Linear actuator with quick release function

Abstract

The utility model discloses a linear actuator with a quick release function. The linear actuator comprises a screw rod; an actuating unit; the clutch is used for keeping or cutting off power transmission between the actuating unit and the screw rod; the releasing assembly is used for driving the clutch to act so as to cut off power transmission between the actuating unit and the lead screw and activate the releasing function of the linear actuator; the releasing assembly comprises a movable rod movably arranged in the radial direction of the lead screw; the flexible rope is connected between the movable rod and the clutch; the rotating seat can rotate around the movable rod within a preset angle range, and one end of the movable rod extends into the rotating seat; the release sliding block is installed in the rotating seat in a sliding mode, the release sliding block and the rotating seat are relatively fixed in the circumferential direction, the release sliding block is provided with a driving inclined face extending in the sliding direction of the release sliding block, the release sliding block is pulled to slide, the driving inclined face is used for converting sliding of the release sliding block into radial driving force to the movable rod, and the movable rod moves under the radial driving force to pull the flexible rope; and the clutch is driven by the flexible rope to act so as to cut off power transmission between the actuating unit and the screw rod.

Description

[Technical Field]

[0001] This utility model relates to the field of linear actuator technology, and in particular to a linear actuator with a rapid release function. [Background Technology]

[0002] Linear actuators, also known as electric linear actuators, are widely used in furniture, medical equipment, solar power generation, emergency exits, and fire doors. Their main structure includes an actuation unit, a clutch, a lead screw, a telescopic assembly, and a release assembly. The clutch maintains or disconnects the power transmission between the actuation unit and the lead screw. The release assembly drives the clutch to disconnect the power transmission between the actuation unit and the lead screw, thus activating the release function of the linear actuator. The working principle of the linear actuator is as follows: Under normal conditions, the clutch maintains the power transmission between the actuation unit and the lead screw, allowing the actuation unit to drive the lead screw to rotate. The telescopic assembly is then driven by the lead screw to perform linear telescopic movement. When the motor malfunctions or a sudden power outage occurs, the lead screw cannot rotate, preventing the telescopic assembly from extending or retracting. In this case, by driving the clutch through the release assembly, the power transmission between the actuation unit and the lead screw is disconnected, activating the release function of the linear actuator. This allows the lead screw to rotate freely without being constrained by the actuation unit, enabling the telescopic assembly to retract and reset.

[0003] Existing release assemblies include a release slider connected to a clutch. The linear actuator also includes a housing for housing the clutch and at least part of the actuation unit. The release slider is slidably mounted on the housing along the axial direction of the lead screw. By pulling the release slider along the axial direction of the lead screw, an axial traction force along the lead screw axis can be applied to it, causing the release slider to slide axially and actuate the clutch, thereby cutting off the power transmission between the actuation unit and the lead screw. Therefore, the existing assembly method of the release slider results in a single force direction for the release slider, forcing the user to pull the release slider only along the axial direction of the lead screw. With limited axial operating space after the linear actuator is installed, the user cannot pull the release slider axially, thus preventing the activation of the quick-release function and affecting the user experience. To avoid affecting user operation, sufficient axial operating space needs to be provided for the installation of the linear actuator, resulting in high installation space requirements. [Utility Model Content]

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a linear actuator with a fast release function. By rotating the rotating seat, the direction of the traction force applied to the release slider can be changed, so that the release component can be activated to activate the release function of the linear actuator. This not only makes it convenient for users to operate, but also reduces the product's requirements for installation space.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] Linear actuators with fast release capability include:

[0007] A lead screw and an actuation unit, wherein the lead screw is driven by the actuation unit to rotate in both forward and reverse directions;

[0008] A clutch is used to maintain or disconnect the power transmission between the actuator and the lead screw.

[0009] Release assembly, which is used to drive the clutch to disconnect the power transmission between the actuator unit and the lead screw, thereby activating the release function of the linear actuator;

[0010] The release component includes:

[0011] The movable rod is arranged radially along the lead screw;

[0012] A flexible rope connects the movable rod and the clutch;

[0013] A rotating seat that can rotate around a movable rod within a predetermined angle range, with one end of the movable rod extending into the rotating seat;

[0014] A release slider is slidably mounted in a rotating seat and fixed circumferentially relative to the rotating seat. The release slider has a driving ramp extending along its sliding direction. The release slider is pulled and slides. The driving ramp is used to convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod is moved by the radial driving force to pull the flexible rope, so as to drive the clutch to actuate through the flexible rope and cut off the power transmission between the actuator and the lead screw.

[0015] When the linear actuator of this invention needs to activate the rapid release function, the release slider and the rotating seat are circumferentially fixed, so they rotate synchronously. The rotating seat can rotate around the axis of the movable rod within a predetermined angle range. Therefore, when the release slider is pulled in one direction and is restricted by space, the sliding direction of the release slider can be changed by driving the rotating seat to rotate a certain angle. This changes the angle between the sliding direction of the release slider and the axis of the lead screw, thereby changing the direction of the traction force applied to the release slider and avoiding the space-restricted direction. In other words, this application can change the traction direction of the release slider by rotating the rotating seat, avoiding the limitation of the traction direction of the release slider in the prior art to a single traction direction parallel to the axis of the lead screw. Furthermore, the larger the predetermined angle range, the larger the range of traction direction changes that can be achieved by rotating the rotating seat. This allows users to apply traction force to the release slider in multiple directions, not only facilitating user operation but also reducing the product's installation space requirements. After the release slider is pulled and slides, the driving inclined plane can convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod moves under the radial driving force and pulls the flexible rope, so as to drive the clutch to act through the flexible rope and cut off the power transmission between the actuator and the lead screw. In addition, since the flexible rope can be flexibly arranged in complex paths, it can adapt to various spatial requirements and has lower requirements for the spatial layout between the movable rod and the clutch, thereby reducing the manufacturing cost of the product.

[0016] In the aforementioned linear actuator with rapid release function, the linear actuator also includes a fixed pulley. One end of the flexible rope is connected to the clutch, and the other end passes over the fixed pulley and is connected to the movable rod. The fixed pulley is used to convert the radial driving force applied by the movable rod to the flexible rope into the axial driving force of the flexible rope on the clutch. Since existing clutches operate by applying axial tension, converting the radial driving force applied by the movable rod to the flexible rope into the axial driving force of the flexible rope on the clutch via the fixed pulley can match existing clutches, thereby reducing the cost of product modification. Secondly, changing the direction of the force without changing its magnitude by using the fixed pulley simplifies the structure and ensures smooth pulling of the flexible rope after changing the direction of the force, avoiding jamming.

