A self-lubricating, noise-reducing brushless motor

Abstract

This invention discloses a self-lubricating, noise-reducing brushless motor, comprising a motor housing and a motor shaft rotatably connected to the motor housing via a bearing. A cavity is formed inside the motor housing near the bearing, and an oil reservoir fixed to the motor housing is disposed within the cavity. One side of the oil reservoir is connected to an oil inlet via an oil supply pipe, and the other side is connected to an oil return pipe via an oil return pipe. This invention relates to the field of brushless motor technology. Through the rotational power of the motor itself, and the combination of a cam, the oil reservoir, and the oil supply and return pipes, continuous and forced oil supply to the bearing is achieved, ensuring reliable lubrication. Simultaneously, the heat exchange oil box and heat dissipation fin structure can quickly and efficiently conduct the heat generated by the bearing to the motor housing for dissipation, solving the problem of excessive bearing temperature rise and effectively preventing premature lubricant failure, thereby greatly extending the service life of the bearing and even the entire motor.

Description

Technical Field

[0001] This invention relates to the field of brushless motor technology, specifically to a self-lubricating, noise-reducing brushless motor. Background Technology

[0002] Brushless motors, with their high efficiency, long lifespan and excellent speed regulation performance, have been widely used in industrial automation, home appliances, aerospace and other fields.

[0003] Among these issues, bearing lubrication and heat dissipation are key problems. Traditional lubrication methods often use one-time filling of grease. However, during prolonged high-load operation of the motor, the grease's temperature rises sharply due to frictional heat, leading to a decrease in viscosity, oxidation, and even drying out. Lubrication failure drastically increases bearing wear, generates abnormal noise, shortens motor lifespan, and in severe cases, can even cause the motor to seize up and become unusable.

[0004] Although some high-end motors are designed with complex circulating oil circuit systems, these systems usually require external oil pumps and independent drive units, which not only increases the structural complexity, size and cost of the motor, but also introduces additional failure points and reduces the reliability of the system.

[0005] Meanwhile, noise pollution from high-speed motor operation is becoming increasingly prominent. Noise primarily originates from electromagnetic vibration, mechanical friction, and airflow disturbance, with mechanical vibration at the bearings being a significant source of high-frequency noise. Excessive noise not only affects the user experience but is also unacceptable in demanding environments such as those used in precision instruments and medical equipment. Existing noise reduction measures largely focus on optimizing electromagnetic design and using soundproof enclosures, but their direct and active suppression of the bearings—the core noise source—is limited. Therefore, designing an integrated solution that can achieve active and efficient lubrication and heat dissipation of the bearings while effectively suppressing operating noise, without significantly increasing the complexity of the motor structure or external dependence, is a key technical challenge that needs to be addressed in the field of brushless motor technology. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a self-lubricating, noise-reducing brushless motor, which solves the problem that existing bearings cannot perform active lubrication and heat dissipation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a self-lubricating noise-reducing brushless motor, comprising a motor housing and a motor shaft rotatably connected to the motor housing via bearings, wherein oil supply holes and oil return holes are respectively provided at opposite ends of the outer ring of the bearing; a cavity is formed inside the motor housing on the side close to the bearing, and an oil reservoir fixed to the motor housing is provided in the cavity; one side of the oil reservoir is connected to the oil supply hole via an oil supply pipeline, and the other side is connected to the oil return hole via an oil return pipeline; and an oil replenishment pipe penetrating the motor housing is provided on the oil reservoir.

[0008] The oil reservoir includes a cylinder body and a cylinder cover that is elastically connected to the cylinder body by a spring. An oil storage cavity is formed between the cylinder cover and the cylinder body. A first sleeve and a second sleeve are respectively provided at the part of the motor shaft located in the cavity and at the connection point with the motor housing. A pressure-applying component is provided on the outside of the first sleeve. The pressure-applying component fits against the cylinder cover and repeatedly compresses the cylinder cover to apply pressure to the oil storage cavity, so that the oil reservoir and the bearing form a circulating oil supply path through the oil supply pipeline and the oil return pipeline.

[0009] Preferably, the bottom of the cylinder cover is provided with a pull rod that is inserted into the oil storage chamber, and a piston that closes the oil storage chamber is fixed at the bottom of the pull rod.

