One-way self-locking actuator

Abstract

The invention discloses a one-way self-locking actuator, belongs to the field of actuators, solves the problem of poor self-locking effect of an existing actuator, and adopts the technical scheme that the one-way self-locking actuator comprises a shell, an input shaft arranged in the shell and used for receiving torque and a worm gear used for outputting the torque, and the worm gear is in transmission connection with the input shaft; the input shaft drives the worm gear to rotate so as to drive a load to move linearly, at least one of the worm gear and the input shaft is sleeved with a brake ring, the outer periphery of the brake ring is sleeved with an opening elastic pre-tightening ring, the first end of the opening elastic pre-tightening ring is fixed to the shell, and the second end of the opening elastic pre-tightening ring is in sliding connection with the brake ring. When the worm gear has the tendency to rotate in the reverse direction, the brake ring pushes the opening elastic pre-tightening ring to be folded inwards so as to tightly hold the brake ring to achieve friction self-locking, and when the worm gear has the tendency to rotate in the forward direction, the brake ring pushes the opening elastic pre-tightening ring to expand outwards so as to loosen the brake ring to achieve unlocking. According to the actuator, self-locking can be provided in time, and a good self-locking effect is achieved.

Description

Technical Field

[0001] The invention relates to the field of actuators, in particular to a one-way self-locking actuator. Background Art

[0002] In the prior art, in order to ensure that the lifting system does not fall due to insufficient self-locking force when it stops at any position under load, an additional self-locking structure is usually added. For example, utility model patent CN213585435U discloses a motor and a linear actuator with a torsion spring self-locking mechanism, including a torsion spring arranged on the input shaft, which generates a self-locking force by clamping, and utility model patent CN204089459U discloses a DC reduction motor with a self-locking device for a lifting column, which is provided with a torsion spring and a friction sleeve on the worm gear, and the torsion spring is arranged in the friction sleeve. When the worm gear assembly has a tendency to rotate in the reverse direction, the torsion spring is subjected to the reverse thrust and expands outward, so that its outer wall and the inner wall of the friction sleeve are in friction contact to generate a self-locking force. However, the effective contact area between the torsion spring and the friction sleeve is small, and the deceleration or braking effect that can be achieved is small, and the torsion spring requires the input shaft or the worm gear to rotate a large angle or even multiple turns to clamp, and cannot provide self-locking in time. Summary of the invention

[0003] The purpose to be achieved by the present invention is to provide a one-way self-locking actuator, which solves the problem of poor self-locking effect of existing actuators, provides self-locking in time, and achieves better self-locking effect.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a one-way self-locking actuator, comprising a housing, an input shaft arranged in the housing for receiving torque and a worm wheel for outputting torque, the worm wheel is drivingly connected to the input shaft, the input shaft drives the load to move linearly by driving the worm wheel to rotate, at least one of the worm wheel and the input shaft is sleeved with a brake ring, the outer periphery of the brake ring is sleeved with an open elastic preload ring, the first end of the open elastic preload ring is fixed on the housing, the second end of the open elastic preload ring is slidably connected to the brake ring, when the worm wheel has a tendency to rotate in the reverse direction, the brake ring pushes the open elastic preload ring to retract inward to hold the brake ring tightly and frictionally self-lock, and when the worm wheel has a tendency to rotate forward, the brake ring pushes the open elastic preload ring to expand outward to loosen the brake ring and unlock.

[0005] After adopting the above technical scheme, the present invention has the following advantages: First, the design of the brake ring and the open elastic preload ring, when the worm wheel has a tendency to rotate in the opposite direction, the brake ring pushes the open elastic preload ring inward, and the brake ring and the open elastic preload ring provide a larger contact area, thereby being able to generate a greater friction force under the same clamping force, thereby improving the self-locking effect, which helps to provide a more reliable self-locking force under heavy loads or long periods of stationary conditions; secondly, the design of the open elastic preload ring enables the self-locking mechanism to respond quickly at the moment the worm wheel rotates in the opposite direction. The brake ring pushes the open elastic preload ring inward, immediately generating a self-locking force, thus avoiding the problem in the prior art that the torsion spring needs to be rotated multiple times before it can be tightened, thereby improving the response speed and safety of the system. In addition, due to the uniform deformation of the open elastic preload ring, the friction force is more evenly distributed over the entire contact surface, reducing the risk of local overheating and wear, and extending the service life of the self-locking mechanism. In addition, the brake ring and the open elastic preload ring have a simple structure and are easy to manufacture and maintain. Finally, when the worm gear rotates forward, the brake ring pushes the open elastic preload ring to expand outward, eliminating friction and ensuring that the one-way self-locking actuator operates efficiently in the non-braking direction without being affected by additional resistance.

