Electrically driven actuator

Abstract

The invention belongs to the technical field of electrically-driven actuators, and discloses an electrically-driven actuator which comprises a shell, a driver and a brake device, and the shell is provided with an installation space; the driver is mounted on the shell and comprises a transmission shaft, and the transmission shaft extends into the mounting space; the braking device is arranged in the mounting space and comprises a braking piece and an elastic piece, the braking piece comprises a braking part and an abutting part, the braking part faces the transmission shaft in the radial direction and is connected with the abutting part, and the elastic piece abuts between the inner wall of the mounting space and the abutting part so as to drive the braking part to brake the transmission shaft. According to the electrically-driven actuator, the elastic piece is used for driving the braking piece to press the transmission shaft, the transmission shaft is braked, and the shape requirement and the installation requirement for the braking piece, the shape requirement and the installation requirement for the elastic piece and the matching precision requirement for the braking piece and the elastic piece are lowered.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drive actuators, and in particular to electric drive actuators. Background Art

[0002] Electric drive actuators are widely used in the electric furniture industry, such as electric seats, electric sofas, electric beds, etc. Electric drive actuators are used as power parts to enable furniture products to switch to different postures to meet user needs. In order to brake the motor shaft of the electric drive actuator and keep the motor shaft in a specific posture, a braking device is usually configured to brake the motor shaft to prevent the motor shaft from reversing under the action of external loads.

[0003] The current braking device is usually composed of a braking element and an accumulator. The braking element, under the action of the accumulator, holds the motor shaft of the electric drive actuator tightly, and the motor shaft is braked by friction. However, the current braking device generally requires the accumulator to surround the entire outer circumference of the braking element, so that the braking element can be pressed against the motor shaft. The size of the accumulator is too large, the installation process of the accumulator is relatively complicated, and the matching accuracy between the braking element and the accumulator is high. Summary of the invention

[0004] The object of the present invention is to provide an electrically driven actuator, which utilizes an elastic member to drive a braking member to press a transmission shaft, thereby braking the transmission shaft.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An electrically driven actuator comprising:

[0007] A housing having an installation space;

[0008] A driver, mounted on the housing, the driver comprising a transmission shaft, the transmission shaft extending into the installation space;

[0009] A braking device is arranged in the installation space, and the braking device includes a braking member and an elastic member. The braking member includes a braking portion and an abutment portion. The braking portion radially faces the transmission shaft, and the braking portion is connected to the abutment portion. The elastic member abuts between the inner wall of the installation space and the abutment portion to drive the braking portion to brake the transmission shaft.

[0010] As an optional technical solution, the braking device also includes a rotating part, the braking part is connected to the rotating part, the rotating part is rotatably installed in the installation space, and the elastic part drives the braking part to rotate and press toward the transmission shaft with the rotating part as the rotation center, so that the braking part brakes the transmission shaft.

[0011] As an optional technical solution, the braking part includes a braking arc surface facing the transmission shaft, a first end surface extending from the braking arc surface to the rotating part, and a second end surface extending from the braking arc surface to the abutment part, and the rotation center of the rotating part, the arc center of the braking arc surface and the second end surface are located in the same extension plane.

[0012] As an optional technical solution, the installation space includes a rotation groove and an installation groove, the rotating part is rotatably embedded in the rotation groove, the abutment part and the elastic part are both located in the installation groove, and the elastic part abuts between the wall of the installation groove and the abutment part.

[0013] As an optional technical solution, a limit platform is provided on one side of the notch of the installation groove, the limit platform is opposite to the abutment portion in the axial direction, and the limit platform is used to limit the abutment portion from axially separating from the installation groove.

[0014] As an optional technical solution, an inclined surface is provided on the other side of the notch of the installation groove, and the inclined surface is used to guide the elastic member to slide into the installation groove.

[0015] As an optional technical solution, the inner wall of the revolving groove extends outward to form a limiting portion, and the limiting portion is used to limit the rotation space of the rotating part.

[0016] As an optional technical solution, the braking arc surface is provided with an elastic reinforcement portion facing the transmission shaft.

