JP2023042467A - Driving unit - Google Patents

Abstract

To provide a driving unit that includes two or more substrates, and suitably achieves press-fit connection of inter-substrate terminals.SOLUTION: A driving unit comprises two substrates of an end substrate 33 and a general substrate 31 that are provided in layers on the opposite side of a motor 80 with respect to a motor frame 840. A plurality of connector terminals 45 are electrically connected with the end substrate 33 by a press fit method at one end, and exposed to frontages of connectors 57, 58 at the other end. A plurality of inter-substrate terminals 43 are electrically connected between the general substrate 31 and the end substrate 33 by the press fit method. An inter-substrate terminal binder 63 holds an intermediate part of the plurality of inter-substrate terminals 43 to bind the plurality of inter-substrate terminals 43 adjacent to each other. Pressure receiving ribs (pressure receiving supports) 637 are provided between the general substrate 31 and the end substrate 33, are in contact with surfaces of the substrates 31, 33 facing each other, and receive the load applied during assembly.SELECTED DRAWING: Figure 4

Description

The present invention relates to a driving device.

2. Description of the Related Art Conventionally, there has been known a driving device in which a motor and a control unit are integrally provided.

For example, in the drive device disclosed in Patent Document 1, the connector provided on the cover member has connector terminals for power supply and signals extending in the axial direction. The connector terminals are elastically deformable press-fit terminals, and are press-fitted and connected to conductive connecting portions provided on the substrate.

Japanese Patent No. 6443055

In the driving device of Patent Document 1, when the cover member is assembled close to the frame member, it can be easily assembled by press-fit connection that does not require soldering. Since no soldering is required, high temperature heating is not required, reducing energy consumption and _CO2 emissions. In addition, the prohibition area where the element cannot be mounted due to soldering on the substrate is reduced, and the effective mounting area is increased. However, Patent Document 1 only discloses a configuration in which the number of substrates is one and the connector terminals are directly connected to the substrate.

On the other hand, there is a configuration in which two or more substrates are arranged in layers within the control unit. Hereinafter, in this specification, the board provided closest to the connector among the two or more boards will be referred to as the "end board", and one or more boards other than the end board will be referred to as the "general board". For example, in a driving device having two substrates, an inverter circuit that energizes motor windings is mounted on a general substrate. Parts such as a filter circuit and a communication driver are mounted on the end board. The general board and the end board are connected by board-to-board terminals.

In such a two-board configuration, it is necessary to connect inter-board terminals between the end board and the general board in addition to the connection between the connector terminals and the end board. Furthermore, in a configuration including three or more substrates, it is necessary to connect inter-board terminals between general substrates. Japanese Patent Laid-Open No. 2002-100000 does not mention anything about the connection of the terminals between the boards.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and its object is to provide a driving device having two or more substrates, which suitably realizes press-fit connection of terminals between substrates. .

The driving device according to the present invention is integrally constructed with a motor (80) including a stator (860) and a rotor (865), and a control unit (10) provided on one axial side of the motor for driving and controlling the motor. ing. This driving device includes a metal motor frame (840), two or more substrates, a resin connector housing (50), a plurality of connector terminals (45), and a plurality of inter-board terminals (43). , one or more resin-made board-to-board terminal binders (63) and one or more pressure-receiving supports (637, 77).

The motor frame is provided at the end on the control unit side in the axial direction of the motor. The two or more boards are provided in layers on the opposite side of the motor frame from the motor. An end board (33) provided on the farthest side from the motor frame It includes the above general substrate (31). Two or more substrates are mounted with electronic components constituting a control unit.

The connector housing has a top plate portion (561) facing the end board, and an outer cylinder portion (562) extending from the outer edge of the top plate portion toward the motor and having an end fixed to the motor or the motor frame. It has a cylindrical shape. The connector housing has one or more connectors (57, 58) on the top plate portion with openings facing the side opposite to the end substrate.

