CN221978726U - Electric actuator - Google Patents

Abstract

The utility model provides an electric actuator. It is provided with: a motor part, which has a motor shaft that can rotate around a motor shaft; an output shaft, which can rotate around the output shaft extending in a direction intersecting the motor shaft direction; a transmission mechanism, which is connected to the motor shaft and the output shaft, and transmits the rotation of the motor shaft to the output shaft; a substrate, whose plate surface faces a first direction orthogonal to the motor shaft direction; a first magnet, which is fixed to the outer peripheral surface of the motor shaft; a second magnet, which is fixed to the end of the output shaft in the output shaft direction; a first magnetic sensor, which can detect the magnetic field of the first magnet; and a second magnetic sensor, which can detect the magnetic field of the second magnet. The substrate is arranged on the side closer to the first direction than the first magnet and the second magnet. The first magnetic sensor and the second magnetic sensor are mounted on the substrate. The first magnetic sensor is opposite to the outer peripheral surface of the first magnet, and the second magnetic sensor is opposite to the second magnet.

Description

Electric Actuator

Technical Field

The utility model relates to an electric actuator.

Background Art

Conventionally, there is known a motor having a structure in which a rotation detection sensor for detecting the rotation of the motor is mounted on a sensor substrate provided separately from a control substrate for supplying power to the motor, and the control substrate and the sensor substrate are electrically connected via terminals (for example, Patent Document 1).

Prior art literature

Patent Document 1: Japanese Patent Application Publication No. 2008-141912

In the above motor, since the control substrate and the rotation detection sensor are electrically connected via the sensor substrate and the terminal, the number of parts of the motor increases, and the manufacturing cost of the motor increases. In addition, in the manufacturing process of the motor, since the terminal needs to be connected to the control substrate and the sensor substrate by soldering, the manufacturing man-hours of the motor increase. Furthermore, in the case of providing a sensor for detecting the rotation of the output shaft, it may be necessary to additionally install a substrate for mounting the sensor and terminals for electrically connecting the substrate to the control substrate, which may further increase the manufacturing cost and manufacturing man-hours of the motor.

Utility Model Content

In view of the above circumstances, one of the objects of the present invention is to provide an electric actuator capable of suppressing an increase in manufacturing cost and manufacturing man-hours.

One mode of the electric actuator of the utility model comprises: a motor part having a motor shaft rotatable around a motor shaft; an output shaft rotatable around an output shaft extending in a direction intersecting the motor shaft direction; a transmission mechanism connected to the motor shaft and the output shaft to transmit the rotation of the motor shaft to the output shaft; a substrate, a plate surface of which faces a first direction orthogonal to the motor shaft direction; a first magnet fixed to the outer peripheral surface of the motor shaft; a second magnet fixed to the end of the output shaft in the output shaft direction; a first magnetic sensor capable of detecting the magnetic field of the first magnet; and a second magnetic sensor capable of detecting the magnetic field of the second magnet. The substrate is arranged on the side closer to the first direction than the first magnet and the second magnet. The first magnetic sensor and the second magnetic sensor are mounted on the substrate. The first magnetic sensor faces the outer peripheral surface of the first magnet, and the second magnetic sensor faces the second magnet.

The first magnet is annular with the motor shaft as the center, and different magnetic poles are adjacently arranged on the first magnet along the circumferential direction with the motor shaft as the center, and different magnetic poles are adjacently arranged on the second magnet along the circumferential direction with the output shaft as the center.

The substrate includes a first substrate portion on which the first magnetic sensor and the second magnetic sensor are mounted, and at least a portion of the first substrate portion overlaps with the motor portion when viewed from the motor shaft direction.

The substrate has a second substrate portion, which extends from a portion of the first substrate portion on one side of a second direction orthogonal to both the motor shaft direction and the first direction to one side of the motor shaft direction, and when viewed from the second direction, at least a portion of the second substrate portion overlaps with the motor portion.

A driving circuit unit for driving the motor unit is provided on the substrate.

The transmission mechanism includes: a drive input gear portion, which is arranged on the outer peripheral surface of the motor shaft; and an output gear, which is provided with an output gear portion and can rotate around the output shaft, the drive input gear portion and the output gear portion are meshed with each other, and the output gear is connected to the output shaft.

The transmission mechanism is a speed reduction mechanism that reduces the speed of rotation of the motor shaft and transmits the reduced speed rotation to the output shaft.

The effects of the utility model are as follows.

According to one aspect of the present invention, in the electric actuator, it is possible to suppress an increase in manufacturing cost and manufacturing man-hours.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view showing an electric actuator according to an embodiment.

FIG. 2 is a perspective view showing a part of the electric actuator according to the embodiment.

FIG. 3 is a cross-sectional view showing the electric actuator according to the embodiment, and is a cross-sectional view taken along line III-III in FIG. 1 .

FIG. 4 is a plan view showing a transmission mechanism of the electric actuator according to the embodiment.

In the figure: 1—electric actuator, 20—motor part, 24—motor shaft, 25—drive input gear part, 30—transmission mechanism, 31—output gear, 31b—output gear part, 38—output shaft, 70—substrate, 70b—first substrate part, 70c—second substrate part, 70d—drive circuit part, 76—first magnetic sensor, 77—second magnetic sensor, 81—first magnet, 82—second magnet, D1—first direction, D2—second direction, J1—motor shaft, J2—output shaft.

DETAILED DESCRIPTION

Hereinafter, the electric actuator of the embodiment of the utility model will be described with reference to the accompanying drawings. In addition, the scope of the utility model is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the utility model. In addition, in the following drawings, in order to facilitate the understanding of each structure, the scale, quantity, etc. in each structure are sometimes different from the actual structure.

In each of the accompanying drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the X-axis direction is the left-right direction with the positive side (+X side) as the right side and the negative side (-X side) as the left side. The Y-axis direction is the front-to-back direction with the positive side (+Y side) as the rear side and the negative side (-Y side) as the front side, which is orthogonal to the X-axis direction. The Z-axis direction is the up-down direction with the positive side (+Z side) as the upper side and the negative side (-Z side) as the lower side, which is orthogonal to both the X-axis direction and the Y-axis direction. In addition, the left side, right side, front side, rear side, upper side and lower side are only names used to illustrate the relative positional relationship of each part, and the actual configuration relationship, etc. may also be a configuration relationship other than the configuration relationship shown by these names, etc.