[0010] Preferably, the oil supply pipeline includes a second connecting nozzle disposed on the cylinder body, and the second connecting nozzle is connected to the oil supply hole through the oil supply pipeline;

[0011] The oil supply pipe is equipped with a first check valve.

[0012] Preferably, the oil return pipeline includes a first connecting nozzle disposed on the cylinder body, the first connecting nozzle being connected to one end of a heat exchange oil box via a second oil return pipe, and the other end of the heat exchange oil box being connected to an oil return hole via the first oil return pipe;

[0013] A second check valve is installed on the second return oil pipe.

[0014] Preferably, the heat exchange oil box includes a bottom box and a box cover that can be interlocked, and a heat exchange chamber is formed between the box cover and the bottom box.

[0015] Preferably, the bottom of the base box is a wavy base plate formed by continuously arranged protrusions and recesses, and an opening is provided in the recesses;

[0016] The bottom of the heat exchange oil box is provided with a base plate that is fixed to the motor housing. The top of the base plate is provided with several heat dissipation fins. The heat dissipation fins are inserted into the opening and are circumferentially sealed to the opening.

[0017] Preferably, the bottom surface of the base plate is coated with thermal grease.

[0018] Preferably, the cylinder body is also provided with a third connecting nozzle for connecting to the oil replenishment pipe.

[0019] Preferably, the first sleeve has a stepped portion for connecting a pressure-applying element, which is a cam.

[0020] Preferably, a clamping cavity with an opening on one side is formed between the inner sides of the first sleeve and the bearing. The first sleeve and the second sleeve are each provided with an inner cylinder inside the clamping cavity. The inner wall of the inner cylinder is provided with a plurality of partitions, and a cavity is formed between two adjacent partitions. Each cavity is provided with sound-absorbing cotton.

[0021] The beneficial effects of this invention are:

[0022] 1. By using the self-lubricating noise-reducing brushless motor provided by this invention, the motor's own rotational power, combined with the cam and oil reservoir, oil supply line and oil return line, achieves continuous and forced oil supply to the bearing, ensuring reliable lubrication. At the same time, through the heat exchange oil box and heat dissipation fin structure, the heat generated by the bearing can be quickly and efficiently conducted to the motor housing for dissipation, solving the problem of excessive bearing temperature rise, effectively preventing premature lubricant failure, and thus greatly extending the service life of the bearing and even the entire motor.

[0023] 2. By capturing noise through a cavity set between the motor shaft and the housing, and by using multiple independent cavities filled with sound-absorbing cotton to absorb and attenuate sound waves, the high-speed operating noise from the bearings and motor shaft can be effectively suppressed. This direct noise reduction method targeting the main noise source is highly effective, providing users with a quieter and more comfortable operating environment, and broadening the applicability of the motor in application scenarios where quiet operation is required. Attached Figure Description

[0024] Figure 1 This is the front view of the present invention;

[0025] Figure 2 This is an isometric view of the heat exchange oil box of the present invention;

[0026] Figure 3 This is a top view of the bottom box of the present invention;

[0027] Figure 4 For the present invention Figure 3 Sectional view along line AA;

[0028] Figure 5 This is a front view of the oil storage tank of the present invention;

[0029] Figure 6 This is a schematic diagram of the first and second sleeve structures of the present invention;

[0030] Figure 7 For the present invention Figure 6Enlarged structural diagram at point A in the middle;

[0031] Figure 8 This is an isometric view of the brushless motor of the present invention.

[0032] Explanation of reference numerals in the figure: 1. Motor housing; 2. Motor shaft; 3. Bearing; 4. Cavity; 5. Oil inlet hole; 6. Oil return hole; 7. First sleeve; 71. Stepped section; 8. Second sleeve; 9. Clamping cavity; 10. Pressure applying component; 11. Oil reservoir; 111. Cylinder cover; 112. Cylinder body; 113. Spring; 114. Pull rod; 115. Piston; 116. Oil reservoir; 117. First connecting nozzle; 118. Second connecting nozzle; 119. Third connecting nozzle; 12. Oil supply pipe; 13. First oil return pipe; 14. Oil replenishment pipe; 15. Second oil return pipe; 16. Heat exchange oil box; 161. Base box; 162. Box cover; 163. Heat exchange chamber; 164. Protrusion; 165. Recess; 166. Opening; 167. Base plate; 168. Thermal grease; 169. Heat dissipation fins; 17. Inner cylinder; 18. Partition plate; 19. Chamber; 20. Sound-absorbing cotton. Detailed Implementation

