A bearing lubricated brushless motor structure

Abstract

The utility model belongs to brushless motor technical field, concretely is a kind of bearing lubricated brushless motor structure, including shell, the inside fixed connection of shell has installation cylinder, the inside fixed mounting of installation cylinder has stator coil, the outside of stator coil is provided with rotor body, the end fixed mounting of shell has end cover, the end cover, installation cylinder and shell are all rotatably installed with a group of rotating shafts between bearing assembly, without disassembling motor shell, end cover and other components, only through external oil injection pipe can complete lubricating oil supplement, simplify maintenance process;Reduce the overall maintenance or replacement of motor caused by bearing failure, reduce the time and economic cost of equipment maintenance.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, specifically to a brushless motor structure with bearing lubrication. Background Technology

[0002] Brushless motors are widely used in home appliances, industrial drive devices, smart wearables and small electronic devices due to their high efficiency, low noise and long life. Their core power transmission relies on the cooperation of the shaft and bearing assembly. As the power output carrier, the shaft needs to be supported by bearing assemblies at both ends to ensure the precise relative position of the rotor and stator coil, thereby ensuring the magnetic field drive efficiency and the stability of motor operation.

[0003] During the long-term operation of a brushless motor, the bearing assembly (composed of an inner ring, an outer ring, and balls) is a critical and vulnerable component. When there is insufficient grease inside the bearing, the metal contact surface between the balls and the roller grooves is directly exposed, and the frictional resistance increases sharply. This not only leads to increased motor noise and energy consumption, but also accelerates the wear of the balls and grooves. Under long-term lack of lubrication, the metal debris generated by wear will further aggravate frictional loss, eventually causing bearing jamming. In severe cases, it can lead to shaft seizure, causing the entire motor to fail, significantly shortening the service life of the brushless motor, and increasing equipment maintenance costs and failure risks. To facilitate the lubrication of the bearings in a brushless motor, we propose a bearing-lubricated brushless motor structure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a brushless motor structure with bearing lubrication, thus solving the problems mentioned below.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A brushless motor structure with bearing lubrication includes a housing, an installation cylinder fixedly connected inside the housing, a stator coil fixedly installed inside the installation cylinder, a rotor body disposed outside the stator coil, an end cap fixedly installed at the end of the housing, and a set of rotating shafts rotatably mounted between the end cap, the installation cylinder, and the housing via a bearing assembly. The bearing assembly includes an inner ring and an outer ring, with a plurality of balls disposed between the inner ring and the outer ring. An oil injection chamber is provided on the rotating shaft, and a plurality of oil supply holes communicating with the oil injection chamber are provided on the rotating shaft. A plurality of oil immersion holes are provided on the inner ring, and the oil supply holes are connected to the corresponding oil immersion holes.

[0006] Preferably, a first roller groove is formed at the center of the outer side of the inner ring, and a second roller groove is formed at the center of the inner side of the outer ring, with the ball disposed between the first roller groove and the second roller groove.

[0007] Preferably, the inner side of the outer ring is fixedly connected with two sets of sealing lips, and the outer side of the inner ring is provided with two sets of sealing grooves corresponding to the sealing lips, and the sealing lips abut against the corresponding sealing grooves.

[0008] Preferably, the end of the rotating shaft is rotatably connected to a rotary joint, and the end of the rotary joint away from the rotating shaft is fixedly connected to an oil injection pipe.

[0009] Preferably, a plurality of permanent magnets are mounted on the rotor body, and the rotating shaft is fixedly inserted through the rotor body.

[0010] Preferably, a Hall sensor is fixedly installed on the inner wall of the end cap, and a plurality of detectors are fixedly connected to the rotor body near the Hall sensor, with each detector corresponding to a permanent magnet on the rotor body.

[0011] This invention provides a brushless motor structure with bearing lubrication. Compared with the prior art, it has the following advantages: 1. Achieve continuous and efficient lubrication of bearings and avoid jamming failure: The oil injection chamber and oil supply hole inside the shaft are connected to the oil immersion hole of the inner ring. With the help of the rotary joint and oil injection pipe at the end of the shaft, lubricating oil can be injected into the bearing assembly at any time. The lubricating medium can be replenished without disassembling the motor, thus avoiding bearing jamming and shaft seizure failure.

