Electrically driven actuator and brake assembly

Abstract

An electrically driven actuator and a brake assembly. The electrically driven actuator comprises a housing (1), a driver (2) and a brake device (3), the housing (1) being provided with a mounting space (121), and the driver (2) being mounted on the housing (1). The driver (2) comprises a drive shaft (21), the drive shaft (21) extending into the mounting space (121). The brake device (3) is arranged in the mounting space (121), and the brake device (3) comprises a brake member (31) and an elastic member (32), the brake member (31) comprising a brake portion (312) and an abutting portion (313), the brake portion (312) facing the drive shaft (21) in the radial direction, the brake portion (312) being connected to the abutting portion (313), and the elastic member (32) being provided in an abutting manner between the inner wall of the mounting space (121) and the abutting portion (313), so as to drive the brake portion (312) to brake the drive shaft (21).

Description

Electric drive actuator and brake assembly

[0001] The present application claims priority to Chinese Patent Application No. 202411358232.4, filed on September 27, 2024, and Chinese Patent Application No. 202422366166.7, filed on September 27, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric drive actuators, for example to electric drive actuator and brake assemblies. BACKGROUND

[0003] 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 components to enable furniture products to switch between different postures to meet the needs of users. In order to brake the motor shaft of the electric drive actuator and enable the motor shaft to be maintained in a specific posture, a brake device is usually configured to brake the motor shaft to prevent the motor shaft from reversing under the action of external load.

[0004] The current brake device is usually composed of a brake element and an accumulator. The brake element is clamped around the motor shaft of the electric drive actuator under the action of the accumulator, and the motor shaft is braked by friction. However, the current brake device generally requires the accumulator to surround the entire outer peripheral surface of the brake element, thereby enabling the brake element to be pressed tightly against the motor shaft. The size of the accumulator is too large, the installation process of the accumulator is relatively complex, and the matching precision between the brake element and the accumulator is high. SUMMARY

[0005] The present application provides an electric drive actuator and a brake assembly. The electric drive actuator uses an elastic member to drive a brake member to press a transmission shaft, thereby braking the transmission shaft. The brake assembly uses an elastic member to drive a brake member to press a drive output shaft, thereby braking the drive output shaft.

[0006] In a first aspect, the embodiments of the present application provide an electric drive actuator, comprising:

[0007] a housing, provided with a mounting space;

[0008] a drive, mounted in the housing, the drive comprising a transmission shaft, the transmission shaft extending into the mounting space;

[0009] The brake device is arranged in the mounting space, and comprises a brake member and an elastic member. The brake member comprises a brake portion and an abutting portion. The brake portion is radially directed towards the transmission shaft. The abutting portion is connected to the brake portion. The elastic member is abutted between the inner wall of the mounting space and the abutting portion to drive the brake portion to brake the transmission shaft.

[0010] In a second aspect, the embodiments of the present application provide a brake assembly arranged to brake the output shaft of the driver, comprising:

[0011] a brake member, the brake member comprising a brake portion and an abutting portion arranged on the brake portion;

[0012] an elastic member abutted to the abutting portion;

[0013] The elastic member is arranged to drive the brake portion to press against the output shaft of the driver. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a structural schematic diagram of the electric drive actuator of the first aspect of the embodiments of the present application from a first perspective;

[0015] Fig. 2 is an exploded view of the electric drive actuator of the first aspect of the embodiments of the present application from the first perspective;

[0016] Fig. 3 is an exploded view of the electric drive actuator of the first aspect of the embodiments of the present application from a second perspective;

[0017] Fig. 4 is a structural schematic diagram of the right shell of the first aspect of the embodiments of the present application;

[0018] Fig. 5 is a first structural schematic diagram of the brake device of the first aspect of the embodiments of the present application;

[0019] Fig. 6 is a second structural schematic diagram of the brake device of the first aspect of the embodiments of the present application;

[0020] Fig. 7 is a third structural schematic diagram of the brake device of the first aspect of the embodiments of the present application;

[0021] Fig. 8 is a fourth structural schematic diagram of the brake device of the first aspect of the embodiments of the present application;

[0022] Fig. 9 is a first structural schematic diagram of the brake assembly of the second aspect of the embodiments of the present application;

