Motor brake device

Abstract

The utility model discloses a motor brake device, which belongs to the field of driving devices, solves the problem of insufficient self-locking force of a motor in the prior art, and adopts the technical scheme that the motor brake device mainly comprises a shell, a bearing arranged in the shell, a motor shaft and a worm gear, the motor shaft is provided with a worm section meshed with the worm gear, the bearing is fixed on the shell, and the worm section is fixed on the shell. The motor shaft is installed in the shell through a bearing, the motor shaft is sleeved with a friction ring and an elastic pushing piece, the motor shaft can rotate relative to the friction ring, a channel for the friction ring to penetrate through is formed in the end, away from the bearing, of the friction ring of the shell, and at least one of the friction ring and the inner wall of the channel is provided with a driving slope. The elastic pushing piece is supported on the friction ring and the bearing in the axial direction of the motor shaft, the elastic force of the elastic pushing piece pushes the friction ring to enter the channel, and the friction ring is folded towards the motor shaft under the action of the driving inclined face to tightly hold the motor shaft for friction self-locking. The self-locking motor is mainly used for increasing the self-locking force of the motor.

Description

Technical Field

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

[0002] Prior art motors, such as utility model patent CN208596999U, disclose a self-locking DC motor that uses a worm gear structure. When the motor drives a load to a set height and then stops, the worm gear structure self-locks to keep the load at the set height. However, if the weight of the load exceeds the self-locking force of the worm gear, the worm gear will reverse and the load will slip, so an additional self-locking structure is needed. Utility Model Content

[0003] The purpose to be achieved by the utility model is to provide a motor brake device, which solves the problem of insufficient self-locking force of the motor in the prior art and increases 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 brake device, comprising a housing, a bearing arranged in the housing, a motor shaft and a worm gear, the motor shaft having a worm segment meshing with the worm gear, the bearing being fixed to the housing, the motor shaft being installed in the housing through the bearing, a friction ring and an elastic push piece being sleeved on the motor shaft, the motor shaft being capable of relative rotation with the friction ring, the housing being provided with a channel for the friction ring to pass through at one end of the friction ring away from the bearing, at least one of the inner walls of the friction ring and the channel being provided with a driving inclined surface, the elastic push piece being supported between the friction ring and the bearing along the axial direction of the motor shaft, the elastic force of the elastic push piece pushing the friction ring into the channel, the friction ring being retracted toward the motor shaft under the action of the driving inclined surface to hold the motor shaft tightly and frictionally lock.

[0005] After adopting the above technical solution, the utility model has the following advantages: on the basis of the self-locking force provided by the meshing of the worm gear segments, the friction ring is retracted toward the motor shaft under the action of the driving inclined surface to hold the motor shaft tightly for friction self-locking, so as to increase the self-locking force of the motor, thereby increasing the load capacity of the motor, and effectively preventing the load from sliding even if the load is heavy. At the same time, the elastic recommendation is to use the bearing as the base to push the friction ring into the channel. The elastic pusher can provide continuous pressure, so that even if the friction ring is worn due to long-term use, it can still ensure that the friction ring is closely fitted to the motor shaft, so that the friction ring always fits the motor shaft, ensuring that the motor always has a large self-locking force.

[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] The above technical solution allows the elastic preload to provide a continuous preload, ensuring that the friction ring is always drawn toward the motor shaft. This ensures that even after the friction ring wears, the elastic preload automatically adjusts its force to maintain sufficient contact pressure between the friction ring and the motor shaft, further reducing the gap caused by wear and maintaining a good friction self-locking effect.

[0008] Furthermore, a snap ring is provided on the motor shaft, and the snap ring is located at both ends of the bearing and contacts the bearing, and the elastic push piece is supported on the bearing through the snap ring.

[0009] With the above technical solution, since the bearing is fixed on the housing, the retaining ring is located at both ends of the bearing and contacts the bearing, that is, the retaining ring is fixed relative to the housing, effectively fixing the position of the motor shaft and reducing the axial movement of the motor shaft in the bearing. The elastic pusher is supported on the bearing by the retaining ring and does not directly rest on the bearing, which can reduce the direct pressure of the elastic pusher on the bearing. The retaining ring can disperse the pressure of the elastic pusher, so that the pressure is more evenly distributed on the outer ring of the bearing, avoiding excessive concentration of stress on one point, thereby reducing the risk of local damage to the bearing and ensuring the service life of the bearing.

[0010] Furthermore, a fixed gasket is provided between the elastic push piece and the snap ring, and the elastic push piece and the snap ring are supported on both sides of the fixed gasket respectively.