[0033] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] This invention discloses a self-lubricating noise-reducing brushless motor, comprising an oil reservoir disposed in the internal cavity of the motor and fixed to the motor housing. One side of the oil reservoir is connected to an oil inlet via an oil supply pipe, and the other side is connected to an oil return via an oil return pipe. A first sleeve and a second sleeve are respectively disposed at the part of the motor shaft located in the cavity and at the connection point with the motor housing. Both the first sleeve and the second sleeve are provided with an inner cylinder located inside the clamping cavity. Several partitions are provided on the inner wall of the inner cylinder, and a cavity is formed between two adjacent partitions. Sound-absorbing cotton is provided in each cavity. This brushless motor can continuously and forcefully supply oil to the bearings through its own rotational power, ensuring reliable lubrication. At the same time, through the heat exchange oil box and heat dissipation fin structure, the heat generated by the bearings can be quickly and efficiently conducted to the motor housing for dissipation, solving the problem of excessive bearing temperature rise and effectively preventing premature lubricant failure, thereby greatly extending the service life of the bearings and even the entire motor. In addition, multiple independent cavities filled with sound-absorbing cotton in the two sleeves absorb and attenuate sound waves, effectively suppressing high-speed operating noise from the bearings and motor shaft.

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments; various changes can be made to the implementation scheme as long as the effects of the present invention can be achieved.

[0036] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0037] like Figures 1 to 8 As shown in the figure, this embodiment discloses a self-lubricating noise-reducing brushless motor, including a motor housing 1 and a motor shaft 2 rotatably connected to the motor housing 1 via a bearing 3.

[0038] Specifically, such as Figure 1 As shown, in this embodiment, the outer ring of the bearing 3 is provided with an oil supply hole 5 and an oil return hole 6 at opposite ends. The oil supply hole 5 and the oil return hole 6 are symmetrically distributed at 180 degrees on the circumference of the outer ring of the bearing. They are used to supply lubricating oil to the bearing 3 and to discharge the melted lubricating oil, thereby reducing the temperature at the bearing 3 in real time. In order to achieve real-time oil supply to the bearing 3 and recovery of the melted lubricating oil, a cavity 4 is formed inside the motor housing 1 on the side close to the bearing 3. The cavity 4 is an independent and sealed space formed by the extension of the motor housing 1 to one side. Since the motor housing 1 extends, the motor shaft 2 in this embodiment is also a long shaft. An oil storage cylinder 11 fixed to the motor housing 1 is provided in the cavity 4. An oil replenishment pipe 14 is provided on the oil storage cylinder 11, which penetrates the motor housing 1, so as to facilitate external oil replenishment without disassembling the motor. A third connecting nozzle 119 for connecting the oil replenishment pipe 14 is also provided on the cylinder body 112.

[0039] Furthermore, one side of the oil reservoir 11 is connected to the oil supply hole 5 via an oil supply pipeline, which is used to supply the lubricating oil in the oil reservoir 11 into the oil supply hole 5 of the bearing 3; the other side of the oil reservoir 11 is connected to the oil return hole 6 via a return oil pipeline, which is used to cool the melted lubricating oil in the bearing 3 in the return oil pipeline and then recover it into the oil reservoir 11.

[0040] Specifically, in this embodiment, as Figure 5 As shown, the oil reservoir 11 includes a cylinder body 112 and a cylinder cover 111 elastically connected to the cylinder body 112 by a spring 113. The cylinder cover 111 can reciprocate along the axial direction of the cylinder body 112, and an oil storage cavity 116 is formed between the cylinder cover 111 and the cylinder body 112. The oil supply pipeline and the oil return pipeline are connected in the oil storage cavity 116.

