CN219643696U

CN219643696U - Electric actuator

Info

Publication number: CN219643696U
Application number: CN202320186994.5U
Authority: CN
Inventors: 白井宽; 佐藤伦纪
Original assignee: Nidec Tosok Corp
Current assignee: Nidec Powertrain Systems Corp
Priority date: 2022-02-08
Filing date: 2023-02-06
Publication date: 2023-09-05
Anticipated expiration: 2033-02-06
Also published as: JP2023115420A

Abstract

An electric actuator having a structure capable of reducing the number of parts and assembly man-hours, comprising: a rotor rotatable about a central axis; a stator having coils; a circuit board connected to the coil; a housing. The housing has a motor housing portion that houses the rotor and the stator, a circuit board housing portion that houses the circuit board and is disposed on one side in an axial direction of the motor housing portion, and a partition wall that is disposed between the motor housing portion and the circuit board housing portion. The partition wall has a partition wall body portion, a through hole, and a protruding portion. The coil has: a coil main body portion; and a coil lead wire which is led out from the coil main body to one side in the axial direction and is connected to the circuit board. The protrusion has a hooking portion overlapping the through hole when viewed in the axial direction. The circuit board has a hole through which the coil lead wire passes. The coil lead wire passes through the through hole and passes between the through hole and the hooking portion toward one side in the radial direction, and an end portion on one side in the radial direction of the hooking portion is bent toward the hole portion.

Description

Electric actuator

Technical Field

The present utility model relates to an electric actuator.

Background

Electric actuators having a rotor and a stator are known. For example, patent document 1 discloses a structure in which a plurality of components such as a rotor and a stator, a circuit board, and a bus bar, which constitute a motor unit, are respectively incorporated in a housing.

[ Prior Art literature ]

[ patent literature ]

Patent document 1: japanese patent laid-open No. 2020-5431

Disclosure of Invention

In the above-described configuration, it is necessary to assemble the stator, the circuit board, the bus bar unit, and other components into the housing. Therefore, the assembly of the components to the housing is labor-intensive, and therefore, there is a problem in that the assembly man-hour of the electric actuator increases. In addition, a structure for fixing each member to the housing is also required, and there is a problem that the number of members of the electric actuator increases.

In view of the above, an object of one embodiment of the present utility model is to provide an electric actuator having a structure capable of reducing the number of components and the man-hours of assembly.

One embodiment of the electric actuator of the present utility model includes: a rotor rotatable about a central axis extending in an axial direction; a stator having a coil and facing the rotor with a gap therebetween; a circuit board electrically connected to the coil; and a housing that houses the rotor, the stator, and the circuit board therein. The housing has: a motor housing unit that houses the rotor and the stator inside; a circuit board housing section that houses the circuit board therein and is disposed on one side in an axial direction of the motor housing section; and a partition wall disposed between the motor housing portion and the circuit board housing portion in the axial direction. The partition wall has: a partition wall main body portion that axially separates the motor housing portion and the circuit board housing portion; a through hole extending in a radial direction and penetrating the partition wall main body in an axial direction; and a protrusion portion disposed between the partition wall body portion and the circuit board in an axial direction. The coil has: a coil body portion wound around the stator; and a coil lead wire which is led out from the coil body portion to one side in the axial direction and is connected to the circuit board. The protruding portion has a hooking portion that is disposed so as to overlap the through hole when viewed in the axial direction. The circuit board has a hole portion penetrating the circuit board and through which the coil lead wire passes in the axial direction. The coil lead-out wire passes through the through-hole in the axial direction and passes between the through-hole and the hooking portion toward the radial side in the axial direction, and an end portion on the radial side of the hooking portion is bent toward the hole portion.

Preferably, the through hole has: an insertion hole penetrating the partition wall body in an axial direction; and a long hole extending from the insertion hole to one side in the radial direction, the long hole having a smaller width in a direction orthogonal to the radial direction than a width in a direction orthogonal to the radial direction of the insertion hole, the long hole penetrating the partition wall main body portion in the axial direction, the hooking portion being disposed so as to overlap with the long hole when viewed in the axial direction, the coil lead-out wire passing through at least either the insertion hole or the long hole in the axial direction.

Preferably, the long hole extends radially inward from the insertion hole.

Preferably, the inner surface of the insertion hole is provided with a tapered guide surface having a diameter that decreases toward one axial side.

Preferably, the protrusion has a connecting portion protruding from the partition wall body portion to one side in the axial direction, and the hooking portion protrudes from an end portion of the connecting portion on one side in the axial direction in a direction orthogonal to the radial direction.

Preferably, an end portion of the hooking portion on one side in a radial direction overlaps the hole portion when viewed in the axial direction.

Preferably, the hole is arranged at a position not overlapping the coil body when viewed in the axial direction.

Preferably, a groove recessed toward one axial side and extending in the radial direction is provided on the surface of the hooking portion facing the other axial side.

Preferably, it comprises: a transmission mechanism which is housed in the casing and is connected to the rotor; and an output shaft that transmits power of the rotor via the transmission mechanism and rotates around an output axis parallel to the central axis, wherein the transmission mechanism makes a rotational speed of the output shaft smaller than a rotational speed of the rotor.

According to one aspect of the present utility model, in an electric actuator, the number of components and the man-hour for assembly can be reduced.

Drawings

Fig. 1 is a perspective view showing an electric actuator of an embodiment.

Fig. 2 is a cross-sectional view showing an electric actuator of an embodiment.

Fig. 3 is a perspective view showing a part of an electric actuator of an embodiment.

Fig. 4 is a perspective view showing a partition wall of an embodiment.

Fig. 5 is a cross-sectional view showing a protrusion portion of an embodiment.

Fig. 6 is a sectional view showing an assembly sequence of the electric actuator of the embodiment.

Fig. 7 is a sectional view showing an assembly sequence of the electric actuator of the embodiment.

Fig. 8 is a sectional view showing an assembly sequence of the electric actuator of the embodiment.

Fig. 9 is a sectional view showing an assembly sequence of the electric actuator of the embodiment.

(symbol description)

1 … electric actuator; 11 … shell; 13 … motor housing; 14 … circuit substrate receiving portion; 19 … dividing walls; 19a … partition wall body portion; 19b … through holes; 19c … insert holes; 19c1 … guide surfaces; 19d … long holes; 19f … projections; 19g … connection; 19h … hook; 19h1 … slots; 41 … rotor; 43 … stator; 43c … coil; 43d … coil body; 43e … coil lead; 50 … reduction mechanism (transmission mechanism); 61 … output shaft; 70 … circuit substrate; 70a … aperture portion; j1 … central axis; j3 … output axis.

Detailed Description

In the following description, X-axis, Y-axis, and Z-axis are appropriately shown in the drawings. The direction parallel to the Z axis is referred to as "up-down direction Z". The Z axis shows a direction in which a central axis J1 of the electric actuator 1 of the embodiment described below extends. The central axis J1 shown in each figure is a virtual axis. In the following description, a direction in which the central axis J1 extends, that is, a direction parallel to the Z axis is referred to as an "axial direction". The radial direction centered on the central axis J1 is simply referred to as "radial direction". The circumferential direction centered on the central axis J1 is simply referred to as "circumferential direction". The side toward which the arrow of the Z axis in the axial direction is directed (+z side) is referred to as "axial side" or "upper side". The side opposite to the side toward which the arrow of the Z axis faces in the axial direction (-Z side) is referred to as "axial other side" or "lower side".

The circumferential direction is shown by arrow θ in each figure. The side toward which the arrow θ in the circumferential direction is directed is referred to as "circumferential side". The side opposite to the side toward which the arrow θ faces in the circumferential direction is referred to as "the circumferential direction other side". The circumferential direction side is a side which advances clockwise around the central axis J1 when viewed from the axial direction side (+z side). The other circumferential side is a side advancing counterclockwise about the central axis J1 when viewed from the one axial side.

The electric actuator 1 of the present embodiment shown in fig. 1 is mounted on a vehicle. More specifically, the electric actuator 1 is mounted on, for example, a drive-by-wire parking type actuator device that is driven based on a shift operation by a driver of a vehicle. As shown in fig. 2, the electric actuator 1 includes a motor unit 40, a reduction mechanism (transmission mechanism) 50, an output unit 60, a housing 11, and a control device 7.

Hereinafter, each part of the electric actuator 1 will be described based on the posture of the electric actuator 1 in the assembly process. Specifically, each portion of the electric actuator 1 will be described with respect to a case where the central axis J1 of the motor portion 40 is arranged parallel to the up-down direction Z. The posture of the electric actuator 1 when mounted on the vehicle is not particularly limited, and is not limited by the names such as the vertical direction Z used in the following description.

As shown in fig. 2, the motor portion 40 has a rotor 41, a first bearing 44a, a second bearing 44b, a third bearing 44c, a stator 43, and a first sensor magnet 45. That is, the electric actuator 1 includes a rotor 41 and a stator 43. In the present embodiment, the first bearing 44a is a slide bearing. The second bearing 44b and the third bearing 44c are, for example, ball bearings.