[0012] 2. Sealing design to extend bearing life: The sealing lip on the inner side of the outer ring and the sealing groove on the outer side of the inner ring fit tightly together. On the one hand, it can firmly lock the lubricating oil inside the bearing assembly and prevent it from being lost due to centrifugal force or temperature changes during high-speed operation, ensuring that the oil film continuously covers the friction surface. On the other hand, it can prevent external dust and impurities from entering the bearing, avoid the generation of metal shavings, reduce the wear of the balls and roller grooves, and significantly extend the service life of the bearing assembly.

[0013] 3. High operational stability, low energy consumption and noise: The good lubrication and low friction characteristics of the bearing assembly can reduce the overall operating resistance of the motor, reduce energy loss, and suppress noise caused by friction, thus improving the user experience.

[0014] 4. Improved ease of maintenance and reduced maintenance costs: No need to disassemble the motor housing, end cover and other parts, lubrication can be replenished through the external oil filling pipe, simplifying the maintenance process; reducing the need for overall motor repair or replacement due to bearing failure, reducing the time and economic costs of equipment maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the main cross-sectional structure of the present invention; Figure 3This is a schematic diagram of the main body disassembled structure of this utility model; Figure 4 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the cross-sectional structure of the bearing assembly of this utility model.

[0016] In the diagram: 1. Outer shell; 2. End cap; 3. Shaft; 4. Bearing assembly; 5. Mounting cylinder; 6. Stator coil; 7. Rotor body; 8. Ball bearing; 9. Outer ring; 10. Sealing lip; 11. Inner ring; 12. Oil immersion hole; 13. Oil supply hole; 14. Oil injection chamber. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-5 This utility model provides a technical solution: a brushless motor structure with bearing lubrication, including a housing 1, an installation cylinder 5 fixedly connected inside the housing 1, a stator coil 6 fixedly installed inside the installation cylinder 5, a rotor body 7 provided outside the stator coil 6, an end cover 2 fixedly installed at the end of the housing 1, and a set of rotating shafts 3 rotatably installed between the end cover 2, the installation cylinder 5 and the housing 1 through a bearing assembly 4. The bearing assembly 4 includes an inner ring 11 and an outer ring 9. A plurality of balls 8 are arranged between the inner ring 11 and the outer ring 9. An oil injection cavity 14 is provided on the rotating shaft 3. A plurality of oil supply holes 13 communicating with the oil injection cavity 14 are provided on the rotating shaft 3. A plurality of oil immersion holes 12 are provided on the inner ring 11. The oil supply holes 13 are connected to the corresponding oil immersion holes 12.

[0019] The lubricating grease enters the ball bearing 8 on the bearing assembly 4 through the oil injection chamber 14, oil supply hole 13 and oil immersion hole 12 on the rotating shaft 3, thereby lubricating the ball bearing 8.

[0020] The inner ring 11 has a first roller groove in the middle of its outer side, and the outer ring 9 has a second roller groove in the middle of its inner side. The ball 8 is located between the first roller groove and the second roller groove.

[0021] Two sets of sealing lips 10 are fixedly connected to the inner side of the outer ring 9, and two sets of sealing grooves corresponding to the sealing lips 10 are opened on the outer side of the inner ring 11. The sealing lips 10 abut against the corresponding sealing grooves. On the one hand, it can prevent the lubricating oil inside the bearing assembly 4 from leaking outward, ensuring that the oil film continuously covers the friction surface; on the other hand, it can prevent external dust and impurities from entering the bearing, avoid the generation of metal shavings, and further extend the service life of the bearing assembly 4.

[0022] The end of the rotating shaft 3 is rotatably connected to a rotary joint, and the end of the rotary joint away from the rotating shaft 3 is fixedly connected to an oil injection pipe, which can be easily connected to the oil injection pipe.

[0023] Several permanent magnets are installed on the rotor body 7, and the rotating shaft 3 is fixedly installed on the rotor body 7.

[0024] A Hall sensor is fixedly installed on the inner wall of the end cover 2. Several detectors are fixedly connected to the rotor body 7 near the Hall sensor. Each detector corresponds to a permanent magnet on the rotor body 7. The real-time speed and position of the rotor body 7 are determined by the position change of the detector. The feedback signal is used to adjust the current commutation timing of the stator coil 6 to avoid rotor loss of synchronism and ensure that the rotating shaft 3 rotates continuously and stably.

