Bearing assembly and electric machine
By introducing a bearing retaining ring and a limiting boss into the motor bearing assembly, combined with a heat insulation cavity and a heat dissipation channel, the problems of uneven stress and heat dissipation in the bearing assembly are solved, thereby extending the life of the bearing assembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHAOQING MOTOR (SHENZHEN) CO LTD
- Filing Date
- 2025-08-19
- Publication Date
- 2026-07-21
AI Technical Summary
Existing motors fail to comprehensively consider the heat dissipation, lubrication, and uniform stress distribution of bearing components during structural design, resulting in severe bearing wear and insufficient service life.
A bearing assembly was designed, including an upper bearing component, a lower bearing component, and a bearing retaining ring. The bearing transmits force through the inner and outer retaining rings. Combined with the design of the limiting boss and the heat insulation cavity, the bearing is ensured to be subjected to uniform force, and heat is dissipated through heat dissipation channels and heat dissipation vents.
It improves the service life of bearing assemblies, reduces wear of rolling elements and glue shedding, lowers the heat of bearing assemblies, and extends the service life of bearings.
Smart Images
Figure CN224537920U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of bearing technology, specifically to a bearing assembly and a motor. Background Technology
[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction, or converts one form of electrical energy into another. An electric motor generally includes a housing, a stator assembly, a rotor assembly, and a shaft. The rotor assembly rotates relative to the stator assembly via the shaft, and bearings are typically used to reduce rotational friction.
[0003] During high-speed operation, motors require specific conditions for bearing components, including heat dissipation, lubrication, and uniform stress distribution, to minimize bearing wear. However, existing motor designs do not comprehensively consider these wear factors, resulting in bearing components failing to achieve their expected service life. Utility Model Content
[0004] To address the aforementioned issues, this application provides a bearing assembly and a motor that improves the service life of the bearing assembly by comprehensively considering factors such as heat dissipation, lubrication, and uniform force distribution.
[0005] According to a first aspect of this application, a bearing assembly is provided for supporting a rotor assembly and connecting a stator assembly, including an upper bearing member, a lower bearing member, and a bearing retaining ring disposed between the upper bearing member and the lower bearing member.
[0006] The bearing retaining ring includes an inner bearing retaining ring and an outer bearing retaining ring. The inner bearing retaining ring is sleeved on the outer ring of the central shaft of the rotor assembly, and the outer bearing retaining ring is embedded in the inner ring of the stator assembly.
[0007] The inner and outer retaining rings of the bearing are used to transmit force between the two sides of the upper and lower bearing components.
[0008] Preferably, both the upper bearing component and the lower bearing component include an inner bearing ring, an outer bearing ring, and a rolling element connecting the inner bearing ring and the outer bearing ring;
[0009] The inner retaining ring and the outer retaining ring of the bearing respectively abut against the upper and lower inner rings and outer rings of the bearing.
[0010] Preferably, it further includes a sealing sleeve, which is disposed between the inner ring and the outer ring of the bearing for sealing the rolling element.
[0011] According to a second aspect of this application, an electric motor is provided, comprising a rotor assembly, a stator assembly, and a bearing assembly as described above;
[0012] The rotor assembly includes a central shaft, the inner ring of the bearing and the inner retaining ring of the bearing are sleeved on the outer ring of the central shaft, and the outer ring of the bearing and the outer retaining ring of the bearing are embedded in the inner ring of the stator assembly.
[0013] Preferably, the outer ring of the central shaft is provided with a first limiting boss at its top, and the first limiting boss is in limiting engagement with the inner ring of the bearing of the upper bearing component;
[0014] The top of the inner ring of the stator assembly is provided with a second limiting boss, which is matched with the outer ring of the bearing of the upper bearing component.
[0015] Preferably, it also includes windings distributed on the outer ring of the stator assembly;
[0016] The stator assembly has an internal hollow structure and forms a heat insulation cavity.
[0017] Preferably, the rotor assembly has a heat dissipation port on its outer periphery, and a heat dissipation channel is formed between the rotor assembly and the stator assembly inside. The top of the heat insulation cavity is open, and the heat insulation cavity communicates with the heat dissipation port through the heat dissipation channel.
[0018] Preferably, the two side walls of the heat insulation cavity are at least partially connected by reinforcing ribs.
[0019] Preferably, multiple reinforcing ribs are arranged circumferentially within the heat insulation cavity.
[0020] Preferably, the rotor assembly has a rotating fixed end at its top.
