CN212543531U - Electric actuator - Google Patents

Abstract

One embodiment of the electric actuator of the present invention includes a motor portion, a circuit board, a housing, and a connector assembly. The housing has a through-hole penetrating a wall portion of the housing in a first direction. The connector assembly has: a connector member inserted into the through hole and fixed to the housing; a wiring member electrically connected to the circuit board; and a sealing member mounted to the connector member. The connector member has: a body part located outside the housing; a seal holding portion inserted into the through hole; and a terminal holding portion located inside the housing. The body portion has a flange portion that is fixed to a wall portion of the housing in contact with an outer side surface of the housing. The sealing member is annular and attached to the outer peripheral surface of the seal holding portion so as to surround the seal holding portion, and seals between the inner peripheral surface of the through hole and the outer peripheral surface of the seal holding portion. The electric actuator of the present invention can ensure the sealing performance between the housing and the connector member in the electric actuator, and can suppress the reduction of the productivity.

Description

Electric actuator

Technical Field

The utility model relates to an electric actuator.

Background

An electric actuator of a connector member including other members with respect to a housing (housing) is known. For example, patent document 1 describes a drive device including a motor and an electronic control device as such an electric actuator.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2016-207963

SUMMERY OF THE UTILITY MODEL

[ problem to be solved by the utility model ]

In the electric actuator as described above, in order to suppress the liquid such as water from entering the inside of the housing, it is conceivable to seal between the housing and the connector member with a liquid gasket or the like, for example. However, the work of assembling the connector member to the housing while sealing the housing and the connector member is easy to take time and labor, and the productivity of the electric actuator is easily lowered.

In view of the above, it is an object of the present invention to provide an electric actuator having a structure that can ensure sealability between a housing and a connector member and can suppress a reduction in productivity. Another object of the present invention is to provide a method of manufacturing an electric actuator, which can ensure sealing between a housing and a connector member and can suppress a reduction in productivity.

[ means for solving problems ]

An embodiment of the electric actuator of the present invention comprises: a motor section; a circuit board electrically connected to the motor unit; a housing accommodating the motor unit and the circuit board; and a connector assembly (connector assembly) secured to the housing. The housing has a through-hole penetrating a wall portion of the housing in a first direction. The connector assembly has: a connector member inserted into the through hole and fixed to the housing; a wiring member held by the connector member and electrically connected to the circuit board; and a sealing member mounted to the connector member. The connector member has: a body portion protruding from a wall portion of the housing to one side of the first direction and located outside the housing; a seal holding portion which is a columnar shape protruding from the main body portion to the other side in the first direction and is inserted into the through hole; and a terminal holding portion that is a columnar shape protruding from the seal holding portion to the other side in the first direction and is positioned inside the housing. The body portion has a flange portion provided at an end portion of the other side of the first direction in the body portion. The flange portion is fixed to a wall portion of the housing in contact with an outer side surface of the housing. The wiring member has a terminal portion that protrudes from the terminal holding portion inside the housing and is connected to the circuit board. The sealing member is annular and attached to the outer peripheral surface of the seal holding portion so as to surround the seal holding portion, and seals between the inner peripheral surface of the through hole and the outer peripheral surface of the seal holding portion.

The electric actuator of the present invention is characterized in that the terminal portion protrudes from the terminal holding portion to one of the sides in a second direction orthogonal to the first direction, an end portion of one of the sides in the second direction in the terminal portion is located closer to one of the sides in the second direction than the seal holding portion, and a center axis of the terminal holding portion is eccentric to one of the sides in the second direction with respect to a center axis of the seal holding portion.

The electric actuator of the present invention is characterized in that the distance in the second direction between the end of the other side of the second direction in the terminal holding portion and the end of one side of the second direction in the terminal portion is smaller than the inner diameter of the through hole.

The electric actuator of the present invention is characterized in that the terminal holding portion is provided with a portion located closer to one side of the first direction than the terminal portion, and the dimension of the portion in the first direction is larger than the dimension of the through hole in the first direction.

The utility model discloses an electric actuator, wherein, the first direction be with the direction of the axial quadrature of motor portion, the second direction be with the axially parallel's of motor portion direction, the shell has: a cylindrical motor housing portion surrounding the motor portion from a radially outer side; and an outer wall portion surrounding the motor case portion from a radial outside, the through hole being provided, and the terminal holding portion being located between the motor case portion and the outer wall portion in a radial direction.

The electric actuator of the present invention is characterized in that the motor housing portion is cylindrical, and the end portion of the other side in the first direction in the terminal holding portion is provided with an inclined portion inclined along the outer peripheral surface of the motor housing portion.

The electric actuator of the present invention is characterized in that the wiring member is provided in plurality, and in at least two or more of the plurality of wiring members, the terminal portions are arranged along the outer peripheral surface of the motor housing portion.

The electric actuator of the present invention, wherein the sealing member is an O-ring.

The utility model discloses an electric actuator, wherein, still include: a speed reduction mechanism connected to the motor unit; and an output unit that transmits rotation of the motor unit via the speed reduction mechanism.

The electric actuator of the present invention is characterized in that the motor unit has a motor shaft extending in the axial direction, the output unit has an output shaft extending in the axial direction, the output shaft is coupled to the motor shaft via the speed reduction mechanism, and the motor shaft and the output shaft are arranged away from each other in the radial direction of the motor shaft.

[ effects of the utility model ]

According to an embodiment of the present invention, sealability between the housing and the connector member can be ensured in the electric actuator, and a reduction in productivity can be suppressed.

Drawings

Fig. 1 is a perspective view showing an electric actuator according to the present embodiment.

Fig. 2 is a sectional view showing the electric actuator according to the present embodiment, and is a sectional view II-II of fig. 1.

Fig. 3 is a perspective view showing a part of the housing of the present embodiment.

Fig. 4 is a sectional view showing a part of the electric actuator according to the present embodiment, and is an IV-IV sectional view of fig. 1.

Fig. 5 is a perspective view showing the connector assembly of the present embodiment.

Fig. 6 is a view of the connector assembly of the present embodiment viewed from the other side in the protruding direction.

Fig. 7 is a view of a part of the electric actuator according to the present embodiment as viewed from above.

Fig. 8 is a sectional view showing a part of the procedure of the first moving step in the connector mounting step of the present embodiment.

Fig. 9 is a sectional view showing a part of the procedure of the second moving step in the connector mounting step of the present embodiment.

Fig. 10 is a sectional view showing a part of the procedure of the third moving step in the connector mounting step of the present embodiment.

Fig. 11 is a sectional view showing a part of a procedure in the substrate mounting step of the present embodiment.

Fig. 12 is a sectional view showing a part of a procedure in the cover member mounting step of the present embodiment.

