Ultra-long-life brushless motor for unmanned aerial vehicle
By introducing bearing buffer components into brushless motors for drones, bearing wear problems are solved, achieving longer service life and lower maintenance costs.
Patent Information
- Application Number
- CN202422381249.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-29
AI Technical Summary
The bearings of existing brushless motors for drones cannot effectively absorb mechanical stress when impacted or vibration, resulting in increased wear and affecting operation stability and life.
Bearing cushioning components are adopted, including cushion sleeves, elastic pads and cushioning springs, which absorb external shocks and vibrations through adaptive adjustments to reduce bearing wear.
It effectively extends the service life of the bearing, reduces maintenance costs, and improves the operating stability and accuracy of the motor.
Smart Images
Figure CN223141689U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of brushless motors, and particularly relates to an ultra-long-life brushless motor for an unmanned aerial vehicle (UAV). Background Art
[0002] A brushless motor for a UAV is an efficient, precise and durable motor applied to the power system of a UAV. The brushless motor switches the current direction through an electronic control method and does not require mechanical brushes and a commutator. The brushless motor for a UAV includes a motor housing, a motor rotating shaft penetrating through the motor stator assembly, a magnet bracket, a motor end cover, a motor stator assembly, and bearings sleeved at both ends of the motor rotating shaft. In the existing technology, the bearings are directly sleeved on the motor rotating shaft. When the motor is subjected to large impacts or vibrations, the bearings cannot well absorb these mechanical stresses, resulting in increased wear between the bearings and the motor rotating shaft, affecting the overall running stability, reducing the running precision of the motor, and generating relatively large noise, thus greatly shortening the service life of the motor. Summary of the Utility Model
[0003] To solve the above problems, the technical problem to be solved by the utility model is to provide an ultra-long-life brushless motor for a UAV.
[0004] The technical solution adopted by the ultra-long-life brushless motor for a UAV of the utility model is characterized in that it includes a motor housing, a stator assembly arranged in the motor housing, a motor bracket and a motor end cover arranged at both ends of the stator assembly, a motor rotating shaft penetrating through the stator assembly, a first bearing and a second bearing sleeved at both ends of the motor rotating shaft, and a bearing buffer assembly sleeved outside the second bearing. The bearing buffer assembly includes a buffer sleeve, elastic cushion blocks and buffer springs. The motor end cover includes an end cover body and an end cover cylinder penetrating through the stator assembly. A first end cover positioning groove for positioning the buffer sleeve is arranged in the end cover body. An end cover through hole for the motor rotating shaft to penetrate through and communicating with the first end cover positioning groove is arranged in the end cover cylinder.
[0005] The elastic cushion blocks are sleeved outside the second bearing at intervals around an arc and are arranged inside the buffer sleeve. An arc-shaped cushion fitting surface in contact with the second bearing is arranged on the inner side of the elastic cushion blocks. A spring receiving surface is arranged in the middle of the outer side of the elastic cushion blocks. A buffer sleeve positioning hole is arranged on the buffer sleeve. The buffer spring penetrates through the buffer sleeve positioning hole, with one end abutted against the spring receiving surface and the other end abutted against the side wall of the first end cover positioning groove.
[0006] It further includes a cover, within which there is a cover relief hole for the motor rotating shaft to pass through. Around the arc of the cover, there are cover clamping blocks arranged at intervals. On the end cover body, there is an end cover border outside the first positioning groove of the end cover, and on the end cover border, there are end cover border clamping openings that are clamped with the cover clamping blocks.
[0007] The number of both the elastic cushion blocks and the buffer springs is 3.
[0008] On the spring bearing surface, there is a spring limit seat, and within the spring limit seat, there is a spring limit hole for limiting the buffer spring.
[0009] The elastic cushion block is made of rubber material.
[0010] The advantages of the ultra-long-life brushless motor for the UAV of the present utility model are as follows: The bearing buffer assembly can adaptively adjust according to external impact force and vibration, making the motor rotating shaft and the second bearing maintain relative stability, reducing excessive friction and wear between the motor rotating shaft and the second bearing, effectively extending the bearing life, and reducing the maintenance cost. Description of the Drawings
[0011] The following further elaborates on the present utility model in detail in conjunction with the drawings and specific embodiments.