[0023] Fig. 10 is a second structural schematic diagram of the brake assembly of the second aspect of the embodiments of the present application;

[0024] Fig. 11 is a third structural schematic diagram of the brake assembly of the second aspect of the embodiments of the present application;

[0025] Fig. 12 is a fourth structural schematic diagram of the brake assembly of the second aspect of the embodiments of the present application;

[0026] Fig. 13 is a fifth structural schematic view of the brake assembly of the second embodiment of the present application;

[0027] Fig. 14 is a sixth structural schematic view of the brake assembly of the second embodiment of the present application;

[0028] Fig. 15 is a seventh structural schematic view of the brake assembly of the second embodiment of the present application;

[0029] Fig. 16 is an eighth structural schematic view of the brake assembly of the second embodiment of the present application.

[0030] In the drawings: 1, housing; 11, left shell; 12, right shell; 121, mounting space; 1211, rotation groove; 1212, mounting groove; 1213, limiting portion; 122, first through hole; 123, third through hole; 124, limiting table; 125, inclined surface; 126, second through hole; 2, driver; 21, transmission shaft; 3, brake device; 31, brake piece; 311, rotation portion; 312, brake portion; 3121, brake arc surface; 3122, first end surface; 3123, second end surface; 3124, arc-shaped groove; 3125, elastic reinforcing portion; 313, abutting portion; 313a, first abutting portion; 313b, second abutting portion; 314, limiting column; 32, elastic piece; 32a, first elastic piece; 32b, second elastic piece; 4, threaded fastener. DETAILED DESCRIPTION

[0031] In the description of the present application, unless specifically defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the meaning of the above terms in the present application can be understood as appropriate.

[0032] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

[0034] Embodiment one:

[0035] As shown in FIGS. 1-8, the electric drive actuator provided by the present embodiment includes a housing 1, a driver 2, and a brake device 3, the housing 1 is provided with a mounting space 121; the driver 2 is mounted on the housing 1, the driver 2 includes a transmission shaft 21, the transmission shaft 21 extends into the mounting space 121; the brake device 3 is arranged in the mounting space 121, the brake device 3 includes a brake member 31 and an elastic member 32, the brake member 31 includes a brake portion 312 and an abutting portion 313, the brake portion 312 is radially towards the transmission shaft 21, the brake portion 312 is connected with the abutting portion 313, the elastic member 32 is abutted between the inner wall of the mounting space 121 and the abutting portion 313, so as to drive the brake portion 312 to brake the transmission shaft 21.

[0036] The present embodiment simplifies the structure of the brake device 3, reduces the shape requirement and installation requirement of the brake member 31, the shape requirement and installation requirement of the elastic member 32, and the matching precision requirement of the brake member 31 and the elastic member 32.

[0037] The driver 2 of the present 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 mounting space 121, the first end of the elastic member 32 is abutted to the inner wall of the mounting space 121, the second end of the elastic member 32 is abutted to the abutting portion 313, providing elastic support force for the brake portion 312, the brake member 31 always maintains pressure on the peripheral portion 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 pipe, the transmission device elongates and drives the bed board of the smart bed to rise, at this time, due to the large weight of the bed board, the transmission device transmits the reaction force to the transmission shaft 21, and the brake portion 312 always applies pressure to the peripheral portion of the transmission shaft 21, which can prevent the transmission shaft 21 from reversing, ensure that the transmission device maintains the current length, so that the bed board can maintain the current rising height. Similarly, when the electric drive actuator drives the bed board of the smart bed to descend, the brake portion 312 still applies pressure to the transmission shaft 21, preventing the transmission shaft 21 from accelerating in reverse, avoiding the bed board from suddenly accelerating or even losing control when descending.

[0038] As shown in FIGS. 5-8, in the present embodiment, the brake device 3 further comprises a rotating portion 311, the brake portion 312 is connected with the rotating portion 311, the rotating portion 311 is rotatably installed in the installation space 121, and the elastic member 32 drives the brake member 31 to rotate and press against the transmission shaft 21 with the rotating portion 311 as the rotation center, so that the brake portion 312 brakes the transmission shaft 21. The brake member 31 of the present embodiment is rotatably installed in the rotating groove 1211, so that the brake member 31 is prevented from being stuck.