[0021] Compared with the prior art, the beneficial results of this application are as follows:
[0022] (1) A bearing retaining ring is provided between the upper bearing component and the lower bearing component. The bearing retaining ring includes an inner bearing retaining ring and an outer bearing retaining ring, which can transmit force between the two sides of the upper bearing component and the lower bearing component respectively. When the bearing assembly is under force, the force transmitted from the lower bearing component to the upper bearing component is more uniform, thereby reducing the bearing swing amplitude, thereby reducing the wear of the rolling elements and the shedding of the adhesive, and improving the service life of the bearing assembly.
[0023] (2) The outer ring of the central shaft of the rotor assembly is provided with a first limiting boss, and the inner ring of the stator assembly is provided with a second limiting boss. When the bearing assembly is subjected to force, the lower bearing component transmits the force to the upper bearing component. The first limiting boss and the second limiting boss limit the two sides of the upper bearing component respectively, so that the bearing assembly is subjected to force more evenly, thereby reducing the bearing swing, and thus reducing the wear of the rolling elements and the shedding of the adhesive, and improving the service life of the bearing assembly.
[0024] (3) A heat insulation cavity is opened inside the stator assembly to isolate the bearing assembly from the winding and to dissipate heat through heat dissipation channels and heat dissipation ports. This can reduce the heat of the bearing assembly, thereby reducing the loss or thickening of internal grease and the resulting reduction in rolling element lubrication, thus reducing the wear rate of the rolling elements and improving the service life of the bearing assembly. Attached Figure Description
[0025] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of this application. Other embodiments and many anticipated advantages of these embodiments will be readily recognized as they become better understood through reference to the following detailed description. Elements in the drawings are not necessarily to scale. The same reference numerals refer to corresponding similar parts.
[0026] Figure 1 This is a schematic diagram of the structure of a motor according to a specific embodiment of this application;
[0027] Figure 2 This is an exploded structural diagram of a motor according to a specific embodiment of this application;
[0028] Figure 3 This is a partial structural cross-sectional view of a motor according to a specific embodiment of this application;
[0029] Figure 4 yes Figure 3 Enlarged view of point A in the middle.
[0030] The meaning of each number in the diagram:
[0031] 100. Electric motor;
[0032] 10. Rotor assembly; 11. Rotating fixed end; 12. Central shaft; 121. First limiting boss; 13. Heat dissipation vent; 14. Heat dissipation channel;
[0033] 20. Bearing assembly; 21. Upper bearing component; 211. Bearing inner ring; 212. Bearing outer ring; 213. Rolling element; 214. Sealing sleeve; 22. Lower bearing component; 23. Bearing retaining ring; 231. Bearing inner retaining ring; 232. Bearing outer retaining ring;
[0034] 30. Stator assembly; 31. Second limiting boss; 32. Heat insulation cavity; 33. Reinforcing rib;
[0035] 40. Magnetic retaining ring;
[0036] 50. Magnet;
[0037] 60. Winding retainer rings;
[0038] 70. Winding;
[0039] 80. Rotor mounting base;
[0040] 90. Dust cover. Detailed Implementation
[0041] In the following detailed description, reference is made to the accompanying drawings, which form part of the detailed description and illustrate illustrative specific embodiments in which the present application may be practiced. In this regard, directional terms such as “top,” “bottom,” “left,” “right,” “up,” “down,” etc., are used with reference to the orientation of the described figures. Because components of the embodiments can be positioned in several different orientations, directional terms are used for illustrative purposes and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present application. Therefore, the following detailed description should not be taken in a limiting sense, and the scope of the present application is defined by the appended claims.
[0042] This application discloses a bearing assembly and a motor. The specific structure of the bearing assembly and motor according to embodiments of this application will be described below with reference to the accompanying drawings.
[0043] Reference Figures 1-4 This application discloses an electric motor 100, which includes a rotor assembly 10, a bearing assembly 20, a stator assembly 30, a magnet retaining ring 40, a magnet 50, a winding retaining seat 60, a winding 70, a rotor retaining seat 80, and a dust cover 90. The rotor assembly 10 has a rotating fixed end 11 at its upper end and a central shaft 12 at its lower end. The inner ring of the bearing assembly 20 is glued and fixedly fitted onto the outer ring of the central shaft 12, and the outer ring of the bearing assembly 20 is glued and fixedly embedded into the inner ring of the stator assembly 30. The magnet retaining ring 40, the magnet 50, the winding retaining seat 60, and the winding 70 are arranged sequentially from the outside to the inside between the rotor assembly 10 and the stator assembly 30. The rotor retaining seat 80 is fixed to the lower end of the central shaft 12 by bolts. The dust cover 90 is embedded in the stator assembly 30 below the rotor retaining seat 80 to seal the entire bearing assembly 20.