[0017] In the aforementioned linear actuator with rapid release function, the linear actuator further includes a fixed shaft, on which the fixed pulley is rotatably mounted. This design allows rolling friction to occur between the flexible rope and the fixed pulley after the flexible rope is pulled, reducing frictional wear on the flexible rope and thus extending its service life.

[0018] In the aforementioned linear actuator with rapid release function, the other end of the flexible rope extends towards the axis of the lead screw after passing over the fixed pulley. The movable rod is driven by a radial driving force to move radially inward and pull the flexible rope, thereby causing the clutch sleeve to actuate and cut off the power transmission between the actuator unit and the lead screw.

[0019] In the aforementioned linear actuator with rapid release function, a wire hole is provided between the fixed pulley and the clutch, and the portion of the flexible rope located between the wire hole and the clutch extends along the axial direction of the lead screw. This design ensures that regardless of how the flexible rope is wound around the fixed pulley, the portion of the flexible rope between the wire hole and the clutch extends along the axial direction of the lead screw, thus reducing the requirements for how the flexible rope is wound around the fixed pulley.

[0020] In the aforementioned linear actuator with rapid release function, the clutch includes a clutch sleeve and a shift fork rotatably sleeved on the outside of the clutch sleeve. The shift fork is connected to a flexible rope, which is used to pull the shift fork to drive the clutch sleeve to move along the axial direction of the lead screw, so as to cut off the power transmission between the actuation unit and the lead screw.

[0021] In the aforementioned linear actuator with rapid release function, the shift fork includes a fork rod connected to a flexible rope and two fork feet connected to the fork rod. The outer periphery of the clutch sleeve is provided with an annular mating part. The fork feet are inserted into the mating part and can rotate relative to each other. The flexible rope pulls the entire shift fork axially through the fork rod, thereby driving the clutch sleeve to move axially.

[0022] In the aforementioned linear actuator with a rapid release function, the linear actuator further includes a fixedly mounted guide seat. The guide seat has a groove extending axially along the lead screw, and the fork is slidably engaged with the groove. This design, by guiding the fork to move along the lead screw axially through the groove, ensures that the clutch sleeve can move along the lead screw axially, thus preventing the clutch sleeve from deviating and jamming during movement, which would prevent the release function from being activated.

[0023] In the aforementioned linear actuator with rapid release function, the shift fork includes an active arm connected to the flexible rope and two driven arms for actuating the clutch sleeve. The shift fork rotates relative to the actuation unit, the flexible rope pulls the active arm to drive the shift fork to rotate, and the two driven arms rotate to drive the clutch sleeve to move axially.

[0024] In the aforementioned linear actuator with rapid release function, the linear actuator also includes an elastic reset element. After the traction on the release slider is released, the elastic reset element drives the clutch to reset, so that the clutch maintains power transmission between the actuation unit and the lead screw. This design allows the clutch to automatically reset via the elastic reset element after the traction on the release slider is released, eliminating the need for manual reset. This improves the user experience, and the design is simple, easy to install and maintain, and reduces cost and complexity.

[0025] In the aforementioned linear actuator with rapid release function, the rotating base can rotate 360° around the movable rod. This design allows for traction of the release slider in various directions within a 360° range, resulting in more traction directions for the release slider and making operation more convenient for the user.

[0026] In the aforementioned linear actuator with rapid release function, the linear actuator further includes a housing for accommodating the clutch and at least part of the actuation unit. The rotating seat is located outside the housing, and the housing has a through hole. One end of the movable rod extends through the through hole into the rotating seat. The rotating seat has a latch that passes through the through hole, and the latch engages with a portion of the housing around the through hole, and the latch and housing are rotatably fitted together. This design achieves both the connection between the rotating seat and the housing via the latch and the rotatable engagement between the rotating seat and the housing, resulting in a simple structure and convenient assembly.

[0027] In the aforementioned linear actuator with rapid release function, a baffle is provided at one end of the movable rod located within the rotating base. The side of the baffle facing the driving inclined surface is a conical or arc-shaped surface. The driving inclined surface acts on the conical or arc-shaped surface to apply a radial driving force to the movable rod. This design allows the release slider to rotate smoothly around the movable rod when the rotating base is rotated, preventing jamming.

[0028] In the aforementioned linear actuator with rapid release function, the release assembly further includes a cable, one end of which extends into the rotating seat and connects to the release slider. The sliding of the release slider is induced by the traction of the cable. This design allows the user to pull the release slider by pulling the cable. Furthermore, the cable's flexibility allows the direction of the traction force applied by the user to the cable to deflect slightly relative to the sliding direction of the release slider, further facilitating user operation.

[0029] In the aforementioned linear actuator with rapid release function, the linear actuator further includes a telescopic assembly, which comprises an outer tube, an inner tube, and a nut threadedly connected to a lead screw. The nut and the inner tube form a connection that is circumferentially and axially relatively fixed. The lead screw also has a limiting member located between the nut and the actuation unit, which is used to stop the nut. With this design, when the nut moves along the axial direction of the lead screw towards the actuation unit, the limiting member can stop the nut, thus limiting the movement of the nut and buffering the impact of the nut, thereby preventing the nut from directly impacting the actuation unit and extending the service life of the actuation unit.

