A motor shafting with high bearing capacity
By employing a design combining a front bearing and a disc spring in the motor shaft system, along with coaxial configuration and multi-layer pressure ring fixation, the problem of insufficient buffering in the motor shaft system under special conditions is solved, achieving high load-bearing capacity and stable operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU KEDE JIUTIAN ELECTRONIC TECH CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-05-26
AI Technical Summary
In existing technologies, the satellite flywheel motor shaft system has insufficient buffering capacity under special circumstances, resulting in unstable operation and making it difficult to meet the requirements of high reliability and high performance.
A high-load-bearing motor shaft system was designed, which uses a front bearing and a disc spring combined in the first receiving cavity at one end of the housing, and a rear bearing in the second receiving cavity of the rear cover. Through coaxial arrangement and multi-layer pressure ring fixation, complex stress is dispersed, providing elastic support and buffer.
It improves the load-bearing capacity and stability of the motor shaft system, reduces friction and wear, extends service life, and is suitable for high impact resistance requirements in special occasions.
Smart Images
Figure CN224289502U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of aerospace technology, and more specifically, to a high-load-bearing motor shaft system. Background Technology
[0002] Advances in aerospace technology and the demands of the aerospace market have stimulated the application of satellite technology, especially microsatellites. Microsatellites are lightweight, have short development cycles, are inexpensive, can be launched anytime and anywhere, and have good on-orbit mobility.
[0003] To meet the evolving needs of satellite development, the flywheel—a critical component on satellites—must possess high reliability and performance to ensure changes in the satellite's attitude in orbit. Satellite flywheels are categorized into inertia wheels, reaction wheels, momentum wheels, and offset momentum wheels. These flywheels are all driven by electric motors that power inertia disks. However, to change the spacecraft's attitude as quickly as possible, the masses and diameters of these disks are often very large. Therefore, the drive mechanism for the inertia disk, i.e., the motor, needs a high-load-bearing, high-reliability shaft system to support and drive the inertia disk. Thus, the design of the motor's shaft system has become a significant challenge in this field. Utility Model Content
[0004] In view of one of the defects in the prior art, the purpose of this application is to provide a high load-bearing capacity motor shaft system.
[0005] A first aspect of this application provides a high-load-bearing motor shaft system, comprising: a housing and a rotating shaft disposed within the housing, as well as a rear cover, a front bearing, a disc compression spring, and a rear bearing;
[0006] The rear cover is disposed at one end of the housing;
[0007] The other end of the housing is provided with a first receiving cavity, and the rear cover is provided with a second receiving cavity;
[0008] The front bearing and the disc-shaped compression spring are sleeved on one end of the rotating shaft and located within the first receiving cavity;
[0009] The rear bearing is sleeved on the other end of the rotating shaft and located in the second receiving cavity.
[0010] Optionally, the first receiving cavity and the second receiving cavity are coaxially arranged.
[0011] Optionally, the front bearing is a pair of angular contact ball bearings; the rear bearing is a deep groove ball bearing.
[0012] Optionally, one end of the disc-shaped compression spring is a small circular surface and the other end is a large circular surface. The small circular surface abuts against the inner wall of one end of the first receiving cavity, and the large circular surface abuts against one end of the front bearing.
[0013] Optionally, the high-load-bearing motor shaft system further includes a rear bearing outer ring pressure ring, which is disposed in the second receiving cavity and abuts against one end of the rear bearing.
[0014] Optionally, the rear bearing outer ring pressure ring is welded and fixed to the second receiving cavity.
[0015] Optionally, the high load-bearing capacity motor shaft system further includes an outer pressure ring of the inner ring of the front bearing, an inner pressure ring of the inner ring of the front bearing, and an outer pressure ring of the outer ring of the front bearing for fixing the front bearing;
[0016] The outer pressure ring of the inner ring of the front bearing is sleeved on the rotating shaft and abuts against the other end of the front bearing, located in the first receiving cavity;
[0017] The outer ring of the front bearing is disposed within the first receiving cavity;
[0018] The inner pressure ring of the front bearing is sleeved on the rotating shaft, located in the first receiving cavity, near one end of the disc-shaped compression spring.