[0017] As an optional technical solution, the abutment portion includes a first abutment portion and a second abutment portion, and the elastic member includes a first elastic member and a second elastic member, the first elastic member abuts the first abutment portion, the second elastic member abuts the second abutment portion, a first extension surface of the first abutment portion extending away from the first elastic member is set at a first angle to the first end surface, and a second extension surface of the second abutment portion extending away from the second elastic member is set at a second angle to the second end surface.

[0018] As an optional technical solution, the braking portion is provided with an arc groove along the axial direction on one side of the driver body, a retaining spring is sleeved on the transmission shaft, the retaining spring is used to limit the transmission shaft, and the arc groove is used to avoid the retaining spring.

[0019] Beneficial effects of the present invention:

[0020] The electric drive actuator provided by the present invention includes a housing, a driver and a brake device, wherein the housing is provided with an installation space; the driver is installed in the housing, the driver includes a transmission shaft, and the transmission shaft extends into the installation space; the brake device is arranged in the installation space, the brake device includes a brake member and an elastic member, the brake member includes a brake portion and an abutment portion, the brake portion radially faces the transmission shaft, the brake portion is connected to the abutment portion, and the elastic member abuts between the inner wall of the installation space and the abutment portion to drive the brake portion to brake the transmission shaft. The present invention simplifies the structure of the brake device, reduces the shape requirements and installation requirements of the brake member, the shape requirements and installation requirements of the elastic member, and the matching accuracy requirements of the brake member and the elastic member. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the electric drive actuator of the present invention from a first viewing angle;

[0022] Figure 2 is an exploded view of the electric drive actuator of the present invention from a first perspective;

[0023] Figure 3 is an exploded view of the electric drive actuator of the present invention from a second perspective;

[0024] Figure 4 It is a structural schematic diagram of the right shell of the present invention;

[0025] Figure 5 It is a first structural schematic diagram of the braking device of the present invention;

[0026] Figure 6 is a second structural schematic diagram of the braking device of the present invention;

[0027] Figure 7 is a third structural schematic diagram of the braking device of the present invention;

[0028] Figure 8 is a fourth structural schematic diagram of the braking device of the present invention;

[0029] In the figure:

[0030] 1. Shell; 11. Left shell; 12. Right shell; 121. Installation space; 1211. Rotation groove; 1212. Installation groove; 1213. Limiting part; 122. First through hole; 123. Third through hole; 124. Limiting platform; 125. Inclined surface; 126. Second through hole;

[0031] 2. Driver; 21. Transmission shaft;

[0032] 3. Braking device; 31. Braking member; 311. Rotating portion; 312. Braking portion; 3121. Braking arc surface; 3122. First end surface; 3123. Second end surface; 3124. Arc groove; 3125. Elastic reinforcement portion; 313. Abutting portion; 313a. First abutting portion; 313b. Second abutting portion; 314. Limiting column; 32. Elastic member; 32a. First elastic member; 32b. Second elastic member;

[0033] 4. Threaded fasteners; DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] like Figures 1 to 8As shown, the electric drive actuator provided in this embodiment includes a shell 1, a driver 2 and a braking device 3, the shell 1 is provided with an installation space 121; the driver 2 is installed in the shell 1, the driver 2 includes a transmission shaft 21, and the transmission shaft 21 extends into the installation space 121; the braking device 3 is arranged in the installation space 121, the braking device 3 includes a braking member 31 and an elastic member 32, the braking member 31 includes a braking portion 312 and an abutting portion 313, the braking portion 312 is radially toward the transmission shaft 21, the braking portion 312 is connected to the abutting portion 313, and the elastic member 32 abuts between the inner wall of the installation space 121 and the abutting portion 313 to drive the braking portion 312 to brake the transmission shaft 21.

[0039] This embodiment simplifies the structure of the brake device 3 , reduces the shape requirements and installation requirements for the brake member 31 , the shape requirements and installation requirements for the elastic member 32 , and the matching accuracy requirements for the brake member 31 and the elastic member 32 .