One end of the plurality of connector terminals is electrically connected to the end board by a press-fit method, and the other end is exposed to the frontage of the connector. The plurality of board-to-board terminals are electrically connected between the general board and the end board, and between the general boards when the number of general boards is two or more, by a press-fit method.

The board-to-board terminal binder holds intermediate portions of the board-to-board terminals so as to bind the board-to-board terminals adjacent to each other.

The pressure-receiving supports are provided between the general substrate and the end substrate, and between the general substrates when there are two or more general substrates, and are in contact with the surfaces of the opposing substrates to absorb the load applied during assembly. receive.

In the present invention, both ends of the plurality of inter-board terminals bundled by the inter-board terminal binder are press-fitted and connected to the board in a state of receiving a press-fitting load from the pressure-receiving support provided between the boards. Therefore, in a driving device including two or more substrates, it is possible to efficiently realize press-fit connection with small dimensional variation and stable quality.

1 is a schematic configuration diagram of an electric power steering device to which a driving device is applied; FIG. FIG. 2 is a partial cross-sectional view showing a motor portion of the drive device; The III direction arrow directional view of FIG. 4 is a schematic cross-sectional view of the control unit section according to the first embodiment; FIG. FIG. 5 is an enlarged schematic cross-sectional view viewed from the direction of arrow V in FIG. 4 ; (a) A plan view of a connector terminal binder and (b) an end substrate. (a) A board-to-board terminal binder of one embodiment, (b) a plan view of a general board. FIG. 11 is a plan view of an inter-board terminal binder of another embodiment; FIG. 7(a), an expanded view of the inter-board terminal binder in the IX direction of FIG. FIG. 5 is a schematic cross-sectional view of a control unit section according to the second embodiment; FIG. 6 is an enlarged schematic cross-sectional view corresponding to FIG. 5 of the control unit section according to the third embodiment; The schematic cross section of the control unit part by a reference form. FIG. 2 is a plan view of an end board showing mounting positions of inter-board connection components;

A plurality of embodiments of the driving device according to the present invention will be described below with reference to the drawings. In a plurality of embodiments, substantially the same configurations are denoted by the same reference numerals, and descriptions thereof are omitted. The first to third embodiments are collectively referred to as "this embodiment". The drive device of the present embodiment is applied, for example, as a steering assist motor for an electric power steering device, and is integrally configured with a motor and a control unit that drives and controls the motor.

[Configuration of electric power steering device]
A schematic configuration of the electric power steering device 99 will be described with reference to FIG. Although FIG. 1 shows a rack-assist type electric power steering apparatus, the driving apparatus 800 of the present embodiment can also be applied to a column-assist type electric power steering apparatus. A steering system 90 including an electric power steering device 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 99, and the like.

A steering shaft 92 to which a steering wheel 91 is connected is provided with a torque sensor 93 for detecting steering torque. A pinion gear 96 that meshes with a rack shaft 97 is provided at the tip of the steering shaft 92 . When the driver rotates the steering wheel 91 , the rotary motion of the steering shaft 92 is converted into linear motion of the rack shaft 97 by the pinion gear 96 . A pair of wheels 98 connected to both ends of the rack shaft 97 are steered to an angle corresponding to the amount of displacement of the rack shaft 97 .

The electric power steering device 99 includes a drive device 800 in which the motor 80 and the control unit 10 are integrated, a reduction gear 89 that reduces the speed of rotation of the motor 80 and transmits it to the rack shaft 97, and the like. The motor 80 is a two-system three-phase brushless motor having two sets of three-phase windings. The control unit 10 has at least a "dual driving system" configuration capable of supplying power to two sets of three-phase windings by two systems of inverter circuits. The inverter circuit of the control unit 10 supplies three-phase AC power converted from DC power, so that the motor 80 outputs steering assist torque.

A vehicle system connector 57 of the control unit 10 is supplied with DC power from a vehicle power source 905 and receives and inputs/outputs communication signals with a vehicle communication network (“CAN” in the figure) 906 . A sensor signal detected by the torque sensor 93 is input to the signal system connector 58 via a harness 94 . In this manner, the vehicle system connector 57 and the signal system connector 58 are configured as connectors having different frontages.

