Three-phase asynchronous motor

Abstract

The utility model relates to the field of motors, in particular to a three-phase asynchronous motor which comprises a motor shaft, a stator shell, an outer end cover, a supporting bearing and a bearing inner cover. The lubricating oil circuit comprises an oil inlet channel, an annular oil channel and an oil discharge channel; the oil throwing assembly is located in the annular oil channel and is arranged on the motor shaft in a sleeving mode so as to synchronously rotate with the motor shaft. Compared with an existing structure, by arranging the lubricating oil way and the oil throwing assembly, lubricating grease can be effectively organized and guided to enter the supporting bearing, the oil throwing assembly and the motor shaft synchronously rotate, the lubricating grease can be effectively pressed to the supporting bearing in the operation process of the motor, external oil injection is formed, and the lubricating grease is injected into the bearing through the oil throwing assembly; through non-stop oil injection and discharge, the purposes of reducing the noise of the bearing, reducing the temperature of the bearing and prolonging the service life of the bearing can be achieved, and the effects of noise reduction and explosion suppression are further achieved.

Description

Technical Field

[0001] This application relates to the field of electric motors, and more specifically, to a three-phase asynchronous electric motor. Background Technology

[0002] Three-phase asynchronous motors are a type of induction motor. Some small explosion-proof three-phase asynchronous motors use sealed bearings or traditional oil-filled bearing structures. These structures suffer from drawbacks such as high noise, high temperature, easy damage, short oil filling cycles, and easy oil leakage, leading to frequent motor shutdowns for maintenance and causing economic losses to users. The main reason for this is insufficient lubrication in the sealed bearings. However, due to the sealed bearing design, grease cannot enter the motor cavity or bearing interior, requiring shutdown and bearing replacement only when abnormal noise or temperature occurs. This not only increases maintenance costs but also directly impacts production schedules. Utility Model Content

[0003] The purpose of this application is to provide a three-phase asynchronous motor, which aims to partially or completely solve the technical problems of high noise, high temperature, easy damage and high maintenance cost of small three-phase asynchronous motors in the prior art.

[0004] To achieve this objective, the technical solution adopted in this application is as follows: a three-phase asynchronous motor is provided, including a motor shaft, a stator housing, an outer end cover connected to the side end of the stator housing, a support bearing embedded inside the outer end cover, and a bearing inner cover connected to the inner side of the outer end cover for fixing the support bearing. The stator housing, the outer end cover, the support bearing, and the bearing inner cover are all sleeved on the motor shaft. The motor further includes: a lubrication oil circuit, which includes an oil inlet channel formed at the top of the outer end cover and communicating with an oil inlet port, an annular oil passage provided in the bearing inner cover for communicating the circumferential gap between the oil inlet channel and the inner and outer rings of the support bearing, and an oil outlet channel provided in the outer end cover for communicating the circumferential gap with an oil outlet port. The oil outlet port is located at the bottom end of the outer end cover. An oil slinger assembly is located inside the annular oil passage and is sleeved on the motor shaft to rotate synchronously with the motor shaft.

[0005] In addition to one or more features described herein, or as an alternative, further embodiments of the three-phase asynchronous motor may include: the oil slinger assembly comprising an annular base interference-fitted to the motor shaft and at least two oil slinger blades disposed on a surface of the annular base facing the support bearing.

[0006] In addition to one or more features described herein, or as an alternative, a further embodiment of the three-phase asynchronous motor may include: the number of oil-throwing blades is four, and the four oil-throwing blades are equally spaced around the circumference of the ring base.

[0007] In addition to one or more features described herein, or alternatively, further embodiments of the three-phase asynchronous motor may include: the oil slinger assembly further comprising a buffer seal ring disposed on the ring base, the buffer seal ring abutting against the bearing inner cover to form a circumferential seal.

