JP2021025538A - Electric actuator - Google Patents

Abstract

To provide an electric actuator which enables swing members to be attached to an output shaft securely without using a fixing method achieved by welding and a connection pin.SOLUTION: A first motion conversion mechanism 4 has: a rotary member 7 rotationally driven by an electric motor; and a linear member 8 which linearly moves in a rotation axis direction in conjunction with rotation of the rotary shaft 7. A second motion conversion mechanism 5 has: an output shaft 14; and two swing members 11 which are respectively attached to both end part sides of the output shaft 14 and swing around the output shaft 14 in conjunction with the linear motion member 8. Each swing member 11 has a fitting part 11a which fits on an outer peripheral surface of the output shaft 14 so as to prevent the swing member 11 from rotating relative to the output shaft 14 and falling in a direction intersecting with its axial direction.SELECTED DRAWING: Figure 4

Description

The present invention relates to an electric actuator.

In recent years, electrification has progressed in order to save labor and reduce fuel consumption of vehicles, and for example, a system for operating an automatic transmission, a brake, a steering wheel, etc. of an automobile by the power of an electric motor has been developed and put on the market. .. As an electric actuator used for such an application, an electric actuator having a motion conversion mechanism for converting a rotary motion generated by driving an electric motor into a linear motion or the like is known.

For example, in Patent Document 1, as shown in FIG. 9, as a motion conversion mechanism, a linear motion conversion mechanism 100 that converts a rotational motion of an electric motor 300 into a linear motion (movement in the directions of arrows A1 and A2 in the figure) is described. An electric actuator including a swing member 200 that converts the linear motion into a rotational motion of the output shaft 400 (movement in the directions of arrows B1 and B2 in the figure) is disclosed. Specifically, the linear motion conversion mechanism 100 is composed of a sliding screw mechanism having a screw shaft 101 and a nut 102 screwed with the screw shaft 101. The swing member 200 has a bifurcated holding portion 200a, and a tubular output shaft 400 is held between the holding portions 200a. Further, the swing member 200 is provided with a long hole 200b, and the swing member 200 and the nut 102 are interlocked by inserting the pin-shaped connecting member 202 provided in the nut 102 into the long hole 200b. It is connected as possible.

When the screw shaft 101 rotates forward or reverse by driving the electric motor 300, the nut 102 moves in the direction of arrow A1 or the direction of arrow A2, so that the rotary motion is converted into a linear motion. Then, the swing member 200 swings in the direction of arrow B1 or the direction of arrow B2 as the nut 102 moves, so that the linear motion is converted into the rotary motion of the output shaft 400.

JP-A-2019-97382

By the way, in Patent Document 1, since the swing member 200 and the output shaft 400 are separately formed from each other, the swing member 200 does not fall off from the output shaft 400 in order to integrally assemble them. It is necessary to install it like this.

As a method of attaching the swing member 200 to the output shaft 400 so as not to fall off, for example, the bifurcated holding portion 200a of the swing member 11 is welded to the output shaft 400, or the holding portion 200a is attached with a connecting pin. There is a method of fixing to the output shaft 400. However, welding has a problem that it is difficult to secure quality assurance because the joint strength varies. Further, in the method of fixing with the connecting pin, there is a possibility that the connecting pin may come off due to an impact or vibration generated on the swing member 200 or the output shaft 400.

Therefore, an object of the present invention is to provide an electric actuator capable of reliably attaching a swing member to an output shaft without using a welding method or a fixing method using a connecting pin.

In the present invention, the electric motor, the first motion conversion mechanism that converts the rotational motion of the electric motor into linear motion, and the linear motion output from the first motion conversion mechanism in a direction different from the rotation axis of the electric motor. An electric actuator including a second motion conversion mechanism that converts the rotational motion of the shaft. The first motion conversion mechanism is a rotating member that is rotationally driven by an electric motor and its rotation as the rotating member rotates. It has a linear motion member that moves linearly in the axial direction, and the second motion conversion mechanism is attached to both ends of the output shaft and the output shaft, and swings around the output shaft in conjunction with the linear motion member. It has two moving swinging members, and the swinging member fits on the outer peripheral surface of the output shaft without rotating with respect to the output shaft and so as not to fall off in a direction intersecting the axial direction. It is characterized by having a part.