[0006] Furthermore, the brake ring is provided with an opening, and the second end of the open elastic preload ring is slidably connected in the opening, and the opening extends along the circumferential direction of the brake ring to push the open elastic preload ring to tighten or loosen the brake ring when the brake ring rotates relative to the open elastic preload ring.

[0007] With the above technical solution, since the end of the open elastic preload ring is slidably connected in the opening of the brake ring, a slight rotation of the brake ring can quickly push the open elastic preload ring to hold the brake ring tightly, thus achieving instant self-locking. This avoids the problem that the traditional torsion spring needs to be rotated multiple times to hold tightly.

[0008] Furthermore, the second end of the open elastic preload ring is bent inwardly toward the center of the open elastic preload ring to form a positioning protrusion, and the positioning protrusion extends into the opening to cooperate with the opening.

[0009] By adopting the above-mentioned technical solution, the positioning protrusion extends into the opening of the brake ring, and the brake ring pushes the opening elastic preload ring through the positioning protrusion, thereby increasing the contact points between the opening elastic preload ring and the brake ring, improving the stability of the entire self-locking mechanism, and maintaining a relatively stable self-locking effect under high load or vibration environment.

[0010] Furthermore, the brake ring is arranged on the worm wheel and / or the input shaft, and the positioning protrusion and the worm wheel and / or the input shaft are arranged at intervals.

[0011] By adopting the above technical solution, the positioning protrusion is spaced apart from the worm wheel and / or the input shaft, thereby avoiding direct interference with the worm wheel or the input shaft during the self-locking process, ensuring the smooth operation of the self-locking mechanism, and reducing mechanical wear.

[0012] Furthermore, at least one side of the outer periphery of the brake ring is provided with a limiting rib that abuts against the side wall of the open elastic preload ring, and the limiting rib is located on the axial side of the open elastic preload ring to limit the separation of the open elastic preload ring and the brake ring in the axial direction.

[0013] By adopting the above-mentioned technical solution, the design of the limiting rib effectively prevents the opening elastic preload ring from being separated in the axial direction, thereby ensuring the stability of the self-locking.

[0014] Furthermore, a slot is provided on the inner wall of the shell, and the first end of the open elastic preload ring is bent radially outwardly of the open elastic preload ring to form an insert rib, and the insert rib is inserted into the slot.

[0015] Through the above technical solution, the plug-in design of the plug-in rib and the slot ensures that one end of the open elastic preload ring is firmly fixed on the shell, so that the brake ring can accurately push the open elastic preload ring when rotating, thereby achieving fast and reliable self-locking force or self-locking force release.

[0016] Furthermore, an installation opening connected to the side of the slot is provided on the inner wall of the shell, and the installation opening is used for allowing the first end of the open elastic preload ring to move into or out of the slot, and the installation opening and the limiting rib are located on the same side of the open elastic preload ring.

[0017] Through the above technical solution, the design of the installation opening allows the first end of the open elastic preload ring to be easily moved into or out of the slot, greatly simplifying the installation and maintenance process. The design of the limiting rib and the installation opening on the same side ensures that the open elastic preload ring is firmly fixed in the axial direction. The limiting rib abuts against the side wall of the open elastic preload ring to prevent it from falling out of the slot during operation, thereby improving the stability and reliability of the self-locking structure.

[0018] Furthermore, an escape space is provided between the shell and the open elastic pre-tightening ring to prevent the open elastic pre-tightening ring from expanding outwards.