[0041] Furthermore, a first sleeve 7 and a second sleeve 8 are respectively provided at the portion of the motor shaft 2 located in the cavity 4 and at the connection point with the motor housing 1. The first sleeve 7 and the second sleeve 8 are used to absorb the noise generated by the motor shaft 2 during high-speed operation, thus reducing noise. In addition, a pressure-applying member 10 is provided on the outside of the first sleeve 7, and a stepped portion 71 for connecting the pressure-applying member 10 is formed on the first sleeve 7. The pressure-applying member 10 is a cam. The pressure-applying member 10 fits against the cylinder cover 111. When the motor shaft 2 rotates at high speed, it drives the cam to rotate and repeatedly compresses the cylinder cover 111, providing oil to the oil storage chamber 1. 16. Internal pressure is applied to the oil reservoir 11 and the bearing 3 to form a circulating oil supply path through the oil supply line and the oil return line. Specifically, when the cam protrusion contacts the cylinder cover 111, the cylinder cover 111 is attached to the cylinder body 112, the space inside the oil reservoir 116 becomes smaller and pressure is generated, and the cooled lubricating oil is supplied to the oil supply hole 5 of the bearing 3 through the oil supply line. When the cam protrusion moves away from the cylinder cover 111, the cylinder cover 111 and the cylinder cover spring 113 return to their original position, and the space inside the oil reservoir 116 is restored to generate negative pressure, so that the lubricating oil melted in the bearing 3 is cooled in the oil return line and recycled back to the oil reservoir 11.

[0042] To enhance the effect of applying pressure and generating negative pressure in the oil storage chamber 116, in this embodiment, a pull rod 114 is provided at the bottom of the cylinder cover 111 and inserted into the oil storage chamber 116. A piston 115 that seals the oil storage chamber 116 is fixed at the bottom of the pull rod 114. The outer peripheral wall of the piston 115 is tightly fitted with the inner wall of the oil storage chamber 116 to form a dynamic seal. When the cylinder cover 111 moves back and forth, the piston 115 is driven to move back and forth through the pull rod 114, so that a pull-out cavity is formed inside the oil storage chamber 116.

[0043] In one implementation, such as Figure 1 As shown, the oil supply line includes a second connecting nozzle 118 installed on the cylinder body 112. The second connecting nozzle 118 is connected to the oil supply hole 5 through the oil supply pipe 12. A first check valve is installed on the oil supply pipe 12. By installing the first check valve, the lubricating oil in the oil storage chamber 116 can only flow out through the oil supply pipe 12 when it flows out.

[0044] In one implementation, such as Figure 1 As shown, the return oil pipeline includes a first connecting nozzle 117 installed on the cylinder body 112. The first connecting nozzle 117 is connected to one end of the heat exchange oil box 16 through the second return oil pipe 15. The other end of the heat exchange oil box 16 is connected to the return oil hole 6 through the first return oil pipe 13. A second one-way valve is installed on the second return oil pipe 15. By installing the second one-way valve, the lubricating oil in the oil storage chamber 116 will not enter the second return oil pipe 15, ensuring that the lubricating oil cooled by the heat exchange oil box 16 can be drawn from the second return oil pipe 15 when the oil storage chamber 116 is under negative pressure.

[0045] In this embodiment, as Figure 2 As shown, the heat exchange oil box 16 includes a bottom box 161 and a box cover 162 that can be interlocked. The two are fastened together by bolts. A heat exchange chamber 163 is formed between the box cover 162 and the bottom box 161. The first return oil pipe 13 and the second return oil pipe 15 are both connected to the box cover 162 and communicate with the heat exchange chamber 163.

[0046] Furthermore, in this embodiment, the bottom of the bottom box 161 is a wavy bottom plate formed by continuously arranged protrusions 164 and recesses 165. This wavy structure increases the contact area between the lubricating oil and the bottom box, allowing the lubricating oil that has melted and returned through the first return oil pipe 13 to have a longer flow time on the wavy bottom plate, thereby slowing down the flow speed and improving the heat exchange effect. In addition, an opening 166 is provided at the recess 165.