[0011] By adopting the above technical solution, the fixed gasket can provide a flat supporting surface, making the contact between the elastic push piece and the retaining ring more stable, reducing the shaking or deviation caused by the uneven supporting surface, thereby ensuring that the friction ring can better hold the motor shaft.

[0012] Furthermore, the friction ring is provided with a supporting step with the step surface facing the bearing, and the elastic push piece is supported on the step surface.

[0013] By adopting the above technical solution, a support step with the step surface facing the bearing is set on the friction ring, which can ensure that the position of the elastic push piece is precisely defined. The support step can ensure that the elastic push piece remains stable during the operation of the motor, which helps to ensure the stability of the friction force between the friction ring and the motor shaft.

[0014] Furthermore, the elastic pusher includes an elastic corrugated gasket, and the corrugated gasket respectively abuts against a side surface of the bearing and a side surface of the friction ring.

[0015] By adopting the above technical solution, the corrugated gasket has good elastic properties and can automatically adjust the preload force. Even when the friction ring is worn or the temperature changes, the corrugated gasket can maintain appropriate preload force to ensure the stability of the friction between the friction ring and the motor shaft.

[0016] Furthermore, at least two of the corrugated gaskets are provided, and the at least two corrugated gaskets are stacked along the axial direction of the motor shaft.

[0017] By adopting the above technical solution, a plurality of stacked corrugated gaskets can superimpose their respective elastic forces, thereby enhancing the pre-tightening force on the friction ring.

[0018] Furthermore, the friction ring is provided with a limiting rib extending radially outward, and the housing is provided with a limiting groove adapted to the limiting rib, and the limiting rib is snapped into the limiting groove to limit the circumferential rotation of the friction ring.

[0019] By adopting the above technical solution, the limiting rib is stuck in the limiting groove, which can effectively prevent the friction ring and the motor shaft from rotating synchronously. When the motor shaft rotates, relative movement occurs between the motor shaft and the friction ring to generate friction and provide self-locking force.

[0020] Furthermore, the motor shaft also includes an optical shaft segment, and the friction ring is located in the optical shaft segment and close to the worm segment.

[0021] With this technical solution, the friction ring's proximity to the worm segment reduces the motor shaft's bending stress during braking. Because the distance between the friction ring and the worm segment is shorter, the bending moment generated during braking is smaller, reducing bending deformation of the motor shaft.

[0022] Furthermore, the friction ring is located at the front end or the rear end of the motor shaft.

[0023] By adopting the above technical solution, the friction ring can be set at the front end or rear end of the motor shaft according to specific application requirements, adapting to different installation spaces and working environments, thereby enhancing design flexibility. 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 motor brake device in the present utility model;

[0026] Figure 2 This is a cross-sectional view of the motor brake device in the present invention;

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

[0028] Figure 4 This is an exploded view of part of the structure of the motor brake device in the present invention;

[0029] Figure 5 This is a schematic structural diagram of the friction ring and the elastic preload member in the present invention;

[0030] Figure 6 This is a schematic structural diagram of the friction ring in the present utility model;

[0031] In the figure, 10, housing; 101, channel; 102, driving slope; 103, limiting groove; 11, motor housing; 12, reduction gear box; 20, motor shaft; 21, worm segment; 22, optical axis segment; 30, worm wheel; 40, friction ring; 41, supporting step; 42, limiting rib; 43, opening; 50, elastic preload member; 60, retaining ring; 70, bearing; 80, elastic push member; 90, fixing gasket. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] like Figures 1 to 6 As shown, the utility model provides a motor brake device for driving a load to move, mainly used for driving the lifting table to rise and fall. The motor brake device includes a housing 10, a bearing 70 arranged in the housing 10, a motor shaft 20 and a worm gear 30. The motor shaft 20 has a worm segment 21 meshing with the worm gear 30. The bearing 70 is fixed to the housing 10. The motor shaft 20 is installed in the housing 10 through the bearing 70. A friction ring 40 and an elastic push piece 80 are sleeved on the motor shaft 20. The motor shaft 20 can rotate relative to the friction ring 40. The housing 10 is provided with a channel 101 for the friction ring 40 to pass through at one end of the friction ring 40 away from the bearing 70. At least one of the inner walls of the friction ring 40 and the channel 101 is provided with a driving inclined surface 102. The elastic push piece 80 is supported between the friction ring 40 and the bearing 70 along the axial direction of the motor shaft 20. The elastic force of the elastic push piece 80 pushes the friction ring 40 into the channel 101. Under the action of the driving inclined surface 102, the friction ring 40 is retracted toward the motor shaft 20 to hold the motor shaft 20 and frictionally self-lock.

