One-way brake device of motor

Abstract

The utility model discloses a one-way brake device of a motor, which belongs to the field of driving devices, solves the problem that the operation load of the motor is larger due to the fact that auxiliary self-locking force provided in the prior art always exists, and adopts the technical scheme that the one-way brake device mainly comprises a shell, a motor shaft and a worm gear, the motor shaft is provided with a worm section meshed with the worm gear, the motor shaft can axially move while rotating relative to the shell, the motor shaft is sleeved with a friction ring, the shell is provided with a channel for the motor shaft and the friction ring to pass through, and at least one of the friction ring and the inner wall of the channel is provided with a driving slope. In the process that the friction ring synchronously moves towards one end of the shell along with the motor shaft, the friction ring is folded towards the motor shaft under the action of the driving inclined face so as to tightly hold the motor shaft to provide auxiliary self-locking force, and in the process that the friction ring moves towards the opposite direction along with the motor shaft, the friction ring is separated from the motor shaft. The utility model is mainly used for increasing the self-locking force of the motor unidirectionally.

Description

Technical Field

[0001] The utility model relates to the field of driving devices, in particular to a one-way brake device for a motor. Background Art

[0002] In order to improve the self-locking force of the motor, the prior art, such as invention patent CN114458735A, discloses a self-locking mechanism of a worm. By adding a brake ring, the brake ring is sleeved on the worm, the brake ring and the worm are interference fit, the worm wheel and the worm are engaged, and the auxiliary self-locking force is provided by the friction between the brake ring and the worm. However, when the motor rotates forward and reverse, the worm and the brake ring are always in contact, and there is always friction between the worm and the brake ring, which increases the operating load of the motor. Utility Model Content

[0003] The purpose of the utility model is to provide a motor one-way brake device, which solves the problem that the auxiliary self-locking force provided in the prior art always causes a large operating load on the motor, and realizes unidirectional increase of the self-locking force of the motor.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a motor one-way brake device, comprising a housing, a motor shaft and a worm gear arranged in the housing, the motor shaft having a worm segment meshing with the worm gear, the motor shaft can move axially while rotating relative to the housing, a friction ring is sleeved on the motor shaft, the housing has a channel for the motor shaft and the friction ring to pass through, at least one of the inner walls of the friction ring and the channel is provided with a driving inclined surface, during the process of the friction ring synchronously moving toward one end of the housing with the motor shaft, the friction ring is retracted toward the motor shaft under the action of the driving inclined surface to hold the motor shaft tightly and provide auxiliary self-locking force, and during the process of the friction ring moving in the opposite direction with the motor shaft, the friction ring is separated from the motor shaft.

[0005] After adopting the above technical solution, the utility model has the following advantages: by arranging the friction ring and the driving inclined surface, when the motor shaft moves toward one end of the housing, the friction ring is retracted toward the motor shaft under the action of the driving inclined surface to hold the motor shaft tightly and provide auxiliary self-locking force, thereby improving the self-locking force of the motor; and when the motor shaft moves in the opposite direction, the friction ring is separated from the motor shaft, and no friction is generated, thereby no auxiliary self-locking force is provided to the motor, and the operating efficiency of the motor is not affected and the operating load of the motor is not increased.

[0006] Furthermore, an elastic pre-tightening member is sleeved on the friction ring, and the elastic pre-tightening member holds the friction ring tightly so that the friction ring has a tendency to keep closing towards the motor shaft.

[0007] With the above technical solution, due to the wear between the friction ring and the motor shaft, radial clearance exists between the friction ring and the motor shaft when the friction ring is retracted toward the motor shaft. This results in little or no friction between the friction ring and the motor shaft, and fails to provide the auxiliary self-locking force required by the motor. By providing an elastic preload, the elastic preload grips the friction ring, causing it to maintain a tendency to retract toward the motor shaft, thereby further retracting the friction ring toward the motor shaft. This ensures that the friction ring better conforms to the motor shaft as it moves synchronously with the motor shaft toward one end of the housing, thereby increasing the auxiliary self-locking force. The strength of the elastic preload can also be adjusted to conveniently adjust the grip of the friction ring, thereby varying the auxiliary self-locking force.

[0008] Furthermore, the friction ring includes a first section and a second section, the first section can extend into the channel, the second section is located at the end of the friction ring away from the driving inclined surface, the diameter of the second section is larger than the first section so that a first stop step is formed between the first section and the second section, the elastic preloaded member is sleeved on the first section, and one end of the elastic preloaded member abuts against the first stop step to limit the axial movement of the elastic preloaded member.