[ description of symbols ]

10: electric actuator

11: outer casing

30: outer wall part

30 a: wall part

32: motor casing

35: through hole

40: motor unit

41: motor shaft

50: speed reducing mechanism

60: output unit

61: output shaft

70: circuit board

80: connector assembly

81: connector component

81 a: body part

82: sealing member

83: wiring member

83 b: terminal section

85: flange part

86: seal holding part

87: terminal holding part

87 a: inclined part

S1: connector mounting process

Y: projecting direction (first direction)

Z: axial direction (second direction)

Detailed Description

In each figure, the Z-axis direction is a vertical direction in which the positive side is an upper side and the negative side is a lower side. The axial direction of a central axis J1, which is an imaginary axis appropriately shown in each drawing, is parallel to the Z-axis direction, i.e., the vertical direction. In the following description, the direction parallel to the axial direction of the center axis J1 will be simply referred to as "axial direction Z". Unless otherwise specified, the radial direction about the central axis J1 is simply referred to as the "radial direction", and the circumferential direction about the central axis J1 is simply referred to as the "circumferential direction".

In each drawing, the X-axis direction and the Y-axis direction are horizontal directions orthogonal to the Z-axis direction. The X-axis direction and the Y-axis direction are mutually orthogonal directions. The Y-axis direction is a direction in which the connector block 80 of the electric actuator 10 of the present embodiment protrudes. In the following description, a direction parallel to the Y-axis direction is referred to as "projecting direction Y", a positive side (+ Y side) in the Y-axis direction is referred to as "one side in the projecting direction", and a negative side (-Y side) in the Y-axis direction is referred to as "the other side in the projecting direction". The direction parallel to the X-axis direction is referred to as "width direction X".

In the present embodiment, the projecting direction Y corresponds to the first direction. One side of the protruding direction corresponds to one side of the first direction, and the other side of the protruding direction corresponds to the other side of the first direction. The axial direction Z corresponds to the second direction. The upper side corresponds to one side of the second direction, and the lower side corresponds to the other side of the second direction. In the present embodiment, the plan view means a view from above or below along the axial direction Z. The vertical direction, the horizontal direction, the upper side, and the lower side are only names for explaining the relative positional relationship of the respective parts, and the actual arrangement relationship may be an arrangement relationship other than the arrangement relationship shown by these names.

The electric actuator 10 of the present embodiment shown in fig. 1 and 2 is mounted on a vehicle. More specifically, the electric actuator 10 is mounted on a shift-by-wire (shift-by-wire) type actuator device that is driven by a shift operation performed by a vehicle driver. As shown in fig. 2, the electric actuator 10 includes a motor unit 40, a speed reduction mechanism 50, an output unit 60, a housing 11, a bus bar unit 90, a circuit board 70, a motor unit sensor 71, and an output unit sensor 72.

The motor unit 40 includes a motor shaft 41, a first bearing 44a, a second bearing 44b, a third bearing 44c, a fourth bearing 44d, a rotor body 42, a stator 43, a sensor magnet 45 for the motor unit, and a magnet holder 46. The motor shaft 41 extends in the axial direction Z.

The first bearing 44a, the second bearing 44b, the third bearing 44c, and the fourth bearing 44d rotatably support the motor shaft 41 about the center axis J1. In the present embodiment, the first bearing 44a, the second bearing 44b, the third bearing 44c, and the fourth bearing 44d are ball bearings (ball bearings), for example.

The eccentric shaft portion 41a of the motor shaft 41, which is a portion supported by the third bearing 44c, has a columnar shape extending around the eccentric shaft J2 that is parallel to the central shaft J1 and is eccentric with respect to the central shaft J1. The motor shaft 41 is cylindrical and extends around a central axis J1 except for the eccentric shaft 41 a.

The rotor body 42 is fixed to the motor shaft 41. The rotor body 42 includes: a rotor core fixed to the motor shaft 41; and a rotor magnet fixed to an outer peripheral portion of the rotor core.

The stator 43 is disposed radially outward of the rotor body 42 with a gap therebetween. The stator 43 is annular surrounding the radially outer side of the rotor body 42. The stator 43 includes, for example, a stator core, a plurality of insulators (insulators), and a plurality of coils. Each coil is fitted to a tooth of the stator core via an insulator.

The magnet holder 46 has an annular shape centered on the central axis J1. The magnet holder 46 is fixed to the outer peripheral surface of the upper end of the motor shaft 41. The motor portion sensor magnet 45 has an annular plate shape centered on the central axis J1. The plate surface of the motor-section sensor magnet 45 is orthogonal to the axial direction Z. The motor portion sensor magnet 45 is fixed to a radially outer peripheral edge portion of an upper surface of the magnet holder 46. Thus, the motor-section sensor magnet 45 is attached to the motor shaft 41 via the magnet holder 46. In the present embodiment, the motor portion sensor magnet 45 faces the lower surface of the circuit board 70 in the axial direction Z with a gap therebetween.

The speed reduction mechanism 50 is connected to the motor unit 40. In the present embodiment, the speed reduction mechanism 50 is coupled to the lower side of the motor shaft 41. The speed reduction mechanism 50 is disposed below the rotor body 42 and the stator 43. The reduction mechanism 50 has an external gear 51, an internal gear 52, and an output gear 53. The speed reduction mechanism 50 may be connected to the upper side of the motor shaft 41.

The external gear 51 has a circular plate shape extending in the radial direction of the eccentric shaft J2 around the eccentric shaft J2 of the eccentric shaft portion 41 a. A gear portion is provided on the radially outer surface of the outer gear 51. The external gear 51 is connected to the motor shaft 41 via a third bearing 44 c. Thereby, the speed reduction mechanism 50 is coupled to the motor shaft 41. The external gear 51 is fitted to the outer ring of the third bearing 44c from the radially outer side. Thereby, the third bearing 44c connects the motor shaft 41 and the external gear 51 to be relatively rotatable around the eccentric shaft J2.

The external gear 51 has a plurality of holes 51a penetrating the external gear 51 in the axial direction Z. Although not shown, the plurality of holes 51a are arranged at equal intervals in the circumferential direction around the eccentric shaft J2. The hole 51a has a circular shape when viewed in the axial direction Z.

The internal gear 52 surrounds the radially outer side of the external gear 51. The gear portion of the internal gear 52 meshes with the gear portion of the external gear 51. The ring gear 52 is annular with the center axis J1 as the center. The outer peripheral portion of the internal gear 52 is formed into a polygonal shape such as a regular dodecagon, for example, and is fixed to the second lid member 14 described later in a non-rotating state.

The output gear 53 has an output gear body 53a and a plurality of pins 53 b. The output gear body 53a is disposed above the external gear 51 and the internal gear 52. The output gear main body 53a has a circular ring plate shape extending in the radial direction around the center axis J1. A gear portion is provided on the radially outer side surface of the output gear body 53 a. The output gear body 53a is connected to the motor shaft 41 via a fourth bearing 44 d.

The plurality of pins 53b are cylindrical protruding downward from the lower surface of the output gear body 53 a. Although not shown, the plurality of pins 53b are arranged at equal intervals in the circumferential direction around the circumference. The pin 53b has an outer diameter smaller than the inner diameter of the hole 51 a. The plurality of pins 53b are inserted into the plurality of holes 51a from the upper side, respectively. The outer peripheral surface of the pin 53b is inscribed in the inner peripheral surface of the hole 51 a. The inner peripheral surface of the hole 51a supports the external gear 51 via the pin 53b so as to be swingable around the central axis J1.