[0019] Through the above technical solution, the design of the avoidance space ensures that the open elastic preload ring has enough space when it needs to expand outward and will not be hindered by the shell.

[0020] Furthermore, the brake ring is located at the head end or the tail end of the input shaft.

[0021] Through the above technical solution, the installation can be flexibly adjusted according to different application scenarios.

[0022] Furthermore, the brake ring is made of POM material; and the open elastic preload ring is made of manganese steel material.

[0023] Through the above technical solutions, the POM material has high wear resistance and can maintain stable performance under high load and frequent use, reducing the frequency of maintenance and replacement. Manganese steel has extremely high strength and toughness, and can maintain its shape and performance under high load and impact, ensuring that the open elastic preload ring will not deform or break during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Figure 1 Schematic diagram of the structure of a one-way self-locking actuator in Embodiment 1 of the present invention;

[0026] Figure 2 It is a partial structural schematic diagram of a one-way self-locking actuator in Embodiment 1 of the present invention;

[0027] Figure 3 It is a cross-sectional view of the one-way self-locking actuator in the first embodiment of the present invention in the reverse rotation state;

[0028] Figure 4 is a cross-sectional view of the one-way self-locking actuator in the first embodiment of the present invention in the forward rotation;

[0029] Figure 5 is a cross-sectional view from another perspective of the one-way self-locking actuator in the first embodiment of the present invention;

[0030] Figure 6 is a cross-sectional view of a partial structure of the one-way self-locking actuator in Embodiment 1 of the present invention from another viewing angle;

[0031] Figure 7 Schematic diagram of the structure of a one-way self-locking actuator in Embodiment 2 of the present invention;

[0032] Figure 8 is a cross-sectional view of a one-way self-locking actuator in Embodiment 2 of the present invention;

[0033] Fig. 9 is a cross-sectional view of the one-way self-locking actuator in the second embodiment of the present invention from another perspective;

[0034] Fig.10 Schematic diagram of the structure of the one-way self-locking actuator in the third embodiment of the present invention;

[0035] Fig.11 Schematic diagram of the partial structure of the one-way self-locking actuator in the third embodiment of the present invention;

[0036] Fig.12Schematic diagram of the structure of a one-way self-locking actuator in Embodiment 4 of the present invention;

[0037] In the figure, 10, housing; 11, slot; 12, mounting opening; 13, avoidance space; 14, first housing; 141, main body; 142, tail cover; 15, second housing; 16, limiting step; 20, motor shaft; 30, worm; 40, worm wheel; 41, mounting portion; 50, brake ring; 51, opening; 52, limiting rib; 60, opening elastic preload ring; 61, first end; 611, plug-in rib; 62, second end; 621, positioning protrusion; 70, commutator; 71, bearing. DETAILED DESCRIPTION

[0038] The invention discloses a one-way self-locking actuator, comprising a shell, an input shaft arranged in the shell for receiving torque, and a worm wheel for outputting torque. The worm wheel is connected to the input shaft in a transmission manner. The input shaft drives the worm wheel to rotate to drive the load to move linearly. A brake ring is sleeved on at least one of the worm wheel and the input shaft. An open elastic pre-tightening ring is sleeved on the outer periphery of the brake ring. The first end of the open elastic pre-tightening ring is fixed on the shell, and the second end of the open elastic pre-tightening ring is slidably connected to the brake ring. When the worm wheel has a tendency to rotate in the reverse direction, the brake ring pushes the open elastic pre-tightening ring to retract inward to hold the brake ring tightly and frictionally self-lock. When the worm wheel has a tendency to rotate in the forward direction, the brake ring pushes the open elastic pre-tightening ring to expand outward to loosen the brake ring and unlock.