[0030] In the aforementioned linear actuator with rapid release function, the clutch is connected to the lead screw via a coupling. The coupling includes a driving ratchet, a driven ratchet, and a return spring. The driving ratchet rotates synchronously with the clutch. The driven ratchet and the lead screw form a connection that is circumferentially fixed and axially movable. The return spring acts on the driven ratchet to keep it engaged with the driving ratchet. The ratchet teeth of the driving ratchet include a first side extending along the axial direction of the driving ratchet and a second side extending at a predetermined angle relative to the axial direction of the driving ratchet. When the actuation unit drives the lead screw to rotate forward so that the inner tube extends relative to the outer tube, the driving ratchet drives the driven ratchet through the first side to drive the lead screw to rotate forward. With this design, when the actuator unit drives the lead screw to reverse, causing the inner tube of the linear actuator to retract and clamp an object or person, the movement of the nut slows down due to the interference of the foreign object. This means the reverse rotation of the lead screw and driven ratchet slows down. Meanwhile, the driving ratchet continues to reverse at high speed under the drive of the actuator unit. Therefore, the speed difference between the driving and driven ratchet forces the driving ratchet to overcome the friction between its second side and the driven ratchet, disengaging it from the driven ratchet. This disengagement stops power transmission, thus stopping the lead screw from reversing and preventing clamping. Subsequently, the actuator unit stops working, and the foreign object can be manually removed. When removing the object, pulling the inner tube outwards drives the nut, converting the linear motion of the nut into the forward rotation of the lead screw. The forward rotation of the lead screw drives the driven ratchet to rotate forward. Since the driving ratchet is in a stopped state at this time, the forward rotation of the driven ratchet forces it to overcome the friction with the second side and disengage from the driving ratchet. That is, the forward rotation of the driven ratchet is not hindered by the driving ratchet, and the inner tube can be pulled out normally. After the inner tube is pulled out to the end, it stops moving. At this time, the lead screw and the driven ratchet also stop rotating forward. Under the action of the return spring, the driven ratchet resets and maintains engagement with the driving ratchet to achieve self-locking, finally removing the foreign object.

[0031] In the aforementioned linear actuator with rapid release function, a support sleeve is fitted onto the lead screw, rotating synchronously with it. The support sleeve includes a sleeve extending along the axial direction of the lead screw and a shoulder protruding from the outer periphery of the sleeve. The driven ratchet is slidably fitted onto the sleeve and circumferentially fixed relative to the sleeve. The return spring is located between the driven ratchet and the shoulder. This design provides a mounting position for the return spring and the driven ratchet through the support sleeve, facilitating their assembly. Furthermore, the sleeve guides the extension and retraction of the return spring and the sliding of the driven ratchet, preventing the return spring from shifting during extension and retraction.

[0032] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0033] The present invention will be further described below with reference to the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of the linear actuator in Embodiment 1 of this utility model;

[0035] Figure 2 This is a top view of the linear actuator in Embodiment 1 of this utility model;

[0036] Figure 3 for Figure 2 Sectional view of AA;

[0037] Figure 4 for Figure 3 A magnified view of part B in the diagram;

[0038] Figure 5 This is an exploded view of the linear actuator section of the present invention in Embodiment 1.

[0039] Figure 6 This is an assembly diagram of the linear actuator part of the structure in Embodiment 1 of this utility model;

[0040] Figure 7 This is a cross-sectional view of the linear actuator after its release function has been activated in Embodiment 1 of this utility model;

[0041] Figure 8 for Figure 7 A magnified view of part of C;

[0042] Figure 9 This is a schematic diagram of the release component in Embodiment 2 of this utility model.

[0043] Figure label:

[0044] 100. Lead screw; 200. Actuation unit; 210. Motor; 220. Worm gear; 230. Worm; 300. Clutch; 310. Clutch sleeve; 320. Shift fork; 321. Fork lever; 3210. Protrusion; 322. Fork foot; 400. Release assembly; 410. Movable rod; 411. Baffle; 420. Flexible rope; 430. Rotary seat; 431. Base; 4311. Buckle; 440. Release slider; 441. Drive ramp; 442. Clearance groove; 450. Cable; 500. Telescopic assembly; 510 Inner tube; 520 Outer tube; 530 Nut; 600 Housing; 610 Guide seat; 611 Slide groove; 620 Fixed pulley; 630 Fixed shaft; 640 Wire hole; 700 Elastic reset component; 800 Coupling; 810 Driving ratchet; 811 First side; 812 Second side; 820 Driven ratchet; 821 Third side; 822 Fourth side; 830 Return spring; 900 Support sleeve; 910 Sleeve; 920 Shoulder; 1000 Limiting component.

Detailed Implementation Methods

[0045] This utility model provides a linear actuator with a rapid release function, comprising:

[0046] A lead screw and an actuation unit, wherein the lead screw is driven by the actuation unit to rotate in both forward and reverse directions;

[0047] A clutch is used to maintain or disconnect the power transmission between the actuator and the lead screw.

[0048] Release assembly, which is used to drive the clutch to disconnect the power transmission between the actuator unit and the lead screw, thereby activating the release function of the linear actuator;

[0049] The release component includes:

[0050] The movable rod is arranged radially along the lead screw;

[0051] A flexible rope connects the movable rod and the clutch;

[0052] A rotating seat that can rotate around a movable rod within a predetermined angle range, with one end of the movable rod extending into the rotating seat;

[0053] A release slider is slidably mounted in a rotating seat and fixed circumferentially relative to the rotating seat. The release slider has a driving ramp extending along its sliding direction. The release slider is pulled and slides. The driving ramp is used to convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod is moved by the radial driving force to pull the flexible rope, so as to drive the clutch to actuate through the flexible rope and cut off the power transmission between the actuator and the lead screw.

[0054] When the linear actuator of this invention needs to activate the rapid release function, the release slider and the rotating seat are circumferentially fixed, so they rotate synchronously. The rotating seat can rotate around the axis of the movable rod within a predetermined angle range. Therefore, when the release slider is pulled in one direction and is restricted by space, the sliding direction of the release slider can be changed by driving the rotating seat to rotate a certain angle. This changes the angle between the sliding direction of the release slider and the axis of the lead screw, thereby changing the direction of the traction force applied to the release slider and avoiding the space-restricted direction. In other words, this application can change the traction direction of the release slider by rotating the rotating seat, avoiding the limitation of the traction direction of the release slider in the prior art to a single traction direction parallel to the axis of the lead screw. Furthermore, the larger the predetermined angle range, the larger the range of traction direction changes that can be achieved by rotating the rotating seat. This allows users to apply traction force to the release slider in multiple directions, not only facilitating user operation but also reducing the product's installation space requirements. After the release slider is pulled and slides, the driving inclined plane can convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod moves under the radial driving force and pulls the flexible rope, so as to drive the clutch to act through the flexible rope and cut off the power transmission between the actuator and the lead screw. In addition, since the flexible rope can be flexibly arranged in complex paths, it can adapt to various spatial requirements and has lower requirements for the spatial layout between the movable rod and the clutch, thereby reducing the manufacturing cost of the product.