[0008] In addition to one or more features described herein, or as an alternative, a further embodiment of the three-phase asynchronous motor may include: the bearing inner cover having an annular retaining ring abutting against the outer ring end face of the supporting bearing on the side facing the supporting bearing, the annular retaining ring forming an annular inner cavity communicating with the circumferential gap, the oil slinger assembly being disposed in the annular inner cavity; an oil guide groove being formed on the surface of the bearing inner cover facing the supporting bearing, the oil guide groove penetrating the annular retaining ring and communicating with the oil inlet channel and the annular inner cavity; the oil guide groove and the annular inner cavity together forming the annular oil passage.

[0009] In addition to one or more features described herein, or as an alternative, a further embodiment of the three-phase asynchronous motor may include: the number of oil guide grooves is three, all three oil guide grooves extending radially along the inner cover of the bearing and being equally spaced on the circumference surrounding the annular retaining ring.

[0010] In addition to one or more features described herein, or as an alternative, a further embodiment of the three-phase asynchronous motor may include: the oil drain channel having an annular oil drain branch between the support bearing and the outer end cover, the annular oil drain branch having an oil baffle plate sleeved on the motor shaft, at least a portion of the oil baffle plate facing the circumferential gap.

[0011] In addition to one or more features described herein, or as an alternative, a further embodiment of the three-phase asynchronous motor may include: the oil baffle having a sleeve portion and an oil baffle portion connected to each other, the sleeve portion being fixedly mounted on the motor shaft, and the oil baffle portion being bent toward the circumferential gap and toward the outer end cover.

[0012] In addition to one or more features described herein, or as an alternative, a further embodiment of the three-phase asynchronous motor may include: the oil drain channel having an oil reservoir at the bottom end of the outer end cover, and the annular oil drain branch communicating with the oil drain port via the oil reservoir.

[0013] In addition to one or more features described herein, or as an alternative, further embodiments of the three-phase asynchronous motor may include an oil drain plate disposed at the oil drain port and used for opening and closing the oil drain port.

[0014] In addition to one or more features described herein, or alternatively, further embodiments of the three-phase asynchronous motor may include: the motor further including an oil injection rod located at the oil inlet.

[0015] One of the above technical solutions has the following advantages or beneficial effects: Compared with the existing structure, by setting up a lubrication oil circuit and an oil slinger assembly, the lubricating grease can be effectively guided into the interior of the support bearing. The oil slinger assembly rotates synchronously with the motor shaft, and during motor operation, the lubricating grease can be effectively pressed against the support bearing, forming a complete lubrication oil circuit from external oil injection, through the oil slinger assembly into the bearing, and then back to the oil drain port of the outer end cover. By injecting and draining oil without stopping the machine, the bearing noise, bearing temperature, and bearing life can be reduced. Through the above lubrication measures, the sparks or high temperatures generated by friction inside the motor can be effectively reduced, thereby avoiding the risk of explosion and achieving the effect of explosion isolation.

[0016] Other advantages of this application and the technical effects of preferred embodiments will be further described in the detailed embodiments below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a partial cross-sectional schematic diagram of a three-phase asynchronous motor provided in an embodiment of this application;

[0019] Figure 2 This is a plan view of the outer end cap provided in an embodiment of this application;

[0020] Figure 3 yes Figure 2 Schematic diagram of the cross-section of AA;

[0021] Figure 4 This is a plan view of the bearing inner cover provided in an embodiment of this application;

[0022] Figure 5 yes Figure 4 Schematic diagram of the cross-section of BB;

[0023] Figure 6 This is a plan view of the oil-slinging component provided in the embodiments of this application;

[0024] Figure 7 yes Figure 6 A cross-sectional view of the C-section.

[0025] The following are the labeling elements in the figure:

[0026] 11: Oil inlet channel; 12: Annular oil passage; 13: Oil outlet channel

[0027] 14: Oil inlet 15: Oil outlet 2: Oil slinger assembly

[0028] 21: Ring base; 22: Oil slinger blade; 23: Buffer seal ring

[0029] 3: Motor shaft; 4: Stator housing; 5: Outer end cover

[0030] 6: Support bearing; 7: Inner bearing cover; 71: Annular retaining ring.

[0031] 120: Annular inner cavity; 121: Oil guide groove; 131: Annular oil drain branch.