The direction in which the motor shaft J1 shown in each figure extends is parallel to the X-axis direction, that is, the left-right direction. The motor shaft J1 is a virtual axis. In the following description, the direction parallel to the motor shaft J1 is referred to as the "motor shaft direction". In addition, the radial direction centered on the motor shaft J1 is referred to as the "radial direction". The circumferential direction centered on the motor shaft J1 is referred to as the "circumferential direction". In this embodiment, the right side (+X side) is equivalent to one side of the motor shaft direction, and the left side (-X side) is equivalent to the other side of the motor shaft direction. The circumferential direction is shown by the arrow θ1 in each figure.

In each figure, the first direction D1 indicated by the arrow D1 is the direction in which the plate surface of the substrate 70 described later is facing. The first direction D1 is a direction orthogonal to the motor axis J1. In the present embodiment, the first direction D1 is parallel to the up-down direction (Z-axis direction). In the following description, the side (+D1 side) to which the arrow of the first direction D1 is pointing is referred to as "one side of the first direction D1" or "upper side", and the side opposite to the side to which the arrow of the first direction D1 is pointing (-D1 side) is referred to as "the other side of the first direction D1" or "lower side". In addition, the first direction D1 may not be parallel to the up-down direction, but may intersect with the up-down direction.

In each figure, the second direction D2 indicated by the arrow D2 is a direction orthogonal to both the motor shaft direction and the first direction D1. In the present embodiment, the second direction D2 is parallel to the front-to-back direction (Y-axis direction). In the following description, the side (+D2 side) to which the arrow of the second direction D2 points is referred to as "one side of the second direction D2" or "rear side", and the side opposite to the side to which the arrow of the second direction D2 points (-D2 side) is referred to as "the other side of the second direction D2" or "front side". In addition, the second direction D2 may not be parallel to the front-to-back direction, for example, it may intersect with the front-to-back direction.

The electric actuator 1 of the present embodiment shown in FIG1 is an electric actuator mounted on a vehicle. More specifically, it is mounted on an actuator device of a drive-by-wire parking method driven based on a shift operation of a driver of the vehicle. The electric actuator 1 includes a housing 10, a motor unit 20, a transmission mechanism 30, an output shaft 38, a cover member 60, a substrate 70, a first magnet 81, a second magnet 82, a first magnetic sensor 76, and a second magnetic sensor 77.

The housing 10 accommodates the motor unit 20, the transmission mechanism 30, the output shaft 38, the cover member 60, the substrate 70, the first magnet 81, the second magnet 82, the first magnetic sensor 76, and the second magnetic sensor 77. The housing 10 is cylindrical and surrounds the motor shaft J1. The housing 10 has a storage member 11, an upper cover member 18, and a side cover member 19.

The storage member 11 is box-shaped and extends in the motor shaft direction. The storage member 11 has a first opening 11a opened upward (+Z side). The first opening 11a is closed by an upper cover member 18 fixed to the upper end of the storage member 11. The storage member 11 has a side wall 12 and a bottom wall 17.

As shown in FIG2 , the side wall portion 12 surrounds the motor portion 20, the transmission mechanism 30, the output shaft 38, the substrate 70 and other parts of the electric actuator 1 from the radial outside. When viewed from the top and bottom direction (Z-axis direction), the side wall portion 12 is a substantially rectangular shape with the long side extending in the motor shaft direction. The side wall portion 12 includes a first side wall portion 13, a second side wall portion 14, a third side wall portion 15 and a fourth side wall portion 16.

The first side wall portion 13 is a portion of the side wall portion 12 on the other side (-X side) in the direction of the motor shaft. The first side wall portion 13 is in the shape of a plate extending in a direction orthogonal to the axial direction. When viewed from the direction of the motor shaft, the first side wall portion 13 is in a generally rectangular shape with the long sides extending in the front-to-back direction (Y-axis direction). When viewed from the direction of the motor shaft, the motor shaft J1 overlaps with a portion that is closer to the front side (-Y side) than the center of the first side wall portion 13 in the front-to-back direction. The first side wall portion 13 is provided with a first through hole 13a and a side wall bearing retaining portion 13b.

As shown in FIG1 , the first through hole 13a is a hole that penetrates the first side wall portion 13 in the direction of the motor shaft. When viewed from the motor shaft direction, the first through hole 13a is a generally circular shape centered on the motor shaft J1. The side wall bearing retaining portion 13b protrudes from the first side wall portion 13 to one side (+X side) in the direction of the motor shaft. As shown in FIG2 , the side wall bearing retaining portion 13b is a generally semi-cylindrical shape centered on the motor shaft J1. When viewed from the motor shaft direction, the side wall bearing retaining portion 13b is located above the motor shaft J1 (+Z side).

The second side wall portion 14 is a portion on the front side (-Y side) of the side wall portion 12. The second side wall portion 14 is a plate-shaped portion extending from the front end of the first side wall portion 13 toward one side in the motor shaft direction. When viewed from the front-to-back direction (Y-axis direction), the second side wall portion 14 is a substantially rectangular shape with the long sides extending in the axial direction.

The third side wall portion 15 is a portion on the rear side (+Y side) of the side wall portion 12. The third side wall portion 15 is a plate-shaped portion extending from the rear end of the first side wall portion 13 toward one side in the motor shaft direction. When viewed from the front-to-back direction, the third side wall portion 15 is a substantially rectangular shape with the long side extending in the axial direction. The third side wall portion 15 is provided with a connector mounting portion 15a.

The connector mounting portion 15a is a generally square tube-shaped portion that protrudes from a portion of the third side wall portion 15 on one side in the motor shaft direction to the rear side (+Y side). The connector mounting portion 15a is open at the rear side and the front side (-Y side). The interior of the connector mounting portion 15a is connected to the interior of the housing 10 via a hole portion (not shown) that penetrates the third side wall portion 15 in the front-to-back direction (Y-axis direction). The connector mounting portion 15a holds a plurality of connector pins 78.

