Electromechanical actuator

Abstract

The invention relates to an electromechanical actuator. The electromechanical actuator comprises a cylinder barrel, a driving mechanism, an emergency unlocking mechanism and a piston, wherein the cylinder barrel is provided with a containing cavity, an air inlet and an air outlet; the emergency unlocking mechanism comprises a transition sleeve and a locking assembly, the transition sleeve is fixedly arranged at the output end of the driving mechanism, and the locking assembly has a locking state in transmission connection with the transition sleeve and an unlocking state in which the locking assembly can move relative to the transition sleeve; the piston is arranged in the containing cavity and divides the containing cavity into a first sub-cavity communicated with the air inlet and a second sub-cavity communicated with the air outlet, the piston is fixedly arranged on the locking assembly, and the driving mechanism is used for driving the piston to move in the first direction so as to be switched between the first position and the second position; when the piston is located at the second position, the high-pressure medium is introduced into the first sub-cavity through the air inlet so that the locking assembly can be switched to the unlocking state and the piston can be pushed to move in the first direction so as to be switched to the first position. The electromechanical actuator is provided with redundancy on the mechanical level, and the failure risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of aviation technology, and in particular to an electromechanical actuator. Background Technology

[0002] As aviation technology continues to evolve towards "more electrification" and "all electrification," electromechanical actuators, as key components replacing traditional hydraulic actuation systems, have been widely used in aircraft nose landing gear retraction systems. An electromechanical actuator includes a drive motor, reducer, lead screw transmission assembly, and corresponding control unit. Electromechanical actuators can convert electrical energy into mechanical energy, achieving precise linear displacement output.

[0003] Electromechanical actuators used in aircraft landing gear retraction and extension require high safety and reliability, necessitating a safety margin for landing gear deployment. Existing technologies employ two approaches: one involves incorporating two independent motors and control units within the actuator, achieving complete electrical redundancy; the other integrates two independent stator windings and corresponding drive circuits within a single motor structure, resulting in a more compact actuator design. Both approaches effectively address common electrical faults, such as motor winding failure, power electronic device malfunction, or abnormal control signals.

[0004] However, in electromechanical actuators, the reducer and lead screw drive assembly still maintain a single redundancy state. When the reducer or lead screw drive assembly experiences mechanical jamming under extreme working conditions, no matter how perfect the redundancy configuration is at the electrical level of the electromechanical actuator, the function of the electromechanical actuator will be completely lost, leading to the extreme risk that the landing gear will not be able to be lowered at critical moments. Summary of the Invention

[0005] Therefore, it is necessary to provide an electromechanical actuator to address the problem of electromechanical actuators failing to function properly when mechanical jamming occurs.

[0006] An electromechanical actuator, comprising:

[0007] A cylinder has a accommodating cavity, and an air inlet and an air outlet are provided on the cylinder, both of which are connected to the accommodating cavity;

[0008] A drive mechanism is connected to the cylinder, and the output end of the drive mechanism is disposed within the accommodating cavity;

[0009] An emergency unlocking mechanism includes a transition sleeve and a locking component. The transition sleeve is fixedly disposed at the output end of the drive mechanism. The locking component has a switchable locked state and an unlocked state. In the locked state, the locking component is connected to the transition sleeve in a transmission manner. In the unlocked state, the locking component and the transition sleeve can move relative to each other.

[0010] A piston is disposed within the accommodating cavity, dividing the accommodating cavity into a first sub-chamber and a second sub-chamber. The first sub-chamber communicates with the air inlet, and the second sub-chamber communicates with the air outlet. The piston is fixedly disposed on the locking assembly, and in the locked state, the piston is connected to the driving mechanism via the emergency unlocking mechanism. The driving mechanism is used to drive the piston to move along a first direction to switch between a first position received within the accommodating cavity and a second position extended out of the accommodating cavity.

[0011] When the piston is in the second position, a high-pressure medium is introduced into the first sub-chamber through the air inlet. The high-pressure medium is used to switch the locking component to the unlocked state and to push the piston to move along the first direction to switch to the first position.