The output portion 60 is a portion that outputs the driving force of the electric actuator 10. The output unit 60 is disposed radially outward of the motor unit 40. The output unit 60 includes an output shaft 61, a drive gear 62, an output unit sensor magnet 63, and a magnet holder 64.

The output shaft 61 is cylindrical and extends in the axial direction Z. As described above, the output shaft 61 extends in the same direction as the motor shaft 41, and therefore the structure of the reduction mechanism 50 that transmits the rotation of the motor shaft 41 to the output shaft 61 can be simplified. The output shaft 61 is coupled to the motor shaft 41 via the reduction mechanism 50. In the present embodiment, the output shaft 61 is cylindrical with the output center axis J3 as the center. The output center axis J3 is parallel to the center axis J1 and is disposed radially away from the center axis J1. That is, the motor shaft 41 and the output shaft 61 are disposed apart from each other in the radial direction of the motor shaft 41. Therefore, the electric actuator 10 can be downsized in the axial direction Z as compared with the case where the motor shaft 41 and the output shaft 61 are arranged in the axial direction Z. The motor shaft 41 and the output shaft 61 may be arranged in the axial direction Z.

The output shaft 61 is open on the lower side. The output shaft 61 has a spline groove on an inner peripheral surface. The output shaft 61 is disposed at a position overlapping the rotor body 42 in the radial direction of the motor shaft 41. A driven shaft DS is inserted into the output shaft 61 from below and coupled thereto. More specifically, the output shaft 61 and the driven shaft DS are coupled by fitting a spline portion provided on the outer peripheral surface of the driven shaft DS into a spline groove provided on the inner peripheral surface of the output shaft 61. The driving force of the electric actuator 10 is transmitted to the driven shaft DS via the output shaft 61. Thereby, the electric actuator 10 rotates the driven shaft DS about the output center axis J3.

The drive gear 62 is fixed to the output shaft 61 and meshes with the output gear 53. In the present embodiment, the drive gear 62 is fixed to the outer peripheral surface of the output shaft 61. The drive gear 62 extends from the output shaft 61 toward the output gear 53. Although not shown, the drive gear 62 is a sector gear in a plan view. The drive gear 62 has a gear portion at an end portion on the output gear 53 side. The gear portion of the drive gear 62 meshes with the gear portion of the output gear 53.

The magnet holder 64 is a substantially cylindrical member extending in the axial direction Z about the output center axis J3. The magnet holder 64 is open on both sides in the axial direction. The magnet holder 64 is fixed to the upper portion of the output shaft 61. In the case of the present embodiment, the magnet holder 64 is disposed radially outward of the second bearing 44b of the motor unit 40. The magnet holder 64 partially overlaps the circuit board 70 when viewed in the axial direction Z. The magnet holder 64 is disposed below the circuit board 70. The output shaft 61 penetrates the magnet holder 64 in the axial direction Z. The output shaft 61 is press-fitted into the inside of the magnet holder 64.

The output portion sensor magnet 63 has an annular shape centered on the output center axis J3. The output portion sensor magnet 63 is fixed to the outer peripheral portion of the upper surface of the magnet holder 64. The magnet holder 64 is fixed to the output shaft 61, and the sensor magnet 63 for the output portion is fixed to the output shaft 61 via the magnet holder 64. The output portion sensor magnet 63 faces the lower surface of the circuit board 70 with a gap therebetween.

The upper end of the output shaft 61 protrudes above the magnet holder 64. The upper end of the output shaft 61 passes through the side end surface of the circuit board 70 and protrudes above the circuit board 70. An operation portion OP to which a tool can be fitted is provided at an upper end portion of the output shaft 61. The operation portion OP is, for example, a quadrangular prism or a hexagonal prism extending along the output center axis J3.

When the motor shaft 41 rotates about the central axis J1, the eccentric shaft 41a revolves in the circumferential direction around the central axis J1. The revolution of the eccentric shaft portion 41a is transmitted to the external gear 51 via the third bearing 44c, and the external gear 51 oscillates while changing the inscribed position of the inner peripheral surface of the hole 51a and the outer peripheral surface of the pin 53 b. Thereby, the meshing position of the gear portion of the external gear 51 and the gear portion of the internal gear 52 changes in the circumferential direction. Therefore, the rotational force of the motor shaft 41 is transmitted to the internal gear 52 via the external gear 51.

Here, in the present embodiment, the internal gear 52 is fixed and does not rotate. Therefore, the external gear 51 rotates about the eccentric shaft J2 due to 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 41. The rotation of the external gear 51 about the eccentric shaft J2 is transmitted to the output gear 53 via the hole 51a and the pin 53 b. Thereby, the output gear 53 rotates about the center shaft J1. The rotation of the motor shaft 41 is decelerated 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 center shaft J3. Thereby, the output shaft 61 fixed to the drive gear 62 rotates about the output center axis J3. In this way, the rotation of the motor unit 40 is transmitted to the output unit 60 via the speed reduction mechanism 50.

The housing 11 accommodates the motor unit 40, the speed reduction mechanism 50, the output unit 60, the circuit board 70, and the bus bar unit 90. The housing 11 includes a housing main body 12 that is open on the upper side and polygonal in plan view, a first lid member 13 fixed to an upper opening 12a of the housing main body 12, and a second lid member 14 fixed to a lower opening 12b of the housing main body 12.

The housing body 12 includes a tubular outer wall portion 30 forming a housing of the electric actuator 10, a bottom wall portion 31 extending radially inward from a lower end portion of the outer wall portion 30, a motor housing portion 32 provided on the bottom wall portion 31, and an output shaft holding portion 33. That is, the housing 11 has an outer wall portion 30, a bottom wall portion 31, a motor case portion 32, and an output shaft holding portion 33.

As shown in fig. 1, in the present embodiment, the outer wall portion 30 has a pentagonal tubular shape when viewed in the axial direction Z. As shown in fig. 2, the outer wall portion 30 surrounds the motor housing portion 32 from the radially outer side. The upper opening of the outer wall 30 is an upper opening 12a of the housing body 12. As shown in fig. 3, a connector mounting portion 34 is provided on an outer side surface of a wall portion 30a on one side (+ Y side) in the projecting direction among the outer wall portions 30. The wall portion 30a is a wall portion of the housing 11 and extends in the width direction X.

The connector mounting portion 34 projects to one side (+ Y side) of the projecting direction. In the present embodiment, the connector mounting portion 34 has a rectangular shape with rounded corners that are long in the width direction X. One of the surfaces of the connector mounting portion 34 in the projecting direction is a mounting surface 34a to which a connector assembly 80 described later is mounted. The mounting surface 34a is a flat surface orthogonal to the projecting direction Y.