As shown in fig. 2, the rotor 41 is rotatable about a central axis J1 extending in the axial direction. The rotor 41 has a motor shaft 42, a rotor core 41a, and a magnet 41b.

The motor shaft 42 is cylindrical and extends in the axial direction around the central axis J1. The motor shaft 42 is supported rotatably about the central axis J1 by a first bearing 44a and a second bearing 44 b. The motor shaft 42 is disposed below the control device 7. The motor shaft 42 has a first portion 42a, a flange portion 42b, a second portion 42c, a third portion 42d, and a fourth portion 42e.

The first portion 42a is an upper side portion of the motor shaft 42. A rotor core 41a is fixed to the outer peripheral surface of the first portion 42 a. The upper end of the first portion 42a protrudes further upward than the rotor core 41a. The lower end of the first portion 42a protrudes further downward than the rotor core 41a. A hole 42a1 recessed downward is provided in an upper surface of the first portion 42 a. The hole 42a1 is circular in axial direction with the central axis J1 as the center. An upper outer peripheral surface of the first portion 42a contacts an inner peripheral surface of the first bearing 44 a. Thus, the portion of the motor shaft 42 above the rotor core 41a is supported rotatably about the central axis J1.

The flange 42b has a disk shape centered on the central axis J1. The plate surface of the flange 42b faces in the axial direction. An upward facing surface of the flange portion 42b is connected to a lower end of the first portion 42 a. The outer diameter of the flange portion 42b is set larger than the outer diameter of the first portion 42 a. The downward-facing surface of the flange portion 42b supports the upward-facing surface of the inner race of the third bearing 44c. Thereby, the axial position of the third bearing 44c is determined.

The second portion 42c is cylindrical and protrudes downward from the lower end of the flange 42 b. The second portion 42c has an outer diameter smaller than that of the flange portion 42 b. A third bearing 44c is fixed to the second portion 42 c. More specifically, an inner ring of the third bearing 44c is fitted to the outer peripheral surface of the second portion 42 c. The downward-facing surface of the second portion 42c supports an upward-facing surface of an eccentric member 50a described later. Thereby, the axial position of the eccentric member 50a is determined.

The third portion 42d is cylindrical and protrudes downward from the lower end of the second portion 42 c. The third portion 42d has an outer diameter smaller than the outer diameter of the second portion 42 c. An eccentric member 50a described later is fixed to the outer peripheral surface of the third portion 42 d. The downward-facing surface of the third portion 42d supports the upward-facing surface of the inner race of the second bearing 44 b. Thereby, the axial position of the second bearing 44b is determined.

The fourth portion 42e is cylindrical and protrudes downward from the lower end of the third portion 42 d. The outer diameter of the fourth portion 42e is smaller than the outer diameter of the third portion 42 d. The fourth portion 42e is a lower side portion of the motor shaft 42. A second bearing 44b is fixed to the fourth portion 42 e. More specifically, an inner ring of the second bearing 44b is fitted and fixed to the outer peripheral surface of the fourth portion 42 e. Thus, the portion of the motor shaft 42 below the rotor core 41a is supported rotatably about the central axis J1.

The rotor core 41a is fixed on the outer peripheral surface of the first portion 42a of the motor shaft 42. The rotor core 41a is cylindrical with the central axis J1 as the center.

The magnet 41b is buried and held in the rotor core 41 a. Although not shown, in the present embodiment, a plurality of magnets 41b are provided at intervals in the circumferential direction.

The stator 43 is located radially outward of the rotor 41. More specifically, the stator 43 is disposed to face the radially outer side of the rotor core 41a with a gap therebetween. The stator 43 has a ring shape surrounding the radially outer side of the rotor core 41 a. The stator 43 has a stator core 43a, an insulator 43b, and a plurality of coils 43c.

The stator core 43a has an annular shape surrounding the radially outer side of the rotor 41. The outer peripheral surface of the stator core 43a is fixed to the inner peripheral surface of the motor housing portion 13 of the housing 11, which will be described later.

The plurality of coils 43c are wound around teeth, not shown, of the stator core 43a via the insulator 43 b. The plurality of coils 43c each have a coil body 43d and a coil lead 43e. The coil body 43d is wound around a tooth, not shown, of the stator core 43a. The coil main body 43d is fixed to the stator core 43a.

The coil lead wire 43e is a portion led out from the coil body 43d to the upper side, i.e., to one side in the axial direction. One end of the coil lead wire 43e is connected to the coil body 43 d. The other end of the coil lead wire 43e is connected to a circuit board 70 described later. Thus, the circuit board 70 is electrically connected to the coil 43 c. The process of connecting the coil lead wire 43e and the circuit board 70 will be described later.

The first sensor magnet 45 is fixed to the hole portion 42a1 of the motor shaft 42. The upper end of the first sensor magnet 45 is located above the motor shaft 42. The first sensor magnet 45 is cylindrical with the central axis J1 as the center. The surface of the first sensor magnet 45 facing upward faces the control device 7 with a gap therebetween in the axial direction. N and S poles are alternately arranged on the first sensor magnet 45 in the circumferential direction.

The speed reducing mechanism (transmission mechanism) 50 is disposed below the rotor core 41a and the stator 43. The speed reducing mechanism 50 is coupled to the motor shaft 42. That is, the speed reducing mechanism (transmission mechanism) 50 is coupled to the rotor 41. The reduction mechanism 50 has an eccentric member 50a, an external gear 51, an internal gear 52, an output gear 53, and a plurality of protruding portions 54.

The eccentric member 50a is annular about an eccentric axis J2 eccentric to the central axis J1. The eccentric member 50a is fixed to the outer peripheral surface of the third portion 42 d. Thereby, the reduction mechanism 50 is coupled to the motor shaft 42. The eccentric axis J2 is an imaginary axis parallel to the central axis J1. When the motor shaft 42 rotates around the central axis J1, the eccentric member 50a revolves around the central axis J1 in the circumferential direction.

The external gear 51 is in the shape of a circular ring extending in the radial direction of the eccentric axis J2 around the eccentric axis J2. The plate surface of the external gear 51 faces in the axial direction. An external gear portion 51b is provided on the outer side surface of the external gear 51. The external gear portion 51b has a plurality of tooth portions arranged along the outer periphery of the external gear 51. The inner side surface of the external gear 51 contacts the outer peripheral surface of the eccentric member 50 a. Thereby, the external gear 51 can rotate about the eccentric axis J2 with respect to the eccentric member 50 a. The external gear 51 has a plurality of hole portions 51a.

The hole 51a penetrates the external gear 51 in the axial direction. The plurality of hole portions 51a are arranged at equal intervals throughout the circumference along the circumference centered on the eccentric axis J2. The hole 51a is circular in axial view. The inner diameter of the hole 51a is larger than the outer diameter of the protruding portion 54. The hole 51a may be a hole having a bottom.

The internal gear 52 is located radially outward of the external gear 51, and has a ring shape surrounding the external gear 51. The internal gear 52 has an annular shape centered on the central axis J1. The internal gear 52 is fixed to a second bearing holding member 48 described later. An inner gear portion 52b is provided on the inner side surface of the inner gear 52. The internal gear portion 52b has a plurality of tooth portions arranged along the inner periphery of the internal gear 52. The internal gear portion 52b meshes with the external gear portion 51 b. That is, the internal gear 52 meshes with the external gear 51.

The output gear 53 is disposed above the external gear 51 and the internal gear 52. The output gear 53 is annular and centered on the central axis J1. The inner peripheral surface of the output gear 53 is fixed to the outer peripheral surface of the outer race of the third bearing 44 c. Thereby, the output gear 53 can rotate around the central axis J1. An output gear portion 53a is provided on the outer side surface of the output gear 53. The output gear portion 53a has a plurality of teeth arranged along the outer periphery of the output gear 53. The output gear portion 53a is engaged with a drive gear portion 62a of a drive gear 62 described later.

The plurality of protruding portions 54 protrude from the output gear 53 toward the external gear 51 in the axial direction. Each of the protruding portions 54 has a cylindrical shape protruding downward from the lower surface of the output gear 53. The protruding portions 54 are arranged at equal intervals throughout the circumference in the circumferential direction. Each protruding portion 54 is inserted into the hole portion 51a from the upper side. The outer peripheral surface of each protruding portion 54 is inscribed in the inner surface of each hole 51 a. Each protruding portion 54 supports the external gear 51 via the inner surface of the hole portion 51a so as to be swingable around the central axis J1.

The output unit 60 is a portion that outputs the driving force of the electric actuator 1. As shown in fig. 2, the output unit 60 is disposed radially outward of the motor unit 40. The output section 60 has an output shaft 61, a drive gear 62, a fourth bearing 65a, a fifth bearing 65b, a second sensor magnet 63, and a magnet holder 64.

The output shaft 61 is cylindrical and extends in the axial direction about an output axis J3 parallel to the central axis J1. That is, the output shaft 61 extends in the same direction as the motor shaft 42. The output shaft 61 is disposed below the control device 7. The output shaft 61 is coupled to the motor shaft 42 via the reduction mechanism 50. Thereby, the power of the rotor 41 is transmitted to the output shaft 61 via the reduction mechanism (transmission mechanism) 50. The output shafts 61 are arranged radially outward of the motor shaft 42 separately from each other. In the following description, a radial direction centering on the output axis J3 is referred to as an "output radial direction". The output radial direction is the radial direction of the output shaft 61. The output shaft 61 has a base portion 61a, a small diameter portion 61b, a large diameter portion 61c, and an output shaft portion 61d.