[0039] On the basis of the self-locking force provided by the meshing of the worm gear 30 and the worm segment 21, the friction ring 40 is retracted toward the motor shaft 20 under the action of the driving inclined surface 102 to hold the motor shaft 20 tightly and frictionally lock, thereby increasing the self-locking force of the motor, thereby increasing the load capacity of the motor. Even if the load is heavy, it can effectively prevent the load from sliding down. At the same time, the elastic pusher 80 uses the bearing 70 as a base to push the friction ring 40 into the channel 101. The elastic pusher 80 can provide continuous pressure, so that even if the friction ring 40 wears due to long-term use, it can still ensure that the friction ring 40 is closely fitted to the motor shaft 20, so that the friction ring 40 always fits the motor shaft 20, ensuring that the motor always has a large self-locking force.

[0040] It should be noted that the friction ring 40 has an opening 43 to allow it to be radially contracted or expanded.

[0041] Among them, the friction ring 40 is provided with a limiting rib 42 extending radially outward, and the housing 10 is provided with a limiting groove 103 adapted to the limiting rib 42. The limiting rib 42 is snapped into the limiting groove 103 to limit the circumferential rotation of the friction ring 40, which can effectively prevent the friction ring 40 from rotating synchronously with the motor shaft 20. When the motor shaft 20 rotates, relative movement occurs between the motor shaft 20 and the friction ring 40 to generate friction and provide self-locking force.

[0042] The worm segment 21 is located at the front end of the motor shaft 20, which also includes an optical axis segment 22. The friction ring 40 is located in the optical axis segment 22 and is located near the worm segment 21, that is, the friction ring 40 is located at the front end of the motor. The proximity of the friction ring 40 to the worm segment 21 can reduce the bending stress of the motor shaft 20 during braking. Because the distance between the friction ring 40 and the worm segment 21 is relatively short, the bending moment generated during braking is relatively small, reducing the bending deformation of the motor shaft 20. The diameter of the channel 101 gradually expands from top to bottom to form a driving inclined surface 102. The elastic pusher 80 is located below the friction ring 40 and pushes the friction ring 40 upward. Under the action of the driving inclined surface 102, the friction ring 40 retracts toward the motor shaft 20 to hold the motor shaft 20 tightly and frictionally lock the motor shaft 20. Among them, the housing 10 includes a motor housing 11 and a reduction gearbox 12, the friction ring 40 is located in the reduction gearbox 12, and the connection between the motor housing 11 and the reduction gearbox 12 is filled by a bearing 70, which effectively prevents debris generated by the friction between the friction ring 40 and the motor shaft 20 from entering the interior of the motor housing 11.

[0043] In order to prevent the motor shaft 20 from axial movement, a retaining ring 60 is provided on the motor shaft 20. The retaining ring 60 is located at both ends of the bearing 70 and abuts against the bearing 70, effectively fixing the position of the motor shaft 20 and reducing the axial movement of the motor shaft 20 in the bearing 70.

[0044] Since the thrust of the elastic push piece 80 is relatively large, if it directly contacts the bearing 70, the bearing 70 may be easily damaged. For this reason, in this embodiment, the elastic push piece 80 is supported on the bearing 70 by the retaining ring 60 and does not directly contact the bearing 70, which can reduce the direct pressure of the elastic push piece 80 on the bearing 70. The retaining ring 60 can disperse the pressure of the elastic push piece 80, so that the pressure is more evenly distributed on the outer ring of the bearing 70, avoiding excessive concentration of stress on one point, thereby reducing the risk of local damage to the bearing 70 and ensuring the service life of the bearing 70.

[0045] In order to minimize the shaking of the elastic push piece 80, a fixed gasket 90 is provided between the elastic push piece 80 and the retaining ring 60. The elastic push piece 80 and the retaining ring 60 are supported on both sides of the fixed gasket 90 respectively. The fixed gasket 90 can provide a flat supporting surface, and the supporting surface area is large, so that the contact between the elastic push piece 80 and the retaining ring 60 is more stable, reducing the shaking or deviation caused by the uneven supporting surface, thereby ensuring that the friction ring 40 can better hold the motor shaft 20.

[0046] Furthermore, the friction ring 40 is provided with a support step 41 with its stepped surface facing the bearing 70, and the elastic pusher 80 is supported on the stepped surface. Providing the support step 41 on the friction ring 40 with its stepped surface facing the bearing 70 ensures that the position of the elastic pusher 80 is precisely defined. The support step 41 ensures that the elastic pusher 80 remains stable during motor operation, helping to maintain the stability of the friction between the friction ring 40 and the motor shaft 20.

