Harmonic speed reducer with overload protection device on input shaft
By adopting locking components and adjusting parts in the harmonic reducer, the protective flexible wheel and rigid wheel assembly is separated from the protective flexible wheel and rigid wheel assembly when the external torque exceeds the preset value, the problems of high applicability and cost in the prior art are solved, and the problem of high applicability and cost is realized. Effective overload protection and extended equipment life.
Patent Information
- Application Number
- CN202421258661.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-06-03
AI Technical Summary
The overload protection method of existing harmonic reducers is limited in applicability, poor protection effect and high cost, which leads to the equipment being damaged in an overloaded state, and the complex structure is not conducive to miniaturization and lightweighting.
The input shaft with overload protection device including a wave generator, a flexible wheel and a rigid wheel assembly is adopted to achieve separation from each other through the locking assembly and the adjusting member when the external torque exceeds the preset value. The flexible wheel and a rigid wheel assembly are protected, and the adjusting member can Adjust preset torque to meet different scenario needs.
It realizes overload protection with simple structure and low cost, avoids reducer damage, extends equipment life, and reduces processing and disassembly costs.
Smart Images
Figure CN222277411U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of harmonic reducers, and in particular to a harmonic reducer with an input shaft overload protection device. Background Art
[0002] At present, there are two main ways to protect harmonic reducers from overload: 1. Use current transformers: The current transformer can convert the current in the circuit into a standard current signal, and then pass this signal to the overload protection device. When the current exceeds the set value of the rated current, the overload protection device will automatically cut off the power supply according to this signal to protect the harmonic reducer from damage. 2. Use electronic ammeters: Electronic ammeters can directly measure the current in the circuit and pass this current value to the overload protection device. The overload protection device will compare the current value with the set value of the rated current, and automatically cut off the power supply if it exceeds the set value.
[0003] However, the existing overload protection methods have the following disadvantages: 1. Poor applicability: The existing overload protection methods are mainly designed for specific types of harmonic reducers and have limited applicability. When encountering different types of harmonic reducers or special usage environments, these methods may no longer be applicable and need to be redesigned or other protection methods selected; 2. Poor protection effect: Some overload protection methods may not be able to detect the overload state of the harmonic reducer in a timely or accurate manner, resulting in poor protection effect. This may cause the harmonic reducer to continue to work in an overload state, thereby increasing its risk of damage; 3. High cost: Some overload protection methods require the use of expensive equipment or components, such as current transformers or electronic ammeters, which increases the cost of the equipment. For some users or applications with limited budgets, this may be an unacceptable burden.
[0004] In the related technology, a Chinese patent with application number 202111073052.8 discloses a harmonic reducer. When the control unit obtains that the real-time current of the motor is greater than the preset maximum current value, the control unit immediately controls the clutch to switch from the connected state to the disconnected state, and the output shaft is disconnected from the load connecting disk. The output shaft idles and cannot transmit the torque to the load connecting disk. The load connecting disk loses power input and cannot continue to rotate, thereby timely avoiding further collisions. It has a faster response speed, effectively ensures the safety of collaborative personnel, and prevents the harmonic reducer from being damaged and failing.
[0005] However, this structure is relatively complex and requires reprogramming of the control program. The axial size of the entire module will also increase significantly, which is not conducive to the development of the module towards miniaturization and lightweight. Utility Model Content
[0006] In order to simplify the structure and effectively implement the overload protection function, the present application provides a harmonic reducer with an input shaft overload protection device.
[0007] The present application provides a harmonic reducer with an input shaft overload protection device, which adopts the following technical solution:
[0008] A harmonic reducer with an input shaft overload protection device comprises a wave generator, a flexible wheel and a rigid wheel assembly, wherein the flexible wheel is movably sleeved on the outer periphery of the wave generator, and the rigid wheel assembly is sleeved on the outer periphery of the flexible wheel. The wave generator comprises a first input shaft and a second input shaft sleeved on the outer periphery of the first input shaft, a locking assembly and an adjusting member are arranged between the first input shaft and the second input shaft, the locking assembly is used to provide a predetermined force to achieve relative stillness between the first input shaft and the second input shaft, when the force between the first input shaft and the second input shaft is greater than the predetermined force provided by the locking assembly, the first input shaft and the second input shaft can rotate relative to each other, and the adjusting member can adjust the predetermined force provided by the locking assembly.