The fourth side wall portion 16 is a portion of the side wall portion 12 on one side in the motor shaft direction (+X side). The fourth side wall portion 16 is a plate-shaped portion extending in a direction orthogonal to the motor shaft direction. When viewed from the motor shaft direction, the fourth side wall portion 16 is a generally rectangular shape with a long side extending in the front-to-back direction (Y-axis direction). When viewed from the motor shaft direction, the motor axis J1 overlaps with a portion that is closer to the front side (-Y side) than the center of the fourth side wall portion 16 in the front-to-back direction. The end of the front side of the fourth side wall portion 16 is connected to the end of the second side wall portion 14 on one side in the motor shaft direction. The end of the rear side (+Y side) of the fourth side wall portion 16 is connected to the end of the third side wall portion 15 on one side in the motor shaft direction. As shown in FIG. 1 , a second through hole 16a is provided in the fourth side wall portion 16. The second through hole 16a is a hole that penetrates the fourth side wall portion 16 in the motor shaft direction. When viewed from the motor shaft direction, the second through hole 16a is a generally circular shape centered on the motor axis J1. A first bearing 93 is held on the inner peripheral surface of the second through hole 16 a.

The bottom wall portion 17 is arranged on the lower side (-Z side) of the motor portion 20 and the transmission mechanism 30. When viewed from the up-down direction (Z-axis direction), the bottom wall portion 17 is a generally rectangular shape with the long side extending in the left-right direction (X-axis direction). The outer edge of the bottom wall portion 17 is connected to the lower end of the side wall portion 12 in the up-down direction. As shown in FIG. 3 , the bottom wall portion 17 has a motor storage portion 17a and a shaft storage portion 17b. The bottom wall portion 17 is provided with a plurality of substrate fixing portions 17e, a first cover fixing portion 17f, a second cover fixing portion 17g and a bottom wall hole portion 17h.

The motor housing portion 17a is semi-cylindrical and extends in the motor shaft direction with the motor shaft J1 as the center. When viewed from the motor shaft direction, the motor housing portion 17a is arranged at a position lower than the motor shaft J1. As shown in FIG. 1, the motor housing portion 17a is arranged on one side (+X side) of the motor shaft direction of the bottom wall portion 17. The lower side of the motor unit 20 is accommodated inside the motor housing portion 17a.

As shown in FIG3 , the shaft housing portion 17b is roughly semi-cylindrical and extends along the motor shaft direction with the motor shaft J1 as the center. When viewed from the motor shaft direction, the shaft housing portion 17b is arranged at a position lower than the motor shaft J1. As shown in FIG1 , the shaft housing portion 17b is arranged on the portion of the bottom wall portion 17 on the other side (-X side) in the motor shaft direction. The inner diameter of the shaft housing portion 17b is smaller than the inner diameter of the motor housing portion 17a. The portion of the motor shaft 24 on the other side in the motor shaft direction described later is housed inside the shaft housing portion 17b. The portion of the inner circumferential surface of the shaft housing portion 17b on the other side in the motor shaft direction is connected to the inner circumferential surface of the side wall bearing retaining portion 13b. The second bearing 94 is retained on the portion of the inner circumferential surface of the shaft housing portion 17b on the other side in the motor shaft direction and the inner circumferential surface of the side wall bearing retaining portion 13b.

As shown in FIG2 , a plurality of substrate fixing portions 17e are roughly cylindrical and protrude from the bottom wall portion 17 to the upper side (+Z side). In the present embodiment, seven substrate fixing portions 17e are provided on the bottom wall portion 17. An internal threaded hole recessed to the lower side (-Z side) is provided on the surface of each substrate fixing portion 17e facing the upper side. As shown in FIG3 , the first cover fixing portion 17f is a plate-shaped portion protruding to the upper side from the other side (-X side) and the rear side (+Y side) of the bottom wall portion 17 in the direction of the motor shaft. As shown in FIG4 , the first cover fixing portion 17f extends from the other side of the direction of the motor shaft of the transmission mechanism 30 toward the rear side of the transmission mechanism 30, and then extends to the one side (+X side) of the direction of the motor shaft of the transmission mechanism 30. As shown in FIG3 , in the up-down direction (Z-axis direction), the upper end of the first cover fixing portion 17f is located at a position lower than the upper end of the substrate fixing portion 17e.

The second cover fixing portion 17g is a plate-shaped portion that protrudes upward from the edge portion of the front side (-Y side) of the shaft housing portion 17b. As shown in FIG. 4 , the second cover fixing portion 17g extends in the direction of the motor shaft. The plate surface of the second cover fixing portion 17g faces the front-back direction. As shown in FIG. 3 , in the up-down direction, the position of the upper end of the second cover fixing portion 17g is substantially the same as the position of the upper end of the first cover fixing portion 17f.

The bottom wall hole 17h is a hole that passes through the other side (-X side) and rear side (+Y side) of the bottom wall 17 in the output shaft direction. The bottom wall hole 17h is circular with the output shaft J2 as the center when viewed from the output shaft direction.

In addition, in the present embodiment, the output shaft J2 shown in each figure is an imaginary axis extending in a direction intersecting the motor shaft direction. In the present embodiment, the output shaft J2 extends in a direction orthogonal to the motor shaft direction and parallel to the Z axis. In the present embodiment, the direction parallel to the output shaft J2 is referred to as the "output shaft direction", the radial direction centered on the output shaft J2 is referred to as the "output radial direction", and the circumferential direction centered on the output shaft J2 is referred to as the "output circumferential direction". The output circumferential direction is indicated by an arrow θ2 in each figure.

As shown in FIGS. 1 and 3 , the upper cover member 18 is fixed to the upper end of the storage member 11. The upper cover member 18 blocks the first opening 11a of the storage member 11 from the upper side (+Z side). The upper cover member 18 is in the shape of a plate extending in a direction perpendicular to the up-down direction (Z-axis direction). Although not shown in the figure, when viewed from the up-down direction, the upper cover member 18 is in the shape of a roughly rectangular shape with the long sides extending in the left-right direction (X-axis direction). An upper cover motor storage portion 18a is provided on the upper cover member 18.

As shown in FIG3 , the upper cover motor storage portion 18a is a portion of the upper cover member 18 that protrudes upward. When viewed from the motor axis direction, the upper cover motor storage portion 18a is in the shape of an arc centered on the motor axis J1. As shown in FIG1 , the upper cover motor storage portion 18a is provided on one side (+X side) of the upper cover member 18 in the motor axis direction. Although not shown in the figure, the upper cover motor storage portion 18a overlaps with the motor storage portion 17a when viewed from the top and bottom directions. The upper side portion of the motor unit 20 is stored inside the upper cover motor storage portion 18a.