[0055] The technical solutions of the embodiments of this utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this utility model. In addition, it should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., indicating orientation or positional relationship, are only based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device / component must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0056] Example 1

[0057] like Figures 1 to 8As shown, the linear actuator in this embodiment includes a lead screw 100, an actuation unit 200, a clutch 300, a release assembly 400, and a telescopic assembly 500. The clutch 300 is used to maintain or disconnect the power transmission between the actuation unit 200 and the lead screw 100. When the clutch 300 is in the state of maintaining the power transmission between the actuation unit 200 and the lead screw 100, the lead screw 100 can be driven by the actuation unit 200 to rotate in both directions. The telescopic assembly 500 includes an inner tube 510. The outer tube 520 and the nut 530 are provided. The nut 530 is at least partially fixed inside the inner tube 510. In this embodiment, the nut 530 extends into the inner tube 510 and is threadedly connected to the inner tube 510 so that the nut 530 is circumferentially fixed and axially fixed relative to the inner tube 510. The nut 530 is threadedly connected to the lead screw 100. Thus, the rotation of the lead screw 100 can drive the inner tube 510 to move outward relative to the outer tube 520 or retract into the outer tube 520, so that the telescopic component 500 can perform linear telescopic movement.

[0058] In this embodiment, the release assembly 400 is used to drive the clutch 300 to actuate, thereby cutting off the power transmission between the actuator unit 200 and the lead screw 100 and activating the release function of the linear actuator. It includes a movable rod 410, a flexible rope 420, a rotating seat 430, and a release slider 440. The movable rod 410 is movably arranged along the radial direction of the lead screw 100; the flexible rope 420 connects the movable rod 410 and the clutch 300; the rotating seat 430 can rotate within a predetermined angle range around the axis of the movable rod 410, and one end of the movable rod 410 extends into the rotating seat 430. Inside; the release slider 440 is slidably mounted inside the rotating seat 430 and is circumferentially fixed relative to the rotating seat 430. The release slider 440 has a driving ramp 441 extending along its sliding direction. The release slider 440 is pulled and slides. The driving ramp 441 is used to convert the sliding of the release slider 440 into a radial driving force on the movable rod 410. The movable rod 410 is moved by the radial driving force and pulls the flexible rope 420 to drive the clutch 300 to actuate through the flexible rope 420 and cut off the power transmission between the actuation unit 200 and the lead screw 100.

[0059] In this embodiment, when the linear actuator needs to activate the rapid release function, since the release slider 440 and the rotating seat 430 are circumferentially fixed, the release slider 440 and the rotating seat 430 rotate synchronously. The rotating seat 430 can rotate around the axis of the movable rod 410 within a predetermined angle range. Therefore, when the release slider 440 is pulled to slide in one direction and is unable to operate due to space limitations, the sliding direction of the release slider 440 can be changed by driving the rotating seat 430 to rotate by a certain angle. That is, the angle between the sliding direction of the release slider 440 and the axis of the lead screw 100 can be changed, thereby changing the direction of the traction force applied to the release slider 440 and achieving the purpose of avoiding the space-limited direction. In this embodiment, the traction direction of the release slider 440 can be changed by rotating the rotating seat 430, avoiding the limitation of the traction direction of the release slider in the prior art to a single traction direction parallel to the screw axis. Furthermore, the larger the predetermined angle range, the greater the range of traction direction changes for the release slider 440 by rotating the rotating seat 430. This allows users to apply traction force to the release slider 440 in multiple directions, simplifying operation and reducing the product's installation space requirements. After the release slider 440 is pulled and slides, the driving inclined surface 441 converts the sliding of the release slider 440 into a radial driving force on the movable rod 410. The movable rod 410, driven by the radial driving force, pulls the flexible rope 420, which in turn drives the clutch 300 to actuate, cutting off the power transmission between the actuation unit 200 and the screw 100. Moreover, since the flexible rope 420 can be flexibly arranged in complex paths, it can adapt to various spatial requirements, reducing the spatial layout requirements between the movable rod 410 and the clutch 300, thereby lowering the product's manufacturing cost.

[0060] Specifically, in this embodiment, the actuation unit 200 includes a motor 210, a worm gear 220, and a worm 230. The worm 230 is connected to the output shaft of the motor 210 and maintains synchronous rotation. The worm gear 220 is rotatably sleeved on the outside of the lead screw 100 and meshes with the worm 230. The clutch 300 includes a clutch sleeve 310 and a shift fork 320 rotatably sleeved on the outside of the clutch sleeve 310. The clutch sleeve 310 is sleeved on the outside of the lead screw 100 and is drively connected to the lead screw 100 to maintain synchronous rotation. The clutch 300 can move along the axial direction of the lead screw 100. One of the axial end faces of the clutch sleeve 310 and the axial end face of the worm gear 220 is provided with a transmission protrusion extending along the axial direction of the lead screw, and the other is provided with a transmission groove that engages with the transmission protrusion. The shift fork 320 is connected to the flexible rope 420. The flexible rope 420 is used to pull the shift fork 320 to drive the clutch sleeve 310 to move along the axial direction of the lead screw, so that the transmission protrusion disengages from the transmission groove and the clutch 300 cuts off the power transmission between the actuation unit 200 and the lead screw 100.

[0061] In this embodiment, the shift fork 320 includes a fork 321 extending radially along the lead screw and two fork legs 322 connected to and separated from one end of the fork 321. The other end of the fork 321 is connected to one end of the flexible rope 420. The outer periphery of the clutch sleeve 310 is provided with an annular mating part. The fork legs 322 are inserted into the mating part and can rotate relative to it. In this embodiment, the mating part is a groove. At this time, the fork legs 322 are inserted into the groove and can rotate relative to the groove to avoid interfering with the rotation of the clutch sleeve 310. In addition, the insertion and mating of the fork legs 322 with the mating part can make the fork legs 322 move axially along the lead screw and drive the clutch sleeve 310 to move axially synchronously. Thus, when the flexible rope 420 pulls the entire shift fork 320 to move axially, the shift fork 320 can drive the clutch sleeve 310 to move axially along the lead screw, so as to cut off the power transmission between the actuation unit 200 and the lead screw 100.