[0009] By adopting the above technical solution, when the external input torque does not exceed the preset torque, the first input shaft and the second input shaft are relatively stationary, and the wave generator realizes power transmission normally. When the external input torque exceeds the preset torque, the first input shaft and the second input shaft are disengaged from each other, which plays a role in protecting the flexible wheel and the rigid wheel assembly. At the same time, the size of the preset torque can be adjusted by the adjustment member to meet the needs of different scenarios. The solution of this application is simple in structure, can effectively realize overload protection, effectively avoid damage to the reducer, and extend the life of the reducer.
[0010] Optionally, a first slot is formed on the outer periphery of the first input shaft, and the locking assembly includes a first block and a first elastic member, the first block is connected to the first slot, the first elastic member has elastic potential energy for pushing the first block toward the first slot, and the adjusting member can change the elastic potential energy of the first elastic member.
[0011] By adopting the above technical solution, the structure is simplified and the processing cost is reduced.
[0012] Optionally, the adjusting member includes a first locking shaft, a first mounting hole for mounting the first elastic member is opened at the center of the first locking shaft, and the first locking shaft can adjust the position of the first locking shaft on the second input shaft along the extension and contraction direction of the first elastic member.
[0013] By adopting the above technical solution, the locking assembly and the adjusting member can be disassembled and assembled together, thereby reducing the disassembly and assembly costs.
[0014] Optionally, the outer periphery of the first locking shaft is threadedly connected to the second input shaft.
[0015] By adopting the above technical solution, the convenience of adjusting the first locking shaft is improved, and the connection adjustment of the elastic potential energy of the first elastic member can be achieved, and the adaptability is stronger.
[0016] Optionally, the outer diameter of the first locking shaft gradually increases in a direction approaching the first input shaft.
[0017] By adopting the above technical solution, the locking stability of the locking assembly is enhanced.
[0018] Optionally, an operating cavity is formed between the flexible wheel and the wave generator, and the operating end of the adjusting member is located in the operating cavity.
[0019] By adopting the above technical solution, it is easier for personnel to install and adjust.
[0020] Optionally, a second slot is formed on the inner wall of the second input shaft, and the locking assembly includes a second block and a second elastic member, the second block is connected to the second slot, the second elastic member has elastic potential energy for pushing the second block toward the second slot, and the adjusting member can change the elastic potential energy of the second elastic member.
[0021] By adopting the above technical solution, another technical concept is provided, providing more options.
[0022] Optionally, the adjusting member includes a second locking shaft, a second mounting hole for mounting the second elastic member is opened at the center of the second locking shaft, and the second locking shaft can adjust the position of the second locking shaft on the first input shaft along the extension and contraction direction of the second elastic member.
[0023] By adopting the above technical solution, the second locking shaft can also be set on the first input shaft. At this time, the space between the flexible wheel and the wave generator can be reduced, or the space can be used for other purposes, making the reducer structure more compact.
[0024] Optionally, the outer periphery of the second locking shaft is threadedly connected to the first input shaft.
[0025] By adopting the above technical solution, the threaded connection method can achieve connection adjustment with higher adjustment accuracy.
[0026] Optionally, the rigid wheel assembly includes a rigid wheel, an assembly inner ring and an assembly outer ring, the rigid wheel is meshed with the outer periphery of the flexible wheel, the rigid wheel is fixedly connected to the assembly inner ring, the assembly inner ring and the assembly outer ring are rotatably connected, and the assembly outer ring is fixedly connected to the flexible wheel.
[0027] By adopting the above technical solution, the flexible wheel can be fixed and the rigid wheel can be rotated, thereby achieving a higher reduction ratio.