[0012] In one embodiment, the locking component includes:

[0013] A sliding sleeve is fitted around the outer periphery of the transition sleeve, and the piston is fixedly mounted on the sliding sleeve;

[0014] The sliding sleeve has a receiving hole, and the locking tongue is slidably received in the receiving hole along the radial direction of the sliding sleeve. The outer periphery of the transition sleeve has a locking groove, and when the locking assembly is in the locked state, the locking tongue is engaged in the locking groove.

[0015] The locking member, when the locking assembly is in the locked state, at least a portion of the locking member abuts against the bolt to restrict the bolt from moving radially out of the locking groove along the sliding sleeve;

[0016] A pusher is disposed on one side of the locking member along the first direction. After the high-pressure medium is introduced into the first sub-chamber through the air inlet, the high-pressure medium pushes the pusher toward the locking member to push the locking member to slide along the first direction to avoid the receiving hole. The high-pressure medium pushes the piston to slide along the first direction to drive the locking tongue to move radially along the sliding sleeve and disengage from the locking groove, thereby switching the locking assembly to the unlocked state.

[0017] In one embodiment, the bottom of the locking groove has an arc-shaped cross-section along the first direction, and the side of the locking tongue facing the locking groove abuts against the bottom of the locking groove.

[0018] In one embodiment, the latch is provided with a limiting portion, which is used to limit the extreme position of the latch moving radially downward along the slide sleeve.

[0019] In one embodiment, the locking member includes an abutting portion and a clearance portion distributed along the first direction. Along the radial direction of the sliding sleeve, the abutting portion abuts against the outer periphery of the sliding sleeve, and the clearance portion is spaced apart from the outer periphery of the sliding sleeve. When the locking component is in the locked state, the abutting portion presses against the top of the latch. When the locking member is in the unlocked state, the clearance portion is located above the latch.

[0020] In one embodiment, the locking component further includes:

[0021] A first reset member extends along the first direction and is used to drive the locking member to move toward the pushing member to reset.

[0022] In one embodiment, the locking component further includes:

[0023] A first limiting member is disposed on the sliding sleeve and located on the side of the locking member away from the first resetting member. The first limiting member is used to limit the extreme position of the locking member's movement toward the pushing member.

[0024] In one embodiment, the piston has a first cavity and a second cavity distributed along a first direction, and a through groove is also provided on the piston, the through groove connecting the first cavity and the second cavity, the locking component is located in the first cavity, the pusher is disposed in the second cavity, and the pusher slides through the through groove.

[0025] In one embodiment, the locking component further includes:

[0026] A second reset member is disposed within the second cavity. The second reset member extends along the first direction and is used to drive the push member to move away from the locking member to reset.

[0027] In one embodiment, the sliding sleeve is provided with a limiting protrusion, which is used to limit the extreme position of the transition sleeve along the first direction. When the transition sleeve abuts against the limiting protrusion, the locking groove is directly opposite the locking tongue.

[0028] The aforementioned electromechanical actuator, by incorporating an emergency unlocking mechanism and featuring inlet and outlet ports in the cylinder, can unlock the connection between the piston and the drive mechanism via a high-pressure medium when mechanical jamming occurs. This creates an independent pneumatic actuation path, allowing the piston to retract in an emergency, preventing it from failing to retract due to mechanical jamming in the drive mechanism. When this electromechanical actuator is applied to the nose landing gear retraction system of an aircraft, it can complete the landing gear lowering action in emergency situations. The emergency unlocking mechanism provides a mechanical safety margin for the actuator, reducing the risk of malfunction at critical moments. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an electromechanical actuator provided in an embodiment of the present invention.

[0030] Figure 2 This is a cross-sectional view of the piston of an electromechanical actuator provided in an embodiment of the present invention in a first position.

[0031] Figure 3 This is a cross-sectional view of the piston of an electromechanical actuator provided in an embodiment of the present invention in a second position.

[0032] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0033] Figure 5 This is provided as an embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of a sliding sleeve and a locking tongue provided in an embodiment of the present invention.

[0035] Figure 7 This is a schematic diagram of the locking tongue provided in an embodiment of the present invention.