[Configuration of drive device]
The overall configuration of the driving device 800 will be described with reference to FIGS. 2 and 3. FIG. A direction parallel to the rotation axis O of the motor 80 shown in FIG. 2 is defined as an "axial direction", and a view seen from the upper side of FIG. 2 in the axial direction is called a plan view. The control unit 10 is provided on one side of the motor 80 in the axial direction. In other words, the driving device 800 has a so-called "mechanical and electrical integrated type" configuration.

The motor 80 has a motor case 830, a motor frame 840, a stator 860, a rotor 865, and the like. The motor case 830 is formed in a substantially bottomed cylindrical shape including a bottom portion 831 and a cylindrical portion 832, and the control unit 10 is provided on the opening side. A groove-forming wall 834 having a small thickness is formed at the opening-side end of the cylindrical portion 832 with a stepped portion 833 interposed therebetween.

The stator 860 is fixed inside the cylindrical portion 832 of the motor case 830 and has three-phase motor windings 880 wound thereon. A rotating magnetic field is formed in the stator 860 by controlling the energization of the motor windings 880 by the control unit 10 . The rotor 865 is provided inside the stator 50 and has a shaft 870 fixed at its center. The shaft 870 is rotatably supported by a front bearing 871 held on the bottom 831 of the motor case 830 and a rear bearing 872 held on the motor frame 840 .

The rotor 865 is provided with a plurality of permanent magnets 867 on the outer circumference of the rotor core 866 . Rotor 865 rotates around shaft 870 due to a rotating magnetic field formed in stator 860 . A sensor magnet 875 for detecting a rotation angle is provided at the end of the shaft 870 on the control unit 10 side.

The motor frame 840 is made of aluminum alloy or the like, and has a frame portion 841, a flange portion 842, a heat sink 845, and the like. The frame portion 841 is press-fitted inside the motor case 830 . A flange portion 842 formed on the outer periphery of the frame portion 841 abuts on the stepped portion 833 of the motor case 830 . A seal groove 843 filled with an adhesive is formed in an annular space defined by the outer wall of the frame portion 841, the control unit 10 side surface of the flange portion 842, and the inner wall of the groove forming wall 834 of the motor case 830. .

The connector housing 50 is made of a resin material such as PBT, and has a bottomed tubular shape having a top plate portion 561 and an outer tubular portion 562 . A convex portion 563 protruding in the axial direction is annularly formed at the tip of the outer cylindrical portion 562 . The outer cylindrical portion 562 is fixed to the motor 80 or the motor frame 840 by inserting the convex portion 563 into the seal groove 843 . The top plate portion 561 is provided with connectors 57 and 58 whose frontage faces the side opposite to the motor 80 .

FIG. 3 shows one arrangement example of the connectors 57 and 58. As shown in FIG. Although FIG. 3 is a view taken in the direction of arrow III in FIG. 2, the scale is not the same as that in FIG. (a) and (b) are drawn to match the scale. The horizontal direction in FIG. 3 defines the x-axis, and the vertical direction defines the y-axis. The x-axis and y-axis are referenced in the illustration of board-to-board terminal binder 63 and connector terminal binder 65 .

The vehicle system connector 57 and the signal system connector 58 may be redundantly provided in two sets as shown in FIG. 3, or may be provided in one set in another arrangement example. The configuration in which two pairs of connectors 57 and 58 are provided is mainly employed in a "complete two-system" driving device in which two systems of inverter circuits are connected to separate power sources and various signals are redundantly input/output. be. On the other hand, in a "two drive system" drive device in which two systems of inverter circuits are connected in parallel to a common power source and various signals are shared between the systems, one set of connectors is mainly provided. Since the present embodiment does not refer to items for each system, the same "57" and "58" are attached to the connectors of the two systems in FIG. 3 without distinguishing between them.