The connector mounting portion 34 is provided with a through hole 35 that penetrates the wall portion 30a in the projecting direction Y. That is, the housing 11 has a through-hole 35 penetrating the wall portion 30a of the housing 11 in the projecting direction Y, and the through-hole 35 is provided in the outer wall portion 30. The through-hole 35 is a circular hole when viewed in the projecting direction Y. The through-hole 35 is provided in the center portion of the connector mounting portion 34 in the width direction X. The edge of one side (+ Y side) of the protruding direction of the through-hole 35 is chamfered. Thus, the end portion of the through-hole 35 on one side in the protruding direction becomes a diameter-enlarged portion whose inner diameter becomes larger toward one side in the protruding direction.

The connector mounting portion 34 is provided with a plurality of female screw holes 34 b. A bolt 88 for fixing the connector assembly 80 is screwed into the internal threaded hole 34 b. In the present embodiment, two female screw holes 34b are provided on both sides of the through-hole 35 in the width direction X in the axial direction Z. The internal diameter of the internally threaded hole 34b is smaller than the internal diameter of the through-hole 35.

As shown in fig. 4, a seal groove portion 36 recessed downward is provided at an upper end portion of the outer wall portion 30. The seal groove portion 36 is annular and surrounds the upper opening of the outer wall portion 30. A hardened liquid gasket 37 is provided inside the seal groove portion 36. The liquid gasket 37 is in contact with the groove bottom surface of the seal groove 36 and the lower end of the first lid member 13 to seal between the case body 12 and the first lid member 13.

As shown in fig. 2, the bottom wall 31 has an opening that opens on the lower side. A cylindrical wall 31a protruding downward from the bottom wall 31 is provided at the periphery of the opening of the bottom wall 31. The opening surrounded by the cylindrical wall 31a is an opening 12b on the lower side of the case body 12. The motor housing portion 32 and the output shaft holding portion 33 are provided on the upper surface of the bottom wall portion 31.

The motor housing portion 32 is a cylindrical shape surrounding the motor portion 40 from the radially outer side. In the present embodiment, the motor case portion 32 is cylindrical and opens downward around the center axis J1. The motor housing portion 32 holds the motor portion 40 inside. More specifically, the stator 43 of the motor unit 40 is fixed to the inner peripheral surface of the motor case 32. The motor case portion 32 includes a cylindrical portion 32b extending upward from the bottom wall portion 31, and a partition wall 32a in the form of an annular plate extending radially inward from an upper end of the cylindrical portion 32 b.

The partition wall 32a has a bearing holding portion 32c at the center as viewed in the axial direction Z. The bearing holding portion 32c is cylindrical and extends in the axial direction Z. The second bearing 44b is held by the inner peripheral surface of the bearing holding portion 32 c. By the partition wall 32a also serving as the bearing holder, the electric actuator 10 can be prevented from being enlarged in the axial direction Z.

The output shaft holding portion 33 is cylindrical and extends upward from the bottom wall portion 31. A part of the side surface of the output shaft holding portion 33 is connected to the side surface of the motor housing portion 32. The output shaft holding portion 33 has a hole portion 33a penetrating the output shaft holding portion 33 in the axial direction Z. A cylindrical bush (bush)65 is fitted inside the hole 33 a.

The bushing 65 has a flange portion protruding outward in the radial direction about the output center axis J3 at the lower end portion. The flange portion of the bushing 65 is supported from below by the upper surface of the drive gear 62. The output shaft 61 is fitted inside the bushing 65. The bush 65 rotatably supports the output shaft 61 about the output center shaft J3.

The first cover member 13 is a container-shaped metal member having a receiving recess 13b opened on the lower side. The first cover member 13 and the housing body 12 are fastened by a plurality of bolts penetrating the first cover member 13 in the axial direction Z. The electronic component mounted on the upper surface of the circuit board 70 and the operation portion OP of the driven shaft DS are accommodated in the accommodation recess 13 b. In the housing recess 13b, for example, a capacitor, a transistor, and the like mounted on the circuit board 70 are housed.

The first cover member 13 has an opening 13c located above the output shaft 61. A detachable cap 15 is attached to the opening 13 c. The cap 15 is attached to the opening 13c by, for example, screwing a male screw portion provided on the outer peripheral surface into a female screw portion provided on the inner peripheral surface of the opening 13 c. By detaching the cap 15, the tool can be connected to the operation part OP from the outside of the electric actuator 10 via the opening part 13 c.

The second cover member 14 covers the reduction mechanism 50 from the lower side. In the present embodiment, the second lid member 14 is made of metal. The second lid member 14 includes a cylindrical inner tube portion 14a centered on the central axis J1, a corner tube-shaped outer tube portion 14b centered on the central axis J1, a fixed tube portion 14c fixed to the housing body 12, a bottom wall portion 14d located at the lower end of the inner tube portion 14a, and an opening portion 14e overlapping the output portion 60 in the axial direction Z.

The inner tube portion 14a has a smaller inner diameter than the outer tube portion 14b and is located below the outer tube portion 14 b. A first bearing 44a is held radially inside the inner tubular portion 14 a. The preload member 47 is disposed between the first bearing 44a and the bottom wall portion 14d in the axial direction Z. That is, the electric actuator 10 includes the pre-pressing member 47. The pre-pressing member 47 is an annular wave washer (wave washer) extending in the circumferential direction. The preload member 47 contacts the upper surface of the bottom wall portion 14d and the lower end of the outer ring of the first bearing 44 a. The preload member 47 applies upward preload to the outer wheel of the first bearing 44 a.

The internal gear 52 is held radially inside the outer tubular portion 14 b. The fixed cylinder portion 14c is fixed to the outer peripheral surface of the cylindrical wall 31a of the housing main body 12. Thereby, the second cover member 14 is fixed to the case body 12. The second cover member 14 supports, from below, a shaft flange portion 6lb extending radially outward from the outer peripheral surface of the output shaft 61. The lower end of the output shaft 61 passes through the opening 14e of the second cover member 14 and is exposed downward.

The bus bar unit 90 is disposed on the upper surface of the partition wall 32 a. The bus bar unit 90 includes a ring-plate-shaped bus bar holder 91 and a plurality of bus bars 92 held by the bus bar holder 91. The bus bars 92 are provided with 6 pieces, for example. In the case of the present embodiment, the bus bar holder 91 is manufactured by insert molding using the bus bar 92 as an insert member.

An end portion 92a of one side of the bus bar 92 protrudes upward from the upper surface of the bus bar holder 91. In the present embodiment, one end portion 92a of the bus bar 92 is a straight strip extending in the axial direction Z, and penetrates the circuit board 70 from the lower side to the upper side. The end portion 92a is electrically connected to the circuit board 70 by a connection method such as soldering, welding, or press-fitting at a position penetrating the circuit board 70. Although not shown, the other end of the bus bar 92 grips a coil lead wire drawn from the coil of the stator 43 and is connected to the coil by welding or fusing. Thereby, the stator 43 and the circuit board 70 are electrically connected via the bus bar 92.