[0009] With the above technical solution, the elastic preload member is sleeved on the first section, and its axial movement is limited by the first stop step, which means that the first section is always subjected to the radial force of the elastic preload member, ensuring the clamping effect of the friction ring on the motor shaft.

[0010] Furthermore, a bearing is fixedly connected to the housing, and the motor shaft is installed on the housing through the bearing. A limit ring is installed on the motor shaft to limit the axial movement range of the motor shaft. The limit ring is located on both sides of the bearing and can rest on the bearing. The second section rests on the limit ring to limit the axial movement of the friction ring.

[0011] By adopting the above technical solution, the setting of the limit snap ring limits the axial movement range of the motor shaft, preventing the motor shaft from excessively moving in the axial direction, and the second section abuts against the limit snap ring to limit the axial movement of the friction ring. When the friction ring retracts inward under the action of the driving inclined surface, it ensures that the friction ring works at a predetermined position, thereby making the clamping force between the friction ring and the motor shaft more reliable and enhancing the self-locking effect.

[0012] Furthermore, the friction ring includes an annular body with an opening in the radial direction and a first limiting portion connected to both sides of the opening. The annular body is used to be sleeved on the outside of the motor shaft, and the shell is provided with a limiting groove located in the radial direction of the annular body. The first limiting portion protrudes radially from the annular body and can extend into the limiting groove, so as to limit the rotation of the annular body relative to the shell.

[0013] By adopting the above technical solution, the first limiting portion extends into the limiting groove of the shell, which can effectively prevent the friction ring from rotating synchronously with the motor shaft. When the motor shaft rotates, relative movement occurs between the motor shaft and the friction ring to generate friction and provide self-locking force.

[0014] Furthermore, a second limiting portion is provided on the annular body, and a third limiting portion is provided on the shell. The third limiting portion is located on one axial side of the second limiting portion and is spaced apart from the second limiting portion. When the friction ring moves synchronously with the motor shaft, the second limiting portion can cooperate with the third limiting portion stop to limit the axial displacement of the friction ring relative to the shell.

[0015] By adopting the above technical solution, the cooperation between the second limiting portion and the third limiting portion ensures that the friction ring moves within a specified range, thereby ensuring the clamping effect on the motor shaft.

[0016] Furthermore, the annular body is provided with a deformation groove which is conducive to the annular body being retracted toward the motor shaft.

[0017] With the above technical solution, the presence of the deformation groove makes the annular body more likely to deform when subjected to force. When the annular body is acted upon by the driving inclined surface, it can better hold the motor shaft, provide stronger friction, and improve the braking effect.

[0018] Furthermore, deformation grooves are provided on both the inner and outer sides of the annular body.

[0019] By adopting the above technical solution, the design of double-sided deformation grooves can enable the annular body to better hold the motor shaft when affected by the driving inclined surface, and can also disperse stress, reduce stress concentration in a single area, reduce the risk of material fatigue and fracture, and ensure the service life of the annular body.

[0020] Furthermore, the housing includes a reduction box for mounting the worm gear and the worm segment and a motor housing for mounting internal parts of the motor, and the friction ring is located in the reduction box.

[0021] With the above technical solution, the motor has many internal parts, and the reduction gearbox can provide a closed environment for the friction ring, effectively reducing the debris generated by the wear of the friction ring and the motor shaft from entering the motor, thereby ensuring the service life of the motor.

[0022] Furthermore, friction rings are provided at both the front and rear ends of the motor shaft. When the friction rings move synchronously with the motor shaft toward one end of the housing, the friction rings at both the front and rear ends hold the motor shaft tightly.