The base 61a is cylindrical and extends in the axial direction around the output axis J3. The base 61a overlaps the stator 43 as viewed in the radial direction. The upper portion of the base 61a has a tapered shape in which the outer diameter decreases toward the upper side. The base 61a passes through the fourth bearing 65a in the axial direction. The outer peripheral surface of the base 61a is in contact with the inner peripheral surface of the fourth bearing 65a. Thereby, the upper portion of the output shaft 61 is supported rotatably about the output axis J3.

The small diameter portion 61b is cylindrical and protrudes upward from the base portion 61a, centering on the output axis J3. The small diameter portion 61b has an outer diameter smaller than that of the base portion 61 a. The upper end of the small diameter portion 61b is the upper end of the output shaft 61.

The large diameter portion 61c is cylindrical with the output axis J3 as the center, and protrudes downward from the base portion 61 a. The large diameter portion 61c has an outer diameter larger than that of the base portion 61 a. A drive gear 62 is fixed to the outer peripheral surface of the large diameter portion 61 c.

The output shaft portion 61d is cylindrical with the output axis J3 as the center, and protrudes downward from the large diameter portion 61 c. The outer diameter of the output shaft portion 61d is smaller than the outer diameter of the large diameter portion 61 c. The output shaft portion 61d axially passes through the fifth bearing 65b. The outer peripheral surface of the output shaft portion 61d is in contact with the inner peripheral surface of the fifth bearing 65b. Thereby, the lower portion of the output shaft 61 is supported rotatably about the output axis J3.

The output shaft portion 61d opens downward. A plurality of spline grooves are provided in the circumferential direction on the inner circumferential surface of the output shaft portion 61 d. A driven shaft, not shown, to which the driving force of the electric actuator 1 is output, is inserted into and coupled to the inner peripheral surface of the output shaft portion 61 d. More specifically, the spline portion provided on the outer peripheral surface of the driven shaft is fitted into the spline groove provided on the inner peripheral surface of the output shaft 61, whereby the output shaft 61 and the driven shaft are coupled. Thereby, the electric actuator 1 rotates the driven shaft about the output axis J3. The driven shaft is, for example, a manual shaft in a vehicle. A groove is provided in a lower portion of the outer peripheral surface of the output shaft portion 61d, and an O-ring 91 is fitted into the groove. The O-ring 91 contacts an inner peripheral surface of a protruding cylindrical portion 17c described later and an outer peripheral surface of the output shaft portion 61d, and seals between the second housing member 17 and the output shaft 61.

As shown in fig. 2, the drive gear 62 is fixed to the large diameter portion 61c of the output shaft 61. The drive gear 62 extends radially from the output shaft 61 toward the output gear 53. Although not shown, the drive gear 62 has a substantially fan shape when viewed from the axial direction. The drive gear 62 increases in size in the circumferential direction centering on the output axis J3 as going outward in the output radial direction. The drive gear 62 has a drive gear portion 62a on the outer surface in the output radial direction. The drive gear portion 62a has a plurality of tooth portions arranged along a circumferential direction centered on the output axis J3. The drive gear portion 62a meshes with the output gear portion 53 a. Thereby, the drive gear 62 is connected to the reduction mechanism 50. Accordingly, the driving force of the motor portion 40 is transmitted to the driving gear 62 via the reduction mechanism 50, and the output shaft 61 rotates about the output axis J3.

The magnet holder 64 has a substantially cylindrical shape extending in the axial direction about the output axis J3. The magnet holder 64 is open on both sides in the axial direction. The magnet holder 64 is disposed below the circuit board 70. The lower part of the inner peripheral surface of the magnet holder 64 is fitted to the outer peripheral surface of the small diameter portion 61 b. Thereby, the magnet holder 64 is fixed to the output shaft 61.

In the present embodiment, the fourth bearing 65a and the fifth bearing 65b are sliding bearings, respectively. The fourth bearing 65a is formed in a cylindrical shape that opens upward and downward around the output axis J3. As described above, the inner peripheral surface of the fourth bearing 65a is in contact with the outer peripheral surface of the base 61a of the output shaft 61. The fourth bearing 65a is supported by a cylindrical portion 15c of the first housing member 12, which will be described later. Thereby, the fourth bearing 65a supports the base 61a of the output shaft 61 so as to be rotatable about the output axis J3.

The fifth bearing 65b is formed in a cylindrical shape that opens upward and downward about the output axis J3. As described above, the inner peripheral surface of the fifth bearing 65b is in contact with the outer peripheral surface of the output shaft portion 61d of the output shaft 61. The fifth bearing 65b is held by a protruding cylindrical portion 17c of the second housing member 17, which will be described later. Thereby, the fifth bearing 65b supports the output shaft portion 61d of the output shaft 61 so as to be rotatable about the output axis J3. Further, the upper surface of the fifth bearing 65b contacts the outer edge portion of the lower surface of the large diameter portion 61c of the output shaft 61. Thereby, the position of the output shaft 61 in the axial direction is determined.

The second sensor magnet 63 is fixed on the inner peripheral surface of the magnet holder 64. The second sensor magnet 63 is fixed to the output shaft 61 by a magnet holder 64. The second sensor magnet 63 is cylindrical centered on the output axis J3. The surface of the second sensor magnet 63 facing upward faces the control device 7 with a gap therebetween in the axial direction. N and S poles are alternately arranged on the second sensor magnet 63 in the circumferential direction.

When the motor shaft 42 rotates around the central axis J1, the eccentric member 50a revolves around the central axis J1 in the circumferential direction. The revolution of the eccentric member 50a is transmitted to the external gear 51, and the external gear 51 swings while changing the position where the inner peripheral surface of the hole 51a is inscribed with the outer peripheral surface of the protruding portion 54. Thereby, the meshing position of the external gear portion 51b of the external gear 51 and the internal gear portion 52b of the internal gear 52 changes in the circumferential direction. Accordingly, the rotational force of the motor shaft 42 is transmitted to the internal gear 52 via the external gear 51.

As described above, the internal gear 52 is fixed to the second bearing holding member 48 described later, and does not rotate. Therefore, the external gear 51 rotates about the eccentric axis J2 by the reaction force of the rotational force transmitted to the internal gear 52. At this time, the rotation direction of the external gear 51 is opposite to the rotation direction of the motor shaft 42. Rotation of the external gear 51 about the eccentric axis J2 is transmitted to the output gear 53 via the hole portion 51a and the protruding portion 54. Thereby, the output gear 53 rotates around the center axis J1. The rotation of the motor shaft 42 is reduced in speed and transmitted to the output gear 53.

When the output gear 53 rotates, the drive gear 62 meshed with the output gear 53 rotates about the output axis J3. Thereby, the output shaft 61 fixed to the drive gear 62 rotates about the output axis J3. In this way, the rotational torque of the motor portion 40 is transmitted to the output shaft 61 via the reduction mechanism 50. According to the reduction mechanism (transmission mechanism) 50, the rotation speed of the output shaft 61 can be made smaller than the rotation speed of the rotor 41. Therefore, the rotational torque of the output shaft 61 can be increased. Therefore, in the electric actuator 1 of the present embodiment, a large output torque can be generated while achieving downsizing. In the present embodiment, the output shaft 61 is bi-directionally rotated within a range where it does not rotate once.

The housing 11 houses the motor unit 40, the speed reduction mechanism (transmission mechanism) 50, the output unit 60, the control device 7, and the second bearing holding member 48. The housing 11 has a first housing part 12, a cover part 16 and a second housing part 17. In the present embodiment, the first housing member 12 houses the rotor 41 and the stator 43 therein, and rotatably supports the motor shaft 42 and the output shaft 61 from above. The cover member 16 is fixed to the upper side of the first housing member 12. The second housing member 17 is fixed to the lower side of the first housing member 12, and rotatably supports the motor shaft 42 and the output shaft 61 from the lower side.

As shown in fig. 2, the first housing member 12 has a cylindrical shape extending in the axial direction. The first housing member 12 has an opening 14a that opens on the upper side and an opening 13b that opens on the lower side. As shown in fig. 1, the first housing member 12 is quadrangular in shape as viewed from the axial direction. As shown in fig. 2, the first housing member 12 has a motor housing portion 13, a circuit board housing portion 14, an output portion housing portion 15, and a partition wall 19.

As shown in fig. 2, the motor housing 13 houses the rotor 41 and the stator 43 inside. The motor housing portion 13 has a substantially cylindrical shape extending in the axial direction about the central axis J1. The motor housing portion 13 has an opening 13b that opens downward. The interior of the motor housing portion 13 communicates with the interior of the second housing member 17 via the opening 13b. The upper side of the motor housing portion 13 is blocked by the partition wall 19. A stator 43 is fixed to the inner peripheral surface of the motor housing portion 13. More specifically, the outer peripheral surface of the stator core 43a is fitted and fixed to the inner peripheral surface of the motor housing portion 13. The motor housing portion 13 has a first stepped surface 13a and a claw portion 13c.