[0062] It is understood that in other embodiments of this utility model, the mating part can also be a rib. In this case, the fork foot is provided with an arc-shaped slot that mates with the rib. The fork foot can rotate relative to the rib and can also drive the clutch sleeve to move along the screw axis by moving the rib.

[0063] The linear actuator in this embodiment also includes a housing 600, a clutch 300, and at least a portion of the actuation unit 200 housed within the housing 600. A rotating seat 430 is located outside the housing 600. The rotating seat 430 includes a base 431 and a cover (not shown) fitted onto the base 431. The base 431 and the cover cooperate to form a mounting cavity extending radially along the movable rod 410. The release slider 440 is slidably mounted within the mounting cavity. In this way, the release slider 440 can be slidably mounted radially along the movable rod 410 within the rotating seat 430, while ensuring that the release slider 440 and the rotating seat 430 are circumferentially fixed, so as to achieve synchronous rotation of the release slider 440 and the rotating seat 430. The housing 600 is provided with a through hole. One end of the movable rod 410 is located inside the housing 600 and connected to the flexible rope 420. The other end extends radially along the lead screw and passes through the through hole into the rotating seat 430. A baffle 411 is connected to the end of the movable rod 410 located inside the rotating seat 430. In this embodiment, the release slider 440 is provided with a relief groove 442 extending radially along the movable rod and opening downwards. The width of the relief groove 442 is greater than the outer diameter of the movable rod 410 and the outer diameter of the baffle 411. The driving inclined surface 441 is provided on the top surface of the relief groove 442. The driving inclined surface 441 gradually slopes upwards towards the movable rod 410. The highest point of the driving inclined surface 441 is higher than the baffle 411. With this design, when a traction force is applied to the release slider 440 so that the lowest point of the driving inclined surface 441 gradually approaches the baffle 411, the movable rod 410 can be moved radially inwards by the driving inclined surface 441 acting on the baffle 411. After the rotating seat 430 rotates, it can still be ensured that when the release slider 440 is pulled, the movable rod 410 can be driven to move radially inwards by the driving inclined surface 441, thereby realizing multi-directional traction of the release slider 440.

[0064] Preferably, the side of the baffle 411 facing the driving inclined surface 441 is an upwardly convex arc surface, and the driving inclined surface 441 acts on the arc surface to apply a radial driving force to the movable rod 410. With this design, when rotating the rotary seat 430, the release slider 440 can rotate smoothly around the movable rod 410, avoiding jamming.

[0065] It is understood that in other embodiments of this utility model, the side of the baffle facing the driving inclined surface may also be a conical surface.

[0066] In this embodiment, the clutch sleeve 310 is located to the left of the worm gear 220. After the clutch sleeve 310 moves to the left along the axial direction of the lead screw, the transmission protrusion can disengage from the transmission groove, thereby causing the clutch 300 to cut off the power transmission between the actuation unit 200 and the lead screw 100. The movable rod 410 is located inside the housing 600, with one end connected to the flexible rope 420. The housing 600 also has a fixed pulley 620 located between the shift fork 320 and the movable rod 410. The fixed pulley 620 is located to the right of the movable rod 410, and the fork 321 is located to the right of the fixed pulley 620. One end of the flexible rope 420 is connected to the fork 321, and the other end extends to the left and then around the fixed pulley 620 in a direction away from the lead screw 100, before extending towards the axis of the lead screw and connecting with the movable rod 410. 20 is used to convert the radial driving force applied by the movable rod 410 to the flexible rope 420 into the axial driving force of the flexible rope 420 on the clutch 300. That is, when the movable rod 410 is driven by the release slider 440 to move radially inward along the lead screw, it will drive the other end of the flexible rope 420 to move radially inward along the lead screw, thereby pulling the flexible rope 420 and one end of the clutch 300 to the left, so that the clutch 300 moves to the left along the lead screw axis and cuts off the power transmission between the actuation unit 200 and the lead screw 100 (e.g., Figure 8 (As shown). Since existing clutches operate by applying axial tension, the radial driving force applied by the movable rod 410 to the flexible rope 420 is converted into an axial driving force of the flexible rope 420 on the clutch 300 by the fixed pulley 620. This can match existing clutches and reduce the cost of product modification. Secondly, by changing the direction of the force without changing its magnitude, the fixed pulley 620 simplifies the structure and ensures smooth pulling of the flexible rope 420 after changing the direction of the force, avoiding jamming.

[0067] Preferably, a fixed shaft 630 is provided inside the housing 600, and a fixed pulley 620 is rotatably mounted on the fixed shaft 630. This design allows rolling friction to be generated between the flexible rope 420 and the fixed pulley 620 after the flexible rope 420 is pulled, thereby reducing frictional wear on the flexible rope 420 and extending its service life.

[0068] Furthermore, two limiting protrusions are provided between the fixed pulley 620 and the clutch 300, spaced apart radially on the lead screw. A guide hole 640 is formed between the two limiting protrusions, and the portion of the flexible rope 420 located between the guide hole 640 and the clutch 300 extends axially along the lead screw. This design ensures that when the flexible rope 420 is pulled, it applies an axial driving force to the clutch 300.

[0069] To prevent the shift fork 320 from shifting when sliding, a guide seat 610 is fixed inside the housing 600 in this embodiment by screws. The guide seat 610 is composed of two half-housing units joined together. The fixed pulley 620, flexible rope 420, and limiting protrusion are all located inside the guide seat 610. The movable rod 410 is slidably mounted on the guide seat 610 along the radial direction of the lead screw. One end of the fork 321 connected to the flexible rope 420 extends into the guide seat 610. The guide seat 610 is provided with a groove 611 extending along the axial direction of the lead screw. The fork 321 is provided with a protrusion 3210, which is inserted into the groove 611 and slides in cooperation with the groove 611. In this way, the groove 611 guides the fork 321 to move along the axial direction of the lead screw, which can ensure that the clutch sleeve 310 can move along the axial direction of the lead screw, so as to avoid the clutch sleeve 310 from deflecting and getting stuck when moving, thus preventing the release function from being activated.