The vehicle system connector 57 is connected to two power supply terminals 45p including a positive power supply terminal connected to the positive terminal of the vehicle power supply 905 and a ground terminal connected to the ground, and a vehicle communication network 906 such as CAN. For example, five communication terminals 45c are provided. The terminal 45p for power supply through which a large current flows has a connection portion with a harness formed in a prism shape. The signal system connector 58 is provided with, for example, six sensor terminals 45 s connected to the harness 94 from the torque sensor 93 . The symbols "45p", "45c", and "45c" indicating the types of the connector terminals 45 are used only in FIG. In the figures after FIG. 4 , they are uniformly referred to as “connector terminals 45 ” without distinguishing their uses.

The connector housing 50 accommodates two or more substrates on which electronic components constituting the control unit 10 are mounted. Two or more substrates are provided in layers on the opposite side of the motor frame 840 to the motor 80 (upper side in FIG. 2).

Next, the configuration of the control unit of each embodiment will be described in order. As for the reference numerals of the control units of the first to third embodiments, the embodiment number is attached to the third digit following "10". The first to third embodiments comprise two substrates. Configurations with three or more substrates are referred to as other embodiments.

(First embodiment)
The configuration of the control unit 101 of the first embodiment will be described with reference to FIGS. 4 to 9. FIG. FIG. 4 shows a schematic cross-sectional view of the whole, and FIG. 5 shows an enlarged schematic cross-section of the portion surrounded by the two-dot chain line in FIG. 6A, 6B, 7A, and 7B are plan views of the connector terminal binder 65, the end substrate 33, the inter-board terminal binder 63, and the general substrate 31, respectively. FIG. 8 shows a plan view of an inter-board terminal binder 63 of another embodiment, and FIG. 9 shows an exploded view of the inter-board terminal binder 63. As shown in FIG.

As shown in FIG. 4, two substrates, a general substrate 31 and an end substrate 33, are provided in order from the motor frame 840 side. In this specification, the names are distinguished solely by the layout of the board, regardless of the functions of the electronic components mounted on the board. The board farthest from the motor frame 840, that is, the board closest to the connectors 57 and 58 is called an "end board", and one or more boards other than the end board are called "general boards".

In the first to third embodiments having two substrates, one general substrate 31 and one end substrate 33 are provided. For example, an inverter circuit that energizes the motor windings 42 is mounted on the general substrate 31 . Components such as a filter circuit and a communication driver are mounted on the end substrate 33 .

As shown in FIG. 7B, the general board 31 is formed with screw holes 341 and motor terminal holes 342 . The general board 31 is fixed to the motor frame 840 with screws 41 and connected to the motor terminals 42 connected to the motor windings 880 .

As shown in FIGS. 6(b) and 7(b), inter-substrate terminal holes 343 are formed in the general substrate 31 and the end substrate 33 along the outer periphery thereof. A plurality of inter-board terminals 43 are electrically connected between the general board 31 and the end board 33 by a press-fit method. FIG. 4 shows only three left and right inter-board terminals 43 among a large number of inter-board terminals 43 . As shown in FIG. 6(b), connector terminal holes 345 corresponding to the four connectors 57 and 58 are formed in the end substrate 33 near the center.

That is, in projection in the axial direction of the motor 80 , the plurality of board-to-board terminals 43 are arranged in a radially outer region with respect to the plurality of connector terminals 45 . Since the connectors 57 and 58 are provided near the center of the top plate portion 561 of the connector housing 50, the plurality of connector terminals 45 are inevitably arranged in the central region. Therefore, by arranging the plurality of inter-board terminals 43 in the radially outer region, the mounting space of the boards 31 and 33 can be effectively used.