The first step surface 13a is a downward-facing step surface provided on the inner peripheral surface of the motor housing portion 13. The first step surface 13a contacts the outer edge portion of the surface of the stator core 43a facing upward. Thereby, the axial position of the stator 43 with respect to the first housing member 12 can be determined, and the stator 43 can be restrained from moving upward.

The claw portion 13c is provided on the lower side of the motor housing portion 13. Although not shown, in the present embodiment, three claw portions 13c are provided. The claw portions 13c are arranged at equal intervals in the circumferential direction around the circumference. The upper surface of each claw portion 13c contacts the outer edge portion of the lower surface of the stator core 43 a. Thereby, the axial position of the stator 43 with respect to the first housing member 12 can be determined, and the stator 43 can be restrained from moving downward. Further, the claw portion 13c has elasticity in the radial direction. Therefore, when the stator 43 is inserted into the first housing member 12 from the lower side during assembly of the electric actuator 1, the outer peripheral surface of the stator core 43a contacts each claw portion 13c, and a portion of the motor housing portion 13 including each claw portion 13c is deformed radially outward. When the stator 43 is inserted into the upper side, the lower end of the stator core 43a is positioned above the claw portion 13c, and a part of the motor housing portion 13 including each claw portion 13c moves radially inward due to the elastic force. Thus, the upper surface of each claw portion 13c contacts the lower surface of the stator core 43a, and the axial position of the stator core 43a is determined. Therefore, in the present embodiment, the stator 43 can be easily assembled to the first housing member 12. Therefore, the man-hour for assembling the electric actuator 1 can be reduced. Further, the claw portions 13c can function as a release preventing member as long as they vertically face the surface of the stator core 43a facing downward on the surface facing upward, and therefore, contact is not necessary.

As shown in fig. 2, the circuit board housing 14 houses the control device 7 therein. As shown in fig. 1, the circuit board housing portion 14 is formed in a square tubular shape extending in the axial direction so as to surround the central axis J1 and the output axis J3. As shown in fig. 2, the circuit board housing 14 is disposed on the upper side, i.e., on one side in the axial direction, of the motor housing 13 and the output housing 15. The circuit board housing portion 14 is an upper portion of the first housing member 12. The lower end of the circuit board housing portion 14 is connected to the upper end of the motor housing portion 13 and the upper end of the output portion housing portion 15. The circuit board housing portion 14 has an opening 14a opened at an upper side. In the axial direction, the inside of the circuit board housing portion 14 and the inside of the motor housing portion 13 are partitioned by a partition wall 19. In addition, the inside of the circuit board housing portion 14 is connected to the inside of the output portion housing portion 15 in the axial direction. As shown in fig. 4, the circuit board housing portion 14 is provided with a plurality of hole portions 14b penetrating the circuit board housing portion 14 in the axial direction. In the present embodiment, 10 holes 14b are provided.

As shown in fig. 2, the output unit housing 15 internally houses a portion of the upper side of the output unit 60. As shown in fig. 4, the output unit housing portion 15 has a substantially square tubular shape that surrounds the output axis J3 and is opened upward. The output section housing section 15 is arranged radially outward of the motor housing section 13. The output portion housing portion 15 has a side wall portion 15a, a bottom wall portion 15b, a cylindrical portion 15c, and a second substrate supporting portion 15f.

The side wall 15a surrounds the output radial outside of the output shaft 61, and has a substantially square tubular shape extending in the axial direction. The radially inner portion of the side wall portion 15a is connected to the motor housing portion 13. A connection terminal holding portion 15i is provided on the outer peripheral surface of the side wall portion 15 a.

The connection terminal holding portion 15i has a substantially square tubular shape protruding outward in the output radial direction from the side wall portion 15 a. The connection terminal holding portion 15i holds a plurality of power supply connection terminals 92 and a plurality of signal connection terminals 93. As shown in fig. 3, a plurality of power supply connection terminals 92 and a plurality of signal connection terminals 93 are connected to a circuit board 70 described later. An external connector (not shown) is inserted into the connection terminal holding portion 15i. The plurality of power connection terminals 92 are connected to external power terminals held by an external connector. The circuit board 70 is electrically connected to an external power supply, not shown, via the power supply connection terminal 92 and the external power supply terminal. The plurality of signal connection terminals 93 are connected to external signal terminals held by an external connector. The circuit board 70 is electrically connected to an external device, not shown, via the signal connection terminal 93 and the external signal terminal.

As shown in fig. 2, the bottom wall portion 15b is plate-shaped surrounding the base portion 61a of the output shaft 61. The plate surface of the bottom wall portion 15b faces in the axial direction. As shown in fig. 4, a part of the end portion in the output radial direction of the bottom wall portion 15b is connected to the lower end of the side wall portion 15 a. Although not shown, the other part of the output radial end of the bottom wall 15b is connected to the lower end of the motor housing 13.

As shown in fig. 2, the cylindrical portion 15c is cylindrical with the output axis J3 as the center, and protrudes upward from the inner edge portion of the bottom wall portion 15 b. The cylindrical portion 15c is opened at the upper and lower sides. The base portion 61a of the output shaft 61 passes through the cylindrical portion 15c. A fourth bearing 65a is fixed to the inner peripheral surface of the cylindrical portion 15c. Thereby, the cylindrical portion 15c supports the output shaft 61 via the fourth bearing 65a.

As shown in fig. 4, the second substrate support portion 15f is cylindrical and protrudes upward from the bottom wall portion 15 b. As shown in fig. 2, the upper end of the second substrate support portion 15f is located below the upper end of the first housing member 12. As shown in fig. 4, in the present embodiment, two second substrate support portions 15f are provided. The second substrate support portions 15f are provided at intervals on the radially outer edge of the bottom wall portion 15 b. The second substrate support portion 15f has a second base portion 15g and a second protruding portion 15h.

The second base 15g has a cylindrical shape protruding upward from the bottom wall 15 b. The second protruding portion 15h has a cylindrical shape protruding upward from the second base portion 15 g. The second protruding portion 15h has an outer diameter smaller than that of the second base portion 15 g.

As shown in fig. 2, the partition wall 19 is disposed on the upper side of the stator 43 and the rotor core 41 a. The partition wall 19 blocks the upper side of the motor housing portion 13. The partition wall 19 is substantially annular plate-shaped with the central axis J1 as the center. As shown in fig. 4, the partition wall 19 includes a partition wall main body portion 19a, a through hole 19b, a projection portion 19f, a cylindrical portion 19i, and a first substrate support portion 19j.

As shown in fig. 2, the partition wall main body 19a is substantially annular plate-shaped with the central axis J1 as the center. The plate surface of the partition wall body 19a faces in the axial direction. The radially outer end of the partition wall main body 19a is connected to the upper end of the motor housing 13. The partition wall main body portion 19a blocks the upper side of the motor housing portion 13. Thereby, the motor housing portion 13 is spaced apart from the circuit board housing portion 14 in the axial direction.

As shown in fig. 2, the through hole 19b is a hole penetrating the partition wall main body 19a in the axial direction. The coil lead wire 43e passes through the through hole 19b in the substantially axial direction. As shown in fig. 4, in the present embodiment, three through holes 19b are provided. Each of the through holes 19b is a hole extending in the radial direction. The through holes 19b are provided at intervals in the circumferential direction. One through hole 19b is provided at a position opposite to the output axis J3 with the central axis J1 interposed therebetween. The other two through holes 19b are provided on one circumferential side and the other circumferential side of one through hole 19b, respectively. The through hole 19b has an insertion hole 19c and a long hole 19d connected to each other.

The insertion hole 19c is a circular hole penetrating the partition wall body 19a in the axial direction in the through hole 19b. As shown in fig. 2, the through hole 19b overlaps with a position where the coil lead wire 43e is led out from the coil body 43d when viewed from the axial direction. A tapered guide surface 19c1 having a diameter that decreases toward the upper side, i.e., the axial direction side, is provided at a lower portion of the inner surface of the insertion hole 19c. Therefore, the inner diameter of the upper end of the insertion hole 19c is smaller than the inner diameter of the lower end of the insertion hole 19c. In the present embodiment, a part of the coil lead wire 43e passes through the insertion hole 19c in the substantially axial direction. More specifically, a part of the coil lead wire 43e passes obliquely from the axial direction to the radial direction.

As shown in fig. 4, the long hole 19d extends from the insertion hole 19c to the radially inner side (radial side) and penetrates the partition wall body 19a in the axial direction. The long hole 19d may extend radially outward from the insertion hole 19 c. As shown in fig. 2, the radially inner end of the long hole 19d is located radially inward of the stator 43. As shown in fig. 4, in the present embodiment, the width of the long hole 19d in the direction orthogonal to the radial direction is set smaller than the width of the insertion hole 19c in the direction orthogonal to the radial direction. The width of the long hole 19d in the direction perpendicular to the radial direction may be the same width as or larger than the width of the insertion hole 19c in the direction perpendicular to the radial direction. As shown in fig. 2, a part of the coil outgoing line 43e passes through the long hole 19d in the substantially axial direction. More specifically, a part of the coil lead wire 43e passes obliquely from the axial direction to the radial direction. That is, in the present embodiment, the coil lead-out wire 43e passes through both the insertion hole 19c and the long hole 19d in the axial direction. That is, the coil lead-out wire 43e passes through at least one of the insertion hole 19c and the long hole 19d in the axial direction.