[0039] In other embodiments, the brake portion 312 is provided with an abutting portion 313 at each end, and each abutting portion 313 is abutted by an elastic member 32. The two elastic members 32 jointly apply a pushing force to the brake member 31, so that the brake portion 312 is pressed against the transmission shaft 21 in the radial direction.

[0040] Optionally, the brake portion 312 comprises a brake arc surface 3121 facing the transmission shaft 21, a first end surface 3122 extending from the brake arc surface 3121 to the rotating portion 311, and a second end surface 3123 extending from the brake arc surface 3121 to the abutting portion 313. The rotation center of the rotating portion 311, the arc center of the brake arc surface 3121, and the second end surface 3123 are located in the same extension plane. The brake arc surface 3121 has a large area, which can ensure that the brake portion 312 is in surface contact with the transmission shaft 21, increase the contact area, and improve the braking effect. The transition between the rotating portion 311 and the first end surface 3122 and the transition between the abutting portion 313 and the second end surface 3123 are relatively thick, which can avoid breaking under a large force.

[0041] Optionally, the corresponding angle of the brake arc surface 3121 is 90°-270°. In the present embodiment, the corresponding angle of the brake arc surface 3121 is 180°, and the brake portion 312 has a semicircular arc structure. In the case of ensuring the braking effect, the brake portion 312 can also save materials and reduce costs. In other embodiments, the corresponding angle of the brake arc surface 3121 is 90°, which can further save materials, but the area of the brake arc surface 3121 is reduced, the braking effect is reduced, or the corresponding angle of the brake arc surface 3121 is 270°, which increases the use of materials, but the area of the brake portion 312 is increased, and the braking effect is improved.

[0042] Optionally, the installation space 121 comprises a rotating groove 1211 and an installation groove 1212, the rotating portion 311 is rotatably embedded in the rotating groove 1211, the abutting portion 313 and the elastic member 32 are located in the installation groove 1212, and the elastic member 32 is abutted between the wall of the installation groove 1212 and the abutting portion 313.

[0043] The rotating part 311 is a rotary body structure, for example, a cylindrical structure, a spherical structure or other special-shaped structures that can rotate in the rotary groove 1211, such as a polygonal prism, a pyramid structure, etc. The rotating part 311 is adapted to be embedded in the rotary groove 1211, and the brake part 31 rotates around the rotary center line of the rotating part 311 as the rotary center line to ensure smooth rotation.

[0044] In this embodiment, the rotating amplitude of the brake part 31 is small, and the rotating amplitude of the brake part 31 is related to the concentricity of the transmission shaft 21. Generally, the concentricity of the transmission shaft 21 can meet the use requirements. When the brake part 31 rotates, the elastic part 32 is further compressed or elongated.

[0045] In this embodiment, the corresponding angle of the brake camber surface 3121 is 180°, and the brake part 312 is a semicircular arc structure.

[0046] Optionally, one side of the slot of the mounting groove 1212 is provided with a limiting table 124, the limiting table 124 is opposite to the abutting part 313 in the axial direction, and the limiting table 124 is arranged to limit the abutting part 313 from separating from the mounting groove 1212 in the axial direction.

[0047] Optionally, the other side of the slot of the mounting groove 1212 is provided with an inclined surface 125, and the inclined surface 125 is arranged to guide the elastic part 32 to slide into the mounting groove 1212.

[0048] Optionally, the inner wall of the rotary groove 1211 extends outward (i.e. towards the direction away from itself) to form a limiting part 1213, and the limiting part 1213 is arranged to limit the rotating space of the rotating part 311.