[0047] Furthermore, such as Figure 4 As shown, the bottom of the heat exchange oil box 16 is provided with a base plate 167 fixed to the motor housing 1. The base plate 167 is rigidly connected to the motor housing 1 by several countersunk screws. The bottom surface of the base plate 167 is coated with heat-dissipating silicone grease 168. The heat-dissipating silicone grease 168 can effectively fill the microscopic gap between the base plate 167 and the motor housing 1, greatly reducing the contact thermal resistance. The top of the base plate 167 is provided with several heat dissipation fins 169. The heat dissipation fins 169 are inserted into the opening 166, and the heat dissipation fins 169 are circumferentially sealed and welded to the opening 166. In practice, the flowing lubricating grease comes into contact with the heat dissipation fins 169 for heat exchange. The heat dissipation fins 169 transfer the heat to the base plate 167, and finally dissipate it through the motor housing 1, realizing the heat exchange of the returning lubricating grease. In this embodiment, the base plate 167 and the heat dissipation fins 169 are made of aluminum alloy, which has good thermal conductivity and lightweight characteristics.

[0048] like Figure 1 , Figure 6 and Figure 7 As shown, a cavity 9 with an opening on one side is formed between the inner side of the first sleeve 7 and the second sleeve 8 and the bearing 3. The openings of the cavity 9 face the same direction, forming a semi-closed cavity. Both the first sleeve 7 and the second sleeve 8 are provided with an inner cylinder 17 inside the cavity 9. Several partitions 18 are provided on the inner wall of the inner cylinder. A cavity 19 is formed between two adjacent partitions 18. Each cavity 19 is provided with sound-absorbing cotton 20. The sound-absorbing cotton 20 is a high-density polyurethane foam material, which has excellent absorption effect on mid-to-high frequency noise.

[0049] The noise generated when the motor shaft 2 is running at high speed enters the clamping cavity 9. At this time, the noise is absorbed by the sound-absorbing cotton 20 in the multiple partitions 19, which reduces the noise generated by the motor during operation.

[0050] A detailed working principle of this embodiment is as follows: When the cam protrusion rotates to contact the cylinder cover 111 of the oil reservoir 11, it pushes the cylinder cover 111 to move towards the cylinder body 112 and compresses the spring 113; the cylinder cover 111 drives the piston 115 to move down through the pull rod 114, causing the volume in the oil reservoir 116 to decrease rapidly and the internal pressure to increase sharply; under high pressure, the cooling lubricating oil in the oil reservoir 116 is squeezed out and forced into the bearing through the oil supply pipe 12 from the oil supply hole 5 of the outer ring of the bearing 3 to lubricate the bearing 3;

[0051] When the cam's protrusion rotates past the cylinder cover 111, the cylinder cover 111 is no longer under pressure and returns to its original position under the elastic force of the spring 113. At the same time, the piston 115 moves upward, causing the volume of the oil storage chamber 116 to increase and creating a negative pressure inside. Under the suction of the negative pressure, the high-temperature lubricating oil in the bearing 3 is drawn out from the oil return hole 6 and enters the heat exchange chamber 163 of the heat exchange oil box 16 through the first oil return pipe 13. In the heat exchange chamber, the lubricating oil flows over the wavy bottom plate and exchanges heat with the heat dissipation fins 169. The heat is transferred from the lubricating oil to the heat dissipation fins 169, and then conducted to the motor housing 1 through the bottom plate 167 and the coated heat dissipation silicone grease 168, and finally dissipated to the outside. The cooled lubricating oil is then drawn back into the oil storage chamber 116 through the second oil return pipe 15, completing a complete cycle.

[0052] When the motor shaft 2 is working, the noise generated enters the clamping cavity 9 and permeates into each partition 19. When the sound waves propagate inside the porous and loose sound-absorbing cotton 20, they are effectively converted into heat energy and consumed, thereby achieving a significant sound absorption and noise reduction effect.

[0053] The basic principles, main features, and advantages of the present invention have been described above. However, the above description is only a specific embodiment of the present invention, and the technical features of the present invention are not limited thereto. Any other embodiments derived by those skilled in the art without departing from the technical solution of the present invention should be covered within the patent scope of the present invention.

[0054] In the description of this invention, each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. As the apparatus disclosed in the embodiments corresponds to the methods disclosed in the embodiments, the description is relatively simple, and relevant parts can be referred to the method section.