As described above, according to the present embodiment, the long hole 19d extends from the insertion hole 19c to the radially inner side. Therefore, the partition wall 19 and the circuit board 70 described later can be prevented from being enlarged in the radial direction as compared with the case where the long hole 19d extends radially outward from the insertion hole 19 c. Therefore, the electric actuator 1 can be suppressed from being enlarged in the radial direction.

As shown in fig. 2, the protruding portion 19f protrudes upward from the partition wall main body portion 19 a. The protrusion 19f is disposed between the partition wall body 19a and a circuit board 70 described later in the axial direction. As shown in fig. 4, in the present embodiment, three protrusions 19f are provided. The protrusions 19f are provided at the edge portions of the through holes 19b different from each other. More specifically, each of the protrusions 19f is provided on the other circumferential edge of the elongated hole 19d of each of the through holes 19 b. The protruding portion 19f has a connecting portion 19g and a hooking portion 19h.

The connection portion 19g is a rectangular plate-like shape protruding upward, i.e., axially toward one side, from the partition wall main body portion 19 a. The plate surface of the connecting portion 19g faces the circumferential direction. The connecting portion 19g is disposed at the other circumferential edge of the elongated hole 19 d. The radially inner end of the connecting portion 19g is disposed radially outward of the radially inner end of the elongated hole 19 d.

As shown in fig. 4, the hooking portion 19h is a rectangular plate-like portion protruding from an upper end portion of the connecting portion 19g, i.e., one end portion in the axial direction, in a direction orthogonal to the radial direction. The hooking portion 19h is disposed so as to overlap the long hole 19d when viewed in the axial direction. That is, the protrusion 19f has a hooking portion 19h arranged to overlap the through hole 19b when viewed in the axial direction. The radially inner end of the hooking portion 19h is disposed radially outward of the radially inner end of the long hole 19 d. As shown in fig. 5, a groove 19h1 recessed toward the upper side, i.e., the axial direction side and extending in the radial direction is provided in the surface of the hooking portion 19h facing the lower side, i.e., the axial direction side. In the present embodiment, the groove 19h1 has a tapered shape in which the width in the direction orthogonal to the radial direction becomes narrower as it goes upward. The coil lead wire 43e is held in the slot 19h1.

As shown in fig. 2, the coil lead wire 43e passing through the through hole 19b in the axial direction passes between the through hole 19b and the hooking portion 19h toward the radially inner side (the radially one side) in the axial direction. More specifically, as shown in fig. 5, the coil lead wire 43e passes radially inward along the groove 19h1 of the hooking portion 19 h. As shown in fig. 2, the coil lead wire 43e is bent upward at the end portion of the hooking portion 19h on the inner side in the radial direction (on the radial direction side).

As described above, according to the present embodiment, the protruding portion 19f has the connecting portion 19g protruding from the partition wall main body portion 19a to the upper side, i.e., the axial direction side, and the hooking portion 19h protrudes from the upper end portion of the connecting portion 19g in the direction orthogonal to the radial direction. Therefore, the protruding portion 19f can be constituted in a simple shape only by the connecting portion 19g and the hooking portion 19 h. Therefore, the protruding portion 19f can be provided when the first housing member 12 is formed. Therefore, the projection 19f does not need to be constituted by another member other than the first housing member 12. Therefore, an increase in the number of components of the first housing member 12 and the number of manufacturing steps can be suppressed. Therefore, an increase in the number of components and assembly man-hours of the electric actuator 1 can be suppressed.

As shown in fig. 2, the cylindrical portion 19i is a cylindrical shape that protrudes downward from the partition wall main body portion 19a and opens downward. The cylindrical portion 19i surrounds the upper end of the motor shaft 42 and the first bearing 44a from the radially outer side.

The first bearing holding member 47 is formed in a cylindrical shape that opens upward and downward about the central axis J1. The first bearing holding member 47 surrounds the upper side portion of the motor shaft 42 and the first bearing 44a from the radially outer side. The outer peripheral surface of the first bearing holding member 47 is fixed to the inner peripheral surface of the cylindrical portion 19 i. The first bearing 44a is held on the inner peripheral surface of the first bearing holding member 47. Thereby, the first bearing 44a is held by the housing 11 via the first bearing holding member 47. Thereby, the first bearing 44a supports the upper end of the motor shaft 42 rotatably about the central axis J1.

As shown in fig. 4, the first substrate support portion 19j has a cylindrical shape protruding upward from the partition wall main body portion 19 a. As shown in fig. 2, the upper end of the second substrate support portion 15f is located above the circuit substrate 70 described later. As shown in fig. 4, in the present embodiment, five first substrate support portions 19j are provided. Each of the first substrate support portions 19j has a first base portion 19k and a first protruding portion 19m.

The first base 19k is cylindrical and protrudes upward from the partition wall main body 19 a. The first protruding portion 19m is cylindrical and protrudes upward from the first base portion 19 k. The first protruding portion 19m has an outer diameter smaller than that of the first base portion 19 k. In the axial direction, the surface of the first base portion 19k facing upward is disposed at the same position as the surface of the second base portion 15g facing upward.

As shown in fig. 1, the cover member 16 is fixed to the upper side of the first housing member 12. The cover member 16 has a substantially rectangular tubular shape that protrudes in the axial direction and opens downward. As shown in fig. 2, the cover member 16 blocks the opening 14a of the first housing member 12 from the upper side. A part of a control device 7 described later is housed in the cover member 16. In the present embodiment, the cover member 16 is made of metal. The cover member 16 is formed by, for example, die casting. The cover member 16 has a cover main body portion 16a, a cover side portion 16b, and a claw portion 16d.

As shown in fig. 1, the cover main body portion 16a has a substantially quadrangular plate shape. As shown in fig. 2, the plate surface of the cover main body portion 16a faces in the axial direction. An outer edge portion of the downward surface of the lid main body portion 16a contacts an upper end of the circuit board housing portion 14. Thereby, the lid member 16 closes the opening 14a of the first case member 12 from the upper side.

The lid side portion 16b is substantially rectangular and cylindrical and protrudes downward from the lid main body portion 16 a. The lid side portion 16b is provided along the outer edge portion of the lid main body portion 16a throughout the entire circumference. The outer surface of the lid side portion 16b is fitted to the inner surface of the circuit board housing portion 14. Thereby, the cover member 16 is fixed to the first housing member 12.

As shown in fig. 1, the claw portion 16d is plate-like protruding downward from the outer edge portion of the lid main body portion 16 a. Although not shown, a convex portion protruding inward in the radial direction is provided at the lower end of the claw portion 16d. In the present embodiment, 10 claw portions 16d are provided. Each claw portion 16d passes through the hole portion 14b of the circuit board housing portion 14 in the axial direction. Although not shown, the convex portions of the respective claw portions 16d are fitted into concave portions provided on the outer side surface of the circuit board housing portion 14. Thereby, the cover member 16 is fixed to the first housing member 12.

As shown in fig. 2, the second housing part 17 is fixed to the underside of the first housing part 12. The second housing member 17 houses the reduction mechanism 50 and a lower portion of the output unit 60 therein. The second housing part 17 blocks the opening 13b of the first housing part 12 from the underside. In the present embodiment, the second housing member 17 is made of metal. The second housing part 17 is shaped, for example, by die casting. The second housing member 17 has a side portion 17a, a bottom portion 17b, a bottom plate portion 17c1, a protruding cylindrical portion 17c, and a mounting portion 17g.

As shown in fig. 2, the side portion 17a is cylindrical and opened upward so as to surround the central axis J1 and the output axis J3. The side portion 17a surrounds the reduction mechanism 50 and a portion of the lower side of the output portion 60 from the radially outer side. A concave portion 17i recessed downward is provided on an upper surface of the side portion 17 a. The lower end of the motor housing 13 and the lower end of the output housing 15 fit into the recess 17i. Thereby, the radial and circumferential positions of the second housing part 17 relative to the first housing part 12 are determined.

The bottom 17b is substantially cylindrical and open upward about the central axis J1. The bottom 17b is disposed below the speed reducing mechanism 50. The radially outer end of the bottom 17b is connected to the lower end of the side 17 a. The bottom 17b holds the second bearing holding member 48. The bottom 17b has a first cylindrical portion 17b1, a first bottom 17b2, a second cylindrical portion 17b3, and a second bottom 17b4.

The first cylindrical portion 17b1 is cylindrical and opens upward about the central axis J1. The upper end of the first tube portion 17b1 is connected to the lower end of the side portion 17 a. The first cylindrical portion 17b1 surrounds the external gear 51 and the internal gear 52.