[0049] As shown in FIGS. 6 and 7, optionally, the brake camber surface 3121 is provided with an elastic reinforcing part 3125 facing the transmission shaft 21. The elastic reinforcing part 3125 abuts against the transmission shaft 21. In this embodiment, the elastic reinforcing part 3125 is a notch on the brake camber surface 3121, and the notch extends along the radial direction of the brake camber surface 3121. Since the brake part 31 has a small volume, after the notch is formed on the brake camber surface 3121 of the brake part 312, the brake part 312 is more easily elastically deformed under the action of the transmission shaft 21 when the transmission shaft 21 rotates, and the notch will deform to a certain extent when it abuts against the transmission shaft 21, and the contact area will also increase compared with the contact area when the smooth brake camber surface 3121 abuts against the transmission shaft 21, and the braking effect is also better. The brake camber surface 3121 is coated with lubricating oil, and the lubricating oil has viscosity, and the thicker the oil film, the stronger the protection of the friction surface. When the brake camber surface 3121 brakes the transmission shaft 21, the lubricating oil can reduce the wear between the brake part 312 and the transmission shaft 21, and at the same time, the lubricating oil has a certain viscosity, which can maintain the braking effect. The notch on the brake camber surface 3121 can store more lubricating oil than the smooth brake camber surface 3121, thereby prolonging the service life of the brake device 3.

[0050] In some other embodiments, the notch extends along a direction that is at an angle to the axial direction of the braking cam surface 3121, or the notch extends in an "S" shape, a "W" shape, an "X" shape, or the like on the braking cam surface 3121.

[0051] In some other embodiments, the elastic reinforcing portion 3125 can be a groove that is concave inward on the surface of the braking cam surface 3121, and the groove can be one or more.

[0052] As shown in FIG. 8, optionally, the abutting portion 313 includes a first abutting portion 313a and a second abutting portion 313b, and the elastic member 32 includes a first elastic member 32a and a second elastic member 32b, the first elastic member 32a abuts the first abutting portion 313a, the second elastic member 32b abuts the second abutting portion 313b, a first extension surface of the first abutting portion 313a that extends away from the first elastic member 32a is disposed at a first included angle a1 with the first end surface 3122, and a second extension surface of the second abutting portion 313b that extends away from the second elastic member 32b is disposed at a second included angle a2 with the second end surface 3123. The first included angle a1 and the second included angle a2 can be equal or not equal.

[0053] In some embodiments, the first included angle a1 and the second included angle a2 can be set according to actual needs.

[0054] In some embodiments, the abutting portion 313 is provided in two or more numbers, of which the two abutting portions 313 are respectively the first abutting portion 313a and the second abutting portion 313b, and the elastic member 32 is provided in two or more numbers, of which the two elastic members 32 are respectively the first elastic member 32a and the second elastic member 32b. Using multiple elastic members 32 to exert greater thrust on the braking member 31 can improve the braking effect.

[0055] As shown in FIGS. 5 to 7, in the present embodiment, the abutting portion 313 is provided in one, and the central axis of the rotating portion 311, the cam center of the braking portion 312, and the extension surface of the abutting portion 313 away from the elastic member 32 are all located on the same extension plane.

[0056] Optionally, the braking portion 312 is provided with an arc-shaped groove 3124 on the side that faces the body of the driver 2 in the axial direction, a circlip is provided on the transmission shaft 21, the circlip is configured to limit the transmission shaft 21, and the arc-shaped groove 3124 is configured to avoid the circlip. Exemplarily, the circlip is used to prevent the transmission shaft 21 from loosening, the circlip abuts the groove bottom of the arc-shaped groove 3124, and an acting force is generated on the braking portion 312, the arc-shaped groove 3124 can avoid the circlip, and the acting force of the braking portion 312 on the transmission shaft 21 is increased. The circlip can refer to the elastic structure in the related art.

[0057] In the embodiment, the peripheral wall of the root of the transmission shaft 21 is not provided with the screw thread, the output end of the transmission shaft 21 away from the root is provided with the screw thread, and the screw thread of the transmission shaft 21 is in meshing connection with the worm wheel.

[0058] In other embodiments, at least one of the abutting portion 313 and the mounting groove 1212 is provided with a containing groove, one end of the elastic member 32 is inserted into the containing groove, the containing groove plays a role of preventing the elastic member 32 from being separated from the abutting portion 313.

[0059] In the embodiment, the abutting portion 313 is provided with a limiting column 314, and the elastic member 32 is a spring, the spring is sleeved on the peripheral portion of the limiting column 314, so as to prevent the spring from being separated from the abutting portion 313.

[0060] As shown in FIGS. 1-4, optionally, the shell 1 comprises a left shell 11 and a right shell 12, 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 by screws, and the driver 2 is detachably mounted on the side of the right shell 12 away from the left shell 11.