[0012] Figure 1 is the structural schematic diagram of the ultra-long-life brushless motor for the UAV of the present utility model;
[0013] Figure 2 is the exploded view of the ultra-long-life brushless motor for the UAV of the present utility model;
[0014] Figure 3 is the structural schematic diagram of the motor end cover of the present utility model;
[0015] Figure 4 is the structural schematic diagram of the bearing buffer assembly of the present utility model;
[0016] Figure 5 is the structural schematic diagram of the buffer sleeve of the present utility model;
[0017] Figure 6 is the structural schematic diagram of the elastic cushion block of the present utility model;
[0018] Figure 7 is the structural schematic diagram of the cover of the present utility model. Specific Embodiments
[0019] Such as Figure 1-7As shown in the figure, the ultra-long-life brushless motor for drones involved in the present utility model includes a motor housing 1, a stator assembly 2 provided inside the motor housing 1, a motor bracket 3 and a motor end cover 4 provided at both ends of the stator assembly 2, a motor rotating shaft 5 passing through the stator assembly 2, a first bearing 6 and a second bearing 7 sleeved at both ends of the motor rotating shaft 5, and a bearing buffer assembly 8 sleeved outside the second bearing 7. The bearing buffer assembly 8 includes a buffer sleeve 12, an elastic cushion block 13 and a buffer spring 14. The motor end cover 4 includes an end cover body 16 and an end cover cylinder 17 passing through the stator assembly 2. A first end cover positioning groove 18 for positioning the buffer sleeve 12 is provided inside the end cover body 16, and an end cover through hole 19 for the motor rotating shaft 5 to pass through and communicating with the first end cover positioning groove 18 is provided inside the end cover cylinder 17. The elastic cushion blocks 13 are sleeved outside the second bearing 7 at intervals around an arc and are placed inside the buffer sleeve 12. An arc-shaped cushion fitting surface 21 in contact with the second bearing 7 is provided on the inner side of the elastic cushion block 13, and a spring receiving surface 22 is provided in the middle of the outer side of the elastic cushion block 13. A buffer sleeve positioning hole 23 is provided on the buffer sleeve 12. The buffer spring 14 passes through the buffer sleeve positioning hole 23, one end of which abuts against the spring receiving surface 22 and the other end of which abuts against the side wall of the first end cover positioning groove 18. The bearing buffer assembly 8 can effectively absorb and relieve the force of external impact and vibration transmitted to the bearing, reduce the direct impact borne by the second bearing, and extend the service life of the second bearing and the overall motor. The use of the elastic cushion block 13 and the buffer spring 14 can effectively isolate or absorb the minute vibration generated during the operation of the motor, and prevent the vibration from being directly transmitted to the motor housing through the second bearing.
[0020] It further includes a sealing cover 9. A cover relieving hole 25 for the motor rotating shaft 5 to pass through is provided inside the sealing cover 9. Cover clamping blocks 26 are provided at intervals around an arc outside the sealing cover 9. An end cover border 27 is provided outside the first end cover positioning groove 18 on the end cover body 16. An end cover border bayonet 28 engaged with the cover clamping blocks 26 is provided on the end cover border 27, which is convenient for the installation and disassembly of the bearing buffer assembly 8 and plays a protective role for the bearing buffer assembly 8.
[0021] The number of the elastic cushion blocks 13 and the buffer springs 14 is 3 each, making the impact force conduction more stable and the force more balanced.
[0022] A spring limit seat 30 is provided on the spring receiving surface 22, and a spring limit hole 31 for limiting the buffer spring 14 is provided inside the spring limit seat 30, making the action direction of the buffer spring 14 more accurate, the action more reliable and not prone to displacement or falling off.
[0023] The elastic cushion block 13 is made of rubber material, reducing the wear on the second bearing.
[0024] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model are all included within the protection scope of the present utility model.
Claims
1. An ultra-long-life brushless motor for a drone, characterized in that: It includes a motor housing (1), a stator assembly (2) disposed within the motor housing (1), motor brackets (3) and motor end covers (4) disposed at both ends of the stator assembly (2), a motor shaft (5) passing through the stator assembly (2), a first bearing (6) and a second bearing (7) sleeved at both ends of the motor shaft (5), and a bearing buffer assembly (8) sleeved outside the second bearing (7). The bearing buffer assembly (8) includes a buffer sleeve (12), elastic cushion blocks (13) and buffer springs (14). The motor end cover (4) includes an end cover body (16) and an end cover cylinder (17) passing through the stator assembly (2). A first end cover positioning groove (18) for positioning the buffer sleeve (12) is provided within the end cover body (16). An end cover through hole (19) for the motor shaft (5) to pass through and communicating with the first end cover positioning groove (18) is provided within the end cover cylinder (17). The elastic cushion blocks (13) are sleeved outside the second bearing (7) at intervals around an arc and are disposed within the buffer sleeve (12). A cushion block arc fitting surface (21) in contact with the second bearing (7) is provided on the inner side of the elastic cushion blocks (13). A spring receiving surface (22) is provided in the middle of the outer side of the elastic cushion blocks (13). A buffer sleeve positioning hole (23) is provided on the buffer sleeve (12). The buffer spring (14) passes through the buffer sleeve positioning hole (23), with one end abutting against the spring receiving surface (22) and the other end abutting against the side wall of the first end cover positioning groove (18).
2. The brushless motor with ultra-long service life for drones according to claim 1, wherein: It further includes a cover (9). A cover relief hole (25) for the motor shaft (5) to pass through is provided within the cover (9). Cover catch blocks (26) are provided at intervals around an arc outside the cover (9). An end cover border (27) is provided outside the first end cover positioning groove (18) on the end cover body (16). An end cover border bayonet (28) for engaging with the cover catch blocks (26) is provided on the end cover border (27).
3. The brushless motor with ultra-long service life for drones according to claim 1, wherein: The number of both the elastic cushion blocks (13) and the buffer springs (14) is three.
4. The brushless motor with ultra-long service life for drones according to claim 1, characterized in that: A spring limit seat (30) is provided on the spring receiving surface (22). A spring limit hole (31) for limiting the buffer spring (14) is provided within the spring limit seat (30).
5. The brushless motor with ultra-long service life for unmanned aerial vehicles according to claim 1, characterized in that: The elastic cushion blocks (13) are made of rubber material.