[0040] The driver 2 of this embodiment is a motor, the transmission shaft 21 is the output shaft of the motor, the furniture product is a smart bed, the transmission shaft 21 extends into the installation space 121, one end of the elastic member 32 abuts against the inner wall of the installation space 121, and the other end of the elastic member 32 abuts against the abutment portion 313, providing elastic support force for the brake portion 312, and the brake portion 31 always maintains pressure on the periphery of the transmission shaft 21 under the elastic support force of the elastic member 32. When the electric drive actuator drives the bed board of the smart bed to rise, the transmission shaft 21 rotates forward and transmits power to the transmission device such as a round aluminum tube, and the transmission device extends and drives the bed board of the smart bed to rise. At this time, due to the large weight of the bed board, a reaction force is applied to the transmission device, and the transmission device transmits the reaction force to the transmission shaft 21. Since the brake portion 312 always applies pressure to the periphery of the transmission shaft 21, it can prevent the transmission shaft 21 from reversing, ensuring that the transmission device maintains the current length, so that the bed board can maintain the current lifting height. Similarly, when the electric drive actuator drives the bed board of the smart bed to descend, the brake part 312 still applies pressure to the transmission shaft 21 to prevent the transmission shaft 21 from accelerating and reversing, thereby avoiding the bed board from descending suddenly at an accelerated speed or even out of control.

[0041] like Figures 5 to 8 As shown, in this embodiment, the brake device 3 further includes a rotating portion 311, a brake portion 312 is connected to the rotating portion 311, the rotating portion 311 is rotatably mounted in the mounting space 121, and the elastic member 32 drives the brake member 31 to rotate and press toward the transmission shaft 21 with the rotating portion 311 as the rotation center, so that the brake member 312 brakes the transmission shaft 21. The brake member 31 of this embodiment is rotatably mounted in the revolving groove 1211 to prevent the brake member 31 from getting stuck.

[0042] In some other embodiments, abutment portions 313 are respectively provided at both ends of the braking portion 312 , each abutment portion 313 is abutted by an elastic member 32 , and the two elastic members 32 jointly apply thrust to the braking member 31 to press the braking portion 312 radially toward the transmission shaft 21 .

[0043] Optionally, the braking portion 312 includes a braking arc surface 3121 facing the transmission shaft 21, a first end surface 3122 extending from the braking arc surface 3121 to the rotating portion 311, and a second end surface 3123 extending from the braking arc surface 3121 to the abutting portion 313, and the rotation center of the rotating portion 311, the arc center of the braking arc surface 3121, and the second end surface 3123 are located in the same extension plane. The braking arc surface 3121 has a large area, which can ensure that the braking portion 312 is in surface contact with the transmission shaft 21, increase the contact area, and provide a braking effect. The transition portion between the rotating portion 311 and the first end surface 3122 and the transition portion between the abutting portion 313 and the second end surface 3123 are both thicker, which can avoid breakage under high force conditions.

[0044] Optionally, the angle corresponding to the braking camber 3121 is 90° to 270°. In the present embodiment, the angle corresponding to the braking camber 3121 is 180°, and the braking portion 312 is a semicircular arc structure, which can save materials and reduce costs while ensuring the braking effect. In some other cases, the angle corresponding to the braking camber 3121 is 90°, which can further save materials, but the area of ​​the braking camber 3121 is reduced, and the braking effect is reduced, or the angle corresponding to the braking camber 3121 is 270°, which increases the material consumption, but increases the area of ​​the braking portion 312, and improves the braking effect.

[0045] Optionally, the installation space 121 includes a rotation groove 1211 and a mounting groove 1212 , the rotating portion 311 is rotatably embedded in the rotation groove 1211 , the abutting portion 313 and the elastic member 32 are both located in the mounting groove 1212 , and the elastic member 32 abuts between the wall of the mounting groove 1212 and the abutting portion 313 .

[0046] The rotating part 311 is a rotating body structure, such as a cylindrical structure, a spherical structure or other special-shaped structures that can rotate in the rotating groove 1211, such as a polygonal prism, a pyramid structure, etc. The rotating part 311 is adapted to be embedded in the rotating groove 1211, and the brake member 31 uses the rotation center line of the rotating part 311 as the rotation center line to ensure the smoothness of the rotation.