The first bottom 17b2 is annular plate-shaped centered on the central axis J1. The plate surface of the first bottom 17b2 faces the axial direction. The first bottom 17b2 is disposed below the external gear 51 and the internal gear 52. The radially outer end of the first bottom portion 17b2 is connected to the lower end of the first tube portion 17b 1.

The second cylindrical portion 17b3 is cylindrical and opens upward about the central axis J1. The second cylindrical portion 17b3 surrounds the second bearing 44b and the fourth portion 42e of the motor shaft 42. The upper end of the second cylindrical portion 17b3 is connected to the radially inner end of the first bottom portion 17b 2.

The second bottom 17b4 is disk-shaped with the central axis J1 as the center. The plate surface of the second bottom portion 17b4 faces in the axial direction. The second bottom 17b4 is disposed on the lower side of the second bearing 44b. The radially outer end of the second bottom portion 17b4 is connected to the lower end of the second cylindrical portion 17b 3.

As shown in fig. 2, the second bearing holding member 48 is held to the bottom 17b, and holds the second bearing 44b. The second bearing holding member 48 is disposed between the bottom portion 17b and the reduction mechanism 50. The second bearing holding member 48 has a first cylindrical portion 48a, a flat portion 48b, a second cylindrical portion 48c, and an annular portion 48d.

The first cylindrical portion 48a is cylindrical and opens upward about the central axis J1. The first cylindrical portion 48a surrounds the external gear 51 and the internal gear 52. The first cylindrical portion 48a is fitted to the first cylindrical portion 17b 1. An internal gear 52 is fixed to the inner peripheral surface of the second bearing holding member 48.

The planar portion 48b is annular plate-shaped centered on the central axis J1. The plate surface of the flat portion 48b faces in the axial direction. The radially outer end of the planar portion 48b is connected to the lower end of the first cylindrical portion 48 a. The downward-facing surface of the flat surface portion 48b contacts the upward-facing surface of the first bottom portion 17b 2. The radially outer portion of the upper-facing surface of the flat surface portion 48b supports the lower-facing surface of the internal gear 52.

The second cylindrical portion 48c is cylindrical and opens upward about the central axis J1. The upper end of the second cylindrical portion 48c is connected to the radially inner end of the planar portion 48 b. The second cylindrical portion 48c is fitted to the second cylindrical portion 17b 3. A second bearing 44b is fixed to the inner peripheral surface of the second cylindrical portion 48 c. More specifically, the outer ring of the second bearing 44b is fitted and fixed to the inner peripheral surface of the second cylindrical portion 48 c. Thereby, the second bearing 44b is fixed to the second housing member 17 via the second bearing holding member 48.

The annular portion 48d is annular plate-shaped centered on the central axis J1. The plate surface of the annular portion 48d faces in the axial direction. The radially outer end of the annular portion 48d is connected to the lower end of the second cylindrical portion 48 c. The surface of the annular portion 48d facing upward supports the outer ring of the second bearing 44b in the axial direction. Thereby, the axial position of the second bearing 44b is determined.

The bottom plate portion 17c1 is annular plate-shaped centered on the output axis J3. The plate surface of the bottom plate portion 17c1 faces in the axial direction. The bottom plate portion 17c1 is disposed below the drive gear 62. The radially inner end of the bottom plate portion 17c1 is connected to the upper end of the first tube portion 17b 1. The radially outer end of the bottom plate portion 17c1 is connected to the lower end of the side portion 17 a.

The protruding cylindrical portion 17c is cylindrical and opens upward and downward about the output axis J3. The protruding cylindrical portion 17c protrudes downward from the output radial direction inner end of the bottom plate portion 17c 1. The protruding cylindrical portion 17c surrounds the output shaft portion 61d of the output shaft 61. The fifth bearing 65b is held on the inner peripheral surface of the protruding cylindrical portion 17 c. Thereby, the output shaft 61 is held by the second housing member 17 via the fifth bearing 65b.

As shown in fig. 1 and 2, the mounting portion 17g has a substantially cylindrical shape protruding radially outward from the side portion 17 a. The mounting portion 17g is opened at the upper and lower sides. Although not shown, in the present embodiment, three mounting portions 17g are provided. A cylindrical collar member 95 that opens at the upper and lower sides is fixed to the inner peripheral surface of each mounting portion 17 g. A screw screwed into an internal threaded portion of a vehicle portion, not shown, passes through the inside of the collar member 95 in the axial direction. Thereby, the electric actuator 1 is mounted to the vehicle via the collar member 95.

The control device 7 controls the current supplied to the plurality of coils 43 c. As shown in fig. 2, the control device 7 is disposed above the motor unit 40 and the output unit 60. The control device 7 is housed in the circuit board housing portion 14. As shown in fig. 2 and 3, the control device 7 includes a circuit board 70, a plurality of electronic components 71, a motor sensor 8, and an output sensor 9.

As shown in fig. 2, the circuit board 70 is disposed above the motor unit 40 and the output unit 60. The circuit board 70 has a plate shape with a plate surface orthogonal to the axial direction. The circuit board 70 is accommodated in the circuit board accommodating portion 14. That is, the circuit board 70 is housed in the case 11. As shown in fig. 2 or 3, a plurality of electronic components 71, a motor portion sensor 8, an output portion sensor 9, a power supply connection terminal 92, a signal connection terminal 93, and the other end of the coil lead wire 43e of the coil 43c are mounted on the circuit board 70. As shown in fig. 3, the circuit board 70 has a substantially rectangular shape when viewed from the axial direction. The circuit board 70 is provided with a hole portion 70a, a first fitting hole 70b, and a second fitting hole 70c.

As shown in fig. 2, the hole 70a is a hole penetrating the circuit board 70 in the axial direction. The coil lead wire 43e passes through the hole portion 70a in the axial direction. The other end of the coil lead wire 43e is fixed to the hole 70a by welding. Thereby, the coil 43c is electrically connected to the circuit board 70. In the present embodiment, three hole portions 70a are provided at intervals in the circumferential direction. As shown in fig. 2, the hole 70a overlaps with an end portion of the hooking portion 19h on the radially inner side (radially side) when viewed in the axial direction. In addition, the hole 70a is disposed at a position not overlapping the coil body 43d when viewed in the axial direction. In the present embodiment, the hole 70a is disposed radially inward of the coil body 43d. Therefore, according to the present embodiment, when the coil lead wire 43e is fixed to the hole 70a of the circuit board 70 by soldering, the molten high-temperature solder can be prevented from falling downward and adhering to the coil body 43d. Therefore, the coil body 43d can prevent the insulating cover layer covering the conductive coil wire from melting and the coil wire from being exposed to the outside. That is, the insulation properties of the coil body 43d can be appropriately ensured.

As shown in fig. 3, the first fitting hole 70b is a circular hole penetrating the circuit board 70 in the axial direction. In the present embodiment, five first fitting holes 70b are provided. Each of the first fitting holes 70b overlaps with the first substrate support portion 19j of the partition wall 19 as viewed in the axial direction. As shown in fig. 2, the downward-facing surface of the circuit board 70 is supported by the upward-facing surface of the first base 19 k. Thereby, the axial position of the circuit board 70 is determined. The first fitting hole 70b is fitted to the first protruding portion 19 m. Thereby, the circuit board 70 is fixed to the first case member 12. In addition, the tip of the first protruding portion 19m is preferably deformed to a diameter larger than the first fitting hole 70b by heat staking in a state of being inserted into the first fitting hole 70b. In this case, the deformed distal end portion of the first protruding portion 19m functions as a release preventing member for the circuit board 70.

As shown in fig. 3, the second fitting hole 70c is a circular hole penetrating the circuit board 70 in the axial direction. In the present embodiment, two second fitting holes 70c are provided. Each of the second fitting holes 70c overlaps with the second substrate support portion 15f of the output portion housing portion 15, as viewed in the axial direction. Although not shown, the downward surface of the circuit board 70 is supported by the upward surface of the second base 15 g. Thereby, the axial position of the circuit board 70 is determined. The second fitting hole 70c is fitted to the second protruding portion 15 h. Thereby, the circuit board 70 is fixed to the first case member 12. In addition, the tip of the second protruding portion 15h is preferably heat-staked in the same manner as the first protruding portion 19 m.

A plurality of electronic components 71 are mounted on the circuit substrate 70. The plurality of electronic components 71 are fixed to the circuit board 70 by soldering or the like, and are electrically connected to the circuit board 70. The plurality of electronic components 71 are fixed to the upper surface or the lower surface of the circuit board 70. In the present embodiment, the plurality of electronic components 71 are electronic components such as capacitors and transistors.

The motor section sensor 8 is fixed to the lower surface of the circuit board 70. More specifically, the motor sensor 8 is fixed to a portion of the lower surface of the circuit board 70 that faces the first sensor magnet 45 in the axial direction with a gap therebetween. The motor section sensor 8 is a magnetic sensor capable of detecting the magnetic field of the first sensor magnet 45. The motor portion sensor 8 is a hall element such as a hall IC, for example. The motor unit sensor 8 detects the rotation position of the first sensor magnet 45 by detecting the magnetic field of the first sensor magnet 45, thereby detecting the rotation of the motor shaft 42.