[0032] 8: Oil baffle plate; 81: Sleeve mounting part; 82: Oil baffle part

[0033] 132: Oil reservoir; 151: Oil drain plate; 141: Oil injection rod

[0034] 152: Sealing gasket; 153: Mounting bolt; 10: Circumferential clearance. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0037] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] Furthermore, in the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] by Figures 1 to 7 Taking this application as an example, we will explain and introduce a three-phase asynchronous motor provided in this application.

[0041] Figure 1 A partial cross-sectional schematic diagram of a three-phase asynchronous motor provided in an embodiment of this application is shown. Figure 1 As shown, this application provides a three-phase asynchronous motor, including a motor shaft 3, a stator housing 4, an outer end cover 5, a support bearing 6, and a bearing inner cover 7. The outer end cover 5 is connected to the side of the stator housing 4, the support bearing 6 is embedded inside the outer end cover 5, and the bearing inner cover 7 is connected to the inner side of the outer end cover 5 and used to fix the support bearing 6. The stator housing 4, outer end cover 5, support bearing 6, and bearing inner cover 7 are all sleeved on the motor shaft 3. The motor also includes a lubrication oil passage and an oil slinger assembly 2. The lubricating circuit includes an oil inlet channel 11 formed at the top of the outer end cover 5 and connected to the oil inlet port 14, an annular oil passage 12 provided in the bearing inner cover 7 and used to connect the oil inlet channel 11 with the circumferential gap 10 between the inner and outer rings of the supporting bearing 6, and an oil outlet channel 13 provided in the outer end cover 5 and used to connect the circumferential gap 10 with the oil outlet port 15. The oil outlet port 15 is located at the bottom end of the outer end cover 5. The oil slinger assembly 2 is located in the annular oil passage 12 and is sleeved on the motor shaft 3 to rotate synchronously with the motor shaft 3.

[0042] The outer end cover 5 can be either the front or rear end cover of the motor, without being limited to a single end; in other words, the arrangement of the lubrication oil passage and the oil slinger assembly 2 is applicable to either the front or rear end of the motor, and is not limited to one end. The oil inlet channel 11 is formed at the top of the outer end cover 5 and communicates with the oil inlet 14. This can be understood as the oil inlet 14 also being located on one side of the top of the outer end cover 5, communicating with the oil inlet channel 11 formed at the top of the outer end cover 5. Furthermore, the circumferential clearance 10 between the inner and outer rings of the supporting bearing 6 can be understood as a gap that exists between the inner and outer rings of the bearing in the circumferential direction where friction may occur, thus requiring lubrication with grease.

[0043] The oil-throwing component 2, as the name suggests, can be understood as a component that can throw out oil. It is sleeved on the motor shaft 3 and rotates synchronously with the motor shaft 3. It can promote the flow of grease in the annular oil passage 12 by throwing out oil, thereby better guiding the grease into the support bearing 6.

[0044] This application provides a three-phase asynchronous motor that, by setting up a lubrication oil circuit and an oil slinger assembly 2, can effectively organize and guide grease into the support bearing 6. The oil slinger assembly 2 rotates synchronously with the motor shaft 3, effectively pressing the grease against the support bearing 6 during motor operation. This forms a complete lubrication oil circuit where the grease is injected from the outside, passes through the oil slinger assembly 2 into the bearing, and then returns to the oil drain port 15 of the outer end cover 5. Therefore, the low-noise explosion-proof three-phase asynchronous motor proposed in this application can perform oil injection and drainage without stopping the motor, resulting in low noise and low temperature during operation, thus effectively ensuring the reliable operating time of the motor. Taking the following motor as an example, the "132 center height motor" (i.e., the center height of the motor shaft is 132mm) produced by mainstream motor manufacturers all use sealed bearings, making it impossible to inject oil during motor operation. Especially in winter when the ambient temperature is low, problems such as bearing noise and increased acceleration occur, affecting the normal operation of the motor. After implementation, this application can effectively solve the problem of "132 center high motor" being unable to be lubricated. Of course, the motors in this application are not limited to micro or small motors. As long as the motor has the above-mentioned problem of being unable to be lubricated, it can be optimized and solved by the solution proposed in this application, thereby reducing bearing noise, lowering bearing temperature, and extending bearing life, thereby improving the stability of motor operation and extending the service life of the motor. Through the above lubrication measures, the sparks or high temperatures generated by friction inside the motor can be effectively reduced, thereby avoiding the risk of explosion and achieving the effect of explosion protection.