In the present embodiment, the circuit board 70 is disposed above the motor unit 40 and the bus bar unit 90. The circuit board 70 has a plate surface perpendicular to the axial direction Z. Although not shown, the shape of the circuit board 70 as viewed along the axial direction Z is substantially square. The circuit board 70 is electrically connected to the coils of the stator 43 via the bus bar unit 90. That is, the circuit board 70 is electrically connected to the motor unit 40. In the present embodiment, the circuit board 70 is housed inside the opening 12a of the case body 12. The circuit board 70 is covered with the first cover member 13 from above.

In the present embodiment, the circuit board 70 is fastened to the partition wall 32a of the motor case 32 by a plurality of bolts 96. The bolt 96 penetrates the circuit board 70 and the bus bar holder 91 in the axial direction Z and is fastened to the screw hole of the partition wall 32 a. According to the above configuration, the circuit board 70 and the bus bar holder 91 are fastened together and integrated by the common bolt 96. This can suppress variation in the distance between the circuit board 70 and the bus bar holder 91 in the axial direction Z due to vibration during operation. As a result, the load applied to the connection portion of the bus bar 92 and the circuit substrate 70 can be suppressed. The bolts 96 are provided with three, for example.

In addition, in the present embodiment, the distance in the axial direction Z between the bus bar holder 91 and the circuit board 70 can be reduced as compared with the case where the bus bar holder 91 and the circuit board 70 are fixed to the partition wall 32a using different bolts. Therefore, the electric actuator 10 can be prevented from being increased in size due to the provision of the bus bar holder 91.

The motor sensor 71 is fixed to the lower surface of the circuit board 70. More specifically, the motor portion sensor 71 is fixed to a portion of the lower surface of the circuit board 70 that faces the motor portion sensor magnet 45 in the axial direction Z with a gap therebetween. The motor sensor 71 is a magnetic sensor that detects the magnetic field of the motor sensor magnet 45. The motor sensor 71 is a hall element such as a hall Integrated Circuit (IC). In the present embodiment, three motor portion sensors 71 are provided along the circumferential direction. The motor sensor 71 detects the rotation position of the motor sensor magnet 45 by detecting the magnetic field of the motor sensor magnet 45, thereby detecting the rotation of the motor shaft 41.

The output portion sensor 72 is fixed to the lower surface of the circuit board 70. More specifically, the output section sensor 72 is fixed to a portion of the lower surface of the circuit board 70 that faces the output section sensor magnet 63 with a gap therebetween in the axial direction Z. The output unit sensor 72 is a magnetic sensor that detects the magnetic field of the output unit sensor magnet 63. The output sensor 72 is a hall element such as a hall IC, for example. The output portion sensor 72 detects the rotation position of the output portion sensor magnet 63 by detecting the magnetic field of the output portion sensor magnet 63, thereby detecting the rotation of the output shaft 61.

As shown in fig. 1, the electric actuator 10 further includes a connector assembly 80 fixed to the housing 11. In the present embodiment, the connector assembly 80 is fixed to the outer wall portion 30. More specifically, the connector assembly 80 is fixed to the connector mounting portion 34 provided on the outer wall portion 30. A control device, not shown, for controlling the electric actuator 10 is connected to the connector assembly 80. The control device includes a power supply that supplies electric power to the electric actuator 10. As shown in fig. 4 to 7, the connector assembly 80 includes a connector member 81, a sealing member 82, and a wiring member 83. In fig. 7, the first cover member 13 and the circuit board 70 are not shown.

As shown in fig. 4, the connector member 81 is a portion that penetrates the through-hole 35 and is fixed to the housing 11. In the present embodiment, the connector member 81 is made of resin. The connector member 81 is manufactured by insert molding using an insert member as the wiring member 83 and a cylindrical member 85b described later, for example. The connector member 81 includes a body 81a, a seal holding portion 86, and a terminal holding portion 87.

The body portion 81a is a portion that protrudes from the wall portion 30a of the housing 11 to one side (+ Y side) in the protruding direction and is located outside the housing 11. The main body 81a has a connecting portion 84 and a flange portion 85. The connection portion 84 is a portion connected to a control device not shown. As shown in fig. 1, the connecting portion 84 has a substantially rectangular tubular shape.

As shown in fig. 4, the connecting portion 84 has a bottom portion 84a and a cylindrical portion 84 b. The bottom portion 84a is a portion on the other side (Y side) in the protruding direction in the connecting portion 84. The cylindrical portion 84b is a portion of the connecting portion 84 on one side (+ Y side) in the protruding direction. The cylindrical portion 84b projects from the bottom portion 84a toward one side in the projecting direction. The cylindrical portion 84b is open on one side in the projecting direction. As shown in fig. 5, a rib 84c extending in the projecting direction Y is provided on the upper surface of the connecting portion 84. The ribs 84c are provided in a pair at intervals in the width direction X.

The flange portion 85 is continuous with the other side (Y side) of the connection portion 84 in the protruding direction. The flange 85 is provided at the other side (Y side) of the main body 81a in the projecting direction. The flange 85 projects and expands more in the width direction X and the axial direction Z than the connecting portion 84. The flange 85 is a substantially rectangular parallelepiped shape elongated in the width direction X and flat in the projection direction Y. The flange 85 has a plurality of fixing holes 85a penetrating the flange 85 in the projecting direction Y. Fixing hole 85a is a circular hole. In the present embodiment, two fixing hole portions 85a are provided at both ends of the flange portion 85 in the width direction X in the axial direction Z. A tubular member 85b is embedded in each fixing hole 85 a. The tubular member 85b is a cylindrical metal member that is open on both sides in the protruding direction Y.

As shown in fig. 1 and 4, flange 85 is fixed to wall 30a of case 11 in contact with the outer surface of case 11. In the present embodiment, the flange portion 85 contacts the mounting surface 34a from one side (+ Y side) in the projecting direction. The flange portion 85 is fixed to the connector mounting portion 34 as follows: a bolt 88 inserted into the cylindrical member 85b from one side in the protruding direction penetrates the flange portion 85 and is screwed into each female screw hole 34 b. The end of the rib 84c on the other side in the protruding direction (Y side) is connected to the upper portion of the flange 85.

As shown in fig. 4 and 5, the seal holding portion 86 has a columnar shape protruding from the main body portion 81a toward the other side (the Y side) in the protruding direction. More specifically, the seal holding portion 86 protrudes from the flange portion 85 toward the other side in the protruding direction. In the present embodiment, the seal holding portion 86 has a cylindrical shape. A groove portion 86a is provided on the outer peripheral surface of the seal holding portion 86. The groove portion 86a is an annular groove provided around the outer peripheral surface of the seal holding portion 86. As shown in fig. 4, the seal holding portion 86 is inserted into the through-hole 35. In the present embodiment, the seal holding portion 86 is fitted in the through hole 35.

