Brushless motor with noise reduction function
By setting an annular cavity on the outside of the brushless motor bearing automatically replenishing grease and installing sound-absorbing cotton and sound-insulating boards inside the motor, the noise problem caused by drying the bearing grease is solved, and the noise reduction effect of the motor is achieved.
Patent Information
- Application Number
- CN202422924509.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-11-29
AI Technical Summary
The long-running brushless motors cause increased friction between the ball and the raceway due to drying of grease inside the bearing, causing noise problems, and the motor noise directly propagates to the external environment.
Multiple annular cavity are arranged on the outside of the bearing, automatic grease replenishment is achieved through bolts and piston structures, and sound-absorbing cotton and sound-insulating plates are arranged inside the motor to reduce noise.
Effectively lubricate the bearings, reduce friction noise, and reduce the overall noise level of the motor through sound-absorbing cotton and sound-insulating panels.
Smart Images
Figure CN223168136U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of motor equipment, and specifically relates to a brushless motor with a noise reduction function. Background Art
[0002] A brushless motor, also known as a brushless DC motor, is a motor that uses electronic circuits to replace traditional brushes and commutators to achieve motor current commutation.
[0003] For some motors that have been running for a long time, the grease inside the bearings dries up and wears out over time, resulting in increased friction between the balls and the raceways, exacerbating the noise problem. Secondly, brushless motors generate certain mechanical and electromagnetic noise during operation. If the lower shell of the brushless motor does not have a sound insulation board to block these sounds, the noise will be directly transmitted to the external environment. Based on the above problems, this application document proposes a brushless motor with noise reduction function to improve the above problems. Utility Model Content
[0004] The purpose of this utility model is to provide a brushless motor with noise reduction function, which can lubricate the inside of the bearing of the brushless motor, reduce the noise between the ball and the raceway, and at the same time set sound-absorbing cotton and sound insulation board inside the lower body shell to reduce the overall noise level of the motor.
[0005] The technical solutions adopted in this application are as follows:
[0006] A brushless motor with a noise reduction function comprises a stator and a rotor, wherein a lower body shell is fixed to the outside of the stator, an upper body shell is fixed to the upper end of the lower body shell, a bearing is provided inside the upper body shell, and the stator and rotor are rotatably connected through the bearing, and is characterized in that: a plurality of first cavities are opened on the outside of the bearing, and the plurality of first cavities are arranged in a ring shape, a first bolt is threadedly connected to the upper end of one of the first cavities, a connecting rod is fixed to the lower end of the first bolt, a piston is fixed to the lower end of the connecting rod, a support rod is fixed to the bottom end inside the first cavity, a first spring is fixed to the upper end of the support rod, and a partition is fixed to the upper end of the first spring.
[0007] In a preferred embodiment, a plurality of O-rings are provided on the outer side of the piston, and the plurality of O-rings are arranged at equal distances.
[0008] In a preferred embodiment, the diameter of the piston is smaller than the diameter of the first bolt, and the diameter of the partition is smaller than the diameter of the bottom of the first cavity.
[0009] In a preferred embodiment, the cross-section of the partition is an I-shape.
[0010] In a preferred embodiment, a plurality of second cavities are provided inside the upper end of the lower body shell, and sound-absorbing cotton is provided inside the plurality of second cavities.
[0011] In a preferred embodiment, a plurality of sound insulation plates arranged in a ring are provided at the lower end of the lower body shell. Third cavities are formed inside the lower body shell and at both ends of the sound insulation plates. A second spring is arranged inside the third cavity, and the second spring is located above the sound insulation plate. Second bolts are provided at both ends of the sound insulation plate at the lower end of the lower body shell, and the two second bolts are threadedly connected to the lower body shell.
[0012] In a preferred embodiment, a plurality of limiting rods are fixed to the bottom end of the lower body shell, and the plurality of limiting rods penetrate through the sound insulation plate and extend into the lower body shell.
[0013] The technical effects achieved by this utility model are as follows:
[0014] When the grease inside the bearing of the brushless motor dries up and is consumed, resulting in an increase in friction between the balls and the raceway and generating noise problems, by adding grease into the first cavity, the grease enters the first cavity. By rotating the first bolt, the first bolt moves downward to push the connecting rod and the piston downward. The piston moves downward to push the partition plate downward. The lower end of the partition plate compresses the first spring. At this time, the first cavity at the lower end of the piston is penetrated, and the grease enters the bearing for lubrication, thereby reducing the noise generated by the dryness of the bearing grease. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is the overall structure diagram of this utility model;
[0016] Figure 2 is the sectional view of the bearing of this utility model;
[0017] Figure 3 is this utility model Figure 2 partial enlarged schematic view at A in;
[0018] Figure 4 is the structure diagram of the piston and the partition plate of this utility model;
[0019] Figure 5 is the internal structure diagram of the lower body shell of this utility model;
[0020] Figure 6 is the top view of the lower body shell of this utility model;
[0021] Figure 7 is the sectional view of the lower body shell of this utility model;
[0022] Figure 8 is the structure diagram of the lower body and the sound insulation plate of this utility model.