[0023] With the above technical solution, since there are friction rings at both ends, when the motor shaft moves toward one end, the two friction rings simultaneously hold the motor shaft tightly, providing double the auxiliary self-locking force, improving the braking effect, and evenly distributing the auxiliary self-locking force to improve the overall stability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 1 This is a schematic structural diagram of the one-way brake device for a motor in the present invention;

[0026] Figure 2 This is a cross-sectional view of the one-way brake device for a motor in the present utility model;

[0027] Figure 3 This is a partial structural diagram of the one-way brake device for a motor in the present utility model;

[0028] Figure 4 This is a schematic structural diagram of the friction ring and elastic preload member in the present invention;

[0029] Figure 5 This is a schematic structural diagram of the friction ring in the present utility model;

[0030] In the figure, 10, housing; 101, channel; 102, first area; 103, second area; 104, driving slope; 105, limiting groove; 106, third limiting portion; 11, motor housing; 12, reduction gear box; 20, motor shaft; 21, worm segment; 22, optical axis segment; 30, worm wheel; 40, friction ring; 41, first segment; 42, second segment; 43, first stop step; 44, annular body; 45, first limiting portion; 46, deformation groove; 47, opening; 50, elastic preload; 60, limiting snap ring; 70, bearing. DETAILED DESCRIPTION

[0031] 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, not all of the embodiments.

[0032] The terms "first," "second," "third," "fourth," and so on (if any) in the description and claims of the present invention and the drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0033] 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 order of execution 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.

[0034] 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.

[0035] It should be understood that in the present invention, "multiple" refers to two or more. "And / or" is only a description of the association relationship of related objects, indicating that three relationships can exist. For example, X and / or Y can represent three situations: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the previous and next related objects are in an "or" relationship. "Including X, Y and Z", "Including X, Y, Z" means that X, Y, and Z are all included, "Including X, Y or Z" means that one of X, Y, and Z is included, and "Including X, Y and / or Z" means that any one, any two, or any three of X, Y, and Z are included.

[0036] The following specific embodiments are used to describe the technical solution of the present invention in detail. 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.

[0037] like Figures 1 to 5 As shown, the utility model provides a motor one-way brake device for driving the movement of a load, mainly for driving the lifting of a lifting table. The motor one-way brake device includes a housing 10, a motor shaft 20 and a worm gear 30 disposed within the housing 10. The motor shaft 20 has a worm segment 21 meshing with the worm gear 30. The motor shaft 20 can rotate relative to the housing 10 while being axially movable. A friction ring 40 is sleeved on the motor shaft 20. The housing 10 has a channel 101 through which the motor shaft 20 and the friction ring 40 pass. At least one of the inner walls of the friction ring 40 and the channel 101 is provided with a driving inclined surface 104. When the friction ring 40 moves synchronously with the motor shaft 20 toward one end of the housing 10, the friction ring 40, under the action of the driving inclined surface 104, retracts toward the motor shaft 20 to hold the motor shaft 20 tightly, thereby providing auxiliary self-locking force to enhance the self-locking force of the motor. When the friction ring 40 moves in the opposite direction with the motor shaft 20, the friction ring 40 is separated from the motor shaft 20, and no friction is generated, thereby not providing auxiliary self-locking force to the motor, and not affecting the operating efficiency of the motor or increasing the operating load of the motor.

[0038] The motor shaft 20 further includes an optical shaft segment 22 , and the friction ring 40 is disposed on the optical shaft segment 22 but not on the worm segment 21 .

[0039] Preferably, the friction ring 40 and the inner wall of the channel 101 are both provided with a driving bevel 104. When the friction ring 40 moves synchronously with the motor shaft 20 toward one end of the housing 10, the driving bevel 104 of the friction ring 40 abuts against the driving bevel 104 on the inner wall of the channel 101, so that the friction ring 40 can be more smoothly retracted toward the motor shaft 20 to hold the motor shaft 20 tightly, thereby reducing the generation of friction noise, reducing the hard collision between the friction ring 40 and the motor shaft 20, and ensuring the service life of the friction ring 40 and the motor shaft 20.

[0040] It should be noted that the effect of the friction ring 40 gripping the motor shaft 20 can be adjusted by changing the inclination angle of the driving ramp 104, thereby adjusting the auxiliary self-locking force provided. Of course, the friction force between the friction ring 40 and the motor shaft 20 can also be adjusted by changing the roughness of the friction ring 40 and the motor shaft 20, thereby adjusting the auxiliary self-locking force provided.

[0041] For easy distinction, the channel 101 is divided into a first area 102 and a second area 103 along the axial direction of the motor shaft 20. The diameter of the first area 102 is smaller than that of the second area 103. The opening of the first area 102 gradually shrinks inward away from the second area 103 to form a driving slope 104.