In this way, the swinging member has a fitting portion that fits on the outer peripheral surface of the output shaft so as not to fall off in the direction intersecting the axial direction of the output shaft, so that welding or connecting pins can be formed. The swing member can be attached so as not to fall off from the output shaft even if it is not used. As a result, it becomes easy to ensure the quality assurance of durability, and the possibility that the connecting pin comes off can be avoided, so that the reliability is improved.

Further, the electric actuator according to the present invention is provided with two swing members, so that these functions are integrated into one swing member (for example, the swing member 200 shown in FIG. 9). , The shape of the swing member can be simplified, and the manufacturing cost can be reduced. In addition, since the shape of the swing member is simplified, it becomes easier to assemble the parts and the work efficiency is improved. Further, since there are two swinging members, the load generated in one swinging member can be dispersed, and the durability of the swinging member can be improved.

A rotation regulation structure that regulates the rotation of the swing member with respect to the output shaft may be provided between the output shaft and the fitting portion. Such a rotation restricting structure includes, for example, a convex portion provided on one of the output shaft and the fitting portion, and a concave portion provided on the other of the output shaft and the fitting portion and engaging with the convex portion. Can be configured with.

Further, the rotation regulation structure may be a flat portion in which the output shaft and the fitting portion are engaged with each other.

A bearing in which the electric actuator according to the present invention rotatably supports an electric motor, a housing accommodating a first motion conversion mechanism and a second motion conversion mechanism, and an output shaft intervening between the housings. The bearing may be used as a retaining structure for preventing the swinging member from falling off in the axial direction with respect to the output shaft.

When the swinging member has an arm portion that extends from the fitting portion and swings in conjunction with the linear motion member, when the arm portion receives a force in the rotational direction from the linear motion member on the root side of the arm portion. By providing a reinforcing portion that suppresses the deformation of the arm portion, the strength of the arm portion is improved and the reliability is improved.

According to the present invention, the swing member can be reliably attached to the output shaft without using welding or a fixing method using connecting pins.

It is a side view which shows the internal structure of the electric actuator which concerns on one Embodiment of this invention. It is a front view of a planetary gear reduction mechanism. It is a perspective view which shows the state which the output shaft and the swing member are separated. It is a perspective view which shows the state which the output shaft and the swing member are assembled. It is sectional drawing which cut the electric actuator at the position of an output shaft and a swing member. It is a figure which shows another example of the rotation regulation structure. It is a figure which shows the example which provided the rib in the arm part. It is a figure which shows another example of the fitting part. It is a figure which shows the structure of the conventional electric actuator.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In each drawing for explaining the present invention, components such as members and components having the same function or shape will be described once by giving the same reference numerals as much as possible. Omit.

FIG. 1 is a side view showing an internal structure of an electric actuator according to an embodiment of the present invention.

As shown in FIG. 1, the electric actuator 1 according to the present embodiment linearly outputs the electric motor 2, the speed reducer 3 that decelerates and outputs the rotary motion of the electric motor 2, and the rotary motion output from the speed reducer 3. The first motion conversion mechanism 4 that converts the motion into motion, and the second motion that converts the linear motion output from the first motion conversion mechanism 4 into a rotational motion of an axis different from the rotation axis 2a of the electric motor 2. It mainly includes a conversion mechanism 5 and a housing 6 for accommodating them.

The housing 6 is configured by assembling two housing divisions 60 (see FIG. 5). FIG. 1 shows a state in which one of the two housing divisions 60 is removed. By assembling the housing divided bodies 60 to each other via a sealing member (not shown) between the mating surfaces, the internal space of the housing 6 is sealed, and foreign matter such as dust and water is prevented from entering the housing 6. Will be done. In particular, as in the present embodiment, by making the mating surface of the housing split 60 a flat surface parallel to the rotating shaft 2a of the electric motor 2 (without a step), the mating surfaces of the housing split 60 are aligned with each other at the time of assembly. Even if there is a slight deviation between the mating surfaces, a gap is unlikely to occur between the mating surfaces, and it is easy to ensure airtightness. As the sealing member, a solid sealing material such as an O-ring, a rubber sheet, a resin sheet, a joint sheet, or a metal gasket, or a liquid sealing member such as a liquid gasket can be adopted.