[0061] Optionally, the mounting space 121 is arranged on the right shell 12, the middle of the mounting space 121 is provided with a first through hole 122, the rotation groove 1211 and the mounting groove 1212 are arranged around the peripheral portion 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, the right shell 12 is further provided with a second through hole 126, the threaded fastener 4 is threadedly connected to the driver 2 after passing through the second through hole 126 from the side of the right shell 12 facing the left shell 11, the driver 2 covers the mounting space 121, the first through hole 122, the second through hole 126 and the brake device 3 together, which can ensure the appearance, and at the same time, can prevent the brake device 3 and the threaded fastener 4 for fixing the driver 2 from being exposed, so as to ensure the service life of the brake device 3 and the threaded fastener 4 and avoid dust and impurities from falling on the brake device 3.

[0062] Optionally, the groove bottom of the mounting groove 1212 is provided with a third through hole 123, the third through hole 123 communicates the interior of the shell 1 and the mounting groove 1212, and the third through hole 123 is aligned with the limiting table 124 in the axial direction, and the third through hole 123 is used as a demolding opening.

[0063] As shown in the examples, when the brake device 3 is installed in the installation space 121, the elastic member 32 is first sleeved on the circumferential portion 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 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 has a guiding and compressing effect on the elastic member 32. The elastic member 32 is continuously compressed, and when the rotating portion 311 is completely embedded in the rotating groove 1211, the abutting portion 313 and the elastic member 32 are also completely installed in the installation groove 1212. The operator releases the brake member 31, and due to the force of the elastic member 32, the abutting portion 313 is pushed against the side wall of the installation groove 1212. The abutting portion 313 is aligned with the limiting table 124 in the axial direction, and the limiting table 124 can prevent the abutting portion 313 from being separated from the installation groove 1212 in the axial direction.

[0064] Embodiment Two

[0065] As shown in FIGS. 9-16, the present embodiment provides a brake assembly configured to brake a drive output shaft, such as the transmission shaft 21 of embodiment one. The brake assembly includes a brake member 31 and an elastic member 32. The brake member 31 includes a braking portion 312 and an abutting portion 313 disposed on the braking portion 312. The elastic member 32 abuts against the abutting portion 313. The elastic member 32 is configured to drive the braking portion 312 to press against the drive output shaft.

[0066] In FIG. 9, the elastic member 32 is a spring. In FIGS. 10, 13-16, the elastic member 32 is integrally formed with the brake member 31, and the elastic member 32 is a Z-shaped continuous structure. In FIG. 11, the elastic member 32 is integrally formed with the brake member 31, and the elastic member 32 is an O-shaped structure. In FIG. 12, the elastic member 32 is integrally formed with the brake member 31, and the elastic member 32 is a waist recessed structure.

[0067] In the present embodiment, the drive output shaft is subjected to the pressure of the braking portion 312 during the output of power and in the case of maintaining a certain posture.

[0068] The present embodiment simplifies the structure of the brake assembly, reduces the shape and installation requirements of the brake member 31, the shape and installation requirements of the elastic member 32, and the matching precision requirements of the brake member 31 and the elastic member 32.

[0069] The brake assembly of the embodiment is arranged in the accommodating groove of the housing of the driver. The driver is an electric motor, and the furniture product is a smart bed. The output shaft of the driver extends into the accommodating groove. The first end of the elastic member 32 abuts against the inner wall of the accommodating groove, and the second end of the elastic member 32 abuts against the abutting portion 313, thereby providing elastic supporting force for the brake portion 312. The brake member 31 always exerts pressure on the peripheral portion of the output shaft of the driver under the elastic supporting force of the elastic member 32. When the driver controls the bed board of the smart bed to be raised, the output shaft of the driver rotates in the forward direction and transmits power to the transmission device such as a round aluminum pipe. The transmission device is elongated and drives the bed board of the smart bed to be raised. At this time, the bed board is heavy, and thus a large counterforce is applied to the transmission device to force the transmission device to be shortened. The transmission device forces the output shaft of the driver to rotate in the reverse direction. Since the brake portion 312 always exerts pressure on the peripheral portion of the output shaft of the driver, the brake portion 312 can prevent the output shaft of the driver from rotating in the reverse direction, thereby causing the transmission device to maintain the current length and preventing the transmission device from being shortened, and causing the bed board to maintain the current raised height and preventing the bed board from being lowered. When the driver controls the bed board of the smart bed to be lowered, the output shaft of the driver rotates in the reverse direction and transmits power to the transmission device. The transmission device is shortened and drives the bed board of the smart bed to be lowered. At this time, the bed board is heavy, and thus a large counterforce is applied to the transmission device to force the transmission device to accelerate the shortening process. Since the brake portion 312 always exerts pressure on the peripheral portion of the output shaft of the driver, the brake portion 312 can prevent the output shaft of the driver from suddenly accelerating the reverse rotation at a certain moment, thereby preventing the lowering speed of the bed board from suddenly becoming fast or even out of control.