The side cover member 19 is substantially disk-shaped with the motor axis J1 as the center. The plate surface of the side cover member 19 faces the motor axis direction. The side cover member 19 is fixed to the second through hole 16a. The side cover member 19 closes the second through hole 16a from one side (+X side) in the motor axis direction.

The motor unit 20 includes a motor case 40, a rotor 22, and a stator 23. The motor case 40 accommodates the upper side (+Z side) portion of the rotor 22 and the upper side portion of the stator 23. As shown in FIG. 2 , the motor case 40 includes a motor case body 41 and a fixing portion 42.

As shown in FIG1 , the motor housing body 41 is a roughly semi-cylindrical shape extending along the motor axis direction with the motor axis J1 as the center, and the motor housing body 41 is open on the other side (-X side) and one side (+X side) of the motor axis direction. The motor housing body 41 surrounds the upper part of the rotor 22 and the upper part of the stator 23 from the radial outside. The upper part of the motor housing body 41 is located inside the upper cover motor storage portion 18a.

As shown in FIG2 , the fixing portion 42 protrudes from the motor housing body 41 in the front-rear direction (Y-axis direction). In the present embodiment, the motor housing 40 has five fixing portions 42. Two fixing portions 42 protrude to the rear from the end portion of the rear side (+Y side) of the motor housing body 41. The two fixing portions 42 are spaced apart in the left-right direction (X-axis direction). Three fixing portions 42 protrude to the front from the end portion of the front side (-Y side) of the motor housing body 41. The three fixing portions 42 are spaced apart in the left-right direction. The surface of each fixing portion 42 facing the lower side (-Z side) contacts the surface of the bottom wall portion 17 facing the upper side (+Z side) in the up-down direction. Each fixing portion 42 is provided with a hole (not shown) that passes through each fixing portion 42 in the up-down direction (Z-axis direction). The screws 99 pass through the holes of the fixing parts 42 in the vertical direction, and when the screws 99 are screwed into the internal threaded holes (not shown) provided in the bottom wall 17, the fixing parts 42 are fixed to the housing member 11. Thus, the motor housing 40 is fixed to the housing member 11.

The rotor 22 is rotatable around the motor shaft J1. As shown in FIG1 , the rotor 22 includes a rotor core 22a, a plurality of motor magnets 22b, and a motor shaft 24. The rotor core 22a is substantially annular centered around the motor shaft J1. The plurality of motor magnets 22b are respectively fixed to the outer peripheral surface of the rotor core 22a. The plurality of motor magnets 22b are arranged along the outer peripheral surface of the rotor core 22a.

The motor shaft 24 is roughly cylindrical and extends along the motor shaft direction with the motor shaft J1 as the center. The rotor core 22a is fixed to the portion on one side (+X side) of the outer peripheral surface of the motor shaft 24 in the motor shaft direction. The lower side (-Z side) of the portion on the other side (-X side) in the motor shaft direction of the motor shaft 24 is located inside the shaft storage portion 17b. The end of the motor shaft 24 on one side in the motor shaft direction is supported by the first bearing 93 in a rotatable manner, and the end of the motor shaft 24 on the other side in the motor shaft direction is supported by the second bearing 94 in a rotatable manner. Thus, the motor shaft 24 can rotate around the motor shaft J1. In the present embodiment, the first bearing 93 and the second bearing 94 are ball bearings respectively. The first bearing 93 and the second bearing 94 may be rolling bearings other than ball bearings, or may be sliding bearings.

As shown in Fig. 1, the stator 23 is arranged radially outside the rotor 22. The stator 23 is arranged to face the rotor 22 with a gap in the radial direction. The stator 23 has a stator core 23a, an insulator 23e attached to the stator core 23a, and a plurality of coils 23f attached to the stator core 23a via the insulator 23e.

The stator core 23a is roughly annular with the motor shaft J1 as the center. The lower side (-Z side) portion of the outer peripheral surface of the stator core 23a is fixed to the inner side surface of the motor storage portion 17a. The upper side (+Z side) portion of the outer peripheral surface of the stator core 23a is fixed to the inner side surface of the motor housing body 41. As described above, the motor housing 40 is fixed to the storage component 11. Thus, the stator core 23a is fixed to the housing 10. Each of the multiple coils 23f is electrically connected to the substrate 70. Current is supplied from the substrate 70 to each of the multiple coils 23f.

As shown in FIG. 2 , the cover member 60 is in the shape of a plate extending in a direction perpendicular to the up-down direction (Z-axis direction). As shown in FIG. 3 , the cover member 60 is fixed to the first cover fixing portion 17f and the second cover fixing portion 17g, respectively. Thus, the cover member 60 is fixed to the housing 10. As shown in FIG. 1 and FIG. 3 , in the up-down direction, the cover member 60 is arranged at a position lower than the substrate 70 and higher than the motor shaft 24 and the transmission mechanism 30. As shown in FIG. 2 , the cover member 60 is arranged at a position closer to the other side (-X side) in the motor shaft direction than the motor housing 40. When viewed from the up-down direction, the cover member 60 overlaps with the transmission mechanism 30 and the motor shaft 24 on the other side in the motor shaft direction. The cover member 60 is provided with a cutout portion 60a, a cover hole portion 60b and a through hole 60d.

The cutout portion 60a is a cutout extending from the end of the cover member 60 on one side (+X side) in the motor shaft direction to the other side (-X side) in the motor shaft direction. When viewed from the top and bottom direction (Z-axis direction), the cutout portion 60a is substantially rectangular. As shown in FIG. 1 , when viewed from the top and bottom direction, the cutout portion 60a overlaps with the first magnet 81. The first magnet 81 is exposed to a position above the cover member 60 through the cutout portion 60a.

As shown in FIG. 2 , the cover hole portion 60b is a hole that passes through the cover member 60 in the vertical direction. When viewed from the vertical direction, the cover hole portion 60b is a circle centered on the output shaft J2. The output shaft 38 passes through the cover hole portion 60b in the vertical direction. The insertion hole 60d is a hole that passes through the cover member 60 in the vertical direction. In the present embodiment, three insertion holes 60d are provided in the cover member 60. The substrate fixing portion 17e passes through each of the insertion holes 60d in the vertical direction.

As shown in FIG1 , the transmission mechanism 30 is arranged on the other side (-X side) of the motor shaft direction of the motor unit 20. The transmission mechanism 30 is connected to the motor shaft 24 and the output shaft 38. The transmission mechanism 30 transmits the rotation of the motor shaft 24 to the output shaft 38. As shown in FIG4 , the transmission mechanism 30 has a drive input gear unit 25 and an output gear 31.