[0023] In the drawings, the list of components represented by each reference numeral is as follows:
[0024] 10. Stator; 11. Rotor; 12. Lower body shell; 13. Upper body shell; 14. Bearing; 15. First cavity; 16. First bolt; 17. Connecting rod; 18. Piston; 19. Support rod; 20. First spring; 21. Partition; 22. O-ring; 23. Second cavity; 24. Sound insulation board; 25. Third cavity; 26. Second spring; 27. Second bolt; 28. Limit rod. DETAILED DESCRIPTION
[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.
[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0027] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" appearing in various places in this specification does not necessarily refer to the same embodiment, nor does it constitute a separate or selective embodiment that is mutually exclusive with other embodiments.
[0028] Furthermore, this utility is described in detail with reference to schematic diagrams. For ease of explanation, the cross-sectional views of the device structures will be partially enlarged and not to scale when describing the embodiments of this utility. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of this utility. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.
[0029] Please see the attached Figures 1 to 4 As shown, the present invention provides a brushless motor with a noise reduction function, including a stator 10 and a rotor 11, a lower body shell 12 is fixed to the outside of the stator 10, an upper body shell 13 is fixed to the upper end of the lower body shell 12, a bearing 14 is provided inside the upper body shell 13, and the stator 10 and the rotor 11 are rotatably connected through the bearing 14, a plurality of first cavities 15 are opened on the outside of the bearing 14, and the plurality of first cavities 15 are arranged in a ring shape, a first bolt 16 is threadedly connected to the upper end of a first cavity 15, a connecting rod 17 is fixed to the lower end of the first bolt 16, a piston 18 is fixed to the lower end of the connecting rod 17, a support rod 19 is fixed to the bottom end of the first cavity 15, a first spring 20 is fixed to the upper end of the support rod 19, and a partition 21 is fixed to the upper end of the first spring 20.
[0030] In this embodiment, when the grease inside the bearing 14 of the brushless motor dries up or is consumed, resulting in an increase in friction between the balls and the raceways and causing noise problems, the first bolt 16 and the piston 18 are removed, grease is added into the first cavity 15, the first bolt 16 and the piston 18 are installed. When the first bolt 16 is rotated, the piston 18 will move downward, and the piston 18 will push the grease downward. When the piston 18 continues to move downward, it will push the partition 21 downward. At this time, the grease reaches the inside of the bearing 14 through the lower end of the partition 21, thereby reducing noise. When the first bolt 16 is rotated in the reverse direction, the piston 18 continues to rise, and the first spring 20 pushes the partition 21 upward under the action of elastic force. When the first bolt 16 is no longer rotated, the lower end of the partition 21 isolates the upper and lower ends of the first cavity 15.
[0031] Secondly, please refer to again Figure 3 and Figure 4 , a plurality of O-rings 22 are arranged on the outer side of the piston 18, and the plurality of O-rings 22 are arranged at equal intervals.
[0032] In this embodiment, the O-rings 22 can be used to provide multiple sealing layers to isolate impurities such as dust. At the same time, the equal interval arrangement of the plurality of O-rings 22 helps to evenly disperse the pressure acting on the sealing surface and prevent a single O-ring 22 from being damaged due to excessive pressure.
[0033] Thirdly, please refer to together Figure 2 and Figure 3 , the diameter of the piston 18 is smaller than the diameter of the first bolt 16, and the diameter of the partition 21 is smaller than the diameter of the bottom of the first cavity 15.
[0034] In this embodiment, when the first bolt 16 is removed or installed, the diameter of the piston 18 is smaller than the diameter of the first bolt 16, which is convenient for installation. (It should be noted that the piston 18 is adapted to the first cavity 15). The diameter of the partition 21 is smaller than the diameter of the bottom of the first cavity 15, which is convenient for the partition 21 to move upward or downward. In the initial state, the first spring 20 pushes the partition 21 to isolate the upper and lower ends of the first cavity 15.
[0035] For further understanding and illustration, taking Figure 4 as an example, the cross-sectional shape of the partition 21 is an I-shape.
[0036] In this embodiment, the I-shaped cross-sectional shape of the partition 21 is convenient for the grease to enter the inside of the bearing 14 from the middle of the partition 21 when adding grease. After lubrication, the bottom end of the partition 21 can isolate the upper and lower ends of the first cavity 15.
[0037] In a preferred embodiment, please refer to Figure 5, a plurality of second cavities 23 are provided inside the upper end of the lower body case 12, and sound-absorbing cotton is provided inside the plurality of second cavities 23.