One end of the connector terminal 45 is electrically connected to the end substrate 33 by a press-fit method, and the other end is exposed to the openings of the connectors 57 and 58 . In this embodiment, the configuration in which the plurality of connector terminals 45 are inserted through the bottoms of the frontages of the connectors 57 and 58 is not limited. In the configuration example shown in FIG. 4 and the like, the plurality of connector terminals 45 are not insert-molded or outsert-molded in the connector housing 50 before the control unit 101 is assembled, and are separated from the connector housing 50 . Therefore, one end of the plurality of connector terminals 45 is first connected to the end substrate 33, and then exposed to the openings of the connectors 57 and 58 in the final assembly process. 4 shows five connector terminals 45 for the vehicle system connector 57 and two connector terminals 45 for the signal system connector 58 according to the cross-sectional line of FIG.

FIG. 5 shows a configuration example of electrical connection between the board-to-board terminals 43 and the general board 31 and the end board 33 by a press-fit method. The connection point between one end of the connector terminal 45 and the end substrate 33 is the same. Regarding "connection between a terminal and a substrate" in the following specification, if it is obvious that it means an electrical connection, the description of "electrically" will be omitted as appropriate. Terminal holes 343 of the general substrate 31 and the end substrate 33 are provided with connecting portions 38 such as via holes. The connection portion 38 is electrically connected to connection portions of electronic components and other terminals via conductive patterns, bus bars, and the like (not shown).

A press-fit portion 48 elastically deformable is press-fitted into the terminal hole 345 at the end portion of the inter-board terminal 43 for press-fit connection. The shape of the press-fit portion 48 in which a through-hole is formed at the end of the terminal is disclosed in FIGS.

In the configuration in which the terminals 43 and the substrates 31 and 33 are electrically connected by press-fit connection, since soldering is not required, high-temperature heating is not required, and energy consumption and CO ₂ emissions are reduced. In addition, the prohibition area on the substrates 31 and 33 where the element cannot be mounted due to soldering is reduced, and the effective mounting area is increased.

The resin-made inter-board terminal binder 63 holds intermediate portions of the plurality of inter-board terminals 43 so as to bundle the plurality of inter-board terminals 43 adjacent to each other. By bundling the plurality of inter-board terminals 43 with the inter-board terminal binder 63, the relative positional accuracy of the plurality of inter-board terminals 43 is ensured.

Here, a plurality of inter-board terminals 43 adjacent to each other within a specific range is defined as "a group of inter-board terminals". For example, in FIGS. 6B and 7B, a plurality of inter-board terminals 43 arranged along the left outer peripheries of the end board 33 and the general board 31 form "a certain group of inter-board terminals". A plurality of inter-board terminals 43 arranged along the right outer peripheries of the end board 33 and the general board 31 form "another group of inter-board terminals".

A board-to-board terminal binder 63R of the embodiment shown in FIG. 7(a) is integrally formed in an annular shape, and binds two groups of board-to-board terminals 43 together. Board-to-board terminal binders 63A and 63B of another embodiment shown in FIG. In FIG. 9, the reference numerals of the inter-board terminal binders 63R, 63A, and 63B of each embodiment are collectively denoted as "63". As shown in FIG. 9, the board-to-board terminal binder 63 has, for example, a pin header type configuration.

As shown in FIGS. 4, 5, 9, etc., the inter-board terminal binder 63 includes pressure receiving ribs 637 protruding from the surfaces of the body portion 635 on the general substrate 31 side and the end substrate 33 side toward the substrates 31 and 33. are integrally formed. The pressure-receiving rib 637 abuts against the surfaces of the substrates 31 and 33 facing each other, and functions as a "pressure-receiving support" that receives the load applied during assembly.

As shown in FIG. 5, the height Hs between both ends of the pressure-receiving rib 637 is set equal to the distance from the upper surface 312 of the general substrate 31 to the lower surface 332 of the end substrate 33 . As shown on the left side of FIG. 5, a pair of pressure-receiving ribs 637 abutting on both substrates 31 and 33 may be provided at the same position in axial projection. Alternatively, as shown on the right side of FIG. 5, pressure-receiving ribs 637 abutting on both substrates 31 and 33 may be provided at different positions when viewed in axial projection. In the example shown in FIGS. 7 and 8, the pressure receiving ribs 637 are provided at a total of four locations corresponding to both sides in the circumferential direction of the inter-board terminals 43 of each group.