[0070] In addition, such as Figure 4 , Figure 5 and Figure 8 As shown, the linear actuator in this embodiment also includes an elastic reset member 700, which is a compression spring. The elastic reset member 700 is clamped between the fork 321 and the limiting protrusion. In this way, after the release slider 440 is pulled to move the movable rod 410 radially inward and drive the flexible rope 420 to move to the left, the elastic reset member 700 is compressed and stores energy. After the traction on the release slider 440 is released, the elastic reset member 700 releases energy to drive the shift fork 320 to drive the clutch sleeve 310 to move to the right synchronously, so that the clutch 300 slides back to its original position and maintains the power transmission between the actuator unit 200 and the lead screw 100. That is, after the traction on the release slider 440 is released, the clutch 300 can be automatically reset under the action of the elastic reset member 700 without manual reset. This improves the user experience, and the design is simple, easy to install and maintain, and reduces cost and complexity.

[0071] To further facilitate user operation, the rotating seat 430 in this embodiment can rotate 360° around the movable rod 410, that is, the rotating seat 430 can rotate 360° around the axis of the movable rod 410. This design allows the release slider 440 to be pulled in various directions within a 360° range, resulting in more pulling directions for the release slider 440 and making the user's operation more convenient.

[0072] To enable the rotating base 430 to be assembled with the housing 600 and to rotate 360° relative to the housing 600, the rotating base 430 in this embodiment is provided with a through hole and a snap fastener 4311. The snap fastener 4311 engages with the portion of the housing 600 located around the through hole, and the snap fastener 4311 and the housing 600 are rotatably engaged. This design, while connecting the rotating base 430 to the housing 600 via the snap fastener 4311, also achieves a rotatable engagement between the rotating base 430 and the housing 600, resulting in a simple structure and convenient assembly.

[0073] It is understood that in other embodiments of this utility model, a bearing is provided between the rotating seat and the through hole, so that the rotating seat can also rotate 360° around the movable rod.

[0074] Preferably, the release assembly 400 also includes a flexible cable 450. One end of the cable 450 extends into the rotating seat 430 and is connected to the release slider 440. The other end of the cable 450 is located outside the rotating seat 430. By pulling the other end of the cable 450, the release slider 440 can be pulled. Since the cable 450 has a certain degree of flexibility and can be bent, the direction of the traction force applied by the user to the cable 450 can be deflected at a small angle relative to the sliding direction of the release slider 440, thereby further facilitating user operation. It is understood that in other embodiments of this utility model, the rotating seat can also rotate around the axis of the movable rod at 30°, 60°, 90°, 180°, 270°, 300°, etc. In this case, based on the bearing provided between the rotating seat and the through hole, an arc-shaped limiting groove is provided on one of the housing and the rotating seat, and a limiting rib is provided on the other to be inserted into the limiting groove and slide in the limiting groove. The rotation angle of the rotating seat can be limited by the cooperation of the limiting groove and the limiting rib. For example, when the central angle of the limiting groove is 30°, the rotating seat rotates around the movable rod within a range of 30°.

[0075] Secondly, in this embodiment, the clutch 300 is connected to the lead screw 100 via a coupling 800. The coupling 800 includes a driving ratchet 810, a driven ratchet 820, and a return spring 830. The driving ratchet 810 is integrally formed with the clutch sleeve 310 to maintain synchronous rotation. The driven ratchet 820 and the lead screw 100 form a connection that is circumferentially fixed and axially movable. The return spring 830 acts on the driven ratchet 820 to keep it engaged with the driving ratchet 810. The ratchet teeth of the driving ratchet 810 include a first side surface 811 extending along the axial direction of the driving ratchet and a second side surface 812 extending at a predetermined angle relative to the axial direction of the driving ratchet, that is, the surface of the first side surface 811 is parallel to the driving ratchet. The wheel extends axially, and the surface of the second side 812 extends at an angle of approximately 70 degrees relative to the axial direction of the driving ratchet. The ratchet teeth of the driven ratchet 820 have a third side 821 adapted to the first side 811 and a fourth side 822 adapted to the second side 812. When the actuation unit 200 drives the screw 100 to rotate forward so that the inner tube 510 extends relative to the outer tube 520, the driving ratchet 810 drives the driven ratchet 820 to rotate forward through the first side 811, and the driven ratchet 820 drives the screw 100 to rotate forward synchronously. With this design, when the actuation unit 200 drives the screw 100 to rotate in reverse so that the inner tube 510 retracts and clamps an object or human body, the movement of the nut 530 slows down under the interference of the foreign object. That is, the reverse rotation of the lead screw 100 and the driven ratchet 820 slows down. At this time, the driving ratchet 810 continues to rotate at high speed under the drive of the actuation unit 200. Therefore, the speed difference between the driving ratchet 810 and the driven ratchet 820 will force the driving ratchet 810 to overcome the friction between its second side 812 and the fourth side 822 of the driven ratchet 820 and disengage from the driven ratchet 820. That is, the driving ratchet 810 and the driven ratchet 820 disengage to stop the power transmission, thereby stopping the reverse rotation of the lead screw 100 and achieving anti-pinch. Subsequently, the actuation unit 200 stops working. When the foreign object is removed manually, the inner tube 510 is pulled outward to drive the nut 530. The linear motion of the nut 530 is converted into the forward rotation of the lead screw 100. The forward rotation of lever 100 drives the driven ratchet 820 to rotate forward. Since the driving ratchet 810 is in a stopped state at this time, the forward rotation of the driven ratchet 820 will force it to overcome the friction between the fourth side 822 and the second side 812 and disengage from the driving ratchet 810. That is, the forward rotation of the driven ratchet 820 will not be hindered by the driving ratchet 810, and the inner tube 510 can be pulled out normally. After the inner tube 510 is pulled out to the position, it stops moving. At this time, the lead screw 100 and the driven ratchet 820 also stop rotating forward. Under the action of the return spring 830, the driven ratchet 820 resets and remains engaged with the driving ratchet 810 to achieve self-locking, and finally removes the foreign object. This is because the linear actuator has the function of manually lifting the inner tube to the position and stopping self-locking.