[0070] Optionally, the brake assembly further comprises a rotating portion 311, which is arranged on the brake portion 312, and the brake member 31 rotates around the rotating portion 311 as the rotation center. In the embodiment, the brake member 31 is rotatably arranged in the accommodating groove on the housing of the driver. The accommodating groove is provided with a mounting groove, and the rotating portion 311 is rotatably arranged in the mounting groove, thereby preventing the brake member 31 from being stuck.

[0071] In some other embodiments, the brake portion 312 is provided with abutting portions 313 at two ends, respectively. Each abutting portion 313 is abutted by an elastic member 32. The two elastic members 32 jointly exert a pushing force on the brake member 31, so that the brake portion 312 is pressed toward the output shaft of the driver in the radial direction.

[0072] Optionally, the brake portion 312 comprises a brake arc surface 3121 extending along the circumference of the output shaft of the driver, a first end surface 3122 extending toward the rotating portion 311, and a second end surface 3123 extending toward the abutting portion 313. The brake arc surface 3121 has a large area, which can ensure that the brake portion 312 is in surface contact with the output shaft of the driver, thereby improving the braking effect. The transition positions between the rotating portion 311 and the first end surface 3122 and between the abutting portion 313 and the second end surface 3123 are relatively thick, which can prevent the transition positions from being broken under a large force.

[0073] Optionally, the angle corresponding to the braking camber surface 3121 is 90° to 270°. In the embodiment, the angle corresponding to the braking camber surface 3121 is 180°, and the braking part 312 is a semicircular arc structure, which can save materials and reduce costs while ensuring the braking effect. In some other embodiments, the angle corresponding to the braking camber surface 3121 is 90°, which can further save materials, but the area of the braking camber surface 3121 is reduced, and the braking effect is reduced, or the angle corresponding to the braking camber surface 3121 is 270°, which increases the use of materials, but the area of the braking part 312 is increased, and the braking effect is improved.

[0074] Optionally, the braking camber surface 3121 is provided with an elastic enhancement part 3125. The elastic enhancement part 3125 is in abutment with the output shaft of the driver. In the embodiment, the elastic enhancement part 3125 is a notch on the braking camber surface 3121, and the notch extends along the radial direction of the braking camber surface 3121. Since the volume of the brake 31 is small, after the notch is opened on the braking camber surface 3121 of the braking part 312, when the output shaft of the driver rotates, the braking camber surface 3121 is more easily elastically deformed when it is in abutment with the output shaft of the driver, and the notch will deform when it is in abutment with the output shaft of the driver, and the contact area when the elastic enhancement part 3125 is in abutment with the output shaft of the driver will be larger than that when the flat braking camber surface 3121 is in abutment with the output shaft of the driver, and the braking effect is better. The surface of the braking camber surface 3121 is coated with lubricating oil, and the lubricating oil has viscosity, and the thicker the oil film, the stronger the protection of the friction surface. When the braking camber surface 3121 brakes the output shaft of the driver, the lubricating oil can reduce the wear between the braking part 312 and the output shaft of the driver, and the lubricating oil has a certain viscosity, which can maintain the braking effect. The notch on the braking camber surface 3121 can store more lubricating oil than the flat braking camber surface 3121, which prolongs the service life of the braking assembly.

[0075] In some other embodiments, the notch extends in a direction at an angle to the axial direction of the braking camber surface 3121, or the notch extends in an "S" shape, a "W" shape, an "X" shape, etc. on the braking camber surface 3121.