[0055] In the description of this invention, relational terms such as "first" and "second" are used merely 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. In the description of this invention, "a plurality of" means two or more, unless otherwise expressly specified. 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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-lubricating, noise-reducing brushless motor, comprising a motor housing (1) and a motor shaft (2) rotatably connected to the motor housing (1) via a bearing (3), characterized in that: Oil inlet hole (5) and oil return hole (6) are respectively provided at opposite ends of the outer ring of the bearing (3); a cavity (4) is formed inside the motor housing (1) on the side close to the bearing (3), and an oil reservoir (11) fixed to the motor housing (1) is provided in the cavity (4). One side of the oil reservoir (11) is connected to the oil inlet hole (5) through an oil supply pipeline, and the other side is connected to the oil return hole (6) through an oil return pipeline. An oil replenishment pipe (14) penetrating the motor housing (1) is provided on the oil reservoir (11). The oil storage cylinder (11) includes a cylinder body (112) and a cylinder cover (111) elastically connected to the cylinder body (112) by a spring (113). An oil storage cavity (116) is formed between the cylinder cover (111) and the cylinder body (112). The motor shaft (2) is provided with a first sleeve (7) and a second sleeve (8) at the part located in the cavity (4) and the connection point with the motor housing (1). A pressure-applying component (10) is provided on the outside of the first sleeve (7). The pressure-applying component (10) fits against the cylinder cover (111) and repeatedly compresses the cylinder cover (111) to apply pressure to the oil storage cavity (116), so that the oil storage cylinder (11) and the bearing (3) form a circulating oil supply path through the oil supply pipeline and the oil return pipeline. The return oil pipeline includes a first connecting nozzle (117) provided on the cylinder body (112). The first connecting nozzle (117) is connected to one end of the heat exchange oil box (16) through the second return oil pipe (15). The other end of the heat exchange oil box (16) is connected to the return oil hole (6) through the first return oil pipe (13). A second check valve is provided on the second return oil pipe (15); A clamping cavity (9) with one side opening is formed between the inner side of the first sleeve (7) and the second sleeve (8) and the bearing (3). The first sleeve (7) and the second sleeve (8) are each provided with an inner cylinder (17) inside the clamping cavity (9). The inner wall of the inner cylinder is provided with several partitions (18). A partition cavity (19) is formed between two adjacent partitions (18). Each partition cavity (19) is provided with sound-absorbing cotton (20).

2. The self-lubricating noise-reducing brushless motor according to claim 1, characterized in that: The bottom of the cylinder cover (111) is provided with a pull rod (114) that is inserted into the oil storage chamber (116), and the bottom of the pull rod (114) is fixed with a piston (115) that closes the oil storage chamber (116).

3. The self-lubricating noise-reducing brushless motor according to claim 1, characterized in that: The oil supply pipeline includes a second connecting nozzle (118) provided on the cylinder body (112), and the second connecting nozzle (118) is connected to the oil supply hole (5) through the oil supply pipeline (12); The oil supply pipe (12) is equipped with a first check valve.

4. The self-lubricating noise-reducing brushless motor according to claim 1, characterized in that: The heat exchange oil box (16) includes a bottom box (161) and a box cover (162) that can be interlocked, and a heat exchange chamber (163) is formed between the box cover (162) and the bottom box (161).

5. A self-lubricating, noise-reducing brushless motor according to claim 4, characterized in that: The bottom of the base box (161) is a wave-shaped base plate formed by continuously arranged protrusions (164) and recesses (165), and an opening (166) is provided in the recesses (165). The bottom of the heat exchange oil box (16) is provided with a base plate (167) fixed to the motor housing (1). The top of the base plate (167) is provided with a number of heat dissipation fins (169). The heat dissipation fins (169) are inserted into the opening (166) and the heat dissipation fins (169) are circumferentially sealed and welded to the opening (166).

6. A self-lubricating, noise-reducing brushless motor according to claim 5, characterized in that: The bottom surface of the base plate (167) is coated with heat-dissipating silicone grease (168).

7. A self-lubricating, noise-reducing brushless motor according to claim 1, characterized in that: The cylinder body (112) is also provided with a third connecting nozzle (119) for connecting the oil replenishment pipe (14).

8. A self-lubricating, noise-reducing brushless motor according to claim 1, characterized in that: The first sleeve (7) has a stepped portion (71) for connecting to a pressure member (10), which is a cam.

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