[0047] In this embodiment, the rotation amplitude of the brake member 31 is small, and the rotation amplitude of the brake member 31 is related to the circumference of the transmission shaft 21. Generally speaking, the circumference of the transmission shaft 21 can meet the use requirements. When the brake member 31 rotates, the elastic member 32 is further compressed or extended.

[0048] In this embodiment, the angle corresponding to the braking arc surface 3121 is 180°, and the braking portion 312 is a semicircular arc structure.

[0049] Optionally, a limiting platform 124 is provided on one side of the notch of the installation groove 1212 , and the limiting platform 124 is opposite to the abutment portion 313 in the axial direction. The limiting platform 124 is used to limit the abutment portion 313 from axially separating from the installation groove 1212 .

[0050] Optionally, an inclined surface 125 is provided on the other side of the notch of the installation groove 1212 , and the inclined surface 125 is used to guide the elastic member 32 to slide into the installation groove 1212 .

[0051] Optionally, the inner wall of the rotary groove 1211 extends outward to form a limiting portion 1213 , and the limiting portion 1213 is used to limit the rotation space of the rotating portion 311 .

[0052] like Figure 6 and Figure 7 As shown, optionally, the braking arc surface 3121 is provided with an elastic reinforcement portion 3125 facing the transmission shaft 21. The elastic reinforcement portion 3125 abuts against the transmission shaft 21. In this embodiment, the elastic reinforcement portion 3125 is a notch on the braking arc surface 3121, and the notch extends radially along the braking arc surface 3121. Since the volume of the brake member 31 is relatively small, after the notch is provided on the braking arc surface 3121 of the braking portion 312, when the transmission shaft 21 rotates, the braking portion 312 is more easily elastically deformed by the force of the transmission shaft 21, and the notch will be deformed to a certain extent when abutting against the transmission shaft 21, and the contact area will also be increased compared to the contact area when the flat braking arc surface 3121 contacts the transmission shaft 21, and the braking effect is also better. The surface of the braking arc surface 3121 is coated with lubricating oil, and the lubricating oil has viscosity. The thicker the oil film, the stronger the protection to the friction surface. When the braking arc surface 3121 brakes the transmission shaft 21, the lubricating oil can reduce the wear between the braking part 312 and the transmission shaft 21. At the same time, the lubricating oil has a certain viscosity and can maintain the braking effect. The notch on the braking arc surface 3121 can store more lubricating oil than the flat braking arc surface 3121, thereby extending the service life of the braking device 3.

[0053] In some other embodiments, the notch extends in a direction at a certain angle to the axial direction of the braking arc surface 3121 , or the notch extends on the braking arc surface 3121 in an “S” shape, a “W” shape, an “X” shape, or the like.

[0054] In some other embodiments, the elastic reinforcement portion 3125 may be a groove that is recessed inwardly on the surface of the braking arc surface 3121 , and the groove may be one or more.

[0055] like Figure 8As shown, optionally, the abutment portion 313 includes a first abutment portion 313a and a second abutment portion 313b, the elastic member 32 includes a first elastic member 32a and a second elastic member 32b, the first elastic member 32a abuts the first abutment portion 313a, the second elastic member 32b abuts the second abutment portion 313b, the first extension surface of the first abutment portion 313a extending away from the first elastic member 32a is arranged at a first angle with the first end surface 3122, and the second extension surface of the second abutment portion 313b extending away from the second elastic member 32b is arranged at a second angle with the second end surface 3123. The first angle and the second angle may be equal or unequal.

[0056] In some embodiments, the abutting portions 313 are provided in two or more numbers, wherein the two abutting portions 313 are respectively the first abutting portion 313a and the second abutting portion 313b, and the elastic members 32 are provided in two or more numbers, wherein the two elastic members 32 are respectively the first elastic member 32a and the second elastic member 32b. By applying a greater thrust to the brake member 31 using a plurality of elastic members 32, the braking effect can be improved.