[0025] Working principle: When the stator coil 6 inside the mounting cylinder 5 is energized, it generates a periodically changing rotating magnetic field. The magnetic force generated by this magnetic field and the permanent magnet on the rotor body 7 drives the rotor body 7 to rotate. The rotor body 7 is fixedly connected to the rotating shaft 3, thereby driving the rotating shaft 3 to rotate synchronously and realize power output. The Hall sensor on the inner wall of the end cover 2 detects the detection body on the rotor body 7 in real time. By judging the real-time speed and position of the rotor body 7 through the position change of the detection body, the feedback signal adjusts the current commutation timing of the stator coil 6 to avoid rotor loss of synchronization and ensure that the rotating shaft 3 rotates continuously and stably. Lubricating oil injection path: Lubricating oil is injected through the oil injection pipe at the end of the rotating shaft 3. The oil injection pipe is connected to the rotary joint. The lubricating oil enters the oil injection chamber 14 inside the rotating shaft 3 through the rotary joint. Then, the lubricating oil flows to the inner ring 11 of the bearing assembly 4 through the oil delivery hole 13 connected to the oil injection chamber 14. Then, through the oil immersion hole 12 on the inner ring 11, it is delivered to the ball 8 area between the inner ring 11 and the outer ring 9. Lubricating oil is filled between the ball 8 and the first roller groove of the inner ring 11 and the second roller groove of the outer ring 9 to form an oil film, which reduces the direct metal friction between the ball 8 and the roller groove when rotating, reduces wear and operating noise, and avoids the jamming problem caused by insufficient oil in traditional structures. The two sets of sealing lips 10 on the inner side of the outer ring 9 are in close contact with the sealing groove on the outer side of the inner ring 11 to form a double sealing structure: on the one hand, it can prevent the lubricating oil inside the bearing assembly 4 from leaking outward, ensuring that the oil film continuously covers the friction surface; on the other hand, it can prevent external dust and impurities from entering the bearing, avoid the generation of metal shavings, and further extend the service life of the bearing assembly 4.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A brushless motor structure with bearing lubrication, comprising a housing (1), characterized in that: An installation cylinder (5) is fixedly connected inside the outer shell (1). A stator coil (6) is fixedly installed inside the installation cylinder (5). A rotor body (7) is provided outside the stator coil (6). An end cover (2) is fixedly installed at the end of the outer shell (1). A set of rotating shafts (3) are rotatably installed between the end cover (2), the installation cylinder (5) and the outer shell (1) through a bearing assembly (4). The bearing assembly (4) includes an inner ring (11) and an outer ring (9). A plurality of balls (8) are provided between the inner ring (11) and the outer ring (9). An oil injection cavity (14) is provided on the rotating shaft (3). A plurality of oil supply holes (13) communicating with the oil injection cavity (14) are provided on the rotating shaft (3). A plurality of oil immersion holes (12) are provided on the inner ring (11). The oil supply holes (13) are connected to the corresponding oil immersion holes (12).

2. The brushless motor structure with bearing lubrication according to claim 1, characterized in that: The inner ring (11) has a first roller groove in the middle of its outer side, and the outer ring (9) has a second roller groove in the middle of its inner side. The ball (8) is located between the first roller groove and the second roller groove.

3. The brushless motor structure with bearing lubrication according to claim 2, characterized in that: The inner side of the outer ring (9) is fixedly connected with two sets of sealing lips (10), and the outer side of the inner ring (11) is provided with two sets of sealing grooves corresponding to the sealing lips (10), and the sealing lips (10) abut against the corresponding sealing grooves.

4. The brushless motor structure with bearing lubrication according to claim 3, characterized in that: The end of the rotating shaft (3) is rotatably connected to a rotary joint, and the end of the rotary joint away from the rotating shaft (3) is fixedly connected to an oil injection pipe.

5. The brushless motor structure with bearing lubrication according to claim 4, characterized in that: A number of permanent magnets are installed on the rotor body (7), and the rotating shaft (3) is fixedly inserted on the rotor body (7).

6. The brushless motor structure with bearing lubrication according to claim 5, characterized in that: A Hall sensor is fixedly installed on the inner wall of the end cap (2), and several detection bodies are fixedly connected to the rotor body (7) near the Hall sensor. The detection bodies correspond one-to-one with the permanent magnets on the rotor body (7).

Images