other side in a state where the substrate 230, 235 and the connector unit 35 are assembled to the heat sink 245. .. Thereby, when the control unit 10 is assembled to the motor 80, which side the heat sink assembly restricting unit 565 is located can be determined from both the axial direction side and the axial direction other side.

[Other Embodiments]
In another embodiment, the connector assembly restricting portion is not limited to the second fixing portion, and may be configured to interfere with the heat sink or the substrate.

In other embodiments, the second fixing portion is not limited to two, and three or more may be provided.

In other embodiments, the components of each system may be arranged line-symmetrically with respect to the motor axis. Nevertheless, by providing each fixed portion and each regulating portion, it is possible to prevent erroneous assembly.

In other embodiments, the motor may have two sets of windings arranged in phase. Further, the number of phases of the motor is not limited to three, and may be four or more. Further, the motor to be driven is not limited to the AC brushless motor, and may be a DC motor with a brush. In that case, an H-bridge circuit may be used as the "power converter". Further, in other embodiments, the drive device is not limited to the electric power steering device, and may be applied to any other application.

The present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the spirit of the invention.

157: Screw (first engaging member) 230: 235: Substrate 245 Heat sink 35: Connector unit 50: First fixing part 52, 54: Second fixing part 56: Third fixing part 501: First through hole 502: First 1 screw hole (1st engaged hole) 505: Connector assembly control part 80: Motor 801, 802: Winding assembly Ax: Axis center

Claims (7)

A motor (80) having a plurality of winding sets (801, 802) and
A heat sink (245) fixed to the motor and
A substrate (230, 235) in which a plurality of electronic component groups corresponding to the plurality of winding sets are mounted and fixed to the heat sink, and
A connector unit (35) having a plurality of terminals corresponding to each of the plurality of electronic components and fixed to the heat sink.
A plurality of first fixing portions (50) fixing the connector unit to the heat sink,
A plurality of second fixing portions (52, 54) fixing the substrate to the heat sink,
A plurality of third fixing portions (56) fixing the heat sink to the motor,
With
The plurality of first fixed portions are arranged point-symmetrically or line-symmetrically with respect to the axial center (Ax) of the motor.
The first fixing portion is inserted through the first through hole (501) formed in the connector unit, the first engaged hole (502) formed in the heat sink, and the first through hole. 1 Including the first engaging member (157) engaged with the engaged hole,
In the connector assembly restricting unit (505) formed on the connector unit, the connector unit and the heat sink are combined so that one of the first through holes coincides with one of the first engaged holes. The connector unit and the heat sink are combined so that the other first through holes other than the first through hole coincide with the first engaged hole. 2 A drive device that regulates by interfering with a fixed portion, the heat sink, or the substrate. The substrate (235) is arranged between the connector unit and the heat sink.
The plurality of second fixing portions are arranged non-point symmetric or non-linear symmetry with respect to the axial center of the motor.
The wall (503) of the connector unit facing the substrate is formed in a shape that is non-point symmetric or non-line symmetric with respect to the axial center.
The connector assembly restricting portion is formed of a part of the facing wall, and the connector unit and the heat sink are combined so that the other first through hole coincides with one of the first engaged holes. The driving device according to claim 1, wherein is regulated by interfering with the second fixing portion. The driving device according to claim 1, wherein the plurality of second fixing portions are arranged non-point symmetric or non-linear symmetric with respect to the axial center of the motor. The second fixing portion inserts the second through hole (521, 541) formed in the substrate, the second engaged hole (522, 542) formed in the heat sink, and the second through hole. The second engaging member (158, 159) engaged with the second engaged hole is included.
The first second through hole is provided only in the first second engaged hole in a state where the substrate is engaged with the heat sink or an electronic component (181, 182, 191, 192) fixed to the heat sink. The drive device according to claim 2, wherein the drive device matches and does not match the other second engaged hole except for the second engaged hole. The plurality of third fixed portions are arranged point-symmetrically or line-symmetrically with respect to the axis.
The third fixing portion is inserted through the third through hole (561) formed in the heat sink, the third engaged hole (562) formed in the motor, and the third through hole. Including the third engaging member (156) engaged with the engaged hole, including
The heat sink assembly restricting portion (565) formed on the heat sink allows the heat sink and the motor to be combined so that one of the third through holes coincides with one of the third engaged holes. Then, the motor or the motor is combined with the heat sink and the motor so that the other third through holes other than the third through hole coincide with the third engaged hole. The drive device according to claim 1, wherein the drive device is regulated by interfering with a member (45) provided integrally with the motor. When the direction parallel to the axis is the axial direction,
The outer shape of the heat sink in the axial direction is formed to be non-point symmetric or non-line symmetric with respect to the axial center.
The drive device according to claim 5, wherein the heat sink assembly restricting unit includes a part of a portion forming an outer shape of the heat sink in the axial direction. The drive device according to claim 6, wherein the heat sink assembly restricting unit can be visually recognized from both one side in the axial direction and the other side in the axial direction in a state where the substrate and the connector unit are assembled to the heat sink.

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