[0038] In this embodiment, during the operation of the brushless motor, mechanical noises will be generated by the rotation of the bearing 14, the relative movement between the rotor 11 and the stator 10, etc. When these noises propagate to the second cavity 23 inside the upper end of the lower body case 12, the sound-absorbing cotton can effectively absorb them.
[0039] Secondly, please refer to Figures 6 to 8 again. A plurality of sound insulation boards 24 arranged in a ring are provided at the lower end of the lower body case 12. Third cavities 25 are provided inside the lower body case 12 and at both ends of the sound insulation boards 24. A second spring 26 is provided inside the third cavities 25, and the second spring 26 is located above the sound insulation boards 24. Second bolts 27 are provided at both ends of the lower body case 12 and located at both ends of the sound insulation boards 24, and the two second bolts 27 are threadedly connected to the lower body case 12.
[0040] In this embodiment, when noise reduction is required, by rotating the two second bolts 27 at both ends of the sound insulation board 24, the two second bolts 27 will move upward when rotated. When the second bolts 27 move, they will push the sound insulation board 24 upward to compress the second spring 26. When the sound insulation board 24 rises to align with the inner wall of the lower body case 12, it will no longer move upward. At this time, the sound insulation board 24 can weaken the noise generated inside the brushless motor.
[0041] Thirdly, please refer to Figure 6 and Figure 8 together. A plurality of limiting rods 28 are fixed to the bottom end of the lower body case 12, and the plurality of limiting rods 28 penetrate through the sound insulation board 24 and extend into the lower body case 12.
[0042] In this embodiment, the limiting rods 28 can prevent the sound insulation board 24 from shifting when the sound insulation board 24 moves upward or downward.
[0043] The working principle of this utility model is as follows:
[0044] When a noise problem occurs in the bearing 14 of the brushless motor, grease is added to the first cavity 15 by removing the first bolt 16. Rotating the first bolt 16 can enter the bearing 14 for lubrication and noise reduction under the push of the piston 18, and the sound insulation board 24 can reduce the noise generated inside the brushless motor.
[0045] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model. The structures, devices, and operation methods not specifically described and explained in the present utility model are implemented according to the conventional means in the art without special description and limitation.
Claims
1. A brushless motor with a noise reduction function, comprising a stator (10) and a rotor (11). A lower body shell (12) is fixed to the outside of the stator (10). An upper body shell (13) is fixed to the upper end of the lower body shell (12). A bearing (14) is arranged inside the upper body shell (13). The stator (10) and the rotor (11) are rotatably connected through the bearing (14), and it is characterized in that: A plurality of first cavities (15) are provided on the outside of the bearing (14), and the plurality of first cavities (15) are arranged in a ring shape. A first bolt (16) is threadedly connected to the upper end of one of the first cavities (15), a connecting rod (17) is fixed to the lower end of the first bolt (16), a piston (18) is fixed to the lower end of the connecting rod (17), a support rod (19) is fixed to the bottom end of the first cavity (15), a first spring (20) is fixed to the upper end of the support rod (19), and a partition (21) is fixed to the upper end of the first spring (20).
2. A brushless motor with a noise reduction function according to claim 1, characterized in that: A plurality of O-rings (22) are arranged on the outer side of the piston (18), and the plurality of O-rings (22) are arranged at equal distances.
3. The brushless motor with a noise reduction function according to claim 1, characterized in that: The diameter of the piston (18) is smaller than the diameter of the first bolt (16), and the diameter of the partition (21) is smaller than the diameter of the bottom of the first cavity (15).
4. A brushless motor with a noise reduction function according to claim 1, characterized in that: The cross-sectional shape of the partition (21) is an I-shape.
5. The brushless motor with a noise reduction function according to claim 1, characterized in that: A plurality of second cavities (23) are provided inside the upper end of the lower body shell (12), and sound-absorbing cotton is provided inside the plurality of second cavities (23).
6. The brushless motor with a noise reduction function according to claim 1, characterized in that: The lower end of the lower body shell (12) is provided with a plurality of annularly arranged sound insulation plates (24), a third cavity (25) is provided inside the lower body shell (12) and at both ends of the sound insulation plates (24), a second spring (26) is provided inside the third cavity (25), and the second spring (26) is located at the upper end of the sound insulation plates (24), a second bolt (27) is provided at the lower end of the lower body shell (12) and at both ends of the sound insulation plates (24), and the two second bolts (27) are threadedly connected to the lower body shell (12).
7. A brushless motor with a noise reduction function according to claim 1, characterized in that: A plurality of limiting rods (28) are fixed to the bottom end of the lower body shell (12), and the plurality of limiting rods (28) pass through the sound insulation board (24) and extend to the interior of the lower body shell (12).