[0039] Firstly, the design of the brake ring and the open elastic preload ring is that when the worm wheel tends to rotate in the opposite direction, the brake ring pushes the open elastic preload ring inward, and the brake ring and the open elastic preload ring provide a larger contact area, thereby generating a greater friction force under the same clamping force, thereby improving the self-locking effect. This helps to provide a more reliable self-locking force under heavy loads or long periods of stationary conditions. Secondly, the design of the open elastic preload ring enables the self-locking mechanism to respond quickly at the moment the worm wheel rotates in the opposite direction. The brake ring pushes the open elastic preload ring inward, immediately generating a self-locking force, thus avoiding the problem in the prior art that the torsion spring needs to be rotated multiple times before it can be tightened, thereby improving the response speed and safety of the system. In addition, due to the uniform deformation of the open elastic preload ring, the friction force is more evenly distributed over the entire contact surface, reducing the risk of local overheating and wear, and extending the service life of the self-locking mechanism. In addition, the brake ring and the open elastic preload ring have a simple structure and are easy to manufacture and maintain. Finally, when the worm gear rotates forward, the brake ring pushes the open elastic preload ring to expand outward, eliminating friction and ensuring that the one-way self-locking actuator operates efficiently in the non-braking direction without being affected by additional resistance.

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein.

[0042] It should be understood that in various embodiments of the present invention, the size of the serial numbers of the processes does not mean the order of execution. The execution order of the processes should be determined by their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0043] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0044] It should be understood that in the present invention, "plurality" refers to two or more than two. "And / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0045] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0046] Embodiment 1:

[0047] like Figures 1 to 6As shown, the present invention provides a one-way self-locking actuator, which is used for receiving an input shaft for torque and a worm wheel 40 for outputting torque. The worm wheel 40 is drivingly connected to the input shaft, and the input shaft drives the load to move linearly by driving the worm wheel 40 to rotate. A brake ring 50 is sleeved on the input shaft, and an open elastic preload ring 60 is sleeved on the outer periphery of the brake ring 50. The first end 61 of the open elastic preload ring 60 is fixed on the housing 10, and the second end 62 of the open elastic preload ring 60 is slidably connected to the brake ring 50. When the worm wheel 40 has a tendency to rotate in the reverse direction, the brake ring 50 pushes the open elastic preload ring 60 to retract inward to hold the brake ring 50 and frictionally self-lock. When the worm wheel 40 has a tendency to rotate in the forward direction, the brake ring 50 pushes the open elastic preload ring 60 to expand outward to loosen the brake ring 50 and unlock it.

[0048] First, the design of the brake ring 50 and the opening elastic preload ring 60 is as follows: Figure 3 As shown, when the worm gear 40 tends to rotate in the opposite direction, the reverse rotation of the worm gear 40 drives the input shaft to rotate in the opposite direction, and the input shaft rotates in the direction of the arrow. The input shaft rotates in the opposite direction and drives the brake ring 50 to push the open elastic preload ring 60 inward. The brake ring 50 and the open elastic preload ring 60 provide a larger contact area, so that a greater friction force can be generated under the same clamping force, thereby improving the self-locking effect. This helps to provide a more reliable self-locking force under heavy loads or long periods of stationary state. Secondly, the design of the open elastic preload ring 60 allows the self-locking mechanism to respond quickly at the moment the worm gear 40 rotates in the opposite direction. The brake ring 50 pushes the open elastic preload ring 60 to close inward, and immediately generates a self-locking force, which avoids the problem that the torsion spring in the prior art needs to be rotated multiple times to be tightened, and improves the response speed and safety of the system. In addition, due to the uniform deformation of the open elastic preload ring 60, the friction force is more evenly distributed on the entire contact surface, reducing the risk of local overheating and wear, and extending the service life of the self-locking mechanism. In addition, the brake ring 50 and the open elastic preload ring 60 have a simple structure and are easy to manufacture and maintain. Finally, Figure 4 As shown, when the worm gear 40 rotates forward, the forward rotation of the worm gear 40 drives the input shaft to rotate forward, and the input shaft rotates in the direction of the arrow. The input shaft rotates forward and drives the brake ring 50 to push the open elastic preload ring 60 to expand outward, eliminating friction and ensuring that the one-way self-locking actuator operates efficiently in the non-braking direction without being affected by additional resistance.

[0049] It should be noted that the brake ring 50 and the input shaft are interference fit after assembly, and the brake ring 50 and the open elastic preload ring 60 are interference fit to achieve circumferential synchronous rotation of the two.

