Bearing system applied to power heavy-load motor of unmanned aerial vehicle

Abstract

The invention discloses a bearing system applied to a power heavy-load motor of an unmanned aerial vehicle, which comprises a central shaft, a stator assembly and a bearing assembly, and is characterized in that the stator assembly comprises an external rotation stator seat, and the central shaft is arranged in a central hole of the external rotation stator seat in a penetrating manner; the bearing assembly comprises a top bearing, a bottom bearing and a shaft sleeve, the top bearing and the bottom bearing are arranged on the center shaft in a sleeving mode, the outer side wall of the top bearing and the outer side wall of the bottom bearing are tightly attached to the inner side wall of the center hole of the outer rotor stator base, the center shaft is sleeved with the shaft sleeve, and the two ends of the shaft sleeve are connected with the top bearing and the bottom bearing respectively. The top bearing, the bottom bearing and the shaft sleeve jointly act on the center shaft, that is, the shaft sleeve is added between the two bearings, the axial tension load applied to the motor rotor by the propeller is distributed to the two bearings to be jointly borne, the load of the bearings is reduced, and the service life of the bearings is effectively prolonged; the reliability of the motor can be effectively improved, and the requirement for light weight of the motor can be met.

Description

Technical Field

[0001] The present invention relates to the field of unmanned aerial vehicle power systems, and in particular to a bearing system used in a heavy-duty motor for unmanned aerial vehicle power. Background Art

[0002] With the rapid development of the electric drone industry, the development of the industry has continuously promoted the advancement of drone power technology. As one of the most important components of the drone power system, the motor has higher requirements for its reliability, life, load and weight. The bearing system of the drone motor has an important impact on the motor performance, especially for heavy-load motors.

[0003] When a heavy-loaded drone is flying, due to the requirements of heavy-load applications, the motor load is very large, which can reach hundreds of kilograms. The motor bearing will be subjected to very large axial tension. The general practice is to use larger bearings to increase the axial tension of the bearings, but this will bring a larger motor weight and a larger space occupation, which will bring very large disadvantages to the total weight and heat dissipation of the motor. At the same time, heavy-loaded motors need to bear a larger load, which requires larger blades, which will bring greater radial deflection force, make the motor use condition worse, and reduce the motor life. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a bearing system for a heavy-duty motor used in a UAV. Under high-load conditions, the motor reliability can be effectively improved and its service life can be extended while meeting the demand for lightweight motors.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A bearing system for a heavy-duty motor for a drone, comprising: a central shaft, a stator assembly and a bearing assembly.

[0007] The stator assembly includes an outer rotating stator seat, and the central axis is arranged in a central hole of the outer rotating stator seat;

[0008] The bearing assembly includes a top bearing, a bottom bearing and a sleeve. The top bearing and the bottom bearing are respectively sleeved on the central shaft, and the outer side wall of the top bearing and the outer side wall of the bottom bearing are tightly attached to the inner side wall of the central hole of the outer rotor stator seat. The sleeve is sleeved on the central shaft, and the two ends of the sleeve are respectively connected to the top bearing and the bottom bearing.

[0009] In one of the embodiments, a bearing fixing channel is provided between the central shaft and the central hole of the outer rotor stator seat, and the top bearing, the bottom bearing, and the bushing are respectively provided in the bearing fixing channel.

[0010] In one embodiment, the bottom bearing is arranged at the bottom of the bearing fixing channel, the sleeve is accommodated in the bearing fixing channel, and one end of the sleeve is used to support the outer wall of the bottom bearing away from the bottom of the bearing fixing channel, and the top bearing is pressed on the end of the sleeve away from the abutment against the bottom bearing.

[0011] In one embodiment, the bearing assembly also includes a bearing locking mechanism, a mounting hole is formed on the bearing locking mechanism, the center axis is passed through the mounting hole, a first bearing clamping area is provided between the bearing locking mechanism and the sleeve, and the bearing locking mechanism and the sleeve clamp the top bearing in the first bearing clamping area to prevent the top bearing from axial movement.

[0012] In one of the embodiments, the bearing locking mechanism is connected to the outer rotor stator seat via threads.

[0013] In one embodiment, an inner wall of the center hole of the outer rotating stator seat is provided with an internal thread, and an external thread is provided on the bearing locking mechanism. The external thread of the bearing locking mechanism is threadedly connected with the internal thread of the outer rotating stator seat.