[0036] The above figures include the following reference numerals:

[0037] 1. Cylinder; 11. Receiving cavity; 111. First sub-chamber; 112. Second sub-chamber; 12. Air inlet; 13. Air outlet;

[0038] 2. Drive mechanism; 21. Motor; 22. Reducer; 23. Lead screw transmission assembly; 231. Lead screw; 232. Nut;

[0039] 3. Emergency unlocking mechanism; 31. Transition sleeve; 311. Locking groove; 32. Locking component; 321. Sliding sleeve; 3211. Accommodating hole; 3212. Limiting groove; 3213. Limiting protrusion; 3214. Accommodating groove; 322. Locking tongue; 3221. Limiting part; 323. Locking component; 324. Pushing component; 325. First reset component; 326. First limiting component; 327. Second reset component; 328. Second limiting component;

[0040] 4. Piston; 41. Rod; 42. First cavity; 43. Second cavity; 44. Through groove. Detailed Implementation

[0041] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0047] Electromechanical actuators used in aircraft landing gear have high requirements for safety and reliability, necessitating a safety margin for lowering the landing gear. Currently, electromechanical actuators typically feature dual redundancy at the electrical level, while the reducer and lead screw drive assembly remain in a single redundancy state. When the reducer or lead screw drive assembly experiences mechanical jamming under extreme operating conditions, the electromechanical actuator will completely lose its function, leading to the extreme risk that the landing gear will be unable to lower at critical moments.

[0048] To solve the above problems, such as Figures 1-4 As shown, one embodiment of this application provides an electromechanical actuator, which includes a cylinder 1, a drive mechanism 2, an emergency unlocking mechanism 3, and a piston 4. The cylinder 1 has a receiving cavity 11, and an air inlet 12 and an air outlet 13 are provided on the cylinder 1, both of which are connected to the receiving cavity 11. The drive mechanism 2 is connected to the cylinder 1, and the output end of the drive mechanism 2 is disposed in the receiving cavity 11. The emergency unlocking mechanism 3 includes a transition sleeve 31 and a locking component 32. The transition sleeve 31 is fixedly disposed on the output end of the drive mechanism 2. The locking component 32 has a switchable locked state and an unlocked state. In the locked state, the locking component 32 is connected to the transition sleeve 31 in a transmission manner. In the unlocked state, the locking component 32 and the transition sleeve 31 can move relative to each other. The piston 4 is disposed in the receiving cavity 11. Inside the cavity 11, the piston 4 divides the cavity 11 into a first sub-chamber 111 and a second sub-chamber 112. The first sub-chamber 111 is connected to the air inlet 12, and the second sub-chamber 112 is connected to the air outlet 13. The piston 4 is fixedly mounted on the locking assembly 32. In the locked state, the piston 4 is connected to the drive mechanism 2 via the emergency unlocking mechanism 3. The drive mechanism 2 is used to drive the piston 4 to move along the first direction to switch between a first position received in the cavity 11 and a second position extended out of the cavity 11. When the piston 4 is in the second position, a high-pressure medium is introduced into the first sub-chamber 111 through the air inlet 12. The high-pressure medium is used to switch the locking assembly 32 to the unlocked state and to push the piston 4 to move along the first direction to switch to the first position.

[0049] When the electromechanical actuator is working normally, the locking component 32 is in a locked state. At this time, the locking component 32 is connected to the transition piece. Since the piston 4 is fixedly installed on the locking component 32 and the transition piece is fixedly sleeved on the output end of the drive mechanism 2, it can be known that the piston 4 is connected to the output end of the drive mechanism 2. The drive mechanism 2 can drive the piston 4 to slide in the receiving cavity 11 along the first direction, so as to switch between the first position received in the receiving cavity 11 and the second position extended out of the receiving cavity 11, thereby realizing the normal function of the electromechanical actuator and completing the landing gear retraction and extension action.

[0050] It should be noted that when piston 4 switches from the second position to the first position, that is, when piston 4 retracts, it corresponds to the landing gear lowering action; when piston 4 switches from the first position to the second position, that is, when piston 4 extends, it corresponds to the landing gear retraction action.