[0044] When the stator assembly 30 is energized, the stator assembly 30 generates a magnetic field. The magnetic field generated by the rotor assembly 10 interacts with the magnetic field generated by the stator assembly 30, causing the rotor assembly 10 to rotate relative to the stator assembly 30 through the bearing assembly 20. Thus, the external load can be driven to run through the rotating fixed end 11 of the rotor assembly 10.
[0045] In this embodiment, the rotating fixed end 11 of the rotor assembly 10 is used to connect with the propeller on the UAV, driving the propeller to rotate at high speed.
[0046] Continue to refer to Figures 2-4 The bearing assembly 20 includes an upper bearing component 21, a lower bearing component 22, and a bearing retaining ring 23 disposed between the upper bearing component 21 and the lower bearing component 22. Both the upper bearing component 21 and the lower bearing component 22 include an inner bearing ring 211, an outer bearing ring 212, and rolling elements 213 (steel balls) connecting the inner and outer bearing rings 211 and 212. The bearing retaining ring 23 includes an inner bearing retaining ring 231 and an outer bearing retaining ring 232, which respectively abut against the upper and lower inner bearing rings 211 and outer bearing rings 212. The upper and lower inner bearing rings 211 and inner bearing retaining rings 231 are glued and fixedly fitted onto the outer ring of the central shaft 12, and the upper and lower outer bearing rings 212 and outer bearing retaining rings 232 are glued and fixedly embedded into the inner ring of the stator assembly 30.
[0047] When the motor 100 drives the propellers on the drone to rotate at high speed, the rotor assembly 10 generates an upward lift force, which causes the bearing assembly 20 to tend to move upward. Since the inner retaining ring 231 and the outer retaining ring 232 of the bearing can transmit force between the two sides of the upper bearing 21 and the lower bearing 22 respectively, the force transmitted from the lower bearing 22 to the upper bearing 21 is more even, thereby reducing the swing amplitude of the bearing assembly 20, which in turn reduces the wear of the rolling elements 213 and the shedding of adhesive, and improves the service life of the bearing assembly 20.
[0048] Continue to refer to Figure 3 and Figure 4 In one specific embodiment, both the upper bearing component 21 and the lower bearing component 22 further include a sealing sleeve 214, which is disposed between the inner ring 211 and the outer ring 212 of the bearing and is used to seal the rolling element 213 to prevent dust and liquid from entering.
[0049] Continue to refer to Figure 3 and Figure 4In one specific embodiment, a first limiting boss 121 is provided on the top of the outer ring of the central shaft 12, and the first limiting boss 121 is in limiting engagement with the inner ring 211 of the upper bearing component 21. A second limiting boss 31 is provided on the top of the inner ring of the stator assembly 30, and the second limiting boss 31 is in limiting engagement with the outer ring 212 of the upper bearing component 21.
[0050] When the bearing assembly 20 is subjected to an upward lifting force, the first limiting boss 121 and the second limiting boss 31 can respectively limit the two sides of the upper bearing 21, making the bearing assembly 20 more evenly stressed, thereby further reducing the swing amplitude of the bearing assembly 20, and thus reducing the wear of the rolling element 213 and the shedding of the adhesive, and improving the service life of the bearing assembly 20.
[0051] Continue to refer to Figure 3 In one specific embodiment, the stator assembly 30 has an internal hollow structure and forms a heat insulation cavity 32, with an opening at the top of the heat insulation cavity 32. The outer periphery of the rotor assembly 10 is provided with a plurality of heat dissipation ports 13 spaced apart, and a heat dissipation channel 14 is formed between the rotor assembly 10 and the stator assembly 30, through which the heat insulation cavity 32 communicates with the heat dissipation ports 13.
[0052] The heat insulation cavity 32 can isolate the bearing assembly 20 from the winding 70, and heat dissipation is achieved through the heat dissipation channel 14 and the heat dissipation port 13, thereby reducing the heat of the bearing assembly 20, reducing the loss or thickening of grease inside the bearing assembly 20, reducing the lubrication of the rolling element 213, thereby reducing the wear rate of the rolling element 213 and improving the service life of the bearing assembly 20.
[0053] Continue to refer to Figure 3 In one specific embodiment, at least a reinforcing rib 33 is provided between the two side walls of the heat insulation cavity 32. By providing the reinforcing rib 33, the structural strength of the stator assembly 30 can be improved.
[0054] In this embodiment, multiple reinforcing ribs 30 are arranged circumferentially within the heat insulation cavity 32.
[0055] In this embodiment, the height of the reinforcing rib 30 is half the height of the stator assembly 30 cavity wall. The incomplete setting of the reinforcing rib 30 allows for a larger heat dissipation space in the heat insulation cavity 32, resulting in better heat dissipation and also reducing weight.