[0014] In one embodiment, the bearing system further includes a rotor assembly and a rear end cover, wherein the rotor assembly is rotatably disposed on the central shaft, and the rear end cover is mounted on the rotor assembly.

[0015] In one embodiment, the bearing assembly further comprises a large rear cover bearing, the rear end cover is provided with a bearing fixing hole, the large rear cover bearing is arranged in the bearing fixing hole, and the large rear cover bearing sleeve is placed outside the outer rotor stator seat.

[0016] In one of the embodiments, the bearing assembly further comprises a bearing locking washer, the bearing locking washer is fixed on the central shaft, and the bearing locking washer is used to lock the bottom bearing on the central shaft.

[0017] In one of the embodiments, a second bearing clamping area is provided between the bearing locking washer and the shaft sleeve, and the bearing locking washer and the shaft sleeve clamp the bottom bearing in the second bearing clamping area.

[0018] The advantages and beneficial effects of the present invention compared to the prior art are as follows:

[0019] 1. The present invention is a bearing system for a heavy-duty motor for unmanned aerial vehicle power. A top bearing, a bottom bearing and a bushing are arranged to act together on the central axis, that is, a bushing is added between the two bearings to distribute the axial tensile load applied by the propeller to the motor rotor to be shared by the two bearings, thereby reducing the bearing load and effectively extending the bearing life. Under heavy-duty motor high-load conditions, the motor reliability can be effectively improved and the service life can be extended, while also meeting the demand for lightweight motors.

[0020] 2. The bearing system of the present invention is provided with a bearing locking mechanism, which can ensure that the inner and outer rings of the bearing do not axially offset by limiting the outer ring of the bearing, reduce the wear of the bearing raceway and the ball, effectively extend the life of the bearing, and solve the sliding failure of the outer ring of the bearing.

[0021] 3. The present invention utilizes the reinforced design of the large bearing of the rear cover to form a closed rotor structure. Compared with the conventional open rotor structure, the load resistance of the motor rotor in both the axial and radial directions is enhanced, thereby effectively improving the reliability and service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a bearing system applied to a heavy-load motor for UAV power according to one embodiment of the present invention;

[0023] Figure 2 for Figure 1 A structural diagram of a bearing system for a heavy-duty motor for a UAV power plant according to another embodiment shown;

[0024] Figure 3 for Figure 1 A structural diagram of a bearing system applied to a heavy-load motor for a UAV power according to another embodiment is shown;

[0025] Figure 4 for Figure 1 The structure diagram of the bearing locking gasket used in the bearing system of the heavy-load motor for UAV power is shown. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0027] At present, the reliability of the motor is poor under heavy load, mainly because the bearing is easy to pull off and collapse under heavy load, causing damage to the motor; the motor has a short life under heavy load, mainly because the blades are large under heavy load conditions, which will bring about a large radial deflection force, causing the bearing to be easily worn and shortening its life. Moreover, heavy-duty motors are relatively rare on the market, mainly because bearings of appropriate size cannot withstand large loads; drones have more stringent requirements on the deadweight of the motor itself under heavy load conditions, and it is urgent to design heavy-duty motors with lightweight. Based on this, the present invention provides a bearing system for drone power heavy-duty motors, which can optimize the force of the bearings, and replace the axial force borne by a bearing at the bottom of an ordinary motor with a shaft sleeve between two small bearings, so that the two bearings are connected as a whole, so that the axial force borne by the motor bearing is shared by the two bearings, each bearing half of the axial force, and at the same time, a certain axial force can also be shared through the shaft sleeve. In addition, the upper bearing is connected to the bearing seat as a whole with a locking mechanism to prevent the bearing from falling out and failing. It should also be noted that adding a large bearing to the rear cover allows the rear cover to rotate with the rotor, which increases the stability of the motor operation, reduces the impact of the axial deflection force of the blades on the motor bearings, and further improves reliability.

[0028] Specifically, see Figure 1 to Figure 4 A bearing system for a heavy-load motor for a UAV power plant includes a central shaft 100, a stator assembly 200, and a bearing assembly. In this embodiment, the central shaft 100 is a stepped shaft.