[0051] When piston 4 is in the second position and needs to switch to the first position, that is, when the landing gear needs to be lowered, the electromechanical actuator is in emergency mode when mechanical jamming occurs in drive mechanism 2. At this time, high-pressure medium is introduced into the first sub-chamber 111 through air inlet 12. At this time, there is a pressure difference between the first sub-chamber 111 and the second sub-chamber 112. Under the action of pressure difference, locking component 32 switches to the unlocked state. At this time, locking component 32 and transition sleeve 31 can move relative to each other. That is, at this time, there is no longer a connection between piston 4 and the output end of drive mechanism 2. Under the action of pressure difference, piston 4 and unlocking component switch from the second position to the first position, piston 4 retracts, and landing gear is lowered normally, completing the emergency lowering action of landing gear.

[0052] The electromechanical actuator of this embodiment, by setting an emergency unlocking mechanism 3 and opening an air inlet 12 and an air outlet 13, can unlock the connection between the piston 4 and the drive mechanism 2 through a high-pressure medium when the drive mechanism 2 is mechanically jammed, forming an independent pneumatic actuation path. The piston 4 is pushed by the high-pressure medium for emergency retraction, preventing the piston 4 from being unable to retract due to mechanical jamming of the drive mechanism 2. When this electromechanical actuator is applied to the aircraft nose landing gear retraction system, it can complete the landing gear lowering action in emergency situations. By setting redundancy at the mechanical level of the electromechanical actuator through the emergency unlocking mechanism, the risk of functional failure of the electromechanical actuator at critical moments is reduced.

[0053] Specifically, such as Figure 1 , Figure 2As shown, the drive mechanism 2 includes a motor 21, a reducer 22, and a lead screw transmission assembly 23. The lead screw transmission assembly 23 includes a lead screw 231 and a nut 232. The output end of the motor 21 is connected to the reducer 22, which is connected to the cylinder 1. The output end of the reducer 22 extends into the receiving cavity 11. The lead screw 231 is connected to the output end of the reducer 22 and extends along a first direction. The nut 232 is threadedly connected to the lead screw 231. When the motor 21 starts, the power output by the motor 21 is transmitted to the lead screw transmission assembly 23 after being reduced and increased in torque by the reducer 22, driving the lead screw 231 to rotate, thereby driving the nut 232 to move along the first direction. It can be understood that the nut 232 is the output end of the drive mechanism 2. When the locking assembly 32 is in the locked state, the nut 232 moves along the first direction, thereby driving the piston 4 to move along the first direction. It can be understood that the transition sleeve 31 is fixedly sleeved on the outer periphery of the nut 232.

[0054] Understandably, the first sub-chamber 111 and the second sub-chamber 112 are distributed along the first direction. The piston 4 has a rod 41. The piston 4 moves along the first direction so that the rod 41 extends or retracts into the receiving cavity 11. The rod 41 of the piston 4 is located in the first sub-chamber 111, thereby introducing a high-pressure medium into the first sub-chamber 111 through the air inlet 12, so that the piston 4 moves under the push of the high-pressure medium so that the rod 41 retracts into the receiving cavity 11.

[0055] Specifically, the air inlet 12 is connected to the gas storage cylinder via a two-position three-way valve. The gas storage cylinder is used to provide a high-pressure medium to the first sub-chamber 111. The connecting pipeline between the air inlet 12 and the gas storage cylinder is also equipped with a pressure gauge and a pressure sensor to monitor the pressure in the pipeline.

[0056] Optionally, such as Figures 3-5As shown, the locking assembly 32 includes a sliding sleeve 321, a locking tongue 322, a locking member 323, and a pushing member 324. The sliding sleeve 321 is fitted onto the outer periphery of the transition sleeve 31, and the piston 4 is fixedly mounted on the sliding sleeve 321. The sliding sleeve 321 has a receiving hole 3211, and the locking tongue 322 is slidably received in the receiving hole 3211 along the radial direction of the sliding sleeve 321. The outer periphery of the transition sleeve 31 has a locking groove 311. When the locking assembly 32 is in the locked state, the locking tongue 322 is engaged in the locking groove 311. When the locking assembly 32 is in the locked state, at least part of the locking member 323 presses against the locking tongue 324. Above 22, the locking tongue 322 is restricted from moving radially along the sliding sleeve 321 to disengage from the locking groove 311; the pushing member 324 is disposed on one side of the locking member 323 along the first direction. After high pressure medium is introduced into the first sub-chamber 111 through the air inlet 12, the high pressure medium pushes the pushing member 324 toward the locking member 323 to push the locking member 323 to slide along the first direction to the avoidance receiving hole 3211. The high pressure medium pushes the piston 4 to slide along the first direction to drive the locking tongue 322 to move radially along the sliding sleeve 321 to disengage from the locking groove 311, thereby switching the locking assembly 32 to the unlocked state.