[0019] Optionally, both the outer pressure ring of the inner ring of the front bearing and the inner pressure ring of the inner ring of the front bearing are welded and fixed to the rotating shaft.
[0020] Optionally, the outer ring of the front bearing is welded and fixed to the first receiving cavity.
[0021] Optionally, the high-load-bearing motor shaft system further includes a stator and a rotor, the rotor being disposed on the outer peripheral wall of the shaft, and the stator being disposed inside the housing and located outside the rotor.
[0022] This application provides a high load-bearing capacity motor shaft system. By placing the front bearing and disc spring in the first receiving cavity at one end of the housing, and the rear bearing in the second receiving cavity of the rear cover, the complex stress generated during motor operation is effectively dispersed and borne. The disc spring provides elastic support, which helps to improve the load-bearing capacity of the shaft system. It can achieve a simple motor shaft system design, has a damping function in the axial direction, and is more suitable for use in special occasions.
[0023] Other technical effects resulting from the additional features will be further illustrated in the corresponding embodiments. Attached Figure Description
[0024] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0025] Figure 1 This is a schematic diagram of a high-load-bearing capacity motor shaft system according to an exemplary embodiment;
[0026] In the diagram: 1. Housing; 2. Shaft; 3. Rear cover; 4. Front bearing; 5. Disc spring; 6. Rear bearing; 7. Inner pressure ring of the inner ring of the front bearing; 8. Outer pressure ring of the inner ring of the front bearing; 9. Outer pressure ring of the outer ring of the front bearing; 10. Outer pressure ring of the outer ring of the rear bearing; 11. Stator; 12. Rotor; 13. First receiving cavity; 14. Second receiving cavity. Detailed Implementation
[0027] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all fall within the protection scope of the present application. Parts not described in detail in the following embodiments can be implemented using existing technology.
[0028] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.
[0030] In the description of the embodiments in this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0031] The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or devices.
[0032] In existing technologies, motors in control mechanisms for changing the attitude of satellites in orbit suffer from poor buffering under certain conditions. To address this issue, this application provides a high-load-bearing motor shaft system.
[0033] Reference Figure 1 As shown in one embodiment of this application, a high load-bearing capacity motor shaft system includes: a housing 1 and a rotating shaft 2 disposed within the housing 1.
[0034] The motor shaft system also includes a rear cover 3, a front bearing 4, a disc spring 5, and a rear bearing 6. The rear cover 3 is located at one end of the housing 1; the other end of the housing 1 is provided with a first receiving cavity 13, and the rear cover 3 is provided with a second receiving cavity 14; the front bearing 4 and the disc spring 5 are sleeved on one end of the rotating shaft 2 and located in the first receiving cavity 13; the rear bearing 6 is sleeved on the other end of the rotating shaft 2 and located in the second receiving cavity 14.
[0035] Specifically, during assembly, the rear cover 3 is first installed at one end of the housing 1 to form an integral structure; then, a first receiving cavity 13 is reserved at the other end of the housing 1 away from the rear cover 3, while the rear cover 3 itself also has a second receiving cavity 14; then, the front bearing 4 and the disc spring 5 are sequentially sleeved on one end of the rotating shaft 2, and this combined structure is installed into the first receiving cavity 13 of the housing 1; finally, the rear bearing 6 is sleeved on the other end of the rotating shaft 2, and the end of the rotating shaft 2 with the rear bearing 6 is installed into the second receiving cavity 14 of the rear cover 3, thereby completing the assembly of the entire high load-bearing motor shaft system.
[0036] It should be noted that, according to the design requirements, the market shelf disc compression spring 5 product is selected for secondary processing, the elastic coefficient is measured, the required deformation is calculated, and then the dimensions of the bearing chamber (first receiving cavity 13) are designed.