[0029] The structural layout of the bearing system of the present invention not only ensures efficient and stable power transmission, but also greatly improves the load-bearing capacity and operational reliability of the UAV. The central shaft adopts a stepped shaft design, which not only facilitates precise docking with other components, but also effectively disperses stress and enhances the overall stability of the structure. The central shaft runs through the center hole of the outer rotor stator seat of the stator assembly, and the precise fit between the two enables the motor to operate efficiently.

[0030] The stator assembly 200 includes an outer rotating stator seat 210, and the central axis 100 is passed through the central hole of the outer rotating stator seat 210; it should be noted that the outer rotating stator seat 210 is not only used to bear the central axis, but also fits tightly with the bearing assembly.

[0031] The bearing assembly includes a top bearing 310, a bottom bearing 320 and a sleeve 330. The top bearing and the bottom bearing are respectively sleeved on the central shaft, and the outer side wall of the top bearing and the outer side wall of the bottom bearing are tightly attached to the inner side wall of the center hole of the outer rotating stator seat. The sleeve is sleeved on the central shaft, and the two ends of the sleeve are respectively connected to the top bearing and the bottom bearing. It should be noted that the top bearing and the bottom bearing are respectively sleeved on the upper and lower ends of the central shaft, and their outer side walls are tightly attached to the inner side wall of the center hole of the outer rotating stator seat, which can not only reduce friction loss, but also significantly improve the rotation accuracy and stability of the bearing system. The sleeve, as a bridge connecting the top bearing and the bottom bearing, is sleeved on the central shaft, and its two ends are tightly connected to the top bearing and the bottom bearing, respectively, forming a stable and flexible support structure, which effectively disperses the axial and radial loads during the operation of the motor and ensures the smooth and efficient power transmission.

[0032] In this way, by arranging the top bearing, the bottom bearing, and the bushing to act together on the central axis, that is, by adding the bushing between the two bearings, the axial tensile load applied to the motor rotor by the propeller is distributed to the two bearings to share, thereby reducing the bearing load and effectively extending the bearing life. Under heavy-load motor and high-load conditions, the motor reliability can be effectively improved and the service life can be extended, while also meeting the demand for lightweight motors.

[0033] See also Figure 2 A bearing fixing channel is provided between the central shaft 100 and the central hole of the outer rotor stator seat 210, and the top bearing, the bottom bearing, and the sleeve are respectively provided in the bearing fixing channel. It should be noted that the bearing fixing channel is used to accommodate the top bearing, the bottom bearing, and the sleeve on the one hand, and to ensure the relative rotation of the bearings on the other hand to avoid radial deviation.

[0034] Furthermore, the bottom bearing is arranged at the bottom of the bearing fixing channel, the sleeve is accommodated in the bearing fixing channel, and one end of the sleeve is used to support the outer wall of the bottom bearing away from the bottom of the bearing fixing channel, and the top bearing is pressed on the end of the sleeve away from the abutment against the bottom bearing. It should be noted that the bottom bearing is firmly arranged at the bottom of the bearing fixing channel, bearing the vertical pressure of the central axis, and effectively reducing friction and wear, ensuring smooth rotation and precision. The sleeve is accommodated in the bearing fixing channel, and its design not only effectively utilizes the sufficient clearance of the channel, but also functionally realizes further support and protection of the bottom bearing. One end of the sleeve is supported on the outer wall of the bottom bearing away from the bottom of the bearing fixing channel, and the sleeve is tightly sleeved on the central axis, which not only enhances the stability of the structure, but also effectively disperses the force and prolongs the service life.

[0035] The top bearing continuously presses the sleeve, tightly pressing the sleeve on the end away from the bottom bearing, forming a stable support structure. This not only ensures the stability of the central shaft during rotation, but also further improves the operating efficiency and durability of the entire system through reasonable force and pressure distribution.

[0036] See also Figure 3 The bearing assembly further comprises a bearing locking mechanism 340, a mounting hole is provided on the bearing locking mechanism, the central shaft is passed through the mounting hole, a first bearing clamping area is provided between the bearing locking mechanism and the sleeve, and the bearing locking mechanism and the sleeve clamp the top bearing in the first bearing clamping area to prevent the top bearing from axially moving. Further, the bearing locking mechanism is closely attached to an end face of the top bearing away from the sleeve, and the bearing locking mechanism is used to lock the top bearing on the central shaft to prevent the top bearing from axially moving. It should be noted that the bearing locking mechanism is used to lock the top bearing, that is, to lock the top bearing on the sleeve. A first bearing clamping area is formed between the bearing locking mechanism and the sleeve. The top bearing is placed in this area, and under the joint action of the bearing locking mechanism and the sleeve, the top bearing is tightly clamped therein, effectively preventing the axial movement that may occur during the working process, thereby greatly improving the stability and durability of the system.