The terminal holding portion 87 is a columnar shape protruding from the sealing holding portion 86 toward the other side (Y side) in the protruding direction. The terminal holding portion 87 is positioned on the other side in the protruding direction than the through hole 35 and is positioned inside the housing 11. In the present embodiment, the terminal holding portion 87 is located between the motor case portion 32 and the outer wall portion 30 in the radial direction inside the housing body 12. Thus, the connector assembly 80 can be disposed radially outward of the motor unit 40, and the electric actuator 10 can be downsized in the axial direction Z. The terminal holding portion 87 is located below the circuit board 70.

As shown in fig. 5 and 6, in the present embodiment, the terminal holding portion 87 has a substantially quadrangular prism shape. As shown in fig. 6, the shape of the terminal holding portion 87 viewed from the other side (Y side) in the protruding direction is a rectangular shape elongated in the width direction X. The center axis J5 of the terminal holding portion 87 is eccentric upward with respect to the center axis J4 of the seal holding portion 86. The center axis J5 of the terminal holding portion 87 is an imaginary axis extending in the projecting direction Y and passing through a position which is the center of the terminal holding portion 87 in the width direction X and the center of the terminal holding portion 87 in the axial direction Z. The center axis J4 of the seal holding portion 86 is an imaginary axis extending in the projecting direction Y and passing through the center of the cylindrical seal holding portion 86. The central axis J4 and the central axis J5 are parallel to each other. In the present embodiment, the entire terminal holding portion 87 is located inside the seal holding portion 86 as viewed from the other side in the protruding direction, and overlaps the seal holding portion 86.

As shown in fig. 5 and 7, an inclined portion 87a inclined along the outer peripheral surface of the motor housing portion 32 is provided at the end portion on the other side (Y side) in the protruding direction of the terminal holding portion 87. Therefore, the terminal holding portion 87 can be prevented from interfering with the motor case portion 32 inside the housing 11. In the present embodiment, the inclined portion 87a is provided at a portion on one side (+ X side) in the width direction among end portions on the other side in the protruding direction of the terminal holding portion 87. The end surface on the other side in the protruding direction of the inclined portion 87a is a flat inclined surface that gradually comes closer to one side (+ Y side) in the protruding direction toward one side in the width direction.

As shown in fig. 4 and 5, the sealing member 82 is attached to the connector member 81. The sealing member 82 is annular and attached to the outer peripheral surface of the seal holding portion 86 so as to surround the seal holding portion 86. In the present embodiment, the seal member 82 has an annular shape centered on the central axis J4 of the seal holding portion 86. The sealing member 82 is, for example, an O-ring. Therefore, the seal member 82 can be easily manufactured at low cost, and the manufacturing cost of the electric actuator 10 can be easily reduced. In the present embodiment, the seal member 82 is fitted into the groove portion 86a and held by the seal holding portion 86.

As shown in fig. 4, the sealing member 82 is inserted into the penetration hole 35. The seal member 82 is sandwiched between the inner circumferential surface of the through-hole 35 and the groove bottom surface of the groove portion 86a, and is compressed and elastically deformed in the radial direction of the seal holding portion 86. Thereby, the sealing member 82 seals between the inner peripheral surface of the through-hole 35 and the outer peripheral surface of the seal holding portion 86. Therefore, the liquid such as water can be prevented from entering the inside of the housing 11 through the through-hole 35.

The wiring member 83 is held by the connector member 81. The wiring member 83 is partially embedded in the connector member 81 and held. In the present embodiment, the wiring member 83 is a metal bus bar. The wiring member 83 extends from the inside of the cylindrical portion 84b of the connecting portion 84 to the inside of the housing 11 through the bottom portion 84a, the flange portion 85, the seal holding portion 86, and the terminal holding portion 87 in this order.

One end portion 83a of the wiring member 83 protrudes from the bottom portion 84a of the connection portion 84 toward one side (+ Y side) in the protruding direction. The one end portion 83a is exposed to the inside of the tube portion 84 b. The one end portion 83a is electrically connected to a control device connected to the connector unit 80. The other end of the wiring member 83 is a terminal portion 83b that protrudes from the terminal holding portion 87 inside the housing 11 and is connected to the circuit board 70. The terminal portion 83b protrudes upward from the terminal holding portion 87. The terminal portion 83b penetrates into the hole 70a provided in the circuit board 70 and protrudes further than the circuit board 70. The hole 70a penetrates the circuit board 70 in the axial direction Z. Although not shown, the terminal portion 83b is fixed to the circuit board 70 by, for example, solder and is electrically connected to the circuit board 70. Thus, the wiring member 83 is electrically connected to the circuit board 70.

The upper end of the terminal portion 83b is located above the seal holding portion 86. The upper end of terminal portion 83b is located above flange 85. In the present embodiment, the upper end of the terminal portion 83b is a portion projecting to the uppermost side in the connector assembly 80. The upper end of the terminal portion 83b is located inside the first cover member 13.

In the present embodiment, a plurality of wiring members 83 are provided. As shown in fig. 5 and 7, for example, five wiring members 83 are provided. The upper end portions of the terminal portions 83b of the plurality of wiring members 83 are fitted to each other at the same position in the axial direction Z. At least two or more wiring members 83 among the plurality of wiring members 83 have terminal portions 83b arranged along the outer peripheral surface of the motor case portion 32.

In the present embodiment, the terminal portions 83b of the three wiring members 83 are arranged in a row along the outer peripheral surface of the motor case portion 32, i.e., in the circumferential direction, at the end portion on the other side (Y side) in the protruding direction of the terminal holding portion 87. The three wiring members 83 are arranged along the inclined portion 87 a. The terminal portions 83b of the remaining two wiring members 83 are arranged in a row along the outer peripheral surface of the motor case portion 32, i.e., the circumferential direction, on the radially outer side of the terminal portions 83b of the other three wiring members 83. By disposing the terminal portions 83b of the plurality of wiring members 83 in this manner, the plurality of terminal portions 83b can be disposed in a space-efficient manner with respect to the terminal holding portion 87 having the inclined portion 87 a.

As shown in fig. 8, a distance L1 in the axial direction Z between the lower end portion of the terminal holding portion 87 and the upper end portion of the terminal portion 83b is smaller than the inner diameter D of the through-hole 35. In addition, as shown in fig. 9, a dimension L3 in the projecting direction Y of a portion of the terminal holding portion 87 on one side (+ Y side) of the projecting direction with respect to the terminal portion 83b is larger than a dimension L2 in the projecting direction Y of the through-hole 35. In the case where a plurality of terminal portions 83b are provided as in the present embodiment, a portion of the terminal holding portion 87 located on one side in the protruding direction with respect to the terminal portions 83b is a portion located on one side in the protruding direction with respect to the terminal portions 83b located on the most protruding side.

A control device, not shown, is connected to the connector assembly 80, and a power supply of the control device supplies electric power to the motor unit 40 via the wiring member 83 and the circuit board 70. The output of the motor sensor 71 and the output of the output sensor 72 are transmitted to the control device via the wiring member 83 and the circuit board 70. The control device controls the motor unit 40 by adjusting the electric power supplied to the motor unit 40 based on the output of the motor unit sensor 71 and the output of the output unit sensor 72. In this manner, the control device, not shown, controls the electric actuator 10.