[0042] Since the friction ring 40 separates from the motor shaft 20 during the process of moving in the opposite direction with the motor shaft 20, the friction ring 40 is not directly fixed on the motor shaft 20. In order to achieve the installation of the friction ring 40, the friction ring 40 includes an annular body 44 with a radial opening 47. The annular body 44 is used to be sleeved on the outside of the motor shaft 20. A second limiting portion is provided on the annular body 44. In this embodiment, the first limiting portion 45 and the second limiting portion are the same structure. The housing 10 is provided with a third limiting portion 106. The second limiting portion and the third limiting portion 106 are located in the second area 103. The third limiting portion 106 is located on one axial side of the second limiting portion and is spaced apart from the second limiting portion. When the friction ring 40 moves synchronously with the motor shaft 20, the second limiting portion can cooperate with the third limiting portion 106 to limit the axial displacement of the friction ring 40 relative to the housing 10.

[0043] It is understandable that in other embodiments, the third limiting portion may be located above the friction ring 40 , the first limiting portion 45 and the second limiting portion may be two separate structures, and the second limiting portion may be the top surface of the friction ring 40 .

[0044] The friction ring 40 includes a first section 41 and a second section 42. The first section 41 can extend into the channel 101. The second section 42 is located at the end of the friction ring 40 away from the driving ramp 104. The diameter of the second section 42 is larger than that of the first section 41, forming a first stop step 43 between the first and second sections 41, 42. An elastic preload member 50 is mounted on the first section 41 and located within the second region 103. One end of the elastic preload member 50 abuts against the first stop step 43 to limit its axial movement. The other end of the elastic preload member 50 abuts the connecting portion between the first and second regions 102, 103. This means that the first section 41 is always subjected to the radial force of the elastic preload member 50, ensuring that the friction ring 40 firmly holds the motor shaft 20. The elastic preload member 50 can be a spring.

[0045] The housing 10 is fixedly connected to a bearing 70, and the motor shaft 20 is mounted on the housing 10 via the bearing 70. A retaining ring 60 is mounted on the motor shaft 20 to limit the axial movement of the motor shaft 20. The retaining ring 60 is located on both sides of the bearing 70 and can abut against the bearing 70. The second section 42 abuts against the retaining ring 60 to limit the axial movement of the friction ring 40. The retaining ring 60 is located on the side of the friction ring 40 away from the driving inclined surface 104 and also on the side of the second limiting portion in the second region 103 away from the third limiting portion 106. A space is formed between the retaining ring 60 and the third limiting portion 106 for the axial movement of the second limiting portion. When the friction ring 40 retracts inward under the action of the driving inclined surface 104, it ensures that the friction ring 40 operates in the predetermined position, thereby ensuring a more reliable clamping force between the friction ring 40 and the motor shaft 20 and enhancing the self-locking effect. A bearing 70 is provided on the other side of the limiting retaining ring 60, and the motor shaft 20 is mounted on the housing 10 through the bearing 70. The friction ring 40 and the bearing 70 can also be separated and set to effectively reduce the friction ring 40 squeezing the bearing 70, thereby avoiding damaging the internal balls of the bearing 70 and causing abnormal noise or damage to the bearing 70.

[0046] In order to avoid hard collision between the friction ring 40 and the channel 101, preferably, when the motor shaft 20 moves toward both sides, the driving inclined surface 104 of the friction ring 40 always fits against the driving inclined surface 104 of the channel 101, and the other end of the friction ring 40 always rests on the limit clamping ring 60, thereby effectively limiting the axial movement of the friction ring 40 relative to the motor shaft 20, reducing noise generation, and also fixing the friction part between the friction ring 40 and the motor shaft 20, thereby specifically improving the wear resistance of the corresponding parts.

[0047] In order to prevent the friction ring 40 and the motor shaft 20 from rotating synchronously, the friction ring 40 also includes a first limiting portion 45 connected to both sides of the opening 47. The housing 10 is provided with a limiting groove 105 located in the radial direction of the annular body 44. The first limiting portion 45 protrudes radially from the annular body 44 and can extend into the limiting groove 105, which is used to limit the rotation of the annular body 44 relative to the housing 10. When the motor shaft 20 rotates, relative movement occurs between the motor shaft 20 and the friction ring 40 to generate friction and provide a self-locking force.

[0048] It should be noted that the inner wall of the limiting groove 105 forms a third limiting portion 106 .