[0037] It should be noted that the bearing locking mechanism is connected to the external rotating stator seat by a thread. In the present embodiment, an internal thread is provided on the inner side wall of the center hole of the external rotating stator seat, and an external thread is provided on the bearing locking mechanism, and the external thread of the bearing locking mechanism is threadedly connected with the internal thread of the external rotating stator seat. In this way, by providing internal and external threads, not only the installation process is simplified and the work efficiency is improved, but also it is ensured that the bearing locking mechanism can fit tightly with the external rotating stator seat, further enhancing the stability and reliability of the entire assembly. In this way, the present invention provides a bearing locking mechanism, and by limiting the outer ring of the bearing, it can ensure that the inner and outer rings of the bearing do not undergo axial displacement, reduce the wear of the bearing raceway and the ball, effectively extend the bearing life, and solve the sliding failure of the outer ring of the bearing.

[0038] See also Figure 1 The bearing system further comprises a rotor assembly 400 and a rear end cover 500. The rotor assembly is rotatably arranged on the central axis, and the rear end cover is mounted on the rotor assembly. It should be noted that the rotor assembly 400 is used to cooperate with the stator assembly, and the rear end cover can be fixed; the rear end cover 500 is used to be assembled on the entire rotor assembly and the stator assembly to form a whole and improve stability.

[0039] See also Figure 3 The bearing assembly further comprises a large rear cover bearing 350, a bearing fixing hole is provided on the rear end cover, the large rear cover bearing is arranged in the bearing fixing hole, and the large rear cover bearing sleeve is arranged outside the outer rotor stator seat. The present invention uses a reinforced design of a large rear cover bearing to form a closed rotor structure, which enhances the load resistance of the motor rotor in both the axial and radial directions compared to a conventional open rotor structure, and effectively improves the reliability and service life of the motor.

[0040] See also Figure 4 , the bearing assembly also includes a bearing locking washer 360, which is fixed on the central axis, and the bearing locking washer is used to lock the bottom bearing on the central axis. It should be noted that the bearing locking washer 360 can further lock the bottom bearing on the central axis to support the bottom bearing. By locking the bearing locking washer, it is ensured that the bottom bearing can be firmly positioned on the central axis, thereby effectively preventing any unexpected displacement during operation. This not only enhances the overall stability of the bearing assembly, but also significantly improves its load-bearing capacity and durability. The role of the bearing locking washer 360 is not limited to a simple locking function, it can also provide a solid supporting surface for the bottom bearing, further ensuring the stability and reliability of the bearing when rotating at high speed or bearing heavy loads.

[0041] Furthermore, a second bearing clamping area is provided between the bearing locking washer and the shaft sleeve, and the bearing locking washer and the shaft sleeve clamp the bottom bearing in the second bearing clamping area. In order to further consolidate the fixing effect of the bottom bearing, a second bearing clamping area is also provided between the bearing locking washer 360 and the shaft sleeve. This makes full use of the gap between the bearing locking washer and the shaft sleeve, and through the close fit between the two, an effective clamping environment for the bottom bearing is formed. In the second bearing clamping area, the bottom bearing is firmly clamped, which not only ensures the stability of its axial position, but also reduces the wear caused by vibration or impact to a certain extent, thereby extending the service life of the bearing.

[0042] It can be understood that when the motor is subjected to an axial load, the blade 600 transfers the lift to the rotor assembly, and then transfers it to the bearing locking gasket through the rotor's stepped shaft, and then transfers the load to the bottom bearing, and then transfers the load to the top bearing through the connection between the inner ring of the bottom bearing and the sleeve, so that the top bearing and the bottom bearing share the axial load of the motor. Compared with ordinary motor bearing systems, the load-bearing capacity of the motor is greatly increased, while reducing the risk of the motor pulling off and collapsing.