[0076] To facilitate the assembly of the return spring 830, a support sleeve 900 is fitted onto the lead screw 100 in this embodiment. The support sleeve 900 is connected to the lead screw 100 via a non-circular fit to maintain synchronous rotation with the lead screw 100, such as a spline fit or a flat fit. The support sleeve 900 includes a sleeve 910 extending axially along the lead screw 100 and a shoulder 920 protruding from the outer periphery of the sleeve 910. A driven ratchet 820 is slidably fitted onto the sleeve 910, and the driven ratchet 820 and the sleeve 910 are kept circumferentially fixed through a non-circular fit. The return spring 830 is located between the driven ratchet 820 and the shoulder 920. This design allows the support sleeve 900 to provide mounting positions for the return spring 830 and the driven ratchet 820, facilitating their assembly. Furthermore, the sleeve 910 guides the extension and retraction of the return spring 830 and the sliding of the driven ratchet 820, preventing misalignment of the return spring 830 during extension and retraction and axial displacement of the driven ratchet 820 during sliding. This ensures that the driven ratchet 820 can smoothly return to its original position and engage with the driving ratchet 810. It should be noted that the diameter of the clutch sleeve 310 in this embodiment is larger than that of the sleeve 910. Thus, when the release function is activated and the clutch sleeve 310 moves to the right, the sleeve 910 guides the axial movement of the clutch sleeve 310.

[0077] Finally, in this embodiment, the lead screw 100 is also fitted with a limiting member 1000 located between the nut 530 and the actuation unit 200. The limiting member 1000 is a rigid member, axially fixed relative to the lead screw 100 and rotatably engaged with the lead screw 100. The limiting member 1000 is used to stop the nut 530. With this design, when the nut 530 moves along the axial direction of the lead screw 100 towards the actuation unit 200, the limiting member 1000 can stop the nut 530, thus limiting the movement of the nut 530 and buffering the impact of the nut 530, thereby preventing the nut 530 from directly impacting the actuation unit 200, thereby extending the service life of the actuation unit 200.

[0078] It is understood that in other embodiments of this utility model, in order to simplify the structure of the linear actuator, the coupling can be omitted. In this case, the clutch sleeve can be sleeved on the lead screw in a non-circular fit, such as a spline fit or a flat fit, so that the clutch sleeve and the lead screw maintain a connection that is circumferentially fixed and axially movable.

[0079] Example 2

[0080] like Figure 9As shown, compared with Embodiment 1, this embodiment differs in that the driving inclined surface 441 is located on the top surface of the release slider 440, and the driving inclined surface 441 gradually slopes downwards towards the movable rod. The lowest point of the driving inclined surface 441 is located below the baffle 411, and the bottom surface of the baffle 411 has a conical surface. When the release slider 440 is pulled to slide, causing the high point of the driving inclined surface 441 to gradually approach the movable rod 410, the movable rod 410 will be gradually lifted by the driving inclined surface 441 and thus move outwards along the radial direction of the lead screw. The other end of the flexible rope 420 passes around the fixed pulley 620 near the lead screw and extends outward along the radial direction of the lead screw, connecting with the movable rod 410. In this way, when the movable rod 410 is driven by the release slider 440 to move outward along the radial direction of the lead screw, it will drive the other end of the flexible rope 420 to move outward along the radial direction of the lead screw, thereby pulling the flexible rope 420 and one end of the clutch 300 to the left, causing the clutch 300 to move to the left along the axial direction of the lead screw and cut off the power transmission between the actuation unit 200 and the lead screw 100.

[0081] Example 3

[0082] Compared with Embodiment 1, the difference in this embodiment is that when the clutch sleeve moves axially to cut off the power transmission between the actuating unit and the lead screw, the sliding direction is opposite to that in Embodiment 1. That is, the clutch sleeve moves to the right to cut off the power transmission between the actuating unit and the lead screw. Specifically, the installation method of the clutch sleeve in the prior art CN214367368U can be referred to. That is, the worm gear is connected to a synchronously rotating right connecting member, the right connecting member is rotatably sleeved on the lead screw, and the lead screw is also connected to a synchronously rotating left connecting member. The clutch sleeve is sleeved on the right connecting member, and the clutch sleeve and the right connecting member maintain a synchronous rotation and axial relative movement connection. A return spring is provided between the right side of the clutch sleeve and the worm gear. Under normal conditions, the clutch sleeve maintains a transmission connection with the left connecting sleeve under the action of the return spring, so that the power of the actuating unit is transmitted to the lead screw through the right connecting member, the clutch sleeve, and the left connecting member. By driving the clutch to move to the right through the release component, the power transmission between the actuating unit and the lead screw can be cut off, thereby activating the release function.

[0083] In this embodiment, the fixed pulley is located to the right of the clutch, and the movable rod is located to the right of the fixed pulley. The way the flexible rope is wound around the fixed pulley can be set according to the direction of movement of the movable rod after being subjected to radial driving force. For details, please refer to Embodiment 1. Based on Embodiment 1, those skilled in the art can easily deduce how the direction of the flexible rope wound around the fixed pulley is set according to the direction of movement of the movable rod after being subjected to radial driving force, which will not be described in detail here.

[0084] Example 4

[0085] Compared with embodiments one to three, the difference in this embodiment is that the shift fork includes an active arm connected to the flexible rope and two driven arms for actuating the clutch sleeve. The shift fork rotates relative to the actuation unit, and the flexible rope drives the active arm to rotate through the shift fork component, thereby causing the shift fork to rotate. The two driven arms rotate to drive the clutch sleeve to move axially. The shift fork can be configured as described in the prior art CN214367368U, where the shift fork is hinged to the shift fork seat. In this embodiment, the flexible rope is connected to the actuating component in the prior art CN214367368U. Thus, by driving the flexible rope to move to the left along the screw axis, the clutch sleeve can be driven to move axially to the right to cut off the power transmission between the actuation unit and the screw. Alternatively, by driving the flexible rope to move to the right along the screw axis, the clutch sleeve can be driven to move axially to the left to maintain the power transmission between the actuation unit and the screw. This will not be described in detail here.

[0086] It is understood that in other embodiments of this utility model, when the reset spring is located on the side of the clutch sleeve away from the worm gear, the flexible rope can be driven to move to the right along the screw axis, thereby driving the clutch sleeve to move to the left to cut off the transmission connection between the clutch sleeve and the worm gear, and thus cutting off the power transmission between the actuation unit and the screw. The specific implementation scheme can be obtained by those skilled in the art by making simple changes based on Embodiment 4, and will not be described in detail here.