[0049] To facilitate the retraction of the annular body 44 toward the motor shaft 20, a deformation groove 46 is provided on the annular body 44 to facilitate the retraction of the annular body 44 toward the motor shaft 20. The presence of the deformation groove 46 makes it easier for the annular body 44 to deform when subjected to force. When acted upon by the driving inclined surface 104, the annular body 44 can better grip the motor shaft 20, providing stronger friction and improving the braking effect.

[0050] Furthermore, deformation grooves 46 are provided on both the inner and outer sides of the annular body 44. The design of the double-sided deformation grooves 46 allows the annular body 44 to better grip the motor shaft 20 when subjected to the driving inclined surface 104. It also disperses stress, reduces stress concentration in a single area, reduces the risk of material fatigue and fracture, and ensures the service life of the annular body 44.

[0051] Among them, there are multiple deformation grooves 46, which are arranged along the circumference of the annular body 44. The deformation grooves 46 on the inner and outer sides of the annular body 44 are located in corresponding positions. The deformation grooves 46 are arranged in a straight line along the annular body 44 in the axial direction of the motor shaft 20, so that different parts of the annular body 44 have good deformation capabilities.

[0052] Because the friction ring 40 and the motor shaft 20 are susceptible to wear, radial clearance exists between them when the friction ring 40 is retracted toward the motor shaft 20. This results in minimal or no friction between the friction ring 40 and the motor shaft 20, failing to provide the auxiliary self-locking force required by the motor. To address this, an elastic preload 50 is sleeved over the friction ring 40. The elastic preload 50 is located within the second region 103 and grips the friction ring 40 tightly, causing it to maintain a tendency to retract toward the motor shaft 20. This forces the friction ring 40 to retract further toward the motor shaft 20, ensuring that the friction ring 40 adheres better to the motor shaft 20 as it moves synchronously with the motor shaft 20 toward one end of the housing 10, thereby increasing the auxiliary self-locking force. Adjusting the strength of the elastic preload 50 can also conveniently adjust the grip of the friction ring 40, thereby varying the auxiliary self-locking force.

[0053] It should be noted that the elastic preload member 50 has relatively low elasticity. When the motor shaft 20 moves in the opposite direction, the friction force generated by the contact between the friction ring 40 and the motor shaft 20 is relatively small and can be ignored.

[0054] Finally, the housing 10 includes a reduction gearbox 12 for mounting the worm gear 30 and worm segment 21, and a motor housing 11 for mounting the motor's internal components. Because the motor contains precision components such as the stator, rotor, and commutator, in this embodiment, to reduce the risk of motor failure, a friction ring 40 is located within the reduction gearbox 12. The reduction gearbox 12 provides a sealed environment for the friction ring 40, effectively preventing debris from entering the motor due to wear between the friction ring 40 and the motor shaft 20, thereby ensuring the motor's service life.

[0055] It should be noted that the motor has a rotor inside. When the motor rotates forward, the rotor drives the worm segment 21 through the motor shaft 20, which in turn drives the worm wheel 30 to rotate, thereby lifting the load. At this time, the worm wheel 30 applies a downward force to the worm segment 21, causing the worm segment 21, the motor shaft 20, and the friction ring 40 to move downward. The friction ring 40 disengages from the drive ramp 104 and expands outward to return to its original state. The friction ring 40 is separated from the motor shaft 20 and does not provide auxiliary self-locking force for the motor shaft 20. When the motor rotates reversely, the worm wheel 30 rotates counterclockwise to drive the load downward. At this time, the worm wheel 30 applies an upward force to the worm segment 21, causing the worm segment 21, the motor shaft 20, and the friction ring 40 to move upward. Under the action of the drive ramp 104, the friction ring 40 retracts toward the motor shaft 20, tightly gripping the motor shaft 20 and providing auxiliary self-locking force. Furthermore, when the motor stops rotating, the gravity of the load applies a counterclockwise torque to the worm gear 30. The torque is transmitted to the worm segment 21 through the worm gear 30, causing the motor shaft 20 to move upward. The friction ring 40 moves upward along with the motor shaft 20. Under the action of the driving inclined surface 104, the friction ring 40 retracts toward the motor shaft 20 to hold the motor shaft 20 tightly and provide an auxiliary self-locking force to prevent the motor shaft 20 from rotating. The greater the gravity of the load, the greater the auxiliary self-locking force provided, so that the load can be stably placed in the set position.