[0057] When the locking assembly 32 is in the locked state, the locking tongue 322 is engaged in the locking groove 311, so that the sliding sleeve 321 and the transition sleeve 31 are connected, that is, the sliding sleeve 321 and the transition sleeve 31 are relatively fixed. The locking member 323 presses against the locking tongue 322 to restrict the movement of the locking tongue 322 along the radial direction of the sliding sleeve 321, prevent the locking tongue 322 from falling out of the locking groove 311, and ensure the stable connection between the sliding sleeve 321 and the transition sleeve 31. At this time, the drive mechanism 2 can normally drive the piston 4 to switch between the first position and the second position.

[0058] When the locking component 32 needs to be unlocked in an emergency, a high-pressure medium is introduced into the first sub-chamber 111 through the air inlet 12. The high-pressure medium pushes the pusher 324 toward the locking component 323, thereby pushing the locking component 323 to slide along the first direction to avoid the receiving hole 3211. At the same time, the high-pressure medium pushes the piston 4 to slide along the first direction. Since the piston 4 is fixedly connected to the sliding sleeve 321, the sliding sleeve 321 also moves accordingly. Since the locking component 323 avoids the receiving hole 3211 at this time, the movement of the sliding sleeve 321 forces the locking tongue 322 to move radially along the sliding sleeve 321 and disengage from the locking groove 311. After the locking tongue 322 disengages from the locking groove 311, the locking component 32 switches to the unlocked state. At this time, the locking component 32 and the transition sleeve 31 can move relative to each other, so the high-pressure medium can directly push the piston 4 to move. Thus, the piston 4 does not need to be driven by the drive mechanism 2. The high-pressure medium pushes the piston 4 to switch from the second position to the first position, completing the retraction of the piston 4 and realizing the emergency function of the electromechanical actuator, forcibly lowering the aircraft landing gear.

[0059] Furthermore, such as Figure 4As shown, the bottom of the locking groove 311 has an arc-shaped cross-section along the first direction, and the side of the locking tongue 322 facing the locking groove 311 abuts against the bottom of the locking groove 311. During the unlocking process, the arc-shaped bottom of the groove provides a smooth guiding surface for the movement of the locking tongue 322, allowing the locking tongue 322 to slide smoothly out of the locking groove 311 along the arc-shaped surface, reducing jamming during the unlocking process, and ensuring that the locking component 32 can quickly and smoothly switch to the unlocked state when emergency unlocking is required. The abutting of the locking tongue 322 against the bottom of the groove allows the locking tongue 322 to be more stably locked in the locking groove 311 under the limiting action of the locking member 323, ensuring the reliability of the locking and ensuring that the piston 4 and the output end of the drive mechanism 2 are relatively fixed when the electromechanical actuator is working normally.

[0060] Optionally, such as Figure 6 , Figure 7 As shown, a limiting part 3221 protrudes from the locking tongue 322, which limits the extreme position of the locking tongue 322 moving radially downward along the sliding sleeve 321. After emergency unlocking, the high-pressure medium pushes the piston 4 and the locking assembly 32 to move in the first direction. At this time, the locking tongue 322 will slide radially downward along the sliding sleeve 321 under the action of gravity. By setting the limiting part 3221, the locking tongue 322 can be prevented from dislodging from the receiving hole 3211.

[0061] Specifically, such as Figure 6 As shown, the sliding sleeve 321 is also provided with a limiting groove 3212, which communicates with the receiving hole 3211. The limiting part 3221 is accommodated in the limiting groove 3212, and the top surface of the limiting part 3221 is not higher than the outer peripheral surface of the sliding sleeve 321. This makes the locking assembly 32 more regular and prevents interference between the limiting part 3221 and the locking member 323.