The output sensor 9 is fixed to the lower surface of the circuit board 70. More specifically, the output sensor 9 is fixed to a portion of the lower surface of the circuit board 70 that faces the second sensor magnet 63 in the axial direction with a gap therebetween. The output sensor 9 is a magnetic sensor capable of detecting the magnetic field of the second sensor magnet 63. The output sensor 9 is a hall element such as a hall IC, for example. The output sensor 9 detects the rotation position of the second sensor magnet 63 by detecting the magnetic field of the second sensor magnet 63, thereby detecting the rotation of the output shaft 61.

Next, a process of connecting the lead wire 43e and the circuit board 70 in the assembly of the electric actuator 1 according to the present embodiment will be described. The steps of connecting the coil lead wire 43e and the circuit board 70 include an insertion step, a bending step, a board fixing step, and a coil lead wire connecting step. In the following description, "worker or the like" in the specification includes workers and assembling devices for performing respective works. Each operation may be performed by only the operator, by only the assembling device, or by both the operator and the assembling device.

The insertion step is a step of passing the coil lead wire 43e through the insertion hole 19c of the partition wall 19. As shown in fig. 6, the operator or the like first moves the stator 43 from the lower side with respect to the first housing member 12 fixed to the jig or the like, and inserts the stator into the motor housing portion 13 through the opening 13 b. At this time, the coil lead wire 43e is led out upward from the coil body 43d, and protrudes upward from the coil body 43 d. The coil lead-out wire 43e overlaps the insertion hole 19c when viewed in the axial direction. Although not shown, when the stator core 43a is inserted into the motor housing portion 13, the outer peripheral surface of the stator core 43a contacts the claw portion 13 c. Thereby, a part of the first housing member 12 including the claw portion 13c is bent radially outward.

As shown in fig. 7, when an operator or the like inserts the stator 43 into the motor housing portion 13, the coil lead wire 43e axially passes through the insertion hole 19c (shown by a two-dot chain line). In the present embodiment, as described above, the coil lead wire 43e is led upward from the coil body 43d, and the coil lead wire 43e overlaps the insertion hole 19c when viewed from the axial direction. Therefore, the coil lead wire 43e can be inserted into the insertion hole 19c only by inserting the stator 43 into the first housing member 12.

In addition, according to the present embodiment, a tapered guide surface 19c1 having a diameter decreasing toward the upper side, i.e., the axial direction side, is provided on the inner side surface of the insertion hole 19c. Therefore, even when the coil lead-out wire 43e protrudes from the coil body 43d obliquely from the axial direction, the other end of the coil lead-out wire 43e contacts the guide surface 19c1 and is guided by the guide surface 19c1 in the center direction of the insertion hole 19c. This makes it possible to easily pass the coil lead wire 43e through the insertion hole 19c. Therefore, workability of the insertion process can be improved. Therefore, the man-hour for assembling the electric actuator 1 can be reduced. In addition, since the inner diameter of the upper side of the insertion hole 19c can be reduced, the positions in the radial and circumferential directions of the coil lead-out wires 43e passing through the insertion hole 19c can be determined with higher accuracy.

The operator or the like inserts the stator 43 into the motor housing portion 13 until the outer edge portion of the upper surface of the stator core 43a contacts the first step surface 13a, and the insertion process ends. At this time, the lower end of the stator core 43a is located above the claw portion 13 c. Therefore, the claw portion 13c moves radially inward by the elastic force, and the surface of the claw portion 13c facing upward contacts the outer edge portion of the surface of the stator core 43a facing downward. Thereby, the position of the stator core 43a in the axial direction with respect to the first housing member 12 is determined, and the stator 43 is fixed to the first housing member 12. That is, in the present embodiment, the stator 43 can be fixed to the first housing member 12 by simply inserting the stator 43 into the first housing member 12, and determining the position of the stator 43 in the axial direction. Therefore, the man-hour for assembling the electric actuator 1 can be reduced.

The bending step is a step of hooking the coil lead wire 43e to the hooking portion 19h of the protrusion 19f and bending it upward. As shown in fig. 7, a coil lead-out wire 43e (shown by a two-dot chain line) passing through the insertion hole 19c in the axial direction is pulled radially inward by an operator or the like, and passes between the hooking portion 19h and the long hole 19 d. At this time, as shown in fig. 5, the coil lead wire 43e is held inside the groove 19h1 of the hooking portion 19 h. Therefore, the position of the coil lead wire 43e in the direction orthogonal to the radial direction can be easily specified by the groove 19h 1. In addition, as described above, since the coil lead-out wire 43e is pulled toward the radial direction inside, the coil lead-out wire 43e passes through both the insertion hole 19c and the long hole 19d in the axial direction. That is, the coil lead-out wire 43e passes through at least one of the insertion hole 19c and the long hole 19d in the axial direction.

Next, the worker or the like hooks the coil lead-out wire 43e passing between the hooking portion 19h and the long hole 19d to the hooking portion 19h, and bends upward at the end portion of the hooking portion 19h on the radially inner side (radially one side) so as to follow the surface of the hooking portion 19h facing the radially inner side. At this time, since the coil lead wire 43e protrudes upward along the radially inward facing surface of the hooking portion 19h, the position of the coil lead wire 43e in the axial direction can be easily determined.

The substrate fixing step is a step of fixing the circuit substrate 70 to the first case member 12 and passing the coil lead wires 43e through the holes 70a of the circuit substrate 70. As shown in fig. 8, the operator or the like moves the circuit board 70 from the upper side with respect to the first housing member 12 fixed to the jig or the like, and inserts the circuit board into the circuit board accommodating portion 14 through the opening 14 a. At this time, the first fitting hole 70b of the circuit board 70 overlaps the first protruding portion 19m, and the second fitting hole 70c overlaps the second protruding portion 15h, as viewed from the axial direction. In addition, the hole 70a overlaps with a portion of the coil lead wire 43e protruding upward when viewed in the axial direction. That is, the coil lead wire 43e is bent toward the hole 70 a. Therefore, when the circuit board 70 is inserted into the circuit board housing portion 14, the first protruding portion 19m is inserted into the first fitting hole 70b, the second protruding portion 15h is inserted into the second fitting hole 70c, and the coil lead-out wire 43e is axially passed through the hole portion 70 a.

As shown in fig. 9, when the operator inserts the circuit board 70 into the circuit board housing portion 14 until the downward-facing surface of the circuit board 70 contacts the upward-facing surface of the first base portion 19k, the board fixing process is completed. At this time, although not shown, the downward surface of the circuit board 70 is also in contact with the upward surface of the second base 15 g. In addition, as described above, the first fitting hole 70b is fitted with the first protruding portion 19 m. The second fitting hole 70c is fitted to the second protruding portion 15 h. Thereby, the circuit board 70 is fixed to the first case member 12. In addition, as described above, the front ends of the first protruding portion 19m and the second protruding portion 15h may also be heat staked. In the present embodiment, the coil lead wire 43e can be inserted through the hole 70a only by inserting the circuit board 70 into the first case member 12.

The coil lead wire connection step is a step of connecting the coil lead wire 43e to the circuit board 70 by soldering. As described above, the coil lead wire 43e passing through the hole 70a in the axial direction and the circuit board 70 are connected by soldering. Thereby, the stator 43 is electrically connected to the circuit board 70.

According to the present embodiment, the partition wall 19 has: a partition wall main body portion 19a that separates the motor housing portion 13 and the circuit board housing portion 14 in the axial direction; a through hole 19b extending in the radial direction and passing through the partition wall main body 19a in the axial direction; and a protrusion 19f disposed between the partition wall body 19a and the circuit board 70 in the axial direction, the coil 43c having: a coil body 43d wound around the stator 43; and a coil lead-out wire 43e which is led out from the coil body 43d to the upper side, i.e., the axial direction side, and is connected to the circuit board 70, the protrusion 19f has a hooking portion 19h which is overlapped with the through hole 19b when viewed in the axial direction, the circuit board 70 has a hole portion 70a, the hole portion 70a penetrates the circuit board 70 and passes the coil lead-out wire 43e in the axial direction, the coil lead-out wire 43e passes through the through hole 19b in the axial direction and passes between the through hole 19b and the hooking portion 19h toward the radial direction side in the axial direction, and an end portion on the radial direction side of the hooking portion 19h is bent toward the hole portion 70a. As a result, the hooking portion 19h is disposed so as to overlap the through hole 19b when viewed in the axial direction, and therefore the coil lead-out wire 43e passing through the through hole 19b in the axial direction can be easily hooked to the hooking portion 19h. Therefore, the coil lead wire 43e can be easily bent toward the hole 70a, which is the upper side, by hooking the hooking portion 19h. Therefore, the assembling man-hour in the bending process can be reduced. In the bending step, the coil lead wire 43e is hooked to the hooking portion 19h and bent upward, so that the position of the coil lead wire 43e in the radial direction can be easily and accurately determined. Therefore, in the substrate fixing step, the coil lead wire 43e can be inserted through the hole 70a only by inserting the circuit board 70 into the first case member 12. Therefore, the coil lead wire 43e can be easily inserted into the hole 70a of the circuit board by a simple operation without using an intermediate member such as a bus bar unit. Therefore, the number of components of the electric actuator 1 can be reduced, and the man-hours for assembling the substrate fixing process can be reduced. Therefore, the number of components and the assembly man-hour of the electric actuator 1 can be reduced.