[0056] It is understandable that in other embodiments, the friction ring is provided with a driving bevel, and the inner wall of the channel is not provided with a driving bevel, so that the contact area between the friction ring and the inner wall of the channel is smaller and there are fewer parts where wear occurs.

[0057] It is understandable that in other embodiments, the inner wall of the channel is provided with a driving bevel, while the friction ring is not provided with a driving bevel, so that the contact area between the friction ring and the inner wall of the channel is smaller and fewer parts are subject to wear.

[0058] It is understandable that in other embodiments, friction rings are provided at both the front and rear ends of the motor shaft. When the friction rings move synchronously with the motor shaft toward one end of the housing, the friction rings at the front and rear ends both hold the motor shaft tightly. Since there are friction rings at both ends, when the motor shaft moves toward one end, the two friction rings hold the motor shaft at the same time, providing double auxiliary self-locking force, improving the braking effect, and evenly distributing the auxiliary self-locking force to improve the overall stability of the motor.

[0059] In addition to the above-mentioned preferred embodiments, the present invention has other implementation methods. Based on the embodiments in 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 brake device for a motor, comprising a housing, a motor shaft disposed in the housing, and a worm gear, wherein the motor shaft has a worm segment meshing with the worm gear, and wherein: The motor shaft can move axially while rotating relative to the housing. A friction ring is sleeved on the motor shaft. The housing has a channel for the motor shaft and the friction ring to pass through. At least one of the inner walls of the friction ring and the channel is provided with a driving inclined surface. When the friction ring moves synchronously with the motor shaft toward one end of the housing, the friction ring is retracted toward the motor shaft under the action of the driving inclined surface to hold the motor shaft tightly and provide an auxiliary self-locking force. When the friction ring moves in the opposite direction with the motor shaft, the friction ring is separated from the motor shaft.

2. The one-way brake device for a motor according to claim 1, characterized in that: An elastic pre-tightening member is sleeved on the friction ring, and the elastic pre-tightening member holds the friction ring tightly so that the friction ring has a tendency to keep closing towards the motor shaft.

3. The one-way brake device for a motor according to claim 2, characterized in that: The friction ring includes a first section and a second section, the first section can extend into the channel, the second section is located at the end of the friction ring away from the driving inclined surface, the diameter of the second section is larger than the first section so that a first stop step is formed between the first section and the second section, the elastic preloaded member is sleeved on the first section, and one end of the elastic preloaded member abuts against the first stop step to limit the axial movement of the elastic preloaded member.

4. The one-way brake device for a motor according to claim 3, characterized in that: A bearing is fixedly connected to the housing, and the motor shaft is installed on the housing through the bearing. A limit ring is installed on the motor shaft to limit the axial movement range of the motor shaft. The limit ring is located on both sides of the bearing and can rest on the bearing. The second section rests on the limit ring to limit the axial movement of the friction ring.

5. The one-way brake device for a motor according to any one of claims 1 to 4, characterized in that: The friction ring includes an annular body with an opening in the radial direction and a first limiting portion connected to both sides of the opening. The annular body is used to be sleeved outside the motor shaft. The shell is provided with a limiting groove located in the radial direction of the annular body. The first limiting portion protrudes radially from the annular body and can extend into the limiting groove to limit the rotation of the annular body relative to the shell.

6. The one-way brake device for a motor according to claim 5, characterized in that: The annular body is provided with a second limiting portion, and the shell is provided with a third limiting portion. The third limiting portion is located on one axial side of the second limiting portion and is spaced apart from the second limiting portion. When the friction ring moves synchronously with the motor shaft, the second limiting portion can cooperate with the third limiting portion stopper to limit the axial displacement of the friction ring relative to the shell.

7. The one-way brake device for a motor according to claim 5, characterized in that: The annular body is provided with a deformation groove which is conducive to the annular body being retracted toward the motor shaft.

8. The one-way brake device for a motor according to claim 7, characterized in that: Deformation grooves are provided on both the inner and outer sides of the annular body.

9. The one-way brake device for a motor according to claim 1, characterized in that: The housing comprises a reduction box for mounting a worm wheel and a worm segment and a motor housing for mounting internal parts of the motor, and the friction ring is located in the reduction box.

10. The one-way brake device for a motor according to claim 1, characterized in that: Friction rings are provided at both the front and rear ends of the motor shaft. When the friction rings move synchronously with the motor shaft toward one end of the housing, the friction rings at both the front and rear ends hold the motor shaft tightly.

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