[0037] In the above embodiments of this application, by installing the rear cover 3 at one end of the housing 1, and providing a first and a second receiving cavity 14 on the housing 1 and the rear cover 3 respectively, and combining the front bearing 4 and the disc spring 5 in the first receiving cavity 13, and installing the rear bearing 6 in the second receiving cavity 14, the motor can effectively disperse and bear complex stresses from different directions during operation. The elasticity of the disc spring 5 provides buffering and support, improves the bearing capacity and shock absorption capacity of the shaft system, and significantly enhances the stability of motor operation.
[0038] In some specific embodiments of this application, the first receiving cavity 13 and the second receiving cavity 14 are coaxially arranged.
[0039] In the above embodiments of this application, by coaxially arranging the first receiving cavity 13 and the second receiving cavity 14, the front bearing 4 and the rear bearing 6 sleeved at both ends of the rotating shaft 2 are on the same axis, so that the rotating shaft 2 is subjected to uniform force during operation, reducing additional friction and stress concentration caused by axis deviation, reducing wear of the rotating shaft 2 and bearings, improving the smoothness and reliability of the motor shaft system operation, and enhancing the load-bearing capacity and service life of the entire high load-bearing motor shaft system.
[0040] In some specific embodiments of this application, the front bearing 4 is a pair of angular contact ball bearings; the rear bearing 6 is a deep groove ball bearing.
[0041] Specifically, the front bearing 4 is a pair of angular contact ball bearings, and the rear bearing 6 is a deep groove ball bearing. The front bearing 4 is in the first receiving cavity 13, and the rear bearing 6 is in the second receiving cavity 14 of the rear cover 3. The rear cover 3 and the housing 1 have a high degree of assembly coaxiality, ensuring the coaxiality of the bearing chamber of the housing 1 and the bearing chamber of the rear cover 3.
[0042] In the above embodiments of this application, the overall design of the motor integrates the first receiving cavity 13 and the second receiving cavity 14 in the shaft system with the housing 1 and the rear cover 3 respectively, thereby reducing the overall size and weight of the motor and increasing the coaxiality of the motor stator 11 and rotor 12.
[0043] In some specific embodiments of this application, one end of the disc spring 5 is a small circular surface and the other end is a large circular surface. The small circular surface abuts against the inner wall of one end of the first receiving cavity 13, and the large circular surface abuts against one end of the front bearing 4.
[0044] It should be noted that the disc spring 5 is placed inside the first receiving cavity 13, with the small circular surface of the disc spring 5 contacting the bottom of the bearing chamber and the large circular surface of the disc spring 5 contacting the outer ring of the front bearing 4. Based on design requirements, a market-selected disc spring 5 is processed, its elastic coefficient is measured, the required deformation is calculated, and then the bearing chamber dimensions are designed.
[0045] In the above embodiments of this application, a disc-shaped compression spring 5 is designed in the first receiving cavity 13. Its function is to buffer the impact force on the angular contact bearing. The integrated design of the motor shaft system and the housing 1 makes the entire motor shaft system highly impact resistant. The disc-shaped compression spring 5 has a small axial dimension and occupies little space, which is conducive to the miniaturization of the motor. In addition, the disc-shaped compression spring 5 has a large elastic coefficient, and a small deformation can obtain a large elastic force.
[0046] In some specific embodiments of this application, a rear bearing outer ring pressure ring 10 is also included, which is disposed in the second receiving cavity 14 and abuts against one end of the rear bearing 6.
[0047] In the above embodiments of this application, by setting the rear bearing outer ring pressure ring 10 in the second receiving cavity 14 and abutting against one end of the rear bearing 6, the rear bearing 6 can be effectively axially positioned, preventing the rear bearing 6 from axially moving during operation, ensuring the stability between the rear bearing 6 and the rotating shaft 2 and other components, maintaining the stability of the overall structure of the motor shaft system, ensuring the smooth and reliable operation of the motor shaft system, reducing vibration, noise and wear caused by the displacement of the rear bearing 6, and extending the service life of the motor shaft system.