[0047] Preferably, the elastic pusher 80 includes a resilient corrugated washer that abuts against one side of the bearing 70 and one side of the friction ring 40, respectively. The corrugated washer has excellent elasticity and can automatically adjust the preload. Even when the friction ring 40 wears or the temperature changes, the corrugated washer can maintain the appropriate preload, ensuring the stability of the friction between the friction ring 40 and the motor shaft 20.

[0048] Furthermore, at least two corrugated washers are provided, stacked axially along the motor shaft 20. The stacked corrugated washers can combine their respective elastic forces, thereby enhancing the preload force on the friction ring 40. Therefore, by varying the number of corrugated washers, the preload force on the friction ring 40 can be varied, thereby varying the self-locking force provided by the friction ring 40. Preferably, two corrugated washers are provided. Of course, in other embodiments, three, four, or other corrugated washers may also be provided.

[0049] Because the friction ring 40 and the motor shaft 20 are susceptible to wear, radial clearance between them results. This results in minimal or no friction between them, preventing them from providing the necessary auxiliary self-locking force. Therefore, an elastic preload 50 is mounted on the friction ring 40. This elastic preload 50 grips the friction ring 40 tightly, ensuring that it tends to retract toward the motor shaft 20. The elastic preload 50 provides a continuous preload, ensuring that the friction ring 40 remains retracted toward the motor shaft 20. This ensures that even after wear, the elastic preload 50 automatically adjusts its force to maintain sufficient contact pressure between the friction ring 40 and the motor shaft 20, further reducing clearance issues caused by wear and maintaining a good friction self-locking effect. Adjusting the strength of the elastic preload 50 also allows for convenient adjustment of the grip of the friction ring 40, thereby varying the self-locking force. The elastic preload 50 can be a spring.

[0050] It is understandable that in other embodiments, the friction ring is located at the rear end of the motor shaft. According to specific application requirements, the friction ring can be selected to be set at the rear end of the motor shaft to adapt to different installation spaces and working environments, thereby enhancing design flexibility.

[0051] It is understandable that in other embodiments, the elastic push member may also be a spring with a simple structure.

[0052] 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 motor brake device, comprising a housing, a bearing disposed in the housing, a motor shaft, and a worm gear, wherein the motor shaft has a worm segment meshing with the worm gear, the bearing being fixed to the housing, and the motor shaft being mounted in the housing via the bearing, characterized in that: A friction ring and an elastic push piece are sleeved on the motor shaft, and the motor shaft can rotate relative to the friction ring. The housing is located at the end of the friction ring away from the bearing and is provided with a channel for 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. The elastic push piece is supported between the friction ring and the bearing along the axial direction of the motor shaft. The elastic force of the elastic push piece pushes the friction ring into the channel. Under the action of the driving inclined surface, the friction ring is retracted toward the motor shaft to hold the motor shaft tightly and frictionally lock.

2. The motor brake device 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 motor brake device according to claim 1, characterized in that: The motor shaft is provided with a snap ring, which is located at both ends of the bearing and contacts the bearing, and the elastic push piece is supported on the bearing through the snap ring.

4. The motor brake device according to claim 3, characterized in that: A fixed gasket is provided between the elastic push piece and the snap ring, and the elastic push piece and the snap ring are supported on both sides of the fixed gasket respectively.

5. The motor brake device according to claim 1, characterized in that: The friction ring is provided with a supporting step with a step surface facing the bearing, and the elastic push piece is supported on the step surface.

6. The motor brake device according to any one of claims 1 to 5, characterized in that: The elastic push piece includes an elastic corrugated washer, and the corrugated washer respectively abuts against a side surface of the bearing and a side surface of the friction ring.

7. The motor brake device according to claim 6, characterized in that: There are at least two corrugated washers, and the at least two corrugated washers are stacked along the axial direction of the motor shaft.

8. The motor brake device according to claim 1, characterized in that: The friction ring is provided with a limiting rib extending radially outward, and the housing is provided with a limiting groove adapted to the limiting rib. The limiting rib is inserted into the limiting groove to limit the circumferential rotation of the friction ring.

9. The motor brake device according to claim 1, characterized in that: The motor shaft further comprises an optical shaft segment, and the friction ring is located on the optical shaft segment.

10. The motor brake device according to claim 1, characterized in that: The friction ring is located at the front end or the rear end of the motor shaft.

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