[0062] Optionally, the locking member 323 includes an abutting portion and a clearance portion distributed along a first direction. Along the radial direction of the sliding sleeve 321, the abutting portion abuts against the outer periphery of the sliding sleeve 321, and the clearance portion is spaced apart from the outer periphery of the sliding sleeve 321. When the locking component 32 is in the locked state, the abutting portion presses against the top of the locking tongue 322. When the locking member 323 is in the unlocked state, the clearance portion is located above the locking tongue 322. When the locking assembly 32 is in the locked state, the abutment part presses against the top of the latch 322. At this time, the abutment part can apply a stable downward pressure to the latch 322, so that the latch 322 is more tightly locked into the locking groove 311, preventing the latch 322 from accidentally dislodging from the locking groove 311 when subjected to vibration or impact, thus improving the reliability and stability of the locking assembly 32 in the locked state. When unlocking is required, the pusher 324 pushes the locking member 323 to move so that the clearance part is located above the latch 322. At this time, the clearance part is spaced apart from the outer periphery of the slide sleeve 321, providing sufficient space for the latch 322 to move radially upward along the slide sleeve 321, so that the latch 322 can smoothly dislodge from the locking groove 311, ensuring that the unlocking process is smooth and unobstructed, and the electromechanical actuator can respond to emergency needs in a timely manner.

[0063] Optionally, such as Figure 4 , Figure 5 As shown, the locking assembly 32 also includes a first reset member 325, which extends along a first direction. The first reset member 325 is used to drive the locking member 323 to move toward the pusher 324 to reset. When the piston 4 switches from the second position to the first position under the push of the high-pressure medium, the high-pressure medium is stopped, and the first reset member 325 drives the locking member 323 to move toward the pusher 324 to reset, so that the locking member 323 presses against the latch 322 again.

[0064] Specifically, the first reset element 325 can be a spring.

[0065] In some alternative embodiments, such as Figure 4 , Figure 6 As shown, the sliding sleeve 321 has a receiving groove 3214 extending along a first direction. The locking member 323 is slidably disposed within the receiving groove 3214. The first reset member 325 is disposed within the receiving groove 3214 and located on the side of the locking member 323 away from the pushing member 324. The first reset member 325 extends along the first direction, with one end connected to or abutting against the groove wall of the receiving groove 3214, and the other end connected to or abutting against the locking member 323. The receiving groove 3214 provides a clear movement track for the locking member 323, ensuring that the locking member 323 can only slide within the receiving groove 3214 along the first direction, avoiding problems such as jamming and collision caused by deviation in the movement direction.

[0066] Optionally, such as Figure 4 , Figure 5As shown, the locking assembly 32 also includes a first limiting member 326. The first limiting member 326 is disposed on the sliding sleeve 321 and located on the side of the locking member 323 away from the first reset member 325. The first limiting member 326 is used to limit the extreme position of the locking member 323 moving toward the pushing member 324. Under the elastic force of the first reset member 325, the locking member 323 will tend to move toward the pushing member 324. By limiting the extreme position of the locking member 323 by the first limiting member 326, the locking member 323 is prevented from moving excessively and dislodging from the sliding sleeve 321, thus ensuring the structural integrity of the locking assembly 32.

[0067] Optionally, such as Figure 4 As shown, the piston 4 has a first cavity 42 and a second cavity 43 distributed along a first direction. A through groove 44 is also provided on the piston 4, connecting the first cavity 42 and the second cavity 43. The locking assembly 32 is located within the first cavity 42, and the pushing member 324 is disposed within the second cavity 43, sliding through the through groove 44. Under the action of the high-pressure medium, the pushing member 324 slides along the through groove 44 towards the first cavity 42. After one end of the pushing member 324 enters the first cavity 42, it interacts with the locking member 323, pushing the locking member 323 to slide. This allows the locking member 323 to avoid the receiving hole 3211, providing conditions for the locking tongue 322 to disengage from the locking groove 311. By setting the locking component 32 and the pusher 324 in the first cavity 42 and the second cavity 43 of the piston 4 respectively, and realizing their interaction through the through groove 44, the internal space of the piston 4 is fully utilized, making the structure of the electromechanical actuator more compact and conducive to the miniaturization of the electromechanical actuator.