The first motion conversion mechanism 4 has a screw shaft 7 as a rotating member and a nut 8 as a linear motion member that linearly moves in the direction of the rotation axis as the screw shaft 7 rotates. Thread grooves are formed on the outer peripheral surface of the screw shaft 7 and the inner peripheral surface of the nut 8, respectively, and these screw shafts are directly screwed to form a sliding screw mechanism. As the first motion conversion mechanism 4, a ball screw mechanism in which a plurality of balls are interposed between the screw shaft (rotating member) and the nut (linear motion member) may be used. Both ends of the screw shaft 7 are rotatably supported with respect to the housing 6 via a radial bearing 9 and a thrust bearing 10, respectively. Further, each thrust bearing 10 and each end surface of the nut 8 facing the thrust bearing 10 are provided with protruding stopper portions 8a and 10a that regulate the movement of the nut 8 by abutting against each other.

The second motion conversion mechanism 5 includes a cylindrical output shaft 14 and a swing member 11 that holds the output shaft 14. The output shaft 14 is rotatably supported with respect to the housing 6. The swing member 11 is attached to the output shaft 14, and is configured to swing (rotatably) integrally with the output shaft 14 around the output shaft 14. Further, the output shaft 14 is provided with a connecting hole 14a in which a plurality of uneven portions (splines) are formed on the inner peripheral surface. The connecting hole 14a is a hole for inserting an operating shaft provided in an operation target (not shown), and the operating shaft is integrated with the output shaft 14 by being inserted into the connecting hole 14a and spline-fitting. It is rotatably connected. Further, the swing member 11 is provided with a long hole 11c. A columnar protrusion 12 protruding from the nut 8 is inserted into the elongated hole 11c. As a result, the nut 8 and the swinging member 11 are configured to be interlocked with each other via the protrusion 12. Further, the protrusions 12 are provided on the surfaces of the nuts 8 opposite to each other, and the elongated holes 11c are also provided on both sides of the nut 8 with the nut 8 in between (see FIG. 5).

The speed reducer 3 is arranged between the electric motor 2 and the first motion conversion mechanism 4. In the present embodiment, the planetary gear reduction mechanism 20 as shown in FIG. 2 is used as the reduction gear 3. Specifically, the planetary gear reduction mechanism 20 can rotate between the sun gear 21 as an input rotating body, the ring gear 22 as an orbital ring arranged on the outer periphery of the sun gear 21, and the sun gear 21 and the ring gear 22. It has a plurality of planetary gears 23 as planetary rotating bodies arranged in the above, and a carrier 24 as an output rotating body that rotatably holds each planetary gear 23.

The sun gear 21 is fixed to the rotating shaft 2a of the electric motor 2 so as to rotate integrally with the rotating shaft 2a. On the other hand, the ring gear 22 is fixed to the housing 6. The plurality of planetary gears 23 are assembled between the sun gear 21 and the ring gear 22 so as to mesh with them. The carrier 24 is fixed to the output destination screw shaft 7 so as to rotate integrally with the screw shaft 7.

In this embodiment, a brushed motor, a brushless motor, or the like is used as the electric motor 2. The electric motor 2 is electrically connected to a pair of relay circuits 13 (see FIG. 1) which are switching elements provided in the housing 6. Further, when the electric motor 2 is connected to the power supply (not shown) via the relay circuit 13, the power supply can supply power to the electric motor 2.

Subsequently, the basic operation of the electric actuator according to the present embodiment will be described.

When both contacts of each relay circuit 13 are OFF, power is not supplied from the power source to the electric motor 2, and the electric motor 2 is in a stopped state. From this state, when the contact of the relay circuit 13 for forward rotation is switched to the ON state by the signal of the control unit (not shown), a forward current flows from the power supply to the electric motor 2 and the electric motor 2 rotates forward. Will be. Further, when the contacts of the relay circuit 13 for reverse rotation are switched from the state in which both contacts of the relay circuit 13 are OFF to the state in which the contacts of the relay circuit 13 for reverse rotation are switched to the state of ON by the signal of the control unit, a current in the reverse direction is transmitted from the power supply to the electric motor 2. The flow electric motor 2 rotates in the reverse direction. By switching the contacts of each relay circuit 13 in this way, the electric motor 2 can be rotated forward or reverse from the stopped state.