[0057] like Figures 5 to 7 As shown, in this embodiment, the abutting portion 313 is provided as one, and the central axis of the rotating portion 311, the arc center of the braking portion 312, and the extending surface of the abutting portion 313 away from the elastic member 32 are all located on the same extending plane.

[0058] Optionally, the brake part 312 is provided with an arc groove 3124 on one side of the axial direction toward the driver 2 body, and a retaining spring is sleeved on the transmission shaft 21, the retaining spring is used to limit the transmission shaft 21, and the arc groove 3124 is used to avoid the retaining spring. Specifically, the retaining spring is used to prevent the transmission shaft 21 from loosening, and the retaining spring abuts against the bottom of the arc groove 3124 to generate a force on the brake part 312. The arc groove 3124 can avoid the retaining spring, thereby increasing the force of the brake part 312 on the transmission shaft 21. The retaining spring is an existing component and is not shown again.

[0059] In this embodiment, the peripheral wall of the root of the transmission shaft 21 is not provided with screw threads, and the output end of the transmission shaft 21 away from the root is provided with screw threads, and the screw threads of the transmission shaft 21 are meshed and connected with the worm gear.

[0060] In some other embodiments, a groove is provided on the abutting portion 313 and / or the mounting groove 1212 , and one end of the elastic member 32 is inserted into the groove. The groove prevents the elastic member 32 from falling off and prevents the elastic member 32 from falling off the abutting portion 313 .

[0061] In this embodiment, the abutting portion 313 is provided with a limiting column 314 , and the elastic member 32 is a spring, which is sleeved around the limiting column 314 , thereby preventing the spring from being separated from the abutting portion 313 .

[0062] like Figures 1 to 4As shown, optionally, the shell 1 includes a left shell 11 and a right shell 12, and the left shell 11 and the right shell 12 are detachably connected, for example, the left shell 11 and the right shell 12 are connected and fixed with screws, and the driver 2 is detachably installed on a side of the right shell 12 away from the left shell 11.

[0063] Optionally, an installation space 121 is provided on the right shell 12, a first through hole 122 is provided in the middle of the installation space 121, a rotating groove 1211 and an installation groove 1212 surround the circumference of the first through hole 122, the transmission shaft 21 passes through the first through hole 122 and extends into the interior of the shell 1, and the right shell 12 is also provided with a second through hole 126, and the threaded fastener 4 passes through the second through hole 126 from the side of the right shell 12 facing the left shell 11 and is threadedly connected to the driver 2. The driver 2 covers the installation space 121, the first through hole 122, the second through hole 126 and the braking device 3 together, which can ensure beauty. At the same time, it can prevent the braking device 3 and the threaded fastener 4 used to fix the driver 2 from being exposed, so as to ensure the service life of the braking device 3 and the threaded fastener 4 and prevent dust and impurities from falling onto the braking device 3.

[0064] Optionally, a third through hole 123 is provided at the bottom of the mounting groove 1212 , the third through hole 123 connects the interior of the shell 1 and the mounting groove 1212 , and the third through hole 123 is aligned with the limit platform 124 in the axial direction, and the third through hole 123 is used as a demoulding port.