[0050] Among them, the one-way self-locking actuator also includes a rotor, a stator, a commutator 70 and a bearing 71, the input shaft includes a motor shaft 20 and a worm 30, the motor shaft 20 and the worm 30 are fixedly connected, the worm 30 and the worm wheel 40 are meshed, the housing 10 includes a first housing 14 for installing the rotor, the stator, and the commutator 70 and a second housing 15 for installing the worm wheel 40 and the worm 30, the head end of the motor shaft 20 passes through the first housing 14 and passes through the second housing 15 and is fixedly connected to the worm 30, the middle and rear part of the motor shaft 20 is located in the first housing 14, the motor shaft 20 is rotatably set in the first housing 14 and the second housing 15 through the bearing 71, the brake ring 50 is located at the head end of the motor shaft 20, the brake ring 50 is not located in the first housing 14, and is separated from the rotor, stator, and commutator 70 to prevent the debris generated by the friction of the brake ring 50 from contacting the rotor, stator, commutator 70 and other structures, thereby ensuring the stable operation of the one-way self-locking actuator, and there is no need to adjust the structure of the first housing 14.

[0051] Specifically, a slot 11 is provided on the inner wall of the housing 10, and the first end 61 of the open elastic preload ring 60 is bent radially outward to form a plug rib 611, and the plug rib 611 is plugged into the slot 11. This ensures that one end of the open elastic preload ring 60 is firmly fixed to the housing 10, so that the brake ring 50 can accurately push the open elastic preload ring 60 when rotating, and realizes the action of quickly and reliably providing or releasing the self-locking force.

[0052] The brake ring 50 is provided with an opening 51, and the second end 62 of the open elastic preload ring 60 is slidably connected in the opening 51. The opening 51 extends along the circumferential direction of the brake ring 50, so as to push the open elastic preload ring 60 to hold or release the brake ring 50 when the brake ring 50 rotates relative to the open elastic preload ring 60. A slight rotation of the brake ring 50 can quickly push the open elastic preload ring 60 to hold the brake ring 50, thereby achieving instant self-locking. This avoids the problem that the traditional torsion spring needs to rotate multiple times to hold tightly.

[0053] In order to ensure that the brake ring 50 pushes the opening elastic preload ring 60 more stably, the second end 62 of the opening elastic preload ring 60 is bent inward toward the center of the opening elastic preload ring 60 to form a positioning protrusion 621, and the positioning protrusion 621 extends into the opening 51 to cooperate with the opening 51. The brake ring 50 pushes the opening elastic preload ring 60 through the positioning protrusion 621, which increases the contact points between the opening elastic preload ring 60 and the brake ring 50, improves the stability of the entire self-locking mechanism, and can maintain a relatively stable self-locking effect under high load or vibration environment.

[0054] Since the positioning protrusion 621 extends into the opening 51, in order to prevent the positioning protrusion 621 from contacting the motor shaft 20 and affecting the rotation of the motor shaft 20, in this embodiment, the positioning protrusion 621 and the motor shaft 20 are arranged at intervals, thereby avoiding direct interference with the worm gear 40 or the motor shaft 20 during the self-locking process, ensuring the smooth operation of the self-locking mechanism, and reducing mechanical wear.

[0055] In order to ensure that there is enough space for the open elastic preload ring 60 to expand outward normally, an escape space 13 is provided between the housing 10 and the open elastic preload ring 60 to avoid the open elastic preload ring 60 from expanding outward. The design of the escape space 13 ensures that the open elastic preload ring 60 has enough space when it needs to expand outward and will not be hindered by the housing 10.

[0056] In order to prevent the open elastic preload ring 60 from being separated from the brake ring 50 in the axial direction of the motor shaft 20 due to the vibration generated by the operation of the one-way self-locking actuator, in the present embodiment, one side of the outer peripheral edge of the brake ring 50 is provided with a limiting rib 52 which abuts against the side wall of the open elastic preload ring 60, and the limiting rib 52 is located on one axial side of the open elastic preload ring 60, and the housing 10 is provided with a limiting step 16 located on the other axial side of the elastic preload ring 60 to limit the separation of the open elastic preload ring 60 from the brake ring 50 in the axial direction, thereby ensuring the stability of self-locking.