When the electric motor 2 rotates forward or reverse, the rotational motion is transmitted to the planetary gear reduction mechanism 20 (reducer 3). As shown in FIG. 2, in the planetary gear reduction mechanism 20, the rotation shaft 2a of the electric motor 2 rotates, and the sun gear 21 rotates integrally with the rotation shaft 2a. When the sun gear 21 rotates, a plurality of planetary gears 23 that mesh with the sun gear 21 start rotating, and each planetary gear 23 revolves along the ring gear 22 while rotating. Then, the revolving motion of the planetary gear 23 is output as the rotational motion of the carrier 24 that supports it, so that the rotational motion of the electric motor 2 is decelerated.

The rotary motion decelerated by the speed reducer 3 is transmitted to the first motion conversion mechanism 4. That is, when the carrier 24 of the planetary gear reduction mechanism 20 rotates, the screw shaft 7 of the first motion conversion mechanism 4 rotates integrally with the carrier 24. When the screw shaft 7 rotates, the nut 8 moves linearly with the rotation. At this time, the nut 8 advances in the direction of arrow A1 in FIG. 1 when the electric motor 2 rotates in the forward direction, and retracts in the direction of arrow A2 in FIG. 1 when the electric motor 2 rotates in the reverse direction.

When the nut 8 moves forward or backward, the swing member 11 is pushed and moved by the protrusion 12 provided on the nut 8. As a result, the swing member 11 swings in the direction of arrow B1 or arrow B2 in FIG. 1, and the output shaft 14 rotates integrally with the swing member 11, so that the linear motion of the nut 8 is caused by the electric motor 2. It is output as a rotary motion of an axis (output shaft 14) in a direction different from that of the rotary shaft 2a. In the present embodiment, since the output shaft 14 is arranged in the direction orthogonal to the rotation shaft 2a of the electric motor 2, the rotational movement of the electric motor 2 is the rotation of the axis orthogonal to the rotation shaft 2a of the electric motor 2. It is output as an exercise.

Further, the linear motion of the nut 8 is regulated by the stopper portion 8a of the nut 8 and the stopper portion 10a of the thrust bearing 10 coming into contact with each other. Specifically, when the nut 8 moves forward or backward, the nut 8 approaches the thrust bearing 10 in the moving direction thereof, so that the stopper portion 8a of the nut 8 and the stopper portion 10a of the thrust bearing 10 come into contact with each other. At this time, since the stopper portion 10a of the thrust bearing 10 is rotating together with the screw shaft 7, the stopper portion 8a of the nut 8 and the stopper portion 10a of the thrust bearing 10 are engaged with each other in the rotational direction. As a result, the rotation of the screw shaft 7 is regulated, and the further axial movement (forward or backward) of the nut 8 is also regulated.

Hereinafter, the configurations of the output shaft 14 and the swing member 11 will be mainly described in detail.

FIG. 3 is a perspective view showing a state in which the output shaft 14 and the swing member 11 are separated, and FIG. 4 is a perspective view showing a state in which the output shaft 14 and the swing member 11 are assembled. Further, FIG. 5 is a cross-sectional view of the electric actuator cut at the positions of the output shaft 14 and the swing member 11.

As shown in FIGS. 3 and 4, in the present embodiment, each swinging member 11 has an annular fitting portion 11a and an arm portion 11b extending from the fitting portion 11a in the outer diameter direction thereof. There is. The arm portion 11b is formed with an elongated hole 11c into which a protrusion 12 provided on the nut 8 is inserted. On the other hand, the fitting portion 11a is formed with a hole portion 11d through which the output shaft 14 is inserted. By inserting the output shaft 14 into the hole 11d, the fitting portion 11a is fitted with the outer peripheral surface of the output shaft 14, and a pair of swinging members 11 are mounted on both end sides of the output shaft 14, respectively. It becomes a state.

Further, the rotation of the swing member 11 with respect to the output shaft 14 is restricted so that each swing member 11 does not rotate in the circumferential direction with respect to the output shaft 14 in a state where each swing member 11 is mounted on the output shaft 14. A rotation regulation structure 26 is provided. Specifically, the rotation regulation structure 26 is composed of a concave portion 31 provided in the fitting portion 11a of each rocking member 11 and a convex portion 32 provided on the outer peripheral surface of the output shaft 14. When each swing member 11 is mounted on the output shaft 14, as shown in FIG. 4, the concave portion 31 of the fitting portion 11a engages with the convex portion 32 of the output shaft 14, so that each swing member 11 swings with respect to the output shaft 14. The rotation of the member 11 is restricted.