As shown in FIG. 6A, the connector terminal binder 65 made of resin holds intermediate portions of the plurality of connector terminals 45 so as to bundle a group of connector terminals 45 corresponding to the connectors 57 and 58 . In addition, a meat steal 649 may be provided in the lean portion. By bundling the plurality of connector terminals 45 with the connector terminal binder 65, the relative positional accuracy of the plurality of connector terminals 45 is ensured. The connector terminal binder 65 illustrated in FIG. 6(a) consists of two connector terminal binders 65h1 and 65h2. Each of the connector terminal binders 65h1 and 65h2 commonly bundles a plurality of connector terminals 45 corresponding to the adjacent vehicle system connector 57 and signal system connector 58 for each system. In addition, four connector terminal binders may be provided so as to bundle a plurality of connector terminals 45 for each of the vehicle system connector 57 and the signal system connector 58 of each system. Alternatively, one connector terminal binder 65 may commonly bundle all the connector terminals 45 of the two systems.

Returning to FIG. 4 , the resin connector housing 50 has a bottomed tubular shape in which an outer tubular portion 562 extends from the outer edge of a top plate portion 561 facing the end substrate 33 toward the motor 80 . A convex portion 563 formed at the tip of the outer cylindrical portion 562 is inserted into an annular seal groove 843 filled with an adhesive. When the connector housing 50 is assembled, the load receiving portion 564 provided at the end of the outer cylindrical portion 562 contacts the frame outer edge portion 844 of the motor frame 840 .

As described above with reference to FIG. 3 , the top plate portion 561 is provided with the connectors 57 and 58 whose frontage faces the side opposite to the end substrate 33 . At the bottom of the frontage of the connectors 57 and 58, terminal insertion holes 54 are formed through which the respective connector terminals 45 can be inserted, for example, with a clearance fit. Even if there is a gap around the outer periphery of the connector terminal 45, there is no risk of water or foreign matter entering when the harness is inserted into the connectors 57 and 58. FIG.

As described above, in the first embodiment, the pressure-receiving rib 637 formed integrally with the inter-board terminal binder 63 functions as "a pressure-receiving support provided between the boards 31 and 33". Both ends of the plurality of inter-board terminals 43 bundled by the inter-board terminal binder 63 are press-fitted and connected to the boards 31 and 33 in a state of receiving a press-fitting load from the pressure receiving ribs 637 . Therefore, in the drive device 800 having a two-board configuration, it is possible to efficiently realize press-fit connection with small dimensional variations and stable quality.

Further, since the pressure receiving rib 637 functioning as a pressure receiving support is formed integrally with the inter-board terminal binder 63, the number of parts and the number of assembly steps can be reduced.

Furthermore, in the first embodiment, a plurality of connector terminals 45 adjacent to each other are bundled by the connector terminal binder 65 to improve relative positional accuracy, so that the connector housing 50 can be easily assembled by blind connection.

In addition, a load receiving portion 564 is provided at the end of the outer cylindrical portion 562 of the connector housing 50 . This prevents stress from concentrating on the connecting portion between the connector terminal 45 and the end substrate 33 when the connector housing 50 is assembled.

(Second embodiment)
Next, with reference to FIG. 10, the control unit 102 of the second embodiment will be described. In the second embodiment, a configuration similar to that of the pressure receiving ribs 637 of the inter-board terminal binder 63 is also applied to the connector terminal binder 65 . The connector terminal binder 65 is integrally formed with restricting ribs 657 projecting from the end substrate 33 side and top plate portion 561 side surfaces of the body portion 655 toward the end substrate 33 and the top plate portion 561 . The restricting ribs 657 abut against the facing surfaces of the end substrate 33 and the top plate portion 561 to restrict the assembly position of the connector housing 50 . The height between both ends of the regulating rib 657 is set equal to the distance from the upper surface of the end substrate 33 to the lower surface of the top plate portion 561 .