The drive input gear portion 25 is disposed on the outer peripheral surface of the motor shaft 24. More specifically, the drive input gear portion 25 is disposed on the outer peripheral surface of the portion on the other side (-X side) of the motor shaft direction of the motor shaft 24. The drive input gear portion 25 is rotatable around the motor shaft J1. In the present embodiment, the drive input gear portion 25 is a worm gear extending helically along the motor shaft direction.

The output gear 31 transmits the rotation of the motor shaft 24 to the output shaft 38. The output gear 31 can rotate around the output shaft J2. The output gear 31 has an output gear body 31a and an output gear body 31b. The output gear body 31a is a plate-like shape that is roughly fan-shaped and centered on the output shaft J2. The plate surface of the output gear body 31a faces the up-down direction (Z-axis direction). As shown in FIG. 3 , the surface of the output gear 31 facing the upper side (+Z side) contacts the surface of the cover part 60 facing the lower side (-Z side) in the up-down direction. The surface of the output gear 31 facing the lower side contacts the surface of the bottom wall 17 facing the upper side in the up-down direction. Thus, the position of the output gear 31 in the up-down direction is determined.

As shown in Figure 4, the output gear portion 31b is arranged on the outer peripheral surface of the output gear body portion 31a. In more detail, the output gear portion 31b is arranged on the outer peripheral surface of the front end portion of the portion of the output gear body portion 31a that protrudes toward the drive input gear portion 25. The output gear portion 31b is arranged in a portion of the arc of the output gear body portion 31a that is roughly fan-shaped in the outer peripheral surface of the output gear body portion 31a. The output gear portion 31b extends along a circular arc centered on the output shaft J2. The output gear portion 31b has a plurality of output tooth portions 31c arranged along the output circumferential direction. The output gear portion 31b and the drive input gear portion 25 mesh with each other. As a result, the rotation of the motor shaft 24 is transmitted to the output gear 31. In the present embodiment, the rotation of the motor shaft 24 is decelerated and transmitted by the output gear 31.

The rotation of the motor shaft 24 is transmitted to the output shaft 38 via the transmission mechanism 30. As shown in FIG. 3 , the output shaft 38 is a substantially cylindrical shape extending in the output shaft direction with the output shaft J2 as the center. The output shaft 38 passes through the inside of the output gear body 31a in the motor shaft direction. In the present embodiment, the outer peripheral surface of the output shaft 38 is connected to the output gear body 31a. Thus, the output shaft 38 is connected to the output gear 31. In the present embodiment, the output shaft 38 and the output gear 31 are part of the same single component. In addition, the output shaft 38 and the output gear 31 may also be different components. In this case, for example, when the output shaft 38 passes through the hole that penetrates the output gear body 31a in the output shaft direction and the outer peripheral surface of the output shaft 38 is fixed to the inner peripheral surface of the hole, the output shaft 38 is connected to the output gear 31. As described above, in the present embodiment, since the rotation of the motor shaft 24 is decelerated and transmitted by the output gear 31, the rotation of the motor shaft 24 is decelerated and transmitted to the output shaft 38.

The upper side (+Z side) portion of the output shaft 38 passes through the cover hole portion 60b of the cover member 60 along the output shaft direction. In the output shaft direction, the upper end portion of the output shaft 38 is located between the cover member 60 and the substrate 70. The portion of the outer peripheral surface of the output shaft 38 that is above the output gear 31 is supported on the inner peripheral surface of the cover hole portion 60b. The portion of the outer peripheral surface of the output shaft 38 that is below the output gear 31 (-Z side) is supported on the inner peripheral surface of the bottom wall hole portion 17h of the bottom wall portion 17. Thus, the output shaft 38 can rotate around the output shaft J2. A connecting recess 38d is provided on the output shaft 38.

The connecting recess 38d is recessed from the surface of the output shaft 38 facing the lower side (-Z side) toward the upper side (+Z side). The connecting recess 38d is exposed to the outside of the housing 10. Although omitted from the illustration, the connecting recess 38d is in the shape of a long hole when viewed from the output shaft direction. If a driven component not shown is inserted into the interior of the connecting recess 38d, the output shaft 38 is connected to the driven component. In the embodiment, the driven component is a manual shaft of the vehicle. The electric actuator 1 drives the manual shaft based on the driver's shift operation to switch the gear position of the vehicle.

According to the present embodiment, the transmission mechanism 30 includes: a drive input gear portion 25 provided on the outer peripheral surface of the motor shaft 24; and an output gear 31 provided with an output gear portion 31b and rotatable around the output shaft J2, the drive input gear portion 25 and the output gear portion 31b being meshed with each other, and the output gear 31 being connected to the output shaft 38. Therefore, by the transmission mechanism 30 consisting only of the drive input gear portion 25 and the output gear 31, the rotation of the motor shaft 24 can be transmitted to the output shaft 38 rotating around the output shaft J2, and the output shaft J2 extends in a direction intersecting the motor shaft J1, which is the rotation axis of the motor shaft 24. Therefore, the size of the transmission mechanism 30 can be suppressed, and the increase in the number of components of the transmission mechanism 30 can be suppressed. Therefore, the size of the electric actuator 1 can be suppressed, and the increase in the manufacturing cost of the electric actuator 1 can be suppressed.

According to the present embodiment, the transmission mechanism 30 is a speed reduction mechanism that reduces the rotation of the motor shaft 24 and transmits it to the output shaft 38. Therefore, the rotation torque of the output shaft 38 can be increased relative to the rotation torque of the motor shaft 24, so that the driven component, that is, the manual shaft of the vehicle, can be driven smoothly.

As shown in FIG1 , the first magnet 81 is annular with the motor shaft J1 as the center. The first magnet 81 surrounds a portion of the motor shaft 24 that is closer to the other side of the motor shaft direction (-X side) than the rotor core 22a and closer to one side of the motor shaft direction (+X side) than the drive input gear portion 25. The first magnet 81 is fixed to the outer peripheral surface of the motor shaft 24. Thus, the first magnet 81 can rotate with the rotor 22 around the motor shaft J1. As shown in FIG2 , the first magnet 81 is exposed to the upper side (+Z side) of the cover part 60 through the cutout portion 60a of the cover part 60. Different magnetic poles are arranged adjacent to each other in the circumferential direction on the first magnet 81. In the present embodiment, a pair of different magnetic poles are arranged on the first magnet 81. The first magnet 81 may be provided with two or more pairs of different magnetic poles.