Further, contrary to the present embodiment, the convex portion 32 may be provided in the fitting portion 11a and the concave portion 31 may be provided in the output shaft 14. Further, a plurality of convex portions 32 and concave portions 31 may be provided in the circumferential direction of the output shaft 14 and the fitting portion 11a.

Further, as in the example shown in FIG. 6, flat surfaces 14e and 11e are provided on the outer peripheral surface of the output shaft 14 and the inner peripheral surface of the fitting portion 11a, respectively, and these flat surfaces 14e and 11e are engaged with each other. Therefore, the rotation of the swing member 11 with respect to the output shaft 14 may be restricted. In FIG. 6, each of the flat surface portions 14e and 11e is provided on the output shaft 14 and the fitting portion 11a, but a plurality of the flat surface portions 14e and 11e may be provided respectively.

Further, as shown in FIG. 3, in the present embodiment, a pair of bearings 50 that rotatably support the output shaft 14 are arranged on both end sides of the output shaft 14. The bearing 50 according to the present embodiment is a slide bearing, and has a cylindrical portion 50a and a flange portion 50b having an outer diameter larger than that of the cylindrical portion 50a.

As shown in FIG. 5, when each bearing 50 is mounted on the outer peripheral surface of the output shaft 14 and the output shaft 14 is housed in the housing 6, each bearing 50 is interposed between the output shaft 14 and the housing 6. To do. In this state, the flange portion 50b of each bearing 50 includes the first step portion 14b having the smaller outer diameter and the housing 6 among the two-stage step portions 14b and 14c provided on the outer peripheral surface of the output shaft 14. It is held so that it is sandwiched between. Further, in this state, the fitting portion 11a of each swing member 11 is sandwiched between the flange portion 50b of the bearing 50 and the second step portion 14c having the larger outer diameter of the output shaft 14. Be retained. As a result, each swing member 11 is prevented from coming off with respect to the output shaft 14 in the axial direction. As described above, in the present embodiment, since the bearing 50 functions as the retaining structure 27 for the swinging member 11, it is not necessary to separately provide the retaining member for preventing the swinging member 11 from falling off in the axial direction.

Further, such a bearing 50 is not limited to a slide bearing, but may be a ball bearing, a roller bearing, or the like. Further, instead of the bearing 50, a retaining ring for preventing the swing member 11 from falling off in the axial direction may be used.

Further, as shown in FIG. 5, in a state where each member is assembled and housed in the housing 6, the nut 8 is sandwiched and held by the arm portion 11b of each swing member 11. As a result, even if the nut 8 receives a force in the rotation direction (direction of arrow C in FIG. 5) as the screw shaft 7 rotates, the arm portions 11b of each swing member 11 come into contact with both side surfaces of the nut 8. By holding the nut 8, the rotation of the nut 8 is restricted, and the rotational motion can be converted into a linear motion. The arm portion 11b may be arranged in a non-contact manner through a gap without contacting the side surface of the nut 8. Even in that case, it is possible to regulate the rotation of the nut 8 by contacting the side surface of the nut 8 with the arm portion 11b when the nut 8 tries to rotate.

Here, when the rotation of the nut 8 is regulated by the arm portion 11b, an outward force (force in the arrow D direction in FIG. 5) acts on each arm portion 11b due to the nut 8 trying to rotate. .. At this time, if the strength of the arm portion 11b is not sufficient, the nuts 8 push the arm portions 11b apart from each other, and the rotation of the nut 8 cannot be reliably regulated, or the arm portion 11b is deformed. There is a risk of Further, in the present embodiment, since the arm portion 11 is bent at the root side portion connected to the fitting portion 11a, stress concentration is likely to occur particularly at the bent portion.

Therefore, as in the example shown in FIG. 7, a rib 33 as a reinforcing portion may be provided on the root side portion of the arm portion 11b. The number of ribs 33 is not limited to one, and a plurality of ribs 33 may be provided. By providing such a rib 33, the strength of the arm portion 11b is improved, and the deformation of the arm portion 11b can be suppressed when the arm portion 11b receives a force in the rotational direction from the nut 8.

As described above, in the embodiment of the present invention, the swing member 11 is fitted to the outer peripheral surface of the output shaft 14 to prevent the swing member 11 from falling off in the direction intersecting the axial direction of the output shaft 14. By having the fitting portion 11a, the swing member 11 can be attached to the output shaft 14 so as not to fall off without welding the swing member 11 to the output shaft 14 or using a connecting pin. .. As a result, it becomes easy to ensure the quality assurance of durability, and the possibility that the connecting pin comes off can be avoided, and the reliability is improved.