Here, in a configuration in which the connector terminals 45 are fitted into the terminal insertion holes 54 with a clearance fit, the load during assembly of the connector housing 50 is relatively low. Therefore, the main function of the restricting ribs 657 is to restrict the assembly position of the connector housing 50 rather than to receive the load applied during assembly. In the second embodiment, the connector terminal binder 65 is provided with the restricting ribs 657, so that the connector housing 50 can be assembled easily and accurately by blind connection.

(Third embodiment)
A control unit 103 according to the third embodiment will be described with reference to FIG. In the third embodiment, one or more pressure receiving supports 77 are provided separately from the inter-board terminal binder 63 . The pressure-receiving support 77 abuts against the surfaces of the substrates 31 and 33 facing each other and receives a load applied during assembly. The height Hs of the pressure receiving support 77 is set equal to the distance from the top surface 312 of the general substrate 31 to the bottom surface 332 of the end substrate 33 . For example, the pressure receiving support 77 is arranged around the inter-board terminal binder 63 . The pressure-receiving support 77 may be made of metal or resin, and the method of fixing it to the substrates 31 and 33 may be appropriately set.

In the third embodiment, as in the first embodiment, a plurality of inter-board terminals bundled by the inter-board terminal binder 63 are subjected to a press-fit load by a pressure receiving support 77 provided between the boards 31 and 33 . Both ends of 43 are press-fitted and connected to substrates 31 and 33 by a press-fit method. Therefore, in the drive device 800 having a two-board configuration, it is possible to efficiently realize press-fit connection with small dimensional variations and stable quality. In addition, since it has a simple columnar shape, it is possible to easily adapt to changes in the inter-board dimension of the control unit.

(Reference form)
The control unit 108 of the reference form will be described with reference to FIGS. 12 and 13. FIG. In the reference embodiment, a commercially available board-to-board (B-to-B) connector 71 is used in place of the press-fit type board-to-board terminals 43 to electrically connect the general board 31 and the end board 33 without soldering. be done. FIG. 12 shows a state before connection in which the board-to-board connection components attached to the boards 31 and 33 are separated.

The lower part 711 of the board-to-board connector 71 is surface-mounted on the upper surface 312 of the general board 31 , and the upper part 713 is attached to the lower surface 332 of the end board 33 . A plurality of pins 714 of the top part 713 are inserted through holes in the end substrate 33 and electrically connected to a pattern (not shown) on the top surface 333 .

As shown in FIG. 13, the board-to-board connector 71 is located radially outward of the connector terminals 45 in the axial projection of the motor 80, like the board-to-board terminals 43 in the first embodiment. located in the area. The type and number of board-to-board connection components 71 are selected according to the number of usable pins, rating, and the like.

Even in the configuration using the board-to-board connector 71 as in the reference form, since the terminals and the board are electrically connected without soldering, high-temperature heating is not required, and energy consumption and _CO2 emissions are reduced. be done. In addition, the prohibition area on the substrates 31 and 33 where the element cannot be mounted due to soldering is reduced, and the effective mounting area is increased.

(Other embodiments)
(a) The number of general substrates is not limited to one, and two or more substrates may be provided in layers. When there are two or more general boards, a plurality of inter-board terminals 43 are electrically connected between the general boards by a press-fit method. Further, an inter-board terminal binder 63 is provided for bundling a plurality of inter-board terminals 43 connected between general boards. Furthermore, a pressure receiving rib 637 integrally formed with the inter-board terminal binder 63 or a separate pressure receiving support 77 is provided between the general boards.

In the configuration having two or more general boards, the general boards are assembled one by one in order from the lowest general board closest to the motor frame 840 to the uppermost general board immediately below the end board 33 . In the assembling process of each stage, both ends of the plurality of inter-board terminals 43 bundled by the inter-board terminal binder 63 are press-fitted and connected to the board in a state of receiving a press-fitting load from the pressure-receiving rib 637 or the pressure-receiving support 77 . be. Therefore, it is possible to efficiently realize press-fit connection with small dimensional variation and stable quality.