[0068] Optionally, such as Figure 4 , Figure 5 As shown, the locking assembly 32 also includes a second reset member 327, which is disposed within the second cavity 43 and extends along a first direction. The second reset member 327 is used to drive the push member 324 to move away from the locking member 323 to reset. When the piston 4 switches from the second position to the first position under the push of the high-pressure medium, the high-pressure medium is stopped, and the second reset member 327 drives the push member 324 to move away from the locking member 323 to reset, so that the push member 324 no longer acts on the locking member 323, ensuring the normal reset of the locking member 323 subsequently.

[0069] Specifically, the second reset element 327 can be a spring.

[0070] In this embodiment, the second reset member 327 is sleeved on the outer periphery of the pusher 324. One end of the second reset member 327 is connected to or abuts against the bottom of the second accommodating cavity 11, and the other end of the second reset member 327 is connected to or abuts against the pusher 324.

[0071] Optionally, such as Figure 4 , Figure 5 As shown, the locking assembly 32 also includes a second limiting member 328. The second limiting member 328 is disposed on the piston 4 and located on the side of the push member 324 away from the second reset member 327. The second limiting member 328 is used to limit the extreme position of the push member 324 away from the locking member 323. Under the elastic force of the second reset member 327, the push member 324 will tend to move away from the locking member 323. By limiting the extreme position of the push member 324 by the second limiting member 328, the push member 324 is prevented from moving excessively and dislodging from the piston 4, thus ensuring the structural integrity of the locking assembly 32.

[0072] Optionally, such as Figure 4 , Figure 6 As shown, the sliding sleeve 321 is provided with a limiting protrusion 3213. The limiting protrusion 3213 is used to limit the extreme position of the transition sleeve 31 moving along the first direction. When the transition sleeve 31 abuts against the limiting protrusion 3213, the locking groove 311 is directly opposite the locking tongue 322.

[0073] After a routine test of this electromechanical actuator, the piston 4 is in the first position, while the output end of the drive mechanism 2 and the transition sleeve 31 are in the state where the piston 4 is in the second position. It is necessary to restore the electromechanical actuator to the normal standby locked state. At this time, high-pressure medium is first introduced to switch the locking component 32 to the unlocked state. Then, the drive mechanism 2 is started so that the output end of the drive mechanism 2 drives the transition sleeve 31 to move until the transition sleeve 31 abuts against the limiting protrusion 3213. At this time, the locking groove 311 is aligned with the locking tongue 322, and the locking tongue 322 is embedded in the locking groove 311. The high-pressure gas supply is stopped, and the locking member 323 is reset under the action of the first reset member 325. The locking member 323 presses against the locking tongue 322 again. This electromechanical actuator requires no mechanical disassembly and can be restored to its normal standby locked state through simple electrical coordination operations. This simplifies the testing process and allows for repeated triggering of emergency states and resets during system verification and routine maintenance without damaging the performance of the electromechanical actuator or adding extra reset time, thus improving the testability and reusability of the electromechanical actuator.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An electromechanical actuator, characterized in that, include: The cylinder (1) has a accommodating cavity (11), and the cylinder (1) is provided with an air inlet (12) and an air outlet (13), and the air inlet (12) and the air outlet (13) are both connected to the accommodating cavity (11); A drive mechanism (2) is connected to the cylinder (1), and the output end of the drive mechanism (2) is disposed in the accommodating cavity (11); The emergency unlocking mechanism (3) includes a transition sleeve (31) and a locking component (32). The transition sleeve (31) is fixedly disposed at the output end of the drive mechanism (2). The locking component (32) has a switchable locked state and an unlocked state. In the locked state, the locking component (32) is connected to the transition sleeve (31) in a transmission connection. In the unlocked state, the locking component (32) and the transition sleeve (31) can move relative to each other. A piston (4) is disposed in the accommodating cavity (11). The piston (4) divides the accommodating cavity (11) into a first sub-chamber (111) and a second sub-chamber (112). The first sub-chamber (111) is connected to the air inlet (12), and the second sub-chamber (112) is connected to the air outlet (13). The piston (4) is fixedly disposed in the locking assembly (32). In the locked state, the piston (4) is connected to the driving mechanism (2) through the emergency unlocking mechanism (3). The driving mechanism (2) is used to drive the piston (4) to move in a first direction to switch between a first position received in the accommodating cavity (11) and a second position extended out of the accommodating cavity (11). When the piston (4) is in the second position, a high-pressure medium is introduced into the first sub-chamber (111) through the air inlet (12). The high-pressure medium is used to switch the locking assembly (32) to the unlocked state and to push the piston (4) to move along the first direction to switch to the first position.