The fitting portion 11a may not be formed in an annular shape as in the above-described embodiment. For example, as in the example shown in FIG. 8, the fitting portion 11a may be formed in a C shape in which a part thereof in the circumferential direction is cut out or opened. Also in this case, the swing member 11 can be attached to the output shaft 14 so as not to fall off in the direction intersecting the axial direction without using welding or connecting pins.

Further, the electric actuator according to the above-described embodiment is provided with two such swinging members, so that these functions are integrated into one swinging member (for example, the swinging member 200 shown in FIG. 9). Compared with the above, the shape of the swing member can be simplified and the manufacturing cost can be reduced.

Further, since the shape of the swing member 11 is simplified, it becomes easy to perform the assembly work of the parts. In particular, in the above-described embodiment, as shown in FIG. 3, a pair of swinging members 11, a pair of bearings 50, an output shaft 14, and a screw shaft 7, a nut 8, a radial bearing 9, and a thrust bearing 10 are assembled. Since the assembly (sliding screw unit) can be assembled in the axial direction of the output shaft 14, the assembling action is easy and the work efficiency is improved.

Further, the presence of two rocking members 11 improves the durability of the rocking members 11. That is, when the nut is held by one swinging member, the load for regulating the rotation of the nut may be concentrated on one swinging member, but by holding the nut by two swinging members, The load generated in one rocking member can be dispersed. As a result, deformation of the swinging member is less likely to occur, and the durability of the swinging member can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. It goes without saying that it can be carried out in various forms without departing from the gist of the present invention. For example, the present invention is applicable not only to the electric actuator provided with the speed reducer described above, but also to the electric actuator not provided with the speed reducer.

1 Electric actuator 2 Electric motor 2a Rotating shaft 4 First motion conversion mechanism 5 Second motion conversion mechanism 6 Housing 7 Screw shaft (rotating member)
8 nut (linear motion member)
11 Swing member 11a Fitting part 11b Arm part 11e Flat part 14 Output shaft 14e Flat part 26 Rotation regulation structure 27 Retaining structure 31 Recessed part 32 Convex part 33 Rib (reinforcing part)
50 bearings

Claims (5)

An electric motor, a first motion conversion mechanism that converts the rotational motion of the electric motor into a linear motion, and an axis that converts the linear motion output from the first motion conversion mechanism in a direction different from the rotation axis of the electric motor. An electric actuator equipped with a second motion conversion mechanism that converts the rotational motion of the
The first motion conversion mechanism includes a rotating member that is rotationally driven by the electric motor, and a linear motion member that linearly moves in the direction of the rotation axis as the rotating member rotates.
The second motion conversion mechanism has an output shaft and two swinging members that are attached to both ends of the output shaft and swing around the output shaft in conjunction with the linear motion member. And
The swing member has a fitting portion that fits on the outer peripheral surface of the output shaft so as not to rotate with respect to the output shaft and to fall off in a direction intersecting the axial direction. Actuator. A rotation regulation structure for restricting the rotation of the swing member with respect to the output shaft is provided between the output shaft and the fitting portion.
The rotation restricting structure includes a convex portion provided on one of the output shaft and the fitting portion, and a concave portion provided on the other of the output shaft and the fitting portion and engaging with the convex portion. The electric actuator according to claim 1. A rotation regulation structure for restricting the rotation of the swing member with respect to the output shaft is provided between the output shaft and the fitting portion.
The electric actuator according to claim 1, wherein the rotation regulation structure includes a flat surface portion of the output shaft and the fitting portion that engage with each other. A housing for accommodating the electric motor, the first motion conversion mechanism, and the second motion conversion mechanism.
A bearing that rotatably supports the output shaft is provided between the output shaft and the housing.
The electric actuator according to any one of claims 1 to 3, wherein the bearing functions as a retaining structure for preventing the swing member from falling off in the axial direction with respect to the output shaft. The swinging member has an arm portion that extends from the fitting portion and swings in conjunction with the linear motion member.
Any of claims 1 to 4, wherein a reinforcing portion for suppressing deformation of the arm portion when the arm portion receives a force in the rotational direction from the linear motion member is provided on the root portion side of the arm portion. The electric actuator according to item 1.

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