(b) One or more connectors may be provided on the top plate portion 561 of the connector housing 50 . The number of connectors and the use of each connector terminal are not limited to the example of the above embodiment, and may be appropriately set according to needs.

(c) The connection shape of the press-fit method is not limited to that illustrated in the drawings of the above embodiments. For example, as disclosed in FIGS. 10 to 12 of Patent Document 1, a pair of opposing claw portions may be shaped to elastically contact the side surface of the terminal.

(d) As a configuration in which a plurality of connector terminals 45 are inserted through the bottoms of the frontages of the connectors 57 and 58, in addition to the configuration example shown in FIG. It may be an insert or outsert molded configuration. In that case, since the plurality of connector terminals 45 are already bundled, the connector terminal binder 65 does not need to be further provided.

(e) The drive device 800 of the present invention is not limited to a steering assist motor for an electric power steering system, but can be used as a reaction force motor or steering motor for a steer-by-wire system, or any other motor drive device. good too.

As described above, the present invention is by no means limited to the above embodiments, and can be embodied in various forms without departing from the spirit of the present invention.

10 (101-103) ... control unit,
31 ... general substrate, 33 ... end substrate,
43 ... board-to-board terminal, 45 ... connector terminal,
50 ... connector housing,
561 ... top plate portion, 562 ... outer cylinder portion,
57, 58 ... connectors,
637... pressure receiving rib (pressure receiving support), 77... pressure receiving support,
80... Motor, 860... Stator, 865... Rotor.

Claims (5)

A driving device in which a motor (80) including a stator (860) and a rotor (865) and a control unit (10) provided on one axial side of the motor and controlling the driving of the motor are integrally constructed. hand,
a metal motor frame (840) provided at the end on the control unit side in the axial direction of the motor;
An end substrate (33) provided in layers on the opposite side of the motor frame from the motor frame and provided on the farthest side from the motor frame, and one or more general substrates other than the end substrate (33) two or more substrates including substrates (31) on which electronic components constituting the control unit are mounted;
It has a top plate portion (561) facing the end substrate, and an outer cylindrical portion (562) extending from the outer edge of the top plate portion toward the motor and having an end fixed to the motor or the motor frame. a resin-made connector housing (50) having a cylindrical shape with a bottom, and having one or more connectors (57, 58) on the top plate portion with openings facing the side opposite to the end substrate;
a plurality of connector terminals (45), one end of which is electrically connected to the end board in a press-fit manner and the other end of which is exposed to the frontage of the connector;
a plurality of inter-board terminals (43) electrically connected by a press-fit method between the general substrate and the end substrate, and between the general substrates when the number of the general substrates is two or more;
one or more resin-made inter-board terminal binders (63) for holding intermediate portions of the plurality of inter-board terminals so as to bundle the plurality of adjacent inter-board terminals;
A load provided between the general substrate and the end substrate, and between the general substrates in the case where there are two or more general substrates, is in contact with the surfaces of the substrates facing each other, and is applied during assembly. one or more pressure receiving supports (637, 77) receiving
A drive device comprising: 2. The driving device according to claim 1, wherein the inter-board terminal binder is integrally formed with a pressure receiving rib (637) functioning as the pressure receiving support. 3. The driving device according to claim 1, further comprising one or more connector terminal binders (65) made of resin for holding intermediate portions of the plurality of connector terminals so as to bind the plurality of connector terminals adjacent to each other. 4. The connector terminal binder according to claim 3, wherein the connector terminal binder is integrally formed with a restriction rib (657) that abuts against the facing surfaces of the end substrate and the top plate portion and restricts an assembly position of the connector housing. drive. The driving device according to any one of claims 1 to 4, wherein the connector housing is provided with a load receiving portion (564) contacting the motor frame at the end of the outer cylindrical portion.

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