2. The electromechanical actuator according to claim 1, characterized in that, The locking component (32) includes: A sliding sleeve (321) is fitted around the outer periphery of the transition sleeve (31), and the piston (4) is fixedly mounted on the sliding sleeve (321). The locking tongue (322) is provided with a receiving hole (3211) on the sliding sleeve (321). The locking tongue (322) is slidably received in the receiving hole (3211) along the radial direction of the sliding sleeve (321). The outer periphery of the transition sleeve (31) is provided with a locking groove (311). When the locking assembly (32) is in the locked state, the locking tongue (322) is engaged in the locking groove (311). When the locking assembly (32) is in the locked state, at least part of the locking member (323) presses against the bolt (322) to restrict the bolt (322) from moving radially out of the locking groove (311) along the slide sleeve (321); The pusher (324) is disposed on one side of the locking member (323) along the first direction. After the high-pressure medium is introduced into the first sub-chamber (111) through the air inlet (12), the high-pressure medium pushes the pusher (324) toward the locking member (323) to push the locking member (323) to slide along the first direction to avoid the receiving hole (3211). The high-pressure medium pushes the piston (4) to slide along the first direction to drive the locking tongue (322) to move radially along the sliding sleeve (321) to disengage from the locking groove (311), thereby switching the locking assembly (32) to the unlocked state.

3. The electromechanical actuator according to claim 2, characterized in that, The bottom of the locking groove (311) has an arc-shaped cross-section along the first direction, and the side of the locking tongue (322) facing the locking groove (311) fits and abuts against the bottom of the locking groove (311).

4. The electromechanical actuator according to claim 2, characterized in that, The latch (322) is provided with a limiting part (3221), which is used to limit the limit position of the latch (322) moving radially downward along the slide sleeve (321).

5. The electromechanical actuator according to claim 2, characterized in that, The locking member (323) includes an abutting portion and a clearance portion distributed along the first direction. Along the radial direction of the sliding sleeve (321), the abutting portion abuts against the outer periphery of the sliding sleeve (321), and the clearance portion is spaced apart from the outer periphery of the sliding sleeve (321). When the locking component (32) is in the locked state, the abutting portion presses against the upper part of the locking tongue (322). When the locking member (323) is in the unlocked state, the clearance portion is located above the locking tongue (322).

6. The electromechanical actuator according to claim 2, characterized in that, The locking component (32) further includes: A first reset member (325) extends along the first direction and is used to drive the locking member (323) toward the pushing member (324) to reset.

7. The electromechanical actuator according to claim 6, characterized in that, The locking component (32) further includes: The first limiting member (326) is disposed on the sliding sleeve (321) and located on the side of the locking member (323) away from the first resetting member (325). The first limiting member (326) is used to limit the extreme position of the locking member (323) moving toward the pushing member (324).

8. The electromechanical actuator according to claim 2, characterized in that, The piston (4) has a first cavity (42) and a second cavity (43) distributed along a first direction. The piston (4) is also provided with a through groove (44) that connects the first cavity (42) and the second cavity (43). The locking component (32) is located in the first cavity (42), and the pusher (324) is disposed in the second cavity (43) and slides through the through groove (44).

9. The electromechanical actuator according to claim 8, characterized in that, The locking component (32) further includes: The second reset member (327) is disposed in the second cavity (43). The second reset member (327) extends along the first direction and is used to drive the push member (324) to move away from the locking member (323) to reset.

10. The electromechanical actuator according to claim 6, characterized in that, The sliding sleeve (321) is provided with a limiting protrusion (3213), which is used to limit the extreme position of the transition sleeve (31) moving along the first direction. When the transition sleeve (31) abuts against the limiting protrusion (3213), the locking groove (311) is directly opposite the locking tongue (322).

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