[0076] In some other embodiments, the elastic enhancement part 3125 can be a groove recessed inward on the surface of the braking camber surface 3121, and the groove can be one or more.

[0077] As shown in FIG. 15, optionally, the abutting portion 313 comprises a first abutting portion 313a and a second abutting portion 313b, and the elastic member 32 comprises a first elastic member 32a and a second elastic member 32b, the first elastic member 32a abuts the first abutting portion 313a, the second elastic member 32b abuts the second abutting portion 313b, a first extension surface of the first abutting portion 313a extending away from the first elastic member 32a is disposed at a third included angle a3 with the second end surface 3123, and a second extension surface of the second abutting portion 313b extending away from the second elastic member 32b is disposed at a second included angle a2 with the second end surface 3123.

[0078] In some embodiments, the third included angle a3 and the second included angle a2 can be set according to actual needs.

[0079] In the present embodiment, the abutting portion 313 is one, the central axis of the rotating portion 311, the arc center of the braking portion 312, and the extension surface of the abutting portion 313 away from the elastic member 32 are all located on the same extension plane.

[0080] In some other embodiments, the abutting portion 313 is two or more, of which the two abutting portions 313 are the first abutting portion 313a and the second abutting portion 313b, and the elastic member 32 is two or more, of which the two elastic members 32 are the first elastic member 32a and the second elastic member 32b. Using multiple elastic members 32 to exert greater thrust on the braking member 31 can improve the braking effect.

[0081] Optionally, the rotating portion 311 is a rotary body structure, and the braking member 31 rotates around the rotary center line of the rotating portion 311. In the present embodiment, the rotating portion 311 is a cylindrical structure. In some other embodiments, the rotating portion 311 is a spherical structure. The rotating portion 311 is disposed in the mounting groove, and the braking portion 312 rotates around the rotary center line of the rotating portion 311 and forms a brake on the output shaft of the driver.

[0082] Optionally, the rotary center line of the rotating portion 311 and the second end surface 3123 are located on the same extension plane.

[0083] As shown in FIG. 9, optionally, the abutting portion 313 is provided with a containing groove, the elastic member 32 is a spring, and the elastic member 32 is at least partially inserted into the containing groove to prevent the elastic member 32 from separating from the abutting portion 313.

[0084] As shown in FIGS. 10-16, optionally, the elastic member 32 extends outwardly from the surface of the abutting portion 313, the elastic member 32 is integrally arranged with the abutting portion 313, and both are made of plastic material. The elastic member 32 abuts against the abutting portion 313, and the end of the elastic member 32 extending outwardly abuts against the inner wall of the accommodating groove, thereby providing elastic supporting force for the brake portion 312. The brake member 31 always exerts pressure on the peripheral portion of the output shaft of the driver under the elastic supporting force of the elastic member 32.

[0085] In some embodiments, the present embodiments also provide an electrically driven actuator, which comprises a driver, a housing (corresponding to the housing 1 in Embodiment I), a transmission device (such as the circular aluminum pipe in Embodiment I), and the brake assembly in any embodiment of the present application. The transmission device is arranged inside the housing, the driver output shaft (corresponding to the transmission shaft 21 in Embodiment I) of the driver passes through the housing and extends into the inside of the housing, and the brake assembly is installed outside the housing and located at one side of the driver output shaft.

Claims

1. An electrically driven actuator, comprising: a housing (1) provided with a mounting space (121); a driver (2) mounted on the housing (1), the driver (2) comprising a transmission shaft (21) extending into the mounting space (121); a braking device (3) arranged in the mounting space (121), the braking device (3) comprising a braking member (31) and an elastic member (32), the braking member (31) comprising a braking portion (312) facing the transmission shaft (21) in a radial direction and an abutting portion (313) connected to the braking portion (312), and the elastic member (32) abutting between an inner wall of the mounting space (121) and the abutting portion (313) to drive the braking portion (312) to brake the transmission shaft (21).

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

3. The electrically driven actuator of claim 2, wherein, 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 on the same extension plane.

4. The electrically driven actuator of claim 2, wherein, The mounting space (121) comprises a rotating groove (1211) and a mounting groove (1212), the rotating portion (311) is rotatably embedded in the rotating groove (1211), and the abutting portion (313) and the elastic member (32) are located in the mounting groove (1212), and the elastic member (32) abuts between a wall of the mounting groove (1212) and the abutting portion (313).