[0043] Furthermore, when the top bearing is subjected to axial load, the bearing locking mechanism will not come out of the stator seat, ensuring the integrity of the bearing system. When the motor is under heavy load, the UAV motor needs greater pulling force, which requires larger blades to provide greater pulling force. When the blade radius is too large, it will bring greater radial deflection force. At this time, the large bearing of the rear cover will balance the radial deflection force, increase the stability of the rotor, and ensure the stability of the motor under heavy load conditions.

[0044] It should also be noted that the top bearing, bottom bearing, large bearing on the rear cover, bearing locking gasket, bushing, and bearing locking mechanism in the motor together constitute the bearing system structure of the heavy-load motor. This bearing system solves the problem of easy wear and tear of the bearings when the motor is overloaded, thereby improving the reliability of the motor and greatly increasing its service life. At the same time, it reduces the size requirements for the bottom bearing and reduces the motor's own weight.

[0045] The above-mentioned embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A bearing system for a heavy-duty motor used in a drone, characterized in that: include: Central axis, A stator assembly, the stator assembly comprising an outer rotating stator seat, the central axis passing through a central hole of the outer rotating stator seat; and A bearing assembly, the bearing assembly includes a top bearing, a bottom bearing and a sleeve, the top bearing and the bottom bearing are respectively sleeved on the central shaft, and the outer side wall of the top bearing and the outer side wall of the bottom bearing are tightly attached to the inner side wall of the central hole of the outer rotor stator seat, the sleeve is sleeved on the central shaft, and the two ends of the sleeve are respectively connected to the top bearing and the bottom bearing.

2. The bearing system for a heavy-duty motor for a UAV according to claim 1 is characterized in that: A bearing fixing channel is arranged between the central shaft and the central hole of the outer rotor stator seat, and the top bearing, the bottom bearing and the shaft sleeve are arranged in the bearing fixing channel respectively.

3. The bearing system for a heavy-duty motor for a UAV according to claim 2 is characterized in that: The bottom bearing is arranged at the bottom of the bearing fixing channel, the sleeve is accommodated in the bearing fixing channel, and one end of the sleeve is used to support the outer wall of the bottom bearing away from the bottom of the bearing fixing channel, and the top bearing is pressed on the end of the sleeve away from the abutment against the bottom bearing.

4. The bearing system for a heavy-duty motor for a UAV according to claim 1 is characterized in that: The bearing assembly also includes a bearing locking mechanism, a mounting hole is opened on the bearing locking mechanism, the center axis is passed through the mounting hole, a first bearing clamping area is arranged between the bearing locking mechanism and the sleeve, and the bearing locking mechanism and the sleeve clamp the top bearing in the first bearing clamping area to prevent the top bearing from axial movement.

5. The bearing system for a heavy-duty motor for a UAV according to claim 4 is characterized in that: The bearing locking mechanism is connected to the outer rotor stator seat via threads.

6. The bearing system for a heavy-duty motor for a UAV according to claim 5 is characterized in that: An internal thread is arranged on the inner side wall of the central hole of the external rotating stator seat, and an external thread is arranged on the bearing locking mechanism. The external thread of the bearing locking mechanism and the internal thread of the external rotating stator seat are threadedly connected with each other.

7. The bearing system for a heavy-duty motor for a UAV according to claim 1 is characterized in that: The bearing system further comprises a rotor assembly and a rear end cover. The rotor assembly is rotatably arranged on the central shaft, and the rear end cover is mounted on the rotor assembly.

8. The bearing system for a heavy-duty motor for a UAV according to claim 7 is characterized in that: The bearing assembly also includes a large rear cover bearing. A bearing fixing hole is opened on the rear end cover. The large rear cover bearing is arranged in the bearing fixing hole, and the large rear cover bearing sleeve is placed outside the outer rotor stator seat.

9. The bearing system for a heavy-duty motor for a UAV according to claim 1, characterized in that: The bearing assembly also includes a bearing locking washer, which is fixed on the central shaft and is used to lock the bottom bearing on the central shaft.

10. The bearing system for a heavy-load motor for a UAV according to claim 9, characterized in that: A second bearing clamping area is provided between the bearing locking washer and the shaft sleeve, and the bearing locking washer and the shaft sleeve clamp the bottom bearing in the second bearing clamping area.

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