[0065] Specifically, when the brake device 3 is installed in the installation space 121, the elastic member 32 is first sleeved on the circumference of the limiting column 314, and then the brake member 31 and the elastic member 32 are axially close to the installation space 121. At this time, the rotating portion 311 is aligned with the rotating groove 1211, and the abutting portion 313 is aligned with the installation groove 1212. When the brake device 3 is further close to the installation space 121, the rotating portion 311 begins to be embedded in the rotating groove 1211, and the end of the elastic member 32 away from the abutting portion 313 abuts against the inclined surface 125. At this time, the inclined surface 125 is 25 has a guiding and compressing effect on the elastic member 32. The elastic member 32 is continuously compressed. When the rotating portion 311 is completely embedded in the rotary groove 1211, the abutting portion 313 and the elastic member 32 are also completely installed in the mounting groove 1212. The operator releases the brake member 31. Due to the action of the elastic member 32, the abutting portion 313 is pushed to contact the side wall of the mounting groove 1212. A part of the abutting portion 313 is aligned with the limit platform 124 in the axial direction. The limit platform 124 can prevent the abutting portion 313 from axially disengaging from the mounting groove 1212.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An electrically driven actuator, characterized in that: include: The housing (1) is provided with an installation space (121); A driver (2) is mounted on the housing (1), the driver (2) comprising a transmission shaft (21), and the transmission shaft (21) extends into the installation space (121); A braking device (3) is arranged in the installation space (121), the braking device (3) comprises a braking member (31) and an elastic member (32), the braking member (31) comprises a braking portion (312) and an abutting portion (313), the braking portion (312) is radially oriented toward the transmission shaft (21), the braking portion (312) is connected to the abutting portion (313), and the elastic member (32) abuts between an inner wall of the installation space (121) and the abutting portion (313) to drive the braking portion (312) to brake the transmission shaft (21).

2. The electrically driven actuator according to claim 1, characterized in that: The braking device (3) further comprises a rotating part (311), the braking part (312) being connected to the rotating part (311), the rotating part (311) being rotatably mounted in the mounting space (121), and the elastic member (32) driving the braking member (31) to rotate and press toward the transmission shaft (21) with the rotating part (311) as the rotation center, so that the braking part (312) brakes the transmission shaft (21).

3. The electrically driven actuator according to claim 2, characterized in that: The braking portion (312) comprises a braking arc surface (3121) facing the transmission shaft (21), a first end surface (3122) extending from the braking arc surface (3121) to the rotating portion (311), and a second end surface (3123) extending from the braking arc surface (3121) to the abutting portion (313), and the rotation center of the rotating portion (311), the arc center of the braking arc surface (3121) and the second end surface (3123) are located in the same extension plane.

4. The electrically driven actuator according to claim 2, characterized in that: The installation space (121) comprises a rotation groove (1211) and a mounting groove (1212); the rotating portion (311) is rotatably embedded in the rotation groove (1211); the abutment portion (313) and the elastic member (32) are both located in the mounting groove (1212); and the elastic member (32) abuts between a wall of the mounting groove (1212) and the abutment portion (313).

5. The electrically driven actuator according to claim 4, characterized in that: A limiting platform (124) is provided on one side of the notch of the installation groove (1212), and the limiting platform (124) is opposite to the abutment portion (313) in the axial direction. The limiting platform (124) is used to limit the abutment portion (313) from axially disengaging from the installation groove (1212).

6. The electrically driven actuator according to claim 4, characterized in that: An inclined surface (125) is provided on the other side of the notch of the installation groove (1212), and the inclined surface (125) is used to guide the elastic member (32) to slide into the installation groove (1212).

7. The electrically driven actuator according to claim 4, characterized in that: The inner wall of the revolving groove (1211) extends outward to form a limiting portion (1213), and the limiting portion (1213) is used to limit the rotation space of the rotating portion (311).

8. The electrically driven actuator according to claim 3, characterized in that: The braking arc surface (3121) is provided with an elastic reinforcement portion (3125) facing the transmission shaft (21).

9. The electrically driven actuator according to claim 3, characterized in that: The abutment portion (313) includes a first abutment portion (313a) and a second abutment portion (313b); the elastic member (32) includes a first elastic member (32a) and a second elastic member (32b); the first elastic member (32a) abuts against the first abutment portion (313a); the second elastic member (32b) abuts against the second abutment portion (313b); a first extension surface of the first abutment portion (313a) extending away from the first elastic member (32a) is arranged at a first angle to the first end surface (3122); a second extension surface of the second abutment portion (313b) extending away from the second elastic member (32b) is arranged at a second angle to the second end surface (3123).

10. The electrically driven actuator according to claim 1, characterized in that: The braking portion (312) is provided with an arc-shaped groove (3124) on one side axially facing the driver (2) body, and a retaining spring is sleeved on the transmission shaft (21), the retaining spring is used to limit the transmission shaft (21), and the arc-shaped groove (3124) is used to avoid the retaining spring.

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