The method of manufacturing the electric actuator 10 of the present embodiment includes a connector mounting step S1, a substrate mounting step S2, and a cover member mounting step S3. The connector mounting step S1 is a step of mounting the connector assembly 80 to the housing 11. The connector mounting process S1 includes a first moving process S1a, a second moving process S1b, a third moving process S1c, and a fixing process S1 d. When the connector mounting step S1 is started, the motor unit 40 is housed in the housing body 12, and the circuit board 70 and the first cover member 13 are not assembled.

As shown in fig. 8, in the first moving step S1a, the worker or the like who manufactures the electric actuator 10 moves the connector assembly 80 to the other side in the protruding direction (the Y side) in a state where the center axis J4 of the seal holding portion 86 is eccentric downward with respect to the center axis J6 of the through-hole 35. The center axis J6 of the through-hole 35 is an imaginary axis extending in the projecting direction Y and passing through the center of the cylindrical through-hole 35. The central axis J6 is parallel to the central axes J4, J5. In the first moving step S1a, the worker or the like moves the connector assembly 80 to the other side in the protruding direction at the axial position where the upper end of the terminal portion 83b is positioned below the upper end of the through-hole 35 and the lower end of the terminal holding portion 87 is positioned above the lower end of the through-hole 35.

In the present specification, "operator" includes an operator, a device, and the like that perform each operation. Each operation may be performed only by the operator, only by the apparatus, or by both the operator and the apparatus.

As described above, in the present embodiment, the distance L1 in the axial direction Z between the lower end of the terminal holding portion 87 and the upper end of the terminal portion 83b is smaller than the inner diameter D of the through-hole 35. Therefore, by bringing the connector assembly 80 straight closer to the through-hole 35 along the projecting direction Y, the terminal holding portion 87 and the terminal portion 83b can be inserted into the through-hole 35 as shown in fig. 9. Therefore, when the terminal holding portion 87 and the terminal portion 83b are inserted into the through-hole 35, the terminal holding portion 87 and the terminal portion 83b can be easily inserted into the through-hole 35 without tilting the connector assembly 80 or the like. This effect is particularly useful when using the device and automating the job.

In the first moving step S1a, the worker or the like moves the connector assembly 80 to the other side in the protruding direction (the (-Y side) until the seal holding portion 86 comes into contact with the mounting surface 34 a. As described above, in the first moving step S1a, the operator or the like moves the connector assembly 80 to the other side in the protruding direction while the center axis J4 of the seal holding portion 86 is eccentric downward with respect to the center axis J6 of the through-hole 35, inserts the terminal holding portion 87 and the terminal portion 83b into the through-hole 35, and brings the seal holding portion 86 into contact with the outer surface of the housing 11.

As described above, in the present embodiment, the dimension L3 in the protruding direction Y of the portion of the terminal holding portion 87 located on one side (+ Y side) of the protruding direction of the terminal portion 83b is larger than the dimension L2 in the protruding direction Y of the through-hole 35. Therefore, at the point of time when the first movement step S1a ends, the terminal portion 83b is located on the other side (Y side) in the protruding direction than the through hole 35 and inside the outer wall portion 30.

Next, in the second moving step S1b, as shown in fig. 9 and 10, the worker or the like moves the connector assembly 80 upward until the center axis J4 of the seal holding portion 86 coincides with the center axis J6 of the through-hole 35. At this time, as described above, at the point of time when the first movement step S1a ends, the terminal portion 83b is positioned on the other side (Y side) in the protruding direction than the through hole 35. Therefore, in the second moving step S1b, even if the connector assembly 80 is moved straight upward, the terminal portions 83b do not interfere with the through-holes 35. Therefore, the second moving step S1b can be easily performed by making the dimension L3 of the terminal holding portion 87 larger than the dimension L2 of the through-hole 35 in the projecting direction Y.

Next, in the third moving step S1c, as shown in fig. 10 and 11, the worker or the like moves the connector assembly 80 to the other side (the Y side) in the projecting direction, inserts the seal holding portion 86 into the through hole 35, and brings the flange portion 85 into contact with the outer side surface of the housing 11. In the third moving step S1c of the present embodiment, the flange portion 85 comes into contact with the mounting surface 34 a. When the seal holding portion 86 to which the seal member 82 is attached is inserted into the through-hole 35, the seal member 82 is in contact with the inner peripheral surface of the through-hole 35 and is elastically deformed by compression. Thus, the sealing member 82 seals between the inner peripheral surface of the through-hole 35 and the outer peripheral surface of the seal holding portion 86.

Next, in the fixing step S1d, the worker or the like fixes the flange portion 85 to the housing 11. In the fixing step S1d of the present embodiment, the worker or the like inserts the bolt 88 into the cylindrical member 85b fitted in the fixing hole 85a from one side (+ Y side) in the protruding direction of the flange portion 85, and screws the bolt 88 into the female screw hole 34 b. Thereby, the flange portion 85 is fixed to the housing 11. Thereby, the connector mounting step S1 is completed, and the connector assembly 80 is fixed to the housing 11.

The substrate mounting step S2 is a step of mounting the circuit substrate 70. As shown in fig. 11 and 12, in the board mounting step S2, the worker or the like moves the circuit board 70 from the upper side to the lower side of the case body 12, and accommodates the circuit board 70 in the case body 12. At this time, the operator or the like inserts the terminal portion 83b into the hole 70a provided in the circuit board 70. In the board mounting step S2, the worker or the like fixes the terminal portion 83b inserted into the hole 70a provided in the circuit board 70 to the circuit board 70 by soldering.

The cover member mounting step S3 is a step of mounting the first cover member 13. As shown in fig. 12, in the cover member mounting step S3, the worker or the like applies the uncured liquid gasket 37 into the seal groove portion 36 using the application device C. Next, in the cover member attaching step S3, the worker or the like fixes the first cover member 13 to the upper side of the housing main body 12. Thus, by hardening the liquid gasket 37 that is not hardened, the space between the housing body 12 and the first lid member 13 can be sealed.

According to the present embodiment, as in the connector mounting step S1, the seal holding portion 86 to which the seal member 82 is mounted is inserted into the through-hole 35, whereby the through-hole 35 and the connector assembly 80 can be easily sealed. Therefore, workability of the sealing operation can be improved as compared with, for example, a case where a liquid gasket is applied between the connector assembly 80 and the housing 11 for sealing. Therefore, the assembling workability of the electric actuator 10 can be improved, and the reduction in the productivity of the electric actuator 10 can be suppressed. Further, the sealing property is not varied by the amount of application as in the case of a liquid gasket, and the sealing property is easily ensured. Thereby, in the electric actuator 10, the sealability between the housing 11 and the connector member 81 can be ensured, and the reduction in productivity can be suppressed.