[0048] In some specific embodiments of this application, it also includes an outer pressure ring 8 of the inner ring of the front bearing, an inner pressure ring 7 of the inner ring of the front bearing, and an outer pressure ring 9 of the outer ring of the front bearing for fixing the front bearing; the outer pressure ring 8 of the inner ring of the front bearing is sleeved on the rotating shaft 2 and abuts against the other end of the front bearing, and is located in the first receiving cavity 13; the outer pressure ring 9 of the front bearing is disposed in the first receiving cavity 13; the inner pressure ring 7 of the inner ring of the front bearing is sleeved on the rotating shaft 2 and is located in the first receiving cavity 13, near one end of the disc-shaped compression spring 5.
[0049] Specifically, during the assembly of the motor shaft system, the front bearing is first fitted onto one end of the rotating shaft 2 and placed in the first receiving cavity 13. Then, the inner pressure ring 7 of the inner ring of the front bearing is fitted onto the rotating shaft 2 and placed close to one end of the disc spring 5. The outer pressure ring 8 of the inner ring of the front bearing is fitted onto the rotating shaft 2 and abuts against the other end of the front bearing. At the same time, the outer pressure ring 9 of the front bearing is placed in the first receiving cavity 13. The front bearing is fixed from different positions by these three pressure rings.
[0050] In the embodiments described above, the outer pressure ring 8 of the inner ring of the front bearing, the inner pressure ring 7 of the inner ring of the front bearing, and the outer pressure ring 9 of the outer ring of the front bearing work together to precisely fix the front bearing from multiple directions. This effectively prevents axial and radial displacement of the front bearing during operation, ensures the relative position stability between the front bearing and the shaft 2 and other components, reduces friction, vibration, and noise caused by the shaking of the front bearing, improves the smoothness and reliability of the motor shaft system, and thus enhances the load-bearing capacity and service life of the entire motor shaft system.
[0051] In some specific embodiments of this application, the inner pressure ring 7 of the inner ring of the front bearing, the outer pressure ring 8 of the inner ring of the front bearing, the outer pressure ring 9 of the outer ring of the front bearing, and one end of the shaft 2 are in the first receiving cavity 13, and the other end of the outer pressure ring 10 of the rear bearing and the shaft 2 are in the second receiving cavity 14, forming a rigid structure by welding.
[0052] Specifically, the front bearing inner ring outer pressure ring 8 and the front bearing inner ring inner pressure ring 7 are both welded and fixed to the rotating shaft 2; the rear bearing outer ring pressure ring 10 is welded and fixed to the second receiving cavity 14; and the front bearing outer ring pressure ring 9 is welded and fixed to the first receiving cavity 13.
[0053] It should be noted that the front bearing chamber, i.e. the first receiving cavity 13, is designed with a butterfly compression spring, which functions to buffer the impact force on the angular contact bearing. In addition, the integrated design of the motor shaft system and the housing 1 makes the entire motor shaft system highly impact resistant.
[0054] When welding the inner and outer rings of the front bearing, the bearing clearance and related dimensional tolerances are calculated, and special assembly tools are used to apply pressure to the bearing and pre-compress the disc spring 5. Welding is carried out after the pre-compression is in place.
[0055] The disc spring 5 has a certain corrective effect on the preload force when adjusting the shaft clearance, with better tolerance and less risk of damaging high-precision bearings.
[0056] Specifically, the disc spring is compressed by transmitting pressure to the outer ring of the front bearing. After reaching the compression deformation size, the front bearing is fixed by the outer ring pressure ring 9. The outer ring pressure ring 9 is welded to the first receiving cavity 13 of the housing 1. The inner ring pressure ring 7 and the outer ring pressure ring 8 of the front bearing inner ring fix the position of the front bearing inner ring. All the pressure rings of the front bearing inner ring are welded to the rotating shaft 2. The rear bearing 6 is assembled with the rear cover 3 first, and the rear bearing 6 is fixed in the second receiving cavity 14 of the rear cover 3 by the outer ring pressure ring 10. The outer ring pressure ring 10 of the rear bearing is welded to the second receiving cavity 14 of the rear cover 3.