[0028] In summary, the present application includes at least one of the following beneficial technical effects:
[0029] 1. When the external input torque exceeds the preset torque, the first input shaft and the second input shaft are disengaged from each other, which plays a role in protecting the flexible wheel and the rigid wheel assembly. At the same time, the size of the preset torque can be adjusted by the adjustment member to meet the needs of different scenarios. The application scheme has a simple structure, can effectively achieve overload protection, effectively avoid damage to the reducer, and extend the life of the reducer.
[0030] 2. The locking assembly and the adjusting part can be disassembled and assembled together, which reduces the disassembly and assembly cost.
[0031] 3. The overload protection device is easier for personnel to install and adjust. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.
[0033] Figure 2 yes Figure 1 Section view along AA.
[0034] Figure 3 yes Figure 2 Schematic diagram of the enlarged portion B.
[0035] Figure 4 It is a cross-sectional view of the overall structure of Example 2 of the present application.
[0036] Description of reference numerals:
[0037] 10. Wave generator; 11. First input shaft; 111. First slot; 12. Second input shaft; 121. Second slot; 13. Bearing; 20. Flexwheel; 30. Rigid wheel assembly; 31. Rigid wheel; 32. Assemble inner ring; 33. Assemble outer ring; 40. Locking assembly; 41. First clamping block; 42. First elastic member; 43. Second clamping block; 44. Second elastic member; 50. Adjusting member; 51. First locking shaft; 511. First mounting hole; 512. Anti-slip portion; 52. Second locking shaft; 521. Second mounting hole; 60. Operating chamber. DETAILED DESCRIPTION
[0038] The following is combined with Figure 1-4 This application is described in further detail.
[0039] The embodiment of the present application discloses a harmonic reducer with an input shaft overload protection device.
[0040] Example 1
[0041] Reference Figure 1 and Figure 2The harmonic reducer includes a wave generator 10 , a flexible wheel 20 and a rigid wheel assembly 30 . The flexible wheel 20 is movably sleeved on the outer periphery of the flexible bearing 13 of the wave generator 10 , and the rigid wheel assembly 30 is sleeved on the outer periphery of the flexible wheel 20 .
[0042] In this embodiment, the rigid wheel assembly 30 includes a rigid wheel 31, an assembled inner ring 32, and an assembled outer ring 33. The inner teeth of the rigid wheel 31 are meshed with the outer teeth of the flexible wheel 20. The rigid wheel 31 and the assembled inner ring 32 can be fixedly connected by the same bolt, and the assembled inner ring 32 and the assembled outer ring 33 are rotatably connected. The assembled outer ring 33 can be fixedly connected to the flexible wheel 20 by the same bolt. The principle of the reducer of the present application is that the flexible wheel 20 is fixed and the rigid wheel 31 rotates to achieve a higher reduction ratio.
[0043] Reference Figure 2 The wave generator 10 includes a first input shaft 11 and a second input shaft 12 sleeved on the outer periphery of the first input shaft 11, and the first input shaft 11 and the second input shaft 12 are rotatably connected through a bearing 13. A locking assembly 40 and an adjusting member 50 are arranged between the first input shaft 11 and the second input shaft 12, and the locking assembly 40 is used to provide a predetermined force to achieve relative stillness between the first input shaft 11 and the second input shaft 12. When the force between the first input shaft 11 and the second input shaft 12 is greater than the predetermined force provided by the locking assembly 40, the first input shaft 11 and the second input shaft 12 can rotate relatively, and the adjusting member 50 can adjust the magnitude of the predetermined force provided by the locking assembly 40.
[0044] Reference Figure 2 and Figure 3 In this embodiment, a first slot 111 is provided on the outer periphery of the first input shaft 11, and the locking assembly 40 includes a first block 41 and a first elastic member 42. The first block 41 is connected to the first slot 111, and the first elastic member 42 has elastic potential energy for pushing the first block 41 toward the first slot 111. The adjusting member 50 can change the elastic potential energy of the first elastic member 42.
[0045] In one embodiment, the first block 41 is spherical, and in other embodiments, the first block 41 may also be hemispherical. The first slot 111 is a conical slot, and in other embodiments, the first slot 111 may also be a semicircular slot, a U-shaped slot, etc.