For example, when the central axis J5 of the terminal holding portion 87 coincides with the central axis J4 of the seal holding portion 86, the axial position of the terminal holding portion 87 is located below the above-described position. In this case, if the position of the circuit board 70 in the axial direction Z with respect to the motor unit 40 or the like is not changed, it is necessary to further increase the protruding height of the terminal portion 83b protruding upward from the terminal holding portion 87 in order to connect the terminal portion 83b to the circuit board 70. However, in this case, the distance L1 in the axial direction Z between the lower end of the terminal holding portion 87 and the upper end of the terminal portion 83b becomes large. Therefore, the terminal holding portion 87 and the terminal portion 83b are inserted into the through-hole 35, and the inner diameter D of the through-hole 35 is likely to increase. When the inner diameter D of the through hole 35 is increased, the size of the outer wall portion 30 provided in the through hole 35 in the axial direction Z is also increased, and the electric actuator 10 may be increased in size in the axial direction Z as a whole.

In contrast, according to the present embodiment, the center axis J5 of the terminal holding portion 87 is eccentric upward with respect to the center axis J4 of the seal holding portion 86. Therefore, the protrusion height of the terminal portion 83b can be suppressed to be small, and the terminal portion 83b can be connected to the circuit board 70. Thus, the distance L1 in the axial direction Z between the lower end of the terminal holding portion 87 and the upper end of the terminal portion 83b can be reduced, and the inner diameter D of the through-hole 35 can be made relatively small. Therefore, the electric actuator 10 can be prevented from being enlarged in the axial direction Z.

As described above, in the electric actuator 10 which is miniaturized by disposing the motor shaft 41 and the output shaft 61 apart from each other in the radial direction of the motor shaft 41 as in the present embodiment, an effect of suppressing an increase in size of the electric actuator 10 in the axial direction Z can be obtained particularly effectively.

The present invention is not limited to the embodiment described above, and other configurations can be adopted within the scope of the technical idea of the present invention. The type of the sealing member is not particularly limited as long as it is annular and is attached to the outer peripheral surface of the seal holding portion so as to surround the seal holding portion. The sealing member may be an X-ring, for example. The seal member can be arbitrarily attached to the outer peripheral surface of the seal holding portion.

The center axis of the terminal holding portion may not be eccentric or may be uniform with respect to the center axis of the seal holding portion. The distance L1 in the axial direction Z between the lower end of the terminal holding portion and the upper end of the terminal portion may be the same as or larger than the inner diameter D of the through-hole. Even in such a case, for example, the terminal holding portion and the terminal portion can be inserted into the through-hole by tilting the connector assembly and inserting the connector assembly into the through-hole. The dimension of the portion of the terminal holding portion on the side of the terminal portion in the protruding direction Y may be the same as or smaller than the dimension of the through hole in the protruding direction Y.

The procedure of the connector mounting step S1 is not limited to the procedure of the above-described embodiment, and is not particularly limited as long as the connector assembly can be mounted on the housing. The connector assembly may be inserted into the through-hole in an inclined manner, and the seal holding portion may be inserted into the through-hole in one movement step.

In the above embodiment, the first direction is a direction orthogonal to the axial direction Z of the motor unit, and the second direction is a direction parallel to the axial direction Z of the motor unit, but the present invention is not limited thereto. The first direction and the second direction are not particularly limited. The first direction may be a direction parallel to the axial direction Z of the motor unit. The second direction may be a direction orthogonal to the axial direction Z of the motor unit.

The electric actuator to which the present invention is applied may be a motor that does not include a speed reduction mechanism, as long as it is a device that can move a target object by supplying electric power. The electric actuator may be an electric pump including a pump unit driven by an electric motor unit. The application of the electric actuator is not particularly limited, and the electric actuator may be mounted in a vehicle or other than a vehicle. In the present specification, the respective components described above may be appropriately combined within a range not contradictory to each other.

Claims (10)

1. An electric actuator, comprising:

a motor section;

a circuit board electrically connected to the motor unit;

a housing accommodating the motor unit and the circuit board; and

a connector assembly fixed to the housing, and

the housing has a through-hole penetrating a wall portion of the housing in a first direction,

the connector assembly has:

a connector member inserted into the through hole and fixed to the housing;

a wiring member held by the connector member and electrically connected to the circuit board; and

a sealing member mounted to the connector member,

the connector member has:

a body portion protruding from a wall portion of the housing to one side of the first direction and located outside the housing;

a seal holding portion which is a columnar shape protruding from the main body portion to the other side in the first direction and is inserted into the through hole; and

a terminal holding portion which is a columnar shape protruding from the seal holding portion to the other side in the first direction and is positioned inside the housing,

the body portion has a flange portion provided at an end portion of the other side in the first direction in the body portion,

the flange portion is fixed to a wall portion of the housing in contact with an outer side surface of the housing,

the wiring member has a terminal portion which protrudes from the terminal holding portion inside the housing and is connected to the circuit board,

the sealing member is annular and attached to the outer peripheral surface of the seal holding portion so as to surround the seal holding portion, and seals between the inner peripheral surface of the through hole and the outer peripheral surface of the seal holding portion.

2. The electric actuator according to claim 1, wherein the terminal portion protrudes from the terminal holding portion to one side of a second direction orthogonal to the first direction,

an end portion of one of the terminal portions in the second direction is located closer to one of the second direction than the seal holding portion,

the center axis of the terminal holding portion is eccentric to one side of the second direction with respect to the center axis of the seal holding portion.

3. The electric actuator according to claim 2, wherein a distance in the second direction between an end portion of the other side in the second direction in the terminal holding portion and an end portion of one side in the second direction in the terminal portion is smaller than an inner diameter of the through-hole.

4. The electric actuator according to claim 2 or 3, wherein a dimension of a portion of the terminal holding portion on one side of the first direction with respect to the terminal portion in the first direction is larger than a dimension of the through-hole in the first direction.

5. The electric actuator according to claim 2, wherein the first direction is a direction orthogonal to an axial direction of the motor portion,

the second direction is a direction parallel to an axial direction of the motor portion,

the housing has:

a cylindrical motor housing portion surrounding the motor portion from a radially outer side; and

an outer wall portion surrounding the motor case portion from a radially outer side, provided with the through hole,

the terminal holding portion is located between the motor case portion and the outer wall portion in a radial direction.

6. The electric actuator of claim 5, wherein the motor housing portion is cylindrical,

an inclined portion that is inclined along an outer peripheral surface of the motor housing portion is provided at an end portion of the terminal holding portion on the other side in the first direction.

7. The electric actuator according to claim 6, wherein the wiring member is provided in plurality,

in at least two or more of the plurality of wiring members, the terminal portions are arranged along an outer peripheral surface of the motor case portion.

8. The electric actuator of claim 1, wherein the sealing member is an O-ring.

9. The electric actuator of claim 1, further comprising:

a speed reduction mechanism connected to the motor unit; and

and an output unit that transmits rotation of the motor unit via the speed reduction mechanism.

10. The electric actuator as recited in claim 9, wherein the motor portion has a motor shaft extending in an axial direction,

the output portion has an output shaft extending in an axial direction,

the output shaft is coupled to the motor shaft via the speed reduction mechanism,

the motor shaft and the output shaft are disposed apart from each other in a radial direction of the motor shaft.

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