[0045] Please refer to at least one embodiment of this application. Figure 1 , Figure 6 and Figure 7 The oil slinger assembly 2 includes an annular base 21 that is interference-fitted onto the motor shaft 3 and at least two oil slinger blades 22 disposed on the surface of the annular base 21 facing the supporting bearing 6. By installing the oil slinger assembly 2 between the bearing inner cover 7 and the supporting bearing 6, and by including the annular base 21 and at least two oil slinger blades 22, with the annular base 21 and the motor shaft 3 being interference-fitted, the assembly of the oil slinger assembly 2 is facilitated while ensuring the positional stability of the oil slinger assembly 2 on the motor shaft 3. Furthermore, this structure enables the oil slinger assembly 2 to effectively improve the fluidity of the lubricating grease.

[0046] In at least one embodiment of this application, please refer to Figure 6The number of oil-slinging blades 22 is four, and the four oil-slinging blades 22 are equally spaced on the circumference of the ring base 21. This structure is reasonably designed. By setting four oil-slinging blades 22, a certain pressure difference can be formed between the inside and outside of the oil cavity during the rotation of the oil-slinging assembly 2, thereby facilitating the flow of lubricating grease. The overall oil circuit is reasonable and smooth, which is convenient for processing, manufacturing and assembly.

[0047] Please refer to at least one embodiment of this application. Figure 1 and Figure 7 The oil-slinging assembly 2 also includes a buffer sealing ring 23 disposed on the ring base 21. The buffer sealing ring 23 abuts against the bearing inner cover 7 to form a circumferential seal. This structure can form an effective seal between the bearing inner cover 7 and the motor shaft 3, preventing lubricating grease from entering the internal sealing area of ​​the motor. The structure is reasonable. Further embodiments may include, for example... Figure 7 As shown, the ring base 21 can be bent to form an annular groove, and the buffer sealing ring 23 can be fitted inside the annular groove and contact and abut against the bearing inner cover 7 through the abutting part extending from the inside of the annular groove.

[0048] Please refer to at least one embodiment of this application. Figure 1 , Figure 4 and Figure 5 The bearing inner cover 7 has an annular retaining ring 71 on the side facing the supporting bearing 6, which abuts against the outer ring end face of the supporting bearing 6. The annular retaining ring 71 is used to fix and protect the supporting bearing 6. The annular retaining ring 71 encloses and forms an annular inner cavity 120 that communicates with the circumferential gap 10, and the oil slinger assembly 2 is disposed in the annular inner cavity 120. An oil guide groove 121 is formed on the surface of the bearing inner cover 7 facing the supporting bearing 6. The oil guide groove 121 passes through the annular retaining ring 71 and communicates with the oil inlet channel 11 and the annular inner cavity 120. The oil guide groove 121 and the annular inner cavity 120 together form an annular oil passage 12. Referring to the accompanying drawings, it can be understood that one of the oil guide grooves 121 on the inner cover 7 of the bearing can be connected at one end to the oil outlet hole of the oil inlet channel 11 on the outer end cover 5, and at the other end to the annular inner cavity 120, thereby connecting the oil inlet channel 11 and the annular inner cavity 120; furthermore, the other end of the aforementioned oil guide groove 121 can also correspond to the cage position of the bearing 6 to quickly guide the grease into the circumferential gap 10 of the bearing 6.