[0057] It should be noted that the installation direction of the open elastic preload ring 60 can be changed so that the input shaft rotates forward to push the open elastic preload ring 60 inward to hold the brake ring 50 and achieve friction self-locking, and the input shaft rotates reversely to push the open elastic preload ring 60 outward to loosen the brake ring 50 and unlock it.

[0058] In order to facilitate the change of the installation direction of the open elastic preload ring 60, an installation opening 12 is provided on the inner wall of the shell 10 and is laterally connected to the slot 11, so that the slot 11 is opened axially along the open elastic preload ring 60, and the installation opening 12 is used for the first end 61 to move into or out of the slot 11. The design of the installation opening 12 allows the open elastic preload ring 60 to move axially, so that the first end 61 can be easily moved into or out of the slot 11, and the open elastic preload ring 60 can be installed or removed from the shell 10, which greatly simplifies the installation and maintenance process.

[0059] In order to further prevent the first end portion 61 from moving out of the slot 11 due to the vibration generated by the operation of the one-way self-locking actuator, the mounting opening 12 and the limiting rib 52 are located on the same side of the open elastic preload ring 60, and the slot 11 is closed on the side opposite to the mounting opening 12, limiting the movement of the first end portion 61 along the side opposite to the mounting opening 12, and abutting against the limiting rib 52 and the side wall of the open elastic preload ring 60, limiting the movement of the other side of the open elastic preload ring 60, thereby ensuring that the open elastic preload ring 60 is firmly fixed in the axial direction and improving the stability and reliability of the self-locking structure.

[0060] In order to ensure the service life of the brake ring 50 and the open elastic preload ring 60, the brake ring 50 is made of POM material, which has high wear resistance and can maintain stable performance under high load and frequent use, reducing the frequency of maintenance and replacement. The open elastic preload ring 60 is made of manganese steel. Manganese steel has extremely high strength and toughness, and can maintain its shape and performance under high load and impact, ensuring that the open elastic preload ring 60 will not deform or break during operation.

[0061] It is understandable that in other embodiments, the brake ring and the input shaft may also achieve circumferential synchronous rotation of the two through spline matching or matching between a non-circular hole and a non-circular segment.

[0062] It can be understood that in other embodiments, the brake ring may also be provided with a positioning groove, and the second end of the open elastic preload ring is slidably connected in the positioning groove, and the positioning groove extends along the circumferential direction of the brake ring to push the open elastic preload ring to tighten or loosen the brake ring when the brake ring rotates relative to the open elastic preload ring. Without the need for an opening setting, the structural strength of the brake ring can be guaranteed, and the contact area between the brake ring and the input shaft can be guaranteed.

[0063] It can be understood that in other embodiments, both sides of the outer periphery of the brake ring are provided with limiting ribs that abut against the side walls of the open elastic preload ring, and the limiting ribs are located on both axial sides of the open elastic preload ring to limit the detachment of the open elastic preload ring and the brake ring in the axial direction.

[0064] It is understandable that in other embodiments, the brake ring may also be made of other wear-resistant materials such as POK, polyamide, polybutylene terephthalate, etc., and the open elastic preload ring may also be made of other rigid materials such as high-strength steel.

[0065] Embodiment 2:

[0066] like Figures 7 to 9 As shown, in this embodiment, the brake ring 50 is arranged at the rear end of the input shaft and can be flexibly adjusted and installed according to different application scenarios.

[0067] Furthermore, the first shell 14 includes a body 141 and a tail cover 142 , the tail cover 142 and the body 141 are detachably connected, the brake ring 50 is located in the tail cover 142 , the brake ring 50 is located on the motor shaft 20 , and the first end 61 of the open elastic preload ring 60 is fixedly connected to the tail cover 142 .

[0068] Embodiment three:

[0069] like Fig.10 and Fig.11 As shown, in this embodiment, a brake ring 50 is fixed on the worm wheel 40, and an open elastic preload ring 60 is sleeved on the outer periphery of the brake ring 50, which reduces the intermediate transmission links and can quickly generate friction when the worm wheel 40 rotates in the reverse direction to achieve rapid self-locking.