In the present embodiment, the second magnet 82 is roughly disk-shaped with the output shaft J2 as the center. The second magnet 82 may also be other shapes such as an annular plate-shaped shape with the output shaft J2 as the center. The plate surface of the second magnet 82 faces the up-down direction (Z-axis direction). The second magnet 82 is fixed on the surface of the output shaft 38 facing the upper side (+Z side). That is, the second magnet 82 is fixed to the end of the output shaft 38 in the output shaft direction. Thus, the second magnet 82 can rotate with the output shaft 38 around the output shaft J2. Different magnetic poles are adjacently arranged on the second magnet 82 along the output circumference. In the present embodiment, a pair of different magnetic poles are provided on the second magnet 82. The second magnet 82 may be provided with two or more pairs of different magnetic poles.

As shown in FIG. 1 , the filter component 90 is installed in the first through hole 13a of the housing 10. The filter component 90 is a filter that allows ventilation between the inside of the housing 10 and the outside of the housing 10. The air pressure inside the housing 10 can be stabilized by the filter component 90. In the present embodiment, the filter component 90 is, for example, a ventilator. An O-ring 91 is arranged between the filter component 90 and the inner circumferential surface of the first through hole 13a. The O-ring 91 contacts the filter component 90 and the inner circumferential surface of the first through hole 13a, and seals the filter component 90 and the housing 10.

The substrate 70 controls the DC current supplied to the coil 23f. As shown in FIG. 2, in the present embodiment, the substrate 70 is a roughly L-shaped plate. The plate surface of the substrate 70 faces the first direction D1 that is orthogonal to the motor shaft J1. In the present embodiment, the plate surface of the substrate 70 faces the up-down direction (Z-axis direction). As shown in FIG. 1, the substrate 70 is arranged at a position higher than the cover member 60 and the transmission mechanism 30. The substrate 70 is arranged at a position higher than the first magnet 81 and the second magnet 82, that is, on one side of the first direction D1. Although not shown in the figure, the substrate 70 is electrically connected to the coil 23f. As shown in FIG. 2, a substrate hole portion 70f is provided on the substrate 70. The substrate 70 has a first substrate portion 70b and a second substrate portion 70c.

The substrate hole portion 70f is a hole that penetrates the substrate 70 in the up-down direction (Z-axis direction). In the present embodiment, seven substrate hole portions 70f are provided on the substrate 70. When viewed from the up-down direction, each substrate hole portion 70f overlaps with the substrate fixing portion 17e. When the screw 98 passes through each substrate hole portion 70f in the up-down direction and is screwed into the unillustrated internal threaded hole of each substrate fixing portion 17e, the substrate 70 is fixed to each substrate fixing portion 17e. Thus, the substrate 70 is fixed to the housing 10.

The first substrate portion 70b is a portion of the substrate 70 on the other side (-X side) in the motor shaft direction. When viewed from the top and bottom direction, the first substrate portion 70b is a substantially rectangular shape with the long side extending in the front-back direction (Y-axis direction). The first substrate portion 70b is arranged at a position closer to the other side in the motor shaft direction than the motor housing 40. The first substrate portion 70b is arranged on the upper side (+Z side) of the first magnet 81 and the second magnet 82. The first substrate portion 70b is opposed to the first magnet 81 and the second magnet 82 in the top and bottom directions, respectively. As shown in FIG. 3 , when viewed from the motor shaft direction, a portion of the front side (-Y side) of the first substrate portion 70b overlaps with the motor unit 20. That is, according to the present embodiment, when viewed from the motor shaft direction, at least a portion of the first substrate portion 70b overlaps with the motor unit 20. Therefore, compared with the case where the first substrate portion 70b is arranged at a position closer to the outside in the radial direction than the motor unit 20, the first substrate portion 70b can be arranged closer to the motor shaft J1. Therefore, it is possible to suppress the electric actuator 1 from being enlarged in the radial direction.

As shown in FIG. 2 , the second substrate portion 70c is a portion of the substrate 70 on one side (+X side) in the motor axis direction. When viewed from the top and bottom direction (Z axis direction), the second substrate portion 70c is a substantially rectangular shape with the long side extending in the motor axis direction. The second substrate portion 70c extends from a portion of the first substrate portion 70b on one side in the second direction D2 to one side in the motor axis direction. The second substrate portion 70c is located at a position further back (+Y side) than the motor housing 40. According to the present embodiment, when viewed from the second direction D2, a portion of the second substrate portion 70c overlaps with the motor portion 20. Therefore, compared with the case where the second substrate portion 70c is arranged at a position further up than the motor portion 20, that is, at one side (+D1 side) in the first direction D1, or further down than the motor portion 20, that is, at the other side (-D1 side) in the first direction D1, the electric actuator 1 can be prevented from being enlarged in the first direction D1.

A drive circuit unit 70d is provided on the second substrate unit 70c. The drive circuit unit 70d has a plurality of electronic components not shown in the figure, such as a plurality of insulated gate bipolar transistors (IGBTs). The drive circuit unit 70d is electrically connected to an external power source not shown in the figure via a connector pin 78. The drive circuit unit 70d generates a current supplied to the coil 23f by a current supplied from the external power source. Although the illustration is omitted, the drive circuit unit 70d is electrically connected to the coil 23f and supplies the generated current to the coil 23f. Thus, the drive circuit unit 70d drives the motor unit 20. In the present embodiment, the drive circuit unit 70d is arranged between the connector mounting portion 15a and the motor unit 20 in the front-to-back direction (Y-axis direction). Therefore, it is easy to shorten the distance between the connector pin 78 connected to the external power source and the drive circuit unit 70d, and the distance between the drive circuit unit 70d and the motor unit 20. Therefore, it is easy to simplify the structure of the cable, etc., which electrically connects the connector pin 78 and the coil 23f, and the circuit pattern of the substrate 70. Therefore, it is possible to suppress an increase in the manufacturing cost and the number of manufacturing man-hours of the electric actuator 1 .