[0049] In at least one embodiment of this application, such as Figure 4As shown, there are three oil guide grooves 121. All three grooves extend radially along the inner bearing cover 7 and are evenly spaced around the circumference of the annular retaining ring 71. By providing three oil guide grooves 121, processing is convenient, facilitating alignment and installation between the inner bearing cover 7 and the outer end cover 5. Furthermore, it ensures the structural strength of the annular retaining ring 71 and improves the structural stability of the inner bearing cover 7 during the processing and use of the oil guide grooves 121. Optionally, the cross-sectional shape of all three oil guide grooves 121 can be set to the shape of a waist-shaped hole, which is convenient to process, reasonably positioned, and effectively connects the oil inlet channel 11 and the annular inner cavity 120.

[0050] In at least one embodiment of this application, please refer to Figure 1 The oil drain channel 13 has an annular oil drain branch 131 between the support bearing 6 and the outer end cover 5. An oil baffle 8 is provided in the annular oil drain branch 131, and the oil baffle 8 is sleeved on the motor shaft 3, with at least a portion of the oil baffle 8 facing the circumferential clearance 10. By placing the oil baffle 8 between the outer end cover 5 and the support bearing 6, grease can be effectively stored between the bearing rolling elements and the cage of the support bearing 6, extending the lubrication cycle. To overcome the problem of grease not being able to make good contact with the support bearing 6, this structure has a larger oil cavity inside the outer end cover 5, which can store a larger amount of grease compared to existing structures, thereby improving the lubrication of the support bearing 6.

[0051] Please refer to at least one embodiment of this application. Figures 1 to 3 The oil baffle 8 has a sleeve portion 81 and an oil-blocking portion 82 connected to each other. The sleeve portion 81 is fixedly mounted on the motor shaft 3, and the oil-blocking portion 82 is bent towards the outer end cover 5, facing the circumferential gap 10. This structure of the oil baffle 8 allows it to be stably mounted on the motor shaft 3. Furthermore, the bending of the oil-blocking portion 82 towards the outer end cover 5, facing the circumferential gap 10, also allows grease to be stored at the bend of the oil-blocking portion 82, thereby effectively storing the grease between the bearing rolling elements and the cage supporting the bearing 6, extending the lubrication cycle.

[0052] In at least one embodiment of this application, please refer to Figure 1 and Figure 3 The oil drain channel 13 has an oil storage chamber 132 at the bottom of the outer end cover 5. The annular oil drain branch 131 is connected to the oil drain port 15 through the oil storage chamber 132. This structure allows the oil drain channel 13 to have a certain oil storage capacity, thereby enabling the amount of oil injected from the oil inlet 14 to have a certain elastic and controllable range. The structure is reasonably designed.

[0053] Please refer to at least one embodiment of this application. Figure 1 and Figure 2The motor also includes an oil drain plate 151 located at the oil drain port 15 and used for opening and closing the oil drain port 15. By providing a larger oil drain port 15 at the bottom of the motor that communicates with the oil storage chamber 132, the oil draining efficiency is improved; by providing the oil drain plate 151, oil can be drained during motor operation when the oil drain plate 151 is opened; further optionally, the oil drain plate 151 and the oil drain port 15 can be sealed by a sealing gasket 152, and the oil drain plate 151 can also be fixed to the oil drain port 15 by mounting bolts 153.

[0054] Please refer to at least one embodiment of this application. Figure 1 and Figure 2 The motor also includes an oil injection rod 141 located at the oil inlet 14 for easy external oil injection.

[0055] In summary, the installation of the low-noise explosion-proof three-phase asynchronous motor proposed in this application can generally include: fixing the front and rear covers to the front and rear ends of the stator housing 4 with bolts; supporting the rotor with two front and rear support bearings 6; installing the oil slinger assembly 2 onto the motor shaft 3 using tooling; installing the support bearings 6 into the front and rear covers respectively; aligning the oil guide grooves 121 of the two bearing inner covers 7 with the oil outlet holes of the oil inlet channels 11 of the front and rear covers respectively; installing the two oil baffles 8 respectively; connecting the front and rear covers with bolts to fix the support bearings 6; installing oil drain plates 151 and sealing gaskets 152 at the bottom oil drain ports 15 of the front and rear covers respectively; and finally installing the fan, fan cover, and junction box.