[0046] In one embodiment, the adjusting member 50 is a first locking shaft 51, and a first mounting hole 511 for mounting the first elastic member 42 is provided at the center of the first locking shaft 51. The first elastic member 42 is a first spring, and one end of the first spring is connected to the bottom of the first mounting hole 511, and the other end is connected to the first clamping block 41. The first spring can push the first clamping block 41 toward the first clamping groove 111, so that a part of the structure of the first clamping block 41 is clamped in the first clamping groove 111, and the first input shaft 11 and the second input shaft 12 are locked by the action force between the first clamping block 41 and the first clamping groove 111. In other embodiments, the first elastic member 42 can also be a spring sheet, etc.
[0047] In a preferred embodiment, the outer periphery of the first locking shaft 51 is threadedly connected to the second input shaft 12, and the first locking shaft 51 is a locking screw. By twisting the locking screw, the position of the locking assembly 40 can be continuously adjusted to adjust the locking force of the locking assembly 40 for the first input shaft 11.
[0048] In order to facilitate the operation of the first locking shaft 51, an operating cavity 60 is formed between the flexible wheel 20 and the second input shaft 12, and the operating end of the adjusting member 50 is located in the operating cavity 60. Therefore, after the reducer is assembled, the position of the locking assembly 40 can also be quickly adjusted through the operating cavity 60.
[0049] In a preferred embodiment, an anti-slip portion 512 is disposed at the opening of the first mounting hole 511 , and the anti-slip portion 512 enables the first clamping block 41 to be placed in the first mounting hole 511 without being separated from the first mounting hole 511 .
[0050] In one embodiment, the outer diameter of the first locking shaft 51 gradually increases in a direction approaching the first input shaft 11 , so as to further enhance the stability of the first locking shaft 51 on the second input shaft 12 .
[0051] At the same time, the locking assembly 40 and the adjusting member 50 are arranged in multiple groups along the circumferential direction of the first input shaft 11 and the second input shaft 12 so that the forces on the first input shaft 11 and the second input shaft 12 are balanced.
[0052] The implementation principle of the harmonic reducer with an input shaft overload protection device in the embodiment of the present application is as follows: when the external input torque does not exceed the preset torque, the first input shaft 11 and the second input shaft 12 are relatively stationary, and the wave generator 10 realizes power transmission normally. When the external input torque exceeds the preset torque, the first input shaft 11 and the second input shaft 12 are separated from each other, which plays a role in protecting the flexible wheel 20 and the rigid wheel assembly 30. At the same time, the size of the preset torque can be adjusted by the adjustment member 50 to meet the needs of different scenarios.
[0053] Example 2
[0054] The difference between this embodiment and embodiment 1 is that, referring to Figure 4 , the design positions of the locking assembly 40 and the adjusting member 50 are different. In this embodiment, a second slot 121 is formed on the inner wall of the second input shaft 12, the locking assembly 40 includes a second clamping block 43 and a second elastic member 44, the second clamping block 43 is clamped in the second slot 121, the second elastic member 44 has elastic potential energy to push the second clamping block 43 toward the second slot 121, and the adjusting member 50 can change the elastic potential energy of the second elastic member 44.
[0055] In one embodiment, the adjusting member 50 includes a second locking shaft 52, and a second mounting hole 521 for mounting the second elastic member 44 is provided at the center of the second locking shaft 52. The second locking shaft 52 can adjust the position of the second locking shaft 52 on the first input shaft 11 along the expansion and contraction direction of the second elastic member 44. In a preferred embodiment, the outer periphery of the second locking shaft 52 is threadedly connected to the first input shaft 11.
[0056] The operating end of the second locking shaft 52 is located in the inner cavity of the first input shaft 11. When the first input shaft 11 is not connected to the external input, the position of the locking assembly 40 can be adjusted by adjusting the position of the second locking shaft 52 to adjust the locking force between the first input shaft 11 and the second input shaft 12.
[0057] Some structural changes of the second clamping block 43 , the second elastic member 44 and the second locking shaft 52 are similar to those in Embodiment 1 and are not described in detail herein.
[0058] The design of this embodiment does not require a space large enough for the operating chamber 60 to operate the adjusting member 50 , thereby reducing the space of the operating chamber 60 and improving the compactness of the internal structure of the reducer.