The first magnetic sensor 76 and the second magnetic sensor 77 are respectively mounted on the substrate 70. In more detail, the first magnetic sensor 76 and the second magnetic sensor 77 are respectively mounted on the surface of the first substrate portion 70b facing the lower side (-Z side). As shown in FIG. 1, the first magnetic sensor 76 is opposite to the first magnet 81 in the up-down direction (Z-axis direction) across the cutout portion 60a of the cover member 60. In more detail, the first magnetic sensor 76 is opposite to the outer peripheral surface of the first magnet 81 in the up-down direction. The first magnetic sensor 76 is a magnetic sensor capable of detecting the magnetic field of the first magnet 81. As described above, since mutually different magnetic poles are adjacently arranged in the circumferential direction on the first magnet 81, when the first magnet 81 rotates around the motor shaft J1 together with the motor shaft 24, the first magnetic sensor 76 can detect changes in the magnetic field of the first magnet 81. Thus, the first magnetic sensor 76 can detect the circumferential position of the first magnet 81, and thus can detect the rotation of the motor shaft 24.

The second magnetic sensor 77 is opposite to the second magnet 82 in the up-down direction (Z-axis direction). In more detail, the second magnetic sensor 77 is opposite to the surface of the second magnet 82 facing the upper side (+Z side) in the up-down direction. The second magnetic sensor 77 is a magnetic sensor capable of detecting the magnetic field of the second magnet 82. As described above, since different magnetic poles are adjacently arranged on the second magnet 82 along the output circumference, when the second magnet 82 rotates around the output shaft J2 together with the output shaft 38, the second magnetic sensor 77 can detect the change in the magnetic field of the second magnet 82. Thus, the second magnetic sensor 77 can detect the position of the second magnet 82 in the output circumferential direction, and thus can detect the rotation of the output shaft 38. In the present embodiment, the first magnetic sensor 76 and the second magnetic sensor 77 can be, for example, a magnetic sensor having a Hall element such as a Hall IC, or a magnetic sensor having an MR (Magnetic Resistance) sensor element.

According to the present embodiment, the substrate 70 is arranged on the upper side of the first magnet 81 and the second magnet 82, that is, on one side (+D1 side) of the first direction D1, and the first magnetic sensor 76 and the second magnetic sensor 77 are mounted on the substrate 70, the first magnetic sensor 76 faces the outer peripheral surface of the first magnet 81, and the second magnetic sensor 77 faces the second magnet 82. Therefore, since both the first magnetic sensor 76 and the second magnetic sensor 77 are mounted on the substrate 70, it is not necessary to provide components such as leads and bus bars for connecting the substrate 70 and the sensor substrate, compared with the case where at least one of the first magnetic sensor 76 and the second magnetic sensor 77 is mounted on a sensor substrate different from the substrate 70. Therefore, it is possible to suppress an increase in the number of components of the electric actuator 1. Therefore, it is possible to suppress an increase in the manufacturing cost of the electric actuator 1. In addition, in the manufacturing process of the electric actuator 1, since it is not necessary to connect components such as leads and bus bars to the substrate 70 and the sensor substrate by, for example, welding, etc., it is possible to suppress an increase in the manufacturing man-hours of the electric actuator 1.

In addition, in the present embodiment, the motor shaft 24 rotates around the motor shaft J1, and the output shaft 38 rotates around the output shaft J2 intersecting the motor shaft J1. Therefore, in a structure in which the first magnetic sensor 76 is arranged opposite to the first magnet 81 fixed to the end of the motor shaft direction of the motor shaft 24 in the motor shaft direction, and the second magnetic sensor 77 is arranged opposite to the second magnet 82 fixed to the end of the output shaft direction of the output shaft 38 in the output shaft direction, it is difficult to arrange the first magnetic sensor 76 and the second magnetic sensor 77 on the same substrate. In contrast, in the present embodiment, the first magnetic sensor 76 is arranged opposite to the radially oriented outer peripheral surface of the first magnet 81, and the second magnetic sensor 77 is arranged opposite to the surface of the second magnet 82 in the output shaft direction, so that each of the first magnetic sensor 76 and the second magnetic sensor 77 can be arranged opposite to each of the first magnet 81 and the second magnet 82 in the up-down direction, that is, in the first direction D1. Therefore, the first magnetic sensor 76 and the second magnetic sensor 77 can be easily mounted on the same substrate 70, and the rotation of the motor shaft 24 and the output shaft 38 can be detected by the first magnetic sensor 76 and the second magnetic sensor 77. Therefore, as described above, the increase in the manufacturing cost and the manufacturing man-hours of the electric actuator 1 can be suppressed.

In addition, in the present embodiment, the rotation of the motor shaft 24 can be detected by the first magnetic sensor 76, and the rotation of the output shaft 38 can be detected by the second magnetic sensor 77. Therefore, compared with a configuration in which only one of the rotation of the motor shaft 24 or the rotation of the output shaft 38 is detected, the rotation angle of the output shaft 38 can be more appropriately stabilized. Therefore, the accuracy of the rotation angle of the manual shaft of the vehicle, which is the driven component, can be more appropriately improved.

According to the present embodiment, the first magnet 81 is annular with the motor shaft J1 as the center, and mutually different magnetic poles are provided adjacent to each other in the circumferential direction, that is, the circumferential direction with the motor shaft J1 as the center, on the first magnet 81, and mutually different magnetic poles are provided adjacent to each other in the output circumferential direction, that is, the circumferential direction with the output shaft J2 as the center. Therefore, when the first magnet 81 rotates around the motor shaft J1 together with the motor shaft 24, the change of the magnetic field of the first magnet 81 can be detected by the first magnetic sensor 76, so that the rotation of the motor shaft 24 can be detected. In addition, when the second magnet 82 rotates around the output shaft J2 together with the output shaft 38, the change of the magnetic field of the second magnet 82 can be detected by the second magnetic sensor 77, so that the rotation of the output shaft 38 can be detected. Therefore, the rotation of the motor shaft 24 and the output shaft 38 can be appropriately detected by the first magnetic sensor 76 and the second magnetic sensor 77, so that the rotation angle of the output shaft 38 can be more appropriately stabilized.