[0056] When a low-noise, explosion-proof three-phase asynchronous motor requires lubrication during operation, it can be operated without stopping the machine. Lubricant is simply injected externally through the lubrication rod 141. The grease flows through the inlet channel 11 and the annular oil passage 12, into the front and rear support bearings 6, and then returns to the drain channels 13 at the bottom of the front and rear covers. During draining, the drain plates 151 at the bottom of the front and rear covers can be removed without stopping the machine. This structure, with the inclusion of the oil-throwing component 2, better seals the motor shaft 3 and the bearing inner cover 7, ensuring a tight seal between the lubrication circuit and the motor's interior. This motor is low-noise, explosion-proof, structurally sound, and suitable for a wide range of applications.

[0057] Obviously, the above embodiments of this application are merely examples for clear illustration and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A three-phase asynchronous motor, comprising a motor shaft, a stator housing, an outer end cover connected to a side end of the stator housing, a support bearing embedded inside the outer end cover, and a bearing inner cover connected to the inner side of the outer end cover for fixing the support bearing, wherein the stator housing, the outer end cover, the support bearing, and the bearing inner cover are all sleeved on the motor shaft, characterized in that, The electric motor also includes: The lubrication circuit includes an oil inlet channel formed at the top of the outer end cover and connected to the oil inlet port, an annular oil passage provided in the inner cover of the bearing and used to connect the oil inlet channel with the circumferential gap between the inner and outer rings of the supporting bearing, and an oil outlet channel provided in the outer end cover and used to connect the circumferential gap with the oil outlet port, wherein the oil outlet port is located at the bottom end of the outer end cover. The oil-slinging component is located inside the annular oil passage and is sleeved on the motor shaft to rotate synchronously with the motor shaft.

2. The electric motor according to claim 1, characterized in that, The oil-throwing assembly includes an annular base that is interference-fitted onto the motor shaft and at least two oil-throwing blades disposed on the surface of the annular base facing the support bearing.

3. The electric motor according to claim 2, characterized in that, The number of oil-throwing blades is four, and the four oil-throwing blades are equally spaced around the circumference of the ring base.

4. The electric motor according to claim 2, characterized in that, The oil-slinging assembly also includes a buffer sealing ring disposed on the ring base, the buffer sealing ring abutting against the bearing inner cover to form a circumferential seal.

5. The electric motor according to any one of claims 1-4, characterized in that, The bearing inner cover has an annular retaining ring on the side facing the supporting bearing, which abuts against the outer ring end face of the supporting bearing. The annular retaining ring encloses and forms an annular inner cavity communicating with the circumferential gap. The oil slinger assembly is disposed in the annular inner cavity. An oil guide groove is formed on the surface of the bearing inner cover facing the supporting bearing. The oil guide groove passes through the annular retaining ring and communicates with the oil inlet channel and the annular inner cavity. The oil guide groove and the annular inner cavity together constitute the annular oil passage.

6. The electric motor according to claim 5, characterized in that, The number of oil guide grooves is three, and all three oil guide grooves extend radially along the inner cover of the bearing and are equally spaced on the circumference surrounding the annular retaining ring.

7. The electric motor according to any one of claims 1-4, characterized in that, The oil drain channel has an annular oil drain branch between the support bearing and the outer end cover. An oil baffle is provided in the annular oil drain branch. The oil baffle is sleeved on the motor shaft, and at least part of the oil baffle is facing the circumferential gap.

8. The electric motor according to claim 7, characterized in that, The oil baffle has a sleeve portion and an oil baffle portion connected to each other. The sleeve portion is fixedly installed on the motor shaft, and the oil baffle portion is facing the circumferential gap and bent toward the outer end cover.

9. The electric motor according to claim 7, characterized in that, The oil drain channel has an oil storage cavity at the bottom end of the outer end cover, and the annular oil drain branch is connected to the oil drain port via the oil storage cavity.

10. The electric motor according to any one of claims 1-4, characterized in that, The motor further includes an oil drain plate disposed at the oil drain port for opening and closing the oil drain port; and / or, the motor further includes an oil injection rod disposed at the oil inlet port.

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