[0070] Specifically, a mounting portion 41 is protruded from the side wall of the worm wheel 40, the mounting portion 41 and the worm wheel 40 are coaxially arranged, and the brake ring 50 is arranged on the mounting portion 41. The positioning protrusion 621 and the mounting portion 41 are arranged at intervals.

[0071] Embodiment 4:

[0072] like Fig.12 As shown, in this embodiment, a brake ring 50 is fixed on the worm wheel 40 and the input shaft, and an open elastic preload ring 60 is sleeved on the outer periphery of the brake ring 50. When the worm wheel 40 or the input shaft has a tendency to rotate in the opposite direction, the two brake rings 50 can quickly push the open elastic preload ring 60 to close inward, generate friction, and achieve rapid self-locking. This improves the self-locking effect and reliability of the system. Even if one of the brake rings 50 fails, the other brake ring 50 can still play a role to ensure the safety and reliability of the system.

[0073] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A one-way self-locking actuator, comprising a housing, an input shaft arranged in the housing for receiving torque, and a worm gear for outputting torque, wherein the worm gear is drivingly connected to the input shaft, and the input shaft drives the worm gear to rotate to drive the load to move linearly, characterized in that: At least one of the worm wheel and the input shaft is provided with a brake ring, and the outer periphery of the brake ring is provided with an open elastic pre-tightening ring, the first end of the open elastic pre-tightening ring is fixed on the shell, and the second end of the open elastic pre-tightening ring is slidably connected to the brake ring. When the worm wheel has a tendency to rotate in the reverse direction, the brake ring pushes the open elastic pre-tightening ring to retract inward to hold the brake ring and frictionally self-lock. When the worm wheel has a tendency to rotate forward, the brake ring pushes the open elastic pre-tightening ring to expand outward to loosen the brake ring and unlock it.

2. The one-way self-locking actuator according to claim 1, characterized in that: The brake ring is provided with an opening, and the second end of the open elastic preload ring is slidably connected in the opening. The opening extends along the circumferential direction of the brake ring to push the open elastic preload ring to tighten or loosen the brake ring when the brake ring rotates relative to the open elastic preload ring.

3. The one-way self-locking actuator according to claim 2, characterized in that: The second end of the opening elastic preload ring is bent inwardly toward the center of the opening elastic preload ring to form a positioning protrusion, and the positioning protrusion extends into the opening to cooperate with the opening.

4. The one-way self-locking actuator according to claim 3, characterized in that: The brake ring is arranged on the worm wheel and / or the input shaft, and the positioning protrusion and the worm wheel and / or the input shaft are arranged at intervals.

5. The one-way self-locking actuator according to claim 1, characterized in that: At least one side of the outer periphery of the brake ring is provided with a limiting rib that abuts against the side wall of the open elastic preload ring. The limiting rib is located on the axial side of the open elastic preload ring to limit the separation of the open elastic preload ring and the brake ring in the axial direction.

6. The one-way self-locking actuator according to claim 5, characterized in that: A slot is provided on the inner wall of the shell, and the first end of the open elastic preload ring is bent outwardly in the radial direction of the open elastic preload ring to form an insert rib, and the insert rib is inserted into the slot.

7. The one-way self-locking actuator according to claim 6, characterized in that: The inner wall of the shell is provided with an installation opening which is laterally connected to the slot, and the installation opening is used for the first end of the open elastic preload ring to move into or out of the slot, and the installation opening and the limiting rib are located on the same side of the open elastic preload ring.

8. The one-way self-locking actuator according to claim 1, characterized in that: An escape space is provided between the shell and the open elastic pre-tightening ring to prevent the open elastic pre-tightening ring from expanding outwards.

9. The one-way self-locking actuator according to claim 1, characterized in that: The brake ring is located at the head end or the tail end of the input shaft.

10. The one-way self-locking actuator according to claim 1, characterized in that: The brake ring is made of POM material; and the opening elastic preload ring is made of manganese steel material.

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