[0057] In the above embodiment, the inner pressure ring 7 of the inner ring of the front bearing, the outer pressure ring 8 of the inner ring of the front bearing, the outer pressure ring 9 of the outer ring of the front bearing, and the outer pressure ring 10 of the outer ring of the rear bearing are welded to the rotating shaft 2, the first receiving cavity 13 of the housing 1, and the second receiving cavity 14 of the rear cover 3, respectively, to form a rigid structure that will not loosen or separate; a pair of high-precision angular contact bearings are used in the front bearing housing, which enables the shaft system to withstand greater axial force.
[0058] In some specific embodiments of this application, a stator 11 and a rotor 12 are also included. The rotor 12 is disposed on the outer peripheral wall of the rotating shaft 2, and the stator 11 is disposed inside the housing 1 and located outside the rotor 12.
[0059] The preferred features in the above embodiments can be used individually in any embodiment, or in any combination thereof, provided they do not conflict with each other. Furthermore, parts not described in detail in the embodiments can be implemented using existing technologies.
[0060] The foregoing has described some specific embodiments of this application. It should be understood that this application is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this application. The above-described preferred features can be used in any combination without conflict.
Claims
1. A high-load-bearing motor shaft system, comprising: The housing and the rotating shaft disposed within the housing are characterized in that they further include a rear cover, a front bearing, a disc spring, and a rear bearing; The rear cover is disposed at one end of the housing; The other end of the housing is provided with a first receiving cavity, and the rear cover is provided with a second receiving cavity; The front bearing and the disc-shaped compression spring are sleeved on one end of the rotating shaft and located within the first receiving cavity; The rear bearing is sleeved on the other end of the rotating shaft and located in the second receiving cavity.
2. The high load-bearing capacity motor shaft system according to claim 1, characterized in that, The first receiving cavity and the second receiving cavity are coaxially arranged.
3. A high-load-bearing capacity motor shaft system according to claim 1, characterized in that, The front bearing is a pair of angular contact ball bearings; the rear bearing is a deep groove ball bearing.
4. A high-load-bearing capacity motor shaft system according to claim 2, characterized in that, One end of the disc-shaped compression spring is a small circular surface, and the other end is a large circular surface. The small circular surface abuts against the inner wall of one end of the first receiving cavity, and the large circular surface abuts against one end of the front bearing.
5. A high-load-bearing capacity motor shaft system according to claim 4, characterized in that, It also includes a rear bearing outer ring pressure ring, which is disposed in the second receiving cavity and abuts against one end of the rear bearing.
6. A high-load-bearing capacity motor shaft system according to claim 5, characterized in that, The outer ring of the rear bearing is welded and fixed to the second receiving cavity.
7. A high-load-bearing capacity motor shaft system according to claim 5, characterized in that, It also includes an outer pressure ring for the inner ring of the front bearing, an inner pressure ring for the inner ring of the front bearing, and an outer pressure ring for the outer ring of the front bearing, for fixing the front bearing; The outer pressure ring of the inner ring of the front bearing is sleeved on the rotating shaft and abuts against the other end of the front bearing, located in the first receiving cavity; The outer ring of the front bearing is disposed within the first receiving cavity; The inner pressure ring of the front bearing is sleeved on the rotating shaft, located in the first receiving cavity, near one end of the disc-shaped compression spring.
8. A high-load-bearing capacity motor shaft system according to claim 7, characterized in that, The outer pressure ring of the inner ring of the front bearing and the inner pressure ring of the inner ring of the front bearing are both welded and fixed to the rotating shaft.
9. A high-load-bearing capacity motor shaft system according to claim 7, characterized in that, The outer ring of the front bearing is welded and fixed to the first receiving cavity.
10. A high-load-bearing motor shaft system according to claim 1, characterized in that, It also includes a stator and a rotor, the rotor being disposed on the outer peripheral wall of the shaft, and the stator being disposed inside the housing, located outside the rotor.