5. The electrically driven actuator of claim 4, wherein, One side of a slot of the mounting groove (1212) is provided with a limiting table (124) opposite to the abutting portion (313) in an axial direction, and the limiting table (124) is arranged to limit the abutting portion (313) from being separated from the mounting groove (1212) in the axial direction.

6. The electrically driven actuator of claim 4, wherein, The other side of the slot of the mounting groove (1212) is provided with an inclined surface (125) arranged to guide the elastic member (32) to slide into the mounting groove (1212).

7. The electrically driven actuator of claim 4, wherein, An inner wall of the rotating groove (1211) extends outwardly to form a limiting portion (1213) arranged to limit the rotation space of the rotating portion (311).

8. The electrically driven actuator of claim 3, wherein, The braking arc surface (3121) is provided with an elastic reinforcing portion (3125) facing the transmission shaft (21).

9. The electrically driven actuator of claim 3, wherein, The abutting portion (313) comprises a first abutting portion (313a) and a second abutting portion (313b), the elastic member (32) comprises a first elastic member (32a) and a second elastic member (32b), the first elastic member (32a) abuts against the first abutting portion (313a), the second elastic member (32b) abuts against the second abutting portion (313b), a first extension surface of the first abutting portion (313a) extending away from the first elastic member (32a) is arranged at a first included angle with the first end surface (3122), and a second extension surface of the second abutting portion (313b) extending away from the second elastic member (32b) is arranged at a second included angle with the second end surface (3123).

10. The electrically driven actuator of claim 1, wherein, The brake portion (312) is provided with an arc-shaped groove (3124) on one side of the brake portion (312) in the axial direction, and a snap spring is sleeved on the transmission shaft (21), the snap spring is arranged to limit the transmission shaft (21), and the arc-shaped groove (3124) is arranged to avoid the snap spring.

11. A brake assembly arranged to brake a drive output shaft, comprising: a brake member (31), the brake member (31) comprising a brake portion (312) and an abutting portion (313), the abutting portion (313) being arranged on the brake portion (312); an elastic member (32) abutting against the abutting portion (313); wherein the elastic member (32) is arranged to drive the brake portion (312) to press and brake the drive output shaft.

12. The brake assembly according to claim 11, further comprising a rotating portion (311) arranged on the brake portion (312), and the brake member (31) is arranged to rotate around the rotating portion (311) as a rotating center.

13. The brake assembly of claim 12, wherein, The brake portion (312) comprises a brake arc surface (3121) extending around the drive output shaft, a first end surface (3122) extending towards the rotating portion (311), and a second end surface (3123) extending towards the abutting portion (313).

14. The brake assembly of claim 13, wherein, The brake arc surface (3121) corresponds to an angle of 90° to 270°.

15. The brake assembly of claim 13, wherein, The brake arc surface (3121) is provided with an elastic reinforcing portion (3125).

16. The brake assembly of claim 13, wherein, The abutting portion (313) comprises a first abutting portion (313a) and a second abutting portion (313b), the elastic member (32) comprises a first elastic member (32a) and a second elastic member (32b), the first elastic member (32a) abuts against the first abutting portion (313a), the second elastic member (32b) abuts against the second abutting portion (313b), a first extension surface of the first abutting portion (313a) extending away from the first elastic member (32a) is arranged at a third included angle with the second end surface (3123), and a second extension surface of the second abutting portion (313b) extending away from the second elastic member (32b) is arranged at a second included angle with the second end surface (3123).

17. The brake assembly of claim 13, wherein, The rotating portion (311) is a rotary body structure, and the brake member (31) is arranged to rotate around a rotary center line of the rotating portion (311) as a rotary center line.

18. The brake assembly of claim 17, wherein, The rotation center line of the rotating part (311) and the second end surface (3123) are located on the same extension plane.

19. The brake assembly of claim 11, wherein, The abutting part (313) is provided with a containing groove, and the elastic member (32) is at least partially inserted into the containing groove.

20. The brake assembly of claim 19, wherein, The elastic member (32) extends outward from the surface of the abutting part (313).

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