According to the present embodiment, a drive circuit unit 70d for driving the motor unit 20 is provided on the substrate 70. Therefore, since the first magnetic sensor 76, the second magnetic sensor 77, and the drive circuit unit 70d are mounted on one substrate 70, compared with the case where at least one of the first magnetic sensor 76, the second magnetic sensor 77, and the drive circuit unit 70d is mounted on a substrate different from the substrate 70, components such as leads and bus bars for connecting the substrates to each other are not required. In addition, an increase in the number of substrates 70 can be suppressed. Therefore, an increase in the number of components of the electric actuator 1 can be suppressed. Therefore, an increase in the manufacturing cost of the electric actuator 1 can be suppressed. In addition, in the manufacturing process of the electric actuator 1, since there is no need to connect components such as leads and bus bars to the substrates to each other by, for example, welding, etc., an increase in the manufacturing man-hours of the electric actuator 1 can be suppressed.

The embodiments of the present invention are described above, but the various structures and their combinations in the embodiments are examples, and addition, omission, substitution and other changes of structures can be made without departing from the scope of the present invention. In addition, the present invention is not limited to the embodiments.

The structure of the transmission mechanism is not limited to the present embodiment. For example, the transmission mechanism may also include other components such as an intermediate gear that transmits the rotation of the driving input gear portion to the output gear. In the case where the intermediate gear is a stepped gear having a plurality of gear portions with different numbers of teeth, the degree of freedom in setting the range of the reduction ratio of the rotation of the output shaft relative to the rotation of the motor shaft can be increased.

The application of the electric actuator of the utility model is not particularly limited. The electric actuator can also be mounted on an actuator device of a wire-controlled shifting method driven based on the driver's shifting operation. In addition, the electric actuator can also be mounted on equipment other than vehicles. In addition, the various structures described in this specification can be appropriately combined within the scope of non-contradiction.

Note that the present technology may adopt the following structures. (1) An electric actuator comprising: a motor unit having a motor shaft rotatable about a motor shaft; an output shaft rotatable about an output shaft extending in a direction intersecting the motor shaft direction; a transmission mechanism connected to the motor shaft and the output shaft to transmit the rotation of the motor shaft to the output shaft; a substrate having a plate surface facing a first direction orthogonal to the motor shaft direction; a first magnet fixed to an outer peripheral surface of the motor shaft; a second magnet fixed to an end of the output shaft in the output shaft direction; a first magnetic sensor capable of detecting a magnetic field of the first magnet; and a second magnetic sensor capable of detecting a magnetic field of the second magnet, the substrate being arranged on a side closer to the first direction than the first magnet and the second magnet, the first magnetic sensor and the second magnetic sensor being mounted on the substrate, the first magnetic sensor being opposite to the outer peripheral surface of the first magnet, and the second magnetic sensor being opposite to the second magnet. (2) The electric actuator according to (1), wherein the first magnet is annular with the motor shaft as the center, and the first magnet has mutually different magnetic poles arranged adjacent to each other in the circumferential direction with the motor shaft as the center, and the second magnet has mutually different magnetic poles arranged adjacent to each other in the circumferential direction with the output shaft as the center. (3) The electric actuator according to (1) or (2), wherein the substrate has a first substrate portion on which the first magnetic sensor and the second magnetic sensor are mounted, and when viewed from the motor shaft direction, at least a portion of the first substrate portion overlaps with the motor portion. (4) The electric actuator according to (3), wherein the substrate has a second substrate portion extending from a portion of the first substrate portion on one side of a second direction orthogonal to both the motor shaft direction and the first direction to one side of the motor shaft direction, and when viewed from the second direction, at least a portion of the second substrate portion overlaps with the motor portion. (5) The electric actuator according to any one of (1) to (4), wherein a drive circuit portion for driving the motor portion is provided on the substrate. (6) An electric actuator according to any one of (1) to (5), wherein the transmission mechanism comprises: a drive input gear portion provided on the outer peripheral surface of the motor shaft; and an output gear provided with an output gear portion and rotatable about the output shaft, the drive input gear portion and the output gear portion being meshed with each other, and the output gear being connected to the output shaft. (7) An electric actuator according to any one of (1) to (6), wherein the transmission mechanism is a speed reduction mechanism that reduces the rotation of the motor shaft and transmits it to the output shaft.

Claims (7)

1. An electric actuator, characterized in that: have: a motor unit having a motor shaft rotatable about a motor shaft; An output shaft rotatable around an output shaft extending in a direction intersecting the motor shaft direction; a transmission mechanism connected to the motor shaft and the output shaft to transmit the rotation of the motor shaft to the output shaft; A substrate, wherein the surface of the substrate faces a first direction perpendicular to the motor shaft direction; A first magnet fixed to the outer peripheral surface of the motor shaft; a second magnet fixed to an end portion of the output shaft in the output shaft direction; a first magnetic sensor capable of detecting the magnetic field of the first magnet; and a second magnetic sensor capable of detecting the magnetic field of the second magnet, The substrate is arranged on the side closer to the first direction than the first magnet and the second magnet. The first magnetic sensor and the second magnetic sensor are mounted on the substrate, The first magnetic sensor faces the outer peripheral surface of the first magnet, and the second magnetic sensor faces the second magnet. 2. The electric actuator according to claim 1, characterized in that: The first magnet is in the shape of a ring centered on the motor shaft. On the first magnet, mutually different magnetic poles are adjacently arranged along a circumferential direction centered on the motor shaft. The second magnet has magnetic poles different from each other disposed adjacent to each other in a circumferential direction centered on the output shaft. 3. The electric actuator according to claim 1 or 2, characterized in that: The substrate includes a first substrate portion on which the first magnetic sensor and the second magnetic sensor are mounted, and at least a portion of the first substrate portion overlaps with the motor portion when viewed from the motor shaft direction. 4. The electric actuator according to claim 3, characterized in that: The substrate includes a second substrate portion extending from a portion of the first substrate portion on one side of a second direction perpendicular to both the motor shaft direction and the first direction to one side of the motor shaft direction. When viewed from the second direction, at least a portion of the second substrate portion overlaps the motor portion. 5. The electric actuator according to claim 1 or 2, characterized in that: A driving circuit unit for driving the motor unit is provided on the substrate. 6. The electric actuator according to claim 1 or 2, characterized in that: The transmission mechanism includes: a drive input gear portion provided on the outer peripheral surface of the motor shaft; and an output gear provided with an output gear portion and rotatable around the output shaft. The drive input gear portion and the output gear portion mesh with each other, The output gear is connected to the output shaft. 7. The electric actuator according to claim 6, characterized in that: The transmission mechanism is a speed reduction mechanism that reduces the speed of rotation of the motor shaft and transmits the reduced speed rotation to the output shaft.