[0056] It is understood that in other embodiments, the height of the reinforcing rib can also be set to 1 / 1, 3 / 4, 1 / 3, 1 / 4, etc. of the height of the stator assembly cavity wall, and there is no limitation here.
[0057] In summary, the bearing assembly 20 and motor 100 proposed in this application achieve the following beneficial effects:
[0058] By setting a bearing retaining ring 23 between the upper bearing component 21 and the lower bearing component 22, and by setting a first limiting boss 121 on the outer ring of the central shaft 12 of the rotor assembly 10 and a second limiting boss 31 on the inner ring of the stator assembly 30, when the bearing assembly 20 is subjected to an upward lifting force, the lower bearing component 22 transmits the force evenly to the upper bearing component 21 through the bearing retaining ring 23. The upper bearing component 21 then transmits the force evenly to the stator assembly 30 through its cooperation with the first limiting boss 121 and the second limiting boss 31. As a result, the bearing assembly 20 is subjected to a more uniform force, which can reduce the swing amplitude of the bearing assembly 20, thereby reducing the wear of the rolling elements 213 and the shedding of the adhesive, and improving the service life of the bearing assembly 20.
[0059] The stator assembly 30 has a heat insulation cavity 32 inside, which isolates the bearing assembly 20 from the winding 70 and dissipates heat through the heat dissipation channel 14 and heat dissipation port 13. This can reduce the heat of the bearing assembly 20, thereby reducing the loss or thickening of grease inside the bearing assembly 20, which leads to reduced lubrication of the rolling element 213, thereby reducing the wear rate of the rolling element 213 and improving the service life of the bearing assembly 20.
[0060] It is obvious that those skilled in the art can make various modifications and alterations to the embodiments of this application without departing from the spirit and scope of this application. In this way, this application also aims to cover such modifications and alterations if they fall within the scope of the claims and their equivalents. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are described in mutually different dependent claims does not indicate that a combination of these measures cannot be used for profit. Any reference numerals in the claims should not be considered limiting in scope.
Claims
1. A bearing assembly for supporting a rotor assembly and connecting to a stator assembly, characterized in that, It includes an upper bearing component, a lower bearing component, and a bearing retaining ring disposed between the upper bearing component and the lower bearing component; The bearing retaining ring includes an inner bearing retaining ring and an outer bearing retaining ring. The inner bearing retaining ring is sleeved on the outer ring of the central shaft of the rotor assembly, and the outer bearing retaining ring is embedded in the inner ring of the stator assembly. The inner and outer retaining rings of the bearing are used to transmit force between the two sides of the upper and lower bearing components.
2. The bearing assembly according to claim 1, characterized in that, Both the upper bearing component and the lower bearing component include an inner bearing ring, an outer bearing ring, and rolling elements connecting the inner bearing ring and the outer bearing ring; The inner retaining ring and the outer retaining ring of the bearing respectively abut against the upper and lower inner rings and outer rings of the bearing.
3. The bearing assembly according to claim 2, characterized in that, It also includes a sealing sleeve, which is disposed between the inner ring and the outer ring of the bearing and is used to seal the rolling element.
4. An electric motor, characterized in that, Includes a rotor assembly, a stator assembly, and a bearing assembly as described in any one of claims 1-3; The rotor assembly includes a central shaft, the inner ring of the bearing and the inner retaining ring of the bearing are sleeved on the outer ring of the central shaft, and the outer ring of the bearing and the outer retaining ring of the bearing are embedded in the inner ring of the stator assembly.
5. The motor according to claim 4, characterized in that, The outer ring of the central shaft is provided with a first limiting boss at its top, and the first limiting boss is in limiting engagement with the inner ring of the bearing of the upper bearing component. The top of the inner ring of the stator assembly is provided with a second limiting boss, which is matched with the outer ring of the bearing of the upper bearing component.
6. The motor according to claim 4, characterized in that, It also includes windings distributed around the outer ring of the stator assembly; The stator assembly has an internal hollow structure and forms a heat insulation cavity.
7. The motor according to claim 6, characterized in that, The rotor assembly has a heat dissipation port on its outer periphery, and a heat dissipation channel is formed between the rotor assembly and the stator assembly inside. The heat insulation cavity has an opening at the top, and the heat insulation cavity communicates with the heat dissipation port through the heat dissipation channel.
8. The motor according to claim 6, characterized in that, The insulation cavity is at least partially connected to the two side walls by reinforcing ribs.
9. The motor according to claim 8, characterized in that, The reinforcing ribs are arranged circumferentially at intervals within the heat insulation cavity.
10. The motor according to claim 4, characterized in that, The rotor assembly has a rotating fixed end at its top.