[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A harmonic reducer with an input shaft overload protection device, comprising a wave generator (10), a flexible wheel (20) and a rigid wheel assembly (30), wherein the flexible wheel (20) is movably sleeved on the outer periphery of the wave generator (10), and the rigid wheel assembly (30) is sleeved on the outer periphery of the flexible wheel (20), characterized in that: The wave generator (10) comprises a first input shaft (11) and a second input shaft (12) sleeved on the outer circumference of the first input shaft (11); a locking assembly (40) and an adjusting member (50) are arranged between the first input shaft (11) and the second input shaft (12); the locking assembly (40) is used to provide a predetermined force to achieve relative stillness between the first input shaft (11) and the second input shaft (12); when the force between the first input shaft (11) and the second input shaft (12) is greater than the predetermined force provided by the locking assembly (40), the first input shaft (11) and the second input shaft (12) can rotate relative to each other; and the adjusting member (50) can adjust the magnitude of the predetermined force provided by the locking assembly (40).
2. A harmonic reducer with an input shaft overload protection device according to claim 1, characterized in that: A first clamping groove (111) is formed on the outer circumference of the first input shaft (11); the locking assembly (40) comprises a first clamping block (41) and a first elastic member (42); the first clamping block (41) is clamped in the first clamping groove (111); the first elastic member (42) has elastic potential energy for pushing the first clamping block (41) toward the first clamping groove (111); and the adjusting member (50) is capable of changing the elastic potential energy of the first elastic member (42).
3. A harmonic reducer with an input shaft overload protection device according to claim 2, characterized in that: The adjusting member (50) comprises a first locking shaft (51), a first mounting hole (511) for mounting the first elastic member (42) is provided at the center of the first locking shaft (51), and the first locking shaft (51) can adjust the position of the first locking shaft (51) on the second input shaft (12) along the extension and contraction direction of the first elastic member (42).
4. A harmonic reducer with an input shaft overload protection device according to claim 3, characterized in that: The outer periphery of the first locking shaft (51) is threadedly connected to the second input shaft (12).
5. The harmonic reducer with an input shaft overload protection device according to claim 3, characterized in that: The outer diameter of the first locking shaft (51) gradually increases in a direction approaching the first input shaft (11).
6. The harmonic reducer with input shaft overload protection device according to claim 2, characterized in that An operating cavity (60) is formed between the flexible wheel (20) and the wave generator (10), and an operating end of the adjusting member (50) is located in the operating cavity (60).
7. The harmonic reducer with an input shaft overload protection device according to claim 1, characterized in that: A second clamping groove (121) is formed on the inner wall of the second input shaft (12); the locking assembly (40) comprises a second clamping block (43) and a second elastic member (44); the second clamping block (43) is clamped in the second clamping groove (121); the second elastic member (44) has elastic potential energy for pushing the second clamping block (43) toward the second clamping groove (121); and the adjusting member (50) is capable of changing the elastic potential energy of the second elastic member (44).
8. The harmonic reducer with an input shaft overload protection device according to claim 7, characterized in that: The adjusting member (50) comprises a second locking shaft (52), a second mounting hole (521) for mounting the second elastic member (44) being provided at the center of the second locking shaft (52), and the second locking shaft (52) is capable of adjusting the position of the second locking shaft (52) on the first input shaft (11) along the extension and contraction direction of the second elastic member (44).
9. A harmonic reducer with an input shaft overload protection device according to claim 8, characterized in that: The outer periphery of the second locking shaft (52) is threadedly connected to the first input shaft (11).
10. The harmonic reducer with an input shaft overload protection device according to claim 1, characterized in that: The rigid wheel assembly (30) comprises a rigid wheel (31), an assembly inner ring (32) and an assembly outer ring (33); the rigid wheel (31) is meshed with the outer periphery of the flexible wheel (20); the rigid wheel (31) is fixedly connected to the assembly inner ring (32); the assembly inner ring (32) and the assembly outer ring (33) are rotatably connected; and the assembly outer ring (33) is fixedly connected to the flexible wheel (20).