[0087] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A linear actuator with rapid release function, including: A lead screw and an actuation unit, wherein the lead screw is driven by the actuation unit to rotate in both forward and reverse directions; A clutch is used to maintain or disconnect the power transmission between the actuator and the lead screw. Release assembly, which is used to drive the clutch to disconnect the power transmission between the actuator unit and the lead screw, thereby activating the release function of the linear actuator; The release component is characterized in that it comprises: The movable rod is arranged radially along the lead screw; A flexible rope connects the movable rod and the clutch; A rotating seat that can rotate around a movable rod within a predetermined angle range, with one end of the movable rod extending into the rotating seat; A release slider is slidably mounted in a rotating seat and fixed circumferentially relative to the rotating seat. The release slider has a driving ramp extending along its sliding direction. The release slider is pulled and slides. The driving ramp is used to convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod is moved by the radial driving force to pull the flexible rope, so as to drive the clutch to actuate through the flexible rope and cut off the power transmission between the actuator and the lead screw.

2. The linear actuator with rapid release function as described in claim 1, characterized in that, The linear actuator also includes a fixed pulley. One end of the flexible rope is connected to the clutch, and the other end passes over the fixed pulley and is connected to the movable rod. The fixed pulley is used to convert the radial driving force applied by the movable rod to the flexible rope into the axial driving force of the flexible rope on the clutch.

3. The linear actuator with rapid release function as described in claim 2, characterized in that, The linear actuator also includes a fixed shaft, on which the fixed pulley is rotatably mounted.

4. The linear actuator with rapid release function as described in claim 2, characterized in that, The other end of the flexible rope passes over the fixed pulley and extends towards the axis of the lead screw. The movable rod is driven by a radial driving force to move radially inward and pull the flexible rope, thereby causing the clutch sleeve to actuate and cut off the power transmission between the actuation unit and the lead screw.

5. The linear actuator with rapid release function as described in claim 2, characterized in that, A wire hole is provided between the fixed pulley and the clutch, and the portion of the flexible rope located between the wire hole and the clutch extends along the axial direction of the lead screw.

6. The linear actuator with rapid release function as described in claim 1, characterized in that, The clutch includes a clutch sleeve and a shift fork rotatably sleeved on the outside of the clutch sleeve. The shift fork is connected to a flexible rope, which is used to pull the shift fork to drive the clutch sleeve to move along the axial direction of the lead screw, so as to cut off the power transmission between the actuation unit and the lead screw.

7. The linear actuator with rapid release function as described in claim 6, characterized in that, The shift fork includes a fork rod connected to a flexible rope and two fork feet connected to the fork rod. The outer periphery of the clutch sleeve is provided with an annular mating part. The fork feet are inserted into the mating part and can rotate relative to each other. The flexible rope pulls the entire shift fork axially through the fork rod, thereby driving the clutch sleeve axially.

8. The linear actuator with rapid release function as described in claim 7, characterized in that, The linear actuator also includes a fixedly mounted guide seat, on which a groove extending along the axial direction of the lead screw is provided, and the fork is slidably engaged with the groove.

9. The linear actuator with rapid release function as described in claim 6, characterized in that, The shift fork includes an active arm connected to the flexible rope and two driven arms for actuating the clutch sleeve. The shift fork rotates relative to the actuation unit, the flexible rope pulls the active arm to drive the shift fork to rotate, and the two driven arms rotate to drive the clutch sleeve to move axially.

10. The linear actuator with rapid release function as described in claim 1, characterized in that, The linear actuator also includes an elastic reset element, which is used to drive the clutch to reset after the traction on the release slider is released, so that the clutch maintains the power transmission between the actuation unit and the lead screw.

11. The linear actuator with rapid release function as described in claim 1, characterized in that, The rotating base can rotate 360° around the movable rod.

12. The linear actuator with rapid release function as described in claim 11, characterized in that, The linear actuator further includes a housing for housing the clutch and at least part of the actuation unit. The rotary seat is located outside the housing. The housing has a through hole. One end of the movable rod extends through the through hole into the rotary seat. The rotary seat has a buckle that passes through the through hole. The buckle engages with a portion of the housing located around the through hole, and the buckle rotates with the housing.

13. The linear actuator with rapid release function as described in claim 1, characterized in that, The movable rod has a baffle plate at one end inside the rotating seat. The side of the baffle plate facing the driving inclined surface is a conical surface or an arc surface. The driving inclined surface acts on the conical surface or arc surface to apply a radial driving force to the movable rod.

14. The linear actuator with rapid release function as described in claim 1, characterized in that, The release assembly also includes a cable, one end of which extends into the rotating seat and is connected to the release slider, the sliding of which is caused by the traction of the cable.

15. The linear actuator with rapid release function as described in claim 1, characterized in that, The linear actuator also includes a telescopic assembly, which includes an outer tube, an inner tube, and a nut threadedly connected to the lead screw. The nut and the inner tube form a connection that is circumferentially and axially fixed. The lead screw is also provided with a limiting member located between the nut and the actuation unit, which is used to stop the nut.

16. The linear actuator with rapid release function as described in claim 15, characterized in that, The clutch is connected to the lead screw via a coupling. The coupling includes a driving ratchet, a driven ratchet, and a return spring. The driving ratchet rotates synchronously with the clutch. The driven ratchet and the lead screw form a connection that is circumferentially fixed and axially movable. The return spring acts on the driven ratchet to keep it engaged with the driving ratchet. The ratchet teeth of the driving ratchet include a first side extending along the axial direction of the driving ratchet and a second side extending at a predetermined angle relative to the axial direction of the driving ratchet. When the actuation unit drives the lead screw to rotate forward so that the inner tube extends relative to the outer tube, the driving ratchet drives the driven ratchet through the first side to drive the lead screw to rotate forward.

17. The linear actuator with rapid release function as described in claim 16, characterized in that, The lead screw is fitted with a support sleeve that rotates synchronously with it. The support sleeve includes a sleeve extending along the axial direction of the lead screw and a shoulder protruding on the outer periphery of the sleeve. The driven ratchet is slidably fitted on the sleeve and is circumferentially fixed relative to the sleeve. The return spring is located between the driven ratchet and the shoulder.

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