In the present embodiment, the coil lead wire 43e passes through the through hole 19b extending in the radial direction. Therefore, even if the hooking portion 19h is disposed on the radial side of the coil body portion 43d, the coil lead-out wire 43e between the coil body portion 43d and the hooking portion 19h can be made to pass through the through hole 19b on the radial side while facing upward. Therefore, the coil lead wire 43e can be led out from the coil body 43d to the inside of the circuit board housing portion 14 toward the upper side and the radial side. Therefore, the curvature of the coil lead wire 43e between the coil body portion 43d and the hooking portion 19h can be reduced, and the bending stress applied to the coil lead wire 43e at that portion can be reduced. Therefore, in the bending step, the coil lead wire 43e can be easily caught by the catching portion 19h and bent upward. Therefore, the man-hour for assembling the electric actuator 1 can be reduced. In addition, since the bending stress applied to the coil lead wire 43e can be reduced, damage to the coil lead wire 43e can be suppressed.

According to the present embodiment, the through hole 19b includes: an insertion hole 19c penetrating the partition wall main body 19a in the axial direction; and a long hole 19d extending from the insertion hole 19c to the radial direction side, the width of the insertion hole 19c in the direction orthogonal to the radial direction being smaller than the width of the insertion hole 19c in the direction orthogonal to the radial direction, the hooking portion 19h being disposed so as to overlap the long hole 19d when viewed in the axial direction, and the coil lead-out wire 43e passing through at least either the insertion hole 19c or the long hole 19d in the axial direction. Therefore, in the insertion step, the coil lead wire 43e can be passed through the inside of the circuit board housing portion 14 via the insertion hole 19c having a large diameter. Therefore, in the insertion step, the coil lead wire 43e can be inserted into the insertion hole 19c only by inserting the stator 43 into the motor housing portion 13. Therefore, the assembly man-hour in the insertion process can be reduced. In the bending step, the coil lead-out wire 43e is led out from the coil body 43d upward and radially outward, so that the coil lead-out wire 43e can be inserted into the long hole 19d having a small width in the direction perpendicular to the radial direction. Thus, the position of the coil lead wire 43e in the direction orthogonal to the radial direction can be specified with higher accuracy inside the circuit board housing portion 14. Further, since the hooking portion 19h is disposed so as to overlap the long hole 19d when viewed from the axial direction, the coil lead wire 43e can be easily hooked to the hooking portion 19h and bent toward the hole 70a, which is the upper side. Therefore, the assembling man-hour of the bending process can be reduced. Therefore, the man-hour for assembling the electric actuator 1 can be reduced.

In the present embodiment, as described above, since the coil lead-out wire 43e is caught by the catching portion 19h of the protruding portion 19f and is bent upward, the coil lead-out wire 43e can be made to protrude upward along the catching portion 19h toward the radially inner side. Therefore, the position of the coil lead wire 43e in the radial direction can be determined with higher accuracy. Therefore, in the substrate fixing step, the coil lead-out wire 43e can be easily inserted through the hole 70a only by inserting the circuit substrate 70 into the first case member 12. Therefore, the coil lead wire 43e can be easily inserted into the hole 70a of the circuit board by a simple operation without using an intermediate member such as a bus bar unit. Therefore, the number of components and the assembly man-hour of the electric actuator 1 can be reduced.

According to the present embodiment, the end portion on one side in the radial direction (radially inner side) of the hooking portion 19h overlaps the hole portion 70a when viewed in the axial direction. Therefore, in the bending step, the coil lead wire 43e that is hooked to the hooking portion 19h and bent upward can be made to protrude toward the hole 70a. Therefore, in the substrate fixing step, the coil lead-out wire 43e can be easily inserted through the hole 70a only by inserting the circuit substrate 70 into the first case member 12. Therefore, the man-hour for assembling the substrate fixing step can be reduced. Therefore, the man-hour for assembling the electric actuator 1 can be reduced.

According to the present embodiment, a groove 19h1 recessed toward the upper side, i.e., the axial one side and extending in the radial direction is provided on the lower side, i.e., the surface facing the other axial side of the hooking portion 19 h. Therefore, in the bending step, the coil lead wire 43e is held inside the groove 19h1 of the hooking portion 19h, and therefore the coil lead wire 43e is less likely to fall off from the hooking portion 19h in a direction orthogonal to the radial direction, and therefore the coil lead wire 43e can be easily led out to the radially inner side. Therefore, the coil lead wire 43e can be easily caught by the catching portion 19h and bent upward. Therefore, the assembling man-hour of the bending process can be reduced. Therefore, the man-hour for assembling the electric actuator 1 can be reduced.

While the embodiments of the present utility model have been described above, the structures and combinations thereof in the embodiments are examples, and the structures may be added, omitted, substituted, and other modified without departing from the spirit of the present utility model. The present utility model is not limited to the embodiments.

The electric actuator to which the present utility model is applied may be any device that can move an object by being supplied with electric power, and may be a motor that does not have a reduction mechanism. The electric actuator may be an electric pump having a pump unit driven by a motor unit. The application of the electric actuator is not particularly limited. The electric actuator may be mounted on a shift-by-wire type actuator device that is driven based on a shift operation by a driver. The electric actuator may be mounted on a device other than the vehicle.

The protruding portion may have any structure as long as it can hold the coil lead wire. The projection may be a member different from the first housing member and fixed to the first housing member. The protruding portion may not be fixed to the first housing.

The through-hole may have any structure as long as it can easily pass the coil lead wire in the axial direction. For example, the long hole may be a hole extending radially outward from the insertion hole. In addition, the long hole may not be provided. The guide surface 19c1 may not be provided.

Claims

1. An electric actuator, comprising:

a rotor rotatable about a central axis extending in an axial direction;

a stator having a coil and facing the rotor with a gap therebetween;

a circuit board electrically connected to the coil; and

a housing that houses the rotor, the stator, and the circuit board therein,

the housing has:

a motor housing unit that houses the rotor and the stator inside;

a circuit board housing section that houses the circuit board therein and is disposed on one side in an axial direction of the motor housing section; and

a partition wall disposed axially between the motor housing portion and the circuit board housing portion,

The partition wall has:

a partition wall body portion that separates the motor housing portion from the circuit board housing portion in an axial direction;

a through hole extending in a radial direction and penetrating the partition wall main body in an axial direction; and

a protrusion portion disposed between the partition wall main body portion and the circuit board in an axial direction,

the coil has a coil main body wound around the stator and a coil lead-out wire led out from the coil main body to one side in the axial direction and connected to the circuit board,

the protrusion has a hooking portion which is arranged to overlap with the through hole when viewed in the axial direction,

the circuit board is provided with a hole part which penetrates through the circuit board and is used for the coil outgoing line to axially pass through,

the coil lead-out wire passes through the through-hole in the axial direction and passes between the through-hole and the hooking portion toward the radial side in the axial direction, and an end portion on the radial side of the hooking portion is bent toward the hole portion.

2. The electric actuator of claim 1, wherein the electric actuator is configured to move the actuator,

the through hole has:

an insertion hole penetrating the partition wall body in an axial direction; and

a long hole extending from the insertion hole to one side in the radial direction, the long hole having a smaller width in a direction orthogonal to the radial direction than a width in a direction orthogonal to the radial direction of the insertion hole, the long hole penetrating the partition wall main body portion in the axial direction,

The hooking portion is disposed so as to overlap with the long hole when viewed in the axial direction,

the coil lead-out wire passes through at least either one of the insertion hole or the long hole in the axial direction.

3. The electric actuator according to claim 2, wherein,

the long hole extends radially inward from the insertion hole.

4. An electric actuator according to claim 2 or 3, characterized in that,

the inner side surface of the insertion hole is provided with a tapered guide surface having a diameter that decreases toward one side in the axial direction.

5. An electric actuator according to any one of claims 1 to 3, characterized in that,

the protrusion portion has a connecting portion protruding from the partition wall main body portion to one side in the axial direction,

the hooking portion protrudes from an end portion of the connecting portion on one side in an axial direction in a direction orthogonal to a radial direction.

6. An electric actuator according to any one of claims 1 to 3, characterized in that,

an end portion of the hooking portion on one side in a radial direction overlaps the hole portion when viewed in the axial direction.

7. An electric actuator according to any one of claims 1 to 3, characterized in that,

the hole is disposed at a position not overlapping the coil body when viewed in the axial direction.

8. An electric actuator according to any one of claims 1 to 3, characterized in that,

a groove recessed toward one axial side and extending in the radial direction is provided on the surface of the hooking portion facing the other axial side.

9. An electric actuator according to any one of claims 1 to 3, comprising:

a transmission mechanism which is housed in the casing and is connected to the rotor; and

an output shaft that transmits power of the rotor via the transmission mechanism and rotates around an output axis parallel to the central axis,

the transmission mechanism makes the rotation speed of the output shaft smaller than the rotation speed of the rotor.